Bidirectional wedge-caulking type forced sealing ball valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a bidirectional wedge-caulking type forced sealing ball valve which comprises a valve body with a valve cavity and a valve rod rotationally lifted in the valve body, one end of the valve cavity is a liquid inlet flow channel, the other end of the valve cavity is a liquid outlet flow channel, a ball core is rotationally arranged in the valve cavity and comprises two ball clacks, and the bottoms of the two ball clacks are hinged. A circulation cavity is defined by the two; the lower end of the valve rod is provided with two symmetrical outer wedge surfaces which are gradually close to each other from top to bottom and two symmetrical inner wedge surfaces which are gradually close to each other from top to bottom. The ball core is provided with a transmission pin used for abutting against the outer wedge surfaces and the inner wedge surfaces. Two-way symmetrical wedge-caulking is achieved through the two symmetrically-arranged outer wedge faces, so that the problems of one-way abrasion and uneven stress of the valve rod can be avoided, the two ball clacks are folded through the two symmetrically-arranged inner wedge faces, friction between the ball core and the valve seat in the rotating process is avoided, the service life of the sealing faces of the ball core is prolonged, and the service life of the ball core is prolonged. And the rotating torque of the valve rod is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a bidirectional wedge-tightening forced sealing ball valve. Background Art

[0002] A Chinese patent application numbered CN201320360487.5 discloses a track-type hard-sealed ball valve, which includes a valve body, a ball disposed in the valve cavity, a valve seat disposed between the ball and the outflow channel, a valve stem connected to the upper end of the ball for rotating the ball, an inclined surface disposed at the end of the valve stem close to the ball, the upper end of the inclined surface tilted toward the valve seat, a flat surface disposed at the lower end of the inclined surface, a pin disposed on the ball and disposed on both sides of the inclined surface, although there are two inclined surfaces in the application, only one inclined surface cooperates with the pin shaft during the descent of the valve stem to generate a wedge force, forming a unidirectional wedge, which leads to the problem of unidirectional wear of the valve stem and uneven force. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problem in the prior art that during the valve stem descending process, only one inclined surface cooperates with the pin shaft to generate a wedge force, forming a one-way wedge, which leads to one-way wear of the valve stem and uneven force, a two-way wedge-tightened forced sealing ball valve is provided.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a bidirectional wedge-tightening forced sealing ball valve, comprising a valve body with a valve cavity and a valve stem that is rotatably raised and lowered in the valve body, one end of the valve cavity is a liquid inlet channel, and the other end is a liquid outlet channel, and a ball core is rotatably arranged inside the valve cavity, the ball core comprises two ball petals that are hinged at the bottom and can be closed or opened during the lifting and lowering of the valve stem, and the two petals are enclosed to form a flow cavity for connecting the liquid inlet channel and the liquid outlet channel, and the ends of the liquid inlet channel and the liquid outlet channel close to the ball core are both provided with valve seats;

[0005] The lower end of the valve stem is provided with two symmetrically arranged outer wedge surfaces that gradually approach each other from top to bottom and two symmetrically arranged inner wedge surfaces that gradually approach each other from top to bottom, and the ball core is provided with a transmission pin for cooperating with the outer wedge surfaces and the inner wedge surfaces;

[0006] Furthermore, a reinforcing rib is provided between the two inner wedge surfaces.

[0007] Furthermore, a track groove is provided at the upper end of the valve stem, and the track groove includes a straight stroke section located at the upper end and a spiral section located at the lower end, and a guide pin cooperating with the track groove is provided on the valve body.

[0008] Furthermore, there are two track grooves, which are spaced apart along the circumference of the valve stem.

[0009] Furthermore, a hinged portion is protruded from the bottom of the ball core, and an accommodating cavity for accommodating the hinged portion is provided at the bottom of the valve cavity.

[0010] Furthermore, a sliding bearing is installed at a portion of the accommodating cavity close to the cavity wall, and a rolling bearing is installed at a portion of the accommodating cavity close to the cavity bottom.

[0011] The beneficial effects of the utility model are as follows: the utility model utilizes two symmetrically arranged outer wedge surfaces to achieve bidirectional symmetrical wedging, thereby avoiding the problems of unidirectional wear and uneven force on the valve stem, and utilizes two symmetrically arranged inner wedge surfaces to close the two ball petals, so that there is no friction between the ball core and the valve seat during the rotation of the ball core, thereby extending the service life of the ball core sealing surface and reducing the rotation torque of the valve stem.

