Sealing workpiece

Abstract

The utility model relates to a sealing workpiece which is applied to vacuum test equipment, the sealing workpiece comprises a first cover body and a second cover body, the first cover body comprises a mounting part and a joint part integrally formed with the mounting part, the mounting part is mounted on the vacuum test equipment, and the first cover body is connected with the second cover body in a joint mode through the joint part; the mounting part is provided with a first opening, the first opening is close to the vacuum test equipment and is communicated with an external connecting hole of the vacuum test equipment, the joint part is provided with a second opening communicated with the first opening, and the second opening is far away from the vacuum test equipment; when the first cover body and the second cover body are connected in a joint mode, the first cover body and the second cover body are matched to form a third opening communicated with the first opening, the third opening is far away from the vacuum testing equipment, and the diameter of the third opening is smaller than that of the first opening. The application can reduce the clay usage amount when the vacuum test equipment is connected with the peripheral equipment and the problem of vacuum leakage possibly caused when the clay is used, and improves the test efficiency of the vacuum test equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test equipment, in particular to a sealing workpiece. BACKGROUND

[0002] In reliability testing, high-altitude and vacuum testing are common test items, and both high-altitude and vacuum testing can be performed in a vacuum test device. In some test processes, the article to be tested needs to be tested under the condition of starting up, at which time the article to be tested in the vacuum test device often needs to be connected with peripheral equipment outside the vacuum test device to obtain various test parameters of the article to be tested through the peripheral equipment. The vacuum test device is usually provided with an external connection hole, and a wire can be connected with the peripheral equipment outside the vacuum test device through the external connection hole.

[0003] In order to improve the test accuracy, after the article to be tested is connected with the peripheral equipment, the external connection hole needs to be sealed. The commonly used method in the related art is to seal the external connection hole with a sealing rubber strip, and then use specially made clay to fill and seal the wire located at the external connection hole. However, in this method, the clay cannot be filled or removed at one time, which is time-consuming and labor-consuming. In addition, in some more severe test environments, the strength of the clay is not enough to support the vacuum pressure, which often causes the clay to collapse and be sucked into the vacuum test device, resulting in vacuum leakage problem, and thus affecting the test efficiency of the article to be tested. UTILITY MODEL CONTENT

[0004] In view of the above, it is necessary to provide a sealing workpiece, which can reduce the use amount of clay when the vacuum test device is connected with the peripheral equipment and the vacuum leakage problem caused by the use of clay, and improve the test efficiency of the vacuum test device.

[0005] The present application provides a sealing workpiece applied in a vacuum test device, which comprises a first cover body and a second cover body. The first cover body comprises a mounting portion and an engaging portion integrally formed with the mounting portion. The mounting portion is mounted to the vacuum test device, and the first cover body is connected with the second cover body through the engaging portion. The mounting portion has a first opening close to the vacuum test device, and the first opening is in communication with an external connection hole of the vacuum test device. The engaging portion has a second opening in communication with the first opening, and the second opening is away from the vacuum test device. When the first cover body is connected with the second cover body, the first cover body and the second cover body cooperate to form a third opening in communication with the first opening, the third opening is away from the vacuum test device, and the diameter of the third opening is smaller than that of the first opening.

[0006] In the present application, the first cover body can be mounted on the vacuum testing device through the mounting portion. When the wire of the peripheral device is connected to the article to be tested in the vacuum testing device, the wire can pass through the second opening of the joint portion and the first opening of the mounting portion, and then pass through the outer connecting hole of the vacuum testing device into the vacuum testing device. After that, the second cover body is connected and formed by the joint portion of the first cover body, and a direct third opening with a diameter smaller than the first opening is formed. The wire then passes through the third opening to connect to the peripheral device. At this time, a small amount of clay is used to fill the third opening, which can achieve the sealing effect. Therefore, the first cover body and the second cover body can form a sealing workpiece to replace most of the clay, which can reduce the amount of clay used, reduce the operation time of the clay sealing method, improve the testing efficiency, and reduce the problem of clay collapse and vacuum leakage caused by insufficient strength of the clay.

[0007] In some embodiments, the joint portion has a joint protrusion, the second cover body has a joint groove matched with the joint protrusion, and the joint protrusion is embedded in the joint groove when the first cover body and the second cover body are connected.

