阅读说明：本技术 用于工件密封性检测的试验装置 (Test device for detecting tightness of workpiece ) 是由 振前 李志鹏 吴盈志 张红涛 田捍卫 叶卫林 王东伟 刘建军 池永鹏 李�浩 于 2020-07-07 设计创作，主要内容包括：本发明涉及气密性检测技术领域,具体涉及用于工件密封性检测的试验装置。用于工件密封性检测的试验装置包括：设有容纳腔的壳体、可拆连接在壳体的工件放入口处的压盖；壳体上设有用于与气源连接的进气口；压盖上设有观察孔；观察孔的下端孔口处设有用于与待检测工件上的软密封密封配合的适配密封结构；试验装置还包括：沿壳体上下方向可活动的设置在壳体内的工件定位座；工件定位座上设有供气体进入至工件定位座下方的气体通道,待检测工件与压盖密封配合后,在工件定位座下方的气体压力作用下,使得待检测工件与压盖保持密封配合。与现有技术相比,本试验装置能适应不同高度尺寸的工件的密封性检测。(The invention relates to the technical field of airtightness detection, in particular to a test device for workpiece airtightness detection. A test device for work piece leakproofness detects includes: the device comprises a shell provided with an accommodating cavity and a gland detachably connected to a workpiece inlet of the shell; the shell is provided with an air inlet which is used for being connected with an air source; the gland is provided with an observation hole; an adaptive sealing structure which is used for being in sealing fit with the soft seal on the workpiece to be detected is arranged at the orifice at the lower end of the observation hole; the test device further comprises: the workpiece positioning seat is movably arranged in the shell along the vertical direction of the shell; the workpiece positioning seat is provided with a gas channel for gas to enter below the workpiece positioning seat, and after the workpiece to be detected is in sealing fit with the gland, the workpiece to be detected is kept in sealing fit with the gland under the action of gas pressure below the workpiece positioning seat. Compared with the prior art, the test device can adapt to the tightness detection of workpieces with different height sizes.)

1. A test device for work piece leakproofness detects includes:

the shell is provided with an accommodating cavity, and the upper end of the accommodating cavity is provided with a workpiece placing opening; the shell is also provided with an air inlet which is used for being connected with an air source and communicated with the accommodating cavity;

the pressing cover is detachably connected to the workpiece inlet of the shell and is in sealing fit with the shell; an observation hole is formed in the gland, and an annular adaptive sealing structure is arranged at the orifice at the lower end of the observation hole and is used for being matched with a soft seal on a workpiece to be detected in a sealing manner;

characterized by, the test device still includes:

the workpiece positioning seat is provided with a positioning space for placing a workpiece to be detected in the vertical direction, and the workpiece to be detected is positioned and matched with the workpiece positioning seat in the direction vertical to the vertical direction;

the workpiece positioning seat is movably arranged in the shell along the vertical direction of the shell, and a gas channel is arranged on the workpiece positioning seat and/or the shell and is used for communicating the accommodating cavity with the lower part of the workpiece positioning seat, so that gas enters the lower part of the workpiece positioning seat, and the workpiece to be detected is in sealing fit with the gland under the action of gas pressure below the workpiece positioning seat; alternatively, the first and second electrodes may be,

the workpiece positioning seat supplies to detect the work piece and sets up along upper and lower direction activity, is equipped with gas passage on workpiece positioning seat and/or the casing for make hold the chamber and detect work piece below intercommunication, the gas enters into to the worker and detects work piece below, and then makes to detect work piece and gland seal cooperation back, under the gas pressure effect of detecting work piece below, makes to detect work piece and gland and keep sealed fit state.

2. The testing device for leak tightness test of workpieces as set forth in claim 1, wherein said workpiece positioning seat comprises:

a base portion;

the adapting part is arranged to protrude upwards from the base part to form the positioning space.

3. The testing device for leak tightness test of workpieces as set forth in claim 2, wherein said fitting portion is a fitting cylinder.

4. The test device for detecting the tightness of the workpiece according to claim 2 or 3, wherein the base portion is a positioning plate, the positioning plate is movably arranged in the shell along the vertical direction of the shell, and the positioning plate is used for plugging a through hole which is formed in the workpiece to be detected and penetrates up and down.

