JP2010024913A - Compressor and heat pump type water heater using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently cool a motor by a coolant circulating in a motor even if the temperature of a delivery coolant of a compressor becomes high. <P>SOLUTION: Since the coolant before circulating in the motor 5 of the compressor 1 is cooled by carrying out heat exchange between hot water supply water of a hot water supply circuit and the coolant delivered from a compressing mechanism 3 of the compressor 1 by a heat exchanger 6 in the compressor 1, even if the temperature of the delivery coolant of the compressor 1 becomes high in hot water supply operation of the winter season, the temperature of the coolant delivered from the compressing mechanism 3 is lowered and the motor 5 can be sufficiently cooled, and deterioration of efficiency of the motor can be effectively suppressed. Since even a temperature of lubricating oil A in a compressor body 2 can be lowered by lowering the temperature of the delivery coolant in the compressor body 2, viscosity of the lubricating oil A is improved, sealing performance of the compressing mechanism 3 can be improved, and performance (volumetric efficiency) of the compressing mechanism 3 can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a compressor used in, for example, a heat pump circuit for a hot water supply apparatus and a heat pump hot water supply apparatus using the compressor.

  Conventionally, this type of heat pump type hot water supply apparatus includes a heat pump circuit that circulates refrigerant discharged from a compressor to a water heat exchanger (gas cooler), then circulates to an evaporator via an expansion valve, and sucks it into the compressor. A hot water supply circuit for heating the hot water supply water by the refrigerant of the heat pump circuit by circulating the hot water supply water to the water heat exchanger by a pump, and a hot water storage tank for storing hot water for the hot water supply circuit heated by the heat pump circuit, A hot water supply water stored in a tank is known to be heated to a predetermined temperature (see, for example, Patent Document 1).

The compressor used in the hot water supply device includes a compressor main body having a refrigerant suction port and a refrigerant discharge port, a compression mechanism for compressing refrigerant sucked into the compressor main body from the refrigerant suction port, and a drive of the compression mechanism. And a motor that cools the motor with the refrigerant by circulating the refrigerant discharged from the compression mechanism to the motor, and then discharges the refrigerant to the outside from the refrigerant discharge port of the compressor body. (For example, refer to Patent Document 2).
JP 2008-20147 A JP 2008-95520 A

  However, in the heat pump circuit of the hot water supply device, the temperature of the refrigerant discharged from the compressor in the hot water supply operation in the winter season becomes high, so that the motor is insufficiently cooled by the refrigerant discharged from the compression mechanism in the compressor. There was a problem of lowering.

  The present invention has been made in view of the above problems, and the object of the present invention is to sufficiently cool the motor by the refrigerant flowing through the motor even when the temperature of the refrigerant discharged from the compression mechanism becomes high. An object of the present invention is to provide a compressor that can be used and a heat pump type hot water supply apparatus using the compressor.

  In order to achieve the above object, the present invention provides a compressor main body having a refrigerant suction port and a refrigerant discharge port, a compression mechanism that compresses refrigerant sucked into the compressor main body from the refrigerant suction port, and a motor that drives the compression mechanism. A compressor that cools the motor by circulating the refrigerant discharged from the compression mechanism to the motor and discharges the refrigerant to the outside from the refrigerant discharge port of the compressor main body. And a heat exchanger that cools the refrigerant before flowing through the motor by exchanging heat between the predetermined fluid heated by the refrigerant discharged to the outside from the compressor body and the refrigerant discharged from the compression mechanism. .

  Thereby, even when the temperature of the discharged refrigerant becomes high, the temperature of the refrigerant discharged from the compression mechanism is lowered by the heat exchanger, so that the motor is sufficiently cooled by the refrigerant flowing through the motor. In this case, the temperature of the lubricating oil in the compressor body also decreases due to a decrease in the temperature of the discharged refrigerant in the compressor body.

  In order to achieve the above object, the present invention provides a heat pump circuit that circulates refrigerant discharged from a compressor to a water heat exchanger, then circulates to an evaporator via an expansion valve, and sucks it into the compressor. The hot water storage tank is provided with a hot water supply circuit that heats hot water supply water by the refrigerant of the heat pump circuit by circulating the water to the water heat exchanger by a pump, and a hot water storage tank that stores hot water supply water of the hot water supply circuit heated by the heat pump circuit. A heat pump type hot water supply apparatus configured to heat stored hot water supply water to a predetermined temperature, wherein the compressor includes the compressor according to claim 1, and the hot water supply water of the hot water supply circuit heated by the heat pump circuit is used as heat of the compressor. It is configured to be distributed to the exchanger.

