JP2022093414A - Electronic expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic expansion valve.

SOLUTION: An electronic expansion valve (100) includes a valve body (10), a spindle assembly (20), a screw assembly (30), a rotor assembly (50), a stator assembly, and a sleeve (40), and is characterized in that: a guide sleeve (16) for guiding a movement of the spindle assembly (20) is provided inside the valve body (10); the spindle assembly (20) is provided to the guide sleeve (16); the screw assembly (30) is connected to the rotor assembly (50); the stator assembly can act on the rotor assembly (50) to drive the rotor assembly (50) to rotate; the screw assembly (30) can be moved through the rotation of the rotor assembly (50); a valve port (11) is bored in the valve body (10); the spindle assembly (20) is driven by the screw assembly (30) to open and close the valve port (11); and the sleeve (40) is provided to cover one end of the valve body (10) separate from the valve port (11).

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

(Related application)
[0001] This application is filed on August 17, 2018, with application number 2018213376030, name "electronic expansion valve", application number 20188213353433, filed on August 17, 2018, name "electronic expansion valve", 2018. Application No. 2008213375841 filed on August 17, 2018, name "Electronic Expansion Valve", Application No. 2008213357716 filed on August 17, 2018, name "Electronic Expansion Valve", filed on August 17, 2018. Application No. 2018213352750, name "Electronic Expansion Valve", application number 2018109433995 filed on August 17, 2018, name "Electronic Expansion Valve", application number 2018109434023 filed on August 17, 2018, name "Electronic". Expansion valve and air conditioning system using this electronic expansion valve ”, Application No. 2018213355354 filed on August 17, 2018, name“ Electronic expansion valve and air conditioning system using this electronic expansion valve ”, August 17, 2018. Application No. 2018109416190 filed on the same day, name "Electronic Expansion Valve and Air Conditioning System Using This Electronic Expansion Valve", Application No. 2008213352892 filed on August 17, 2018, Name "Electronic Expansion Valve and This Electronic Expansion Valve""Air conditioning system using the electronic expansion valve", application number 2018109427462 filed on August 17, 2018, name "electronic expansion valve and air conditioning system using this electronic expansion valve", application number filed on August 17, 2018. 201821335213X claims the priority of the Chinese patent application for the name "Electronic Expansion Valve and Air Conditioning System Using This Electronic Expansion Valve", the full text of which is incorporated herein by reference.

[0002] The present invention relates to the field of refrigeration technology, particularly to electronic expansion valves.

[0003] The electronic expansion valve opens and closes the valve opening opened in the valve body by the movement of the valve rod assembly in the guide sleeve and the nut sleeve, thereby achieving the purpose of controlling the flow rate and reducing the pressure by the throttle, and refrigerating. Widely applied in the technical field of equipment. Conventional electronic expansion valves are complicated to install, and the reliability and stability of the electronic expansion valves are reduced.

[0004] Based on this, various embodiments of the present application provide electronic expansion valves.

[0005] The technical aspects of this application are as follows.

[0006] The electronic expansion valve includes a valve body, a spindle assembly, a screw assembly, a rotor assembly, a stator assembly and a sleeve, and a guide sleeve is provided inside the valve body to guide the movement of the spindle assembly. Provided on the guide sleeve, the screw assembly is connected to the rotor assembly, the stator assembly can act on the rotor assembly to drive the rotation of the rotor assembly, and the rotation of the rotor assembly can move the screw assembly and valve. A valve opening is opened in the body, the spindle assembly is driven by the screw assembly to open and close the valve opening, and the sleeve is provided so as to cover one end away from the valve opening of the valve body.

[0007] Details of one or more embodiments of the present application are described in the drawings and description below. Other features, objectives and advantages of this application will be apparent in the description, drawings and claims. However, at the same time, it is necessary to ensure that some of the examples contain expressions corresponding to the original technical effects and advantages.

[0008] FIG. 6 is a perspective view of an electronic expansion valve provided by an embodiment. [0009] FIG. 6 is a cross-sectional view of an electronic expansion valve provided by an embodiment. [0010] FIG. 3 is a perspective view of an electronic expansion valve provided by another embodiment. [0011] FIG. 3 is a cross-sectional view of the electronic expansion valve provided by FIG. [0012] FIG. 6 is a cross-sectional view of a valve body provided by an embodiment. [0013] FIG. 6 is a cross-sectional view of a valve body provided with a second mounting step provided by one embodiment. [0014] FIG. 6 is a cross-sectional view of a valve body provided by another embodiment. [0015] FIG. 6 is a cross-sectional view of a valve body provided with a waste storage structure provided by one embodiment. [0016] It is an enlarged view in B provided by FIG. [0017] FIG. 6 is a cross-sectional view of a valve body provided with a position limiting portion provided by one embodiment. [0018] It is an enlarged view in C provided by FIG. [0019] FIG. 6 is a cross-sectional view of a waste storage structure provided by another embodiment. [0020] It is an enlarged view in D provided by FIG. [0021] FIG. 6 is a cross-sectional view of a guide sleeve provided by an embodiment. [0022] FIG. 6 is a cross-sectional view of a guide sleeve provided by another embodiment. [0023] FIG. 6 is a cross-sectional view of a guide sleeve provided by yet another embodiment. [0024] FIG. 3 is a perspective view of an electronic expansion valve omitting the sleeve and valve body provided by one embodiment. It is a perspective view of the screw assembly provided by one embodiment. [0026] FIG. 6 is a cross-sectional view of a spindle assembly and a screw assembly provided by an embodiment. [0027] FIG. 3 is a cross-sectional view of an electronic expansion valve provided by another embodiment. [0028] FIG. 2 is a cross-sectional view of the spindle assembly provided by FIG. [0029] FIG. 6 is a cross-sectional view of an electronic expansion valve provided with a noise reduction module provided by one embodiment. [0030] FIG. 3 is a cross-sectional view of a valve body in which a containment chamber provided by one embodiment is opened. It is sectional drawing of the noise reduction module provided by one Embodiment. [0032] FIG. 6 is a cross-sectional view of a noise reduction module provided by another embodiment. [0033] FIG. 6 is a cross-sectional view of a noise reduction module provided by yet another embodiment. [0034] FIG. 3 is a cross-sectional view of an electronic expansion valve provided with a welded structure provided by one embodiment. [0035] It is an enlarged view in E provided by FIG. 27. [0036] FIG. 3 is an enlarged view in A provided by FIG. [0037] FIG. 6 is a cross-sectional view of a guide sleeve provided by an embodiment. [0038] FIG. 6 is a perspective view of a connecting hand provided by an embodiment. [0039] Top view of the connecting hand provided by one embodiment. [0040] FIG. 3 is a perspective view of the nut sleeve provided by one embodiment. [0041] FIG. 6 is a cross-sectional view of a nut sleeve provided by an embodiment.

[0042] In the figure, the electronic expansion valve 100, the medium introduction pipe 101, the medium outlet pipe 102, the axis 103, the first end 104 of the valve body, the second end 105 of the valve body, the first chamfering 106, the second chamfering 107, Welding ring 108, welding bead 109, valve body 10, inlet 10a, outlet 10b, mounting bracket 10c, first mounting step 10d, second mounting step 10e, accommodation chamber 10f, valve opening 11, valve chamber 12, through hole 13, Mounting chamber 14, first positioning step 14a, position limiting portion 141, inner side surface 141a of position limiting portion, outer surface 141b of position limiting portion, opening 142, connecting chamber 15, mounting seat 110, mounting hole 111, guide sleeve 16 , Guide hole 16a, Spindle hole 16b, Flat surface 161; First cylindrical step 162, Step 162a, First end 162b of first cylindrical step; Second end 162c of first cylindrical step, Second cylindrical step 163, Third cylinder Step 164, guide structure 165, cam 166, connecting hand 17, first protrusion 18, connecting groove 19, waste storage structure 120, first waste storage groove 121, first waste guide structure 122, first waste guide portion 122a, first 2 Waste storage groove 123, 2nd waste guide structure 124, 2nd waste guide portion 124a, spindle assembly 20, spindle sleeve 21, spindle 22, concave groove 221, first spring seat 23, second spring seat 24, elastic member 25. , Guide holder 26, ball 27, screw assembly 30, screw 31, second protrusion 311, nut sleeve 32, first end 32a of nut sleeve, second end 32b of nut sleeve, locking groove 32c, engagement stage 321, Engagement hole 321a, second positioning step 322, retaining shoulder 323, sleeve 40, rotor assembly 50, rotor 51, adapter plate 52, position limiting member 53, spring 531 and retaining portion 531a, retaining ring 532, guide piece 54, noise. Reduction module 60, 3rd protrusion 61, noise reduction hole 62, 1st hole 621, 2nd hole 622, 3rd hole 623, cylindrical hole 621a, tapered hole 622a, welded structure 70, 4th protrusion 71, convex side 72 , Third chamfering 73, pressure equalization passage 80, pressure equalization hole 80a, first equalization passage 81, first equalization hole 811, second equalization hole 812, second equalization passage 82, third equalization passage The holes 821, the fourth equalization hole 822, and the fifth equalization hole 823.

[0043] Hereinafter, the present application will be described in more detail with reference to the drawings and specific embodiments.

