Air tightness detection device

Abstract

The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device, and aims to solve the problems that an existing air tightness detection device is highly dependent on external contour characteristics of equipment to be detected, and special detection devices among different pieces of equipment to be detected are difficult to share. In order to achieve the purpose, the air tightness detection device comprises a sealed inflation mechanism, the sealed inflation mechanism comprises a shell, a pull rod, a driving part, a first sealing ring and an inflation channel, the pull rod is configured to extend into an air inlet under the driving of the driving part and form positioning with the shell, and the pull rod is further configured to be separated from the shell under the driving of the driving part. Therefore, the air tightness detection device is convenient to operate. Besides, the air tightness detection device is positioned through the pull rod and the air inlets of the equipment to be detected, so that the air inlets are high in size uniformity, the universality of the air tightness detection device is high, and the cost of the air tightness detection device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device. Background Art

[0002] When performing an air tightness test on the reassembled electric drive assembly, it is necessary to install a dedicated detection device on the electric drive assembly housing to achieve a fixed connection with the housing and seal the air inlet of the housing so as to perform an air tightness test on the electric drive assembly.

[0003] However, to ensure airtightness with the electric drive assembly's air inlet, existing detection devices typically include multiple connection structures designed to match the surface features of the electric drive assembly's outer shell, ensuring a secure connection. This results in a high dependency of the dedicated detection device on the external contours of the electric drive assembly, making it difficult to share dedicated detection devices across different electric drive assemblies. Furthermore, changes to the external contours of the electric drive assembly require the design of a new dedicated detection device, increasing the cost of the dedicated detection device.

[0004] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the existing airtightness detection device is highly dependent on the external contour characteristics of the equipment to be detected, it is difficult to share special detection devices between different equipment to be detected, and when the external contour characteristics of the equipment to be detected change, it is necessary to design a new special detection device, which increases the cost of the special detection device.

[0006] The utility model provides an airtightness detection device, which is used to detect the airtightness of a device to be detected. The device to be detected includes a housing, and the housing is provided with an air inlet. The airtightness detection device includes:

[0007] A housing having a sliding hole;

[0008] a pull rod assembled in the slide hole;

[0009] a driving portion connected to the pull rod to drive the pull rod to slide along the sliding hole;

[0010] a first sealing ring, which is provided at the housing or the outer shell to achieve sealing between the housing and the air inlet, and

[0011] an air charging channel formed between the housing, the pull rod and the air charging port for charging the device to be detected;

[0012] The pull rod is configured to extend into the air inlet and form a position with the housing under the drive of the driving portion, and the pull rod is also configured to be separated from the housing under the drive of the driving portion.

[0013] In the preferred technical solution of the above-mentioned air tightness detection device, the first end of the pull rod has a connecting structure, which can extend into the air inlet and hook the inner wall of the shell of the device to be detected to achieve positioning, and the connecting structure can also be detached from the air inlet.

[0014] In a preferred technical solution of the above-mentioned airtightness detection device, the connection structure is a "T"-shaped connection portion, and the projection of the end face of the "T"-shaped connection portion away from the shell on the vertical plane is non-circular.

[0015] In a preferred technical solution of the above-mentioned air tightness detection device, the sliding hole is a through hole, and the second end of the pull rod can extend out of the housing.

[0016] In a preferred technical solution of the above-mentioned air tightness detection device, a second sealing ring is provided between the sliding hole and the pull rod, and the sliding hole is sealed with the pull rod through the second sealing ring.

[0017] In the preferred technical solution of the above-mentioned airtightness detection device, the driving unit includes:

[0018] a cam connected to the second end of the pull rod so that the cam can drive the pull rod when rotating;

[0019] A positioning structure is provided on the cam so that the cam can be positioned at a preset angle under the action of the positioning structure.

[0020] In a preferred technical solution of the above-mentioned airtightness detection device, the positioning structure includes a positioning surface provided on the cam.

[0021] In the preferred technical solution of the above-mentioned airtightness detection device, the end face of the first end of the shell contacts the surface of the housing of the device to be detected and the contour matches, and the first sealing ring is installed on the end face of the first end of the shell.

