CN112483719A

CN112483719A - Electronic expansion valve and refrigeration equipment

Info

Publication number: CN112483719A
Application number: CN202011483240.3A
Authority: CN
Inventors: 杨茂; 陈超; 黄龙华; 江波
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-03-12

Abstract

The invention discloses an electronic expansion valve and refrigeration equipment, wherein the electronic expansion valve comprises a valve shell, a valve core seat and a nut; the valve core seat is arranged on the valve shell, and a valve port is formed on the valve core seat; the nut is installed in the valve housing, be provided with the amortization clearance between nut and the valve core seat. The electronic expansion valve can effectively reduce noise and the risk of valve needle blocking, and improves the use effect of the electronic expansion valve.

Description

Electronic expansion valve and refrigeration equipment

Technical Field

The invention relates to the technical field of control valves, in particular to an electronic expansion valve for adjusting fluid flow and refrigeration equipment.

Background

In a refrigeration cycle system, an electronic expansion valve is usually provided between an evaporator and a condenser to change the flow rate of a refrigerant medium in the refrigeration system. However, when the refrigerant flows through the electronic expansion valve, since the liquid refrigerant is often mixed with gas, the refrigerant will generate a sound of breaking bubbles after flowing through the valve port, so that the electronic expansion valve will generate noise when in use.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve and refrigeration equipment, aiming at reducing noise generated in the use process of the electronic expansion valve.

In order to achieve the above object, the electronic expansion valve provided by the present invention comprises a valve housing, a valve core seat and a nut;

the valve core seat is arranged on the valve shell, and a valve port is formed on the valve core seat;

the nut is installed in the valve housing, be provided with the amortization clearance between nut and the valve core seat.

In one embodiment, the nut has an extending portion extending toward the valve port, and an end surface of the extending portion facing the valve core seat is spaced from an end surface of the valve core seat facing the extending portion to form the sound attenuation gap.

In an embodiment, the valve element seat includes a seat body and an annular flange protruding from an end surface of the seat body facing the extension portion, and the end surface of the extension portion facing the valve element seat and the end surface of the annular flange facing the extension portion are disposed at intervals to form the silencing gap.

In one embodiment, the valve core seat has a first cross section, the inner diameter of the valve port in the first cross section is smaller than or equal to the inner diameter of the valve port in other cross sections, and the gap value of the silencing gap is smaller than or equal to the inner diameter of the valve port in the first cross section.

In one embodiment, a valve cavity is defined in the valve housing, the extension portion is located in the valve cavity, an outer wall surface of the extension portion and an inner wall surface of the valve cavity are arranged at intervals to form a medium circulation cavity, a valve core installation cavity is defined on the inner side of the extension portion, and a circulation port communicating the medium circulation cavity and the valve core installation cavity is formed in the wall surface of the extension portion.

In one embodiment, the flow opening is a flow opening or a flow gap opened in the extension portion.

In one embodiment, the valve core seat has a first cross section, the inner diameter of the valve port in the first cross section is smaller than or equal to the inner diameter of the valve port in other cross sections, and the maximum length dimension of the communication port is smaller than or equal to the inner diameter of the valve port in the first cross section.

In one embodiment, the valve housing includes a valve seat, the valve seat has a mounting opening, the valve seat is mounted at the mounting opening, and the nut is mounted on a side of the valve seat away from the mounting opening.

In one embodiment, the valve seat is provided with a valve cavity and a port communicated with the valve cavity, one end of the valve port is communicated with the valve cavity, the other end of the valve port is communicated with a medium outflow pipe, the port is connected with a medium inflow pipe, and the extension portion extends towards the valve port to be arranged beyond the axis of the port.

In an embodiment, the extension extends toward the valve port to be disposed beyond an inner wall surface of the interface proximate the valve port.

In an embodiment, the electronic expansion valve further includes a valve needle assembly, and the extension portion is sleeved on the periphery of the valve needle assembly and is in guiding fit with the valve needle assembly.

In one embodiment, the valve needle assembly comprises a valve needle and a valve needle sleeve connected with the valve needle, and the extension part is sleeved on the periphery of the valve needle sleeve and is in guiding fit with the valve needle sleeve and the valve needle.

