Sealing structure of gas relay

Abstract

The utility model relates to the technical field of power equipment, in particular to a sealing structure of a gas relay. Comprising a relay body, a cover body and a sealing assembly, the cover body is provided with an open containing cavity, the relay body is covered with the cover body, the sealing assembly is arranged between the cover body and the upper surface of the relay body in the circumferential direction of the open end of the cover body, the sealing assembly comprises a sealing ring and a fixing ring, and the sealing ring is arranged on the inner side wall of the cover body; the end of the fixing ring protrudes out of the end face of the open end of the cover body, and the fixing ring is connected with the inner side wall of the sealing ring and used for fixing the sealing ring. When the cover body covers the relay body, the sealing ring realizes sealing between the cover body and the relay body, and a probe and a deflation plug on the relay body are sealed in a sealing cavity formed by the cover body and the upper surface of the relay, so that the probe and the deflation plug are prevented from being damaged by external rainwater and pollutants; the sealing performance of the gas relay is improved, and the use safety is further improved.

Description

Sealing structure of gas relay Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a sealing structure for a gas relay. Background Technology

[0002] A gas relay is a protective device for oil-immersed transformers. It is installed between the oil conservator and the oil tank. According to the installation process requirements, the transformer with the gas relay installed should have a slope of 1%-1.5% during installation. When there is an internal fault in the transformer, the oil decomposes to produce gas or causes oil flow to surge, which causes the contacts of the gas relay to operate, connect the designated control circuit, and promptly issue a signal alarm (light gas) or activate the protective element to automatically disconnect the transformer (heavy gas).

[0003] Most oil-immersed transformers are installed outdoors, and their gas relays require rain protection. Currently, the side of the gas relay with the probe and vent plug lacks an edge, allowing external rainwater and contaminants to easily enter through the joints, affecting the probe and vent plug, and potentially damaging the gas relay in severe cases. This problem urgently needs to be solved. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a sealing structure for a gas relay.

[0005] This application provides a sealing structure for a gas relay, including a relay body, a cover, and a sealing assembly. The cover has an open receiving cavity and covers the top of the relay body. The sealing assembly is disposed circumferentially between the cover and the upper surface of the relay body along the open end of the cover. The sealing assembly includes a sealing ring and a fixing ring. The sealing ring is disposed on the inner sidewall of the cover and its end protrudes from the end face of the open end of the cover. The fixing ring is connected to the inner sidewall of the sealing ring for fixing the sealing ring.

[0006] In some embodiments, the sealing ring includes a first sealing portion and a second sealing portion connected to each other, the first sealing portion being fitted to the inner sidewall of the cover, and the second sealing portion being fitted to the end face of the open end of the cover.

[0007] In some embodiments, the retaining ring includes a body portion and a rolled edge portion, the rolled edge portion being formed on the side of the body portion opposite to the sealing ring.

[0008] In some embodiments, the rolled edge is formed by bending the end of the body portion.

[0009] In some embodiments, a fixing portion is formed on the side of the body portion facing the sealing ring, and the fixing portion is inserted into the sealing ring.

[0010] In some embodiments, the fixing part is a barb that is inclined downward along the outer surface of the body part.

[0011] In some embodiments, the number of barbs is multiple, and the multiple barbs are arranged at circumferential intervals along the body portion.

[0012] In some embodiments, the width of the first sealing portion gradually increases along the direction away from the open end of the cover.

[0013] In some embodiments, the opening of the first sealing portion gradually decreases along the direction away from the open end of the cover.

[0014] In some embodiments, the cross-section of the first sealing portion is a tapered surface, and the taper of the tapered surface is greater than or equal to 2° and less than or equal to 3°.

[0015] The technical solution provided in this application has the following advantages compared with the prior art:

[0016] The gas relay sealing structure provided in this application embodiment has a sealing ring circumferentially arranged at the open end of the cover, and the sealing ring is fixed by a fixing ring. When the cover is closed on top of the relay body, the sealing ring achieves a seal between the cover and the relay body, sealing the probe and vent plug on the relay body in the sealed cavity formed by the upper surface of the cover and the relay, thereby preventing external rainwater and pollutants from damaging the probe and vent plug, improving the sealing performance of the gas relay, and thus improving the safety of use. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] 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 or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the structure of the gas relay described in an embodiment of this application;

[0020] Figure 2 is a partial cross-sectional view of the gas relay described in the embodiment of this application;

[0021] Figure 3 is a bottom view of the cover body according to an embodiment of this application;

[0022] Figure 4 shows the sectional view along direction AA in Figure 3;

[0023] Figure 5 is a magnified view of point B in Figure 4.

