A screen type stop valve

Abstract

The present application provides a screen type stop valve, which is a stop valve and can also be a stop check valve, can be used in pipelines of any temperature and any medium, and can achieve water-tight or air-tight effect, thereby providing guarantee for high-performance operation of the pipeline system; the screen type stop valve is light in weight, small in space occupation, easy to arrange, applicable to horizontal and vertical pipelines, and capable of bidirectional flow; the screen type stop valve is applicable to ships and land buildings, so that the pipeline can be arranged close to the top, and the floor height is increased; the valve core unit inside the screen type stop valve is convenient to disassemble, maintain and replace; the screen type stop valve is silent during operation, and does not affect work and life; when the screen material is aerogel, the screen type stop valve can adsorb harmful substances, clean water and gas, and meet the needs of clean cabins such as medical treatment and experiments; the screen type stop valve is convenient to operate and observe, and is intelligently and fully automatically operated, thereby improving work efficiency and saving labor cost; the screen type stop valve can be controlled and understood through a remote controller or a control touch screen, and the opening, closing, gear adjustment and running state of the screen type stop valve can be understood.

Description

Technical Field

[0001] This invention relates to the field of ship safety technology, and in particular to a screen-type shut-off valve. Background Technology

[0002] Currently, most marine gate valves and gate check valves occupy a large amount of space, which cannot meet the needs when the installation space is tight. For example, the GB / T587-2008 gate valve and GB / T588-2008 gate check valve have the disadvantages of being long and having large handwheels. In particular, the gate check valve requires the handwheel to be directly above the ceiling. If the pipeline is installed on the top of the cabin, not only is the handwheel impossible to operate, making it extremely inconvenient to use, but the pipeline height also has to be reduced due to the space occupied by the handwheel (it cannot be installed close to the ceiling), affecting the ceiling height.

[0003] The gate valve that occupies little space is currently the butterfly valve, such as GB / T3036-2017. However, its disadvantage is that if one of its two ends is connected to a reducer (large to small) or a pipe of the same diameter but with a smaller actual inner diameter, the valve plate inside the butterfly valve will encounter the suddenly smaller reducer or pipe when it is opened, making it impossible for the valve plate to be fully opened.

[0004] Small-sized shut-off check valves, such as plate-type check valves (e.g., CB / T3819-2013), have the following disadvantages: they sacrifice a significant amount of flow area; when the water flow in the pipeline is unstable, the internal metal valve disc opens and closes frequently due to gravity, generating considerable noise; they can only be installed horizontally, not vertically; and they can only be used in freshwater and seawater systems, not in high-temperature steam systems or ventilation systems.

[0005] Furthermore, both the aforementioned gate valves and check valves have specific requirements regarding the direction of media flow. If the valves are installed in the wrong direction, it could potentially cause a serious safety accident. A ship has numerous internal piping systems, resulting in an even greater number of valves. Therefore, it is essential to design gate valves and check valves that are space-saving, easy to install, convenient to operate, heat-resistant, and watertight and airtight. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a screen-type gate valve to solve the problems of large space occupation, many layout restrictions, and inconvenient operation of the gate valve in the prior art.

[0007] The screen-type gate valve of the present invention has the following beneficial effects: The screen-type gate valve is both a gate valve and can be combined with a flow sensor to become a gate check valve. It can be used in pipeline systems of any temperature and any medium, achieving watertight or airtight effects, thus ensuring the high-performance operation of the pipeline system. It is lightweight, occupies little space, and is easy to install. It is sandwiched between flanges of two sections of the system pipeline, and can be installed on both horizontal and vertical pipelines. It has no requirements on the direction of medium flow and allows bidirectional flow. It can be used in both marine and land-based construction, and can be used for both circular liquid pipelines and rectangular or square gas pipelines. The piping system can be installed close to the ceiling to increase floor height; the internal valve core unit is easy to disassemble and maintain; it operates silently, without affecting personnel's work and life; when using aerogel as an internal switch screen, it can effectively adsorb harmful substances and purify water and gas, making it suitable for water and air systems in cleanrooms such as medical and laboratory facilities; it is easy to operate and observe, achieving intelligent and fully automatic operation, improving work efficiency and reducing workload. No matter how far away it is from the operator, it can be easily controlled and monitored via remote control and the light or voice prompts on the control touchscreen to understand the opening, closing, gear adjustment, and operating status of the shut-off valve. Attached Figure Description

[0008] Figure 1 The diagram shows a screen valve fully open in a pipeline according to an embodiment of the present invention.

