CN109707852A - A kind of solenoid valve - Google Patents

Abstract

The invention discloses a kind of solenoid valves, the solenoid valve includes valve body, coil, the valve deck for cooperatively forming with the valve body valve chamber, the core iron part being fixedly connected with the valve deck, the valve body includes valve port portion, the solenoid valve further include: sleeve, the sleeve is set in the valve chamber and the valve chamber is divided into inner cavity chamber and exocoel, and the inner cavity chamber is connected to the exocoel by communicating passage；Piston, the piston is driven by the core iron part, can the relatively described sleeve be axially moveable, the inner cavity chamber is divided into upper chamber and lower chambers by the piston, the piston includes the balance hole for being connected to the upper chamber Yu the lower chambers, the piston further includes the annular canister portion with sleeve cooperation, sealing element is equipped between the periphery wall of the annular canister portion and the internal perisporium of the sleeve, the annular canister portion has sealing close to the end in the valve port portion, when the sealing is against the valve port portion, the annular canister portion closes the communicating passage.During the electromagnetic valve work, piston not will form pressure difference in two sides up and down, it is easier to realize valve opening, close valve, effectively increase the action performance of solenoid valve.

Description

A kind of solenoid valve

Technical field

The present invention relates to fluid control technology field more particularly to a kind of solenoid valves.

Background technique

Solenoid valve be it is a kind of be used in refrigeration, refrigeration, the valve in refrigeration system, pass through the energization of control coil, power-off The open and close for realizing solenoid valve valve port is mainly used to control the on-off of flow path.

It is living during piston moves down when closing valve when solenoid valve is cooperated using piston and valve port to control opening and closing Side generates back pressure beyond the Great Wall, and piston upper and lower sides is made to form pressure difference, and lower lateral pressure is greater than upper lateral pressure, and piston is hindered to move down； Piston upper and lower sides also will form pressure difference when valve opening, and piston is hindered to move up.

In view of this, how to improve solenoid valve action performance is that those skilled in the art's technology urgently to be resolved at present is asked Topic.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of solenoid valve, and the structure design of the solenoid valve makes valve opening, closes valve It is easy, improves the action performance of solenoid valve.

In order to solve the above technical problems, the present invention provides a kind of solenoid valve, including valve body, coil and the valve body cooperate The valve deck for forming valve chamber, the core iron part being fixedly connected with the valve deck, the valve body includes valve port portion, which also wraps Include: sleeve, the sleeve are set in the valve chamber and the valve chamber are divided into inner cavity chamber and exocoel, the inner cavity chamber and institute Exocoel is stated to be connected to by communicating passage；Piston, the piston are driven by the core iron part, can the relatively described sleeve along axis To movement, the inner cavity chamber is divided into upper chamber and lower chambers by the piston, the piston include be connected to the upper chamber with The balance hole of the lower chambers, the piston further include the annular canister portion with sleeve cooperation, the periphery of the annular canister portion Sealing element is equipped between wall and the internal perisporium of the sleeve, the annular canister portion has sealing close to the end in the valve port portion Portion, when the sealing is against the valve port portion, the annular canister portion closes the communicating passage.

Using this structure, during electromagnetic valve work, piston not will form pressure difference in two sides up and down.With background technique phase Than, it is easier to it realizes valve opening, close valve, effectively increase the action performance of solenoid valve.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of specific embodiment of solenoid valve provided by the present invention；

Fig. 2 is the diagrammatic cross-section of piston and the first specific embodiment of core iron part cooperation in Fig. 1；

Fig. 3, Fig. 4 are that piston and the perspective view of second of specific embodiment of core iron part cooperation, section are illustrated in Fig. 1 Figure；

Fig. 5 is the diagrammatic cross-section of piston and the third specific embodiment of core iron part cooperation in Fig. 1；

Fig. 6 is the structural schematic diagram of another specific embodiment of solenoid valve provided by the present invention；

Fig. 7 is enlarged diagram at I in Fig. 6；

Fig. 8, Fig. 9 are main view, the perspective view of a kind of specific embodiment of gasket in Fig. 6；

Figure 10 is the partial enlargement diagram in Fig. 8 at A；

Figure 11 is the partial enlargement diagram of another specific embodiment of piston in Fig. 6.

