CN218764046U - Refrigerating system and refrigerating unit - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment, and discloses a refrigeration system which comprises a main refrigeration loop and a closed loop, wherein the closed loop is formed by sequentially connecting a compressor, a condenser, a first throttling device and an evaporator; the expander is in transmission connection with the compressor through a transmission shaft; the flash tank is provided with a liquid inlet end, a liquid outlet end and a gas outlet end, the liquid inlet end is connected to the first throttling device through a pipeline, and the liquid outlet end is connected to the evaporator through a pipeline; and one end of the second communication pipeline is connected to the outlet end of the expansion machine, and the other end of the second communication pipeline is connected to a pipeline between the flash tank and the evaporator. The refrigeration system disclosed by the application can effectively improve the refrigeration efficiency of the refrigeration system. The application also discloses a refrigerating unit.

Description

Refrigerating system and refrigerating unit

Technical Field

The present application relates to the technical field of refrigeration equipment, and for example, relates to a refrigeration system and a refrigeration unit.

Background

With the continuous development and progress of science and technology, refrigeration systems are gradually becoming various fields such as building environment equipment, factory production equipment or refrigeration equipment in daily life.

At present, a refrigeration system in the market is mainly a closed loop circuit which is formed by a compressor, a condenser, a throttle valve and an evaporator in sequence, and a refrigerant circulates in the loop to achieve the purpose of refrigeration.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the existing refrigerating system has large heat transfer temperature difference and large irreversible stroke degree, and particularly has low refrigerating efficiency when running under the working condition with large temperature difference.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a refrigeration system and a refrigeration unit, so as to improve the refrigeration efficiency of the refrigeration system.

In some embodiments, the refrigeration system comprises: the refrigeration main loop is a closed loop formed by sequentially connecting a compressor, a condenser, a first throttling device and an evaporator; the expander is in transmission connection with the compressor through a transmission shaft; the evaporator is provided with a liquid inlet end, a liquid outlet end and a gas outlet end, wherein the liquid inlet end is connected to the first throttling device through a pipeline, and the liquid outlet end is connected to the evaporator through a pipeline; one end of the first communication pipeline is connected to the air outlet end of the flash tank, and the other end of the first communication pipeline is connected to the inlet end of the expansion machine; and one end of the second communication pipeline is connected to the outlet end of the expansion machine, and the other end of the second communication pipeline is connected to a pipeline between the flash tank and the evaporator.

In some embodiments, further comprising: and the second throttling device is arranged between the flash tank and the liquid outlet end of the second communication pipeline.

In some embodiments, further comprising: and the flow valve is arranged between the liquid outlet end of the second communication pipeline and the evaporator.

In some embodiments, further comprising: a detection module configured to detect an evaporation pressure of the evaporator; a control module configured to control an opening of the flow valve according to the evaporation pressure.

In some embodiments, further comprising: and the drying filter is arranged at the liquid outlet end of the condenser and is used for drying and filtering the refrigerant flowing out of the condenser.

In some embodiments, further comprising: and the gas-liquid separator is arranged at the gas return end of the compressor.

In some embodiments, further comprising: and the air return pipeline is arranged between the liquid outlet end of the evaporator and the gas-liquid separator.

In some embodiments, further comprising: one end of the bypass branch is connected to a pipeline between the second throttling device and the liquid outlet end of the second communication pipeline, and the other end of the bypass branch is connected to a pipeline between the compressor and the condenser; and the third throttling device is arranged on the bypass branch.

In some embodiments, the first flow restriction device is an expansion valve; and/or the second throttling device is an expansion valve.

In some embodiments, the refrigeration unit includes the refrigeration system described above.

The refrigeration system and the refrigeration unit provided by the embodiment of the disclosure can realize the following technical effects:

the embodiment of the disclosure provides a refrigeration system, through setting up flash tank and expander, the flash tank has the feed liquor end, goes out the liquid end and gives vent to anger the end, and the feed liquor end passes through tube coupling in first throttling arrangement, goes out the liquid end and passes through tube coupling in evaporimeter, and the expander passes through the transmission shaft transmission with the compressor and is connected. A first communication pipeline and a second communication pipeline are additionally arranged, one end of the first communication pipeline is connected to the air outlet end of the flash tank, and the other end of the first communication pipeline is connected to the inlet end of the expansion machine; one end of the second communication pipeline is connected to the outlet end of the expansion machine, and the other end of the second communication pipeline is connected to the pipeline between the flash tank and the evaporator.

