KR102668677B1 - Electronic expansion valve - Google Patents

Abstract

The present invention provides an electronic expansion valve (100), which includes a valve body (10), a valve needle assembly (20), a screw rod assembly (30), a rotor assembly (50), and a stator assembly. and sleeve 40. A guide sleeve 16 is installed inside the valve body 10 to guide the valve needle assembly 20 to move, and the valve needle assembly 20 is installed on the guide sleeve 16. The screw rod assembly 30 is connected to the rotor assembly 50, and the stator assembly acts on the rotor assembly 50 to drive the rotor assembly 50 to rotate. Rotation of the electronic assembly 50 may drive the screw rod assembly 30 to move. A valve port 11 is opened on the valve body 10, the valve needle assembly 20 opens and closes the valve port 11 under the driving of the screw rod assembly 30, and the sleeve 40 is It is installed to cover the end of the valve body 10 farthest from the valve port 11.

Description

Electronic expansion valve{ELECTRONIC EXPANSION VALVE}

This application relates to “electronic expansion valve” of application number 2018213376030 filed on August 17, 2018, “electronic expansion valve” of application number 2018213353433 filed on August 17, 2018, and application number 2018213375841 filed on August 17, 2018 "Electronic expansion valve" of Application No. 2018213357716, filed on August 17, 2018, "Electronic expansion valve" of Application No. 2018213352750, filed on August 17, 2018 “Electronic expansion valve” with application number 2018109433995, “Electronic expansion valve and air conditioning system using the electronic expansion valve” with application number 2018109434023, filed on August 17, 2018, application number 2018213355354, filed on August 17, 2018 “Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve”, Application No. 2018109416190, filed on August 17, 2018, “Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve”, August 17, 2018 “Electronic expansion valve and air conditioning system using the electronic expansion valve” filed on August 17, 2018 under application number 2018213352892; “electronic expansion valve and air conditioning system using the electronic expansion valve” filed on August 17, 2018; application number 2018109427462 filed on August 17, 2018; , claims priority to the Chinese patent/design application for "Electronic expansion valve and air conditioning system using said electronic expansion valve" with application number 201821335213X filed on August 17, 2018, which is incorporated herein in its entirety for reference. It has been done.

The present invention relates to the field of refrigeration technology, and more particularly to electronic expansion valves.

The electronic expansion valve achieves the purpose of flow regulation and throttle decompression by opening and closing the valve port on the valve body through the movement of the valve stem assembly within the guide sleeve and nut sleeve, and is widely used in the field of refrigeration equipment technology. Conventional electronic expansion valves are complicated to install, and the reliability and stability of the electronic expansion valves are low.

Based on this, an electronic expansion valve is provided according to various embodiments of the present application.

The technical solution of this application is as follows.

The electronic expansion valve provided in this application includes a valve body, valve needle assembly, screw rod assembly, rotor assembly, stator assembly, and sleeve. A guide sleeve is installed inside the valve body to guide the valve needle assembly to move, and the valve needle assembly is installed on the guide sleeve. The screw rod assembly is connected to the rotor assembly, and the stator assembly acts on the rotor assembly to drive the rotor assembly to rotate, and rotation of the rotor assembly causes the screw rod assembly to move. It can be driven. A valve port is opened on the valve body, and the valve needle assembly opens and closes the valve port under the driving of the screw rod assembly. The sleeve is installed in the valve body to cover an end distal from the valve port.

Details of one or more embodiments according to the present application are provided in the accompanying drawings and description below. Other features, objects and advantages of the present application are clearly described through the specification, accompanying drawings and claims. In addition, descriptions corresponding to the original technical effects and advantages are provided in the examples section.

1 is a perspective view of an electronic expansion valve according to one embodiment.
Figure 2 is a cross-sectional view of an electronic expansion valve according to one embodiment.
Figure 3 is a perspective view of an electronic expansion valve according to another embodiment.
Figure 4 is a cross-sectional view of the electronic expansion valve according to Figure 3;
Figure 5 is a cross-sectional view of the valve body according to one embodiment.
Figure 6 is a cross-sectional view of the valve body on which the second mounting step is installed according to one embodiment.
Figure 7 is a cross-sectional view of the valve body according to another embodiment.
Figure 8 is a cross-sectional view of the valve body with a debris storage structure installed according to one embodiment.
Figure 9 is an enlarged view of B in Figure 8.
Figure 10 is a cross-sectional view of a valve body with a position limiter installed according to an embodiment.
Figure 11 is an enlarged view of C in Figure 10.
Figure 12 is a cross-sectional view of a debris storage structure according to another embodiment.
Figure 13 is an enlarged view of D in Figure 12.
Figure 14 is a cross-sectional view of a guide sleeve according to one embodiment.
Figure 15 is a cross-sectional view of a guide sleeve according to another embodiment.
Figure 16 is a cross-sectional view of a guide sleeve according to another embodiment.
Figure 17 is a perspective view of an electronic expansion valve with the sleeve and valve body omitted, according to one embodiment.
Figure 18 is a perspective view of a screw rod assembly according to one embodiment.
Figure 19 is a cross-sectional view of the valve needle assembly and screw rod assembly according to one embodiment.
Figure 20 is a cross-sectional view of an electronic expansion valve according to another embodiment.
Figure 21 is a cross-sectional view of the valve needle assembly according to Figure 20;
Figure 22 is a cross-sectional view of an electronic expansion valve with a noise reduction module installed according to an embodiment.
Figure 23 is a cross-sectional view of the valve body with the receiving cavity outlined, according to one embodiment.
Figure 24 is a cross-sectional view of a noise reduction module according to one embodiment.
Figure 25 is a cross-sectional view of a noise reduction module according to another embodiment.
Figure 26 is a cross-sectional view of a noise reduction module according to another embodiment.
27 is a cross-sectional view of an electronic expansion valve equipped with a welded structure according to one embodiment.
Figure 28 is an enlarged view of E in Figure 27.
Figure 29 is an enlarged view of A in Figure 4.
Figure 30 is a cross-sectional view of a guide sleeve according to one embodiment.
Figure 31 is a perspective view of a connection piece according to one embodiment.
Figure 32 is a plan view of a connecting piece according to one embodiment.
Figure 33 is a perspective view of a nut sleeve according to one embodiment.
Figure 34 is a cross-sectional view of a nut sleeve according to one embodiment.
In the drawing, 100 is an electronic expansion valve, 101 is a medium inlet pipe, 102 is a medium discharge pipe, 103 is an axis, 104 is the first end of the valve body, 105 is the second end of the valve body, 106 is the first chamfer, and 107 is the first end. 2 chamfer, 108 is a weld ring, 109 is a weld joint, 10 is a valve body, 10a is an inlet, 10b is an outlet, 10c is a mounting bracket, 10d is a first mounting step, 10e is a second mounting step, 10f is a receiving cavity, 11 is the valve port, 12 is the valve cavity, 13 is the through hole, 14 is the mounting cavity, 14a is the first positioning step, 141 is the position limiter, 141a is the inner surface of the position limiter, 141b is the outer surface of the position limiter, 142 is an opening, 15 is a connection cavity, 110 is a mounting seat, 111 is a mounting hole, 16 is a guide sleeve, 16a is a guide hole, 16b is a valve needle hole, 161 is a flat surface, 162 is a first cylindrical section, 162a is a step, 162b is the first stage of the first cylindrical section, 162c is the second stage of the first cylindrical section, 163 is the second cylindrical section, 164 is the third cylindrical section, 165 is the guide structure, 166 is the boss, and 17 is the Connection piece, 18 is a first protrusion, 19 is a connection groove, 120 is a debris storage structure, 121 is a first debris storage groove, 122 is a first debris guide structure, 122a is a first debris guide part, 123 is a second debris storage groove , 124 is a second debris guide structure, 124a is a second debris guide portion, 20 is a valve needle assembly, 21 is a valve needle sleeve, 22 is a valve needle, 221 is a concave groove, 23 is a first spring seat, and 24 is a second spring seat. Spring seat, 25 is an elastic member, 26 is a guide sheet, 27 is a ball, 30 is a screw rod assembly, 31 is a screw rod, 311 is a second protrusion, 32 is a nut sleeve, 32a is the first end of the nut sleeve, 32b is The second end of the nut sleeve, 32c is a clamping groove, 321 is a matching section, 321a is a matching hole, 322 is a second positioning step, 323 is a stop collar, 40 is a sleeve, 50 is a rotor assembly, 51 Silver rotor, 52 is a switching connection board, 53 is a position limiting member, 531 is a spring, 531a is a stop part, 532 is a stop ring, 54 is a movement guide piece, 60 is a noise reduction module, 61 is a third protrusion, 62 is Noise reduction hole, 621 is the first hole, 622 is the second hole, 623 is the third hole, 621a is a cylindrical hole, 622a is a conical hole, 70 is a welded structure, 71 is a fourth protrusion, 72 is a convex edge, and 73 is a convex edge. Third chamfer, 80 is a pressure balance channel, 80a is a pressure balance hole, 81 is a first balance channel, 811 is a first balance hole, 812 is a second balance hole, 82 is a second balance channel, 821 is a third balance hole , 822 is the fourth balance hole, and 823 is the fifth balance hole.

