WO2007114187A1

WO2007114187A1 - Heat pump hot water supplier

Info

Publication number: WO2007114187A1
Application number: PCT/JP2007/056711
Authority: WO
Inventors: Shinichi Sakamoto
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-03-31
Filing date: 2007-03-28
Publication date: 2007-10-11
Also published as: EP2009371B1; EP2009371A4; JP2007271211A; EP2009371A1

Abstract

A heat pump hot water supplier where surplus refrigerant is not produced in a refrigerant circuit, thereby a shortage of suction gas in a rotary compressor is prevented, and where an occurrence of noise near the compressor is suppressed. A refrigerating apparatus (1) has the compressor (21), a first heat exchanger (22), an expansion mechanism (23), a second heat exchanger (24), and a muffler (26). The compressor is of a rotary type and is used to compress the refrigerant. The first heat exchanger exchanges heat between a first fluid and the high-temperature high-pressure refrigerant compressed by the compressor. The expansion mechanism reduces the pressure of the refrigerant condensed in the first heat exchanger. The second heat exchanger exchanges heat between a second fluid and the refrigerant reduced in pressure by the expansion mechanism. The muffler is disposed between the second heat exchanger and the compressor and reduces the pulsation of the flow of the refrigerant.

Description

Specification

Heat pump water heater

Technical field

[0001] The present invention relates to a refrigeration apparatus including a rotary compressor (including a swing type).

Background art

Conventionally, in a technique such as Patent Document 1, in a refrigeration apparatus in which a rotary compressor, a condenser, a pressure reducing mechanism, and an evaporator are sequentially connected, between the evaporator and the suction side of the compressor. Use a configuration that installs an accumulator.

Patent Document 1: JP 2003-247490 A

Disclosure of the invention

Problems to be solved by the invention

[0003] However, as in Patent Document 1, if a liquid storage mechanism such as an accumulator is provided, the compressor runs short of intake gas or wasteful refrigerant is required.

It is an object of the present invention to prevent a shortage of suction gas in a compressor and to suppress noise generation in the vicinity of a rotary compressor by preventing excessive refrigerant from being generated in the refrigerant circuit.

Means for solving the problem

[0004] A refrigeration apparatus according to a first invention includes a compressor, a first heat exchanger, an expansion mechanism, a second heat exchanger, and a muffler. The compressor is a rotary compressor that compresses a refrigerant. In the first heat exchange, the high-temperature and high-pressure refrigerant compressed by the compressor exchanges heat with the first fluid. The expansion mechanism depressurizes the refrigerant condensed in the first heat exchanger. The second heat exchanger causes the refrigerant decompressed by the expansion mechanism to exchange heat with the second fluid. The muffler is disposed between the second heat exchanger and the compressor to reduce the pulsation of the refrigerant flow.

Conventionally, in a refrigeration apparatus such as a natural refrigerant heat pump type electric water heater, an accumulator is arranged on the suction side of a rotary type (including a swing type) compressor. However, if a liquid storage mechanism such as an accumulator is provided, the compressor may run out of suction gas or wasteful refrigerant may be required. Therefore, in the present invention, by installing a muffler that does not have a refrigerant liquid reservoir function in place of the accumulator, it is possible to prevent excessive refrigerant from being generated in the refrigerant circuit, and to prevent shortage of suction gas in the compressor. . In addition, noise generation near the rotary compressor can be suppressed.

[0005] A refrigeration apparatus according to a second aspect of the present invention is the refrigeration apparatus according to the first aspect of the present invention, wherein the muffler is disposed on the side of the compressor and fixed so as to be integrated with the side wall portion of the compressor. .

In this refrigeration apparatus, the vibration of the compressor can be suppressed by fixing the muffler and the compressor so as to be integrated. For this reason, noise generation in the compressor can be suppressed.

[0006] A refrigeration apparatus according to a third aspect of the present invention is the refrigeration apparatus according to the first or second aspect of the present invention, wherein the muffler has a muffler main body part and a filter part. The muffler body has a cylindrical shape having a channel cross-sectional area larger than the channel cross-sectional area of the gas refrigerant pipe connecting the second heat exchanger and the compressor. The filter part is supported inside the muffler main body part and collects foreign matters in the refrigerant flowing toward the second heat exchange compressor.

