An electronic expansion valve

Abstract

The present invention relates to an electronic expansion valve, comprising a coil and a valve body, wherein the coil is mounted on the valve body; the valve body comprises a housing, a rotor, a valve core and a valve seat, wherein the rotor is in driving connection with the valve core, and the valve seat is provided with a valve port channel corresponding to the valve core, wherein the valve port channel comprises an upper valve port portion and a lower valve port portion, wherein a noise reduction portion is provided below the lower valve port portion, wherein the noise reduction portion comprises a multi-step refrigerant flow channel, wherein the inner wall of the multi-step refrigerant flow channel comprises a multi-step gradual change step, wherein the inner diameter of each step increases step by step from the upper valve port portion to the lower valve port portion. The multi-step gradual change step of the noise reduction portion of the electronic expansion valve can play a role in continuously crushing and refining bubbles in the refrigerant, and can prevent the refrigerant from changing rapidly in flow velocity when flowing through the valve port, thereby playing a buffering effect and achieving the effect of reducing noise.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, and in particular to an electronic expansion valve used in a refrigeration system. Background Art

[0002] The existing electronic expansion valve is mainly composed of two parts: a coil and a valve body. The valve body is further composed of a rotor, a valve seat assembly, a shell, etc. The coil is fixed to the valve body through a coil fixing frame. When the coil is energized, it generates magnetic force to drive the rotor to rotate, and the rotor drives the valve needle to move axially to open and close the valve body, thereby adjusting the refrigerant flow through the valve port.

[0003] Since there are two phases, gas and liquid, in the refrigerant, bubbles will be generated when the refrigerant passes through the valve port, causing noise. Summary of the invention

[0004] The purpose of this technical solution is to provide an electronic expansion valve to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the technical solution provides an electronic expansion valve, including a coil and a valve body, wherein the coil is installed on the valve body; the valve body includes a shell, a rotor, a valve core and a valve seat, wherein the rotor is drivingly connected to the valve core, and the valve seat is provided with a valve port channel corresponding to the valve core, wherein the valve port channel has an upper valve port portion and a lower valve port portion, wherein a noise reduction portion is provided below the lower valve port portion, wherein the noise reduction portion has a multi-step refrigerant flow channel, wherein the inner wall of the multi-step refrigerant flow channel includes a multi-step gradual step, and each step of the step has a The inner diameter increases step by step from the upper valve mouth to the lower valve mouth; the noise reduction part and the valve seat are split structures, the valve seat is provided with a noise reduction mounting hole corresponding to the noise reduction part, and the noise reduction part is installed and fixed to the noise reduction mounting hole; the noise reduction mounting hole is a tapered hole, and its aperture gradually increases from the upper valve mouth to the lower valve mouth; the outer wall of the noise reduction part includes a plurality of gradual steps, and the plurality of gradual steps of the outer wall of the noise reduction part and the plurality of gradual steps of the inner wall of the noise reduction part define a generally uniform wall thickness.

[0006] In the electronic expansion valve provided by the present technical solution, the refrigerant enters the valve port channel from the upper valve port portion of the valve seat, and then flows out from the lower valve port portion, and then enters the noise reduction portion located below the lower valve port portion. Since the inner diameter of the multi-step flow channel of the noise reduction portion increases step by step along the direction of refrigerant flow (reverse flow is also possible), when the refrigerant passes through the noise reduction portion, the multi-stage gradual steps of the noise reduction portion can play a role in continuously crushing and refining bubbles in the refrigerant, and can prevent the refrigerant from changing rapidly in flow velocity when flowing through the valve port, thereby playing a buffering effect and achieving the effect of reducing noise.

