KR20040104043A - Scroll-type compressor having a cooling structure with heat pipe - Google Patents

Abstract

PURPOSE: A scroll-type compressor with a cooling structure using a heat pipe is provided to reduce power required, to increase cooling capacity, and to improve durability. CONSTITUTION: A scroll-type compressor(10) with a cooling structure using a heat pipe comprises a housing(12) having at least one actuating fluid inlet and outlet to the central part and outer peripheral part; a fixed scroll(13) fixed to the inside of the housing and extended to the outer peripheral part from the central part in a spiral shape; a rotary scroll(15) extended to the outer peripheral part from the central part in a spiral shape to engage with the fixed scroll inside the housing; a driving shaft(17) connected to the rotary scroll to drive the rotary scroll; and a cooling part(30) formed to the outside of the housing in a heat pipe structure to absorb the heat produced by the compression of an actuating fluid in the housing. The housing is closed except the inlet and outlet. The rotary scroll turns with a predetermined turn radius to consecutively compress the actuating fluid flowing into the housing.

Description

SCROLL-TYPE COMPRESSOR HAVING A COOLING STRUCTURE WITH HEAT PIPE}

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor having a fixed scroll and a swing scroll in a pair to continuously compress the working fluid and a refrigeration cycle using the same.

In general, in the case of a piston-type compressor, even if a sufficient heat radiation fin is installed outside the cylinder, it is impossible to transmit a large amount of heat to the outside through the cylinder wall for a short time when the piston moves due to insufficient area in the cylinder contacting the compressed gas. . Therefore, the actual compression process is closer to the adiabatic process than to the isothermal process.

Referring to the P-V diagram of FIG. 6, 1-3 is an isothermal process and 1-2 is an adiabatic process. When the pressure ratio of the compressor is large, the temperature of the gas increases due to compression, and the difference (area 1-2-3) between the adiabatic compression day and the isothermal compression day increases. In this case, in order to reduce the compression work and increase the volumetric efficiency, the compression work is compressed into several stages, and in the meantime, the intermediate cooler is installed and cooled to the initial temperature of compression to make the whole close to isothermal compression (1 → 3). .

In the case of two-stage compression in FIG. 6, P _A to P _B of the low pressure cylinder are compressed, and intermediate cooling is performed to lower the temperature to the initial temperature and P _B to P _C in the high pressure cylinder. This reduces the consumption days by area 2-4-5-6 than in the case of adiabatic compression (1 → 2) from P _A to P _C. In addition, increasing the number of stages may approach the isothermal process (1-3), which may further reduce the required amount of work, but the composition of the device is complicated and the device value is increased. The singular will be determined.

When a reciprocating compressor is used in a refrigeration cycle, a large compression ratio decreases the compressor's volumetric efficiency by increasing the outlet temperature of the compressor. In order to solve such a problem, a compression method is generally used by dividing into multiple stages.

As shown in FIG. 7, when the intermediate cooling (3-4) is performed using two stages of the low compression (2-3) and the high compression (4-5), the hatching in the Ts diagram of FIG. The compressed work is reduced by the area 3-4-5-3 ', where the compressed work w becomes w = (h ₃ -h ₂ ) + (h ₅ -h ₄ ) in the Ph diagram of FIG. 9. . If the number of compression stages is further increased in two stages, it is closer to 2-5 in the Ts diagram of FIG. 8 and the compression work is further reduced by an area of 2-3-4 and an area of 4-5-5 ', resulting in an excellent energy saving effect. In particular, when the evaporation temperature is lowered, the compression ratio increases, and a multistage compression method that compresses the compression process into two stages and three stages is applied.

On the other hand, Figure 10 is a principle diagram shown to explain the compression process of the scroll compressor.

The operation principle of the scroll compressor, as shown in Figure 10, is arranged so that the fixed scroll 60 and the swing scroll 70 of the involute shape has a phase difference of 180 degrees with each other, thereby the crescent moon inside the scroll compressor There will be several sealed spaces. When gas flows into the scroll compressor through the suction pipe located at the circumference of the fixed scroll 60, the crescent shaped enclosed space is moved to the center by the orbiting movement of the orbiting scroll 70, and the volume of the enclosed space is reduced and the gas is compressed. Discharged through the discharge port located in the center of the fixed scroll (60). At this time, in the scroll compressor, a series of processes are continuously performed by several closed spaces of the crescent shape.

