CN112146312A

CN112146312A - Electronic expansion valve

Info

Publication number: CN112146312A
Application number: CN201911396251.5A
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: 2019-06-28
Filing date: 2019-12-30
Publication date: 2020-12-29

Abstract

The electronic expansion valve is provided with a first valve cavity and a second valve cavity, the two valve cavities 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, the electronic expansion valve is further provided with a convex part, the convex part is arranged opposite to the valve core, at least part of the valve core is positioned in the first valve cavity, and at least part of the convex part is positioned in the second valve cavity.

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. 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.

[ 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 realize the purpose, the following technical scheme is adopted:

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 (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 port part, and the second valve cavity (B) 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 (A) and the second valve cavity (B); the electronic expansion valve is provided with a first interface and a second interface, the first interface is communicated with the first valve cavity (A), and the second interface 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 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 (B); the electronic expansion valve further comprises a convex part, the convex part is located relatively below the valve port part, and the convex part is arranged opposite to the valve core or the convex part is arranged opposite to the valve port.

The first valve cavity and the second valve cavity are arranged on two sides of the valve port of the electronic expansion valve, at least part of the valve core is arranged in the first valve cavity, and the convex part opposite to the valve core is arranged below the valve port or in the second valve cavity, so that when a refrigerant enters the second valve cavity from the first valve cavity through the valve port, the refrigerant can improve the flow mode after throttling when passing through the valve port in the direction through the arrangement of the convex part, the pressure of refrigerant fluid in the middle part is improved, and the noise of the refrigerant electronic expansion valve 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, fragmentary schematic view of the electronic expansion valve of 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;

4-6 are schematic views of the baffle of FIG. 1, FIG. 4 being a cross-sectional view, FIG. 5 being a top view, and FIG. 6 being a perspective view;

fig. 7-9 are schematic partial cross-sectional views of an electronic expansion valve, mainly directed to a valve port structure;

fig. 10 is a schematic structural view of an electronic expansion valve according to a second embodiment;

fig. 11 is a partial schematic view of the electronic expansion valve of fig. 10 including a valve seat and a valve body member; a

FIG. 12 is a schematic view of a partial structure of another embodiment of the electronic expansion valve;

fig. 13 is a partial schematic structural view of an electronic expansion valve according to a third embodiment;

fig. 14 is a schematic structural view of an electronic expansion valve of a fourth embodiment;

FIG. 15 is a partial schematic view of an electronic expansion valve according to yet another embodiment;

fig. 16 is a schematic structural view of an electronic expansion valve according to a fifth embodiment;

fig. 17 is a partial schematic view of another electronic expansion valve.

In the figure: 11. 11a, 11b, 11c, 11 'valve seat, 1110 diverging region, 112', 112a, 112b, 112c, 112d valve port portion, 1121 valve port, 1122 lower wall, 112c1, 11221 first portion, 112c2, 11222 second portion

121 a first connection pipe, 122 a second connection pipe,

130 baffle, 1301 mating part, 1302 convex part, 1303 connecting part, 1304 through hole,

131 screen assembly, 1310 boss, 1311 screen layer, 1312 special-shaped screen layer

132 baffle, 1321 boss, 1322 junction

135 porous sintered part, 1351 protrusions,

14. 14', a valve body member, a protrusion 140, a valve body 141, a side wall portion 1411, a flange portion 1412, a bottom wall portion 1413,

15 connecting piece, 16 sleeve

17 magnetic rotor assembly, 171 magnetic rotor, 172 connecting plate

18 screw mandrel core component,

screw

181, 182 valve core, 183 sleeve part, 184 sleeve cover, 185 fixing part, 186 spring, 187 supporting part,

19 nut assembly, 191 nut, 192 connector

[ 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.

Referring to fig. 1 to 6, 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. 4-6 are schematic views of a flow blocking member in the electronic expansion valve of fig. 1, wherein fig. 4 is a schematic cross-sectional view, fig. 5 is a schematic top view, and fig. 6 is a schematic perspective view.

