JP4447965B2 - Directly connected water supply system - Google Patents

Description

  The present invention relates to a directly connected water supply apparatus that is connected to, for example, a water main and supplies water to each door.

The water supply system that supplies tap water for mains used in condominiums and apartments
Since the supply pressure of the water main is regulated, if the usage amount increases, the water supply amount may not catch up and the water supply capacity may be insufficient. Therefore, in a condominium or apartment water supply system, a directly connected water supply apparatus is employed to avoid such a situation.

  Normally, a direct-connection water supply system is equipped with a pump unit in the pipe from the water main to each household, and when the pressure or flow rate of the water main is insufficient, the pressure is increased by operating the pump unit to compensate for it. Let the water supply.

  By the way, a directly connected water supply apparatus has a structure which supplies water directly from a water main, and there exists a possibility that a tap water may flow backward to a water main. Therefore, in the direct connection type water supply apparatus, a backflow prevention circuit is provided in a part of the pipe of the water supply apparatus to prevent backflow of tap water to the water main.

  Usually, the backflow prevention circuit has a structure in which a backflow prevention device having the same diameter as that of the pump unit is provided in a part of the piping of the water supply device, for example, a piping member on the suction side or the discharge side.

  However, since there is only one backflow prevention device, there is a problem that when the backflow prevention device is periodically inspected, the inspection work cannot be performed unless the water flow is stopped, and the water must be cut off.

  Therefore, the backflow prevention circuit employs a structure in which two backflow prevention devices having the same diameter as that of the pump unit are connected in parallel. When checking one backflow prevention device, the remaining backflow prevention device A backflow prevention function is secured to avoid water interruptions associated with inspection work.

  By the way, the direct connection type water supply apparatus is required to be as compact as possible as a whole because of restrictions on the installation location. This tendency is particularly strong in the package type in which the pump unit and the backflow prevention circuit are housed in the same cabinet.

  However, if two sets of the same diameter as the diameter of the pump unit are provided, the outer dimensions of the backflow prevention circuit are considerably increased, and it is difficult to keep the entire water supply device compact. In addition, the larger the diameter of the backflow prevention device, the larger the outer dimensions and the larger the occupied space, so that it is easy to impair the overall compactness of the water supply device.

  In particular, in a package type in which various components are mounted in a limited space, it is difficult to secure a sufficient space, and there is a problem that the package must be enlarged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a directly connected water supply device that enables the check of a backflow prevention device that reduces the burden on the consumer while reducing the size of the backflow prevention circuit.

The invention described in claim 1 is a cabinet having a vertical box shape whose left-right direction is longer than the depth, and a plurality of cabinets provided in the cabinet , the discharge holes being provided on the front side of the cabinet on the side surface . An electric motor provided above each of the pump and the plurality of pumps, and the plurality of pumps are directly connected to output shafts of the electric motors with the suction holes facing downward, respectively, The pump is connected to the upper back side of the cabinet and in parallel in the left-right direction, and the suction holes of the plurality of pumps, and is connected to the inside of the cabinet and below the plurality of pumps. A first backflow prevention device that is disposed on a side of the pump unit and has the same diameter as that of the pump unit, the cabinet, and the plurality of ports. Disposed on the lower side of the flop, with grapple in parallel to the first backflow prevention device, a second backflow prevention device formed to a smaller diameter than the diameter of the pump unit, provided in the cabinet, the pump A suction side merging pipe connected to the suction hole of the pump, which is directly below the unit and extends in the left-right direction, and one end of the merging pipe is provided in the cabinet. A relay pipe that is bent in a U-shape toward the front obliquely lower side of the merging pipe on the suction side and formed in the same diameter as the diameter of the pump, and provided in the cabinet An L-shaped discharge pipe facing the lower side of the same diameter as the pump connected to each of the discharge holes, a front portion directly below the water supply pump in the cabinet, and an upper side of the first backflow prevention device. Established, Serial and discharge pipe connected to said confluence of the right and left directions extending discharge side pipe, wherein the first backflow prevention device, in the cabinet, and the left and right to the front oblique lower side of the suction side of the merging pipe The second backflow prevention device is arranged to extend in the left-right direction in the cabinet and below the merging pipe .

According to a second aspect of the present invention, a first on-off valve having the same diameter as that of the pump unit is provided on a primary side and a secondary side of the first backflow prevention device, respectively, and the second backflow prevention device is provided. Each of the primary side and the secondary side is provided with a second opening / closing valve having a small diameter according to the diameter of the second backflow prevention device.

