Low-temperature vacuum-pumping test device for sealed combined product and use method of low-temperature vacuum-pumping test device

Abstract

The invention discloses a low-temperature vacuumizing test device for a sealed combined product and a use method thereof, and belongs to the technical field of sealing test devices. The opening end of the shell is connected with the upper cover, the air inlet end of the air exhaust adapter nozzle is fixedly communicated with the upper cover, and the air outlet end is communicated with the air exhaust pipe. An air one-way valve is arranged on the exhaust pipe. One end of the verification adapter nozzle is fixedly communicated with the shell, and the other end of the verification adapter nozzle is fixedly communicated with one end of the connecting gas pipe; according to the invention, the precise positioning of the sealing combination product is realized, and the accuracy and reliability of the test are ensured; through the ingenious design, the risk of frostbite to an operator in the low-temperature test process is effectively avoided, and the test safety is improved; meanwhile, the low-temperature test and the vacuumizing test can be completed at the same time by replacing part of the structure, the universality and flexibility of the device are improved, and the manufacturing cost and resources are saved.

Description

Technical Field

[0001] The invention relates to a low-temperature vacuum test device for a sealed combination product and a use method thereof, belonging to the technical field of sealed test devices. Background Art

[0002] During the manufacturing and testing process of sealing combination products, it is crucial to ensure their performance stability under extreme temperature conditions. In particular, in certain application fields, such as aerospace, cryogenic storage technology, and specific industrial environments, some sealing combination products need to maintain their sealing performance at extremely low temperatures. Specifically, such products need to be vacuum tested in an extremely low temperature environment below minus 56 degrees Celsius to verify the sealing performance without any gas leakage between the two contact surfaces.

[0003] However, there is currently no low-temperature vacuum testing equipment that can meet the requirements of this type of sealing combination, which not only limits the performance verification of sealing combination products under extreme conditions, but also hinders the advancement of related technologies and the expansion of their applications. Summary of the invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a low-temperature vacuum testing device for a sealed combination product and a method for using the same.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-temperature vacuum testing device for a sealed combination product, comprising an upper cover, a shell, a negative pressure gauge, an exhaust mechanism and a verification mechanism; the opening end of the shell is detachably fixedly connected to the upper cover, the upper cover is connected with a negative pressure gauge and an exhaust mechanism, and the shell is connected with a verification mechanism.

[0006] The air extraction mechanism comprises an air extraction pipe and an air extraction adapter nozzle; the air inlet end of the air extraction adapter nozzle is fixedly connected to the upper cover, and the air outlet end of the air extraction adapter nozzle is fixedly connected to the air inlet end of the air extraction pipe.

[0007] An air one-way valve is arranged on the air extraction pipe.

[0008] The verification mechanism includes a gas mass flow meter, a connecting air pipe and a verification adapter nozzle; one end of the verification adapter nozzle is fixedly connected to the shell, the other end of the verification adapter nozzle is fixedly connected to one end of the connecting air pipe, and the other end of the connecting air pipe is fixedly connected to the gas mass flow meter.

[0009] A method for using a low-temperature vacuum test device for a sealed assembly product of the present invention comprises the following steps:

[0010] S1: Place the gasket into the groove in the middle of the high-precision surface of the shell;

[0011] S2: Place the right end of the sealing assembly product into the groove in the middle of the high-precision surface of the shell, and then the outer wall of the sealing assembly product fits with the inner wall of the groove of the shell;

[0012] S3: Put the cushion block on the outer side of the convex shaft in the middle of the high-precision surface of the upper cover;

[0013] S4: Insert the convex shaft of the upper cover into the left end of the sealing assembly product to complete the vacuum test installation of the sealing assembly product;

[0014] S5: Install the air extraction adapter nozzle and the verification adapter nozzle, and also install an air extraction adapter nozzle in the mounting hole of the negative pressure gauge;

[0015] S6: The outer ports of the verification adapter nozzle and the two air extraction adapter nozzles described in S5 are sealed with rubber plugs, and then finger sleeves are fitted on the outer sides of the verification adapter nozzle and the two air extraction adapter nozzles;

