CN114279097A - Refrigerator refrigerating system, refrigerator and refrigerating method - Google Patents
Refrigerator refrigerating system, refrigerator and refrigerating method Download PDFInfo
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- CN114279097A CN114279097A CN202111526169.7A CN202111526169A CN114279097A CN 114279097 A CN114279097 A CN 114279097A CN 202111526169 A CN202111526169 A CN 202111526169A CN 114279097 A CN114279097 A CN 114279097A
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Abstract
The invention provides a refrigerator refrigerating system, a refrigerator and a refrigerating method, relates to the technical field of refrigerating equipment, and solves the technical problems that in the prior art, the storage temperature of frozen food of the refrigerator is mostly below twenty ℃ below zero, the evaporation pressure is low, the indoor temperature is high (the indoor heating temperature is high in winter), the condensation pressure is high, and a compressor is required to work under the condition of a large pressure ratio continuously, so that the load is large, and the service life is short. The refrigerating system comprises a refrigerant refrigerating system and a cold carrying system, wherein the cold carrying system comprises a subcooler and an air cooler, the subcooler is connected with the refrigerant refrigerating system, and a control valve of the refrigerator refrigerating system is adjusted to enable a refrigerant discharged from a refrigerant refrigerating system compressor to be condensed only through a condenser or condensed only through the subcooler or condensed sequentially through the condenser and the subcooler. The invention can utilize the air with lower temperature in the external environment to cool the refrigerant, improve the supercooling degree, reduce the pressure ratio of the compressor and prolong the service life of the compressor.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigerator refrigeration system, a refrigerator and a refrigeration method.
Background
The requirements of people on food are gradually biased to health and freshness, and people pay attention to the freshness and health while paying attention to nutrition. The freezers used for selling frozen food in shops and supermarkets are mostly self-carrying freezers, the preservation temperature of the frozen food is mostly below twenty degrees below zero, the evaporation pressure is low, the indoor temperature is high (the indoor heating temperature in winter is high), the condensation pressure is high, a compressor continuously works under the condition of a high pressure ratio, the load is large, the energy consumption is high, and the service life is short.
Disclosure of Invention
The invention aims to provide a refrigerator refrigerating system, a refrigerator and a refrigerating method, which solve the technical problems of large load and short service life caused by the fact that in the prior art, the storage temperature of frozen food of the refrigerator is mostly below twenty ℃ below zero, the evaporation pressure is low, the indoor temperature is high, the condensation pressure is high, and a compressor needs to work under the condition of a high pressure ratio continuously. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a refrigerator refrigerating system which comprises a refrigerant refrigerating system and a cold carrying system, wherein the cold carrying system comprises a subcooler and an outdoor air cooler, the subcooler is connected with the refrigerant refrigerating system, and a control valve of the refrigerator refrigerating system is adjusted to enable a refrigerant discharged from a compressor of the refrigerant refrigerating system to be condensed only through a condenser of the refrigerant refrigerating system or condensed only through the subcooler or condensed sequentially through the condenser and the subcooler.
Furthermore, a first liquid outlet pipe and a second liquid outlet pipe which are connected in parallel are formed on the outlet side of the condenser of the refrigerant refrigeration system, the subcooler is arranged on the first liquid outlet pipe, the control valves are arranged on the first liquid outlet pipe and the second liquid outlet pipe, and the control valve on the first liquid outlet pipe is positioned on the inlet side of the subcooler.
Furthermore, the air cooler is provided with a temperature sensor for detecting the external temperature, the temperature sensor is connected with the control device of the refrigerator refrigerating system, and when the external environment temperature reaches the available temperature and needs to be increased, the control device can control the control valve so that the refrigerant discharged by the compressor can sequentially pass through the condenser and the subcooler.
Further, the freezer refrigeration system includes a first compressor and a second compressor, the first compressor with the second compressor series connection.
Further, the first compressor is a high-pressure stage compressor, the second compressor is a low-pressure stage compressor, and an outlet side of the second compressor is connected with the first compressor through a pipeline.
Furthermore, the refrigerant refrigeration system comprises a third connecting pipeline and a fourth connecting pipeline connected with the third connecting pipeline in parallel, the first compressor is arranged on the third connecting pipeline, valve bodies are arranged on the third connecting pipeline and the fourth connecting pipeline, and the valve bodies on the third connecting pipeline are located on the liquid inlet side of the first compressor.
Furthermore, the refrigerant refrigerating system also comprises an air supplementing loop structure for supplementing air to the first compressor.