[0044] As shown in FIGS. 1 and 2, the present application provides an electronic expansion valve 100 for regulating the flow rate and pressure of a fluid medium applied to an air conditioning refrigeration system. In the present embodiment, the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for cold heat exchange in the air conditioning refrigeration system, and the electronic expansion valve 100 narrows the high temperature and high pressure liquid refrigerant to a low temperature and low pressure gas-liquid two-phase refrigerant. It is used to reduce the pressure and exchange heat to achieve the purpose of freezing.

[0045] The electronic expansion valve 100 includes a valve body 10, a spindle assembly 20, a screw assembly 30, a sleeve 40, a rotor assembly 50 and a stator assembly (not shown), and the spindle assembly 20, the screw assembly 30 and the sleeve 40 include. Attached to the valve body 10, one end of the screw assembly 30 is connected to the spindle assembly 20, the other end is connected to the rotor assembly 50, the rotor assembly 50 is provided in the sleeve 40 and the stator assembly is provided in the sleeve 40. The stator assembly is energized to generate a magnetic field that rotates the rotor assembly 50 under the action of this magnetic force, which moves the screw assembly 30 so that the screw assembly 30 moves the spindle assembly 20 and the electronic expansion valve. Achieve 100 opening and closing to achieve the purpose of regulating flow rate and pressure.

[0046] As shown in FIG. 5, the valve body 10 is processed and manufactured of a stainless steel material. Of course, the valve body 10 may be processed and manufactured from other materials. In this embodiment, examples are not given one by one. The valve body 10 has a substantially cylindrical shape, and in other embodiments, the valve body 10 may have another shape.

[0047] The valve body 10 has an axis 103, and the valve port 11, the valve chamber 12, the through hole 13, the mounting chamber 14, and the connecting chamber 15 are sequentially opened on the valve body 10 along the shaft 103. The valve port 11 is used for the spindle assembly 20 to extend, thereby controlling the flow rate of the fluid medium in the valve port 11, and when the spindle assembly 20 closes the valve port 11, that is, the valve port 11 and the valve. When the communication with the chamber 12 is cut off, the electronic expansion valve 100 is closed, and when the spindle assembly 20 releases the seal to the valve port 11, that is, when the valve port 11 and the valve chamber 12 communicate with each other. The electronic expansion valve 100 is opened. The through hole 13 is formed at the bottom of the mounting chamber 14, and the hole diameter of the through hole 13 is smaller than the inner diameter of the mounting chamber 14. It should be understood that the installation of the through hole 13 forms a ring-shaped first positioning step 14a at the bottom of the mounting chamber 14, and the mounting chamber 14 and the connecting chamber 15 communicate with each other along the axis 103 direction.

[0048] The valve body 10 is provided with an inlet 10a and an outlet 10b for the fluid medium to enter. The valve port 11 is provided between the inlet 10a and the outlet 10b, the inlet 10a is communicated with the valve chamber 12, and the outlet 10b is communicated with the valve port 11 to control the movement of the spindle assembly 20. Achieves continuity or disconnection between the inlet 10a and the outlet 10b.

[0049] Preferably, a medium introduction pipe 101 for feeding the fluid medium is attached to the inlet 10a, and a medium outlet pipe 102 for sending out the fluid medium is attached to the outlet 10b. In the present embodiment, the fluid medium is a refrigerant, and the refrigerant flows from the medium introduction pipe 101 into the electronic expansion valve 100, is throttled by the electronic expansion valve 100, is depressurized, and is discharged from the medium outlet pipe 102.

[0050] Further, as shown in FIG. 6, a first protrusion 18 for attaching the medium outlet pipe 102 is provided at one end of the valve body 10 away from the sleeve 40, and the outlet 10b is provided along the axis 103. The outlet 10b is communicated with the valve port 11 and the medium outlet pipe 102 is welded and connected to the valve body in the present embodiment.

[0051] Preferably, a connecting groove 19 is opened at one end of the valve body 10 away from the sleeve 40, the first protrusion 18 is located at the bottom of the connecting groove 19, and one end of the medium outlet pipe 102 is the first protrusion 18. And abuts on the bottom of the connecting groove 19. Here, by providing the connecting groove 19, welding of the medium outlet pipe 102 and the valve body 10 can be facilitated, solder outflow can be prevented, and welding quality can be improved.

[0052] The valve body 10 is provided with a guide sleeve 16 and a connecting hand 17. The guide sleeve 16 is mounted in the mounting chamber 14 and is fastened and fitted to the mounting chamber 14. Here, the tightening fit means that the value obtained by subtracting the size of the outer diameter of the guide sleeve 16 to be engaged from the size of the inner diameter of the mounting chamber 14 is a negative value. The guide sleeve 16 is used to guide the spindle assembly 20 and move it along the axis 103 direction of the valve body 10. The connecting hand 17 is mounted in the connecting chamber 15 and is used to attach the screw assembly 30. Preferably, the connecting hand 17 is attached in the connecting chamber 15 by welding.

[0053] Further, the valve body is provided with the first mounting step 10d, the first mounting step 10d is located at one end where the connecting chamber 15 of the valve body 10 is opened, and the sleeve 40 is located at the first mounting step 10d. It is attached.

[0054] In one embodiment, as shown in FIGS. 3, 4, and 6, the valve body 10 may be provided with a mounting seat 110, and the sleeve 40 may be mounted on the mounting seat 110. One end of the guide sleeve 16 is mounted in the mounting chamber 14 and is fastened to the mounting chamber 14, the other end extends from the mounting chamber 14 and is connected to the screw assembly 30, and the connecting hand 17 is mounted. It is attached to the seat 110.

[0055] Further, the mounting seat 110 has a substantially cylindrical shape, and the mounting seat 110 is welded to the valve body 10 by welding. Of course, in other embodiments, the mounting seat 110 may be connected to the valve body 10 in other ways. The sleeve 40 is welded to the mounting seat 110 by welding, is closely connected to the mounting seat 110, a mounting hole 111 is opened in the mounting seat 110, and a part of the screw assembly 30 extends into the mounting hole 111. , Connected to the guide sleeve 16.

[0056] In the present embodiment, by providing the mounting seat 110, the mounting seat 110 is used to mount the screw assembly 30 and the sleeve 40 in place of a part of the function of the valve body 10, thereby the valve. The weight of the body 10 can be reduced, the difficulty of processing the valve port 11 in the valve body is reduced, the processing accuracy of the valve body 10 and the valve port 11 is ensured, and the flow rate control accuracy of the electronic expansion valve 100 is improved. did.

[0057] Preferably, the valve body 10 is provided with a second mounting step 10e, and the mounting seat 110 is welded to the second mounting step 10e. The valve body 10 and the mounting seat 110 may adopt an integrated structure or a separate structure, and in the present embodiment, the valve body 10 and the mounting seat 110 adopt a separate structure.

[0058] In one embodiment, as shown in FIGS. 10 and 11, one end of the mounting chamber 14 away from the valve opening 11 has a position limiting portion 141 in the circumferential direction. The engaging portion 161 is engaged with the position limiting portion 141 to realize the positioning of the guide sleeve 16 along the axis 103 direction, whereby the guide sleeve 16 is used for high pressure of the fluid medium and the fluid medium. It prevents noise from being loosened along the axis 103 due to factors such as high / low temperature.

Further, the position limiting portion 141 has an annular shape, and the inner diameter of the position limiting portion 141 is smaller than the inner diameter of the mounting chamber 14. Preferably, the cross section of the position limiting portion 141 along the plane in which the axis X is present is trapezoidal or arcuate. One end of the position limiting portion 141 having a large inner diameter is provided close to the mounting chamber 14, and one end of the position limiting portion 141 having a small inner diameter is provided away from the mounting chamber 14.

[0060] The position limiting portion 141 has an inner side surface 141a and an outer side surface 141b for contacting the guide sleeve 16 provided so as to face each other. An angle a is formed between the inner side surface 141a of the position limiting portion and the inner wall of the mounting chamber 14. It is understood that forming an angle a between the inner side surface 141a of the position limiting portion and the inner wall of the mounting chamber 14 corresponds to forming a shaft brim that restricts the movement of the guide sleeve 16 along the X axis. I want to be.

[0061] Preferably, the range of the angle a is 120 ° ≦ a ≦ l60 °. Thereby, the guide sleeve 16 can be mounted in the mounting chamber 14 in this angle range, and the movement of the guide sleeve 16 along the X-axis direction can be restricted. Specifically, in the present embodiment, the radius angle a = 160 °.

[0062] The position limiting portion 141 may have an integral structure with the valve body 10, or may be provided separately from the valve body 10. When the position limiting portion 141 and the valve body 10 are integrated, the valve body 10 can be easily processed and manufactured, and the manufacturing cost can be reduced. If the position limiting portion 141 and the valve body 10 are provided separately, the guide sleeve 16 can be easily attached. The above-mentioned two types of installation methods of the position limiting unit 141 and the valve body 10 have advantages, and a specific installation method of the position limiting unit 141 can be provided according to actual demand.

[0063] Of course, in other embodiments, the position limiting portion 141 can be provided as a stopper. At this time, the right angle between the stopper and the valve body 10 can be 90 degrees. The stopper has an annular shape and is mounted in the connecting chamber 15 by a lock member such as a bolt.