The refrigerant flowing out of the flash tank is divided into two paths, one path flows to the expansion machine through the first communication pipeline, and the energy released by the refrigerant in the expansion machine is converted into mechanical work and transmitted to the compressor through the transmission shaft, so that the power consumption of a motor of the compressor is reduced, and the heat transfer temperature difference of the system is reduced.

The refrigerant flowing out of the expander is converged into the main refrigeration loop through the second communication pipeline, is mixed with the refrigerant flowing out of the flash tank and then flows into the evaporator, so that more refrigerant can be provided for the evaporator, and the refrigeration efficiency of the evaporator is improved.

According to the refrigeration system provided by the embodiment of the disclosure, through the flash tank and the expansion machine, the heat transfer temperature difference of the system can be effectively reduced, and the refrigeration efficiency of the system is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic diagram of a refrigeration system provided by an embodiment of the present disclosure;

fig. 2 is a schematic refrigerant flow direction diagram of a refrigeration system according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of another refrigeration system provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of another refrigeration system provided by the embodiment of the disclosure.

Reference numerals:

100: a compressor; 101: a gas-liquid separator; 102: a return gas line; 200: an expander; 300: a condenser; 301: a first throttling device; 302: drying the filter; 400: a flash tank; 401: a second throttling device; 500: an evaporator; 501: a flow valve; 600: a first communicating pipe; 700: a second communication line; 800: a bypass branch; 801: and a third throttling device.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the disclosed embodiments can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

With reference to fig. 1 to 4, an embodiment of the present disclosure provides a refrigeration system, including a main refrigeration circuit, an expander 200, a flash tank 400, a first communication pipeline 600, and a second communication pipeline 700, where the main refrigeration circuit is a closed-loop circuit formed by sequentially connecting a compressor 100, a condenser 300, a first throttling device 301, and an evaporator 500; the expander 200 is in transmission connection with the compressor 100 through a transmission shaft; the flash tank 400 is provided with a liquid inlet end, a liquid outlet end and a gas outlet end, wherein the liquid inlet end is connected to the first throttling device 301 through a pipeline, and the liquid outlet end is connected to the evaporator 500 through a pipeline; one end of the first communication pipeline 600 is connected to the gas outlet end of the flash tank 400, and the other end is connected to the inlet end of the expander 200; the second communication pipe 700 has one end connected to the outlet end of the expander 200 and the other end connected to a pipe between the second throttling means 401 and the evaporator 500.

According to the second law of thermodynamics, heat cannot be spontaneously transferred from a low temperature object to a high temperature object. Therefore, the heat of the low-temperature environment of the mechanical equipment needs to be transferred to the high-temperature environment, that is, the high-temperature environment needs to be cooled. The refrigerating system in the existing mechanical equipment is a closed loop formed by sequentially connecting a compressor, a condenser, a throttle valve and an evaporator, and a refrigerant circularly flows in the closed loop so as to realize the aim of refrigerating in a high-temperature environment.

The refrigeration system has the defects of large heat transfer temperature difference and high irreversible degree, and particularly operates under the condition of large temperature difference between a low-temperature environment and a high-temperature environment, the irreversible degree of the refrigeration system is higher, so that the refrigeration efficiency is poor.

Specifically, a motor of the compressor drives the compressor to operate, so that low-temperature and low-pressure refrigerant saturated gas is subjected to adiabatic compression and then becomes high-temperature and high-pressure refrigerant superheated gas. The high-temperature and high-pressure refrigerant flows into the condenser through the hot gas to be condensed into medium-pressure and high-temperature refrigerant supercooling liquid in an isobaric manner. The medium-pressure high-temperature refrigerant subcooled liquid is changed into a low-temperature low-pressure refrigerant gas-liquid mixture through the throttle valve, flows into the evaporator, and is evaporated into low-temperature low-pressure refrigerant saturated gas through the evaporator. The low-temperature and low-pressure refrigerant saturated gas flows into the compressor again to continue circulation.

In the circulation process, the higher the internal energy consumed by the operation of the motor of the compressor is, the higher the temperature of the compressor is, so that the higher the exhaust temperature of the compressor is, the refrigerant is not easy to be condensed by the condenser, and the refrigeration efficiency is reduced. Therefore, when the existing refrigerating system operates in an environment with large temperature difference, the heat engine efficiency is low, the heat transfer temperature difference is large, and the irreversible stroke degree is high, so that the refrigerating efficiency of the refrigerating system is low.

