CN218407977U - Inlet feedback type proportional pressure reducing electromagnetic valve - Google Patents

Abstract

The utility model belongs to a solenoid valve, which provides an inlet feedback type proportional pressure reducing solenoid valve, comprising a magnetic field generating assembly, and an armature, a valve core, a spring, a valve body and a valve seat which are coaxially arranged, in order to solve the technical problem that the prior proportional valve can not realize an electric control signal, which not only accurately controls the oil supply pressure of a system, but also accurately controls the pressure of the sub-system; the valve core is connected with or abutted against the armature and moves synchronously with the armature; the valve core is provided with a first through hole along the axial direction, the side wall is provided with an oil inlet communicated with the first through hole, and the outer wall is provided with a first annular bulge and a second annular bulge; the valve body is sleeved outside the valve core; an oil supply port and a pressure relief port are formed in the side wall of the valve body, and the oil supply port is communicated with the annular oil cavity; the valve seat is arranged at one end of the valve body far away from the armature, and a second through hole communicated with the first through hole is formed in the valve seat along the axial direction; one end of the spring is connected with or propped against the limit step in the first through hole, and the other end of the spring is connected with or propped against the limit step in the second through hole.

Description

Inlet feedback type proportional pressure reducing electromagnetic valve

Technical Field

The utility model belongs to a solenoid valve, concretely relates to entry feedback type proportion decompression solenoid valve.

Background

Proportional solenoid valves are widely used in various industries, and are generally used for pressure linear control (proportional pressure regulation) or flow linear control (proportional flow). In order to accurately control the pressure, a proportional pressure regulating type proportional valve generally provides a feedback mechanism for the pressure at the control port of the solenoid valve, so as to balance the force inside the solenoid valve, for example, the chinese patent publication No. CN 103032619A. With the development of automatic control technology, higher requirements are put forward on a core control element proportional solenoid valve, and the requirements are that the proportional control of one proportional solenoid valve to more than 1 control port, the oil supply pressure and the like are realized so as to realize that an electric control signal not only accurately controls the oil supply pressure of a system, but also accurately controls the pressure of the branch system, however, the existing proportional valve cannot meet the control requirements.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve current proportional valve and can't realize an electrical signal and both carried out accurate control to system's fuel feeding pressure, carry out accurate control's technical problem to the divide system's pressure again, provide an entry feedback type proportion decompression solenoid valve.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

an inlet feedback type proportional pressure reducing electromagnetic valve is characterized by comprising a magnetic field generating assembly, an armature, a valve core, a spring, a valve body and a valve seat, wherein the armature, the valve core, the spring, the valve body and the valve seat are coaxially arranged;

the magnetic field generating assembly and the armature form a magnetic field loop, and the magnetic field loop is used for controlling the armature to move according to the electrifying condition of the magnetic field generating assembly;

the valve core is connected with or propped against the armature and synchronously moves with the armature; the valve core is provided with a first through hole along the axial direction, the side wall of the valve core is provided with an oil inlet communicated with the first through hole, and the outer wall of the valve core is provided with a first annular bulge and a second annular bulge;

the valve body is sleeved outside the valve core, a gap is reserved between the valve body and the valve core, and an annular oil cavity is formed in the part of the gap between the first annular bulge and the second annular bulge; an oil supply port and a pressure relief port are formed in the side wall of the valve body, and the oil supply port is communicated with the annular oil cavity; the pressure relief port is communicated with the annular oil cavity when the valve core moves towards the direction far away from the armature and is blocked from the annular oil cavity when the valve core moves towards the direction close to the armature;

the valve seat is arranged at one end of the valve body far away from the armature, a second through hole communicated with the first through hole is formed in the valve seat along the axial direction, and an oil return opening is formed in the second through hole;

one end of the spring is connected with or abutted against the limiting step in the first through hole, and the other end of the spring is connected with or abutted against the limiting step in the second through hole.

Further, the magnetic field generating assembly comprises a yoke, a framework, a stop iron, a pole shoe and a bottom plate;

the yoke, the framework, the stop iron and the armature are sequentially sleeved from outside to inside, the framework is wound with a coil, and the coil is connected with an external power supply system;

the pole shoe is connected to the end face, far away from the valve core, of the yoke, and the inner side of the pole shoe is connected with the stop iron.

