Pneumatic control valve

Abstract

The application belongs to the technical field of valve, disclose a kind of pneumatic control valve, including: valve body, valve cover, water inlet pipe, water outlet pipe, cylinder, pneumatic drive mechanism, ball valve, water pipe and impurity cleaning mechanism, valve cover can be dismantled and is arranged on valve body;Valve body both ends are fixedly provided with water inlet pipe and water outlet pipe;Water inlet pipe is fixedly connected with water pipe by flange;Water inlet of water inlet pipe is detachably fixedly provided with filter screen;Water pipe is provided with impurity cleaning mechanism;Valve body and valve cover between rotatably provided with ball valve, ball valve is detachably fixedly provided with valve rod;Valve cover upper end is fixedly provided with cylinder, cylinder is provided with pneumatic drive mechanism;Pneumatic drive mechanism is transmission connection with valve rod.The utility model through multistage filtration and automatic impurity removal, guarantee heating unobstructed and convenient operation, impurity cleaning mechanism is automatically triggered by pressure difference, without manual intervention;Scraping blade mechanical scraping, drainage pump powerful suction, filter box three-stage filtration, high impurity removal rate.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more specifically, to a pneumatic control valve. Background Technology

[0002] In large-scale centralized heating systems of heating companies, pneumatic valves have strong application value due to their advantages such as fast response speed, high control accuracy, and suitability for automated control.

[0003] Existing technology publication CN117646807A discloses a pneumatic valve, belonging to the field of pneumatic valves. It includes a pneumatic valve body, with a pressure shell fixedly mounted on the top. A regulating mechanism is provided on the top of the pressure shell. This regulating mechanism controls the pneumatic valve body's open and closed state when power is off. An air supply mechanism is located on the top of the pressure shell, adjacent to the regulating mechanism. By setting the regulating mechanism, the positioning rod can be moved to de-engage with the positioning groove, and then the rotating disk can be rotated, allowing adjustment of the positions of the air inlet and outlet cylinders. This controls whether the pneumatic valve body is closed or open when power is off, avoiding the problem of existing pneumatic valve bodies only being in one state when power is off, which cannot be adjusted and leads to poor adaptability.

[0004] While the existing technical solutions described above can achieve the relevant beneficial effects through their structure, they still have the following drawbacks: 1. Large particulate impurities (such as silt, rust, etc.) in the hot water of the heating system can lead to narrow flow channels, valve core jamming, and consequently, insufficient local flow and reduced heat exchange efficiency. 2. The impurity removal process requires manual judgment of the filter screen's clogging status (such as observing the pressure gauge and periodically disassembling and inspecting), and cleaning requires stopping the machine and shutting off the water supply, affecting the continuity of wastewater treatment, especially in emergency situations where wastewater may stagnate. Existing technologies often directly discharge wastewater containing impurities during impurity removal, resulting in wasted water resources with each cleaning. 3. In existing technologies, the valve body and cylinder often use ordinary metal connecting seats (such as carbon steel or ordinary aluminum alloy) or single-layer resin gaskets, which have high thermal conductivity. The high temperature generated during valve body operation is directly conducted to the cylinder through the connecting structure, causing the internal seals (such as polyurethane sealing rings and nitrile rubber gaskets) and solenoid valve coils to be exposed to high temperatures for extended periods. This accelerates component aging, shortens service life, requires frequent replacement of drive components, increases maintenance frequency, and affects continuous equipment operation.

[0005] In view of this, we propose a pneumatic control valve and method. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] The purpose of this application is to provide a pneumatically controlled valve that solves the technical problems mentioned in the background section. It achieves multi-stage filtration and automated impurity removal, ensuring smooth heating and convenient operation and maintenance. The filter screen can intercept silt, rust, and scale crystals in the heating water, effectively preventing impurities from entering the ball valve, subsequent pipes, and radiators, avoiding flow channel blockage, reduced heat exchange efficiency, and lowering the failure rate of downstream equipment. The impurity cleaning mechanism is automatically triggered by differential pressure, requiring no manual intervention. The three-stage filtration system—mechanical scraping by a scraper, powerful suction by a drain pump, and filtration by a filter box—results in a high impurity removal rate. The entire process requires no downtime and does not affect heating. The efficient heat insulation design protects the drive components and ensures stable operation.