Conversely flow prevention circuit than the backflow prevention device of the pump unit of the same caliber plurality of sets, the structure used, only a small external dimensions. Moreover, if a time zone with a small amount of water supply is selected and the reverse flow prevention device having the same diameter as that of the pump unit is inspected, the burden on the customer such as water outage can be avoided.

  Therefore, the backflow prevention circuit can be made compact, and the inspection of the backflow prevention device can be performed while suppressing the burden on the consumer.

Et without compromising the compactness of the backflow prevention circuit is, it is possible to stop the water flow in the required locations.

It is possible to obtain a compact package type directly-connected water supply device that takes advantage of the features of the small- diameter backflow prevention device.

[First Embodiment]
Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.

  FIG. 1 is a front view of, for example, a package type directly connected water supply apparatus, FIG. 2 is a right side view of the apparatus, and FIG. 3 is a front view along the line AA in FIG. FIG. 4 is a cross-sectional view, and FIG. 4 is a cross-sectional plan view taken along the line BB in FIG. 2. In FIG. 1, 1 indicates a box-shaped cabinet. The cabinet 1 has a vertical box shape that is elongated in the left-right direction and extremely short in depth. Reference numeral 2 denotes a frame that forms the skeleton of the cabinet 1, and 3 denotes a plate-like cover member (only a part of which is shown) that forms the wall surface of each part of the cabinet 1.

  A pump unit 5 is disposed on the upper back side of the cabinet 1. The pump unit 5 includes a vertical water supply pump 6 that is installed in parallel in the left-right width direction, for example. Each of these water supply pumps 6 has, for example, an electric motor 7 on the upper side and a multistage turbine pump 8 directly connected to an output shaft (not shown) of the motor 7 on the lower side. All of these turbine pumps 8 are installed in the cabinet 1 so that the upper discharge hole (not shown) faces the front and the lower suction hole (not shown) faces downward.

  As shown in FIGS. 2 and 3, the suction holes of these turbine pumps 8 are arranged in the left-right direction disposed directly below the turbine pump 8 via the maintenance on-off valve 10 having the same diameter as the turbine pump 8. It is connected to the extending confluence pipe 11 on the suction side. As shown in FIGS. 1 and 2, each of the discharge holes of each turbine pump 8 has an L-shaped discharge pipe 12 (with a built-in check valve) facing the lower side of the same diameter as the turbine pump 8 and a maintenance on-off valve. 14 is connected to a confluence pipe 15 on the discharge side, which is disposed in front of the turbine pump 8 and extends in the left-right direction.

  Thus, the pump unit 5 is formed in which the right end of the merging pipe 11 is a suction part and the left end of the merging pipe 15 is a discharge part.

  Among these, the discharge part of the confluence | merging pipe | tube 15 (discharge side) is connected to the connection pipe | tube 16 penetrated and provided in the upper stage side of the left side wall of the cabinet 1. FIG. A discharge port 17 for connecting a water supply pipe that can be connected to a water supply pipe (not shown) facing each household is formed at the tip of the connecting pipe 16 protruding outside the cabinet 1. An accumulator 18 for supplementing water supply is connected to a part of the junction pipe 15.

  A relay pipe 20 having the same diameter as the pump diameter is connected to the suction portion of the junction pipe 11 (suction side). As shown in FIG. 2, the relay pipe 20 is bent into a substantially U shape, for example, toward the front obliquely lower side. Between the end of the relay pipe 20 facing the lower center side of the cabinet 1 and the connecting pipe 23 penetrating the lower stage side of the left side wall of the cabinet 1, the lower space of the cabinet 1 is utilized to form a parallel type. A backflow prevention circuit 22 is provided.

  The backflow prevention circuit 22 will be described. As shown in FIGS. 1 to 4, for example, a main backflow prevention system 21 a is disposed on the front side in the depth direction of the cabinet 1, and a sub-backflow prevention system 21 b is disposed on the back side. It is comprised by the parallel circuit by which this is arrange | positioned. Specifically, as shown in FIGS. 1 and 4, the main backflow prevention system 21a includes a backflow prevention device 26 (for example, a pair of check valves sandwiching an intermediate chamber) having the same diameter as the pump diameter (the same diameter as the pump unit). It has a structure attached). Of the ports formed on both sides of the backflow prevention device 26, the primary port (inlet side) has an opening / closing valve having the same diameter as the pump diameter (corresponding to the first opening / closing valve), For example, a ball valve 27 with a built-in strainer is directly connected. Also, an opening / closing valve (corresponding to the first opening / closing valve) having the same diameter, for example, a ball valve 28, is directly connected to the secondary portion (outlet side), and the primary and secondary sides of the backflow prevention device 26 are connected to each other. The deadline is possible. As shown in FIGS. 1, 2, and 4, the backflow prevention device 26 is installed sideways, that is, along the left-right direction of the cabinet 1 together with the ball valves 27 and 28. The primary-side ball valve 27 is connected to a header pipe 29 (the same diameter as the pump diameter) that extends in the depth direction and is connected to the rear end portion of the connection pipe 23.

