Air tightness detection system and detection method for refrigeration and heating cycle equipment

Abstract

The invention discloses an air tightness detection system and detection method for refrigeration and heating cycle equipment. The air tightness detection system comprises a reaction kettle, a liquid storage tank and an air inlet pipeline, a first electromagnetic valve is arranged on the air inlet pipeline; the reaction kettle comprises a first inlet and a first outlet; the liquid storage tank comprises a second inlet and a second outlet; the first inlet is connected with the second outlet through a first pipeline; the first outlet is connected with the second inlet through a second pipeline; a second electromagnetic valve is arranged on the first pipeline between the first inlet and the second outlet; the air inlet pipeline is communicated with a pipeline between the first pressure sensor and the second electromagnetic valve; and a third electromagnetic valve is arranged on the second pipeline. According to the invention, air tightness detection can be carried out before the refrigeration and heating circulation equipment is started each time, and air tightness detection is respectively carried out on the pipelines on the reaction kettle side and the liquid storage tank side, so that the operation stability and reliability of the refrigeration and heating circulation equipment can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to an air tightness detection system and a detection method for refrigeration and heating cycle equipment. Background Art

[0002] Refrigeration and heating circulation equipment is an instrument with both heating and cooling functions, mainly used in the fields of biology, chemical industry, etc. The refrigerant circulation of refrigeration and heating circulation equipment mostly uses fluorinated liquid, ethylene glycol and other solutions, and these solutions are corrosive to the metal pipes of refrigeration and heating circulation equipment. After the equipment has been running for a long time, the welding process of the metal pipes is inevitably unreliable, which causes leakage at the welding points and causes losses.

[0003] At present, the system stability is usually ensured by regularly testing the system pipelines for air tightness. However, regular testing of the system pipelines for air tightness cannot guarantee the air tightness of the refrigeration and heating cycle equipment every time it is running, and it is also impossible to analyze which part of the pipeline has air tightness problems. Summary of the invention

[0004] The present invention provides an air tightness detection system and a detection method for a refrigeration and heating cycle equipment to solve the problems existing in the prior art, so that the refrigeration and heating cycle equipment can be subjected to an air tightness detection before each startup, and the pipelines on the reactor side and the liquid storage tank side are respectively subjected to an air tightness detection, thereby ensuring the operating stability and reliability of the refrigeration and heating cycle equipment.

[0005] In a first aspect, the present invention provides an air tightness detection system for a refrigeration and heating cycle device, comprising: a reaction kettle, a liquid storage tank, and an air intake pipeline;

[0006] The air intake pipeline is provided with a first solenoid valve;

[0007] The reactor comprises a first inlet and a first outlet; the liquid storage tank comprises a second inlet and a second outlet; the first inlet is connected to the second outlet via a first pipeline; the first outlet is connected to the second inlet via a second pipeline;

[0008] A second solenoid valve is provided on the first pipeline between the first inlet and the second outlet; a third solenoid valve is provided on the second pipeline;

[0009] A first pressure sensor is provided on the first pipeline between the second solenoid valve and the second outlet, or a first pressure sensor is provided on the second pipeline between the second inlet and the third solenoid valve;

[0010] A second pressure sensor is provided on the first pipeline between the second solenoid valve and the first inlet, or a second pressure sensor is provided on the second pipeline between the third solenoid valve and the first outlet;

[0011] The air intake pipeline is in communication with the first pipeline, or the air intake pipeline is in communication with the second pipeline.

[0012] Optionally, a first temperature sensor is provided on the first pipeline between the second solenoid valve and the second outlet, or a first temperature sensor is provided on the second pipeline between the second inlet and the third solenoid valve;

[0013] A second temperature sensor is disposed on the first pipeline between the second solenoid valve and the first inlet, or a second temperature sensor is disposed on the second pipeline between the third solenoid valve and the first outlet.

[0014] Optionally, a one-way valve and a filter pressure reducing valve are also provided on the air intake pipeline.

[0015] Optionally, a circulation pump is provided on the first pipeline or the second pipeline.

[0016] In a second aspect, an embodiment of the present invention further provides an airtightness detection method for a refrigeration and heating cycle device, which is implemented based on the airtightness detection system for the refrigeration and heating cycle device described in any one of the above items, and includes:

[0017] After purging and draining the first pipeline and the second pipeline, controlling the first solenoid valve, the second solenoid valve and the third solenoid valve to open, so that the first pipeline and the second pipeline are passed with the first gas;

[0018] After a first preset time period, the first solenoid valve, the second solenoid valve and the third solenoid valve are closed to maintain the pressure of the first pipeline and the second pipeline on the reactor side, and to maintain the pressure of the first pipeline and the second pipeline on the liquid storage tank side;

[0019] Based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor, determine whether the air tightness of the first pipeline and the second pipeline on the reactor side and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified.

