Novel valve rod sealing structure

Abstract

The utility model relates to the field of valve sealing, and discloses a novel valve rod sealing structure which comprises a lower valve body, an upper valve body is installed on the upper surface of the lower valve body, a valve rod is connected to the inner wall of the upper valve body in a threaded mode, an upper sealing assembly is arranged on the inner wall of the upper valve body, and the upper sealing assembly comprises a sealing ring. The outer wall of the valve rod is sleeved with the sealing ring, the upper end and the lower end of the sealing ring are in a frustum shape, the upper surface of the upper valve body is in threaded connection with a pressing cap, an upper inclined groove is formed in the lower surface of the pressing cap, a lower inclined groove is formed in the inner wall of the upper valve body, and a middle sealing assembly is arranged on the outer wall of the valve rod. A lower sealing assembly is arranged at the lower end of the valve rod. According to the sealing structure, the upper end and the lower end of the sealing ring are both in the frustum shape, when the pressing cap is installed, the pressing cap can extrude the upper end of the sealing ring through the upper inclined groove, and therefore the upper portion of the sealing ring can deform inwards to be attached to the valve rod, and meanwhile the sealing ring can move downwards.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve sealing field especially relates to a novel valve rod sealing structure. BACKGROUND

[0002] The valve rod is a component for connecting the valve driving device and the valve core, usually located on the central axis of the valve, penetrating the upper and lower parts of the valve, and the interior needs to be guaranteed high sealing when the valve is in use, so a sealing assembly needs to be arranged at the connection between the valve rod and the valve body for sealing.

[0003] In the prior art, multiple 0-type rings or multiple gaskets are often used for compression, however, the deformation direction of the 0-type ring and the gasket is uncontrollable when being compressed, so that the adjacent two groups of 0-type rings or gaskets cannot stably form a tight connection, and the 0-type ring or the gasket cannot form a stable seal with the valve rod, and the overall structure has low sealing reliability, therefore, a novel valve rod sealing structure is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0004] In order to make up for the above shortcomings, the utility model provides a novel valve rod sealing structure, aiming at improving the problem of "using 0-type ring or gasket to realize sealing, and low sealing reliability" in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a novel valve rod sealing structure, comprising a lower valve body, the upper surface of the lower valve body is provided with an upper valve body, the inner wall of the upper valve body is provided with a valve rod through threaded connection, the inner wall of the upper valve body is provided with an upper sealing assembly, the upper sealing assembly comprises a sealing ring, the sealing ring is sleeved on the outer wall of the valve rod, the upper and lower ends of the sealing ring are both set as conical frustums, the upper surface of the upper valve body is provided with a compression cap through threaded connection, the lower surface of the compression cap is provided with an upper inclined groove, the inner wall of the upper valve body is provided with a lower inclined groove, the outer wall of the valve rod is provided with a middle sealing assembly, and the lower end of the valve rod is provided with a lower sealing assembly.

[0006] As a further description of the above technical scheme:

[0007] The lower sealing assembly comprises an extrusion block, the extrusion block is sleeved on the bottom end of the valve rod, and the lower end of the extrusion block is fixedly connected with a lower sealing block.

[0008] As a further description of the above technical scheme:

[0009] The inner wall of the lower valve body is provided with a lower sealing groove near the lower side of the valve rod, and the lower sealing block is inserted into the inner wall of the lower sealing groove.

[0010] As a further description of the above technical scheme:

[0011] The lower sealing block is integrally arranged in a frustum shape and the cross section thereof is gradually reduced from top to bottom, and the lower sealing groove is arranged in a frustum shape.

[0012] As a further description of the above technical solution:

[0013] The outer wall of the lower sealing block is provided with a circular arc groove.

[0014] As a further description of the above technical solution:

[0015] The middle sealing assembly comprises an air-tight pad, the air-tight pad is fixedly connected to the outer wall of the valve rod, and the lower surface of the upper valve body is provided with an air-tight groove matched with the air-tight pad.

[0016] As a further description of the above technical solution:

[0017] The upper surface of the air-tight pad is arranged in a frustum shape.

[0018] The utility model has the advantages of the following beneficial effects:

[0019] 1、 the utility model discloses, through setting up the upper and lower ends of the sealing ring as frustum shape, when installing the pressure cap, the pressure cap will extrude the upper end of the sealing ring through the upper inclined groove, so that the upper part of the sealing ring can be deformed inward and fit the valve rod, and the sealing ring will move downward at the same time, the lower end of the sealing ring will be extruded by the lower inclined groove, so that the lower part of the sealing ring can be deformed inward, so that a group of sealing rings can realize twice sealing, and the stable inward deformation of the sealing ring can be guaranteed, and the sealing effect is better in use.

