Electronic expansion valve, indoor unit and heating and ventilation system

Abstract

The invention discloses an electronic expansion valve, an indoor unit and a heating and ventilation system.The electronic expansion valve comprises a valve body, a valve seat and a valve element, the valve seat is provided with a first hole channel, a second hole channel and an opening hole communicating with the first hole channel and the second hole channel, and the valve element is movably arranged in the valve seat; the pipeline assembly comprises a first pipeline and a second pipeline, the first pipeline comprises a first pipe section and a second pipe section which is connected to the valve seat and communicated with the first hole channel, and the second pipeline comprises a third pipe section and a fourth pipe section which are connected to the valve seat and communicated with the second hole channel; the filtering part is arranged in the first pipeline and / or the second pipeline; the diameter of the second pipe section is larger than that of the first pipe section, and the diameter of the third pipe section is larger than that of the fourth pipe section. By means of the arrangement, the problems that due to the fact that filtering devices are arranged in front of and behind the electronic expansion valve, large space is occupied, and noise of the electronic expansion valve is large are solved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an electronic expansion valve, an indoor unit, and a heating and ventilation system. Background Art

[0002] Electronic expansion valves (EVVs) can be adjusted to varying openings within a certain range, making them commonly used in air conditioning systems to regulate refrigerant flow and achieve throttling and pressure reduction. Filters are typically connected to the front and rear of EVVs to filter out impurities. However, due to the complex piping layout in air conditioning systems, these devices take up considerable space. Furthermore, the high-temperature, high-pressure refrigerant passing through the EVVs creates a high level of noise, resulting in a poor user experience. Summary of the Invention

[0003] The present application provides an electronic expansion valve, which aims to solve the problems of arranging filtering devices before and after the electronic expansion valve, which takes up a large space, and the electronic expansion valve making a lot of noise.

[0004] In order to solve the above technical problems, the present application provides an electronic expansion valve, comprising: A valve body comprising a valve seat and a valve core, wherein the valve seat has a first channel and a second channel, and an opening hole connecting the first channel and the second channel, and the valve core is movably disposed in the valve seat and is used to adjust the flow rate of the fluid allowed to flow through the opening hole; a pipeline assembly comprising a first pipeline and a second pipeline, wherein the first pipeline comprises a first pipeline segment and a second pipeline segment connected to the valve seat and communicating with the first channel, and the second pipeline comprises a third pipeline segment and a fourth pipeline segment connected to the valve seat and communicating with the second channel; a filter element, disposed in the first pipe and / or the second pipe; The first channel and the second channel are arranged at an angle, the diameter of the second pipe segment is larger than the diameter of the first pipe segment, and the diameter of the third pipe segment is larger than the diameter of the fourth pipe segment.

[0005] In some embodiments of the present application, there are two filter elements, namely a first filter element and a second filter element. The first filter element is arranged in the second pipe section, and the second filter element is arranged in the third pipe section.

[0006] In some embodiments of the present application, the first filter element extends into the valve seat to a depth of 1-4 mm relative to the outer surface of the valve seat; the second filter element extends into the valve seat to a depth of 1-5 mm relative to the outer surface of the valve seat.

[0007] In some embodiments of the present application, the first filter element extends into the valve seat to a depth of 1-3 mm relative to the outer surface of the valve seat.

[0008] In some embodiments of the present application, the second filter element extends into the valve seat to a depth of 2-4 mm relative to the outer surface of the valve seat.

[0009] In some embodiments of the present application, the outside of the valve seat is provided with a first mounting groove connected to the first channel and a second mounting groove connected to the second channel, the end of the second pipe segment is provided in the first mounting groove, and the end of the third pipe segment is provided in the second mounting groove.

[0010] In some embodiments of the present application, the end surface of the first filter element facing the opening hole is flush with the end surface of the second pipe segment facing the opening hole; and / or, The end surface of the second filter element facing the opening hole is flush with the end surface of the third pipe section facing the opening hole.

[0011] In some embodiments of the present application, the first pipe further includes a first flared pipe section disposed between the first pipe section and the second pipe section, wherein the diameter of the first flared pipe section gradually increases from the first pipe section toward the second pipe section; and / or, The second pipe further includes a second expanded pipe section disposed between the third pipe section and the fourth pipe section, wherein a diameter of the second expanded pipe section gradually increases from the fourth pipe section toward the third pipe section.

[0012] In some embodiments of the present application, in the axial direction of the first pipe, the length of the filter element is equal to the length of the second pipe segment, or is less than the sum of the lengths of the first expanded pipe segment and the second pipe segment; and / or, In the axial direction of the second pipe, the length of the filter element is equal to the length of the third pipe section, or is less than the sum of the lengths of the second expanded pipe section and the third pipe section.

[0013] In some embodiments of the present application, the filter element includes a mounting ring and a filter body connected to the mounting ring, and the filter body allows fluid to pass through and is used to filter impurities in the fluid.

[0014] In some embodiments of the present application, the inner diameter of the mounting ring is larger than the diameter of any one of the first channel and the second channel.

[0015] In some embodiments of the present application, a diverter portion is provided at one end of the filter body away from the mounting ring, and the diverter portion is used to divert the fluid flowing toward the diverter portion.

