JP7386283B2 - electronic expansion valve - Google Patents

Description

(Related application)
[0001] This application is filed under Application No. 2018213376030 filed on August 17, 2018, titled "Electronic Expansion Valve", and Application No. 2018213353433 filed on August 17, 2018, titled "Electronic Expansion Valve", 2018 Application number 2018213375841, filed on August 17, 2018, titled "Electronic expansion valve" Application number 2018213357716, filed on August 17, 2018, titled "Electronic expansion valve", filed on August 17, 2018 Application number 2018213352750, title "Electronic expansion valve", Application number 2018109433995, title "Electronic expansion valve", filed on August 17, 2018, Application number 2018109434023, title "Electronic expansion valve", filed on August 17, 2018 "Expansion valve and air conditioning system using this electronic expansion valve", Application number 2018213355354 filed on August 17, 2018, Title: "Electronic expansion valve and air conditioning system using this electronic expansion valve", August 17, 2018 Application No. 2018109416190 filed on August 17, 2018, titled "Electronic expansion valve and air conditioning system using this electronic expansion valve" Application number 2018213352892, filed on August 17, 2018, titled "Electronic expansion valve and this electronic expansion valve""Air conditioning system using electronic expansion valve", application number 2018109427462 filed on August 17, 2018, title "Electronic expansion valve and air conditioning system using this electronic expansion valve", application number filed on August 17, 2018 No. 201821335213X, entitled "Electronic expansion valve and air conditioning system using the electronic expansion valve", claims priority to the Chinese patent application, the entire contents of which are incorporated herein by reference.

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

[0003] The electronic expansion valve opens and closes the valve opening provided in the valve body by the movement of the valve rod assembly within the guide sleeve and nut sleeve, thereby realizing the purpose of regulating the flow rate and reducing pressure by throttling. Widely applied in the technical field of equipment. Conventional electronic expansion valves are complicated to install, reducing the reliability and stability of the electronic expansion valve.

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

[0005] Technical aspects of the present 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 for guiding movement of the spindle assembly is provided inside the valve body. provided in the guide sleeve, the screw assembly is connected to the rotor assembly, the stator assembly can act on the rotor assembly to drive rotation of the rotor assembly, the screw assembly can be moved by rotation of the rotor assembly, and the stator assembly can act on the rotor assembly to drive the rotation of the rotor assembly, and the screw assembly can be moved by the rotation of the rotor assembly; A valve port is opened in the body, a spindle assembly is driven by a screw assembly to open and close the valve port, and a sleeve is provided to cover one end of the valve body remote from the valve port.

[0007] The details of one or more implementations of the application are set forth in the drawings and description below. Other features, objects, and advantages of the present application will be apparent from the specification, drawings, and claims. At the same time, however, it is necessary to ensure that part of the embodiments contains expressions that correspond to the original technical effects and advantages.

[0008] FIG. 2 is a perspective view of an electronic expansion valve provided by one embodiment. [0009] FIG. 2 is a cross-sectional view of an electronic expansion valve provided by one embodiment. [0010] FIG. 3 is a perspective view of an electronic expansion valve provided by another embodiment. [0011] FIG. 4 is a cross-sectional view of the electronic expansion valve provided by FIG. 3; [0012] FIG. 2 is a cross-sectional view of a valve body provided by one embodiment. [0013] FIG. 3 is a cross-sectional view of a valve body provided with a second mounting step provided by one embodiment. [0014] FIG. 4 is a cross-sectional view of a valve body provided by another embodiment. [0015] FIG. 3 is a cross-sectional view of a valve body provided with a debris retention structure provided by one embodiment. [0016] FIG. 9 is an enlarged view at B provided by FIG. 8; [0017] FIG. 3 is a cross-sectional view of a valve body provided with a position limiter provided by one embodiment. [0018] FIG. 11 is an enlarged view at C provided by FIG. 10; [0019] FIG. 4 is a cross-sectional view of a debris storage structure provided by another embodiment. [0020] FIG. 13 is an enlarged view at D provided by FIG. [0021] FIG. 3 is a cross-sectional view of a guide sleeve provided by one embodiment. [0022] FIG. 4 is a cross-sectional view of a guide sleeve provided by another embodiment. [0023] FIG. 7 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. [0025] FIG. 3 is a perspective view of a screw assembly provided by one embodiment. [0026] FIG. 3 is a cross-sectional view of a spindle assembly and screw assembly provided by one embodiment. [0027] FIG. 4 is a cross-sectional view of an electronic expansion valve provided by another embodiment. [0028] FIG. 21 is a cross-sectional view of the spindle assembly provided by FIG. 20; [0029] FIG. 3 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 provided with an accommodation chamber provided by one embodiment. [0031] FIG. 3 is a cross-sectional view of a noise reduction module provided by one embodiment. [0032] FIG. 4 is a cross-sectional view of a noise reduction module provided by another embodiment. [0033] FIG. 7 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] FIG. 28 is an enlarged view at E provided by FIG. [0036] FIG. 5 is an enlarged view at A provided by FIG. 4; [0037] FIG. 4 is a cross-sectional view of a guide sleeve provided by one embodiment. [0038] FIG. 4 is a perspective view of a connecting hand provided by one embodiment. [0039] FIG. 3 is a top view of a connecting hand provided by one embodiment. [0040] FIG. 4 is a perspective view of a nut sleeve provided by one embodiment. [0041] FIG. 4 is a cross-sectional view of a nut sleeve provided by one embodiment.

[0042] In the figure, an electronic expansion valve 100, a medium inlet pipe 101, a medium outlet pipe 102, an axis 103, a first end 104 of the valve body, a second end 105 of the valve body, a first chamfer 106, a second chamfer 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 port 11, valve chamber 12, through hole 13, Attachment chamber 14, first positioning step 14a, position limiter 141, inner surface 141a of position limiter, outer surface 141b of position limiter, opening 142, connection chamber 15, attachment seat 110, attachment hole 111, guide sleeve 16 , guide hole 16a, spindle hole 16b, plane 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 part 122a, first 2 waste storage groove 123, second waste guide structure 124, second waste guide part 124a, spindle assembly 20, spindle sleeve 21, spindle 22, groove 221, first spring seat 23, second spring seat 24, elastic member 25 , guide holder 26, ball 27, screw assembly 30, screw 31, second projection 311, nut sleeve 32, first end 32a of the nut sleeve, second end 32b of the nut sleeve, locking groove 32c, engagement step 321, Engagement hole 321a, second positioning step 322, stop shoulder 323, sleeve 40, rotor assembly 50, rotor 51, adapter plate 52, position limiting member 53, spring 531, stop portion 531a, stop ring 532, guide piece 54, noise Reduction module 60, third protrusion 61, noise reduction hole 62, first hole 621, second hole 622, third hole 623, cylindrical hole 621a, tapered hole 622a, welded structure 70, fourth protrusion 71, convex side 72 , third chamfer 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 They are a hole 821, a fourth equalization hole 822, and a fifth equalization hole 823.

