CN113883113B - Electromagnetic valve - Google Patents

Abstract

The invention provides an electromagnetic valve, which comprises a piston and a valve core, wherein the piston is provided with an inner cavity for accommodating the valve core, the inner cavity comprises a first liquid inlet, and the valve core is movably arranged in the inner cavity; the electromagnetic valve further comprises a positioning sleeve, the positioning sleeve is provided with a first flow passage communicated with the inner cavity, the positioning sleeve is accommodated in the inner cavity and is positioned on one side, close to the first liquid inlet, of the valve core, and the valve core can be stopped. The positioning sleeve cannot be inclined relative to the piston, so that the positioning sleeve can bear repeated impact action of the valve core, deformation and even fracture caused by impact of the valve core are avoided, the stop function of the valve core is avoided, and the valve core is prevented from being separated from the piston and even falling into a hydraulic control system to cause faults; in addition, in the process of carrying out press riveting and flanging forming operation on the piston opening, the positioning sleeve cannot lead to uneven flanging press riveting due to deflection, and flanging angle errors between different positions of the piston opening can be reduced, so that the stopping effect of the flanging on the positioning sleeve is improved, and the stopping effect of the positioning sleeve on the valve core is also improved.

Description

Electromagnetic valve

Technical Field

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

Background

The electromagnetic valve is a device widely applied to a hydraulic control system and is used for controlling the on-off or flow switching of a liquid flow path in the hydraulic system. The traditional electromagnetic valve comprises a valve core, a piston and a limiting washer, wherein the limiting washer is arranged at an opening of an inner cavity of the piston and used for stopping the valve core, and then the opening of the piston is pressed and riveted to form a flanging so as to stop the limiting washer. However, when the piston and the limit washer are assembled, the limit washer is easy to deflect, is difficult to keep at a position coaxial with the inner cavity of the piston, and cannot be bent to form a flanging with the same angle in a uniform riveting manner, so that the stopping effect of the flanging on the limit washer is not ideal, and the stopping effect of the limit washer on the valve core can be influenced; in addition, the limit washer can be deformed or broken under the repeated impact of the valve core, the stop function of the valve core is lost, the valve core or the limit washer can be separated from the piston, and even the limit washer drops into a hydraulic control system, so that the electromagnetic valve fails to cause the failure of the hydraulic system.

Disclosure of Invention

In view of the above, there is a need for an improved solenoid valve.

The invention provides an electromagnetic valve, which comprises a piston and a valve core, wherein the piston is provided with an inner cavity for accommodating the valve core, the inner cavity comprises a first liquid inlet, and the valve core is movably arranged in the inner cavity; the electromagnetic valve further comprises a positioning sleeve, the positioning sleeve is provided with a first flow passage communicated with the inner cavity, the positioning sleeve is accommodated in the inner cavity and sleeved with the valve core, and the positioning sleeve is positioned on one side, close to the first liquid inlet, of the valve core and can stop the valve core.

In one embodiment, the locating sleeve is threadably connected to the piston.

So set up, threaded connection's mode can make the position sleeve set firmly in the piston more firmly, has reduced the case and has strikeed repeatedly the position sleeve, leads to case or position sleeve to take off the risk that drops from getting loose in the piston inner chamber, and the solenoid valve operation is more reliable, can use in hydraulic system for a long time, has reduced the trouble risk that the solenoid valve part dropped and causes.

In one embodiment, the positioning sleeve comprises a valve core sleeve, a valve core cavity is formed in one side, relatively close to the valve core, in the valve core sleeve, the valve core cavity is communicated with the first flow passage, and the valve core is movably arranged in the valve core cavity.

Due to the arrangement, the matching area between the valve core sleeve and the inner wall surface of the inner cavity is larger, so that the valve core sleeve and the piston have higher coaxiality, the valve core sleeve can be prevented from being inclined relative to the inner cavity of the piston, and the threaded connection between the valve core sleeve and the piston is ensured to be reliable and stable; in addition, the valve core cavity is convenient to assemble the valve core in the valve core sleeve in advance, and then the valve core and the valve core sleeve are contained in the inner cavity as a whole.

In one embodiment, the inner wall surface of the inner cavity is provided with a step surface, and the step surface can limit the depth of the positioning sleeve extending into the inner cavity.

