Water supply device

Abstract

To disclose one example of a water supply device which can determine the damage to a check valve.SOLUTION: When the lowering of the pressure of a first pump 3A is confirmed, and the lowering of the pressure of a second pump 3A is confirmed, a control device 10 determines that a third check valve 8 is damaged (S23). When the lowering of the pressure of the first pump 3A is not confirmed, and the lowering of the pressure of the second pump 3B is confirmed, the control device 10 determines that a first check valve 6 is damaged (S26). When the lowering of the pressure of the first pump 3A is not confirmed, and the lowering of the pressure of the second pump 3B is not confirmed, the control device 10 determines that any of the first check valve 6 to the third check valve 8 is not damaged (S27).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a water supply apparatus capable of determining damage to a check valve. [Background technology]

[0002] For example, in the water supply device described in Patent Document 1, a determination is made as to whether or not the electric motor that rotates the pump impeller is rotating in reverse to determine whether or not damage has occurred to a check valve provided in the water supply device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-212467 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure discloses an example of a water supply apparatus capable of determining damage to a check valve using a method different from that disclosed in Patent Document 1. [Means for solving the problem]

[0005] It is desirable for the water supply device (1) to have at least one of the following components, for example. That is, the water supply pump device (3) includes a first pump (3A) and a second pump (3B) arranged in parallel with each other, a first check valve (6) provided at the discharge port of the first pump (3A), a second check valve (7) provided at the discharge port of the second pump (3B), a third check valve (8) provided in a bypass section (13) connecting the inlet side and the outlet side of the pump device (3) and prohibiting a flow from the outlet side to the inlet side, a flow rate sensor (5) for detecting the amount of water supplied to a water supply destination, and a pump (6) for detecting the amount of water supplied to a water supply destination. a pressure sensor (4) that detects the water pressure on the discharge side of the pump device (3); a pump control unit (10A) that controls the operation of the pump device (3) by utilizing detection signals from the pressure sensor (4) and the flow rate sensor (5); and a damage identification determination unit (10B) that uses the detection signals from the flow rate sensor (5) and the pressure sensor (4) to identify which of the first check valve (6), the second check valve (7), and the third check valve (8) is damaged.

[0006] Then, the damage identification determination unit (10B) determines that the third check valve (8) is damaged when the damage identification determination unit (10B) determines that the first detected pressure (Pm1) is equal to or less than the predetermined specified pressure (P1), the second detected pressure (Pm2) is equal to or less than the specified pressure (P1), and the first detected flow rate (Fm1) is equal to or less than the predetermined specified flow rate (Fo), and the second detected flow rate (Fm2) is equal to or less than the specified flow rate (Fo).

[0007] In addition, the damage identification determination unit (10B) determines that the second check valve (7) is damaged when the damage identification determination unit (10B) determines that the first detected pressure (Pm1) is equal to or less than the specified pressure (P1) and the second detected pressure (Pm2) is greater than the specified pressure (P1), and also that the first detected flow rate (Fm1) is equal to or less than the specified flow rate (Fo) and the second detected flow rate (Fm2) is greater than the specified flow rate (Fo).

[0008] Furthermore, the damage identification determination unit (10B) determines that the first check valve (6) is damaged when the damage identification determination unit (10B) determines that the second detected pressure (Pm2) is equal to or less than the specified pressure (P1), the first detected pressure (Pm1) is greater than the specified pressure (P1), and the second detected flow rate (Fm2) is equal to or less than the specified flow rate (Fo), and the first detected flow rate (Fm1) is greater than the specified flow rate (Fo).

[0009] The first detected pressure (Pm1) refers to the water pressure detected by the pressure sensor (4) when the first pump (3A) is operating and the second pump (3B) is stopped. The second detected pressure (Pm2) refers to the water pressure detected by the pressure sensor (4) when the second pump (3B) is operating and the first pump (3A) is stopped.

[0010] The first detected flow rate (Fm1) refers to the flow rate detected by the flow sensor (5) when the first pump (3A) is operating and the second pump (3B) is stopped. The second detected flow rate (Fm2) refers to the flow rate detected by the flow sensor (5) when the second pump (3B) is operating and the first pump (3A) is stopped.

