CN208252794U - A kind of motor-driven valve - Google Patents

Abstract

The utility model discloses a kind of motor-driven valve, including valve component, the valve component includes valve core housing, and the valve core housing includes valve port portion；Screw component, the screw component include screw rod and bearing, and the bearing holder (housing, cover) is set to the lower end of the screw rod, and the bearing includes bearing inner ring and outer race；Core assembly, the core assembly is under the drive of the screw component, it can be moved axially relative to the valve core housing, the core assembly includes spool, the spool is at least partially disposed at the inner cavity of the valve core housing, the outer wall of the spool can include holding tank with the inner wall clearance sliding fit of the valve core housing, the spool；Elastic element, the elastic element is set to the holding tank, and the upper end of the elastic element is abutted with the outer race, and the lower end of the elastic element is abutted with the spool, the motor-driven valve of the utility model can reduce the abrasion between the spool of motor-driven valve and valve port portion.

Description

A kind of motor-driven valve

Technical field

The utility model relates to fluid control technology fields, more particularly to a kind of motor-driven valve.

Background technique

Significant components of the motor-driven valve as composition refrigeration system are widely used in freezing unit, freezer, supermarket's refrigerator etc.. Motor-driven valve generallys include valve component, driving assembly, screw component, core assembly, makes silk by the rotation driving of driving assembly Bar assembly acts on spool, so that core assembly be made to abut or separate the valve port portion of motor-driven valve, realizes that the flow of motor-driven valve is adjusted Function.A kind of motor-driven valve of background technique, on the one hand, the abrasion of its spool and the contact surface in valve port portion is big, will lead to motor-driven valve Internal leakage become larger.

Utility model content

The purpose of the application is to provide a kind of motor-driven valve, can reduce the abrasion between the spool of motor-driven valve and valve port portion.

A kind of motor-driven valve provided by the present application, including valve component, the valve component include valve core housing, the valve core housing Including valve port portion；Screw component, the screw component include screw rod and bearing, and the bearing holder (housing, cover) is set to the lower end of the screw rod Portion, the bearing include bearing inner ring and outer race, and the bearing inner ring can be circumferentially rotated relative to the outer race； Core assembly, the core assembly can move axially under the drive of the screw component relative to the valve core housing, described Core assembly includes spool, and the spool is at least partially disposed at the inner cavity of the valve core housing, and the outer wall of the spool can With the inner wall clearance sliding fit of the valve core housing, the spool includes holding tank；Elastic element, the elastic element are set to The holding tank, the upper end of the elastic element are abutted with the outer race, the lower end of the elastic element and the spool It abuts.

The motor-driven valve of the program, valve core housing include valve port, and screw component includes screw rod and bearing, and bearing includes bearing inner ring And outer race, bearing inner ring can be circumferentially rotated relative to outer race, core assembly includes spool, and spool includes accommodating Slot, elastic element are set to holding tank, and the upper end of elastic element is abutted with outer race, and lower end and the spool of elastic element support It connects, the abrasion between the spool of motor-driven valve and valve port portion can be reduced.

Detailed description of the invention

Fig. 1 show structural schematic diagram of the motor-driven valve of the utility model embodiment one under a certain valve opening state；

Fig. 2A show the three-dimensional structure diagram of Fig. 1 middle (center) bearing；

Fig. 2 B show the top view of bearing shown in Fig. 2A；

Fig. 2 C show the diagrammatic cross-section of bearing shown in Fig. 2A；

Fig. 3 show the partial schematic diagram of Fig. 1；

Fig. 4 show motor-driven valve shown in Fig. 1 in closed valve state partial schematic diagram for the moment；

Fig. 5 show partial schematic diagram of the motor-driven valve shown in Fig. 1 in closed valve state two；

Fig. 6 A show the structural schematic diagram of the motor-driven valve of the utility model embodiment two；

Fig. 6 B show the partial schematic diagram of Fig. 6 A；

Fig. 7 show the structural schematic diagram of the motor-driven valve of the utility model embodiment three；

Fig. 8 show the structural schematic diagram of the motor-driven valve of the utility model embodiment four.

Specific embodiment

It needs first to illustrate, the noun of locality used herein, such as "up" and "down", is attached with this paper specification It is defined on the basis of shown position in figure, related " axial direction " refers to the axis direction of motor-driven valve herein, specifically, such as along electricity The axis direction of the valve core housing of dynamic valve." radial direction " involved in herein refers to the side vertical with the axial direction of aforementioned motor-driven valve To.It should be appreciated that the use of the noun of locality is intended merely to the clear of description technique scheme and conveniently, it should not be to protection scope It is construed as limiting.

