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 flow guide structure and a first connecting pipe, 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 flow guide structure is arranged in the valve cavity and provided with a flow guide cavity communicating with the valve cavity and the valve port, and the extending direction of the flow guide cavity is consistent with the extending direction of the central axis of the valve port. The first connecting pipe is arranged on the side wall of the valve body and provided with a first outlet communicating with the valve cavity, and the central axis of the first outlet does not intersect with the central axis of the valve cavity so that fluid flowing in from the first outlet can flow into the flow guide cavity in the valve cavity in a rotational flow mode. According to the technical scheme, the turbulence phenomenon of fluid can be improved, pressure pulsation in the valve port can be reduced, and then noise can be reduced.

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 technology has a lateral flow connection pipe. The fluid flows laterally when entering the valve cavity and flows axially when entering the valve port. This will cause the fluid to form a violent turbulent field in the valve cavity, resulting in large fluid pressure pulsations during the throttling process and causing large 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] To achieve the above-mentioned purpose, the electronic expansion valve proposed by the utility model comprises:

[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 flow guiding structure, disposed in the valve cavity and having a flow guiding cavity connecting the valve cavity and the valve port, wherein an extending direction of the flow guiding cavity is consistent with an extending direction of a central axis of the valve port; and

[0008] A first connecting pipe is arranged on the side wall of the valve body, and the first connecting pipe is provided with a first outlet connected to the valve cavity. The central axis of the first outlet does not intersect with the central axis of the valve cavity, so that the fluid flowing in from the first outlet can swirl in the valve cavity to the guide cavity.

[0009] In one embodiment of the present application, the electronic expansion valve further comprises a valve needle disposed in the valve cavity, and the valve needle can axially extend into or move away from the valve port;

[0010] The flow guide structure is sleeved on the outside of the valve needle and connected to the wall surface of the valve body where the valve port is arranged, so that the flow guide cavity is arranged around the periphery of the valve needle.

[0011] In one embodiment of the present application, the cavity wall surface of the guide cavity is an arc surface, and the guide cavity is coaxially arranged with the valve needle; on the radial cross section of the guide structure, the guide cavity is in a circular ring shape.

[0012] In one embodiment of the present application, the outer circumferential surface of the flow guide structure is an arc surface, the cavity wall surface of the valve cavity is an arc surface, and the outer circumferential surface of the flow guide structure is coaxially arranged with the cavity wall surface of the valve cavity.

[0013] In one embodiment of the present application, in the projection of the radial cross section of the valve body, the side wall of the first outlet away from the center of the valve cavity is tangent to the cavity wall surface of the valve cavity.

[0014] In an embodiment of the present application, in the projection of the radial cross section of the valve body, the central axis of the first outlet is located outside the flow guide structure.

[0015] In one embodiment of the present application, a first guide slope is provided on the wall surface of the guide cavity at one end away from the valve port;

[0016] And / or, a second guide slope is provided on the outer peripheral surface of the flow guide structure at one end away from the valve port.

[0017] 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 D1, satisfying: L≥0.5D1.

[0018] In one embodiment of the present application, the length of the 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 D1, satisfying: H≥D1.

[0019] In an embodiment of the present application, the inner diameter of the first outlet is defined as D2, and the inner diameter of the valve port is defined as D1, satisfying: D2 ≥ D1.

[0020] In an embodiment of the present application, the first connecting pipe is eccentrically arranged with respect to the valve chamber, and the first outlet is arranged at an axial end of the first connecting pipe.

[0021] In one embodiment of the present application, the valve body comprises:

[0022] 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

[0023] The 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 arranged on the valve port seat; wherein the valve port seat and the valve seat are an integral structure or a split structure.

[0024] To achieve the above objectives, the present application also provides a refrigeration device, including the above electronic expansion valve.