[0043] The present application will be described in more detail below in conjunction with 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 this embodiment, the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for exchanging cold heat in an air conditioning refrigeration system, and the electronic expansion valve 100 compresses high temperature and high pressure liquid refrigerant into low temperature and low pressure gas-liquid two-phase refrigerant. It is used to reduce pressure and exchange heat, achieving the purpose of refrigeration.

[0045] 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). 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, the stator assembly is provided in the sleeve 40, The stator assembly is energized to generate a magnetic field, causing the rotor assembly 50 to rotate under the influence of this magnetic force, which causes the rotor assembly 50 to move the screw assembly 30, which causes the screw assembly 30 to move the spindle assembly 20, which in turn causes the electronic expansion valve to move. 100 openings and closings to achieve the purpose of regulating flow rate and pressure.

[0046] As shown in FIG. 5, the valve body 10 is manufactured by processing stainless steel. Of course, the valve body 10 may be manufactured using other materials. In this embodiment, examples are not given one by one. Valve body 10 has a generally cylindrical shape; in other embodiments, valve body 10 may have other shapes.

[0047] The valve body 10 has an axis 103, and the valve port 11, the valve chamber 12, the through hole 13, the attachment chamber 14, and the connection chamber 15 are sequentially opened on the valve body 10 along the axis 103. The valve port 11 is used for the extension and retraction of the spindle assembly 20, thereby controlling the flow rate of the fluid medium at the valve port 11, and when the spindle assembly 20 closes the valve port 11, i.e., 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 against the valve port 11, that is, when the valve port 11 and the valve chamber 12 are in communication with each other. Electronic expansion valve 100 is opened. The through hole 13 is opened at the bottom of the attachment chamber 14 , and the diameter of the through hole 13 is smaller than the inner diameter of the attachment chamber 14 . It should be understood that by installing the through hole 13, an annular first positioning step 14a is formed at the bottom of the attachment chamber 14, and the attachment chamber 14 and the connection chamber 15 are communicated with each other along the axis 103 direction.

[0048] The valve body 10 is provided with an inlet 10a and an outlet 10b through which a fluid medium enters. The valve port 11 is provided between the inlet 10a and the outlet 10b, the inlet 10a is placed in communication with the valve chamber 12, the outlet 10b is communicated with the valve port 11, and by controlling the movement of the spindle assembly 20, Conductivity or isolation between the inlet 10a and the outlet 10b is realized.

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

[0050] Furthermore, as shown in FIG. 6, a first protrusion 18 for attaching a medium outlet pipe 102 is provided protrudingly at one end of the valve body 10 remote from the sleeve 40, and the outlet 10b extends along the axis 103. The outlet 10b passes through the first protrusion 18 and communicates with the valve port 11, and in this embodiment, the medium outlet pipe 102 is welded to the valve body.

[0051] Preferably, a connecting groove 19 is formed at one end of the valve body 10 remote 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 connected to the first protrusion 18. The connecting groove 19 is brought into contact with the bottom of the connecting groove 19. By providing the connecting groove 19, it is possible to facilitate welding of the medium outlet pipe 102 and the valve body 10, prevent solder from flowing out, and improve welding quality.

[0052] The valve body 10 is provided with a guide sleeve 16 and a connecting arm 17. The guide sleeve 16 is mounted within the mounting chamber 14 and is an interference fit therewith. Here, an interference fit means that the size of the inner diameter of the attachment chamber 14 minus the size of the outer diameter of the guide sleeve 16 to be engaged is a negative value. The guide sleeve 16 is used to guide the spindle assembly 20 and move it along the axis 103 of the valve body 10 . The coupling hand 17 is installed within the coupling chamber 15 and is used to attach the screw assembly 30. Preferably, the coupling arm 17 is attached within the coupling chamber 15 by welding.

[0053] Furthermore, a first mounting step 10d is provided on the valve body, the first mounting step 10d is located at one end of the valve body 10 where the connection chamber 15 is opened, and the sleeve 40 is attached to the first mounting step 10d. It is attached.

[0054] In one embodiment, as shown in FIGS. 3, 4, and 6, a mounting seat 110 may be provided on the valve body 10, and the sleeve 40 is attached to the mounting seat 110. One end of the guide sleeve 16 is installed within the mounting chamber 14 and is tightly fitted with the mounting chamber 14, the other end extends from within the mounting chamber 14 and is connected to the screw assembly 30, and the connecting hand 17 is connected to the mounting chamber 14. 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 to be closely connected to the mounting seat 110, a mounting hole 111 is formed in the mounting seat 110, and a portion of the screw assembly 30 extends into the mounting hole 111. , connected to the guide sleeve 16.

[0056] In this embodiment, by providing the mounting seat 110, the mounting seat 110 is used for mounting the screw assembly 30 and the sleeve 40 instead of a part of the function of the valve body 10, and thereby The weight of the body 10 can be reduced, the difficulty of machining the valve port 11 in the valve body is reduced, the machining accuracy of the valve body 10 and the valve port 11 is ensured, and the control accuracy of the flow rate 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 have an integral structure or may have a separate structure, and in this embodiment, the valve body 10 and the mounting seat 110 have a separate structure.

[0058] In one embodiment, as shown in FIGS. 10 and 11, one end of the attachment chamber 14 remote from the valve port 11 has a position limiting part 141 in the circumferential direction. The engaging portion 161 is engaged with the position limiting portion 141 and is used to position the guide sleeve 16 along the axis 103 direction, thereby allowing the guide sleeve 16 to maintain the high pressure of the fluid medium and the high pressure of the fluid medium. This prevents noise from being loosened along the axis 103 due to factors such as high/low temperature.

[0059] Furthermore, the position restricting part 141 has an annular shape, and the inner diameter of the position restricting part 141 is smaller than the inner diameter of the attachment chamber 14. Preferably, the cross section of the position limiter 141 along the plane where the axis X exists is trapezoidal or arcuate. One end of the position limiter 141 with a larger inner diameter is provided close to the attachment chamber 14 , and one end of the position limiter 141 with a smaller inner diameter is provided away from the attachment chamber 14 .

