Heat source device

Abstract

Even if the enclosure, including the upper panel, is formed from a metal plate with a painted surface, a way for static electricity to escape from the upper panel is ensured. [Solution] In the heat pump heat source unit 1, a metal beam member 113A is horizontally installed on the upper part of the rear surface of the upper frame 101 and the lower frame, having a protruding portion 117A that protrudes above the upper end of the rear panel 107. The upper panel 109 has hanging portions 116 on all four sides that overlap the upper part of the upper frame 101 from the outside when attached to the upper frame 101, and is painted on all sides, and the hanging portion 116A on the rear side overlaps the protruding portion 117A of the beam member 113A from the outside. A burring portion 133 is formed on the hanging portion 116A on the rear side that protrudes toward the protruding portion 117A when the upper panel 109 is attached, and a conductive fitting 120 is provided on the protruding portion 117A that contacts the burring portion 133 when the upper panel 109 is attached.

Description

Technical Field

[0001] The present disclosure relates to a heat source device used as a heat source for heating water with a heating means such as a heat pump.

Background Art

[0002] There is known a heat source device that can heat water to a predetermined temperature using a heating means such as a heat pump. For example, Patent Document 1 discloses a heat pump device in which a heat pump is housed in an exterior case and hot water supplied from a hot water storage tank can be heated via a refrigerant. The exterior case is formed by combining a rectangular parallelepiped exterior case body with an upper surface opening and a lid member that closes the upper surface opening of the exterior case body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the heat pump device as described above, static electricity generated by grounding is released. However, if the exterior case (housing) including the lid member (upper panel) is formed of a so-called color steel plate, there is no escape path for static electricity from the upper panel, which may lead to malfunction of electrical components inside the housing such as a controller.

[0005] Therefore, an object of the present disclosure is to provide a heat source device that can secure an escape path for static electricity from the upper panel even when the housing including the upper panel is formed of a metal plate painted on the entire surface.

Means for Solving the Problems

[0006] To achieve the above objective, this disclosure provides a water supply pipe for supplying water, A heating means for heating the supplied water, A hot water outlet pipe for dispensing hot water heated by the aforementioned heating means, The heating means includes a housing, The housing comprises a metal frame that is rectangular or square in plan view, a front panel that closes the front of the frame, a rear panel that closes the rear, side panels that close the left and right sides, and an upper panel that closes the top, wherein at least the upper panel is made of metal and is independently attached to the frame in a manner that allows it to be detachably mounted. On the upper part of any of the front, rear, left, or right panel mounting surfaces of the frame, a metal beam member is horizontally installed, having a projection that protrudes above the upper edge of the panel that closes the panel mounting surface when attached to the frame. The upper panel has hanging portions on all four sides that overlap the upper part of the frame from the outside when attached to the frame, and is painted over its entire surface. The hanging portions on the panel mounting surface side overlap the protruding portion of the beam member from the outside. Furthermore, the hanging portion on the panel mounting surface side is characterized in that a conductive portion is formed which protrudes toward the protruding portion when the upper panel is mounted, and the protruding portion is characterized in that a conductive portion is formed which contacts the conductive portion when the upper panel is mounted. Another aspect of the present disclosure is the above configuration, wherein the hanging portion on the panel mounting surface side is fixed to the protruding portion by a screw, and the conductive portion is a burring portion that is machined to rise from around the through hole through which the screw passes toward the protruding portion. The conductive portion is a conductive fitting that has a screw hole into which the screw is threaded and is fixed to the protruding portion, and in a screwed state the end face of the burring portion abuts against it. Another aspect of the present disclosure is characterized in that, in the above configuration, the panel mounting surface on which the beam member is installed is the rear surface of the frame, and a bracket for installing the housing is attached to the hanging portion on the rear side by the screws. [Effects of the Invention]