[0025] 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 along the axial direction to realize the function of adjusting the valve port opening, thereby achieving the purpose of adjusting the flow rate. The first connecting pipe is arranged on the side wall of the valve body, and the first outlet is eccentrically arranged with the valve cavity, so that the fluid flowing in from the first outlet can form a swirl in the valve cavity, and at the same time, a guide structure is arranged in the valve cavity, and the guide structure has a guide cavity connected to the valve port, so that the fluid in the valve cavity can swirl to the guide cavity and further swirl to the valve port, so that the fluid at the valve port is more uniform, so that the turbulence phenomenon of the fluid can be improved, the pressure pulsation in the valve port can be reduced, and the noise can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 This is a structural schematic diagram of an embodiment of the electronic expansion valve of the utility model;

[0028] Figure 2 for Figure 1 Sectional view at MM;

[0029] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0030] Figure 4 for Figure 3 Schematic diagram of the dimensions between the wall of the flow guiding cavity and the valve needle, the dimensions of the valve port, and the length of the flow guiding cavity in the embodiment;

[0031] Figure 5 for Figure 1 Cross-sectional view at NN in the figure.

[0032] Description of Figure Numbers:

[0033] Label name Label name 100 Valve body 320 Second takeover 101 Valve cavity 400 Diversion structure 102 Valve port 401 Diversion cavity 110 Valve Seat 402 First guide slope 120 Valve seat 403 Second guide slope 200 Valve needle 500 Guide sleeve 310 First takeover

[0034] 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

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The electronic expansion valve in the related technology has a lateral flow connection pipe. The fluid flows laterally when entering the valve cavity and flows axially when entering the valve port. This will cause the fluid to form a violent turbulent field in the valve cavity, resulting in large fluid pressure pulsations during the throttling process and causing large noise.

[0040] Based on this, the present invention proposes an electronic expansion valve, which is intended to form multiple swirls in the valve cavity from the fluid flowing in radially, and flow to the valve port in a spiral flow manner, thereby improving the turbulence of the fluid, reducing the pressure pulsation in the valve port, and further reducing noise. The structure of the electronic expansion valve is described below in the form of an embodiment.

[0041] like Figures 1 to 5 As shown, the electronic expansion valve includes a valve body 100 , a valve needle 200 , a first connecting pipe 310 , a second connecting pipe 320 and a flow guiding structure 400 .

[0042] 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 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, and the extension direction of the guide cavity 401 is consistent with the extension direction of the central axis of the valve port 102; the first connecting pipe 310 is provided on the side wall of the valve body 100, and the first connecting pipe 310 is provided with a first outlet 301 connected to the valve cavity 101, and the central axis of the first outlet 301 does not intersect with the central axis of the valve cavity 101, so that the fluid flowing in from the first outlet 301 can swirl in the valve cavity 101 to the guide cavity 401.

[0043] 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 and the nut, 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 and a screw are provided in the valve body 100, the nut is fixedly connected to the valve body 100, the screw is threadedly matched with the nut, and the valve needle 200 is connected to the screw, so that when the screw is rotated, the screw can move axially at the same time, and then the valve needle 200 can be driven to reciprocate in the axial direction to achieve the function of adjusting the opening of the valve port 102.

[0044] 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 can be provided at the axial end of the valve body 100, and the specific position of the second connecting pipe 320 is not specifically limited here. In practical application, the first connecting pipe 310 and the second connecting pipe 320 can be fitted with the valve body 100 by interference fitting or welding. The first connecting pipe 310 is provided 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 outlet 301 of the first connecting pipe 310 flows sideways, and the valve port 102 is located at one axial end of the valve cavity 101, and the fluid in the valve cavity 101 is easy to cause turbulence. To this end, in this embodiment, the position of the first outlet 301 is improved so that the central axis of the first outlet 301 does not intersect with the central axis of the valve cavity 101, so that after the fluid in the first connecting pipe 310 flows into the valve cavity 101 from the first outlet 301, a vortex can be formed in the valve cavity 101. At the same time, in this embodiment, a guide structure 400 is also provided in the valve cavity 101. The guide structure 400 has a guide cavity 401 connected to the valve port 102, and the extension direction of the guide cavity 401 is consistent with the extension direction of the central axis of the valve port 102, so that the fluid in the valve cavity 101 can swirl into the guide cavity 401. Since the fluid already has a swirl speed when entering the guide cavity 401, the fluid will still flow in a swirl after entering the guide cavity 401, and then flow in a spiral shape to the valve port 102, thereby avoiding fluid turbulence and reducing noise.

