Air tightness detection device

Abstract

The air tightness detection device comprises a gas tank, the gas tank is connected with a flange connecting disc, the outer end face of the flange connecting disc is provided with an installation groove, an installation hole penetrating through the inner end face of the flange connecting disc is arranged in the installation groove, a connecting table of a motor is installed in the installation groove, and an output shaft of the motor is installed in the installation hole. A fixing piece is arranged on the flange connecting disc, a pressing plate is connected to the fixing piece, a containing groove is formed in the pressing plate, a motor penetrates through the containing groove, the end face, opposite to the flange connecting disc, of the pressing plate is attached to a connecting table of the motor, and the motor is fixed to the flange connecting disc through the pressing plate; an air conveying hole is formed in the outer end face of the flange connecting disc and used for being connected with an air outlet of an air pump. According to the device, the motor is placed on the flange connecting disc, then the pressing plate is matched with the fixing part, fixing holes in the motor are not needed, the integrity of the fixing holes in the motor is guaranteed, and the situation that damaged screws damage threads in the fixing holes in the motor after long-term use is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection equipment, and specifically relates to an airtightness detection device. Background Art

[0002] After the product is processed, in order to ensure its quality after leaving the factory, a series of tests are often carried out on the product, such as air tightness test of the produced motor. Through air tightness test, whether there is a poor sealing problem on the motor is detected to prevent the motor from leaving the factory due to poor sealing, resulting in water or other liquids entering the motor during use, thus causing danger. For the detection of motor air tightness, the traditional water detection method is inefficient. In order to improve the detection efficiency in motor detection, an air tightness detection device is usually used.

[0003] At present, in the existing air tightness detection device, the motor is fixed by screws, that is, the fixing holes set on the motor connecting platform are aligned with the connecting holes set in the device, and the screws are screwed in the aligned connecting holes and fixing holes with the help of an electric wrench, so as to fix the motor in the device. In the fixing process, in order to ensure the stability of the motor during the detection process, screws are often screwed in each fixing hole of the motor. Although this fixing method can stably fix the motor in the device, when detecting another motor, the screws need to be removed, and then the motor is fixed in the same way, so that fixing and disassembly are time-consuming and laborious, and the reciprocating disassembly can easily damage the threads on the screws, and in the process of fixing another motor, the screws with damaged threads can easily damage the threads in the fixing holes on the motor; at the same time, in the process of fixing the motor with screws, the screws come out of the fixing holes, which will cause many scratches on the outer casing of the motor, affecting the aesthetics of the motor. Utility Model Content

[0004] In order to solve the problem that it is time-consuming and laborious to fix the motor by screws in the existing airtightness detection device, and it is easy to cause many scratches on the motor, the utility model provides an airtightness detection device.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An air tightness detection device, comprising a gas tank, the gas tank is connected to a flange connection plate, an outer end surface of the flange connection plate is provided with a mounting groove, a mounting hole penetrating the inner end surface of the flange connection plate is provided in the mounting groove, a connecting platform of a motor is installed in the mounting groove, and an output shaft of the motor is installed in the mounting hole;

[0007] The flange connection plate is provided with a fixing piece at the side of the installation groove, the fixing piece is connected with a pressing plate, the pressing plate is provided with a placement groove, the motor is passed through the placement groove, and the end surface of the pressing plate opposite to the flange connection plate is attached to the connection platform of the motor, and the motor is fixed to the flange connection plate through the pressing plate;

[0008] An air delivery hole is arranged on the outer end surface of the flange connection plate, and the air delivery hole is used to connect to the air outlet of the air pump.

[0009] Preferably, a sealing ring is glued into the mounting groove.

[0010] Preferably, the sealing ring is made of natural rubber.

[0011] Preferably, the fixing member is a fixing screw, a connecting hole is provided on the flange connecting plate, a through hole is provided on the pressure plate at a position corresponding to the connecting hole, and the fixing screw is screwed into the through hole and the corresponding connecting hole.

[0012] Preferably, a connecting groove is provided on the flange connecting plate at a side position of the mounting groove, a second fixing portion is installed in the connecting groove, and the second fixing portion is used to fix the pressing plate;

[0013] The second fixing part comprises a mounting frame, a connecting plate is rotatably mounted in the mounting frame, and a compression spring is connected between the end of the connecting plate close to the flange connecting plate and the inner wall of the mounting frame;

[0014] A slide groove is provided on the side end surface of the connecting plate at a position away from the flange connecting disk, a clamping plate is slidably connected in the slide groove, and one end of the clamping plate is attached to the end surface of the pressure plate away from the flange connecting disk.

