KR20210154205A - Electronic expansion valve - Google Patents

Abstract

The present invention provides an electromagnetic expansion valve (100), wherein the electromagnetic expansion valve (100) includes a valve body (10), a valve needle assembly (20), a screw rod assembly (30), a rotor assembly (50), and a stator assembly and a sleeve 40 . A guide sleeve 16 guiding the valve needle assembly 20 to move is installed inside the valve body 10 , 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, and the rotation 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 It is installed so as to cover one end of the valve body 10 that is far from the valve port 11 .

Description

Electronic expansion valve {ELECTRONIC EXPANSION VALVE}

This application is "Electronic Expansion Valve" of Application No. 2018213376030, filed on August 17, 2018, "Electronic Expansion Valve" of Application No. 2018213353433, filed on August 17, 2018, Application No. 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, filed on August 17, 2018 "Electronic expansion valve" of application number 2018109433995, "electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018109434023 filed on 8/17/2018, application number 2018213355354 filed on August 17, 2018 "Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve" of "Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve", Application No. 2018109416190, filed on August 17, 2018, August 17, 2018 “Electronic expansion valve and air-conditioning system using the electromagnetic expansion valve” of the application number 2018213352892 filed on the same day, “The electronic expansion valve and the air-conditioning system using the electromagnetic expansion valve” of the application number 2018109427462 filed on August 17, 2018 , claim priority to the Chinese Patent/Design Application of "Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve" of Application No. 201821335213X, filed on Aug. 17, 2018, which is incorporated herein by reference in its entirety. became

TECHNICAL FIELD The present invention relates to the field of refrigeration technology, and more particularly, to an electronic expansion valve.

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

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

The technical solution of the present application is as follows.

The electronic expansion valve provided in the present application includes a valve body, a valve needle assembly, a screw rod assembly, a rotor assembly, a stator assembly, and a sleeve. A guide sleeve guiding the valve needle assembly to move is installed inside the valve body, and the valve needle assembly is installed on the guide sleeve. The screw rod assembly is coupled to the rotor assembly, the stator assembly acting on the rotor assembly to drive the rotor assembly to rotate, and rotation of the rotor assembly causes the screw rod assembly to move. 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 to cover one end of the valve body that is far from the valve port.

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

1 is a perspective view of an electronic expansion valve according to an embodiment;
2 is a cross-sectional view of an electronic expansion valve according to an exemplary embodiment.
3 is a perspective view of an electronic expansion valve according to another exemplary embodiment.
FIG. 4 is a cross-sectional view of the electromagnetic expansion valve according to FIG. 3 ;
5 is a cross-sectional view of a valve body according to an embodiment.
6 is a cross-sectional view of a valve body in which a second mounting step is installed according to an embodiment.
7 is a cross-sectional view of a valve body according to another embodiment.
8 is a cross-sectional view of a valve body in which a debris storage structure is installed according to an exemplary embodiment.
9 is an enlarged view of B in FIG. 8 .
10 is a cross-sectional view of a valve body in which a position limiting unit is installed according to an exemplary embodiment.
11 is an enlarged view of C in FIG. 10 .
12 is a cross-sectional view of a debris storage structure according to another embodiment.
13 is an enlarged view of D in FIG. 12 .
14 is a cross-sectional view of a guide sleeve according to an embodiment.
15 is a cross-sectional view of a guide sleeve according to another embodiment.
16 is a cross-sectional view of a guide sleeve according to another embodiment.
17 is a perspective view of an electromagnetic expansion valve in which a sleeve and a valve body are omitted according to an embodiment;
18 is a perspective view of a screw rod assembly according to an embodiment;
19 is a cross-sectional view of a valve needle assembly and a screw rod assembly according to an embodiment.
20 is a cross-sectional view of an electronic expansion valve according to another exemplary embodiment.
FIG. 21 is a cross-sectional view of the valve needle assembly according to FIG. 20 ;
22 is a cross-sectional view of an electronic expansion valve in which a noise reduction module is installed according to an exemplary embodiment.
23 is a cross-sectional view of a valve body in which a receiving cavity is outlined according to an embodiment.
24 is a cross-sectional view of a noise reduction module according to an embodiment.
25 is a cross-sectional view of a noise reduction module according to another exemplary embodiment.
26 is a cross-sectional view of a noise reduction module according to another embodiment.
27 is a cross-sectional view of an electromagnetic expansion valve to which a welding structure is installed according to an exemplary embodiment.
28 is an enlarged view of E in FIG. 27 .
29 is an enlarged view of A in FIG. 4 .
30 is a cross-sectional view of a guide sleeve according to an embodiment.
31 is a perspective view of a connecting piece according to an embodiment;
32 is a plan view of a connecting piece according to an embodiment.
33 is a perspective view of a nut sleeve according to one embodiment;
34 is a cross-sectional view of a nut sleeve according to one embodiment.
In the drawings, reference numeral 100 denotes an electromagnetic expansion valve, 101 a medium inlet pipe, 102 a medium outlet pipe, 103 an axis line, 104 a first end of the valve body, 105 a second end of the valve body, 106 a first chamfer, 107 a second 2 chamfer, 108 weld ring, 109 weld seam, 10 valve body, 10a inlet, 10b outlet, 10c mounting bracket, 10d first mounting step, 10e second mounting step, 10f receiving cavity, 11 is a valve port, 12 is a valve cavity, 13 is a through hole, 14 is a mounting cavity, 14a is a first positioning step, 141 is a position limiting part, 141a is an inner surface of a position limiting part, 141b is an outer surface of a position limiting part, 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 plane, 162 is a first cylindrical section, 162a is a step, 162b is the first end of the first cylindrical section, 162c is the second end of the first cylindrical section, 163 is the second cylindrical section, 164 is the third cylindrical section, 165 is a guide structure, 166 is a boss, 17 is Reference numeral 18 denotes a first protrusion, 19 a connecting groove, 120 a debris storage structure, 121 a first debris storage groove, 122 a first debris guide structure, 122a a first debris guide part, 123 a second debris storage groove , 124 is a second debris guide structure, 124a is a second debris guide part, 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, 24 is a second Reference numeral 25 is an elastic member, 26 is a guide seat, 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 a first end of the nut sleeve, 32b is Nut sleeve second end, 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 is a 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 motion guide piece, 60 is a noise reduction module, 61 is a third protrusion, 62 is a noise reduction hole, 621 is a first hole, 622 is a second hole, 623 is a 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, 73 is a third chamfer, 80 is a pressure balancing channel, 80a is a pressure balancing hole, 81 is a first balancing channel, 811 is a first balancing hole, 812 is a second balancing hole, 82 is a second balancing channel , 821 is a third balancing hole, 822 is a fourth balancing hole, and 823 is a fifth balancing hole.