So set up, can stretch into the degree of depth of inner chamber through the restriction position sleeve, restriction position sleeve reserves sufficient space for the case in the piston inner chamber for the position of piston to guarantee that the case can normally move about in the inner chamber, avoid because of the position sleeve too much stretches into the inner chamber, lead to the case card to hinder.

In one embodiment, the outer peripheral wall of the valve core sleeve comprises a threaded section relatively close to the first liquid inlet and a sleeve section relatively far away from the first liquid inlet, the sleeve section is matched with the inner surface of the inner cavity, and the valve core sleeve is connected with the piston through the threaded section.

So set up, the cooperation between casing section and the inner chamber has further increased the cooperation area between inner chamber and case sleeve, and the casing section has the guide effect, can be before the screw thread interlock between position sleeve periphery wall and the piston inner chamber, and the radial position of adjustment position sleeve for the piston eliminates the axiality deviation between the two, therefore can guarantee to form good reliable threaded connection between position sleeve and piston.

In one embodiment, the outer peripheral wall of the valve core sleeve is provided with a threaded section in a whole body, and the valve core sleeve is connected with the piston through the threaded section.

So set up, the cooperation between case sleeve pipe and the piston inner chamber internal surface is more reliable.

In one embodiment, a sealing port is formed in the end part, opposite to the first liquid inlet, of the piston, the sealing port is communicated with the inner cavity, and the valve core can move in the inner cavity and seal the sealing port; when the valve core seals the sealing port, the valve core part is accommodated in the valve core cavity of the valve core sleeve.

So set up, when the case moved to sealed sealing port in the inner chamber, the case periphery still can keep the cooperation with case chamber inner wall, therefore can keep parallel between case axis and its direction of motion, avoided the case to take place the skew relative case sleeve pipe to guarantee that the case can well sealed sealing port.

In one embodiment, a screwing groove is formed in the end, close to the first liquid inlet, of the positioning sleeve, and the screwing groove is used for being matched with an external tool and screwing the positioning sleeve.

So set up, outside instrument can directly stretch into the position sleeve and relatively be close to the interior chamber the first inlet the tip revolve the turn trough in, through apply the threaded connection between torque completion position sleeve and piston of screwing to outside instrument, installation operation process is more convenient.

In one embodiment, the screw groove comprises a cross-shaped counter bore or a polygonal counter bore.

By the arrangement, the shape of the screwing groove can be in closer fit with an external tool, and the part of the external tool extending into the screwing groove can be abutted and firmly attached to the inner surface of the screwing groove, so that the external tool is prevented from slipping relative to the positioning sleeve.

In one embodiment, the end of the piston relatively close to the first liquid inlet is provided with a flanging part, and the flanging part is used for stopping the positioning sleeve.

So set up, turn-ups portion can support and hold the tip that is close to first inlet relatively at the position sleeve, can play the micro-motion of restriction position sleeve along keeping away from the piston direction relatively, especially can restrict the relative slip between the external screw thread of position sleeve and the internal thread of piston inner chamber, therefore can prevent that the position sleeve from taking off from the piston inner chamber and taking off and dropping.

In one embodiment, the turn-up portion is annular.

So set up, turn-ups portion can support along the circumference of the first inlet of piston and hold and backstop position sleeve, and when the case motion and assaulted the position sleeve, the backstop power that turn-ups portion acted on the position sleeve tip was more even, therefore the backstop effect of turn-ups portion is more firm reliable.

The electromagnetic valve provided by the invention has the advantages that the positioning sleeve for sleeving the valve core is arranged in the inner cavity of the piston, so that the valve core is stopped.

The electromagnetic valve provided by the invention realizes the stop of the valve core by arranging the positioning sleeve which is accommodated in the inner cavity of the piston and sleeved with the valve core, the positioning sleeve can bear the repeated impact action of the valve core, the phenomenon that the valve core is deformed or even broken due to impact is avoided, the stop function of the valve core is lost, and the valve core is prevented from being separated from the piston and even falling into a hydraulic control system to cause faults; in addition, the locating sleeve is not prone to being inclined relative to the piston, in the process of performing press riveting and flanging forming operation on the opening of the piston, flanging press riveting unevenness cannot be caused due to the fact that the locating sleeve is inclined, flanging angle errors among different positions of the opening of the piston can be reduced, accordingly, the stopping effect of the flanging on the locating sleeve is improved, and meanwhile the stopping effect of the locating sleeve on the valve element is also improved.

