Low-inertia moving-coil driving precision diaphragm valve

Abstract

The low-inertia moving-coil driving precision diaphragm valve comprises a valve body, an inlet flow channel and an outlet flow channel are arranged on the valve body, a valve core for controlling the opening and closing of the inlet flow channel and the outlet flow channel is further arranged in the valve body, a diaphragm and a moving-coil electromagnet assembly for controlling the action of the valve core are arranged on the valve core, the moving-coil electromagnet assembly comprises a coil holder, a driving coil is arranged on the coil holder, a permanent magnet and an inner magnetic yoke are arranged at the center of the coil holder, when the driving coil is electrified, the driving coil moves along the axial direction under the electromagnetic force and drives the diaphragm to deform, and then the valve core is driven to move to control the opening and closing of the inlet flow channel and the outlet flow channel.

Description

Technical Field

[0001] This utility model relates to a low-inertia moving coil driven precision diaphragm valve, belonging to the field of valves. Background Technology

[0002] In fluid control scenarios in high-end fields such as industrial automation and precision instruments, diaphragm valves must simultaneously meet the core requirements of low inertia, high-precision flow regulation, and high-pressure sealing. However, existing products have significant technical shortcomings: On the one hand, traditional diaphragm valves generally adopt a moving iron drive structure, with moving parts integrating components such as iron cores with large mass, resulting in large motion inertia and lag response. Furthermore, the nonlinear characteristics of the magnetic field distribution restrict the control accuracy of displacement and flow, making it difficult to adapt to high-frequency and refined control requirements. On the other hand, their valve cores mostly use traditional structures such as ball valves, disc-shaped valves, or cone-shaped valves. The flow regulation of these valve cores is stepped, which cannot achieve gradual fine-tuning of small flow rates. Moreover, the sealing surface contact design is unreasonable, which can easily lead to leakage problems caused by poor sealing under high-pressure conditions.

[0003] Although the moving-coil drive structure, with its coil as the core moving part, can significantly reduce the mass of moving parts and decrease inertial loss, while also possessing excellent linear drive characteristics, effectively improving response speed and control accuracy; and the needle valve core, relying on a slender conical structure, can precisely adjust the flow gap through a small stroke to achieve fine flow control, and the line contact sealing structure has higher sealing reliability under high-pressure conditions, the two have not yet been optimized and integrated in diaphragm valves. This results in existing diaphragm valves not being able to fully utilize the synergistic advantages of the two technologies, making it difficult to meet the comprehensive requirements of low inertia, high precision, and high sealing in high-end precision scenarios, thus restricting their promotion and application in related fields. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a low-inertia moving coil driven precision diaphragm valve.

[0005] A low-inertia moving-coil driven precision diaphragm valve includes a valve body with an inlet flow channel and an outlet flow channel. The valve body also contains a valve core for controlling the opening and closing of the inlet and outlet flow channels. The valve core has a diaphragm and a moving-coil electromagnet assembly for controlling its movement. The moving-coil electromagnet assembly includes a coil frame with a drive coil wound around it. A permanent magnet and an inner yoke are located at the center of the coil frame. When the drive coil is energized, it moves axially under electromagnetic force, causing the diaphragm to deform, thereby driving the valve core to move and control the opening and closing of the inlet and outlet flow channels.

[0006] The above technical solution utilizes a moving-coil electromagnet assembly with a drive coil as the main moving component. Compared to the traditional moving-iron structure, this eliminates the mass of the following iron core, significantly reducing the mass of the moving parts and thus greatly decreasing the valve core's driving inertia. Combined with the linear force characteristics of the coil in a magnetic field, it achieves faster opening and closing response speeds and higher dynamic tracking performance, making it suitable for high-frequency, high-precision fluid control applications. It avoids the control accuracy degradation caused by hysteresis and nonlinear magnetic circuits in traditional moving-iron drives, making the displacement control of the diaphragm and valve core more predictable and easier to achieve closed-loop regulation, thereby enabling more precise micro-flow regulation.

[0007] Furthermore, the moving-coil electromagnet assembly includes a housing covering the outside of the coil frame, and a magnetic isolation ring is provided on the top of the permanent magnet. Both the permanent magnet and the magnetic isolation ring are arranged in a cylindrical shape so that the inner magnetic yoke can pass through and form an electromagnetic engagement with the drive coil.

[0008] Through the above technical solution, the magnetic isolation ring is located on the top of the permanent magnet, which can form a magnetic resistance shielding layer on the top of the magnetic circuit, suppress the leakage of the magnetic field to the non-working area, and allow more magnetic flux to be closed between the inner magnetic yoke and the drive coil, thereby enhancing the force on the coil and improving the electromagnetic drive efficiency.