Hereinafter, the present application will be described in more detail with reference to the accompanying drawings and specific examples.

As shown in FIGS. 1 and 2, the present application provides an electronic expansion valve 100. The electronic expansion valve 100 is used to control the flow rate and pressure of the fluid medium in an air-conditioned refrigeration system. In this embodiment, the fluid medium flowing through the electronic expansion valve 100 is a refrigerant used for cold heat exchange in an air-conditioning refrigeration system. The electronic expansion valve 100 performs throttle decompression on the high-temperature, high-pressure liquid refrigerant to form a low-temperature, low-pressure gas-liquid two-phase refrigerant and performs heat exchange to achieve the purpose of refrigeration.

The electronic expansion valve 100 includes a valve body 10, a valve needle assembly 20, a screw rod assembly 30, a sleeve 40, a rotor assembly 50, and a stator assembly (not shown). The valve needle assembly 20, the screw rod assembly 30 and the sleeve 40 are mounted on the valve body 10. One end of the screw rod assembly 30 is connected to the valve needle assembly 20, and the other end is connected to the rotor assembly 50. The rotor assembly (50) is installed within the sleeve (40), and the stator assembly is installed on the sleeve (40). The stator assembly is energized to generate a magnetic field and rotates the rotor assembly 50 under the action of the magnetic field. The rotor assembly 50 drives the screw rod assembly 30 to move, and the screw rod assembly 30 drives the valve needle assembly 20 to move, so that the electronic expansion valve 100 By implementing opening and closing, the purpose of flow and pressure control is achieved.

As shown in Figure 5, the valve body 10 is made of stainless steel. Of course, the valve body 10 can also be manufactured by processing other materials. In this embodiment, these are not listed one by one. The valve body 10 is generally cylindrical. Of course, in other embodiments, the valve body 10 may have a different shape.

The valve body 10 has an axis 103, and on the valve body 10, a valve port 11, a valve cavity 12, a hole 13, and a mounting cavity are sequentially formed along the axis 103. 14) and the connection cavity 15 are opened. The valve port 11 is used to control the flow rate of the fluid medium in the valve port 11 by extending the valve needle assembly 20. When the valve needle assembly 20 closes the valve port 11, that is, when communication between the valve port 11 and the valve cavity 12 is blocked, the electronic expansion valve 100 is closed. On the other hand, when the valve needle assembly 20 releases the seal on the valve port 11, that is, when the valve port 11 and the valve cavity 12 communicate, the electronic expansion valve 100 opens. The through hole 13 is opened in the bottom of the mounting cavity 14, and the diameter of the through hole 13 is smaller than the inner diameter of the mounting cavity 14. Installation of the through hole 13 causes the bottom of the mounting cavity 14 to form a ring-shaped first positioning step 14a, and the mounting cavity 14 and the connecting cavity 15 are aligned with the axis 103. We can understand that they communicate with each other according to direction.

An inlet 10a and an outlet 10b through which the fluid medium flows are further provided on the valve body 10. The valve port 11 is installed between the inlet 10a and the outlet 10b, and the inlet 10a is installed to communicate with the valve cavity 12. The outlet 10b communicates with the valve port 11 to control the movement of the valve needle assembly 20, thereby implementing continuity or closure between the inlet 10a and the outlet 10b.

Preferably, a medium inlet pipe 101 for transporting a fluid medium is installed at the inlet 10a, and a medium discharge pipe 102 for transporting a fluid medium is installed at 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, and is decompressed through a throttle by the electronic expansion valve 100. It is discharged from the discharge pipe 102.

Also, as shown in FIG. 6, a first protrusion 18 for mounting the medium discharge pipe 102 is installed convexly at one end of the valve body 10 farthest from the sleeve 40. The outlet 10b passes through the first protrusion 18 along the axis 103, and the outlet 10b communicates with the valve port 11. In this embodiment, the medium discharge pipe 102 and the valve body are connected by welding.

Preferably, the valve body 10 has a connection groove 19 formed at one end distal from the sleeve 40, and the first protrusion 18 is located at the bottom of the connection groove 19, One end of the medium discharge pipe 102 is installed to cover the first protrusion 18 and comes into contact with the bottom of the connection groove 19. Here, through the installation of the connection groove 19, the medium discharge pipe 102 and the valve body 10 can be easily welded, and the welding quality can be improved by preventing solder from leaking.

A guide sleeve 16 and a connection piece 17 are installed on the valve body 10. The guide sleeve 16 is mounted in the mounting cavity 14 and is tightly fitted with the mounting cavity 14. Here, the interference fit means that the size of the inner diameter of the mounting cavity 14 minus the size of the matched outer diameter of the guide sleeve 16 is a negative value. The guide sleeve 16 is used to guide the valve needle assembly 20 to move along the axis 103 of the valve body 10. The connecting piece 17 is mounted within the connecting cavity 15 and is used to mount the screw rod assembly 30. Preferably, the connecting piece 17 is mounted in the connecting cavity 15 by welding.

In addition, a first mounting step 10d is installed on the valve body, and the first mounting step 10d is located at one end of the valve body 10 where the connection cavity 15 is opened, and the sleeve 40 is mounted on the first mounting step 10d.

In one embodiment, as shown in FIGS. 3, 4, and 6, a mounting sheet 110 may be installed on the valve body 10, and the sleeve 40 may be installed on the mounting sheet 110. ) is mounted on the One end of the guide sleeve 16 is mounted within the mounting cavity 14 and is tightly fitted with the mounting cavity 14, and the other end extends from within the mounting cavity 14 to form the screw rod assembly 30. is connected to, and the connecting piece 17 is mounted on the mounting sheet 110.

Additionally, the mounting sheet 110 generally has a cylindrical shape, and the mounting sheet 110 is welded on the valve body 10 by a welding method. Of course, in other embodiments, the mounting seat 110 may be connected to the valve body 10 by other methods. The sleeve 40 is welded onto the mounting sheet 110 by a welding method and is sealedly connected to the mounting sheet 110. A mounting hole 111 is opened on the mounting sheet 110, and a portion of the screw rod assembly 30 extends into the mounting hole 111 and is connected to the guide sleeve 16.

In this embodiment, the mounting sheet 110 is used to install the screw rod assembly 30 and the sleeve 40 by replacing some functions of the valve body 10 with the mounting sheet 110. do. Through this, it is possible to reduce the weight of the valve body 10 and reduce the difficulty of processing the valve port 11 on the valve body. In addition, the processing precision of the valve body 10 and the valve port 11 is ensured and the control precision of the flow rate of the electronic expansion valve 100 is improved.

Preferably, a second mounting step 10e is installed on the valve body 10, and the mounting sheet 110 is welded on the second mounting step 10e. The valve body 10 and the mounting seat 110 may adopt an integrated structure or a separate structure. In this embodiment, the valve body 10 and the mounting seat 110 adopt a separate structure.

In one embodiment, as shown in FIGS. 10 and 14, the mounting cavity 14 is provided with a position limiting portion 141 in the circumferential direction at one end distal from the valve port 11. The step 162a is used to match the position limiter 141 so that the guide sleeve 16 is positioned along the axis 103. This prevents the guide sleeve 16 from loosening along the axis 103 and generating noise under factors such as high pressure of the fluid medium and high/low temperature of the fluid medium.

Additionally, the position limiting part 141 is ring-shaped, and the inner diameter of the position limiting part 141 is smaller than the inner diameter of the mounting cavity 14. Preferably, the position limiting portion 141 has a trapezoid or arc shape along the cross section of the plane where the axis X is located. One end of the position limiting part 141 with a larger inner diameter is installed close to the mounting cavity 14, and one end of the position limiting part 141 with a smaller inner diameter is installed away from the mounting cavity 14.

The position limiting portion 141 is installed oppositely and has an inner surface 141a and an outer surface 141b used to come into contact with the guide sleeve 16. A narrow angle (a) is formed between the inner surface (141a) of the position limiting portion and the inner wall of the mounting cavity (14). The included angle (α) formed between the inner surface 141a of the position limiting portion and the inner wall of the mounting cavity 14 corresponds to forming an axial shoulder that limits the movement of the guide sleeve 16 in the X-axis direction. You must understand.