[0024] Among them, 1. Relay body; 101. Probe; 102. Vent plug;

[0025] 2. Cover; 201. Receiving cavity;

[0026] 3. Sealing assembly; 310. Sealing ring; 311. First sealing part; 312. Second sealing part; 302. Retaining ring; 321. Barb; 322. Rolled edge. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0029] As shown in Figures 1 to 5, this application embodiment provides a sealing structure for a gas relay, including a relay body 1, a cover 2, and a sealing assembly 3. The upper surface of the relay body 1 is provided with a probe 101 and a vent plug 102. The probe 101 is similar to a compression spring and its function is for the overall testing of heavy gas. Pressing the probe 101 causes the baffle to shift, simulating the scenario of a large amount of gas and oil flow impacting the baffle during a transformer internal fault, thereby verifying the reliability and sensitivity of the heavy gas protection operation. Through this test, it can be ensured that when a serious fault actually occurs in the transformer, the heavy gas protection can operate promptly and accurately, cutting off the transformer power supply, preventing the fault from escalating, and protecting the safety of the transformer and the power system.

[0030] When a transformer undergoes operations such as oil changing and oil filtration, some air inevitably gets introduced. This air gradually accumulates in the upper part of the gas relay. When the amount of gas reaches a certain level, it will trigger a light gas alarm. At this time, by opening the vent plug 102, the air inside the relay can be released, preventing the gas protection from malfunctioning due to gas accumulation.

[0031] When a transformer malfunctions, the oil decomposes to produce various gases, which enter the gas relay. Gas samples can be collected from the relay via the vent plug 102, and the gas composition can be analyzed to determine the type and nature of the internal transformer fault, providing a basis for fault handling. For example, a high acetylene content in the gas may indicate a discharge fault inside the transformer; a high hydrogen content may be caused by localized overheating inside the transformer.

[0032] In order to protect the probe 101 and the vent plug 102, in some embodiments of this application, a cover 2 is provided above the relay body 1. The cover 2 protrudes upward and forms an open receiving cavity 201 on its lower surface. The cover 2 covers the top of the relay body 1 and encloses the probe 101 and the vent plug 102 in the receiving cavity 201.

[0033] To prevent external rainwater or contaminants from entering the probe 101 or vent plug 102 from the connection between the cover 2 and the relay body 1, the sealing assembly 3 is circumferentially disposed between the cover 2 and the upper surface of the relay body 1 along the open end of the cover 2. Specifically, the sealing assembly 3 of this application includes a sealing ring 310 and a fixing ring 302. The sealing ring 310 is disposed on the inner sidewall of the cover 2, and its end protrudes from the end face of the open end of the cover 2. When the cover 2 is closed on the probe 101 and the vent plug 102, a sealing structure is formed at the connection between the cover 2 and the relay body 1, so that the space enclosed by the upper surface of the cover 2 and the relay body 1 forms a sealed space. The probe 101 and the vent plug 102 are located within this sealed space, avoiding the influence of external rainwater and contaminants.

[0034] As shown in Figure 5, in some embodiments of this application, the sealing ring 310 includes a first sealing portion 311 and a second sealing portion 312 connected to each other. The first sealing portion 311 is fitted against the inner wall of the cover 2, and the second sealing portion 312 is fitted against the end face of the open end of the cover 2. The first sealing portion 311 provides a position for fixing the sealing ring 310 to the cover 2, and the second sealing portion 312 is used to seal the connection between the cover 2 and the relay body 1.

[0035] Specifically, in some embodiments of this application, the open end of the cover 2 is bent outward to form a flange, and the second sealing part 312 is fitted with the flange, which increases the fitting area between the second sealing part 312 and the cover 2, thereby increasing the sealing area between the cover 2 and the upper surface of the relay body 1 and improving the sealing effect.

[0036] The sealing ring 310 has an overall L-shaped cross-section. Without the first sealing part 311, the second sealing part 312 would need to be fixed to the cover 2 with glue or other fasteners. However, glue fixation can lead to cracking and seal failure over time; other fasteners may also affect the sealing effect. In this embodiment, the fixing ring 302 fixes the sealing ring 310 at the first sealing part 311. This does not affect the sealing effect of the second sealing part 312. Furthermore, the first sealing part 311 seals the inner side of the second sealing part 312, preventing rainwater from entering the cover 2 through the space between the second sealing part 312 and the cover 2, thus further improving the sealing effect.

[0037] In some embodiments of this application, the fixing ring 302 includes a body portion and a rolled edge portion 322, the rolled edge portion 322 being formed on the side of the body portion facing away from the sealing ring 310. The body portion presses the first sealing portion 311 against the inner wall of the cover plate to fix the sealing ring 310. The cross-sectional shape of the rolled edge portion 322 is annular, which enhances the overall structural strength of the fixing ring 302, reduces deformation over long-term use, and improves the stability of the fixing structure of the sealing ring 310.

[0038] In some embodiments of this application, the rolled edge portion 322 is formed by bending the end of the body portion. Specifically, the body portion is bent away from the first sealing ring 310 at both ends along its axial direction (that is, the end closer to the open end of the cover plate and the end away from the open end of the cover plate), then bent towards each other, and finally bent towards the body portion to form an annular rolled edge portion 322 to enhance the strength of the fixing ring 302.

[0039] In some embodiments of this application, a fixing part is formed on the side of the main body facing the sealing ring 310, and the fixing part is inserted into the sealing ring 310. The sealing ring 310 is made of rubber, and the fixing ring 302 is made of metal, such as stainless steel. The fixing ring 302 has higher hardness, while the sealing ring 310 has lower hardness. When installing the fixing member and the sealing ring 310, the fixing part is inserted into the sealing ring 310.

