KR102038934B1 - A Lower Global Warming Potential Type of a Cooling System for a Refrigerator Truck - Google Patents

Abstract

The present invention relates to a refrigeration tower refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure, and a refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure capable of efficiently freezing a freezing space while circulating a refrigerant having a low warming index. The refrigeration system for a refrigeration tower vehicle having a low temperature refrigeration index refrigerant structure includes: an ejector (15) having a diffusion unit (151) for bringing refrigerant supplied from a compressor (13) operated by a motor (12) into a low temperature and a reduced pressure state; A gas / liquid separator 16 for separating the refrigerant transferred from the ejector 15 into a gas and a liquid; An evaporator 17 for evaporating the refrigerant supplied from the gas / liquid separator 16; And proportional control means 19 for adjusting the amount of gas supplied from the evaporator 17 to the ejector 15.

Description

A Lower Global Warming Potential Type of a Cooling System for a Refrigerator Truck}

The present invention relates to a refrigeration tower refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure, and a refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure capable of efficiently freezing a freezing space while circulating a refrigerant having a low warming index.

Since the use of HFC (hydro fluoro carbon), which is used as a replacement for freon gas, is regulated as a refrigerant due to the progress of global warming, a refrigerant having a low temperature index is being developed to replace it. As alternative refrigerants for HFCs, R-1234yf, R410A or similar HFO (hydro fluoro olefin) refrigerants are gradually expanding their application. However, such HFO-based refrigerants exhibit low pressure characteristics at saturation temperature conditions and relatively high values of GDT (Gliding Temperature Difference) corresponding to the temperature difference between the onset and completion of evaporation or condensation. There is a need. Therefore, the design of a refrigeration system suitable for the application of the HFO-based refrigerant is required. WO 2006/109617 discloses a unit for an ejector type refrigeration cycle having a refrigerant decompression means and an ejector used as the refrigerant means. In addition, Patent Registration No. 10-1359932 relates to a refrigeration-cooling system of a refrigeration tower vehicle using an ejector. When the refrigeration unit and the cooling unit of the refrigeration tower are operated at the same time, the flow rate of the refrigerant is reduced toward the freezer evaporator and high pressure is not formed. The present invention discloses a cooling-freezing system which can prevent the performance degradation of the system by preventing the loss of the system. However, the prior art does not disclose a structure that can effectively control the amount of refrigerant flowing into the evaporator from the ejector.

The present invention is to solve the problems of the prior art has the following object.

Prior art 1: WO 2006/109617 (Kabushiki Denso, published on October 19, 2006) Unit for ejector type refrigeration cycle Prior Art 2: Patent Registration No. 10-1359932 (Otec Carrier Refrigeration Co., Ltd., Feb. 11, 2014) Refrigeration-cooling system of refrigeration tower car using ejector

An object of the present invention is to provide a refrigeration system for a refrigeration tower vehicle having a low temperature refrigeration refrigerant structure to effectively control the amount of the refrigerant flowing into the evaporator from the ejector to improve the cooling efficiency by the refrigerant of the low temperature flame index.

According to a preferred embodiment of the present invention, a refrigeration tower vehicle refrigeration system having a low temperature refractory index refrigerant structure comprises: an ejector having a diffusion unit for making refrigerant supplied from a compressor operated by a motor into a low temperature and a reduced pressure state; A gas / liquid separator separating the refrigerant transferred from the ejector into a gas and a liquid; An evaporator for evaporating the refrigerant supplied from the gas / liquid separator; And proportional control means for adjusting the amount of gas supplied from the evaporator to the ejector.

According to another suitable embodiment of the present invention, the refrigerant is R-452A or R-455A and the oil of the compressor is POE (polyolester) which is 10-15 wt% of the refrigerant weight.

According to another suitable embodiment of the present invention, a cooling module installed above the refrigeration tower; A distribution plate disposed on the inner ceiling surface of the cooling module; And a plurality of linear cooling members disposed along the distribution plate, each having a plurality of nozzles.

The refrigeration system according to the present invention, for example, by applying a 7.5 KW class R-452A, R-455A or similar HFO-based refrigerant to ensure that the freezing space of the refrigeration tower vehicle is efficiently maintained at a predetermined temperature condition. In addition, the refrigeration system according to the present invention is to ensure the stability of the refrigerant by applying a refrigerant in which R-452A or R-455A and polyolefin is properly mixed. In addition, the refrigeration system according to the invention allows the power consumption to be reduced by effectively controlling the refrigerant circulation cycle.

