A cone face throttling type differential pressure control valve directly driven by a voice coil motor

Abstract

The application provides a voice coil motor direct drive diaphragm static seal cone throttling pressure difference control valve, which comprises a voice coil motor, a pressure difference control valve and a connecting mechanism; the pressure difference control valve comprises a pressure difference control valve body, a pressure difference control valve sleeve, a pressure difference control valve spool, a first sleeve fixing ring and a second sleeve fixing ring; the pressure difference control valve body is provided with a pressure difference control valve body middle part through hole, a first pressure control port flow channel, a water inlet flow channel, a second pressure control port flow channel and a water outlet flow channel; the pressure difference control valve sleeve, the first sleeve fixing ring and the second sleeve fixing ring are all located in the pressure difference control valve body middle part through hole; the pressure difference control valve sleeve is provided with a pressure difference control valve sleeve middle part through hole and a sealing ring groove on the outer side surface; the pressure difference control valve spool comprises a shaft section close to the voice coil motor side, a middle shaft section and a shaft section far away from the voice coil motor side. The technical scheme of the application solves the problems of large volume and poor mechanical properties of the traditional pressure difference control valve.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valves, and more particularly to a voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve. Background Technology

[0002] Water hydraulic technology uses natural freshwater, seawater, or tap water instead of mineral oil as the working medium in hydraulic systems. Like oil hydraulic technology, it belongs to the category of hydraulic transmission technology. Compared to traditional oil hydraulic transmission technology, water hydraulic transmission technology has the following advantages: 1. Eco-friendly and pollution-free; 2. Clean, hygienic, and highly safe; 3. Widely available and inexpensive; 4. Convenient maintenance and upkeep. As one of the core components of a hydraulic transmission system, the valve's performance has a significant impact on the entire system. Compared to the mature oil hydraulic transmission technology, water hydraulic transmission technology has a shorter development history. Furthermore, due to the unique physicochemical properties of water, water hydraulic transmission technology requires further research and development. Considering the physicochemical properties of water, it is essential to develop a water hydraulic differential pressure control valve with high control precision, small structural size, low leakage, and good mechanical properties.

[0003] The current hydraulic differential pressure control valves mainly have the following problems: 1. Poor control accuracy, with low resolution of valve opening degree in differential pressure control effect; 2. Poor mechanical characteristics, including high friction and small output force range and poor linearity of the actuator; 3. Poor sealing effect, usually in the form of dynamic seal, which is worse than static seal; 4. Large structural volume, making it difficult to install tightly with other equipment through transition blocks or other means. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve.

[0005] The technical means employed in this invention are as follows:

[0006] A voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve includes a voice coil motor, a differential pressure control valve, and a connecting mechanism;

[0007] The voice coil motor includes a coil mover and a magnetic stator. One end of the coil mover extends into the magnetic stator, and the end cap at the other end is located outside the magnetic stator.

[0008] The differential pressure control valve includes a differential pressure control valve body, a differential pressure control valve sleeve, a differential pressure control valve core, a first valve sleeve retaining ring, and a second valve sleeve retaining ring.

[0009] The differential pressure control valve body has a through hole in the middle of the valve body along the axial direction at the center. On one side, a first pressure control port flow channel, a water inlet flow channel, a second pressure control port flow channel and a water outlet flow channel are opened in sequence along the radial direction. On the other side, a first water outlet process hole and a second water outlet process hole are opened along the radial direction. An axial water outlet is opened along the axial direction with both ends connected to the first water outlet process hole and the second water outlet process hole respectively.

[0010] The differential pressure control valve sleeve, the first valve sleeve retaining ring, and the second valve sleeve retaining ring are all located within the through hole in the middle of the differential pressure control valve body. The differential pressure control valve sleeve has an axially oriented through hole at its center. Its outer surface is sequentially provided with protruding first sealing ring grooves, second sealing ring grooves, third sealing ring grooves, and fourth sealing ring grooves. A first pressure control port valve sleeve outer annular groove is formed between the first and second sealing ring grooves; an inlet valve sleeve outer annular groove is formed between the second and third sealing ring grooves; and a second pressure control port valve sleeve outer annular groove is formed between the third and fourth sealing ring grooves. The inner surface of the through hole in the middle of the differential pressure control valve sleeve... The valve is provided with an inner annular groove for the first pressure control port valve sleeve, an inner annular groove for the inlet valve sleeve, and an inner annular groove for the second pressure control port valve sleeve, which are respectively connected to the outer annular groove for the first pressure control port valve sleeve, the outer annular groove for the inlet valve sleeve, and the outer annular groove for the second pressure control port valve sleeve through a connecting hole; the flow channel for the first pressure control port, the flow channel for the inlet, and the flow channel for the second pressure control port are respectively connected to the outer annular groove for the first pressure control port valve sleeve, the outer annular groove for the inlet valve sleeve, and the outer annular groove for the second pressure control port valve sleeve; a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring are respectively installed in the first sealing ring groove, the second sealing ring groove, the third sealing ring groove, and the fourth sealing ring groove;

[0011] The first valve sleeve retaining ring and the second valve sleeve retaining ring are respectively located at both ends of the valve sleeve of the differential pressure control valve; the first valve sleeve retaining ring has a first valve sleeve retaining ring axial through hole at its center and a first valve sleeve retaining ring flow hole on its cylindrical surface; the second valve sleeve retaining ring has a second valve sleeve retaining ring axial through hole at its center and a second valve sleeve retaining ring flow hole on its cylindrical surface; the first valve sleeve retaining ring flow hole is used to connect the first valve sleeve retaining ring axial through hole to the first water outlet process hole; the second valve sleeve retaining ring flow hole is connected to the second water outlet process hole, the second valve sleeve retaining ring axial through hole, and the water outlet channel.

[0012] The differential pressure control valve core has a three-section stepped shaft structure: the shaft section closest to the voice coil motor has the smallest diameter, and the diameter of the middle shaft section is larger than that of the shaft section closest to the voice coil motor but smaller than that of the shaft section furthest from the voice coil motor.

