CN211400357U

CN211400357U - Air conditioning system

Info

Publication number: CN211400357U
Application number: CN201922144908.0U
Authority: CN
Inventors: 尚瑞; 陈志杰; 吴一梅; 荆莹
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-09-01
Anticipated expiration: 2029-12-02

Abstract

The utility model provides an air conditioning system, in the air conditioning system, an inlet of a compressor is connected with a first opening of a cooler through a second pipeline; the other end of the indoor heat exchanger is connected with one end of the first throttling expansion valve through a third pipeline; the other end of the outdoor heat exchanger is connected with one end of a second throttle expansion valve; a second opening of the cooler is connected with the other end of the first throttle expansion valve through a fourth pipeline, and a third opening of the cooler is connected with the other end of the second throttle expansion valve through a fifth pipeline; the air compensating valve is arranged on the second pipeline in an openable way; the first temperature detector is used for detecting the temperature of the fluid in the third pipeline, and the second temperature detector is used for detecting the temperature of the fluid in the fourth pipeline or the fifth pipeline. This allows the temperature to be detected by the first temperature detector and the second temperature detector, which facilitates obtaining the fluid temperature at the critical location. And then, the difference value of the detected temperature can be obtained, so that whether the gulp valve is abnormal or not can be judged according to the difference value.

Description

Air conditioning system

Technical Field

The utility model relates to an air conditioning technology field particularly, relates to an air conditioning system.

Background

With the popularization and application of coal-to-electricity projects and the continuous growth of heating demand markets, an ultralow-temperature air source heat pump heating product adopting middle air supply and enthalpy increase becomes one of main products in the air conditioning market, the system flow is more complex, and special air supply and enthalpy increase loops and air supply and enthalpy increase electromagnetic valves are matched to realize switching control of the system flow. In the actual operation of the unit, a gas supplementing and enthalpy increasing mode (a gas supplementing valve is opened) and a common mode (a gas supplementing valve is closed) exist, and the control of a compressor, a throttling mechanism, oil return defrosting and the like of the unit is completely different in the two modes. Therefore, if the gulp valve fails to be normally opened or closed according to the control requirement due to the self abnormality in the corresponding mode, the operation of the whole system is abnormal.

In the heating use process of an ultralow-temperature air source heat pump system or a similar air conditioning system, the air supply enthalpy increasing mode and the common mode are switched and used most frequently, the opening degree of a first-stage throttling mechanism of a unit is reduced due to the fact that an air supply valve cannot be normally opened in the air supply enthalpy increasing mode, the superheat degree increasing capacity of the throttling mechanism of the system is insufficient due to failure, and the excessive air supply liquid carrying capacity of the unit is caused if the air supply valve cannot be normally closed in the common mode. The two conditions can not immediately cause the unit to generate the protection of exhaust, high pressure, overcurrent and overload and the like, only show that the unit has poor heating performance, lacks refrigerant and is not easy to discover during field maintenance, and the compressor can be worn with liquid and bring fatal damage to the unit if the unit runs for a long time without discovering in time. Therefore, whether the air supply valve is abnormal or not is judged in time, and the method is very important for the operation of the air conditioning system.

However, the currently disclosed technology focuses on the optimization of the amount of air supply control in the air supply enthalpy increasing mode (air supply valve opening) so as to achieve the system performance and avoid excessive air supply or air supply backflow, and research is lacked for system operation and detection judgment under the condition of abnormal air supply valve in the air supply enthalpy increasing system.

Disclosure of Invention

The utility model provides an air conditioning system to judge whether the gulp valve among the air conditioning system is unusual, guarantee air conditioning system reliable operation.