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

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

The electromagnetic 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 in the sleeve 40 , and the stator assembly is installed on the sleeve 40 . The stator assembly is energized to generate a magnetic field, which 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. By implementing opening and closing, the purpose of flow and pressure regulation is achieved.

5, the valve body 10 is made of stainless steel. Of course, the valve body 10 may be manufactured by processing other materials. In this embodiment, they 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), on the valve body (10) sequentially along the axis (103) a valve port (11), a valve cavity (12), a through hole (13), a mounting cavity ( 14) and a connecting cavity 15 are outlined. The valve port 11 is used to extend and enter the valve needle assembly 20 to control the flow rate of the fluid medium in the valve port 11 . 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 cut off, the electromagnetic expansion valve 100 is closed. On the other hand, when the valve needle assembly 20 releases the sealing of the valve port 11 , that is, when the valve port 11 and the valve cavity 12 communicate, the electromagnetic expansion valve 100 is opened. The through hole 13 is opened at 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 . The 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 connected to the axis line 103 It can be understood that they communicate with each other along the direction.

An inlet 10a and an outlet 10b through which a fluid medium is introduced are further opened 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 conduction or closing between the inlet 10a and the outlet 10b.

Preferably, the inlet 10a is equipped with a medium inlet pipe 101 for transporting the fluid medium, and the outlet 10b is equipped with a medium outlet pipe 102 for transporting the fluid medium. In this embodiment, the fluid medium is a refrigerant, and the refrigerant flows into the electromagnetic expansion valve 100 from the medium inlet pipe 101 , and the medium is subjected to throttle decompression by the electromagnetic 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 convexly installed at one end far from the sleeve 40 in the valve body 10 . The outlet 10b passes through the first projection 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 opened at one end far from the sleeve 40, and the first protrusion 18 is located at the bottom of the groove of the connection groove 19, One end of the medium discharge pipe 102 is installed to cover the first protrusion 18 and abuts against the bottom of the groove of the connection groove 19 . Here, through the installation of the connection groove 19, it is possible to easily weld between the medium discharge pipe 102 and the valve body 10, and prevent the solder from flowing out, thereby improving welding quality.

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

In addition, a first mounting step 10d is installed on the valve body, and the first mounting step 10d is located at one end where the connection cavity 15 is opened in the valve body 10, 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 seat 110 may be installed on the valve body 10 , and the sleeve 40 may include the mounting seat 110 . ) is mounted on the One end of the guide sleeve 16 is mounted in the mounting cavity 14 and press-fitted with the mounting cavity 14 , and the other end extends from within the mounting cavity 14 and the screw rod assembly 30 . connected to, and the connecting piece 17 is mounted on the mounting sheet 110 .

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

In this embodiment, by replacing some functions of the valve body 10 with the mounting seat 110 through the installation of the mounting seat 110, used to mount the screw rod assembly 30 and the sleeve 40 do. Through this, it is possible to reduce the weight of the valve body 10 and reduce the processing difficulty of 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 electromagnetic expansion valve 100 is improved.

Preferably, a second mounting step 10e is installed on the valve body 10 , and the mounting seat 110 is welded on the second mounting step 10e. The valve body 10 and the mounting seat 110 may adopt an integral structure or a separate structure, and 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 includes a circumferentially limiting portion 141 at one end far from the valve port 11 . The step 162a is matched with the position limiting part 141 and used to implement the guide sleeve 16 so that the position is determined along the axis line 103 direction. This prevents the guide sleeve 16 from being loosened along the axis 103 under factors such as high pressure of the fluid medium, high/low temperature of the fluid medium, and the like from generating noise.

In addition, 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 part 141 has a trapezoidal or arc-shaped cross section along the plane on which the axis X is located. One end of the position limiting part 141 having a larger inner diameter is installed near the mounting cavity 14 , and one end of the position limiting part 141 having a smaller inner diameter is installed far from the mounting cavity 14 .

The position limiting part 141 has an inner surface 141a and an outer surface 141b which are installed opposite to each other and used to abut the guide sleeve 16 . An included angle a is formed between the inner surface 141a of the position limiting part and the inner wall of the mounting cavity 14 . The included angle α formed between the inner surface 141a of the position limiting part and the inner wall of the mounting cavity 14 corresponds to forming an axial shoulder that limits the X-axis direction movement of the guide sleeve 16. have to understand

Preferably, the range of the included angle a is 120°≤a≤160°. Accordingly, under the above angle range, the guide sleeve 16 can be installed in the mounting cavity 14 , and can also limit the movement of the guide sleeve 16 in the X-axis direction. Specifically, in this embodiment, the included angle is a=160°.

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

Of course, in another embodiment, the position limiter 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 or the like.