Since such scroll compressors have advantages such as high efficiency, low noise, low vibration, and light weight, they are used not only as refrigerant compressors in the refrigeration and air conditioning industry but also as general air compressors and oil-free air compressors.

As the high load, high compression ratio, and large size of the scroll compressor operate, the problem is that the oil is carbonized or inserted into the end surface of each scroll wrap (fixed scroll or spiral blade) according to the temperature of discharge gas. It dissolves the tip seal, which reduces the reliability of the compressor and shortens its life.

Another problem with scroll compressors is that as the working gas is compressed into the center, the temperature rises, and as a result, the temperature of the center of the scroll wrap is much higher than the temperature of the periphery, resulting in friction, leakage, The vibration increases and the compression performance deteriorates rapidly. Due to the principle of the scroll compressor, the space between the center and the periphery of the scroll wrap (two times the radius of rotation) must be constant to maintain the tightness of the several enclosed spaces inside the scroll wrap within the scroll. If the thermal expansion is changed by the difference in the lap spacing, friction, leakage, vibration increases and compression performance is sharply deteriorated.

In order to solve these problems, effective cooling of the scroll wrap is required. In the case of an air compressor, the air circulation cooling method using a cooling fan is most commonly used. Thus, US Patent Publication No. 2002/0110470 The arc discloses a configuration in which a cooling water passage is formed in the fixed scroll housing to cool the central portion with the cooling water, and then a heat insulating material is provided at the periphery so that the suction gas is not reheated by the heated cooling water.

In addition, US Pat. No. 3,986,799 proposes a method of precisely configuring a cooling water channel in a fixed scroll and a rotating scroll wrap to cool it, but the mechanical structure is very complicated and the temperature is continuously heated as the cooling water passes through the channel. As a result, the scroll wrap cannot be cooled uniformly.

As a cooling method of a refrigerant compressor, Korean Patent Laid-Open Publication No. 1999-0042632 proposes a method of cooling a discharged gas passing through a fixed scroll and a discharge port of the fixed scroll by bringing a low temperature suction gas into wide contact with a fixed scroll. In this case, the volumetric efficiency of the compressor decreases due to the rise in temperature of the suction gas after cooling, and the temperature of the discharge gas also rises again. In addition, in US Pat. No. 6,186,755, a method of cooling a fixed scroll with suction gas by installing a heat pipe inside the fixed scroll housing as the prior art decreases the volumetric efficiency of the compressor due to a rise in temperature of the suction gas, thereby lowering the cooling efficiency. Pointing out, a method of forming a heat pipe inside a central drive shaft with the highest temperature to absorb heat at the center and dissipating heat through the shaft to cooling fans on both sides of the shaft has been proposed.

On the other hand, in the case of a low temperature refrigerant compressor, a high operating pressure ratio is required, and at this time, the discharge gas temperature becomes excessively high. US Pat. No. 5,447,420 injects liquid refrigerant into the compression chamber to utilize the latent heat of evaporation to increase the temperature of the compressed gas. Although the compressor pressure increases with the increase of the liquid injection amount, the scroll compressor mounting unit automatically controls the liquid injection amount by the degree of heating between the discharge gas temperature and the discharge pressure saturation temperature. A liquid injection valve with a function is adopted. However, the injection method of the liquid injection in the compressor does not theoretically improve the thermodynamic efficiency, and the mechanical configuration and the control method are somewhat complicated.

The present invention was devised to solve the above problems, and its object is to provide a fixed scroll and a swing scroll so that the working fluid supplied to the central air inlet is continuously compressed and the cooling is effectively performed using a heat pipe. A structure is provided outside the housing to provide a scroll compressor having a cooling structure that absorbs heat from the fixed scroll and dissipates heat to the cooling medium flow path.

Another object of the present invention is to provide a refrigeration cycle having the features of reducing the power consumption, increase the cooling capacity, improve durability by including a scroll-type compressor having the cooling structure.

1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1.

3 is a plan view seen from a direction B of FIG. 1.

Figure 4 is a schematic view showing a general heat pump refrigeration cycle.

5 is a block diagram showing a heat pump refrigeration cycle having a scroll compressor according to an embodiment of the present invention.

