Valve structure and electronic expansion valve

Abstract

The present application provides a valve structure and an electronic expansion valve. The valve structure comprises a valve, a valve core assembly, and a filter screen assembly; the filter screen assembly comprises a filter screen; the valve core assembly is internally provided with a pressure equalization channel extending axially therethrough; the valve is provided with a valve port flow passage; the valve core assembly is disposed on the valve and is configured for regulating a flow rate of the valve port flow passage; the filter screen is arranged at one end of the valve core assembly close to the valve port flow passage and is located at an opening of the pressure equalization channel, the filter screen is configured for filtering a circulating medium entering the pressure equalization channel, and the filter screen protrudes toward the valve port flow passage, so that at the moment the valve core assembly opens the valve port flow passage, the circulating medium flowing through the valve port flow passage flows through a surface of the filter screen. The present application effectively utilizes a pressure difference at the moment a valve is opened, so that a large pressure difference at said moment drives a circulating medium to rapidly flush a filter screen, and thereby remove debris accumulated on the filter screen surface. This effectively prevents filter screen obstructions caused by debris, and enables filter screens to operate stably for a long period of time.

Description

Valve structure and electronic expansion valve

[0001] This application claims priority to the patent application filed on December 12, 2024, with application number 202423083249.1 and entitled "Valve Structure and Electronic Expansion Valve". Technical Field

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

[0003] As an important throttling component in the heat exchange field, the reliability of the electronic expansion valve is of paramount importance in ensuring the overall operation of the machine. Due to the very precise fit between its internal parts (especially the transmission components and threaded pairs inside the valve head), when large-sized impurities enter the electronic expansion valve through the refrigerant (i.e., the circulating medium), it is extremely easy to cause abnormal operation of the entire electronic expansion valve (including but not limited to problems such as malfunctioning valve switching).

[0004] With the increasingly complex piping environment of electronic expansion valves, the number of welding points between pipes and components is increasing. In addition, the welding and cleanliness control levels of different manufacturers vary, which often leads to oxide scale generated during welding or impurities in the components themselves due to poor cleanliness entering the refrigerant circulation system. These impurities eventually enter the precisely fitted electronic expansion valve along with the refrigerant, easily causing malfunctions. Therefore, higher requirements are placed on the impurity resistance performance of electronic expansion valves.

[0005] Existing electronic expansion valves typically incorporate internal filtering structures (such as filter screens) to filter impurities. These impurities accumulate on the filter structure, leading to a buildup problem in existing electronic expansion valves (especially internally balanced valves) during long-term operation. For example, impurities filtered by the filter screen accumulate on its surface and in the space between the filter screen and nearby structures (such as the support bracket for mounting the filter screen, valve head, etc.). This prevents effective cleaning of the accumulated impurities on the filter screen surface, thus compromising the long-term stable operation of the filter screen.

[0006] Application content

[0007] This application provides a valve structure and an electronic expansion valve to solve the problem that existing electronic expansion valves cannot effectively clean impurities on the filter structure, cannot guarantee the long-term stable operation of the filter screen, and thus affect the reliable operation of the electronic expansion valve.

[0008] To address the aforementioned problems, according to one aspect of this application, a valve structure is provided. The valve structure includes a valve, a valve core assembly, and a filter assembly. The filter assembly includes a filter screen. The valve core assembly has an axially penetrating balance channel inside. The valve has a valve orifice flow channel. The valve core assembly is disposed on the valve and used to regulate the flow rate of the valve orifice flow channel. The filter screen is disposed at one end of the valve core assembly near the valve orifice flow channel and located at the opening of the balance channel. The filter screen is used to filter the flowing medium entering the balance channel. The filter screen protrudes towards the valve orifice flow channel. At the instant the valve core assembly opens the valve orifice flow channel, the flowing medium passing through the valve orifice flow channel flows over the surface of the filter screen.

[0009] Furthermore, the filter assembly also includes a mounting base with an internal flow channel that communicates with a balance channel; the filter screen is fixedly mounted on the mounting base to filter impurities from the flow medium entering the flow channel.

[0010] Furthermore, the mounting base is fixed to the inner wall of the balance channel by at least one of riveting, welding or interference fit connection, and is located at the end of the balance channel near the valve port flow channel.

[0011] Furthermore, when the valve core assembly closes the valve port flow channel, at least a portion of the protrusion of the filter screen facing the valve port flow channel is located within the valve port flow channel.

[0012] Furthermore, the outer surface of the protruding portion of the filter screen facing the valve port flow channel has an arc-shaped surface or a flat surface; and / or, the shape of the protruding portion of the filter screen facing the valve port flow channel is one of spherical, frustum-shaped, cylindrical, or square; and / or, the mesh count of the filter screen is not less than 100 meshes.

