WO2015143845A1

WO2015143845A1 - Valve base assembly for electronic expansion valve and manufacturing method thereof

Info

Publication number: WO2015143845A1
Application number: PCT/CN2014/086175
Authority: WO
Inventors: 詹才意; 舒小辉; 张金荣
Original assignee: 浙江三花股份有限公司
Priority date: 2014-03-25
Filing date: 2014-09-10
Publication date: 2015-10-01

Abstract

A valve base assembly for an electronic expansion valve and manufacturing method thereof, the valve base assembly comprising: a valve base (12) provided with a valve cavity (121); a second connecting tube (14) fixedly connected to the side wall of the valve base (12), wherein a first central axis (S1) of the second connecting tube (14) is perpendicular to a second central axis (S2) of the valve base (12); along any cross section on which the first central axis (S1) is located, the edge surface (1431) of the second connecting tube (14) does not surpass the inner circumferential surface (1211) of the valve cavity (121). The present valve base assembly ensures that the end part of the second connecting tube (14) does not extend into the valve cavity (121) and will not damage the integrity of the valve cavity (121), which is beneficial for improving the noise during the flow of refrigerant caused by irregular cavity shape. In addition, the coordinating length of the connecting tubes (13, 14) and the valve base (12) can be fully ensured, which is beneficial for improving welding strength, and the consistency of the size of the connecting tubes (13, 14) assembly can also be ensured.

Description

Valve seat assembly of electronic expansion valve and manufacturing method thereof

Technical field

The present invention relates to the field of control valves, and more particularly to a valve seat assembly for an electronic expansion valve for regulating fluid flow and a method of manufacturing the same.

Background technique

In various refrigeration and heating equipment such as air conditioners, refrigerators, and heat pump water heaters, an electronic expansion valve is usually used to regulate the flow rate of the fluid. In addition, the electronic expansion valve can also be used as a pilot valve in a solenoid valve.

The electronic expansion valve generally includes a valve seat assembly, a nut assembly, a valve needle screw assembly and a rotor assembly. The valve seat assembly generally includes a valve seat and a connecting tube. The valve seat has a valve port, and the valve seat and the connecting tube are usually welded into one body. The needle of the needle screw assembly is mounted in the nut of the nut assembly.

In order to solve the problem of the coaxiality of the valve port and the valve needle, the nut and the like, the applicant proposes to provide the valve core seat 11 on the valve seat in the Chinese patent application No. 201110374661.7, as shown in FIG. An upper guiding section and a lower guiding section are disposed on the nut, and the valve core seat 11 and the valve seat 12 and the first connecting pipe 13 and the second connecting pipe 14 fixed on the valve seat 12 together form a valve seat assembly, and the inner cavity of the valve seat 12 forms a valve. The cavity 121, the outer peripheral wall of the upper end of the valve core seat 11 is fitted and fixed to the inner peripheral wall of the lower end of the nut 32, and the inner peripheral wall of the upper end of the valve core seat 11 forms a clearance fit with the valve needle 21, and guides the valve needle 21. Further, the upper end of the nut 32 provides guidance for the screw 22 that is fixed to the valve needle 21. The design of this structure solves the technical problem of the concentricity of the valve needle and the valve port. However, the electronic expansion valve of this structure still has some room for improvement in noise reduction.

As shown in FIG. 1, since the second connecting tube 14 is inserted into the valve seat 12, the end of the connecting tube protrudes into the valve chamber 121 formed by the valve seat 12, thus destroying the integrity of the valve chamber 121 to a certain extent, so that the original It is a cylindrical space (after assembling the valve core seat 11 and the valve needle 21, the space can be approximated as a ring The shape space becomes irregular. When the refrigerant enters the valve chamber 121, it is likely to cause interference during the flow, thereby causing the bubble in the liquid refrigerant to rupture, thereby generating noise. In addition, the end of the second joint 14 projects into the valve chamber, and the length of the end portion cannot be accurately controlled, so that the uniformity of the fitting size of the joint cannot be ensured.

Therefore, how to develop a kind of noise reduction noise generated by designing the valve cavity and the flow channel on the basis of the prior art, and at the same time, the size of the take-up assembly can be kept consistent, which is advantageous for mass production, and is in the field. Technical problems that technicians need to solve.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve seat assembly for an electronic expansion valve which, by improving the design of the valve chamber and the flow passage, can effectively avoid interference with the refrigerant and thereby reduce noise. To this end, the present invention adopts the following technical solutions:

A valve seat assembly for an electronic expansion valve including a valve seat having a valve chamber; and a second socket fixedly coupled to a sidewall of the valve seat, wherein a first central axis of the second nozzle The second central axis of the valve seat is vertically disposed; wherein, in any section along the first central axis, the edge face of the second nozzle does not exceed the inner circumferential surface of the valve cavity.

Preferably, in a possible implementation, the valve seat comprises a base portion and a bottomed bottom portion integral with the base portion, the base portion is provided with a side hole, and the second socket is The side holes are mated and fixedly connected.

