CN217927233U

CN217927233U - Electronic expansion valve and refrigeration equipment

Info

Publication number: CN217927233U
Application number: CN202221963652.1U
Authority: CN
Inventors: 杨茂; 任纬峰; 李关龙
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-11-29
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses an electronic expansion valve and refrigeration plant, wherein, the electronic expansion valve includes valve seat, connecting seat, uide bushing, valve port seat and needle subassembly; the valve seat is provided with a valve cavity; the connecting seat and the guide sleeve are arranged in the valve cavity, and the guide sleeve is connected with the connecting seat; the valve port seat is provided with a valve port and is in sealing connection with the guide sleeve; the valve needle assembly comprises a valve rod and a valve head, and the valve head is used for opening or closing the valve port; wherein the hardness of the valve port seat is less than the hardness of the valve head. The utility model discloses an electronic expansion valve can solve the internal leakage problem when electronic expansion valve uses.

Description

Electronic expansion valve and refrigeration equipment

Technical Field

The utility model relates to a fluid control part technical field, in particular to electronic expansion valve and refrigeration plant.

Background

The electronic expansion valve is an important part in a refrigeration system and mainly plays a role in throttling and reducing pressure and regulating flow. In the related technology, the electronic expansion valve comprises a valve seat assembly, a nut assembly, a valve needle assembly, a magnetic rotor assembly and other components, wherein a valve port is formed in the valve seat assembly, when the electronic expansion valve works, the magnetic rotor assembly is driven to rotate through an electrified coil surrounding the outside of the valve shell, so that the valve needle assembly is driven to axially move, the valve port is further controlled to be opened or closed, and the effects of throttling, pressure reducing and flow rate adjusting are achieved.

When the electronic expansion valve is used for an air conditioning system of an automobile, the valve body and the valve seat of the electronic expansion valve are usually arranged separately due to the requirement of convenience in assembly of the automobile system, however, the inner leakage performance of the electronic expansion valve is seriously deteriorated due to the arrangement, and the inner leakage requirement of a product cannot be met due to the adoption of a common valve head and valve port hard seal design.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic expansion valve aims at solving the internal leakage problem when electronic expansion valve uses.

In order to achieve the above object, the present invention provides an electronic expansion valve, which comprises a valve seat, a connecting seat, a guide sleeve, a valve seat and a valve needle assembly; a port is formed at one end of the valve seat, and a valve cavity communicated with the port is formed in the valve seat; the connecting seat is arranged at the port; the guide sleeve is arranged in the valve cavity and connected with the connecting seat, and the guide sleeve and the connecting seat are integrally formed or are arranged in a split mode; the valve port seat is provided with a valve port and is in sealing connection with the guide sleeve, the inner wall of the valve port forms a flow regulating surface, and the flow regulating surface extends downwards; the valve needle assembly is movably arranged on the guide sleeve and comprises a valve rod and a valve head connected with the valve rod, the valve head is movably inserted into the valve port, and the valve rod can reciprocate along the axial direction of the valve port to drive the valve head to open or close the valve port; wherein the valve port seat has a hardness less than the valve head.

In one embodiment, the valve seat is made of a non-metal material.

In an embodiment, the electronic expansion valve further includes a sealing structure, the sealing structure is located between an inner wall surface of the guide sleeve and an outer wall surface of the valve seat, and the guide sleeve and the valve seat are hermetically connected through the sealing structure.

In an embodiment, the sealing structure includes a plurality of ribs disposed on an outer wall surface of the valve seat, the inner wall surface of the guide sleeve is provided with a plurality of limiting grooves, and the ribs are disposed in the limiting grooves.

In an embodiment, the sealing structure includes a first sealing element, an outer wall surface of the valve port seat is provided with a first groove, and the first sealing element is arranged in the first groove and is abutted against an inner wall surface of the guide sleeve; or the inner wall surface of the guide sleeve is provided with a first groove, and the first sealing element is arranged in the first groove and is abutted against the outer wall surface of the valve port seat.

In an embodiment, the electronic expansion valve further includes a gasket, and the gasket is connected to the guide sleeve and abuts against the lower end of the valve port seat.

In one embodiment, the spacer is riveted to the guide sleeve.

In one embodiment, the lower end of the guide sleeve is provided with a riveting part in a downward protruding manner, and the riveting part is abutted to the lower end face of the gasket through self deformation.

