JP2012225548A - Heat pump type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of shortening a defrosting operation time, by increasing a defrosting heating capacity for defrosting the frost formation on an air refrigerant heat exchanger, while controlling the complication of a structure and an increase of a manufacturing cost.SOLUTION: The heat pump type water heater includes a heat pump water heater outdoor unit 1. The heat pump water heater outdoor unit 1 has: an outdoor unit water circuit where a hot water is made to flow; a compressor 2 for compressing a refrigerant; a water refrigerant heat exchanger 8 for performing a heat exchange between the refrigerant and the hot water of the outdoor unit water circuit; an air refrigerant heat exchanger 7 for performing the heat exchange between the refrigerant and the air; a blower 6 for ventilating the air refrigerant heat exchanger 7; a blower chamber 15 for housing the blower 6; and a blower chamber water pipe 46 arranged in the blower chamber 15 and connected with the outdoor unit water circuit.

Description

  The present invention relates to a heat pump type hot water supply apparatus.

  In the air-refrigerant heat exchanger, air heat is absorbed by the refrigerant, the refrigerant compressed to high temperature by the compressor is led to the water-refrigerant heat exchanger, and water is heated in this water-refrigerant heat exchanger to generate hot water. 2. Description of the Related Art A heat pump type hot water supply apparatus including a heat pump hot water supply outdoor unit is widely used. When the heat pump hot water supply outdoor unit is operated at a low outside air temperature condition, the frost formation amount of the air refrigerant heat exchanger gradually increases, and the heat exchange capacity of the air refrigerant heat exchanger with the refrigerant gradually decreases. Then, the boiling operation is interrupted and the defrosting operation is performed to defrost the air refrigerant heat exchanger. In the defrosting operation, the compressor is usually driven and the amount of refrigerant generated in the compressor is used for heating the air refrigerant heat exchanger. In the defrosting operation, the compressor is not heated and the compressor is operated. Since it is driven while using electric power, it is the cause of annual efficiency decline. Therefore, in order to suppress a decrease in annual efficiency, it is desired to increase the defrosting heating capacity while suppressing an increase in electric power required for driving the compressor and shorten the defrosting operation time.

  In Patent Document 1, a radiator is provided on the windward side of air blown by a blower fan of an air refrigerant heat exchanger, and a water pipe is connected so that water supplied before being heated by the water refrigerant heat exchanger is passed through the radiator. Thus, a heat pump type hot water supply apparatus is disclosed in which the amount of water before being heated by the water-refrigerant heat exchanger is dissipated by the radiator to perform a boiling operation while defrosting.

JP 2007-198691 A

  However, if a radiator that dissipates the heat of water is provided adjacent to the outside of the air refrigerant heat exchanger, a significant amount of piping is required, and the structure of the heat pump hot water outdoor unit becomes complicated and large. There are problems such as a significant increase in cost.

  The present invention has been made to solve the above-described problems, and increases the defrosting heating capability for defrosting the air refrigerant heat exchanger while suppressing the complexity of the structure and the increase in manufacturing cost. An object of the present invention is to provide a heat pump hot water supply apparatus that can shorten the defrosting operation time.

  A heat pump hot water supply apparatus according to the present invention is a heat pump hot water supply apparatus including a heat pump hot water supply outdoor unit, and the heat pump hot water supply outdoor unit includes an outdoor unit water circuit through which hot water flows, a compressor that compresses refrigerant, and a refrigerant. A water refrigerant heat exchanger that exchanges heat with hot water in the outdoor unit water circuit, an air refrigerant heat exchanger that exchanges heat between the refrigerant and air, a blower that blows air to the air refrigerant heat exchanger, and a blower are housed It has a fan room and a fan room water pipe provided in the fan room and connected to an outdoor unit water circuit.

  According to the present invention, an increase in the power required to drive the compressor is suppressed by utilizing the amount of heat released from the blower chamber water pipe provided in the blower chamber for the defrosting heating capacity for defrosting the air refrigerant heat exchanger. However, the defrosting heating capacity is increased, the defrosting operation time is shortened, and the annual efficiency reduction can be suppressed. In addition, it is not necessary to add a significant amount of piping, and the increase in cost can be suppressed because the structure of the heat pump hot water supply outdoor unit can be suppressed from becoming complicated and large.