[0064] As shown in FIG. 14, the guide sleeve 16 is machined and manufactured in brass material, i.e., a brass guide sleeve, the brass material guide sleeve is relatively soft, the guide sleeve 16 and the fluid assembly 30 or valve body. It is possible to easily attach the 10 to each other and reduce noise due to the collision between the fluid medium and the guide sleeve 16. It is understood that in other embodiments, the guide sleeve 16 may be machined and manufactured from materials other than brass.

[0065] The guide sleeve 16 has a substantially cylindrical shape, the guide sleeve 16 and the valve port 11 are provided apart from each other, and the end surface of one end of the guide sleeve 16 near the valve port 11 is a flat surface 161. Here, since the plane 161 is a smooth surface or a smooth surface, that is, because the friction coefficient of the plane 161 is low, the fluid medium can flow along the plane 161 when passing through the plane 161 and causes noise of the fluid. Further reduce.

[0066] The guide sleeve 16 has an axis Y, and the guide sleeve 16 is provided with a guide hole 16a and a spindle hole 16b along the axis Y. The hole diameter of the spindle hole 16b is smaller than the hole diameter of the guide hole 16a. The spindle hole 16b is located at the bottom of the guide hole 16a and communicates with the guide hole 16a.

Since the hole diameter of the spindle hole 16b is smaller than the hole diameter of the guide hole 16a, the bottom of the guide hole 16a and the spindle hole 16b are combined to form a position limiting step 161a, and the spindle assembly 20 is inside the guide hole 16a. It should be understood that it is attached to and moves under the guidance of the guide hole 16a and the spindle hole 16b.

Further, as shown in FIGS. 4 and 12, the guide sleeve 16 can have a three-stage structure, and in the present embodiment, the guide sleeve 16 has a first cylindrical stage 162 mounted in the mounting chamber 14. , A second cylindrical step 163 for extending into the mounting hole 111 and engaging with the screw assembly 30, and a third cylindrical step 164 located in the valve chamber 12, and in other embodiments, a guide sleeve. 16 may have a two-stage structure.

[0069] The first cylindrical step 162 and the mounting chamber 14 are tightly fitted, and it is ensured that the axis of the guide sleeve 16 itself and the axis Y of the valve body 10 are provided so as to overlap each other in the mounting process of the guide sleeve 16. As a result, the coaxiality between the guide sleeve 16 and the valve opening 11 is ensured.

[0070] Preferably, the first cylindrical step 162 is a middle step, that is, it is located between the second cylindrical step 163 and the third cylindrical step 164, and the outer diameter of the first cylindrical step 162 is the second cylindrical step. It is larger than the outer diameter of 163 and the outer diameter of the third cylindrical step 164, respectively. In the first cylindrical step 162, a step 162a is formed between the second cylindrical step 163 and the third cylindrical step 164, respectively, and the step 162a between the first cylindrical step 162 and the second cylindrical step 163 is a mounting chamber. It should be appreciated that the bottom of 14 is engaged with the first positioning step 14a to achieve the positioning of the second cylindrical step 163.

Further, in one embodiment, the first cylindrical step 162 has a first end 162b and a second end 162c provided so as to face each other, and the second cylindrical step 163 is a second of the first cylindrical steps. Connected to the end 162c. The end face of the first end 162b of the first cylindrical stage is a plane 161. The axis Y is perpendicular to the plane 161. Since the end surface of the first end 162b of the first cylindrical stage is a flat surface 161 it is possible to reduce the frictional force of the contact between the fluid medium and the second cylindrical stage 163, further reduce the generation of noise, and use the user. Improves the comfort of use.

[0072] Preferably, the end face of the first end 162b of the first cylindrical stage is abutted against the bottom of the mounting chamber 14 to realize mounting of the guide sleeve 16. Further, the first end 162b of the first cylindrical stage has a guide structure 165 in the circumferential direction. Here, by providing the guide structure 165, the guide sleeve 16 can be easily attached. Further, one end of the second cylindrical step 163 separated from the first cylindrical step 162 also has a guide structure 165a in the circumferential direction.

[0073] Specifically, the guide structure 165 includes a guide portion 165a provided at the second end 162c of the first cylindrical stage. Preferably, the guide portion 165a is a fillet guide portion or a conical guide portion. Of course, in other embodiments, the guide structure 165 may be another structure.

[0074] As shown in FIG. 15, in another embodiment, the structure of the guide sleeve 16 basically matches the structure of the guide sleeve 16 in the above-described embodiment, and the structure of the guide sleeve 16 is the same as that of the first cylindrical stage. The difference is that the cam 166 is provided on the end surface of the one end 162b, and the end surface of one end of the cam 166 away from the first cylindrical stage is a flat surface 161. The cam 166 extends into the through hole 13 and the flat surface 161 is abutted against the first positioning step 14a, thereby realizing the positioning and mounting of the guide sleeve 16.

[0075] As shown in FIG. 16, in still another embodiment, the structure of the guide sleeve 16 basically matches the structure of the guide sleeve 16 in the above-described embodiment, and the structure of the guide sleeve 16 is the same as that of the first cylindrical stage. A third cylindrical step 164 is provided at the first end 162b, the third cylindrical step 164 and the valve port 11 are provided apart from each other, and one end of the third cylindrical step 164 away from the first cylindrical step 162 is a flat surface 161. It differs in some respects. The outer diameter of the third cylindrical step 164 is smaller than the outer diameter of the second cylindrical step 163, and a step 162a is also formed between the third cylindrical step 164 and the second cylindrical step 163. The third cylindrical step 164 extends into the valve chamber 12 through the through hole 13. Preferably, the third cylindrical step 164 is stepped.

[0076] Further, the length of the second cylindrical step 163 is 1/4 to 1/3 times the length of the guide sleeve. Here, the length of the second cylindrical step 163 is 1/4 to 1/3 times the length of the guide sleeve. Therefore, the guide sleeve 16 can be engaged with the screw assembly 30 with a sufficient engagement size, which can improve the reliability of the connection and at the same time reduce the risk of the guide sleeve 16 loosening due to vibration or the like. It can be understood. Of course, by lengthening the third cylindrical step 164, the overall length of the guide hole 16a becomes longer, the spindle assembly 20 is mounted in the guide hole 16a, and the overall coaxiality of the spindle assembly 20 is improved.

[0077] Preferably, the length of the second cylindrical step 163 is 3/10 times the length of the guide sleeve 16. It is understood that the length of the second cylindrical step 163 occupies approximately 1/3 times the length of the guide sleeve 16 to further improve the reliability of the connection between the second cylindrical step 163 and the screw assembly 30. ..

[0078] One end of the third cylindrical step 164 away from the first cylindrical step 162 also has a guide structure. Here, by providing the guide structure, the guide sleeve 16 can be easily attached. Specifically, the guide structure is a structure such as a chamfered or tapered surface provided in the first cylindrical step 162 and the third cylindrical step 164.

[0079] Further, the connecting hand 17 is welded and connected to the valve body 10, a mounting bracket 10c is further provided on the valve body 10, and the mounting bracket 10c is provided between the valve body 10 or the valve body 10 and the mounting seat 110. The mounting bracket 10c provided at the connection point is welded and connected to the valve body 10 or welded to the valve body 10 and the mounting seat 110, respectively, and the mounting bracket 10c is engaged with an external device and electronically expanded. Achieves the mounting of the valve 100.

[0080] Further, as shown in FIG. 8, a waste storage structure 120 is provided between the valve body 10 and the guide sleeve 16, and the waste storage structure 120 collects debris between the valve body 10 and the guide sleeve 16. Used for storage. This prevents debris on the valve body 10 and the guide sleeve 16 from entering the electronic expansion valve 100 in the form of impurities and affecting the normal operation of the electronic expansion valve 100 during the mounting process of the guide sleeve 16. ..

[0081] In one embodiment, as shown in FIG. 9, the mounting chamber 14 has an inner wall, and the waste storage structure 120 includes a first waste storage groove 121 opened in the circumferential direction of the inner wall of the mounting chamber 14. ..

[0082] Preferably, a plurality of first waste storage grooves 121 may be provided, and the plurality of first waste storage grooves 121 are provided at intervals on the inner wall of the mounting chamber 14 along the axis X of the valve body 10. Be done. Each of the groove openings of the first waste storage groove 121 has a first waste guide structure 122, whereby the debris on the valve body 10 and the guide sleeve 16 is guided into the first waste storage groove 121.

[0083] Specifically, the first waste guide structure 122 includes a first waste guide portion 122a provided on the inner wall of the mounting chamber 14, and the first waste guide portion 122a is a groove mouth of the first waste storage groove 121. Located in. Preferably, the first waste guide portion 122a is located on an inclined waste guide portion, a fillet waste guide portion, or the like.

[0084] Further, the mounting chamber 14 has an opening 142, and the opening 142 is provided apart from the valve opening 11. The first waste storage groove 121 is provided on the inner wall of the mounting chamber 14 in the vicinity of the end of the opening 142 of the mounting chamber 14. Therefore, on the premise that the requirements for assembly are satisfied, the angle between the guide sleeve 16 and the engagement stage at the end of the opening 142 of the mounting chamber 14 is made as small as possible to reduce the extrusion of debris.