[0008] In some embodiments, the joint portion has a joint groove, the second cover body has a joint protrusion matched with the joint groove, and the joint protrusion is embedded in the joint groove when the first cover body and the second cover body are connected.

[0009] In some embodiments, the joint portion is formed with a first fixing portion, the second cover body is formed with a second fixing portion, and the first fixing portion cooperates with the second fixing portion to stabilize the first cover body and the second cover body when the first cover body and the second cover body are connected.

[0010] In some embodiments, the mounting portion is formed with a flange on the side close to the vacuum testing device, and the diameter of the flange is equal to the diameter of the outer connecting hole.

[0011] In some embodiments, the joint portion is formed with an inclined first slope portion on the end away from the vacuum testing device, the second cover body is formed with an inclined second slope portion on the end away from the vacuum testing device, and the first slope portion cooperates with the second slope portion to form a third opening when the first cover body and the second cover body are connected.

[0012] In some embodiments, the second cover body is formed with an eave portion embedding at least part of the joint portion on the side close to the vacuum testing device.

[0013] In some embodiments, the mounting portion has a plurality of mounting screw holes arranged towards the vacuum testing device, and the mounting portion is mounted on the vacuum testing device through the mounting screw holes.

[0014] In some embodiments, the material of the sealing workpiece is carbon steel with a carbon content of 0.25% to 0.60%.

[0015] In some embodiments, the material of the sealed workpiece is carbon steel with a carbon content of 0.4% to 0.60%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of an application scenario of a sealed workpiece of an embodiment of the present application.

[0017] Figure 2 is a structural schematic diagram of a sealed workpiece of an embodiment of the present application.

[0018] Figure 3 is an exploded structural schematic diagram of a sealed workpiece of an embodiment of the present application.

[0019] Figure 4 is a first perspective structural schematic diagram of a first cover of an embodiment of the present application.

[0020] Figure 5 is a second perspective structural schematic diagram of a first cover of an embodiment of the present application.

[0021] Figure 6 is a first perspective structural schematic diagram of a second cover of an embodiment of the present application.

[0022] Figure 7 is a second perspective structural schematic diagram of a second cover of an embodiment of the present application.

[0023] MAIN ELEMENT SYMBOL EXPLANATION

[0024] 1, sealed workpiece; 2, vacuum test equipment; 11, first cover; 12, second cover; 13, fastener; 111, mounting portion; 112, engaging portion; 1110, first opening; 1111, mounting screw hole; 1112, flange; 1120, second opening; 1121, engaging protrusion; 1122, first fixing portion; 1123, first slope portion; 121, engaging groove; 122, second fixing portion; 123, eave portion; 124, second slope portion; 100, third opening.

[0025] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] In the description of the embodiments of the present application, the words "exemplary", "or", "for example" and the like are used to mean serving as an example, instance or illustration. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of "exemplary", "or", "for example" and the like is intended to present the relevant concept in a specific manner.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. It should be understood that, unless otherwise stated, " / " in this application means "or". For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. "At least one" refers to one or more. "More than one" refers to two or more. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, and a, b, and c (seven cases).

[0028] It should also be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0029] In reliability testing, high-altitude and vacuum testing are common tests. High-altitude testing simulates the performance parameters of the test item after a drop from the air, while vacuum testing simulates the performance parameters of the test item in a vacuum or low-pressure environment. Sometimes, both high-altitude and vacuum tests can be performed simultaneously in vacuum testing equipment. Vacuum testing equipment is mainly used to provide a vacuum or low-pressure environment.

[0030] In some testing processes, the item under test needs to undergo high-altitude or vacuum testing while the device is powered on. In such cases, it is often necessary to connect the item under test inside the vacuum testing equipment to peripheral devices outside the equipment to obtain various test parameters. For example, peripheral devices such as electrical parameter monitoring devices, pressure monitoring devices, and temperature monitoring devices can be used to obtain the electrical parameters, withstand voltage values, and temperature values ​​of the item under test in a vacuum or low-pressure environment. Vacuum testing equipment typically has external connection ports, through which cables can be used to connect the item under test inside the vacuum testing equipment to peripheral devices outside the equipment.