  Thus, for example, even when the temperature of the refrigerant discharged from the compressor becomes high in the hot water supply operation in winter, the temperature of the refrigerant discharged from the compression mechanism is lowered by the heat exchanger. To be cooled. In this case, the temperature of the lubricating oil in the compressor body also decreases due to a decrease in the temperature of the discharged refrigerant in the compressor body.

  According to the present invention, even when the temperature of the discharged refrigerant becomes high, the temperature of the refrigerant discharged from the compression mechanism can be lowered to sufficiently cool the motor, so that the reduction in the efficiency of the motor is effectively suppressed. can do. Moreover, since the temperature of the lubricating oil in the compressor body can also be lowered, the viscosity of the lubricating oil can be increased to improve the sealing performance of the compression mechanism, and the performance (volume efficiency) of the compression mechanism can be improved. it can.

  1 and 2 show an embodiment of the present invention, FIG. 1 is a side sectional view of a compressor, and FIG. 2 is a schematic configuration diagram of a heat pump type hot water supply apparatus.

  A compressor 1 shown in FIG. 1 rotates a compressor body 2 having an upper end and a lower end closed, a scroll-type compression mechanism 3 that compresses refrigerant, a drive shaft 4 that drives the compression mechanism 3, and a drive shaft 4. A motor 5 and a heat exchanger 6 for cooling the refrigerant discharged from the compression mechanism 3 are provided.

  The compressor body 2 includes a cylindrical housing 2a having upper and lower ends opened, an upper lid 2b for closing the upper end opening of the housing 2a, and a lower lid 2c for closing the lower end opening of the housing 2a. A refrigerant suction port 2d and a refrigerant discharge port 2e are provided on the side surface of the first side. The bottom of the compressor main body 2 stores the lubricating oil A.

  The compression mechanism 3 includes a well-known mechanism including a fixed scroll member 3a and a movable scroll member 3b that face each other with a spiral body, and the movable scroll member 3a rotates on a support member 3c fixed to the inner peripheral surface of the housing 2a. It is supported to be able to turn while being regulated. The fixed scroll member 3a is disposed above the movable scroll member 3a, and a refrigerant discharge hole 3d is provided at the center of the upper surface thereof. Further, the refrigerant discharge port 2e of the compressor body 2 is disposed below the support member 3c.

  The drive shaft 4 is rotatably supported at its upper end side by a support member 3c, and its lower end is rotatably supported by a bearing 4a fixed to the inner peripheral surface of the housing 2a. An eccentric shaft 4b is provided at the upper end of the drive shaft 4, and the eccentric shaft 4b is rotatably connected to the center of the lower surface of the movable scroll member 3b. Further, the drive shaft 4 is formed in a hollow shape, and the lubricating oil A at the bottom in the compressor body 2 is supplied to the compression mechanism 3 through the oil passage 4c in the hollow portion.

  The motor 5 includes a rotor 5 a fixed to the drive shaft 4 and a stator 5 b fixed to the inner peripheral surface of the housing 2 a, and is disposed below the compression mechanism 3.

  The heat exchanger 6 includes a tube 6a through which a fluid flows and a plurality of heat transfer fins 6b provided on the tube 6a, and a mounting plate 6c formed so as to surround the tubes 6a and the heat transfer fins 6b from the side. Is fixed to the upper surface of the fixed scroll member 3a. The mounting plate 6c has an upper surface and a lower surface opened, and the refrigerant discharged from the refrigerant discharge hole 3d of the fixed scroll member 3a flows through the heat exchanger 6 and is guided upward.