[0022] In the preferred technical solution of the above-mentioned air tightness detection device, the inflation channel includes an inflation port and an air outlet, the inflation port is provided on the shell or the pull rod, the air outlet is provided on the shell and / or the pull rod, and the air outlet is located on the inner side of the first sealing ring.

[0023] In a preferred technical solution of the above-mentioned airtightness detection device, the housing includes a first end cover and a second end cover, and the first end cover is separately connected to the second end cover.

[0024] When the above technical solution is adopted, the utility model drives the pull rod to slide along the sliding hole when testing the air tightness of the device to be tested, so that the pull rod can be extended into the air inlet under the drive of the driving part and form a position with the shell of the device to be tested. At this time, the pull rod is driven by the driving part to slide along the sliding hole so that the shell and the shell of the device to be tested are close to each other. In the process of the shell gradually approaching the shell of the device to be tested, the shell and the air inlet can be sealed by the first sealing ring. In this way, the tester can connect the external air source with the inflation channel to achieve inflation into the device to be tested. After the air tightness test is completed, the pull rod is driven by the driving part to slide along the sliding hole so that the pull rod can be separated from the shell of the device to be tested, and the test work is completed. Through the above setting method, the air tightness testing device of the present application is more convenient to operate. In addition, in the utility model, positioning is achieved by the pull rod and the air inlet of the device to be tested. Based on this, due to the high uniformity of the size of the air inlet, the air tightness testing device of the utility model has high commonality, thereby reducing the cost of the air tightness testing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following describes a preferred embodiment of the present invention by taking the electric drive assembly as an example and combining the accompanying drawings, in which:

[0026] Figure 1 It is a structural schematic diagram of the air tightness detection device of the present invention when the pull rod is located in the first position.

[0027] Figure 2 yes Figure 1 A partial enlarged view of area A in the middle.

[0028] Figure 3 It is a structural schematic diagram of the air tightness detection device of the present invention with the pull rod located in the sealing position.

[0029] Figure 4 This is a structural schematic diagram of another air tightness detection device of the present invention, in which the pull rod is located in the first position.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the air tightness detection device of the present utility model.

[0031] List of reference numerals:

[0032] 1. Air tightness detection device; 11. Housing; 111. First end cover; 112. Second end cover; 113. Slide hole; 1131. First slide hole; 1132. Second slide hole; 12. Pull rod; 121. First axis; 122. Second axis; 123. Third axis; 124. Fourth axis; 13. Drive unit; 131. Cam; 132. Positioning structure; 133. Drive handle; 14. Inflation channel; 141. Air outlet; 142. Inflation port; 15. First sealing ring; 16. Second sealing ring; 17. Connecting structure; 18. Sleeve; 19. Limit plate; 110. Air nozzle; 2. Electric drive assembly housing; 21. Air inlet. DETAILED DESCRIPTION

[0033] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications. For example, although the description is presented in conjunction with an electric drive assembly, it is clear that these embodiments may also be applied to other container housings and sealing structures having a sealing function.

[0034] It should be noted that in the description of this utility model, terms such as "center," "front," "back," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In the description of this utility model, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0035] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0036] Figure 1 It is a structural schematic diagram of an airtightness detection device according to an embodiment of the present invention, in which the pull rod is located in the first position. Figure 2 This utility model Figure 1 A partial enlarged view of area A in the middle. Figure 3It is a structural schematic diagram of an airtightness detection device according to an embodiment of the utility model, in which the pull rod is located in a sealing position. Figure 4 This is a structural schematic diagram of another air tightness detection device of the present invention, in which the pull rod is located in the first position. Figure 5 It is a schematic diagram of the three-dimensional structure of an airtightness detection device according to one embodiment of the present utility model.