[0013] According to another aspect of this application, an electronic expansion valve is provided, the electronic expansion valve including the valve structure described above; the valve includes a valve body assembly, the valve body assembly having a valve port flow channel and a first flow port communicating with the valve port flow channel inside, a valve core assembly being movably disposed on the valve body assembly to control the opening and closing of the valve port flow channel and the first flow port; a balance channel communicating with the valve port flow channel for balancing pressure.

[0014] Furthermore, the balance channel in the electronic expansion valve has a limiting step, which abuts against the filter assembly to axially limit the filter assembly; wherein, the filter assembly is fixed on the inner wall of the balance channel near the valve port flow channel.

[0015] Furthermore, the filter assembly also includes a mounting base, the interior of which has a flow channel that communicates with the balance channel; the filter screen is fixedly mounted on the mounting base to filter impurities in the flow medium entering the flow channel; wherein, the limiting step abuts against the mounting base to axially limit the mounting base; the mounting base (10) is fixed on the inner wall of the balance channel near the valve port flow channel.

[0016] Furthermore, the electronic expansion valve also includes a first flow pipe and a second flow pipe. The first flow pipe is disposed on the valve body assembly and communicates with the first flow port; the second flow pipe is disposed on the valve body assembly and communicates with the valve port flow channel. There is a pressure difference between the first flow port and the valve port flow channel. At the moment when the valve core assembly opens the valve port flow channel, the flowing medium passes through the valve port flow channel and washes the surface of the filter screen to remove impurities from the filter screen.

[0017] Furthermore, the filter assembly is fixed to the inner wall of the balance channel near the valve port flow channel by riveting, and a first limiting part is formed on the balance channel; wherein, there is a receiving space between the protruding part of the filter screen facing the valve port flow channel and the first limiting part, and at the moment when the valve core assembly opens the valve port flow channel, the circulating medium flows through the receiving space to remove impurities in the receiving space.

[0018] Furthermore, the filter assembly also includes a mounting base, which is fixed to the inner wall of the balance channel near the valve port flow channel by riveting, and forms a first limiting part on the balance channel; the mounting base and the filter screen are fixedly connected by riveting, and a second limiting part is formed on the mounting base; the first limiting part and the second limiting part abut against each other and are arranged in parallel; wherein, the protruding part of the filter screen facing the valve port flow channel forms a receiving space between the first limiting part and / or the second limiting part.

[0019] Furthermore, if the filtration area of ​​the filter screen is A, and the area of ​​the minimum flow cross section in the balance channel is B, then the ratio of A to B is not less than 1.2.

[0020] Furthermore, the valve core assembly includes a valve head, a guide sleeve, a sealing ring, and a screw drive component. The guide sleeve is fixedly mounted on the valve body assembly and seals with it. The sealing ring is sleeved on the outside of the valve head and seals with the inner wall of the guide sleeve. The valve head is movably mounted inside the guide sleeve and limits its movement with the inner wall of the guide sleeve. The valve head is used to open and close the valve port flow channel. A portion of the balance channel is located inside the valve head. The screw drive component and the valve head form a portion of the balance channel. The screw drive component is threaded with the valve head and drives the valve head to move. The minimum flow cross-section within the balance channel is located between the screw drive component and the valve head.

[0021] Applying the technical solution of this application, this application provides a valve structure, which includes a valve, a valve core assembly, and a filter assembly. The filter assembly includes a filter screen. The valve core assembly has an axially penetrating balance channel inside. The valve has a valve port flow channel. The valve core assembly is disposed on the valve and is used to regulate the flow rate of the valve port flow channel. The filter screen is disposed at one end of the valve core assembly near the valve port flow channel and is located at the opening of the balance channel. The filter screen is used to filter the flowing medium entering the balance channel. The filter screen protrudes towards the valve port flow channel. At the moment the valve core assembly opens the valve port flow channel, the flowing medium flowing through the valve port flow channel flows over the surface of the filter screen.

