CN105299840A - Multi-connected air conditioner system and fault detecting method of bypass valve of multi-connected air conditioner system - Google Patents
Multi-connected air conditioner system and fault detecting method of bypass valve of multi-connected air conditioner system Download PDFInfo
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- CN105299840A CN105299840A CN201510772333.0A CN201510772333A CN105299840A CN 105299840 A CN105299840 A CN 105299840A CN 201510772333 A CN201510772333 A CN 201510772333A CN 105299840 A CN105299840 A CN 105299840A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims description 26
- 238000005057 refrigeration Methods 0.000 claims description 21
- 230000007257 malfunction Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 30
- 238000013021 overheating Methods 0.000 abstract 1
- 238000004378 air conditioning Methods 0.000 description 37
- 230000008569 process Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000002528 anti-freeze Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a fault detecting method of a bypass valve of a multi-connected air conditioner system. The fault detecting method comprises the following steps that after the multi-connected air conditioner system receives a detection instruction of the bypass valve, the multi-connected air conditioner system is controlled to enter a test running refrigerating mode; a compressor is controlled to run at preset frequency, and only the bypass valve is controlled to be in a starting state; and the temperature value of an air return opening of the compressor and/or the pressure value of the air return opening of the compressor are/is obtained, and whether a fault happens to the bypass valve or not is judged according to the temperature value and/or the pressure value. According to the method, whether the bypass valve between an exhaust opening and the air return opening of the compressor works normally or not can be effectively and conveniently detected, and therefore the situation that the air return overheating degree of the air return opening of the compressor is too small, consequently, liquid impacts of the compressor are caused, and high-pressure protection happens to outdoor units due to too high exhaust temperature of the compressor can be effectively avoided, and then safe and reliable running of the multi-connected air conditioner system is guaranteed. The invention further discloses the multi-connected air conditioner system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fault detection method for a bypass valve body in a multi-split system and the multi-split system.
Background
In general, in a multi-split system, a bypass valve body is provided between a discharge port of a compressor and a return port of the compressor. In the running process of the multi-split system, when the return air superheat degree of the compressor is small, in order to prevent the compressor from liquid impact, a bypass valve body needs to be controlled to be opened so as to directly bypass high-pressure exhaust to a low-pressure suction side, and thus the temperature of the suction side can be continuously increased; when the exhaust temperature of the compressor is too high, the bypass valve body is controlled to be opened, so that high-pressure exhaust can be bypassed to the low-pressure suction side, the high pressure is reduced, and the outdoor unit is prevented from high-pressure protection.
However, when the bypass valve body fails, for example, the welding slag in the welding process falls into the bypass pipeline or metal debris is stripped from the pipe wall due to long-term operation to block the bypass valve body, the system cannot operate normally. Therefore, the bypass valve body needs to be detected.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a method for detecting a fault of a bypass valve in a multi-split system, which can conveniently and effectively detect whether the bypass valve is operating normally.
Another object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for detecting a fault of a bypass valve in a multi-split system, where the multi-split system includes a compressor, the bypass valve is disposed between an exhaust port of the compressor and a return port of the compressor, and the method includes the following steps: after the multi-split system receives a bypass valve body detection instruction, controlling the multi-split system to enter a test run refrigeration mode; controlling the compressor to run at a preset frequency and controlling only the bypass valve body to be in an open state; and acquiring a temperature value at the air return port of the compressor and/or a pressure value at the air return port of the compressor, and judging whether the bypass valve body fails according to the temperature value and/or the pressure value.
According to the method for detecting the fault of the bypass valve body in the multi-split system, after the multi-split system receives a detection instruction of the bypass valve body, the multi-split system is firstly controlled to enter a trial-run refrigeration mode, the compressor is controlled to run at a preset frequency, only the bypass valve body is controlled to be in an open state, then a temperature value at an air return port of the compressor and/or a pressure value at the air return port of the compressor are/is acquired, and whether the bypass valve body is in fault or not is judged according to the temperature value and/or the pressure value. Therefore, whether the bypass valve body between the exhaust port of the compressor and the return air port of the compressor works normally or not can be conveniently and effectively detected, so that the liquid impact of the compressor caused by the fact that the return air superheat degree at the return air port of the compressor is too small in the system is effectively prevented, high-pressure protection is caused to an outdoor unit caused by the fact that the exhaust temperature of the compressor is too high, and safe and reliable operation of the multi-split air system is guaranteed.
In addition, the method for detecting the fault of the bypass valve body in the multi-split system according to the invention can also have the following additional technical characteristics:
in an embodiment of the present invention, the determining whether the bypass valve body has a fault according to the temperature value and/or the pressure value specifically includes: calculating the return air superheat degree of the return air opening of the compressor according to the temperature value, and judging whether the variation of the return air superheat degree in a preset time is smaller than a preset superheat degree or not; and if the variation of the return air superheat degree is smaller than the preset superheat degree, judging that the bypass valve body has a fault.
In one embodiment of the present invention, the degree of superheat of the return air at the return air port of the compressor is calculated by the following formula:
SSH＝T1-Te，
wherein SSH is a return air superheat degree at a return air port of the compressor, T1 is a temperature value at the return air port of the compressor, and Te is a saturation temperature corresponding to a pressure of a return air refrigerant of the compressor.