[0013] The shaft section away from the voice coil motor is provided with a first annular groove and a second annular groove. The shoulder side between the first annular groove and the middle shaft section is a first throttling cone surface. The shoulder side between the first annular groove and the second annular groove is symmetrically provided with a second throttling cone surface and a third throttling cone surface. The shoulder side on the other side of the second annular groove is a fourth throttling cone surface.

[0014] The shaft section away from the voice coil motor is located in the through hole in the middle of the valve sleeve of the differential pressure control valve. The first annular groove and the second annular groove form a first pressure control chamber and a second pressure control chamber respectively between the first annular groove and the through hole in the middle of the valve sleeve of the differential pressure control valve.

[0015] The first throttling cone surface and the first pressure control cavity connect the inner annular groove of the first pressure control port valve sleeve with the axial through hole of the first valve sleeve fixing ring; the second throttling cone surface and the first pressure control cavity connect the inner annular groove of the first pressure control port valve sleeve with the inner annular groove of the inlet valve sleeve; the third throttling cone surface and the second pressure control cavity connect the inner annular groove of the inlet valve sleeve with the inner annular groove of the second pressure control port valve sleeve; the fourth throttling cone surface and the second pressure control cavity connect the inner annular groove of the second pressure control port valve sleeve with the axial through hole of the second valve sleeve fixing ring;

[0016] The connecting mechanism includes a voice coil motor connecting shaft, a voice coil motor connecting plate, a differential pressure control valve body connecting plate, and a diaphragm; the differential pressure control valve body connecting plate, the diaphragm, and the voice coil motor connecting plate are sequentially installed between the differential pressure control valve body and the magnetic stator; the magnetic stator has an axial through hole at its center, the voice coil motor connecting shaft is located in the axial through hole, one end is fixedly connected to the end cap of the coil mover, and the other end is fixedly connected to the shaft section near the voice coil motor.

[0017] Furthermore, the connecting mechanism also includes a connecting flange; the connecting flange is fixedly installed on the end of the differential pressure control valve body away from the voice coil motor by threads; the connecting flange has an axial through hole in the middle of the connecting flange on the side near the voice coil motor, and a threaded hole in the middle of the connecting flange on the side away from the voice coil motor; the two ends of the axial through hole in the middle of the connecting flange are respectively connected to the axial through hole of the second valve sleeve fixing ring and the threaded hole in the middle of the connecting flange; the return water flowing into the axial through hole of the second valve sleeve fixing ring can also be directly discharged through the axial through hole in the middle of the connecting flange and the threaded hole in the middle of the connecting flange.

[0018] Furthermore, the differential pressure control valve, the voice coil motor connecting shaft, the voice coil motor connecting plate, the differential pressure control valve body connecting plate, and the connecting flange are all made of stainless steel, and the diaphragm is made of flexible material or hyperelastic material.

[0019] Furthermore, a countersunk through hole for the differential pressure control valve body is provided on the end face of the valve body away from the voice coil motor.

[0020] Furthermore, the small-diameter end of the first throttling cone faces the first annular groove, the small-diameter ends of the second and third throttling cones face the first annular groove and the second annular groove, respectively, and the small-diameter end of the fourth throttling cone faces the second annular groove.

[0021] Furthermore, the differential pressure control valve body has a circular groove on the end face near the voice coil motor.

[0022] The differential pressure control valve body connecting plate has an annular boss, a circular groove, and a central through hole on the end face near the voice coil motor, and a circular boss on the end face away from the voice coil motor. The central through hole is used to install the central shaft section. The circular boss is installed in the circular groove of the differential pressure control valve body.

[0023] The voice coil motor connecting plate has a circular groove and a central through hole on its end face near the voice coil motor, and a first circular groove, a second circular groove, a countersunk hole, and an annular groove on its end face away from the voice coil motor. The magnetic stator is mounted in the circular groove of the voice coil motor connecting plate. The central through hole of the voice coil motor connecting plate is used to install the voice coil motor connecting shaft. The countersunk hole of the voice coil motor connecting plate is used to install bolts connecting the voice coil motor connecting plate and the magnetic stator.

[0024] The diaphragm has an axial through hole at its center, and an annular protrusion is provided on the side surface facing the voice coil motor connecting plate. The axial through hole is used to install the shaft section near the voice coil motor. The side of the diaphragm facing the voice coil motor connecting plate is installed in the first circular groove of the voice coil motor connecting plate, and the annular protrusion is installed in the annular groove of the voice coil motor connecting plate. The side of the diaphragm facing the differential pressure control valve body connecting plate is installed in the annular boss of the differential pressure control valve body connecting plate.

[0025] The second circular groove on the voice coil motor connecting plate and the circular groove on the valve body connecting plate of the differential pressure control valve are used to provide space for the diaphragm to deform.

[0026] The differential pressure control valve body has a threaded hole on the end face near the voice coil motor. The voice coil motor connecting plate and the differential pressure control valve body connecting plate have external through holes corresponding to the threaded hole. The voice coil motor connecting plate, the differential pressure control valve body connecting plate, and the differential pressure control valve body connecting plate are connected by screws that pass through the external through holes of the voice coil motor connecting plate, the external through holes of the differential pressure control valve body connecting plate, and the threaded hole in sequence.

[0027] Furthermore, the circular boss of the differential pressure control valve body connecting plate is threadedly installed into the circular groove of the differential pressure control valve body; the magnetic stator is threadedly installed into the circular groove of the voice coil motor connecting plate; the diaphragm is installed between the voice coil motor connecting plate and the differential pressure control valve connecting plate; the two sides of the diaphragm are in contact with the end faces of the voice coil motor connecting shaft and the middle shaft section, respectively.

[0028] Furthermore, the diameter of the axial through hole in the diaphragm is slightly smaller than that of the central shaft section and the voice coil motor connecting shaft.

