Electronic expansion valve

Abstract

Provided in the present application is an electronic expansion valve. The electronic expansion valve comprises: a valve body, which is provided with a communication cavity, a valve port and an extended flow channel in communication with each other in sequence, wherein the diameter of the valve port is d, the length of the extended flow channel is L1, satisfying 1.5d≤L1≤10d; a first flow passage and a second flow passage, wherein the first flow passage is in communication with the communication cavity, the valve port is located between the first flow passage and the second flow passage, and the second flow passage is in communication with the valve port by means of the extended flow channel; a valve needle, which is movably arranged in the communication cavity, wherein the valve needle can move relative to the valve port so as to adjust the flow at the valve port; and a silencing assembly, which is arranged in the first flow passage and / or the second flow passage, wherein the silencing assembly comprises at least one porous member. By means of applying the technical solution of the present application, the problem in the prior art of there being a tendency for noise to be generated in an operating process of an electronic expansion valve can be solved.

Description

Electronic expansion valve

[0001] This application claims priority to the patent application filed on January 14, 2025, with China National Intellectual Property Administration, application number 202520086642.1, entitled "Electronic Expansion Valve". Technical Field

[0002] This application relates to the field of control valve technology, and more specifically, to an electronic expansion valve. Background Technology

[0003] Currently, electronic expansion valves typically include a noise reduction component in the flow channel. This component, made of porous material, is used to refine air bubbles in the fluid and reduce noise generated during fluid flow.

[0004] In related technologies, when the opening of the electronic expansion valve decreases from a large opening to a small opening, the flow rate of the valve body decreases, the subcooling of the refrigerant before it flows through the valve port increases, and the refrigerant transforms into a pure liquid with a large subcooling. The smaller the opening, the greater the subcooling of the refrigerant before it flows through the valve port, resulting in a higher flow velocity and greater kinetic energy of the refrigerant after it passes through the valve port. If the refrigerant after it passes through the valve port is in a gas-liquid two-phase state, the proportion of liquid phase in the refrigerant increases; if it is in a liquid state, the subcooling is greater. High-speed refrigerant in a gas-liquid two-phase state with a high proportion of liquid phase or in a pure liquid state with a large subcooling can easily cause cavitation by scouring the silencer block, producing bubbles and generating noise, which affects the user experience. Summary of the Invention

[0005] This application provides an electronic expansion valve to solve the problem of noise generation during the operation of existing electronic expansion valves.

[0006] This application provides an electronic expansion valve, comprising: a valve body having a communicating cavity, a valve port, and an extended flow channel sequentially connected, wherein the diameter of the valve port is d, and the length of the extended flow channel is L1, 1.5d≤L1≤10d; a first flow channel and a second flow channel, wherein the first flow channel is connected to the communicating cavity, the valve port is located between the first flow channel and the second flow channel, and the second flow channel is connected to the valve port through the extended flow channel; a valve needle movably disposed within the communicating cavity, the valve needle being movable relative to the valve port to adjust the flow rate at the valve port; and a silencing assembly disposed within the first flow channel and / or the second flow channel, the silencing assembly comprising at least one porous element.

[0007] Furthermore, the flow channel is extended to a straight hole structure.

[0008] Furthermore, the extended flow channel has multiple flow sections that are connected sequentially. Along the direction away from the valve port from the connecting cavity, the inner diameter of the multiple flow sections gradually increases.

[0009] Furthermore, there is a transition section between two adjacent flow sections, and the two adjacent flow sections are connected through the transition section.

[0010] Furthermore, the transition section is a straight section, and the inner wall of the straight section has an angle with the axis of the extended flow channel, with the angle between 0° and 45°.

[0011] Furthermore, the transition segment is a circular arc segment, and the circular arc segment forms the transition segment.

[0012] Furthermore, the flow area of ​​the valve port is S, the flow area of ​​the flow section near the valve port is S1, 1.01S≤S1≤1.7S, and the flow area of ​​the remaining flow section along the direction from the valve port towards the silencer assembly is S. n 1.01S n-1 ≤S n ≤1.7S n-1 , n≥2.

[0013] Furthermore, the extended flow channel has a first end and a second end disposed opposite to each other along the extension direction, the second end being disposed away from the valve port, and the flow area of ​​the second end being 1 to 2 times the flow area of ​​the first end.

[0014] Furthermore, the noise reduction assembly includes a first noise reduction block and a second noise reduction block spaced apart along the axial direction. The first noise reduction block has at least one first flow hole, and the second noise reduction block has at least one second flow hole. The projections of the first flow hole and the second flow hole in the axial direction do not coincide, or partially coincide.