In order to achieve the above object, the present invention provides an air conditioning system, comprising a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a cooler, a first throttle expansion valve, a second throttle expansion valve, an air compensating valve, a first temperature detector and a second temperature detector, wherein an outlet of the compressor is connected to a first valve port of the four-way valve through a first pipeline, and an inlet of the compressor is connected to a first opening of the cooler through a second pipeline; one end of the indoor heat exchanger is connected with a second valve port of the four-way valve, and the other end of the indoor heat exchanger is connected with one end of the first throttling expansion valve through a third pipeline; one end of the outdoor heat exchanger is connected with a third valve port of the four-way valve, and the other end of the outdoor heat exchanger is connected with one end of the second throttle expansion valve; the second opening of the cooler is connected with the other end of the first throttle expansion valve through a fourth pipeline, and the third opening of the cooler is connected with the other end of the second throttle expansion valve through a fifth pipeline; the air compensating valve is arranged on the second pipeline in an openable and closable manner so as to control the on-off of the second pipeline; the first temperature detector is disposed on the third pipeline to detect a temperature of the fluid in the third pipeline, and the second temperature detector is configured to detect a temperature of the fluid in the fourth pipeline or the fifth pipeline.

Further, the air conditioning system further includes: and the first temperature detector and the second temperature detector are electrically connected with the control module so as to transmit the detection result of the first temperature detector and the detection result of the second temperature detector to the control module for processing.

Further, the air conditioning system further includes: and the alarm module is electrically connected with the control module and is used for sending alarm information.

Further, the air conditioning system further includes: a first pressure detector disposed on the first line to detect a pressure of fluid within the first line.

Further, the air conditioning system further includes: a second pressure detector for detecting a pressure of the fluid within the fourth or fifth line.

Further, the air conditioning system further includes: and the first temperature detector, the second temperature detector, the first pressure detector and the second pressure detector are electrically connected with the control module so as to respectively transmit the detection results of the first temperature detector, the second temperature detector, the first pressure detector and the second pressure detector to the control module for processing.

Further, the cooler is a flash evaporator or an economizer.

Further, the air conditioning system further includes: a third temperature detector disposed on the second conduit to detect a temperature of fluid within the second conduit.

Further, the other end of the outdoor heat exchanger is connected with one end of the second throttle expansion valve through a sixth pipeline; the air conditioning system further includes: a fourth temperature detector disposed on the sixth pipeline to detect a temperature of the fluid within the sixth pipeline.

Further, the compressor is a two-stage compressor.

By applying the technical scheme of the utility model, an air conditioning system is provided, in the air conditioning system, an inlet of a compressor is connected with a first opening of a cooler through a second pipeline; the other end of the indoor heat exchanger is connected with one end of the first throttling expansion valve through a third pipeline; the other end of the outdoor heat exchanger is connected with one end of a second throttle expansion valve; a second opening of the cooler is connected with the other end of the first throttle expansion valve through a fourth pipeline, and a third opening of the cooler is connected with the other end of the second throttle expansion valve through a fifth pipeline; the air compensating valve is arranged on the second pipeline in an openable way; the first temperature detector is used for detecting the temperature of the fluid in the third pipeline, and the second temperature detector is used for detecting the temperature of the fluid in the fourth pipeline or the fifth pipeline. Therefore, the air conditioning system can detect the temperature through the first temperature detector and the second temperature detector during operation, and therefore the temperature of the fluid at a critical position can be conveniently obtained. And then, the difference value of the detected temperature can be obtained, so that whether the gulp valve is abnormal or not can be judged according to the difference value. The method is convenient to judge, so that the abnormal condition of the gulp valve can be found in time and measures can be taken.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an air conditioning system according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

11. a compressor; 12. a gas-liquid separator; 21. a four-way valve; 22. an air supply valve; 31. an indoor heat exchanger; 32. an outdoor heat exchanger; 40. a cooler; 51. a first throttle expansion valve; 52. a second throttle expansion valve; 61. a first temperature detector; 62. a second temperature detector; 63. a third temperature detector; 64. a fourth temperature detector; 71. a first pipeline; 72. a second pipeline; 73. a third pipeline; 74. a fourth pipeline; 75. a fifth pipeline; 76. a sixth pipeline; 81. a first pressure detector; 82. a second pressure detector.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in the drawings, an embodiment of the present invention provides an air conditioning system, including a compressor 11, a four-way valve 21, an indoor heat exchanger 31, an outdoor heat exchanger 32, a cooler 40, a first throttle expansion valve 51, a second throttle expansion valve 52, an air compensating valve 22, a first temperature detector 61 and a second temperature detector 62, wherein an outlet of the compressor 11 is connected to a first valve port of the four-way valve 21 through a first pipeline 71, and an inlet of the compressor 11 is connected to a first opening of the cooler 40 through a second pipeline 72; one end of the indoor heat exchanger 31 is connected to the second valve port of the four-way valve 21, and the other end of the indoor heat exchanger 31 is connected to one end of the first throttle expansion valve 51 through a third pipeline 73; one end of the outdoor heat exchanger 32 is connected to the third port of the four-way valve 21, and the other end of the outdoor heat exchanger 32 is connected to one end of the second throttle expansion valve 52; the second opening of the cooler 40 is connected to the other end of the first expansion valve 51 through a fourth pipe 74, and the third opening of the cooler 40 is connected to the other end of the second expansion valve 52 through a fifth pipe 75; the air compensating valve 22 is arranged on the second pipeline 72 in an opening and closing way to control the on-off of the second pipeline 72; the first temperature detector 61 is provided on the third line 73 to detect the temperature of the fluid in the third line 73, and the second temperature detector 62 is used to detect the temperature of the fluid in the fourth line 74 or the fifth line 75.