[0016] S7: placing the product obtained in S6 in a low temperature environment for at least 2 hours;

[0017] S8: Take out what is obtained in S7, remove all rubber plugs and finger sleeves, and install the negative pressure gauge, the air extraction mechanism and the verification mechanism in sequence;

[0018] S9: The exhaust pipe is connected to the exhaust device, and the exhaust device extracts the gas in the cavity formed by the upper cover and the shell;

[0019] S10: Negative pressure gauge monitors whether the gas volume in the cavity is vacuum;

[0020] S11: The gas mass flow meter of the verification agency monitors whether there is gas inflow and completes the low-temperature vacuum test of the sealed combination product.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention realizes precise positioning of the sealing combination product, ensuring the accuracy and reliability of the test; and through ingenious design, effectively avoids the risk of frostbite to the operator during the low-temperature test, thereby improving the safety of the test; at the same time, the present invention can simultaneously complete the low-temperature test and the vacuum test by replacing part of the structure, thereby improving the versatility and flexibility of the equipment and saving manufacturing costs and resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure obtained by S6. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] A low-temperature vacuum test device for a sealed assembly product, comprising an upper cover 6, a shell 9, a negative pressure gauge 14, an air extraction mechanism and a verification mechanism; the open end of the shell 9 is detachably fixedly connected to the upper cover 6 by means of screws 7 and a guide shaft diameter clearance, and a rubber ring 8 is placed in the groove formed after the upper cover 6 and the shell 9 are installed to form a radial seal. The upper cover 6 is connected to a negative pressure gauge 14 and an air extraction mechanism, and the shell 9 is connected to a verification mechanism.

[0027] The exhaust mechanism includes an exhaust pipe 1 and an exhaust adapter nozzle 4; the air inlet end of the exhaust adapter nozzle 4 is fixedly connected to the upper cover 6 by threaded engagement, and the air outlet end of the exhaust adapter nozzle 4 is fixedly connected to the air inlet end of the exhaust pipe 1 through a corresponding stainless steel throat clamp 3.

[0028] The air extraction pipe 1 is provided with an air one-way valve 16 , and the air one-way valve 16 is connected to the air extraction device and the air extraction pipe 1 through corresponding connectors.

[0029] The verification mechanism includes a gas mass flowmeter 11, a connecting air pipe 15 and a verification adapter nozzle 17; one end of the verification adapter nozzle 17 is screwed and fixedly connected to the shell 9, and the other end of the verification adapter nozzle 17 is fixedly connected to one end of the connecting air pipe 15 through a corresponding stainless steel throat clamp 3, and the other end of the connecting air pipe 15 is fixedly connected to the gas mass flowmeter 11 through a corresponding joint.

[0030] A method for using a low-temperature vacuum test device for a sealed assembly product of the present invention comprises the following steps:

[0031] S1: Place the gasket 10 into the groove in the middle of the high-precision surface of the housing 9;

[0032] S2: Place the right end of the sealing assembly product into the groove in the middle of the high-precision surface of the shell 9 to position and center the right part of the sealing assembly product. At this time, the outer wall of the sealing assembly product fits with the inner wall of the groove of the shell 9, and the right part of the sealing assembly product is sealed by the gasket 10;

[0033] S3: Put the cushion block 13 on the outer side of the convex shaft in the middle of the high-precision surface of the upper cover 6;

[0034] S4: insert the convex shaft of the upper cover 6 into the left end of the sealing assembly product, position and center the left part structure of the sealing assembly product, at this time, the rubber ring 12 at the left end of the sealing assembly product is in contact with the outer side of the convex shaft, the gasket 13 and the rubber ring 12 seal the left part structure of the sealing assembly product, and complete the vacuum test installation of the sealing assembly product;

[0035] S5: Install the air extraction adapter nozzle 4 and the verification adapter nozzle 17, and also install an air extraction adapter nozzle 4 in the installation hole of the negative pressure gauge 14;

[0036] S6: The outer ports of the verification adapter nozzle 17 and the two air extraction adapter nozzles 4 described in S5 are sealed with rubber plugs 2, and then finger sleeves 18 are fitted on the outer sides of the verification adapter nozzle 17 and the two air extraction adapter nozzles 4 through interference fit;

