Detachable split type airtight tool and airtight test system

Abstract

The invention provides a detachable split type airtight tool and an airtight test system. The detachable split type airtight tool comprises a first end connecting piece, a second end connecting piece, an inner pressing ring, an outer pressing ring and a sealing piece. The outer pressing ring is detachably installed on the first end connecting piece, the inner pressing ring is detachably installed on the second end connecting piece, and the inner pressing ring is detachably connected with the outer pressing ring. The inner pressure ring and the outer pressure ring are encircled to form an accommodating space, and the accommodating space is used for accommodating a piece to be subjected to airtight test; air leakage detection holes are formed in the inner pressing ring and / or the outer pressing ring, and the containing space is communicated with the outside through the air leakage detection holes. A welding filler neck in the prior art is replaced, the cutting process of the welding filler neck is omitted, and the production efficiency is improved; the cutting process is not needed, so that the influence of redundant materials generated in the cutting process on the to-be-airtight test piece is avoided, and the quality of the to-be-airtight test piece is ensured.

Description

Technical Field

[0001] The present invention relates to the field of airtight testing, in particular, to a detachable split airtight tool and an airtight testing system, and in particular, to a detachable split system filter airtight tool for use in the field of space propulsion. Background Art

[0002] At present, the production cycle of system filters is relatively long. The front and rear shells are welded to ensure the sealing performance of the filter, and the filter needs to be tested for external leakage and airtightness. The filter can only be tested for airtightness by pressurizing the filter and performing helium mass spectrometry leak detection through a welding nozzle. The welding nozzle can only be discarded due to repeated cutting after use, which increases the production cost. The cutting process is prone to produce excess materials and easily causes the filter size to exceed the tolerance, causing quality risks. The introduction of welding and cutting processes leads to a long filter production cycle, affecting the filter production progress. Considering the high cost of filter production, long testing process, and reducing quality risks, this universal tooling is invented to simplify the operation process and improve product quality. Summary of the invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a detachable split airtight tooling and an airtight testing system.

[0004] A detachable split airtight tooling provided according to the present invention comprises a first end connecting piece, a second end connecting piece, an inner pressure ring, an outer pressure ring and a sealing piece;

[0005] The outer pressure ring is detachably mounted on the first end connector, the inner pressure ring is detachably mounted on the second end connector, and the inner pressure ring is detachably connected to the outer pressure ring; the inner pressure ring and the outer pressure ring are enclosed to form a receiving space, and the receiving space is used to receive the piece to be tested for airtightness;

[0006] The two ends of the piece to be tested for airtightness extend into the first end connector and the second end connector respectively, and a sealing member is installed between one end of the piece to be tested for airtightness and the first end connector, and between the other end of the piece to be tested for airtightness and the second end connector;

[0007] The first end connector and the second end connector are used to connect the airtight tooling to an external pipeline;

[0008] The inner pressure ring and / or the outer pressure ring is provided with a gas leakage detection hole, and the accommodating space is connected with the outside through the gas leakage detection hole.

[0009] Preferably, the first end connecting piece and the second end connecting piece are respectively a left end connecting piece and a right end connecting piece.

[0010] Preferably, the first end connecting piece and the second end connecting piece are both threaded joints.

[0011] Preferably, the inner pressure ring and the outer pressure ring are detachably connected via a threaded structure.

[0012] Preferably, the sealing element is an O-ring.

[0013] Preferably, the number of the O-rings is 4, two O-rings are sleeved on one side of the piece to be tested for airtightness, and the other two O-rings are sleeved on the other side of the piece to be tested for airtightness.

[0014] Preferably, the O-ring is made of soft polyvinyl chloride material.

[0015] Preferably, the first end connecting member and the second end connecting member have the same structure, both comprising a connecting portion and a limiting portion;

[0016] The connecting portion is a hollow structure, the end of the airtight test piece passes through the limiting portion and extends to the connecting portion, and the limiting portion is a step structure;

[0017] The limiting portion in the first end connecting piece and the limiting portion in the second end connecting piece are used for limiting the outer pressure ring and the inner pressure ring respectively.

