Valve mechanical linkage system

Abstract

Disclosed is a valve mechanical linkage system. A valve comprises a main valve and a secondary valve; the system comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected with the main valve and used for converting the up-and-down reciprocating motion of the main valve into a rotational reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by means of a coupling (4), and the rotational force of the rotational reciprocating motion is transferred to the second transmission mechanism by means of the coupling (4); the second transmission mechanism is connected with the secondary valve, and achieves on-off control on the secondary valve by converting the rotational reciprocating motion into the up-and-down reciprocating motion.

Claims

1. A mechanical linkage system for valves, the valves comprising a main valve and an auxiliary valve, wherein the system comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected to the main valve, and is configured to convert up-down reciprocating motion of the main valve into rotary reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by a coupling, and a rotary force of the rotary reciprocating motion is transferred to the second transmission mechanism through the coupling; and the second transmission mechanism is connected with the auxiliary valve, and control of opening and closing of the auxiliary valve is achieved by converting the rotary reciprocating motion into the up-down reciprocating motion; the second transmission mechanism is a cam, and the cam is fixedly connected to a bracket of the auxiliary valve, a groove is provided on the cam, and a protruding roller on a moving assembly of the auxiliary valve is embedded in the groove to achieve up-down reciprocating motion of the moving assembly of the auxiliary valve along with rotation of the cam.

2. The mechanical linkage system for valves according to claim 1, wherein the first transmission mechanism is a rack-and-gear structure.

3. The mechanical linkage system for valves according to claim 2, wherein a rack in the rack-and-gear structure is a driving member mounted on a moving assembly of the main valve, and a gear in the rack-and-gear structure is a follower mounted on a bracket of the main valve.

4. The mechanical linkage system for valves according to claim 1, wherein the groove is configured to meet a stroke cooperation relationship between the main valve and the auxiliary valve.

5. The mechanical linkage system for valves according to claim 4, wherein the groove comprises an arc segment, a straight segment and/or a curved segment connected end to end, a radius of the arc segment is constant, and in a case that the protruding roller of the moving assembly of the auxiliary valve moves in the arc segment, the moving assemblies of the main valve and the auxiliary valve remain unchanged.

6. The mechanical linkage system for valves according to claim 1, wherein the coupling is a flexible coupling.

7. The mechanical linkage system for valves according to claim 6, wherein the flexible coupling is one of the following structures: a universal joint structure, a cross slide-block, a toothed coupling, and a coupling with an elastic element.

8. The mechanical linkage system for valves according to claim 1, wherein a valve body of the main valve is a valve body of a cracking gas valve, a bracket of the main valve is a bracket of the cracking gas valve, and a moving assembly of the main valve is a valve core and a valve stem of the cracking gas valve.

9. The mechanical linkage system for valves according to claim 1, wherein a driving mode of an actuator of the main valve is one of pneumatic, hydraulic, electric and manual.

10. The mechanical linkage system for valves according to claim 1, wherein a bracket of the auxiliary valve is a bracket of a decoking valve, and a moving assembly of the auxiliary valve is a valve core and a valve stem of the decoking valve.

11. The mechanical linkage system for valves according to claim 1, wherein the valves are special valves applied in energy chemical industry.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural view of an embodiment according to the present disclosure;

(2) FIG. 2 is a schematic view of a rack-and-gear mechanism according to the present disclosure;

(3) FIG. 3 is a schematic view of a flexible coupling mechanism according to the present disclosure; and

(4) FIG. 4 is a schematic view of a cam mechanism according to the present disclosure.

REFERENCE NUMERALS

(5) TABLE-US-00001 1 gear, 2 rack, 3 cam, 4 flexible coupling, 5 main valve body, 6 main valve bracket, 7 main valve actuator, 8 main valve moving assembly, 9 main valve coupling, 10 auxiliary valve body, 11 auxiliary valve bracket, 12 auxiliary valve moving assembly.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) The technical solutions according to the present application are described in detail in conjunction with drawings and specific embodiments.

(7) A mechanical linkage system for valves is provided according to the present disclosure, which is particularly suitable for special valves applied in the energy chemical industry. A main valve and an auxiliary valve are mechanically linked in the system to achieve specific opening-closing cooperation actions according to use requirements. Specifically, the mechanical linkage system for valves includes a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected to the main valve for converting up-down reciprocating motion of the main valve into rotary reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by a coupling, and a rotary force of the rotary reciprocating motion is transferred to the second transmission mechanism through the coupling; and the second transmission mechanism is connected with the auxiliary valve, and control of opening and closing of the auxiliary valve is achieved by converting the rotary reciprocating motion into the up-down reciprocating motion. In order to compensate all-around errors while ensuring smooth transmission and avoiding the influence of pipeline stress, a coupling in the present disclosure is a flexible coupling.

(8) The first transmission mechanism and the second transmission mechanism may be any mechanical structure that satisfies the above functional requirements. In the present embodiment, a rack-and-gear structure and a cam structure are preferably provided.