[0015] Preferably, a positioning groove is provided on the pressing plate, and the clamping plate is clamped in the positioning groove.

[0016] Preferably, an adjustment rod is screwed onto the end of the connecting plate away from the flange connecting plate, and the adjustment rod extends to the outside of the mounting frame. A spring is installed in the slide groove, one end of the spring is connected to the clamping plate, and the other end of the spring is connected to the inner wall of the slide groove.

[0017] Preferably, rubber pads are provided on the inner wall of the placement groove and on the end surface of the pressure plate opposite to the flange connection plate.

[0018] Preferably, a first fixing portion is provided on the gas tank, and the first fixing portion is connected to the flange connection plate;

[0019] The first fixing part includes an extended screw, a first fixing hole is arranged on the flange connection plate, a second fixing hole is arranged on the outer bottom surface of the gas tank at a position corresponding to the first fixing hole, the extended screw is passed through the second fixing hole and the first fixing hole, and a fixing nut is screwed on the end of the extended screw.

[0020] Preferably, the gas delivery hole is connected to a pressure gauge and a valve, and the valve is connected to the gas outlet of the air pump.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] The utility model discloses an air tightness detection device, in which a connection platform of an electric motor is installed through a mounting groove arranged on a flange connection plate, and then the motor is fixed on the flange connection plate through a pressure plate cooperating with a fixing part. In this fixing method, it is not necessary to use the fixing holes on the motor, thereby ensuring the integrity of the fixing holes on the motor, and avoiding that during the process of fixing the motor with the fixing holes on the motor, the screws damaged after long-term use damage the threads in the fixing holes on the motor; at the same time, in the present device, the motor is fixed by a pressure plate, and the contact area between the device and the motor is increased by the pressure plate, thereby increasing the reliability and stability of the motor fixation, avoiding scratches on the motor housing by the screws, and protecting the integrity of the motor housing during the detection process.

[0023] Furthermore, in the present device, a sealing ring is glued in the installation groove, and the sealing ring is made of natural rubber. The ductility of natural rubber is used to increase the sealing between the installation groove and the motor, thereby preventing gas leakage from occurring at the connection platform between the installation groove and the motor during the motor air tightness test, thereby affecting the accuracy of the motor air tightness test data.

[0024] Furthermore, the fixing parts in the present device are fixing screws, which are screwed into the through holes and the connecting holes to fix the pressure plate on the flange connecting plate. The pressure plate can be quickly fixed by the fixing screws, thereby improving the efficiency of the device in fixing the motor. Through the rigidity of the fixing screws, the motor can be stably fixed on the flange connecting plate during the air tightness test, thereby increasing the stability of the device in fixing the motor.

[0025] Furthermore, in the device, a second fixing part is installed on the flange connection plate. During the process of the pressure plate fixing the motor on the flange connection plate, the clamping plate is rotated by rotating the connection plate. After the pressure plate is placed, the pressure plate is fixed by the clamping plate. The fixing is convenient and quick, thereby improving the fixing speed of the motor on the flange connection plate, and further improving the air tightness detection speed of the motor.

[0026] Furthermore, in the device, a positioning groove is provided on the pressing plate, and the movement of the pressing plate is limited by the clamping plate clamped in the positioning groove, thereby preventing the movement of the pressing plate from causing damage to the outer wall of the motor.

[0027] Furthermore, an adjusting rod is provided on the outer end of the connecting plate in the second fixing part of the device. The adjusting rod cooperates with the spring to adjust the distance between the clamping plate and the flange connecting plate, so that the clamping plate can be adjusted according to the thickness of the pressure plate. After the pressure plate is fixed to the motor, if the motor can still shake, the adjusting rod is used to adjust the distance between the pressure plate and the flange connecting plate to reduce the distance between the pressure plate and the flange connecting plate, so as to further fix the motor so that the motor is stably fixed on the flange connecting plate.

[0028] Furthermore, the device is provided with a first fixing hole at a position corresponding to the second fixing hole on the front end surface of the flange connecting plate, the first fixing hole is aligned with the second fixing hole, and an extension screw is passed through the aligned second fixing hole and the first fixing hole, and fixing nuts are screwed on the end heads of both ends of the extension screw. The flange connecting plate is stably fixed to the gas tank through the cooperation of the fixing nut and the extension screw, thereby increasing the stability of the connection between the flange connecting plate and the gas tank, and avoiding the appearance of a large gap between the fitting end faces of the flange connecting plate and the gas tank after the gas pipe is filled with gas, which affects the device's detection of the air tightness of the motor.

