CN117231795A - Electromagnetic driving mechanism and electromagnetic valve - Google Patents

Abstract

The invention belongs to the technical field of electromagnetic driving, and discloses an electromagnetic driving mechanism and an electromagnetic valve. The electromagnetic driving mechanism comprises a fixed iron, a magnetic conduction pipe, a coil and a movable iron, wherein the fixed iron is connected with the magnetic conduction pipe, a push rod is movably arranged in the fixed iron, one end of the push rod extends into the magnetic conduction pipe, a magnetism isolating ring is arranged at one end, close to the fixed iron, of the magnetic conduction pipe, and a magnetic conduction ring is arranged at the inner side of the magnetism isolating ring and is not in contact with the magnetic conduction pipe. The coil is arranged on the outer sides of the fixed iron and the magnetic conduction pipe, the movable iron is movably arranged in the magnetic conduction pipe and connected with the push rod, and the movable iron can be attracted with the fixed iron under the action of a magnetic field of the coil or can move to be staggered with the magnetic conduction ring in a direction away from the fixed iron. The electromagnetic driving mechanism can simultaneously improve the electromagnetic force when the air gap between the moving iron and the fixed iron is larger and the air gap is smaller.

Description

Electromagnetic driving mechanism and electromagnetic valve

Technical Field

The invention relates to the technical field of electromagnetic driving, in particular to an electromagnetic driving mechanism and an electromagnetic valve.

Background

The electromagnetic valve drives the valve core to move through the electromagnetic driving mechanism so as to open or close the oil port on the main valve sleeve, thereby achieving the purpose of controlling the reversing of the hydraulic oil way.

The electromagnetic driving mechanism comprises a moving iron, a fixed iron, a magnetic conduction pipe and a coil, wherein the fixed iron is connected with the main valve sleeve, the moving iron is movably arranged in the magnetic conduction pipe, and the coil is sleeved outside the fixed iron and the magnetic conduction pipe. The magnetic field generated by the coil passes through the main valve sleeve, the fixed iron and the movable iron to form a closed loop at the gap between the movable iron and the fixed iron, and the magnetic field makes the movable iron and the fixed iron attract each other, so that the valve core in the main valve sleeve is pushed to move. The electromagnetic force generated by the magnetic field decreases as the air gap between the moving iron and the fixed iron increases.

In the prior art, a basin opening is usually arranged on a magnetic conduction pipe, a magnetic field is divided into two parts by arranging the basin opening, one part of magnetic induction wires is turned to reach the moving iron through the basin opening, and the other part of magnetic induction wires reach the moving iron through an air gap. When the air gap is larger, the magnetic flux passing through the basin mouth maintains a certain electromagnetic force, so that the effective stroke of the electromagnetic valve is increased. However, when the air gap is small, the magnetic flux passing through the air gap is a leakage flux, so that the electromagnetic force is weaker when the air gap is small than in the form without the tub mouth.

Accordingly, there is a need for improvements in electromagnetic drive mechanisms and solenoid valves to address the above issues.

Disclosure of Invention

A first object of the present invention is to provide an electromagnetic driving mechanism capable of simultaneously improving electromagnetic force when an air gap between a moving iron and a fixed iron is large and the air gap is small.

To achieve the purpose, the invention adopts the following technical scheme:

an electromagnetic drive mechanism comprising:

the magnetic conduction device comprises a fixed iron and a magnetic conduction pipe, wherein the fixed iron is connected with the magnetic conduction pipe, a push rod is movably arranged in the fixed iron, one end of the push rod extends into the magnetic conduction pipe, a magnetism isolating ring is arranged at one end, close to the fixed iron, of the magnetic conduction pipe, a magnetism isolating ring is arranged at the inner side of the magnetism isolating ring, and the magnetism isolating ring is not in contact with the magnetic conduction pipe;

the coil is arranged outside the fixed iron and the magnetic conduction pipe;

the moving iron is movably arranged in the magnetic conduction pipe and connected with the push rod, and can be attracted with the fixed iron under the action of the magnetic field of the coil or move to the direction far away from the fixed iron to be staggered with the magnetic conduction ring.

Alternatively, the width of the magnetism isolating ring gradually increases from the inner diameter side to the outer diameter side of the magnetism isolating ring.

Alternatively, the width of the magnetic conductive ring gradually decreases from the inner diameter side to the outer diameter side of the magnetic conductive ring.

