CN215215020U - Electronic expansion valve and refrigeration equipment - Google Patents

Abstract

The utility model discloses an electronic expansion valve and refrigeration plant, wherein, electronic expansion valve, include: a valve housing provided with a valve cavity; the first pipe body is arranged on the valve shell, and the valve shell is provided with a valve port communicated with the first pipe body and the valve cavity; the second pipe body is arranged on the valve shell and communicated with the valve cavity; the nut is arranged in the valve shell, and the valve cavity is formed between one side of the nut, which faces the valve port, and the inner wall of the valve shell; the valve rod is movably arranged in the nut in a penetrating mode, and one end of the valve rod is integrally provided with a valve needle used for adjusting the opening degree of the valve port; the second pipe body is communicated with the valve cavity from the side wall of the valve shell, a flow guide surface arranged towards the second pipe body is formed on the nut, and the flow guide surface is used for guiding fluid flowing between the second pipe body and the valve port. The utility model discloses can reduce electronic expansion valve's running noise.

Description

Electronic expansion valve and refrigeration equipment

Technical Field

The utility model relates to a domestic appliance field, in particular to electronic expansion valve and refrigeration plant.

Background

The electronic expansion valve is widely used in refrigeration equipment, and utilizes an electric signal generated by an adjusted parameter to control the voltage or current applied to the electronic expansion valve, so as to achieve the effect of changing the opening degree of a valve port and further adjust the liquid supply amount. The electronic expansion valve is provided with a valve needle for regulating the flow of fluid, and the position of the valve needle can be regulated, so that when fluid impacts the valve needle, the valve needle is easily subjected to the action force of the fluid to generate vibration, and vibration noise is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic expansion valve and refrigeration plant, the valve rod that aims at solving current electronic expansion valve produces the problem that the vibration leads to the noise.

In order to achieve the above object, the present invention provides an electronic expansion valve, including:

a valve housing provided with a valve cavity;

the first pipe body is arranged on the valve shell, and the valve shell is provided with a valve port communicated with the first pipe body and the valve cavity;

the second pipe body is arranged on the valve shell and communicated with the valve cavity;

the nut is arranged in the valve shell, and the valve cavity is formed between one side of the nut, which faces the valve port, and the inner wall of the valve shell; and

the valve rod is movably arranged in the nut in a penetrating mode, and one end of the valve rod is integrally provided with a valve needle used for adjusting the opening degree of the valve port;

the second pipe body is communicated with the valve cavity from the side wall of the valve shell, a flow guide surface arranged towards the second pipe body is formed on the nut, and the flow guide surface is used for guiding fluid flowing between the second pipe body and the valve port.

Optionally, the flow guide surface is an arc surface or an inclined surface.

Optionally, the flow guide surface is an arc surface which is concavely arranged towards the axis direction of the nut.

Optionally, the flow guide surface is annularly arranged along the circumferential direction of the nut.

Optionally, the electronic expansion valve further comprises:

the connecting piece is arranged in the valve shell, and the nut is connected with the valve shell through the connecting piece.

Optionally, the valve cavity is formed between one side of the nut facing the valve port and the inner wall surface of the valve housing, and a pressure reduction cavity is formed between one side of the nut facing away from the valve port and the inner wall of the valve housing;

and the nut and/or the connecting piece are/is provided with a pressure reducing hole for communicating the pressure reducing cavity and the valve cavity.

Optionally, the nut has an internal thread section and a first through bore section; the valve rod is provided with an external thread section at least partially in threaded connection with the internal thread section, and a first cylindrical section at least partially inserted into the first through hole section;

the outer diameter of the first cylindrical section is larger than that of the external thread section.

Optionally, the nut has an internal thread section and a second through bore section; the valve rod is provided with an external thread section at least partially in threaded connection with the internal thread section, and a second cylindrical section at least partially inserted into the second through hole section;

the inner diameter of the second through hole section is smaller than that of the internal thread section.

Optionally, the electronic expansion valve further comprises:

the driving assembly is arranged on the valve shell, the valve rod is provided with a top end far away from the valve needle, and the top end of the valve rod is connected with the driving assembly, so that the driving assembly drives the valve rod to move along the axial direction.

The utility model also provides a refrigeration plant, include as above-mentioned arbitrary electronic expansion valve.

