CN113062990A - Electronic expansion valve - Google Patents

Abstract

The electronic expansion valve comprises a first valve cavity and a second valve cavity which are respectively positioned above and below a valve port, at least part of a valve core is positioned in the first valve cavity, and a filter element is arranged in the second valve cavity, so that when a refrigerant in the electronic expansion valve flows in a first flow direction, the refrigerant flows through the filter element after passing through the valve port, the flow of the refrigerant after passing through the valve port can be improved, the flow noise of the refrigerant is improved, and the requirement of some systems for improving noise is met.

Description

Electronic expansion valve

[ technical field ] A method for producing a semiconductor device

The invention 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 ]

An object of the present application is to provide an electronic expansion valve for improving the noise problem of the 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 above the valve port part, and the second valve cavity B is positioned on one side below the valve port part; the electronic expansion valve is provided with a valve port at the valve port part, and the first valve cavity A can be communicated with the second valve cavity B through the valve port; 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 D 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 electronic expansion valve is also provided with a filter piece below the valve port part, and the filter piece is relatively close to the valve port part.

The first valve cavity and the second valve cavity are arranged on two sides of the valve port of the electronic expansion valve, the filtering piece is arranged in the flow channel between the valve port and the second interface, and the filtering piece is relatively close to the valve port part, so that when the electronic expansion valve is in the first flow direction, the refrigerant throttled by the valve port can pass through the filtering piece, the flow state of the throttled refrigerant in the first flow direction can be improved, and the noise of the refrigerant passing through the electronic expansion valve from the first flow direction 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 illustration in partial cross-sectional view of another embodiment of the electronic expansion valve of FIG. 1;

FIG. 4 is a schematic illustration in partial cross-section of another embodiment of an electronic expansion valve;

FIG. 5 is a schematic cross-sectional view of another embodiment electronic expansion valve;

FIG. 6 is a schematic illustration in partial cross-section of another embodiment of an electronic expansion valve;

fig. 7-9 are schematic views of the baffle of fig. 1, fig. 7 being a cross-sectional view, fig. 8 being a top view, and fig. 9 being a perspective view;

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

FIG. 11 is a schematic cross-sectional view of yet another structure of the second embodiment;

fig. 12 is a partial structural view of an electronic expansion valve including a valve body and a valve seat portion according to still another embodiment;

fig. 13-15 are partial schematic structural views of the electronic expansion valve.

In the figure: 11. 11a, 11b, 11c, 11 'valve seat, 1110 diverging region, 112', 112a, 112b, 112c valve port, 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, 1311 a screen layer,

135. 135', porous sintered part, 1351 protrusions,

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

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.

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 improves the structure of a valve seat and a valve body part. The description of other components of the electronic expansion valve, such as the magnetic rotor assembly, the screw mandrel assembly, the nut assembly, the stopping device, etc., is only for convenience of understanding the basic operating principle of the electronic expansion valve, and is not limited in structure.

Referring to fig. 1 to fig. 3, fig. 1 is a schematic structural view of a first embodiment of an electronic expansion valve, fig. 2 is a partially enlarged schematic view, and fig. 3 is a partially sectional schematic view of the electronic expansion valve of fig. 1, which mainly includes a valve seat and a valve body part.

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, and the valve seat 11 and the valve body 141 are fixedly connected through welding and are fixedly connected with a first connecting pipe 121 and 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 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, a valve port 1121 is disposed at the valve port 112, the electronic expansion valve has a first valve chamber a and a second valve chamber B, in the present application, a valve chamber space above the valve port 112 and a portion communicated with the first interface 1211 of the first connection pipe 121 are referred to as the first valve chamber a, a valve chamber space below the valve port and a portion communicated with the second interface 1221 of the second connection pipe 122 are referred to as the 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 an upper side of the valve port 112, the second valve chamber B is located on a side opposite to a 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. The second valve cavity B is not limited to the same size of the through diameter, and if the through diameters are different, the through diameter H1 of the second valve cavity B refers to the through diameter at the maximum position.

