CN218294651U - Normally closed proportional electromagnetic valve - Google Patents

Abstract

The utility model provides a normal close formula proportional solenoid valve belongs to the technical field of solenoid valve. The utility model discloses a connect valve body and disk seat, slide the case and set up in valve body and disk seat, and simultaneously, the regulation hole has been seted up on the disk seat, and set up adjusting screw in the regulation hole, and be provided with the spring between adjusting screw and the case, twist through adjusting screw moves and to realize the regulation of the prestressing force size of spring to the case, satisfy the long-time user demand who uses back spring when leading to spring force to reduce because of fatigue to adjust adjusting screw and adjust the spring force, and simultaneously, the hole of inlaying on the slide opening on the valve body and the disk seat is the cylinder hole, and the aperture of slide opening and inlaying all is more than or equal to the diameter of case, adjusting screw's diameter is greater than the diameter of spring, it directly takes out the change to make things convenient for at follow-up spring, easily decrease the structure such as case appears damaging after, need not to change wholly, the cost of overhaul has been reduced, do benefit to the use and the popularization of normal close formula proportion solenoid valve.

Description

Normally closed proportional electromagnetic valve

Technical Field

The utility model relates to a technical field of solenoid valve specifically relates to a normal close formula proportional solenoid valve.

Background

A proportional electromagnetic valve is arranged on an oil supply pipeline of a fuel engine of an automobile, and the flow of fuel oil in the pipeline is controlled through the proportional electromagnetic valve, so that the control of the fuel engine is realized, and the application is very wide.

At present, the proportional solenoid valves already applied in the market are mainly divided into normally open type and normally closed type, the fuel oil channel of the normally open proportional solenoid valve is in a conducting state in an initial state and is closed after being electrified, and the fuel oil channel of the normally closed proportional solenoid valve is in a closed state in the initial state and is opened after being electrified. The existing normally closed proportional solenoid valve comprises a valve seat, a valve body, a valve core, an armature, a connecting rod, a spring and an electromagnetic assembly, the valve body is connected with the valve seat, the valve core is slidably arranged in the valve body, the armature is slidably arranged in the valve seat and is abutted tightly through the spring, the electromagnetic assembly is arranged outside the valve seat and corresponds to the armature, the armature is connected with the valve core through the connecting rod, in an initial state, the valve core separates an oil inlet and an oil outlet on the valve body, and under the condition that the electromagnetic assembly is electrified, the armature drives the valve core to move in the valve body through the connecting rod, the communication of the oil inlet and the oil outlet is realized, and the flow size is adjusted. Although the structure can meet the requirements of normally closed and flow regulation, in the actual use process, the easily damaged structural parts such as springs are easy to fatigue under the long-time use condition, so that the problems of elasticity reduction or damage and the like are caused, the use performance of the proportional solenoid valve is influenced, the cost for integrally replacing the proportional solenoid valve is high, and therefore, the proportional solenoid valve which can realize regulation and is easy to replace the structural parts is necessary.

Disclosure of Invention

To the above-mentioned problem that exists among the prior art, it aims at providing a normal close formula proportional solenoid valve now, with a regulation hole has been seted up in the bottom of valve body, be provided with adjusting screw in the regulation hole, withstand the spring through adjusting screw, in addition, adjusting screw's diameter is greater than the diameter of spring, and simultaneously, the aperture of the slide on the valve body is greater than the diameter of case and armature, made things convenient for the spring, the direct change of taking out of wearing parts such as armature and case, can satisfy the user demand of adjustable elasticity after spring force reduces, can make things convenient for the change of wearing part again, the problem of the high cost that proportional solenoid valve whole change brought has been avoided, do benefit to the wide use of normal close formula proportional solenoid valve.

The specific technical scheme is as follows:

the normally closed proportional solenoid valve includes valve body, valve seat, valve core, spring and solenoid assembly, and also includes one regulating screw,

the valve body is provided with sliding holes penetrating through two ends, one end of each sliding hole is an oil inlet, and the side wall of one end of the valve body, which is provided with the oil inlet, is provided with a plurality of oil outlets communicated with the sliding holes;

one end of the valve seat is provided with an embedding hole and is connected with one end of the valve body, which is far away from the oil inlet, and the other end of the valve seat is provided with an adjusting hole communicated with the embedding hole;

the valve core is arranged in the sliding hole in a sliding mode, one end of the valve core extends into the embedded hole, the oil outlet is closed at one end of the valve core in an initial state, the oil outlet is opened at one end of the valve core when the valve core slides, the sliding hole and the embedded hole are cylindrical holes, and the hole diameters of the sliding hole and the embedded hole are larger than or equal to the diameter of the valve core;

the spring is arranged in the adjusting hole, and one end of the spring abuts against one end of the valve core extending into the embedding hole;

the adjusting screw is in threaded connection with the adjusting hole and abuts against the other end of the spring, and the diameter of the adjusting screw is larger than that of the spring;

the electromagnetic assembly is sleeved outside the valve seat and is positioned at the joint of the valve seat and the valve body.