14, the guide sleeve 16 is manufactured by processing a brass material, that is, a brass guide sleeve. Since the guide sleeve made of brass material is relatively soft, it is easy to mount between the guide sleeve 16 and the screw rod assembly 30 or the valve body 10, 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 has a generally cylindrical shape, the guide sleeve 16 and the valve port 11 are installed to be spaced apart, and the guide sleeve 16 has one end close to the valve port 11 . This is the plane 161 . Here, the plane 161 is a smooth surface or a smooth surface. That is, since the friction coefficient of the plane 161 is relatively low, when the fluid medium passes through the plane 161 , it flows along the plane 161 , thereby further reducing the noise of the fluid.

The guide sleeve 16 has an axis Y, on which a guide hole 16a and a valve needle hole 16b are established along the axis Y on the guide sleeve 16 . A diameter of the valve needle hole 16b is smaller than a 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-step 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 . a second cylindrical section 163 used to In another embodiment, the guide sleeve 16 may have a two-stage structure.

The first cylindrical section 162 and the mounting cavity 14 are press-fitted, so that during the mounting process of the guide sleeve 16, the axis of the guide sleeve 16 itself is 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 an intermediate section, that is, between the second cylindrical section 163 and the third cylindrical section 164 . An outer diameter of the first cylindrical section 162 is greater than an outer diameter of the second cylindrical section 163 and an outer diameter of 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 The step 162a between 164 is matched with the bottom first positioning step 14a of the mounting cavity 14 to realize positioning of the second cylindrical section 163 .

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

Preferably, in the first cylindrical section, the cross section of the first end 162b abuts against the bottom of the mounting cavity 14 to implement the mounting of the guide sleeve 16 . In addition, 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 may be facilitated through the installation of the guide structure 165 . In addition, one end of the second cylindrical section 163 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 conical guide portion. Of course, in other embodiments, the guide structure 165 may have a different structure.

15 , in another embodiment, the structure of the guide sleeve 16 is basically the same as that 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 end far from the first cylindrical section in the boss 166 is the plane 161 . There is this. The boss 166 extends and enters the through hole 13 , and the plane 161 abuts on the first positioning step 14a to implement positioning and installation of the guide sleeve 16 .

As shown in Fig. 16, in another embodiment, the structure of the guide sleeve 16 is basically the same as that 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, and the third cylindrical section 164 and the valve port 11 are installed to be spaced apart, and the third There is a difference in that one end far from the first cylindrical section 162 in the cylindrical section 164 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 third cylindrical section 163 and the second cylindrical section 163 . The third cylindrical section 164 extends into the valve cavity 12 from the through hole 13 . Preferably, the third cylindrical section 164 has a stepped shape.

In addition, 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 may have a size sufficient to match the screw rod assembly 30, the connection reliability is improved, and the risk of the guide sleeve 16 loosening due to vibration reduction, etc. is lowered. . Of course, as the third cylindrical section 164 lengthens, the overall length of the guide hole 16a increases. The valve needle assembly 20 is mounted in the guide hole 16a to improve 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 reliability of the connection between the second cylindrical section 163 and the screw rod assembly 30 is further improved. It can be understood that improvement

In the third cylindrical section 164 , one end far from the first cylindrical section 162 also has a guide structure. Here, by providing the guide structure, the guide sleeve 16 can be easily mounted. Specifically, the guide structure is a structure such as a chamfer or a conical surface installed on the first cylindrical section 162 and the third cylindrical section 164 .

In addition, the connection piece 17 is welded to the valve body 10 , and a mounting bracket 10c is further installed on the valve body 10 . The mounting bracket 10c is installed at the connection point between the valve body 10 or the valve body 10 and the mounting seat 110 . The mounting bracket 10c is welded to the valve body 10 or welded to the valve body 10 and the mounting seat 110, respectively. The mounting bracket 10c is matched with an external device to implement the 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 formed between the valve body 10 and the Used to store debris between the guide sleeves 16 . Accordingly, in the process of installing the guide sleeve 16 , debris on the valve body 10 and the guide sleeve 16 flows into the electromagnetic expansion valve 100 in the form of impurities, affecting the normal operation of the electromagnetic 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 profiled circumferentially along the inner wall of the mounting cavity 14 . and a storage groove 121 .

Preferably, a plurality of the first debris storage grooves 121 may be installed, and the plurality of first debris storage grooves 121 are installed at intervals along the axis line (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 is directed to the first debris storage groove 121 . It is easy to guide the inflow.

Specifically, the first debris guide structure 122 includes a first debris guide part 122a installed on the inner wall of the mounting cavity 14 , and the first debris guide part 122a is configured to store the first debris It is located in the notch of the groove (121). Preferably, the first debris guide part 122a is positioned on an inclined surface debris guide part or a fillet debris guide part.

The mounting cavity 14 also has an opening 142 , the opening 142 being installed away from the valve port 11 . The opening 142 end of the first debris storage groove 121 close to the mounting cavity 14 is installed on the inner wall of the mounting cavity 14 . Therefore, on the premise that the assembly requirements are satisfied, the angle of the matching section between the guide sleeve 16 and the opening 142 end of the mounting cavity 14 is reduced as much as possible to reduce the 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 includes a second circumferential direction of the outer wall of the guide sleeve. and a debris storage groove 123 .

Preferably, the second debris storage groove 123 is installed on the outer wall of the first cylindrical section 162 . In addition, 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 the extrusion of debris.

In addition, a plurality of the second debris storage grooves 123 may be installed. 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 . A second debris guide structure 124 is provided in the notch of each of the second debris storage grooves 123 so that debris on the valve body 10 and the guide sleeve 16 is directed into the second debris storage groove 123 . It is easy to guide the inflow.

