CN203098902U

CN203098902U - Valve needle assembly and electronic expansion valve comprising same

Info

Publication number: CN203098902U
Application number: CN2013200085180U
Authority: CN
Inventors: 刘敬喜; 吕晓; 费谷丰
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2013-01-08
Filing date: 2013-01-08
Publication date: 2013-07-31
Anticipated expiration: 2023-01-08

Abstract

The utility model relates to a needle subassembly and including the electronic expansion valve of this needle subassembly. According to an aspect of the present invention, the valve needle assembly comprises: a first member (20, 20A, 20B) connected to or integrated with a transmission part of a drive mechanism, the first member receiving power from the drive mechanism so as to be movable up and down in an axial direction (A); and a second member (30, 30A, 30B) including a needle, the second member being detachably connected with the first member, the second member being movable up and down in the axial direction (a) with up and down movement of the first member so that the needle can be engaged with or disengaged from the valve seat. According to the utility model discloses, can realize adjusting the purpose of electronic expansion valve capacity through the needle of changing different specifications in single electronic expansion valve, enlarge electronic expansion valve's range of application and reinforcing commonality from this.

Description

Needle assembly and the electric expansion valve that comprises this needle assembly

Technical field

The electric expansion valve that the utility model relates to the needle assembly and comprises this needle assembly more specifically, relates to and has the needle assembly of improvements and the electric expansion valve that comprises this needle assembly at aspects such as assemblings.

Background technique

Electric expansion valve is the vitals in the cooling/heating system, is mainly used in the flow of refrigerant fluid is regulated.In traditional electric expansion valve, usually, needle adopts with transmission part fixedlys connected (for example interference crimping), and perhaps needle and transmission part are made one (for example being injection molded into one).Thus, needle can and be changed by the demand dismounting, perhaps can not dismantle and change by demand easily and freely.

Therefore, for electric expansion valve, desired is, the realization needle is freely changed (especially, need be) by any external tool, thereby in same electric expansion valve, realize different Flow-rate adjustment abilities, enlarge the application area of electric expansion valve thus and strengthen versatility by the needle of changing different size.

Here, the technology contents that should be pointed out that in this part is provided is intended to help those skilled in the art to understanding of the present utility model, and not necessarily constitutes prior art.

The model utility content

In this part, provide total summary of the present utility model, rather than the complete scope of the utility model or all features of the utility model is open comprehensively.

A purpose of the present utility model provide a kind of can be under need not be by the situation of any external tool in direct mode with hand easily and freely by the demand dismounting with change the needle assembly and/or the electric expansion valve of needle.

Another purpose of the present utility model provides and a kind ofly can be in single electric expansion valve realizes regulating the needle assembly and/or the electric expansion valve of the purpose of electronic expansion valve capacity by the needle of changing different size.

Another purpose of the present utility model provides a kind of needle assembly and/or electric expansion valve that can enlarge the application area of electric expansion valve and strengthen versatility.

According to an aspect of the present utility model, a kind of needle assembly is provided, comprise: first member, described first member is connected with the transmission part of driving mechanism or is integral with described transmission part, can in axial direction move up and down thereby described first member receives power from described driving mechanism; And second member, described second member comprises needle, described second member removably is connected with described first member, and described second member can in axial direction move up and down along with described first the moving up and down of member, makes needle to engage with valve seat or to separate.

In above-mentioned needle assembly, described first member has first joining portion, and described second member has second joining portion, and described first joining portion removably is connected with described second joining portion.

In above-mentioned needle assembly, described first joining portion is one in the profile portion and the collar, described second joining portion is another person in the collar and the profile portion, and the described collar has through hole, make when assembling described profile portion can pass described through hole from the first distolateral insertion of the described collar, rotate to the situation of predetermined circumferential angle under described profile portion by described collar backstop and can not in axial direction back mobile around axial direction but insert after passing described through hole in described profile portion.

In above-mentioned needle assembly, the radial cross section of described profile portion is non-circular, and described through hole is the non-circular through hole with described profile portion approximate match.

In above-mentioned needle assembly, described profile portion is roughly microscler tabular body, and have contact surface, two relative roughly straight sidepieces and the sidepiece of two relative circular arcs, and described through hole correspondingly is that radial cross section is roughly microscler through hole, and has two the relative roughly straight inner circle wall sections and the inner circle wall section of two relative circular arcs.

In above-mentioned needle assembly, the described collar is being provided with pockets with the described first distolateral second opposite distolateral place, and described pockets is used to hold described profile portion, makes described profile portion can not in axial direction back be moved by backstop.

In above-mentioned needle assembly, described pockets is the non-circular pockets with described profile portion approximate match.

In above-mentioned needle assembly, described pockets is that the radial cross section with described profile portion approximate match is roughly microscler pockets.

In above-mentioned needle assembly, described through hole is that the radial cross section with described profile portion approximate match is roughly microscler through hole, the longitudinal center line of described pockets roughly overlaps with the longitudinal center line of described through hole, and the skew mutually along the circumferential direction of the radially longitudinal axis of the radially longitudinal axis of described pockets and described through hole.

In above-mentioned needle assembly, the radially longitudinal axis of described pockets and the radially longitudinal axis of described through hole along the circumferential direction are offset 90 degree mutually.

In above-mentioned needle assembly, described needle assembly also comprises bias component, described bias component is arranged between described first member and described second member, so that along described first member of direction bias voltage and described second member that described first member and described second member are separated from each other.

In above-mentioned needle assembly, described first joining portion is arranged on the described profile portion of the lower end of described first member, described second joining portion is arranged on the described collar of the upper end of described second member, and the needle body that described second member also comprises cylindrical shell and is connected the lower end of described cylindrical shell, upper end at described cylindrical shell is provided with collar receiving cavity, and the described collar is contained in the described collar receiving cavity.

In above-mentioned needle assembly, the described collar is contained in the described collar receiving cavity with interference fit.

In above-mentioned needle assembly, in described cylindrical shell, be provided with the middle part receiving cavity, and described needle assembly also comprises bias component, and described bias component is contained in the receiving cavity of described middle part, thereby so that upwards the described profile portion of bias voltage makes described profile portion against the described collar.

In above-mentioned needle assembly, described needle assembly also comprises the pad that is arranged between described profile portion and the described bias component.

In above-mentioned needle assembly, described needle body is connected to and can in axial direction moves up and down with respect to described cylindrical shell, and described needle assembly also comprises the force transfer unit that is arranged between described bias component and the described needle body, described force transfer unit contacts with described needle body point, so as to realize needle with respect to valve seat from centering.

In above-mentioned needle assembly, described bias component is a helical spring.