Fig. 1 is into Figure 11:

Solenoid valve 1；

Valve body 2, valve chamber 21, inner cavity chamber 211, exocoel 212；

Upper chamber 2111, lower chambers 2112；

Valve port portion 22, side oral area 23, annular groove 24；

Gasket 25, rib 251, lug boss 252, communicating passage 26；

Core iron part 3, casing 31, core iron 32；

Receiving hole 321, holding tank 322, the first stopper 323；

End socket 33, the second stopper 34, returning spring 35, mandril 36；

Sleeve 4, groove 41, sealing element 42, opening portion 43；

Piston 5, connecting rod 51, flange 511；

Piston body 52, bottom 521, annular canister portion 522, balance hole 523；

The conical surface 524, step surface 525, sealing 526；

Interior sealing 5261, outer seal portion 5262；

Coil 6, valve deck 7.

Specific embodiment

Core of the invention is to provide a kind of solenoid valve, by the way that balance hole is arranged on piston, makes it during the work time, Piston not will form pressure difference in two sides up and down.Compared with the background art, it is easier to realize valve opening, close valve, effectively increase electromagnetism The action performance of valve.

It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention Applying example, the present invention is described in further detail.

It should be noted that the terms such as " upper and lower, inside and outside " what appears in this article are that position based on the figure is closed It is and establishes, the difference in product orientation shown with reference to the accompanying drawings, corresponding direction and positional relationship is also possible to become therewith Change, therefore, the absolute limit to protection scope can not be understood as.

In addition, " connection " between all parts referred to herein, including integrally formed also including the splicing of different components.

Fig. 1 is a kind of structural schematic diagram of specific embodiment of solenoid valve provided by the present invention；Fig. 2 is piston in Fig. 1 With the diagrammatic cross-section of the first specific embodiment of core iron part cooperation；Fig. 3, Fig. 4 are that piston and core iron part are matched in Fig. 1 The perspective view for second of the specific embodiment closed, diagrammatic cross-section；Fig. 5 is the third of piston and core iron part cooperation in Fig. 1 The diagrammatic cross-section of kind specific embodiment.

In a specific embodiment, as shown in Figure 1, the present invention provides a kind of solenoid valve 1, including valve body 2, coil 6 And valve deck 7, valve body 2 and valve deck 7 are connected through a screw thread or are sealed by being welded to connect, and between the two by O-ring.Valve body 2 Equipped with valve chamber 21, valve port portion 22 and side oral area 23, valve port portion 22 and side oral area 23 be respectively welded be connected with take over as into Mouth runner/outlet flow.

Specifically, valve deck 7 is provided with core iron part 3, coil 6 is arranged core iron part 3.Core iron part 3 includes casing 31, core Iron 32, end socket 33, returning spring 35.Valve deck 7 offers through-hole, and casing 31 is matched by the modes such as furnace weldering, flame welding and the through-hole It closes and fixes, and the lower end of casing 31 is flushed with the lower surface of valve deck 7, the upper surface of valve deck 7 is stretched out in upper end.End socket 33 passes through laser The modes such as weldering, argon arc welding seal the upper end for being fixed on casing 31.Core iron 32 is located in casing 31, and 32 upper end of core iron is equipped with and accommodates back The receiving hole 321 of multiple spring 35.When coil 6 is powered, core iron 32 moves up under the action of electromagnetic force；In the state that coil 6 powers off, Core iron 32 moves down under the spring-force driven dual of returning spring 35.

The sleeve 4 that valve chamber 21 is divided into inner cavity chamber 211 and exocoel 212 is provided in valve chamber 21.Inner cavity chamber 211 and outer Chamber 212 is connected to by communicating passage 26.Sleeve 4 can be fixedly connected by modes such as welding with valve deck 7, can also be with valve deck 7 is integrally formed.It is integrally formed herein and refers to that sleeve 4 and valve deck 7 process formation in same block of material.The internal perisporium of sleeve 4 is opened Equipped with groove, sealing element 42 is placed in groove, sealing element 42 can be O-ring etc. herein.Above-mentioned communicating passage 26 can be set It is formed between the lower end and valve port portion 22 of cylinder 4, opening portion 43 can also be opened up on sleeve 4 and is used as communicating passage 26.