In one embodiment, the gasket is made of metal, and the gasket is welded with the guide sleeve.

In one embodiment, the outer wall surface of the guide sleeve is provided with a second groove, a second sealing element is arranged in the second groove, and the second sealing element is abutted against the inner wall surface of the valve seat.

In one embodiment, the diameter of the lower end of the flow regulating surface is smaller than the diameter of the upper end of the flow regulating surface.

In an embodiment, the electronic expansion valve further includes a nut component and a rotor component, the nut component is in threaded connection with the valve needle component, and the rotor component is sleeved on the valve needle component and can drive the valve needle component to rotate relative to the nut component, so that the valve rod reciprocates along an axial direction of the valve port to drive the valve head to open or close the valve port.

In an embodiment, the electronic expansion valve further includes a valve housing, the valve housing is a cylindrical structure with an opening at one end, and the valve housing is connected to the connecting seat and covers the valve needle assembly, the nut assembly and the rotor assembly.

The utility model discloses still provide a refrigeration plant, refrigeration plant includes electronic expansion valve. The electronic expansion valve comprises a valve seat, a connecting seat, a guide sleeve and a valve port seat; a port is formed at one end of the valve seat, and a valve cavity communicated with the port is formed in the valve seat; the connecting seat is arranged at the port; the guide sleeve is arranged in the valve cavity and connected with the connecting seat; the valve port seat is provided with a valve port and is in sealing connection with the guide sleeve, the inner wall of the valve port forms a flow regulating surface, and the flow regulating surface extends downwards; wherein the valve port seat has a hardness less than the guide sleeve.

In one embodiment, the refrigeration appliance is an air conditioner, a freezer, a refrigerator, or a heat pump water heater.

The electronic expansion valve of the utility model comprises a valve seat, a connecting seat, a guide sleeve, a valve port seat and a valve needle component; a port is formed at one end of the valve seat, and a valve cavity communicated with the port is formed in the valve seat; the connecting seat is arranged at the port; the guide sleeve is arranged in the valve cavity and connected with the connecting seat, and the guide sleeve and the connecting seat are integrally formed or are arranged in a split mode; the valve port seat is provided with a valve port and is in sealing connection with the guide sleeve, the inner wall of the valve port forms a flow regulating surface, and the flow regulating surface extends downwards; the valve needle assembly is movably arranged on the guide sleeve and comprises a valve rod and a valve head connected with the valve rod, the valve head is movably inserted into the valve port, and the valve rod can reciprocate along the axial direction of the valve port to drive the valve head to open or close the valve port; wherein the hardness of the valve port seat is less than the hardness of the valve head. Therefore, the valve port seat is connected with the guide sleeve in a sealing mode, when the valve port is closed by the valve head, fluid media can be prevented from flowing out of a gap between the valve port seat and the valve head, and the problem of internal leakage when the electronic expansion valve is used is solved.

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 view of an embodiment of an electronic expansion valve according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a schematic view of the valve seat of the electronic expansion valve of FIG. 1;

fig. 4 is an exploded view of a portion of the structure of the electronic expansion valve of fig. 1;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is a schematic structural diagram of a portion of the electronic expansion valve in fig. 1.

The reference numbers indicate:

reference numerals	Name(s)	Reference numerals	Name (R)
				10	Electronic expansion valve	410	Valve port
100	Valve seat	411	Flow regulating surface
				110	Port(s)	500	Sealing structure
120	Valve cavity	510	Convex rib
				130	First interface	520	Second seal
140	Second interface	600	Gasket
				200	Connecting seat	700	Valve needle assembly
300	Guide sleeve	710	Valve rod
				310	Riveting part	720	Valve head
320	Second groove	800	Nut assembly
				330	Medium circulation chamber	900	Rotor assembly
340	Mounting port	1000	Valve housing
				400	Valve seat

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 of the present invention, all other embodiments obtained by a person skilled in the art without making 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 drawing), and if the specific posture is changed, the directional indication is 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 of the feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "a and/or B" as an example, including either the a aspect, or the B aspect, or both the a and B aspects. 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's embodiment, electronic expansion valve is an important part among the refrigerating system, mainly plays the effect of throttle step-down and regulation flow. The existing electronic expansion valve comprises a valve seat, a nut component and a valve needle component in threaded fit with the nut component, wherein the valve needle component is driven by a magnetic rotor component to generate axial movement, and the opening degree of a valve port is adjusted, so that the circulation control of a medium is realized. The utility model discloses an electronic expansion valve adopts the soft seal design with valve head and valve port to prevent that fluid medium from flowing from the gap between valve head and the valve port, internal leakage when reducing electronic expansion valve and using.