The invention also provides refrigeration equipment, which comprises an electronic expansion valve, wherein the electronic expansion valve comprises a valve shell, a valve core seat and a nut;

The electronic expansion valve of the invention enables the valve core seat to be arranged on the valve shell, and the valve core seat is provided with the valve port; the nut is arranged on the valve shell, and a silencing gap is arranged between the nut and the valve core seat. Therefore, after the refrigerant between the outer wall surface of the nut and the inner wall surface of the valve cavity flows to the silencing gap, the flow aperture is reduced from large to small, the bubbles are extruded and crushed in the silencing gap, and the bubbles cannot be crushed to generate a bursting sound due to the enlargement of the valve port, so that the effect of silencing the bubbles can be achieved; meanwhile, due to the blocking of the nut and/or the valve core seat, the refrigerant cannot impact the valve needle greatly, the flow direction of the refrigerant can be changed through the silencing gap, the functions of slowing and stabilizing flow are achieved, and the impact noise of the refrigerant and the blocking phenomenon of the valve needle can be reduced. In addition, compared with the embodiment that the nut is abutted to the valve core seat and the flow port is formed in the nut, the silencing gap is communicated in the circumferential direction, so that bubbles can extend and be broken in the circumferential direction after flowing into the silencing gap, compared with the case that the bubbles are broken through the flow port, the probability of the explosion of the bubbles at the valve port can be greatly reduced, and the silencing and noise reduction effects are better. And the silencing clearance is larger than the flow area of the flow port, so that the flow of the refrigerant flowing from the valve cavity to the valve port can be effectively improved, the on-way resistance of the fluid is reduced, and the using effect of the electronic expansion valve is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 electronic expansion valve according to an embodiment of the present invention;

fig. 2 is a sectional view of the electronic expansion valve of fig. 1, wherein the valve needle is in a state of opening the valve port;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a cross-sectional view of the electronic expansion valve of fig. 1, wherein the valve needle is in a state closing the valve port;

fig. 5 is a partially enlarged view of B in fig. 4.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship, motion, and the like between the components in the specific posture shown in fig. 1, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment 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 meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an electronic expansion valve which is applied to a refrigerating system. The refrigerating system can be a refrigerating system of an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The electronic expansion valve is able to control the refrigerant medium flow in the refrigeration system.

In an embodiment of the present invention, as shown in fig. 1 to 5, the electronic expansion valve includes a valve housing 100, a valve seat 200 and a nut 300. A valve cartridge 200 is mounted to the valve housing 100, the valve cartridge 200 having a valve port 210 formed thereon. A nut 300 is mounted to the valve housing 100, and a sound-deadening gap 400 (h shown in fig. 3) is provided between the nut 300 and the valve seat 200.

In this embodiment, the valve housing 100 may specifically include a valve seat 110 and a housing 130, and the housing 130 is connected to the valve seat 110 to seal the valve core assembly accommodated therein. The nut 300 is mounted on the valve housing 100, and the nut 300 may be mounted on the housing 130, the valve seat 110, or both the housing 130 and the valve seat 110. The nut 300 and the valve housing 100 may be connected to each other by a connector, interference fit, snap fit, or the like. The nut 300 may be injection molded from an engineering plastic. The electronic expansion valve further comprises a magnetic ring assembly and a valve core assembly which are arranged in the valve housing 100, wherein the valve core assembly comprises a valve rod 530 and a valve needle 510, the valve needle 510 is inserted into the valve port 210, the valve rod 530 is in threaded fit with the nut 300, and the valve rod 530 is in transmission connection with the valve needle 510. The magnetic ring assembly comprises a magnetic ring, a fixing plate and a guide rod, the fixing plate is connected with the magnetic ring and the stop rod, and one end of the valve rod 530, which is far away from the valve port 210, penetrates through the middle of the fixing plate. After the electronic expansion valve is powered on, the magnetic ring assembly drives the valve rod 530 to rotate, and the valve rod 530 is driven to move up and down by the threaded fit between the valve rod 530 and the nut 300, so that the valve needle 510 opens and closes the valve port 210, and the flow rate of the refrigerant is adjusted.

The valve core seat 200 may be specifically installed on the valve seat 110, and the valve core seat 200 and the valve seat 110 may be integrally formed or may be separately formed. The inner cavity of the valve seat 110 forms a valve cavity 111, and one end of the valve port 210 is communicated with the valve cavity 111, and the other end is communicated with the medium outflow pipe 600. It can be understood that one side of the valve cavity 111 is also communicated with the medium inflow pipe 700, and the refrigerant flows into the valve cavity 111 from the medium inflow pipe 700 and flows to the medium outflow pipe 600 through the valve port 210 when the valve needle 510 opens the valve port 210. Of course, the refrigerant may also realize a reverse flow, that is, the refrigerant may flow from the medium outflow pipe 600 into the valve cavity 111 through the valve port 210 and flow out from the medium inflow pipe 700.

