JP4589278B2 - Booster water supply device - Google Patents

Description

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

  Water supply systems that supply tap water for water supply mains used in condominiums and apartments are regulated by the supply pressure of the water supply mains. May be insufficient. Therefore, in a water supply system of an apartment or an apartment, such a situation is avoided by adopting a pressure increasing water supply device.

  Normally, a booster water supply device is equipped with a pump unit in the middle of the pipe from the water supply main to each household, and when the pressure or flow rate of the water supply main is insufficient, it is compensated for the pump unit. Increase water pressure during operation to supply water.

  By the way, there is a possibility that the tap water may flow backward to the water distribution main because the pressure-increasing water supply device is connected directly to the water distribution main and supplies water. Therefore, in the pressure increasing water supply device, a backflow prevention circuit is provided in the middle of the water passage of the pump unit to prevent backflow of tap water to the water supply main. Usually, the backflow prevention circuit is provided with a backflow prevention device in a part of the pump unit, for example, a piping member on the suction side or the discharge side.

  However, if there is only one backflow prevention device, maintenance of the backflow prevention device, such as periodic inspection, can be performed only after the water flow is stopped, and the maintenance work cannot be performed, and water must be cut off.

Therefore, the backflow prevention circuit adopts a structure in which a backflow prevention device as a sub is connected in parallel on a horizontal plane with respect to the main backflow prevention device as shown in Patent Document 1, and one of the backflow prevention circuits is used. At the time of maintenance of the prevention device, the other backflow prevention device secures a backflow prevention function to avoid water breakage accompanying maintenance work.
JP 2005-350957 A

  The pressure-increasing water supply device is desired to suppress the area in the horizontal projection direction, which is the installation area, so that it can be installed even in a narrow space.

  By the way, the external dimensions of the backflow prevention device are large because a structure using a double check valve, a structure for leaking water to the outside of the device in the event of an abnormality (both for ensuring safety), and the like are adopted. For this reason, the backflow prevention circuit in which a plurality of (two) backflow prevention devices are assembled in parallel on the horizontal plane tends to occupy a large area in the horizontal direction, and the installation area of the pressure increasing water supply device (the horizontal projection direction) ) Is difficult to reduce. In particular, in order to reduce the installation area, the package type booster water supply device that houses the pump unit and backflow prevention circuit together in a two-story structure inside the cabinet has a larger installation area (horizontal projection area) of the backflow prevention circuit. Since it occupies most of the installation area (horizontal projection area) of the water supply device, it is difficult to reduce the installation area because of its structure.

  Then, the objective of this invention is providing the pressure increase water supply apparatus in which the installation area (horizontal projection area) of a backflow prevention circuit is suppressed.

In order to achieve the above-mentioned object, the invention according to claim 1 has a suction port for connecting a water main and a discharge port for connecting a water supply pipe, and water from the suction port to the discharge port through a water passage. A pump unit that performs pressure feeding, and a backflow prevention circuit that is provided in a water passage of the pump unit and regulates a backflow from the water supply pipe side to the water distribution main pipe side, and the backflow prevention circuit includes a main backflow prevention device, The auxiliary anti-reverse device is composed of a parallel circuit arranged in a direction perpendicular to the ground .

In the invention according to claim 2, in the backflow prevention circuit, one of the main backflow prevention device and the auxiliary backflow prevention device is disposed laterally on the upper side of the same vertical surface as assumed on the ground, and the lower side of the backflow prevention circuit The other of the main backflow prevention device and the auxiliary backflow prevention device is disposed sideways, and the main backflow prevention device and the auxiliary backflow prevention device are connected in parallel by a piping member .

  The invention according to claim 3 is a collective drainage pipe in which the drainage structure of the main backflow prevention device and the auxiliary backflow prevention device is also reduced in piping space, and the escape hole and the secondary backflow prevention device of the main backflow prevention device. The water leakage from the escape holes was collected and drained.

  The invention according to claim 4 has a configuration in which a water leak detector is provided in a collective piping portion where water leaks gather so that water leak detection can be performed with a structure in which equipment space is suppressed.

  The invention according to claim 5 is configured such that the pump unit and the backflow prevention circuit are accommodated in a common cabinet so as to be applied to a package type pressure increasing water supply apparatus.