In this refrigeration apparatus, the filter unit provided inside the muffler main body also collects foreign matter in the refrigerant that flows toward the compressor in the second heat exchanger. In addition, since the muffler main body portion provided with the filter portion has a flow passage cross-sectional area larger than the flow passage cross-sectional area of the gas refrigerant pipe, the flow passage cross-sectional area of the filter portion can be widened. .

For this reason, it can prevent that the foreign material in a refrigerant | coolant circulates in the inside of a refrigerant circuit, and can prevent that the damage of each apparatus or the capability fall of each apparatus is caused by a foreign material. Moreover, the increase in the pressure loss in the filter part can be suppressed.

[0007] A refrigeration apparatus according to a fourth aspect of the present invention is the refrigeration apparatus according to any of the first to third aspects of the present invention, wherein the muffler supplies low-pressure gas refrigerant that has also flowed out of the second heat exchanger power to the upper part of the muffler. And let it flow out to the lower force compressor of the muffler.

In this refrigeration system, the muffler is arranged vertically so as to take in the low-pressure gas refrigerant from the upper part and to flow out from the lower part to the compressor.

Therefore, even when the liquid refrigerant is mixed into the gas refrigerant and flows into the muffler at low outside air temperature, the liquid refrigerant does not easily accumulate and is filled in the refrigerant circuit. Can be used efficiently. For this reason, the shortage of intake gas in the compressor can be suppressed, and the refrigerant used can be reduced.

[0008] A refrigeration apparatus according to a fifth aspect of the present invention is the refrigeration apparatus according to any of the first to fourth aspects of the present invention, further comprising liquid-gas heat exchange. Liquid gas heat exchange exchanges heat between the liquid refrigerant that flows out of the first heat exchanger and flows into the expansion mechanism, and the gas refrigerant that flows out of the second heat exchanger and flows into the compressor.

In this refrigeration apparatus, by providing a liquid gas heat exchanger, the refrigerant gas sent to the compressor can be overheated to prevent wet compression or liquid compression. As a result, an abnormal increase in the internal pressure of the compressor can be suppressed, and damage to the compressor can be prevented. In addition, the generation of flash gas in the liquid refrigerant pipe can be prevented by increasing the degree of supercooling of the liquid refrigerant sent to the evaporator. Thereby, the fall of the capability of an expansion mechanism can be prevented.

[0009] A refrigeration apparatus according to a sixth invention is the refrigeration apparatus according to any of the first to fifth inventions, wherein the first fluid is water, and the first heat exchange is for exchanging heat between the refrigerant and water. It is a heat exchange for hot water supply that heats water by heating.

In this refrigeration system, hot water supply heat exchange is used as the first heat exchange, and heat is exchanged between the refrigerant and water to heat the water and obtain hot water.

Therefore, the refrigeration apparatus can prevent excessive refrigerant from being generated in the refrigerant circuit even in the case of the heat pump unit of the heat pump water heater, and can prevent shortage of intake gas in the compressor. Moreover, noise generation near the compressor can be suppressed.

The invention's effect

[0010] In the refrigeration apparatus according to the first aspect of the invention, by installing a muffler that does not have a refrigerant liquid storage function instead of the accumulator, it is possible to prevent excessive refrigerant from being generated in the refrigerant circuit, and the intake gas of the compressor is insufficient. Can be prevented. In addition, noise generation in the vicinity of the rotary compressor can be suppressed.

In the refrigeration apparatus according to the second aspect of the present invention, the vibration of the compressor can be suppressed by fixing the muffler and the compressor so as to be integrated. For this reason, noise generation in the compressor can be suppressed.

In the refrigeration apparatus according to the third aspect of the invention, the foreign matter in the refrigerant is prevented from circulating in the refrigerant circuit. It is possible to prevent damage to each device or a decrease in the performance of each device from a foreign object. Moreover, an increase in pressure loss in the filter portion can be suppressed.

[0011] In the refrigeration apparatus according to the fourth aspect of the invention, even when the liquid refrigerant is mixed into the gas refrigerant and flows into the muffler at a low outside air temperature, the liquid refrigerant does not easily accumulate, The refrigerant filled in the path can be used efficiently. For this reason, the shortage of the suction gas of the compressor can be suppressed, and the refrigerant used can be reduced.

