A low-pressure relief valve directly driven by an underwater voice coil motor

Abstract

The present invention provides a low-pressure relief valve directly driven by an underwater voice coil motor, comprising a valve body, a main valve, and a solenoid valve; the valve body is provided with a liquid inlet and a liquid outlet; the main valve comprises a valve sleeve and a valve core; the front end of the valve sleeve is provided with a main valve liquid inlet, and the front end of the valve core is capable of closing the main valve liquid inlet; the valve sleeve is also provided with a main valve liquid outlet; the solenoid valve comprises a voice coil motor, an oil tank, a diaphragm motor mounting plate, a diaphragm valve body mounting plate, a diaphragm, and a force transmission mechanism; the diaphragm is mounted between the diaphragm valve body mounting plate and the diaphragm motor mounting plate; one end of the force transmission mechanism contacts the valve core, and the other end is connected to the voice coil motor; the diaphragm is used to block the liquid in the valve sleeve from the insulating oil in the oil tank. The technical solution of the present invention solves the problems inherent in deep-sea pressure-regulating relief valves when controlling system pressure, such as sealing and pressure balance, and the problem that electromechanical converters are difficult to use normally underwater.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater hydraulic equipment, and in particular to a low-pressure relief valve directly driven by an underwater voice coil motor. Background Art

[0002] A relief valve is a typical pressure control valve in the hydraulic transmission field. Its primary function within a hydraulic system is to control inlet pressure. Currently, pressure-regulating relief valves are typically used onshore, in conjunction with a pump or external hydraulic system, and control very high pressure levels. Pressure regulation is typically performed in parallel with a safety valve whose opening pressure exceeds the pressure regulation range of the low-pressure relief valve. Pressure regulation is achieved by controlling the pre-compression of the spring. Patent CN201910164757.7 discloses a relief valve that can both regulate and limit pressure. This valve's pressure regulation still relies on the traditional manual control of spring pre-compression to adjust the pressure at the valve inlet. Patent 202321198204.1 discloses a pressure-regulating valve and solenoid valve that uses an electromagnet instead of a spring and metal guide rod to regulate pressure. This valve can address issues such as abnormal noise, premature air release, and inaccurate pressure regulation. Its structure is simple, representing a simple superposition of a solenoid valve and a pressure-regulating valve. Summary of the Invention

[0003] Based on the above-mentioned problems existing in the deep-sea pressure-regulating relief valve system pressure, such as sealing and pressure balance, and the problem that the electromechanical converter is difficult to use normally underwater, the present invention proposes a low-pressure relief valve that can be used underwater and directly controls the system pressure through a voice coil motor. It can adjust the internal pressure of a deep-sea working cavity (such as a high-elasticity rubber water bag, a water pressure artificial muscle, a hydraulic cylinder, etc.).

[0004] The technical means adopted in the present invention are as follows:

[0005] A low-pressure relief valve directly driven by an underwater voice coil motor, comprising a valve body, a main valve installed inside the valve body, and a solenoid valve installed on the outer side of the valve body;

[0006] A main valve installation cavity for installing the main valve is provided inside the valve body, one end of the main valve installation cavity is open, and the opening faces the solenoid valve; the valve body is provided with a liquid inlet and a liquid outlet;

[0007] The main valve includes a valve sleeve and a valve core; the valve sleeve is axially provided with a valve core installation cavity, and the valve core is installed in the valve core installation cavity; the opening of the valve core installation cavity faces the opening of the main valve installation cavity; the front end of the valve sleeve is provided with a main valve liquid inlet, and the front end of the valve core can close the main valve liquid inlet; the valve sleeve is also provided with a main valve liquid outlet, and the main valve liquid inlet and the main valve liquid outlet are respectively connected to the liquid inlet and the liquid outlet; the main valve liquid inlet and the main valve liquid outlet are both connected to the valve core installation cavity;

[0008] The solenoid valve includes a voice coil motor, an oil tank, a diaphragm motor mounting plate, a diaphragm valve body mounting plate, a diaphragm, and a force transmission mechanism. The voice coil motor is located inside the oil tank, which is filled with insulating oil. The diaphragm valve body mounting plate, the diaphragm motor mounting plate, and the oil tank are sequentially arranged on the side of the valve body, and the diaphragm is mounted between the diaphragm valve body mounting plate and the diaphragm motor mounting plate. One end of the force transmission mechanism contacts the valve core, and the other end passes through the opening of the valve core mounting cavity, the diaphragm valve body mounting plate, the diaphragm, and the diaphragm motor mounting plate in sequence to be connected to the voice coil motor. The diaphragm is used to block the liquid in the valve sleeve from the insulating oil in the oil tank.

[0009] The oil tank, the voice coil motor, the diaphragm motor mounting plate, the diaphragm valve body mounting plate, the diaphragm and the force transmission mechanism are all coaxially arranged with the main valve.

[0010] Furthermore, the valve sleeve is composed of a front main valve sleeve and a rear main valve sleeve, and the valve core installation cavity is composed of the central through holes of the front main valve sleeve and the rear main valve sleeve; the main valve liquid inlet is arranged at the front end of the front main valve sleeve, and the main valve liquid outlet is arranged on the side of the front main valve sleeve, and the main valve liquid inlet and the main valve liquid outlet are both connected to the central through hole of the front main valve sleeve; the valve core is installed in the central through hole of the front main valve sleeve;

[0011] The valve body is also provided with a process hole I and a process hole II; the process hole II connects the liquid outlet with the process hole I, and its opening faces the solenoid valve; a sealing ring II is installed at the opening of the process hole II; a connecting hole is provided on the side of the rear main valve sleeve, one end of the process hole I is connected to the connecting hole, and the other end is sealed; the central through hole of the front main valve sleeve and the rear main valve sleeve is connected through the main valve liquid outlet, the liquid outlet, the process hole II, the process hole I and the connecting hole.