[0031] In order to improve the test accuracy, after the to-be-tested article is connected with the peripheral equipment, the outer connection hole needs to be sealed to ensure that the vacuum test equipment can provide the required vacuum or low pressure environment. The commonly used way in the related art is to use a sealing rubber strip (such as a rubber strip) to seal the outer connection hole, and then use specially made clay to fill and seal the wires located at the outer connection hole, thereby completing the sealing of the outer connection hole. However, in this way, since there may be a large number of wires, the process of filling the clay or removing the clay cannot be completed at one time, resulting in time and labor consumption of the entire test process. In addition, in some more severe test environments, since the clay itself is relatively soft, in the case of a relatively large pore, the material strength of the clay is not enough to support the vacuum pressure, which often causes the clay to collapse and be sucked into the vacuum test equipment, resulting in a vacuum leakage problem, thereby affecting the test efficiency of the to-be-tested article.

[0032] Therefore, the embodiments of the present application provide a sealing workpiece, which can reduce the use amount of clay when the vacuum test equipment is connected with the peripheral equipment and the vacuum leakage problem caused by the use of clay, and improve the test efficiency of the vacuum test equipment. Some embodiments will be described below with reference to the accompanying drawings. In the case of no conflict, the embodiments described below and the features in the embodiments can be combined with each other.

[0033] Figure 1 is a schematic diagram of an application scenario of the sealing workpiece 1 of the embodiments of the present application. Figure 2 is a schematic diagram of the structure of the sealing workpiece 1 of the embodiments of the present application. Figure 3 is an exploded schematic diagram of the structure of the sealing workpiece 1 of the embodiments of the present application.

[0034] As shown in Figure 1 , the embodiments of the present application provide a sealing workpiece 1 applied in a vacuum test equipment 2, and the vacuum test equipment 2 is used to provide a vacuum or low pressure environment. A to-be-tested article can be subjected to a high-altitude drop or pressure test in the vacuum test equipment 2. The vacuum test equipment 2 can be provided with an outer connection hole, and wires of a peripheral equipment (such as an electrical parameter monitoring device) can be connected to the to-be-tested article in the vacuum test equipment 2 through the outer connection hole, so that the to-be-tested article can be subjected to a high-altitude drop or pressure test in a state of starting up. The sealing workpiece 1 of the embodiments of the present application can be installed at the outer connection hole of the vacuum test equipment 2 to seal the outer connection hole.

[0035] As shown in Figure 2 or Figure 3As shown, the sealed workpiece 1 can include a first cover 11 and a second cover 12. In some embodiments, the material of the sealed workpiece 1 can be carbon steel with a carbon content of 0.25% to 0.60% (i.e., medium carbon steel), i.e., the material of the first cover 11 and the second cover 12 can be carbon steel with a carbon content of 0.25% to 0.60%. In other embodiments, the material of the sealed workpiece 1 can also be carbon steel with a carbon content of 0.4% to 0.60% (i.e., S45C medium carbon steel), i.e., the material of the first cover 11 and the second cover 12 can also be carbon steel with a carbon content of 0.4% to 0.60%. In other embodiments, the sealed workpiece 1 can also be made of other metal or alloy materials with certain hardness and ductility. In this case, the metal or alloy material with certain hardness can serve as support when applied to the vacuum testing device 2 to reduce the problem of vacuum leakage caused by clay collapse, and the metal or alloy material with certain ductility can serve as sealing when applied to the vacuum testing device 2 by virtue of the surface of the metal or alloy material automatically adhering to the negative pressure environment to reduce the problem of vacuum leakage.

[0036] As shown in Figure 3 , the first cover 11 can include a mounting portion 111 and an engaging portion 112, the mounting portion 111 can be mounted to the vacuum testing device 2, and the first cover 11 is connected to the second cover 12 through the engaging portion 112. The mounting portion 111 has a first opening 1110 (see Figure 4 , the first opening 1110 is close to the vacuum testing device 2, and the first opening 1110 is in communication with the outer connecting hole of the vacuum testing device 2. The engaging portion 112 has a second opening 1120 (see Figure 3 , the second opening 1120 is away from the vacuum testing device 2.

[0037] In some embodiments, the engaging portion 112 can be formed integrally with the mounting portion 111. In this case, the support function of the first cover 11 can be improved.

[0038] Figure 4 is a first perspective view of the first cover 11 of the embodiment of the present application. Figure 5 is a second perspective view of the first cover 11 of the embodiment of the present application.

