Water supply apparatus

Abstract

To provide a water supply device for actualizing effective cooling of components while reasonably miniaturizing the whole device.SOLUTION: The water supply device includes a ventilation pipe for supplying cooling air by a cooling fan to the driver.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a water supply device. [Background technology]

[0002] A water supply device is known that includes a control panel that houses a control device and an inverter case that houses an inverter device (see, for example, Patent Document 1). In such a water supply device, the control panel and the inverter case each include heat-generating elements, but because the elements that make up the inverter device are sensitive to heat, they are placed in different locations and separated from each other to avoid being affected by the heat-generating elements of the control panel.

[0003] The pump provided below the inverter case is equipped with a cooling fan that blows air toward the underside of the inverter case to cool it. When the pump is driven, the cooling fan rotates and blows the surrounding air against the underside of the inverter case, cooling the inverter case from the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-115888 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-21129 [Patent Document 3] Japanese Patent Application Publication No. 2018-145873 Summary of the Invention [Problem to be solved by the invention]

[0005] Fig. 1 is a schematic diagram showing an embodiment of a water supply device as a comparative example. As shown in Fig. 1, water supply device 1 is a device used to supply water to buildings such as office buildings and apartment buildings, and is connected to a supply source (not shown) such as a water main or a water tank via an inlet pipe 5.

[0006] The water supply device 1 comprises a pump device and a backflow prevention device 15 arranged on the suction side of the pump device. The pump device is a combination of a pump 2 and a motor 3. The water supply device 1 comprises a plurality of pumps 2 (two in this embodiment) and a plurality of motors 3 (two in this embodiment). The number of pumps 2 and the number of motors 3 are not limited to this embodiment. The components of the water supply device 1 are housed in a cabinet 30.

[0007] The water supply device 1 includes a suction pipe 10 connected to the suction port of the pump 2, and a discharge pipe 8 connected to the discharge port of the pump 2. The suction pipe 10 includes a suction connection pipe 9 that connects the inlet pipe 5 and the backflow prevention device 15, and a suction header pipe 18 that connects the backflow prevention device 15 and the pump 2. A pipe silencer 13 is connected to the inlet pipe 5 to suppress the propagation of vibrations from the pump device.

[0008] The discharge pipe 8 includes a discharge connection pipe 27 connected to the discharge port of each pump 2, and a discharge collection pipe 34 connected to the discharge connection pipe 27. The discharge collection pipe 34 is connected to a water distribution pipe 7. The water distribution pipe 7 is connected to a water supply fixture (e.g., a faucet) located inside the building.

[0009] The water supply device 1 is equipped with a pressure tank 28 that stores a portion of the carrier liquid pressurized by the pump 2, and a flow rate detector (not shown) connected to the discharge pipe 8. When the pump device is not operating, the pressure in the water distribution pipe 7 is maintained by the pressure tank 28. The flow rate detector is a device that detects whether the flow rate of the carrier liquid is below a predetermined low flow rate (i.e., a low flow rate state).

[0010] When the flow rate detector detects a low water flow state, pressure is accumulated in the pressure tank 28 and then the operation of the pump device is stopped (low water flow stopped). On the other hand, when the pressure in the discharge pipe 8 drops to a predetermined starting pressure, the operation of the pump device is started.

[0011] The water supply device 1 is equipped with a water leakage receiver 40 arranged below the backflow prevention device 15. The water leakage receiver 40 receives the carrier liquid that leaks from the backflow prevention device 15. The carrier liquid received in the water leakage receiver 40 is discharged to the outside of the water supply device 1.

[0012] The water supply device 1 includes an electrical equipment section 21 (a control panel and an inverter case integrated together) that is composed of a control device and an inverter device. The housing 110 of the electrical equipment section 21 contains a driver 120 and a reactor 130, which are the main heat sources, and a control board 150.

