CN116576292A - Electromagnetic pilot valve - Google Patents

Abstract

The invention discloses an electromagnetic pilot valve, wherein a valve core string is arranged in a valve core sleeve, the valve core sleeve is arranged on a valve body, the valve core string comprises a first balance seat, a second balance seat, a middle position valve seat and a spring sleeve, which are sequentially arranged from left to right, balance rods are arranged in the first balance seat and the second balance seat in a penetrating manner, a stroke ejector rod is arranged in the middle position valve seat in a penetrating manner, and a spring rod is arranged in the spring sleeve in a penetrating manner. The electromagnetic assembly drives the lever to move so as to drive the valve core to move in series, the spring sleeve is in sealing connection with the middle valve seat by adopting a sealing ceramic ball, and the middle valve seat is in abutting sealing with the second balance seat by adopting two metal planes; the metal plane abutting seal is convenient for controlling the sealing contact area, and the overlarge contact stress is avoided; the contact force between the spring sleeve and the middle position valve seat is small, and the sealing ceramic ball is arranged between the spring sleeve and the middle position valve seat, so that the contact stress is moderate while the sealing performance is effectively ensured, the overlarge contact stress is avoided, the structural abrasion can be effectively reduced, and the service life is prolonged.

Description

Electromagnetic pilot valve

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic pilot valve.

Background

The emulsion pump station is a power source of the hydraulic support and provides hydraulic power for supporting force, pushing, pulling and other actions for the hydraulic support. In the prior art, the pump stations are all designed by adopting reciprocating plunger type, and the reciprocating plunger pump is a constant delivery pump and cannot be matched with the actual demand flow of the bracket. In order to solve the matching of the actual demand flow and the pump station output flow, at present, all the domestic and foreign emulsion pump stations adopt an unloading valve to adjust and match the flow output by the pump station to a working face, and an electromagnetic pilot valve is a component for controlling the work of the unloading valve.

In the prior art, a lever of the electromagnetic pilot valve generally adopts a screw adjusting mode, the screw is easy to loosen, the contact area of an adjusting screw and a ceramic ball is small, and the electromagnetic pilot valve is easy to wear and deform, so that the electromagnetic valve is invalid; the valve core string is sealed by adopting a ceramic ball and a metal seat, the sealing band between the metal seat and the ceramic ball is narrower, the contact stress of the sealing surface is overlarge, and the sealing surface fails after multiple cycles; the stroke rod is in point contact with the sealing ball, the stroke rod is easy to wear during the action, the stroke rod is shortened, and the electromagnetic pilot valve cannot realize a preset stroke to fail; thereby affecting the service life of the electromagnetic pilot valve.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the service life of the valve body is reduced after the contact surfaces of all parts of the electromagnetic pilot valve in the prior art are worn, so as to provide the electromagnetic pilot valve.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the invention proposes an electromagnetic pilot valve comprising: the valve comprises an electromagnetic assembly, a valve body, a valve core string and a lever; a valve core cavity and a conducting cavity communicated with one end of the valve core cavity are arranged in the valve body, and a valve core sleeve penetrates through the other end of the valve core cavity and is fixed on the valve body; the valve core string comprises a first balance seat, a second balance seat, a middle position valve seat and a spring sleeve which are sequentially arranged in the valve core sleeve from left to right, wherein balance rods are arranged in the first balance seat and the second balance seat in a penetrating manner, a travel ejector rod is arranged in the middle position valve seat in a penetrating manner, a spring rod is arranged in the spring sleeve in a penetrating manner, a sealing ceramic ball is arranged between the spring sleeve and the middle position valve seat, the spring rod is connected with the travel ejector rod through the sealing ceramic ball, and the left end plane of the travel ejector rod is in butt joint with the right end plane of the balance rod; the lever is arranged in the conducting cavity, one end of the lever is connected with the electromagnetic assembly, and the other end of the lever is connected with the balance rod through the outer ejector rod.

According to some embodiments of the invention, a circular arc groove is formed in one side, close to the valve core string, of the lever, a contact rod is arranged in the circular arc groove, and the lever is connected with the outer ejector rod through the contact rod.

