Electronic expansion valve and refrigeration equipment

Abstract

The present invention discloses an electronic expansion valve and a refrigeration device. The electronic expansion valve includes a valve housing, a valve core seat and a nut. The valve core seat is installed in the valve housing, and a valve port is formed on the valve core seat. The nut is installed on the valve housing, and a sound-absorbing gap is provided between the nut and the valve core seat. The electronic expansion valve of the present invention can effectively reduce noise and reduce the risk of valve needle jamming, improving the use effect of the electronic expansion valve.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and particularly to an electronic expansion valve for regulating fluid flow rate and a refrigeration device. Background Art

[0002] In a refrigeration cycle system, an electronic expansion valve is usually arranged 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 gas is often mixed in the liquid refrigerant, the sound of bubble rupture will occur after the refrigerant flows through the valve port, so that the electronic expansion valve will generate noise during use.

[0003] The above content is only used to assist in understanding the technical solution of the invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to propose an electronic expansion valve and a refrigeration device, aiming to reduce the noise generated during the use of the electronic expansion valve.

[0005] To achieve the above object, the electronic expansion valve proposed by the present invention includes a valve housing, a valve core seat and a nut;

[0006] The valve core seat is installed on the valve housing, and a valve port is formed on the valve core seat;

[0007] The nut is installed on the valve housing, and a sound-absorbing gap is provided between the nut and the valve core seat.

[0008] In one embodiment, the nut has an extension portion extending towards the valve port, and the end face of the extension portion facing the valve core seat is spaced from the end face of the valve core seat facing the extension portion to form the sound-absorbing gap.

[0009] In one embodiment, the valve core seat includes a seat body and an annular flange protruding from the end face of the seat body facing the extension portion, and the end face of the extension portion facing the valve core seat is spaced from the end face of the annular flange facing the extension portion to form the sound-absorbing gap.

[0010] 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 less than or equal to the inner diameter of the valve port in other cross-sections, and the gap value of the sound-absorbing gap is less than or equal to the inner diameter of the valve port in the first cross-section.

[0011] In one embodiment, a valve cavity is defined in the valve housing, the extension portion is located in the valve cavity, the outer wall surface of the extension portion is spaced from the inner wall surface of the valve cavity to form a medium flow cavity, a valve core installation cavity is defined inside the extension portion, and a flow port communicating the medium flow cavity and the valve core installation cavity is provided on the wall surface of the extension portion.

[0012] In one embodiment, the flow port is a flow port or a flow notch formed in the extension portion.

[0013] 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 less than or equal to the inner diameter of the valve port in other cross-sections, and the maximum length dimension of the flow port is less than or equal to the inner diameter of the valve port in the first cross-section.

[0014] In one embodiment, the valve housing includes a valve seat, an installation port is formed in the valve seat, the valve core seat is installed at the installation port, and the nut is installed on a side of the valve seat away from the installation port.

[0015] In one embodiment, the valve seat is provided with a valve cavity and an interface communicating with the valve cavity. One end of the valve port communicates with the valve cavity, and the other end is used for communicating with a medium outflow pipe. The interface is used for connecting a medium inflow pipe, and the extension portion extends towards the valve port to extend beyond the axis of the interface.

[0016] In one embodiment, the extension portion extends towards the valve port to extend beyond the inner wall surface of the interface close to the valve port.

[0017] In one embodiment, the electronic expansion valve further includes a valve needle assembly. The extension portion is sleeved on the periphery of the valve needle assembly and is in guiding cooperation with the valve needle assembly.

[0018] In one embodiment, the valve needle assembly includes a valve needle and a valve needle sleeve connected to the valve needle. The extension portion is sleeved on the periphery of the valve needle sleeve and is in guiding cooperation with the valve needle sleeve and the valve needle.

[0019] The present invention also provides a refrigeration device, which includes an electronic expansion valve. The electronic expansion valve includes a valve housing, a valve core seat and a nut;

[0020] The valve core seat is installed in the valve housing, and a valve port is formed on the valve core seat;

[0021] The nut is installed on the valve housing, and a sound-absorbing gap is provided between the nut and the valve core seat.

[0022] In one embodiment, the nut has an extension portion extending towards the valve port. The end face of the extension portion facing the valve core seat and the end face of the valve core seat facing the extension portion are spaced apart to form the sound-absorbing gap.

