FIELD OF TECHNOLOGY 
       [0001]    This invention is related to water supply system for differently supplying drinkable, service and recycled water, especially is related to equipment of supply pipe for quality-distinguished water supply. 
       TECHNICAL BACKGROUND 
       [0002]    Water is the source of life, without which human beings can not live. Due to global warming, the increasing population in the world, the development of industry and the environmental pollution, potable water resource is running out and there is a ‘water crisis’ in the world. 
         [0003]    Water in our daily life is supplied in this way: the tap water plant purifies the source water and through supply pipe transfers the tap water to pressure-regulating tower to supply water, from where tap water is allocated to water-supply pipe network in residency areas for daily use of the residents. When the pressure regulating tower for water-supply pressures the tap water and supplies to every unit, the water-supply pipe network may contaminate the tap water for the second time. In recent years with the development of world economy, human beings pay more attention to and have higher requirement of the sanitation and environment. People want to have drinkable water of high quality. As a result, domestic water filter, bottled water and electrolyzed purified water appear in the market. But these water products are expensive and difficult to use so that only a small number of families use them, while most people can not. The domestic water filter is easy to be blocked and hard to clean. 
         [0004]    In our new water-supply system with pressure regulation for drinkable, service water, the water plant does not directly supply drinkable water at the initiating terminal after routine processing but delivers domestic water to the ending terminal while the forestage of our system, where drinkable, service water with desired standard is supplied to users after further processing. If the resource water or the water at the initiating terminal was polluted, the processing at the ending terminal while the forestage of our system could be a temporary solution against pollution. 
         [0005]    Central processing of water for different quality as drinkable, service water can solve the problem of safety and sanitation of drinkable water for human and livestock in towns and remote rural mountainous areas with scattered population in the world. Because central processing of water for different quality as drinkable, service and recycled water can provide safe and sanitary water, develop water-supply system further and economically, it will be more popular. Economical exploitation and using water resource is for all living human and benefits economic development and health of human. 
       SUMMARY OF THE INVENTION 
       [0006]    This invention provides a water-supply multi-pipe system with accessories for quality-distinguished distribution of domestic water. This pipe contains three pipes arranged in a triangular combination to supply drinkable water, service water and recycled water at the same time. The diameter and thickness of the pipe walls of the three pipes depend on required water-supply volume and pressure. 
         [0007]    The accessories, including triangle-shaped straight pipe, straight joint, 90-175 degree bending joint, tee joint and pipe clip are all made of contamination-free material, which can be assembled into a multi-pipe delivering system for separate supply of different domestic water to users. 
         [0008]    This three-in-one pipe system reduces manufacturing costs and provides good heat insulation to save energy. It is also easy for installation and maintenance. 
         [0009]    This invention teaches a pressure-stabilized multi-pipe system for quality-distinguished supply of water, including water processing equipment, pipes valves, meters and pipe network, wherein said pipe system comprises three pipes arranged with a cross section having three circles adjacent to each other to form a triangular positioned multi-pipe system; a “Y” shaped inserting board with arc surfaces matching a part of external perimeters of said three pipes separating said three pipes and accommodation said three pipes into multi-pipe system; where said pipes are made in contamination-free materials with diameter or size and thickness of walls vary depend on water-supply volume and pressure according to national standard modulus; by which source water can be separately distributed as drinkable water, service water and recycled water. 
         [0010]    The system may further comprise a triangle-shaped straight joint, 90-175 degree bending joint and tee joint to connect main pipes and shunt pipes into a pipe network. The triangle-shaped straight joint, 90-175 degree bending joint and tee joint comprise three inner tunnels matching the size of said three pipes, arc surface as external walls; and a “Y”-shaped middle insulation part with streamlined ends flushed with said arc surface of external walls; where said three inner tunnels each having close fit socket-and-spigot ends with a cut-off step having similar thickness as of the walls of said three pipes at inner side of the external walls to make it easy to insert said three pipe at same depth into to the joints. 
         [0011]    A preferred embodiment of the three-in-one multi-pipe system further comprises a Y-shaped slot is provided at an end of said “Y” inserting board of said three pipes; and a Y-shaped protruding flange is provided at an end of said joints; where said Y-shaped flange can mate with said Y-shaped slot to prevent water leaking. 