Further, the device also comprises a bottom plate and a top rod;

the end faces of the yoke iron, the pole shoe and the stop iron are all connected with the bottom plate, and the bottom plate is positioned at one end far away from the valve core;

the stop iron is provided with a third through hole along the axial direction, a limiting step is arranged in the third through hole, and the armature is positioned between the bottom plate and the limiting step in the third through hole;

the ejector rod is arranged in the third through hole, one end of the ejector rod is connected with the armature, and the other end of the ejector rod is abutted to the valve core.

Furthermore, a fourth through hole is formed in the armature, and the ejector rod is connected with the armature in the fourth through hole.

Furthermore, a wear-resistant film is arranged between the stop iron and the armature iron.

Furthermore, the coil is connected with an external power supply system through a plug connector, and a sealing element is wrapped outside the plug connector.

Further, the device also comprises a mounting plate;

the mounting plate is sleeved outside the stop iron and is positioned at the end face of the valve body close to one end of the armature.

Furthermore, the yoke, the armature, the stop iron and the pole shoe are made of magnetic conductive metal materials, and the surfaces of the yoke, the armature, the stop iron and the pole shoe are coated with wear-resistant and corrosion-resistant coatings.

Furthermore, the valve body, the valve seat, the valve core and the connector are all made of metal materials, and the surfaces of the connector, the valve body and the valve core are coated with wear-resistant and corrosion-resistant coatings;

the ejector rod is made of metal materials;

the wear-resistant film is made of a non-metallic material.

Furthermore, the oil supply port and the pressure relief port are both provided with filter screens.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model relates to an entry feedback type proportion decompression solenoid valve, when the subassembly circular telegram takes place in magnetic field, armature moves to case direction, drive the case motion, make and supply oil mouth and pressure release mouth to pass through annular oil pocket intercommunication, can export certain pressure in pressure release mouth department, and the opening degree of accessible control armature's movement distance control pressure release mouth, and then the pressure size of control output, when the subassembly outage takes place in magnetic field, under the spring force effect of spring, the case is to the direction motion of being close to armature, at this moment, the shutoff of pressure release mouth is gone out to the second annular arch, supply and be blocked between oil mouth and the pressure release mouth. Adopt the utility model discloses, can only take place the circular telegram condition of subassembly, the size of electromagnetic force through control magnetic field, can control whether output pressure to and output pressure's size, simple structure, simple operation, and easily processing and use widely.

2. The utility model discloses the subassembly takes place for the magnetic field that well adoption yoke, skeleton, fender iron, pole shoe and bottom plate are constituteed, simple structure and easily realization can form closed space through the bottom plate.

3. The utility model discloses in through the spacing step in bottom plate and the third through-hole, restricted the motion range of armature, avoid armature to deviate from in the motion process, make the utility model discloses a structure is more reliable.

4. The utility model discloses well armature and case meet through the ejector pin, and the ejector pin is located third through-hole and fourth through-hole, when realizing that armature drives case synchronous motion, make the structure compacter.

5. The utility model discloses the outside parcel of well union piece has the sealing member, has guaranteed the leakproofness of whole solenoid valve, has ensured the installation nature and the reliability of solenoid valve.

6. The utility model discloses be equipped with wear-resisting film between well stop iron and the armature, provide the direction to the armature motion simultaneously, also reduced the frictional force that the armature motion received.

7. The utility model discloses well yoke, armature, stop iron, pole shoe, valve body, disk seat and case surface all coat and have wear-resisting anticorrosive coating, have improved the overall reliability and the durability of solenoid valve.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the inlet feedback type proportional pressure reducing solenoid valve of the present invention.

Wherein: 1-valve seat, 100-second through hole, 2-valve body, 200-oil supply hole, 210-pressure relief hole, 3-spring, 4-filter screen, 5-valve core, 510-first through hole, 520-oil inlet, 530-first annular bulge, 540-second annular bulge, 6-stop iron, 600-third through hole, 7-mounting plate, 8-connector, 9-framework, 10-yoke iron, 11-pole shoe, 12-bottom plate, 13-armature, 1300-fourth through hole, 14-ejector rod, 15-film, 16-annular oil cavity and 17-sealing piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

As shown in fig. 1, the utility model provides an entry feedback type proportion decompression solenoid valve that can control output pressure, take place the subassembly including magnetic field to and armature 13, case 5, spring 3, valve body 2, the disk seat 1 of coaxial setting.

