CN113566460A

CN113566460A - Electronic expansion valve

Info

Publication number: CN113566460A
Application number: CN202010340941.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-10-29
Also published as: WO2021218804A1

Abstract

The electronic expansion valve comprises a valve seat, a valve body part and a valve core, wherein the valve body part comprises a valve body which is fixedly connected with the valve seat; the valve seat comprises a valve port part, the electronic expansion valve comprises a first valve cavity and a second valve cavity, the first valve cavity is positioned on one side, opposite to the upper side, of the valve port part, and the second valve cavity is positioned on one side, opposite to the lower side, of the valve port part; the electronic expansion valve is provided with a first interface and a second interface, the drift diameter of the valve port is smaller than that of the second interface, and the drift diameter of the second interface is smaller than that of the second valve cavity; the valve port portion comprises a transition portion, a matching portion and a flaring portion, the transition portion is closer to the first valve cavity (A) relative to the matching portion, the flaring portion is closer to the second valve cavity (B) relative to the matching portion, and the height h1 of the matching portion, the height h2 of the flaring portion and the height h3 of the transition portion satisfy the relation: h3 < h1 < h 2; the inner diameter of one end, close to the first valve cavity (A), of the flaring portion is smaller than the inner diameter of one end, close to the second valve cavity (B), of the flaring portion.

Description

Electronic expansion valve

[ technical field ] A method for producing a semiconductor device

The application relates to the technical field of refrigeration control, in particular to an electronic expansion valve.

[ background of the invention ]

The refrigerating system comprises a compressor, a throttling element, two heat exchangers and other parts, wherein the throttling element can adopt an electronic expansion valve and is used for throttling and adjusting a refrigerant, and the electronic expansion valve can realize relatively accurate control so as to improve the energy efficiency of the system. The electronic expansion valve generally includes a first port and a second port, and the refrigerant may flow into the first port and flow out of the second port, or flow into the second port and flow out of the first port. When the refrigerant passes through the electronic expansion valve, a certain noise may be generated. The improvement of the noise of the refrigerant passing through the electronic expansion valve is a technical subject which has been studied by the related technicians of the electronic expansion valve and the refrigeration system for a long time. Those skilled in the art have continuously attempted to improve upon the noise problem of electronic expansion valves.

[ summary of the invention ]

The invention aims to provide an electronic expansion valve which is used for improving the noise problem of a refrigerant flowing through the electronic expansion valve.

In order to achieve the above purpose, one embodiment of the present invention adopts the following technical solutions:

the electronic expansion valve comprises a valve seat, a valve body part and a valve core, wherein the valve body part comprises a valve body which is fixedly connected with the valve seat; the valve seat comprises a valve port part, the electronic expansion valve comprises a first valve cavity and a second valve cavity, the first valve cavity is positioned on one side, opposite to the upper side, of the valve port part, and the second valve cavity is positioned on one side, opposite to the lower side, of the valve port part; the electronic expansion valve is provided with a valve port at the valve port part, and the valve port can be communicated with the first valve cavity and the second valve cavity; the electronic expansion valve is provided with a first interface and a second interface, the first interface is communicated with the first valve cavity, and the second interface is communicated with the second valve cavity; the valve core is at least partially positioned in the first valve cavity, and the valve core is matched with the valve port to regulate the flow of the electronic expansion valve; the drift diameter of the valve port is smaller than that of the second interface, and the drift diameter of the second interface is smaller than that of the second valve cavity; the valve port portion comprises a transition portion, a matching portion and a flaring portion, the transition portion is closer to the first valve cavity (A) relative to the matching portion, the flaring portion is closer to the second valve cavity (B) relative to the matching portion, and the height h1 of the matching portion, the height h2 of the flaring portion and the height h3 of the transition portion satisfy the relation: h3 < h1 < h 2; the inner diameter of one end, close to the first valve cavity (A), of the flaring portion is smaller than the inner diameter of one end, close to the second valve cavity (B), of the flaring portion.

According to the technical scheme, the electronic expansion valve is provided with the two valve cavities which are respectively positioned on two sides of the valve port part, the first valve cavity and the second valve cavity can be communicated through the valve port, so that when the refrigerant is throttled in the first flow direction, the refrigerant flows out of the second valve cavity after being throttled, the second valve cavity has a relatively large space, the valve port part comprises the transition part, the matching part and the flaring part, the flow space of the refrigerant is changed, and the flow noise of the refrigerant is improved.

[ description of the drawings ]

FIG. 1 is a schematic structural diagram of an electronic expansion valve according to a first embodiment of the present disclosure;

FIG. 2 is an enlarged view of a portion I of the electronic expansion valve shown in FIG. 1;

FIG. 3 is a schematic, partially cross-sectional view of the electronic expansion valve of FIG. 1 including a valve seat and valve body components;

FIG. 4 is a schematic cross-sectional view of a valve seat;

FIG. 5 is an enlarged view of section II of FIG. 4;

FIG. 6 is a schematic view of yet another embodiment of a valve seat structure of the present application;

FIG. 7 is a schematic diagram of an electronic expansion valve according to a second embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a valve seat member of the second embodiment;

FIG. 9 is an enlarged view of section III of FIG. 8;

FIG. 10 is a schematic view of another valve seat structure according to an embodiment of the present application

FIG. 11 is a schematic diagram of an electronic expansion valve according to a third embodiment of the present application;

FIG. 12 is an enlarged view of section IV of FIG. 11;

FIG. 13 is a schematic view of a valve seat structure of an electronic expansion valve according to a fourth embodiment;

FIG. 14 is a partial cross-sectional view of yet another valve seat structure embodiment of the present application

FIG. 15 is a partial cross-sectional view of yet another valve seat structure embodiment of the present application.

[ detailed description ] embodiments

In order to make those skilled in the art better understand the technical solutions provided in the present application, the following detailed description of the technical solutions in the present application is made with reference to the accompanying drawings and specific embodiments.

First embodiment

Referring to fig. 1 to 4, fig. 1 is a schematic structural view of a first embodiment of an electronic expansion valve, fig. 2 is a partially enlarged schematic structural view, and fig. 3 is a partially sectional schematic structural view of the electronic expansion valve of fig. 1, which mainly includes a valve seat and a valve body part, so that a structure of a valve port part can be clearly seen; fig. 4 is a schematic cross-sectional view of a valve seat member.

It should be pointed out that the following technical solution is described for a specific electronic expansion valve structure, and this application mainly improves the refrigerant flow noise by improving the flow channel structure of the refrigerant flow, specifically, the structures of the valve cavity and the valve port. Other components of the electronic expansion valve, such as a magnetic rotor assembly, a nut assembly, a stopper, etc., are not limited herein, and the technical solution of the present application is not particularly limited to the structure of the above components, and those skilled in the art can apply the same to all similar electronic expansion valve structures according to the technical solution disclosed herein. The above descriptions of the magnetic rotor assembly, the screw mandrel assembly and other components are only for the convenience of understanding the basic operation principle of the electronic expansion valve, and are not limited in structure.