By applying the technical scheme of the utility model, an air conditioning system is provided, in the air conditioning system, the inlet of the compressor 11 is connected with the first opening of the cooler 40 through the second pipeline 72; the other end of the indoor heat exchanger 31 is connected to one end of the first throttle expansion valve 51 through a third pipe 73; the other end of the outdoor heat exchanger 32 is connected to one end of the second throttle expansion valve 52; the second opening of the cooler 40 is connected to the other end of the first expansion valve 51 through a fourth pipe 74, and the third opening of the cooler 40 is connected to the other end of the second expansion valve 52 through a fifth pipe 75; the air compensating valve 22 is arranged on the second pipeline 72 in an opening and closing way; the first temperature detector 61 is for detecting the temperature of the fluid in the third line 73, and the second temperature detector 62 is for detecting the temperature of the fluid in the fourth line 74 or the fifth line 75. Thus, the temperature of the air conditioning system can be detected by the first temperature detector 61 and the second temperature detector 62 during operation, which facilitates obtaining the fluid temperature at the critical position. And then, the difference value of the detected temperature can be obtained, so that whether the gulp valve is abnormal or not can be judged according to the difference value. The judgment is convenient by adopting the mode, so that the abnormal condition of the aeration valve 22 can be found in time and measures can be taken.

In this embodiment, the air conditioning system further includes: and the control module is electrically connected with the first temperature detector 61 and the second temperature detector 62 so as to transmit the detection result of the first temperature detector 61 and the detection result of the second temperature detector 62 to the control module for processing. The detection result of the first temperature detector 61 and the detection result of the second temperature detector 62 can be obtained by the control module, and the difference value is calculated, when the calculated difference value is within the preset range, the gulp valve 22 is considered to be normally operated, when the calculated difference value exceeds the preset range, the gulp valve 22 is considered to be abnormal, and at the moment, measures can be taken in time.

In this embodiment, the air conditioning system further includes: and the alarm module is electrically connected with the control module and is used for sending alarm information. Therefore, when the gulp valve 22 is detected to be abnormal, alarm information can be sent out through the alarm module, and a user can be reminded to process the abnormal gulp valve.

In this embodiment, the air conditioning system further includes: a first pressure detector 81, the first pressure detector 81 being provided on the first pipe 71 to detect the pressure of the fluid within the first pipe 71. The pressure of the fluid in the first pipeline 71 can be detected by the first pressure detector 81, so that whether the gulp valve 22 is normal can be monitored according to the fluid pressure. The pressure of the fluid in the first pipe 71 may be converted into a corresponding saturation temperature, and whether the gulp valve 22 is abnormal or not may be determined by comparing the saturation temperature with the detection result of the second temperature detector 62.

In this embodiment, the air conditioning system further includes: a second pressure detector 82, the second pressure detector 82 being for detecting the pressure of the fluid in the fourth line 74 or the fifth line 75. The temperature detected by the second pressure detector 82 may be converted into a corresponding saturation temperature, and whether the gulp valve 22 is abnormal or not may be determined by comparing the saturation temperature with the detection result of the second temperature detector 62. By adopting the arrangement, the detection means of the air conditioning system is enriched, and the reliability is improved.