According to some embodiments of the invention, a first cavity is formed between the left end of the balance rod and the first balance seat, a second cavity is formed between the right end of the balance rod and the second balance seat, a third cavity is formed between the stroke push rod and the middle valve seat, and a fourth cavity is formed between the sealing ceramic ball and the spring sleeve;

a first hydraulic cavity communicated with the first cavity is formed between the first balance seat and the valve core sleeve, a second hydraulic cavity communicated with the second cavity is formed between the second balance seat and the valve core sleeve, a third hydraulic cavity communicated with the third cavity is formed between the middle-position valve seat and the valve core sleeve, and a fourth hydraulic cavity communicated with the fourth cavity is formed between the spring sleeve and the valve core sleeve;

the valve core sleeve is sequentially provided with a first through hole, a second through hole, a third through hole and a fourth through hole which are formed in the radial direction from left to right;

the valve body is provided with a first hydraulic port, a second hydraulic port and a third hydraulic port, the first hydraulic port is communicated with the first hydraulic cavity and the fourth hydraulic cavity through the first through hole and the fourth through hole respectively, the second hydraulic port is communicated with the second hydraulic cavity through the second through hole, and the third hydraulic port is communicated with the third hydraulic cavity through the third through hole.

According to some embodiments of the invention, the middle position valve seat is provided with a middle through hole along the axis, the stroke ejector rod is arranged on the middle through hole in a penetrating way, the middle part of the middle position valve seat is provided with a plurality of radial holes along the circumferential direction, and the radial holes are communicated with the middle through hole.

According to some embodiments of the invention, an annular groove coaxially arranged with the central through hole is formed in the middle of the middle position valve seat, the annular groove is formed in the circumferential direction of the central through hole, and the radial hole is communicated with the central through hole through the annular groove.

According to some embodiments of the invention, the two side end surfaces of the median valve seat are provided with dirt holding grooves.

According to some embodiments of the invention, the stroke ejector rod is cylindrical, a spiral groove is formed in the periphery of the stroke ejector rod, and the spiral groove is communicated with the annular groove.

According to some embodiments of the invention, the electromagnetic assembly comprises: the device comprises a shell, a push rod, an armature, a yoke and an electromagnetic coil, wherein the shell is provided with a first mounting groove and a second mounting groove; the ejector rod is arranged on the shell in a penetrating way, and one end of the ejector rod is connected with the lever; the armature iron is fixedly sleeved on the ejector rod, the armature iron part is installed in the first installation groove, and one end of the armature iron, which is positioned outside the first installation groove, is arranged in a multi-stage ladder manner so as to increase electromagnetic force; the yoke is sleeved on the ejector rod and is enclosed with the second mounting groove to form a mounting cavity, and an air gap cavity is enclosed between the yoke and the armature; the electromagnetic coil is arranged in the installation cavity, and an electromagnetic field is formed after the electromagnetic coil is electrified so as to drive the armature to slide in the air gap cavity along the axial direction, so that the ejector rod is pushed to move.

According to some embodiments of the invention, the armature includes an associated body portion that is mounted within the first mounting slot and an end portion that extends out of the first mounting slot, the end part at least comprises a first step section, a second step section and a third step section, the diameters of the first step section, the second step section and the third step section are sequentially increased, the diameter of the second step section is smaller than the outer diameter of the first mounting groove, and the diameter of the third step section is larger than the outer diameter of the first mounting groove.

According to some embodiments of the invention, the electromagnetic assembly further comprises a spacer piece that is sleeved on the ejector rod, the spacer piece being positioned between the armature and the yoke to reduce the suction force in the air gap chamber.

The technical scheme of the invention has the following advantages:

1. the invention provides an electromagnetic pilot valve, wherein a valve core string is arranged in a valve core sleeve, the valve core sleeve is arranged on a valve body, the valve core string comprises a first balance seat, a second balance seat, a middle position valve seat and a spring sleeve, which are sequentially arranged from left to right, a balance rod is arranged in the first balance seat and the second balance seat in a penetrating manner, a stroke ejector rod is arranged in the middle position valve seat in a penetrating manner, a spring rod is arranged in the spring sleeve in a penetrating manner, a first arc concave surface is arranged at the left end of the spring rod, a second arc concave surface is arranged at the right end of the stroke ejector rod, the spring rod is connected with the stroke ejector rod through a sealing ceramic ball, and the plane of the left end of the stroke ejector rod is abutted against the plane of the right end of the balance rod; one end of the lever is connected with the electromagnetic assembly, and the valve core string is connected with the other end of the lever through the outer ejector rod. The electromagnetic assembly drives the lever to move so as to drive the valve core to move in series, the spring sleeve is in sealing connection with the middle valve seat by adopting a sealing ceramic ball, and the middle valve seat is in abutting sealing with the second balance seat by adopting two metal planes; the metal plane abutting seal can conveniently control the sealing contact area, and the problems that the contact surface is too large to seal or the contact area is too small, the contact stress is too large and the cycle life is low are avoided; the contact force between the spring sleeve and the middle position valve seat is small, and the sealing ceramic ball is arranged between the spring sleeve and the middle position valve seat, so that the contact stress is moderate while the sealing performance is effectively ensured, the overlarge contact stress is avoided, the structural abrasion can be effectively reduced, and the service life is prolonged.