[0015] Furthermore, the first flow hole is coaxially arranged with the first noise reduction block.

[0016] Furthermore, when multiple second flow holes are provided, the multiple second flow holes are arranged in a ring at intervals around the axis of the second silencer block.

[0017] Furthermore, the total flow area of ​​the first flow hole is T1, where S≤T1≤5S.

[0018] Furthermore, the total flow area of ​​the second flow hole is T2, where S≤T2≤5S.

[0019] Furthermore, the diameter of the first silencing block is D1, the diameter of the second silencing block is D2, 2d≤D1≤10d, and / or 2d≤D2≤10d.

[0020] Furthermore, the distance from the end of the extended flow channel away from the valve port to the end face of the silencer assembly facing the extended flow channel is L2, where 0.5d≤L2≤10d.

[0021] Furthermore, the valve body includes a main body and an extension section, the extension section having an extended flow channel, and the extension section and the main body being fixedly connected to each other.

[0022] Furthermore, the valve body includes a main body and an extension section, the extension section having an extended flow channel, and the extension section and the main body are integrally formed together.

[0023] By applying the technical solution of this application, the extended flow channel has the function of throttling and reducing the pressure of the refrigerant and reducing the refrigerant flow rate. According to the installation method of the electronic expansion valve, when the refrigerant flows from the first flow channel to the second flow channel as the first working condition, a silencer component can be installed in the second flow channel. The refrigerant can be regulated by the valve port and then flow to the silencer component after being slowed down by the extended flow channel. In this way, after the refrigerant flows through the valve port and is regulated by the valve needle, it will flow to the silencer component through the extended flow channel. When the refrigerant flows from the second flow channel to the first flow channel (under the first operating condition), a silencing component can be installed in the first flow channel. In this way, the refrigerant first flows through the extended flow channel, then through the valve port, and finally flows to the silencing component. The length of the extended flow channel is between 1.5 and 10 times the diameter of the valve port, thus forming a longer flow path. Compared with the traditional technical solution where the high-speed refrigerant flows directly to the silencing block after throttling, the refrigerant flow velocity to the silencing component is lower, the kinetic energy is lower, and the flow velocity of the refrigerant scouring the silencing module is reduced, thereby reducing turbulent kinetic energy and reducing airflow noise. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 shows a schematic diagram of the structure of the electronic expansion valve provided in the first embodiment of this application;

[0026] Figure 2 shows a schematic diagram of the structure of the electronic expansion valve provided in the second embodiment of this application;

[0027] Figure 3 shows a schematic diagram of the structure of the electronic expansion valve provided in the third embodiment of this application;

[0028] Figure 4 shows a magnified view of a portion of point A in Figure 1.

[0029] The above-mentioned figures include the following reference numerals: 100, valve body; 01, first flow channel; 02, second flow channel; 101, main body; 102, extension section; 110, connecting cavity; 120, valve port; 130, extended flow channel; 131, flow section; 132, straight section; 140, mounting cavity; 200, valve needle; 300, silencing assembly; 310, first silencing block; 311, first flow hole; 320, second silencing block; 321, second flow hole; 330, retaining ring. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] As shown in Figures 1 to 3, this application embodiment provides an electronic expansion valve, which includes a valve body 100, a first flow channel 01, a second flow channel 02, a valve needle 200, and a silencer assembly 300. The valve body 100 has a sequentially connected connecting cavity 110, a valve port 120, and an extended flow channel 130. The valve port 120 and the extended flow channel 130 are connected. The diameter of the valve port 120 is d, and the length of the extended flow channel 130 is L1, where 1.5d ≤ L1 ≤ 10d. The first flow channel 01 is connected to the connecting cavity 110 and located on the side of the valve port 120 opposite to the extended flow channel 130. The second flow channel 02 is connected to the extended flow channel 130 and located on the side of the extended flow channel 130 opposite to the connecting cavity 110. The electronic expansion valve is a two-way valve. Refrigerant can flow in from the first flow channel 01, pass through the valve port 120, and flow out from the second flow channel 02; alternatively, it can flow in from the second flow channel 02, pass through the valve port 120, and flow out from the first flow channel 01. The valve needle 200 is movably disposed within the communicating cavity 110 and can move relative to the valve port 120 to regulate the flow rate at the valve port 120. A silencing assembly 300 is disposed within the first flow channel 01 and / or the second flow channel 02, and the silencing assembly 300 includes at least one porous element.