Optionally, in this embodiment, the air conditioning system further includes a gas-liquid separator 12, one end of the gas-liquid separator 12 is connected to the fourth valve port of the four-way valve 21, and the other end of the gas-liquid separator 12 is connected to the inlet of the compressor 11.

In this embodiment, the air conditioning system further includes: and the control module is electrically connected with the first temperature detector 61, the second temperature detector 62, the first pressure detector 81 and the second pressure detector 82 so as to respectively transmit the detection results of the first temperature detector 61, the second temperature detector 62, the first pressure detector 81 and the second pressure detector 82 to the control module for processing. The control module can be used for conveniently processing data and automatically judging whether the gulp valve 22 is abnormal or not, so that the automation degree is improved.

Optionally, the cooler 40 is a flash evaporator or an economizer.

Optionally, the air conditioning system further comprises: a third temperature detector 63, the third temperature detector 63 being provided on the second pipe 72 to detect the temperature of the fluid in the second pipe 72. The temperature of the fluid in the second pipe 72 can be detected by the third temperature detector 63, so that the operating state of the air conditioning system can be monitored more comprehensively.

Alternatively, the other end of the outdoor heat exchanger 32 is connected to one end of the second throttle expansion valve 52 through a sixth line 76; the air conditioning system further includes: a fourth temperature detector 64, the fourth temperature detector 64 being disposed on the sixth piping 76 to detect the temperature of the fluid within the sixth piping 76. Monitoring of the air conditioning system may be further enhanced by the fourth temperature detector 64 to ensure reliable operation.

In the present embodiment, the compressor 11 is a two-stage compressor 11. The double-stage compressor is not limited to a single-shell double-cylinder compressor, and also comprises a single-shell single-cylinder quasi-two-stage compressor, two single-stage compressors connected in series and the like.

When the air conditioning system is in the heating condition, the air conditioning system can be switched into a heating air-supply enthalpy-increasing mode and a heating normal mode, wherein the air compensating valve 22 is opened when the air conditioning system is in the heating air-supply enthalpy-increasing mode, and the air compensating valve 22 is closed when the air conditioning system is in the heating normal mode. In this embodiment, the air conditioning system may be controlled by the following control method, where the control method includes: when the air conditioning system is in the heating, air-supplementing and enthalpy-increasing mode, the temperature T1 of the fluid in the third pipeline 73 is obtained, the temperature T2 of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is obtained, and if the difference between T1 and T2 is greater than or equal to Ht1, the air-supplementing valve 22 is determined to be in a normal open state.

Further, the control method further comprises: when the air conditioning system is in the heating, air-make-up and enthalpy-increasing mode, acquiring the pressure of the fluid in the first pipeline 71, converting the acquired pressure of the fluid in the first pipeline 71 into a corresponding saturation temperature T3, acquiring the pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75, converting the acquired pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 into a corresponding saturation temperature T4, and if the difference between T3 and T4 is greater than or equal to Ht2, determining that the air make-up valve 22 is in a normal open state.

Further, the control method further comprises: when the air conditioning system is in the heating, air-supplementing and enthalpy-increasing mode, the pressure of the fluid in the first pipeline 71 is obtained, the obtained pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, and if the difference between T3 and T2 is greater than or equal to Ht3, the air-supplementing valve 22 is determined to be in a normal opening state.

Wherein, when the air conditioning system is in the three judgment conditions of the heating air supply and enthalpy increase mode, any one of the three judgment conditions is satisfied, the air compensating valve 22 can be considered to be in the normal open state, thereby enriching the judgment means and improving the reliability.

Further, the control method further comprises: if the difference between T1 and T2 is smaller than Ht1, the difference between T3 and T4 is smaller than Ht2, and the difference between T3 and T2 is smaller than Ht3, the air compensating valve 22 is judged to be in an abnormal closing state; after the gulp valve 22 is judged to be in the abnormal closing state, the air conditioning system is switched to the heating common mode and alarm information is sent out. Through the arrangement, the abnormal state of the gulp valve 22 can be known in time, and measures can be taken for adjustment in time to avoid damaging the system.