[0016] In some embodiments of the present application, when the diverter is disposed in the first pipe, the axis of the diverter is coaxial with the axis of the first pipe; and / or, When the separation portion is provided in the second pipe, the axis of the diverter portion is coaxially arranged with the axis of the second pipe.

[0017] In some embodiments of the present application, the filter body is arranged to extend along the axial direction of either the first pipe or the second pipe.

[0018] In some embodiments of the present application, the axial length of the filter body ranges from 24 to 26 mm.

[0019] In some embodiments of the present application, the filter body is configured as a porous tubular structure; or, the filter body is configured as a porous damping structure; or, the filter body is configured as a porous sound-absorbing structure made of sound-absorbing material.

[0020] In some embodiments of the present application, when the filter body is configured as a porous tubular structure, the filter body includes a tubular filter screen; or, the filter body includes a tubular filter screen, and a multi-layer mesh structure is provided inside the tubular filter screen, and adjacent layers of the mesh structure are spaced apart.

[0021] In order to solve the above technical problems, the present application also provides an indoor unit, comprising: heat exchangers; fans; and, The above-mentioned electronic expansion valve is connected to the heat exchanger pipeline.

[0022] In order to solve the above technical problems, the present application also provides a HVAC system, comprising: outdoor unit; and The above-mentioned indoor unit, the outdoor unit is connected to the indoor unit through a pipeline.

[0023] The beneficial effects of the present application are as follows: by limiting the diameter of the second pipe section near the opening hole to be larger than the diameter of the first pipe section far from the opening hole, and the diameter of the third pipe section near the opening hole to be larger than the diameter of the fourth pipe section far from the opening hole, space is provided for installing a filter element, avoiding the need to arrange additional filter devices before and after the electronic expansion valve, thereby achieving an integrated filter element design. Compared with the conventional arrangement of filter devices before and after the electronic expansion valve, the integration of the filter element in the pipeline can reduce the internal space occupied by the indoor unit, and can also streamline and optimize the internal pipelines, which undoubtedly reduces costs. On the other hand, due to the sudden change in the diameter of the first pipe and the second pipe, it helps to reduce the fluid flow rate and a certain local pressure to a certain extent, reduce the noise generated by fluid impact, and at the same time, weaken the flow characteristics of the fluid and balance the pressure pulsation in the pipe through the filter element, such as dispersing large bubbles that may form in the pipe, weakening end flow and cavitation, and reducing the formation of vortexes, thereby reducing the conversion efficiency of fluid kinetic energy into acoustic energy, thereby reducing the noise of the electronic expansion valve during operation, and thus improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic structural diagram of an electronic expansion valve provided in one embodiment of the present application; Figure 2 A schematic diagram of the planar structure of an electronic expansion valve provided in one embodiment of the present application; Figure 3 A schematic cross-sectional view of an electronic expansion valve according to an embodiment of the present application; Figure 4 A schematic diagram of the cross-sectional structure of a valve body provided in one embodiment of the present application; Figure 5 A schematic diagram of the overall structure of a valve body provided in one embodiment of the present application; Figure 6 A schematic cross-sectional view of a first pipe and a first filter element provided in one embodiment of the present application; Figure 7 This is a schematic structural diagram of a first filter element provided in one embodiment of the present application.

[0026] Reference numerals: 20. Electronic expansion valve; 21. Valve body; 211. Valve seat; 2111. First channel; 2112. Second channel; 2113. Opening hole; 2114. First mounting slot; 2115. Second mounting slot; 212. Valve core; 22. First pipeline; 221. First pipe section; 222. Second pipe section; 223. First flared pipe section; 23. Second pipeline; 231. Third pipe section; 232. Fourth pipe section; 233. Second flared pipe section; 24. First filter element; 241. Mounting ring; 242. Filter body; 243. Diverter; 25. Second filter element. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] The present application provides an embodiment of a heating and ventilation system (not shown) comprising an outdoor unit and an indoor unit connected by a pipeline. The heating and ventilation system may also include, but is not limited to, a multi-split unit, a heat pump, and other systems for heating or cooling. It should be noted that the outdoor unit, multi-split unit, and heat pump are all relatively mature existing technologies in this field, and this application does not make significant improvements to the outdoor unit, multi-split unit, and heat pump. Therefore, this application does not provide a detailed description of the structure of the outdoor unit, multi-split unit, and heat pump.

[0029] The embodiment of the present application also proposes an indoor unit, which includes a heat exchanger, a fan and an electronic expansion valve 20, and the electronic expansion valve 20 is connected to the heat exchanger pipeline. The heat exchanger is used to achieve cooling or heating functions through heat transfer, and the fan is used to draw indoor air into the indoor unit, and after being processed by the heat exchanger, the processed air is blown to every corner of the room. It should be noted that the indoor unit may also include but is not limited to a control module and an external panel. The external panel is provided with components such as an air guide plate and a display component for displaying temperature and mode. The air guide plate and the display component are electrically connected to the control module. The heat exchanger, the fan and the electronic expansion valve 20 are all electrically connected to the control module. The control module is used to control the operation of various components of the indoor unit.

