Electronic expansion valve and refrigeration equipment

Abstract

According to the technical scheme, the electronic expansion valve comprises a valve port assembly and a valve rod, the valve port assembly is provided with a valve cavity and a valve port, the valve port is provided with an upper port communicated with the valve cavity, and the periphery of the upper port is chamfered; the valve rod extends into the valve port assembly and is used for opening and closing the valve port; a conical surface is formed on the side wall of the valve rod, and when the valve rod stretches into the valve port, the conical surface abuts against the round corner of the upper port. According to the technical scheme of the utility model, the periphery of the upper port of the valve port is finely machined into the fillet with higher smoothness by using the finishing cutter, so that the consistency and the sealing property are better when the conical surface of the valve rod is propped against the fillet of the upper port, thereby effectively reducing the internal leakage of the electronic expansion valve and improving the energy efficiency of a system.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to an electronic expansion valve and a refrigeration device. Background Art

[0002] The valve needle and the valve port form an internal leakage line seal to achieve the switch and flow regulation of the electronic expansion valve. At present, the sealing line of the valve port is a chamfered linear sealing line, which is cut to form a line seal with the conical surface of the valve needle. Since the sealing part of the valve port will form a spiral processing knife mark during the cutting process, and the tool is prone to forming flange burrs during the processing, the internal leakage of the electronic expansion valve exceeds the standard, affecting the energy efficiency of the system. Utility Model Content

[0003] The main purpose of the utility model is to provide an electronic expansion valve, aiming to effectively reduce the internal leakage of the electronic expansion valve and improve the energy efficiency of the system.

[0004] The technical solution of the utility model provides an electronic expansion valve, comprising:

[0005] A valve port assembly, the valve port assembly comprising a valve cavity and a valve port, the valve port comprising an upper port communicating with the valve cavity, and a peripheral chamfer of the upper port being arranged;

[0006] A valve stem extends into the valve port assembly and is used to open and close the valve port; a conical surface is formed on the side wall of the valve stem, and when the valve port is closed, the conical surface abuts against the rounded corner of the upper port.

[0007] In one embodiment, the conical surface of the valve stem is a straight surface that slopes inward from top to bottom.

[0008] In one embodiment, the radius of the rounded corner of the upper port is R, and R≥0.05 mm.

[0009] In one embodiment, R≤0.2 mm.

[0010] In one embodiment, the valve port further has a communication port, which is provided at the lower end of the upper port and communicates with the upper port, and the connection between the inner peripheral wall of the communication port and the fillet of the upper port is tangently transitioned.

[0011] In one embodiment, the valve port further has a lower port, the communication port is disposed between the upper port and the lower port and communicates with the lower port, and the lower port is arranged in a flared shape in a direction from the upper port to the communication port.

[0012] In one embodiment, the periphery of the lower port is rounded.

[0013] In one embodiment, at least one of the conical surface of the valve stem and the inner wall surface of the upper port is provided with a wear-resistant coating.

[0014] In one embodiment, the valve port assembly further comprises a plurality of flow ports communicating with the valve cavity, and the plurality of flow ports are spaced apart on the peripheral wall of the valve port assembly.

[0015] The utility model also provides a refrigeration device, which comprises the aforementioned electronic expansion valve.

[0016] The technical solution of the utility model uses a finishing tool to finish the periphery of the upper port of the valve port into a rounded corner with higher smoothness, so that when the conical surface of the valve stem abuts the rounded corner of the upper port, its consistency and sealing are better, thereby effectively reducing the internal leakage of the electronic expansion valve and improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of an electronic expansion valve in one embodiment of the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the middle valve port assembly;

[0021] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 Schematic diagram of the coordination of the finishing tool for the finishing processing of the valve port assembly.