[0012] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

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

[0015] Figure 2 It is the front view of the valve stem;

[0016] Figure 3 It is a three-dimensional structural diagram of the valve stem;

[0017] In the figure:

[0018] 1. Valve body; 101. Liquid inlet channel; 102. Liquid outlet channel; 103. Accommodating chamber; 2. Valve stem; 201. Outer wedge surface; 202. Inner wedge surface; 203. Straight travel section; 204. Spiral section; 205. Reinforcing rib; 3. Ball core; 301. Ball flap; 302. Flow chamber; 303. Hinge; 4. Transmission pin; 5. Guide pin; 6. Sliding bearing; 7. Rolling bearing; 8. Valve seat. DETAILED DESCRIPTION

[0019] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0020] like Figure 1-Figure 3As shown, a bidirectional wedge-tightening forced sealing ball valve comprises a valve body 1 having a valve cavity and a valve stem 2 which is rotatably raised and lowered in the valve body 1, the upper end of the valve stem 2 protrudes from the valve body 1 and is connected to an actuator, one end of the valve cavity is an inlet channel 101, and the other end is an outlet channel 102, and a ball core 3 is rotatably arranged inside the valve cavity, the ball core 3 comprises two ball petals 301 which are hingedly arranged at the bottom and can be closed or opened during the lifting and lowering process of the valve stem 2, and the two together form a flow cavity 302 for connecting the inlet channel 101 and the outlet channel 102, and a valve seat 8 is provided at one end of the inlet channel 101 and the outlet channel 102 close to the ball core 3, when the flow cavity 302 is opposite to the valve seat 8, the valve is in an open state, and when the sealing surface of the ball core 3 is opposite to the valve seat 8, the valve is in a closed state;

[0021] The valve stem 2 is provided with a wedge-shaped portion at the lower end, and the wedge-shaped portion includes two symmetrically arranged outer wedge surfaces 201 and two symmetrically arranged inner wedge surfaces 202 that are gradually approaching from top to bottom. The ball core 3 is provided with a transmission pin 4 for cooperating with the outer wedge surfaces 201 and the inner wedge surfaces 202, and the number of the transmission pins 4 corresponds to the outer wedge surfaces 201 and the inner wedge surfaces 202. In the process of the actuator driving the valve stem 2 to move up and down, the ball flap 301 is limited by the transmission pin 4 and cannot rise or fall with the valve stem 2, but can only close or open the ball core 3 with the wedge-shaped portion of the valve stem 2. Specifically, when the outer wedge surface 201 abuts against the corresponding transmission pin 4 (that is, the transmission pin 4 located on the outside), it applies force to the ball core 3 through the transmission pin 4. The applied force causes the two ball petals 301 to move away from each other with the hinge point as the center, thereby achieving the sealing of the ball core 3 and the valve seat 8. The two outer wedge surfaces 201 are symmetrically arranged to achieve bidirectional symmetrical wedging, thereby avoiding the problems of unidirectional wear and uneven force on the valve stem 2; when the outer wedge surface 201 and the corresponding transmission pin 4 are disengaged, the inner wedge surface 202 and the corresponding transmission pin 4 (that is, the transmission pin 4 located on the inner side) are abutted, and a force is applied to the ball core 3 through the transmission pin 4 to cause the two ball petals 301 to move closer to each other with the hinge point as the center, thereby achieving the separation of the ball core 3 and the valve seat 8. The disengaged ball core 3 and the valve seat 8 have no friction when they move relative to each other, thereby extending the service life of the sealing surface and reducing the torque of the valve stem 2 rotation.

[0022] When the valve is opened, the actuator pulls the valve stem 2 to move upward, and the outer wedge surface 201 and the transmission pin 4 abutting against it are disengaged, thereby releasing the squeezing of the ball petal 301. At the same time, the inner wedge surface 202 applies force to the corresponding transmission pin 4, driving the two ball petals 301 to close, so that the ball core 3 and the valve seat 8 are disengaged, and then the valve stem 2 drives the ball core 3 to rotate, so that the flow cavity 302 is connected with the liquid inlet channel 101 and the liquid outlet channel 102, and the fluid in the liquid inlet channel 101 enters the liquid outlet channel 102 from the flow cavity 302.

[0023] When the valve is closed, the actuator first pushes the valve stem 2 downward and drives the valve stem 2 to rotate. The valve stem 2 drives the ball core 3 to rotate so that the sealing surface of the ball core 3 is aligned with the valve seat 8. The valve stem 2 stops rotating and continues to move downward until the outer wedge surface 201 abuts against the transmission pin 4 to open the two ball petals 301, thereby achieving sealing between the ball petals 301 and the valve seat 8.

[0024] In some examples, a reinforcing rib 205 is provided between the two inner wedge surfaces 202 to increase the strength of the lower end of the valve stem 2 and to prevent the valve stem 2 from deforming when the wedge-shaped portion is closed or the ball core 3 is opened, thereby preventing the valve stem 2 from failing to function.

[0025] In some examples, a track groove is provided at the upper end of the valve stem 2, and the track groove includes a straight stroke section 203 located at the upper end and a spiral section 204 located at the lower end, and the two are connected to each other. A guide pin 5 cooperating with the track groove is provided on the valve body 1, and the guide pin 5 cooperates with the straight stroke section 203 to drive the valve stem 2 to rise and fall to control the wedge-shaped part of the valve stem 2 to close or open the ball core 3, so as to achieve the separation or sealing of the ball core 3 and the valve seat 8, and the spiral section 204 cooperates with the guide pin 5 to drive the valve stem 2 to rotate and rise to switch the valve to an open or closed state.

