A gas-liquid separator pressure equalizing hole detection device and detection method

Abstract

The present invention provides a gas-liquid separator pressure equalizing hole detection device and detection method, the detection device comprises a gas-liquid separator, a gas storage bottle and a liquid storage tank; the gas-liquid separator comprises an air inlet pipe, an air outlet pipe and a cylinder; the gas-liquid separator and the gas storage bottle are connected through the air inlet pipe; the gas-liquid separator and the liquid storage tank are connected through the air outlet pipe; the pressure equalizing hole is arranged on the air outlet pipe and is located inside the cylinder, and the gas inside the cylinder can enter the liquid storage tank through the pressure equalizing hole. The gas-liquid separator pressure equalizing hole detection device has a simple structure, does not require a prototype, has a low detection cost, and can quickly and accurately determine the size of the pressure equalizing hole of the gas-liquid separator.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a gas-liquid separator pressure equalizing hole detection device and a detection method. Background Art

[0002] The ambient temperature range of the air conditioner is relatively large. In low temperature conditions, the evaporator's evaporation capacity is insufficient, or the air conditioner's control system does not respond in time, which may cause a large amount of refrigerant liquid to return to the suction side of the compressor. The compressor is prone to liquid hammer. Excessive refrigerant dilutes the compressor oil, affecting the normal operation of the compressor. Generally, a gas-liquid separator is configured on the suction side of the compressor. The main function of the gas-liquid separator is to store part of the refrigerant in the system. It should be able to transport enough refrigerant and oil back to the compressor to maintain the system's operating efficiency and the oil level in the crankcase. The exhaust volume of the compressors used in the prior art multi-compressor parallel air-conditioning system is not much different, which can facilitate the balance of the refrigerant oil between the compressors. Therefore, at the outlet of the gas-liquid separator, the refrigerant oil in the compressor is stored in the air-conditioning system. A pressure equalizing hole is set at the pipe, so that when the compressor just starts to run, the pressure at the outlet is low, and the hydraulic refrigerant and oil stored in the outlet pipe will flow along the outlet pipe toward the outlet. The amount of oil return can be controlled by the aperture size of the pressure equalizing hole. If the aperture of the pressure equalizing hole is too small, it will not have the pressure equalization effect. If the aperture of the pressure equalizing hole is too large, it will affect the oil carrying capacity of the oil return hole of the gas-liquid separator when the air conditioner is normally operating. At present, whether the size of the pressure equalizing hole is appropriate is determined by experimental methods. A visible liquid pipe is welded on the gas-liquid separator, and the air conditioner is run. The size of the pressure equalizing hole is determined by observing the liquid level of the gas-liquid separator when the air conditioner is stopped. This experimental method determines the size of the pressure equalizing hole, which requires making prototypes and disassembling and assembling test units. The detection cost is high, the detection method is complicated, and it wastes time and manpower. Summary of the invention

[0003] The technical problem solved by the invention is how to quickly and accurately determine the size of the pressure equalizing hole of the gas-liquid separator.

[0004] In order to solve the above technical problems, the present invention provides a gas-liquid separator pressure equalizing hole detection device, comprising: a gas-liquid separator, a gas storage bottle and a liquid storage tank; the gas-liquid separator comprises an air inlet pipe, an air outlet pipe and a cylinder; the gas-liquid separator and the gas storage bottle are connected through the air inlet pipe; the gas-liquid separator and the liquid storage tank are connected through the air outlet pipe; the pressure equalizing hole is arranged on the air outlet pipe and is located inside the cylinder, and the gas inside the cylinder can enter the liquid storage tank through the pressure equalizing hole.

[0005] The gas-liquid separator pressure equalizing hole detection device has a simple structure, does not require a prototype, and has a low detection cost.

[0006] Furthermore, a pressure gauge is provided on the cylinder to detect the pressure inside the cylinder.

[0007] Furthermore, the air intake pipe is divided into an air intake pipe outer section and an air intake pipe inner section, the air intake pipe outer section is located outside the cylinder and is connected to the gas storage bottle, and the air intake pipe inner section is located inside the cylinder.

[0008] Furthermore, the air outlet pipe is divided into an outer section and an inner section. The outer section is located outside the cylinder and connected to the liquid storage tank, and the inner section is located inside the cylinder.