In above-mentioned needle assembly, described first joining portion is arranged on the described collar of the lower end of described first member, described second joining portion is arranged on the described profile portion of the upper end of described second member, and described first member is a sleeve, lower end at described sleeve is provided with collar receiving cavity, and the described collar is contained in the described collar receiving cavity.

In above-mentioned needle assembly, in described sleeve, be provided with the middle part receiving cavity, and described needle assembly also comprises bias component, and described bias component is contained in the receiving cavity of described middle part, thereby so that the described profile portion of biased downward makes described profile portion against the described collar.

In above-mentioned needle assembly, described first joining portion is one in groove and abutting part and the lower end that is arranged on described first member, described second joining portion is another person in abutting part and the groove, and described needle assembly also comprises intermediate member, and described first joining portion removably is connected by described intermediate member with described second joining portion.

In above-mentioned needle assembly, described intermediate member is a circlip, described circlip removably is arranged in the described groove, thus make the part of described circlip be embedded in the described groove and another part of described circlip protrude from described groove can the described abutting part of backstop.

In above-mentioned needle assembly, described circlip comprises the main body portion that is general toroidal and from the extended grasping part of described main body portion.

In above-mentioned needle assembly, described first member is a sleeve, described first joining portion is arranged on the described groove at inner circle wall place of the lower end of described sleeve, described second joining portion is arranged on the described abutting part at the described second member place, and described grasping part is set to a pair of, and roughly radially extends internally and then in axial direction extend from the end of described main body portion respectively.

In above-mentioned needle assembly, described first member is a sleeve, described first joining portion is arranged on the described abutting part of the lower end of described sleeve, described second joining portion is arranged on the described groove at the described second member place, and described grasping part is set to a pair of, and roughly radially stretches out and then in axial direction extend from the end of described main body portion respectively.

In above-mentioned needle assembly, described needle assembly also comprises grommet, described grommet is arranged between described circlip and the described abutting part, the part of described grommet can with another part of described circlip butt and described grommet can with described abutting part butt.

In above-mentioned needle assembly, described abutting part is the flange that radially outwards protrudes or radially to projecting inward flange.

According on the other hand of the present utility model, a kind of electric expansion valve is provided, comprising: driving mechanism; Valve seat; And aforesaid needle assembly.

In above-mentioned electric expansion valve, described driving mechanism is the electromagnetic type driving mechanism, and described electromagnetic type driving mechanism comprises electromagnetic coil and the plunger that is used as described transmission part.

In above-mentioned electric expansion valve, described driving mechanism is the electrodynamic type driving mechanism, and described electrodynamic type driving mechanism comprises motor and axle, and described axle is configured to rotate integratedly with the rotor of described motor, and described axle is as described transmission part.

In above-mentioned electric expansion valve, described first member is permanently connected with described axle or is threaded with the screw thread kind of drive.

In above-mentioned electric expansion valve, described first member is a sleeve, and described sleeve is provided with anti-rotation structure in the periphery, and is provided with internal thread part in described sleeve, and described internal thread part is threaded with the male end of described axle.

According to the utility model, can be under need not situation by any external tool, directly to press the demand dismounting easily and freely and to change needle with the mode of hand, thereby the purpose that can realize regulating the electronic expansion valve capacity by the needle of changing different size in single electric expansion valve enlarges the application area of electric expansion valve thus and strengthens versatility.

Description of drawings

By following detailed description with reference to accompanying drawing, it is easier to understand that feature and advantage of the present utility model will become, in the accompanying drawings:

Fig. 1 is the longitudinal section according to the needle assembly of the utility model first mode of execution;

Fig. 2 A-2H is the stereogram according to each included parts of the needle assembly of the utility model first mode of execution;

Fig. 3 is the longitudinal section according to the needle assembly of the utility model second mode of execution;

Fig. 4 A-4D is the stereogram according to each included parts of the needle assembly of the utility model second mode of execution;

Fig. 5 is the longitudinal section according to the needle assembly of the utility model the 3rd mode of execution;

Fig. 6 A-6E is the stereogram according to each included parts of the needle assembly of the utility model the 3rd mode of execution;

Fig. 7 illustrates use according to hole of the present utility model stereogram with the assembly body of the axle of back-up ring and moving iron;

Fig. 8 illustrates use according to hole of the present utility model longitudinal section with the assembly body of the axle of back-up ring and moving iron;

Fig. 9 A-9C is the stereogram of each included parts of the assembly body of axle and moving iron;

Figure 10 illustrates use according to hole of the present utility model stereogram with the assembly body of the sleeve of back-up ring and needle;

Figure 11 illustrates the stereogram of use according to the assembly body of the axle of shaft block ring of the present utility model and axle bush;

Figure 12 illustrates the longitudinal section of use according to the assembly body of the axle of shaft block ring of the present utility model and axle bush;

Figure 13 A-13C is the stereogram of each included parts of the assembly body of axle and axle bush; And

Figure 14 is the stereogram that the back-up ring in the correlation technique is shown.

Embodiment

The utility model is described in detail with reference to the accompanying drawings, by illustrative embodiments.To following detailed description of the present utility model only is for serve exemplary purposes, and never is the restriction to the utility model and application or purposes.

At first, the A-2H that sees figures.1.and.2 describes needle assembly 10 according to the utility model first mode of execution.Wherein, Fig. 1 is the longitudinal section according to the needle assembly of the utility model first mode of execution, and Fig. 2 A-2H is the stereogram according to each included parts of the needle assembly of the utility model first mode of execution.

As shown in Figure 1, needle assembly 10 can comprise sleeve 20 and needle 30.Sleeve 20 generally comprises: first/top section (internal thread part/anti-rotation portion) 22; And second/compresses lower section (needle joining portion) 24.Form in first section 22 of sleeve 20 porose (for example through hole), this hole has round-shaped, and is formed with internal thread in this hole.In addition, the periphery of first section 22 of sleeve 20 has anti-rotation structure (for example non-circular or polyhedron periphery is preferably the octahedra periphery shown in Fig. 2 E).First section 22 of sleeve 20 is used for the corresponding part of driving mechanism (not shown, lower end/the male end of the axle that for example driving mechanism and rotor revolution motor rotate integratedly) is threaded, receiving power from driving mechanism, thus can be at the situation lower edge axial direction A upper and lower translation of the axle rotation of driving mechanism.Second section 24 of sleeve 20 is used for engaging with needle 30, make needle 30 can be along with moving up and down of sleeve 20 in axial direction A move up and down.Here, it is pointed out that in the first embodiment that sleeve 20 is used as according to first member of the present utility model.

