Single-plate flat valve with anti-freezing function

Abstract

This invention relates to the field of flat plate valve technology, and more specifically, to a single-plate flat plate valve with antifreeze function, comprising: a valve body having an internal on / off channel formed by a valve seat for opening and closing a valve plate; a valve cover, sealed to the top of the valve body; a bracket, sealed to the top of the valve cover; a drive assembly, sealed to the top of the bracket; a valve stem, one end connected to the valve plate, and the other end passing through the valve cover and the bracket in sequence before connecting to the drive assembly; an antifreeze cavity formed between the valve cover, the bracket, the drive assembly, and the valve stem communicating with an antifreeze injection port provided on the bracket; the bracket is also provided with an antifreeze injection port for injecting antifreeze into the antifreeze cavity. This invention effectively solves the problem of valve inability to open or close due to freezing and jamming of the valve stem by filling the antifreeze cavity formed by the valve cover, the bracket, the drive assembly, and the valve stem with antifreeze, ensuring that the upper part of the valve stem is fully submerged in a liquid with an extremely low freezing point.

Description

Technical Field

[0001] This invention relates to the field of flat plate valve technology, and more specifically, to a single-plate flat plate valve with antifreeze function. Background Technology

[0002] Single-plate flat valves are a common shut-off device widely used in various industrial pipelines such as those in the petroleum and chemical industries. They utilize a drive mechanism to raise and lower the valve stem, which in turn causes the valve plate connected to the stem to slide between the valve seat, thus controlling the flow of the pipeline.

[0003] However, in cold environments or when conveying cryogenic media, existing single-plate flat valves have a significant drawback: the valve stem typically penetrates the valve cover and extends externally to connect with the drive mechanism. Moisture easily accumulates in the cavity formed by the valve cover, support, and bottom of the drive mechanism, or liquid can remain due to minor leaks from the internal seal. When the ambient temperature drops below freezing, this liquid freezes. Because the clearance between the valve stem and related components is minimal, the expansion of the ice layer generates a tremendous binding force, causing the valve stem to freeze solid and prevent normal movement. This freezing and jamming phenomenon directly causes valve malfunction, severely affecting the stable operation of the process and potentially leading to safety accidents.

[0004] Currently, while attempts have been made to alleviate this problem through external insulation or electric heat tracing, the former has limited effectiveness, while the latter suffers from drawbacks such as high energy consumption, complex systems, and inconvenience in applications requiring explosion-proof features. Therefore, there is an urgent need for a single-plate flat valve that can fundamentally and effectively prevent the valve stem and surrounding components from freezing, ensuring reliable opening and closing of the valve even in low-temperature environments. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a single-plate flat valve with antifreeze function, comprising: a valve body having an internal on / off channel formed by a valve seat for opening and closing of a valve plate; a valve cover sealed to the top of the valve body; a bracket sealed to the top of the valve cover; a drive assembly sealed to the top of the bracket; a valve stem having one end connected to the valve plate and the other end passing through the valve cover and the bracket in sequence and then connected to the drive assembly, and being driven to move up and down by the drive assembly; an antifreeze cavity formed between the valve cover, the bracket, the drive assembly, and the valve stem communicating with an antifreeze injection port provided on the bracket; and an antifreeze injection port provided on the bracket for injecting antifreeze into the antifreeze cavity.

[0007] Optionally, the single-plate flat valve with antifreeze function further includes a pressure maintaining system, which is connected to the antifreeze chamber through a pipe on the side of the bracket, and is used to provide a constant static pressure to the antifreeze chamber to dynamically compensate for changes in the volume of antifreeze in the antifreeze chamber.

[0008] Optionally, the pressure maintaining system includes: a reservoir whose bottom is connected to a pipe on the side of the support via an antifreeze filter mechanism; a piston assembly that is slidably and sealed within the reservoir and divides its interior into a liquid chamber connected to the pipe and an air chamber connected to the atmosphere; and a constant pressure spring disposed on the air chamber side and applying a constant force toward the liquid chamber to the piston assembly.

[0009] Optionally, the piston assembly includes: a piston disc that is sealed and slides within the liquid storage tank; a piston shaft at the top of the piston disc is slidably connected to a support block at the top of the liquid storage tank; the support block and the piston disc are connected by a constant pressure spring sleeved on the piston shaft; the piston disc is provided with an exhaust port for discharging gas from the antifreeze chamber; and a removable sealed threaded rubber plug is provided inside the exhaust port.