[0032] Depending on the connection direction of the electronic expansion valve and the usage requirements of the system, the electronic expansion valve has a first operating condition and a second operating condition. In the first operating condition, the refrigerant flows from the first flow channel 01 through the valve port 120 to the extended flow channel 130, and then flows through the second flow channel 02. In the second operating condition, the refrigerant flows from the second flow channel 02 through the extended flow channel 130 to the valve port 120, and then flows through the first flow channel 01. The silencing component 300 is disposed in the second flow channel 02.

[0033] In the first operating condition, the system is in heating mode. At this time, the first flow channel 01 is before the valve. In the traditional technical solution, the refrigerant has a large degree of subcooling before flowing through the valve port 120 at a small opening. After flowing through the valve port 120, it becomes a gas-liquid two-phase state with a high liquid phase ratio or a pure liquid state with a large degree of subcooling. If only the silencing component 300 is set, the refrigerant fluid will easily generate cavitation after scouring the silencing component 300, thus generating noise. If only the extended flow channel 130 is set, the large bubbles in the refrigerant flow may generate noise when they burst. This application, by simultaneously setting up an extended flow channel 130 and a silencing component 300, allows for the following in the first operating condition: when the electronic expansion valve is at a small opening, the refrigerant has a relatively large subcooling before flowing through the valve port 120. Before flowing through the silencing component 300, the refrigerant passes through the valve port 120 and the extended flow channel 130. The extended flow channel 130 can reduce the refrigerant flow rate. The highly subcooled pure liquid refrigerant flows in from the first flow channel 01, and after passing through the valve port 120 and the extended flow channel 130, it transforms into a gas-liquid two-phase refrigerant with a lower flow rate and a higher proportion of gas phase, thus reducing the cavitation effect generated when the refrigerant scours the silencing component 300; or, after the refrigerant passes through the valve port 120 and the extended flow channel 130, it transforms into a slightly subcooled pure liquid. After scouring the silencing component 300, even if cavitation occurs, the low subcooling of the refrigerant reduces the intensity of its phase change, thus still reducing noise compared to traditional structures.

[0034] In the second operating condition, the refrigerant is reversed and the system is in cooling mode. At this time, the second flow channel 02 is located before the valve. There may be problems such as insufficient refrigerant, short system start-up time, lack of an economizer in the system, or insufficient heat exchanger area of ​​the outdoor unit, resulting in insufficient subcooling before the valve. At this time, the subcooling before the valve is small, the proportion of gas phase in the refrigerant fluid is too high, and discontinuous bubbles are easily generated in the refrigerant, thus generating noise. A silencer component 300 is installed at the second flow channel 02. That is, the silencer component 300 installed before the valve can sort out and refine the bubbles in the refrigerant fluid and reduce the operating noise of the electronic expansion valve.

[0035] Depending on the connection direction of the electronic expansion valve and the system's usage requirements, the electronic expansion valve may be connected to the system in reverse. In this case, the flow directions of the first and second operating conditions are opposite. In the first operating condition, the refrigerant flows from the second flow channel 02 through the extended flow channel 130 to the valve port 120, and then flows through the first flow channel 01. In the second operating condition, the refrigerant flows from the first flow channel 01 through the valve port 120 to the extended flow channel 130, and then flows through the second flow channel 02. The silencing component 300 can be installed in the first flow channel 01. Thus, in the case of the electronic expansion valve being connected to the system in reverse, similar to the case of being connected in the forward direction, the extended flow channel 130 and the silencing component 300 can reduce the operating noise of the electronic expansion valve.

[0036] In summary, by simultaneously incorporating the extended flow channel 130 and the silencing component 300, this application can simultaneously address the noise issue arising from the refrigerant flowing in both directions under two operating conditions. Specifically, the silencing component 300 addresses the insufficient subcooling of the refrigerant before it passes through the valve port 120 under the second operating condition, while the extended flow channel 130 addresses the significant subcooling of the refrigerant before it passes through the valve port 120 when the electronic expansion valve is at a small opening under the first operating condition. This improves the applicability of the electronic expansion valve and enhances the user experience.

[0037] In this application, a noise reduction component 300 may be provided separately in the first circulation channel 01 or the second circulation channel 02, or a noise reduction component 300 may be provided in both the first circulation channel 01 and the second circulation channel 02, depending on actual needs, so as to improve the noise reduction effect.