[0008] 2. Technical Solution

[0009] This application provides a pneumatic control valve, including: valve body, valve cover, inlet pipe, outlet pipe, cylinder, pneumatic drive mechanism, ball valve, water delivery pipe and impurity cleaning mechanism;

[0010] The valve cover is detachably fixed to the valve body;

[0011] The valve body is fixedly equipped with an inlet pipe and an outlet pipe at both ends; flanges are fixedly installed on the outside of both the inlet pipe and the outlet pipe; the inlet pipe, the outlet pipe and the valve body are made of 316 stainless steel.

[0012] The water inlet pipe is detachably and fixedly connected to the water supply pipe via a flange; both ends of the water supply pipe are fixedly equipped with flanges; a filter screen is detachably and fixedly installed at the water inlet of the water inlet pipe; the filter screen adopts a double-layer composite structure, and the edge of the filter screen is embedded with a silicone rubber sealing ring, which is detachably connected to the water inlet pipe by a buckle.

[0013] The water supply pipe is equipped with an impurity cleaning mechanism; impurities can be scraped off the filter screen through the impurity cleaning mechanism, and the impurities can be filtered.

[0014] A ball valve is rotatably installed between the valve body and the valve cover, and a valve stem is detachably fixed on the ball valve; a water passage hole is opened on the ball valve; the ball valve is forged from 316 stainless steel, and the water passage hole is eccentrically designed, so that when it is opened, the water flow forms a reverse flush on the valve seat, reducing the adhesion of impurities; the sealing surface is made of Stellite alloy overlay welding, which is wear-resistant and adaptable to the temperature fluctuation of heating hot water.

[0015] A cylinder is fixedly installed on the upper end of the valve cover, and a pneumatic drive mechanism is installed inside the cylinder;

[0016] The pneumatic drive mechanism is connected to the valve stem drive. The pneumatic drive mechanism can drive the ball valve to rotate through the valve stem, so as to open the valve to supply water or close the valve to stop supplying water.

[0017] The above technical solution connects the valve body, inlet pipe, outlet pipe, and supply pipe to the heating hot water pipe. The pneumatic drive mechanism rotates the ball valve via the valve stem, opening the valve to supply water or closing it to stop supplying water. During normal operation, the pneumatic drive mechanism rotates the ball valve to the fully open position, and the heating hot water is delivered through the supply pipe, filter screen, valve body, and outlet pipe. At this time, the impurity cleaning mechanism is in standby mode, and the magnetic plate continuously attracts ferromagnetic impurities. The filter screen intercepts and filters impurities in the heating water; the impurity cleaning mechanism scrapes away impurities from the filter screen and filters them. When the pressure difference across the filter screen exceeds the standard, the impurity cleaning mechanism scrapes away impurities from the filter screen.

[0018] As an optional solution of this utility model, a stepped groove is provided in the valve body, and a hemispherical groove A is provided on the inner side of the stepped groove; a circular hole is provided in the valve body to communicate with the inlet pipe and the outlet pipe, and the diameter of the circular hole is consistent with the inner diameter of the inlet pipe and the outlet pipe; the stepped groove adopts a two-stage stepped design.

[0019] The valve cover is fixedly provided with a stepped protrusion, and a sealing block is fixedly provided on the stepped protrusion. The sealing block has a hemispherical groove B. The valve cover is made of 316 stainless steel.

[0020] The hemispherical groove B and hemispherical groove A are engaged together to limit the movement of the ball valve, allowing the ball valve to rotate within the hemispherical groove B and hemispherical groove A.

