Cylinder air tightness detection device

Abstract

The cylinder airtightness detection device comprises a cylinder detection mechanism and a driving mechanism connected with the cylinder detection mechanism. The barrel detection mechanism comprises a shell, a ventilation detection rod, a driving connecting cover, a clamping assembly and a barrel sealing piece, the ventilation detection rod is connected with the shell in a matched mode, one end of the ventilation detection rod extends out of the shell, the other end of the ventilation detection rod abuts against the driving connecting cover, the barrel sealing piece is sleeved with the extending part of the ventilation detection rod, and the outer surface of the barrel sealing piece and the barrel can form sealing; the driving mechanism comprises a driving rod which is connected with the driving connecting cover. According to the utility model, the ventilation detection rod is adopted for ventilation, and the front section of the ventilation detection rod is sleeved with the barrel sealing element, so that the barrel sealing element and the inner wall of the barrel are sealed, the pressure intensity borne by the barrel sealing element can be reduced, and the loss of the sealing element is reduced; a communicated vent hole is formed in the axis of the ventilation detection rod and the axis of the driving rod driving the ventilation detection rod to move, the end of the driving rod serves as an air inlet, and replacement of the ventilation detection rod and a barrel sealing piece can be better facilitated.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing equipment, and more specifically to a cylinder airtightness testing device. Background Technology

[0002] Automobiles have become the most common means of transportation in people's daily lives. Safety and comfort are crucial aspects of automobile use. To improve driving safety and comfort, shock absorbers are used in the automotive suspension system. Shock absorbers mainly consist of two parts: springs and dampers. Within the internal structure of the damper, the reservoir is a vital component. During operation, the reservoir contains oil, and the piston rod drives the piston to move up and down within the reservoir. The oil flows through a valve, thus buffering vibrations during vehicle movement. The inner wall of the reservoir experiences significant pressure; insufficient airtightness will affect the normal operation of the shock absorber. Patent CN214309360U discloses an airtightness testing device for automotive shock absorber reservoirs. This device uses a seal that abuts against the end face of the reservoir body for sealing, and the air inlet is located near the reservoir port, making the seal prone to damage and inconvenient to replace. Therefore, there is an urgent need to design a reservoir airtightness testing device to extend the service life of the seals and improve replacement efficiency. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a cylinder airtightness testing device. This device uses a ventilation testing rod for ventilation, and a cylinder sealing element is fitted onto the front end of the ventilation testing rod, forming a seal between the cylinder sealing element and the inner wall of the cylinder. This reduces the pressure on the cylinder sealing element, decreases its wear, extends its service life, and lowers costs. A connecting ventilation hole is provided at the axis of the ventilation testing rod and the drive rod that drives its movement, with the end of the drive rod serving as the air inlet. This facilitates the replacement of the ventilation testing rod and the cylinder sealing element, improving replacement efficiency.

[0004] The specific technical solution of this utility model is as follows: a cylinder airtightness testing device, including a cylinder testing mechanism and a driving mechanism connected to the cylinder testing mechanism; the cylinder testing mechanism includes a shell, a ventilation testing rod, a driving connection cover, a locking assembly, and a cylinder seal; the ventilation testing rod is connected to the shell and one end extends out of the shell, while the other end abuts against the driving connection cover; the extended part of the ventilation testing rod is fitted with the cylinder seal, and the outer surface of the cylinder seal can form a seal with the cylinder; the driving mechanism includes a driving rod, which is connected to the driving connection cover and can drive the ventilation testing rod to move axially.

[0005] The ventilation detection rod can extend and retract axially under the drive of the drive mechanism. The cylinder seal installed at the extended end of the ventilation detection rod extends into the cylinder and forms a seal with the inner wall of the cylinder. Compared with the end face seal that abuts against the cylinder opening, it can reduce the pressure on the cylinder seal, reduce the wear of the seal, extend the service life, and reduce the cost.

[0006] As a preferred embodiment of this utility model, the ventilation detection rod has a guide cone at one end, and the cylinder sealing element is sleeved on the outside of the ventilation detection rod and installed close to the tail end of the guide cone.

[0007] The guide cone is pre-inserted into the cylinder to provide guidance and allow the cylinder seal to extend more smoothly into the inner wall of the cylinder, reducing wear on the cylinder seal.

[0008] As a preferred embodiment of this utility model, a first vent hole is provided at the axis of the venting detection rod, a second vent hole is provided at the axis of the drive connecting cover, and a third vent hole is provided at the axis of the drive rod, wherein the first vent hole, the second vent hole, and the third vent hole are connected.

