Air tightness test tool for air conditioning unit of railway vehicle

Abstract

The utility model relates to the technical field of rail transit, in particular to an air tightness test tool for an air conditioning unit of a rail vehicle, which comprises a box body provided with an air storage cavity, the box body is provided with an air inflation hole, a pressure measurement hole and a ventilation opening which are communicated with the air storage cavity, an external air source injects air into the air storage cavity through the air inflation hole, and the pressure measurement hole is communicated with the ventilation opening through the air inflation hole. The pressure measuring hole is used for communicating the air storage cavity with a pressure measuring meter, and the ventilation opening is used for being in butt joint with an air cavity opening of an air conditioning unit. The fixing frame is arranged on the box body, the fixing frame extends in the circumferential direction of the ventilation opening, and a clamping groove is formed in the side, back on to the air storage cavity, of the fixing frame in a concave mode; the first sealing ring is arranged in the clamping groove and used for sealing a gap between the fixing frame and the air conditioning unit when the ventilation opening is in butt joint with an air cavity opening of the air conditioning unit. The air tightness test tool provided by the technical scheme of the utility model can meet the air tightness test requirements of the air conditioning unit of the railway vehicle.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, and in particular to an airtightness testing fixture for air conditioning units of rail vehicles. Background Technology

[0002] During the operation of subway or suburban rail vehicles, a pressure difference exists between the air inside and outside the vehicle. If the vehicle's airtightness is inadequate, when this pressure difference reaches a certain level, problems such as whistling, abnormal noises, and localized resonance may occur inside the vehicle, leading to passenger discomfort. Air conditioning units are an essential and crucial component of rail vehicles, and their airtightness directly affects passenger comfort and operational safety. Therefore, the airtightness of rail vehicle air conditioning units is of paramount importance during the manufacturing process. According to current subway or suburban rail transit standards, the airtightness test sealing requirement for air conditioning units is: a pressure drop from 2600 Pa to 1000 Pa for ≥210 seconds.

[0003] In the process of developing this application, the inventors discovered at least the following problems in the prior art:

[0004] Because there were no applicable subway or urban rail transit standards that specified the air tightness of vehicles in detail in the early stages, and considering the economic efficiency of rail vehicle operation, no clear requirements were made for the air tightness of rail vehicle air conditioning units, resulting in the absence of tooling in the rail transit field that meets the air tightness test requirements for air conditioning units. Utility Model Content

[0005] This application provides an airtightness testing fixture for air conditioning units of rail vehicles, which aims to improve the problems mentioned in the background art.

[0006] In a first aspect, embodiments of this application provide an airtightness testing fixture for air conditioning units in rail vehicles, comprising:

[0007] The housing has an air storage chamber. The housing has an inflation port, a pressure measuring port and a vent that communicate with the air storage chamber. An external air source injects gas into the air storage chamber through the inflation port. The pressure measuring port is used to connect the air storage chamber to a pressure gauge. The vent is used to connect to the air cavity of the air conditioning unit.

[0008] A fixing frame is provided on the housing, the fixing frame extends circumferentially along the vent, and a groove is recessed on the side of the fixing frame facing away from the air storage cavity;

[0009] A first sealing ring is disposed in the slot and is used to seal the gap between the fixing frame and the air conditioning unit when the vent is connected to the air cavity of the air conditioning unit.

[0010] In some embodiments, the first sealing ring includes a fixed end and a telescopic end. The fixed end is clamped in the slot, and the telescopic end extends from the fixed end toward the bottom of the slot. In its natural state, there is a gap between the telescopic end and the slot, and the telescopic end extends out of the slot.

[0011] In some embodiments, the air conditioning unit is provided with a mounting base, and the housing is also provided with mounting feet that cooperate with the mounting base, and the mounting feet are fixedly connected to the mounting base by bolts.