[0011] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram of a water supply device according to a first embodiment. [Diagram 2] 5 is a flowchart showing the operation of a pump control unit according to the first embodiment. [Diagram 3] 5 is a flowchart showing the operation of a damage identification determiner according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiment.

[0014] (First embodiment) <1. Overview of the water supply system> In this embodiment, an example of the water supply device according to the present disclosure is applied to a direct-connection type water supply device. A direct-connection type water supply device is a water supply device that can supply water by using water supply pressure. For this reason, as shown in Fig. 1, the water supply device 1 does not include a water storage device such as a water tank.

[0015] <2. Configuration of the water supply device (see Figure 1)> The water supply device 1 at least includes a pump device 3, a pressure sensor 4, a flow rate sensor 5, a first check valve 6, a second check valve 7, a third check valve 8, a pressure accumulator 9, a control device 10, as well as piping materials constituting the flow path and flow path switching valves 11A-11D.

[0016] <Pump equipment> The pump device 3 receives tap water at its inlet side, and increases the water pressure of the inlet water to send it to a water supply destination such as a building. For this reason, tap water pressure acts on the inlet side of the installed pump device 3, and the outlet side is connected to the water supply destination.

[0017] A gate valve 12A and a backflow prevention device 12C are provided on the inflow side of the pump device 3. A gate valve 12B is provided on the outflow side of the pump device 3. The gate valves 12A and 12B are valves that open and close the flow path. The inflow side gate valve 12A has a built-in strainer to remove foreign matter from the supplied water.

[0018] The backflow prevention device 12C is provided downstream of the gate valve 12A. The backflow prevention device 12C allows water to flow from the water pipe to the inlet side of the pump device 3, and restricts water from flowing from the inlet side of the pump device 3 to the water pipe.

[0019] The pump device 3 according to this embodiment is configured to include a plurality of electric pumps (in this embodiment, a first pump 3A and a second pump 3B). The first pump 3A and the second pump 3B are arranged in parallel with each other in a water flow path extending from the inflow side to the outflow side.

[0020] In the pump device 3 according to this embodiment, the first pump 3A and the second pump 3B are operated alternately, and the two pumps 3A and 3B are not operated simultaneously. In other words, when the first pump 3A is operating, the second pump 3B is stopped.

[0021] Then, if the first pump 3A stops and the pump device 3 stops, the next time the pump device 3 operates, the second pump 3B operates and the first pump 3A is in a stopped state. After that, when the second pump 3B stops, the first pump 3A operates next.

[0022] <Pressure sensors, flow rate sensors> The pressure sensor 4 detects the water pressure (hereinafter referred to as the water supply pressure) of the water flowing into a water supply destination (e.g., a building) which is the water pressure on the discharge side of the pump device 3. The flow rate sensor 5 detects the flow rate (hereinafter referred to as the water supply amount) of water actually supplied to the water supply destination.

[0023] In addition, the flow sensor 5 in this embodiment inputs an ON signal to the pump control unit 10A when the water supply rate exceeds a predetermined flow rate (hereinafter referred to as the stop flow rate Fo), and inputs an OFF signal to the pump control unit 10A when the water supply rate is equal to or less than the stop flow rate Fo.

[0024] The pressure sensor 4 and the flow rate sensor 5 are provided in a flow path that connects the outflow side of the pump device 3 to the water supply destination. As a result, in this embodiment, the water supply pressure and the water supply amount can be detected by one pressure sensor 4 and one flow rate sensor 5 regardless of which of the multiple pumps 3A and 3B is operating.

[0025] <Check valve> The first check valve 6 is provided at the discharge port of the first pump 3A. The first check valve 6 prevents the water discharged from the first pump 3A from flowing into the first pump 3A from the discharge port of the first pump 3A.

[0026] The second check valve 7 is provided at the discharge port of the second pump 3B. The second check valve 7 prevents the water discharged from the second pump 3B from flowing into the second pump 3B from the discharge port of the second pump 3B.

[0027] The third check valve 8 is provided in the bypass section 13, and regulates the flow of water from the outflow side to the inflow side of the pump device 3. The bypass section 13 is a flow path that connects the inflow side and outflow side of the pump device 3.

[0028] In other words, the bypass section 13 guides the water that has flowed into the pump device 3 to the outflow side, bypassing the first pump 3A and the second pump 3B. The third check valve 8 regulates the water from flowing from the outflow side to the inflow side of the pump device 3 via the bypass section 13.