[0009] Figure 2 The diagram shows a screen shut-off valve completely closed in a pipeline according to an embodiment of the present invention.

[0010] Figure 3a The diagram shows a cross-sectional view of the circular screen shut-off valve when it is fully closed, as shown in an embodiment of the present invention.

[0011] Figure 3b Displayed as Figure 3a A top view of the structure along the AA direction.

[0012] Figure 3c Displayed as Figure 3b A magnified structural diagram of section C.

[0013] Figure 3d The diagram shows a cross-sectional view of the electromagnetic structure located on both sides of the guide rod in an embodiment of the present invention.

[0014] Figure 4 The diagram shown is a schematic diagram of the circular screen stop valve with two guide rods in an embodiment of the present invention.

[0015] Figure 5 The diagram shows a schematic of the structure of a circular screen stop valve guide rod fixed in the Y direction in an embodiment of the present invention.

[0016] Figures 6a-6b The diagram shows a fully open circular screen shut-off valve in an embodiment of the present invention.

[0017] Figures 7a-7b The diagram shown is a structural schematic of a square screen gate valve in an embodiment of the present invention.

[0018] Figure 8 The diagram shown is a schematic representation of the control system of the control unit in an embodiment of the present invention.

[0019] Component designation explanation

[0020] 110 Outer shell

[0021] 120 Fixed Hole Plate

[0022] 131 First Electromagnetic Structure

[0023] 132 Second Electromagnetic Structure

[0024] 140 Pipeline Sealing Structure

[0025] 210 guide rod

[0026] 220 Screen

[0027] 221 bullish candlestick

[0028] 222 Bearish candlestick

[0029] 231 S-pole magnet

[0030] 232 N-pole magnet

[0031] 240 Screen Sealing Structure

[0032] 300 Control Unit

[0033] 310 Control Touchscreen

[0034] 320 remote control

[0035] 330 power input line or upstream control line

[0036] 340 Upper-level status signal line

[0037] 400 Magnetic Sensor

[0038] 500 Flow Sensor

[0039] 600 piping

[0040] 610 Pipe Flange

[0041] 620 Fasteners Detailed Implementation

[0042] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0044] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the accompanying drawings for devices in use or operation.

[0045] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] like Figures 1-8 As shown, the present invention provides a screen-type shut-off valve, comprising at least:

[0047] The valve body unit includes a housing 110, a fixing structure, and an electromagnetic structure. The housing 110 is a hollow structure with openings at both ends. The fixing structure is circumferentially fixed to the side wall of the housing 110. Through the fixing structure, the two ends of the housing 110 are respectively fixedly connected to the pipeline 600. The electromagnetic structure is symmetrically fixed to the inner walls on opposite sides of the housing 110.

[0048] The valve core unit is located inside the housing 110 and includes a guide rod 210, a screen 220, and a magnet. Corresponding to the electromagnetic structure, the guide rod 210 is parallel to the center line of the housing and fixed to the inner wall of the housing 110. The screen 220 has an opening (not shown) in the middle, through which the guide rod 210 is movably connected to the housing 110. The magnet is fixed to the folded edges on both sides of the screen 220 and has opposite magnetic poles. Under the action of the magnetic force of the electromagnetic structure, the screen 220 is driven to unfold and fold along the guide rod 210. When unfolded, the screen 220 is completely in contact with the inner wall of the housing 110.