[0037] like Figure 1 See also Figure 2 、 Figure 3 、 Figure 4 and Figure 5To address the problem that existing airtightness testing devices are highly dependent on the external contour features of the device to be tested, making it difficult to share dedicated testing devices between different devices, and requiring the design of new dedicated testing devices when the external contour features of the device to be tested change, which increases the cost of dedicated testing devices, the utility model provides an airtightness testing device 1 for testing the airtightness of an electric drive assembly housing 2. The electric drive assembly housing 2 is provided with an air inlet 21. The airtightness testing device 1 comprises a housing 11, a tie rod 12, a drive unit 13, a first sealing ring 15, and an air filling passage 14. The housing 11 has a sliding hole 113. The tie rod 12 is mounted in the sliding hole. The drive unit 13 is connected to the tie rod 12 to drive the tie rod 12 to slide along the sliding hole 113. The first sealing ring 15 is provided on the housing 11 to achieve a seal between the housing 11 and the air inlet 21 of the electric drive assembly housing 2. The air filling passage 14 is formed between the housing 11 and the tie rod 12 for filling the interior of the electric drive assembly housing 2 with air. During the specific implementation of the present invention, the pull rod 12 is constructed so that it can extend into the air inlet 21 and form a position with the electric drive assembly housing 2 under the drive of the driving part 13, and after the pull rod 12 and the electric drive assembly housing 2 are positioned, the driving part 13 drives the pull rod 12 to slide relative to the housing 11 in a direction away from the electric drive assembly housing 2, so that the housing 11 and the electric drive assembly housing 2 can be brought closer to each other. After the housing 11 and the electric drive assembly housing 2 gradually approach each other until they abut against each other (the position where the housing 11 and the electric drive assembly housing 2 abut against each other by the pull rod 12 is described as the pull rod 12 being in a sealed position), the first sealing ring 15 provided between the housing 11 and the electric drive assembly housing 2 is sealedly connected to the two respectively, wherein the first sealing ring 15 is sleeved on the periphery of the sliding hole 113, so that a sealed connection can be achieved between the housing 11 and the air inlet 21. The pull rod 12 is also configured to be separated from the housing 2 under the drive of the driving part 13. Specifically, when the driving part 13 drives the pull rod 12 to slide in the direction close to the electric drive assembly housing 2, the contact between the housing 11 and the electric drive assembly housing 2 can be released, so that the pressure between the housing 11 and the electric drive assembly housing 2 will also disappear accordingly, so that the pull rod 12 can be separated from the air inlet 21. Through the above-mentioned setting, when the tester uses the air tightness test device 1 of the utility model to test the air tightness of the electric drive assembly housing, he only needs to pull the first end of the pull rod 12 ( Figure 3 The left end of the middle pull rod) is extended into the air inlet 21 of the electric drive assembly housing 2, and then the pull rod 12 is driven by the driving part 13 to slide in the sliding hole 113 until the housing 11 and the electric drive assembly housing 2 abut against each other, so that the housing 11 forms a sealed connection with the air inlet 21 of the electric drive assembly housing 2 through the first sealing ring 15. In this way, the inspector can connect the external air source with the inflation channel 14 to realize inflation into the electric drive assembly, thereby realizing the air tightness detection of the electric drive assembly.

[0038] Moreover, it can be seen from the above-mentioned air tightness detection process that the present invention does not need to set up other connecting structures 17. It only needs to extend the first end of the pull rod 12 into the air inlet 21 of the electric drive assembly housing 2 and drive the pull rod 12 to slide along the sliding hole 113 through the driving part 13 to achieve a sealed connection between the shell 11 and the electric drive assembly housing 2, so that the air tightness detection device 1 of the present application is more convenient to operate. Moreover, since the size uniformity of the air inlet 21 is relatively high, the air tightness detection device 1 of the present application has a high degree of commonality, thereby reducing the cost of the air tightness detection device 1 of the present application.

[0039] It should be noted that although the above combination Figures 1 to 5 The first sealing ring 15 is described as being arranged on the housing 11 , but this is not restrictive. In the specific implementation of the present invention, the first sealing ring 15 may also be arranged on the electric drive assembly housing 2 , and the first sealing ring 15 is sleeved on the outside of the air inlet 21 .