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 outwards, 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 correspondingly reduced, 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 roughly 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 roughly an angle alpha when viewed from the cross section formed through the center, for example, alpha is between 100 degrees and 140 degrees or alpha is between 110 degrees and 130 degrees as shown in FIG. 2. Thus, when the refrigerant flows in the first flow direction, the refrigerant passes through the valve port 1121 and passes through the flared divergent section 1110, that is, the refrigerant can diffuse to both sides, so as to reduce interference of the refrigerant in the middle, thereby improving noise of the refrigerant flowing in the first flow direction. 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 includes a valve seat 11 and a valve body 14, the valve body 14 includes a valve body 141 and a filter element, the filter element of this embodiment includes a filter screen assembly 131, the filter screen assembly 131 is in transition fit or interference fit or small clearance fit with the valve body 141, so that the upper side and the lower side of the filter screen assembly 131 are relatively separated by the filter screen assembly, and the space from the upper side of the filter screen assembly 131 to the lower side of the filter screen assembly 131 is substantially passed through the filter screen assembly 131. The filter screen assembly 131 can be limited by the limiting convex part 140 of the valve body; the filter screen assembly 131 is located in the second valve chamber B and relatively close to the valve mouth portion 112, specifically, the distance L1 between the filter screen assembly 131 and the bottom wall portion 1413 of the valve body is greater than the distance L2 between the filter screen assembly 131 and the valve mouth portion 112, and the distance L2 between the filter screen assembly and the valve mouth portion is not greater than one third of the distance L between the valve mouth portion 112 and the bottom wall portion 1413 of the valve body. The filter screen assembly 131 includes a filter screen layer 1311, and the filter screen layer 1311 is formed by multiple filter screens, and may be formed by welding or by welding and fixing after crimping, for example, formed by 3 or more, 5 or 7 layers of stainless steel filter screens, and the filter screens may be the intended filter screens. The screen assembly 131 may include 1 to 5 screen layers, such as 2 screen layers or 3 screen layers. The screen assembly 131 is over-fit or interference fit or a small clearance fit with the valve body 141. The valve body 141 further has a limiting protrusion 140 at the sidewall 1411 thereof, and the limiting protrusion may be dotted or grooved to form an inward groove structure to limit or fix the strainer assembly, i.e., the strainer assembly is limited or fixed with the sidewall 1411 of the valve body. The convex-concave is relative, convex for the screen assembly and concave from an external perspective. The filter screen component 131 is located below the valve opening portion 112, so that when the refrigerant flows from the first valve chamber a to the second valve chamber B, the refrigerant passes through the filter screen component 131 after passing through the valve opening 1121 and the divergent region 1110 of the valve opening portion, and the flow mode of the refrigerant can be changed by the filter screen component 131, and the filter screen component is combined with the second valve chamber, so that the flow noise of the refrigerant can be relatively reduced by the electronic expansion valve; and the arrangement of the gradually expanding area can more effectively improve the flowing noise of the refrigerant. In addition, the structure of the valve port portion can be changed in many ways, as shown in fig. 3, when the lower wall of the valve port portion 112' is viewed in a cross-sectional view, the lower wall includes a first portion 11221 and a second portion 11222, and the slopes of the two portions are different, that is, the slope angle of the first portion 11221 in the cross-sectional view is different from the slope angle of the second portion 11222 in the cross-sectional view. . The lower wall of the valve port portion is also substantially in a shape of a trumpet, the thickness of the valve port portion 112 ' gradually increases from the portion closest to the valve port 1121 radially outward, the wall thickness H of the valve port portion 112 ' close to the valve port is relatively the thinnest, and the thickness of the valve port portion 112 ' radially outward gradually increases, 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 ' far away from the valve port, that is, the electronic expansion valve also has a divergent region 1110 at the valve port portion, and the refrigerant is diffused in the divergent region 1110 after passing through the valve port 1121, which is beneficial to improving the noise of. 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 the opposite upper side of the valve port 112 ', the second valve cavity B is located on the opposite lower side of the valve port 112', the drift diameter D of the valve port 1121 is smaller than the drift diameter H2 of the second interface 1221, the drift diameter H2 of the second interface 1221 is smaller than the drift diameter H1 of the second valve cavity B, the drift diameter H3 of the first interface 1211 is smaller than the drift diameter H1 of the second valve cavity B, the filter screen assembly 131 is located in the second valve cavity B and is relatively close to the valve port 112, specifically, the distance L1 from the bottom wall 1413 of the valve body is greater than the distance L2 from the filter screen assembly 131 to the valve port 112.