The electronic expansion valve comprises a valve seat 11 and a valve body part 14, and further comprises a connecting piece 15, a sleeve 16, a magnetic rotor assembly 17, a screw rod valve core assembly 18 and a nut assembly 19, wherein the valve body part 14 comprises a valve body 141, the valve seat 11 and the valve body 141 are fixedly connected through welding, meanwhile, the valve seat 11 is fixedly connected with a first connecting pipe 121, and the valve body part 14 is fixedly connected with a second connecting pipe 122. In the orientation shown in fig. 1, a connecting member 15 is provided on the upper side of the valve seat 11, the connecting member 15 is substantially cup-shaped with an opening at the bottom, and the connecting member 15 is fixedly connected to the valve seat 11 and also fixedly connected to the sleeve 16, that is, the valve seat is connected to the sleeve through the connecting member. Specifically, a step may be provided on the upper side of the valve seat 11, and the bottom opening of the connecting member 15 is fitted with the step, and the two are welded and fixed, or the two are fixed relatively by other forms, such as clamping and then welding.

The upper side of the connecting piece 15 is also provided with a sleeve 16, the sleeve 16 and the connecting piece 15 can be fixed in a welding mode, thus, the sleeve 16, the connecting piece 15 and the valve seat 11 are fixedly connected, and a magnetic rotor assembly 17, a screw mandrel assembly 18 and a nut assembly 19 are arranged in the space among the sleeve 16, the connecting piece 15 and the valve seat 11. It should be noted that, in the above structure, the connecting member 15 is not necessarily present, and when the connecting member 15 is not present, the sleeve 16 may be directly fixedly connected to the valve seat 11, or may be fixed by another means, for example, directly extending the outer edge portion of the valve seat 11 upward and then welding and fixing the sleeve 16.

The magnetic rotor assembly 17 can induce the electromagnetic force of the electromagnetic coil to rotate, the magnetic rotor assembly 17 includes a magnetic rotor 171 and a connecting plate 172 fixedly connected with or integrally provided with the magnetic rotor 171, and the magnetic rotor 171 can be injection molded by using the connecting plate 172 as an insert. The screw mandrel valve core assembly 18 comprises a screw mandrel 181, and the screw mandrel 181 is fixedly connected with a connecting plate 172, so that the screw mandrel 181 is connected with the magnetic rotor assembly 17 through the connecting plate 172 to form a whole, specifically, the screw mandrel 181 and the connecting plate 172 can be fixedly connected in a welding manner or connected in other fixed connection or limiting connection manners such as clamping, crimping and the like. The stop rod 173 is fixedly connected to the magnetic rotor assembly 17 and is located generally in the area generally bounded by the magnetic rotor 171.

The spindle needle assembly 18 includes a spindle 181, a spool 182, a spool housing 183, a spring 184, a washer portion 185, a retainer portion 186, and a sleeve portion 187. The screw 181 and the valve core 182 are in floating connection through the valve core sleeve 183, the valve core sleeve 183 and the valve core 182 can be fixedly connected in a welding mode, the bottom end of the screw 181 is fixedly connected with the shaft sleeve part 187, and the screw 181 and the valve core can be fixedly connected in a welding mode. The valve core 182 is at least partially located in the first valve cavity a (see below), and when the electronic expansion valve works, the valve core 182 can move a certain stroke relative to the valve port under driving so as to cooperate with the valve port 1121 for regulating flow. That is, during operation of the electronic expansion valve, the valve element 182 may move up and down within a certain stroke relative to the valve port 112 to adjust the opening degree of the valve port 1121. A retainer portion 186 and a washer portion 185 are provided on the upper end surface of the valve core sleeve 183, and the retainer portion 186 in this embodiment is not limited to the C-shaped split retainer shown in the drawings, and split retainers of other shapes may be used instead; similarly, the washer 185 in this embodiment is not limited to the circular washer shown in the drawings, and may be replaced by another retainer that can perform the same function, for example, a split retainer. The spring 184 is externally fitted over the screw 181, specifically, one end of the spring 184 abuts against the upper flange 1811 of the screw, the other end of the spring 184 abuts against the washer portion 185, and the washer portion 13 abuts against the lower flange 1812 by the spring 184. It should be noted that one end of the spring 14 abuts against the upper flange 1811, one end of the spring 184 directly abuts against the upper flange 1551, one end of the spring 184 indirectly abuts against the upper flange 1551, and for example, a retainer ring or other members are additionally provided between the spring 184 and the upper flange 1551. The maximum outer diameter of the sleeve part 187 is larger than the minimum inner diameter of the central through hole of the valve core sleeve 183, so that the valve core 182 and the screw rod 181 cannot be separated after the assembly is completed, and the valve core 182 and the screw rod 181 can move relatively in a certain stroke due to the action of the spring 184 when the valve core 182 abuts against the valve port. The disengagement described herein means that the sleeve portion 183 and the lead screw 181 are separated into two separate parts without any limitation to each other, not only that they are not in physical contact.

The nut assembly 19 comprises a nut 191 and a connecting piece 192, the nut 191 is fixedly connected with the connecting piece 192, the connecting piece 192 can be formed by punching a metal plate, the nut 191 is fixedly arranged with the sleeve 16 and/or the connecting piece 15 through the metal connecting piece 192, the nut 191 can be made of non-metal materials and is formed by injection molding by taking the connecting piece 192 as an insert, and the connecting piece 192 and the connecting piece 15 can be fixedly connected in a welding mode. When no connecting member is provided, the connecting piece 192 may be fixedly connected to the valve seat 11 or the sleeve by welding.

The nut 191 has a through hole running through along its axial direction, the nut has an internal thread on the inner side wall where the through hole is provided, and correspondingly, the outer peripheral surface of the screw rod 181 has a corresponding external thread, so that when the magnetic rotor assembly 17 rotates, the screw rod 181 rotates under the action of the thread pair and also moves up and down relative to the nut assembly 19, thereby driving the valve core 182 to move up and down within a certain range.

A spring guide 1911 is disposed at an outer edge portion of a portion of the nut 191, the spring guide 1911 is fixedly or limitedly connected to the nut 191, so that the spring guide 1911 and the nut 191 are positioned relative to each other in both the axial direction and the circumferential direction, the stop rod 173 rotates with the magnetic rotor assembly and drives the slip ring 1912 to spirally slide along the spring guide 1911, the nut assembly is provided with an upper stop portion and a lower stop portion, the slip ring 1912 can abut against the upper stop portion to stop rotating, and the slip ring 1912 can abut against the lower stop portion to stop rotating.