[0049] Control unit 300 is fixed to the side wall of housing 110 and electrically connected to valve body unit.

[0050] Specifically, such as Figures 1-2 The outer shell is a hollow structure with openings at both ends, and its two ends are connected to the pipes 600. Preferably, the outer diameter, wall thickness, and material of the outer shell are the same as those of the connected pipes 600, and it can be sandwiched between the two pipe flanges 610. A fixing structure is circumferentially fixed to the side wall of the outer shell 110 to secure the outer shell 110 to the pipes 600 at both ends. In one embodiment, the fixing structure is a fixing perforated plate 120, installed every 90° around the outer shell 110. When the outer shell 110 is sandwiched between the two pipe flanges 610, it is connected by fasteners 620 such as bolts, and the four fixing perforated plates 120 provide vertical and horizontal fixing. The above is a non-limiting example. Depending on actual needs, the fixing structure can also be bolts or other fixing structures. The number of fixing structures can be two, i.e., only located in the vertical or horizontal positions of the outer shell 110, or more than four, i.e., also located in other circumferential positions of the outer shell 110. No strict limitation is imposed here. Electromagnetic structures, such as electromagnetic coils, are symmetrically installed at two opposite locations on the inner wall of the outer casing 110, namely the first electromagnetic structure 131 and the second electromagnetic structure 132.

[0051] For ease of description, the extension direction of pipe 600 is defined as the Z direction, with the positive Z direction being rear and the negative Z direction being front. In the plane perpendicular to the extension direction of pipe 600, the two mutually perpendicular directions are the X direction and the Y direction, with the positive X direction being right, the negative X direction being left, the positive Y direction being up, and the negative Y direction being down. The above definitions are not intended to limit the present invention.

[0052] The valve core unit is located inside the housing 110 and includes a guide rod 210, a screen 220, and a magnet. For example... Figure 3a , Figures 4-6a , Figures 7a-7bThe guide rod 210 is parallel to the centerline of the outer shell and fixed to the inner wall of the outer shell 110. Its material is the same as the outer shell 110, both being metal materials compatible with the system piping 600. Its cross-section is small, having minimal impact on water flow. In this invention, "parallel to the centerline of the outer shell" includes "coinciding with the centerline of the outer shell." The screen 220 has an opening in the middle, through which the guide rod 210 passes, allowing it to unfold and fold within the outer shell 110. The screen 220 is made of elastic material, and its contact points with the guide rod 210 and the outer shell 110 have sealing properties. To facilitate the unfolding and folding of the screen 220, the guide rod 210 is arranged along the centerline of the outer shell closest to the electromagnetic structure. Magnets are installed at the folded edges on both sides of the screen 220 relative to the electromagnetic structure, allowing the screen 220 to move freely along the guide rod 210 under magnetic force. Figure 2 When the screen 220 is extended, it resembles a wave when viewed from above at the guide rod 210. Therefore, when the screen 220 is fully extended laterally, the inner screen 220 of the circular screen-type stop valve is actually elliptical, and the inner screen 220 of the square screen-type stop valve is actually rectangular. The size, shape, and length of the magnet match the folded edges on both sides of the screen and also fit into the two corresponding inner sides of the outer casing 110. The folded edges on both sides of the circular screen-type stop valve are arc-shaped, while the folded edges on both sides of the rectangular or square screen-type stop valve are vertical strips. An S-pole magnet 231 is installed on one folded edge of the screen 220, and an N-pole magnet 232 is installed on the other folded edge of the screen.