Specifically, the second debris guide structure 124 includes a second debris guide part 124a installed on the outer wall of the guide sleeve 16, and the second debris guide part 124a is configured to store the second debris. It is located in the notch of the groove (123). Preferably, the second debris guide part 124a is positioned on an inclined surface debris guide part or a fillet debris guide part.

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 to be staggered along the axis 103 direction. do.

17, 18 and 19 , in one embodiment, the valve needle assembly 20 includes a valve needle sleeve 21 mounted within the guide sleeve 16, and the valve needle sleeve ( and a valve needle 22 mounted in 21 ). 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 the screw rod assembly 30 . ) and abuts on 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 one end far from the valve needle 22 in the valve needle sleeve 21 to the second spring seat 24 . Abuts, the guide seat 26 is configured to match the screw rod assembly 30 .

Also, the valve needle assembly 20 further includes a ball 27 , the ball 27 being accommodated in 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 a frictional contact surface between the valve needle 22 and the screw rod assembly 30 . . Through this, wear of the valve needle 22 and the screw rod assembly 30 is reduced, and reliability and stability of the electromagnetic 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 the valve needle 22 or the second spring seat 24 . The space between the and is welded by spot welding. In this embodiment, a concave groove 221 is opened on the valve needle 22 , and the ball 27 is mounted in the concave groove 221 , and the ball 27 and the valve needle 22 . The in-between is welded by spot welding. Here, the second spring seat 24 and the valve needle 22 are in point contact through the installation of the ball 27 so that the frictional contact surface between the second spring seat 24 and the valve needle 22 is decreases. Through this, contact wear between the second spring seat 24 and the valve needle 22 is reduced, and thus the reliability and stability of the electromagnetic expansion valve 100 are improved.

19 , 33 and 34 , the screw rod assembly 30 includes a screw rod 31 and a nut sleeve 32 . The screw rod 31 has a first end and a second end installed opposite to 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 passes through the nut sleeve 32 and is connected to the first spring seat 23 . . A second end of the screw rod 31 and the nut sleeve 32 are threadedly connected, 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 to each other, and the first end 32a of the nut sleeve is mounted on the connecting piece 17 , and the nut A 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 provided 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 connection piece 17, the first end 32b of the nut sleeve is mounted in the connection hole, and the clamping connection with the connection piece 17 is performed 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 to do

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 . There is a fixed connection between The matching length between the guide sleeve 16 and the nut sleeve 32 can be extended by installing the matching section 321 , thereby improving the reliability of the connection between the guide sleeve 16 and the nut sleeve 32 . understand that it can be done.

Preferably, the fixed connection includes a threaded connection, an interference fit, and the like. In this embodiment, since there is an interference fit between the third cylindrical section 164 and the nut sleeve 32, the nut sleeve 32 is properly guided through the third cylindrical section 164 to It may 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 formed between the first cylindrical section 162 and the mounting cavity 14 . Since there is an interference fit between the third cylindrical section 164 and the nut sleeve 32 , the valve body 10 is properly guided through the first cylindrical section 162 . The third cylindrical section 164 correctly guides the nut sleeve 32 so that the three-way axes of the valve body 10 , the guide sleeve 16 and the nut sleeve 32 overlap, so that the screw To ensure tripartite 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 in the course of movement, further reduces wear of members such as the valve needle 22 , and improves the service life of the electromagnetic expansion valve 100 . can understand

A second positioning step 322 may be installed in the nut sleeve 32 , and the third cylindrical section 164 extends into the nut sleeve 32 and is on the second positioning step 322 . touch Furthermore, the reliability of the guide sleeve 16 is further improved and noise is prevented from being generated by the guide sleeve 16 moving arbitrarily in the axial direction under the pressure of a fluid medium.

20 and 21 , in another embodiment, the basic structure of the valve needle assembly 20 is basically the same as that of the above-described valve needle assembly 20, but the valve needle assembly 20 The difference is 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 close to the valve needle 22 in the screw rod assembly 30, and one end of the elastic member 213 is in contact with the gasket 212, and the other end is the valve needle ( 22) is in contact with 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 accommodated in the valve needle sleeve 21 and is in contact with 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 , so that the screw rod 31 and the bearing of the valve needle sleeve 21 . (211) to implement the positional constraint.

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 an 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 in this case, the screw rod 31 and the bearing 211 have relatively desirable stability.

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 joint fixing.

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 , the release of rotation of the screw rod 31 changes the single-point rolling contact of the conventional electromagnetic expansion valve 100 to the multi-point rolling contact of the present embodiment. Therefore, the contact force is shared and endured by the plurality of rolling elements, so the contact pressure on each contact point is lowered, and the rolling friction weakens the friction force.

Also, due to the coaxial mounting of the bearing 211 and the screw rod 31 , the contact force on the rolling element is 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 play, and the valve needle 22 has a certain degree of freedom, it is possible to reduce a coaxial error between the valve needle 22 and the valve port 11 .

In this embodiment, the elastic member 213 is a spring, and in this case, the elastic member 213 has a 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.

With continued reference to FIGS. 4 and 17 , the rotor assembly 50 includes a rotor 51 positioned within the sleeve 40 , a diverting connection board 52 for mounting the screw rod 31 , and the and a position limiting member 53 for limiting the rotation angle of the rotor 51 and a motion guide piece 54 mounted on the switching connection board 52 . The rotor 51 is mounted on the conversion connection board 52 , and the conversion 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 motion guide piece 54 . One end of the spring 531 is connected to the connection piece 17 , a stop portion 531a is installed at 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 , the rotation angle of the rotor 51 . to limit

In one embodiment, the rotor 51 rotates and moves along the axis 103 so that the screw rod 31 drives the valve needle 22 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 adjust the rotation angle of the rotor 51 to the rotor 51 . ) is limited to the lower limit of While the rotor 51 rotates and moves along the axis 103 to drive the screw rod 31 so that the valve needle 22 opens 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 .

