Standard leakage hole device

Abstract

The utility model provides a standard leak hole device, which comprises a shell, a plurality of leak holes, a plurality of connecting pieces and a plurality of connecting pieces, the partition plate is arranged in the shell and divides the interior of the shell into a first internal space located between the partition plate and the top wall and a second internal space located between the partition plate and the bottom wall of the shell; the connecting pipe is arranged in the second internal space, one end of the connecting pipe penetrates through the partition plate, and the other opposite end of the connecting pipe is an air inlet conical opening which is spaced from the bottom wall and has a reduced inner diameter; the ball sealer is arranged in the connecting pipe, and the diameter of the ball sealer is larger than the inner diameter of the end of the air inlet conical opening; the liquid sample is distributed in the second internal space, and when the shell is inverted with the top wall facing downwards and the bottom wall facing upwards, the liquid level of the shell is lower than the air inlet conical opening; when the top wall of the shell is upward and the bottom wall of the shell is downward, the air inlet conical opening is sealed by the plugging ball so as to prevent a liquid sample from entering the connecting pipe; when the shell is inverted and the leakage hole is connected to a negative pressure source of an external vacuum system, the plugging ball is separated and opens the air inlet conical opening, and the liquid sample is vaporized and flows into the vacuum system.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage detection, in particular to a standard leakage hole device. Background Art

[0002] A standard leak is a device specially made for vacuum leak detection and calibration, which can provide a constant amount of known samples into the vacuum system under certain conditions. At present, the standard leaks are mainly divided into two categories: ① channel-type standard leaks, including flat metal tubes, glass capillary-type holes, etc. as their leak channels; ② permeation-type standard leaks, using film permeation-type holes as their leak channels. The standard leak has the functions of calibrating the sensitivity of leak detection instruments, calibrating the size of detected leaks, measuring the pumping speed of vacuum pumps, and calibrating vacuum gauges.

[0003] When the standard leak device is placed inside a vacuum system or connected to a vacuum system and the negative pressure in the vacuum system is turned on, the gaseous or liquid sample contained in the standard leak leaks out of the channel leak due to the negative pressure, or seeps out of the film permeation leak, and flows into the vacuum system at a constant flow rate; among them, the leak containing the gaseous sample can be used under atmospheric pressure or negative pressure; the leak containing the liquid sample is used under negative pressure, and when the pressure of the use environment decreases, the liquid standard sample vaporizes, leaks out of the channel leak, or seeps out of the film leak.

[0004] like Figure 1 , 2 As shown, the conventional standard leak device contains liquid sample 5, gas C and thin film or channel leak in the same housing internal space A. During storage and use, boiling or crystallized liquid sample B is inevitably in direct contact with the thin film or channel leak. For a channel leak, direct contact of the liquid sample with the leak will cause the liquid sample to crystallize under negative pressure and block the channel leak, affecting the leakage accuracy and service life of the standard leak; for a thin film leak, crystallization of the liquid sample on the membrane surface will also block the thin film leak and affect the leakage accuracy. If the liquid sample is corrosive to the thin film, long-term direct contact with the thin film will cause corrosion and damage to the thin film, reducing the service life of the standard leak. Utility Model Content

[0005] The utility model provides a standard leak device to solve the technical problem that the liquid sample and the film or channel leak of the standard leak device in the prior art are in the same space, resulting in direct contact between the liquid sample and the leak, which affects the leakage accuracy and service life of the device.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is:

[0007] The utility model provides a standard leak hole device, comprising:

[0008] A shell, the top wall of which is provided with a leakage hole;

[0009] A partition plate is disposed inside the shell and divides the inside of the shell into a first internal space between the partition plate and the top wall and a second internal space between the partition plate and the bottom wall of the shell;

[0010] A connecting pipe is arranged in the second internal space and one end of which passes through the partition plate, and the other end of which is an air intake cone with a reduced inner diameter and spaced from the bottom wall;

[0011] A sealing ball is placed inside the connecting pipe and has a diameter larger than the inner diameter of the end of the air inlet cone;

[0012] The liquid sample is distributed in the second internal space, and when the housing is inverted with the top wall facing downward and the bottom wall facing upward, the liquid level is lower than the air inlet cone;

[0013] When the shell is placed upright with the top wall facing upward and the bottom wall facing downward, the blocking ball closes the air inlet cone to prevent the liquid sample from entering the connecting pipe;

[0014] When the shell is inverted and the leak hole is connected to the negative pressure source of the external vacuum system, the blocking ball is detached and the air inlet cone is opened, and the liquid sample is vaporized and flows into the vacuum system.