[0085] In another embodiment, as shown in FIGS. 12 and 13, the guide sleeve 16 has an outer wall, and the waste storage structure 120 has a second waste storage groove opened in the circumferential direction of the outer wall of the guide sleeve. Includes 123.

[0086] Preferably, the second waste storage groove 123 is provided on the outer wall of the first cylindrical step 162. Further, the second waste storage groove 123 is provided close to the second end 162c of the first cylindrical step 162. That is, it is understood that it is provided at the second end 162c of the first cylindrical step 162 as a tightening step with the short mounting chamber 14 to reduce the extrusion of debris.

[0087] Further, a plurality of second waste storage grooves 123 may be provided. The plurality of second waste storage grooves 123 are provided at intervals on the outer wall of the first cylindrical step 162 along the axis Y of the guide sleeve 16. Each of the groove openings of the second waste storage groove 123 has a second waste guide structure 124, whereby the dust on the valve body 10 and the guide sleeve 16 is guided into the second waste storage groove 123.

[0088] Specifically, the second waste guide structure 124 includes a second waste guide portion 124a provided on the outer wall of the guide sleeve 16, and the second waste guide portion 124a is a groove mouth of the second waste storage groove 123. Located in. Preferably, the second waste guide portion 124a is provided on an inclined waste guide portion, a fillet waste guide portion, or the like.

[0089] In yet another embodiment, the mounting chamber 14 has an inner wall, the guide sleeve 16 has an outer wall, and the waste storage structure 120 is the first waste storage groove 121 in the first embodiment and the second embodiment. The second waste storage groove 123 is included. The first waste storage groove 121 on the inner wall of the mounting chamber 14 and the second waste storage groove 123 on the outer wall of the guide sleeve 16 are provided so as to be offset from each other along the axis 103 direction.

[0090] As shown in FIGS. 17, 18 and 19, in one embodiment, the spindle assembly 20 comprises a spindle sleeve 21 mounted within a guide sleeve 16 and a spindle 22 mounted within the spindle sleeve 21. Including, the spindle 22 has an axis, and the axis of the spindle 22 is provided so as to overlap the axis 103 of the valve body 10. One end of the spindle 22 is connected to the screw assembly 30, the other end is engaged with the valve opening 11, and the screw assembly 30 opens and closes the electronic expansion valve 100 by moving the spindle 22 to control the opening and closing of the valve opening 11. To realize.

[0091] The spindle assembly 20 further includes a first spring seat 23, a second spring seat 24, an elastic member 25 and a guide holder 26, and the first spring seat 23, the second spring seat 24 and the elastic member 25 are spindle sleeves. Housed in 21, the first spring seat 23 is connected to the screw assembly 30 and abuts on the guide holder 26, one end of the elastic member 25 is abut on the first spring seat 23 and the other end is the second. The guide holder 26 is abutted against the spring seat 24, the guide holder 26 is attached to one end of the spindle sleeve 21 away from the spindle 22, and is abutted against the second spring seat 24, and the guide holder 26 engages with the screw assembly 30. Used for.

[0092] Further, the spindle assembly 20 further includes a ball 27, the ball 27 being housed in a spindle sleeve 21, the ball 27 being provided between the spindle 22 and the screw assembly 30, with the spindle 22 and the screw assembly 30. By reducing the area of the friction contact surface of the spindle 22, the wear of the spindle 22 and the screw assembly 30 is reduced, and the reliability and stability of the electronic expansion valve 100 are improved.

[0093] Preferably, the ball 27 is provided between the second spring seat 24 and the spindle 22, and the ball 27 and the spindle 22 or the second spring seat 24 are welded by spot welding, and in the present embodiment, the spindle. A concave groove 221 is provided in the 22, the ball 27 is mounted in the concave groove 221 and the ball 27 and the spindle 22 are welded by spot welding. Here, by providing the ball 27, the second spring seat 24 and the spindle 22 come into point contact with each other, thereby reducing the area of the frictional contact surface between the second spring seat 24 and the spindle 22 and reducing the area of the frictional contact surface between the second spring seat 24 and the spindle 22. The contact wear between the 24 and the spindle 22 is reduced, and the reliability and stability of the electronic expansion valve 100 are improved.

[0094] As shown in FIGS. 19, 33 and 34, the screw assembly 30 includes a screw 31 and a nut sleeve 32, which has a first and second end facing each other. , One end of the screw 31 is connected to the rotor assembly 50, the second end of the screw 31 is bored in the nut sleeve 32 and connected to the first spring seat 23, the second end of the screw 31 and the nut sleeve 32. One end of the nut sleeve 32 is attached to the connecting hand 17.

[0095] Further, the nut sleeve 32 has a first end 32a and a second end 32b provided so as to face each other, the first end 32a of the nut sleeve is attached to the connecting hand 17, and the second end of the nut sleeve is attached. 32b is housed in the sleeve 40. An engaging step 321 extends to the first end 32a of the nut sleeve, and the engaging step 321 extends into the mounting hole 111 and is provided in close proximity to the first cylindrical step 162.

[0096] Preferably, a locking groove 32c is provided at the first end 32b of the nut sleeve, a locking projection is provided in the locking groove 32c, and a connection hole is formed in the connecting hand 17 correspondingly. , The first end 32b of the nut sleeve is mounted in the connection hole and realizes a locking connection with the connecting hand 17 by a locking projection. When the screw 31 rotates under the drive of the rotor assembly 50, the rotor assembly 50 and the like fixedly connected to the screw 31 and the screw 31 due to the nut screw engagement relationship formed between the screw 31 and the nut sleeve 32, and the like. It moves along the axial direction of the screw 31 so that the screw 31 realizes to move the spindle assembly 20.

Further, an engagement hole 321a is opened in the engagement step 321 and the third cylindrical step 164 extends into the nut sleeve 32 from the engagement hole 321a and is fixedly connected to the nut sleeve 32. It is understood that the engagement length between the guide sleeve 16 and the nut sleeve 32 can be extended by providing the engagement step 321 and the reliability of the connection between the guide sleeve 16 and the nut sleeve 32 is improved. ..

[0098] Preferably, the fixed connection includes a screw connection, a tightening fit, and the like. In the present embodiment, the nut sleeve 32 is corrected by the third cylindrical step 164 by tightening and fitting the third cylindrical step 164 and the nut sleeve 32, and the axis of the nut sleeve 32 is the axis of the guide sleeve 16. It is provided so as to overlap the axis of the valve body 10.

[0099] In the present embodiment, the first cylindrical step 162 and the mounting chamber 14 are tightened and fitted, and the third cylindrical step 164 and the nut sleeve 32 are tightened and fitted, so that the valve body 10 is fitted by the first cylindrical step 162. Is corrected, the nut sleeve 32 is corrected by the third cylindrical step 164, the three axes of the valve body 10, the guide sleeve 16 and the nut sleeve 32 overlap, and the three coaxialities of the screw 31, the spindle 22 and the valve opening 11. It is understood that the collision between the spindle 22 and the valve body 10 is reduced, the wear of members such as the spindle 22 is reduced, and the service life of the electronic expansion valve 100 is improved. To.

[00100] A second positioning step 322 may be provided in the nut sleeve 32, and the third cylindrical step 164 extends into the nut sleeve 32 and comes into contact with the second positioning step 322, so that the guide sleeve 16 has a second positioning step 322. The reliability of mounting is further improved, and the guide sleeve 16 is prevented from moving in the axial direction under the pressure of the fluid medium to generate noise.

[00101] As shown in FIGS. 20 and 21, in another embodiment, the basic structure of the spindle assembly 20 is essentially the same as the structure of the spindle assembly 20 described above, wherein the spindle assembly 20 is a bearing. Further including the 211, the gasket 212 and the elastic member 213, the bearing 211 and the gasket 212 are provided at one end of the screw assembly 30 near the spindle 22, one end of the elastic member 213 is in contact with the gasket 212, and the other end is with the spindle 22. One end of the bearing 211 is in contact with the screw assembly 30 and the spindle sleeve 21, the other end is in contact with the gasket 212, and the gasket 212 is housed in the spindle sleeve 21 and is in contact with the outer ring of the bearing 211. Is different.

[00102] The screw 31 is provided with a second protrusion 311 extending along the radial direction of the screw 31, the second protrusion 311 is flush with the inner surface of the spindle sleeve 21, and the inner ring of the bearing 211 is the second protrusion 311. The position of the screw 31 and the spindle sleeve 21 with respect to the bearing 211 is limited by the contact with the outer ring of the bearing 211 on the inner surface of the spindle sleeve 21.

[00103] The screw 31 is fixedly connected to the inner ring of the bearing 211. In the present embodiment, the screw 31 and the inner ring of the bearing 211 are fixed to each other by tightening, that is, the size of the screw 31 is larger than the hole diameter of the inner ring of the bearing 211, and at this time, the screw 31 and the bearing 211 are relatively different from each other. Has good connection stability.

[00104] It is understood that in other embodiments, the screw 31 and the inner ring of the bearing 211 may be fixed to each other by other connecting methods such as caulking, gluing and the like.

