Electromagnetic valve beneficial to axial position matching of action parts
By setting a central hole and a first spring on the moving iron core of the solenoid valve, the problem of difficulty in matching the position between the moving iron core and the static iron core is solved, the efficiency of the electromagnetic drive mechanism and the fluid cut-off performance are improved, and the power consumption of the coil winding is reduced.
Patent Information
- Application Number
- CN202422116630.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-29
AI Technical Summary
During the medium cut-off process of existing solenoid valves, it is difficult to adapt the position of the valve core and the valve seat, the position of the dynamic core and the static core, resulting in a decrease in the electromagnetic utilization rate of the electromagnetic drive mechanism and increasing the power consumption of the coil winding.
A solenoid valve is designed to facilitate the matching of the axial position of the action components. By setting a central hole on the moving iron core and setting a first spring in the central hole, the gap between the moving iron core and the static iron core can be reduced by the compression of the spring and the elastic energy absorption effect, ensuring that the moving iron core and the static iron core are aligned, thereby improving the working efficiency of the electromagnetic driving mechanism.
By optimizing the position matching between the dynamic core and the static core, the efficiency of the electromagnetic drive mechanism is improved, the power consumption of the coil winding is reduced, and the position of the valve core relative to the valve seat is compensated by the elastic deformation amount, ensuring the reliable fluid cutoff performance of the solenoid valve.
Smart Images
Figure CN222910929U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to a solenoid valve that facilitates the axial position matching of moving components. Background Art
[0002] A solenoid valve is a valve device based on electromagnetic drive, which is an automated basic component used to control fluids and is widely used. A solenoid valve belongs to an actuator and is usually used in industrial control systems to adjust the direction, flow rate, speed, or other parameters of the medium according to control instructions.
[0003] Generally, a solenoid valve includes an electromagnetic drive mechanism and a valve body. The electromagnetic drive mechanism includes a housing, an electromagnetic coil installed in the housing, and an iron core assembly centered relative to the electromagnetic coil. The iron core assembly includes an iron core and a valve stem. The iron core includes a moving iron core and a stationary iron core. The valve body includes a valve body and a valve core disposed in the valve body. The valve core is connected to the moving iron core through the valve stem. When the moving iron core moves under the electromagnetic force, the valve core is driven by the valve stem to move, thereby changing the action mode of the valve body on the medium. At the same time, the solenoid valve is also equipped with a return spring located in the electromagnetic drive mechanism or the valve body. When the electromagnetic coil is powered off, the valve core performs a reset action relative to the valve body under the action of the return spring. In summary, the solenoid valve uses electromagnetic force as the driving force and adjusts the direction, flow rate, speed, or other parameters of the medium by controlling the position of the valve core during the working process.
[0004] In the existing medium adjustment method of a solenoid valve, in one way: after the electromagnetic coil is powered on, the moving iron core drives the valve core to move under the electromagnetic force until it fits with the flow path sealing surface on the valve body, and the medium at the valve inlet and outlet is cut off under a sufficient sealing specific pressure at the fitting position.
[0005] When the solenoid valve is used as a medium control device in various industrial fields, in order to ensure the performance of the solenoid valve, it is necessary to further optimize the relevant structure of the solenoid valve. Summary of the Utility Model
[0006] Aiming at the problem of further optimizing the relevant structure of the solenoid valve proposed above, the utility model provides a solenoid valve that facilitates the axial position matching of moving components. In the application of powering on the electromagnetic coil to achieve medium cutoff, this solution facilitates the adaptation of the positions of the valve core and the valve seat, and the positions of the moving iron core and the stationary iron core.
[0007] In view of the above problems, the solenoid valve provided by the utility model that is conducive to the axial position matching of the moving parts solves the problems through the following technical points: The solenoid valve that is conducive to the axial position matching of the moving parts includes a valve body and an electromagnetic drive mechanism connected to the valve body. The electromagnetic drive mechanism includes a coil winding, a moving iron core and a static iron core arranged inside the coil winding. The moving iron core is connected to the valve core of the valve body through a valve rod. The moving iron core is located on the side of the static iron core away from the valve body. A central hole is provided on the moving iron core. The central hole is a stepped hole coaxial with the moving iron core, and the central hole has a stepped surface facing away from the static iron core.
[0008] One end of the valve rod is embedded in the stepped hole, and the valve rod can slide relative to the moving iron core along the axis of the central hole. The end of the valve rod has a positioning shoulder for abutting against the stepped surface.
[0009] It also includes a first spring installed in the central hole. One end of the first spring abuts against the end of the valve rod, and the other end abuts against an end cap. The end cap is connected to the end of the moving iron core away from the static iron core and seals the central hole. The first spring is in a compressed state in the axial direction of the central hole.