[0020] 2、 the utility model discloses, through setting up the middle sealing assembly, when the overall device is in the communication state, the air-tight pad will be inserted into the air-tight groove, so that internal sealing can be realized once, when the device is internally communicated, the air-tight pad can be used to limit air to prevent air from escaping from the place, the sealing effect of the device can be further improved, and when the sealing ring is replaced, the pipeline connected to the two ends of the valve does not need to be closed, the inside of the lower valve body can be sealed by the air-tight pad, which is convenient for maintenance.

[0021] 3、 the utility model discloses, through setting up the lower sealing block as a frustum shape, the lower sealing block can better fit the lower sealing groove when being extruded, and a plurality of circular arc grooves are arranged outside the lower sealing block, if there are foreign matters in the lower sealing groove, the foreign matters can be temporarily stored in the circular arc grooves when the overall device is closed, so that the damage of the foreign matters to the lower sealing block can be reduced, and the durability of the lower sealing block can be improved. DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall device in the utility model;

[0023] Figure 2It is the three-dimensional structure section view schematic diagram of the whole device in the utility model.

[0024] Figure 3 It is the three-dimensional structure section view split schematic diagram of the upper sealing assembly in the utility model.

[0025] Figure 4 It is the three-dimensional structure section view split schematic diagram of the lower sealing assembly in the utility model.

[0026] Figure 5 It is the three-dimensional structure schematic diagram of embodiment two in the utility model.

[0027] Legend:

[0028] 1, lower valve body;2, upper valve body;3, valve stem;4, upper sealing assembly;41, pressing cap;42, sealing ring;43, sealing pad;44, upper inclined chute;45, lower inclined chute;5, lower sealing assembly;51, extrusion block;52, lower sealing block;53, circular arc groove;54, lower sealing groove;6, middle sealing assembly;61, air-tight pad;62, air-tight groove. Specific implementation

[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] Embodiment one:

[0031] Reference Figure 1 - Figure 3The utility model provides a kind of embodiment: a kind of novel valve stem sealing structure, including the lower valve body 1 for fluid to pass, the upper surface of lower valve body 1 is equipped with the upper valve body 2 for supporting valve stem 3, the inner wall of upper valve body 2 is threadedly connected with valve stem 3 for controlling overall device switch, the inner wall of upper valve body 2 is provided with upper sealing assembly 4 for the sealing of the outer wall of valve stem 3, upper sealing assembly 4 includes the sealing ring 42 for wrapping valve stem 3, sealing ring 42 is sleeved in the outer wall of valve stem 3, when not installing pressure cap 41, valve stem 3 can pass from the inside of sealing ring 42, the upper and lower ends of sealing ring 42 are all set as conical frustum, when the upper and lower ends of sealing ring 42 are extruded, sealing ring 42 will be deformed tightly and wrap valve stem 3, the upper surface of upper valve body 2 is threadedly connected with the pressure cap 41 for extruding sealing ring 42, the lower surface of pressure cap 41 is provided with upper inclined groove 44, the inner wall of upper valve body 2 is provided with lower inclined groove 45, by setting upper inclined groove 44 and lower inclined groove 45, can make pressure cap 41 and upper valve body 2 better adhere to the upper and lower ends of sealing ring 42, the outer wall of valve stem 3 is provided with middle sealing assembly 6 for realizing sealing after device is opened, the lower end of valve stem 3 is provided with lower sealing assembly 5 for plugging the internal passage of device.

[0032] Refer to Figure 2 - Figure 4 , lower sealing assembly 5 includes extrusion block 51 for extruding lower sealing block 52, extrusion block 51 is sleeved in the bottom end of valve stem 3, the lower end of extrusion block 51 is fixedly connected with lower sealing block 52, when valve stem 3 moves downward, it will extrude lower sealing block 52 by extrusion block 51, the inner wall of lower valve body 1 is close to the lower of valve stem 3 and is provided with lower sealing groove 54 for containing lower sealing block 52, lower sealing block 52 is inserted in the inner wall of lower sealing groove 54, lower sealing block 52 is integrally provided as conical frustum and cross section gradually reduces from top to bottom, lower sealing groove 54 is provided as conical frustum, by being provided as conical frustum for lower sealing block 52 and lower sealing groove 54, can make them better adhere when extruding, the outer wall of lower sealing block 52 is provided with arc groove 53 for containing foreign matter, simultaneously arc groove 53 can divide the outer wall of lower sealing block 52 into three layers, so a sealing block 52 can realize three-layer closure.

