Pipe joint locking device and high-pressure pipe airtightness detector

Abstract

The present invention discloses a pipe joint locking device, which can provide reliable clamping for the pipe joint and sufficient sealing to ensure the normal progress of the detection of high-pressure pipes. In addition, the present invention also provides a high-pressure pipe airtightness detector. The pipe joint locking device of the present invention includes a locking joint, a mounting seat and a driving device. The locking joint includes a mounting pipe, a fixed pipe, a sliding pipe, a driven member, a first sealing member and a second sealing member. The two ends of the mounting pipe respectively form a connection end and a mounting end. The fixed pipe is sleeved outside the connection end, and the first sealing member is arranged inside the fixed pipe. The sliding pipe is sleeved outside the fixed pipe, and the driven member and the second sealing member are arranged inside the sliding pipe. The driven member, the second sealing member and the fixed pipe jointly enclose a plugging channel for inserting the pipe joint. An air flow channel is arranged inside the mounting pipe, and the plugging channel is communicated with the air flow channel. The mounting end is mounted on the mounting seat, and the driving device is mounted on the mounting seat. The output end of the driving device is connected to the sliding pipe.

Description

Technical Field

[0001] The present invention relates to the field of airtightness detection of high-pressure pipes, and particularly to a pipe joint locking device and a high-pressure pipe airtightness detector. Background Art

[0002] In industrial production, lubrication treatment for high-speed precision mechanical equipment is very important. An oil-gas distributor can supply lubricating oil to lubrication points accurately, controllably, stably, and quantitatively. It mixes lubricating oil and compressed air to generate an oil film, and through the flow of compressed air, transports the lubricating oil along the inner wall of the high-pressure pipe to the lubrication points. When in use, the high-pressure pipe needs to be kept sealed to prevent the medium inside the high-pressure pipe from leaking. If leakage occurs, it will lead to lubrication failure and even cause safety accidents. Therefore, before leaving the factory or before use, the high-pressure pipe is usually subjected to airtightness detection. During the detection, the pipe joints at both ends of the high-pressure pipe are connected to the pipe joint locking device of the detector, and after being locked by the pipe joint locking device, the detection is carried out. However, the current pipe joint locking device is not very reliable in locking the pipe joint, and there may be a situation of seal failure.

[0003] Therefore, there is an urgent need to provide a pipe joint locking device and a high-pressure pipe airtightness detector that can provide reliable clamping and sufficient sealing to overcome the above defects. Summary of the Invention

[0004] The purpose of the present invention is to provide a pipe joint locking device that can provide reliable clamping and sufficient sealing.

[0005] Another purpose of the present invention is to provide a high-pressure pipe airtightness detector that can provide reliable clamping and sufficient sealing.

[0006] To achieve the above object, the present invention provides a pipe joint locking device, which is suitable for locking an inserted pipe joint and includes a locking joint, a mounting seat and a driving device. The locking joint includes a mounting pipe, a fixed pipe, a sliding pipe, a driven member, a first seal and a second seal. The first end of the mounting pipe forms a connection end and the second end forms a mounting end that is exposed backward. The fixed pipe is sleeved outside the connection end, and the front end of the fixed pipe protrudes forward beyond the connection end. The first seal is arranged inside the fixed pipe. The sliding pipe is sleeved outside the fixed pipe, and the sliding pipe can slide along the central axis of the pipe joint locking device. The driven member and the second seal are arranged inside the sliding pipe. The driven member, the second seal and the fixed pipe are arranged in sequence from front to back and the three jointly enclose an insertion channel for inserting the pipe joint. An air flow channel is arranged inside the mounting pipe, and the insertion channel is communicated with the air flow channel. At least part of the structure of the front end face of the first seal is arranged facing the insertion channel. The mounting end is mounted on the mounting seat, and the driving device is mounted on the mounting seat. The output end of the driving device is connected to the sliding pipe, and the driving device drives the sliding pipe to slide and drives the driven member to slide along the central axis of the pipe joint locking device, so that the driven member squeezes the second seal to expand and deform, thereby clamping the pipe joint inserted into the insertion channel with the second seal.

[0007] Preferably, the diameter of the end of the connection end becomes smaller to form an air outlet pipe structure, the air outlet pipe structure is arranged facing the insertion channel, and the first seal is sleeved outside the air outlet pipe structure.