[0013] Components that serve as heat sources for the control device and components that serve as heat sources for the inverter device are mixed in the housing 110. The main heat sources are the driver 120 and the reactor 130. The driver 120 has a lower temperature tolerance level than the reactor 130.

[0014] Therefore, to prevent the temperature of driver 120 from rising and breaking down due to heat generation from reactor 130, not only is cooling fan 105 blowing cooling air onto the outside of housing 110, but holes are drilled in the bottom of housing 110 at the positions where driver 120 and reactor 130 are placed, and cooling fan 105 blows cooling air directly onto driver 120 and reactor 130 inside the housing through these holes.

[0015] However, in order to efficiently utilize the cooling air from cooling fan 105, it is necessary to arrange the layout of the electronic devices and control devices inside housing 110 so that at least driver 120 (and more preferably reactor 130) is located in the axial direction of rotating shaft 100. However, when meeting the demand to reduce the size of the entire package of water supply device 1, there is a problem that such a layout cannot be achieved.

[0016] Figure 2 is a diagram showing an example of reducing the overall size of the water supply device in Figure 1 while maintaining its performance. In Figure 2, the width dimension of the water supply device 1 has been significantly reduced compared to the water supply device in Figure 1. However, in order to maintain the same performance as the conventional water supply device, the main equipment, the pump 2 and backflow prevention device 15, must be used as is, and the pipe diameter of the flow path must also be the same. For this reason, only limited areas can contribute to reducing the size, such as shortening the pipe's flow direction dimension and the electrical equipment section 21 consisting of the control device and inverter device.

[0017] Incidentally, even in the electrical equipment section 21, replacing control equipment such as the driver 120 for driving the pump 2 with parts other than those used conventionally, at the expense of maintaining the same reliability as before, is usually difficult because it is likely to cause failure, and conventional products must be used.

[0018] Therefore, to meet the demand for further miniaturization, the components inside the electrical equipment section 21, including the driver 120 and reactor 130, which are the main heat sources, must be arranged closer together. On the other hand, the volume of the housing of the electrical equipment section 21 also becomes smaller, increasing the amount of heat generated per unit volume inside the housing 110, while the external surface area of ​​the housing 110 becomes smaller, making it difficult to dissipate heat from the electrical equipment section 21. Therefore, further ingenuity is required to suppress the rise in temperature inside the housing 110 of the electrical equipment section 21.

[0019] Fig. 3 is an enlarged front view of the electrical equipment section and the pump arrangement in Fig. 2. Fig. 4 is an enlarged plan view of the electrical equipment section and the pump arrangement in Fig. 2. In these figures, the dimensions of pump 2 and the piping connected to pump 2 remain unchanged because the same equipment as in the conventional system is used to maintain performance. In other words, the distance between axis AX and axis AX remains unchanged from the conventional system.

[0020] On the other hand, since the dimensions of the housing 110 of the electrical equipment section 21 are made more compact than before, for example, the driver 120-2 on the right side in Figure 3 ends up being positioned significantly shifted to the left from the rotation axis 100 of the motor 3-2 of the corresponding right pump 2.

[0021] 4, the front side of the housing of the electrical equipment section 21 requires space A for connecting wires and for inspection, and the pump 2 also needs to be placed at the front side for inspection. As a result, the discharge connection pipe 27 of the pump 2 has to be placed at the back side of the pump 2.

[0022] Therefore, the drivers 120-1 and 120-2 are not located above the rotary shafts 100 of the motors 3-1 and 3-2, and therefore the cooling air from the cooling fans 105-1 and 105-2 does not efficiently enter the housing 110, resulting in a situation where the drivers 120-1 and 120-2 and the reactor 130 are not efficiently cooled.

[0023] The pumps 2 of the water supply device 1 are normally operated one at a time in an alternating fashion. That is, when the motor 3-1 is operating, the corresponding driver 120-1 is operating, but the motor 3-2 is not operating. Also, when the motor 3-2 is operating, the corresponding driver 120-2 is operating, but the motor 3-1 is not operating.