In this embodiment, the control method further includes: when the air conditioning system is in the normal heating mode, the temperature T1 of the fluid in the third pipeline 73 is acquired, the temperature T2 of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is acquired, and if the difference between T1 and T2 is less than or equal to Ht4, the air make-up valve 22 is determined to be in the normal closed state.

Further, the control method further comprises: when the air conditioning system is in the normal heating mode, the pressure of the fluid in the first pipeline 71 is acquired, the acquired pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, the pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is acquired, the acquired pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is converted into the corresponding saturation temperature T4, and if the difference between T3 and T4 is less than or equal to Ht5, the air make-up valve 22 is determined to be in the normally closed state.

Further, the control method further comprises: when the air conditioning system is in the normal heating mode, the pressure of the fluid in the first pipeline 71 is acquired, the acquired pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, and if the difference between T3 and T2 is less than or equal to Ht6, the air make-up valve 22 is determined to be in the normal closed state.

Wherein, when the air conditioning system is in the common heating mode, any one of the three judgment conditions is satisfied, the air compensating valve 22 can be considered to be in the normal working state, thereby enriching the judgment means and improving the reliability.

Further, the control method further comprises: if the difference between T1 and T2 is greater than Ht4, the difference between T3 and T4 is greater than Ht5, and the difference between T3 and T2 is greater than Ht6, the air compensating valve 22 is judged to be in an abnormal opening state; after the air make-up valve 22 is determined to be in an abnormal opening state, the air conditioning system is switched to a heating air make-up enthalpy increasing mode and alarm information is sent. Through the arrangement, the abnormal state of the gulp valve 22 can be known in time, and measures can be taken for adjustment in time to avoid damaging the system.

In this embodiment, when the air conditioning system is in the refrigeration condition, the air conditioning system may be switched to a refrigeration air-supplement and enthalpy-increase mode and a refrigeration normal mode, where the air supplement valve 22 is opened when the air conditioning system is in the refrigeration air-supplement and enthalpy-increase mode, and the air supplement valve 22 is closed when the air conditioning system is in the refrigeration normal mode, and the control method further includes: under the condition that the air conditioning system is in a refrigeration, air-supplement and enthalpy-increasing mode, the temperature T1 of fluid in the third pipeline 73 is obtained, the temperature T2 of fluid in the fourth pipeline 74 or the fifth pipeline 75 is obtained, and if the difference value between T1 and T2 is larger than or equal to Ct1, the air supplement valve 22 is judged to be in a normal opening state.

Further, the control method further comprises: under the condition that the air conditioning system is in a refrigeration, air-supplement and enthalpy-increasing mode, acquiring the pressure of the fluid in the first pipeline 71, converting the acquired pressure of the fluid in the first pipeline 71 into a corresponding saturation temperature T3, acquiring the pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75, converting the acquired pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 into a corresponding saturation temperature T4, and if the difference between T3 and T4 is greater than or equal to Ct2, determining that the air supplement valve 22 is in a normal opening state.

Further, the control method further comprises: under the condition that the air conditioning system is in a refrigeration, air-supplement and enthalpy-increasing mode, the pressure of the fluid in the first pipeline 71 is obtained, the obtained pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, and if the difference value between T3 and T2 is larger than or equal to Ct3, the air supplement valve 22 is judged to be in a normal opening state.

Wherein, when the air conditioning system is in the three judgment conditions of the refrigeration, air supplement and enthalpy increase mode, any one of the three judgment conditions is satisfied, the air supplement valve 22 can be considered to be in the normal working state, the judgment means is enriched, and the reliability is improved.

Further, the control method further comprises: if the difference value between T1 and T2 is smaller than Ct1, the difference value between T3 and T4 is smaller than Ct2, and the difference value between T3 and T2 is smaller than Ct3, the air supply valve 22 is judged to be in an abnormal closing state; after the gulp valve 22 is determined to be in the abnormal closing state, the air conditioning system is switched to the normal refrigeration mode and alarm information is sent out. Through the arrangement, the abnormal state of the gulp valve 22 can be known in time, and measures can be taken for adjustment in time to avoid damaging the system.