[0009] During the airtightness test, the end of the ventilation test rod needs to pressurize the inside of the cylinder. Existing technology usually uses the side opening of the ventilation test rod as the air inlet. This method makes the structure of the ventilation test rod more complicated, increases the manufacturing cost, and is not conducive to disassembly and replacement. Furthermore, the pipe joint installed on the side is prone to loosening and leakage after frequent reciprocating motion. Directly using the end of the drive rod as the air inlet is more conducive to the replacement of the ventilation test rod and is less likely to cause the pipe joint to loosen and leak.

[0010] As a preferred embodiment of this invention, the connection between the ventilation detection rod and the drive connection cover is sealed by a sealing element, and the connection between the drive connection cover and the drive rod is sealed by a sealing element.

[0011] The first vent, the second vent, and the third vent are sealed by the seals between the components to ensure that there is no air leakage.

[0012] As a preferred embodiment of this utility model, the drive mechanism is fixedly connected to the mounting flange via a connecting rod, and the mounting flange has a through hole at a position directly opposite to the axis of the drive rod.

[0013] The end of the drive rod is connected to an air pipe for ventilation, and the mounting flange has a through hole to facilitate the passage of the air pipe.

[0014] As a preferred embodiment of this utility model, the engaging assembly includes an engaging base and an engaging piece. The engaging base and the drive connection cover are fixedly connected. The ventilation detection rod can be installed by passing through the engaging base, and the engaging piece can be inserted into the engaging base to engage the ventilation detection rod.

[0015] By installing the ventilation detection rod into the locking seat, the radial movement of the ventilation detection rod can be restricted, and by installing the locking piece, the axial movement of the ventilation detection rod can be restricted, thereby ensuring the stability of the ventilation detection rod during the testing process and facilitating replacement.

[0016] As a preferred embodiment of this utility model, the ventilation detection rod has an annular engagement groove on the outer circle of the engagement seat, and the engagement piece has an engagement notch that matches the annular engagement groove on the engagement side.

[0017] The engagement opening of the engagement piece matches the bottom radius of the annular engagement groove, enabling the engagement piece to effectively engage with the ventilation detection rod.

[0018] As a preferred embodiment of the present invention, the engaging assembly further includes a fixing rod, which is connected to the tail end into which the engaging piece is inserted, and the fixing rod is detachably connected to the engaging seat.

[0019] The fixing rod and the locking seat can be connected by a thread to facilitate the fixing and disassembly of the locking piece.

[0020] As a preferred embodiment of this invention, the outer diameter of the cylindrical sealing element is larger than the diameter of the large circular end of the guide cone.

[0021] The cylindrical seal needs to be squeezed against the inner wall of the cylinder to achieve a seal. Its diameter is slightly larger than the diameter of the large round end of the guide cone. If the diameter of the cylindrical seal is too small, it will affect the sealing effect. If the diameter is too large, it will make it more difficult to insert into the cylinder and reduce its service life. It is usually designed that the diameter of the cylindrical seal before compression exceeds the diameter of the large round end of the guide cone by 10%-30%.

[0022] As a preferred embodiment of this utility model, a limiting sleeve is also fitted onto the ventilation detection rod, and the limiting sleeve is installed against the cylinder sealing element.

[0023] The limiting sleeve can axially limit the cylinder seal, preventing the cylinder seal from sliding axially under resistance during insertion into the cylinder, or moving axially under air pressure during the detection process, thereby affecting the sealing effect.

[0024] In summary, this utility model has the following beneficial effects:

[0025] This utility model's cylinder airtightness testing device uses a ventilation testing rod for ventilation, and a cylinder sealing component is fitted onto the front section of the ventilation testing rod to form a seal between the cylinder sealing component and the inner wall of the cylinder. This reduces the pressure on the cylinder sealing component, reduces wear on the sealing component, extends its service life, and lowers costs. A ventilation hole is opened at the axis of the ventilation testing rod and the drive rod that drives its movement, with the end of the drive rod serving as the air inlet. This facilitates the replacement of the ventilation testing rod and the cylinder sealing component, improving replacement efficiency. Attached Figure Description

[0026] Figure 1 This is a perspective view of the cylinder airtightness testing device of this utility model;

[0027] Figure 2 This is a cross-sectional view of the airtightness testing device for the cylinder of this utility model in an untested state;

[0028] Figure 3 This is a cross-sectional view of the cylinder airtightness testing device of this utility model under testing conditions;

[0029] Figure 4 This is a schematic diagram of the engagement state of the engagement component of the cylinder airtightness testing device of this utility model with respect to the ventilation detection rod;