It is a disassembled perspective view which shows the heat pump hot-water supply outdoor unit with which the heat pump type hot-water supply apparatus of Embodiment 1 of this invention is provided. It is a disassembled perspective view for demonstrating the installation state of the water refrigerant | coolant heat exchanger with respect to the base in a heat pump hot-water supply outdoor unit. It is a front view which shows typically the internal structure of a heat pump hot-water supply outdoor unit. It is a figure which shows a fan room water piping. It is a figure which shows the other structural example of an air blower chamber water piping. It is a circuit diagram which shows the refrigerant circuit and water circuit of the heat pump type hot water supply apparatus of Embodiment 1 of this invention. It is a circuit diagram which shows the refrigerant circuit and water circuit of the heat pump type hot-water supply apparatus of Embodiment 2 of this invention. It is a circuit diagram which shows the refrigerant circuit and water circuit of the heat pump type hot-water supply apparatus of Embodiment 3 of this invention. It is a circuit diagram which shows the refrigerant circuit and water circuit of the heat pump type hot-water supply apparatus of Embodiment 4 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 showing a heat pump hot water supply outdoor unit provided in the heat pump hot water supply apparatus according to Embodiment 1 of the present invention. First, with reference to FIG. 1, the whole structure of the heat pump hot water supply outdoor unit of this embodiment is demonstrated. In FIG. 1, the lower left is the front and the upper right is the rear.

  1 includes a base 17 serving as a bottom (base), a front surface 18, a rear surface 19, a top surface 20, a right side 21, and a left side 22. It consists of. Except the installation part of the air refrigerant heat exchanger 7, it is covered with the said housing | casing. The housing is usually formed from a sheet metal material. A partition plate 16 is provided inside the heat pump hot water supply outdoor unit 1, and the partition plate 16 divides the machine room 14 on the right side and the blower chamber 15 on the left side as viewed from the front. On the base 17 below the blower chamber 15, a water refrigerant heat exchanger 8 is installed.

Although there are some illustrations omitted in FIG. 1, a compressor 2 for compressing the refrigerant, an expansion valve 3 for decompressing the refrigerant, in the right machine room 14 separated by the partition plate 16, A refrigerant pipe such as a suction pipe 4 and a discharge pipe 5 for connecting them, and other refrigerant circuit components are incorporated. The compressor 2 incorporates a compression unit (not shown) that performs a refrigerant compression operation and a motor (not shown) that is connected to the compression unit and drives the compression unit, and is supplied from the outside. Thus, the motor and the compression unit are driven at a predetermined rotational speed. In addition, 3 to 4 vibration-proof mounts are attached to leg members attached to the lower portion of the compressor 2. The anti-vibration mount is an approximately cylindrical rubber or metal coil molded product. The anti-vibration mount is installed on the upper surface of the base 17 and elastically supports the compressor 2. A suction pipe 4 for sucking refrigerant and a discharge pipe 5 for discharging the refrigerant after being compressed inside the compressor 2 are attached to the compressor 2. The compressor 2 is connected to the refrigerant inlet portion of the water refrigerant heat exchanger 8 via the discharge pipe 5, and the refrigerant outlet portion of the water refrigerant heat exchanger 8 is connected to the inlet portion of the expansion valve 3 via the outlet side refrigerant pipe. Connected with. The expansion valve 3 has a coil member attached to the outer surface of the refrigerant flow passage main body, and operates an internal flow resistance adjustment portion by electromagnetic action generated by energizing the coil member from the outside, thereby causing the flow resistance of the refrigerant to flow. The high-pressure refrigerant on the upstream side and the low-pressure refrigerant on the downstream side of the expansion valve 3 are adjusted to a predetermined pressure. The outlet portion of the expansion valve 3 is connected to the refrigerant inlet portion of the air refrigerant heat exchanger 7 via another refrigerant pipe. 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 is sealed in the sealed space of the refrigerant circuit configured as described above, and CO ₂ refrigerant is usually used.

  The machine room 14 further incorporates components of the outdoor unit water circuit such as the first internal water pipe 24 and the second internal water pipe 25 connected to the hot water supply outlet of the water refrigerant heat exchanger 8. . A water inlet valve 29 and a hot water outlet valve 30 are provided at the lower right side of the housing. The first internal water pipe 24 is connected to a water inlet valve 29, and the second internal water pipe 25 is connected to a hot water supply outlet valve 30. Further, in order to protect the water inlet valve 29 and the hot water outlet valve 30, a service panel 23 is attached to the right side surface portion 21 of the housing.

  A blower 6 and an air refrigerant heat exchanger 7 disposed behind the blower 6 are incorporated in the left blower chamber 15 separated by the partition plate 16. The blower chamber 15 has a large space for securing an air passage. The blower 6 is a combination of a propeller blade having two to three blades and a motor that rotationally drives the propeller blade, and the propeller blade is rotated at a predetermined rotational speed by supplying electric power to the motor from the outside. It is designed to rotate. The air refrigerant heat exchanger 7 is configured by adhering a large number of aluminum thin plate fins to a long refrigerant pipe that has been reciprocally bent a plurality of times, and has a substantially flat overall shape. In this air refrigerant heat exchanger 7, heat exchange is performed between the refrigerant in the refrigerant pipe and the air around the fins, and the blower 6 increases the amount of air flowing between the fins and passing therethrough. Regulated and the amount of heat exchange is increased and adjusted.