[0038] By applying the technical solution of this application, the extended flow channel 130 has the function of throttling and reducing the pressure and flow rate of the refrigerant. According to the installation method of the electronic expansion valve, when the refrigerant flows from the first flow channel 01 to the second flow channel 02 as the first working condition, a silencer component 300 can be installed in the second flow channel 02. The refrigerant can be regulated by the valve port 120 and then flow to the silencer component 300 after being slowed down by the extended flow channel 130. In this way, after the refrigerant flows through the valve port 120 and is regulated by the valve needle 200, it will flow to the silencer component 300 through the extended flow channel 130. When the refrigerant flows from the second flow channel 02 to the first flow channel 01 in the first operating condition, a silencing component 300 can be installed in the first flow channel 01. In this way, the refrigerant first flows through the extended flow channel 130, then through the valve port 120, and finally flows to the silencing component 300. The length of the extended flow channel 130 is between 1.5 and 10 times the diameter of the valve port 120, thus forming a longer flow path. Compared with the traditional technical solution where the high-speed refrigerant flows directly to the silencing block after throttling, the refrigerant flow velocity to the silencing component 300 is lower, the kinetic energy is lower, the flow velocity of the refrigerant scouring the silencing module is reduced, thereby reducing turbulent kinetic energy and reducing airflow noise.

[0039] Specifically, the valve body 100 provided in this application is provided with a connecting pipe on its side wall and one end along the axial direction of the electronic expansion valve. The connecting pipe is fixedly connected to the valve body 100, and one of the connecting pipes forms a first flow channel 01 and the other connecting pipe forms a second flow channel 02.

[0040] This application takes the flow from the first flow channel 01 to the second flow channel 02 as the first working condition, with the silencing component 300 disposed in the second flow channel 02, the connecting pipe disposed on the side wall of the valve body 100 forming the first flow channel 01, and the connecting pipe disposed at one end of the valve body 100 along the axial direction of the electronic expansion valve forming the second flow channel as an example.

[0041] Specifically, when the length L1 of the extended flow channel 130 is less than 1.5 times the diameter d of the valve port 120, the length of the extended flow channel 130 is too short. The effect of the extended flow channel 130 in throttling and reducing pressure and lowering the refrigerant flow rate is minimal, the kinetic energy of the refrigerant remains high, and the high-speed refrigerant flowing over the silencing component 300 will generate noise. Furthermore, it cannot effectively reduce the subcooling of the liquid refrigerant, resulting in a large proportion of liquid refrigerant and a tendency for cavitation. When the length L1 of the extended flow channel 130 is greater than 10 times the diameter d of the valve port 120, the length of the extended flow channel 130 is too long, making processing difficult. In this application, by setting 1.5d ≤ L1 ≤ 10d, it is possible to ensure that the extended flow channel 130 and the silencing component 300 work together to produce a good noise reduction effect and are easy to process. Specifically, L1 can be set to 1.5d, 2d, 5d, or 9d, preferably between 2d and 9d.

[0042] Referring to FIG1, in the first embodiment of this application, the extended flow channel 130 has a straight hole structure. With this configuration, the extended flow channel 130 can throttle and reduce pressure, reduce the refrigerant flow rate, and facilitate the processing and forming of the extended flow channel 130, thereby reducing manufacturing costs.

[0043] Referring to Figure 2, in the second embodiment of this application, the extended flow channel 130 has multiple flow sections 131 that are sequentially connected. Along the direction of the valve port 120 away from the connecting cavity 110, the inner diameter of the multiple flow sections 131 gradually increases. Through this arrangement, the flow area of ​​the extended flow channel 130 gradually increases. By progressively reducing the refrigerant velocity through the extended flow channel 130, the refrigerant velocity scouring the silencing component 300 is reduced, thereby reducing turbulent kinetic energy and airflow noise.

[0044] Referring to Figure 3, in the third embodiment of this application, the extended flow channel 130 has multiple flow sections 131, which are sequentially connected. Along the direction of the valve port 120 away from the connecting cavity 110, the inner diameter of the multiple flow sections 131 gradually increases. A transition section is provided between adjacent flow sections 131, and adjacent flow sections 131 are connected through the transition section. Through this arrangement, the gradually increasing inner diameter of the multiple flow sections 131 can reduce the refrigerant flow velocity in stages, reduce the refrigerant flow velocity scouring the silencing component 300, thereby reducing turbulent kinetic energy and airflow noise. The transition section can mitigate the transition between adjacent flow sections 131, reduce abrupt changes in the flow area of ​​the extended flow channel 130, prevent rapid changes in refrigerant pressure drop, and reduce vortices that may be generated when the refrigerant passes through uneven areas, thus reducing the noise of the refrigerant flowing within the extended flow channel 130.

