Valve structure and electronic expansion valve

Abstract

The utility model 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, an axial through balance channel is arranged in the valve core assembly, the valve is provided with a valve port flow channel, and the valve core assembly is arranged on the valve and used for adjusting the flow of the valve port flow channel; the filter screen is arranged at the end, close to the valve port flow channel, of the valve element assembly and located at an opening of the balance channel. The filter screen is used for filtering a circulating medium entering the balance channel; the filter screen protrudes towards the valve port flow channel; and at the moment that the valve port flow channel is opened by the valve element assembly, a circulating medium flowing through the valve port flow channel flows through the surface of the filter screen. According to the utility model, the pressure difference at the moment of opening the valve is effectively utilized, so that the larger pressure difference at the moment of opening the valve drives a circulating medium to quickly wash the filter screen, and impurities accumulated on the surface of the filter screen are washed and cleaned, so that the filter screen is effectively prevented from being blocked by the impurities, and the filter screen can stably work for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve technical field, specifically, relate to a valve structure and electronic expansion valve. BACKGROUND

[0002] As an important throttling element in heat exchange field, the action reliability of the electronic expansion valve is the most important in the whole machine operation effect guarantee link; because the cooperation between the internal parts (especially the transmission parts and threaded pairs in the valve head) is very precise, when the impurities with large particle size enter the electronic expansion valve through the circulation of refrigerant (i.e. flow medium), it is extremely easy to cause the working abnormality of the whole electronic expansion valve (including but not limited to the poor action of on-off valve and other problems).

[0003] Under the condition that the whole machine pipeline environment of the current electronic expansion valve is more and more complex, the welding points between the pipeline and each component are more and more, combined with the uneven welding control level and cleanliness control level of different whole machine manufacturers, the oxidation scale generated during welding or the impurities existing in each component due to poor cleanliness enter the refrigerant circulation system from time to time, and various impurities eventually enter the internal electronic expansion valve with precise cooperation along with the circulation of refrigerant, which is extremely easy to cause the working abnormality of the electronic expansion valve, so higher requirements are put forward for the anti-impurity performance of the electronic expansion valve.

[0004] The existing electronic expansion valve usually sets a filter structure (such as a filter screen) in the valve to filter impurities, and the impurities filtered by the filter structure will accumulate on the filter structure, so that the existing electronic expansion valve (especially the internal balance valve) will have the problem of impurity accumulation in the long-term working process, for example, the impurities filtered by the filter screen will accumulate on the surface of the filter screen and in the space between the filter screen and the structure near it (such as the bracket for installing the filter screen, the valve head and other structures), so that the impurities accumulated on the surface of the filter screen cannot be effectively cleaned, and the long-term stable work of the filter screen cannot be guaranteed, thereby affecting the reliable work of the electronic expansion valve. UTILITY MODEL CONTENTS

[0005] The utility model provides a valve structure and electronic expansion valve to solve the problem that the electronic expansion valve in the prior art cannot effectively clean the impurities on the filter structure, cannot guarantee the long-term stable work of the filter screen, and further affects the reliable work of the electronic expansion valve.

[0006] To solve the above problems, according to one aspect of the present application, a valve structure is provided, which comprises a valve, a valve core assembly and a filter screen assembly, the filter screen assembly comprises a filter screen, the valve core assembly has an axial through balance channel inside, the valve has a valve port flow channel, the valve core assembly is arranged on the valve and used for adjusting the flow of the valve port flow channel; the filter screen is arranged at one end of the valve core assembly close to the valve port flow channel and located at the opening of the balance channel; the filter screen is used for filtering the flow medium entering the balance channel; wherein, the filter screen protrudes towards the valve port flow channel; at the moment when the valve core assembly opens the valve port flow channel, the flow medium flowing through the valve port flow channel flows through the surface of the filter screen.

[0007] Further, the filter screen assembly further comprises a mounting seat, the mounting seat has a flow channel inside, the flow channel is communicated with the balance channel; the filter screen is fixedly installed on the mounting seat to filter the impurities of the flow medium entering the flow channel.

[0008] Further, the mounting seat is fixed on the inner wall of the balance channel by at least one of riveting, welding or interference fit connection and located at one end of the balance channel close to the valve port flow channel.

[0009] Further, at least a part of the protruding part of the filter screen towards the valve port flow channel is located in the valve port flow channel when the valve core assembly closes the valve port flow channel.

[0010] Further, the outer surface of the protruding part of the filter screen towards the valve port flow channel has an arc surface or a plane; and / or, the shape of the protruding part of the filter screen towards the valve port flow channel is one of spherical, circular truncated cone, cylindrical or square; and / or, the mesh number of the filter screen is not less than 100 meshes.