[0009] Furthermore, the inner section of the air outlet pipe is a U-shaped structure, the pressure equalizing hole is arranged at the upper part of the inner section of the air outlet pipe, and the oil return hole is arranged at the bottom of the inner section of the air outlet pipe.

[0010] When the air conditioner is operating normally, the U-shaped structure can store liquid refrigerant and refrigerating oil. When the compressor is just started, the pressure at the outlet of the outlet pipe is low, causing the liquid refrigerant and refrigerating oil in the U-shaped structure to flow towards the outlet. At this time, air is taken in by the air inlet pipe, and the gas enters the U-shaped structure of the outlet pipe from the pressure equalizing hole to balance the pressure in the U-shaped structure. By controlling the size of the pressure equalizing hole, an appropriate amount of liquid refrigerant and refrigerating oil can flow back into the compressor of the air conditioner.

[0011] Furthermore, the air inlet pipe is detachably connected to the gas storage bottle, and the air outlet pipe is detachably connected to the liquid storage tank.

[0012] In order to determine the gas-liquid separator with a suitable pressure equalizing hole diameter, it is necessary to prepare multiple gas-liquid separators with pressure equalizing holes of different diameters and test them in order from small to large pressure equalizing hole diameters. The gas-liquid separator needs to be disassembled and assembled for each test. Therefore, it is necessary to choose a connection method that is easy and quick to disassemble and assemble, reusable and highly reliable.

[0013] Furthermore, a first valve is provided on the outlet of the gas storage cylinder for controlling the flow of gas in the gas storage cylinder.

[0014] Furthermore, the gas cylinder is filled with carbon dioxide gas, and the size of the pressure equalization hole is detected by using carbon dioxide gas, which will not cause environmental pollution.

[0015] Furthermore, a second valve is provided at the outlet of the liquid storage tank for observing whether liquid flows out of the liquid storage tank 130 .

[0016] The present invention also provides a method for detecting a pressure equalizing hole of a gas-liquid separator, comprising the following steps:

[0017] Step S100, loading the marking liquid into the gas-liquid separator, and connecting the gas-liquid separator, the gas storage bottle and the liquid storage tank with pipelines;

[0018] Step S200, opening the first valve at the outlet of the gas cylinder, opening the second valve at the outlet of the liquid storage tank, and closing the first valve and the second valve after the detection device is ventilated for a first preset time T1;

[0019] Step S300, opening the first valve to allow the gas in the gas storage cylinder to slowly enter the interior of the gas-liquid separator, and when the value of the pressure gauge reaches the first preset pressure P1, closing the first valve to maintain the pressure of the gas-liquid separator at the first preset pressure P1 for a second preset time T2;

[0020] Step S400, opening the first valve to allow the gas in the gas storage cylinder to quickly enter the interior of the gas-liquid separator, so that the value of the pressure gauge reaches the second preset pressure P2 within a third preset time T3, and closing the first valve;

[0021] Step S500: open the second valve and observe whether there is marking liquid flowing out of the second valve.

[0022] Furthermore, there are multiple gas-liquid separators, and the pressure equalizing holes of the multiple gas-liquid separators have different apertures.

[0023] Furthermore, the step S100 to the step S500 are repeated in the order of the pressure equalizing hole diameter from small to large, and the gas-liquid separator is tested until no marked liquid flows out of the second valve, indicating that the diameter of the pressure equalizing hole is appropriate.

[0024] The gas-liquid separator pressure equalizing hole detection method has simple operating steps and strong operability, which saves time and manpower and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a gas-liquid separator pressure equalizing hole detection device;

[0027] Figure 2 It is a schematic flow chart of the gas-liquid separator pressure equalizing hole detection method.