[0021] A water passage hole is provided on the sealing block, and the water passage hole penetrates the sealing block; the diameter of the water passage hole is consistent with the inner diameter of the inlet pipe and the outlet pipe.

[0022] Three density ring grooves are provided on the stepped protrusion, and each density ring groove is equipped with a rubber elastic sealing ring to improve the sealing performance of the valve cover and valve body connection.

[0023] Three annular grooves are arranged axially on the stepped protrusion, with a cross-section consisting of a combination of trapezoidal and rectangular shapes.

[0024] The first, outermost layer: a trapezoidal groove with a built-in D-shaped fluororubber sealing ring. The lip faces the outside of the valve body, which can prevent external dust and moisture from entering.

[0025] The second layer, in the middle: a rectangular groove with a built-in O-ring nitrile rubber seal, is the main seal for heating hot water.

[0026] The third, innermost layer: a rectangular groove with a built-in polyurethane U-shaped sealing ring. The lip faces inward to the valve body, forming a reverse seal. When the internal water pressure fluctuates, the U-shaped lip will press tightly against the cover as the pressure increases, enhancing the sealing effect.

[0027] A polytetrafluoroethylene (PTFE) guide ring is embedded at the edge of the hemispherical groove B, which not only provides lubrication for the rotation of the ball valve, but also prevents small impurities from entering the groove. A miniature oil reservoir is provided on the inner side of the PTFE guide ring, which is filled with high-temperature grease to reduce dry friction wear.

[0028] As an optional embodiment of this utility model, an air inlet pipe is fixedly installed on the cylinder, and a square groove is formed on the cylinder; a plug plate is detachably fixed at the end of the square groove. A solenoid valve is fixedly installed on the air inlet pipe; the air inlet pipe is made of stainless steel corrugated pipe, and both ends are connected to the cylinder and the air source pipeline through compression fittings; the solenoid valve is a two-position five-way pilot-operated solenoid valve; the coil protection level is IP65, suitable for the humid environment of the heating machine room; a built-in manual emergency button is included.

[0029] A thermal isolation seat is detachably fixed between the cylinder and the valve cover by countersunk bolts;

[0030] The pneumatic drive mechanism includes a sliding sealing plug, a toothed plate, a gear, and a return spring;

[0031] A sliding sealing plug is provided inside the cylinder for sealing and sliding.

[0032] A toothed plate is fixedly installed on the sliding sealing plug; the toothed plate is slidably set in a square groove; the sliding sealing plug is forged from aluminum alloy (6061-T6), and a combination sealing component is embedded at both ends; the combination sealing component includes a polyurethane U-ring and a polytetrafluoroethylene guide ring, with the polyurethane U-ring as the main seal and the polytetrafluoroethylene guide ring as the auxiliary guide, ensuring that there is no uneven wear and no gas leakage when sliding in the circular groove.

[0033] A return spring is installed inside the square groove, and one end of the return spring is fixedly connected to the toothed plate.

[0034] A gear is rotatably mounted inside the cylinder; the gear meshes with a gear plate for transmission.

[0035] The cylinder has a circular groove, and a sliding sealing plug is mounted within this groove to ensure a tight seal. An angle sensor is fixedly mounted on the gear to monitor the rotation angle of the ball valve.

[0036] The above technical solution involves injecting compressed gas into the circular groove of the cylinder through the intake pipe, which pushes the sliding sealing plug to move. The sliding sealing plug then moves the gear plate, which in turn drives the gear to rotate, thus opening or closing the ball valve.

[0037] As an optional solution of this utility model, the thermal insulation seat consists of, from bottom to top: a 5 mm glass fiber reinforced phenolic resin layer, a nano silica aerogel felt and a 2 mm glass fiber reinforced phenolic resin layer.