[0007] According to this disclosure, static electricity generated in the upper panel can be discharged from the beam member to the frame via the conductive portion on the beam member side that contacts the conductive portion on the hanging portion side. Therefore, even if the housing including the upper panel is formed from a metal plate with a painted surface, a way for static electricity from the upper panel to escape can be secured, preventing malfunctions of electrical components inside the housing, such as controllers. According to another aspect of this disclosure, in addition to the above effects, the conductive portion is a burring portion through which a screw that fixes the hanging portion passes, and the conductive portion is a conductive fitting fixed to a protruding portion and in a screw-fastened state, with the end face of the burring portion in contact with it. Therefore, when the screw-fastening work of the hanging portion is performed, the burring portion is automatically connected to the conductive fitting, and electrical connection between the upper panel and the frame can be easily achieved. According to another aspect of this disclosure, in addition to the above effects, a bracket for mounting the housing is attached to the rear hanging portion using the same screws, resulting in a rational configuration in which the bracket is attached at the same time as the screw fastening of the hanging portion. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of a hot water supply system consisting of a heat pump heat source unit and a water heater. [Figure 2] This is a front view of the heat pump heat source unit with the front panel removed. [Figure 3] This is a rear view of the heat pump heat source unit. [Figure 4] This is a disassembled perspective view showing the top of the casing with the top panel removed. [Figure 5] This is a rear view of a heat pump heat source unit. [Figure 6] This is an enlarged cross-sectional view of the section along line AA in Figure 5. [Figure 7] This is an enlarged view of the conductive metal fitting portion in Figure 6. [Figure 8] Figure 5 is an enlarged cross-sectional view of the area along the BB line. [Figure 9] This is an enlarged view of section C in Figure 7.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described based on the drawings. FIG. 1 is a schematic diagram showing a hot water supply system S including a heat pump heat source machine (hereinafter simply referred to as "heat source machine") 1 which is an example of a heat source device of the present disclosure, and a hot water supply device 70 connected to the heat source machine 1. The heat source machine 1 includes a heat pump unit 2, a tank unit 3, a tank drain pipe 4, a heat source side water supply pipe 5, a heat source side hot water pipe 6, and a heat source machine controller 7. The heat source side water supply pipe 5 is an example of the water supply pipe of the present disclosure. The heat pump unit 2 is an example of the heating means of the present disclosure. The heat source side hot water pipe 6 is an example of the hot water pipe of the present disclosure.

[0010] The heat pump unit 2 includes a compressor 10, a water heat exchanger 11, an expansion valve 12, a heat absorption part 13, and a loop-shaped circulation path 14 that connects these in series. A heat medium (for example, alternative refrigerant) can circulate through the circulation path 14. The compressor 10 compresses the heat medium absorbed by the heat absorption part 13, makes it high temperature and high pressure, and sends it to the water heat exchanger 11. The water heat exchanger 11 includes a heat side pipe 15 and a water side pipe 16. The heat side pipe 15 is incorporated into the circulation path 14. The water side pipe 16 is incorporated into a tank circulation path 28 described later. The expansion valve 12 decompresses the heat medium whose heat has been taken away by the water heat exchanger 11, makes it low temperature and low pressure, and sends it to the heat absorption part 13. The heat absorption part 13 has a fan 17 and performs heat exchange between the outside air and the heat medium.

[0011] The tank unit 3 includes a tank body 20, a forward pipe 21, and a return pipe 22. The tank body 20 can store hot water of a predetermined capacity (for example, 25 L), and is provided with a tank temperature sensor 23 for detecting the temperature of the hot water. The forward pipe 21 is connected to the lower part of the tank body 20. The forward pipe 21 is connected to the upstream end of the water side pipe 16. A pump 25, a flow switch 26 for detecting water flow, and a forward temperature sensor 27 for detecting the temperature of the hot water are provided on the forward pipe 21. The return pipe 22 is connected to the upper part of the tank body 20. The return pipe 22 is connected to the downstream end of the water-side pipe 16 of the water heat exchanger 11 of the heat pump unit 2. A return temperature sensor 24 for detecting the temperature of the hot water is provided on the return pipe 22. The forward pipe 21, the return pipe 22, and the water-side pipe 16 form a tank circulation path 28 through which the hot water in the tank body 20 circulates. A forward pipe drain pipe 29 is connected to the forward pipe 21 on the upstream side of the pump 25. A forward pipe drain plug 30 is provided at the downstream end of the forward pipe drain pipe 29.

