CN218973752U

CN218973752U - Air tightness detection device

Info

Publication number: CN218973752U
Application number: CN202223554784.1U
Authority: CN
Inventors: 冉志刚; 张超
Original assignee: CHONGQING BAIJISIXING PRESSURE CASTING CO LTD
Current assignee: CHONGQING BAIJISIXING PRESSURE CASTING CO LTD
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-05
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to the technical field of air tightness detection, and particularly discloses an air tightness detection device which comprises a rack, an air tightness detector and a water tank, wherein the rack is used for fixing a detected workpiece, the air tightness detector is used for conveying air to the detected workpiece, detection liquid is filled in the water tank, the rack and the water tank are both fixed, a partition plate is fixed in the water tank, the rack is arranged above the partition plate, a water through hole is formed in the partition plate, the water tank below the partition plate is filled with the detection liquid, an air inlet pipe is communicated with the position, far away from the water through hole, of the water tank, the other end, far away from the water tank, of the air inlet pipe is connected with an air pressure tank, an air vent valve is arranged on the air inlet pipe, an exhaust valve, far away from the water through hole, is further arranged on the water tank, and the exhaust valve is used for exhausting air in the detection liquid in the water tank. The scheme is used for solving the problems of high sealing difficulty of the water tank or high cost of the lifter existing in the conventional combined type air tightness detection device.

Description

Air tightness detection device

Technical Field

The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device.

Background

In the prior art, two modes of dry air detection and wet water detection are adopted for air tightness detection of a product, during the air detection, air is introduced into a sealed product through an air tightness detector, then pressure change is checked within a certain time, whether the product is unqualified in air tightness is judged according to the condition of pressure leakage or not, but only whether the tested product is qualified or not is known in the mode, and the position of specific unqualified product is not known for the unqualified product; the water detection mode is to soak the product with air pressure in water to see whether air bubbles emerge from the surface of the product, and the position with unqualified air tightness can be known through the position with air bubbles emerging, but the water detection is judged by relying on experience of workers, and under the condition of short time or small pressure, the time of air leakage generated at the air leakage position is not well mastered, so that the water detection mode is greatly influenced by subjective judgment, the detection efficiency is low and the detection is not necessarily accurate.

In the prior art, a combined air tightness test device combining dry air test and wet water test is proposed by a person skilled in the art, for example, a test device for combined air tightness of CN214843828U of chinese patent publication No. CN113624408a, and a final speed reducer assembly air tightness test device for combining dry and wet is disclosed, however, in CN214843828U, the water tank needs to be lifted when wet test is performed, the whole device for installing a workpiece needs to be lifted in CN113624408a, and if the water tank is lifted, the sealing difficulty of the water tank is high, and if the device for installing a workpiece is lowered, the workpiece needs to be supported by a base from the bottom and needs to be compacted by a compacting plate from the top, both the support of the base and the compaction of the workpiece by the compacting plate will be a lifter, so the requirement of the lifter is high, especially for the workpieces with multiple cooling pipelines and needing a plurality of compacting structures for compacting the workpiece such as an engine cooler cover, the lifter has a higher load and a higher cost.

Disclosure of Invention

The utility model aims to provide an air tightness detection device to solve the problems of high sealing difficulty of a water tank or high cost of a lifter in the existing combined air tightness detection device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a gas tightness detection device, including the rack, gas tightness detector and water tank, the rack is used for fixed measured work piece, the gas tightness detector is used for carrying gas to the measured work piece, be equipped with the detection liquid in the water tank, the rack is all fixed with the water tank, the water tank internal fixation has the baffle, the rack is installed in the top of baffle, be equipped with the limbers on the baffle, it detects liquid to fill in the water tank below the baffle, the intercommunication has the intake pipe in the position that the limbers was kept away from to the water tank, the other end that the water tank was kept away from to the intake pipe is connected with the atmospheric pressure jar, install the breather valve in the intake pipe, still install the discharge valve that keeps away from the limbers on the water tank, the discharge valve is used for discharging the gas in the detection liquid in the water tank.