[0029] <Accumulator> The pressure accumulator 9 is a device for maintaining the water supply pressure when the pump device 3 is stopped. For this reason, the pressure accumulator 9 is connected to the outflow side of the pump device 3. The pressure accumulator 9 according to this embodiment is configured as an accumulator that utilizes gas pressure.

[0030] <Control device> The control device 10 includes a pump control unit 10A and a damage identification determination unit 10B, etc. The control device 10 is configured with a computer including a CPU, a ROM, a RAM, etc.

[0031] In this embodiment, the computer executes software to implement the pump control unit 10A and the damage identification determination unit 10B. The software is stored in advance in a non-volatile storage unit (not shown) such as a ROM.

[0032] <Pump control unit> The pump control unit 10A controls the operation of the pump device 3, that is, controls the start and stop of the pump device 3. Note that the pump control unit 10A according to the present embodiment controls the operation of the first pump 3A or the second pump 3B via the drive unit 10C.

[0033] The driving unit 10C according to this embodiment is configured to have an inverter type motor driving circuit. The driving unit 10C changes the frequency of the driving current (hereinafter referred to as the driving frequency) supplied to the first pump 3A or the second pump 3B to change and control the rotation speed of the pumps 3A and 3B.

[0034] At this time, the pump control unit 10A instructs the drive frequency that should be output by the drive unit 10C to the drive unit 10C. That is, the pump control unit 10A indirectly controls the operation of the pump device 3 via the drive unit 10C.

[0035] The pump control unit 10A controls the operation of the pump device 3, i.e., the first pump 3A and the second pump 3B, using a pressure control method. The pressure control method is an operation mode in which the rotation speed of the pump device 3, i.e., the drive frequency of the first pump 3A or the second pump 3B, is controlled by utilizing the pressure detected by the pressure sensor 4.

[0036] That is, when the pressure detected by the pressure sensor 4 becomes equal to or lower than a predetermined pressure (hereinafter referred to as a start pressure) while the pump device 3 is stopped, the pump control unit 10A starts the pump device 3.

[0037] In the pressure control operation mode, for example, the rotation speed of the pump device 3 is controlled so that the detected pressure becomes a target pressure (hereinafter referred to as the target pressure). The target pressure refers to a water supply pressure that makes the water pressure at the end of the water supply destination equal to or higher than a predetermined pressure.

[0038] Specifically, when the water demand at the water supply destination increases, the water supply pressure decreases. Therefore, the pump control unit 10A increases the rotation speed of the pump device 3 to be higher than the current rotation speed in order to maintain the water supply pressure at the target pressure.

[0039] When the water demand decreases while the rotation speed of the pump device 3 is increased, the water supply pressure increases. Therefore, the pump control unit 10A reduces the rotation speed of the pump device 3 from the current rotation speed in order to maintain the water supply pressure at the target pressure.

[0040] Then, when the water demand decreases and the water supply rate falls below a predetermined flow rate (in this embodiment, the stop flow rate Fo), the pump control unit 10A stops the pump device 3 and stops water supply by the first pump 3A or the second pump 3B.

[0041] <3. Damage Identification Judgment Department> <3.1 Overview of the Damage Identification Judgment Unit> The damage identification determination unit 10B determines whether or not a check valve is damaged among the first check valve 6, the second check valve 7, and the third check valve 8, using the detection signals of the flow rate sensor 5 and the pressure sensor 4. Specifically, the damage identification determination unit 10B determines the damaged check valve as follows.

[0042] <Terminology> The first detected pressure Pm1 refers to the water pressure detected by the pressure sensor 4 when the first pump 3A is operating and the second pump 3B is stopped. The second detected pressure Pm2 refers to the water pressure detected by the pressure sensor 4 when the second pump 3B is operating and the first pump 3A is stopped.

[0043] The first detected flow rate Fm1 refers to the flow rate detected by the flow sensor 5 when the first pump 3A is operating and the second pump 3B is stopped. The second detected flow rate Fm2 refers to the flow rate detected by the flow sensor 5 when the second pump 3B is operating and the first pump 3A is stopped.