The electronic expansion valve comprises a guide part 20, the guide part 20 is substantially cylindrical, in the embodiment, the periphery of the guide part is provided with a first outer edge part 201 and a second outer edge part 202, wherein the outer diameter of the first outer edge part 201 is smaller than that of the second outer edge part 202, and the outer diameter of the first outer edge part 201 is matched with the inner hole of the lower end part of the nut 191, so that when the electronic expansion valve is assembled, the nut 191 is sleeved on the upper end of the guide part 20, and the first outer edge part 201 can guide the assembly of the nut. The outer diameter of the second outer edge 202 is adapted to the inner diameter of a portion of the inner wall of the valve seat 11, so that guiding can be achieved during assembly, and specifically, the guide portion 20 and the valve seat 11 can be fixedly connected by adopting an interference press-fit mode or a welding mode. Of course, it will be understood by those skilled in the art that the outer diameter of the first outer edge portion 201 is smaller than the outer diameter of the second outer edge portion 202 in the present embodiment, which is determined based on the design that the inner diameter of the inner hole of the valve seat is smaller than the inner diameter of the inner hole of the lower end portion of the nut. The valve core guide part 203 is further disposed inside the guide part 20, and the valve core guide part 203 is matched with the outer diameter of the valve core 182, so that the outer edge surface of the valve core 182 can move along the valve core guide part 203, and thus, when the valve core moves, the valve core guide part 203 can provide good guidance and radial support for the valve core, and abnormal wear of a valve port part caused by the swing of the valve core can be relatively reduced. The first outer edge portion 201, the second outer edge portion 202, and the valve body guide portion 203 are all provided in a certain region or a certain portion provided on the surface of the guide portion 20, and the region or the portion can perform a corresponding guide function, and the shape of the guide portion 20 is not limited. In fact, the guide portion 20 can be variously modified according to the size of the nut, the size and the shape of the valve seat, and the guide portion described in the embodiment of the present invention includes the first outer edge portion 201 capable of guiding the nut, the second outer edge portion 202 capable of guiding the valve seat, and the valve body guide portion 203 capable of guiding the valve body.

The guiding part 20 is at least partially located in the first valve cavity a, and besides guiding the valve core, the lower end part of the guiding part changes the shape of the first valve cavity a, so that a certain influence can be exerted on the fluid flowing into the first valve cavity a, and the noise of fluid flowing can be further reduced.

The electronic expansion valve comprises a valve seat 11, a valve body part 14, a first connecting pipe 121 and a second connecting pipe 122, wherein the valve seat 11, the valve body part 14, the first connecting pipe 121 and the second connecting pipe 122 are fixedly connected through welding, specifically, the valve seat 11 is fixedly connected with the valve body 141 through welding, the valve seat 11 is fixedly connected with the first connecting pipe 121 through welding, and the valve body 141 is fixedly connected with the second connecting pipe 122 through welding. The valve seat 11 has a valve port 112, the valve port 112 is provided with a valve port 1121, the electronic expansion valve has a first valve chamber a and a second valve chamber B, in this application, a portion of the valve chamber above the valve port 112 and in communication with the first interface 1211 of the first connection pipe 121 is a first valve chamber a, a portion of the valve chamber below the valve seat and in communication with the second interface 1221 of the second connection pipe 122 is a second valve chamber B, the first valve chamber a and the second valve chamber B can be communicated through the valve port 1121, the first valve chamber a is located on a side opposite to the upper side of the valve port 112, the second valve chamber B is located on a side opposite to the lower side of the valve port 112, a through diameter D of the valve port 1121 is smaller than a through diameter H2 of the second interface 1221, a through diameter H2 of the second interface 1221 is smaller than a through diameter H1 of the second valve chamber B, and a through diameter H3 of the first interface 1211 is smaller than a through diameter H1 of the second valve chamber B. In this embodiment, the second valve cavity B is not limited to the same size of the through diameter, for example, the through diameters are different, and the through diameter H1 of the second valve cavity B refers to the through diameter at the maximum position. In the present embodiment, the path H1 of the second valve chamber B, the path H3 of the first port 1211, and the path H2 of the second port 1221 satisfy the condition: h1 is more than or equal to 1.3H3, and H1 is more than or equal to 1.3H 2.

The valve body 141 is further provided with an inward flanged portion 1412 at a side wall portion 1411 thereof to facilitate a mating connection with the second adapter tube 122. The valve body 141 may be made of stainless steel, for example, the valve body is made of stainless steel plate or tube by drawing, stamping or extrusion.

In some systems, it may be necessary for the electronic expansion valve to be capable of bidirectional flow, where a flow direction of the refrigerant from the first port to the second port is defined as a first flow direction, a flow direction of the refrigerant from the second port to the first port is defined as a second flow direction, or a flow direction of the refrigerant from the first connection pipe to the second connection pipe through the first valve chamber, the valve port, and the second valve chamber is defined as a first flow direction, and a flow direction of the refrigerant from the second connection pipe to the first connection pipe through the second valve chamber, the valve port, and the first valve chamber is defined as a second flow direction.

The valve port 112 of the present embodiment includes a fitting portion 1123 and a flared portion 1124, and the fitting portion 1123 may be configured to fit with the valve needle and change a flow area of the electronic expansion valve along with the lifting and lowering of the valve needle. The fitting portion 1123 may be a straight section, i.e., the inner diameter of the fitting portion 1123 is kept constant along the central axis direction, which facilitates the processing, and of course, it is also permissible to provide the fitting portion 1123 in a frustum shape with an inner diameter gradually increasing or decreasing from the top to the bottom, but generally at a taper angle of not more than 5 °, i.e., the fitting portion 1123 is closer to a straight section. Wherein, the matching portion 1123 is closer to the first valve cavity a than the flared portion 1124, the flared portion 1124 is located below the matching portion 1123, and the matching portion 1123 and the flared portion 1124 are continuously disposed, as shown in fig. 5, fig. 5 is a cross-sectional view of the valve port 112 of the present embodiment. In the case that the top of the valve port portion is kept flat along the extending direction of the central axis from top to bottom, the thickness of the valve port portion 112 gradually increases from the bottom of the fitting portion 1123 to the outside in the radial direction, i.e., the wall thickness of the valve port portion 112 at the portion of the fitting portion 1123 is relatively thinnest and gradually increases along the downward extending direction of the flared portion 1124. Thus, the inner diameter of the flared portion 1124 adjacent to the first valve chamber a is smaller than the inner diameter of the flared portion 1124 adjacent to the second valve chamber B.

Assuming that the height of the fitting portion 1123 is h1 and the height of the flared portion 1124 is h2, the wall thickness of the valve port 112 at the fitting portion can be understood as the height of the fitting portion 1123 and the wall thickness of the valve port 112 at the flared portion can be understood as the height of the flared portion 1124, so that h1 < h 2. In the present specification, the term "flare" refers to a tendency that the diameter of the valve port portion gradually increases along the central axis direction of the valve port portion with respect to the diameter of the valve port portion. It should be noted that, the gradually increasing trend mentioned herein means that the inner diameter of the valve port portion as a whole is generally larger near the second valve chamber B than near the first valve chamber a, but the inner diameter is allowed to be smaller at a certain section thereof in the top-down direction, for example, a groove facing the inner wall of the valve port portion is provided. h1 can be 0.15-0.45 mm, even 0.25-0.35 mm; the value of h2 may be between 2.5mm and 4.5mm, or even between 3.0mm and 4 mm. The flared portion 1124 is substantially horn-shaped as seen in a longitudinal section shown in fig. 5, and along the longitudinal section passing through the central axis, the inner wall portion of the flared portion 1124 has two contour lines, which are straight lines, the highest point of one of the contour lines is defined as X2, the lowest point of the one contour line is defined as X3, the highest point of the other contour line is defined as Y2, and the lowest point of the other contour line is defined as Y3, and then an angle α is formed between a connecting line of X2 and X3 and a connecting line of Y2 and Y3, and the value of α is 40-80 °. Thus, when the refrigerant flows in the first flow direction, the refrigerant passes through the fitting portion 1123 and passes through the flared enlarged portion 1124, thereby facilitating the refrigerant to diffuse toward the peripheral side region, and improving the noise of the refrigerant flowing in the first flow direction. That is, the channel space of the valve port 112 of the electronic expansion valve includes a space formed by the matching portion 1123 and the valve core and a space formed by the flared portion 1124 and the valve core, and when the refrigerant flows in the first flow direction, the refrigerant flows through the valve port 1121, passes through the flared portion 1124, and then enters the second valve chamber B.