Here, it should be noted that driving mechanism can also be the electromagnetic type driving mechanism that comprises electromagnetic coil and movable plunger except being to comprise the electrodynamic type driving mechanism of revolution motor (for example stepper motor) and axle according to the utility model.Under the situation of using the electromagnetic type driving mechanism, first member (sleeve 20) can be permanently connected with the corresponding part (for example lower end of movable plunger) of driving mechanism, perhaps even can form as one with the corresponding part of driving mechanism (for example integrally molded).Thus, under the situation of using the electromagnetic type driving mechanism, locate internal thread part and/or anti-rotation portion can be set at first member (sleeve 20), and first member (sleeve 20) also can be other the suitable shape except general cylindrical shape on the whole.

Here, it is also to be noted that, according to the utility model, under the situation of using the electrodynamic type driving mechanism, first member (sleeve 20) also can be permanently connected with the corresponding part (for example lower end of axle) of driving mechanism, perhaps even can form as one with the corresponding part of driving mechanism (for example integrally molded).Thus, under the situation of using the electrodynamic type driving mechanism, locate also internal thread part and/or anti-rotation portion not to be set at first member (sleeve 20), and first member (sleeve 20) also can be other the suitable shape except general cylindrical shape on the whole.

The profile portion (positive joining portion) 242 that second section 24 of sleeve 20 can comprise main body portion 241 and be arranged on the lower end of second section 24.In preferred example, profile portion 242 is that radial cross section (that is, the radial direction B along direction A perpendicular to axial direction dissects the cross section that is obtained) is non-circular profile portion.In preferred example, profile portion 242 is roughly microscler tabular body, and has following contact surface 2421(for example for smooth contact surface), the sidepiece 2423 of relative two roughly straight sidepieces 2422 and relative two circular arcs.Main body portion 241 can be general cylindrical shape.The length radially of profile portion 242 (promptly, roughly corresponding to the distance between the sidepiece 2423 of two circular arcs) greater than the external diameter of main body portion 241, and the width radially of profile portion 242 (that is, roughly corresponding to the distance between the roughly straight sidepiece 2422) can be greater than (for example slightly greater than), be equal to or less than the external diameter of (for example slightly less than) main body portion 241.In illustrated example, the axial central part of profile portion 242 is a hollow, yet the axial central part that it is pointed out that profile portion 242 also can be solid, that is following contact surface 2421 is totally continuous contact surfaces.Here, it is pointed out that in the first embodiment that profile portion (positive joining portion) 242 is used as according to first joining portion of the present utility model.

Needle 30 generally comprises: the collar (cloudy joining portion) 32, cylindrical shell 34 and needle body 36.Here, it is pointed out that in the first embodiment that needle 30 is used as according to second member of the present utility model.

Locating to be provided with top receiving cavity 341(at first end (upper end) of cylindrical shell 34 is used as according to collar receiving cavity of the present utility model), the collar 32 is arranged in the top receiving cavity 341.In preferred example, the collar 32 is fixedly connected to cylindrical shell 34 by being interference fitted in the top receiving cavity 341.Axial center at cylindrical shell 34 is provided with middle part receiving cavity 342, and middle part receiving cavity 342 is used to hold the component such as helical spring that hereinafter will do description.In preferred example, at the inner circle wall place of cylindrical shell 34, be provided with stepped part 343 between top receiving cavity 341 and middle part receiving cavity 342, stepped part 343 helps the stable position of the collar 32 with respect to cylindrical shell 34.Second end (lower end) at cylindrical shell 34 is located, and maintains needle body 36.In preferred example, the lower end of cylindrical shell 34 be provided with general toroidal to the flange 344 that protrudes, needle body 36 remains in cylindrical shell 34 by flange 344.

The collar 32 has through hole 321, and profile portion 242 can be inserted and pass through hole 321 but can not rotate or can not fully rotate (that is, can not 360 degree ground rotations) in through hole 321.In other words, only under predetermined circumferential angle, profile portion 242 can be inserted and pass through hole 321, that is, under the situation of rotation at a certain angle, profile portion can not in axial direction be made progress by the collar 32 backstops back to insert and pass through hole 321 after the in axial direction downward insertion of profile portion 242 passes through hole 321.In preferred example, with profile portion 242 approximate match ground, through hole 321 is that radial cross section is non-circular through hole, make that profile portion 242 is guiding clearance matching relationship (in other words, profile portion 242 can not be rotated basically or radially be moved) with through hole 321 when through hole 321 is passed in profile portion 242 insertions.In preferred example, with the profile portion 242 approximate match ground that is microscler tabular body roughly, through hole 321 correspondingly is that radial cross section is roughly microscler through hole, and has the inner circle wall section 3213 of relative two roughly straight inner circle wall sections 3212 and relative two circular arcs.

In one example, the collar 32 locates to have pockets 322 at second end (lower end among Fig. 1), pockets 322 is used to hold profile portion 242, make profile portion 242 can not in axial direction be moved up by backstop, that end that is begun to insert by profile portion 242 of this second end and the collar 32 (first end, i.e. upper end among Fig. 1) is opposite.Preferably, pockets 322 is that the radial cross section with profile portion 242 approximate match is non-circular pockets, make that profile portion 242 is relations (in other words, profile portion 242 can not be rotated basically or radially be moved) of little Spielpassung with pockets 322 when profile portion 242 is contained in the pockets 322.More preferably, with the profile portion 242 approximate match ground that is microscler tabular body roughly, pockets 322 is that radial cross section is roughly microscler pockets.According to the utility model, owing to adopt be roughly profile portion, the radial cross section of microscler tabular body of approximate match to be roughly microscler through hole and radial cross section and to be roughly microscler pockets, can make the assembling and the dismounting of needle assembly more smooth, and after assembling, profile portion stably is contained in the pockets, more stable thereby first member that makes the needle assembly and second member detachable is connected.

Here, it is pointed out that in the first embodiment that the collar (cloudy joining portion) 32 is used as according to second joining portion of the present utility model.

The longitudinal center line of pockets 322 can roughly overlap with the longitudinal center line of through hole 321.Be that radial cross section is roughly microscler through hole and pockets 322 is radial cross sections is under the situation of roughly microscler pockets at through hole 321, the radially longitudinal axis B2 of the radially longitudinal axis B1 of pockets 322 and through hole 321 is skew mutually along the circumferential direction, is preferably mutual skew 90 degree.

In illustrated example, needle body 36 comprises: needle core 361, Sealing 362 and reinforcer 363.Needle body 36 can be retained at the lower end of cylindrical shell 34 and can in axial direction move up and down with respect to cylindrical shell 34.Yet, it should be noted that needle body 36 also can be fixedly connected to the lower end of cylindrical shell 34.