[0011] According to another aspect of the present application, an electronic expansion valve is provided, which comprises the above valve structure; the valve comprises a valve body assembly, the valve body assembly has a valve port flow channel and a first flow port communicated with the valve port flow channel inside, the valve core assembly is movably arranged on the valve body assembly to control the on-off of the valve port flow channel and the first flow port; the balance channel is communicated with the valve port flow channel and used for balancing pressure.

[0012] Further, the balance channel in the electronic expansion valve has a limiting step inside, the limiting step abuts against the filter screen assembly to axially limit the filter screen assembly; wherein, the filter screen assembly is fixed on the inner wall of one end of the balance channel close to the valve port flow channel.

[0013] Further, the filter screen assembly further comprises a mounting seat, the mounting seat has a flow channel inside, the flow channel is communicated with the balance channel; the filter screen is fixedly installed on the mounting seat to filter the impurities of the flow medium entering the flow channel; wherein, the limiting step abuts against the mounting seat to axially limit the mounting seat; the mounting seat (10 is fixed on the inner wall of one end of the balance channel close to the valve port flow channel.

[0014] Further, the electronic expansion valve further comprises a first flow pipe and a second flow pipe, the first flow pipe is arranged on the valve body assembly and communicates with the first flow port; the second flow pipe is arranged on the valve body assembly and communicates with the valve port flow channel; wherein, the first flow port and the valve port flow channel have a pressure difference, at the moment when the valve core assembly opens the valve port flow channel, the flow medium flows through the valve port flow channel and flushes the surface of the filter screen to remove impurities on the filter screen.

[0015] Further, the filter screen assembly is fixed on the inner wall of the balance channel near the one end of the valve port flow channel by riveting, and forms a first limiting part on the balance channel; wherein, the protruding part of the filter screen towards the valve port flow channel and the first limiting part have an accommodation space, at the moment when the valve core assembly opens the valve port flow channel, the flow medium flows through the accommodation space to remove impurities in the accommodation space.

[0016] Further, the filter screen assembly further comprises a mounting seat, the mounting seat is fixed on the inner wall of the balance channel near the one end of the valve port flow channel by riveting, and forms a first limiting part on the balance channel; the mounting seat and the filter screen are fixedly connected by riveting, and a second limiting part is formed on the mounting seat; the first limiting part and the second limiting part are arranged in abutment and parallel; wherein, the protruding part of the filter screen towards the valve port flow channel and the first limiting part and / or the second limiting part form an accommodation space.

[0017] Further, the filtering area of the filter screen is A, and the area of the smallest flow cross section in the balance channel is B, the ratio of A to B is not less than 1.2.

[0018] Further, the valve core assembly comprises a valve head, a guide sleeve, a sealing ring and a screw transmission part, the guide sleeve is fixedly arranged on the valve body assembly and sealingly cooperates with the valve body assembly; the sealing ring is sleeved on the outside of the valve head and sealingly cooperates with the inner wall of the guide sleeve; the valve head is movably arranged in the guide sleeve and limitingly cooperates with the inner wall of the guide sleeve, and the valve head is used for opening and closing the valve port flow channel; a part of the balance channel is located in the valve head; a part of the balance channel is formed between the screw transmission part and the valve head, the screw transmission part is in threaded cooperation with the valve head, and the screw transmission part is used for driving the valve head to move; wherein, the smallest flow cross section in the balance channel is located between the screw transmission part and the valve head.

[0019] The utility model discloses a technical scheme, the utility model provides a valve structure, and the valve structure includes valve, valve core subassembly and filter screen subassembly, and the filter screen subassembly includes filter screen, and the valve core subassembly has the balance passage of axial through in the inside, and the valve has the valve port flow channel, and the valve core subassembly sets up on the valve, is used for adjusting the flow of valve port flow channel, and the filter screen sets up in the one end of valve core subassembly close to valve port flow channel, and is located the opening of balance passage, and the filter screen is used for filtering the flow medium of entering balance passage, and wherein, the filter screen protrudes to the valve port flow channel, and in the instant of valve core subassembly opening valve port flow channel, the flow medium of flowing through valve port flow channel flows through the surface of filter screen.