In the refrigeration apparatus according to the fifth aspect of the invention, by providing the liquid gas heat exchanger, the refrigerant gas sent to the compressor can be overheated to prevent wet compression or liquid compression. As a result, an abnormal increase in the internal pressure of the compressor can be suppressed, and damage to the compressor can be prevented. In addition, the generation of flash gas in the liquid refrigerant pipe can be prevented by increasing the degree of supercooling of the liquid refrigerant sent to the evaporator. This prevents a decrease in the capacity of the expansion mechanism.

In the refrigeration apparatus according to the sixth aspect of the invention, the refrigeration apparatus can prevent excessive refrigerant from being generated in the refrigerant circuit even in the case of a heat pump unit of a heat pump water heater, and can prevent a shortage of suction gas in the compressor. In addition, noise generation near the compressor can be suppressed.

Brief Description of Drawings

FIG. 1 is a schematic circuit diagram of a circuit configuration of a heat pump water heater that works in one embodiment of the present invention.

[Fig. 2] Control block diagram of heat pump water heater.

FIG. 3 is a schematic plan view showing an operating state of the swing type compressor.

FIG. 4 (a) is a front view showing a state where the compressor and the muffler are fixed.

FIG. 4 (b) is a plan view of FIG. 4 (a).

FIG. 5 is a schematic plan view of a rotary compressor that works on a modification (2).

Explanation of symbols

[0013] 1 Heat pump water heater (refrigeration system)

21 Compressor

22 Water heat exchanger (1st heat exchanger, heat exchanger for hot water supply) 23 Electric expansion valve (expansion mechanism)

24 Evaporator (second heat exchanger)

25 Liquid gas heat exchange

26 Muffler

26a Muffler body (muffler body)

26b Filter (filter part)

29 Gas refrigerant pipe

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a heat pump water heater 1 according to the present invention will be described based on the drawings.

FIG. 1 is a schematic configuration diagram of a heat pump water heater 1 according to an embodiment of the present invention. The heat pump water heater 1 is a device that heats tap water and supplies hot water to a household bathtub or the like by performing a vapor compression refrigeration cycle operation using C02 refrigerant. The heat pump water heater 1 mainly includes a hot water storage unit 3 having a hot water storage tank 31 for storing hot water, and a heat pump unit 2 having a refrigerant circuit 20! /.

(1) Hot water storage unit

The hot water storage unit 3 is mainly composed of a hot water storage tank 31, a circulation pump 32, and a three-way valve 39.

[0015] The hot water storage tank 31 has a water supply port 33 on the bottom wall and a hot water outlet 34 on the upper wall. The hot water storage tank 31 is supplied with tap water from the water supply port 33 and can discharge hot hot water stored in the hot water storage tank 31 from the hot water outlet 34 and supply it to a bathtub or the like. A water supply channel 38 for supplying tap water is connected to the water supply port 33. In addition, a water intake port 35 is opened on the bottom wall of the hot water storage tank 31, and a hot water supply port 36 is opened on the upper part of the side wall (peripheral wall). The intake port 35 and the hot water supply port 36 are connected to the circulation path 6, and the circulation path 32 is connected to a circulation pump 32 and a hydrothermal exchange 22 of the heat pump unit 2 described later.

The circulation pump 32 is connected in the vicinity of the water intake 35 of the hot water storage tank 31. Further, a water heat exchanger 22 is connected to the discharge side of the circulation pump 32. Circulation pump 32 is hot water storage Unheated water in the tank 31 is taken out from the water outlet 35 to the circulation path 6, and unheated water flows into the heat exchange path 61 in the hydrothermal exchange 22. Unheated water that has flowed into the water heat exchanger 22 is heated in the heat exchange path 61 in the hydrothermal exchanger, and returned to the hot water storage tank 31 from the hot water supply port 36.

The three-way valve 39 is provided on the hot water supply port 36 side in the circulation path 6 and is connected to a bypass flow path 62 connected to a water return port 37 provided on the bottom wall of the hot water storage tank 31. For this reason, in this embodiment, hot water does not flow through the bypass flow path 62, but water (hot water) that has entered the circulation path 6 from the intake port 35 flows through the circulation path 6 and returns from the hot water supply port 36 to the hot water storage tank 31. Normal operation and water intake 35 Water (warm water) that entered the circulation path 6 flows through the circulation path 6, passes through the bypass passage 62 through the three-way valve 39, and returns to the hot water storage tank 31 from the return port 37. Bypass operation can be performed.