The screen assembly may also be modified, as shown in fig. 4, such that the screen assembly 131 is located in the second valve chamber B relatively close to the valve mouth 112. The filter screen assembly 131 includes a filter screen layer 1311 and a special-shaped filter screen layer 1312, wherein the filter screen layer 1311 is composed of multiple layers of filter screens, and can be formed by welding or formed by local welding and fixing after compression joint, such as more than 3 layers, 5 layers or 7 layers of stainless steel filter screens. The special-shaped filter screen layer 1312 is also composed of multiple layers of stainless steel filter screens, and can be formed by welding and fixing after compression, the filter screens of the special-shaped filter screen layer 1312 comprise more than 3 layers, such as 5 layers and 6 layers, the special-shaped filter screen layer 1312 is provided with a convex part 1310 protruding towards the valve port direction, and the convex part 1310 plays a role in flow blocking or guiding and is arranged towards the valve port 1121 in a protruding mode or is arranged opposite to the valve core. The filter screen assembly 131 is in transition fit or interference fit or small clearance fit with the valve body and is limited by the convex parts or the salient points, so that the filter screen assembly can be installed without other parts. In addition, an outer cap can be sleeved on the convex part 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 part 1310, the outer cap can be fixedly arranged with the filter screen assembly through welding, and the outer cap also serves as a part of the convex part to play a role in blocking or guiding flow. An inner cap may be provided between the profiled mesh layer 1312 and the mesh layer 1311, and the inner cap may cooperate with the protrusion to block the flow. Therefore, the proportion of the refrigerant passing through the middle part of the filter screen assembly can be relatively reduced, and the second valve cavity is combined to improve the flowing noise of the refrigerant. Interference in the middle is relatively reduced. The filter screen component can also comprise two special-shaped filter screen layers, and can also be composed of the special-shaped filter screen layers.

Referring to fig. 5, fig. 5 is a schematic cross-sectional view of another structure of the electronic expansion valve. The main difference with the embodiment shown in fig. 1 is that the electronic expansion valve is further provided with a baffle 130 in the second valve chamber B. The electronic expansion valve includes a valve seat 11, a valve body part 14, a first connection pipe 121, and a second connection pipe 122, and the valve body part 14 includes a valve body 141, a flow blocking member 130, and a screen assembly 131. The flow blocking member 130 comprises a matching part 1301, a convex part 1302 and a connecting part 1303, in addition, the flow blocking member 130 is provided with a through hole 1304 for the circulation of refrigerant, the flow blocking member 130 and the filter screen assembly 131 are positioned in the second valve cavity B, and the flow blocking part 1302 is arranged towards 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 below the flow blocking member 130, the flow blocking member 130 is in transition fit or interference fit with the valve body, 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 protrusion 140 arranged on the 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 the through hole of the flow blocking member 130, and then flows through the strainer assembly 131. In addition, the filter screen assembly and the flow blocking member can be combined together and then assembled into the valve body, for example, the filter screen assembly can be provided with a hole part in the middle part, so that the filter screen assembly is sleeved on the convex part of the flow blocking member through the hole part in the middle part, and the filter screen assembly is relatively positioned above the through hole of the flow blocking member, as shown in fig. 6.

The specific structure of the baffle 130 can be various, and will be described below as an example, with reference to fig. 7-9. 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 a refrigerant can flow. The matching portion 1301 is used for being matched and fixed with the inner wall of the valve body or being installed in a limiting mode, the connecting portion 1303 is connected with the convex portion 1302 and the matching portion, one or more through holes 1304 are formed, and the number of the through holes 1304 is three in the embodiment and used for cooling medium circulation. Correspondingly, there are three connections 1303. The protrusion 1302 is substantially hat-shaped and protrudes toward the valve port or valve body. The convex part can lead the refrigerant to flow to the lateral direction relatively more when flowing from the valve port part to the second valve cavity B, so that the middle part is relatively reduced, the flow mode of the refrigerant in the middle part is improved, for example, confluence and interference are relatively reduced, and the noise of the refrigerant is improved by combining the second valve cavity. That is, the electronic expansion valve has a convex portion in the second valve chamber B, or the electronic expansion valve has a convex portion, the convex portion is at least partially below the valve port, and the convex portion 1302 protrudes toward the valve port, or the convex portion 1302 has a protruding portion facing the valve core. In the present embodiment, the portion O of the protrusion 1302 close to the valve port 1121 is relatively small, and the portion M of the protrusion 1302 far from the valve port 1121 is relatively large, and the maximum portion M of the protrusion 1302 may be larger than the diameter D of the valve port, or the protrusion 1302 gradually increases from the portion O close to the valve port 1121 to the portion M far from the valve port 1121. The valve body 141 further has a limiting protrusion 140 at the sidewall 1411, and the limiting protrusion may be a dotted or notched inward groove structure to limit or fix the flow blocking member, i.e., the flow blocking member is limited or fixed to the sidewall 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 is arranged opposite to the valve core or faces the valve port, and particularly can be arranged at the opposite part to improve the flowing mode of refrigerant fluid in the middle part so as to reduce the noise of the refrigerant. In addition, the convex part can be designed in a substantially streamline shape so as 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. In addition, the flow blocking member may be a tubular structure, such as a tubular member formed by drawing, and fixed or limited to the bottom wall portion or the side wall portion of the valve body by other components.