In another embodiment of the present invention, the determining whether the bypass valve body is faulty according to the temperature value and/or the pressure value specifically includes: judging whether the variation of the pressure value in a preset time is smaller than a preset pressure value or not; and if the variation of the pressure value is smaller than the preset pressure value, judging that the bypass valve body breaks down.
In another embodiment of the present invention, the determining whether the bypass valve body is faulty according to the temperature value and/or the pressure value specifically includes: judging whether the compressor generates high-pressure protection or not according to the temperature value and/or the pressure value; and if the compressor has the high-pressure protection, judging that the bypass valve body has a fault.
In one embodiment of the invention, said preset frequency is less than or equal to 20 Hz.
In order to achieve the above object, in another aspect, an embodiment of the present invention provides a multi-split system, including a compressor and a bypass valve body, where the bypass valve body is disposed between a discharge port of the compressor and a return port of the compressor, and the multi-split system further includes: the temperature acquisition module is used for acquiring a temperature value at an air return port of the compressor; the control module is respectively connected with the compressor, the bypass valve body and the temperature acquisition module, after receiving a detection instruction of the bypass valve body, the control module controls the multi-split system to enter a trial-run refrigeration mode, controls the compressor to run at a preset frequency, only controls the bypass valve body to be in an open state, and judges whether the bypass valve body breaks down or not according to the temperature value.
According to the multi-split system disclosed by the embodiment of the invention, after receiving the detection instruction of the bypass valve body, the control module controls the multi-split system to operate in a trial-run refrigeration mode, controls the compressor to operate at a preset frequency, and only controls the bypass valve body to be in an open state, and then the control module judges whether the bypass valve body fails according to the temperature value at the air return port of the compressor acquired by the temperature acquisition module. Therefore, whether the bypass valve body between the exhaust port of the compressor and the return air port of the compressor works normally or not can be conveniently and effectively detected, so that the liquid impact of the compressor caused by the fact that the return air superheat degree at the return air port of the compressor is too small in the system is effectively prevented, high-pressure protection is caused to an outdoor unit caused by the fact that the exhaust temperature of the compressor is too high, and safe and reliable operation of the multi-split air system is guaranteed.
In addition, the multi-split air conditioning system according to the present invention may further have the following additional technical features:
in an embodiment of the present invention, the multiple online system further includes: and the calculation module calculates the return air superheat degree at the return air port of the compressor according to the temperature value, wherein the control module judges whether the variation of the return air superheat degree in a preset time is smaller than a preset superheat degree, and judges that the bypass valve body fails when the variation of the return air superheat degree is smaller than the preset superheat degree.
In one embodiment of the present invention, the calculation module calculates the return air superheat at the return air port of the compressor by the following formula:
SSH＝T1-Te，
wherein SSH is a return air superheat degree at a return air port of the compressor, T1 is a temperature value at the return air port of the compressor, and Te is a saturation temperature corresponding to a pressure of a return air refrigerant of the compressor.
In another embodiment of the present invention, the multiple on-line system further includes: the pressure acquisition module is used for acquiring a pressure value at an air return port of the compressor; the control module judges whether the variation of the pressure value in the preset time is smaller than a preset pressure value or not, and judges that the bypass valve body breaks down when the variation of the pressure value is smaller than the preset pressure value.
In another embodiment of the present invention, the control module further determines whether the compressor has high pressure protection according to the temperature value and/or the pressure value, and determines that the bypass valve body has a fault when the compressor has the high pressure protection.
In one embodiment of the invention, said preset frequency is less than or equal to 20 Hz.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a method of detecting a failure of a bypass valve body in a multi-split system according to an embodiment of the present invention.
Fig. 2 is a refrigerant flow diagram of a multi-split system in a heating mode according to an embodiment of the present invention.
Fig. 3 is a refrigerant flow rate diagram of a multi-split system in a cooling mode according to an embodiment of the present invention.
Fig. 4 is a refrigerant flow rate diagram when the multi-split system is in the trial cooling mode and only the bypass valve is opened according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method of detecting a malfunction of a bypass valve body in a multi-split system according to another embodiment of the present invention.
Fig. 6 is a flowchart of a method of detecting a malfunction of a bypass valve body in a multi-split system according to still another embodiment of the present invention.
Fig. 7 is a flowchart of a method of detecting a malfunction of a bypass valve body in a multi-split system according to still another embodiment of the present invention.
Fig. 8 is a block diagram schematically illustrating a multi-split system according to an embodiment of the present invention.
Fig. 9 is a block diagram schematically illustrating a multi-split system according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method of detecting a failure of a bypass valve body in a multi-split system and a multi-split system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method of detecting a failure of a bypass valve body in a multi-split system according to an embodiment of the present invention. In an embodiment of the present invention, a multi-split system includes a compressor and a bypass valve body disposed between a discharge port of the compressor and a return port of the compressor. Wherein, the bypass valve body can be a solenoid valve.