[0022] This application utilizes a filter screen that protrudes towards the valve's flow channel. When the valve core assembly opens the flow channel, the medium flowing through the channel passes over the filter screen's surface. This effectively utilizes the pressure difference at the moment of valve opening, allowing the large pressure difference to drive the medium to rapidly flush the filter screen, thus cleaning accumulated impurities and preventing clogging. This ensures the filter screen can operate stably for a long time. Furthermore, the filter screen effectively filters the medium entering the balance channel, preventing impurities from entering and ensuring reliable valve operation. Finally, by ensuring the uniqueness of the balance channel's inlet and outlet, this application guarantees that all medium entering the balance channel must pass through the filter screen, regardless of the type of medium. Under the same flow conditions, it can effectively block impurities from entering the precisely fitted structure of the valve, thereby avoiding the adverse effects of impurities on the precision structure, ensuring the long-term stable operation of the valve, and effectively improving the valve's anti-impurity performance. The valve structure proposed in this application only requires one filter screen to be installed on the balance channel, which is not only simple and low-cost, but also easy to assemble and maintain. It can also realize the standardized production of filter screen parts. Compared with the existing technology that requires welding two filters at the inlet and outlet of the electronic expansion valve, this application does not require multiple welding processes, reducing the risk of welding leakage. At the same time, the filter screen does not need to change with the size of the valve's inlet and outlet, realizing standardized production, which is more conducive to subsequent quality control and cost reduction and efficiency improvement, and is suitable for large-scale promotion and use. Attached Figure Description

[0023] 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:

[0024] Figure 1 shows a partial structural schematic diagram of the electronic expansion valve provided in an embodiment of this application;

[0025] Figure 2 shows a partial enlarged view of the electronic expansion valve provided in the embodiment of this application at the filter screen location.

[0026] The above-mentioned figures include the following reference numerals: 10, mounting base; 11, flow channel; 12, second limiting part; 20, filter screen; 21, receiving space; 30, valve core assembly; 31, balancing channel; 32, limiting step; 33, first limiting part; 34, valve head; 35, guide sleeve; 36, sealing ring; 37, screw drive component; 38, axial limiting component; 40, valve body assembly; 41, valve port flow channel; 42, first flow port; 50, first flow pipe; 60, second flow pipe. Detailed Implementation

[0027] 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.

[0028] As shown in Figures 1 and 2, an embodiment of this application provides a valve structure, which includes a valve, a valve core assembly 30, and a filter assembly. The filter assembly includes a filter screen 20. The valve core assembly 30 has an axially penetrating balance channel 31 inside. The valve has a valve port flow channel 41. The valve core assembly 30 is disposed on the valve and is used to regulate the flow rate of the valve port flow channel 41. The filter screen 20 is disposed at one end of the valve core assembly 30 near the valve port flow channel 41 and is located at the opening of the balance channel 31. The filter screen 20 is used to filter the flowing medium entering the balance channel 31. The filter screen 20 protrudes towards the valve port flow channel 41. At the moment when the valve core assembly 30 opens the valve port flow channel 41, the flowing medium flowing through the valve port flow channel 41 flows over the surface of the filter screen 20.

[0029] This application, by setting the filter screen 20 to protrude towards the valve port flow channel 41, allows the flowing medium passing through the valve port flow channel 41 to flow over the surface of the filter screen 20 at the instant the valve core assembly 30 opens the valve port flow channel 41. This effectively utilizes the pressure difference at the moment of valve opening, allowing the large pressure difference to drive the flowing medium to quickly flush the filter screen 20, thus cleaning up impurities accumulated on the surface of the filter screen 20 and effectively preventing impurities from clogging it, enabling the filter screen 20 to work stably for a long time. Furthermore, by setting the filter screen 20, it can also effectively filter the flowing medium entering the balance channel 31, preventing impurities from entering the balance channel 31, thereby ensuring the reliable operation of the valve. This application, by setting the balance channel... The uniqueness of the inlet and outlet of the balancing channel 31 ensures that all flowing media entering the balancing channel 31 must pass through the filter screen 20. Regardless of the flow direction of the medium, this effectively prevents impurities from entering the valve's precisely fitted structure, thus avoiding the adverse effects of impurities on the structure and ensuring long-term stable operation of the valve, effectively improving its anti-impurity performance. The valve structure proposed in this application only requires one filter screen 20 on the balancing channel 31, which is not only simple and low-cost, but also facilitates assembly and subsequent maintenance. It also allows for standardized production of the filter screen 20. Compared to the existing technology that requires welding two filters at the inlet and outlet of the electronic expansion valve, this application eliminates multiple welding processes, reducing the risk of welding leaks. Furthermore, the filter screen 20 does not need to change with the size of the valve's inlet and outlet, achieving standardized production, which is more conducive to subsequent quality control and cost reduction, making it suitable for large-scale promotion and use.

[0030] In addition, the opening of the balance channel 31 in this application is located at one end of the balance channel 31 facing the valve port flow channel 41.

