Electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses an electronic expansion valve and refrigeration equipment, and relates to the technical field of electronic expansion valves. The electronic expansion valve comprises a valve body, a valve needle, a first connecting pipe and a flow guide structure, the valve body is provided with a valve cavity and a valve port communicated with the valve cavity, and the valve port is formed in the axial end of the valve body; the valve needle is movably arranged in the valve cavity and used for stretching into or being away from the valve port in the axial direction so as to adjust the opening degree of the valve port. The first connecting pipe is arranged on the side wall of the valve body and communicates with the valve cavity. The flow guide structure is arranged in the valve cavity and provided with a flow guide cavity communicated with the valve port so that fluid flowing in from the first connecting pipe can be guided to the valve port in the axial direction of the valve body. According to the technical scheme, turbulent flow caused by sudden change of the direction of fluid at the valve port can be avoided, and noise of the electronic expansion valve can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve and a refrigeration device. Background Art

[0002] The electronic expansion valve is an important component in the refrigeration system, and its main functions are throttling, pressure reduction and flow regulation.

[0003] The electronic expansion valve in the related art has a lateral flow pipe. When the fluid enters the valve cavity, it flows radially. However, when the radially flowing fluid enters the throttling hole, it suddenly turns to the axial direction, which causes turbulence in the valve cavity and causes greater noise. Utility Model Content

[0004] The main purpose of the utility model is to provide an electronic expansion valve, aiming to reduce the noise of the electronic expansion valve.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes an electronic expansion valve, comprising:

[0006] A valve body, provided with a valve cavity and a valve port communicated with the valve cavity, wherein the valve port is arranged at one axial end of the valve body;

[0007] A valve needle is movably disposed in the valve cavity and is used to extend into or away from the valve port in the axial direction to adjust the opening of the valve port;

[0008] A first connecting pipe, disposed on a side wall of the valve body and connected to the valve cavity; and

[0009] A flow guiding structure is arranged in the valve cavity, and the flow guiding structure has a flow guiding cavity communicated with the valve port, so as to guide the fluid flowing in from the first connecting pipe to the valve port along the axial direction of the valve body.

[0010] In one embodiment of the present application, the flow guiding structure is connected to the wall surface of the valve body where the valve port is arranged, and the flow guiding structure is arranged around the outer periphery of the valve needle.

[0011] In one embodiment of the present application, the flow guide structure is a cylindrical structure, and the extension direction of the flow guide cavity is consistent with the extension direction of the valve port.

[0012] In one embodiment of the present application, the central axis of the flow guide cavity is colinear with the central axis of the valve port.

[0013] In one embodiment of the present application, the guide cavity is a cylindrical cavity or a conical cavity.

[0014] In one embodiment of the present application, the valve body comprises:

[0015] A valve seat is provided with the valve cavity, and the first connecting pipe is provided on a side wall of the valve seat; and

[0016] A valve port seat is arranged at the axial end of the valve seat, the valve port seat is provided with the valve port, and the flow guide structure is connected to the valve port seat; wherein the valve port seat and the valve seat are an integral structure or a split structure.

[0017] In one embodiment of the present application, the flow guide structure and the valve seat are an integrated structure.

[0018] In one embodiment of the present application, the electronic expansion valve further comprises a guide sleeve mounted on the valve body, and the valve needle is slidably matched with the guide sleeve;

[0019] One end of the flow guide structure is connected to the guide sleeve, and the other end is connected to the wall of the valve body where the valve port is set, so that the flow guide cavity is formed in the flow guide structure, and the valve cavity is formed between the flow guide structure and the valve body. The flow guide structure is provided with a plurality of flow holes connecting the flow guide cavity and the valve cavity.

[0020] In one embodiment of the present application, the flow guiding structure is connected to one end of the guide sleeve close to the valve port, and the flow hole is provided at a position of the flow guiding structure close to the guide sleeve.

[0021] In one embodiment of the present application, the flow guide structure and the guide sleeve are an integrated structure.

[0022] In one embodiment of the present application, the inner diameter of the valve port is defined as D, and the inner diameter of the flow hole is defined as d, satisfying: d≥D.