[0010] This solution proposes a solenoid valve with the above structural form for the following usage mode of the solenoid valve: After the electromagnetic coil of the coil winding is energized, the moving iron core drives the valve core to move to fit the flow path sealing surface on the valve body under the electromagnetic force, and truncates the media at the inlet and outlet of the valve under a sufficient sealing specific pressure at the fitting position. The specific structural design is used to solve the following problems: To achieve the purpose of medium truncation, a sealing ring is usually configured between the valve core and the flow path sealing surface on the valve body. The sealing ring undergoes elastic deformation under the sealing specific pressure. When the elastic deformation amounts are inconsistent, it will cause the valve core to have different positions in the axial direction of the valve rod. This position is related to the medium pressure in the valve body flow channel and the aging condition of the sealing ring. When the solenoid valve parts are manufactured and assembled, there are inevitably machining and assembly errors of the parts; in the existing electromagnetic drive mechanism including a moving iron core and a static iron core, in order to enable the moving iron core to drive the valve rod better under the action of electromagnetic force, so that the valve rod obtains sufficient driving force and has a high electromagnetic utilization rate, it is advisable to configure a smaller distance between the moving iron core and the static iron core. In the prior art, the valve rod is connected to the steel core of the moving iron core. Therefore, for the above usage mode of the solenoid valve, for example, under the action of the moving iron core, when the valve core moves to the stop position towards the valve seat on the valve body, it is possible that there is a gap between the moving iron core and the static iron core. This gap will reduce the electromagnetic utilization rate of the electromagnetic drive mechanism and increase the power consumption of the coil winding.
[0011] In view of the above problems, the present solution proposes a technical solution in which a central hole is provided on the moving iron core and a first spring is provided in the central hole. One end of the first spring is fixed in position on the axis of the moving iron core, and the other end abuts against the end of the valve stem. The valve stem is slidable relative to the moving iron core.
[0012] The working principle of the present solution is as follows: When the coil winding is energized, the moving iron core moves towards the static iron core. During this process, the valve core moves towards the valve seat sealing position on the valve body under the action of the valve stem. When the valve core moves to the stop position, if the state of the moving iron core abutting against the static iron core is not obtained, which is different from the prior art, the valve stem can further move the moving iron core towards the side where the static iron core is located by compressing the first spring until the moving iron core abuts against the static iron core. At this time, the relative position state of the moving iron core and the static iron core can make the electromagnetic drive mechanism have a higher working efficiency; in addition, before the moving iron core abuts against the static iron core, due to the process of compressing the first spring, the first spring can effectively improve the impact strength between the moving iron core and the static iron core by means of elastic energy absorption; in addition, after the coil winding is powered off, the valve core generally resets under the action of the return spring (the third spring in the present solution). At this time, the valve stem pushes the moving iron core, causing the moving iron core to move towards the end away from the static iron core. Since there is a step surface on the central hole and a positioning shoulder on the valve stem, when the moving iron core moves to the position where the positioning shoulder abuts against the step surface, the moving iron core forces the valve stem to move synchronously with the moving iron core, so that there is a fixed gait between the valve core and the moving iron core.
[0013] In summary, in the application of the electromagnetic coil being energized to achieve medium cutoff, the present solution can be used to solve the problems of the matching of the positions of the valve core and the valve seat and the positions of the moving iron core and the static iron core, thereby ensuring the efficiency of the electromagnetic drive mechanism; in addition, the elastic deformation amount generated by the elasticity of the first spring can compensate for the position of the valve core relative to the valve seat, making the solenoid valve have reliable fluid cutoff performance: compared with the rigid connection between the moving iron core and the valve stem, before the moving iron core contacts the static iron core, the valve core abuts against the valve seat, the valve stem slides relative to the moving iron core and further compresses the first spring. After the moving iron core abuts against the static iron core, the first spring can provide a thrust for the valve stem, enabling the valve core to reach the position where it can achieve sealing, so as to ensure the fluid cutoff ability of the solenoid valve.
[0014] As a further technical solution of the solenoid valve:
[0015] The present solution is applicable to the application of changing the conduction condition of the valve body through linear motion. Preferably, the valve body is a globe valve or a gate valve;
[0016] The positions and dimensions of the valve stem, central hole, and first spring satisfy the following: when the valve core moves to the position where it cuts off the valve body under the action of the valve stem, the moving iron core contacts the static iron core, and the positioning shoulder is separated from the step surface. The above positions and dimensions are defined as follows: when the valve core moves to the position where it abuts against the valve seat, due to the resistance to the further forward movement of the valve core, at this time, the first spring is pushed by the valve stem so that the moving iron core can continue to move towards the static iron core to reduce the gap between the moving iron core and the static iron core or make the final state be that the moving iron core abuts against the static iron core; when, for example, the sealing ring between the valve core and the valve seat ages or the pressure of the medium changes, by a certain degree of sliding of the valve stem relative to the moving iron core forward or backward, the valve core can be adapted to the appropriate position while the position of the moving iron core is fixed.
