Drive mechanism for a forced seal stopcock valve

Abstract

The utility model discloses a transmission mechanism of forced sealing plug valve, including support, input shaft, output shaft and stroke conversion axle sleeve, the support is the cylinder support who has the through -hole along the axial direction, and output shaft and stroke conversion axle sleeve are in the through -hole of support and are set in from below to above in proper order, the top of stroke conversion axle sleeve is fixedly connected with input shaft, and the one end of input shaft is not connected with stroke conversion axle sleeve is the executor cooperation end, and the top of output shaft is fixedly connected with the plug -in portion of clearance fit that forms in the stroke conversion axle sleeve, and the bottom of output shaft is the valve cooperation end. The utility model discloses a transmission mechanism can realize straight stroke and angular stroke two kinds of driving mode simultaneously, make the opening and closing action of forced sealing plug valve more convenient control, and transmission mechanism only needs one executor drive, compares the technical scheme that needs to adopt at least two executor in prior art, and the utility model can effectively simplify the transmission structure of forced sealing plug valve to effectively reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and in particular to a transmission mechanism for a forced sealing plug valve. Background Technology

[0002] Forced-seal plug valves are widely used in refined oil depots, aviation kerosene, and metering systems due to their reliable sealing, convenient maintenance, and long service life. Forced-seal plug valves are typically operated manually or electrically. In certain high-safety applications, however, an emergency shut-off function is required, usually achieved using pneumatic, pneumatic-hydraulic, or electro-hydraulic actuators.

[0003] In the closing process of a forced-seal plug valve, the valve core needs to be rotated to the closed position first, and then lowered to compress the sealing element to achieve a seal. In the opening process, the valve core needs to be lifted to disengage the sealing surface from the valve body before rotating to the open position. Due to these unique opening and closing methods, the valve core's movement includes both linear and angular strokes. Existing actuators typically only achieve linear or angular strokes individually, thus requiring different actuators to realize both types of valve core movement in a forced-seal plug valve. For example, invention application CN116892647A discloses a composite actuating mechanism that combines linear and angular strokes. Its technical solution uses a rotary actuator and a lifting actuator to achieve the linear and angular stroke driving methods respectively. Therefore, different actuators must be used to achieve different motion modes, resulting in a complex and costly actuator structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a transmission mechanism for a forced sealing plug valve with a simple structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a transmission mechanism for a forced sealing plug valve, including a bracket, an input shaft, an output shaft, and a stroke conversion sleeve; the bracket is a cylindrical bracket with a through hole along the axial direction, and the output shaft and the stroke conversion sleeve are movably arranged in the through hole of the bracket from bottom to top; the top of the stroke conversion sleeve is fixedly connected to the input shaft, the end of the input shaft not connected to the stroke conversion sleeve is the actuator mating end, the top of the output shaft is fixedly connected to an insertion part that inserts into the stroke conversion sleeve to form a clearance fit, and the bottom of the output shaft is the valve mating end; The upper part of the bracket is provided with a linear stroke limiting groove extending along the axial direction. A linear stroke limiting pin is fixed on the stroke conversion bushing and inserted into the linear stroke limiting groove to form a sliding fit. The stroke conversion bushing is provided with an S-shaped guide groove arranged in a spiral shape along the circumference. A first guide pin is fixed on the insertion part of the output shaft and inserted into the S-shaped guide groove to form a sliding fit. The output shaft is provided with an L-shaped guide groove, which is composed of a longitudinal groove arranged along the axial direction of the output shaft and a transverse groove arranged along the circumference of the output shaft. A second guide pin is fixed on the inner wall of the bracket and inserted into the L-shaped guide groove to form a sliding fit.

[0006] As an improvement to the above solution: the top of the S-shaped guide groove is located directly below the linear travel limiting groove and directly above the second guide pin; when the first guide pin slides to the bottom of the S-shaped guide groove, the bottom of the S-shaped guide groove is aligned with the longitudinal groove of the L-shaped guide groove, and the second guide pin slides to the end of the horizontal section of the L-shaped guide groove; when the first guide pin slides to the top of the S-shaped guide groove, the top of the S-shaped guide groove is aligned with the transverse groove of the L-shaped guide groove, and the second guide pin slides into the longitudinal groove of the L-shaped guide groove.

