阅读说明：本技术 一种用于空调热泵机组的制冷剂自动补给的控制方法 (Control method for automatic supply of refrigerant for air-conditioning heat pump unit ) 是由 范立群 于 2020-06-24 设计创作，主要内容包括：本发明涉及空调技术领域,尤其涉及一种用于空调热泵机组的制冷剂自动补给的控制方法；结合机组运行模式来驱使控制板控制电子膨胀阀的开度、再通过机组压力传感单元及各温度传感单元反馈的数据控制开关单元开启和关闭,来实现既能及时地自动判定是否缺少制冷剂避免延误造成资源浪费,又能根据机组的精准需求量来自动补给制冷剂量使机组可发挥最佳效果。(The invention relates to the technical field of air conditioners, in particular to a control method for automatically supplying a refrigerant for an air conditioner heat pump unit; the control panel is driven to control the opening degree of the electronic expansion valve by combining the unit operation mode, and then the opening and closing of the switch unit are controlled by data fed back by the unit pressure sensing unit and the temperature sensing units, so that whether the refrigerant is lacked or not can be automatically judged in time, the delay is avoided, the resource waste is avoided, and the amount of the refrigerant can be automatically supplied according to the accurate demand of the unit, so that the unit can exert the optimal effect.)

1. A control method for automatic supply of refrigerant of an air-conditioning heat pump unit is characterized by comprising the following steps: the unit runs for 30min after being started, the main electronic expansion valve (11) and the auxiliary electronic expansion valve (10) are set to be in fixed opening degrees according to the unit running mode and the environment temperature detected by the environment sensing unit (13), and then the unit drives the control unit (1) to control the switch unit (4) to be opened and closed according to the numerical values fed back by the sensing units, so that the purpose of automatic refrigerant supply is achieved.

2. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 1, wherein: the switching unit (4) for guiding the liquid of the bottled refrigerant (2) connected in the refrigerant bottle to the gas-liquid separator (A) is provided with an on-off electromagnetic valve and a connecting copper pipe, the connecting copper pipe is used for connecting the unit, the refrigerant bottle and the on-off electromagnetic valve, and the on-off electromagnetic valve is arranged between the refrigerant bottle connected in the unit and the gas-liquid separator (A).

3. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 1, wherein: when in cooling mode, if (Δ P)_C-a defined value_C<0) Or (Δ T)_C1-a defined value_C1>0) Or (Δ T)_C2-a defined value_C2>0) Or (Δ T)_C3-a defined value_C3<0) Then introducing bottled refrigerant (2) in a refrigerant bottle connected to the unit into a gas-liquid separator (A) of the unit to participate in circulating heat exchange; the refrigerants enter a gas-liquid separator (A) of the unit and participate in the circulating heat exchange process, if (delta P)_C-a defined value_CNot less than 0) and (Δ T)_C1-a defined value_C1Not more than 0) and (Delta T)_C2-a defined value_C2Not more than 0) and (Delta T)_C3-a defined value_C3Not less than 0) and lasting at least 10 seconds, then the refrigerant leading to the gas-liquid separator (A) is cut off, namely the bottled refrigerant (2) in the refrigerant bottle connected with the unit is stopped from entering the system pipeline to participate in heat exchange so as to ensure that the refrigerant of the system is not excessive, otherwise the bottled refrigerant (2) in the refrigerant bottle connected with the unit is continuously led into the system through the gas-liquid separator (A) to participate in heat exchange so as to improve the heat exchange effect.

4. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 3, wherein: the described Δ P_CIs the pressure P sensed by the measured pressure sensing unit (6) in the refrigeration mode_CWith a pressure set point P_C' difference of, said set value P_C' is the minimum value of the return air pressure measured by the normal unit in the current environment temperature interval in the refrigeration mode.

5. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 3, wherein: the specified value is the minimum deviation of actually measured return air pressure of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C1Is the temperature T sensed by the actually measured return air sensing unit (7) in the refrigeration mode_C1With a set temperature value T_C1' the difference; the T is_C1The maximum value of actually measured return air temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the maximum deviation of actually measured return air temperature of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C2Is the temperature T sensed by the actually measured exhaust sensing unit (8) in the refrigeration mode_C2With a set temperature value T_C2' the difference; the T is_C2The maximum value of actually measured exhaust temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the maximum deviation of actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C3For actually measuring the temperature T sensed by the condensation sensing unit (12) in the refrigeration mode_C3With a set temperature value T_C3' the difference; the T is_C3The minimum value of actually measured condensation temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the minimum deviation of the actually measured condensation temperature of the normal unit in the current environment temperature interval in the refrigeration mode.

6. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 1, wherein: when in heating mode, if (Δ P)_h-a defined value_h<0) Or (Δ T)_h1-a defined value_h1>0) Or (Δ T)_h2-a defined value_h2>0) Or (Δ T)_h3-a defined value_h3<0) Then introducing the refrigerant liquid in a refrigerant bottle (2) connected with the unit into a gas-liquid separator (A) of the unit to participate in cycle heat exchange; refrigerant liquid in a refrigerant bottle (2) connected with the unit enters a gas-liquid separator (A) of the unit and participates in the circulating heat exchange process if (delta P)_h-a defined value_hNot less than 0) and (Δ T)_h1-a defined value_h1Not more than 0) and (Delta T)_h2-a defined value_h2Not more than 0) and (Delta T)_h3-a defined value_h3≧ 0) and for at least 10 seconds, then breakAnd opening the refrigerant introduced to the gas-liquid separator (A), namely stopping the refrigerant liquid in the refrigerant bottle (2) connected to the unit from entering a system pipeline to participate in heat exchange so as to ensure that the refrigerant of the system is not excessive, and otherwise, continuously enabling the refrigerant liquid in the refrigerant bottle (2) connected to the unit to enter the system through the gas-liquid separator (A) to participate in heat exchange so as to improve the heat exchange effect.

7. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 6, wherein: the described Δ P_hFor measuring the pressure P sensed by the pressure sensing unit (6) in the heating mode_hWith a pressure set point P_h' the difference; the set value P_h' is the minimum value of the return air pressure measured in the current environment temperature interval in the heating mode of the normal unit.

8. The method for controlling automatic replenishment of refrigerant for an air conditioning heat pump unit according to claim 6, wherein: the specified value is the minimum deviation of actually measured return air pressure of the normal unit in the current environment temperature interval in the heating mode; the Δ T_h1For actually measuring the temperature T sensed by the return air sensing unit (7) in the heating mode_h1With a set temperature value T_h1' the difference; the T is_h1The maximum value of actually measured return air temperature of a normal unit in a current environment temperature interval in a heating mode; the specified value is the maximum deviation of the actually measured return air temperature of the normal unit in the current environment temperature interval in the heating mode; the Δ T_h2For actually measuring the temperature T sensed by the exhaust sensing unit (8) in the heating mode_h2With a set temperature value T_h2' the difference; the T is_h2The maximum value of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the heating mode is' shown in the specification; the specified value is the maximum deviation of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the heating mode; the Δ T_h3The temperature Th3 sensed by the middle sensing unit (9) is actually measured and the temperature set value T is measured under the heating mode_h3' the difference; the T is_h3' heating for normal unitActually measuring the minimum value of the condensation temperature in the current environment temperature interval in the mode; the specified value is the minimum deviation of the actually measured condensation temperature of the normal unit in the current environment temperature interval in the heating mode.

Technical Field

The invention relates to the technical field of air conditioners, in particular to a control method for automatic supply of a refrigerant of an air conditioner heat pump unit.

