Pressure relief valve for oil-immersed transformer

Abstract

The utility model relates to the technical field of pressure relief valves, and discloses a pressure relief valve for an oil-immersed transformer, which is applied to the transformer and comprises a valve seat, a valve cover, a diaphragm disc, an adjusting disc, a marker post, a spring, a valve cover and a microswitch. During use, when the internal pressure of the transformer abnormally rises and reaches a preset threshold value, the pressure borne by the diaphragm disc can overcome the elastic force of the spring to move. At the moment, high-pressure gas can be released into the atmosphere through the second through hole and the pressure relief hole, and therefore pressure relief operation is completed. Moreover, the adjusting disc is mounted on the valve cover through the first external thread and the first internal thread, so that the position of the adjusting disc relative to the valve cover can be changed by screwing the adjusting disc, and the compression amount of the spring can be changed conveniently. When the production sizes of the valve seat, the valve bonnet and the like are deviated, the elastic force of the spring to the diaphragm disc can be kept certain by changing the position of the adjusting disc, and therefore the action consistency of the pressure relief valve is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure relief valves, and particularly relates to a pressure relief valve for oil-immersed transformers. BACKGROUND

[0002] A pressure relief device for oil-immersed transformers is disclosed in related technology (publication number: CN210575433U), which is installed at a transformer oil tank. The pressure relief device comprises a sealing gasket and a side sealing gasket. A valve disc is pressed against the sealing gasket under the action of a spring set. A gland is fixed to an outer cover by a screw, and the spring set is compressed. The pressure relief device is installed on a transformer oil tank flange through a flange, and is fixed through mounting holes on the outer cover. A signal rod is arranged in the pressure relief device, and a signal rod top cap is arranged at the end of the signal rod. A micro switch is arranged in the pressure relief device.

[0003] In the process of implementing the technical scheme of the present disclosure, it is found that at least the following problems exist in the related technology:

[0004] The pressure relief device for oil-immersed transformers can be compressed when the pressure in the transformer oil tank reaches the safety limit, so that the pressure disc is lifted, and the pressure in the oil tank can be reliably released. However, it is inconvenient to adjust the compression amount of the compression spring, and when the production size of each part of the pressure relief valve deviates, it is difficult to ensure the action consistency of the pressure relief valve.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] In order to have a basic understanding of some aspects of the disclosed technical scheme, a brief summary is given below. The summary is not a general review, nor does it determine the key / important elements or delineate the protection scope of the technical scheme, but serves as a prelude to the detailed description below.

[0007] The technical scheme of the present disclosure provides a pressure relief valve for oil-immersed transformers to solve the problems raised in the background technology.

[0008] In some embodiments, the pressure relief valve for oil-immersed transformer is applied to a transformer, and comprises a valve seat connected to a box or a raised seat of the transformer, a valve cover installed on an outer wall of the valve seat, a diaphragm disc located inside the valve cover and covered on a top end of the valve seat, an adjusting disc installed on an inner wall of the valve cover, the adjusting disc comprising a first through hole located at a center of the adjusting disc and second through holes uniformly distributed around the first through hole, a marker rod slidably penetrating through the first through hole, a bottom end of the marker rod being connected to the diaphragm disc, a spring sleeved on the marker rod and located between the diaphragm disc and the adjusting disc, a valve cover installed on a top end of the valve cover and sleeved on a top end of the marker rod, and a micro switch installed on an inner wall of the valve cover, a detection end of the micro switch facing the marker rod, wherein the adjusting disc comprises a first outer thread on an outer wall thereof, the valve cover comprises a first inner thread on an inner wall thereof, the first inner thread matches the first outer thread, and the adjusting disc is installed on the valve cover through the first outer thread and the first inner thread.

[0009] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0010] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0011] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0012] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0013] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0014] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0015] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0016] Optionally, the valve seat comprises a second outer thread on an outer wall thereof, the valve cover comprises a second inner thread on an inner wall thereof, the second inner thread matches the second outer thread, and the valve cover is installed on the valve seat through the second inner thread and the second outer thread.