[0040] As a possible implementation, Figures 1 to 5 As shown, the first end of the pull rod 12 has a connecting structure 17, which can extend into the air inlet of the device to be detected and clamp the inner wall of the housing of the device to be detected to achieve positioning, that is, the connecting structure 17 can extend into the air inlet 21 of the electric drive assembly housing 2 and be positioned and disengaged from the inner wall of the electric drive assembly housing 2. Figure 5As shown, the connection structure 17 at the first end of the pull rod 12 is a "T"-shaped connection portion, and the projection of the end face of the "T"-shaped connection portion away from the shell 11 on the parallel plane is non-circular, so that after the "T"-shaped connection structure extends into the interior of the air inlet 21 and is clamped with the side wall of the electric drive assembly housing 2, the "T"-shaped connection structure can also form a gap with the inner wall of the air inlet 21, so that the gas can enter the interior of the electric drive assembly housing 2 from the inflation channel 14 through the gap. The "T"-shaped connecting portion is arranged to extend gradually backward from the middle to both ends away from the end surface of the shell 11, so that when the pull rod 12 gradually slides toward the direction close to the electric drive assembly shell 2 under the drive of the driving part 13, the connecting structure 17 can be inserted into the air inlet 21 in an inclined manner. After being inserted into the air inlet 21, the pull rod 12 is straightened so that the axis of the pull rod 12 is parallel to the axis of the air inlet 21. At this time, when the driving part 13 drives the pull rod 12 to gradually slide toward the sealing position, the end surface of the "T"-shaped connecting structure 17 close to the shell 11 can hook the inner wall of the electric drive assembly shell 2, and in the process of the driving part 13 continuing to drive the pull rod 12 to slide toward the sealing position, the shell 11 can drive the first sealing ring 15 arranged on the end surface of the shell 11 close to the electric drive assembly shell 2 to press the outer wall of the electric drive assembly shell 2, thereby forming a sealed connection between the shell 11 and the air inlet 21 of the electric drive assembly. With this arrangement, the connection structure 17 at the first end of the pull rod 12 has a simple structure and is easy to process, thereby reducing the number of parts of the airtightness detection device, simplifying the processing steps, and reducing the cost of the airtightness detection device 1 .

[0041] It should be noted that although the above combination Figures 1 to 5The connection structure 17 is described as a "T"-shaped connection portion, and the "T"-shaped connection portion extends gradually backward from the middle to both ends away from the end surface of the housing 11, but this is not restrictive. During the specific implementation of the present invention, the connection structure 17 can also be configured to include an unlocking button (not shown), a connecting rod (not shown), a latch (not shown) and a tension spring (not shown). In this case, a mounting hole (not shown) is provided at the first end of the pull rod 12, and the end of the connecting rod away from the first end of the pull rod 12 is rotatably connected to the mounting hole. The unlocking button is movably connected to the side wall of the mounting hole, and the unlocking button is set in a position where the finger of the inspector can press it when the pull rod 12 gradually slides in the direction close to the electric drive assembly housing 2. At the same time, the unlocking button is connected to the middle of the connecting rod. The latch is provided at the end of the connecting rod close to the electric drive assembly housing 2, and the latch can protrude from the side wall of the pull rod 12 so that the latch can hook the inner wall of the electric drive assembly housing 2. The tension spring is connected to the middle portion of the connecting rod and the inner wall of the mounting hole, ensuring that when the unlock button is not driven, the latching teeth always protrude from the side wall of the pull rod 12, allowing the first end of the pull rod 12 to be locked to the inner wall of the electric drive assembly housing 2. When the unlock button is driven, the latching teeth retract into the inner wall of the pull rod 12, allowing the first end of the pull rod 12 to be withdrawn from the air inlet 21.

[0042] In addition, although the connection structure 17 described above includes an unlocking button, a connecting rod, a latch and a tension spring, this is not restrictive. Without deviating from the basic principles of the present invention, technical personnel in this field can flexibly select the specific setting of the connection structure 17 according to the specific application scenario, as long as it can be achieved that when the electric drive assembly is tested for air tightness, the connection structure 17 at the first end of the pull rod 12 can keep the pull rod 12 connected to the inner wall of the electric drive assembly, and after the air tightness test of the electric drive assembly housing 2 is completed, the connection structure 17 at the first end of the pull rod 12 can enable the pull rod 12 to be pulled out from the air inlet 21.