[0038] Five-millimeter glass fiber reinforced phenolic resin layer: resists direct impact from high temperature of valve body; provides structural support and withstands assembly preload; reduces infrared heat radiation absorption;

[0039] Nano-silica aerogel felt: blocks more than 90% of conductive heat; built-in air insulation cavity and reflective layer to enhance radiative / convection insulation;

[0040] Two-millimeter glass fiber reinforced phenolic resin layer; protects the core aerogel felt from cylinder side moisture / dust corrosion; ensures assembly sealing.

[0041] In the middle of the nano-silica aerogel felt layer, a ring-shaped air insulation cavity is opened along the center of the isolation seat, and an aluminum foil reflective layer and supporting ribs are set inside the cavity;

[0042] Aluminum foil reflective layer: A 0.05mm thick high-purity aluminum foil is bonded to the upper and lower walls of the air cavity with a high-temperature resistant adhesive to block the radiative heat transfer from the valve body to the cylinder;

[0043] Support ribs: Four cross-shaped support ribs are evenly distributed along the circumference inside the air cavity to prevent the air cavity from collapsing due to assembly pressure, while not affecting the static heat insulation effect of the air.

[0044] A fully enclosed heat insulation component is installed at the countersunk bolt mounting hole between the cylinder and the valve cover. The fully enclosed heat insulation component specifically includes:

[0045] Stepped composite thermal insulation sleeve: Embedded in bolt holes, it has a three-section cylindrical structure: the middle section is made of polytetrafluoroethylene with a polished inner wall to prevent direct contact between the bolt rod and the insulating seat; the two ends are made of glass fiber reinforced polyimide (containing 40% glass fiber) to prevent the thermal insulation sleeve from being crushed when the bolts are tightened; the thermal insulation sleeve and the bolt holes are fitted with an interference fit without gaps to further reduce heat penetration.

[0046] Mica thermal insulation gasket: It is a thin, circular sheet placed between the head of the countersunk bolt and the bottom of the countersunk hole of the isolation seat; it completely blocks the metal contact between the bolt head and the surface of the isolation seat, eliminating the last thermal bridge.

[0047] Through the above technical solution, the thermal insulation seat serves as a heat insulation element.

[0048] As an optional solution of this utility model, the impurity cleaning mechanism includes a micro motor, a scraper, a universal joint, a drain pipe, a return water pipe, a drain pump, a filter box, and a sealing door;

[0049] A micro motor is fixedly installed at one end of the water supply pipe; a universal joint is installed on the water supply pipe for sealing and rotation; the micro motor is a high-temperature resistant DC geared motor; the scraper adopts a composite structure of polyurethane scraper strips and stainless steel frame; the scraper is divided into three groups along the radial direction of the filter screen.

[0050] A scraper is rotatably installed at one end of the water supply pipe, and the scraper rubs against the filter screen.

[0051] One end of the universal joint is coaxially and fixedly connected to the output end of the micro motor; the other end of the universal joint is fixedly connected to the scraper. The micro motor drives the scraper to rotate through the universal joint, removing impurities adhering to the filter screen. Pressure sensors are installed on both sides of the filter screen.

[0052] Drain pipes and return pipes are fixedly installed at the bottom of both ends of the water supply pipe; both the drain pipe and the return pipe are equipped with check valves. The check valves are spring-loaded check valves with brass valve bodies and fluororubber seals.

[0053] A filter box is fixedly installed below the drain pipe, and a filter bag is removably installed inside the filter box. A drain pump is fixedly installed above the filter box, and the output end of the drain pump is connected to the water supply pipe. A rotatable sealing door is installed on the filter box. A diffused silicon pressure sensor is installed on both the upstream and downstream sides of the filter screen to monitor the pressure difference in real time.

[0054] With the above technical solution, when the pressure sensors on both sides of the filter screen detect that the pressure difference on both sides of the filter screen reaches the set threshold and it is necessary to remove the impurities adhering to the filter screen, the one-way valves on the drain pipe and return water pipe are opened, and the drain pump and micro motor are started. The micro motor drives the scraper to rotate through the universal joint to remove the impurities adhering to the filter screen. The drain pump draws the water and impurities on the outside of the filter screen into the filter box. The impurities, scale, etc. are filtered and intercepted by the filter bag. The filtered water is then pumped back into the water supply pipe.