Specifically, as shown in fig. 2 or 3, the multi-split system may include a compressor 10, an outdoor heat exchanger 20, a gas-liquid separator 30, a bypass valve body 40, a four-way valve 50, an indoor heat exchanger 60, an electronic expansion valve 70, solenoid valves 81, 82, 83, 84, and 85, and check valves 91 to 97. The exhaust port of the compressor 10 is connected to one end of the bypass valve body 40, a first end of the four-way valve 50, one end of the solenoid valve 84 and one end of the solenoid valve 85, respectively, the second end of the four-way valve 50 is connected to one end of the electronic expansion valve 70 after passing through the indoor heat exchanger 60, the other end of the electronic expansion valve 70 is connected to the inlet of the check valve 97, the inlet of the check valve 96, the outlet of the check valve 95 and the other end of the solenoid valve 85, respectively, the outlet of the check valve 97 is connected to the outlet of the check valve 91 and the solenoid valves 81, 82 and 83 correspondingly disposed on the inlet pipeline of the outdoor heat exchanger 20, the outlet of the check valve 96 is connected to the third end of the four-way valve 50 and the inlet of the check valve 91, respectively, the inlet of the check valve 95 is connected to the other end of the antifreeze coiled tube 21 and the check valves 92, 93 and 94 correspondingly disposed on the, the outlet of the gas-liquid separator 30 is connected to the other end of the bypass valve body 40 and the return port of the compressor 10.
When the multi-split air-conditioning system operates in the heating mode, as shown in fig. 2, a high-temperature high-pressure gaseous refrigerant coming out of the compressor 10 is condensed by the indoor heat exchanger 60 and then becomes a high-pressure normal-temperature liquid refrigerant, is throttled and depressurized by the electronic expansion valve 70 and then becomes a low-pressure low-temperature gas-liquid mixture, then enters the outdoor heat exchanger 20 through the check valve 97, the electromagnetic valves 81, 82 and 83, absorbs heat in the outdoor heat exchanger 20 and then becomes a low-pressure low-temperature gaseous refrigerant, then enters the gas-liquid separator 30 through the check valves 95 and 96 and the four-way valve 50, and after being separated by the gas-liquid separator 30, the low-temperature low-pressure gaseous refrigerant returns to the return air inlet of the compressor.
When the multi-split air-conditioning system operates in the refrigeration mode or the defrosting mode, as shown in fig. 3, the high-temperature and high-pressure gaseous refrigerant from the compressor 10 enters the outdoor heat exchanger 20, is condensed by the outdoor heat exchanger 20 to become a high-pressure normal-temperature liquid refrigerant, is throttled and depressurized by the electronic expansion valve 70 to become a low-pressure and low-temperature gas-liquid mixture, absorbs heat in the indoor heat exchanger 60 to become a low-pressure and low-temperature gaseous refrigerant, is separated by the gas-liquid separator 30, and finally returns to the return air port of the compressor 10, thereby completing a refrigeration cycle of the multi-split air-conditioning system.
In the running process of the multi-split system, when the return air superheat degree at the air return port of the compressor is too small, the multi-split system opens a bypass valve body to directly bypass a pipeline between the exhaust port of the compressor and the air return port of the compressor, so that the return air superheat degree at the air return port of the compressor is increased, and the compressor is effectively prevented from being impacted by liquid; when the exhaust temperature of the compressor is too high, the multi-split system also opens the bypass valve body to directly bypass the pipeline from the exhaust port of the compressor to the return air port of the compressor, so that the exhaust temperature of the compressor is reduced, the outdoor unit is effectively prevented from high-pressure protection, and the multi-split system can be effectively ensured to operate safely and stably. However, if the bypass valve fails, the compressor will be subjected to liquid impact or the outdoor unit will be subjected to high-pressure protection, so that the bypass valve needs to be effectively detected.
As shown in fig. 1, the method for detecting the fault of the bypass valve body in the multi-split system comprises the following steps:
and S1, after the multi-split system receives the detection instruction of the bypass valve body, controlling the multi-split system to enter a test run cooling mode.
And S2, controlling the compressor to run at a preset frequency, and controlling only the bypass valve body to be in an open state. Wherein the preset frequency is less than or equal to 20 Hz.
Specifically, after the multi-split air conditioning system receives a bypass valve detection instruction, the multi-split air conditioning system enters a trial operation refrigeration mode, the compressor operates at a low frequency (such as a frequency less than 20Hz), and at the moment, if only the bypass valve is controlled to be in an open state, as shown in fig. 4, a high-temperature high-pressure gaseous refrigerant coming out of the compressor directly enters the air return port of the compressor through the bypass valve, so that the pressure and the temperature at the air return port of the compressor can be continuously provided, therefore, when the bypass valve works normally, the temperature at the air return port of the compressor will be continuously increased, the pressure will be continuously increased, and at the moment, whether the bypass valve fails or not can be effectively detected through a temperature value and/or a pressure value at the air return port of.
It should be noted that the multi-split system shown in fig. 2 to 4 is only one embodiment of the present invention, so that the present invention can be more clearly described by the embodiment.
S3, obtaining a temperature value at the air return port of the compressor and/or a pressure value at the air return port of the compressor, and judging whether the bypass valve body has a fault according to the temperature value and/or the pressure value.