[0043] As a possible implementation, Figure 1 and Figure 3 As shown, the sliding hole 113 is a through hole. At this time, the second end of the pull rod 12 ( Figure 3 The right end of the middle tie rod 12 extends out of the housing 11, away from the end face of the electric drive assembly housing 2. With this arrangement, when the first end of the tie rod 12 extends into the air inlet 21 and the first sealing ring 15 mounted on the end face of the housing 11 near the electric drive assembly housing 2 presses against the outer wall of the electric drive assembly housing 2 under the action of the drive unit 13, the housing 11 can form a sealed connection with the outer wall of the electric drive assembly housing 2.

[0044] Further, if Figure 1 See also Figure 3 and Figure 4In the specific implementation of the present invention, a second sealing ring 16 is provided between the inner wall of the sliding hole 113 and the side wall of the pull rod 12, so that the inner wall of the sliding hole 113 forms a sealed connection with the side wall of the pull rod 12 through the second sealing ring 16, thereby reducing the risk of gas leakage from the connection between the pull rod 12 and the sliding hole 113.

[0045] Continue reading Figure 1 、 Figure 3 and Figure 4 The driving portion 13 includes a cam 131 and a positioning structure 132. The cam 131 is rotatably connected to the second end of the pull rod 12 so that the cam 131 can drive the pull rod 12 to slide along the slide hole 113 when it rotates. Specifically, a driving handle 133 is fixedly connected to the cam 131, so that the inspector can apply a driving force to the driving handle 133 to drive the cam 131 to rotate. It should be noted that the cam 131 and the second end of the pull rod 12 can be rotatably connected by a pin, and the specific connection method is not repeated here. The positioning structure 132 is provided on the cam 131 so that the cam 131 can be positioned at a preset angle under the action of the positioning structure 132. Furthermore, the positioning structure 132 is a positioning surface provided on the cam 131, so that when the inspector drives the cam 131 to rotate by driving the handle 133 and makes the housing 11 form a sealed connection with the outer wall of the electric drive assembly housing 2 through the first sealing ring 15, the cam 131 is positioned at the current position by the extrusion force between the positioning surface and the rear end face of the housing 11, so that the housing 11 maintains a sealed connection with the outer wall of the electric drive assembly housing 2 through the first sealing ring 15. Through the above-mentioned setting method, the airtightness detection device 1 of the present invention has a simple structure and is easy to operate, thereby reducing costs while also improving detection efficiency, thereby improving user satisfaction.

[0046] It should be noted that although the above combination Figure 1 、 Figure 3 and Figure 4 The positioning structure 132 is described as a positioning surface provided on the cam 131, but this is not restrictive. In the specific implementation of the present invention, the positioning structure 132 can also be a tooth and groove structure (not shown) provided between the cam 131 and the pull rod 12, so that when the housing 11 is sealed with the outer wall of the electric drive assembly housing 2 through the first sealing ring 15, the cam 131 is positioned in a position that enables the housing 11 to remain in a sealed state with the outer wall of the electric drive assembly through the tooth and groove structure. However, this is not restrictive. Without deviating from the basic principles of the present invention, those skilled in the art can flexibly select the specific setting of the positioning structure 132 according to the specific application scenario, as long as the rotation angle of the cam 131 can be positioned.

[0047] In addition, when the cam 131 is positioned at the preset angle, the first end of the pull rod 12 can hook the inner wall of the electric drive assembly housing 2 while also enabling the shell 11 to approach the end face of the electric drive assembly housing to drive the first sealing ring 15 to press the outer wall of the electric drive assembly housing 2, so that the shell 11 maintains a sealed connection with the outer wall of the electric drive assembly housing 2 through the first sealing ring 15.