[0023] In the electronic expansion valve of the present invention, the valve core seat is installed on the valve housing, and a valve port is formed on the valve core seat; the nut is installed on the valve housing, and a sound-absorbing gap is provided between the nut and the valve core seat. In this way, when the refrigerant between the outer wall surface of the nut and the inner wall surface of the valve cavity flows into the sound-absorbing gap, the flow diameter changes from large to small, and the bubbles are squeezed and broken in the sound-absorbing gap, instead of becoming larger and breaking at the valve port to generate a blasting sound, thus playing a role in eliminating the sound of the bubbles; at the same time, due to the blocking of the nut and / or the valve core seat, the refrigerant will not directly impact the valve needle greatly, and the flow direction of the refrigerant can be changed through the sound-absorbing gap, playing a role in buffering and stabilizing the flow, thereby reducing the impact noise of the refrigerant and the phenomenon of valve needle jamming. In addition, compared with the embodiment in which the nut abuts against the valve core seat and a flow port is opened on the nut, since the sound-absorbing gap is circumferentially connected, when the bubbles flow into the sound-absorbing gap, they can also extend and break circumferentially. Compared with the bubbles breaking through the flow port, the probability of the bubbles bursting at the valve port can be greatly reduced, and the sound-absorbing and noise-reducing effect is better. Moreover, the sound-absorbing gap has a larger flow area than the flow port, so that the refrigerant flow rate from the valve cavity to the valve port can be effectively increased, the fluid frictional resistance along the way can be reduced, and the use effect of the electronic expansion valve can be improved. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the electronic expansion valve of the present invention;

[0026] Figure 2 It is Figure 1 a cross-sectional view of the electronic expansion valve in [the figure], where the valve needle is in the state of opening the valve port;

[0027] Figure 3 It is Figure 2 a partial enlarged view of part A in [the figure];

[0028] Figure 4 It is Figure 1 a cross-sectional view of the electronic expansion valve in [the figure], where the valve needle is in the state of closing the valve port;

[0029] Figure 5 It is Figure 4 a partial enlarged view of part B in [the figure].

[0030] Explanation of the reference numerals in the drawings:

[0031]

[0032]

[0033] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in Figure 1 the specific posture shown. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] The present invention provides an electronic expansion valve, which is applied to a refrigeration system. The refrigeration system can be the refrigeration system of an air conditioner, a chiller, a refrigerator, a heat pump water heater or other refrigeration and heating equipment. Then the electronic expansion valve can control the flow rate of the refrigerant in the refrigeration system.

[0038] In the embodiments of the present invention, as Figures 1 to 5As shown, the electronic expansion valve includes a valve housing 100, a valve core seat 200, and a nut 300. The valve core seat 200 is installed in the valve housing 100, and a valve port 210 is formed on the valve core seat 200. The nut 300 is installed in the valve housing 100, and a sound-absorbing gap 400 is provided between the nut 300 and the valve core seat 200 (as Figure 3 shown in h).

[0039] In this embodiment, the valve housing 100 may specifically include a valve seat 110 and an outer shell 130. The outer shell 130 is connected to the valve seat 110 to hermetically accommodate the valve core assembly inside. When the nut 300 is installed on the valve housing 100, the nut 300 may specifically be installed on the outer shell 130, or on the valve seat 110, or on both the outer shell 130 and the valve seat 110 at the same time. The nut 300 and the valve housing 100 may be connected to each other by means of connectors, interference fits, snap connections, etc. The nut 300 may be injection-molded from engineering plastics. This electronic expansion valve specifically further includes a magnetic ring assembly and a valve core assembly disposed inside the valve housing 100. The valve core assembly includes a valve stem 530 and a valve needle 510. The valve needle 510 is inserted into the valve port 210. The valve stem 530 is in threaded cooperation with the nut 300, and the valve stem 530 is drivingly connected to the valve needle 510. The magnetic ring assembly includes a magnetic ring, a fixing plate, and a guiding rod. The fixing plate connects the magnetic ring and the stopping rod. One end of the valve stem 530 away from the valve port 210 passes through the middle of the fixing plate. Then, after the electronic expansion valve is powered on, the valve stem 530 is driven to rotate by the magnetic ring assembly, and the valve stem 530 is driven to move up and down through the threaded cooperation between the valve stem 530 and the nut 300, thereby realizing the opening and closing of the valve port 210 by the valve needle 510 to adjust the flow rate of the refrigerant.

[0040] The valve core seat 200 may specifically be installed on the valve seat 110. Then, the valve core seat 200 and the valve seat 110 may be integrally formed or separately formed. The inner cavity of the valve seat 110 forms a valve cavity 111. One end of the valve port 210 communicates with the valve cavity 111, and the other end communicates with the medium outflow pipe 600. It can be understood that one side of the valve cavity 111 also communicates with the medium inflow pipe 700. Then, the refrigerant flows into the valve cavity 111 from the medium inflow pipe 700. When the valve needle 510 opens the valve port 210, it flows through the valve port 210 to the medium outflow pipe 600. Of course, the refrigerant can also flow in the reverse direction, that is, the refrigerant can 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.