The utility model discloses an electronic expansion valve can use in the air conditioning system of car, and the fluid medium that flows through electronic expansion valve is the refrigerant that is used for carrying out the cold and heat exchange among the air conditioning system. At this time, the electronic expansion valve is installed at the inlet of the evaporator of the air conditioning system, and the electronic expansion valve is used as a boundary element between the high-pressure side and the low-pressure side of the air conditioning system, so that the high-pressure liquid refrigerant from the liquid storage drier and other devices is throttled and depressurized, the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of the external refrigeration load. Alternatively, the electronic expansion valve is applied to other types of refrigeration equipment, the fluid medium flowing through the electronic expansion valve may also be other fluid media except for the refrigerant, as long as the electronic expansion valve can throttle and depressurize the fluid medium, which is not particularly limited.

Referring to fig. 1 to 6, in an embodiment of the present invention, the electronic expansion valve 10 includes a valve seat 100, a connecting seat 200, a guide sleeve 300, a valve seat 400 and a valve needle assembly 700; a port 110 is formed at one end of the valve seat 100, and a valve cavity 120 communicated with the port 110 is formed in the valve seat 100; the connecting socket 200 is disposed at the port 110; the guide sleeve 300 is arranged in the valve cavity 120, the guide sleeve 300 is connected with the connecting seat 200, and the guide sleeve 300 and the connecting seat 200 are integrally formed or arranged in a split manner; the valve port seat 400 is provided with a valve port 410, the valve port seat 400 is connected with the guide sleeve 300 in a sealing way, the inner wall of the valve port 410 forms a flow regulating surface 411, and the flow regulating surface 411 extends downwards; the valve needle assembly 700 is movably disposed on the guide sleeve 300, the valve needle assembly 700 includes a valve rod 710 and a valve head 720 connected to the valve rod 710, the valve head 720 is movably inserted into the valve port 410, and the valve rod 710 is capable of reciprocating along the axial direction of the valve port 410 to drive the valve head 720 to open or close the valve port 410; wherein the valve port seat 400 has a hardness less than the hardness of the valve head 720.

It should be emphasized that the valve seat 100 of the electronic expansion valve 10 may be the valve seat 100 specially used for mounting the electronic expansion valve components such as the guide sleeve 300, the connecting seat 200, etc. to form a single electronic expansion valve 10, or the valve seat 100 may also be the valve seat 100 of an integrated module, on which the electronic expansion valve components such as the guide sleeve 300, the connecting seat 200, etc. of the present application, and other structural components may be mounted. The valve seat 100 may be made of stainless steel, aluminum, or other materials, and is not limited in this regard. The valve seat 100 may be cylindrical, square, or otherwise shaped. A port 110 is formed at one end of the valve seat 100, the port 110 is specifically a stepped hole, and the connecting seat 200 is fixedly installed in the stepped hole, so that the connecting seat 200 can be in threaded connection with the inner wall of the stepped hole for convenience of later-stage disassembly and assembly. The valve seat 100 is also provided with a valve cavity 120, the valve cavity 120 is communicated with the port 110, a first interface 130 and a second interface 140 can be arranged on the valve seat 100, the first interface 130 and the second interface 140 are used for connecting pipelines, the first interface 130 and the second interface 140 can be communicated through the valve cavity 120, so that fluid medium can enter from the first interface 130 and flow out from the second interface 140 through the valve cavity 120; conversely, fluid medium may also enter from the second port 140 and exit from the first port 130 through the valve chamber 120, i.e., fluid medium may flow into the valve chamber 120 from either the first port 130 or the second port 140 and exit from the other port. In this embodiment, fluid medium flows into the valve chamber 120 from the first port 130 and flows out from the second port 140.