Herein referred " soft sealing material " refers to nonmetallic materials, and has the sealing that can be used in of certain elasticity Material.

Herein referred " taper portion can cooperate with the valve port portion of valve component ", including taper portion contacted with valve port portion with It closes motor-driven valve or adjusts the structure of the flow of motor-driven valve；It further include that taper portion is not contacted with valve port portion, by controlling taper portion The structure of the flow of motor-driven valve is adjusted relative to the axial movement in valve port portion.

It is with reference to the accompanying drawing and specific real in order to make those skilled in the art of the present technique more fully understand technical scheme It applies example to be further described technical scheme, especially mainly the core utility model point of technical scheme is made It is described in detail out.

Fig. 1 show structural schematic diagram of the motor-driven valve of embodiment one under a certain valve opening state, and Fig. 2A is shown in Fig. 1 The three-dimensional structure diagram of bearing, Fig. 2 B show the top view of bearing shown in Fig. 2A, and Fig. 2 C show bearing shown in Fig. 2A Diagrammatic cross-section, Fig. 3 show the partial schematic diagram of Fig. 1, and Fig. 4 show motor-driven valve shown in Fig. 1 in closed valve state office for the moment Portion's schematic diagram, Fig. 5 show partial schematic diagram of the motor-driven valve shown in Fig. 1 in closed valve state two.

As shown in Figure 1, the motor-driven valve of the present embodiment includes the valve component 10 with valve chamber 100, it further include screw component 20, core assembly 30, nut assembly 40, rotor assembly 50, elastic element 60, electromagnetic coil 70.Valve component 10 includes spool Set 13, core assembly 30 include spool 31, and spool 31 is at least partially disposed at the inner cavity of valve core housing 13, the outer wall energy of spool 31 Enough and valve core housing 13 inner wall clearance sliding fit, core assembly 30, can be relative to spool under the drive of screw component 20 13 axial movement of set, screw component 20 includes screw rod 21 and bearing 22, and bearing 22 is sheathed on the lower end 213 of screw rod 21, bearing 22 include bearing inner ring 221 and outer race 222, and bearing inner ring 221 can be circumferentially rotated relative to outer race 222.Spool 31 include holding tank 312 and taper portion 325, and taper portion 325 is set to the lower section of holding tank 312, and the taper portion 325 can be with The valve port portion 200 of valve component cooperates to adjust the flow of motor-driven valve, when motor-driven valve is closed, holding tank 312 and taper portion 325 Lower end be not connected to, elastic element 60 is set to holding tank 312, and the upper end of elastic element 60 is abutted with outer race 222, elasticity The lower end of element 60 is abutted with spool 31.Elastic element 60 can be specially compressed spring, reduce the spool and valve port of motor-driven valve Abrasion between portion.

The motor-driven valve of the technical program, during screw rod 21 is circumferentially rotated and is moved axially, outer race 222 relative to Spool 31 does not circumferentially rotate, and the upper end of elastic element 60 is abutted with outer race 222, the lower end of elastic element 60 and spool 31 abut, and therefore, core assembly 30 is not circumferentially rotated relative to valve port portion 200, is reduced spool 31 and is connect with valve port portion 200 The frictional force that contact portion position is subject to, the abrasion reduced between the spool 31 of motor-driven valve and valve port portion 200 can reduce the interior of motor-driven valve Leakage improves airtight performance when motor-driven valve valve closing.

Specifically, as shown in Figure 1, nut assembly 40 includes nut 41, spring guide rail 42, stop slip ring 43 and bulge loop 44. Wherein, the internal screw thread of nut 41 can match to form screw part with the external screw thread of screw rod 21.Bulge loop 44 is arranged in nut Nut 41 is simultaneously connect by 41 peripheries with lower valve body 12.Nut 41 and bulge loop 44 can injection moldings or solid otherwise together Fixed, the excircle on 41 top of nut is set with spring guide rail 42 and stop slip ring 43.Rotor assembly 50 includes rotor 51, arresting lever 52 and connection ring connecting the two 53, rotor 51 is fixedly connected with the upper end of screw rod 21 by connection ring 53.When rotor assembly 50 When screw rod 21 being driven to rotate, nut assembly 40 can convert linear motion for the rotation of screw rod 21, and then make screw component 20 It is able to drive the axial movement of core assembly 30.

Valve component 10 includes upper valve body 11, lower valve body 12, valve core housing 13, the first connecting tube 14.Specifically, upper valve body 11 Form valve chamber 100 after being welded and fixed with lower valve body 12, be connected with the first adapter tube 14 on the side wall of lower valve body 12, the first adapter tube 14 and Cavity 100 is connected to.Valve core housing 13 is fixedly connected with lower valve body 12.The upper end of valve core housing 13 is inserted into the inner hole of 41 lower end of nut In.