[0024] With this type of operation, in the positional relationship between drivers 120-1, 120-2 and motors 3-1, 3-2 shown in Figures 3 and 4, when motor 3-2 is operating, only a small portion of the cooling air generated by cooling fan 105-2 that hits bottom 111 of housing 110 and diffuses is used to cool driver 120-2.

[0025] Furthermore, because the positional relationship between motor 3-2 and driver 120-2 is farther apart than the positional relationship between motor 3-1 and driver 120-1, driver 120-1 is relatively easier to cool. Therefore, while driver 120-1 has a long lifespan, driver 120-2 is relatively difficult to cool. As a result, the lifespan of driver 120-2 is shortened, and there is a possibility that the frequency of failures will differ even though the drivers are the same parts.

[0026] Therefore, the present invention aims to provide a water supply device that can efficiently supply cooling air to the driver using a cooling fan, even if it is difficult to layout the electronic devices and control devices inside the housing so that the driver is positioned in the axial direction of the cooling fan's rotation shaft, thereby effectively cooling components such as the driver and reactor inside the housing and easily achieving miniaturization of the entire device. [Means for solving the problem]

[0027] In one aspect, a water supply device is provided, comprising: a pump; a driver as a component of an inverter device for driving the pump; a housing for accommodating the driver; a cooling fan connected to a rotating shaft of the pump; and an air duct for supplying cooling air from the cooling fan to the driver.

[0028] In one embodiment, the housing has an opening formed below the driver, and the ventilation pipe connects the cooling fan and the opening. In one aspect, the water supply device includes a heat sink attached to the underside of the driver, the opening is positioned opposite the heat sink, and the cooling fan is positioned offset from the opening rather than facing the opening. In one aspect, the ventilation pipe extends in the height direction of the water supply device.

[0029] In one aspect, the driver is not disposed on the axis of the rotation shaft, but is disposed offset from the axis. In one embodiment, the water supply device includes a heat sink attached to the back of the driver, and the ventilation pipe is positioned to supply cooling air from the cooling fan toward the heat sink. In one aspect, the ventilation pipe extends from the front side of the water supply device toward the depth side. [Effects of the Invention]

[0030] By providing a ventilation pipe for supplying cooling air from the cooling fan, the cooling fan can effectively cool the driver, which has low heat resistance, and the water supply device can be made reasonably compact. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 10 is a schematic diagram showing an embodiment of a water supply device as a comparative example. [Figure 2] 2 is a diagram showing an example of reducing the overall size of the water supply device of FIG. 1 while maintaining its performance. FIG. [Figure 3] FIG. 3 is an enlarged front view of the arrangement of the electrical equipment section and the pump in FIG. 2. [Figure 4] FIG. 3 is an enlarged plan view of the arrangement of the electrical equipment section and the pump in FIG. 2. [Figure 5] 3 is a front view showing an embodiment of a blower that blows air from a pump in the water supply apparatus described with reference to FIG. 2 to an electrical device section. FIG. [Figure 6] FIG. 10 is an enlarged view of the opening below the driver. [Figure 7] 3 is a plan view showing an embodiment of an air blower that blows air from a pump in the water supply apparatus described with reference to FIG. 2 to an electrical device section. FIG. [Figure 8] 10A and 10B are diagrams showing another embodiment of the water supply device. [Figure 9] 10A and 10B are diagrams showing another embodiment of the water supply device. [Figure 10] 10A and 10B are diagrams showing another embodiment of the water supply device. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, identical or corresponding components are designated by the same reference numerals, and duplicated descriptions will be omitted. In the multiple embodiments described below, the configuration of an embodiment that is not particularly described is the same as that of other embodiments, and therefore duplicated descriptions will be omitted.

[0033] Figure 5 is a front view showing one embodiment of an air blower that blows air from a pump in the water supply apparatus to an electrical equipment section as described with reference to Figure 2. In the following embodiments, the configuration of the water supply apparatus that is not particularly described is the same as the embodiment shown in Figures 1 to 4, and therefore detailed description thereof will be omitted.