[0012] The tank drain pipe 4 is connected to the lowermost part of the tank body 20. The tank drain pipe 4 is provided with a throttle portion 35 for flow rate control and a first solenoid valve 36 for opening and closing the flow path in order from the upstream side. A branch portion 4a is provided between the throttle portion 35 and the first solenoid valve 36, and a branch pipe 4b is connected to the branch portion 4a. A branch pipe drain plug 37 is provided at the outlet of the branch pipe 4b. The heat source side water supply pipe 5 has its upstream end connected to a water inlet 38 provided in the housing. An external water pipe (not shown) is connected to the water inlet 38. The heat source side water supply pipe 5 is provided with a pressure reducing valve 39 for adjusting the water inlet pressure to the tank body 20, a heat source side flow rate sensor 40 for detecting the water flow rate, and a heat source side inlet water temperature sensor 41 for detecting the temperature of the water from the upstream side.

[0013] The heat source side water supply pipe 5 branches into a first water supply branch pipe 42 and a second water supply branch pipe 43 on the downstream side of the heat source side inlet water temperature sensor 41. The first water supply branch pipe 42 is connected to a mixing valve 56 (described later) provided in the heat source side hot water pipe 6. The first water supply branch pipe 42 is provided with a check valve 44 and a throttle portion 45 for flow rate control. A water supply pipe drain pipe 46 is connected between the check valve 44 and the throttle portion 45. A water supply pipe drain plug 47 is provided at the downstream end of the water supply pipe drain pipe 46. The second water supply branch pipe 43 is connected to the lowermost part of the tank body 20. The second water supply branch pipe 43 is provided with a second solenoid valve 48 for opening and closing the flow path and a check valve 49 from the upstream side.

[0014] The heat source side outlet pipe 6 includes a first section pipe 55, a mixing valve 56, and a second section pipe 57. The first section pipe 55 has its upstream end connected to the top of the tank body 20 and its downstream end connected to the first inlet of the mixing valve 56. A pressure relief pipe 58 is connected to the first section pipe 55. A pressure relief valve 59 is provided in the pressure relief pipe 58. Downstream of the pressure relief pipe 58, the first section pipe 55 is equipped with an upstream temperature sensor 60 for detecting the hot water temperature at the outlet of the first section pipe 55. The mixing valve 56 is electrically operated, with the valve body motor-driven within the flow path of the T-shaped port, allowing for both switching of the flow path and adjustment of the flow path opening. The downstream end of the first water supply branch pipe 42 is connected to the second inlet of the mixing valve 56. The upstream end of the second section pipe 57 is connected to the outlet of the mixing valve 56. The second section pipe 57 is equipped with a downstream temperature sensor 61 for detecting the hot water temperature at the outlet of the second section pipe 57. A hot water outlet 62 is provided at the downstream end of the second section pipe 57.

[0015] The heat source controller 7 includes a CPU and memory connected to the CPU. The heat source controller 7 is electrically connected to the compressor 10, expansion valve 12, fan 17, and temperature sensors (not shown) located in the circulation path 14 of the heat pump unit 2. The heat source controller 7 is electrically connected to the pump 25, the first and second solenoid valves 36 and 48, and the mixing valve 56, and controls the operation of each component, while also receiving detection signals from each sensor and switch. The heat source controller 7 controls the operation of the heat pump unit 2 and the hot water supply operation in the tank body 20, based on the operation commands set by the remote control 74 (described later) and each detection signal, according to a program stored in a non-temporary computer-readable storage medium including memory connected to the CPU. Note that the first solenoid valve 36 of the tank drain pipe 4 is closed during hot water supply operation.

[0016] The water heater 70 includes a gas burner 71, a heat exchanger 72, a water heater controller 73, and a remote control 74. A water supply pipe 75 is connected to the inlet end of the heat transfer tubes of the heat exchanger 72. The upstream end of the water supply pipe 75 is connected to the hot water outlet 62 of the heat source unit 1 via a connecting pipe 76. A hot water outlet pipe 77 is connected to the outlet end of the heat exchanger 72. An external pipe 78 is connected to the downstream end of the hot water outlet pipe 77. A hot water tap 79 is provided on the external pipe 78. A bypass pipe 80 that bypasses the heat exchanger 72 is connected between the water supply pipe 75 and the hot water outlet pipe 77. Upstream of the bypass pipe 80, the water supply pipe 75 is equipped with a flow sensor 81 for detecting water flow, an inlet water temperature sensor 82 for detecting water temperature, and a water flow control valve 83 for controlling the flow rate in the water supply pipe 75. The hot water outlet pipe 77 is equipped with an outlet water temperature sensor 84 for detecting the outlet water temperature. The bypass pipe 80 is equipped with a bypass control valve 85 for controlling the bypass amount. The gas pipe supplying fuel gas to the gas burner 71 is equipped with a main valve, a proportional valve, and a main valve (none of which are shown) from the upstream side.