  In the compressor configured as described above, when the drive shaft 4 is rotated by the motor 5, the movable scroll member 3b revolves while its rotation is restricted relative to the fixed scroll member 3a by the eccentric shaft 4b. As a result, the refrigerant sucked from the refrigerant suction port 2d of the compressor body 2 is compressed between the scroll members 3a and 3b, and the compressor body 2 from the refrigerant discharge hole 3d of the fixed scroll member 3a via the heat exchanger 6 is compressed. It is discharged to the upper part. The refrigerant discharged to the upper part in the compressor main body 2 circulates between the fixed scroll member 3a and the support member 3c and the inner surface of the housing 2a, and after flowing through the gap of the motor 5, the refrigerant of the compressor main body 2. It is discharged to the outside from the discharge port 2e.

  The heat pump type hot water supply apparatus using the compressor 1 circulates a heat pump circuit 10 that circulates refrigerant, a first hot water circuit 20 that circulates hot water, a second hot water circuit 30 that circulates hot water, and water for bathtubs. The bathtub circuit 40, the first water heat exchanger 50 for exchanging heat between the refrigerant of the heat pump circuit 10 and the hot water supply water of the first hot water supply circuit 20, the hot water supply water of the second hot water supply circuit 30 and the bathtub of the bathtub circuit 40 And a second water heat exchanger 60 for exchanging heat with water.

  The heat pump circuit 10 is formed by connecting the compressor 1, the expansion valve 11, the evaporator 12, and the first water heat exchanger 50. As shown by the solid line arrows in the figure, the compressor 1, the first water heat exchanger 50, The refrigerant is circulated in the order of the expansion valve 11, the evaporator 12, and the compressor 1. The refrigerant used in the heat pump circuit 10 is a natural refrigerant such as carbon dioxide.

  The first hot water supply circuit 20 is formed by connecting a hot water storage tank 21, a first pump 22, the heat exchanger 6 of the compressor 1 and the first water heat exchanger 50, and the hot water storage tank 21 as indicated by an open arrow in the figure. The water for hot water supply is circulated in the order of the first pump 22, the first water heat exchanger 50, the heat exchanger 6 of the compressor 1, and the hot water storage tank 21. A water supply pipe 23 and a second hot water supply circuit 30 are connected to the hot water storage tank 21, and hot water supplied from the water supply pipe 23 flows through the first hot water supply circuit 20 via the hot water storage tank 21. The hot water storage tank 21 and the bathtub A are connected via a flow path 25 provided with a second pump 24, and the hot water in the hot water storage tank 21 is supplied to the bathtub A by the second pump 24 as shown by a dashed line arrow in the figure. To be supplied.

  The second hot water supply circuit 30 is formed by connecting the hot water storage tank 21, the third pump 31, and the second water heat exchanger 60. As shown by the broken line arrows in the figure, the hot water storage tank 21, the second water heat exchanger 60, The hot water supply water is circulated in the order of the three pumps 31 and the hot water storage tank 21.

  The circuit 40 for bathtubs connects the bathtub A, the 4th pump 41, and the 2nd water heat exchanger 60, and as shown by the black arrow in the figure, the bathtub A, the 4th pump 41, the 2nd water heat exchanger The water for bathtubs is circulated in the order of 60 and bathtub A.

  The first water heat exchanger 50 is connected to the heat pump circuit 10 and the first hot water supply circuit 20 to exchange heat between the refrigerant flowing through the heat pump circuit 10 and the hot water supply water flowing through the first hot water supply circuit 20. .

  The second water heat exchanger 60 is connected to the second hot water supply circuit 30 and the bathtub circuit 40 so as to exchange heat between the hot water supply water of the second hot water supply circuit 30 and the bathtub water of the bathtub circuit 40.

  The hot water supply apparatus includes a heating unit 70 in which the heat pump circuit 10 and the first water heat exchanger 50 are arranged, a hot water storage tank 21, a first pump 22, a second pump 24, a second hot water supply circuit 30, a fourth pump 41, and The tank unit 80 in which the 2nd water heat exchanger 60 is arrange | positioned is provided, and the heating unit 70 and the tank unit 80 are connected via the 1st hot water supply circuit 20. FIG.