[0060] The position limiter 141 has an inner surface 141a and an outer surface 141b, which are provided to be opposed to each other and come into contact with the guide sleeve 16. An included angle a is formed between the inner surface 141a of the position limiting portion and the inner wall of the mounting chamber 14. It is understood that forming the included angle a between the inner surface 141a of the position limiter and the inner wall of the mounting chamber 14 corresponds to forming a shaft collar that limits the movement of the guide sleeve 16 along the X-axis. I want to be

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

[0062] The position limiter 141 may be integrated 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, processing and manufacturing of the valve body 10 becomes easier, and manufacturing costs are reduced. Providing the position limiting portion 141 and the valve body 10 separately makes it easier to attach the guide sleeve 16. Each of the two types of installation methods for the position restriction section 141 and the valve body 10 described above has advantages, and a specific installation method for the position restriction section 141 can be determined according to actual demand.

[0063]Of course, in other embodiments, the position limiter 141 can be provided as a stopper. At this time, the included angle between the stopper and the valve body 10 may be 90 degrees. The stopper has an annular shape and is attached within the connection chamber 15 with a locking member such as a bolt.

[0064] As shown in FIG. 14, the guide sleeve 16 is made of brass material, that is, it is a brass guide sleeve, and the guide sleeve made of brass material is relatively soft, and the guide sleeve 16 and the screw assembly 30 or valve body 10 can be easily attached to each other, and noise caused by collision between the fluid medium and the guide sleeve 16 can be reduced. It is understood that in other embodiments, guide sleeve 16 may be fabricated from other materials 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 one end surface of the guide sleeve 16 near the valve port 11 has a flat surface 161. Here, since the plane 161 is a smooth surface or smooth surface, that is, the coefficient of friction of the plane 161 is low, when the fluid medium passes through the plane 161, it can flow along the plane 161, reducing fluid noise. further reduced.

[0066] The guide sleeve 16 has an axis Y, and a guide hole 16a and a spindle hole 16b are formed along the axis Y. The diameter of the spindle hole 16b is smaller than the 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.

[0067] 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 moved inside the guide hole 16a. It should be understood that the spindle 16 is attached to and moves under the guidance of the guide hole 16a and the spindle hole 16b.

Furthermore, as shown in FIGS. 4 and 12, the guide sleeve 16 can have a three-stage structure, and in this embodiment, the guide sleeve 16 has a first cylindrical stage 162 installed in the mounting chamber 14. , a second cylindrical stage 163 for extending into the mounting hole 111 and for engaging the screw assembly 30, and a third cylindrical stage 164 located within the valve chamber 12; 16 may have a two-stage structure.

[0069] The first cylindrical stage 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 overlap in the process of mounting the guide sleeve 16. This ensures coaxiality between the guide sleeve 16 and the valve port 11.

[0070] Preferably, the first cylindrical stage 162 is a middle stage, that is, located between the second cylindrical stage 163 and the third cylindrical stage 164, and the outer diameter of the first cylindrical stage 162 is smaller than that of the second cylindrical stage. 163 and the outer diameter of the third cylindrical stage 164. A step 162a is formed between the first cylindrical step 162 and the second cylindrical step 163 and the third cylindrical step 164, and the step 162a between the first cylindrical step 162 and the second cylindrical step 163 is formed in the mounting chamber. It should be understood that the second cylindrical step 163 is engaged with the first positioning step 14a at the bottom of the cylindrical step 14 to achieve the positioning of the second cylindrical step 163.

[0071] Further, in one embodiment, the first cylindrical stage 162 has a first end 162b and a second end 162c that are oppositely provided, and the second cylindrical stage 163 has a second end 162b and a second end 162c that are oppositely provided. It is connected to end 162c. The end face of the first end 162b of the first cylindrical stage is a flat surface 161. Axis Y is perpendicular to plane 161. Since the end surface of the first end 162b of the first cylindrical stage is a flat surface 161, the frictional force of the contact between the fluid medium and the second cylindrical stage 163 can be reduced, further reducing the generation of noise, and Improve comfort of use.

[0072] Preferably, the end surface of the first end 162b of the first cylindrical stage is brought into contact with the bottom of the attachment chamber 14 to achieve attachment of the guide sleeve 16. Furthermore, the first end 162b of the first cylindrical stage has a guiding 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 stage 163 remote from the first cylindrical stage 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 165a is a fillet guide or a conical guide. Of course, in other embodiments the guiding structure 165 may have other structures.

[0074] As shown in FIG. 15, in another embodiment, the structure of the guide sleeve 16 basically corresponds to the structure of the guide sleeve 16 in the previously described embodiments, and The difference is that a cam 166 is provided on the end surface of one end 162b, and that the end surface of the one end remote from the first cylindrical stage of the cam 166 is a flat surface 161. The cam 166 extends into the through hole 13, and the flat surface 161 abuts the first positioning step 14a, thereby realizing the positioning and attachment of the guide sleeve 16.

[0075] As shown in FIG. 16, in yet another embodiment, the structure of the guide sleeve 16 basically corresponds to the structure of the guide sleeve 16 in the previously described embodiments, and A third cylindrical stage 164 is provided at the first end 162b, the third cylindrical stage 164 and the valve port 11 are provided at a distance from each other, and one end of the third cylindrical stage 164 remote from the first cylindrical stage 162 is a flat surface 161. They are different 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 stage 164 extends into the valve chamber 12 from the through hole 13 . Preferably, the third cylindrical step 164 is stepped.

[0076] Further, the length of the second cylindrical stage 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 engage with the screw assembly 30 with sufficient engagement size, improving the reliability of the connection and reducing 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 is increased, and the spindle assembly 20 is mounted within the guide hole 16a, improving the overall coaxiality of the spindle assembly 20.

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

[0078] One end of the third cylindrical stage 164 remote from the first cylindrical stage 162 also has a guiding 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 chamfer or a tapered surface provided on the first cylindrical stage 162 and the third cylindrical stage 164.

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

Furthermore, as shown in FIG. 8, a debris storage structure 120 is provided between the valve body 10 and the guide sleeve 16, and the debris 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 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 installation process of the guide sleeve 16. .

[0081] In one embodiment, as shown in FIG. 9, the attachment 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 attachment chamber 14. .

[0082] Preferably, a plurality of first debris storage grooves 121 may be provided, and the plurality of first debris storage grooves 121 are provided at intervals on the inner wall of the attachment chamber 14 along the axis X of the valve body 10. It will be done. Each of the groove mouths of the first debris storage groove 121 has a first debris guide structure 122, thereby guiding debris on the valve body 10 and the guide sleeve 16 into the first debris storage groove 121.

[0083] Specifically, the first debris guide structure 122 includes a first debris guide part 122a provided on the inner wall of the attachment chamber 14, and the first debris guide part 122a is connected to the groove opening of the first debris storage groove 121. Located in Preferably, the first waste guide 122a is located at an inclined waste guide, a fillet waste guide, or the like.