[0028] Description of reference numerals:

[0029] 110-gas-liquid separator; 111-inlet pipe; 1111-outer section of the inlet pipe; 1112-inner section of the inlet pipe; 112-outlet pipe; 1121-outer section of the outlet pipe; 1122-inner section of the outlet pipe; 113-cylinder; 114-pressure equalizing hole; 115-oil return hole; 116-pressure gauge; 120-gas cylinder; 121-first valve; 130-liquid storage tank; 131-second valve. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Example 1

[0032] See also Figure 1 A gas-liquid separator pressure equalizing hole detection device comprises a gas-liquid separator 110, a gas storage bottle 120 and a liquid storage tank 130, wherein the gas-liquid separator 110 comprises an air inlet pipe 111, an air outlet pipe 112 and a cylinder 113; the gas-liquid separator 110 and the gas storage bottle 120 are connected via the air inlet pipe 111; the gas-liquid separator 110 and the liquid storage tank 130 are connected via the air outlet pipe 112; a pressure equalizing hole 114 is arranged on the air outlet pipe and is located inside the cylinder 113, and the gas in the cylinder 113 can enter the liquid storage tank 130 through the pressure equalizing hole 114; a pressure gauge 116 is arranged on the cylinder 113 for detecting the pressure inside the cylinder 113.

[0033] Specifically, the air intake pipe 111 is divided into an air intake pipe outer section 1111 and an air intake pipe inner section 1112 . The air intake pipe outer section 1111 is located outside the cylinder 113 and is connected to the gas storage bottle 120 , and the air intake pipe inner section 1112 is located inside the cylinder 113 .

[0034] The air outlet pipe 112 is divided into an air outlet pipe outer section 1121 and an air outlet pipe inner section 1122 . The air outlet pipe outer section 1121 is located outside the cylinder 113 and communicated with the liquid storage tank 130 , and the air outlet pipe inner section 1122 is located inside the cylinder 113 .

[0035] The inner section 1122 of the air outlet pipe is a U-shaped structure. A pressure equalizing hole 114 is provided at the upper portion of the inner section 1122 of the air outlet pipe, and an oil return hole 115 is provided at the bottom of the inner section 1122 of the air outlet pipe.

[0036] When the air conditioner is operating normally, the U-shaped structure can store liquid refrigerant and refrigerating oil. When the compressor is just started, the pressure at the outlet of the outlet pipe is low, causing the liquid refrigerant and refrigerating oil in the U-shaped structure to flow towards the outlet. At this time, air is taken in by the air inlet pipe, and the gas enters the U-shaped structure of the outlet pipe from the pressure equalizing hole to balance the pressure in the U-shaped structure. By controlling the size of the pressure equalizing hole, an appropriate amount of liquid refrigerant and refrigerating oil can flow back into the compressor of the air conditioner.

[0037] The air inlet pipe 111 is detachably connected to the gas storage bottle 120 , and the air outlet pipe 112 is detachably connected to the liquid storage tank 130 .

[0038] Furthermore, a first valve 121 is provided on the outlet of the gas storage cylinder 120 , and the first valve 121 is threadedly connected to the air inlet pipe 111 .

[0039] Specifically, a copper nut is welded to the end of the air inlet pipe 111 of the gas-liquid separator 110, and the gas-liquid separator 110 and the gas storage bottle 120 are threadedly connected through the copper nut and the first valve 121; a copper nut is welded at the port of the air outlet pipe 112 of the gas-liquid separator 110, and a single joint is welded at the inlet of the liquid storage tank 130, and the gas-liquid separator 110 and the liquid storage tank 130 are threadedly connected through the copper nut and the single joint; the copper nut and the single joint are firmly connected and easy to disassemble.

[0040] In order to determine the gas-liquid separator with a suitable pressure equalizing hole diameter, it is necessary to prepare multiple gas-liquid separators with pressure equalizing holes of different diameters and test them in order from small to large pressure equalizing hole diameters. The gas-liquid separator needs to be disassembled and assembled for each test. Therefore, it is necessary to choose a connection method that is easy and quick to disassemble and assemble, reusable and highly reliable.

[0041] The gas cylinder 120 is filled with carbon dioxide gas, and the size of the pressure equalization hole is detected by using the carbon dioxide gas, which will not cause environmental pollution.

[0042] A second valve 131 is provided at the lower outlet of the liquid storage tank 130 to observe whether liquid flows out of the liquid storage tank 130 .

[0043] The gas-liquid separator pressure equalizing hole detection device has a simple structure, does not require a prototype, and has a low detection cost.

[0044] Example 2

[0045] See also Figure 1-2 , a method for detecting a pressure equalizing hole of a gas-liquid separator, the specific steps of which are as follows:

[0046] Step S100, the detection device is placed in a room at 25°C, the gas-liquid separator 110 is filled with identification liquid, which covers the oil return hole 115, and the height of the identification liquid is about half of the height of the cylinder 113, and the gas-liquid separator 110, the gas storage bottle 120 and the liquid storage tank 130 are connected by pipelines.