[0053] In detail, in this embodiment, as Figure 3b As shown, the guide rod 210 is fixed to the inner wall of the outer shell 110 along the center line of the outer shell in the X direction. The electromagnetic structure is located at points E and C in front of the guide rod 210, at both ends of the guide rod 210 in the X direction, and its height is symmetrical with respect to the guide rod 210 in the Y direction. The electromagnetic structure on the left is the first electromagnetic structure 131, and the corresponding magnet on the left is the S pole magnet 231. The electromagnetic structure on the right is the second electromagnetic structure 132, and the corresponding magnet on the right is the N pole magnet 232. The current applied to the first electromagnetic structure 131 generates a magnetic field that repels the S-pole magnet 231, pushing the left screen 220 towards the Y-direction centerline. Similarly, the current applied to the second electromagnetic structure 132 generates a magnetic field that repels the N-pole magnet 232, pushing the right screen 220 towards the Y-direction centerline. When both sides of the screen 220 move towards the Y-direction centerline, the opposite poles of the S-pole magnets 231 and N-pole magnets 232 on both sides attract each other, accelerating the movement. This causes the screen 220 to fold completely, thus fully opening the screen-type shut-off valve and allowing the internal medium to flow freely. Figure 1 .

[0054] When a reverse current is applied to the first electromagnetic structure 131, it generates a magnetic field that attracts the S-pole magnet 231, drawing the left-side screen 220 to the left inner wall of the outer casing 110. Similarly, a reverse current is applied to the second electromagnetic structure 132, generating a magnetic field that attracts the N-pole magnet 232, drawing the right-side screen 220 to the right inner wall of the outer casing 110. This fully unfolds the screen 220, completely closing the screen-type shut-off valve, ensuring a seamless seal between the screen 220 and the inner wall of the outer casing 110. The medium within the system pipeline 600 is thus completely blocked to one side. Figure 2 .

[0055] When the screen-type shut-off valve is fully open and needs to be adjusted, the first electromagnetic structure 131 applies a reverse current, causing it to generate a magnetic field that attracts the S-pole magnet 231. However, the current is less than the current when the screen-type shut-off valve is fully closed, attracting the left screen 220 towards the left inner wall of the outer casing 110. Similarly, the second electromagnetic structure 132 also applies a reverse current, causing it to generate a magnetic field that attracts the N-pole magnet 232. However, the current is less than the current when the screen-type shut-off valve is fully closed, attracting the right screen 220 towards the right inner wall of the outer casing 110. As the screen-type shut-off valve gradually reduces the amount of flowing medium, it is essentially a process of gradually increasing the reverse current applied by the first electromagnetic structure 131 and the second electromagnetic structure 132, until the screen-type shut-off valve is fully closed and the intensity of the reverse current reaches its peak.

[0056] In the above embodiment, the guide rod 210 is fixed to the inner wall of the housing 110 along the centerline of the housing in the X direction. As the diameter of the pipeline 600 and the medium pressure increase, two or more guide rods 210 can be arranged parallel to the centerline of the housing in the X direction to strengthen the overall stress resistance of the valve core unit. For example, two guide rods 210 can be arranged parallel to the centerline of the housing in the X direction. Figure 4 Additionally, depending on actual needs, the electromagnetic structure can also be located on different sides of the guide rod 210, such as... Figure 3d One side is located at point E in front of guide rod 210, and the other side is located at point D behind guide rod 210; if the electromagnetic structure is located at both ends of the center line of the Y direction of the outer shell, guide rod 210 can also be fixed to the inner wall of outer shell 110 parallel to the center line of the Y direction of the outer shell, such as Figure 5 No restrictions are imposed here.

[0057] The first electromagnetic structure 131 and the second electromagnetic structure 132 receive forward power, reverse power, current increase, current decrease and power off commands from the control unit 300 through the first electromagnetic structure control signal line and the second electromagnetic structure control signal line, respectively, and transmit their operating status to the control unit 300 through the first electromagnetic structure status signal line and the second electromagnetic structure status signal line, respectively.

[0058] As an example, when the flowing medium in pipe 600 is drinking water or washing water, the material of screen 220 is non-toxic silicone rubber sheet molded metal wire; when the flowing medium in pipe 600 is other low-temperature liquids or gases, such as seawater or wind, the material of screen 220 is ordinary rubber sheet molded metal wire; when the flowing medium in pipe 600 is a high-temperature liquid or gas with a temperature ≤250℃, the material of screen 220 is polytetrafluoroethylene sheet molded metal wire; when the flowing medium in pipe 600 is an ultra-high temperature liquid or gas with a temperature >250℃, the material of screen 220 is aerogel sheet molded metal wire.