The principle and the advantages of the scheme are as follows: when the air tightness detection is needed to be carried out on the workpiece in actual application, an air source enters the workpiece after passing through the air tightness detector, and whether the workpiece leaks air is judged according to the pressure drop condition of the air tightness detector within a certain time; simultaneously, the wet detection can be synchronous with the dry detection or can be carried out after the dry detection is performed after the work piece is unqualified, in the wet detection, the vent valve is opened and the vent valve is closed, compressed air flows through the vent valve after being discharged from the air pressure tank and finally enters the water tank, the detection liquid in the water tank flows through the water through hole, the air inlet pipe and the vent valve are far away from the water through hole, so that the pressure in the water tank is increased by the compressed air, the detection liquid is upwards flushed from the water through hole under the pressure, the air supply of the air pressure tank is stopped until the detection liquid completely submerges the work piece, the water pressure in the water tank is ensured to be in a stable state, at the moment, the leakage position of the work piece can emit air bubbles, and workers make marks at the bubbling position to finish the whole air tightness detection; after the air tightness detection is finished, the air pressure tank and the ventilation valve are closed, the exhaust valve is opened, the air in the detection liquid is discharged from the exhaust valve, the pressure in the water tank is reduced, and the detection liquid flowing above the partition plate flows back into the water tank below the partition plate under the action of gravity.

The whole process of this scheme need not set up the riser, has simplified mechanical structure, has avoided the problem that brings because of lifting water tank or lifting rack among the prior art.

Preferably, as a modification, the position of the exhaust valve is not lower than the position of the water through hole.

Preferably, as an improvement, a water outlet for discharging the detection liquid in the water tank is further arranged at the bottom of the water tank, so that the detection liquid can be replaced conveniently.

Preferably, as an improvement, a filter screen is installed on the water through hole so as to prevent external impurities from falling into the water tank.

Preferably, as an improvement, the rack comprises a top plate, a pressing plate and a bottom plate which are sequentially arranged from top to bottom, wherein the top plate is fixedly connected with the pressing plate through a supporting column which is arranged, a lifter is fixed on the top plate, the pressing plate is fixed on the output end of the lifter, a pressing head is fixed on the pressing plate, a first buffer block is fixed at the bottom end of the pressing head, and the pressing head is used for pressing on a workpiece or sealing an opening at the top of the workpiece; the pusher is fixedly connected to the bottom plate, the output end of the pusher is fixedly provided with a side pressing block, the pusher is used for driving the side pressing block to be close to or far away from the side face of the workpiece, a second buffer block is fixedly arranged on one face, facing the workpiece, of the side pressing block, and the side pressing block is used for pressing the side face of the workpiece or plugging an opening of the side face of the workpiece; the work piece can cover on the bottom plate, and it has the inlet channel to open on the bottom plate, and inlet channel one end and airtight detection nature detector intercommunication, the inlet channel other end can with cover the cavity intercommunication of work piece on the bottom plate.

According to the scheme, the bottom plate and the pressing plate are arranged, so that the workpiece is pressed tightly and sealed, and the air tightness test is conveniently carried out on the workpiece.

Preferably, as an improvement, the bottom cushion pad is fixed on the bottom plate, which is favorable for improving the sealing effect on the workpiece.

Preferably, as a modification, the number of the pressure heads is not less than the number of the openings at the top of the workpiece, and the pressure heads are arranged at the top of the center of the workpiece.

Preferably, as an improvement, a guide rod is further fixed on the top plate, and the pressing plate is vertically and slidably connected to the guide rod.

Preferably, as an improvement, the number of the side pressing blocks is not less than the number of the side openings of the workpiece, and the side pressing blocks with the same moving direction are driven by the same pusher.

Further, as an improvement, a positioning column is fixed on the bottom plate and is used for being inserted into a positioning hole or a mounting hole of the workpiece.

Drawings

Fig. 1 is a front cross-sectional view (only the water tank is cut away) of a first embodiment of the present utility model.

Fig. 2 is a schematic front view of a stage according to a second embodiment of the present utility model when no workpiece is placed (only the ram with the first buffer block is mounted on the press block is shown, and the number of the ram and the side pressure block is not shown).

