Stop valve actuating mechanism

Abstract

The utility model belongs to the technical field of gas safety cut-off valves, and particularly relates to a cut-off valve actuating mechanism, which comprises a cut-off valve diaphragm shell, a cut-off valve rod, a cut-off diaphragm and a cut-off main body, and optimizes and upgrades a trigger mechanism and a locking mechanism, so that the cut-off valve actuating mechanism has the advantages of relatively simple structure, good stability, smooth operation, difficulty in abrasion and the like. The service life is long, and the maintenance is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas safety cut-off valves, and particularly relates to a cut-off valve actuator. Background Art

[0002] The gas shut-off valve is a new type of safety supporting device for gas pipeline projects. There are still many structural forms in the existing technology, but the basic structural principles and basic structural components are basically the same, that is, when the pressure is detected to rise to the set value, the trigger mechanism triggers the cut-off body (that is, the action of the cut-off valve stem triggers the cut-off body), and the cut-off body has a cut-off valve shaft. When it is not triggered, the cut-off valve shaft is in a locked state and cannot rotate freely; when it is in the triggered state, the cut-off valve stem drives the locking assembly to move, so that the cut-off valve shaft is unlocked, that is, it can rotate freely; the structure and principle in the existing technology are roughly as described above, but there are generally differences in its trigger mechanism and locking mechanism, and there are also many similar structures. Some may have problems such as poor stability, easy wear and inconvenient maintenance. Utility Model Content

[0003] The utility model provides a cut-off valve actuator, which can solve the problems pointed out in the background technology.

[0004] A cut-off valve actuator comprises a cut-off valve diaphragm housing, a cut-off valve stem, a cut-off diaphragm and a cut-off body, wherein one end face of the cut-off diaphragm is connected to a ferrule, the ferrule is sleeved on the cut-off valve stem, a first ball fixing sleeve is provided on the inner side of the ferrule, a limiting movable hole for the movement of a first ball is provided on the first ball fixing sleeve, a first limiting groove cooperating with the first ball is provided at a corresponding position of the cut-off valve stem, an inner conical surface is provided at a corresponding position of the inner side of the ferrule, the inner conical surface is provided to provide a movable space for the first ball to detach from or enter a limited position, an elastic pressure piece is provided at one end of the ferrule away from the cut-off diaphragm, the elastic pressure piece exerts a force on the ferrule The force in the direction of the cut-off diaphragm is cut off, and the lower end of the cut-off valve stem is connected with an elastic pulling piece, and the elastic pulling piece is used to pull the cut-off valve stem to move downward. The lower end of the cut-off valve stem is provided with a cut-off impact head, and the lower end of the cut-off impact head is provided with a sliding rod. The sliding rod is slidably limited by a sliding rod limit sleeve, and the lower end of the sliding rod is provided with a ball head. The ball diameter of the ball head is larger than the diameter of the sliding rod to provide a moving space for the second ball. The ball head is provided with a second limiting groove cooperating with the second ball, and the second ball is limited by the second limiting groove and the third limiting groove. The third limiting groove is arranged on the cut-off valve shaft, and the lower end of the ball head is provided with a return elastic piece.

[0005] Preferably, a diaphragm tray is connected to one end surface of the cut diaphragm, and is connected to the ferrule via the diaphragm tray.

[0006] Preferably, the first ball fixing sleeve is connected to the cut-off valve stem limiting sleeve by threads, and the cut-off valve stem limiting sleeve is connected to the cut-off valve diaphragm housing by threads.

[0007] Preferably, the elastic pressure piece is a first compression spring, which is arranged between the sleeve and the first compression spring adjusting nut, and the first compression spring adjusting nut is threadedly connected to the cut-off valve diaphragm housing so that it can be reciprocated to adjust the force of the first compression spring.

[0008] Preferably, the elastic pulling member is a second compression spring, which is located between the cut-off impact head and the boss, and the cut-off impact head is connected to the lower end of the cut-off valve stem through threads.

[0009] Preferably, the slide rod limiting sleeve is connected in the cutting body by threads.

[0010] Preferably, the return elastic member is a third compression spring, which is located between the ball head and the sealing nut.

[0011] Preferably, the lower end of the ball head is connected to a manual cut-off valve stem, and the manual cut-off valve stem extends downwardly out of a sealing nut and is connected to the manual cut-off nut.

[0012] Beneficial effects: The utility model provides a cut-off valve actuator with a relatively simple structure, good stability, smooth operation, low wear, long service life and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A cross-sectional schematic diagram of the utility model Figure 1 ,

[0014] Figure 2 A cross-sectional schematic diagram of the utility model Figure 2 ,

[0015] Figure 3 For this utility model Figure 2 The enlarged schematic diagram of point A in the middle.