The utility model discloses technical scheme carries out the water conservancy diversion in the fluid that flows between second body and the valve port through the water conservancy diversion face that adopts towards the setting of second body, reduces the produced impact to the valve rod when fluid flows to the valve rod to can reduce the vortex of valve rod and nut department, and then can reduce the vibration noise of valve rod.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of an internal structure of an electronic expansion valve according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural diagram of another embodiment of the internal structure of the electronic expansion valve of the present invention;

FIG. 4 is a partial enlarged view of the portion B in FIG. 3;

fig. 5 is a schematic structural view of an embodiment of the valve stem of the present invention;

fig. 6 is a schematic structural view of an embodiment of the nut of the present invention;

fig. 7 is a schematic structural view of another embodiment of the nut of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Valve housing	11	Valve seat
12	Shell body	13	A first pipe body
				14	Second tube	15	Valve port
16	Valve cavity	17	Decompression chamber
				20	Nut	21	First through hole section
22	Internal thread section	23	Second through hole section
				24	Flow guide surface	25	Sliding rail
30	Valve rod	31	Valve needle
				32	Tip end	33	A first cylindrical section
34	External thread section	35	Second cylindrical section
				40	Drive assembly	41	Limiting plate
42	Limiting rod	43	Slip ring
				44	Rotating module	50	Connecting sheet
51	Pressure relief vent

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an electronic expansion valve, electronic expansion valve can be used for refrigeration plant, also can be used to other needs to carry out the equipment controlled to fluid flow. For convenience of description, the electronic expansion valve is used in a refrigerator, and the electronic expansion valve is used to control the liquid flow. Fig. 1 to 7 are corresponding drawings of the embodiment of the present invention.

Referring to fig. 1 and 2, in an embodiment, the electronic expansion valve includes:

a valve housing 10, said valve housing 10 being provided with a valve chamber 16; the valve housing 10 internally forms a valve chamber 16 for containing a fluid. The valve housing 10 may include a valve seat 11 and a housing 12, the housing 12 and the valve seat 11 cooperating to form a hollow chamber.

A first pipe 13 disposed in the valve housing 10, wherein the valve housing 10 is provided with a valve port 15 communicating the first pipe 13 and the valve chamber 16; the valve port 15 may be disposed on the valve seat 11, and the axial direction of the first tube 13 may be parallel to the axial direction of the valve housing 10, so that liquid can flow between the valve chamber 16 and the first tube 13 through the valve port 15.

A second tube 14 disposed in the valve housing 10 and communicating with the valve chamber 16; the second tube 14 communicates with the valve chamber 16 so that liquid can enter the valve chamber 16 through the second tube 14 and enter the first tube 13 through the valve port 15, or follow the reverse path.

The nut 20 is installed in the valve housing 10, and the diversion surface 24 is arranged on one side of the nut 20 close to the valve port 15; the nut 20 is formed with a through hole, the through hole portion of the nut 20 is formed with an internal thread section 22, and the nut 20 and the inner wall of the valve housing 10 are fixedly connected to each other.

A valve rod 30 rotatably disposed through the nut 20, and the valve needle 31 is disposed at one end of the valve rod 30 facing the valve port 15. The valve needle 31 is integrally provided with the valve stem 30, the valve stem 30 is adapted to be engaged with the nut 20, and the valve stem 30 has an external thread section 34, and when the valve stem 30 is inserted into the nut 20, the external thread section 34 of the valve stem 30 can be threadedly coupled with the internal thread section 22 of the nut 20 to enable the valve stem 30 to move in the axial direction. The valve needle 31 is disposed at one end of the valve rod 30, and when the valve rod 30 moves in the axial direction, the relative position of the valve needle 31 and the valve port 15 can be changed, so that the valve needle 31 can be used for adjusting the opening degree of the valve port 15.

Referring to fig. 1 and 3, when the valve needle 31 is inserted into the valve port 15 and the valve port 15 is closed, the electronic expansion valve cannot achieve liquid flow; when the valve needle 31 is removed from the valve port 15, the valve port 15 is fully opened. When the valve needle 31 is partially located in the valve port 15, the opening degree of the valve port 15 can be changed by adjusting the relative position of the valve needle 31, so as to realize the flow rate of the liquid flowing through the valve port 15. The valve chamber 16 is enclosed by the nut 20 and the inner wall of the valve housing 10. The valve chamber 16 is used to form a cavity for fluid flow between the first pipe body 13 and the second pipe body 14.