The guide sleeve 300 is disposed in the valve cavity 120 and located below the connecting seat 200, and the guide sleeve 300 is connected to the connecting seat 200, wherein the guide sleeve 300 may be fixedly connected to the connecting seat 200 or movably connected to the connecting seat 200, and the connection manner of the guide sleeve 300 may be riveting, welding, clamping, or the like, or may be connected by a connection structure, or may be hermetically connected by a sealing structure 500, which is not particularly limited. The diameter of the connecting seat 200 of this application is great, and the diameter of uide bushing 300 is less, sets up both components of a whole that can function independently to link together uide bushing 300 and connecting seat 200. Compared with the traditional scheme that the guide sleeve 300 and the connecting seat 200 are integrally arranged, the technical scheme of the application has the advantages that when the guide sleeve 300 and the connecting seat 200 are respectively machined, machining allowance is small, machining time is short, and production efficiency can be improved; meanwhile, the machining allowance is small, so that the loss of raw materials can be further reduced, and the cost is reduced; further, when the guide sleeve 300 and the connecting seat 200 are respectively machined, the abrasion degree of the cutter is small, the cutter does not need to be frequently replaced, the service life of the cutter is prolonged, and the cost is further reduced.

Referring to fig. 4, the guide sleeve 300 has a medium flow-through chamber 330 and a mounting port 340, the medium flow-through chamber 330 is communicated with the valve chamber 120, and the valve chamber 120 is communicated with the first port 130. The valve port seat 400 is installed at the installation port 340 and is hermetically connected with the guide sleeve 300, the valve port seat 400 has a valve port 410, the valve port 410 is communicated with the second port 140, and the medium circulation chamber 330 can be communicated with the valve port 410. When the electronic expansion valve 10 is in operation, the fluid medium will first enter the valve chamber 120 from the first port 130, then enter the medium circulation chamber 330 through the valve chamber 120, then exit the valve port 410 in the medium circulation chamber 330, and finally exit through the second port 140.

The electronic expansion valve 10 further includes a valve needle assembly 700, the valve needle assembly 700 is disposed in the guide sleeve 300 and is movable along an axial direction of the guide sleeve 300, the guide sleeve 300 mainly guides the movement of the valve needle assembly 700, and the valve needle assembly 700 can open or close the valve port 410 to control the flow and the flow rate of the fluid medium in the electronic expansion valve 10. Specifically, the valve needle assembly 700 comprises a valve stem 710 and a valve head 720 connected to the valve stem 710, the valve port 410 is communicated with the second port 140, and the valve port 410 is used for inserting the valve head 720 of the valve needle assembly 700, so as to block the fluid medium in the electronic expansion valve 10 from being discharged outwards through the valve port 410. When the valve head 720 of the valve needle assembly 700 closes the valve port 410, that is, the medium circulation chamber 330 is disconnected from the valve port 410, the electronic expansion valve 10 is closed, and the fluid medium cannot flow from the first port 130 to the second port 140; when the valve head 720 of the valve needle assembly 700 releases the seal of the valve port 410, that is, the medium circulation chamber 330 and the valve port 410 are communicated with each other, the electronic expansion valve 10 is opened, and the fluid medium can flow from the first port 130 to the second port 140. The inner wall of the valve port 410 forms a flow rate adjusting surface 411, the flow rate adjusting surface 411 extends downward in a downward inclination manner, the valve head 720 is cylindrically shaped, when the valve head 720 abuts against the flow rate adjusting surface 411, the valve head 720 completely closes the valve port 410, when the valve head 720 moves upward, a gap exists between the valve head 720 and the flow rate adjusting surface 411, the gap is continuously increased along with the upward movement of the valve head 720, the fluid medium flows through the valve port 410 from the gap and flows out, and the valve head 720 controls the size of the gap between the valve head 720 and the flow rate adjusting surface 411, so as to control the size of the flow rate of the fluid medium in the electronic expansion valve 10.

It should be emphasized here that the valve port seat 400 is in sealing connection with the guide sleeve 300, so that when the valve head 720 closes the valve port 410, the fluid medium is prevented from flowing out from a gap between the valve port seat 400 and the guide sleeve 300, and the possibility of internal leakage of the electronic expansion valve 10 is reduced, further, the valve head 720 and the valve port seat 400 may be made of different materials, so as to improve the sealing performance between the valve head 720 and the valve port 410 when the valve head 720 closes the valve port 410, and further reduce the possibility of internal leakage of the electronic expansion valve 10.