[0023] In one embodiment of the present application, the length of the flow guide cavity in the axial direction of the valve body is defined as H, and the inner diameter of the valve port is defined as D, satisfying: H≥D.

[0024] In one embodiment of the present application, a radial gap between the cavity wall of the guide cavity and the outer wall of the valve needle is defined as L, and an inner diameter of the valve port is defined as D, satisfying: L≥0.5D.

[0025] To achieve the above object, the present application also provides an electronic expansion valve, comprising:

[0026] The valve body comprises a valve seat and a valve port seat arranged at an axial end of the valve seat, wherein the valve seat is provided with a valve cavity, and the valve port seat is provided with a valve port communicating with the valve cavity;

[0027] A first connecting pipe, disposed on a side wall of the valve body and connected to the valve cavity; and

[0028] A flow guiding structure, one end of which is connected to the valve port seat and the other end extends toward the valve cavity. The flow guiding structure is provided with a flow guiding cavity connecting the valve port and the valve cavity, and the flow guiding cavity is used to guide the fluid in the valve cavity along the axis of the valve body to the valve port.

[0029] To achieve the above object, the present application also provides an electronic expansion valve, comprising:

[0030] A valve body, provided with a valve cavity and a valve port communicated with the valve cavity, wherein the valve port is arranged at one axial end of the valve body;

[0031] A valve needle is axially movably disposed in the valve cavity and is used to adjust the opening of the valve port;

[0032] A guide sleeve, provided on the valve body, one end of the valve needle slidably fits in the guide sleeve;

[0033] A first connecting pipe, disposed on a side wall of the valve body and connected to the valve cavity; and

[0034] A flow guiding structure, one end of which is connected to the guide sleeve, and the other end of which extends to be connected to the wall of the valve body where the valve port is set. The flow guiding structure is provided with a flow guiding cavity connected to the valve port, and the flow guiding structure is provided with a flow hole connecting the flow guiding cavity and the valve cavity.

[0035] To achieve the above objectives, the present application also provides a refrigeration device, including the above electronic expansion valve.

[0036] In the electronic expansion valve of the technical solution of the utility model, the valve body has a valve cavity and a valve port, and the valve needle is movably arranged in the valve cavity, and can extend into or away from the valve port in the axial direction to achieve the function of adjusting the opening of the valve port. By arranging a flow-guiding structure in the valve cavity, the flow-guiding structure has a flow-guiding cavity connected to the valve port, and can comb the lateral fluid or radial fluid flowing in from the first connecting pipe into an axial fluid flowing along the axial direction of the valve body, and the axial fluid can match the extension direction of the valve port, so that the turbulence phenomenon caused by the sudden change of the direction of the fluid at the valve port can be avoided, and the effect of reducing the noise of the electronic expansion valve can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0038] Figure 1 This is a structural schematic diagram of an embodiment of the electronic expansion valve of the utility model;

[0039] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0040] Figure 3 for Figure 2 Dimensional relationship diagram of the axial length of the flow guide cavity and the inner diameter of the valve port in the embodiment;

[0041] Figure 4 This is a structural schematic diagram of another embodiment of the electronic expansion valve of the utility model;

[0042] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0043] Figure 6 This is a structural schematic diagram of another embodiment of the electronic expansion valve of the utility model;

[0044] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0045] Figure 8 for Figure 7 Dimensional relationship diagram of the axial length of the flow guide cavity and the inner diameter of the valve port in the embodiment;

[0046] Fig. 9 for Figure 6 A schematic diagram of the matching structure of the guide sleeve and the flow guide structure in the embodiment;

[0047] Fig.10 for Fig. 9 Cross-sectional view of an embodiment.

[0048] Description of Figure Numbers:

[0049] Label name Label name 100 Valve body 320 Second takeover 101 Valve cavity 400 Diversion structure 102 Valve port 401 Diversion cavity 103 wall 402 Through hole 110 Valve Seat 500 Guide sleeve 120 Valve seat 510 Guide section 200 Valve needle 610 Screw 310 First takeover 620 Nuts

[0050] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0054] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0055] In the related art, the electronic expansion valve has a lateral flow pipe. When the fluid enters the valve cavity from the lateral flow pipe, it flows radially. The valve port is located in the axial direction of the valve body and extends along the axial direction. The radially flowing fluid will suddenly turn to the axial direction when entering the valve port, which will cause turbulence of the fluid in the valve cavity and cause greater fluid noise.