Preferably, the range of the included angle (a) is 120°≤a≤160°. Therefore, within the above angle range, the guide sleeve 16 can not only be installed in the mounting cavity 14, but also the movement of the guide sleeve 16 in the X-axis direction can be restricted. Specifically, in this embodiment, the included angle is a=160°.

The position limiter 141 may be integrated with the valve body 10, or may be installed separately from the valve body 10. If the position limiting part 141 and the valve body 10 are installed in an integrated structure, processing and manufacturing of the valve body 10 can be facilitated and production costs can be reduced. If the position limiting part 141 and the valve body 10 are installed in a separate structure, the guide sleeve 16 can be easily installed. Since the above-mentioned two installation methods of the position limiting part 141 and the valve body 10 each have their own advantages, the specific installation method of the position limiting part 141 can be determined according to actual needs.

Of course, in another embodiment, the position limiting part 141 may be installed as a stopper. Here, the included angle between the stopper and the valve body 10 may be 90°. The stopper is ring-shaped, and the stopper is mounted in the connection cavity 15 by a locking member such as a bolt.

As shown in Figure 14, the guide sleeve 16 is manufactured by processing a brass material, that is, a brass guide sleeve. Since the guide sleeve, which is made of brass, is relatively soft, it is easy to install between the guide sleeve 16 and the screw rod assembly 30 or the valve body 10, and prevents damage due to collision between the fluid medium and the guide sleeve 16. Noise can be reduced. In another embodiment, it can be understood that the guide sleeve 16 may be manufactured by processing a material other than brass.

The guide sleeve 16 generally has a cylindrical shape, the guide sleeve 16 and the valve port 11 are installed spaced apart, and the guide sleeve 16 has a cross section at one end close to the valve port 11. This is plane 161. Here, the plane 161 is a smooth surface or smooth surface. That is, because the friction coefficient of the plane 161 is relatively low, the fluid medium flows along the plane 161 when it passes through the plane 161, thereby further reducing fluid noise.

The guide sleeve 16 has an axis Y, and a guide hole 16a and a valve needle hole 16b are opened along the axis Y on the guide sleeve 16. The diameter of the valve needle hole 16b is smaller than the diameter of the guide hole 16a. The valve needle hole 16b is located at the bottom of the guide hole 16a and communicates with the guide hole 16a.

Since the diameter of the valve needle hole 16b is smaller than the diameter of the guide hole 16a, the bottom of the guide hole 16a is coupled to the valve needle hole 16b to form a position limiting step 161a. , it can be understood that the valve needle assembly 20 is mounted in the guide hole 16a and moves under the guidance of the guide hole 16a and the valve needle hole 16b.

Also, as shown in FIGS. 4 and 12, the guide sleeve 16 may have a three-stage structure. In this embodiment, the guide sleeve 16 extends into the first cylindrical section 162 mounted in the mounting cavity 14 and the mounting hole 111 to match the screw rod assembly 30. It includes a second cylindrical section 163 used for, and a third cylindrical section 164 located within the valve cavity 12. In another embodiment, the guide sleeve 16 may have a two-stage structure.

There is an interference fit between the first cylindrical section 162 and the mounting cavity 14, so that during the mounting process of the guide sleeve 16, the axis of the guide sleeve 16 itself is aligned with the axis of the valve body 10 ( Y) ensures coaxiality between the guide sleeve 16 and the valve port 11.

Preferably, the first cylindrical section 162 is located in the middle section, that is, between the second cylindrical section 163 and the third cylindrical section 164. The outer diameter of the first cylindrical section 162 is larger than the outer diameter of the second cylindrical section 163 and the third cylindrical section 164, respectively. The first cylindrical section 162 forms a step 162a with the second cylindrical section 163 and the third cylindrical section 164, respectively, and the first cylindrical section 162 and the third cylindrical section 162 The step 162a between 164 is matched with the first positioning step 14a of the bottom of the mounting cavity 14 to implement positioning of the second cylindrical section 163.

In addition, in one embodiment, the first cylindrical section 162 has a first end 162b and a second end 162c installed opposite each other, and the second cylindrical section 163 is the first cylindrical section 162. It is connected to the second stage (162c). The cross section of the first end 162b in the first cylindrical section is a plane 161. The axis Y is perpendicular to the plane 161. Since the cross-section of the first stage 162b in the first cylindrical section is flat 161, the contact friction between the fluid medium and the second cylindrical section 163 is reduced, thereby reducing noise generation and user experience. This can be improved.

Preferably, the cross section of the first end 162b in the first cylindrical section abuts the bottom of the mounting cavity 14 to implement mounting of the guide sleeve 16. Additionally, the first end 162b of the first cylindrical section has a guide structure 165 in the circumferential direction. Here, installation of the guide sleeve 16 can be facilitated through installation of the guide structure 165. Additionally, one end of the second cylindrical section 163 that is far from the first cylindrical section 162 also has the guide structure 165a in the circumferential direction.

Specifically, the guide structure 165 includes a guide portion 165a installed at the second end 162c of the first cylindrical section. Preferably, the guide portion 165a is a fillet guide portion or a cone guide portion. Of course, in other embodiments, the guide structure 165 may have a different structure.

As shown in FIG. 15, the structure of the guide sleeve 16 in another embodiment is basically the same as the structure of the guide sleeve 16 in the above embodiment. However, the difference is that the boss 166 is installed on the cross section of the first end 162b in the first cylindrical section, and the cross section of the boss 166 farthest from the first cylindrical section is the plane 161. There is. The boss 166 extends into the through hole 13, and the plane 161 abuts on the first positioning step 14a to realize positioning and installation of the guide sleeve 16.

As shown in FIG. 16, the structure of the guide sleeve 16 in another embodiment is basically the same as the structure of the guide sleeve 16 in the above embodiment. However, the third cylindrical section 164 is installed at the first end 162b of the first cylindrical section, the third cylindrical section 164 and the valve port 11 are installed to be spaced apart, and the third cylindrical section 164 is installed at a distance from the valve port 11. There is a difference in that the end of the cylindrical section 164 farthest from the first cylindrical section 162 is the plane 161. The outer diameter of the third cylindrical section 164 is smaller than the outer diameter of the second cylindrical section 163, and the step 162a is also formed between the second cylindrical section 163 and the second cylindrical section 163. The third cylindrical section 164 extends from the through hole 13 into the valve cavity 12. Preferably, the third cylindrical section 164 has a stepped shape.

Additionally, the length of the second cylindrical section 163 is 1/4 to 1/3 times the length of the guide sleeve. Here, the length of the second cylindrical section 163 is 1/4 to 1/3 times the length of the guide sleeve. Therefore, it can be understood that the guide sleeve 16 can have a size sufficient to match the screw rod assembly 30, connection reliability is improved, and the risk of the guide sleeve 16 loosening due to vibration reduction is also reduced. . Of course, as the third cylindrical section 164 becomes longer, the total length of the guide hole 16a increases. The valve needle assembly 20 is mounted within the guide hole 16a, thereby improving the overall coaxiality of the valve needle assembly 20.

Preferably, the length of the second cylindrical section 163 is 3/10 times the length of the guide sleeve 16. Since the length of the second cylindrical section 163 generally occupies 1/3 times the length of the guide sleeve 16, the connection reliability between the second cylindrical section 163 and the screw rod assembly 30 is more reliable. I can understand that it is improving.

The third cylindrical section 164 also has a guide structure at one end distant from the first cylindrical section 162. By installing the guide structure here, the guide sleeve 16 can be easily mounted. Specifically, the guide structure is a structure such as a chamfer or conical surface installed on the first cylindrical section 162 and the third cylindrical section 164.

In addition, the connecting piece 17 is connected to the valve body 10 by welding, and a mounting bracket 10c is further installed on the valve body 10. The mounting bracket 10c is installed at the valve body 10 or a connection point between the valve body 10 and the mounting seat 110. The mounting bracket 10c is connected to the valve body 10 by welding, or is connected by welding to the valve body 10 and the mounting seat 110, respectively. The mounting bracket 10c is matched with an external device to implement mounting of the electronic expansion valve 100.