[0045] It should be noted that, in this embodiment, the fluid entering from the first outlet 301 forms a preliminary swirl before entering the guide cavity 401, and then further swirls in the guide cavity 401 to form a double-stage swirl effect. Compared with the solution of directly swirl from the first outlet 301 to the valve port 102, this embodiment can extend the path length of the fluid swirl, so that the fluid is more uniform when entering the valve port 102, and the effect of reducing pressure pulsation and noise reduction is better.

[0046] 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.

[0047] The central axis of the first outlet 301 does not intersect with the central axis of the valve cavity 101. It can be understood that the first outlet 301 is eccentrically arranged with respect to the valve cavity 101. In the projection of the radial cross section of the valve body 100, the orientation of the first outlet 301 is misaligned with the valve port 102. In actual application, the first outlet 301 can be completely misaligned with the valve port 102, or can be partially misaligned.

[0048] In the electronic expansion valve of the utility model technical solution, 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, and thus achieve the purpose of adjusting the flow rate. The first connecting pipe 310 is arranged on the side wall of the valve body 100, and the first outlet 301 and the valve cavity 101 are eccentrically arranged, so that the fluid flowing in from the first outlet 301 can form a swirl in the valve cavity 101, and at the same time, a guide structure 400 is arranged in the valve cavity 101, and the guide structure 400 has a guide cavity 401 connected with the valve port 102, so that the fluid in the valve cavity 101 can swirl to the guide cavity 401 and further swirl to the valve port 102, so that the fluid at the valve port 102 is more uniform, so that the turbulence phenomenon of the fluid can be improved, the pressure pulsation in the valve port can be reduced, and the noise can be reduced.

[0049] In one embodiment of the present application, Figure 2 and Figure 3 The flow guide structure 400 is sleeved on the outside of the valve needle 200 and connected to the wall surface of the valve body 100 where the valve port 102 is set, so that the flow guide cavity 401 is set around the periphery of the valve needle 200.

[0050] In this embodiment, by connecting the flow guiding structure 400 to the wall surface 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 setting can achieve a better flow guiding and combing effect on the fluid, and further reduce fluid noise.

[0051] In addition, the guide structure 400 is arranged around the outer periphery of the valve needle 200, so that the guide cavity 401 is arranged around the periphery of the valve needle 200, so that the fluid swirling into the guide cavity 401 can continue to rotate and flow around the periphery of the valve needle 200, thereby improving the uniformity of the fluid at the valve port 102; in addition, it can also avoid the situation where the fluid positively impacts the valve needle 200 and causes the valve needle 200 to shake, further improving the stability of the valve needle 200, and at the same time can further reduce noise.

[0052] Furthermore, if Figure 5The wall surface of the flow guiding cavity 401 is an arc surface, and the flow guiding cavity 401 is coaxially arranged with the valve needle 200; on the radial cross section of the flow guiding structure 400, the flow guiding cavity 401 is in a circular ring shape.

[0053] In this embodiment, by setting the cross-section of the guide cavity 401 to be annular, the fluid in the guide cavity 401 can rotate and flow more evenly around the periphery of the valve needle 200, thereby allowing the fluid to enter the valve port 102 more evenly, thereby achieving a better noise reduction effect.

[0054] Optionally, the flow guiding cavity 401 is a cylindrical cavity or a conical cavity.

[0055] In one embodiment of the present application, Figure 5 The outer peripheral surface of the flow guiding structure 400 is an arc surface, the cavity wall surface of the valve cavity 401 is an arc surface, and the outer peripheral surface of the flow guiding structure 400 is coaxially arranged with the cavity wall surface of the valve cavity 101.

[0056] In this embodiment, the guide structure 400 is a cylindrical structure. By setting the outer circumferential surface of the guide structure 400 to a circular arc surface, and the cavity wall surface of the valve cavity 401 to a circular arc surface, a fluid space with a circular ring cross-sectional shape is formed between the outer circumferential surface of the guide structure 400 and the cavity wall surface of the valve cavity 101. When the fluid enters from the first outlet 301, it can rotate and flow along the cavity wall surface of the valve cavity 101 and the outer circumferential surface of the guide structure 400. In this way, the guiding and combing effect of the fluid flowing out of the first outlet 301 can be further enhanced, so that the fluid can swirl in the valve cavity 101 to the guide cavity 401, so that the fluid entering the guide cavity 401 is more uniform, thereby reducing pressure pulsation.