[0020] Optionally, determining whether the air tightness of the first pipeline and the second pipeline on the reactor side, and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor includes:

[0021] Acquire a first pressure value of the first pressure sensor and a second pressure value of the second pressure sensor;

[0022] After a second preset time period, obtaining a third pressure value of the first pressure sensor and a fourth pressure value of the second pressure sensor;

[0023] According to the difference between the third pressure value and the first pressure value, determine whether the air tightness of the first pipeline and the second pipeline on the reactor side is qualified; and according to the difference between the fourth pressure value and the second pressure value, determine whether the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified.

[0024] Optionally, the air tightness detection method of the refrigeration and heating cycle equipment further includes:

[0025] Acquire a first temperature value of the first temperature sensor and a second temperature value of the second temperature sensor;

[0026] After the second preset time period, obtaining a third temperature value of the first temperature sensor and a fourth temperature value of the second temperature sensor;

[0027] The first pressure value, the second pressure value, the third pressure value and the fourth pressure value are corrected based on the van der Waals equation according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value.

[0028] Optionally, determining whether the air tightness of the first pipeline and the second pipeline on the reactor side, and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor includes:

[0029] Acquire pressure values ​​of the first pressure sensor and the second pressure sensor multiple times at target time intervals;

[0030] When the pressure values ​​obtained by the first pressure sensor twice consecutively meet the first condition, it is determined that the air tightness of the first pipeline and the second pipeline on the reactor side is qualified; and when the pressure values ​​obtained by the second pressure sensor twice consecutively meet the second condition, it is determined that the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified.

[0031] Optionally, purging and draining the first pipeline and the second pipeline includes:

[0032] Controlling the first solenoid valve and the third solenoid valve to open, and controlling the second solenoid valve to close;

[0033] Inert gas is blown into the first pipeline through the air intake pipeline, so that the refrigerant in the first pipeline and the second pipeline is recovered to the liquid storage tank.

[0034] Optionally, when the air tightness of the first pipeline and the second pipeline on the reactor side is unqualified, an alarm is given in a first preset manner, and when the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is unqualified, an alarm is given in a second preset manner.

[0035] The technical solution of the present invention is that the air tightness detection system includes a reactor, a liquid storage tank and an air intake pipeline; a first solenoid valve is arranged on the air intake pipeline, the reactor includes a first inlet and a first outlet, the liquid storage tank includes a second inlet and a second outlet, the first inlet is connected to the second outlet through a first pipeline, the first outlet is connected to the second inlet through a second pipeline, a second solenoid valve is arranged on the first pipeline between the first inlet and the second outlet, the air intake pipeline is connected to the pipeline between the first pressure sensor and the second solenoid valve, and a third solenoid valve is arranged on the second pipeline, so that after the first pipeline and the second pipeline are purged and drained, the first solenoid valve, the second solenoid valve and the third solenoid valve are controlled to open, so that the first pipeline and The first gas is introduced into the second pipeline, and after a first preset time period, the first solenoid valve, the second solenoid valve and the third solenoid valve are closed to respectively maintain the pressure of the first pipeline and the second pipeline on the reactor side, and the first pipeline and the second pipeline on the liquid storage tank side, so that the air tightness of the first pipeline and the second pipeline on the reactor side, and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side can be determined based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor. In this way, the refrigeration and heating cycle equipment can be tested for air tightness each time before starting up, and the pipelines on the reactor side and the liquid storage tank side can be tested for air tightness respectively, so as to ensure the operating stability and reliability of the refrigeration and heating cycle equipment.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the structure of an air tightness detection system for a refrigeration and heating cycle device provided in Embodiment 1 of the present invention;

[0039] Figure 2 A flow chart of a method for detecting air tightness of a refrigeration and heating cycle device provided by an embodiment of the present invention;

[0040] Figure 3 A flow chart of a method for determining whether air tightness is qualified provided by an embodiment of the present invention;

[0041] Figure 4 A flow chart of another method for determining whether air tightness is qualified provided by an embodiment of the present invention;