5. The testing device for leak tightness test of workpieces as set forth in claim 4, wherein said gas passage is provided on a positioning plate.

6. The testing device for testing the tightness of workpieces according to any one of claims 1 to 3, wherein the housing is provided with an internal thread or an external thread, the gland is provided with an adaptive thread, the adaptive thread is used for being in threaded connection with the internal thread or the external thread, and the gland is in threaded connection with the housing.

7. The testing device for testing the tightness of workpieces as claimed in claim 6, wherein the gland comprises a connecting cylinder, the connecting cylinder extends along the vertical direction, the external thread is arranged on the connecting cylinder, and the connecting cylinder is inserted into the shell and is in threaded connection with the shell.

8. The test device for detecting the tightness of the workpiece according to claim 6, wherein the gland is provided with an external hexagonal structure for matching with a tool for screwing the gland.

9. The testing device for leak tightness test of workpieces according to claim 6, wherein the outer shape of said housing is rectangular.

10. The testing device for workpiece tightness testing according to any one of claims 1 to 3, wherein the gland is provided with a gland sealing surface facing downwards, the housing is provided with a housing sealing surface facing upwards, and a sealing ring is provided between the gland sealing surface and the housing sealing surface.

Technical Field

The invention relates to the technical field of airtightness detection, in particular to a test device for workpiece airtightness detection.

Background

The soft and hard seal has good sealing performance and enough strength, so that the soft and hard seal is widely applied to the technical field with high sealing performance requirements such as valves and the like. For example, in the utility model with the publication number of CN209943577U, a groove is formed on the valve element of the ball valve, a rubber ring is fixed in the groove by vulcanization, when the valve element is closed, the valve element contacts with the hard sealing surface of the valve seat to form a hard seal, and the rubber ring presses against the valve seat to form a soft seal, so as to realize the soft-hard double seal of the ball valve; as disclosed in the utility model with the publication number of CN206458849U, when the rotary half ball valve is in the closed state, the spherical crown of the half ball valve is connected with the valve seat to form a hard sealing area, and the spherical crown is connected with the soft sealing to form a soft sealing area, so as to realize the soft and hard dual sealing of the half ball valve.

The soft material in the soft and hard seal can be plastic, resin and the like besides rubber, and is fixed in a reserved groove in an embedding or vulcanizing manner. The processing quality of the soft material sealing surface directly influences the performance of the sealing pair, and after the processing is finished, besides the size and the roughness meet the requirements of a drawing, the tightness of a workpiece needs to be detected through a testing device, and the tightness of the soft sealing fixing position is tested.

Disclosure of Invention

The invention aims to provide a testing device for detecting the tightness of a workpiece, which aims to solve the technical problem that the testing device for detecting the tightness of the workpiece in the prior art is poor in universality.

In order to achieve the purpose, the technical scheme of the test device for detecting the tightness of the workpiece is as follows:

a test device for work piece leakproofness detects includes:

the shell is provided with an accommodating cavity, and the upper end of the accommodating cavity is provided with a workpiece placing opening; the shell is also provided with an air inlet which is used for being connected with an air source and communicated with the accommodating cavity;

the pressing cover is detachably connected to the workpiece inlet of the shell and is in sealing fit with the shell; an observation hole is formed in the gland, and an annular adaptive sealing structure is arranged at the orifice at the lower end of the observation hole and is used for being matched with a soft seal on a workpiece to be detected in a sealing manner;

the test device further comprises:

the workpiece positioning seat is provided with a positioning space for placing a workpiece to be detected in the vertical direction, and the workpiece to be detected is positioned and matched with the workpiece positioning seat in the direction vertical to the vertical direction;

the workpiece positioning seat is movably arranged in the shell along the vertical direction of the shell, and a gas channel is arranged on the workpiece positioning seat and/or the shell and is used for communicating the accommodating cavity with the lower part of the workpiece positioning seat, so that gas enters the lower part of the workpiece positioning seat, and the workpiece to be detected is in sealing fit with the gland under the action of gas pressure below the workpiece positioning seat; or, the work piece positioning seat supplies to detect the work piece and sets up along upper and lower direction activity, is equipped with gas channel on work piece positioning seat and/or the casing for make hold the chamber and detect work piece below intercommunication, the gas enters into to the worker and detects work piece below, and then makes to detect the work piece and gland seal cooperation back, under the gas pressure effect of detecting work piece below, makes to detect the work piece and gland and keep sealed fit state.