In the present embodiment, the valve port 112 further includes a protrusion 1128 located below the flared portion 1124 and a tail portion 1129 located at the entire bottom of the valve port 112, and the protrusion 1128 protrudes in the direction of the central axis with respect to the frustoconical inner wall of the flared portion 1124. The tail 1129 may be disposed in substantially the same extending direction as the flared portion 1124, in other words, it is understood that the tail 1129 is an extension of the flared portion 1124, and the protrusion 1128 is located on an inner wall of the extended flared portion and protrudes toward the central axis. Of course, in the cross section shown in fig. 2, the tail portion 1129 is not necessarily set to have the same included angle value with the flared portion 1124, and through the test of the applicant, the tail portion 1129 may have an angle of 40 ° to 80 ° in the extension line of the cross section, and still can ensure a good noise control effect.

It should be noted that, when the value of h2 is between 2.5mm and 4.5mm, and the value of α is between 40 ° and 80 °, there is a requirement on the diameter of the valve port 112 (or the diameter of the second valve chamber B can be roughly understood as the diameter), but a common electronic expansion valve in the market is not provided with a second valve chamber, and only a common connecting pipe (the inner diameter usually does not exceed 8mm) is connected to the valve port, and is limited by the inner diameter of the connecting pipe, and the values of h2 and α cannot be satisfied at the same time. In the embodiment, the drift diameter of the second valve cavity H1 roughly limited by the valve body is between 9mm and 30mm, even between 11mm and 14mm, and on the basis, the value of H2 and the value of alpha can be conveniently realized.

The valve port structure provided by the embodiment can reduce noise to a certain extent, and particularly, the noise test result in the first flow direction is relatively better and better than the noise test result in the second flow direction.

As a partial structural modification to the first embodiment, the profile shape of the flared portion 1124 may be modified, and referring to fig. 6, fig. 6 is a schematic view of another valve seat structure of the present application, in this expanded embodiment, the flared portion 1124 no longer has a standard conical shape, and the shape of the flared portion in the longitudinal section thereof is not a straight line. As shown in fig. 12, the flared portion 1124 has two inner wall contours in a longitudinal section passing through the central axis of the valve seat, with the height of the flared portion 1124 being the limit, and the two contours are curved, and fig. 6 is an example of one of the curves, and various curved shapes, or a combination of curved shapes, a combination of curved shapes and straight lines, and the like can be actually adopted. Defining the intersection point of one of the inner wall contour lines and the matching part 1123 as X2 and the lowest point as X3, the intersection point of the other inner wall contour line and the matching part 1123 as Y2 and the lowest point as Y3, and then at least one cross section Q1 exists, wherein the cross section Q1 and the two wheel inner wall contour lines of the flared part 1124 are respectively intersected at two points X1 and Y1, a straight line is obtained by connecting X1 and X2, and another straight line is obtained by connecting Y1 and Y2, the two straight lines have an angle theta, and the angle theta meets the condition: theta 1 is more than or equal to 40 degrees and less than or equal to 80 degrees. The height h4 of X1 to X2 in the vertical direction is equal to: h4 is more than or equal to 2.5 mm. The valve seat having such a structure can satisfy the noise requirement of the electronic expansion valve even when applied to the first embodiment.

Second embodiment

A second embodiment of the present invention will be described with reference to fig. 7 to 10.

Referring to fig. 7-10, fig. 7 is a schematic structural view of an electronic expansion valve according to a second embodiment of the present application; FIG. 8 is a schematic cross-sectional view of a valve seat member of the second embodiment; fig. 9 is an enlarged schematic view of a portion III of fig. 8, and fig. 10 is a partially sectional schematic view of another valve seat member.

In order to facilitate description of the present embodiment, and in particular to embody the difference between the present embodiment and the first embodiment, in the technical solutions, the same reference numerals are used for members having the same structures and functions as those of the first embodiment to briefly describe them, and the difference between the two will be mainly described in detail.

Similar to the first embodiment, the technical scheme of the embodiment is to improve the structures of the valve cavity and the valve port so as to achieve the purpose of improving noise. Other components of the electronic expansion valve, such as a magnetic rotor assembly, a nut assembly, a stopper, etc., are not limited herein, and the technical solution of the present application is not particularly limited to the structure of the above components, and those skilled in the art can apply the same to all similar electronic expansion valve structures according to the technical solution disclosed herein.

The magnetic rotor assembly 17, the screw needle assembly 18, the connecting member 15, the sleeve 16, the valve body member 14, the nut assembly 19, and the guide portion 20 in this embodiment may have the same structure as those in the first embodiment, and will not be described again.

The electronic expansion valve comprises a valve seat 11a, a valve body part 14, a first connecting pipe 121 and a second connecting pipe 122, wherein the valve seat 11a, the valve body part 14, the first connecting pipe 121 and the second connecting pipe 122 are fixedly connected through welding, specifically, the valve seat 11a is fixedly connected with the valve body 141 through welding, the valve seat 11a is fixedly connected with the first connecting pipe 121 through welding, and the valve body 141 is fixedly connected with the second connecting pipe 122 through welding. The valve seat 11a has a valve port 112a, the valve port 112a is provided with a valve port 1121a, the electronic expansion valve has a first valve chamber a and a second valve chamber B, in this application, a portion of the valve chamber above the valve port 112a and communicated with the first interface 1211 of the first connection pipe 121 is a first valve chamber a, a portion of the valve chamber below the valve seat and communicated with the second interface 1221 of the second connection pipe 122 is a second valve chamber B, the first valve chamber a and the second valve chamber B can be communicated through the valve port 1121a, the first valve chamber a is located on a side opposite to the valve port 112a, the second valve chamber B is located on a side opposite to the lower side of the valve port 112a, a through diameter D of the valve port 1121a is smaller than a through diameter H2 of the second interface 1221, a through diameter H2 of the second interface 1221 is smaller than a through diameter H1 of the second valve chamber B, and a through diameter H3 of the first interface 1211 is smaller than a through diameter H1 of the second valve chamber B. In this embodiment, the second valve chamber B is not limited to the same size of the through diameter, for example, the through diameters are different, and the through diameter H1 of the second valve chamber B refers to the through diameter at the relatively largest position.

