Pressure balance structure for upper cavity and lower cavity of transmission part in ball valve

Abstract

The utility model relates to a pressure balance structure for an upper cavity and a lower cavity of a transmission part in a ball valve, which comprises a valve body, a valve core and a valve core, the top of the valve body is connected with the valve cover, and an upper cavity is formed in the valve body; the valve rod is movably arranged in the valve cover; the transmission part is fixed at the bottom of the valve rod and is arranged in the upper cavity in a sliding manner; the ball core is fixed to the bottom of the transmission piece and suitable for rotating along with the valve rod to be sealed with a valve seat in the valve body. A pressure circulation groove communicated with the upper cavity and the lower cavity is formed in the transmission part; a piston effect is formed among the upper cavity, the lower cavity and the transmission piece, a medium circulates from the lower cavity, when the ball valve is opened or closed, the high-pressure medium can act on the transmission piece upwards, part of the medium enters the upper cavity from the lower cavity through the pressure circulation groove, the upward pressure of the high-pressure medium on the transmission piece is greatly reduced, and the requirements of a support and an executing mechanism are lowered. And the valve rod or the actuating mechanism is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the field of track ball valves, in particular to a pressure balancing structure for upper and lower cavities of a transmission part in a ball valve. Background Art

[0002] When the valve cavity of a forced-seal ball valve is filled with high-pressure fluid, the up-and-down movement of the valve stem causes the high-pressure fluid to exert upward pressure on the maximum diameter of the valve stem, which can easily cause wear of the valve stem and other contacting parts. In severe cases, it can cause the actuator connection flange to break and the valve stem to "fly out". The conventional solution is to use a stronger welded bracket, which increases manufacturing costs.

[0003] In summary, how to reduce the impact of high-pressure media on the valve stem has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to reduce the impact of high-pressure medium on the valve stem;

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The utility model discloses a pressure balancing structure for the upper and lower chambers of a transmission member in a ball valve, comprising: a valve body, which has a lower chamber therein for facilitating the flow of a medium; a valve cover, to which the top of the valve body is connected, which has an upper chamber therein; a valve stem, which is movably arranged in the valve cover; a transmission member, which is fixed to the bottom of the valve stem and slidably arranged in the upper chamber; and a ball core, which is fixed to the bottom of the transmission member and is adapted to rotate with the valve stem and seal with a valve seat in the valve body; wherein the transmission member is provided with a pressure flow groove communicating with the upper and lower chambers;

[0007] In this solution, a spiral inner groove is provided on the top of the transmission part, a ball core is provided on the bottom, a positioning pin cooperating with the spiral inner groove is provided in the valve cover, the top of the valve stem is connected to the actuator, and the bottom of the valve stem is connected to the transmission part. The operation of the actuator drives the transmission part and the ball core to rotate up or down, sealing or separating the ball core from the valve seat; a piston effect is formed between the upper chamber, the lower chamber and the transmission part, and the medium flows from the lower chamber. When the ball valve is opened or closed, the high-pressure medium will act upward on the transmission part, and part of the medium enters the upper chamber from the lower chamber through the pressure flow groove, which greatly reduces the upward pressure of the high-pressure medium on the transmission part, reduces the requirements of the bracket and the actuator, and avoids damage to the valve stem or the actuator.

[0008] In order to illustrate how the transmission member is connected to the upper chamber, the present invention adopts a transition fit between the transmission member and the valve cover;

[0009] In this solution, a transmission member is provided in the upper cavity of the valve cover. There is a transition fit between the transmission member and the valve cover, and the gap between the transmission member and the valve cover is very small, thereby ensuring the stability of the transmission member during the up and down rotation movement.

[0010] In order to illustrate the specific structure of the transmission member, the utility model adopts an insertion groove for inserting the end of the valve stem on the top of the transmission member, and an installation groove for installing the ball core is opened upward at the bottom of the transmission member;

[0011] The valve stem and the transmission member can be installed through the insertion groove, and the transmission member and the ball core can be installed through the installation groove.