The magnetic field generating assembly and the armature 13 can form a magnetic field loop, and the armature 13 can be controlled to move according to the electrifying condition of the magnetic field generating assembly. The utility model discloses an in one embodiment, the subassembly is taken place to magnetic field includes yoke 10, skeleton 9, fender iron 6, pole shoe 11 and bottom plate 12, and yoke 10, skeleton 9, fender iron 6 and armature 13 are established from outer to interior cover in proper order, and armature 13 slides relative fender iron 6, can set up wear-resisting film 15 between armature 13 and the fender iron 6, when leading armature 13, can reduce the frictional force that armature 13 motion received. The framework 9 is wound with a coil, the coil is connected with an external power supply system through a plug connector, in order to guarantee sealing performance, a sealing element 17 can be wrapped outside the plug connector, a pole shoe 11 is connected to the end face, far away from the valve core 5, of the yoke iron 10, the outer side of the pole shoe 11 is connected with the yoke iron 10, and the inner side of the pole shoe 11 is connected with the stop iron 6. The bottom plate 12 is located at one end far away from the valve core 5, the end faces of the yoke 10, the pole shoe 11 and the stop iron 6 are all connected with the bottom plate 12, in addition, the stop iron 6 is provided with a third through hole 600 along the axial direction, a limit step is arranged in the third through hole 600, the armature 13 is located between the bottom plate 12 and the limit step in the third through hole 600, and the movement range of the armature 13 is controlled between the bottom plate 12 and the limit step in the third through hole 600. In other embodiments of the present invention, the magnetic field generating assembly may also adopt other structures as long as it can generate a magnetic field to control the movement of the armature 13.

In this embodiment, the valve element 5 is connected to the armature 13 through the ejector rod 14, the ejector rod 14 is disposed in the third through hole 600, a fourth through hole 1300 is formed in the armature 13, one end of the ejector rod 14 is located in the fourth through hole 1300 and connected to the armature 13, and the other end of the ejector rod 14 abuts against the valve element 5, when the armature 13 moves toward the valve element 5, the ejector rod 14 is driven to move, the ejector rod 14 can push the valve element 5 to move, when the armature 13 moves away from the valve element 5, the valve element 5 pushes the ejector rod 14 to move, and the armature 13 is driven to move through the ejector rod 14, so that the armature 13 and the valve element 5 can move synchronously. The valve core 5 is provided with a first through hole 130010 along the axial direction, the side wall of the valve core 5 is provided with an oil inlet 520 communicated with the first through hole 130010, the outer wall is provided with a first annular bulge 530 and a second annular bulge 540, and in the embodiment, the second annular bulge 540 is positioned at the end part of the valve core 5 far away from the armature 13. The valve body 2 is sleeved outside the valve core 5, a gap is reserved between the valve body 2 and the valve core 5, the part of the gap between the first annular bulge 530 and the second annular bulge 540 forms an annular oil cavity 16, in addition, an oil supply port 200 (P port) and a pressure relief port 210 (A port) are formed in the side wall of the valve body 2, the oil supply port 200 is always communicated with the annular oil cavity 16, and the pressure relief port 210 is communicated with the annular oil cavity 16 when the valve core 5 moves towards the direction away from the armature 13. In order to prevent the valve core 5 from being blocked due to the external contaminants entering the solenoid valve, a filter screen 4 may be further disposed at the oil supply port 200 and the pressure relief port 210. When the valve core 5 moves towards the direction close to the armature 13, the annular oil chamber 16 is blocked, and the pressure relief opening 210 is blocked by the second annular bulge 540. When the armature 13 drives the valve core 5 to move in a direction away from the armature 13, the second annular bulge 540 shields the right part of the pressure relief opening 210, at the moment, the oil supply opening 200, the annular oil chamber 16 and the pressure relief opening 210 are communicated, when the armature 13 drives the valve core 5 to move in a direction close to the armature 13, the second annular bulge 540 shields the right part of the pressure relief opening 210, at the moment, only the oil supply opening 200 is communicated with the annular oil chamber 16, and the annular oil chamber 16 is isolated from the pressure relief opening 210. Further, when the oil supply port 200, the annular oil chamber 16, and the pressure release port 210 are communicated, by controlling the amount of movement of the armature 13, the width of the pressure release port 210 that is not blocked by the second annular projection 540 can be controlled, and the outflow amount of oil from the pressure release port 210 can be adjusted.