[0017] The water heater controller 73 consists of a CPU and memory connected to the CPU. The water heater controller 73 is electrically connected to the water volume control valve 83, the bypass control valve 85, the valves of the gas pipe and the igniter for ignition, and a fan (not shown), and controls the operation of each component, and also receives detection signals from each sensor. The water heater controller 73 controls the operation of the water heater 70 according to a program stored in a non-temporary computer-readable storage medium, including memory connected to the CPU, based on the operation commands set by the remote control 74 and each detection signal. The water heater controller 73 is electrically connected to the heat source unit controller 7, enabling them to communicate with each other. The remote control 74 allows the hot water supply system S to be controlled by switches (not shown) to perform both a heat retention operation and a hot water supply operation. The heat retention operation is the operation of the heat pump unit 2 to heat and maintain the temperature of the hot water in the tank body 20. The hot water supply operation is the operation of supplying the hot water in the tank body 20 via the water heater 70.

[0018] In the hot water supply system S configured as described above, when the heat source controller 7 receives an instruction from the remote control 74 to perform a heat retention operation for the heat pump unit 2, it activates the compressor 10 and expansion valve 12 of the heat pump unit 2 and the pump 25 of the tank unit 3. Then, in the heat pump unit 2, the heat transfer medium is compressed by the compressor 10 to become high temperature and high pressure, dissipates heat in the water heat exchanger 11, becomes low temperature and low pressure in the expansion valve 12, and circulates through the circulation path 14 while absorbing heat in the heat absorption section 13. Meanwhile, in the tank unit 3, the operation of the pump 25 causes the hot water in the tank body 20 to circulate through the tank circulation path 28. That is, the circulation repeats, with the water flowing from the supply pipe 21 through the water-side pipe 16 of the heat exchanger 11 and returning to the tank body 20 via the return pipe 22. As a result, heat exchange occurs in the heat exchanger 11 between the heat transfer medium flowing through the heat-side pipe 15 and the hot water flowing through the water-side pipe 16, heating the hot water in the tank body 20. After the hot water in the tank body 20 is heated to a high temperature (e.g., 75°C), the compressor 10 is controlled ON / OFF based on the temperature detected by the supply temperature sensor 27 to maintain a predetermined temperature (e.g., 65°C).

[0019] Then, when hot water operation is selected on the remote control 74, the heat source unit controller 7 opens the second solenoid valve 48 while keeping the first solenoid valve 36 closed, and switches the mixing valve 56 to a state where the first section pipe 55 and the second section pipe 57 are in communication. When the hot water tap 79 is opened in this state, tap water is supplied from the water inlet 38 to the heat source side water supply pipe 5. This tap water is supplied from the second water supply branch pipe 43 to the lower part of the tank body 20. Then, due to this supply pressure, the hot water in the tank body 20 is pushed out into the first section pipe 55 of the heat source side hot water outlet pipe 6, and flows through the mixing valve 56 to the second section pipe 57. The hot water flowing through the second section pipe 57 then flows through the connecting pipe 76 to the water supply pipe 75 of the water heater 70, and is discharged from the hot water tap 79 after passing through the heat exchanger 72, the hot water outlet pipe 77, and the external piping 78.

[0020] If the hot water temperature detected by the hot water temperature sensor 84 is lower than the set temperature set by the remote control 74, the water heater controller 73 opens the main valve and the main valve to ignite the gas burner 71 and heat the hot water passing through the heat exchanger 72. At the same time, based on the inlet water temperature obtained from the inlet water temperature sensor 82, it adjusts the opening of the water volume control valve 83, the bypass control valve 85, and the proportional valve to perform hot water temperature control to match the hot water temperature to the set temperature. On the other hand, if the hot water temperature is higher than the set temperature, the heat source controller 7 switches the mixing valve 56 to a state where the first section pipe 55, the second section pipe 57, and the first water supply branch pipe 42 are in communication, thereby increasing the amount of water supplied from the first water supply branch pipe 42. When the hot water tap 79 is closed and the flow sensor 81 detects that water has stopped flowing through the water heater 70, the water heater controller 73 closes the main valve and the source valve to stop the combustion of the gas burner 71.