2. According to the electromagnetic pilot valve provided by the invention, the contact rod is arranged between the outer ejector rod and the lever, so that the abrasion loss of the outer ejector rod is reduced, the contact rod is easy to replace, the cost is low, and the maintenance is facilitated.

3. The electromagnetic pilot valve provided by the invention can take the first hydraulic port as a pressure port, the second hydraulic port as a control function port and the third hydraulic port as a pressure relief port; the first hydraulic port can be blocked, the second hydraulic port is used as a pressure port, and the third hydraulic port is used as a pressure relief port; the electromagnetic pilot valve has multiple application paths and improves the universality.

4. According to the electromagnetic pilot valve provided by the invention, as the internal hole of the electromagnetic pilot valve is smaller, the valve port opening stroke is smaller, the electromagnetic pilot valve is sensitive to pollutants, the sealing surface is possibly invalid when the pollutants enter the sealing surface, the two end surfaces of the middle position valve seat are provided with the pollutant containing grooves, and the pollutants can be stored in the pollutant containing grooves when fluid flows, so that the service life of the pilot valve is prolonged.

5. According to the electromagnetic pilot valve provided by the invention, the spiral groove is formed in the periphery of the stroke ejector rod, so that high-pressure liquid can flow between the stroke ejector rod and the middle position valve seat from the radial hole, and the stroke ejector rod can be prevented from being clamped in the middle position valve seat.

6. According to the electromagnetic pilot valve provided by the invention, the annular groove which is coaxially arranged with the middle through hole is formed in the middle of the middle valve seat, the annular groove is formed along the circumferential direction of the middle through hole, and the radial hole is communicated with the middle through hole through the annular groove, so that the storage space of high-pressure liquid is increased, and the high-pressure liquid can conveniently enter between the middle valve seat and the stroke ejector rod.

7. According to the electromagnetic pilot valve provided by the invention, one end of the armature is arranged in the multi-end step mode, so that the output force of the electromagnet is increased, and the smoothness of the output force is ensured.

8. According to the electromagnetic pilot valve provided by the invention, the separation piece is arranged between the armature and the yoke, so that the attractive force between the armature and the yoke is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of an electromagnetic pilot valve provided in some embodiments of the invention;

FIG. 2 is a cross-sectional view of a valve body provided in some embodiments of the invention;

FIG. 3 is a cross-sectional view of an electromagnetic assembly provided in some embodiments of the invention;

fig. 4 is a schematic structural view of an armature provided in some embodiments of the invention;

FIG. 5 is a schematic view of a median valve seat according to some embodiments of the invention

Fig. 6 is a graph comparing the armature output electromagnetic force provided by the present invention with the armature output electromagnetic force of the prior art;

reference numerals illustrate: 1. an electromagnetic assembly; 2. a valve body; 3. a lever; 4. a valve core sleeve; 5. a valve core string; 11. a housing; 12. a push rod; 13. an armature; 14. a yoke; 15. an electromagnetic coil; 16. a spacer; 21. a first hydraulic port; 22. a second hydraulic port; 23. a third hydraulic port; 31. a contact bar; 41. a first through hole; 42. a second through hole; 43. a third through hole; 44. a fourth through hole; 51. a first balance seat; 52. a second balance base; 53. a median valve seat; 54. a spring sleeve; 55. an outer ejector rod; 56. a balance bar; 57. a stroke ejector rod; 58. sealing the ceramic balls; 59. a spring rod; 131. a main body portion; 132. an end portion; 531. a middle through hole; 532. annular grooving; 533. a radial hole; 534. a sewage containing groove.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured 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 should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between 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 addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Referring to fig. 1 to 6, an electromagnetic pilot valve includes: the electromagnetic assembly 1, the valve body 2, the valve core string 5 and the lever 3; a valve core cavity and a conducting cavity communicated with one end of the valve core cavity are arranged in the valve body 2, and a valve core sleeve 4 is penetrated from the other end of the valve core cavity and fixed on the valve body 2; the valve core string 5 comprises a first balance seat 51, a second balance seat 52, a middle position valve seat 53 and a spring sleeve 54 which are sequentially arranged in the valve core sleeve 4 from left to right, a balance rod 56 is arranged in the first balance seat 51 and the second balance seat 52 in a penetrating manner, a stroke ejector rod 57 is arranged in the middle position valve seat 53 in a penetrating manner, a spring rod 59 is arranged in the spring sleeve 54 in a penetrating manner, a sealing ceramic ball 58 is arranged between the spring sleeve 54 and the middle position valve seat 53, the spring rod 59 and the stroke ejector rod 57 are connected through the sealing ceramic ball 58, a lever 3 is arranged in a conducting cavity, one end of the lever 3 is connected with the electromagnetic assembly 1, and the other end of the lever 3 is connected with the balance rod 56 through an outer ejector rod 55.

