JP5880123B2 - Heat pump outdoor unit - Google Patents

Description

  The present invention relates to a heat pump outdoor unit.

  An energy efficient heat pump type hot water supply system that can boil hot water by absorbing the heat of air is widely used. The heat pump hot water outdoor unit that is a component of the heat pump hot water supply system includes an air refrigerant heat exchanger that absorbs heat of air into the refrigerant, a blower that blows air to the air refrigerant heat exchanger, a compressor that compresses the refrigerant, and the heat of the refrigerant A water-refrigerant heat exchanger that heats the water is mounted, and generally has the following structure. In the heat pump hot water supply outdoor unit, a water-refrigerant heat exchanger having a large weight and a long side shape is housed in a storage box such as a foam material and installed on the upper surface of the base. A compressor is installed on the upper surface of the base via a vibration-proof mount such as a rubber member or a metal spring member. The compressor and the water refrigerant heat exchanger are connected via a refrigerant pipe, and the compressor and the water refrigerant heat exchanger are installed side by side on the upper surface of the base. Further, a water inlet valve and a hot water outlet valve to which an external water pipe for exchanging hot water with the outside is connected are provided on the side of the casing of the heat pump hot water outdoor unit. The water inlet valve and the hot water outlet valve are connected to the water / refrigerant heat exchanger through two internal water pipes for incoming and outgoing hot water inside the housing. The valve bed that supports the water inlet valve and the hot water outlet valve is fixed to the side surface of the housing (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-147620 (FIG. 3)

  In the conventional heat pump hot water supply outdoor unit as described above, the vibration of the compressor is transmitted from the refrigerant pipe to the water refrigerant heat exchanger during operation, and the vibration of the water refrigerant heat exchanger is transmitted to the valve bed via the internal water pipe. The vibration of the valve bed is transmitted from the side of the casing to each part of the casing. For this reason, vibration of each part of the housing of the heat pump hot water supply outdoor unit increases, and noise and low-frequency sound radiated from each part of the housing are likely to increase. As a countermeasure, there is a method of suppressing vibration transmission, such as interposing a buffer member when attaching the valve bed to the side of the casing, but the casing side of the valve bed when transporting or installing the heat pump hot water outdoor unit etc. There is a problem that the holding strength to the part is insufficient. In addition, as another method, in order to suppress an increase in vibration, noise, and low frequency sound, a vibration isolating member is attached to each part of the casing, a thickness of each part of the casing is increased, and a reinforcing member is attached to each part of the casing. However, there is a problem that the manufacturing cost is remarkably increased.

  The present invention has been made in order to solve the above-described problems. While suppressing an increase in manufacturing cost, the present invention suppresses vibration of each part of the casing and reduces noise and low-frequency sound radiated from each part of the casing. It aims at providing the heat pump outdoor unit which can be suppressed.

A heat pump outdoor unit according to the present invention accommodates a refrigerant circuit in which enclosed refrigerant circulates, a water refrigerant heat exchanger that performs heat exchange between the refrigerant and water or a liquid heat medium, a refrigerant circuit, and a water refrigerant heat exchanger. A connection valve that can connect a housing and an external water pipe that is an external pipe through which water or a liquid heat medium passes, a valve support member that supports the connection valve, a water refrigerant heat exchanger and a connection valve inside the housing And an internal water pipe through which water or a liquid heat medium passes, and a leg member that is provided at the bottom of the casing and supports the casing, and connects the valve support member and the leg member. The connecting portion extends substantially horizontally from the leg member and is connected to the lower end of the valve support member.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the vibration of each part of a housing | casing, suppressing the increase in manufacturing cost, and to suppress the noise and low frequency sound radiated | emitted from each part of a housing | casing.