[0031] It should be noted that, compared with existing valve structures with filters, this application, through its structural design, effectively utilizes the pressure difference at the moment the valve core assembly 30 opens the valve port flow channel 41. This allows the flowing medium to quickly flush the surface of the filter screen 20 and the space between the filter screen and its surrounding structures (such as the mounting base 10 for installing the filter screen, the valve head 34, etc.), resulting in a better cleaning effect. In contrast, existing valve structures with filters typically filter the flowing medium only after the pressure has been balanced, failing to utilize the pressure difference at the moment of valve opening. Therefore, the cleaning effect of the flowing medium on the filter screen is poor, and the good cleaning effect of this application cannot be achieved.

[0032] As shown in Figures 1 and 2, the filter assembly also includes a mounting base 10, which has a flow channel 11 inside, and the flow channel 11 is connected to the balance channel 31; the filter screen 20 is fixedly installed on the mounting base 10 to filter impurities in the flow medium entering the flow channel 11.

[0033] It is worth noting that: regarding the accumulation location of impurities filtered by the filter screen 20, when the mounting base 10 is present, the main impurity accumulation location is between the mounting base 10 and the filter screen 20; when the mounting base 10 is not present, the impurities accumulate in the space between the filter screen 20 and structures such as the valve head 34.

[0034] When the valve core assembly 30 closes the valve port flow channel 41, at least a portion of the protrusion of the filter screen 20 toward the valve port flow channel 41 is located inside the valve port flow channel 41.

[0035] As shown in Figures 1 and 2, the outer surface of the protruding portion of the filter screen 20 facing the valve port flow channel 41 has an arc-shaped surface; and / or, the shape of the protruding portion of the filter screen 20 facing the valve port flow channel 41 is one of spherical, frustum-shaped, or cylindrical.

[0036] Through the above settings, the following advantages have been observed in practical use: 1. Optimized fluid dynamics of the flowing medium through the filter screen 20. The arc-shaped surface helps reduce turbulence and eddies during the flow process, thereby reducing fluid resistance and improving the efficiency of fluid passing through the filter screen 20; 2. Reduced accumulation of dirt on the filter screen 20. The arc-shaped surface may help reduce the accumulation of dirt and particles on the filter screen 20. The arc-shaped surface is less likely to form dead corners, making it easier for the fluid to flush impurities on the filter screen 20; 3. Enhanced durability. The arc-shaped surface of the protruding part of the filter screen 20 can increase the overall strength and rigidity of the filter screen 20, making it more resistant to the impact of high-pressure flowing media, thereby extending its service life; 4. Spherical, frustum-shaped, and cylindrical filter screens 20 are easier to clean and maintain; 5. Reduced pressure loss. It helps reduce the pressure loss when the flowing medium passes through the filter screen 20, which is especially important for valves with large flow rates; 6. Reduced flow noise. The arc-shaped surface helps reduce the noise generated when the flowing medium flows.

[0037] Specifically, the mounting base 10 can be fixed to the inner wall of the balance channel 31 by at least one of riveting, welding or interference fit connection, and is located at one end of the balance channel 31 near the valve port flow channel 41.

[0038] This configuration allows for reliable installation of the mounting base 10 at one end of the balance channel 31 near the valve port flow channel 41 using a simple machining method.

[0039] Optionally, the mesh size of filter 20 is not less than 100 mesh.

[0040] Setting the mesh count of filter screen 20 to be no less than 100 mesh means that the aperture of the sieve holes on filter screen 20 is no larger than 100 mesh sieve holes (the diameter of 100 mesh sieve holes is usually 150 micrometers). This setting takes into account that in actual use, valve (such as electronic expansion valve) manufacturers usually require the whole machine manufacturer to weld 100 mesh or higher filters on both sides of the valve. On the one hand, by adding 100 mesh or higher filter screen 20 here, the whole machine manufacturer can save the need for redundant filters before and after the valve, achieving the effect of cost reduction and efficiency improvement; on the other hand, when the whole machine manufacturer has already set 100 mesh filters before and after the valve, it forms a double insurance (i.e., redundant safety design) with the filter screen 20 structure in this application.

[0041] It should be noted that, in one specific embodiment of this application, the mesh count of the filter screen 20 is an important parameter indicating the size of the pores. It represents the number of sieve holes per inch (2.54 cm) of length. The higher the mesh count, the smaller the pore size and the better the filtration effect. The selection of the mesh count of the filter screen 20 needs to be determined based on the actual filtration requirements and the particle size of the filtered material. The following are some mesh counts of the filter screen 20 used in actual applications and their application ranges: 1. 150 mesh: This mesh count of the filter screen 20 is suitable for general filtration, used to filter fine particulate impurities in the flowing medium; 2. 200 mesh or 400 mesh: This mesh count of the filter screen 20 is suitable for fine filtration, and can filter tiny particulate impurities in the flowing medium. However, it should be noted that the higher the mesh count of the filter screen 20, the better the filtration effect, but the filtration speed will decrease accordingly, and the service life of the filter screen 20 will be shortened. Therefore, when selecting the mesh count of the filter screen 20, factors such as filtration effect, filtration speed, and cost should be comprehensively considered to achieve the best filtration effect.