[0020] The utility model discloses a technical scheme, the utility model provides a valve structure, and the valve structure includes valve, valve core subassembly and filter screen subassembly, and the filter screen subassembly includes filter screen, and the valve core subassembly has the balance passage of axial through in the inside, and the valve has the valve port flow channel, and the valve core subassembly sets up on the valve, is used for adjusting the flow of valve port flow channel, and the filter screen sets up in the one end of valve core subassembly close to valve port flow channel, and is located the opening of balance passage, and the filter screen is used for filtering the flow medium of entering balance passage, and wherein, the filter screen protrudes to the valve port flow channel, and in the instant of valve core subassembly opening valve port flow channel, the flow medium of flowing through valve port flow channel flows through the surface of filter screen, and the pressure difference of opening valve instant is effectively utilized, and the greater pressure difference of opening valve instant drives the flow medium to wash filter screen quickly, realizes the washing cleaning of impurity accumulated on the surface of filter screen, and then effectively avoids the impurity and blocks filter screen, so that filter screen can work stably for a long time, the flow medium in balance passage can be effectively filtered through the setting filter screen, so that the impurity cannot enter balance passage, and then reliable work of valve is ensured, the utility model discloses can be through the setting balance passage import and export uniqueness, ensure that the flow medium of entering balance passage all need to pass through filter screen filtering, under the condition that the flow medium is no matter any flow direction, can effectively prevent the impurity from entering the cooperation precision structure inside, and then avoid the adverse effect of impurity to cooperation precision structure, ensure the long -term stable work of valve, effectively improve the anti-impurity performance of valve, the valve structure of the utility model discloses is only needed to set up a filter screen on balance passage, is simple and low in cost, is convenient for assembling and subsequent maintenance, and the standardization production of filter screen parts can also be realized, compared with the mode that two filters are respectively welded at the inlet and outlet pipe of electronic expansion valve in the prior art, the utility model discloses does not need multiple welding procedures, reduces the risk of welding leakage, at the same time, the filter screen also does not need to change with the size change of the inlet and outlet pipe of valve, realizes the standardization production, is more favorable to subsequent quality control and cost reduction and efficiency increase, and is suitable for large-scale popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the application, and together with the description of the application, serve to explain the application. In the drawings:

[0022] Figure 1 A part structure schematic view of the electronic expansion valve provided by the embodiment of the utility model is shown;

[0023] Figure 2The embodiment of the utility model discloses an electronic expansion valve in the position of filter screen.

[0024] Among them, the above-mentioned drawing includes the following figure marks:

[0025] 10, mounting seat, 11, flow passage, 12, second limiting part,

[0026] 20, filter screen, 21, containing space,

[0027] 30, valve core assembly, 31, balance passage, 32, limiting step, 33, first limiting part, 34, valve head, 35, guide sleeve, 36, sealing ring, 37, screw driving part, 38, axial limiting piece,

[0028] 40, valve body assembly, 41, valve port flow channel, 42, first flow port,

[0029] 50, first flow pipe,

[0030] 60, second flow pipe. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0032] As Figures 1 to 2 The embodiment of the utility model provides a valve structure, and the valve structure includes a valve, a valve core assembly 30 and a filter screen assembly, the filter screen assembly includes a filter screen 20, the valve core assembly 30 has a balance passage 31 through in the axial direction, the valve has a valve port flow channel 41, the valve core assembly 30 is arranged on the valve and is used to adjust the flow of the valve port flow channel 41, the filter screen 20 is arranged at one end of the valve core assembly 30 close to the valve port flow channel 41 and is located at the opening of the balance passage 31, the filter screen 20 is used to filter the flow medium entering the balance passage 31, wherein 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 flow medium flowing through the valve port flow channel 41 flows through the surface of the filter screen 20.

[0033] The utility model discloses a filter screen 20 is set to the valve port flow channel 41 of valve's direction protrude, makes the flow medium that flows through the valve port flow channel 41 flow through the surface of filter screen 20 in the moment of valve core assembly 30 opening valve port flow channel 41, and then effectively utilizes the pressure difference of valve opening moment, makes the greater pressure difference of valve opening moment drive flow medium to flush filter screen 20 quickly, realizes the flush cleaning of the impurity that the surface of filter screen 20 accumulated, and then effectively avoids the impurity block filter screen 20, makes filter screen 20 can long-term stable work, through setting filter screen 20, also makes filter screen 20 can effectively filter the flow medium that enters balance passage 31, makes the impurity unable to enter balance passage 31, and then guarantees the reliable work of valve, the utility model discloses can pass through the unicity of balance passage 31 import and export, guarantees the flow medium that enters balance passage 31 all need to pass through filter screen 20 filtering, under the condition that flow medium is whatever flow direction, can effectively block the impurity to enter the cooperation precision structure inside, and then avoids the adverse effect of impurity to cooperation precision structure, guarantees the long-term stable work of valve, effectively improves the anti-impurity performance of valve, the valve structure that the utility model discloses only needs to set filter screen 20 at balance passage 31, is not only simple and low in cost, is convenient for assembling and subsequent maintenance, but also can realize the standardization production of filter screen 20 parts, compared with the mode that two filters are welded respectively at the inlet and outlet pipe of electronic expansion valve in prior art, the utility model does not need multiple welding procedures, reduces the risk of welding leakage, simultaneously, filter screen 20 also does not need to change along with the size change of valve's inlet and outlet pipe, realizes the standardization production, is more favorable to subsequent quality control and cost reduction and efficiency increase, is suitable for large-scale popularization and use.