[0018] Preferably, it further comprises a guide rod; the guide rod is detachably connected to both ends of the airtight test piece; the guide rod comprises a front part, a middle part, a rear part and an end;

[0019] The diameter of the front part is smaller than that of the rear part; the middle part is an intermediate transition arc, the diameter of the rear part matches the outer diameters of the two ends of the airtight test piece, and the diameter of the rear part matches the inner diameters of the two ends of the airtight test piece; the diameter of the end is smaller than the inner diameters of the first end connector and the second end connector;

[0020] O-ring grooves are arranged inside the first end connecting piece and the second end connecting piece.

[0021] An airtightness testing system provided by the present invention adopts the detachable split airtightness tooling and further includes a gas distribution platform, and the first end connector and the second end connector are connected to the pipeline of the gas distribution platform.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention replaces the welding nozzle in the prior art, omits the cutting process of the welding nozzle, and improves production efficiency; because the present invention does not need to perform a cutting process, it avoids the influence of the excess materials generated during the cutting process on the airtight test piece, that is, the state of the airtight test piece is not changed before and after the test, thereby ensuring the quality of the airtight test piece.

[0024] 2. The present invention is provided with a guide rod, which can avoid possible damage to the O-ring during the installation of the airtight test piece, thereby improving the accuracy of the airtight test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 is a schematic diagram of the structure of the filter;

[0028] Figure 3 is a schematic diagram of the structure of the guide rod;

[0029] Figure 4 Schematic diagram of the structure when the guide rod is in use.

[0030] The figure shows:

[0031] DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] The present invention provides a detachable split airtight tooling, such as Figure 1-Figure 2 As shown, it includes a first end connector 1, a second end connector 11, an inner pressure ring 2, an outer pressure ring 3 and a seal 5; in a preferred embodiment, the detachable split airtight tooling is a columnar structure. The airtight test piece is a filter 4.

[0034] The outer pressure ring 3 is detachably mounted on the first end connector 1, and the inner pressure ring 2 is detachably mounted on the second end connector 11. The inner pressure ring 2 and the outer pressure ring 3 are detachably connected. Specifically, the inner pressure ring 2 and the outer pressure ring 3 are detachably connected via a threaded structure, which has a locking function for the filter 4 after connection.

[0035] The inner pressure ring 2 and the outer pressure ring 3 together form a receiving space, and the receiving space is used to receive the piece to be tested for airtightness;

[0036] The two ends of the piece to be tested for airtightness extend into the first end connector 1 and the second end connector 11 respectively. A seal 5 is installed between one end of the piece to be tested for airtightness and the first end connector 1, and between the other end of the piece to be tested for airtightness and the second end connector 11. The first end connector 1 and the second end connector 11 are used to connect the airtight tooling with an external pipeline. A leakage detection hole is provided on the inner pressure ring 2 and / or the outer pressure ring 3, and the accommodating space is connected to the outside world through the leakage detection hole. The present invention uses the leakage detection hole to detect external leakage of the filter.

[0037] The first end connector 1 and the second end connector 11 are respectively the left end connector and the right end connector. The first end connector 1 and the second end connector 11 are both threaded joints. The sealing member 5 is an O-ring. The number of the O-rings is 4, 2 O-rings are mounted on one side of the piece to be tested for airtightness, and the other two O-rings are mounted on the other side of the piece to be tested for airtightness, to ensure the radial sealing of the filter. The O-rings are pressure-resistant and corrosion-resistant, and are made of soft polyvinyl chloride material. In other words, one end of the two threaded joints can be connected to the external pipeline (such as the gas distribution platform pipeline) through threads to achieve ventilation, and the other ends of the two threaded joints are matched to insert the inner pressure ring 2 and the outer pressure ring 3 respectively, and the radial sealing is achieved by cooperating with the filter through the O-ring; the threaded joint can be directly connected to the gas distribution platform through threads, and the filter can be pressed by pressure without welding the nozzle, which is convenient for loading and unloading.