         [0012]    The 90-175 degree bending joint is either sideway bending to left or right with respect to one of said three pipes, or headway bending outward or inward with respect to one of said three-in-one pipes. 
         [0013]    The three-in-one multi-pipe system may further comprise plastic foam cover as heat insulation layer covering said three pipes and joints; and a 36V power heating membrane underneath the heat insulation layer to heat up said pipes and joints. 
         [0014]    The three-in-one pipes can be straight pipes or coiled pipes and these pipes, the inserting board, and the joints are fixed together by means of bonding, sealing and wiring together to form a pressure-stabilized multi-pipe system. 
         [0015]    The three-in-one multi-pipe system may further comprise a triangular shaped pipe clip for fixation, which includes a plastic or stainless steed strap with a fixed lower part and a bendable upper part having a length enough to wrap around said three pipes; one or more bolts provided on said fixed part of said strap to attach to a building; a fixing mean on said bendable upper part of said strap; and one or more plastic plates having two grooves with a shape matching external surfaces at one side of said triangular-positioned multi-pipe system; wherein said plastic plate is bonded to the fixed lower part of said strap so that said three pipes can be held in position by wrapping said upper bendable part around said pipes and fastening by said fixing mean with lower fixed part of said strap. 
         [0016]    Based on the needs of a municipal water system, a multi-pipe water-supply system can be built up with two pipes, which further includes a “I” shaped inserting board separating said two pipes, a triangle-shaped straight joint, a 90-175 degree bending joint, a tee joint for connecting main pipes and shunt pipes into a pipe network, and a pipe clip for fixing the multi-pipe system to a building or a structure, by which source water can be separately distributed as drinkable water and service water. 
     
     
       DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is schematic illustration of the three-in-one triangle-shaped water-supply straight pipe for drinkable, service and recycled water.  FIG. 1  shows a side view of the straight pipe. 
           [0018]      FIG. 2  is schematic illustration of the straight joint of the three-in-one triangle-shaped water-supply pipe for drinkable, service and recycled water.  FIG. 2  shows a side view of the straight joint. 
           [0019]      FIG. 3  is schematic illustration of the tee joint of the three-in-one triangle-shaped water-supply pipe for drinkable, service and recycled water.  FIG. 3-A  is a side view of the tee joint.  FIG. 3-B  is a section view of the tee joint along the center of each side pipe of the joint. 
           [0020]      FIG. 4  is schematic illustration of the 90-175 degree bending joint of the three-in-one triangle-shaped water-supply pipe for drinkable, service and recycled water.  FIG. 4-1A  is a front illustration of the joint with pipes bending to left or right.  FIG. 4-2A  is a front illustration of the joint with pipes bending vertically outward.  FIG. 4-3A  is a front illustration of the joint with pipes bending vertically inward. FIG.  4 - 1 B- 4 - 3 B are their respective side views. 
           [0021]      FIG. 5  is schematic illustration of the pipe clip or clamp of the three-in-one triangle-shaped water-supply pipe for drinkable, service and recycled water.  FIG. 5-A  illustrates an illustration of the pipe clip in use.  FIG. 5-B  is a side view illustration of the pipe clip. 
           [0022]      FIG. 6  is schematic illustration of the heat insulation and heating up layer around the external side of the three-in-one triangle-shaped water-supply pipe for drinkable, service and recycled water. 
       
    
    
     DETAILED DESCRIPTION 
       [0023]    The goal of this invention is to provide a three-in-one water-supply pipe with accessories for drinkable, service and recycled water. It is cold water supply pipe with accessories suitable for water system to supply domestic water by integrating three pipes into one pipe. It is easy for network of multi-pipe to bond to piping shaft or attachment of resident building. The three-in-one cold water pipe can supply three kinds of water at the same time and has a good result of heat insulation. It is easy for installation and maintenance to make the pipe network beautiful and clear. The safety and sanitation of the domestic water are guaranteed. 
         [0024]    The goal of this invention is achieved by following embodiments. 