Fig. 3 is a perspective view in section A-A of fig. 2 after placement of a workpiece.

Fig. 4 is a perspective view in section B-B of fig. 2 after placement of a workpiece.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: the air-tightness detecting device comprises a rack 1, a ceiling 11, a pressing plate 12, a bottom plate 13, a pressing head 14, a first buffer block 141, a side pressure block 15, a second buffer block 151, a lifter 16, a bottom buffer pad 131, an air inlet channel 132, a pusher 17, a guide rod 18, a positioning column 19, an air-tightness detector 2, an air supply pipe 21, a water tank 3, a partition plate 31, a water through hole 311, a filter screen 312, an air inlet pipe 32, a drain pipe 33, an air vent valve 4, an air pressure tank 5, an air vent valve 6 and a gate valve 7.

Example 1

Basically as shown in fig. 1, the air tightness detection device comprises a bench 1, an air tightness detector 2 and a water tank 3, wherein the bench 1 is used for fixing a workpiece to be detected, the air tightness detector 2 is used for conveying air to the workpiece to be detected (the air tightness detector 2 is communicated with an air source), an air inlet channel 132 is designed on the bench 1 in the embodiment, an air supply pipe 21 is arranged on the air inlet channel 132, one end of the air supply pipe 21 is communicated with an air vent groove (the air vent groove is used for being communicated with a cavity on the workpiece) arranged on the bench 1, and the other end of the air supply pipe 21 is communicated with the air tightness detector 2.

The water tank 3 is filled with detection liquid, in this embodiment, the detection liquid adopts water, the rack 1 and the water tank 3 are both fixed, the partition plate 31 is fixed in the water tank 3, the rack 1 is fixedly installed above the partition plate 31, taking fig. 1 as an example, the left end of the partition plate 31 is processed with a water through hole 311, a filter screen 312 is installed on the water through hole 311, the water tank 3 below the partition plate 31 is filled with water, when the water tank 3 is not subjected to external pressure, the liquid level of the detection liquid (water) in the water tank 3 is higher than the water through hole 311, the right side wall of the water tank 3 far away from the water through hole 311 of the water tank 3 is communicated with an air inlet pipe 32, the right end of the air inlet pipe 32 is connected with an air pressure tank 5, an air pressure valve 4 is installed on the air inlet pipe 32, compressed air in the air pressure tank 5 is sent into the water tank 3 after passing through the air pressure valve 4, the side wall of the water tank 3 far away from the water through hole 311 (the right side wall of the water tank 3 in this embodiment is provided with an exhaust valve 6, and the exhaust valve 6 is used for exhausting air in the detection liquid in the water tank 3).

The exhaust position of the exhaust valve 6 is not lower than the position of the water through hole 311, so that gas entering the water tank 3 can gather towards the position of the exhaust valve 6, and the problem that the water tank 3 cannot be pressurized or the pressurizing effect of the water tank 3 is poor due to the fact that the gas gathers towards the water through hole 311 is avoided.

The bottom of the water tank 3 is also provided with a water outlet for discharging the detection liquid in the water tank 3, and the water outlet is connected with a water outlet pipe 33. The drain pipe 33 is provided with a gate valve 7 so that the detection liquid in the water tank 3 needs to be replaced, and the detection liquid can be discharged by opening the gate valve 7.

When the air tightness of the workpiece is detected, for example, when the air tightness of an engine cooler cover is detected, the workpiece is arranged on the rack 1, the workpiece is sealed through the rack 1, then an air source for supplying air to the air tightness detector 2 is opened, so that the air is sent into a workpiece cavity sealed by the rack 1 through the air tightness detector 2 and the air supply pipe 21, after the air is sent to reach a set amount, the air source is closed, the air tightness detector 2 displays the pressure condition communicated with the workpiece cavity, when the pressure drop displayed in the set time meets the preset requirement, the air tightness of the workpiece is proved to be qualified, and when the pressure drop displayed in the set time does not meet the preset requirement, the air tightness of the workpiece is proved to be unqualified. This is the air test.