[0042] As shown in Figures 1 and 2, this application also provides an electronic expansion valve, which includes the valve structure described above. The valve includes a valve body assembly 40, which has a valve port flow channel 41 and a first flow port 42 communicating with the valve port flow channel 41. A valve core assembly 30 is movably disposed on the valve body assembly 40 to control the opening and closing of the valve port flow channel 41 and the first flow port 42. A balance channel 31 is connected to the valve port flow channel 41 for balancing pressure.

[0043] Specifically, the balance channel 31 in the electronic expansion valve has a limiting step 32, which abuts against the filter assembly to axially limit the filter assembly; wherein, the filter assembly is fixed on the inner wall of the balance channel 31 near the valve port flow channel 41.

[0044] As shown in Figures 1 and 2, the filter assembly also includes a mounting base 10, which has a flow channel 11 inside, and the flow channel 11 is connected to the balance channel 31. The filter screen 20 is fixedly installed on the mounting base 10 to filter impurities in the flow medium entering the flow channel 11. The limiting step 32 abuts against the mounting base 10 to axially limit the mounting base 10. The mounting base 10 is fixed on the inner wall of the balance channel 31 near the valve port flow channel 41.

[0045] By setting the limiting step 32, the mounting seat 10 is reliably limited in the axial direction with a simple structure. Through the above structural design, the working reliability of the electronic expansion valve is guaranteed, and the structure of the electronic expansion valve is simplified. This allows the present application to be applied to existing electronic expansion valves. The improvement can be completed by adding the mounting seat 10 and filter screen 20 and other structures.

[0046] As shown in Figures 1 and 2, the electronic expansion valve also includes a first flow pipe 50 and a second flow pipe 60. The first flow pipe 50 is disposed on the valve body assembly 40 and communicates with the first flow port 42; the second flow pipe 60 is disposed on the valve body assembly 40 and communicates with the valve port flow channel 41. There is a pressure difference between the first flow port 42 and the valve port flow channel 41. At the moment when the valve core assembly 30 opens the valve port flow channel 41, the flowing medium passes through the valve port flow channel 41 and washes the surface of the filter screen 20 to remove impurities on the filter screen 20.

[0047] In one specific embodiment of this application, the electronic expansion valve is a bidirectional flow valve, as shown in Figure 1. When the fluid flows from the first flow pipe 50 to the second flow pipe 60 (i.e., horizontal pipe in and vertical pipe out in Figure 1), the first flow port 42 is under high pressure, and the valve port flow channel 41 is under low pressure. The pressure difference drives the flow medium to flush the specific location of impurity accumulation on the surface of the filter screen 20.

[0048] With this configuration, when the electronic expansion valve is opened, the circulating medium flows through the valve port channel 41 and onto the surface of the filter screen 20 under the action of pressure difference, thereby flushing and cleaning the impurities accumulated on the surface of the filter screen 20. This effectively prevents impurities from clogging the filter screen 20, allowing the filter screen 20 to work stably for a long time.

[0049] Specifically, the filter assembly is fixed to the inner wall of the balance channel 31 near the valve port flow channel 41 by riveting, and a first limiting part 33 is formed on the balance channel 31; wherein, there is a receiving space 21 between the protruding part of the filter 20 facing the valve port flow channel 41 and the first limiting part 33, and at the moment when the valve core assembly 30 opens the valve port flow channel 41, the circulating medium flows through the receiving space 21 to remove impurities in the receiving space 21.

[0050] As shown in Figure 2, the mounting base 10 is fixed to the inner wall of the balance channel 31 near the valve port flow channel 41 by riveting, and a first limiting part 33 is formed on the balance channel 31; the mounting base 10 and the filter screen 20 are fixedly connected by riveting, and a second limiting part 12 is formed on the mounting base 10; the first limiting part 33 and the second limiting part 12 abut against each other and are arranged in parallel; wherein, the protruding part of the filter screen 20 facing the valve port flow channel 41 has a receiving space 21 between the first limiting part 33 and / or the second limiting part 12, and at the moment when the valve core assembly 30 opens the valve port flow channel 41, the circulating medium flows through the receiving space 21 to remove impurities in the receiving space 21.