[0023] Description of Figure Numbers:

[0024] Label name Label name 10 Electronic expansion valve 110 Valve cavity 100 Valve port assembly 120 Valve port 200 Valve stem 121 Upper port 210 tapered surface 122 Connecting port 130 Flow port 123 Lower port 20 Finishing tools

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] The electronic expansion valve proposed in the utility model can be applied to an air-conditioning system, and the fluid medium flowing through the electronic expansion valve is a refrigerant used for heat exchange in the air-conditioning system. At this time, the electronic expansion valve is installed at the inlet of the evaporator of the air-conditioning system. The electronic expansion valve serves as a dividing element between the high-pressure side and the low-pressure side of the air-conditioning system, throttling and reducing the pressure of the high-pressure liquid refrigerant from the liquid storage dryer and other devices, thereby adjusting and controlling the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can meet the requirements of the external refrigeration load. Alternatively, the electronic expansion valve is applied to other types of refrigeration equipment, and the fluid medium flowing through the electronic expansion valve can also be other fluid media besides the refrigerant, as long as the electronic expansion valve can achieve throttling and reducing the pressure of the fluid medium, and there is no specific restriction on this.

[0030] Please refer to Figure 1 and Figure 2The utility model proposes an electronic expansion valve 10, including a valve port assembly 100 and a valve stem 200. The valve port assembly 100 has a valve cavity 110 and a valve port 120. The valve port 120 has an upper port 121 connected to the valve cavity 110, and the upper port 121 has a chamfered corner. The valve stem 200 extends into the valve port assembly 100 to open and close the valve port 120. The side wall of the valve stem 200 is formed with a conical surface 210. When the valve port 120 is closed, the conical surface 210 abuts against the rounded corner of the upper port 121.

[0031] Specifically, the valve assembly 100 is roughly in the shape of a hollow stepped cylinder, and the valve assembly 100 has a valve cavity 110 inside, and the valve cavity 110 is used to install components such as the valve stem 200. The lower surface of the valve assembly 100 is provided with a valve port 120 connected to the valve cavity 110, and the side wall of the valve assembly 100 is provided with a flow port 130, and the valve port 120 and the flow port 130 are connected through the valve cavity 110, and the flow port 130 and the valve port 120 are used to connect the pipe to achieve the flow in and out of the refrigerant. By applying a certain regular electric pulse to the coil, the rotor assembly is stimulated to rotate, thereby driving the valve stem 200 to rotate and move up and down in the nut assembly, thereby driving the valve stem 200 to open and close the valve port 120, so as to realize the switch and flow regulation of the electronic expansion valve 10. When the valve port 120 is closed, the conical surface 210 formed by the side wall of the valve stem 200 abuts against the periphery of the upper port 121 of the valve port 120, and forms an internal leakage line seal.

[0032] Please refer to Figure 5 The upper port 121 of the valve port 120 is processed twice by coaxial fine grinding with a finishing tool 20, so that the periphery of the upper port 121 is rounded. The finishing tool 20 is roughly cylindrical, and the lower end of the finishing tool 20 can pass through the upper port 121, and a rounded step is formed at a position corresponding to the upper port 121. The rounded step can process the periphery of the upper port 121 of the valve port 120 into a rounded corner, and at the same time, the spiral knife marks and burrs formed on the upper port 121 during the cutting process are removed, so that the consistency and smoothness of the upper port 121 are improved, and the rounded corner line formed by the conical surface 210 of the valve stem 200 and the rounded corner of the upper port 121 has better sealing performance, thereby effectively reducing the internal leakage of the electronic expansion valve 10 and improving the system energy efficiency.

[0033] The conical surface 210 of the valve stem 200 may be a straight surface inclined inward from top to bottom, or an outwardly convex arc surface inclined inward from top to bottom, or an inwardly concave arc surface inclined inward from top to bottom.

[0034] The technical solution of the present invention uses a finishing tool 20 to finish the periphery of the upper port 121 of the valve port 120 into a rounded corner with higher smoothness, so that when the conical surface 210 of the valve stem 200 abuts against the rounded corner of the upper port 121, its consistency and sealing are better, thereby effectively reducing the internal leakage of the electronic expansion valve 10 and improving the system energy efficiency.

[0035] In one embodiment, the conical surface 210 of the valve stem 200 is a straight surface that is inclined inward from top to bottom.