Preferably, in a possible implementation manner, the second connecting tube has a main body portion, a small diameter portion and an edge portion, the small diameter portion extending into the side hole, the edge surface being located at an inner circumference of the valve cavity On the surface.

Optionally, in a possible implementation manner, the second nozzle is a straight tube, and the main body portion is further provided with a positioning recess for positioning.

Optionally, in a possible implementation manner, the second connecting tube is a bent pipe, and has a A horizontal section in which the side holes are fitted and a vertical section which is disposed substantially perpendicular to the horizontal section.

Preferably, in a possible implementation, the second socket and the valve seat are fixed by press fitting and welding.

The valve seat assembly of the electronic expansion valve provided by the invention sets the intersection line of the edge surface of the second nozzle and the side wall of the valve seat to not exceed the inner circumferential surface of the valve cavity, thereby ensuring that the end of the second nozzle does not Extending into the valve cavity does not damage the integrity of the valve cavity, which is beneficial to improve the noise caused by the irregular shape of the cavity when the refrigerant flows.

In a possible implementation, the valve seat assembly of the electronic expansion valve according to the present invention further includes: a substantially cylindrical valve seat with a valve port fixed to the valve seat, wherein a central axis of the valve core seat coincides with a second central axis of the valve seat, and a circumferential communication sidewall of the valve core seat is provided with a plurality of communication holes, the communication hole is a cavity and a cavity of the valve core seat The valve chamber is connected. In order to prevent the refrigerant directly from directly impacting the valve needle, and to ensure that the flow rate of the refrigerant of each of the communication holes of the valve core seat is balanced, thereby reducing noise, the central axes of the plurality of communication holes are located on the first plane, the first central axis Higher than the first plane.

Preferably, in a possible implementation, the minimum projection angle of the central axis of the communication hole and the first central axis of the second nozzle in the horizontal direction is not less than 20°.

Optionally, in a possible implementation manner, the number of the communication holes is three, and a minimum projection angle between a central axis of the communication hole and a first central axis of the second connector in a horizontal direction is not Less than 45°.

Optionally, in a possible implementation manner, the number of the communication holes is four, and a minimum projection angle between a central axis of the communication hole and a first central axis of the second connector in a horizontal direction is not Less than 30°.

Optionally, in a possible implementation manner, the number of the communication holes is 5 or more, and the minimum projection clip of the central axis of the communication hole and the first central axis of the second connector is horizontal. The angle is not less than 25°.

Preferably, in a possible implementation manner, the number n of the communication holes satisfies the relationship: n·π·d ₁ ² /4≥2·π·d ₂ ² /4, where d ₁ is The diameter of the communicating hole, d ₂ is the diameter of the valve port.

At the same time, the present invention also provides a method for manufacturing a valve seat assembly of an electronic expansion valve, which comprises the following steps:

S11. Positioning or tightly positioning the valve seat and the valve core seat by laser welding;

S21, pressurizing the first nozzle on the third step portion of the valve core seat;

S31, pressing the second nozzle into the side hole of the valve seat;

S41, performing welding, so that the valve core seat, the valve seat, the first connecting pipe and the second connecting pipe form a valve seat assembly;

The sequence of the foregoing step S11, step S21 and step S31 may be interchanged, and before the step S31 is implemented, the following steps are further included:

S30, processing the edge portion, using an outer cylindrical surface equal to the inner diameter of the valve cavity or slightly larger than the inner diameter of the valve cavity, cutting the end surface of the second connecting pipe in a direction perpendicular to the first central axis of the second connecting pipe, thereby forming an edge unit.

Preferably, in a possible implementation, the step S31 is specifically: using mechanical positioning or photoelectric positioning, the third central axis of the side hole is set at a designated position, and the first central axis of the second connecting tube is The third central axis coincides, and the second nozzle is press-fitted to the valve seat.

Preferably, in a possible implementation, during the press fitting, the valve seat is further provided with a positioning pin, and the outer diameter of the positioning pin is substantially the same as the inner diameter of the valve cavity of the valve seat.

Thus, by the above-mentioned press-fit method, the mating length of the take-up and the valve seat can be sufficiently ensured, the welding strength is improved, and the uniformity of the take-up assembly size can be ensured.

In a possible implementation manner of the method of manufacturing the valve seat assembly of the electronic expansion valve of the present invention, the step S11 includes:

S11a adopts photoelectric positioning or mechanical positioning to ensure that the plane formed by the third central axis of the side hole of the valve seat and the second central axis of the valve seat is located at a designated plane, and the valve seat is fixed by tooling;

S11b adopts photoelectric positioning or mechanical positioning to ensure that the plane formed by the central axis of the communicating hole of the valve core seat and the central axis of the valve core seat is located at a designated plane, and the valve core seat is fixed by tooling;

S11c, setting the rotation angle β, rotating the positioning tool of the valve core seat or the positioning tool of the valve seat, the plane of the third central axis and the second central axis of the valve seat and the central axis of the communication hole and the valve core seat The plane formed by the central axis is at an angle α, so that the two toolings of step S11a and step S11b are combined;

S11d, performing welding to fix the valve core seat and the valve seat.