[0021] Next, the specific structure of the heat source unit 1 will be explained. Figure 2 is a front view of the heat source unit 1, Figure 3 is a front view with the front panel removed, and Figure 4 is a rear perspective view. The housing 100 of the heat source unit 1 has a rectangular parallelepiped shape that extends vertically. However, the housing 100 is divided into a cubic frame-shaped upper frame 101 and a lower frame 102. Here, the upper frame 101 and the lower frame 102 are stacked vertically and joined together with bolts to form a single unit. The upper frame 101 and the lower frame 102 are examples of frames in this disclosure. A partition plate 103 is provided on the underside of the upper frame 101, and a bottom plate 104 and legs 105, 105 are provided on the underside of the lower frame 102. The front of the housing 100 is closed off by a front panel 106, and the rear is closed off by a rear panel 107. The left and right sides of the housing 100 are closed off by a pair of side panels 108, 108, and the top is closed off by an upper panel 109. Each panel is made of color-coated steel plate with paint applied to its surface.

[0022] In this configuration, the heat pump unit 2 is housed in the upper frame 101, and the tank unit 3 is housed in the lower frame 102. In the upper frame 101, the heat absorption unit 13 is located on the left side, with the fan 17 facing forward. To the right of the heat absorption unit 13 is the heat source controller 7. To the right of the heat source controller 7 is the water heat exchanger 11. Behind the heat source controller 7 are the compressor 10 and the expansion valve 12. In the lower frame 102, the tank body 20 is positioned on the left side. The lower part of the tank body 20 is fixed to the bottom plate 104 via a support base 110. The upper part of the tank body 20 is fixed to the partition plate 103 via an upper support bracket (not shown). The outer perimeter of the tank body 20 is covered with insulation material 111. The insulation material 111 is made of, for example, expanded polystyrene.

[0023] The supply pipe 21 is branched and connected to the tank drain pipe 4, which is connected to the center of the bottom surface of the tank body 20, and its upstream end is shared with the tank drain pipe 4. The supply pipe 21 is drawn out to the right side of the tank body 20, then drawn upward via the pump 25, passes through the partition plate 103 and enters the upper frame 101, and is connected to the lower part of the water heat exchanger 11. The return pipe 22 is connected to the right side of the tank body 20 and drawn upward, passes through the partition plate 103 and enters the upper frame 101, and is connected to the upper part of the water heat exchanger 11. As shown in Figure 5, a pipe connection section 108a is provided at the bottom of the right-side panel 108. In addition to the water inlet 38 and the hot water outlet 62, the pipe connection section 108a is provided with a drain outlet from the pressure relief pipe 58, drain plugs 30, 37, and 47, and a drain outlet from the tank drain pipe 4.

[0024] The upper frame 101 and the lower frame 102 have the same structure and are rectangular in plan view, including a pair of left and right portal frames 112, 112 and beam members 113, 113... that are installed in the left-right direction on the front and rear surfaces of the portal frames 112, 112, respectively. In the upper frame 101, one beam member 113 is installed on the upper part of each of the front and rear surfaces. In the lower frame 102, two beam members 113 are installed on the upper and lower parts of each of the front and rear surfaces. Each portal frame 112 is formed by bending an L-shaped steel plate in a cross-section into a portal shape when viewed from the side, with the apex facing outwards. As a result, each portal frame 112 has a pair of front and rear support columns 114, 114 and a front and rear upper beam 115 connecting the upper ends of the support columns 114, 114. Each beam member 113 is a strip-shaped steel plate, with both its left and right ends screwed to the left and right support columns 114, 114 of the portal frame 112, 112 from the front or rear, respectively.