(9) A rack in the rack-and-gear structure is a driving member mounted on a moving assembly of the main valve; and the gear is a follower mounted on a bracket of the main valve. A cam is fixedly connected to a bracket of the auxiliary valve, and a groove is provided on the cam. The groove is in cooperation with a protruding roller on a moving assembly of the auxiliary valve to achieve up-down reciprocating motion of the moving assembly of the auxiliary valve along with rotation of the cam.

(10) The groove is configured to meet a stroke cooperation relationship between the main valve and the auxiliary valve. Specifically, the groove may be provided as a free combination of an arc and a straight line or a curved line according to actual requirements or calculation results, and the proportion of each part constituting the groove may be arbitrarily combined according to the calculation results. When the roller of the moving assembly of the auxiliary valve is in the arc part of the groove, the moving assembly of the auxiliary valve remains unchanged during the movement of the main valve; and when the roller of the moving assembly of the auxiliary valve is in the remaining part, the moving assembly of the auxiliary valve moves up and down as the shape of the groove changes, thereby achieving the design intention, that is, changing the stroke position of the auxiliary valve at any time along with the movement of the main valve.

(11) The following embodiment is provided according to the present disclosure.

(12) As shown in FIG. 1, a mechanical linkage system for valves provided according to the present disclosure includes a gear 1, a rack 2, a cam 3, a flexible coupling 4, a main valve body 5, a main valve bracket 6, a main valve actuator 7, a main valve moving assembly 8, a main valve coupling 9, an auxiliary valve body 10, an auxiliary valve bracket 11, and an auxiliary valve moving assembly 12.

1. Main Valve

(13) A drive structure of rack-and-gear is adopted in the main valve, where the mail valve actuator 7, the main valve body 5, and the gear 1 are respectively fixedly connected to the main valve bracket 6.

(14) As shown in FIG. 2, the gear 1 is a follower in the cooperation of the rack-and-gear structure, which is mounted on the main valve bracket 6, is in cooperation with the rack 2, and is fixedly connected to the flexible coupling 4 to drive the cam 3 to rotate.

(15) The rack 2 is a driving member in the cooperation of the rack-and-gear structure, which is mounted on the main valve coupling 9, and reciprocates under the drive of the main valve moving assembly 8 to drive the gear 1 to reciprocate.

(16) The rack 2 drives the gear 1 to perform reciprocating rotation.

(17) As shown in FIG. 3, the main valve and the auxiliary valve are connected by the flexible coupling 4, and a rotary force of the gear 1 in the main valve is transferred to the cam 3 of the auxiliary valve through the flexible coupling 4 to finally drive the auxiliary valve to be opened or closed, thereby controlling an opening degree of the auxiliary valve.

(18) In the present embodiment, the flexible coupling 4 is one of the following structures: a universal joint structure, a cross slide-block, a toothed coupling, and a coupling with an elastic element.

(19) The main valve actuator 7 is configured to drive the main valve moving assembly 8 to move; and in the present embodiment, a driving mode of the main valve actuator 7 is one of pneumatic, hydraulic, electric and manual.

(20) The main valve moving assembly 8 is fixedly connected to the main valve coupling 9 and is driven by the main valve actuator 7 to move up and down in a straight stroke-direction of the main valve, and drives the rack 2 to perform linear reciprocating motion.

(21) The main valve coupling 9 is fixedly connected to the main valve moving assembly 8 and the rack 2, and moves along with the main valve moving assembly 8.

(22) In the present embodiment, the main valve body 5 is a valve body of a cracking gas valve, the main valve bracket 6 is a bracket of the cracking gas valve, and the main valve moving assembly 8 is a valve core and a valve stem of the cracking gas valve.

2. Auxiliary Valve

(23) The auxiliary valve is driven by the cam 3, and the cam 3 is fixedly connected to the auxiliary valve bracket 11 for reciprocating rotation.

(24) The cam 3 is fixedly connected to the flexible coupling 4, and rotates along with the rotation of the gear 1, and a groove is provided on an upper portion of the cam according to a stroke cooperation relationship between the main valve and the auxiliary valve.

(25) As shown in FIG. 4, the auxiliary valve moving assembly 12 includes a protruding roller, and the roller is embedded in the groove of the cam 3. The auxiliary valve moving assembly 12 reciprocates up and down along with the rotation of the cam 3.

(26) The auxiliary valve bracket 11 is connected to the cam 3, the auxiliary valve body 10 is fixedly connected to the auxiliary valve bracket 11, and the cam 3 is fixedly connected to the flexible coupling 4.

(27) The transmission roller in the auxiliary valve moving assembly 12 moves in the groove provided in the cam 3 under the drive of the cam 3, and drives the auxiliary valve moving assembly 12 to move up and down in the auxiliary valve body 10 along with the reciprocating rotation of the cam 3, to achieve the opening and closing of the auxiliary valve.

(28) In the present embodiment, the auxiliary valve bracket 11 is a bracket of a decoking valve and the auxiliary valve moving assembly 12 is a valve spool and valve stem of the decoking valve.

(29) During the working process, the main valve is first in a fully open position, and the auxiliary valve is in a fully closed position; Then the main valve is moved to a closed position under the drive of the actuator, and although the cam 3 is already rotating, a radius of the effective groove keeps unchanged at this stage, so the position of the auxiliary valve does not change.