Optionally, in a possible implementation manner, the order of the step S11a and the step S11b may be interchanged.

According to the method of manufacturing the valve seat assembly of the electronic expansion valve of the present invention, in another possible implementation, the step S11 includes:

S11b', using photoelectric positioning or mechanical positioning, ensuring that the plane formed by the central axis of the communication hole of the valve plug seat and the central axis of the valve core seat is located at the third central axis in step S11a and the second central axis S2 of the valve seat Forming a plane into an a-angle plane, and fixing the valve core seat with a tooling;

S11c', combining the two tooling of step S11a and step S11b;

S11d, performing welding to fix the valve core seat and the valve seat.

Optionally, in a possible implementation manner, the position of the side hole or the communication hole is marked by a scribe line.

In this way, the central axis of the second nozzle is set higher than the central axis of the communication hole on the valve core seat, and the projection angle of the central axis of the communication hole and the central axis of the second nozzle on the horizontal plane is at least 20° or more. Effectively prevent the refrigerant from directly passing through the communication hole, causing an impact on the valve needle, thereby reducing the generation of noise. In addition, when the refrigerant flows in from the second nozzle, it does not directly enter the communication hole. The buffering of the side wall of the valve core seat ensures the flow of the refrigerant in each of the communication holes to balance, thereby further reducing the noise.

DRAWINGS

Figure 1: Schematic diagram of a prior art electronic expansion valve;

2 is a schematic structural view of an electronic expansion valve provided by the present invention;

Figure 3 is a cross-sectional view taken along line D-D of Figure 2;

Figure 4: Schematic diagram of the structure of the valve core seat of Figure 2;

Figure 5: Schematic diagram of the valve seat of Figure 2;

6 is a schematic view showing a first embodiment of a second nozzle of an electronic expansion valve provided by the present invention;

Figure 7 is a schematic view showing the processing of the second nozzle shown in Figure 6;

Figure 8 is a schematic view showing a second embodiment of the second nozzle of the electronic expansion valve provided by the present invention;

Figure 9 is a schematic view showing the processing of the second nozzle shown in Figure 8;

Figure 10: A-A cross-sectional view of Figure 9;

Figure 11 is a schematic view showing the second adapter pipe fitting of the electronic expansion valve provided by the present invention;

Figure 12 is a schematic view showing the assembly of the electronic expansion valve seat assembly provided by the present invention;

Figure 13 is a schematic view showing another assembly of the electronic expansion valve seat assembly provided by the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 2. FIG. 2 is a schematic structural view of an electronic expansion valve provided by the present invention.

The electronic expansion valve provided by the present invention includes a valve seat assembly, a nut assembly, a valve needle screw assembly, and a magnetic rotor assembly.

The nut assembly includes a nut 32 and a connecting piece 31, and the connecting piece 31 is integrally formed as an insert and a nut 32. The connecting piece 31 is welded and fixed to the valve seat 12. The nut 32 is threadedly engaged with the lead screw 22 by an internally threaded section provided in the middle. A guide section is provided at an inner edge portion of the lower portion of the nut 32. In the inner hole of the upper part of the nut 32, a screw guiding section is provided which cooperates with the screw rod 22, and the screw guiding section can be disposed on the upper side or the lower side of the threaded section of the nut 32 and the threaded rod 22, to facilitate The guide when the screw is rotated. The outer circumference of the upper portion of the nut 32 is fitted with a spring guide 33 and a stop slip ring 34.

The needle screw assembly includes a lead screw 22 and a valve needle 21 driven by the lead screw 22. In the present embodiment, one end of the lead screw 22 is coupled to the valve needle 21 and the other end is coupled to the magnetic rotor member 41. Among them, the screw 22 and the valve needle 21 are arranged to be rotatable relative to each other, but are not relatively disengaged.

The outer portion of the valve seat 12 is fixed with a cover 5 to form a sealed space in which a magnetic rotor member 41 is disposed. In the present embodiment, the magnetic rotor member 41 includes a magnetic rotor body, a rotor stop portion 42, and a connection therebetween. The connecting body, the magnetic rotor member is fixed to the upper end of the screw shaft 22.

The working principle of the above electronic expansion valve is that the magnetic rotor component 41 is rotated by a solenoid (not shown) and drives the screw 22 to rotate together. The screw 22 and the nut 32 are screwed together, so that the screw 22, while rotating, also moves up and down in the axial direction, thereby causing the needle 21 to move up and down, so that the valve needle 21 can open and close the valve port 112.

3, FIG. 4, and FIG. 5, wherein FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2, FIG. 4 is a schematic structural view of the valve core seat of FIG. 2, and FIG. 5 is a schematic structural view of the valve seat of FIG.

The valve seat assembly includes a spool seat 11 and a valve seat 12. The valve seat 12 has a substantially cylindrical structure with a fitting hole with the valve core seat at the bottom, and a valve chamber 121 is formed inside thereof. In the present embodiment, the valve seat assembly further includes a first nozzle 13 and a second nozzle 14. The spool seat 11, the valve seat 12, the first nozzle 13, and the second nozzle 14 are fixedly coupled to form a valve seat assembly.

