Self-locking pneumatic valve

Abstract

The utility model discloses a self-locking pneumatic valve which comprises a pneumatic actuator and a valve body which are connected, the valve body comprises a valve rod, the pneumatic actuator is in transmission connection with the valve body through the valve rod, the pneumatic actuator comprises a cylinder body, a rack and an electromagnet, a cavity is formed in the cylinder body, the rack is arranged in the cavity of the cylinder body in a sliding mode, and the electromagnet is arranged in the cavity of the cylinder body. A plurality of tooth parts which are evenly distributed at intervals are arranged on one side of the rack, a plurality of groove parts which are evenly distributed at intervals are arranged on the other side of the rack, the end, away from the valve, of the valve rod is matched with the tooth parts, and one end of the electromagnet is matched with the groove parts. According to the self-locking type pneumatic valve, the rack is arranged, the multiple tooth parts matched with one end of the valve rod and the multiple groove parts matched with one end of the electromagnet are arranged on the two sides of the rack respectively, and then the electromagnet is powered on and powered off to control movement of the rack so as to control rotation of the valve rod; the pneumatic valve can be locked at multiple positions except the opening position and the closing position.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a self-locking pneumatic valve. Background Art

[0002] In industrial production, especially in water supply and heating, manufacturing and chemical industries, pneumatic actuators are widely used. They can use the power of compressed air to drive and control valves.

[0003] In the prior art, for example, a Chinese utility model application with patent application number 202320148511.2 discloses a self-locking pneumatic butterfly valve, which uses a limit sleeve to align with a limit block to achieve limiting, so that the butterfly valve can be locked as needed after opening and closing. Although the technical solution disclosed in the patent can achieve self-locking, it can only be locked when the valve core is closed or fully opened, which is inconvenient to use. Utility Model Content

[0004] In view of this, in order to overcome the defects of the prior art, the purpose of the utility model is to provide an improved self-locking pneumatic valve, which can lock multiple working positions of the pneumatic valve and is easy to operate.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A self-locking pneumatic valve, comprising a pneumatic actuator and a valve connected to each other, the valve comprising a valve stem, the pneumatic actuator and the valve being transmission-connected via the valve stem, the pneumatic actuator comprising a cylinder, a rack and an electromagnet, the cylinder having a cavity inside, the rack being slidably disposed in the cavity of the cylinder, a plurality of teeth evenly spaced and distributed on one side of the rack, a plurality of grooves evenly spaced and distributed on the other side of the rack, an end of the valve stem away from the valve being matched with the teeth, and an end of the electromagnet being matched with the groove;

[0007] The self-locking pneumatic valve has a locking state and an unlocking state. When the self-locking pneumatic valve is in the locking state, one end of the electromagnet close to the rack is accommodated in the groove; when the self-locking pneumatic valve is in the unlocking state, one end of the electromagnet close to the rack is located outside the groove.

[0008] According to some preferred implementation aspects of the utility model, a gear portion is provided at one end of the valve stem away from the valve, and the gear portion meshes with the teeth of the rack. The gear portion of the valve stem meshes with the teeth of the rack to achieve transmission, and the movement of the rack drives the gear portion to rotate, thereby driving the valve stem to rotate.

[0009] According to some preferred implementation aspects of the utility model, the electromagnet includes an armature, and an extension shaft is fixedly provided at one end of the armature close to the rack, and when the self-locking pneumatic valve is in the locked state, the outer wall of the extension shaft abuts against the inner wall of the groove. When the extension shaft is accommodated in the groove of the rack, the rack is locked in the current position because it cannot move further, and the gear part cannot continue to rotate, so the valve stem stops rotating, so that the pneumatic valve is also locked in the current position.

[0010] According to some preferred implementation aspects of the utility model, the cylinder body includes a first part and a second part symmetrically arranged at both ends of the first part, the first part and the second part both have a cavity, the electromagnet is accommodated in the cavity of the first part, and the rack is accommodated in the cavity of the first part and the second part.

[0011] According to some preferred implementation aspects of the utility model, pistons are fixedly provided at both ends of the rack, and the pistons are accommodated in the cavity of the second part. The outer wall of each piston is sleeved with a sealing ring, and the outer wall of the sealing ring abuts against the inner wall of the second part; the piston includes a base and an extension located at one end of the base away from the first part, the axis of the base coincides with the axis of the extension, and the outer diameter of the extension is smaller than the outer diameter of the base. The setting of the sealing ring can be used to ensure the sealing of the second cavity. When the piston makes a linear reciprocating motion in the cylinder body, the sealing ring will tightly abut against the inner wall of the cylinder body to form a reliable seal. This sealing structure can effectively prevent the compressed gas in the second cavity from leaking out, ensuring the normal operation of the piston. At the same time, selecting a sealing ring with less friction can also reduce the friction resistance between the piston and the cylinder body.