It will be appreciated that by providing a sound attenuation gap 400 between the nut 300 and the valve cartridge seat 200, it is possible to extend only the lower end of the nut 300 towards the valve cartridge seat 200, to extend only the upper end of the valve cartridge seat 200 towards the nut 300, or to extend the lower end of the nut 300 towards the valve cartridge seat 200 while extending the upper end of the valve cartridge seat 200 towards the nut 300. The gap between the lower end of the nut 300 and the upper end of the valve plug seat 200 is only required to be small to form the silencing gap 400, and is not limited in particular. A sound-deadening gap 400 is formed between the nut 300 and the valve core seat 200, that is, the nut 300 and the valve core seat 200 are arranged in a non-contact manner. A silencing gap 400 is formed between the nut 300 and the valve body seat 200, and refrigerant between the outer wall surface of the nut 300 and the inner wall surface of the valve chamber 111 can flow into the valve port 210 through the silencing gap 400 by the throttle principle. Since the liquid refrigerant is usually mixed with gas to generate bubbles, the silencing gap 400 is arranged between the nut 300 and the valve core seat 200, so that after the refrigerant between the outer wall surface of the nut 300 and the inner wall surface of the valve cavity 111 flows to the silencing gap 400, the flow aperture is reduced from large to small, the bubbles are crushed in the silencing gap 400 by extrusion, and the bubbles cannot be crushed to generate a popping sound at the valve port 210 to play a role in silencing the bubbles; meanwhile, due to the blocking of the nut 300 and/or the valve core seat 200, the refrigerant does not impact the valve needle 510 directly to a large extent, and the flow direction of the refrigerant can be changed through the silencing gap 400, so that the effects of slowing and stabilizing flow are achieved, and further, the impact noise of the refrigerant can be reduced and the valve needle 510 is prevented from being blocked. Further, compared to the embodiment in which the nut 300 is abutted against the valve body seat 200 and the communication port 312 is provided in the nut 300, since the silencing gap 400 is communicated in the circumferential direction, the air bubbles can be expanded and broken in the circumferential direction after flowing into the silencing gap 400, and the probability of the explosion of the air bubbles at the valve port 210 can be greatly reduced compared to the case in which the air bubbles are broken through the communication port 312, and the silencing and noise reducing effects are more excellent. And the silencing gap 400 is larger than the flow area of the flow opening 312, so that the flow rate of the refrigerant flowing from the valve cavity 111 to the valve port 210 can be effectively increased, the on-way resistance of the fluid is reduced, and the use effect of the electronic expansion valve is further improved.

The electronic expansion valve of the present invention has a valve port 210 formed on the valve core seat 200 by mounting the valve core seat 200 on the valve housing 100; the nut 300 is mounted to the valve housing 100, and a noise reduction gap 400 is provided between the nut 300 and the valve seat 200. Thus, when the refrigerant between the outer wall surface of the nut 300 and the inner wall surface of the valve cavity 111 flows into the silencing gap 400, the flow aperture is reduced from large to small, the bubbles are crushed in the silencing gap 400 by extrusion, and the bubbles are not crushed to generate a burst sound at the valve port 210, so that the function of silencing the bubbles can be achieved; meanwhile, due to the blocking of the nut 300 and/or the valve core seat 200, the refrigerant does not impact the valve needle 510 directly to a large extent, and the flow direction of the refrigerant can be changed through the silencing gap 400, so that the functions of flow slowing and flow stabilizing are achieved, and the impact noise of the refrigerant and the blocking phenomenon of the valve needle 510 can be reduced. Further, compared to the embodiment in which the nut 300 is abutted against the valve body seat 200 and the communication port 312 is provided in the nut 300, since the silencing gap 400 is communicated in the circumferential direction, the air bubbles can be expanded and broken in the circumferential direction after flowing into the silencing gap 400, and the probability of the explosion of the air bubbles at the valve port 210 can be greatly reduced compared to the case in which the air bubbles are broken through the communication port 312, and the silencing and noise reducing effects are more excellent. And the silencing gap 400 is larger than the flow area of the flow opening 312, so that the flow rate of the refrigerant flowing from the valve cavity 111 to the valve port 210 can be effectively increased, the on-way resistance of the fluid is reduced, and the use effect of the electronic expansion valve is further improved.

In one embodiment, referring to fig. 2 to 5, the nut 300 has an extending portion 310 extending toward the valve port 210, and an end surface of the extending portion 310 facing the valve core seat 200 and an end surface of the valve core seat 200 facing the extending portion 310 are spaced apart from each other to form the sound attenuation gap 400.

In this embodiment, it can be understood that the end surface of the extension portion 310 facing the valve core seat 200 and the end surface of the valve core seat 200 facing the extension portion 310 are spaced apart from each other, so that the silencing gap 400 can be formed in many ways. In one embodiment, the lower end surface of the extension 310 is located above the upper end surface of the valve cartridge seat 200. That is, the lower end surface of the extension portion 310 and the upper end surface of the valve cartridge seat 200 form the sound-deadening gap 400 in the up-down direction. In another embodiment, the lower end surface of the extension 310 is flush with the upper end surface of the valve cartridge seat 200, and the extension 310 surrounds the outer periphery of the valve cartridge seat 200, so that the lower end surface of the extension 310 and the upper end surface of the valve cartridge seat 200 form the sound-deadening gap 400 in the horizontal direction. In yet another embodiment, the extension portion 310 surrounds the periphery of the valve core seat 200 such that the lower end surface of the extension portion 310 is located below the upper end surface of the valve core seat 200, and the extension portion 310 and the valve core seat 200 are arranged in an up-down direction in an offset manner to form the sound attenuation gap 400. By extending the extension portion 310 of the nut 300 toward the valve port 210, the silencing gap 400 is formed between the end surface of the extension portion 310 facing the valve core seat 200 and the end surface of the valve core seat 200 facing the extension portion 310, and compared with the case where the valve core seat 200 extends toward the nut 300, the gap between the end surface of the valve core seat 200 and the bottom wall of the valve cavity 111 can be reduced, so that the flow rate of refrigerant between the outer wall surface of the valve core seat 200 and the bottom wall of the valve cavity 111 is reduced, and the refrigerant flow rate of the electronic expansion valve is further improved. Meanwhile, compared with the length of the valve core seat 200, the length of the extension nut 300 can be processed more simply, so that the processing and manufacturing cost can be reduced, and the installation between the valve core seat 200 and the valve housing 100 is easier.