In addition, the outer side of the screw rod 31 extends along the radial direction outside of the screw rod 31 to form the boss (311). Since the boss 311 on the screw rod 31 abuts against the guide sleeve 26 , it determines the lower limit of motion of the rotor 51 and the screw rod 31 in the electromagnetic expansion valve 100 .

Since the lower limit of the electromagnetic expansion valve 100 is determined by the mutual contact between the screw rod 31 and the guide sleeve 26, the screw rod 31 is a long straight column member, and an impact force generated by mechanical collision The direction coincides with the axial direction of the screw rod 31 . In addition, since the generated vibration and noise are relatively small, and the vibration and noise generated by the impact force can be dissipated relatively quickly on a long straight column, the electromagnetic expansion valve 100 has a lower limit of the rotor assembly 50 ), the noise generated by the motion state transition limitation is relatively reduced.

In one embodiment, the upper limit of the electromagnetic expansion valve 100 is implemented by mutual contact between the stop ring 532 and the stop portion 531a of the spring 531 . While the rotor 51 rotates and moves along the axis 103 so that the screw rod 31 drives the valve needle 22 to close the valve port 11 , the stop ring 532 is rotated by the spring 531 . ) followed by exercise. The stop ring 532 abuts against 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 electromagnetic expansion valve 100 , the upper limit of the electromagnetic expansion valve 100 is set at the screw rod 31 . It is determined by the mutual contact of the sleeve 40 with the one end far from the valve needle assembly 20 . By adjusting the size of the stop portion 531a and the stop portion 532 of the spring 531, the stop ring 532 is the stop portion ( 531a), the contact between the screw rod 31 and the sleeve 40 is set as the upper limit of the electromagnetic expansion valve 100 .

At this time, the upper limit of the electromagnetic expansion valve 100 is still determined by the screw rod 31 , and the screw rod 31 is a long straight column member, and the direction of the impact force generated by the mechanical collision is the axial direction of the screw rod 31 . coincides with Therefore, the generated vibration and noise are relatively small, and the vibration and noise generated by the impact force can be quickly dissipated on the long straight column body. Noise caused by state transition limitation is relatively reduced.

In addition, 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 screw rod 31 and the sleeve 40 have a relatively favorable connection performance.

In another embodiment, the upper limit of the electromagnetic expansion valve 100 may be further implemented by the mutual abutment of the guide seat 26 and the nut sleeve 32 , and the nut sleeve 32 is the guide seat 26 . touches on Since the guide seat 26 is fixedly connected to the screw rod 31 , the abutment of the nut sleeve 32 against the guide seat 26 restricts the screw rod 31 further from the valve port 11 . can do. At this time, by setting the length of the screw rod 31 , the screw rod 31 does not come into contact with the sleeve 40 when the nut sleeve 32 and the guide seat 26 come into contact with each other. Ensure that the upper limit is determined by the abutment between the nut sleeve 32 and the guide seat 26 .

Since the nut sleeve 32 is a relatively bulky return member, the noise caused by the impact force generated by the mechanical collision is relatively small, and the vibration and the noise caused by the vibration generated on the nut sleeve 32 are also rapidly dissipated. In the expansion valve 100 , noise generated due to the upper limit of the rotor assembly 50 movement state transition limitation is relatively reduced.

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

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

The lower limit mentioned herein means the maximum working position that moves from the screw rod 31 toward the valve port 11, and the working position is called the lower limit. The upper limit mentioned herein means the maximum working position that moves away from the valve port 11 on the screw rod 31, and the working position is called the upper limit. In the upper and lower limits, "upper" and "lower" are not concepts of orientation, and are only named for convenience of explanation.

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

In this embodiment, the electromagnetic expansion valve 100 is an electric electromagnetic expansion valve, and the rotor 51 is a motor rotor made of permanent magnets in a stepping motor. The stator assembly is a motor stator in the stepping motor, and the stepping motor receives the logic digital signal provided by the control circuit and transmits the signal to each phase coil of the motor stator. A motor rotor made of permanent magnets rotates by a magnetic torque action to implement a motion process that drives the stator assembly to rotate the rotor assembly.

The electromagnetic expansion valve 100 of the present application adopts an integrated valve seat, and by integrating the valve core seat and the sleeve seat of the conventional electronic expansion valve using the integrated valve seat, the number of times of assembly of the electromagnetic expansion valve 100 in the axial direction is reduced. . That is, the possibility that the coaxiality of each component of the electromagnetic expansion valve 100 may decrease due to multiple assembly times is reduced, and the degree of coaxiality between each component of the electromagnetic expansion valve 100 is improved. In addition, it is possible to ensure the valve opening performance of the electromagnetic expansion valve 100 by reducing the number of components, further improving the mounting easiness and improving the reliability and stability of the entire product.

Also, as shown in FIG. 7 , the valve port 11 is installed coaxially with the valve body 10 . One end at which the valve port 11 is opened is called 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 the second end 105 . is named The valve port 11 is opened to be transported along a direction pointing from the second end 105 to the first end 104 . By adopting the processing method of upper feed, the valve port of the valve body 10 is fitted only once during processing, so the number of times of mounting the valve port 11 of the valve body 10 during the manufacturing process is reduced, and the valve body during processing 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.

In addition, since the valve port 11 is directly opened on the valve body 10, the welding fixation between the valve seat core and the valve body for opening the valve port is reduced compared to the conventional electromagnetic expansion valve. The reduction in the number of welds improves the integrity of the valve body 10, so that the reliability and stability of the electromagnetic expansion valve 100 are improved.

