CN112112995A - Oil seal type plug valve - Google Patents

Abstract

The invention discloses an oil-sealed plug valve, comprising a valve body, a plug, a valve stem, a bottom cover, an adjusting screw, an oil injection valve, a packing pad, a packing, a packing hole, a triangular pad, a diaphragm pad, a gland, an adjusting bolt, Bonnets, bolts, top blocks, graphite and gaskets. The structure of the invention is reasonable, the tightness of the valve cover seal and the packing seal is adjusted by adjusting the downward force of the bolt, the double sealing structure ensures that the sealing grease does not leak from the valve cover, and the sealing performance of the valve is ensured. There is a diaphragm pad above the graphite, the diaphragm pad is provided with a top block, and an adjustment hole is arranged on the bottom cover, and the tightness of the lower seal can be adjusted through the adjustment screw, so the double adjustment structure design is adopted, and the valve cavity is adjusted according to the needs. The internal tightness of the body reduces torque, balances the internal pressure of the cavity, oil seals the gap at the joint, and at the same time achieves the effect of lubrication, which is convenient for rotating the valve stem and avoids rust.

Description

An oil-sealed plug valve

technical field

The invention relates to a plug valve, in particular to an oil-sealed plug valve.

Background technique

The valve is a pressure pipeline component, which is a device used to change the pipeline section and the flow direction of the medium, and to control the pressure, flow, and temperature of the conveyed medium. It is widely used in various major fields of the national economy. In recent years, China's valve industry has developed more and more rapidly, product exports and market share have become larger and larger, and it has become the main production base and main sales market of the valve industry. As one of the common valves in industrial and civil engineering, the valve is widely used in various industries such as petrochemical and other industries because of its simple structure and rapid switching.

The long-term use of the plug valve will cause leakage due to the reduced sealing between the valve body and the valve stem, and at the same time, it will also accelerate the corrosion and corrosion of the corresponding parts, and the tightness of the internal structure cannot be adjusted. balance the pressure inside the cavity. Therefore, an oil-sealed plug valve is proposed to solve the above problems.

SUMMARY OF THE INVENTION

An oil-sealed plug valve comprises a valve body, a plug is arranged inside the valve body, a valve rod is arranged on the plug, a driving actuator is installed at the bottom end of the valve rod, and an annular surface of the plug is located inside the valve body. A plurality of oil sealing grooves are arranged at equal distances up and down in part, and the plurality of oil sealing grooves are communicated with each other, and one of the oil sealing grooves is communicated with the surface of the valve body through an oil filling hole, and a port on the outer side of the oil filling hole is installed. Oil filling valve.

Further, the valve cover is located on the valve body, the inside of the valve cover is provided with a gland, a diaphragm pad is arranged under the gland, a triangular pad is arranged under the membrane pad, the gland and the diaphragm The gasket and triangular gasket form a seal against the valve cover.

Further, the adjusting bolt passes through the valve cover and contacts the gland.

Further, the packing is located in the annular space structure formed by the packing pad and the corresponding part of the cock at the corresponding part of the valve body, and the formed annular space structure is communicated with the outside of the valve body through the packing hole.

Further, the bottom cover is located at the bottom of the valve body, and the inner middle part of the bottom cover is connected to the corresponding end of the cock, and the bottom cover is provided with a slope adjustment hole structure.

Further, the bottom cover and the valve cover are connected to each other at corresponding upper and lower positions of the valve body through bolts.

Further, a lower sealing structure is arranged inside the bottom cover, and the lower sealing structure includes a gasket, graphite is arranged on the gasket, a diaphragm gasket is arranged above the graphite, and a top block is arranged on the diaphragm gasket.

Further, the annular groove of the oil sealing groove and the inner ring wall of the annular column hole structure inside the valve body are in sliding sealing contact with each other, and the oil sealing grooves are communicated with each other through fine pores.

Further, an elastic pressing piece is installed on one end face of the adjusting bolt, and the elastic pressing piece and the edge of the top cover surface of the gland are pressed together.

Further, the filler enters into the annular space structure formed by the filler pad and the corresponding part of the cock in the valve body through the filler hole.