Be equipped with piston 5 in sleeve 4, piston 5 by core iron part 3 drive can relative sleeve 4 be axially moveable, and by inner cavity Room 211 is divided into upper chamber 2111 and lower chambers 2112.Piston 5 includes connecting rod 51 and piston body 52.Connecting rod 51 has flange 511, piston body 52 includes bottom 521 and annular canister portion 522.Piston 5 is connect by flange 511 with core iron part 3.Bottom 521 Balance hole 523 equipped with connection upper chamber 2111 and lower chambers 2112.Preferably, the balance hole 523 be set as 2 or 2 with On, and be symmetrical arranged along the central axis of piston 5.It is arranged such, it can be ensured that during piston 5 moves axially, the left and right sides Uniform force, it is mobile steady, shaking is not generated.

Annular canister portion 522 cooperates with sleeve 4.Above-mentioned sealing element 42 also can be set to be opened up in annular 522 periphery wall of canister portion Groove in.Annular canister portion 522 has sealing 526 close to the end in valve port portion 22, when the sealing 526 is against valve port portion 22 When, annular canister portion 522 closes communicating passage 26, and sealing element 42 seals off upper chamber 2111 and exocoel 212.

Preferably, communicating passage 26 be sleeve 4 do not contact valve body 2 inner bottom surface and the circular passage formed or conduct The opening portion 43 of communicating passage 26 is symmetrical arranged along the central axis of sleeve 4.In this way, due to 26 relative sleeve 4 of communicating passage Central axis is symmetrical arranged, and in 1 course of work of solenoid valve, the pressure that fluid applies piston 5 is uniform, keeps piston 5 radial not Stress is conducive to the axial movement of piston 5.

Using this structure, in 1 course of work of solenoid valve, the pressure of the pressure of upper chamber 2111 and lower chambers 2112 is always Keep quite, making axial without pressure difference during the axial movement of piston 5, the circumferential pressure by exocoel 212 is uniform, it is radial not by Power.So that 1 valve opening of solenoid valve, pass valve are easier, its action performance is improved.

Further, as shown in figs 2-4, core iron part 3 includes core iron component, and core iron component includes core iron 32 and core The connector that 32 lower end of iron is fixedly connected, core iron 32 are equipped with the first stopper 323, and connector is equipped with the second stopper 34.On specifically, Stating the first stopper 323 is the step structure being located in 32 axially extending bore of core iron.When coil 6 powers off, supported by the first stopper 323 By the flange 511 of connecting rod 51, so that piston 5 be pushed to move axially downwards.Above-mentioned second stopper 34 can be retaining ring, practical operation In, first there is flange 511 to be partially placed into the holding tank 322 of 32 lower end of core iron connecting rod 51, then retaining ring passed through weldering It the modes such as connects and is fixed on 32 lower end of core iron；Second stopper 34 is also possible to the cutting ferrule bottom that side has opening, side opening It is put into for flange 511, cutting ferrule bottom and core iron 32 cooperatively form accommodating chamber, during axial movement, deviate from flange 511 not Cutting ferrule.In practical operation, which is first fixedly connected with core iron 32 by the modes such as welding, then by flange 511 from metallic sheath side The opening in face is put into, in this way, it is easier to operate compared to retaining ring scheme, it is simpler in technique, and high reliablity.

That is, when solenoid valve 1 close valve when, coil 6 power off, core iron 32 under the spring-force driven dual of returning spring 35 axially downwardly Mobile, the first stopper 323 pushes piston 5 to move axially downwards against flange 511, until sealing 526 is against valve port portion 22, so that pass valve is realized, at this point, there is predetermined gap H along axial between flange 511 and the second stopper 34；When 1 valve opening of solenoid valve When, it is powered to coil 6, core iron 32 moves axially upwards under the action of electromagnetic force, overcomes the spring force and envelope of returning spring 35 First 33 is attracting, and after the mobile predetermined gap H of core iron 32, the second stopper 34 is with flange 511 against thus axially upwards with piston 5 Mobile, sealing 526 leaves valve port portion 22, realizes valve opening.So set, in the valve opening initial stage, by the way that predetermined gap is arranged, Core iron 32 originally only by end socket suction, as core iron 32 moves axially upwards, suction is increasing, at this time band piston 5 to Upper movement is easier.In short, valve opening is easier by setting predetermined gap, the valve opening performance of solenoid valve 1 is improved.