[0044] The flow rate sensor 5 according to the present embodiment outputs an ON signal when the flow rate exceeds the stop flow rate Fo, and outputs an OFF signal when the water supply rate is equal to or less than the stop flow rate Fo. Therefore, in this embodiment, the first detected flow rate Fm1 and the second detected flow rate Fm2 are determined based on whether the signal is an ON signal or an OFF signal.

[0045] <Determining damage to the first check valve> The damage identification determining unit 10B determines that the first check valve 6 is damaged when each of the following first pressure requirement and first flow rate requirement is met at least once (in this embodiment, multiple times).

[0046] The first pressure requirement means that "the second detected pressure Pm2 is equal to or lower than the start pressure, and the first detected pressure Pm1 is higher than the start pressure." The first flow rate requirement means that "the second detected flow rate Fm2 is equal to or less than the stop flow rate Fo (the flow rate sensor 5 is off) and the first detected flow rate Fm1 is greater than the stop flow rate Fo (the flow rate sensor 5 is on)."

[0047] <Determining Damage to the Second Check Valve> The damage identification determination unit 10B determines that the second check valve 7 is damaged when each of the following second pressure requirement and second flow rate requirement is met at least once (in this embodiment, multiple times).

[0048] The second pressure requirement means that "the first detected pressure Pm1 is equal to or lower than the start-up pressure, and the second detected pressure Pm2 is higher than the start-up pressure." The second flow rate requirement means that "the first detected flow rate Fm1 is equal to or less than the stop flow rate Fo (the flow rate sensor 5 is off) and the second detected flow rate Fm2 is greater than the stop flow rate Fo (the flow rate sensor 5 is on)."

[0049] <Judgment of third check valve damage> The damage identification determination unit 10B determines that the third check valve 8 is damaged when each of the following third pressure requirement and third flow rate requirement is met at least once (in this embodiment, multiple times).

[0050] The third pressure requirement means that "the first detected pressure Pm1 is equal to or lower than the start-up pressure, and the second detected pressure Pm2 is equal to or lower than the start-up pressure." The third flow rate requirement means that "the first detected flow rate Fm1 is equal to or lower than the stop flow rate Fo (the flow rate sensor 5 is off) and the second detected flow rate Fm2 is equal to or lower than the stop flow rate Fo (the flow rate sensor 5 is off)."

[0051] <3.2 Details of the Damage Identification Judgment Division> <Pump device control> When the water supply device 1 is powered on, the control device 10 determines whether the first detected pressure Pm1 is equal to or lower than the start-up pressure (S1), as shown in Fig. 2. If the first detected pressure Pm1 is higher than the start-up pressure (S1: NO), the pump device 3 is maintained in a stopped state.

[0052] When the first detected pressure Pm1 is equal to or lower than the start-up pressure (S1: YES), the controller 10 starts the first pump 3A (S2), and then determines whether the first detected pressure Pm1 is higher than the start-up pressure (S3).

[0053] If the first detected pressure Pm1 is greater than the start pressure (S3: YES), the controller 10 determines whether the first detected flow rate Fm1 is equal to or less than the stop flow rate Fo (S4). If the first detected flow rate Fm1 is equal to or less than the stop flow rate Fo (S4: YES), the controller 10 stops the pump in operation, i.e., the first pump 3A (S5).

[0054] In S3, if the first detected pressure Pm1 is greater than the start pressure (S3: NO), the controller 10 determines whether the first detected flow rate Fm1 is equal to or less than the stop flow rate Fo (S6). If the first detected flow rate Fm1 is greater than the stop flow rate Fo (S5: NO), the controller 10 executes S3 again.

[0055] If the first detected flow rate Fm1 is equal to or less than the stop flow rate Fo (S6: YES), the control device 10 determines that a pressure drop has occurred in the first pump 3A, stops the first pump 3A, and increases a value indicating this (hereinafter, referred to as the stop count) by "1" from the current value (S7). The stop count is stored in a rewritable non-volatile storage unit.

[0056] Next, the control device 10 judges whether the second detected pressure Pm2 is equal to or lower than the start pressure (S8). The control device 10 also executes S8 when the first pump 3A is stopped in S5. If the second detected pressure Pm2 is higher than the start pressure (S8: NO), the stopped state of the pump device 3 is maintained.