It should be noted that, the following technical solution is described for a specific electronic expansion valve structure, and the present application mainly improves a flow channel structure for refrigerant flow to improve refrigerant flow noise, specifically, a convex portion is disposed at a position opposite to a valve port. Other components of the electronic expansion valve, such as the magnetic rotor assembly, the screw mandrel assembly, the nut assembly, the stopping device, etc., are not limited herein, and the technical solution of the present application is not particularly limited to the structures 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 solutions 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 component 14, and further comprises a connecting piece 15, a sleeve 16, a magnetic rotor component 17, a screw rod valve core component 18 and a nut component 19, wherein the valve body component 14 comprises a valve body 141, the valve seat 11 and the valve body 141 are fixedly connected through welding, and meanwhile, a first connecting pipe 121 and a second connecting pipe 122 are fixedly connected. 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 being substantially cup-shaped with an open bottom, the bottom of the connecting member having an opening, the connecting member being fixedly connected to the valve seat 11 and to the sleeve 16, i.e., the valve seat is connected to the sleeve via 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.

Magnetic rotor assembly 17 can induce solenoid's electromagnetic force and rotate, magnetic rotor assembly 17 includes magnetic rotor 171 and with magnetic rotor 171 fixed connection or the connecting plate 172 of integrative setting, lead screw case subassembly 18 includes lead screw 181, lead screw 181 and connecting plate 172 fixed connection, so, lead screw 181 is connected into a whole through connecting plate 172 and magnetic rotor assembly 17, specifically, lead screw 181 can adopt welded mode fixed connection or through other fixed connection or spacing connection modes such as joint, crimping with connecting plate 172 to be connected.

The screw rod spool assembly further comprises a spool 182, a sleeve part 183, a sleeve cover 184, a fixing part 185, a spring 186 and a support part 187, the screw rod 181 and the spool 182 are in floating connection through a sleeve, the sleeve comprises the sleeve part 183 and the sleeve cover 184, the sleeve part 183 is in a cup shape with an opening at the bottom, an opening is formed in the bottom of the sleeve part, the spool 182 penetrates through the opening and is limited by the sleeve part 183, at least part of the spool 182 is located in the first valve cavity a, and when the electronic expansion valve works, the spool 182 can move for a certain stroke relative to the valve port under the driving of the spool 182 so as to be matched with the valve port 1121 for. That is, during operation of the electronic expansion valve, the valve body 182 can move up and down within a certain stroke relative to the valve port portion 112 to adjust the opening degree of the valve port 1121, and when the valve body abuts against the valve port portion 112, the valve body 182 can move relative to the sleeve portion 183 against the spring force within a certain range, but does not come off the sleeve. A sleeve cover 184 is arranged on the top of the sleeve part 183, the sleeve part 183 and the sleeve cover 184 are relatively fixed or limited, the sleeve cover 184 is provided with a contact part, the lower end part of the screw rod 181 is fixedly connected with a fixing part 185, the fixing part 185 is provided with a wing part, the wing part faces one side of the valve core, a spring 186 is further arranged and supported by a support part 187, one end of the spring 186 is contacted with the wing part facing one side of the valve core, and the other side is contacted with the support part 187; in the assembling process, the screw 181 penetrates the sleeve cover 184, the fixing member 185 is fixedly connected to the screw 181, and then the screw is assembled with the sleeve 183, and the sleeve cover 184 is assembled with the sleeve 183. In this way, the abutting portion of the sleeve cover 184 is disposed opposite to the wing portion of the fixing member 185, forming a limit structure, and at the same time, the sleeve and the screw shaft 181 are formed into a floating connection structure like a suspension. The sleeve portion 183 and the screw 181 cannot be disengaged from each other, and the valve element can move relative to each other by a predetermined stroke when contacting the valve port portion 112 due to the action of the spring. 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 connecting piece 192 made of metal, 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 the connecting member is not provided, the connecting member 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.

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 cavity a and a second valve cavity B, in this application, a portion of the valve cavity above the valve port 112 and communicated with the first interface 1211 of the first connection pipe 121 is a first valve cavity a, a portion of the valve cavity below the valve seat and communicated with the second interface 1221 of the second connection pipe 122 is a second valve cavity B, the first valve cavity a and the second valve cavity B can be communicated through the valve port 1121, the first valve cavity a is located on a side opposite to the upper side of the valve port 112, the second valve cavity 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 cavity B, and a through diameter H3 of the first interface 1211 is smaller than a through diameter H1. 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 maximum.