[0008] Preferably, a limiting protrusion is formed inside the fixed pipe, and an installation cavity is enclosed between the limiting protrusion and the connection end, and the first seal is arranged in the installation cavity.

[0009] Preferably, the second seal includes a clamping structure arranged in a tubular shape and a pushing structure extending radially at the front end of the clamping structure and arranged in a ring shape. The clamping structure is sleeved inside the fixed pipe, and the pushing structure is arranged outside the fixed pipe and is arranged facing the driven member.

[0010] Preferably, a third seal is further arranged between the clamping structure and the limiting protrusion.

[0011] Preferably, the driven member includes a pipe head structure arranged in a tubular shape and a pushing structure extending radially at the rear end of the pipe head structure and arranged in a ring shape. The pushing structure is arranged facing the pushing structure.

[0012] Preferably, the locking joint further includes an elastic member. The end of the front end of the sliding pipe forms a closed-end ring piece. The pipe head structure is arranged in the space enclosed by the closed-end ring piece. An action cavity is enclosed between the closed-end ring piece and the pushing structure, and the elastic member is arranged in the action cavity. The elastic member always has a tendency to drive the pushing structure away from the closed-end ring piece.

[0013] Preferably, the locking joint further includes a fourth seal. An installation ring groove is formed in the side wall of the connection end, the fourth seal is arranged in the installation ring groove, and the fixed pipe and the connection end are fixed to each other by threaded connection or snap connection.

[0014] Preferably, the driving device includes a driver, a first connecting rod and a second connecting rod. The mounting seat is bent at a right angle. The locking joint is installed at the first end of the mounting seat. An air delivery channel is provided in the mounting seat. The air delivery pipe is communicated with the air flow channel. The driver is hinged to the second end of the mounting seat. The driver is arranged obliquely on the mounting seat. The first end of the first connecting rod is hinged to the output end of the driver. The first end of the second connecting rod is hinged to the second end of the first connecting rod. The second end of the second connecting rod is hinged to the sliding pipe. The driver drives the sliding of the sliding pipe through the first connecting rod and the second connecting rod.

[0015] To achieve the second above-mentioned purpose, the present invention also provides a high-pressure pipe airtightness detector, which is suitable for performing airtightness tests on a pipeline to be tested with pipe joints installed at both ends. It includes a gas source, a solenoid valve, a pressure detection device, a control device and at least one pair of pipe joint locking devices arranged as described above, which are connected in sequence. The pipe joints at both ends are respectively inserted into the insertion channels of each pair of pipe joint locking devices and clamped and sealed. Each pair of pipe joint locking devices and the inner cavity of the pipeline to be tested form a to-be-tested sealed cavity. The control device is communicated with the to-be-tested sealed cavity. The solenoid valve selects to open or cut off the conduction between the gas source and the to-be-tested sealed cavity. The control device controls the solenoid valve to switch to the open state or the cut-off state according to the air pressure detected by the pressure detection device.

[0016] In the pipe joint locking device provided by the present invention, after the pipe joint is inserted into the insertion channel in place, the end of the pipe joint abuts against the first sealing member. The first sealing member provides end face sealing for the pipe joint. The driven member squeezes the second sealing member to expand and deform, so that the second sealing member clamps the pipe joint inserted into the insertion channel, thereby realizing the positioning of the pipe joint and realizing the side sealing of the pipe joint, so as to realize double sealing (i.e., end face sealing + side sealing) and positioning, improve the reliability of locking the pipe joint, and improve the sealing performance of the pipe joint.

[0017] It can be understood that since the high-pressure pipe airtightness detector of the present invention includes the above-mentioned pipe joint locking device, it can reliably clamp the pipe joint during detection, and can also strengthen the sealing of the pipe joint, ensuring the normal progress of the high-pressure pipe airtightness detection. Description of the Drawings

[0018] Figure 1 is a perspective view of the pipe joint locking device of the present invention.

[0019] Figure 2 is a top view of the pipe joint locking device of the present invention.

[0020] Figure 3 is a perspective view after the locking joint of the present invention is assembled with the first connecting rod and the second connecting rod and the pipe joint is inserted into the insertion channel.