[0036] Please refer to Figure 2 The conical surface 210 of the valve stem 200 is a straight surface that tilts inward from top to bottom. The conical surface 210 of the valve stem 200 can form a line seal with the fillet of the upper port 121, and the sealing line is located at the fillet. After long-term use of the electronic expansion valve 10, even if the fillet or conical surface 210 that forms the sealing line is worn, since the conical surface 210 is a straight surface that tilts inward from top to bottom, the valve stem 200 can be controlled to move downward, so that the conical surface 210 and the fillet form a new sealing line, thereby reducing the internal leakage of the electronic expansion valve 10, improving the system energy efficiency, and extending the service life of the electronic expansion valve 10.

[0037] In one embodiment, the radius of the rounded corner of the upper port 121 is R, where R≥0.05 mm.

[0038] Please refer to Figure 2 , the conical surface 210 of the valve stem 200 can form a line seal with the fillet of the upper port 121, and the sealing line is located on the fillet surface. When the radius R of the fillet is less than 0.05 mm, the fillet tends to be a right angle, which is easy to get stuck with the conical surface 210 and is more easily worn by the valve stem 200; at the same time, the surface area of ​​the fillet is too small, and after the electronic expansion valve 10 is used for a long time, when the fillet or the conical surface 210 is worn, it is difficult for the conical surface 210 and the fillet to form a new sealing line on the fillet, thereby increasing the internal leakage of the electronic expansion valve 10.

[0039] In one embodiment, the radius of the rounded corner of the upper port 121 is R, and R≤0.2 mm.

[0040] Please refer to Figure 2 Furthermore, the fillet radius of the upper port 121 is 0.05mm≤R≤0.2mm. When R>0.2mm, the fillet of the upper port 121 is too large, and the sealing line formed by the conical surface 210 and the fillet moves downward, making the original sealing line position lower. After long-term use of the electronic expansion valve 10, when the fillet or the conical surface 210 is worn, it is difficult for the conical surface 210 and the fillet to form a new sealing line on the fillet, thereby increasing the internal leakage of the electronic expansion valve 10.

[0041] The finishing tool 20 has a rounded step for fine grinding the upper port 121 , and the rounded radius of the rounded step is R0 , where R0 = R+0.1 mm, ie, 0.15 mm ≤ R0 ≤ 0.3 mm.

[0042] In one embodiment, the valve port 120 further has a communication port 122 , which is disposed at the lower end of the upper port 121 and communicates with the upper port 121 . The inner peripheral wall of the communication port 122 and the fillet of the upper port 121 are tangently transitioned at the connection.

[0043] Please refer to Figures 2 to 4 The flow port 130 has a certain length in the axial direction of the valve port assembly 100, so that the valve port assembly 100 has a large structural strength at the position of the valve port 120 and is not easily damaged by the valve stem 200 and the refrigerant. The inner peripheral wall of the communication port 122 and the fillet of the upper port 121 are tangently transitioned. On the one hand, the fillet of the upper port 121 can be directly processed by the finishing tool 20, and on the other hand, the sealing line between the conical surface 210 and the fillet of the electronic expansion valve 10 can be prevented from moving down after long-term use, thereby increasing the internal leakage of the electronic expansion valve 10.

[0044] In one embodiment, the valve port 120 further has a lower port 123 . The communication port 122 is disposed between the upper port 121 and the lower port 123 and communicates with the lower port 123 . The lower port 123 is flared in a direction from the upper port 121 to the communication port 122 .

[0045] Please refer to Figure 3 and Figure 4 After the refrigerant passes through the connecting port 122, due to the certain flow velocity of the refrigerant, it is easy to hit the inner wall surface of the valve port 120, thereby easily forming a vortex, which in turn causes the electronic expansion valve 10 to have a relatively high noise. By setting the lower port 123 in a flared shape in the direction from the upper port 121 to the connecting port 122, the connecting port 122 has a certain inclination structure, and the flow cross-sectional area change rate at the lower port 123 is reduced. When the refrigerant flows from the flow port 130 to the lower port 123, the flow cross-sectional area at the lower port 123 gradually decreases, the flow cross-sectional area change rate is small, and it is not easy to induce a vortex; at the same time, the refrigerant can flow smoothly along the flared inner wall surface of the lower port 123, ensuring the overall flow stability of the electronic expansion valve 10 and reducing the generation of noise.