Alternatively, the cross section of the magnetic conducting ring is triangular or trapezoidal.

Alternatively, the magnetic ring and the magnetic tube are made of the same material.

As an alternative, the magnetic ring and the magnetic tube are in an integrated structure, and the magnetism isolating ring is welded to the magnetic ring and the magnetic tube.

Alternatively, the moving iron divides the magnetic conduction pipe into two oil cavities, and the two oil cavities are communicated.

As an alternative, the moving iron is provided with a through hole, and the through hole penetrates through the moving iron along the axial direction of the moving iron.

As an alternative, a plurality of through grooves are formed in the outer side face of the moving iron along the axial direction of the moving iron, and the through grooves penetrate through the moving iron.

A second object of the present invention is to provide a solenoid valve that increases the travel of the spool.

To achieve the purpose, the invention adopts the following technical scheme:

the electromagnetic valve comprises a main valve sleeve and a valve core, wherein the valve core is movably arranged in the main valve sleeve, a plurality of oil ports are formed in the main valve sleeve, the valve core can move in the main valve sleeve to open or close the oil ports, and the electromagnetic valve further comprises an electromagnetic driving mechanism as described above, and the electromagnetic driving mechanism is used for driving the valve core to act.

As an alternative, the main valve sleeve is connected to the fixed iron, and one end of the push rod, which is away from the movable iron, is connected to the valve core.

As an alternative scheme, the one end that the case links to each other with the push rod is provided with first boss, the cover is equipped with the elastic component on the case, the one end of elastic component support in first boss, be provided with the second boss on the inner wall of main valve barrel, the other end of elastic component support in the second boss, when the coil loses the electricity, the elastic component can pass through the case with the push rod promotes move the iron to keeping away from the direction of deciding the iron.

The beneficial effects are that:

according to the electromagnetic driving mechanism provided by the invention, when the air gap between the moving iron and the fixed iron is small, the magnetic induction wire enters the moving iron through the basin mouth, the magnetic conduction ring is separated, the magnetic induction wire does not pass through the magnetic conduction ring or the magnetic induction wire passing through the magnetic conduction ring is extremely small, and serious magnetic leakage is avoided, so that the electromagnetic force in a stroke with a small air gap is ensured. When the air gap between the moving iron and the fixed iron is larger, the magnetic conduction is enhanced through the magnetic conduction ring, so that the magnetic induction line passing through the moving iron is increased, the electromagnetic force when the air gap is large is improved, the moving iron can have a larger stroke and can have a larger electromagnetic force at a larger stroke, and the moving iron can reach a larger stroke range. In the technical field of electromagnetic valves, the small step of adding a magnetic conduction valve is unprecedented and has unexpected technical effects.

According to the electromagnetic valve provided by the invention, the electromagnetic driving mechanism is arranged, so that the moving stroke of the valve core driven by the passive iron is increased, and the adjustment range of the oil port is further increased.

Drawings

FIG. 1 is a cross-sectional view of a solenoid valve provided by an embodiment of the invention;

FIG. 2 is a state diagram of the moving iron and fixed iron with smaller gap provided by the embodiment of the invention;

FIG. 3 is an enlarged block diagram of FIG. 2 at A;

FIG. 4 is a state diagram of the moving iron and fixed iron with a larger gap provided by the embodiment of the invention;

fig. 5 is an enlarged structural view at B in fig. 4.

In the figure:

1. iron fixing; 2. a magnetic conduction tube; 3. a push rod; 4. a magnetism isolating ring; 5. a magnetic conductive ring; 6. a coil; 7. a moving iron; 71. a through hole; 8. a main valve sleeve; 81. an oil port; 82. a second boss; 9. a valve core; 91. a first boss; 10. an elastic member; 11. a seal ring; 12. a screw plug; 13. and (5) locking the nut.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, the embodiment provides a solenoid valve, which comprises a main valve sleeve 8 and a valve core 9, wherein the valve core 9 is movably arranged in the main valve sleeve 8, a plurality of oil ports 81 are arranged on the main valve sleeve 8, and the valve core 9 can move in the main valve sleeve 8 to open or close the oil ports 81, so as to achieve the purpose of controlling the reversing of a hydraulic oil circuit.

In order to drive the valve core 9 to reciprocate in the main valve sleeve 8, the electromagnetic valve further comprises an electromagnetic driving mechanism, and the electromagnetic driving mechanism is used for driving the valve core 9 to act.