[0034] In this embodiment, the electrical equipment section 21 includes, within the housing 110, an inverter device for driving the pump device (more specifically, motors 3-1, 3-2) at variable speeds, and a control device for controlling the operation of the pump device via the inverter device.

[0035] 5, the inverter device includes a driver 120-1 (and a driver 120-2) as a component thereof. The driver 120-1 (and the driver 120-2) is a device that receives a control signal from the control device, converts it into an electric signal, and controls the operation of the motor 3-1 (and the motor 3-2), such as the rotation speed.

[0036] 5, the pump 2 and the piping connected to the pump 2 are the same as in the conventional pumps in order to maintain performance, and so their dimensions remain unchanged. On the other hand, the dimensions of the electrical equipment section 21 are made more compact than in the conventional pumps. Therefore, the right driver 120-2 is disposed below the housing 110 of the electrical equipment section 21 and is disposed significantly to the left of the position above the rotation shaft 100 of the right motor 3-2 corresponding to the driver 120-2.

[0037] The control device includes, as one of its components, a control board 150 equipped with an electronic circuit for controlling the motor 3-1 (and the motor 3-2). In the embodiment shown in Fig. 5, the inverter device includes a driver 120-1 (and a driver 120-2) as a main component, and the control board 150 as a main component of the control device. However, the inverter device may include additional components other than the driver 120-1 (and a driver 120-2), and the control device may include additional components other than the control board 150.

[0038] The electrical equipment section 21 includes a reactor 130, which is different from the components of the inverter device, to ensure electrical stability. The reactor 130 is configured to remove high-frequency noise and stabilize the power supply to the motor 3. The driver 120-1 (and the driver 120-2) is a heat source in the inverter device and has low heat resistance. The reactor 130 is also a heat source, but has higher heat resistance than the driver 120.

[0039] The housing 110 of the electric device section 21 houses the driver 120-1 (and the driver 120-2) and the reactor 130 adjacent to each other. The housing 110 houses not only the driver 120-1 (and the driver 120-2) and the reactor 130 but also a control board 150.

[0040] The housing 110 has a box-like shape. More specifically, the housing 110 has a bottom 111 disposed opposite the pump device, a peripheral wall 112 surrounding the bottom 111, and an upper wall 114 connected to the peripheral wall 112 and disposed opposite the bottom 111.

[0041] The housing 110 has openings 113 (i.e., openings 113-1 and 113-2) formed in the bottom 111. The drivers 120-1 (and 120-2) each have a heat sink 140 attached to their lower surface, and each heat sink 140 is disposed so as to face the opening 113 formed in the bottom 111 of the housing 110 below it.

[0042] The heat sink 140 includes a base 141 that supports each driver 120-1 (and driver 120-2), and a plurality of fins 142 that extend from the base 141 toward the opening 113. The base 141 is larger than the opening 113, and is positioned above the opening 113 by a spacer 145.

[0043] In other words, the heat sink 140 is arranged with a gap formed between the base 141 and the bottom 111 by the spacer 145. In this embodiment, the heat sink 140 is connected to the bottom 111 through the spacer 145, and at least one of the multiple fins 142 may be inserted into the opening 113.

[0044] Fig. 6 is an enlarged view of the opening below the driver. Fig. 7 is a plan view showing one embodiment of the air blower that blows air from the pump in the water supply device described with reference to Fig. 2 to the electrical equipment section. In Fig. 6, space A is required for connecting and inspecting the wiring on the front side of the electrical equipment section 21 (see Fig. 4). Therefore, drivers 120-1, 120-2 are not located above the rotating shafts 100 of the motors 3-1, 3-2 of the pumps 2 that are arranged below the housing 110 of the electrical equipment section 21.