[0045] As shown in Figures 3 and 4, in the third embodiment of this application, the transition section can be a straight section 132. The inner wall of the straight section 132 forms an angle with the axis of the extended flow channel 130, and the angle is between 0° and 45°. With this configuration, the straight section 132 can mitigate the abrupt change in the flow area of ​​the flow section 131, and it can be formed by chamfering at the stepped structure formed between two adjacent flow sections 131, which is convenient for processing.

[0046] In the third embodiment of this application, the transition section can also be an arc segment. The arc segment forms the transition section, and the center of the arc segment is located on the side of the inner wall of the extended flow channel 130 away from or close to the axis of the extended flow channel 130, so as to avoid the direct turning of the angle and prevent the noise caused by the bubble burst due to the angle turning, thereby improving the noise reduction effect of the electronic expansion valve.

[0047] Furthermore, in the second and third embodiments of this application, the flow area of ​​the valve port 120 is S, the flow area of ​​the flow section 131 near one end of the valve port 120 is S1, S1 = S + 1%S ~ 70%S, that is, 1.01S ≤ S1 ≤ 1.7S, and the flow area of ​​the remaining flow section 131 along the direction from the valve port 120 to the silencing component 300 is S. n S n =S n-1 +1%S n-1 ~70% S n-1 , n≥2, i.e. 1.01S n-1 ≤S n ≤1.7S n-1 With the above settings, the flow area of ​​multiple flow sections 131 gradually increases from 1%S to 70%S with the flow area of ​​valve port 120 as the reference. This ensures that the reduction of refrigerant flow rate has a certain gradient, without a large reduction, thus ensuring fluid flow efficiency.

[0048] It is worth noting that the circulation area of ​​multiple circulation sections 131 can be gradually increased at the same ratio or at different ratios.

[0049] Specifically, the valve port 120 in this application can be directly formed from the port of the extended flow channel 130. In this way, the flow area of ​​the valve port 120 is equal to the flow area of ​​the corresponding flow section 131, and the inner diameter of the remaining flow sections 131 can be increased in increments of 1%S to 70%S.

[0050] Specifically, the inner diameter of the multiple flow sections 131 can be varied at a gradually increasing rate, and the angle between the inner wall of the multiple straight sections 132 and the axis of the extended flow channel 130 gradually increases.

[0051] In this application, the extended flow channel 130 has a first end and a second end disposed opposite to each other along the extension direction. The second end is located away from the valve port, and the flow area of ​​the second end is 1 to 2 times the flow area of ​​the first end. When the flow area of ​​the second end is smaller than the flow area of ​​the first end, the extended flow channel 130 will generate a large flow resistance to the fluid; when the flow area of ​​the second end is greater than twice the flow area of ​​the first end, the flow area of ​​the second end is too large, and its effect on reducing the proportion of liquid refrigerant is small. In this application, by setting the flow area of ​​the second end to be 1 to 2 times the flow area of ​​the first end, the flow efficiency of the refrigerant fluid can be guaranteed, and the proportion of gaseous refrigerant after the refrigerant flows through the extended flow channel 130 can be guaranteed. Specifically, the flow area of ​​the second end can be 1, 1.5, or 2 times the flow area of ​​the first end, etc.

[0052] In this application, the noise reduction assembly 300 includes at least one porous element to refine air bubbles in the refrigerant, thereby reducing noise.

[0053] As shown in Figure 4, the noise reduction assembly 300 includes a first noise reduction block 310 and a second noise reduction block 320 spaced apart along the axial direction. The first noise reduction block 310 has at least one first flow hole 311, and the second noise reduction block 320 has at least one second flow hole 321. The projections of the first flow hole 311 and the second flow hole 321 in the axial direction do not coincide, or partially coincide. Specifically, the second flow hole 321 can be arranged annularly around the axis of the second noise reduction block 320, and the first noise reduction block 310 and the second noise reduction block 320 have a porous structure.

[0054] Furthermore, the first flow hole 311 is coaxially arranged with the first silencing block 310. With this arrangement, the first flow hole 311 can be located at the center of the first flow channel 01 and the second flow channel 02, ensuring the flow performance of fluid when passing through the silencing component.

[0055] Furthermore, when multiple second flow holes 321 are provided, the multiple second flow holes 321 are arranged in a ring at intervals around the axis of the second noise-reducing block 320. In this arrangement, the multiple second flow holes 321 can be evenly distributed to ensure the flow capacity of impurities when flowing through the second noise-reducing block 320.

[0056] Specifically, the first silencing block 310 and the second silencing block 320 can be filter screen sintered blocks. The filter screen sintered blocks are woven from metal wires or alloy wires, and then the metal wires or alloy wires are sintered together by high temperature to form a uniform block filter material with high strength and stability, which can effectively achieve the filtering effect.

