Pressure relief valve for protecting oil-immersed electrical equipment

Abstract

The utility model relates to the field of transformer components, in particular to a pressure relief valve for protecting oil-immersed electrical equipment, which comprises a valve body, the valve body comprises a valve seat, a valve cover, a valve cover and a junction box, the top of the valve seat is sleeved with the valve cover, the top of the valve cover is fixedly connected with the valve cover, the junction box is arranged on the outer wall of the valve cover, and a plurality of groups of pressure relief ports are arranged on the outer wall of the valve cover. A liquid inlet penetrates through the bottom of the valve seat; the pressure relief mechanism comprises threaded rods, a fixed disc, a membrane disc and a signal rod, a plurality of sets of threaded rods are arranged at the top of the valve seat, and the fixed disc is connected between the threaded rods through bolts; the negative pressure mechanism comprises a membrane disc, a valve disc and a negative pressure disc, the valve disc is rotationally connected into the membrane disc, and the negative pressure disc is rotationally connected to the bottom of the membrane disc; the normal pressure applying process of the oil tank is completed through the cooperation of the valve body and the pressure releasing mechanism, and the pressure applying process of the oil tank is further completed through the cooperation of the pressure releasing mechanism and the negative pressure mechanism, so that the normal pressure of the oil tank is further maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer assembly field especially a pressure release valve for protecting oil immersed electrical equipment. BACKGROUND

[0002] At present, the pressure release valve is a kind of pressure protection device of transformer, when there is serious fault inside transformer, oil decomposes and produces a large amount of gas. Since transformer is basically closed object, the diameter of connecting pipe connected with oil conservator is relatively small, and only connecting pipe connected with oil conservator cannot effectively and rapidly reduce pressure, causes the pressure in oil tank to rise sharply, can lead to the rupture of transformer oil tank. Pressure release valve will open in time, removes part of transformer oil, reduces the pressure in oil tank. After the pressure in oil tank reduces, pressure release valve will be automatically closed, keeps the sealing of oil tank.

[0003] The following problems exist at present;

[0004] Most of the existing pressure release valves only support the positive pressure release of oil tank, but the negative pressure can be generated in the oil tank by factors such as air extraction or temperature, and when the negative pressure in the oil tank cannot be released, the oil tank will also be deformed and damaged. SUMMARY

[0005] The purpose of this section is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments, which may be simplified or omitted in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplification or omission cannot be used to limit the scope of the utility model.

[0006] In view of the above and / or problems existing in the prior art, the utility model is proposed.

[0007] Therefore, the first technical problem to be solved by the utility model is that most of the existing pressure release valves only support the positive pressure release of oil tank, but the negative pressure can be generated in the oil tank by factors such as air extraction or temperature, and when the negative pressure in the oil tank cannot be released, the oil tank will also be deformed and damaged.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a pressure relief valve for protecting oil-immersed electrical equipment, comprising a valve body, the valve body including a valve seat, a valve cover, a valve cap, and a junction box, the valve cover being sleeved on the top of the valve seat, the valve cap being fixedly connected to the top of the valve cover, the junction box being provided on the outer wall of the valve cover, and several sets of pressure relief ports being opened on the outer wall of the valve cover, and a liquid inlet being provided through the bottom of the valve seat; a pressure relief mechanism, the pressure relief mechanism including a threaded rod, a fixed disc, a diaphragm disc, and a signal rod, several sets of threaded rods being provided on the top of the valve seat, the fixed disc being bolted to the several sets of threaded rods, a first spring being connected to the bottom of the fixed disc, the other end of the first spring being connected to the diaphragm disc, a signal rod being provided on the top of the outer wall of the diaphragm disc, the signal rod being slidably connected inside the fixed disc and inside the valve cap; a negative pressure mechanism, the negative pressure mechanism including a diaphragm disc, a valve disc, and a negative pressure disc, the valve disc being rotatably connected inside the diaphragm disc, and the negative pressure disc being rotatably connected to the bottom of the diaphragm disc.