[0034] In addition, the opening position of the balance passage 31 in the utility model is located at one end of the balance passage 31 facing the valve port flow channel 41.

[0035] It should be noted that: compared with the existing valve structure with filter screen, the utility model utilizes the pressure difference of valve opening moment through structural design, so that the flow medium can quickly flush the surface of filter screen 20 and the space between the filter screen and the nearby structure (such as the mounting seat 10 for mounting the filter screen, the valve head 34, etc.), and the cleaning effect is good; while the existing valve structure with filter screen usually filters the flow medium after the pressure is balanced, and does not utilize the pressure difference of valve opening moment, so the cleaning effect of the flow medium on the filter screen is poor, and the good cleaning effect in the utility model cannot be achieved.

[0036] As Figures 1 to 2As shown, the filter screen assembly further comprises a mounting seat 10, the inside of the mounting seat 10 has a flow passage 11, the flow passage 11 is communicated with the balance passage 31; the filter screen 20 is fixedly installed on the mounting seat 10 to filter the impurities of the flow medium entering the flow passage 11.

[0037] It is worth noting that: regarding the accumulation position of the impurities filtered by the filter screen 20, when the mounting seat 10 is provided, the main impurity accumulation position is between the mounting seat 10 and the filter screen 20; when the mounting seat 10 is not provided, the impurities are accumulated in the space between the filter screen 20 and the structure such as the valve head 34.

[0038] When the valve core assembly 30 closes the valve port flow channel 41, at least a part of the protruding part of the filter screen 20 towards the valve port flow channel 41 is located in the valve port flow channel 41.

[0039] As shown in Figure 1 and Figure 2 , the outer surface of the protruding part of the filter screen 20 towards the valve port flow channel 41 has an arc surface; and / or, the shape of the protruding part of the filter screen 20 towards the valve port flow channel 41 is one of spherical, circular truncated cone, and cylindrical.

[0040] Through the above arrangement, the following advantages are found in actual use: 1. The fluid dynamics performance of the flow medium flowing through the filter screen 20 is optimized, the arc surface helps to reduce the turbulence and vortex of the flow medium in the flow process, thereby reducing the fluid resistance and improving the efficiency of the fluid passing through the filter screen 20; 2. The accumulation of dirt on the filter screen 20 is reduced, the arc surface may help to reduce the accumulation of dirt and particles on the filter screen 20, the arc surface is not easy to form a dead angle, and the fluid is convenient for flushing the impurities on the filter screen 20; 3. The durability is enhanced, the arc surface of the protruding part of the filter screen 20 can increase the overall strength and rigidity of the filter screen 20, so that it can better resist the impact of high-pressure flow medium, thereby prolonging the service life; 4. The spherical, circular truncated cone, and cylindrical filter screen 20 is more easy to clean and maintain; 5. The pressure loss is reduced, which helps to reduce the pressure loss of the flow medium passing through the filter screen 20, which is particularly important for large-flow valves; 6. The flow noise is reduced, the arc surface helps to reduce the noise generated when the flow medium flows.

[0041] Specifically, the mounting seat 10 can be fixed on the inner wall of the balance passage 31 by at least one of riveting, welding or interference fit connection, and located on the end of the balance passage 31 close to the valve port flow channel 41.

[0042] In this way, the reliable installation of the mounting seat 10 on the end of the balance passage 31 close to the valve port flow channel 41 is realized by a simple processing method.

[0043] Optionally, the mesh count of the filter screen 20 is not less than 100 meshes.

[0044] The mesh number of the filter screen 20 is not less than 100 meshes, which means that the aperture of the screen hole on the filter screen 20 is not greater than 100 mesh (the diameter of the 100 mesh screen hole is usually 150 microns). This is considered in actual use. The manufacturer of the valve (such as an electronic expansion valve) usually requires the whole machine manufacturer to weld a filter with 100 meshes or more on both sides of the valve. On the one hand, the filter screen 20 with 100 meshes or more is added here, so that the whole machine manufacturer can save the extra filters before and after the valve, thereby achieving the effect of reducing cost and increasing efficiency. On the other hand, when the whole machine manufacturer has set a 100 mesh filter before and after the valve, the filter screen 20 structure in the utility model forms double insurance (i.e. redundant safety design).