In addition, the hot water storage tank 31 has a remaining hot water (50L) temperature sensor 残 6, a remaining hot water (100L) temperature sensor Τ7, and a remaining hot water temperature sensor that detects the temperature of hot water in each layer in the hot water storage tank 31 at a pitch of 50L from the top in the vertical direction. A hot water (150L) temperature sensor Τ8 and a remaining hot water (200L) temperature sensor Τ9 are provided. A water supply temperature sensor T10 for detecting the water supply temperature is provided at the bottom of the hot water storage tank 31. In this embodiment, the remaining hot water (50L) temperature sensor Τ6, the remaining hot water (100L) temperature sensor Τ7, the remaining hot water (150L) temperature sensor Τ8, the remaining hot water (200L) temperature sensor Τ9, and the feed water temperature sensor T10 are the thermistor. It becomes mosquito.

[0017] (2) Heat pump unit

The heat pump unit 2 is installed outdoors and has a refrigerant circuit 20. The refrigerant circuit 20 mainly includes a compressor 21, a hydrothermal exchange 22 constituting a heat exchange path 61, an electric expansion valve 23 as an expansion mechanism, an evaporator 24, a liquid gas heat exchange, and a muffler 26. , Are connected in order.

The compressor 21 is a compressor whose operating capacity can be varied. In this embodiment, the compressor 21 is a swing type compressor driven by a motor whose rotation speed is controlled by an inverter. The swing type compressor is a kind of rotary type compressor. Details of the swing compressor will be described later.

Hydrothermal heat exchange 22 is a heat exchange functioning as a refrigerant condenser. Hydrothermal exchange 22 The high-temperature and high-pressure gas refrigerant compressed in the compressor 21 is condensed by exchanging heat with unheated water sent from the circulation pump 32 (heating the unheated water). The water heat exchanger 22 has a gas side connected to the discharge side of the compressor 21 and a liquid side connected to the electric expansion valve 23.

The electric expansion valve 23 is connected to the liquid side of the evaporator 24, and adjusts the pressure and flow rate of the refrigerant flowing in the evaporator 24.

The evaporator 24 is a fin-and-tube heat exchanger of cross fin type composed of heat transfer tubes and a large number of fins. It exchanges heat with outdoor air and evaporates the incoming liquid refrigerant. Let

The liquid-gas heat exchange is provided with a liquid refrigerant passage 25a through which the liquid refrigerant flowing out of the hydrothermal exchange passes and a gas refrigerant passage 25b through which the gas refrigerant flowing out of the evaporator 24 passes, and flows out of the hydrothermal exchange 22. Heat exchange is performed between the liquid refrigerant and the gas refrigerant flowing out of the evaporator 24. That is, in the liquid gas heat exchanger 25, the liquid refrigerant passage 25a constitutes a part of the liquid refrigerant pipe 28 connecting the water heat exchanger 22 and the electric expansion valve 23, and the gas refrigerant passage 25b is compressed with the evaporator 24. A part of the gas refrigerant pipe 29 connecting the machine 21 is formed. Liquid-gas heat exchange is performed by exchanging heat between the high-pressure refrigerant that flows out of the water heat exchanger 22 and flows into the electric expansion valve 23, and the low-pressure refrigerant that flows out of the evaporator 24 and flows into the compressor. Supercooling can be imparted to the refrigerant that has flowed out of the heat exchange, and the refrigerant flowing into the compressor 21 can be heated to approach an overheated state. For this reason, the degree of supercooling of the liquid refrigerant sent to the evaporator 24 can be increased, and the generation of flash gas in the liquid refrigerant pipe 28 can be prevented. Further, the compressor 21 can be prevented from being wet-compressed, thereby enabling stable operation.

[0019] The heat pump unit 2 serves as a blower fan for sucking outdoor air into the unit, exchanging heat with the refrigerant in the evaporator 24, and then discharging the air after heat exchange to the outside. Outdoor fan 27. This outdoor fan 27 is a fan capable of varying the air volume Wo of air supplied to the evaporator 24. In this embodiment, the outdoor fan 27a is driven by an outdoor fan motor 27a that also serves as a DC fan motor and an outdoor fan motor 27a. Propeller fan 27b.