[0009] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, the diaphragm is disposed between several sets of threaded rods, and the diaphragm is placed on top of the valve seat and closes the inlet.

[0010] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, the fixed plate is slidably connected between several sets of threaded rods by bolts, and the fixed plate, diaphragm plate, signal rod and valve body are all coaxially arranged.

[0011] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, a sealing ring is provided at the bottom of the outer wall of the diaphragm, and the bottom edge of the outer wall of the diaphragm is tightly fitted with the inner wall of the valve cover.

[0012] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, the diaphragm disc has a first through groove extending through the top of its outer wall, the valve disc has a second through groove extending through the center of its top axis, the negative pressure disc has a connecting bolt fixedly connected to the center of its top axis, the connecting bolt passing through the first through groove and the second through groove in sequence, and the valve disc is rotatably connected inside the inner groove of the diaphragm disc.

[0013] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, a limiting ball is provided on the outer wall of the connecting bolt, and a spiral limiting groove is provided on the inner wall of the second through groove, wherein the limiting ball is slidably connected inside the limiting groove.

[0014] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, wherein: a first negative pressure port is provided through the top of the outer wall of the diaphragm disc at a non-axial location, and a second negative pressure port is provided through the top of the outer wall of the valve disc at a non-axial location.

[0015] As a preferred embodiment of the pressure relief valve for protecting oil-immersed electrical equipment described in this utility model, a limiting rod is provided at the bottom of the outer wall of the diaphragm, a connecting hole is provided through the outer wall of the negative pressure plate, the limiting rod passes through the connecting hole, a second spring is connected to the outer wall of the limiting rod, and the other end of the second spring is fixedly connected to the negative pressure plate.

[0016] The beneficial effects of this utility model are as follows: the normal pressurization process of the oil tank is completed by the cooperation of the valve body and the pressure relief mechanism, and the pressurization process of the oil tank is further completed by the cooperation of the pressure relief mechanism and the negative pressure mechanism, thereby further maintaining the normal pressure inside the oil tank. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 A schematic diagram of the overall structure of a pressure relief valve for protecting oil-immersed electrical equipment provided by this utility model;

[0019] Figure 2 A schematic diagram of the pressure relief mechanism in a pressure relief valve for protecting oil-immersed electrical equipment provided by this utility model;

[0020] Figure 3 A top-view structural diagram of a diaphragm disc in a pressure relief valve for protecting oil-immersed electrical equipment, provided by this utility model;

[0021] Figure 4 A schematic diagram of the diaphragm disc in a pressure relief valve for protecting oil-immersed electrical equipment, as shown in the present invention, viewed from below.

[0022] Figure 5 A schematic diagram of the negative pressure mechanism in a pressure relief valve for protecting oil-immersed electrical equipment provided by this utility model;

[0023] Figure 6 for Figure 5 Enlarged structural diagram of region A in the middle;

[0024] Figure 7 forFigure 5 A magnified structural diagram of region B in the middle. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0028] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0029] Example 1

[0030] Reference Figures 1 to 7This embodiment provides a pressure relief valve for protecting oil-immersed electrical equipment, including a valve body 100. The valve body 100 includes a valve seat 101, a valve cover 102, a valve cap 103, and a junction box 104. The valve cover 102 is sleeved on the top of the valve seat 101, and the valve cap 103 is fixedly connected to the top of the valve cover 102. The junction box 104 is provided on the outer wall of the valve cover 102, and several sets of pressure relief ports 102a are opened on the outer wall of the valve cover 102. A liquid inlet is provided through the bottom of the valve seat 101. A pressure relief mechanism 200 includes a threaded rod 201, a fixed plate 202, a diaphragm plate 203, and a signal rod 204. The valve seat 101 has several sets of threaded rods 201 on its top. The sets of threaded rods 201 are connected to a fixed plate 202 by bolts. The bottom of the fixed plate 202 is connected to a first spring. The other end of the first spring is connected to a diaphragm 203. The top of the outer wall of the diaphragm 203 is provided with a signal rod 204. The signal rod 204 is slidably connected inside the fixed plate 202 and inside the valve cover 103. The negative pressure mechanism 300 includes a diaphragm 203, a valve plate 301 and a negative pressure plate 302. The valve plate 301 is rotatably connected inside the diaphragm 203 and the negative pressure plate 302 is rotatably connected to the bottom of the diaphragm 203.