[0012] In some embodiments, a first evaporation chamber and a second evaporation chamber are respectively provided at both ends of the air conditioning unit along its length, and both the first evaporation chamber and the second evaporation chamber have air inlets;

[0013] Ventilation openings are provided at both ends of the top of the box along its length, and multiple mounting feet are provided at both ends of the top of the box along its width, arranged along the length of the box.

[0014] In some embodiments, there are multiple ventilation openings, and the ventilation openings, the fixing frame, and the first sealing ring are arranged in a one-to-one correspondence;

[0015] The air cavity includes an air supply port and an air return port, and the plurality of ventilation ports include a first ventilation port and a second ventilation port, the first ventilation port and the second ventilation port being used to connect to the air supply port and the air return port, respectively.

[0016] In some embodiments, the air conditioning unit is provided with a positioning pin, and the housing is also provided with a limiting member that cooperates with the positioning pin, the limiting member having a positioning hole for the positioning pin to be inserted.

[0017] In some embodiments, the number of limiting members is two, and the two limiting members are centrally symmetrically arranged on both sides of the width direction of the box.

[0018] In some embodiments, the housing includes a frame structure and a panel assembly disposed on the frame structure. The panel assembly includes a bottom plate, a side plate, and a top plate respectively disposed at the bottom, side, and top of the frame structure. The air storage chamber is enclosed by the bottom plate, the side plate, and the top plate. The vent is disposed on the top plate. Sealing strips are sandwiched between the bottom plate, the side plate, and the top plate and the frame structure. The fixing frame is disposed on the frame structure and is supported by the frame structure.

[0019] In some embodiments, the fixed frame is provided with a connecting frame that extends into the vent, and a second sealing ring is fitted around the periphery of the connecting frame to seal the gap between the connecting frame and the top plate.

[0020] In some embodiments, the housing is provided with a first filling valve and a second filling valve at the air filling port and the pressure measuring port, respectively. The air tightness testing fixture also includes an air supply tank storing compressed air and a pressure gauge. The air source is provided by the air supply tank. The air supply tank is detachably connected to the housing through the first filling valve, and the pressure gauge is detachably connected to the housing through the second filling valve.

[0021] Compared with the prior art, this technical solution has at least the following technical advantages:

[0022] The airtightness testing fixture provided in this application has a gas storage chamber and a vent communicating with the gas storage chamber. By connecting the air conditioning unit under test to the vent, and then injecting an appropriate amount of gas into the gas storage chamber, the rate of change of gas pressure in the storage chamber can be observed to determine whether the air conditioning unit meets the airtightness requirements. Furthermore, by using a fixing frame to install a first sealing ring at the vent, this application prevents gas in the storage chamber from leaking out between the air conditioning unit and the airtightness testing fixture during the test, thus improving the testing accuracy of the airtightness testing fixture. In summary, this application provides a fixture capable of meeting the airtightness testing requirements for air conditioning units. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the airtightness testing fixture in one embodiment of the present application;

[0025] Figure 2 for Figure 1 A schematic diagram of the medium-skeletal structure;

[0026] Figure 3 for Figure 1 A schematic diagram of the fixed frame corresponding to the first ventilation opening;

[0027] Figure 4 for Figure 1 A schematic diagram of the fixed frame corresponding to the second ventilation opening;

[0028] Figure 5 for Figure 1 A schematic diagram of the structure of the mounting feet;

[0029] Figure 6 for Figure 1 A schematic diagram of the middle limiting component.

[0030] Figure label:

[0031]

[0032] Detailed Implementation

[0033] To better understand the technical solution of this utility model, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] It should be understood that the described embodiments are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0037] This application provides an airtightness testing fixture 100 for air conditioning units of rail vehicles.

[0038] For ease of description, the length direction of the airtightness testing fixture 100 is defined as the X-axis direction, the width direction is defined as the Y-axis direction, and the height direction is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are all perpendicular to each other.