[0045] Opening 113 is provided with a generally plate-shaped attachment (adapter) 215 having a hole roughly equivalent to that of opening 113. Attachment 215 is composed of a flange portion 215a that extends from opening 113 to the outer surface of bottom 111 of housing 110 and comes into contact with bottom 111, a plate-shaped insertion guide portion 215b that rises roughly vertically from the edge of the hole in attachment 215 along the inner periphery of opening 113, and a fastening guide portion 215c that is similarly oriented roughly vertically from the edge of the hole in the attachment in the opposite direction to the direction of opening 113.

[0046] The worker inserts insertion guide portion 215b into opening 113, brings flange portion 215a into contact with the outer surface of bottom portion 111 of housing 110, and fixes attachment 215 to bottom portion 111 of housing 110. The fixing method may be screwing with fasteners 211 such as screws, welding, or, as a simple method, fixing with an adhesive.

[0047] The role of fastening guide portion 215c of attachment 215 will be described later. Similarly, attachment 215 is also attached to opening 113 below driver 120-2.

[0048] The water supply device 1 is provided with cooling fan 105-1 (and cooling fan 150-2) below the housing 110 of the electric equipment section 21, which forms an air flow that cools the driver 120-1 (and driver 120-2) (see FIG. 5). The cooling fan 105-1 (and cooling fan 150-2) is fixed to the rotating shaft 100 of the motor 3-1 (and motor 3-2), and faces the bottom 111 of the housing 110 of the electric equipment section 21.

[0049] The motor 3-1 (and the motor 3-2) are provided with finger guards 220 that protect the respective cooling fans 105-1 (and the cooling fans 150-2).

[0050] Between the cooling fan 105-1 of the motor 3-1 and the opening 113-1 below the driver 120-1, there is provided an air duct 200 that guides almost 100% of the airflow (i.e., cooling wind) generated by the cooling fan 105-1 of the motor 3-1 through the opening 113-1 to the driver 120-1 (more specifically, the heat sink 140 attached to the driver 120-1).

[0051] In addition, between the cooling fan 105-2 of the motor 3-2 and the opening 113-2 below the driver 120-2, there is provided an air duct 200 that guides almost 100% of the airflow (i.e., cooling air) generated by the cooling fan 105-2 of the motor 3-1 through the opening 113-2 to the driver 120-2 (more specifically, the heat sink 140 attached to the driver 120-2).

[0052] The ventilation pipe 200 may be made of cloth, plastic, or metal, but is preferably flexible. The ventilation pipe 200 extends in the height direction (i.e., vertical direction) of the water supply apparatus.

[0053] One end of the ventilation pipe 200 is placed over the outer periphery of the fastening guide portion 215c of the attachment 215, and is further fastened from the outside with a mounting fixture 210B such as a flexible cable tie.

[0054] The other end of ventilation duct 220 is covered by finger guard 220, and is further fastened from the outside with fixture 210A such as a flexible cable tie. If the entire periphery of finger guard 220 were covered with ventilation duct 200, cooling fan 105 would not be able to draw in outside air, so at least the area below finger guard 220 is not covered with ventilation duct 200 so that outside air can flow into cooling fan 105.

[0055] When motor 3 is driven, cooling fan 105 rotates together with rotating shaft 100. Rotating cooling fan 105 sends the air around finger guard 220 that is not covered by ventilation duct 200 into ventilation duct 200, and sends almost 100% of the air into housing 110 through opening 113 to which ventilation duct 200 is connected.

[0056] The air sent into the housing 110 through the ventilation pipe 200 by the cooling fan 105 is unheated air, so by bringing it into contact with the heat sink 140, which has a higher temperature and a larger temperature difference, it can efficiently remove heat from the heat sink 140 and cool it.

[0057] Furthermore, since almost 100% of the air sent into the housing 110 through the ventilation pipe 200 by the cooling fan 105 comes into contact with the heat sink 140, the heat sink 140 can be cooled more efficiently.

