Electronic expansion valve

Abstract

The application discloses an electronic expansion valve, which comprises a valve body part and a valve needle, the valve body part is provided with a valve cavity and a valve port part in communication with the valve cavity; the valve body part comprises a seat sleeve part arranged in the valve cavity, the seat sleeve part divides the valve cavity into a first cavity part and a second cavity part, the first cavity part is arranged around the second cavity part, a sleeve cavity of the seat sleeve part forms the second cavity part, and the valve port part can be in communication with the second cavity part; the valve body part is further provided with a first interface in communication with the first cavity part, a center line of the first interface is perpendicular to an axis of the seat sleeve part, and an upper end surface of the seat sleeve part is not lower than the center line of the first interface; the valve needle is in plug-in cooperation with the seat sleeve part and can move along the axis direction of the seat sleeve part to adjust the opening degree of the valve port part, and a flow channel in communication with the first cavity part and the second cavity part is formed between the valve needle and the seat sleeve part. The structural design of the electronic expansion valve can relieve the impact of the refrigerant flowing into the valve cavity on the valve needle, prevent the valve needle from shaking, and improve the stability and reliability of product work.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid control technology, in particular to an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve generally comprises a coil, a valve body component, a rotor, a nut, a screw rod and a valve needle, etc. The valve body component has a valve cavity, a first interface and a second interface which are communicated with the valve cavity, and the first interface and the second interface are communicated through a valve port part. The rotor rotates under the driving action of the coil, moves up and down under the threaded transmission action of the nut fixed on the valve body component by means of the screw rod connected on the rotor, and drives the valve needle to move up and down together, so as to adjust the opening of the valve port part, i.e. to adjust the flow of the refrigerant between the first interface and the second interface.

[0003] During work, the valve needle is subjected to the pressure of the inflow refrigerant of the transverse connecting pipe, and the situation of easy shaking exists, thereby affecting the adjustment of the refrigerant flow. Meanwhile, the flow noise of the refrigerant is relatively obvious during use. SUMMARY

[0004] The purpose of the present application is to provide an electronic expansion valve, the structural design of which can relieve the impact of the inflow refrigerant of the valve cavity on the valve needle, relatively improve the shaking phenomenon of the valve needle, and improve the stability and reliability of the product work.

[0005] In order to solve the above technical problems, the present application provides an electronic expansion valve, comprising a valve body component and a valve needle, wherein the valve body component has a valve cavity and a valve port part communicated with the valve cavity; the valve body component comprises a seat sleeve part arranged in the valve cavity, the seat sleeve part separates the valve cavity into a first cavity part and a second cavity part, the first cavity part is arranged around the second cavity part, a sleeve cavity of the seat sleeve part forms the second cavity part, and the valve port part can be communicated with the second cavity part; the valve body component further has a first interface communicated with the first cavity part, the center line of the first interface is perpendicular to the axis of the seat sleeve part, and the upper end surface of the seat sleeve part is not lower than the center line of the first interface; the valve needle is inserted and assembled with the seat sleeve part, and can move along the axis direction of the seat sleeve part to adjust the opening of the valve port part, and a flow passage communicated with the first cavity part and the second cavity part is formed between the valve needle and the seat sleeve part.

[0006] The electronic expansion valve provided by the application is provided with a seat sleeve part in the valve cavity of the valve body part, the seat sleeve part separates the valve cavity to form a second cavity part and a first cavity part surrounding the second cavity part, wherein the sleeve cavity of the seat sleeve part is the second cavity part, the valve needle is inserted and matched with the seat sleeve part and can move along the axial direction of the seat sleeve part to open and close the valve port part, the first interface of the valve body part is communicated with the first cavity part, and the upper end surface of the seat sleeve part is not lower than the center line of the first interface, so that the refrigerant flows into the first cavity part from the first interface, and the refrigerant directly impacts the seat sleeve part due to the design of the seat sleeve part, the impact of the refrigerant on the valve needle can be greatly relieved, the movement of the valve needle is guided by the seat sleeve part, the shaking phenomenon of the valve needle can be improved under the interaction, and the noise caused by the shaking of the valve needle is eliminated.