[0021] Figure 4 is Figure 3 a rotating sectional view of the structure shown in

[0022] Figure 5 a schematic structural view of the high-pressure pipe airtightness detection machine of the present invention. Specific Embodiments

[0023] In order to describe in detail the technical content and structural features of the present invention, the following further description will be made in conjunction with the embodiments and with reference to the drawings.

[0024] As Figures 1 to 4 shown, the present invention provides a pipe joint locking device 100, which is suitable for locking an inserted pipe joint 200 to achieve reliable locking of the pipe joint 200 and provide sufficient sealing to ensure the normal progress of the airtightness detection of the high-pressure pipe.

[0025] Specifically, the pipe joint locking device 100 of the present invention includes a locking joint 10, a mounting seat 20, and a driving device 30. The locking joint 10 includes a mounting pipe 11, a fixed pipe 12, a sliding pipe 13, a driven member 14, a first seal 15, and a second seal 16. The first end of the mounting pipe 11 forms a connection end 111 and the second end forms a mounting end 112 that is exposed backward. The fixed pipe 12 is sleeved outside the connection end 111, and the front end of the fixed pipe 12 extends forward beyond the connection end 111. The first seal 15 is disposed inside the fixed pipe 12. The sliding pipe 13 is sleeved outside the fixed pipe 12, and the sliding pipe 13 can slide along the central axis A of the pipe joint locking device 100. The driven member 14 and the second seal 16 are disposed inside the sliding pipe 13. The driven member 14, the second seal 16, and the fixed pipe 12 are arranged in sequence from front to back and the three jointly enclose a plugging channel 17 for inserting the pipe joint 200. An air flow channel 113 is provided inside the mounting pipe 11, and the plugging channel 17 is communicated with the air flow channel 113. At least part of the structure of the front end face of the first seal 15 is arranged facing the plugging channel 17. The mounting end 112 is mounted on the mounting seat 20, the driving device 30 is mounted on the mounting seat 20, and the output end of the driving device 30 is connected to the sliding pipe 13. The driving device 30 drives the sliding of the sliding pipe 13 to drive the driven member 14 to slide along the central axis A of the pipe joint locking device 100, so that the driven member 14 squeezes the second seal 16 to expand and deform, thereby clamping the pipe joint 200 inserted into the plugging channel 17 by the second seal 16.

[0026] In the pipe joint locking device 100 provided by the present invention, after the pipe joint 200 is inserted into the insertion channel 17 in place, the end of the pipe joint 200 abuts against the first seal 15, and the first seal 15 provides end face sealing for the pipe joint 200. The driven member 14 squeezes the second seal 16 to expand and deform, so that the second seal 16 clamps the pipe joint 200 inserted into the insertion channel 17, thereby realizing the positioning of the pipe joint 200 and realizing the side sealing of the pipe joint 200, so as to achieve double sealing (i.e., end face sealing + side sealing) and positioning, improve the reliability of locking the pipe joint 200, and improve the sealing performance of the pipe joint 200.

[0027] The pipe joint 200 is a part of the high-pressure pipe 210. The high-pressure pipe 210 further includes a pipeline to be tested 220. Pipe joints 200 are installed at both ends of the pipeline to be tested 220. The pipeline to be tested 220 is a rubber hose, but is not limited thereto.

[0028] The pipe joint locking device 100 of the present invention can be applied to a high-pressure pipe airtightness detector 1000, such as Figure 5 As shown, the high-pressure pipe airtightness detector 1000 includes a gas source 300, a solenoid valve 400, a pressure detection device 500, a control device 600, and at least one pair of the above-mentioned pipe joint locking devices 100 connected in sequence. For the convenience of description, only one group of pipe joint locking devices 100 is shown in the present invention, but it should be understood that the number of pipe joint locking devices 100 can be more than one group. The pipe joints 200 at both ends are respectively inserted into the insertion channels 17 of each pair of pipe joint locking devices 100 and clamped and sealed. Each pair of pipe joint locking devices 100 and the inner cavity of the pipeline to be tested 220 form a to-be-tested sealed cavity. The control device 600 is communicated with the to-be-tested sealed cavity. The solenoid valve 400 selects to open or cut off the conduction between the gas source 300 and the to-be-tested sealed cavity. The control device 600 controls the solenoid valve 400 to switch to the open state or the cut-off state according to the air pressure detected by the pressure detection device 500.