[0041] It can be understood that if a sound - damping gap 400 is provided between the nut 300 and the valve core seat 200, then it can be arranged such that only the lower end of the nut 300 extends towards the valve core seat 200, or only the upper end of the valve core seat 200 extends towards the nut 300, or the lower end of the nut 300 extends towards the valve core seat 200 while the upper end of the valve core seat 200 extends towards the nut 300. It is only necessary that the gap between the lower end of the nut 300 and the upper end of the valve core seat 200 is small to form this sound - damping gap 400, and no specific limitation is made here. A sound - damping 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 without contact. It should be noted that a sound - damping gap 400 is formed between the nut 300 and the valve core seat 200. Using the throttling principle, the refrigerant located between the outer wall surface of the nut 300 and the inner wall surface of the valve cavity 111 can flow through this sound - damping gap 400 towards the valve port 210. Since gas is usually mixed in the liquid refrigerant, bubbles will be generated. By providing a sound - damping gap 400 between the nut 300 and the valve core seat 200, when the refrigerant between the outer wall surface of the nut 300 and the inner wall surface of the valve cavity 111 flows into this sound - damping gap 400, the flow - through diameter changes from large to small, and the bubbles are squeezed and broken in this sound - damping gap 400, rather than growing and breaking at the valve port 210 to generate a blasting sound, thus playing a role in silencing the bubbles. At the same time, due to the blockage of the nut 300 and / or the valve core seat 200, the refrigerant will not directly impact the valve needle 510 greatly, and the flow direction of the refrigerant can be changed through this sound - damping gap 400, playing a role in buffering and stabilizing the flow, thereby reducing the impact noise of the refrigerant and preventing the valve needle 510 from jamming. In addition, compared with the embodiment in which the nut 300 abuts against the valve core seat 200 and a flow - through port 312 is opened on the nut 300, since the sound - damping gap 400 is circumferentially connected, when the bubbles flow into the sound - damping gap 400, they can also extend and break circumferentially. Compared with the bubbles breaking through the flow - through port 312, the probability of the bubbles bursting at the valve port 210 can be greatly reduced, and its sound - damping and noise - reduction effect is better. And the flow - through area of the sound - damping gap 400 is larger than that of the flow - through port 312, so that the refrigerant flow rate from the valve cavity 111 to the valve port 210 can be effectively increased, the fluid frictional resistance along the way can be reduced, and further the use effect of the electronic expansion valve can be improved.

[0042] In the electronic expansion valve of the present invention, the valve core seat 200 is installed in the valve housing 100, and a valve port 210 is formed on the valve core seat 200; the nut 300 is installed on the valve housing 100, and a silencing gap 400 is provided between the nut 300 and the valve core seat 200. In this way, 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 diameter changes from large to small, and the bubbles are squeezed and broken in the silencing gap 400, instead of becoming larger and breaking at the valve port 210 to generate a blasting sound, thereby playing a role in silencing the bubbles; at the same time, due to the blockage of the nut 300 and / or the valve core seat 200, the refrigerant will not directly impact the valve needle 510 greatly, and the flow direction of the refrigerant can be changed through the silencing gap 400, playing a role in buffering and stabilizing the flow, and further reducing the impact noise of the refrigerant and the jamming phenomenon of the valve needle 510. In addition, compared with the embodiment in which the nut 300 abuts against the valve core seat 200 and a flow port 312 is provided on the nut 300, since the silencing gap 400 is circumferentially connected, when the bubbles flow into the silencing gap 400, they can also extend and break circumferentially. Compared with the bubbles breaking through the flow port 312, the probability of the bubbles bursting at the valve port 210 can be greatly reduced, and the silencing and noise reduction effect is better. And the flow area of the silencing gap 400 is larger than that of the flow port 312, so that the refrigerant flow rate from the valve cavity 111 to the valve port 210 can be effectively increased, the fluid frictional resistance along the way can be reduced, and the use effect of the electronic expansion valve can be improved.

[0043] In one embodiment, please refer to Figures 2 to 5 , the nut 300 has an extension portion 310 extending towards the valve port 210, and the end surface of the extension portion 310 facing the valve core seat 200 is spaced from the end surface of the valve core seat 200 facing the extension portion 310 to form the silencing gap 400.

[0044] In this embodiment, it can be understood that the end face of the extension portion 310 facing the valve element seat 200 and the end face of the valve element seat 200 facing the extension portion 310 are arranged at intervals, and there are many ways to form the sound absorption gap 400. In one embodiment, the lower end face of the extension portion 310 is located above the upper end face of the valve element seat 200. That is, the lower end face of the extension portion 310 and the upper end face of the valve element seat 200 form the sound absorption gap 400 in the up-down direction. In another embodiment, the lower end face of the extension portion 310 is flush with the upper end face of the valve element seat 200, and the extension portion 310 surrounds the outer periphery of the valve element seat 200, so that the lower end face of the extension portion 310 and the upper end face of the valve element seat 200 form the sound absorption gap 400 in the horizontal direction. In still another embodiment, the extension portion 310 surrounds the outer periphery of the valve element seat 200, and the lower end face of the extension portion 310 is located below the upper end face of the valve element seat 200. The extension portion 310 and the valve element seat 200 are arranged offset in the up-down direction to form the sound absorption gap 400. By making the extension portion 310 of the nut 300 extend toward the valve port 210, so that a sound absorption gap 400 is formed between the end face of the extension portion 310 facing the valve element seat 200 and the end face of the valve element seat 200 facing the extension portion 310, compared with making the valve element seat 200 extend toward the nut 300, the gap between the end face of the valve element seat 200 and the bottom wall of the valve cavity 111 can be reduced, thereby reducing the storage flow rate of the refrigerant between the outer wall surface of the valve element seat 200 and the bottom wall of the valve cavity 111, and further improving the refrigerant flow rate of the electronic expansion valve. At the same time, compared with extending the length of the valve element seat 200, the processing method of extending the length of the nut 300 is simpler, so the manufacturing cost can be reduced, and it is easier to install the valve element seat 200 and the valve housing 100.