Also, as shown in FIG. 8, a debris storage structure 120 is installed between the valve body 10 and the guide sleeve 16, and the debris storage structure 120 is connected to the valve body 10 and the guide sleeve 16. It is used to store debris between the guide sleeves (16). Therefore, during the process of installing the guide sleeve 16, debris on the valve body 10 and the guide sleeve 16 flows into the electronic expansion valve 100 in the form of impurities, affecting the normal operation of the electronic expansion valve 100. prevent it from affecting

In one embodiment, as shown in FIG. 9, the mounting cavity 14 has an inner wall, and the debris storage structure 120 includes a first debris storage structure 120 outlined in the circumferential direction of the inner wall of the mounting cavity 14. Includes a storage groove (121).

Preferably, a plurality of first debris storage grooves 121 may be installed, and the plurality of first debris storage grooves 121 are installed at intervals along the axis X of the valve body 10. It is installed on the inner wall of the cavity 14. A first debris guide structure 122 is provided in the notch of each of the first debris storage grooves 121 so that debris on the valve body 10 and the guide sleeve 16 flows into the first debris storage groove 121. It is easy to guide the flow.

Specifically, the first debris guide structure 122 includes a first debris guide portion 122a installed on the inner wall of the mounting cavity 14, and the first debris guide portion 122a stores the first debris. It is located in the notch of the groove 121. Preferably, the first debris guide portion 122a is located in a slope debris guide portion or a fillet debris guide portion.

The mounting cavity 14 also has an opening 142, which is installed away from the valve port 11. The first debris storage groove 121 is installed on the inner wall of the mounting cavity 14 at an open end 142 close to the mounting cavity 14. Therefore, under the premise of meeting the assembly requirements, the angle of the matching section between the guide sleeve 16 and the opening end 142 of the mounting cavity 14 is reduced as much as possible to reduce extrusion of debris.

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

Preferably, the second debris storage groove 123 is installed on the outer wall of the first cylindrical section 162. Additionally, the second debris storage groove 123 is installed close to the second end 162c of the first cylindrical section 162. It can be understood that the second end 162c of the first cylindrical section 162 is installed as an interference fit matching section with the relatively short mounting cavity 14 to reduce extrusion of debris.

Additionally, the second debris storage groove 123 may be installed in plural numbers. The plurality of second debris storage grooves 123 are installed on the outer wall of the first cylindrical section 162 at intervals along the axis Y of the guide sleeve 16. The notches of each of the second debris storage grooves 123 are provided with a second debris guide structure 124 so that debris on the valve body 10 and the guide sleeve 16 flows into the second debris storage groove 123. It is easy to guide the flow.

Specifically, the second debris guide structure 124 includes a second debris guide portion 124a installed on the outer wall of the guide sleeve 16, and the second debris guide portion 124a stores the second debris. It is located in the notch of the groove 123. Preferably, the second debris guide portion 124a is located in a slope debris guide portion or a fillet debris guide portion.

In another embodiment, the mounting cavity 14 has an inner wall, and the guide sleeve 16 has an outer wall. The debris storage structure 120 includes a first debris storage groove 121 of the first embodiment and a second debris storage groove 123 of the second embodiment. The first debris storage groove 121 on the inner wall of the mounting cavity 14 and the second debris storage groove 123 on the outer wall of the guide sleeve 16 are installed alternately with each other along the axis 103 direction. do.

As shown in FIGS. 17, 18, and 19, in one embodiment, the valve needle assembly 20 includes a valve needle sleeve 21 mounted in the guide sleeve 16, and the valve needle sleeve ( 21) and includes a valve needle 22 mounted therein. The valve needle 22 has an axis, and the axis of the valve needle 22 is installed to overlap the axis 103 of the valve body 10. One end of the valve needle 22 is connected to the screw rod assembly 30, and the other end is matched to the valve port 11. The screw rod assembly 30 controls the opening and closing of the valve port 11 by driving the valve needle 22 to move, thereby implementing the opening and closing of the electronic expansion valve 100.

The valve needle assembly 20 further includes a first spring seat 23, a second spring seat 24, an elastic member 25, and a guide seat 26. The first spring seat 23, the second spring seat 24, and the elastic member 25 are accommodated in the valve needle sleeve 21, and the first spring seat 23 is connected to the screw rod assembly 30. ) is connected to the guide sheet 26. One end of the elastic member 25 abuts on the first spring seat 23. The other end abuts on the second spring seat 24, and the guide seat 26 is mounted on an end of the valve needle sleeve 21 farthest from the valve needle 22 and is attached to the second spring seat 24. In contact with each other, the guide sheet 26 is configured to match the screw rod assembly 30.

Additionally, the valve needle assembly 20 further includes a ball 27, and the ball 27 is received within the valve needle sleeve 21. The ball 27 is installed between the valve needle 22 and the screw rod assembly 30 and is used to reduce the area of the friction contact surface between the valve needle 22 and the screw rod assembly 30. . Through this, wear and tear of the valve needle 22 and the screw rod assembly 30 is reduced, and the reliability and stability of the electronic expansion valve 100 are improved.

Preferably, the ball 27 is installed between the second spring seat 24 and the valve needle 22, and the ball 27 is connected to the valve needle 22 or the second spring seat 24. and are welded by spot welding. In this embodiment, a concave groove 221 is opened on the valve needle 22, the ball 27 is mounted in the concave groove 221, and the ball 27 and the valve needle 22 are welded by spot welding. Here, the second spring seat 24 and the valve needle 22 are brought into point contact through the installation of the ball 27, so that the friction contact surface between the second spring seat 24 and the valve needle 22 is formed. decreases. Through this, contact wear between the second spring seat 24 and the valve needle 22 is reduced, thereby improving the reliability and stability of the electronic expansion valve 100.

As shown in FIGS. 19, 33, and 34, the screw rod assembly 30 includes a screw rod 31 and a nut sleeve 32. The screw rod 31 has first and second ends installed opposite each other. One end of the screw rod 31 is connected to the rotor assembly 50, and the second end of the screw rod 31 penetrates the nut sleeve 32 and is connected to the first spring seat 23. . A thread connection is made between the second end of the screw rod 31 and the nut sleeve 32, and one end of the nut sleeve 32 is mounted on the connecting piece 17.

In addition, the nut sleeve 32 has a first end 32a and a second end 32b installed opposite each other, and the first end 32a of the nut sleeve is mounted on the connecting piece 17, and the nut sleeve 32 has a first end 32a and a second end 32b. The second end 32b of the sleeve is received within the sleeve 40. The first end 32a of the nut sleeve is extended to provide a matching section 321, and the matching section 321 extends into the mounting hole 111 and is installed close to the first cylindrical section 162. do.

Preferably, a clamping groove (32c) is installed in the first end (32b) of the nut sleeve, and a clamping protrusion is installed in the clamping groove (32c). Correspondingly, a connection hole is opened on the connecting piece 17, and the first end 32b of the nut sleeve is mounted in the connecting hole and makes a clamping connection with the connecting piece 17 through the clamping protrusion. Implement. When the screw rod 31 rotates under the driving of the rotor assembly 50, the screw rod 31 due to the matching relationship of the nut screw rod formed between the screw rod 31 and the nut sleeve 32 ) and the rotor assembly 50 fixedly connected to the screw rod 31 move along the axial direction of the screw rod 31, so that the screw rod 31 drives the movement of the valve needle assembly 20. Implement it to do so.

In addition, a matching hole 321a is opened on the matching section 321, and the third cylindrical section 164 extends from the matching hole 321a into the nut sleeve 32 and enters the nut sleeve 32. is fixedly connected with. By installing the matching section 321, the matching length between the guide sleeve 16 and the nut sleeve 32 can be extended, improving the connection reliability between the guide sleeve 16 and the nut sleeve 32. I understand that it can be done.

Preferably, the fixed connection includes a threaded connection, interference fit, etc. In this embodiment, since the third cylindrical section 164 and the nut sleeve 32 are tightly fitted, the nut sleeve 32 is correctly guided through the third cylindrical section 164 to It can be installed so that the axis of the nut sleeve 32 overlaps the axis of the guide sleeve 16 and the axis of the valve body 10.

In this embodiment, an interference fit is made between the first cylindrical section 162 and the mounting cavity 14. Since the third cylindrical section 164 and the nut sleeve 32 are tightly fitted, the valve body 10 is correctly guided through the first cylindrical section 162. The third cylindrical section 164 correctly guides the nut sleeve 32, making the tripartite axes of the valve body 10, the guide sleeve 16, and the nut sleeve 32 overlap, thereby driving the screw. Ensure three-way coaxiality of the rod 31, the valve needle 22 and the valve port 11. This reduces the collision between the valve needle 22 and the valve body 11 during the movement process, further reduces wear and tear on members such as the valve needle 22, and improves the service life of the electronic expansion valve 100. can understand.