[0029] Among them, the pressure detection device 500 is selected as an electronic barometer, and of course, a mechanical barometer can also be selected. The control device 600 is a device with a control logic circuit, such as an industrial computer, etc. The gas source 300 is the high-pressure gas in the gas pipeline in the factory, and of course, an air pump can also be configured. The solenoid valve 400 can be selected as an existing structure.

[0030] As Figure 4As shown, the diameter of the end of the connection end 111 becomes smaller to form an air outlet pipe structure 1111. The air outlet pipe structure 1111 is arranged facing the insertion channel 17. The first seal 15 is sleeved on the air outlet pipe structure 1111, so that a part of the structure on the front end face of the first seal 15 sleeved on the air outlet pipe structure 1111 can face the insertion channel 17 for the inserted pipe joint 200 to abut. Preferably, the first seal 15 is a ring structure.

[0031] As Figure 4 shown, a limiting protrusion 121 is formed in the fixed pipe 12. An installation cavity 122 is defined between the limiting protrusion 121 and the connection end 111. The first seal 15 is arranged in the installation cavity 122. The limiting protrusion 121 provides limitation for the first seal 15, so that the first seal 15 is stably installed in the installation cavity 122.

[0032] As Figure 4 shown, the second seal 16 includes a clamping structure 161 arranged in a tubular shape and a pushing structure 162 extending radially at the front end of the clamping structure 161 and arranged in a ring shape. The clamping structure 161 is sleeved in the fixed pipe 12, and the pushing structure 162 is arranged outside the fixed pipe 12 and is arranged facing the driven member 14. When the second seal 16 expands and deforms, the clamping structure 161 will hold the pipe joint 200 located in the insertion channel 17 tightly, providing reliable positioning and sufficient sealing for the pipe joint 200. And the pushing structure 162 arranged in a ring shape has a large force-bearing area, which is convenient for driving the second seal 16 to expand and deform. To further enhance the sealing effect, a third seal 163 is also arranged between the clamping structure 161 and the limiting protrusion 121. It should be noted that the width of the third seal 163 is much smaller than the width of the clamping structure 161, but this is not limited thereto.

[0033] As Figure 4 shown, the driven member 14 includes a pipe head structure 141 arranged in a tubular shape and a pushing structure 142 extending radially at the rear end of the pipe head structure 141 and arranged in a ring shape. The pushing structure 142 is opposite to the pushing structure 162 to facilitate the pushing structure 142 to push the pushing structure 162 to make the second seal 16 be squeezed and expand and deform. It should be noted that the pipe joint 200 inserted into the insertion channel 17 is coaxially arranged with the pipe joint locking device 100. When the driven member 14 slides, it generally slides along the side wall of the pipe joint 200.

[0034] As Figure 3 and Figure 4As shown, the locking joint 10 further includes an elastic member 18, a closing ring piece 131 is formed at the end of the front end of the sliding tube 13, and the tube head structure 141 is arranged in the space surrounded by the closing ring piece 131. An action cavity 132 is surrounded between the closing ring piece 131 and the push structure 142. The elastic member 18 is arranged in the action cavity 132, and the elastic member 18 always has a tendency to drive the push structure 142 away from the closing ring piece 131. When the driving device 30 drives the sliding tube 13 to slide, the closing ring piece 131 approaches the push structure 142, and the elastic member 18 is compressed at this time, thereby linking the driven member 14 to slide. When the driving device 30 is reset, the elastic member 18 opens and drives the closing ring piece 131 and the push structure 142 to move relatively away from each other to achieve reset. At this time, the elastic member 18 will slightly press the first sealing member 15, producing a pre-tightening effect, and also limiting the first sealing member 15 from coming out. After the sliding tube 13 and the driven member 14 are reset, the second sealing member 16 returns to its original state. It is worth noting that the deformation amount of the second sealing member 16 is small each time, but the change of the deformation amount is sufficient to generate a large clamping force, effectively clamp the pipe joint 200, and provide a sufficiently tight seal. Preferably, in the embodiment provided by the present invention, the elastic member 18 is a V-shaped spring, but according to actual needs, an ordinary spring can also be selected.