[0057] When the second detected pressure Pm2 is equal to or lower than the start-up pressure (S8: YES), the controller 10 starts the second pump 3B (S9), and then determines whether the second detected pressure Pm2 is higher than the start-up pressure (S10).

[0058] If the second detected pressure Pm2 is greater than the start pressure (S10: YES), the controller 10 determines whether the second detected flow rate Fm2 is equal to or less than the stop flow rate Fo (S11). If the second detected flow rate Fm2 is equal to or less than the stop flow rate Fo (S11: YES), the controller 10 stops the pump in operation, i.e., the second pump 3B (S12).

[0059] In S10, if the second detected pressure Pm2 is greater than the start pressure (S10: NO), the controller 10 determines whether the second detected flow rate Fm2 is equal to or less than the stop flow rate Fo (S13). If the second detected flow rate Fm2 is greater than the stop flow rate Fo (S13: NO), the controller 10 executes S10 again.

[0060] If the second detected flow rate Fm2 is equal to or less than the stop flow rate Fo (S13: YES), the control device 10 determines that a pressure drop has occurred in the second pump 3B, stops the second pump 3B, and increases the number of times the second pump 3B has been stopped by "1" from the current value (S14).

[0061] <Damage identification judgment> 3 is executed when the pump device 3 is stopped. When the operation flow is started, the control device 10 first determines whether or not a pressure drop in the first pump 3A has been confirmed (S21).

[0062] Note that "the pressure drop of the first pump 3A has been confirmed" refers to a state in which the number of times the first pump 3A has stopped has reached a predetermined number (three times in this embodiment) or more. "The pressure drop of the first pump 3A has not been confirmed" refers to a state in which the number of times the first pump 3A has stopped has reached a predetermined number (three times in this embodiment).

[0063] Then, if the pressure drop of the first pump 3A is confirmed (S21: YES), the control device 10 judges whether or not the pressure drop of the second pump 3B is confirmed (S22). Note that the criterion for judging "whether or not the pressure drop of the second pump 3B is confirmed" is the same as that for judging "whether or not the pressure drop of the first pump 3A is confirmed."

[0064] If the pressure drop of the second pump 3B is confirmed (S22: YES), the control device 10 determines that the third check valve 8 is damaged and issues a warning to that effect (S23). If the pressure drop of the second pump 3B is not confirmed in S22 (S22: NO), the control device 10 determines that the second check valve 7 is damaged (S24).

[0065] If the pressure drop of the first pump 3A is not confirmed in S21 (S21: NO), the controller 10 judges whether the pressure drop of the second pump 3B is confirmed (S25). If the pressure drop of the second pump 3B is confirmed (S25: YES), the controller 10 judges that the first check valve 6 is damaged (S26).

[0066] If the pressure drop of the second pump 3B has not been confirmed (S25: NO), the control device 10 determines that none of the check valves, the first check valve 6 to the third check valve 8, is damaged. Note that in this embodiment, it is assumed that "since the possibility of multiple check valves being damaged simultaneously is extremely low, multiple check valves being damaged simultaneously will not occur."

[0067] <4. Features of the water supply device according to this embodiment> As described above, in the water supply device 1 according to this embodiment, the damaged check valve can be identified by utilizing the existing pressure sensor 5 and flow rate sensor 4 used in controlling the operation of the pump. This in turn makes it possible to improve the workability of repairing and maintaining the water supply device 1.

[0068] In the present embodiment, damage to the check valve is determined when both a pressure requirement (e.g., a first pressure requirement) and a flow rate requirement (e.g., a first flow rate requirement) are met, thereby improving the accuracy of the determination.

[0069] In other words, for example, when the amount of water supply required by the building is extremely large, it is possible that the water supply pressure will not exceed the first start-up pressure even if none of the first check valve 6 to the eighth check valve 8 are damaged.

[0070] Furthermore, for example, when the amount of water supply required by the building is extremely small, even if none of the first check valve 6 to the eighth check valve 8 are damaged, there may be cases where the amount of water supply does not greatly exceed the stop flow rate.

[0071] In the above case, if the configuration is such that damage to the check valve is determined based only on the pressure requirement or only on the flow rate requirement, there is a possibility that the check valve may be erroneously determined to be damaged even when none of the first check valve 6 to the eighth check valve 8 are damaged.