[0056] Based on this, the utility model proposes an electronic expansion valve, which is intended to guide the fluid flowing in radially into the fluid flowing in the axial direction in the valve cavity, so that the flow direction of the fluid before entering the valve port is consistent with the extension direction of the valve port, thereby improving the turbulence of the fluid and reducing the fluid noise. The structure of the electronic expansion valve is described below in the form of an embodiment.

[0057] like Figure 1 , Figure 4 as well as Figure 6 As shown, the electronic expansion valve includes a valve body 100 , a valve needle 200 , a first connecting pipe 310 and a flow guiding structure 400 .

[0058] The valve body 100 is provided with a valve cavity 101 and a valve port 102 connected to the valve cavity 101, and the valve port 102 is provided at one axial end of the valve body 100; the valve needle 200 is movably provided in the valve cavity 101, and is used to extend into or away from the valve port 102 along the axial direction to adjust the opening of the valve port 102; the first connecting pipe 310 is provided on the side wall of the valve body 100, and is connected to the valve cavity 101; the guide structure 400 is provided in the valve cavity 101, and the guide structure 400 has a guide cavity 401 connected to the valve port 102, so as to guide the fluid flowing in from the first connecting pipe 310 to the valve port 102 along the axial direction of the valve body 100.

[0059] In this embodiment, the valve body 100 plays the role of supporting and installing the internal components of the electronic expansion valve (such as the valve needle 200, the flow guide structure 400, the guide sleeve 500, the screw 610 and the nut 620, etc.). The valve body 100 is provided with a valve cavity 101 and a valve port 102. The valve cavity 101 can accommodate the internal components of the electronic expansion valve and can also play the role of allowing the fluid to pass through; the valve port 102 plays the role of a throttle port, and the opening of the valve port 102 can be adjusted by the valve needle 200 extending into or away from the valve port 102 to achieve the function of adjusting the fluid flow. In actual application, a nut 620 and a screw 610 are provided in the valve body 100. The nut 620 is fixedly connected to the valve body 100, the screw 610 and the nut 620 are threadedly matched, and the valve needle 200 is connected to the screw 610. Therefore, when the screw 610 is rotated, the screw 610 can move axially at the same time, and then can drive the valve needle 200 to reciprocate in the axial direction, thereby realizing the function of adjusting the opening of the valve port 102.

[0060] It can be understood that the valve body 100 is provided with a first connecting pipe 310 and a second connecting pipe 320, which can be used as a fluid inlet pipe and a fluid outlet pipe, respectively. In this embodiment, the first connecting pipe 310 is provided on the side wall of the valve body 100 as an example for explanation, and the second connecting pipe 320 can be provided on the side wall of the valve body 100 or at the axial end of the valve body 100. The specific position of the second connecting pipe 320 is not specifically limited here. In actual application, the first connecting pipe 310 and the second connecting pipe 320 can be fitted with the valve body 100 by interference or welding. The first connecting pipe 310 is arranged on the side wall of the valve body 100, and the fluid flowing into the valve cavity 101 from the first connecting pipe 310 flows from the side of the valve body 100. At this time, the fluid entering from the first connecting pipe 310 is a lateral flow or a radial flow. The direction of the fluid is inconsistent with the extension direction of the valve port 102, which can easily cause a sudden change in the direction of the fluid and cause turbulence. For this reason, this embodiment provides a guide structure 400 in the valve cavity 101. The guide structure 400 has a guide cavity 401 connected to the valve port 102, which can comb the fluid flowing in from the first connecting pipe 310 into a fluid flowing along the axial direction of the valve body 100 to match the extension direction of the valve port 102, thereby avoiding fluid turbulence and reducing noise.

[0061] In practical applications, the specific structure of the flow-guiding structure 400 can be determined according to actual conditions, for example, it can be a sleeve structure, a block structure with a flow-guiding cavity, a strip structure or other special-shaped structures, etc., as long as it can ensure that the lateral flow of the first connecting pipe 310 is guided into an axial fluid.