The second tube 14 is communicated with the valve cavity 16 from the side wall of the valve housing 10, so that the axial direction of one end of the second tube 14 communicated with the valve cavity 16 forms an included angle with the axial direction of the valve housing 10, the nut 20 is formed with a flow guide surface 24 disposed toward the second tube 14, and the flow guide surface 24 is used for guiding the fluid flowing between the second tube 14 and the valve port 15. When the nut 20 is installed in the valve housing 10, the relative position of the nut 20 in the valve housing 10 is determined, and only the valve needle 31 can be adjusted in relative position. The nut 20 may be formed with a slope or a curve toward the second tube 14 for guiding the liquid.

Referring to fig. 5, 6 and 7, the valve rod 30 has two opposite ends, one end of which forms the valve needle 31 and the other end of which forms the top end 32, wherein when the valve rod 30 is inserted into the nut 20 from the through hole on the nut 20, the external thread section 34 on the valve rod 30 cooperates with the internal thread section 22 on the nut 20 to limit the position of the valve rod 30, and the position of the valve needle 31 is adjusted by moving the position of the valve rod 30.

By integrally forming the valve needle 31 and the valve rod 30, the valve rod 30 can be conveniently integrally formed, and when the valve rod 30 moves along the axial direction thereof, the movement track of the valve needle 31 is relatively constant, so that the opening degree of the valve port 15 can be more accurately adjusted. By integrating the valve needle 31 with the valve stem 30, the nut 20 can function to support the valve stem 30 when the valve stem 30 and the nut 20 are engaged with each other, and the stability of the valve stem 30 is relatively higher, so that the vibration generated when it is impacted by the liquid is relatively smaller, thereby contributing to the reduction of the vibration noise.

The flow guide surface 24 is disposed on the nut 20, as shown in fig. 6, the flow guide surface 24 is a concave arc surface, and the flow guide surface 24 is disposed annularly along the circumference of the nut 20. The valve cavity 16 is formed between the outer surface of the nut 20 on the side facing the valve seat 11 and the valve seat 11.

As shown in fig. 7, the flow guide surface 24 is an inclined surface, and the flow guide surface 24 is annularly disposed along the circumferential direction of the nut 20. The side of the nut 20 facing the valve seat 11 is formed into a generally conical structure to guide the liquid.

By arranging the flow guide surface 24, no matter the first pipe body 13 is used as an input pipe, the second pipe body 14 is used as an output pipe, or the first pipe body 13 is used as an output pipe, the second pipe body 14 is used as an input pipe, when liquid enters the valve cavity 16, a good flow guide effect can be achieved, so that a vortex is prevented from being generated in the liquid flowing process, and the noise in the valve cavity 16 is reduced; through carrying out the water conservancy diversion to liquid, reduce the impact of liquid to valve rod 30, avoid valve rod 30 to produce the vibration, and then reduce the vibration noise of valve rod 30.

Taking the second tube 14 as an input tube and the first tube 13 as an output tube as an example, after the liquid enters the valve cavity 16 from the second tube 14, a part of the liquid flows toward the valve port 15, and a part of the liquid flows toward the nut 20 and the valve stem, wherein the liquid flowing toward the nut 20 flows toward the valve port 15 under the guiding action of the guiding surface 24. Because water conservancy diversion face 24 can realize carrying out the water conservancy diversion to liquid for when liquid flows to nut 20, be difficult to appear acutely turning to, and then avoid liquid to produce the vortex when flowing to nut 20, and then can reduce the noise. By reducing the turbulence, it is possible to help increase the flow of liquid between the second body 14 and the valve port 15.

The second tube 14 has a first end for connecting the valve housing 10 and a second end far from the first end, and an axial direction of the first end of the second tube 14 is disposed at an angle to an axial direction of the valve port 15, so that when liquid enters the valve chamber 16 from the second tube 14, an impact is generated on the nut 20, especially the valve needle 31. Since the valve needle 31 is required to adjust the opening degree of the valve port 15, the valve needle 31 is a movable structure. When liquid flows to the nut 20, the liquid can be guided along the guide surface 24, so that the liquid can be smoothly guided and transited between the valve port 15 and the second pipe 14, the liquid does not cause large impact on the nut 20, and vibration of the valve needle 31 caused by the liquid impact can be reduced, which is helpful for reducing vibration noise of the nut 20.

Referring to fig. 1 and fig. 2, in an embodiment, the flow guiding surface 24 is an arc surface, and the flow guiding surface 24 may be a concave arc surface that is concave toward the axial direction of the nut 20, or a convex arc surface that is convex toward the second tube 14. In order to increase the volume of the valve cavity 16, the flow guide surface 24 is optionally provided with a concave arc surface.