1 illustrates an embodiment of a refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure according to the present invention.
2 illustrates an embodiment of an ejector applied to a refrigeration system according to the present invention.
3 illustrates an embodiment of a refrigeration tower to which a refrigeration system according to the present invention is applied.
Figure 4 shows an embodiment of the operating structure of the refrigeration system according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the embodiments set forth in the accompanying drawings, but the embodiments are provided for clarity of understanding and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, and thus are not repeatedly described unless necessary for understanding of the invention, and well-known components are briefly described or omitted. It should not be understood to be excluded from the embodiment of.

1 illustrates an embodiment of a refrigeration system for a refrigeration tower vehicle having a low temperature warming refrigerant structure according to the present invention.

Referring to FIG. 1, the refrigeration system for a refrigeration tower vehicle having a low temperature refrigeration index refrigerant structure has an ejector having a diffusion unit 151 for bringing refrigerant supplied from a compressor 13 operated by a motor 12 into a low temperature and a reduced pressure state. 15); A gas / liquid separator 16 for separating the refrigerant transferred from the ejector 15 into a gas and a liquid; An evaporator 17 for evaporating the refrigerant supplied from the gas / liquid separator 16; And proportional control means 19 for adjusting the amount of gas supplied from the evaporator 17 to the ejector 15.

The refrigeration system for a refrigeration tower vehicle may be operated by electric power supplied by a battery or a battery connected to the engine 11 of the vehicle. For example, the compressor 13 may be operated by the power supplied from the battery, and the other driving module may be operated by the power supplied by the capacitor. The storage battery or battery may be charged by an external power supply or may be charged from the engine 11. In the refrigeration system according to the present invention, the refrigerant may have a lower global warming potential, for example, a value of GWP may be 150 or less, for example, R-404A, R-452A, and R-. 455A or similar hydrofluorinated polyolefin (HFO) based refrigerants. In the compressor 13, the refrigerant may be compressed to be in a gas state of high pressure and high temperature. As the oil for sealing in the compressor 13, it can be used, for example, POE (polyolester) which is 30 wt% or less of the refrigerant weight, preferably POE (polyolester) which is 10 to 15 wt%. If the amount of oil is small, there is a sealing effect, and if the amount of oil is larger than the suggested amount has the disadvantage that the phase separation phenomenon. As described above, when the refrigerant is compressed by the compressor 13 to become a gas of high temperature and high pressure, the refrigerant may be transferred to the condenser 14 to be condensed while being exchanged with heat to become a liquid of low temperature and high pressure. Thereafter, the refrigerant may be supplied to the ejector 15 and expanded while being decompressed through the diffusion unit 151 to be transferred to the gas / liquid separator 16. In the gas / liquid separator 16, a gaseous refrigerant and a liquid refrigerant may coexist, and the gaseous refrigerant may be transferred to the compressor 13 or to a heat exchanger. And the refrigerant in the liquid state can be led to the evaporator 17 through a flow tube 18 such as a capillary tube. As the refrigerant evaporates in the evaporator 17, the cooling space CV may be cooled. At least a portion of the refrigerant in the gaseous state in the evaporator 17 may be led to the ejector 15, and the remaining liquid may be led to the compressor 13. In this process, the flow rate or flow pressure of the refrigerant guided to the evaporator 17 through the induction tube 18 can be detected, and the detection value can be transmitted to the proportional control means 19. The proportional control means 19 may function to control the flow of the refrigerant in the gaseous state according to the inlet pressure or the inlet pressure of the refrigerant flowing into the evaporator 17. For example, the proportional control means 19 may be such as but not limited to a pressure regulating means or a proportional control valve. The flow control valve 161 can be actuated by the operation of the proportional control means 19, which at the same time regulates the amount of gaseous form that is led from the evaporator 17 to the ejector 15. The flow rate of the refrigerant in gaseous form leading from the gas / liquid separator 16 to the compressor 13 can be adjusted. While evaporating in the evaporator 17, the cooling space (CV) is made while efficiently circulating the refrigerant by controlling at least a portion of the gaseous refrigerant to the ejector 15 while controlling the flow state by the proportional control means 19. To maintain the internal temperature of The internal temperature condition of the cooling space CV may be adjusted by the operation of the ejector 15.

2 shows an embodiment of an ejector 15 applied to a refrigeration system according to the invention.