[0012] According to some preferred implementation aspects of the utility model, the ends of the two pistons close to each other, the inner wall of the first part and the inner wall of the end of the second part close to the first part enclose a first cavity; each of the second parts is provided with a through hole that penetrates the outer wall and the inner wall of the second part, and the through hole is connected to the first cavity. In some embodiments of the utility model, the first cavity acts as a normal pressure air cavity, and by connecting the through hole with the first cavity, it can be used to discharge the residual air or other medium in the first cavity, so that the air pressure in the first cavity remains the same as the external air pressure, which is conducive to improving the efficiency of introducing or discharging gas into the second cavity to drive the piston to move and drive the rack to move.

[0013] According to some preferred implementation aspects of the utility model, an end cap is fixedly provided at one end of each second part away from the first part, and a second cavity is enclosed between the end of the end cap close to the first part, the inner wall of the second part, and the end of the piston away from the first part. In some embodiments of the utility model, two pistons are respectively fixedly connected to the two ends of the rack, and the two pistons are pushed to move simultaneously by inhaling and exhaling air into the enclosed second cavity, thereby driving the rack to move linearly, and finally driving the valve stem to rotate.

[0014] According to some preferred implementation aspects of the utility model, two guide blocks are arranged in parallel at one end of each end cap close to the first part, and a limit block is arranged on the side where the two guide blocks are close to each other, one end of the limit block is fixedly connected to one side of one guide block, and the other end of the limit block extends in the direction close to the other guide block, and the guide block is parallel to the extension part; the distance between the two guide blocks is greater than the outer diameter of the extension part and smaller than the outer diameter of the base, the length of the limit block is greater than the distance from the side of the guide block close to the limit block to the outer wall of the extension part, and the distance from the limit block to the end of the guide block close to the base is less than the length of the extension part. The setting of the guide block can guide the movement of the piston and the rack to avoid deviation. The setting of the limit block is to limit the movement stroke of the rack in the cylinder body to avoid damage to the device caused by excessive movement of the rack; when the rack moves to the limit position (i.e., the position of the rack corresponding to the valve core of the pneumatic valve is in a closed or fully open state), the end of the extension part of the piston will abut against the limit block, thereby limiting the excessive movement of the rack. In addition, the distance from the limit block to the end of the guide block close to the base is set to be smaller than the length of the extension part in order to ensure that when the limit block abuts against the end of the extension part of the piston, the end of the base of the piston and the end of the guide block do not contact each other, thereby avoiding a hard collision between the two and damaging the parts.

[0015] In some other embodiments of the present invention, an elastic limiting mechanism may also be used, such as a buffer spring, to provide appropriate resistance to the rack at the extreme position of the rack to limit the movement of the rack.

[0016] According to some preferred implementation aspects of the utility model, each of the end covers is provided with a first channel and a second channel, both of the first channel and the second channel are connected to the second cavity, one of the first channel and the second channel is used to introduce gas into the second cavity, and the other of the first channel and the second channel is used to discharge the gas in the second cavity to the outside.

[0017] According to some preferred implementation aspects of the utility model, it also includes an indicator fixedly arranged on the cylinder body, the indicator is electrically connected to the electromagnet, and the indicator is used to indicate the locking state and unlocking state of the self-locking pneumatic valve. In some embodiments of the utility model, the indicator is connected in series with the electromagnet in the power supply circuit. The function of the indicator is to intuitively display the current state of the pneumatic valve. For example, when the electromagnet is powered off and the extension shaft is accommodated in the groove of the rack and abuts against it, the pneumatic valve is in a locked state at this time, and the indicator is off at this time, indicating that the locking has taken effect. On the contrary, when the electromagnet is powered on and the extension shaft is separated from the groove of the rack, the pneumatic valve is unlocked, and the indicator lights up, indicating that the rack can move freely. Through the bright and dim state of the indicator, the operator can clearly and intuitively judge the current working state of the pneumatic valve, which is conducive to correct operation and fault diagnosis. On the contrary, in some other embodiments, the indicator can also be set to light up when the pneumatic valve is in a locked state and extinguish when the pneumatic valve is in a loose state.

