Detection bin for helium leakage detection equipment

Abstract

The utility model discloses a detection bin of helium leakage detection equipment. The detection bin comprises a bin box, a bin cover, a detection cavity, an annular gap and a through hole. The bin cover is connected with the opening end of the bin box. The detection cavity is formed between the bin box and the bin cover and used for containing a to-be-detected piece. The sealing assembly comprises an inner sealing ring and an outer sealing ring which are arranged between the bin box and the bin cover. An annular gap is formed between the bin box, the bin cover, the inner sealing ring and the outer sealing ring and surrounds an opening of the open end of the bin box. The through hole is formed in the bin cover or the bin box and communicated with the annular gap to serve as an air inflation hole or an air exhaust hole. According to the detection bin, air can be effectively prevented from entering the detection bin, and the accuracy and reliability of the final detection result of the helium leakage detection equipment are ensured, so that the detection precision of the helium leakage detection equipment is improved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of helium leak detection equipment, and more specifically, the utility model relates to a detection chamber for helium leak detection equipment. Background Art

[0002] In the general field of machinery, with the continuous development of industrial technology and the improvement of product quality, the requirements for the sealing of various equipment and parts are becoming higher and higher. This high sealing requirement is not only related to the performance and reliability of the product, but also directly affects the production safety and service life. Therefore, strict testing of sealing has become an indispensable link in the manufacturing process.

[0003] When using the helium leak detection equipment, the part to be detected (such as a valve body) needs to be placed in its detection chamber, and then a vacuum environment is created in the detection chamber and helium is filled into the part to be detected using the inflator of the helium leak detection equipment. If helium leaks from the part to be detected into the detection chamber, the helium mass spectrometer leak detector of the helium leak detection equipment can capture and measure the leakage, thereby realizing the airtightness test of the part to be detected.

[0004] The existing testing chamber generally consists of a chamber box and a chamber cover detachably mounted on the chamber box, so that the test piece can be smoothly placed in the testing chamber. Although a traditional seal is provided between the chamber cover and the chamber box to seal the joint between the two, the internal air pressure of the testing chamber is extremely low when in use, so the traditional seal cannot achieve a relatively reliable seal, which easily causes helium-containing air to enter the testing chamber and interfere with the helium leak detection of the helium mass spectrometer leak detector, thereby reducing the accuracy and precision of the detection results of the helium leak detection equipment. Utility Model Content

[0005] In order to solve one or more of the technical problems mentioned above, the utility model provides a detection chamber for a helium leak detection device, which can effectively prevent air from entering the detection chamber and ensure that the final detection result of the helium leak detection device is accurate and reliable, thereby improving the detection accuracy of the helium leak detection device.

[0006] The utility model provides a detection chamber for helium leak detection equipment, which comprises:

[0007] Warehouse box;

[0008] A bin cover connected to the open end of the bin box;

[0009] A detection cavity, which is formed between the bin box and the bin cover and is used to accommodate the part to be detected;

[0010] A sealing assembly, comprising an inner sealing ring and an outer sealing ring disposed between the bin box and the bin cover;

[0011] an annular gap formed between the bin, the bin cover, the inner sealing ring and the outer sealing ring and surrounding an opening of the open end of the bin; and

[0012] A through hole is provided on the bin cover or the bin box and is connected to the annular gap to serve as an air filling hole or an air extraction hole.

[0013] Through the detection chamber provided as above, the protective gas that does not contain helium is sent into the annular gap by using the through hole as the inflation hole, so that the air pressure in the annular gap is greater than the atmospheric pressure. The protective gas can effectively prevent the outside air from entering the detection cavity through the annular gap. Even if the protective gas accidentally enters the detection cavity through the inner sealing ring, since it does not contain helium and the amount entering is extremely limited, it will not cause a substantial impact on the helium leakage detection of the helium mass spectrometer leak detector, which is conducive to ensuring the accuracy and reliability of the final detection result of the helium leak detection equipment, thereby improving the detection accuracy of the helium leak detection equipment.

[0014] In addition, the through hole is used as an air extraction hole to discharge the gas in the annular gap, so that the air pressure in the annular gap is lower than the air pressure in the detection chamber. In this case, even if the outside air enters the annular gap through the outer sealing ring, the air can be extracted by the air extraction hole, preventing the outside air from entering the detection chamber through the annular gap, and avoiding the substantial impact of the air on the helium leak detection of the helium mass spectrometer leak detector, which is conducive to ensuring the accuracy and reliability of the final detection result of the helium leak detection equipment, thereby improving the detection accuracy of the helium leak detection equipment.