6 is a P-V diagram according to various compression processes.

7 is a configuration diagram showing a refrigeration cycle having a general multi-stage compression configuration.

8 is a T-s diagram for confirming the effect of multi-stage compression.

9 is a P-h diagram which can confirm the effect of multi-stage compression.

10 is a diagram illustrating the compression process of the scroll compressor.

* Description of the symbols for the main parts of the drawings *

10: scroll compressor 12: housing

12a: suction line 12b: discharge line

13: fixed scroll 14: compression chamber

15: Swivel scroll 17: Drive shaft

18: Anti-rotation shaft 20: Motor

23, 24, 25: bearing 30: cooling part

32: Internal heat sink fin 34: External heat sink fin

36: coolant jacket 36a: coolant inlet

36b: cooling water outlet 50: refrigeration cycle

52: low temperature water line 53: the first heat exchanger

55: expansion valve 56: heat source water line

57: second heat exchanger

In order to achieve the above object, a scroll compressor according to the present invention comprises: a housing having at least one working fluid entrance and exit at each of the central and outer periphery thereof, except for the entrance; A fixed scroll fixed to the inside of the housing and spiraling from the center and extending to the outer circumference; A pivoting scroll which spirals from a center portion of the housing so as to engage with the fixed scroll and extends to an outer circumferential portion thereof and has a predetermined turning radius so as to continuously compress the working fluid flowing into the housing; A drive shaft connected to the swing scroll to drive the swing scroll; And a cooling unit configured to have a heat pipe structure on an outer surface of the housing to absorb heat generated by the working fluid compression inside the housing.

The cooling unit is preferably formed on the outer surface portion of the housing including the center of the fixed scroll, it is also preferably formed on the outer surface of the housing to a size as large as the plane including at least the center of the fixed scroll.

The cooling unit having the heat pipe structure may have a plurality of internal heat dissipation fins formed inside a portion corresponding to the outer surface of the housing, and the cooling unit having the heat pipe structure may be disposed outside the portion not adjacent to the housing. An external heat dissipation fin may be formed.

Furthermore, a coolant jacket may be further installed on an outer side of the cooling unit having the heat pipe structure, and the arrangement of the external heat dissipation fins may be such that the arrangement direction of the external heat dissipation fins is staggered with a predetermined angle (θ) from the inflow and outflow direction of the coolant passing through the coolant jacket. .

On the other hand, the refrigeration cycle according to the present invention, the scroll compressor having the above characteristics; A first heat exchanger connected to a working fluid outlet at the center of the scroll compressor to pass a high temperature working fluid compressed and discharged from the scroll compressor; An expansion valve connected to a rear end of the first heat exchanger to expand a working fluid passing through the first heat exchanger; And a second heat exchanger connected to the rear end of the expansion valve and connected to the working fluid inlet of the scroll compressor outer circumference to pass the low temperature working fluid passing through the expansion valve to the scroll compressor.

In the refrigeration cycle, as the cold water line passes through the first heat exchanger, heat is absorbed from the high temperature working fluid passing through the first heat exchanger, and the second heat source water line passes through the second heat exchanger. The heat exchanger can also supply heat to the cold working fluid that passes.

When the coolant jacket is further installed outside the cooling unit of the scroll compressor having the heat pipe structure, the low temperature water line first absorbs heat while passing through the coolant jacket, and the high temperature working fluid passes. The heat can be absorbed secondarily through the heat exchanger.

At least one of the first heat exchanger and the second heat exchanger may be an air-cooled heat exchanger.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line A-A of Figure 1, Figure 3 is a plan view seen from the direction A of FIG.

As shown, the scroll compressor 10 according to an embodiment of the present invention includes a fixed scroll 13 and a revolving scroll 15 inside the housing 12 to compress the working fluid flowing into the housing ( It is discharged to the outside of 12).

The housing 12 has a suction pipe 12a, which is an inlet of the working fluid, at an outer circumference thereof, and a discharge pipe 12b, which is an outlet of the working fluid, at its center. The housing 12 is sealed from the outside at portions other than the suction pipe 12a and the discharge pipe 12b.