[0037] S7: placing the product obtained in S6 in a low temperature environment for at least 2 hours;

[0038] S8: Take out what is obtained in S7, remove all the rubber plugs 2 and the finger sleeves 18, and install the negative pressure gauge 14, the air extraction mechanism and the verification mechanism in sequence; gaskets 5 are provided between the negative pressure gauge 14 and the upper cover 6, between the air extraction adapter nozzle 4 and the upper cover 6, and between the air outlet adapter nozzle 17 and the housing 9 to prevent air leakage;

[0039] S9: the exhaust pipe 1 is connected to the exhaust device, and the exhaust device extracts the gas in the cavity formed by the upper cover 6 and the shell 9;

[0040] S10: The negative pressure gauge 14 monitors whether the gas volume in the cavity is vacuum;

[0041] S11: The gas mass flow meter 11 of the verification agency monitors whether there is gas inflow, and completes the low-temperature vacuum test of the sealed combination product.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A low temperature vacuum test device for sealing combination products, characterized in that: It comprises an upper cover (6), a shell (9), a negative pressure gauge (14), an air extraction mechanism and a verification mechanism; the open end of the shell (9) is detachably fixedly connected to the upper cover (6), the upper cover (6) is connected to the negative pressure gauge (14) and the air extraction mechanism, and the shell (9) is connected to the verification mechanism.

2. A low temperature vacuum test device for sealing combination products according to claim 1, characterized in that: The air extraction mechanism comprises an air extraction pipe (1) and an air extraction adapter nozzle (4); the air inlet end of the air extraction adapter nozzle (4) is fixedly connected to the upper cover (6), and the air outlet end of the air extraction adapter nozzle (4) is fixedly connected to the air inlet end of the air extraction pipe (1).

3. A low temperature vacuum test device for sealing combination products according to claim 2, characterized in that: The air extraction pipe (1) is provided with an air one-way valve (16).

4. A low temperature vacuum test device for sealing assembly products according to claim 2, characterized in that: The verification mechanism comprises a gas mass flow meter (11), a connecting air pipe (15) and a verification adapter nozzle (17); one end of the verification adapter nozzle (17) is fixedly connected to the housing (9), the other end of the verification adapter nozzle (17) is fixedly connected to one end of the connecting air pipe (15), and the other end of the connecting air pipe (15) is fixedly connected to the gas mass flow meter (11).

5. A method for using the low temperature vacuum test device for sealed combination products according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1: Place the gasket (10) into the groove in the middle of the high-precision surface of the housing (9); S2: placing the right end of the sealing assembly product into the groove in the middle of the high-precision surface of the housing (9), so that the outer wall of the sealing assembly product fits into the inner wall of the groove of the housing (9); S3: Put the cushion block (13) on the outer side of the convex shaft in the middle of the high-precision surface of the upper cover (6); S4: inserting the convex shaft of the upper cover (6) into the left end of the sealing assembly product to complete the vacuum test installation of the sealing assembly product; S5: Install the air extraction adapter nozzle (4) and the verification adapter nozzle (17), and also install an air extraction adapter nozzle (4) in the installation hole of the negative pressure gauge (14); S6: The outer ports of the verification adapter nozzle (17) and the two air extraction adapter nozzles (4) described in S5 are sealed with rubber plugs (2), and then finger sleeves (18) are interference fit on the outer sides of the verification adapter nozzle (17) and the two air extraction adapter nozzles (4); S7: placing the product obtained in S6 in a low temperature environment for at least 2 hours; S8: Take out what is obtained in S7, remove all rubber plugs (2) and finger sleeves (18), and install the negative pressure gauge (14), the air extraction mechanism, and the verification mechanism in sequence; S9: the exhaust pipe (1) is connected to the exhaust device, and the exhaust device extracts the gas in the cavity formed by the upper cover (6) and the shell (9); S10: A negative pressure gauge (14) monitors whether the gas volume in the cavity is a vacuum; S11: The gas mass flow meter (11) of the verification agency monitors whether there is gas inflow, and completes the low-temperature vacuum test of the sealed assembly product.

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