[0012] The beneficial effects of the utility model are as follows: the utility model is a pressure balancing structure of the upper and lower chambers of the transmission part in the ball valve, and a piston effect is formed between the upper chamber, the lower chamber and the transmission part. The medium flows from the lower chamber. When the ball valve is opened or closed, the high-pressure medium will act upward on the transmission part, and part of the medium enters the upper chamber from the lower chamber through the pressure flow groove, which greatly reduces the upward pressure of the high-pressure medium on the transmission part, reduces the requirements of the bracket and the actuator, and avoids damage to the valve stem or the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 It is the matching diagram of the transmission parts and the valve stem;

[0016] In the figure: 1-valve body, 11-lower chamber, 2-valve cover, 21-upper chamber, 3-valve stem, 4-transmission member, 41-pressure flow groove, 42-installation groove, 5-ball core, 6-valve seat. DETAILED DESCRIPTION

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0018] like Figure 1-2As shown, the utility model is a pressure balancing structure for the upper and lower chambers of a transmission member in a ball valve, comprising: a valve body 1, having a lower chamber 11 therein for facilitating medium circulation; a valve cover 2, to which the top of the valve body 1 is connected, having an upper chamber 21 therein; a valve stem 3, which is movably disposed within the valve cover 2; a transmission member 4, which is fixed to the bottom of the valve stem 3 and slidably disposed within the upper chamber 21; and a ball core 5, which is fixed to the bottom of the transmission member 4 and is adapted to rotate with the valve stem 3 and seal with the valve seat 6 within the valve body 1; wherein the transmission member 4 is provided with a pressure flow groove 41 communicating with the upper chamber 21 and the lower chamber 11;

[0019] In this solution, a spiral inner groove is provided on the top of the transmission member 4, a ball core 5 is provided on the bottom, a positioning pin that cooperates with the spiral inner groove is provided in the valve cover 2, the top of the valve stem 3 is connected to the actuator, and the bottom of the valve stem 3 is connected to the transmission member 4. The operation of the actuator drives the transmission member 4 and the ball core 5 to rotate up or down, sealing or separating the ball core 5 from the valve seat 3; a piston effect is formed between the upper chamber 21, the lower chamber 11, and the transmission member 4, and the medium flows from the lower chamber 11. When the ball valve is opened or closed, the high-pressure medium will act upward on the transmission member 4, and part of the medium enters the upper chamber 21 from the lower chamber 11 through the pressure flow groove 41, greatly reducing the upward pressure of the high-pressure medium on the transmission member 4, reducing the requirements of the bracket and the actuator, and avoiding damage to the valve stem 3 or the actuator.

[0020] like Figure 1 As shown, in order to illustrate how the transmission member and the upper chamber are connected, the utility model adopts a transition fit between the transmission member 4 and the valve cover 2;

[0021] In this solution, a transmission member 4 is provided in the upper cavity 21 of the valve cover 2. There is a transition fit between the transmission member 4 and the valve cover 2. The gap between the transmission member 4 and the valve cover 2 is very small, which ensures the stability of the transmission member 4 during the up and down rotation movement.

[0022] like Figure 2 As shown, in order to illustrate the specific structure of the transmission member, the utility model adopts the top of the transmission member 4 having an insertion groove for inserting the end of the valve stem, and the bottom of the transmission member 4 is upwardly opened with a mounting groove 42 for mounting the ball core 5;

[0023] The valve stem 3 and the transmission member 4 can be installed through the insertion groove, and the transmission member 4 and the ball core 5 can be installed through the installation groove 42.

[0024] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A pressure balancing structure for the upper and lower chambers of a transmission part in a ball valve, characterized in that: include: The valve body has a lower cavity therein for facilitating the flow of the medium; A valve cover, the top of the valve body is connected to the valve cover, and has an upper cavity therein; a valve stem movably disposed within the valve cover; a transmission member fixed to the bottom of the valve stem and slidably disposed in the upper cavity; and a ball core fixed to the bottom of the transmission member and adapted to rotate with the valve stem and seal with the valve seat in the valve body; Wherein, the transmission member is provided with a pressure flow groove which is in communication with the upper cavity and the lower cavity.

2. A pressure balancing structure for the upper and lower chambers of a transmission part in a ball valve according to claim 1, characterized in that: The transmission member and the valve cover are transitionally matched.

3. The pressure balancing structure for the upper and lower chambers of a transmission part in a ball valve according to claim 1, characterized in that: The top of the transmission member is provided with an insertion groove for inserting the end of the valve stem, and the bottom of the transmission member is upwardly provided with a mounting groove for mounting the ball core.

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