[0025] The front panel 106 is screwed to the upper and lower beam members 113, 113 on the front of the upper frame 101, thereby closing off the front of the upper frame 101 and the lower frame 102. The rear panel 107 is screwed to the rear support columns 114, 114 of the left and right gate-shaped frames 112, 112 and to the rear beam member 113 (hereinafter referred to as "113A" when distinguishing between them), thereby closing the rear surfaces of the upper frame 101 and the lower frame 102. This rear surface is an example of the panel mounting surface of this disclosure. Each side panel 108 is screwed to the front and rear support columns 114, 114 and the upper beam 115 of the gate-shaped frame 112, which are opposite each other in the left-right direction, thereby closing off the left and right sides of the upper frame 101 and the lower frame 102. As shown in Figure 5, the upper panel 109 is a shallow box shape with downward-facing hanging sections 116, 116... on each of its four sides. The upper panel 109 is placed over the panel from above, with the lower ends of each hanging section 116 being secured to the upper ends of the front and rear panels 106, 107 and the side panels 108, 108, respectively.

[0026] As shown in Figure 4, the upper parts of the front and rear beam members 113, 113 of the upper frame 101 are protruding portions 117, 117 that extend along the entire length in the left-right direction and protrude upward from the upper ends of the front panel 106, rear panel 107, and side panels 108, 108. Fixing pieces 118, 118 are formed at both the left and right ends of each protruding portion 117, respectively, and abut against the inner surfaces of the left and right hanging portions 116, 116. As shown in Figure 6, the left and right hanging portions 116, 116 are screwed to the fixing pieces 118, 118, respectively. A conductive fitting 120 is screwed to the rear surface of the projection 117 (hereinafter referred to as "117A" when distinguishing it) on the rear beam member 113A. As shown in Figure 7, the conductive fitting 120 is a strip-shaped plate that extends in the left-right direction along the projection 117A, and both left and right ends are fixed to internal screw holes 121, 121 formed in the projection 117A by internal screws 122, 122, respectively. The ends of the conductive fitting 120 outside the internal screws 122, 122 on both the left and right sides are locking pieces 123, 123 that are bent forward. The locking pieces 123, 123 are locked to slits 124, 124 formed in the projection 117A, respectively, when screwed in. The conductive fitting 120 is an example of a conductive portion of this disclosure. Between the internal threads 122, 122, the central part of the conductive fitting 120 in the left-right direction is a U-shaped middle plate portion 125 that protrudes rearward in plan view. A pair of left and right external screw holes 126, 126 are formed in the middle plate portion 125. Through holes 127, 127 are formed in the protruding portion 117A in front of the external screw holes 126, 126. The external screw holes 126 are an example of screw holes formed in the conductive fitting of this disclosure.

[0027] A bracket 130 for installing the heat source unit 1 is attached to the rear hanging portion 116 (hereinafter referred to as "116A" for distinction). As shown in Figure 8, the bracket 130 is screwed to a mounting bracket 131 which is screwed to the hanging portion 116A from the rear. The external screws 132, 132 for attaching the mounting bracket 131 pass through the hanging portion 116A and are screwed into external screw holes 126, 126 provided in the middle plate portion 125 of the conductive fitting 120. At the point where the external screws 132, 132 pass through the hanging portion 116A, cylindrical burring portions 133, 133 are formed, which are machined to protrude forward. The front end surfaces of the burring portions 133, 133 are not coated with paint and, as shown in Figure 9, abut against the rear surface of the middle plate portion 125 when screwed in. In front of the external screws 132, 132 are the through holes 127, 127 of the protruding portion 117A. The external screw 132 is an example of a screw that fixes the hanging portion on the panel mounting surface side to the protruding portion in this disclosure. The burring portion 133 is an example of a conductive portion in this disclosure.