[0042] Figure 5 A flowchart of another method for determining whether air tightness is qualified is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0045] This embodiment provides an air tightness detection system for refrigeration and heating cycle equipment, which is used to detect the air tightness of the refrigeration and heating cycle equipment. Figure 1 This is a schematic diagram of the structure of an air tightness detection system for a refrigeration and heating cycle device provided in Example 1 of the present invention, with reference to Figure 1As shown, the air tightness detection system includes a reactor 1, a liquid storage tank 2 and an air intake pipeline 001; a first solenoid valve 3 is arranged on the air intake pipeline 001; the reactor 1 includes a first inlet 11 and a first outlet 12; the liquid storage tank 2 includes a second inlet 21 and a second outlet 22; the first inlet 11 and the second outlet 22 are connected through a first pipeline 002; the first outlet 12 and the second inlet 21 are connected through a second pipeline 003; a second solenoid valve 4 is arranged on the first pipeline 002 between the first inlet 11 and the second outlet 22; a third solenoid valve 5 is arranged on the second pipeline 003 ; A first pressure sensor 6 is provided on the first pipeline 002 between the second solenoid valve 4 and the second outlet 22, or a first pressure sensor 6 is provided on the second pipeline 003 between the second inlet 21 and the third solenoid valve 5; a second pressure sensor 7 is provided on the first pipeline 002 between the second solenoid valve 4 and the first inlet 11, or a second pressure sensor 7 is provided on the second pipeline 003 between the third solenoid valve 5 and the first outlet 12; the intake pipeline 001 is connected to the first pipeline 002, or the intake pipeline 001 is connected to the second pipeline 003.

[0046] Among them, the reactor 1 can be understood as a container capable of performing physical or chemical reactions, and can achieve the heating or cooling function required by the process. Exemplarily, the reactor 1 can include, but is not limited to, a carbon steel reactor, a glass-lined reactor, a stainless steel reactor, and a nickel-based reactor. The liquid storage tank 2 is used as an expansion container and a storage tank for the refrigerant to ensure the amount of refrigerant circulating in the refrigeration and heating cycle equipment. The first inlet 11 of the reactor 1 is connected to the second outlet 22 of the liquid storage tank 2 through the first pipeline 002, and the first outlet 12 of the reactor 1 is connected to the second inlet 21 of the liquid storage tank 2 through the second pipeline 003, so that the refrigerant can circulate between the liquid storage tank 2 and the reactor 1 through the first pipeline 002 and the second pipeline 003.

[0047] One end of the air intake pipeline 001 is connected to the gas source, and the other end is connected to the first pipeline 002 and the second pipeline 003, so that the gas source can be filled into the first pipeline 002 and the second pipeline 003 through the air intake pipeline 001. In an exemplary embodiment, the gas source is an inert gas source, so that the filled gas does not react with the residual coolant in the first pipeline 002 and the second pipeline.

[0048] The first solenoid valve 3 is used to control the on-off of the intake pipeline 001. When the first solenoid valve 3 is opened, gas can be filled into the first pipeline 002 and the second pipeline 003 through the intake pipeline 001 to purge and drain the first pipeline 002 and the second pipeline 003 or to inflate and maintain pressure.

[0049] In an optional embodiment, a one-way valve 8 and a filter pressure reducing valve 9 are also provided on the air intake pipeline 001 .

[0050] The one-way valve 8 is used to limit the flow direction of the gas in the intake pipeline 001, so that the gas in the intake pipeline 001 flows to the first pipeline 002 and the second pipeline 003, and the gas in the first pipeline 002 and the second pipeline 003 flows out through the intake pipeline 001. The one-way valve 8 may include, but is not limited to, a straight-through one-way valve or a right-angle one-way valve, etc., and the present embodiment does not specifically limit the type of the one-way valve 8.

[0051] The filter pressure reducing valve 9 is used to reduce the intake pressure from the intake pipeline 001 to the first pipeline 002 and the second pipeline 003 to stabilize the intake pressure.

[0052] It should be noted that Figure 1 The filter pressure reducing valve 9, the first solenoid valve 3 and the one-way valve 8 are only exemplarily shown as being arranged in sequence on the intake pipeline 001 along the intake direction, and the relative positions of the filter pressure reducing valve 9, the first solenoid valve 3 and the one-way valve 8 are not limited. In this embodiment, the positions of the first solenoid valve 3, the one-way valve 8 and the filter pressure reducing valve 9 on the intake pipeline 001 are not specifically limited, and the functions of the first solenoid valve 3, the one-way valve 8 and the filter pressure reducing valve 9 themselves can be realized.

[0053] The second solenoid valve 4 is used to control the on-off of the first pipeline 002 between the first inlet 11 and the second outlet 22. When the second solenoid valve 4 is opened, the gas can circulate from the second outlet 22 to the first inlet 11. On the contrary, when the second solenoid valve 4 is closed, the gas cannot circulate between the second outlet 22 and the first inlet 11.