         [0025]    It provides a kind of water system can store water with pressure regulating and supply drinkable, service and recycled water. In the system, the water from source is processed into domestic water and transmitted to the ending terminal while the forestage of the system where water is processed into drinkable, service and recycled water supplied by multi-pipes. The system includes water processing equipment, pipes valves, meters and water-supply network. The characteristic of the three-in-one pipe for drinkable, service and recycled water is that the pipe is made of second contamination free material for cold water supply, which can also be used to supply three other liquids of normal temperature that do not erode the pipe. 
         [0026]    There are two kinds of pipe as straight and coiled pipe whose section is three circles adjacent to each other to form a triangle. The diameter and thickness of pipe wall and length of the pipe depend on water-supply volume and pressure and installation according to national standard. 
         [0027]    A further embodiment includes that the straight pipe and shunt pipe are connected by the triangle-shaped straight joint, 90-175 bending joint and tee joint to compose the pipe network that is fixed onto attachment of buildings by accessory triangle-shaped pipe clips. 
         [0028]    The triangle-shaped straight joint, 90-175 bending joint and tee joint are close fit socket-and-spigot joints whose internal diameter is larger than the external diameter of the triangle-shaped straight pipe. The shape of external side of the joints is circle arc. “Y”-shaped socket-and-spigot board to separate water is in the middle of the joints. The board is streamlined with thickness from thin to thick. The inner side of the joints has bench with the same thickness of straight pipe wall, which make it easy to insert straight pipe at same depth to connect to the joints. 
         [0029]    The straight water-supply pipe matching the triangle-shaped straight joint, 90-175 bending joint and tee joint further includes that at the end of the triangle-shaped pipe that needs to be connected, the overlapping internal side of the three pipes is sawed into Y-shaped socket with special tools to match the spigot streamlined board in the triangle-shaped joint. The socket and spigot is connected by bonding or sealing, which prevents small pore, water leaking and mixing in the pipe network. 
         [0030]    The 90-175 bending joint can be in one of three types such as bending to left or right, bending vertically outward and inward for all standards. 
         [0031]    The triangle-shaped pipe clip is composed of plastic or stainless steed strap and plastic plate and has the shaped matching external side of triangle-shaped straight pipe. The plate with double sockets and movable clamp bonds to stainless steel strap and is fixed to the attachment of building with the bolts in the middle of it. The stainless steel strap with bendable upper part has open sockets in the middle to place two plastic boards that are adjacent to the external side of straight pipe. The front end of strap is inserted in the movable clamp of the plate and is fastened by trimming screw rod. 
         [0032]    The three-in-one water-supply pipe network may further include triangle-shaped straight joints, 90-175 bending joint and tee joint for standard straight pipe and straight joint, bending joint, wire joint, variant-diameter joint, plug, meter, valve and tap made of second contamination free material in the market. They are connected by means of bonding, sealing and wire to compose the water-supply multi-pipes network for separated delivery of drinkable, service and recycled water. 
         [0033]    The water-supply multi-pipes may also have plastic foam as heat insulation layer around the external side. In order to prevent frost in north areas, there is 36V power heating membrane underneath the heat insulation layer to heat up. 
         [0034]    This invention of three-in-one water-supply pipe can also be used to supply three other liquids of normal temperature that do not erode the pipe. There are two kinds of pipe as straight and coiled pipe whose section is three circles adjacent to each other to form a triangle. The diameter and thickness of pipe wall and length of the pipe depend on water-supply volume and pressure and installation according to national standard. 
         [0035]    Usually the diameter of pipe is 15 mm, 20 mm, 30 mm, 40 mm, 50-100 mm. The length of straight pipe is 6 m, 12 m and the length of coiled pipe is 50 m, 100 m or dependent on project requirement. 
         [0036]    For the three-in-one water-supply pipe for drinkable, service water described above, the straight pipe and shunt pipe are connected by the triangle-shaped straight joint, 90-175 bending joint and tee joint to compose the pipe network that is fixed onto piping shaft or attachment of buildings by accessory triangle-shaped pipe clips. 