The normally closed proportional solenoid valve comprises a valve core, wherein the valve core comprises an armature, the armature is of a columnar structure, one end of the armature extends into the embedded hole, the other end of the armature extends to the oil inlet, one end of the armature, which extends to the oil inlet, is arranged in a variable cross section manner, and a step formed at the variable cross section covers the oil outlet in an initial state.

The normally closed proportional solenoid valve further comprises a valve sleeve, wherein the valve sleeve is fixedly sleeved in the sliding hole, the valve sleeve is slidably sleeved outside the armature, two ends of the valve sleeve extend to two sides of the oil outlet respectively, a plurality of oil passing holes are formed in the valve sleeve, and the oil passing holes correspond to the oil outlets one to one.

The normally closed type proportional electromagnetic valve further comprises a limiting ring, a through hole is formed in the limiting ring in a penetrating mode, the limiting ring is connected in the oil inlet in a threaded mode, and in an initial state, one end, opened or closed by the valve core, of the oil outlet abuts against the limiting ring.

The normally closed proportional solenoid valve is characterized in that the electromagnetic assembly is arranged in a barrel shape, the valve seat is arranged in the inner cavity of the barrel of the electromagnetic assembly, and the barrel opening of the electromagnetic assembly covers the joint of the valve seat and the valve body.

The normally closed proportional solenoid valve is characterized in that a connecting sleeve is arranged between the valve body and the valve seat, the connecting sleeve is sleeved outside the valve body and the valve seat and located at the connecting position of the valve body and the valve seat, and meanwhile, two ends of the connecting sleeve are respectively connected with the valve body and the valve seat in a welding mode.

The normally closed type proportional electromagnetic valve further comprises a shell, and the shell is arranged outside the electromagnetic assembly and the valve body.

The normally closed proportional solenoid valve is characterized in that a tool hole which is coaxially arranged with the adjusting hole is formed in the bottom of the electromagnetic assembly, a sealing cover is arranged at one end, deviating from the adjusting hole, of the tool hole, and the sealing cover is opened or closed.

The normally closed type proportional electromagnetic valve is characterized in that a plurality of clamping grooves which are arranged at intervals are formed in the inner wall of the orifice of one end, away from the adjusting hole, of the tool hole, and a plurality of convex rings which correspond to the clamping grooves in a one-to-one mode are arranged on the edge of the sealing cover.

The normally closed type proportional solenoid valve comprises a normally closed type proportional solenoid valve body, wherein the normally closed type proportional solenoid valve body further comprises a connecting portion extending from the edge of the sealing cover, a mounting hole is formed in one end, deviating from the sealing cover, of the connecting portion, a fixing hole is formed in the side, located in the tool hole, of the electromagnetic assembly, a screw penetrates through the mounting hole and then is connected with the fixing hole, meanwhile, a hidden groove is formed in the electromagnetic assembly, the opening edges of the tool hole and the fixing hole are flared, the two ends of the hidden groove are communicated with the flaring of the tool hole and the flaring of the fixing hole respectively, and when the sealing cover is mounted on the tool hole, the connecting portion is embedded in the hidden groove.

The positive effects of the technical scheme are as follows:

foretell normal close formula proportion solenoid valve, through seting up the regulation hole and installing adjusting screw on the disk seat, and simultaneously, set up the spring between case and adjusting screw, make follow-up use and lead to accessible adjusting screw to adjust the spring force under the condition that spring force reduces, and simultaneously, the slide opening on the valve body and the inlay hole on the disk seat are the cylinder hole, and the aperture of slide opening and inlay hole all is greater than or equal to the diameter of case, additionally, adjusting screw's in the regulation hole diameter is greater than the diameter of spring, made things convenient for the spring, the direct change of taking out of quick-wear structures such as case, the problem of the high cost that needs the whole change to lead to has been avoided, do benefit to the wide use of normal close formula proportion solenoid valve.