[0038] The first end connector 1 and the second end connector 11 have the same structure, both including a connecting portion 12 and a limiting portion 13; the connecting portion 12 is a hollow structure, the end of the airtight test piece passes through the limiting portion 13 and extends to the connecting portion 12, and the limiting portion 13 is a step structure; the limiting portion 13 in the first end connector 1 and the limiting portion 13 in the second end connector 11 are respectively used to limit the outer pressure ring 3 and the inner pressure ring 2. In other words, the outer pressure ring 3 and the inner pressure ring 2 are respectively pressed against the step structure in the first end connector 1 and the step structure in the second end connector 11.

[0039] like Figure 3-4 As shown, the detachable split airtight tooling also includes a guide rod 6; the guide rod 6 is detachably connected to both ends of the airtight test piece; the guide rod 6 includes a front portion 61, a middle portion 62, a rear portion 63 and a terminal 64; the diameter of the front portion 61 is smaller than the rear portion 63; the middle portion 62 is an intermediate transition arc, the diameter of the rear portion 63 matches the outer diameters of the two ends of the airtight test piece, and the diameter of the rear portion 63 matches the inner diameters of the two ends of the airtight test piece; the diameter of the terminal 64 is smaller than the inner diameters of the first end connector 1 and the second end connector 11. The first end connector 1 and the second end connector 11 are both provided with O-ring grooves inside.

[0040] When the airtight test piece is installed into the disassembly split airtight tooling, the O-ring is pre-installed in the O-ring groove, and then Figure 4 As shown, the guide rod 6 is installed at the end of the piece to be tested for airtightness. After the end of the piece to be tested for airtightness is loaded into the first end connector 1 or the second end connector 11, it is pulled out from the end of the first end connector 1 or the second end connector 11 away from the inner pressure ring 2. The reason for setting the guide rod 6 is that the end chamfer 7 of some pieces to be tested for airtightness (such as filters) is very sharp. If there is no guide tube, the sharp end chamfer 7 may damage the O-ring located in the O-ring groove during the process of loading the piece to be tested for airtightness. The design of the guide tube can avoid the sharp end chamfer 7 from contacting, and the design of the middle part 62 as an intermediate transition arc can more smoothly guide the loading of the piece to be tested for airtightness. The above process and principle can also be understood as follows: the end of the guide rod is assembled with the filter outlet to ensure that the filter can support the guide rod, and the threaded joint is gradually pushed in until the assembly is completed and reaches the limit point, and the guide rod is directly withdrawn; the middle section of the guide rod adopts a slope design to ensure a smooth transition when the guide rod contacts the O-ring during the pushing process: 2 sealing rings are designed in the threaded joint to ensure the test sealing performance. If the filter outlet is directly installed, the sharp edge of the end face is easy to cut the O-ring. The assembly of the other side of the filter and the threaded joint is similar.

[0041] In a preferred example, the first end connector 1, the second end connector 11, the inner pressure ring 2 and the outer pressure ring 3 are all made of stainless steel, which has excellent chemical corrosion resistance and can be cleaned with various cleaning liquids to ensure the cleanliness of the device itself. In addition, they have good impact toughness, wear resistance and fatigue resistance, which can ensure that the device will not wear out during long-term use, and have high economic efficiency and low procurement cost.

[0042] The design that the outer pressure ring 3 is detachably connected to the first end connector 1, and the design that the inner pressure ring 2 is detachably connected to the second end connector 11, enables the present invention to adapt to the gas-tight test pieces (such as filters) with different pipe orifice specifications, and the operation is simple and the sealing is reliable. That is, when it is necessary to adapt to the gas-tight test pieces (such as filters) with different pipe orifice specifications, the first end connector 1 and the second end connector 11 of different sizes can be replaced.

[0043] The inner and outer pressure rings of the present invention are connected by a threaded structure, which can achieve two-way locking and is easy to operate; the present invention replaces the welding pipe nozzle and omits the cutting process of the welding pipe nozzle, thereby improving production efficiency; the present invention does not require a cutting process, thus avoiding the influence of the excess materials generated during the cutting process on the airtight test piece, that is, the state of the airtight test piece is not changed before and after the test, thereby ensuring the quality of the airtight test piece; the airtight tooling of the present invention is reusable, thereby reducing production costs. In summary, the present tooling replaces the welding and cutting processes, greatly shortens the test cycle, and avoids the risk of excess materials generated during the cutting process; it can avoid the risk of product scrapping due to dimensional deviations when cutting the pipe nozzle; it can be reused, reducing the consumption of the pipe nozzle, reducing the testing cost, and realizing the ability to reduce costs and increase efficiency during the production process.