[0030] Among them, the refrigerant flow rate is regulated between the outdoor unit and the indoor unit through the electronic expansion valve 20, which plays the role of throttling and reducing pressure, thereby achieving high efficiency and energy saving, safe and stable operation of the cooling / heating system, and improving the ability of the equipment to adapt to complex working conditions. However, the current indoor unit is usually connected to a filter device for filtering fluid impurities before and after the electronic expansion valve 20. Since the pipeline arrangement in the air-conditioning system is relatively complex, this undoubtedly takes up a large space. In addition, during use, the high-temperature and high-pressure refrigerant is noisy when passing through the electronic expansion valve 20, resulting in a poor user experience. Based on this, the present application provides an electronic expansion valve 20, which aims to solve the problem of arranging filter devices before and after the electronic expansion valve 20, which takes up a large space, and the problem of the electronic expansion valve 20 making a lot of noise.

[0031] The present application embodiment provides an electronic expansion valve 20, please refer to Figures 1 to 3The electronic expansion valve 20 includes a valve body 21, a pipe assembly, and a filter. The valve body 21 includes a valve seat 211 and a valve core 212. The valve seat 211 has a first channel 2111 and a second channel 2112, as well as an opening hole 2113 connecting the first channel 2111 and the second channel 2112. The valve core 212 is movably disposed within the valve seat 211 and is used to adjust the flow rate of fluid allowed to flow through the opening hole 2113. The pipe assembly includes a first pipe 22 and a second pipe 23. The first pipe 22 includes a first pipe section 221 and a second pipe section 222 connected to the valve seat 211 and connected to the first channel 2111. The second pipe 23 includes a third pipe section 231 and a fourth pipe section 232 connected to the valve seat 211 and connected to the second channel 2112. The filter is disposed within the first pipe 22 and / or the second pipe 23.

[0032] The first channel 2111 and the second channel 2112 are arranged at an angle, the diameter of the second pipe section 222 is larger than the diameter of the first pipe section 221 , and the diameter of the third pipe section 231 is larger than the diameter of the fourth pipe section 232 .

[0033] Based on the arrangement of the above solution, by limiting the diameter of the second pipe section 222 near the opening hole 2113 to be larger than the diameter of the first pipe section 221 far from the opening hole 2113, and the diameter of the third pipe section 231 near the opening hole 2113 to be larger than the diameter of the fourth pipe section 232 far from the opening hole 2113, space can be provided for installing the filter element, avoiding the need for additional filter devices to be arranged before and after the electronic expansion valve 20, thereby achieving an integrated filter element design. Compared with the previous arrangement of filter devices before and after the electronic expansion valve 20, the filter element is integrated into the pipeline, which can reduce the internal space occupied by the indoor unit, and can also streamline and optimize the internal pipeline, which undoubtedly reduces costs. On the other hand, due to the sudden change in the diameter of the first pipe 22 and the second pipe 23, to a certain extent, it helps to reduce the fluid flow rate and a certain local pressure, reduce the noise generated by fluid impact, and at the same time, through the filter element, weaken the flow characteristics of the fluid and balance the pressure pulsation in the pipe, such as dispersing large bubbles that may form in the pipe, weakening end flow and cavitation, and reducing the formation of vortexes, thereby reducing the conversion efficiency of fluid kinetic energy to acoustic energy, thereby reducing the noise of the electronic expansion valve 20 during operation, and thus improving the user experience.

[0034] It should be noted that the valve seat 211 provides a mounting interface and a refrigerant flow channel. The mounting interface can be an opening or groove formed on the exterior of the valve seat 211 for mounting the first pipe 22 and the second pipe 23. The first channel 2111, the second channel 2112, and the aperture 2113 define a refrigerant flow channel. The refrigerant can be a mixture of gas and liquid. The valve seat 211 includes a cavity within which the valve core 212 moves. The aperture 2113 is adjusted by moving it up and down to adjust the refrigerant flow rate, thereby achieving the throttling and pressure-reducing function of the electronic expansion valve 20.

[0035] It is understandable that the valve core 212 can be moved by structures such as a stepping motor and a screw, or by electromagnetic force. As long as the valve core 212 can be driven to move to open or close the opening hole 2113, no further restrictions will be made here.

[0036] Furthermore, in some embodiments of the present application, two filters are provided, namely a first filter 24 and a second filter 25. The first filter 24 is provided within the second pipe section 222, and the second filter 25 is provided within the third pipe section 231. Compared to the conventional method of providing filtering devices before and after the electronic expansion valve 20, the two filters in the embodiments of the present application are both provided within the pipe. This integrated design not only avoids occupying the internal space of the indoor unit, but also effectively optimizes the internal piping, reduces the number of installation steps during the production process, and helps improve the efficiency of the overall assembly of the unit.

[0037] In an embodiment of the present application, the electronic expansion valve 20 can be connected to the compressor pipeline through a first pipe 22, and to the evaporator pipeline through a second pipe 23. Regardless of the cooling mode or the heating mode, since filter elements are provided at the inlet and outlet of the refrigerant flow channel, before the refrigerant fluid enters the electronic expansion valve 20, the structural characteristics of the filter element can be utilized to crush large bubbles in the gas-liquid two-phase flow, and weaken fluid phenomena such as end flow and vortex, so that the gas-liquid mixing is more uniform, thereby reducing the noise of the electronic expansion valve 20, and then reducing the noise impact of the indoor unit, so as to provide users with a better user experience.