[00105] The screw 31 rotates under the drive of the rotor assembly 50, and the screw 31 moves and rotates the inner ring of the bearing 211 by the fixed connection between the screw 31 and the inner ring of the bearing 211. When the rolling element in the bearing 211 makes rolling contact with the outer ring of the bearing 211, the rotation by the screw 31 is released. Since there are a plurality of rolling elements in the bearing 211, the release of rotation of the screw 31 changes from the one-point rolling contact in the conventional electronic expansion valve 100 to the multi-point rolling contact in the present embodiment. Therefore, the contact force is shared by the plurality of rolling elements, the contact pressure at each contact point is reduced, and the rolling friction reduces the frictional force.

[00106] Further, due to the coaxial mounting of the bearing 211 and the screw 31, the contact force in the rolling element is perpendicular to the gravitational direction of the screw 31, which also provides the contact force at the contact point in the conventional electronic expansion valve. It was relatively reduced and the stability and reliability of the electronic expansion valve 100 were improved. At the same time, the bearing 211 has play, which allows the spindle 22 to have a certain degree of freedom and reduce the error due to the coaxiality between the spindle 22 and the valve port 11.

[00107] In the present embodiment, the elastic member 213 is a spring, and at this time, the elastic member 213 has a relatively high connection stability. It is understood that in other embodiments, the elastic member 213 may be another type of elastic element, such as an elastic column.

[00108] Continuing with reference to FIGS. 4 and 17, the rotor assembly 50 is positioned within the sleeve 40 to limit the rotation angle of the rotor 51, the adapter plate 52 for mounting the screw 31, and the rotor 51. The rotor 51 is attached to the adapter plate 52, including the limiting member 53 and the guide piece 54 attached to the adapter plate 52, and the adapter plate 52 and the screw 31 are fixedly connected by a method such as welding.

[00109] The position limiting member 53 includes a spring 531 overlaid on the nut sleeve and a retaining ring 532 attached to the guide piece 54, one end of the spring 531 being connected to the connecting hand 17 and the other end of the spring 531. A stop portion 531a is provided, and the stop ring 532 is wound around a spring 531. Preferably, a retaining shoulder 323 is provided on the outer wall of the nut sleeve 32, and the retaining shoulder 323 is used to engage the retaining ring 532 to limit the rotation angle of the rotor 51.

[00110] In one embodiment, in the process in which the rotor 51 rotates and moves along the axis 103 to drive the screw 31 to move the spindle 22 and close the valve opening 11, the stop ring 532 is along the spring 531. The moving stop ring 532 is abutted against the stop shoulder 323 to limit the rotation angle of the rotor 51, which is the lower limit position of the rotor 51. In the process in which the rotor 51 rotates and moves along the axis 103 to drive the screw 31 to move the spindle 22 to open the valve opening 11, the stop ring 532 moves along the spring 531 and the stop ring 532 stops. It is in contact with the portion 531a to limit the rotation angle of the rotor 51, which is the upper limit position of the rotor 51.

[00111] Further, the outer surface of the screw 31 extends outward along the radial direction of the screw 31 to form a cam 311, and the cam 311 on the screw 31 is brought into contact with the guide holder 26 to electronically expand. The lower limit position of the movement of the rotor 51 and the screw 31 in the valve 100 is fixed.

[00112] The lower limit position of the electronic expansion valve 100 is determined by the mutual contact between the screw 31 and the guide holder 26, and the screw 31 is a long and straight rod member, and an impact generated by a mechanical collision occurs. Since the direction of the force coincides with the axial direction of the screw 31, not only the vibration and noise generated by the screw are relatively low, but also the vibration and noise generated by the impact force can be quickly consumed on a long and straight rod. The noise generated by switching the moving state of the rotor assembly 50 due to the limitation of the lower limit position of the electronic expansion valve 100 is relatively reduced.

[00113] In one embodiment, the upper limit position of the electronic expansion valve 100 is realized by the mutual contact between the stop ring 532 and the stop portion 531a of the spring 531. In the process in which the rotor 51 rotates and moves along the axis 103, drives the screw 31 to move the spindle 22 and closes the valve opening 11, the stop ring 532 moves along the spring 531. The stop ring 532 is abutted against the stop portion 531a to limit the rotation angle of the rotor 51, which is the upper limit position of the rotor 51 and the screw 31.

[00114] In another embodiment, in order to further reduce the noise generated when the rotor assembly 50 in the electronic expansion valve 100 switches between moving states, the upper limit position of the electronic expansion valve 100 is the spindle assembly 20 of the screw 31. It is determined by the mutual contact between the sleeve 40 and one end away from the sleeve 40. By adjusting the size of the stop portion 531a of the spring 531 and the stop ring 532, the stop ring 532 does not come into contact with the stop portion 531a of the spring 531 when the sleeve 40 and the screw 31 are in contact with each other. Therefore, the contact between the screw 31 and the sleeve 40 is set as the upper limit position of the electronic expansion valve 100.

[00115] At this time, the upper limit position of the electronic expansion valve 100 is still determined by the screw 31, and the screw 31 is a long and straight rod member, and the direction of the impact force generated by the mechanical collision is determined. Not only is the vibration and noise generated in line with the axial direction of the screw 31 relatively low, but also the vibration and noise generated by the impact force can be quickly consumed on a long, straight rod, so that the electronic expansion valve 100 can be used. Due to the limitation of the upper limit position, the noise generated by switching the moving state of the rotor assembly 50 is relatively reduced.

[00116] Further, one end of the screw 31 near the sleeve 40 is curved so as to match the shape of the inner surface of the sleeve 40, and at this time, the screw 31 and the sleeve 40 have relatively good connection performance.

[00117] In still another embodiment, the upper limit position of the electronic expansion valve 100 can also be realized by abutting the guide holder 26 and the nut sleeve 32 on each other, and the nut sleeve 32 is abutted on the guide holder 26 to guide. Since the holder 26 is fixedly connected to the screw 31, the contact of the nut sleeve 32 with the guide holder 26 can be restricted so that the screw 31 is further separated from the valve opening 11. At this time, by setting the length of the screw 31, when the nut sleeve 32 and the guide holder 26 are in contact with each other, the screw 31 and the sleeve 40 are prevented from coming into contact with each other, whereby the electronic expansion valve 100 is prevented. It is ensured that the upper limit position of the nut sleeve 32 is determined by the contact between the nut sleeve 32 and the guide holder 26.

[00118] The nut sleeve 32 is a swivel member having a large volume, noise due to an impact force generated by a mechanical collision is relatively small, and vibration and noise due to vibration generated on the nut sleeve 32 can be quickly consumed. Therefore, the noise generated by switching the moving state of the rotor assembly 50 due to the limitation of the upper limit position of the electronic expansion valve 100 is relatively reduced.

[00119] When the upper limit position of the electronic expansion valve 100 is not realized by the mutual contact between the stop ring 532 and the stop portion 531a of the spring 531 that is, when the electronic expansion valve 100 adopts the above-described embodiment, the stop is stopped. It is understood that the ring 532 and the spring 531 may be omitted. The structure of the electronic expansion valve 100 in which the stop ring 532, the guide piece 54, and the spring 531 are omitted is as shown in FIGS. 18 and 19.

[00120] It is understood that the rotor assembly 50 and the screw assembly 30 move together, and the upper and lower limit positions in which the rotor assembly 50 moves, that is, the upper and lower limit positions in which the screw assembly 30 moves, are not distinguished herein. To.

[00121] The lower limit position referred to in the present specification refers to the maximum operating position in which the screw 31 moves toward the valve opening 11, and this operating position is called the lower limit position, which is the upper limit referred to in the present specification. The position refers to the maximum operating position in which the screw 31 moves away from the valve opening 11, and this operating position is called the upper limit position. The "upper" and "lower" in the upper limit position and the lower limit position do not have the concept of orientation and are added for convenience of explanation.

[00122] The stator assembly (not shown) includes a member such as a coil and is used to generate a magnetic field when energized. Under the action of the magnetic force, the rotor 51 is moved and rotated to rotate the screw 31. Achieve rotation.

[00123] In the present embodiment, the electronic expansion valve 100 is an electric electronic expansion valve, the rotor 51 is a motor rotor composed of a permanent magnet in a stepping motor, and the stator assembly is a motor stator in a stepping motor. After receiving the logical digital signal provided by the control circuit, the signal is transmitted to the coils of each phase of the motor stator, and the motor rotor consisting of a permanent magnet is affected by the magnetic moment to generate a rotational movement. This realizes the process of movement of the stator assembly to drive and rotate the rotor assembly.

[00124] The electronic expansion valve 100 in the present application employs an integrated valve seat, and since the spool valve seat of the conventional electronic expansion valve and the sleeve holder are integrated by using the integrated valve seat, electronic expansion is performed. The number of axial assembly of the valve 100 is reduced, that is, the possibility that the coaxiality of each component of the electronic expansion valve 100 is lowered due to multiple assembly is reduced, and the coaxiality between the components of the electronic expansion valve 100 is increased. The number of parts has been improved, the number of parts has been reduced, the valve opening performance of the electronic expansion valve 100 can be guaranteed, the installation has become more convenient, and the reliability and stability of the entire product have been improved.