  The electrical component storage box 9 stores electrical components such as a power supply device and a control device that drive and control operation components such as the compressor 2, the expansion valve 3, and the blower 6. The power supply device changes the rotation speed of the motor of the compressor 2 to a predetermined rotation speed of about several tens of rps (Hz) to one hundred rps (Hz), changes the opening of the expansion valve 3 to a predetermined amount, and The rotation speed of the blower 6 is controlled to be changed to a predetermined rotation speed of about several hundred rpm to 1,000 rpm. A terminal block 9a for connecting external electric wiring is provided on the right side of the electrical component storage box 9, and a service panel 23 attached to the right side surface portion 21 of the housing protects the terminal block 9a. The temperature sensor attached to the refrigerant pipe and the water pipe detects the refrigerant temperature and the water temperature at the attachment location, and transmits the detection information to the control device. The control device determines the operation content of the operation components such as the compressor 2, the expansion valve 3, and the blower 6 in the boiling operation, the defrost operation, and transmits the operation instruction content to the power supply device.

  FIG. 2 is an exploded perspective view for explaining an installation state of the water refrigerant heat exchanger 8 with respect to the base 17 in the heat pump hot water supply outdoor unit 1. The water refrigerant heat exchanger 8 is a device that heats hot water in the water circuit by the heat of the refrigerant. As shown in FIG. 2, the water-refrigerant heat exchanger 8 is housed in a foam container 12 having a substantially rectangular parallelepiped shape that is long on the left and right when viewed from the front, and is positioned below the blower 6 in the blower chamber 15. It is installed on the upper surface of the base 17 to be operated. The storage container 12 storing the water-refrigerant heat exchanger 8 is surrounded by a sheet metal storage container 10 attached to the base 17 and covered with a foam storage container lid 13. A storage lid member 11 made of a sheet metal material is installed so as to further cover the storage container lid 13.

  FIG. 3 is a front view schematically showing the internal configuration of the heat pump hot water supply outdoor unit 1. FIG. 4 is a view showing the blower chamber water pipe 41. With reference to these drawings, the blower chamber water pipe 41 provided in the blower chamber 15 will be described.

  As shown in FIG. 4, the blower chamber water pipe 41 has a shape in which a substantially U shape is inverted. As shown in FIG. 3, a motor support 46 (support member) that supports the blower 6 is installed on the storage lid member 11 in the blower chamber 15. The motor support 46 has a shape in which a plurality of (two in this embodiment) support columns are combined, and the motor of the blower 6 is fixed to the motor support 46. A blower chamber water pipe 41 is provided in the vicinity of the column of the motor support 46. The blower chamber water pipe 41 is arranged so as to extend from the lower portion to the upper portion along one support column of the motor support 46, to be folded back at the upper portion, and to return to the lower portion along the other support column. One end of the blower chamber water pipe 41 is connected to the first internal water pipe 24. The other end of the blower chamber water pipe 41 is connected to the water pipe 8 a at the water inlet of the water refrigerant heat exchanger 8. The outer diameter of the blower chamber water pipe 41 is equal to or less than the width of the column of the motor support 46. For this reason, since the blower chamber water piping 41 fits in the width | variety of the support | pillar of the motor support 46, the increase in resistance of the air flow in the blower chamber 15 can be suppressed.

  The water-refrigerant heat exchanger 8 has a configuration in which a plurality of branched refrigerant pipes 8b are closely and spirally joined to the outer periphery of one water pipe 8a, and the joint is fixed by soldering or brazing. It has become. The joint structure is bent several times so as to be housed in the substantially rectangular parallelepiped storage container 12. Heat exchange is performed between the water in the water pipe 8a and the refrigerant in the refrigerant pipe 8b.

  FIG. 6 is a circuit diagram showing a refrigerant circuit and a water circuit of the heat pump hot water supply apparatus according to Embodiment 1 of the present invention. As shown in FIG. 6, the heat pump hot water supply apparatus of the present embodiment includes the heat pump hot water supply outdoor unit 1 and the hot water storage apparatus 31 described above. The heat pump hot water supply outdoor unit 1 and the hot water storage device 31 are connected via a first external water pipe 36, a second external water pipe 37, and electrical wiring (not shown). The hot water storage device 31 includes, for example, a hot water storage tank 32 having a capacity of about several hundred liters, a water pump 33, a switching valve 35 (flow path switching means), water pipes 42, 43, 44, 45, a water pump 33, A power supply device and a control device for driving and controlling operation parts such as the switching valve 35 are provided. The water pipe 42 connects the lower part of the hot water storage tank 32 and the switching valve 35. The water pipe 43 connects the switching valve 35 and one end of the first external water pipe 36. A water pump 33 is provided in the middle of the water pipe 43. The other end of the first external water pipe 36 is connected to the first internal water pipe 24 of the heat pump hot water supply outdoor unit 1 through the water inlet valve 29 of the heat pump hot water supply outdoor unit 1. The water pipe 44 connects the upper part of the hot water storage tank 32 and the switching valve 35. The water pipe 45 connects the switching valve 35 and one end of the second external water pipe 37. The other end of the second external water pipe 37 is connected to the second internal water pipe 25 of the heat pump hot water supply outdoor unit 1 via the hot water supply outlet valve 30. The water supply pump 33 incorporates a motor for driving the water supply unit, and the motor and the water supply unit are driven at a predetermined rotational speed when power is supplied from the outside. The switching valve 35 can be switched between a switching state A and a switching state B. In the switching state A, the water pipe 42 and the water pipe 43 are connected, and the water pipe 44 and the water pipe 45 are connected. On the other hand, in the switching state B, the water pipe 43 and the water pipe 45 are connected.