Specifically, a first arc concave surface is disposed at the left end of the spring rod 59, a second arc concave surface is disposed at the right end of the stroke push rod 57, the spring rod 59 is connected with the stroke push rod 57 through a sealing ceramic ball 58, and the plane of the left end of the stroke push rod 57 is abutted against the plane of the right end of the balance rod 56.

The electromagnetic valve is used on the pump station unloading valve, when the pressure of the hydraulic system is increased, pump outlet liquid is required to be unloaded into the hydraulic water tank, when the pressure of the hydraulic system is insufficient, pump outlet liquid is required to be loaded into the hydraulic system, and when the electromagnetic pilot valve is powered on, the electromagnetic pilot valve is loaded and unloaded in a power-off way; thus, the power on and off of the electromagnetic assembly 1 is a critical parameter. The electromagnetic force generated by the electromagnetic assembly 1 needs to be larger than the sum of the hydraulic force and the spring force, so that when the electromagnetic force generated by the electromagnetic assembly 1 works, larger contact stress is easy to generate between contact surfaces of all the components, and the service life is influenced.

Referring to fig. 2, the electromagnetic pilot valve provided by the invention is characterized in that a valve core string 5 is arranged in a valve core sleeve 4, the valve core sleeve 4 is arranged on a valve body 2, the valve core string 5 comprises a first balance seat 51, a second balance seat 52, a middle position valve seat 53 and a spring sleeve 54 which are sequentially arranged from left to right, a balance rod 56 is penetrated in the first balance seat 51 and the second balance seat 52, a stroke ejector rod 57 is penetrated in the middle position valve seat 53, a spring rod 59 is penetrated in the spring sleeve 54, a first circular arc concave surface is arranged at the left end of the spring rod 59, a second circular arc concave surface is arranged at the right end of the stroke ejector rod 57, the spring rod 59 is connected with the stroke ejector rod 57 through a sealing ceramic ball 58, and the plane of the left end of the stroke ejector rod 57 is abutted against the plane of the right end of the balance rod 56; one end of the lever 3 is connected with the electromagnetic assembly 1, and the valve core string 5 is connected with the other end of the lever 3 through the outer ejector rod 55. The electromagnetic assembly 1 drives the lever 3 to move so as to drive the valve core string 5 to move, the spring sleeve 54 is in sealing connection with the middle valve seat 53 by adopting a sealing ceramic ball 58, and the middle valve seat 53 is in abutting sealing with the second balance seat 52 by adopting two metal planes; the metal plane abutting seal can conveniently control the sealing contact area, and the problems that the contact surface is too large to seal or the contact area is too small, the contact stress is too large and the cycle life is low are avoided; because the contact force between the spring sleeve 54 and the middle position valve seat 53 is small, the sealing ceramic ball 58 is arranged between the spring sleeve 54 and the middle position valve seat 53, so that the contact stress is moderate while the sealing performance is effectively ensured, the overlarge contact stress is avoided, the structural abrasion can be effectively reduced, and the service life is prolonged.

It can be appreciated that the second balancing seat 52 is provided with a through hole along the axis, and the diameter of the through hole is larger than that of the middle through hole 531 of the middle valve seat 53, so that the balancing rod 56 and the middle valve seat 53 can be abutted, the middle valve seat 53 and the second balancing seat 52 form a limit, and the excessive stroke of the balancing rod 56 and the abrasion and sealing are avoided.

In some embodiments of the present invention, a circular arc groove is formed on one side of the lever 3 near the valve core string 5, a contact rod 31 is arranged in the circular arc groove, and the lever 3 is connected with the outer ejector rod 55 through the contact rod 31.

Specifically, the outer ejector rod 55 is connected with the lever 3 through the contact rod 31, and in the assembling process, the contact rod 31 can be installed in the circular arc groove in a matched mode by grinding the contact rod, and the outer ejector rod 55 and the lever 3 can be directly and stably connected through the contact rod 31. Since the contact between the lever 3 and the outer push rod 55 is frequent, the contact surface of the lever 3 or the outer push rod 55 may be worn by long-time work, thereby increasing maintenance cost. The contact rod 31 is used for connecting the outer ejector rod 55 and the lever 3, so that the abrasion loss of the outer ejector rod 55 is reduced, the contact rod 31 is easy to replace, the cost is low, and the maintenance is facilitated.