[0012] Furthermore, one end of the rear main valve sleeve is provided with a groove, and one end of the front main valve sleeve extends into the groove to realize axial positioning of the front main valve sleeve and the rear main valve sleeve, so that the front main valve sleeve and the rear main valve sleeve are combined into the valve sleeve;

[0013] The front end of the valve core is a conical surface, and the inner wall of the front end of the central through hole of the front main valve sleeve is provided with a conical surface. When the low-pressure relief valve is working, the conical surface of the valve core can press against the conical surface of the front end of the central through hole of the front main valve sleeve to form a line contact seal, thereby closing the main valve liquid inlet.

[0014] Furthermore, the force transmission mechanism includes a valve body force transmission rod, a motor force transmission rod and a motor force transmission rod mounting plate;

[0015] One end of the valve body force transmission rod is spherical and contacts the valve core, and the other end is fixedly connected to the motor force transmission rod mounting plate, and the diaphragm is clamped and fixed between the valve body force transmission rod and the motor force transmission rod mounting plate;

[0016] Both ends of the motor force transmission rod are respectively provided with external threads, one end is connected to the threaded hole in the center of the motor force transmission rod mounting plate, and the other end is threadedly connected to the voice coil motor mover of the voice coil motor; the center of the voice coil motor mover is provided with a threaded hole for cooperating with the installation of the motor force transmission rod.

[0017] Furthermore, the motor force transmission rod is rotatably mounted on the central through hole of the diaphragm motor mounting plate through a linear bearing; the linear bearing fixing flange is fixedly mounted on one side of the central through hole of the diaphragm motor mounting plate, and is used to axially limit the linear bearing;

[0018] The linear bearing fixing flange, the linear bearing, the valve body force transmission rod, the motor force transmission rod and the motor force transmission rod mounting plate are all coaxially arranged with the main valve.

[0019] Furthermore, a sealing ring I is installed between one end of the valve sleeve and the valve core installation cavity;

[0020] A sealing ring III is installed between the diaphragm valve body mounting plate and the valve body;

[0021] A sealing ring IV and a sealing ring V are respectively installed between the diaphragm motor mounting plate, the diaphragm valve body mounting plate and the oil tank.

[0022] Furthermore, one side of the diaphragm motor mounting plate is a motor mounting surface, and the other side is a first diaphragm mounting surface. A central through hole is provided in the center, which passes through the motor mounting surface and the first diaphragm mounting surface, for allowing the force transmission mechanism to pass through.

[0023] The motor mounting surface is provided with a first circular groove for mounting the voice coil motor, and a countersunk through hole is provided in the first circular groove for matching with a threaded hole on the voice coil motor stator of the voice coil motor, and the voice coil motor stator is mounted in the first circular groove by installing screws;

[0024] A second circular groove is provided on the first diaphragm mounting surface, and a third circular groove is further provided on the bottom surface of the second circular groove;

[0025] The motor mounting surface and the first diaphragm mounting surface are respectively provided with an annular groove for mounting a sealing ring;

[0026] One side of the diaphragm valve body mounting plate is a second diaphragm mounting surface, and a central through hole is provided in the center for the force transmission mechanism to pass through; the second diaphragm mounting surface is provided with a first annular boss that can be embedded in the second circular groove, and the first annular boss and the second circular groove cooperate with each other to enable the diaphragm valve body mounting plate to be mounted to the diaphragm motor mounting plate;

[0027] A second annular boss that can be embedded in the third circular groove is provided on the side surface of the diaphragm facing the diaphragm motor mounting plate. The second annular boss cooperates with the third circular groove to clamp the diaphragm between the diaphragm motor mounting plate and the diaphragm valve body mounting plate.

[0028] Furthermore, a flange is provided at one end of the oil tank facing the diaphragm motor mounting plate, and four through holes are provided on the flange at equal intervals along the circumference; a compensator connection port and a watertight connector mounting port are provided at one end of the oil tank;

[0029] The diaphragm valve body mounting plate and the diaphragm motor mounting plate are respectively provided with four through holes at equal intervals along the circumferential direction;

[0030] The end surface of the valve body facing the diaphragm valve body mounting plate is provided with four threaded holes at equal intervals along the circumferential direction;

[0031] The valve body, the diaphragm valve body mounting plate, the diaphragm motor mounting plate and the oil tank are connected by passing four screws through the four through holes on the oil tank, the diaphragm valve body mounting plate and the diaphragm motor mounting plate in sequence and installing them to the four threaded holes on the valve body.

[0032] Furthermore, a through hole for the motor force transmission rod to pass through is provided at the center of the linear bearing fixing flange, and eight through holes are provided at equal intervals along the circumference;

[0033] A groove is provided on the first diaphragm mounting surface, and the groove can form a cavity with the diaphragm; four threaded holes and four through holes are arranged at equal intervals along the circumference in the groove, the threaded holes and the through holes are arranged alternately, and the four threaded holes and the four through holes correspond one to one with the eight through holes on the linear bearing fixing flange; the four through holes on the linear bearing fixing flange are connected to the four threaded holes on the first diaphragm mounting surface by screws, so that the linear bearing fixing flange is installed on the diaphragm motor mounting plate; the other four through holes on the linear bearing fixing flange are respectively connected to the four through holes on the first diaphragm mounting surface, for ensuring that the cavity is not airtight, so that the insulating oil in the cavity can be sucked in or discharged.

[0034] Furthermore, the diaphragm is made of highly elastic material; the valve body, the valve core, the front main valve sleeve, the rear main valve sleeve, the oil tank, the diaphragm motor mounting plate, the diaphragm valve body mounting plate, the linear bearing fixing flange, the linear bearing, the valve body force transmission rod, the motor force transmission rod and the motor force transmission rod mounting plate are all made of corrosion-resistant, high-strength stainless steel materials.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] The low-pressure relief valve directly driven by an underwater voice coil motor provided by the present invention uses 316L stainless steel as the material, is resistant to seawater corrosion, and can operate in deep sea; it has a simple structure, and all parts are arranged coaxially with the main valve in the valve body during installation, which is convenient for installation and disassembly; the overall volume is small, and the square change design can be integrated into the valve group in the later stage without affecting other components; the motor driving force replaces the role of the traditional spring in the pressure control valve, and the motor driving force can be remotely controlled to replace the manual change of the spring preload. It realizes pressure regulation of the control load system; it has good sealing performance. The motor drive part of the valve is immersed in insulating oil such as silicone oil, and the dynamic seal of the power transmission mechanism during movement is converted into a static seal through the diaphragm, which isolates the water in the overflow valve body from entering the solenoid valve and damaging the motor. In addition, oil sealing grooves are arranged at other positions of the solenoid valve for installing sealing rings to prevent external water from entering the solenoid valve; the pressure regulation accuracy is high. When the valve is working underwater, the oil tank of the solenoid valve part is connected to a compensator to ensure the pressure balance of the cavities on both sides of the diaphragm, reducing the burden of force balancing on the valve core when the voice coil motor is working, expanding the pressure regulation range, and improving the pressure regulation accuracy.