  Next, the operation of the functional components in the boiling operation for increasing the amount of hot water in the hot water storage tank 32 in the hot water storage device 31 will be described. In the hot water storage device 31, the switching valve 35 is switched to the switching state A, and the water supply pump 33 is driven. In the heat pump hot water supply outdoor unit 1, the operation content is instructed from the control device stored in the electrical component storage box 9, and when the power is supplied from the power supply to the motor in the compressor 2, the motor is driven and connected to the motor. The compression unit in the compressor 2 is driven. The power supply device 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 is circulated and the flow rate of the refrigerant. Therefore, adjustment control is performed to a predetermined boiling capacity. When the operation content is instructed from the control device stored in the electrical component storage box 9 and power is supplied from the power supply device to the motor of the blower 6, the motor is driven and the propeller blades of the blower 6 connected to the motor rotate. To drive. The power supply device changes the rotational speed of the motor to several hundred rpm to about 1000 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 in by the blower 6 from behind 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 of the air refrigerant heat exchanger 7. When the operation content is instructed from the control device stored in the electrical component storage box 9 and the coil member attached to the outer surface of the refrigerant flow path body of the expansion valve 3 is energized from the power supply device, the expansion valve 3 is coiled. The flow resistance resistance of the refrigerant is adjusted by operating an internal flow resistance adjusting unit by the electromagnetic action generated in the control valve, and the upstream high-pressure and downstream low-pressure refrigerant of the expansion valve 3 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 3 are controlled according to the installation environment and use environment of the heat pump hot water supply outdoor unit 1.

  Next, the heat pump cycle action of the refrigerant in the boiling operation of the refrigerant circuit of the heat pump hot water supply outdoor unit 1 will be described. The compressor 2, the expansion valve 3, the blower 6, etc. are instructed by the control device housed in the electrical component storage box 9, driven by being supplied with power from the power supply device, and the water supply pump 33 of the hot water storage device 31, the switching valve 35, etc. Is instructed from the control device of the hot water storage device 31 and is driven by being supplied with power from the power supply device. 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 a high-temperature and high-pressure refrigerant at the compression section in the compressor 2 to increase enthalpy, and is discharged from the compressor 2 to the discharge pipe 5. The high-temperature and high-pressure refrigerant exchanges heat with 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 in the water refrigerant heat exchanger 8, lowers the temperature, and flows from the refrigerant outlet portion of the water refrigerant heat exchanger 8 into the inlet portion of the expansion valve 3. The high pressure refrigerant is depressurized to a predetermined pressure by the expansion valve 3, drops in temperature, becomes a low temperature low pressure refrigerant, and flows into the inlet of the air refrigerant heat exchanger 7 from the outlet of the expansion valve 3. The low-temperature and low-pressure refrigerant exchanges heat with air in the air refrigerant heat exchanger 7, increases the enthalpy several times the enthalpy increase in the compressor 2, flows into the suction pipe 4 from the outlet of the air refrigerant heat exchanger 7, It is sucked into the compressor 2. Thus, the refrigerant circulates and a heat pump cycle is performed. At the same time, the amount of air passing through the air refrigerant heat exchanger 7 is increased and adjusted by blowing air from the blower 6, and the amount of heat exchange between the air and the refrigerant is increased and adjusted, and the enthalpy of the refrigerant is compressed. The heat balance is almost achieved by the increase amount in the machine 2, the increase / decrease amount in the water refrigerant heat exchanger 8, and the increase amount in the air refrigerant heat exchanger 7, and the heat pump cycle is established. The switching valve 35 in the hot water storage device 31 is switched to the switching state A, and the water supply pump 33 is driven at a predetermined rotational speed. Simultaneously with the heat pump cycle of the refrigerant, low-temperature water in the lower part of the hot water storage tank 32 flows through the water pipes 42 and 43 and the first external water pipe 36 by the water supply pump 33, and the first internal water of the heat pump hot water supply outdoor unit 1. It flows into the pipe 24, flows in the blower chamber water pipe 41, flows into the water inlet of the water refrigerant heat exchanger 8, and exchanges heat with the refrigerant in the water refrigerant heat exchanger 8, and the water is about the water refrigerant heat exchanger. The enthalpy of the enthalpy of the refrigerant at 8 is increased and the enthalpy is heated and generated into hot water. The generated high temperature hot water flows into the second internal water pipe 25 from the hot water supply outlet of the water-refrigerant heat exchanger 8, flows through the second external water pipe 37 through the hot water outlet valve 30, and the water in the hot water storage device 31. It flows through the pipes 45 and 44 and is returned to the upper part of the hot water storage tank 32. Thus, water or hot water circulates in the water circuit of the heat pump hot water supply outdoor unit 1 and the water circuit of the hot water storage device 31, and the amount of hot water in the hot water storage tank 32 increases.