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 thickness of the valve port 112 of the present embodiment gradually increases from the position of the valve port 1121 in the radial direction, i.e., the wall thickness h of the valve port 112 at the valve port is the thinnest, and the wall thickness h of the valve port 112 at the valve port is the relatively smallest wall thickness of the valve port, namely, h is the height of the valve port. The wall thickness of the valve port 112 increases gradually radially outward, and the wall thickness H of the valve port 112 at the valve port is smaller than the wall thickness H of the valve port 112 away from the valve port, so that the wall thickness H of the valve port 112 at the valve port can be reduced accordingly, so that the wall thickness H of the valve port 112 at the valve port can be between 0.25mm and 0.45mm, even between 0.25mm and 0.4mm, and the wall thickness of the valve port increases from inside to outside, or the lower wall 1122 of the valve port is substantially horn-shaped, for example, the lower wall 1122 of the valve port 112, and the extension line of the lower wall 1122 in the cross section is substantially an angle α as viewed from the cross section formed through the center, as shown in fig. 2, α is between 100 ° and 140 °, or α is between 110 ° and 130 °. Thus, when the refrigerant flows in the first flow direction, the refrigerant passes through the valve port 1121 and passes through the flared diverging region 1110, so that the refrigerant is favorably diffused to the peripheral side region, the pressure of the refrigerant in the middle is reduced, and the noise caused by the refrigerant flowing in the first flow direction is improved. That is, the channel space of the valve port portion 112 of the electronic expansion valve includes a space formed by the valve port 1121 and the valve element and a space formed by the divergent region 1110 and the valve element, and when the refrigerant flows in the first flow direction, the refrigerant first flows through the valve port 1121, passes through the divergent region 1110, and then enters the second valve chamber B.

The electronic expansion valve of the present embodiment further includes a flow blocking member 130, specifically, the valve body member 14 includes a valve body 141 and the flow blocking member 130, the flow blocking member 130 includes a fitting portion 1301, a convex portion 1302, and a connecting portion 1303, and the flow blocking member 130 has a through hole 1304 through which refrigerant can flow; the matching part 1301 is used for being matched and fixed with the inner wall of the valve body or being limited and mounted, the connecting part 1303 is connected with the convex part 1302 and the matching part, and one or more through holes 1304 are used for the circulation of cooling media. In this embodiment, there are three through holes 1304, correspondingly three connecting portions 1303, and the protrusion 1302 is substantially in the shape of a cap, and the protrusion is a protruding structure and protrudes from a lower portion toward the valve port or the valve body. The convex part can lead most of the refrigerant to flow to the peripheral area of the convex part when the refrigerant flows from the valve opening part to the second valve cavity B, so that the middle part is relatively reduced, and the noise of the refrigerant is improved; that is, the electronic expansion valve has a protrusion disposed in the second valve chamber B, or the electronic expansion valve has a protrusion, the protrusion is at least partially disposed below the valve port, the protrusion 1302 protrudes toward the valve port, or the protrusion 1302 has a protrusion facing the valve core, in this embodiment, a portion O of the protrusion 1302 close to the valve port 1121 is relatively small, a portion M of the protrusion 1302 far from the valve port 1121 is relatively large, a maximum portion M of the protrusion 1302 may be larger than a through diameter D of the valve port, or the protrusion 1302 gradually increases from the portion O relatively close to the valve port 1121 to the portion M far from the valve port 1121. The valve body 141 is further provided with a convex part 140 at the side wall part 1411, the convex part can be a dotted or grooved structure forming an inward groove structure, and limits or fixes the flow blocking member, namely, the flow blocking member is limited or fixed at the side wall part 1411 of the valve body; 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 convex part and the valve core are arranged oppositely, and particularly can be arranged at the opposite position to improve the flowing mode of refrigerant fluid in the middle part and reduce the noise of the refrigerant, and in addition, the convex part can be designed in a streamline shape approximately to reduce the flowing resistance of the refrigerant. When the valve element abuts against the valve port portion, the convex portion is provided at a position where the convex portion does not contact the valve element but can be relatively close to the valve element. The structure of the convex portion is not limited to the structure of the embodiment having a small top and a large bottom, and may be a structure having substantially the same size. The baffle may be formed from a metal material, such as a stainless steel material, by a stamping process, or may be formed from a plastic material by an injection molding process.

The valve body 141 can be made of stainless steel, for example, the valve body is made of stainless steel plate or pipe by drawing, stamping or extrusion; the wall thickness of the valve body is less than 1 mm; the distance L from the bottom wall portion 1413 of the valve body to the valve port portion 121 is more than twice the through diameter H2 of the second interface 1221.