On the basis of the above embodiment, as shown in fig. 5, the valve core seat 200 includes a seat body 220 and an annular flange 230 protruding from an end surface of the seat body 220 facing the extension portion 310, where the end surface of the extension portion 310 facing the valve core seat 200 and the end surface of the annular flange 230 facing the extension portion 310 are spaced apart from each other to form the sound-deadening gap 400 (as shown in fig. 3 h). Specifically, the end surface of the extension 310 facing the valve cartridge seat 200 is above the end surface of the annular flange 230 facing the extension 310.

In the present embodiment, by providing the annular flange 230 on the seat body 220, a step surface is formed between the upper end surface of the annular flange 230 and the seat body 220. And the silencing gap 400 is formed between the end surface of the extension part 310 facing the valve core seat 200 and the end surface of the annular flange 230 facing the extension part 310, the gap between the end surface of the extension part 310 of the nut 300 facing the valve core seat 200 and the upper end surface of the seat body 220 is larger than the silencing gap 400. Thus, when the refrigerant between the outer wall surface of the nut 300 and the inner wall surface of the valve cavity 111 flows to the valve core seat 200, the refrigerant firstly passes through the gap between the seat body 220 and the extension part 310 of the nut 300, and is decelerated for one stage to perform slow flow and steady flow, so that the impact noise of the refrigerant is reduced, and meanwhile, the bubbles are crushed by one-time extrusion through the gap, so that the volume of the bubbles flowing to the silencing gap 400 is reduced. The refrigerant continues to flow to valve port 210 by amortization clearance 400 afterwards, through the second grade speed reduction, slowly flows and the stationary flow once more, further reduces the impulsive noise of refrigerant, and the bubble carries out the secondary extrusion breakage to the bubble through amortization clearance 400 simultaneously, further reduces the broken probability of bubble flow direction valve port 210 department, very big reduction the explosion noise of bubble. So, make the refrigerant flow into valve port 210 after second grade speed reduction and bubble second grade extrusion breakage, avoid the refrigerant direct impact needle 510 to and avoid airflow to produce the blasting noise in valve port 210 department, thereby effectively reliable carries out slow flow and stationary flow to the refrigerant, furthest has reduced electronic expansion valve's impulsive noise and bubble blasting noise, has greatly promoted electronic expansion valve's use travelling comfort. Of course, the gap between the end surface of the extension portion 310 of the nut 300 facing the valve cartridge seat 200 and the upper end surface of the seat body 220 can also be a sound-deadening gap 400, and the sound-deadening gap 400 is smaller than or equal to the minimum inner diameter of the valve port 210. The noise of the electronic expansion valve can be further reduced.

In one embodiment, referring to fig. 3 and 5, the valve core seat 200 has a first cross section, an inner diameter (D shown in fig. 3) of the valve port 210 in the first cross section is smaller than or equal to an inner diameter (h shown in fig. 3) of the valve port 210 in other cross sections, and a clearance value (h shown in fig. 3) of the sound-deadening gap 400 is smaller than or equal to the inner diameter (D shown in fig. 3) of the valve port 210 in the first cross section. That is, the gap value of the sound-deadening gap 400 is less than or equal to the minimum inner diameter of the valve port 210.

In the present embodiment, it can be understood that, in order to increase the flow rate of the refrigerant at the valve port 210, the valve port 210 is generally designed to be a conical hole, and a throat of the conical hole is disposed near the nut 300. By making the inner diameter of the valve port 210 in the first cross-section smaller than or equal to the inner diameter of the valve port 210 in other cross-sections, i.e., the inner diameter of the valve port 210 in the first cross-section is the smallest inner diameter at the entire valve port 210. When the valve port 210 is designed as a cylindrical hole, the inner diameter of the valve port 210 in the first cross section is equal to the inner diameter of the valve port 210 in other cross sections. When the valve port 210 is designed as a conical hole, when large bubbles flow to the valve port 210, the large bubbles directly explode to generate a bursting sound. When the diameter of the bubble is equal to the diameter of the reduced port of the valve port 210, the bubble continues to flow after flowing to the reduced port of the valve port 210, and the volume of the bubble gradually increases due to the increase of the aperture of the valve port 210, and then the bubble is broken at the valve port 210 to generate explosion noise. When the diameter of the bubble is smaller than the diameter of the constricted portion of the valve port 210, the bubble does not burst, and noise is not generated. By making the gap value h of the silencing gap 400 smaller than or equal to the inner diameter D of the valve port 210 at the first cross section, that is, the gap value of the silencing gap 400 smaller than or equal to the minimum inner diameter D of the valve port 210, bubbles and large bubbles equal to the minimum inner diameter of the valve port 210 can be effectively crushed, and the large-volume bubbles can be fully and effectively prevented from flowing to the valve port 210 to explode to generate noise.