[0029] Furthermore, the device is provided with a pressure gauge and a valve on the gas delivery hole on the flange connection plate. The pressure in the gas tank is detected by the pressure gauge. When the gas pressure in the gas tank reaches a certain value, the filling of the gas tank is stopped. By observing the change of the pressure value on the pressure gauge, the air tightness status of the motor can be intuitively obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the front structure of an airtightness detection device provided by the utility model;

[0031] Figure 2 A schematic side view of a partial cross-section of an air tightness detection device provided by the utility model;

[0032] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0033] In the attached drawings: 1. flange connection plate; 10. mounting groove; 11. air delivery hole; 12. mounting hole; 14. connecting hole; 2. first fixing part; 3. second fixing part; 30. mounting frame; 31. adjusting rod; 32. clamping plate; 33. compression spring; 34. spring; 35. connecting plate; 350. slide groove; 4. sealing ring; 5. pressure plate; 50. placement groove; 6. motor; 7. gas tank. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1-Figure 3 The utility model discloses an airtightness detection device, which comprises an open gas tank 7, wherein the opening position of the gas tank 7 is connected with a flange connection plate 1, and the connection mode is connected through a first fixing portion 2, that is, a plurality of second fixing holes are arranged on the outer bottom surface of the gas tank 7, and the second fixing holes are evenly arranged around the bottom end surface of the gas tank 7 in the circumferential direction, and a first fixing hole is arranged on the front end surface of the flange connection plate 1 at a position corresponding to the second fixing hole, and the first fixing hole is aligned with the second fixing hole, and an extended screw is inserted into the aligned second fixing hole and the first fixing hole, and the first fixing hole and the second fixing hole are extended from both ends of the extended screw. The outside of the fixed hole is provided, and a fixing nut is screwed on the end of the first fixing hole on the extended screw, and one end face of the fixing nut is fitted with the front end face of the flange connecting plate 1; a fixing nut is screwed on the end of the second fixing hole on the extended screw, and one end face of the fixing nut is fitted with the outer bottom surface of the gas tank 7, and the flange connecting plate 1 is stably fixed on the gas tank 7 through the cooperation of the fixing nut and the extended screw; at the same time, a sealing rubber pad is arranged between the flange connecting plate 1 and the opening of the gas tank 7, and the airtightness inside the gas tank 7 is ensured by the sealing rubber pad, thereby reducing the influence of the sealing of the gas tank 7 on the airtightness detection data of the motor 6.

[0041] See also Figure 1-Figure 3, a plurality of mounting grooves 10 are arranged on the front end surface of the flange connection plate 1, and a mounting hole 12 penetrating the inner end surface of the flange connection plate 1 is arranged on the bottom end surface of each mounting groove 10, and the gas tank 7 is connected to the mounting groove 10 through the mounting hole 12, and a connecting platform of the motor 6 is installed in the mounting groove 10, and the output shaft of the motor 6 is installed in the mounting hole 12, and the gas enters the interior of the motor 6 from the mounting hole 12 by inflating the gas tank 7, so as to detect the air tightness between the various components on the motor 6; the flange connection plate 1 is provided with a connecting hole 14 at the side position of the mounting groove 10, and a fixing piece is installed in the connecting hole 14, and a pressing plate 5 is connected to the fixing piece, and a through hole is arranged on the pressing plate 5 at a position corresponding to the connecting hole 14, and the fixing piece is screwed into the connecting hole 14 and the through hole corresponding to the connecting hole 14, so as to fix the pressing plate 5 on the flange connection plate 1, and then the pressing plate 5 is pressed on one end surface of the connecting platform on the motor 6, and the action of the fixing piece makes the motor 6 The other end face of the connecting platform is fitted on the bottom end face of the mounting groove 10, and the motor 6 is fixed on the flange connecting plate 1 to prevent the motor 6 from moving during the air tightness test and affecting the accuracy of the motor air tightness test data; a placement groove 50 is provided on the pressure plate 5, and the placement groove 50 is used to pass the pressure plate 5 on the motor 6, so that one end face of the pressure plate 5 can be completely fitted on one end face of the motor 6 connecting platform. In this fixing method, there is no need to use the fixing holes provided on the motor 6 connecting platform, which ensures the integrity of the fixing holes on the motor 6 and avoids the screws damaged after long-term use during the process of fixing the motor 6 with the fixing holes on the motor 6. Damage to the threads in the fixing holes on the motor 6; at the same time, the contact area between the device and the motor 6 at the fixed position is increased by the pressure plate 5, thereby increasing the reliability and stability of the motor 6 fixation, avoiding scratches on the outer shell of the motor 6 by screws, and protecting the integrity of the motor shell during the detection process.