[0057] Specifically, the first silencing block 310 and the second silencing block 320 can be sintered stainless steel filter blocks. Stainless steel is low in cost, and the sintering process ensures reliability after molding and good compatibility with fluids.

[0058] The first flow hole 311 on the first silencing block 310 and the second flow hole 321 on the second silencing block 320 form a flow area, with the remaining portion being a decomposition area. Through this arrangement, larger bubbles in the two-phase fluid flowing through the first silencing block 310 and the second silencing block 320 are decomposed into smaller bubbles in the decomposition area. This makes the bubble size in the fluid more uniform, thereby reducing the abnormal noise generated by unstable, discontinuous large bubbles during flow. When the refrigerant changes its flow direction, impurities attached to the decomposition area can flow through the flow area past the silencing assembly, preventing blockage. Furthermore, in this application, by ensuring that the axial projections of the first flow hole 311 and the second flow hole 321 do not coincide or only partially coincide, bubbles in the fluid mixed with impurities can still flow through the decomposition area on the first silencing block 310 or the second silencing block 320 after passing through the first flow hole 311 or the second flow hole 321, thus improving the decomposition effect of the silencing assembly 300 and enhancing its noise reduction capability.

[0059] Specifically, the total flow area of ​​the first flow hole 311 is T1, where S≤T1≤5S. When the flow area of ​​the first flow hole 311 is less than S, the flow area is small, and impurities in the fluid are still easily attached to the first silencer block 310. Furthermore, a small flow area also leads to significant flow resistance when the fluid flows through the first silencer block 310, affecting the flow capacity of the electronic expansion valve. When the flow area of ​​the first flow hole 311 is greater than 5S, the flow area is large, the decomposition area of ​​the first silencer block 310 is small, and the effect of refining bubbles in the refrigerant flow is poor, reducing the noise reduction effect of the first silencer block 310. In this application, by setting S≤T1≤5S, the noise reduction effect of the first silencer block 310 can be guaranteed, while also ensuring the refrigerant flow efficiency. Specifically, T1 can be set to S, 3S, or 5S.

[0060] Specifically, the total flow area of ​​the second flow hole 321 is T2, where S≤T2≤5S. When the flow area of ​​the second flow hole 321 is less than S, the flow area is small, and impurities in the fluid are still easily attached to the second silencer block 320. Furthermore, a small flow area also leads to significant flow resistance when the fluid flows through the second silencer block 320, affecting the flow capacity of the electronic expansion valve. When the flow area of ​​the second flow hole 321 is greater than 5S, the flow area is large, the decomposition area of ​​the second silencer block 320 is small, and the effect of refining bubbles in the refrigerant flow is poor, reducing the noise reduction effect of the second silencer block 320. In this application, by setting S≤T2≤5S, the noise reduction effect of the second silencer block 320 can be guaranteed, while also ensuring the refrigerant flow efficiency. Specifically, T2 can be set to S, 3S, or 5S.

[0061] Furthermore, the diameter of the first silencing block 310 is D1, and the diameter of the second silencing block 320 is D2. In this application, 2d ≤ D1 ≤ 10d, or 2d ≤ D2 ≤ 10d, or both D1 and D2 can be greater than or equal to 2d and less than or equal to 10d simultaneously. Specifically, when the diameter D1 of the first silencing block 310 or the diameter D2 of the second silencing block 320 is less than 2d, the area of ​​the first silencing block 310 or the second silencing block 320 is small, and the efficiency of the silencing assembly 300 in decomposing bubbles is low. When the diameter D1 of the first silencing block 310 or the diameter D2 of the second silencing block 320 is greater than 10d, the area of ​​the first silencing block 310 or the second silencing block 320 is too large, and the refrigerant fluid will experience a large pressure drop when flowing towards the silencing assembly 300, reducing the fluid velocity. In this application, by setting 2d≤D1≤10d and 2d≤D2≤10d, the noise reduction effect of the silencing component 300 and the fluid flow efficiency can be effectively guaranteed. Specifically, D1 and D2 can be set to 2d, 4d, 6d, 8d, or 10d, respectively. It is worth noting that D1 and D2 in this application can be equal or unequal.

[0062] In this application, the first silencing block 310 and the second silencing block 320 are spaced apart to ensure the flow performance of the refrigerant fluid. Specifically, a retaining ring 330 can be provided between the first silencing block 310 and the second silencing block 320 to restrict the opposite movement of the first silencing block 310 and the second silencing block 320 and ensure the spacing between the first silencing block 310 and the second silencing block 320.