[0017] The oil-immersed transformer pressure release valve provided by the technical scheme of the present disclosure can achieve the following technical effects:

[0018] The oil-immersed transformer pressure release valve provided by the technical scheme of the present disclosure is applied to a transformer and comprises a valve seat, a valve cover, a diaphragm disc, an adjusting disc, a marker rod, a spring, a valve cover and a micro switch. The valve seat is used to be connected with a box body or a raised seat of the transformer. The valve cover is installed on the outer wall of the valve seat and can be detachably installed between the valve cover and the valve seat. The valve cover comprises a pressure relief hole in the side wall thereof, and the pressure relief hole is used to release pressure. The diaphragm disc is located in the interior of the valve cover and is arranged at the top end of the valve seat to seal the top end of the valve seat. The adjusting disc is installed on the inner wall of the valve cover and comprises a first through hole and a plurality of second through holes. The first through hole is located at the center of the adjusting disc and is used to pass through the marker rod. The second through holes are uniformly distributed around the first through hole and are all used to release pressure. The marker rod is slidably arranged in the first through hole, and the bottom end of the marker rod is connected with the diaphragm disc. The marker rod moves synchronously with the diaphragm disc and can slide relative to the adjusting disc. The spring is sleeved on the marker rod and is located between the diaphragm disc and the adjusting disc to provide elastic force so that the diaphragm disc seals the bottom end of the valve seat. The valve cover is sleeved on the top end of the marker rod and surrounds the top end of the valve cover to seal the top end of the valve cover. The micro switch is installed on the inner wall of the valve cover, and the detection end of the micro switch faces the marker rod to detect the position of the marker rod. The adjusting disc comprises a first external thread on the outer wall thereof, the valve cover comprises a first internal thread on the inner wall thereof, the first internal thread matches the first external thread, and the adjusting disc is installed on the valve cover through the first external thread and the first internal thread.

[0019] When the internal pressure of the transformer abnormally rises to reach a preset threshold value during use, the pressure acting on the diaphragm disc can overcome the elastic force of the spring to move. At this time, the high-pressure gas can be released to the atmosphere through the second through holes and the pressure relief hole, thereby completing the pressure relief operation. At the same time, the marker rod slides relative to the adjusting disc under the driving of the diaphragm disc, thereby triggering the micro switch. After the micro switch is triggered, the circuit state is immediately switched, and an explicit alarm signal is sent to the external monitoring system through the terminal post. Moreover, since the adjusting disc is installed on the valve cover through the first external thread and the first internal thread, the position of the adjusting disc relative to the valve cover can be changed by screwing the adjusting disc, thereby facilitating the change of the compression amount of the spring. When the production sizes of the valve seat and the valve cover deviate, the position of the adjusting disc is changed, so that the elastic force of the spring acting on the diaphragm disc is kept constant, thereby ensuring the action consistency of the pressure release valve.

[0020] The foregoing general description and the following description are only exemplary and explanatory and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the present embodiments. Like numbers refer to like elements throughout the drawings, which are not necessarily to scale, and in which:

[0022] Figure 1 is a cross-sectional structure schematic diagram of a pressure relief valve for an oil-immersed transformer provided by an embodiment of the present disclosure;

[0023] Figure 2 is a rear view structure schematic diagram provided by an embodiment of the present disclosure;

[0024] Figure 3 is a perspective structure schematic diagram provided by an embodiment of the present disclosure;

[0025] Figure 4 is a front view structure schematic diagram of a pressure relief valve for an oil-immersed transformer after disassembling a valve cover provided by an embodiment of the present disclosure;

[0026] Figure 5 is a perspective structure schematic diagram of a pressure relief valve for an oil-immersed transformer after disassembling a valve cover provided by an embodiment of the present disclosure.

[0027] Reference signs:

[0028] 1: valve seat; 2: valve cover; 3: diaphragm disc; 4: adjusting disc; 5: flag pole; 6: spring; 7: valve cover; 8: micro switch; 9: plug rubber; 10: rain cap; 11: lock cap; 12: first rubber ring; 13: second rubber ring. DETAILED DESCRIPTION

[0029] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to show.

[0030] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0031] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0032] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0033] Unless otherwise specified, the term "a plurality of" means two or more.

[0034] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the preceding and following objects. For example, A / B means: A or B.