In order to ensure that the air detection and the water detection are carried out simultaneously, after the bench 1 completes the compaction and the sealing of the workpiece, namely, the gate valve 7 and the exhaust valve 6 are closed, the vent valve 4 and the air pressure tank 5 are opened, so that compressed air flows through the vent valve 4 and finally enters the water tank 3 after being discharged from the air pressure tank 5, the pressure in the water tank 3 is increased by the compressed air due to the fact that the detection liquid in the water tank 3 overflows through the water through holes 311, the air inlet pipe 32 and the exhaust valve 6 are further away from the water through holes 311, the pressure in the water tank 3 is increased by the compressed air, the air supply of the air pressure tank 5 is stopped until the detection liquid completely floods the workpiece, the water pressure in the water tank 3 is ensured to be in a stable state, at the moment, the leakage position of the workpiece can emit air bubbles, and a worker marks the bubbling position, so that the whole air tightness detection is completed; after the air tightness detection is completed, the air pressure tank 5 and the ventilation valve 4 are closed, the exhaust valve 6 is opened, the air in the detection liquid is discharged from the exhaust valve 6, the pressure in the water tank 3 is reduced, and the detection liquid flowing above the partition plate 31 flows back into the water tank 3 below the partition plate 31 under the action of gravity.

In the embodiment, the air detection mode and the water detection mode are combined, and a driving source for driving the water tank 3 to lift or driving the rack 1 to lift is not required to be designed after the air detection mode and the water detection mode are combined, so that the whole airtight detection device is simpler in structure and lower in cost.

Example two

Referring to fig. 2 to 4, a second embodiment is an improvement of the stage 1 for mounting a workpiece on the basis of the first embodiment, and is specifically as follows: the rack 1 comprises a top plate 11, a pressing plate 12 and a bottom plate 13 which are sequentially arranged from top to bottom, wherein the top plate 11 is fixedly connected with the pressing plate 12 through a supporting column which is arranged, the pressing plate 12 is fixed at the top of the partition plate 31, a lifter 16 is fixed on the top plate 11, the pressing plate 12 is fixed at the output end of the lifter 16, a pressing head 14 is fixed on the pressing plate 12, a first buffer block 141 is fixed at the bottom end of the pressing head 14, and the pressing head 14 is used for pressing on a workpiece or plugging an opening at the top of the workpiece; the pusher 17 is fixedly connected to the bottom plate 13, a side pressing block 15 is fixed at the output end of the pusher 17, the pusher 17 is used for driving the side pressing block 15 to be close to or far away from the side surface of the workpiece, a second buffer block 151 is fixed on one surface of the side pressing block 15 facing the workpiece, and the side pressing block 15 is used for pressing on the side surface of the workpiece or plugging an opening of the side surface of the workpiece; the work piece can cover on bottom plate 13, opens on bottom plate 13 has air inlet channel 132, and air inlet channel 132 one end and airtight detection nature detector pass through the pipeline intercommunication, and air inlet channel 132 other end can with cover the cavity intercommunication of work piece on bottom plate 13. In this embodiment, the pusher 17 is fixed on the bottom plate 13, and the pusher 17 and the lifter 16 are both cylinders.

The bottom cushion 131 is also fixed on the bottom plate 13, which is beneficial to improving the sealing effect on the workpiece. The first buffer block 141, the second buffer block 151 and the bottom buffer block are all rubber blocks or silica gel blocks.

The top plate 11 is also fixed with a guide rod 18, and the pressing plate 12 is vertically and slidably connected to the guide rod 18. The number of the pressing heads 14 is not less than the number of openings at the top of the workpiece, the pressing heads 14 are arranged at the top of the center of the workpiece, all the pressing heads 14 are connected to the pressing plate 12 through pressing rods fixedly connected, the length of each pressing rod is adjusted according to the height of the pressing heads 14 and the pressed position of the workpiece, and after the pressing plate 12 is pressed downwards, all the openings at the top of the workpiece can be plugged by all the pressing heads 14 at the same time.