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 twice or more the diameter H2 of the second port 1221, so that the second valve chamber has a certain space.

Next, a second embodiment is described, and referring to fig. 10 and 11, fig. 10 and 11 are schematic structural views of two electronic expansion valves according to the second embodiment. The electronic expansion valve is provided with a porous sintered part 135' in the second valve chamber B. As a filter, a porous sintered member 135' is located relatively below the valve mouth portion 112. The porous sintered member 135 'is substantially cylindrical and fits against the inner wall of the sidewall portion of the second valve chamber, such as by the transition fit or small clearance fit of the porous sintered member 135' with the valve body and is retained by the retaining protrusion or nub provided on the sidewall portion of the valve body, or may be retained by the bead 1412 as shown. Thus, when the refrigerant flows into the first connection pipe 121 and throttles, the refrigerant passes through the valve port 1121, the divergent opening 1110, passes through the porous sintered member 135', and then flows out of the electronic expansion valve through the second connection 1221. In addition, a flow blocking member can be arranged in the second valve cavity in a matching mode. The porous sintered piece is relatively close to the valve mouth portion 112, the distance L2 of the porous sintered piece from the valve mouth portion 112 is not more than one third of the distance L of the valve mouth portion 112 from the bottom wall portion 1413 of the valve body: l2 is not more than 1/3 xL.

In addition, the structure of the porous sintered member may also be changed, not limited to the above cylindrical shape, the porous sintered member 135 has the protrusions 1351 and the base 1350, and the protrusions 1351 and the base 1350 may be integrated; the protrusions 1351 are substantially conical or cap-shaped or cylindrical or truncated cone-shaped. If the protrusion 1351 is tapered, it is relatively small near the valve core and relatively large at the base. The protrusion 1351 protrudes from the base 1350 toward the valve port, the protrusion 1351 is located below the valve port and faces the valve element or toward the valve port, and the protrusion 1351 is substantially a protruding structure protruding from below toward the valve port, so that when the refrigerant flows from the valve port to the second valve chamber B, most of the refrigerant flows laterally, and the flow rate of the refrigerant flowing through the middle is reduced.

Referring to fig. 12, another embodiment is described, in which a valve seat 11 'is not provided with a diverging area, the electronic expansion valve includes the valve seat 11', a valve body part 14, a first connection pipe 121, and a second connection pipe 122, the valve body part 14 includes a valve body 141, a flow blocking member 130, and a filter screen assembly 131, the flow blocking member 130 includes a fitting portion 1301, a protrusion 1302, and a connection portion 1303, the flow blocking member 130 further includes a through hole 1304 through which a cooling medium can flow, the flow blocking member 130 and the filter screen assembly 131 are located in a second valve cavity B, and the protrusion 1302 is disposed toward a valve port or an opposite valve core; the maximum position of the protrusion 1302 is larger than the diameter D of the valve port 1121. The screen assembly 131 is located in the second valve chamber B and relatively close to the valve port 112, and specifically, the distance L1 between the screen assembly 131 and the bottom wall 1413 of the valve body is greater than the distance L2 between the screen assembly 131 and the valve port 112. 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 inner wall of the second valve cavity of the valve body and is limited by the limiting convex part 140 arranged on the side wall part of the valve body. When the refrigerant flows into the throttle from the first connection pipe 121, the refrigerant first 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 strainer assembly and the flow blocking member may be combined together and then assembled into the valve body, for example, the strainer assembly may have a central through hole portion, such that the central through hole portion of the strainer assembly is sleeved on the protrusion of the flow blocking member, and the strainer assembly is relatively located above the through hole of the flow blocking member, as shown in fig. 13-15.