[0057] Furthermore, if Figure 5 In the projection of the radial cross section of the valve body 100 , the side wall of the first outlet 301 away from the center of the valve cavity 101 is tangent to the cavity wall surface of the valve cavity 101 .

[0058] In this embodiment, the side wall of the first outlet 301 away from the center of the valve cavity 101 is tangent to the cavity wall surface of the valve cavity 101, so that at least part of the fluid in the first connecting pipe 310 can flow out from the first outlet 301 along the tangent direction of the cavity wall surface of the valve cavity 101, and flow along the cavity wall surface of the valve cavity 101 which is a circular arc surface, thereby realizing swirl; another part of the fluid can flow from the first outlet 301 to the cavity wall surface of the valve cavity 101, and then realize swirl under the guiding action of the cavity wall surface of the valve cavity 101 and the guiding action of the front part of the fluid.

[0059] In order to further enhance the swirl effect, Figure 5 In one embodiment of the present application, in the projection of the radial cross section of the valve body 100 , the central axis of the first outlet 301 is located outside the flow guide structure 400 .

[0060] Such a configuration can make the first outlet 301 and the guide structure 400 more staggered, so that the fluid flowing out of the first outlet 301 will flow through the same side of the guide structure 400, thereby avoiding the situation where the fluid flows through both sides of the guide structure 400 and causes interference turbulence. In this way, the combing and guiding effect of the fluid can be further enhanced, and the swirl effect of the fluid can be made more uniform, thereby achieving a better noise reduction effect.

[0061] In one embodiment of the present application, Figure 3 A first guide slope 402 is provided on the wall of the guide cavity 401 at one end away from the valve port 102 .

[0062] In this embodiment, the first guide bevel 402 can play a transition guiding role when the fluid in the valve cavity 101 flows into the guide cavity 401. Specifically, the first guide bevel 402 is inclined toward the center of the valve cavity 101 from the end away from the valve port 102 to the end close to the valve port 102, so that the fluid can swirl from the outside to the inside with less resistance.

[0063] In one embodiment of the present application, Figure 3 A second inclined guide surface 403 is provided on the outer peripheral surface of the flow guiding structure 400 at one end away from the valve port 102 .

[0064] In this embodiment, the second guide slope 403 is inclined toward the center of the valve cavity 101 from one end close to the valve port 102 to the end away from the valve port 102, which can guide the fluid flowing in from the first outlet 301 to the end of the guide structure 400, so that the fluid can enter the guide cavity 401 more smoothly, reducing the fluid resistance.

[0065] In one embodiment of the present application, Figure 3 and Figure 4 , 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 D1, satisfying: L≥0.5D1.

[0066] 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 D1 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.

[0067] In one embodiment of the present application, Figure 3 and Figure 4 , 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 D1, satisfying: H≥D1.

[0068] 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 guide and comb the fluid 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 D1 of the valve port 102, so that the guide cavity 401 has enough length to guide and comb the fluid, thereby extending the guiding length and ensuring a good guiding effect.

[0069] In one embodiment of the present application, Figure 4 and Figure 5 , define the inner diameter of the first outlet 301 as D2, and the inner diameter of the valve port 102 as D1, satisfying: D2 ≥ D1.

[0070] It can be understood that the fluid in the first connecting pipe 310 enters the valve chamber 101 through the first outlet 301, and the inner diameter D2 of the first outlet 301 cannot be too small. If it is too small, it is easy to cause throttling at the first outlet 301, which will affect the control of the flow rate by the electronic expansion valve. In this embodiment, the inner diameter D2 of the first outlet 301 is set to be not less than the inner diameter D1 of the valve port 102, so that the flow area of ​​the first outlet 301 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.

[0071] In one embodiment of the present application, Figure 1 and Figure 5 The first connecting pipe 310 is eccentrically arranged with respect to the valve chamber 101 , and the first outlet 301 is arranged at the axial end of the first connecting pipe 310 .