The valve port 112a of the present embodiment includes a fitting portion 1123a and a flared portion 1124a, and the fitting portion 1123a may be configured to fit with the valve needle and change a flow area of the electronic expansion valve as the valve needle moves up and down. The fitting portion 1123a may be a straight portion, i.e., the inner diameter of the fitting portion 1123a is kept constant along the central axis direction, which facilitates the processing, and of course, it is also permissible to provide the fitting portion 1123a in a frustum shape with an inner diameter gradually increasing or decreasing from the top to the bottom, but generally with a taper angle of not more than 5 °, i.e., the fitting portion 1123 is closer to a straight portion, which will be described below with the fitting portion 1123a being linear. Unlike the first embodiment, a transition portion 1122a is further provided above the fitting portion 1123 a. That is, the transition portion 1122a is located at the opposite top of the valve port portion 112a, the fitting portion 1123a and the flared portion 1124a are sequentially located below the transition portion 1122a, and the valve seat 11a is made of an integral material. As shown in fig. 8, along the extending direction of the central axis from top to bottom, the thickness of the valve port 112a gradually decreases at the transition portion 1122a, remains substantially constant at the fitting portion 1123a, and gradually increases at the flared portion 1124 a. The gradually increasing thickness here means that the thickness of the valve port portion 112a gradually increases radially outward from the bottom of the fitting portion 1123 a. Assuming that the height of the fitting portion 1123a is h1, the height of the flared portion 1124a is h2, and the height of the transition portion 1122a is h3, the thickness of the valve port portion 112a at the transition portion 1122a can be understood as the height of the transition portion 1122a, the thickness of the valve port portion 112a at the fitting portion 1123a can be understood as the height of the fitting portion 1123a, and the thickness of the valve port portion 112a at the flared portion 1124a can be understood as the height of the flared portion 1124 a. And satisfies the condition: h3 < h1 < h 2. The term "flare" as used herein refers to a tendency that the diameter of the valve port portion gradually increases from the bottom of the fitting portion 1123a in the direction of the central axis of the valve port portion with respect to the diameter of the valve port portion. The gradually increasing trend here means that the inner diameter of the valve port portion as a whole is generally larger near the second valve chamber B than near the first valve chamber a, but is allowed to become smaller at a certain section thereof in the top-down direction, for example, a groove facing the inner wall of the valve port portion is provided.

h1 can be 0.15-0.45 mm, even 0.25-0.35 mm; h2 can be 2.5mm-4.5mm, even 3.0mm-4 mm; the value of h3 may be between 0.05mm and 0.2mm, even between 0.05mm and 0.15 mm.

The flared portion 1124a is substantially trumpet-shaped as viewed in a longitudinal section shown in fig. 9, and an inner wall portion of the flared portion 1124a has an angle α at an extension line of the section, the angle α being an acute angle and being between 40 ° and 80 °. The transition portion 1122a is formed by chamfering the valve port portion toward the first valve chamber a, and the transition portion 1122a is disposed adjacent to the first valve chamber a. Since the height of the transition portion 1122a is small, the cross-sectional shape may be linear or curved as viewed in an enlarged view. In the longitudinal section shown in fig. 8, for example, the transition portion is in the form of a linear horn, and the transition portion 1122a is at an angle up to γ in the extension of the section, where γ is at an acute angle and is between 40 ° and 80 °. Thus, when the refrigerant flows in the first flow direction, the refrigerant passes through the transition portion 1122a, the matching portion 1123a and the flared portion 1124a in order, which is advantageous for the refrigerant to diffuse toward the peripheral side region, thereby improving the noise of the refrigerant flowing in the first flow direction. That is, the electronic expansion valve includes a transition portion 1122a, a space formed by the engagement portion 1123a and the valve body, and a space formed by the flared portion 1124 and the valve body in the passage space of the valve port portion 112, and when the refrigerant flows in the first flow direction, the refrigerant sequentially flows through the transition portion 1122a, the engagement portion 1123a, and the flared portion 1124, and then enters the second valve chamber B.

As a local modification of the second embodiment, the transition portion is not limited to a frustum shape, that is, the longitudinal section of the transition portion is not limited to a straight line. Referring to fig. 10, fig. 10 is a partial sectional view of another valve seat structure of the present embodiment, the contour line of the transition portion 1122a1 in the longitudinal section is curved, and since the height h5 of the transition portion is only between 0.05mm and 0.2mm, the straight line of the longitudinal section is changed into an arc-shaped or curved section, which does not affect the technical effect of the present embodiment.

Similar to the first embodiment, when the value of h2 is between 2.5mm and 4.5mm, and the value of α is between 40 ° and 80 °, there is a certain requirement for the diameter of the valve port 112a (or the diameter of the second valve chamber B can be roughly understood), whereas in the electronic expansion valve commonly used in the market, the second valve chamber is not provided, and only a common connecting pipe (the inner diameter usually does not exceed 8mm) is connected to the valve port, which is limited by the inner diameter of the connecting pipe, and the values of h2 and α cannot be satisfied at the same time. In the embodiment, the drift diameter of the second valve cavity H1 roughly limited by the valve body is between 9mm and 30mm, even between 11mm and 14mm, and on the basis, the value of H2 and the value of alpha can be conveniently realized.

The valve port structure provided by the embodiment can reduce noise to a certain extent, and particularly, the noise test result in the second flow direction is relatively better and better than the noise test result in the first flow direction.

Third embodiment

A third embodiment of the present invention will be described with reference to fig. 11 to 12.

Referring to fig. 11 and 12, fig. 11 is a schematic structural view of an electronic expansion valve according to a third embodiment of the present application; fig. 12 is an enlarged view of the portion IV of fig. 11.

The valve seat 11 of the present embodiment also has the same structure as that of the first embodiment, and includes a valve port portion 112 including a fitting portion 1123 and a flared portion 1124. The difference from the first embodiment is that the present embodiment further includes a porous member 21, and at least most of the porous member 21 is located in the first valve chamber a and is in abutment with or fixedly connected to the valve seat. The abutment described herein includes both direct abutment and indirect abutment, and for example, the addition of a gasket between the porous member and the valve seat can be regarded as indirect abutment of the porous member and the valve seat. The porous member 21 is open at both ends and can be formed by sintering metal balls, for example, copper pellets, and the structure can bear a certain pressure without falling, cracking, dispersing and the like. Specifically, during installation, an annular mounting groove 1125 may be formed at the top of the valve port 112 of the valve seat 11 and located outside the valve port, and during installation, the annular bottom of the porous member 21 is aligned with the mounting groove 1125, and then the guide member 20 is installed, so that the guide member 20 abuts against the porous member 21 by setting a predetermined dimensional tolerance, and a certain pressure is applied to the porous member 21, thereby fixing the porous member 21 on the valve seat 11. Of course, the abutment described herein also includes direct abutment or indirect abutment, for example, a spacer is added between the porous member and the guide member, i.e., the porous member and the guide member can be regarded as indirect abutment. Due to the installation groove 1125, the porous member 21 is not easily deviated with respect to the valve seat, thereby making the structure more stable. After flowing into the first valve chamber a from the first connecting pipe, the refrigerant passes through the porous member 21, then enters the valve port, and flows into the second valve chamber B.