  Next, a defrosting operation for defrosting the frost formation of the air refrigerant heat exchanger 7 will be described. When the heat pump hot water supply outdoor unit 1 is operated under a low outside air temperature condition, the amount of frost formation in the air refrigerant heat exchanger 7 gradually increases, and the heat exchange capacity between the refrigerant and the air in the air refrigerant heat exchanger 7 gradually decreases. The boiling operation is temporarily interrupted, and the defrosting operation for defrosting the air refrigerant heat exchanger 7 is performed. The compressor 2, the expansion valve 3, the blower 6, etc. are instructed by the control device housed in the electrical component storage box 9, driven by being supplied with power from the power supply device, and the water supply pump 33 of the hot water storage device 31, the switching valve 35, etc. Is instructed from the control device of the hot water storage device 31 and is driven by being supplied with power from the power supply device. The defrosting operation control includes three processes of a first step, a second step, and a third step. In the first step immediately before the start of the defrosting operation, the compressor 2, the blower 6, and the water pump 33 are driven at a predetermined rotational speed, the expansion valve 3 is adjusted to a predetermined opening degree, and the switching valve 35 is switched to the switching state B. Make almost all the water in the water circuit hot water in a short time. Then, it transfers to a 2nd step and a defrost operation is started. In the second step, the compressor 2 is driven at a predetermined rotational speed, the expansion valve 3 is adjusted so that the refrigerant is hardly depressurized, the blower 6 is stopped, the switching valve 35 is maintained in the switching state B, and the water pump 33 Is driven at a predetermined rotational speed. The first step is continued while the temperature of the circulating hot water is equal to or higher than the predetermined temperature, and when the circulating hot water becomes lower than the predetermined temperature, the process proceeds to the second step and only the water pump 33 is stopped. The state of the first step is continued. In the second step during the defrosting operation, the refrigerant is sucked into the compressor 2 from the suction pipe 4, is compressed by the compression section in the compressor 2 to increase the enthalpy, and is discharged from the compressor 2 to the discharge pipe 5 so that the high temperature The high pressure refrigerant flows from the discharge pipe 5 into the refrigerant inlet portion of the water refrigerant heat exchanger 8. The refrigerant gives or receives heat to the hot / cold water in the water / refrigerant heat exchanger 8 or exchanges a small amount of heat, and flows into the inlet of the expansion valve 3 from the refrigerant outlet of the water / refrigerant heat exchanger 8. The high-pressure refrigerant is hardly depressurized by the expansion valve 3 and flows into the air refrigerant heat exchanger 7 inlet from the outlet of the expansion valve 3. The refrigerant gives heat to the air refrigerant heat exchanger 7 to lower the 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. In addition, the enthalpy of the refrigerant is almost balanced with the increase in the compressor 2, the increase / decrease in the water refrigerant heat exchanger 8, and the decrease in the air refrigerant heat exchanger 7, and the cycle is established. In the second step, simultaneously with the heat pump cycle of the refrigerant, high-temperature hot water flows through the water pipe 43 and the first external water pipe 36 by the water pump 33 and flows into the first internal water pipe 24, and the blower chamber water pipe 41. The hot water in the blower chamber water pipe 41 radiates heat in the blower chamber 15 and flows into the water inlet of the water-refrigerant heat exchanger 8, and the water-refrigerant heat exchanger 8 exchanges a small amount of heat with the refrigerant. Flows into the second internal water pipe 25, flows through the second external water pipe 37 through the hot water outlet valve 30, and returns to the water pump 33 through the water pipe 45, the switching valve 35, and the water pipe 43. Is circulating. In the second step, the frost formation of the air refrigerant heat exchanger 7 is defrosted by the amount of heat from the refrigerant and the amount of heat radiated from the hot water passing through the blower chamber water pipe 41 into the blower chamber 15. In the second step, since the temperature of the circulating hot water gradually decreases after the start of the defrosting operation, the process proceeds to the third step when the temperature falls below the predetermined temperature, and the water pump 33 is driven while the compressor is driven. Then, the amount of heat exchange between the hot water and the refrigerant is reduced as much as possible by the water / refrigerant heat exchanger 8. The refrigerant heat pump cycle in the third step is substantially the same as in the second step, but the frost formation of the air refrigerant heat exchanger 7 is defrosted by the amount of heat from the refrigerant. When almost all the frost on the air refrigerant heat exchanger 7 has been defrosted, the defrosting operation is terminated and the boiling operation is started. The first step immediately before the start of the above defrosting operation, the first step during the defrosting operation. Switching between the 2nd step, the 3rd step, the boiling operation, etc. is controlled in the electric component storage box 9 based on the refrigerant temperature, the water temperature, etc. detected by the temperature sensor attached to the refrigerant pipe and the water pipe. Determined by the device. Compared with a heat pump hot water supply outdoor unit in which the blower chamber water pipe 41 is not provided, the defrosting heating capacity increases in the second step, and the defrosting heating capacity becomes equal in the third step. Since the defrosting heating capacity increases by the amount, the defrosting heating capacity increases while suppressing the increase in electric power required to drive the compressor 2, so that the defrosting operation time can be shortened and the decrease in annual efficiency can be suppressed. it can. Moreover, since the blower chamber water piping 41 is provided in the blower chamber 15, it is not necessary to add a significant amount of piping, and the structure of the heat pump hot water supply outdoor unit 1 can be suppressed from becoming complicated and large in size. A significant increase can be suppressed.