[0038] Among them, the first filter element 24 and the second filter element 25 are both arranged close to the opening hole 2113. The reason why the first filter element 24 and the second filter element 25 are both arranged close to the opening hole 2113 is to better improve the noise reduction effect; if the opening of the first filter element 24 at one end away from the first channel 2111 and the distance from the opening hole 2113 is six times the diameter of the first channel 2111, even if the refrigerant in the first pipe 22 passes through the first filter element 24 to mix into a more uniform gas-liquid two-phase flow, there is still a distance from the inlet of the electronic expansion valve 20. The uniform gas-liquid two-phase flow mixed after passing through the first filter element 24 will aggregate into large bubbles again, which will cause the large bubbles to generate an explosive shock wave when entering the electronic expansion valve 20, and the kinetic energy of the fluid is then converted into sound energy. Therefore, it is necessary to arrange the first filter element 24 and the second filter element 25 close to the opening hole 2113, which can greatly ensure that the refrigerant entering the electronic expansion valve 20 is a uniformly mixed gas-liquid two-phase flow, thereby achieving noise reduction of the electronic expansion valve 20.

[0039] In addition, impurities and particles in the refrigerant are intercepted by the first filter element 24 and the second filter element 25 to prevent these impurities and particles from entering the interior of the electronic expansion valve 20, thereby protecting the normal operation of the electronic expansion valve 20 and also helping to extend the service life of the electronic expansion valve 20.

[0040] Because the opening hole 2113 is located within the electronic expansion valve 20, the first filter element 24 and the second filter element 25 can be positioned close to the opening hole 2113. Based on the structural design of the electronic expansion valve 20 and if structural coordination permits, the first filter element 24 and the second filter element 25 can be inserted into the electronic expansion valve 20. The first filter element 24 extends into the valve seat 211 to a depth of 1-4 mm relative to the outer surface of the valve seat 211; the second filter element 25 extends into the valve seat 211 to a depth of 1-5 mm relative to the outer surface of the valve seat 211.

[0041] Such a setting, on the one hand, ensures that the first filter element 24 and the second filter element 25 are set sufficiently close to the opening hole 2113, so that the evenly mixed refrigerant passing through the first filter element 24 or the second filter element 25 directly enters the valve seat 211, avoiding the re-aggregation of large bubbles after passing through the first filter element 24 or the second filter element 25. On the other hand, it conforms to the coordination between the structures, so that the first filter element 24 and the second filter element 25 can be reasonably assembled and coordinated with the valve seat 211. In addition, it can also fix the filter elements to a certain extent, thereby increasing the connection stability between the structures.

[0042] It should be noted that the depth to which the first filter element 24 and the second filter element 25 extend into the valve seat 211 can be determined according to the thickness of the valve body 21 itself. For example, if the structural thickness of the valve body 21 is thick enough, the depth to which the first filter element 24 and the second filter element 25 can be extended is slightly greater; if the structural thickness of the valve body 21 is relatively thin, it should not be extended too much to avoid affecting the connection and coordination between the structures and causing failure of normal operation.

[0043] In embodiments of the present application, the first channel 2111 and the second channel 2112 can be arranged vertically, with the opening 2113 located between the first channel 2111 and the second channel 2112. The opening 2113 is a precisely machined, tiny aperture, and the valve core 212 cooperates with the opening 2113 to limit the flow of the refrigerant. In some embodiments of the present application, the first filter element 24 extends into the valve seat 211 to a depth of 1-3 mm relative to the outer surface of the valve seat 211. In other words, the end surface of the first filter element 24 facing the opening 2113 is 1-3 mm from the opening 2113. This arrangement ensures that the first filter element 24 is as close to the opening 2113 as possible, shortening the travel distance of the evenly mixed refrigerant after passing through the first filter element 24 into the opening 2113. This effectively reduces the probability of large bubbles being generated, thereby improving the noise reduction effect.

[0044] It is understood that if the depth of the first filter element 24 extending into the valve seat 211 is too great, the structural characteristics of the valve body 21 itself may be damaged, hindering the normal operation of the electronic expansion valve 20. If it is too small, the first filter element 24 will not be close enough to the opening 2113, affecting the noise reduction effect. Therefore, the depth of the first filter element 24 extending into the valve seat 211 can be 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, etc.

[0045] In some embodiments of the present application, the second filter element 25 extends into the valve seat 211 to a depth of 2-4 mm relative to the outer surface of the valve seat 211. The second filter element 25 is connected to the second channel 2112, which extends along the direction of movement of the valve core 212 and is aligned with the axial direction of the valve seat 211. During the processing and production of the valve body 21, the axial length of the valve body 21 can be relatively long, so the depth of the second filter element 25 extending into the valve seat 211 can be slightly greater. In other words, the end surface of the second filter element 25 facing the opening 2113 is 2-4 mm away from the opening 2113. This arrangement ensures that the second filter element 25 is as close to the opening 2113 as possible, shortening the travel distance of the evenly mixed refrigerant after passing through the second filter element 25 into the opening 2113. This effectively reduces the probability of large bubbles being generated, thereby improving the noise reduction effect.

[0046] It is understood that if the depth of the second filter element 25 extending into the valve seat 211 is too great, the structural characteristics of the valve body 21 itself may be damaged, hindering the normal operation of the electronic expansion valve 20. If it is too small, the second filter element 25 will not be close enough to the opening 2113, affecting the noise reduction effect. Therefore, the depth of the second filter element 25 extending into the valve seat 211 can be 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, etc.