[0059] Specifically, the 220 screen has a folding structure, requiring extension when opened and folding when closed. Therefore, the toughness, plasticity, and strength of its material are crucial. Whether it's a non-toxic silicone rubber sheet, a regular rubber sheet, a polytetrafluoroethylene sheet, or an aerogel sheet, they are all soft, thin sheet materials. By molding soft, non-magnetic ultrafine metal wires into them, the screen can achieve both toughness and plasticity, as well as high strength. It can also ensure that the 220 screen opens and folds silently, while being lighter than traditional valves.

[0060] Polytetrafluoroethylene (PTFE) and aerogel are both non-flammable materials. Aerogel, as a novel nanomaterial, can withstand temperatures up to approximately 2000℃ and is widely used in the aerospace field. Besides its ability to withstand extremely high temperatures, aerogel can also adsorb harmful substances, purify water, and provide ventilation. Therefore, when the screen 220 is made of aerogel, the screen-type shut-off valve can be used in the liquid and ventilation systems of cleanrooms in medical and laboratory settings.

[0061] As an example, a pipe sealing structure 140 and a screen sealing structure 240 are also provided. The pipe sealing structure 140 is fixed at the openings at both ends of the outer casing 110, and the screen sealing structure 240 is fixed around the screen 220.

[0062] Specifically, such as Figure 3b In this embodiment, similar to a screen in real life, the screen 220 of the screen-type stop valve has several folded and connected male and female lines 221 and 222. The male lines 221 protrude forward, and the female lines 222 are recessed backward, allowing the screen 220 to extend and fold. A screen sealing ring, made of the same material as the screen 220, is provided around the screen 220. When the screen 220 is extended, its surrounding screen sealing ring completely fits against the inner wall of the outer casing 110 without gaps, achieving a watertight or airtight effect. Simultaneously, a pipe sealing ring, made of the same material as the screen 220 and the screen sealing ring, is also provided at each of the two openings of the outer casing 110, to achieve a watertight or airtight effect when fixed to the pipes at the left and right ends. The pipe sealing structure 140 and the screen sealing structure 240 are not limited to screen sealing rings and pipe sealing rings; other sealing structures can be used according to actual needs, and no restrictions are placed here.

[0063] As an example, along the extension direction of pipe 600, the distance between the two ends of the housing 110 is greater than the width of the screen 220 when fully folded. The screen-type gate valve only requires the distance L between the two ends of the housing 110 to be slightly wider than the screen 220 when fully folded. Therefore, whether round, rectangular, or square, screen-type gate valves are much shorter than traditional valves, occupying comparable space to butterfly valves and plate check valves, but their performance and application scenarios are superior to traditional butterfly valves and plate check valves. Screen-type gate valves can be installed on both horizontal and vertical pipes; and there are no requirements on the direction of medium flow, allowing bidirectional flow.

[0064] As an example, the guide rod 210 is detachably and fixedly connected to the housing 110. Specifically, each end of the guide rod 210 has a resilient locking pin, allowing for installation and removal from the housing 110. This facilitates the installation and maintenance of the valve core unit, and also makes it easier to clean or replace the internal screen 220 after prolonged use. Of course, other connection structures can also be used to achieve the detachable and fixed connection between the guide rod 210 and the housing 110; this is not a limitation.

[0065] As an example, a magnetic sensor 400 is provided in the electromagnetic structure, and / or a flow sensor 500 is provided in the pipeline 600. The magnetic sensor 400 and the flow sensor 500 are electrically connected to the control unit 300.