[00125] Further, as shown in FIG. 7, the valve port 11 is provided coaxially with the valve body 10, and one end of the valve port 11 in which the valve port 11 is opened is referred to as a first end 104 of the valve body 10, and the valve body 10 is the first. The other end facing the first end 104 is referred to as a second end 105, and the valve port 11 is opened by cutting along the direction from the second end 105 to the first end 104. Since the machining method of cutting from the upper end is adopted, the valve port of the valve body 10 requires only one tightening during machining, which reduces the number of tightening times in the manufacturing process of the valve port 11 of the valve body 10. That is, the positioning error during processing of the valve port 11 of the valve body 10 is reduced, and the coaxiality between the valve port 11 and the valve body 10 is improved.

[00126] Further, since the valve opening 11 is directly opened in the valve body 10, the welding fixation between the valve seat core in which the valve opening is opened and the valve body is reduced as compared with the conventional electronic expansion valve, and the number of weldings is reduced. The decrease in the valve body 10 improved the integrity of the valve body 10 and improved the reliability and stability of the electronic expansion valve 100.

[00127] A first chamfer 106 is provided at one end of the valve port 11 near the second end 105 of the valve body 10, and by opening the first chamfer 106, a portion of the valve port 11 near the second end 105 of the valve body 10 is provided. An opening structure is formed in, the sealing performance in the valve port 11 of the spindle 22 can be improved, the internal leakage of the electronic expansion valve 100 is reduced, and the accuracy of control of the fluid flow rate of the electronic expansion valve 100 is improved. did.

[00128] A second chamfer 107 is provided at one end of the valve port 11 away from the second end 105 of the valve body 10, and is generated during the processing process of the valve port 11 due to the opening of the first chamfer 106 and the second chamfer 107. The burr is removed and the fluid medium has smoother flow characteristics as it passes through the valve opening 11.

[00129] Preferably, both the first chamfer 106 and the second chamfer 107 are smaller than 0.1 mm.

[00130] Further, in order to further isolate noise, the thickness of the wall where the valve body 10 and the guide sleeve 16 come into contact is 30% to 80% of the radius of the valve body 10. The thickness of the wall where the valve body 10 and the guide sleeve 16 come into contact is 30% to 80% of the radius of the valve body 10, noise is well isolated, and the flow noise of the fluid medium is transmitted to the inside of the valve body 10. Can be contained. If the wall thickness of the valve body 10 is too small, the sealing effect against noise becomes relatively low, and if the wall thickness of the valve body 10 is too large, members such as the spindle assembly 20 are fixed in the valve body 10. It is disadvantageous to install it.

[00131] Preferably, the wall thickness at which the valve body 10 and the guide sleeve 16 come into contact is 80% of the radius of the valve body 10.

[00132] As shown in FIG. 22, noise generated during the use process of the electronic expansion valve 100 is reduced, and turbulent noise due to flow instability when the fluid medium passes through the valve port 11 is reduced. Therefore, a noise reduction module 60 is installed between the medium outlet pipe 102 and the valve body 10, and the noise reduction module 60 is used to improve the stability when the fluid medium flows through the valve port 11. This reduces turbulent noise during the process of using the electronic expansion valve 100.

[00133] As shown in FIG. 23, the valve body 10 is provided with a storage chamber 10f communicating with the valve port 11, and the storage chamber 10f is used to house the noise reduction module 60. One end of the noise reduction module 60 extends outward along a direction perpendicular to the central axis of the valve body 10 to form a third protrusion 61, and the medium outlet pipe 102 is covered with a part of the noise reduction module 60. Moreover, it comes into contact with the third protrusion 61. One end of the noise reduction module 60 is in contact with the valve body 10, the other end is in contact with the medium lead-out pipe 102, and by welding and fixing the medium lead-out pipe 102 and the valve body 10, the noise reduction module 60 is in contact with the valve body 10 and the medium. It is sandwiched and fixed between the lead tube 102 and the lead tube 102.

[00134] In another embodiment, the noise reduction module 60 may be fixed between the valve body 10 and the medium lead-out pipe 102 by using another structure, for example, the medium lead-out pipe 102 may be a noise reduction module. It is understood that the third protrusion 61 formed on the noise reduction module 60 may be omitted at the time when the third protrusion 61 formed on the noise reduction module 60 may be directly abutted on the other end of the valve port 11 of the 60.

[00135] A noise reduction hole 62 is provided in the noise reduction module 60, the noise reduction hole 62 is connected to the end of the valve port 11, and the hole diameter communicating with the valve port 11 of the noise reduction hole 62 matches the hole diameter of the valve port 11. The fluid medium can flow smoothly when passing through the valve opening 11 and entering the noise reducing hole 62, and turbulent flow when the fluid medium passes through the valve opening 11 and enters the noise reducing hole 62. To avoid the occurrence of.

[00136] In the present embodiment, the noise reduction hole 62 is provided coaxially with the valve port 11.

[00137] Also referring to FIG. 24, in one embodiment, the noise reduction hole 62 is a stepped hole, and the noise reduction hole 62 gradually expands in a direction away from the valve port 11.

[00138] In the present embodiment, the noise reduction hole 62 is a three-stage stepped hole, the noise reduction hole 62 includes a first hole 621, a second hole 622, and a third hole 623, and the first hole 621 is a valve. Connected to the mouth 11, the first hole 621, the second hole 622, and the third hole 623 penetrate each other along the axial direction, and the second hole 622 is located between the first hole 621 and the third hole 623. The hole diameter of the third hole 623 is larger than the hole diameter of the second hole 622, and the hole diameter of the second hole 622 is larger than the hole diameter of the first hole 621.

[00139] In the present embodiment, in order to further reduce the turbulence generated when the fluid flows and reduce the noise during the use process of the electronic expansion valve 100, the first hole 621, the second hole 622, and the first hole 622 The three holes 623 are circular holes having symmetry and are provided coaxially.

[00140] Of course, when the fluid passes through the step hole, the center of each of the first hole 621, the second hole 622, and the third hole 623, if the turbulence that may occur due to the asymmetry of the structure is not taken into consideration. The shafts may be spaced apart from each other, and the first hole 621, the second hole 622, and the third hole 623 may adopt the shape of atypical holes.

[00141] In another embodiment, the noise reduction hole 62 may adopt a structure having two stages, four stages, and four or more stages, and the noise reduction hole 62 gradually moves away from the valve port 11. It is understood that it is only necessary to be able to form an expanding step hole.

[00142] Hereinafter, the principle that the noise reduction module 60 in the present embodiment reduces the flow noise of the fluid medium will be described.

[00143] The noise reduction hole 62 is a step hole, and when the fluid medium passes through the valve port 11 and enters the noise reduction hole 62, the effective flow cross section gradually expands in a stepped shape, and the fluid medium becomes the noise reduction hole 62. After entering, the flow velocity decreases and the fluid medium suppresses the generation of free shear sections by gradually expanding noise reduction holes, resulting in improved stability of the fluid medium and turbulent noise in the fluid medium. It is generated less, which reduces noise during use of the electronic expansion valve 100.

[00144] Also with reference to FIG. 25, in another embodiment, the noise reduction hole 62 is a horn hole, and the noise reduction hole 62 is a taper that communicates with the cylindrical hole 621a and the cylindrical hole 621a that communicate with the valve port 11. The tapered hole 622a, including the shaped hole 622a, is connected to one end of the cylindrical hole 621a and gradually expands in a direction away from the valve opening 11. The size of the hole diameter of the cylindrical hole 621a matches the size of the hole diameter of the valve port 11.

[00145] The tapered hole 622a may be directly connected to the valve port 11, that is, the size of the hole diameter at one end of the tapered hole 622a facing the valve port 11 may match the size of the hole diameter of the valve port 11. It is often understood that the cylindrical hole 621 may be omitted at this time.

[00146] Since the opening of the cylindrical hole 621a corresponds to increasing the length of the valve port 11, the stability of the fluid medium is further improved.

[00147] Hereinafter, the principle that the noise reduction module 60 in the present embodiment reduces the flow noise of the fluid medium will be described.

[00148] The noise reduction hole 62 is a horn hole, and the effective flow cross section when the fluid medium passes through the valve port 11 and enters the noise reduction hole 62 gradually expands, and the fluid medium enters the noise reduction hole 62. Later flow velocity is reduced and the fluid medium suppresses the formation of free shear sections with gradually expanding noise reduction holes, resulting in improved stability of the fluid medium and less turbulent noise in the fluid medium. As a result, noise generated during the use process of the electronic expansion valve 100 is reduced.

[00149] With reference to FIG. 26, in still another embodiment, the noise reduction hole 62 is a straight hole, and the noise reduction hole 62 penetrates both end surfaces of the noise reduction module 60 and is connected to the valve port 11, and noise. The hole diameter of the reduction hole 62 coincides with the hole diameter of the valve port 11.

[00150] Hereinafter, the principle that the noise reduction module 60 in the present embodiment reduces the flow noise of the fluid medium will be described.

[00151] The noise reduction hole 62 is a relatively long straight hole, and the noise reduction hole 62 corresponds to extending the length of the valve port 11, which corresponds to the inlet end of the valve port 11 and the noise reduction hole 62. The velocity gradient and pressure gradient of the fluid medium flowing through the end of the fluid medium were reduced, and as a result, the stability of the fluid medium was improved and the noise generated during the use process of the electronic expansion valve 100 was reduced.