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

[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. Contains 123.

[0086] Preferably, the second waste storage groove 123 is provided on the outer wall of the first cylindrical stage 162. Furthermore, the second waste storage groove 123 is provided close to the second end 162c of the first cylindrical stage 162. That is, it will be appreciated that the second end 162c of the first cylindrical stage 162 is provided as an interference fit stage with the short fitting chamber 14 to reduce extrusion of debris.

[0087] Furthermore, 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 stage 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 , which guides the waste on the valve body 10 and the guide sleeve 16 into the second waste storage groove 123 .

Specifically, the second waste guide structure 124 includes a second waste guide part 124a provided on the outer wall of the guide sleeve 16, and the second waste guide part 124a is connected to the groove opening of the second waste storage groove 123. Located in Preferably, the second waste guide part 124a is provided in an inclined waste guide part, a fillet waste guide part, or the like.

[0089] In yet another embodiment, the attachment chamber 14 has an inner wall, the guide sleeve 16 has an outer wall, and the waste storage structure 120 has the first waste storage groove 121 in Example 1 and the first waste storage groove 121 in Example 2. A second waste storage groove 123 is included. The first waste storage groove 121 on the inner wall of the attachment chamber 14 and the second waste storage groove 123 on the outer wall of the guide sleeve 16 are provided 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 includes a spindle sleeve 21 mounted within the guide sleeve 16 and a spindle 22 mounted within the spindle sleeve 21. The spindle 22 has an axis, and the axis of the spindle 22 is provided to overlap with the axis 103 of the valve body 10. One end of the spindle 22 is connected to a screw assembly 30, and the other end is engaged with the valve port 11, and the screw assembly 30 controls the opening and closing of the electronic expansion valve 100 by moving the spindle 22 and controlling the opening and closing of the valve port 11. 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, second spring seat 24, and elastic member 25 are connected to the spindle sleeve. 21, the first spring seat 23 is connected to the screw assembly 30 and abuts the guide holder 26, one end of the elastic member 25 abuts the first spring seat 23, and the other end abuts the second spring seat 23. The guide holder 26 is attached to one end of the spindle sleeve 21 remote from the spindle 22 and abuts 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 is housed within the spindle sleeve 21, the ball 27 is provided between the spindle 22 and the screw assembly 30, and the ball 27 is provided between the spindle 22 and the screw assembly 30. By reducing the area of frictional contact surfaces of the spindle 22, screw assembly 30, wear is reduced and the reliability and stability of the electronic expansion valve 100 is 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. 22 is provided with a groove 221, the ball 27 is installed in the groove 221, and the ball 27 and the spindle 22 are welded together by spot welding. Here, by providing the ball 27, the second spring seat 24 and the spindle 22 come into point contact, thereby reducing the area of the frictional contact surface between the second spring seat 24 and the spindle 22, and thereby reducing the frictional contact surface area between the second spring seat 24 and the spindle 22. 24 and the spindle 22, thereby improving the reliability and stability of the electronic expansion valve 100.

[0094] As shown in FIGS. 19, 33, and 34, the screw assembly 30 includes a screw 31 and a nut sleeve 32, and the screw 31 has a first end and a second end that are oppositely provided. , one end of the screw 31 is connected to the rotor assembly 50 , a second end of the screw 31 is bored through the nut sleeve 32 and connected to the first spring seat 23 , and the second end of the screw 31 and the nut sleeve 32 are connected to each other. is threadedly connected to the nut sleeve 32, and one end of the nut sleeve 32 is attached to the connecting arm 17.

[0095] Furthermore, the nut sleeve 32 has a first end 32a and a second end 32b provided oppositely, the first end 32a of the nut sleeve is attached to the connecting hand 17, and the second end of the nut sleeve 32b is housed within the sleeve 40. An engagement step 321 extends from the first end 32 a of the nut sleeve and extends into the mounting hole 111 and is provided adjacent to the first cylindrical step 162 .

[0096] Preferably, a locking groove 32c is provided in the first end 32b of the nut sleeve, a locking protrusion is provided in the locking groove 32c, and a corresponding connection hole is provided in the connecting arm 17. , the first end 32b of the nut sleeve is installed in the connection hole and realizes a locking connection with the connecting arm 17 by means of a locking protrusion. When the screw 31 rotates under the drive of the rotor assembly 50, due to the nut-screw engagement relationship formed between the screw 31 and the nut sleeve 32, the screw 31, the rotor assembly 50, etc. fixedly connected to the screw 31, It moves along the axial direction of the screw 31, whereby the screw 31 realizes the movement of the spindle assembly 20.

Furthermore, an engagement hole 321a is opened in the engagement stage 321, and the third cylindrical stage 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 by providing the engagement stage 321, the engagement length between the guide sleeve 16 and the nut sleeve 32 can be extended, 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 threaded connection, an interference fit, or the like. In this embodiment, the third cylindrical stage 164 and the nut sleeve 32 are tightly fitted, so that the nut sleeve 32 is corrected by the third cylindrical stage 164, and the axis of the nut sleeve 32 is aligned with the axis of the guide sleeve 16. It is provided so as to overlap with the axis of the valve body 10.

[0099] In the present embodiment, the first cylindrical stage 162 and the mounting chamber 14 are tightly fitted together, and the third cylindrical stage 164 and the nut sleeve 32 are tightly fitted, so that the first cylindrical stage 162 is connected to the valve body 10. is corrected, the nut sleeve 32 is corrected by the third cylindrical stage 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 port 11 are corrected. It is understood that this reduces the collision between the spindle 22 and the valve body 10 during the movement process, further reduces the wear of the spindle 22 and other members, and improves the service life of the electronic expansion valve 100. Ru.

[00100] A second positioning step 322 may be provided within the nut sleeve 32 , and the third cylindrical step 164 extends into the nut sleeve 32 and abuts the second positioning step 322 , and the third cylindrical step 164 extends into the nut sleeve 32 and abuts the second positioning step 322 . This further improves the reliability of the installation and avoids noises caused by axial movement of the guide sleeve 16 under the pressure of the fluid medium.

[00101] As shown in FIGS. 20 and 21, in another embodiment, the basic structure of the spindle assembly 20 is basically the same as the structure of the spindle assembly 20 described above, and the spindle assembly 20 includes a bearing 211, a gasket 212, and an elastic member 213, the bearing 211 and the gasket 212 are provided at one end of the screw assembly 30 close to the spindle 22, one end of the elastic member 213 is in contact with the gasket 212, and the other end is in contact with the spindle 22. One end of the bearing 211 abuts the screw assembly 30 and the spindle sleeve 21, and the other end contacts the gasket 212, the gasket 212 being housed within the spindle sleeve 21 and contacting the outer ring of the bearing 211. It's 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 aligned with the second protrusion 311. By abutting the inner surface of the spindle sleeve 21 against the outer ring of the bearing 211, the position of the screw 31 and the spindle sleeve 21 relative to the bearing 211 is restricted.