[0010] Optionally, a limiting frame with a transverse limiting groove is fixedly connected to the top of the piston shaft, and a limiting screw is threaded onto the support block, with the limiting screw inserted into the transverse limiting groove; the limiting frame is connected to the top of the longitudinal scale, the inner side of the longitudinal scale is slidably fitted with an upper observation ring fixedly installed on the outer wall of the liquid storage tank, and the bottom of the longitudinal scale is connected to a lower observation ring slidably fitted on the outer wall of the liquid storage tank, with the upper observation ring located between the limiting frame and the lower observation ring.

[0011] Optionally, a heat exchange jacket is provided on the outside of the liquid storage tank, with a heat exchange inlet at the bottom and a heat exchange outlet at the top.

[0012] Optionally, two pressure maintaining systems are provided, and the two pressure maintaining systems are sealed to two pipes on the side of the support.

[0013] Optionally, the antifreeze filtration mechanism includes: a direct current pipe sealed at one end within a pipe on the side of the support, the direct current pipe communicating with the tip of a conical guide box, and the other end of the conical guide box sealed to a box cover; the side of the conical guide box is connected to a conical converging box via multiple guide pipes, and the guide port of the conical converging box is connected to the bottom opening of the storage tank; a straight shaft fixed inside the box cover slides within a straight pipe, and an anti-detachment block on the side of the straight shaft slides within an anti-detachment groove on the side of the straight pipe; the closed end of the straight shaft and the straight pipe are connected by a pressure-bearing spring installed inside the straight pipe; a pressure-bearing shaft is fixed at the end of the straight pipe away from the box cover, and a conical filter screen is fixed on the pressure-bearing shaft; the conical filter screen abuts against the inner side of the conical guide box, and the conical end of the conical filter screen is inserted into the direct current pipe.

[0014] Optionally, a telescopic groove is provided at the end of the pressure-bearing shaft away from the straight pipe, and a telescopic slide shaft is slidably connected in the telescopic groove. The telescopic slide shaft and the inner side of the telescopic groove are connected by a reset spring set in the telescopic groove. A conical shield is fixed at the end of the telescopic slide shaft that is inserted into the DC pipe. The maximum outer diameter of the conical shield is smaller than the inner diameter of the DC pipe.

[0015] Optionally, multiple guide pipes are evenly arranged around the outside of the conical guide box, with one end of the multiple guide pipes inserted into the conical guide box facing the swirl impeller that is rotatably fitted on the straight pipe. The side of the swirl impeller is connected to a cleaning brush that is slidably fitted on the conical surface of the conical filter screen via a connecting rod.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: This invention relates to a single-plate flat valve with antifreeze function. By filling the antifreeze chamber, which is formed by the valve cover, bracket, drive assembly, and valve stem, with antifreeze, the upper part of the valve stem is completely submerged in a liquid with an extremely low freezing point. This fundamentally eliminates the possibility of moisture condensation and freezing or leakage freezing, effectively solving the problem of valve failure due to frozen valve stem. Furthermore, this invention incorporates a pressure maintenance system including a reservoir, piston, and constant pressure elements. This system dynamically compensates for the thermal expansion and contraction of the antifreeze due to temperature changes, providing a constant static pressure to the antifreeze chamber. This prevents excessive pressure during thermal expansion from damaging the seal and also prevents negative pressure during cold contraction from drawing in air and creating air gaps, ensuring long-term effectiveness and reliability of the antifreeze effect. This invention is applicable to various harsh working conditions, improving the overall operational reliability and service life of valves in low-temperature environments.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the single-plate flat valve with antifreeze function of the present invention. Figure 1 (No pressure maintenance system was installed); Figure 2 This is a schematic diagram of the single-plate flat valve with antifreeze function of the present invention. Figure 2 (Set up a pressure maintenance system); Figure 3 This is a partial schematic diagram of the single-plate flat valve with antifreeze function of the present invention; Figure 4 This is a partial cross-sectional view of the single-plate flat valve with antifreeze function of the present invention; Figure 5 This is a schematic diagram of the pressure maintaining system of the present invention; Figure 6 This is a schematic diagram of the antifreeze filtration mechanism of the present invention; Figure 7 This is a cross-sectional view of the antifreeze filtration mechanism of the present invention; Figure 8 This is a partial schematic diagram of the antifreeze filtration mechanism of the present invention; Figure 9 This is a cross-sectional view of the piston assembly and the liquid storage tank of the present invention; Icons: Valve body 1; Valve seat 2; Valve plate 3; Valve cover 4; Bracket 5; Drive assembly 6; Valve stem 7; Antifreeze inlet 8; Pressure maintaining system 9; Reservoir 901; Antifreeze filter mechanism 902; Piston assembly 903; Constant pressure spring 904; Piston disc 905; Piston shaft 906; Support block 907; Limiting frame 908; Limiting screw 909; Longitudinal scale 910; Upper observation ring 911; Lower observation ring 912; Straight tube 913; Conical guide box 914; Box cover 915; Guide pipe 916; Conical convergent box 917; Straight shaft 918; Straight pipe 919; Pressure bearing shaft 920; Conical filter screen 921; Telescopic sliding shaft 922; Reset spring 923; Conical shield 924; Swirl impeller 925; Cleaning brush 926. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0021] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0022] The following is in conjunction with the appendix Figure 1 - Appendix Figure 9 The present invention will be described in further detail below.