The second connecting tube 14 is fixedly connected to the side wall of the valve seat 12. Specifically, the side hole 12c may be disposed on the side wall of the valve seat 12 in a direction perpendicular to the central axis of the valve seat 12, and then the second connecting tube 14 and the side hole may be provided. After the 12c is engaged, the welding is fixed, such that the first central axis S1 of the second joint 14 is perpendicular to the central axis of the valve seat.

Since the spool seat 11 and the valve seat 12 are coaxially disposed, the central axes of the two are coincident, and therefore, the first central axis S1 of the second joint 14 is disposed substantially perpendicular to the central axis of the spool seat 11.

As shown in FIG. 4, the spool seat 11 has a substantially cylindrical structure and has a base portion 114. The upper end portion of the base portion 114 is provided with a first step portion 115, and the lower end portion is provided with a second step portion 116 and a third step portion 117 in this order. A valve port 112 is formed at a lower end portion of the valve body seat 11. In the present embodiment, the valve port 112 includes a first tapered portion 1121, a straight portion 1122, and a second tapered portion 1123 which are sequentially disposed. The first tapered portion 1121 is for engaging with the valve needle 21 to control the flow rate of the electronic expansion valve.

The spool seat 11 is internally provided with a guide hole 111 which can guide the valve needle 21 when the valve needle 21 is fitted to the spool seat 11.

A plurality of communication holes 113 are formed in the circumferential side wall of the spool seat 11, and the inner cavity of the valve core seat 11 is communicated with the valve chamber 121.

As shown in Fig. 5, the valve seat 12 has a substantially cup shape, and has a base portion 12b and a bottom portion 12e integrally formed with the base portion 12b. A bottom portion 12d is formed on the bottom portion 12e for fixed connection with the valve core seat 11. A side hole 12c is defined in the side wall of the base portion 12b. When assembled, the second connecting tube 14 is press-fitted and welded to the valve seat 12 through the side hole 12c.

The top of the valve seat 12 is provided with a step portion 12a for fixed connection with the outer cover 5. At the time of installation, the outer cover 5 is abutted against the step portion 12a, so that the coaxiality of the outer cover 5 and the valve seat 12 can be ensured.

The valve chamber 121 formed by the base portion 12b of the valve seat 12 has an inner circumferential surface 1211.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of a first embodiment of a second nozzle of the electronic expansion valve provided by the present invention.

The second nozzle 14 is an elbow that includes a body portion 141 and a horizontal section 1411 for mating with the valve seat 12, and a vertical section 1412 that is disposed substantially perpendicular to the horizontal section 1411 after bending. It should be noted that the horizontal and vertical directions referred to in this embodiment are based on the view shown in FIG. 6, and are not to be construed as limiting the protection range.

At an end of the horizontal section 1411, a small diameter portion 142 having a diameter smaller than the main body portion 141 is provided, Among them, the small diameter portion 142 is directly press-fitted to the side hole 12c opened in the valve seat 12. Specifically, the side hole 12c may be disposed on the side wall of the valve seat 12 in a direction perpendicular to the central axis of the valve seat, and then the small diameter portion 142 of the second connecting tube 14 and the side hole 12c may be press-fitted and then fixed by welding, so that The first central axis S1 of the second nozzle 14 is disposed perpendicular to the second central axis S2 of the valve seat 12.

The end portion of the small diameter portion 142 is further provided with an edge portion 143 having a certain shape, and the edge portion 143 has an edge surface 1431. In the present embodiment, when the small diameter portion 142 is assembled with the valve seat 12, the first central axis S1 is used as a reference. The edge surface 1431 of the second nozzle 14 does not exceed the inner circumferential surface 1211 of the valve chamber 121 in all of the sections passing through S1.

It should be noted that “not exceeding” as used herein means that the second nozzle 14 does not enter the inside of the inner circumferential surface 1211 in any section passing through the first central axis S1. It should be understood by those skilled in the art that due to the inevitable error in the processing and other objective reasons, it is possible that the edge 1431 of the second nozzle 14 of the actual product may slightly exceed the inner circumferential surface 1211 of the valve cavity 121, for example, some solder may Slightly overflowing. Therefore, the edge surface 1431 of the second nozzle 14 slightly protruding from the inner circumferential surface 1211 of the valve chamber 121 by any reason should be based on the technical idea of the present invention and should fall within the protection scope of the claims.