[0039] In some embodiments, as shown in Figure 4 , the shape and size of the first opening 1110 can be substantially the same as the shape and size of the outer connecting hole of the vacuum testing device 2. As shown in Figure 3As shown, the second opening 1120 can be a large notch shape. In this case, after the first cover 11 is installed on the vacuum testing equipment 2, the wires of the peripheral equipment can be connected to the test item in the vacuum testing equipment 2 through the second opening 1120 of the first cover 11 and then through the first opening 1110 and the external connection hole of the vacuum testing equipment 2. This facilitates the connection of the peripheral equipment wires to the test item and reduces the inconvenience when using a large amount of clay.

[0040] like Figure 2 As shown, when the first cover 11 and the second cover 12 are joined together, they can cooperate to form a third opening 100 communicating with the first opening 1110. The third opening 100 is away from the vacuum testing equipment 2, and its diameter is smaller than that of the first opening 1110. In this case, after the wire is connected to the test item in the vacuum testing equipment 2, it is joined to the second cover 12 and the first cover 11 through the joint 112 to form a direct third opening 100 with a diameter smaller than that of the first opening 1110. The wire then passes through the third opening 100 to connect to the surrounding equipment. At this time, a sealing effect can be achieved by filling the third opening 100 with very little clay. Thus, the first cover 11 and the second cover 12 can form a sealing workpiece 1 that replaces most of the clay, which can reduce the amount of clay used, reduce the operation time of clay sealing, improve testing efficiency, and reduce the problems of clay collapse and vacuum leakage caused by insufficient clay strength.

[0041] It is understandable that after the first cover 11 and the second cover 12 are joined, they can automatically adhere to each other under negative pressure thanks to the surface of the metal or alloy material. At this time, by filling the third opening 100 with a very small amount of clay, the sealing workpiece 1 and the very small amount of clay can seal the external connection hole of the vacuum testing equipment 2. In addition, since the diameter of the third opening 100 is smaller than the diameter of the first opening 1110, after the wire passes through, the first opening 1110 and the external connection hole can be sealed by a sealing ring, such as a rubber strip. The gap in the third opening 100 is already small after the wire passes through. At this time, filling the third opening 100 with a very small amount of clay can achieve a seal.

[0042] In some embodiments, such as Figure 3 or Figure 4As shown, the mounting portion 111 has a plurality of mounting screw holes 1111 arranged towards the vacuum testing device 2, for example, the mounting screw holes 1111 can be 2, 3, 4 or more, and the plurality of mounting screw holes 1111 can be evenly distributed on the mounting portion 111. The mounting portion 111 is mounted on the vacuum testing device 2 through the mounting screw holes 1111. Specifically, when the mounting portion 111 needs to be mounted on the vacuum testing device 2, the mounting portion 111 is mounted on the vacuum testing device 2 through the screw holes and the screws matched with the screw holes. In this case, on the one hand, the mounting portion 111 can be stably mounted on the vacuum testing device 2, and on the other hand, the mounting portion 111 can be tightly attached to the vacuum testing device 2 through the fastening mode to reduce the problem of vacuum leakage.

[0043] In some embodiments, as shown in Figure 3 As shown, the joint portion 112 can have a joint protrusion 1121, which can be arranged along at least part of the surface of the joint portion 112 in contact with the second cover 12, and the joint protrusion 1121 can be a plurality, for example, two joint protrusions 1121 can be arranged along at least part of the surface of the joint portion 112 in contact with the second cover 12, respectively.

[0044] Correspondingly, the second cover 12 has a joint groove 121 matched with the joint protrusion 1121 (see Figure 6 As shown, the joint groove 121 can be arranged along at least part of the surface of the second cover 12 in contact with the joint portion 112, and the joint groove 121 can be a plurality, for example, two joint grooves 121 can be arranged along at least part of the surface of the second cover 12 in contact with the joint portion 112.

[0045] When the first cover 11 and the second cover 12 are jointed and connected, the joint protrusion 1121 is embedded in the joint groove 121. In this case, on the one hand, the joint protrusion 1121 embedded in the joint groove 121 can improve the joint degree and stability after joint of the first cover 11 and the second cover 12; on the other hand, it can improve the area of the contact surface after joint of the first cover 11 and the second cover 12, thereby improving the mutual close degree of the first cover 11 and the second cover 12 in the vacuum or low pressure environment, thereby improving the sealing performance.