[0018] Due to the adoption of the above technical scheme, compared with the prior art, a self-locking pneumatic valve of the utility model is provided, by providing a rack and respectively providing a plurality of teeth portions cooperating with one end of the valve stem and a plurality of groove portions cooperating with one end of the electromagnet on both sides of the rack, and then controlling the movement of the rack by energizing and de-energizing the electromagnet to control the rotation of the valve stem, ultimately enabling the pneumatic valve of the utility model to be locked in a plurality of positions other than the open and closed positions, thereby improving the convenience of operating the pneumatic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a three-dimensional structural diagram of a self-locking pneumatic valve in a preferred embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of a valve in a preferred embodiment of the utility model;

[0022] Figure 3 This is a schematic cross-sectional view of a self-locking pneumatic valve in a preferred embodiment of the utility model;

[0023] Figure 4 for Figure 3 A partial enlarged view of the middle A part;

[0024] In the accompanying drawings: pneumatic actuator-1, first part-111, second part-112, through hole-1121, rack-12, tooth part-121, groove part-122, electromagnet-13, armature-131, extension shaft-132, piston-14, base-141, extension part-142, sealing ring-15, first cavity-16, second cavity-17, end cover-18, guide block-181, limit block-182, first channel-183, second channel-184, connecting flange-19, valve-2, valve stem-21, gear part-211, valve body-22, connecting part-221. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] Reference Figures 1 to 4 A self-locking pneumatic valve of this embodiment includes a pneumatic actuator 1 and a valve 2, wherein the pneumatic actuator 1 is in transmission connection with the valve 2. The valve 2 includes a valve stem 21 and a valve body 22, wherein a gear portion 211 is disposed at one end of the valve stem 21, an end of the valve stem 21 away from the gear portion 211 is located inside the valve body 22, and the other end of the valve stem 21 provided with the gear portion 211 is located outside the valve body 22; a connecting portion 221 is fixedly disposed at the top end of the valve body 22.

[0027] Further, refer to Figure 1 and Figure 3 The pneumatic actuator 1 includes a cylinder body, a rack 12, an electromagnet 13 and an end cover 18. The cylinder body includes a first portion 111 and a second portion 112 symmetrically arranged at both ends of the first portion 111. A connecting flange 19 is arranged at the bottom of the first portion 111 for connecting with a connecting portion 221 of a valve body 22 to fix the cylinder body and the valve body 22.

[0028] The first part 111 and the second part 112 both have a cavity, and the electromagnet 13 is accommodated in the cavity of the first part 111; the rack 12 is accommodated in the cavity of the first part 111 and the second part 112, and the rack 12 can slide along the length direction of the cylinder body.

[0029] like Figure 3As shown, one side of the rack 12 is provided with a plurality of teeth 121 evenly spaced, and the other side of the rack 12 is provided with a plurality of grooves 122 evenly spaced. The gear portion 211 of the valve stem 21 meshes with the teeth 121 of the rack 12, and the rack 12 transmits the valve stem 21 through the cooperation between the two. The electromagnet 13 is provided with a side of the groove 122 near the rack 12, and the electromagnet 13 includes an armature 131. An extension shaft 132 is fixedly provided at one end of the armature 131 near the rack 12, and the groove 122 of the rack 12 is used to accommodate the extension shaft 132. Figure 4 As shown, when the electromagnet 13 is powered off, the armature 131 extends outward, driving the extension shaft 132 to extend outward, and then accommodated in the groove 122 of the rack 12, and the outer wall of the extension shaft 132 abuts against the inner wall of the groove 122 to prevent the rack 12 from moving, so that the valve stem 21 stops rotating, and the pneumatic valve is in a locked state; when the electromagnet 13 is powered on, the armature 131 retracts inward, driving the extension shaft 132 to retract inward, so that the extension shaft 132 is disengaged from the groove 122 of the rack 12, and the rack 12 is moved, so that the valve stem 21 can rotate, and the lock is released at this time, so that the pneumatic valve is in an unlocked state. In this embodiment, since the rack 12 is provided with a plurality of evenly spaced grooves 122, the plurality of grooves 122 restrict the extension shaft 132, so that the rack 12 can stop moving at multiple positions, so that the valve stem 21 can stop rotating at multiple positions.