Needle assembly 10 can also comprise that helical spring 40(is used as according to bias component of the present utility model).Helical spring 40 is contained in the middle part receiving cavity 342 of cylindrical shell 34.Helical spring 40 to upper offset, makes profile portion 242 for example be pressed against in the pockets 322 profile portion 242 of sleeve 20 and then entire sleeve 20.In addition, under the situation that needle body 36 and cylindrical shell 34 are connected in the mode that can relative to each other in axial direction move, helical spring 40 is also with needle body 36 biased downward.Here, it should be noted that and to use other suitable elastic element to replace helical spring 40 to constitute bias component.

In preferred example, between profile portion 242 and helical spring 40, be provided with pad 50.Pad 50 helps helical spring 40 profile portion 242 of setovering more reposefully.

Be retained under the situation that can in axial direction move up and down at the lower end of needle body 36, can between helical spring 40 and needle body 36, force transfer unit 60 be set with respect to cylindrical shell 34 at cylindrical shell 34.Force transfer unit 60 and needle body 36(be the reinforcer 363 of needle body 36 for example) some contact, thereby realization needle body 36(is specially the needle core 361 of needle body 36) with respect to valve seat (not shown) from centering.In illustrated example, force transfer unit 60 comprises ball seat 62 and spheroid 64.Ball seat 62 is used to keep spheroid 64, and spheroid 64 is used for carrying out contacting with needle body 36.

Example assembled and unloading process according to the needle assembly 10 of the utility model first mode of execution are described below.When assembling, make needle 30 rotate to suitable circumferential angle (promptly with respect to the sleeve 20 that for example has been connected with the corresponding part of driving mechanism, the through hole 321 of the collar 32 of needle 30 is in axial direction alignd) with the profile portion 242 of second section 24 of sleeve 20, then through hole 321 is enclosed within on the profile portion 242, make profile portion 242 insert and pass through hole 321, insert until profile portion 242 and pass through hole 321.Then, make needle 30, make the pockets 322 of the collar 32 of needle 30 in axial direction align with profile portion 242 together with the collar 32 rotation 90 degree for example.Then, for example under the effect of the elastic force of helical spring 40, profile portion 242 is pressed against in the pockets 322, finishes assembling thus.When dismounting, together with upwards pushing of the collar 32, make profile portion 242 leave pockets 322 needle 30.Then, make needle 30, make the through hole 321 of the collar 32 of needle 30 in axial direction align with profile portion 242 together with the collar 32 rotation 90 degree for example.Then, pull out needle 30 downwards, finish dismounting thus.Here, it should be noted that, even if, also can suitably realize the assembling and the dismounting of needle assembly 10, and can make needle assembly 10 suitably operation in the working procedure of electric expansion valve not being provided with under the situation of the bias component of helical spring 40 for example.

According to the utility model first mode of execution, can be under need not situation by any external tool, directly to press the demand dismounting easily and freely and to change needle with the mode of hand, thereby the purpose that can realize regulating the electronic expansion valve capacity by the needle of changing different size in single electric expansion valve enlarges the application area of electric expansion valve thus and strengthens versatility.

Below, with reference to Fig. 3 and Fig. 4 A-4D needle assembly 10A according to the utility model second mode of execution is described.Wherein, Fig. 3 is the longitudinal section according to the needle assembly of the utility model second mode of execution, and Fig. 4 A-4D is the stereogram according to each included parts of the needle assembly of the utility model second mode of execution.

For for simplicity, the difference of second mode of execution and first mode of execution will be described mainly below.

As shown in Figure 3, needle assembly 10A can comprise sleeve 20A and needle 30A.Sleeve 20A generally comprises: first/top section (internal thread part/anti-rotation portion) 22A; Second/compresses lower section (needle joining portion) 24A; And the collar (cloudy joining portion) 26A.Form in the first section 22A of sleeve 20A porose (for example through hole), this hole has round-shaped, and is formed with internal thread in this hole.In addition, the periphery of the first section 22A of sleeve 20A has anti-rotation structure (for example non-circular or polyhedron periphery is preferably the octahedra periphery shown in Fig. 4 A).The first section 22A of sleeve 20A is used for the corresponding part of driving mechanism (not shown, lower end/the male end of the axle that for example driving mechanism and rotor revolution motor rotate integratedly) is threaded, receiving power from driving mechanism, thus can be at the situation lower edge axial direction A upper and lower translation of the axle rotation of driving mechanism.The second section 24A of sleeve 20A is used for engaging with needle 30A, make needle 30A can be along with moving up and down of sleeve 20A in axial direction A move up and down.Here, it is pointed out that in second mode of execution that sleeve 20A is used as according to first member of the present utility model.

Be provided with bottom receiving cavity 28A(as according to collar receiving cavity of the present utility model at the lower end of the second section 24A), collar 26A is arranged among the receiving cavity 28A of bottom.In preferred example, collar 26A is fixedly connected to the second section 24A by being interference fitted among the receiving cavity 28A of bottom.Axial center at sleeve 20A is provided with middle part receiving cavity 29A, and middle part receiving cavity 29A for example is used to hold the helical spring that hereinafter will do description.In preferred example, at the inner circle wall place of sleeve 20A, be provided with stepped part 243A between bottom receiving cavity 28A and middle part receiving cavity 29A, stepped part 243A helps collar 26A and is specially the second section 24A with respect to sleeve 20A() stable position.In preferred example, be provided with stepped part 223A at the inner circle wall place of the first section 22A of sleeve 20A, stepped part 223A is used to support the helical spring that hereinafter will do description.

The structure of collar 26A is similar to the collar 32 in first mode of execution.Collar 26A has through hole 261A.In preferred example, through hole 261A is that radial cross section is non-circular through hole.In preferred example, through hole 261A is that radial cross section is roughly microscler through hole, and has the inner circle wall section 2613A of relative two roughly straight inner circle wall section 2612A and relative two circular arcs.In one example, collar 26A locates to have pockets 262A at first end (upper end among Fig. 3), and pockets 262A is used to hold the profile portion of the needle 30A that hereinafter will do description.Preferably, pockets 262A is that radial cross section is non-circular pockets.More preferably, pockets 262A is that radial cross section is roughly microscler pockets.Here, it is pointed out that in second mode of execution that the collar (cloudy joining portion) 26A is used as according to first joining portion of the present utility model.

Needle 30A generally comprises needle body 36A.Here, it is pointed out that in second mode of execution that needle 30A is used as according to second member of the present utility model.