[0046] In other embodiments, the joint portion 112 has a joint groove 121, the second cover 12 has a joint protrusion 1121 matched with the joint groove 121, and when the first cover 11 and the second cover 12 are jointed and connected, the joint protrusion 1121 is embedded in the joint groove 121. In other words, the joint protrusion 1121 can be arranged on the first cover 11 or the second cover 12, and correspondingly, the joint groove 121 can also be arranged on the first cover 11 or the second cover 12.

[0047] In some embodiments, as shown in Figure 3 or Figure 4 The joint 112 can be formed with a first fixing portion 1122. As shown in Figure 3 or Figure 6 The second cover 12 can be formed with a second fixing portion 122. When the first cover 11 and the second cover 12 are connected in a joint manner, the first fixing portion 1122 cooperates with the second fixing portion 122 to stabilize the first cover 11 and the second cover 12.

[0048] In some embodiments, the first fixing portion 1122 and the second fixing portion 122 can be fastened by a fastener 13 to stabilize the first cover 11 and the second cover 12. The fastener 13 can be a clamping mechanism or a screw.

[0049] In some embodiments, the first fixing portion 1122 can have a screw hole, and the second fixing portion 122 can also have a screw hole. The first fixing portion 1122 and the second fixing portion 122 can be fastened by a screw to stabilize the first cover 11 and the second cover 12.

[0050] In some embodiments, as shown in Figure 4 or Figure 5 The side of the mounting portion 111 close to the vacuum testing device 2 can be formed with a flange 1112, and the diameter of the flange 1112 is equal to the diameter of the outer connecting hole. In this case, when the mounting portion 111 is mounted on the vacuum testing device 2, the flange 1112 can be fitted with the outer connecting hole of the vacuum testing device 2, forming another barrier to prevent vacuum leakage, reducing the problem of vacuum leakage from the joint between the mounting portion 111 and the outer connecting hole when the mounting portion 111 is mounted on the vacuum testing device 2.

[0051] It can be understood that the diameter of the flange 1112 is equal to the diameter of the outer connecting hole, which means that, in an ideal case, the flange 1112 is cylindrical and its diameter is exactly equal to the diameter of the outer connecting hole, thereby fitting to reduce leakage. In actual cases, the diameter of the flange 1112 can be slightly smaller than the diameter of the outer connecting hole. At this time, under the action of vacuum pressure, the surface of the flange 1112 contacts the outer connecting hole and can also form a sealed contact due to the ductility of the flange 1112 itself.

[0052] In other embodiments, the flange 1112 can also be in the shape of a truncated cone, and the smaller-diameter end of the flange 1112 is close to the outer connecting hole, and the larger-diameter end of the flange 1112 is formed in the mounting portion 111. The minimum diameter of the flange 1112 in the shape of a truncated cone can be less than or equal to the diameter of the outer connecting hole, and the maximum diameter can be greater than the diameter of the outer connecting hole. In this case, the flange 1112 can be directly guided into the outer connecting hole by the inclined side surface of the flange 1112, and can be directly in close contact with the outer connecting hole by the inclined side surface, thereby also playing a sealing role.

[0053] In some embodiments, as shown in Figure 5 , the joint portion 112 is formed with an inclined first slope portion 1123 away from one end of the vacuum test device 2. As shown in Figure 7 , the second cover 12 is formed with an inclined second slope portion 124 away from one end of the vacuum test device 2. When the first cover 11 is connected to the second cover 12 in a joint manner, the first slope portion 1123 cooperates with the second slope portion 124 to form a third opening 100 (i.e. Figure 2 , in this case, the third opening 100 formed by the cooperation of the first slope portion 1123 and the second slope portion 124 can make the diameter of the third opening 100 smaller than the diameter of the first opening 1110, and the third opening 100 is suitable for the wire to pass through, thereby reducing the gap, and when the gap is small, the third opening 100 can be sealed by using a small amount of clay.

[0054] Figure 6 FIG. 1 is a first perspective view of a sealing workpiece 1 according to an embodiment of the present application. Figure 7 FIG. 2 is a second perspective view of the sealing workpiece 1 according to the embodiment of the present application.