Although the edge surface 1431 of the second nozzle 14 can have a certain gap with the inner circumferential surface 1211, a similar effect can be obtained. However, as a preferred embodiment, the edge surface 1431 can be disposed to coincide with the inner circumferential surface 1211, that is, After the small diameter portion 142 extends into the side hole 12c, the edge surface 1431 is located on the inner circumferential surface 1211. Specifically, when the edge portion 143 is machined, as shown in FIG. 7, the outer cylindrical surface 50 having the same diameter as the inner diameter of the valve chamber 121 or slightly larger than the inner diameter of the valve chamber 121 is cut in a direction perpendicular to the first central axis S1. The end face of the second nozzle 14. The outer cylindrical surface 50 is a virtual concept. In actual operation, it may be a cylindrical cutting tool or a wire cutting method, and only a cross section may be cut on the end surface of the second connecting pipe 14 The arcuate edge surface 1431 is sufficient. Based on the teachings provided by the present application, those skilled in the art can apply the edge face 1431 to the end face of the nozzle using any other suitable processing method in the art. In order to ensure the assembly of the take-up, the cutting direction is perpendicular to The first central axis S1 is also along the direction of the vertical section 1412 (i.e., perpendicular to the plane of the drawing in Fig. 7), and the central axis of the cylindrical surface 50 intersects the first central axis S1, thereby forming the edge portion 143 and the edge. The face 1431, such that the edge face 1431 can coincide with the inner circumferential surface 1211, that is, on the same circumferential surface.

Please refer to FIG. 11 , which is a schematic diagram of the second adapter pipe fitting of the electronic expansion valve provided by the present invention. In order to ensure that the edge surface 1431 overlaps the inner circumferential surface 1211, a positioning pin 60 is placed in the valve cavity 121 during press fitting, and the positioning pin 60 has a circular cross section, and the inner diameter thereof is set to be substantially the outer diameter of the valve core seat 11. Equally, the outer diameter thereof is set to be substantially equal to the inner diameter of the valve cavity 121 of the valve seat 12, so that when the second joint 14 of the processed edge portion 143 is pressed in, when the edge portion 143 contacts the positioning pin 60, The movement is stopped, so that the edge surface 1431 and the inner circumferential surface 1211 of the valve seat are ensured to be on the same circumferential surface. This processing method is advantageous for ensuring the mating length of the take-up and the valve seat during mass production, which is advantageous for improving the welding strength and ensuring the uniformity of the take-up assembly size.

Next, a second embodiment of the second nozzle 14 will be described with reference to Figs. 8 to 10 .

Please refer to FIG. 8. FIG. 8 is a schematic view of a second embodiment of the second expansion tube of the electronic expansion valve provided by the present invention, FIG. 9 is a schematic view of the processing of the second connection tube shown in FIG. 8, and FIG. 10 is a diagram of FIG. 6 and FIG. A section view.

The second connecting pipe 14 is a straight pipe, that is, it does not have a bent portion as compared with the first embodiment, and since the vertical segment corresponding to the first embodiment is not provided, the edge must be considered when processing the edge portion 143 and assembling. The direction of the face 1431. For smooth assembly, one or more positioning pockets 145 are provided on the outer circumferential wall of the main body portion 141, and the fourth central axis S4 of the positioning recess 145 intersects with the first central axis S1 of the second nozzle 14, at this time, The four central axis S4 and the first central axis S1 define a plane P2 (not shown).

When the edge portion 143 is processed, the positioning is performed by the positioning recess 145, and the outer cylindrical surface 50 having the same diameter as the inner diameter of the valve chamber 121 or slightly larger than the inner diameter of the valve chamber 121 is cut along the direction perpendicular to the plane P2. The end surface of the nozzle 14 and the central axis of the outer cylindrical surface 50 and the first central axis of the second joint 14 S1 intersects to form the edge portion 143 and the edge surface 1431. The outer cylindrical surface 50 is a virtual concept. In actual operation, it may be a cylindrical cutting tool or a wire cutting method, and only a cross section may be cut on the end surface of the second connecting pipe 14 The arcuate edge surface 1431 is sufficient. Based on the teachings provided by the present application, those skilled in the art can apply the edge face 1431 to the end face of the nozzle using any other suitable processing method in the art. At the time of press fitting, the second joint 14 is positioned with the positioning recess 145 such that the plane P2 is perpendicular to the central axis S2 of the valve seat 12. Wherein, the axis of the cutting tool may be at an angle α with the third central axis S3 at the projection surface, and at the time of press fitting, the third central axis S3 and the second central axis S2 are also at an angle α of the projection surface.

Further, the above-described positioning recess 145 is also applicable to the case where the second joint 14 is a bent pipe, as shown in FIG. 6, and at the same time referring to FIG. 10 (the same as the A-A view of FIGS. 6 and 9). The second nozzle 14 may first be provided with a positioning recess 145 in the main body portion and then the edge surface 1431 is processed by the method provided in the second embodiment. Then, the positioning pit 145 is used for positioning and bending operation to form a bent pipe. This manufacturing method can be easily mass-produced and the product size can be ensured.

Those skilled in the art can make corresponding equivalent substitutions based on the description of the above embodiments.

For the valve seat assembly of the electronic expansion valve provided by the present invention, the manufacturing method may specifically include the following steps:

S11. Positioning or tightly positioning the valve seat 12 and the valve core seat 11 by laser welding;

S21, the first nozzle 13 is press-fitted on the third step portion 117 of the valve core seat 11;

S31, press the second nozzle 14 into the side hole 12c of the valve seat 12;

S41, performing welding, so that the valve core seat 11, the valve seat 12, the first connecting pipe 13, and the second connecting pipe 14 form a valve seat assembly.