Drawings

Fig. 1 is a structural diagram of an embodiment of a normally closed proportional solenoid valve according to the present invention;

fig. 2 is an exploded view of a sealing cover of a preferred embodiment of the present invention when mounted on an electromagnetic assembly.

In the drawings: 1. a valve body; 11. a slide hole; 12. an oil inlet; 13. an oil outlet; 2. a valve seat; 21. embedding holes; 22. an adjustment hole; 3. a valve core; 31. an armature; 32. a valve housing; 321. an oil passing hole; 4. a spring; 5. an electromagnetic assembly; 51. a tool hole; 52. a fixing hole; 53. hiding the groove; 511. a card slot; 6. an adjusting screw; 7. a limiting ring; 71. through the aperture; 8. connecting sleeves; 81. a housing; 9. a sealing cover; 91. a convex ring; 92. a connecting portion; 921. and (7) mounting holes.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the following embodiments are specifically described with reference to fig. 1 to 2, but the following contents are not intended to limit the present invention.

Fig. 1 is a structural diagram of an embodiment of a normally closed proportional solenoid valve according to the present invention. As shown in fig. 1, the normally closed proportional solenoid valve provided in this embodiment includes: the valve comprises a valve body 1, a valve seat 2, a valve core 3, a spring 4, an electromagnetic assembly 5 and an adjusting screw 6.

Specifically, the valve body 1 is arranged in a cylindrical shape, and is convenient to process. The valve body 1 is provided with slide holes 11 penetrating both ends thereof as a space for the flow of the oil and the movement of the valve element 3. At this moment, the one end of slide opening 11 is oil inlet 12, external fluid gets into to slide opening 11 from oil inlet 12 promptly, and simultaneously, set up the oil-out 13 of a plurality of intercommunication slide openings 11 on the lateral wall of the one end that valve body 1 was provided with oil inlet 12, make the fluid that gets into to slide opening 11 can discharge through oil-out 13, thereby realize the intercommunication of fluid passageway, for follow-up realization flow control provides the condition, and simultaneously, set up oil inlet 12 and oil-out 13 in the same one end of valve body 1, can conveniently carry out bayonet installation, and structural design is more reasonable.

Specifically, the valve seat 2 is also arranged in a cylindrical shape, and at this time, one end of the valve seat 2 is provided with an embedding hole 21, and conditions are provided for the subsequent movement of the valve element 3 through the embedding hole 21. And, the one end that the disk seat 2 was provided with the inlay hole 21 is connected with the one end that the valve body 1 deviates from oil inlet 12, has realized the interconnect of disk seat 2 and valve body 1, constitutes overall structure, provides the condition for follow-up removal of case 3. In addition, the other end of the valve seat 2 is provided with an adjusting hole 22 communicated with the embedding hole 21, so that the valve core 3 positioned at the embedding hole 21 can be adjusted through the adjusting hole 22 subsequently, the adjusting requirement is met, and the adjusting operation is more convenient.

Specifically, the valve core 3 is also arranged in a cylindrical shape, and at the moment, the valve core 3 is arranged in the sliding hole 11 in a sliding mode, so that the valve core 3 can slide in the sliding hole 11, and a structural basis is provided for meeting the demand of flow regulation through the movement of the valve core 3 in the follow-up process. In addition, one end of the valve core 3 extends into the embedding hole 21, namely, an avoiding space is provided for the movement of the valve core 3 through the embedding hole 21, the movement stroke of the valve core 3 is ensured, meanwhile, the guide is also provided for the movement of the valve core 3, the movement stability of the valve core 3 is ensured, and therefore the adjusting precision is improved. In addition, one end of the valve core 3 closes the oil outlet 13 in the initial state, namely a normally closed structure is formed, the use requirement of a non-conduction oil liquid channel in the initial state is met, when the valve core 3 slides, the oil outlet 13 is opened at one end of the valve core 3, the flow cross section of the oil outlet 13 is gradually increased, the adjustment of the cross section of the oil liquid flow channel is met, and therefore the adjustment of the flow of the proportional electromagnetic valve is achieved. In addition, all be the cylinder hole with slide opening 11 and inlay hole 21 and arrange for slide opening 11 and inlay hole 21 cross section everywhere all is unanimous, simultaneously, the aperture that sets up slide opening 11 and inlay hole 21 all is more than or equal to the diameter of case 3, thereby makes case 3 take out from slide opening 11 and inlay hole 21 smoothly, directly changes case 3 after 3 damages for follow-up case, provides the condition, and it is convenient to change, need not the whole change of proportional solenoid valve, and the cost is lower.