[00103] The screw 31 is fixedly connected to the inner ring of the bearing 211. In this embodiment, the screw 31 and the inner ring of the bearing 211 are fixed to each other by interference fit, 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 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 secured to each other by other connection methods such as caulking, gluing, etc.

[00105] The screw 31 rotates under the drive of the rotor assembly 50, and due to the fixed connection between the screw 31 and the inner ring of the bearing 211, the screw 31 moves and rotates the inner ring of the bearing 211. When the rolling elements in the bearing 211 come into 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 one-point rolling contact in the conventional electronic expansion valve 100 to multi-point rolling contact in this embodiment. Therefore, the contact force is shared by multiple rolling elements, reducing the contact pressure at each contact point, and rolling friction reduces the friction force.

[00106] Furthermore, due to the coaxial mounting of the bearing 211 and the screw 31, the contact force at the rolling element is perpendicular to the direction of gravity of the screw 31, which also reduces the contact force at the contact point in a conventional electronic expansion valve. The stability and reliability of the electronic expansion valve 100 are improved. At the same time, the bearing 211 has play, so that the spindle 22 has a certain degree of freedom, and errors due to the coaxiality of the spindle 22 and the valve port 11 can be reduced.

[00107] In this embodiment, the elastic member 213 is a spring, and in this case, the elastic member 213 has relatively high connection stability. It is understood that in other embodiments, the resilient member 213 may be other types of resilient elements, such as resilient columns.

[00108] With continued reference to FIGS. 4 and 17, the rotor assembly 50 includes a rotor 51 located within the sleeve 40, an adapter plate 52 for attaching the screw 31, and a position for limiting the rotation angle of the rotor 51. The rotor 51 includes a limiting member 53 and a guide piece 54 attached to the adapter plate 52, and the rotor 51 is 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 placed over the nut sleeve and a retaining ring 532 attached to the guide piece 54. One end of the spring 531 is connected to the connecting hand 17, and the other end of the spring 531 is connected to the connecting arm 17. A retaining portion 531a is provided, and a retaining ring 532 is wound around a spring 531. Preferably, a stop shoulder 323 is provided on the outer wall of the nut sleeve 32 and is used to engage a stop ring 532 to limit the rotation angle of the rotor 51.

[00110] In one embodiment, as the rotor 51 rotates and moves along the axis 103 to drive the screw 31 and move the spindle 22 to close the valve port 11, the retaining ring 532 moves along the spring 531. During the movement, the stop ring 532 abuts 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 and move the spindle 22 to open the valve port 11, the stop ring 532 moves along the spring 531; The rotation angle of the rotor 51 is limited by contacting the portion 531a, and this becomes the upper limit position of the rotor 51.

[00111] Furthermore, the outer surface of the screw 31 extends outward along the radial direction of the screw 31 to form a protrusion 311, and when the protrusion 311 on the screw 31 comes into contact with the guide sleeve 26, electronic expansion occurs. The lower limit position of the movement of the rotor 51 and screw 31 in the valve 100 is determined.

[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, so that 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. Since the direction of the force coincides with the axial direction of the screw 31, not only the generated vibration and noise are relatively low, but also because the vibration and noise generated by the impact force can be quickly dissipated on the long and straight rod. , the noise generated when the electronic expansion valve 100 switches the operating state of the rotor assembly 50 due to the lower limit position limitation is relatively reduced.

[00113] In one embodiment, the upper limit position of the electronic expansion valve 100 is achieved by the abutment of the stop ring 532 and the stop portion 531a of the spring 531 with each other. As the rotor 51 rotates and moves along the axis 103 to drive the screw 31 and move the spindle 22 to close the valve port 11, the retaining ring 532 moves along the spring 531. The retaining ring 532 is brought into contact with the retaining portion 531a to limit the rotation angle of the rotor 51, and this becomes the upper limit position of the rotor 51 and the screw 31.

[00114] In another embodiment, 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 This is determined by the mutual abutment of the sleeve 40 and one end remote from the sleeve 40 . By adjusting the sizes of the stopper 531a of the spring 531 and the stopper ring 532, the stopper ring 532 can be prevented from coming into contact with the stopper 531a of the spring 531 when the sleeve 40 and the screw 31 are brought into contact. Accordingly, the mutual contact between the screw 31 and the sleeve 40 is set to 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, which is a long and straight rod member, and the direction of the impact force generated by the mechanical collision is The electronic expansion valve 100 is consistent with the axial direction of the screw 31, and not only the generated vibration and noise are relatively low, but also the vibration and noise generated by the impact force can be quickly dissipated on the long and straight rod body. The upper limit position limit relatively reduces noise generated by switching between states of motion of the rotor assembly 50.

[00116] Furthermore, one end of the screw 31 close to the sleeve 40 is curved to match the shape of the inner surface of the sleeve 40, and in this case, the screw 31 and the sleeve 40 have relatively good connection performance.

[00117] In yet another embodiment, the upper limit position of the electronic expansion valve 100 can also be achieved by the guide holder 26 and the nut sleeve 32 abutting against each other, the nut sleeve 32 abutting the guide holder 26 and the guide Since the holder 26 is fixedly connected to the screw 31, the abutment of the nut sleeve 32 against the guide holder 26 can restrict the further separation of the screw 31 from the valve port 11. At this time, by setting the length of the screw 31, when the nut sleeve 32 and the guide holder 26 are brought into contact with each other, the screw 31 and the sleeve 40 are prevented from coming into contact with each other. ensure that the upper limit position of is determined by the contact between the nut sleeve 32 and the guide holder 26.

[00118] The nut sleeve 32 is a rotating member with a large volume, so noise due to impact force generated by mechanical collision is relatively low, and vibrations generated on the nut sleeve 32 and noise due to vibration can be quickly dissipated. Therefore, the noise generated when the electronic expansion valve 100 switches the operating state of the rotor assembly 50 due to the restriction of the upper limit position is relatively reduced.

[00119] If the upper limit position of the electronic expansion valve 100 is not realized by mutual contact between the stop ring 532 and the stop portion 531a of the spring 531, that is, if the electronic expansion valve 100 adopts the embodiment described above, the stop It is understood that ring 532 and spring 531 may be omitted. The structure of the electronic expansion valve 100 in which the retaining 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 that the upper and lower limit positions to which the rotor assembly 50 moves, ie, the upper and lower limit positions to which the screw assembly 30 moves, are not distinguished herein. Ru.