[00152] Further, the noise reduction module 60 is modularized and fixed in the valve body 10, and the noise reduction module is provided separately from the valve body 10, which is already relatively shaped on the electronic expansion valve 100. The electronic expansion valve 100 can adopt a combination of a standardized valve body 10 and a customized noise reduction module without the need to open a valve port 11 having a complicated shape, which is more difficult to process, in the complicated valve body 10. In this way, further standardization of the parts of the electronic expansion valve 100 is realized.

[00153] As shown in FIGS. 27 and 28, a welding ring 108 is further provided at one end of the medium outlet pipe 102 in contact with the valve body 10, and the two adjacent side surfaces of the welding ring 108 are the valve body 10 and the valve body 10, respectively. In contact with the medium lead pipe 102, the weld ring 108 is used to fill the weld bead 109 between the valve body 10 and the medium lead pipe 102. The welding ring 108 is melted by high-temperature heating of an external welding device and flows into a welding bead 109 formed between the valve body 10 and the medium outlet pipe 102 as a filling material in a molten state, whereby the valve body 10 and the medium are formed. Welding fixation to the lead-out pipe 102 is realized.

[00154] Further, the electronic expansion valve 100 is further provided with a welded structure 70, and the welded structure 70 extends along a direction perpendicular to the axis 103 of the valve body 10 at one end near the medium outlet pipe 102 of the valve body 10. The medium lead-out pipe 102 includes the formed fourth protrusion 71 and is in contact with the fourth protrusion 71, and the contact surface between the medium lead-out pipe 102 and the fourth protrusion 71 is between the valve body 10 and the medium lead-out pipe 102. Is a weld bead 109 that needs to be filled with welding material.

[00155] By providing the fourth protrusion 71 on the valve body 10, the forming position of the weld bead 109 is provided toward the direction away from the contact end faces of the welding ring 108 and the valve body 10, whereby the welding ring 108 is formed. The center can be flush with the weld bead 109, and by flushing the center of the weld ring 108 with the weld bead 109, the weld ring 108 can smoothly flow into the weld bead 109 during welding. Welding crawls up and the occurrence of solder drop phenomenon is avoided.

[00156] The welded structure 70 further includes a convex side 72 provided on the medium lead-out pipe 102, and the medium lead-out pipe 102 extends from the fourth protrusion 71 along the axis 103 direction of the valve body 10 and has a convex side 72. That is, the thickness of the medium outlet pipe 102 is larger than the length extending in the radial direction of the fourth projection 71, and the welding ring 108 enters the weld bead 109 along the convex side 72 in a molten state during welding. This made it possible to further improve the welding quality between the valve body 10 and the medium lead-out pipe 102.

[00157] The welded structure 70 further includes a third chamfer 73 provided on the end surface where the medium outlet pipe 102 and the valve body 10 are in contact with each other, and the third chamfer 73 is the convex side 72 and the outer surface of the medium outlet pipe 102. The weld ring 108 is in contact with the valve body 10 by the third chamfer 73. With the opening of the third chamfer 73, the valve body 10 and the medium outlet pipe 102 form a storage space 74 for accommodating the welding ring 108, and this accommodation space has an opening structure, and the welding ring 108 has a valve body 10. And it is facilitated to be fixed by the medium lead-out pipe 102, and the welding ring 108 can also be easily entered into the welding bead 109 at the time of welding.

[00158] In the electronic expansion valve 100, the center of the welding ring 108 is flush with the welding bead 109 by providing the welding structure 70 in the valve body 10 and the medium lead-out pipe 102, and the welding ring 108 is in a molten state at the time of welding. It smoothly flows into the weld bead 109, the quality of the weld molding between the valve body 10 and the medium outlet pipe 102 is improved, and the reliability and stability of the electronic expansion valve 100 are improved.

[00159] As shown in FIG. 2, the electronic expansion valve 100 further includes a pressure equalizing passage 80, and the pressure equalizing passage 80 equalizes the pressure of the medium at the inlet 10a and the pressure inside the electronic expansion valve 100. Not only can this avoid impact on the guide sleeve 16 of the fluid medium and reduce noise, but at the same time the pressure equalization passage 80 has an electronic expansion valve 100 when the pressure of the medium at the inlet 10a changes. The pressure inside the electronic expansion valve 100 and the pressure at the inlet are quickly equalized, the phenomenon that an extra load is applied to the inside of the electronic expansion valve 100 is avoided, and the operational stability of the electronic expansion valve 100 is improved.

[00160] In one embodiment, the pressure equalizing passage 80 is provided between the guide sleeve 16 and the valve body 10, and the pressure equalizing passage 80 communicates the inside of the guide sleeve 16 and the valve body 10 with each other. Is used to equalize the pressure of the fluid medium at the inlet 10a with the pressure of the fluid medium inside the guide sleeve 16.

[00161] Further, as shown in FIG. 12, the pressure equalizing passage 80 is provided in the guide sleeve 16, and the pressure equalizing passage 80 communicates the valve chamber 12 and the guide hole 16a with the valve chamber 12 and the guide hole. By equalizing the pressure with 16a, when the valve opening 11 is opened, the fluid medium enters the valve chamber 12, and at the same time, a part of the fluid medium passes through the pressure equalizing passage 80 and enters the guide hole 16a. Entering and equalizing the pressure between the guide hole 16a and the valve chamber 11, this not only avoids the impact of the fluid medium on the guide sleeve 16 and reduces noise, but at the same time changes the pressure of the system. When doing so, the pressure inside the electronic expansion valve 100 can be quickly equalized, the extra load generated by the pressure difference is avoided, and the operational stability of the electronic expansion valve 100 is improved.

[00162] In the present embodiment, the pressure equalizing passage 80 equalizes the pressure between the valve chamber 12 and the guide hole 16a, that is, other than the valve chamber 12 inside the valve chamber 12 and the electronic expansion valve 100. The pressure of the portion is equalized so that the pressure is equalized throughout the inside of the electronic expansion valve 100, and the phenomenon that an extra load is applied to the inside of the electronic expansion valve 100 is avoided.

[00163] Preferably, the pressure equalizing passage 80 includes at least one pressure equalizing hole 80a, and the pressure equalizing hole 80a communicates the valve chamber 12 and the guide hole 16a with each other. As a result, a part of the fluid medium passes through the pressure equalizing hole 80a and enters the guide hole 16a, and achieves the purpose of pressure equalization.

[00164] The pressure equalizing hole 80a has an axis, and the axis of the pressure equalizing hole 80a is provided in parallel with the axis X. That is, the pressure equalizing hole 80a is formed perpendicular to the guide sleeve 16, whereby the pressure equalizing hole 80a does not affect the flow direction of the fluid medium, and noise caused by the change in the flow direction of the fluid medium. Is understood to eliminate.

[00165] Further, the number of pressure equalizing holes 80a is two, and the two pressure equalizing holes 80a are uniformly distributed in the guide sleeve 16 along the circumferential direction of the axis X. Of course, in the present embodiment, the number of the pressure equalizing holes 80a may be three, four, or the like, and the specific number of the pressure equalizing holes 80a may be set according to the actual demand.

[00166] Preferably, each of the pressure equalizing holes 80a is a circular pressure equalizing hole. Of course, in other embodiments, the pressure equalizing hole 80a may have another shape. For example, the pressure equalizing hole 80a is a rectangular or polygonal pressure equalizing hole.

[00167] In another embodiment, as shown in FIGS. 4, 30-34, the pressure equalization passage 80 is provided between the mounting seat 110, the guide sleeve 16 and the nut sleeve 32, and is provided between the inlet 10a and the guide. The inside of the sleeve 16, the inside of the mounting seat 110, the inside of the nut sleeve 32, and the inside of the sleeve 40 communicate with each other, and the pressure of the fluid medium at the inlet 10a, the inside of the guide sleeve 16, the inside of the mounting seat 110, and the nut. It is used to equalize the pressure of the fluid medium with the inside of the sleeve 32 and the inside of the sleeve 40.

[00168] The pressure equalization passage 80 includes a first equalization passage 81 and a second equalization passage 82, and the first equalization passage 81 is the inside of the inlet 10a and the guide sleeve 16, the inside of the screw assembly 30, and the sleeve. It is used to communicate the inside of the 40 with each other, and the second equalization passage 82 is provided to communicate the inside of the mounting seat 110 with the first equalization passage 81, whereby the first equalization passage 82 is provided. The inside of the guide sleeve 16, the inside of the mounting seat 110, the inside of the nut sleeve 32, the inside of the sleeve 40, and the inlet are communicated with each other by the 81 and the second equalization passage 82. When the fluid medium enters from the inlet 10a, some fluid medium passes through the first equalization passage 81 and enters the inside of the guide sleeve 16, the inside of the screw assembly 30, and the inside of the sleeve 40, and enters the second equalization passage. After passing through 82, it enters the inside of the mounting seat 110 and equalizes the medium pressures in various places inside the electronic expansion valve 100.