[0017] To utilize the medium pressure to compensate the sealing specific pressure between the valve core and the valve seat, when the valve body is a shut-off valve, a better application is to arrange the valve core in the flow channel on the medium inlet side of the valve body. In this way, the pressure difference between the inlet and outlet of the valve body can be utilized to maintain the cut-off effect of the solenoid valve on the fluid. However, the following problems exist in this application: when the solenoid valve needs to be opened, the required driving force is relatively large. In the case where the power of the coil winding is small, only relying on the return spring cannot make the valve core reset and cause the inlet and outlet of the valve body to conduct. Based on this, the following solution is provided:
[0018] The valve body includes a valve seat, and a partition is arranged on the valve core and is slidably matched with the valve seat. The partition and the valve seat enclose a second cavity. In the axial direction of the valve stem, the second cavity is on the side of the partition close to the moving iron core, and the sealing surface of the flow channel on the valve seat is on the side of the partition away from the moving iron core;
[0019] One end of the valve core close to the valve stem is also provided with a first cavity. The valve stem is connected to the valve core by the boss at its end being embedded in the first cavity. And, in the axial direction of the valve stem, the boss is restricted in the first cavity and the boss can move relative to the valve core;
[0020] The valve core is also provided with a first guiding through hole. The first guiding through hole has an orifice located in the outlet flow channel on the valve seat, and the first guiding through hole has an orifice connected to the first cavity. The movement of the boss relative to the valve core is as follows: the end of the boss is docked with the first guiding through hole and blocks the orifice of the first guiding through hole;
[0021] It also includes a second spring supported at both ends on the moving iron core and the static iron core respectively. When the valve core is in the state of cutting off the flow channel, in the axial direction of the valve stem, the second spring is in a compressed state;
[0022] The partition is also provided with a second guiding through hole penetrating through both ends thereof.
[0023] In this solution, the sliding fit between the partition plate and the valve seat to form the second cavity can be achieved by arranging an O-ring on the outer periphery of the partition plate. A better application is to arrange a cylindrical valve core seat on the side of the partition plate close to the electromagnetic drive mechanism. An O-ring is arranged between the outer periphery of the valve core seat and the cavity on the valve seat, so that there is a large mating area between the partition plate and the valve seat, and a second cavity located inside the valve core seat is formed. Taking the electromagnetic drive mechanism and the valve core seat being located above the partition plate and the boss being arranged at the lower end of the valve stem as an example, during the process of the valve stem driving the valve core to move downward to cut off the inlet and outlet of the valve body, the boss pushes the valve core downward. When the valve core moves in place, the mutual acting force between the boss and the valve core is maintained. At this time, the end of the boss blocks the first guiding hole. Due to the existence of the second guiding hole, the second cavity and the inlet of the valve body are equalized in pressure at this time. The pressure of the medium in the second cavity is used to assist in maintaining the sealing specific pressure between the valve core and the valve seat. When the coil winding is powered off, the moving iron core loses the driving force to maintain its position. At this time, the second spring rebounds, and the moving iron core drives the valve stem to move upward under the action of the second spring. At this time, the blocking state of the first guiding hole by the boss is removed, and the fluid in the second cavity flows into the outlet flow channel through the first guiding hole. During this process, the pressure difference on both sides of the valve core decreases, and the driving force required to open the valve core is reduced. Then, the moving iron core can further move upward under the action of the second spring, and the valve core can move upward under the action of the third spring, so that the solenoid valve is reset to the state where the valve core is open. In specific applications, the first cavity needs to be communicated with the second cavity. As a better implementation method, the first cavity is arranged on an independent part. This part has a side wall with side holes, and this part is installed at the upper end of the valve core in the second cavity.
[0024] For the purpose of matching the direct contact between the moving iron core and the static iron core, both the moving iron core and the static iron core are provided with counterbores for accommodating the second spring, so that in the contact state, the second spring is accommodated through the counterbores.
[0025] Preferably, in order to enable the solenoid valve to be applied to different pressure occasions, the second guiding hole can be configured to have different medium flow capacities, and it is set that: it further includes a pipe section threadedly connected to the partition plate, and the second guiding hole is the central hole of the pipe section. In this solution, internal threaded holes can be arranged on the partition plate during mass production. During use, according to the use scenarios of different solenoid valves, pipe sections with different central holes are configured, so that each solenoid valve can independently configure the medium flow capacity of the second guiding hole.
[0026] Preferably, as a technical solution that is easy to achieve a good sealing relationship between the lower end of the boss and the first guiding hole, a groove is arranged at the end of the boss, and it further includes a sealing filler embedded in the groove;
[0027] The side of the first cavity away from the valve stem is a spherical surface or a conical surface. The orifice of the first guiding hole connected to the first cavity is located at the top of this side, and the projection of this orifice towards the sealing packing falls within the edge of the sealing packing. In this solution, the groove serves as a sealing packing assembly groove to utilize the sealing packing to obtain a stable effect of blocking the first guiding hole. The spherical or conical side enables the corresponding orifice of the first guiding hole to be located at the top of the bottom surface of the first cavity. Combining with the above projection relationship, the top can be embedded in the sealing packing to ensure the sealing effect.
[0028] To enable the position of the valve core to be monitored in real time, it is set that: a position sensor connected to the valve core is further included, and the position sensor is used to measure the position of the valve core on the valve body.