A second positioning step 322 can be installed within the nut sleeve 32, and the second cylindrical section 163 extends into the nut sleeve 32 and is on the second positioning step 322. It touches. Furthermore, the reliability of the guide sleeve 16 is further improved and the guide sleeve 16 is prevented from freely moving in the axial direction and generating noise under the pressure of the fluid medium.

20 and 21, in another embodiment, the basic structure of the valve needle assembly 20 is basically the same as the structure of the valve needle assembly 20 described above, but the valve needle assembly 20 has a difference in that it further includes a bearing 211, a gasket 212, and an elastic member 213. The bearing 211 and the gasket 212 are installed at one end of the screw rod assembly 30 close to the valve needle 22, one end of the elastic member 213 is in contact with the gasket 212, and the other end is in contact with the valve needle ( 22) Contact. One end of the bearing 211 is in contact with the screw rod assembly 30 and the valve needle sleeve 21, and the other end is in contact with the gasket 212. The gasket 212 is received within the valve needle sleeve 21 and contacts the outer ring of the bearing 211.

A second protrusion 311 extending along the radial direction of the screw rod 31 is installed on the screw rod 31, and the second protrusion 311 is flush with the inner surface of the valve needle sleeve 21. . The inner ring of the bearing 211 is in contact with the second protrusion 311, and the inner surface of the valve needle sleeve 21 is in contact with the outer ring of the bearing 211 and the bearing of the screw rod 31 and the valve needle sleeve 21. Implement location restrictions for (211).

The screw rod 31 is fixedly connected to the inner ring of the bearing 211. In this embodiment, the screw rod 31 and the inner ring of the bearing 211 are fixed to each other by interference fit. That is, the size of the screw rod 31 is larger than the diameter of the inner ring of the bearing 211, and at this time, relatively desirable stability is provided between the screw rod 31 and the bearing 211.

In another embodiment, it can be understood that the screw rod 31 and the inner ring of the bearing 211 may be fixed to each other through other connection methods such as riveting or bonding.

The screw rod 31 rotates under the driving of the rotor assembly 50. Due to the fixed connection between the screw rod 31 and the inner ring of the bearing 211, the screw rod 31 drives the inner ring of the bearing 211 to rotate. The rolling element in the bearing 211 is in rolling contact with the outer ring of the bearing 211 to release the rotation of the screw rod 31. Since a plurality of rolling elements are provided in the bearing 211, release of rotation of the screw rod 31 changes the single-point rolling contact of the conventional electronic expansion valve 100 into a multi-point rolling contact of the present embodiment. Therefore, the contact force is shared and endured by a plurality of rolling elements, so the contact pressure at each contact point is lowered and the rolling friction weakens the friction force.

Additionally, due to the coaxial mounting of the bearing 211 and the screw rod 31, the contact force on the rolling elements becomes perpendicular to the direction of gravity of the screw rod 31. This relatively weakens the contact force on the contact point of the conventional electronic expansion valve and improves the stability and reliability of the electronic expansion valve 100. At the same time, since the bearing 211 has a clearance and the valve needle 22 has a certain degree of freedom, the coaxial error between the valve needle 22 and the valve port 11 can be reduced.

In this embodiment, the elastic member 213 is a spring, and in this case, the elastic member 213 has relatively high connection stability. It will be appreciated that in other embodiments, the elastic member 213 may be another type of elastic element, such as an elastic column or the like.

4 and 17, the rotor assembly 50 includes a rotor 51 located within the sleeve 40, a transition connection board 52 for mounting the screw rod 31, and the It includes a position limiting member 53 for limiting the rotation angle of the rotor 51 and a movement guide piece 54 mounted on the switching connection board 52. The rotor 51 is mounted on the switching connection board 52, and the switching connection board 52 and the screw rod 31 are fixedly connected by welding or the like.

The position limiting member 53 includes a spring 531 installed to cover the nut sleeve, and a stop ring 532 mounted on the movement guide piece 54. One end of the spring 531 is connected to the connecting piece 17, a stop portion 531a is installed on the other end of the spring 531, and the stop ring 532 is wound on the spring 531. . Preferably, a stop collar 323 is installed on the outer wall of the nut sleeve 32, and the stop collar 323 is configured to match the stop ring 532, so that the rotation angle of the rotor 51 limit.

In one embodiment, the rotor 51 rotates and moves along the axis 103 to drive the screw rod 31 to close the valve port 11. In, the stop ring 532 moves along the spring 531, and the stop ring 532 comes into contact with the stop collar 323 to change the rotation angle of the rotor 51 to the rotor 51. ) is limited to the lower limit of In the process of the rotor 51 rotating and moving along the axis 103 so that the screw rod 31 drives the valve needle 22 to open the valve port 11, the stop ring ( 532) moves along the spring 531, and the stop ring 532 comes into contact with the stop portion 531a to limit the rotation angle of the rotor 51 to the upper limit of the rotor 51.

Additionally, the outer side of the screw rod 31 extends along the outer radial direction of the screw rod 31 to form a boss 311. Since the boss 311 on the screw rod 31 abuts the guide sheet 26, it determines the lower limit of movement of the rotor 51 and the screw rod 31 in the electronic expansion valve 100.

Since the lower limit of the electronic expansion valve 100 is determined by the mutual contact between the screw rod 31 and the guide sheet 26, the screw rod 31 is a long straight pillar member that absorbs the impact force generated by mechanical collision. The direction coincides with the axial direction of the screw rod (31). In addition, not only are the vibrations and noises generated relatively small, but also the vibrations and noises generated by the impact force can be dissipated relatively quickly on a long straight pillar, so the electronic expansion valve 100 has a lower limit rotor assembly (50). ) Noise caused by movement state transition restrictions is relatively reduced.

In one embodiment, the upper limit of the electronic expansion valve 100 is implemented by mutual contact between the stop ring 532 and the stop portion 531a of the spring 531. In the process where the rotor 51 rotates and moves along the axis 103 to drive the screw rod 31 so that the valve needle 22 closes the valve port 11, the stop ring 532 is connected to the spring 531. ) and exercise accordingly. The stop ring 532 abuts the stop portion 531a to limit the rotation angle of the rotor 51 to the upper limit of the rotor 51 and the screw rod 31.

In another embodiment, in order to further reduce noise generated when the rotor assembly 50 switches motion states in the electronic expansion valve 100, the upper limit of the electronic expansion valve 100 is set at the screw rod 31. It is determined by the mutual contact between the end farthest from the valve needle assembly 20 and the sleeve 40. By adjusting the sizes of the stop portion 531a and the stop portion 532 of the spring 531, when the sleeve 40 abuts the screw rod 31, the stop ring 532 is connected to the stop portion (531a) of the spring 531. By preventing contact with 531a), the contact between the screw rod 31 and the sleeve 40 is set as the upper limit of the electronic expansion valve 100.

At this time, the upper limit of the electronic expansion valve 100 is still determined by the screw rod 31, and the screw rod 31 is a long straight pillar member, and the direction of the impact force generated by mechanical collision is in the axial direction of the screw rod 31. It matches. Therefore, not only are the vibrations and noises generated relatively small, but the vibrations and noises generated by the impact force can be quickly dissipated on a long straight pillar, so the electronic expansion valve 100 is capable of maintaining the upper limit of the rotor assembly 50 movement. Noise caused by state transition restrictions is relatively reduced.

Additionally, one end of the screw 31 adjacent to the sleeve 40 is set to a curved surface to match the shape of the inner surface of the sleeve 40. At this time, the connection performance between the screw rod 31 and the sleeve 40 is relatively good.

In another embodiment, the upper limit of the electronic expansion valve 100 may be further implemented by mutual contact between the guide seat 26 and the nut sleeve 32, and the nut sleeve 32 is connected to the guide seat 26. It touches. Since the guide seat 26 is fixedly connected to the screw rod 31, the screw rod 31 is limited to be further away from the valve port 11 through the abutment of the nut sleeve 32 against the guide seat 26. can do. At this time, by setting the length of the screw rod 31, the screw rod 31 does not contact the sleeve 40 when the nut sleeve 32 and the guide sheet 26 come into contact, thereby preventing the electronic expansion valve 100 from coming into contact with the sleeve 40. It is ensured that the upper limit is determined by the contact between the nut sleeve 32 and the guide sheet 26.

The nut sleeve 32 is a return member with a relatively large volume, and the noise caused by the impact force generated by mechanical collision is relatively small, and the noise caused by vibration and vibration generated on the nut sleeve 32 is also quickly eliminated, so the electronic Noise generated by the expansion valve 100 due to the upper limit movement state transition limit of the rotor assembly 50 is relatively reduced.