The muffler 26 is connected between the liquid gas heat exchange 25 and the suction side of the compressor 21, This is a device for reducing the pulsation of the refrigerant flow. Further, the muffler 26 secures the gas refrigerant sucked by the compressor 21, thereby preventing the compressor 21 from running out of the sucked gas and improving the volumetric efficiency of the compressor 21. The configuration of the muffler 26 will be described later.

In addition, the heat pump unit 2 is provided with various sensors. Specifically, the heat pump unit 2 includes a discharge temperature sensor Tl for detecting the discharge temperature of the compressor 21, an HPS 40 as a pressure protection switch, and the temperature of the refrigerant flowing in the evaporator 24 (that is, the evaporation temperature). An evaporation temperature sensor T2 for detecting the corresponding refrigerant temperature) and an outside air temperature sensor 3 for detecting the temperature of the outdoor air flowing into the unit are provided. In addition, the circulation path 6 is provided with a tapping temperature sensor T4 on the downstream side of the heat exchange path 61 (specifically, between the hydrothermal exchange and the three-way valve), and on the upstream side of the heat exchange path 61 (specifically, Specifically, an incoming water temperature sensor T5 is provided between the circulation pump 32 and the water heat exchanger 22). In this embodiment, the discharge temperature sensor Tl, the evaporation temperature sensor Τ2, the outside air temperature sensor Τ3, the hot water temperature sensor Τ4, and the incoming water temperature sensor Τ5 are also thermistors.

In the present embodiment, the control unit 7 is configured using, for example, a microcomputer having a CPU, a memory, an input / output interface, and the like. Further, as shown in FIG. 2, the control unit 7 is connected so that it can receive detection signals of various sensors T1 to T10, 40, and various devices and valves 21 based on these detection signals. , 23, 27, 32, 39 can be controlled.

(Α) Swing type compressor

FIG. 3 is a schematic plan view of a swing type compressor according to an embodiment of the present invention. The compressor 21 is used as a compressor of a refrigeration apparatus that uses C02 refrigerant. The compressor 21 has a piston 44 in which a substantially cylindrical roller 42 and a blade 43 protruding outward in the radial direction of the roller 42 are integrally formed. The roller 42 is fitted in an eccentric portion 45 formed integrally with the drive shaft 41. The piston 44 is housed in a cylinder chamber 48 formed in the cylinder 46 and having a substantially circular cross section. A bush fitting hole 47 is formed in the cylinder 46 in contact with the cylinder chamber 48, and a substantially semi-cylindrical bush 49 is fitted in the bush fitting hole 47. The bush 49 has the flat surfaces of the bush 49 facing each other, The both sides of the blade 43 of the piston 44 are slidably sandwiched by the flat surface of the bush 49. The cylinder chamber 48 is divided into two chambers by the piston 44. In FIG. 3 (b), in the chamber on the right side of the blade 43, the suction port 50 opens to the inner peripheral surface of the cylinder chamber 48, and the suction chamber 51 Is forming. On the other hand, in FIG. 3B, in the chamber on the left side of the blade 43, a discharge port (not shown) opens on the inner peripheral surface of the cylinder chamber 48 to form a discharge chamber 52.

Next, the operation of the compressor 21 will be described based on FIGS. 3 (a) to 3 (d). First, from the state shown in FIG. 3 (a), the eccentric part 45 rotates eccentrically around the drive shaft 41, and the roller 42 fitted to the eccentric part 45 makes the outer peripheral surface of the roller 42 the inner periphery of the cylinder chamber 48. Revolves in contact with the surface. In a normal case, the compressor 21 is disposed horizontally and the roller 42 revolves in a horizontal plane. As the roller 42 revolves in the cylinder chamber 48, the blade 43 moves forward and backward while being held by the bushes 49 on both sides. Then, while suctioning low-pressure gas refrigerant from the suction port 50 (see FIG. 3 (b)), it is compressed to high pressure in the discharge chamber 52 and discharged from a discharge port (not shown). c) to (a)). Synthetic oil as a lubricating oil is mixed in the high-pressure gas refrigerant, and when the compressor 21 performs a compression operation, the sliding surface inside the compressor 21 (for example, the inner peripheral surface of the roller 42 and the eccentric portion 45 (Outer peripheral surface, outer peripheral surface of roller 42, inner peripheral surface of cylinder chamber 48, etc.) Force Lubricated with lubricating oil mixed in refrigerant.