In an embodiment of the present invention, determining whether the bypass valve body has a fault according to the temperature value and/or the pressure value specifically includes: and calculating the return air superheat degree at the return air port of the compressor according to the temperature value, judging whether the variation of the return air superheat degree in the preset time is smaller than the preset superheat degree or not, and judging that the bypass valve body has a fault if the variation of the return air superheat degree is smaller than the preset superheat degree. The preset time and the preset superheat degree can be calibrated according to actual conditions, for example, the preset time can be 1 minute, and the preset superheat degree can be 3 ℃.
In one embodiment of the present invention, the degree of superheat of return air at the return air port of the compressor is calculated by the following equation (1):
SSH＝T1-Te(1)
wherein SSH is a return air superheat degree at a return air port of the compressor, T1 is a temperature value at the return air port of the compressor, and Te is a saturation temperature corresponding to a pressure of a return air refrigerant of the compressor.
Specifically, after the multi-split air conditioning system receives a detection instruction of the bypass valve body, the multi-split air conditioning system is controlled to enter a trial operation refrigeration mode, the compressor is controlled to operate at a preset frequency (such as 20Hz), and only the bypass valve body is controlled to be in an open state, so that high-temperature and high-pressure gaseous refrigerant coming out of the compressor directly returns to the compressor through the bypass valve body. In the running process of the compressor, the temperature value at the air return port of the compressor is detected in real time, the return air superheat degree at the air return port of the compressor is calculated according to the formula (1), then the judgment is carried out, when the variation of the return air superheat degree at the air return port of the compressor is smaller than the preset superheat degree (such as 3 ℃), the fault of the bypass valve body is judged, and therefore the bypass valve body is detected quickly and effectively, related personnel can replace the bypass valve body in time, the situation that liquid impact occurs to the compressor due to the fact that the return air superheat degree at the air return port of the compressor is too small or high-pressure protection occurs to an outdoor unit due to the fact that the exhaust temperature of the compressor is too high is effectively prevented, and the safe and reliable running of.
Further, as shown in fig. 5, after the multi-split air-conditioning system receives the bypass valve detection instruction, the multi-split air-conditioning system enters a trial operation cooling mode, the compressor operates at a low frequency (for example, 20Hz), and only the bypass valve is opened (steps S101 to S102). After 1 minute, if the return air superheat degree SSH at the return air port of the compressor is not obviously increased as T1-Te, judging that the bypass valve body has a fault (step S103-104); if the return air superheat SSH at the return air port of the compressor continues to increase as T1-Te, it is determined that the bypass valve body has not failed, i.e., the bypass valve body is in a good condition (steps S105 to 106).
In another embodiment of the present invention, determining whether the bypass valve body is faulty according to the temperature value and/or the pressure value specifically includes: judging whether the variation of the pressure value in the preset time is smaller than a preset pressure value or not; and if the variation of the pressure value is smaller than the preset pressure value, judging that the bypass valve body has a fault. The preset pressure value can be calibrated according to actual conditions.
Specifically, in the embodiment of the present invention, whether the bypass valve body has a fault may also be determined according to a trend of a change in the pressure value at the air return port of the compressor. As shown in fig. 6, after the multi-split air-conditioning system receives the bypass valve detection command, the multi-split air-conditioning system enters a trial operation cooling mode, the compressor operates at a low frequency (for example, 20Hz), and only the bypass valve is opened (steps S201 to S202). After 1 minute, if the pressure value at the air return port of the compressor is not obviously increased, judging that the bypass valve body has a fault (steps S203-S204); if the pressure value at the air return port of the compressor is continuously increased, the bypass valve body is judged not to be in fault (steps S205-S206).
In another embodiment of the present invention, determining whether the bypass valve body is faulty according to the temperature value and/or the pressure value specifically includes: judging whether the compressor generates high-pressure protection according to the temperature value and/or the pressure value; and if the compressor has high-pressure protection, judging that the bypass valve body has a fault.
It should be noted that, because only the bypass valve is opened to allow only one path to be provided to the multi-split system, when the bypass valve fails, the multi-split system will be subjected to high-pressure protection, and therefore, whether the bypass valve fails or not can be determined by whether the multi-split system is subjected to high-pressure protection or not. Specifically, as shown in fig. 7, the method for detecting a fault of a bypass valve body in a multi-split system may include the following steps:
s301, the multi-split system receives a bypass valve body detection instruction.
S302, the multi-split system enters a trial operation refrigeration mode, the compressor operates at a low frequency (such as 20Hz), and only the bypass valve body is opened.
And S303, after 1 minute, judging whether the multi-split air conditioning system generates high-voltage protection. If yes, go to step S304; if not, step S305 is performed.
S304, the bypass valve body is in failure.
S305, the bypass valve body does not fail.
In summary, in the embodiment of the present invention, after the multi-split air-conditioning system receives the bypass valve detection instruction, whether the bypass valve fails or not may be determined by determining the variation of the return air superheat at the return air port of the compressor, the variation of the pressure value at the return air port of the compressor, or whether the multi-split air-conditioning system has high-pressure protection, so that relevant personnel can replace the failed bypass valve in time, thereby ensuring safe and reliable operation of the multi-split air-conditioning system.