Referring to fig. 3 and 4, in another embodiment, the flow guiding surface 24 is a slope to reduce noise generated when the liquid flows between the second pipe 14 and the valve port 15.

The diversion surface 24 may be disposed on only one side surface of the nut 20 facing the second tube 14, and when the second tube 14 is used as an input tube and the first tube 13 is used as an output tube, the diversion effect on the liquid input from the second tube 14 is relatively better.

In another embodiment, the deflector surface 24 is disposed annularly along the circumference of the nut 20. One end of the nut 20 close to the valve seat 11 forms a valve cavity 16 for containing liquid, and the flow guide surface 24 has a better flow guide effect. When the first pipe 13 is used as an input pipe and the second pipe 14 is used as an output pipe, and when liquid sequentially enters the valve cavity 16 through the first pipe 13 and the valve port 15, the annularly arranged flow guide surface 24 can gradually guide the liquid to the direction of the second pipe 14, so as to form a surface for guiding the liquid in the valve shell 10, so that the liquid is not easy to generate a vortex when flowing to the second pipe 14, thereby reducing fluid resistance and improving liquid flow. Because the opening of the valve port 15 is adjustable, the annularly arranged flow guide surface 24 can uniformly guide the flow of the liquid, so that the flow of the liquid is more stable, and the noise caused by vortex is reduced.

In order to facilitate fixing when the nut 20 is installed, optionally, the electronic expansion valve further includes a connecting piece 50, the connecting piece 50 is disposed in the valve housing 10, and the nut 20 is connected to the valve housing 10 through the connecting piece 50. The outer periphery of the connecting piece 50 may be connected to the valve seat 11, and the inner periphery of the connecting piece 50 is connected to the outer wall of the nut 20, so as to fix the nut 20. The outer periphery of the connecting piece 50 may be connected to the valve seat 11 by laser welding or the like. The inner periphery of the connecting piece 50 can be clamped with the nut 20, and the connecting piece 50 can also be connected and fixed with the nut 20 in a laser welding mode. Other processes may be selected for the fastening depending on the material of the nut 20 and the valve housing 10.

Referring to fig. 1 and 3, in an embodiment, a decompression chamber 17 is further formed in the valve housing 10, and the decompression chamber 17 is formed on a side of the nut 20 away from the valve port 15; the valve cavity 16 is formed between the side of the nut 20 facing the valve port 15 and the inner wall of the valve housing 10, and the nut 20 and/or the connecting piece 50 are provided with pressure reducing holes 51 communicating the pressure reducing cavity 17 and the valve cavity 16. Taking the connecting sheet 50 provided with the pressure reducing hole 51 as an example, the pressure reducing hole 51 is communicated with the valve cavity 16 and the pressure reducing cavity 17 to reduce the internal pressure of the valve cavity 16, and the pressure difference between the pressure reducing cavity 17 and the valve cavity 16 is balanced through the pressure reducing hole 51, so that the stability of the valve rod 30 can be further improved, and the valve rod 30 is prevented from generating vibration.

When the outer periphery of the nut 20 is connected to the inner wall of the valve housing 10, the pressure reducing hole 51 is formed through the nut 20 and the connecting piece 50, so that the pressure reducing hole 51 communicates the valve chamber 16 and the pressure reducing chamber 17. When there is a gap between the nut 20 and the inner wall of the valve housing 10, the connecting piece 50 may be used to connect the valve housing 10 and the nut 20 while isolating the valve chamber 16 and the pressure reducing chamber 17, and the pressure reducing hole 51 is provided on the connecting piece 50.

In order to improve the stability of the nut 20, optionally, the side of the nut 20 facing the valve port 15 is formed with the flow guiding surface 24, the flow guiding surface 24 has a first side close to the valve port 15 and a second side far from the valve port 15, the nut 20 is further formed with a planar section having an inner periphery and an outer periphery, wherein the inner periphery of the planar section is connected to the second side of the flow guiding surface 24, the outer periphery of the planar section extends to the inner wall of the valve housing 10, the planar section is a surface arranged along the radial direction of the nut 20, one end of the pressure reducing hole 51 is communicated with the pressure reducing chamber 17, and the other end thereof extends to the planar section and is communicated with the valve chamber 16. The flat section is located on a side of the second tube 14 away from the valve port 15 to avoid blocking liquid. Taking the second tube 14 as an input tube and the first tube 13 as an output tube as an example, when liquid flows between the second tube 14 and the valve port 15, the flow guide surface 24 can guide part of the liquid to the valve port 15, and part of the liquid can flow to the pressure reduction hole 51 to reduce the flow rate of the liquid flowing to the valve port 15, and the liquid is divided by the pressure reduction hole 51, so that the liquid input from the second tube 14 to the valve cavity 16 does not generate a vortex, and vibration caused by impact on the valve rod 30 is avoided.