[0037] Based on the above reasons, the present invention can be widely promoted in the field of underwater deep-sea hydraulic equipment pressure control. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 It is a structural schematic diagram of a low-pressure relief valve directly driven by an underwater voice coil motor according to the present invention.

[0040] Figure 2 It is a front structural schematic diagram of the low-pressure relief valve directly driven by the underwater voice coil motor of the present invention.

[0041] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0042] Figure 4 Schematic diagram of the valve body structure.

[0043] Figure 5 It is a schematic diagram of the cross-sectional structure of the valve body and the main valve.

[0044] Figure 6 It is a schematic diagram of the cross-sectional structure of the solenoid valve.

[0045] Figure 7 Schematic diagram of the valve core under stress.

[0046] Figure 8 2 is a schematic structural diagram of the diaphragm motor mounting plate.

[0047] Figure 9 2 is a schematic structural diagram of the diaphragm valve body mounting plate.

[0048] Figure 10 It is a structural schematic diagram of the first diaphragm mounting surface of the diaphragm motor mounting plate.

[0049] In the figure: 1. Valve body; 2. Main valve; 3. Solenoid valve; 4. Diaphragm valve body mounting plate; 41. Second diaphragm mounting surface; 5. Diaphragm motor mounting plate; 51. Motor mounting surface; 52. First diaphragm mounting surface; 6. Diaphragm; 7. Front main valve sleeve; 8. Rear main valve sleeve; 9. Valve core; 10. Valve body force rod; 11. Motor force rod mounting plate; 12. Linear bearing fixing flange; 13. Motor force rod; 14. Linear bearing; 15. Voice coil motor stator; 16. Voice coil motor mover; 17. Oil tank; 100. Liquid inlet; 101. Outlet Liquid port; 102, sealing ring I; 103, process hole I; 104, sealing ring II; 105, process hole II; 106, compensator connection port; 107, watertight connector installation port; 108, sealing ring III; 109, sealing ring IV; 110, sealing ring V; 111, threaded hole I; 112, threaded hole II; 113, threaded hole III; 114, threaded hole IV; 115, through hole I; 116, through hole II; 117, through hole III; 118, through hole IV; 119, countersunk through hole I; 120, countersunk through hole II. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0054] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0057] Example 1

[0058] like Figure 1-10 As shown, the present invention provides a low-pressure relief valve directly driven by an underwater voice coil motor, comprising a valve body 1, a main valve 2 installed inside the valve body 1, and a solenoid valve 3 installed on the outer side of the valve body 1;

[0059] The valve body 1 is provided with a main valve installation cavity for installing the main valve 2, one end of the main valve installation cavity is open, and the opening faces the solenoid valve 3; the valve body 1 is provided with a liquid inlet 100 and a liquid outlet 101, both of which are opened on the surface of the valve body 1;

[0060] The main valve 2 includes a valve sleeve and a valve core 9; the valve sleeve is axially provided with a valve core installation cavity, and the valve core 9 is installed in the valve core installation cavity; the opening of the valve core installation cavity faces the opening of the main valve installation cavity; the front end of the valve sleeve is provided with a main valve liquid inlet, and the front end of the valve core 9 can close the main valve liquid inlet. When the low-pressure relief valve is working, the main valve liquid inlet serves as a valve port, and the opening and closing of the valve port and the degree of opening can be controlled by the axial movement of the valve core 9; the valve sleeve is also provided with a main valve liquid outlet, and the main valve liquid inlet and the main valve liquid outlet are respectively connected to the liquid inlet 100 and the liquid outlet 101; the main valve liquid inlet and the main valve liquid outlet are both connected to the valve core installation cavity;

[0061] The solenoid valve 3 includes a voice coil motor, an oil tank 17, a diaphragm motor mounting plate 5, a diaphragm valve body mounting plate 4, a diaphragm 6, and a force transmission mechanism. The voice coil motor is located inside the oil tank 17 and is isolated from the external seawater. The oil tank 17 is filled with insulating oil to protect the coil and magnet of the voice coil motor inside so that they can operate normally in the deep sea. The diaphragm valve body mounting plate 4, the diaphragm motor mounting plate 5, and the oil tank 17 are sequentially arranged on the side of the valve body 1, and the diaphragm 6 is installed between the diaphragm valve body mounting plate 4 and the diaphragm motor mounting plate 5. One end of the force transmission mechanism contacts the valve core 9, and the other end passes through the opening of the valve core mounting cavity, the diaphragm valve body mounting plate 4, the diaphragm 6, and the diaphragm motor mounting plate 5 in sequence to connect to the voice coil motor. The diaphragm 6 is used to block the liquid in the valve sleeve from the insulating oil in the oil tank 17.

[0062] The oil tank 17 , the voice coil motor, the diaphragm motor mounting plate 5 , the diaphragm valve body mounting plate 4 , the diaphragm 6 and the force transmission mechanism are all coaxially arranged with the main valve 2 .

[0063] Furthermore, the main valve installation cavity is a cylindrical cavity.