Further, freezer refrigerating system still includes vapour and liquid separator, vapour and liquid separator with the subcooler is connected, vapour and liquid separator's gas outlet through the backflow pipeline with first compressor with pipeline between the second compressor is connected, set up the valve body on the backflow pipeline, vapour and liquid separator's liquid outlet with freezer refrigerating system's evaporimeter is connected, just vapour and liquid separator with set up throttling arrangement between the evaporimeter.
Further, a throttling device is arranged on the inlet side of the gas-liquid separator.
A refrigerator comprises the refrigerator refrigerating system.
A refrigeration method for refrigerating by using the refrigerator refrigeration system comprises the following steps: calculating the temperature difference value Delta T of the refrigerants at the inlet side and the outlet side of the condenser1(ii) a Judging the temperature difference value Delta T1And the preset supercooling degree set value T in the systemIs provided withThe relationship of (1): if the temperature difference value is Delta T1Less than the preset supercooling degree set value T in the systemIs provided withControlling the control valve to enable the refrigerant flowing out of the condenser to flow to the subcooler and to control the secondary refrigerant in the secondary cooling system to circularly flow if the temperature difference value delta T1Is not less than the supercooling degree set value T preset in the systemIs provided withAnd controlling the control valve to enable the refrigerant flowing out of the condenser to bypass the subcooler to circularly flow in the refrigerant refrigeration system.
Further, the temperature difference value Delta T of the refrigerants on the inlet side and the outlet side of the condenser is calculated1The method comprises the following steps: detecting a temperature T at an outlet side of the condenser1Detecting the pressure P at the inlet side of the condenser, and calculating the corresponding saturation temperature T at the pressure according to the pressure P2Then, the value of temperature difference Δ T1＝|T1-T2|。
Further, the following contents are also included: calculating the temperature difference value Delta T of the refrigerants at the inlet side and the outlet side of the subcooler2(ii) a When temperature difference value delta T1Less than the preset supercooling degree set value T in the systemIs provided withJudging the temperature difference value Delta T1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler; wherein, Delta T2＝|T3-T4|，T3Is the temperature value, T, of the refrigerant outlet side of the subcooler4The temperature value of the refrigerant inlet side of the subcooler.
Further, the temperature difference value Delta T is judged1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler, comprising: when Δ T1+△T2>TIs provided withControlling and reducing the fan frequency on the cold carrying system; when Δ T1+△T2≤TIs provided withAnd controlling to increase the fan frequency.
Further, the temperature difference value Delta T is judged1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler, comprising: when Δ T1+△T2>TIs provided withControlling to reduce the flow of the secondary refrigerant flowing to the subcooler; when Δ T1+△T2≤TIs provided withAnd controlling to increase the flow of the secondary refrigerant flowing to the subcooler.
Further, detecting the outdoor air temperature, and when the outdoor air temperature is not greater than a preset temperature value, calculating the temperature difference value delta T of the refrigerants on the inlet side and the outlet side of the condenser1。
The invention provides a refrigerating system of a refrigerator, which can utilize air with lower temperature in the external environment to cool a refrigerant, improve the supercooling degree and reduce the pressure ratio of a compressor, and comprises the following specific steps: the refrigerator refrigeration system comprises a refrigerant refrigeration system and a cold carrying system, wherein the cold carrying system comprises a subcooler and an air cooler, the subcooler is connected with the refrigerant refrigeration system, and a control valve of the refrigerator refrigeration system is adjusted to enable a refrigerant discharged from a compressor of the refrigerant refrigeration system to be condensed only through a condenser or sequentially through the condenser and the subcooler. When the external environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged by the condenser needs to be improved, the control valve is adjusted, so that the refrigerant discharged from the compressor sequentially passes through the condenser and the subcooler, the refrigerant enters the subcooler after heat exchange with indoor air through the condenser, heat exchange is carried out between the refrigerant and the secondary refrigerant in the subcooler, the temperature of the refrigerant is reduced again, and the refrigerant of unit mass generates better refrigeration effect; when the external environment temperature reaches the available temperature but does not need to increase the supercooling degree of the refrigerant discharged by the condenser and does not reach the available temperature (the outdoor temperature is higher than the preset temperature value in the system), the refrigerant flowing out of the condenser bypasses the subcooler to flow in the refrigerant refrigerating system, namely the refrigerant flowing out of the condenser does not pass through the condenser and the cold carrying system does not work.