[0030] Pistons 14 are fixedly provided at both ends of the rack 12. Each piston 14 is respectively accommodated in the corresponding cavity of the second part 112. The piston 14 includes a base 141 and an extension part 142 located at one end of the base 141 away from the first part 111. The axis line of the base 141 coincides with the axis line of the extension part 142, and the outer diameter of the extension part 142 is smaller than the outer diameter of the base 141. Specifically, the first cavity 16 is formed between the ends of the two pistons 14 that are close to each other, the inner wall of the first part 111, and the inner wall of the end of the second part 112 that is close to the first part 111; each second part 112 is provided with a through hole 1121 that passes through the outer wall and the inner wall of the second part 112, and the through hole 1121 is connected with the first cavity 16, so that the function of the first cavity 16 is equivalent to that of a normal pressure air cavity. By connecting the through hole 1121 with the first cavity 16, it can be used to discharge residual air or other media inside the first cavity 16, so that the air pressure in the first cavity 16 remains the same as the external air pressure.

[0031] An end cap 18 for sealing the cylinder is fixedly provided at one end of the second part 112 of the cylinder body away from the first part 111. The end of the end cap 18 close to the first part 111, the inner wall of the second part 112 and the end of the piston 14 away from the first part 111 enclose a second cavity 17. By introducing and discharging gas into and out of the second cavity 17 to push the two pistons 14 to move simultaneously, the rack 12 can be driven to move linearly, thereby driving the valve stem 21 to rotate. In order to ensure the sealing of the second cavity 17, a sealing ring 15 is sleeved on the outer wall of each piston 14, and the outer wall of the sealing ring 15 abuts against the inner wall of the second part 112. When the piston 14 performs linear reciprocating motion in the cylinder body, the sealing ring 15 will closely abut against the inner wall of the cylinder body to form a reliable seal, so as to effectively prevent the compressed gas in the second cavity 17 from leaking out and ensure the normal operation of the piston 14. In addition, since the first cavity 16 is connected to the through hole 1121, it is beneficial to improve the efficiency of introducing or exhausting gas into the second cavity 17 to drive the piston 14 to move and drive the rack 12 to move, thereby ensuring the smooth operation of the piston 14.

[0032] Each end cover 18 is provided with a first channel 183 and a second channel 184, both of which are connected to the second cavity 17. In this embodiment, the first channel 183 is used to introduce compressed gas into the second cavity 17, and the second channel 184 is used to discharge the compressed gas in the second cavity 17 to the outside.

[0033] Furthermore, if Figure 3 As shown, two guide blocks 181 are arranged in parallel at one end of each end cover 18 close to the first part 111, and the guide blocks 181 are parallel to the extension part 142; a limit block 182 is arranged on the side close to each other of the two guide blocks 181, one end of the limit block 182 is fixedly connected to one side of one guide block 181, and the other end of the limit block 182 extends in the direction close to the other guide block 181. The distance between the two guide blocks 181 is greater than the outer diameter of the extension part 142 of the piston 14 and smaller than the outer diameter of the base 141 of the piston 14; the length of the limit block 182 is greater than the distance from the side of the guide block 181 close to the limit block 182 to the outer wall of the extension part 142, so as to ensure that the limit block 182 can effectively abut against the extension part 142 of the piston 14 when the rack 12 moves to the limit position, thereby limiting the excessive movement of the rack 12. In addition, the distance from the limit block 182 to the end of the guide block 181 close to the base 141 is less than the length of the extension portion 142, ensuring that when the limit block 182 abuts against the end of the extension portion 142 of the piston 14, the end of the base 141 of the piston 14 and the end of the guide block 181 do not contact each other, thereby avoiding a hard collision between the two and damaging the parts.

[0034] Furthermore, the self-locking pneumatic valve of this embodiment also includes an indicator (not shown) fixedly arranged on the cylinder body, the indicator is connected in series with the electromagnet 13 in the power supply circuit, and the indicator is used to indicate the locking state and unlocking state of the self-locking pneumatic valve. In this embodiment, when the pneumatic valve is in the locked state, the indicator goes out, indicating that the locking has taken effect; conversely, when the pneumatic valve is in the unlocked state, the indicator lights up, indicating that the rack 12 can move freely. Through the on and off state of the indicator, the operator can clearly and intuitively judge the current working state of the pneumatic valve, which is conducive to correct operation and fault diagnosis.