The valve seat 1 is installed at one end, far away from the armature 13, of the valve body 2, the end face of the valve seat 1 is flush with the end face of the valve body 2, the valve seat 1 is provided with a second through hole 100 communicated with the first through hole 130010 in the axial direction, the second through hole 100 forms an oil return opening (T opening), the oil enters the valve core 5 from the annular oil cavity 16 through the oil inlet 520, and then flows out of the oil return opening through the second through hole 100 in the valve seat 1. One end of the spring 3 is connected with or propped against the limit step in the first through hole 130010, the other end of the spring 3 is connected with or propped against the limit step in the second through hole 100, and the spring force of the spring 3 enables the valve core 5 to be pushed to move towards the direction close to the armature 13.

The utility model discloses in, pole shoe 11, yoke 10, armature 13 and armature 13 constitute magnetic circuit, have reduced magnetic field loss, and the slide valve structure is constituteed to valve body 2, disk seat 1, case 5, spring 3, can export corresponding pressure according to the size of electromagnetic force. The utility model discloses a theory of operation does:

the P port (oil supply port 200) is connected with an oil supply line of the system, the A port (pressure relief port 210) is connected with a load oil line, and the T port (second through hole 100) is emptied. The oil pressure of the oil supply acts on the first annular projection 530 and the second annular projection 540 of the valve spool 5 through the oil supply port 200, and the area of the first annular projection 530 is larger than that of the second annular projection 540, so that the oil pressure of the oil supply generates a hydraulic pressure acting on the valve spool 6 in the direction of the spring 3, and the valve spool 5 moves in the direction of the spring. Due to the high pressure at the port P and the low pressure at the port T, the liquid flow rate of the second annular bulge 540 near the pressure relief port 210 arranged on the valve body 2 changes during the transient movement of the valve core 5, so that the liquid static pressure near this region changes. The change in the static pressure causes the hydraulic pressure acting on the spool 5 to be a resultant force of the inlet hydraulic pressure and the relief port 210. When the port A is connected with a low-pressure load, the pressure of the port P is increased, the valve core 5 moves towards the spring 2 to compress the spring 2, the port P is communicated with the port A, the hydraulic resultant force and the spring force balance to maintain the flow area between the port P and the port A, and the pressure of the port P is relieved and reduced to the pressure level of the port A. When port a controls a pressure generating element of port P, such as the pressure and flow control mechanism of a variable displacement pump, port P pressure is further controlled. When the valve core 5 moves to the port P and the port A to be opened instantly and the port A and the port T are closed instantly, the pressure of the port A is increased or decreased. When the valve core 5 moves to the direction of the armature 13, the spring force is larger than the hydraulic resultant force in the direction of the spring 3, the valve core 5 changes the movement direction and moves towards the direction of the armature 13, and the spring force is reduced. When the resultant hydraulic force is greater than the spring force again, the valve core 5 changes the movement direction again to move towards the spring 3, and the reciprocating movement realizes the dynamic force balance.

The coil is electrified to generate a magnetic field, the yoke 10, the pole shoe 11, the armature 13 and the stop iron 6 form a magnetic field loop, the armature 13 moves towards the valve core 5 under the action of magnetic force, the valve core 5 moves towards the right (in the direction of the oil return port T) through the ejector rod 14 acting on the valve core 5, and the oil supply port 200 is communicated with the pressure relief port 210, so that the pressure relief port 210 builds pressure and outputs certain pressure. The electromagnetic force received by the armature 13 acts on the valve core 5, and is in dynamic balance with the spring force and the hydraulic pressure of the spring 3, the electromagnetic force can be adjusted through the PWM signal, the opening degree of the valve core 5 is controlled, and therefore the requirement of controlling the output pressure is met. After the coil is powered off, the magnetic field disappears, the dynamic force balance on the valve core 5 is broken, the spring force of the spring 3 acts on the valve core 5 to push the ejector rod 14 to reset the armature 13, the pressure relief port 210 and the oil supply port 200 are closed, and pressure is not output any more.

In addition, in order to further improve the working reliability of the utility model, the yoke 10, the armature 13, the stop iron 6 and the pole shoe 11 can be made of magnetic conductive metal materials on the selection of each part, and the surface is coated with a wear-resistant and corrosion-resistant coating. The valve body 2, the valve seat 1, the connector 8, the ejector rod 14 and the valve core 5 can be made of metal materials, and the surfaces of the valve body 2, the connector 8 and the valve core 5 can be coated with wear-resistant and corrosion-resistant layers. The membrane 15 may be made of a non-metallic material. The spring 3 may be a cylindrical compression spring 3 made of a metal material. The coil can adopt enameled wire, and the framework 9 can adopt a high-temperature-resistant anti-friction nonmetal coil framework 9.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An inlet feedback type proportional pressure reducing solenoid valve, characterized in that: comprises a magnetic field generating assembly, and an armature (13), a valve core (5), a spring (3), a valve body (2) and a valve seat (1) which are coaxially arranged;