[0029] As a specific implementation manner of the position sensor, the position sensor is a magnetic position sensor. The magnetic position sensor includes a detection coil and a magnet, and the magnet is suspended on the valve core by a pull rope. In this solution, when the position of the magnet changes as the valve core moves, the detection coil obtains a detection result synchronized with the change in the position of the magnet. According to the detection result, the position of the magnet can be obtained. The pull rope is used to make the position of the magnet change synchronously with the position of the valve core. Compared with rigidly connecting the magnet to the valve core through a connecting rod, to ensure the detection accuracy of the position sensor, even if there is a small gap between the magnet and the detection coil, when the valve core vibrates or undergoes thermal deformation under the action of the fluid, resulting in misalignment of the magnet and the valve core in the radial direction of the valve stem, the pull rope can undergo torsional deformation to optimize the lateral force on the magnet and achieve the purpose of protecting the valve core and the position sensor.
[0030] Preferably, to achieve the external installation of the magnet and the detection coil relative to the flow channel of the valve body and avoid obtaining an incorrect detection result of the valve core position due to the offset of the magnet position under the scouring of the fluid, a connecting rod is further included. The electromagnetic driving mechanism is connected to the upper end of the valve body, the upper end of the connecting rod is connected to the valve core, and the lower end of the connecting rod extends to the outside of the upper flow channel of the valve body. In specific applications, such as when the first cavity and the second cavity are interconnected and located on the medium inlet side of the valve body, the upper end of the connecting rod is located on the medium outlet side of the valve body and extends to the outside of this flow channel through the medium outlet flow channel on the valve body;
[0031] As an integrated solution, the detection coil is fixed to the lower end of the valve body, and the upper end of the pull rope is connected to the lower end of the connecting rod.
[0032] Preferably, the connecting rod is coaxially arranged with the valve core. For better configuration of the connecting rod and the first guiding hole on the valve core, one of the orifices of the first guiding hole is located on the side surface of the connecting rod. The first guiding hole includes the central hole of the connecting rod and the hole channel on the valve core.
[0033] It further includes a third spring disposed between the valve core and the valve body. After the coil winding is energized, the third spring stores energy during the process of driving the valve core to cut off the upper flow path of the valve body through the valve stem. After the coil winding is de-energized, the third spring drives the valve core to move through elastic recovery to make the flow path on the valve body conductive. It is easy to understand that the above third spring is the reset spring of this solenoid valve, which is used to reset the valve core to the state where the valve body is opened after the coil winding is de-energized.
[0034] The utility model has the following beneficial effects:
[0035] In the application of realizing medium cutoff by energizing the electromagnetic coil, this solution can be used to solve the problems of the matching positions of the valve core and the valve seat, and the moving iron core and the static iron core, so as to ensure the efficiency of the electromagnetic driving mechanism; in addition, the elastic deformation amount generated by the elastic deformation of the first spring can be used to compensate for the position of the valve core relative to the valve seat, so that the solenoid valve has reliable fluid cutoff performance: compared with the rigid connection between the moving iron core and the valve stem, before the moving iron core contacts the static iron core, the valve core abuts against the valve seat, the valve stem slides relative to the moving iron core and further compresses the first spring. After the moving iron core abuts against the static iron core, the first spring can provide a thrust for the valve stem, so that the valve core can reach the position where it can achieve sealing, so as to ensure the fluid cutoff ability of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 It is a side view of a specific embodiment of the solenoid valve according to this solution;
[0037] Figure 2 is Figure 1 a cross-sectional view obtained by performing a cross-section along the indicated A-A direction;
[0038] Figure 3 It is a cross-sectional view of a specific embodiment of the solenoid valve according to this solution, which is different from Figure 2 the cross-section adopted, Figure 3 the cross-section adopted is Figure 2 at a 90° angle to the cross-section adopted;
[0039] Figure 4 is Figure 3 an enlarged view of part B shown.
[0040] The reference numerals in the drawings are respectively: 1, moving iron core; 2, housing; 3, coil winding; 4, static iron core; 5, valve core; 6, connecting rod; 7, pulling rope; 8, magnet; 9, first spring; 10, second spring; 11, valve stem; 12, valve core seat; 13, third spring; 14, first through hole; 15, second through hole; 16, valve seat; 17, convex platform; 18, first cavity; 19, second cavity; 20, partition; 21, pipe section. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0041] The present utility model will be further described in detail below in conjunction with embodiments, but the present utility model is not limited to the following embodiments:
[0042] Embodiment 1:
[0043] As Figures 1 to 4 shown, a solenoid valve facilitating the axial position matching of moving components includes a valve body and an electromagnetic driving mechanism connected to the valve body. The electromagnetic driving mechanism includes a coil winding 3, a moving iron core 1 and a static iron core 4 arranged inside the coil winding 3. The moving iron core 1 is connected to the valve core 5 of the valve body through a valve rod 11. The moving iron core 1 is located on the side of the static iron core 4 away from the valve body. A central hole is provided on the moving iron core 1. The central hole is a stepped hole coaxial with the moving iron core 1, and the central hole has a stepped surface facing away from the static iron core 4;
[0044] One end of the valve rod 11 is embedded in the stepped hole, and the valve rod 11 can slide along the axis of the central hole relative to the moving iron core 1. The end of the valve rod 11 has a positioning shoulder for abutting against the stepped surface;
[0045] It further includes a first spring 9 installed in the central hole. One end of the first spring 9 abuts against the end of the valve rod 11, and the other end abuts against an end cap. The end cap is connected to the end of the moving iron core 1 away from the static iron core 4 and seals the central hole. The first spring 9 is in a compressed state in the axial direction of the central hole.