[0007] As an improvement to the above scheme: the number of linear stroke limiting groove, linear stroke limiting pin, S-shaped guide groove, first guide pin, L-shaped guide groove and second guide pin are all two; the two linear stroke limiting grooves and the two second guide pins are symmetrically arranged with the axis of the bracket as the reference, the two linear stroke limiting pins and the two S-shaped guide grooves are symmetrically arranged with the axis of the stroke conversion bushing as the reference, and the two L-shaped guide grooves and the two second guide pins are symmetrically arranged with the axis of the output shaft as the reference.

[0008] As an improvement to the above solution, the actuator mating end of the input shaft is provided with an external thread.

[0009] As an improvement to the above solution: the top of the bracket is the actuator connection end, and the bottom of the bracket is the valve connection end; both the top and bottom of the bracket are fixedly connected to a connecting plate, and the connecting plate is provided with multiple connection holes.

[0010] The beneficial effects of this utility model are as follows: This utility model can simultaneously realize both linear and rotary stroke driving modes through the transmission mechanism. Thus, by operating the transmission mechanism, the valve core of the forced sealing plug valve can be rotated and raised or lowered, making the opening and closing action of the forced sealing plug valve easier to control. The transmission mechanism only requires one actuator to drive it. Compared with the existing technology that requires at least two actuators, this utility model can effectively simplify the transmission structure of the forced sealing plug valve, thereby effectively reducing production costs. Attached Figure Description

[0011] Figure 1 This is an axonometric view of the half-section structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a front view of the present invention; Figure 4 This is a schematic diagram of the stroke conversion bushing. Figure 5 This is a schematic diagram of the output shaft. Figure 6 This is a schematic diagram illustrating the process of controlling the valve opening according to this utility model; Figure 7 This is a schematic diagram illustrating the process of controlling the valve to close according to this utility model.

[0012] The markings in the diagram are: 100-bracket, 110-linear stroke limit groove, 120-second guide pin, 200-input shaft, 300-output shaft, 310-plug part, 320-first guide pin, 330-L-shaped guide groove, 400-stroke conversion bushing, 410-linear stroke limit pin, 420-S-shaped guide groove. Detailed Implementation

[0013] To facilitate understanding of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0014] In the description of this utility model, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] like Figures 1 to 3As shown, the transmission mechanism of the forced-seal plug valve disclosed in this utility model consists of a bracket 100, an input shaft 200, an output shaft 300, and a stroke conversion sleeve 400. The bracket 100 serves as the mounting base for the entire transmission mechanism and is used to connect the actuator of the forced-seal plug valve to the valve body. The bracket 100 is a cylindrical bracket with an internal axial through hole. Both the output shaft 300 and the stroke conversion sleeve 400 are located within the through hole of the bracket 100, with the stroke conversion sleeve 400 positioned above the output shaft 300. The top of the bracket 100 is the actuator connection end, and the bottom of the bracket 100 is the valve connection end. Connecting discs are fixedly connected to both the top and bottom of the bracket 100. These connecting discs have multiple connection holes. The actuator connection section of the bracket 100 is fixedly connected to the actuator by bolts engaging with the connection holes on the connecting discs. The valve connection end of the bracket 100 is fixedly connected to the valve body of the forced-seal plug valve by bolts engaging with the connection holes on the connecting discs. The bottom end of the input shaft 200 extends downward into the through hole of the bracket 100 and is fixedly connected to the top end of the stroke conversion sleeve 400. The top end of the input shaft 200 extends outside the bracket 100. The top end of the input shaft 200 is the actuator mating end, and the actuator mating end of the input shaft 200 is provided with an external thread to form a threaded connection with the actuator. Figure 4 and Figure 5 As shown, the stroke conversion sleeve 400 is a bottom-opening sleeve structure. The top end of the output shaft 300 is fixedly connected to the insertion part 310. The insertion part 310 of the output shaft 300 is inserted upward into the opening of the stroke conversion sleeve 400 to form a clearance fit, so that the insertion part 310 of the output shaft 300 and the stroke conversion sleeve 400 can rotate relative to each other. The bottom end of the output shaft 300 is the valve mating end. The bottom end of the output shaft 300 is fixedly connected to the valve core of the forced sealing plug valve. The movement of the output shaft 300 drives the valve core to move synchronously.