[0007] The electronic expansion valve as described above, the flow-through area of the flow-through passage is greater than the flow-through area of the valve port part.

[0008] The electronic expansion valve as described above, the valve needle comprises a first needle part and a second needle part, the second needle part is fixedly connected below the first needle part and directly matched with the valve port part, the first needle part is slidably matched with the seat sleeve part, the radial dimension of the second needle part is smaller than the radial dimension of the sleeve cavity, so that a flow-through cavity is formed between the outer peripheral wall of the second needle part and the inner wall of the seat sleeve part, a flow channel is formed between the first needle part and the seat sleeve part, and the flow-through passage comprises the flow channel and the flow-through cavity.

[0009] The electronic expansion valve as described above, the first needle part is in a columnar structure as a whole, the outer peripheral wall of the first needle part has at least one axial extension surface part, the flow channel comprises the region formed between the axial extension surface part and the inner wall of the seat sleeve part, and / or the inner peripheral wall of the seat sleeve part has at least one axial extension groove, and the flow channel comprises the region formed between the groove and the outer peripheral wall of the first needle part.

[0010] Alternatively, at least two protruding rib strips are arranged on the first needle part along the circumferential direction of the first needle part, the protruding rib strips extend along the axial direction of the first needle part, the first needle part is slidably matched with the seat sleeve part through the protruding rib strips, and the wall part of the first needle part between the adjacent two protruding rib strips and the inner wall of the seat sleeve part form the flow channel.

[0011] The electronic expansion valve as described above, the upper end of the inner wall of the seat sleeve part has an inclined wall section, and the radial distance between the inclined wall section and the first needle part gradually decreases from top to bottom.

[0012] The electronic expansion valve as described above further comprises a nut part, the lower end of the nut part is fixedly connected with the valve body part, the lower end of the nut part has a guide hole part facing the seat sleeve part, the valve needle is slidably matched with the guide hole part, and the guide hole part is coincident with the axis of the sleeve cavity.

[0013] The electronic expansion valve as described above, the valve body component comprises a valve sleeve and a valve seat, the valve seat is fixedly arranged in the valve sleeve, the valve seat comprises a seat base and a seat sleeve part, the seat sleeve part is fixedly connected with the seat base or integrated with the seat base, the valve seat is fixedly connected with the valve sleeve through the seat base, the seat base is provided with the valve port; the valve sleeve is a tubular part with open ends.

[0014] The electronic expansion valve as described above, the valve seat divides the lumen of the valve sleeve into an upper cavity and a lower cavity, the valve cavity is formed in the upper cavity, the valve port is communicated with the lower cavity; further comprising a flow straightening part, the flow straightening part is arranged below the seat base and abuts against the seat base; the flow straightening part is provided with a through hole communicated with the valve port, the through hole comprises a variable-diameter hole section and a constant-diameter hole section, the variable-diameter hole section is arranged close to the valve port relative to the constant-diameter hole section, the hole diameter of the variable-diameter hole section gradually decreases from top to bottom.

[0015] The minimum diameter D1 of the valve port, the hole diameter D2 of the constant-diameter hole section and the maximum hole diameter D3 of the variable-diameter hole section satisfy the following conditions: D2=D1±20%, D3>1.5D2.

[0016] The electronic expansion valve as described above, the variable-diameter hole section is in a conical shape, and the conical angle is greater than 90°.

[0017] The electronic expansion valve as described above, further comprising a sound-absorbing part, the sound-absorbing part is arranged in the sleeve cavity, and / or the sound-absorbing part is wrapped on the outer wall of the seat sleeve part.

[0018] The electronic expansion valve as described above, the seat sleeve part is provided with a planar wall part towards the outer peripheral wall of the first interface.