[0007] Since both the outer and inner surfaces of the noise reduction part have multiple levels of gradual steps, thereby defining a generally uniform wall thickness, it can be a thin-walled drawn part. Compared with solid processed parts, it can be formed by a tapered pipe through a stamping process, which is easier to process and manufacture. It can not only significantly improve processing efficiency and reduce manufacturing costs, but also be easy to install and fix. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of an electronic expansion valve provided in the first embodiment of the present invention;

[0009] Figure 2 for Figure 1 A partial enlarged view of the matching between the valve core and the valve seat of the electronic expansion valve shown;

[0010] Figure 3 It is a partial enlarged view of the multi-step refrigerant flow channel shown in 2;

[0011] Figure 4 A schematic diagram of the structure of an electronic expansion valve provided in a second embodiment of the present invention;

[0012] Figure 5 for Figure 4 A partial enlarged view of the matching between the valve core and the valve seat of the electronic expansion valve shown;

[0013] Figure 6 A schematic diagram of the structure of an electronic expansion valve provided in a third embodiment of the present invention;

[0014] Figure 7 for Figure 6 A partial enlarged view of the valve seat of the electronic expansion valve and the vertical pipe matching;

[0015] Figure 8 It is a partial enlarged view of the multi-step refrigerant flow channel shown in 7.

[0016] In the figure:

[0017] 10-coil; 20-valve body; 21-housing; 22-rotor; 23-valve needle; 24-valve seat; 241-valve port channel; 2411-upper valve port portion; 2412-lower valve port portion; 242-noise reduction mounting hole; 25-transverse connecting pipe; 26-vertical connecting pipe; 27-noise reduction portion; 271-multi-step refrigerant flow channel; 2711-step; 272-first end portion; 273-second end portion; 274-annular silencer chamber. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0020] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of an electronic expansion valve provided in the first embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of the matching between the valve core and the valve seat of the electronic expansion valve shown; Figure 3 This is a partial enlarged view of the multi-step refrigerant flow channel shown in 2.

[0021] As shown in the figure, in the first embodiment, the electronic expansion valve provided by the present invention is mainly composed of a coil 10 and a valve body 20, the coil 10 is installed on the valve body 20, and the valve body 20 is further composed of a shell 21, a rotor 22, a valve needle 23 and a valve seat 24, etc. The rotor 22 is connected to the valve needle 23 through a screw drive, and the valve seat 24 is provided with a valve port channel 241 corresponding to the valve needle 23, and the valve port channel 241 has an upper valve port portion 2411 and a lower valve port portion 2412. The inlet end of the valve seat 24 is connected to a horizontal pipe 25, and the outlet end of the valve seat 24 is connected to a vertical pipe 26. When working, the coil 10 is energized to generate magnetic force, driving the rotor 22 to rotate, and the rotor 22 is converted into the up and down movement of the valve needle 23 through the drive of the screw, thereby realizing the opening and closing of the electronic expansion valve, and then realizing the regulation of the refrigerant flow.

[0022] A noise reduction portion 27 is provided below the lower valve port portion 2412. By adding the noise reduction portion 27, the noise generated when the refrigerant flows through the valve port can be effectively reduced.

[0023] This noise reduction portion 27 is integrally formed with the valve seat 24 and can be directly processed on the valve seat 24. The noise reduction portion 27 has a multi-step refrigerant flow channel 271. The inner wall of the multi-step refrigerant flow channel 271 is divided into four levels of continuously distributed gradual steps 2711. The inner diameter of each level of step 2711 increases step by step from the upper valve mouth portion 2411 to the lower valve mouth portion 2412, that is, d1<d2<d3<d4. Assuming that the inner diameter of the valve mouth channel 241 is A1, the relevant dimensional parameters satisfy 1.06≤d1 / A1≤5, and d4≤7mm, so as to obtain a better noise reduction effect as much as possible under the premise of ensuring the performance of the electronic expansion valve.

[0024] In this embodiment, the tip portions of the various levels of gradual steps 2711 on the inner wall of the noise reduction portion 27 are provided with chamfers (or arc transitions) to better improve the flow resistance performance, and the end of the vertical connecting pipe 26 connected to the valve seat 24 is provided with an expanded diameter portion, and the lower end of this expanded diameter portion exceeds the lower end of the noise reduction portion 27 by a certain distance, so that the vertical connecting pipe 26 and the end of the noise reduction portion 27 are jointly limited to form an expanded cavity area B, and this expanded cavity area B can achieve the function of further noise reduction.

[0025] In addition, although the depths of the four-level gradual steps 2711 of the present embodiment are substantially equal, in other embodiments, the depth of the four-level gradual steps 2711 may also be gradually increased from the upper valve mouth portion 2411 to the lower valve mouth portion 2412, so that the bubbles in the refrigerant are continuously broken and refined with relatively dense steps 2711 at the beginning, and the bubbles in the refrigerant are broken and refined with relatively sparse steps 2711 in subsequent stages, so as to further enhance the buffering and noise reduction effects.