[0015] Furthermore, the standard leak device also includes:

[0016] The barrier net is fixedly installed inside the connecting pipe;

[0017] The blocking ball is movably placed inside the connecting pipe and between the blocking net and the air inlet cone;

[0018] When the shell is inverted, the blocking balls are supported on the barrier net due to gravity.

[0019] Preferably, the partition plate is provided with an air vent, one end of the connecting tube is an air outlet end connected to the air vent and passes through the air vent, the other end of the connecting tube spaced apart from the bottom wall is an air inlet end, the end of the air inlet end away from the air outlet end is an air inlet cone opening with an inner diameter gradually decreasing in the direction away from the air outlet end, and the end of the air outlet end away from the air inlet end is an air outlet cone opening with an inner diameter gradually decreasing in the direction away from the air inlet end.

[0020] Furthermore, the standard leak device also includes:

[0021] The breathable membrane is fixedly installed inside the connecting pipe and divides the inner space of the connecting pipe into an air outlet space connected to the first inner space and an air inlet space connected to the second inner space.

[0022] Preferably, the breathable membrane is fixedly installed inside the connection portion of the connecting pipe corresponding to the air inlet end and the air outlet end.

[0023] Preferably, the leakage hole is a sieve hole of a molecular sieve, a capillary pore of a capillary tube, a membrane hole of a permeable membrane, or a single hole arranged on the top wall.

[0024] Preferably, the shell, partition plate and connecting pipe are made of stainless steel, the sealing balls are iron balls, stainless steel balls, aluminum alloy balls or glass balls, and the barrier net is welded or connected to the inside of the connecting pipe through a snap-fit ​​structure.

[0025] Furthermore, the standard leak device also includes:

[0026] The supporting foot pad is arranged on the top surface of the top wall facing away from the bottom wall.

[0027] Preferably, the liquid sample is an electrolyte, an acetone solution, a formaldehyde solution, a methanol solution or an ethanol solution.

[0028] Preferably, the vacuum system is a vacuum negative pressure gauge, a vacuum gauge or a vacuum pump.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The standard leak device provided by the utility model realizes gas-liquid separation inside the shell of the standard leak device by changing the spatial structure inside the shell of the standard leak device, alleviates the volatilization of liquid samples when the shell is upright, and is conducive to long-term storage. When the shell is inverted, the device is connected to the negative pressure of the vacuum system to perform detection operations, and solves the problem that when the standard leak device is connected to negative pressure, the boiling or crystallized liquid sample directly contacts the leak hole, causing crystallization leak hole blockage or membrane corrosion at the leak hole, thereby improving the leakage accuracy, service life and application range of the standard leak device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution proposed by the utility model, the utility model is described in detail in combination with the embodiments and drawings. It should be understood that the embodiments and drawings described in the following specific implementation methods and the drawings in the specification are only some embodiments of the utility model, and for ordinary technicians in this field, these drawings can be changed under the concept of the utility model.

[0032] Figure 1 It is a schematic diagram of the internal gas-liquid distribution state of the existing standard leak device under normal pressure environment;

[0033] Figure 2 It is a schematic diagram of the internal gas-liquid leakage state of the existing standard leak device under a negative pressure environment;

[0034] Figure 3 This is a schematic diagram of the internal gas-liquid distribution state of the standard leak device provided by the utility model when it is placed upright and under normal pressure;

[0035] Figure 4A schematic diagram of the internal gas-liquid distribution state of the standard leak device provided by the utility model when it is inverted and under normal pressure;

[0036] Figure 5 for Figure 4 Schematic diagram of the internal gas-liquid leakage state of the inverted standard leak device under negative pressure environment.

