Limiting device for stroke rod

Abstract

The utility model discloses a limiting device for a stroke rod. The check valve comprises a valve body, a positioning ring is arranged in the valve body, and a valve element is arranged in the positioning ring in a sliding and penetrating mode. A stroke rod is arranged in the valve body and arranged in the valve element in a sliding and penetrating mode. The limiting component comprises a guide cylinder arranged at the end, away from the valve element, of the stroke rod, a first magnetic pole block is slidably arranged at one end of the guide cylinder, a second magnetic pole block is arranged at the other end of the guide cylinder, the second magnetic pole block is connected with an external circuit, the circuit is connected with an external control unit, and the magnetic pole of the first magnetic pole block and the magnetic pole of the second magnetic pole block repel each other. The first magnetic pole block is connected with the travel rod; according to the utility model, the repulsive force between the first magnetic pole block and the second magnetic pole block is adjusted by adjusting the current of the second magnetic pole block, so as to control the position of the second magnetic pole block, and further the distance between the valve core and the valve is controlled through the travel rod, so that the flow of a transfer medium in the valve body can be adjusted more flexibly; the applicability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to main steam valve stroke limiting technical field especially, it relates to a limiting device for stroke lever. BACKGROUND

[0002] The main steam valve is the key device for adjusting and controlling the steam flow into the steam turbine or boiler, and is commonly used in technical fields such as steam power system and thermal power plant.

[0003] In actual work, the main steam valve system usually controls the transmission operating force of the stroke lever to the valve core through hydraulic oil, gas pressure and other pressure transmission media, so as to realize the start-stop state of the valve core, but the existing stroke lever limiting method is usually to prevent the stroke lever from moving by inserting the mechanical stop block into the limiting slot reserved on the stroke lever, but this method is difficult to control the moving distance of the stroke lever, so it is difficult to flexibly adjust the flow in the main steam valve, and the applicability is limited.

[0004] Therefore, a limiting device for stroke lever is proposed, which can control the moving distance of the stroke lever to solve the above problems. INVENTION CONTENTS

[0005] The purpose of the utility model is to solve the above problems, and provide a limiting device for stroke lever, which can control the moving distance of the stroke lever.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme: a limiting device for stroke lever, comprising a valve body, a positioning ring is arranged in the valve body, a valve core is slidably arranged in the positioning ring, and the valve core is used to open or close the valve in the valve body;

[0007] A stroke lever is arranged in the valve body, and the stroke lever is slidably arranged in the valve core and used to drive the valve core to move;

[0008] A limiting component comprises a guide cylinder arranged at one end of the stroke lever away from the valve core, a first magnetic pole block is slidably arranged at one end of the guide cylinder close to the valve core, a second magnetic pole block is arranged at one end of the guide cylinder away from the valve core, the second magnetic pole block is connected with an external circuit, the circuit is signal connected with an external control unit, the control unit is used to control the on-off of the circuit, and the control unit inputs current to the second magnetic pole block through the circuit, the magnetic pole of the first magnetic pole block repels the magnetic pole of the second magnetic pole block, one end of the stroke lever extending out of the valve core extends into the guide cylinder and slidably passes through the second magnetic pole block, the first magnetic pole block is connected with the stroke lever, and the stroke lever is used to drive the first magnetic pole block to move towards the second magnetic pole block.

[0009] Further, the valve body is further provided with a separation sleeve, the separation sleeve is arranged on the side of the second magnetic pole block away from the valve body, a cavity is arranged in the separation sleeve, the stroke rod slides through the separation sleeve and communicates with the cavity, and the connection between the stroke rod and the separation sleeve is dynamic sealing connection.

[0010] The valve body is provided with a clamping component, the clamping component comprises two oppositely arranged telescopic rods arranged in the valve body, each telescopic rod is arranged on one side of the stroke rod, the telescopic end of each telescopic rod is slidingly inserted into the cavity, and the connection between each telescopic rod and the separation sleeve is dynamic sealing connection, the separation sleeve is further provided with two oppositely arranged clamping rings, and each clamping ring is arranged on the telescopic end corresponding to the telescopic rod, each telescopic rod is used to drive the corresponding clamping ring to move towards or away from the stroke rod, and each clamping ring clamps the stroke rod.