[0064] Furthermore, the valve sleeve is composed of a front main valve sleeve 7 and a rear main valve sleeve 8, and the valve core installation cavity is composed of the central through holes of the front main valve sleeve 7 and the rear main valve sleeve 8; the main valve liquid inlet is arranged at the front end of the front main valve sleeve 7, and the main valve liquid outlet is arranged on the side of the front main valve sleeve 7, and the main valve liquid inlet and the main valve liquid outlet are both connected to the central through hole of the front main valve sleeve 7; the valve core 9 is installed in the central through hole of the front main valve sleeve 7;

[0065] The valve body 1 is also provided with a process hole I103 and a process hole II105; the process hole II105 connects the liquid outlet 101 with the process hole I103, and its opening faces the solenoid valve 3; a connecting hole is provided on the side of the rear main valve sleeve 8, one end of the process hole I103 is connected to the connecting hole, and the other end is sealed by hammering in a steel ball or by fitting a screw plug through a threaded hole; the central through hole of the front main valve sleeve 7 and the rear main valve sleeve 8 are connected through the main valve liquid outlet, the liquid outlet 101, the process hole II105, the process hole I103 and the connecting hole, so that when the low-pressure relief valve is working, the pressure in the central through hole of the rear main valve sleeve 8 can be the same as the pressure of the central through hole of the front main valve sleeve 7, that is, the liquid outlet 101.

[0066] Furthermore, a groove is provided at one end of the rear main valve sleeve 8, and one end of the front main valve sleeve 7 extends into the groove to realize axial positioning of the front main valve sleeve 7 and the rear main valve sleeve 8, so that the front main valve sleeve 7 and the rear main valve sleeve 8 are combined into the valve sleeve.

[0067] Furthermore, the front end of the valve core 9 is a conical surface, and the inner wall of the front end of the central through hole of the front main valve sleeve 7 is provided with a conical surface. When the low-pressure relief valve is working, the conical surface of the valve core 9 can press against the conical surface of the front end of the central through hole of the front main valve sleeve 7 to form a line contact seal, thereby closing the main valve liquid inlet.

[0068] Furthermore, a compensator connection port 106 and a watertight connector installation port 107 are provided at one end of the oil tank 17; when the low-pressure relief valve is working underwater, the compensator connection port 106 is used to connect to an external compensator, and the compensator can balance the internal pressure of the oil tank 17 with the external pressure; the watertight connector installation port 107 is used to install a watertight connector, and the watertight connector can connect the connecting line of the voice coil motor with the external electromechanical converter to realize the input of external signals.

[0069] Furthermore, the voice coil motor is composed of a voice coil motor stator 15 and a voice coil motor mover 16; the voice coil motor stator 15 is cylindrical and inserted into the voice coil motor mover 16. The voice coil motor stator 15 is a permanent magnet, and the voice coil motor mover 16 is a coil wound on the surface of a non-magnetic cylinder. When a voltage signal is applied to the voice coil motor stator 15, the voice coil motor mover 16 will be subjected to the action of the magnetic force to move axially; a threaded hole is provided on the mounting surface of the voice coil motor stator 15.

[0070] Furthermore, the force transmission mechanism includes a valve body force transmission rod 10, a motor force transmission rod 13 and a motor force transmission rod mounting plate 11;

[0071] One end of the valve body force transmission rod 10 is spherical and contacts the valve core 9, and the other end is fixedly connected to the motor force transmission rod mounting plate 11. The diaphragm 6 is clamped and fixed between the valve body force transmission rod 10 and the motor force transmission rod mounting plate 11.

[0072] The motor force transmission rod 13 is provided with external threads at both ends, one end is connected to the threaded hole in the center of the motor force transmission rod mounting plate 11, and the other end is threadedly connected to the voice coil motor mover 16 of the voice coil motor; the center of the voice coil motor mover 16 is provided with a threaded hole for cooperating with the installation of the motor force transmission rod 13.

[0073] Furthermore, the diaphragm 6 has a circular shape, and the diaphragm 6 is provided with four through holes at equal intervals along the circumferential direction; the end face of the motor force rod mounting plate 11 facing the valve body force rod 10 is provided with four countersunk through holes at equal intervals along the circumferential direction; one end of the valve body force rod 10 is spherical, and the end face of the other end is provided with four threaded holes at equal intervals along the circumferential direction; four bolts can pass through the four countersunk through holes on the motor force rod mounting plate 11 and the four through holes on the diaphragm 6 and be installed to the four threaded holes on the valve body force rod 10, so that the diaphragm 6 is clamped and fixed between the valve body force rod 10 and the motor force rod mounting plate 11.

[0074] Furthermore, the voice coil motor stator 15 is provided with a central through hole in the axial direction, and the motor force transmission rod 13 passes through the central through hole of the voice coil motor stator 15 and is connected to the voice coil motor mover 16. The diameter of the central through hole of the voice coil motor stator 15 is larger than the diameter of the threaded hole in the center of the voice coil motor mover 16.

[0075] Furthermore, the motor force transmission rod 13 is rotatably mounted on the central through hole of the diaphragm motor mounting plate 5 through a linear bearing 14; the linear bearing fixing flange 12 is fixedly mounted on one side of the central through hole of the diaphragm motor mounting plate 5, and is used to axially limit the linear bearing 14.

[0076] Furthermore, the linear bearing fixing flange 12 , the linear bearing 14 , the valve body force transmission rod 10 , the motor force transmission rod 13 and the motor force transmission rod mounting plate 11 are all coaxially arranged with the main valve 2 .

[0077] Furthermore, a sealing ring I 102 is installed between one end of the valve sleeve and the valve core installation cavity;

[0078] A sealing ring III 108 is installed between the diaphragm valve body mounting plate 4 and the valve body 1;

[0079] A sealing ring IV 109 and a sealing ring V 110 are respectively installed between the diaphragm motor mounting plate 5 , the diaphragm valve body mounting plate 4 and the oil tank 17 .

[0080] Furthermore, a sealing ring II 104 is installed at the opening of the process hole II 105 to ensure the seal between the process hole II 105 and the solenoid valve 3 , ensuring that when the low-pressure relief valve is working, water is only discharged through the liquid outlet 101 .