[0033] Refer to Figure 2 - Figure 4 , middle sealing assembly 6 includes air-tight pad 61 for realizing sealing from inside, air-tight pad 61 is fixedly connected in the outer wall of valve stem 3, the lower surface of upper valve body 2 is provided with air-tight groove 62 matched with air-tight pad 61, when device is in the open state, air-tight pad 61 will move upward and insert in the inside of air-tight groove 62 under the drive of valve stem 3, so it can prevent device internal pressure loss, the upper surface of air-tight pad 61 is provided as conical frustum.

[0034] Embodiment two:

[0035] Refer toFigure 1 、 Figure 3 and Figure 5 The utility model discloses, the difference between embodiment two and embodiment one lies in, the lower part of the sealing ring 42 of embodiment two is sleeved with multiple sets of sealing pads 43, and the upper surface of sealing pad 43 is also provided with lower chute 45, so setting, when sealing ring 42 moves down, it will be limited by the lower chute 45 above sealing pad 43, and when sealing pad 43 moves down, another set of sealing pad 43 below it is also extruded to make it deform inwardly and fit the outer wall of valve stem 3 through lower chute 45, so setting can realize multilayer sealing, can further improve sealing effect, can be applicable to the device inside of higher sealing degree requirement.

[0036] Working principle: when the device is in the closed state, sealing ring 42 is extruded by pressure cap 41, and the upper end of sealing ring 42 is extruded to deform inwardly and fit the outer wall of valve stem 3, and sealing ring 42 is forced to displace downward, and sealing ring 42 is limited to deform inwardly and fit the outer wall of valve stem 3 when moving down, so that two times of sealing can be realized through a set of sealing ring 42, and lower sealing block 52 can move down and insert into the inside of lower sealing groove 54 under the extrusion of extrusion block 51, so that the internal passage of upper valve body 2 can be locked.

[0037] When the whole device needs to be connected, valve stem 3 can be rotated to drive valve stem 3 to move up, and valve stem 3 moves up to drive air-tight pad 61 to move up and insert into air-tight groove 62, so that the upper end opening of lower valve body 1 can be closed from the inside, the pressure leakage in lower valve body 1 can be prevented, and the internal pressure of the whole device can be stabilized.

[0038] Finally, it should be noted that: the above-mentioned only for the preferred embodiment of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A new valve stem seal structure comprising a lower valve body (1) characterized by: The upper surface of the lower valve body (1) is provided with an upper valve body (2), the inner wall of the upper valve body (2) is provided with a valve rod (3) in a threaded connection, the inner wall of the upper valve body (2) is provided with an upper sealing assembly (4), the upper sealing assembly (4) comprises a sealing ring (42), the sealing ring (42) is sleeved on the outer wall of the valve rod (3), the upper and lower ends of the sealing ring (42) are provided in a conical frustum shape, the upper surface of the upper valve body (2) is provided with a pressure cap (41) in a threaded connection, the lower surface of the pressure cap (41) is provided with an upper inclined groove (44), the inner wall of the upper valve body (2) is provided with a lower inclined groove (45), the outer wall of the valve rod (3) is provided with a middle sealing assembly (6), and the lower end of the valve rod (3) is provided with a lower sealing assembly (5).

2. A new valve stem seal structure according to claim 1, characterized in that: The lower sealing assembly (5) comprises an extrusion block (51), the extrusion block (51) is sleeved on the bottom end of the valve rod (3), and the lower end of the extrusion block (51) is fixedly connected with a lower sealing block (52).

3. A new valve stem seal structure according to claim 2, characterized in that: The inner wall of the lower valve body (1) is provided with a lower sealing groove (54) below the valve rod (3), and the lower sealing block (52) is inserted into the inner wall of the lower sealing groove (54).

4. A new valve stem seal structure according to claim 3, characterized in that: The lower sealing block (52) is provided in a conical frustum shape as a whole and the cross section thereof is gradually reduced from top to bottom, and the lower sealing groove (54) is provided in a conical frustum shape.

5. A new valve stem seal structure according to claim 2, characterized in that: The outer wall of the lower sealing block (52) is provided with a circular arc groove (53).

6. A new valve stem seal structure according to claim 1, characterized in that: The middle sealing assembly (6) comprises an air-tight pad (61), the air-tight pad (61) is fixedly connected to the outer wall of the valve rod (3), and the lower surface of the upper valve body (2) is provided with an air-tight groove (62) matched with the air-tight pad (61).

7. A new valve stem seal structure according to claim 6, characterized in that: The upper surface of the air-tight pad (61) is provided in a conical frustum shape.

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