[0011] Further, at least two constraint grooves are arranged on the stroke rod in the length direction of the stroke rod, and each constraint groove is arranged on one side of the corresponding clamping ring.

[0012] Each clamping ring is further provided with a constraint plate on the clamping surface, each constraint plate corresponds to each constraint groove, when each clamping ring moves towards the stroke rod, each clamping ring drives the corresponding constraint plate to be inserted into the corresponding constraint groove.

[0013] Further, each telescopic rod is electrically connected with a circuit, and the circuit is a switching circuit, when the control unit sends a power supply signal to the second magnetic pole block through the circuit, the control unit simultaneously sends a power-off signal to each telescopic rod through the circuit, when the control unit sends a power-off signal to the second magnetic pole block through the circuit, the control unit simultaneously sends a power supply signal to each telescopic rod through the circuit, the control unit and the circuit are further provided with a delay unit, one end of the delay unit is signal connected with the control unit, and the other end is electrically connected with the circuit connected with the second magnetic pole block, when the delay unit receives the power-off signal sent by the control unit to the second magnetic pole block, the delay unit starts timing, and after timing is completed, the delay unit disconnects the circuit connected with the second magnetic pole block.

[0014] Further, the positioning ring is provided with an elastic unit, and the elastic unit is arranged between the positioning ring and the valve core, the elastic unit applies a pushing force to the valve core towards the valve direction.

[0015] Further, the positioning ring is provided with a detection unit near one end of the valve, the detection unit is used for detecting the flow size of the transmission medium in the valve body, the detection unit is signal connected with the control unit, the detection unit can detect the flow size of the transmission medium and send a signal to the control unit, so that the current of the second magnetic pole block is adjusted.

[0016] The beneficial effects of the utility model lie in:

[0017] The utility model discloses, through the current size of second magnetic pole block, thereby adjusting the repulsion size between first magnetic pole block and second magnetic pole block, to control the position of second magnetic pole block, and then through the distance between travel lever control valve core and valve, thereby can be more flexible to the flow of transmission medium in the valve body is adjusted, and the applicability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the perspective view of the travel lever limiting device of the utility model;

[0019] Figure 2 It is Figure 1 The enlarged view of A in the middle.

[0020] In the drawing:

[0021] 01, valve body;02, positioning ring;03, valve core;04, valve;1, travel lever;11, constraint groove;2, limiting component;21, guide cylinder;22, first magnetic pole block;23, second magnetic pole block;3, separation sleeve;31, cavity;4, clamping component;41, telescopic rod;42, clamping ring;43, constraint plate;5, elastic unit;6, detection unit. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. In the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] Please refer to Figures 1-2 The utility model discloses a travel lever limiting device, including valve body 01, the valve body 01 is equipped with positioning ring 02, the positioning ring 02 is equipped with valve core 03 and slides, the valve core 03 is used for opening or closing valve 04 in valve body 01 in the valve body 01;

[0024] In an embodiment, the valve body 01 is provided with a stroke rod 1, and the stroke rod 1 slides through the valve core 03 for driving the valve core 03 to move;

[0025] The limiting component 2 comprises a guide cylinder 21 arranged at the end of the stroke rod 1 away from the valve core 03, the end of the guide cylinder 21 close to the valve core 03 is slidably provided with a first magnetic pole block 22, and the end of the guide cylinder 21 away from the valve core 03 is provided with a second magnetic pole block 23, the second magnetic pole block 23 is connected with an external circuit (not shown in the figure), the circuit is signal connected with an external control unit (not shown in the figure), the control unit is used for controlling the on-off of the circuit, and the control unit inputs current to the second magnetic pole block 23 through the circuit, and the magnetic pole of the first magnetic pole block 22 repels the magnetic pole of the second magnetic pole block 23, the end of the stroke rod 1 extending out of the valve core 03 extends into the guide cylinder 21 and slides through the second magnetic pole block 23, the connection between the stroke rod 1 and the guide cylinder 21 is a dynamic sealing connection, and the first magnetic pole block 22 is connected with the stroke rod 1, and the stroke rod 1 is used for driving the first magnetic pole block 22 to move towards or away from the second magnetic pole block 23.