[0047] Please refer to Figures 3 to 5 In some embodiments of the present application, the exterior of the valve seat 211 is provided with a first mounting groove 2114 communicating with the first channel 2111 and a second mounting groove 2115 communicating with the second channel 2112. The end of the second pipe segment 222 is disposed within the first mounting groove 2114, and the end of the third pipe segment 231 is disposed within the second mounting groove 2115. In the embodiments of the present application, the depth of the first mounting groove 2114 can be 1-3 mm, for example, 1 mm, 2 mm, or 3 mm; the depth of the second mounting groove 2115 can be 2-4 mm, for example, 2 mm, 3 mm, or 4 mm.

[0048] In this arrangement, the first mounting groove 2114 provides installation space for the ends of the first pipe 22 and the first filter element 24, and the second mounting groove 2115 provides installation space for the ends of the second pipe 23 and the second filter element 25, which facilitates the assembly of the electronic expansion valve 20 and the subsequent maintenance of the electronic expansion valve 20.

[0049] The first filter element 24 can be screwed into the first pipe 22, that is, the first filter element 24 is screwed into the second pipe section 222. The second filter element 25 can be screwed into the second pipe 23, that is, the second filter element 25 is screwed into the third pipe section 231. The depth of the first mounting groove 2114 secures the first filter element 24 and the first pipe 22, while the depth of the second mounting groove 2115 secures the second filter element 25 and the second pipe 23, thereby securing the first filter element 24 and the second filter element 25. Furthermore, the first pipe 22 and the second pipe 23 can be reinforced with fastening structures such as clamps or snap rings to more securely connect them to the valve body 21.

[0050] Please refer to Figure 3 and Figure 6 In some embodiments of the present application, the end surface of the first filter element 24 facing the opening hole 2113 is flush with the end surface of the second pipe section 222 facing the opening hole 2113; and / or The end surface of the second filter element 25 facing the opening hole 2113 is flush with the end surface of the third pipe section 231 facing the opening hole 2113 .

[0051] Specifically, the first filter element 24 is screwed into the first pipe 22 until the end surface of the first filter element 24 facing the opening hole 2113 is flush with the end surface of the second pipe section 222 facing the opening hole 2113. The second filter element 25 is screwed into the second pipe 23 until the end surface of the second filter element 25 facing the opening hole 2113 is flush with the end surface of the second pipe section 222 facing the opening hole 2113. The bottoms of the first mounting groove 2114 and the second mounting groove 2115 are designed to be flat. The end surfaces of the first filter element 24 and the first pipe 22 are aligned with the bottom plane of the first mounting groove 2114, and the end surfaces of the second filter element 25 and the second pipe 23 are aligned with the bottom plane of the second mounting groove 2115. This arrangement effectively ensures the sealing between the first and second pipes 22, 23 and the valve seat 211, while also improving the assembly accuracy of the electronic expansion valve 20 and reducing assembly errors.

[0052] Please refer to Figures 1 to 3 In some embodiments of the present application, the first pipe 22 further includes a first flared pipe section 223 disposed between the first pipe section 221 and the second pipe section 222, wherein the diameter of the first flared pipe section 223 gradually increases from the first pipe section 221 toward the second pipe section 222; and / or The second pipe 23 further includes a second expanded pipe section 233 disposed between the third pipe section 231 and the fourth pipe section 232 . The diameter of the second expanded pipe section 233 gradually increases from the fourth pipe section 232 to the third pipe section 231 .

[0053] Specifically, the first pipe 22 has a first flared pipe section 223, and the second pipe 23 has a second flared pipe section 233. In this way, regardless of whether it is a heating mode or a cooling mode, when the refrigerant flows from a small-diameter pipe to a large-diameter pipe, under the action of the first flared pipe section 223 or the second flared pipe section 233, the refrigerant can gradually transition to the large-diameter pipe. For example, the fluid in the first pipe section 221 can gradually transition to the second pipe section 222 through the first flared pipe section 223. The first flared pipe section 223 can reduce flow separation and energy dissipation, thereby reducing eddy currents and pressure pulsations, which helps to reduce noise.

[0054] In some embodiments of the present application, in the axial direction of the first pipe 22, the length of the filter element is equal to the length of the second pipe section 222, or is less than the sum of the lengths of the first expanded pipe section 223 and the second pipe section 222; and / or, In the axial direction of the second pipe 23 , the length of the filter element is equal to the length of the third pipe section 231 , or is smaller than the sum of the lengths of the second expanded pipe section 233 and the third pipe section 231 .

[0055] Specifically, the axial length of the first filter element 24 in the first pipe 22 is equal to the length of the second pipe section 222, or is less than the sum of the lengths of the first flared pipe section 223 and the second pipe section 222. The structural characteristics of the first filter element 24 can weaken phenomena such as end flow and vortex flow of the fluid, and crush large bubbles in the gas-liquid two-phase flow. Therefore, it is necessary to ensure the length of the first filter element 24 within the second pipe section 222. In this way, when the refrigerant flows through the second pipe section 222, the first filter element 24 can ensure that large bubbles in the refrigerant are crushed throughout the entire process, effectively ensuring more uniform mixing of gas and liquid, thereby more effectively reducing noise. The axial length of the second filter element 25 in the second pipe 23 is equal to the length of the third pipe section 231, or less than the sum of the lengths of the second expanded pipe section 233 and the third pipe section 231. The structural characteristics of the second filter element 25 can weaken the end flow, vortex and other phenomena of the fluid, and crush large bubbles in the gas-liquid two-phase flow. Therefore, it is necessary to ensure the length of the second filter element 25 in the third pipe section 231. In this way, when the refrigerant flows through the third pipe section 231, the second filter element 25 can ensure that the large bubbles in the refrigerant are crushed throughout the entire process, effectively ensuring that the gas-liquid mixing is more uniform, so as to more effectively reduce noise.