Drawings

FIG. 1 is a cut-away schematic view of a solenoid valve according to an embodiment of the present invention;

FIG. 2 is a schematic view, partially in section, of the solenoid valve of FIG. 1;

FIG. 3 is a schematic view of a piston cut-away according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a boot according to an embodiment of the present invention.

100. An electromagnetic valve; 10. a piston; 101. sealing the opening; 11. an inner cavity; 111. a first liquid inlet; 1111. a first inner chamber; 1112. a second lumen; 112. a step surface; 113. a liquid storage tank; 114. a second liquid inlet; 12. flanging part; 20. a valve core; 21. an axial bore; 22. a radial bore; 30. a positioning sleeve; 31. a first flow passage; 32. a spool sleeve; 321. a spool cavity; 322. a threaded segment; 33. screwing grooves; 34. a second flow passage; 35. a bottom wall; 40. a valve body; 41. a valve cavity; 42. a first liquid inlet hole; 43. a second liquid inlet hole; 44. inserting holes; 45. a second elastic member; 50. a sleeve; 60. an electromagnetic drive assembly; 61. a clamping groove; 62. a movable iron core; 63. fixing an iron core; 64. a first elastic member; 65. sealing the steel balls; 71. a first adapter tube; 72. and a second connecting pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The electromagnetic valve is a device for controlling the flow of liquid by utilizing the principle of electromagnetic induction, and is used for controlling the flowing direction, flow speed or flow of a liquid medium. The electromagnetic valve is provided with a coil, a valve core assembly and an electromagnetic driving assembly, the coil generates a changing magnetic field through power on and power off, and the electromagnetic driving assembly is controlled to open and close the valve core assembly, so that a liquid inlet and a liquid outlet are communicated or blocked, and liquid is controlled.

The invention provides an electromagnetic valve 100 which is used for a hydraulic control system and is used for controlling the on-off or flow switching of a liquid flow path in the hydraulic control system.

Referring to fig. 1 to 2, fig. 1 is a sectional view of a solenoid valve 100 according to an embodiment of the present invention, and fig. 2 is a partial sectional view of the solenoid valve 100 shown in fig. 1; FIG. 3 is a schematic cut-away view of the piston 10 of one embodiment of the present invention; fig. 4 is a schematic cut-away view of a positioning sleeve 30 according to an embodiment of the present invention.

The solenoid valve 100 includes a valve body 40, a piston 10, and a valve spool 20. The valve body 40 is roughly in a tubular column shape, a valve cavity 41 for accommodating the piston 10 is formed in the valve body, a first liquid inlet hole 42 and a second liquid inlet hole 43 for the external connecting pipe to extend into are formed in the end part and the side part of the valve body respectively, the first liquid inlet hole 42 and the second liquid inlet hole 43 are communicated with the valve cavity 41, and the first liquid inlet hole 42 and the second liquid inlet hole 43 are used for being connected with a first connecting pipe 71 and a second connecting pipe 72 in an inserting mode respectively; in addition, the valve body 40 is further provided with an insertion hole 44 at an end portion relatively far away from the first liquid inlet hole 42, and the insertion hole 44 is used for inserting and fixing the electromagnetic driving assembly 60.

The piston 10 is cylindrical, is accommodated in the valve chamber 41 of the valve body 40, and is disposed coaxially with the valve body 40. An inner cavity 11 for accommodating the valve core 20 is coaxially formed in the piston 10, and the inner cavity 11 further comprises a first liquid inlet 111 communicated with one end of the piston 10; in addition, a liquid storage tank 113 is arranged at the end part, relatively far away from the first liquid inlet 111, of the piston 10, the liquid storage tank 113 comprises a second liquid inlet 114 and a sealing port 101 which are mutually communicated, and the sealing port 101 is communicated with the inner cavity 11 and the second liquid inlet 114; in addition, a second flow channel 34 is further formed in the side wall of the piston 10, one end of the second flow channel 34 is communicated with the liquid storage tank 113, when the piston 10 is accommodated in the valve body 40, the other end of the second flow channel 34 is communicated with the second liquid inlet hole 43, and the first liquid inlet 111 is communicated with the first liquid inlet hole 42. Therefore, the valve body 40 and the piston 10 form a flow path for liquid to pass through, when the first liquid inlet hole 42 and the second liquid inlet hole 43 of the valve body 40 are respectively inserted into the first connecting pipe 71 and the second connecting pipe 72, the liquid can enter the inner cavity 11 from the first liquid inlet hole 42 and flow out of the second liquid inlet hole 43 through the sealing opening 101, the second liquid inlet 114, the liquid storage tank 113 and the second flow channel 34, and of course, the liquid can also flow into the electromagnetic valve 100 from the second liquid inlet hole 43 in a direction opposite to the flow path and flow out of the first liquid inlet hole 42.