[0035] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0036] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0037] In combination with Figures 1 to 5As shown, the oil-immersed transformer pressure release valve provided by the embodiment of the present disclosure is applied to a transformer and comprises a valve seat 1, a valve cover 2, a diaphragm disc 3, an adjusting disc 4, a marker rod 5, a spring 6, a valve cover 7 and a micro switch 8. The valve seat 1 is used to be connected with a tank or a raised seat of the transformer. The valve cover 2 is installed on the outer wall of the valve seat 1, and the valve cover 2 is detachably installed between the valve seat 1. The valve cover 2 comprises a pressure relief hole on the side wall thereof, and the pressure relief hole is used to release pressure. The diaphragm disc 3 is located inside the valve cover 2 and covers the top end of the valve seat 1, and is used to seal the top end of the valve seat 1. The adjusting disc 4 is installed on the inner wall of the valve cover 2, and the adjusting disc 4 comprises a first through hole and a second through hole. The first through hole is located at the center of the adjusting disc 4 and is used to pass through the marker rod 5. The second through holes are uniformly distributed around the first through hole and are all used to release pressure. The marker rod 5 is slidably arranged in the first through hole, and the bottom end of the marker rod 5 is connected with the diaphragm disc 3. The marker rod 5 moves synchronously with the diaphragm disc 3 and can slide relative to the adjusting disc 4. The spring 6 is sleeved on the marker rod 5 and is located between the diaphragm disc 3 and the adjusting disc 4, and is used to provide elastic force to make the diaphragm disc 3 seal the bottom end of the valve seat 1. The valve cover 7 is sleeved on the top end of the marker rod 5 and surrounds the top end of the valve cover 2, and is used to seal the top end of the valve cover 2. The micro switch 8 is installed on the inner wall of the valve cover 7, and the detection end of the micro switch 8 faces the marker rod 5 and is used to detect the position of the marker rod 5. The adjusting disc 4 comprises a first external thread on the outer wall thereof, the valve cover 2 comprises a first internal thread on the inner wall thereof, the first internal thread is matched with the first external thread, and the adjusting disc 4 is installed on the valve cover 2 through the first external thread and the first internal thread.

[0038] The oil-immersed transformer pressure release valve provided by the embodiment of the present disclosure can be used as follows. When the internal pressure of the transformer abnormally rises and reaches a preset threshold value, the pressure received by the diaphragm disc 3 can overcome the elastic force of the spring 6 and move. At this time, the high-pressure gas can be released to the atmosphere through the second through holes and the pressure relief hole, so as to complete the pressure relief operation. At the same time, the marker rod 5 slides relative to the adjusting disc 4 under the driving of the diaphragm disc 3, and then triggers the micro switch 8. After the micro switch 8 is triggered, the circuit state is switched immediately, and an explicit alarm signal is sent to the external monitoring system through the terminal post. Moreover, since the adjusting disc 4 is installed on the valve cover 2 through the first external thread and the first internal thread, the position of the adjusting disc 4 relative to the valve cover 2 can be changed by screwing the adjusting disc 4, so as to change the compression amount of the spring 6. When the production sizes of the valve seat 1 and the valve cover 2 deviate, the elastic force of the spring 6 to the diaphragm disc 3 can be kept constant by changing the position of the adjusting disc 4, so as to ensure the action consistency of the pressure release valve.

[0039] Optionally, as shown in Figure 1 , Figure 4 and Figure 5 , the valve seat 1 comprises a second external thread on the outer wall thereof. The valve cover 2 comprises a second internal thread on the inner wall thereof, and the second internal thread is matched with the second external thread. The valve cover 2 is installed on the valve seat 1 through the second internal thread and the second external thread.

[0040] In the embodiment of the present disclosure, the valve cover 2 is installed on the valve seat 1 through the second inner thread and the second outer thread. The valve cover 2 and the valve seat 1 are connected in a threaded manner, which has the advantages of stable connection and easy disassembly.

[0041] Optionally, in combination with Figure 1 as shown, a rubber plug 9 is further included. The rubber plug 9 is filled between the gap between the top end of the marker rod 5 and the top end of the valve cover 7.

[0042] In the embodiment of the present disclosure, the rubber plug 9 is further included and filled between the gap between the top end of the marker rod 5 and the top end of the valve cover 7. The rubber plug 9 is used for sealing to improve the sealing of the top end of the marker rod 5 and the top end of the valve cover 7.

[0043] Optionally, in combination with Figure 1 as shown, a rainproof cap 10 is further included. The rainproof cap 10 is installed on the top surface of the marker rod 5 and surrounds the top end of the valve cover 7.

[0044] In the embodiment of the present disclosure, the rainproof cap 10 is further included and installed on the top surface of the marker rod 5 and surrounds the top end of the valve cover 7. The rainproof cap is used for rainproof to avoid rainwater entering between the gap between the top end of the marker rod 5 and the top end of the valve cover 7.

[0045] Optionally, in combination with Figures 1 to 5 as shown, a lock cap 11 is further included. The lock cap 11 is installed on the outer wall of the valve cover 7 and surrounds the rainproof cap 10.

[0046] In the embodiment of the present disclosure, the lock cap 11 is further included and installed on the outer wall of the valve cover 7 and surrounds the rainproof cap 10. Before the device moves, the lock cap 11 needs to be disassembled to avoid limiting the marker rod 5.

[0047] Optionally, in combination with Figure 1 as shown, the valve cover 7 includes a third outer thread on the outer wall thereof. The lock cap 11 includes a third inner thread on the inner wall thereof, which matches the third outer thread. The lock cap 11 is installed on the valve cover 7 through the third inner thread and the third outer thread.