Background

As is well known, in the process of long-term use of an air-conditioning heat pump unit after installation, a refrigerant can continuously escape from each sealing interface of a unit copper pipe little by little, and along with the expansion and contraction of heat and the contraction of cold of an object or the gradual aging of a sealing ring, the slight escape cannot be avoided, and along with the lapse of time, the accumulated escape amount of the refrigerant reaches a certain degree, so that the system is easy to lack the refrigerant, and the refrigerating capacity, the heating capacity and the energy efficiency of the unit operation are poor, thereby affecting the use effect. In order to solve the problem, generally, when a user perceives that the unit effect is obviously poor, the user feeds back to after-sales personnel, and then the after-sales personnel go to the site to supplement the refrigerant to the unit. However, the scheme has the following defects that 1, when a user perceives that the unit effect is obviously poor, a large amount of refrigerants in the unit are accumulated and escaped, the unit runs for a period of time under the condition of lacking the refrigerants in the escaping process, the unit effect in the period of time is poor, the due effect of the unit is not exerted at all, and the resource waste is caused; 2. after the after-sales staff goes to the site and supplements the refrigerant, the effect of the unit is improved only by supplementing some refrigerant roughly by combining the system pressure value and experience, but strictly speaking, the quantity of the supplemented refrigerant is not the accurate demand quantity of the unit, so the unit cannot exert the optimal effect.

Disclosure of Invention

The invention aims to solve the technical problems and provides a control method for automatically supplying refrigerant for an air-conditioning heat pump unit, which combines the unit operation mode to drive a control panel to control the opening of an electronic expansion valve and controls the opening and closing of a switch unit through data fed back by a unit pressure sensing unit and each temperature sensing unit, thereby realizing the purposes of automatically judging whether the refrigerant is lacked in time to avoid delaying to cause resource waste and automatically supplying the refrigerant amount according to the accurate demand of the unit so that the unit can exert the best effect.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the unit runs for 30min after being started, the main electronic expansion valve and the auxiliary electronic expansion valve are set to be in fixed opening degrees according to the unit running mode and the environment temperature detected by the environment sensing units, and then the unit drives the control unit to control the switch unit to be opened and closed according to the numerical values fed back by the sensing units, so that the purpose of automatically supplying the refrigerant is achieved.

Further optimizing the technical scheme, the switch unit facilities for guiding the bottled refrigerant liquid connected in the refrigerant bottle to the gas-liquid separator are an on-off electromagnetic valve and a connecting copper pipe, the connecting copper pipe is used for connecting the unit, the refrigerant bottle and the on-off electromagnetic valve, and the on-off electromagnetic valve is arranged between the refrigerant bottle connected with the unit and the gas-liquid separator.

Further excellenceAccording to the technical scheme, in the refrigeration mode, if (delta P)_C-a defined value_C<0) Or (Δ T)_C1-a defined value_C1>0) Or (Δ T)_C2-a defined value_C2>0) Or (Δ T)_C3-a defined value_C3<0) Then introducing bottled refrigerant in a refrigerant bottle connected to the unit into a gas-liquid separator of the unit to participate in circulating heat exchange; the refrigerants enter a gas-liquid separator of the unit and participate in the circulating heat exchange process, if (delta P)_C-a defined value_CNot less than 0) and (Δ T)_C1-a defined value_C1Not more than 0) and (Delta T)_C2-a defined value_C2Not more than 0) and (Delta T)_C3-a defined value_C3Not less than 0) and lasting at least 10 seconds, the refrigerant introduced to the gas-liquid separator (A) is cut off, namely, the bottled refrigerant in the refrigerant bottle connected to the unit is stopped from entering a system pipeline to participate in heat exchange so as to ensure that the refrigerant of the system is not excessive, otherwise, the bottled refrigerant in the refrigerant bottle connected to the unit is continuously led into the system through the gas-liquid separator to participate in heat exchange so as to improve the heat exchange effect.

Further optimizing the technical scheme, the delta P_CIs the pressure P sensed by the actually measured pressure sensing unit in the refrigeration mode_CWith a pressure set point P_C' difference of, said set value P_C' is the minimum value of the return air pressure measured by the normal unit in the current environment temperature interval in the refrigeration mode.