[0066] Specifically, in this embodiment, a magnetic sensor 400 is installed in each of the first electromagnetic structure 131 and the second electromagnetic structure 132 to monitor the magnetic field in real time, such as the magnitude of the magnetic force and the degree of polarity matching. When the magnetic field needs to be strengthened, the control unit 300 controls the corresponding electromagnetic structure to increase the current; when the magnetic field is too strong, the control unit 300 controls the corresponding electromagnetic structure to decrease the current. In this way, the opening, closing, and adjustment of the screen 220 are ensured to be smooth, and the screen 220 remains centered and unbiased whether it is extended or folded. The magnetic sensor 400 transmits the magnetic field signal to the control unit 300 through the magnetic sensor status signal line.

[0067] In addition to its function as a shut-off valve, the screen-type gate valve can also be used as a shut-off check valve. When used as a shut-off check valve, a flow sensor 500 must be installed on the pipe section 600 that prevents backflow, to monitor in real time whether there is reverse flow of the medium in that section of pipe 600. When the flow sensor 500 detects reverse flow of the medium, the control unit 300 automatically closes the screen-type gate valve. The flow sensor 500 transmits the flow signal to the control unit 300 through the flow sensor status signal line.

[0068] As an example, the control unit 300 is equipped with a control touch screen 310; the control unit is equipped with a remote control 320 and voice prompts; the control unit 300 is equipped with an upper-level control signal line 330 and an upper-level status signal line 340 to perform remote status and comprehensive fault alarm signal feedback, and to perform remote control.

[0069] Specifically, such as Figure 8 In this embodiment, the control unit 300 controls the operation of these devices and monitors their operating status, ensuring the intelligent and fully automatic operation of the present invention. Its power input line 330 is an AC 380V cable, meeting the power requirements of the ship. When the present invention is integrated into the overall piping system, the power input line 330 becomes the upper-level control signal line, receiving overall joint debugging and control from its upper-level piping control system.

[0070] like Figure 6a , 7a The control unit 300 is mounted on the housing 110, preferably with the housing 110 facing an easily operable direction. It features a control touchscreen 310 that displays the real-time operation and status of the air-operated shut-off valve. A prominent backlight indicates the valve's open / closed state; for example, a green light transitioning from dark to light indicates an increasing opening position, while a red light indicates the valve is closed. The touchscreen 310 enables intelligent, fully automatic control of the shut-off valve. Therefore, regardless of whether the invention is installed at a high or low location, the user can easily determine its open / closed status via the touchscreen 310. If the invention is installed in a remote location inaccessible to the user, a handheld remote control 320 is also provided. This allows for remote control operation, with the remote control's screen or the touchscreen 310 providing clear voice and visual prompts to indicate the valve's open / closed status and adjustment position. Unlike traditional valves, there is no need to climb high and low to observe the handwheel / handle position to determine the valve's open / closed status and degree of opening.

[0071] The control unit 300 transmits the operating status and comprehensive fault alarm signals of the present invention to the upper-level pipeline control system / the upper-level monitoring center of the ship via the upper-level status signal line 340; and receives remote control from the monitoring personnel of the upper-level pipeline control system / the upper-level monitoring center of the ship via the upper-level control signal line 330.