[0026] Please refer to Figure 4 , Figure 5 , Figure 4 A schematic diagram of the structure of an electronic expansion valve provided in a second embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged view of the matching between the valve core and the valve seat of the electronic expansion valve is shown.

[0027] As shown in the figure, in the second embodiment, the electronic expansion valve provided by the present invention is also composed of a coil 10 and a valve body 20, the coil 10 is installed on the valve body 20, and the valve body 20 is further composed of a shell 21, a rotor 22, a valve needle 23 and a valve seat 24, etc. The rotor 22 is connected to the valve needle 23 through a screw drive, and the valve seat 24 is provided with a valve port channel 241 corresponding to the valve needle 23, and the valve port channel 241 has an upper valve port portion 2411 and a lower valve port portion 2412. The inlet end of the valve seat 24 is connected to a horizontal pipe 25, and the outlet end of the valve seat 24 is connected to a vertical pipe 26. When working, the coil is energized to generate magnetic force, driving the rotor 22 to rotate, and the rotor 22 is converted into the up and down movement of the valve needle 23 through the drive of the screw, thereby realizing the opening and closing of the electronic expansion valve, and then realizing the regulation of the refrigerant flow.

[0028] A noise reduction portion 27 is provided below the lower valve port portion 2412. By adding the noise reduction portion 27, the noise generated when the refrigerant flows through the valve port can be effectively reduced.

[0029] This noise reduction part 27 and the valve seat 24 are of a split structure. The valve seat 24 is provided with a noise reduction mounting hole 242 corresponding to the noise reduction part 27. The noise reduction part 27 is installed and fixed in the noise reduction mounting hole 242. The noise reduction part 27 has a multi-step refrigerant flow channel 271. The inner wall of the multi-step refrigerant flow channel 271 is divided into five levels of continuously distributed gradual steps 2711. The inner diameter of each level of step 2711 increases step by step from the upper valve mouth part 2411 to the lower valve mouth part 2412, that is, d1<d2<d3<d4<d5. Assuming that the inner diameter of the valve mouth channel 241 is A1, the relevant dimensional parameters satisfy 1.06≤d1 / A1≤5, and d5≤7mm, so as to obtain a better noise reduction effect as much as possible under the premise of ensuring the performance of the electronic expansion valve.

[0030] In this embodiment, an end of the vertical connecting pipe 26 connected to the valve seat 24 is provided with an expanded diameter portion, and the lower end of the expanded diameter portion exceeds the lower end of the noise reduction portion 27 by a certain distance, so that the vertical connecting pipe 26 and the end of the noise reduction portion 27 are jointly limited to form an expanded cavity area B, and this expanded cavity area B can achieve the function of further noise reduction.

[0031] The noise reduction mounting hole 242 in this embodiment is a straight hole. In other embodiments, the noise reduction mounting hole 242 may also be a stepped hole or a tapered hole. The outer wall of the noise reduction portion 27 can be fixed to the noise reduction mounting hole 242 by matching with the inner wall of the stepped hole or the tapered hole.

[0032] In addition, although the depths of the five-level gradual steps 2711 of the present embodiment are substantially equal, in other embodiments, the depth of the five-level gradual steps 2711 may also be gradually increased from the upper valve mouth portion 2411 to the lower valve mouth portion 2412, so that in the initial stage, the bubbles in the refrigerant are continuously crushed and refined with relatively dense steps 2711, and in the subsequent stages, the bubbles in the refrigerant are crushed and refined with relatively sparse steps 2711, so as to further enhance the buffering and noise reduction effects.

[0033] Please refer to Figures 6 to 8 , Figure 6 A schematic diagram of the structure of an electronic expansion valve provided in a third embodiment of the present invention; Figure 7 for Figure 6 A partial enlarged view of the valve seat of the electronic expansion valve and the vertical pipe matching; Figure 8 It is a partial enlarged view of the multi-step refrigerant flow channel shown in 7.