The preferred technical scheme of the invention can at least produce the following technical effects:
the refrigerant refrigeration system comprises a first compressor and a second compressor, wherein the first compressor and the second compressor are connected in series, and the two compressors work under a proper pressure ratio condition, namely the compressors are matched according to different refrigeration requirements, so that the efficiency is improved, the power consumption of the compressors is reduced, and the load of the compressors is reduced;
refrigerant gas is mixed with refrigerant gas from a second compressor (low-pressure stage compressor) through a high-pressure gas pipeline (return pipeline) to reach an inlet of a first compressor (high-pressure stage compressor), so that the problem of low suction pressure of the high-pressure stage compressor is solved;
the system can arrange the opening and closing of the secondary cooling system and the flow of the secondary refrigerant according to the refrigeration requirement in the cabinet, and avoids the waste of electric power.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a cooler provided by an embodiment of the present invention;
fig. 2 is a wiring schematic of a freezer refrigeration system provided by an embodiment of the present invention;
fig. 3 is a flowchart of supercooling degree control of the refrigerator according to the embodiment of the present invention.
FIG. 1-high pressure stage compressor; 2-a condenser; 3-a subcooler; 4-a gas-liquid separator; 5-an evaporator; 6-low pressure stage compressor; 7-a circulating pump; 8-an air cooler; 9-a fan; 10-a first valve; 11-first throttling means; 12-a second valve; 13-second throttling means; 14-a third valve; 15-a fourth valve; 16-a fifth valve; 17-sixth valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The freezer that is used for selling frozen food in shop and supermarket is mostly the self-carrying formula freezer (the evaporimeter and the condenser of freezer all are located indoorly), and the save temperature of frozen food is mostly below twenty degrees below zero, and evaporating pressure is low, and indoor temperature is higher (winter indoor heating temperature is higher), and condensing pressure is higher, and the compressor will last to work under the condition of big pressure ratio, and the load is big, and the energy consumption is high, and is longe-lived. Based on the above, the invention provides a refrigerator refrigeration system, which can utilize air with lower temperature in the external environment to cool the refrigerant, improve the supercooling degree and reduce the pressure ratio of a compressor, and comprises the following specific steps: the air-conditioning system comprises a refrigerant refrigerating system and a cold carrying system, wherein the cold carrying system comprises a subcooler 3 and an outdoor air cooler 8, the subcooler 3 is connected with the refrigerant refrigerating system, and a control valve of the refrigerator refrigerating system is adjusted to enable a refrigerant discharged from a compressor of the refrigerant refrigerating system to be condensed only through a condenser 2 of the refrigerant refrigerating system or condensed only through the subcooler 3 or condensed sequentially through the condenser 2 and the subcooler 3. The cold-carrying system adopts the cold-carrying agent which can not be frozen at a lower temperature, for example, the cold-carrying agent can be glycol, the cold-carrying agent is cooled by a natural cold source after passing through the air cooler 8, the temperature is reduced, then the heat exchange between the low-temperature cold-carrying agent and the refrigerant coming out of the condenser 2 is realized in the subcooler 3, and the refrigerant is cooled to be subcooled.
When the external environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged from the condenser 2 needs to be improved, the control valve is adjusted, so that the refrigerant discharged from the compressor sequentially passes through the condenser 2 and the subcooler 3, the refrigerant enters the subcooler 3 after the heat exchange between the condenser 2 and the indoor air, the heat exchange between the refrigerant and the secondary refrigerant occurs in the subcooler 3, the temperature of the refrigerant is reduced again, the refrigerant with unit mass generates better refrigeration effect, and the pressure ratio of the compressor can be reduced; when the external environment temperature reaches the utilizable temperature but does not need to increase the supercooling degree of the refrigerant discharged from the condenser 2, and when the external environment temperature does not reach the utilizable temperature (the outdoor temperature is higher than the preset temperature value in the system), the refrigerant flowing out of the condenser 2 bypasses the subcooler 3 to flow in the refrigerant refrigeration system, namely, the refrigerant flowing out of the condenser 2 does not pass through the condenser 3, and the cooling system does not work.
As an optional implementation manner, a first liquid outlet pipe and a second liquid outlet pipe which are connected in parallel are formed at an outlet side of the refrigerant refrigeration system condenser 2, the subcooler 3 is arranged on the first liquid outlet pipe, control valves are arranged on the first liquid outlet pipe and the second liquid outlet pipe, and the control valve on the first liquid outlet pipe is located at an inlet side of the subcooler 3. Referring to fig. 2, it is shown that the first outlet pipe is provided with a third valve 14 and a subcooler 3, and the second outlet pipe is provided with a fourth valve 15. When the refrigerant to flow out of the condenser 2 bypasses the subcooler 3 and flows in the refrigerant refrigeration system, the third valve 14 needs to be closed and the fourth valve 15 needs to be opened, and when the refrigerant to flow out of the condenser 2 flows into the subcooler 3, the third valve 14 needs to be opened and the fourth valve 15 needs to be closed. If the third valve 14 is opened and the fourth valve 15 is opened, the refrigerant flowing out of the condenser 2 flows into the first liquid outlet pipe and the second liquid outlet pipe.