[0081] Furthermore, one side of the diaphragm motor mounting plate 5 is a motor mounting surface 51, and the other side is a first diaphragm mounting surface 52. A central through hole is provided in the center, which passes through the motor mounting surface 51 and the first diaphragm mounting surface 52, for allowing the force transmission mechanism to pass through.

[0082] The motor mounting surface 51 is provided with a first circular groove for mounting the voice coil motor. Two countersunk through holes (countersunk through hole I 119 and countersunk through hole II 120) are provided in the first circular groove for matching with two threaded holes on the voice coil motor stator 15 of the voice coil motor. The voice coil motor stator 15 is mounted in the first circular groove by installing screws.

[0083] A second circular groove is provided on the first diaphragm mounting surface 52, and a third circular groove is further provided on the bottom surface of the second circular groove;

[0084] The motor mounting surface 51 and the first diaphragm mounting surface 52 are respectively provided with annular grooves for mounting the sealing ring V110 and the sealing ring IV109;

[0085] One side of the diaphragm valve body mounting plate 4 is a second diaphragm mounting surface 41, with a central through hole for the force transmission mechanism to pass through. The second diaphragm mounting surface 41 is provided with a first annular boss that can be embedded in the second circular groove. The first annular boss and the second circular groove cooperate with each other to enable the diaphragm valve body mounting plate 4 to be mounted to the diaphragm motor mounting plate 5.

[0086] The diaphragm 6 is provided with a second annular boss that can be embedded in the third circular groove on the side surface facing the diaphragm motor mounting plate 5. The second annular boss cooperates with the third circular groove to better clamp the diaphragm 6 between the diaphragm motor mounting plate 5 and the diaphragm valve body mounting plate 4.

[0087] Furthermore, a flange is provided on one end of the oil tank 17 facing the diaphragm motor mounting plate 5, and four through holes are provided on the flange at equal intervals along the circumferential direction;

[0088] The diaphragm valve body mounting plate 4 and the diaphragm motor mounting plate 5 are respectively provided with four through holes at equal intervals along the circumferential direction;

[0089] The end surface of the valve body 1 facing the diaphragm valve body mounting plate 4 is provided with four threaded holes at equal intervals along the circumferential direction;

[0090] The valve body 1, the diaphragm valve body mounting plate 4, the diaphragm motor mounting plate 5 and the oil tank 17 are connected by passing four screws through the four through holes on the oil tank 17, the diaphragm valve body mounting plate 4 and the diaphragm motor mounting plate 5 in sequence and installing them to the four threaded holes on the valve body 1.

[0091] Furthermore, a through hole is provided at the center of the linear bearing fixing flange 12 for the motor force transmission rod 13 to pass through, and eight through holes are provided at equal intervals along the circumference;

[0092] A groove is provided on the first diaphragm mounting surface 52, and the groove can form a cavity with the diaphragm 6; four threaded holes (threaded hole I 111, threaded hole II 112, threaded hole III 113, threaded hole IV 114) and four through holes (through hole I 115, through hole II 116, through hole III 117, through hole IV 118) are arranged at equal intervals along the circumferential direction in the groove, and the threaded holes and the through holes are arranged alternately, and the four threaded holes and the four through holes correspond to the eight through holes on the linear bearing fixing flange 12 respectively; the four through holes on the linear bearing fixing flange 12 are connected by threaded holes. The linear bearing fixing flange 12 is connected to the four threaded holes (threaded hole I 111, threaded hole II 112, threaded hole III 113, threaded hole IV 114) on the first diaphragm mounting surface 52 through wires, so that the linear bearing fixing flange 12 is installed on the diaphragm motor mounting plate 5; the other four through holes on the linear bearing fixing flange 12 are respectively connected to the four through holes (through hole I 115, through hole II 116, through hole III 117, through hole IV 118) on the first diaphragm mounting surface 52, so as to ensure that the cavity is not airtight, so that the insulating oil in the cavity can be sucked in or discharged;

[0093] When the low-pressure relief valve is working, the diaphragm 6 will be deformed under the influence of the axial movement of the motor force transmission rod 13, thereby causing the volume of the cavity to change. Since the oil has a low compressibility and is difficult to be compressed or expanded, the provision of interconnected through holes on the first diaphragm mounting surface 52 and the linear bearing fixing flange 12 can ensure that the cavity is not airtight, which is conducive to the smooth flow of insulating oil into or out of the cavity. Specifically, the insulating oil in the oil tank 17 can flow into or out of the cavity through the opening on the voice coil motor mover 16 of the voice coil motor, the gap between the motor force transmission rod 13 and the voice coil motor stator 15 of the voice coil motor, the four through holes (through hole I 115, through hole II 116, through hole III 117, through hole IV 118) on the first diaphragm mounting surface 52, and the through holes on the linear bearing fixing flange 12.

[0094] Furthermore, a groove capable of forming a cavity with the diaphragm 6 is also provided on the second diaphragm mounting surface 41 .

[0095] Furthermore, the diaphragm 6 is made of a highly elastic material such as hydrogenated nitrile rubber; the valve body 1, the valve core 9, the front main valve sleeve 7, the rear main valve sleeve 8, the oil tank 17, the diaphragm motor mounting plate 5, the diaphragm valve body mounting plate 4, the linear bearing fixing flange 12, the linear bearing 14, the valve body force transmission rod 10, the motor force transmission rod 13 and the motor force transmission rod mounting plate 11 are all made of corrosion-resistant, high-strength stainless steel materials such as 316L stainless steel.