[0046] For the following solenoid valve usage method, the solenoid valve with the above structural form is proposed: After the electromagnetic coil of the coil winding 3 is energized, the moving iron core 1 drives the valve core 5 to move under the electromagnetic force to fit with the flow path sealing surface on the valve body, and truncates the media at the inlet and outlet of the valve under a sufficient sealing specific pressure at the fitting position. The specific structural design is used to solve the following problems: To achieve the purpose of medium truncation, a sealing ring is usually configured between the valve core 5 and the flow path sealing surface on the valve body. The sealing ring undergoes elastic deformation under the sealing specific pressure. When the elastic deformation amounts are inconsistent, it will cause the valve core 5 to have different positions in the axial direction of the valve stem 11, which is related to the medium pressure in the valve body flow channel and the aging condition of the sealing ring. When the solenoid valve parts are manufactured and assembled, there are inevitably machining and assembly errors of the parts; in the existing electromagnetic driving mechanism including the moving iron core 1 and the static iron core 4, in order to enable the moving iron core 1 to drive the valve stem 11 well under the action of electromagnetic force, so that the valve stem 11 obtains sufficient driving force and has a high electromagnetic utilization rate, it is advisable to configure a smaller distance between the moving iron core 1 and the static iron core 4. In the prior art, the valve stem 11 is connected to the steel core of the moving iron core 1. Therefore, for the above usage method of the solenoid valve, for example, when the valve core 5 moves to the stop position towards the valve seat 16 on the valve body under the action of the moving iron core 1, the possible situation is that there is a gap between the moving iron core 1 and the static iron core 4, and this gap will reduce the electromagnetic utilization rate of the electromagnetic driving mechanism and increase the power consumption of the coil winding 3.
[0047] To solve the above problems, this solution proposes a technical solution in which a central hole is provided on the moving iron core 1 and a first spring 9 is provided in the central hole. One end of the first spring 9 is fixed in position on the axis of the moving iron core 1, and the other end abuts against the end of the valve stem 11. The valve stem 11 is slidable relative to the moving iron core 1.
[0048] The working principle of this solution is as follows: When the coil winding 3 is energized, the moving iron core 1 moves towards the static iron core 4. During this process, the valve core 5 moves towards the sealing position of the valve seat 16 on the valve body under the action of the valve stem 11. When the valve core 5 moves to the stop position, if the state where the moving iron core 1 abuts against the static iron core 4 is not obtained, which is different from the prior art, the valve stem 11 can make the moving iron core 1 move further towards the side where the static iron core 4 is located by compressing the first spring 9 until the moving iron core 1 abuts against the static iron core 4. At this time, the relative position state of the moving iron core 1 and the static iron core 4 can make the electromagnetic driving mechanism have a higher working efficiency; in addition, before the moving iron core 1 abuts against the static iron core 4, due to the process of compressing the first spring 9, the first spring 9 can effectively improve the impact strength between the moving iron core 1 and the static iron core 4 by means of elastic energy absorption; in addition, after the coil winding 3 is powered off, the valve core 5 generally resets under the action of the reset spring (the third spring 13 in this solution). At this time, the valve stem 11 pushes the moving iron core 1, making the moving iron core 1 move towards the end away from the static iron core 4. Since there is a stepped surface on the central hole and a positioning shoulder on the valve stem 11, when the moving iron core 1 moves to the position where the positioning shoulder abuts against the stepped surface, the moving iron core 1 forces the valve stem 11 to move synchronously with the moving iron core 1, so that there is a fixed gait between the valve core 5 and the moving iron core 1.
[0049] In summary, in the application of energizing the electromagnetic coil to cut off the medium, this solution can be used to solve the problem of the matching positions of the valve core 5 and the valve seat 16, and the moving iron core 1 and the static iron core 4, so as to ensure the efficiency of the electromagnetic driving mechanism; in addition, the elastic deformation amount generated by the elasticity of the first spring 9 can be used to compensate for the position of the valve core 5 relative to the valve seat 16, so that the solenoid valve has a reliable fluid cut-off performance: compared with the rigid connection between the moving iron core 1 and the valve stem 11, before the moving iron core 1 contacts the static iron core 4, the valve core 5 abuts against the valve seat 16, the valve stem 11 slides relative to the moving iron core 1 and further compresses the first spring 9. After the moving iron core 1 abuts against the static iron core 4, the first spring 9 can provide a thrust for the valve stem 11, so that the valve core 5 can reach the position where it can achieve sealing to ensure the fluid cut-off ability of the solenoid valve.