In the present embodiment, both valve core housing 13 and lower valve body 12 are split type structure, can be with by being pressed or being welded and fixed Understand, valve core housing 13 and lower valve body 12 may be integral structure, that is, be processed as a part.13 lower end of valve core housing It stretches out valve chamber 100 and is connected with the second adapter tube 15, that is, valve core housing 13 is partially provided in valve chamber 100 in the present embodiment, Valve core housing 13 with other components assembling before, substantially in axially through tubular structure, valve core housing 13 include inner cavity 131, this In embodiment, inner cavity 131 is surrounded by the internal groove side wall of valve core housing 13.The inner wall of valve core housing 13 can move the axial direction of core assembly 30 Dynamic to provide guiding, valve core housing 13 offers valve port portion 200, and valve port portion 200 is generally located in valve chamber 100.Specifically, valve core housing 13 Be provided with to 21 direction of screw rod it is axially extending in axially through annular convex platform 133, annular convex platform 133 formed valve port portion 200, Designing in this way is advantageous in that, since valve core housing 13 is fixedly connected with lower valve body 12, valve core housing 13 is provided with valve port portion 200 again, It is easier to improve the concentricity of the cooperation in valve port portion 200 and spool 31.

As shown in Figure 1 to Figure 3, screw component 20 includes screw rod 21, bearing 22.In the present embodiment, bearing 22 is set to appearance Receive slot 312.Bearing 22 includes bearing inner ring 221, outer race 222.The two can relatively rotate circumferentially.Outer race 222 outer wall can be relative to the cell wall clearance sliding fit of holding tank 312.Screw rod 21 includes the lower end cooperated with bearing 22 213 and it is set to the main part 212 of the top of lower end 213.Bearing 22 is sheathed on the outside of lower end 213.Outside main part 212 Wall is provided with external thread part, and the lower end surface of main part 212 and the periphery wall of lower end 213 form step surface first step directed downwardly The upper end in portion 211, bearing inner ring 221 is abutted with first step portion 211, the lower end riveting fixing bearing inner ring of lower end 213 221, it connect screw rod 21 with bearing inner ring 221, that is, bearing inner ring 221 can move axially together with screw rod 21.Screw rod 21 with This fixed form simple process of bearing inner ring 221, it is convenient.When bearing inner ring 221 moves axially together with screw rod 21, axis Outer ring 222 is held not circumferentially rotate relative to spool 31.In the present embodiment, bearing 22 include be set to bearing inner ring 221 with Ball 223 between outer race 222.It is understood that when bearing 22 uses different connection types from screw rod 21, silk Axially opposing displacement or circumferentially opposed rotation may occur between bar 21 and bearing 22, this does not influence the realization of this programme.

As shown in figures 1 and 3, core assembly 30 further includes sealing ring 33 made of retaining ring 32 and soft sealing material.It is close Seal ring 33 is mounted on spool 31.Spool 31 is at least partially disposed in the inner cavity 131 of valve core housing 13, the outer wall energy of spool 31 Enough and valve core housing 13 inner wall clearance sliding fit.Match since the outer wall of spool 31 can be slided with the inner wall gap of valve core housing 13 Close, during screw rod 21 is circumferentially rotated and is moved axially relative to valve core housing 13, due to spool 31 relative to valve core housing 13 not It circumferentially rotates, can only move axially, radial frictional force does not occur between spool 31 and valve core housing 13, valve can be made The movement of core 13 is more steady.According to the variation of 13 structure of valve core housing, valve core housing can also be stretched out or not stretched out in the lower end of spool 31 13。

Spool 31 can be specially brass material.As shown in figure 4, spool 31 includes holding tank 312 and taper portion 325, cone Shape portion 325 is set to the lower section of holding tank 312, during screw component 20 drives core assembly 30 to move axially, taper portion 325 can cooperate with valve port portion 200 to adjust the flow of motor-driven valve.Before assembling, 312 upper end of holding tank is in opening for spool 31 Shape, for the loading of other components.The upper end of spool 31 can pass through the modes such as welding, interference press-fitting and the fixed company of retaining ring 32 It connects, so that core assembly 30 can cooperate with screw component 20, screw component 20 is made to be able to drive the axial movement of core assembly 30.