[0096] The underwater voice coil motor directly driven low-pressure relief valve of the present invention uses a voice coil motor and a force transmission mechanism to replace the compression spring in the traditional relief valve. The principle is as follows: when working, the power supply supplies current to the voice coil motor so that the voice coil motor generates a leftward ampere force acting on the voice coil motor mover 16. The force is linearly proportional to the voltage applied to the voice coil motor. The voice coil motor mover transmits the force to the motor force transmission rod 13, and the motor force transmission rod 13 then transmits the force to the valve body force transmission rod 10. The two The two are connected via the motor force rod mounting plate 11; the valve body force rod 10 then transmits the force to the pressure regulating valve core 9, and the two are in point contact through the spherical surface at the end of the valve body force rod 10; finally, the pressure regulating valve core 9 is pushed to the left and presses against the left high-pressure water inlet (main valve liquid inlet), wherein the motor force rod 13 is positioned and guided by the linear bearing 14, ensuring that the voice coil motor mover 16 has good centering when transmitting force to the valve core 9, reducing the friction force when the motor force rod 13 moves;

[0097] When the low-pressure relief valve of the present invention operates underwater, the solenoid valve portion, including the voice coil motor, is completely immersed in insulating oil and enclosed and sealed by an oil tank 17. The valve and the electromechanical converter used with it are both made of pressure-resistant and corrosion-resistant materials, ensuring a long service life. The electromechanical converter utilizes an oil-immersed, pressure-resistant voice coil motor that can be immersed in insulating oils such as silicone oil. The portion of the solenoid valve 3 that contacts the main valve 2 is isolated from the insulating oil within the solenoid valve 3 by a diaphragm 6.

[0098] The diaphragm 6 plays a sealing role in the low-pressure relief valve described in the present invention. The diaphragm 6 converts the dynamic seal of the valve force transmission mechanism during axial movement into a static seal to prevent water in the valve body 1 from seeping into the insulating oil environment where the motor is located. The diaphragm 6 has a shape similar to a small disc. The diaphragm 6 is installed between the valve body force transmission rod 10 and the motor force transmission rod 13. The motor force transmission rod mounting plate 11, the diaphragm 6 and the valve body force transmission rod 10 are connected by screws. The three form a flange-like mounting structure through the motor force transmission rod mounting plate 11. In addition, an annular boss is provided on the edge of the diaphragm 6, which is axially fixed between the diaphragm motor mounting plate 5 and the diaphragm valve body mounting plate 4 by cooperating with the circular groove on the diaphragm motor mounting plate 5.

[0099] The motor force transmission rod 13 is connected to the motor force transmission rod mounting plate 11 by threaded engagement;

[0100] Since the diaphragm 6 is made of a highly elastic material, it has a restoring force Fm, and it tends to return to its original shape after elastic deformation. This restoring force Fm is related to the amount of elastic deformation. This force will affect the accuracy of the voice coil motor during voltage regulation. Therefore, on the basis of ensuring sealing, the smaller the force, the better.

[0101] The motor part of the solenoid valve part of the low-pressure relief valve is all in the oil tank 17, and the oil tank 17 is filled with insulating oil. The end cover part of the oil tank 17 is provided with a watertight connector installation port 107 and a compensator connection port 106; wherein, the watertight connector installation port 107 is used to install a watertight connector to connect the positive and negative pole connection lines of the motor with the external electromechanical converter to realize external signal input; the compensator connection port 106 is connected to the external compensator, which can make the external pressure and the pressure inside the oil tank 17 close to balance when the low-pressure relief valve is working underwater, and at the same time, the pressure of the two sides of the cavity sealed and isolated by the diaphragm 6 (the liquid outlet on one side of the main valve 2) is close to the balance of the pressure of the oil tank 17. 101 pressure and the insulating oil pressure on one side of the solenoid valve 3) tend to be balanced and offset each other, so that when the voice coil motor is working, it is only balanced by the liquid pressure at the valve port, the restoring force of the diaphragm 6, and the hydraulic clamping resistance (the friction force that prevents the valve core 9 from opening, specifically referring to the resistance formed by the valve core being stuck in the chamber where it moves due to uneven force when the valve core moves). The restoring force of the diaphragm 6 and the hydraulic clamping resistance are very small, which can be regarded as the force provided by the voice coil motor being able to directly balance the liquid pressure at the valve port, which can improve the control accuracy of the low-pressure relief valve when it is working. When the low-pressure relief valve is working underwater, the response speed can also be improved when a signal is given to the voice coil motor from a long distance for control.

[0102] The low-pressure relief valve directly driven by the underwater voice coil motor of the present invention has three functions during operation: a pressure limiting function, a pressure regulating function, and an emergency pressure relief function:

[0103] The working principle under the voltage limiting function is as follows: Figure 7 As shown, the pressure at the inlet of the relief valve increases, and the pressure at the main valve inlet increases from 0 to the stage where the valve core 9 is opened. The high-pressure water at the inlet 100 enters the main valve inlet through the flow channel, forming a pressure P on the left side of the valve core 9. The pressure P0 on the right side of the valve core 9 is equal to the outside. The pressure difference P1 between P and P0 on the left side of the valve core 9 and the flow area A of the valve port form a rightward thrust F1 tending to open the valve core 9 of the relief valve; the right side of the valve core 9 has a leftward thrust caused by the actuator of the voice coil motor. F2, the friction force Ff that prevents the valve core 9 from opening, and the restoring force Fm of the diaphragm 6 that prevents the valve core 9 from opening; as the pressure at the valve body's liquid inlet continues to increase to the opening pressure of the valve core 9, that is, when the valve core 9 is subjected to a rightward thrust F1>F2+Ff+Fm, the valve core 9 opens, and the degree of opening depends on the difference between F1 and F2+Ff+Fm. The high-pressure water at the main valve's liquid inlet flows to the main valve's liquid outlet, the overflow valve begins to overflow, and then the excess liquid is discharged through the liquid outlet 101.