In this embodiment, the control method further includes: and under the condition that the air conditioning system is in the normal cooling mode, acquiring the temperature T1 of the fluid in the third pipeline 73, acquiring the temperature T2 of the fluid in the fourth pipeline 74 or the fifth pipeline 75, and if the difference value between T1 and T2 is less than or equal to Ct4, judging that the air supplementing valve 22 is in a normal closing state.

Further, the control method further comprises: when the air conditioning system is in the cooling normal mode, the pressure of the fluid in the first pipeline 71 is acquired, the acquired pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, the pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is acquired, the acquired pressure of the fluid in the fourth pipeline 74 or the fifth pipeline 75 is converted into the corresponding saturation temperature T4, and if the difference between T3 and T4 is less than or equal to Ct5, the air make-up valve 22 is determined to be in the normally closed state.

Further, the control method further comprises: when the air conditioning system is in the cooling normal mode, the pressure of the fluid in the first pipeline 71 is acquired, the acquired pressure of the fluid in the first pipeline 71 is converted into the corresponding saturation temperature T3, and if the difference between T3 and T2 is less than or equal to Ct6, the gulp valve 22 is determined to be in the normal closed state.

Wherein, when the air conditioning system is in the normal refrigeration mode, any one of the three judgment conditions is satisfied, the gulp valve 22 can be considered to be in the normal working state, thereby enriching the judgment means and improving the reliability.

Further, the control method further comprises: if the difference value between T1 and T2 is greater than Ct4, the difference value between T3 and T4 is greater than Ct5, and the difference value between T3 and T2 is greater than Ct6, the air supply valve 22 is judged to be in an abnormal opening state; after determining that the air make-up valve 22 is in an abnormal opening state, the air conditioning system is switched to a refrigeration air make-up enthalpy increasing mode and alarm information is sent. Through the arrangement, the abnormal state of the gulp valve 22 can be known in time, and measures can be taken for adjustment in time to avoid damaging the system.

The above solution can solve the following problems: 1. by comparing the system temperature and pressure parameter differences of the open state and the closed state of the air replenishing valve in the double-stage compression middle air replenishing enthalpy increasing system, the state of the air replenishing valve (abnormal opening or abnormal closing of the air replenishing valve) can be detected and judged in time in the running process of the unit. 2. The specific abnormal state of the gulp valve can be detected, including abnormal opening (namely, abnormal closing) and abnormal closing (namely, abnormal opening), so that the unit is guided to control the unit to operate based on the specific abnormal state, and the operation with diseases is avoided while the basic function is ensured. 3. The multi-dimensional and multi-combination detection is provided for the detection of the state of the air supply valve, the temperature parameter detection and the pressure parameter detection can be carried out independently, the temperature and pressure combination detection can be carried out more, the air supply and enthalpy increase system can be used in various double-stage compression middle air supply systems, and the universality is high.

The above scheme can produce the following beneficial effects or characteristics: the state of the air supply valve can be monitored in real time in the running process of the unit, the unit is guided to automatically adjust and control, and the reliability of the unit in actual running is improved. 2. The method is flexible in detection means aiming at the state of the air supply valve, capable of realizing single temperature, single pressure and temperature and pressure combination, strong in universality and flexible in application to various double-stage compression middle air supply enthalpy increasing systems.

The control module in the above scheme can be understood as a data detection and comparison control unit, and is used for collecting the temperature and pressure data fed back by the detection device in real time, automatically converting the pressure data into the saturation temperature of the corresponding refrigerant, and performing comparison and judgment.

To facilitate understanding of the scheme, the scheme is further described below.

1. Heating condition

The system flow under the air-supplementing enthalpy-increasing mode under the system heating working condition is as follows: the high-temperature and high-pressure gaseous refrigerant at the outlet of the two-stage compressor enters the indoor heat exchanger through the four-way valve, releases heat and condenses into high-pressure liquid refrigerant, realizes first-stage throttling through the first throttling expansion valve into intermediate-pressure vapor-liquid two-phase refrigerant, throttles the liquid refrigerant after passing through the flash evaporator into low-temperature and low-pressure refrigerant through the second throttling expansion valve, enters the outdoor heat exchanger to absorb heat and evaporate into low-temperature and low-pressure gaseous refrigerant, and returns to the air suction port of the two-stage compressor after passing through the four-; the saturated gaseous refrigerant passing through the flash evaporator enters the air-supplying and enthalpy-increasing port of the double-stage compressor through the opened air-supplying valve.