[0054] The third solenoid valve 5 is used to control the on-off of the second pipeline 003 between the first outlet 12 and the second inlet 21. When the third solenoid valve 5 is opened, the gas can circulate from the first outlet 12 to the second inlet 21. On the contrary, when the third solenoid valve 5 is closed, the gas cannot circulate between the first inlet 11 and the second outlet 22.

[0055] It should be noted that the first solenoid valve 3, the second solenoid valve 4 and / or the third solenoid valve 5 may be but are not limited to direct-acting solenoid valves or pilot-operated solenoid valves, etc. This embodiment does not specifically limit the types of the first solenoid valve 3, the second solenoid valve 4 and the third solenoid valve 5.

[0056] By setting the second solenoid valve 4 in the first pipeline 002 and the third solenoid valve 5 in the second pipeline 003, when the first pipeline 002 and the second pipeline 003 are pressurized, the second solenoid valve 4 and the third solenoid valve 5 are controlled to be closed, so that the first pipeline 002 and the second pipeline 003 on the reactor 1 side and the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side can be pressurized respectively, so that the pipelines on the reactor 1 side and the liquid storage tank 2 side can be tested for air tightness respectively.

[0057] The pressure sensor is a device or apparatus that can sense pressure signals and convert the pressure signals into usable output electrical signals according to certain rules. The first pressure sensor 6 and / or the second pressure sensor 7 may include but are not limited to diffused silicon pressure transmitters, semiconductor piezoresistance pressure sensors or electrostatic capacitance pressure sensors.

[0058] The first pressure sensor 6 is arranged on the first pipeline 002 between the second solenoid valve 4 and the second outlet 22, or on the second pipeline 003 between the second inlet 21 and the third solenoid valve 5, so that the first pressure sensor 6 can collect the pressure of the pipeline from the second solenoid valve 4 to the liquid storage tank 2, and from the liquid storage tank 2 to the third solenoid valve 5.

[0059] The second pressure sensor 7 is arranged on the first pipeline 002 between the second solenoid valve 4 and the first inlet 11, or on the second pipeline 003 between the third solenoid valve 5 and the first outlet 12, so that the second pressure sensor 7 can collect the pressure of the pipeline from the second solenoid valve 4 to the reactor 1, and from the reactor 1 to the third solenoid valve 5.

[0060] In this embodiment, the air tightness detection system includes a reactor, a liquid storage tank and an air intake pipeline; a first solenoid valve is arranged on the air intake pipeline, the reactor includes a first inlet and a first outlet, the liquid storage tank includes a second inlet and a second outlet, the first inlet is connected to the second outlet through a first pipeline, the first outlet is connected to the second inlet through a second pipeline, a first pressure sensor, a second solenoid valve and a second pressure sensor are arranged on the first pipeline between the first inlet and the second outlet in sequence, the air intake pipeline is connected to the pipeline between the first pressure sensor and the second solenoid valve, and a third solenoid valve is arranged on the second pipeline, so that after the first pipeline and the second pipeline are purged and drained, the first solenoid valve, the second solenoid valve and the third solenoid valve are controlled to be opened, So that the first gas is passed into the first pipeline and the second pipeline, after the first preset time period, the first solenoid valve, the second solenoid valve and the third solenoid valve are closed to respectively maintain the pressure of the first pipeline and the second pipeline on the reactor side, and the first pipeline and the second pipeline on the liquid storage tank side, so that the airtightness of the first pipeline and the second pipeline on the reactor side, and the airtightness of the first pipeline and the second pipeline on the liquid storage tank side can be determined based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor 7. In this way, the refrigeration and heating cycle equipment can be tested for airtightness each time before starting up, and the pipelines on the reactor side and the liquid storage tank side can be tested for airtightness respectively, so as to ensure the operating stability and reliability of the refrigeration and heating cycle equipment.

[0061] In an optional embodiment, a circulation pump 10 is provided on the first pipeline 002 or the second pipeline 003 , so that the coolant or gas can circulate between the liquid storage tank 2 and the reactor 1 through the first pipeline 002 and the second pipeline 003 .

[0062] Based on the same inventive concept, this embodiment also provides an air tightness detection method for a refrigeration and heating cycle device. The test method is implemented based on the air tightness detection system for the refrigeration and heating cycle device provided in any of the above embodiments. Figure 2 A flowchart of a method for detecting air tightness of a refrigeration and heating cycle device provided by an embodiment of the present invention, referring to Figure 2 As shown, the test method includes:

[0063] S110, after the first pipeline and the second pipeline are purged and drained, the first solenoid valve, the second solenoid valve and the third solenoid valve are controlled to open, so that the first gas flows into the first pipeline and the second pipeline.