Upper end at needle body 36A is provided with profile portion (positive joining portion) 365A.The structure of profile portion 365A is similar to the profile portion 242 in first mode of execution.In preferred example, profile portion 365A is that radial cross section is non-circular profile portion.In preferred example, profile portion 365A is roughly microscler tabular body, and has last contact surface 3651A(for example for smooth contact surface), the sidepiece 3653A of relative two roughly straight sidepiece 3652A and relative two circular arcs.The length radially of profile portion 365A (promptly, roughly corresponding to the distance between the sidepiece 3653A of two circular arcs) greater than the external diameter of the upper end portion of needle body 36A, and the width radially of profile portion 365A (that is, roughly corresponding to the distance between the roughly straight sidepiece 3652A) can be greater than (for example slightly greater than), be equal to or less than the external diameter of the upper end portion of (for example slightly less than) needle body 36A.Here, it is pointed out that in second mode of execution that profile portion (positive joining portion) 365A is used as according to second joining portion of the present utility model.

Needle assembly 10A can also comprise that helical spring 40A(is used as according to bias component of the present utility model).Helical spring 40A is contained among the middle part receiving cavity 29A of sleeve 20A.

Assembling according to the needle assembly 10A of the utility model second mode of execution is similar basically with unloading process to needle assembly 10 assemblings according to the utility model first mode of execution with unloading process.

According to the utility model second mode of execution, similarly, can be under need not situation by any external tool, directly to press the demand dismounting easily and freely and to change needle with the mode of hand, thereby the purpose that can realize regulating the electronic expansion valve capacity by the needle of changing different size in single electric expansion valve enlarges the application area of electric expansion valve thus and strengthens versatility.

Below, with reference to Fig. 5 and Fig. 6 A-6E needle assembly 10B according to the utility model the 3rd mode of execution is described.Wherein, Fig. 5 is the longitudinal section according to the needle assembly of the utility model the 3rd mode of execution, and Fig. 6 A-6E is the stereogram according to each included parts of the needle assembly of the utility model the 3rd mode of execution.

For for simplicity, the difference of the 3rd mode of execution and first and second mode of executions will be described mainly below.

As shown in Figure 5, needle assembly 10B can comprise sleeve 20B and needle 30B.Sleeve 20B generally comprises: first/top section (internal thread part/anti-rotation portion) 22B; And second/compresses lower section (needle joining portion) 24B.Form in the first section 22B of sleeve 20B porose (for example through hole), this hole has round-shaped, and is formed with internal thread in this hole.In addition, the periphery of the first section 22B of sleeve 20B has anti-rotation structure (for example non-circular or polyhedron periphery is preferably octahedra periphery).The first section 22B of sleeve 20B is used for the corresponding part of driving mechanism (not shown, lower end/the male end of the axle that for example driving mechanism and rotor revolution motor rotate integratedly) is threaded, receiving power from driving mechanism, thus can be at the situation lower edge axial direction A upper and lower translation of the axle rotation of driving mechanism.The second section 24B of sleeve 20B is used for engaging with needle 30B, make needle 30B can be along with moving up and down of sleeve 20B in axial direction A move up and down.Here, it is pointed out that in the 3rd mode of execution that sleeve 20B is used as according to first member of the present utility model.

Lower end at the second section 24B is provided with bottom receiving cavity 28B, and the part of needle 30A is arranged among the receiving cavity 28B of bottom.Axial center at sleeve 20B is provided with middle part receiving cavity 29B, and middle part receiving cavity 29B for example is used to hold the helical spring that hereinafter will do description.In preferred example, be provided with stepped part 25B at the inner circle wall place of sleeve 20B, stepped part 25B is used to support the helical spring that hereinafter will do description.

Inner circle wall place in the lower end of the second section 24B is provided with groove 27B, and groove 27B is used to hold the back-up ring that hereinafter will do description.Here, it is pointed out that in the 3rd mode of execution that groove 27B is used as according to first joining portion of the present utility model.

Needle 30B generally comprises: needle core 361B, Sealing 362B and reinforcer 363B.Here, it is pointed out that in the 3rd mode of execution that needle 30B is used as according to second member of the present utility model.

In illustrated example, be formed with the flange 3621B(that radially outwards protrudes at Sealing 362B place and be used as) according to abutting part of the present utility model.Here, it should be noted that for example other parts/part of needle 30B also can be used for the back-up ring butt that hereinafter will do description with formation according to abutting part of the present utility model except radially outwards or to projecting inward flange.Correspondingly, be formed with the flange 3631B that radially outwards protrudes at reinforcer 363B place.Flange 3621B(or flange 3621B are with flange 3631B) be used for and hereinafter will do the back-up ring butt of description or be supported back-up ring indirectly with the grommet butt.Here, it is pointed out that in the 3rd mode of execution that flange 3621B(or flange 3621B are with flange 3631B) be used as according to second joining portion of the present utility model.

Here, it should be noted that in the 3rd mode of execution that needle also can be any other suitable type, for example needle in the 3rd mode of execution.In this case, the flange that is used as second joining portion can be the sidepiece 2423 of the circular arc of the profile portion 365A described in second mode of execution, perhaps can be any other the suitable flange that radially outwards protrudes from needle body 36A.

Needle assembly 10B comprises that back-up ring 90B(is used as according to intermediate member of the present utility model).According to the 3rd mode of execution, sleeve 20B(first member) groove 27B(first joining portion) with needle 30B(second member) flange 3621B(second joining portion) removably be connected by back-up ring 90B.Back-up ring 90B can comprise main body portion 901B that is general toroidal and the grasping part 902B that protrudes from main body portion 901B.Back-up ring 90B may be embodied as elastic member.Particularly, thus at least the main body portion 901B of back-up ring 90B have elasticity can resiliently deformable.Back-up ring 90B removably is arranged among the groove 27B, make the main body portion 901B part of back-up ring 90B be embedded among the groove 27B, another part of the main body portion 901B of back-up ring 90B then protrudes with respect to groove 27B, thereby can be directly or flange 3621B and then the whole needle 30B of backstop of backstop needle 30B indirectly.

In preferred example, grasping part 902B forms a pair of, and from the main body portion 901B of back-up ring 90B roughly radially to projecting inward (for example protruding slightly) and then in axial direction protrude.Because so structure can avoid grasping part and other parts to interfere mutually, the while also spatially guarantees to touch easily the grasping part.By this a pair of grasping part 902B of cramping, thereby can make main body portion 901B resiliently deformable that the diameter of the ring body of the main body portion 901B that is general toroidal is diminished for example easily to break away from from groove 27B.

In preferred example, back-up ring 90B is configured to: at back-up ring 90B in the raw down, the diameter of the ring body of the main body portion 901B of back-up ring 90B is suitably greater than the diameter of the ring body (that is the formed imaginary ring body of groove 27B) of (be preferably slightly greater than) groove 27B.Like this, under the main body portion 901B of back-up ring 90B is contained in state among the groove 27B, the main body portion 901B of back-up ring 90B can to groove 27B radially outward direction apply suitable elastic force, make the main body portion 901B of back-up ring 90B more stably be contained among the groove 27B thus, and then make needle 30B more stably be assemblied among the sleeve 20B.