[0051] By setting the first limiting part 33 and the second limiting part 12 to abut and be arranged in parallel, the stability of the riveting is ensured, and the shape of the receiving space 21 is made more regular, which facilitates the smooth flow of the circulating medium in the receiving space 21. In actual use, it was found that impurities tend to accumulate in the receiving space 21. This application achieves efficient removal of impurities in the receiving space 21 through the above structural design.

[0052] It is worth noting that, as shown in Figure 2, the dimensions of the first limiting part 33 and the second limiting part 12 are matched, and it is ensured that the protruding section of the valve head 34 (i.e., the first limiting part 33 on the balance channel 31) overlaps the riveting slope of the second limiting part 12 after riveting. This setting is equivalent to forming a smooth flow channel here. When the electronic expansion valve is in the open state and at the moment of opening, the pressure difference will form a scouring force at this riveting slope, which can remove the impurities attached and deposited here and on the surface of the filter screen 20.

[0053] As shown in Figure 1, in a specific embodiment of this application, the circulating medium enters from the first circulating pipe 50 and exits from the second circulating pipe 60, that is, the fluid flow direction is horizontal pipe in and vertical pipe out as shown in Figure 1. At the moment the electronic expansion valve in Figure 1 is opened, the first circulating pipe 50 is a high-pressure area and the second circulating pipe 60 is a low-pressure area. The pressure difference between the two drives the circulating medium to quickly flush the space between any two of the filter screen 20, the mounting base 10, the second limiting part 12, the accommodating space 21, and the first limiting part 33. Since the most likely place for impurities to adhere is in the area between the mounting base 10 and the filter screen 20, the advantage of the design of the filter screen 20 protruding towards the valve port flow channel 41 is more obvious. Due to the protruding design, the impurities remaining in the bending area can be flushed away by the high-speed fluid, thereby avoiding the formation of dirt blockage. However, if the filter screen 20 protrudes away from the valve port flow channel 41, the bending area cannot be flushed, and the above effect will not be achieved.

[0054] Specifically, if the filtration area of ​​filter screen 20 is A and the area of ​​the minimum flow cross section in the balance channel 31 is B, then the ratio of A to B is not less than 1.2.

[0055] This design ensures that the filtration area of ​​the filter screen 20 is larger than the flow area of ​​the minimum balance channel within the entire valve, providing sufficient safety margin. This allows the balance within the balance channel 31 of the electronic expansion valve to be effectively maintained even if the filter screen 20 is partially blocked, thus guaranteeing the long-term stable operation of the electronic expansion valve.

[0056] In addition, by setting the ratio of A to B to be no less than 1.2, the height of the protruding part of the filter screen 20 (i.e., the axial protrusion length) is also limited when the dimensions of the valve port flow channel 41 and the balance channel 31 are limited; that is, the bottom area of ​​the filter screen 20 is basically determined by the inner wall size of the valve head 34, so if the filtration area of ​​the filter screen 20 is to be adjusted, the height needs to be adjusted in the design.

[0057] It should be noted that the mounting base 10 in this application is located on the inner peripheral wall of the valve head 34, rather than on the outer peripheral wall. The reason is that the outer peripheral wall of the valve head 34 mainly cooperates with the inner wall of the valve port flow channel 41 to perform the valve closing and sealing function. The outer peripheral wall and the valve port flow channel 41 are close in size. If the mounting base 10 is located on the outer peripheral wall, the gap between the outer edge of the filter screen 20 and the valve port flow channel 41 will be too small, which will reduce the actual filtration effect. Therefore, the mounting base 10 is fixedly located on the inner peripheral wall of the valve head 34, including but not limited to riveting, welding and other methods.

[0058] As shown in Figures 1 and 2, the valve core assembly 30 includes a valve head 34, a guide sleeve 35, a sealing ring 36, and a screw drive component 37. The guide sleeve 35 is fixedly mounted on the valve body assembly 40 and is in a sealing fit with the valve body assembly 40. The sealing ring 36 is sleeved between the valve head 34 and the guide sleeve 35, and is in a sealing fit with the outer wall of the valve head 34 and the inner wall of the guide sleeve 35, respectively. The valve head 34 is movably mounted inside the guide sleeve 35 and is used to open and close the valve port flow channel 41. A portion of the balance channel 31 is located inside the valve head 34. The screw drive component 37 and the valve head 34 form a portion of the balance channel 31. The screw drive component 37 is in a limiting fit with the valve head 34 and is used to drive the valve head 34 to move. The minimum flow cross section in the balance channel 31 is located between the screw drive component 37 and the valve head 34.