[0028] Therefore, when installing the upper panel 109, the conductive fitting 120 is first attached to the protruding portion 117A. The conductive fitting 120 is positioned by locking the left and right locking pieces 123, 123 into the slits 124, 124 of the protruding portion 117A from the rear, and then the internal screws 122, 122 are passed through the conductive fitting 120 and screwed into the internal screw holes 121, 121. Next, the upper panel 109 is placed over the upper frame 101, and the left and right hanging parts 116, 116 are screwed to the left and right fixing pieces 118, 118 of the front and rear beam members 113, 113. Then, the hanging part 116A is positioned behind the middle plate portion 125 of the conductive fitting 120, and the burring parts 133, 133 are positioned behind the left and right external screw holes 126, 126. In this state, the external screws 132, 132, which have passed through the mounting fitting 131 of the bracket 130 and the burring parts 133, 133 via washers 134, 134, are screwed into the external screw holes 126, 126 of the middle plate portion 125. As described above, the front end surfaces of the burring portions 133, 133 come into contact with the rear surface of the middle plate portion 125. Since no paint is applied to the front end surfaces of the burring portions 133, 133, the hanging portion 116A is electrically connected to the conductive fitting 120 via the burring portions 133, 133. Since the conductive fitting 120 is electrically connected to the left and right gate-shaped frames 112, 112 via the beam member 113A, static electricity generated in the upper panel 109 can be discharged to the gate-shaped frames 112, 112 via the conductive fitting 120 and the beam member 113A.

[0029] In the heat source unit 1 of the above configuration, a metal beam member 113A is horizontally installed on the upper part of the rear surfaces of the upper frame 101 and the lower frame 102, having a protruding portion 117A that protrudes above the upper end of the rear panel 107 that closes the rear surface when attached to both frames 101 and 102. On the other hand, the upper panel 109 has hanging portions 116 on all four sides that overlap the upper part of the upper frame 101 from the outside when attached to the upper frame 101, and the entire surface is painted, and the hanging portion 116A on the rear side overlaps the protruding portion 117A of the beam member 113A from the outside. Furthermore, a burring portion 133 is formed on the rear hanging portion 116A, which protrudes toward the protruding portion 117A when the upper panel 109 is installed, and a conductive fitting 120 is provided on the protruding portion 117A, which contacts the burring portion 133 when the upper panel 109 is installed. With this configuration, static electricity generated in the upper panel 109 can be discharged from the beam member 113A to the gate-type frame 112, 112 via the conductive fitting 120 to which the burring portion 133 makes contact. Therefore, even if the housing 100, including the upper panel 109, is formed from a metal plate with a painted surface, a way for static electricity from the upper panel 109 to escape can be secured, preventing malfunctions of electrical components inside the housing 100, such as the heat source controller 7.

[0030] The rear hanging portion 116A is fixed to the protruding portion 117A by an external screw 132, the conductive portion is a burring portion 133 that is machined to rise from around the through hole through which the external screw 132 passes toward the protruding portion 117A, and the conductive portion is a conductive fitting 120 that has an external screw hole 126 into which the external screw 132 is screwed and is fixed to the protruding portion 117A, with the end face of the burring portion 133 in contact when screwed in. Therefore, when screwing the hanging portion 116A with the external screw 132, the burring portion 133 is automatically connected to the conductive fitting 120, and electrical connection between the upper panel 109 and the gate-type frame 112 can be easily achieved. The panel mounting surface on which the beam member 113A is installed is the rear surface of the upper frame 101, and a bracket 130 for installing the housing 100 is attached to the hanging portion 116A on the rear side by external screws 132. Therefore, a rational configuration is achieved in which the bracket 130 is attached at the same time as the hanging portion 116A is screwed in with the external screw 132.

[0031] The following describes examples of changes to this disclosure. The burring portion that serves as the conductive part is not limited to two; it may be one or three or more. The burring portion does not have to be provided in the through hole of the screw. The conductive part may be formed not by a burring portion, but by a protrusion or a cut-out piece. In other words, the conductive part can be provided independently of the screw fastening of the hanging part. The screws used to fasten the hanging portion do not need to be the same screws used to attach the bracket. The shape of the conductive fitting that constitutes the conductive part can be changed as appropriate. The position and number of screws fastened to the protruding part of the beam member are not limited to the above configuration. A locking piece is not required. The conductive fitting may be a flat plate extending along the protruding part, without a middle plate as in the above configuration, as long as the conductive part can make contact. The conductive portion may be integrally formed with the protruding portion without using conductive fittings. In the above configuration, a conductive portion and a non-conducted portion are provided on the rear surface of the frame, but the conductive portion and non-conducted portion may also be provided on the front or side of the frame.