In the present embodiment, specifically, the upper end of spool 31 is provided with the face-up second step portion 311 of step, retaining ring After 32 are set to the step surface in second step portion 311, the upper end of spool 31 and 32 riveting of retaining ring cooperate.The lower end 213 of screw rod 21, Bearing 22 and elastic element 60 are set in holding tank 312.After the bearing 22 and retaining ring 32 of screw component 20 contact, if screw rod The continuation of component 20 is moved axially upward, then screw component 20 is able to drive spool 31 and moves axially upwards, and makes core assembly 30 (not contacting) is disengaged with valve port portion 200.It is understood that the setting retaining ring 32 of core assembly 30 is also possible, at this moment, as long as The upper end of spool 31 is radially bent to form bending part to the direction of screw rod 21, is cooperated using bending part and bearing 22, is made Screw component 20 moves axially upwards also possible with movable valve plug 31.

As further design, sealing ring 33 can have the soft sealing material of similar performance to be made by PTFE etc., In this way, sealing element 33 can be installed on spool 31 by way of being arranged.Under the drive of screw component 20, sealing ring 33 Lower end surface can be abutted with valve port portion 200 (annular convex platform 131), so that motor-driven valve is closed.As a kind of specific embodiment, spool 31 specifically include cylindrical portion 313 and the flow control portion 314 below cylindrical portion 313, and holding tank 312 is set to cylindrical portion In 313.Wherein, in the present embodiment, sealing ring 33 is set in the peripheral part in flow control portion 314.Sealing ring 33 and spool 31 Connection is simple, without other components are added on valve, when the other structures of motor-driven valve are constant, makes the structure of motor-driven valve into one Step simplifies, and structure is simple, reduces process costs.Specifically, as shown in figure 4, flow control portion 314 includes annular groove section 315 With taper portion 325, annular groove section 315 is set to the top of taper portion 325, and the cross section of the outer wall of annular groove section 315 is big Cause rounded, taper portion 325 is in up big and down small pyramidal structure, i.e. taper portion 325 can be the lower end from annular groove section 315 Gradually small to 200 orient diameter of valve port portion, under the drive of screw component 20, the lower end surface of sealing ring 33 can be with annular convex platform The upper end face contact or separation in 133 (valve port portions 200), when sealing ring 33 is separated with annular convex platform 133, by controlling taper portion Aperture between 325 and valve port portion 200 can adjust the flow of motor-driven valve, that is, passing through taper portion 325 and valve port portion 200 Cooperate to adjust the flow of motor-driven valve.Cooperated using spool 31 and sealing ring 33, under the drive of screw component 20, sealing ring 33 It can abut or separate with valve port portion 200, being in for motor-driven valve is made to close or open state.When sealing ring 33 and valve port portion 200 When separation, the flow of motor-driven valve can be adjusted by the aperture between control valve core 31 and valve port portion 200.In this way, by motor-driven valve It opens, close, adjusting traffic engineering capability integrates, and reduces the internal leakage of motor-driven valve.

The motor-driven valve of the technical program, during screw rod 21 moves axially, outer race 222 will not relative to spool 31 It circumferentially rotates, the upper end of elastic element 60 is abutted with outer race 222 again, the lower end of elastic element 60 and holding tank 312 Bottom wall abut (being abutted with spool 31), therefore, sealing ring 33 will not be circumferentially rotated relative to valve port portion 200, reduction The frictional force that sealing ring 33 and annular convex platform 133 (valve port portion 200) contact site are subject to, reduces sealing ring 33 and convex annular The abrasion that platform 133 (valve port portion 200) contact site is subject to, can reduce the internal leakage of motor-driven valve, closed when improving valve valve closing Performance.

The setting substantially annular in shape of sealing ring 33, specifically, when installing sealing ring 33, sealing ring 33 is from taper portion 325 After lower end is inserted in, cooperated by interference press-fit approach and annular groove section 315, in this way, recessed by the way that annular is arranged on spool 31 Groove portion 315, and up big and down small pyramidal structure is set by the taper portion 325 of 315 lower section of annular groove section, it can be easily real The installation of existing sealing ring 33 and spool 31, amount of parts is few, easy to assembly without carrying out other techniques, more particularly to solve The problem of sealing ring mounting process complexity in minor-caliber electric valve, that is to say, that this sealing ring mounting means is particularly suitable for Minor-caliber electric valve.Further, in order to further ensure the cooperation reliability of sealing ring 33 and annular groove section 315, into One step ensures that sealing ring 33 will not be deviate from from annular groove section 315, and flow control portion 314 further includes being set to annular groove section Annular protrusion 316 between 315 and taper portion 325, annular protrusion 316 are the shorter circle of the constant height of cross-sectional diameter Cylindricality, the outer diameter of annular protrusion 316 is greater than the outer diameter of annular groove section 315, that is, annular protrusion 316 compares annular groove Portion 315 will be more slightly.The outer diameter for defining the annular protrusion is D1, and the outer diameter for defining the outer wall of the annular groove section is D2, The internal diameter for defining sealing ring is D3, then 0.15mm≤D1-D2≤0.25mm, and, 0≤D3-D2≤0.25mm.In this way, can protect The sealing ring 33 that prevents of card annular protrusion 316 deviates from the function of annular groove section 315, and can prevent outside annular protrusion 316 Diameter is excessive and influences the assembly of sealing ring 33.And the setting of this disconnecting prevention structure need not also increase circlip etc. with similar functions Components.