[0039] The directional terms such as "upper," "lower," "top," "bottom," "left," "right," "front," and "rear" used in the description of the airtightness testing fixture 100 in this application are mainly based on the attached description of the airtightness testing fixture 100. Figure 1 The orientation of the instrument is described in the diagram, with the positive Z-axis direction as "top" or "up", the negative Z-axis direction as "bottom" or "down", the positive X-axis direction as "right", the negative X-axis direction as "left", the positive Y-axis direction as "back", and the negative Y-axis direction as "front". This does not constitute a limitation on the orientation of the airtightness testing fixture 100 in actual application scenarios.

[0040] Please see Figure 1In this embodiment of the application, the airtightness testing fixture 100 includes a housing 110, a fixing frame 121, and a first sealing ring (not shown in the figure); wherein, the housing 110 has an air storage cavity, and is provided with an inflation hole 110b, a pressure measuring hole 110c, and a vent 110a1 (and 110a2) communicating with the air storage cavity. An external air source injects gas into the air storage cavity through the inflation hole 110b, the pressure measuring hole 110c is used to connect the air storage cavity to a pressure gauge, and the vent 110a1 (and 110a2) is used to connect the air storage cavity to a pressure gauge. 110a1 (and 110a2) is used to connect with the air cavity inlet of the air conditioning unit; the fixing frame 121 is set on the housing 110, the fixing frame 121 extends circumferentially along the air cavity inlet 110a1 (and 110a2), and the fixing frame 121 is recessed on the side facing away from the air storage cavity to form a groove 121a; the first sealing ring is set in the groove 121a, and is used to seal the gap between the fixing frame 121 and the air conditioning unit when the air cavity inlet 110a1 (and 110a2) is connected with the air cavity inlet of the air conditioning unit.

[0041] In one specific embodiment, the housing 110 is provided with a first filling valve and a second filling valve at the air filling port 110b and the pressure measuring port 110c, respectively. The air tightness testing fixture 100 also includes an air supply tank and a pressure gauge. The air supply tank is detachably connected to the housing 110 through the first filling valve to provide an air source to the air storage chamber. The pressure gauge is detachably connected to the housing 110 through the second filling valve and is used to measure the air pressure in the air storage chamber in real time.

[0042] The airtightness test procedure for air conditioning components is as follows:

[0043] Connect the air cavity opening of the air conditioning unit to the ventilation openings 110a1 (and 110a2);

[0044] Install the gas supply tank and pressure gauge on the housing 110;

[0045] Inflate the gas storage chamber with gas until the pressure in the liquid storage chamber reaches 3000 Pa;

[0046] Observe the pressure gauge and start timing when the gas in the storage chamber drops to 2600Pa. Record the time t it takes for the pressure to drop to 1000Pa.

[0047] If t ≥ 210s, then the air tightness of the air conditioning unit is qualified.

[0048] It should be noted that in the above air tightness test steps, except for the air cavity opening that is connected to the air tightness test fixture 100, the drain hole, evaporator cavity opening, exhaust hole and other openings of the air conditioning unit should be plugged with rubber plugs, and the evaporator cavity cover and other doors of the air conditioning unit should be closed.

[0049] The airtightness testing fixture 100 provided in this application has a housing 110 with a gas storage chamber and ventilation openings 110a1 (and 110a2) communicating with the gas storage chamber. By connecting the air conditioning unit under test to the ventilation openings 110a1 (and 110a2), and then injecting an appropriate amount of gas into the gas storage chamber, the rate of change of gas pressure in the storage chamber can be observed to determine whether the air conditioning unit meets the airtightness requirements. In addition, by using a fixing frame 121 to set a first sealing ring at the ventilation openings 110a1 (and 110a2), this application can prevent gas in the storage chamber from overflowing from the connection point between the air conditioning unit and the airtightness testing fixture 100 during the test, which is beneficial to improving the testing accuracy of the airtightness testing fixture 100. In summary, this application provides a fixture that can meet the airtightness test requirements of air conditioning units.