[0029] Furthermore, a fifth sealing ring is installed between the differential pressure control valve body and the differential pressure control valve body connecting plate; a sixth sealing ring is installed between the connecting flange and the differential pressure control valve body; a differential pressure control valve body sealing ring groove for installing the fifth sealing ring is also provided on the end face of the differential pressure control valve body near the voice coil motor; and a connecting flange annular sealing ring groove for installing the sixth sealing ring is provided on the end face of the connecting flange near the voice coil motor.

[0030] Furthermore, the middle shaft segment passes sequentially through the axial through hole of the first valve sleeve fixing ring and the valve body connecting plate of the differential pressure control valve; the shaft segment near the voice coil motor passes sequentially through the axial through hole of the first valve sleeve fixing ring, the valve body connecting plate of the differential pressure control valve, the diaphragm and the voice coil motor connecting plate and is connected to the voice coil motor connecting shaft.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve provided by the present invention has the valve core directly driven by the voice coil motor, which gives the differential pressure control valve the advantages of fast dynamic response, high control accuracy and large displacement stroke.

[0033] 2. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve provided by the present invention adopts diaphragm static seal and sealing ring end face static seal as the external leakage sealing form, which has good sealing effect, low friction, certain centering, and good mechanical properties.

[0034] 3. The voice coil motor direct-drive diaphragm static sealing conical throttling differential pressure control valve provided by the present invention has a throttling conical surface set on the valve core, which reduces the processing cost, ensures the radial hydraulic pressure balance of the valve core, and improves the mechanical characteristics and control accuracy.

[0035] 4. The voice coil motor direct-drive diaphragm static seal cone throttling differential pressure control valve provided by the present invention has adjustable dimensional parameters of the throttling cone on the valve core, thereby improving the control range of the differential pressure control valve.

[0036] 5. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve provided by the present invention uses a voice coil motor connecting plate and a differential pressure control valve connecting plate for connection, and a countersunk hole is opened on the valve body of the differential pressure control valve, which reduces the volume of the overall structure and makes it easier to install.

[0037] 6. The voice coil motor direct-drive diaphragm static sealing conical throttling differential pressure control valve provided by the present invention has a sealing groove on the valve sleeve to accommodate the sealing ring, which improves its sealing performance and separates different pressure zones, thereby improving the control effect.

[0038] 7. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve provided by the present invention has a central threaded hole on the connecting flange, which can switch the drainage mode by connecting different accessories, thus expanding its application range.

[0039] Based on the above reasons, this invention can be widely promoted in the field of water hydraulic transmission systems. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve of the present invention.

[0042] Figure 2 This is a schematic diagram of the differential pressure control valve core and the differential pressure control valve sleeve structure of the present invention.

[0043] Figure 3This is a schematic diagram of the voice coil motor connecting plate structure described in this invention.

[0044] Figure 4 This is a schematic diagram of the valve body connecting plate structure of the differential pressure control valve described in this invention.

[0045] Figure 5 This is a schematic diagram of the valve body structure of the differential pressure control valve described in this invention.

[0046] Figure 6 This is a schematic diagram illustrating the working principle of the voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve described in this invention.

[0047] In the diagram: 1. Voice coil motor; 2. Differential pressure control valve; 3. Connecting mechanism; 4. Coil mover; 5. Magnetic stator; 6. Differential pressure control valve body; 7. Differential pressure control valve sleeve; 8. Differential pressure control valve core; 9. First valve sleeve retaining ring; 10. Second valve sleeve retaining ring; 11. First sealing ring; 12. Second sealing ring; 13. Third sealing ring; 14. Fourth sealing ring; 15. Through hole in the middle of the differential pressure control valve body; 16. Circular groove in the differential pressure control valve body; 17. Groove of the sealing ring in the differential pressure control valve body; 18. Axial outlet; 19. First pressure control port flow channel; 20. Inlet flow channel; 21. Second pressure control port flow channel; 22. Outlet flow channel; 3. Countersunk through hole in differential pressure control valve body; 24. First water outlet process hole; 25. Second water outlet process hole; 26. Through hole in the middle of differential pressure control valve sleeve; 27. First sealing ring groove; 28. Second sealing ring groove; 29. ​​Third sealing ring groove; 30. Fourth sealing ring groove; 31. Annular groove on the outer side of the first pressure control port valve sleeve; 32. Annular groove on the outer side of the inlet valve sleeve; 33. Annular groove on the outer side of the second pressure control port valve sleeve; 34. Annular groove on the inner side of the first pressure control port valve sleeve; 35. Annular groove on the inner side of the inlet valve sleeve; 36. Annular groove on the inner side of the second pressure control port valve sleeve; 37. Shaft section near the voice coil motor; 38. Middle shaft section; 39. Shaft section away from the voice coil motor. Shaft segment; 40, First pressure control chamber; 41, Second pressure control chamber; 42, First throttling cone surface; 43, Second throttling cone surface; 44, Third throttling cone surface; 45, Fourth throttling cone surface; 46, Axial through hole of second valve sleeve fixing ring; 47, Flow hole of second valve sleeve fixing ring; 48, Axial through hole of first valve sleeve fixing ring; 49, Flow hole of first valve sleeve fixing ring; 50, Voice coil motor connecting shaft; 51, Voice coil motor connecting plate; 52, Differential pressure control valve body connecting plate; 53, Diaphragm; 54, Connecting flange; 55, Fifth sealing ring; 56, Sixth sealing ring; 57, Circular groove of voice coil motor connecting plate; 58, Through hole in the middle of voice coil motor connecting plate; 59, Voice coil motor connecting plate; 60. External through hole of voice coil motor connecting plate; 61. First circular groove of voice coil motor connecting plate; 62. Second circular groove of voice coil motor connecting plate; 63. Countersunk hole of voice coil motor connecting plate; 64. Annular groove of voice coil motor connecting plate; 65. Annular boss of valve body connecting plate of differential pressure control valve; 66. Circular groove of valve body connecting plate of differential pressure control valve; 67. Through hole in the middle of valve body connecting plate of differential pressure control valve; 68. External through hole of valve body connecting plate of differential pressure control valve; 69. Circular boss of valve body connecting plate of differential pressure control valve; 70. Axial through hole of diaphragm; 71. Annular protrusion of diaphragm; 72. Annular sealing ring groove of connecting flange; 73. Axial through hole in the middle of connecting flange; 74. Threaded hole in the middle of connecting flange. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0053] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0054] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0055] Example 1

[0056] like Figure 1-6 As shown, the present invention provides a voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve, including a voice coil motor 1, a differential pressure control valve 2, and a connecting mechanism 3;

[0057] The voice coil motor 1 includes a coil mover 4 and a magnetic stator 5. One end of the coil mover 4 extends into the magnetic stator 5, and the end cap of the other end is located outside the magnetic stator 5.