Specifically, set up spring 4 in adjusting hole 22, spring 4's one end stretches out outside adjusting hole 22, and spring 4 stretches out the outer one end of adjusting hole 22 and supports and lean on in case 3 stretches into to inlaying one end in hole 21, provide prestressing force for case 3 through spring 4 promptly, make case 3 can compression spring 4 after the action under electromagnetic component 5's effect, and can reset and drive case 3 through spring 4 when electromagnetic component 5 does not act on case 3 and reset, realize that proportion solenoid valve's normally closed state maintains, structural design is more reasonable.

Concretely, with adjusting screw 6 threaded connection in regulation hole 22, through screwing up or unscrewing adjusting screw 6 promptly, can adjust the position of adjusting screw 6 in regulation hole 22, and, spring 4 deviates from and leans on the one end that leans on case 3 to lean on adjusting screw 6, realize the regulation to the prestressing force size that spring 4 applyed on case 3 promptly through screwing up or unscrewing of adjusting screw 6, can not only adjust the sensitivity of proportion solenoid valve, can also lead to under the condition that spring 4 power reduces in long-time use, can maintain the size of spring 4 power unanimously through screwing up adjusting screw 6, the regulation precision has been ensured. In addition, the diameter of the adjusting screw 6 is larger than that of the spring 4, so that the diameter of the spring 4 is smaller than that of the adjusting hole 22, the spring 4 can be directly taken out and replaced when the adjusting screw 6 is screwed out, replacement is more convenient, the integral replacement of the proportional electromagnetic valve can be avoided, and the cost is lower.

Specifically, outside disk seat 2 was located to the cover of electromagnetism subassembly 5, realized the installation of electromagnetism subassembly 5 on disk seat 2, simultaneously, electromagnetism subassembly 5 set up in disk seat 2 and valve body 1's junction for electromagnetism subassembly 5 can correspond the case 3 of valve body 1 and disk seat 2 department, thereby promotes case 3 and removes in slide opening 11, thereby realizes the regulation to the flow.

More specifically, the valve element 3 sliding in the slide hole 11 further includes an armature 31, and in this case, the armature 31 has a columnar structure and can be adapted to the columnar valve body 1 and the valve seat 2. One end of the armature 31 extends into the embedding hole 21, a movement avoiding space is provided for the armature 31 through the embedding hole 21, and meanwhile, a guide is provided for the movement of the armature 31, so that the stability of the movement of the armature 31 is ensured. In addition, the other end of the armature 31 extends to the oil outlet 13, one end of the armature 31 extending to the oil inlet 12 is arranged in a variable cross section mode, a step formed at the variable cross section covers the oil outlet 13 in an initial state, a normally closed structure is formed, when the electromagnetic assembly 5 acts on the armature 31 to drive the armature 31 to move, the step of the armature 31 moves towards one side of the valve seat 2, the oil outlet 13 is gradually opened by the step, and due to the fact that the cross sections of the two sides of the step are different, oil entering from the oil inlet 12 can enter the oil outlet 13 through the end with the small cross section, and the oil conducting requirement is met.

More specifically, the valve core 3 further includes a valve sleeve 32 in addition to the armature 31, at this time, the valve sleeve 32 is fixedly sleeved in the sliding hole 11, and the valve sleeve 32 is slidably disposed outside the armature 31, that is, the armature 31 slides in the valve sleeve 32, and the valve sleeve 32 guides the movement of the armature 31 in the sliding hole 11, so as to provide a condition for directly replacing the valve sleeve 32 instead of replacing the valve body 1 after subsequent wear. Meanwhile, two ends of valve sleeve 32 extend to two sides of oil outlet 13 respectively, that is, valve sleeve 32 can cover oil outlet 13 on valve body 1, providing conditions for opening or closing oil outlet 13 by subsequent actions of armature 31 and valve sleeve 32. Moreover, the valve sleeve 32 is provided with a plurality of oil passing holes 321, and the plurality of oil passing holes 321 correspond to the plurality of oil outlets 13 one to one, that is, the oil outlets 13 and the hollow part of the valve sleeve 32 are communicated through the oil passing holes 321, so that the subsequent armature 31 can be regarded as a switch for the oil outlet when moving in the valve sleeve 32 and matching with the opening and closing of the oil passing holes 321, and the flow regulation requirement can still be ensured.