The number of the side pressing blocks 15 is not less than the number of the side openings of the workpiece, the side pressing blocks 15 with the same moving direction are driven by the same pusher 17, and in order to ensure that the side openings of the workpiece can be simultaneously plugged by different side pressing blocks 15 driven by the same pusher 17, a connecting rod is fixedly connected between the output end of the pusher 17 and the side pressing blocks 15.

The base plate 13 is fixed with a positioning column 19, and the positioning column 19 is used for being inserted into a positioning hole or a mounting hole of a workpiece.

The embodiment makes the placement of the workpiece before the air tightness detection simple and convenient by improving the rack 1. When the workpiece is placed, the mounting holes or the positioning holes of the workpiece are aligned with the positioning columns 19 on the bottom plate 13 to limit the placement position of the workpiece, then the lifter 16 is started, the pressure head 14 is enabled to be fully pressed downwards to tightly press the workpiece from the top of the workpiece, and finally the pusher 17 is started, the side pressure block 15 is enabled to fully seal the openings on the side face of the workpiece, the fixing and the pressing of the workpiece are completed, and the subsequent air tightness test is facilitated.

The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. The utility model provides a gas tightness detection device, includes rack, gas tightness detector and water tank, and the rack is used for fixed measured work piece, and the gas tightness detector is used for sending gas to the measured work piece, is equipped with detection liquid in the water tank, its characterized in that: the bench is fixed with the water tank, the bench is installed in the top of baffle, be equipped with the limbers on the baffle, fill with the detection liquid in the water tank below the baffle, the intercommunication has the intake pipe on the position that the limbers were kept away from to the water tank, the other end that the water tank was kept away from to the intake pipe is connected with the pneumatic tank, installs the breather valve in the intake pipe, still installs on the water tank and keeps away from the discharge valve of limbers, discharge valve is arranged in discharging the gas in the detection liquid in the water tank.

2. The air tightness detection device according to claim 1, wherein: the position of the exhaust valve is not lower than the position of the water through hole.

3. The air tightness detection device according to claim 1, wherein: the bottom of the water tank is also provided with a water outlet for discharging detection liquid in the water tank.

4. The air tightness detection device according to claim 1, wherein: and a filter screen is arranged on the water through hole.

5. The air tightness detection device according to claim 1, wherein: the rack comprises a top plate, a pressing plate and a bottom plate which are sequentially arranged from top to bottom, wherein the top plate is fixedly connected with the pressing plate through a supporting column which is arranged, a lifter is fixed on the top plate, the pressing plate is fixed on the output end of the lifter, a pressing head is fixed on the pressing plate, the bottom end of the pressing head is fixed with a first buffer block, and the pressing head is used for pressing on a workpiece or plugging an opening at the top of the workpiece; the pusher is fixedly connected to the bottom plate, the output end of the pusher is fixedly provided with a side pressing block, the pusher is used for driving the side pressing block to be close to or far away from the side face of the workpiece, a second buffer block is fixedly arranged on one face, facing the workpiece, of the side pressing block, and the side pressing block is used for pressing the side face of the workpiece or plugging an opening of the side face of the workpiece; the work piece can cover on the bottom plate, and it has the inlet channel to open on the bottom plate, and inlet channel one end and airtight detection nature detector intercommunication, the inlet channel other end can with cover the cavity intercommunication of work piece on the bottom plate.

6. The air tightness detection device according to claim 5, wherein: the bottom cushion pad is fixed on the bottom plate.

7. The air tightness detection device according to claim 5, wherein: the number of the pressure heads is not less than the number of the openings at the top of the workpiece, and the pressure heads are arranged at the top of the center of the workpiece.

8. The air tightness detection device according to claim 7, wherein: the upper plate is also fixedly provided with a guide rod, and the pressing plate is vertically and slidably connected to the guide rod.

9. The air tightness detection device according to claim 5, wherein: the number of the side pressing blocks is not less than the number of the side openings of the workpiece, and the side pressing blocks with the same moving direction are driven by the same pusher.

10. The air tightness detection device according to claim 5, wherein: and a positioning column is fixed on the bottom plate and is used for being inserted into a positioning hole or a mounting hole of the workpiece.