         [0037]    The 90-175 bending joint described above has four directions with respect to a standing with drinking water pipe facing out, such as sideway bending to left and right, bending outward and inward, all with different sizes. 
         [0038]    The triangle-shaped straight joint, bending joint and tee joint described above are close fit socket-and-spigot joints whose internal diameter is larger than the external diameter of the triangle-shaped straight pipe. The shaped of external side of the joints is three circle arcs connecting to each other. “Y”-shaped socket-and-spigot board to separate water is in the middle of the joints. 
         [0039]    “Y”-shaped socket-and-spigot board described above has its thickness streamlined from thin to thick. The inner side of the joints has bench with the same thickness of straight pipe wall, which make it easy to insert straight pipe at same depth to connect to the joints. 
         [0040]    For the straight water-supply pipe matching the triangle-shaped straight joint, 90-175 bending joint and tee joint described above, at one end of the triangle-shaped pipe that needs to be connected, the overlapping internal side of the three pipes is sawed into Y-shaped socket with special tools to match the spigot streamlined board in the triangle-shaped joint. 
         [0041]    The socket and spigot is connected by bonding or sealing, which prevents small pore and bubbler water leaking and mixing in the pipe network. 
         [0042]    The triangle-shaped pipe clip described above is composed of plastic or stainless steed strap and plastic plate and has the shape matching external side of triangle-shaped straight pipe. The plate with double sockets and movable clamp bonds to stainless steel strap and is fixed to the attachment of a building with bolts in the middle of it. The stainless steel strap with bendable upper part has open sockets in the middle to place two plastic boards that are adjacent to the external side of straight pipe. The front end of the strap is inserted in the movable clamp of the plate and is secured by turning a screw rod. The size of pipe clip matches the triangle-shaped pipe. 
         [0043]    The three-in-one water-supply pipe network for drinkable service water described above has characteristics that the triangle-shaped straight joint, 90-175 bending joint and tee joint are suitable for standard straight pipe and straight joint, bending joint, wire joint, variant-diameter joint, plug, meter, valve and tap made of second contamination free material in the market. They are connected by means of bonding, sealing or wiring to constitute the multi-pipe water-supply network. 
         [0044]    To insulate and heat up the water-supply network of multi-pipe for different domestic water delivery described above, it has plastic foam as heat insulation layer around the external side. In order to prevent frost in north areas, there is 36V power heating membrane underneath the heat insulation layer to heat up. 
         [0045]    In particular, referring to  FIGS. 1 and 2  for the three-in-one water-supply pipe for drinkable, domestic and recycled water and its accessories. The triangle-shaped straight pipe, straight joint, 90-175 bending joint are connected by “Y”-shaped socket and spigot by means of bonding or sealing as pipeline. 
         [0046]    The pipeline described above is suitable for standard straight pipe and straight joint, bending joint, wire joint, variant-diameter joint, plug, meter, valve and tap made of second contamination free material in the market. They are connected by means of bonding, sealing and wire to compose the water-supply network of multi-pipe for three types of water:
       1. Drinkable water: process the water supplied by water plant at the initiating terminal to meet the GB5749-2006 standard of high quality drinkable water at the end terminal while the forestage of our water-supply system for the users as drinkable water.   2. Domestic water: process the water supplied by water plant at the initiating terminal as the water with quality inferior to drinkable water at the end terminal while the forestage of our water-supply system for the users as domestic water.   3. Recycling water: recycle the sewage water and rain water to meet some standard and use recycled water bump to transfer to users through the recycled water pipeline. The recycled water can be used to clean toilet, water flowers and for fountains in the garden       
 
         [0050]    The water-supply pipe with accessories for drinkable service and recycled water and the integrated three-in-one water-supply pipeline and network can be used with the “water-supply system and multi-functional supply tank” disclosed in the international patent application PCT/CN02/0034 and U.S. Pat. No. 7,163,619. Using the pipe system of this invention, the water plant does not directly supply drinkable water at the initiating terminal after routine processing but delivers domestic water to the ending terminal while the forestage of our system, where drinkable, service water with desired standard is supplied to users after further processing. 