[0058] The differential pressure control valve 2 includes a differential pressure control valve body 6, a differential pressure control valve sleeve 7, a differential pressure control valve core 8, a first valve sleeve fixing ring 9, and a second valve sleeve fixing ring 10.

[0059] The differential pressure control valve body 6 has a cuboid structure with a central through hole 15 along the axial direction. On one side, a first pressure control port flow channel 19, an inlet flow channel 20, a second pressure control port flow channel 21, and an outlet flow channel 22 are sequentially opened along the radial direction. On the other side, a first outlet process hole 24 and a second outlet process hole 25 are opened along the radial direction, and an axial outlet 18 is opened along the axial direction, with both ends connected to the first outlet process hole 24 and the second outlet process hole 25 respectively.

[0060] The differential pressure control valve sleeve 7, the first valve sleeve retaining ring 9, and the second valve sleeve retaining ring 10 are all located within the through hole 15 in the middle of the differential pressure control valve body. The differential pressure control valve sleeve 7 has a cylindrical structure with a through hole 26 in the middle of the valve sleeve axially at its center. The outer side is provided with a first sealing ring groove 27, a second sealing ring groove 28, a third sealing ring groove 29, and a fourth sealing ring groove 30 arranged sequentially at intervals. A first pressure control port is formed between the first sealing ring groove 27 and the second sealing ring groove 28. A side annular groove 31 is formed between the second sealing ring groove 28 and the third sealing ring groove 29, and a second pressure control port valve sleeve outer annular groove 33 is formed between the third sealing ring groove 29 and the fourth sealing ring groove 30. The inner surface of the through hole 26 in the middle of the differential pressure control valve sleeve is provided with a first pressure control valve sleeve outer annular groove 31, an inlet valve sleeve outer annular groove 32, and a second pressure control port valve sleeve outer annular groove 33, which are respectively connected to the first pressure control port valve sleeve outer annular groove 31, the inlet valve sleeve outer annular groove 32, and the second pressure control port valve sleeve outer annular groove 33 through connecting holes. The valve sleeve 7 has an inner annular groove 34, an inner annular groove 35, and an inner annular groove 36. The inner annular grooves of the differential pressure control valve sleeve 7 connect the flow channels to the pressure control chamber and cooperate with the throttling cone surface on the differential pressure control valve core 8 to accurately regulate the flow area, thereby achieving differential pressure control. The first pressure control port flow channel 19, the inlet flow channel 20, and the second pressure control port flow channel 21 are respectively connected to the outer annular groove 31 of the first pressure control port valve sleeve, the... The annular groove 32 on the outer side of the inlet valve sleeve and the annular groove 33 on the outer side of the second pressure control valve sleeve are connected; the first sealing ring 11, the second sealing ring 12, the third sealing ring 13, and the fourth sealing ring 14 are respectively installed in the first sealing ring groove 27, the second sealing ring groove 28, the third sealing ring groove 29, and the fourth sealing ring groove 30; the sealing structure formed by the groove and the sealing ring can seal the valve sleeve 7 of the differential pressure control valve and the through hole 15 in the middle of the valve body of the differential pressure control valve, and can also separate different pressure zones, thus improving the control effect;

[0061] The first valve sleeve fixing ring 9 and the second valve sleeve fixing ring 10 are respectively located at both ends of the differential pressure control valve sleeve 7; the first valve sleeve fixing ring 9 and the second valve sleeve fixing ring 10 are pressed and fixed to the differential pressure control valve sleeve 7 by other structures at both ends of the differential pressure control valve 2, without the need for other connecting parts; the first valve sleeve fixing ring 9 has a first valve sleeve fixing ring axial through hole 48 in the center and a first valve sleeve fixing ring flow hole 49 on the cylindrical surface; the second valve sleeve fixing ring 10 has a second valve sleeve fixing ring axial through hole 46 in the center and a second valve sleeve fixing ring flow hole 47 on the cylindrical surface; the first valve sleeve fixing ring flow hole 49 is used to connect the first valve sleeve fixing ring axial through hole 48 with the first water outlet process hole 24; the second valve sleeve fixing ring flow hole 47 is connected to the second water outlet process hole 25, the second valve sleeve fixing ring axial through hole 46 and the water outlet channel 22 respectively;

[0062] The first valve sleeve retaining ring axial through hole 48 and the second valve sleeve retaining ring axial through hole 46 are used to provide space for the valve core 8 of the differential pressure control valve to move axially, and to allow the return water in the valve sleeve 7 of the differential pressure control valve to flow into the second valve sleeve retaining ring axial through hole 46 and the first valve sleeve retaining ring axial through hole 48.

[0063] The return water flowing into the first valve sleeve fixing ring 9 inside the differential pressure control valve sleeve 7 will flow into the first valve sleeve fixing ring flow hole 49 through the axial through hole 48 of the first valve sleeve fixing ring, and then flow into the water outlet channel 22 through the first water outlet process hole 24, the axial water outlet 18, the second water outlet process hole 25, and the second valve sleeve fixing ring flow hole 47 in sequence.

[0064] The return water flowing into the second valve sleeve fixing ring 10 inside the differential pressure control valve sleeve 7 will flow into the second valve sleeve fixing ring flow hole 47 through the axial through hole 46 of the second valve sleeve fixing ring, and then flow into the water outlet channel 22.

[0065] The outlet channel 22 is used to allow the return water from the differential pressure control valve 2 to flow back to the water tank or be discharged directly.