[0015] Furthermore, the detection bin also includes a plurality of bolts, each of which passes through the bin cover and is screwed into a corresponding internal thread provided on the bin box, and each of the bolts is arranged to have an opening that is farther away from the open end of the bin box than the outer sealing ring.

[0016] Furthermore, the inner sealing ring and the outer sealing ring are both O-rings.

[0017] Furthermore, the bin box and / or the bin cover are provided with a first clamping groove for limiting the outer sealing ring and a second clamping groove for limiting the inner sealing ring.

[0018] Furthermore, the distance between the inner sealing ring and the outer sealing ring between the bin cover and the bin box is greater than the diameter of the through hole.

[0019] Furthermore, the bin box is supported by stainless steel or aluminum, and the bin cover is made of aluminum.

[0020] Furthermore, the protective gas is nitrogen, carbon dioxide, hydrogen or argon.

[0021] Furthermore, reinforcing ribs arranged in a staggered manner are provided on the outer surface of the bin box and / or the bin cover.

[0022] Furthermore, the helium leak detection device also includes an inflation component that seals through the box wall of the warehouse box and is used to inflate helium into the part to be detected. The warehouse box is provided with a helium detection interface for connecting to a helium mass spectrometer leak detector of the helium leak detection device.

[0023] Furthermore, the tank is provided with a negative pressure interface for connecting to a vacuum pump of the helium leak detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 A schematic diagram of the structure of a detection chamber and an inflation component for a helium leak detection device provided by an embodiment of the utility model is shown;

[0026] Figure 2 A side view of a storage box provided by an embodiment of the utility model is shown;

[0027] Figure 3 It shows a schematic diagram of the structure of the bin cover provided by the embodiment of the utility model;

[0028] Figure 4 Shows Figure 2 Cross-sectional view along the AA direction.

[0029] 1. Warehouse box; 11. Reinforcement ribs; 12. Helium detection interface; 13. Negative pressure interface;

[0030] 2. compartment cover; 21. first card slot; 22. second card slot;

[0031] 3. Detection cavity;

[0032] 4. Sealing assembly; 41. Inner sealing ring; 42. Outer sealing ring;

[0033] 5. Annular gap;

[0034] 6. Through hole;

[0035] 100. Inflatable component. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0037] Figure 1 FIG. 1 is a schematic diagram showing the structure of a detection chamber and an inflatable assembly 100 for a helium leak detection device provided by an embodiment of the utility model. Figure 1 As shown, the helium leak detection equipment includes a detection chamber, an inflatable component 100, a vacuum pump (not shown in the figure) and a helium mass spectrometer leak detector (not shown in the figure), and the inflatable component 100 is set to pass through the box wall of the chamber box 1 in a sealed manner, and can fill helium into the part to be detected. The chamber box 1 of the detection chamber is provided with a negative pressure interface 13 and a helium detection interface 12, the negative pressure interface 13 is used to connect the vacuum pump of the helium leak detection equipment, and the helium detection interface 12 is used to connect the helium mass spectrometer leak detector of the helium leak detection equipment. When in use, the part to be detected is placed in the detection chamber, and the air in the detection chamber is extracted and placed in a vacuum state by a vacuum pump connected to the negative pressure interface 13, and then the inflatable component 100 is used to fill helium into the part to be detected. If there is helium leakage in the part to be detected, it will flow into the detection cavity 3, and the helium mass spectrometer leak detector can detect the helium flowing into the detection cavity 3, so as to realize the use of helium to detect the air tightness of the part to be detected.

[0038] It should be noted that since both the vacuum pump and the helium mass spectrometer leak detector are prior arts well known to those skilled in the art, they will not be described in detail. This embodiment does not specifically limit the specific structure of the vacuum pump, and any vacuum pump that can achieve vacuuming and inflation is within the protection scope of the present embodiment. This embodiment does not specifically limit the specific structure of the helium mass spectrometer leak detector, and any helium mass spectrometer leak detector that can perform helium leak detection on the test piece is within the protection scope of the present embodiment.

