KR101478777B1 - Electric valve and stop device thereof - Google Patents

Abstract

The present invention relates to an electric valve comprising a spring guide rail and a sliding ring cooperatively cooperating in a helical manner, said spring guide rail having an upper stop portion and a lower stop portion, and a nut cooperating with a screw rod of the electric valve Wherein the nut has a radially extending stepped surface used to be fixedly connected to a valve seat of the electric valve and a snap-fit position-restricting surface is provided on a portion of the nut below the stepped surface; Wherein the spring guide rail is assembled around a portion of the nut on the step surface and the lower stop of the spring guide rail extends radially to form a positioning portion in contact with the step surface, And a portion of the lower stop portion snap-engaged onto the snap-on position-restricting surface on the nut to achieve positioning. Compared with the prior art, the present invention has the following advantages. The structure is simple and reliable and the stop spring guide rails can be easily and quickly fastened during the assembly process, effectively reducing the assembly process and significantly reducing assembly costs. Based on this, the present invention also discloses an electric valve including the aforementioned stopping device.

Description

ELECTRIC VALVE AND STOP DEVICE THEREOF FIELD OF THE INVENTION [0001]

The present invention relates to a valve, in particular, an electric valve and its stopping device.

Currently used electric valves include a shell, a stator coil surrounding the shell, a valve seat connected to the bottom of the shell, and a magnetic rotor located inside the shell, A needle and a valve core sheet, and a motor composed of a stator and a rotor is used to drive the valve needle to engage and disengage the valve. During operation, the rotor is controlled to rotate clockwise and counterclockwise. By the power transmission of the screw rod and the nut, the rotational movement of the rotor is converted into an axial linear displacement of the valve needle, thereby adjusting the flow rate of the refrigerant flowing into the evaporator and ensuring the efficient operation of the refrigeration system. Adjust the flow area of the hole. Clearly, it is necessary to provide stoppers for upper and lower limit positions in order to ensure that the upward and downward displacements of the valve needle are within a predetermined range.

Japanese Patent Publication No. JP2009162366A discloses an electric valve employing the above-mentioned principle. The sliding ring and the spring guide rail cooperating with each other are used to control the valve needle to move in the axial direction within a predetermined range. The nut cooperating with the valve needle is assembled in the inner hole on the upper part of the guide sleeve, the guide sleeve and the valve seat are fixed together by welding; The stop spring guide rail is engaged with the outer periphery of the guide sleeve, the rear portion of the stop spring guide rail is inserted into the positioning hole of the guide sleeve, and the rear portion of the spring guide rail is fixed Need to be; The spring guide rail and the sliding ring cooperate in a spiral manner in combination, and the sliding ring is urged by the spring guide rail under the action of the rotor until the sliding ring is in the limit operating position adjacent to the upper stop portion or the lower stop portion of the spring guide rail, As shown in FIG.

In the assembly process of the spring guide rails of the technical solution described above, first, after the spring guide rails are inserted into the positioning holes of the guide sleeves, the rear portions of the spring guide rails are fixed to secure absolutely reliable positioning ; Then, before the rear portion of the spring guide rail is fixed, the relative position of the spring guide rails needs to be controlled to ensure assembly accuracy. Clearly, in the technical solution of the above-described structure, many assembling processes are required and the assembling processes are not sufficiently simple, so that the assembling cost is increased and the manufacturing cost of the electric valve is increased.

As described above, in order to eliminate the disadvantage that many processes are required in the currently used structure, it is an urgent requirement to design the stopping device of the electric valve currently used.

SUMMARY OF THE INVENTION In view of the foregoing disadvantages, it is an object of the present invention to provide an electric valve stopper which can be simply assembled to effectively control the assembly cost of the electric valve. Based on this, the present invention also provides an electric valve including the aforementioned stopping device.

The present invention relates to an electric valve comprising a spring guide rail and a sliding ring cooperatively cooperating in a helical manner, said spring guide rail having an upper stop portion and a lower stop portion, and a nut cooperating with a screw rod of the electric valve Wherein the nut has a radially extending stepped surface used to be fixedly connected to a valve seat of the electric valve and a snap-fit position-restricting surface is provided on a portion of the nut below the stepped surface; Wherein the spring guide rail is assembled around a portion of the nut on the step surface and the lower stop of the spring guide rail extends radially to form a positioning portion in contact with the step surface, A portion of the lower stop provides snap engagement on the snap-on position-limiting surface on the nut to achieve positioning.

