A sealed connection structure

Abstract

The application provides a sealed connection structure, relates to the technical field of dustproof grade test of electrical equipment shell, and comprises a locking nut, a first sealing ring, a second sealing ring, a diameter expansion column and a joint. The joint comprises a threaded end, an intermediate section and a connecting end which are connected in sequence. A test interface on the shell under test is located between the locking nut and the first sealing ring. The intermediate section is provided with a first protruding part. The second sealing ring is sleeved on the intermediate section, and the outer side of the second sealing ring can abut against the inner side of the test interface on the shell under test. The diameter expansion column is sleeved on the intermediate section, the first end of the diameter expansion column is in contact with the locking nut, the second end of the diameter expansion column can be inserted into the first end of the second sealing ring and expand the inner diameter of the first end of the second sealing ring. The first end of the diameter expansion column is provided with a third protruding part, and the third protruding part is provided with a third sealing ring between the shell under test. The first sealing ring, the second sealing ring and the third sealing ring are used in cooperation, so that the sealing is not necessary to be achieved by smearing silica gel, and the test efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of dustproof rating testing technology for electrical equipment enclosures, and in particular to a sealed connection structure. Background Technology

[0002] The dust and sand test chamber is suitable for testing the sealing performance of electrical equipment enclosures. It is mainly used for dustproof tests of the IP5X and IP6X levels specified in the enclosure protection rating standards. The enclosure under test is usually equipped with a test interface (hole) specifically for dustproof testing. This test interface can be connected to the connector, air extraction pipe and vacuum pump inside the dust and sand test chamber in sequence. During the test, the vacuum pump of the dust and sand test chamber uses the pressure difference to draw air mixed with dust particles into the enclosure under test. The air extraction volume is 80 times the volume of the enclosure under test, the air extraction speed does not exceed 60 times the volume of the enclosure under test per hour, and the pressure difference must not exceed 2 kPa under any circumstances.

[0003] Because the dust particles inside the sand and dust test chamber are small, if the connection between the test interfaces is not properly sealed and dust enters the test shell, it will be impossible to determine whether the test shell meets the required enclosure protection level. Therefore, good sealing measures should be taken at the connection between the test interfaces and the joints to ensure the accuracy of the test results.

[0004] The patent document with application number CN201910254946.3 discloses a dustproof test chamber pressure test interface connector, which seals the test shell between a flat gasket and a sealing ring, uses a locking nut to provide sufficient pre-tightening force to achieve a tight seal, and then applies silicone to achieve a tight seal. After the silicone dries, the test can be carried out.

[0005] Although the test interface connector provided in the aforementioned patent document has the advantages of simple structure, strong versatility and good sealing, it still requires a long time to dry the silicone after applying it, and the test can only be carried out after the silicone is dry, which affects the test efficiency. Summary of the Invention

[0006] In view of the above situation, the present invention provides a sealed connection structure, which aims to solve the technical problem that after applying silicone to the existing test interface joint, it is necessary to wait for a long time for the silicone to dry before the test can be carried out, which affects the test efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a sealing connection structure, which mainly includes:

[0009] Lock the nut;

[0010] First sealing ring;

[0011] Second sealing ring;

[0012] Expanded diameter column; and

[0013] The connector includes a threaded end, an intermediate section, and a connecting end connected in sequence. The threaded end is used to connect a lock nut, the intermediate section is inserted into the test interface on the test shell, and the connecting end is used to connect a vacuum tube.

[0014] in:

[0015] The test interface on the test housing is located between the locking nut and the first sealing ring, and the middle section has a first protrusion. The first protrusion cooperates with the test housing to clamp the first sealing ring.

[0016] The second sealing ring is fitted in the middle section, and the outer side of the second sealing ring can abut against the inner side of the test interface on the test shell.

[0017] The expansion column is fitted into the middle section. The first end of the expansion column is in direct or intermittent contact with the locking nut, and the second end can be inserted into the first end of the second sealing ring and expand the inner diameter of the first end of the second sealing ring. The expansion column and the test interface work together to fix the second sealing ring.

[0018] The first end of the expanded diameter column has a third protrusion, and a third sealing ring is provided between the third protrusion and the test shell.