[0023] Example 1: like Figures 1-9As shown, a single-plate flat valve with antifreeze function includes: a valve body 1, which has an internal on / off channel formed by a valve seat 2 for opening and closing of a valve plate 3; a valve cover 4, which is sealed to the top of the valve body 1; a bracket 5, which is sealed to the top of the valve cover 4; a drive assembly 6, which is sealed to the top of the bracket 5; and a valve stem 7, one end of which is connected to the valve plate 3, and the other end passes through the valve cover 4 and the bracket 5 in sequence and is connected to the drive assembly 6, which drives the stem 7 to move up and down; the antifreeze cavity formed between the valve cover 4, the bracket 5, the drive assembly 6 and the valve stem 7 is connected to the antifreeze injection port 8 provided on the bracket 5.

[0024] The working principle and technical effects of the above scheme are as follows: In the antifreeze single-plate flat valve of the present invention, the valve body 1 has an on / off channel formed by the valve seat 2 inside, and the valve plate 3 can be opened and closed within this channel to control the flow of fluid. The valve cover 4 is sealed to the top of the valve body 1, the bracket 5 is sealed to the top of the valve cover 4, and the drive assembly 6 is sealed to the top of the bracket 5. One end of the valve stem 7 is connected to the valve plate 3, and the other end passes through the valve cover 4 and the bracket 5 in sequence before being connected to the drive assembly 6. The drive assembly 6 can drive the valve stem 7 to move up and down, thereby causing the valve plate 3 to open and close within the on / off channel. An antifreeze chamber is formed between the valve cover 4, the bracket 5, the drive assembly 6, and the valve stem 7. This antifreeze chamber communicates with the antifreeze inlet 8 located on the bracket 5, and the antifreeze function is achieved through antifreeze... Antifreeze can be injected into the antifreeze chamber through the liquid injection port 8. When the ambient temperature is low, the antifreeze can keep the temperature inside the antifreeze chamber warm and lower the freezing point, so that the ambient temperature around the valve stem 7 will not be too low and prevent the water around the valve stem 7 from freezing. Once the water around the valve stem 7 freezes, it will increase the resistance when the valve stem 7 moves, causing the valve stem 7 to get stuck and difficult to move up and down normally. The injected antifreeze can avoid this situation and ensure that the valve stem 7 can move up and down smoothly under the drive of the drive component 6, thereby realizing the normal opening and closing of the valve plate 3.

[0025] This invention, by setting an antifreeze chamber connected to the antifreeze injection port 8, effectively prevents the water around the valve stem 7 from freezing, avoiding the phenomenon of the valve stem 7 freezing and becoming stuck due to freezing. In low-temperature environments, the drive assembly 6 can still smoothly drive the valve stem 7 to rise and fall, allowing the valve plate 3 to open and close normally. This solves the problem of single-plate flat valves being difficult to open due to valve stem freezing and sticking in the prior art, improving the reliability and performance of single-plate flat valves in low-temperature environments. This antifreeze function is mainly achieved by forming an antifreeze chamber between the valve cover 4, bracket 5, drive assembly 6, and valve stem 7, and setting the antifreeze injection port 8. Based on the existing single-plate flat valve, the antifreeze function can be achieved simply by reasonably designing and arranging these components, reducing production costs and modification difficulty. The valve cover 4 is sealed to the top of the valve body 1, the bracket 5 is sealed to the top of the valve cover 4, and the drive assembly 6 is sealed to the top of the bracket 5. The entire valve has good sealing performance. In the structure that forms the antifreeze chamber, the sealed connection between each component can also prevent antifreeze leakage, ensuring that the antifreeze can play an effective antifreeze role in the antifreeze chamber, further improving the performance and stability of the valve.