[0019] The electronic expansion valve as described above, the upper end surface of the seat sleeve part is not lower than the upper edge of the first interface, and the area of the planar wall part is comparable to the area of the first interface. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The cross-sectional schematic view of the first embodiment of the electronic expansion valve provided by the present application;

[0021] Figure 2 The cross-sectional schematic view of the first embodiment of the electronic expansion valve provided by the present application; Figure 1 The partial schematic view of the cooperation between the valve body component, the valve needle and the nut component;

[0022] Figure 3 The cross-sectional schematic view of the partial structure of the electronic expansion valve in the second embodiment provided by the present application;

[0023] Figure 4 The cross-sectional schematic view of the partial structure of the electronic expansion valve in the second embodiment provided by the present application; Figure 3Structure diagram of middle valve seat cooperating with rectifier;

[0024] Figure 5 Sectional view of partial structure of electronic expansion valve in third embodiment of the present application;

[0025] Figure 6 Structure diagram of a specific embodiment of valve needle of electronic expansion valve;

[0026] Figure 7 Structure diagram of Figure 6 Valve needle shown in the figure;

[0027] Figure 8 Structure diagram of another specific embodiment of valve needle of electronic expansion valve;

[0028] Figure 9 Structure diagram of Figure 8 Valve needle shown in the figure.

[0029] Explanation of reference numerals:

[0030] Valve seat component 100, valve sleeve 110, first interface 111, second interface 112, valve seat 120, seat base 121, seat sleeve 122, inclined wall section 1221, valve port 130, valve port 131, flared portion 132, cover 140;

[0031] Valve cavity 100a, first cavity 101a, second cavity 102a;

[0032] Valve needle 200, first needle portion 210, section portion 211, convex rib 212, second needle portion 220, nut component 300, seat portion 310, guide hole portion 311, threaded portion 320;

[0033] Lead screw 400, rotor 500, housing 600;

[0034] Silencer 700, first connecting pipe 810, second connecting pipe 820;

[0035] Rectifier 900, through hole 910, variable-diameter hole section 911, constant-diameter hole section 912. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0037] Please refer to Figure 1 and Figure 2 , Figure 1 Sectional view of first embodiment of electronic expansion valve provided by the present application; Figure 2 Structure diagram of Figure 1A partial view of the cooperation between the valve body component, the valve needle and the nut component.

[0038] In this embodiment, the electronic expansion valve comprises a valve body component 100 and a valve needle 200, the valve body component 200 has a valve cavity 100a and a valve port 130 communicating with the valve cavity 100a.

[0039] The valve body component 100 comprises a seat sleeve 122 arranged in the valve cavity 100a, which separates the valve cavity 100a into a first cavity 101a and a second cavity 102a, the first cavity 101a is arranged around the second cavity 102a, the sleeve cavity of the seat sleeve 122 forms the second cavity 102a, and the valve port 130 specifically communicates with the second cavity 102a.

[0040] The valve body component 100 also has a first interface 111 communicating with the first cavity 101a and a second interface 112 communicating with the valve port 130, the center line of the first interface 111 is perpendicular to the axis of the seat sleeve 122, and the upper end surface of the seat sleeve 122 is not lower than the center line s1 of the first interface 111. Generally, the first interface 111 is connected with a first connecting pipe 810, and the second interface 112 is connected with a second connecting pipe 820 to facilitate connection with the system pipeline.

[0041] The valve needle 200 is inserted and fitted with the seat sleeve 122 and can move along the axis direction of the seat sleeve 122 to adjust the opening degree of the valve port 130. A flow passage communicating the first cavity 101a and the second cavity 102a is formed between the valve needle 200 and the seat sleeve 122. It can be understood that the axis direction of the seat sleeve 122 is the axis direction of the valve body component 100, that is, the up-down direction in the figure.

[0042] After the above arrangement, the refrigerant flows into the valve cavity 100a from the first interface 111, directly enters the first cavity 101a, flows into the second cavity 102a from the first cavity 101a through the flow passage, and can flow out of the second interface 112 through the valve port 130 when the valve needle 200 opens the valve port 130.

[0043] As can be seen from the above, when the electronic expansion valve works, the refrigerant flows into the first cavity 101a from the first interface 111, and due to the design of the seat sleeve 122, the seat sleeve 122 separates the valve needle 200 inserted therein and the refrigerant, and the refrigerant basically directly impacts the seat sleeve 122, which can greatly alleviate the impact of the refrigerant on the valve needle 200. At the same time, the seat sleeve 122 also guides the movement of the valve needle 200, and under the interaction, the valve needle 200 can be prevented from shaking, and the noise caused by the shaking of the valve needle 200 can be eliminated.