[0016] Description of reference numerals:

[0017] Numbers in the figure: cut-off valve diaphragm housing 1; cut-off valve stem 2; first limiting groove 71; cut-off diaphragm 3; diaphragm tray 31; cut-off body 4; sleeve 5; inner cone 51; first ball fixing sleeve 6; limiting movable hole 61; first ball 7; elastic pressure piece 8; elastic pulling piece 9; cut-off impact head 10; sliding rod 11; sliding rod limiting sleeve 12; ball head 13; second limiting groove 131; second ball 14; cut-off valve shaft 15; third limiting groove 151; return elastic piece 16; cut-off valve stem limiting sleeve 17; first compression spring adjusting nut 18; boss 19; sealing nut 20; manual cut-off valve stem 21; manual cut-off nut 22; gas connection end 23. DETAILED DESCRIPTION

[0018] A specific implementation of the present utility model is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific implementation mode.

[0019] Example 1: Figure 1-3 As shown, a cut-off valve actuator comprises a cut-off valve diaphragm housing 1, a cut-off valve stem 2, a cut-off diaphragm 3 and a cut-off body 4, one end face of the cut-off diaphragm 3 is connected to a ferrule 5, the ferrule 5 is sleeved on the cut-off valve stem 2, a first ball fixing sleeve 6 is provided on the inner side of the ferrule 5, a limiting movable hole 61 for the movement of a first ball 7 is provided on the first ball fixing sleeve 6, a first limiting groove 71 cooperating with the first ball 7 is provided at a corresponding position of the cut-off valve stem 2, an inner conical surface 51 is provided at a corresponding position of the inner side of the ferrule 5, the inner conical surface 51 is provided to provide a movable space for the first ball 7 to detach from or enter the limited position, an elastic pressure piece 8 is provided at one end of the ferrule 5 away from the cut-off diaphragm 3, the elastic pressure piece 8 applies pressure to the ferrule 5 toward the cut-off diaphragm 3 The lower end of the cut-off valve stem 2 is connected with an elastic pulling member 9, which is used to pull the cut-off valve stem 2 to move downward. The lower end of the cut-off valve stem 2 is provided with a cut-off impact head 10, and the lower end of the cut-off impact head 10 is provided with a sliding rod 11. The sliding rod 11 is slidably limited by a sliding rod limiting sleeve 12. The lower end of the sliding rod 11 is provided with a ball head 13. The ball diameter of the ball head 13 is larger than the diameter of the sliding rod 11, so as to provide a movable space for the second ball 14. The ball head 13 is provided with a second limiting groove 131 that cooperates with the second ball 14. The second ball 14 is limited by the second limiting groove 131 and the third limiting groove 151. The third limiting groove 151 is arranged on the cut-off valve shaft 15, and a return elastic member 16 is arranged at the lower end of the ball head 13.

[0020] Specifically, a diaphragm tray 31 is connected to an end face of one side of the cutting diaphragm 3, which is connected to the sleeve 5 through the diaphragm tray 31, the first ball fixing sleeve 6 is threadedly connected to the cutting valve stem limiting sleeve 17, the cutting valve stem limiting sleeve 17 is threadedly connected to the cutting valve diaphragm housing 1, the elastic pressure piece 8 is a first compression spring, the first compression spring is arranged between the sleeve 5 and the first compression spring adjusting nut 18, the first compression spring adjusting nut 18 is threadedly connected to the cutting valve diaphragm housing 1 so that it can be reciprocated to adjust the force of the first compression spring, the elastic pulling piece 9 is a second compression spring, which is located between the cutting impact head 10 and the boss 19, the cutting impact head 10 is threadedly connected to the lower end of the cutting valve stem 2, the sliding rod limiting sleeve 12 is threadedly connected to the cutting body 4, and the return elastic piece 16 is a third compression spring, which is located between the ball head 13 and the sealing nut 20.