[0037] Among them, the main marks of the drawings in the figure are as follows:

[0038] 1. Shell; 11. Top wall; 111. Leakage hole; 12. Bottom wall; 13. Side wall; 2. Partition plate; 21. Vent hole; 3. Connecting pipe; 31. Air inlet end; 311. Air inlet cone; 32. Air outlet end; 321. Air outlet cone; 4. Sealing ball; 5. Liquid sample; 6. Barrier net; 7. Breathable membrane; 8. Support foot pad.

[0039] Among them, the other marks in the figure are as follows:

[0040] A, internal space of the shell; B, boiling or crystallizing liquid sample; C, gas; D, first internal space; E, second internal space; F, constant leakage; H, cone mouth height; h, liquid level height. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 3-5 And embodiments, the utility model is further described in detail.

[0042] Please also read Figure 3-5 The standard leak device provided by the utility model comprises:

[0043] A housing 1, wherein a leak hole 111 is provided on a top wall 11 of the housing 1, a bottom wall 12 of the housing 1 opposite to the top wall 11 and a side wall 13 connected between the top wall 11 and the bottom wall 12 are closed, and the top wall 11, the side wall 13 and the bottom wall 12 form an internal accommodation space of the housing 1; a partition plate 2 is provided in the internal accommodation space of the housing 1 and is located between the top wall 11 and the bottom wall 12 of the housing 1 opposite to the top wall 11, and divides the internal accommodation space of the housing 1 into a first internal space D located between the partition plate 2 and the top wall 11, and a second internal space E located between the partition plate 2 and the bottom wall 12 of the housing 1; a vent hole 2 1, arranged on the partition plate 2; a connecting pipe 3, arranged in the second internal space E, and one end of the connecting pipe 3 is connected to the vent hole 21 so as to penetrate the partition plate 2, and the other end of the connecting pipe 3 is an air inlet cone 311 which is spaced from the bottom wall 12 and has a reduced inner diameter at the end; a blocking ball 4, which can be movably accommodated in the connecting pipe 3, and the diameter of the blocking ball 4 is larger than the inner diameter of the end of the air inlet cone 311; a liquid sample 5, distributed in the second internal space E, and when the shell 1 is inverted with the top wall 11 facing downward and the bottom wall 12 facing upward, the liquid level height h of the liquid sample 5 is lower than the cone height H of the air inlet cone 311;

[0044] See also Figure 3 When the housing 1 is placed upright with the top wall 11 facing upward and the bottom wall 12 facing downward, the blocking ball 4 presses down and closes the air inlet cone 311 under the action of gravity to prevent the liquid sample 5 from entering the connecting pipe 3 from the second internal space E; at this time, the standard leak hole 111 device can be placed inside a vacuum system (not shown in the figure) with negative pressure not turned on (i.e., in a normal pressure state) or stored outside the vacuum system under a normal pressure state, and the standard leak hole 111 device is in a storage state where the air inlet cone 311 is closed by the blocking ball 4 and the liquid sample 5 slowly evaporates under a normal pressure environment. In addition, when the housing 1 is placed upright, the blocking ball 4 blocks the inner hole of the air inlet cone 311 at the lower end of the connecting pipe due to the action of gravity, while isolating the liquid sample 5 in the second internal space E, it also reduces the leakage rate of the gaseous sample formed by the volatilization and vaporization of the liquid sample 5 in the housing 1, so as to increase the service life of the standard leak hole 111 device.