[0042] See also Figure 1 A gas delivery hole 11 is provided on the front end surface of the flange connection plate 1, and a pressure gauge and a valve are connected to the gas delivery hole 11. The valve is connected to the gas outlet of the air pump through a pipeline, and gas is input into the gas tank 7 through the air pump, and the gas pressure in the gas tank reaches a preset value; and in the process of the air pump conveying gas into the gas tank 7, the pressure value of the current gas in the gas tank 7 is detected by the pressure gauge, and when the gas pressure in the gas tank 7 reaches a certain value, the filling of the gas tank 7 is stopped, and the air tightness state of the motor is intuitively obtained by observing the change of the pressure value on the pressure gauge.

[0043] See also Figure 1-Figure 3A sealing ring 4 is provided on the bottom end surface inside the mounting groove 10, one end of the sealing ring 4 is glued to the bottom end surface inside the mounting groove 10, and the other end is attached to the end surface of the motor 6 connecting platform relative to the bottom end surface inside the mounting groove 10, which is used for sealing between the motor 6 connecting platform and the bottom end surface inside the mounting groove 10. The sealing ring 4 is made of natural rubber, and the ductility of natural rubber is used to increase the sealing between the motor 6 connecting platform and the bottom end surface inside the mounting groove 10, so as to avoid gas leakage between the motor 6 connecting platform and the bottom end surface inside the mounting groove 10 during the air tightness detection process of the motor 6, which affects the accuracy of the air tightness detection data of the motor 6.

[0044] See also Figure 1-Figure 3 , a connecting groove is provided on the flange connecting plate 1 at the side position of the mounting groove 10, and a second fixing part 3 is installed in the connecting groove, and the second fixing part 3 is used to fix the pressure plate 5; the second fixing part 3 includes a mounting frame 30, and a connecting plate 35 is rotatably installed in the mounting frame 30, and a compression spring 33 is connected between the end of the connecting plate 35 close to the flange connecting plate 1 and the inner wall of the mounting frame 30. When the connecting plate 35 is rotated by an external force to a certain angle, the connecting plate 35 is released, and the connecting plate 35 can be reset by the compression spring 33. In this example, the end of the flange connecting plate 1 on the connecting plate 35 is rotated toward a position away from the mounting groove 10; the side end surface of the connecting plate 35 is away from the flange connecting plate A slide groove 350 is provided at the position of the disk 1, and the slide groove 350 passes through the other end surface of the connecting plate 35. A track groove is placed in the slide groove 350 along the length of the connecting plate 35, and a connecting square shaft is slidably provided in the track groove. A clamping plate 32 is connected to the connecting square shaft, and one end of the clamping plate 32 is attached to the end surface of the pressure plate 5 away from the flange connecting disk 1; in the process of the pressure plate 5 fixing the motor 6 on the flange connecting disk 1, the clamping plate 32 is rotated by the rotation of the connecting plate 35. After the pressure plate 5 is placed, the pressure plate 5 is fixed by the clamping plate 32. The fixing is convenient and quick, which improves the fixing speed of the motor 6 on the flange connecting disk 1, thereby improving the air tightness detection speed of the motor 6.

[0045] See also Figure 2 and Figure 3 A positioning groove is provided on the outer end surface of the pressing plate 5, and the clamping plate 32 is clamped in the positioning groove. The clamping plate 32 is clamped in the positioning groove to limit the movement of the pressing plate 5, thereby preventing the movement of the pressing plate 5 from causing damage to the outer wall of the motor 6.

[0046] See also Figure 2 and Figure 3An adjusting rod 31 is screwed on the end of the connecting plate 35 away from the flange connecting disk 1, and the adjusting rod 31 extends to the outside of the mounting frame 30. A spring 34 is installed in the slide groove 350, one end of the spring 34 is connected to the clamping plate 32, and the other end of the spring 34 is connected to the inner wall of the slide groove 350; through the cooperation of the adjusting rod 31 and the spring 34, the distance between the clamping plate 32 and the flange connecting disk 1 is adjusted, so that the clamping plate 32 can be adjusted according to the thickness of the pressing plate 5, and when the pressing plate 5 fixes the motor 6, if the motor 6 can still shake, the adjusting rod 31 is used to adjust the distance between the pressing plate 5 and the flange connecting disk 1 to reduce the distance between the pressing plate 5 and the flange connecting disk 1, and further fix the motor 6 so that the motor 6 is stably fixed on the flange connecting disk 1.