[0045] It should be noted that in one embodiment of the present application, the mesh number of the filter screen 20 is an important parameter representing the size of the aperture of the filter screen 20, which represents the number of screen holes per inch (2.54 cm) in length. The higher the mesh number, the smaller the aperture, and the better the filtering effect. The mesh number of the filter screen 20 needs to be determined according to the actual filtering requirements and the particle size of the filtered material. The following are some mesh numbers and their application ranges selected by the filter screen 20 in actual use: 1. 150 mesh. The filter screen 20 with this mesh number is suitable for general filtering and is used to filter fine particulate impurities in the flowing medium. 2. 200 mesh or 400 mesh. The filter screen 20 with this mesh number is suitable for fine filtering and can filter fine particulate impurities in the flowing medium. However, it should be noted that the higher the mesh number of the filter screen 20, the better the filtering effect, but the filtering speed will be correspondingly reduced, and the service life of the filter screen 20 will be shortened. Therefore, when selecting the mesh number of the filter screen 20, factors such as filtering effect, filtering speed and cost should be considered to achieve the best filtering effect.

[0046] As shown in Figure 1 and Figure 2 The utility model also provides an electronic expansion valve, the electronic expansion valve includes above -mentioned valve structure, the valve includes valve body assembly 40, valve body assembly 40 inside has valve port flow channel 41 and with valve port flow channel 41 communication's first flow through mouth 42, valve core assembly 30 movably arranged on valve body assembly 40 to control valve port flow channel 41 with first flow through mouth 42's on-off, balance passage 31 with valve port flow channel 41 communication, for balance pressure.

[0047] Specifically, the balance passage 31 in the electronic expansion valve has a limiting step 32, the limiting step 32 abuts against the filter screen assembly to axially limit the filter screen assembly; wherein the filter screen assembly is fixed on the inner wall of the balance passage 31 at one end close to the valve port flow channel 41.

[0048] As shown in Figure 1 and Figure 2As shown, the filter screen assembly further comprises a mounting seat 10, the inside of the mounting seat 10 has a flow passage 11, the flow passage 11 communicates with the balance passage 31; the filter screen 20 is fixedly installed on the mounting seat 10 to filter impurities of the flow medium entering the flow passage 11; wherein the limiting step 32 abuts against the mounting seat 10 to axially limit the mounting seat 10; the mounting seat 10 is fixed on the inner wall of the balance passage 31 near one end of the valve port flow channel 41.

[0049] By setting the limiting step 32, the reliable axial limitation of the mounting seat 10 is ensured by a simple structure; through the above structural design, the working reliability of the electronic expansion valve is ensured, and the structure of the electronic expansion valve tends to be simplified, and thus the utility model can be applied to the existing electronic expansion valve, and the improvement can be completed after the additional installation of the mounting seat 10 and the filter screen 20 and the like structures.

[0050] As shown in Figure 1 and Figure 2 , the electronic expansion valve further comprises a first flow pipe 50 and a second flow pipe 60, the first flow pipe 50 is arranged on the valve body assembly 40 and communicates with the first flow port 42; the second flow pipe 60 is arranged on the valve body assembly 40 and communicates with the valve port flow channel 41; wherein 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 flow medium passes through the valve port flow channel 41 to flush the surface of the filter screen 20 to remove the impurities on the filter screen 20.

[0051] In one specific embodiment of the utility model, the electronic expansion valve is a bidirectional flow valve, as shown in Figure 1 , when the fluid flow direction is from the first flow pipe 50 to the second flow pipe 60 (i.e. Figure 1 , the medium flows from the middle horizontal pipe to the vertical pipe), the first flow port 42 is high pressure, the valve port flow channel 41 is low pressure, and the pressure difference drives the flow medium to flush the specific impurity accumulation position on the surface of the filter screen 20.

[0052] In this way, at the moment when the valve of the electronic expansion valve is opened, the flow medium flows through the surface of the filter screen 20 under the action of the pressure difference, the flushing and cleaning of the impurities accumulated on the surface of the filter screen 20 are realized, and thus the impurities are effectively prevented from blocking the filter screen 20, so that the filter screen 20 can work stably for a long time.

[0053] Specifically, the filter screen assembly is fixed on the inner wall of the balance passage 31 near one end of the valve port flow channel 41 by riveting, and a first limiting part 33 is formed on the balance passage 31; wherein the protruding part of the filter screen 20 towards the valve port flow channel 41 and the first limiting part 33 have an accommodation space 21, at the moment when the valve core assembly 30 opens the valve port flow channel 41, the flow medium flows through the accommodation space 21 to remove the impurities in the accommodation space 21.