  According to the first and second aspects of the present invention, the main backflow prevention device and the auxiliary backflow prevention device that occupy a large area are arranged in a two-story manner, so that the horizontal projection that is the installation area of the backflow prevention circuit The area is small.

  Therefore, the installation area (horizontal projection area) of the pressure-increasing water supply device can be reduced. In particular, when the main backflow prevention device and the auxiliary backflow prevention device are arranged above and below the same vertical plane, the maximum effect can be expected.

  According to the invention of claim 3, the drainage of the main backflow prevention device and the sub-backflow prevention device is also a structure in which the piping space is reduced by a structure that drains water leaks using a collective drainage pipe. Contributes to reducing the installation area of water supply equipment.

  According to the invention which concerns on Claim 4, the installation of a water leak detector also has the structure which restrained equipment space, and contributes to reduction of the installation area of a pressure increase water supply apparatus.

  According to the invention which concerns on Claim 5, the pressure increase water supply apparatus which restrained the installation area using the characteristic of arrangement | positioning of the main backflow prevention apparatus of 2 stories and the said sub-backflow prevention apparatus is obtained.

[One Embodiment]
Hereinafter, the present invention will be described based on an embodiment shown in FIGS.

  1 is a front view of a pressure-increasing water supply device, for example, a package-type pressure-increasing water supply device, FIG. 2 is a right-side sectional view of the device, and FIG. 3 is a depth side structure of the device. FIG. 4 is a perspective view schematically showing a piping path of the apparatus.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes an installation stand installed at a desired installation location, and 2 denotes a vertical cabinet installed on the installation stand 1. The cabinet 2 has a longitudinal main body 3 that has a long left and right direction, an extremely short depth, and an open front, and a removable front cover 4 that closes the front opening of the main body 3 (FIG. 2 only). An elongated vertical structure is used in combination with (shown).

  A pump unit 5 is accommodated at the uppermost rightmost point in the main body 3. Explaining the pump unit 5, the pump unit 5 includes a pair of vertical (two) feed pumps 6 arranged in parallel in the left-right width direction, for example. Each of these water supply pumps 6 has, for example, a structure having an electric motor unit 7 on the upper side and a multistage turbine pump unit 8 directly connected to an output shaft (not shown) of the motor 7 on the lower side. And the discharge port 8a which exists in the upper side of the turbine pump part 8 faces the front, and the suction hole 8b which exists in the lower part faces downward.

  As shown in FIGS. 2 to 4, the suction holes 8 b of the respective water supply pumps 6 are connected to a suction-side merging pipe 11 (through the present application) disposed directly below the turbine pump unit 8 via an on-off valve 10. Connected to a waterway). The junction pipe 11 extends in the left-right direction (width direction), and the tip portion is bent downward in the middle. Further, as shown in FIGS. 1, 2, and 4, an L-shaped discharge pipe 12 (built-in check valve) and an on-off valve 13 are sequentially connected to the discharge hole 8 a of each turbine pump unit 8. Thus, a discharge pipe extending downward is formed. Each on-off valve 13 is connected to a discharge-side merging pipe 14 (extending in the left-right direction) arranged in parallel with the suction-side merging pipe 11. These merging pipes 11 and 14 are installed on a pump base 15 assembled in the main body 3, and the pump unit 5 is installed in the middle and upper stages in the cabinet 2. An open / close valve 18 is connected to the left end of the junction pipe 14 facing downward. The remaining end portion of the on-off valve 18 is a discharge port portion 19 for connecting a water supply pipe (corresponding to a discharge port for connecting a water supply pipe).