In preferred example, needle assembly 10B comprises that also grommet 95B(is used as according to additional intermediate member of the present utility model).Grommet 95B can be in the little Spielpassung of the second section 24B of the outside and sleeve 20B, and grommet 95B can be in the inboard with the mode of little Spielpassung appropriate section (this appropriate section is positioned at flange 3621B below) around needle 30B.Grommet 95B is used to be arranged between the flange 3621B of the main body portion 901B of back-up ring 90B and needle 30B, thus the part of grommet 95B (for example inside upper part) and the part (for example outer lower portion) of flange 3621B butt and grommet 95B and the main body portion 901B butt of back-up ring 90B.By grommet 95B is set, on the one hand,, the higher needle 30B of cost can avoid needle 30B wearing and tearing and damage because directly not contacting with back-up ring 90B, on the other hand, can improve the stable position of needle 30B in sleeve 20B.

Needle assembly 10B can also comprise that helical spring 40B(is used as according to bias component of the present utility model).Helical spring 40B is contained among the middle part receiving cavity 29B of sleeve 20B.Helical spring 40B is supported by stepped part 25B, and with needle 30B biased downward.

Example assembled and unloading process according to the needle assembly 10B of the utility model the 3rd mode of execution are described below.When assembling, needle 30B is inserted among the bottom receiving cavity 28B of sleeve 20B.Then, under the situation that is provided with grommet 95B, grommet 95B is inserted among the bottom receiving cavity 28B of sleeve 20B, grommet 95B is in the little Spielpassung of the second section 24B of the outside and sleeve 20B and center on the appropriate section of needle 30B in the inboard thus.Then, the grasping part 902B of cramping back-up ring 90B, the main body portion 901B with back-up ring 90B under the state that diminishes with the diameter at the ring body of main body portion 901B is embedded among the groove 27B.At this moment, the part of protruding with respect to groove 27B of main body portion 901B and the flange 3621B butt of needle 30B or with grommet 95B butt via grommet 95B support lug 3621B indirectly, finish assembling thus.In when dismounting, directly use hand cramping grasping part 902B, under the state that diminishes with diameter back-up ring 90B is pulled down from groove 27B at the ring body of main body portion 901B.Then, needle 30B is pulled down from sleeve 20B, finish dismounting thus.Under the situation that is provided with helical spring 40B, in the time of in the bottom receiving cavity 28B that needle 30B is inserted sleeve 20B, need head on the elastic force pushing needle 30B of helical spring 40B, and after assembling was finished, needle 30B bore the downward elastic force of helical spring 40B.Like this, needle 30B can be more stable with respect to the assembling of sleeve 20B.Then, it should be noted that, even if, also can suitably realize assembling and the dismounting of needle assembly 10B, and can make needle assembly 10B suitably operation in the working procedure of electric expansion valve not being provided with under the situation of the bias component of helical spring 40 for example.

Here, it should be noted that and in the 3rd mode of execution, can allow following modification.That is groove (radially outwardly open groove) can be formed on the periphery of needle 30B, and flange (radially to projecting inward flange) can be formed on the inner circle wall place of lower end of the second section 24B of sleeve 20B.In this modification, back-up ring can be configured to: at back-up ring in the raw down, the diameter of the ring body of the main body portion of back-up ring is suitably less than the diameter of the ring body (that is the formed imaginary ring body of groove) of (be preferably slightly less than) groove.Like this, under the main body portion of back-up ring is contained in state in the groove, the back-up ring main body portion can to groove radially inward direction apply suitable elastic force, make the back-up ring main body portion more stably be contained in the groove thus, and then make needle more stably be assemblied in the sleeve.In this modification, the grasping part can form a pair of, and roughly radially outwards protrudes (for example protruding slightly) and then in axial direction protrude from the main body portion of back-up ring.By strutting this a pair of grasping part, thereby can make the main body portion resiliently deformable that the diameter of the ring body of the main body portion that is general toroidal is become greatly for example easily to break away from from groove.According to this modification, can realize freely dismantling and changing of needle assembly equally.

According to the utility model the 3rd mode of execution and modification thereof, similarly, can be under need not situation by any external tool, directly to press the demand dismounting easily and freely and to change needle with the mode of hand, thereby the purpose that can realize regulating the electronic expansion valve capacity by the needle of changing different size in single electric expansion valve enlarges the application area of electric expansion valve thus and strengthens versatility.

And in the 3rd mode of execution, back-up ring is so-called nonstandard or self-control or the special-shaped back-up ring of for example being made by steel wire.Therefore, realize that with being used to equally in the correlation technique " screw thread the adds shoulder " scheme that axially is connected compares, according to dismountable (flexibility or rigidity) of the utility model the 3rd mode of execution axially linkage structure can eliminate under the vibration environment become flexible, shortcomings such as reliability is not high, cost is high, narrow application range.On the other hand, " standard back-up ring (referring to Figure 14; Figure 14 is the stereogram that the back-up ring in the correlation technique the is shown) " scheme that prevents axial motion with being used to equally in the correlation technique is compared, according to the dismountable axial linkage structure of the utility model the 3rd mode of execution can: under the smaller situation of for example radial space, use, the existing certain axial nominal clearance amount of " standard back-up ring " scheme of can eliminating or reduce, thereby when assembling and dismounting, need not to use special tool assembling and dismounting simpler, versatility is improved, itself is simple in structure, and relevant cost is reduced.Especially, according to the back-up ring (the nonstandard back-up ring in hole) of the utility model the 3rd mode of execution and according to the back-up ring (the nonstandard back-up ring of axle) of its modification, owing to can carry out nonstandard design by demand as the case may be, therefore can design various nonstandard back-up rings satisfies practical set and spatial requirement, thereby versatility is strengthened widely.

According to other aspect of the present utility model, a kind of electric expansion valve is provided, this electric expansion valve can comprise driving mechanism, valve seat and aforesaid needle assembly.In this electric expansion valve, first member (sleeve) of needle assembly can be connected with the corresponding part of driving mechanism, receiving power from driving mechanism, thereby in axial direction moves up and down.In addition, second member (needle) that removably is connected with first member of needle assembly thus can in axial direction move up and down the flow of regulating the refrigerant fluid that flows through electric expansion valve along with second the moving up and down of member, thereby and can engage with valve seat and close electric expansion valve.