In some embodiments of the present invention, a first cavity is formed between the left end of the balance bar 56 and the first balance seat 51, a second cavity is formed between the right end of the balance bar 56 and the second balance seat 52, a third cavity is formed between the stroke push rod 57 and the middle valve seat 53, and a fourth cavity is formed between the sealing ceramic ball 58 and the spring sleeve 54;

a first hydraulic cavity communicated with the first cavity is formed between the first balance seat 51 and the valve core sleeve 4, a second hydraulic cavity communicated with the second cavity is formed between the second balance seat 52 and the valve core sleeve 4, a third hydraulic cavity communicated with the third cavity is formed between the middle position valve seat 53 and the valve core sleeve 4, and a fourth hydraulic cavity communicated with the fourth cavity is formed between the spring sleeve 54 and the valve core sleeve 4;

the valve core sleeve 4 is provided with a first through hole 41, a second through hole 42, a third through hole 43 and a fourth through hole 44 which are formed in the radial direction from left to right in sequence;

the valve body 2 is provided with a first hydraulic port 21, a second hydraulic port 22 and a third hydraulic port 23, the first hydraulic port 21 is communicated with the first hydraulic cavity and the fourth hydraulic cavity through a first through hole 41 and a fourth through hole 44 respectively, the second hydraulic port 22 is communicated with the second hydraulic cavity through a second through hole 42, and the third hydraulic port 23 is communicated with the third hydraulic cavity through a third through hole 43.

Referring to fig. 2, specifically, when the first hydraulic port 21 is used as a pressure port, when the electromagnetic assembly 1 is powered off, high-pressure liquid enters the first cavity from the first through hole 41 and the first hydraulic cavity, enters the fourth cavity from the fourth through hole 44 and the fourth hydraulic cavity, hydraulic pressure to the right is formed by the high-pressure liquid in the first cavity to the balance rod 56, the balance sense is abutted with the stroke ejector rod 57, the hydraulic pressure is transferred to the sealing ceramic ball 58 through the stroke ejector rod 57, hydraulic pressure to the left is formed by the high-pressure liquid in the fourth cavity to the sealing ceramic ball 58, in addition, the sealing ceramic ball 58 is subjected to elastic force in the left direction, after the three forces are overlapped, the sealing ceramic ball 58 is subjected to resultant force in the left direction, and the resultant force is transferred to the middle-position valve seat 53 to form a seal, the first hydraulic port 21 and the second hydraulic port 22 are not communicated with each other, and the second hydraulic port 22 and the third hydraulic port 23 are communicated with each other; when the electromagnetic assembly 1 is powered on, electromagnetic force is amplified by the lever 3 and is transmitted to the balance rod 56 through the outer ejector rod 55, at this time, because hydraulic force in the first cavity and hydraulic force in the fourth cavity are mutually offset, electromagnetic force can push the sealing ceramic ball 58 away and push the balance rod 56 to the middle valve seat 53, at this time, the balance rod 56 receives rightward electromagnetic force, rightward hydraulic force is formed in the first cavity, leftward hydraulic force formed in the fourth cavity and leftward elastic force transmitted by the spring rod 59 are transmitted to the stroke ejector rod 57, the ejector rod 12 is formed to abut against the balance rod 56, the balance rod 56 receives rightward electromagnetic force, rightward hydraulic force formed in the first cavity, leftward hydraulic force formed in the fourth cavity and leftward elastic force in the direction are overlapped, and after the four forces are overlapped, the balance rod 56 receives rightward resultant force and transmits the resultant force to the middle valve seat 53 to form a seal, at this time, the first hydraulic port 21 and the second hydraulic port 22 are communicated, and the second hydraulic port 22 and the third hydraulic port 23 are not communicated with each other.

In some embodiments of the invention, the electromagnetic pilot valve may be connected in use with a first hydraulic port 21 to a system high pressure port of the direct acting valve, a second hydraulic port 22 to a control port of the direct acting valve, and a third hydraulic port 23 to a low pressure port of the direct acting valve. When the electromagnetic assembly 1 is not powered, the first hydraulic port 21 is not communicated with any interface, and the second hydraulic port 22 is communicated with the third hydraulic port 23; after the electromagnet is powered on, the first hydraulic port 21 and the second hydraulic port 22 are communicated with each other, and the third hydraulic port 23 is not communicated with any interface. The second hydraulic port 22 may also be connected to the system high pressure port of the direct acting valve, the third hydraulic port 23 may be connected to the low pressure port or the control port, and the first hydraulic port 21 may be closed during use.