[0054] As shown in Figure 2 , the mounting seat 10 is fixed on the inner wall of the balance channel 31 near one end of the valve port flow channel 41 by riveting, and a first limiting portion 33 is formed on the balance channel 31; the mounting seat 10 is fixedly connected with the filter screen 20 by riveting, and a second limiting portion 12 is formed on the mounting seat 10; the first limiting portion 33 and the second limiting portion 12 are arranged in abutment and parallel; wherein the protruding part of the filter screen 20 towards the valve port flow channel 41 has an accommodation space 21 between the first limiting portion 33 and / or the second limiting portion 12, and the flow medium flows through the accommodation space 21 at the moment when the valve core assembly 30 opens the valve port flow channel 41, so as to remove the impurities in the accommodation space 21.

[0055] By arranging the first limiting portion 33 and the second limiting portion 12 in abutment and parallel, the stability of riveting is ensured, and the shape of the accommodation space 21 is more regular, so that the flow medium can flow smoothly in the accommodation space 21; it is found in actual use that impurities are easy to accumulate in the accommodation space 21, and the above structure design realizes efficient removal of impurities in the accommodation space 21.

[0056] It is worth noting that: the state after riveting is as shown in Figure 2 , the overall size of the first limiting portion 33 and the second limiting portion 12 is matched, and the riveting after the valve head 34 is ensured to lap the riveting inclined surface position of the second limiting portion 12, which is equivalent to forming a smooth flow channel at this position, and this structure can remove the impurities deposited on this position and the surface of the filter screen 20 under the condition that the electronic expansion valve is in the open valve state and at the moment of opening the valve, a scouring force is formed at the riveting inclined surface position due to the pressure difference.

[0057] As shown in Figure 1 , in one specific embodiment of the present application, the flow medium flows in from the first flow pipe 50 and flows out from the second flow pipe 60, that is, the fluid flow direction is Figure 1 in the middle horizontal pipe and out of the vertical pipe, and Figure 1 , at the moment of opening the valve of the electronic expansion valve, the first flow pipe 50 is a high-pressure area, and the second flow pipe 60 is a low-pressure area, and the pressure difference between the two drives the flow medium to quickly scour the space between any two of the filter screen 20, the mounting seat 10, the second limiting portion 12, the accommodation space 21 and the first limiting portion 33; since the most likely position for impurities to adhere is the area between the mounting seat 10 and the filter screen 20, at this time, the advantage of the design that the filter screen 20 protrudes towards the valve port flow channel 41 is more obvious, because the protruding design makes the impurities remaining at the bending area can be scoured away by the high-speed fluid, thereby avoiding the formation of dirty blockage, and if the filter screen 20 protrudes away from the valve port flow channel 41, because the bending area cannot be scoured, the above effect is not achieved.

[0058] Specifically, the filtering area of the filter screen 20 is A, and the area of the minimum flow passage section in the balance passage 31 is B, and the ratio of A to B is not less than 1.2.

[0059] In this way, the filtering area of the filter screen 20 is greater than the flow passage area of the balance passage with the minimum size in the whole valve, and a sufficient safety margin is left, so that in the case of partial blockage of the filter screen 20, the balance in the balance passage 31 of the electronic expansion valve can still be effectively maintained, thereby ensuring long-term stable operation of the electronic expansion valve.

[0060] In addition, by setting the ratio of A to B to be not less than 1.2, the height (i.e. the axial protruding length) of the protruding part of the filter screen 20 is also limited in the case that the sizes of the valve port flow passage 41 and the balance passage 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 filtering area of the filter screen 20 needs to be adjusted, it needs to be designed by adjusting the height.

[0061] It should be noted that the mounting seat 10 in the utility model is arranged on the inner peripheral wall of the valve head 34, not 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 passage 41 to play a sealing role in closing the valve, and the size of the outer peripheral wall and the valve port flow passage 41 is close, so if the mounting seat 10 is arranged on the outer peripheral wall, the gap between the outer edge of the filter screen 20 and the valve port flow passage 41 will be too small, which will reduce the actual filtering effect, therefore the mounting seat 10 is fixedly arranged on the inner peripheral wall of the valve head 34, including but not limited to riveting, welding and the like.

[0062] As shown in Figure 1 and Figure 2 , the valve core assembly 30 includes a valve head 34, a guide sleeve 35, a sealing ring 36 and a screw drive 37, the guide sleeve 35 is fixedly arranged on the valve body assembly 40 and sealingly cooperates with the valve body assembly 40; the sealing ring 36 is sleeved between the valve head 34 and the guide sleeve 35 and sealingly cooperates with the outer wall of the valve head 34 and the inner wall of the guide sleeve 35; the valve head 34 is movably arranged in the guide sleeve 35 and is used for opening and closing the valve port flow passage 41; a part of the balance passage 31 is located in the valve head 34; the screw drive 37 and the valve head 34 form a part of the balance passage 31, the screw drive 37 is limitingly cooperated with the valve head 34 and is used for driving the valve head 34 to move; wherein the minimum flow passage section in the balance passage 31 is located between the screw drive 37 and the valve head 34.