Referring to fig. 5, 6 and 7, in one embodiment, the nut 20 has an internal thread section 22 and a first through hole section 21; the valve rod 30 is provided with an external thread section 34 at least partially connected with the internal thread section 22 in a threaded mode, and a first cylindrical section 33 at least partially inserted into the first through hole section 21; the external threaded section 34 of the valve stem 30 is located between the first cylindrical section 33 and the valve needle 31.

The outer diameter of the first cylindrical section 33 is larger than the outer diameter of the external threaded section 34; the inner diameter of the first through hole section 21 is larger than the inner diameter of the internal thread section 22. When the valve rod 30 is installed, the valve needle 31 is first inserted into the first through-hole section 21, the external thread section 34 of the valve needle 31 and the internal thread section 22 of the nut 20 are screwed together, the valve rod 30 is further screwed, and the first cylindrical section 33 is inserted into the first through-hole section 21. When the first cylindrical section 33 moves to the internal thread section 22, since the outer diameter of the first cylindrical section 33 is larger than the outer diameter of the external thread section 34, the outer diameter of the first cylindrical section 33 is larger than the inner diameter of the internal thread section 22, so that the first cylindrical section 33 cannot move further toward the valve port 15, thereby limiting the maximum moving distance of the valve rod 30.

When the first cylindrical section 33 moves to the internal thread section 22 of the nut 20, the internal thread section 22 limits the movement of the valve rod 30, and the valve needle 31 can be inserted into the valve port 15 to close the valve port 15. By limiting the maximum travel distance of the valve stem 30, the position of the valve needle 31 can be conveniently controlled.

With continued reference to fig. 5, 6 and 7, in one embodiment, the nut 20 has an internal thread segment 22 and a second through-hole segment 23; the valve rod 30 is provided with an external thread section 34 at least partially connected with the internal thread section 22 in a threaded mode, and a second cylindrical section 35 at least partially inserted into the second through hole section 23; the external threaded section 34 may be disposed between the first cylindrical section 33 and the second cylindrical section 35, and the valve needle 31 is disposed on a side of the second cylindrical section 35 away from the external threaded section 34.

The inner diameter of the second through hole section 23 is smaller than the inner diameter of the internal thread section 22, the internal thread section 22 of the nut 20 is matched with the external thread section 34 of the valve rod 30, the second cylindrical section 35 can be inserted into the second through hole section 23, and the outer diameter of the second cylindrical section 35 is smaller than the outer diameter of the external thread section 34; when the external thread section 34 and the internal thread section 22 are connected with each other by screw threads, and the external thread section 34 moves to the second through hole section 23, the second through hole section 23 can block the external thread section 34 from moving further into the second through hole section 23, thereby limiting the maximum moving range of the valve rod 30.

The inner diameter of the internal thread section 22 refers to the smallest inner circumferential diameter of the internal thread section 22, and the outer diameter of the external thread section 34 refers to the largest outer circumferential diameter of the external thread section 34. The first cylindrical section 33 is matched with the first through hole section 21, and the second cylindrical section 35 is matched with the second through hole section 23, so that the position of the valve rod 30 can be limited, and meanwhile, the valve rod 30 can be limited when the valve needle 31 closes the valve port 15 by fixing the external thread section 34 and the internal thread section 22 with each other.

Referring to fig. 1 and 3, in order to facilitate driving the valve rod 30 to move, in an embodiment, the electronic expansion valve further includes a driving assembly 40, the driving assembly 40 is disposed on the valve housing 10, the valve rod 30 has a top end 32 far away from the valve needle 31, and the top end 32 of the valve rod 30 is connected to the driving assembly 40, so that the driving assembly 40 drives the valve rod 30 to move axially. The driving assembly 40 is used for driving the valve rod 30 to move axially, so as to adjust the opening degree of the valve port 15 by adjusting the position of the valve needle 31. Since the valve stem 30 and the nut 20 can rotate with each other, the driving assembly 40 can drive the valve stem 30 to move axially.