The valve core 20 is cylindrical and movably disposed in the inner cavity 11 of the piston 10, and is disposed coaxially with the piston 10 and the inner cavity 11. Specifically, the valve core 20 includes a conical valve tip for sealing the sealing port 101, an axial hole 21 opened therein to communicate with the first liquid inlet 111, and a radial hole 22 opened at a side of the valve core 20, the radial hole 22 communicates with the axial hole 21, and the radial hole 22 further communicates with the inner cavity 11 of the piston 10. The piston 10 can be moved by the impact of the liquid to either engage the conical valve tip with the inner wall of the sealing port 101 to seal the sealing port 101 or to actuate the valve element 20 in a direction away from the sealing port 101 to open the sealing port 101. When the valve body 20 opens the seal port 101, the inner chamber 11, the radial hole 22, the axial hole 21, and the first inlet port 111 communicate with each other.

For different types of applications, the radial holes 22 of the valve core 20 may be one or more, and the axial holes 21 may be through holes or blind holes.

The electromagnetic driving assembly 60 is fixedly connected with the valve body 40, and includes a sleeve 50, and a movable iron core 62, a fixed iron core 63, and a first elastic member 64 accommodated in the sleeve 50. Specifically, the sleeve 50 partially extends into and is screwed into the insertion hole 44 at the end of the valve body 40, and is coaxially disposed with the valve body 40, the fixed core 63 is fixedly disposed in the sleeve 50, the movable core 62 is slidably disposed in the sleeve 50, and the first elastic member 64 is disposed between the fixed core 63 and the movable core 62, and is in a compressed state, and has a resilience potential for pushing the fixed core 63 and the movable core 62. When the solenoid valve 100 is operated, a coil (not shown) is sleeved outside the solenoid valve 100, a coil ring is arranged on the periphery of the sleeve 50, and the coil generates a variable induction magnetic field by switching on and off the coil, so that variable electromagnetic force is generated between the fixed iron core 63 and the movable iron core 62, and the fixed iron core 63 attracts the movable iron core 62 to move against the elastic force of the first elastic piece 64 and to approach the fixed iron core under the action of the electromagnetic force; when the electromagnetic force disappears, the first elastic member 64 applies an elastic force to the plunger 62 to push the plunger 62 away from the stationary core 63.

Specifically, an installation channel for accommodating the first elastic member 64 is formed in the movable iron core 62, a step section for abutting against one end of the first elastic member 64 is formed in the inner wall of the installation channel, and two ends of the first elastic member 64 abut against the stage and the end of the fixed iron core 63 respectively. When the coil is electrified, the fixed iron core 63 attracts the movable iron core 62 to move against the elastic force of the first elastic piece 64 and approach the fixed iron core 63, and at the moment, the step section compresses the first elastic piece 64; when the coil is powered off and the electromagnetic force disappears, the first elastic member 64 exerts a resilient force on the step section so as to push the movable iron core 62 away from the fixed iron core 63 until the movable iron core 62 closes the second inlet port 114 of the piston 10.

In order to reduce the abrasion and impact of the movable iron core 62 on the second liquid inlet 114, the end of the movable iron core 62 relatively close to the piston 10 further comprises a sealing steel ball 65, and the sealing steel ball 65 is fixedly clamped in a clamping groove 61 formed in the end of the movable iron core 62 relatively close to the piston 10. The movable iron core 62 closes the second liquid inlet 114 through the spherical surface of the sealing steel ball 65; in order to reduce the impact on the piston 10 when the plunger 62 moves, a second elastic member 45 is further provided in the solenoid valve 100, and both ends of the second elastic member 45 are in contact with the piston 10 and the valve body 40, respectively.