[0063] By setting the valve core assembly 30 to include the valve head 34, the guide sleeve 35, the sealing ring 36 and the screw driving part 37, reliable sealing is achieved between the valve head 34 and the guide sleeve 35 by using a sealing ring (such as an O-ring), and the guide sleeve 35 can be connected to the valve body assembly 40 in an integrated manner by welding; through the above sealing manner, the guide sleeve 35 and the valve body assembly 40, and the valve head 34 and the guide sleeve 35 are all reliably closed, so that the flow medium carrying impurities can only enter the rotor cavity, the threaded pair and other precise positions of the electronic expansion valve through the balance channel 31, and then combined with the reliable filtration of the filter screen 20, the entry of impurities is effectively prevented.

[0064] In addition, it should be noted that, as shown in Figure 2 The screw driving part 37 includes a screw and an axial limiting part 38 connected to the lower end of the screw (i.e. Figure 2 The structure between the filter screen 20 and the screw), and the axial limiting part 38 is used for axially limiting the valve head 34. The smallest flow cross section in the balance channel 31 is located at the gap between the axial limiting part 38 and the screw.

[0065] In one embodiment of the present application, the screw driving part 37 and the valve head 34 form part of the balance channel 31 in the following manner: 1. The screw in the screw driving part 37 is cut in the axial direction to form a space, and the space and the inner wall of the valve head 34 form part of the balance channel 31; 2. The screw in the screw driving part 37 is drilled inside to form part of the balance channel 31; the above-mentioned manners can be flexibly selected according to actual use requirements to ensure the smoothness of the balance channel 31.

[0066] In summary, the utility model provides a valve structure and electronic expansion valve, the utility model discloses a filter screen 20 is protruding to the valve port flow channel 41 of valve towards, in the instant of opening valve port flow channel 41 of valve core subassembly 30, make the flow medium that flows through the valve port flow channel 41 flow through the surface of filter screen 20, and then effectively utilize the pressure difference of valve opening instant, make the greater pressure difference of valve opening instant drive flow medium to flush filter screen 20 quickly, realize the flush cleaning of the impurity that the surface of filter screen 20 accumulated, and then effectively avoid the impurity block filter screen 20, make filter screen 20 can long-term stable work, through setting filter screen 20, make filter screen 20 can effectively filter the flow medium that enters balance passage 31, make the impurity unable to enter balance passage 31, and then guarantee the reliable work of valve, the utility model can pass through the uniqueness of balance passage 31 import and export, guarantee the flow medium that enters balance passage 31 all need to filter through filter screen 20, under the condition of flow medium whatever any flow direction can effectively block the impurity to enter the cooperation precision structure inside, and then avoid the adverse effect of impurity to cooperation precision structure, guarantee the long-term stable work of valve, effectively improve the anti-impurity performance of valve, the valve structure proposed by the utility model only needs to set a filter screen 20 on balance passage 31, is not only simple and low in cost, is convenient for assembling and subsequent maintenance, can also realize the standardization production of filter screen 20 parts, compared with the mode that two filters need to be welded respectively at the inlet and outlet pipe of electronic expansion valve in prior art, the utility model does not need multiple welding procedures, reduces the risk of welding leakage, simultaneously, also need not change along with the size change of valve inlet and outlet pipe, realizes the standardization production, is more conducive to subsequent quality control and cost reduction and efficiency increase, is suitable for large-scale popularization and use.

[0067] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0069] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0070] manual PN287712DUNANRG For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0072] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A valve structure, characterized by, The valve structure comprises a valve, a valve core assembly (30) and a filter screen assembly, the filter screen assembly comprises a filter screen (20), the valve core assembly (30) has an axial through balance channel (31) inside, the valve has a valve port flow passage (41), the valve core assembly (30) is arranged on the valve and is used for adjusting the flow of the valve port flow passage (41); the filter screen (20) is arranged at one end of the valve core assembly (30) close to the valve port flow passage (41) and is located at the opening of the balance channel (31); the filter screen (20) is used for filtering the flow medium entering the balance channel (31); wherein the filter screen (20) protrudes towards the valve port flow passage (41); at the moment when the valve core assembly (30) opens the valve port flow passage (41), the flow medium flowing through the valve port flow passage (41) flows through the surface of the filter screen (20).

2. The valve structure of claim 1, wherein The filter screen assembly further comprises a mounting seat (10), the mounting seat (10) has a flow channel (11) inside, the flow channel (11) communicates with the balance channel (31); the filter screen (20) is fixedly installed on the mounting seat (10) to filter the impurities of the flow medium entering the flow channel (11).