[0009] Furthermore, a support spring is connected to the bottom of the inner magnetic yoke, and the other end of the support spring abuts against the coil frame. A connector is provided on the diaphragm, and the other end of the connector passes through the coil frame and is fixedly connected to the support spring, so that the valve core is driven by the support spring to cut off the control inlet and outlet flow channels when the drive coil is not energized.

[0010] Through the above technical solution, the support spring provides a stable elastic force downward when the drive coil is not energized, directly driving the diaphragm and valve core back to the closed position, cutting off the inlet flow channel from the outlet flow channel, thereby ensuring that the valve is in a safe closed state in the event of power failure or malfunction.

[0011] Furthermore, a flow port is provided between the inlet flow channel and the outlet flow channel, and the end of the valve core is arranged in a needle shape to match the flow port.

[0012] Through the above technical solution, the end of the needle valve core and the flow port form a controllable annular gap structure. Compared with the stepped opening change of traditional spherical, cone plug or flat valve cores, it can achieve smoother and more gradual flow regulation, which is very suitable for small flow and high precision control scenarios.

[0013] Furthermore, the diaphragm and valve core are integrated, the diaphragm has several annular protrusions on its lower side, and the valve body has an annular groove that mates with the annular protrusions.

[0014] Through the above technical solution, the integrated structure avoids the loosening of the connecting parts, gap accumulation, and force transmission loss of the traditional split diaphragm and valve core. This allows the axial movement of the drive coil to be directly transmitted to the valve core, reducing hysteresis and mechanical errors, and improving the synchronization and transient response performance of the valve core movement. Multiple annular protrusions embedded in corresponding annular grooves in the valve body provide multi-level radial and axial positioning constraints for the diaphragm, enabling it to maintain its positional stability under repeated deformation, fluid pressure impact, and high-frequency drive.

[0015] Furthermore, the connector is arranged in an inverted T shape, and the diaphragm is provided with a connecting groove that cooperates with and is fixed to the connector.

[0016] Through the above technical solution, the transverse flange of the inverted T-shaped connector can be embedded inside the connecting groove of the diaphragm, so that the diaphragm can remain firmly fixed under long-term high-frequency reciprocating deformation or pressure impact, avoiding the problem of easy loosening of traditional direct insertion or screw connection.

[0017] Furthermore, a sealing ring is provided between the outer casing and the valve body.

[0018] Through the above technical solution, the sealing ring forms a sealing barrier between the outer shell and the valve body, which can effectively prevent the medium from penetrating into the electromagnetic drive cavity under high pressure or pulsating conditions, avoid fluid intrusion that could lead to coil short circuit, permanent magnet corrosion or internal structural failure, and improve the working reliability of the valve.

[0019] Furthermore, the outer casing and the valve body are fixedly connected by bolts.

[0020] Through the above technical solutions, the bolt connection method has a simple structure and flexible assembly, and can be quickly positioned and tightened during the production process; when maintaining or replacing components, it can be quickly separated by removing the bolts without destructive disassembly, which significantly improves maintenance efficiency.

[0021] The beneficial effects of this invention are as follows: The moving-coil electromagnet assembly, which uses a drive coil as the main moving part, eliminates the mass of the following iron core compared to the traditional moving-iron structure, significantly reducing the mass of the moving parts and thus greatly decreasing the valve core's driving inertia. Combined with the linear force characteristics of the coil in a magnetic field, it achieves faster opening and closing response speeds and higher dynamic tracking performance, making it suitable for high-frequency, high-precision fluid control applications. It avoids the control accuracy degradation caused by hysteresis and nonlinear magnetic circuits in traditional moving-iron drives, making the displacement control of the diaphragm and valve core more predictable and easier to achieve closed-loop regulation, thereby realizing more precise micro-flow regulation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0023] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model without the outer shell; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the valve core structure in this utility model; In the diagram, 1. Valve body; 11. Inlet flow channel; 12. Outlet flow channel; 13. Flow port; 14. Annular groove; 2. Outer shell; 21. Sealing ring; 3. Valve core; 31. Diaphragm; 32. Annular protrusion; 33. Connecting groove; 4. Moving coil electromagnet assembly; 41. Coil frame; 42. Drive coil; 43. Permanent magnet; 44. Inner yoke; 45. Magnetic isolation ring; 46. Support spring; 47. Connecting piece. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0025] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0026] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0027] like Figure 1-4The illustration shows an embodiment of a low-inertia moving-coil driven precision diaphragm valve according to the present invention. It includes a valve body 1 with an inlet channel 11 and an outlet channel 12. The valve body 1 also contains a valve core 3 for controlling the opening and closing of the inlet channel 11 and the outlet channel 12. The valve core 3 has a diaphragm 31 and a moving-coil electromagnet assembly 4 for controlling the movement of the valve core 3. The moving-coil electromagnet assembly 4 includes a coil frame 41 with a drive coil 42 wound around it. The coil frame 41 has a permanent magnet 43 and an inner yoke 44 at its center. When the drive coil 42 is energized, it moves axially under electromagnetic force, causing the diaphragm 31 to deform, thereby driving the valve core 3 to move and control the opening and closing of the inlet channel 11 and the outlet channel 12.

