Leakage-proof oil-gas isolation device

Abstract

The utility model relates to an anti-leakage oil-gas isolation device which comprises a flow regulating valve, a connecting sleeve, a one-way valve seat, a one-way valve sleeve and a threaded connector which are sequentially connected. The flow regulator comprises a porous bushing, a valve rod arranged in the porous bushing and a one-way valve spring arranged between the porous bushing and the valve rod, a conical air inlet is formed in the one-way valve seat, and one end of the valve rod is provided with a conical plug capable of being inserted into the conical air inlet and plugging the conical air inlet. According to the leakproof oil-gas isolation device, an original plane sealing structure is changed into a conical sealing structure, and after the leakproof oil-gas isolation device is used for a long time, even if the sealing ring is deformed or abraded to a certain degree, sealing failure cannot occur, so that the safety and the effectiveness of the nitrogen release valve during use are guaranteed, and the service life of the nitrogen release valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an oil and gas isolation device for preventing leakage in a transformer. Background Art

[0002] The nitrogen release valve is a switching valve body installed between a nitrogen storage tank and a nitrogen input end. Most of the nitrogen release valves in the prior art are one-way valve bodies. Under the conditions of the prior art, when nitrogen is input into the pipeline structure of a transformer, a nitrogen flow regulating valve needs to be installed, and an oil and gas isolation valve body will be arranged between the nitrogen flow regulating valve and the input end of the transformer. For example, an automatic pressure relief and anti-mis-leakage type oil and gas isolation device (CN105805380B) applied by the applicant can receive and block the accidentally leaked and dripped oil droplets. However, after being used for a long time, the sealing structure at the flow regulator is very easy to fail and oil leakage occurs, affecting the use of the release valve. Summary of the Utility Model

[0003] Aiming at the deficiencies in the prior art, the utility model provides an oil and gas isolation device for preventing leakage, which has a simple structure, is easy to install, and has a good sealing effect.

[0004] The utility model is realized by the following technical solutions:

[0005] An oil and gas isolation device for preventing leakage includes a flow regulating valve, a connecting sleeve, a one-way valve seat, a one-way valve sleeve and a threaded joint connected in sequence. A flow regulator is arranged in the one-way valve sleeve. The flow regulator includes a porous bushing, a valve stem arranged in the porous bushing, and a one-way valve spring arranged between the porous bushing and the valve stem. A conical air inlet is formed on the one-way valve seat, and one end of the valve stem has a conical plug that can be inserted into the conical air inlet and block it.

[0006] In order to further ensure the sealing performance, an O-ring seal is sleeved on the outer wall of the conical plug, and the O-ring seal is in interference fit with the inner wall of the conical air inlet.

[0007] In order to facilitate the installation of the seal ring, an annular groove for the O-ring seal to be embedded is formed on the outer wall of the conical plug, and a part of the O-ring seal protrudes out of the annular groove.

[0008] Preferably, the taper of the conical air inlet or the conical plug is 60 degrees.

[0009] The beneficial effect of the utility model is that the original planar sealing structure of the oil and gas isolation device for preventing leakage is changed to a conical sealing structure. After being used for a long time, even if the seal ring is deformed or worn to a certain extent, the sealing failure will not occur, thus ensuring the safety and effectiveness of the nitrogen release valve during use and improving its service life. Brief Description of the Drawings

[0010] Figure 1 is a schematic structural view of the anti-leakage oil-gas isolation device of the present utility model;

[0011] Figure 2 is a schematic structural view of the check valve sleeve and the valve stem of the present utility model. Detailed implementation manners

[0012] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. The directional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for explaining and understanding the present utility model, rather than for limiting the present utility model.

[0013] As Figure 1 shown, an anti-leakage oil-gas isolation device includes a flow regulating valve 1, a connecting sleeve 2, a check valve seat 4, a check valve sleeve 5 and a threaded joint 7 which are connected in sequence. Among them, the connecting sleeve 2 and the check valve seat 4 are detachably connected through a threaded connecting sleeve 3, and the check valve sleeve 5 and the threaded joint 7 are detachably connected through a threaded connecting sleeve 6. A flow regulator is arranged in the check valve sleeve 5.

[0014] Specifically, as Figure 2 shown, the flow regulator includes a porous bushing 10, a valve stem 8 arranged in the porous bushing 10, and a check valve spring 11 arranged between the porous bushing 10 and the valve stem 8. A conical air inlet 401 is opened at the top end of the check valve seat 4. The bottom end of the valve stem 8 has a conical plug 801 that can be inserted into the conical air inlet 401 and block it. An annular groove 802 is opened on the outer wall of the conical plug 801. An O-ring 9 is sleeved in the annular groove 802. A part of the O-ring 9 protrudes outside the annular groove 802. The O-ring 9 is in interference fit with the inner wall of the conical air inlet 401. The taper α of the conical air inlet 401 and the taper β of the conical plug 801 are both preferably 60 degrees.

[0015] The anti-leakage oil-gas isolation device changes the original planar sealing structure to a conical sealing structure. After being used for a long time, even if the O-ring deforms or wears to a certain extent, due to the action of the check valve spring 11, the conical air inlet and the conical plug can always be tightly fitted, thereby avoiding sealing failure.

[0016] In addition, in the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "setting", "provided with", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. An anti-leakage oil and gas isolation device, comprising a flow regulating valve, a connecting sleeve, a check valve seat, a check valve sleeve and a threaded joint connected in sequence. A flow regulator is arranged in the check valve sleeve. The flow regulator includes a porous bushing, a valve stem arranged in the porous bushing, and a check valve spring arranged between the porous bushing and the valve stem. It is characterized in that: The one-way valve seat is provided with a conical air inlet, and one end of the valve stem has a conical plug that can be inserted into the conical air inlet and block it.

2. The anti-leakage oil and gas isolation device according to claim 1, characterized in that: An O-ring seal is sleeved on the outer wall of the conical plug, and the O-ring seal is in interference fit with the inner wall of the conical air inlet.

3. The anti-leakage oil and gas isolation device according to claim 2, characterized in that: A ring-shaped groove for the O-ring seal to be embedded is formed on the outer wall of the conical plug, and a part of the O-ring seal is exposed outside the ring-shaped groove.

4. The anti-leakage oil and gas isolation device according to claim 1, characterized in that: The taper of the conical air inlet or the conical plug is 60 degrees.

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