The invention has the beneficial effects that: by arranging the workpiece positioning seat, the workpiece positioning seat is guided along the vertical direction of the shell or the workpiece to be detected is guided along the vertical direction of the shell, so that the workpiece to be detected is positioned in the shell along the direction vertical to the vertical direction, the alignment of the soft seal of the workpiece to be detected and the adaptive sealing structure of the gland in the vertical direction is ensured, and at the moment, the soft seal of the workpiece to be detected and the sealing matching of the gland can be realized only by moving the workpiece to be detected up and down; the workpiece to be detected and the gland are kept in a sealing matching state through gas pressure, so that enough movable space can be reserved for the workpiece to be detected in the vertical direction of the shell, when the gland is prevented from being connected with the shell to form sealing matching, the gland and the workpiece to be detected are interfered in the vertical direction, compared with the prior art, the workpiece to be detected is directly compressed at the bottom of the shell through the gland to realize sealing matching with the gland, the size of the accommodating cavity in the vertical direction can be larger, the sealing performance detection of the workpieces with different height sizes is adapted, and the universal joint device has good universality. In addition, if the workpiece to be detected is a valve for switching on and off gas, the gas pressure introduced into the accommodating cavity can be set according to the gas pressure to be switched on and off, so that the test parameters are closer to the use parameters, and the test result is more accurate.

As a preferable technical solution, the workpiece positioning seat includes:

a base portion;

the adapting part is arranged to protrude upwards from the base part to form the positioning space.

Has the advantages that: the adaptation part can realize waiting to detect the reliable location of work piece in with upper and lower direction vertically orientation to the better soft seal that makes the work piece of waiting to detect aligns with the adaptation seal structure of gland in upper and lower direction, and then the leakproofness is better when making soft seal and adaptation seal structure seal cooperation, is favorable to improving experimental precision.

As a preferred technical scheme, the adapting part is an adapting cylinder.

Has the advantages that: the adaptive cylinder has high positioning precision on the workpiece to be detected, and is favorable for improving the test precision.

According to the preferable technical scheme, the base part is a positioning plate, the positioning plate is movably arranged in the shell along the vertical direction of the shell, and the positioning plate is used for plugging a through hole which is communicated up and down on a workpiece to be detected.

Has the advantages that: the locating plate can be followed the casing and moved about the direction to can change the work piece positioning seat, like this, when waiting to detect the product size in the direction of the vertical direction of perpendicular to and change, only need to detect the size of work piece change with its adaptation the work piece positioning seat can, and need not change a whole set of test device, be favorable to under the condition of saving the cost, further increase test device's commonality. In addition, the through hole which is through from top to bottom of the workpiece to be detected is plugged through the positioning plate, so that the experimental device can be used for detecting the sealing property of the workpiece with the through hole which is through from top to bottom, and the universality of the experimental device is further improved.

As a preferable technical scheme, the gas channel is arranged on the positioning plate.

Has the advantages that: the gas channel sets up on the locating plate, has also changed gas channel when changing the locating plate, and it can directly make gas channel and hold the intercommunication in chamber, makes things convenient for experimental operation.

As a preferred technical scheme, the shell is provided with internal threads or external threads, the gland is provided with adaptive threads, and the adaptive threads are used for being in threaded connection with the internal threads or the external threads so as to connect the gland onto the shell in a threaded manner.

Has the advantages that: the gland is in threaded connection with the shell, so that the connection and the disassembly between the gland and the shell are facilitated. In addition, it should be noted that, because the workpiece to be detected and the gland are kept in a sealing fit state through gas pressure, when the gland is connected with the shell to form sealing fit, a certain gap or interval can be left between the gland and the workpiece to be detected in the vertical direction, so that the sealing surface of the workpiece to be detected can be effectively prevented from being crushed in the gland screwing process.

As a preferable technical scheme, the gland comprises a connecting cylinder, the connecting cylinder extends along the vertical direction, the external thread is arranged on the connecting cylinder, and the connecting cylinder is inserted in the shell and is in threaded connection with the shell.