[0045] On the basis of the above embodiments, further, as Figure 5 shown, the valve element seat 200 includes a seat body 220 and an annular flange 230 protruding from the end face of the seat body 220 facing the extension portion 310. The end face of the extension portion 310 facing the valve element seat 200 and the end face of the annular flange 230 facing the extension portion 310 are arranged at intervals to form the sound absorption gap 400 (as Figure 3 shown in h). Specifically, the end face of the extension portion 310 facing the valve element seat 200 is located above the end face of the annular flange 230 facing the extension portion 310.

[0046] In this embodiment, by providing an annular flange 230 on the seat body 220, a stepped surface is formed between the upper end surface of the annular flange 230 and the seat body 220. And a 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 annular flange 230 facing the extension portion 310. Then, the gap between the end surface of the extension portion 310 of the nut 300 facing the valve core seat 200 and the upper end surface of the seat body 220 is greater 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 towards the valve core seat 200, it first passes through the gap between the seat body 220 and the extension portion 310 of the nut 300, undergoes primary deceleration, performs slow flow and steady flow, reduces the impact noise of the refrigerant, and at the same time, the bubbles are subjected to primary extrusion and fragmentation through this gap, reducing the volume of the bubbles flowing towards the silencing gap 400. Subsequently, the refrigerant continues to flow from the silencing gap 400 towards the valve port 210, undergoes secondary deceleration, performs slow flow and steady flow again, further reduces the impact noise of the refrigerant, and at the same time, the bubbles are subjected to secondary extrusion and fragmentation through the silencing gap 400, further reducing the probability of the bubbles breaking at the valve port 210, greatly reducing the bursting noise of the bubbles. In this way, the refrigerant flows into the valve port 210 after secondary deceleration and secondary extrusion and fragmentation of the bubbles, avoiding the direct impact of the refrigerant on the valve needle 510 and avoiding the generation of bursting noise when the air flow reaches the valve port 210, thereby effectively and reliably performing slow flow and steady flow on the refrigerant, minimizing the impact noise and bubble bursting noise of the electronic expansion valve to a great extent, and greatly improving the use comfort of the electronic expansion valve. Of course, it is also possible to make the gap between the end surface of the extension portion 310 of the nut 300 facing the valve core seat 200 and the upper end surface of the seat body 220 be the silencing gap 400, and this silencing gap 400 is less than or equal to the minimum inner diameter of the valve port 210. This can further reduce the noise of the electronic expansion valve.

[0047] In one embodiment, please refer to Figure 3 and Figure 5 , the valve core seat 200 has a first cross-section, and the inner diameter (such as Figure 3 shown as D) of the valve port 210 in the first cross-section is less than or equal to the inner diameter of the valve port 210 in other cross-sections. The gap value (such as Figure 3 shown as h) of the silencing gap 400 is less than or equal to the inner diameter (such as Figure 3 shown as D) of the valve port 210 in the first cross-section. That is, the gap value of the silencing gap 400 is less than or equal to the minimum inner diameter of the valve port 210.

[0048] In this 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 usually designed as a conical hole, and the constriction of the conical hole is arranged close to the nut 300. By making the inner diameter of the valve port 210 at the first cross-section less than or equal to the inner diameter of the valve port 210 at other cross-sections, that is, the inner diameter of the valve port 210 at the first cross-section is the minimum inner diameter of the entire valve port 210. When the valve port 210 is designed as a cylindrical hole, the inner diameter of the valve port 210 at the first cross-section is equal to the inner diameter of the valve port 210 at other cross-sections. When the valve port 210 is designed as a conical hole, when a large air bubble flows to the valve port 210, it will directly burst and generate a popping sound. When the diameter of the air bubble is equal to the diameter of the constriction of the valve port 210, the air bubble continues to flow after flowing to the constriction of the valve port 210. Since the aperture of the valve port 210 increases from small to large, the volume of the air bubble will gradually increase, and then it will burst at the valve port 210 to generate a bursting noise. When the diameter of the air bubble is less than the diameter of the constriction of the valve port 210, it will not burst and no noise will be generated. By making the clearance value h of the sound-absorbing gap 400 less than or equal to the inner diameter D of the valve port 210 at the first cross-section, that is, the clearance value of the sound-absorbing gap 400 is less than or equal to the minimum inner diameter D of the valve port 210, the air bubbles equal to the minimum inner diameter of the valve port 210 and the large air bubbles can be effectively squeezed and broken, and the large-volume air bubbles can be comprehensively and effectively prevented from flowing to the valve port 210 to burst and generate noise.