[0062] In the electronic expansion valve of the technical solution of the utility model, the valve body 100 has a valve cavity 101 and a valve port 102, and the valve needle 200 is movably arranged in the valve cavity 101, and can extend into or away from the valve port 102 along the axial direction, so as to realize the function of adjusting the opening of the valve port 102. By arranging a flow guiding structure 400 in the valve cavity 101, the flow guiding structure 400 has a flow guiding cavity 401 connected with the valve port 102, and can comb the lateral fluid or radial fluid flowing in from the first connecting pipe 310 into an axial fluid flowing along the axial direction of the valve body 100, and the axial fluid can match the extension direction of the valve port 102, so as to avoid the turbulence phenomenon caused by the sudden change of the direction of the fluid at the valve port 102, so as to achieve the effect of reducing the noise of the electronic expansion valve.

[0063] In one embodiment of the present application, Figure 2 , Figure 5 as well as Figure 7 The flow guiding structure 400 is connected to the wall surface 103 of the valve body 100 where the valve port 102 is provided, and the flow guiding structure 400 is arranged around the outer periphery of the valve needle 200 .

[0064] In this embodiment, by connecting the flow guiding structure 400 to the wall surface 103 of the valve body 100 where the valve port 102 is set, the fluid in the valve cavity 101 needs to be guided and combed through the flow guiding cavity 401 before flowing to the valve port 102, which can prevent the fluid flowing in from the first connecting pipe 310 from directly entering the valve port 102 without being combed, causing turbulence. Such a configuration can achieve a better flow guiding and combing effect on the fluid, and further reduce fluid noise.

[0065] In addition, the guide structure 400 is arranged around the outer periphery of the valve needle 200, so that the valve needle 200 is in the guide cavity 401. Such a configuration can prevent the fluid flowing in from the first connecting pipe 310 from directly impacting the valve needle 200 and causing the valve needle 200 to shake, further improving the stability of the valve needle 200 and further reducing noise.

[0066] In one embodiment of the present application, Figure 2 , Figure 5 as well as Figure 7 The flow guiding structure 400 is a cylindrical structure, and the extending direction of the flow guiding structure 400 is consistent with the extending direction of the central axis of the valve port 102 .

[0067] In this embodiment, the flow guiding structure 400 has two opposite axial ends, one end of which is connected to the wall surface of the valve body 100 where the valve port 102 is provided, and the other end extends in a direction away from the valve port 102. The extending direction of the flow guiding structure 400 is consistent with the extending direction of the central axis of the valve port 102, so that the flow direction of the fluid is consistent with the extending direction of the central axis of the valve port 102, so that the distribution of the fluid at the valve port 102 is more uniform, which can further improve the noise reduction effect.

[0068] Furthermore, the central axis of the flow guiding cavity 401 is colinear with the central axis of the valve port 102. This arrangement enables the fluid to enter the valve port 102 more evenly, and the noise reduction effect is better.

[0069] In practical applications, the shape and structure of the flow guiding cavity 401 can be determined according to the actual situation, as long as the lateral flow can be guided to a fluid that matches the extension direction of the central axis of the valve port 102. Optionally, the flow guiding cavity 401 is a cylindrical cavity (such as Figures 1 to 3 ) or conical cavity (such as Figure 4 and Figure 5 ).

[0070] In one embodiment of the present application, Figure 1 and Figure 6 The valve body 100 includes a valve seat 110 and a valve port seat 120. The valve seat 110 is provided with a valve cavity 101. The first connecting pipe 310 is provided on the side wall of the valve seat 110. The valve port seat 120 is provided at the axial end of the valve seat 110. The valve port seat 120 is provided with a valve port 102. The guide structure 400 is connected to the valve port seat 120. The valve port seat 120 and the valve seat 110 are an integral structure or a split structure.