[0016] This invention uses an actuator to drive the input shaft 200 in the transmission mechanism, enabling the input shaft 200 to move up and down along the axial direction of the bracket 100. The lifting and lowering of the input shaft 200 synchronously moves the stroke conversion sleeve 400, ultimately causing the output shaft 300 to rotate or move up and down, thus achieving the rotation and lifting of the valve core. Specifically, as... Figures 1 to 5As shown, this utility model provides a linear stroke limiting groove 110 on the bracket 100. The linear stroke limiting groove 110 is an elongated circular groove extending along the axial direction of the bracket 100 on its circumferential surface. The linear stroke limiting groove 110 is located at the upper part of the bracket 100 and cooperates with a linear stroke limiting pin 410 fixed at the upper part of the stroke conversion sleeve 400. The linear stroke limiting pin 410 is fixed on the stroke conversion sleeve 400 and extends radially along the stroke conversion sleeve 400 before being inserted into the linear stroke limiting groove 110. The linear stroke limiting pin 410 can slide within the linear stroke limiting groove 110. Through the limiting cooperation between the linear stroke limiting groove 110 and the linear stroke limiting pin 410, when the actuator drives the input shaft 200 to move, the stroke conversion sleeve 400 can only perform vertical lifting and lowering movements. Specifically, as shown... Figures 1 to 5 As shown, this utility model provides an S-shaped guide groove 420 at the lower part of the stroke conversion sleeve 400. The S-shaped guide groove 420 is a multi-segment arc-shaped groove arranged spirally along the axial direction of the stroke conversion sleeve 400. Simultaneously, a first guide pin 320 that cooperates with the S-shaped guide groove 420 is fixedly provided on the insertion part 310 of the output shaft 300. The insertion part 310 of the output shaft 300 is inserted upward into the stroke conversion sleeve 400, and the first guide pin 320 on the insertion part 310 is inserted into the S-shaped guide groove 420 on the stroke conversion sleeve 400, allowing the first guide pin 320 to slide within the S-shaped guide groove 420. Through the limiting cooperation between the S-shaped guide groove 420 and the first guide pin 320, when the stroke conversion sleeve 400 drives the output shaft 300 to move, the output shaft 300 can rotate relative to the stroke conversion sleeve 400 while also performing a lifting motion. Specifically, as shown... Figures 1 to 5 As shown, this utility model also provides an L-shaped guide groove 330 on the output shaft 300. The L-shaped guide groove 330 is an L-shaped groove composed of a longitudinal groove and a transverse groove connected together. The longitudinal groove is arranged along the axial direction of the output shaft 300 on the circumferential surface of the output shaft 300, and the transverse groove is arranged along the circumferential direction of the output shaft 300 on the circumferential surface of the output shaft 300. At the same time, a second guide pin 120 that cooperates with the L-shaped guide groove 330 is fixed on the bracket 100. The second guide pin 120 is fixed on the inner wall of the bracket 100 and inserted into the L-shaped guide groove 330, so that the second guide pin 120 can slide in the L-shaped guide groove 330. Through the limiting cooperation between the second guide pin 120 and the L-shaped guide groove 330, the relative movement between the output shaft 300 and the bracket 100 can be switched between linear stroke and angular stroke.