Preferably, Wherein said snap-on position-limiting surface refers specifically to a circumferential position-limiting surface arranged axially on said nut and to an axial position-limiting surface associated with said circumferential position-limiting surface; Wherein the portion of the lower stop below the positioning portion comprises a circumferential position-limiting portion formed by specifically extending axially and abutting the circumferential position-restricting surface, and a circumferentially- Quot; constraining surface " and refers to an axial position-limiting portion in contact with the axial position-limiting surface.

Preferably, the nut is formed of a plastic material, and an annular metal connecting piece used to be fixedly connected to the valve seat of the electric valve is fitted and fixed to an outer circumferential surface of the part of the nut below the step surface.

Preferably, the nut and the annular metal connecting piece are integrally injection-molded.

Preferably, a first groove arranged in the axial direction and a second groove arranged in the circumferential direction in communication with the first groove are provided on the body of the nut between the stepped surface and the annular metal connecting piece; The circumferential position-restricting surface and the axial position-restricting surface are each formed in a groove wall of the first and second grooves.

Preferably, a third groove is axially arranged on the body of the nut between the stepped surface and the annular metal connecting piece, and a first opening, axially opposed to the third groove, Restricting surface is formed on a sidewall of the groove wall of the third groove and the first opening and the axial position-restricting surface is located on the side of the first opening And is formed on the lower surface of the annular metal connecting piece.

Preferably, a second opening is formed in the periphery of the annular metal connecting piece, the circumferential position-restricting surface is formed in the side wall of the second opening, and the axial position- And is formed on the lower surface of the annular metal connecting piece located next to the ball.

The present invention relates to an electric valve comprising a valve seat and a shell forming an internal containment chamber, a valve needle screw rod component and a stop device cooperating with the rotor and arranged in the internal containment chamber, An electric valve employing an electric valve stopping device is disclosed.

Advantageously, the valve needle screw rod component comprises:

A valve needle disposed in a valve core seat positioned at the bottom of the valve seat, wherein one end of the valve needle cooperates with a valve aperture, and the other end of the valve needle is provided with an inwardly recessed receiving chamber said valve needle having a chamber;

A screw rod as claimed in any one of the preceding claims, wherein a central portion of the screw rod is spirally cooperated with the nut, one end of the screw rod is fixedly connected to the rotor, and the other end of the screw rod is inserted and assembled into the inwardly- The screw rod; And

A return resilient component disposed within the inwardly concave receiving chamber within the screw rod after pre-compression,

Wherein a portion of the screw rod disposed in the inwardly facing concave receiving chamber has a first position-limiting portion extending radially outward, and an outer circumference of the inwardly concave receiving chamber of the valve needle has a second, And the first position-restricted portion and the second position-restricted portion cooperate with each other.

The spring guide rail of the electric valve stopper according to the present invention is completely assembled on the top of the nut and the lower stopper portion of the spring guide rail extends radially to form a positioning portion in contact with the stepped surface of the nut, - Allow the assembled axial position setting to be realized. A portion of the lower stop below the positioning portion is snapped on the snap-on position-restricting surface on the nut to achieve positioning, . Compared with the prior art, the present invention has the following advantages. The structure is simple and reliable, and the stop spring guide rails can be easily and quickly fixed during the assembly process, effectively reducing the assembly process and significantly reducing assembly costs.

In a preferred technical solution according to the present invention, the spring guide rails are provided with snap engagement on the circumferential position-restricting surface and the axial position-restricting surface on the nut through its circumferential position- It is easier to assure the consistency of the relative position with respect to the stationary spring guide rails and the assembling precision of the stopper device is further improved.

In another preferred technical solution according to the invention, the nut is made of plastic material. Thus, when the sliding ring cooperates spirally along the spring guide rail, the frictional resistance of the relative sliding between the sliding ring and the outer circumferential surface of the plastic nut is relatively small, and the rotational resistance of the rotor of the electric valve is effectively reduced.

1 is a schematic view of the entire structure of an electric valve according to the first embodiment.
2 is a schematic view showing the assembly of the stopper of the electric valve according to the first embodiment.
3 is a perspective view of the electric valve according to the first embodiment before the rotor and the shell are mounted.
4 is a schematic view of the assembling of the stopping device of the electric valve according to the second embodiment.
5 is a perspective view of the electric valve according to the second embodiment before the rotor and the shell are mounted.
6 is a perspective view of the electric valve according to the third embodiment before the rotor and the shell are mounted.