[0071] This embodiment illustrates the structure of the valve body 100, and a valve cavity 101 is formed in the valve seat 110, and components such as the valve needle 200, the screw 610, and the nut 620 are installed in the valve seat 110. The valve port seat 120 is arranged at the axial end of the valve seat 110, and the valve port 102 is arranged on the valve port seat 120 for the valve needle 200 to be inserted or removed to adjust the flow. In actual application, the valve port seat 120 and the valve seat 110 can be an integral structure, or a split structure, and the specific structural method is not limited here. When it is an integral structure, it can be manufactured by processes such as mold molding, 3D printing, and so on. When it is a split structure, it can be assembled and fixed by welding, clamping, or interference connection after being separately molded.

[0072] In this embodiment, the guide structure 400 is connected to the valve port seat 120 so that the fluid in the valve cavity 101 needs to be guided and combed by the guide cavity 401 before flowing to the valve port 102, thereby achieving a better guiding and combing effect on the fluid and further reducing fluid noise.

[0073] It is understandable that the connection method between the flow guide structure 400 and the valve seat 120 can be determined according to actual conditions. For example, the two can be an integral structure, or the two can be separately formed and then fixed by welding or interference fit. Figures 1 to 5 Considering factors such as the difficulty of the processing technology and the assembly method, as an example, the guide structure 400 and the valve seat 120 are an integrated structure, which can not only simplify the molding process but also reduce the assembly steps.

[0074] In one embodiment of the present application, Figures 6 to 10 The electronic expansion valve also includes a guide sleeve 500 installed on the valve body 100, and the valve needle 200 is slidably matched with the guide sleeve 500; one end of the guide structure 400 is connected to the guide sleeve 500, and the other end is connected to the wall 103 of the valve body 100 where the valve port 102 is set, so that a guide cavity 401 is formed in the guide structure 400, and a valve cavity 101 is formed between the guide structure 400 and the valve body 100, and the guide structure 400 is provided with a plurality of flow holes 402 connecting the guide cavity 401 and the valve cavity 101.

[0075] In this embodiment, the guide sleeve 500 plays a role in supporting and guiding the valve needle 200. The flow guide structure 400 is connected to the valve port seat 120 and the guide sleeve 500 respectively, and the lateral flow entering from the first connecting pipe 310 can enter the flow guide cavity 401 through the flow hole 402 for guidance and combing, and then flow into the valve port 102.

[0076] In actual application, the guide structure 400 can be respectively abutted against the wall surface of the valve port seat 120 and the end surface of the guide sleeve 500, or the guide structure 400 can be fixed to the valve port seat 120 at one end and extend to abut against the end surface of the guide sleeve 500 at the other end, or the guide structure 400 can be fixed to the guide sleeve 500 at one end and extend to abut against the wall surface of the valve port seat 120 at the other end.

[0077] In practical applications, the shape and structure of the flow hole 402 can be determined according to actual conditions, such as a circular hole, a square hole, a strip hole, a triangular hole or other special-shaped holes, etc. The number of the flow holes 402 can also be determined according to actual conditions, such as 1, 2, 3, 4 or more, etc. As long as it can ensure that the fluid in the valve cavity 101 can smoothly enter the guide cavity 401.

[0078] In one embodiment of the present application, Figure 7 , Fig. 9 as well as Fig.10 The inner wall of the guide sleeve 500 has a guide section 510 that cooperates with the valve needle 200 , and the flow guide structure 400 is connected to the end of the guide section 510 ; the flow hole 402 is provided at a position of the flow guide structure 400 close to the guide section 510 .

[0079] In this embodiment, by arranging the flow hole 402 at a position of the guide structure 400 close to the guide section 510, the flow path of the fluid after entering the guide cavity 401 can be extended, that is, the guiding combing path of the guide cavity 401 for the fluid can be extended, thereby ensuring a better fluid combing effect.

[0080] Furthermore, if Figure 8 and Fig.10 , define the inner diameter of the valve port 102 as D, and the inner diameter of the flow hole 402 as d, satisfying: d ≥ D. It can be understood that the fluid in the valve cavity 101 enters the guide cavity 401 from the flow hole 402, so the inner diameter of the flow hole 402 cannot be too small. If it is too small, it is easy to cause throttling of the fluid at the flow hole 402, which will affect the control of the flow rate by the electronic expansion valve. In this embodiment, the inner diameter d of the flow hole 402 is set to be not less than the inner diameter D of the valve port 102, so that the flow area of ​​the flow hole 402 is not less than the flow area of ​​the valve port 102, so that no throttling phenomenon will be caused to the fluid, and the accuracy of the electronic expansion valve in controlling the fluid flow rate is ensured.