[0021] The working principle of the utility model is as follows: the gas enters from the gas connection end 23. When the pressure increases, the cutting diaphragm 3 applies a force on the ferrule 5 in the direction of the ferrule 5. When this force is greater than the force of the elastic pressure piece 8 on the ferrule 5, the cutting diaphragm 3 drives the ferrule 5 to move to one side of the ferrule 5. The inner conical surface 51 of the ferrule 5 will gradually correspond to the first ball 7. After the first ball 7 corresponds to the inner conical surface 51, it will have a movable space, that is, it can be separated from the limit position. At this time, the elastic pulling piece 9 will pull the cutting valve stem 2 to move downward, and the cutting impact head 10 at the lower end of the cutting valve stem 2 will impact the sliding rod 11 and the ball head 13 to move downward. At this time, the second ball 14 has a movable space and can be separated from the limit position, that is, the cutting valve shaft 15 is in an unlocked state and can rotate freely; when the pressure value is lower than the set value, the cutting valve stem 2 automatically returns under the action of the return elastic piece 16, and the cutting valve shaft 15 is in a locked state.

[0022] In some embodiments, the lower end of the ball head 13 is connected to a manual cut-off valve stem 21 , and the manual cut-off valve stem 21 extends downward from a sealing nut 20 and is connected to a manual cut-off nut 22 , and manual cut-off can be achieved by pulling the manual cut-off nut 22 downward.

[0023] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A cut-off valve actuator, comprising a cut-off valve diaphragm housing (1), a cut-off valve stem (2), a cut-off diaphragm (3) and a cut-off body (4), characterized in that: The end face of one side of the cut-off diaphragm (3) is connected to a ferrule (5), and the ferrule (5) is sleeved on the cut-off valve stem (2). A first ball fixing sleeve (6) is provided on the inner side of the ferrule (5), and a limiting movable hole (61) is provided on the first ball fixing sleeve (6) for the first ball (7) to move. A first limiting groove (71) cooperating with the first ball (7) is provided at a corresponding position of the cut-off valve stem (2). An inner conical surface (51) is provided at a corresponding position of the inner side of the ferrule (5), and the inner conical surface (51) is provided to provide a movable space for the first ball (7) to leave or enter the limiting position. An elastic pressure piece (8) is provided at one end of the ferrule (5) away from the cut-off diaphragm (3), and the elastic pressure piece (8) applies a force to the ferrule (5) in the direction of the cut-off diaphragm (3). The lower end of the cut-off valve stem (2) is connected to an elastic pulling piece (9 ), the elastic pulling member (9) is used to pull the cut-off valve stem (2) to move downward, the cut-off valve stem (2) is provided with a cut-off impact head (10) at the lower end, the cut-off impact head (10) is provided with a sliding rod (11) at the lower end, the sliding rod (11) is slidably limited by a sliding rod limiting sleeve (12), the lower end of the sliding rod (11) is provided with a ball head (13), the ball diameter of the ball head (13) is larger than the diameter of the sliding rod (11), so as to provide a movable space for the second ball (14), the ball head (13) is provided with a second limiting groove (131) cooperating with the second ball (14), the second ball (14) is limited by the second limiting groove (131) and a third limiting groove (151), the third limiting groove (151) is provided on the cut-off valve shaft (15), and the lower end of the ball head (13) is provided with a return elastic member (16).

2. A shut-off valve actuator according to claim 1, characterized in that: A diaphragm tray (31) is connected to one end surface of the cut diaphragm (3), and is connected to the clamping sleeve (5) via the diaphragm tray (31).

3. A shut-off valve actuator according to claim 2, characterized in that: The first ball fixing sleeve (6) is connected to the cut-off valve stem limiting sleeve (17) via a threaded connection, and the cut-off valve stem limiting sleeve (17) is connected to the cut-off valve diaphragm housing (1) via a threaded connection.

4. A shut-off valve actuator according to claim 1, characterized in that: The elastic pressure member (8) is a first compression spring, which is arranged between the clamping sleeve (5) and a first compression spring adjusting nut (18), and the first compression spring adjusting nut (18) is connected to the cut-off valve diaphragm housing (1) via a thread so that it can be reciprocated to adjust the action force of the first compression spring.

5. A shut-off valve actuator according to claim 1, characterized in that: The elastic pulling member (9) is a second compression spring, which is located between the cut-off impact head (10) and the boss (19); the cut-off impact head (10) is connected to the lower end of the cut-off valve stem (2) via a thread.

6. A shut-off valve actuator according to claim 1, characterized in that: The slide rod limiting sleeve (12) is connected inside the cutting body (4) via threads.

7. A shut-off valve actuator according to claim 1, characterized in that: The return elastic member (16) is a third compression spring, which is located between the ball head (13) and the sealing nut (20).

8. A shut-off valve actuator according to any one of claims 1 to 7, characterized in that: The lower end of the ball head (13) is connected to a manual cut-off valve stem (21), and the manual cut-off valve stem (21) extends downwardly out of a sealing nut (20) and is connected to a manual cut-off nut (22).

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