Sealing ring 33 can have the soft sealing material of similar performance to be made by PTFE etc., when the lower end surface of sealing ring 33 When with the upper end face contact of annular convex platform 133, taper portion 325 and annular convex platform 133 radially have predetermined gap, that is, cone cell Portion 325 is not contacted with valve port portion 200.The design of predetermined gap, on the one hand, 31 interference seal ring 33 of spool when can prevent from closing valve With the abutting of annular convex platform 133, on the other hand the size of predetermined gap can be adjusted according to the needs of motor-driven valve flow curve, Meet the requirement of different operating conditions.In addition, the structure setting of the setting of predetermined gap and sealing element 33, makes the opening and closing of motor-driven valve by close Seal ring 33 realizes that the flow of motor-driven valve is adjusted by the cooperation in taper portion 325 and valve port portion 200 Lai real with the cooperation of valve port portion 200 It is existing, as long as reducing the abrasion of sealing ring 33 Yu 200 contact site of valve port portion, it will be able to which the internal leakage for reducing motor-driven valve is easy to It realizes.On this basis, in the present embodiment, further, valve core housing 13 includes annular convex platform 133, that is, annular convex platform 133 is straight It connects and is formed on valve core housing 13, it is easy to process, further, it is possible to improve the coaxial of spool 31 and annular convex platform 133 (valve port portion 200) Degree.

The manufacturing method of the motor-driven valve of the present embodiment the following steps are included:

Prepare each part of valve component 10, screw component 20, core assembly 30, nut assembly 40 and rotor assembly 50 with And elastic element 60 and electromagnetic coil 70；

The lower end 213 of screw rod 20 is fixedly connected with the bearing inner ring 221 of bearing 22 as the first subassembly；It will sealing Ring 33 is sheathed with the annular groove section 315 of spool 31 from the taper portion 325 of spool 31；Elastic element 30 is assembled to spool 31 In holding tank 312；By being protruded into holding tank 312 from the upper opening portion of holding tank 312 for the first subassembly, and by retaining ring 32 with Fixed bearing 20 and elastic element 60 are limited in holding tank 312 in the upper end of spool 31 forms first assembly；

Lower valve body 12 and valve core housing 13 are welded and fixed or interference press fitting is fixedly connected to form the second component；

By first assembly from the valve core housing 13 that the taper portion 325 of spool 31 is extended partially into the second component, make the valve Core retainer plate 13 and spool 31 being capable of clearance sliding fits；

Nut assembly 40 is sheathed with to the periphery of screw rod 21, is threadedly engaged nut 41 with screw rod 21, nut 41 is passed through Bulge loop 44 is welded and fixed with lower valve body 12；Rotor assembly 50 is sheathed on to the periphery of nut assembly 40, and by screw rod 21 and rotor 51 are fixedly connected by connection ring 53；

Upper valve body 11 is located to the periphery of rotor assembly 50, upper valve body 11 is fixedly connected with lower valve body 12；

Electromagnetic coil 70 is fixed by the bracket to the periphery of valve component 10.

In above-mentioned manufacturing method, sealing ring 33 is directly sheathed with the annular groove section of spool 21 by the upper end of spool 31 315 just complete the fixation of sealing ring 33 Yu spool 31, and assembly method is simple, are not limited by the size of spool 31, especially suitable For small-bore motor-driven valve.

In the manufacturing method of the motor-driven valve of the present embodiment, specifically, the lower end 214 of screw rod 21 and 221 riveting of bearing inner ring Pressing is fixed, it will of course be understood that yes, in the manufacturing method of the present embodiment motor-driven valve, bearing inner ring 221 and screw rod 21 can also be with It is fixedly connected by modes such as circlips or nut described below.