It is a disassembled perspective view of the heat pump hot-water supply outdoor unit of Embodiment 1 of this invention. It is a disassembled perspective view which shows the installation state of the water refrigerant | coolant heat exchanger with respect to the base of the heat pump hot-water supply outdoor unit of Embodiment 1 of this invention. It is the front view and principal part enlarged view which show the internal structure of the heat pump hot-water supply outdoor unit of Embodiment 1 of this invention. It is a bottom view of the heat pump hot-water supply outdoor unit of Embodiment 1 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of a heat pump hot water supply outdoor unit according to Embodiment 1 of the present invention. In FIG. 1, the lower left is the front and the upper right is the rear. FIG. 2 is an exploded perspective view showing an installation state of the water refrigerant heat exchanger with respect to the base of the heat pump hot water supply outdoor unit according to Embodiment 1 of the present invention. FIG. 3 is a front view and an enlarged view of a main part showing the internal structure of the heat pump hot water supply outdoor unit according to Embodiment 1 of the present invention. FIG. 4 is a bottom view of the heat pump hot water supply outdoor unit according to Embodiment 1 of the present invention.

  First, the whole structure of the heat pump hot water supply outdoor unit of this embodiment is demonstrated. As shown in FIG. 1, the heat pump hot water supply outdoor unit 1 of the present embodiment has a housing that accommodates its constituent devices. This housing is configured by combining a base 17 constituting the bottom, a front left side 18a covering the front and left sides, a rear right side 18b covering the rear and right sides, and an upper surface 18c covering the top. Yes. The housing is mainly composed of a sheet metal material or the like. The heat pump hot water supply outdoor unit 1 is covered with the casing except for the installation portion of the air refrigerant heat exchanger 7. A partition plate 16 is provided inside the housing, and the partition plate 16 partitions the interior of the housing into a right-side machine chamber 14 and a left-side fan chamber 15 as viewed from the front. An electrical component storage box 9 that stores electrical components such as an inverter power source that drives and controls the compressor 2, the expansion valve, the blower 6, and the like is incorporated in the machine chamber 14 and a part of the blower chamber 15. . On the right side of the electrical component storage box 9, a terminal block 9a for connecting external electrical wiring is provided. In order to protect this terminal block 9a, the service panel 24 is attached to the right side surface portion of the rear right side surface portion 18b of the housing.

  As shown in FIG. 2, the water-refrigerant heat exchanger 8 is installed on the upper surface of the base 17 in a state where the water-refrigerant heat exchanger 8 is stored in a storage container 12 made of a foam material having heat insulation properties. The storage container 12 is surrounded by a sheet metal storage enclosure member 10 attached to the base 17, and is covered with a storage container lid 13 made of foam material, and further by a storage lid member 11 made of sheet metal material. The upper surface is covered.

  As shown in FIG. 3, in the right machine room 14 separated by the partition plate 16, a compressor 2 for compressing the refrigerant, an expansion valve (not shown) for depressurizing the refrigerant, and these The refrigerant pipes such as the suction pipe 4 and the discharge pipe 5 are connected, and other refrigerant circuit components are incorporated. A blower 6 and an air refrigerant heat exchanger 7 adjacent to the blower 6 are incorporated in the left blower chamber 15 separated by the partition plate 16. A large space is provided in the blower chamber 15 for securing an air passage. A water-refrigerant heat exchanger 8 is installed on the upper surface of the lower base 17 in the blower chamber 15.

The compressor 2 is connected to the refrigerant inlet portion of the water refrigerant heat exchanger 8 through the discharge pipe 5. The refrigerant outlet portion of the water refrigerant heat exchanger 8 is connected to the inlet portion of the expansion valve via a refrigerant pipe, and the outlet portion of the expansion valve is connected to the refrigerant inlet portion of the air refrigerant heat exchanger 7 via another refrigerant pipe. It is connected. The refrigerant outlet portion of the air refrigerant heat exchanger 7 is connected to the compressor 2 via the suction pipe 4. In addition, other refrigerant circuit components may be attached in the middle of the refrigerant pipe. A predetermined amount of refrigerant (for example, CO ₂ refrigerant) is enclosed in the sealed space of the refrigerant circuit configured as described above.

  A first leg member 21 and a second leg member 22 for supporting the heat pump hot water supply outdoor unit 1 are attached to the bottom surface of the base 17. The first leg member 21 is located on the left side and the second leg member 22 is located on the right side. When the heat pump hot water supply outdoor unit 1 is installed, the first leg member 21 and the second leg member 22 are fixed to the installation surface such as the ground, base, pedestal or the like.