That is, when the first hydraulic port 21 is a pressure port, the second hydraulic port 22 is a control function port, and the thirdThe hydraulic port 23 is a pressure relief port, and when the first hydraulic port 21 is plugged, the second hydraulic port 22 is a pressure port, and the third hydraulic port 23 is a pressure relief port. In both methods, the third hydraulic port 23 is used as a pressure relief port, because the hydraulic pressure of the pressure port is larger, the pressure of the pressure relief port is close to 0, high-pressure liquid is sprayed to the pressure relief port at the moment, the largest throttling position of the electromagnetic pilot valve is a third cavity formed between the middle valve seat 53 and the stroke push rod 57, the flow rate of the high-pressure liquid in the third cavity is large, and the flow rate of the high-pressure liquid is controlled according to Bernoulli's equationNegative pressure is formed at the joint of the middle valve seat 53, the stroke push rod 57 and the sealing ceramic ball 58, air is separated out from high-pressure liquid and annihilates, rapid cavitation is caused at the moment, and the cavitation-caused part is in a honeycomb hole shape, so that abrasion and damage are increased.

In some embodiments of the present invention, a throttle plug is installed at the third hydraulic port 23, and the throttle effect of the throttle plug is to maintain the pressure at the front end of the throttle plug at a positive pressure, so as to avoid the liquid pressure at the junction of the median valve seat 53, the stroke plunger 57 and the sealing ceramic ball 58 from decreasing below the saturated vapor pressure (5430 Pa), thereby generating cavitation.

Referring to fig. 5, in some embodiments of the present invention, a central through hole 531 is formed in the middle valve seat 53 along the axis, the stroke plunger 57 is disposed on the central through hole 531, a plurality of radial holes 533 are formed in the middle of the middle valve seat 53 along the circumferential direction, and the radial holes 533 are communicated with the central through hole 531.

Specifically, the high-pressure liquid in the third cavity is introduced into the middle through hole 531 through the radial hole 533, and is led to both sides from the middle through hole 531, so as to prevent the stroke plunger 57 from being blocked in the middle valve seat 53.

In some embodiments of the present invention, the middle part of the median valve seat 53 is provided with an annular slot 532 coaxially disposed with the middle through hole 531, the annular slot 532 is circumferentially disposed along the middle through hole 531, and the radial hole 533 is communicated with the middle through hole 531 through the annular slot 532.

Specifically, the annular slot 532 provides a temporary space for the flow of high-pressure liquid, which is convenient for the high-pressure liquid to flow to both sides, and avoids the stamping of the stroke ejector 57 by the high-pressure liquid.

Referring to fig. 5, in some embodiments of the present invention, dirt-receiving grooves 534 are formed on both side end surfaces of the median valve seat 53.

Specifically, because the internal hole of the electromagnetic pilot valve is smaller, the opening stroke of the valve port is smaller, the electromagnetic pilot valve is sensitive to pollutants, and when the pollutants enter the sealing surface, the sealing surface may be invalid, the two end surfaces of the middle position valve seat 53 are provided with the pollutant containing grooves 534, and the pollutants can be stored in the pollutant containing grooves 534 when the fluid flows, so that the service life of the pilot valve is prolonged.

In some embodiments of the present invention, the stroke rod 57 has a cylindrical shape, and the outer circumference of the stroke rod 57 is provided with a spiral groove, which communicates with the annular groove 532. It will be appreciated that high pressure fluid may flow to both sides through the helical grooves, avoiding the travel post 57 from seizing up in the median valve seat 53.

Referring to fig. 3, in some embodiments of the invention, an electromagnetic assembly 1 comprises: the device comprises a shell 11, a push rod 12, an armature 13, a yoke 14 and an electromagnetic coil 15, wherein the shell 11 is provided with a first mounting groove and a second mounting groove; the ejector rod 12 is arranged on the shell 11 in a penetrating way, and one end of the ejector rod 12 is connected with the lever 3; the armature 13 is fixedly sleeved on the ejector rod 12, part of the armature 13 is installed in the first installation groove, and one end of the armature 13, which is positioned outside the first installation groove, is arranged in a multi-stage step mode so as to increase electromagnetic force; the yoke 14 is sleeved on the ejector rod 12 and is enclosed with the second mounting groove to form a mounting cavity, and an air gap cavity is enclosed between the yoke 14 and the armature 13; the electromagnetic coil 15 is arranged and installed in the cavity, and an electromagnetic field is formed after the electromagnetic coil 15 is electrified so as to drive the armature 13 to slide in the air gap cavity along the axial direction, so that the ejector rod 12 is pushed to move.