[0064] It can be understood that when the refrigeration and heating cycle device is running, the refrigerant liquid circulates in the system under the control of the circulation pump 10, so when the refrigeration and heating cycle device is shut down, refrigerant liquid remains in the first pipeline 002 and the second pipeline 003. Purging and draining the first pipeline 002 and the second pipeline 003 may include inflating the first pipeline 002 and the second pipeline 003 through the air inlet pipeline 001, thereby back-blowing the refrigerant liquid remaining in the system to the liquid storage tank 2, thereby ensuring that the gas can fill the first pipeline 002 and the second pipeline 003 when the pressure is maintained.

[0065] Optionally, the air intake pipeline 001 is connected to the pipeline between the second solenoid valve 4 and the reactor 1; the first pipeline 002 and the second pipeline 003 are purged and drained, including: controlling the first solenoid valve 3 and the third solenoid valve 5 to open, and controlling the second solenoid valve 4 to close; blowing inert gas into the first pipeline 002 through the air intake pipeline 001, so that the refrigerant in the first pipeline 002 and the second pipeline 003 is recovered to the liquid storage tank 2.

[0066] Specifically, by controlling the first solenoid valve 3 and the third solenoid valve 5 to open, and controlling the second solenoid valve 4 to close, the intake pipe 001 can blow inert gas into the first pipe 002, so that the refrigerant in the first pipe 002 and the second pipe 003 is blown back to the liquid storage tank 2, thereby ensuring that the gas can fill the pipes when the first pipe 002 and the second pipe 003 are pressurized.

[0067] S120, after the first preset time period, close the first solenoid valve, the second solenoid valve and the third solenoid valve to maintain the pressure of the first pipeline and the second pipeline on the reactor side, and to maintain the pressure of the first pipeline and the second pipeline on the liquid storage tank side.

[0068] The first preset time may be the time for inflating the first pipeline 002 and the second pipeline 003. The first preset time is determined according to the inflation speed and the pipeline capacity, and it is sufficient to fill the pipeline with gas. In an exemplary embodiment, the first preset time is 1 minute.

[0069] By closing the first solenoid valve 3, the air inlet pipeline 001 stops inflating the first pipeline 002 and the second pipeline 003. By closing the second solenoid valve 4 and the third solenoid valve 5, the first pipeline 002 and the second pipeline 003 on the reactor 1 side and the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side are respectively pressurized.

[0070] S130. Determine whether the air tightness of the first pipeline and the second pipeline on the reactor side and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor.

[0071] Specifically, after the first pipeline 002 and the second pipeline 003 are purged and drained, the first solenoid valve 3, the second solenoid valve 4 and the third solenoid valve 5 are controlled to open, so that the first gas is introduced into the first pipeline 002 and the second pipeline 003, and after the first pipeline 002 and the second pipeline 003 are inflated for a first preset time, the first solenoid valve 3, the second solenoid valve 4 and the third solenoid valve 5 are closed, thereby maintaining the pressure of the first pipeline 002 and the second pipeline 003 on the reactor 1 side and the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side, respectively. Since the first pressure sensor 6 is arranged on the first pipeline 002 between the second solenoid valve 4 and the second outlet 22 or on the second pipeline 003 between the second inlet 21 and the third solenoid valve 5, and the second pressure sensor 7 is arranged on the first pipeline 002 between the second solenoid valve 4 and the first inlet or on the second pipeline 003 between the third solenoid valve 5 and the first outlet, based on the pressure values ​​collected by the first pressure sensor 6 and the second pressure sensor 7, the air tightness of the first pipeline 002 and the second pipeline 003 on the reactor 1 side and the air tightness of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side can be determined respectively.

[0072] Optionally, when the air tightness of the first pipeline 002 and the second pipeline 003 on the reactor 1 side is unqualified, an alarm is given in a first preset manner, and when the air tightness of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side is unqualified, an alarm is given in a second preset manner.

[0073] Among them, the first preset method may include but is not limited to at least one of sound, light, graphics and text. The second preset method may include but is not limited to at least one of sound, light, graphics and text. It should be noted that the first preset method and the second preset method may be the same or different. When the first preset method and the second preset method are the same, the alarm logic of the airtightness detection system of the refrigeration and heating cycle equipment can be simplified. When the first preset method and the second preset method are different, the location of the airtightness failure can be more intuitively reflected.