[0032] In the above configuration, the enclosure is divided into an upper frame and a lower frame, but it may also be a single, undivided frame that is rectangular or square in plan view. Panels other than the upper panel may be formed as a single unit, either partially or entirely. The heating method is not limited to heat pumps; water heaters and other similar devices can also be used. The tank capacity is not limited to 25L as described above; it may be increased or decreased as appropriate. However, the heat source device of this disclosure may not have a tank unit housed within its casing. In this case, the water supply pipe and the hot water outlet pipe are connected to an external tank unit, and the hot water is circulated between the tank unit and the heat source device for heating.

[0033] In a hot water supply system, either the heat source controller or the water heater controller may be omitted, and the entire hot water supply system may be controlled by a single controller. The heat exchanger of a water heater may consist of a primary heat exchanger that recovers sensible heat and a secondary heat exchanger that recovers latent heat. Alternatively, a drop-in pipe connected to the bathtub may be branched off from the hot water outlet pipe of the water heater, and a valve installed in the drop-in pipe may be used to fill the bathtub with hot water. In this case, a bath heating unit may be installed alongside the hot water supply unit so that the water in the bathtub can be reheated by the bath heating unit. The external heat source connected to the hot water outlet is not limited to a water heater. This disclosure is not limited to a hot water supply system consisting of a hot water supply device and an external heat source, but may also apply to configurations in which an external heat source is not connected to the hot water outlet. [Explanation of Symbols]

[0034] 1. Heat pump heat source unit, 2. Heat pump unit, 3. Tank unit, 4. Tank drain pipe, 5. Heat source side water supply pipe, 6. Heat source side hot water outlet pipe, 7. Heat source unit controller, 10. Compressor, 11. Water heat exchanger, 12. Expansion valve, 13. Heat absorption section, 14. Circulation path, 20. Tank, 25. Pump, 28. Tank circulation path, 36. First solenoid valve, 38. Water inlet, 42. First water supply branch pipe, 43. Second water supply branch pipe, 48. Second solenoid valve, 55. First section pipe, 56. Mixing valve, 57. Second section pipe, 62...Hot water outlet, 70...Water heater, 100...Housing, 101...Upper frame, 102...Lower frame, 103...Partition plate, 104...Bottom plate, 106...Front panel, 107...Rear panel, 108...Side panel, 109...Top panel, 112...Gate frame, 113...Beam member, 114...Support column, 116...Dangling part, 117...Protruding part, 120...Conductive fitting, 125...Middle plate section, 126...External screw hole, 130...Bracket, 131...Mounting fitting, 132...External screw, 123...Burring section, S...Hot water supply system.

Claims

1. Water supply pipes, A heating means for heating the supplied water, A hot water outlet pipe for dispensing hot water heated by the aforementioned heating means, The heating means includes a housing, The housing comprises a metal frame that is rectangular or square in plan view, a front panel that closes the front of the frame, a rear panel that closes the rear, side panels that close the left and right sides, and an upper panel that closes the top, wherein at least the upper panel is made of metal and is independently detachably mounted to the frame, On the upper part of any of the front, rear, left, or right panel mounting surfaces of the frame, a metal beam member is horizontally installed, having a projection that protrudes above the upper edge of the panel that closes the panel mounting surface when attached to the frame. The upper panel has hanging portions on all four sides that overlap the upper part of the frame from the outside when attached to the frame, and is painted over its entire surface, and the hanging portions on the panel mounting surface side overlap the protruding portion of the beam member from the outside. A heat source device wherein the hanging portion on the panel mounting surface side has a conductive portion that protrudes toward the protruding portion when the upper panel is mounted, and the protruding portion has a conductive portion that comes into contact with the conductive portion when the upper panel is mounted.

2. The hanging portion on the panel mounting surface side is fixed to the protruding portion by a screw, and the conductive portion is a burring portion that is machined to rise from around the through hole through which the screw passes toward the protruding portion. The heat source device according to claim 1, wherein the conductive portion is a conductive fitting having a screw hole into which the screw is screwed and fixed to the protruding portion, and the end face of the burring portion abuts against it when the screw is fastened.

3. The heat source device according to claim 1 or 2, wherein the panel mounting surface on which the beam member is installed is the rear surface of the frame, and a bracket for mounting the housing is attached to the hanging portion on the rear side by the screws.

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