[0045] See also Figure 4 , 5When the shell 1 is inverted with the top wall 11 facing downward and the bottom wall 12 facing upward and the leak hole 111 is connected to the negative pressure source of the external vacuum system so that the standard leak hole 111 device performs the test, the blocking ball 4 is separated from the air intake cone 311 under the action of gravity and opens the air intake cone 311. The liquid sample 5 is vaporized under the action of negative pressure and leaks through the air intake cone 311, the inside of the connecting pipe 3, the first internal space D and the leak hole 111 in a constant flow rate of gas C and flows into the vacuum system. During this process, boiling or crystallized liquid sample B will still be produced in the internal accommodation space of the shell 1, but due to the obstruction of the gas C transmission path composed of the connecting tube 3 (the sealing ball 4 at the air inlet cone 311, the inside of the connecting tube 3) and the first internal space D, the connecting tube 3 achieves a gas-liquid separation effect in which only the gas C is connected between the first internal space D and the second internal space E, while the liquid phase is blocked. Therefore, at this time, the liquid sample 5 (i.e., the boiling or crystallized liquid sample B) that is splashed, lifted or crystallized due to boiling and suction in the internal accommodation space of the shell 1 cannot pass through the first internal space D to directly contact the leakage hole 111, thereby avoiding direct contact of the liquid sample 5 to cause it to crystallize under negative pressure and block the film or channel leakage hole 111, thereby improving the leakage accuracy and service life of the standard leakage hole 111 device.

[0046] To sum up, that is, whether the standard leak hole 111 device is upright or inverted, the liquid sample 5 in the second internal space E and the connecting tube 3 will not enter the first internal space D and will not directly contact the leak hole 111. However, when the leak hole 111 is connected to the negative pressure source of the external vacuum system, the gaseous sample formed by the volatilization and vaporization of the liquid sample 5 stored in the second internal space E can exist in the first internal space D and the second internal space E at the same time, so that the internal accommodating space of the shell 1 of the standard leak hole 111 device is separated by the partition plate 2 and the connecting tube 3 to form two spaces, the first internal space D and the second internal space E, where only the gas C is connected but not the liquid. The standard leak hole 111 device is used for long-term storage of liquid samples when it is upright, and is used to perform the detection function of the standard leak hole 111 device for leakage of the vacuum system and the inflow of gas C.

[0047] Please also read Figure 3-5 In this embodiment, the standard leak hole 111 device further includes:

[0048] The barrier net 6 is fixedly installed inside the connecting tube 3; the blocking ball 4 can be movably accommodated inside the connecting tube 3 and is located between the barrier net 6 and the air inlet cone 311, that is, when the shell 1 is upright with the top wall 11 facing upwards and the bottom wall 12 facing downwards, the blocking ball 4 is pressed downwards and closes the air inlet cone 311 under the action of gravity; when the shell 1 is inverted with the top wall 11 facing downwards and the bottom wall 12 facing upwards, the blocking ball 4 is separated from and opens the air inlet cone 311 due to the action of gravity, and is supported on the barrier net 6.

[0049] Please also read Figure 3-5 In the present embodiment, the partition plate 2 is provided with an air vent 21, one end of the connecting pipe 3 is an air outlet end 32 connected to the air vent 21 and passing through the partition plate 2 through the air vent 21, and the other end of the connecting pipe 3 which is spaced apart from the bottom wall 12 is an air inlet end 31 which is away from the air outlet end 32 and the top wall 11, extends close to the bottom wall 12 and is spaced apart from the bottom wall 12, and the air inlet end 31 is in a tapered shape with an inner diameter gradually decreasing from the tail of the air inlet end 31 close to the air outlet end 32 and the top wall 11 (at the same time away from the bottom wall 12) to the end of the air inlet end 31 away from the air outlet end 32 and the top wall 11 (at the same time close to the bottom wall 12), that is, the end of the air inlet end 31 away from the air outlet end 32 (at the same time away from the top wall 11) is in a direction away from the air outlet end 32 and the top wall 11 (at the same time close to the bottom wall 12), and the inner diameter gradually decreases, and the air inlet cone 311 is connected to the interior of the connecting pipe 3 and the second internal space E.

[0050] Please also read Figure 3-5 As a preferred implementation manner of this embodiment, the air outlet end 32 is in a tapered shape with an inner diameter gradually decreasing from the tail end close to the air inlet end 31 and the bottom wall 12 (and away from the top wall 11) to the end away from the air inlet end 31 and the bottom wall 12 (and close to the top wall 11), that is, the end of the air outlet end 32 away from the air inlet end 31 (and away from the bottom wall 12) is an air outlet cone 321 with an inner diameter gradually decreasing in the direction away from the air inlet end 31 and the bottom wall 12 (and close to the top wall 11), and the connection between the tail end of the air inlet end 31 and the tail end of the air outlet end 32 is the largest inner diameter part of the connecting pipe 3.