[0035] The working process of the self-locking pneumatic valve of the utility model is as follows:

[0036] When the pneumatic valve is started, the electromagnet 13 is first powered on to operate, and the extension shaft 132 is separated from the groove 122 of the rack 12, releasing the lock on the rack 12. Then, the first channel 183 on the end cover 18 on one side of the cylinder body is opened, and the second channel 184 is closed, while the first channel 183 on the end cover 18 on the other side of the cylinder body is closed, and the second channel 184 is opened. The compressed gas enters the second cavity 17 on one side from the first channel 183 on the end cover 18 on one side of the cylinder body, and drives the rack 12 to move linearly by pushing the piston 14 to move. When the rack 12 reaches the predetermined position of the valve stem 21 that needs to be locked, the electromagnet 13 is powered off, and the extension shaft 132 is reinserted into the groove 122 of the rack 12 to achieve the locking of the position of the rack 12. At the same time, the first channels 183 on the end covers 18 on both sides of the cylinder body are closed, and the second channels 184 are opened. At this time, there is no need to maintain the air pressure in the second cavity 17, which improves the safety and work efficiency of the pneumatic valve and effectively avoids accidental movement of the pneumatic valve.

[0037] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A self-locking pneumatic valve, comprising a pneumatic actuator and a valve connected to each other, wherein the valve comprises a valve stem, and the pneumatic actuator and the valve are connected to each other by the valve stem, characterized in that: The pneumatic actuator comprises a cylinder, a rack and an electromagnet, wherein the cylinder has a cavity inside, the rack is slidably arranged in the cavity of the cylinder, one side of the rack is provided with a plurality of teeth evenly spaced, the other side of the rack is provided with a plurality of grooves evenly spaced, one end of the valve stem away from the valve is matched with the teeth, and one end of the electromagnet is matched with the groove; The self-locking pneumatic valve has a locking state and an unlocking state. When the self-locking pneumatic valve is in the locking state, one end of the electromagnet close to the rack is accommodated in the groove; when the self-locking pneumatic valve is in the unlocking state, one end of the electromagnet close to the rack is located outside the groove.

2. The self-locking pneumatic valve according to claim 1, characterized in that: A gear portion is disposed at one end of the valve stem away from the valve, and the gear portion is meshed with the toothed portion of the rack.

3. The self-locking pneumatic valve according to claim 1, characterized in that: The electromagnet comprises an armature, and an extension shaft is fixedly provided at one end of the armature close to the rack. When the self-locking pneumatic valve is in the locking state, the outer wall of the extension shaft abuts against the inner wall of the groove.

4. The self-locking pneumatic valve according to claim 1, characterized in that: The cylinder body includes a first part and a second part symmetrically arranged at two ends of the first part, the first part and the second part both have a cavity, the electromagnet is accommodated in the cavity of the first part, and the rack is accommodated in the cavity of the first part and the second part.

5. The self-locking pneumatic valve according to claim 4, characterized in that: Pistons are fixedly provided at both ends of the rack, and the pistons are accommodated in the cavity of the second part. The outer wall of each piston is sleeved with a sealing ring, and the outer wall of the sealing ring abuts against the inner wall of the second part; the piston includes a base and an extension part located at one end of the base away from the first part, the axis center line of the base coincides with the axis center line of the extension part, and the outer diameter of the extension part is smaller than the outer diameter of the base.

6. The self-locking pneumatic valve according to claim 5, characterized in that: The first cavity is formed between the ends of the two pistons close to each other, the inner wall of the first part and the inner wall of the end of the second part close to the first part; each second part is provided with a through hole that passes through the outer wall and the inner wall of the second part, and the through hole is connected to the first cavity.

7. The self-locking pneumatic valve according to claim 5, characterized in that: An end cap is fixedly provided at one end of each second part away from the first part, and a second cavity is formed between the end of the end cap close to the first part, the inner wall of the second part and the end of the piston away from the first part.

8. The self-locking pneumatic valve according to claim 7, characterized in that: Two guide blocks are arranged in parallel at one end of each end cover close to the first part, and a limiting block is arranged on the side where the two guide blocks are close to each other, one end of the limiting block is fixedly connected to one side of one guide block, and the other end of the limiting block extends in a direction close to the other guide block, and the guide block is parallel to the extension part; the distance between the two guide blocks is greater than the outer diameter of the extension part and smaller than the outer diameter of the base, and the length of the limiting block is greater than the distance from the side of the guide block close to the limiting block to the outer wall of the extension part; the distance from the limiting block to the end of the guide block close to the base is less than the length of the extension part.

9. The self-locking pneumatic valve according to claim 7, characterized in that: Each of the end covers is provided with a first channel and a second channel, both of which are connected to the second cavity, one of the first channel and the second channel is used for introducing gas into the second cavity, and the other of the first channel and the second channel is used for discharging the gas in the second cavity to the outside.

10. The self-locking pneumatic valve according to claim 1, characterized in that: It also includes an indicator fixedly arranged on the cylinder body, the indicator is electrically connected to the electromagnet, and the indicator is used to indicate the locking state and the unlocking state of the self-locking pneumatic valve.

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