[0055] 3. Beneficial effects

[0056] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0057] 1. This utility model ensures smooth heating and convenient operation and maintenance through multi-stage filtration and automated impurity removal: the filter screen can intercept mud, rust, and scale crystals in the heating water, effectively preventing impurities from entering the ball valve, subsequent pipes, and radiators, avoiding flow channel blockage, reduced heat exchange efficiency, and lowering the failure rate of downstream equipment. The impurity cleaning mechanism is automatically triggered by differential pressure, requiring no manual intervention; mechanical scraping by scrapers, powerful suction by a drain pump, and three-stage filtration by the filter box result in a high impurity removal rate, and 100% of the filtered water is returned to the water supply pipe. The entire process requires no downtime, does not affect heating, extends the manual maintenance cycle, and reduces annual maintenance hours.

[0058] 2. High-efficiency heat insulation design protects drive components and ensures stable operation: The thermal isolation seat adopts a composite structure of "glass fiber phenolic resin + nano silica aerogel felt + air insulation cavity + aluminum foil reflective layer", which has a low thermal conductivity and can block the high temperature of the valve body, thus reducing the temperature of the cylinder working environment; the "stepped heat insulation sleeve + mica gasket" at the bolt completely eliminates metal thermal bridges, avoids the aging of cylinder seals and solenoid valve coils due to high temperature, ensures the long-term stable operation of the pneumatic drive system, and reduces the frequency of maintenance due to component aging.

[0059] 3. Water resource recycling and energy saving: The return water pipe of the impurity cleaning mechanism sends the filtered hot water back to the water supply pipe, eliminating water waste; the conical slag collection hopper and electrolytic polishing inner wall of the filter box reduce impurity deposition, and the filter bag can be repeatedly cleaned, reducing the cost of consumable replacement and meeting the requirements of energy saving and emission reduction. Attached Figure Description

[0060] Figure 1 This is an overall schematic diagram of a pneumatic control valve disclosed in a preferred embodiment of this application;

[0061] Figure 2 This is a schematic diagram of a ball valve, a pneumatic control valve, disclosed in a preferred embodiment of this application.

[0062] Figure 3 This is a schematic diagram of the valve cover of a pneumatic control valve disclosed in a preferred embodiment of this application;

[0063] Figure 4 This is a schematic diagram of the impurity cleaning mechanism of a pneumatic control valve disclosed in a preferred embodiment of this application.

[0064] Figure label:

[0065] 1. Valve body; 2. Valve cover; 3. Inlet pipe; 4. Outlet pipe; 5. Cylinder; 6. Pneumatic drive mechanism; 7. Ball valve; 8. Water supply pipe; 9. Impurity cleaning mechanism; 11. Hemispherical groove A; 12. Step groove; 21. Step protrusion; 22. Sealing block; 23. Water passage hole; 24. Hemispherical groove B; 31. Filter screen; 51. Air inlet pipe; 52. Square groove; 53. Thermal isolation seat; 61. Sliding sealing plug; 62. Toothed plate; 63. Gear; 64. Return spring; 71. Valve stem; 72. Water passage hole; 91. Micro motor; 92. Scraper; 93. Universal joint; 94. Drain pipe; 95. Return water pipe; 96. Drain pump; 97. Filter box; 98. Sealing door. Detailed Implementation

[0066] The present application will be further described in detail below with reference to the accompanying drawings.

[0067] Reference Figure 1 and Figure 2This application provides a pneumatic control valve suitable for heating and hot water pipes, including: valve body 1, valve cover 2, inlet pipe 3, outlet pipe 4, cylinder 5, pneumatic drive mechanism 6, ball valve 7, water supply pipe 8, and impurity cleaning mechanism 9.