[0051] See also Figure 4 , 5 In the standard leak hole 111 device provided by the utility model, when the shell 1 is inverted and the leak hole 111 is connected to the negative pressure source generated by the external vacuum system, the liquid sample 5 stored in the second internal space E is vaporized under the action of negative pressure, and the gas C is transmitted and leaked to the vacuum system through the path composed of the second internal space E, the connecting pipe 3 (the air inlet cone 311, the air inlet end 31, the air permeable membrane 7, the air outlet end 32, the air outlet cone 321), the vent 21, the first internal space D, the leak hole 111 and the external vacuum system. Compared with the traditional standard leak hole 111 device using the liquid sample 5 and the thin film The membrane leak hole 111 or the channel leak hole 111 is arranged in the same space, and a connecting pipe 3 with a smaller inner diameter tube hole and a tapered mouth at both ends of the air inlet and outlet and other transition transmission paths of the first internal space D are added. The air pressure change in the internal accommodating space of the shell 1 can be buffered during the process of negative pressure extraction by the external vacuum system. When the leak hole 111 adopts a thin film type leak hole, a sudden drop in air pressure (too fast drop) at the thin film type leak hole can be avoided, so as to reduce the probability of the thin film (permeable membrane) being ruptured or damaged due to repeated sudden changes in air pressure when repeatedly connected to a negative pressure source, thereby increasing the service life of the thin film type leak hole.

[0052] Please also read Figure 3-5 In this embodiment, the standard leak hole 111 device further includes:

[0053] The air-permeable membrane 7 is fixedly installed inside the connecting pipe 3 and divides the space inside the connecting pipe 3 into an air outlet space connected to the first internal space D and an air inlet space connected to the second internal space E.

[0054] As a preferred implementation of this embodiment, the breathable membrane 7 is fixedly installed inside the connection point (i.e. the point where the inner diameter of the connecting pipe 3 is the largest) corresponding to the tail of the air inlet end 31 and the tail of the air outlet end 32 of the connecting pipe 3.

[0055] In this embodiment, according to different liquid samples used in the standard leak hole 111 device in different application scenarios, the leak hole 111 can be a channel-type leak hole (such as the sieve holes of a molecular sieve or mesh screen, the capillary holes of a capillary tube, the inner holes of a metal tube, or a single hole or multiple holes opened on the top wall 11) or a film-type leak hole (such as the film holes of a permeable membrane). In order to avoid the permeable membrane as a film-type leak hole being broken or damaged due to changes in air pressure when negative pressure is frequently introduced from an external vacuum system, the leak hole 111 preferably adopts a channel-type leak hole to increase the service life of the leak hole 111.

[0056] In this embodiment, according to different liquid samples used in the standard leak hole 111 device in different application scenarios, the breathable membrane 7 adopts a permeable membrane. The permeable membrane (breathable membrane 7) can block some liquid macromolecules such as water molecules in the air inlet space in the connecting pipe 3 and the second internal space E in the housing 1, while allowing the gaseous sample molecules of the liquid sample 5 (such as electrolyte) to be volatilized and vaporized under the negative pressure environment to penetrate into the air outlet space of the connecting pipe 3 through the membrane pores of the permeable membrane, and continue to flow into the vacuum system from the vent 21, the first internal space D and the leak hole 111 in sequence. The film of the thin film leak hole (when the leak hole 111 is a thin film leak hole) and the breathable membrane 7 preferably adopt PDMS membrane, and other types of permeable membranes can also be used. The setting of the breathable membrane 7 further reduces the probability of the liquid sample directly contacting the leak hole 111 through the connecting pipe 3, the vent 21 and the first internal space D, and improves the leakage accuracy and service life of the standard leak hole 111.

[0057] In this embodiment, the liquid sample 5 is a volatile liquid such as an electrolyte, an acetone solution, a formaldehyde solution, a methanol solution or an ethanol solution.