The electronic expansion valve 10 of the present invention comprises a valve seat 100, a connecting seat 200, a guide sleeve 300 and a valve seat 400; a port 110 is formed at one end of the valve seat 100, and a valve cavity 120 communicated with the port 110 is formed in the valve seat 100; the connecting socket 200 is disposed at the port 110; the guide sleeve 300 is arranged in the valve cavity 120, and the guide sleeve 300 is connected with the connecting seat 200; the valve port seat 400 is provided with a valve port 410, the valve port seat 400 is connected with the guide sleeve 300 in a sealing manner, the inner wall of the valve port 410 forms a flow regulating surface 411, and the flow regulating surface 411 extends downwards in a downward inclined manner. In this way, by hermetically connecting the valve port seat 400 and the guide sleeve 300, the fluid medium can be prevented from flowing out from the gap between the valve port seat 400 and the valve head 720 when the valve head 720 closes the valve port 410, and the problem of internal leakage during use of the electronic expansion valve 10 can be solved.

In one embodiment, the valve seat 400 is made of a non-metal material. Specifically, the nonmetal generally refers to inorganic-based glass, ceramics, graphite, rock, organic-based wood, plastics, rubber, and the like, and is composed of crystals or amorphous materials. In this embodiment, the valve port seat 400 may be made of rubber, plastic, or other materials, and only the hardness of the valve port seat 400 needs to be smaller than that of the valve head 720, so as to ensure the sealing property between the valve head 720 and the flow regulating surface 411 when the valve head 720 abuts against the flow regulating surface 411 of the valve port 410, thereby reducing the possibility of leakage in the electronic expansion valve 10.

Referring to fig. 4 and 5, in an embodiment, the electronic expansion valve 10 further includes a sealing structure 500, the sealing structure 500 is located between an inner wall surface of the guide sleeve 300 and an outer wall surface of the valve seat 400, and the guide sleeve 300 and the valve seat 400 are hermetically connected through the sealing structure 500. Specifically, the sealing structure 500 may be a sealing element separately disposed, or may be a sealing portion integrally disposed with the guide sleeve 300 or the valve seat 400, and the guide sleeve 300 and the valve seat 400 are hermetically connected by the sealing structure 500, so as to prevent the fluid medium from flowing out through a connection between the guide sleeve 300 and the valve seat 400, and avoid internal leakage of the electronic expansion valve 10 during use.

Referring to fig. 4 and 5, based on the above embodiment, the sealing structure 500 includes a plurality of ribs 510 disposed on an outer wall surface of the valve seat 400, an inner wall surface of the guide sleeve 300 is provided with a plurality of limiting grooves, and the ribs 510 are disposed in the limiting grooves. Specifically, when the valve seat 400 is assembled, the valve seat 400 is pressed into the installation opening 340 of the guide sleeve 300, and the plurality of ribs 510 are adapted to be clamped into the plurality of limiting grooves, so that the guide sleeve 300 and the valve seat 400 are hermetically connected together, a fluid medium is prevented from flowing out through a connection portion between the guide sleeve 300 and the valve seat 400, and internal leakage of the electronic expansion valve 10 during use is avoided. Of course, the plurality of ribs 510 may be disposed on the inner wall surface of the guide sleeve 300, and the plurality of stopper grooves may be disposed on the outer wall surface of the valve port seat 400, so that the positions of the ribs 510 and the stopper grooves are not limited.

In another embodiment (this embodiment is not shown), the sealing structure 500 includes a first sealing member, an outer wall surface of the valve seat 400 is opened with a first groove, and the first sealing member is disposed in the first groove and abuts against an inner wall surface of the guide sleeve 300; alternatively, the inner wall surface of the guide sleeve 300 is provided with a first groove, and the first sealing member is disposed in the first groove and abuts against the outer wall surface of the valve seat 400.

Specifically speaking, the first sealing element can be a rubber ring, the rubber ring has elasticity, the rubber ring is placed in the first groove, and the first groove can play a good limiting role for the first sealing element. The first sealing element can be abutted against the inner wall surface of the guide sleeve 300 or the outer wall surface of the valve port seat 400, the first sealing element is assembled by interference fit, after the assembly is completed, the first sealing element can deform and is tightly abutted against the inner wall surface of the guide sleeve 300 or the outer wall surface of the valve port seat 400, so that the valve port seat 400 is hermetically connected with the guide sleeve 300, the sealing property of the joint of the valve port seat 400 and the guide sleeve 300 is improved, a fluid medium is prevented from flowing out through the joint of the guide sleeve 300 and the valve port seat 400, and the electronic expansion valve 10 is prevented from generating internal leakage when in use.

Specifically, any one of the above embodiments may be selected according to actual requirements, or both of the embodiments may be implemented simultaneously, and no specific limitation is set herein.