  A water inlet valve 29 and a hot water outlet valve 30 are provided on the right side surface of the heat pump hot water supply outdoor unit 1 as connection valves that can connect an external water pipe (not shown) for exchanging hot water with a hot water storage device to be described later. Has been. The water inlet valve 29 and the hot water outlet valve 30 are fixed and supported by a valve bed 28 as a valve support member. In the configuration shown in the figure, both are arranged vertically so that the water inlet valve 29 is on the lower side and the hot water supply outlet valve 30 is on the upper side. In the machine room 14, the water inlet part of the water refrigerant heat exchanger 8 and the water inlet valve 29 are connected by an internal water pipe 19, and the hot water outlet part and the hot water outlet valve 30 of the water refrigerant heat exchanger 8 are connected. The space is connected by an internal water pipe 20. As shown in FIG. 3, the valve bed 28 has a flat plate shape and is positioned so as to overlap the outside of the right side surface portion of the rear right side surface portion 18b of the housing. A buffer member 23 is interposed between the valve bed 28 and the right side surface portion of the rear right side surface portion 18b of the housing. The buffer member 23 is made of an elastic material such as rubber or a flexible material, for example. As shown in FIG. 4, the valve bed 28 is connected to the second leg member 22 via a connecting portion 31. The connecting portion 31 extends substantially horizontally from the second leg member 22 toward the right side surface portion of the heat pump hot water supply outdoor unit 1 and is connected to the lower end of the valve bed 28. In the present embodiment, the valve bed 28, the connecting portion 31 and the second leg member 22 are integrally formed and integrated, but these are connected and fixed via a fixing member such as a bolt. It may be configured.

  As described above, in the present embodiment, the valve bed 28 is connected to the second leg member 22, and the valve bed 28 is directly held by the second leg member 22, so that the heat pump hot water supply outdoor unit 1 is transported. The valve bed 28 has a sufficient holding strength at the time of installation or use. As shown in FIG. 1, a service panel 27 for protecting the water inlet valve 29 and the hot water outlet valve 30 can be attached to the right side surface portion of the rear right side surface portion 18b of the housing.

  Next, the structure and function of the water refrigerant heat exchanger 8 will be described. As shown in FIG. 3, in the water-refrigerant heat exchanger 8, the refrigerant pipe 8b is tightly joined to the water pipe 8a, and heat is exchanged between the water in the water pipe 8a and the refrigerant in the refrigerant pipe 8b. ing. The water-refrigerant heat exchanger 8 is bent and molded several times so that it can be stored in the storage container 12 having a substantially rectangular parallelepiped shape with such a joint structure. From the joint end 8c between the refrigerant pipe 8b on the connection side of the discharge pipe 5 and the water pipe 8a, a water pipe in which the refrigerant pipe is not joined extends to the hot water supply outlet valve 30 to constitute the internal water pipe 20. ing. Although illustration is omitted, similarly, from the joint end 8c on the opposite side, a water pipe in a state where the refrigerant pipe is not joined extends to the water inlet valve 29 to constitute the internal water pipe 19.

  Next, functional parts other than the water refrigerant heat exchanger 8 will be described. Although not shown in detail, the compressor 2 includes a compressor that performs a refrigerant compression operation and a motor that is connected to the compressor and drives the compressor, and is supplied with power from the outside. As a result, the motor and the compression unit are driven at a predetermined rotational speed. Three to four substantially cylindrical rubber or metal coil vibration-proof mounts 3 are attached to the lower leg plate 2 a of the compressor 2, and the vibration-proof mount 3 is installed on the upper surface of the base 17 and compressed. The machine 2 is elastically supported. A suction pipe 4 for sucking refrigerant is attached to the compressor 2, and a discharge pipe 5 for discharging the refrigerant after being compressed inside the compressor 2 is attached to the compressor 2. The blower 6 is a combination of two to three propeller blades and a motor that rotationally drives the propeller blades, and the motor and the propeller blades are rotated at a predetermined number of revolutions by supplying power from the outside. The expansion valve (not shown) has a coil member attached to the outer surface of the refrigerant flow path main body, and operates an internal flow path resistance adjusting section by electromagnetic action generated by energizing the coil member from the outside to flow the refrigerant. The path resistance is adjusted, and the refrigerant upstream high pressure and refrigerant downstream low pressure of the expansion valve are adjusted to predetermined pressures. The air-refrigerant heat exchanger 7 has a substantially flat plate shape in which a large number of aluminum thin plate fins are in close contact with a long refrigerant pipe formed by reciprocating bending multiple times, and heat is generated by the refrigerant in the refrigerant pipe and the air around the fins. Exchange is performed, and the amount of air flowing through and passing through the periphery of the fins is increased by air blow by the blower 6 and adjusted, and the amount of heat exchange is increased and adjusted. The electrical component storage box 9 stores electrical components such as an inverter power source that drives and controls the compressor 2, the expansion valve, the blower 6, and the like. The inverter power source has a rotational speed of the compressor motor of several tens of rps (Hz) to The rotation speed is changed to a predetermined rotation speed of about 100 rps (Hz), the opening degree of the expansion valve is changed to a predetermined amount, and the rotation speed of the blower 6 is set to a predetermined rotation speed of about several hundred rpm to 1,000 rpm. It is controlled to change.