[0050] Embodiment 2:
[0051] This embodiment is further refined on the basis of Embodiment 1:
[0052] This solution is applicable to the application of changing the conduction situation of the valve body through linear motion. Preferably, the valve body is a globe valve or a gate valve;
[0053] The positions and dimensions of the valve stem 11, the central hole, and the first spring 9 satisfy the following: When the valve core 5 moves to the position of cutting off the valve body under the action of the valve stem 11, the moving iron core 1 contacts the static iron core 4, and the positioning shoulder is separated from the step surface. The above positions and dimensions are defined as follows: When the valve core 5 moves to the position where it abuts against the valve seat 16, since the valve core 5 is blocked from further moving forward, at this time, the first spring 9 is pushed by the valve stem 11 so that the moving iron core 1 can continue to move towards the static iron core 4 to reduce the gap between the moving iron core 1 and the static iron core 4 or make the final state be that the moving iron core 1 abuts against the static iron core 4; When the sealing ring between the valve core 5 and the valve seat 16 ages or the pressure of the medium changes, by a certain degree of sliding of the valve stem 11 relative to the moving iron core 1 forward or backward, the valve core 5 can be adapted to the appropriate position while the position of the moving iron core 1 is fixed.
[0054] Embodiment 3:
[0055] This embodiment is further refined on the basis of Embodiment 1:
[0056] To utilize the medium pressure to compensate the sealing specific pressure between the valve core 5 and the valve seat 16, for example, when the valve body is a cut-off valve, a better application is to arrange the valve core 5 in the flow channel on the medium inlet side of the valve body. In this way, the pressure difference between the inlet and outlet of the valve body can be utilized to maintain the cut-off effect of the solenoid valve on the fluid. However, the following problems exist in this application: When the solenoid valve needs to be opened, a relatively large driving force is required. When the power of the coil winding 3 is small, the valve core 5 cannot be reset only by the return spring, resulting in the conduction of the inlet and outlet of the valve body. Based on this, the following solution is provided:
[0057] The valve body includes a valve seat 16. A partition 20 that is slidably matched with the valve seat 16 is arranged on the valve core 5. The partition 20 and the valve seat 16 enclose a second cavity 19. In the axial direction of the valve stem 11, the second cavity 19 is on the side of the partition 20 close to the moving iron core 1, and the sealing surface of the flow channel on the valve seat 16 of the valve core 5 is on the side of the partition 20 away from the moving iron core 1;
[0058] One end of the valve core 5 close to the valve stem 11 is further provided with a first cavity 18. The valve stem 11 is connected to the valve core 5 by embedding a boss 17 at its end into the first cavity 18. And, in the axial direction of the valve stem 11, the boss 17 is restricted in the first cavity 18, and the boss 17 can move relative to the valve core 5;
[0059] The valve core 5 is further provided with a first guide through hole 14. The first guide through hole 14 has an orifice in the outlet flow channel on the valve seat 16, and the first guide through hole 14 has an orifice connected to the first cavity 18. The movement of the boss 17 relative to the valve core 5 is as follows: The end of the boss 17 is butted against the first guide through hole 14 and blocks the orifice of the first guide through hole 14;
[0060] It further includes a second spring 10 with two ends respectively supported on the moving iron core 1 and the static iron core 4. When the valve core 5 is in the state of cutting off the flow channel, the second spring 10 is in a compressed state in the axial direction of the valve stem 11.
[0061] A second guide through hole 15 penetrating through both ends thereof is further provided on the partition plate 20.
[0062] In this solution, the sliding fit between the partition plate 20 and the valve seat 16 and the formation of the second cavity 19 can be achieved by providing an O-ring on the outer periphery of the partition plate 20. A better application is to provide a cylindrical valve core seat 12 on the side of the partition plate 20 close to the electromagnetic driving mechanism. An O-ring is provided between the outer periphery of the valve core seat 12 and the cavity on the valve seat 16, so that there is a large mating area between the partition plate 20 and the valve seat 16, and the second cavity 19 located inside the valve core seat 12 is formed. Taking the electromagnetic driving mechanism and the valve core seat 12 being located above the partition plate 20 and the boss 17 being provided at the lower end of the valve stem 11 as an example, during the process of the valve stem 11 driving the valve core 5 to move downward to cut off the inlet and outlet of the valve body, the boss 17 pushes the valve core 5 to move downward. When the valve core 5 moves in place, the mutual acting force between the boss 17 and the valve core 5 is maintained. At this time, the end of the boss 17 blocks the first guide through hole 14. Due to the existence of the second guide through hole 15, the second cavity 19 and the inlet of the valve body are equalized in pressure at this time. The pressure of the medium in the second cavity 19 is used to assist in maintaining the sealing specific pressure between the valve core 5 and the valve seat 16. When the coil winding 3 is powered off, the moving iron core 1 loses the driving force to maintain its position. At this time, the second spring 10 rebounds, and the moving iron core 1 drives the valve stem 11 to move upward under the action of the second spring 10. At this time, the blocking state of the boss 17 on the first guide through hole 14 is removed, and the fluid in the second cavity 19 flows into the outlet flow channel through the first guide through hole 14. During this process, the pressure difference on both sides of the valve core 5 decreases, and the driving force required for the valve core 5 to open is reduced. Then, the moving iron core 1 can further move upward under the action of the second spring 10, and the valve core 5 can move upward under the action of the third spring 13, so that the solenoid valve resets to the state where the valve core 5 is open. In specific applications, the first cavity 18 needs to be communicated with the second cavity 19. As a better implementation method, the first cavity 18 is provided on an independent part. This part has a side wall with side holes, and this part is installed in the second cavity 19 and above the valve core 5.