Specifically, in order to make the output force of the electromagnetic assembly 1 gentle in the range of travel, and add electromagnetic force in limited space, the armature 13 inside the electromagnetic assembly 1 adopts multistage ladder arrangement, the yoke 14 is concave step design, the yoke 14 and the armature 13 are all sleeved on the ejector rod 12, an air gap cavity is formed between the yoke 14 and the armature 13, after the electromagnetic coil 15 is electrified, the electromagnetic coil 15 forms an electromagnetic field, a magnetic field is formed in the air gap cavity, the armature 13 is fixedly connected with the ejector rod 12, the armature 13 is influenced by magnetic attraction force in the air gap cavity, slides along the axial direction, and further pushes the ejector rod 12 to move.

It will be appreciated that a junction box is provided on one side of the housing 11, the junction box being electrically connected to the energising coil to provide power to the energising coil. A first sliding bearing is provided between the housing 11 and the jack 12, and a second sliding bearing is provided between the yoke 14 and the jack 12 to facilitate sliding of the jack 12 in the axial direction. An O-ring is provided between the yoke 14 and the ram 12 to prevent water vapor from entering the interior of the solenoid assembly 1.

According to the electromagnetic assembly 1, through the penetrating transmission of the ejector rod 12, the armature 13 is prevented from being blocked due to installation errors.

Referring to fig. 4, in some embodiments of the present invention, the armature 13 includes a body portion 131 and an end portion 132 connected to each other, the end portion 132 including at least a first step, a second step, and a third step having sequentially increasing diameters, the second step having a diameter smaller than an outer diameter of the first mounting groove, and the third step having a diameter larger than the outer diameter of the first mounting groove.

Specifically, the main body 131 is disposed in the first mounting groove, the end 132 extends out of the first mounting groove, and the end 132 is at least three steps, including a first step with a sequentially increasing diameter, a second step and a third step, and after the third step is designed, electromagnetic force can be increased in a limited space, and the output force of the electromagnet can be increased in multiple steps by adopting the first step and the second step, so that the output force is relatively gentle. If the first, second and third steps are eliminated, the armature 13 is processed into a straight cylinder shape, when the armature 13 enters the primary stage of the groove of the yoke 14, the electromagnetic force is larger, the electromagnetic force gradually becomes smaller as the armature 13 enters the yoke 14, and the electromagnetic force rapidly increases as the distance between the end plane of the yoke 14 and the end plane of the armature 13 is reduced, as shown in the curve trend of fig. 6 a; with the yoke 14 of the present invention, the force output characteristics are shown in fig. 6b, and under the same conditions, the output force of the electromagnet of the present invention is more gentle and larger.

In some embodiments of the present invention, the electromagnetic assembly 1 further includes a spacer 16, the spacer 16 is sleeved on the ejector rod 12, and the spacer 16 is located between the armature 13 and the yoke 14 to reduce the attractive force in the air gap chamber.

Specifically, by providing the spacer 16 between the armature 13 and the yoke 14, the attractive force between the armature 13 and the yoke 14 is reduced.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (10)

1. An electromagnetic pilot valve, comprising:

an electromagnetic assembly (1);

the valve comprises a valve body (2), wherein a valve core cavity and a conducting cavity communicated with one end of the valve core cavity are arranged in the valve body (2), and a valve core sleeve (4) is penetrated from the other end of the valve core cavity and fixed on the valve body (2);

the valve core string (5), the valve core string (5) comprises a first balance seat (51), a second balance seat (52), a middle position valve seat (53) and a spring sleeve (54) which are sequentially arranged in the valve core sleeve (4) from left to right, a balance rod (56) is arranged in the first balance seat (51) and the second balance seat (52) in a penetrating mode, a travel ejector rod (57) is arranged in the middle position valve seat (53) in a penetrating mode, a spring rod (59) is arranged in the spring sleeve (54) in a penetrating mode, a sealing ceramic ball (58) is arranged between the spring sleeve (54) and the middle position valve seat (53), the spring rod (59) is connected with the travel ejector rod (57) through the sealing ceramic ball (58), and the left end plane of the travel ejector rod (57) is in butt joint with the right end plane of the balance rod (56);

the lever (3), lever (3) set up in the conduction intracavity, the one end of lever (3) with electromagnetic assembly (1) is connected, the other end of lever (3) pass through outer ejector pin (55) with balancing pole (56).