When the upper limit of the electronic expansion valve 100 is not implemented by mutual contact between the stop ring 532 and the stop portion 531a of the spring 531, that is, the electronic expansion valve 100 adopts the above implementation method. It can be seen that the stop ring 532 and spring 531 can be omitted. The structure of the electronic expansion valve 100 with the stop ring 532, movement guide piece 54, and spring 531 omitted is as shown in FIGS. 18 and 19.

The rotor assembly 50 and the screw rod assembly 30 move together, and the upper and lower movement limits of the rotor assembly 50, that is, the upper and lower movement limits of the screw rod assembly 30, are not distinguished in the present specification. I can understand.

The lower limit mentioned herein means the maximum working position moving from the screw rod 31 toward the valve port 11, and this working position is referred to as the lower limit. The upper limit mentioned herein means the maximum working position moving away from the valve port 11 on the screw rod 31, and this working position is referred to as the upper limit. In the upper and lower limits, “upper” and “lower” are not concepts of direction, but are merely names for convenience of explanation.

The stator assembly (not shown) includes members such as coils used to generate a magnetic field after energization, and rotates the rotor 51 under the action of the magnetic tension to realize rotation of the screw rod 31. .

In this embodiment, the electronic expansion valve 100 is an electric electronic expansion valve, and the rotor 51 is a motor rotor made of a permanent magnet in a stepping motor. The stator assembly is a motor stator in a stepping motor, and the stepping motor receives a logic digital signal provided by a control circuit and then transmits the signal to each phase coil of the motor stator. The motor rotor made of permanent magnets rotates due to magnetic torque, thereby implementing a movement process in which the stator assembly drives the rotor assembly to rotate.

The electronic expansion valve 100 of the present application adopts an integrated valve seat, and the number of assemblies of the electronic expansion valve 100 in the axial direction is reduced by integrating the valve core seat and sleeve seat of the conventional electronic expansion valve using the integrated valve seat. . That is, the possibility that the coaxiality of each component of the electronic expansion valve 100 may decrease due to multiple assemblies was reduced, and the coaxiality between each component of the electronic expansion valve 100 was improved. Additionally, by reducing the quantity of components, the valve opening performance of the electronic expansion valve 100 can be guaranteed, the ease of installation can be further improved, and the reliability and stability of the overall product can be improved.

Also, as shown in FIG. 7, the valve port 11 is installed coaxially with the valve body 10. One end where the valve port 11 is opened is designated as the first end 104 of the valve body 10, and the other end opposite to the first end 104 on the valve body 10 is designated as the second end 105. It is named. The valve port 11 is opened to be conveyed along a direction pointing from the second end 105 to the first end 104. By adopting the processing method of top transfer, the valve port of the valve body 10 is inserted and installed only once during processing, thereby reducing the number of installations of the valve port 11 of the valve body 10 during the manufacturing process. The possibility of a positioning error occurring in the valve port (11) of (10) is reduced, and the coaxiality of the valve port (11) and the valve body (10) is improved.

Additionally, since the valve port 11 is opened directly on the valve body 10, the welding fixation between the valve seat core opening the valve port and the valve body is reduced compared to a conventional electronic expansion valve. Reduction in the number of welds improves the integrity of the valve body 10, thereby improving the reliability and stability of the electronic expansion valve 100.

The valve port 11 has a first chamfer 106 installed at one end close to the second end 105 of the valve body 10. Due to the opening of the first chamfer 106, the valve port 11 forms an open structure in a portion close to the second end 105 of the valve body 10. Accordingly, the sealing performance of the valve needle 22 within the valve port 11 is improved, the internal leakage of the electronic expansion valve 100 is reduced, and the control precision for the fluid flow rate of the electronic expansion valve 100 is improved. You can.

A second chamfer 107 is installed at one end of the valve port 11 farthest from the second end 105 of the valve body 10. Due to the opening of the first chamfer 106 and the second chamfer 107, burrs occurring during the processing of the valve port 11 are removed, resulting in smoother distribution characteristics when the fluid medium passes through the valve port 11. make it have

Preferably, both the first chamfer 106 and the second chamfer 107 are less than 0.1 mm.

Additionally, to further block noise, the wall thickness where the valve body 10 and the guide sleeve 16 contact each other is 30% to 80% of the radius of the valve body 10. By setting the wall thickness where the valve body 10 and the guide sleeve 16 are in contact with each other to 30% to 80% of the radius of the valve body 10, noise is better blocked and the circulation noise of the fluid medium is reduced to 30% to 80% of the radius of the valve body 10. ) can be sealed internally. If the wall thickness of the valve body 10 is too thin, the sealing effect against noise is relatively poor. On the other hand, if the wall thickness of the valve body 10 is too thick, it is disadvantageous to fixedly mount members such as the valve needle assembly 20 within the valve body 10.

Preferably, the wall thickness where the valve body 10 and the guide sleeve 16 contact each other is 80% of the radius of the valve body 10.

As shown in FIG. 22, in order to reduce noise generated during use in the electronic expansion valve 100 and to reduce turbulence noise generated due to distribution instability when the fluid medium passes through the valve port 11, A noise reduction module 60 is installed between the medium discharge pipe 102 and the valve body 10. The noise reduction module 60 improves the stability of the fluid medium when it passes through the valve port 11 and reduces turbulent noise generated during use of the electronic expansion valve 100.

As shown in FIG. 23, a receiving cavity 10f communicating with the valve port 11 is opened on the valve body 10, and the receiving cavity 10f is configured to accommodate 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. The medium discharge pipe 102 covers a portion of the noise reduction module 60 and is installed to contact 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 discharge pipe 102. The welding fixation between the medium discharge pipe 102 and the valve body 10 ensures that the noise reduction module 60 is sandwiched and fixed between the valve body 10 and the medium discharge pipe 102.

It can be understood that in other embodiments, the noise reduction module 60 may adopt a different structure and be fixed between the valve body 10 and the medium discharge pipe 102. For example, the medium discharge pipe 102 may directly contact the other end of the noise reduction module 60, which is far from the valve port 11. In this case, the third protrusion 61 formed on the noise reduction module 60 is also omitted. It can be.

A noise reduction hole 62 is installed on the noise reduction module 60, and the noise reduction hole 62 is docked with the valve port 11. In the noise reduction hole 62, the diameter of the hole communicating with the valve port 11 matches the diameter of the valve port 11, so that the fluid medium flows smoothly into the noise reduction hole 62 through the valve port 11. comes in. Turbulence is prevented from occurring when the fluid medium flows into the noise reduction hole 62 through the valve port 11.

In this embodiment, the noise reduction hole 62 is installed coaxially with the valve port 11.

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.

In this embodiment, the noise reduction hole 62 is a three-stage stepped hole, and the noise reduction hole 62 includes a first hole 621, a second hole 622, and a third hole 623. The first hole 621 is docked to the valve port 11, and the first hole 621, the second hole 622, and the third hole 623 penetrate each other along the axial direction. 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 second hole 622 The diameter is larger than the diameter of the first hole 621.

In this embodiment, in order to further reduce turbulence occurring during fluid distribution and reduce noise when using the electronic expansion valve 100, the first hole 621, the second hole 622, and the third hole 623 are It is installed coaxially in a symmetrical circular hall.

Of course, if turbulence that may occur due to structural asymmetry is not taken into account when the fluid passes through the stepped hole, there is a gap between each central axis of the first hole 621, the second hole 622, and the third hole 623. may be formed, and the first hole 621, the second hole 622, and the third hole 623 may adopt the shape of a special hole.

In another embodiment, the noise reduction hole 62 has a structure of 2 sections, 4 sections, and 4 or more sections as long as the noise reduction hole 62 can form a step hole that gradually expands in the direction away from the valve port 11. It is understandable that the format may be adopted.

Hereinafter, the principle by which the noise reduction module 60 reduces fluid medium distribution noise in this embodiment will be described.

The noise reduction hole 62 is a stepped hole, and when the fluid medium flows into the noise reduction hole 62 through the valve port 11, the effective flow cross section is gradually expanded into a stepped shape. After the fluid medium flows into the noise reduction hole 62, the flow speed slows down, and the fluid medium gradually expands through the noise reduction hole to suppress the occurrence of a free shear surface. That is, the stability of the fluid medium is improved, and the fluid medium generates relatively little eddy current noise, thereby reducing noise when using the electronic expansion valve 100.

Also, referring to FIG. 25, in another embodiment, the noise reduction hole 62 is a horn hole, and the noise reduction hole 62 includes a cylindrical hole 621a communicating with the valve port 11, and It includes a conical hole (622a) communicating with the cylindrical hole (621a). One end of the conical hole 622a connected to the cylindrical hole 621a gradually expands in a direction away from the valve port 11. The diameter of the cylindrical hole 621a matches the diameter of the valve port 11.