The beneficial effects of the present invention are as follows: the present invention provides an oil-sealed plug valve with a double-sealing structure and a double-adjusting structure.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a front view of the overall structure of an embodiment of the present invention;

2 is a rear view of the overall structure of an embodiment of the present invention;

3 is a partial enlarged view of part A of an embodiment of the present invention;

4 is a partial enlarged view of part B of an embodiment of the present invention;

5 is a schematic diagram of the overall structure of place A of an embodiment of the present invention;

FIG. 6 is a schematic diagram of a connection structure of a cock and a valve stem according to an embodiment of the present invention.

In the picture: 1. Valve body, 2. Plug, 201, Oil sealing groove, 202, Oil filling hole, 3. Valve stem, 4. Bottom cover, 5. Adjusting screw, 6. Oil filling valve, 7. Packing pad, 8. Packing, 9, Packing hole, 10, Triangular pad, 11, Diaphragm pad, 12, Gland, 13, Adjusting bolt, 14, Bonnet, 15, Bolt, 16, Top block, 17, Graphite, 18, Gasket.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "installed", "set up", "provided with", "connected", "connected", "socketed" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

1-6, an oil-sealed plug valve includes a valve body 1, a plug 2 is arranged inside the valve body 1, a valve stem 3 is arranged on the plug 2, and the valve stem 3 is at the bottom A driving actuator 5 is installed at the end of the valve body 1, and a plurality of oil sealing grooves 201 are provided on the annular surface of the cock 2 inside the valve body 1 at equal distances up and down. The sealing groove 201 communicates with the surface of the valve body 1 through an oil injection hole 202 , and an oil injection valve 6 is installed on the outer port of the oil injection hole 202 .

The valve cover 14 is located on the valve body 1, the valve cover 14 is provided with a pressure cover 12 inside, a diaphragm pad 11 is arranged below the pressure cover 12, and a triangular pad 10 is arranged below the diaphragm pad 11, so The gland 12, the diaphragm gasket 11 and the triangular gasket 10 form a sealing structure on the valve cover 14;

The adjusting bolt 13 passes through the valve cover 14 and contacts with the gland 12; the packing 8 is located in the annular space structure formed by the packing pad 7 and the corresponding part of the cock 2 in the corresponding part of the valve body 1, and the formed annular space structure passes through. The packing hole 9 is communicated with the outside of the valve body 1; the bottom cover 4 is located at the bottom of the valve body 1, and the inner middle part of the bottom cover 4 is connected with the corresponding end of the cock 2, and the bottom cover 4 is provided with a slope adjustment hole structure; The bottom cover 4 and the valve cover 14 are connected to each other at the upper and lower corresponding positions of the valve body 1 through bolts 15; the bottom cover 4 is provided with a lower sealing structure, and the lower sealing structure includes a gasket 18. The gasket 18 There is graphite 17 on it, a diaphragm pad 11 is arranged above the graphite 17, and a top block 16 is arranged on the diaphragm pad 11; Sliding and sealing contact, and the oil sealing grooves 201 are communicated with each other through fine holes; one end face of the adjusting bolt 13 is installed with an elastic pressure piece, and the elastic pressure piece and the edge of the top cover surface of the gland 12 are pressed together; the packing 8 Enter into the annular space structure formed by the packing pad 7 and the corresponding position of the cock 2 in the valve body 1 through the packing hole 9 .

When the present invention is in use, an adjusting bolt 13 is arranged above the valve cover 14, and the adjusting bolt 13 passes through the valve cover 14 to connect with the gland 12. During operation, the downward force of the adjusting bolt 13 is used to adjust the valve cover as required. The tightness of the 14 seal and the packing 8 seal, the double seal structure ensures that the sealing grease does not leak from the valve cover, and ensures the sealing performance of the valve; the bottom cover 1 is provided with a lower seal, and the gasket 18 is provided with graphite 17, graphite 17 A diaphragm pad 11 is provided above, a top block 16 is provided on the diaphragm pad, an adjustment hole is provided on the bottom cover 4, and the tightness of the lower seal can be adjusted by adjusting screws 5. There are two interconnected oil sealing grooves 201, and grease is injected into the annular space formed by the oil sealing groove 201 and the ring wall of the inner column hole structure of the valve body 1 through the oil filling valve 6 installed on the oil filling hole 202, so that the gap at the connection can be oil-sealed. , at the same time to achieve the effect of lubrication, easy to rotate the valve stem 3, to avoid corrosion.