The structure of the valve port portion of the above embodiment may be modified in some ways, as in the embodiment shown in fig. 13 to 15. The valve seat 11a of the embodiment shown in fig. 13 is different from the above-mentioned embodiments, and mainly has the structure of the valve port 112a, in which the lower wall of the valve port 112a is in the shape of an arc protruding outward in a cross section formed through the center, the lower wall of the valve port is substantially in the shape of a trumpet, and the thickness of the valve port 112a gradually increases from the position of the valve port 1121 in the radial direction outward, but the thickness increases more rapidly as the thickness increases closer to the middle, that is, the thickness increases less and less from the middle to the outside. The wall thickness H of the valve port portion 112a near the valve port is relatively thinnest, and gradually increases radially outward, and the wall thickness H of the valve port portion 112a at the valve port is smaller than the wall thickness H of the valve port portion 112a far from the valve port. Thus, the wall thickness h of the valve port 112a at the valve port can be reduced accordingly, for example, the wall thickness h of the valve port 112a at the valve port can be between 0.25mm and 0.45mm, or between 0.25mm and 0.4mm, and the wall thickness of the valve port gradually increases from inside to outside, that is, the electronic expansion valve also has a divergent region 1110 at the valve port, and the refrigerant can diffuse to the peripheral region after passing through the valve port 1121, which can be beneficial to improving the noise of the refrigerant.

As shown in fig. 14, the electronic expansion valve may also adopt another valve seat 11b structure, accordingly, the lower wall of the valve port 112b is in a concave arc shape when viewed from the cross section, or the lower wall of the valve port is also in a substantially trumpet shape, the thickness of the valve port 112b gradually increases from the position of the valve port 1121 in a radial direction, the wall thickness H of the valve port 112b at the valve port is relatively the thinnest, and the wall thickness H of the valve port 112b at the radial direction gradually increases, and the wall thickness H of the valve port 112b at the valve port is obviously smaller than the wall thickness H of the valve port 112b away from the valve port.

In addition, the lower wall portion of the valve port portion may have a combination of several structures, such as a combination of different slopes when viewed in cross section, a combination of an arc and a diagonal line, and the like. As shown in fig. 15, the lower wall of the valve port 112c includes a first portion 112c1 and a second portion 112c2 when viewed in cross section, the first portion 112c1 has an outwardly convex arc shape in cross section, and the extension line of the second portion 112c2 in cross section has an angle, so that the lower wall of the valve port is also substantially flared, and the thickness of the valve port 112c gradually increases from the position of the valve port 1121 in a radial direction. The wall thickness H of the valve port 112c at the valve port is the thinnest, and the wall thickness H of the valve port 112c at the valve port is gradually increased radially outward, 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 also has a gradually expanding region 1110 at the valve port, and the refrigerant can diffuse to the peripheral region after passing through the valve port 1121, which is beneficial to improving the noise of the refrigerant. The shape of the valve mouth is only given as an example and is not a limitation to the technical solution.

The application provides an electronic expansion valve, two valve chambeies through setting up, be located the first valve chamber of valve port portion top and the second valve chamber of below, filter through setting up at the second valve chamber, after the refrigerant is through the valve port throttle, the refrigerant after the throttle filters the piece, can change the flow mode of refrigerant, reduce the interference of refrigerant relatively, and improve refrigerant flow noise, make the noise of refrigerant through electronic expansion valve can reduce, thereby improve the problem that this long-term existence of electronic expansion valve noise, this is obviously different with original conventional thinking, even will set up and filter originally, also set up the position of keeping away from the valve port portion relatively such as takeover, and this application makes filter the piece and is close to the valve port portion relatively, the flow noise of refrigerant has been improved on the contrary. 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.

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, in the present embodiment, the terms of orientation such as up, down, left, right, etc. are used as references in the drawings of the specification and are introduced for 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 (10)

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 first valve cavity (A) can be communicated with the second valve cavity (B) through the valve port (1121); 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; the through diameter (D) 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 is also provided with a filter piece below the valve port part, and the filter piece is relatively close to the valve port part.

2. The electronic expansion valve of claim 1, wherein the filter element being relatively close to the valve port comprises: the distance (L1) of the filter element from the bottom wall (1413) of the valve body is greater than the distance (L2) of the filter element from the valve mouth (L2) and the distance (L) of the filter element from the valve mouth is not greater than one third of the distance (L) of the valve mouth from the bottom wall (1413) of the valve body.

3. An electronic expansion valve according to claim 1 or 2, wherein the filter element comprises a sieve assembly (131) located in the second valve chamber or at least partly located in the second valve chamber; said screen assembly comprises at least two screen layers (1311), said screen layers comprise at least three stainless steel screen layers or said screen assembly comprises at least ten stainless steel screen layers or said screen assembly comprises at least three screen layers (1311), said screen layers comprise at least five stainless steel screen layers; the valve body component comprises the filter screen assembly, and the filter screen assembly is in transition fit or interference fit or small clearance fit with the inner wall of the side wall part of the valve body; the filter screen layer is fixed by crimping or welding or crimping and welding.