As a partial alternative in the present embodiment, instead of providing the annular mounting groove 1125 outside the valve port, the porous member 21 may be directly placed on the top of the valve port, the annular bottom of the cylindrical member 21 may be directly contacted with the top surface of the valve port, and a certain pressure may be applied to the porous member 21 during mounting to deform the porous member 21 to a certain extent, thereby ensuring that the porous member 21 does not loosen in the axial direction after mounting. The porous part 21 can be formed by sintering copper pellets, and the copper pellets have relatively strong binding force and can not disperse or fall off under the condition of certain deformation. Alternatively, the porous member 21 may be formed by sintering a stainless steel wire so long as it has a porous gap through which a refrigerant can pass.

In the above two mounting manners, after the mounting is completed, the axial direction is limited by the height of the porous member 21, the first valve chamber a is partitioned by the porous member 21, the space of the first valve chamber a inside the porous member is communicated with the second valve chamber a through the valve port 1121, the space of the first valve chamber a outside the porous member is directly communicated with the first interface 1211, and the first interface 1211 is communicated with the second interface through the porous member 21, the valve port 1121, and the second valve chamber B.

The porous part 21 is formed by copper balls in a winding mode, a refrigerant can penetrate through gaps formed among the copper balls of the porous part, in order to reduce the phenomenon that the porous part is blocked when impurities are excessive, a through part 211 penetrating through the cylindrical wall part of the porous part 21 can be further arranged on the porous part, and the through part 211 is used for communicating the inner cavity space and the outer cavity space of the porous part, so that the risk that the porous part is blocked by the impurities can be reduced. Fig. 10 is a schematic view of the through part 211, and the through part 211 is a plurality of notches formed at the top end of the porous member, which is advantageous in that it can be directly molded during sintering, and it will be understood by those skilled in the art that the specific structure of the through part is not limited to that shown in fig. 11, as long as the wall of the porous member can be penetrated, such as the through part 211 is formed at the bottom of the porous member, and the through part can be perforated, even the side wall of the porous member, and so on.

The valve port structure provided by the embodiment can reduce noise to a certain extent, and the noise control effects in the first flow direction and the second flow direction are relatively good.

The electronic expansion valve described in the above three embodiments is provided with two valve cavities respectively located at two sides of the valve port portion, the first valve cavity and the second valve cavity can be communicated through the valve port, so that when the refrigerant is throttled in the first flow direction, the refrigerant is throttled and flows out of the second valve cavity, the second valve cavity has a relatively large space, and the flow mode and the flow space of the refrigerant are changed by combining the valve port portion or the combination of the valve port portion and the porous component, thereby improving the flow noise of the refrigerant.

The valve body described in the above embodiments may be formed by drawing or extruding, for example, a plate or a pipe, using a stainless steel material, so that the processing is relatively convenient, and the wall thickness of the valve body is smaller than 1 mm. The diameter of the valve port is not limited to a circle, and the valve port may have a circular cross section. The drift diameter H2 of the second port is greater than the drift diameter D of the valve port 1121, the drift diameter H1 of the second valve chamber B is greater than the drift diameter H2 of the second port communicated with the second connection pipe, the drift diameter H1 of the second valve chamber B is greater than the drift diameter H3 of the first port communicated with the first connection pipe, and the drift diameter H2 of the second port communicated with the second connection pipe is greater than the drift diameter D of the valve port 1121. Here, the diameter corresponds to the equivalent inner diameter, i.e., the value of the inner diameter when the cross-sectional area at that point is changed to a circular shape of the same cross-sectional area, or both have the same cross-sectional area, and thus have the same flow area. The valve body has a bottom wall portion 1413, and the distance L from the bottom wall portion 1413 to the valve port portion is more than twice the through diameter H2 of the second connecting pipe 122, that is, the second valve chamber B has a sufficient height, and can have a certain effect on reducing fluid noise.

In addition, as another specific embodiment, the valve core 182 includes an adjusting portion 1821 and a sharp portion 1822, the adjusting portion 1821 and the sharp portion 1822 are substantially located at the bottom end of the valve core 182, wherein the sharp portion 1822 is located below the adjusting portion 1821. The cross-sectional profile of the adjustment section 1821 is substantially in the shape of a smoothly transitioning curve. When the valve element 182 is in a closed state by abutting against the valve port 112, the outer edge of the adjusting portion 1821 contacts with the valve port 112, when the electronic expansion valve is opened, the screw rod drives the valve element 182 to move upwards, at this time, an annular gap is formed between the outer edge of the adjusting portion 1821 and the valve port 112 for the cooling medium to pass through, and as the valve element 182 gradually moves upwards, because the cross-sectional contour line of the adjusting portion 1821 is a curve with smooth transition, the annular gap changes in size accordingly, and the flow rate is in an approximately equal proportion adjusting state, so as to be different from the linear adjusting state of the frustum-shaped valve element commonly used in the field. The cross-sectional contour line of the adjustment portion may be a combination of a plurality of curves. A spike 1822 of an integrated structure is provided at the bottom of the regulation portion 1821, and the spike 1822 integrally protrudes downward from the bottom of the regulation portion 1821. The sharp portion 1822 changes the shape of the annular gap formed between the valve body 182 and the valve port portion 112, and can fill a part of the refrigerant flow path, thereby reducing the possibility that the refrigerant may have a vortex flow at the bottom of the valve body, and contributing to reducing the noise of the refrigerant flow, compared to a valve body without the sharp portion. It should be noted that the structure of the valve element can be applied to any of the above embodiments, that is, the valve element structure including the adjusting portion and the pointed portion is applied to the valve port portion structure of any of the embodiments, so as to obtain a better noise control effect.

As a further specific implementation manner, on the basis of the three embodiments, the structure of the valve seat member can be further changed, especially the shape of the valve opening portion. Referring to fig. 13, fig. 13 is a schematic view of a valve seat structure of an electronic expansion valve according to a fourth embodiment of the present invention. The present embodiment is an improvement of the first embodiment, and as an integral embodiment, the valve seat member shown in fig. 11 may be replaced with the valve seat member shown in fig. 1 of the first embodiment. In this embodiment, components of the electronic expansion valve other than the valve seat member will not be described in order to avoid redundant description. Meanwhile, the valve seat member according to the present embodiment can be applied to the second embodiment or the third embodiment in its entirety, and those skilled in the art will understand that the valve seat member according to the second embodiment or the third embodiment may be replaced with the valve seat member according to the present embodiment. Therefore, the new technical solution formed by the simple permutation and combination also obviously belongs to the protection scope of the present invention.