[0048] In the embodiment of the present disclosure, the lock cap 11 is installed on the valve cover 7 through the third inner thread and the third outer thread. The lock cap 11 is connected in a threaded manner, which has the advantages of stable connection and easy disassembly.

[0049] Optionally, in combination with Figure 1 as shown, a first rubber ring 12 is further included. The first rubber ring 12 is installed between the valve seat 1 and the diaphragm 3.

[0050] In the embodiment of the present disclosure, the first rubber ring 12 is further included and installed between the valve seat 1 and the diaphragm 3. The first rubber ring 12 is used to improve the sealing between the valve seat 1 and the diaphragm, and to avoid leakage before the pressure reaches the preset threshold.

[0051] Optionally, in combination with Figure 1 As shown in the drawings, the film disc 3 comprises an inorganic layer. The inorganic layer is located at the contact surface of the film disc 3 and the first rubber ring 12.

[0052] In the embodiments of the present disclosure, the film disc 3 comprises an inorganic layer. The inorganic layer is used for the contact of the film disc 3 and plays the role of anti-adhesion. It can effectively prevent the adhesion problem of the film disc 3 and the first rubber ring 12 due to long-time close contact, and further ensure that it can still maintain stable action pressure in the case of long-term inaction, thereby improving the reliability and safety of the entire transformer.

[0053] Optionally, in combination with Figure 1 , Figure 2 and Figure 4 As shown in the drawings, the second rubber ring 13 is further included. The second rubber ring 13 is respectively installed between the valve seat 1 and the transformer and the valve cover 2.

[0054] In the embodiments of the present disclosure, the second rubber ring 13 is further included and is respectively installed between the valve seat 1 and the transformer and the valve cover 2. The second rubber ring 13 is used to improve the sealing between the valve seat 1 and the transformer and between the valve seat 1 and the valve cover 2.

[0055] The above description and drawings sufficiently show the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments are merely representative of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Parts and features of some embodiments can be included or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A pressure relief valve for an oil-immersed transformer, applied to a transformer, characterized in that, include: Valve seat, used to connect to the transformer housing or riser; A valve cover is installed on the outer wall of the valve seat; A diaphragm disc is located inside the valve cover and covers the top of the valve seat; An adjusting disc is installed on the inner wall of the valve cover. The adjusting disc includes a first through hole and a second through hole. The first through hole is located at the center of the adjusting disc, and the second through hole is evenly distributed around the first through hole. A marker rod is slidably inserted through the first through hole, and the bottom end of the marker rod is connected to the diaphragm plate; A spring is sleeved on the marker rod and located between the diaphragm disk and the adjustment disk; A valve cover is installed on the top of the valve cover and sleeved on the top of the marker rod; A micro switch is installed on the inner wall of the valve cover, with the detection end of the micro switch facing the indicator rod; The adjusting disc includes a first external thread on its outer wall, and the valve cover includes a first internal thread on its inner wall. The first internal thread matches the first external thread, and the adjusting disc is installed on the valve cover via the first external thread and the first internal thread.

2. The pressure relief valve for an oil-immersed transformer according to claim 1, characterized in that: The valve seat includes a second external thread located on its outer wall; The valve cover includes a second internal thread located on its inner wall, the second internal thread being matched with the second external thread; The valve cover is mounted on the valve seat via the second internal thread and the second external thread.

3. The pressure relief valve for an oil-immersed transformer according to claim 1, characterized in that, Also includes: The sealant is applied to fill the gap between the top of the marker rod and the top of the valve cover.

4. A pressure relief valve for an oil-immersed transformer according to claim 3, characterized in that, Also includes: A rain cap is installed on the top surface of the signpost and surrounds the top of the valve cover.

5. A pressure relief valve for an oil-immersed transformer according to claim 4, characterized in that, Also includes: A locking cap is installed on the outer wall of the valve cover and surrounds the rain cap.

6. A pressure relief valve for an oil-immersed transformer according to claim 5, characterized in that: The valve cover includes a third external thread located on its outer wall; The lock cap includes a third internal thread located on its inner wall, the third internal thread mating with the third external thread; The locking cap is installed on the valve cover via the third internal thread and the third external thread.

7. A pressure relief valve for an oil-immersed transformer according to any one of claims 1 to 6, characterized in that, Also includes: The first rubber ring is installed between the valve seat and the diaphragm.

8. A pressure relief valve for an oil-immersed transformer according to claim 7, characterized in that: The membrane disk includes an inorganic layer located at the contact surface between the membrane disk and the first rubber ring.

9. A pressure relief valve for an oil-immersed transformer according to any one of claims 1 to 6, characterized in that, Also includes: The second rubber ring is installed between the valve seat and the transformer and the valve cover, respectively.

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