[0072] In summary, the screen-type gate valve of this invention is both a gate valve and can be combined with a flow sensor to become a gate check valve. It can be used in pipeline systems of any temperature and any medium, achieving watertight or airtight operation, thus ensuring high-performance operation of the pipeline system. It is lightweight, occupies little space, and is easy to install. It is sandwiched between flanges of two sections of the system pipeline and can be installed on both horizontal and vertical pipelines. It has no requirements on the direction of medium flow and allows bidirectional flow. It can be used in both marine and land-based construction, and can be used for both circular liquid pipelines and rectangular or square gas pipelines. The pipeline also... It can be installed close to the ceiling to increase floor height; the internal valve core unit is easy to disassemble and maintain; it operates silently and does not affect the work and life of personnel; when using aerogel as an internal switch screen, it can effectively adsorb harmful substances, purify water and ventilation, and is suitable for water and air systems in clean rooms such as medical and experimental facilities; it is easy to operate and observe, realizes intelligent and fully automatic operation, improves work efficiency and reduces workload. No matter how far away it is from the operator, it can be easily controlled and understood by the remote control and the light or voice prompts on the control touch screen to control and understand the opening, closing, gear adjustment and its operating status of the shut-off valve.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A screen-type stop valve, characterized in that, The screen-type shut-off valve includes at least: The valve body unit includes a housing, a fixing structure, and an electromagnetic structure. The housing is a hollow structure with openings at both ends. The fixing structure is circumferentially fixed to the side wall of the housing. Through the fixing structure, both ends of the housing are fixedly connected to pipelines. The electromagnetic structure is symmetrically fixed to the inner walls of opposite sides of the housing. The valve core unit, located inside the housing, includes a guide rod, a screen, and a magnet. Corresponding to the electromagnetic structure, the guide rod is parallel to the center line of the housing and fixed to the inner wall of the housing. The screen has an opening in the middle, through which the guide rod passes and is movably connected to the housing. The magnet, corresponding to the electromagnetic structure, is fixed at the folded edges on both sides of the screen with opposite magnetic poles. Under the magnetic force of the electromagnetic structure, the screen is driven to unfold and fold along the guide rod, and the position can be adjusted. When unfolded, the screen is completely flush with the inner wall of the housing. A control unit, which is fixed to the side wall of the housing and electrically connected to the valve body unit; When the screen-type shut-off valve is fully opened and needs to be adjusted, the electromagnetic structure applies a reverse current to generate a magnetic field that attracts the magnet. The reverse current gradually increases as the screen-type shut-off valve gradually reduces the amount of flowing medium and reaches its peak value when the screen-type shut-off valve is fully closed. The electromagnetic structure receives commands from the control unit via a control signal line, including forward power, reverse power, current increase, current decrease, and power off commands. It also feeds back the operating status of the electromagnetic structure to the control unit via a status signal line.

2. The screen-type shut-off valve according to claim 1, characterized in that: It is also provided with a pipeline sealing structure and a screen sealing structure. The pipeline sealing structure is fixed at the openings at both ends of the outer shell, and the screen sealing structure is fixed around the screen.

3. The screen-type stop valve according to claim 1, characterized in that: The guide rod is detachably and fixedly connected to the housing.

4. The screen-type shut-off valve according to claim 1, characterized in that: The number of guide rods is N, where N≥1.

5. The screen-type stop valve according to claim 1, characterized in that: When the medium flowing in the pipeline is drinking water or washing water, the screen is made of non-toxic silicone rubber sheet molded metal wire; when the medium flowing in the pipeline is other low-temperature liquids or gases, the screen is made of ordinary rubber sheet molded metal wire; when the medium flowing in the pipeline is a high-temperature liquid or gas with a temperature ≤250℃, the screen is made of polytetrafluoroethylene sheet molded metal wire; when the medium flowing in the pipeline is an ultra-high temperature liquid or gas with a temperature >250℃, the screen is made of aerogel sheet molded metal wire.

6. The screen-type shut-off valve according to claim 1, characterized in that: Along the direction of the pipeline extension, the distance between the two ends of the outer shell is greater than the width of the screen when it is fully folded.

7. The screen-type stop valve according to claim 1, characterized in that: A magnetic sensor is installed inside the electromagnetic structure, and / or a flow sensor is installed in the pipeline. The magnetic sensor and the flow sensor are electrically connected to the control unit.

8. The screen-type shut-off valve according to claim 1, characterized in that: The control unit is equipped with a control touch screen.

9. The screen-type stop valve according to claim 1, characterized in that: The control unit is equipped with a remote control and voice prompts.

10. The screen-type shut-off valve according to claim 1, characterized in that: The control unit is equipped with an upper-level control signal line and an upper-level status signal line for remote status and comprehensive fault alarm signal feedback, as well as for remote control.

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