[0072] In contrast, the water supply device 1 of this embodiment is configured to determine damage to the check valve by taking into account pressure requirements and flow rate requirements, so that damage to the check valve can be appropriately determined even when the water supply amount is extremely large or extremely small.

[0073] (Other embodiments) In the above-described embodiment, an example of the water supply device according to the present disclosure is applied to a direct-connection type water supply device. However, the present disclosure is not limited thereto. That is, the present disclosure can also be applied to a water supply device including a water storage device such as a water tank.

[0074] The operation mode according to the above embodiment is a mode in which the rotation speed of the pump device 3 is controlled so that the water supply pressure becomes a target pressure based on the end pressure. However, the present disclosure is not limited to this. That is, the present disclosure may be, for example, a mode in which the target pressure is not based on the end pressure.

[0075] In the above-described embodiment, the pump control unit 10A and the damage identification determiner 10B are realized by executing software on a computer, but the present disclosure is not limited to this.

[0076] That is, the disclosure may be configured, for example, by dedicated hardware constituting pump control unit 10A and damage identification determiner 10B, respectively, or by a computer for the pump control unit and a computer for the damage identification determiner.

[0077] The flow sensor 5 according to the above embodiment is configured to output an ON signal when the water supply rate exceeds the stop flow rate, and to output an OFF signal when the water supply rate is equal to or lower than the stop flow rate. However, the present disclosure is not limited to this. That is, the present disclosure may be, for example, a flow sensor that outputs a continuous signal according to the water supply rate.

[0078] The pressure sensor 5 and the flow rate sensor 4 according to the above-described embodiment are disposed downstream of the assembly of the discharge pipes of the multiple pumps. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the pressure sensor 5 and the flow rate sensor 4 are disposed immediately above the discharge port of each pump.

[0079] In the above-described embodiment, damage to the check valve is identified using the detection values ​​of both the pressure sensor 5 and the flow rate sensor 4. However, the present disclosure is not limited to this. That is, the present disclosure may be configured to identify damage to the check valve using only the first pressure requirement, the second pressure requirement, and the third pressure requirement, or to identify damage to the check valve using only the first flow rate requirement, the second flow rate requirement, and the third flow rate requirement, for example.

[0080] The control device 10 with this configuration determines that the first check valve 6 is damaged if the first pressure requirement or the first flow rate requirement is met at least once, determines that the seventh check valve 7 is damaged if the second pressure requirement or the second flow rate requirement is met at least once, and determines that the third check valve 8 is damaged if the third pressure requirement or the third flow rate requirement is met at least once.

[0081] In the above embodiment, it is determined that "the pressure drop of the first pump 3A or the second pump 3B is confirmed" when the number of stops reaches a plurality of times or more. However, the present disclosure is not limited to this. That is, the disclosure may be determined that "the pressure drop of the first pump 3A or the second pump 3B is confirmed" when the number of stops occurs, for example.

[0082] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0083] 1... Water supply device 3... Pump device 3A... First pump 3B... Second pump 4... Pressure sensor 5... Flow rate sensor 6... First check valve 7... Second check valve 8... Third check valve 9... Accumulator 10... Control device 10A... Pump control unit 10B... Warning unit 10C... Drive unit 12A... Gate valve 12C... Backflow prevention device 12B... Gate valve 13... Bypass section