[0044] In actual arrangement, in order to avoid the impact of refrigerant on the valve needle 200, the upper end surface of the seat sleeve part 122 is preferably arranged not lower than the upper edge of the first interface 111, and in the shown scheme, the upper end surface of the seat sleeve part 122 is higher than the upper edge of the first interface 111.

[0045] In a specific scheme, the seat sleeve part 122 has a planar wall part towards the outer peripheral wall of the first interface 111, so that after the refrigerant flows into the first interface 111, it directly contacts the planar wall part, the contact area of the refrigerant and the seat sleeve part 122 is increased, the impact force of the refrigerant on the seat sleeve part 122 is alleviated, the impact force is not concentrated at a position, and the bubbles in the refrigerant are quickly eliminated, the larger bubbles are broken, and the effect of sound elimination is achieved.

[0046] More specifically, the area of the planar wall part of the seat sleeve part 122 towards the first interface 111 is equivalent to the area of the first interface 111, so as to improve the sound elimination effect.

[0047] In a specific arrangement, the flow area of the flow passage between the valve needle 200 and the seat sleeve part 122 is greater than the flow area of the valve port part 130, so that the flow regulation depends on the opening degree of the valve port part 130, and the control of the refrigerant flow is facilitated.

[0048] In this embodiment, the valve body part 100 is fixedly connected with a housing 600, the housing 600 is provided with a rotor 500, the rotor 500 is fixedly connected with a lead screw 400, the lower end of the lead screw 400 is fixedly connected with the valve needle 200, and the lead screw 400 is threadedly connected with a nut part 300 fixedly connected with the valve body part 100. The lead screw 400 has external threads, and the nut part 300 has internal threads.

[0049] After the coil (not shown in the figure) is energized, the rotor 500 can be driven to rotate, the lead screw 400 rotates accordingly, and through the threaded transmission action of the lead screw 400 and the nut part 300, the valve needle 200 is driven to move up and down, so as to realize the opening and closing of the valve port part 130.

[0050] In a specific scheme, the nut part 300 includes a seat part 310 and a threaded part 320, the threaded part 320 has internal threads, the nut part 300 is fixedly connected with the valve body part 100 through the seat part 310, the radial dimension of the seat part 310 is greater than that of the threaded part 320, the lead screw 400 passes through the nut part 300 and is threadedly connected with the threaded part 320.

[0051] The seat part 310 of the nut part 300 is provided with a guide hole part 311 towards the seat sleeve part 122, and the valve needle 200 is in sliding clearance fit with the guide hole part 311. It can be understood that the upper part of the valve needle 200 is in sliding clearance fit with the guide hole part 311, and the lower part is in plug-in fit with the seat sleeve part 122, and is guided by the seat sleeve part 122 and the guide hole part 311. Obviously, the axis of the guide hole part 311 coincides with the sleeve cavity of the seat sleeve part 122.

[0052] In this way, the stability and reliability of the action of the valve needle 200 can be further improved, and the probability of shaking of the valve needle 200 during action can be reduced due to the restriction of the upper and lower guide structures.

[0053] In this embodiment, the valve body component 100 includes a valve sleeve 110 and a valve seat 120, the valve seat 120 is fixedly arranged in the interior of the valve sleeve 110, the valve seat 120 includes a seat base 121 and the aforementioned seat sleeve part 122, the seat base 121 and the seat sleeve part 122 can be integrally processed and formed, or can be separately processed and then fixedly connected together through welding or the like, and in practice, in order to ensure the reliability of the product and the convenience of processing, the valve seat 120 is preferably an integral structure.

[0054] Specifically, the valve sleeve 110 is a tubular member with open ends, in this way, the valve sleeve 110 can be stretch-formed, and is a tubular member with a relatively thin wall thickness, which is convenient for processing and can save materials.

[0055] The above structure of the valve sleeve 110 also facilitates the assembly of various components.