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 . Therefore, the sealing performance of the valve needle 22 in the valve port 11 is improved, the internal leakage of the electromagnetic expansion valve 100 is reduced, and the control precision of the fluid flow rate of the electromagnetic expansion valve 100 is improved. can

A second chamfer 107 is installed at one end far from the second end 105 of the valve body 10 in the valve port 11 . Due to the opening of the first chamfer 106 and the second chamfer 107 , a burr that occurs during the processing of the valve port 11 is removed, and a smoother flow characteristic when the fluid medium passes through the valve port 11 . make to have

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

Also, in order to further block noise, the wall thickness at which 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 at which the valve body 10 and the guide sleeve 16 contact each other to 30% to 80% of the radius of the valve body 10, the noise is better blocked and the flow noise of the fluid medium is reduced to the valve body 10 ) can be sealed inside. 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 in fixing and mounting members such as the valve needle assembly 20 in the valve body 10 .

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

22, in order to reduce noise generated during use in the electromagnetic 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 stability when the fluid medium passes through the valve port 11 to reduce turbulence noise generated during use of the electronic expansion valve 100 .

As shown in FIG. 23 , an accommodating cavity 10f communicating with the valve port 11 is opened on the valve body 10 , and the accommodating cavity 10f is configured to accommodate the noise reduction module 60 . One end of the noise reduction module 60 extends outward in 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 part of the noise reduction module 60 and is installed to abut against 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 makes the noise reduction module 60 fit between the valve body 10 and the medium discharge pipe 102 to be fixed.

In another embodiment, it can be understood that the noise reduction module 60 may be fixed between the valve body 10 and the medium discharge pipe 102 by adopting a different structure. For example, the medium discharge pipe 102 may come in direct contact with the other end far from the valve port 11 in the noise reduction module 60, and in this case, the third protrusion 61 formed on the noise reduction module 60 is also omitted. can be

A noise reduction hole 62 is installed on the noise reduction module 60 , and the noise reduction hole 62 is docked to the valve port 11 . The noise reduction hole 62 has the diameter of the hole communicating with the valve port 11 matching the diameter of the valve port 11 so that the fluid medium flows into the noise reduction hole 62 through the valve port 11 smoothly is brought in It prevents turbulence 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 .

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-step 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 . A diameter of is larger than a diameter of the first hole 621 .

In this embodiment, in order to further reduce turbulence generated during fluid flow and to reduce noise when using the electromagnetic expansion valve 100, the first hole 621, the second hole 622, and the third hole 623 are It is installed coaxially with a symmetrical round hole.

Of course, if the turbulence that may occur due to structural asymmetry when the fluid passes through the stepped hole is not considered, the gap between the respective central axes 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 a shape of a deformed hole.

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

Hereinafter, the principle of the noise reduction module 60 reducing the fluid medium circulation 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 distribution cross-section is gradually expanded in a stepped shape. After the fluid medium is introduced into the noise reduction hole 62, the flow rate is slowed, and the generation of a free shear surface is suppressed through the noise reduction hole in which the fluid medium is gradually expanded. That is, the stability of the fluid medium is improved, and the fluid medium generates relatively little vortex noise, thereby reducing noise when the electromagnetic expansion valve 100 is used.

Also, referring to FIG. 25 together, in another embodiment, the noise reduction hole 62 is a horn hole, and the noise reduction hole 62 is a cylindrical hole 621a communicating with the valve port 11 and and 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 facing 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 of the noise reduction module 60 reducing the fluid medium circulation noise in this embodiment will be described.

The noise reduction hole 62 is a horn hole, and when the fluid medium flows into the noise reduction hole 62 through the valve port 11, the effective distribution cross-section is gradually enlarged. After the fluid medium is introduced into the noise reduction hole 62, the flow rate is slowed, and the generation of a free shear surface is suppressed through the noise reduction hole in which the fluid medium is gradually expanded. That is, the stability of the fluid medium is improved, and the fluid medium generates relatively little vortex noise, thereby reducing noise when the electromagnetic expansion valve 100 is used.

26 , in another embodiment, the noise reduction hole 62 is a straight hole. The noise reduction hole 62 passes through two end surfaces of the noise reduction module 60 and is docked to the valve port 11 , and the diameter of the noise reduction hole 62 matches the diameter of the valve port 11 .

Hereinafter, the principle of the noise reduction module 60 reducing the fluid medium circulation noise in this embodiment will be described.

The noise reduction hole 62 is a relatively long straight hole, and the noise reduction hole 62 corresponds to an extension of the valve port 11 . This makes the velocity 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 drop in a gradient. That is, the stability of the fluid medium is improved and the noise generated by the electronic expansion valve 100 during use is reduced.

In addition, the noise reduction module 60 is modularized and fixed in the valve body 10 , and the noise reduction module and the valve body 10 are separately installed. This makes it unnecessary to open the valve port 11 having a more difficult shape in the valve body 10 which is already relatively complicated in shape on the electromagnetic expansion valve 100 . Therefore, the electronic expansion valve 100 components can be further standardized by adopting a combination of the standardized valve body 10 and the customized noise reduction module for the electronic expansion valve 100 .

27 and 28, a welding ring 108 is further installed at one end of the medium discharge pipe 102 and the valve body 10 in contact. Two adjacent sides of the welding ring 108 contact the valve body 10 and the media outlet tube 102 respectively. The weld ring 108 is used to fill the weld joint 109 between the valve body 10 and the media outlet tube 102 . The welding ring 108 is melted under high-temperature heating of external welding equipment, and is introduced into the welding joint 109 formed between the valve body 10 and the medium discharge pipe 102 as a filler in a molten state, and the valve body 10 and Implement welding fixation to the medium discharge pipe 102 .