It can be understood that the order of the above steps S11, S21 and S31 can be interchanged. The process of taking over the press has been described in detail above and will not be described here.

Before the step S31, the step S30 may be further included, and the edge portion 143 is processed, and the outer cylindrical surface which is equal to the inner diameter of the valve chamber 121 or slightly larger than the inner diameter of the valve chamber 121 is perpendicular to the first The direction of the central axis S1 cuts the end face of the second joint 14, thereby forming the edge portion 143.

The pressing step of step S31 is specifically: using mechanical positioning or photoelectric positioning, the third central axis S3 of the side hole 12c is set at a designated position, and the central axis S1 of the second connecting tube 14 is coincident with the third central axis S3, thereby The second nozzle 14 is press-fitted to the valve seat 12.

According to the valve seat assembly of the electronic expansion valve of the present invention, in another possible implementation, a plurality of chambers disposed on the circumferential side wall of the valve core seat 11 and communicating the inner cavity of the valve core seat 11 with the valve chamber 121 The communication holes 113 are evenly distributed on the circumferential side wall of the spool seat 11, and are located on the same horizontal plane (set to the first plane P1), that is, the central axis S2' of the communication hole 113 is located on the first plane P1.

In the direction shown in FIG. 2, the first center axis S1 of the second nozzle 14 is higher than the first plane P1. It should be noted that “above” as used herein refers to the position of the first nozzle 13 as the bottom and the position of the outer cover 5 as the top in the view of FIG. 2, and the first central axis S1 is opposite to the first A plane P1 is closer to one side of the outer cover 5.

Thus, when the refrigerant flows into the first inner cavity 121 from the second nozzle 14, the flow path does not face the plane in which the communication hole 113 is located, and does not cause an impact on the communication hole 113, and does not cause an impact on the valve needle. It can effectively reduce the noise caused by the refrigerant impacting the valve needle. In contrast, in the valve seat assembly of the prior art electronic expansion valve shown in FIG. 1, since the spool seat 11 is not defined in the mounting direction, that is, the orientation of the communication hole 113 on the spool seat 11 cannot be controlled, Therefore, when the refrigerant flows in from the second nozzle 14, it is possible to directly pass through the communication hole 113 in the flow direction, thereby causing an impact on the valve needle 21 and generating noise.

The number of the communication holes 113 can be selected in accordance with the diameter of the communication hole and the diameter of the valve port. The number satisfies the relationship: n·π·d ₁ ² /4≥2·π·d ₂ ² /4. Wherein d ₁ is the diameter of the communication hole 113 and d ₂ is the diameter of the valve port 112.

The minimum projection angle α of the central axis S2' of the communication hole 113 and the first central axis S1 of the second joint 14 in the horizontal direction is not less than 20° as shown in FIG. The minimum projection angle described herein refers to the smallest angle formed by the central axis of the plurality of communication holes 113 with the first central axis S1.

When the number of the communication holes 113 is three, the minimum projection angle α is not less than 45°.

When the number of the communication holes 113 is four, the minimum projection angle α is not less than 30°.

When the number of the communication holes 113 is 5 or more, the above-described minimum projection angle α is not less than 25°.

Taking the four communication holes shown in FIG. 3 as an example, since the communication holes 113 are evenly distributed on the side wall of the valve core seat 11, the central axis of the adjacent two communication holes has an angle of 90°. The projection angle α can be set to 45°, so that when the refrigerant enters the valve chamber 121 from the second connecting tube 14, it will contact the outer side wall of the valve core seat 11 without directly impacting the valve needle in the communication hole 113, thereby Can reduce the noise generated.

On the basis of 45° shown in Fig. 3, the spool seat 11 is also allowed to deflect a certain degree, but the minimum projection angle α cannot be lower than 30°. If it is lower than 30°, the refrigerant still has a part directly connected. The hole 113 causes an impact on the valve needle 21.

Next, a method of manufacturing the valve seat assembly of the embodiment will be described.

As shown in FIG. 12, the side hole 12c of the valve seat 12 is found by photoelectric positioning or mechanical positioning, and the plane formed by the third central axis S3 of the side hole 12c and the second central axis S2 of the valve seat 12 is located at a specified plane. Specifically, the position of the base portion 12b or the step portion 12a of the valve seat 12 may be clamped by the first pneumatic chuck 41.

Simultaneously or in advance with the above steps, the photoelectric communication or mechanical positioning method is also used to find the communication hole 113 of the valve core seat 11, and the plane of the central axis S2' of the communication hole 113 and the central axis of the valve core seat 11 is located. On the designated plane, the second pneumatic chuck 42 can be used to clamp the position of the base 114 or the guide hole 111 in a specific operation.

Then, the rotation angle β is set, and the first pneumatic chuck 41 or the second pneumatic chuck 42 is rotated to make the plane formed by the first central axis S1 and the second central axis S2 of the valve seat 12 and the central axis S2' and the valve core seat. The plane formed by the central axis of 11 is at an angle α, the position of the step portion 12a and the position of the communication hole 113 determined according to the previous step are brought together, and an angle of an angle α is formed, so that the spool seat 11 and The valve seat 12 fits together and forms an angle α. Then carry out the welding, the valve seat 12 and The spool seat 11 is fixed. Finally, the first nozzle 13 and the second nozzle 14 are respectively assembled to the valve seat 12, and welding is performed to form a valve seat assembly.