Certainly, the fit system of core iron 32 and piston 5 can change design.As shown in figure 5, the axial direction of core iron 32 is logical Mandril 36 is additionally provided in hole, 36 upper end of mandril is abutted with 35 elasticity of returning spring, and lower end is abutted with connecting rod 51.When solenoid valve 1 closes When valve, coil 6 is powered off, and mandril 36 moves axially downwards under the spring-force driven dual of returning spring 35, and then pushes piston 5 axial It moves down, up to sealing 526 is against valve port portion 22, so that pass valve is realized, when the positive installation of solenoid valve 1 (such as 5 institute of attached drawing Show), core iron 32 is under the effect of gravity against flange 511, at this time between flange 511 and the second stopper 34 between axially with making a reservation for Gap H；It when 1 valve opening of solenoid valve, is powered to coil 6, core iron 32 moves axially upwards under the action of electromagnetic force, overcomes reply bullet The spring force of spring 35 and end socket 33 are attracting, and after the mobile predetermined gap H of core iron 32, the second stopper 34 is with flange 511 against thus band Piston 5 moves axially upwards, and sealing 526 leaves valve port portion 22, to realize pass valve.So set, when solenoid valve 1 is positive When installation, its valve opening performance can also be improved.

Further, above-mentioned predetermined gap H is set as 0.5-3mm.When H is less than 0.5mm, stroke setting is too small, split Valve performance influences little；When H is greater than 3mm, the axial stroke of core iron needs to lengthen, in this way, the axial length of core iron part 3 becomes It is long, it is unfavorable for the miniaturization of solenoid valve.

Fig. 6 is the structural schematic diagram of another specific embodiment of solenoid valve provided by the present invention；Fig. 7 is in Fig. 6 at I Enlarged diagram；Fig. 8, Fig. 9 are main view, the perspective view of a kind of specific embodiment of gasket in Fig. 6；Figure 10 is A in Fig. 8 The partial enlargement diagram at place.

As shown in Figure 6, Figure 7, annular groove 24 is offered at valve port portion 22, and gasket 25 is set in annular groove 24, it is close Packing 25 is made of flexible materials such as rubber, plastics.When solenoid valve 1 closes valve, sealing 526 and gasket 25 against, thus Close port portion 22.Since piston 5 is made of hard materials such as metals, gasket is made of flexible material, soft or hard material mating So that the sealing effect is better.

Specifically, gasket 25 by press fitting etc. modes be pressed into annular groove 24, gasket 25 be pressed before width Greater than the width of annular groove 24, make the inner sidewall and lateral wall interference fit of gasket 25 and annular groove 24.So set, It can ensure that the fluid for flowing into valve chamber 21 does not enter in annular groove 24, not will lead to the side pressure up and down being subject to due to gasket 25 Power is uneven and is detached from annular groove 24, causes to close defective valve.

It is contemplated that above-mentioned gasket 25 does not limit this fixed form, other component, such as metal can also be passed through Gasket etc., one end are connect with 2 rivet or weld of valve body, and the other end abuts pressing gasket 25, it is made not depart from annular groove 24.

In another specific embodiment, it is equipped with and is connected between the inner sidewall and the inner sidewall of annular groove 24 of gasket 25 The channel of 24 bottom of annular groove, and it is recessed equipped with annular is connected between the lateral wall of gasket 25 and the lateral wall of annular groove 24 The channel of 24 bottom of slot.Specifically, as Figure 8-Figure 10, the medial surface and lateral surface which can be gasket 25 are along axis To the rib 251 of setting, which protrudes from the side wall of gasket 25, and abuts inner sidewall and the outside of annular groove 24 Wall.So set, there is gap, for the inflow of the fluids such as refrigerant between article adjacent ribs 251.It similarly, can also be in annular groove 24 inner sidewall and lateral wall is processed to form rib, it may have same effect.