[0049] In one embodiment, as Figures 2 to 5 shown, a valve cavity 111 is defined in the valve housing 100, the extension portion 310 is located in the valve cavity 111, and an outer wall surface of the extension portion 310 is spaced from an inner wall surface of the valve cavity 111 to form a medium flow cavity 120. A valve core installation cavity 311 is defined inside the extension portion 310, and a communication port 312 communicating the medium flow cavity 120 and the valve core installation cavity 311 is formed on a wall surface of the extension portion 310.

[0050] In this embodiment, the flow port 312 can be set to one or multiple. The shape of the flow port 312 can be circular, semi-circular, elliptical, semi-elliptical, rectangular, triangular, polygonal, irregular, etc. By setting the outer wall surface of the extension portion 310 at an interval from the inner wall surface of the valve cavity 111 to form the medium flow cavity 120, when the refrigerant medium flows into the valve cavity 111 from the medium inlet pipe 700, due to the blocking effect of the wall surface of the extension portion 310, slow flow and stable flow are carried out in the medium flow cavity 120, thereby further avoiding the refrigerant directly impacting the valve needle 510 and causing abnormal noise and jamming of the valve needle 510. The inner side of the extension portion 310 defines a valve core installation cavity 311 for guiding and assembling the valve needle 510. By providing a flow port 312 on the wall surface of the extension portion 310 that communicates the medium flow cavity 120 and the valve core installation cavity 311, the medium flow rate of the electronic expansion valve can be further improved. At the same time, the flow port 312 can also squeeze and break the bubbles, thereby further avoiding the noise generated by the bubbles bursting at the valve port 210 and effectively improving the performance of the electronic expansion valve. To improve the medium flow rate of the electronic expansion valve, in one embodiment, a plurality of flow ports 312 are provided on the wall surface of the extension portion 310, and the plurality of flow ports 312 are circumferentially spaced on the extension portion 310. Specifically, the plurality of flow ports 312 can be evenly circumferentially spaced on the extension portion 310, thereby improving the flow uniformity of the refrigerant. In other embodiments, the extension portion 310 may not be provided with a flow port 312.

[0051] Further, please refer to Figure 3 and Figure 5 , the flow port 312 is a flow hole or a flow notch opened on the extension portion 310. To make the effect of the flow port 312 for flowing the refrigerant medium better, the flow port 312 can be opened at the end of the extension portion 310 close to the valve core seat 200. When the flow port 312 is a flow hole, it is a complete hole opened on the wall surface of the extension portion 310, and the shape of the flow hole can be circular, semi-circular, elliptical, semi-elliptical, rectangular, triangular, polygonal, irregular, etc. When the flow port 312 is a flow notch, the flow port 312 is a notch 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 notch is open. In this way, the lower end surface of the flow notch is communicated with the sound absorption gap 400, which can effectively increase the flow rate of the refrigerant. The flow notch can specifically be semi-elliptical, semi-circular, etc.

[0052] In one embodiment, as Figure 3 shown, the maximum length dimension of the flow port 312 (as Figure 3 shown L) is less than or equal to the inner diameter of the valve port 210 in the first cross-section (as Figure 3As shown in D). The maximum length dimension of the flow port 312 refers to the longest length from one point to another on the inner wall surface of the flow port 312. When the flow port 312 is circular, the maximum length dimension is the diameter of the circular flow port 312. When the flow port 312 is elliptical, the maximum length dimension is the major axis dimension of the elliptical flow port 312. When the flow port 312 is rectangular, the maximum length dimension is the diagonal length dimension of the rectangle. When the flow port 312 has other shapes, the same principle applies and will not be listed one by one here. By making the maximum length dimension of the flow port 312 less than or equal to the inner diameter of the valve port 210 in the first cross-section, that is, making the maximum length dimension of the flow port 312 less than or equal to the minimum inner diameter of the valve port 210, in this way, while increasing the refrigerant flow rate of the electronic expansion valve through the flow port 312, the large air bubbles can be broken by the flow port 312, thereby avoiding the bursting of the air bubbles at the valve port 210 to form blasting noise.