[00169] The first equalization passage 81 includes a first equalization hole 811 and a second equalization hole 812, and the first equalization hole 811 is provided in the guide sleeve 16 to form the inside of the guide sleeve and the valve chamber 12. A second equalizing hole 812 is provided in the nut sleeve 32 to communicate with the inside of the sleeve 40 and the inside of the nut sleeve 32, thereby communicating with the valve chamber 12. The inside of the guide sleeve 16, the inside of the nut sleeve 32, and the inside of the sleeve 40 communicate with each other to achieve the purpose of pressure equalization.

[00170] Further, the first equalization hole 811 has an axis, and the axis of the first equalization hole 811 is provided in parallel with the axis 103. That is, the first equalization hole 811 is opened perpendicularly to the guide sleeve 16, whereby the first equalization hole 811 does not affect the flow direction of the fluid medium and the flow direction of the fluid medium changes. It is understood to eliminate the noise.

[00171] Preferably, the number of the first equalization holes 811 is two, and the two first equalization holes 811 are uniformly distributed in the guide sleeve 16 along the circumferential direction of the axis 103. Of course, in the present embodiment, the number of the first equalization holes 811 may be three, four, or the like, and the specific number of the first equalization holes 811 may be set according to the actual demand.

[00172] Each of the first equalization holes 811 is a circular pressure equalization hole. In other embodiments, the first equalization hole 811 may have other shapes. For example, a rectangular or polygonal pressure equalizing hole.

[00173] The second equalization hole 812 has an axis, and the axis of the second equalization hole 812 is provided perpendicular to the axis of the first equalization hole 811. Of course, in other embodiments, the axis of the second equalization hole 812 does not have to be perpendicular to the axis of the first equalization hole 811.

[00174] The second equalization passage 82 includes the third equalization hole 821, the third equalization hole 821 is opened in the connecting hand 17, and the third equalization hole 821 is the inside of the mounting seat 110 and the sword 40. The third equalizing hole 821 is also used to attach the spring 531. One end of the spring 531 extends into the third equalization hole 821. The inside of the mounting seat 110 and the first leveling passage 81 are communicated with each other by the third leveling hole 821, and the fluid medium at the inlet 10a is mounted via the first leveling passage 81 and the third leveling hole 821. It is understood to enter the interior of the seat 110.

[00175] Preferably, the third equalization hole 821 is a groove hole, and the third equalization hole 821 is provided so as to open along a direction perpendicular to the axis of the valve body. The number of the third equalization holes 821 is plural. In the present embodiment, the number of the third equalization holes 821 is two, and the two third equalization holes 821 are provided symmetrically with respect to the axis of the valve body.

[00176] Further, as shown in FIGS. 2 and 3, the second equalization passage 82 may further include a fourth equalization hole 822 and a fifth equalization hole 823, wherein the fourth equalization hole 822 is a guide sleeve. The fifth equalization hole 823 was opened in the nut sleeve 32, and the fourth equalization hole 822 was communicated with the fifth equalization hole 823, whereby the fourth equalization hole 822 and the fifth equalization hole 822 were opened. The hole 823 communicates the inside of the guide sleeve 16 with the inside of the mounting seat 110. Here, by further providing the fourth equalization hole 822 and the fifth equalization hole 823, the speed of equalization of the medium pressure between the inside of the mounting seat 110 and the inlet 10a can be increased.

[00177] Further, the fourth equalization hole 822 is opened in the second cylindrical stage 163, the fifth equalization hole 823 is opened in the engagement stage 321, and the fourth equalization hole 822 and the fifth equalization hole 823 make it possible. Communication between the mounting hole 111 and the guide hole 16a is realized, whereby communication between the inside of the mounting seat 110 and the first equalization passage 81 is further realized.

[00178] The fourth equalization hole 822 has an axis, the fifth equalization hole 823 has an axis, and the axis of the fourth equalization hole 822 is provided so as to overlap the axis of the fifth equalization hole 823. , The axis of the fourth equalization hole 822 is provided perpendicular to the axis of the first equalization hole 811. Of course, in other embodiments, the axis of the fourth equalization hole 822 does not have to be provided so as to overlap the axis of the fifth equalization hole 823, and the fourth equalization hole 822 and the fifth equalization hole 823 are provided. As long as communication can be realized, the axis of the fourth equalization hole 822 does not have to be perpendicular to the axis of the first equalization hole 811.

[00179] The technical features of the embodiments described above can be in any combination, and for the sake of brevity, all possible combinations of the technical features in the above embodiments will be described. However, as long as there is no conflict in the combination of these technical features, any should be considered to be within the scope described herein.

[00180] The embodiments described above merely show some embodiments of the present invention, the description thereof being more specific and detailed, but thus limiting the scope of claims of the invention. Should not be understood as. It should be pointed out to those skilled in the art that some modifications and improvements are possible, all of which fall within the scope of the invention, as long as they do not deviate from the spirit of the invention. Therefore, the scope of protection of the patent of the present invention shall be in accordance with the scope of the attached claims.

Claims (12)

An electronic expansion valve including a valve body, a spindle assembly, a screw assembly, a rotor assembly, a stator assembly and a sleeve, wherein a guide sleeve for guiding the movement of the spindle assembly is provided inside the valve body, and the spindle assembly is the said. Provided on the guide sleeve, the screw assembly is connected to the rotor assembly, the stator assembly can act on the rotor assembly to drive the rotation of the rotor assembly, and the rotation of the rotor assembly causes the screw assembly. It can be moved so that the valve opening is opened in the valve body, the spindle assembly is driven by the screw assembly to open and close the valve opening, and the sleeve covers one end of the valve body away from the valve opening. An electronic expansion valve provided in. A medium outlet pipe is connected to the valve body, and after passing through the valve port, the fluid medium flows into the medium outlet pipe, passes through the medium outlet pipe, and is discharged to the outside, and the medium outlet pipe and the valve are discharged. A noise reduction module is provided between the body and the noise reduction module, a noise reduction hole is provided in the noise reduction module, the noise reduction hole is connected to the valve port, and the hole diameter of one end of the noise reduction hole connected to the valve port is the above. The electronic expansion valve according to claim 1, which matches the hole diameter of the valve opening. The noise reduction hole is a multi-stage step hole, and the step hole gradually expands or gradually expands in a direction away from the valve port.
The noise reduction hole includes a tapered hole, and the tapered hole gradually expands or gradually expands toward a direction away from the valve port.
The electronic expansion valve according to claim 2, wherein the noise reduction hole is a straight hole, and the straight hole penetrates both end surfaces of the noise reduction module. The valve body is provided with a welding ring and a first protrusion, the welding ring is in contact with the medium lead-out pipe, and the first protrusion is located at one end near the medium lead-out pipe of the valve body, and is in contact with the first protrusion. The electronic expansion valve according to claim 1, wherein a weld bead is formed between the medium lead pipe and the weld ring, and the center of the weld ring is flush with the weld bead. The spindle assembly includes a spindle, an elastic member, a bearing and a gasket, one end of the spindle being abutted against the elastic member and the other end being used to engage the valve port, the bearing being an outer ring and an inner ring. The electronic expansion according to claim 1, wherein the inner ring of the bearing is fixedly connected to the screw, one end of the gasket is brought into contact with the outer ring of the bearing, and the other end is brought into contact with the elastic member. valve. One end of the valve body in which the valve opening is opened is referred to as a first end, one end of the valve body facing the first end is referred to as a second end, and the valve port is from the second end. The electronic expansion valve according to claim 1, which is opened by cutting in a direction toward the first end. The electronic expansion valve according to claim 6, wherein a first chamfer is provided on an end surface of the valve port near the second end, and a second chamfer is provided on an end surface of the valve port away from the second end. The electronic expansion valve according to claim 6, wherein the thickness of the wall in which the valve body and the guide sleeve come into contact is 30% to 80% of the radius of the valve body. The electronic expansion valve further includes a pressure equalizing passage, and an inlet is opened so that a fluid medium flows into the valve body, and the pressure equalizing passage communicates the inlet with the inside of the electronic expansion valve. The electronic expansion valve according to claim 1, which equalizes the pressure of the fluid medium at the inlet and the pressure of the fluid medium inside the electronic expansion valve. The valve body is provided with a mounting seat, the mounting seat is mounted on the valve body, the sleeve is mounted on the mounting seat, and the pressure equalizing passage is inside the inlet and the guide sleeve, and the mounting seat. The inside of the screw assembly, the inside of the screw assembly and the inside of the sleeve communicate with each other, and the pressure of the fluid medium at the inlet and the inside of the guide sleeve, the inside of the mounting seat, the inside of the screw assembly and the sleeve. The electronic expansion valve according to claim 9, which equalizes the pressure of the fluid medium inside. The pressure equalization passage includes a first equalization passage and a second equalization passage, and the first equalization passage connects the inlet and the inside of the guide sleeve, the inside of the screw assembly, and the inside of the sleeve to each other. The electronic expansion valve according to claim 10, wherein the second equalization passage communicates with the inside of the mounting seat and the first equalization passage. The valve body is further provided with a mounting chamber that communicates with the valve port, and the guide sleeve is mounted in the mounting chamber and fastened to the mounting chamber, and debris is stored between the valve body and the guide sleeve. The electronic expansion valve according to claim 1, wherein a structure is provided, and the debris storage structure is used for storing debris between the valve body and the guide sleeve.

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