[0026] Example 2: like Figures 1-9 As shown, the single-plate flat valve with antifreeze function further includes: a pressure maintaining system 9, which is connected to the antifreeze chamber via a pipe on the side of the bracket 5, for providing a constant static pressure to the antifreeze chamber to dynamically compensate for volume changes of the antifreeze fluid in the antifreeze chamber. The pressure maintaining system 9 includes: a reservoir 901, the bottom of which is connected to the pipe on the side of the bracket 5 via an antifreeze filter mechanism 902; a piston assembly 903, which is slidably and sealingly disposed within the reservoir 901, and divides its interior into a liquid chamber connected to the pipe and an air chamber connected to the atmosphere; and a constant pressure spring 904, disposed on the air chamber side and applying a constant force toward the liquid chamber to the piston assembly 903.

[0027] The working principle and technical effects of the above scheme are as follows: In the antifreeze-function single-plate flat valve of the present invention, the main function of the pressure maintaining system 9 is to provide a constant static pressure to the antifreeze chamber of the antifreeze-function single-plate flat valve to dynamically compensate for changes in the volume of antifreeze in the antifreeze chamber. The antifreeze chamber formed between the pressure maintaining system 9 and the valve cover 4, bracket 5, drive assembly 6, and valve stem 7 is connected to the antifreeze chamber through a pipe on the side of the bracket 5. When antifreeze is injected into the antifreeze chamber through the antifreeze inlet 8, the antifreeze chamber is gradually filled as antifreeze is continuously injected. After the antifreeze chamber is filled, the excess antifreeze will enter the reservoir 901 of the pressure maintaining system 9 through the pipe on the side of the bracket 5. The bottom of the reservoir 901 is connected to the pipe on the side of the bracket 5 through the antifreeze filter mechanism 902. The antifreeze filter mechanism 902 can filter out impurities in the antifreeze, ensuring the cleanliness of the antifreeze entering the reservoir 901. The antifreeze entering the reservoir 901 exerts pressure on the piston assembly 903, which is sealed and sliding within the reservoir 901. Since the piston assembly 903 divides the interior of the reservoir 901 into a liquid chamber connected to a pipe and a gas chamber connected to the atmosphere, the piston assembly 903 moves upward under the pressure of the antifreeze. During this upward movement, the piston assembly 903 compresses the constant pressure spring 904 located on the gas chamber side, storing elastic potential energy. During valve operation, the volume of antifreeze in the antifreeze chamber changes due to factors such as ambient temperature variations. When the ambient temperature decreases, the antifreeze volume may shrink, causing a drop in pressure within the antifreeze chamber. At this time, the elastic potential energy stored in the constant pressure spring 904 is released, pushing the piston assembly 903 towards the liquid chamber, forcing the antifreeze from the liquid chamber of the reservoir 901 into the antifreeze chamber through the pipe. This dynamically compensates for the reduced antifreeze volume in the antifreeze chamber, ensuring that the antifreeze chamber is always full of antifreeze and maintaining a constant static pressure. When the ambient temperature rises and the antifreeze expands, the excess antifreeze re-enters the reservoir 901, pushing the piston assembly 903 to further compress the constant pressure spring 904 to accommodate changes in antifreeze volume. The pressure maintenance system 9 ensures adequate antifreeze filling. When antifreeze is injected into the antifreeze chamber, this system ensures the chamber is fully filled. Once full, excess antifreeze enters the reservoir 901, pushing the piston assembly 903 and compressing the constant pressure spring 904. This prevents insufficient injection or overflow due to uncertainty about the antifreeze level, ensuring the effectiveness of the antifreeze function. Furthermore, the pressure maintenance system 9 automatically and dynamically compensates for changes in antifreeze volume caused by factors such as ambient temperature. When the antifreeze volume contracts, the pressure maintenance system 9 replenishes antifreeze promptly, preventing the risk of icing around the valve stem 7 due to insufficient antifreeze, further improving the valve's reliability in low-temperature environments.When the antifreeze expands, the piston assembly 903 and the constant pressure spring 904 store the excess antifreeze in the reservoir 901, preventing excessive pressure in the antifreeze chamber from damaging the valve structure and ensuring the valve's safety and stability. The constant pressure spring 904 applies a constant force towards the liquid chamber to the piston assembly 903, enabling the pressure maintaining system 9 to provide a constant static pressure to the antifreeze chamber. This helps maintain the stability of the valve's internal structure, reduces the impact of pressure fluctuations on the movement of the valve stem 7 and the valve's sealing performance, and improves the overall performance and service life of the valve.