[0074] Figure 3 A flowchart of a method for determining whether air tightness is qualified provided in an embodiment of the present invention.

[0075] Optional, reference Figure 3 As shown, S130 includes:

[0076] S131. Acquire a first pressure value of a first pressure sensor and a second pressure value of a second pressure sensor.

[0077] S132. After a second preset time period, obtain a third pressure value of the first pressure sensor and a fourth pressure value of the second pressure sensor.

[0078] The second preset time period is set according to the requirement for air tightness of the system. In an exemplary embodiment, the second preset time period is 2 minutes.

[0079] S133. Determine whether the air tightness of the first pipeline and the second pipeline on the reactor side is qualified according to the difference between the third pressure value and the first pressure value; and determine whether the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified according to the difference between the fourth pressure value and the second pressure value.

[0080] In an exemplary embodiment, determining whether the air tightness of the first pipeline 002 and the second pipeline 003 on the reactor 1 side is qualified based on the difference between the third pressure value and the first pressure value may include: when the difference between the third pressure value and the first pressure value is less than the first air tightness judgment value, determining that the air tightness of the first pipeline 002 and the second pipeline 003 on the reactor 1 side is qualified; on the contrary, when the difference between the third pressure value and the first pressure value is greater than or equal to the first air tightness judgment value, determining that the air tightness of the first pipeline 002 and the second pipeline 003 on the reactor 1 side is unqualified.

[0081] In other exemplary embodiments, determining whether the air tightness of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side is qualified based on the difference between the fourth pressure value and the second pressure value may include: when the difference between the fourth pressure value and the second pressure value is less than the second air tightness judgment value, determining that the air tightness of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side is qualified; conversely, when the difference between the fourth pressure value and the second pressure value is greater than or equal to the second air tightness judgment value, determining that the air tightness of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side is unqualified.

[0082] It should be noted that the first airtightness determination value and the second airtightness determination value may be equal or unequal. Exemplarily, the first airtightness determination value and / or the second airtightness determination value is 0.013 pSI.

[0083] Optional, continue to refer to Figure 1 As shown, a first temperature sensor 13 is arranged on the first pipeline 002 between the second solenoid valve 4 and the second outlet 22, or a first temperature sensor 13 is arranged on the second pipeline 003 between the second inlet 21 and the third solenoid valve 5; a second temperature sensor 14 is arranged on the first pipeline 002 between the second solenoid valve 4 and the first inlet, or a second temperature sensor 14 is arranged on the second pipeline 003 between the third solenoid valve 5 and the first outlet.

[0084] The temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. The first temperature sensor 13 and / or the second temperature sensor 14 may include, but are not limited to, a thermocouple temperature sensor or a thermistor temperature sensor, etc., and this example does not specifically limit the types of the first temperature sensor 13 and the second temperature sensor 14.

[0085] The first temperature sensor 13 is arranged on the first pipeline 002 between the second solenoid valve 4 and the second outlet 22, or on the second pipeline 003 between the second inlet 21 and the third solenoid valve 5, so that the first temperature sensor 13 can collect the temperature of the pipeline from the second solenoid valve 4 to the liquid storage tank 2, and from the liquid storage tank 2 to the third solenoid valve 5.

[0086] The second temperature sensor 14 is arranged on the first pipeline 002 between the second solenoid valve 4 and the first inlet 11, or on the second pipeline 003 between the third solenoid valve 5 and the first outlet 12, so that the second temperature sensor 14 can collect the pressure of the pipeline from the second solenoid valve 4 to the reactor 1, and from the reactor 1 to the third solenoid valve 5.

[0087] It should be noted that Figure 1It is only exemplified that the first temperature sensor 13 is arranged on the first pipeline 002 between the third solenoid valve and the second inlet 21, and the second temperature sensor 14 is arranged on the second pipeline 003 between the second solenoid valve and the first inlet. The positions of the first temperature sensor 13 and the second temperature sensor 14 are not limited. The first temperature sensor 13 can collect the temperature of the pipeline from the second solenoid valve 4 to the liquid storage tank 2, and from the liquid storage tank 2 to the third solenoid valve 5, and the second temperature sensor 14 can collect the pressure of the pipeline from the second solenoid valve 4 to the reactor 1, and from the reactor 1 to the third solenoid valve 5.

[0088] Figure 4 A flowchart of another method for determining whether the airtightness is qualified provided by an embodiment of the present invention. Figure 4 As shown, S130 includes:

[0089] S131', acquiring a first pressure value of the first pressure sensor and a second pressure value of the second pressure sensor; and acquiring a first temperature value of the first temperature sensor and a second temperature value of the second temperature sensor.