3. The valve structure of claim 2, wherein The mounting seat (10) is fixed on the inner wall of the balance channel (31) at one end of the balance channel (31) close to the valve port flow passage (41) by at least one of riveting, welding or interference fit connection.

4. The valve structure of claim 1, wherein When the valve core assembly (30) closes the valve port flow passage (41), at least part of the protruding part of the filter screen (20) towards the valve port flow passage (41) is located in the valve port flow passage (41).

5. The valve structure of claim 1, wherein The outer surface of the protruding part of the filter screen (20) towards the valve port flow passage (41) has an arc surface or a plane; and / or, the shape of the protruding part of the filter screen (20) towards the valve port flow passage (41) is one of spherical, circular truncated cone, cylindrical or square; and / or, the mesh number of the filter screen (20) is not less than 100 meshes.

6. An electronic expansion valve characterized by The electronic expansion valve comprises the valve structure of any one of claims 1 to 5; the valve comprises a valve body assembly (40), the valve body assembly (40) has the valve port flow passage (41) and a first flow port (42) communicating with the valve port flow passage (41) inside, the valve core assembly (30) is movably arranged on the valve body assembly (40) and controls the on-off of the valve port flow passage (41) and the first flow port (42); the balance channel (31) communicates with the valve port flow passage (41) and is used for balancing pressure.

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

8. The electronic expansion valve according to claim 7, characterized in that The filter screen assembly further comprises a mounting seat (10), the mounting seat (10) has a flow passage (11) in the inside, the flow passage (11) communicates with the balance passage (31); the filter screen (20) is fixedly installed on the mounting seat (10) to filter the impurities of the flow medium entering the flow passage (11); wherein the limiting step (32) abuts against the mounting seat (10) to axially limit the mounting seat (10); the mounting seat (10) is fixed on the inner wall of the balance passage (31) near one end of the valve port flow channel (41).

9. The electronic expansion valve according to claim 6, wherein The electronic expansion valve further comprises a first flow pipe (50) and a second flow pipe (60), the first flow pipe (50) is arranged on the valve body assembly (40) and communicates with the first flow port (42); the second flow pipe (60) is arranged on the valve body assembly (40) and communicates with the valve port flow channel (41); wherein 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 flow medium passes through the valve port flow channel (41) to flush the surface of the filter screen (20) to remove the impurities on the filter screen (20).

10. The electronic expansion valve according to claim 6, wherein The filter screen assembly is fixed on the inner wall of the balance passage (31) near one end of the valve port flow channel (41) by riveting, and a first limiting portion (33) is formed on the balance passage (31); wherein the protruding part of the filter screen (20) towards the valve port flow channel (41) has an accommodation space (21) between the first limiting portion (33), at the moment when the valve core assembly (30) opens the valve port flow channel (41), the flow medium flows through the accommodation space (21) to remove the impurities in the accommodation space (21).

11. The electronic expansion valve according to claim 10, wherein The filter screen assembly further comprises a mounting seat (10), the mounting seat (10) is fixed on the inner wall of the balance passage (31) near one end of the valve port flow channel (41) by riveting, and the first limiting portion (33) is formed on the balance passage (31); the mounting seat (10) and the filter screen (20) are fixedly connected by riveting, and a second limiting portion (12) is formed on the mounting seat (10); the first limiting portion (33) and the second limiting portion (12) are arranged in abutment and parallel; wherein the protruding part of the filter screen (20) towards the valve port flow channel (41) forms the accommodation space (21) between the first limiting portion (33) and / or the second limiting portion (12).

12. The electronic expansion valve according to claim 6, wherein The filtering area of the filter screen (20) is A, and the area of the smallest flow cross section in the balance passage (31) is B, and the ratio of A to B is not less than 1.

2.

13. The electronic expansion valve according to claim 12, wherein The valve core assembly (30) comprises a valve head (34), a guide sleeve (35), a sealing ring (36) and a screw driving part (37), the guide sleeve (35) is fixedly arranged on the valve body assembly (40) and sealingly cooperates with the valve body assembly (40); the sealing ring (36) is sleeved on the outside of the valve head (34) and sealingly cooperates with the inner wall of the guide sleeve (35); the valve head (34) is movably arranged in the guide sleeve (35) and limitingly cooperates with the inner wall of the guide sleeve (35), the valve head (34) is used for opening and closing the valve port flow passage (41); a part of the balance channel (31) is located in the valve head (34); the screw driving part (37) and the valve head (34) form a part of the balance channel (31), the screw driving part (37) threadedly cooperates with the valve head (34), the screw driving part (37) is used for driving the valve head (34) to move; wherein the minimum flow cross section in the balance channel (31) is located between the screw driving part (37) and the valve head (34).

Images