In an embodiment, the driving assembly 40 includes a rotating module 44 and a retainer plate 41, the rotating module 44 is rotatably disposed in the valve housing 10, and an outer periphery of an end of the nut 20 away from the valve port 15 may have a clearance with an inner wall of the housing 12 to mount the rotating module 44. The rotary module 44 can rotate relative to the valve housing 10. The limiting plate 41 is connected to the top end 32 of the valve rod 30, and when the rotating module 44 rotates, the limiting plate 41 rotates synchronously and drives the valve rod 30 to rotate relatively, so as to drive the valve rod 30 to rotate relatively to the nut 20.

In order to improve the stability of the valve rod 30, optionally, a sliding rail 25 may be disposed on an outer wall of the nut 20, a limiting rod 42 is disposed on the limiting plate 41, the limiting rod 42 extends from the limiting plate 41 to a direction close to the valve port 15, a sliding ring 43 is disposed on the limiting rod 42, the sliding ring 43 is in sliding fit with the sliding rail 25, when the rotating module 44 rotates, the limiting plate 41 and the limiting rod 42 rotate synchronously, the sliding ring 43 rotates synchronously along a track formed by the sliding rail 25, and the valve rod 30 rotates relative to the nut 20 under the driving of the limiting plate 41 to adjust the position of the valve rod 30. When the valve rod 30 is formed with the first cylindrical section 33 and/or the second cylindrical section 35, the first cylindrical section 33 and/or the second cylindrical section 35 may be used to limit the maximum moving range of the valve rod 30 when moving toward the valve port 15.

The utility model discloses on above-mentioned electronic expansion valve's basis, still provide a refrigeration plant's embodiment, refrigeration plant includes as above-mentioned arbitrary embodiment electronic expansion valve. The refrigeration equipment can be equipment with a refrigeration function, such as a refrigerator, an air conditioner and the like.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims (10)

1. An electronic expansion valve, comprising:

a valve housing provided with a valve cavity;

the first pipe body is arranged on the valve shell, and the valve shell is provided with a valve port communicated with the first pipe body and the valve cavity;

the second pipe body is arranged on the valve shell and communicated with the valve cavity;

the nut is arranged in the valve shell, and the valve cavity is formed between one side of the nut, which faces the valve port, and the inner wall of the valve shell; and

the valve rod is movably arranged in the nut in a penetrating mode, and one end of the valve rod is integrally provided with a valve needle used for adjusting the opening degree of the valve port;

the second pipe body is communicated with the valve cavity from the side wall of the valve shell, a flow guide surface arranged towards the second pipe body is formed on the nut, and the flow guide surface is used for guiding fluid flowing between the second pipe body and the valve port.

2. The electronic expansion valve of claim 1, wherein the flow guide surface is an arc surface or an inclined surface.

3. The electronic expansion valve of claim 2, wherein the flow guide surface is a curved surface recessed toward the axial direction of the nut.

4. The electronic expansion valve of claim 2, wherein the flow-guiding surface is annularly disposed along a circumferential direction of the nut.

5. An electronic expansion valve according to any of claims 1-4, further comprising:

the connecting piece is arranged in the valve shell, and the nut is connected with the valve shell through the connecting piece.

6. The electronic expansion valve according to claim 5, wherein a decompression chamber is formed between a side of the nut facing away from the valve port and an inner wall of the valve housing;

and the nut and/or the connecting piece are/is provided with a pressure reducing hole for communicating the pressure reducing cavity and the valve cavity.

7. The electronic expansion valve according to any of claims 1 to 4, wherein the nut has an internal thread section and a first through-hole section; the valve rod is provided with an external thread section at least partially in threaded connection with the internal thread section, and a first cylindrical section at least partially inserted into the first through hole section;

the outer diameter of the first cylindrical section is larger than that of the external thread section.

8. The electronic expansion valve according to any of claims 1 to 4, wherein the nut has an internal thread section and a second through-hole section; the valve rod is provided with an external thread section at least partially in threaded connection with the internal thread section, and a second cylindrical section at least partially inserted into the second through hole section;

the inner diameter of the second through hole section is smaller than that of the internal thread section.

9. An electronic expansion valve according to any of claims 1-4, further comprising:

the driving assembly is arranged on the valve shell, the valve rod is provided with a top end far away from the valve needle, and the top end of the valve rod is connected with the driving assembly, so that the driving assembly drives the valve rod to move along the axial direction.

10. Refrigeration appliance, comprising an electronic expansion valve according to any of claims 1 to 9.

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