[0026] In specific implementation, when it is needed to open the valve 04, the transmission medium is input into the valve body 01 and exerts a pushing force on the stroke rod 1 away from the valve 04, so that the stroke rod 1 contacts the valve core 03 and drives the valve core 03 to move until the valve core 03 is separated from the valve 04, at this time, the valve body 01 is communicated, and the stroke rod 1 drives the first magnetic pole block 22 to move towards the second magnetic pole block 23, when it is needed to reduce the flow of the transmission medium in the valve body 01, the worker increases the current in the second magnetic pole block 23 through the control unit, at this time, the repulsive force between the first magnetic pole block 22 and the second magnetic pole block 23 is increased, the repulsive force pushes the first magnetic pole block 22 to move towards the valve 04, so that the stroke rod 1 drives the valve core 03 to move and reduces the distance between the valve core 03 and the valve 04 until the repulsive force and the force of the transmission medium are balanced, when it is needed to increase the flow of the transmission medium in the valve body 01, the repulsive force between the first magnetic pole block 22 and the second magnetic pole block 23 is reduced by reducing the current in the second magnetic pole block 23, under the pushing of the transmission medium, the first magnetic pole block 22 can continue to move towards the second magnetic pole block 23, so that the stroke rod 1 further drives the valve core 03 to open until the repulsive force and the force of the transmission medium are balanced again.

[0027] The utility model discloses, through adjusting the current size of second magnetic pole block 23, thereby to adjust the repulsive force size between first magnetic pole block 22 and second magnetic pole block 23, through the change of repulsive force drive second magnetic pole block 23 moves, to control the position of second magnetic pole block 23, further through stroke rod 1 control valve core 03 and valve 04 between the distance, thereby can be more flexible to the flow of transmission medium in valve body 01 is adjusted, improves the applicability.

[0028] It should be noted that the structure and function of the stroke rod 1 is the common knowledge of the workers in the field, and therefore it is not described in detail here.

[0029] It should be noted that the transmission medium is steam, oil and other media that can transmit pressure.

[0030] In an embodiment, the valve body 01 is also provided with a separation sleeve 3, which is arranged on the side of the second magnetic pole block 23 away from the valve body 01, and a cavity 31 is formed in the separation sleeve 3. The stroke rod 1 slides through the separation sleeve 3 and communicates with the cavity 31. The connection between the stroke rod 1 and the separation sleeve 3 is a dynamic seal connection.

[0031] The valve body 01 is provided with a clamping component 4, which includes two oppositely arranged telescopic rods 41 arranged in the valve body 01. Each telescopic rod 41 is arranged on one side of the stroke rod 1. The telescopic end of each telescopic rod 41 is slidingly inserted into the cavity 31. The connection between each telescopic rod 41 and the separation sleeve 3 is a dynamic seal connection. The separation sleeve 3 is also provided with two oppositely arranged clamping rings 42. Each clamping ring 42 is arranged on the telescopic end of the corresponding telescopic rod 41. Each telescopic rod 41 is used to drive the corresponding clamping ring 42 to move towards or away from the stroke rod 1, and make each clamping ring 42 clamp the stroke rod 1.

[0032] In this way, when the stroke rod 1 moves to a predetermined position, each telescopic rod 41 drives the corresponding clamping ring 42 to move towards the stroke rod 1 until the clamping ring 42 contacts the outer wall of the stroke rod 1 and exerts a clamping force on it towards the axis of the stroke rod 1, thereby clamping the stroke rod 1.

[0033] In an embodiment, at least two constraint grooves 11 are formed in the stroke rod 1 along the length direction of the stroke rod 1. Each constraint groove 11 is arranged on one side of the corresponding clamping ring 42.

[0034] A constraint plate 43 is arranged on the clamping surface of each clamping ring 42. Each constraint plate 43 corresponds to each constraint groove 11. When each clamping ring 42 moves towards the stroke rod 1, each clamping ring 42 drives the corresponding constraint plate 43 to be inserted into the corresponding constraint groove 11.

[0035] In this way, when each clamping ring 42 moves towards the stroke rod 1, each clamping ring 42 drives the corresponding constraint plate 43 to move towards the stroke rod 1 until each constraint plate 43 is inserted into the corresponding constraint groove 11. At this time, the side wall of each constraint plate 43 contacts the inner wall of the corresponding constraint groove 11, thereby increasing the contact area when the clamping ring 42 clamps the stroke rod 1, further improving the stability when the stroke rod 1 is clamped, and avoiding accidental movement of the stroke rod 1.