[0104] The working principle under the pressure regulation function is as follows: when the low-pressure relief valve directly driven by the underwater voice coil motor is connected in parallel with the safety valve, the low-pressure relief valve plays a pressure regulation function in the hydraulic circuit; when the pressure at the main valve inlet of the low-pressure relief valve changes from 0 to the stage where the valve core 9 opens, the force balance of the valve core 9 is the same as the force balance under the pressure limiting function; when the valve core 9 is opened, by changing the voltage of the voice coil motor, the axial ampere force F2 applied to the voice coil motor mover 16 to the left by the voice coil motor is changed. Since the degree of opening of the valve core 9 at this time depends on the difference between F1 and F2+Ff+Fm, changing the size of F2 can change the degree of opening of the valve core 9, that is, the size of F1. Small, F1 is the force formed by the product of the pressure difference P1 at the inlet and outlet of the relief valve and the flow area. The pressure P0 at the valve body outlet is constant, that is, the pressure P at the valve body inlet is changed, that is, the pressure of the variable volume cavity. Since the magnitude of this force is linearly corresponding to the voltage of the voice coil motor, it can replace the traditional relief valve to manually change the spring pre-compression to adjust the pressure. In addition, since the force provided by the voice coil motor changes with the signal, a valve port pressure sensor can also be added to the hydraulic system to monitor the pressure of the valve body inlet and valve body outlet, and the pressure signal is transmitted to the computer. The closed-loop control system pressure can be realized by combining the control signal such as PID with the pressure signal to give the voice coil motor signal.

[0105] The working principle of the emergency pressure relief function is as follows: when the system inlet pressure is too high and exceeds the pressure relief range of the relief valve or an emergency occurs, a reverse current signal can be given to the voice coil motor. At this time, the voice coil motor mover 16 will drive the motor force transmission rod 13, the motor force transmission rod mounting plate 11, and the valve body force transmission rod 10 to move to the right. At this time, after the relief valve spool 9 loses the force that presses against the valve body liquid inlet, the relief valve spool 9 is subjected to the force formed by the pressure at the valve body liquid inlet and the flow area. The valve body liquid inlet opens, and the high-pressure water at the liquid inlet 100 flows rapidly to the valve body liquid outlet through the valve body liquid inlet, and then realizes emergency pressure relief through the liquid outlet 101, preventing the relief valve system pressure from continuously increasing, achieving the function of emergency protection of the system, and thus better protecting the safety and stability of the variable volume cavity and the relief valve.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 low-pressure relief valve directly driven by an underwater voice coil motor, characterized in that: It comprises a valve body (1), a main valve (2) installed inside the valve body (1), and a solenoid valve (3) installed on the outer side of the valve body (1); A main valve installation cavity for installing the main valve (2) is provided inside the valve body (1), one end of the main valve installation cavity is open, and the opening faces the solenoid valve (3); the valve body (1) is provided with a liquid inlet (100) and a liquid outlet (101); The main valve (2) includes a valve sleeve and a valve core (9); the valve sleeve is provided with a valve core installation cavity along the axial direction, and the valve core (9) is installed in the valve core installation cavity; the opening of the valve core installation cavity faces the opening of the main valve installation cavity; the front end of the valve sleeve is provided with a main valve liquid inlet, and the front end of the valve core (9) can close the main valve liquid inlet; the valve sleeve is also provided with a main valve liquid outlet, and the main valve liquid inlet and the main valve liquid outlet are respectively connected to the liquid inlet (100) and the liquid outlet (101); the main valve liquid inlet and the main valve liquid outlet are both connected to the valve core installation cavity; The solenoid valve (3) includes a voice coil motor, an oil tank (17), a diaphragm motor mounting plate (5), a diaphragm valve body mounting plate (4), a diaphragm (6) and a force transmission mechanism; the voice coil motor is located inside the oil tank (17), and the oil tank (17) is filled with insulating oil; the diaphragm valve body mounting plate (4), the diaphragm motor mounting plate (5) and the oil tank (17) are sequentially arranged on the side of the valve body (1), and the diaphragm (6) is installed between the diaphragm valve body mounting plate (4) and the diaphragm motor mounting plate (5); one end of the force transmission mechanism contacts the valve core (9), and the other end passes through the opening of the valve core mounting cavity and the diaphragm valve body mounting plate (4), the diaphragm (6) and the diaphragm motor mounting plate (5) in sequence, and is connected to the voice coil motor; the diaphragm (6) is used to block the liquid in the valve sleeve and the insulating oil in the oil tank (17); The oil tank (17), the voice coil motor, the diaphragm motor mounting plate (5), the diaphragm valve body mounting plate (4), the diaphragm (6) and the force transmission mechanism are all coaxially arranged with the main valve (2).

2. The low-pressure relief valve directly driven by the underwater voice coil motor according to claim 1, characterized in that: The valve sleeve is composed of a front main valve sleeve (7) and a rear main valve sleeve (8), and the valve core installation cavity is composed of the central through holes of the front main valve sleeve (7) and the rear main valve sleeve (8); the main valve liquid inlet is arranged at the front end of the front main valve sleeve (7), and the main valve liquid outlet is arranged on the side of the front main valve sleeve (7), and the main valve liquid inlet and the main valve liquid outlet are both connected to the central through hole of the front main valve sleeve (7); the valve core (9) is installed in the central through hole of the front main valve sleeve (7); The valve body (1) is further provided with a process hole I (103) and a process hole II (105); the process hole II (105) is connected with the liquid outlet (101) and the process hole I (103), and the opening faces the solenoid valve (3); a sealing ring II (104) is installed at the opening of the process hole II (105); a connecting hole is provided on the side of the rear main valve sleeve (8), one end of the process hole I (103) is connected with the connecting hole, and the other end is sealed; the central through hole of the front main valve sleeve (7) and the rear main valve sleeve (8) is connected through the main valve liquid outlet, the liquid outlet (101), the process hole II (105), the process hole I (103) and the connecting hole.

3. The low-pressure relief valve directly driven by the underwater voice coil motor according to claim 2, characterized in that: One end of the rear main valve sleeve (8) is provided with a groove, and one end of the front main valve sleeve (7) extends into the groove to achieve axial positioning of the front main valve sleeve (7) and the rear main valve sleeve (8), so that the front main valve sleeve (7) and the rear main valve sleeve (8) are combined into the valve sleeve; The front end of the valve core (9) is a conical surface, and the inner wall of the front end of the central through hole of the front main valve sleeve (7) is provided with a conical surface. When the low-pressure relief valve is working, the conical surface of the valve core (9) can press against the conical surface of the front end of the central through hole of the front main valve sleeve (7) to form a line contact seal, thereby closing the main valve liquid inlet.