[0019] In some embodiments of the present invention, a gasket is provided between the first end of the expanded diameter post and the locking nut.

[0020] In some embodiments of the present invention, an annular notch is provided on the third protrusion.

[0021] In some embodiments of the present invention, the intermediate section has a second protrusion located between the first protrusion and the expansion post, and the second protrusion has a first shoulder on the side facing the expansion post.

[0022] The second end of the second sealing ring is fitted onto the first shoulder, and the expanded diameter column, the first shoulder, and the test interface work together to fix the second sealing ring.

[0023] In some embodiments of the present invention, a second shoulder is provided on the side of the second protrusion away from the expansion post, and the first protrusion, the second shoulder and the test shell cooperate together to clamp the first sealing ring.

[0024] In some embodiments of the present invention, the sealing connection structure further includes an elastic support mechanism located between the second end of the expanded diameter column and the second protrusion.

[0025] In some embodiments of the present invention, the elastic support mechanism includes:

[0026] First activity circle;

[0027] Second activity circle;

[0028] Fixed rod;

[0029] Movable lever; and

[0030] Compression spring;

[0031] in:

[0032] The first movable ring and the second movable ring are both fitted in the middle section. The first movable ring can abut against the second end of the expanded diameter column, and the second movable ring can abut against the second protrusion.

[0033] One end of the fixed rod is fixed to the second movable ring, one end of the movable rod is fixed to the first movable ring, and the other end is inserted into the fixed rod. The compression spring is located inside the movable rod, with one end connected to the fixed rod and the other end connected to the movable rod.

[0034] In some embodiments of the present invention, the first movable ring has a receiving groove, and the movable rod is fixed in the receiving groove by a connecting ring.

[0035] In some embodiments of the present invention, the elastic support mechanism further includes a third movable ring sleeved on the middle section, the third movable ring being located between the first movable ring and the second movable ring;

[0036] The third movable ring has a through hole, and a fixing ring is fixed on the inner wall of the through hole. The fixing ring is sleeved with the movable rod. A pushing block is fixed on the movable rod, and the pushing block is located between the fixing ring and the second movable ring.

[0037] In some embodiments of the present invention, there are two third movable rings, with the pushing block and the fixed ring corresponding one-to-one.

[0038] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0039] 1. Tighten the lock nut. The lock nut will push the expanding column to the right, so that the expanding column is inserted into the first end of the second sealing ring, thereby expanding the inner diameter of the first end of the second sealing ring. This will make the second sealing ring, the expanding column, and the test interface on the test shell fit together tightly, thereby improving the sealing effect of the second sealing ring.

[0040] 2. The use of the first sealing ring, the second sealing ring and the third sealing ring together ensures that the sealing connection structure has good sealing performance, eliminating the need to apply silicone for sealing and waiting for the silicone to dry before testing, which helps to improve testing efficiency.

[0041] 3. Tighten the lock nut. The lock nut provides preload, which enables the first and third sealing rings to be tightly connected to the test shell, and the second sealing ring to be tightly connected to the test interface on the test shell. Compared with the prior art, the lock nut only needs to provide a small preload to achieve a good sealing effect overall.

[0042] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a structural diagram of a sealed connection structure;

[0045] Figure 2 for Figure 1 A partial structural diagram;

[0046] Figure 3 for Figure 2 A schematic diagram of the elastic support mechanism in the diagram;

[0047] Figure 4 This is a schematic diagram of the structure when the first, third, and second movable rings are not in contact with each other.

[0048] icon:

[0049] 1- Lock nut, 11- Washer

[0050] 2-First sealing ring,

[0051] 3-Second sealing ring, 31-First end of the second sealing ring, 32-Second end of the second sealing ring.

[0052] 4-Expanding post, 41-Third protrusion, 411-Annular notch, 42-First end of expanding post, 43-Second end of expanding post

[0053] 5-Connector, 51-Threaded end, 52-Intermediate section, 521-First protrusion, 522-Second protrusion, 523-First shoulder, 524-Second shoulder, 53-Connecting end.