[0047] The marking liquid is a colored liquid, preferably red.

[0048] Step S200, open the first valve 121 at the outlet of the gas cylinder 120, open the second valve 131 at the outlet of the liquid storage tank 130, and after the detection device is ventilated for the first preset time T1, close the first valve 121 and the second valve 131.

[0049] After the pipelines of the gas-liquid separator 110, the gas cylinder 120 and the liquid storage tank 130 are connected, the high-pressure gas in the gas cylinder 120 enters the liquid storage tank 130 through the gas-liquid separator 110, and then is discharged through the second valve 131. After ventilation for a period of time, the air in the detection device is discharged.

[0050] The first preset time T1 is preferably 60S.

[0051] Step S300, open the first valve 121, so that the gas in the gas storage bottle 120 slowly enters the interior of the cylinder 113 of the gas-liquid separator 110. When the value of the pressure gauge 116 reaches the first preset pressure P1, close the first valve 121 to maintain the pressure of the cylinder 113 at the first preset pressure P1 and continue for the second preset time T2.

[0052] The first preset pressure P1 is preferably 0.55 MPa, and the second preset time T2 is preferably 10 min.

[0053] During the second preset time T2, the gas in the gas-liquid separator 110 and the liquid storage tank 130 communicate with each other until a pressure equilibrium state is reached.

[0054] Step S400, open the first valve 121, so that the gas in the gas storage bottle 120 quickly enters the interior of the cylinder 113 of the gas-liquid separator 110, so that the value of the pressure gauge reaches the second preset pressure P2 within the third preset time T3, and close the first valve 121.

[0055] The third preset time T3 is preferably 30S, and the second preset pressure P2 is preferably 1.0 MPa.

[0056] The size of the pressure equalizing hole is related to the pressure difference between the gas-liquid separator and the suction side of the compressor at the moment of shutdown, as well as the refrigerant density ratio between the moment of shutdown and normal operation. When the air conditioner is heating at rated power, the pressure difference between the gas-liquid separator and the suction side of the compressor at the moment of shutdown is about 0.45MPa, and the ratio of the gaseous refrigerant density between the moment of shutdown and normal operation is about 1.8.

[0057] Therefore, under the room temperature of 25℃, the pressure parameters of the detection process are set according to the pressure difference of 0.45MPa and the density ratio of 1.8. The specific parameters are as follows:

[0058] The room temperature is 25℃, the pressure gauge shows a pressure of 0.55MPa, and the density of carbon dioxide gas is 20.897kg / m3, which is the pressure state of the gas-liquid separator when simulating the normal operation of the air conditioner;

[0059] The pressure gauge shows a pressure of 1.0MPa and a carbon dioxide gas density of 38.355kg / m3. This simulates the pressure state of the gas-liquid separator when the air conditioner is shut down. At this time, the pressure difference is 1.0-0.55=0.45MPa, and the carbon dioxide gas density ratio is 38.355 / 20.897=1.8.

[0060] Step S500 , opening the second valve 131 , and observing whether there is marking liquid flowing out of the second valve 131 .

[0061] If the marked liquid flows out from the second valve 131 , it means that the size of the pressure equalizing hole of the gas-liquid separator 120 is too small. If no marked liquid flows out from the second valve 131 , it means that the size of the pressure equalizing hole of the gas-liquid separator 120 is appropriate.

[0062] Step S600: When the marked liquid flows out from the second valve 131, replace the gas-liquid separator with a pressure equalizing hole with a larger aperture, and repeat steps S100 to S500.

[0063] In order to determine the gas-liquid separator with a suitable pressure equalizing hole diameter, a plurality of gas-liquid separators with pressure equalizing holes of different diameters are prepared and tested in order of pressure equalizing hole diameter from small to large until no marked liquid flows out of the second valve 131, indicating that the size of the pressure equalizing hole is suitable.

[0064] The gas-liquid separator pressure equalizing hole detection method has simple operation steps and strong operability, saves time and manpower, and improves detection efficiency.