According to the method for detecting the fault of the bypass valve body in the multi-split system, after the multi-split system receives a detection instruction of the bypass valve body, the multi-split system is firstly controlled to enter a trial-run refrigeration mode, the compressor is controlled to run at a preset frequency, only the bypass valve body is controlled to be in an open state, then a temperature value at an air return port of the compressor and/or a pressure value at the air return port of the compressor are/is acquired, and whether the bypass valve body is in fault or not is judged according to the temperature value and/or the pressure value. Therefore, whether the bypass valve body between the exhaust port of the compressor and the return air port of the compressor works normally or not can be conveniently and effectively detected, so that the liquid impact of the compressor caused by the fact that the return air superheat degree at the return air port of the compressor is too small in the system is effectively prevented, high-pressure protection is caused to an outdoor unit caused by the fact that the exhaust temperature of the compressor is too high, and safe and reliable operation of the multi-split air system is guaranteed.
A multi-split system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 2 or 3, the multi-split system includes a compressor 10 and a bypass valve body 40, and the bypass valve body 40 is disposed between a discharge port of the compressor 10 and a return port of the compressor 10. Wherein, the bypass valve body 40 can be a solenoid valve.
Specifically, as shown in fig. 2 or 3, the multi-split system may include a compressor 10, an outdoor heat exchanger 20, a gas-liquid separator 30, a bypass valve body 40, a four-way valve 50, an indoor heat exchanger 60, an electronic expansion valve 70, solenoid valves 81, 82, 83, 84, and 85, and check valves 91 to 97. The exhaust port of the compressor 10 is connected to one end of the bypass valve body 40, a first end of the four-way valve 50, one end of the solenoid valve 84 and one end of the solenoid valve 85, respectively, the second end of the four-way valve 50 is connected to one end of the electronic expansion valve 70 after passing through the indoor heat exchanger 60, the other end of the electronic expansion valve 70 is connected to the inlet of the check valve 97, the inlet of the check valve 96, the outlet of the check valve 95 and the other end of the solenoid valve 85, respectively, the outlet of the check valve 97 is connected to the outlet of the check valve 91 and the solenoid valves 81, 82 and 83 correspondingly disposed on the inlet pipeline of the outdoor heat exchanger 20, the outlet of the check valve 96 is connected to the third end of the four-way valve 50 and the inlet of the check valve 91, respectively, the inlet of the check valve 95 is connected to the other end of the antifreeze coiled tube 21 and the check valves 92, 93 and 94 correspondingly disposed on the, the outlet of the gas-liquid separator 30 is connected to the other end of the bypass valve body 40 and the return port of the compressor 10.
When the multi-split air-conditioning system operates in the heating mode, as shown in fig. 2, a high-temperature high-pressure gaseous refrigerant coming out of the compressor 10 is condensed by the indoor heat exchanger 60 and then becomes a high-pressure normal-temperature liquid refrigerant, is throttled and depressurized by the electronic expansion valve 70 and then becomes a low-pressure low-temperature gas-liquid mixture, then enters the outdoor heat exchanger 20 through the check valve 97, the electromagnetic valves 81, 82 and 83, absorbs heat in the outdoor heat exchanger 20 and then becomes a low-pressure low-temperature gaseous refrigerant, then enters the gas-liquid separator 30 through the check valves 95 and 96 and the four-way valve 50, and after being separated by the gas-liquid separator 30, the low-temperature low-pressure gaseous refrigerant returns to the return air inlet of the compressor.
When the multi-split air-conditioning system operates in the refrigeration mode or the defrosting mode, as shown in fig. 3, the high-temperature and high-pressure gaseous refrigerant from the compressor 10 enters the outdoor heat exchanger 20, is condensed by the outdoor heat exchanger 20 to become a high-pressure normal-temperature liquid refrigerant, is throttled and depressurized by the electronic expansion valve 70 to become a low-pressure and low-temperature gas-liquid mixture, absorbs heat in the indoor heat exchanger 60 to become a low-pressure and low-temperature gaseous refrigerant, is separated by the gas-liquid separator 30, and finally returns to the return air port of the compressor 10, thereby completing a refrigeration cycle of the multi-split air-conditioning system.
In the operation process of the multi-split system, when the return-air superheat degree at the return-air port of the compressor 10 is too small, the multi-split system opens the bypass valve body 40 to directly bypass the pipeline from the exhaust port of the compressor 10 to the return-air port of the compressor 10, so that the return-air superheat degree at the return-air port of the compressor 10 is increased, and the compressor 10 is effectively prevented from liquid slugging; when the exhaust temperature of the compressor 10 is too high, the multi-split air conditioning system also starts the bypass valve body 40 to directly bypass the pipeline from the exhaust port of the compressor 10 to the return port of the compressor 10, so as to reduce the exhaust temperature of the compressor 10, thereby effectively preventing the outdoor unit from generating high-pressure protection, and further effectively ensuring the multi-split air conditioning system to be capable of running safely and stably. However, if the bypass valve 40 fails, it will cause the compressor 10 to hit liquid or the outdoor unit to be protected from high pressure.
As shown in fig. 8, the multi-split system further includes: a temperature acquisition module 100 and a control module 200.
The temperature acquisition module 100 is used for acquiring a temperature value at an air return port of the compressor 10, the control module 200 is respectively connected with the compressor 10, the bypass valve body 40 and the temperature acquisition module 100, the control module 200 controls the multi-split system to enter a trial-run refrigeration mode after receiving a detection instruction of the bypass valve body, controls the compressor 10 to run at a preset frequency and only controls the bypass valve body 40 to be in an open state, and the control module 200 judges whether the bypass valve body 40 fails according to the temperature value. Wherein the preset frequency is less than or equal to 20 Hz.