The above is only the components included in one embodiment of the present invention, and the solenoid valve 100 provided by the present invention is not limited to the above components or assemblies, and other components with more functions may be selected according to the practical application and the operating condition of the solenoid valve 100.

The electromagnetic valve is a device widely applied to a hydraulic control system and is used for controlling the on-off or flow switching of a liquid flow path in the hydraulic system. The traditional electromagnetic valve comprises a valve core, a piston and a limiting washer, wherein the limiting washer is arranged at an opening of an inner cavity of the piston and used for stopping the valve core, and then the opening of the piston is pressed and riveted to form a flanging so as to stop the limiting washer. However, when the piston and the limiting washer are assembled, the limiting washer is easy to deflect and difficult to keep at a position coaxial with the inner cavity of the piston, and the limiting washer cannot be bent to form a flanging with the same angle in a uniform riveting manner, so that the stopping effect of the flanging on the limiting washer is not ideal, and the stopping effect of the limiting washer on the valve core can be influenced; in addition, the limiting washer can deform or break under the repeated impact of the valve core, the stop function of the valve core is lost, and meanwhile, the valve core or the limiting washer can be separated from the piston and even fall into a hydraulic control system, so that the electromagnetic valve fails and the hydraulic system is in failure.

In view of this, the electromagnetic valve 100 further includes a positioning sleeve 30, a first flow channel 31 communicating with the inner cavity 11 is formed in the positioning sleeve 30, the positioning sleeve 30 is accommodated in the inner cavity 11 of the piston 10 and is located on one side of the valve core 20 relatively close to the first liquid inlet 111, and the valve core 20 is sleeved and stopped at the same time.

The traditional electromagnetic valve stops the valve core through a limiting washer arranged at the piston opening, however, the limiting washer is easy to skew at the piston opening or fall off from the piston and is difficult to keep at a position coaxial with the piston inner cavity, when the limiting washer is skewed, the piston opening is difficult to ensure to be evenly pressed and riveted to form a flanging, and the stopping effect of the flanging on the limiting washer is poor; and the mounting means with spacing washer joint at the piston inner wall annular is more complicated again, and too big deformation fracture of spacing washer that leads to is hard to exert oneself very easily, sets up the annular of joint spacing washer at the piston inner wall moreover and makes piston manufacturing procedure complicated, and is difficult to the shaping, can increase the manufacturing cost of piston and solenoid valve.

In a preferred embodiment of the present invention, the outer peripheral wall of the positioning sleeve 30 is further provided with an external thread which is engaged with the inner wall surface of the inner cavity 11 of the piston 10, and is threadedly coupled with the piston 10. The inner wall surface of the positioning sleeve 30 in the inner cavity 11 and the inner wall surface of the inner cavity 11 together form a space for the valve element 20 to move.

In the electromagnetic valve 100 provided in this embodiment, the positioning sleeve 30 in threaded connection with the piston 10 is disposed in the inner cavity 11 of the piston 10 to stop the valve element 20, and the positioning sleeve 30 can be more stably and fixedly disposed in the piston 10 by the threaded connection, so that a risk that the valve element 20 or the positioning sleeve 30 falls or loosens from the inner cavity 11 of the piston 10 due to repeated impact of the valve element 20 on the positioning sleeve 30 is reduced, operation of the electromagnetic valve 100 is more reliable, and the electromagnetic valve 100 can be used in a hydraulic system for a long time, and a failure risk caused by falling of parts such as the valve element 20 of the electromagnetic valve 100 is reduced; the positioning sleeve 30 is provided with a first flow channel 31 communicated with the first liquid inlet 111, so that the normal flowing state and the flow path track of the liquid in the electromagnetic valve 100 can be ensured not to be influenced.

Please refer to fig. 2 again, and refer to fig. 4. After the positioning sleeve 30 is screwed with the piston 10, the first flow channel 31 communicates the inner cavity 11 with the first liquid inlet 111, the positioning sleeve 30 forms a bottom wall 35 at the edge of the first flow channel 31, which can be abutted against the end of the valve core 20, i.e. the inner diameter of the first flow channel 31 is smaller than the outer diameter of the valve core 20, so as to ensure that the positioning sleeve 30 can reliably stop the valve core 20, and when the valve core 20 moves in the inner cavity 11, the valve core 20 can be always kept in the inner cavity 11 of the piston 10, and the valve core 20 is prevented from falling from the inner cavity 11.