Of course, according to the circumstances, a control valve and a pipeline of the system may be added, so that the refrigerant discharged from the compressor passes through the subcooler 3 only and does not pass through the condenser 2, and at this time, the subcooler 3 is used for condensing the refrigerant discharged from the compressor.
The air cooler 8 is provided with a temperature sensor for detecting the external temperature, the temperature sensor is connected with a control device of the refrigerator refrigerating system, and when the external environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged from the condenser 2 needs to be improved, the control device can control the control valve so that the refrigerant discharged from the compressor can sequentially pass through the condenser 2 and the subcooler 3. The cold carrying system further comprises a circulating pump 7, a subcooler 3 and an air cooler 8 which are connected to form a closed loop structure, a valve body is arranged on the cold carrying system, and a first valve 10 is arranged between the air cooler 8 and the circulating pump 7, which is shown in fig. 2. When the external environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged by the condenser 2 needs to be improved, the third valve 14 is opened, the fourth valve 15 is closed, the first valve 10 is opened, the circulating pump 7 is started, and the cold carrying system starts to work. Air with low external temperature is introduced into the subcooler 3 through the secondary refrigerant, and the secondary refrigerant in the subcooler 3 exchanges heat with the refrigerant flowing to the subcooler 3 in the subcooler 3, so that the purpose of providing supercooling degree for cooling the refrigerant by using a low-temperature cold source is achieved. When the external environment temperature reaches the available temperature but does not need to increase the supercooling degree of the refrigerant discharged from the condenser 2, and when the external environment temperature does not reach the available temperature (the outdoor temperature is higher than the preset temperature value in the system), the first valve 10 is closed, the circulating pump 7 stops working, the third valve 14 is closed, and the fourth valve 15 is opened.
As an alternative embodiment, the refrigerant refrigeration system includes a first compressor 1 and a second compressor 6, and the first compressor 1 and the second compressor 6 are connected in series. Referring to fig. 2, a first compressor 1 and a second compressor 6 are illustrated, when the temperature in the refrigerator is relatively high, the first compressor 1 or the second compressor 6 can be started, so that the requirement of refrigeration can be met, and when the temperature in the refrigerator is relatively low, the first compressor 1 and the second compressor 6 can be started. The two compressors work under the condition of proper pressure ratio, and the load of the compressors is reduced. Preferably, the first compressor 1 is a high-pressure stage compressor, the second compressor 6 is a low-pressure stage compressor, and the outlet side of the second compressor 6 is connected to the first compressor 1 through a pipe.
Referring to fig. 2, the refrigerant refrigeration system includes a third connection pipeline and a fourth connection pipeline connected in parallel to the third connection pipeline, the first compressor 1 is disposed on the third connection pipeline, valve bodies are disposed on the third connection pipeline and the fourth connection pipeline, and the valve body on the third connection pipeline is located on the liquid inlet side of the first compressor 1, referring to fig. 2, a sixth valve 17 on the third connection pipeline and a fifth valve 16 on the fourth connection pipeline are shown, when the temperature in the refrigerator is relatively high, the second compressor 6 can be started only, at this time, the first compressor 1 is not started, the sixth valve 17 is closed, the fifth valve 16 is opened, and the refrigerant discharged from the second compressor 6 is discharged to the condenser 2 through the fifth valve 16; when the temperature of the refrigerator is low, the first compressor 1 and the second compressor 6 can be started simultaneously, at this time, the sixth valve 17 is opened, the fifth valve body 16 is closed, the refrigerant discharged from the second compressor 6 flows to the first compressor 1, and the refrigerant discharged from the first compressor 1 flows to the condenser 2.
As an optional implementation manner, the refrigerant refrigeration system further includes a gas supplementing loop structure for supplementing gas to the first compressor 1. The structure of the air supply circuit is specifically described as follows: referring to fig. 2, the refrigerator refrigeration system further includes a gas-liquid separator 4, the gas-liquid separator 4 is connected to the subcooler 3, a gas outlet of the gas-liquid separator 4 is connected to a pipeline between the first compressor 1 and the second compressor 6 through a return pipe, a valve body is arranged on the return pipe, a liquid outlet of the gas-liquid separator 4 is connected to an evaporator 5 of the refrigerator refrigeration system, a throttling device is arranged between the gas-liquid separator 4 and the evaporator 5, preferably, a throttling device is arranged at an inlet side of the gas-liquid separator 4, referring to fig. 2, a first throttling device 11 located at the inlet side of the gas-liquid separator 4 is shown, and a connection point of the first liquid outlet pipe and the second liquid outlet pipe is located at a liquid inlet side of the first throttling device 11.