As an alternative embodiment, it is also possible to simultaneously determine the angle α when the communication hole 113 of the valve body seat 11 is positioned, that is, to ensure the center of the communication hole 113 of the valve core seat 11 by photoelectric positioning or mechanical positioning. A plane formed by the axis S2' and the central axis of the spool seat 11 is located at a plane at an angle α between the second central axis S2 of the valve seat 12 and the plane of the first central axis S1 of the second joint 14, and the valve core is fixed by tooling. Block 11. Then, as in the first embodiment described above, the first pneumatic chuck 41 and the second pneumatic chuck 42 are brought together, welding is performed, the valve seat 12 is fixed to the valve core seat 11, and finally, the first nozzle 13 is again And the second joint 14 are respectively fitted to the valve seat 12, and welding is performed to form a valve seat assembly.

In addition to the positioning method described above, the position of the side hole 12c and the communication hole 113 may be determined by a method of marking. Referring to FIG. 13, FIG. 13 is another schematic view of the assembly of the electronic expansion valve seat assembly provided by the present invention.

The position of the side hole 12c is marked on the valve seat by a scribe line such that the scribe line is on the same plane as the center line of the side hole 12c, the plane being perpendicular to the bottom end surface of the valve seat 12; likewise, in the spool seat 11 The position of the communication hole 113 is indicated by a scribe line so that the scribe line is at an angle α with the plane of the center line of the side hole 12c, and then the spool seat 11 and the valve seat 12 are placed on the tooling 43. The valve seat 12 is rotated to align the valve seat 12 with the valve body seat 11, and the valve body seat 11 and the valve seat 12 are fixed by welding such as laser welding.

The above description is only a description of the preferred embodiments of the invention, and it should be noted that the words in the upper, lower, left, right, front, back, inner and outer directions in the description of the present invention are only for clarity of description and should not be regarded as Limitations of the invention. Due to the finiteness of the textual expression, there are infinitely specific structures in the objective, and those skilled in the art can make some improvements and refinements without departing from the principle of the present invention. Retouching should also be considered as the scope of protection of the present invention.

Claims

A valve seat assembly for an electronic expansion valve, comprising:

a valve seat (12) having a valve chamber (121);

a second connector (14) fixedly coupled to a sidewall of the valve seat (12), wherein a first central axis (S1) of the second connector (14) and a second of the valve seat (12) The central axis (S2) is vertically arranged;

Wherein, at any section along the first central axis (S1), the edge face (1431) of the second nozzle (14) does not exceed the inner circumferential surface of the valve cavity (121) (1211) .
A valve seat assembly for an electronic expansion valve according to claim 1, wherein said valve seat (12) includes a base portion (12b) and a bottomed face (12d) integral with said base portion (12b) The bottom portion (12e) has a side hole (12c) formed in the base portion (12b), and the second socket (14) is mated and fixedly connected to the side hole (12c).
A valve seat assembly for an electronic expansion valve according to claim 2, wherein said second joint (14) has a main body portion (141), a small diameter portion (142), and an edge portion (143), said small diameter portion (142) extending into the side hole (12c), the edge face (1431) being located on the inner circumferential surface (1211) of the valve cavity (121).
A valve seat assembly for an electronic expansion valve according to claim 3, wherein said second socket (14) is a straight tube, and said body portion (141) is further provided with positioning pockets (145) for positioning. .
A valve seat assembly for an electronic expansion valve according to claim 3, wherein said second joint (14) is an elbow having a horizontal section (1411) and a mating portion with said side hole (12c) The horizontal section (1411) is a vertically disposed vertical section (1412).
A valve seat assembly for an electronic expansion valve according to claim 4 or 5, wherein said second joint (14) and said valve seat (12) are fixed by press fitting and welding.
A valve seat assembly for an electronic expansion valve according to any one of claims 1 to 5, further comprising: a substantially cylindrical valved port (112) fixed to said valve seat (12) Spool seat (11), wherein

A central axis of the spool seat (11) coincides with a second central axis (S2) of the valve seat (12), and a plurality of communication holes (113) are disposed on a circumferential side wall of the spool seat (11). The communication hole (113) communicates the inner cavity of the valve core seat (11) with the valve cavity (121);