Claims

1. A pump device for supplying water, the pump device having a first pump and a second pump arranged in parallel with each other; a first check valve provided at a discharge port of the first pump; a second check valve provided at a discharge port of the second pump; a third check valve provided in a bypass section connecting the inlet side and the outlet side of the pump device, the third check valve preventing a flow from the outlet side to the inlet side; A flow rate sensor that detects the amount of water supplied to a water supply destination; a pressure sensor for detecting a water pressure on a discharge side of the pump device; a pump control unit that controls an operation of the pump device by using detection signals from the pressure sensor and the flow rate sensor; and a damage identification determination unit for identifying whether or not any one of the first check valve, the second check valve, and the third check valve is damaged by utilizing detection signals from the flow rate sensor and the pressure sensor, a first detected pressure is a water pressure detected by the pressure sensor when the first pump is operating and the second pump is stopped, and a first detected flow rate is a flow rate detected by the flow rate sensor when the first pump is operating and the second pump is stopped; When the water pressure detected by the pressure sensor when the second pump is operating and the first pump is stopped is defined as a second detected pressure, and when the flow rate detected by the flow rate sensor when the second pump is operating and the first pump is stopped is defined as a second detected flow rate, the damage identification determination unit determines that the third check valve is damaged when the first detected pressure is equal to or lower than a predetermined specified pressure, the second detected pressure is equal to or lower than the specified pressure, and the first detected flow rate is equal to or lower than a predetermined specified flow rate, and the second detected flow rate is equal to or lower than the specified flow rate; the damage identification determination unit determines that the second check valve is damaged when the first detected pressure is equal to or less than the specified pressure, the second detected pressure is greater than the specified pressure, and the first detected flow rate is equal to or less than the specified flow rate, and the second detected flow rate is greater than the specified flow rate; The water supply system wherein the damage identification judgment unit judges that the first check valve is damaged when the second detected pressure is equal to or lower than the specified pressure, the first detected pressure is greater than the specified pressure, and the second detected flow rate is equal to or lower than the specified flow rate and the first detected flow rate is greater than the specified flow rate.

2. A pump device for supplying water, the pump device having a first pump and a second pump arranged in parallel with each other; a first check valve provided at a discharge port of the first pump; a second check valve provided at a discharge port of the second pump; a third check valve provided in a bypass section connecting the inlet side and the outlet side of the pump device, the third check valve preventing a flow from the outlet side to the inlet side; A flow rate sensor that detects the amount of water supplied to a water supply destination; a pressure sensor for detecting a water pressure on a discharge side of the pump device; a pump control unit that controls an operation of the pump device by using detection signals from the pressure sensor and the flow rate sensor; and a damage identification determination unit for identifying whether or not any one of the first check valve, the second check valve, and the third check valve is damaged by utilizing a detection signal from the pressure sensor, When the water pressure detected by the pressure sensor when the first pump is operating and the second pump is stopped is defined as a first detected pressure, and when the water pressure detected by the pressure sensor when the second pump is operating and the first pump is stopped is defined as a second detected pressure, the damage identification determination unit determines that the third check valve is damaged when the damage identification determination unit determines that the first detected pressure is equal to or lower than a predetermined specified pressure and the second detected pressure is equal to or lower than the specified pressure; the damage identification determination unit determines that the second check valve is damaged when the damage identification determination unit determines that the first detected pressure is equal to or less than the specified pressure and the second detected pressure is greater than the specified pressure, The water supply device, wherein the damage identification judgment unit judges that the first check valve is damaged when the damage identification judgment unit judges that the second detected pressure is equal to or lower than the specified pressure and the first detected pressure is greater than the specified pressure.

3. A pump device for supplying water, the pump device having a first pump and a second pump arranged in parallel with each other; a first check valve provided at a discharge port of the first pump; a second check valve provided at a discharge port of the second pump; a third check valve provided in a bypass section connecting the inlet side and the outlet side of the pump device, the third check valve preventing a flow from the outlet side to the inlet side; A flow rate sensor that detects the amount of water supplied to a water supply destination; a pressure sensor for detecting a water pressure on a discharge side of the pump device; a pump control unit that controls an operation of the pump device by using detection signals from the pressure sensor and the flow rate sensor; and a damage identification determination unit for identifying whether or not any one of the first check valve, the second check valve, and the third check valve is damaged by utilizing a detection signal from the flow rate sensor, A flow rate detected by the flow sensor when the first pump is operating and the second pump is stopped is defined as a first detected flow rate, and a flow rate detected by the flow sensor when the second pump is operating and the first pump is stopped is defined as a second detected flow rate, the damage identification determination unit determines that the third check valve is damaged when the damage identification determination unit determines that the first detected flow rate is equal to or less than a predetermined specified flow rate and the second detected flow rate is equal to or less than the specified flow rate; the damage identification determination unit determines that the second check valve is damaged when the damage identification determination unit determines that the first detected flow rate is equal to or less than the specified flow rate and the second detected flow rate is greater than the specified flow rate; The water supply device, wherein the damage identification judgment unit judges that the first check valve is damaged when the damage identification judgment unit determines that the second detected flow rate is less than the specified flow rate and the first detected flow rate is greater than the specified flow rate.

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