[0056] In the cooling mode, the refrigerant flows from the first pipe 22 to the second pipe 23. When the refrigerant flows through the second pipe section 222, the first filter element 24 can improve the crushing effect of large bubbles in the refrigerant. Then, the second filter element 25 is used to evenly mix the fluid to minimize noise during the entire operation process, thereby achieving efficient noise reduction of the electronic expansion valve 20, thereby better providing users with a comfortable user experience.

[0057] In the heating mode, the refrigerant flows from the second pipe 23 to the first pipe 22. When the refrigerant flows through the third pipe section 231, the second filter element 25 can improve the crushing effect of large bubbles in the refrigerant. Then, the first filter element 24 is used to evenly mix the fluid to minimize noise during the entire operation process, thereby achieving efficient noise reduction of the electronic expansion valve 20, thereby better providing users with a comfortable user experience.

[0058] It should be noted that the first filter element 24 and the second filter element 25 have the same structure. The diameter of the outlet of the first filter element 24 toward the opening 2113 is larger than the diameter of the first channel 2111, and the diameter of the outlet of the second filter element 25 toward the opening 2113 is larger than the diameter of the second channel 2112. For ease of explanation, the structures of the first filter element 24 and the second filter element 25 will be described below using the first filter element 24 as an example.

[0059] Please refer to Figure 3 and Figure 7In some embodiments of the present application, the filter element includes a mounting ring 241 and a filter body 242 connected to the mounting ring 241. The filter body 242 allows fluid to pass through and is used to filter impurities in the fluid. The mounting ring 241 is used to install the filter body 242. For example, when the mounting ring 241 is spun onto the first pipe 22 to secure the filter body 242 within the second pipe segment 222, the outer peripheral wall of the mounting ring 241 abuts against the inner wall of the second pipe segment 222 to seal the gap between the second pipe segment 222 and the mounting ring 241. When the mounting ring 241 is spun onto the second pipe 23 to secure the filter body 242 within the third pipe segment 231, the outer peripheral wall of the mounting ring 241 abuts against the inner wall of the third pipe segment 231 to seal the gap between the third pipe segment 231 and the mounting ring 241.

[0060] The mounting ring 241 and the filter body 242 can be integrally formed or detachably provided, which is not specifically limited here. The diameter of the mounting ring 241 is larger than the diameter of the filter body 242, so that a gap is provided between the outer wall of the filter body 242 and the inner wall of the second pipe section 222 or the third pipe section 231. On the one hand, the gap provides a storage space for intercepting impurities in the refrigerant. The filter body 242 of the first filter element 24 and the second filter element 25, which is located upstream of the refrigerant flow path, can effectively prevent impurities in the refrigerant from entering the valve body 21, thereby avoiding damage to the valve body 21. The filter body 242 of the first filter element 24 and the second filter element 25, which is located downstream of the refrigerant flow path, intercepts some wear debris flowing out of the valve body 21. The two filter elements work together to ensure the cleanliness of the refrigerant flow, extend the system life, and improve energy efficiency.

[0061] Specifically, the mounting ring 241 can be made of silicone or stainless steel, and the filter body 242 can be made of stainless steel or copper alloy. The filter body 242 has excellent corrosion resistance and high pressure resistance. This allows the filter body 242 to withstand high-temperature and high-pressure refrigerants, ensuring that the filter body 242 is not easily deformed, thereby stably filtering impurities in the refrigerant and crushing bubbles, thereby ensuring stable noise reduction of the valve body 21.

[0062] In some embodiments of the present application, the inner diameter of the mounting ring 241 is larger than the diameter of either the first orifice 2111 or the second orifice 2112. The mounting ring 241 forms a hollow passage, meaning that the diameter of the hollow passage is larger than both the first orifice 2111 and the second orifice 2112. This configuration improves the reliability and energy efficiency of the cooling / heating system by reducing flow rate, stabilizing pressure, and optimizing flow conditions, while also reducing turbulence and noise to a certain extent.

[0063] Please continue to refer to Figure 3 and Figure 7 Furthermore, in some embodiments of the present application, a diverter portion 243 is provided at one end of the filter body 242 away from the mounting ring 241. The diverter portion 243 is used to divert the fluid flowing toward the diverter portion 243. For example, in the cooling mode, for the first filter element 24, the end of the filter body 242 away from the mounting ring 241 is disposed toward the first pipe segment 221. In other words, the diverter portion 243 is disposed toward the passage of the first pipe segment 221. When the refrigerant flows toward the second pipe segment 222, it is diverted by the diverter portion 243 so that the refrigerant is diverted between the filter body 242 and the inner wall of the second pipe segment 222. In this way, the refrigerant can be mixed more evenly after passing through the filter body 242, and bubbles of different sizes can be fully crushed, thereby greatly reducing the noise of the valve body 21.