[0047] Preferably, rubber pads are provided on the inner wall of the placement groove 50 and the end surface of the pressure plate 5 opposite to the flange connection plate 1, so as to prevent the device from damaging the outer wall of the motor 6.

[0048] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0049] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. An airtightness detection device, characterized in that: The invention comprises a gas tank (7), the gas tank (7) being connected to a flange connection plate (1), a mounting groove (10) being provided on the outer end surface of the flange connection plate (1), a mounting hole (12) penetrating the inner end surface of the flange connection plate (1) being provided in the mounting groove (10), a connection platform for a motor (6) being installed in the mounting groove (10), and an output shaft of the motor (6) being installed in the mounting hole (12); The flange connection plate (1) is provided with a fixing piece at a side position of the installation groove (10), the fixing piece is connected with a pressing plate (5), the pressing plate (5) is provided with a placement groove (50), the motor (6) is inserted into the placement groove (50), and the end surface of the pressing plate (5) relative to the flange connection plate (1) is attached to the connection platform of the motor (6), and the motor (6) is fixed to the flange connection plate (1) through the pressing plate (5); An air delivery hole (11) is provided on the outer end surface of the flange connection plate (1), and the air delivery hole (11) is used to connect to the air outlet of an air pump.

2. The airtightness detection device according to claim 1, characterized in that: A sealing ring (4) is glued into the installation groove (10).

3. The airtightness detection device according to claim 2, characterized in that: The sealing ring (4) is made of natural rubber.

4. The airtightness detection device according to claim 1, characterized in that: The fixing member is a fixing screw, the flange connection plate (1) is provided with a connecting hole (14), the pressure plate (5) is provided with a through hole at a position corresponding to the connecting hole (14), and the fixing screw is screwed into the through hole and the corresponding connecting hole (14).

5. The airtightness detection device according to claim 1, characterized in that: The flange connection plate (1) is provided with a connection groove at a side position of the installation groove (10), and a second fixing portion (3) is installed in the connection groove, and the second fixing portion (3) is used to fix the pressure plate (5); The second fixing portion (3) comprises a mounting frame (30), a connecting plate (35) is rotatably mounted inside the mounting frame (30), and a compression spring (33) is connected between an end of the connecting plate (35) close to the flange connecting plate (1) and an inner wall of the mounting frame (30); A slide groove (350) is provided on the side end surface of the connecting plate (35) at a position away from the flange connecting plate (1), and a clamping plate (32) is slidably connected in the slide groove (350), and one end of the clamping plate (32) is attached to the end surface of the pressure plate (5) away from the flange connecting plate (1).

6. The airtightness detection device according to claim 5, characterized in that: The pressure plate (5) is provided with a positioning groove, and the clamping plate (32) is clamped in the positioning groove.

7. The airtightness detection device according to claim 5, characterized in that: An adjusting rod (31) is screwed onto the end of the connecting plate (35) away from the flange connecting plate (1), and the adjusting rod (31) extends to the outside of the mounting frame (30). A spring (34) is installed in the slide groove (350), one end of the spring (34) is connected to the clamping plate (32), and the other end of the spring (34) is connected to the inner wall of the slide groove (350).

8. The airtightness detection device according to claim 1, characterized in that: Rubber pads are provided on the inner wall of the placement groove (50) and on the end surface of the pressure plate (5) facing the flange connection plate (1).

9. The airtightness detection device according to claim 1, characterized in that: The gas tank (7) is provided with a first fixing portion (2), and the first fixing portion (2) is connected to the flange connection plate (1); The first fixing portion (2) comprises an extended screw, a first fixing hole is provided on the flange connection plate (1), a second fixing hole is provided on the outer bottom surface of the gas tank (7) at a position corresponding to the first fixing hole, the extended screw is passed through the second fixing hole and the first fixing hole, and a fixing nut is screwed on the end of the extended screw.

10. The airtightness detection device according to claim 1, characterized in that: The gas delivery hole (11) is connected to a pressure gauge and a valve, and the valve is connected to the gas outlet of the air pump.

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