An electric valve stopping device which can be simply assembled is provided in the present invention. Wherein the nut cooperating with the screw rod of the electric valve has a radially extending stepped surface and a snap-on position-restricting surface is provided on a portion of the nut below the stepped surface; A spring guide rail is assembled around a portion of the nut on the step surface and a lower stop portion of the spring guide rail extends radially to form a positioning portion adjacent the step surface, Some are snap-fit onto a snap-on position-restricting surface on the nut to be positioned. This technical solution can effectively control the assembly cost of the electric valve. Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Fig. 1, a schematic diagram of an overall structure of an electric valve according to an embodiment is shown.

1, the valve seat component is formed by the valve core sheet 11 and the valve seat 12, as well as the connecting pipes 13 and 14 welded to each other. The shell 5 is assembled around the valve seat 12 and welded thereto to form a sealed valve chamber. The valve needle screw rod component, the nut component, the rotor component and the stop device are disposed within the valve chamber.

The lower end of the valve needle 21 cooperates with the valve hole to open or close the electric valve. The upper end of the valve needle 21 has an inwardly concave receiving chamber in the axial direction and the upper end of the valve needle 21 is welded to the valve needle bushing 22 to extend radially inwardly from the periphery of the inwardly concave receiving chamber. Forming a 2 position-constraining portion; The lower end of the screw rod 23 is inserted and assembled into the valve needle bushing 22 and the retainer ring 24 provided in the inwardly concave receiving chamber is welded to the head portion of the screw rod 23 to extend radially outwardly Forming a first position-restricted portion. The retainer ring 24 contacts the valve needle bushing 22 and cooperates therewith to realize the axial position limitation of the screw rod 23. A spring (25) is arranged in the inwardly concave receiving chamber to return the screw rod (23). Of course, the spring 25 is not limited to helical compression springs as shown, arranged in the inwardly concave receiving chamber after pre-compression. In effect, any return elastic component which can be arranged in said inwardly concave receiving chamber inside the screw rod after pre-compression is usable. Similarly, the manner of securing and connecting between the valve needle 21 and the valve needle bushing 22 as well as between the screw rod 23 and the retainer ring 24 is not limited to welding; Other connection methods such as interference fit can also be applied.

The nut component includes a plastic nut (32) and an annular metal connecting piece (31). The metal connecting piece 31 is fitted in the outer circumferential surface of the nut body under the stepped surface of the plastic nut and is used to fix the valve seat of the electric valve by welding. The plastic nut 32 is preferably made of engineering resin and formed integrally with the annular metal connecting piece 31 by injection molding.

The stopping devices are combined and spirally cooperated A spring guide rail 33 and a sliding ring 34. The spring guide rail 33 has an upper stop and a lower stop which are assembled around the outer circumferential surface of the upper portion of the plastic nut 32 and cooperate with the stop slide ring 34 for position-limiting.

The rotor component comprises a magnetic rotor 41, a rotor stop 42 and a connecting body for connecting the rotor 41 and the rotor stop 42. The magnetic rotor 41 is assembled around the outside of the spring guide rail 33 and the rotor stop 42 extends in the axial direction to cooperate with the sliding ring 34; The above-described spring guide rail 33, the sliding ring 34, and the rotor stopper 42 constitute a stopping mechanism of the electric valve.

In the technical solution of the present invention, the above-mentioned snap-on position-limiting surface is in particular a circumferential position-restricting surface arranged axially on the nut 32 and an axial position - See Restriction Surfaces. The above-mentioned lower stopper portion under the positioning portion of the spring guide rail 33 is formed by extending in the circumferential direction from the circumferential position-restricting portion in particular, as well as the axial position-restricting portion abutting the axial position- Refer to the circumferential position-limited portion formed by and extending axially from the position-restricting surface. In this way, it is easier to assure the consistency of the relative position of the stop spring guide rails, thereby improving the assembly accuracy of the stop device. With particular reference to Fig. 2, an assembly schematic view of an electric valve stopping device according to the present embodiment is shown.