         [0051]    If the resource water or the water at the initiating terminal was polluted, the processing at the ending terminal while the forestage of our system could be a temporary solution against pollution. It not only meets the new published national standard GB5749-2006 for drinkable water but also achieves the goal to provide safe and sanitary water and save the energy and economically exploit water resource to benefit mankind. 
       EXAMPLES 
       [0052]    The invention will be further illustrated in accordance with the following practical embodiments, which are used only for the illustrations and cannot be taken as limiting the scope of the present invention. 
       Example 1 
       [0053]    Referring to  FIG. 1  and  FIG. 2 , the Three-in-one triangle-shaped water-supply pipe  1  for drinkable, service and recycled water is composed of pipe hole  2  and pipe wall  5  for drinkable water and pipe hole  3  and pipe wall  7  for domestic water and pipe hole  4  and pipe wall  6  for recycled water, which has a triangle shaped. When to connect pipes, “Y”-shaped sockets  8 , 9 , 10  are sawed by special tools at one end of straight pipe whose width and depth is larger than the water-separating board  11 , 12 , 13  in the straight joint by 0.5 cm. When bond the joint to straight pipes, make the adjacent surfaces rough by fine abrasive cloth and brush special glue on the surfaces. Insert straight pipe wall  5 ,  6 ,  7  into joint pipe wall  14 ,  16 ,  15  and make it close fit with lower bench  17 ,  18 ,  19  in the external side of joint. At the same time, insert water-separating spigot board  12 , 11 , 13  into sockets  8 , 9 , 10  and make it close fit to guarantee that the seam is filled by glue without bubble and small pore. After it is dry, test with water to check whether water will leak. 
         [0054]    When joint bending to left or right is needed, refer to  FIG. 4-LA ,  FIG. 4-1B  for 90-175 bending joint. When joint bending vertically outward is needed, refer to  FIG. 4-2A ,  FIG. 4-2B  for 90-175 bending joint. When joint bending vertically inward is needed, refer to  FIG. 4-3A ,  FIG. 4-3B  for 90-175 bending joint. When shunt is needed for triangle-shaped straight pipe, refer to  FIGS. 3-A  and  3 -B for tee joints. Connect the external thread interface  20 ,  21 ,  22  of tee joint with the independent internal thread joint, then connect the standard pipe available in the market and add valve, meter and tap to supply water for the user. 
         [0055]    Referring to  FIG. 5 , the pipe clip to fix the triangle-shaped three-in-one water-supply pipe on the piping shaft or attachment of the building, plastic plate  23  bonds to stainless steel strap  24  and has a hole in the middle to fix pipe clip on the piping shaft or attachment of the building with bolt  26 . The plastic plate of pipe clip has a hole  27  for trimming screw rod and a socket  28  for clamp. Socket  29  is in the middle of upper part of stainless steel strap  24 . There are two movable plastic boards  25  to fix pipe in the sockets. Stainless steel strap bonding on plastic plate  23  surrounds the triangle-shaped pipe and is tensed from clamp socket  28  and fixed by trimming screw rod  27 . 
         [0056]    After the water-supply network of multi-pipe for drinkable, service water is installed, refer to  FIG. 6  to set up heat insulation and hearting up layer consisting power heating layer, heat insulation foam concrete  31 , Cystosepiment  32  and reflector for heat insulation  33 . Power heating membrane layer is composed of insulation membrane conducting heat  34 , 36V power heating plate  35  and insulation membrane  36 . Power heating layer is connected with the switch of a temperature-sensed relay.
This invention provides a three-in-one water-supply pipe with accessories for quality-distinguished distribution of domestic water. This pipe contains three pipes arranged in a triangular combination to supply drinkable water, service water and recycled water at the same time. The diameter and thickness of the pipe walls of the three pipes depend on required water-supply volume and pressure. The accessories, including triangle shaped straight pipe, straight joint, 90-175 degree bending joint, tee joint and pipe clip are all made of contamination-free material, which can be assembled into a multi-pipe delivering system for separate supply of different domestic water to users. This three-in-one pipe system reduces manufacturing costs and provides good heat insulation to save energy. It is also easy for installation and maintenance.