  Next, the combination structure of the heat pump hot water supply outdoor unit 1 and the hot water storage device will be described. The heat pump hot water supply outdoor unit 1 is used in combination with a hot water storage device (not shown). The hot water storage device incorporates a hot water storage tank having a capacity of, for example, several hundred liters, and a water supply pump that sends the water in the hot water storage tank to the outside. The inlet of the water pump is connected to a pipe connected to the lower part of the hot water storage tank. One end of the external water pipe is connected to the outlet of the water pump, and the other end of the external water pipe is connected to the water inlet valve 29 of the heat pump hot water supply outdoor unit 1. The other end of the external water pipe connected at one end to the hot water supply outlet valve 30 of the heat pump hot water supply outdoor unit 1 is connected to a pipe connected to the upper part of the hot water storage tank. The heat pump hot water supply outdoor unit 1 and the hot water storage device are connected to each other through these external water pipes and electrical wiring. In this way, the heat pump hot water supply outdoor unit 1 and the hot water storage device constitute a hot water supply circuit.

  Next, the operation of the heat pump hot water supply outdoor unit 1 in the boiling operation for increasing the amount of hot water in the hot water storage tank in the hot water storage device will be described. When power is supplied from the inverter power supply stored in the electrical component storage box 9 to the motor in the compressor 2, the motor is driven, and the compression unit in the compressor 2 connected to the motor is driven. The inverter power supply changes the rotation speed of the motor to a predetermined rotation speed of about several tens of rps (Hz) to one hundred rps (Hz), and changes the circulation speed of the heat pump cycle in which the refrigerant circulates and the flow rate of the refrigerant. Thus, adjustment control is performed to a predetermined boiling capacity. Further, when power is supplied from the inverter power supply stored in the electrical component storage box 9 to the motor of the blower 6, the motor is driven, and the propeller blades of the blower 6 connected to the motor are rotationally driven. The inverter power supply changes the rotational speed of the motor to several hundred rpm to about 1,000 rpm and changes the flow rate of the air passing through the air refrigerant heat exchanger 7, whereby the refrigerant and air in the air refrigerant heat exchanger 7 are changed. The heat exchange amount is adjusted and controlled to a predetermined amount. Air is sucked from the rear of the air refrigerant heat exchanger 7 installed behind the blower 6, passes through the air refrigerant heat exchanger 7, and is discharged to the front on the opposite side of the air refrigerant heat exchanger 7. Further, when the coil member attached to the outer surface of the refrigerant flow passage main body of the expansion valve is energized from the inverter power supply housed in the electrical component storage box 9, the flow passage resistance adjusting portion inside the refrigerant flow passage main body is operated. The flow path resistance degree of the refrigerant is adjusted, and the upstream high pressure and downstream low pressure refrigerant of the expansion valve are adjusted and controlled to a predetermined pressure. The rotation speed of the compressor 2, the rotation speed of the blower 6, and the flow path resistance of the expansion valve are controlled according to the installation environment and use environment of the heat pump hot water supply outdoor unit 1. When the compression unit in the compressor 2 is driven, the refrigerant is compressed in the compression unit, and the low-pressure refrigerant is sucked into the compressor 2 from the suction pipe 4. The low-pressure refrigerant is compressed into the high-temperature and high-pressure refrigerant at the compression unit in the compressor 2 and discharged from the compressor 2 to the discharge pipe 5. The high-temperature and high-pressure refrigerant flows from the discharge pipe 5 into the refrigerant inlet of the water-refrigerant heat exchanger 8, exchanges heat with the low-temperature water in the water-refrigerant heat exchanger 8, and heats the low-temperature water to generate high-temperature hot water. The high-temperature and high-pressure refrigerant lowers the enthalpy by the water refrigerant heat exchanger 8 to lower the temperature and flows from the refrigerant outlet portion of the water refrigerant heat exchanger 8 into the inlet portion of the expansion valve. The high-pressure refrigerant is depressurized to a predetermined pressure by the expansion valve, drops in temperature, becomes a low-temperature and low-pressure refrigerant, and flows into the inlet portion of the air refrigerant heat exchanger 7 from the outlet portion of the expansion valve. The low-temperature and low-pressure refrigerant exchanges heat with air in the air refrigerant heat exchanger 7, increases enthalpy, flows into the suction pipe 4 from the outlet of the air refrigerant heat exchanger 7, and is sucked into the compressor 2. Thus, the refrigerant circulates and a heat pump cycle is performed. At the same time, the low-temperature water in the lower part of the hot water storage tank is sent to the heat pump hot water supply outdoor unit 1 through the external water pipe by the water pump in the hot water storage device, flows into the internal water pipe 19 through the water inlet valve 29, and the water refrigerant It flows into the water inlet of the heat exchanger 8 and exchanges heat with the refrigerant in the water / refrigerant heat exchanger 8 and is heated to produce hot water. The generated hot water flows into the internal water pipe 20 from the hot water outlet of the water-refrigerant heat exchanger 8, is sent to the hot water storage device through the external water pipe via the hot water outlet valve 30, and is returned to the upper part of the hot water tank. It is. In this way, a boiling operation is performed in which the amount of hot water in the hot water storage tank is increased.