[0056] The valve seat 120 is specifically fixedly connected with the valve sleeve 110 through the seat base 121, the radial dimension of the seat base 121 is equivalent to the inner diameter of the valve sleeve 110, and the two are sealingly connected, the radial dimension of the seat sleeve part 122 is smaller than that of the seat base 121, and the aforementioned valve port part 130 is specifically arranged on the seat base 121.

[0057] As shown in Figure 2 In this embodiment, the valve port part 130 specifically includes a valve port 131 and a flared part 132 in communication, the flared part 132 is located below the valve port 131, and the valve port 131 is the smallest flow area of the valve port part 130, in this way, when the valve port part 130 is in an open state, the refrigerant flows out of the valve port 131 of the valve port part 130, and then flows to the second interface 112 after transition at the flared part 132, thereby avoiding noise caused by sudden change in flow area.

[0058] As shown in Figure 1 As arranged above, it can be understood that the seat base 121 of the valve seat 120 divides the lumen of the valve sleeve 110 into an upper cavity and a lower cavity, and the valve cavity 100a is formed in the upper cavity.

[0059] Specifically, the seat part 310 of the aforementioned nut component 300 is sealingly connected with the upper end of the valve sleeve 110, in this way, the seat part 310 of the nut component 300, the seat base 121 of the valve seat 120, and the wall part of the valve sleeve 110 between the two enclose to form the valve cavity 100a, and the seat sleeve part 122 of the valve seat 120 divides the valve cavity 100a into the aforementioned second cavity part 102a and the first cavity part 101a surrounding the second cavity part 102a.

[0060] On this basis, the first interface 111 is formed on the wall of the valve sleeve 110 between the seat base 121 and the seat part 310, as shown in Figure 1 and Figure 2 .

[0061] Obviously, the seat part 310 of the nut part 300 and the upper end of the seat sleeve part 122 have a preset distance, so as to facilitate the flow of refrigerant between the first cavity part 101a and the second cavity part 102a.

[0062] In this embodiment, the valve body part 100 further comprises a cover 140 for sealing the lower end opening of the valve sleeve 110, and the second interface 112 is formed on the wall of the valve sleeve 110 below the valve seat 120, as shown in Figure 1 It can be understood that in actual installation, the second interface 112 can also not be formed on the wall of the valve sleeve 110, and the lower end opening of the valve sleeve 110 can directly form the second interface.

[0063] In this embodiment, the valve needle 200 comprises a first needle part 210 and a second needle part 220, the second needle part 220 is fixedly connected below the first needle part 210 and is used for directly cooperating with the valve port part 130, the first needle part 210 is in sliding clearance fit with the seat sleeve part 122, and the radial dimension of the second needle part 220 is smaller than the radial dimension of the sleeve cavity, that is, the second cavity part 102a. In this way, a flow passage is formed between the inner wall of the second needle part 220 and the seat sleeve part 122, and a flow channel is formed between the first needle part 210 and the seat sleeve part 122. In this way, the flow passage connecting the first cavity part 101a and the second cavity part 102a comprises the flow channel and the flow passage.

[0064] Generally, the valve needle 200 and the sleeve cavity of the seat sleeve part 122 are generally circular in structure, facilitating the processing and cooperation of the parts, and the first needle part 210 is generally cylindrical in structure; there are various ways to form the flow channel between the first needle part 210 and the seat sleeve part 122, which will be described in detail below.

[0065] Please refer to Figure 6 and Figure 7 , Figure 6 for the structure diagram of a specific embodiment of the valve needle of the electronic expansion valve; Figure 7 is Figure 6 the bottom view of the valve needle shown in

[0066] Specifically, at least one section part 211 extending in the axial direction is arranged on the outer peripheral wall of the first needle part 210 of the valve needle 200. After the first needle part 210 is assembled with the seat sleeve part 122, a flow area is formed between the section part 211 and the inner peripheral wall of the seat sleeve part 122, and the aforementioned flow channel comprises the flow area.

[0067] It should be noted here that the section part 211 can be understood as a face part formed by removing a part of the material in the axial direction on the cylindrical structure.