More specifically, the valve body 1 is further provided with a limiting ring 7, and at the moment, the limiting ring 7 is provided with a through hole 71, so that oil can flow at two ends of the limiting ring 7 through the through hole 71. Meanwhile, the limiting ring 7 is in threaded connection with the oil inlet 12, so that the limiting ring 7 is convenient to mount on the valve body 1, and meanwhile, the smoothness of the oil inlet 12 is ensured. In addition, in an initial state, one end of the valve core 3, which opens or closes the oil outlet 13, abuts against the limit ring 7, namely, the valve core 3 is limited by the limit ring 7, and the problem that the valve core 3 falls from the valve body 1 is prevented.

More specifically, the electromagnetic component 5 that the cover was located outside the disk seat 2 is the tubbiness and arranges, can adapt to the disk seat 2 shape that is cylindricly to arrange. Simultaneously, disk seat 2 sets up in electromagnetic component 5's bucket inner chamber, electromagnetic component 5 is one end open-ended and surrounds the structure partly promptly, and, the bung hole of electromagnetic component 5 covers disk seat 2 and valve body 1's junction, make electromagnetic component 5 can wrap up disk seat 2 and valve body 1's part position, thereby realize being provided with the parcel of the one end of adjusting hole 22 to disk seat 2, even make because of the leakage appears in adjusting screw 6 isotructure department, the fluid of leakage can not flow yet, the protection to adjusting screw 6 has also been realized simultaneously, the problem of the spring 4 to the prestressing force size of case 3 has been prevented from being bumped adjusting screw 6 by the mistake, the safety guarantee nature is higher.

More specifically, the junction between valve body 1 and disk seat 2 still is provided with adapter sleeve 8, at this moment, adapter sleeve 8 cover is located valve body 1 and disk seat 2 outside and is located valve body 1 and disk seat 2's junction, realized the both ends of adapter sleeve 8 respectively with valve body 1 and disk seat 2 be connected, simultaneously, the both ends of adapter sleeve 8 respectively with valve body 1 and disk seat 2 welded connection, form an integral structure with valve body 1 and disk seat 2 through adapter sleeve 8 promptly, ensured the reliability that valve body 1 and disk seat 2 are connected. It is worth pointing out that, all set up the groove of dodging of indent on the outer wall of valve body 1 and disk seat 2, the both ends of adapter sleeve 8 extend to the inslot of dodging on valve body 1 and the disk seat 2 respectively, simultaneously, the degree of depth of dodging the groove is unanimous with the wall thickness of adapter sleeve 8 to when making adapter sleeve 8 install between valve body 1 and disk seat 2, valve body 1, adapter sleeve 8 and disk seat 2 three's outer wall can flush, establish for follow-up electromagnetic component 5's cover and provide convenience.

More specifically, still be provided with shell 81 outside electromagnetic component 5 and the disk seat 2, outside electromagnetic component 5 and the valve body 1 were located to the shell 81 cover, preferably, shell 81 was the metal material, has strengthened the joint strength between electromagnetic component 5 and the valve body 1 through shell 81, also realizes the protection to electromagnetic component 5 simultaneously, and structural design is more reasonable.

Fig. 2 is an exploded view of a sealing cover of a preferred embodiment of the present invention when mounted on an electromagnetic assembly. As shown in fig. 1 and fig. 2, a tool hole 51 has been further opened on the barrel bottom of the electromagnetic component 5, and when the electromagnetic component 5 is installed on the valve seat 2, the tool hole 51 is arranged coaxially with the adjusting hole 22, and the tool hole 51 runs through the barrel bottom of the electromagnetic component 5, so that a maintenance worker can stretch tools such as a screwdriver into the adjusting hole 22 on the valve seat 2 through the tool hole 51, conveniently adjust the adjusting screw 6 in the adjusting hole 22 by means of the tool, the adjusting requirement can be met without dismantling the electromagnetic component 5, the protective effect of the electromagnetic component 5 on the adjusting screw 6 can be maintained, and the adjusting requirement on the adjusting screw 6 can be met. In addition, the one end that instrument hole 51 deviates from regulation hole 22 is provided with sealed lid 9, and sealed lid 9 is opened or airtight instrument hole 51, adjusts instrument hole 51's the state of opening and close through sealed lid 9 promptly, when needs overhaul promptly, instrument hole 51 is opened to the sealed lid 9 of accessible, and at normal use state, the sealed lid 9 of accessible covers instrument hole 51, can satisfy the regulation demand, can satisfy the protection demand again, and structural design is more reasonable. It should be noted that the diameter of the tool hole 51 is greater than or equal to the diameter of the adjusting hole 22, so that the adjusting screw 6 and the spring 4 can be directly taken out of the tool hole 51 when the spring 4 needs to be replaced later, and the operation is more convenient. In addition, the sealing cover 9 is made of rubber, has better deformation capacity and better sealing effect, and is easy to open and close.