[0028] Through the above technical solution, the moving-coil electromagnet assembly 4, which uses the drive coil 42 as the main moving component, eliminates the mass of the following iron core compared to the traditional moving-iron structure, significantly reducing the mass of the moving parts and thus greatly reducing the driving inertia of the valve core 3. Combined with the linear force characteristics of the coil in a magnetic field, it achieves faster opening and closing response speeds and higher dynamic tracking performance, making it suitable for high-frequency, high-precision fluid control applications. It avoids the control accuracy degradation caused by hysteresis and nonlinear magnetic circuits in traditional moving-iron drives, making the displacement control of the diaphragm 31 and valve core 3 more predictable and easier to control in a closed loop, thereby achieving more precise micro-flow regulation.

[0029] The moving-coil electromagnet assembly 4 includes a housing 2 covering the outside of the coil frame 41. The permanent magnet 43 is provided with a magnetic shielding ring 45 on its top. Both the permanent magnet 43 and the magnetic shielding ring 45 are arranged in a cylindrical shape so that the inner magnetic yoke 44 can pass through and form an electromagnetic engagement with the drive coil 42.

[0030] Through the above technical solution, the magnetic isolation ring 45 is located on the top of the permanent magnet 43, which can form a magnetic resistance shielding layer on the top of the magnetic circuit, suppress the leakage of the magnetic field to the non-working area, and allow more magnetic flux to be closed between the inner magnetic yoke 44 and the drive coil 42, thereby enhancing the force on the coil and improving the electromagnetic drive efficiency.

[0031] The bottom of the inner magnetic yoke 44 is connected to a support spring 46, the other end of which abuts against the coil frame 41. The diaphragm 31 is provided with a connector 47, the other end of which is threadedly connected to the coil frame 41, and the end extends through the bottom of the support spring 46 to fix the support spring 46, so that the valve core 3 is driven by the support spring 46 to cut off the control inlet flow channel 11 and outlet flow channel 12 when the drive coil 42 is not energized.

[0032] Through the above technical solution, the support spring 46 provides a stable elastic force downward when the drive coil 42 is not energized, directly driving the diaphragm 31 and valve core 3 back to the closed position, cutting off the inlet flow channel 11 from the outlet flow channel 12, thereby ensuring that the valve is in a safe closed state in the event of power failure, malfunction, etc.

[0033] A flow port 13 is provided between the inlet flow channel 11 and the outlet flow channel 12, and the end of the valve core 3 is arranged in a needle shape to match the flow port 13.

[0034] Through the above technical solution, the end of the needle valve core 3 and the flow port 13 form a controllable annular gap structure. Compared with the stepped opening change of the traditional spherical, cone plug or flat valve core 3, it can achieve smoother and more gradual flow regulation, which is very suitable for small flow and high precision control scenarios.

[0035] Optionally, in some embodiments, the diaphragm 31 and the valve core 3 are integrated, the diaphragm 31 has a plurality of annular protrusions 32 on its lower side, and the valve body 1 has an annular groove 14 that cooperates with the annular protrusions 32.

[0036] Through the above technical solution, the integrated structure avoids the loosening, gap accumulation, and force transmission loss of the connecting piece 47 between the traditional split diaphragm 31 and valve core 3, allowing the axial movement of the drive coil 42 to be directly transmitted to the valve core 3, reducing hysteresis and mechanical errors, and improving the synchronization and transient response performance of the valve core 3's movement. Multiple annular protrusions 32 are embedded in the corresponding annular grooves 14 of the valve body 1, which can provide multi-level radial and axial positioning constraints for the diaphragm 31, enabling the diaphragm 31 to maintain its positional stability under repeated deformation, fluid pressure impact, and high-frequency drive.

[0037] Optionally, in some embodiments, the connector 47 is arranged in an inverted T shape, and the diaphragm 31 is provided with a connecting groove 33 that cooperates with and is fixed to the connector 47.

[0038] Through the above technical solution, the transverse flange of the inverted T-shaped connector 47 can be embedded in the connecting groove 33 of the diaphragm 31, so that the diaphragm 31 can remain firmly fixed under long-term high-frequency reciprocating deformation or pressure impact, avoiding the problem of easy loosening of traditional direct insertion or screw connection.

[0039] Optionally, in some embodiments, a sealing ring 21 is provided between the housing 2 and the valve body 1.