[0039] Figure 2 FIG. 1 shows a side view of the storage box 1 provided in this embodiment. Figure 3 FIG. 2 shows a schematic diagram of the structure of the bin cover 2 provided in this embodiment. Figure 4 Shows Figure 2 The cross-sectional view along the AA direction. Figure 2-Figure 4As shown, the present embodiment also provides a detection chamber for helium leak detection equipment. The detection chamber includes a chamber box 1, a chamber cover 2, a detection chamber 3, a sealing assembly 4, an annular gap 5 and a through hole 6. The chamber cover 2 is connected to the open end of the chamber box 1, and the number of the chamber covers 2 is the same as the number of the open ends of the chamber box 1. The detection chamber 3 is formed between the chamber box 1 and the chamber cover 2, and is used to accommodate the parts to be detected. The sealing assembly 4 includes an inner sealing ring 41 and an outer sealing ring 42 arranged between the chamber box 1 and the chamber cover 2. The annular gap 5 is formed between the chamber box 1, the chamber cover 2, the inner sealing ring 41 and the outer sealing ring 42, and surrounds the opening of the open end of the chamber box 1. The through hole 6 is opened on the chamber cover 2 or the chamber box 1 and is connected to the annular gap 5. Among them, the through hole 6 is configured as follows: when the detection chamber is used to detect the part to be detected, it serves as an inflation hole to deliver the protective gas that does not contain helium into the annular gap 5, so that the air pressure in the annular gap 5 is greater than the air pressure in the detection chamber 3; or, when the detection chamber is used to detect the part to be detected, it serves as an exhaust hole to discharge the gas in the annular gap 5, so that the air pressure in the annular gap 5 is lower than the air pressure in the detection chamber 3.

[0040] Through the detection chamber provided as above, the protective gas that does not contain helium is sent into the annular gap 5 by using the through hole 6 as an inflation hole, so that the air pressure in the annular gap 5 is greater than the atmospheric pressure. The protective gas can effectively prevent the outside air from entering the detection chamber 3 through the annular gap 5. Even if the protective gas accidentally enters the detection chamber 3 through the inner sealing ring 41, since it does not contain helium and the amount of entry is extremely limited, it will not cause a substantial impact on the helium leakage detection of the helium mass spectrometer leak detector, which is conducive to ensuring the accuracy and reliability of the final detection result of the helium leak detection equipment, thereby improving the detection accuracy of the helium leak detection equipment.

[0041] In addition, the through hole 6 is used as an air extraction hole to discharge the gas in the annular gap 5, so that the air pressure in the annular gap 5 is lower than the air pressure in the detection chamber 3. In this case, even if the outside air enters the annular gap 5 through the outer sealing ring 42, the air can be extracted by the air extraction hole, thereby preventing the outside air from entering the detection chamber 3 through the annular gap 5 and avoiding the substantial influence of the air on the helium leakage detection of the helium mass spectrometer leak detector, which is conducive to ensuring the accuracy and reliability of the final detection result of the helium leak detection equipment, thereby improving the detection accuracy of the helium leak detection equipment.

[0042] Furthermore, the inspection bin may also include a plurality of bolts (not shown in the figure), each of which penetrates the bin cover 2 and is screwed into a corresponding internal thread provided on the bin box 1 to achieve a detachable connection between the bin box 1 and the bin cover 2. The thread structure can ensure that a more stable connection can be maintained after the bin cover 2 and the bin box 1 are installed together, so that the sealing of the bin box 1 and the bin cover 2 after the connection can be ensured on the basis of achieving a detachable connection between the bin box 1 and the bin cover 2. Each bolt is arranged to have an opening farther away from the open end of the bin box 1 than the outer sealing ring 42, so that outside air can be prevented from entering the annular gap 5 from the connection between the bolt and the corresponding internal thread, thereby ensuring good sealing between the bin box 1 and the bin cover 2.

[0043] In this embodiment, the bin box 1 is made of stainless steel or aluminum, and the bin cover 2 is made of aluminum. The good machinability and low outgassing properties of stainless steel and aluminum are utilized to prevent the bin box 1 and the bin cover 2 from releasing gas from the materials themselves, which may affect the accuracy of the helium leak detection equipment. Exemplarily, the stainless steel material may be 304L stainless steel or 316L stainless steel, and the aluminum material may be an aluminum alloy. In other embodiments, the bin box 1 and the bin cover 2 may also be made of other materials with good machinability and low outgassing properties. This embodiment does not specifically limit the specific materials of the bin box 1 and the bin cover 2. All materials with low outgassing properties and good machinability are within the protection scope of the disclosed embodiments.

[0044] In this embodiment, staggered reinforcement ribs 11 are provided on the outer surface of the bin box 1 to enhance the support strength of the bin box 1. It should be noted that, in other embodiments, staggered reinforcement ribs 11 may also be provided on the outer surface of the bin cover 2 to enhance the support strength of the bin cover 2.

[0045] like Figure 3 As shown, in this embodiment, the inner sealing ring 41 and the outer sealing ring 42 are both O-shaped sealing rings. The characteristics of the O-shaped shape are utilized so that when the bin box 1 and the bin cover 2 are fitted, the O-shaped sealing ring can be deformed to fill the gap between the bin box 1 and the bin cover 2, thereby improving the sealing of the detection bin. In other embodiments, the inner sealing ring 41 and the outer sealing ring 42 can also be X-shaped sealing rings or square-shaped sealing rings, etc. This embodiment does not specifically limit this. Any sealing ring that can fit between the bin box 1 and the bin cover 2 to ensure the sealing of the two is within the protection scope of the disclosed embodiment.