[0028] The bottom of the liquid storage tank 901 is connected to the pipe on the side of the bracket 5 through the antifreeze filter mechanism 902. The antifreeze filter mechanism 902 is used to perform one-way filtration of the antifreeze entering the antifreeze chamber from the liquid storage tank 901, without affecting the entry of antifreeze with impurities in the antifreeze chamber into the liquid storage tank 901. The purpose is to effectively remove impurities in the antifreeze in the antifreeze chamber, remove impurities generated when the valve stem 7 and the drive assembly 6 work together, and remove impurities generated when the valve stem 7 works with other structures.

[0029] Example 3: like Figures 1-9 As shown, the piston assembly 903 includes: a piston disc 905 that is sealed and slides within the liquid storage tank 901; a piston shaft 906 at the top of the piston disc 905 is slidably connected to a support block 907 at the top of the liquid storage tank 901; the support block 907 and the piston disc 905 are connected by a constant pressure spring 904 sleeved on the piston shaft 906; the piston disc 905 is provided with an exhaust port for discharging gas from the antifreeze chamber; and a removable sealed threaded rubber plug is installed inside the exhaust port. The piston shaft 906 is fixedly connected to the top of the limiting frame 908 with a transverse limiting groove. The supporting block 907 is threadedly connected to the limiting screw 909, which is inserted into the transverse limiting groove. The limiting frame 908 is connected to the top of the longitudinal scale 910. The inner side of the longitudinal scale 910 is slidably engaged with the upper observation ring 911 fixedly installed on the outer wall of the liquid storage tank 901. The bottom of the longitudinal scale 910 is connected to the lower observation ring 912 slidably engaged on the outer wall of the liquid storage tank 901. The upper observation ring 911 is located between the limiting frame 908 and the lower observation ring 912.

[0030] The working principle and technical effects of the above scheme are as follows: In the single-plate flat valve with antifreeze function of the present invention, the piston assembly 903 mainly consists of a piston disc 905 and a piston shaft 906. Piston disc 905 slides within the reservoir 901, dividing the interior of the reservoir 901 into a liquid chamber and a gas chamber. When antifreeze enters the liquid chamber of the reservoir 901 through a pipe, the antifreeze exerts pressure on piston disc 905, pushing it upward. Piston shaft 906 at the top of piston disc 905 is slidably connected to support block 907 at the top of reservoir 901, ensuring the stability and linearity of piston disc 905's movement. Support block 907 and piston disc 905 are connected by a constant pressure spring 904 sleeved on piston shaft 906. When piston disc 905 moves upward, it compresses constant pressure spring 904, storing elastic potential energy. When the volume of antifreeze in the antifreeze chamber shrinks, constant pressure spring 904 releases elastic potential energy, pushing piston disc 905 downward, forcing antifreeze from the liquid chamber of reservoir 901 into the antifreeze chamber. The piston disc 905 is equipped with a vent. During the initial stage of injecting antifreeze into the antifreeze chamber, the gas inside the antifreeze chamber can be discharged through the vent, preventing the antifreeze from being blocked due to gas accumulation. When the antifreeze is full and the vent needs to be sealed, a removable rubber plug can be threadedly connected to the vent to prevent antifreeze from leaking out of the vent.

[0031] A limiting bracket 908 with a transverse limiting groove is fixedly connected to the top of the piston shaft 906. A limiting screw 909 is threaded onto the support block 907 and is inserted into the transverse limiting groove. This structure can limit the movement of the piston shaft 906 to a certain extent, so that when the coolant tank 901 is not needed to store antifreeze, the piston disc 905 will not be pushed by pressure, thus stopping the pressure maintaining system 9 from working. When the pressure maintaining system 9 needs to be used, the limiting screw 909 must first be removed or disengaged from the transverse limiting groove.

[0032] The limiting frame 908 is connected to the top of the longitudinal scale 910. The inner side of the longitudinal scale 910 is slidably engaged with the upper observation ring 911, which is fixedly installed on the outer wall of the reservoir 901. The bottom of the longitudinal scale 910 is connected to the lower observation ring 912, which is slidably engaged with the outer wall of the reservoir 901. The upper observation ring 911 is located between the limiting frame 908 and the lower observation ring 912. When the piston disc 905 moves, it will drive the piston shaft 906 and the limiting frame 908 to move together, thereby causing the longitudinal scale 910 to slide along the upper observation ring 911 and the lower observation ring 912. By observing the scale on the longitudinal scale 910, the position of the piston disc 905 can be intuitively understood, and thus the volume change of the antifreeze in the antifreeze chamber can be determined.