System flow in system normal mode: compared with the air-supply enthalpy-increasing mode flow, the saturated gaseous refrigerant after the flash evaporator enters the air-supply enthalpy-increasing port of the double-stage compressor because the air-supply valve is closed. The others are identical.

The gulp valve based on above-mentioned two kinds of modes judges to detect:

in the air-supplying enthalpy-increasing mode, continuously detecting the liquid pipe temperature (namely T1) -intermediate temperature (namely T2) of the indoor heat exchanger to be more than or equal to Ht1 ℃ for a plurality of minutes, or detecting the exhaust pressure corresponding to the saturation temperature (namely T3) -intermediate pressure corresponding to the saturation temperature (namely T4) to be more than or equal to Ht2 ℃, or detecting the exhaust pressure corresponding to the saturation temperature-intermediate temperature to be more than or equal to Ht3 ℃, and judging that the air-compensating valve is in a normal opening state and the unit normally operates; and if all the conditions are not met, judging that the air supply valve is in an abnormal closing state, exiting the air supply and enthalpy increasing mode by the unit, operating according to a common mode, and simultaneously displaying fault information to remind a user.

Under a common mode, continuously detecting that the temperature-intermediate temperature of a liquid pipe of the indoor heat exchanger is less than or equal to Ht4 ℃ or the exhaust pressure corresponding saturation temperature-intermediate pressure corresponding saturation temperature is less than or equal to Ht5 ℃ or the exhaust pressure corresponding saturation temperature-intermediate temperature is less than or equal to Ht6 ℃ for a plurality of minutes, judging that the air supply valve is in a normal closing state, and the unit normally operates; and if all the conditions are not met, judging that the air supply valve is in an abnormal closing state, switching the unit to an air supply enthalpy increasing mode for operation, and displaying fault information to remind a user.

2. Refrigeration working condition

The system flow under the air-supplementing and enthalpy-increasing mode under the refrigeration working condition of the system is as follows: the high-temperature and high-pressure gaseous refrigerant at the outlet of the two-stage compressor enters the outdoor heat exchanger through the four-way valve, releases heat and condenses into high-pressure liquid refrigerant, realizes first-stage throttling through the second throttling expansion valve into intermediate-pressure vapor-liquid two-phase refrigerant, throttles the liquid refrigerant after passing through the flash evaporator into low-temperature and low-pressure refrigerant through the first throttling expansion valve, enters the indoor heat exchanger to absorb heat and evaporate into low-temperature and low-pressure gaseous refrigerant, and returns to the air suction port of the two-stage compressor after passing through the four-; the saturated gaseous refrigerant after passing through the flash evaporator enters a gas supplementing and enthalpy increasing port of the double-stage compressor through a gas supplementing electromagnetic valve.

The gulp valve based on above-mentioned two kinds of modes judges to detect:

in the air-supplementing enthalpy-increasing mode, if the temperature of a liquid pipe of the outdoor heat exchanger, namely the intermediate temperature is more than or equal to Ct1 ℃, or the exhaust pressure corresponding to the saturation temperature, namely the intermediate pressure corresponding to the saturation temperature, is more than or equal to Ct2 ℃ or the exhaust pressure corresponding to the saturation temperature, namely the intermediate temperature, is more than or equal to Ct3 ℃ is continuously detected for a plurality of minutes, the air-supplementing valve is judged to be in a normal open state; and if all the conditions are not met, judging that the air supply valve is in an abnormal closing state, exiting the air supply and enthalpy increasing mode by the unit, operating according to a common mode, and simultaneously displaying fault information to remind a user.

Under a common mode, if the temperature of a liquid pipe of the outdoor heat exchanger-the intermediate temperature is less than or equal to Ct4 ℃ or the exhaust pressure corresponding saturation temperature-the intermediate pressure corresponding saturation temperature is less than or equal to Ct5 ℃ or the exhaust pressure corresponding saturation temperature-the intermediate temperature is less than or equal to Ct6 ℃ is detected continuously for a plurality of minutes, the air supply valve is judged to be in a normal closing state, and the unit normally operates; and if all the conditions are not met, judging that the air supply valve is in an abnormal closing state, switching the unit to an air supply enthalpy increasing mode for operation, and displaying fault information to remind a user.

