CN218267524U - Electromagnetic pilot valve - Google Patents

Abstract

The utility model relates to a solenoid valve technical field, its purpose provides an electromagnetism pilot valve. The sealing surface of the electromagnetic pilot valve is not easy to lose efficacy, and the stroke ejector rod is not easy to wear and is not easy to deform and clamp. The electromagnetic pilot valve comprises: the valve body and the electromagnet assembly, the lever assembly and the valve core assembly in the valve body; the valve core assembly comprises a valve sleeve and a valve rod assembly in the valve sleeve, and the electromagnet assembly drives the lever assembly to rotate around the rotating shaft so as to drive the valve rod assembly to linearly move along the axial direction; the valve rod assembly comprises a balance rod, a stroke ejector rod and a spring ejector rod which are sequentially connected, a sealing valve seat is sleeved outside the stroke ejector rod, one end of the sealing valve seat is in contact with the end face of the balance rod or the other end of the sealing valve seat is in contact with the end face of the spring ejector rod, and the joint face of the sealing valve seat, the balance rod and the spring ejector rod is a sealing face. The utility model provides an among the prior art electromagnetism pilot valve adopt ceramic ball and metal base sealed, sealed face easily became invalid, and the stroke pole easily wears and teares, yielding card dies, leads to the problem that the electromagnetism pilot valve became invalid.

Description

Electromagnetic pilot valve

Technical Field

The utility model relates to a solenoid valve technical field, concretely relates to electromagnetism pilot valve.

Background

The emulsion pump station is a power source for providing hydraulic power for the hydraulic support, so that the hydraulic support can complete pushing, pulling and other actions, most of the emulsion pump stations in China currently adopt reciprocating plunger type hydraulic pumps, but the pumps are constant displacement pumps, the output liquid flow is not adjustable, and the liquid flow required by the hydraulic support during actual working is variable, so that the pumps cannot be matched with the flow required by the hydraulic support during real-time working. In order to solve the problem, an unloading valve is adopted in an emulsion pump station to regulate the liquid flow output to a working surface by a hydraulic pump, and an electromagnetic pilot valve is an important control element for controlling the action of the unloading valve.

Adopt ceramic ball and metal base to seal in the current electromagnetic pilot valve case cluster, the stroke pole setting in the case cluster is in the metal base, and the both ends of stroke pole and ceramic ball butt and move along with the case cluster, and the one end and the ceramic ball contact of metal base realize sealedly. Because the sealing strip of the metal seat and the ceramic ball is narrow, the contact stress of the sealing surface is large, and the sealing surface is easy to lose efficacy after multiple cycles. The stroke rod is in point contact with the ceramic ball point, and is easy to wear when the stroke rod acts, so that the stroke rod is shortened, and finally the electromagnetic pilot valve cannot reach the specified stroke and fails. And the stroke rod and the ceramic ball are in point contact, so that the phenomenon that the contact point is not overlapped with the axis of the stroke rod easily occurs when the stroke rod moves, the stroke rod is stressed unevenly and is easy to deform and block.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the electromagnetism pilot valve among the prior art and adopting ceramic ball and metal base sealed, sealed face inefficacy easily, stroke pole easy wear, yielding card die, lead to the easy defect of inefficacy of electromagnetism pilot valve to a sealed face is difficult for inefficacy, stroke pole difficult wear, the difficult deformation card die electromagnetism pilot valve is provided.

Therefore, the utility model provides an electromagnetic pilot valve, which comprises a valve body, an electromagnet assembly, a lever assembly and a valve core assembly, wherein the electromagnet assembly, the lever assembly and the valve core assembly are arranged in the valve body;

the valve element assembly comprises a valve sleeve and a valve rod assembly arranged in the valve sleeve, the power input end of the lever assembly is connected with the force application end of the electromagnet assembly, the power output end of the lever assembly is connected with the force application end of the valve rod assembly, and the electromagnet assembly drives the lever assembly to rotate around the rotating shaft of the lever assembly so as to drive the valve rod assembly to move linearly along the axial direction;

the valve rod assembly comprises a balance rod, a stroke ejector rod and a spring ejector rod which are sequentially connected, a sealing valve seat is sleeved outside the stroke ejector rod, the axial length of the stroke ejector rod is larger than that of the sealing valve seat, when the valve rod assembly performs axial linear motion relative to the sealing valve seat, one end of the sealing valve seat is in contact with the end face of the balance rod or the other end of the sealing valve seat is in contact with the end face of the spring ejector rod, and the joint face of the sealing valve seat, the balance rod and the spring ejector rod is a sealing face.