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

[00122] The stator assembly (not shown) includes members such as coils, and is used to generate a magnetic field when energized, and by moving and rotating the rotor 51 under the action of the magnetic force, the screw 31 is rotated. Achieve rotation.

[00123] In this embodiment, the electronic expansion valve 100 is an electric electronic expansion valve, the rotor 51 is a motor rotor made of permanent magnets in a stepping motor, the stator assembly is a motor stator in a stepping motor, and the stator assembly is a motor stator in a stepping motor. receives the logical digital signal provided by the control circuit, and then transmits the signal to the coils of each phase of the motor stator, and the motor rotor, which is made of permanent magnets, generates rotational movement under the influence of the magnetic moment. This provides a movement process in which the stator assembly drives the rotor assembly to rotate.

[00124] The electronic expansion valve 100 of the present application employs an integrated valve seat, and uses the integrated valve seat to integrate the spool valve seat and sleeve holder of a conventional electronic expansion valve. The number of times the valve 100 is assembled in the axial direction is reduced, that is, the possibility that the coaxiality of each part of the electronic expansion valve 100 is reduced due to multiple assembly is reduced, and the coaxiality between each part of the electronic expansion valve 100 is reduced. Furthermore, the number of parts is reduced, the opening performance of the electronic expansion valve 100 can be guaranteed, the installation is more convenient, and the reliability and stability of the entire product are improved.

[00125] Furthermore, as shown in FIG. 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 processing method of cutting from the upper end is adopted, the valve port of the valve body 10 only needs to be tightened once during processing, which reduces the number of times the valve port 11 of the valve body 10 is tightened in the manufacturing process. In other words, 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] In addition, since the valve port 11 is directly opened in the valve body 10, the number of welds required for fixing the valve seat core and the valve body, in which the valve port is opened, is reduced compared to conventional electronic expansion valves. This reduction improves the integrity of the valve body 10 and improves 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 valve port 11 of the spindle 22, which improves the sealing performance within the valve port 11 of the spindle 22, reduces internal leakage of the electronic expansion valve 100, and improves the accuracy of controlling the fluid flow rate of the electronic expansion valve 100. did.

[00128] A second chamfer 107 is provided at one end of the valve port 11 that is remote from the second end 105 of the valve body 10, and by opening the first chamfer 106 and the second chamfer 107, there is burrs are removed, and the fluid medium has smoother flow characteristics when passing through the valve port 11.

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

[00130] Further, to further isolate noise, the thickness of the wall where the valve body 10 and the guide sleeve 16 contact is between 30% and 80% of the radius of the valve body 10. The thickness of the wall where the valve body 10 and the guide sleeve 16 are in contact is 30% to 80% of the radius of the valve body 10, which provides good noise isolation and prevents the flow noise of the fluid medium from entering the inside of the valve body 10. It can be contained. If the wall thickness of the valve body 10 is too small, the noise containment effect will be relatively low; if the wall thickness of the valve body 10 is too large, components such as the spindle assembly 20 will not be fixed within the valve body 10. It is disadvantageous to install the

[00131] Preferably, the thickness of the wall where the valve body 10 and the guide sleeve 16 are in contact is 80% of the radius of the valve body 10.

[00132] As shown in FIG. 22, the noise generated during the use process of the electronic expansion valve 100 is reduced, and the turbulence noise caused by flow instability when the fluid medium passes through the valve port 11 is reduced. In order to do this, 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 stability when the fluid medium flows through the valve port 11. This reduces turbulence noise during the use of the electronic expansion valve 100.

[00133] As shown in FIG. 23, the valve body 10 is provided with a housing chamber 10f that communicates with the valve port 11, and the housing 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 placed over a part of the noise reduction module 60. Moreover, it is brought into contact with the third protrusion 61 . One end of the noise reduction module 60 is in contact with the valve body 10 and the other end is in contact with the medium outlet pipe 102. By welding and fixing the medium outlet pipe 102 and the valve body 10, the noise reduction module 60 is connected to the valve body 10 and the medium. It is sandwiched and fixed between the lead-out pipe 102 and the lead-out pipe 102.

[00134] In other embodiments, the noise reduction module 60 may be secured between the valve body 10 and the media outlet tube 102 using other structures, for example, the media outlet tube 102 is connected to the noise reduction module. It is understood that the third protrusion 61 formed on the noise reduction module 60 may be directly abutted on the other end remote from the valve port 11 of the noise reduction module 60.

[00135] A noise reduction hole 62 is opened in the noise reduction module 60, the noise reduction hole 62 is connected to the terminal end of the valve port 11, and the diameter of the hole communicating with the valve port 11 of the noise reduction hole 62 matches the hole diameter of the valve port 11. This allows the fluid medium to flow smoothly when passing through the valve port 11 and enters the noise reduction hole 62, and to prevent turbulence when the fluid medium passes through the valve port 11 and enters the noise reduction hole 62. Avoid this from occurring.

[00136] In this 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 step hole, and the noise reduction hole 62 gradually expands in the direction away from the valve port 11.

[00138] In this embodiment, the noise reduction hole 62 is a three-stage stepped hole, and includes a first hole 621, a second hole 622, and a third hole 623, and the first hole 621 is a valve hole. 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 diameter of the third hole 623 is larger than the diameter of the second hole 622, and the diameter of the second hole 622 is larger than the diameter of the first hole 621.

[00139] In this embodiment, the first hole 621, the second hole 622, and the The three holes 623 are circular holes having symmetry and are provided coaxially.

[00140] Of course, if we do not take into account turbulence that may occur due to the asymmetry of the structure when the fluid passes through the stepped holes, the centers of each of the first hole 621, the second hole 622, and the third hole 623 A space may be formed between the shafts, and the first hole 621, the second hole 622, and the third hole 623 may have a shape of irregular holes.

[00141] In other embodiments, the noise reduction hole 62 may adopt a two-stage, four-stage, or four-stage or more structure, in which the noise reduction hole 62 gradually increases in the direction away from the valve port 11. It is understood that it is only necessary to form a step hole that expands.

[00142] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be explained below.

[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 step shape, and the fluid medium passes through the noise reduction hole 62. The flow velocity after entering is reduced, the fluid medium suppresses the generation of free shear surface by the gradually expanding noise reduction holes, as a result, the stability of the fluid medium is improved, and the fluid medium reduces turbulence noise. This reduces noise during the use of the electronic expansion valve 100.

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

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

[00146] Opening the cylindrical hole 621a corresponds to increasing the length of the valve port 11, thereby further improving the stability of the fluid medium.

[00147] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be explained below.