The structure of the valve port portion may be changed, as shown in fig. 7, the valve seat 11a of this embodiment is different from the above embodiments, mainly the structure of the valve port portion 112a, and the lower wall of the valve port portion 112a is in a convex arc shape when viewed from a cross section formed through the center. The lower wall of the valve port portion is also substantially flared, the thickness of the valve port portion 112a also gradually increases from the position of the valve port 1121 radially outward, but the increase is faster as the increase is closer to the middle portion, the wall thickness H of the valve port portion 112a near the valve port is relatively thinnest, and the thickness of the valve port portion 112a radially outward gradually increases, and the wall thickness H of the valve port portion 112a at the valve port is significantly smaller than the wall thickness H of the valve port portion 112a away from the valve port, so that the wall thickness H of the valve port portion 112a at the valve port can be correspondingly reduced, for example, the wall thickness H of the valve port portion 112a at the valve port, for example, H, can be between 0.25mm and 0.45mm, even between 0.25mm and 0.4mm, and the wall thickness of the refrigerant at the valve port portion from the inside to the outside is gradually increased, that is, the refrigerant also has a gradually expanding region 1110 at the peripheral side of the valve port, and can be diffused.

As shown in fig. 8, another valve seat 11b may be adopted in the electronic expansion valve, and accordingly, the lower wall of the valve port 112b is in a concave arc shape when viewed in cross section; or the lower wall of the valve port portion is also substantially flared, the thickness of the valve port portion 112b also gradually increases from the position of the valve port 1121 in a radial direction, the wall thickness H of the valve port portion 112b at the valve port is relatively the thinnest, and the thickness increases gradually in the radial direction, and the wall thickness H of the valve port portion 112b at the valve port is obviously smaller than the wall thickness H of the valve port portion 112b away from the valve port.

In addition, as shown in fig. 9, the lower wall of the valve port 112c may also be a combination of several structures, for example, when viewed from the cross section, the lower wall of the valve port 112c includes a first portion 112c1 and a second portion 112c2, the first portion 112c1 is in an outwardly convex arc shape in the cross section, and the extension line of the cross section of the second portion 112c2 is at an angle, so that the lower wall of the valve port is also in a substantially trumpet shape, the thickness of the valve port 112c also gradually increases from the radial direction of the valve port 1121, the wall thickness H of the valve port 112c at the valve port is relatively thinnest, and the thickness of the valve port 112c gradually increases from the radial direction, and the wall thickness H of the valve port 112c at the valve port is smaller than the wall thickness H of the valve port 112c away from the valve port, that is, the electronic expansion valve port also has a gradually expanding region 1110 at the valve port, and the circumferential. The shape of the valve mouth is only given as an example and is not a limitation to the technical solution.

Next, referring to fig. 10 and 11, another embodiment is described, in which the electronic expansion valve includes a valve seat 11, a valve body 14, a first connection pipe 121, and a second connection pipe 122, the valve body 14 includes a valve body 141 and a flow blocking member 132, and the valve seat 11, the valve body 141, the first connection pipe 121, and the second connection pipe 122 are fixedly connected by welding. Specifically, the valve seat 11 is fixedly connected to the valve body 141 and the first connection pipe 121 by welding, and the valve body 141 is fixedly connected to the second connection pipe 122 by 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 includes a first valve cavity a and a second valve cavity B, the valve cavity above the valve port 112 is defined, a portion of the valve cavity communicating with the first interface 1211 of the first connection pipe 121 is a first valve cavity a, a portion of the valve cavity below the valve port is defined, and a portion of the valve cavity communicating with the second interface 1221 of the second connection pipe 122 is a second valve cavity B, the first valve cavity a and the second valve cavity B can communicate through the valve port 1121, the first valve cavity a is located on a side above the valve port 112, and the second valve cavity B is located on a side below the valve port 112. The diameter D of the valve port 1121 is smaller than the diameter H2 of the second port 1221, the diameter H2 of the second port 1221 is smaller than the diameter H1 of the second valve chamber B, and the diameter H3 of the first port 1211 is smaller than the diameter H1 of the second valve chamber B. The valve core is at least partially located in the first valve chamber a, the flow blocking member 132 is opposite the valve core, and at least a portion of the flow blocking member is located in the second valve chamber B. The flow blocking member may be tubular, such as one produced through drawing, and may be fixed or limited to the bottom wall or side wall of the valve body to reduce weight.