Optionally, the lever assembly includes a lever, one end of the lever is hinged to the valve body through the rotating shaft, the other end of the lever is the power input end and is connected to the force application end of the electromagnet assembly, and the position of the lever close to the hinged point is the power output end and is connected to the force application end of the valve core assembly.

Optionally, a contact rod is arranged on a side wall of the lever close to the hinge point position of the lever, and the contact rod is embedded into the side wall.

Optionally, the power input end of the lever is provided with a sliding groove, a roller is arranged in the sliding groove, and a wheel surface of the roller is in contact with the force application end of the electromagnet assembly.

Optionally, the outer wall of the stroke ejector rod is provided with a ring groove formed around the circumferential direction, the outer wall of the stroke ejector rod is further provided with a through groove formed along the axial direction, and the through groove is communicated with the ring groove.

Optionally, the spool assembly further comprises a first balance bar mounting seat arranged outside the balance bar in a sleeved mode, the balance bar is connected with the first balance bar mounting seat in a sliding mode, and a limiting mechanism is arranged between the balance bar and the first balance bar mounting seat and used for limiting the distance of the balance bar moving towards the direction close to the lever assembly.

Optionally, the limiting mechanism comprises a limiting step formed on the inner wall of the first balance rod mounting seat and a limiting boss arranged on the outer wall of one end, close to the stroke ejector rod, of the balance rod, and the limiting boss is suitable for being connected with the limiting step in a matched and clamped mode.

Optionally, the electromagnet assembly includes: the movable iron core is inserted in the groove in a sliding manner; at least one through air hole is formed in the movable iron core, and the axial direction of the air hole is parallel to the movement direction of the movable iron core.

Optionally, a spacer is arranged in the groove.

Optionally, move the iron core and keep away from the one end of quiet iron core is connected with the back ejector pin, the back ejector pin is kept away from the one end of moving the iron core is provided with elasticity reset assembly, elasticity reset assembly include first elasticity reset element and shaping in the back ejector pin is kept away from move the joint portion of the one end of iron core, first elasticity reset element cover is established on the back ejector pin, just first elasticity reset element one end with joint portion butt, the other end with the valve body butt.

The utility model has the advantages of it is following:

1. the utility model provides an electromagnetic pilot valve, including valve body and the electromagnet assembly who sets up in the valve body, lever subassembly and case subassembly, the case subassembly includes the valve barrel and sets up the valve rod subassembly in the valve barrel, valve rod subassembly is including the balancing pole that connects gradually, stroke ejector pin and spring ejector pin, stroke ejector pin overcoat is equipped with sealed disk seat, because the axial length of stroke ejector pin is greater than the axial length of sealed disk seat, and the position of sealed disk seat is immovable, so when electromagnet assembly drive lever subassembly rotates around its pivot and drives valve rod subassembly along axial motion, the one end of sealed disk seat can with the terminal surface contact of balancing pole or the other end of sealed disk seat can with the terminal surface contact of spring ejector pin, and sealed disk seat and balancing pole, the faying face of spring ejector pin is exactly sealed, directly realize sealing through the contact surface promptly, no longer adopt sealing members such as ceramic ball to go to seal. Compared with sealing methods of sealing elements such as ceramic balls and the like, the sealing method has the advantages that the sealing area is large, the sealing surface is not prone to failure, the number of the sealing elements is reduced, the structure is simplified, and the equipment cost is also reduced. The stroke ejector rod is in surface contact with the balance rods on the two sides and the spring ejector rod instead of point contact, so that the stroke ejector rod is not easy to wear when acting, the stroke ejector rod is coaxially arranged with the balance rods and the spring ejector rod, the direction of the acting force transmitted from the lever assembly can be axially coincided with the stroke ejector rod, the stroke ejector rod is uniform in stress and can move axially, the movement track does not deviate, the stroke ejector rod cannot deform and be clamped in a sealing valve seat, the electromagnetic pilot valve cannot be caused to lose efficacy, and the service life is longer.