[0068] The valve cover 2 is detachably fixed on the valve body 1;

[0069] The valve body 1 is fixedly equipped with an inlet pipe 3 and an outlet pipe 4 at both ends; flanges are fixedly installed on the outside of both the inlet pipe 3 and the outlet pipe 4; the inlet pipe 3, the outlet pipe 4 and the valve body 1 are made of 316 stainless steel.

[0070] The water inlet pipe 3 is detachably and fixedly connected to the water supply pipe 8 via a flange; both ends of the water supply pipe 8 are fixedly equipped with flanges; a filter screen 31 is detachably and fixedly installed at the water inlet of the water inlet pipe 3; the filter screen 31 adopts a double-layer composite structure, the outer layer is a ten-mesh stainless steel 304 coarse filter screen, which intercepts impurities with a diameter ≥1.5mm, such as mud, sand, and rust, and the inner layer is an eighty-mesh sintered screen (which intercepts fine particles with a diameter ≥0.2mm, such as scale crystals); the edge of the filter screen is embedded with a silicone rubber sealing ring, which is detachably connected to the water inlet pipe 3 by a buckle, making it convenient for regular deep cleaning.

[0071] The water supply pipe 8 is equipped with an impurity cleaning mechanism 9; the impurity cleaning mechanism 9 can be used to scrape off impurities from the filter screen 31 and filter the impurities.

[0072] A ball valve 7 is rotatably mounted between the valve body 1 and the valve cover 2. A valve stem 71 is detachably fixed on the ball valve 7. A water passage hole 72 is provided on the ball valve 7. The ball valve 7 is forged from 316 stainless steel. The water passage hole 72 is eccentrically designed (eccentricity distance is 5 mm). When opened, the water flow forms a reverse flush on the valve seat, reducing the adhesion of impurities. The sealing surface is made of Stellite alloy overlay welding, which is wear-resistant and adaptable to the temperature fluctuation of heating hot water.

[0073] A cylinder 5 is fixedly installed on the upper end of the valve cover 2, and a pneumatic drive mechanism 6 is installed inside the cylinder 5;

[0074] The pneumatic drive mechanism 6 is connected to the valve stem 71. The pneumatic drive mechanism 6 can drive the ball valve 7 to rotate through the valve stem 71, thereby opening the valve to supply water or closing the valve to stop supplying water.

[0075] In this technical solution, valve body 1, inlet pipe 3, outlet pipe 4, and delivery pipe 8 are connected to the heating hot water pipe. The pneumatic drive mechanism 6 can drive the ball valve 7 to rotate via valve stem 71, thus opening the valve to supply water or closing it to stop supplying water. During normal operation, the pneumatic drive mechanism 6 drives the ball valve 7 to the fully open position, and the heating hot water is delivered through the delivery pipe 8, filter screen 31, valve body 1, and outlet pipe 4. At this time, the impurity cleaning mechanism 9 is in standby mode, and the magnetic plate continuously attracts ferromagnetic impurities. The filter screen 31 intercepts and filters impurities in the heating water; the impurity cleaning mechanism 9 scrapes away impurities from the filter screen 31 and filters them. The flanges of the inlet pipe 3, outlet pipe 4, and delivery pipe 8 all adopt the PN16 pressure rating (suitable for DN50-DN200 pipes), with a raised face sealing surface design, and are equipped with 120℃ resistant nitrile rubber gaskets. The bolts are made of 8.8 grade high-strength carbon steel (galvanized surface) to ensure a tight connection. The water supply pipe 8 is made of 316 stainless steel, and a check valve is installed at the flange connecting it to the inlet pipe 3 to prevent water from flowing back and impacting the filter screen when cleaning impurities. A pressure test interface is reserved in the pipe body for convenient periodic pressure testing. When the pressure difference across the filter screen exceeds the standard, the impurity cleaning mechanism 9 scrapes impurities off the filter screen 31.