Has the advantages that: the connecting cylinder cartridge is in the casing, stretches into the process of casing at the connecting cylinder, and the casing can carry out better location to gland with upper and lower direction vertically direction to better messenger's gland's adaptation seal structure aligns with the soft seal of waiting to detect the work piece in upper and lower direction, and then makes adaptation seal structure and soft seal complex leakproofness better, is favorable to improving experimental precision.

As a preferred technical scheme, an outer hexagonal structure is arranged on the gland and is used for being matched with a tool for screwing the gland.

Has the advantages that: the screwing operation of the gland is convenient to carry out, and the connection and the disassembly between the gland and the shell are further convenient.

Preferably, the housing has a rectangular outer shape.

Has the advantages that: the outside of casing is established to the rectangle, conveniently carries out circumference spacing through corresponding instrument card in the casing outside and to the casing, and then conveniently realizes being connected and dismantling of gland and casing through revolving the twist gland.

According to the preferable technical scheme, a downward gland sealing surface is arranged on the gland, an upward shell sealing surface is arranged on the shell, and a sealing ring is arranged between the gland sealing surface and the shell sealing surface.

Has the advantages that: the sealing ring is favorable for increasing the sealing performance of the joint of the gland and the shell, and the test result is prevented from being influenced by air leakage in the test process.

Drawings

Fig. 1 is a perspective view of a test apparatus for leak detection of a workpiece according to an embodiment 1 of the present invention;

FIG. 2 is a cross-sectional view of the front view of FIG. 1;

fig. 3 is a schematic structural view of the workpiece positioning seat in fig. 2.

1-a shell; 11-a containment chamber; 12-an air inlet nozzle; 13-a housing sealing surface; 14-an air inlet; 2-pressing the cover; 21-a viewing aperture; 22-an annular rib; 23-gland sealing face; 24-a connector barrel; 25-outer hexagonal structure; 3-workpiece positioning seat; 31-an adapter cartridge; 32-positioning plate; 33-a vent hole; 4-sealing ring; 5-valve core; 51-soft sealing; 52-stepped bore.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

Embodiment 1 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the testing device in this embodiment is used for detecting the sealing performance of the valve element, as shown in fig. 2, the valve element 5 includes a valve element sealing surface and a soft seal 51 disposed on the valve element sealing surface, and the testing device is used for detecting the sealing performance between the valve element sealing surface and the soft seal 51.

As shown in fig. 1 and 2, the testing device comprises a shell 1, a gland 2 and a workpiece positioning seat 3, wherein the shell 1 is provided with an accommodating cavity 11, the upper end of the accommodating cavity 11 is provided with a workpiece placing opening, and the workpiece placing opening is used for placing a valve core 5 into the accommodating cavity 11; the right side of the shell 1 is provided with an air inlet 14 communicated with the accommodating cavity 11, and the air inlet 14 is used for being connected with an air source and introducing air into the accommodating cavity 11.

As shown in fig. 1 and 2, the gland 2 includes a connecting cylinder 24 extending in the up-down direction, an external thread is provided on the connecting cylinder 24, an internal thread is provided on the inner wall of the housing 1, and the internal thread is connected with the external thread as an adapting thread to realize the threaded connection between the gland 2 and the housing 1. Be equipped with gland sealing surface 23 down on gland 2, gland sealing surface 23 is located the connecting cylinder 24 outside on the left right direction, and casing 1's upper end is equipped with up casing sealing surface 13, is equipped with sealing washer 4 between casing sealing surface 13 and the gland sealing surface 23, guarantees the leakproofness to gland 2 and casing 1 junction.

As shown in fig. 1, the upper end of the gland 2 is provided with an outer hexagonal structure 25, and the outer hexagonal structure 25 is used for being matched with a tool for screwing the gland 2; the outer shape of the shell 1 is rectangular, and other tools can be clamped outside the shell 1, so that the gland 2 can be conveniently screwed by the tools, and the gland 2 is connected with or detached from the shell 1.

As shown in fig. 1 and 2, the gland 2 is provided with an observation hole 21, an inner end of the observation hole 21 is provided with an annular rib 22, and a top surface of the annular rib 22 serves as a fitting sealing structure of the gland 2 and is used for sealing and matching with the soft seal 51.