The flow of the double-stage compression intermediate air-supplementing enthalpy-increasing system in the embodiment of the patent is not limited to the flow of the system adopting the flash evaporator in the embodiment, and also comprises a double-stage compression intermediate air-supplementing enthalpy-increasing system adopting other general forms such as an economizer and the like; the two-stage compressor is not limited to a single-shell double-cylinder compressor, and also comprises a single-shell single-cylinder quasi-two-stage compressor, two single-stage compressors connected in series and the like.

The temperature and pressure detection judgment conditions Ht 1-Ht 6 and Ct 1-Ct 6 mentioned in the above embodiment generally range from 5 to 15 ℃.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioning system, characterized by comprising a compressor (11), a four-way valve (21), an indoor heat exchanger (31), an outdoor heat exchanger (32), a cooler (40), a first throttle expansion valve (51), a second throttle expansion valve (52), an air make-up valve (22), a first temperature detector (61) and a second temperature detector (62),

the outlet of the compressor (11) is connected with the first valve port of the four-way valve (21) through a first pipeline (71), and the inlet of the compressor (11) is connected with the first opening of the cooler (40) through a second pipeline (72);

one end of the indoor heat exchanger (31) is connected with a second valve port of the four-way valve (21), and the other end of the indoor heat exchanger (31) is connected with one end of the first throttle expansion valve (51) through a third pipeline (73);

one end of the outdoor heat exchanger (32) is connected with a third valve port of the four-way valve (21), and the other end of the outdoor heat exchanger (32) is connected with one end of the second throttle expansion valve (52);

the second opening of the cooler (40) is connected to the other end of the first throttle expansion valve (51) through a fourth pipeline (74), and the third opening of the cooler (40) is connected to the other end of the second throttle expansion valve (52) through a fifth pipeline (75);

the air compensating valve (22) is arranged on the second pipeline (72) in an openable and closable manner so as to control the on-off of the second pipeline (72);

the first temperature detector (61) is provided on the third line (73) to detect the temperature of the fluid in the third line (73), and the second temperature detector (62) is used to detect the temperature of the fluid in the fourth line (74) or the fifth line (75).

2. The air conditioning system of claim 1, further comprising:

the first temperature detector (61) and the second temperature detector (62) are electrically connected with the control module so as to transmit the detection result of the first temperature detector (61) and the detection result of the second temperature detector (62) to the control module for processing.

3. The air conditioning system of claim 2, further comprising:

and the alarm module is electrically connected with the control module and is used for sending alarm information.

4. The air conditioning system of claim 1, further comprising:

a first pressure detector (81), the first pressure detector (81) being disposed on the first pipeline (71) to detect a pressure of a fluid within the first pipeline (71).

5. The air conditioning system of claim 4, further comprising:

a second pressure detector (82), the second pressure detector (82) for detecting a pressure of fluid within the fourth line (74) or the fifth line (75).

6. The air conditioning system of claim 5, further comprising:

and the first temperature detector (61), the second temperature detector (62), the first pressure detector (81) and the second pressure detector (82) are electrically connected with the control module so as to respectively transmit detection results of the first temperature detector (61), the second temperature detector (62), the first pressure detector (81) and the second pressure detector (82) to the control module for processing.

7. Air conditioning system according to claim 1, characterized in that the cooler (40) is a flash evaporator or an economizer.

8. The air conditioning system of claim 1, further comprising:

a third temperature detector (63), the third temperature detector (63) being disposed on the second line (72) to detect a temperature of the fluid within the second line (72).

9. The air conditioning system as claimed in claim 1, wherein the other end of the outdoor heat exchanger (32) is connected to one end of the second throttle expansion valve (52) through a sixth piping (76); the air conditioning system further includes:

a fourth temperature detector (64), the fourth temperature detector (64) disposed on the sixth conduit (76) to detect a temperature of fluid within the sixth conduit (76).

10. Air conditioning system according to claim 1, characterized in that said compressor (11) is a two-stage compressor (11).