Referring to fig. 2, 4 and 6, in an embodiment, the electronic expansion valve 10 further includes a gasket 600, and the gasket 600 is connected to the guide sleeve 300 and abuts against the lower end of the valve seat 400. Specifically, a gasket 600 may be disposed at the lower end of the valve port seat 400, the upper end of the gasket 600 abuts against the lower end of the valve port seat 400, and the gasket 600 is fixedly connected to the guide sleeve 300, so as to support the valve port seat 400. The gasket 600 should be provided with a through hole corresponding to the valve port 410 of the valve port seat 400 for the fluid medium to flow through. The spacer 600 may be connected to the guide sleeve 300 in many ways, and in this embodiment, the spacer 600 is riveted to the guide sleeve 300. It can be understood that the lower end of the guide sleeve 300 is provided with a rivet 310 protruding downward, and the rivet 310 is deformed by itself to abut against the lower end surface of the gasket 600. Specifically, when the valve seat 400 is pressed into the mounting opening 340 of the guide sleeve 300, and then the gasket 600 is pressed into the mounting opening 340 of the guide sleeve 300, the caulking portion 310 at the lower end of the guide sleeve 300 is deformed to abut against the lower end surface of the gasket 600 by the caulking means, so that the gasket 600 is fixedly mounted in the mounting opening 340 of the guide sleeve 300, and at this time, the upper end of the gasket 600 abuts against the lower end of the valve seat 400, and the gasket 600 can support the valve seat 400. The material of the gasket 600 may be a metal material, or may also be a non-metal material, which is not particularly limited.

In another embodiment, the gasket 600 is made of metal, and the gasket 600 is welded to the guide sleeve 300. Specifically, because uide bushing 300 adopts the metal material to make, when the material of gasket 600 was the metal material, can be with gasket 600 and uide bushing 300 welded fastening to improve the steadiness that gasket 600 and uide bushing 300 are connected.

Referring to fig. 2, 4 and 6, in an embodiment, the outer wall surface of the guide sleeve 300 is provided with a second groove 320, a second sealing member 520 is disposed in the second groove 320, and the second sealing member 520 abuts against the inner wall surface of the valve seat 100. Specifically, the second sealing element 520 may be a rubber ring, and the rubber ring has elasticity, and the rubber ring is placed in the second groove 320, and the second groove 320 may provide a better limit for the second sealing element 520. The second groove 320 is formed on an outer wall surface of a lower end of the guide sleeve 300, and the height of the second groove 320 is lower than that of the first port 130. The second sealing element 520 can be abutted against the inner wall surface of the valve seat 100, the second sealing element 520 is assembled by interference fit, after the assembly is completed, the first and second sealing elements can deform and tightly abut against the inner wall surface of the valve seat 100, so that the guide sleeve 300 is hermetically connected with the valve seat 100, the sealing property of the joint of the lower end of the guide sleeve 300 and the valve seat 100 is improved, a fluid medium is prevented from flowing out through the joint of the guide sleeve 300 and the valve seat 400, and the electronic expansion valve 10 is prevented from generating internal leakage when in use. Of course, the second groove 320 may be formed in the inner wall surface of the valve seat 100 so that the second seal 520 abuts against the outer wall surface of the guide sleeve 300, and the opening position of the second groove 320 is not particularly limited.

Referring to fig. 1 to 6, in an embodiment, a diameter of a lower end of the flow rate adjustment surface 411 is smaller than a diameter of an upper end of the flow rate adjustment surface 411. Specifically, since the valve head 720 is cylindrical, in order to control the flow rate of the fluid medium in the electronic expansion valve 10, the flow rate adjusting surface 411 is inclined downward and extends, and the diameter of the lower end of the flow rate adjusting surface 411 is smaller than the diameter of the upper end of the flow rate adjusting surface 411, when the valve head 720 abuts against the flow rate adjusting surface 411, the valve head 720 completely closes the valve port 410, when the valve head 720 moves upward, a gap exists between the valve head 720 and the flow rate adjusting surface 411, and the gap increases with the upward movement of the valve head 720, the fluid medium flows through the valve port 410 from the gap and flows out, and the valve head 720 controls the size of the gap between the valve head 720 and the flow rate adjusting surface 411, thereby playing a role of controlling the flow rate of the fluid medium in the electronic expansion valve 10.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a valve needle assembly 700, the valve needle assembly 700 is movably disposed on the guide sleeve 300, the valve needle assembly 700 includes a valve rod 710 and a valve head 720 connected to the valve rod 710, the valve head 720 is movably inserted into the valve port 410, and the valve rod 710 is capable of reciprocating along an axial direction of the valve port 410 to drive the valve head 720 to open or close the valve port 410.

