Electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control, in particular to an electronic expansion valve which comprises a valve body 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 arranged at one end of the valve body along the axial direction of the valve body; a valve needle is arranged in the valve cavity and used for moving towards or away from the valve port in the axial direction of the valve needle. The first connecting pipe is arranged on the side wall of the valve body, a connecting hole communicated with the first connecting pipe is formed in the valve body, and a converging hole is formed in the bottom end of the connecting hole and communicated with the valve cavity. And the central axis of the afflux hole and the axis of the valve port are staggered in different planes. Fluid enters from the first connecting pipe, penetrates through the converging hole and then enters the valve cavity of the valve body in the tangential direction of the valve cavity, and the fluid tangentially flows through the extending direction of the valve port to form rotational flow in the valve cavity and then spirally flows to the valve port, so that the turbulent flow phenomenon of the fluid can be improved, the internal vortex of the spirally flowing fluid is reduced, and the service life of the valve is prolonged. The pressure pulsation in the valve port is reduced, so that the flowing noise of the fluid in the valve body is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control technical field especially relates to a kind of electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve is a control fluid flow component in refrigeration system, mainly plays throttling and regulating flow function.Electronic expansion valve is rotated by the magnetic rotor assembly of step motor controlled by pulse input power supply, and magnetic rotor assembly is rotated by screw thread transmission, so that the valve needle on rotor makes axial movement, thereby play the function of controlling the fluid flow size through valve.

[0003] Electronic expansion valve in prior art has liquid inlet connector of lateral inflow, the central axis of liquid inlet connector is orthogonal with the central axis of valve body, liquid inlet connector fluid flows into the valve cavity of electronic expansion valve, and then flows out from valve port, since fluid enters valve cavity is lateral flow, and is axial flow when entering valve port, and since electronic expansion valve internal valve cavity space is small, flow channel is relatively complex, local resistance and other influence superposition, cause each fluid micro-cluster uneven stress, make fluid form severe turbulent flow field in valve cavity, further cause fluid pressure pulsation larger in throttling process, cause larger flow noise. SUMMARY

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problem that electronic expansion valve flow noise is larger in prior art, the utility model provides a kind of electronic expansion valve to reduce the flow noise of electronic expansion valve.

[0005] The technical scheme that the utility model solves its technical problem is as follows: a kind of electronic expansion valve, including valve body, being equipped with valve cavity and the valve port being communicated with the valve cavity, the valve port is located at the one end of the valve body along its axial direction;Valve needle, being equipped in the valve cavity, is used for moving towards or away from the valve port along its axial direction;First connector, being equipped in the side wall of the valve body, the connecting hole being communicated with first connector is equipped on the valve body, the bottom end of the connecting hole is equipped with the induct hole, the induct hole is communicated with the valve cavity;The central axis of the induct hole is arranged in different planes with the axis of the valve port, so that the fluid in the first connector can swirl in the valve cavity after flowing out from the induct hole to the valve port.

[0006] A kind of electronic expansion valve of the utility model, in the projection in the plane perpendicular to the axis of valve body, the central axis of induct hole is located at one side of valve port, so that the fluid flowing out from induct hole can enter the valve cavity of valve body along the tangent direction of valve cavity, this part of fluid flows along the tangent direction of valve port extension direction and forms swirl in valve cavity, then spirally flows to valve port, so that the turbulent flow phenomenon of fluid can be improved, the internal vortex of spirally flowing fluid is reduced, the pressure pulsation in valve port is reduced, and then the flow noise of fluid in valve body is reduced.

[0007] Further, the center axis of the connecting hole is orthogonal to the center axis of the valve body.

[0008] Further, in a plane perpendicular to the direction of the valve body axis, the side of the inlet hole away from the valve port is tangent to the cavity wall surface of the valve cavity.

[0009] Further, the side of the inlet hole close to the valve port is orthogonal to the axial center line of the valve port at a distance greater than the radius size of the valve port.

[0010] Further, the projection of the inlet hole along its own axial direction is waist-shaped.

[0011] Further, the two ends of the projection of the inlet hole along its own axial direction are semicircular, and the two sides are two parallel edges, and the inlet hole is symmetrically arranged through the radial section of the connecting hole.

[0012] Further, in a plane perpendicular to the direction of the valve needle axis, the inlet hole is arranged in a staggered manner with the valve needle.

[0013] Further, the area of the inlet hole is greater than the area of the valve port.

[0014] Further, the projection of the inlet hole along its own axial direction is contained in the connecting hole.

[0015] Further, the first connecting pipe is welded to the valve body.