[0054] 6-Third sealing ring,

[0055] 7-Elastic support mechanism, 71-First movable ring, 711-Receiving groove, 712-Connecting ring, 72-Second movable ring, 73-Fixed rod, 74-Modible rod, 741-Push block, 75-Compression spring, 76-Third movable ring, 761-Through hole, 762-Fixed ring,

[0056] 8-Test shell, 81-Test interface. Detailed Implementation

[0057] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention.

[0058] In the description of the embodiments of the present invention, it should be understood that the terms "lateral", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0061] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0062] Example 1

[0063] Please refer to Figures 1-2 , Figure 1The direction indicated by the middle arrow is the airflow direction; this embodiment provides a sealing connection structure, which mainly includes: a locking nut 1, a first sealing ring 2, a second sealing ring 3, an expanded diameter column 4, and a connector 5. The connector 5 mainly includes a threaded end 51, an intermediate section 52, and a connecting end 53 connected in sequence. The threaded end 51 is used to connect the locking nut 1, the intermediate section 52 is inserted into the test interface 81 on the test shell 8, and the connecting end 53 is used to connect the compression fitting straight tube of the suction pipe.

[0064] The test interface 81 on the test housing 8 is located between the locking nut 1 and the first sealing ring 2. The middle section 52 has a first protrusion 521. When the locking nut 1 is tightened, the first protrusion 521 can cooperate with the test housing 8 to clamp the first sealing ring 2, thereby improving the sealing effect of the first sealing ring 2.

[0065] The second sealing ring 3 is fitted onto the middle section 52, and the outer side of the second sealing ring 3 can abut against the inner side of the test interface 81 on the test shell 8.

[0066] The expansion column 4 is fitted onto the intermediate section 52. The first end 42 of the expansion column is in direct or intermittent contact with the locking nut 1, and the second end can be inserted into the first end 31 of the second sealing ring and enlarge the inner diameter of the first end 31 of the second sealing ring. The expansion column 4 and the test interface 81 cooperate to fix the second sealing ring 3. By expanding the inner diameter of the first end 31 of the second sealing ring with the expansion column 4, the second sealing ring 3, the expansion column 4, and the test interface 81 on the test shell 8 can be tightly fitted together, thereby improving the sealing effect of the second sealing ring 3.

[0067] The first end 42 of the expanded diameter column has a third protrusion 41, and a third sealing ring 6 is provided between the third protrusion 41 and the test shell 8. The first sealing ring 2, the second sealing ring 3 and the third sealing ring 6 work together to make the sealing connection structure have good sealing performance, eliminating the need to apply silicone for sealing and eliminating the need to wait for the silicone to dry before testing, which helps to improve testing efficiency.

[0068] When connecting the connector 5 to the test interface 81 on the test housing 8, firstly, the first sealing ring 2, the second sealing ring 3, and the expansion pin 4 can be fitted onto the corresponding positions of the connector 5. Then, the threaded end 51 of the connector 5 is passed through the test interface 81 from right to left. Next, the connecting end 53 of the connector 5 is connected to the compression fitting of the suction pipe. Then, the locking nut 1 can be tightened to complete the installation of the connector 5. When disassembling the connector 5, first remove the locking nut 1, then move the expansion pin 4 to the left to separate the expansion pin 4 from the second sealing ring 3. After that, the connector 5 can be easily pulled off to the right.

[0069] The above text has described the main components and working principle of the sealing connection structure. The following text will elaborate on the sealing connection structure in more detail.

[0070] In this embodiment, preferably, the first end 42 of the expanded diameter post is in contact with the locking nut 1 at a distance. Specifically, a washer 11 is provided between the first end 42 of the expanded diameter post and the locking nut 1.

[0071] In this embodiment, preferably, the third protrusion 41 is provided with an annular notch 411 so that when disassembling the connector 5, the expansion column 4 can be moved to the left to separate the expansion column 4 from the second sealing ring 3.

[0072] In this embodiment, preferably, the intermediate section 52 has a second protrusion 522, which is located between the first protrusion 521 and the expanding post 4. The second protrusion 522 has a first shoulder 523 on the side facing the expanding post 4. The second end 32 of the second sealing ring is fitted onto the first shoulder 523. The expanding post 4, the first shoulder 523, and the test interface 81 cooperate to fix the second sealing ring 3. The first shoulder 523 facilitates the positioning and fixing of the second sealing ring 3.