The thickness of the valve port portion 112 is gradually increased from the position of the valve port 1121 radially outward, that is, the wall thickness H of the valve port portion 112 at the valve port is relatively thinnest, and the thickness of the valve port portion 112 at the valve port is gradually increased radially outward, such as gradually increasing, linearly increasing, or stepwise increasing, and the wall thickness H of the valve port portion 112 close to the valve port is smaller than the wall thickness H of the valve port portion 112 away from the valve port, so that the wall thickness H of the valve port portion 112 at the valve port can be correspondingly reduced, the wall thickness H of the valve port portion 112 at the valve port can be between 0.25mm and 0.45mm, even between 0.25mm and 0.4mm, and the wall thickness of the valve port portion from inside to outside is gradually increased or gradually increased. The lower wall 1122 of the valve port of the present embodiment is substantially trumpet-shaped, for example, the lower wall 1122 of the valve port 112, when viewed from a cross section formed through the center, the lower wall 1122 is substantially at an angle α on an extension line of the cross section, for example: alpha is between 100 deg. -140 deg., even alpha is between 110 deg. -130 deg.. Therefore, when the refrigerant flows through the electronic expansion valve in the first flow direction, the refrigerant passes through the valve port 1121 and then passes through the diverging region 1110, that is, the refrigerant can diffuse to both sides. The space of the valve opening 112 includes a valve opening 1121 and a divergent section 1110, and when the refrigerant flows from the first valve chamber a to the second valve chamber B, the refrigerant first passes through the valve opening 1121, then passes through the divergent section 1110, and then enters the second valve chamber B.

The valve body member 14 includes a valve body 141 and a flow blocking member 132, the flow blocking member 132 includes a protrusion 1321 and a connecting portion 1322, and the connecting portion 1322 is used for fixing or limiting with the valve body, and specifically, the connecting portion 1322 is fixed or limiting with a bottom wall portion 1413 of the valve body, such as by welding, for example, spot welding. The protruding portion 1321 of the present embodiment has a substantially tapered shape, and may be formed integrally with the connecting portion or may be formed by separate assembly. The convex part 1321 is arranged or faces the valve core in a protruding mode from the lower direction to the valve port direction, and is of a protruding structure, so that when the refrigerant flows from the valve port to the second valve cavity B, the flowing mode of the refrigerant is changed, the refrigerant is guided to the lateral direction, the interference of the middle part is improved, and the interference noise of the refrigerant of the electronic expansion valve is improved; that is, the electronic expansion valve further includes a protrusion in the second valve chamber B or below the valve port, the protrusion 1321 protrudes toward the valve port, or the protrusion 1321 protrudes toward the valve port and faces the valve element, a portion O of the protrusion 1321 close to the valve port 1121 may be relatively small, a portion M of the protrusion 1321 away from the valve port 1121 may be relatively large and may be larger than the diameter D of the valve port, or the protrusion 1321 may gradually increase from the portion O close to the valve port 1121 to the portion M away from the valve port 1121. The convex part is arranged opposite to the valve core, and can be in a right direction to block the flowing mode of the refrigerant fluid in the middle part, reduce the pressure of the refrigerant at the position and improve the noise of the refrigerant. The convex part can be designed in a substantially streamline shape to reduce the flowing resistance of the refrigerant. The valve body 141 is further provided with an inward flanged portion 1412 at a side wall portion 1411 thereof to be fixedly connected with the second adapter tube 122.

The convex portion in the above embodiment is fixed or limited relative to the valve body, and may be fixed or limited relative to the valve seat, as long as the convex portion is disposed opposite to the valve element, for example, the convex portion may be fixed in a suspended manner relative to the valve seat.

Referring to fig. 12, another embodiment is described, in which the difference between the electronic expansion valve and the above-mentioned embodiment is the structure of the valve port, and the valve port of this embodiment is not provided with a divergent zone. The convex portion 1302 faces the valve port 1121 or faces the valve core 182, when a refrigerant is throttled by the electronic expansion valve in the first flow direction, the refrigerant flows from the valve port 1121 to the peripheral side due to the existence of the convex portion 1302, and if the convex portion 1302 is arranged physically, the refrigerant does not flow through the middle part basically; therefore, the interference phenomenon that the refrigerant on the periphery of the valve core converges towards the middle can be improved, and the flowing noise of the refrigerant is improved.