[0033] In this invention, the cooperation between the piston disc 905 and the piston shaft 906, and the sliding connection between the piston shaft 906 and the support block 907, make the movement of the piston assembly 903 within the liquid storage tank 901 more stable and linear, reduce the shaking and offset of the piston disc 905 during movement, ensure that the pressure maintenance system 9 can accurately provide a constant static pressure to the antifreeze chamber, and improve the reliability of the system.

[0034] In addition, the observation structure consisting of the longitudinal scale 910, the upper observation ring 911, and the lower observation ring 912 allows the operator to intuitively observe the positional changes of the piston disc 905, thereby understanding the volume changes of the antifreeze in the antifreeze chamber. This helps to detect abnormal changes in the antifreeze volume in a timely manner, such as antifreeze leakage or excessive expansion, which facilitates valve maintenance and adjustment, and improves the maintainability and safety of the valve.

[0035] Example 4: like Figures 1-9 As shown, the storage tank 901 is equipped with a heat exchange jacket, with a heat exchange inlet at the bottom and a heat exchange outlet at the top. Two pressure maintenance systems 9 are provided, and each of the two pressure maintenance systems 9 is sealed to one of the two pipes on the side of the support 5.

[0036] The working principle and technical effects of the above scheme are as follows: In the antifreeze single-plate flat valve of the present invention, although two pressure maintaining systems 9 are provided simultaneously, only one pressure maintaining system 9 needs to be injected with antifreeze when injecting antifreeze. The purpose of the other pressure maintaining system 9 is for the flow of antifreeze. The limiting screw 909 of the pressure maintaining system 9 is inserted into the transverse limiting groove to prevent it from working. A path for the flow of antifreeze is formed between the liquid storage tank 901 of the two pressure maintaining systems 9 and the antifreeze chamber. A heat exchange jacket is provided outside the liquid storage tank 901. The bottom and top of the heat exchange jacket are respectively provided with a heat exchange inlet and a heat exchange outlet. When it is necessary to open the single-plate flat valve, a heat exchange medium of a certain temperature can be injected into the heat exchange jacket through the heat exchange inlet, and the heat exchange medium can be allowed to pass through the heat exchange outlet. The outlet outputs heat to the antifreeze in the storage tank 901 through a circulating heat exchange medium, and simultaneously controls the flow of antifreeze between the storage tank 901 and the antifreeze chamber of the two pressure maintenance systems 9. This allows the antifreeze to be effectively heat-exchanged, improving its antifreeze and defrosting effect and facilitating valve opening. When controlling the flow of antifreeze, the limiting screw 909 in the pressure maintenance system 9 without antifreeze can be disengaged from the transverse limiting groove. Then, the limiting bracket 908 can be pulled by hand to drive the piston shaft 906 connected to it to move upward. The piston shaft 906 drives the piston disc 905 connected to it to move, thereby cooperating with the storage tank 901 to extract the antifreeze, allowing the antifreeze to flow between the storage tank 901 and the antifreeze chamber of the two pressure maintenance systems 9.

[0037] Example 5: like Figures 1-9 As shown, the antifreeze filtration mechanism 902 includes: a direct current pipe 913 sealed at one end within a pipe on the side of the bracket 5, the direct current pipe 913 communicating with the tip of a conical guide box 914, and the other end of the conical guide box 914 sealed to a cover 915; the side of the conical guide box 914 is connected to a conical convergent box 917 via multiple guide pipes 916, and the guide port of the conical convergent box 917 is connected to the bottom opening of the storage tank 901; a straight shaft 918 fixed inside the cover 915 is slidably fitted onto the straight shaft 918. Inside the tube 919, the anti-detachment block on the side of the straight shaft 918 slides in the anti-detachment groove on the side of the straight tube 919. The straight shaft 918 and the closed end of the straight tube 919 are connected by a pressure-bearing spring installed inside the straight tube 919. A pressure-bearing shaft 920 is fixed to the end of the straight tube 919 away from the cover 915. A conical filter screen 921 is fixed on the pressure-bearing shaft 920. The conical filter screen 921 abuts against the inner side of the conical flow guide box 914, and the conical end of the conical filter screen 921 is inserted into the direct current tube 913. A telescopic groove is provided at the end of the pressure-bearing shaft 920 away from the straight pipe 919. The telescopic shaft 922 is slidably connected in the telescopic groove. The telescopic shaft 922 is connected to the inner side of the telescopic groove by a reset spring 923 set in the telescopic groove. A conical shield 924 is fixed at the end of the telescopic shaft 922 that is inserted into the DC pipe 913. The maximum outer diameter of the conical shield 924 is smaller than the inner diameter of the DC pipe 913.