[0058] Therefore, although the driver 120 is thermally vulnerable to high temperatures, the heat generated by the driver 120 can be dissipated through the heat sink 140 to the air sent into the housing 110 through the ventilation pipe 200, so the driver 120 can be cooled reliably and efficiently.

[0059] The air that has cooled the driver 120 comes into contact with the base 141 of the heat sink 140 and changes its direction. Part of the air that has changed direction diffuses into the interior of the housing 110 through a gap formed between the base 141 and the bottom 111, and for example, the air flowing toward the reactor 130 comes into contact with the reactor 130 and cools it. The air also flows toward the control board 150, either after cooling the reactor 130 or directly, and cools the control board 150.

[0060] By subsequently directing the airflow that has cooled driver 120, which has low heat resistance, toward reactor 130, which is adjacent to driver 120 and has a relatively high temperature, reactor 130 can be cooled efficiently. Therefore, driver 120 and reactor 130, which should normally be spaced apart, can be placed close to each other inside housing 110. As a result, water supply device 1 can be made smaller.

[0061] The pumps 2 of the water supply device 1 are normally operated one at a time in an alternating fashion. That is, when the motor 3-1 is operating, the corresponding driver 120-1 is operating, but the motor 3-2 is not operating. Also, when the motor 3-2 is operating, the corresponding driver 120-2 is operating, but the motor 3-1 is not operating.

[0062] In such an operation, even if the driver 120 is not positioned on the axis AX direction of the rotating shaft 100 but is positioned offset from the axis AX direction, the opening 113 of the housing 110 directly below the driver 120 and the cooling fan 105 rotated by the rotating shaft 100 are connected by the ventilation duct 200.

[0063] Therefore, when motor 3-2 is operating, almost 100% of the cooling air generated by cooling fan 105-2 is used to cool driver 120-2, and when motor 3-1 is operating, almost 100% of the cooling air generated by cooling fan 105-1 is used to cool driver 120-1.

[0064] There are differences, such as differences in distance, between the positional relationship between motor 3-2 and driver 120-2 and the positional relationship between motor 3-1 and driver 120-1. Even in this case, ventilation ducts 200 can be used to connect openings 113 in housing 110 directly below each driver 120 to cooling fans 105 rotated by rotating shafts 100 of motors 3 corresponding to each driver 120, thereby supplying necessary and sufficient cooling air to heat sinks 140 of each driver 120.

[0065] Therefore, both drivers 120 are cooled equally and do not become too hot, and as a result, both drivers 120 have a long average lifespan and both have the same lifespan, making it easier to plan maintenance such as part replacement.

[0066] The housing 110 has a ventilation hole 115 formed in its upper portion. The ventilation hole 115 is formed in the upper portion of the peripheral wall portion 112 of the housing 110. In one embodiment, the ventilation hole 115 may be formed not only in the upper portion of the housing 110 but also throughout the entire peripheral wall portion 112 extending to the lower portion of the housing 110.

[0067] The air sent into the housing 110 through the opening 113 cools the driver 120 of the electrical equipment section 21 and the surrounding components (particularly the reactor 130 and the control board 150), and then is discharged to the outside of the housing 110 through the ventilation hole 115.

[0068] In this way, air can be sent from cooling fan 105 through ventilation duct 200 and from opening 113 formed in bottom 111 of housing 110 into the interior of housing 110. Therefore, even if the amount of heat generated inside housing 110 is the same as that of a conventional water supply device, and the external surface area is smaller than that of a conventional water supply device, it is possible to prevent an increase in the overall ambient temperature inside housing 110.

[0069] 8 to 10 are diagrams showing other embodiments of the water supply device. In the above-described embodiment, cooling fan 105 is configured to send cooling air through ventilation duct 200 to opening 113. The cooling air sent from ventilation duct 200 cools electrical equipment section 21 (more specifically, driver 120) inside housing 110 through opening 113.