[0063] Specifically, the first silencing block 310 can be disposed on the side of the silencing assembly 300 near the valve port 120, and the second silencing block 320 can also be disposed on the side of the silencing assembly 300 near the valve port 120. This application does not impose any restrictions on these provisions.

[0064] In some embodiments of this application, the valve body 100 may have a mounting cavity 140, which is located at one end of the extended flow channel 130 away from the connecting cavity 110. The mounting cavity 140 is used to mount the silencing component 300. There is a gap between the silencing component 300 and the extended flow channel 130. The refrigerant fluid flowing out through the extended flow channel 130 still has a certain speed. The gap between the silencing component 300 and the extended flow channel 130 can further buffer and slow down the refrigerant flowing out of the extended flow channel 130, further reducing the kinetic energy of the refrigerant when it impacts the silencing component 300, and improving the noise reduction effect.

[0065] Furthermore, the distance from the end of the extended flow channel 130 away from the valve port 120 to the end face of the silencing component 300 facing the extended flow channel 130 is L2, where 0.5d ≤ L2 ≤ 10d. When L2 is less than 0.5d, the distance from the silencing component 300 to the extended flow channel 130 is too small, resulting in a small buffering effect on the refrigerant flowing out of the extended flow channel 130. The refrigerant will still impact the silencing component 300 at a certain speed, leading to poor noise reduction. When L2 is greater than 10d, the distance from the silencing component 300 to the extended flow channel 130 is too large, making processing more difficult. The refrigerant fluid will flow through a longer flow path before passing through the silencing component 300, during which bubble bursts will generate noise. In this application, by setting 0.5d ≤ L2 ≤ 10d, the electronic expansion valve can be guaranteed to have a better noise reduction effect. Specifically, L2 can be selected as 0.5d, 2d, 6d, 8d, or 10d.

[0066] In some feasible embodiments of this application, the valve body 100 includes a body 101 and an extension section 102, the extension section 102 having an extended flow channel 130, and the extension section 102 and the body 101 being fixedly connected to each other. This arrangement facilitates the machining of the extended flow channel 130 and improves the machining accuracy of the extended flow channel 130.

[0067] In some feasible embodiments of this application, the valve body 100 includes a body 101 and an extension 102, the extension 102 having an extended flow channel 130, and the extension 102 and the body 101 being integrally formed together. This arrangement can reduce the assembly steps between the extension 102 and the body 101, simplifying the production process.

[0068] To illustrate the noise reduction effect of the technical solution in this application, a comparative and improved example is provided: The comparative example applies the traditional technical solution, where the flow area of ​​valve port 120 is 3.14 mm². 2Furthermore, the extended flow channel 130 is not provided; in the improved example, applying the technical solution of this application, an extended flow channel 130 is provided at the valve port 120, and there is a gap between the silencing component 300 and the extended flow channel 130. The refrigerant flow direction is from the first flow channel 01 to the second flow channel 02, and this flow direction is the first operating condition. The silencing component 300 is located in the second flow channel 02, and the flow area of ​​the valve port 120 is 3.14 mm². 2 The resulting data is shown in the table below:

[0069] The subcooling in the table refers to the subcooling of the refrigerant before it flows through the valve port 120, which is the subcooling before the valve.

[0070] In the comparative example using the traditional scheme, without setting the extended flow channel 130, as the number of steps of the indoor unit's electronic expansion valve decreases after stabilization, the opening of the valve body 100 closes less, and the subcooling before the valve increases accordingly. The electronic expansion valve has obvious airflow noise that can be heard by the human ear. At 480 steps and 240 steps, the noise value was measured to increase from 43.65dB to 50.58dB, an increase of 15.8%, and the noise value increased significantly.