[0035] like Figure 4 As shown, the locking joint 10 further includes a fourth seal 19, and the outer side wall of the connecting end 111 is further provided with an installation annular groove 1112, and the fourth seal 19 is arranged in the installation annular groove 1112, and the fourth seal 19 is arranged to further strengthen the sealing of the locking joint 10. The fixing tube 12 and the connecting end 111 are fixed to each other by threaded connection, and of course, according to actual application requirements, the fixing tube 12 and the connecting end 111 can also be fixed to each other by a snap connection.

[0036] like Figures 1 to 4As shown, the driving device 30 includes a driver 31, a first connecting rod 32, and a second connecting rod 33. The mounting base 20 is bent at a right angle. The locking joint 10 is installed at the first end of the mounting base 20. An air delivery channel (not marked in the figure) is provided in the mounting base 20, and the air delivery channel communicates with the air flow channel 113. The control device 600 communicates with the air delivery channel. The driver 31 is hinged to the second end of the mounting base 20. The driver 31 is arranged obliquely on the mounting base 20. The first end of the first connecting rod 32 is hinged to the output end of the driver 31. The first end of the second connecting rod 33 is hinged to the second end of the second connecting rod 33. The second end of the second connecting rod 33 is hinged to the sliding tube 13. The driver 31 drives the sliding of the sliding tube 13 by means of the first connecting rod 32 and the second connecting rod 33. It is convenient to drive the sliding of the sliding tube 13 by means of the driver 31, the first connecting rod 32, and the second connecting rod 33. It should be noted that the stroke of each sliding of the sliding tube 13 is very short, and the first connecting rod 32 and the second connecting rod 33 help to achieve the short-stroke sliding of the sliding tube 13. After driving the sliding of the sliding tube 13, the first connecting rod 32 also "locks" on the sliding tube 13.

[0037] The working process of the pipe joint locking device 100 of the present invention is briefly described as follows: Insert the pipe joint 200 into the insertion channel 17 so that the end of the pipe joint 200 abuts against the first seal 15. The driver 31 drives the sliding of the sliding tube 13 by means of the first connecting rod 32 and the second connecting rod 33. The closing ring piece 131 slides backward and approaches the pushing structure 142, so that the driven member 14 slides backward and the elastic member 18 is compressed. The pushing structure 142 pushes the matching pushing structure 162, squeezing the second seal 16 to expand and deform. The second seal 16 clamps the pipe joint 200 inserted into the insertion channel 17 to achieve the sealing of the end face and side face of the pipe joint 200. The solenoid valve 400 is opened to supply air from the air source 300 to the airtight cavity to be measured. When the pressure detection device 500 detects that the air pressure in the airtight cavity to be measured reaches the preset value, the control device 600 controls the solenoid valve 400 to close for air injection and pressure holding. Within the preset time range, if the pressure in the airtight cavity to be measured remains unchanged, or the pressure drop in the airtight cavity to be measured is within the specified range, it is determined that the airtightness of the high-pressure pipe 210 is qualified; otherwise, it is determined to be unqualified. After the detection, the driver 31 drives the first connecting rod 32 and the second connecting rod 33 to reset. The elastic member 18 returns to its original state. The opening of the elastic member 18 drives the closing ring piece 131 and the pushing structure 142 to move away from each other, realizing the reset of the driven member 14. The second seal 16 returns to its original state, and the second seal 16 relaxes the clamping of the pipe joint 200. Just pull out the pipe joint 200, and the high-pressure pipe 210 can be sorted according to the detection results.

[0038] It should be noted that Figure 3 and Figure 4 in, the direction indicated by the arrow Y is the direction from back to front.

[0039] The above-disclosed are only the preferred examples of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention all fall within the scope covered by the present invention.