The central axes (S2') of the plurality of communication holes (113) are each located on a first plane (P1) which is higher than the first plane (P1).
A valve seat assembly for an electronic expansion valve according to claim 7, wherein a central axis (S2') of said communication hole (113) and a first central axis (S1) of said second connection pipe (14) The minimum projection angle (α) in the horizontal direction is not less than 20°.
A valve seat assembly for an electronic expansion valve according to claim 8, wherein the number of said communication holes (113) is three, and a central axis (S2') of said communication hole (113) is opposite to said The minimum projection angle (α) of the first central axis (S1) of the two nozzles (14) in the horizontal direction is not less than 45°.
A valve seat assembly for an electronic expansion valve according to claim 8, wherein the number of said communication holes (113) is four, and a central axis (S2') of said communication hole (113) is opposite to said The minimum projection angle (α) of the first central axis (S1) of the two nozzles (14) in the horizontal direction is not less than 30°.
A valve seat assembly for an electronic expansion valve according to claim 8, wherein the number of said communication holes (113) is five or more, and a central axis (S2') of said communication hole (113) is The minimum projection angle (α) of the first central axis (S1) of the second nozzle (14) in the horizontal direction is not less than 25°.
A valve seat assembly for an electronic expansion valve according to claim 7, wherein the number n of said communication holes (113) satisfies a relationship: n·π·d 1 2 /4≥2·π·d 2 2 /4, wherein d 1 is the diameter of the communication hole (113), and d 2 is the diameter of the valve port (112).
A method of manufacturing a valve seat assembly for an electronic expansion valve, comprising the steps of:

S11. Positioning or tightly positioning the valve seat (12) and the valve core seat (11) by laser welding;

S21, press-fit the first nozzle (13) on the third step portion (117) of the valve core seat (11);

S31, pressing the second nozzle (14) into the side hole (12c) of the valve seat (12);

S41, performing welding, so that the valve core seat (11), the valve seat (12), the first connecting tube (13), and the second connecting tube (14) form a valve seat assembly;

The sequence of the foregoing step S11, step S21 and step S31 may be interchanged. Before the step S31 is implemented, the following steps are further included:

S30, the processing edge portion (143) adopts an outer cylindrical surface equal to the inner diameter of the valve chamber (121) or slightly larger than the inner diameter of the valve chamber (121) along a first central axis perpendicular to the second connecting tube (14) The direction of (S1) cuts the end face of the second joint (14), thereby forming an edge portion (143).
The method of manufacturing a valve seat assembly for an electronic expansion valve according to claim 13, wherein the step S31 is specifically:

Using a mechanical positioning or photoelectric positioning, the third central axis (S3) of the side hole (12c) is set at a designated position, and the first central axis (S1) of the second socket (14) and the third central axis ( S3) coincides, and the second nozzle (14) is press-fitted to the valve seat (12).
The method of manufacturing a valve seat assembly for an electronic expansion valve according to claim 14, wherein during the press fitting, the valve seat (12) is further provided with a positioning pin (60), and an outer diameter of the positioning pin (60) It is substantially the same as the inner diameter of the valve chamber (121) of the valve seat (12).
The method of manufacturing a valve seat assembly for an electronic expansion valve according to any one of claims 13 to 15, wherein the step S11 comprises:

S11a adopts photoelectric positioning or mechanical positioning to ensure that the plane formed by the third central axis (S3) of the side hole (12c) of the valve seat (12) and the second central axis (S2) of the valve seat (12) is located at a specified plane. And use the tooling to fix the valve seat (12);

S11b adopts photoelectric positioning or mechanical positioning to ensure that the plane formed by the central axis (S2') of the communication hole (113) of the valve core seat (11) and the central axis of the valve core seat (11) is located on a designated plane. And fixing the valve core seat (11) with a tooling;

S11c, setting the rotation angle β, rotating the positioning tool of the valve core seat (11) or the positioning tool of the valve seat (12), so that the third central axis (S3) and the valve seat (12) of the side hole (12c) The plane formed by the second central axis (S2) is at an angle α to the plane formed by the central axis (S2') of the communication hole (113) and the central axis of the valve core seat (11), so that the steps S11a and S11b are Two tooling together;

S11d, welding is performed, and the valve core seat (11) is fixed to the valve seat (12).
A method of manufacturing an electronic expansion valve seat assembly according to claim 16, wherein the order of said step S11a and step S11b is interchangeable.
The method of manufacturing a valve seat assembly for an electronic expansion valve according to any one of claims 13 to 15, wherein the step S11 comprises:

S11a adopts photoelectric positioning or mechanical positioning to ensure that the plane formed by the third central axis (S3) of the side hole (12c) of the valve seat (12) and the second central axis (S2) of the valve seat (12) is located at a specified plane. And use the tooling to fix the valve seat (12);

S11b', using photoelectric positioning or mechanical positioning, ensuring that the plane formed by the central axis (S2') of the communication hole (113) of the spool seat (11) and the central axis of the valve core seat (11) is located in step S11a The plane formed by the third central axis (S3) and the second central axis (S2) of the valve seat (12) is a plane of angle α, and the valve core seat (11) is fixed by tooling;

S11c', combining the two tooling of step S11a and step S11b;

S11d, welding is performed, and the valve core seat (11) is fixed to the valve seat (12).
The method of manufacturing an electronic expansion valve seat assembly according to claim 16, wherein the position of the side hole (12c) or the communication hole (113) is indicated by a scribe line.
The method of manufacturing an electronic expansion valve seat assembly according to claim 18, wherein the position of the side hole (12c) or the communication hole (113) is indicated by a scribe line.