[0034] As shown in the figure, in the third embodiment, the electronic expansion valve provided by the present invention is also composed of a coil 10 and a valve body 20, the coil 10 is installed on the valve body 20, and the valve body 20 is further composed of a shell 21, a rotor 22, a valve needle 23 and a valve seat 24, etc. The rotor 22 is connected to the valve needle 23 through a screw drive, and the valve seat 24 is provided with a valve port channel 241 corresponding to the valve needle 23, and the valve port channel 241 has an upper valve port portion 2411 and a lower valve port portion 2412. The inlet end of the valve seat 24 is connected to a horizontal pipe 25, and the outlet end of the valve seat 24 is connected to a vertical pipe 26. When working, the coil 10 is energized to generate magnetic force, driving the rotor 22 to rotate, and the rotor 22 is converted into the up and down movement of the valve needle 23 through the drive of the screw, thereby realizing the opening and closing of the electronic expansion valve, and then realizing the regulation of the refrigerant flow.

[0035] A noise reduction portion 27 is provided below the lower valve port portion 2412. By adding the noise reduction portion 27, the noise generated when the refrigerant flows through the valve port can be effectively reduced.

[0036] This noise reduction part 27 and the valve seat 24 are of a split structure. The valve seat 24 is provided with a noise reduction mounting hole 242 corresponding to the noise reduction part 27. The noise reduction part 27 is installed and fixed in the noise reduction mounting hole 242. The noise reduction part 27 has a multi-step refrigerant flow channel 271. The inner wall of the multi-step refrigerant flow channel 271 is divided into six levels of continuously distributed gradual steps 2711. The inner diameter of each level of step 2711 increases step by step from the upper valve mouth part 2411 to the lower valve mouth part 2412, that is, d1<d2<d3<d4<d5<d6. Assuming that the inner diameter of the valve mouth channel 241 is A1, the relevant dimensional parameters satisfy 1.06≤d1 / A1≤5, and d6≤7mm, so as to obtain a better noise reduction effect as much as possible under the premise of ensuring the performance of the electronic expansion valve.

[0037] Specifically, the noise reduction part 27 is a thin-walled stretched part, and the noise reduction mounting hole 242 is a tapered hole, whose aperture gradually increases from the upper valve mouth part 2411 to the lower valve mouth part 2412. Since the noise reduction part 27 is a thin-walled stretched part with a generally uniform wall thickness, the outer wall of the noise reduction part 27 also has six levels of gradual steps.

[0038] The noise reduction portion 27 has a first end portion 272 and a second end portion 273. During installation, the first end portion 272 can be first tightly fixed to the lower end step of the valve seat 24, and the second end portion 273 can be fixed to the lower portion of the valve seat 24 by welding or bonding, and then the vertical pipe 26 can be installed. Alternatively, the first end portion 272 and the second end portion 273 can be respectively welded to the valve seat 24 and then the vertical pipe 26 can be installed.

[0039] The tips of the various steps of the outer wall of the noise reduction portion 27 abut against the inner wall of the noise reduction mounting hole 242, thereby forming an annular silencer cavity 274 with the inner wall of the noise reduction mounting hole 242. The cross section of the annular silencer cavity 274 is triangular. By designing the annular silencer cavity 274, noise can be further absorbed and the noise reduction performance can be improved.

[0040] It is understandable that as the shapes of the noise reduction portion 27 and the noise reduction mounting hole 242 change, the cross-sectional shape of the annular silencer cavity 274 will also change accordingly.

[0041] In this embodiment, an end of the vertical connecting pipe 26 connected to the valve seat 24 is provided with an expanded diameter portion, and the lower end of the expanded diameter portion exceeds the lower end of the noise reduction portion 27 by a certain distance, so that the vertical connecting pipe 26 and the end of the noise reduction portion 27 are jointly limited to form an expanded cavity area B, and this expanded cavity area B can achieve the function of further noise reduction.

[0042] In addition, although the depths of the six-level gradual steps 2711 in this embodiment are substantially equal, in other embodiments, the depth of the six-level gradual steps 2711 may also be gradually increased from the upper valve mouth portion 2411 to the lower valve mouth portion 2412, so that in the initial stage, the bubbles in the refrigerant are continuously crushed and refined with relatively dense steps 2711, and in the subsequent stages, the bubbles in the refrigerant are crushed and refined with relatively sparse steps 2711, so as to further enhance the buffering and noise reduction effects.