The refrigerant enters the gas-liquid separator 4 after passing through the first throttling device 11, and the high-pressure refrigerant gas separated by the gas-liquid separator 4 enters the high-pressure gas pipeline (return pipeline). The refrigerant liquid separated by the gas-liquid separator 4 passes through the second throttling device 13 and flows to the evaporator 5, and the refrigerant absorbs heat in the evaporator 5 and then flows to the second compressor 6. A second valve 12 is arranged on the high-pressure gas pipeline, when the first compressor 1 does not work, the sixth valve 17 is closed, the fifth valve body 16 is opened, and refrigerant gas discharged from the high-pressure gas pipeline is directly discharged to the condenser 2 through the fifth valve body 16; when the first compressor 1 works, the sixth valve 17 is opened, the fifth valve body 16 is closed, refrigerant gas compressed by the second compressor 6 is mixed with refrigerant gas in a high-pressure gas pipeline (return pipeline) and then enters the first compressor 1 for compression, the high-pressure gas pipeline forms an air supplementing loop structure, and the problem of low suction pressure of the first compressor 1 (high-pressure compressor) is solved by air supplementing of the first compressor 1.
A refrigerator comprises the refrigerator refrigerating system provided by the invention. This freezer refrigerating system can utilize the lower temperature air of external environment to cool off the refrigerant, improves the subcooling degree, specifically as follows: the air-conditioning system comprises a refrigerant refrigerating system and a cold carrying system, wherein the cold carrying system comprises a subcooler 3 and an air cooler 8, the subcooler 3 is connected with the refrigerant refrigerating system, and a control valve of the refrigerator refrigerating system is adjusted to enable a refrigerant discharged from a refrigerant refrigerating system compressor to be condensed only through a condenser 2 or condensed only through the subcooler 3 or condensed sequentially through the condenser 2 and the subcooler 3. The cold-carrying system adopts the cold-carrying agent which can not be frozen at a lower temperature, for example, the cold-carrying agent can be glycol, the cold-carrying agent is cooled by a natural cold source after passing through the air cooler 8, the temperature is reduced, then the heat exchange between the low-temperature cold-carrying agent and the refrigerant coming out of the condenser 2 is realized in the subcooler 3, and the refrigerant is cooled to be subcooled.
When the external environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged from the condenser 2 needs to be improved, the control valve is adjusted, so that the refrigerant discharged from the compressor sequentially passes through the condenser 2 and the subcooler 3, the refrigerant enters the subcooler 3 after heat exchange with indoor air through the condenser 2, heat exchange is carried out between the refrigerant and the secondary refrigerant in the subcooler 3, the temperature of the refrigerant is reduced again, and the refrigerant with unit mass generates better refrigeration effect; when the external environment temperature reaches the utilizable temperature but does not need to increase the supercooling degree of the refrigerant discharged from the condenser 2, and when the external environment temperature does not reach the utilizable temperature (the outdoor temperature is higher than the preset temperature value in the system), the refrigerant flowing out of the condenser 2 bypasses the subcooler 3 to flow in the refrigerant refrigeration system, namely, the refrigerant flowing out of the condenser 2 does not pass through the condenser 3, and the cooling system does not work.
A refrigeration method for refrigerating by a refrigerator refrigerating system comprises the following steps: calculating the temperature difference value Delta T of the refrigerants at the inlet side and the outlet side of the condenser 21(ii) a Judging the temperature difference value Delta T1And the preset supercooling degree set value T in the systemIs provided withThe relationship of (1): if the temperature difference value is Delta T1Less than the preset supercooling degree set value T in the systemIs provided withThe control valve is controlled to enable the refrigerant flowing out of the condenser 2 to flow to the subcooler 3, the secondary refrigerant in the secondary cooling system is controlled to circularly flow, namely the third valve 14 is controlled to be opened, the fourth valve 15 is controlled to be closed, the first valve 10 is controlled to be opened, the circulating pump 7 is controlled to be started, the fan 9 is controlled to be started, the refrigerant discharged from the compressor sequentially passes through the condenser 2 and the subcooler 3, the refrigerant enters the subcooler 3 after being subjected to heat exchange with indoor air through the condenser 2, heat exchange is carried out between the refrigerant and the secondary refrigerant in the subcooler 3, the temperature of the refrigerant is reduced again, and the refrigerant of unit mass generates a better refrigerating effect; if the temperature difference value is Delta T1Is not less than the supercooling degree set value T preset in the systemIs provided withAnd controlling the control valve to enable the refrigerant flowing out of the condenser 2 to bypass the subcooler 3 to circularly flow in the refrigerant refrigerating system, namely controlling the third valve 14 to be closed and the fourth valve 15 to be opened, controlling the first valve 10 to be closed, stopping the circulating pump 7 and stopping the fan 9.