  Here, the relay pipe 20 is bent so as to go from the upper depth side of the cabinet 1 toward the lower front side as shown in FIG.

  The ball valve 28 on the secondary side is connected to the end (lower side) of the relay pipe 20, and the entire main backflow prevention system 21a is accommodated in a limited space in the left-right direction (width direction) in the cabinet 1. I am letting.

  As shown in FIGS. 3 and 4, the auxiliary backflow prevention system 21b has a backflow prevention device 30 (for example, a pair of check valves sandwiching an intermediate chamber) having a smaller diameter (smaller than the pump unit) than the pump diameter. It has). Of the ports formed on both sides of the backflow prevention device 30, the primary side mouth portion (inlet side) has a diameter corresponding to the diameter of the backflow prevention device 30 (a diameter smaller than the pump diameter). On-off valve (second on-off valve), for example, a ball valve 31 with a built-in strainer is directly connected. Similarly, a small-diameter opening / closing valve (corresponding to the second opening / closing valve), for example, a ball valve 32, is directly connected to the secondary portion (outlet side), and the primary and secondary sides of the backflow prevention device 30 are connected to each other. The deadline is possible. This backflow prevention device 30 is installed in parallel with the ball valves 31 and 32 on the depth side of the cabinet 1 adjacent to the backflow prevention device 26 as shown in FIGS. The primary-side ball valve 31 is connected to the header pipe 29 via a piping material 33a having a diameter corresponding to the pump diameter. Further, the secondary ball valve 32 is connected to the middle of the relay pipe 20 disposed obliquely as shown in FIG. 2 via a piping material 33b having a diameter corresponding to the pump diameter, and a secondary backflow prevention system. 21b is bypassed with respect to the main backflow prevention system 21a. By adopting these small-diameter devices, the entire auxiliary backflow prevention system 21b is made compact. Due to this feature, the secondary backflow prevention system 21b is mounted in a limited space on the side of the main backflow prevention system 21a.

  That is, the backflow prevention circuit 22 does not change the main backflow prevention system 21a as it is, and the sub-backflow prevention system 21b is made compact so that the entire backflow prevention circuit 22 is not impaired without impairing normal operation. We are trying to make it more compact. Thereby, the installation of the parallel type backflow prevention circuit 22 that is impossible with the same diameter is realized. In addition, each ball valve 27, 28, 31, 32 of the backflow prevention circuit 22 is opened (water flowable state). However, 26a shows the drain piping extended from the drain hole formed in the lower part of the backflow prevention apparatus 26, 30a shows the drain piping extended from the drain hole formed in the lower part of the backflow prevention apparatus 30. FIG.

  And from the front-end | tip part of the connecting pipe 23 which protruded out of the cabinet 1, the inlet 35 for the water main connection which can be connected with a water main (corresponding to a water distribution pipe main: not shown) is formed. Reference numeral 36 denotes a bypass pipe with a built-in check valve that bypasses from the suction-side merging pipe 11 to the discharge-side merging pipe 15 during high water distribution (when the suction-side pressure becomes higher than the target pressure). A support member that supports each part of the unit 5 and each part of the backflow prevention circuit 22 is shown, and 38 denotes a pressure sensor. However, although not shown, a control panel with a built-in control device is provided above the cabinet 1.

  In such a direct-coupled water supply device, when the supply pressure of the water main can sufficiently meet the demand for tap water, the tap water of the water main is supplied from the suction port 35 to the backflow prevention devices 26 and 30 and the water supply pump. 6 and the bypass pipe 36 with a built-in check valve for bypassing from the above-described suction-side merging pipe 11 to the discharge-side merging pipe 15, the gas is supplied from the outlet 17 to the household faucet. At this time, if there is much demand on the use side and supply cannot be covered only by the pressure of the water main, the water supply pump 6 starts operation and compensates for the amount and pressure of the insufficient tap water.

