Lift valve with adjustable stroke

Abstract

The utility model discloses a lift valve with adjustable stroke, and particularly relates to the technical field of lift valves, the lift valve comprises a support seat and a telescopic cylinder, a sliding bearing is mounted on a cylinder shaft at one end of the telescopic cylinder, a connecting rod is fixedly arranged at the bottom end of the sliding bearing, a rack is fixedly arranged at the bottom end of the connecting rod, and the rack is fixedly connected with the support seat. A gear is arranged at the lower end of the rack, a transmission shaft is fixedly arranged in the middle of the gear, a valve positioner is fixedly installed at one end of the supporting seat, and the end, away from the gear, of the transmission shaft is connected with the valve positioner. Straight stroke signals are converted into rotation signals to be fed back to the valve positioner, the valve positioner controls the air inlet direction and the air inlet amount after receiving the position signals, and therefore the air inlet amount of the front cavity and the rear cavity of the telescopic air cylinder is controlled, the telescopic amount of the telescopic air cylinder is controlled, the purpose of stepless stroke adjustment is achieved, the structure is simple, and operation is convenient. The installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of lift valves, in particular to a lift valve with adjustable stroke. Background Art

[0002] The switching device of RTO (regenerative thermal oxidizer) is a key component that affects its exhaust gas purification effect and the normal operation of the device. The main function of the switching device is to cyclically change the flow direction of the gas in a very short time, passing the exhaust gas to the hot regenerative chamber and exhausting the purified gas. The switching device of RTO is generally a lifting valve structure, which uses a 2-position 5-way solenoid valve to control the air intake direction and has only two switch positions. The lifting valve structure uses a straight-stroke cylinder, and there is no device to allow the cylinder to adjust the telescopic stroke. The closest solution is to use a 3-position 5-way solenoid valve and add an intermediate limit switch to allow the straight-stroke cylinder to stay in the middle position.

[0003] The existing 3-position, 5-way solenoid valve solution only adds one intermediate position to the poppet valve stroke, requires additional limit switches, is costly, and cannot achieve infinite stroke adjustment. Existing poppet valves controlled by solenoid valves only have two switch positions, while 3-position, 5-way solenoid valves only have one additional position. Utility Model Content

[0004] The purpose of the utility model is to provide a lift valve with adjustable stroke to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A lifting valve with adjustable stroke includes a support seat, a telescopic cylinder mounting seat is fixedly provided on the upper end of the support seat, a telescopic cylinder is fixedly provided on the telescopic cylinder mounting seat, a sliding bearing is installed on the cylinder shaft at one end of the telescopic cylinder, a connecting rod is fixedly provided at the bottom end of the sliding bearing, a rack is fixedly provided at the bottom end of the connecting rod, a gear is provided at the lower end of the rack, a transmission shaft is fixedly provided in the middle position of the gear, a valve positioner is fixedly provided on one end of the support seat, and the end of the transmission shaft away from the gear is connected to the valve positioner.

[0007] In a preferred embodiment, a protective cover is fixedly provided on the upper end of the support seat, and a handle is fixedly provided on the upper end of the protective cover. The setting of the protective cover can protect structures such as the telescopic cylinder, and the setting of the handle makes it convenient to take the protective cover.

[0008] In a preferred embodiment, the connecting rod is set as an L-shaped structure, and the gear is rotatably set on the inner wall of the support seat. The rack is installed using the connecting rod with an L-shaped structure, which facilitates the engagement of the rack with the gear.

[0009] In a preferred embodiment, the valve positioner is provided with an inlet and two outlets, and the two outlets are respectively connected to the air inlets at both ends of the telescopic cylinder. The rotation of the gear can drive the connecting shaft to rotate, and the rotation of the connecting shaft can enable the valve positioner to determine the stroke position of the telescopic cylinder.

[0010] In a preferred embodiment, the gear is a sector gear, and the gear is meshed with a rack.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The utility model discloses a lift valve with adjustable stroke, which is provided with a sliding bearing, a rack, a gear, a connecting shaft, a valve positioner and other structures. When the telescopic cylinder drives the sliding bearing to move, it can also drive the rack to move. The meshing of the rack and the gear converts the linear motion into rotational motion, and the linear stroke signal is converted into a rotation signal and fed back to the valve positioner. After receiving the position signal, the valve positioner controls the air intake direction and air intake amount of the valve positioner, thereby controlling the air intake amount of the front and rear cavities of the telescopic cylinder, thereby controlling the telescopic amount of the telescopic cylinder, and achieving the purpose of stepless stroke adjustment. The structure is simple and the installation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the utility model after the protective cover is removed;

[0015] Figure 3 This is a rear view structural diagram of the utility model with the protective cover removed;

[0016] Figure 4 For this utility model Figure 3 A magnified schematic diagram of the structure in the middle.