For calculating the temperature difference DeltaT between the refrigerant at the inlet side and the refrigerant at the outlet side of the condenser 21The method comprises the following steps: detecting the temperature T at the outlet side of the condenser 21(by providing a temperature sensor on the outlet side of the condenser 2 to detect the temperature on the outlet side of the condenser 2), detecting the pressure P on the inlet side of the condenser 2, and calculating the corresponding saturation temperature T at that pressure from the pressure P2Then, the value of temperature difference Δ T1＝|T1-T2|。
As an alternative embodiment, the refrigeration method further comprisesThe following contents: calculating the temperature difference value Delta T of the refrigerants at the inlet side and the outlet side of the subcooler 32(ii) a When temperature difference value delta T1Less than the preset supercooling degree set value T in the systemIs provided withJudging the temperature difference value Delta T1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler 3; wherein, Delta T2＝|T3-T4|，T3Is the temperature value T at the refrigerant outlet side of the subcooler 34Temperature sensors are arranged on the inlet side and the outlet side of the subcooler 3 for detecting the temperature values of the inlet side and the outlet side of the subcooler 3.
With respect to determining the temperature difference value DeltaT1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler 3, as specified below: when Δ T1+△T2>TIs provided withControlling and reducing the frequency of a fan 9 on the cold carrying system; when Δ T1+△T2≤TIs provided withAnd controlling to increase the frequency of the fan 9. The control device can judge the Delta T in real time1+△T2And the preset supercooling degree set value T in the systemIs provided withThe relationship (2) can also be detected once every set period; when Δ T1+△T2>TIs provided withThe frequency of the fan 9 on the cooling system is controlled to be reduced, and as for the amount of reduction of the frequency of the fan 9 each time, without specific limitation, a minimum fan frequency value may be set in the system, and when the frequency of the fan 9 is reduced to this value, even if Δ T1+△T2>TIs provided withThe frequency of the fan 9 is also no longer reduced, although the minimum fan frequency value may be zero. When Δ T1+△T2≤TIs provided withThe control increases the frequency of the fan 9, and as for the amount of increase in the frequency of the fan 9 each time, there is no particular limitation, even if Δ T when the frequency of the fan 9 has reached the rated frequency1+△T2≤TIs provided withThe frequency of the fan 9 is not increased.
As an alternative embodiment, the temperature difference value DeltaT is determined1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler 3, further comprising the following: when Δ T1+△T2>TIs provided withControlling to reduce the flow of the secondary refrigerant flowing to the subcooler 3; when Δ T1+△T2≤TIs provided withAnd controls to increase the flow rate of the coolant flowing to the subcooler 3. The refrigeration carrier system typically includes an accumulator, not shown in fig. 2, that is capable of regulating the flow of coolant to the subcooler 3 by varying the flow of coolant through the refrigeration carrier system. When Δ T1+△T2>TIs provided withAnd controlling to reduce the flow rate of the secondary refrigerant flowing to the subcooler 3, and setting a secondary refrigerant minimum flow rate value in the system, even if delta T when the flow rate of the secondary refrigerant flowing to the subcooler 3 is equal to the secondary refrigerant minimum flow rate value1+△T2>TIs provided withThe flow rate of the coolant flowing to the subcooler 3 does not change; when Δ T1+△T2≤TIs provided withControlling and increasing the flux of the secondary refrigerant flowing to the subcooler 3, setting the maximum flux value of the secondary refrigerant in the system, and when the flux of the secondary refrigerant flowing to the subcooler 3 is equal to the maximum flux value of the secondary refrigerant, even if delta T1+△T2≤TIs provided withThe flow rate of the coolant flowing to the subcooler 3 is not changed.
When the flow rate of the coolant is changed, the first valve 10 operates as follows: when Δ T1+△T2>TIs provided withThe opening of the first valve 10 is controlled to be decreased, and as for the decrease of the opening of the first valve 10 per time, without any particular limitation, a minimum opening may be set in the system, even if Δ T is reached when the minimum opening of the first valve 10 is reached1+△T2>TIs provided withThe opening of the first valve 10 is not reduced any more. When Δ T1+△T2≤TIs provided withThe opening degree of the first valve 10 is controlled to increase, and as for the increase of the opening degree value of the first valve 10 each time, no specific limitation is made, and the opening degree of the first valve 10 cannot be increased again until the first valve 10 reaches the maximum opening degree value.