2. The utility model provides an electromagnetic pilot valve, the lateral wall that the lever in the lever subassembly is close to the pin joint position is provided with the contact bar, and the contact bar imbeds the lateral wall of lever to be connected with the atress end of case subassembly. When the lever rotates to drive the valve rod assembly in the valve core assembly to move, the contact rod and the stressed end of the valve core assembly are in rolling friction, the friction force is small, and the abrasion between the contact rod and the valve rod assembly can be reduced. In addition, the lever is not provided with an adjusting mechanism such as an adjusting screw, namely, the output proportion of the lever is fixed and invariable and nonadjustable, and the distance between the power output end of the lever and the hinge point is smaller, namely, the force arm is smaller, so that the change of the output force of the lever is larger even if the force arm adjusting quantity of the power output end of the lever is smaller, the force applied to the valve rod assembly is overlarge, and the failure of the valve rod assembly is caused. Therefore, the output proportion of the lever is set to be fixed, the valve rod assembly can be prevented from being damaged due to overlarge stress, and the service life of the valve rod assembly can be prolonged.

3. The utility model provides an electromagnetism pilot valve, the power input end of lever has the spout, sets up the gyro wheel in the spout, and the wheel face of gyro wheel contacts with the application of force end of electromagnetism subassembly. When the force application end of the electromagnetic assembly applies acting force to enable the lever to rotate, the force application end of the electromagnetic assembly and the roller are in rolling friction, the friction force is small, and the force application end of the lever or the electromagnetic assembly is not easy to wear and damage after long-term work. The performance of the lever and the electromagnetic assembly is improved, and the service life of the lever and the electromagnetic assembly is prolonged.

4. The utility model provides an electromagnetic pilot valve, balancing pole overcoat are equipped with first balancing pole mount pad, and first balancing pole mount pad inner wall shaping has spacing step, and the balancing pole shaping has a spacing boss on being close to the one end outer wall of stroke ejector pin, and spacing boss can carry on spacingly with spacing step joint to the balancing pole, can avoid the balancing pole stroke too big, and the dynamic seal wears and loses efficacy for a long time. The balance rod can be effectively limited by the aid of the limiting steps and the limiting bosses, the service life of the dynamic seal of the balance rod is prolonged, the maintenance and replacement times of the dynamic seal are reduced, and the performance of a product is improved.

5. The utility model provides an electromagnetic pilot valve, the internal shaping of moving iron core among the electro-magnet subassembly has at least one air vent that link up, and the axial of air vent is parallel with the direction of motion of moving the iron core, and when moving the iron core motion, the air that moves the iron core both sides can be through the air vent circulation, reduces the air resistance that moves the iron core and receive when the motion, makes its motion more smooth and easy, steady.

6. The utility model provides an electromagnetic pilot valve, quiet iron core are close to the one end of moving the iron core and are provided with the recess, move iron core and recess sliding connection, and are provided with the spacer in the recess. Move the iron core and slide in the recess under the attraction of quiet iron core, but move the iron core and can grow by the appeal when being close to the bottom position of recess, lead to moving the iron core and move the excessive speed to the power of output to the lever takes place the catastrophe. The movement of the movable iron core can be kept in a uniform and gentle state by arranging the spacing pieces, and the force output to the lever is basically kept stable.

7. The utility model provides an electromagnetic pilot valve moves the iron core and keeps away from the one end of quiet iron core and be connected with back ejector pin, and the one end that moves the iron core was kept away from to back ejector pin is provided with elastic reset element, and elastic reset element that resets includes first elastic reset element and shaping and keeps away from the joint portion that moves iron core one end in back ejector pin, first elastic reset element's one end and joint portion butt, the other end and valve body butt. The valve rod assembly can be reset by providing the elastic reset assembly to provide certain spring force, so that the elastic rigidity of the second elastic reset element in the valve core assembly and the required spring force are reduced, meanwhile, the stress of the valve rod assembly is reduced, and the service life of the valve rod assembly can be prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an embodiment 1 of the electromagnetic pilot valve of the present invention;

fig. 2 is a schematic view of a lever assembly and a valve core assembly in an embodiment 1 of the electromagnetic pilot valve of the present invention;

FIG. 3 is a partially enlarged view of portion A of FIG. 2;

fig. 4 is a schematic view of an electromagnet assembly in the electromagnetic pilot valve of the present invention in embodiment 1;

fig. 5 is a schematic view of the connection of an oil port in embodiment 1 of the electromagnetic pilot valve of the present invention;

fig. 6 is a schematic view of the connection of the oil port in embodiment 2 of the electromagnetic pilot valve of the present invention.