[0046] like Figure 4As shown, in this embodiment, the first clamping groove 21 for limiting the outer sealing ring 42 and the second clamping groove 22 for limiting the inner sealing ring 41 are provided on the bin cover 2, so as to limit the displacement of the outer sealing ring 42 and the inner sealing ring 41 during the process of fitting the bin box 1 and the bin cover 2, prevent the outside air from entering the detection chamber 3, and further improve the sealing of the detection bin. In other embodiments, the first clamping groove 21 and the second clamping groove 22 can also be provided on the bin box 1, and this embodiment does not specifically limit this.

[0047] Furthermore, the distance between the inner sealing ring 41 and the outer sealing ring 42 between the bin cover 2 and the bin box 1 is greater than the diameter of the through hole 6 to prevent the through hole 6 from being partially blocked by the inner sealing ring 41 and the outer sealing ring 42 , thereby affecting the conduction performance of the through hole 6 .

[0048] In this embodiment, when the through hole 6 is used as a gas filling hole, the protective gas filled into the annular gap 5 is nitrogen, carbon dioxide, hydrogen or argon to prevent the filled gas from reacting with helium, thereby affecting the accuracy and precision of the detection results of the helium leak detection equipment. In other embodiments, the protective gas can also be other inert gases that do not contain helium and do not react with helium. This embodiment does not specifically limit this. All inert gases that do not contain helium and do not react with helium are within the protection scope of the disclosed embodiments.

[0049] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0050] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "upper" or "inner" and other terms indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present utility model.

[0051] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0052] Although multiple embodiments of the utility model have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted. The attached claims are intended to define the scope of protection of the utility model, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A detection chamber for helium leak detection equipment, characterized in that: The detection chamber comprises: Warehouse box (1); A bin cover (2) connected to the open end of the bin box (1); A detection chamber (3), which is formed between the bin box (1) and the bin cover (2) and is used to accommodate the object to be detected; A sealing assembly (4), comprising an inner sealing ring (41) and an outer sealing ring (42) arranged between the bin box (1) and the bin cover (2); an annular gap (5) formed between the bin box (1), the bin cover (2), the inner sealing ring (41) and the outer sealing ring (42), and surrounding the opening of the open end of the bin box (1); and A through hole (6) is provided on the bin cover (2) or the bin box (1) and is connected to the annular gap (5) to serve as an air filling hole or an air extraction hole.

2. The detection chamber according to claim 1, characterized in that: The inspection bin further comprises a plurality of bolts, each of which passes through the bin cover (2) and is screwed into a corresponding internal thread provided on the bin box (1), and each of the bolts is arranged to have an opening which is further away from the open end of the bin box (1) than the outer sealing ring (42).

3. The detection chamber according to claim 1, characterized in that: The inner sealing ring (41) and the outer sealing ring (42) are both O-type sealing rings.

4. The detection chamber according to claim 1, characterized in that: The bin box (1) and / or the bin cover (2) are provided with a first clamping groove (21) for restricting the outer sealing ring (42) and a second clamping groove (22) for restricting the inner sealing ring (41).

5. The detection chamber according to claim 1, characterized in that: The distance between the inner sealing ring (41) and the outer sealing ring (42) between the bin cover (2) and the bin box (1) is greater than the diameter of the through hole (6).

6. The detection chamber according to claim 1, characterized in that: The bin box (1) is made of stainless steel or aluminum, and the bin cover (2) is made of aluminum.

7. The detection chamber according to claim 1, characterized in that: When the through hole (6) is used as a gas filling hole, the protective gas filled into the annular gap (5) is nitrogen, carbon dioxide, hydrogen or argon.

8. The detection chamber according to claim 1, characterized in that: Staggered reinforcing ribs (11) are provided on the outer surface of the bin box (1) and / or the bin cover (2).

9. The detection chamber according to claim 1, characterized in that: The helium leak detection device further comprises an inflation component (100) which passes through the box wall of the box (1) in a sealed manner and is used to inflate helium into the object to be detected. The box (1) is provided with a helium detection interface (12) for connecting to a helium mass spectrometer leak detector of the helium leak detection device.

10. The detection chamber according to claim 1, characterized in that: The storage box (1) is provided with a negative pressure interface (13) for connecting to a vacuum pump of the helium leak detection equipment.

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