[0055] In some embodiments, as shown in Figure 6 or Figure 7 , the second cover 12 is formed with an eave portion 123 close to one end of the vacuum test device 2, which covers at least part of the joint portion 112. In this case, on the one hand, the eave portion 123 can facilitate the assembly of the second cover 12 to the joint portion 112, and on the other hand, the eave portion 123 can also increase the contact surface between the second cover 12 and the joint portion 112 to improve the sealing effect.

[0056] In some embodiments, the edges of the sealing workpiece 1 can all be inclined. In this case, the comfort of the sealing workpiece 1 in the hands of the operating workers can be improved, so as to facilitate the operating workers to more quickly install or remove the sealing workpiece 1 from the vacuum test device 2.

[0057] In summary, in the sealing workpiece 1 of the embodiment of the present application, the first cover 11 can be installed on the vacuum testing device 2 through the mounting portion 111. When the wire of the peripheral equipment is connected to the object to be tested in the vacuum testing device 2, the wire can pass through the second opening 1120 of the joint portion 112 and the first opening 1110 of the mounting portion 111 and then pass through the outer connecting hole of the vacuum testing device 2 into the vacuum testing device 2. After that, the wire is connected to the peripheral equipment through the third opening 100 formed by the jointing and connecting of the second cover 12 and the joint portion 112 of the first cover 11, which is directly connected and has a smaller diameter than the first opening 1110. At this time, a small amount of clay is used to fill the third opening 100, which can achieve the sealing effect. Therefore, the first cover 11 and the second cover 12 can form the sealing workpiece 1 for replacing most of the clay, which can reduce the amount of clay used, reduce the operation time of the clay sealing method, improve the testing efficiency, and reduce the problems of clay collapse and vacuum leakage caused by insufficient strength of the clay. In other words, the first cover 11 and the second cover 12 can be separated (or "detachable") to facilitate the assembly of the wire, and the jointing of the first cover 11 and the second cover 12 can play a supporting and sealing role, which can reduce the use of clay and reduce the problem of vacuum leakage.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A seal for a workpiece for use in a vacuum testing apparatus, comprising: The sealing workpiece comprises a first cover and a second cover, the first cover comprises a mounting portion and an engaging portion integrally formed with the mounting portion, the mounting portion is mounted on the vacuum testing device, and the first cover is connected with the second cover through the engaging portion; The mounting portion has a first opening close to the vacuum testing device, the first opening is communicated with an outer connecting hole of the vacuum testing device, the engaging portion has a second opening communicated with the first opening, and the second opening is away from the vacuum testing device; When the first cover is connected with the second cover, the first cover and the second cover cooperatively form a third opening communicated with the first opening, the third opening is away from the vacuum testing device, and the diameter of the third opening is smaller than that of the first opening.

2. The sealed workpiece of claim 1, wherein, The engaging portion has an engaging protrusion, the second cover has an engaging groove matched with the engaging protrusion, and the engaging protrusion is embedded in the engaging groove when the first cover is connected with the second cover.

3. The sealed workpiece of claim 1, wherein, The engaging portion has an engaging groove, the second cover has an engaging protrusion matched with the engaging groove, and the engaging protrusion is located in the engaging groove when the first cover is connected with the second cover.

4. The sealed workpiece of claim 1, wherein, The engaging portion is provided with a first fixing portion, the second cover is provided with a second fixing portion, and the first fixing portion cooperates with the second fixing portion to stabilize the first cover and the second cover when the first cover is connected with the second cover.

5. The sealed workpiece of claim 1, wherein, One side of the mounting portion close to the vacuum testing device is provided with a flange, and the diameter of the flange is equal to that of the outer connecting hole.

6. The sealed workpiece of claim 1, wherein, An inclined first slope portion is formed at one end of the engaging portion away from the vacuum testing device, an inclined second slope portion is formed at one end of the second cover away from the vacuum testing device, and the first slope portion cooperates with the second slope portion to form the third opening when the first cover is connected with the second cover.

7. The sealed workpiece of claim 1, wherein, One end of the second cover close to the vacuum testing device is provided with a eave portion embedded with at least part of the engaging portion.

8. The sealed workpiece of claim 1, wherein, The mounting portion has a plurality of mounting screw holes arranged towards the vacuum testing device, and the mounting portion is mounted on the vacuum testing device through the mounting screw holes.

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