[0053] Furthermore, the flow port 312 is a flow notch, and the sum of the length dimension of the flow notch in the axial direction of the extension part 310 and the gap between the lower end surface of the extension part 310 and the upper end surface of the valve core seat 200 is less than or equal to the inner diameter of the valve port 210 in the first cross-section. In this way, the sum of the flow notch and the gap between the lower end surface of the extension part 310 and the upper end surface of the valve core seat 200 is less than or equal to the minimum inner diameter of the valve port 210, so that large air bubbles can be prevented from passing through, achieving a comprehensive and effective prevention of the bursting of large air bubbles at the valve port 210, and further reducing the operating noise of the electronic expansion valve.

[0054] Specifically, as Figure 2 and Figure 4As shown, the valve housing 100 includes a valve seat 110, an installation opening 112 is provided on the valve seat 110, the valve core seat 200 is installed at the installation opening 112, and the nut 300 is installed on one side of the valve seat 110 away from the installation opening 112. The valve core seat 200 and the valve seat 110 can be specifically connected by welding to ensure the sealing reliability between the valve core seat 200 and the valve seat 110. In other embodiments, the valve seat 110 and the valve core seat 200 can also be integrally formed. By installing the nut 300 on one side of the valve seat 110 away from the installation opening 112, compared with installing the nut 300 on the outer shell 130, the installation of the nut 300 on the side closer to the valve port 210 is more stable, which can effectively avoid the shaking of the extension part 310 of the nut 300, thereby avoiding the problems of eccentricity and friction between the extension part 310 of the nut 300 and the valve core assembly. Furthermore, it can avoid the jamming phenomenon of the valve core assembly due to coaxiality when moving in the nut 300, and can effectively reduce the overall noise of the electronic expansion valve and improve the overall service life. Specifically, an annular metal connecting piece can be embedded in the nut 300 and fixed to the valve seat 110 through this annular metal connecting piece. The nut 300 can be made of plastic material, and engineering resin can be selected and integrally injection-molded with the annular metal connecting piece. A positioning part can also be provided on the nut 300 to make the positioning part in interference fit with the inner wall surface of the valve seat 110. In this way, the axial movement of the nut 300 is restricted by the annular metal connecting piece, and the circumferential rotation of the nut 300 is limited by the interference fit of the positioning part, so that the connection between the nut 300 and the valve seat 110 is more stable, preventing the nut 300 from shaking or deflecting due to vibration.

[0055] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 4 , the valve seat 110 is provided with a valve cavity 111 and an interface 113 communicating with the valve cavity 111. One end of the valve port 210 communicates with the valve cavity 111, and the other end is used for communicating with the medium outflow pipe 600. The interface 113 is used for connecting the medium inflow pipe 700, and the extension part 310 extends towards the valve port 210 to extend beyond the axis of the interface 113.

[0056] In this embodiment, the valve cavity 111 is the inner cavity of the valve seat 110. Specifically, an interface 113 is provided on the side wall surface of the valve seat 110. The medium inflow pipe 700 is hermetically inserted into the interface 113. The medium outflow pipe 600 is inserted into the valve core seat 200 to realize the communication between the valve port 210 and the medium outflow pipe 600. Then, the refrigerant flows into the valve cavity 111 from 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 core seat 200, and then flows from the valve port 210 to the medium outflow pipe 600. It can be understood that by making the extension part 310 extend towards the valve port 210 to extend beyond the axis of the interface 113, when the refrigerant flows from the medium inflow pipe 700 to the valve cavity 111, due to the partial shielding of the outer wall surface of the extension part 310, the noise caused by the direct impact of the refrigerant on the valve needle 510 can be effectively avoided. At the same time, through the shielding of the extension part 310, the refrigerant is buffered and stabilized, and the refrigerant can pass more slowly through the sound-absorbing gap 400 between the extension part 310 and the valve core seat 200, thereby reducing the probability of the air flow flowing towards the valve port 210 and further reducing the noise of the electronic expansion valve.

[0057] Further, as Figure 2 and Figure 4 shown, the extension part 310 extends towards the valve port 210 to extend beyond the inner wall surface of the interface 113 close to the valve port 210. By making the extension part 310 extend towards the valve port 210 to extend beyond the inner wall surface of the interface 113 close to the valve port 210, the outer wall surface of the extension part 310 can play a complete oscillation role on the refrigerant flowing out of the medium inflow pipe 700, and the refrigerant can be completely prevented from flowing directly out of the medium inflow pipe 700 and impacting the valve needle 510. Therefore, when the refrigerant flows out of the medium outflow pipe 600, it will flow slowly and stably in the chamber between the outer wall surface of the extension part 310 and the inner wall surface of the valve cavity 111, so as to ensure that the refrigerant flows uniformly and slowly from the sound-absorbing gap 400 to the valve port 210, thereby improving the blocking and crushing effect of the sound-absorbing gap 400 on the bubbles and effectively reducing the overall noise.