[0044] The present invention further provides an airtightness test system, which adopts the detachable split airtightness tooling, and also includes a gas distribution platform, wherein the first end connector 1 and the second end connector 11 are connected to the pipeline of the gas distribution platform.

[0045] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A detachable split airtight tooling, characterized in that: It comprises a first end connecting piece (1), a second end connecting piece (11), an inner pressure ring (2), an outer pressure ring (3) and a sealing piece (5); The outer pressure ring (3) is detachably mounted on the first end connection piece (1), and the inner pressure ring (2) is detachably mounted on the second end connection piece (11), and the inner pressure ring (2) and the outer pressure ring (3) are detachably connected; the inner pressure ring (2) and the outer pressure ring (3) are enclosed together to form a receiving space, and the receiving space is used to receive the piece to be tested for airtightness; The two ends of the piece to be tested for airtightness extend into the first end connection piece (1) and the second end connection piece (11) respectively, and a sealing piece (5) is installed between one end of the piece to be tested for airtightness and the first end connection piece (1), and between the other end of the piece to be tested for airtightness and the second end connection piece (11); The first end connecting piece (1) and the second end connecting piece (11) are used to connect the airtight tooling to an external pipeline; The inner pressure ring (2) and / or the outer pressure ring (3) are provided with a gas leakage detection hole, and the accommodating space is connected to the outside through the gas leakage detection hole.

2. The detachable split airtight tooling according to claim 1 is characterized in that: The first end connecting piece (1) and the second end connecting piece (11) are respectively a left end connecting piece and a right end connecting piece.

3. The detachable split airtight tooling according to claim 1 is characterized in that: The first end connecting piece (1) and the second end connecting piece (11) are both threaded joints.

4. The detachable split airtight tooling according to claim 1, characterized in that: The inner pressure ring (2) and the outer pressure ring (3) are detachably connected via a threaded structure.

5. The detachable split airtight tooling according to claim 1, characterized in that: The sealing element (5) is an O-ring.

6. The detachable split airtight tooling according to claim 5, characterized in that: The number of the O-rings is 4, two of which are sleeved on one side of the piece to be tested for airtightness, and the other two O-rings are sleeved on the other side of the piece to be tested for airtightness.

7. The detachable split airtight tooling according to claim 5, characterized in that: The O-ring is made of soft polyvinyl chloride material.

8. The detachable split airtight tooling according to claim 1, characterized in that: The first end connecting piece (1) and the second end connecting piece (11) have the same structure, and both comprise a connecting portion (12) and a limiting portion (13); The connecting portion (12) is a hollow structure, the end of the piece to be tested for airtightness passes through the limiting portion (13) and extends to the connecting portion (12), and the limiting portion (13) is a step structure; The limiting portion (13) in the first end connecting piece (1) and the limiting portion (13) in the second end connecting piece (11) are used to limit the outer pressure ring (3) and the inner pressure ring (2), respectively.

9. The detachable split airtight tooling according to claim 1, characterized in that: It also includes a guide rod (6); the guide rod (6) is detachably connected to both ends of the airtight test piece; the guide rod (6) includes a front portion (61), a middle portion (62), a rear portion (63) and an end portion (64); The diameter of the front part (61) is smaller than that of the rear part; the middle part (62) is an intermediate transition arc; the diameter of the rear part (63) matches the outer diameters of the two ends of the airtight test piece; the diameter of the rear part (63) matches the inner diameters of the two ends of the airtight test piece; the diameter of the end (64) is smaller than the inner diameters of the first end connector (1) and the second end connector (11); O-ring grooves are provided inside the first end connecting piece (1) and the second end connecting piece (11).

10. An airtightness testing system, characterized in that: The detachable split airtight tooling according to any one of claims 1 to 9 further comprises a gas distribution platform, wherein the first end connector (1) and the second end connector (11) are connected to a pipeline of the gas distribution platform.

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