[0038] The working principle and technical effects of the above scheme are as follows: In the antifreeze-function single-plate flat valve of the present invention, the antifreeze filtration mechanism 902 is used to perform unidirectional filtration of the antifreeze entering the antifreeze chamber from the storage tank 901, without affecting the entry of antifreeze containing impurities into the storage tank 901. When the antifreeze enters the direct flow pipe 913 from the antifreeze chamber, it generates an impact pressure on the conical shield 924, causing the conical shield 924 to move towards the outer conical surface of the conical filter screen 921, shielding the filter holes of the conical filter screen 921. At this time, the conical shield 924 drives the telescopic sliding shaft 922 to slide in the telescopic sliding groove. When the cone-shaped shield 924 covers the cone-shaped filter 921, it compresses the reset spring 923. Under pressure, the cone-shaped shield 924 moves the cone-shaped filter 921 towards the cover 915. The cone-shaped filter 921 moves the pressure-bearing shaft 920, which in turn moves the straight pipe 919 on the straight shaft 918, compressing the pressure spring. At this time, the cone-shaped filter 921 detaches from the inner side of the cone-shaped guide box 914, allowing antifreeze to enter the cone-shaped guide box 914 through the gap between them, and then pass through multiple guide pipes 916 and the cone-shaped... The converging box 917 leads into the reservoir 901, ensuring that the antifreeze is not filtered when entering the reservoir 901 from the antifreeze chamber and does not adhere to the conical filter screen 921. When the antifreeze in the reservoir 901 enters the antifreeze chamber, it passes through the conical converging box 917 and multiple guide pipes 916 into the conical guide box 914. Because the conical filter screen 921 remains attached to the inner surface of the conical guide box 914 under the elastic force of the pressure spring, the antifreeze must pass through the conical filter screen 921 before entering the direct current pipe 913, thus achieving… The current one-way filtration of antifreeze allows the antifreeze to flow through the gap between the cone shield 924 and the DC pipe 913 because the maximum outer diameter of the cone shield 924 is smaller than the inner diameter of the DC pipe 913. This prevents the antifreeze from flowing through the gap. This structure allows for one-way filtration of the antifreeze entering the antifreeze chamber from the reservoir 901 without affecting the entry of antifreeze containing impurities into the reservoir 901. It effectively removes impurities from the antifreeze in the antifreeze chamber, as well as impurities generated when the valve stem 7 and the drive assembly 6 work together, and impurities generated when the valve stem 7 works with other structures.

[0039] Example 6: like Figures 1-9 As shown, multiple guide pipes 916 are evenly arranged around the outside of the conical guide box 914. One end of the multiple guide pipes 916 inserted into the conical guide box 914 is arranged towards the swirl impeller 925 that is rotatably fitted on the straight pipe 919. The side of the swirl impeller 925 is connected to the cleaning brush 926 that is slidably fitted on the inner conical surface of the conical filter screen 921 through a connecting rod.