The plastic nut 32 is injection molded with engineering plastics and its body can be divided into upper, middle and lower parts. The outer periphery of the upper portion 32a is a peripheral assembling portion for the spring guide rail 33; The outer periphery of the middle portion 32b is larger than the outer periphery of the upper portion; The stepped surface is formed between the upper portion 32a and the middle portion 32b and the middle portion 32b has the protrusion 32d at the center where the third groove 32e is provided; The metal connecting piece 31 is fitted in and fixed to the middle portion 32b; The lower portion 32c is used to be connected to the valve core sheet 11. The outer periphery of the metal connecting piece 41 integrally formed with the nut 32 by injection molding has a plurality of open holes 31c and one of the open holes 31c is formed directly below the protruding portion 32d of the plastic nut . In other words, the circumferential position-restricting surface is formed in the groove wall of the third groove and in the side wall of the first opening, and the axial position-restricting surface is formed in the lower surface of the annular metal connecting piece located next to the first opening . The remaining openings 31c other than the openings 31 located immediately under the protrusions 32d communicate the upper accommodating chamber on the metal connecting piece 31 with the lower accommodating chamber below the metal connecting piece 31, Thereby establishing a pressure balance in the two receiving chambers.

The spring guide rail 33 is formed by winding a steel wire. The main body of the spring guide rail 33 forms a spiral guide portion 33b and the upper portion of the spring guide rail 33 forms an upper stopper portion 33a and the lower portion of the spring guide rail 33 forms a lower stopper portion 33c. The lower stop 33c extends radially to form a positioning portion in contact with the stepped surface and extends axially downward from the positioning portion to define a circumferential position-limited portion 33d of the spring guide rail 33 And the circumferential position-restricting portion 33d further extends in the circumferential direction to form the axial position-restricting portion 33e of the spring guide rail 33. As shown in Fig.

The sliding ring 34 is also formed by winding a steel wire and is constituted in order by a stop head portion 34a, a helical guide portion 34b and a stop rear portion 34c. The nut 32 is preferably made of plastic so that the relative sliding between the sliding ring 34 and the outer peripheral surface of the plastic nut 32 when the sliding ring 34 spirally cooperates with the spring guide rail 33 The frictional resistance of the electric valve is relatively small, and the rotational resistance of the rotor of the electric valve is effectively reduced.

A method of assembling the various components in the stopping device of the technical solution of the present invention will be described with reference to the sequence of arrows as shown in Fig. The axis of the spiral guide portion 34b of the sliding ring 34 coincides with the axis of the spiral guide portion 33b of the spring guide rail 33 along the spiral direction of the spring guide rail 33, 34) is disposed on a first turn of the helical body of the spring guide rail (33); The sliding ring 34 and the spring guide rail 33 are assembled around the periphery of the outer periphery of the upper portion 32a of the plastic nut 32 so that the positioning portion of the spring guide rail 33 contacts the step 33 of the nut 31, Contacting the surface to achieve pre-positioning; The rear portion (axial position-restricting portion 33e) of the spring guide rail 33 is pulled away from the axis and released so that the circumferential position-restricting portion 33d of the spring guide rail 33 is released from the action of the elastic force And is snap-engaged in an opening 31c on the outer periphery of the metal connecting piece 41, which is returned to the original position under the first groove 32e and arranged on the projection of the plastic nut 32; At this time, the axial position-restricting portion 33e of the spring guide rail 33 is also snap-engaged onto the lower surface of the metal connecting piece 31 located on the side of the opening hole 31c. After completing the assembly process described above, the spring guide rail 33 is fixed.

3, there is shown a perspective view of an electric valve according to this embodiment in which a rotor and a shell are mounted. As shown, the nuts and stoppers assembled according to the assembly method and order described above are disposed on the valve seat component, that is, the lower portion of the plastic nut 32 is inserted and assembled on the valve core 11, The metal connecting piece 31 is then welded to the top edge of the valve seat 12 by a welding method (such as laser welding) to reliably position the nut 32 and secure the nut 32 to the valve seat 12 So as not to be rotated or pulled. After welding, the rear portion of the spring guide rail 33 can no longer be pulled away from the axis due to the restriction of the valve seat 12 and the metal connecting piece 31, so that the spring guide rail 33 And is reliably limited to a fixed position.

Compared with the prior art, the present invention has the following advantages. The structure of the present invention is simple and reliable, and it is possible to fix the stop spring guide rail easily and quickly in the assembling process. As a result, the assembly process is effectively reduced and the assembly cost is significantly reduced.