In an embodiment, as shown in fig. 2 to 5, a valve cavity 111 is defined in the valve housing 100, the extension portion 310 is located in the valve cavity 111, an outer wall surface of the extension portion 310 and an inner wall surface of the valve cavity 111 are arranged at an interval to form a medium circulation cavity 120, an inner side of the extension portion 310 defines a valve core installation cavity 311, and a wall surface of the extension portion 310 is opened with a circulation port 312 communicating the medium circulation cavity 120 and the valve core installation cavity 311.

In this embodiment, one or more than one flow port 312 may be provided. The shape of the communication port 312 may be circular, semicircular, elliptical, semi-elliptical, rectangular, triangular, polygonal, irregular, etc. By arranging the outer wall surface of the extension part 310 and the inner wall surface of the valve cavity 111 at intervals to form the medium circulation cavity 120, after the refrigerant medium flows into the valve cavity 111 from the medium inflow pipe 700, the refrigerant medium performs slow flow and steady flow in the medium circulation cavity 120 due to the blocking effect of the wall surface of the extension part 310, so that the phenomena of abnormal noise and valve needle 510 jamming caused by the refrigerant directly impacting the valve needle 510 can be further avoided. The inner side of the extension 310 defines a cartridge mounting cavity 311 for guiding assembly of the valve needle 510. The wall surface of the extension part 310 is provided with the circulation port 312 communicating the medium circulation cavity 120 and the valve core installation cavity 311, so that the medium circulation rate of the electronic expansion valve can be further improved, and meanwhile, the circulation port 312 can extrude and crush bubbles, so that the bubbles are further prevented from flowing to the valve port 210 to explode to generate noise, and the use performance of the electronic expansion valve is effectively improved. In order to increase the medium flow rate of the electronic expansion valve, in one embodiment, a plurality of flow ports 312 are formed in the wall surface of the extension portion 310, and the plurality of flow ports 312 are spaced in the circumferential direction of the extension portion 310. Specifically, the plurality of flow holes 312 may be uniformly spaced in the circumferential direction of the extension portion 310, so as to improve the uniformity of the refrigerant flow. In other embodiments, the extension 310 may not have the communication port 312.

Further, referring to fig. 3 and 5, the flow opening 312 is a flow hole or a flow gap opened in the extension portion 310. To make the circulation port 312 more effective in circulating the coolant medium, the circulation port 312 may be opened at an end of the extension 310 near the cartridge seat 200. When the circulation port 312 is a circulation hole, it is a complete hole opened on the wall surface of the extension part 310, and the shape of the circulation hole may be circular, semicircular, elliptical, semi-elliptical, rectangular, triangular, polygonal, irregular, etc. When the flow opening 312 is a flow gap, the flow opening 312 is a gap opened on the wall surface of the extension portion 310 and penetrating the lower end surface of the extension portion 310, that is, the lower end surface of the flow gap is opened. Thus, the lower end surface of the circulation notch is communicated with the silencing gap 400, and the circulation rate of the refrigerant can be effectively increased. The flow gap may be semi-elliptical, semi-circular, etc.

In one embodiment, as shown in FIG. 3, the maximum length dimension (L shown in FIG. 3) of the communication port 312 is less than or equal to the inner diameter (D shown in FIG. 3) of the valve port 210 in the first cross-section. The maximum length dimension of the communication port 312 means that the length from one point to another point on the inner wall surface of the communication port 312 is the longest. When the flow opening 312 is circular, the maximum length dimension is the diameter of the circular flow opening 312. When the flow opening 312 is oval, the maximum length dimension is the major axis dimension of the oval flow opening 312. When the flow opening 312 has a rectangular shape, the maximum length dimension is a diagonal length dimension of the rectangular shape. When the flow ports 312 are of other shapes, and so on, they are not listed here. By making the maximum length dimension of the circulation port 312 less than or equal to the inner diameter of the valve port 210 at the first cross section, that is, making the maximum length dimension of the circulation port 312 less than or equal to the minimum inner diameter of the valve port 210, the large bubbles can be broken through the circulation port 312 while the refrigerant circulation rate of the electronic expansion valve is increased through the circulation port 312, and further the bubbles are prevented from being broken at the valve port 210 to form explosion noise.