Claims

1. A pipe joint locking device, suitable for clamping and sealing an inserted pipe joint, characterized in that: The invention comprises a locking joint, a mounting seat and a driving device, wherein the locking joint comprises a mounting tube, a fixed tube, a sliding tube, a driven part, a first sealing part and a second sealing part, wherein the first end of the mounting tube forms a connecting end and the second end forms a mounting end exposed backward, the fixed tube is sleeved on the connecting end, and the front end of the fixed tube extends forwardly beyond the connecting end, the first sealing part is arranged in the fixed tube, the sliding tube is sleeved on the fixed tube, and the sliding tube can slide along the central axis of the pipe joint locking device, the driven part and the second sealing part are arranged in the sliding tube, the driven part, the second sealing part and the fixed tube are arranged in sequence from front to back and the three together enclose a plug-in channel for plug-in of the pipe joint, an air flow channel is arranged in the mounting tube, the plug-in channel is communicated with the air flow channel, and the first At least part of the structure of the front end surface of the sealing member is arranged facing the plug-in channel, the mounting end is mounted on the mounting seat, the driving device is mounted on the mounting seat, and the output end of the driving device is connected to the sliding tube, and the driving device drives the sliding of the sliding tube to link the driven member to slide along the central axis of the pipe joint locking device, so that the driven member squeezes the second sealing member to expand and deform, thereby clamping the pipe joint inserted into the plug-in channel; the tube diameter of the end of the connecting end becomes smaller to form an air outlet pipe structure, the air outlet pipe structure is arranged facing the plug-in channel, and the first sealing member is sheathed on the air outlet pipe structure; a limiting protrusion is formed in the fixed tube, and an installation cavity is enclosed between the limiting protrusion and the connecting end, and the first sealing member is arranged in the installation cavity.

2. The pipe joint locking device according to claim 1, characterized in that: The second sealing member includes a clamping structure arranged in a tubular shape and a matching push structure extending radially at the front end of the clamping structure and arranged in an annular shape, the clamping structure is sleeved in the fixed tube, and the matching push structure is arranged outside the fixed tube and facing the driven member.

3. The pipe joint locking device according to claim 2, characterized in that: A third sealing member is also provided between the clamping structure and the limiting protrusion.

4. The pipe joint locking device according to claim 2, characterized in that: The driven component comprises a tube head structure arranged in a tubular shape and a push structure extending radially at the rear end of the tube head structure and arranged in a ring shape, wherein the push structure is directly opposite to the matching push structure.

5. The pipe joint locking device according to claim 4, characterized in that: The locking joint also includes an elastic member, and the end of the front end of the sliding tube forms a closing ring piece. The tube head structure is arranged in the space surrounded by the closing ring piece, and an action cavity is surrounded by the closing ring piece and the pushing structure. The elastic member is arranged in the action cavity, and the elastic member always has a tendency to drive the pushing structure away from the closing ring piece.

6. The pipe joint locking device according to claim 1, characterized in that: The locking joint also includes a fourth sealing member, a side wall of the connecting end is provided with a mounting ring groove, the fourth sealing member is arranged in the mounting ring groove, and the fixing tube and the connecting end are fixed to each other by a threaded connection or a snap connection.

7. The pipe joint locking device according to claim 1, characterized in that: The driving device includes a driver, a first connecting rod and a second connecting rod. The mounting seat is bent at a right angle. The locking joint is installed at the first end of the mounting seat. An air delivery channel is provided in the mounting seat, and the air delivery channel is communicated with the air flow channel. The driver is hinged to the second end of the mounting seat. The driver is arranged obliquely on the mounting seat. The first end of the first connecting rod is hinged to the output end of the driver, the first end of the second connecting rod is hinged to the second end of the first connecting rod, and the second end of the second connecting rod is hinged to the sliding tube. The driver drives the sliding tube to slide by means of the first connecting rod and the second connecting rod.

8. A high-pressure pipe air tightness tester, suitable for testing the air tightness of a pipe to be tested with pipe joints installed at both ends, characterized in that: It comprises an air source, a solenoid valve, a pressure detection device, a control device and at least one group of pipe joint locking devices as described in any one of claims 1 to 7 which are connected in sequence, the pipe joints at both ends are respectively inserted into the plug-in channels of each pair of the pipe joint locking devices and clamped and sealed, each pair of the pipe joint locking devices and the inner cavity of the pipe to be tested form a sealed cavity to be tested, the control device is connected to the sealed cavity to be tested, the solenoid valve selects to open or cut off the conduction between the air source and the closed cavity to be tested, and the control device controls the solenoid valve to switch to an open state or a cut-off state according to the air pressure detected by the pressure detection device.

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