  As described above, in the present embodiment, by providing the blower chamber water pipe 41, the annual efficiency is improved by increasing the defrosting heating capacity for defrosting the air refrigerant heat exchanger 7 of the heat pump hot water supply outdoor unit 1. The heat pump hot water supply outdoor unit 1 that is effective and excellent in efficiency can be obtained while suppressing an increase in cost. That is, the heat pump hot water supply outdoor unit 1 of the present embodiment is more efficient than the conventional hot water supply apparatus, can reduce power consumption, and contributes significantly to improving the efficiency.

  In the example described above, the blower chamber water pipe 41 is provided close to the support column of the motor support 46. However, the blower chamber water pipe 41 is brought into contact with or in close contact with the support column of the motor support 46, and the heat of the blower chamber water pipe 41 is increased. You may make it increase in the defrost heating capability which is transmitted to the motor support 46 and defrosts the frost formation of the air refrigerant heat exchanger 7. In this case, the blower chamber water pipe 41 and the support of the motor support 46 may be joined by welding, brazing, soldering, or the like. In the second step during the defrosting operation for defrosting the air refrigerant heat exchanger 7 by bringing the blower chamber water pipe 41 into contact with the support column of the motor support 46, the amount of hot water in the blower chamber water pipe 41 is increased. Is transmitted to the motor support 46, and the amount of heat is transmitted from the place where the motor support 46 is in contact to the air refrigerant heat exchanger 7, and the defrosting heating capacity is locally transmitted greatly, so the defrosting operation time is further reduced. The annual efficiency decline can be further suppressed.

  FIG. 5 is a diagram illustrating another configuration example of the blower chamber water pipe 41. A thin plate-like fin 41a is attached to the blower chamber water pipe 41 shown in FIG. 5 so as to increase the heat radiation amount. The plurality of fins 41a are made of, for example, an aluminum material. In the second step during the defrosting operation for defrosting the air refrigerant heat exchanger 7, the amount of hot water in the blower chamber water pipe 41 is radiated in the blower chamber 15 and used for the defrosting heating capacity. In addition, since the heat radiation amount is increased by the fins 41a and the defrosting heating capacity is further increased, it is possible to further shorten the defrosting operation time and further suppress the annual efficiency decrease.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 7 is a circuit diagram showing a refrigerant circuit and a water circuit of the heat pump hot water supply apparatus according to Embodiment 2 of the present invention.

  In the first embodiment, the water supply pump 33 is provided in the hot water storage device 31, but in this embodiment, the water supply pump 26 is provided not in the hot water storage device 31 but in the heat pump hot water supply outdoor unit 1. The heat pump hot water supply outdoor unit 1 includes a water pump 26, a water refrigerant heat exchanger 8, a blower chamber water pipe 41, first internal water pipes 24a and 24b, second internal water pipes 25a and 25b, and a switching valve. 27 (flow path switching means) and the like are incorporated. The switching valve 27 can be switched between a switching state A and a switching state B. In the switching state A, the first internal water pipe 24a and the first internal water pipe 24b are connected, and the second internal water pipe 25a and the second internal water pipe 25b are connected. On the other hand, in the switching state B, the first internal water pipe 24a and the second internal water pipe 25a are connected. The hot water storage device 31 incorporates a hot water storage tank 32, a water pipe 42 that communicates with the first external water pipe 36, a water pipe 44 that communicates with the second external water pipe 37, and the like.

  The configuration of this embodiment is almost the same as that of Embodiment 1 except that the water pump 26 and the switching valve 27 are provided not in the hot water storage device 31 but in the heat pump hot water supply outdoor unit 1. The operations in the first step immediately before the start of the defrosting operation, the second step in the defrosting operation, and the third step of the operation parts of the heat pump hot water supply outdoor unit 1 and the hot water storage device 31 are described in the first embodiment. In the switching valve 27, the flow of hot water passes through the first external water pipe 36 and the second external water pipe 37 or bypasses without passing through the water circuit of the heat pump hot water supply outdoor unit 1. Can be switched. According to the present embodiment, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 8 is a circuit diagram showing a refrigerant circuit and a water circuit of the heat pump hot water supply apparatus according to Embodiment 3 of the present invention.