The course of work of the motor-driven valve of the present embodiment is described below:

Fig. 1 and Fig. 3 show structural schematic diagram (sealing ring leaves valve port portion) when motor-driven valve is in a certain valve opening state, Fig. 4 show motor-driven valve be in closed valve state for the moment structural schematic diagram, Fig. 5 show motor-driven valve be in closed valve state two (from Together, screw rod moves down certain distance to closed valve state again).

As shown in Fig. 1 and Fig. 3, Fig. 4, when motor-driven valve is in a certain valve opening state certainly, the upper end of bearing 22 and core assembly 30 retaining ring 32 abuts, that is, bearing 22 supports retaining ring 32, and then supports spool 31, due to screw rod 21 and bearing inner ring 221 Be fixedly connected, spool 31 is fixedly connected with retaining ring 32 and sealing ring 33 again, then when screw rod 31 with rotor 51 relative to nut 41 when moving axially downwards, and core assembly 30 is being moved down with screw component 20 axially with respect to valve core housing 13 is axial together, this Core assembly 30 is always maintained at relative to the state that valve core housing 13 moves down to sealing ring 33 and valve with screw component 20 Until the upper-end contact in the valve port portion 200 (i.e. annular convex platform 131) of core retainer plate 13, that is, reaches sealing ring 33 and annular convex platform 131 is rigid State when contact is defined as closed valve state one, as shown in Figure 4.

During motor-driven valve above-mentioned moves to closed valve state one shown in Fig. 4 from a certain valve opening state shown in Fig. 3, Electromagnetic coil 70 is powered, and rotor 51 circumferentially rotates under the influence of a magnetic field, while screw rod 21 is rotated with the rotation of rotor 51, Since nut 41 is fixed by bulge loop 44 and lower valve body 12, screw rod 21 and nut 41 be threadedly engaged effect under, screw rod 21 1 While circumferentially rotating, one side is axially downward, and during screw rod 21 moves axially downwards, outer race 222 will not be with screw rod 21 circumferentially rotate.Elastic element 60 is connected between outer race 222 and spool 31 again, then during being somebody's turn to do, 60 phase of elastic element Axial displacement is not generated for spool 31, elastic element 60 does not generate elastic force to spool 31.Core assembly 30 leans on self gravity Effect is moved axially only with respect to valve core housing 13, is not acted on by radial frictional force between spool 31 and valve core housing 13, and spool 31 is dynamic It is improved as stationarity.

As shown in Figure 4 and Figure 5, it is in closed valve state a pair of electromagnetic coil 70 shown in Fig. 4 from motor-driven valve to continue to be powered, silk Bar 21 and bearing 22 move axially downwards together, 222 compression elastic element 60 of outer race, generate elastic element 60 by spool 31 elastic forces pushed to valve port portion 200 (annular convex platform 131), further make sealing ring 33 against annular convex platform 131, i.e., into one Step ensures to close valve reliability.In this process, since outer race 222 is not circumferentially rotated with screw rod 21, elastic element 60 is acted on Between outer race 222 and the bottom wall of holding tank 312, then spool 31 and sealing ring 32 are relative to (the valve port portion of annular convex platform 133 200) it does not circumferentially rotate, both valve port portion 200 and sealing ring 33 contact site not will receive the effect of circumferential frictional force, energy Enough reduce the internal leakage of motor-driven valve.

It should be noted that in the above-described embodiments, the valve port of motor-driven valve is set on valve core housing, and certainly, actual setting When, valve port can also be directly opened in lower valve body or in addition part is set and open up valve port on it, and in valve component Individual valve core housing is arranged in portion, is oriented to each connected components and core assembly.Similarly, the valve core housing in embodiment Can not be directly fixed with valve component, and valve core housing is fixed on other components, then other components are consolidated with valve component Fixed connection, alternatively, valve core housing and lower valve body are integrally formed.

Fig. 6 A show the structural schematic diagram of the motor-driven valve of the utility model embodiment two, and Fig. 6 B show the part of Fig. 6 A Schematic diagram.

The motor-driven valve of the present embodiment changes the company for being sealing ring and spool compared to the motor-driven valve of previous embodiment one Connect the variation of mode and the variation of corresponding flow control portion 314A.As shown, core assembly 30A includes spool 31A, spool 31A specifically includes cylindrical portion 313A and flow control portion 314A, the area of core assembly 30 shown in core assembly 30A and Fig. 1 It does not essentially consist in, when manufacturing the motor-driven valve of the embodiment, sealing ring 33A is directly injection-moulded in flow control portion by injected plastics material On 314A, have the material injection of similar performance on flow control portion 314A for example, by using PTFE etc., guarantees by injection molding intensity The reliability that sealing ring 33A is connect with the flow control portion 314A of spool 31A.The connection type of this spool and sealing ring also without Other components must be increased to be kept the structure of motor-driven valve simple, reduces component number under the premise of valve other structures are constant Amount.