[0050] In this embodiment of the application, the gas in the gas supply tank can be nitrogen, compressed air or other gases. Based on cost and safety considerations, the gas in the gas supply tank is preferably compressed air.

[0051] In one embodiment, the air conditioning unit includes a housing assembly, which includes a housing and multiple covers. A first evaporation chamber and a second evaporation chamber are respectively located at both ends along the length of the housing. Each of the first and second evaporation chambers includes a fresh air chamber, a mixing air chamber, and a ventilation chamber arranged sequentially from the middle to the end along the length of the housing. The fresh air chamber, mixing air chamber, and ventilation chamber of either the first or second evaporation chamber are selectively connected. The openings of the fresh air chamber, mixing air chamber, and ventilation chamber are all covered with covers. To improve the airtightness of the air conditioning unit, a sealing strip is provided between the cover and the housing.

[0052] In the above embodiments, the cavity wall of the mixing air chamber is provided with a drain hole and multiple granite holes. During the air tightness test of the air conditioning unit, rubber plugs are required to block the exhaust hole and granite holes.

[0053] In the above embodiments, the ventilation cavity of the first evaporation cavity or the second evaporation cavity is provided with an air cavity opening. Specifically, the air cavity opening includes an air supply opening and two air return openings, with the two air return openings respectively located on opposite sides of the air supply opening.

[0054] Correspondingly, multiple ventilation openings 110a1 (and 110a2) are provided at both ends of the top length direction of the housing 110, and the multiple ventilation openings 110a1 (and 110a2) correspond one-to-one with the air supply opening and the air return opening respectively; the number of fixing frames 121 and the number of first sealing rings are multiple, and the ventilation openings 110a1 (and 110a2), fixing frames 121 and first sealing rings are provided one-to-one. In detail, three ventilation openings 110a1 (and 110a2) are provided at both ends of the top length direction of the housing 110. One of them is the first ventilation opening 110a1, and the other two are the second ventilation openings 110a2. The two second ventilation openings 110a2 are respectively located on both sides of the first ventilation opening 110a1 in the Y-axis direction. The first ventilation opening 110a1 is used to connect to the air supply opening of the air conditioning unit, and the second ventilation opening 110a2 is used to connect to the return air opening of the air conditioning unit. The first ventilation opening 110a1 is set to correspond one-to-one with the air supply opening of the air conditioning unit, and the second ventilation opening 110a2 is set to correspond one-to-one with the return air opening of the air conditioning unit.

[0055] Understandably, in order to improve the testing accuracy of the airtightness testing fixture 100, it is also necessary to improve the sealing of the housing 110 itself, that is, to prevent the gas in the gas storage chamber from overflowing from the housing 110 during the test.

[0056] In one embodiment, the housing 110 includes a frame structure 111 and a panel assembly disposed on the frame structure 111. The panel assembly includes a bottom plate, a side plate 1122 and a top plate 1121 respectively disposed at the bottom, side and top of the frame structure 111. The air storage cavity is enclosed by the bottom plate, the side plate 1122 and the top plate 1121. The ventilation opening 110a1 (110a2) is disposed on the top plate 1121. A sealing strip is sandwiched between the bottom plate, the side plate 1122 and the top plate 1121 and the frame structure 111.

[0057] In one specific embodiment, the skeleton structure 111 is welded from multiple steel pipes, which include four columns and multiple connecting rods. The four columns extend along the Z-axis and are respectively located at the four end corners of the box body 110 at the front, rear, left, and right. The four columns and the multiple connecting rods are connected to form a support frame.