Specifically, as shown in fig. 1, the electromagnetic driving mechanism includes a fixed iron 1, a magnetic conductive tube 2, a coil 6 and a moving iron 7, wherein the fixed iron 1 and the magnetic conductive tube 2 are connected, and specifically, the fixed iron 1 and the magnetic conductive tube 2 can be made of the same material and formed into an integral structure by casting. The main valve sleeve 8 is connected to the stator 1 by means of screw connection or clamping connection. A sealing ring 11 is clamped between the main valve sleeve 8 and the fixed iron 1 to improve the tightness between the main valve sleeve 8 and the fixed iron 1 and prevent hydraulic oil leakage.

The fixed iron 1 is movably provided with a push rod 3, one end of the push rod 3 extends into the magnetic conduction pipe 2 to be connected with the movable iron 7, and one end of the push rod 3 deviating from the movable iron 7 is connected with the valve core 9. The coil 6 is arranged on the outer sides of the fixed iron 1 and the magnetic conduction pipe 2, the movable iron 7 is movably arranged in the magnetic conduction pipe 2, and the movable iron 7 can be attracted with the fixed iron 1 or move in a direction away from the fixed iron 1 under the action of a magnetic field of the coil 6, so that the valve core 9 is driven to reciprocate left and right.

In order to enable the moving iron 7 to automatically move leftwards for resetting when the coil 6 is powered off, an elastic piece 10 is arranged between the valve core 9 and the main valve sleeve 8, and after the coil 6 is powered off, the valve core 9 moves leftwards under the elastic force of the elastic piece 10 and pushes the moving iron 7 to move leftwards through the push rod 3 so as to be separated from the fixed iron 1. Specifically, one end of the valve core 9 connected with the push rod 3 is provided with a first boss 91, the valve core 9 is sleeved with an elastic piece 10, one end of the elastic piece 10 abuts against the first boss 91, the inner wall of the main valve sleeve 8 is provided with a second boss 82, the other end of the elastic piece 10 abuts against the second boss 82, and when the coil 6 is powered off, the elastic piece 10 can push the movable iron 7 to move in a direction far away from the fixed iron 1 through the valve core 9 and the push rod 3. The elastic member 10 may employ a compression spring.

The moving iron 7 divides the magnetic conduction pipe 2 into two oil cavities, and the two oil cavities are communicated in order to prevent the pressure holding phenomenon when the stopping iron 7 acts. As shown in fig. 1, the moving iron 7 is provided with a through hole 71, and the through hole 71 penetrates through the moving iron 7 along the axial direction of the moving iron 7 so as to be communicated with oil cavities at two ends of the moving iron 7, thereby achieving the purpose of preventing the stopping iron 7 from being pressed in the process of moving left and right.

In other embodiments, the communication between the two ends of the moving iron 7 may be achieved by other manners, for example, a plurality of through grooves are provided on the outer side surface of the moving iron 7 along the axial direction of the moving iron 7, and the through grooves penetrate through the moving iron 7, so that a through hole structure can be formed between the moving iron 7 and the magnetic conductive tube 2. Preferably, a plurality of through grooves are uniformly arranged at intervals, and in general, the pressure relief requirement can be met by arranging six through grooves uniformly arranged at intervals.

Optionally, referring to fig. 1, a plug screw 12 is disposed at an end of the magnetic tube 2 far away from the stator 1, the plug screw 12 is plugged into the magnetic tube 2 and is fixed by a lock nut 13, and meanwhile, an end face of the lock nut 13 abuts against the coil 6 to fix the coil 6.

The magnetic field generated by the coil 6 passes through the main valve sleeve 8, the fixed iron 1 and the movable iron 7 to form a closed loop at the air gap between the movable iron 7 and the fixed iron 1, and the magnetic field makes the movable iron 7 and the fixed iron 1 attract each other, so that the valve core 9 in the main valve sleeve 8 is pushed to move. The electromagnetic force generated by the magnetic field decreases as the air gap between the moving iron 7 and the fixed iron 1 increases.