[0058] In one embodiment, as Figure 2 and Figure 4As shown, the electronic expansion valve further includes a valve needle assembly 500. The extension portion 310 is sleeved on the periphery of the valve needle assembly 500 and is in guiding cooperation with the valve needle assembly 500. By sleeving the extension portion 310 on the periphery of the valve needle assembly 500 and being in guiding cooperation with the valve needle assembly 500, the extension portion 310 can be used to guide the valve needle assembly 500, so that there is no need to separately provide a guide sleeve or make the valve core seat 200 extend upward to form a guide sleeve. Furthermore, the number of components can be reduced and the overall structure can be simplified. While reducing noise by the extension portion 310, it also plays a guiding role for the valve core assembly. In addition, due to the high connection stability of the nut 300, the extension portion 310 of the nut 300 guides the valve needle 510. Since the valve stem 530 is also guided by the nut 300, the coaxiality of the valve stem 530, the valve needle 510, and the nut 300 can be better guaranteed, resulting in a higher overall coaxiality. Furthermore, the operating accuracy of the entire electronic expansion valve is higher, the use is smoother, and the jamming probability of the valve needle 510 is further reduced.

[0059] Further, the valve needle assembly 500 includes a valve needle 510 and a valve needle sleeve 520 connected to the valve needle 510. The extension portion 310 is sleeved on the periphery of the valve needle sleeve 520 and is in guiding cooperation with the valve needle sleeve 520 and the valve needle 510. The valve needle sleeve 520 and the valve needle 510 can be connected by interference fit. The valve needle sleeve 520 is interference-fitted on the periphery of the valve needle 510. By sleeving the extension portion 310 on the periphery of the valve needle sleeve 520, it can prevent the refrigerant from directly impacting the valve needle 510, and the extension portion 310 is in guiding cooperation with the valve needle sleeve 520 and the valve needle 510, so that the valve needle sleeve 520 and the valve needle 510 can be guided simultaneously. Furthermore, the coaxiality among the valve needle sleeve 520, the valve needle 510, the valve stem 530, and the nut 300 is guaranteed, and the eccentricity problem is avoided, thereby reducing the jamming risk of the valve needle 510. By separately providing the valve needle 510 and the valve needle sleeve 520, it is more convenient for the injection molding of the valve needle 510, so that the top surface of the valve needle 510 can be injection-molded more smoothly, and the friction between the valve needle 510 and the buffer slider can be reduced. In other embodiments, the valve needle 510 and the valve needle sleeve 520 can also be integrally formed.

[0060] In one embodiment, please refer to again Figure 2 and Figure 4, the valve needle assembly 500 includes a valve needle sleeve 520, a valve stem 530, a valve needle 510, a buffer slider, and a buffer spring. The valve needle sleeve 520 has opposite first and second open ends; the valve stem 530 has an operating end, the valve stem 530 is disposed through the first open end, and the operating end of the valve stem 530 is disposed within the valve needle sleeve 520; the valve needle 510 is installed at the second open end of the valve needle sleeve 520; the buffer slider is disposed within the valve needle sleeve 520, and the buffer slider abuts against the valve needle 510; the buffer spring is disposed within the valve needle sleeve 520, and the operating end of the valve stem 530 is connected to the buffer slider through the buffer spring.

[0061] Specifically, the nut 300 is provided with a mounting hole extending along its axial direction, and the valve stem 530 is disposed through the mounting hole and rotatably connected to the nut 300. The valve stem 530 includes a guide rod section and a threaded rod section, the mounting hole includes a guide hole section adapted to the guide rod section and a threaded hole section adapted to the threaded rod section, an interference fit or a clearance fit is provided between the guide rod section and the guide hole section, and a threaded fit is provided between the threaded rod section and the threaded hole section.

[0062] The valve needle assembly 500 may be composed only of a valve needle sleeve 520, a valve stem 530, a valve needle 510, a buffer slider, and a buffer spring, which enables the valve needle assembly 500 to have fewer components, thus achieving the effect of cost savings, but is not limited thereto. The valve stem 530, the nut 300, and the valve needle 510 are coaxially arranged. The valve stem 530 has an operating end close to the valve needle 510. The valve stem 530 passes through the first open end of the valve needle sleeve 520, and the operating end of the valve stem 530 is located within the valve needle sleeve 520. The operating end of the valve stem 530 has a clearance fit with the first open end of the valve needle sleeve 520, so that the valve stem 530 can move axially relative to the valve needle sleeve 520. The valve needle 510 is installed at the second open end of the valve needle sleeve 520, and the valve needle 510 has an interference fit with the second open end of the valve needle sleeve 520. Both the buffer spring and the buffer slider are located within the valve needle sleeve 520. The buffer slider is opposite to and spaced from the operating end of the valve stem 530. The buffer spring is disposed between the buffer slider and the operating end of the valve stem 530 to connect the buffer slider and the operating end of the valve stem 530. Specifically, the buffer spring is a compression spring. Thus, when the valve stem 530 moves axially relative to the valve needle sleeve 520, the valve stem 530 can drive the buffer slider to rotate through the buffer spring, while the valve needle 510 remains stationary, avoiding the valve needle 510 rotating relative to the valve port 210 and causing wear. After the valve stem 530 moves axially to abut against the valve needle sleeve 520, the valve stem 530 can drive the valve needle 510 to move together through the valve needle sleeve 520, thereby realizing the control of the opening degree of the valve port 210, that is, realizing the control of the flow rate of the electronic expansion valve. Optionally, the valve stem 530, the buffer spring, the buffer slider, and the valve needle sleeve 520 are coaxially arranged, which can ensure good coaxiality of the valve core assembly.