[0066] The differential pressure control valve core 8 has a three-section stepped shaft structure: the shaft section 37 near the voice coil motor has the smallest diameter, and the middle shaft section 38 has a larger diameter than the shaft section 37 near the voice coil motor and a smaller diameter than the shaft section 39 far from the voice coil motor.

[0067] The shaft section 39 away from the voice coil motor is provided with a first annular groove and a second annular groove. The shoulder side between the first annular groove and the middle shaft section 38 is a first throttling cone surface 42. The shoulder side between the first annular groove and the second annular groove is symmetrically provided with a second throttling cone surface 43 and a third throttling cone surface 44. The shoulder side on the other side of the second annular groove is a fourth throttling cone surface 45.

[0068] The shaft section 39 away from the voice coil motor is located in the through hole 26 in the middle of the valve sleeve of the differential pressure control valve. The first annular groove and the second annular groove form a first pressure control cavity 40 and a second pressure control cavity 41 between the first annular groove and the through hole 26 in the middle of the valve sleeve of the differential pressure control valve, respectively.

[0069] The first throttling cone surface 42 and the first pressure control cavity 40 connect the inner annular groove 34 of the first pressure control port valve sleeve with the axial through hole 48 of the first valve sleeve fixing ring; the second throttling cone surface 43 and the first pressure control cavity 40 connect the inner annular groove 34 of the first pressure control port valve sleeve with the inner annular groove 35 of the inlet valve sleeve; the third throttling cone surface 44 and the second pressure control cavity 41 connect the inner annular groove 35 of the inlet valve sleeve with the inner annular groove 36 of the second pressure control port valve sleeve; the fourth throttling cone surface 45 and the second pressure control cavity 41 connect the inner annular groove 36 of the second pressure control port valve sleeve with the axial through hole 46 of the second valve sleeve fixing ring;

[0070] The connecting mechanism 3 includes a voice coil motor connecting shaft 50, a voice coil motor connecting plate 51, a differential pressure control valve body connecting plate 52, and a diaphragm 53. Both the voice coil motor connecting plate 51 and the differential pressure control valve body connecting plate 52 are rectangular plates. The diaphragm 53 has a circular structure. The differential pressure control valve body connecting plate 52, the diaphragm 53, and the voice coil motor connecting plate 51 are sequentially installed between the differential pressure control valve body 6 and the magnetic stator 5. The magnetic stator 5 has an axial through hole at its center, and the voice coil motor connecting shaft 50 is located within this axial through hole, with one end fixed to the end cap of the coil mover 4 via a threaded connection. The other end is fixedly connected to the shaft section 37 near the voice coil motor via a thread; when the voice coil motor 1 is energized, the coil mover 4 can move linearly along the axial direction of the voice coil motor 1, thereby driving the differential pressure control valve core 8 to move linearly along the axial direction through the voice coil motor connecting shaft 50; by driving the differential pressure control valve core 8 to move axially through the voice coil motor 1, the opening of the throttling surface between the throttling cone surface and the inner annular groove on the differential pressure control valve core 8 can be changed, thereby changing the flow area (liquid resistance), which is equivalent to two symmetrical A-type hydraulic half-bridges, realizing the differential pressure adjustment of the flow channels of the two pressure control ports.

[0071] Furthermore, the inner annular groove 34 of the first pressure control port valve sleeve, the inner annular groove 35 of the inlet valve sleeve, and the inner annular groove 36 of the second pressure control port valve sleeve are respectively positioned to correspond to the outer annular groove 31 of the first pressure control port valve sleeve, the outer annular groove 32 of the inlet valve sleeve, and the outer annular groove 33 of the second pressure control port valve sleeve.

[0072] Furthermore, the connecting mechanism 3 also includes a connecting flange 54; the connecting flange 54 is fixedly installed on the end of the differential pressure control valve body 6 away from the voice coil motor 1 by threads; the connecting flange 54 has a stepped shaft structure, with an axial through hole 72 in the middle of the connecting flange on the side closer to the voice coil motor 1, and a threaded hole 73 in the middle of the connecting flange on the side away from the voice coil motor 1. The two ends of the axial through hole 72 in the middle of the connecting flange are respectively connected to the axial through hole 46 of the second valve sleeve fixing ring and the threaded hole 73 in the middle of the connecting flange. The return water flowing into the axial through hole 46 of the second valve sleeve fixing ring can also be directly discharged through the axial through hole 72 and the threaded hole 73 in the middle of the connecting flange. The water outlet channel 22 and the connecting flange 54 can provide multiple drainage methods, expanding the application range. The axial through hole 72 in the middle of the connecting flange can provide space for the axial movement of the second valve sleeve fixing ring 10.

[0073] This invention can be used on or underwater. When used on water, the voice coil motor direct-drive plate diaphragm static seal differential pressure control valve can be installed on the controlled equipment or transition block via a mounting flange. Then, a screw plug is installed on the threaded hole 73 in the middle of the connecting flange, so that the return water of the differential pressure control valve 2 can only be discharged to the water tank through the outlet flow channel 22. When used underwater, the threaded hole 73 in the middle of the connecting flange does not need to be blocked, and the return water of the differential pressure control valve 2 can be directly discharged to the external water through the threaded hole 73 in the middle of the connecting flange and the outlet flow channel 22 respectively.

[0074] Taking water use as an example, after the voice coil motor direct drive plate diaphragm static seal differential pressure control valve is installed, a screw plug is installed on the threaded hole 73 in the middle of the connecting flange. When the present invention is working, the first pressure control port flow channel 19, the inlet flow channel 20, the second pressure control port flow channel 21 and the outlet flow channel 22 on the valve body 6 of the differential pressure control valve are respectively connected to the first artificial muscle of the artificial muscle joint, the pump station outlet, the second artificial muscle of the artificial muscle joint and the water tank.