[0063] Embodiment 4:
[0064] This embodiment is further refined on the basis of Embodiment 3:
[0065] Preferably, in order to enable the solenoid valve to be applied to different pressure scenarios, the second through hole 15 can be configured to have different medium flow capacities, and it is set that: further includes a pipe section 21 threadedly connected to the partition plate 20, and the second through hole 15 is the central hole of the pipe section 21. In this solution, internal threaded holes can be provided on the batch-manufactured partition plate 20. During use, according to the usage scenarios of different solenoid valves, pipe sections 21 with different central holes are configured, so that each solenoid valve can independently configure the medium flow capacity of the second through hole 15.
[0066] Preferably, as a technical solution that is easy to achieve a good sealing relationship between the lower end of the boss 17 and the first through hole 14, a groove is provided at the end of the boss 17, and further includes a sealing filler embedded in the groove;
[0067] The side of the first cavity 18 away from the valve stem 11 is a spherical surface or a conical surface. The orifice of the first through hole 14 connected to the first cavity 18 is located at the top of this side, and the projection of this orifice towards the sealing filler falls within the edge of the sealing filler. In this solution, the groove serves as a sealing filler assembly groove to utilize the sealing filler to obtain a stable effect of blocking the first through hole 14. The side that is a spherical surface or a conical surface makes the corresponding orifice of the first through hole 14 located at the top of the bottom surface of the first cavity 18. With the above projection relationship, the top can be embedded in the sealing filler to ensure the sealing effect.
[0068] Example 5:
[0069] This embodiment is further refined on the basis of Embodiment 1:
[0070] In order to enable the position of the valve core 5 to be monitored in real time, it is set that: further includes a position sensor connected to the valve core 5, and the position sensor is used to measure the position of the valve core 5 on the valve body.
[0071] As a specific implementation manner of the position sensor, the position sensor is a magnetic position sensor. The magnetic position sensor includes a detection coil and a magnet 8, and the magnet 8 is suspended on the valve core 5 by a pull rope 7. In this solution, when the position of the magnet 8 changes as the valve core 5 moves, the detection coil obtains a detection result synchronized with the position change of the magnet 8. According to the detection result, the position of the magnet 8 can be obtained. The pull rope 7 is used to make the position of the magnet 8 change synchronously with the position of the valve core 5. Compared with rigidly connecting the magnet 8 to the valve core 5 through a connecting rod 6, to ensure the detection accuracy of the position sensor, even if there is a small gap between the magnet 8 and the detection coil, when due to vibration or thermal deformation of the valve core 5 under the action of fluid, etc., resulting in a misalignment of the magnet 8 and the valve core 5 in the radial direction of the valve stem 11, the pull rope 7 can undergo torsional deformation to optimize the lateral force on the magnet 8, etc., achieving the purpose of protecting the valve core 5 and the position sensor.
[0072] Preferably, in order to realize the external installation of the magnet 8 and the detection coil relative to the valve body flow channel, so as to avoid the position displacement of the magnet 8 caused by the flushing of the fluid and obtain the wrong valve core 5 position detection result, it also includes a connecting rod 6, the electromagnetic drive mechanism is connected to the upper end of the valve body, the upper end of the connecting rod 6 is connected to the valve core 5, and the lower end of the connecting rod 6 extends to the outside of the flow channel on the valve body. In specific use, when the first cavity 18 and the second cavity 19 are connected to each other and are located on the medium inlet side of the valve body, the upper end of the connecting rod 6 is located on the medium outlet side of the valve body, and extends to the outside of the flow channel through the medium outlet flow channel on the valve body;
[0073] As an integrated solution, the detection coil is fixed to the lower end of the valve body, and the upper end of the pull rope 7 is connected to the lower end of the connecting rod 6.
[0074] Preferably, the connecting rod 6 is coaxially arranged with the valve core 5 , and the connecting rod 6 and the first conducting hole 14 are preferably configured on the valve core 5 , one of the openings of the first conducting hole 14 is located on the side of the connecting rod 6 , and the first conducting hole 14 includes the central hole of the connecting rod 6 and the channel on the valve core 5 .
[0075] Embodiment 6:
[0076] This embodiment is further refined on the basis of embodiment 1:
[0077] It also includes a third spring 13 disposed between the valve core 5 and the valve body. After the coil winding 3 is energized, the third spring 13 drives the valve core 5 to cut off the flow path on the valve body through the valve stem 11 to store energy. After the coil winding 3 is de-energized, the third spring 13 drives the valve core 5 to move through elastic recovery to open the flow path on the valve body. It is easy to understand that the third spring 13 is the reset spring of the solenoid valve, which is used to reset the valve core 5 to a state where the valve body is open after the coil winding 3 is de-energized.