  On the other hand, a parallel backflow prevention circuit 20 is housed in the empty space immediately below and at the left end of the junction pipe 11 so as to occupy the same space. The backflow prevention circuit 20 will be described with reference to FIGS. 2 to 4. A suction port 11 a (shown in FIG. 2) at the left end of the merging pipe 11 includes a normally open on-off valve 21 (for maintenance), a horizontally long main The backflow prevention devices 22 are connected in order in the horizontal direction. Further, a connecting portion 23 for bypass connection that branches off from a middle portion of the junction pipe 11, for example, a junction pipe portion between the on-off valves 10 and 10 and protrudes downward, has a relay pipe portion 24 that bends to the right, and a U portion that extends downward. Shaped relay pipe portions 25 are sequentially connected. A normally closed on-off valve 26 (for maintenance) and a horizontally long sub-backflow prevention device 27 are sequentially connected in a lateral direction to an end portion (lateral direction) of the relay pipe portion 25 disposed immediately below the merging pipe 11. An on-off valve 26 and a secondary backflow prevention device 27 are arranged immediately below the pipe 11, the on-off valve 21 and the main backflow prevention device 22 in accordance with the arrangement of the devices. A branch joint 29 is connected to the primary end of the sub-backflow prevention device 27. Specifically, the branch joint 29 has, for example, a suction port 29a for water supply main connection at the bottom (corresponding to a suction port for distribution main connection), and connection ports 29b on the right side and the upper side. It is composed of a T-shaped joint part having 29c, and the primary end of the auxiliary backflow prevention device 27 is connected to the connection port 29b facing the right side with the normally closed on-off valve 28 (for maintenance) interposed therebetween. It is. The connection port 29c facing upward and the primary end portion of the main backflow prevention device 22 are connected using a normally open type on-off valve 31 (vertical direction) for maintenance and a crank-shaped relay pipe portion 32. Is done. Thus, the vertical bypass type backflow prevention circuit 20 in which the main backflow prevention device 22 and the auxiliary backflow prevention device 27 are arranged in the vertical direction is installed in the cabinet 2. Of course, the backflow prevention circuit 20 includes the main backflow prevention device 22 disposed on the left side of the junction pipe 11 and the sub-backflow prevention device 27 disposed in an empty space immediately below the junction pipe 11. It is installed using the space sufficiently. In particular, the vertical bypass type backflow prevention circuit 20 assumes the same vertical plane assuming a vertical plane a passing through the axis of the junction tube 11 as shown in FIG. 4 so that the installation area (horizontal projection area) is suppressed as much as possible. The main backflow prevention device 22 is arranged on the upper side of the a, and the sub-backflow prevention device 27 is arranged on the lower side. A parallel circuit connected by members is used.

  Here, each of the main backflow prevention device 22 and the secondary backflow prevention device 27 has a pair of check valves 34a and 34b for preventing backflow on the primary side and the secondary side of the main body 33 as shown in FIG. In addition, in an intermediate chamber (not shown) formed in the middle of the main body portion 33, a relief valve 34c that escapes water leakage inside the device that occurs when the device is abnormal (for example, when the check valves 34a and 34b fail) to the outside. And a structure having a relief port 35 (corresponding to the relief hole of the present application) for allowing leakage of water leaked from the relief valve 34c to the lower portion of the main body 33 is used. That is, the flow (back flow) toward the water supply main pipe side can be prevented from the check function provided by the check valves 34a and 34b. From the combination of the main / sub backflow prevention devices 22, 27 and the on-off valves 21, 26, 28, 31, water is normally supplied through the main backflow prevention device 22, and during maintenance of the main backflow prevention device 22, Water is supplied through the prevention device 27. In addition, 36 in FIG.1, FIG3 and FIG.4 is a branch pipe extended from a water supply main pipe (not shown) connected to the suction inlet 29a, 37 is a water supply pipe extended from each door connected to the discharge outlet 19 Indicates.

  In addition, a collective drainage pipe 40 that occupies a small space is assembled in each escape port 35 of the main / sub-backflow prevention devices 22, 27. That is, the drainage pipe 40 has an L-shaped relay pipe 41 connected to the escape port 35 of the auxiliary backflow prevention device 27, for example. The leading end of the L-shaped relay pipe 41 passes directly below the auxiliary backflow prevention device 27, the on-off valve 28 assembled to the device 27 and various piping members assembled to the on-off valve 28, and the main backflow prevention device 22 to the left. It extends to the same point as the middle part of. Connected to the distal end of the relay pipe 41 is a collecting pipe, for example, a T-shaped collecting pipe 43 whose upper and side portions are receiving port portions 42a and 42b and whose lower side is a drain port 42c. Specifically, the receiving opening 42 b on the side of the collecting pipe 43 is connected to the distal end of the relay pipe 41. The upper receiving port portion 42b and the escape port portion 35 in the upper main backflow prevention device 22 arranged at substantially the same position in the vertical direction are connected to an on-off valve 28 on the way by a relay pipe, for example, a flexible tube 44. And it is connected while avoiding various piping members. As a result, the horizontal projection area such as the collective drainage pipe 40 in which the drainage from the main backflow prevention device 22 and the secondary backflow prevention device 27, that is, the water leaking out from the escape port 35 at the time of abnormality, gathers in the vertical direction is suppressed. The drainage structure allows drainage to the outside.