Specifically, the positioning sleeve 30 may be a disk-shaped element having a threaded portion on an outer peripheral wall, or may be a sleeve-shaped element that can extend into and match with an inner wall surface of the inner cavity 11, provided that the positioning sleeve is disposed on a side of the valve core 20 relatively close to the first liquid inlet 111, and can stop the valve core 20 from being detached from the inner cavity 11 and be screwed to the piston 10, and the specific shape of the positioning sleeve 30 is not limited.

Further, in one embodiment of the present invention, the end of the piston 10 relatively close to the first inlet port 111 is provided with a flange portion 12, the flange portion 12 is formed by bending the end of the piston 10 in the axial direction, and the flange portion 12 is used for stopping the positioning sleeve 30.

Specifically, the burring 12 of the present invention is formed by a protrusion disposed at an end of the piston 10 relatively close to the first inlet 111 under an external force. The protrusion is integrally formed with the piston 10, and an external processing device, such as a caulking machine, applies a pressing force to the protrusion, so that the protrusion is plastically deformed and bent in the axial direction of the piston 10, thereby forming the burring 12.

When the valve core 20 is accommodated in the inner cavity 11 and the positioning sleeve 30 is screwed in the inner cavity 11, the protrusion is extruded by using external processing equipment, the raised flanging part 12 can stop the positioning sleeve 30, so as to limit the micro-motion of the positioning sleeve 30 along the direction relatively far away from the piston 10, and particularly, the relative sliding between the external thread of the positioning sleeve 30 and the internal thread of the inner cavity 11 of the piston 10 can be limited, so that the positioning sleeve 30 can be kept in the inner cavity 11 of the piston 10, and the positioning sleeve can be prevented from loosening and falling off from the inner cavity of the piston.

Further, as a preferred embodiment of the present invention, the positioning sleeve 30 includes a valve core sleeve 32, and the valve core sleeve 32 has a cylindrical shape, and a shape of a longitudinal section cut along an axial direction thereof is a concave shape. A spool cavity 321 for accommodating the spool 20 is formed in one side of the spool sleeve 32, which is relatively close to the spool 20, the spool 20 and the spool sleeve 32 are coaxially arranged, the spool cavity 321 is communicated with the first flow channel 31, and the outer peripheral wall of the spool 20 is in clearance fit with the inner peripheral wall of the spool cavity 321, so that the outer peripheral wall of the spool 20 is movable relative to the inner peripheral wall of the spool cavity 321. The spool sleeve 32 passes through the bottom wall 35 at the edge of the first flow passage 31, and stops against the end of the spool 20. The valve element 20 is thus movable between the bottom wall 35 of the valve element sleeve 32 and the sealing port 101 of the inner chamber 11 relatively far from the first inlet port 111.

With such an arrangement, the solenoid valve 100 can be assembled more conveniently, the valve core 20 can be accommodated in the valve core sleeve 32, and then the valve core 20 and the valve core sleeve 32 can be put into the inner cavity 11 of the piston 10 as a whole; in addition, the matching area between the valve core sleeve 32 and the inner wall surface of the inner cavity 11 is larger, so that the valve core sleeve 32 and the piston 10 have higher coaxiality, the valve core sleeve 32 can be prevented from being inclined relative to the inner cavity 11 of the piston 10, and the threaded connection between the valve core sleeve 32 and the inner cavity 11 is ensured to be reliable and stable.

Further, in one embodiment, the inner wall surface of the inner cavity 11 is provided with a step surface 112, and the positioning sleeve 30 enters the inner cavity 11 from the first liquid inlet 111 until the end of the positioning sleeve 30 relatively far away from the first flow passage 31 abuts against the step surface 112, so that the step surface 112 can limit the depth of the positioning sleeve 30 extending into the inner cavity 11.

Specifically, the inner chamber 11 includes a first inner chamber 1111 relatively close to the first inlet port 111 and a second inner chamber 1112 relatively far from the first inlet port 111, the first inner chamber 1111 has an inner diameter larger than that of the second inner chamber 1112, and the cross-sectional shape of the piston 10 taken along the axial direction of the piston 10 is substantially convex.