4. An electronic expansion valve according to any of claims 1-3, wherein the filter element comprises a sieve assembly (131), the valve body part comprises the sieve assembly, the sieve assembly comprises a profiled sieve layer (1312) located in the second valve chamber or at least partly in the second valve chamber; the special-shaped filter screen layer comprises a plurality of layers of stainless steel filter screens, the special-shaped filter screen layer (1312) comprises a convex part (1310), the convex part protrudes towards the valve port direction and is arranged opposite to the valve core, and the special-shaped filter screen layer is in transition fit or interference fit or small clearance fit with the inner wall of the side wall part of the valve body; and the special-shaped filter screen layer is fixed by compression joint or welding or compression joint and welding.

5. An electronic expansion valve according to claim 1 or 2, wherein the filter element comprises a porous sintered part, the porous sintered part (135, 135') being located below the valve mouth portion, the porous sintered part being located at least partly in the second valve chamber, the porous sintered part being relatively close to the valve mouth portion (112), the distance (L2) of the porous sintered part from the valve mouth portion (112) being not more than one third of the distance (L) of the valve mouth portion (112) from the bottom wall portion (1413) of the valve body.

6. An electronic expansion valve according to claim 1 or 2, wherein the filter element comprises a porous sintered member, the porous sintered member (135) being located below the valve port portion, the porous sintered member being located in the second valve chamber, the porous sintered member (135) comprising a protrusion (1351) and a base (1350), the protrusion protruding from the base in the direction of the valve port, the protrusion being located below the valve port portion and being arranged opposite or towards the valve poppet, the porous sintered member being located relatively close to the valve port portion (112) than the base, the distance (L2) of the porous sintered member from the valve port portion (112) being not more than one third of the distance (L) of the valve port portion (112) from the bottom wall portion (1413) of the valve body.

7. An electronic expansion valve according to claim 5 or 6, wherein the valve body part comprises the porous sintered part, the cross-sectional shape of which at least partly fits the second valve chamber, the distance (L2) of the porous sintered part from the valve mouth part being smaller than the distance (L1) of the porous sintered part from the bottom wall part (1413) of the valve body.

8. An electronic expansion valve according to any of claims 1-7, comprising a first connection pipe (121) provided with the first interface (1211) and a second connection pipe (122) provided with the second interface (1221); the valve seat (11) further comprises a peripheral wall part, the first connecting pipe (121) and the valve seat (11) are fixedly connected at the peripheral wall part of the valve seat through welding, and the first interface (1211) is directly communicated with the first valve cavity (A); the valve body comprises a flanging part (1412), the second connecting pipe (122) is fixedly connected with the valve body at the flanging part through welding, and the second interface (1221) is communicated with the second valve cavity (B).

9. An electronic expansion valve according to any of the preceding claims, further comprising a diverging section (1110) at the valve port, said diverging section being larger near the second valve chamber than said diverging section near the valve port; the divergent zone is relatively closer to the second valve chamber than the valve port, the valve port is positioned between the divergent zone and the first valve chamber, and the divergent zone is positioned between the valve port and the second valve chamber; the wall thickness H of the valve opening part close to the valve opening is smaller than the wall thickness H of the valve opening part relatively far away from the valve opening, and the wall thickness H of the valve opening part of the electronic expansion valve 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, wherein the electronic expansion valve is further provided with a diverging region (1110) at the valve port, the diverging region being substantially trumpet-shaped, the diverging region being larger near the second valve chamber than the diverging region near the valve port; the valve port is positioned between the divergent zone and the first valve chamber, and the divergent zone is positioned between the valve port and the second valve chamber; the divergent zone is relatively closer to the second valve cavity than the valve port, and the wall thickness H of the valve port part close to the valve port is smaller than the wall thickness H of the valve port part relatively far away from the valve port; the wall thickness h of the valve opening part of the electronic expansion valve close to the valve opening is between 0.25mm and 0.45 mm; the valve opening portion gradually increases from a portion O relatively close to the valve port 1121 to a portion M far away from the valve port 1121; the valve port part comprises a part, the lower wall of the valve port part forms an angle alpha on an extension line of a cross section formed by the center, and the angle alpha satisfies the following conditions: alpha is more than or equal to 100 degrees and less than or equal to 140 degrees or alpha is more than or equal to 110 degrees and less than or equal to 130 degrees; 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).

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