Alternatively, can be formed in the axially disposed groove up and down of medial surface and lateral surface of gasket 25, groove Gap, for the inflow of the fluids such as refrigerant.It is of course also possible to which the inner sidewall and lateral wall in annular groove 24 open up up and down Groove, as long as fluid can be made to flow into annular groove bottom.

Further, the bottom of gasket 25 is provided with lug boss 252.The lug boss 252 is located at 522 periphery of annular canister portion On the axis projection loop wire L of wall.Projection refers to being projected the shape of object in one plane with one group of light.Axis herein Refer to that light carries out the toroid of projection formation from axis direction to the periphery wall of annular canister portion 522 to projection loop wire.It is above-mentioned convex The portion of rising also can be set in the bottom of annular groove 24, and only the lug boss is big compared to 25 difficulty of processing of gasket, is not easy to grasp Make.

When so, it is possible to guarantee that solenoid valve 1 is closed, Fluid pressure suffered by 25 upper and lower sides of gasket is suitable, does not form pressure Difference makes it not depart from annular groove 24, improves sealing reliability.

Further, as shown in Figure 6, Figure 7, diameter is arranged in the internal perisporium of the one end of annular canister portion 522 close to valve port portion 22 The radial width of the conical surface 524 being gradually increased, above-mentioned sealing 526 is less than 0.1mm.Ideally, the conical surface 524 and annular Face where the periphery wall of canister portion 522 is crossed to form above-mentioned sealing, and the sealing and gasket 25 are linear sealing cooperation, i.e., should The radial width of sealing is ideally to be infinitely close to 0.Therefore consider for actual production, by the diameter of the sealing 526 0.1mm is set smaller than to width.The above-mentioned conical surface 524 can be inclined-plane, be also possible to the curved surfaces such as arc surface.In this way, the sealing Portion 526 and lug boss 252 are all located on the axis projection loop wire L of annular 522 periphery wall of canister portion, can guarantee that solenoid valve 1 is closed When, Fluid pressure suffered by 25 upper and lower sides of gasket is suitable, does not form pressure difference, so that gasket 25 is not departed from annular groove 24, mention High sealing reliability.

Also, due to being provided with the conical surface 524, when the valve port portion 22 of solenoid valve 1 is used as inlet channel, 23 conduct of side oral area When outlet flow, the high-pressure fluid of inlet channel generates the active force tilted upward to the first inclined-plane 524, and when valve opening helps to lift Piston 5 is risen, therefore, the setting conical surface 524 is conducive to improve valve opening performance.

Figure 11 is the partial enlargement diagram of another specific embodiment of piston in Fig. 6.

As shown in figure 11, the platform that the periphery wall setting diameter of the one end of annular canister portion 522 close to valve port portion 22 is gradually increased Terrace 525, above-mentioned sealing 526 include the interior sealing on the inside of the axis projection loop wire L of 522 periphery wall of annular canister portion 5261 and the outer seal portion 5262 on the outside of the axis projection loop wire L of annular 522 periphery wall of canister portion.It so, it is possible to improve electricity When magnet valve 1 is closed, the sealing performance of interior sealing 5261, outer seal portion 5262 and gasket 25 improves sealing reliability.

Meanwhile when the valve port portion 22 of solenoid valve 1 is used as outlet flow, when side oral area 23 is as inlet channel, pass valve shape Under state, since the forced area of annular canister portion 522 is greater than the forced area of interior sealing 5261, the high-pressure fluid pair of inlet channel Piston 5 has downward pressure, and therefore, such setting is conducive to improve sealing reliability when closing valve.

Also, due to being provided with step surface 525, when the valve port portion 22 of solenoid valve 1 is used as outlet flow, side oral area 23 is made When for inlet channel, the high-pressure fluid of inlet channel generates active force diagonally downward to step surface 525, helps to push away when closing valve Piston 5 moves down.

Certainly, above-mentioned step surface 525 can also make design for change, such as annular canister portion 522 close to the one of valve port portion 22 The conical surface that diameter is gradually increased is arranged in the periphery wall at end, also function and effect having the same, and details are not described herein.