The benefits of the present invention are:

1. The structure of the present invention is reasonable. By adjusting the downward force of the bolt 13, the tightness of the seal of the valve cover 14 and the seal of the packing 8 is adjusted, and the double-sealing structure ensures that the sealing grease does not leak from the valve cover and ensures the sealing performance of the valve;

2. The structure of the present invention is reasonable, the graphite 17 is provided through the gasket 18, the diaphragm pad 11 is provided above the graphite 17, the diaphragm pad is provided with a top block 16, and the bottom cover 4 is provided with an adjustment hole, through the adjustment screw 5 The tightness of the lower seal can be adjusted, so the double-adjustment structure design is adopted to adjust the tightness of the valve cavity according to the needs, reduce the torque, and balance the internal pressure of the cavity;

3. The structure of the present invention is reasonable. A plurality of interconnected oil sealing grooves 201 are provided on the annular surface of the cock 2, and grease is injected into the oil sealing groove 201 and the inner column hole of the valve body 1 through the oil filling valve 6 installed on the oil filling hole 202. In the annular space formed by the structural ring wall, the gap at the connection can be oil-sealed, and at the same time, the effect of lubrication can be achieved, which is convenient for rotating the valve stem 3 and avoids corrosion.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides an oil seal formula plug valve which characterized in that: including valve body (1), valve body (1) inside is provided with cock (2), cock (2) on be equipped with valve rod (3), valve rod (3) bottom install drive actuating mechanism (5), the equidistance is equipped with a plurality of oil seal grooves (201) about being located cock (2) ring surface part inside valve body (1), a plurality of intercommunication each other between oil seal groove (201), and one of them oil seal groove (201) are through oil filler point (202) and valve body (1) surface intercommunication, install oiling valve (6) on oil filler point (202) outside port.

2. The oil-sealed plug valve of claim 1, further comprising a valve cover (14), wherein the valve cover (14) is located on the valve body (1), a gland (12) is arranged inside the valve cover (14), a diaphragm gasket (11) is arranged below the gland (12), a triangular gasket (10) is arranged below the diaphragm gasket (11), and the gland (12), the diaphragm gasket (11) and the triangular gasket (10) form a sealing structure for the valve cover (14).

3. An oil-tight plug valve according to claim 1, further comprising an adjustment bolt (13), said adjustment bolt (13) passing through the valve cover (14) to contact the gland (12).

4. The oil seal type plug valve according to claim 1, further comprising a packing (8), wherein the packing (8) is positioned in an annular space structure formed by the packing pad (7) and a corresponding part of the plug (2) in the valve body (1), and the formed annular space structure is communicated with the outside of the valve body (1) through a packing hole (9).

5. An oil-tight plug valve according to claim 1, further comprising a bottom cover (4), wherein the bottom cover (4) is located at the bottom of the valve body (1), the middle part of the inner side of the bottom cover (4) is connected with the corresponding end of the plug (2), and the bottom cover (4) is provided with a slope adjusting hole structure.

6. An oil-tight plug valve according to claim 5, wherein: the bottom cover (4) and the valve cover (14) are connected with the valve body (1) at the corresponding positions up and down through bolts (15).

7. An oil-tight plug valve according to claim 5, wherein: the bottom cover (4) is internally provided with a lower sealing structure, the lower sealing structure comprises a gasket (18), graphite (17) is arranged on the gasket (18), a diaphragm pad (11) is arranged above the graphite (17), and the diaphragm pad is provided with a top block (16).

8. The oil-tight plug valve of claim 1, wherein: the annular notch of the oil seal groove (201) is in sliding sealing contact with the inner annular wall of the annular column hole structure in the valve body (1), and the oil seal grooves (201) are communicated with each other through a thin hole channel.

9. An oil-tight plug valve according to claim 3, wherein: and an elastic sheet is arranged on the end face of one end of the adjusting bolt (13), and the elastic sheet and the edge of the top cover face of the gland (12) are mutually attached and pressed together.

10. An oil-tight plug valve according to claim 4, wherein: and the packing (8) enters an annular space structure formed by the packing pad (7) and the corresponding part of the cock (2) in the valve body (1) through the packing hole (9).

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