Next, the relationship between the operation of the compressor 2 and the generation of vibration, noise, and low frequency sound of the heat pump hot water supply outdoor unit 1 will be described. When the compression unit in the compressor 2 is driven and the refrigerant compression operation is performed in the compression unit, the compressor 2 has several types such as a vertical direction and a horizontal direction due to the pressure fluctuation of the refrigerant and the operation of the internal movable parts. Directional translational vibration and rotational vibration are generated, and the frequency component is an integral multiple of the rotational speed of the compressor 2, and the frequency component having a lower multiple is more likely to be generated. The vibration of the compressor is transmitted to the base 17 and each part of the casing through the vibration isolating mount 3 and the pipes by the paths exemplified in the following (A) to (E).
(A) Compressor 2 → Anti-vibration mount 3 → Base 17
(A) Compressor 2 → Suction pipe 4 → Air refrigerant heat exchanger 7 → Base 17 → Case parts (c) Compressor 2 → Discharge pipe 5 → Water refrigerant heat exchanger 8 → Base 17 → Case parts (D ) Compressor 2 → Discharge pipe 5 → Water refrigerant heat exchanger 8 → Internal water piping 19 → Water inlet valve 29 → Valve bed 28 → Rear right side 18 b of the casing → Each part of the casing (e) Compressor 2 → Discharge pipe 5 → Water-refrigerant heat exchanger 8 → Internal water piping 20 → Hot water supply outlet valve 30 → Valve bed 28 → Rear side right side 18b → Each part of the casing

  As described above, the vibration of the compressor 2 is transmitted to the base 17 and each part of the casing, and may cause vibration, noise, and low-frequency sound of the heat pump hot water outdoor unit 1. Since the internal water pipe 20 is constituted by a pipe having an outer diameter larger than that of the refrigerant pipe, the internal water pipe 20 has high rigidity and has a characteristic of easily transmitting vibrations in a wide range of frequencies. For this reason, it is common that vibration transmission through the paths (d) and (e) is a main factor of vibration, noise, and low frequency sound of the heat pump hot water supply outdoor unit 1.