[0068] For the convenience of processing and operation, the cutaway portion 211 is specifically a rectangular planar structure. It can be understood that the shape of the cutaway portion 211 is not limited thereto in actual arrangement, as long as the cutaway portion 211 can be formed on the peripheral wall of the first needle portion 210 to have a set distance from the inner peripheral wall of the seat sleeve portion 122 to form a flow passage connecting the first cavity portion 101a and the aforementioned flow-through cavity between the outer peripheral wall of the first needle portion 210 and the inner peripheral wall of the seat sleeve portion 122.

[0069] In the illustrated scheme, two cutaway portions 211 are specifically formed on the peripheral wall of the first needle portion 210 of the valve needle 200, and the two cutaway portions 211 are symmetrically arranged along the circumference of the first needle portion 210, so that the uniformity of the refrigerant flow is better, and the force received by the valve needle 200 is also more uniform.

[0070] In actual arrangement, the specific number, shape and arrangement form of the cutaway portion 211 of the peripheral wall of the first needle portion 210 are not limited, and other forms can be used.

[0071] In addition to the above-mentioned manner, in order to form the aforementioned flow passage, the structure of the first needle portion 210 of the valve needle 200 can also be other forms, such as Figure 8 and Figure 9 as shown in Figure 8 the structure diagram of another specific embodiment of the valve needle of an electronic expansion valve; Figure 9 as shown in Figure 8 the bottom view of the valve needle.

[0072] In this scheme, the main body of the first needle portion 210 of the valve needle 200 is in a cylindrical structure, at least two protruding rib strips 212 are arranged along the circumference of the first needle portion 210, the protruding rib strips 212 extend along the axial direction of the first needle portion 210, and the first needle portion 210 is specifically in sliding clearance fit with the seat sleeve portion 122 through the protruding rib strips 212, that is, the protruding rib strips 212 directly contact the seat sleeve portion 122. In this way, after assembly, the wall portion of the first needle portion 210 located between the adjacent two protruding rib strips 212 has a predetermined distance from the inner wall of the seat sleeve portion 122, and a region formed between the two forms a flow passage connecting the first cavity portion 101a and the flow-through cavity.

[0073] In the illustrated scheme, the first needle portion 210 of the valve needle 200 specifically has three protruding rib strips 212 arranged along the circumference thereof, and the three protruding rib strips 212 are uniformly arranged along the circumference of the first needle portion 210. Such arrangement is also conducive to the uniformity of the refrigerant flow and the uniformity of the force received by the valve needle 200.

[0074] In actual arrangement, the specific shape, number and arrangement of the protruding rib strips 212 can be set according to requirements.

[0075] The formation of the above two flow channels mainly relies on setting corresponding structures on the first needle portion 210 of the valve needle 200. In addition, a groove extending axially can also be set on the inner peripheral wall of the seat sleeve portion 122. The area formed between the groove and the outer peripheral wall of the first needle portion 210 forms the flow channel.

[0076] In actual configuration, the above-mentioned structures for forming the flow channel can be combined with each other, which will not be described in detail here.

[0077] like Figure 2 As shown, in this embodiment, the upper end of the inner wall of the seat sleeve portion 122 has an inclined wall section 1221. From top to bottom, the radial distance between the inclined wall section 1221 and the first needle portion 210 gradually decreases, that is, the upper end of the sleeve cavity of the seat sleeve portion 122 is designed to be open, which is more conducive to the flow of refrigerant.

[0078] Specifically, to facilitate processing, this portion can be set to a tapered structure.

[0079] Please refer to Figure 3 , Figure 3 It is a cross-sectional schematic diagram of the local structure of the electronic expansion valve in the second embodiment provided by the present invention.

[0080] The structure of the electronic expansion valve in this embodiment is basically the same as that of the first embodiment, and only the differences between the two are described below.

[0081] In this embodiment, the electronic expansion valve also includes a rectifying component 900, which is located below the seat base 121 of the valve seat 120 and is against the seat base 121. The rectifying component 900 has a through hole 910 connected to the valve mouth portion 130. The through hole 910 includes a variable diameter hole section 911 and a constant diameter hole section 912. The variable diameter hole section 911 is arranged close to the valve mouth portion 130 relative to the constant diameter hole section 912, that is, the variable diameter hole section is located above the constant diameter hole section 912, wherein the aperture of the variable diameter hole section 911 gradually decreases from top to bottom.