An alternative embodiment is described below, as shown in fig. 13. 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 body part 14 comprises a valve body 141 and a filter screen assembly 131, and the filter screen assembly 131 is in transition fit or interference fit or small clearance fit with the valve body 141 and is limited by a limiting convex part 140. The filter screen assembly 131 is confined in the second valve chamber and is relatively close to the valve opening 112. Specifically, the filter screen assembly 131 includes a filter screen layer 1311 and a special-shaped filter screen layer 1312, where the filter screen layer 1311 is composed of multiple layers of filter screens, and may be formed by welding or by local welding after crimping, such as a stainless steel filter screen with more than 3 layers, 5 layers, or 7 layers; the special-shaped filter screen layer 1312 is also composed of multiple layers of stainless steel filter screens, and can be formed by local welding and fixing after being pressed, and the filter screens of the special-shaped filter screen layer 1312 comprise more than 3 layers, such as 5 layers and 6 layers. The shaped mesh layer 1312 has a projection 1310 projecting in the valve port direction, and the projection 1310 is provided as a projection facing the valve port 1121 or the valve body 182. In addition, an outer cap can be sleeved on the convex portion 1310 of the special-shaped filter screen layer 1312 to enable the outer cap to face the valve core, the shape of the outer cap can be matched with the convex portion 1310, the outer cap can be fixedly arranged with the filter screen assembly through welding, and the outer cap and the convex portion block the flow of the refrigerant together. In addition, an inner cap with a matched shape can be arranged between the special-shaped filter screen layer 1312 and the filter screen layer 1311, and the inner cap and the convex part block the flow of the refrigerant, so that the ratio of the refrigerant passing through the middle part of the filter screen assembly can be relatively reduced, and the interference in the middle part can be relatively reduced.

Referring to fig. 14, fig. 14 is a schematic view of another embodiment of an electronic expansion valve. The main difference between this embodiment and the first embodiment is that the electronic expansion valve further includes a strainer assembly 131 disposed in the second valve chamber B, the strainer assembly 131 of this embodiment is located relatively below the flow blocking member 132, the flow blocking member 132 is disposed in a transition fit or interference fit with the valve body, the strainer assembly 131 is in a transition fit or interference fit or small clearance fit with the valve body, and is limited by a limiting protrusion 140 disposed on a side wall of the valve body, so that when refrigerant flows into the throttle from the first connecting pipe 121, the refrigerant first passes through the valve port 1121, the gradually expanding port 1110, passes through a through hole of the flow blocking member 132, and then flows through the strainer assembly 131. In addition, the filter screen assembly and the flow blocking member may be combined together and then assembled into the valve body, for example, the filter screen assembly may have a central through hole portion, such that the central through hole portion of the filter screen assembly is sleeved on the protrusion of the flow blocking member, and the filter screen assembly is relatively located above the through hole of the flow blocking member, as shown in fig. 15, a filter assembly is further provided above the through hole of the flow blocking member, and when the refrigerant flows into the throttle from the first connecting pipe 121, the refrigerant first passes through the valve port 1121, the gradually expanding port 1110, passes through the filter screen assembly 131, and then flows through the through hole of the flow blocking member 132.

Another embodiment is described below with reference to fig. 16. The electronic expansion valve is provided with a porous sintered member 135 in the second valve chamber B. The porous sintered member 135 serves as a filter member, and is located relatively below the valve port portion 112. The porous sintered member 135 is substantially cylindrical and is engaged with the inner wall of the sidewall of the second valve chamber, for example, the porous sintered member 135 is engaged with the valve body in a transition fit or clearance fit manner, and is retained or fixed by a retaining protrusion or bump retaining structure or other retaining structure provided on the sidewall of the valve body, or may be retained by the flanged portion 1412 as shown in the figure. Thus, when the refrigerant flows and throttles in the first flow direction, the refrigerant passes through the valve port 1121, the gradually expanding port 1110, the porous sintered member 135, and then flows out of the electronic expansion valve through the second port 1221. The porous sintered piece 135 has protrusions 1351 and a base 1350, the protrusions 1351 and the base 1350 may be integral; the protrusion 1351 is substantially in a shape of a cone or a cap, and is relatively small from a position close to the valve core to a position relatively large from the base, the protrusion 1351 protrudes from the base 1350 toward the valve port, the protrusion 1351 is located below the valve port and is disposed opposite to the valve core, and the protrusion 1351 is substantially in a protruding structure protruding from below toward the valve port, so that when refrigerant flows from the valve port to the second valve chamber B, most of the refrigerant flows toward the peripheral side, the flow rate of the refrigerant flowing from the center is reduced, the flow state of the refrigerant in the second valve chamber is improved, and the noise of the refrigerant can be improved. Additionally, a flow blocking member may be added to the second valve chamber, such as a cap-shaped structure around the protrusion 1351 of the porous sintered member 135.