[0058] In this embodiment, according to different liquid samples used in the standard leak hole 111 device in different application scenarios, the shell 1, partition plate 2 and connecting tube 3 can be made of stainless steel or other corrosion-resistant metals or alloys that are not easily deformed when working in a negative pressure environment.

[0059] In this embodiment, the blocking ball 4 is made of a material that is insoluble in the liquid sample and has a high density, so that when the housing 1 is placed upright or inverted, the blocking ball 4 can move up and down and left and right in the connecting tube 3 under the action of gravity to press and close or disengage and open the air inlet cone 311. The blocking ball 4 is preferably an iron ball, a stainless steel ball, an aluminum alloy ball or a glass ball.

[0060] In this embodiment, the barrier net 6 is welded and fixedly connected to the inside of the connecting tube 3, or is detachably connected to the inside of the connecting tube 3 through a snap-fit ​​structure (not shown in the figure), and the snap-fit ​​connection is sealed with a sealing ring (not shown in the figure) to prevent the liquid sample from entering or passing through. The barrier net 6 can also be fixedly connected to the inner wall of the connecting tube 3 and then welded and sealed on the outside of the connection.

[0061] In this embodiment, the breathable membrane 7 is detachably connected to the inside of the connecting tube 3 via a snap-fit ​​structure (not shown in the figure), and the snap-fit ​​connection is then sealed with a sealing ring (not shown in the figure) to prevent the liquid sample from entering or passing through, or the breathable membrane 7 is fixedly connected to the inner wall of the connecting tube 3 and then welded and sealed on the outside of the connection.

[0062] Please also read Figure 3-5 In this embodiment, the standard leak hole 111 device further includes:

[0063] The support pad 8 is disposed on the top surface of the top wall 11 facing away from the bottom wall 12 .

[0064] Please also read Figure 3-5 As a preferred implementation of this embodiment, a plurality of support pads 8 are evenly spaced and distributed on the top surface of the top wall 11 facing away from the bottom wall 12 .

[0065] See also Figure 3 When the standard leak hole 111 device is built into a vacuum system where the negative pressure is not turned on (i.e., it is in a normal pressure state) or is stored outside the vacuum system, and the housing 1 is placed on the support surface inside the vacuum system, the support foot pad 8 does not contact the support surface inside the vacuum system, and the standard leak hole 111 device is in a storage state where the air inlet cone 311 is closed by the blocking ball 4 and the liquid sample 5 evaporates slowly;

[0066] See also Figure 4 , 5 , when the standard leak hole 111 device is built into a vacuum system with negative pressure turned on (i.e., in a negative pressure state) for testing and use, and when the shell 1 is inverted on the support surface inside the vacuum system, the support foot pad 8 is in contact with the support surface inside the vacuum system, so that the leak hole 111 provided on the top wall 11 (at this time, the shell 1 is in an inverted posture with the top wall 11 facing downward and the bottom wall 12 facing upward) maintains a certain height distance from the support surface inside the vacuum system due to the elevation effect of the support foot pad 8, thereby avoiding the leak hole 111 from directly contacting the support surface inside the vacuum system to affect the gas C from flowing out of the leak hole 111 and entering the vacuum system.