The fixed scroll 13 is fixed to the inner side of the housing 12, spirals from the center and extends to the outer circumference, the center of the fixed scroll 13 is located to correspond to the discharge pipe 12b of the housing 12. . The swinging scroll 15 extends from the center to the outer circumference in a spiral form so as to engage with the fixed scroll 13 in the housing 12, and to continuously compress the working fluid introduced into the housing 12. Turn with a turning radius of.

The swinging scroll 15 is connected with a drive shaft 17 for driving it, and adjacently a rotation preventing shaft 18 for preventing self-rotation of the swinging scroll 15 is also connected. Power may be transmitted from the outside through the drive shaft 17. In this embodiment, the motor 20 is connected to the drive shaft 17 to provide power. Bearings 23, 24, and 25 are installed at portions where the drive shaft 17 and the rotation preventing shaft 18 are engaged and rotated. In addition, a motor coolant jacket 21 may be further installed at an outer circumference of the motor 20 so that the coolant flows along the outer circumference of the motor 20.

The cooling unit 30 is installed on the outer surface of the housing 12 to absorb heat generated by the working fluid compression inside the housing 12. The cooling unit 30 has a heat pipe structure and is formed on an outer surface portion of the housing 12 including a central portion of the fixed scroll 13. In addition, the cooling unit 30 is preferably formed in a size as large as a plane including the center of the fixed scroll 13, a plurality of internal heat radiation fins in the interior corresponding to the outer surface of the housing 12 32 may be formed, and a plurality of external heat dissipation fins 34 may be formed on the outside of the portion not adjacent to the housing 12.

On the other hand, the coolant jacket 36 is further provided on the outside of the cooling unit 30 to dissipate heat transported by the heat pipe to the outside. The cooling water jacket 36 is provided with a cooling water inlet 36a and a cooling water outlet 36b to allow the cooling water to flow in and out. At this time, the arrangement direction of the external heat dissipation fins 34 may be formed to be staggered by a predetermined angle θ without being parallel to the inflow and outflow direction of the coolant passing through the coolant jacket 36. It is possible to increase the heat dissipation efficiency while contacting a number of external heat dissipation fins 34. The angle θ preferably forms an acute angle.

Looking at the operation of the scroll compressor 10 according to the present invention as described above are as follows.

That is, the working fluid introduced through the suction pipe 12a is gradually compressed while passing between the turning scroll 15 and the fixed scroll 13 which flows directly into the compression chamber 14 inside the housing 12 and pivots. At this time, since the cooling unit 30 and the coolant jacket 36 of the heat pipe structure installed outside the housing 12 are effectively and continuously cooled, the process requires close to isothermal compression while minimizing the power required for compression. Can be. The compressed working fluid is discharged to the outside of the housing 12 through the discharge pipe 12b.

The scroll compressor 10 has a heat transfer area that is in contact with the gas in the compression space more than 10 times larger than the reciprocating compressor due to the scroll wrap, and because the residence time in the compression space increases more than two to three times at the same rotational speed, the fixed scroll ( 13) and a heat pipe structure cooling unit 30 is installed on the outer surface of the housing 12 corresponding to the high speed to absorb the heat generated when the working fluid is compressed to cool the cooling medium, for example, coolant, etc. By using this method, the isothermal compression process close to multiple stages of multistage compression can be realized and the consumption days can be reduced by that. In this case, in order to efficiently cool the fixed scroll 13, it is preferable to manufacture the fixed scroll 13 using a material having excellent thermal conductivity, for example, aluminum or copper.

In addition, the heat pipe is characterized by a large amount of heat transport by the latent heat of evaporation, as well as the heat-soaking part and the heat dissipating part due to the excellent isothermalizing effect of maintaining the gas-liquid equilibrium in the heat pipe. The temperature distribution of can be kept very uniform (within the temperature difference of 1 to 2 ℃). Due to the characteristics of the heat pipe, it is possible to achieve sufficient cooling and uniform temperature distribution, which is the most important in the cooling of the scroll compressor. Therefore, due to the increase in friction, leakage and vibration due to the temperature gradient (difference in thermal expansion) of the scroll wrap, Deterioration of the compressor can be minimized and durability is improved by preventing dissolution of the tip seal as the temperature of the discharge gas is lowered.