[0048] In addition, although the above combination Figure 1 、 Figure 3 and Figure 4 The sliding hole 113 is described as a through hole, but this is not restrictive. In other embodiments of the present invention, the sliding hole can also be a blind hole. In this case, the driving part 13 is fixedly connected to the inner wall of the blind hole, and the output end of the driving part 13 is connected to the pull rod 12, so that the pull rod 12 can slide along the sliding hole 113. Specifically, the driving part 13 can be a motor, the housing 11 of the motor is fixedly connected to the inner wall of the blind hole, and a common transmission mechanism such as a gear rack transmission mechanism, a nut screw transmission mechanism or a worm gear is connected between the output end of the motor and the pull rod 12. I will not go into details here, as long as the motor can drive the pull rod 12 to slide along the sliding hole 113 through the transmission mechanism. By adopting the above-mentioned blind hole setting method, the air tightness of the air tightness detection device itself can be relatively improved, thereby reducing the risk of gas leakage when the air tightness detection device 1 performs air tightness detection, thereby ensuring the accuracy of the detection.

[0049] Preferably, in other embodiments of the present invention, the end face of the housing 11 near the electric drive assembly housing 2 has a contact surface that matches the surface contour of the outer wall of the electric drive assembly housing 2, and the sealing ring is connected to the contact surface. By setting it in this way, when the driving part 13 drives the pull rod 12 to slide along the sliding hole 113 to the sealing position, the end face of the housing 11 near the electric drive assembly housing 2 can be automatically positioned while driving the first sealing ring 15 to press the outer wall of the electric drive assembly housing 2, so that the contact surface on the end face of the housing 11 near the electric drive assembly housing 2 and the outer wall of the electric drive assembly housing 2 can be in contact with each other, thereby increasing the airtightness between the contact surface of the housing 11 and the outer wall of the electric drive assembly housing 2. Moreover, it can also enable the connection structure 17 of the first end of the pull rod 12 to be quickly positioned with the outer wall of the electric drive assembly, reducing the risk of the connection structure 17 of the first end of the pull rod 12 being separated from the inner wall of the electric drive assembly, thereby improving the detection efficiency of the inspection personnel.

[0050] It should be noted that, although the end face of the shell 11 close to the electric drive assembly housing 2 described above has a contact surface that matches the surface contour of the outer wall of the electric drive assembly housing 2, so that the end face of the shell 11 close to the electric drive assembly housing 2 is more tightly connected to the outer wall of the electric drive assembly housing 2, this is not restrictive. In other embodiments of the present invention, the end face of the shell 11 close to the electric drive assembly housing 2 can also be set as a conical surface that gradually extends outward from front to back. At this time, the first sealing ring 15 is connected to the conical surface, and the first sealing ring 15 is constructed to be able to cover the entire conical surface. Through this setting, the air tightness detection device 1 can adapt to electric drive assemblies with air inlets 21 of different diameters, as long as the first end of the pull rod 12 can extend into the air inlet 21 and hook the inner wall of the air inlet 21, thereby further improving the versatility or commonality of the air tightness detection device 1.

[0051] In addition, when the air tightness test device 1 with a conical surface is used to test the air tightness of the electric drive assembly, in order to ensure the air tightness of the conical surface and the air inlet 21, a pressure sensor can be set on the conical surface to detect the pressure between the conical surface and the air inlet 21, so that when the tester drives the pull rod 12 to slide to the sealing position through the drive unit 13, the pressure between the conical surface and the air inlet 21 can be monitored at all times. After the pressure between the conical surface and the air inlet 21 reaches a preset pressure threshold, the pull rod 12 is kept in the current position through the positioning structure. At this time, the tester can inflate the electric drive assembly through an external air source to test the air tightness of the electric drive assembly. It should be noted that the preset pressure threshold can be determined by the designer based on experience, experiments, calculations, etc., as long as the pressure between the conical surface and the air inlet 21 can meet the air tightness test requirements.

[0052] As a possible implementation, Figure 1 、 Figure 2 and Figure 3 As shown, the inflation channel 14 includes an inflation port 142 and an air outlet 141 . The inflation port 142 is provided on the outer wall of the shell 11 , and the air outlet 141 is provided on the end face of the shell 11 close to the electric drive assembly housing 2 and is located on the inner side of the first sealing ring 15 .