Further, the flow opening 312 is a flow gap, and the sum of the length of the flow gap in the axial direction of the extension portion 310 and the clearance between the lower end surface of the extension portion 310 and the upper end surface of the valve cartridge seat 200 is smaller than or equal to the inner diameter of the valve port 210 in the first cross section. Therefore, the sum of the gaps between the flow gap and the lower end surface of the extension portion 310 and the upper end surface of the valve core seat 200 is smaller than or equal to the minimum inner diameter of the valve port 210, so that large bubbles can be prevented from passing through, the large bubbles can be completely and effectively prevented from exploding at the valve port 210, and the use noise of the electronic expansion valve is further reduced.

Specifically, as shown in fig. 2 and 4, the valve housing 100 includes a valve seat 110, a mounting opening 112 is opened on the valve seat 110, the valve core seat 200 is mounted at the mounting opening 112, and the nut 300 is mounted on a side of the valve seat 110 away from the mounting opening 112. The valve core seat 200 and the valve seat 110 can be connected by welding, so that the sealing reliability of the valve core seat 200 and the valve seat 110 is ensured. In other embodiments, the valve seat 110 may be integrally formed with the valve cartridge seat 200. Through making the nut 300 install in the one side that the installing port 112 was kept away from to the disk seat 110, then compare and install nut 300 on shell 130, it is more firm to make the nut 300 be close to the side installation of valve port 210, can effectively avoid rocking of the extension 310 of nut 300, thereby can avoid appearing eccentric and frictional problem between the extension 310 of nut 300 and the case subassembly, and then can avoid the case subassembly to take place the card dead phenomenon because of the axiality when moving in nut 300, and can effectively reduce electronic expansion valve's whole noise, promote holistic life. Specifically, an annular metal connecting piece may be embedded on the nut 300 and fixed with the valve seat 110 by the annular metal connecting piece. The nut 300 can be made of plastic, can be made of engineering resin and is integrally injection-molded with the annular metal connecting sheet. A positioning portion may be provided on the nut 300 so as to be interference-fitted with the inner wall surface of the valve seat 110. So, through the axial displacement of annular metal connecting piece restriction nut 300, the circumferential direction of nut 300 is injectd through the interference fit of location portion to make the connection between nut 300 and the disk seat 110 more firm, prevent that nut 300 from taking place to rock or deflect because of the vibration.

In an embodiment, referring to fig. 1, fig. 2 and fig. 4, the valve seat 110 has a valve cavity 111 and a port 113 communicating with the valve cavity 111, one end of the valve port 210 is communicated with the valve cavity 111, the other end is used for communicating with a medium outflow pipe 600, the port 113 is used for connecting a medium inflow pipe 700, and the extension portion 310 extends toward the valve port 210 to be disposed beyond an axis of the port 113.

In this embodiment, the valve cavity 111 is an inner cavity of the valve seat 110. Specifically, a mouthpiece 113 is provided on a side wall surface of the valve seat 110. The medium inflow pipe 700 is sealingly inserted into the port 113. The media flow outlet 600 is inserted into the valve cartridge 200 to communicate the valve port 210 with the media flow outlet 600. The refrigerant flows into the valve cavity 111 through the medium inflow pipe 700, flows into the inner cavity of the extension part 310 through the gap between the extension part 310 and the valve cartridge seat 200, and then flows to the medium outflow pipe 600 through the valve port 210. It can be understood that, by arranging the extension portion 310 to extend toward the valve port 210 to an axis beyond the interface 113, after the refrigerant flows from the medium inflow pipe 700 to the valve chamber 111, the noise caused by the refrigerant directly impacting the valve needle 510 can be effectively avoided due to the partial shielding of the outer wall surface of the extension portion 310. Meanwhile, the extension part 310 shields the refrigerant to play a role in slow flow and steady flow, and the refrigerant can more slowly pass through the silencing gap 400 between the extension part 310 and the valve core seat 200, so that the probability of airflow flowing to the valve port 210 is reduced, and the noise of the electronic expansion valve is further reduced.

Further, as shown in fig. 2 and 4, the extension 310 extends toward the valve port 210 to be disposed adjacent to an inner wall surface of the valve port 210 beyond the interface 113. By extending the extension part 310 towards the valve port 210 to a position beyond the inner wall surface of the port 113 close to the valve port 210, the outer wall surface of the extension part 310 can completely oscillate the refrigerant flowing out of the medium inflow pipe 700, and the refrigerant can be completely prevented from directly flowing out of the medium inflow pipe 700 and impacting the valve needle 510, so that after the refrigerant flows out of the medium outflow pipe 600, the refrigerant can flow slowly and stably in a cavity between the outer wall surface of the extension part 310 and the inner wall surface of the valve cavity 111, thereby ensuring that the refrigerant uniformly and slowly flows from the silencing gap 400 to the valve port 210, improving the blocking and crushing effect of the silencing gap 400 on bubbles, and effectively reducing the overall noise.