Below, further describe according to back-up ring of the present utility model and application thereof with reference to Fig. 5 and Fig. 6 A-6E of Fig. 7, Fig. 8, Fig. 9 A-9C and Figure 10 and front.Wherein, Fig. 7 illustrates use according to hole of the present utility model stereogram with the assembly body of the axle of back-up ring and moving iron, Fig. 8 illustrates use according to hole of the present utility model longitudinal section with the assembly body of the axle of back-up ring and moving iron, Fig. 9 A-9C is the stereogram of each included parts of the assembly body of axle and moving iron, and Figure 10 illustrates use according to hole of the present utility model stereogram with the assembly body of the sleeve of back-up ring and needle.

As shown in the figure, back-up ring 90B can be used for removably connecting axle 70B(as according to male connector on the other hand of the present utility model) and moving iron 80B(be used as according to cloudy link on the other hand of the present utility model).Particularly, the upper end of axle 70B be provided with flange (as according to abutting part of the present utility model) or with the upper end of axle 70B for example the axle bush 72B(that is connected of axial restraint ground be used as according to abutting part of the present utility model).In addition, the lower end at moving iron 80B is provided with bottom receiving cavity 82B, the upper end that is used to hold axle 70B.Inner circle wall place in the lower end is provided with groove 84B.Thus, by the flange of back-up ring 90B, axle 70B or be arranged at the axle bush 72B of axle 70B and the groove 84B of moving iron 80B has constituted according to axial stop bit of the present utility model mechanism.In one example, at the inner circle wall place of the lower end of moving iron 80B, above groove 84B, be provided with stepped part 86B, stepped part 86B is used for the flange of axle 70B or is arranged at the axle bush 72B butt of axle 70B, makes axle 70B and moving iron 80B more stably assemble or can limit axle 70B thus and moving iron 80B descends relatively moving on the twocouese in the axial direction.

In addition, as shown in figure 10 and as mentioned described with reference to Fig. 5 etc., back-up ring 50B can be used for removably coupling sleeve 20B(as according to cloudy link on the other hand of the present utility model) and needle 30B(be used as according to male connector on the other hand of the present utility model).Thus, constituted according to another axial stop bit mechanism of the present utility model by the flange 3621B of the groove 27B of back-up ring 50B, sleeve 20B and needle 30B.

Below, further describe according to back-up ring of the present utility model (hole back-up ring) and application thereof with reference to Figure 11, Figure 12 and Figure 13 A-13C.Wherein, Figure 11 illustrates the stereogram of use according to the assembly body of the axle of shaft block ring of the present utility model and axle bush, Figure 12 illustrates the longitudinal section of use according to the assembly body of the axle of shaft block ring of the present utility model and axle bush, and the stereogram of Figure 13 A-13C each parts that to be the assembly body of axle and axle bush included.

As shown in the figure, shaft block ring 90C can be used for removably connecting axle 70C(as according to male connector on the other hand of the present utility model) and axle bush 72C(be used as according to cloudy link on the other hand of the present utility model).Particularly, be provided with groove 74C in the periphery of the upper end of axle 70C.Thus, constituted according to another axial stop bit mechanism of the present utility model by the groove 74C of back-up ring 90C, axle 70C and axle bush 72C.In one example, in the periphery of the upper end of moving iron 70C, below groove 74C, be provided with stepped part 76C, stepped part 76C is used for the butt with axle bush 72C, axle 70C and axle bush 72C are more stably assembled or can limit axle 70C and axle bush 72C descends relatively moving on the twocouese in the axial direction.

Shown in Figure 13 B, back-up ring 90C can comprise 901C of elastic body portion and a pair of grasping part 902C that is general toroidal, and each grasping part 902C extends from the associated end of elastic body portion respectively.In preferred example, grasping part 902C roughly radially stretches out and then extension in axial direction from the end of the 901C of elastic body portion.Because so structure can avoid grasping part and other parts to interfere mutually, the while also spatially guarantees to touch easily the grasping part.

According to other aspect of the present utility model, a kind of electric expansion valve is provided, this electric expansion valve can comprise aforesaid one or more back-up ring or one or more axial stop bit mechanism.

In present specification, directional terminology " on ", the use of D score, " top " and " below " etc. is only for being convenient to purpose of description, and should not to be considered as be restrictive.

In a word, although described the utility model in the literary composition in detail, be to be understood that the utility model is not limited to embodiment/example/modification of describing in detail and illustrate in the literary composition.Under the situation that does not depart from essence of the present utility model and scope, can realize further modification and variant by those skilled in the art.All these modification and variant all fall in the scope of the present utility model.In addition, member/parts of being equal on can be by other technical of all member/parts described here replace.

Claims

A needle assembly (10,10A 10B), is characterized in that comprising:

First member (20,20A, 20B), described first member is connected with the transmission part of driving mechanism or is integral with described transmission part, thus described first member from described driving mechanism receive power in axial direction (A) move up and down; And

Second member (30,30A, 30B), described second member comprises needle, described second member removably is connected with described first member, described second member can be along with described first the moving up and down of member in axial direction (A) move up and down, make needle to engage with valve seat or separate.
Needle assembly 2. according to claim 1 (10,10A, 10B), wherein, and described first member (20,20A, 20B) have first joining portion (242,26A, 27B), described second member (30,30A, 30B) have second joining portion (32,365A, 3621B), described first joining portion removably is connected with described second joining portion.
Needle assembly 3. according to claim 2 (10,10A), wherein

Described first joining portion (242,26A) be one in the profile portion (242) and the collar (26A), described second joining portion (32,365A) be another person in the collar (32) and the profile portion (365A), and

The described collar (32,26A) has through hole (321,261A), make in described profile portion (242 of when assembling, 365A) can pass described through hole from the first distolateral insertion of the described collar, but described profile portion insert pass described through hole after around axial direction (A) rotate under the situation of predetermined circumferential angle described profile portion by described collar backstop and in axial direction (A) back mobile.
Needle assembly 4. according to claim 3 (10,10A), wherein, described profile portion (242, radial cross section 365A) is non-circular, and described through hole (321,261A) be non-circular through hole with described profile portion approximate match.
Needle assembly 5. according to claim 4 (10,10A), wherein

Described profile portion (242,365A) be roughly microscler tabular body, and have contact surface (2421,3651A), two relative roughly straight sidepieces (2422,3652A) and the sidepiece of two relative circular arcs (2423,3653A), and

Described through hole (321, correspondingly be that radial cross section is roughly microscler through hole 261A), and have two relative roughly straight inner circle wall sections (3212,2612A) and the inner circle wall section of two relative circular arcs (3213,2613A).
6. needle assembly (10 according to claim 3,10A), wherein, the described collar (32,26A) (322,262A), described pockets is used to hold described profile portion (242 being provided with pockets with the described first distolateral second opposite distolateral place, 365A), make described profile portion by backstop and in axial direction (A) back move.
7. needle assembly according to claim 6 (10,10A), wherein, described pockets (322,262A) be with described profile portion (242,365A) the non-circular pockets of approximate match.
Needle assembly 8. according to claim 7 (10,10A), wherein, described pockets (322, be that (242,365A) radial cross section of approximate match is roughly microscler pockets with described profile portion 262A).
Needle assembly 9. according to claim 8 (10,10A), wherein