[0082] In specific configuration, the rectifying member 900 may be fixedly connected only to the valve sleeve 110 , or only to the seat base 121 of the valve seat 120 , or to both the valve sleeve 110 and the seat base 121 .

[0083] The arrangement of the rectifying member 900 can adjust the flow rate of the refrigerant flowing through the valve port 130 , thereby preventing the flow rate from suddenly changing and generating noise when the flow area of ​​the refrigerant increases sharply.

[0084] Please refer to Figure 4 , Figure 4 for Figure 3 Schematic diagram of the structure of the middle valve seat and the rectifier.

[0085] To optimize the adjustment of the refrigerant flow rate, the relevant parameters of the through hole 910 of the flow regulating member 900 are set as follows:

[0086] D2=D1±20%, D3>1.5D2;

[0087] wherein D1 is the minimum diameter of the valve port portion 130, in this case, it is the diameter of the valve port of the valve port portion 130, D2 is the diameter of the constant-diameter hole section 912 of the through hole 910, and D3 is the maximum diameter D3 of the variable-diameter hole section 911 of the through hole 910.

[0088] The variable-diameter hole section 911 is provided so that there is a transition space for refrigerant flow between the flow regulating member 900 and the valve port portion 130, which is conducive to the adjustment of the refrigerant flow rate.

[0089] In a specific scheme, the variable-diameter hole section 911 is provided as a conical hole structure, and the conical angle is greater than 90°.

[0090] In this embodiment, a sound-absorbing member 700 is further provided in the sleeve cavity of the seat sleeve portion 122. Specifically, as shown in Figure 3 , the sound-absorbing member 700 is provided in the flow-through cavity formed between the second needle portion 220 of the valve needle 200 and the seat sleeve portion 122. It can be understood that the provision of the sound-absorbing member 700 should not affect the flow-through between the first cavity portion 101a, the second cavity portion 102a, and the valve port portion 130.

[0091] The provision of the sound-absorbing member 700 can further eliminate noise during refrigerant flow.

[0092] Please refer to Figure 5 , Figure 5 for a cross-sectional view of the partial structure of the electronic expansion valve provided in the third embodiment of the present application.

[0093] The basic structure of this embodiment is basically the same as that of the aforementioned first embodiment, and only the differences between the two will be described below.

[0094] By comparison Figure 5 and Figure 1 , it can be seen that, compared with the aforementioned first embodiment, the present embodiment is additionally provided with a sound-absorbing member 700. In this embodiment, the sound-absorbing member 700 is specifically wrapped around the outer wall of the seat sleeve portion 122, which can relieve the noise generated when the refrigerant impacts the seat sleeve portion 122 after flowing in.

[0095] It can be understood that in actual settings, the flow regulating member 900 of the aforementioned second embodiment can also be provided in this embodiment, or the sound-absorbing member of the aforementioned second embodiment can also be provided in the sleeve cavity of the seat sleeve portion 122.

[0096] The electronic expansion valve provided by the present application is described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method of the present application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electronic expansion valve comprising a valve body and a valve needle, wherein the valve body has a valve cavity and a valve port communicating with the valve cavity; characterized in that: The valve body component includes a seat sleeve portion provided in the valve cavity, the seat sleeve portion divides the valve cavity into a first cavity portion and a second cavity portion, the first cavity portion is substantially arranged around the second cavity portion, the sleeve cavity of the seat sleeve portion forms the second cavity portion, and the valve port portion is capable of communicating with the second cavity portion; the valve body component further includes a first interface communicating with the first cavity portion, the center line of the first interface being perpendicular to the axis of the seat sleeve portion, and the upper end surface of the seat sleeve portion is not lower than the center line of the first interface; the valve needle is plug-fitted into the seat sleeve portion and can be moved along the axial direction of the seat sleeve portion to adjust the opening of the valve port portion, and a flow channel connecting the first cavity portion and the second cavity is formed between the valve needle and the seat sleeve portion; The valve body component includes a seat base portion, the seat base portion is fixedly connected to or integrally formed with the seat sleeve portion, and the valve port portion is defined in the seat base portion; the electronic expansion valve further includes a rectifying member, the rectifying member is located below the seat base portion and abuts against the seat base portion; the rectifying member has a through hole communicating with the valve port portion, the through hole including a variable diameter hole section and a constant diameter hole section, the variable diameter hole section being arranged closer to the valve port portion relative to the constant diameter hole section, and the hole diameter of the variable diameter hole section gradually decreases from top to bottom; The minimum diameter D1 of the valve port, the diameter D2 of the constant diameter hole section, and the maximum diameter D3 of the variable diameter hole section satisfy the following conditions: D2=D1±20%, D3>1.5D2.