[0016] The beneficial effects of the utility model are,

[0017] 1. The valve needle is movably arranged in the valve cavity, can extend into or away from the valve port in the axial direction, realizes the function of adjusting the opening degree of the valve port, and further achieves the purpose of adjusting the flow; the first connecting pipe is arranged on the side wall of the valve body, the inlet hole connected with the first connecting pipe is improved, so that in the projection in the plane perpendicular to the valve body axis, the center axis of the inlet hole is located on one side of the valve port, so that the fluid flowing out of the inlet hole can enter the valve cavity in the tangential direction of the valve cavity, this part of the fluid flows in the tangential direction from the extension direction of the valve port to form a rotational flow in the valve cavity, and then spirally flows to the valve port, so that the turbulent flow phenomenon of the fluid can be improved, the internal vortex of the spirally flowing fluid is reduced, the pressure pulsation in the valve port is reduced, and further the flow noise of the fluid in the valve body is reduced.

[0018] 2. The projection of the inlet hole along its own axial direction is waist-shaped, without increasing the width of the inlet hole in the radial direction of the valve cavity, the cross-sectional area of the inlet hole is increased, without increasing the width of the inlet hole in the radial direction of the valve cavity, that is, without increasing the noise, and further the flow of the inlet hole is increased under the condition of smaller noise.

[0019] 3、By the setting that the area of the through path of the in-flow hole is larger than the area of the through path of the valve port, the output flow of the valve port can be guaranteed to meet the in-flow hole. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further explained in connection with the drawings and examples.

[0021] Figure 1 It is a front view cut structure schematic diagram of the whole electronic expansion valve in the utility model.

[0022] Figure 2 It is Figure 1 A-A part cut schematic diagram in the utility model.

[0023] Figure 3 It is a side view cut schematic diagram of the utility model with the first connecting pipe cut off.

[0024] Figure 4 It is a side view structure schematic diagram of the utility model reflecting the position of the connecting hole and the in-flow hole.

[0025] Figure 5 It is a partial schematic diagram of the utility model reflecting the position of the in-flow hole and the connecting hole.

[0026] Figure 6 It is Figure 5 B-B part cut schematic diagram in the utility model.

[0027] In the drawing: 1, valve body;11, first connecting pipe;12, second connecting pipe;13, valve cavity;14, valve port;15, valve needle;16, connecting hole;17, in-flow hole. DETAILED DESCRIPTION

[0028] The utility model will be further explained in connection with the drawings and examples. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so it only shows the relevant structure of the utility model.

[0029] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated necessarily having a particular orientation, being constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements.The specific meaning of the above terms in the utility model can be understood according to the specific circumstances by those skilled in the art.

[0030] The utility model discloses an electronic expansion valve.

[0031] Refer to Figures 1 to 6 An electronic expansion valve, including valve body 1, first connecting pipe 11 and second connecting pipe 12, be equipped with valve cavity 13 and with valve cavity 13 communication valve port 14 in valve body 1, valve port 14 is located in valve body 1 along the axial one end, second connecting pipe 12 is welded with valve body 1, and the inner hole of second connecting pipe 12 is communicated with valve port 14.Valve cavity 13 is equipped with valve needle 15, and valve needle 15 is used for moving along the axial direction of itself towards or away from valve port 14 to realize the function of adjusting the opening degree of valve port 14, to achieve the purpose of adjusting flow.The first connecting pipe 11 is welded on the side wall of the valve body 1, and the connecting hole 16 is provided on the valve body 1 and communicated with the first connecting pipe 11, the bottom end of the connecting hole 16 is provided with a converging hole 17, and the converging hole 17 is communicated with the valve cavity 13;The central axis of the converging hole 17 and the axis of the valve port 14 are arranged in different planes, that is, on the plane perpendicular to the axis of the valve port 14, the converging hole 17 is offset to one side of the valve cavity 13, so that the fluid in the first connecting pipe 11 flows out through the converging hole 17 and flows tangentially from the extension direction of the valve port 14 to form a rotational flow in the valve cavity 13, and then flows spirally to the valve port 14, thereby improving the turbulent flow phenomenon of the fluid, reducing the internal vortex of the spiral flow, reducing the pressure pulsation in the valve port 14, and further reducing the flow noise of the fluid in the valve body 1.

[0032] Specifically, the center axis of the connecting hole 16 is orthogonal to the center axis of the valve body 1 to adapt to the installation position outside.