Specifically, flow control portion 314A includes columnar part 317 and the taper portion 325A for being set to the lower section of columnar part 317, Taper portion 325A is gradually small from the lower end of columnar part 317 to 200 orient diameter of valve port portion, and sealing ring 33 is moulded in by injected plastics material The peripheral part of columnar part 317 is formed, such sealing ring generation type, without increase other components just by sealing ring 33A with Spool 31A connection, simple process reduce the amount of parts and processing step of motor-driven valve, also, such fixed form, phase For the fit system of sealing ring 33 shown in Fig. 1 and spool 31, advantage is essentially consisted in, this mounting means not by The limitation of the bore of motor-driven valve is not limited to small-bore valve, can be adapted for the valve of any bore, applied widely.In order to The fixation reliability between sealing ring 33A and spool 31A is further strengthened, the peripheral part of columnar part 317 is provided with annular convex rib 318A is arranged at intervals with two annular convex rib 318A in the peripheral part of columnar part 317 as a kind of preferable design scheme.It removes Outside design scheme using annular convex rib 318A, can also using flow control portion 314A peripheral part be arranged knurling structure or Other similar structures reinforce the fixed relatively reliable effect of sealing ring 33A and spool 31A as long as can be realized.This implementation The operating principle and other beneficial effects of the motor-driven valve of example are the same as example 1, here, being not repeated to describe.

It should also be noted that, the fit system of the motor-driven valve of the technical program, bearing and screw rod can make variation, only Make screw rod be able to drive bearing integrally to move axially and bearing inner ring is driven to circumferentially rotate, i.e., bearing inner ring and screw rod it Between do not move axially and circumferentially rotate, outer race is not moved axially relative to bearing inner ring, but can circumferentially be turned It is dynamic.As shown in fig. 7, Fig. 7 show the structural schematic diagram of the motor-driven valve of the utility model embodiment three.The electricity of the present embodiment Valve is moved, the difference with embodiment one is, the variation of the connection type of screw rod and bearing.It is no longer heavy to be the same as example 1 place Multiple narration.As shown in fig. 7, engaging has circlip 23 on the lower end 213B of screw rod 21B, and bearing 22 passes through circlip in the embodiment 23 connect with screw rod 21B it is also possible.It is understood that spiral shell can also be arranged on the 213B of lower end in the present embodiment Lower end 213B is connect by mother with bearing inner ring 221.The operating principle and beneficial effect and embodiment of the motor-driven valve of the present embodiment One is identical, here, being not repeated to describe.The manufacturing method of the motor-driven valve of the present embodiment is only that bearing compared with embodiment one From screw rod to be fixedly connected with mode different, be referred to the understanding of embodiment one.

It should also be noted that, the technical program is also applied for motor-driven valve shown in Fig. 8, Fig. 8 show the utility model The 4th kind of motor-driven valve structural schematic diagram, as shown in figure 8, the area of motor-driven valve shown in the motor-driven valve of the embodiment and embodiment one It is not that the structure of core assembly is different, in the present embodiment, core assembly 30C includes spool 31C and retaining ring 32C, but in spool The periphery of 31C is not provided with sealing ring shown in Fig. 1 and Fig. 6, this kind of electronic valve core 31C will not be sent out relative to valve port portion Life circumferentially rotates, and reduces spool 31C and annular convex platform 133 (valve port portion 200C) frictional force that contact site is subject to, reduces The abrasion that spool 31C and the contact site annular convex platform 133 (valve port portion 200C) are subject to, can reduce the internal leakage of motor-driven valve, mention Airtight performance when high threshold valve closing.It is understood that the structure of the valve port portion 200C of this kind of motor-driven valve is also not necessarily limited to convex annular Platform form can make corresponding change.The operating principle of the motor-driven valve of the present embodiment is similar to embodiment one, when only closing valve, It is directly contacted with valve port portion 200C by spool 31C, and the setting without sealing ring, the motor-driven valve of the present embodiment also have embodiment one Beneficial effect, here, being not repeated to describe.The manufacturing method of the motor-driven valve of the present embodiment is compared with embodiment one, without real The installation step in example one about sealing ring 33 is applied, other something in common are referred to the understanding of embodiment one.

It should be noted that annular convex platform (valve port portion) is set to valve core housing in embodiments set forth herein, it is possible to understand that , annular convex platform (valve port portion) is not arranged in also possible on valve core housing.For example, when valve core housing is split type structure, that is, Valve core housing is designed as to include the guide sleeve for being oriented to core assembly and two points of valve port seat being fixedly connected with lower valve body When body part, annular convex platform be can be set on valve port seat.