  Further, a leak detector 46 is incorporated in a short cylindrical drain pipe 45 (corresponding to the collective pipe portion) connected to the drain port 42c, and from the leak detection performed by the common (one) leak detector 46, Abnormalities (such as failure) of the main backflow prevention device 22 (mainly used during normal operation) and the sub-backflow prevention device 27 (mainly used during maintenance) can be detected. However, the water leakage detector 46 includes a plurality of electrode portions 46a as detection portions disposed inside the drain pipe 46a, and a holder for taking out signals from the electrode portions 46a disposed outside the water distribution pipe 46a. A structure combining the portion 46b is used.

  47 is a branch formed in the junction pipe 14 on the discharge side by branching from the relay pipe section 24 connected to the junction pipe 11 on the suction side when the water distribution is high (when the pressure on the suction side becomes higher than the target pressure). A bypass pipe built in the check valve 47a to be bypassed to the section 14a, 48 is an accumulator for supplementing water supply accommodated in the cabinet 2 adjacent to the water supply pump 6, and 49 is the most adjacent to the accumulator 48 in the cabinet 2 A control panel housed in a point closer to the left side (built-in control equipment necessary for pump control of directly connected water supply) and 24a indicate branch portions branched from the relay pipe portion 24, respectively.

  Next, the operation of the pressure increasing water supply apparatus configured as described above will be described.

  In other words, it is assumed that the supply pressure of the water distribution main can sufficiently meet the demand for tap water. At this time, the tap water of the water distribution main pipe is connected to the merging pipe 14 through the inlet 29 a, the on-off valve 31, the main backflow prevention device 22, the on-off valve 21, the merging pipe 11 (suction side), the relay pipe 24 and the bypass pipe 47. By a path bypassed to (discharge side), it is supplied from the discharge port portion 19 to the faucet of each door. A part of the tap water also flows through the water supply pump 6. At this time, the backflow prevention function of the main backflow prevention device 22 allows the water supply to be continued satisfactorily without flowing back to the water supply mains.

  When there is much demand on the use side and supply cannot be covered only by the pressure of the water distribution mains, the water supply pump 6 is operated to compensate for the insufficient amount or pressure of tap water. At this time, the tap water passes through the on-off valve 31, the main backflow prevention device 22, the on-off valve 21, the merging pipe 11 (suction side), the on-off valve 10, the turbine pump unit 8, and the merging pipe 14 (discharge side). And supplied to the faucet of each house. Of course, the main backflow prevention device 22 does not generate backflow. The solid-line arrows in FIGS. 1 to 3 indicate the flow of water when the pump is in operation.

  Here, for example, it is assumed that the check function of the main backflow prevention device 22 is abnormal (due to a failure of the check valves 34a, 34b, etc.), and water leaked inside the device flows out from the escape port 35. Then, the water leakage is discharged to the outside through the flexible tube 44, the collecting pipe 43 and the drain pipe 45. At this time, the occurrence of water leakage is detected by the water leakage detector 46 and an abnormal situation is notified.

  On the other hand, when performing maintenance inside the main backflow prevention device 22, the on-off valves 21 and 31 on both sides of the main backflow prevention device 22 are closed, and the on-off valves 26 and 28 on both sides of the sub-backflow prevention device 27 are opened. Perform maintenance work. During this time, since the tap water flowing through the auxiliary backflow prevention device 27 is supplied to each household, the tap water is not burdened on the consumer. In addition, the arrow shown with a dashed-dotted line in FIGS. 1-3 shows the flow of the water at the time of a maintenance.

  According to the pressure increasing water supply apparatus configured as described above, the backflow prevention circuit 20 has a two-story structure, that is, a vertical bypass structure in which the main and auxiliary backflow prevention devices 22 and 27 are bypassed in the vertical direction. Since it is adopted, the horizontal projection area, which is the installation area, can be smaller than the structure arranged in the horizontal direction.