[0063] In an embodiment of the present invention, the buffer slider abuts against the valve needle 510, enabling the buffer slider to rotate relative to the valve needle 510, which can avoid the valve needle 510 rotating relative to the valve port 210 and the valve needle sleeve 520 rotating relative to the mounting hole of the nut 300, thereby avoiding wear of the valve needle 510 and the valve needle sleeve 520. The buffer slider can be made of a material with high lubricity, which can reduce the friction force between the buffer slider and the valve needle 510, thereby reducing the wear caused when the buffer slider rotates relative to the valve needle 510. Optionally, the buffer slider is made of a non-metallic material. For example, but not limited to, the buffer slider is made of a plastic material. By using a non-metallic buffer slider, the friction force between the buffer slider and the valve needle 510 made of a metal material can be reduced, and further the wear caused when the buffer slider rotates relative to the valve needle 510 can be reduced.

[0064] The present invention also provides a refrigeration device, which includes an electronic expansion valve. For the specific structure of the electronic expansion valve, reference may be made to the above embodiments. Since this refrigeration device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. This refrigeration device can be an air conditioner, a chiller, a refrigerator, a heat pump water heater or other refrigeration and heating devices. Then, the electronic expansion valve can control the flow rate of the refrigerant in the refrigeration system.

[0065] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any 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, characterized in that, Comprising: A valve housing including a connected valve seat and an outer shell; A valve core seat installed on the valve seat of the valve housing, with a valve port formed on the valve core seat; and A nut installed on the valve seat of the valve housing, with a sound-absorbing gap provided between the nut and the valve core seat; The nut has an extension portion extending towards the valve port, and the end face of the extension portion facing the valve core seat and the end face of the valve core seat facing the extension portion are spaced apart to form the sound-absorbing gap; A valve cavity is defined within the valve housing, the extension portion is located within the valve cavity, and the outer wall surface of the extension portion is spaced apart from the inner wall surface of the valve cavity to form a medium flow cavity. A valve core installation cavity is defined inside the extension portion, and a flow port communicating the medium flow cavity and the valve core installation cavity is provided on the wall surface of the extension portion.

2. The electronic expansion valve according to claim 1, characterized in that, The valve core seat includes a seat body and an annular flange protruding from the end face of the seat body facing the extension portion. The end face of the extension portion facing the valve core seat and the end face of the annular flange facing the extension portion are spaced apart to form the sound-absorbing gap.

3. The electronic expansion valve according to any one of claims 1 to 2, characterized in that, The valve core seat has a first cross-section, and the inner diameter of the valve port in the first cross-section is less than or equal to the inner diameter of the valve port in other cross-sections. The gap value of the sound-absorbing gap is less than or equal to the inner diameter of the valve port in the first cross-section.

4. The electronic expansion valve according to claim 1, wherein, The flow port is a flow hole or a flow notch provided on the extension portion.

5. The electronic expansion valve according to claim 1, wherein The valve core seat has a first cross-section, and the inner diameter of the valve port in the first cross-section is less than or equal to the inner diameter of the valve port in other cross-sections. The maximum length dimension of the flow port is less than or equal to the inner diameter of the valve port in the first cross-section.

6. The electronic expansion valve according to claim 1, wherein, The valve housing includes a valve seat, an installation opening is provided on the valve seat, the valve core seat is installed at the installation opening, and the nut is installed on the side of the valve seat away from the installation opening.

7. The electronic expansion valve according to claim 6, characterized in that, The valve seat is provided with a valve cavity and an interface communicating with the valve cavity. One end of the valve port communicates with the valve cavity, and the other end is for connecting with a medium outflow pipe. The interface is for connecting a medium inflow pipe, and the extension portion extends towards the valve port to exceed the axis of the interface.

8. The electronic expansion valve according to claim 7, characterized in that, The extension portion extends towards the valve port to exceed the inner wall surface of the interface close to the valve port.

9. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a valve needle assembly, and the extension portion is sleeved around the valve needle assembly and is in guiding cooperation with the valve needle assembly.

10. The electronic expansion valve according to claim 9, wherein The valve needle assembly includes a valve needle and a valve needle sleeve connected to the valve needle. The extension portion is sleeved around the valve needle sleeve and is in guiding cooperation with the valve needle sleeve and the valve needle.

11. A refrigeration device, characterized in that, Including the electronic expansion valve according to any one of claims 1 to 10.

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