In addition, a welded structure 70 is further installed on the electromagnetic expansion valve 100 , and the welded structure 70 is disposed on one end close to the medium discharge pipe 102 in the valve body 10 on the valve body 10 axis line ( 103) and a fourth protrusion 71 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 between the valve body 10 and the medium discharge pipe 102. It is a weld 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 welding ring 108 and the valve body 10 contact end face, so that the welding ring 108 ) and the weld joint 109 may be coplanar. The coplanarity between the center of the welding ring 108 and the welding joint 109 is flat, so that the welding ring 108 smoothly flows into the welding joint 109 during welding to prevent welding deformation and welding dropout from occurring. .

The welded structure 70 further includes a convex edge 72 mounted on the medium outlet tube 102 . The medium discharge pipe 102 extends the fourth protrusion 71 along the axial line 103 direction of the valve body 10 to form a convex edge 72 . That is, the thickness of the medium discharge pipe 102 is greater than the radial extension length of the fourth protrusion 71 , and the welding ring 108 enters the welding joint 109 along the convex edge 72 in a molten state during welding. By doing so, it is possible to further improve the welding quality between the valve body 10 and the medium discharge pipe 102 .

The welded structure 70 further includes a third chamfer 73 installed on a cross section where the medium discharge pipe 102 and the valve body 10 contact each other. The third chamfer 73 connects the convex edge 72 and the outer surface of the medium discharge pipe 102 , and the welding 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 receiving space has an open structure, it is easier to fix the welding ring 108 on the valve body 10 and the medium discharge pipe 102, and the welding ring 108 is difficult to enter into the welding joint 109 during welding. It could be easier.

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

As shown in FIG. 2 , the electronic expansion valve 100 further includes a pressure balancing channel 80 . The pressure balancing channel 80 is used to balance the pressure of the medium at the inlet 10a and the pressure inside the electromagnetic expansion valve 100, thereby preventing the impact of the fluid medium on the guide sleeve 16 and reduce noise. In addition, when there is a change in the medium pressure of the inlet 10a, the pressure inside the electromagnetic expansion valve 100 is quickly balanced with the pressure of the inlet through the pressure balancing channel 80, so that the electronic expansion It is possible to prevent the occurrence of an additional load inside the valve 100 and to improve the operation stability of the electromagnetic 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 balancing channel 80 is used to communicate between the inside of the guide sleeve 16 and the valve body 10 , so that the fluid between the pressure of the fluid medium at the inlet 10a and the inside of the guide sleeve 16 . Balance the media pressure.

Also shown in FIG. 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. Thus, 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 11 . Through this, the impact of the fluid medium on the guide sleeve 16 can be prevented and noise can be reduced. In addition, when the system pressure changes, the internal pressure of the electronic expansion valve 100 can be quickly balanced, thereby preventing an additional load due to a pressure difference and improving the operation stability 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 balancing channel 80 . That is, the pressure of the valve cavity 12 and the pressures in the parts other than the valve cavity 12 inside the electromagnetic expansion valve 100 are balanced, so that the entire interior of the electromagnetic expansion valve 100 is in a pressure balanced state. In this way, an additional load is prevented from occurring in the electromagnetic 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. . Therefore, some fluid medium enters the guide hole 16a through the pressure balance hole 80a to achieve the purpose of pressure balance.

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

Also, the number of the pressure balancing holes 80a is two, and the two pressure balancing 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 the pressure balancing holes 80a may be 3, 4, etc., and the specific number of the pressure balancing holes 80a may be set according to actual demand.

Preferably, each of the pressure balancing holes 80a is a circular pressure balancing hole. Of course, in another embodiment, 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 30-34 , the pressure balancing channel 80 is installed between the mounting seat 110 , the guide sleeve 16 and the nut sleeve 32 . and is used to communicate between the inlet 10a and 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 . 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, inside the mounting seat 110, inside the nut sleeve 32 and inside the sleeve 40 are balanced. will achieve

The pressure balancing channel 80 includes a first balancing channel 81 and a second balancing 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 install the inside of the mounting seat 110 and the first balancing channel 81 to communicate. Therefore, through the first balancing channel 81 and the second balancing channel 82, the guide sleeve 16, the mounting seat 110, the nut sleeve 32, and the sleeve 40 are connected with each other. The inlets are in communication with each other. When the fluid medium flows in from the inlet 10a, a portion of the fluid medium passes through the first balancing channel 81 into the guide sleeve 16, the screw rod assembly 30, and the sleeve 40. is introduced into It flows into the inside of the mounting seat 110 through the second balance channel 82 so that the pressure of the medium 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 balancing 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 balance 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 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 communicate with each other to achieve the purpose of pressure balance.

Also, the first balance hole 811 has an axis, and the axis of the first balance 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 caused by the change in the flow direction of the fluid medium It can be seen that removing

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 the first balancing holes 811 may be 3, 4, etc., and the specific number of the 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 balance hole 812 has an axis, and the axis of the second balance hole 812 is installed perpendicular to the axis of the first balance hole 811 . Of course, in another embodiment, the axis of the second balance hole 812 may not be perpendicular to the axis of the first balance hole 811 .

The second balancing channel 82 includes the third balancing hole 821 , and the third balancing hole 821 is established 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. 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 balancing channel 81 are communicated through the third balancing hole 821, and the fluid medium of the inlet 10a is connected to the first balancing channel 81, the third It flows into the inside of the mounting sheet 110 through the balancing 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 axial direction of the valve body. The number of the third balance 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.

2 and 3 , the second balancing channel 82 may further include a fourth balancing hole 822 and a fifth balancing hole 823 . The fourth balancing hole 822 is established in the guide sleeve 16 , and the fifth balancing hole 823 is established on the nut sleeve 32 . The fourth balancing hole 822 communicates with the fifth balancing hole 823, and through the fourth balancing hole 822 and the fifth balancing hole 823, the inside of the guide sleeve 16 and the mounting sheet (110) Connect the inside. Here, by further installing the fourth balancing hole 822 and the fifth balancing hole 823 , the speed of balancing the pressure of the medium between the inside of the mounting sheet 110 and the inlet 10a can be improved.