[0075] Water supplied by the pumping station can flow into the annular groove 32 on the outside of the inlet valve sleeve through the inlet channel 20, and then into the annular groove 35 on the inside of the inlet valve sleeve through the connecting hole, thereby flowing into the interior of the differential pressure control valve sleeve 7. Then, it flows to the first pressure control chamber 40 and the second pressure control chamber 41 through the second throttling cone surface 43 and the third throttling cone surface 44, respectively. The annular groove 34 on the inside of the first pressure control valve sleeve and the annular groove 36 on the inside of the second pressure control valve sleeve can allow water from the first pressure control chamber 40 and the second pressure control chamber 41 to flow to the first pressure control channel 19 and the second pressure control channel 21 through the annular groove 31 on the outside of the first pressure control valve sleeve and the annular groove 33 on the outside of the second pressure control valve sleeve, respectively, thereby providing the first artificial muscle and the second artificial muscle of the artificial muscle joint.

[0076] The pressure difference between the first and second artificial muscles in the artificial muscle joint can be measured by pressure sensors and uploaded to the host computer. When it is necessary to adjust the pressure difference of the artificial muscle joint, the host computer can change the voltage acting on the voice coil motor 1, which in turn pushes the valve core 8 of the pressure difference control valve through the voice coil motor connecting shaft 50, changing the valve opening (i.e., the opening of the throttling surface between the throttling cone surface and the inner annular groove on the valve core 8 of the pressure difference control valve), thereby changing the equivalent fluid resistance of different throttling surfaces in the pressure difference control valve, and realizing the adjustment of the pressure difference of the artificial muscle joint. At the same time, the pressure difference control valve 2 can also be connected to only one drive unit, and only one of the first pressure control port flow channel 19 and the second pressure control port flow channel 21 is used, while the other can be blocked.

[0077] Furthermore, no sealing ring is installed on the valve core 8 of the differential pressure control valve, which can reduce friction and improve the differential pressure control effect.

[0078] Furthermore, the external leakage sealing method of the differential pressure control valve 2 is diaphragm static sealing and end face static sealing.

[0079] Furthermore, the dimensions of the four throttling cones on the valve core 8 of the differential pressure control valve can be adjusted according to the requirements of the hydraulic system.

[0080] Furthermore, the differential pressure control valve 2, the voice coil motor connecting shaft 50, the voice coil motor connecting plate 51, the differential pressure control valve body connecting plate 52, and the connecting flange 54 are all made of stainless steel, and the diaphragm 53 is made of flexible material or superelastic material.

[0081] Furthermore, a countersunk through hole 23 for the differential pressure control valve body 6 is provided on the end face away from the voice coil motor 1, which can be used for plate mounting of the differential pressure control valve body 6, that is, the differential pressure control valve body 6 is mounted on the controlled equipment or transition block by mounting bolts.

[0082] Furthermore, the small-diameter end of the first throttling cone 42 faces the first annular groove, the small-diameter ends of the second throttling cone 43 and the third throttling cone 44 face the first annular groove and the second annular groove respectively, and the small-diameter end of the fourth throttling cone 45 faces the second annular groove.

[0083] Furthermore, the differential pressure control valve body 6 has a circular groove 16 on the end face near the voice coil motor 1;

[0084] The differential pressure control valve body connecting plate 52 has an annular boss 64, a circular groove 65, and a central through hole 66 on its end face near the voice coil motor 1, and a circular boss 68 on its end face away from the voice coil motor 1. The central through hole 66 is used to install the central shaft section 38. The circular boss 68 is installed in the circular groove 16 of the differential pressure control valve body.

[0085] The voice coil motor connecting plate 51 has a circular groove 57 and a central through hole 58 on its end face near the voice coil motor 1, and a first circular groove 60, a second circular groove 61, a countersunk hole 62, and an annular groove 63 on its end face away from the voice coil motor 1. The magnetic stator 5 is mounted in the circular groove 57 of the voice coil motor connecting plate. The central through hole 58 of the voice coil motor connecting plate is used to install the voice coil motor connecting shaft 50. The countersunk hole 62 of the voice coil motor connecting plate is used to install bolts connecting the voice coil motor connecting plate 51 and the magnetic stator 5.

[0086] The diaphragm 53 has an axial through hole 69 at its center and an annular protrusion 70 on its surface facing the voice coil motor connecting plate 51. The axial through hole 69 is used to install the shaft section 37 near the voice coil motor. The side of the diaphragm 53 facing the voice coil motor connecting plate 51 is installed in the first circular groove 60 of the voice coil motor connecting plate, and the annular protrusion 70 is installed in the annular groove 63 of the voice coil motor connecting plate. The side of the diaphragm 53 facing the differential pressure control valve body connecting plate 52 is installed in the annular boss 64 of the differential pressure control valve body connecting plate.

[0087] When the valve core 8 of the differential pressure control valve moves axially, the diaphragm 53 will also deform. The second circular groove 61 of the voice coil motor connecting plate and the circular groove 65 of the valve body connecting plate of the differential pressure control valve are used to provide space for the deformation of the diaphragm 53.

[0088] The differential pressure control valve body 6 has a threaded hole on its end face near the voice coil motor 1. The voice coil motor connecting plate 51 and the differential pressure control valve body connecting plate 52 have external through holes 59 and 67 corresponding to the threaded hole, respectively. The voice coil motor connecting plate 51, the differential pressure control valve body connecting plate 52, and the threaded hole are connected to the differential pressure control valve body 6 by screws that pass through the external through holes 59, 67, and threaded holes in sequence.

[0089] The connection mechanism 3 and the differential pressure control valve body 6 are provided with structures such as circular grooves, annular grooves and annular bosses that can cooperate with each other, which can ensure the stability of installation.

[0090] Furthermore, the circular boss 68 of the differential pressure control valve body connecting plate is threaded onto the circular groove 16 of the differential pressure control valve body, thereby allowing the differential pressure control valve body connecting plate 52 to be installed on the differential pressure control valve body 6 and ensuring radial installation stability; the magnetic stator 5 is threaded onto the circular groove 57 of the voice coil motor connecting plate; the diaphragm 53 is installed between the voice coil motor connecting plate 51 and the differential pressure control valve connecting plate 52; the two sides of the diaphragm 53 are in contact with the end faces of the voice coil motor connecting shaft 50 and the middle shaft section 38, respectively.