As shown in fig. 2 and 3, the workpiece positioning seat 3 includes an adapter cylinder 31 and a positioning plate 32, the adapter cylinder 31 protrudes upward out of the positioning plate 32 to form a positioning space for placing the valve core 5, and the positioning plate 32 is movably disposed in the housing 1 along the vertical direction of the housing 1. The adaptive cylinder 31 is used as an adaptive part for placing the valve core 5 into the positioning space along the up-down direction and positioning and matching the valve core 5 along the direction vertical to the up-down direction, namely, the valve core 5 is positioning and matching with the adaptive cylinder 31 along the horizontal direction; the positioning plate 32 serves as a base portion and is in positioning fit with the side wall of the accommodating cavity 11 along the horizontal direction, so that when the workpiece positioning seat 3 is placed in the housing 1 after being adapted to the valve core 5, the valve core 5 is ensured to be located at the center of the accommodating cavity 11.

As shown in fig. 2, since the valve core 5 has a stepped hole 52 penetrating in the vertical direction in the middle, the positioning plate 32 also serves to block the stepped hole 52, so as to prevent gas from flowing out of the stepped hole 52 and making it impossible to detect the sealing property, and the adapter cylinder 31 is engaged with the positioning plate 32 to provide a better blocking effect on the stepped hole 52.

As shown in fig. 2, an air inlet nozzle 12 is fixed at the air inlet 14 of the housing 1, and the interface of the air inlet nozzle 12 is a tapered opening with gradually increasing size from inside to outside, and the tapered opening is used for connecting with an air source. As shown in fig. 3, the positioning plate 32 is provided with a vent hole 33 penetrating in the vertical direction, and the vent hole 33 is communicated with the accommodating chamber 11 as a gas passage, so that the gas entering from the gas inlet 14 is introduced below the workpiece positioning seat 3. After being in sealing fit with the gland 2, the soft seal 51 is kept in a state of being in sealing fit with the gland 2 under the action of gas pressure introduced below the workpiece positioning seat 3.

The test device for detecting the tightness of the workpiece has the specific using process that:

firstly, a workpiece positioning seat 3 with a proper size is selected according to the size and the shape of a valve core 5, the valve core 5 is placed in the workpiece positioning seat 3 and combined with the workpiece positioning seat 3, and then a valve core sealing surface of the valve core 5 faces upwards and is placed in a shell 1. Then, the sealing ring 4 is placed at the end part of the shell 1, the gland 2 is in threaded connection with the shell 1, the sealing ring 4 is compressed, sealing between the shell 1 and the gland 2 is guaranteed, at the moment, a certain interval is reserved between the valve core sealing surface and the gland sealing surface 23 of the gland 2, and the valve core sealing surface is prevented from being crushed in the screwing process.

And then, inverting the assembled test device, allowing the valve core 5 to freely fall onto the gland 2, enabling the soft seal 51 of the valve core 5 to be in sealing fit with the annular convex rib 22 of the gland 2, connecting the air inlet nozzle 12 of the shell 1 with an air source, introducing air with certain pressure, wherein the air inlet direction is the arrow direction in the figure 2, and turning over the test device to perform a sealing test after the air pressure is enough to tightly seal the soft seal 51 and the annular convex rib 22. In the test process, a few drops of alcohol are dropped into the observation hole 21 of the gland 2, the alcohol uniformly submerges the sealing surface of the valve core, and if the soft seal 51 of the valve core 5 is not sealed tightly, bubbles can be observed to emerge from the observation hole 21 of the gland 2, so that whether the sealing performance of the soft seal 51 is qualified or not is judged.

When the valve core 5 is replaced, if the dimension of the valve core only changes in the vertical direction, the sealing performance of the new valve core 5 can be detected without replacing any part; if the valve core 5 only changes in size in the horizontal direction, only the workpiece positioning seat 3 with the corresponding size needs to be replaced, and the shell 1 and the gland 2 do not need to be replaced; if the valve core 5 only has larger change of the size of the soft seal 51 in the horizontal direction, only the corresponding gland 2 needs to be replaced, and the shell 1 and the workpiece positioning seat 3 do not need to be replaced; if both the valve element 5 and the soft seal 51 have a large change in the horizontal dimension, the workpiece positioning seat 3 and the gland 2 need to be replaced at the same time, and the housing 1 does not need to be replaced.