It can be seen that the conical hole 622a may be docked directly to the valve port 11. That is, the diameter of one end of the conical hole 622a toward the valve port 11 matches the diameter of the valve port 11, and in this case, the cylindrical hole 621 may be omitted.

Since the opening of the cylindrical hole 621a corresponds to an increase in the length of the valve port 11, the stability of the fluid medium is further improved.

Hereinafter, the principle by which the noise reduction module 60 reduces fluid medium distribution noise in this embodiment will be described.

The noise reduction hole 62 is a horn hole, and the effective flow cross section when the fluid medium flows into the noise reduction hole 62 through the valve port 11 gradually expands. After the fluid medium flows into the noise reduction hole 62, the flow speed slows down, and the fluid medium gradually expands through the noise reduction hole to suppress the occurrence of a free shear surface. That is, the stability of the fluid medium is improved, and the fluid medium generates relatively little eddy current noise, thereby reducing noise when using the electronic expansion valve 100.

Referring to Figure 26, in another embodiment, the noise reduction hole 62 is a straight hole. The noise reduction hole 62 passes through two cross-sections of the noise reduction module 60 and is docked with the valve port 11, and the diameter of the noise reduction hole 62 matches the diameter of the valve port 11.

Hereinafter, the principle by which the noise reduction module 60 reduces fluid medium distribution noise in this embodiment will be described.

The noise reduction hole 62 is a straight hole with a relatively long length, and the noise reduction hole 62 corresponds to extending the length of the valve port 11. This causes the speed and pressure of the fluid medium flowing at the inlet end of the valve port 11 and the outlet end of the noise reduction hole 62 to gradually decrease. That is, the stability of the fluid medium is improved and noise generated from the electronic expansion valve 100 during use is reduced.

In addition, the noise reduction module 60 is modularized and fixed within the valve body 10, and the noise reduction module and the valve body 10 are installed separately. This eliminates the need to create a valve port 11 of a complex shape that is more difficult to process in the valve body 10, which is already relatively complex in shape on the electronic expansion valve 100. Therefore, the electronic expansion valve 100 components can be further standardized by adopting a combination of a standardized valve body 10 and a customized noise reduction module.

As shown in Figures 27 and 28, a welding ring 108 is further installed at one end where the medium discharge pipe 102 and the valve body 10 contact. Two adjacent sides of the weld ring 108 are in contact with the valve body 10 and the medium discharge pipe 102, respectively. The weld ring 108 is used to fill the weld joint 109 between the valve body 10 and the medium discharge pipe 102. The weld ring 108 is melted under high-temperature heating of external welding equipment, and the molten filler flows into the weld joint 109 formed between the valve body 10 and the medium discharge pipe 102, thereby forming the valve body 10 and Welding fastening to the medium discharge pipe 102 is implemented.

In addition, a welded structure 70 is further installed on the electronic expansion valve 100, and the welded structure 70 is located on one end of the valve body 10 close to the medium discharge pipe 102, along the valve body 10 axis ( 103) and includes a fourth protrusion 71 formed and extending perpendicularly to the direction. The medium discharge pipe 102 and the fourth protrusion 71 are in contact with each other, and the contact surface of the medium discharge pipe 102 and the fourth protrusion 71 is required to fill the welding material between the valve body 10 and the medium discharge pipe 102. It is a welded joint (109).

By providing the fourth protrusion 71 on the valve body 10, the formation position of the weld joint 109 is installed in a direction away from the contact end surface of the weld ring 108 and the valve body 10, so that the weld ring 108 ) and the weld joint 109 may be coplanar. The co-surface between the center of the weld ring 108 and the weld joint 109 is aligned flat so that the weld ring 108 flows smoothly into the weld joint 109 during welding, preventing weld deformation and weld separation from occurring. .

The welded structure 70 further includes a convex edge 72 installed on the medium discharge pipe 102. The medium discharge pipe 102 forms a convex edge 72 by extending the fourth protrusion 71 along the axis 103 direction of the valve body 10. That is, the thickness of the medium discharge pipe 102 is greater than the radial extension length of the fourth protrusion 71, and the weld ring 108 enters the weld joint 109 along the convex edge 72 in a molten state during welding. This allows the welding quality between the valve body 10 and the medium discharge pipe 102 to be further improved.

The welded structure 70 further includes a third chamfer 73 installed on the cross section where the medium discharge pipe 102 and the valve body 10 contact. The third chamfer 73 connects the convex edge 72 and the outer surface of the medium discharge pipe 102, and the weld ring 108 is in contact with the valve body 10 through the third chamfer 73. Due to the opening of the third chamfer 73, a receiving space 74 for receiving the welding ring 108 is formed between the valve body 10 and the medium discharge pipe 102. Since the accommodation space is an open structure, it is easier to fix the weld ring 108 on the valve body 10 and the medium discharge pipe 102, and the weld ring 108 is less likely to enter the weld joint 109 during welding. It could be easier.

The electronic expansion valve 100 installs a welded structure 70 on the valve body 10 and the medium discharge pipe 102, so that the center of the welded ring 108 is flush and aligned with the welded joint 109, The weld ring 108 can be smoothly introduced into the weld joint 109 in a molten state during welding. Additionally, the weld forming quality between the valve body 10 and the medium discharge pipe 102 is improved, and the reliability and stability of the electronic expansion valve 100 are improved.

As shown in Figure 2, the electronic expansion valve 100 further includes a pressure balancing channel 80. The pressure balance channel 80 is used to balance the pressure of the medium at the inlet 10a and the internal pressure of the electronic expansion valve 100, thereby preventing impact of the fluid medium on the guide sleeve 16. and noise can be reduced. In addition, when there is a change in the pressure of the medium at the inlet 10a, the pressure inside the electronic expansion valve 100 is quickly balanced with the pressure at the inlet through the pressure balance channel 80, thereby causing the electronic expansion. It is possible to prevent additional load from occurring inside the valve 100 and improve the stability of operation of the electronic expansion valve 100.

In one embodiment, the pressure balancing channel 80 is installed between the guide sleeve 16 and the valve body 10. The pressure balance channel 80 is used to communicate between the inside of the guide sleeve 16 and the valve body 10, so that the pressure of the fluid medium at the inlet 10a and the fluid between the inside of the guide sleeve 16 Balance media pressure.

As also shown in Figure 12, a pressure balancing channel 80 is outlined on the guide sleeve 16. The pressure balance channel 80 communicates between the valve cavity 12 and the guide hole 16a to balance the pressure between the valve cavity 12 and the guide hole 16a. Therefore, when the valve port 11 is opened, the fluid medium enters the valve cavity 12. At the same time, some fluid medium flows into the guide hole 16a through the pressure balance channel 80 to balance the pressure between the guide hole 16a and the valve cavity 12. Through this, it is possible to prevent impact of the fluid medium on the guide sleeve 16 and reduce noise. In addition, when the system pressure changes, the internal pressure of the electronic expansion valve 100 can be quickly balanced, preventing additional load due to pressure difference and improving the stability of operation of the electronic expansion valve 100. .

In this embodiment, the pressure is balanced between the valve cavity 12 and the guide hole 16a through the pressure balance channel 80. That is, by balancing the pressures of the valve cavity 12 and other parts of the electronic expansion valve 100 except for the valve cavity 12, the entire inside of the electronic expansion valve 100 is in a state of pressure balance. This is done to prevent additional load from occurring within the electronic expansion valve 100.

Preferably, the pressure balancing channel 80 includes at least one pressure balancing hole 80a, and the pressure balancing hole 80a communicates the valve cavity 12 and the guide hole 16a with each other. . Accordingly, some fluid medium enters the guide hole 16a through the pressure balance hole 80a to achieve the purpose of pressure balance.

The pressure balancing hole (80a) has an axis, and the axis of the pressure balancing hole (80a) is installed parallel to the axis (X). The pressure balance hole 80a is opened vertically on the guide sleeve 16, so that the pressure balance hole 80a does not affect the flow direction of the fluid medium and eliminates noise caused by changes in the flow direction of the fluid medium. can understand.

Additionally, the number of pressure balance holes 80a is two, and the two pressure balance holes 80a are uniformly distributed on the guide sleeve 16 along the circumferential direction of the axis X. Of course, in this embodiment, the number of pressure balance holes 80a may be 3, 4, etc., and the specific number of pressure balance holes 80a can be set according to actual demand.

Preferably, each of the pressure balancing holes 80a is a circular pressure balancing hole. Of course, in other embodiments, the pressure balance hole 80a may have a different shape. For example, the pressure balancing hole 80a is a rectangular or polygonal pressure balancing hole.