The electronic expansion valve is provided with two valve cavities on two sides of the valve opening, the second valve cavity is provided with a relatively large space, the second valve cavity or the lower part of the valve opening is provided with a convex part, the convex part is combined in a gradually expanding area of the valve opening, so that when the refrigerant is throttled in the first flow direction, the flow mode of the throttled refrigerant is changed, and the convex part and the valve core are arranged oppositely, so that the confluence of the refrigerant fluid in the middle part can be blocked, and the flow noise of the refrigerant can be effectively improved.

Referring to fig. 17, the embodiment shown in fig. 17 mainly differs from the electronic expansion valve shown in fig. 14 in the valve port structure, as shown in the figure, the electronic expansion valve includes a valve seat 11', a valve body member 14, a first connection pipe 121, and a second connection pipe 122, the valve body member 14 includes a valve body 141, a flow blocking member 130, and a strainer assembly 131, the flow blocking member 130 includes a fitting portion 1301, a protrusion 1302, and a connection portion 1303, in addition, the flow blocking member 130 has a through hole 1304 through which a cooling medium can flow, the flow blocking member 130 and the strainer assembly 131 are located in a second valve cavity B, and the protrusion 1302 is disposed toward the valve port or opposite to the valve core; the maximum position of the protrusion 1302 is larger than the diameter D of the valve port 1121. The valve body 141 can be made of stainless steel, for example, the valve body is made of stainless steel plate or tube by stretching, stamping or extruding, so that the wall thickness of the valve body can be less than 1 mm; the distance L from the bottom wall portion 1413 of the valve body to the valve port portion 121 is more than twice the drift diameter H2 of the second connecting pipe 122. The drift diameter H2 of the second port is larger than the drift diameter D of the valve port, the drift diameter H1 of the second valve cavity B is larger than the drift diameter H2 of the second port communicated with the second connecting pipe, the drift diameter H1 of the second valve cavity B is larger than the drift diameter H3 of the first port communicated with the first connecting pipe, and the drift diameter H2 of the second port communicated with the second connecting pipe is larger than the drift diameter D of the valve port 1121. The strainer assembly 131 of this embodiment is located relatively below the flow blocking member 130, the flow blocking member 130 is in transition fit or interference fit with the valve body, and the strainer assembly 131 is in transition fit or interference fit or small clearance fit with the valve body and is limited by the limiting convex part 140 provided on the side wall part of the valve body. When the refrigerant flows into the throttle from the first connection pipe 121, the refrigerant passes through the valve port 1121, passes through the through hole of the flow blocking member 130, and then flows through the screen assembly 131. In addition, the filter screen component and the flow blocking component can be combined together and then assembled into the valve body, if the filter screen component can be provided with a through hole part in the middle, the through hole part in the middle of the filter screen component is sleeved on the convex part of the flow blocking component, and the filter screen component is relatively positioned above the through hole of the flow blocking component.

The electronic expansion valve is provided with two valve cavities which are respectively positioned at two sides of the valve port part, the first valve cavity and the second valve cavity can be communicated through the valve port, a convex part is arranged on the second valve cavity or below the valve port part, the convex part is arranged in a protruding way towards the valve port direction or arranged opposite to the valve core direction, so that when a 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 flow mode in the middle of the refrigerant is changed by combining the arrangement of the convex part, the convex part is arranged opposite to the valve core or arranged towards the valve port, the confluence of the refrigerant fluid in the middle can be blocked, and. In addition, the maximum position of the convex part is larger than the drift diameter of the valve port, and the flowing noise of the refrigerant is improved. In the second flow direction, the flow noise of the refrigerant can be effectively improved.

The valve body of the embodiment can be formed by processing stainless steel materials through stretching or extruding and the like, for example, the valve body is formed by processing plates or pipes, 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.

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 (112), 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 (1121) at the valve port part, and the valve port (1121) 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 regulate the flow of the electronic expansion valve; (ii) a 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 electronic expansion valve further comprises a convex part, the convex part is located relatively below the valve port part, and the convex part is arranged opposite to the valve core or is arranged towards the valve port.