Based on this, in the refrigeration system provided by the embodiment of the present disclosure, by providing the flash tank 400 and the expander 200, the flash tank 400 has a liquid inlet end, a liquid outlet end, and a gas outlet end, the liquid inlet end is connected to the first throttling device 301 through a pipeline, the liquid outlet end is connected to the evaporator 500 through a pipeline, and the expander 200 is in transmission connection with the compressor 100 through a transmission shaft. A first communicating pipeline 600 and a second communicating pipeline 700 are additionally arranged, one end of the first communicating pipeline 600 is connected to the air outlet end of the flash tank 400, and the other end is connected to the inlet end of the expander 200; the second communication pipe 700 has one end connected to the outlet end of the expander 200 and the other end connected to a pipe between the second throttling means 401 and the evaporator 500.

The refrigerant flowing out of the flash tank 400 is divided into two paths, one path flows to the expander 200 through the first communication line 600, and the energy released by the refrigerant expanding in the expander 200 is converted into mechanical work and transmitted to the compressor 100 through the transmission shaft, so that the power consumption of the compressor motor is reduced. Further, the temperature of the compressor 100 itself is lowered, and thus the discharge temperature of the compressor 100 is effectively lowered, thereby reducing the heat transfer temperature difference of the refrigeration system and improving the refrigeration efficiency of the refrigeration system.

The refrigerant flowing out of the expander 200 is merged into the main refrigeration circuit through the second communication pipe 700, and mixed with the refrigerant flowing out of the flash tank 400 and then flows into the evaporator 500, so that more refrigerant can be provided to the evaporator 500, and the refrigeration efficiency of the evaporator 500 is improved.

According to the refrigeration system provided by the embodiment of the disclosure, the heat transfer temperature difference of the system can be effectively reduced and the refrigeration efficiency of the system is improved through the flash tank 400 and the expander 200.

In the embodiment of the present disclosure, the refrigeration system may be applied to a refrigeration device such as an air conditioner, a refrigerator, or a refrigeration unit, which is not particularly limited.

Optionally, the refrigeration system further includes a second throttling device 401, and the second throttling device 401 is disposed between the flash tank 400 and the liquid outlet end of the second communication pipe.

By arranging the second throttling device 401 between the flash tank 400 and the liquid outlet end of the second communication pipeline 700, the refrigerant flowing out of the flash tank 400 is more favorably flowed into the evaporator 500 for evaporation after being throttled by the second throttling device 401.

Specifically, the low-temperature and low-pressure refrigerant saturated gas flows through the compressor 100, and becomes a high-temperature and high-pressure refrigerant superheated gas after adiabatic compression. The high-temperature high-pressure refrigerant superheated air flow passes through the condenser 300 and is condensed into medium-pressure high-temperature refrigerant supercooling liquid through isobaric pressure. After the supercooled liquid of the medium-temperature and high-temperature refrigerant flows through the first throttling device 301, isenthalpic expansion is performed to obtain a gas-liquid mixture of the medium-temperature and medium-temperature refrigerant.

The gas-liquid mixture of the refrigerant at the intermediate temperature and the intermediate pressure flows through the flash tank 400, and the gas phase and the liquid phase are separated from the flash tank 400 and are respectively in the states of saturated gas at the intermediate temperature and the intermediate pressure and saturated liquid.

The sub-medium temperature and medium pressure saturated liquid flows through the second throttling device 401, is subjected to isenthalpic expansion to be changed into a low-temperature and low-pressure refrigerant gas-liquid mixture, enters the evaporator 500, is subjected to isobaric evaporation in the evaporator 500 to form low-temperature and low-pressure refrigerant saturated gas, the low-temperature and low-pressure refrigerant saturated gas flows into the compressor 100 and is subjected to adiabatic compression by the compressor 100, and the refrigerant continues to perform circulating refrigeration.

The sub-medium temperature and medium pressure saturated gas of the flash tank 400 enters the expander 200 through the first communication pipe 600, and is changed into a low temperature and low pressure refrigerant gas-liquid mixture after adiabatic expansion. The low-temperature and low-pressure refrigerant gas-liquid mixture flows into the main refrigeration circuit through the second communication line 700, and is mixed with the low-temperature and low-pressure refrigerant gas-liquid mixture flowing out of the second throttle device 401, and then enters the evaporator 500.