[0058] In the above specific embodiment, the front side of the support frame forms a plurality of front cover openings arranged along the X-axis direction, the rear side of the support frame forms a plurality of rear cover openings arranged along the X-axis direction, the bottom of the support frame forms a plurality of bottom cover openings arranged along the X-axis direction, and the top of the support frame forms a plurality of top cover openings arranged along the X-axis direction. The top cover openings located at the left and right ends of the support frame each form a first frame opening 1111 and two second frame openings 1112. The two second frame openings 1112 are respectively located at the opposite ends of the two first frame openings 1111 along the Y-axis direction.

[0059] In the above specific embodiment, the fixing frame 121 located at the first vent 110a1 is disposed on the frame edge of the first frame opening 1111, and the fixing frame 121 located at the second vent 110a2 is clamped on the frame edge of the second frame opening 1112. The first vent 110a1 and the first frame opening 1111 are arranged in a one-to-one correspondence, and the second vent 110a2 and the second frame opening 1112 are arranged in a one-to-one correspondence. This arrangement can distribute the pressure of the air conditioning unit to the frame structure 111 when the air conditioning unit is connected to the air tightness testing fixture 100, which is beneficial to improving the service life of the air tightness testing fixture 100.

[0060] In the above specific embodiment, the side plate 1122 includes a left side plate, a right side plate, a front side plate, and a rear side plate. There are multiple front side plates, rear side plates, bottom plates, and top plates 1121. The left side plate is covered on the left side of the support frame, the right side plate is covered on the right side of the support frame, the front side plate is covered at the front cover opening, the rear side plate is covered at the rear cover opening, the top plate 1121 is covered at the top cover opening, and the bottom plate is covered at the bottom cover opening. The front side plate and the front cover opening, the rear side plate and the rear cover opening, the top plate 1121 and the top cover opening, and the bottom plate and the bottom cover opening are all configured in a one-to-one correspondence.

[0061] In the above specific embodiments, sealing strips are provided between the left side plate, right side plate, front side plate, rear side plate, top plate 1121 and bottom plate and the support frame to prevent gas in the gas storage chamber from escaping from the joints between the left side plate, right side plate, front side plate, rear side plate, top plate 1121 or bottom plate and the support frame during the airtightness test.

[0062] In this embodiment of the application, the fixing frame 121 can be integrally formed with the top plate 1121 of the box 110 or formed separately. If only the airtightness issue is considered, it is preferable to integrally form the fixing frame 121 with the top plate 1121 of the box 110. However, since the ease of processing must also be considered in reality, the fixing frame 121 and the top plate 1121 of the box 110 are usually formed separately.

[0063] When the fixing frame 121 and the top plate 1121 of the housing 110 are formed separately, the fixing frame 121 and the top plate 1121 of the housing 110 are connected by a sealing element. In a specific embodiment, a connecting frame 122 is provided at the lower end of the fixing frame 121. The connecting frame 122 extends into the ventilation openings 110a1 (and 110a2). A second sealing ring is sleeved around the connecting frame 122 to seal the gap between the connecting frame 122 and the top plate 1121, so as to prevent the gas in the air storage chamber from escaping from the joint between the connecting frame 122 and the top plate 1121 during the air tightness test of the air conditioning unit.

[0064] In one embodiment, the first sealing ring includes a fixed end and a telescopic end, wherein the fixed end is clamped in the slot 121a, and the telescopic end extends from the fixed end toward the bottom of the slot 121a. In its natural state, there is a gap between the telescopic end and the slot 121a, and the telescopic end extends out of the slot 121a.

[0065] Specifically, the axial direction of the fixed frame 121 and the first sealing ring is the Z-axis direction. The groove 121a is recessed on the upper surface of the fixed frame 121. The lower end of the first sealing ring is the fixed end, and the upper end is the telescopic end. When the air cavity inlet of the air conditioning unit is connected to the ventilation port 110a1 (and 110a2) of the air tightness testing fixture 100, the upper end of the first sealing ring abuts against the outer periphery of the air cavity inlet of the air conditioning unit, and the upper end of the first sealing ring is compressed. Compared with the natural state, the gap between the upper end of the first sealing ring and the groove 121a is reduced.