Description of reference numerals:

1. a valve body;

2. the electromagnetic valve comprises an electromagnet assembly, 201, a static iron core, 2011, a groove, 202, a movable iron core, 2021, a vent hole, 203, a spacing piece, 204, a rear ejector rod, 2041, a clamping part, 205, a first elastic resetting element, 206, a coil, 207, a front ejector rod, 208, a sealing ring, 209 and a bearing;

3. the lever assembly comprises a lever assembly 301, a rotating shaft 302, a lever 303, a contact rod 304, a sliding groove 305 and a roller;

4. the valve core assembly comprises a valve core assembly 401, a valve sleeve 402, a valve rod assembly 4021, a balance rod 40211, a limiting boss 4022, a stroke ejector rod 40221, an annular groove 40222, a through groove 4023, a spring ejector rod 4024, a valve core ejector rod 403, a sealing valve seat 404, a first balance rod mounting seat 4041, a limiting step 405, a second balance rod mounting seat 406, a spring ejector rod mounting seat 407 and a second elastic reset element;

5. a junction box.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, for the preferred embodiment of the electromagnetic pilot valve of the present invention, the sealing surface of the electromagnetic pilot valve is not easy to lose efficacy, and the stroke ejector pin 4022 is not easy to wear and deform, so that the electromagnetic pilot valve is not easy to damage and has a longer service life.

The electromagnetic pilot valve includes: valve body 1 and electromagnet assembly 2, lever assembly 3 and case subassembly 4 of setting in valve body 1, case subassembly 4 includes valve barrel 401 and the valve rod assembly 402 of setting in valve barrel 401, and lever assembly 3's power input end is connected with electromagnet assembly 2's application of force end, and lever assembly 3's power output end is connected with valve rod assembly 402's stress end, and electromagnet assembly 2 can drive lever assembly 3 and rotate in order to drive valve rod assembly 402 along axial linear motion around its pivot 301.

Further, as shown in fig. 2, the valve rod assembly 402 includes a valve core ejector pin 4024, a balance rod 4021, a stroke ejector pin 4022, and a spring ejector pin 4023, which are connected in sequence, and one end of the valve core ejector pin 4024, which is far away from the balance rod 4021, is a stressed end of the valve rod assembly 402, and is connected to a power output end of the lever assembly 3. The left end and the right end of the valve core ejector rod 4024, the balance rod 4021, the stroke ejector rod 4022 and the spring ejector rod 4023 are both planes, so the connecting surfaces between the valve core ejector rod 4024, the balance rod 4021, the stroke ejector rod 4022 and the spring ejector rod 4023 are all planes, compared with the existing connecting mode through ceramic balls, the plane contact has less wear to the valve core ejector rod 4024, the balance rod 4021, the stroke ejector rod 4022 and the spring ejector rod 4023, and the valve rod assembly 402 can be used for a long time without causing the failure of the electromagnetic pilot valve due to wear. The force transmitted to the valve rod assembly 402 from the power output end of the lever assembly 3 is parallel to the movement direction of the valve rod assembly 402, and the stroke ejector rods 4022 are even in stress and difficult to deform and clamp.

The middle part of the valve core ejector rod 4024 is connected with the valve sleeve 401 in a clamping mode, one end of the valve core ejector rod 4024 is a stressed end of the valve rod assembly 402 and extends out of the outer side of the valve sleeve 401, the other end of the valve core ejector rod 4024 is connected with the balance rod 4021, and a second balance rod mounting seat 405 is sleeved at the connection position; the balance bar 4021 is further sleeved with a first balance bar mounting base 404, and the first balance bar mounting base 404 is provided with two liquid passages which are respectively communicated with a C1 oil port on the valve body 1 and a C3 oil port on the valve body 1. The first balance bar mounting seat 404 and the second balance bar mounting seat 405 are both fixedly disposed in the valve housing 401, and are disposed at an interval. The balance bar 4021 is slidably connected to the first balance bar mounting base 404, and a limiting mechanism is arranged between the balance bar 4021 and the first balance bar mounting base 404, and is used for limiting the distance of the balance bar 4021 moving towards the direction close to the lever assembly 3. Specifically, as shown in fig. 3, the limiting mechanism includes a limiting step 4041 formed on the inner wall of the first balance bar mounting seat 404 and a limiting boss 40211 arranged on the outer wall of the end, close to the stroke ejector pin 4022, of the balance bar 4021, and the limiting boss 40211 is suitable for being clamped with the limiting step 4041, so that the dynamic seal is prevented from being damaged due to an excessively long movement distance of the balance bar 4021.