[0064] It should be noted that the diverter portion 243 can be composed of the outer surface of the end of the filter body 242 away from the mounting ring body 241, or it can be composed of the inner surface of the end of the filter body 242 away from the mounting ring body 241. The diverter portion 243 can be in the shape of a cone, a hemisphere or other arc-shaped shape, and no further restrictions are given here.

[0065] In some embodiments of the present application, when the diverter 243 is disposed in the first pipe 22 , the axis of the diverter 243 is coaxial with the axis of the first pipe 22 ; and / or, When the separation portion is provided in the second pipe 23 , the axis of the diverter portion 243 is coaxial with the axis of the second pipe 23 .

[0066] With such an arrangement, in the cooling / heating mode, the refrigerant can be diverted more evenly through the diversion portion 243, so that the refrigerant is mixed more evenly after passing through the filter body 242, thereby enhancing the force of weakening end flow, vortex and other phenomena, as well as the performance of crushing bubbles, thereby greatly reducing the noise of the valve body 21 and improving the noise reduction effect of the electronic expansion valve 20.

[0067] Furthermore, in some embodiments of the present application, the filter body 242 is arranged to extend axially along either the first pipe 22 or the second pipe 23. For example, when the filter body 242 is arranged in the first pipe 22, the filter body 242 is arranged to extend axially along the first pipe 22, thereby extending the length of the filter body 242 to increase the resistance along the way and the contact area with the refrigerant. In this way, when the refrigerant passes through the filter body 242 before entering the valve body 21, it is evenly mixed, ensuring the stability of the noise reduction of the valve body 21. When the filter body 242 is arranged in the second pipe 23, the filter body 242 is arranged to extend axially along the second pipe 23, and the first filter element 24 and the second filter element 25 cooperate with each other to effectively ensure the cleanliness of the refrigerant flow and the noise reduction effect of the valve body 21.

[0068] Specifically, in some embodiments of the present application, the axial length of the filter body 242 ranges from 24 to 26 mm. In the embodiments of the present application, if the axial length of the filter body 242 is less than 24 mm, the filtering effect of the filter body 242 and the effect of crushing bubbles in the refrigerant will be weakened; if the axial length of the filter body 242 is greater than 26 mm, it will be inconvenient to install the filter element, causing installation difficulties. Therefore, the axial length of the filter body 242 ranges from 24 mm, 24.5 mm, 25 mm, 25.5 mm, 26 mm, etc. The axial length of the filter body 242 can also be other values ​​between 24 and 26 mm, and is not specifically limited here.

[0069] In some embodiments of the present application, the filter body 242 is configured as a porous tubular structure; or, the filter body 242 is configured as a porous damping structure; or, the filter body 242 is configured as a porous sound-absorbing structure made of sound-absorbing material.

[0070] Specifically, when the filter body 242 is configured as a porous tubular structure, the filter body 242 may be a cylindrical filter screen, one end of which is connected to the mounting ring 241, and the other end is closed. The cylindrical filter screen can effectively intercept impurities in the refrigerant, reduce pressure drop, optimize flow rate, and make the refrigerant after passing through the filter body 242 more evenly mixed, thereby reducing the noise of the valve body 21. When the filter body 242 is configured as a porous damping structure, the porous damping structure can be a porous structure made of a damping material, such as a ceramic damping material, a metal-rubber composite material, a ceramic-polymer composite material, etc. The porous damping structure can absorb vibration energy in the fluid flow to reduce noise, smooth out pulse flow through the damping effect, and prevent instantaneous high pressure from impacting the valve or evaporator. It can also achieve flexible support, that is, disperse stress concentration caused by refrigerant pressure fluctuations, and reduce the risk of pipeline cracking; The filter body 242 is configured as a porous silencer structure made of sound-absorbing material, such as metal foam, alumina ceramics, etc. The porous silencer structure suppresses turbulent noise (such as water flow sound, air flow whistling), reduces the high-frequency noise generated by high-speed refrigerant flow, thereby achieving noise reduction of the valve body 21, and the porous silencer structure has no mechanical wear, a long service life, and wide adaptability.

[0071] In some embodiments of the present application, when the filter body 242 is configured as a porous tubular structure, the filter body 242 includes a tubular filter screen; or, the filter body 242 includes a tubular filter screen, and a multi-layer mesh structure is provided inside the tubular filter screen, and adjacent layers of the mesh in the multi-layer mesh structure are spaced apart.

[0072] Specifically, when filter body 242 is disposed within first pipe 22 and includes a tubular filter screen, one end of the tubular filter screen is fixedly connected to mounting ring 241, and the other end is disposed toward first pipe segment 221, with the ends being closed, thereby enabling refrigerant to be diverted through the ends. The outer peripheral wall of the tubular filter screen is provided with a large number of mesh holes, which may be circular, elliptical, polygonal, or other irregular shapes, and are not specifically limited herein.

[0073] Furthermore, a multi-layer mesh structure (not shown in the figure) is provided in the tubular filter. Adjacent layers of mesh in the multi-layer mesh structure are spaced apart. The multi-layer mesh structure improves the mixing effect of the refrigerant, thereby more fully crushing the bubbles in the gas-liquid two-phase flow, weakening the end flow noise of the fluid, and thereby greatly reducing the noise of the valve body 21.