[0026] In some examples, there are two track grooves, which are spaced apart along the circumference of the valve stem 2. Correspondingly, there are two guide pins 5, and the two guide pins 5 correspond one-to-one to the two track grooves, so that the movement of the valve stem 2 is more stable.

[0027] In some examples, a hinge portion 303 is formed protruding from the bottom of the ball core 3, and the two ball petals 301 rotate around the hinge portion 303 to achieve closing or opening. A receiving cavity 103 for receiving the hinge portion 303 is provided at the bottom of the valve cavity.

[0028] In some examples, a sliding bearing 6 is installed near the wall of the accommodating cavity 103 for positioning the ball core 3 , and a rolling bearing 7 is installed near the bottom of the accommodating cavity 103 for reducing friction during the rotation of the ball core 3 .

[0029] Working principle:

[0030] When the valve is opened, the actuator pulls the valve stem 2 to move upward. At this time, the guide pin 5 cooperates with the straight stroke section 203, and the outer wedge surface 201 and the transmission pin 4 abutting against it are disengaged, thereby releasing the squeezing of the ball flap 301. At the same time, the inner wedge surface 202 applies force to the corresponding transmission pin 4, driving the two ball flaps 301 to close, so that the sealing surface of the ball core 3 and the valve seat 8 are disengaged, and then the guide pin 5 cooperates with the spiral section 204 to drive the valve stem 2 to rotate, and the valve stem 2 drives the ball core 3 to rotate. The rotation of the ball core 3 causes the flow chamber 302 to dock with the inlet channel 101 and the outlet channel 102, and the fluid in the inlet channel 101 enters the outlet channel 102 from the flow chamber 302.

[0031] When the valve is closed, the actuator first pushes the valve stem 2 to move downward. At this time, the guide pin 5 cooperates with the spiral section 204 to drive the valve stem 2 to rotate, and the valve stem 2 drives the ball core 3 to rotate, so that the sealing surface of the ball core 3 is aligned with the valve seat 8. Then the guide pin 5 cooperates with the straight stroke section 203, the valve stem 2 stops rotating and continues to move downward until the outer wedge surface 201 abuts against the transmission pin 4 to open the two ball petals 301, thereby achieving the sealing of the ball petals 301 and the valve seat 8.

[0032] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-way wedge-tight forced sealing ball valve, characterized in that: It comprises a valve body (1) having a valve cavity and a valve stem (2) which is rotatably raised and lowered in the valve body (1), wherein one end of the valve cavity is a liquid inlet channel (101) and the other end is a liquid outlet channel (102), and a ball core (3) is rotatably arranged inside the valve cavity, and the ball core (3) comprises two ball petals (301) which are hingedly arranged at the bottom and can be closed or opened during the lifting and lowering process of the valve stem (2), and the two petals are enclosed to form a flow cavity (302) for connecting the liquid inlet channel (101) and the liquid outlet channel (102), and valve seats (8) are provided at one end of the liquid inlet channel (101) and the liquid outlet channel (102) close to the ball core (3); The lower end of the valve stem (2) is provided with two symmetrically arranged outer wedge surfaces (201) that gradually approach each other from top to bottom and two symmetrically arranged inner wedge surfaces (202) that gradually approach each other from top to bottom, and the ball core (3) is provided with a transmission pin (4) for cooperating with the outer wedge surfaces (201) and the inner wedge surfaces (202).

2. A bidirectional wedge-tight forced sealing ball valve according to claim 1, characterized in that: A reinforcing rib (205) is provided between the two inner wedge surfaces (202).

3. A bidirectional wedge-tight forced sealing ball valve according to claim 1, characterized in that: The upper end of the valve stem (2) is provided with a track groove, the track groove comprising a linear travel section (203) located at the upper end and a spiral section (204) located at the lower end, and the valve body (1) is provided with a guide pin (5) that cooperates with the track groove.

4. A bidirectional wedge-tight forced sealing ball valve according to claim 3, characterized in that: There are two track grooves, which are spaced apart and distributed along the circumference of the valve stem (2).

5. A bidirectional wedge-tight forced sealing ball valve according to claim 1, characterized in that: A hinge part (303) is formed protruding from the bottom of the ball core (3), and a receiving cavity (103) for receiving the hinge part (303) is provided at the bottom of the valve cavity.

6. A bidirectional wedge-tight forced sealing ball valve according to claim 5, characterized in that: A sliding bearing (6) is installed at a position of the accommodating cavity (103) close to the cavity wall, and a rolling bearing (7) is installed at a position of the accommodating cavity (103) close to the cavity bottom.

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