  On the other hand, in the heat pump hot water supply outdoor unit 1 of this embodiment, since the valve bed 28 is connected to the second leg member 22 fixed to the installation surface such as the ground, the vibration and amplitude of the valve bed 28 are second. The leg member 22 is surely restrained. For this reason, it is possible to reliably suppress the transmission of vibrations to the respective parts of the casing through the paths (d) and (e), and to reliably generate vibrations, noises and low-frequency sounds due to the vibrations of the respective parts of the casing. Can be suppressed. As a result, measures such as attaching vibration-proofing members to each part of the chassis, increasing the thickness of each part of the chassis, and attaching reinforcing members to each part of the chassis are unnecessary or can be reduced, thus suppressing an increase in manufacturing costs. can do.

  Further, in the present embodiment, the buffer member 23 interposed between the valve bed 28 and the right side surface portion 18b of the rear surface of the housing absorbs and attenuates the vibration, so that the rear surface of the housing from the valve bed 28 is attenuated. Vibration transmission to the right side surface portion 18b can be more reliably suppressed. For this reason, the vibration of each part of a housing | casing can be suppressed more reliably, and generation | occurrence | production of the vibration by the vibration of each part of a housing | casing, noise, and a low frequency sound can be suppressed more reliably.

As described above, according to the present embodiment, vibration, noise and low frequency sound of the heat pump hot water supply outdoor unit 1 can be effectively reduced at low cost. Since the heat pump hot water supply outdoor unit 1 that supplies hot water is often operated using midnight power, the user is highly interested in late-night vibration and noise, particularly low-frequency sound. For this reason, the low frequency sound reduction effect by this embodiment contributes remarkably. In addition, when the heat pump hot water supply outdoor unit 1 uses a CO ₂ refrigerant, vibration generated in the compressor 2 is larger than that of an air conditioner using an R410A refrigerant. For this reason, the low frequency sound reduction effect by this embodiment contributes remarkably.

  In the present embodiment, the heat pump hot water outdoor unit 1 that generates hot water by heat exchange between the refrigerant and water in the water refrigerant heat exchanger 8 has been described as an example. However, the present invention is a liquid heat medium other than water. The present invention is also applicable to a heat pump outdoor unit for an air conditioner in which (for example, brine, antifreeze, etc.) and a refrigerant exchange heat with a water refrigerant heat exchanger 8.

DESCRIPTION OF SYMBOLS 1 Heat pump hot water supply outdoor unit 2 Compressor 2a Leg plate 3 Anti-vibration mount 4 Suction pipe 5 Discharge pipe 6 Blower 7 Air refrigerant heat exchanger 8 Water refrigerant heat exchanger 8a Water pipe 8b Refrigerant pipe 8c Joint end 9 Electrical component storage box 9a Terminal block 10 Storage enclosure member 11 Storage cover member 12 Storage container 13 Storage container cover 14 Machine room 15 Blower room 16 Partition plate 17 Base 18a Front left side 18b Rear right side 18c Upper surface 19, 20 Internal water piping 21 First leg member 22 Second leg member 23 Buffer member 24, 27 Service panel 28 Valve bed 29 Water inlet valve 30 Hot water outlet valve 31 Connecting portion

Claims (4)

A refrigerant circuit in which the enclosed refrigerant circulates;
A water-refrigerant heat exchanger for exchanging heat between the refrigerant and water or a liquid heat medium;
A housing for housing the refrigerant circuit and the water-refrigerant heat exchanger;
A connection valve capable of connecting an external water pipe which is an external pipe through which the water or the liquid heat medium passes;
A valve support member for supporting the connection valve;
An internal water pipe that connects between the water refrigerant heat exchanger and the connection valve inside the housing, and through which the water or the liquid heat medium passes;
A leg member provided at the bottom of the housing and supporting the housing;
With
Including a connecting portion for connecting the valve support member and the leg member;
The connecting portion is a heat pump outdoor unit that extends substantially horizontally from the leg member and is connected to the lower end of the valve support member. The heat pump outdoor unit according to claim 1, wherein a buffer member is interposed between the housing and the valve support member. The heat pump outdoor unit according to claim 2 , wherein the buffer member is made of an elastic material or a flexible material. The heat pump outdoor unit according to any one of claims 1 to 3 , wherein the valve support member and the leg member are connected via a fixing member.

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