When the flow rate of the coolant changes, the circulation pump 7 operates as follows: when Δ T1+△T2>TIs provided withThe power of the circulation pump 7 is controlled to be reduced, and as for the amount of the power of the circulation pump 7 to be reduced each time, there is no particular limitation, and a minimum circulation pump frequency value may be set in the system, and when the power of the circulation pump 7 is reduced to this value, even if Δ T1+△T2>TIs provided withThe power of the circulation pump 7 is no longer reduced. When Δ T1+△T2≤TIs provided withThe power of the circulation pump 7 is controlled to be increased, and as for the amount of power increase of the circulation pump 7 at a time, there is no particular limitation, even if Δ T when the power of the circulation pump 7 has reached the rated power1+△T2≤TIs provided withThe power of the circulation pump 7 is not increased.
As an alternative embodiment, the temperature difference value DeltaT is determined1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler 3, including the following: when Δ T1+△T2>TIs provided withControlling and reducing the flow rate of the refrigerant flowing to the subcooler 3; when Δ T1+△T2≤TIs provided withAnd the flow rate of the refrigerant flowing to the subcooler 3 is controlled to be increased. When Δ T1+△T2>TIs provided withControlling and reducing the flow rate of the refrigerant flowing to the subcooler 3, setting a minimum flow rate value of the refrigerant in the system, and when the flow rate of the refrigerant flowing to the subcooler 3 is equal to the minimum flow rate value of the refrigerant, even if delta T1+△T2>TIs provided withThe flow rate of the refrigerant flowing to the subcooler 3 does not change; when Δ T1+△T2≤TIs provided withControlling and increasing the flow rate of the refrigerant flowing to the subcooler 3, setting the maximum flow rate value of the refrigerant in the system, and when the flow rate of the refrigerant flowing to the subcooler 3 is equal to the maximum flow rate value of the refrigerant, even if delta T1+△T2≤TIs provided withThe flow rate of the refrigerant flowing into the subcooler 3 does not change.
When the flow rate of the refrigerant changes, the third valve 14 operates as follows: when Δ T1+△T2>TIs provided withThe opening of the third valve 14 is controlled to decrease, and the decrease of the opening of the third valve 14 is not specifically limited, but a minimum opening may be set in the system when the third valve 14 decreases each timeWhen valve 14 reaches a minimum opening value, i.e. Δ T1+△T2>TIs provided withThe opening of the third valve 14 is not reduced any more. When Δ T1+△T2≤TIs provided withThe opening degree of the third valve 14 is controlled to increase, and as for the increase of the opening degree value of the third valve 14 each time, no specific limitation is made, and the opening degree of the third valve 14 cannot be increased again until the third valve 14 reaches the maximum opening degree value.
As an alternative embodiment, the outdoor air temperature is detected, and when the outdoor air temperature is not greater than the preset temperature value, the calculation of the temperature difference value Δ T of the refrigerant at the inlet side and the outlet side of the condenser 2 is performed1. That is, when the external environment temperature reaches the available temperature, the calculation of the temperature difference value Δ T of the refrigerant at the inlet side and the outlet side of the condenser 2 is performed1Judging the temperature difference value Delta T1And the preset supercooling degree set value T in the systemIs provided withOnly to calculate the temperature difference value DeltaT of the refrigerant at the inlet side and the outlet side of the subcooler 32Judging the temperature difference value Delta T1+△T2And the preset supercooling degree set value T in the systemIs provided withThe relationship (2) of (c).
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (16)
1. A refrigerating system of a refrigerator is characterized by comprising a refrigerant refrigerating system and a cold carrying system, wherein,
the cold carrying system comprises a subcooler (3) and an outdoor air cooler (8), wherein the subcooler (3) is connected with the refrigerant refrigerating system, and a control valve of the refrigerator refrigerating system is adjusted to enable a refrigerant discharged from a refrigerant refrigerating system compressor to be condensed only through a condenser (2) of the refrigerant refrigerating system or condensed only through the subcooler (3) or condensed sequentially through the condenser (2) and the subcooler (3).
2. The refrigerator refrigeration system of claim 1, wherein a first liquid outlet pipe and a second liquid outlet pipe are connected in parallel at an outlet side of a condenser (2) of the refrigerant refrigeration system, the subcooler (3) is arranged on the first liquid outlet pipe, the control valves are arranged on the first liquid outlet pipe and the second liquid outlet pipe, and the control valve on the first liquid outlet pipe is positioned at an inlet side of the subcooler (3).
3. A refrigerator refrigeration system according to claim 1, characterized in that the air cooler (8) is provided with a temperature sensor for detecting the outside temperature, the temperature sensor is connected with a control device of the refrigerator refrigeration system, when the outside environment temperature reaches the available temperature and the supercooling degree of the refrigerant discharged from the condenser (2) needs to be increased, the control device can control the control valve so that the refrigerant discharged from the compressor can sequentially pass through the condenser (2) and the subcooler (3).