In another embodiment, as shown in FIGS. 4 and 30 to 34, the pressure balance channel 80 is installed between the mounting sheet 110, the guide sleeve 16, and the nut sleeve 32. It is used to communicate between the inlet 10a and the inside of the guide sleeve 16, the inside of the mounting sheet 110, the inside of the nut sleeve 32, and the inside of the sleeve 40. Through this, the pressure of the fluid medium at the inlet 10a and the pressure of the fluid medium between the inside of the guide sleeve 16, the inside of the mounting sheet 110, the inside of the nut sleeve 32, and the inside of the sleeve 40 are balanced. is achieved.

The pressure balance channel 80 includes a first balance channel 81 and a second balance channel 82. The first balancing channel 81 is used to communicate between the inlet 10a and the inside of the guide sleeve 16, the inside of the screw rod assembly 30, and the inside of the sleeve 40. The second balancing channel 82 is used to ensure that the interior of the mounting sheet 110 communicates with the first balancing channel 81. Therefore, through the first balancing channel 81 and the second balancing channel 82, the inside of the guide sleeve 16, the inside of the mounting sheet 110, the inside of the nut sleeve 32, and the inside of the sleeve 40 The inlets are communicated with each other. When the fluid medium flows in from the inlet 10a, a part of the fluid medium passes through the first balance channel 81 and enters the guide sleeve 16, the screw rod assembly 30, and the sleeve 40. flows into. It flows into the mounting sheet 110 through the second balancing channel 82, and the medium pressure at each point inside the electronic expansion valve 100 becomes the same.

The first balancing channel 81 includes a first balancing hole 811 and a second balancing hole 812. The first balance hole 811 is opened on the guide sleeve 16 and is used to communicate between the inside of the guide sleeve and the valve cavity 12. The second balancing hole 812 is opened on the nut sleeve 32 and is used to communicate the inside of the sleeve 40 with the inside of the nut sleeve 32. Through this, the purpose of pressure balance is achieved by communicating between the valve cavity 12 and the inside of the guide sleeve 16, the inside of the nut sleeve 32, and the inside of the sleeve 40.

Additionally, the first balancing hole 811 has an axis, and the axis of the first balancing hole 811 is installed parallel to the axis 103. The first balancing hole 811 is opened vertically on the guide sleeve 16, so that the first balancing hole 811 does not affect the flow direction of the fluid medium and reduces noise due to changes in the flow direction of the fluid medium. You can see that it is removed.

Preferably, the number of the first balancing holes 811 is two, and the two first balancing holes 811 are uniformly distributed on the guide sleeve 16 along the circumferential direction of the axis 103. do. Of course, in this embodiment, the number of first balancing holes 811 may be 3, 4, etc., and the specific number of first balancing holes 811 may be set according to actual demand.

Each of the first balancing holes 811 is a circular pressure balancing hole. In another embodiment, the first balancing hole 811 may have a different shape. For example, it may be a rectangular or polygonal pressure balancing hole.

The second balancing hole 812 has an axis, and the axis of the second balancing hole 812 is installed perpendicular to the axis of the first balancing hole 811. Of course, in another embodiment, the axis of the second balancing hole 812 may not be perpendicular to the axis of the first balancing hole 811.

The second balancing channel 82 includes the third balancing hole 821, and the third balancing hole 821 is opened on the connecting piece 17. The third balance hole 821 is used to communicate the inside of the mounting sheet 110 and the inside of the sleeve 40, and at the same time, the third balance hole 821 is used to mount the spring 531. It is also used. One end of the spring 531 extends into the third balance hole 821. The inside of the mounting sheet 110 and the first balance channel 81 are communicated through the third balance hole 821, and the fluid medium in the inlet 10a is connected to the first balance channel 81 and the third balance channel 81. It flows into the interior of the mounting sheet 110 through the balance channel 821.

Preferably, the third balancing hole 821 is a slot hole, and the third balancing hole 821 is installed as an opening perpendicular to the axis direction of the valve body. The number of third balancing holes 821 is plural. In this embodiment, the number of the third balancing holes 821 is two, and the two third balancing holes 821 are installed symmetrically with respect to the valve body axis.

As shown in FIGS. 2 and 3, the second balance channel 82 may further include a fourth balance hole 822 and a fifth balance hole 823. The fourth balancing hole 822 is opened on the guide sleeve 16, and the fifth balancing hole 823 is opened on the nut sleeve 32. The fourth balance hole 822 is in communication with the fifth balance hole 823 and is connected to the inside of the guide sleeve 16 and the mounting sheet through the fourth balance hole 822 and the fifth balance hole 823. (110) Communicate the inside. Here, by further installing the fourth balancing hole 822 and the fifth balancing hole 823, the speed of achieving medium pressure balance between the inside of the mounting sheet 110 and the inlet 10a can be improved.

Additionally, the fourth balancing hole 822 is opened on the second cylindrical section 163, and the fifth balancing hole 823 is opened on the matching section 321. Communication is implemented between the mounting hole 111 and the guide hole 16a through the fourth balancing hole 822 and the fifth balancing hole 822, so that the inside of the mounting sheet 110 and the first Implements communication between the balance channels (81).

The fourth balancing hole 822 has an axis and the fifth balancing hole 822 also has an axis. The axis of the fourth balance hole 822 is installed to overlap the axis of the fifth balance hole 822, and the axis of the fourth balance hole 822 and the axis of the first balance hole 811 are perpendicular to each other. It is installed as Of course, in another embodiment, as long as the fourth balance hole 822 and the fifth balance hole 822 are in communication, the axis of the fourth balance hole 822 and the fifth balance hole 822 The axes may not overlap, and the axes of the fourth balance hole 822 and the first balance hole 811 may not be perpendicular.

The technical features of the above-described embodiments can be arbitrarily combined. For the sake of concise description, all possible combinations of technical features according to the above-described embodiments have not been described, but as long as there is no contradiction in the combination of technical features, all of them should be considered within the scope described in the present invention.

The above-described embodiments represent various embodiments of the present invention and the description is relatively specific and detailed, but should not be understood as limiting the scope of the present invention patent. It should be noted that a person skilled in the art to which the present invention pertains may make modifications and improvements without departing from the concept of the present invention, which all fall within the protection scope of the present invention. Therefore, the scope of protection of the present invention patent is based on the appended claims.

Claims (10)

In the electronic expansion valve,
Comprising a valve body, a valve needle assembly and a guide sleeve, the valve body has an axis, the valve body has a valve port opened along the axis, the valve needle assembly is mounted in the guide sleeve, and the guide The valve port is opened or closed under the guidance of a sleeve, a mounting cavity communicating with the valve port is opened on the valve body, the guide sleeve is mounted in the mounting cavity and is tightly fitted with the mounting cavity, and the valve A debris storage structure is installed between the main body and the guide sleeve, and the debris storage structure is used to store debris between the valve body and the guide sleeve,
The guide sleeve has an outer wall, and the mounting cavity has an inner wall,
Debris storage grooves are formed on the guide sleeve outer wall and the mounting cavity inner wall, respectively, and the debris storage grooves on the guide sleeve outer wall and the debris storage grooves on the mounting cavity inner wall are installed alternately along the axis,
The electronic expansion valve, wherein the debris storage groove on the outer wall of the guide sleeve and the debris storage groove on the inner wall of the mounting cavity are located at an end farthest from the valve port. delete According to paragraph 1,
The electronic expansion valve is characterized in that the number of the debris storage grooves is plural, and the plurality of debris storage grooves are installed to be spaced apart along the axis. delete According to paragraph 1,
An electronic expansion valve, wherein a debris guide structure is installed in a notch of the debris storage groove, and the debris guide structure is used to guide debris to flow into the debris storage groove. According to clause 5,
The electronic expansion valve, wherein the debris guide structure includes a debris guide portion, and the debris guide portion is located in a notch of the debris storage groove. According to clause 6,
The electronic expansion valve, wherein the debris guide part is an inclined debris guide part or a fillet debris guide part. delete According to paragraph 1,
The guide sleeve includes a first cylindrical section and a second cylindrical section, and is tightly fitted between the first cylindrical section and the mounting cavity, and the debris storage groove of the guide sleeve is on the outer wall of the first cylindrical section. An electronic expansion valve, characterized in that it is opened. According to clause 9,
A valve cavity is provided in the valve body, a through hole is opened at the bottom of the mounting cavity, the through hole communicates with the valve cavity, and the second cylindrical section extends from the through hole into the valve cavity. Features an electronic expansion valve.