  Here, when the inside of the main backflow prevention device 26 is inspected, a time zone with a small amount of water supply is selected, both sides of the backflow prevention device 26 are closed, and the inspection work is performed. During this time, since the tap water flowing through the small-diameter backflow prevention device 30 (sub-side) is supplied to each household, it is not necessary to give a burden such as a water outage to the consumer. Of course, when the auxiliary backflow prevention device 26 is inspected, tap water is supplied to each household through the backflow prevention device 26 having the same diameter as that of the pump unit 5, so that the same water supply performance as in normal times is ensured. The

  Accordingly, since the backflow prevention circuit 22 employs the backflow prevention device 30 having a small diameter, the outer dimensions of the backflow prevention circuit 22 can be smaller than the structure using a plurality of sets of backflow prevention devices having the same diameter as the pump unit 5. 22 can be made compact, and the backflow prevention device 26 (main) can be inspected with reduced burden on the consumer. Moreover, since the backflow prevention device 30 tends to be more expensive as the diameter increases, the use of the backflow prevention device 30 having a smaller diameter may be an inexpensive product, and the cost of the backflow prevention circuit 22 can be reduced.

  In addition, the components that shut off the backflow prevention device 30 employ small-diameter ball valves 31 and 32 (open / close valves) in accordance with the small-diameter backflow prevention device 30, so that the backflow prevention circuit 22 is not compact. Therefore, it is possible to stop water flow where necessary.

  In particular, when the pump unit 5 is a package-type directly connected water supply apparatus that accommodates the pump unit 5 in the cabinet 1 having a limited size together with the backflow prevention circuit 22, the backflow prevention device 30 with a small diameter and the ball valves 30 and 31 with a small diameter are provided. A compact direct-connection water supply system that takes advantage of

[Second Embodiment]
In the first embodiment, the header pipe 29 is used to bypass the small-diameter backflow prevention device 30 in the backflow prevention device 26 having the same diameter as the pump bore diameter. A structure in which straight pipe portions 40 are formed at both ends of the main backflow prevention system 21a as in the second embodiment shown, and branched from the straight pipe portions 40, 40 to bypass the sub-backflow prevention system 21b. But you can. In FIG. 5, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

1 is a partially cutaway front view of a direct-coupled water supply apparatus according to a first embodiment of the present invention. The right view of the same apparatus. The front sectional view of the direct connection type water supply apparatus which follows the arrow AA line in FIG. The plane sectional view of the direct connection type water supply apparatus which follows the arrow BB line in FIG. The top view of the backflow prevention circuit used as the principal part of the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cabinet, 5 ... Pump unit, 17 ... Discharge port, 22 ... Backflow prevention circuit, 26 ... Backflow prevention device of same diameter as pump unit diameter, 27, 28 ... Ball valve (first on-off valve), 30 ... Small diameter Backflow prevention device, 31, 32 ... ball valve (second on-off valve), 35 ... suction port.

Claims (2)

A cabinet with a vertical box shape whose left-right direction is longer than the depth ,
A plurality of pumps provided in the cabinet , the discharge holes of which are provided on the front side of the cabinet on the side surface, and an electric motor provided on the upper side of the plurality of pumps. A pump unit in which the suction holes are directly connected to the output shaft of the electric motor so as to face downward, and the electric motor and the pump are arranged in parallel in the left side of the upper stage of the cabinet. When,
A first backflow prevention device connected to the suction holes of the plurality of pumps, disposed in the cabinet and below the plurality of pumps, and having the same diameter as the diameter of the pump unit;
A second backflow prevention device disposed in the cabinet and below the plurality of pumps, assembled in parallel to the first backflow prevention device, and having a diameter smaller than the diameter of the pump unit;
A suction side merging pipe connected to the suction hole of the pump, which is provided in the cabinet and extends directly in the left-right direction below the pump unit;
Provided in the cabinet, one end thereof is connected to the end of the merging pipe on the suction side, and is bent in a U-shape toward the front obliquely lower side of the merging pipe on the suction side, A relay pipe formed to have the same diameter as the pump,
An L-shaped discharge pipe provided in the cabinet and facing the lower side of the same diameter as the pump connected to the discharge hole;
A discharge-side merge pipe extending in the left-right direction and disposed in front of the water supply pump in the cabinet and above the first backflow prevention device, and connected to the discharge pipe;
With
The first backflow prevention device is disposed extending in the left-right direction in the cabinet and obliquely below the front side of the merging pipe on the suction side,
The said 2nd backflow prevention apparatus is extended and arrange | positioned in the said left-right direction in the said cabinet and under the said merge pipe, The direct connection type water supply apparatus characterized by the above-mentioned . The primary side and the secondary side of the first backflow prevention device are each provided with a first opening / closing valve having the same diameter as the diameter of the pump unit,
2. The second on-off valve having a small diameter according to the diameter of the second backflow prevention device is provided on each of the primary side and the secondary side of the second backflow prevention device . Directly connected water supply system.

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