[0036] It should be noted that the surface of each constraint plate 43 has sufficient friction coefficient with the inner wall of each constraint groove 11, and each constraint plate 43 can provide sufficient friction force for the stroke rod 1 when the constraint plate 43 is inserted into the corresponding constraint groove 11.

[0037] In an embodiment, each telescopic rod 41 is electrically connected with the circuit, and the circuit is a switching circuit. When the control unit sends a power-off signal to the second magnetic pole block 23 through the circuit, the control unit simultaneously sends a power-on signal to each telescopic rod 41 through the circuit. When the control unit sends a power-off signal to the second magnetic pole block 23 through the circuit, the control unit simultaneously sends a power-on signal to each telescopic rod 41 through the circuit. The control unit and the circuit are further provided with a delay unit (not shown in the figure). One end of the delay unit is signal connected with the control unit, and the other end is electrically connected with the circuit connected with the second magnetic pole block 23. When the delay unit receives the power-off signal sent by the control unit to the second magnetic pole block 23, the delay unit starts timing. After timing is completed, the delay unit disconnects the circuit connected with the second magnetic pole block 23.

[0038] In this way, when it is necessary to clamp the stroke rod 1, the control unit sends a power-off signal to the second magnetic pole block 23 through the circuit, and sends a power-on signal to each telescopic rod 41. At this time, each telescopic rod 41 drives each constraint plate 43 to clamp the stroke rod 1, and at the same time, the delay unit receives the signal and starts timing. After each constraint plate 43 is completely inserted into the corresponding constraint groove 11, the delay unit timing is completed, and the second magnetic pole block 23 is powered off, thereby saving power consumption while ensuring that each constraint plate 43 stably clamps the stroke rod 1.

[0039] It should be noted that the structure and working principle of the switching circuit are well known to those skilled in the art, and therefore will not be described in detail here.

[0040] Preferably, the delay unit can adopt a delay switch in the prior art.

[0041] In an embodiment, the positioning ring 02 is provided with an elastic unit 5, and the elastic unit 5 is arranged between the positioning ring 02 and the valve core 03. The elastic unit 5 applies a pushing force to the valve core 03 in the direction close to the valve 04.

[0042] In this way, when the transmission medium drives the valve core 03 to move away from the valve 04, the elastic unit 5 is compressed. At this time, the valve 04 is opened. When there is no longer transmission medium flowing into the valve body 01, the elastic unit 5 loses constraint and drives the valve core 03 to move in the direction close to the valve 04 until the valve core 03 closes the valve 04.

[0043] In an embodiment, the positioning ring 02 is provided with a detection unit 6 near one end of the valve 04, the detection unit 6 is used for detecting the flow size of the transmission medium in the valve body 01, the detection unit 6 is signal connected with the control unit, the detection unit 6 can detect the flow size of the transmission medium and send a signal to the control unit, so as to adjust the current of the second magnetic pole block 23.

[0044] In this way, when it is needed to increase the flow in the valve body 01, the staff reduces the current output to the second magnetic pole block 23 through the control unit, at this time, the repulsion between the first magnetic pole block 22 and the second magnetic pole block 23 is weakened, the travel rod 1 drives the valve core 03 to move away from the valve 04, the flow in the valve body 01 is increased, when the detection unit 6 detects that the flow is increased to a predetermined value, the detection unit 6 sends a stop signal to the control unit, at this time, the control unit no longer changes the current output to the second magnetic pole block 23, the valve core 03 no longer moves, so that the valve core 03 can be more accurately adjusted.

[0045] It should be noted that if the embodiments of the utility model have directionality indications (such as up, down, left, right, front, back, etc.), the directionality indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directionality indications also change accordingly.

[0046] In addition, if the embodiments of the utility model have descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary technical personnel, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0047] In addition, "a plurality of" means two or more.