2. The electronic expansion valve of claim 1, wherein the protrusion is located in the second valve chamber or at least partially in the second valve chamber, and the maximum of the protrusion is larger than the diameter D of the valve port; the convex part and the valve body are fixed or limited; the convex part is relatively close to the valve opening part, and the distance between the flow blocking part and the valve opening part is smaller than the distance between the convex part and the bottom wall part of the valve body.

3. An electronic expansion valve according to claim 1 or 2, wherein the valve body member comprises a flow blocking member, the flow blocking member comprising the protrusion, the flow blocking member being fixed or positioned with respect to the valve body, the protrusion being smaller at a position near the valve port than at a position relatively far from the valve port.

4. The electronic expansion valve according to claim 1 or 2, wherein the valve body member comprises a flow blocking member, the protrusion is disposed on the flow blocking member, the flow blocking member is fixed or positioned with a side wall portion or a bottom wall portion of the valve body, a portion of the protrusion relatively close to the valve port is smaller than a portion of the protrusion relatively far from the valve port, the protrusion comprises a portion, and the portion of the protrusion gradually increases from the portion relatively close to the valve port to the portion far from the valve port; the flow blocking piece is formed by processing a stainless steel material or formed by injection molding of a plastic material.

5. The electronic expansion valve according to claim 1 or 2, wherein the valve body member comprises a flow blocking member, the flow blocking member comprises the protrusion, a connecting portion, a fitting portion, and a through hole, the fitting portion is fitted to an inner wall of a side wall portion of the valve body, the connecting portion connects the fitting portion to the protrusion, the protrusion is located in a middle area in a radial direction of the flow blocking member, the fitting portion is disposed at opposite side portions of the flow blocking member, and the through hole is capable of communicating valve chamber spaces at upper and lower sides of the flow blocking member.

6. The electronic expansion valve according to claim 1 or 2, wherein the valve body member comprises a flow blocking member, the flow blocking member comprising the protrusion, a connecting portion, the flow blocking member being fixed or retained to a bottom wall portion of the valve body by the connecting portion, the protrusion being relatively closer to the valve port portion than the connecting portion; the protrusion may be smaller at a location proximate the valve port than at a location relatively distant from the valve port, or the protrusion may include a portion that gradually increases from a location relatively proximate the valve port to a location distant from the valve port.

7. An electronic expansion valve according to claim 1 or 2, wherein the valve body part comprises a sieve assembly (131), the sieve assembly comprising a profiled sieve layer (1312), the profiled sieve layer comprising a plurality of layers of stainless steel sieves, the profiled sieve layer (1312) comprising a protrusion (1310) arranged towards the valve cartridge or towards the valve port, an outer cap outside the protrusion of the valve body part or an inner cap inside the protrusion, the outer cap or inner cap being shaped to fit the protrusion.

8. An electronic expansion valve according to claim 1 or 2, wherein the valve body member comprises a porous sintered member, the porous sintered member (135) is located below the valve port portion, the porous sintered member is located in the second valve chamber, the porous sintered member (135) comprises a protrusion (1351) and a base (1350), the protrusion protrudes from the base in the direction of the valve port, the protrusion is located below the valve port portion and relatively close to the valve port portion than the base, and the protrusion is located opposite to or towards the valve port.

9. An electronic expansion valve according to any of claims 1-8, further comprising a diverging region (1110) at the valve port, the diverging region being relatively closer to the second valve chamber than the valve port, wherein the wall thickness H of the valve port near the valve port is smaller than the wall thickness H of the valve port relatively far from the valve port; the wall thickness h of the valve opening part close to the valve opening is between 0.25mm and 0.45 mm.

10. An electronic expansion valve according to any of claims 1-8, further comprising a diverging region (1110) at the valve port, the diverging region being relatively closer to the second valve chamber than the valve port, wherein the wall thickness H of the valve port near the valve port is smaller than the wall thickness H of the valve port relatively far from the valve port; the wall thickness h of the valve port part close to the valve port is 0.25mm-0.45 mm; the valve body is made of stainless steel and is formed by stretching, stamping or extruding a stainless steel plate or pipe; the wall thickness of the valve body is less than 1 mm; the distance L from the bottom wall (1413) of the valve body to the valve port is twice or more the diameter H2 of the second connection pipe (122).