[0059] By configuring the valve core assembly 30 to include a valve head 34, a guide sleeve 35, a sealing ring 36, and a screw drive component 37, a reliable seal is achieved between the valve head 34 and the guide sleeve 35 using a sealing ring (e.g., an O-ring). The guide sleeve 35 can be welded to the valve body assembly 40 to form a single unit. Through the above sealing method, the guide sleeve 35 and the valve body assembly 40, as well as the valve head 34 and the guide sleeve 35, are reliably sealed. This ensures that the flowing medium carrying impurities can only enter the rotor cavity and precisely fitted positions of the electronic expansion valve, such as the threaded pair, through the balance channel 31. Combined with the reliable filtration of the filter screen 20, the entry of impurities is effectively prevented.

[0060] Additionally, it should be noted that, as shown in Figure 2, the screw drive component 37 includes a screw and an axial limiting component 38 connected to the lower end of the screw (i.e., the structure between the filter screen 20 and the screw in Figure 2). The axial limiting component 38 is used to axially limit the valve head 34, and the minimum flow section in the balance channel 31 is located at the gap between the axial limiting component 38 and the screw.

[0061] In one specific embodiment of this application, a portion of the balance channel 31 is formed between the screw drive component 37 and the valve head 34 as follows: 1. A portion of the screw in the screw drive component 37 is cut axially, and the resulting space forms a portion of the balance channel 31 between it and the inner wall of the valve head 34; 2. A portion of the balance channel 31 is formed inside the screw in the screw drive component 37 by drilling. The above methods can be flexibly selected according to actual usage requirements to ensure the smoothness of the balance channel 31.

[0062] In summary, this application provides a valve structure and an electronic expansion valve. By setting a filter screen 20 protruding towards the valve port flow channel 41, when the valve core assembly 30 opens the valve port flow channel 41, the flowing medium passing through the valve port flow channel 41 flows over the surface of the filter screen 20. This effectively utilizes the pressure difference at the moment of valve opening, allowing the large pressure difference to drive the flowing medium to quickly flush the filter screen 20, thus flushing and cleaning the impurities accumulated on the surface of the filter screen 20. This effectively prevents impurities from clogging the filter screen 20, allowing the filter screen 20 to work stably for a long time. By setting the filter screen 20, it is also possible to effectively filter the flowing medium entering the balance channel 31, preventing impurities from entering the balance channel 31, thereby ensuring the reliable operation of the valve. This application ensures that all flowing media entering the balance channel 31 are filtered by the filter screen 20 by setting the uniqueness of the inlet and outlet of the balance channel 31. Regardless of the flow direction of the medium, this effectively prevents impurities from entering the valve's precisely fitted structure, thus avoiding the adverse effects of impurities on the structure and ensuring long-term stable operation of the valve, effectively improving its anti-impurity performance. The valve structure proposed in this application only requires one filter screen 20 on the balance channel 31, which is not only simple and low-cost, but also facilitates assembly and subsequent maintenance. It also allows for standardized production of the filter screen 20. Compared to the existing technology that requires welding two filters at the inlet and outlet of the electronic expansion valve, this application eliminates multiple welding processes, reducing the risk of welding leaks. Furthermore, it does not require changes to the size of the valve's inlet and outlet, achieving standardized production, which is more conducive to subsequent quality control and cost reduction, making it suitable for large-scale promotion and use.

[0063] 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. A valve structure, characterized by, The valve structure includes a valve, a valve core assembly (30), and a filter assembly. The filter assembly includes a filter screen (20). The valve core assembly (30) has an axially penetrating balance channel (31) inside. The valve has a valve port flow channel (41). The valve core assembly (30) is disposed on the valve and is used to regulate the flow rate of the valve port flow channel (41). The filter screen (20) is disposed at one end of the valve core assembly (30) near the valve port flow channel (41) and is located at the opening of the balance channel (31). The filter screen (20) is used to filter the flowing medium entering the balance channel (31). The filter screen (20) protrudes towards the valve port flow channel (41). At the moment when the valve core assembly (30) opens the valve port flow channel (41), the flowing medium flowing through the valve port flow channel (41) flows over the surface of the filter screen (20).

2. The valve structure according to claim 1, characterized in that, The filter assembly also includes a mounting base (10), the mounting base (10) having a flow channel (11) inside, the flow channel (11) being connected to the balance channel (31); the filter (20) is fixedly mounted on the mounting base (10) to filter impurities in the flow medium entering the flow channel (11).

3. The valve structure according to claim 2, characterized in that, The mounting base (10) is fixed to the inner wall of the balance channel (31) by at least one of riveting, welding or interference fit connection, and is located at one end of the balance channel (31) near the valve port flow channel (41).

4. The valve structure according to claim 1, characterized in that, When the valve core assembly (30) closes the valve port passage (41), at least a portion of the protrusion of the filter screen (20) toward the valve port passage (41) is located within the valve port passage (41).