[0066] In one embodiment, the air conditioning unit is provided with a mounting base. Correspondingly, the housing 110 of the air tightness testing fixture 100 is also provided with a mounting foot 130 that mates with the mounting base. Both the mounting foot 130 and the mounting base are provided with screw holes, and the mounting foot 130 and the mounting base are fixedly connected by bolts.

[0067] Furthermore, mounting feet 130 are provided on the frame structure 111 at the top of the housing 110 to prevent the top plate 1121 from being subjected to excessive local stress and causing its end to warp. This arrangement can improve the service life of the airtightness testing fixture 100.

[0068] In the above embodiment, more specifically, the mounting foot 130 includes a support plate and a support angle disposed below the support plate. The support plate is fixed to the frame structure 111 and has screw holes. The support plate and the support angle can be integrally formed or separately formed.

[0069] In the above embodiment, both ends of the frame structure 111 in the width direction are provided with a plurality of mounting feet 130 arranged sequentially at intervals along the X-axis, and the mounting feet 130 are provided one-to-one with the mounting base. More specifically, each top plate 1121 has a mounting foot 130 at both the front and rear ends to distribute the pressure of the air conditioning unit to various areas of the frame structure 111. This arrangement can improve the service life of the air tightness testing fixture 100.

[0070] In one embodiment, the housing 110 is provided with a limiting member 140. During the docking process between the air conditioning unit and the air tightness testing fixture 100, the limiting member 140 can help the operator to accurately control the air conditioning unit to land on the air tightness testing fixture 100 more accurately and quickly, so as to realize the rapid docking of the air conditioning unit and the air tightness testing fixture 100.

[0071] In the above embodiment, the limiting member 140 has a positioning hole 140a, and the air conditioning unit is provided with a positioning pin, which can be inserted into the positioning hole 140a of the limiting member 140. In order to avoid the top plate 1121 from being subjected to excessive local force and causing its end to warp, the limiting member 140 is provided on the frame structure 111.

[0072] In the above embodiments, there are multiple limiting members 140. In one embodiment, there are two limiting members 140. The two limiting members 140 are symmetrically arranged on both sides of the width direction of the housing 110. One limiting member 140 is located at the front end of the housing 110 and is arranged to the left of the leftmost mounting foot 130. The other limiting member 140 is located at the rear end of the housing 110 and is arranged to the right of the rightmost mounting foot 130.

[0073] In this embodiment, the positions of the first vent 110a1, the second vent 110a2, the mounting foot 130, and the limiting member 140 are generated by the projection of the air conditioning unit model onto the housing 110 (the projection when the model and the housing 110 coincide on the same center diagonal).

[0074] In this embodiment, the height of the fixing frame 121, the mounting feet 130 and the limiting member 140, the size of the housing 110, and the distance between the limiting member 140 and its adjacent mounting feet 130 can all be adjusted according to the structure of the air conditioning unit.

[0075] In one specific embodiment, the dimensions of the housing 110 are (4700~4900)mm(L)*(1740~1940)mm(W)*(800~1000)mm(H).

[0076] The fixed frame 121 is 50mm to 70mm higher than the box body 110, specifically 50mm, 55mm, 60mm, 65mm, 70mm or any value between them.

[0077] The height of mounting foot 130 is 82mm to 102mm, specifically 82mm, 86mm, 92mm, 98mm, 102mm or any value between them.

[0078] The height of the limiting member 140 is 110mm to 130mm, specifically 110mm, 114mm, 118mm, 122mm, 126mm, 130mm or any value between them.

[0079] The distance between the limiting member 140 and its adjacent mounting feet 130 is 130mm to 140mm, specifically 130mm, 132mm, 135mm, 136mm, 138mm, 140mm or any value between them.