The stroke push rod 4022 is externally sleeved with a sealing valve seat 403, and the sealing valve seat 403 is fixedly arranged in the valve sleeve 401. Specifically, a through hole is formed in the middle of the seal valve seat 403, the stroke ejector pin 4022 is arranged in the through hole, the diameter of the through hole is larger than that of the stroke ejector pin 4022, and the axial length of the stroke ejector pin 4022 is larger than that of the seal valve seat 403. When the valve rod assembly 402 performs axial linear motion relative to the seal valve seat 403, one end of the seal valve seat 403 contacts with the end surface of the balance rod 4021 or the other end of the seal valve seat 403 contacts with the end surface of the spring ejector pin 4023, the joint surface between the seal valve seat 403 and the balance rod 4021 and the spring ejector pin 4023 is a sealing surface, and in this embodiment, the two end surfaces of the seal valve seat 403 are also planes, so the sealing surfaces between the seal valve seat 403 and the balance rod 4021 and the spring ejector pin 4023 are planes. The sealing mode generates pressing force on the joint surface through fluid pressure, so that the two contact end surfaces are tightly attached, and the joint stress is multiplied by more than medium pressure, thereby achieving the purpose of sealing. The sealing mode has good stability, and the service life of the balance rod 4021, the spring ejector rod 4023 and the sealing valve seat 403 is longer.

In addition, as shown in fig. 3, an annular groove 40221 formed around the circumferential direction is formed in the outer wall of the stroke ejector pin 4022, the annular groove 40221 is communicated with a C2 oil port formed in the valve body 1, a through groove 40222 formed in the axial direction is further formed in the outer wall of the stroke ejector pin 4022, the through groove 40222 is communicated with the annular groove 40221, and oil flowing from the C2 oil port can flow to two sides of the stroke ejector pin 4022 through the groove 40222.

A spring ram mounting seat 406 is further sleeved on the outer side of the spring ram 4023, and the spring ram mounting seat 406 is fixedly arranged in the valve sleeve 401 and is provided with a liquid channel communicated with an oil port C1 on the valve body 1. A second elastic return element 407 is provided in the spring jack mount 406, and one end of the second elastic return element 407 abuts against the spring jack 4023 and the other end abuts against the inner wall of the spring jack mount 406. Specifically, the second elastic restoring element 407 in this embodiment is a spring.

As shown in FIG. 2, when the valve stem assembly 402 is in the position shown, the C2 port is in communication with the C3 port. The lever assembly 3 drives the valve rod assembly 402 to move to the right, and at the moment, the second elastic reset element 407 is compressed, so that the oil port C2 is communicated with the oil port C1; when the lever assembly 3 does not apply any more force, the second elastic reset element 407 drives the valve rod assembly 402 to move to the left side, so as to complete the reset, and at this time, the C2 oil port is communicated with the C3 oil port again. The flow direction of the liquid flowing into the electromagnetic pilot valve can be changed through the lever assembly 3 and the second elastic reset element 407, so that the reversing function of the electromagnetic pilot valve is realized.

As shown in fig. 3, the lever assembly 3 includes a lever 302, one end of the lever 302 is hinged to the valve body 1 through a rotating shaft 301, a position close to the hinged point is a power output end and is connected to a force bearing end of the valve core assembly 4, and the other end of the lever 302 is a power input end and is connected to a force application end of the electromagnet assembly 2. Specifically, the lever 302 in this embodiment is preferably an L-shaped rod, and the overall length of the L-shaped rod is shorter than that of a common straight rod, so that the electromagnetic pilot valve has a smaller volume and a compact structure. The side wall of the lever 302 near the hinge point is provided with a contact rod 303, and the contact rod 303 is embedded in the side wall, in this embodiment, the contact rod 303 is preferably a rod-shaped structure made of wear-resistant material. The contact rod 303 is in contact with the valve core post 4024 of the valve rod assembly 402, and the position where the contact rod 303 is in contact with the valve core post 4024 is the power output end. When the lever 302 rotates around the rotating shaft 301, rolling friction is generated between the contact rod 303 and the valve core ejector rod 4024, friction resistance is small, and abrasion of the end face, in contact with the contact rod 303, of the valve core ejector rod 4024 is reduced.