The evaporator 500 is supplied with a larger amount of refrigerant through the second communication pipe 700, so that the refrigeration efficiency of the evaporator 500 can be improved.

Optionally, the refrigeration system further includes a flow valve 501, and the flow valve 501 is disposed between the liquid outlet end of the second communication pipeline 700 and the evaporator 500.

The liquid refrigerant flowing into the evaporator 500 is evaporated by the evaporator 500 to be changed into a gaseous refrigerant, and the gaseous refrigerant flows into the compressor 100 to be compressed.

If the amount of refrigerant flowing into the evaporator 500 is too small, the evaporator 500 may be left without a part of the evaporation space, and the area of the part of the evaporation space may serve as a heater for the gas of the evaporator 500 to overheat the gaseous refrigerant, thereby increasing the suction temperature and the discharge temperature of the compressor 100. In case that the suction temperature and the discharge temperature of the compressor 100 are increased, a heat transfer temperature difference of the refrigeration system may be increased, thereby reducing a refrigeration effect of the refrigeration system.

If the amount of the refrigerant flowing into the evaporator 500 is too large, the evaporator 500 is filled with the refrigerant, and the amount of the refrigerant flowing into the evaporator 500 is gradually increased. Thus, on the one hand, since the heat exchange capacity of the evaporator 500 is limited, the refrigerant flowing into the evaporator 500 may not be completely evaporated into the gaseous refrigerant, and further, a part of the refrigerant may flow into the compressor 100, thereby causing liquid impact on the compressor 100 and damage to the compressor 100. On the other hand, an excessive amount of refrigerant flowing into the evaporator 500 may cause frost formation of the evaporator 500, thereby reducing a cooling effect.

In the refrigeration system according to the embodiment of the present disclosure, the refrigerant flowing into the evaporator 500 includes a refrigerant flowing out of the second throttling device 401 and a refrigerant flowing into the second communication pipe 700. Furthermore, the flow valve 501 is arranged between the liquid outlet end of the second communication pipeline 700 and the evaporator 500, the amount of refrigerant flowing into the evaporator 500 is controlled through the opening degree of the flow valve 501, the liquid impact fault of the compressor 100 can be effectively avoided, and therefore the service life of the compressor 100 is effectively guaranteed, and the overall performance of the refrigeration system can be guaranteed.

Optionally, the refrigeration system further comprises a detection module configured to detect the evaporation pressure of the evaporator 500 and a control module; the control module is configured to control the opening of the flow valve 501 in accordance with the evaporation pressure.

The evaporation pressure of the evaporator 500 may vary due to an excessive or insufficient amount of refrigerant, a change in the ambient temperature of the evaporator 500, and the like. While a decrease in the evaporation pressure may cause the evaporator 500 to frost, an increase in the evaporation pressure may affect the cooling efficiency of the refrigeration system.

Therefore, by providing a detection module to detect the evaporation pressure of the evaporator 500, the control module controls the opening degree of the flow valve 501 according to the evaporation pressure detected by the detection module. Thus, the opening of the flow valve 501 is flexibly adjusted according to the evaporation pressure, thereby effectively preventing the evaporator 500 from frosting and ensuring the refrigeration efficiency of the refrigeration system.

Optionally, the refrigeration system further includes a dry filter 302, where the dry filter 302 is disposed at the liquid outlet end of the condenser 300, and is configured to dry and filter the refrigerant flowing out of the condenser 300.

Because the refrigerant has impurities such as residual moisture, solid powder and the like in the process of the refrigeration cycle, the impurities can cause the blockage of the throttling device, thereby influencing the normal operation of the refrigeration system. Therefore, in order to prevent the throttle device from being clogged with impurities, the refrigerant system needs to be provided with a dry filter 302 for filtration.

By arranging the dry filter 302 at the liquid outlet end of the condenser 300, the refrigerant is filtered before being split by the first throttling device 301, and the problem that the refrigeration system cannot normally operate due to blockage of the first throttling device 301 is effectively avoided.

Optionally, the refrigeration system further includes a gas-liquid separator 101, and the gas-liquid separator 101 is disposed at a gas return end of the compressor 100.