Referring to FIG. 2, the ejector 15 includes a nozzle unit 22 coupled to the induction body 21 while controlling the supply of refrigerant conveyed from the compressor or the condenser; A uniform flow path 24 extending forward of the induction body 21; And a diffusion unit 151 connected with the uniform flow path 24. The flow path 221 may be formed inside the nozzle unit 22, and the refrigerant supplied from the compressor or the condenser may be led to the flow path 221 through the supply regulation unit 26. An adjustment piston 231 may be installed inside the flow path 221, and the adjustment piston 231 may be provided with pressure in the flow path 221 by the pressure adjusting member 232 by the drive unit 23. The position can be adjusted accordingly. The evaporative refrigerant derived from the evaporator may be led to the gas induction path 211 formed outside the flow path 221 via the gas supply means 27. The uniform flow path 24 may be connected to the flow path 221 and the gas induction path 211 and may extend with a uniform internal path. At the end of the uniform flow path 24, a diffusion path 251 may be formed in which the cross-sectional area is increased, and has a constant cross-sectional area having the same diameter as the end of the diffusion path 251 from the end of the diffusion path 251. Uniform pressure space 252 may be formed to extend. And the uniform pressure space 252 may be connected with the flow tube described above by the supply path 253. The flow pressure of the supply regulation unit 26 can be transmitted to the drive unit 23, and the flow pressure and temperature of the evaporated gas supplied from the gas supply means 27 can be detected by the evaporation detection unit 28. . And the detected flow pressure and temperature can be transmitted to the drive unit 23, and the drive unit 23 can adjust the position of the regulating piston 231 based on the transmitted flow pressure and temperature information. The uniform flow path 24 may have a relatively large diameter compared to the end of the flow path 221 and may include a flow extension path that suppresses vortices or reactions caused by gas flowing from the end of the flow path 221. 222 may be formed. The flow extension path 222 may extend by a predetermined length into the uniform flow path 24 having a uniform diameter while extending from the end of the flow path 221. By this structure, the supply of the refrigerant by the driving unit 23 can be precisely adjusted.

The ejector 15 may be made in various structures and is not limited to the embodiments shown.

3 illustrates an embodiment of a refrigeration tower to which a refrigeration system according to the present invention is applied.

Referring to FIG. 3, the cooling system includes a cooling module 34 installed above the freezing tower 32; A distribution plate 35 disposed on the inner ceiling surface of the cooling module 34; And a plurality of linear cooling members 36_1 to 36_K disposed along the distribution plate 35, each having a plurality of nozzles.

The refrigeration system may be installed in the refrigeration tower 32 of the refrigeration tower vehicle 31, the drive module 33 is installed outside the refrigeration tower 32, the cooling module such as an evaporator inside the refrigeration tower (32). 34 may be installed. The drive module 33 may be connected to the engine of the refrigeration tower 31, and the cooling module 34 may be disposed on the ceiling of the refrigeration tower 32. The cooling module 34 may be disposed in front of the ceiling of the refrigeration tower 32, the cooling module 34 is a bottom surface extending in the horizontal direction and the inclined surface extending to be inclined from the bottom surface and the end portion and the ceiling surface of the inclined surface It may be made of an emitting surface connecting the. An evaporator or a circulating fan may be disposed in the cooling module 34, and an insulating wall 322 may be installed inside the wall surface 321 of the freezing tower 32. The distribution plate 35 may be installed inside the ceiling surface of the freezing tower 32, and the distribution plate 35 may have a curved surface in the extending direction in which the center portion is convex downward with respect to the ceiling surface of the freezing tower 32. Can be. This structure allows the freezing space to be efficiently frozen while reducing the influence of the external environment. In addition, a plurality of linear cooling members 36_1 to 36_K may be disposed at regular intervals along the extending direction of the distribution plate 35. A plurality of discharge nozzles may be disposed along each of the linear cooling members 36_1 to 36_K, and cooling air may be discharged to the cooling space through the discharge nozzles. A distribution duct may be installed along the center of the distribution plate 35, and cooling air is distributed to each of the linear cooling members 36_1 to 36_K through the distribution duct. In addition, the internal air of the cooling space may be introduced along the bottom surface of the cooling module 34 and may be circulated back to the cooling space after heat exchange is performed in the evaporator.

The freezing tower 32 may have various cooling structures and is not limited to the embodiments shown.

Figure 4 shows an embodiment of the operating structure of the refrigeration system according to the present invention.