[0040] In some embodiments of this application, the fixing part is a barb 321 that is inclined downward along the outer surface of the body. Specifically, a V-shaped opening is made on the body, and then the formed V-shaped plate is bent outward to form the downwardly inclined barb 321. In use, the barb 321 is inserted into the first sealing part 311 at an inclined downward. When the barb 321 is fully inserted, the first sealing part 311 and the second sealing part 312 are installed in place. At this time, the sealing ring 310 cannot continue to move downward. Since the second sealing part 312 is in contact with the end face of the open end of the cover plate, the cover plate prevents the second sealing part 312 from moving upward, thereby achieving stable installation of the sealing ring 310.

[0041] In some embodiments of this application, the barbs 321 are formed by a stamping process, which facilitates processing.

[0042] In some embodiments of this application, there are multiple barbs 321, which are spaced apart circumferentially along the body. By providing multiple barbs 321 circumferentially along the body, multiple points of fixation are formed with the sealing ring 310, making the installation structure of the sealing ring 310 more stable.

[0043] In some embodiments of this application, the width of the first sealing portion 311 gradually increases along the direction away from the open end of the cover 2. The side of the first sealing portion 311 that is in contact with the inner wall of the cover plate is the outer side, and the side of the first sealing portion 311 that faces away from the inner wall of the cover plate is the inner side. The vertical distance between the outer side and the inner side is the width of the first sealing portion 311. When the cover 2 is closed over the relay body 1, the first sealing portion 311 gradually widens from bottom to top.

[0044] In some embodiments of this application, the opening of the first sealing part 311 gradually decreases in size along the direction away from the open end of the cover 2. It can be understood that the inner surface of the first sealing part 311 is a conical surface that is smaller at the top and larger at the bottom. If the fixing ring 302 becomes loose during long-term use, the fixing ring 302 can be moved in the direction away from the open end of the cover 2 (upward) so that the fixing ring 302 and the first sealing part 311 are pressed together again, which is convenient for adjustment.

[0045] Furthermore, in some embodiments of this application, the cross-section of the first sealing portion 311 is a tapered surface, and the taper of the tapered surface is greater than or equal to 2° and less than or equal to 3°. Specifically, in some embodiments, the taper of the tapered surface is 2.5°. This configuration facilitates the fixing of the sealing ring 310, and the sealing ring 310 will not interfere with the electrical components on the relay.

[0046] In some embodiments of this application, clearance notches or clearance grooves can be provided on the sealing ring 310 and the fixing ring 302 at positions corresponding to the bolt locations on the cover 2 to avoid interference, thereby ensuring that the periphery of the cover 2 can be sealed in place.

[0047] In summary, the sealing structure of the gas relay provided in this application embodiment, without changing the original structure of the gas relay, seals the probe 101 and the vent plug 102 by adding a sealing component 3, which is low in cost and has high practical value.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing structure for a gas relay, characterized in that, The device includes a relay body, a cover, and a sealing assembly. The cover has an open receiving cavity and covers the top of the relay body. The sealing assembly is disposed circumferentially between the cover and the upper surface of the relay body along the open end of the cover. The sealing assembly includes a sealing ring and a fixing ring. The sealing ring is disposed on the inner sidewall of the cover and its end protrudes from the end face of the open end of the cover. The fixing ring is connected to the inner sidewall of the sealing ring for fixing the sealing ring.

2. The sealing structure of the gas relay according to claim 1, characterized in that, The sealing ring includes a first sealing part and a second sealing part that are connected to each other. The first sealing part is fitted to the inner sidewall of the cover, and the second sealing part is fitted to the end face of the open end of the cover.

3. The sealing structure of a gas relay according to claim 1, wherein The retaining ring includes a body portion and a rolled edge portion, the rolled edge portion being formed on the side of the body portion opposite to the sealing ring.

4. The sealing structure of the gas relay according to claim 3, characterized in that, The rolled edge is formed by bending the end of the body portion.

5. The sealing structure of the gas relay according to claim 3, characterized in that, A fixing part is formed on the side of the main body facing the sealing ring, and the fixing part is inserted into the sealing ring.

6. The sealing structure of a gas relay according to claim 5, wherein The fixing part is a barb that is inclined downward along the outer surface of the body part.

7. The sealing structure of the gas relay according to claim 6, characterized in that, The number of barbs is multiple, and the multiple barbs are arranged at intervals along the circumference of the body.

8. The sealing structure of a gas relay according to claim 2, wherein The width of the first sealing portion gradually increases along the direction away from the open end of the cover.

9. The sealing structure of the gas relay according to claim 8, characterized in that, The opening of the first sealing part gradually decreases in the direction away from the open end of the cover.

10. The sealing structure of a gas relay according to claim 8, wherein The cross-section of the first sealing part is a conical surface, and the taper of the conical surface is greater than or equal to 2° and less than or equal to 3°.

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