[0073] In this embodiment, preferably, a second shoulder 524 is provided on the side of the second protrusion 522 away from the expanding post 4. The first protrusion 521, the second shoulder 524, and the test shell 8 cooperate to clamp the first sealing ring 2. The second shoulder 524 facilitates the positioning and fixation of the first sealing ring 2.

[0074] Example 2

[0075] This embodiment is a further improvement based on Embodiment 1.

[0076] Please refer to Figures 1-4 In this embodiment, the sealing connection structure may further include an elastic support mechanism 7, which is located between the second end 43 of the expanded diameter column and the second protrusion 522. The elastic support mechanism 7 provides a certain reaction force to the locking nut 1, thereby preventing the locking nut 1 from loosening.

[0077] Specifically, the elastic support mechanism 7 mainly includes: a first movable ring 71, a second movable ring 72, a fixed rod 73, a movable rod 74, and a compression spring 75; the first movable ring 71 and the second movable ring 72 are both sleeved on the middle section 52, the first movable ring 71 can abut against the second end 43 of the expanded diameter column, and the second movable ring 72 can abut against the second protrusion 522; one end of the fixed rod 73 is fixed to the second movable ring 72, one end of the movable rod 74 is fixed to the first movable ring 71, and the other end is inserted into the fixed rod 73, and the compression spring 75 is located inside the movable rod 74, one end of the compression spring 75 is connected to the fixed rod 73, and the other end is connected to the movable rod 74.

[0078] When connecting the connector 5 to the test interface 81 on the test shell 8, firstly, the first sealing ring 2 is fitted onto the second shoulder 524, then the first movable ring 71 and the second movable ring 72 are fitted onto the middle section 52, then the expanding column 4 is fitted onto the middle section 52, then the second sealing ring 3 is fitted onto the first movable ring 71 and the second movable ring 72, then the threaded end 51 of the connector 5 is passed through the test interface 81 from right to left, then the connecting end 53 of the connector 5 is connected to the compression fitting of the suction pipe, then the locking nut 1 can be tightened, causing the expanding column 4 to move to the right, so that the inner diameter of the first end 31 of the second sealing ring is enlarged by the expanding column 4, and the first movable ring 71 is pushed to the right, so that the first movable ring 71 contacts the second movable ring 72. At this time, the compression spring 75 is in a compressed state and can exert a certain reaction force on the locking nut 1 to prevent the locking nut 1 from loosening.

[0079] Furthermore, through the arrangement of the first movable ring 71, the second movable ring 72, the fixed rod 73, the movable rod 74, and the compression spring 75, the elastic support mechanism 7 can not only exert a certain reaction force on the locking nut 1, but also support the second sealing ring 3, making it easier for the second end 43 of the expanding column to be inserted into the first end 31 of the second sealing ring, thereby expanding the inner diameter of the first end 31 of the second sealing ring. Specifically, when neither the first movable ring 71 nor the second movable ring 72 is compressed, the first movable ring 71 and the second movable ring 72 do not contact each other, and the first movable ring 71 and the second movable ring 72 are larger in the transverse dimension as a whole, which can better support the second sealing ring 3.

[0080] In this embodiment, preferably, one end of the movable rod 74 is fixed to the first movable ring 71 in the following manner: the first movable ring 71 has a receiving groove 711, and the movable rod 74 is fixed in the receiving groove 711 by a connecting ring 712. One end of the fixed rod 73 can be fixed to the second movable ring 72 in the same manner as described above.

[0081] To better support the second sealing ring 3, the elastic support mechanism 7 may further include a third movable ring 76 sleeved on the middle section 52, located between the first movable ring 71 and the second movable ring 72; the third movable ring 76 has a through hole 761, and a fixing ring 762 is fixed on the inner wall of the through hole 761, which is sleeved with the movable rod 74; a pushing block 741 is fixed on the movable rod 74, located between the fixing ring 762 and the second movable ring 72. When installing the connector 5, without the first movable ring 71 and the second movable ring 72 being compressed, the first movable ring 71, the third movable ring 76, and the second movable ring 72 do not need to contact each other. The first movable ring 71, the third movable ring 76, and the second movable ring 72 are larger in the transverse direction as a whole, which can better support the second sealing ring 3, so that the second end 43 of the expanded diameter column can be inserted into the first end 31 of the second sealing ring. During the process of moving the expansion column 4 to the left, the movable rod 74 and the first movable ring 71 can move to the left under the action of the compression spring 75. When the movable rod 74 moves to the left, it can also drive the fixed ring 762 and the third movable ring 76 to move to the left through the push block 741.