Referring to FIG. 4, the motor may be driven by the engine 11 to operate the compressor 13, or the motor may be operated by a storage battery or a battery connected to the engine 11 and charged. In operation of the compressor 13, the oil mixed with the refrigerant may be separated from the oil separator 43. As described above, the refrigerant may be a R-404A, R-452A, R-455A or similar hydrofluorinated polyolefin (HFO) based refrigerant. And the oil may be a POE (polyolester) of less than 30 wt% of the refrigerant weight, preferably 10 to 15 wt% of a polyolester (POE). The high-temperature and high-pressure gaseous refrigerant in which the oil is separated from the oil separator 43 may be transferred to the condenser 14 to be made of liquid of the high-temperature and high-pressure state and stored in the receiver 44. Since the supply is controlled from the receiver 44, the refrigerant may be transferred to the heat exchanger (42). The refrigerant in the heat exchanger 42 can be made cold and supplied to the ejector 15 via the expansion valve 45 in an appropriate amount. As described above, the refrigerant is supplied to the gas / liquid separator 16 via the diffusion unit 151 formed at the front of the ejector 15, and then is supplied to the evaporator 41 to be evaporated to provide a cooling space CV. Can be cooled. At least a portion of the refrigerant that has evaporated in the evaporator 41 and becomes gaseous may be circulated to the ejector 15, and gas present in the gas / liquid separator 16 may be supplied to the heat exchanger 42. After the heat exchange with the refrigerant supplied from the receiver 44 may be supplied to the compressor (13). This circulation structure allows the cooling space CV to be efficiently cooled by the R-404A, R-452A, R-455A or similar hydrofluorinated polyolefin (HFO) -based refrigerant.

The refrigeration system according to the present invention, for example, by applying a 7.5 KW class R-452A, R-455A or similar HFO-based refrigerant to ensure that the freezing space of the refrigeration tower vehicle is efficiently maintained at a predetermined temperature condition. In addition, the refrigeration system according to the present invention is to ensure the stability of the refrigerant by applying a refrigerant in which R-452A or R-455A and polyolefin is properly mixed. In addition, the refrigeration system according to the invention allows the power consumption to be reduced by effectively controlling the refrigerant circulation cycle.

Although the present invention has been described in detail above with reference to the presented embodiments, those skilled in the art may make various modifications and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. . The invention is not limited by the invention as such variations and modifications but only by the claims appended hereto.

11: engine 12: motor
13: compressor 14: condenser
15: Ejector 16: Gas / Liquid Separator
17: evaporator 18: induction tube
19: proportional control means 21: induction body
22: nozzle unit 23: drive unit
24: uniform flow path 26: feed regulation unit
27: gas supply means 28: evaporation detection unit
31: refrigeration tower car 32: refrigeration tower
33: drive module 34: cooling module
35: distribution plates 36_1 to 36_K: linear cooling member
41: evaporator 42: heat exchanger
43: oil separator 44: receiver
45: expansion side 151: diffusion unit
161: flow control valve 211: gas induction path
221: flow path 222: flow extension path
231: regulating piston 232: pressure regulating member
251: diffusion path 252: uniform pressure space
253: supply path 321: wall surface
322: insulation wall CV: cooling space

Claims (3)

An ejector 15 having a diffusion unit 151 for bringing the refrigerant supplied from the compressor 13 operated by the motor 12 into a low temperature and a reduced pressure state;
A gas / liquid separator 16 for separating the refrigerant transferred from the ejector 15 into a gas and a liquid;
An evaporator 17 for evaporating the refrigerant supplied from the gas / liquid separator 16; And
A proportional control means 19 for regulating the amount of gas supplied from the evaporator 17 to the ejector 15,
The ejector 15 guides the refrigerant derived from the evaporator 17 and the flow path 221 including a control piston 231 which guides the refrigerant supplied from the compressor or the condenser and adjusts its position according to the pressure therein. A gas induction path 211 formed outside of the flow path 221, and a uniform flow path 24 extending with a uniform diameter and connected to the flow path 221 and the gas induction path 211, A flow extension path 222 is formed which extends from the end of the flow path 221 and extends by a certain length into the interior of the uniform flow path 24,
A cooling module 34 installed above the freezing tower 32; A distribution plate 35 disposed on the inner ceiling surface of the cooling module 34; And a plurality of linear cooling members 36_1 to 36_K disposed along the distribution plate 35, each having a plurality of nozzles, wherein the distribution plate 35 is centered with respect to the ceiling surface of the freezing tower 32. A refrigeration system for a refrigeration tower vehicle having a low temperature refractory index refrigerant structure, the portion of which is curved in a downwardly extending convex direction. The refrigerant of claim 1, wherein the refrigerant is R-452A or R-455A, and the oil of the compressor 13 is POE (polyolester), which is 10-15 wt% of the refrigerant weight. Refrigeration system for refrigeration tower car. delete

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