As shown in Fig. 1, after the assembly of the stopper is finished according to the assembly method and order described above, the screw rod 23 and the sliding ring 34 are adjusted to a specified position; The rotor 41 having the rotor stop 42 is then assembled to the top of the screw rod 23 at a specified position and the rotor connecting body is welded to the top of the screw rod 23, Integrally connecting the electron 41 and the screw rod 23; Finally, the shell 5 is assembled on the valve seat 12, and the lower end of the shell 5 is sealingly welded to the upper end of the valve seat 12. In this way, when the electric valve is operated, the coil is driven to rotate the rotor 41 of the electric valve, and the stop portion of the rotor 41 rotates the sliding ring 34 to the spiral guide portion 33 of the spring guide rail 33, (33b). When the sliding ring 34 is rotated up to the limit point, the sliding ring 34 will be limited from continuous upward rotation by the upper stop 33a of the spring guide rail 33 to realize the effect of top stop; When the sliding ring 34 is rotated downward to the limit point, the sliding ring 34 is limited from continuous downward rotation by the lower stopper portion 33c of the spring guide rail 33 to realize the effect of lower stopping.

The snap-on position-restricting surface is not limited to the structural configuration of the circumferential position-restricting surface and the axial position-restricting surface as shown in this embodiment and the rear portion of the spring guide rail 33 may be circumferentially and / It should be noted that all structural arrangements capable of positioning and securing in the axial direction fall within the protection category of the present invention. Hereinafter, two embodiments will be described in detail.

4 and 5, FIG. 4 is a schematic view of assembling the electric valve stop device according to the second embodiment, and FIG. 5 is a perspective view of the electric valve according to the second embodiment before the rotor and the shell are mounted.

The components and connection relationships applied to this embodiment are the same as those of the first embodiment. As shown in FIGS. 4 and 5, the difference between the two embodiments is that the arrangement of the position-restricting grooves on the plastic nut 32 cooperating with the position-restricting portion on the spring guide rail 33 is different.

In the technical solution of the present invention, the position-restricting grooves of the plastic nut 32 are L-shaped, that is, the first grooves arranged in the axial direction and the second grooves arranged in the circumferential direction in communication with the first grooves, The groove is provided on the body of the nut 32 between the stepped surface and the annular metal connecting piece 31; The circumferential position-restricting surface and the axial position-restricting surface are respectively formed in the groove walls of the first and second grooves. Therefore, as in the first embodiment, the circumferential position-limited portion 33d and the axial position-restricted portion 33e of the spring guide rail 33 are formed in the "L" shape. The rear portion of the spring guide rail 33 is pulled away from the axis so that the positioning portion of the spring guide rail 33 is in contact with the stepped surface of the nut 32 and then the spring guide rail 33 Is released so that the position-restricting portion of the spring guide rail 33 is returned to its original position under the action of the elastic force; At this time, the L-shaped circumferential position-restricting portion 33d and the axial position-restricting portion 33e of the spring guide rail 33 snap into the L-shaped groove of the plastic nut 32 directly. In the present embodiment, it is preferable that the "L" type is applied, but various variations such as "P "," V ", "U ", C & Can be applied to achieve a fixed effect, all of which fall under the protection category of the present invention.

Referring to Fig. 6, Fig. 6 is a perspective view of an electric valve according to a third embodiment before the rotor and the shell are mounted.

The components and connection relationships applied to this embodiment are the same as those of the first and second embodiments. 6, the design of the present invention is simplified on the basis of the first embodiment, that is, there is no projecting portion or position-restricting groove in the middle portion of the plastic nut 32 of the technical solution of the present invention, The structure of the portion is the same as that of the first embodiment. The positioning and fixing of the spring guide rail 33 of the present embodiment is realized by only one of the openings 31c of the metal connecting piece 31. [ After the nut and stop assembly component is assembled and secured to the valve seat component, the rear portion of the spring guide rail 33 is fully snap-engaged with the opening in the metal connecting piece 31 and the lower surface positioned next to the opening Is limited.

Only the preferred embodiments according to the present invention are described above. It will be appreciated by those of ordinary skill in the art that several modifications and variations can be made without departing from the principles of this invention and that these modifications and variations are also within the scope of the present invention will be.