[0023] (B) Muffler

The muffler 26 includes a muffler body 26a and a filter 26b. The muffler body 26a also has a cylindrical part force having a pipe inner diameter larger than the pipe inner diameter of the gas refrigerant pipe 29. As shown in FIG. 4, the muffler 26 provided on the side of the compressor 21 has an inlet pipe 12 attached above the muffler body 26a and an outlet pipe 13 attached below. The inlet pipe 12 and the outlet pipe 13 are part of the gas refrigerant pipe 29. A hemispherical filter 26b that passes through the muffler body 26a is attached between the inlet pipe 12 and the outlet pipe 13. The outer shape of the filter 26b when viewed from above coincides with the inner diameter of the muffler body 26a. Further, the filter 26b collects foreign matters in the refrigerant that flows from the evaporator 24 side to the compressor 21 side. Here, the gas refrigerant flows from the inlet pipe 12 above the muffler 26, passes through the filter 26 b, removes foreign matter, and flows from the outlet pipe 13 below the muffler 26 to the suction side of the compressor 21.

Further, the muffler 26 is fixed so as to be integrated with the side wall portion of the compressor 21 main body. Specifically, the mounting bracket 10, which is also a plate material bent in a substantially U shape when viewed from above, is welded at its middle to the outer peripheral surface of the compressor 21 body. Has been fixed. Both ends of the mounting bracket 10 protrude from the main body of the compressor 21 and expand in an arc shape. A screw mounting portion 10a is formed at one end thereof, and a system joint hole 10b is formed at the other end. Yes. On the other hand, around the muffler body 26a of the muffler 26, an elongated plate-like fastening band 11 having a metal force is wound, one end of which is engaged with the system fitting hole 10b of the mounting bracket 10, and the other end is attached. The screw 14 is attached to the screw mounting portion 10a of the mounting bracket 10. Then, the fastening band 11 is pulled to the mounting bracket 10 by fastening the mounting screw 14, and the muffler body 26a is fixed to the compressor 21 body with the muffler body 26a being sandwiched between the fastening band 11 and the mounting bracket 10. . In other words, the muffler 26 is supported by the mounting bracket 10 and the outlet pipe 13 so as to be integrated with the main body of the compressor 21 at two upper and lower positions.

[0025] <Operation of heat pump water heater>

(1) Operation of heat pump unit

First, the compressor 21 is driven and the circulation pump 32 is driven.

On the refrigerant circuit 20 side, the low-pressure gas refrigerant sucked into the compressor 21 is compressed to become a high-pressure gas refrigerant. Thereafter, the high-pressure gas refrigerant is sent to the hydrothermal exchange, and is condensed by exchanging heat with unheated water supplied by the circulation pump 32 to become a high-pressure liquid refrigerant. Then, the high-pressure liquid refrigerant flows into the liquid-gas heat exchange, and is further cooled by exchanging heat with the gas refrigerant evaporated in the evaporator 24, and enters a supercooled state. The supercooled high-pressure liquid refrigerant is depressurized by the electric expansion valve 23 to near the suction pressure of the compressor 21 and is sent to the evaporator 24 as a low-pressure gas-liquid two-phase refrigerant. Heat is exchanged with the outdoor air supplied by the outdoor fan 27 in the evaporator 24 km, and evaporates to become a low-pressure gas refrigerant.

[0026] Then, the low-pressure gas refrigerant flows into the liquid gas heat exchange, is further heated by exchanging heat with the liquid refrigerant condensed in the hydrothermal exchange, and becomes overheated. The low-pressure gas refrigerant flows into the muffler 26, and the low-pressure gas refrigerant that has flowed into the muffler 26 is again sucked into the compressor 21. (2) Operation of tank unit

On the hot water storage tank 31 and the circulation path 6 side, the stored water flows out from the intake 35 provided at the bottom of the hot water storage tank 31, and this flows through the heat exchange path 61 of the circulation path 6. In this way, the unheated water flowing through the heat exchange path 61 of the circulation path 6 is heated by the hydrothermal exchange functioning as a condenser (boiling), and the hot water inlet through the three-way valve 39. The water is returned from 36 to the upper part of the hot water storage tank 31. By continuing such an operation, hot hot water is supplied to the hot water storage tank 31!