[0053] It should be noted that, although the inflation port 142 described above is arranged on the outer wall of the shell 11, this is not restrictive. In the specific implementation of the present invention, the inflation port 142 can also be arranged on the pull rod 12. Specifically, when the sliding hole 113 on the shell 11 is a through hole and the second end of the pull rod 12 extends out of the shell 11 away from the end face of the electric drive assembly housing 2, the inflation port 142 can be arranged at the second end of the shell 11 so that the inflation port 142 can be connected to an external air source. At this time, the air outlet 141 can also be arranged at the first end of the pull rod 12. Then, at this time, the inflation channel 14 can be an axial hole opened on the pull rod 12. However, this is not restrictive. In the specific implementation of the present invention, the air outlet 141 can also be arranged on the shell 11 and the pull rod 12 at the same time. For example, the inflation port 142 is a through hole arranged on the shell 11, one end of the through hole is arranged on the outer wall of the shell 11, and the other end of the through hole is arranged on the inner wall of the sliding hole 113. At this time, a first groove is provided on the inner wall of the sliding hole 113, and the first groove extends from the end surface of the shell 11 close to the electric drive assembly housing 2 to the other end of the through hole. A second groove corresponding to the first groove is provided on the outer wall of the pull rod 12, so that when the pull rod 12 is assembled into the interior of the sliding hole 113, the first groove and the second groove can dock with each other to form a channel, and form an air outlet 141 on the end surface of the shell 11 close to the electric drive assembly housing 2. However, this is not restrictive. When the present invention is implemented, the second groove may not be provided on the outer wall of the pull rod 12 to ensure the structural strength of the pull rod 12 itself. At this time, the pull rod 12 can be assembled into the sliding hole 113 to form a channel, so that the gas can be inflated into the air inlet 21 through the through hole and the first groove opened on the shell 11.

[0054] As a possible implementation, Figure 1 、 Figure 3 and Figure 4 As shown, the housing 11 includes a first end cap 111 and a second end cap 112, which are separately connected. This arrangement allows the pull rod 12, the second sealing ring 16, the housing 11, and the drive unit 13 of the present invention to be assembled more easily. Specifically, in the embodiment of the present invention, the sliding hole 113 is a through hole, that is, the sliding hole 113 is a first sliding hole 1131 and a second sliding hole 1132 opened in the first end cap 111 and the second end cap 112.

[0055] Continue reading Figure 1 、 Figure 3 and Figure 4The tie rod 12 is a stepped shaft, comprising, from the first end to the second end, a first shaft 121, a second shaft 122, a third shaft 123, and a fourth shaft 124. The diameters of the first, second, and third shafts 121, 122, and 123 gradually increase. The fourth shaft 124 is smaller than the third shaft 123. The third shaft 123 is dimensioned to provide a clearance fit within the first sliding hole 1131. The second sealing ring 16 is positioned so that when the tie rod 12 is in the assembled position, the sidewall of the third shaft 123 is sealedly connected to the second sealing ring 16, thereby sealingly connecting the third shaft 123 to the first sliding hole 1131 via the second sealing ring 16. Furthermore, the third shaft 123 is positioned so that when the tie rod 12 slides along the sliding hole, the sidewall of the third shaft 123 remains sealedly connected to the inner wall of the first sliding hole 1131 via the second sealing ring 16. The inflation port 142 provided on the housing 11 is positioned corresponding to the second shaft 122.

[0056] Continue reading Figure 1 、 Figure 3 and Figure 4 A limiting plate 19 is provided on the end face of the first end cover 111 close to the second end cover 112, and the limiting plate 19 is connected to the end face of the first end cover 111 close to the second end cover 112 by bolts. The specific connection structure is not repeated here. A through hole that can fit with the fourth shaft 124 in a clearance is provided on the limiting plate 19, and the diameter of the through hole is smaller than the diameter of the third shaft 123. Through such a setting, when the pull rod 12 slides in the direction close to the second end cover 112 inside the shell 11, the limiting plate 19 can abut against the end face of the third shaft 123 close to the second end cover 112 to prevent the third shaft 123 from slipping out of the first end cover 111.