[00148] The noise reduction hole 62 is a horn 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, and the fluid medium enters the noise reduction hole 62. The subsequent flow velocity is reduced and the fluid medium suppresses the generation of free shear planes by the gradually expanding noise reduction holes, resulting in improved stability of the fluid medium and the fluid medium generates less turbulence noise. , thereby reducing the noise generated during the use process of the electronic expansion valve 100.

[00149] Referring also to FIG. 26, in yet 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 the noise reduction hole 62 is a straight hole. The diameter of the reduction hole 62 matches the diameter of the valve port 11 .

[00150] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be explained below.

[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 means that 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 at the end of the electronic expansion valve 100 are reduced, thereby improving the stability of the fluid medium and reducing the noise generated during the use process of the electronic expansion valve 100.

[00152] Further, the noise reduction module 60 is modularized and fixed within the valve body 10, and the noise reduction module is provided separately from the valve body 10, since the shape of the electronic expansion valve 100 is already relatively small. There is no need to create a complex-shaped valve port 11 that is even more difficult to process on the complicated valve body 10, and the electronic expansion valve 100 can employ a combination of the standardized valve body 10 and a customized noise reduction module. 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 that contacts the valve body 10, and two adjacent sides of the welding ring 108 are connected to the valve body 10 and the valve body 10, respectively. In contact with the medium outlet pipe 102, the weld ring 108 is used to fill the weld bead 109 between the valve body 10 and the medium outlet pipe 102. The weld ring 108 is melted by high-temperature heating by an external welding device, and flows as a molten filler material into the weld bead 109 formed between the valve body 10 and the medium outlet pipe 102, thereby causing the valve body 10 and the medium to flow together. Welding fixation to the lead-out pipe 102 is realized.

[00154] Further, the electronic expansion valve 100 is further provided with a welding structure 70, which extends along a direction perpendicular to the axis 103 of the valve body 10 at one end of the valve body 10 near the medium outlet pipe 102. The medium outlet pipe 102 and the fourth protrusion 71 are in contact with each other, and the contact surface between the medium outlet pipe 102 and the fourth protrusion 71 is between the valve body 10 and the medium outlet pipe 102. This 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 formation position of the weld bead 109 is provided in the direction away from the contact end surfaces of the weld ring 108 and the valve body 10. The center can be flush with the weld bead 109, and by the center of the weld ring 108 and the weld bead 109 being flush, the weld ring 108 can smoothly flow into the weld bead 109 during welding. Avoided the occurrence of solder creeping and solder falling phenomena.

[00156] The welded structure 70 further includes a convex side 72 provided on the medium outlet pipe 102, and the medium outlet pipe 102 extends from the fourth protrusion 71 along the axis 103 direction of the valve body 10 to form the 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 protrusion 71, and the weld ring 108 enters the weld bead 109 along the convex side 72 in a molten state during welding. As a result, the quality of welding between the valve body 10 and the medium outlet pipe 102 was further improved.

[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 contact, and the third chamfer 73 is formed on the convex side 72 and the outer surface of the medium outlet pipe 102. The welding ring 108 is connected to the valve body 10 through the third chamfer 73. By opening the third chamfer 73, the valve body 10 and the medium outlet pipe 102 form an accommodation space 74 for accommodating the weld ring 108, and this accommodation space has an open structure, so that the weld ring 108 and the medium outlet pipe 102, and the weld ring 108 can also more easily enter into the weld bead 109 during welding.

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

[00159] As shown in FIG. 2, the electronic expansion valve 100 further includes a pressure equalization passage 80, which equalizes the pressure of the medium at the inlet 10a and the pressure inside the electronic expansion valve 100. , which can not only avoid the impact of the fluid medium on the guide sleeve 16 and reduce the noise, but also at the same time, when the pressure of the medium at the inlet 10a changes, the pressure equalization passage 80 is connected to the electronic expansion valve 100. The pressure inside the electronic expansion valve 100 and the pressure at the inlet are quickly equalized to avoid an excessive load on the inside of the electronic expansion valve 100, and to improve the stability of the operation of the electronic expansion valve 100.

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

[00161] Furthermore, as shown in FIG. 12, a pressure equalization passage 80 is opened in the guide sleeve 16, and the pressure equalization passage 80 communicates between the valve chamber 12 and the guide hole 16a. 16a, so that when the valve port 11 is opened, when the fluid medium enters the valve chamber 12, a part of the fluid medium passes through the pressure equalization passage 80 and enters the guide hole 16a. to equalize the pressure between the guide hole 16a and the valve chamber 11, which can not only avoid the impact of the fluid medium on the guide sleeve 16 and reduce noise, but also at the same time, the pressure of the system is changed. At this time, the pressure inside the electronic expansion valve 100 can be quickly equalized, avoiding extra load caused by pressure difference, and improving the stability of the operation of the electronic expansion valve 100.

[00162] In this embodiment, the pressure equalization passage 80 equalizes the pressure between the valve chamber 12 and the guide hole 16a. By equalizing the pressures in the parts, the entire interior of the electronic expansion valve 100 is brought into a state where the pressure is equalized, and a phenomenon in which an extra load is applied to the interior of the electronic expansion valve 100 is avoided.

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

[00164] The pressure equalization hole 80a has an axis, and the axis of the pressure equalization hole 80a is provided parallel to the axis X. That is, the pressure equalization hole 80a is opened perpendicularly to the guide sleeve 16, so that the pressure equalization hole 80a does not affect the direction in which the fluid medium flows, and eliminates noise caused by changes in the flow direction of the fluid medium. It is understood that the exclusion of

Furthermore, the number of pressure equalization holes 80a is two, and the two pressure equalization holes 80a are uniformly distributed in the guide sleeve 16 along the circumferential direction of the axis X. Of course, in this embodiment, the number of pressure equalization holes 80a may be three, four, etc., and the specific number of pressure equalization holes 80a may be set according to actual demand.

[00166] Preferably, each pressure equalization hole 80a is a circular pressure equalization hole. Of course, in other embodiments the pressure equalization hole 80a may have other shapes. For example, the pressure equalization hole 80a is a rectangular or polygonal pressure equalization hole.