By the way, when the hot water temperature sensor 出 4 detects that the boiling temperature is equal to or lower than the predetermined temperature, the control unit 7 receives the control signal, and the hot water in the circulation path 6 circulates in the bypass flow path 62. Switch the three-way valve 39 to ring. That is, the control unit 7 performs binos operation when the boiling temperature is equal to or lower than the predetermined temperature, and returns the low temperature hot water below the predetermined temperature from the hot water supply port 36 to the hot water storage tank 31 without returning it to the water return port 37. To return to hot water storage tank 31. When the boiling temperature is low, the low-temperature water (hot water) is returned to the lower side of the hot water storage tank 31 so that it is not mixed with the hot hot water at the upper part of the hot water storage tank 31. When the boiling temperature exceeds a predetermined temperature, the control unit 7 switches the three-way valve 39 so that the normal operation state in which the bypass channel 62 is not circulated is performed. In other words, the hot water having a high temperature is returned to the hot water storage tank 31 through the hot water supply port 36, and the hot water in the upper part of the hot water storage tank 31 is maintained at a high temperature.

[0028] Further, the control unit 7 receives data from the various temperature sensors Τ1 to Τ10, and performs various controls based on these data. For example, the opening degree of the electric expansion valve 23 is adjusted so that the boiling temperature detected by the tapping temperature sensor Τ4 becomes the target boiling temperature. If the temperature of the incoming water temperature sensor Τ5 is equal to or higher than the predetermined temperature, the operation is stopped because the hot water in the hot water storage tank 31 is boiling up, or the compressor 21 is operated based on the temperature of the outside air temperature sensor Τ3. The hot water heating capacity is adjusted by controlling the operation frequency.

(1)

This heat pump water heater 1 does not have a refrigerant liquid reservoir function instead of an accumulator. By installing the muffler 26, it is possible to prevent excessive refrigerant from being generated in the refrigerant circuit 20, and it is possible to prevent the compressor 21 from running out of suction gas. Moreover, noise generation in the vicinity of the compressor 21 can be suppressed.

[0029] (2)

In this heat pump water heater 1, vibration of the compressor 21 can be suppressed by fixing the muffler 26 and the compressor 21 so as to be integrated. For this reason, noise generation in the compressor 21 can be suppressed.

(3)

In the heat pump water heater 1, foreign matter in the refrigerant that flows while the evaporator 24 force is also directed toward the compressor 21 is collected by a filter 26 b provided inside the muffler body 26 a. In addition, the muffler body 26a provided with the filter 26b has a flow passage cross-sectional area larger than the flow passage cross-sectional area of the inlet pipe 12, so that the flow passage cross-sectional area of the filter 26b can be widened. .

[0030] For this reason, it is possible to prevent foreign matters in the refrigerant from circulating in the refrigerant circuit 20, and it is possible to prevent damage to each device or a decrease in the performance of each device from being caused by the foreign matter. Further, an increase in pressure loss in the filter 26b can be suppressed.

(Four)

In this heat pump water heater 1, the muffler 26 is arranged vertically and takes in a low-pressure gas refrigerant from the upper part and flows it out to the lower force compressor 21.

For this reason, even when the liquid refrigerant is mixed into the gas refrigerant and flows into the muffler 26 at a low outside temperature, the liquid refrigerant does not collect easily and is filled in the refrigerant circuit 20. The refrigerant can be used efficiently. For this reason, a shortage of intake gas in the compressor 21 can be suppressed, and the refrigerant used can be reduced.

[0031] (5)

In this heat pump water heater 1, by providing liquid gas heat exchange, the refrigerant gas sent to the compressor 21 can be overheated to prevent wet compression or liquid compression. Thus, an abnormal increase in the internal pressure of the compressor 21 can be suppressed, and damage to the compressor 21 can be prevented. In addition, by increasing the degree of supercooling of the liquid refrigerant sent to the evaporator 24, the liquid refrigerant The generation of flash gas in the tube 28 can be prevented. Thereby, the fall of the capability of the electric expansion valve 23 can be prevented.