Citing is carried out to the manufacturing method of motor-driven valve and motor-driven valve provided herein above to introduce.It is used herein The principle and implementation of this application are described for specific case, and the above embodiments are only used to help understand The present processes and its core concept.It should be pointed out that for those skilled in the art, not departing from this Apply principle under the premise of, can also to the application, some improvement and modification can also be carried out, these improvement and modification also fall into the application In scope of protection of the claims.

Claims (9)

1. a kind of motor-driven valve, comprising:

Valve component, the valve component include valve core housing, and the valve core housing includes valve port portion；Screw component, the screw rod group Part includes screw rod and bearing, and the bearing holder (housing, cover) is set to the lower end of the screw rod, and the bearing includes outside bearing inner ring and bearing Ring, the bearing inner ring can be circumferentially rotated relative to the outer race；Core assembly, the core assembly is in the screw rod It under the drive of component, can be moved axially relative to the valve core housing, the core assembly includes spool, the spool at least portion Point be set to the inner cavity of the valve core housing, the outer wall of the spool can with the inner wall clearance sliding fit of the valve core housing, The spool includes holding tank；Elastic element, the elastic element are set to the holding tank, the upper end of the elastic element with The outer race abuts, and the lower end of the elastic element is abutted with the spool.

2. motor-driven valve according to claim 1, which is characterized in that the core assembly further includes sealing ring, the sealing Ring is made of flexible material, and the sealing ring can cooperate with the valve port portion to close the motor-driven valve, when the motor-driven valve When closing, the spool and the valve port portion radially have predetermined gap.

3. motor-driven valve according to claim 2, which is characterized in that the valve core housing includes the annular protruded axially upward Boss, for the annular convex platform as the valve port portion, the spool further includes flow control portion, and the flow control portion includes ring Connected in star portion and taper portion, the taper portion are set to the lower section of the annular groove section, and the seal ring set is set to the ring Connected in star portion, when the sealing ring is abutted with the valve port portion, the taper portion and the valve port portion are radially with predetermined Gap.

4. motor-driven valve according to claim 3, which is characterized in that the flow control portion further includes being set to the annular Annular protrusion between concave part and the taper portion, the annular protrusion is the constant cylinder of cross-sectional diameter, fixed The outer diameter of the justice annular protrusion is D1, and the outer diameter for defining the outer wall of the annular groove section is D2, defines the sealing ring Internal diameter be D3, then 0.15mm≤D1-D2≤0.25mm, and, 0≤D3-D2≤0.25mm.

5. motor-driven valve according to claim 2, which is characterized in that the valve core housing includes the annular protruded axially upward Boss, for the annular convex platform as the valve port portion, the spool further includes flow control portion, and the flow control portion includes column Shape portion and taper portion, the taper portion are set to the lower section of the columnar part, and the sealing ring is molded to be formed by injected plastics material, When the sealing ring is abutted with the valve port portion, the taper portion and the valve port portion radially have predetermined gap.

6. motor-driven valve according to claim 1-5, which is characterized in that the bearing is set to the holding tank, The bearing includes the bearing inner ring, the outer race, is set between the bearing inner ring and the outer race Ball, the outer race can be relative to the cell wall clearance sliding fits of the holding tank.

7. motor-driven valve according to claim 1-5, which is characterized in that the screw rod include be set to it is described under The periphery wall of main part above end, the lower end surface of the main part and the lower end forms step surface First directed downwardly Rank portion, the bearing are set to the holding tank, and the upper end of the bearing inner ring is abutted with the first step portion, the bearing The lower end of inner ring is fixed with the lower end riveting.

8. motor-driven valve according to claim 1-5, which is characterized in that the screw rod include be set to it is described under The periphery wall of main part above end, the lower end surface of the main part and the lower end forms step surface First directed downwardly Rank portion, the bearing are set to the holding tank, and the upper end of the bearing inner ring is abutted with the first step portion, the bearing The lower end of inner ring is fixed with the lower end by circlip.

9. motor-driven valve according to claim 1-5, which is characterized in that the core assembly further includes retaining ring, institute The upper end for stating spool includes the face-up second step portion of step, and the lower end surface of the retaining ring connects with the second step portion The upper end riveting of touching, the retaining ring and the spool cooperates, and the bearing is set to the holding tank, the upper end energy of the bearing Enough to cooperate with the retaining ring, the outer race can be relative to the cell wall clearance sliding fit of the holding tank.