When the step surface 112 stops the end of the positioning sleeve 30 relatively far away from the first flow passage 31, the distance between the sealing port 101 of the piston 10 and the inner wall surface of the end of the positioning sleeve 30 relatively far away from the first flow passage 31 is greater than the length of the valve core 20, so as to ensure that the valve core 20 can move axially relative to the piston 10 in the inner cavity 11.

So set up, can be through the degree of depth that the restriction position sleeve 30 stretched into inner chamber 11, restriction position sleeve 30 is for the position of piston 10, reserves sufficient space for case 20 in piston 10 inner chamber 11 to guarantee that case 20 can normally move about in inner chamber 11, avoid because of position sleeve 30 too much stretches into inner chamber 11, lead to case 20 jamming.

Further, the outer peripheral wall of the valve core sleeve 32 includes a threaded section 322 relatively close to the first liquid inlet 111, and a sleeve section relatively far from the first liquid inlet 111, the sleeve section is matched with the inner surface of the inner cavity 11, and the valve core sleeve 32 is connected with the piston 10 through the threaded section 322.

Specifically, in this embodiment, the maximum outer diameter of the threaded section 322 is greater than the outer diameter of the casing section, with a step formed between the threaded section 322 and the casing section. In order to facilitate the insertion of the valve core sleeve 32 into the cavity 11, a transition fit or a clearance fit is provided between the sleeve section and the inner wall of the cavity 11. During the process of installing the valve core sleeve 32 into the inner cavity 11 of the piston 10, the sleeve segment is firstly matched with the inner wall of the second inner cavity 1112, and then the threaded section 322 is matched with the internal thread of the inner wall of the inner cavity 11 until the step between the threaded section 322 and the sleeve segment is abutted against the step surface 112 of the inner cavity 11.

So set up, the cooperation between sleeve section and the inner chamber 11 has further increased the cooperation area between inner chamber 11 and case sleeve 32, and the sleeve section has the guide effect, can be before the screw occlusion between the outer peripheral wall of position sleeve 30 and piston 10 inner chamber 11, adjusts the radial position of position sleeve 30 for piston 10, eliminates the axiality deviation between the two, therefore can guarantee to form good reliable threaded connection between position sleeve 30 and piston 10.

Alternatively, in another embodiment, the outer peripheral wall of the valve core sleeve 32 is provided with a threaded section 322 in a whole body, and the valve core sleeve 32 is connected with the piston 10 through the threaded section 322. So configured, the fit between the spool sleeve 32 and the inner surface of the cavity 11 of the piston 10 is more reliable.

Further, the spool sleeve 32 is sized for the following applications: when the valve core 20 moves in the inner cavity 11 of the piston 10 or in the valve core cavity 321, the valve core sleeve 32 can always accommodate the valve core 20, and when the valve core 20 moves in a direction relatively close to the sealing port 101 and seals the sealing port 101, a portion of the valve core 20 relatively close to the first liquid inlet 111 is still accommodated in the valve core cavity 321, that is, a side wall of the valve core 20 can always contact with an inner wall surface of the valve core cavity 321.

With such an arrangement, when the valve core 20 moves in the inner cavity 11 to seal the sealing port 101, the outer periphery of the valve core 20 can still keep fit with the inner wall of the valve core cavity 321, so that the axis of the valve core 20 can keep parallel to the moving direction thereof, and the valve core 20 is prevented from deflecting relative to the valve core sleeve 32, thereby ensuring that the valve core 20 can well seal the sealing port 101.

Further, in one embodiment, the end of the positioning sleeve 30 opposite to the first liquid inlet 111 of the inner cavity 11 is opened with a screw groove 33, and the screw groove 33 is used for cooperating with an external tool and screwing the positioning sleeve 30.

In the present embodiment, the screw groove 33 is a blind groove opened at an end of the positioning sleeve 30 relatively close to the first liquid inlet 111, and an external tool can extend into and abut against an inner wall of the screw groove 33, so as to apply a torque to the external tool, thereby driving the positioning sleeve 30 to rotate relative to the piston 10 until the positioning sleeve 30 and the piston 10 are screwed tightly.