[0082] In conventional technical solutions, multiple springs are usually used to connect the various movable rings, while the elastic support mechanism 7 of this embodiment only needs to use one compression spring 75; in addition, by setting the fixed rod 73 and the movable rod 74, the first movable ring 71, the third movable ring 76 and the second movable ring 72 can also maintain a straight line distribution without being fitted onto the middle section 52.

[0083] In this embodiment, preferably, there are two third movable rings 76, with each push block 741 corresponding to a fixed ring 762. During the leftward movement of the movable rod 74, the two third movable rings 76 can be pushed successively by the corresponding push blocks 741, thereby causing the elastic support mechanism 7 to... Figure 4 The state shown.

[0084] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealed connection structure characterized by comprising: include: Lock the nut; First sealing ring; Second sealing ring; Expanded diameter column; and The connector includes a threaded end, an intermediate section, and a connecting end connected in sequence. The threaded end is used to connect to the locking nut, the intermediate section is inserted into the test interface on the test shell, and the connecting end is used to connect to the air extraction tube. in: The test interface on the test shell is located between the locking nut and the first sealing ring. The middle section has a first protrusion, which cooperates with the test shell to clamp the first sealing ring. The second sealing ring is fitted onto the middle section, and the outer side of the second sealing ring can abut against the inner side of the test interface on the test shell; The expanding column is sleeved on the middle section. The first end of the expanding column is in direct or spaced contact with the locking nut, and the second end can be inserted into the first end of the second sealing ring and expand the inner diameter of the first end of the second sealing ring. The expanding column and the test interface cooperate to fix the second sealing ring. The first end of the expanded diameter column has a third protrusion, and a third sealing ring is provided between the third protrusion and the test shell; The middle section has a second protrusion located between the first protrusion and the expanding post, and the second protrusion has a first shoulder on the side facing the expanding post. The second end of the second sealing ring is fitted onto the first shoulder, and the expanded diameter column, the first shoulder, and the test interface work together to fix the second sealing ring.

2. The sealed connection structure according to claim 1, characterized by A washer is provided between the first end of the expanded diameter column and the locking nut.

3. The sealed connection structure according to claim 1, wherein The third protrusion has an annular notch.

4. The sealed connection structure according to claim 1, wherein The second protrusion has a second shoulder on the side away from the expanding post, and the first protrusion, the second shoulder and the test shell cooperate to clamp the first sealing ring.

5. The sealed connection structure according to claim 1, wherein The sealing connection structure also includes an elastic support mechanism, which is located between the second end of the expanded diameter column and the second protrusion.

6. The sealed connection structure according to claim 5, wherein The elastic support mechanism includes: First activity circle; Second activity circle; Fixed rod; Movable lever; and Compression spring; in: Both the first movable ring and the second movable ring are fitted onto the middle section. The first movable ring can abut against the second end of the expanded diameter post, and the second movable ring can abut against the second protrusion. One end of the fixed rod is fixed to the second movable ring, one end of the movable rod is fixed to the first movable ring, and the other end is inserted into the fixed rod. The compression spring is located inside the movable rod, with one end connected to the fixed rod and the other end connected to the movable rod.

7. The sealed connection structure according to claim 6, wherein The first movable ring has a receiving groove, and the movable rod is fixed in the receiving groove by a connecting ring.

8. The sealed connection structure according to claim 6, wherein The elastic support mechanism further includes a third movable ring sleeved on the middle section, the third movable ring being located between the first movable ring and the second movable ring; The third movable ring has a through hole, and a fixing ring is fixed on the inner wall of the through hole. The fixing ring is sleeved with the movable rod. A pushing block is fixed on the movable rod, and the pushing block is located between the fixing ring and the second movable ring.

9. The sealed connection structure according to claim 8, wherein There are two third movable rings, and the pushing block corresponds to the fixed ring one by one.

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