[0040] The working principle and technical effects of the above scheme are as follows: In the antifreeze single-plate flat valve of the present invention, when the coolant in the storage tank 901 flows into the antifreeze chamber, the coolant enters the conical guide box 914 through multiple guide pipes 916, which can impact the impeller body at different positions of the swirl impeller 925 to form a swirling flow, and can drive the swirl impeller 925 to rotate. The rotation of the swirl impeller 925 can drive the cleaning brush 926 to move on the conical surface inside the conical filter screen 921 through the connecting rod, so as to achieve preliminary cleaning of the conical filter screen 921 and reduce the probability of clogging of the conical filter screen 921.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A single-plate flat valve having a freeze-proof function, characterized by include: The valve body has an internal on / off channel formed by the valve seat for the valve plate to open and close; Valve cover, sealed to the top of the valve body; bracket, sealed to the top of the valve cover; drive assembly, sealed to the top of the bracket; The valve stem is connected to the valve plate at one end and passes through the valve cover and bracket in sequence at the other end before being connected to the drive assembly, which drives its lifting and lowering. The antifreeze cavity formed between the valve cover, bracket, drive assembly and valve stem is connected to the antifreeze injection port set on the bracket; It also includes: pressure maintenance systems; The pressure maintenance system includes: a liquid storage tank, the bottom of which is connected to a pipe on the side of the support via an antifreeze filter mechanism; The antifreeze filtration mechanism includes: a direct current pipe sealed at one end within a pipe on the side of a bracket, the direct current pipe communicating with the tip of a conical guide box, and the other end of the conical guide box sealed to a cover; the side of the conical guide box is connected to a conical converging box via multiple guide pipes, and the guide port of the conical converging box is connected to the bottom opening of the storage tank; a straight shaft fixed inside the cover slides within a straight pipe, and an anti-detachment block on the side of the straight shaft slides within an anti-detachment groove on the side of the straight pipe; the closed end of the straight shaft and the straight pipe are connected by a pressure-bearing spring installed inside the straight pipe; a pressure-bearing shaft is fixed at the end of the straight pipe away from the cover, and a conical filter screen is fixed on the pressure-bearing shaft; the conical filter screen abuts against the inner side of the conical guide box, and the conical end of the conical filter screen is inserted into the direct current pipe; A telescopic groove is opened at the end of the pressure-bearing shaft away from the straight pipe. The telescopic shaft is slidably connected in the telescopic groove. The telescopic shaft and the inner side of the telescopic groove are connected by a reset spring set in the telescopic groove. A conical shield is fixed at the end of the telescopic shaft that is inserted into the DC pipe. The maximum outer diameter of the conical shield is smaller than the inner diameter of the DC pipe. When the antifreeze enters the DC pipe, it exerts an impact pressure on the conical shield, causing the conical shield to move towards the outer cone surface of the conical filter screen and cover the filter holes of the conical filter screen.

2. The single-plate flat valve with antifreeze function according to claim 1, characterized in that, The pressure maintenance system is connected to the antifreeze chamber through a pipe on the side of the support, and is used to provide a constant static pressure to the antifreeze chamber to dynamically compensate for changes in the volume of antifreeze in the antifreeze chamber.

3. The single-plate flat valve with antifreeze function according to claim 2, characterized in that, The pressure maintaining system also includes: a piston assembly, which is slidably and sealed within the liquid reservoir and divides its interior into a liquid chamber connected to a pipe and a gas chamber connected to the atmosphere; and a constant pressure spring, which is disposed on the gas chamber side and applies a constant force toward the liquid chamber to the piston assembly.

4. The single-plate flat valve with antifreeze function according to claim 3, characterized in that, The piston assembly includes: a piston disc that is sealed and slides within the liquid storage tank; a piston shaft at the top of the piston disc is slidably connected to a support block at the top of the liquid storage tank; the support block and the piston disc are connected by a constant pressure spring sleeved on the piston shaft; the piston disc is provided with an exhaust port for discharging gas from the antifreeze chamber; and a removable sealed threaded rubber plug is provided inside the exhaust port.

5. The single-plate flat valve with antifreeze function according to claim 4, characterized in that, A limiting frame with a transverse limiting groove is fixedly connected to the top of the piston shaft. A limiting screw is threaded onto the support block and inserted into the transverse limiting groove. The limiting frame is connected to the top of the longitudinal scale. The inner side of the longitudinal scale is slidably fitted with the upper observation ring fixedly installed on the outer wall of the liquid storage tank. The bottom of the longitudinal scale is connected to the lower observation ring slidably fitted on the outer wall of the liquid storage tank. The upper observation ring is located between the limiting frame and the lower observation ring.

6. The single-plate flat valve with antifreeze function according to claim 5, characterized in that, The storage tank is equipped with a heat exchange jacket, with a heat exchange inlet at the bottom and a heat exchange outlet at the top.

7. The single-plate flat valve with antifreeze function according to claim 5, characterized in that, There are two pressure maintenance systems, and the two pressure maintenance systems are sealed to the two pipes on the side of the support.

8. The single-plate flat valve with antifreeze function according to claim 1, characterized in that, Multiple guide tubes are evenly arranged around the outside of the conical guide box. One end of the multiple guide tubes is inserted into the conical guide box and is set towards the swirl impeller that is rotatably fitted on the straight tube. The side of the swirl impeller is connected to the cleaning brush that is slidably fitted on the conical surface of the conical filter screen through a connecting rod.

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