11: valve core sheet 12: valve seat
13: connecting pipe 14: connecting pipe
21: valve needle 22: valve needle bushing
23: screw rod 24: retainer ring
25: spring 31: metal connecting piece
31c: Opening hole 32: Nut
32a: upper part of the nut 32b: middle part of the nut
32c: Lower part of the nut 32d:
32e: third groove 33: spring guide rail
33a: upper stopper portion 33b: spiral guide portion
33c: lower stop 33d: circumferential position-restricted portion
33e: Axial position-restricted portion 34: Sliding ring
34a: upper stop head portion 34b: spiral guide portion
34c: lower stop rear portion 41: rotor
42: rotor stop 5: shell

Claims (9)

A spring guide rail, and a sliding ring formed to be slidably engaged with the spring guide rail, wherein the spring guide rail has an upper stop portion and a lower stop portion,
Further comprising: a nut cooperating with a screw rod of the electric valve, the nut having a radially extending stepped surface used to be fixedly connected to a valve seat of the electric valve; A snap-fit position-restricting surface is provided on a portion of said nut below said step surface;
Wherein the spring guide rail is assembled on a portion of the nut on the step surface and the lower stop portion of the spring guide rail extends radially to form a positioning portion in contact with the step surface, And a portion of the lower stop is snapped on the snap-on position-limiting surface on the nut to achieve positioning. 2. The apparatus of claim 1 wherein the snap-on position-limiting surface includes a circumferential position-limiting surface disposed axially on the nut and an axial position-limiting surface associated with the circumferential position-limiting surface;
Wherein a portion of the lower stop below the positioning portion extends axially in the positioning portion and includes a circumferential position-limiting portion abutting the circumferential position-restricting surface and a circumferentially- And an axial position-restricting portion in contact with said axial position-restricting surface. The nut according to claim 2, wherein the nut is formed of a plastic material, and the annular metal connecting piece used to fixably connect with the valve seat of the electric valve is fixed to the outer circumferential surface of the part of the nut below the step surface Characterized in that the electric valve stopping device. 4. The apparatus according to claim 3, wherein the nut and the annular metal connecting piece are integrally injection-molded. 4. The apparatus of claim 3, wherein a first groove arranged in the axial direction and a second groove communicating with the first groove and arranged in the circumferential direction are provided on the body of the nut between the stepped surface and the annular metal connecting piece; Wherein the circumferential position-restricting surface and the axial position-restricting surface are formed in the groove walls of the first and second grooves, respectively. 4. The nut according to claim 3, wherein a third groove is axially arranged on the body of the nut between the stepped surface and the annular metal connecting piece, and a first opening axially opposed to the third groove, Restricting surface is formed on a sidewall of the groove wall of the third groove and the first opening and the axial position-restricting surface is formed on the side of the first opening, Wherein the annular metal connecting piece is formed on the lower surface of the annular metal connecting piece. 4. The apparatus of claim 3, wherein a second opening is formed in the periphery of the annular metal connecting piece, the circumferential position-limiting surface is formed in a side wall of the second opening, Wherein the annular metal connecting piece is formed on the lower surface of the annular metal connecting piece located on the side of the second opening. An electric valve comprising a valve seat, a shell welded on the valve seat, a valve seat screw rod component each arranged in the receiving chamber and an inner receiving chamber formed in the valve seat and the shell, ,
Wherein the stop device is an electric valve device according to one of the claims 1 to 7, wherein the valve needle screw rod component comprises a valve needle disposed in a valve core seat located at the bottom of the valve seat, A screw rod fixedly connected to the electron, the rotor having a stop,
Wherein the spring guide rail and the sliding ring of the stopping device and the rotor stop form a stopping mechanism of the electric valve. 9. The method of claim 8,
One end of the valve needle cooperating with the valve hole and the other end of the valve needle being provided with an axially oriented inwardly concave receiving chamber;
A central portion of the screw rod coaxial with the nut and one end of the screw rod is fixedly connected to the rotor and the other end of the screw rod is inserted and assembled into the inwardly concave chamber of the valve needle;
The valve needle screw rod component further comprises a return resilient component disposed within the inwardly concave receiving chamber within the screw rod after being pre-compressed;
Wherein a portion of the screw rod disposed in the inwardly facing concave receiving chamber has a first position-limiting portion extending radially outward, and an outer circumference of the inwardly concave receiving chamber of the valve needle has a second, Wherein the first position-limiting portion and the second position-limiting portion cooperate with each other.

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