Further, the axis projection loop wire L of 522 periphery wall of interior sealing 5261, outer seal portion 5262 and annular canister portion Radial distance be set as roughly equal.In this way, interior sealing and outer seal portion are equal by the power of piston 5 when solenoid valve 1 is closed It is even, and to be multiple-sealed, improve sealing reliability.

A kind of solenoid valve provided by the present invention is described in detail above.Specific case used herein is to this The principle and embodiment of invention is expounded, method of the invention that the above embodiments are only used to help understand and Its core concept.It should be pointed out that for those skilled in the art, in the premise for not departing from the principle of the invention Under, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection of the claims in the present invention In range.

Claims (11)

1. a kind of solenoid valve, the valve deck of valve chamber is cooperatively formed including valve body, coil, with the valve body and the valve deck is fixed and connected The core iron part connect, the valve body include valve port portion, which is characterized in that further include:

Sleeve, the sleeve are set in the valve chamber and the valve chamber are divided into inner cavity chamber and exocoel, the inner cavity chamber with The exocoel is connected to by communicating passage；

Piston, the piston are driven by the core iron part, can the relatively described sleeve be axially moveable, the piston will be described Inner cavity chamber is divided into upper chamber and lower chambers, and the piston includes the balance hole for being connected to the upper chamber Yu the lower chambers, institute State piston further include with the sleeve cooperation annular canister portion, it is described annular canister portion periphery wall and the sleeve internal perisporium it Between be equipped with sealing element, it is described annular canister portion close to the valve port portion end have sealing, the sealing is against the valve When oral area, the annular canister portion closes the communicating passage.

2. solenoid valve according to claim 1, which is characterized in that the sleeve is fixedly connected or described with the valve deck Sleeve and the valve deck are integrally formed；

The communicating passage is formed between the lower end of the sleeve and the valve port portion or the sleeve is equipped with described in conduct The opening portion of communicating passage.

3. solenoid valve according to claim 1, which is characterized in that the core iron part includes core iron component, the core iron Component includes the first stopper and the second stopper,

When coil is powered, after the mobile predetermined gap of the core iron component, second stopper drives the piston towards far from described The direction in valve port portion is mobile, and the sealing leaves the valve port portion；

When coil blackout, under the returning spring effect of the core iron part, first stopper is against the piston, the work The direction movement towards the valve port portion is filled in, the sealing is sealed against with the valve port portion.

4. solenoid valve according to claim 3, which is characterized in that the core iron component includes core iron and connector, described First stopper is set to the core iron, and second stopper is set to the connector.

5. solenoid valve according to claim 3, which is characterized in that the size of the predetermined gap is 0.5-3mm.

6. solenoid valve according to claim 1, which is characterized in that the valve port portion is equipped with annular groove, and the annular is recessed Gasket is equipped in slot, the gasket is made of rubber or plastic material, the inside of the gasket and the annular groove Wall and lateral wall interference fit.

7. solenoid valve according to claim 1, which is characterized in that the valve port portion is equipped with annular groove, and the annular is recessed Gasket is equipped in slot, the gasket is made of rubber or plastic material, and the inner sidewall of the gasket and the annular are recessed The channel for being connected to the annular groove bottom is equipped between the inner sidewall of slot, and the lateral wall of the gasket and the annular are recessed The channel for being connected to the annular groove bottom is equipped between the lateral wall of slot.

8. solenoid valve according to claim 7, which is characterized in that the bottom of the gasket or the bottom of the annular groove Portion is equipped with lug boss, and the boss is on the axis projection loop wire of the annular canister portion periphery wall.

9. solenoid valve according to claim 1-8, which is characterized in that the annular canister portion is close to the valve port portion The internal perisporium of one end include the diameter gradually big conical surface, the radial width of the sealing is less than 0.1mm.

10. solenoid valve according to claim 1-8, which is characterized in that the annular canister portion is close to the valve port The periphery wall of the one end in portion includes diameter gradually big step surface or the conical surface, and the sealing includes being located at the annular canister portion periphery Interior sealing on the inside of the axis projection loop wire of wall and outer on the outside of the axis projection loop wire of the annular canister portion periphery wall Sealing.

11. solenoid valve according to claim 10, which is characterized in that the interior sealing, the outer seal portion with it is described The radial distance of the axis projection loop wire of annular canister portion periphery wall is roughly equal.