[0046] In one embodiment, the periphery of the lower port 123 is rounded.

[0047] Please refer to Figure 3 and Figure 4 The lower port 123 is arranged in a flared shape in the direction from the upper port 121 to the connecting port 122, and the peripheral rounded corners of the lower port 123 can further avoid the refrigerant vortex and reduce noise.

[0048] In one embodiment, at least one of the conical surface 210 of the valve stem 200 and the inner wall surface of the upper port 121 is provided with a wear-resistant coating.

[0049] The conical surface 210 of the valve stem 200 may be provided with a smooth coating, the inner wall surface of the upper port 121 may be provided with a wear-resistant coating, or both the conical surface 210 of the valve stem 200 and the inner wall surface of the upper port 121 may be provided with a wear-resistant coating. By providing at least one of the conical surface 210 of the valve stem 200 and the inner wall surface of the upper port 121 with a wear-resistant coating, the wear resistance of the conical surface 210 and / or the fillet surface may be improved, thereby effectively preventing the conical surface 210 and the fillet from being worn, and extending the service life of the electronic expansion valve 10. At least one of the conical surface 210 of the valve stem 200 and the inner wall surface of the upper port 121 may be treated by a carburizing or nitriding process to improve the hardness and wear resistance of the conical surface 210 and / or the fillet surface.

[0050] In one embodiment, the valve assembly 100 further comprises a plurality of flow ports 130 communicating with the valve cavity 110 , and the plurality of flow ports 130 are spaced apart on the peripheral wall of the valve assembly 100 .

[0051] Please refer to Figure 3 The side wall of the valve port assembly 100 is provided with a flow port 130, the valve port 120 and the flow port 130 are connected through the valve cavity 110, and the flow port 130 and the valve port 120 are used to connect the pipe to achieve the flow in and out of the refrigerant. There are multiple flow ports 130, which can be connected to multiple pipes, so that the electronic expansion valve 10 can be applied to more complex scenarios, improving the adaptability of the electronic expansion valve 10.

[0052] The utility model also proposes a refrigeration device, which includes an electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0053] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve port assembly, the valve port assembly comprising a valve cavity and a valve port, the valve port comprising an upper port communicating with the valve cavity, and a peripheral chamfer of the upper port being arranged; A valve stem extends into the valve port assembly and is used to open and close the valve port; a conical surface is formed on the side wall of the valve stem, and when the valve port is closed, the conical surface abuts against the rounded corner of the upper port.

2. The electronic expansion valve according to claim 1, characterized in that: The conical surface of the valve stem is a straight surface inclined inward from top to bottom.

3. The electronic expansion valve according to claim 1, characterized in that: The radius of the fillet of the upper port is R, and R≥0.05mm.

4. The electronic expansion valve according to claim 3, characterized in that: R≤0.2mm.

5. The electronic expansion valve according to claim 1, characterized in that: The valve port also has a communication port, which is arranged at the lower end of the upper port and communicates with the upper port. The inner peripheral wall of the communication port and the fillet of the upper port are connected in a tangent transition manner.

6. The electronic expansion valve according to claim 5, characterized in that: The valve port further has a lower port, the communication port is arranged between the upper port and the lower port and communicates with the lower port, and the lower port is arranged in a flared shape in a direction from the upper port to the communication port.

7. The electronic expansion valve according to claim 6, characterized in that: The periphery of the lower port is rounded.

8. The electronic expansion valve according to claim 1, characterized in that: At least one of the conical surface of the valve stem and the inner wall surface of the upper port is provided with a wear-resistant coating.

9. The electronic expansion valve according to claim 1, characterized in that: The valve port assembly also has a plurality of flow ports communicating with the valve cavity, and the plurality of flow ports are arranged at intervals on the peripheral wall of the valve port assembly.

10. A refrigeration device, characterized in that: Comprising the electronic expansion valve as described in any one of claims 1-9.

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