As shown in fig. 13, the valve seat 11b of the present embodiment includes a valve port portion 112b, and the valve port portion 112b includes a fitting portion 1121b and a flared portion 1122b, and unlike the first embodiment, the flared portion 1122b extends up to the bottom end of the valve port portion 112 b. As shown in fig. 13, the thickness of the valve port 112b gradually increases in the flared portion 1122b along the direction in which the center axis extends from top to bottom. The gradually increasing thickness here means that the thickness of the valve mouth portion 112b gradually increases radially outward from the bottom of the fitting portion 1121 b. Assuming that the height of the engagement portion 1121b is h1, the height of the flared portion 1122b is h2, the thickness of the valve port 112b at the engagement portion 1121b can be understood as the height of the engagement portion 1121b, and the thickness of the valve port 112b at the flared portion 1122b can be understood as the height of the flared portion 1122 b. And satisfies the condition: h1 < h 2. The term "flare" as used herein means a tendency that the diameter of the valve port portion gradually increases from the bottom of the fitting portion 1122b along the central axis of the valve port portion.

h1 can be 0.15-0.45 mm, even 0.25-0.35 mm; the value of h2 may be between 4.5mm and 6.5mm, even between 5.0mm and 6 mm. In the longitudinal cross section shown in fig. 13, the flared portion 1122b is substantially horn-shaped, and along a longitudinal cross section passing through the central axis of the valve port portion 112b, the inner wall portion of the flared portion 1122b has two contour lines, which are straight lines, an intersection point of one of the inner wall contour lines with the fitting portion is defined as X2, and the lowest point is defined as X3, an intersection point of the other of the inner wall contour lines with the fitting portion is defined as Y2, and the lowest point is defined as Y3, and then an angle α is formed between a connecting line of X2 and X3, and a connecting line of Y2 and Y3, and the value of the angle α satisfies: alpha is more than or equal to 40 degrees and less than or equal to 80 degrees. It should be noted that, when the value of h2 is between 4.5mm and 6.5mm, and the value of α is between 40 ° and 80 °, there is a certain requirement for the diameter of the valve port 112B (or can be roughly understood as the drift diameter of the second valve chamber B), whereas in the electronic expansion valve commonly used in the market, the second valve chamber is not provided, and only a common connecting pipe (the inner diameter usually does not exceed 8mm) is connected to the valve port, which is limited by the inner diameter of the connecting pipe, and the values of h2 and α cannot be satisfied at the same time. In the embodiment, the drift diameter of the second valve cavity H1 roughly limited by the valve body is between 9mm and 30mm, even between 11mm and 14mm, and on the basis, the value of H2 and the value of alpha can be conveniently realized.

Thus, when the refrigerant flows in the first flow direction, the refrigerant sequentially passes through the engaging portion 1121b and passes through the flared diffuser portion 1122b, which is advantageous for diffusing the refrigerant to the peripheral side region, thereby improving noise of the refrigerant flowing in the first flow direction. That is, the electronic expansion valve includes a space formed by the engaging portion 1121B and the valve element and a space formed by the flared portion 1122B and the valve element in the passage space of the valve port portion 112, and when the refrigerant flows in the first flow direction, the refrigerant flows through the engaging portion 1121B and the flared portion 1122B in sequence and then enters the second valve chamber B.

In contrast to the flared portion 1122b of the present embodiment, the mating portions of the first, second, and third embodiments may be understood as the mating portion of the present embodiment, and the flared portions of the first, second, and third embodiments may be understood as a part of the flared portion 1122b of the present embodiment. In the case where the valve port 112b is not provided with the projection, when the valve seat member of the present embodiment is applied to an electronic expansion valve, it is verified through experiments that the noise effect is not deteriorated.

As a partial structural modification to the fourth embodiment, the contour shape of the flared portion 1122b may be changed, and referring to fig. 14, fig. 14 is a schematic view of another valve seat structure of the present application, in this expanded embodiment, the flared portion 1122b no longer has a standard conical shape, and the shape of the flared portion in the longitudinal section thereof is not a straight line. As shown in fig. 14, in the longitudinal section where the contour line of the inner wall of the flared portion 1122b is irregularly curved on the longitudinal and transverse planes passing through the central axis of the illustrated valve seat, the flared portion 1122b has two inner wall contour lines, the intersection point of one of the contour lines with the mating portion is defined as X2, the lowest point is defined as X3, the intersection point of the other contour line with the mating portion is defined as Y2, the lowest point is defined as Y3, and at least one cross section Q1 exists, the cross section Q1 intersects the contour lines of the inner wall of the flared portion 1122b at two intersection points X1 and Y2, a straight line connecting X1 and X2 is obtained, and another straight line connecting Y1 and Y2 is obtained, the two straight lines have an angle θ, and the angle of θ satisfies the condition: theta is more than or equal to 40 degrees and less than or equal to 80 degrees. The height h4 of X1 to X2 in the vertical direction is equal to: h4 is more than or equal to 2.5 mm. The valve seat with such a structure can also meet the requirements of the electronic expansion valve on noise when applied to the first embodiment or the second embodiment, and is not described in detail in terms of space, that is, it is equivalent to add a transition portion to the valve seat of this embodiment. It should be noted that, along the central axis direction of the valve port portion, the diameter of the valve port portion tends to increase gradually, and the increasing trend mentioned herein means that, regarding the inner diameter of the valve port portion as a whole, the inner diameter near the second valve chamber B is generally larger than the inner diameter near the first valve chamber a, but, along the top-down direction, it is allowed that a certain section of the inner diameter is smaller, for example, a groove facing the inner wall of the valve port portion is provided.

Referring to FIG. 15, FIG. 15 is a partial cross-sectional view of another valve seat structure according to an embodiment of the present invention. In this expanded embodiment, the contour line of the inner wall of the flared portion 1122b is a continuous arc-like shape on the longitudinal plane passing through the center axis of the illustrated valve seat, and in this longitudinal section, the flared portion 1122b has two inner wall contour lines, wherein the intersection point of one contour line with the mating portion is defined as X2, the lowest point is defined as X3, the intersection point of the other contour line with the mating portion is defined as Y2, the lowest point is defined as Y3, and at least one cross section Q1 exists, wherein the cross section Q1 intersects the contour line of the inner wall of the flared portion 1122b at two intersection points X1 and Y2, connecting X1 and X2 to obtain one straight line, connecting Y1 and Y2 to obtain another straight line, and the two straight lines have an angle θ, which satisfies the condition: theta is more than or equal to 40 degrees and less than or equal to 80 degrees. The height h4 of X1 to X2 in the vertical direction is equal to: h4 is more than or equal to 2.5 mm. At this time, the connecting line of the inner wall contour lines X2 and X3 of the flared part and the connecting line of Y2 and Y3 have an angle of alpha, and the angle of alpha is larger than 80 degrees when X3 and Y3 are relatively closer to the outer side wall of the valve seat, but because X1 and Y1 exist on the inner wall contour line of the flared part, the angle of theta meets the condition: theta is more than or equal to 40 degrees and less than or equal to 80 degrees, h4 is more than or equal to 2.5mm, and the noise reduction effect is still achieved.

The valve seat with such a structure can also meet the requirements of the electronic expansion valve on noise when applied to the first embodiment or the second embodiment, and is not described in detail in terms of space, that is, it is equivalent to add a transition portion to the valve seat of this embodiment. It should be noted that, along the central axis direction of the valve port portion, the diameter of the valve port portion tends to increase gradually, and the increasing trend mentioned herein means that, regarding the inner diameter of the valve port portion as a whole, the inner diameter near the second valve chamber B is generally larger than the inner diameter near the first valve chamber a, but, along the top-down direction, it is allowed that a certain section of the inner diameter is smaller, for example, a groove facing the inner wall of the valve port portion is provided.