[0017] Furthermore, in order to ensure the stability of the transmission mechanism's movement, such as Figures 1 to 3As shown, the present invention comprises two linear stroke limiting grooves 110, two linear stroke limiting pins 410, two S-shaped guide grooves 420, two first guide pins 320, two L-shaped guide grooves 330, and two second guide pins 120. The two linear stroke limiting grooves 110 and the two second guide pins 120 are symmetrically arranged with respect to the axis of the bracket 100. The two linear stroke limiting pins 410 and the two S-shaped guide grooves 420 are symmetrically arranged with respect to the axis of the stroke conversion bushing 400. The two L-shaped guide grooves 330 and the two second guide pins 120 are symmetrically arranged with respect to the axis of the output shaft 300.

[0018] Furthermore, to ensure consistent movement of the input shaft 200, output shaft 300, and stroke conversion sleeve 400, such as... Figure 1 As shown, in this utility model, the top end of the S-shaped guide groove 420 is located directly below the linear stroke limiting groove 110 and directly above the second guide pin 120; when the first guide pin 320 slides to the bottom end of the S-shaped guide groove 420, the bottom end of the S-shaped guide groove 420 is aligned with the longitudinal groove of the L-shaped guide groove 330, and the second guide pin 120 slides to the end of the horizontal section of the L-shaped guide groove 330; when the first guide pin 320 slides to the top end of the S-shaped guide groove 420, the top end of the S-shaped guide groove 420 is aligned with the transverse groove of the L-shaped guide groove 330, and the second guide pin 120 slides into the longitudinal groove of the L-shaped guide groove 330.

[0019] like Figure 6 As shown, the operation flow for opening the forced sealing plug valve of this utility model is as follows: 1. When the actuator operates, it lifts the input shaft 200. Under the limiting cooperation of the linear stroke limit pin 410 and the linear stroke limit groove 110, the input shaft 200 rises vertically. At this time, since the first guide pin 320 is at the top of the S-shaped guide groove 420 and the second guide pin 120 is at the top of the longitudinal groove of the L-shaped guide groove 330, the output shaft 300 and the stroke conversion sleeve 400 cannot rotate relative to each other. The stroke conversion sleeve 400 and the output shaft 300 rise together with the input shaft 200. The second guide pin 120 moves relative to the L-shaped guide groove 330, so that the second guide pin 120 gradually approaches the bottom of the longitudinal groove of the L-shaped guide groove 330. During this process, the output shaft 300 drives the valve core connected to it to rise synchronously. 2. When the second guide pin 120 moves completely to the bottom of the longitudinal groove of the L-shaped guide groove 330, an axial limit is formed between the second guide pin 120 and the L-shaped guide groove 330. At the same time, the first guide pin 320 slides downward along the S-shaped guide groove 420, driving the output shaft 300 to rotate. The second guide pin 120 slides along the transverse groove of the L-shaped guide groove 330. During this process, the output shaft 300 drives the valve core connected to it to rotate synchronously. 3. When the second guide pin 120 moves to the end of the horizontal groove of the L-shaped guide groove 330, the output shaft 300 stops rotating, the valve core also stops rotating, the forced sealing plug valve is in the fully open state, and the opening action of the forced sealing plug valve ends.

[0020] like Figure 7 As shown, the operation flow of closing the forced sealing plug valve of this utility model is as follows: 1. When the actuator operates, it presses down the input shaft 200. Under the limiting cooperation of the linear stroke limit pin 410 and the linear stroke limit groove 110, the input shaft 200 descends vertically. At this time, since the first guide pin 320 is at the bottom end of the S-shaped guide groove 320, and the second guide pin 120 is at the end of the horizontal groove of the L-shaped guide groove 330, the second guide pin 120 and the L-shaped guide groove 330 form an axial limit, so that the output shaft 300 cannot move vertically but can only rotate. The first guide pin 320 slides upward spirally along the S-shaped guide groove 320. During this process, the output shaft 300 drives the valve core connected to it to rotate synchronously. 2. When the second guide pin 120 moves to the bottom of the longitudinal groove of the L-shaped guide groove 330, the second guide pin 120 and the L-shaped guide groove 330 form a circumferential limit, and at the same time the first guide pin 320 moves to the top of the S-shaped guide groove 320, the output shaft 300 can no longer rotate, and the valve core rotates into place. 3. The actuator continues to press down the input shaft 200, and the stroke conversion sleeve 400 presses down the output shaft 300, causing the second guide pin 120 to move upward along the longitudinal groove of the L-shaped guide groove 330 until the second guide pin 120 moves to the top of the longitudinal groove of the L-shaped guide groove 330. During this process, the output shaft 300 drives the valve core connected to it to descend synchronously, so that the valve core and the valve body form a seal, and the closing action of the forced sealing plug valve ends.