[0030] In the figure, 1-cylinder detection mechanism, 11-shell, 12-ventilation detection rod, 121-guide cone, 122-first vent, 123-annular locking groove, 13-drive connection cover, 131-second vent, 14-locking assembly, 141-locking seat, 142-locking piece, 143-fixing rod, 15-cylinder seal, 16-limiting sleeve, 2-drive mechanism, 21-drive rod, 211-third vent, 3-mounting flange, 31-through hole. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 , Figure 2 , Figure 3 The cylinder airtightness testing device includes a cylinder testing mechanism 1 and a drive mechanism 2 connected to the cylinder testing mechanism 1. The cylinder testing mechanism 1 includes a housing 11, a ventilation testing rod 12, a drive connection cover 13, a locking assembly 14, and a cylinder seal 15. The ventilation testing rod 12 is connected to the housing 11 and one end extends out of the housing 11, while the other end abuts against the drive connection cover 13. The extended part of the ventilation testing rod 12 is fitted with the cylinder seal 15, and the outer surface of the cylinder seal 15 can form a seal with the cylinder. The drive mechanism 2 includes a drive rod 21, which is connected to the drive connection cover 13 and can drive the ventilation testing rod 12 to move axially.

[0033] Under the drive of the drive mechanism 2, the ventilation detection rod 12 can move axially. The cylinder seal 15 installed at the extended end of the ventilation detection rod 12 extends into the cylinder and forms a seal with the inner wall of the cylinder. Compared with the end face seal that abuts against the cylinder opening, it can reduce the pressure on the cylinder seal 15, reduce the wear of the seal, extend the service life, and reduce the cost.

[0034] like Figure 1 , Figure 2 , Figure 3 The ventilation detection rod 12 has a guide cone 121 extending from one end, and the cylinder seal 15 is sleeved on the outside of the ventilation detection rod 12 and installed close to the tail end of the guide cone 121.

[0035] The guide cone 121 is pre-inserted into the cylinder to serve as a guide and to allow the cylinder seal 15 to extend more smoothly into the inner wall of the cylinder, thereby reducing the wear of the cylinder seal 15.

[0036] like Figure 2 , Figure 3 The ventilation detection rod 12 has a first ventilation hole 122 at its axis, the drive connecting cover 13 has a second ventilation hole 131 at its axis, and the drive rod 21 has a third ventilation hole 211 at its axis. The first ventilation hole 122, the second ventilation hole 131 and the third ventilation hole 211 are connected.

[0037] During the air tightness test, the end of the ventilation test rod 12 needs to pressurize the inside of the cylinder. Existing technology usually uses the side opening of the ventilation test rod 12 as the air inlet. This method makes the structure of the ventilation test rod 12 more complicated, increases the manufacturing cost, and is not conducive to disassembly and replacement. In addition, the pipe joint installed on the side is prone to loosening and leakage after frequent reciprocating motion. Directly using the end of the drive rod 21 as the air inlet is more conducive to the replacement of the ventilation test rod 12 and is less likely to cause the pipe joint to loosen and leak.

[0038] like Figure 2 , Figure 3 The connection between the ventilation detection rod 12 and the drive connection cover 13 is sealed by a sealant, and the connection between the drive connection cover 13 and the drive rod 21 is sealed by a sealant.

[0039] The first vent 122, the second vent 131, and the third vent 211 are sealed by the seals between the components to ensure that there is no air leakage.

[0040] like Figure 1 , Figure 2 , Figure 3 The drive mechanism 2 is fixedly connected to the mounting flange 3 via a connecting rod. The mounting flange 3 has a through hole 31 at a position directly opposite to the axis of the drive rod 21.

[0041] The end of the drive rod 21 is connected to an air pipe for ventilation, and the mounting flange 3 has a through hole 31 to facilitate the passage of the air pipe.

[0042] like Figure 2 , Figure 3 , Figure 4 The locking assembly 14 includes a locking seat 141 and a locking piece 142. The locking seat 141 is fixedly connected to the drive connection cover 13. The ventilation detection rod 12 can be installed by passing through the locking seat 141. The locking piece 142 can be inserted into the locking seat 141 to lock the ventilation detection rod 12.

[0043] By installing the ventilation detection rod 12 into the locking seat 141, the degree of freedom of radial movement of the ventilation detection rod 12 can be restricted. By installing the locking piece 142, the degree of freedom of axial movement of the ventilation detection rod 12 can be restricted, thereby ensuring the stability of the ventilation detection rod 12 during the testing process and facilitating its replacement.

[0044] like Figure 2 , Figure 3 The ventilation detection rod 12 has an annular engagement groove 123 on the outer circle inside the engagement seat 141, and the engagement piece 142 has an engagement notch that matches the annular engagement groove 123 on the engagement side.

[0045] The engagement opening of the locking piece 142 and the bottom radius of the annular engagement groove 123 are matched, so that the locking piece 142 can effectively engage with the ventilation detection rod 12.