In order to solve the above problems, as shown in fig. 1 and 2, a magnetism isolating ring 4 is disposed at one end of the magnetic conductive pipe 2 near the fixed iron 1, and the magnetism isolating ring 4 can be made of copper or other non-magnetic conductive materials. The magnetism isolating ring 4 is non-magnetic, a basin opening is formed on the magnetism conducting tube 2, the basin opening divides the magnetic field into two parts, one part of magnetism induction wires is turned to reach the moving iron 7 through the basin opening, and the other part of magnetism induction wires reach the moving iron 7 through an air gap. When the air gap is larger, the magnetic flux passing through the basin mouth maintains a certain electromagnetic force, so that the effective stroke of the electromagnetic valve is increased. However, when the air gap is small, the magnetic flux passing through the air gap is a leakage flux, so that the electromagnetic force is weaker when the air gap is small than in the form without the tub mouth.

The electromagnetic force is inversely proportional to the square of the size of the air gap, the electromagnetic force is small when the air gap is large, and the electromagnetic force is large when the air gap is small, so that the prior art cannot well consider the electromagnetic force and the air gap. If a larger effective stroke is desired (i.e., a certain electromagnetic force is obtained at a given air gap), the pattern of the basin opening can only be extended, but this can weaken the electromagnetic force in a stroke where the air gap is small.

In order to solve the above problems, this embodiment proposes an improvement scheme, as shown in fig. 2 and 3, a magnetic conducting ring 5 is disposed on the inner side of the magnetic isolation ring 4, and the magnetic conducting ring 5 is not in contact with the magnetic conducting tube 2, that is, the magnetic conducting ring 5 is disposed in the magnetic isolation ring 4 and separated from the magnetic conducting tube 2 by the magnetic isolation ring 4, and in the process of moving the moving iron 7 left and right, the magnetic conducting ring 5 can be staggered, so that the magnetic induction line can enter the moving iron 7 through the magnetic conducting ring 5.

As shown in fig. 2 and 3, when the air gap between the moving iron 7 and the fixed iron 1 is small, the minimum distance L1 between the magnetic conductive ring 5 and the basin mouth is larger than the minimum distance L2 between the moving iron 7 and the basin mouth, the magnetic conductive ring 5 is separated, the magnetic induction line enters the moving iron 7 through the basin mouth, and the magnetic induction line does not pass through the magnetic conductive ring 5 or passes through the magnetic conductive ring 5, so that the magnetic induction line is extremely small, and the serious magnetic leakage is avoided, thereby ensuring the electromagnetic force in the stroke with small air gap.

As shown in fig. 4 and 5, when the air gap between the moving iron 7 and the fixed iron 1 is larger, the minimum distance L1 between the magnetic conducting ring 5 and the basin mouth is smaller than the minimum distance L2 between the moving iron 7 and the basin mouth, the magnetic conducting ring 5 is exposed, the magnetic conduction is enhanced through the magnetic conducting ring 5, and the magnetic induction line passing through the moving iron 7 is increased, so that the electromagnetic force in the large air gap is improved. Thereby enabling the moving iron 7 to have a larger stroke and to have a larger electromagnetic force at the larger stroke. In the technical field of electromagnetic valves, the small step of adding a magnetic conduction valve is unprecedented and has unexpected technical effects.

Specifically, as shown in fig. 4 and 5, the width of the magnetism isolating ring 4 gradually increases from the inner diameter side to the outer diameter side of the magnetism isolating ring 4, so that the section of the magnetism isolating ring 4 becomes an inverted ladder, a basin opening is formed to incline, an alpha included angle is formed between the basin opening and the axis of the moving iron 7, the alpha included angle can be set to be 30-60 degrees, and the magnetism induction line is more beneficial to steering through the basin opening inclined plane and entering the moving iron 7.

Further, as shown in fig. 4 and 5, the magnetic conductive ring 5 is disposed on the side of the magnetism isolating ring 4 close to the fixed iron 1. The width of the magnetic conduction ring 5 is gradually reduced from the inner diameter side to the outer diameter side of the magnetic conduction ring 5, and the magnetic conduction ring 5 has a larger opening towards the moving iron 7, so that the magnetic induction line is more beneficial to entering and exiting the magnetic conduction ring 5. Preferably, the cross section of the magnetic ring 5 is triangular, so as to facilitate processing. Of course, the shape of the magnetic conductive ring 5 is not limited to this, and the magnetic conductive ring 5 may be provided in a trapezoid, rectangle, square or the like in cross section, and may function to increase magnetic conduction.

Optionally, the magnetic conduction ring 5 and the magnetic conduction pipe 2 are made of the same material, the magnetic conduction ring 5 and the magnetic conduction pipe 2 are processed into an integrated structure through casting, the magnetism isolating ring 4 is welded on the magnetic conduction ring 5 and the magnetic conduction pipe 2, and processing is convenient.