[0065] Finally, it should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0066] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas-liquid separator pressure equalizing hole detection device, characterized in that: include: A gas-liquid separator (110), a gas storage bottle (120) and a liquid storage tank (130); The gas-liquid separator (110) comprises an air inlet pipe (111), an air outlet pipe (112) and a cylinder (113); The gas-liquid separator (110) and the gas storage bottle (120) are in communication with each other via the air inlet pipe (111); The gas-liquid separator (110) and the liquid storage tank (130) are in communication with each other via the gas outlet pipe (112); The pressure equalizing hole (114) is arranged on the gas outlet pipe (112) and is located inside the cylinder (113), and the gas inside the cylinder (113) can enter the liquid storage tank (130) through the pressure equalizing hole (114); The air intake pipe (111) is divided into an air intake pipe outer section (1111) and an air intake pipe inner section (1112); the air intake pipe outer section (1111) is located outside the cylinder (113) and is in communication with the gas storage bottle (120); and the air intake pipe inner section (1112) is located inside the cylinder (113); The air outlet pipe (112) is divided into an air outlet pipe outer section (1121) and an air outlet pipe inner section (1122), the air outlet pipe outer section (1121) is located outside the cylinder (113) and is connected to the liquid storage tank (130), and the air outlet pipe inner section (1122) is located inside the cylinder (113); The inner section (1122) of the air outlet pipe is a U-shaped structure, the pressure equalizing hole (114) is arranged at the upper part of the inner section (1122) of the air outlet pipe, and the oil return hole (115) is arranged at the bottom of the inner section (1122) of the air outlet pipe.

2. A gas-liquid separator pressure equalizing hole detection device according to claim 1, characterized in that: The cylinder (113) is provided with a pressure gauge (116).

3. A gas-liquid separator pressure equalizing hole detection device according to claim 1, characterized in that: The air inlet pipe (111) is detachably connected to the gas storage bottle (120), and the air outlet pipe (112) is detachably connected to the liquid storage tank (130).

4. A gas-liquid separator pressure equalizing hole detection device according to claim 1, characterized in that: A first valve (121) is provided at the outlet of the gas storage bottle (120).

5. A gas-liquid separator pressure equalizing hole detection device according to claim 1, characterized in that: The gas storage cylinder (120) contains carbon dioxide gas.

6. A gas-liquid separator pressure equalizing hole detection device according to claim 1, characterized in that: A second valve (131) is provided at the outlet of the liquid storage tank (130).

7. A method for detecting a pressure equalizing hole of a gas-liquid separator, characterized in that: The gas-liquid separator pressure equalizing hole detection device is applied to any one of claims 1 to 6, and the gas-liquid separator pressure equalizing hole detection method comprises the following steps: Step S100: the gas-liquid separator (110) is filled with a marking liquid, and the gas-liquid separator (110), the gas storage bottle (120) and the liquid storage tank (130) are connected by pipelines; Step S200: opening the first valve (121) at the outlet of the gas storage bottle (120), opening the second valve (131) at the outlet of the liquid storage tank (130), and closing the first valve (121) and the second valve (131) after the detection device is ventilated for a first preset time T1; Step S300: opening the first valve (121) to allow the gas in the gas storage bottle (120) to slowly enter the interior of the gas-liquid separator (110); when the value of the pressure gauge (116) reaches a first preset pressure P1, closing the first valve (121) to maintain the pressure of the gas-liquid separator (110) at the first preset pressure P1 for a second preset time T2; Step S400: opening the first valve (121) to allow the gas in the gas storage bottle (120) to quickly enter the interior of the gas-liquid separator (110), so that the value of the pressure gauge (116) reaches a second preset pressure P2 within a third preset time T3, and closing the first valve (121); Step S500: Open the second valve (131) and observe whether marking liquid flows out of the second valve (131).

8. A method for detecting a pressure equalizing hole of a gas-liquid separator according to claim 7, characterized in that: There are a plurality of gas-liquid separators (110), and the pressure equalizing holes (114) of the plurality of gas-liquid separators (110) have different apertures.

9. A method for detecting a pressure equalizing hole of a gas-liquid separator according to claim 8, characterized in that: Repeat steps S100 to S500 in the order of the diameter of the pressure equalizing hole (114) from small to large, and inspect the gas-liquid separator (110) until no marked liquid flows out of the second valve (131), indicating that the diameter of the pressure equalizing hole (114) is appropriate.

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