2. The electromagnetic pilot valve according to claim 1, characterized in that a circular arc groove is arranged on one side of the lever (3) close to the valve core string (5), a contact rod (31) is arranged in the circular arc groove, and the lever (3) is connected with the outer ejector rod (55) through the contact rod (31).

3. The electromagnetic pilot valve according to claim 1, characterized in that a first cavity is formed between the left end of the balance rod (56) and the first balance seat (51), a second cavity is formed between the right end of the balance rod (56) and the second balance seat (52), a third cavity is formed between the stroke push rod (57) and the middle valve seat (53), and a fourth cavity is formed between the sealing ceramic ball (58) and the spring sleeve (54);

a first hydraulic cavity communicated with the first cavity is formed between the first balance seat (51) and the valve core sleeve (4), a second hydraulic cavity communicated with the second cavity is formed between the second balance seat (52) and the valve core sleeve (4), a third hydraulic cavity communicated with the third cavity is formed between the middle position valve seat (53) and the valve core sleeve (4), and a fourth hydraulic cavity communicated with the fourth cavity is formed between the spring sleeve (54) and the valve core sleeve (4);

the valve core sleeve (4) is sequentially provided with a first through hole (41), a second through hole (42), a third through hole (43) and a fourth through hole (44) which are formed in the radial direction from left to right;

be equipped with first hydraulic pressure mouth (21), second hydraulic pressure mouth (22) and third hydraulic pressure mouth (23) on valve body (2), first hydraulic pressure mouth (21) are respectively through first through-hole (41) with fourth through-hole (44) with first hydraulic pressure chamber with fourth hydraulic pressure chamber intercommunication, second hydraulic pressure mouth (22) are through second through-hole (42) with second hydraulic pressure chamber intercommunication, third hydraulic pressure mouth (23) are through third through-hole (43) with third hydraulic pressure chamber intercommunication.

4. An electromagnetic pilot valve according to any one of claims 1 to 3, characterized in that the middle valve seat (53) is provided with a middle through hole (531) along the axial direction, the stroke push rod (57) is arranged on the middle through hole (531) in a penetrating way, the middle part of the middle valve seat (53) is provided with a plurality of radial holes (533) along the circumferential direction, and the radial holes (533) are communicated with the middle through hole (531).

5. The electromagnetic pilot valve according to claim 4, characterized in that an annular groove (532) coaxially arranged with the central through hole (531) is provided in the middle of the median valve seat (53), the annular groove (532) is provided along the circumferential direction of the central through hole (531), and the radial hole (533) is communicated with the central through hole (531) through the annular groove (532).

6. The electromagnetic pilot valve according to claim 5, characterized in that the two side end surfaces of the middle position valve seat (53) are provided with dirt containing grooves (534).

7. The electromagnetic pilot valve according to claim 5, characterized in that the stroke push rod (57) is cylindrical, a spiral groove is formed in the periphery of the stroke push rod (57), and the spiral groove is communicated with the annular groove (532).

8. An electromagnetic pilot valve according to claim 1, characterized in that the electromagnetic assembly (1) comprises:

a housing (11), wherein the housing (11) is provided with a first mounting groove and a second mounting groove;

the ejector rod (12) is arranged on the shell (11) in a penetrating mode, and one end of the ejector rod (12) is connected with the lever (3);

the armature iron (13) is fixedly sleeved on the ejector rod (12), the armature iron (13) is partially installed in the first installation groove, and one end of the armature iron (13) positioned outside the first installation groove is arranged in a multi-stage step mode so as to increase electromagnetic force;

the yoke (14) is sleeved on the ejector rod (12) and is enclosed with the second mounting groove to form a mounting cavity, and an air gap cavity is enclosed between the yoke (14) and the armature (13);

the electromagnetic coil (15) is arranged in the installation cavity, and an electromagnetic field is formed after the electromagnetic coil (15) is electrified so as to drive the armature (13) to slide in the air gap cavity along the axial direction, so that the ejector rod (12) is pushed to move.

9. The electromagnetic pilot valve according to claim 8, characterized in that the armature (13) comprises a connected main body portion (131) and an end portion (132), the main body portion (131) is mounted in the first mounting groove, the end portion (132) extends out of the first mounting groove, the end portion (132) comprises at least a first step, a second step and a third step with sequentially increasing diameters, the diameter of the second step is smaller than the outer diameter of the first mounting groove, and the diameter of the third step is larger than the outer diameter of the first mounting groove.

10. The electromagnetic pilot valve according to claim 9, characterized in that the electromagnetic assembly (1) further comprises a spacer (16), the spacer (16) being sleeved on the ejector rod (12), the spacer (16) being located between the armature (13) and the yoke (14) to reduce the suction force in the air gap chamber.