In an embodiment, as shown in fig. 2 and 4, the electronic expansion valve further includes a valve needle assembly 500, and the extension portion 310 is sleeved on the periphery of the valve needle assembly 500 and is in guiding fit with the valve needle assembly 500. Through making extension 310 cover locate the periphery of needle subassembly 500, and with needle subassembly 500 guide fit, usable extension 310 leads to needle subassembly 500 to need not to set up the uide bushing in addition or make the ascending formation uide bushing of valve core seat 200, and then can reduce spare part, simplify overall structure, play the guide effect to the valve core subassembly when utilizing extension 310 noise reduction. In addition, because the nut 300 has high connection stability, the valve needle 510 is guided by the extending portion 310 of the nut 300, and because the valve rod 530 is also guided by the nut 300, the coaxiality of the valve rod 530, the valve needle 510 and the nut 300 can be better ensured, so that the whole coaxiality is high, the operation precision of the whole electronic expansion valve is higher, the use is smoother, and the blocking probability of the valve needle 510 is further reduced.

Further, the valve needle assembly 500 includes a valve needle 510 and a valve needle sleeve 520 connected to the valve needle 510, and the extension portion 310 is sleeved on the periphery of the valve needle sleeve 520 and is in guiding fit with the valve needle sleeve 520 and the valve needle 510. Needle sleeve 520 and needle 510 may be connected by an interference fit. So that the valve needle sleeve 520 is interference fit over the periphery of the valve needle 510. Through making extension 310 cover locate the periphery of needle cover 520, can avoid the refrigerant direct impact needle 510, and make extension 310 and needle cover 520 and needle 510 direction cooperation to can carry out the guide effect simultaneously to needle cover 520 and needle 510, and then ensure the axiality between needle cover 520, needle 510, valve rod 530, the nut 300, avoid appearing eccentric problem, thereby reduce the card risk of dying of needle 510. By arranging the valve needle 510 and the valve needle sleeve 520 in a split manner, the injection molding of the valve needle 510 is more convenient, so that the top surface of the valve needle 510 can be molded more smoothly, and the friction force between the valve needle 510 and the buffer slide block can be reduced. In other embodiments, valve needle 510 and valve needle sleeve 520 may be integrally formed.

In one embodiment, referring again to fig. 2 and 4, the valve needle assembly 500 includes a valve needle sleeve 520, a valve stem 530, a valve needle 510, a damping slider, and a damping spring. The needle sleeve 520 has opposite first and second open ends; the valve rod 530 has an actuating end, the valve rod 530 is disposed through the first opening end, and the actuating end of the valve rod 530 is disposed in the valve needle sleeve 520; the valve needle 510 is mounted to a second open end of the valve needle sleeve 520; the buffer slide block is arranged in the valve needle sleeve 520 and is abutted with the valve needle 510; the buffer spring is arranged in the valve needle sleeve 520, and the action end of the valve rod 530 is connected with the buffer slide block through the buffer spring.

Specifically, the nut 300 is provided with an installation hole extending along the axial direction thereof, and the valve rod 530 is inserted into the installation hole and rotatably connected to the nut 300. The valve rod 530 comprises a guide rod section and a threaded rod section, the mounting hole comprises a guide hole section matched with the guide rod section and a threaded hole section matched with the threaded rod section, the guide rod section is in interference fit or clearance fit with the guide hole section, and the threaded rod section is in threaded fit with the threaded hole section.

The valve needle assembly 500 may be composed of only the valve needle sleeve 520, the valve rod 530, the valve needle 510, the buffer slider and the buffer spring, so that the valve needle assembly 500 has fewer parts, thereby achieving the effect of saving cost, but not limited thereto. The valve rod 530, the nut 300 and the valve needle 510 are coaxially arranged. The valve rod 530 has an actuating end near the valve needle 510, the valve rod 530 is disposed through a first open end of the valve needle sleeve 520, and the actuating end of the valve rod 530 is located within the valve needle sleeve 520. The actuating end of the valve stem 530 is clearance fit with the first open end of the valve needle hub 520 such that the valve stem 530 is axially movable relative to the valve needle hub 520 along the same. The valve needle 510 is installed at the second opening end of the valve needle sleeve 520, and the valve needle 510 is in interference fit with the second opening end of the valve needle sleeve 520. The buffer spring and the buffer slide block are both positioned in the valve needle sleeve 520, the buffer slide block is opposite to the action end of the valve rod 530 and is arranged at intervals, and the buffer spring is arranged between the buffer slide block and the action end of the valve rod 530 so as to be connected with the buffer slide block and the action end of the valve rod 530. Specifically, the buffer spring is a compression spring. In this way, when the valve rod 530 moves axially relative to the valve needle sleeve 520, the valve rod 530 can drive the buffer slider to rotate through the buffer spring, and the valve needle 510 remains stationary, so as to avoid the wear caused by the rotation of the valve needle 510 relative to the valve port 210. After the valve rod 530 moves along the axial direction thereof to abut against the valve needle sleeve 520, the valve rod 530 can drive the valve needle 510 to move together through the valve needle sleeve 520, so as to control the opening degree of the valve port 210, that is, control the flow rate of the electronic expansion valve. Optionally, the valve rod 530, the buffer spring, the buffer slide block and the valve needle sleeve 520 are coaxially arranged, so that good coaxiality of the valve core assembly can be ensured.