More specifically, the draw-in groove 511 of a plurality of interval arrangements has been seted up on the inner wall in the drill way of the one end that the instrument hole 51 deviates from regulation hole 22, it can be relatively independent to have guaranteed a plurality of draw-in grooves 511, and simultaneously, be provided with a plurality of bulge loops 91 with a plurality of draw-in grooves 511 one-to-one on the border of sealed lid 9, make when needs seal the instrument hole 51 through sealed lid 9 and seal, sealed lid 9 is filled in instrument hole 51, make bulge loop 91 block in the draw-in groove 511 that corresponds, can play limiting displacement, sealed lid 9 has been prevented to deviate from in the instrument hole 51, can also make a bulge loop 91 and a draw-in groove 511 homoenergetic form a seal structure, thereby realize the multilayer is sealed, ensure the sealed effect of sealed lid 9.

More specifically, still be provided with a connecting portion 92 that extends from its border on the sealed lid 9, at this moment, the one end that connecting portion 92 deviates from sealed lid 9 is provided with mounting hole 921, simultaneously, and the side that just is located tool hole 51 on electromagnetic component 5 is provided with fixed orifices 52, and tool hole 51 and fixed orifices 52 interval arrangement, and fixed orifices 52 are the blind hole structure, have avoided fixed orifices 52 department to appear the problem of leaking. Meanwhile, a screw passes through the mounting hole 921 and then is connected with the fixing hole 52, namely, the connection between the sealing cover 9 and the electromagnetic assembly 5 is realized through the screw and the connecting part 92, and the problem that the sealing cover 9 is lost after being opened in the maintenance process due to the fact that the sealing cover 9 is small is prevented. Meanwhile, the electromagnetic assembly 5 is provided with the hidden groove 53, the opening edges of the tool hole 51 and the fixed hole 52 are arranged in a flaring manner, two ends of the hidden groove 53 are communicated with flaring openings of the tool hole 51 and the fixed hole 52 respectively, namely, the hidden groove 53 is used as a communicating structure between the tool hole 51 and the fixed hole 52, when the sealing cover 9 is installed on the tool hole 51, the connecting part 92 used for installing the sealing cover 9 on the electromagnetic assembly 5 can be embedded in the hidden groove 53, so that the connecting part 92 and the sealing cover 9 are prevented from protruding out of the surface of the electromagnetic assembly 5, and the flatness of the bottom of the electromagnetic assembly 5 is ensured.

In a preferred embodiment, the sealing cover 9 and the connecting portion 92 are of an integral structure, and can be formed by injection molding, so that the processing is convenient, and the structural strength is higher.

The normally closed proportional solenoid valve provided by the embodiment comprises a valve body 1, a valve seat 2, a valve core 3, a spring 4, an electromagnetic assembly 5 and an adjusting screw 6; through connecting valve body 1 and disk seat 2, slide case 3 and set up in valve body 1 and disk seat 2, simultaneously, regulation hole 22 has been seted up on disk seat 2, and set up adjusting screw 6 in regulation hole 22, and be provided with spring 4 between adjusting screw 6 and the case 3, can realize the regulation of the prestressing force size of spring 4 to case 3 through twisting of adjusting screw 6, satisfy the long-time use back spring 4 because of fatigue when leading to spring 4 power to reduce adjusting screw 6 and adjust the user demand of spring 4 power, simultaneously, the slotted eye 21 on slide hole 11 on the valve body 1 and the disk seat 2 is the cylinder hole, and the aperture of slide hole 11 and slotted eye 21 all is greater than or equal to the diameter of case 3, adjusting screw 6's diameter is greater than the diameter of spring 4, the convenience can directly take out the change after wearing and tearing structure such as follow-up spring 4, case 3 appear damaging, need not wholly to change, and overhaul cost has been reduced, do benefit to the use and the popularization of normal proportion solenoid valve.