[0071] In the improved example applying the technical solution provided in this application, as the number of steps of the indoor unit's electronic expansion valve decreases after stabilization, the subcooling before the valve increases as the opening of the valve body 100 decreases. When the number of steps of the indoor unit's electronic expansion valve is the same as that of the comparative example after stabilization, the human ear still perceives only a slight airflow sound from the electronic expansion valve. Although the noise level also shows an upward trend, the measured noise level increases from 42.54 dB to 43.68 dB, an increase of 2.6%. The increase in decibel value is significantly lower than that of the comparative example. The opening of the valve body 100 continues to decrease until the sound is clearly perceived. The noise level of the airflow was measured, and the noise level increased from 42.54 dB to 44.76 dB, an increase of 4.9%, but still showed a significant reduction. At the same opening degree, after 480 steps, the noise level of 42.54 dB measured by the improved example was less than that of 43.65 dB measured by the comparative example. When the opening degree was reduced, after 240 steps, the noise level of 43.68 dB measured by the improved example was significantly less than that of 50.58 dB measured by the comparative example. Applying the technical solution provided in this application can significantly reduce noise and improve the user experience.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes: The valve body (100) has a connecting cavity (110), a valve port (120) and an extended flow channel (130) connected in sequence. The diameter of the valve port (120) is d, and the length of the extended flow channel (130) is L1, where 1.5d≤L1≤10d. A first flow channel (01) and a second flow channel (02) are connected. The first flow channel (01) is connected to the connecting cavity (110). The valve port (120) is located between the first flow channel (01) and the second flow channel (02). The second flow channel (02) is connected to the valve port (120) through the extended flow channel (130). A valve needle (200) is movably disposed within the communicating cavity (110), and the valve needle (200) is movable relative to the valve port (120) to regulate the flow rate at the valve port (120); A noise reduction assembly (300) is disposed within the first flow channel (01) and / or the second flow channel (02), the noise reduction assembly (300) comprising at least one porous element.

2. The electronic expansion valve according to claim 1, characterized in that, The extended flow channel (130) has a straight hole structure.

3. The electronic expansion valve according to claim 1, characterized in that, The extended flow channel (130) has multiple flow sections (131) that are connected sequentially. Along the direction of the valve port (120) away from the connecting cavity (110), the inner diameter of the multiple flow sections (131) gradually increases.

4. The electronic expansion valve according to claim 3, characterized in that, There is a transition section between two adjacent flow sections (131), and the two adjacent flow sections (131) are connected through the transition section.

5. The electronic expansion valve according to claim 4, characterized in that, The transition section is a straight section (132), and the inner wall of the straight section (132) has an angle with the axis of the extended flow channel (130), the angle being between 0° and 45°.

6. The electronic expansion valve according to claim 4, characterized in that, The transition segment is an arc segment, and the arc segment forms the transition segment.

7. The electronic expansion valve according to claim 3, characterized in that, The flow area of ​​the valve port (120) is S, and the flow area of ​​the flow section (131) near one end of the valve port (120) is S1, where 1.01S≤S1≤1.7S. Along the direction from the valve port (120) towards the silencer assembly (300), the flow area of ​​the remaining flow sections (131) is S. n 1.01S n-1 ≤S n ≤1.7S n-1 , n≥2.

8. The electronic expansion valve according to claim 3, characterized in that, The extended flow channel (130) has a first end and a second end disposed opposite to each other along the extension direction, the second end being disposed away from the valve port, and the flow area of ​​the second end being 1 to 2 times the flow area of ​​the first end.

9. The electronic expansion valve according to claim 1, characterized in that, The noise reduction assembly (300) includes a first noise reduction block (310) and a second noise reduction block (320) spaced apart along the axial direction. The first noise reduction block (310) has at least one first flow hole (311), and the second noise reduction block (320) has at least one second flow hole (321). The projections of the first flow hole (311) and the second flow hole (321) in the axial direction do not coincide, or partially coincide.

10. The electronic expansion valve according to claim 9, characterized in that, The first flow hole (311) is coaxially arranged with the first noise reduction block (310).

11. The electronic expansion valve according to claim 9, characterized in that, When there are multiple second flow holes (321), the multiple second flow holes (321) are arranged in a ring at intervals around the axis of the second noise reduction block (320).

12. The electronic expansion valve according to claim 9, characterized in that, The total flow area of ​​the first flow hole (311) is T1, and S≤T1≤5S.

13. The electronic expansion valve according to claim 9, characterized in that, The total flow area of ​​the second flow hole (321) is T2, S≤T2≤5S.

14. The electronic expansion valve according to claim 9, characterized in that, The diameter of the first noise-absorbing block (310) is D1, the diameter of the second noise-absorbing block (320) is D2, 2d≤D1≤10d, and / or 2d≤D2≤10d.

15. The electronic expansion valve according to claim 1, characterized in that, The distance from the end of the extended flow channel (130) away from the valve port (120) to the end face of the silencer assembly (300) facing the extended flow channel (130) is L2, where 0.5d≤L2≤10d.

16. The electronic expansion valve according to claim 1, characterized in that, The valve body (100) includes a main body (101) and an extension section (102), the extension section (102) having the extension flow channel (130), and the extension section (102) and the main body (101) being fixedly connected to each other.

17. The electronic expansion valve according to claim 1, characterized in that, The valve body (100) includes a main body (101) and an extension section (102), the extension section (102) having the extension flow channel (130), and the extension section (102) and the main body (101) are integrally formed together.

Images