During processing, the magnetic conduction pipe 2 is firstly processed into a solid structure, and is cast and molded together with the fixed iron 1, a welding groove is reserved at the position of the magnetism isolating ring 4 during casting, and the magnetic conduction ring 5 is synchronously cast. After casting, the magnetism isolating ring 4 is welded in the reserved welding groove, and then the groove in the center of the magnetic conduction pipe 2 is machined.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (12)

1. An electromagnetic drive mechanism, comprising:

the magnetic conduction device comprises a fixed iron (1) and a magnetic conduction pipe (2), wherein the fixed iron (1) is connected with the magnetic conduction pipe (2), a push rod (3) is movably arranged in the fixed iron (1), one end of the push rod (3) extends into the magnetic conduction pipe (2), a magnetism isolating ring (4) is arranged at one end, close to the fixed iron (1), of the magnetic conduction pipe (2), a magnetism isolating ring (5) is arranged at the inner side of the magnetism isolating ring (4), and the magnetism isolating ring (5) is not contacted with the magnetic conduction pipe (2);

a coil (6) arranged outside the fixed iron (1) and the magnetic conduction pipe (2);

the moving iron (7) is movably arranged in the magnetic conduction pipe (2) and is connected with the push rod (3), and the moving iron (7) can be attracted with the fixed iron (1) under the action of a magnetic field of the coil (6) or move to be staggered with the magnetic conduction ring (5) in a direction away from the fixed iron (1).

2. The electromagnetic drive mechanism as recited in claim 1, characterized in that the width of the magnetism isolating ring (4) gradually increases from an inner diameter side to an outer diameter side of the magnetism isolating ring (4).

3. The electromagnetic drive mechanism according to claim 1, wherein the width of the magnetically permeable ring (5) gradually decreases from an inner diameter side to an outer diameter side of the magnetically permeable ring (5).

4. An electromagnetic drive according to claim 3, characterized in that the magnetically permeable ring (5) is triangular or trapezoidal in cross-section.

5. The electromagnetic drive mechanism according to claim 1, wherein the magnetically permeable ring (5) and the magnetically permeable tube (2) are made of the same material.

6. The electromagnetic drive mechanism as recited in claim 5, wherein the magnetically permeable ring (5) is of unitary construction with the magnetically permeable tube (2), and the magnetically permeable ring (4) is welded to the magnetically permeable ring (5) and the magnetically permeable tube (2).

7. Electromagnetic drive mechanism according to any one of claims 1-6, characterized in that the moving iron (7) divides the magnetic tube (2) into two oil chambers, between which two oil chambers are in communication.

8. Electromagnetic drive mechanism according to claim 7, characterized in that the moving iron (7) is provided with a through hole (71), which through hole (71) penetrates the moving iron (7) in the axial direction of the moving iron (7).

9. The electromagnetic drive mechanism according to claim 7, characterized in that a plurality of through slots are provided on the outer side surface of the moving iron (7) in the axial direction of the moving iron (7), the through slots penetrating the moving iron (7).

10. The electromagnetic valve comprises a main valve sleeve (8) and a valve core (9), wherein the valve core (9) is movably arranged in the main valve sleeve (8), a plurality of oil ports (81) are formed in the main valve sleeve (8), and the valve core (9) can move in the main valve sleeve (8) to open or close the oil ports (81), and the electromagnetic valve is characterized by further comprising an electromagnetic driving mechanism according to any one of claims 1-9, and the electromagnetic driving mechanism is used for driving the valve core (9) to act.

11. The electromagnetic valve according to claim 10, characterized in that the main valve sleeve (8) is connected to the fixed iron (1), and the end of the push rod (3) facing away from the moving iron (7) is connected to the valve core (9).

12. The electromagnetic valve according to claim 10, characterized in that a first boss (91) is arranged at one end of the valve core (9) connected with the push rod (3), an elastic piece (10) is sleeved on the valve core (9), one end of the elastic piece (10) is propped against the first boss (91), a second boss (82) is arranged on the inner wall of the main valve sleeve (8), the other end of the elastic piece (10) is propped against the second boss (82), and when the coil (6) is in power failure, the elastic piece (10) can push the moving iron (7) to move in a direction away from the fixed iron (1) through the valve core (9) and the push rod (3).