The power input end of the lever 302 is provided with a sliding groove 304, a roller 305 is fixedly arranged in the sliding groove 304, and the axis of the roller 305 is perpendicular to the axis of the sliding groove 304. The outer edge of the roller 305 protrudes from the outer wall of the power input end of the lever 302 so that the tread of the roller 305 can be brought into contact with the force application end of the electromagnet assembly 2. The wheel surface of the roller 305 and the force application end of the electromagnet assembly 2 are also rolling friction, so that the friction resistance is small and the abrasion is reduced.

As shown in fig. 4, the electromagnet assembly 2 includes: quiet iron core 201, move iron core 202 and coil 206, coil 206 sets up in quiet iron core 201 and move the iron core 202 outside, and quiet iron core 201 is fixed to be set up in valve body 1, and quiet iron core 201 is close to and moves iron core 202 one end and be provided with recess 2011, moves iron core 202 and recess 2011 sliding connection, is provided with spacer 203 in the recess 2011. In addition, at least one through air hole 2021 is formed in the movable core 202, and the axial direction of the air hole 2021 is parallel to the moving direction of the movable core 202. Specifically, in this embodiment, the movable iron core 202 is provided with two air vents 2021, and when the movable iron core 202 slides in the groove 2011, air on two sides of the movable iron core 202 can circulate through the air vents 2021, so as to reduce air resistance when the movable iron core 202 moves, and thus the movable iron core 202 moves stably and smoothly.

When the coil 206 is energized to generate a magnetic field, the stationary core 201 attracts the movable core 202, and the movable core 202 moves toward the stationary core 201, so that the movable core 202 slides in the groove 2011, and when the movable core 202 moves to a position to be in contact with the stationary core 201, the attraction of the stationary core 201 is large, which results in that the moving speed of the movable core 202 is rapidly increased. The spacer 203 is arranged in the groove 2011, so that the movement speed of the movable iron core 202 can be prevented from changing greatly, and the movable iron core 202 can keep stable and uniform when moving.

The electromagnet assembly 2 further comprises: the front ejector rod 207 and the rear ejector rod 204, one end of the front ejector rod 207 is fixedly connected with the movable iron core 202, and the other end is connected with the static iron core 201 in a sliding mode and extends out of the side wall of the static iron core 201 far away from the movable iron core 202. And a bearing 209 is arranged on one side of the static iron core 201 far away from the movable iron core 202, and the front ejector rod 207 is rotatably connected with the bearing 209 to realize position fixing. Furthermore, a sealing ring 208 is provided at an interval on the side of the bearing 209 close to the plunger 202 to prevent water vapor in the air from entering the inside of the electromagnet assembly 2. The end of the front top rod 207 extending out of the side wall of the stationary iron core 201 far away from the movable iron core 202 is the force application end of the electromagnet assembly 2, and the front top rod 207 extends out of the side wall of the stationary iron core 201 and contacts with the roller 305 on the lever 302.

One end of the rear ejector rod 204 and one end of the movable iron core 202 far away from the stationary iron core 201 are fixedly connected, the other end of the rear ejector rod is in sliding connection with the valve body 1 and extends out of the side wall of the valve body 1 far away from the movable iron core 202, a bearing 209 is arranged on the side wall, and the rear ejector rod 204 is rotatably connected with the bearing 209 to realize position fixing. And one end of the rear ejector rod 204 far away from the movable iron core 202 is provided with an elastic reset component. Specifically, the elastic reset assembly comprises: the first elastic reset element 205 and the clamping portion 2041 are formed at one end, far away from the movable iron core 202, of the rear ejector rod 204, the first elastic reset element 205 is sleeved on the rear ejector rod 204, one end of the first elastic reset element 205 is abutted to the clamping portion 2041, and the other end of the first elastic reset element is abutted to the side wall, far away from the movable iron core 202, of the valve body 1. In this embodiment, the first elastic return element 205 is preferably a spring.