[0081] The connection method between the guide structure 400 and the guide sleeve 500 can be determined according to the actual situation. For example, the two can be an integral structure, or the two can be separately formed and then fixed by welding or interference fit. Fig. 9 and Fig.10 Taking into account factors such as the difficulty of the processing technology and the assembly method, as an example, the guide structure 400 and the guide sleeve 500 are an integrated structure, which can not only simplify the molding process, but also reduce the assembly steps.

[0082] In one embodiment of the present application, Figure 3 and Figure 8 , the length of the guide cavity 401 in the axial direction of the valve body 100 is defined as H, and the inner diameter of the valve port 102 is defined as D, satisfying: H≥D.

[0083] It is understandable that the fluid in the valve cavity 101 will pass through the guiding and combing effect of the guide cavity 401 before entering the valve port 102, so the length H of the guide cavity 401 in the axial direction of the valve body 100 should not be too short. If it is too short, the guide cavity 401 may not have time to comb the fluid into axial flow before entering the valve port 102, and the guiding effect is poor. Based on this, this embodiment sets the length H of the guide cavity 401 in the axial direction of the valve body 100 to be greater than or equal to the inner diameter D of the valve port 102, so that the guide cavity 401 has enough length to guide and comb the fluid, thereby ensuring a good guiding effect.

[0084] In one embodiment of the present application, Figure 3 and Figure 8, the radial clearance between the cavity wall of the guide cavity 401 and the outer wall of the valve needle 200 is defined as L, and the inner diameter of the valve port 102 is defined as D, satisfying: L≥0.5D.

[0085] It can be understood that the fluid in the valve cavity 101 will pass through the guiding and combing effect of the guide cavity 401 before entering the valve port 102. When the valve needle 200 is in the guide cavity 401, the fluid flows through the gap between the cavity wall of the guide cavity 401 and the outer wall of the valve needle 200. Therefore, the size of the radial gap L between the cavity wall of the guide cavity 401 and the outer wall of the valve needle 200 cannot be too small. If it is too small, it is easy to cause throttling of the fluid before the fluid reaches the valve port 102, which will affect the control of the flow rate by the electronic expansion valve. Based on this, in this embodiment, the radial gap L between the cavity wall of the guide cavity 401 and the outer wall of the valve needle 200 is set to be greater than or equal to half of the inner diameter D of the valve port 102. In this way, the flow area of ​​the guide cavity 401 is not less than the flow area of ​​the valve port 102, so that the throttling phenomenon will not be caused to the fluid, and the accuracy of the electronic expansion valve in controlling the fluid flow rate is guaranteed.

[0086] The utility model also provides an electronic expansion valve, such as Figures 1 to 5 The electronic expansion valve comprises a valve body 100, a first connecting pipe 310 and a flow guiding structure 400. The valve body 100 comprises a valve seat 110 and a valve port seat 120 arranged at an axial end of the valve seat 110. The valve seat 110 is provided with a valve cavity 101, and the valve port seat 120 is provided with a valve port 102 communicating with the valve cavity 101. The first connecting pipe 310 is arranged on the side wall of the valve body 100 and is communicated with the valve cavity 101. One end of the flow guiding structure 400 is connected to the valve port seat 120, and the other end extends toward the valve cavity 101. The flow guiding structure 400 is provided with a flow guiding cavity 401 communicating with the valve port 102 and the valve cavity 101. The flow guiding cavity 401 is used to guide the fluid in the valve cavity 101 to the valve port 102 along the axis of the valve body 100.