[0070] In the embodiment shown in Figures 8 to 10, the cooling fan 105 is positioned to supply cooling air through the ventilation duct 200 (i.e., ventilation ducts 200-1, 200-2) toward the driver 120 (more specifically, the heat sink 140) within the housing 250.

[0071] 9 and 10, the electrical equipment section 21 includes a control board 150 disposed in the housing 110 and a driver 120 disposed in the housing 250. Although not shown, the reactor 130 may be disposed in the housing 110 or the housing 250.

[0072] Thus, in this embodiment, the water supply device 1 has two housings that house the components of the electrical equipment section 21, and the driver 120, which serves as a heat source, is arranged separately from the control board 150. In one embodiment, the water supply device 1 may have three or more housings, in which case the components of the electrical equipment section 21 are housed in each housing.

[0073] 8 to 10, the heat sink 140 is attached to the back surface of the driver 120 and faces the cabinet 30. A housing 250 that houses the driver 120 is disposed between the motor 3 and the cabinet 30.

[0074] Ventilation duct 200 connected to cooling fan 105 extends from the front side to the depth side of water supply device 1, straddling housing 250. With this arrangement, cooling fan 105 can blow cooling air through ventilation duct 200 towards heat sink 140 arranged on the back side of housing 250.

[0075] The above-described embodiments have been described for the purpose of enabling a person skilled in the art to practice the present invention. For convenience, the above-described embodiments are described with reference to device layouts that may result from downsizing from conventional layouts. However, even if downsizing from conventional layouts is not intended, the above-described embodiments and various modifications thereof would be within the skill of a person skilled in the art, and the technical concept of the present invention may be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope in accordance with the technical concept defined by the claims. [Explanation of symbols]

[0076] 1 Water supply device 2 pumps 3 motors 3-1, 3-2 Motor 5 Introductory tube 7 Water pipe 8 Discharge pipe 9 Suction connection pipe 10 Suction pipe 13 Pipe silencer 15 Backflow prevention device 18 Suction header pipe 21 Electrical Equipment Department 27 Discharge connection pipe 28 Pressure Tank 30 Cabinet 34 Discharge collecting pipe 40 Leakage catcher 100 Rotation Axis 105 Cooling fan 105-1, 105-2 Cooling fan 110 Case 111 Bottom 112 Peripheral wall section 113 Aperture 113-1,113-2 Opening 114 Upper wall 115 Ventilation hole 120 Driver 120-1,120-2 driver 130 Reactor 140 Heatsink 141 base 142 Finn 145 Spacer 150 control board 200 Ventilation pipe 200-1,200-2 Ventilation pipe 210A, 210B mounting fixture 211 Fasteners 215 Attachment 215a Flange part 215b Insertion guide part 215c Fastening guide part 220 Finger Guard 250 cabinets A Space AX axis

Claims

1. A water supply device, A pump and a driver as a component of an inverter device for driving the pump; a housing that houses the driver; a cooling fan connected to a rotating shaft of the pump; a ventilation pipe for supplying cooling air from the cooling fan to the driver.

2. the housing has an opening formed below the driver, The water supply device according to claim 1 , wherein the ventilation pipe connects the cooling fan and the opening.

3. the water supply device includes a heat sink attached to a lower surface of the driver; The opening is disposed opposite the heat sink, The water supply device according to claim 2, wherein the cooling fan is positioned so as not to face the opening but to be offset from the opening.

4. The water supply device according to claim 3, wherein the ventilation pipe extends in a height direction of the water supply device.

5. 2. The water supply device according to claim 1, wherein the driver is not disposed on the axis of the rotation shaft but is disposed offset from the axis.

6. the water supply device includes a heat sink attached to a back surface of the driver; The water supply device according to claim 1, wherein the ventilation pipe is arranged to supply cooling air from the cooling fan toward the heat sink.

7. The water supply apparatus according to claim 6, wherein the ventilation pipe extends from a front side of the water supply apparatus toward a depth side thereof.

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