In addition, the fourth balancing hole 822 is established on the second cylindrical section 163 , and the fifth balancing hole 823 is established on the matching section 321 . Communication between the mounting hole 111 and the guide hole 16a is realized through the fourth balancing hole 822 and the fifth balancing hole 822, so that the inside of the mounting sheet 110 and the first The communication between the balancing channels 81 is implemented.

The fourth balance hole 822 has an axis, and the fifth balance 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 vertical. is installed with Of course, in another embodiment, as long as the fourth balancing hole 822 and the fifth balancing hole 822 communicate with each other, the axis of the fourth balancing hole 822 and the fifth balancing hole 822 are connected to each other. It may be installed so that the axis lines do not overlap, and the axis line of the fourth balance hole 822 and the axis line of the first balance hole 811 may not be perpendicular to each other.

The technical features of the above-described embodiments may be arbitrarily combined. All possible combinations of technical features according to the above-described embodiments are not described for concise description, but all possible combinations of technical features should be regarded as within the scope described in the present invention unless there is a contradiction in the combinations of technical features.

Although the above-described embodiment is a representation of various embodiments of the present invention and the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent of the present invention. It should be noted that those skilled in the art to which the present invention pertains can make modifications and improvements without departing from the concept of the present invention, all of which fall within the protection scope of the present invention. Accordingly, the protection scope of the present patent is based on the appended claims.

Claims (12)

An electronic expansion valve comprising:
a valve body, a valve needle assembly, a screw rod assembly, a rotor assembly, a stator assembly, and a sleeve, wherein a guide sleeve is installed inside the valve body to guide the valve needle assembly to move, the valve needle assembly comprising the installed on the guide sleeve, the screw rod assembly is connected to the rotor assembly, the stator assembly can act on the rotor assembly to drive the rotor assembly to rotate, the rotation of the rotor assembly is drive the screw rod assembly to move, a valve port is opened on the valve body, the valve needle assembly opens and closes the valve port under the driving of the screw rod assembly, and the sleeve moves the valve from the valve body Electromagnetic expansion valve, characterized in that it is installed so as to cover one end away from the port. According to claim 1,
A medium discharge pipe is connected on the valve body, the fluid medium flows into the medium discharge pipe after passing through the valve port and is discharged to the outside through the medium discharge pipe, and a noise reduction module is installed between the medium discharge pipe and the valve body and a noise reduction hole is opened on the noise reduction module, the noise reduction hole is docked to the valve port, and a hole diameter of one end docked with the valve port in the noise reduction hole matches the hole diameter of the valve port Electronic expansion valve, characterized in that. 3. The method of claim 2,
the noise reduction hole is a multi-stage stepped hole, and the stepped hole gradually expands in a direction away from the valve port; or the noise reduction hole includes a conical hole that gradually expands in a direction away from the valve port; or the noise reduction hole is a straight hole passing through two end surfaces of the noise reduction module. According to claim 1,
A welding ring and a first projection are installed on the valve body, the welding ring is in contact with the medium discharge pipe, the first projection is located at one end close to the medium discharge pipe in the valve body, the first projection and the medium discharge pipe A weld joint is formed therebetween, and the center of the weld ring is flush with the weld joint. According to claim 1,
The valve needle assembly includes a valve needle, an elastic member, a bearing, and a gasket, and one end of the valve needle abuts against the elastic member, the other end is configured to match the valve port, and the bearing has an outer ring and an inner ring and an inner ring of the bearing is fixedly connected to the screw rod, one end of the gasket is in contact with the outer ring of the bearing, and the other end of the gasket is in contact with the elastic member. According to claim 1,
One end at which the valve port is installed on the valve body is referred to as a first end, and an end opposite to the first end on the valve body is referred to as a second end, and the valve port extends from the second end to the first end. An electronic expansion valve that is opened to be transported along a direction pointing to a stage. 7. The method of claim 6,
An electromagnetic expansion valve, wherein a first chamfer is provided on the valve port in an end face closer to the second end, and a second chamfer is installed in an end face away from the second end on the valve port. 7. The method of claim 6,
an electromagnetic expansion valve wherein a wall in said valve body in contact with said guide sleeve has a thickness of 30% to 80% of a radius of said valve body. According to claim 1,
The electronic expansion valve further includes a pressure balancing channel, and an inlet through which a fluid medium flows is established on the valve body, the pressure balancing channel communicates with the inlet and an inside of the electronic expansion valve, so that the fluid at the inlet is in communication An electronic expansion valve for causing a medium pressure to be balanced with a fluid medium pressure within the electronic expansion valve. 10. The method of claim 9,
a mounting seat is installed on the valve body, the mounting seat is mounted on the valve body, the sleeve is mounted on the mounting seat, and the pressure balancing channel connects the inlet to the inside of the guide sleeve, the mounting seat communicate with the interior, the interior of the screw rod assembly and the interior of the sleeve, such that the fluid medium pressure at the inlet is balanced with the pressure of the fluid medium within the guide sleeve, inside the mounting seat, inside the screw rod assembly and inside the sleeve Electronic expansion valve. 11. The method of claim 10,
the pressure balancing channel includes a first balancing channel and a second balancing channel, the first balancing channel configured to communicate the inlet with the guide sleeve interior, the screw rod assembly interior, and the sleeve interior; and two balancing channels are configured to communicate the inside of the mounting seat with the first balancing channel. According to claim 1,
A mounting cavity in communication with the valve port is further opened on the valve body, the guide sleeve is mounted in the mounting cavity to have an interference fit with the mounting cavity, and a debris storage structure is installed between the valve body and the guide sleeve and the debris storage structure is configured to store debris between the valve body and the guide sleeve.

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