[0080] In this embodiment, four casters are also provided at the bottom of the housing, with each caster positioned at one of the four corners of the bottom of the housing. The presence of casters at the bottom of the housing facilitates the movement of the airtightness testing fixture.

[0081] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A tooling for testing the air tightness of air conditioning units for rail vehicles, characterized in that, include: The housing has an air storage chamber. The housing has an inflation port, a pressure measuring port and a vent that communicate with the air storage chamber. An external air source injects gas into the air storage chamber through the inflation port. The pressure measuring port is used to connect the air storage chamber to a pressure gauge. The vent is used to connect to the air cavity of the air conditioning unit. A fixing frame is provided on the housing. The fixing frame extends circumferentially along the vent. A groove is recessed on the side of the fixing frame facing away from the air storage cavity. A connecting frame protrudes from the lower end of the fixing frame. The connecting frame extends into the vent. A second sealing ring is sleeved on the periphery of the connecting frame. The second sealing ring is used to seal the gap between the connecting frame and the vent. A first sealing ring is disposed in the slot and is used to seal the gap between the fixing frame and the air conditioning unit when the vent is connected to the air cavity inlet of the air conditioning unit; The housing includes a frame structure and a panel assembly disposed on the frame structure. The air storage chamber is enclosed by the panel assembly. The vent is formed on the panel assembly. The fixing frame is disposed on the frame structure and supported by the frame structure.

2. The airtightness testing fixture as described in claim 1, characterized in that, The first sealing ring includes a fixed end and a telescopic end. The fixed end is clamped in the slot, and the telescopic end extends from the fixed end toward the bottom of the slot. In its natural state, there is a gap between the telescopic end and the slot, and the telescopic end extends out of the slot.

3. The airtightness testing fixture as described in claim 1, characterized in that, The air conditioning unit is provided with a mounting base, and the housing is also provided with mounting feet that cooperate with the mounting base. The mounting feet are fixedly connected to the mounting base by bolts.

4. The airtightness testing fixture as described in claim 3, characterized in that, The air conditioning unit has a first evaporation chamber and a second evaporation chamber at both ends along its length, and both the first evaporation chamber and the second evaporation chamber have air inlets. Ventilation openings are provided at both ends of the top of the box along its length, and multiple mounting feet are provided at both ends of the top of the box along its width, arranged along the length of the box.

5. The airtightness testing fixture as described in claim 4, characterized in that, There are multiple ventilation openings, and each ventilation opening, the fixing frame, and the first sealing ring are provided in a one-to-one correspondence. The air cavity includes an air supply port and an air return port, and the plurality of ventilation ports include a first ventilation port and a second ventilation port, the first ventilation port and the second ventilation port being used to connect to the air supply port and the air return port, respectively.

6. The airtightness testing fixture as described in claim 1, characterized in that, The air conditioning unit is provided with a positioning pin, and the housing is also provided with a limiting member that cooperates with the positioning pin. The limiting member has a positioning hole for the positioning pin to be inserted.

7. The airtightness testing fixture as described in claim 6, characterized in that, The number of limiting components is two, and the two limiting components are symmetrically arranged on both sides of the width direction of the box.

8. The airtightness testing fixture as described in claim 1, characterized in that, The panel assembly includes a bottom plate, a side plate, and a top plate respectively disposed at the bottom, side, and top of the frame structure. The air storage cavity is enclosed by the bottom plate, the side plate, and the top plate. The vent is disposed on the top plate. A sealing strip is sandwiched between the bottom plate, the side plate, and the top plate and the frame structure.

9. The airtightness testing fixture as described in any one of claims 1-8, characterized in that, The housing is equipped with a first filling valve and a second filling valve at the air filling port and the pressure measuring port, respectively. The air tightness testing fixture also includes an air supply tank storing compressed air and a pressure gauge. The air source is provided by the air supply tank. The air supply tank is detachably connected to the housing through the first filling valve, and the pressure gauge is detachably connected to the housing through the second filling valve.

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