In the embodiment of the present invention, the cushion slider abuts against the valve needle 510, so that the cushion slider can rotate relative to the valve needle 510, which can prevent the valve needle 510 from rotating relative to the valve port 210 and the valve needle sleeve 520 from rotating relative to the mounting hole of the nut 300, thereby preventing the valve needle 510 and the valve needle sleeve 520 from being worn. The cushion slide may be made of a material with high lubricity, which may reduce the friction between the cushion slide and the valve needle 510, thereby reducing the wear caused by the rotation of the cushion slide relative to the valve needle 510. Optionally, the cushion slide is made of a non-metal material, such as, but not limited to, a plastic material. By adopting the non-metallic buffer slider, the friction between the buffer slider and the metal valve needle 510 can be reduced, and the abrasion caused by the rotation of the buffer slider relative to the valve needle 510 can be reduced.

The present invention further provides a refrigeration device, which includes an electronic expansion valve, and the specific structure of the electronic expansion valve refers to the above embodiments, and since the refrigeration device adopts all the technical solutions of all the above embodiments, the refrigeration device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. The refrigerating equipment can be an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The electronic expansion valve is able to control the refrigerant medium flow in the refrigeration system.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve housing;

the valve core seat is arranged on the valve shell and is provided with a valve port; and

the nut is installed on the valve shell, and a silencing gap is formed between the nut and the valve core seat.

2. The electronic expansion valve of claim 1, wherein the nut has an extension portion extending toward the valve port, and an end surface of the extension portion facing the valve cartridge seat is spaced apart from an end surface of the valve cartridge seat facing the extension portion to form the acoustic damping gap.

3. The electronic expansion valve according to claim 2, wherein the valve plug seat comprises a seat body and an annular flange protruding from an end surface of the seat body facing the extension portion, and the end surface of the extension portion facing the valve plug seat and the end surface of the annular flange facing the extension portion are spaced apart from each other to form the silencing gap.

4. The electronic expansion valve according to any of claims 1 to 3, wherein the valve cartridge seat has a first cross section, an inner diameter of the valve port in the first cross section is smaller than or equal to an inner diameter of the valve port in other cross sections, and a clearance value of the sound-deadening gap is smaller than or equal to the inner diameter of the valve port in the first cross section.

5. The electronic expansion valve according to claim 2, wherein a valve chamber is defined in the valve housing, the extension portion is located in the valve chamber, an outer wall surface of the extension portion and an inner wall surface of the valve chamber are arranged at an interval to form a medium circulation chamber, a valve core installation chamber is defined inside the extension portion, and a circulation port communicating the medium circulation chamber and the valve core installation chamber is formed in a wall surface of the extension portion.

6. The electronic expansion valve according to claim 5, wherein the communication port is a communication hole or a communication gap opened in the extension portion.

7. The electronic expansion valve of claim 5, wherein the valve cartridge seat has a first cross-section, wherein an inner diameter of the valve port in the first cross-section is smaller than or equal to an inner diameter of the valve port in other cross-sections, and wherein a maximum length dimension of the communication port is smaller than or equal to the inner diameter of the valve port in the first cross-section.

8. The electronic expansion valve according to claim 2, wherein the valve housing comprises a valve seat, the valve seat defines a mounting opening, the valve seat is mounted at the mounting opening, and the nut is mounted on a side of the valve seat away from the mounting opening.

9. The electronic expansion valve of claim 8, wherein the valve seat has a valve chamber and a port communicating with the valve chamber, the valve port has one end communicating with the valve chamber and the other end communicating with a medium outflow pipe, the port is used for connecting a medium inflow pipe, and the extension portion extends toward the valve port to a position beyond an axis of the port.

10. The electronic expansion valve of claim 9, wherein the extension extends toward the valve port to be disposed beyond an inner wall surface of the port proximate to the valve port.

11. The electronic expansion valve of claim 2, further comprising a valve needle assembly, wherein the extension portion is disposed around the valve needle assembly and is in guiding engagement with the valve needle assembly.

12. The electronic expansion valve of claim 11, wherein the valve needle assembly comprises a valve needle and a valve needle sleeve connected to the valve needle, and the extension is sleeved on the periphery of the valve needle sleeve and is in guiding fit with the valve needle sleeve and the valve needle.

13. Refrigeration device, comprising an electronic expansion valve according to any of claims 1 to 12.