[0048] The above is only a preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A limiting device for a travel lever, characterized in that, The utility model provides a valve body (01) is equipped with the positioning ring (02) in it, the valve core (03) is slidably arranged in the positioning ring (02), and the valve core (03) is used for opening or closing the valve (04) in the valve body (01); The valve body (01) is equipped with a stroke rod (1), and the stroke rod (1) is slidably arranged in the valve core (03) and used to drive the valve core (03) to move; The limiting component (2) comprises a guide cylinder (21) arranged at one end of the stroke rod (1) away from the valve core (03), a first magnetic pole block (22) slidably arranged at one end of the guide cylinder (21) close to the valve core (03), and a second magnetic pole block (23) arranged at one end of the guide cylinder (21) away from the valve core (03), wherein the second magnetic pole block (23) is connected with an external circuit, the circuit is signal-connected with an external control unit, the control unit is used to control the on-off of the circuit, and the control unit inputs current to the second magnetic pole block (23) through the circuit, the magnetic pole of the first magnetic pole block (22) repels the magnetic pole of the second magnetic pole block (23), one end of the stroke rod (1) extending out of the valve core (03) is inserted into the guide cylinder (21) and slidably arranged through the second magnetic pole block (23), the first magnetic pole block (22) is connected with the stroke rod (1), and the stroke rod (1) is used to drive the first magnetic pole block (22) to move towards or away from the second magnetic pole block (23).

2. The position limiting device for a stroke rod according to claim 1, wherein: The valve body (01) is further equipped with a separation sleeve (3), the separation sleeve (3) is arranged at one side of the second magnetic pole block (23) away from the valve body (01), a cavity (31) is formed in the separation sleeve (3), the stroke rod (1) slidably arranged through the separation sleeve (3) is in communication with the cavity (31), and the connection between the stroke rod (1) and the separation sleeve (3) is a dynamic sealing connection; The valve body (01) is equipped with a clamping component (4), the clamping component (4) comprises two opposite telescopic rods (41) arranged in the valve body (01), each telescopic rod (41) is arranged at one side of the stroke rod (1), the telescopic end of each telescopic rod (41) is slidably arranged in the cavity (31), the connection between each telescopic rod (41) and the separation sleeve (3) is a dynamic sealing connection, the separation sleeve (3) is further equipped with two opposite clamping rings (42), each clamping ring (42) is arranged on the telescopic end of the corresponding telescopic rod (41), each telescopic rod (41) is used to drive the corresponding clamping ring (42) to move towards or away from the stroke rod (1), and each clamping ring (42) clamps the stroke rod (1).

3. The position limiting device for a stroke rod according to claim 2, wherein: At least two constraint grooves (11) are formed in the stroke rod (1) and arranged along the length direction of the stroke rod (1), and each constraint groove (11) is arranged at one side of the corresponding clamping ring (42). The clamping surface of each clamping ring (42) is also provided with a constraint plate (43), each constraint plate (43) corresponds to each constraint groove (11), when each clamping ring (42) moves towards the direction of the stroke rod (1), each clamping ring (42) drives the corresponding constraint plate (43) to be inserted into the corresponding constraint groove (11).

4. The position limiting device for a stroke rod according to claim 2, wherein: Each telescopic rod (41) is electrically connected with the circuit, and the circuit is a switching circuit, when the control unit sends a power supply signal to the second magnetic pole block (23) through the circuit, the control unit simultaneously sends a power-off signal to each telescopic rod (41) through the circuit, when the control unit sends a power-off signal to the second magnetic pole block (23) through the circuit, the control unit simultaneously sends a power supply signal to each telescopic rod (41) through the circuit, the control unit and the circuit are also provided with a delay unit, one end of the delay unit is signal connected with the control unit, and the other end is electrically connected with the circuit connected with the second magnetic pole block (23), when the delay unit receives the power-off signal sent by the control unit to the second magnetic pole block (23), the delay unit starts timing, until the timing is completed, the delay unit disconnects the circuit connected with the second magnetic pole block (23).

5. The position limiting device for a stroke rod according to claim 1, wherein: The positioning ring (02) is provided with an elastic unit (5), and the elastic unit (5) is arranged between the positioning ring (02) and the valve core (03), and the elastic unit (5) applies a pushing force to the valve core (03) in the direction of the valve (04).

6. The position limiting device for a stroke rod according to claim 5, wherein: The end of the positioning ring (02) close to the valve (04) is provided with a detection unit (6), the detection unit (6) is used for detecting the flow size of the transmission medium in the valve body (01), the detection unit (6) is signal connected with the control unit, the detection unit (6) can detect the flow size of the transmission medium and send a signal to the control unit, so as to adjust the current of the second magnetic pole block (23).

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