The portion of the external tool extending into the screw groove 33 can be abutted and firmly attached to the inner surface of the screw groove 33, so as to prevent the external tool from slipping off relative to the positioning sleeve 30. Specifically, the screw groove 33 includes a cross-shaped counter groove or a polygonal counter bore.

The electromagnetic valve 100 provided by the invention realizes the stop of the valve core 20 by arranging the positioning sleeve 30 which is accommodated in the inner cavity 11 of the piston 10 and sleeved with the valve core 20, the positioning sleeve 30 can bear the repeated impact action of the valve core 20, the phenomenon that the valve core 20 is deformed or even broken due to impact is avoided, so that the stop function of the valve core 20 is lost, and the valve core 20 is prevented from being separated from the piston 10 and even falling into a hydraulic control system to cause faults; in addition, the locating sleeve 30 is not prone to being skewed relative to the piston 10, in the process of performing press riveting and flanging forming operation on the opening of the piston 10, flanging press riveting unevenness cannot be caused due to the fact that the locating sleeve 30 is skewed, and flanging angle errors among different positions of the opening of the piston 10 can be reduced, so that the stopping effect of flanging on the locating sleeve 30 is improved, and meanwhile the stopping effect of the locating sleeve 30 on the valve element 20 is also improved.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims (9)

1. A solenoid valve comprises a piston (10) and a valve core (20), wherein the piston (10) is provided with an inner cavity (11) for accommodating the valve core (20), the inner cavity (11) comprises a first liquid inlet (111), and the valve core (20) is movably arranged in the inner cavity (11); the electromagnetic valve is characterized by further comprising a positioning sleeve (30), wherein the positioning sleeve (30) is provided with a first flow channel (31) communicated with the inner cavity (11), the positioning sleeve (30) is accommodated in the inner cavity (11) and sleeved with the valve core (20), and the positioning sleeve (30) is positioned on one side, close to the first liquid inlet (111), of the valve core (20) and can stop the valve core (20);

the positioning sleeve (30) comprises a valve core sleeve (32), a valve core cavity (321) is formed in one side, close to the valve core (20), of the valve core sleeve (32), and the valve core (20) is movably arranged in the valve core cavity (321); a sealing opening (101) is formed in the end, relatively far away from the first liquid inlet (111), of the piston (10), and the sealing opening (101) is communicated with the inner cavity (11);

the valve core (20) can move in the inner cavity (11) and seals the sealing port (101); when the valve core (20) seals the sealing port (101), part of the valve core (20) is accommodated in the valve core cavity (321) and keeps matching with the inner wall of the valve core cavity (321);

the end, close to the inner cavity (11), of the positioning sleeve (30) of the first liquid inlet (111) is provided with a screwing groove (33), and the screwing groove (33) is used for being matched with an external tool and screwing the positioning sleeve (30).

2. The solenoid valve according to claim 1, characterized in that said positioning sleeve (30) is screwed to said piston (10).

3. The solenoid valve according to claim 2, characterized in that the spool chamber (321) communicates with the first flow channel (31).

4. The electromagnetic valve according to claim 3, characterized in that the inner wall surface of the inner cavity (11) is provided with a step surface (112), and the step surface (112) can limit the depth of the positioning sleeve (30) extending into the inner cavity (11).

5. The solenoid valve according to claim 4, characterized in that the peripheral wall of the spool sleeve (32) comprises a threaded section (322) relatively close to the first inlet port (111) and a sleeve section relatively far from the first inlet port (111), the sleeve section cooperating with the inner surface of the inner chamber (11), the spool sleeve (32) being connected to the piston (10) by the threaded section (322).

6. The electromagnetic valve according to claim 3 or 4, characterized in that the outer peripheral wall of the spool sleeve (32) is provided with a threaded section (322) throughout, and the spool sleeve (32) is connected with the piston (10) through the threaded section (322).

7. Solenoid valve according to claim 1, characterized in that said screwing slot (33) comprises a cross-shaped counter-sunk slot or a polygonal counter-sunk hole.

8. The solenoid valve according to any one of claims 1 to 5 or 7, characterised in that the end of the piston (10) relatively close to the first inlet orifice (111) is provided with a flanging (12), the flanging (12) being intended to stop the positioning sleeve (30).

9. A solenoid valve according to claim 8, characterised in that the flanging portion (12) is annular.

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