The above is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, and it should be appreciated by those skilled in the art that various equivalent substitutions and obvious changes made in the specification and drawings should be included within the scope of the present invention.

Claims (10)

1. A normally closed proportional electromagnetic valve comprises a valve body, a valve seat, a valve core, a spring and an electromagnetic assembly, and is characterized by also comprising an adjusting screw, wherein,

the valve body is provided with a sliding hole penetrating through two ends, one end of the sliding hole is an oil inlet, and the side wall of the end of the valve body, which is provided with the oil inlet, is provided with a plurality of oil outlets communicated with the sliding hole;

one end of the valve seat is provided with an embedding hole and is connected with one end of the valve body, which is far away from the oil inlet, and the other end of the valve seat is provided with an adjusting hole communicated with the embedding hole;

the valve core is arranged in the sliding hole in a sliding mode, one end of the valve core extends into the embedded hole, one end of the valve core closes the oil outlet in an initial state, the oil outlet is opened at one end of the valve core when the valve core slides, the sliding hole and the embedded hole are cylindrical holes, and the hole diameters of the sliding hole and the embedded hole are larger than or equal to the diameter of the valve core;

the spring is arranged in the adjusting hole, and one end of the spring is abutted against one end of the valve core extending into the embedded hole;

the adjusting screw is in threaded connection with the adjusting hole and tightly abuts against the other end of the spring, and the diameter of the adjusting screw is larger than that of the spring;

the electromagnetic assembly is sleeved outside the valve seat and is positioned at the joint of the valve seat and the valve body.

2. The normally closed type proportional solenoid valve according to claim 1, wherein the valve core includes an armature, the armature is of a cylindrical structure, one end of the armature extends into the embedded hole, the other end of the armature extends to the oil inlet, one end of the armature extending to the oil inlet is arranged in a variable cross section, and a step formed at the variable cross section covers the oil outlet in an initial state.

3. The normally closed type proportional solenoid valve of claim 2, wherein the valve core further comprises a valve sleeve, the valve sleeve is fixedly sleeved in the sliding hole, the valve sleeve is slidably sleeved outside the armature, two ends of the valve sleeve extend to two sides of the oil outlet respectively, the valve sleeve is provided with a plurality of oil passing holes, and the oil passing holes correspond to the oil outlets one to one.

4. The normally closed type proportional solenoid valve according to claim 1, further comprising a limit ring, wherein a through hole is formed in the limit ring, the limit ring is connected in the oil inlet in a threaded manner, and in an initial state, one end of the valve core, which opens or closes the oil outlet, abuts against the limit ring.

5. The normally closed proportional solenoid valve of claim 1, wherein the solenoid assembly is arranged in a barrel shape, the valve seat is disposed in a barrel inner cavity of the solenoid assembly, and a barrel opening of the solenoid assembly covers a joint of the valve seat and the valve body.

6. The normally closed type proportional solenoid valve according to claim 1, wherein a connecting sleeve is disposed between the valve body and the valve seat, the connecting sleeve is disposed outside the valve body and the valve seat and located at a joint of the valve body and the valve seat, and meanwhile, two ends of the connecting sleeve are respectively welded to the valve body and the valve seat.

7. The normally closed proportional solenoid valve of claim 1, further comprising a housing sleeved outside the solenoid assembly and the valve body.

8. The normally closed type proportional solenoid valve as claimed in claim 5, wherein a tool hole is formed in the bottom of the electromagnetic assembly and is coaxial with the adjusting hole, and a sealing cover is disposed at an end of the tool hole away from the adjusting hole and opens or closes the tool hole.

9. The normally closed type proportional electromagnetic valve according to claim 8, wherein a plurality of clamping grooves arranged at intervals are formed in an inner wall of an orifice at one end of the tool hole, which is away from the adjusting hole, and a plurality of convex rings corresponding to the clamping grooves in a one-to-one manner are arranged on an edge of the sealing cover.

10. The normally closed type proportional electromagnetic valve according to claim 8 or 9, wherein the sealing cover further includes a connecting portion extending from an edge thereof, a mounting hole is provided at an end of the connecting portion away from the sealing cover, a fixing hole is provided on the electromagnetic assembly and beside the tool hole, and a screw passes through the mounting hole and then is connected to the fixing hole.

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