[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the protection scope of the present invention.
Claims
1. A solenoid valve that is conducive to axial position matching of actuating parts, comprising a valve body and an electromagnetic drive mechanism connected to the valve body, wherein the electromagnetic drive mechanism comprises a coil winding (3) and a moving iron core (1) and a stationary iron core (4) arranged inside the coil winding (3), wherein the moving iron core (1) is connected to a valve core (5) of the valve body through a valve stem (11), and the moving iron core (1) is located on a side of the stationary iron core (4) away from the valve body, and is characterized in that: The moving iron core (1) is provided with a center hole, the center hole is a stepped hole coaxial with the moving iron core (1), and the center hole has a stepped surface facing away from the stationary iron core (4); One end of the valve stem (11) is embedded in the step hole, the valve stem (11) can slide relative to the moving iron core (1) along the axis of the center hole, and the end of the valve stem (11) has a positioning shoulder for abutting against the step surface; It also includes a first spring (9) installed in the center hole, one end of the first spring (9) abuts against the end of the valve stem (11), and the other end abuts against the end cap, the end cap is connected to the end of the moving iron core (1) away from the static iron core (4) and blocks the center hole, and the first spring (9) is in a compressed state in the axial direction of the center hole.
2. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 1, characterized in that: The valve body is a stop valve or a gate valve; The position and size of the valve stem (11), the center hole, and the first spring (9) satisfy the following conditions: when the valve core (5) moves to the position of cutting off the valve body under the action of the valve stem (11), the moving iron core (1) contacts the stationary iron core (4), and the positioning shoulder is separated from the step surface.
3. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 1, characterized in that: The valve body comprises a valve seat (16), and a partition (20) is provided on the valve core (5) and is slidably matched with the valve seat (16). The partition (20) and the valve seat (16) enclose a second cavity (19). In the axial direction of the valve stem (11), the second cavity (19) is located on a side of the partition (20) close to the moving iron core (1), and a sealing surface of the flow channel between the valve core (5) and the valve seat (16) is located on a side of the partition (20) away from the moving iron core (1); A first cavity (18) is further provided at one end of the valve core (5) close to the valve stem (11); the valve stem (11) is connected to the valve core (5) by embedding the boss (17) at its end into the first cavity (18); and, in the axial direction of the valve stem (11), the boss (17) is restricted in the first cavity (18); the boss (17) can move relative to the valve core (5); The valve core (5) is also provided with a first conducting hole (14), the first conducting hole (14) having an orifice located in an outlet flow channel on the valve seat (16), the first conducting hole (14) having an orifice connected to the first cavity (18), and the boss (17) can move relative to the valve core (5) in such a way that the end of the boss (17) is connected to the first conducting hole (14) and blocks the orifice of the first conducting hole (14); It also includes a second spring (10) with two ends respectively supported on the moving iron core (1) and the stationary iron core (4); when the valve core (5) is in a state of cutting off the flow channel, the second spring (10) is in a compressed state in the axial direction of the valve stem (11); The partition plate (20) is also provided with a second conducting hole (15) penetrating through both ends thereof.
4. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 3, characterized in that: It also comprises a pipe section (21) threadedly connected to the partition plate (20), and the second conducting hole (15) is a central hole of the pipe section (21).
5. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 3, characterized in that: The end of the boss (17) is provided with a groove, and also includes a sealing filler embedded in the groove; The side surface of the first cavity (18) away from the valve stem (11) is a spherical surface or a conical surface, and the opening where the first conducting hole (14) connects with the first cavity (18) is located at the top of the side surface, and the projection of the opening toward the sealing filler falls within the edge of the sealing filler.
6. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 1, characterized in that: It also comprises a position sensor connected to the valve core (5), wherein the position sensor is used to measure the position of the valve core (5) on the valve body.
7. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 6, characterized in that: The position sensor is a magnetic position sensor, comprising a detection coil and a magnet (8), wherein the magnet (8) is suspended on the valve core (5) via a pull rope (7).
8. The solenoid valve that facilitates axial position matching of the actuating parts according to claim 7, characterized in that: It also includes a connecting rod (6), the electromagnetic drive mechanism is connected to the upper end of the valve body, the upper end of the connecting rod (6) is connected to the valve core (5), and the lower end of the connecting rod (6) extends to the outer side of the flow channel on the valve body; The detection coil is fixed to the lower end of the valve body, and the upper end of the pull rope (7) is connected to the lower end of the connecting rod (6).
9. The solenoid valve that facilitates axial position matching of the actuating parts according to any one of claims 1 to 8, characterized in that: The valve body further comprises a third spring (13) arranged between the valve core (5) and the valve body. When the coil winding (3) is energized, the third spring (13) drives the valve core (5) to cut off the flow passage on the valve body through the valve stem (11) to store energy. When the coil winding (3) is de-energized, the third spring (13) drives the valve core (5) to move through elastic recovery to open the flow passage on the valve body.