[0031] The diaphragm 203 is disposed among several sets of threaded rods 201, and the diaphragm 203 is placed on top of the valve seat 101 and closes the inlet.

[0032] The fixed plate 202 is slidably connected to several sets of threaded rods 201 by bolts. The fixed plate 202, diaphragm 203, signal rod 204 and valve body 100 are all coaxially arranged. The height of the fixed plate 202 can be changed by bolts, and the elastic force of the first spring can be controlled by changing the height of the fixed plate 202 to adapt to the pressure relief requirements of the diaphragm 203 under different conditions.

[0033] A sealing ring is provided at the bottom of the outer wall of the diaphragm plate 203, and the bottom edge of the outer wall of the diaphragm plate 203 is tightly fitted to the inner wall of the valve cover 102.

[0034] A first through groove 203a is provided through the top of the outer wall of the diaphragm disc 203, and a second through groove 301a is provided through the center of the top of the outer wall of the valve disc 301. A connecting bolt 302a is fixedly connected to the center of the top of the outer wall of the negative pressure disc 302. The connecting bolt 302a passes through the first through groove 203a and the second through groove 301a in sequence. The valve disc 301 is rotatably connected inside the inner groove 203b of the diaphragm disc 203.

[0035] A limiting ball is provided on the outer wall of the connecting bolt 302a, and a spiral limiting groove 301b is provided on the inner wall of the second through groove 301a. The limiting ball is slidably connected inside the limiting groove 301b. When the connecting bolt 302a slides up and down inside the second through groove 301a, the valve disc 301 is driven to rotate inside the inner groove 203b by the sliding of the limiting ball inside the limiting groove 301b.

[0036] A first negative pressure port 203c is provided at the top of the outer wall of the diaphragm plate 203 at a non-axial position, and a second negative pressure port 301c is provided at the top of the outer wall of the valve plate 301 at a non-axial position. When a negative pressure occurs inside the oil tank, gas can pass through the first negative pressure port 203c and the second negative pressure port 301c in sequence to complete the pressurization of the oil tank.

[0037] A limiting rod 203d is provided at the bottom of the outer wall of the membrane plate 203. A connecting hole 302b is provided through the outer wall of the negative pressure plate 302. The limiting rod 203d passes through the connecting hole 302b. A second spring 203e is connected to the outer wall of the limiting rod 203d. The other end of the second spring 203e is fixedly connected to the negative pressure plate 302.

[0038] Working principle: Under normal circumstances, the diaphragm 203 is pressed against the outlet of the valve seat 101 by the elastic force provided by the first spring, thus sealing the outlet. When the pressure inside the oil tank is too high, the pressure inside the oil tank will be transmitted to the diaphragm 203 through the inlet, causing the diaphragm 203 to move the negative pressure mechanism 300 upward. The excess pressure inside the oil tank will be discharged through the pressure relief port 102a. When the diaphragm 203 moves upward, it will also move the signal rod 204 upward, thus serving as a warning. When the pressure inside the oil tank is too low, the pressure inside the oil tank will... This causes the negative pressure plate 302 to move downwards. When the negative pressure plate 302 moves downwards, the connecting bolt 302a slides up and down inside the second through groove 301a of the valve plate 301, and causes the limiting ball to slide inside the limiting groove 301b. This causes the valve plate 301 to rotate inside the inner groove 203b of the diaphragm plate 203. When the valve plate 301 rotates to the point where the second negative pressure port 301c coincides with the first negative pressure port 203c, the external gas will pass through the first negative pressure port 203c, the second negative pressure port 301c and the gap between the diaphragm plate 203 and the negative pressure plate 302 in sequence to complete the pressure passage.