It should be noted that, the pressure of the introduced air source is the actual working pressure of the valve element 5, and the structure of the annular protruding rib 22 is the same as that of the sealing matching portion of the valve seat, that is, the annular protruding rib 22 is in sealing matching with the soft seal 51, which is actually equivalent to that of the valve seat and the valve element 5, so that the test working condition is closer to the use working condition of the valve element, and the test is more accurate.

The test device for detecting the tightness of the workpiece has the advantages that:

1) the sealing performance tests of workpieces with different sizes can be realized, and the universality is better.

2) The test operation is simple, and the test result can be conveniently observed.

3) To different work pieces, do not need the redesign device, the work piece of new research and development can directly borrow current testing arrangement and test, perhaps only need design new work piece positioning seat 3 or gland 2 can for product research and development progress saves the research and development cost.

Embodiment 2 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the gas channel in the above embodiment 1 is constituted by the vent holes provided on the positioning plate; in this embodiment, an air inlet is arranged on the inner wall of the housing, the air inlet serves as an air passage, an opening at one end of the air inlet is communicated with the accommodating cavity, and an opening at the other end of the air inlet is communicated with the bottom of the workpiece positioning seat.

Embodiment 3 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the lower end surface of the positioning plate in the embodiment 1 is a plane; be provided with the air channel on the lower terminal surface of locating plate in this embodiment, the notch of air channel is down, air channel and gas passage intercommunication, after treating the work piece and pack into the casing and cover the gland, if the soft seal of treating the work piece just in time contacts with the gland or the clearance is very little, then need not invert test device, it just directly gets into the air channel through gas passage to hold the gas of intracavity, the gas in the air channel promotes work piece positioning seat rebound, it makes the soft seal and the gland seal cooperation of treating the work piece to drive to treat the work piece rebound, convenient test operation.

Embodiment 4 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the gland in the above embodiment 1 is screwed to the housing; in this embodiment, the gland flange plate is arranged on the gland, the shell flange plate is arranged at the upper end of the shell, the shell flange plate and the gland flange plate are connected through the bolts, the gland and the shell are fixed, at this time, when the gland and the shell are connected, the gland does not need to be screwed, and the problem that a workpiece to be detected is damaged due to pressure caused by screwing the gland can be completely avoided.

Embodiment 5 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the base part in the embodiment 1 is a circular positioning plate, and a through hole which is through up and down on the workpiece to be detected, namely the stepped hole in the embodiment 1, can be plugged through the positioning plate, so that gas is prevented from leaking from the through hole to influence the tightness test of the workpiece to be detected; the locating plate in this embodiment is the holding ring, and the locating plate can't realize treating the shutoff of detecting the work piece bottom promptly, and the work piece positioning seat is used for not having the leakproofness test of the work piece of through-hole that link up from top to bottom this moment.

Embodiment 6 of the test apparatus for leak tightness detection of a workpiece of the present invention:

an annular convex rib is arranged at the orifice of the lower end of the observation hole in the embodiment 1, and the top surface of the annular convex rib is used for being in soft sealing fit with a workpiece to be detected; in this embodiment, the lower end orifice of the observation hole is a plane, that is, the lower end orifice of the gland is flush with the gland sealing surface, and the annular surface on the gland, which is located on the radially inner side of the gland sealing surface, is used as an annular adaptive sealing structure and is used for being in sealing fit with the soft seal of the workpiece to be detected.

Embodiment 7 of the test apparatus for leak tightness detection of a workpiece of the present invention:

the workpiece positioning seat in the embodiment 1 is movably arranged in the housing along the up-down direction, and the workpiece to be detected is driven to move along the up-down direction of the housing through the movement of the workpiece positioning seat along the up-down direction of the housing, so that the workpiece to be detected is in sealing fit with the gland; the work piece positioning seat is fixed in the casing in this embodiment, and the locating plate is fixed in the casing promptly, and gas passage makes and holds the chamber and wait to detect work piece below intercommunication, and at this moment, the work piece positioning seat supplies to detect the work piece and set up along upper and lower direction activity, through waiting to detect the work piece along work piece positioning seat mountain down activity, realizes waiting to detect the sealed cooperation of work piece and gland to after waiting to detect work piece and gland sealed cooperation, gaseous by gas passage entering wait to detect the work piece below, the messenger waits to detect the work piece and the gland keeps in sealed cooperation state.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.