An end cover covers the outer side of the clamping portion 2041 of the rear ejector rod 204 and is fixedly connected with the valve body 1 through a bolt, and a sealing ring 208 is arranged at the joint of the end cover and the valve body 1 to prevent water vapor in the air from entering the valve body 1, so that the electromagnet assembly is disabled and damaged.

In addition, the electromagnetic pilot valve further comprises a junction box 5, wherein the junction box 5 is fixedly arranged on the valve body 1, is communicated with a coil 206 of the electromagnet assembly 2, and supplies power to the coil 206.

The following describes the operation process of the electromagnetic pilot valve provided in this embodiment:

the electromagnetic pilot valve is provided with three oil ports, namely C1 oil ports, C2 oil ports and C3 oil ports. As shown in fig. 5, the C1 oil port is connected to the high pressure port of the system, the C2 oil port is connected to the control port of the valve to be controlled, the valve to be controlled in this embodiment is an unloading valve, that is, the C2 oil port is connected to the control port of the unloading valve, and the C3 oil port is connected to the low pressure port of the system. When the electromagnetic pilot valve is not electrified, the electromagnetic pilot valve is in a left state shown in fig. 5, at this time, C2 is communicated with C3, and the electromagnetic pilot valve does not control the unloading valve; when the electromagnetic pilot valve is electrified, the coil 206 is electrified to generate a magnetic field, the stationary iron core 201 attracts the movable iron core 202 to move towards one side close to the stationary iron core 201, and the movable iron core 202 can synchronously drive the front ejector rod 207 and the rear ejector rod 204 fixedly connected with the movable iron core 202 to move towards one side close to the stationary iron core 201 when sliding in the groove 2011. The front push rod 207 applies a force to the power input end of the lever 302, that is, the front push rod 207 applies a force to the roller 305, so as to rotate the lever 302 around the rotating shaft 301. The contact bar 303 on the lever 302 will apply a corresponding force to the force-bearing end of the valve stem assembly 402. The valve rod assembly 402 performs axial linear motion under the action of the lever 302, the valve core ejector rod 4024, the balance rod 4021, the stroke ejector rod 4022 and the spring ejector rod 4023 all move to the side far away from the power output end of the lever 302, and at the moment, the spring ejector rod 4023 also compresses the second elastic reset element 407. When the stroke ejector pin 4022 moves to the side far away from the power output end of the lever 302, the end face of the balance rod 4021 is in contact with the sealing valve seat 403 to realize sealing, the end face of the spring ejector pin 4023 which is originally in contact with the end face of the sealing valve seat 403 is separated, so that the oil ports of the C1 oil port and the C2 oil port are communicated, and oil in the oil port of the C1 oil port enters the oil port of the C2 oil port through the through groove 40222 and the annular groove 40221 on the stroke ejector pin 4022. At this time, the electromagnetic pilot valve is in the right position shown in fig. 5, and the electromagnetic pilot valve can control the unloading valve to open the unloading valve.

When the unloading valve needs to be closed, the coil 206 is powered off, at this time, attraction force no longer exists between the movable iron core 202 and the static iron core 201, the movable iron core 202 is reset under the action of the first elastic reset element 205, namely, the movable iron core 202 moves to one side far away from the static iron core 201; the valve rod assembly 402 is reset by the second elastic reset element 407, that is, the valve rod assembly 402 moves to the side close to the power output end of the lever assembly 3 and pushes the lever 302 to rotate around the rotating shaft 301. The end face of the spring plunger 4023 makes renewed contact with the end face of the seal valve seat 403 and a seal is achieved. The C2 port is no longer in communication with the C1 port but is again in communication with the C3 port.

In other embodiments, the number of the vent holes 2021 on the plunger 202 may also be three, four, etc.