[0090] S132′: after a second preset time period, obtain a third pressure value of the first pressure sensor and a fourth pressure value of the second pressure sensor; and obtain a third temperature value of the first temperature sensor and a fourth temperature value of the second temperature sensor.

[0091] S133', correcting the first pressure value, the second pressure value, the third pressure value and the fourth pressure value according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value based on the van der Waals equation.

[0092] The van der Waals equation is as follows:

[0093] P+(a / V 2 ) (V-nb)=nRT

[0094] Among them, P is the pressure value (unit is Pa), a and b are constants, V is the volume of the gas in the pipeline (unit is m3), N is the amount of substance in the gas in the pipeline (unit is mol), R is the molar gas constant, and T is the temperature value.

[0095] Specifically, according to the first temperature value, based on the Van der Waals equation, the first pressure value is corrected; according to the second temperature value, based on the Van der Waals equation, the second pressure value is corrected; according to the third temperature value, based on the Van der Waals equation, the third pressure value is corrected; according to the fourth temperature value, based on the Van der Waals equation, the fourth pressure value is corrected.

[0096] S134', determine whether the air tightness of the first pipeline and the second pipeline on the reactor side is qualified according to the difference between the corrected third pressure value and the corrected first pressure value; and determine whether the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified according to the difference between the corrected fourth pressure value and the corrected second pressure value.

[0097] In this embodiment, the first pressure value, the second pressure value, the third pressure value and the fourth pressure value are corrected based on the van der Waals equation according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value, so that the first pressure value, the second pressure value, the third pressure value and the fourth pressure value are more accurate, thereby improving the accuracy of the airtightness test results.

[0098] Figure 5 A flowchart of another method for determining whether the airtightness is qualified is provided in an embodiment of the present invention. Figure 5 As shown, S130 includes:

[0099] S131”, obtaining the pressure values ​​of the first pressure sensor and the second pressure sensor multiple times at target time intervals.

[0100] The target time interval is set according to the requirements for air tightness. For example, the target time interval may be 5 seconds, that is, after closing the first solenoid valve 3, the second solenoid valve 4 and the third solenoid valve 5 to maintain the pressure of the first pipeline 002 and the second pipeline 003 on the reactor 1 side, and maintaining the pressure of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side, the pressure values ​​of the first pressure sensor 6 and the second pressure sensor 7 are obtained once every 5 seconds.

[0101] S132”, when there are two consecutive pressure values ​​obtained by the first pressure sensor that meet the first condition, it is determined that the air tightness of the first pipeline and the second pipeline on the reactor side is qualified, and when the pressure values ​​obtained by the second pressure sensor two consecutive times meet the second condition, it is determined that the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified.

[0102] The first condition is set according to the air tightness requirements of the first pipeline 002 and the second pipeline 003 on the reactor 1 side, and the second condition is set according to the air tightness requirements of the first pipeline 002 and the second pipeline 003 on the liquid storage tank 2 side. It should be noted that the first condition and the second condition can be the same or different. Exemplarily, the first condition and the second condition are both that the gas leakage is less than 3 ml / min, wherein the gas leakage is calculated by the following formula:

[0103] Q=Ve×(△P / 1.013×10 5 )×(60 / t)

[0104] Where Q is the gas leakage, △P is the equivalent internal volume of the pressure difference Ve, and t is the target time interval.

[0105] In this embodiment, by acquiring the pressure values ​​of the first pressure sensor and the second pressure sensor multiple times at a target time interval, when there are two consecutive pressure values ​​acquired by the first pressure sensor that meet the first condition, it is determined that the air tightness of the first pipeline and the second pipeline on the reactor side is qualified, and when the pressure values ​​acquired by the second pressure sensor two consecutive times meet the second condition, it is determined that the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified, thereby making a secondary judgment on whether the air tightness of the first pipeline and the second pipeline on the reactor side and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified, thereby improving the reliability of the air tightness detection results.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and 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 tightness detection system for refrigeration and heating cycle equipment, characterized in that: include: Reactor, liquid storage tank and air intake pipeline; A first solenoid valve is arranged on the air intake pipeline; The reactor comprises a first inlet and a first outlet; the liquid storage tank comprises a second inlet and a second outlet; the first inlet is connected to the second outlet via a first pipeline; the first outlet is connected to the second inlet via a second pipeline; A second solenoid valve is provided on the first pipeline between the first inlet and the second outlet; a third solenoid valve is provided on the second pipeline; A first pressure sensor is provided on the first pipeline between the second solenoid valve and the second outlet, or a first pressure sensor is provided on the second pipeline between the second inlet and the third solenoid valve; A second pressure sensor is provided on the first pipeline between the second solenoid valve and the first inlet, or a second pressure sensor is provided on the second pipeline between the third solenoid valve and the first outlet; The air intake pipeline is in communication with the first pipeline, or the air intake pipeline is in communication with the second pipeline.