4. A refrigerator refrigeration system as claimed in any one of claims 1 to 3, characterised in that the refrigerant refrigeration system comprises a first compressor (1) and a second compressor (6), the first compressor (1) and the second compressor (6) being connected in series.
5. A refrigerator refrigeration system as claimed in claim 4, characterized in that said first compressor (1) is a high-pressure stage compressor, said second compressor (6) is a low-pressure stage compressor, the outlet side of said second compressor (6) being connected to said first compressor (1) by means of a pipe.
6. The refrigerator refrigeration system of claim 5, wherein the refrigerant refrigeration system comprises a third connecting pipeline and a fourth connecting pipeline connected in parallel with the third connecting pipeline, the first compressor (1) is arranged on the third connecting pipeline, valve bodies are arranged on the third connecting pipeline and the fourth connecting pipeline, and the valve body on the third connecting pipeline is positioned on the liquid inlet side of the first compressor (1).
7. A refrigerator refrigeration system as claimed in claim 5, further comprising a gas make-up circuit arrangement for making up gas for the first compressor (1).
8. The freezer refrigeration system of claim 7, characterized in that, the freezer refrigeration system still includes vapour and liquid separator (4), vapour and liquid separator (4) with subcooler (3) are connected, the gas outlet of vapour and liquid separator (4) through the backflow pipeline with first compressor (1) with pipeline between second compressor (6) is connected, set up the valve body on the backflow pipeline, the liquid outlet of vapour and liquid separator (4) with freezer refrigeration system's evaporimeter (5) are connected, just vapour and liquid separator (4) with set up throttling arrangement between evaporimeter (5).
9. Refrigerator refrigeration system according to claim 8, characterized in that the inlet side of the gas-liquid separator (4) is provided with a throttling device.
10. A refrigerator comprising the refrigerator refrigeration system of any of claims 1-9.
11. A refrigeration method for refrigerating with the refrigerator refrigeration system of any of claims 1-9, comprising:
calculating the temperature difference value delta T of the refrigerants on the inlet side and the outlet side of the condenser (2)1；
Judging the temperature difference value Delta T1And the preset supercooling degree set value T in the systemIs provided withThe relationship of (1): if the temperature difference value is Delta T1Less than the preset supercooling degree set value T in the systemIs provided withThe control valve is controlled to enable the refrigerant flowing out of the condenser (2) to flow to the subcooler (3) and control the secondary refrigerant in the secondary cooling systemCirculating flow, if the temperature difference value is delta T1Is not less than the supercooling degree set value T preset in the systemIs provided withAnd the control valve is controlled to enable the refrigerant flowing out of the condenser (2) to bypass the subcooler (3) and to circularly flow in the refrigerant refrigeration system.
12. A refrigerating method as claimed in claim 11, characterized by calculating the temperature difference Δ T between the refrigerant at the inlet side and at the outlet side of the condenser (2)1The method comprises the following steps:
detecting the temperature T of the outlet side of the condenser (2)1Detecting the pressure P at the inlet side of the condenser (2), calculating the corresponding saturation temperature T at this pressure according to said pressure P2Then, the value of temperature difference Δ T1＝|T1-T2|。
13. A refrigeration method according to claim 12, further comprising:
calculating the temperature difference value delta T of the refrigerants at the inlet side and the outlet side of the subcooler (3)2；
When temperature difference value delta T1Less than the preset supercooling degree set value T in the systemIs provided withJudging the temperature difference value Delta T1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler (3);
wherein, Delta T2＝|T3-T4|，T3Is the temperature value T at the refrigerant outlet side of the subcooler (3)4Is the temperature value of the refrigerant inlet side of the subcooler (3).
14. Refrigeration method according to claim 13, characterized in that the temperature difference Δ T is determined1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler (3), comprising the following: when Δ T1+△T2>TIs provided withControlling and reducing the frequency of a fan (9) on the cold-carrying system; when Δ T1+△T2≤TIs provided withAnd controlling to increase the frequency of the fan (9).
15. Refrigeration method according to claim 13, characterized in that the temperature difference Δ T is determined1+△T2And the preset supercooling degree set value T in the systemIs provided withTo control the heat exchanger efficiency of the subcooler (3), comprising the following: when Δ T1+△T2>TIs provided withControlling and reducing the flow of the secondary refrigerant flowing to the subcooler (3); when Δ T1+△T2≤TIs provided withAnd controlling to increase the flow rate of the secondary refrigerant flowing to the subcooler (3).
16. A refrigerating method as claimed in claim 11, characterized in that the outdoor air temperature is detected, and when the outdoor air temperature is not greater than a preset temperature value, the calculation of the temperature difference Δ T between the refrigerant at the inlet side and at the outlet side of the condenser (2) is performed1。
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| CN114279097B (en) | 2023-01-24 |
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