[0039] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0040] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to the implementation of the present invention) may be omitted.

[0041] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pressure relief valve for protecting an oil immersed electrical apparatus, characterized by: The utility model provides a valve body (100) including valve seat (101), valve cover (102), valve cover (103) and terminal box (104), valve seat (101) top sleeve joint has valve cover (102), valve cover (102) top fixedly connected has valve cover (103), valve cover (102) outer wall is provided with terminal box (104), valve cover (102) outer wall is opened and is equipped with several groups pressure relief port (102a), valve seat (101) bottom is equipped with liquid inlet through opening, The pressure relief mechanism (200) includes threaded rods (201), a fixed disc (202), a membrane disc (203), and a signal rod (204). The valve seat (101) top is provided with several groups of threaded rods (201), and the fixed disc (202) is connected between the several groups of threaded rods (201) through bolts. The bottom of the fixed disc (202) is connected with a first spring, and the other end of the first spring is connected with the membrane disc (203). The outer wall top of the membrane disc (203) is provided with a signal rod (204), which is slidingly connected inside the fixed disc (202) and the valve cover (103). The negative pressure mechanism (300) includes a membrane disc (203), a valve disc (301), and a negative pressure disc (302). The valve disc (301) is rotatably connected inside the membrane disc (203), and the negative pressure disc (302) is rotatably connected to the bottom of the membrane disc (203).

2. A pressure relief valve for protecting oil immersed electrical equipment according to claim 1, characterized in that: The membrane disc (203) is placed between the several groups of threaded rods (201) and closes the liquid inlet on the top of the valve seat (101).

3. A pressure relief valve for protecting oil immersed electrical equipment according to claim 2, characterized in that: The fixed disc (202) is slidingly connected between the several groups of threaded rods (201) through bolts. The fixed disc (202), the membrane disc (203), the signal rod (204), and the valve body (100) are coaxially arranged.

4. A pressure relief valve for protecting oil immersed electrical equipment according to claim 3, characterized in that: The outer wall bottom of the membrane disc (203) is provided with a sealing ring, and the outer wall bottom edge of the membrane disc (203) is tightly attached to the inner wall of the valve cover (102).

5. A pressure relief valve for protecting oil immersed electrical equipment according to claim 4, characterized in that: The outer wall top of the membrane disc (203) is provided with a first through groove (203a), the outer wall top of the valve disc (301) is provided with a second through groove (301a), and the outer wall top of the negative pressure disc (302) is fixedly connected with a connecting bolt (302a). The connecting bolt (302a) penetrates the first through groove (203a) and the second through groove (301a) in sequence, and the valve disc (301) is rotatably connected inside the inner groove (203b) of the membrane disc (203).

6. A pressure relief valve for protecting oil immersed electrical equipment according to claim 5, characterized in that: The outer wall of the connecting bolt (302a) is provided with a limiting ball, and the inner wall of the second through groove (301a) is provided with a spiral limiting groove (301b). The limiting ball is slidingly connected inside the limiting groove (301b).

7. A pressure relief valve for protecting oil immersed electrical equipment according to claim 6, characterized in that: The outer wall top of the membrane disc (203) is provided with a first negative pressure port (203c) at a non-axis center, and the outer wall top of the valve disc (301) is provided with a second negative pressure port (301c) at a non-axis center.

8. A pressure relief valve for protecting oil immersed electrical equipment according to claim 7, characterized in that: The outer wall bottom of the film disc (203) is provided with a limiting rod (203d), the outer wall of the negative pressure disc (302) is provided with a connecting hole (302b) penetratingly, the limiting rod (203d) penetrates the connecting hole (302b), the outer wall of the limiting rod (203d) is connected with a second spring (203e), and the other end of the second spring (203e) is fixedly connected with the negative pressure disc (302).

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