Specifically, after the multi-split air-conditioning system receives a bypass valve detection instruction, the multi-split air-conditioning system enters a trial operation refrigeration mode, the compressor 10 operates at a low frequency (for example, the frequency is less than 20Hz), and at this time, if only the bypass valve 40 is controlled to be in an open state, as shown in fig. 4, a high-temperature high-pressure gaseous refrigerant coming out of the compressor 10 directly enters the air return port of the compressor 10 through the bypass valve 40, so that the pressure and the temperature at the air return port of the compressor 10 can be continuously provided, therefore, when the bypass valve 40 works normally, the temperature at the air return port of the compressor 10 will be continuously increased, the pressure will be continuously increased, and at this time, whether the bypass valve 40 fails or not can be effectively detected through a temperature value and/or a pressure value at the air.
It should be noted that the multi-split system shown in fig. 2 to 4 is only one embodiment of the present invention, so that the present invention can be more clearly described by the embodiment.
In an embodiment of the present invention, as shown in fig. 9, the multi-split system further includes: and the calculating module 300 is used for calculating the return air superheat degree at the return air port of the compressor 10 according to the temperature value, wherein the control module 200 is used for judging whether the variation of the return air superheat degree in the preset time is smaller than the preset superheat degree or not, and judging that the bypass valve body 40 has a fault when the variation of the return air superheat degree is smaller than the preset superheat degree. The preset time may be 1 minute, and the preset superheat degree may be 3 ℃.
In one embodiment of the present invention, the calculation module 300 calculates the superheat of the return air at the return air port of the compressor 10 by the above equation (1).
Specifically, after the multi-split air-conditioning system receives the bypass valve detection instruction, the control module 200 controls the multi-split air-conditioning system to enter a trial-run refrigeration mode, and controls the compressor 10 to operate at a preset frequency (for example, 20Hz) and only controls the bypass valve 40 to be in an open state, so that the high-temperature and high-pressure gaseous refrigerant from the compressor 10 directly returns to the compressor 10 through the bypass valve 40. In the operation process of the compressor 10, the temperature obtaining module 100 detects the temperature value at the air return port of the compressor 10 in real time, the calculating module 300 calculates the air return superheat degree at the air return port of the compressor 10 according to the formula (1), the control module 200 judges the calculated air return superheat degree, when the variation of the air return superheat degree at the air return port of the compressor 10 is smaller than a preset superheat degree (such as 3 ℃), the bypass valve body 40 is judged to be in fault, so that the bypass valve body 40 can be rapidly and effectively detected, relevant personnel can replace the bypass valve body 40 in time, liquid impact on the compressor 10 caused by over-low air return superheat degree at the air return port of the compressor 10 or high-pressure protection of an outdoor unit caused by over-high exhaust temperature of the compressor 10 can be effectively prevented, and the safe and reliable operation of the system can be further ensured.
Further, as shown in fig. 5, after the multi-split air-conditioning system receives a bypass valve detection instruction, the control module 200 controls the multi-split air-conditioning system to enter a trial operation refrigeration mode, controls the compressor 10 to operate at a low frequency (e.g., 20Hz), and only opens the bypass valve 40, and after 1 minute, determines whether the superheat SSH of the return air at the return air port of the compressor 10 is not significantly increased, and if the superheat SSH of the return air is not significantly increased, determines that the bypass valve 40 fails; if the return air superheat degree SSH continues to increase, it is determined that the bypass valve body 40 has not failed, that is, the bypass valve body 40 is in a good condition.
In another embodiment of the present invention, as shown in fig. 9, the multi-split system further includes: a pressure obtaining module 400, configured to obtain a pressure value at an air return port of the compressor 10; the control module 200 determines whether the variation of the pressure value within the preset time is smaller than the preset pressure value, and determines that the bypass valve body 40 fails when the variation of the pressure value is smaller than the preset pressure value.
Specifically, in the embodiment of the present invention, it is also possible to determine whether the bypass valve body 40 is malfunctioning according to a trend of a change in the pressure value at the return port of the compressor 10. Specifically, after the multi-split air conditioning system receives a bypass valve detection instruction, the control module 200 controls the multi-split air conditioning system to enter a trial operation refrigeration mode, controls the compressor 10 to operate at a low frequency (for example, 20Hz), only starts the bypass valve 40, 1 and judges whether the pressure value at the air return port of the compressor 10 is not obviously increased after minutes, and if the pressure value is not obviously increased, judges that the bypass valve 40 fails; if the pressure value continues to increase, it is judged that the bypass valve body 40 is not malfunctioning.
In another embodiment of the present invention, the control module 200 further determines whether the compressor 10 has high pressure protection according to the temperature value and/or the pressure value, and determines that the bypass valve body 40 has a fault when the compressor has high pressure protection.
It should be noted that, because only the bypass valve body 40 is opened, so that the multi-split system has only one passage, when the bypass valve body 40 fails, the multi-split system will have high-pressure protection, and therefore, whether the bypass valve body 40 fails can be determined by whether the multi-split system has high-pressure protection.