[0057] Continue reading Figure 1 、 Figure 3 and Figure 4 A sleeve 18 is sleeved over the fourth shaft 124. The radial dimensions of the sleeve 18 are configured to slideably engage with the sidewalls of the fourth shaft 124 and the inner wall of the through-hole of the stop plate 19, respectively. Furthermore, the length of the sleeve 18 is configured such that when the pull rod 12 slides along the first sliding hole 1131, the sleeve 18 moves with the pull rod 12 and remains in sliding engagement with the through-hole. This allows the sleeve 18 to support the fourth shaft 124 as the pull rod 12 slides within the first sliding hole 1131, thereby enabling the pull rod 12 to slide stably within the first sliding hole 1131.

[0058] Continue reading Figure 1 、 Figure 3 and Figure 4A sliding groove is also provided on the fourth shaft 124. The sliding groove extends from the end surface of the fourth shaft 124 near the second end cover 112 to the end surface of the third shaft 123 near the second end cover 112. A protrusion corresponding to the sliding groove is provided on the second sliding hole 1132 of the second end cover 112. The protrusion on the second sliding hole 1132 can cooperate with the sliding groove. When the pull rod 12 slides inside the sliding hole 113, the sliding groove and the protrusion prevent the pull rod 12 from rotating.

[0059] Continue reading Figure 1 、 Figure 3 and Figure 4 In other embodiments of the present invention, a gas nozzle 110 may be connected to the inflation port 142 so that it can be quickly connected to an external gas source through the gas nozzle 110, thereby further improving the efficiency of air tightness detection.

[0060] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.

[0061] Thus far, the technical solutions of the present invention have been described in conjunction with the optional embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An airtightness detection device, characterized in that: The air tightness detection device is used to detect the air tightness of the device to be detected, the device to be detected includes a shell, the shell is provided with an air inlet, and the air tightness detection device includes: A housing having a sliding hole; a pull rod assembled in the slide hole; a driving portion connected to the pull rod to drive the pull rod to slide along the sliding hole; a first sealing ring, which is provided at the housing or the outer shell to achieve sealing between the housing and the air inlet, and an air filling channel formed between the housing and the pull rod for filling the device to be detected; The pull rod is configured to extend into the air inlet and form a position with the housing under the drive of the driving portion, and the pull rod is also configured to be separated from the housing under the drive of the driving portion.

2. The airtightness detection device according to claim 1, characterized in that: The first end of the pull rod has a connecting structure, which can extend into the air inlet and clamp the inner wall of the shell of the device to be detected to achieve positioning. The connecting structure can also be separated from the air inlet.

3. The airtightness detection device according to claim 2, characterized in that: The connecting structure is a "T"-shaped connecting portion, and the projection of the end surface of the "T"-shaped connecting portion away from the shell on a parallel plane is non-circular.

4. The airtightness detection device according to claim 1, characterized in that: The sliding hole is a through hole, and the second end of the pull rod can extend out of the housing.

5. The airtightness detection device according to claim 4, characterized in that: A second sealing ring is provided between the sliding hole and the pull rod, and the sliding hole is sealed with the pull rod through the second sealing ring.

6. The airtightness detection device according to claim 5, characterized in that: The driving unit includes: a cam connected to the second end of the pull rod so that the cam can drive the pull rod when rotating; A positioning structure is provided on the cam so that the cam can be positioned at a preset angle under the action of the positioning structure.

7. The airtightness detection device according to claim 6, characterized in that: The positioning structure includes a positioning surface arranged on the cam.

8. The airtightness detection device according to claim 1, characterized in that: The end surface of the first end of the housing contacts the surface of the housing of the device to be detected and the contours thereof match, and the first sealing ring is installed on the end surface of the first end of the housing.

9. The airtightness detection device according to claim 1, characterized in that: The inflation channel includes an inflation port and an air outlet. The inflation port is provided on the housing or the pull rod. The air outlet is provided on the housing and / or the pull rod. The air outlet is located on the inner side of the first sealing ring.

10. The airtightness detection device according to any one of claims 1 to 9, characterized in that: The shell includes a first end cover and a second end cover, and the first end cover is separately connected to the second end cover.

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