  In the present embodiment, a switching valve 35 is provided in the hot water storage device 31 in the same manner as in the first embodiment, and a second switching valve 28 (bypass means) is additionally provided in the heat pump hot water outdoor unit 1 for heating operation. Suppresses the efficiency drop at the time. In the heat pump hot water supply outdoor unit 1, a water refrigerant heat exchanger 8, a blower chamber water pipe 41, first internal water pipes 24a and 24b, a second internal water pipe 25, a second switching valve 28, and the like are incorporated. ing. The structure of the heat pump hot water supply outdoor unit 1 is that the second switching valve 28 is provided and the connection state of the blower room water pipe 41 and the first internal water pipes 24a and 24b is different. 1 is almost the same. The structure of the hot water storage device 31 is substantially the same as the hot water storage device 31 of the first embodiment. The second switching valve 28 can switch between a switching state B in which the hot water flow passes through the blower chamber water piping 41 and a switching state A in which the hot water flow bypasses without passing through the blower chamber water piping 41. . In the switching state B, the first internal water pipe 24a and the first internal water pipe 24b are connected. In the switching state A, the water inlet of the water-refrigerant heat exchanger 8 and the first internal water pipe 24b are connected. During the boiling operation, the switching valve 28 is switched to the switching state A in which the hot water flow is bypassed without passing through the blower chamber water pipe 41. In the first step immediately before the start of the defrosting operation, the second step during the defrosting operation, and the third step, the switching valve 28 is switched to the switching state B in which the flow of hot water passes through the blower chamber water pipe 41. Operation of the heat pump hot water supply outdoor unit 1 and the hot water storage device 31 during the heating operation, the first step immediately before the start of the defrosting operation, the second step during the defrosting operation, and the operation in the third step are the second switching valve. Except for the operation 28, it is almost the same as the first embodiment. According to the present embodiment, in addition to the same effects as those of the first embodiment, the following effects can be further obtained. When water is flowing through the blower chamber water pipe 41 during the boiling operation, when the temperature of the water in the blower chamber water pipe 41 is lower than the ambient temperature, the amount of heat in the blower chamber water pipe 41 is the blower chamber. 15 is dissipated in heat, and the amount of heating heat decreases, resulting in a decrease in boiling efficiency. On the other hand, in this embodiment, since water is prevented from flowing in the blower chamber water pipe 41 during the boiling operation, a decrease in boiling efficiency is suppressed, and a decrease in annual efficiency can be further suppressed.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 9 is a circuit diagram showing a refrigerant circuit and a water circuit of the heat pump hot water supply apparatus according to Embodiment 4 of the present invention.

  In the third embodiment, the second switching valve 28 (bypass means) is provided on the water inlet side of the water refrigerant heat exchanger 8, but in the present embodiment, the second switching is performed on the outlet side of the water refrigerant heat exchanger 8. A valve 28 is provided. The structure of the heat pump hot water supply outdoor unit 1 is such that the second switching valve 28 is provided on the outlet side of the water refrigerant heat exchanger 8, and the blower chamber water pipe 41, the first internal water pipe 24, the second internal water pipes 25a, 25b, Except that the connection state of 25c is different, it is almost the same as the heat pump hot water supply outdoor unit 1 of the first embodiment. The structure of hot water storage device 31 is substantially the same as hot water storage device 31 of the first and third embodiments. The second switching valve 28 can switch between a switching state B in which the hot water flow passes through the blower chamber water piping 41 and a switching state A in which the hot water flow bypasses without passing through the blower chamber water piping 41. . In the switching state B, the second internal water pipe 25a and the second internal water pipe 25b are connected. In the switching state A, the second internal water pipe 25a and the second internal water pipe 25c are connected. During the boiling operation, the second switching valve 28 is switched to the switching state A in which the hot water flow is bypassed without passing through the blower chamber water pipe 41. In the first step immediately before the start of the defrosting operation, the second step during the defrosting operation, and the third step, the second switching valve 28 is switched to the switching state B in which the flow of hot water passes through the blower chamber water pipe 41. The operations of the operation parts of the heat pump hot water supply outdoor unit 1 are substantially the same as those in Embodiment 3 in the first step immediately before starting the defrosting operation, the second step in the defrosting operation, and the third step. is there. The first component immediately before the start of the defrosting operation, the second step during the defrosting operation, and the third step of the operation parts of the hot water storage device 31 are the same as those in the first and third embodiments. It is almost the same. In the present embodiment, in addition to the same effects as in the third embodiment, the following effects are further obtained. In the first step immediately before the start of the defrosting operation, since hot water (hot water) flows in the blower chamber water pipe 41 immediately after switching, the amount of hot water in the blower chamber water pipe 41 is transmitted to the motor support 46, and the motor support. Since the amount of heat is transmitted to the air-refrigerant heat exchanger 7 from the place where 46 is in contact, the defrosting heating capacity is locally transmitted greatly, and the defrosting operation time is further increased by the defrosting heating effect in the first step. It can be shortened and the annual efficiency decline can be further suppressed.