[00167] In another embodiment, as shown in FIGS. 4 and 30-34, a pressure equalization passage 80 is provided between the mounting seat 110, the guide sleeve 16 and the nut sleeve 32, and the pressure equalization passage 80 is provided between the inlet 10a and the guide sleeve 32. 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 are communicated with each other so that the pressure of the fluid medium at the inlet 10a and the inside of the guide sleeve 16, the inside of the mounting seat 110, and the nut are communicated with each other. It is used to equalize the pressure of the fluid medium inside the sleeve 32 and inside 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 includes the inlet 10a, the inside of the guide sleeve 16, the inside of the screw assembly 30, and the sleeve. 40 and the second equalization passage 82 is provided to communicate the inside of the mounting seat 110 with the first equalization passage 81. 81 and the second equalization passage 82 allow the inside of the guide sleeve 16, the inside of the mounting seat 110, the inside of the nut sleeve 32, and the inside of the sleeve 40 to communicate with each other. When the fluid medium enters through the inlet 10a, some of the fluid medium passes through the first equalization passage 81 and enters the interior of the guide sleeve 16, the interior of the screw assembly 30 and the interior of the sleeve 40, and enters the second equalization passage. 82 and enters the interior of the mounting seat 110 to equalize the medium pressure at various locations 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 opened in the guide sleeve 16 and is connected to the inside of the guide sleeve and the valve chamber 12. The second equalizing hole 812 is opened in the nut sleeve 32 and is used to communicate the inside of the sleeve 40 and the inside of the nut sleeve 32, thereby making the valve chamber 12 and the inside of the nut sleeve 32 communicate with each other. The interior of the guide sleeve 16, the interior of the nut sleeve 32, and the interior of the sleeve 40 are communicated with each other to achieve the purpose of pressure equalization.

[00170] Further, the first equalizing hole 811 has an axis, and the axis of the first equalizing hole 811 is provided parallel to the axis 103. That is, the first equalizing hole 811 is opened perpendicularly to the guide sleeve 16, so that the first equalizing hole 811 does not affect the direction in which the fluid medium flows, but due to the change in the flow direction of the fluid medium. It is understood that this eliminates noise.

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

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

[00174] The second equalization passage 82 includes a third equalization hole 821, the third equalization hole 821 is opened in the connecting hand 17, and the third equalization hole 821 is connected to the inside of the mounting seat 110 and the mantle 40. At the same time, 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 equalization passage 81 communicate with each other through the third equalization hole 821, and the fluid medium at the inlet 10a passes through the first equalization passage 81 and the third equalization hole 821. It is understood that the interior of the seat 110 is entered.

[00175] Preferably, the third equalizing hole 821 is a slotted hole, and the third equalizing hole 821 is opened along a direction perpendicular to the axis of the valve body. The number of third equalization holes 821 is plural. In this embodiment, the number of third equalizing holes 821 is two, and the two third equalizing holes 821 are provided symmetrically with respect to the axis of the valve body.

[00176] 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, and the fourth equalization hole 822 is located in the guide sleeve. 16, the fifth equalizing hole 823 is opened in the nut sleeve 32, and the fourth equalizing hole 822 communicates with the fifth equalizing hole 823, whereby the fourth equalizing hole 822 and the fifth equalizing hole The hole 823 communicates the inside of the guide sleeve 16 and the inside of the mounting seat 110. Here, by further providing the fourth equalization hole 822 and the fifth equalization hole 823, it is possible to increase the speed of equalization of the medium pressure between the inside of the mounting seat 110 and the inlet 10a.

[00177] Furthermore, 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 Communication between the mounting hole 111 and the guide hole 16a is realized, thereby further realizing communication between the inside of the mounting seat 110 and the first equalization passage 81.

[00178] The fourth equalizing hole 822 has an axis, the fifth equalizing hole 823 has an axis, and the axis of the fourth equalizing hole 822 is provided so as to overlap with the axis of the fifth equalizing hole 823. The axis of the fourth equalizing hole 822 is perpendicular to the axis of the first equalizing hole 811. Of course, in other embodiments, the axis of the fourth equalizing hole 822 may not be provided so as to overlap the axis of the fifth equalizing hole 823, and the axis of the fourth equalizing hole 822 and the fifth equalizing hole 823 may be It is sufficient that communication can be realized, and the axis of the fourth equalizing hole 822 does not need to be perpendicular to the axis of the first equalizing hole 811.

[00179] Each of the technical features of the embodiments described above can be combined in any desired manner, and in order to simplify the explanation, all possible combinations of the technical features of the embodiments described above are not explained. However, unless there is a contradiction in the combination of these technical features, any combination should be considered within the scope described in this specification.

[00180] The examples described above are merely illustrative of some embodiments of the present invention, and although the description thereof is more specific and detailed, it does not limit the scope of the claims of the invention. should not be understood as such. It must be pointed out that for those skilled in the art, several modifications and improvements are possible without departing from the spirit of the invention, and all these fall within the protection scope of the invention. Therefore, the scope of protection of the patent for the present invention shall be subject to the scope of the appended claims.

Claims (10)

An electronic expansion valve, including a valve body, a spindle assembly , a rotor assembly and a screw,
A valve port is bored in the valve body,
The spindle assembly includes a guide holder for guiding movement of the screw, a first spring seat that can come into contact with the guide holder while the screw moves up and down, and an elastic member that comes into contact with the first spring seat. ,
One end of the screw is inserted into the guide holder and connected to the first spring seat , and the other end is inserted into the rotor assembly,
The screw is used to drive movement of the spindle assembly relative to the valve orifice, the screw having a first maximum actuation position moving toward the valve orifice and a second maximum actuation position moving away from the valve orifice. , respectively referred to as the lower limit position and the upper limit position,
An electronic expansion valve, wherein an outer surface of the screw extends outward in a radial direction of the screw to form a protrusion , and a lower limit position of the movement of the screw is determined by contact of a guide holder with the protrusion . The electronic expansion valve according to claim 1, further comprising a sleeve for accommodating a screw, and wherein the upper limit position of the screw is determined by abutment of the sleeve against the screw. 3. The electronic expansion valve of claim 2, wherein the shape of one end of the screw proximate to the top of the sleeve matches the shape of the inner surface of the sleeve. 4. The electronic expansion valve according to claim 3, wherein one end of the screw near the top of the sleeve is curved. The spindle assembly further includes a second spring seat;
The electronic expansion valve according to any one of claims 1 to 4, wherein one end of the elastic member abuts a first spring seat and the other end abuts a second spring seat . The electronic expansion valve further includes a valve body and a nut sleeve in which the screw is rotatably inserted ,
The electronic expansion valve according to any one of claims 1 to 5, wherein the valve body is provided with a connecting hand that is engaged and fixed to the nut sleeve. The electronic expansion valve according to claim 6, wherein the connecting hand is welded and fixed to the valve body. 7. The electronic expansion valve of claim 6, further comprising a stator assembly , the stator assembly being able to act on the rotor assembly to drive rotation of the rotor assembly. 9. The electronic expansion valve of claim 8, wherein the valve body further includes a mounting bracket, and the stator assembly is mounted on the mounting bracket. An air conditioning system comprising an electronic expansion valve according to any one of claims 1 to 9.