Specifically, when the multi-split air-conditioning system receives a bypass valve detection instruction, the control module 200 controls the multi-split air-conditioning system to enter a trial operation refrigeration mode, controls the compressor 10 to operate at a low frequency (such as 20Hz), only starts the bypass valve 40, judges whether the multi-split air-conditioning system has high-pressure protection after 1 minute, and judges that the bypass valve 40 has a fault if the multi-split air-conditioning system has high-pressure protection; if no high pressure protection occurs, it is determined that the bypass valve body 40 is not malfunctioning.
In summary, in the embodiment of the present invention, after the multi-split air-conditioning system receives the bypass valve detection instruction, whether the bypass valve 40 has a fault or not may be determined by determining the variation of the return air superheat at the return air port of the compressor 10, the variation of the pressure value at the return air port of the compressor 10, or whether the multi-split air-conditioning system has high-pressure protection, so that relevant personnel may replace the faulty bypass valve 40 in time, thereby ensuring safe and reliable operation of the multi-split air-conditioning system.
According to the multi-split system disclosed by the embodiment of the invention, after receiving the detection instruction of the bypass valve body, the control module controls the multi-split system to operate in a trial-run refrigeration mode, controls the compressor to operate at a preset frequency, and only controls the bypass valve body to be in an open state, and then the control module judges whether the bypass valve body fails according to the temperature value at the air return port of the compressor acquired by the temperature acquisition module. Therefore, whether the bypass valve body between the exhaust port of the compressor and the return air port of the compressor works normally or not can be conveniently and effectively detected, so that the liquid impact of the compressor caused by the fact that the return air superheat degree at the return air port of the compressor is too small in the system is effectively prevented, high-pressure protection is caused to an outdoor unit caused by the fact that the exhaust temperature of the compressor is too high, and safe and reliable operation of the multi-split air system is guaranteed.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A fault detection method for a bypass valve body in a multi-split system is characterized in that the multi-split system comprises a compressor, the bypass valve body is arranged between an exhaust port of the compressor and a return air port of the compressor, and the fault detection method comprises the following steps:
after the multi-split system receives a bypass valve body detection instruction, controlling the multi-split system to enter a test run refrigeration mode;
controlling the compressor to run at a preset frequency and controlling only the bypass valve body to be in an open state; and
and acquiring a temperature value at the air return port of the compressor and/or a pressure value at the air return port of the compressor, and judging whether the bypass valve body has a fault according to the temperature value and/or the pressure value.
2. The method for detecting the fault of the bypass valve body in the multi-split system according to claim 1, wherein the step of judging whether the bypass valve body has the fault according to the temperature value and/or the pressure value specifically comprises the steps of:
calculating the return air superheat degree of the return air opening of the compressor according to the temperature value, and judging whether the variation of the return air superheat degree in a preset time is smaller than a preset superheat degree or not; and
and if the variation of the return air superheat degree is smaller than the preset superheat degree, judging that the bypass valve body has a fault.
3. The method for detecting the failure of the bypass valve body in the multi-split system as claimed in claim 2, wherein the degree of superheat of return air at the return air port of the compressor is calculated by the following formula:
SSH＝T1-Te，
wherein SSH is a return air superheat degree at a return air port of the compressor, T1 is a temperature value at the return air port of the compressor, and Te is a saturation temperature corresponding to a pressure of a return air refrigerant of the compressor.
4. The method for detecting the fault of the bypass valve body in the multi-split system according to claim 1, wherein the step of judging whether the bypass valve body has the fault according to the temperature value and/or the pressure value specifically comprises the steps of:
judging whether the variation of the pressure value in a preset time is smaller than a preset pressure value or not; and
and if the variation of the pressure value is smaller than the preset pressure value, judging that the bypass valve body breaks down.
5. The method for detecting the fault of the bypass valve body in the multi-split system according to claim 1, wherein the step of judging whether the bypass valve body has the fault according to the temperature value and/or the pressure value specifically comprises the steps of:
judging whether the compressor generates high-pressure protection or not according to the temperature value and/or the pressure value; and
and if the compressor has the high-pressure protection, judging that the bypass valve body has a fault.
6. The method for detecting a malfunction of a bypass valve body in a multi-split system as set forth in any one of claims 1 to 5, wherein the preset frequency is less than or equal to 20 Hz.
7. The utility model provides a many online systems, its characterized in that includes compressor and bypass valve body, the bypass valve body sets up the gas vent of compressor with between the return-air port of compressor, many online systems still include:
the temperature acquisition module is used for acquiring a temperature value at an air return port of the compressor;
the control module is respectively connected with the compressor, the bypass valve body and the temperature acquisition module, after receiving a detection instruction of the bypass valve body, the control module controls the multi-split system to enter a trial-run refrigeration mode, controls the compressor to run at a preset frequency, only controls the bypass valve body to be in an open state, and judges whether the bypass valve body breaks down or not according to the temperature value.
8. The multi-split system as claimed in claim 7, further comprising:
a calculation module that calculates a return air superheat degree at a return air port of the compressor based on the temperature value, wherein,
the control module judges whether the variation of the return air superheat degree is smaller than a preset superheat degree within a preset time, and judges that the bypass valve body breaks down when the variation of the return air superheat degree is smaller than the preset superheat degree.