4. The low-pressure relief valve directly driven by an underwater voice coil motor according to claim 1, characterized in that: The force transmission mechanism comprises a valve body force transmission rod (10), a motor force transmission rod (13) and a motor force transmission rod mounting plate (11); One end of the valve body force transmission rod (10) is spherical and contacts the valve core (9), and the other end is fixedly connected to the motor force transmission rod mounting plate (11), and the diaphragm (6) is clamped and fixed between the valve body force transmission rod (10) and the motor force transmission rod mounting plate (11); The motor force transmission rod (13) is provided with external threads at both ends, one end is connected to the threaded hole in the center of the motor force transmission rod mounting plate (11), and the other end is threadedly connected to the voice coil motor mover (16) of the voice coil motor; the center of the voice coil motor mover (16) is provided with a threaded hole for cooperating with the installation of the motor force transmission rod (13).

5. The low-pressure relief valve directly driven by the underwater voice coil motor according to claim 4, characterized in that: The motor force transmission rod (13) is rotatably mounted on the central through hole of the diaphragm motor mounting plate (5) via a linear bearing (14); a linear bearing fixing flange (12) is fixedly mounted on one side of the central through hole of the diaphragm motor mounting plate (5) and is used to axially limit the linear bearing (14); The linear bearing fixing flange (12), the linear bearing (14), the valve body force transmission rod (10), the motor force transmission rod (13) and the motor force transmission rod mounting plate (11) are all coaxially arranged with the main valve (2).

6. The low-pressure relief valve directly driven by the underwater voice coil motor according to claim 1, characterized in that: A sealing ring I (102) is installed between one end of the valve sleeve and the valve core installation cavity; A sealing ring III (108) is installed between the diaphragm valve body mounting plate (4) and the valve body (1); A sealing ring IV (109) and a sealing ring V (110) are respectively installed between the diaphragm motor mounting plate (5), the diaphragm valve body mounting plate (4) and the oil tank (17).

7. The low-pressure relief valve directly driven by an underwater voice coil motor according to claim 5, characterized in that: One side of the diaphragm motor mounting plate (5) is a motor mounting surface (51), and the other side is a first diaphragm mounting surface (52). A central through hole is provided in the center, penetrating the motor mounting surface (51) and the first diaphragm mounting surface (52), for allowing the force transmission mechanism to pass through. The motor mounting surface (51) is provided with a first circular groove for mounting the voice coil motor, and a countersunk through hole is provided in the first circular groove for matching with a threaded hole on the voice coil motor stator (15) of the voice coil motor, so that the voice coil motor stator (15) is mounted in the first circular groove by installing screws; A second circular groove is provided on the first diaphragm mounting surface (52), and a third circular groove is further provided on the bottom surface of the second circular groove; Annular grooves for mounting a sealing ring are respectively provided on the motor mounting surface (51) and the first diaphragm mounting surface (52); One side of the diaphragm valve body mounting plate (4) is a second diaphragm mounting surface (41), the center of which is provided with a central through hole for the force transmission mechanism to pass through; the second diaphragm mounting surface (41) is provided with a first annular boss capable of being embedded in the second circular groove, and the first annular boss and the second circular groove cooperate with each other to enable the diaphragm valve body mounting plate (4) to be mounted on the diaphragm motor mounting plate (5); A second annular boss capable of being embedded in the third circular groove is provided on a surface of the diaphragm (6) facing the diaphragm motor mounting plate (5), and the second annular boss cooperates with the third circular groove to enable the diaphragm (6) to be clamped between the diaphragm motor mounting plate (5) and the diaphragm valve body mounting plate (4).

8. The low-pressure relief valve directly driven by an underwater voice coil motor according to claim 1, characterized in that: The oil tank (17) is provided with a flange at one end facing the diaphragm motor mounting plate (5), and four through holes are provided on the flange at equal intervals along the circumference; a compensator connection port (106) and a watertight connector mounting port (107) are provided at one end of the oil tank (17); The diaphragm valve body mounting plate (4) and the diaphragm motor mounting plate (5) are respectively provided with four through holes at equal intervals along the circumferential direction; The end surface of the valve body (1) facing the diaphragm valve body mounting plate (4) is provided with four threaded holes at equal intervals along the circumferential direction; The valve body (1), the diaphragm valve body mounting plate (4), the diaphragm motor mounting plate (5) and the oil tank (17) are connected by passing four screws through four through holes on the oil tank (17), the diaphragm valve body mounting plate (4) and the diaphragm motor mounting plate (5) in sequence and mounting them to the four threaded holes on the valve body (1).

9. The underwater voice coil motor directly driven low-pressure relief valve according to claim 7, characterized in that: A through hole for the motor force transmission rod (13) to pass through is provided at the center of the linear bearing fixing flange (12), and eight through holes are provided at equal intervals along the circumference; A groove is provided on the first diaphragm mounting surface (52), and the groove can form a cavity with the diaphragm (6); four threaded holes and four through holes are arranged at equal intervals along the circumference in the groove, the threaded holes and the through holes are arranged alternately, and the four threaded holes and the four through holes respectively correspond to the eight through holes on the linear bearing fixing flange (12); the four through holes on the linear bearing fixing flange (12) are connected to the four threaded holes on the first diaphragm mounting surface (52) by screws, so that the linear bearing fixing flange (12) is installed on the diaphragm motor mounting plate (5); the other four through holes on the linear bearing fixing flange (12) are respectively connected to the four through holes on the first diaphragm mounting surface (52), so as to ensure that the cavity is not sealed, so that the insulating oil in the cavity can be sucked in or discharged.

10. The underwater voice coil motor directly driven low-pressure relief valve according to claim 5, characterized in that: The diaphragm (6) is made of a highly elastic material; the valve body (1), the valve core (9), the valve sleeve, the oil tank (17), the diaphragm motor mounting plate (5), the diaphragm valve body mounting plate (4), the linear bearing fixing flange (12), the linear bearing (14), the valve body force transmission rod (10), the motor force transmission rod (13) and the motor force transmission rod mounting plate (11) are all made of corrosion-resistant, high-strength stainless steel.

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