[0087] In this embodiment, the valve body 100 includes a valve seat 110 and a valve port seat 120. A valve cavity 101 is formed in the valve seat 110. The valve needle 200, the screw rod 610, the nut 620 and other components are installed in the valve seat 110. The valve port seat 120 is arranged at the axial end of the valve seat 110, and the valve port 102 is arranged on the valve port seat 120 for the valve needle 200 to be inserted or removed to adjust the flow. By arranging a flow guide structure 400 on the valve port seat 120, the flow guide structure 400 extends toward the valve cavity 101, so that a flow guide cavity 401 connected with the valve port 102 is formed in the flow guide structure 400. The flow guide cavity 401 can comb the lateral fluid or radial fluid flowing from the first connecting pipe 310 into an axial fluid flowing along the axial direction of the valve body 100, and the axial fluid can match the axial extension direction of the valve port 102, so that the turbulence phenomenon caused by the sudden change of direction of the fluid at the valve port 102 can be avoided, so as to achieve the effect of reducing the noise of the electronic expansion valve.

[0088] By connecting the flow guiding structure 400 to the valve port seat 120, the fluid in the valve cavity 101 needs to be guided and combed by the flow guiding cavity 401 before flowing to the valve port 102, which can prevent the fluid flowing in from the first connecting pipe 310 from directly entering the valve port 102 without being combed, causing turbulence. Such a configuration can achieve a better flow guiding and combing effect on the fluid, and further reduce fluid noise.

[0089] It is understandable that the connection method between the flow guide structure 400 and the valve seat 120 can be determined according to actual conditions. For example, the two can be an integral structure, or the two can be separately formed and then fixed by welding or interference fit. Figures 1 to 5 Considering factors such as the difficulty of the processing technology and the assembly method, as an example, the guide structure 400 and the valve seat 120 are an integrated structure, which can not only simplify the molding process but also reduce the assembly steps.

[0090] The utility model also provides an electronic expansion valve, such as Figures 6 to 10 The electronic expansion valve comprises a valve body 100, a valve needle 200, a guide sleeve 500, a first pipe 310 and a flow guide structure 400. The valve body 100 is provided with a valve cavity 101 and a valve port 102 connected to the valve cavity 101. The valve port 102 is provided at one axial end of the valve body 100. The valve needle 200 is axially movable in the valve cavity 101 to adjust the opening of the valve port 102. The guide sleeve 500 is provided at the valve body 100. One end of the valve needle Slidingly fitted with the guide sleeve 500; the first connecting pipe 310 is arranged on the side wall of the valve body 100 and is connected to the valve cavity 101; one end of the guide structure 400 is connected to the guide sleeve 500, and the other end extends to be connected to the wall 103 of the valve body 100 where the valve port 102 is set, the guide structure 400 is provided with a guide cavity 401 connected with the valve port 102, and the guide structure 400 is provided with a flow hole 402 connecting the guide cavity 401 and the valve cavity 101.

[0091] In this embodiment, the valve body 100 has a valve cavity 101 and a valve port 102. A movable valve needle 200 is provided in the valve body 100. The guide sleeve 500 plays a role in supporting and guiding the valve needle 200, so that the valve needle 200 can extend into or away from the valve port 102 along the axial direction, thereby realizing the function of adjusting the opening of the valve port 102. The flow guide structure 400 connects the valve body 100 and the guide sleeve 500 respectively. The flow guide structure 400 is provided with a flow guide cavity 401 connected to the valve port 102 and a flow hole 402 connected to the flow guide cavity 401 and the valve cavity 101. The lateral flow entering from the first connecting pipe 310 can enter the flow guide cavity 401 through the flow hole 402 for guiding and combing, and then flow into the valve port 102. In this way, the turbulence phenomenon caused by the sudden change of direction of the fluid at the valve port 102 can be avoided, thereby achieving the effect of reducing the noise of the electronic expansion valve.

[0092] Optionally, the shape and structure of the flow hole 402 can be determined according to actual conditions, such as a circular hole, a square hole, a strip hole, a triangular hole or other special-shaped holes, etc. The number of the flow holes 402 can also be determined according to actual conditions, such as 1, 2, 3, 4 or more, etc. As long as it can ensure that the fluid in the valve cavity 101 can smoothly enter the guide cavity 401.

[0093] The utility model also provides a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The refrigeration device can be an air conditioner or a refrigerator.

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body, provided with a valve cavity and a valve port communicated with the valve cavity, wherein the valve port is arranged at one axial end of the valve body; A valve needle is axially movably disposed in the valve cavity and is used to adjust the opening of the valve port; A first connecting pipe is provided on the side wall of the valve body and communicated with the valve cavity; as well as A flow guiding structure is arranged in the valve cavity, and the flow guiding structure has a flow guiding cavity communicated with the valve port, so as to guide the fluid flowing in from the first connecting pipe to the valve port along the axial direction of the valve body.