the magnetic field generating assembly and the armature (13) form a magnetic field loop, and the magnetic field loop is used for controlling the movement of the armature (13) according to the electrifying condition of the magnetic field generating assembly;

the valve core (5) is connected with or abutted against the armature (13) and synchronously moves with the armature (13); the valve core (5) is provided with a first through hole (510) along the axial direction, the side wall of the valve core (5) is provided with an oil inlet (520) communicated with the first through hole (510), and the outer wall of the valve core is provided with a first annular bulge (530) and a second annular bulge (540);

the valve body (2) is sleeved outside the valve core (5), a gap is reserved between the valve body (2) and the valve core (5), and a part of the gap between the first annular bulge (530) and the second annular bulge (540) forms an annular oil cavity (16); an oil supply port (200) and a pressure relief port (210) are formed in the side wall of the valve body (2), and the oil supply port (200) is communicated with the annular oil cavity (16); the pressure relief opening (210) is communicated with the annular oil cavity (16) when the valve core (5) moves towards the direction far away from the armature (13), and is blocked from the annular oil cavity (16) when the valve core (5) moves towards the direction close to the armature (13);

the valve seat (1) is installed at one end, far away from the armature (13), of the valve body (2), a second through hole (100) communicated with the first through hole (510) is formed in the valve seat (1) in the axial direction, and an oil return opening is formed in the second through hole (100);

one end of the spring (3) is connected with or propped against the limiting step in the first through hole (510), and the other end of the spring is connected with or propped against the limiting step in the second through hole (100).

2. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 1, wherein: the magnetic field generating assembly comprises a yoke (10), a framework (9), a stop iron (6), a pole shoe (11) and a bottom plate (12);

the yoke (10), the framework (9), the stop iron (6) and the armature (13) are sequentially sleeved from outside to inside, a coil is wound on the framework (9), and the coil is connected with an external power supply system;

the pole shoe (11) is connected to the end face, far away from the valve core (5), of the yoke iron (10), and the inner side of the pole shoe (11) is connected with the stop iron (6).

3. The inlet feedback type proportional pressure reducing solenoid valve as claimed in claim 2, wherein: the device also comprises a bottom plate (12) and a top rod (14);

the end faces of the yoke (10), the pole shoe (11) and the stop iron (6) are connected with a bottom plate (12), and the bottom plate (12) is positioned at one end far away from the valve core (5);

the stop iron (6) is provided with a third through hole (600) along the axial direction, a limiting step is arranged in the third through hole (600), and the armature (13) is positioned between the bottom plate (12) and the limiting step in the third through hole (600);

the ejector rod (14) is arranged in the third through hole (600), one end of the ejector rod is connected with the armature iron (13), and the other end of the ejector rod is abutted to the valve core (5).

4. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 3, wherein: a fourth through hole (1300) is formed in the armature (13), and the ejector rod (14) is connected with the armature (13) in the fourth through hole (1300).

5. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 3 or 4, wherein:

and a wear-resistant film (15) is arranged between the stop iron (6) and the armature iron (13).

6. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 5, wherein: the coil is connected with an external power supply system through a plug connector, and a sealing element (17) is wrapped outside the plug connector.

7. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 6, wherein: also comprises a mounting plate (7);

the mounting plate (7) is sleeved outside the stop iron (6) and is positioned at the end face of the valve body (2) close to one end of the armature iron (13).

8. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 7, wherein:

the yoke (10), the armature (13), the stop iron (6) and the pole shoe (11) are all made of magnetic conductive metal materials, and the surfaces of the yoke, the armature (13), the stop iron (6) and the pole shoe are coated with wear-resistant and corrosion-resistant coatings.

9. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 8, wherein:

the valve body (2), the valve seat (1), the valve core (5) and the connector (8) are all made of metal materials, and the surfaces of the connector (8), the valve body (2) and the valve core (5) are coated with wear-resistant anticorrosive coatings;

the ejector rod (14) is made of metal material;

the wear-resistant film (15) is made of a non-metal material.

10. The inlet feedback type proportional pressure reducing solenoid valve as set forth in claim 9, wherein: the oil supply port (200) and the pressure relief port (210) are both provided with filter screens (4).

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