(6)

In this heat pump water heater 1, the water heat exchanger 22 is used as the first heat exchanger, and water is heated by heat exchange between the refrigerant and the water to obtain hot water.

Therefore, even in the case of such a heat pump water heater 1, excess refrigerant can be removed from the refrigerant circuit 20, and a shortage of intake gas in the compressor 21 can be prevented. In addition, noise generation in the vicinity of the compressor 21 can be suppressed.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

(1)

In the above-described embodiment, the heat pump water heater is used as the refrigeration apparatus. However, the refrigeration apparatus is not limited to this, and may be an air conditioner such as a multi-type air conditioner, a room air conditioner, or a central air conditioner.

[0033] (2)

In the above embodiment, the swing type compressor 21 in which the roller 42 and the blade 43 are integrally formed is used. However, as shown in FIG. 5, the vane 43a and the roller 42a corresponding to the blade are Separately, the drive shaft is driven with the vane 43a urged toward the roller 42a by the spring 53 provided in the vane groove 47a and the tip always in contact with the outer peripheral surface of the roller 42. It may be a rotary type compressor configured to advance and retreat in the vane groove 47a with the rotation of 41.

(3)

In the above embodiment, the hot water storage tank 31 is provided. However, in normal boiling operation, unheated water flows into the heat exchange path 61 constituted by the hydrothermal exchanger 22, and this heat exchange path If it is heated as it flows through 61 and high-temperature water flows out of this heat exchange path 61, it does not have a hot water storage tank 31!

[0034] (4) In the above embodiment, the temperature detecting means is a thermistor, but the temperature detecting means is not limited to the thermistor.

(Five)

In the above embodiment, carbon dioxide gas is used as the refrigerant to be used. However, the refrigerant is not limited to carbon dioxide gas, and may be a supercritical refrigerant such as ethylene, ethane, or acid-nitrogen. Use refrigerants such as dichlorodifluoromethane (R-12) and chlorodifluoromethane (R-22) that are not used in critical conditions.

Industrial applicability

The refrigerating apparatus according to the present invention can suppress the intake gas shortage of the compressor and the generation of noise in the vicinity of the compressor, and is useful as a refrigerating apparatus including a rotary compressor (including a swing type).

Claims

The scope of the claims

[1] A rotary compressor (21) that compresses the refrigerant;

A first heat exchange (22) for exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor and the first fluid;

An expansion mechanism (23) for decompressing the refrigerant condensed in the first heat exchanger; a second heat exchange (24) for exchanging heat between the refrigerant decompressed by the expansion mechanism and a second fluid;

A muffler (26) disposed between the second heat exchanger ^^ and the compressor to reduce pulsation of the refrigerant flow;

A refrigeration apparatus comprising (1).

[2] The muffler is disposed on a side of the compressor and fixed so as to be integrated with a side wall portion of the compressor.

The refrigeration apparatus (1) according to claim 1.

[3] The muffler is

A cylindrical muffler main body (26a) having a flow path cross-sectional area larger than the flow cross-sectional area of the gas refrigerant pipe (29) connecting the second heat exchanger and the compressor;

A filter unit (26b) that is supported inside the muffler main body and collects foreign substances in the refrigerant flowing from the second heat exchanger toward the compressor;

Having

The refrigeration apparatus (1) according to claim 1 or 2.

[4] The muffler takes in the low-pressure gas refrigerant that has flowed out of the second heat exchange from the upper part of the muffler, and causes the lower part of the muffler to flow out to the compressor.

The refrigeration apparatus (1) according to any one of claims 1 to 3.

[5] Liquid gas that exchanges heat between the liquid refrigerant that flows out of the first heat exchanger and flows into the expansion mechanism, and the gas refrigerant that flows out of the second heat exchanger and flows into the compressor Heat exchange

(25)

The refrigeration apparatus (1) according to any one of claims 1 to 4.

[6] The first fluid is water, The first heat exchanger is a hot water supply heat exchanger that heats the water by exchanging heat between the refrigerant and the water.

The refrigeration apparatus (1) according to claim 1, wherein the refrigeration apparatus (1).