2. The electronic expansion valve according to claim 1, characterized in that: The flow guiding structure is connected to the wall surface of the valve body where the valve port is arranged, and the flow guiding structure is arranged around the outer periphery of the valve needle.

3. The electronic expansion valve according to claim 2, characterized in that: The flow guide structure is a cylindrical structure, and the extension direction of the flow guide cavity is consistent with the extension direction of the central axis of the valve port.

4. The electronic expansion valve according to claim 3, characterized in that: The central axis of the flow guide cavity is collinear with the central axis of the valve port.

5. The electronic expansion valve according to claim 4, characterized in that: The flow guiding cavity is a cylindrical cavity or a conical cavity.

6. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The valve body comprises: A valve seat is provided with the valve cavity, and the first connecting pipe is provided on a side wall of the valve seat; and A valve port seat is arranged at the axial end of the valve seat, the valve port seat is provided with the valve port, and the flow guide structure is connected to the valve port seat; wherein the valve port seat and the valve seat are an integral structure or a split structure.

7. The electronic expansion valve according to claim 6, characterized in that: The flow guiding structure and the valve seat are an integrated structure.

8. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The electronic expansion valve further comprises a guide sleeve mounted on the valve body, and the valve needle is slidably matched with the guide sleeve; One end of the flow guide structure is connected to the guide sleeve, and the other end is connected to the wall of the valve body where the valve port is set, so that the flow guide cavity is formed in the flow guide structure, and the valve cavity is formed between the flow guide structure and the valve body. The flow guide structure is provided with a plurality of flow holes connecting the flow guide cavity and the valve cavity.

9. The electronic expansion valve according to claim 8, characterized in that: The flow guiding structure is connected to one end of the guide sleeve close to the valve port, and the flow hole is arranged at a position of the flow guiding structure close to the guide sleeve.

10. The electronic expansion valve according to claim 8, characterized in that: The flow guide structure and the guide sleeve are an integrated structure.

11. The electronic expansion valve according to claim 8, characterized in that: The inner diameter of the valve port is defined as D, and the inner diameter of the flow hole is defined as d, satisfying: d≥D.

12. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The length of the flow guide cavity in the axial direction of the valve body is defined as H, and the inner diameter of the valve port is defined as D, satisfying: H≥D.

13. The electronic expansion valve according to any one of claims 2 to 5, characterized in that: The radial clearance between the cavity wall of the flow guide cavity and the outer wall of the valve needle is defined as L, and the inner diameter of the valve port is defined as D, satisfying: L≥0.5D.

14. An electronic expansion valve, characterized in that: include: The valve body comprises a valve seat and a valve port seat arranged at an axial end of the valve seat, wherein the valve seat is provided with a valve cavity, and the valve port seat is provided with a valve port communicating with the valve cavity; A first connecting pipe, disposed on a side wall of the valve body and connected to the valve cavity; and A flow guiding structure, one end of which is connected to the valve port seat and the other end extends toward the valve cavity. The flow guiding structure is provided with a flow guiding cavity connecting the valve port and the valve cavity, and the flow guiding cavity is used to guide the fluid in the valve cavity along the axis of the valve body to the valve port.

15. An electronic expansion valve, characterized in that: include: A valve body, provided with a valve cavity and a valve port communicated with the valve cavity, wherein the valve port is arranged at one axial end of the valve body; A valve needle is axially movably disposed in the valve cavity and is used to adjust the opening of the valve port; A guide sleeve, provided on the valve body, one end of the valve needle slidably fits in the guide sleeve; A first connecting pipe is provided on the side wall of the valve body and communicated with the valve cavity; as well as A flow guiding structure, one end of which is connected to the guide sleeve, and the other end of which extends to be connected to the wall of the valve body where the valve port is set. The flow guiding structure is provided with a flow guiding cavity connected to the valve port, and the flow guiding structure is provided with a flow hole connecting the flow guiding cavity and the valve cavity.

16. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 15.

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