Described through hole (321,261A) be with described profile portion (242,365A) radial cross section of approximate match is roughly microscler through hole,

Described pockets (322, longitudinal center line 262A) and described through hole (321, longitudinal center line 261A) roughly overlaps, and

The radially longitudinal axis (B1) of described pockets and the skew mutually along the circumferential direction of the radially longitudinal axis (B2) of described through hole.
10. (10,10A), wherein, the radially longitudinal axis (B1) of described pockets along the circumferential direction is offset 90 degree with the radially longitudinal axis (B2) of described through hole to needle assembly according to claim 9 mutually.
11. needle assembly according to claim 2 (10,10A, 10B), wherein, described needle assembly also comprise bias component (40,40A, 40B), described bias component is arranged on described first member (20,20A, 20B) with described second member (30,30A, 30B), so that along described first member of direction bias voltage and described second member that described first member and described second member are separated from each other.
12. needle assembly according to claim 3 (10), wherein

Described first joining portion (242) is arranged on the described profile portion (242) of the lower end of described first member (20),

Described second joining portion (32) is arranged on the described collar (32) of the upper end of described second member (30), and

The needle body (36) that described second member also comprises cylindrical shell (34) and is connected the lower end of described cylindrical shell is provided with collar receiving cavity (341) at the upper end of described cylindrical shell, and the described collar is contained in the described collar receiving cavity.
13. needle assembly according to claim 12 (10), wherein, the described collar (32) is contained in the described collar receiving cavity (341) with interference fit.
14. needle assembly according to claim 12 (10), wherein

In described cylindrical shell (34), be provided with middle part receiving cavity (342), and

Described needle assembly also comprises bias component (40), and described bias component is contained in the receiving cavity of described middle part, so as upwards the described profile portion of bias voltage (242) thus make described profile portion against the described collar (32).
15. needle assembly according to claim 14 (10), wherein, described needle assembly also comprises the pad (50) that is arranged between described profile portion (242) and the described bias component (40).
16. needle assembly according to claim 14 (10), wherein

Described needle body (36) be connected to can with respect to described cylindrical shell (34) in axial direction (A) move up and down, and

Described needle assembly also comprises the force transfer unit (60) that is arranged between described bias component (40) and the described needle body, and described force transfer unit contacts with described needle body point, so as to realize needle with respect to valve seat from centering.
17. needle assembly according to claim 14 (10), wherein, described bias component (40) is helical spring (40).
18. needle assembly according to claim 3 (10A), wherein

Described first joining portion (26A) is arranged on the described collar (26A) of the lower end of described first member (20A),

Described second joining portion (365A) is arranged on the described profile portion (365A) of the upper end of described second member (30A), and

Described first member is sleeve (20A), is provided with collar receiving cavity (28A) at the lower end of described sleeve, and the described collar is contained in the described collar receiving cavity.
19. needle assembly according to claim 18 (10A), wherein, the described collar (26A) is contained in the described collar receiving cavity (28A) with interference fit.
20. needle assembly according to claim 18 (10A), wherein

In described sleeve (20A), be provided with middle part receiving cavity (29A), and

Described needle assembly also comprises bias component (40A), and described bias component is contained in the receiving cavity of described middle part, so as the described profile portion of biased downward (365A) thus make described profile portion against the described collar (26A).
21. needle assembly according to claim 20 (10A), wherein, described bias component (40A) is helical spring (40A).
22. needle assembly according to claim 2 (10B), wherein

Described first joining portion (27B) is one in groove (27B) and abutting part and the lower end that is arranged on described first member (20B),

Described second joining portion (3621B) is another person in abutting part (3621B) and the groove, and

Described needle assembly also comprises intermediate member (90B), and described first joining portion removably is connected by described intermediate member with described second joining portion.
23. needle assembly according to claim 22 (10B), wherein, described intermediate member (90B) is circlip (90B), described circlip removably is arranged in the described groove (27B), thus make the part of described circlip be embedded in the described groove and another part of described circlip protrude from described groove can the described abutting part of backstop (3621B).
24. needle assembly according to claim 23 (10B), wherein, described circlip comprises the main body portion (901B) that is general toroidal and from the extended grasping part of described main body portion (902B).
25. needle assembly according to claim 24 (10B), wherein

Described first member (20B) is sleeve (20B), and described first joining portion (27B) is arranged on the described groove (27B) at inner circle wall place of the lower end of described sleeve,

Described second joining portion (3621B) is arranged on the described abutting part (3621B) that described second member (30B) is located, and

Described grasping part (902B) is set to a pair of, and respectively from the end of described main body portion (901B) roughly radially extend internally and then in axial direction (A) extend.
26. needle assembly according to claim 24 (10B), wherein

Described first member (20B) is sleeve (20B), and described first joining portion is arranged on the described abutting part of the lower end of described sleeve,

Described second joining portion is arranged on the described groove at the described second member place, and

Described grasping part is set to a pair of, and respectively from the end of described main body portion roughly radially stretch out and then in axial direction (A) extend.
27. needle assembly according to claim 23 (10B), wherein, described needle assembly also comprises grommet (95B), described grommet is arranged between described circlip (90B) and the described abutting part (3621B), the part of described grommet can with another part of described circlip butt and described grommet can with described abutting part butt.
28. needle assembly according to claim 22 (10B), wherein, described abutting part is the flange (3621B) that radially outwards protrudes or radially to projecting inward flange.
29. an electric expansion valve is characterized in that comprising:

Driving mechanism;

Valve seat; And

As each described needle assembly in the claim 1 to 28 (10,10A, 10B).
30. electric expansion valve according to claim 29, wherein, described driving mechanism is the electromagnetic type driving mechanism, and described electromagnetic type driving mechanism comprises electromagnetic coil and the plunger that is used as described transmission part.
31. electric expansion valve according to claim 29, wherein, described driving mechanism is the electrodynamic type driving mechanism, and described electrodynamic type driving mechanism comprises motor and axle, described axle is configured to rotate integratedly with the rotor of described motor, and described axle is as described transmission part.
32. electric expansion valve according to claim 31, wherein, (20,20A 20B) is permanently connected with described axle or is threaded with the screw thread kind of drive described first member.
33. electric expansion valve according to claim 32, wherein, described first member (20,20A, 20B) be sleeve (20,20A, 20B), described sleeve is provided with anti-rotation structure in the periphery, and is provided with internal thread part in described sleeve, and described internal thread part is threaded with the male end of described axle.