Further optimizing the technical scheme, wherein the specified value is the minimum deviation of actually measured return air pressure of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C1For measuring the temperature T sensed by the return air sensing unit under the refrigeration mode_C1With a set temperature value T_C1' the difference; the T is_C1The maximum value of actually measured return air temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the maximum deviation of actually measured return air temperature of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C2For actually measuring the temperature T sensed by the exhaust sensing unit in the refrigeration mode_C2With a set temperature value T_C2' the difference; the above-mentionedT_C2The maximum value of actually measured exhaust temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the maximum deviation of actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode; the Δ T_C3For actually measuring the temperature T sensed by the condensation sensing unit in the refrigeration mode_C3With a set temperature value T_C3' the difference; the T is_C3The minimum value of actually measured condensation temperature of a normal unit in a current environment temperature interval in a refrigeration mode is' obtained; the specified value is the minimum deviation of the actually measured condensation temperature of the normal unit in the current environment temperature interval in the refrigeration mode.

Further optimizing the technical scheme that in the heating mode, if (delta P)_h-a defined value_h<0) Or (Δ T)_h1-a defined value_h1>0) Or (Δ T)_h2-a defined value_h2>0) Or (Δ T)_h3-a defined value_h3<0) Then introducing the refrigerant liquid in the refrigerant bottle connected with the unit into a gas-liquid separator of the unit to participate in circulating heat exchange; the refrigerant liquid in the refrigerant bottle connected with the unit enters the gas-liquid separator of the unit and participates in the circulating heat exchange process if (delta P)_h-a defined value_hNot less than 0) and (Δ T)_h1-a defined value_h1Not more than 0) and (Delta T)_h2-a defined value_h2Not more than 0) and (Delta T)_h3-a defined value_h3Not less than 0) and lasting at least 10 seconds, the refrigerant introduced to the gas-liquid separator is cut off, namely, the refrigerant liquid in the refrigerant bottle connected to the unit is stopped from entering the system pipeline to participate in heat exchange so as to ensure that the refrigerant of the system is not excessive, otherwise, the refrigerant liquid in the refrigerant bottle connected to the unit is continuously led into the system through the gas-liquid separator to participate in heat exchange so as to improve the heat exchange effect.

Further optimizing the technical scheme, the delta P_hFor measuring the pressure P sensed by the pressure sensing unit under the heating mode_hWith a pressure set point P_h' the difference; the set value P_h' is the minimum value of the return air pressure measured in the current environment temperature interval in the heating mode of the normal unit.

Further optimizing the technical scheme, wherein the specified value is the minimum deviation of the actually measured return air pressure of the normal unit in the heating mode in the current environment temperature interval; the Δ T_h1For actually measuring the temperature T sensed by the return air sensing unit in the heating mode_h1With a set temperature value T_h1' the difference; the T is_h1The maximum value of actually measured return air temperature of a normal unit in a current environment temperature interval in a heating mode; the specified value is the maximum deviation of the actually measured return air temperature of the normal unit in the current environment temperature interval in the heating mode; the Δ T_h2For actually measuring the temperature T sensed by the exhaust sensing unit in the heating mode_h2With a set temperature value T_h2' the difference; the T is_h2The maximum value of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the heating mode is' shown in the specification; the specified value is the maximum deviation of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the heating mode; the Δ T_h3The temperature Th3 sensed by the middle sensing unit is actually measured under the heating mode and is compared with the set temperature value T_h3' the difference; the T is_h3The minimum value of actually measured condensation temperature of a normal unit in a current environment temperature interval in a heating mode; the specified value is the minimum deviation of the actually measured condensation temperature of the normal unit in the current environment temperature interval in the heating mode.