On the other hand, since the heat pipe can use different heat receiving areas and heat dissipating areas, it is possible to effectively cool or heat a small area quickly. Therefore, the internal heat dissipation fins 32 are formed in the cooling unit 30 having the heat pipe structure so as to increase the heat exchange area of the fixed scroll 13 and the heat receiving unit adjacent to each other, and the cooling water jacket 36 is formed outside. An external heat dissipation fin 34 is formed to further increase the heat exchange area of the heat dissipation portion in contact with the cooling water. By doing in this way, the heat transportation of the cooling part 30 which has a heat pipe structure can be made smooth.

Figure 4 is a schematic view showing a general heat pump refrigeration cycle.

As shown, the heat pump refrigeration cycle is configured such that the compressor 41, the condensation heat exchanger 43, the expansion valve 45 and the evaporation heat exchanger 47 constitutes a cycle, the low-temperature water for cooling the high-temperature refrigerant It is supplied to the heat exchanger 43 for condensation and heated and then used as high temperature water, and the heat source water is supplied to the evaporation heat exchanger 47 for cooling of the low temperature refrigerant, and then used as cold water. In the case of a domestic refrigerator, the condensation heat exchanger 43 and the evaporation heat exchanger 47 are not only water cooled but also air cooled.

5 is a block diagram showing a heat pump refrigeration cycle having a scroll compressor according to an embodiment of the present invention.

As shown, the heat pump refrigerating cycle 50 according to the present embodiment includes the scroll compressor 10 and is connected to the discharge pipe 12b which is the working fluid outlet of the center of the scroll compressor 10. The first heat exchanger (53) through which the high-temperature working fluid discharged by compression passes, the expansion side (55) connected to the rear end of the first heat exchanger (53) to expand the working fluid passing therethrough, and the expansion side ( 55 is connected to the rear end of the second heat exchanger (57) through which the low-temperature working fluid passes. The second heat exchanger 57 is cycled by being connected to the suction pipe 12a which is the working fluid inlet of the outer peripheral portion of the scroll compressor 10.

At this time, the first heat exchanger 53 serves as a condenser to lose heat as the high temperature working fluid passes, and the second heat exchanger 57 serves as an evaporator to obtain heat as the low temperature working fluid passes. To this end, the low temperature water line 52 passes through the first heat exchanger 53 to absorb heat, and the heat source water line 56 passes through the second heat exchanger 57 to supply heat.

The low temperature water 52 passes through a coolant jacket 36 installed outside the cooling unit 30 of the scroll compressor 10 so that the low temperature water absorbs heat first and the first heat exchanger. Passing the group 53 will absorb the heat second. In other words, the cold water is supplied to the cooling water jacket 36 to cool the working fluid primarily in the compression process of the scroll compressor 10 and to further cool the second heat in the first heat exchanger 53. . In addition, to cool the motor 20, the low temperature water is branched before being supplied to the coolant jacket 36 to be supplied to the motor coolant jacket 21 to cool the motor 20, and then to the coolant of the scroll compressor 10. Join the cold water line 52 passing through the jacket (36).

By using the cooling unit 30 of the heat pipe structure at the same time as the compression in the scroll compressor 10, a large amount of heat of the working fluid in contact with the wide scroll wrap surface can be moved to the coolant jacket 36 to reduce the required power, Since the temperature of the discharged working fluid can be lowered, the first heat exchanger 53 required for condensation can be further miniaturized than before, and the low temperature water relatively heated due to the cooling of the working fluid is again used as high temperature water. Can be.

The working fluid cooled while passing through the first heat exchanger 53 is supplied with pressure to the second heat exchanger 57 through the expansion valve 55 and absorbs heat from the heat source water line 56 to evaporate. Then it is recirculated while being supplied again to the suction pipe 12a of the scroll compressor 10. At this time, the heat source water supplied to the second heat exchanger 57 for evaporation of the low temperature working fluid may be relatively cooled after heat exchange and used as cold water again.

As the first heat exchanger 53 and the second heat exchanger 57, not only a water-cooled heat exchanger in this embodiment but also an air-cooled heat exchanger may be used.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the scroll-type compressor having a cooling structure using a heat pipe according to the present invention, a cooling unit having a heat pipe structure is installed on the outer surface of the housing to continuously absorb and cool the heat generated when the working fluid is compressed. By dissipating heat to the medium, it is possible to lower the temperature of the discharged working fluid to improve the durability of the compressor and to minimize the required power of the compressor.