[0067] In this embodiment, the vacuum system is a vacuum negative pressure gauge, a vacuum gauge or a vacuum pump. When in use, the standard leak hole 111 device can be placed inside the vacuum system or sealed and docked with the gas C inlet of the vacuum system to be tested. After the negative pressure source generated by the closed vacuum system is connected to the internal accommodation space of the shell 1 of the standard leak hole 111 device through the leak hole 111, the leak hole 111 can leak the gas C with a constant flow (i.e., the constant leakage F of the gaseous sample) and flow into the vacuum system, and then the corresponding stable leakage intensity is measured by the relevant detection instrument, so that the standard leak hole 111 device can perform vacuum system and instrument detection and calibration operations such as calibrating the sensitivity of the leak detection instrument, calibrating the size and leakage of the leak hole 111, measuring the pumping speed of the vacuum pump and calibrating the vacuum gauge. Among them, the constant pumping speed of the external vacuum system is mainly combined with the fixed size of the channel leak hole 111 or the fixed permeability of the film leak hole 111 to ensure that the leak hole 111 achieves a constant leakage F of the vacuum system.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art should understand that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A standard leak device, characterized in that: include: A housing (1), the top wall (11) of which is provided with a leakage hole (111); A partition plate (2) is arranged inside the shell (1) and divides the inside of the shell (1) into a first internal space (D) located between the partition plate (2) and the top wall (11) and a second internal space (E) located between the partition plate (2) and the bottom wall (12) of the shell (1); A connecting pipe (3) is arranged in the second internal space (E) and one end of which passes through the partition plate (2), and the other end of which is an air intake cone (311) spaced from the bottom wall (12) and having a reduced inner diameter at the end; A sealing ball (4) is placed inside the connecting pipe (3) and has a diameter larger than the inner diameter of the end of the air inlet cone (311); The liquid sample (5) is distributed in the second internal space (E), and when the housing (1) is inverted with the top wall (11) facing downward and the bottom wall (12) facing upward, the liquid level height (h) is lower than the air inlet cone (311); When the housing (1) is upright with the top wall (11) facing upward and the bottom wall (12) facing downward, the blocking ball (4) closes the air inlet cone (311) to prevent the liquid sample (5) from entering the connecting pipe (3); When the housing (1) is inverted and the leak hole (111) is connected to a negative pressure source of an external vacuum system, the blocking ball (4) is detached and the air inlet cone (311) is opened, and the liquid sample (5) is vaporized and flows into the vacuum system.

2. The standard leak device according to claim 1, characterized in that: Also includes: A barrier net (6) is fixedly installed inside the connecting pipe (3); The blocking ball (4) is movably disposed inside the connecting pipe (3) and between the blocking net (6) and the air inlet cone (311); When the shell (1) is inverted, the blocking balls (4) are supported on the barrier net (6) due to gravity.

3. The standard leak device according to claim 1, characterized in that: The partition plate (2) is provided with a vent hole (21); one end of the connecting pipe (3) is an air outlet end (32) connected to the vent hole (21) and passing through the partition plate (2) through the vent hole (21); the other end of the connecting pipe (3) spaced apart from the bottom wall (12) is an air inlet end (31); the end of the air inlet end (31) away from the air outlet end (32) is an air inlet cone opening (311) whose inner diameter gradually decreases in a direction away from the air outlet end (32); and the end of the air outlet end (32) away from the air inlet end (31) is an air outlet cone opening (321) whose inner diameter gradually decreases in a direction away from the air inlet end (31).

4. The standard leak device according to claim 3, characterized in that: Also includes: The air-permeable membrane (7) is fixedly installed inside the connecting pipe (3) and divides the space inside the connecting pipe (3) into an air outlet space connected to the first internal space (D) and an air inlet space connected to the second internal space (E).

5. The standard leak device according to claim 4, characterized in that: The air permeable membrane (7) is fixedly mounted inside the connection portion of the connecting pipe (3) corresponding to the air inlet end (31) and the air outlet end (32).

6. The standard leak device according to any one of claims 1 to 5, characterized in that: The leakage hole (111) is a sieve hole of a molecular sieve, a capillary pore of a capillary tube, a membrane pore of a permeable membrane, or a single hole arranged on the top wall (11).

7. The standard leak device according to claim 2, characterized in that: The shell (1), the partition plate (2) and the connecting pipe (3) are made of stainless steel, the blocking balls (4) are iron balls, stainless steel balls, aluminum alloy balls or glass balls, and the barrier net (6) is welded or connected to the inside of the connecting pipe (3) through a snap-fit ​​structure.

8. The standard leak device according to any one of claims 1 to 5, characterized in that: Also includes: A supporting foot pad (8) is arranged on the top surface of the top wall (11) facing away from the bottom wall (12).

9. The standard leak device according to any one of claims 1 to 5, characterized in that: The liquid sample (5) is an electrolyte, an acetone solution, a formaldehyde solution, a methanol solution or an ethanol solution.

10. The standard leak device according to any one of claims 1 to 5, characterized in that: The vacuum system is a vacuum negative pressure gauge, a vacuum gauge or a vacuum pump.

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