2. The air tightness detection system for refrigeration and heating cycle equipment according to claim 1, characterized in that: A first temperature sensor is provided on the first pipeline between the second solenoid valve and the second outlet, or a first temperature sensor is provided on the second pipeline between the second inlet and the third solenoid valve; A second temperature sensor is disposed on the first pipeline between the second solenoid valve and the first inlet, or a second temperature sensor is disposed on the second pipeline between the third solenoid valve and the first outlet.

3. The air tightness detection system for refrigeration and heating cycle equipment according to claim 1, characterized in that: The air intake pipeline is also provided with a one-way valve and a filter pressure reducing valve.

4. The air tightness detection system for refrigeration and heating cycle equipment according to claim 1, characterized in that: A circulation pump is arranged on the first pipeline or the second pipeline.

5. A method for detecting air tightness of a refrigeration and heating cycle device, implemented based on the air tightness detection system for the refrigeration and heating cycle device according to any one of claims 1 to 4, characterized in that: include: After purging and draining the first pipeline and the second pipeline, controlling the first solenoid valve, the second solenoid valve and the third solenoid valve to open, so that the first pipeline and the second pipeline are passed with the first gas; After a first preset time period, the first solenoid valve, the second solenoid valve and the third solenoid valve are closed to maintain the pressure of the first pipeline and the second pipeline on the reactor side, and to maintain the pressure of the first pipeline and the second pipeline on the liquid storage tank side; Based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor, determine whether the air tightness of the first pipeline and the second pipeline on the reactor side and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified.

6. The airtightness detection method of refrigeration and heating cycle equipment according to claim 5, characterized in that: Determining whether the air tightness of the first pipeline and the second pipeline on the reactor side, and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor, including: Acquire a first pressure value of the first pressure sensor and a second pressure value of the second pressure sensor; After a second preset time period, obtaining a third pressure value of the first pressure sensor and a fourth pressure value of the second pressure sensor; According to the difference between the third pressure value and the first pressure value, determine whether the air tightness of the first pipeline and the second pipeline on the reactor side is qualified; and according to the difference between the fourth pressure value and the second pressure value, determine whether the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified.

7. The airtightness detection method of refrigeration and heating cycle equipment according to claim 6, characterized in that: Also includes: Acquire a first temperature value of the first temperature sensor and a second temperature value of the second temperature sensor; After the second preset time period, obtaining a third temperature value of the first temperature sensor and a fourth temperature value of the second temperature sensor; The first pressure value, the second pressure value, the third pressure value and the fourth pressure value are corrected based on the van der Waals equation according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value.

8. The airtightness detection method of refrigeration and heating cycle equipment according to claim 5, characterized in that: Determining whether the air tightness of the first pipeline and the second pipeline on the reactor side, and the air tightness of the first pipeline and the second pipeline on the liquid storage tank side are qualified based on the pressure values ​​collected by the first pressure sensor and the second pressure sensor, including: Acquire pressure values ​​of the first pressure sensor and the second pressure sensor multiple times at target time intervals; When the pressure values ​​obtained by the first pressure sensor twice consecutively meet the first condition, it is determined that the air tightness of the first pipeline and the second pipeline on the reactor side is qualified; and when the pressure values ​​obtained by the second pressure sensor twice consecutively meet the second condition, it is determined that the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is qualified.

9. The airtightness detection method of refrigeration and heating cycle equipment according to claim 5, characterized in that: The first pipeline and the second pipeline are purged and drained, including: Controlling the first solenoid valve and the third solenoid valve to open, and controlling the second solenoid valve to close; Inert gas is blown into the first pipeline through the air intake pipeline, so that the refrigerant in the first pipeline and the second pipeline is recovered to the liquid storage tank.

10. The air tightness detection method of refrigeration and heating cycle equipment according to claim 5, characterized in that: When the air tightness of the first pipeline and the second pipeline on the reactor side is unqualified, an alarm is given in a first preset manner, and when the air tightness of the first pipeline and the second pipeline on the liquid storage tank side is unqualified, an alarm is given in a second preset manner.

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