  In the hot water supply apparatus configured as described above, the high temperature refrigerant of the refrigerant circuit 10 and the hot water supply water of the first hot water supply circuit 20 are heat-exchanged by the first hydrothermal exchanger 50, and the hot water supply water of the hot water supply circuit 20 is changed. Heated. The hot water for the hot water supply circuit 20 that has flowed out of the first water heat exchanger 50 flows through the heat exchanger 6 of the compressor 1, and is heat-exchanged with the refrigerant discharged in the compressor 1 by the heat exchanger 6. At that time, the temperature of hot water for the hot water supply circuit 20 that flows out from the first water heat exchanger 50 (for example, 86 ° C.) is lower than the temperature of the refrigerant discharged from the compression mechanism 3 of the compressor 1 (for example, 110 ° C.). Therefore, the temperature of the discharged refrigerant is lowered to a temperature lower than the discharge temperature (for example, 100 ° C.), and the motor 5 is cooled by the discharged refrigerant whose temperature has decreased. Then, the refrigerant having a higher temperature (for example, 105 ° C.) as the motor 5 is cooled is discharged from the compressor 1. Further, the hot water supply water in the hot water supply circuit 20 becomes a high temperature (for example, 90 ° C.) by the amount of heat exchange with the refrigerant in the heat exchanger 6 of the compressor 1 and flows out from the heat exchanger 6 of the compressor 1 to the hot water storage tank 21 side. To do.

  As described above, according to the present embodiment, the heat exchanger 6 in the compressor 1 exchanges heat between the hot water for the hot water supply circuit 20 and the refrigerant discharged from the compression mechanism 3 of the compressor 1. Since the refrigerant before flowing through the motor 5 is cooled, for example, even when the temperature of the refrigerant discharged from the compressor 1 becomes high in the hot water supply operation in winter, the temperature of the refrigerant discharged from the compression mechanism 3 is lowered. Thus, the motor 5 can be sufficiently cooled, and a reduction in the efficiency of the motor can be effectively suppressed. Moreover, since the temperature of the lubricating oil A in the compressor main body 2 can also be reduced by lowering the temperature of the discharged refrigerant in the compressor main body 2, the viscosity of the lubricating oil A is increased to seal the compression mechanism 3. Performance can be improved, and the performance (volumetric efficiency) of the compression mechanism 3 can be improved. Further, since the temperature of the hot water for the hot water supply circuit 20 can be raised by the heat exchanger 6 of the compressor 1, the COP can be improved.

  In the above embodiment, the compressor 1 used in the heat pump type hot water supply apparatus is shown. However, any apparatus other than the hot water supply apparatus can be used as long as the apparatus heats a predetermined fluid by the refrigerant discharged from the compressor to the outside. The present invention can be applied to a compressor.

Side surface sectional drawing of the compressor which shows one Embodiment of this invention Schematic configuration diagram of heat pump hot water supply system

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Compressor main body, 2d ... Refrigerant suction port, 2e ... Refrigerant discharge port, 3 ... Compression mechanism, 5 ... Motor, 6 ... Heat exchanger, 10 ... Heat pump circuit, 12 ... Expansion valve, 13 ... Evaporator, 21 ... hot water storage tank.

Claims (2)

A compressor main body having a refrigerant suction port and a refrigerant discharge port, a compression mechanism that compresses the refrigerant sucked into the compressor main body from the refrigerant suction port, and a motor that drives the compression mechanism, and the refrigerant discharged from the compression mechanism In the compressor that cools the motor by circulating to the motor and discharges the refrigerant from the refrigerant discharge port of the compressor body to the outside.
The refrigerant before flowing through the motor is cooled by exchanging heat between a predetermined fluid provided in the compressor body and heated by the refrigerant discharged to the outside from the compressor body and the refrigerant discharged from the compression mechanism. A compressor comprising a heat exchanger. After circulating the refrigerant discharged from the compressor to the water heat exchanger, it is circulated to the evaporator via the expansion valve, and the heat pump circuit sucked into the compressor and the hot water supply water are circulated to the water heat exchanger by the pump. A hot water supply circuit that heats hot water supply water by a refrigerant of the heat pump circuit and a hot water storage tank that stores hot water supply water of the hot water supply circuit heated by the heat pump circuit so that the hot water stored in the hot water storage tank is heated to a predetermined temperature. In the heat pump type hot water supply device,
The compressor according to claim 1 as the compressor.
A heat pump type hot water supply apparatus configured to distribute hot water for a hot water supply circuit heated by a heat pump circuit to a heat exchanger of a compressor.

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