In the refrigerating cycle to which the scroll compressor according to the present invention is applied, by effectively cooling the scroll compressor, it is possible to obtain the effect of reducing the work of compression and increasing the capacity of the compressor, and operating during compression through the heat pipe structure in the compressor. Since the temperature of the working fluid discharged by absorbing a large amount of the heat of the fluid can be lowered, there is an advantage of miniaturizing the heat bridge required for condensation.

Claims (13)

A housing having at least one working fluid entrance and exit at each of the central and outer peripheries, except for the entrance; A fixed scroll fixed to the inside of the housing and extending from the center to the outer circumference; A pivoting scroll having a predetermined radius of revolution so as to continuously compress the working fluid flowing into the spiral and circumferentially from the central portion to engage the fixed scroll in the housing; A drive shaft connected to the swing scroll to drive the swing scroll; And Cooling unit which is made of a heat pipe structure on the outer surface of the housing to absorb heat generated by the working fluid compression inside the housing Scroll type compressor comprising a. The method of claim 1, And the cooling unit is formed on an outer surface portion of the housing including a central portion of the fixed scroll. The method of claim 2, The cooling unit is a scroll type compressor, characterized in that formed on the outer surface of the housing to a size as large as the plane including at least the center of the fixed scroll. The method of claim 1, And a cooling unit having the heat pipe structure has a plurality of internal heat dissipation fins formed inside a portion corresponding to an outer surface of the housing. The method of claim 1, And a cooling unit having the heat pipe structure is formed with a plurality of external heat dissipation fins on the outside of a portion not adjacent to the housing. The method of claim 1, Scroll type compressor, characterized in that the coolant jacket is further provided on the outside of the cooling unit having the heat pipe structure. The method of claim 1, The cooling unit having the heat pipe structure has a plurality of external heat dissipation fins formed on the outside of the portion not adjacent to the housing, and a coolant jacket is further installed on the outside thereof, and the cooling water in which the external heat dissipation fins are arranged passes through the coolant jacket. A scroll compressor, characterized in that the flow in and out of the direction and the predetermined angle (θ) is staggered. The method of claim 1, A motor connected to the drive shaft to provide power; And Motor coolant jacket is installed so that the coolant flows along the outer periphery of the motor Scroll type compressor further comprising a. At least one working fluid entrance in each of the center and the outer circumference, except the entrance, a sealed housing, a fixed scroll fixed to the interior of the housing and spiraling from the center to the outer circumference; Swivel scrolls having a predetermined turning radius spirally extending from the center to the outer circumference to engage the scroll and continuously compressing the working fluid flowing into the housing, and a heat pipe structure on the outer surface of the housing. A scroll type compressor including a cooling unit capable of absorbing heat generated by the working fluid compression inside the housing and a driving shaft connected to the swing scroll to drive the rotating scroll; A first heat exchanger connected to a working fluid outlet at the center of the scroll compressor to pass a high temperature working fluid compressed and discharged from the scroll compressor; An expansion valve connected to a rear end of the first heat exchanger to expand a working fluid passing through the first heat exchanger; A second heat exchanger connected to a rear end of the expansion valve and connected to a working fluid inlet of an outer circumference of the scroll compressor, and supplied to the scroll compressor through a low temperature working fluid passing through the expansion valve; Refrigeration cycle comprising a. The method of claim 9, The low temperature water passing through the first heat exchanger to absorb heat from the high temperature working fluid that also passes through the first heat exchanger, and through the second heat exchanger to the heat source water line that also passes through the second heat exchanger. A refrigeration cycle, characterized by supplying heat to the working fluid. The method of claim 10, A cooling water jacket is further installed outside the cooling unit of the scroll compressor having the heat pipe structure, and the first heat exchanger through which the low temperature water absorbs heat primarily through the cooling water jacket and passes the high temperature working fluid. Refrigeration cycle, characterized in that absorbs heat secondarily. The method of claim 11, The low temperature water line is branched before being connected to the coolant jacket and connected to the motor coolant jacket installed on the outer circumferential surface of the scroll compressor to supply the coolant, and the motor coolant jacket is again connected to the low temperature water line to connect the motor coolant. And a cooling water passing through the jacket to join the cold water line. The method of claim 9, At least one of the first heat exchanger and the second heat exchanger is an air-cooled heat exchanger.