The technical features described in the above embodiments can be mutually arranged and combined on the basis of no conflict, so as to form more embodiments, and the applicant does not list all the arrangement and combination ways any more, and those skilled in the art should understand that these simple combinations obviously belong to the protection scope of the present invention without the creative work.

It should be noted that, the terms of orientation such as up, down, left, right, etc. mentioned herein are used as the reference for the drawings of the specification and are introduced for the convenience of description; and ordinal numbers such as "first", "second", etc. in the names of the components are also introduced for convenience of description, and do not imply any limitation on any order of the components, and since the functions of some parts between the components provided in the above-described embodiments are the same, the present specification adopts a uniform naming manner for these parts. The electronic expansion valve provided in the related art is described in detail above, and specific embodiments are used for illustration, and the description of the embodiments is only for assisting understanding of the method and the core idea of the present invention, and is not intended to limit the present invention in any way.

Claims

1. An electronic expansion valve comprises a valve seat, a valve body part and a valve core, wherein the valve body part comprises a valve body which is fixedly connected with the valve seat; the valve seat comprises a valve opening part, the electronic expansion valve comprises a first valve cavity (A) and a second valve cavity (B), the first valve cavity (A) is positioned on one side, opposite to the upper side, of the valve opening part (112a), and the second valve cavity (B) is positioned on one side, opposite to the lower side, of the valve opening part; the electronic expansion valve is provided with a valve port (1121a) at the valve port part, and the valve port (1121a) can be communicated with the first valve cavity (A) and the second valve cavity (B); the electronic expansion valve is provided with a first interface (1211) and a second interface (1221), wherein the first interface (1211) is communicated with the first valve cavity (A), and the second interface (1221) is communicated with the second valve cavity (B); the valve core is at least partially positioned in the first valve cavity (A), and the valve core is matched with the valve port (1121) to adjust the flow area of the electronic expansion valve; the through diameter of the valve port (1121) is smaller than that of the second interface (1221), and the through diameter of the second interface (1221) is smaller than that of the second valve cavity (B);

the valve port portion comprises a transition portion, a matching portion and a flaring portion, the transition portion is closer to the first valve cavity (A) relative to the matching portion, the flaring portion is closer to the second valve cavity (B) relative to the matching portion, and the height h1 of the matching portion, the height h2 of the flaring portion and the height h3 of the transition portion satisfy the relation: h3 < h1 < h 2; the inner diameter of one end, close to the first valve cavity (A), of the flaring portion is smaller than the inner diameter of one end, close to the second valve cavity (B), of the flaring portion.

2. The electronic expansion valve according to claim 1, wherein the transition portion is formed by chamfering the valve port portion toward the first valve chamber, the transition portion is disposed adjacent to the first valve chamber (a), the transition portion has a linear or curved cross-sectional shape, and a height h3 of the transition portion has a value satisfying: h3 is more than or equal to 0.05mm and less than or equal to 0.2 mm.

3. The electronic expansion valve according to claim 2, wherein the transition portion has a linear shape in a longitudinal section of the valve seat, and has an angle γ that satisfies: gamma is more than or equal to 40 degrees and less than or equal to 80 degrees, and the height h3 of the transition part satisfies the following conditions: h3 is not less than 0.05mm and not more than 0.15 mm.

4. An electronic expansion valve according to any of claims 1-3, wherein the height of the flared portion is defined as being in a longitudinal section passing through the central axis of the valve seat, the flared portion has two inner wall contour lines, the highest point of one of the inner wall contour lines is defined as X2, the highest point of the other inner wall contour line is defined as Y2, the flared portion has at least one cross-section Q1, the cross-section Q1 and the two inner wall contour lines of the flared portion intersect at X1 and Y1, respectively, and then an angle θ is formed between a connecting line of X1 and X2 and a connecting line of Y1 and Y2, and the value of θ satisfies: theta is more than or equal to 40 degrees and less than or equal to 80 degrees, and the value of h1 satisfies the following conditions: h1 is more than or equal to 0.15mm and less than or equal to 0.45mm, and the value of h2 satisfies the following conditions: h2 is more than or equal to 2.5mm and less than or equal to 6.5 mm.

5. The electronic expansion valve according to claim 4, wherein the value of h1 satisfies: h1 is more than or equal to 0.25mm and less than or equal to 0.35mm, and the value of h2 satisfies the following conditions: h2 is more than or equal to 2.5mm and less than or equal to 4.5mm, and the drift diameter H1 of the second valve cavity (B) meets the following requirements: h1 is more than or equal to 9mm and less than or equal to 30 mm.

6. The electronic expansion valve of claim 5, wherein, along a longitudinal section of the valve port portion through the central axis, the inner wall portion of the flared portion has two contour lines, the two contour lines are straight lines, the lowest point of one of the inner wall contour lines is defined as X3, the lowest point of the other inner wall contour line is defined as Y3, and then an angle α is formed between a connecting line of X2 and X3 and a connecting line of Y2 and Y3, and the value of the angle α satisfies: alpha is more than or equal to 40 degrees and less than or equal to 80 degrees.

7. The electronic expansion valve according to claim 4, wherein the valve port portion further comprises a bulge portion (1128) and a tail portion (1129), the bulge portion (1128) bulging towards the central axis direction of the valve port portion, the bulge portion (1128) and the tail portion (1129) being closer to the second valve chamber (B) than the mating portion.

8. An electronic expansion valve according to any of claim 4, wherein the flared portion extends to the bottom end of the valve port portion, the height h1 of the mating portion is less than the height h2 of the flared portion, and the value of h1 is such that: h1 is more than or equal to 0.25mm and less than or equal to 0.35mm, and the value of h2 satisfies the following conditions: h2 is not less than 4.5mm and not more than 6.5mm, and the drift diameter H1 of the second valve cavity (B) meets the following requirements: h1 is more than or equal to 9mm and less than or equal to 30 mm.

9. An electronic expansion valve according to claim 8, wherein the height h2 of the flared portion satisfies: h7 is more than or equal to 5.0mm and less than or equal to 6mm, and the drift diameter H1 of the second valve cavity (B) meets the following requirements: h1 is more than or equal to 11mm and less than or equal to 14mm, along the longitudinal section of the valve port part (112) passing through the central axis, the inner wall part of the flared part is provided with two contour lines, the two contour lines are straight lines, the lowest point of one of the inner wall contour lines is defined as X3, the lowest point of the other inner wall contour line is defined as Y3, an angle alpha is formed between a connecting line of X2 and X3 and a connecting line of Y2 and Y3, and the value of the angle alpha satisfies the following conditions: alpha is more than or equal to 40 degrees and less than or equal to 80 degrees.

10. The electronic expansion valve according to claim 9, wherein the passage H1 of the second valve chamber (B) and the passage H3 of the first port 1211 and the passage H2 of the second port 1221 satisfy the condition: h1 is more than or equal to 1.3H3, and H1 is more than or equal to 1.3H 2.