Compared with the prior art, the invention has the following advantages: because the traditional method is that when the user perceives that the unit effect is obviously poor, the user feeds back to the after-sales personnel, and then the after-sales personnel go to the site to supplement the refrigerant to the unit, the refrigerant in the unit is accumulated and escaped a lot at the moment, the unit runs for a period under the condition of lacking the refrigerant in the escaping process, the unit effect in the period is poor, the due effect of the unit is not exerted, and the waste of resources is caused; in addition, in the conventional method, after an after-sales person goes to the site, when the refrigerant is supplemented, some refrigerants are supplemented roughly by combining the system pressure value with experience to improve the unit effect, but the supplemented refrigerants are not the accurate demand of the unit, so the unit cannot exert the optimal effect; in conclusion, the invention has the advantages that whether the refrigerating fluid is lacked or not can be automatically judged in time, the resource waste caused by time delay due to the fact that users lack the refrigerating fluid cannot recognize in time can be avoided, and the refrigerating fluid can be automatically supplied according to the accurate demand of the unit, so that the optimal operation effect of the unit can be fully exerted.

Drawings

Fig. 1 is a schematic structural diagram of a control method for automatic refrigerant replenishment of an air-conditioning heat pump unit.

In the figure: 1. a control unit; 2. bottling the refrigerant; 3. a refrigerant supply outlet; 4. a switch unit; 5. a refrigerant supply inlet; 6. a pressure sensing unit; 7. an air return sensing unit; 8. an exhaust gas sensing unit; 9. a middle sensing unit; 10. an auxiliary electronic expansion valve; 11. a main electronic expansion valve; 12. a condensation sensing unit; 13. an environment sensing unit; A. a gas-liquid separator; B. a compressor; C. a four-way valve; D. an indoor heat exchanger; E. an economizer; F. an outdoor heat exchanger.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

When the system is used, as shown in fig. 1, the system is in a circulating flow, during the cooling operation, the refrigerant gas entering the compressor B is compressed and then changed into high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas is guided by the four-way valve C to reach the outdoor heat exchanger F to be condensed and then changed into high-temperature high-pressure refrigerant liquid, the high-temperature high-pressure refrigerant liquid passes through the main circuit of the economizer E, flows out of the main circuit to the main electronic expansion valve 11 for throttling and then is changed into low-temperature low-pressure refrigerant liquid, the high-temperature high-pressure refrigerant liquid enters the indoor heat exchanger D to absorb the heat of indoor air and then is changed into low-pressure refrigerant gas, and if the unit does not enter the refrigerant_c1-provision ofValue of_c1Not more than 0) and (Δ Tc 2-specified value C2 not more than 0) and (Δ Tc 3-specified value C3 not less than 0) for at least 10 seconds, the switching unit 4 is closed to terminate the automatic supply of the refrigerant, and the refrigerant gas coming out of the internal machine enters the gas-liquid separator a through the four-way valve C and then directly enters the compressor B for compression; if the unit enters the refrigerant detection program and satisfies (Delta Pc-specified value c)<0) Or (Δ Tc 1-specified value c 1)>0) Or (Δ Tc 2-specified value c 2)>0) Or (Δ Tc 3-specified value c 3)<0) The unit driving control unit 1 controls the switch unit 4 to be opened, the refrigerant is automatically supplied, bottled refrigerant 2 in a refrigerant bottle connected to the unit flows to the switch unit 4 from a refrigerant supply outlet 3, enters the gas-liquid separator A through a refrigerant supply inlet 5, is converged with refrigerant gas which flows out of the indoor heat exchanger D and enters the gas-liquid separator A through the four-way valve C, and then enters the compressor B for compression, so that a refrigeration cycle is formed;