[0046] like Figure 2 , Figure 3 , Figure 4 The engaging assembly 14 also includes a fixing rod 143, which is connected to the end of the engaging piece 142 that is inserted, and the fixing rod 143 is detachably connected to the engaging seat 141.

[0047] The fixing rod 143 and the locking seat 141 can be connected by threads to facilitate the fixing and disassembly of the locking piece 142.

[0048] like Figure 1 , Figure 2 , Figure 3 The outer diameter of the cylindrical seal 15 is greater than the diameter of the large round end of the guide cone 121.

[0049] The cylinder seal 15 needs to be squeezed against the inner wall of the cylinder to achieve a seal. Its diameter is slightly larger than the diameter of the large round end of the guide cone 121. If the diameter of the cylinder seal 15 is too small, it will affect the sealing effect. If the diameter is too large, it will make it more difficult to insert into the cylinder and reduce its service life. It is usually designed that the diameter of the cylinder seal 15 before compression exceeds the diameter of the large round end of the guide cone 121 by 10%-30%.

[0050] like Figure 1 , Figure 2 , Figure 3 A limiting sleeve 16 is also fitted on the ventilation detection rod 12, and the limiting sleeve 16 is installed against the cylinder seal 15.

[0051] The limiting sleeve 16 can axially limit the cylinder seal 15, preventing the cylinder seal 15 from sliding axially under resistance during insertion into the cylinder, or moving axially under air pressure during the testing process, thereby affecting the sealing effect.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A cylinder airtightness testing device, characterized in that: The device includes a cylinder detection mechanism (1) and a drive mechanism (2) connected to the cylinder detection mechanism (1). The cylinder detection mechanism (1) includes a housing (11), a ventilation detection rod (12), a drive connection cover (13), a locking assembly (14), and a cylinder seal (15). The ventilation detection rod (12) is connected to the housing (11) and one end extends out of the housing (11), while the other end abuts against the drive connection cover (13). The extended part of the ventilation detection rod (12) is fitted with the cylinder seal (15), and the outer surface of the cylinder seal (15) can form a seal with the cylinder. The drive mechanism (2) includes a drive rod (21), which is connected to the drive connection cover (13) and can drive the ventilation detection rod (12) to move axially.

2. The cylinder airtightness testing device according to claim 1, characterized in that: The ventilation detection rod (12) has a guide cone (121) at one end, and the cylinder seal (15) is sleeved on the outside of the ventilation detection rod (12) and installed close to the tail end of the guide cone (121).

3. The cylinder airtightness testing device according to claim 1, characterized in that: The ventilation detection rod (12) has a first ventilation hole (122) at its axis, the drive connecting cover (13) has a second ventilation hole (131) at its axis, and the drive rod (21) has a third ventilation hole (211) at its axis. The first ventilation hole (122), the second ventilation hole (131) and the third ventilation hole (211) are connected.

4. The cylinder airtightness testing device according to claim 3, characterized in that: The connection between the ventilation detection rod (12) and the drive connection cover (13) is sealed by a sealing element, and the connection between the drive connection cover (13) and the drive rod (21) is sealed by a sealing element.

5. The cylinder airtightness testing device according to claim 3, characterized in that: The drive mechanism (2) is fixedly connected to the mounting flange (3) by a connecting rod. The mounting flange (3) has a through hole (31) at a position directly opposite to the axis of the drive rod (21).

6. The cylinder airtightness testing device according to claim 1, characterized in that: The engaging assembly (14) includes an engaging seat (141) and an engaging piece (142). The engaging seat (141) and the drive connection cover (13) are fixedly connected. The ventilation detection rod (12) can be installed through the engaging seat (141). The engaging piece (142) can be inserted into the engaging seat (141) to engage the ventilation detection rod (12).

7. The cylinder airtightness testing device according to claim 6, characterized in that: The ventilation detection rod (12) has an annular engagement groove (123) on the outer circle inside the engagement seat (141), and the engagement piece (142) has an engagement notch that matches the annular engagement groove (123) on the engagement side.

8. The cylinder airtightness testing device according to claim 6, characterized in that: The engaging assembly (14) further includes a fixing rod (143), which is connected to the end of the engaging piece (142) that is inserted, and the fixing rod (143) is detachably connected to the engaging seat (141).

9. The cylinder airtightness testing device according to claim 2, characterized in that: The outer diameter of the cylindrical seal (15) is larger than the diameter of the large circle end of the guide cone (121).

10. The cylinder airtightness testing device according to claim 1, characterized in that: A limiting sleeve (16) is also fitted on the ventilation detection rod (12), and the limiting sleeve (16) is installed against the cylinder seal (15).

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