Claims

1. A transmission mechanism for a forced-sealing plug valve, characterized in that: The device includes a bracket (100), an input shaft (200), an output shaft (300), and a stroke conversion sleeve (400). The bracket (100) is a cylindrical bracket with a through hole along the axial direction. The output shaft (300) and the stroke conversion sleeve (400) are movably arranged in the through hole of the bracket (100) from bottom to top. The top of the stroke conversion sleeve (400) is fixedly connected to the input shaft (200). The end of the input shaft (200) not connected to the stroke conversion sleeve (400) is the actuator mating end. The top of the output shaft (300) is fixedly connected to a plug-in part (310) that is inserted into the stroke conversion sleeve (400) to form a clearance fit. The bottom of the output shaft (300) is the valve mating end. The upper part of the bracket (100) is provided with a straight stroke limiting groove that extends along the axial direction. (110), a straight stroke limiting pin (410) is fixed on the stroke conversion bushing (400) and is inserted into the straight stroke limiting groove (110) to form a sliding fit; the stroke conversion bushing (400) is provided with an S-shaped guide groove (420) arranged in a spiral shape along the circumference, and a first guide pin (320) is fixed on the insertion part (310) of the output shaft (300) and is inserted into the S-shaped guide groove (420) to form a sliding fit; the output shaft (300) is provided with an L-shaped guide groove (330), which is composed of a longitudinal groove arranged along the axial direction of the output shaft (300) and a transverse groove arranged along the circumference of the output shaft (300), and a second guide pin (120) is fixed on the inner wall of the bracket (100) and is inserted into the L-shaped guide groove (330) to form a sliding fit.

2. The transmission mechanism of the forced-sealing plug valve as described in claim 1, characterized in that: The top of the S-shaped guide groove (420) is located directly below the linear travel limiting groove (110) and directly above the second guide pin (120); when the first guide pin (320) slides to the bottom of the S-shaped guide groove (420), the bottom of the S-shaped guide groove (420) is aligned with the longitudinal groove of the L-shaped guide groove (330), and the second guide pin (120) slides to the end of the horizontal section of the L-shaped guide groove (330); when the first guide pin (320) slides to the top of the S-shaped guide groove (420), the top of the S-shaped guide groove (420) is aligned with the transverse groove of the L-shaped guide groove (330), and the second guide pin (120) slides into the longitudinal groove of the L-shaped guide groove (330).

3. The transmission mechanism of the forced-sealing plug valve as described in claim 1, characterized in that: The number of linear stroke limiting groove (110), linear stroke limiting pin (410), S-shaped guide groove (420), first guide pin (320), L-shaped guide groove (330) and second guide pin (120) is two each; the two linear stroke limiting grooves (110) and the two second guide pins (120) are symmetrically arranged with respect to the axis of the bracket (100), the two linear stroke limiting pins (410) and the two S-shaped guide grooves (420) are symmetrically arranged with respect to the axis of the stroke conversion bushing (400), and the two L-shaped guide grooves (330) and the two second guide pins (120) are symmetrically arranged with respect to the axis of the output shaft (300).

4. The transmission mechanism of the forced-sealing plug valve as described in claim 1, characterized in that: The actuator mating end of the input shaft (200) is provided with an external thread.

5. The transmission mechanism of the forced-sealing plug valve as described in claim 1, characterized in that: The top of the bracket (100) is the actuator connection end, and the bottom of the bracket (100) is the valve connection end; both the top and bottom of the bracket (100) are fixedly connected to a connecting plate, which has multiple connection holes.

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