  In each embodiment described above, the blower 6 is stopped in the second step and the third step during the defrosting operation. However, the air refrigerant is supplied from the blower 6 side in the second step and the third step during the defrosting operation. You may make it drive the air blower 6 so that it may become the ventilation direction to the heat exchanger 7 side, and may further increase a defrost heating capability. That is, during the boiling operation, air is sucked from the rear of the air refrigerant heat exchanger 7 installed behind the blower 6 by the blower 6, passes through the air refrigerant heat exchanger 7, and is opposite to the air refrigerant heat exchanger 7. It is driven to be discharged to the front side. In contrast, in the second step and the third step during the defrosting operation, the blower 6 is driven so as to be in the blowing direction from the blower 6 side to the air refrigerant heat exchanger 7 side. Thereby, in the second step and the third step during the defrosting operation, the heat quantity radiated from the blower chamber water pipe 41 into the blower chamber 15 is blown to the air refrigerant heat exchanger 7 side. As a result, the defrosting heating capacity is further increased, so that the defrosting operation time can be further shortened and the annual efficiency reduction can be further suppressed.

DESCRIPTION OF SYMBOLS 1 Heat pump hot water supply outdoor unit 2 Compressor 3 Expansion valve 4 Suction pipe 5 Discharge pipe 6 Blower 7 Air refrigerant heat exchanger 8 Water refrigerant heat exchanger 8a Water pipe 8b Refrigerant pipe 9 Electrical component storage box 14 Machine room 15 Blower room 17 Base 18 Front surface portion 19 Rear surface portion 20 Upper surface portion 21 Right side surface portion 22 Left side surface portion 23 Service panels 24, 24a, 24b First internal water piping 25, 25a, 25b, 25c Second internal water piping 26, 33 Water pumps 27, 35 Switching valve 28 Second switching valve 29 Water inlet valve 30 Hot water outlet valve 31 Hot water storage device 32 Hot water storage tank 36 First external water pipe 37 Second external water pipe 41 Blower room water pipe 41a Fins 42, 43, 44, 45 Water pipe 46 Motor support

Claims (9)

A heat pump type hot water supply device equipped with a heat pump hot water supply outdoor unit,
The heat pump hot water supply outdoor unit is
An outdoor unit water circuit through which hot water flows,
A compressor for compressing the refrigerant;
A water-refrigerant heat exchanger that performs heat exchange between the refrigerant and hot water of the outdoor unit water circuit;
An air refrigerant heat exchanger for exchanging heat between the refrigerant and air;
A blower for blowing air to the air refrigerant heat exchanger;
A blower chamber that houses the blower;
A blower room water pipe provided in the blower room and connected to the outdoor unit water circuit;
A heat pump type hot water supply apparatus having Forming a combination of a plurality of struts, comprising a support member that supports the blower
The blower chamber water pipe has a portion provided along the support column,
The heat pump hot water supply apparatus according to claim 1, wherein an outer diameter of the blower chamber water pipe is equal to or less than a width of the support column. Forming a combination of a plurality of struts, comprising a support member that supports the blower
The heat pump hot water supply apparatus according to claim 1, wherein the blower chamber water pipe has a portion provided in contact with the support column.   The heat pump type hot water supply apparatus according to any one of claims 1 to 3, wherein a thin fin is attached to the blower chamber water pipe. Channel switching means capable of switching channels so that hot water heated by the water refrigerant heat exchanger can be circulated to the blower chamber water piping;
A water supply pump for supplying water so that hot water heated by the water refrigerant heat exchanger circulates in the blower chamber water pipe;
With
In at least a part of the defrosting operation for defrosting the frosting of the air refrigerant heat exchanger, the flow path switching is performed so that hot water heated by the water refrigerant heat exchanger circulates in the blower chamber water pipe. The heat pump type hot water supply apparatus according to any one of claims 1 to 4, wherein the water pump is operated by switching means. It further comprises a hot water storage device connected to the outdoor unit water circuit via an external water pipe,
The heat pump type hot water supply apparatus according to claim 5, wherein the flow path switching means and the water supply pump are provided in the hot water storage apparatus.   The heat pump hot water supply apparatus according to claim 5, wherein the flow path switching means and the water pump are provided in the heat pump hot water supply outdoor unit.   The heat pump hot water supply apparatus according to any one of claims 1 to 7, wherein the outdoor unit water circuit includes a bypass unit capable of switching a flow path so that hot water does not flow through the blower room water pipe.   The at least part of the defrosting operation for defrosting the air refrigerant heat exchanger is configured to drive the blower so as to be in a blowing direction from the blower side to the air refrigerant heat exchanger side. The heat pump hot water supply apparatus according to any one of 1 to 8.

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