  Since the installation area of the pressure increasing water supply apparatus depends on the installation area of the backflow prevention circuit 20, the installation area of the backflow prevention circuit 20 can be reduced as much as possible. In particular, as shown in FIGS. 1 to 4, in order to reduce the installation area, if the package type is such that the pump unit 5 and the backflow prevention circuit 20 are housed together in a two-story shape inside the cabinet 2, the backflow prevention circuit 20 Installation area (horizontal projection area) tends to occupy most of the installation area (horizontal projection area) of the booster water supply device, so the installation area of the booster water supply device is reduced. Specifically, the booster water supply device Therefore, a thin package type pressure-increasing water supply device excellent in installation property can be provided. If this is a vertical bypass type in which the main backflow prevention device 22 and the sub-backflow prevention device 27 are arranged above and below the same vertical plane a, the maximum effect can be expected.

  In addition, the drainage of the main backflow prevention device 22 and the sub-backflow prevention device 27 is not an individual type, but a vertical collective drainage pipe 45 that gathers in the direction directly below the backflow prevention devices 22 and 27 is adopted. The drainage of the device 22 and the auxiliary backflow prevention device 27 can be made with a structure that suppresses the piping space, and the reduction of the installation area of the pressure increasing water supply device is not impaired. In addition, when the water leak detector 46 is provided in the drain pipe 45 where water leaks gather, the single water leak detector 46 can detect the water leak of the device into two, the main backflow prevention device 22 and the sub backflow prevention device 27. In addition, the water leakage detector 46 also has a structure in which the equipment space is reduced, and the reduction of the installation area of the pressure-increasing water supply device is not impaired. In addition, since one water leak detector 46 is sufficient, the cost is excellent.

  The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. For example, in one embodiment, a package-type pressure-increasing water supply device has been described as an example. However, the present invention is not limited thereto, and may be applied to other types of pressure-increasing water supply devices.

The front view of the pressure increase water supply apparatus which concerns on one Embodiment of this invention. The sectional side view of the pressure increase water supply apparatus. The front sectional view which shows the structure of the depth side of the pressure increase water supply apparatus which follows the AA line in FIG. The perspective view which shows typically the piping path | route of the said pressure increase water supply apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Cabinet, 5 ... Pump unit, 11 ... Condensing pipe (water flow path) of suction side, 19 ... Discharge port part (discharge port for water supply piping connection), 20 ... Backflow prevention circuit, 22 ... Main backflow prevention device, 27 ... Sub-backflow prevention device, 29a ... Suction port (suction port for distribution main pipe connection), 35 ... Release port part (relief hole), 40 ... Collecting drain pipe, 45 ... Drain pipe (collecting pipe part).

Claims (5)

A pump unit having a suction port for connecting a water distribution main and a discharge port for connecting a water supply pipe, and pumping water through the water passage from the suction port to the discharge port;
A backflow prevention circuit that is provided in a water passage of the pump unit and regulates a backflow from a water supply pipe side to a water distribution main pipe side;
The said backflow prevention circuit is comprised with the parallel circuit by which a main backflow prevention apparatus and a sub-backflow prevention apparatus are arrange | positioned along with the orthogonal | vertical direction with respect to the ground . The pressure increase water supply apparatus characterized by the above-mentioned. In the backflow prevention circuit, one of the main backflow prevention device and the auxiliary backflow prevention device is disposed sideways on the upper side on the same vertical plane as assumed with respect to the ground, and the main backflow prevention device and the auxiliary backflow prevention device are arranged on the lower side. The pressure increasing water supply apparatus according to claim 1, wherein the other of the prevention devices is disposed sideways, and the main backflow prevention device and the auxiliary backflow prevention device are connected in parallel by a piping member. Each of the main backflow prevention device and the auxiliary backflow prevention device has an escape hole for escaping water leakage inside the device that occurs at the time of abnormality to the outside of the device,
The collective drainage pipe that collects and drains water leaked from the escape hole is connected to the escape hole of the main backflow prevention device and the escape hole of the auxiliary backflow prevention device, respectively. The pressure increase water supply apparatus of Claim 2.   The pressure increasing water supply device according to claim 3, wherein the collective drainage pipe is provided with a water leak detector at a collective pipe portion where water leaks gather.   The said pressure unit and the said backflow prevention circuit are accommodated in the common cabinet, The pressure increase water supply apparatus as described in any one of Claim 1 thru | or 4 characterized by the above-mentioned.

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