Example 2

The present embodiment is different from embodiment 1 in the connection manner of the electromagnetic pilot valve. As shown in fig. 6, the C1 oil port is closed, the C2 oil port is connected to the system high pressure port, and the C3 oil port is connected to the low pressure port or the control port of the valve to be controlled. The structure of the electromagnetic pilot valve is the same as that described in embodiment 1, and therefore, the description thereof is omitted.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. The electromagnetic pilot valve is characterized by comprising a valve body (1), and an electromagnet assembly (2), a lever assembly (3) and a valve core assembly (4) which are arranged in the valve body (1);

the valve core assembly (4) comprises a valve sleeve (401) and a valve rod assembly (402) arranged in the valve sleeve (401), the power input end of the lever assembly (3) is connected with the force application end of the electromagnet assembly (2), the power output end of the lever assembly (3) is connected with the force application end of the valve rod assembly (402), and the electromagnet assembly (2) drives the lever assembly (3) to rotate around the rotating shaft (301) of the lever assembly to drive the valve rod assembly (402) to move linearly along the axial direction;

the valve rod assembly (402) comprises a balance rod (4021), a stroke ejector rod (4022) and a spring ejector rod (4023) which are sequentially connected, a seal valve seat (403) is sleeved outside the stroke ejector rod (4022), the axial length of the stroke ejector rod (4022) is greater than that of the seal valve seat (403), when the valve rod assembly (402) performs axial linear motion relative to the seal valve seat (403), one end of the seal valve seat (403) is in contact with the end face of the balance rod (4021) or the other end of the seal valve seat (403) is in contact with the end face of the spring ejector rod (4023), and the joint faces of the seal valve seat (403), the balance rod (4021) and the spring ejector rod (4023) are seal faces.

2. The electromagnetic pilot valve according to claim 1, wherein the lever assembly (3) comprises a lever (302), one end of the lever (302) is hinged to the valve body (1) through the rotating shaft (301), the other end of the lever is the power input end and is connected to the force application end of the electromagnet assembly (2), and the position of the lever (302) close to the hinged point is the power output end and is connected to the force application end of the valve core assembly (4).

3. The electromagnetic pilot valve according to claim 2, characterized in that a side wall of the lever (302) near its hinge point position is provided with a contact rod (303), and the contact rod (303) is embedded in the side wall.

4. The electromagnetic pilot valve according to claim 2, wherein the power input end of the lever (302) has a sliding slot (304), a roller (305) is arranged in the sliding slot (304), and a wheel surface of the roller (305) is in contact with the force application end of the electromagnet assembly (2).

5. The electromagnetic pilot valve according to claim 1, wherein an annular groove (40221) formed around a circumferential direction is formed in an outer wall of the stroke ejector rod (4022), a through groove (40222) formed along an axial direction is further formed in an outer wall of the stroke ejector rod (4022), and the through groove (40222) is communicated with the annular groove (40221).

6. The electromagnetic pilot valve according to claim 1, wherein the spool assembly (4) further comprises a first balance rod mounting seat (404) sleeved outside the balance rod (4021), the balance rod (4021) is slidably connected to the first balance rod mounting seat (404), and a limiting mechanism is disposed between the balance rod (4021) and the first balance rod mounting seat (404) and used for limiting a distance of the balance rod (4021) moving towards a direction close to the lever assembly (3).

7. The electromagnetic pilot valve according to claim 6, wherein the limiting mechanism comprises a limiting step (4041) formed on the inner wall of the first balance rod mounting seat (404) and a limiting boss (40211) arranged on the outer wall of one end, close to the stroke ejector rod (4022), of the balance rod (4021), and the limiting boss (40211) is suitable for being matched and clamped with the limiting step (4041).

8. An electromagnetic pilot valve according to any one of claims 1-7, wherein the electromagnet assembly (2) comprises: the magnetic core comprises a static iron core (201) and a movable iron core (202), wherein a groove (2011) is formed in one end, close to the movable iron core (202), of the static iron core (201), and the movable iron core (202) is in sliding insertion connection with the groove (2011); at least one through air hole (2021) is formed in the movable iron core (202), and the axial direction of the air hole (2021) is parallel to the movement direction of the movable iron core (202).

9. The electromagnetic pilot valve according to claim 8, wherein a spacer (203) is arranged within the recess (2011).

10. The electromagnetic pilot valve according to claim 8, wherein one end of the movable iron core (202) away from the stationary iron core (201) is connected with a rear ejector rod (204), one end of the rear ejector rod (204) away from the movable iron core (202) is provided with an elastic resetting assembly, the elastic resetting assembly comprises a first elastic resetting element (205) and a clamping portion (2041) formed at one end of the rear ejector rod (204) away from the movable iron core (202), the first elastic resetting element (205) is sleeved on the rear ejector rod (204), one end of the first elastic resetting element (205) is abutted to the clamping portion (2041), and the other end of the first elastic resetting element (205) is abutted to the valve body (1).

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