Specifically, the valve head 720 extends into the guide sleeve 300 and is in guiding fit with the guide sleeve 300, and the valve rod 710 can drive the valve head 720 to move along the axial direction of the valve port 410 so as to open or close the valve port 410. The valve port 410 is communicated with the second port 140, and the valve port 410 is used for inserting the valve head 720, so as to block the fluid medium in the electronic expansion valve 10 from being discharged outwards through the valve port 410. When the valve head 720 closes the valve port 410, that is, the medium flow-through chamber 330 is disconnected from the valve port 410, the electronic expansion valve 10 is closed, and the fluid medium cannot flow from the first port 130 to the second port 140; when the valve head 720 releases the seal of the valve port 410, that is, the medium flow-through chamber 330 and the valve port 410 are communicated with each other, the electronic expansion valve 10 is opened, and the fluid medium can flow from the first port 130 to the second port 140. The inner wall of the valve port 410 forms a flow regulating surface 411, the flow regulating surface 411 extends obliquely downwards, the valve head 720 is in a cylindrical shape, when the valve head 720 abuts against the flow regulating surface 411, the valve head 720 completely closes the valve port 410, when the valve head 720 moves upwards, a gap exists between the valve head 720 and the flow regulating surface 411, the gap is continuously enlarged along with the upward movement of the valve head 720, the fluid medium can flow through the valve port 410 from the gap and flow out, and the valve head 720 controls the size of the gap between the valve head 720 and the flow regulating surface 411, so as to control the size of the flow of the fluid medium in the electronic expansion valve 10.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a nut component 800 and a rotor component 900, the nut component 800 is in threaded connection with the valve needle component 700, and the rotor component 900 is sleeved on the valve needle component 700 and can drive the valve needle component 700 to rotate relative to the nut component 800, so that the valve stem 710 reciprocates along an axial direction of the valve port 410 to drive the valve head 720 to open or close the valve port 410.

Specifically, the nut assembly 800 is fixedly connected to the connecting seat 200, the nut assembly 800 has a nut, the nut is in threaded connection with the valve stem 710 of the valve needle assembly 700, the rotor assembly 900 is connected to the valve stem 710, and due to the threaded fit relationship between the nut and the valve stem 710, the rotor assembly 900 rotates to drive the valve stem 710 to rotate, so that the valve stem 710 makes a telescopic motion along the axial direction of the valve port 410, and a motion process that the valve stem 710 drives the valve head 720 to move is realized, so as to open or close the valve port 410.

The working principle of the electronic expansion valve 10 is as follows:

the stator assembly generates a magnetic field after being electrified, the rotor made of magnetic materials rotates under the driving of the magnetic field, the rotor is fixedly connected with the valve rod 710, the rotation of the rotor drives the valve rod 710 to rotate, the threaded matching relation of the nut and the valve rod 710 is formed between the valve rod 710 and the nut, and the nut assembly 800 is fixedly arranged on the connecting seat 200, so that the valve rod 710 can be driven to move in a telescopic mode relative to the nut by the rotation of the valve rod 710 relative to the nut, the stator assembly drives the rotor assembly 900 to move, and the rotor assembly 900 drives the valve needle assembly 700 to move.

The valve head 720 moves towards the valve port 410 under the driving of the valve rod 710, when the valve head 720 closes the valve port 410, that is, the medium circulation chamber 330 and the valve port 410 are disconnected from communication, the electronic expansion valve 10 is closed, and the fluid medium cannot flow from the first port 130 to the second port 140; when the valve head 720 releases the seal of the valve port 410, that is, the medium flow-through chamber 330 and the valve port 410 are communicated with each other, the electronic expansion valve 10 is opened, and the fluid medium can flow from the first port 130 to the second port 140. Because the opening aperture of the valve port 410 in the electronic expansion valve 10 is relatively small, the flow rate of the fluid medium is reduced, thereby realizing the throttling and pressure reducing process of the electronic expansion valve 10 on the fluid medium.