[0072] In this embodiment, by directly eccentrically setting the first connecting pipe 310 to the valve cavity 101, the pipe opening at the end of the first connecting pipe 310 is the first outlet 301, so that the central axis of the first outlet 301 and the central axis of the valve port 102 can be staggered only by installing the first connecting pipe 310 on the valve body 100, without the need to open additional outlets at other locations on the first connecting pipe 310 (such as the side wall of the pipe), thereby simplifying the molding process and improving production efficiency.

[0073] In actual application, the first connecting pipe 310 eccentrically arranged with respect to the valve cavity 101 may extend into the valve cavity 101 , or may not extend into the valve cavity 101 .

[0074] In one embodiment of the present application, Figure 2 and Figure 3 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, and the first connecting pipe 310 is arranged on the side wall of the valve seat 110; the valve port seat 120 is arranged at the axial end of the valve seat 110, the valve port seat 120 is provided with a valve port 102, and the guide structure 400 is arranged on the valve port seat 120; wherein, the valve port seat 120 and the valve seat 110 are an integral structure or a split structure.

[0075] 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, and the nut 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.

[0076] In this embodiment, the guide structure 400 is arranged on 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.

[0077] It is understandable that the connection method of the flow guide structure 400 and the valve seat 120 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 fixed by welding or interference fit. In practical applications, considering factors such as the difficulty of the processing technology and the assembly method, as an example, the flow guide structure 400 and the valve seat 120 are an integral structure, which can simplify the molding process and reduce the assembly steps.

[0078] 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.

[0079] 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 flow guiding structure, disposed in the valve cavity and having a flow guiding cavity connecting the valve cavity and the valve port, wherein an extending direction of the flow guiding cavity is consistent with an extending direction of a central axis of the valve port; as well as A first connecting pipe is arranged on the side wall of the valve body, and the first connecting pipe is provided with a first outlet connected to the valve cavity. The central axis of the first outlet does not intersect with the central axis of the valve cavity, so that the fluid flowing in from the first outlet can swirl in the valve cavity to the guide cavity.

2. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a valve needle disposed in the valve cavity, and the valve needle can axially extend into or move away from the valve port; The flow guide structure is sleeved on the outside of the valve needle and connected to the wall surface of the valve body where the valve port is arranged, so that the flow guide cavity is arranged around the periphery of the valve needle.

3. The electronic expansion valve according to claim 2, characterized in that: The cavity wall surface of the flow guide cavity is an arc surface, and the flow guide cavity is coaxially arranged with the valve needle; in the radial cross section of the flow guide structure, the flow guide cavity is in a circular ring shape.

4. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the flow-guiding structure is an arc surface, the cavity wall surface of the valve cavity is an arc surface, and the outer peripheral surface of the flow-guiding structure and the cavity wall surface of the valve cavity are coaxially arranged.

5. The electronic expansion valve according to claim 4, characterized in that: In the projection of the radial cross section of the valve body, the side wall of the first outlet away from the center of the valve cavity is tangent to the cavity wall surface of the valve cavity.

6. The electronic expansion valve according to claim 5, characterized in that: In the projection of the radial cross section of the valve body, the central axis of the first outlet is located outside the flow guide structure.

7. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The cavity wall of the guide cavity is provided with a first guide inclined surface at one end away from the valve port; And / or, a second guide slope is provided on the outer peripheral surface of the flow guide structure at one end away from the valve port.

8. The electronic expansion valve according to claim 2 or 3, 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 D1, satisfying: L≥0.5D1.

9. The electronic expansion valve according to any one of claims 1 to 3, 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 D1, satisfying: H≥D1.

10. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The inner diameter of the first outlet is defined as D2, and the inner diameter of the valve port is defined as D1, satisfying: D2 ≥ D1.

11. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The first connecting pipe is eccentrically arranged with respect to the valve cavity, and the first outlet is arranged at an axial end portion of the first connecting pipe.

12. The electronic expansion valve according to any one of claims 1 to 3, 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 The 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 arranged on the valve port seat; wherein the valve port seat and the valve seat are an integral structure or a split structure.

13. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 12.

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