[0033] Further, in the plane perpendicular to the axis direction of the valve body 1, the side of the inlet hole 17 away from the valve port 14 is tangent to the cavity wall surface of the valve cavity 13, and in the plane perpendicular to the axis direction of the valve needle 15, the inlet hole 17 is arranged in a staggered manner with the valve needle 15, so that the fluid flowing out of the inlet hole 17 can form a rotational flow in the valve cavity 13.

[0034] Further, the side of the inlet hole 17 close to the valve port 14 is orthogonal to the axial center line of the valve port 14 at a distance greater than the radius size of the valve port 14.

[0035] More specifically, in order to increase the cross-sectional area of the inlet hole 17 without increasing the width of the inlet hole 17 in the radial direction of the valve cavity 13, the projection of the inlet hole 17 along its own axial direction is in the shape of a waist. The projection of the inlet hole 17 along its own axial direction has two ends in the shape of a semicircle, and two sides in the shape of two parallel edges, and the length direction of the parallel edges is the same as the axis direction of the valve port 14. The inlet hole 17 is arranged symmetrically with respect to the radial cross section of the connecting hole 16, that is, the center axis of the inlet hole 17 along the axis direction of the valve port 14 and the axis of the connecting hole 16 are both located on a plane perpendicular to the axis of the valve port 14. The projection of the inlet hole 17 along its own axial direction is contained in the connecting hole 16, the flow area of the inlet hole 17 is greater than the flow area of the valve port 14, that is, the cross-sectional area of the connecting hole 16 is greater than the cross-sectional area of the inlet hole 17, and the cross-sectional area of the inlet hole 17 is greater than the cross-sectional area of the valve port 14.

[0036] Working principle: in operation, the fluid enters the connecting hole 16 from the first connecting pipe 11, then passes through the inlet hole 17 and enters the valve cavity 13, the fluid flowing out of the inlet hole 17 enters the valve cavity 13 of the valve body 1 along the tangent direction of the valve cavity 13 and forms a rotational flow in the valve cavity 13, and then flows spirally to the valve port 14, thereby improving the turbulent flow of the fluid, reducing the internal vortex of the spiral flow, reducing the pressure pulsation in the valve port 14, and further reducing the flow noise of the fluid in the valve body 1.

[0037] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of the claims.

Claims

1. An electronic expansion valve characterized by, The utility model relates to a valve body (1) is provided with valve cavity (13) and with valve port (14) intercommunication of valve cavity (13), valve port (14) is arranged in the valve body (1) along the axial one end of itself; Valve needle (15) is arranged in valve cavity (13) and is used for moving along the axial direction of itself to the valve port (14) or away from the valve port (14); First connecting pipe (11) is arranged in the lateral wall of valve body (1), and the valve body (1) is provided with connecting hole (16) intercommunication with first connecting pipe (11), and the bottom end of connecting hole (16) is provided with the inlets (17) that converge, and the inlets (17) are communicated with valve cavity (13); The central axis of the inlets (17) is arranged in the different plane with the axis of the valve port (14) to make the fluid in first connecting pipe (11) flow out through the inlets (17) and can swirl in valve cavity (13) to the valve port (14). The central axis of the connecting hole (16) is orthogonal with the central axis of the valve body (1).

2. An electronic expansion valve according to claim 1, characterized in that In the plane perpendicular to the axis direction of the valve body (1), the side of the inlets (17) away from the valve port (14) is tangent to the cavity wall surface of the valve cavity (13).

3. An electronic expansion valve according to claim 1, wherein The side of the inlets (17) close to the valve port (14) is orthogonal to the axial center line of the valve port (14) with the distance greater than the radius size of the valve port (14).

4. An electronic expansion valve according to claim 1, wherein The projection of the inlets (17) along the axial direction of itself is the waist shape.

5. An electronic expansion valve as claimed in claim 1, characterized in that The two ends of the projection of the inlets (17) along the axial direction of itself are semicircular, and the two sides are two parallel edges, and the inlets (17) are arranged symmetrically through the radial section of connecting hole (16).

6. An electronic expansion valve according to claim 5, wherein In the plane perpendicular to the axis direction of the valve needle (15), the inlets (17) are arranged in the different plane with the valve needle (15).

7. An electronic expansion valve as defined in claim 1, wherein The through diameter area of the inlets (17) is greater than the through diameter area of the valve port (14).

8. An electronic expansion valve as defined in claim 1, wherein The projection of the inlets (17) along the axial direction of itself is contained in the connecting hole (16).

9. An electronic expansion valve as defined in claim 1, wherein The first connecting pipe (11) is welded with the valve body (1).

10. An electronic expansion valve as claimed in claim 1, characterized in that ​

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