[0091] Furthermore, the diameter of the axial through hole 69 of the diaphragm is slightly smaller than that of the middle shaft section 38 and the voice coil motor connecting shaft 50. The coil mover 4 is directly connected to the end of the differential pressure control valve core 8 that passes through the diaphragm 53 through the voice coil motor connecting shaft 50, thereby fixing the diaphragm 53.

[0092] Furthermore, a fifth sealing ring 55 is installed between the differential pressure control valve body 6 and the differential pressure control valve body connecting plate 52; a sixth sealing ring 56 is installed between the connecting flange 54 and the differential pressure control valve body 6; a differential pressure control valve body sealing ring groove 17 for installing the fifth sealing ring 55 is also provided on the end face of the differential pressure control valve body 6 near the voice coil motor 1; a connecting flange annular sealing ring groove 71 for installing the sixth sealing ring 56 is provided on the end face of the connecting flange 54 near the voice coil motor 1.

[0093] Furthermore, the voice coil motor connecting shaft 50 is a cylindrical structure, with an external thread at one end for connecting to the end cap of the coil mover 4, and a threaded hole at the other end for connecting to the side shaft section 37 near the voice coil motor.

[0094] Furthermore, both the first valve sleeve retaining ring 9 and the second valve sleeve retaining ring 10 are circular ring structures.

[0095] Furthermore, the middle shaft segment 38 passes sequentially through the axial through hole 48 of the first valve sleeve fixing ring and the valve body connecting plate 52 of the differential pressure control valve; the shaft segment 37 near the voice coil motor passes sequentially through the axial through hole 48 of the first valve sleeve fixing ring, the valve body connecting plate 52 of the differential pressure control valve, the diaphragm 53 and the voice coil motor connecting plate 51 and is connected to the voice coil motor connecting shaft 50.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve, characterized in that, Includes a voice coil motor, a differential pressure control valve, and a connecting mechanism; The voice coil motor includes a coil mover and a magnetic stator. One end of the coil mover extends into the magnetic stator, and the end cap at the other end is located outside the magnetic stator. The differential pressure control valve includes a differential pressure control valve body, a differential pressure control valve sleeve, a differential pressure control valve core, a first valve sleeve retaining ring, and a second valve sleeve retaining ring. The differential pressure control valve body has a through hole in the middle of the valve body along the axial direction at the center. On one side, a first pressure control port flow channel, a water inlet flow channel, a second pressure control port flow channel and a water outlet flow channel are opened in sequence along the radial direction. On the other side, a first water outlet process hole and a second water outlet process hole are opened along the radial direction. An axial water outlet is opened along the axial direction with both ends connected to the first water outlet process hole and the second water outlet process hole respectively. The differential pressure control valve sleeve, the first valve sleeve retaining ring, and the second valve sleeve retaining ring are all located within the through hole in the middle of the differential pressure control valve body. The differential pressure control valve sleeve has an axially oriented through hole at its center. Its outer surface is sequentially provided with protruding first sealing ring grooves, second sealing ring grooves, third sealing ring grooves, and fourth sealing ring grooves. A first pressure control port valve sleeve outer annular groove is formed between the first and second sealing ring grooves; an inlet valve sleeve outer annular groove is formed between the second and third sealing ring grooves; and a second pressure control port valve sleeve outer annular groove is formed between the third and fourth sealing ring grooves. The inner surface of the through hole in the middle of the differential pressure control valve sleeve... The valve is provided with an inner annular groove for the first pressure control port valve sleeve, an inner annular groove for the inlet valve sleeve, and an inner annular groove for the second pressure control port valve sleeve, which are respectively connected to the outer annular groove for the first pressure control port valve sleeve, the outer annular groove for the inlet valve sleeve, and the outer annular groove for the second pressure control port valve sleeve through a connecting hole; the flow channel for the first pressure control port, the flow channel for the inlet, and the flow channel for the second pressure control port are respectively connected to the outer annular groove for the first pressure control port valve sleeve, the outer annular groove for the inlet valve sleeve, and the outer annular groove for the second pressure control port valve sleeve; a first sealing ring, a second sealing ring, a third sealing ring, and a fourth sealing ring are respectively installed in the first sealing ring groove, the second sealing ring groove, the third sealing ring groove, and the fourth sealing ring groove; The first valve sleeve retaining ring and the second valve sleeve retaining ring are respectively located at both ends of the valve sleeve of the differential pressure control valve; the first valve sleeve retaining ring has a first valve sleeve retaining ring axial through hole at its center and a first valve sleeve retaining ring flow hole on its cylindrical surface; the second valve sleeve retaining ring has a second valve sleeve retaining ring axial through hole at its center and a second valve sleeve retaining ring flow hole on its cylindrical surface; the first valve sleeve retaining ring flow hole is used to connect the first valve sleeve retaining ring axial through hole to the first water outlet process hole; the second valve sleeve retaining ring flow hole is connected to the second water outlet process hole, the second valve sleeve retaining ring axial through hole, and the water outlet channel. The differential pressure control valve core has a three-section stepped shaft structure: the shaft section closest to the voice coil motor has the smallest diameter, and the diameter of the middle shaft section is larger than that of the shaft section closest to the voice coil motor but smaller than that of the shaft section furthest from the voice coil motor. The shaft section away from the voice coil motor is provided with a first annular groove and a second annular groove. The shoulder side between the first annular groove and the middle shaft section is a first throttling cone surface. The shoulder side between the first annular groove and the second annular groove is symmetrically provided with a second throttling cone surface and a third throttling cone surface. The shoulder side on the other side of the second annular groove is a fourth throttling cone surface. The shaft section away from the voice coil motor is located in the through hole in the middle of the valve sleeve of the differential pressure control valve. The first annular groove and the second annular groove form a first pressure control chamber and a second pressure control chamber respectively between the first annular groove and the through hole in the middle of the valve sleeve of the differential pressure control valve. The first throttling cone surface and the first pressure control cavity connect the inner annular groove of the first pressure control port valve sleeve with the axial through hole of the first valve sleeve fixing ring; the second throttling cone surface and the first pressure control cavity connect the inner annular groove of the first pressure control port valve sleeve with the inner annular groove of the inlet valve sleeve; the third throttling cone surface and the second pressure control cavity connect the inner annular groove of the inlet valve sleeve with the inner annular groove of the second pressure control port valve sleeve; the fourth throttling cone surface and the second pressure control cavity connect the inner annular groove of the second pressure control port valve sleeve with the axial through hole of the second valve sleeve fixing ring; The connecting mechanism includes a voice coil motor connecting shaft, a voice coil motor connecting plate, a differential pressure control valve body connecting plate, and a diaphragm; the differential pressure control valve body connecting plate, the diaphragm, and the voice coil motor connecting plate are sequentially installed between the differential pressure control valve body and the magnetic stator; the magnetic stator has an axial through hole at its center, the voice coil motor connecting shaft is located in the axial through hole, one end is fixedly connected to the end cap of the coil mover, and the other end is fixedly connected to the shaft section near the voice coil motor.

2. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 1, characterized in that, The connecting mechanism also includes a connecting flange; the connecting flange is fixedly installed on the end of the differential pressure control valve body away from the voice coil motor by threads; the connecting flange has an axial through hole in the middle of the connecting flange on the side near the voice coil motor, and a threaded hole in the middle of the connecting flange on the side away from the voice coil motor; the two ends of the axial through hole in the middle of the connecting flange are respectively connected to the axial through hole of the second valve sleeve fixing ring and the threaded hole in the middle of the connecting flange; the return water flowing into the axial through hole of the second valve sleeve fixing ring can also be directly discharged through the axial through hole in the middle of the connecting flange and the threaded hole in the middle of the connecting flange.

3. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 2, characterized in that, The differential pressure control valve, the voice coil motor connecting shaft, the voice coil motor connecting plate, the differential pressure control valve body connecting plate, and the connecting flange are all made of stainless steel, and the diaphragm is made of flexible material.

4. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 1, characterized in that, The differential pressure control valve body has a countersunk through hole on the end face away from the voice coil motor.

5. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 1, characterized in that, The small-diameter end of the first throttling cone faces the first annular groove, the small-diameter ends of the second and third throttling cones face the first annular groove and the second annular groove, respectively, and the small-diameter end of the fourth throttling cone faces the second annular groove.

6. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 1, characterized in that, The differential pressure control valve body has a circular groove on the end face near the voice coil motor. The differential pressure control valve body connecting plate has an annular boss, a circular groove, and a central through hole on the end face near the voice coil motor, and a circular boss on the end face away from the voice coil motor. The central through hole is used to install the central shaft section. The circular boss is installed in the circular groove of the differential pressure control valve body. The voice coil motor connecting plate has a circular groove and a central through hole on its end face near the voice coil motor, and a first circular groove, a second circular groove, a countersunk hole, and an annular groove on its end face away from the voice coil motor. The magnetic stator is mounted in the circular groove of the voice coil motor connecting plate. The central through hole of the voice coil motor connecting plate is used to install the voice coil motor connecting shaft. The countersunk hole of the voice coil motor connecting plate is used to install bolts connecting the voice coil motor connecting plate and the magnetic stator. The diaphragm has an axial through hole at its center, and an annular protrusion is provided on the side surface facing the voice coil motor connecting plate. The axial through hole is used to install the shaft section near the voice coil motor. The side of the diaphragm facing the voice coil motor connecting plate is installed in the first circular groove of the voice coil motor connecting plate, and the annular protrusion is installed in the annular groove of the voice coil motor connecting plate. The side of the diaphragm facing the differential pressure control valve body connecting plate is installed in the annular boss of the differential pressure control valve body connecting plate. The second circular groove on the voice coil motor connecting plate and the circular groove on the valve body connecting plate of the differential pressure control valve are used to provide space for the diaphragm to deform. The differential pressure control valve body has a threaded hole on the end face near the voice coil motor. The voice coil motor connecting plate and the differential pressure control valve body connecting plate have external through holes corresponding to the threaded hole. The voice coil motor connecting plate, the differential pressure control valve body connecting plate, and the differential pressure control valve body connecting plate are connected by screws that pass through the external through holes of the voice coil motor connecting plate, the external through holes of the differential pressure control valve body connecting plate, and the threaded hole in sequence.

7. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 6, characterized in that, The circular boss of the differential pressure control valve body connecting plate is threadedly installed into the circular groove of the differential pressure control valve body; the magnetic stator is threadedly installed into the circular groove of the voice coil motor connecting plate; the diaphragm is installed between the voice coil motor connecting plate and the differential pressure control valve connecting plate; the two sides of the diaphragm are in contact with the end face of the voice coil motor connecting shaft and the middle shaft section, respectively.

8. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 6, characterized in that, The diameter of the axial through hole in the diaphragm is slightly smaller than that of the central shaft section and the voice coil motor connecting shaft.

9. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 2, characterized in that, A fifth sealing ring is installed between the differential pressure control valve body and the differential pressure control valve body connecting plate; a sixth sealing ring is installed between the connecting flange and the differential pressure control valve body; a differential pressure control valve body sealing ring groove for installing the fifth sealing ring is also provided on the end face of the differential pressure control valve body near the voice coil motor; a connecting flange annular sealing ring groove for installing the sixth sealing ring is provided on the end face of the connecting flange near the voice coil motor.

10. The voice coil motor direct-drive diaphragm static seal conical throttling differential pressure control valve according to claim 1, characterized in that, The middle shaft section passes sequentially through the axial through hole of the first valve sleeve fixing ring and the valve body connecting plate of the differential pressure control valve; the shaft section near the voice coil motor passes sequentially through the axial through hole of the first valve sleeve fixing ring, the valve body connecting plate of the differential pressure control valve, the diaphragm and the voice coil motor connecting plate and is connected to the voice coil motor connecting shaft.

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