5. The valve structure according to claim 1, characterized in that, The outer surface of the protruding portion of the filter screen (20) facing the valve port flow channel (41) has an arc-shaped surface or a plane; and / or, the shape of the protruding portion of the filter screen (20) facing the valve port flow channel (41) is one of spherical, frustum-shaped, cylindrical, or square; and / or, the mesh count of the filter screen (20) is not less than 100 meshes.

6. An electronic expansion valve, characterized in that, The electronic expansion valve includes the valve structure according to any one of claims 1 to 5; the valve includes a valve body assembly (40), the valve body assembly (40) having the valve port flow channel (41) and a first flow port (42) communicating with the valve port flow channel (41) inside, the valve core assembly (30) being movably disposed on the valve body assembly (40) to control the opening and closing of the valve port flow channel (41) and the first flow port (42); the balance channel (31) communicating with the valve port flow channel (41) is used to balance pressure.

7. The electronic expansion valve according to claim 6, characterized in that, The electronic expansion valve has a limiting step (32) in the balance channel (31), which abuts against the filter assembly to axially limit the filter assembly; wherein the filter assembly is fixed on the inner wall of the balance channel (31) near the valve port flow channel (41).

8. The electronic expansion valve according to claim 7, characterized in that, The filter assembly also includes a mounting base (10), the mounting base (10) having a flow channel (11) inside, the flow channel (11) communicating with the balance channel (31); the filter screen (20) is fixedly mounted on the mounting base (10) to filter impurities in the flow medium entering the flow channel (11); wherein, the limiting step (32) abuts against the mounting base (10) to axially limit the mounting base (10); the mounting base (10) is fixed on the inner wall of the balance channel (31) near the valve port flow channel (41).

9. The electronic expansion valve according to claim 6, characterized in that, The electronic expansion valve further includes a first flow pipe (50) and a second flow pipe (60). The first flow pipe (50) is disposed on the valve body assembly (40) and communicates with the first flow port (42). The second flow pipe (60) is disposed on the valve body assembly (40) and communicates with the valve port flow channel (41). There is a pressure difference between the first flow port (42) and the valve port flow channel (41). At the moment when the valve core assembly (30) opens the valve port flow channel (41), the flowing medium passes through the valve port flow channel (41) and washes the surface of the filter screen (20) to remove impurities on the filter screen (20).

10. The electronic expansion valve according to claim 6, characterized in that, The filter assembly is fixed to the inner wall of the balance channel (31) near the valve port flow channel (41) by riveting, and a first limiting part (33) is formed on the balance channel (31); wherein, the protruding part of the filter (20) facing the valve port flow channel (41) has a receiving space (21) between it and the first limiting part (33). At the moment when the valve core assembly (30) opens the valve port flow channel (41), the circulating medium flows through the receiving space (21) to remove impurities in the receiving space (21).

11. The electronic expansion valve according to claim 10, characterized in that, The filter assembly further includes a mounting base (10), which is fixed to the inner wall of the balance channel (31) near the valve port flow channel (41) by riveting, and a first limiting part (33) is formed on the balance channel (31); the mounting base (10) is fixedly connected to the filter screen (20) by riveting, and a second limiting part (12) is formed on the mounting base (10); the first limiting part (33) and the second limiting part (12) abut against each other and are arranged in parallel; wherein, the protruding part of the filter screen (20) facing the valve port flow channel (41) forms the receiving space (21) between the first limiting part (33) and / or the second limiting part (12).

12. The electronic expansion valve according to claim 6, characterized in that, The filter area of ​​the filter screen (20) is A, and the area of ​​the minimum flow cross section in the balance channel (31) is B. Then the ratio of A to B is not less than 1.

2.

13. The electronic expansion valve according to claim 12, characterized in that, The valve core assembly (30) includes a valve head (34), a guide sleeve (35), a sealing ring (36), and a screw drive component (37). The guide sleeve (35) is fixedly mounted on the valve body assembly (40) and seals against the valve body assembly (40). The sealing ring (36) is sleeved on the outside of the valve head (34) and seals against the inner wall of the guide sleeve (35). The valve head (34) is movably mounted inside the guide sleeve (35) and limits its position against the inner wall of the guide sleeve (35). (34) is used to open and close the valve port flow channel (41); a part of the balance channel (31) is located inside the valve head (34); a part of the balance channel (31) is formed between the screw drive (37) and the valve head (34), the screw drive (37) is threadedly engaged with the valve head (34), and the screw drive (37) is used to drive the valve head (34) to move; wherein, the minimum flow section in the balance channel (31) is located between the screw drive (37) and the valve head (34).

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