Since the gaseous refrigerant flowing out of the evaporator 500 may contain a liquid refrigerant, the liquid refrigerant may cause a liquid impact failure on the compressor 100. Therefore, by providing the gas-liquid separator 101 at the gas return end of the compressor 100, the refrigerant flowing out of the evaporator 500 is subjected to gas-liquid separation by the gas-liquid separator 101. The gas-liquid separator 101 separates and accommodates part of the liquid refrigerant that may be contained, thereby preventing the liquid refrigerant from flowing into the compressor 100, and effectively avoiding the liquid impact fault on the compressor 100. While effectively ensuring the service life of the compressor 100, the overall performance of the refrigeration system can also be ensured.

Optionally, the refrigeration system further comprises a gas return line 102, and the gas return line 102 is disposed between the liquid outlet end of the evaporator 500 and the gas-liquid separator 101.

By additionally arranging the return air pipeline 102, the path length of the refrigerant flowing into the compressor 100 from the evaporator 500 is effectively prolonged, and the heat exchange time of the refrigerant can be effectively prolonged, so that the occurrence of liquid impact faults can be further reduced, and the stability of the refrigeration system in the operation process is improved.

Optionally, the return line 102 is helically disposed.

By arranging the return air pipeline 102 in a spiral form, the occupied space of the return air pipeline 102 can be effectively reduced, so that the refrigeration equipment can be conveniently installed in the refrigeration equipment, and meanwhile, the volume of the refrigeration equipment can be effectively reduced.

Optionally, the refrigeration system further includes a bypass branch 800 and a third throttling device 801, one end of the bypass branch 800 is connected to the pipeline between the second throttling device 401 and the liquid outlet end of the second communication pipeline 700, and the other end is connected to the pipeline between the compressor 100 and the condenser 300; the third throttling device 801 is disposed in the bypass branch 800.

After the refrigeration system is operated for a period of time, especially at a lower temperature for a period of time, a layer of frost forms on the surface of the evaporator 500, and the existence of the frost layer affects the cold exchange of the evaporator 500, thereby reducing the refrigeration efficiency of the refrigeration system.

Specifically, the evaporator 500 isobarically evaporates the low-temperature and low-pressure refrigerant gas-liquid mixture into low-temperature and low-pressure refrigerant saturated gas to absorb heat, so as to achieve the purpose of cooling the environment where the evaporator 500 is located.

On the one hand, the heat absorption requires the circulation of air, and the air with higher temperature flows across the surface of the evaporator 500 to provide heat for the evaporator 500 and simultaneously reduce the temperature of the air flowing across the surface of the evaporator 500. When air with a high temperature flows across the surface of the evaporator 500, water molecules in the air are condensed, thereby generating condensed water on the surface of the evaporator 500. When the circulation amount of the air is insufficient, the surface temperature of the evaporator 500 is gradually lowered, so that the condensed water on the surface of the evaporator 500 is condensed into frost.

On the other hand, in case that the temperature of the environment of the evaporator 500 is low and the evaporator 500 needs to absorb heat, the temperature of the evaporator 500 is lower, and the condensed water generated when the air passes through the surface of the evaporator 500 is quickly condensed into frost. As the temperature of the environment in which the evaporator 500 is located is lower, the frosting speed on the surface of the evaporator 500 is increased.

In addition, when the amount of refrigerant is too small, the refrigerant is evaporated from the inlet end of the evaporator 500. Since the amount of refrigerant is too small, the refrigerant can be completely evaporated without flowing to the outlet end of the evaporator 500, and thus the inlet end of the evaporator 500 is more easily frosted than the outlet end.

When the amount of the refrigerant is excessive, the refrigerant flows to the outlet end of the evaporator 500 to be evaporated due to the limited heat exchange capacity of the evaporator 500. Therefore, in the case of an excessive amount of refrigerant, the outlet end of the evaporator 500 is more likely to be frosted than the inlet end.

The reasons why the evaporator 500 is frosted include a dirty portion inside the evaporator 500, a low efficiency of the compressor 100, and the like, which are not listed here.

Accordingly, by providing the bypass branch 800, one end of the bypass branch 800 is connected to the pipeline between the second throttling device 401 and the liquid outlet end of the second communicating pipeline 700, and the other end is connected to the pipeline between the compressor 100 and the condenser 300, so that the high-temperature refrigerant flowing out of the compressor 100 flows into the evaporator 500 through the bypass branch 800. With such an arrangement, the temperature of the evaporator 500 can be effectively increased, so that the evaporator 500 can be effectively prevented from frosting or the evaporator 500 can be defrosted.