Referring to fig. 1, in an embodiment, the electronic expansion valve 10 further includes a valve housing 1000, the valve housing 1000 is a cylindrical structure with an open end, the valve housing 1000 is connected to the connecting seat 200 and covers the valve needle assembly 700, the nut assembly 800 and the rotor assembly 900. In particular, the valve housing 1000 is of substantially cylindrical design, and the valve housing 1000 and the connecting socket 200 can be fixed by welding. The valve housing 1000 has a receiving cavity formed therein, the receiving cavity further receives a rotor assembly 900 in addition to the nut assembly 800 and the valve needle assembly 700, the rotor assembly 900 is connected to the valve stem 710, and the valve stem 710 is rotated by the rotor assembly 900 to drive the valve head 720 to move to open or close the valve port 410. The fluid medium can flow into the receiving chamber during operation of the electronic expansion valve 10.

The utility model discloses still provide a refrigeration plant, refrigeration plant includes above-mentioned electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiments, and since the refrigeration device adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. Wherein, the refrigeration equipment is an air conditioner, a refrigerator or a heat pump water heater 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

1. An electronic expansion valve, comprising:

the valve comprises a valve seat, a valve core and a valve core, wherein a port is formed at one end of the valve seat, and a valve cavity communicated with the port is formed in the valve seat;

the connecting seat is arranged at the port;

the guide sleeve is arranged in the valve cavity, connected with the connecting seat and integrally formed or arranged in a split manner with the connecting seat;

the valve port seat is provided with a valve port and is in sealing connection with the guide sleeve, and the inner wall of the valve port forms a flow regulating surface which extends downwards; and

the valve needle assembly is movably arranged on the guide sleeve and comprises a valve rod and a valve head connected with the valve rod, the valve head is movably inserted into the valve port, and the valve rod can reciprocate along the axial direction of the valve port to drive the valve head to open or close the valve port;

wherein the hardness of the valve port seat is less than the hardness of the valve head.

2. The electronic expansion valve of claim 1, wherein the valve port seat is made of a non-metallic material.

3. The electronic expansion valve according to claim 2, further comprising a seal structure between an inner wall surface of the guide sleeve and an outer wall surface of the valve port seat, the guide sleeve and the valve port seat being sealingly connected by the seal structure.

4. The electronic expansion valve according to claim 3, wherein the sealing structure includes a plurality of ribs provided on an outer wall surface of the valve seat, and a plurality of limiting grooves are provided on an inner wall surface of the guide sleeve, the ribs being provided in the limiting grooves.

5. The electronic expansion valve according to claim 3, wherein the seal structure comprises a first seal member, an outer wall surface of the valve seat is provided with a first groove, and the first seal member is disposed in the first groove and abuts against an inner wall surface of the guide sleeve; or a first groove is formed in the inner wall surface of the guide sleeve, and the first sealing element is arranged in the first groove and is abutted against the outer wall surface of the valve port seat.

6. The electronic expansion valve of claim 1, further comprising a gasket coupled to the guide sleeve and abutting a lower end of the valve port seat.

7. The electronic expansion valve of claim 6, wherein the spacer is riveted to the guide sleeve.

8. The electronic expansion valve according to claim 7, wherein the lower end of the guide sleeve is provided with a rivet portion protruding downward, and the rivet portion abuts against the lower end surface of the gasket by self-deformation.

9. The electronic expansion valve of claim 6, wherein the gasket is made of metal, and the gasket is welded to the guide sleeve.

10. The electronic expansion valve according to claim 1, wherein the outer wall surface of the guide sleeve is provided with a second groove in which a second sealing member is provided, the second sealing member abutting against the inner wall surface of the valve seat.

11. The electronic expansion valve of claim 1, wherein the diameter of the lower end of the flow regulating surface is smaller than the diameter of the upper end of the flow regulating surface.

12. The electronic expansion valve of claim 1, further comprising a nut assembly and a rotor assembly, wherein the nut assembly is in threaded connection with the valve needle assembly, and the rotor assembly is sleeved on the valve needle assembly and can drive the valve needle assembly to rotate relative to the nut assembly.

13. The electronic expansion valve of claim 12, further comprising a valve housing having a cylindrical structure with an open end, wherein the valve housing is connected to the connecting base and covers the valve needle assembly, the nut assembly and the rotor assembly.

14. A refrigeration device, comprising an electronic expansion valve according to any of claims 1 to 13.

15. A refrigeration appliance as recited in claim 14 wherein said refrigeration appliance is an air conditioner, freezer, refrigerator or heat pump water heater.