9. The multi-split system as claimed in claim 8, wherein the calculation module calculates a return air superheat at a return air port of the compressor by the following equation:
SSH＝T1-Te，
wherein SSH is a return air superheat degree at a return air port of the compressor, T1 is a temperature value at the return air port of the compressor, and Te is a saturation temperature corresponding to a pressure of a return air refrigerant of the compressor.
10. The multi-split system as claimed in claim 7, further comprising:
the pressure acquisition module is used for acquiring a pressure value at an air return port of the compressor; wherein,
the control module judges whether the variation of the pressure value in the preset time is smaller than a preset pressure value or not, and judges that the bypass valve body breaks down when the variation of the pressure value is smaller than the preset pressure value.
11. The multi-split system as claimed in claim 10, wherein the control module further determines whether the compressor has high pressure protection according to the temperature value and/or the pressure value, and determines that the bypass valve body has a fault when the compressor has the high pressure protection.
12. A multi-split system as claimed in any one of claims 7 to 11, wherein the preset frequency is less than or equal to 20 Hz.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225277A (en) * | 2016-08-30 | 2016-12-14 | 山东奥纳尔制冷科技有限公司 | Cold storage refrigerating system |
| CN106369697A (en) * | 2016-08-19 | 2017-02-01 | 广东美的暖通设备有限公司 | Multi-split system and failure detection method for main flow path valve body assembly of multi-split system |
| CN106679212A (en) * | 2016-08-30 | 2017-05-17 | 山东奥纳尔制冷科技有限公司 | Screw compressor unit for cold storage |
| CN109210691A (en) * | 2018-09-13 | 2019-01-15 | 珠海格力电器股份有限公司 | Fault judgment method for bypass air valve of fresh air heat recovery device and heat recovery device |
| CN110219859A (en) * | 2019-06-30 | 2019-09-10 | 潍柴动力股份有限公司 | A kind of fault detection method, device and fluid power system |
| CN111156653A (en) * | 2019-12-16 | 2020-05-15 | 珠海格力电器股份有限公司 | Fault detection method for hot defrosting electromagnetic bypass valve, storage medium and air conditioner |
| CN111486612A (en) * | 2020-04-29 | 2020-08-04 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, heating valve leakage detection method and device thereof, and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090067733A (en) * | 2007-12-21 | 2009-06-25 | 엘지전자 주식회사 | Air Conditioner and Control Method |
| CN101592362A (en) * | 2008-05-26 | 2009-12-02 | 乐金电子(天津)电器有限公司 | Air-conditioner |
| JP2010276275A (en) * | 2009-05-28 | 2010-12-09 | Aisin Seiki Co Ltd | Air conditioner |
| CN202769815U (en) * | 2012-07-09 | 2013-03-06 | 宁波奥克斯电气有限公司 | Direct current frequency conversion multi-union air-condition fault simulation device |
| CN104596147A (en) * | 2015-01-26 | 2015-05-06 | 珠海格力电器股份有限公司 | Multi-split system |
-
2015
- 2015-11-12 CN CN201510772333.0A patent/CN105299840B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090067733A (en) * | 2007-12-21 | 2009-06-25 | 엘지전자 주식회사 | Air Conditioner and Control Method |
| CN101592362A (en) * | 2008-05-26 | 2009-12-02 | 乐金电子(天津)电器有限公司 | Air-conditioner |
| JP2010276275A (en) * | 2009-05-28 | 2010-12-09 | Aisin Seiki Co Ltd | Air conditioner |
| CN202769815U (en) * | 2012-07-09 | 2013-03-06 | 宁波奥克斯电气有限公司 | Direct current frequency conversion multi-union air-condition fault simulation device |
| CN104596147A (en) * | 2015-01-26 | 2015-05-06 | 珠海格力电器股份有限公司 | Multi-split system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369697A (en) * | 2016-08-19 | 2017-02-01 | 广东美的暖通设备有限公司 | Multi-split system and failure detection method for main flow path valve body assembly of multi-split system |
| CN106225277A (en) * | 2016-08-30 | 2016-12-14 | 山东奥纳尔制冷科技有限公司 | Cold storage refrigerating system |
| CN106679212A (en) * | 2016-08-30 | 2017-05-17 | 山东奥纳尔制冷科技有限公司 | Screw compressor unit for cold storage |
| CN109210691A (en) * | 2018-09-13 | 2019-01-15 | 珠海格力电器股份有限公司 | Fault judgment method for bypass air valve of fresh air heat recovery device and heat recovery device |
| CN110219859A (en) * | 2019-06-30 | 2019-09-10 | 潍柴动力股份有限公司 | A kind of fault detection method, device and fluid power system |
| CN111156653A (en) * | 2019-12-16 | 2020-05-15 | 珠海格力电器股份有限公司 | Fault detection method for hot defrosting electromagnetic bypass valve, storage medium and air conditioner |
| CN111156653B (en) * | 2019-12-16 | 2021-01-29 | 珠海格力电器股份有限公司 | Fault detection method for hot defrosting electromagnetic bypass valve, storage medium and air conditioner |
| CN111486612A (en) * | 2020-04-29 | 2020-08-04 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, heating valve leakage detection method and device thereof, and storage medium |
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|---|---|
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