The third throttling device 801 is provided in the bypass branch 800 to regulate the refrigerant flow rate of the bypass branch 800. Further, the third throttling device 801 is opened and closed and the opening degree is adjusted, so that defrosting of the evaporator 500 is realized, and the cooling capacity exchange efficiency of the evaporator 500 is improved.

Optionally, the refrigeration system further comprises a temperature sensor for detecting the real-time temperature of the surface of the evaporator 500; the control module is also configured to adjust the opening degree of the third throttling means 801 according to the real-time temperature of the surface of the evaporator 500.

By providing a temperature sensor to detect the surface temperature of the evaporator 500, when the real-time temperature of the surface of the evaporator 500 is lower than the preset temperature, the control module controls the third throttling device 801 to be turned on, thereby preventing the surface of the evaporator 500 from frosting.

Further, the control module adjusts the opening degree of the third throttling device 801 according to the temperature difference between the real-time temperature and the preset temperature, and the opening degree of the third throttling device 801 is adjusted to be increased along with the temperature difference until the third throttling device 801 is completely opened.

In case the real-time temperature of the surface of the evaporator 500 is equal to or higher than the preset temperature, the control module controls the third throttling device 801 to be turned off.

By flexibly controlling the opening and closing of the third throttling device 801 and the opening degree adjustment according to the real-time temperature of the surface of the evaporator 500, the refrigeration efficiency of the refrigeration system can be effectively improved.

Optionally, the first throttling device 301 is an expansion valve; and/or the second flow restriction 401 is an expansion valve.

The first throttling device 301 and the second throttling device 401 adopt expansion valves, and the expansion valves can perform throttling function, and can control the opening degree of the expansion valves according to detection and data acquisition of multiple parameters such as superheat degree or set values, so that the refrigerant flow meets the requirement of the load of a refrigeration system.

Therefore, the refrigerating effect of the refrigerating system can be effectively improved.

Optionally, an embodiment of the present disclosure provides a refrigeration unit, including the refrigeration system described above.

The refrigerating unit adopting the refrigerating system can effectively reduce the heat transfer temperature difference of the system and improve the refrigerating efficiency of the system.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A refrigeration system, comprising:

the refrigeration main loop is a closed loop formed by sequentially connecting a compressor, a condenser, a first throttling device and an evaporator;

the expander is in transmission connection with the compressor through a transmission shaft;

the flash tank is provided with a liquid inlet end, a liquid outlet end and a gas outlet end, the liquid inlet end is connected to the first throttling device through a pipeline, and the liquid outlet end is connected to the evaporator through a pipeline;

one end of the first communication pipeline is connected to the gas outlet end of the flash tank, and the other end of the first communication pipeline is connected to the inlet end of the expansion machine;

and one end of the second communication pipeline is connected to the outlet end of the expansion machine, and the other end of the second communication pipeline is connected to a pipeline between the flash tank and the evaporator.

2. The refrigerant system as set forth in claim 1, further including:

and the second throttling device is arranged between the flash tank and the liquid outlet end of the second communication pipeline.

3. The refrigerant system as set forth in claim 2, further including:

and the flow valve is arranged between the liquid outlet end of the second communication pipeline and the evaporator.

4. The refrigerant system as set forth in claim 3, further including:

a detection module configured to detect an evaporation pressure of the evaporator;

a control module configured to control an opening of the flow valve according to the evaporation pressure.

5. The refrigerant system as set forth in claim 2, further including:

and the drying filter is arranged at the liquid outlet end of the condenser and is used for drying and filtering the refrigerant flowing out of the condenser.

6. The refrigerant system as set forth in claim 2, further including:

and the gas-liquid separator is arranged at the gas return end of the compressor.

7. The refrigerant system as set forth in claim 6, further including:

and the air return pipeline is arranged between the liquid outlet end of the evaporator and the gas-liquid separator.

8. The refrigerant system as set forth in claim 2, further including:

one end of the bypass branch is connected to a pipeline between the second throttling device and the liquid outlet end of the second communication pipeline, and the other end of the bypass branch is connected to a pipeline between the compressor and the condenser;

and the third throttling device is arranged on the bypass branch.

9. The refrigeration system according to any one of claims 2 to 8,

the first throttling device is an expansion valve; and/or the presence of a gas in the atmosphere,

the second throttling device is an expansion valve.

10. A refrigeration unit comprising a refrigeration system as claimed in any one of claims 1 to 9.

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