during heating operation, refrigerant gas entering the compressor B is compressed to become high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas is guided by the four-way valve C to reach the indoor heat exchanger D to be condensed to become high-temperature high-pressure refrigerant liquid, the high-temperature high-pressure refrigerant liquid is divided into 2 paths, one path of the high-temperature high-pressure refrigerant liquid is throttled by the auxiliary electronic expansion valve 10 to become low-temperature refrigerant liquid, the low-temperature refrigerant liquid flows to the auxiliary path of the economizer E, the low-temperature refrigerant gas is flashed after the heat of the high-temperature refrigerant liquid in the main path of the economizer is absorbed in the auxiliary path of the economizer E, and the low-; the other path of high-pressure refrigerant liquid passes through a main path of the economizer E, flows out of the main path to flow to the main electronic expansion valve 11 for throttling, then is changed into low-temperature low-pressure refrigerant liquid, enters the outdoor heat exchanger F to absorb the heat of outdoor air, then is changed into low-pressure refrigerant gas, if the unit does not enter a refrigerant detection program or the unit enters the refrigerant detection program but meets (delta Ph-specified value h is more than or equal to 0) and (delta Th 1-specified value h1 is less than or equal to 0) and (delta Th 2-specified value h2 is less than or equal to 0) and (delta Th 3-specified value h3 is more than or equal to 0) for at least 10 seconds, the switch unit 4 is closed, the automatic refrigerant supply is stopped, and the refrigerant gas coming out of the outdoor heat exchanger F enters the gas-liquid separator A through the; if the unit enters a refrigerant detection program and meets (delta Ph-specified value h < 0) or (delta Th 1-specified value h1> 0) or (delta Th 2-specified value h2> 0) or (delta Th 3-specified value h3< 0), the unit driving control unit 1 controls the switch unit 4 to be opened, the automatic refrigerant supply is started, bottled refrigerant 2 in a refrigerant bottle connected with the unit flows to the switch unit 4 from a refrigerant supply outlet 3, enters the gas-liquid separator A through a refrigerant supply inlet 5, is merged with refrigerant gas which flows out of the outdoor heat exchanger F and enters the gas-liquid separator A through the four-way valve C, and then enters the compressor B for compression, so that a heating cycle is formed;

when the air conditioner is used, as shown in fig. 1, the control flow is that the switch unit 4 is connected to the control unit 1 through an electromagnetic valve connecting line, the pressure sensing unit 6 is connected to the control unit 1 through a pressure sensor connecting line, the return air sensing unit 7 is connected to the control unit 1 through a temperature sensor connecting line, the exhaust sensing unit 8 is connected to the control unit 1 through a temperature sensor connecting line, the middle sensing unit 9 is connected to the control unit 1 through a temperature sensor connecting line, the condensation sensing unit 12 is connected to the control unit 1 through a temperature sensor connecting line, the environment sensing unit 13 is connected to the control unit 1 through a temperature sensor connecting line, and the control unit 1 is connected to an outdoor unit to a power supply, so that a control.

The invention has the advantages that whether the refrigerating fluid is lacked or not can be automatically judged in time, the resource waste caused by time delay due to the fact that users lack the refrigerating fluid cannot recognize in time is avoided, and the refrigerating fluid can be automatically supplied according to the accurate demand of the unit, so that the optimal operation effect of the unit can be fully exerted; as an improvement, a bottle for supplying the refrigerant is a hydraulic steel bottle, so that the refrigerant led out from the refrigerant bottle connected with the unit to the gas-liquid separator (A) of the unit can be ensured to be in a liquid state all the time, and the mixed refrigerant is prevented from entering the unit in a non-liquid state to generate the change of component ratio so as to influence the heat transfer effect; as a further improvement, if the time (Delta Ph-specified value h is more than or equal to 0) and (Delta Th 1-specified value h1 is more than or equal to 0) and (Delta Th 2-specified value h2 is more than or equal to 0) and the time (Delta Th 3-specified value h3 is more than or equal to 0) lasts for 10 seconds, the automatic supply of the refrigerant liquid is cut off, namely the refrigerant liquid of the bottled refrigerant 2 in the refrigerant bottle connected to the unit is stopped from entering the gas-liquid separator A to participate in the circulating heat exchange so as to ensure that the liquid slugging is not formed, and the 10 seconds are the preferable data obtained by experiments, so that the operation effect of the unit is more favorably improved than.

The control mode of the invention is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the invention belongs to the common knowledge in the field, and the invention is mainly used for protecting the mechanical arrangement, so the control mode and the circuit connection are not explained in detail in the invention.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.