2. The electronic expansion valve according to claim 1, characterized in that: A flow area of ​​the flow channel is larger than a flow area of ​​the valve port.

3. The electronic expansion valve according to claim 1, characterized in that: The valve needle includes a first needle portion and a second needle portion, the second needle portion is fixedly connected to the bottom of the first needle portion and is used to directly cooperate with the valve mouth portion; the first needle portion and the seat sleeve portion are fitted with a sliding clearance, and the radial dimension of the second needle portion is smaller than the radial dimension of the sleeve cavity, so as to form a flow cavity between the outer peripheral wall of the second needle portion and the inner wall of the seat sleeve portion, and a flow channel is formed between the first needle portion and the seat sleeve portion, and the flow channel includes the flow channel and the flow cavity.

4. The electronic expansion valve according to claim 3, characterized in that: The first needle portion is generally cylindrical in structure, and its outer peripheral wall has at least one cut-away portion extending in the axial direction, and the flow channel includes a region formed between the cut-away portion and the inner wall of the sleeve portion; and / or the inner peripheral wall of the sleeve portion has at least one groove extending in the axial direction, and the flow channel includes a region formed between the groove and the outer peripheral wall of the first needle portion; Alternatively, the first needle portion is provided with at least two convex ribs along its circumference, the convex ribs extending along the axial direction of the first needle portion, the first needle portion is fitted with a sliding clearance with the seat sleeve portion through the convex ribs, and the flow channel is formed between the wall portion of the first needle portion located between two adjacent convex ribs and the inner wall of the seat sleeve portion.

5. The electronic expansion valve according to claim 4, characterized in that: The upper end of the inner wall of the seat sleeve portion has an inclined wall section, and the radial distance between the inclined wall section and the first needle portion gradually decreases from top to bottom.

6. The electronic expansion valve according to claim 1, characterized in that: It also includes a nut component, the lower end of which is fixedly connected to the valve body component. The lower end of the nut component has a guide hole portion facing the seat sleeve portion, the valve needle and the guide hole portion are fitted in a sliding clearance, and the guide hole portion coincides with the axis of the sleeve cavity.

7. The electronic expansion valve according to claim 1, characterized in that: The valve body component includes a valve sleeve and a valve seat. The valve seat is fixedly arranged inside the valve sleeve. The valve seat includes a seat base and the seat sleeve. The valve seat is fixedly connected to the valve sleeve through the seat base. The valve sleeve is a tubular component with openings at both ends.

8. The electronic expansion valve according to claim 7, characterized in that: The valve seat divides the lumen of the valve sleeve into an upper cavity and a lower cavity. The valve cavity is formed in the upper cavity, and the valve port is communicated with the lower cavity.

9. The electronic expansion valve according to claim 8, characterized in that: The variable diameter hole section is in a conical shape, and its conical angle is greater than 90°.

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: It also includes a silencer, which is arranged in the sleeve cavity and / or the silencer is covered on the outer wall of the seat cover.

11. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: The outer peripheral wall of the seat sleeve portion facing the first interface has a planar wall portion.

12. The electronic expansion valve according to claim 11, characterized in that: The upper end surface of the seat cover portion is not lower than the upper edge of the first interface, and the area of ​​the planar wall portion is equivalent to the area of ​​the first interface.

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