[0074] The multi-layer mesh structure can be composed of multiple meshes of different diameters, each mesh being connected by a connector, such as a wire or a connecting rod. The multi-layer mesh structure can also be a filled structure, such as a metal foam filled structure or a porous ceramic coated structure, as long as it can filter the refrigerant or crush bubbles in the refrigerant, and is not limited here.

[0075] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0076] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body comprising a valve seat and a valve core, wherein the valve seat has a first channel and a second channel, and an opening hole connecting the first channel and the second channel, and the valve core is movably disposed in the valve seat and is used to adjust the flow rate of the fluid allowed to flow through the opening hole; a pipeline assembly comprising a first pipeline and a second pipeline, wherein the first pipeline comprises a first pipeline segment and a second pipeline segment connected to the valve seat and communicating with the first channel, and the second pipeline comprises a third pipeline segment and a fourth pipeline segment connected to the valve seat and communicating with the second channel; a filter element, disposed in the first pipe and / or the second pipe; The first channel and the second channel are arranged at an angle, the diameter of the second pipe segment is larger than the diameter of the first pipe segment, and the diameter of the third pipe segment is larger than the diameter of the fourth pipe segment.

2. The electronic expansion valve according to claim 1, characterized in that: There are two filter elements, namely a first filter element and a second filter element. The first filter element is arranged in the second pipe section, and the second filter element is arranged in the third pipe section.

3. The electronic expansion valve according to claim 2, characterized in that: The first filter element extends into the valve seat to a depth of 1-4 mm relative to the outer surface of the valve seat; the second filter element extends into the valve seat to a depth of 1-5 mm relative to the outer surface of the valve seat.

4. The electronic expansion valve according to claim 3, characterized in that: The first filter element extends into the valve seat to a depth of 1-3 mm relative to the outer surface of the valve seat.

5. The electronic expansion valve according to claim 3, characterized in that: The second filter extends into the valve seat to a depth of 2-4 mm relative to the outer surface of the valve seat.

6. The electronic expansion valve according to claim 1, characterized in that: The outside of the valve seat is provided with a first mounting groove communicating with the first channel and a second mounting groove communicating with the second channel, the end of the second pipe section is arranged in the first mounting groove, and the end of the third pipe section is arranged in the second mounting groove.

7. The electronic expansion valve according to claim 6, characterized in that: The end surface of the first filter element facing the opening hole is flush with the end surface of the second pipe section facing the opening hole; and / or, The end surface of the second filter element facing the opening hole is flush with the end surface of the third pipe section facing the opening hole.

8. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The first pipe further includes a first flared pipe section disposed between the first pipe section and the second pipe section, wherein the diameter of the first flared pipe section gradually increases from the first pipe section toward the second pipe section; and / or, The second pipe further includes a second expanded pipe section disposed between the third pipe section and the fourth pipe section, wherein a diameter of the second expanded pipe section gradually increases from the fourth pipe section toward the third pipe section.

9. The electronic expansion valve according to claim 8, characterized in that In the axial direction of the first pipe, the length of the filter element is equal to the length of the second pipe section, or is less than the sum of the lengths of the first expanded pipe section and the second pipe section; and / or, In the axial direction of the second pipe, the length of the filter element is equal to the length of the third pipe section, or is less than the sum of the lengths of the second expanded pipe section and the third pipe section.

10. The electronic expansion valve according to claim 1, wherein: The filter element includes a mounting ring and a filter body connected to the mounting ring. The filter body allows fluid to pass through and is used to filter impurities in the fluid.

11. The electronic expansion valve according to claim 10, characterized in that: The inner diameter of the mounting ring is larger than the diameter of either the first hole or the second hole.

12. The electronic expansion valve according to claim 10, wherein: A diverter is provided at one end of the filter body away from the mounting ring body, and the diverter is used to divert the fluid flowing toward the diverter.

13. The electronic expansion valve according to claim 12, wherein: When the diverter is disposed in the first pipe, the axis of the diverter is coaxial with the axis of the first pipe; and / or, When the separation portion is provided in the second pipe, the axis of the diverter portion is coaxially arranged with the axis of the second pipe.

14. The electronic expansion valve according to claim 10, wherein: The filter body is extended along the axial direction of either the first pipe or the second pipe.

15. The electronic expansion valve according to claim 14, characterized in that: The filter body has an axial length ranging from 24 to 26 mm.

16. The electronic expansion valve according to claim 10, wherein: The filter body is configured as a porous tubular structure; or, the filter body is configured as a porous damping structure; or, the filter body is configured as a porous sound-absorbing structure made of sound-absorbing material.

17. The electronic expansion valve according to claim 16, wherein: When the filter body is configured as a porous tubular structure, the filter body includes a tubular filter screen; or, the filter body includes a tubular filter screen, a multi-layer mesh structure is provided inside the tubular filter screen, and adjacent layers of the mesh structure are spaced apart.

18. An indoor unit, characterized in that: include: heat exchangers; Fan; as well as, The electronic expansion valve according to any one of claims 1 to 17, wherein the electronic expansion valve is connected to the heat exchanger pipeline.

19. A HVAC system, characterized in that: include: Outdoor unit; and The indoor unit according to claim 18, wherein the outdoor unit is connected to the indoor unit via a pipeline.

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