[0040] Through the above technical solution, the sealing ring 21 forms a sealing barrier between the outer shell 2 and the valve body 1, which can effectively prevent the medium from penetrating into the electromagnetic drive cavity under high pressure or pulsating conditions, avoid fluid intrusion that could lead to coil short circuit, corrosion of permanent magnet 43 or failure of internal structure, and improve the working reliability of the valve.

[0041] The outer casing 2 is fixedly connected to the valve body 1 by bolts.

[0042] Through the above technical solutions, the bolt connection method has a simple structure and flexible assembly, and can be quickly positioned and tightened during the production process; when maintaining or replacing components, it can be quickly separated by removing the bolts without destructive disassembly, which significantly improves maintenance efficiency.

[0043] The working principle of this low-inertia moving coil driven precision diaphragm valve is as follows: In the initial state (power off state), the support spring releases the preload, pushing the coil frame and connector downwards. The connector presses the diaphragm and the integrated valve core tightly against the flow port. At this time, the inlet and outlet flow channels are blocked, and the valve is in the normally closed state.

[0044] When the valve needs to be opened or the flow rate needs to be adjusted, the control system supplies current to the drive coil. The drive coil, located in the strong magnetic field created by the permanent magnet, inner yoke, outer shell, and magnetic shielding ring, immediately experiences an upward Ampere force (electromagnetic force). This force overcomes the elastic force of the supporting spring and the elastic resistance of the diaphragm, causing the extremely light coil frame to move upward very quickly. The coil frame, through the connecting piece, causes the center of the diaphragm to undergo elastic deformation upward, thereby lifting the valve core away from the flow port and opening the inlet and outlet flow channels. Due to the extremely small mass of the moving parts and the extremely low system inertia, the coil position can be adjusted at a very high frequency in response to changes in the current. To adjust the flow rate, simply change the current supplied to the drive coil. Utilizing the force balance between the electromagnetic force and the spring force, the valve core can be precisely stabilized at different opening heights. Combined with the needle valve core structure, this achieves precise linear control of the fluid flow rate. When the power is cut off, the electromagnetic force disappears instantly, and under the action of the supporting spring and the diaphragm's own rebound force, the valve core quickly returns to its original position and closes the valve.

[0045] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

[0046] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A low-inertia moving coil driven precision diaphragm valve, characterized in that: The device includes a valve body with an inlet flow channel and an outlet flow channel. The valve body also contains a valve core for controlling the opening and closing of the inlet and outlet flow channels. The valve core has a diaphragm and a moving-coil electromagnet assembly for controlling its movement. The moving-coil electromagnet assembly includes a coil frame with a drive coil wound around it. A permanent magnet and an inner yoke are located at the center of the coil frame. When the drive coil is energized, it moves axially under electromagnetic force, causing the diaphragm to deform, thereby driving the valve core to move and control the opening and closing of the inlet and outlet flow channels.

2. The low-inertia moving coil driven precision diaphragm valve as described in claim 1, characterized in that: The moving-coil electromagnet assembly includes a housing covering the outside of the coil frame, and a magnetic isolation ring is provided on the top of the permanent magnet. Both the permanent magnet and the magnetic isolation ring are arranged in a cylindrical shape so that the inner magnetic yoke can pass through and form an electromagnetic engagement with the drive coil.

3. The low-inertia moving coil driven precision diaphragm valve as described in claim 2, characterized in that: The bottom of the inner magnetic yoke is connected to a support spring, the other end of which abuts against the coil frame. The diaphragm is provided with a connector, the other end of which passes through the coil frame and is fixedly connected to the support spring, so that the valve core is driven by the support spring to cut off the control inlet and outlet flow channels when the drive coil is not energized.

4. The low-inertia moving coil driven precision diaphragm valve as described in claim 1 or 3, characterized in that: A flow port is provided between the inlet flow channel and the outlet flow channel, and the end of the valve core is arranged in a needle shape to match the flow port.

5. The low-inertia moving coil driven precision diaphragm valve as described in claim 1, characterized in that: The diaphragm and valve core are integrated. The diaphragm has several annular protrusions on its lower side, and the valve body has an annular groove that mates with the annular protrusions.

6. The low-inertia moving coil driven precision diaphragm valve as described in claim 3, characterized in that: The connector is arranged in an inverted T shape, and the diaphragm is provided with a connecting groove that cooperates with and is fixed to the connector.

7. The low-inertia moving coil driven precision diaphragm valve as described in claim 2, characterized in that: A sealing ring is provided between the outer shell and the valve body.

8. The low-inertia moving-coil driven precision diaphragm valve as described in claim 2 or 7, characterized in that: The outer casing and the valve body are fixedly connected by bolts.

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