[0017] Numbers in the figure: 1. Support seat; 2. Telescopic cylinder mounting seat; 3. Telescopic cylinder; 4. Sliding bearing; 5. Connecting rod; 6. Rack; 7. Gear; 8. Drive shaft; 9. Valve positioner; 10. Protective cover; 11. Handle. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: See Figure 1 、 Figure 2 and Figure 4 The utility model provides a lift valve with adjustable stroke, and the technical solution is as follows:

[0020] A lifting valve with adjustable stroke includes a support seat 1, a telescopic cylinder mounting seat 2 is fixedly provided on the upper end of the support seat 1, a telescopic cylinder 3 is fixedly provided on the telescopic cylinder mounting seat 2, a sliding bearing 4 is installed on the cylinder shaft at one end of the telescopic cylinder 3, a connecting rod 5 is fixedly provided at the bottom end of the sliding bearing 4, a rack 6 is fixedly provided at the bottom end of the connecting rod 5, a gear 7 is provided at the lower end of the rack 6, a transmission shaft 8 is fixedly provided in the middle position of the gear 7, a valve positioner 9 is fixedly provided at one end of the support seat 1, and the end of the transmission shaft 8 away from the gear 7 is connected to the valve positioner 9.

[0021] In practice, a valve positioner is a key accessory for control valves, typically used in conjunction with pneumatic control valves. It receives the output signal from the regulator and uses it to control the pneumatic control valve. When the control valve is actuated, the displacement of the valve stem is fed back to the valve positioner through a mechanical device. The valve position status is then transmitted to the higher-level system via an electrical signal. The positioner uses the valve stem displacement signal as its input feedback measurement signal and the controller output signal as its setting signal for comparison. If there is a deviation between the two, the positioner changes its output signal to the actuator, actuating the actuator and establishing a one-to-one correspondence between the valve stem displacement and the controller output signal. Therefore, the valve positioner forms a feedback control system with valve stem displacement as the measurement signal and the controller output as the setting signal. The manipulated variable of this control system is the output signal from the valve positioner to the actuator. Valve positioners are commonly found in pneumatic butterfly valves and receive a rotational feedback signal.

[0022] In a preferred embodiment, a protective cover 10 is fixedly provided on the upper end of the support base 1, and a handle 11 is fixedly provided on the upper end of the protective cover 10. The setting of the protective cover 10 can protect structures such as the telescopic cylinder 3, and the setting of the handle 11 facilitates the removal of the protective cover 10.

[0023] In a preferred embodiment, the connecting rod 5 is configured as an L-shaped structure, and the gear 7 is rotatably disposed on the inner wall of the support base 1 .

[0024] In a preferred embodiment, the valve positioner 9 is provided with an inlet and two outlets, and the two outlets are respectively connected to the air inlets at both ends of the telescopic cylinder 3. The outlet of the valve positioner 9 and the air inlet of the telescopic cylinder 3 control the air intake volume of the front and rear cavities of the telescopic cylinder 3.

[0025] In a preferred embodiment, the gear 7 is a sector gear, and the gear 7 is meshed with the rack 6 . The meshing arrangement of the gear 7 and the rack 6 can convert the linear motion of the telescopic cylinder 3 into rotational motion and feed it back to the valve positioner 9 .

[0026] The working principle of this utility model:

[0027] When in use, open the telescopic cylinder 3. When the telescopic cylinder 3 is working, it can drive the sliding bearing 4 to move through the cylinder shaft. When the sliding bearing 4 moves, it can drive the rack 6 to make a linear motion through the connecting rod 5. When the rack 6 moves, the gear 7 can rotate. When the gear 7 rotates, it can be fed back to the valve positioner 9 through the connecting shaft 8. After receiving the feedback signal from the connecting shaft 8, the valve positioner 9 controls the air intake direction and air intake amount of the valve positioner 9. Since the two outlets on the valve positioner 9 are respectively connected to the air inlets at both ends of the telescopic cylinder 3, the air intake amount of the front and rear cavities of the telescopic cylinder 3 is controlled, the telescopic amount of the telescopic cylinder 3 is controlled, and the purpose of stepless adjustment of the stroke is achieved.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A lift valve with adjustable stroke, comprising a support seat (1), characterized in that: A telescopic cylinder mounting seat (2) is fixedly provided at the upper end of the support seat (1), a telescopic cylinder (3) is fixedly provided on the telescopic cylinder mounting seat (2), a sliding bearing (4) is installed on the cylinder shaft at one end of the telescopic cylinder (3), a connecting rod (5) is fixedly provided at the bottom end of the sliding bearing (4), a rack (6) is fixedly provided at the bottom end of the connecting rod (5), a gear (7) is provided at the lower end of the gear (6), a transmission shaft (8) is fixedly provided at the middle position of the gear (7), a valve positioner (9) is fixedly provided at one end of the support seat (1), and the end of the transmission shaft (8) away from the gear (7) is connected to the valve positioner (9).

2. The lift valve with adjustable stroke according to claim 1, characterized in that: A protective cover (10) is fixedly provided on the upper end of the support seat (1), and a handle (11) is fixedly provided on the upper end of the protective cover (10).

3. The lift valve with adjustable stroke according to claim 1, characterized in that: The connecting rod (5) is arranged in an L-shaped structure, and the gear (7) is rotatably arranged on the inner side wall of the support seat (1).

4. The lift valve with adjustable stroke according to claim 1, characterized in that: The valve positioner (9) is provided with an inlet and two outlets, and the two outlets are respectively connected to the air inlets at both ends of the telescopic cylinder (3).

5. The lift valve with adjustable stroke according to claim 4, characterized in that: The gear (7) is a sector gear, and the gear (7) is meshedly connected with the rack (6).

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