[0043] The above embodiments are only preferred solutions of the present invention and are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, the number of the gradual steps 2711 can be adjusted according to actual needs, etc. Since there are many possible implementation methods, they will not be described one by one here.

[0044] The noise reduction principle of the electronic expansion valve in the above embodiment is as follows:

[0045] The refrigerant enters the valve seat 24 from the lateral connecting pipe 25 of the electronic expansion valve, and after flowing through the valve cavity of the valve seat 24, the flow rate is adjusted by the axial lifting movement of the valve needle 23. The refrigerant enters the valve port channel 241 from the upper valve port portion 2411 of the valve seat 24, and then flows out from the lower valve port portion 2412, and then enters the noise reduction portion 27 located below the lower valve port portion 2412. When the refrigerant passes through the noise reduction portion 27, since the first step to the last step of the noise reduction portion 27 is an expansion cavity design, and the inner diameter of the multi-step refrigerant flow channel 271 of the noise reduction portion 27 gradually increases along the direction of the refrigerant flow, the multi-step gradual step 2711 of the noise reduction portion 27 can continuously break up and refine the bubbles in the refrigerant, and the gradual change of the inner diameter d1, d2, d3...dn of the step 2711 can prevent the flow velocity of the refrigerant from changing sharply when flowing through the valve port, thereby playing a buffering effect, and further playing a role in relatively improving the noise.

[0046] The electronic expansion valve provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electronic expansion valve, comprising a coil (10) and a valve body (20), wherein the coil (10) is mounted on the valve body (20); the valve body (20) comprises a housing (21), a rotor (22), a valve core and a valve seat (24), wherein the rotor (22) is drivingly connected to the valve core, and the valve seat (24) is provided with a valve port channel (241) corresponding to the valve core, wherein the valve port channel (241) has an upper valve port portion (2411) and a lower valve port portion (2412), wherein: A noise reduction portion (27) is provided below the lower valve opening portion (2412), the noise reduction portion (27) having a multi-step refrigerant flow channel (271), the inner wall of the multi-step refrigerant flow channel (271) comprising a plurality of gradually changing steps (2711), the inner diameter of each step (2711) increasing step by step from the upper valve opening portion (2411) to the lower valve opening portion (2412); the noise reduction portion (27) and the valve seat (24) are of a split structure, the valve seat (24) is provided with a noise reduction mounting hole (242) corresponding to the noise reduction portion (27), the noise reduction portion (27) being mounted and fixed to the noise reduction mounting hole (242); the noise reduction mounting hole (242) is a conical hole , the aperture of which gradually increases from the upper valve mouth (2411) to the lower valve mouth (2412); the outer wall of the noise reduction portion (27) includes a plurality of gradually changing steps (2711), and the plurality of gradually changing steps (2711) of the outer wall of the noise reduction portion (27) and the plurality of gradually changing steps (2711) of the inner wall of the noise reduction portion (27) define a substantially uniform wall thickness; the tip of each gradually changing step (2711) of the outer wall of the noise reduction portion (27) abuts against the inner wall of the noise reduction mounting hole (242); and an annular silencer cavity (274) is formed between each gradually changing step (2711) of the outer wall of the noise reduction portion (27) and the inner wall of the noise reduction mounting hole (242).

2. The electronic expansion valve according to claim 1, characterized in that: At least part of the annular silencer cavity (274) has a triangular cross-section.

3. The electronic expansion valve according to claim 2, characterized in that: The noise reduction portion (27) is a thin-walled stretched part.

4. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The tips of the various levels of gradually changing steps (2711) on the inner wall of the noise reduction portion (27) are provided with chamfers or arc transitions.

5. The electronic expansion valve according to any one of claims 1 to 3, characterized in that: The inner wall of the multi-step refrigerant flow channel (271) includes N steps of gradual changes (2711), where N≥3.

6. The electronic expansion valve according to claim 5, characterized in that: Assuming that the inner diameter of the first-stage step (2711) is d1, the inner diameter of the last-stage step (2711) is dn, and the inner diameter of the valve port channel (241) is A1, then 1.06≤d1 / A1≤5, and dn≤7mm.

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