[0076] Reference Figure 2 and Figure 3 The valve body 1 is provided with a stepped groove 12, and a hemispherical groove A11 is provided on the inner side of the stepped groove 12; the valve body 1 is provided with a circular hole that communicates with the water inlet pipe 3 and the water outlet pipe 4, and the diameter of the circular hole is the same as the inner diameter of the water inlet pipe 3 and the water outlet pipe 4; the stepped groove 12 adopts a two-stage stepped design.

[0077] A stepped protrusion 21 is fixedly provided on the valve cover 2, and a sealing block 22 is fixedly provided on the stepped protrusion 21. A hemispherical groove B24 is provided on the sealing block 22. The valve cover 2 is made of 316 stainless steel.

[0078] The hemispherical groove B24 and the hemispherical groove A11 are engaged together to limit the movement of the ball valve 7, allowing the ball valve 7 to rotate within the hemispherical groove B24 and the hemispherical groove A11.

[0079] A water passage hole 23 is provided on the sealing block 22, and the water passage hole 23 penetrates the sealing block 22.

[0080] The diameter of the water passage 23 is the same as the inner diameter of the water inlet pipe 3 and the water outlet pipe 4.

[0081] Three density ring grooves are provided on the stepped protrusion 21, and rubber elastic sealing rings are provided in each density ring groove to improve the sealing performance of the connection between the valve cover 2 and the valve body 1.

[0082] Three annular grooves are arranged axially on the stepped protrusion 21, with a cross-section consisting of a combination of trapezoidal and rectangular shapes.

[0083] The first, outermost layer: trapezoidal groove with a built-in D-shaped fluororubber sealing ring (hardness 75 Shore A). The lip faces the outside of the valve body, which can block the intrusion of external dust and moisture (temperature resistance -20℃~200℃).

[0084] The second layer, in the middle: a rectangular groove with a built-in O-ring nitrile rubber seal, is the main seal for heating hot water.

[0085] The third, innermost layer: a rectangular groove with a built-in polyurethane U-shaped sealing ring. The lip faces inward to the valve body, forming a reverse seal. When the internal water pressure fluctuates, the U-shaped lip will press tightly against the cover as the pressure increases, enhancing the sealing effect.

[0086] The edge of the hemispherical groove B24 is embedded with a polytetrafluoroethylene guide ring, which not only provides lubrication for the rotation of the ball valve, but also prevents small impurities from entering the groove. The inner side of the polytetrafluoroethylene guide ring is equipped with a miniature oil reservoir filled with high-temperature grease, which is resistant to 120°C and reduces dry friction wear.

[0087] The valve cover 2 and valve body 1 are sealed by bolt connection: the valve cover 2 and valve body 1 are fastened by high-strength bolts, and anti-loosening washers (made of spring steel) are provided on the bolt heads to prevent the bolts from loosening due to vibration of the heating system.

[0088] In this technical solution, the stepped protrusion 21 and the groove 12 are designed with two-stage steps, with a surface roughness Ra≤1.6μm to reduce assembly friction. The end face of the step is chamfered at 0.5×45° to facilitate smooth insertion into the groove during assembly. The hemispherical groove B24 and hemispherical groove A11 combine to form a complete spherical cavity, with an inner diameter 0.2-0.3mm larger than the outer diameter of the ball valve 7. The cavity surface is mirror polished with Ra≤0.8μm to reduce the coefficient of friction when the ball valve rotates and ensure stable switching torque.

[0089] Furthermore, an air inlet pipe 51 is fixedly installed on the cylinder 5, and a square groove 52 is formed on the cylinder 5; a plug plate is detachably fixed at the end of the square groove 52. A solenoid valve is fixedly installed on the air inlet pipe 51; the air inlet pipe 51 is made of stainless steel corrugated pipe (304 material, pressure resistant 2.5MPa), and both ends are connected to the cylinder 5 and the air source pipeline through compression fittings; the pipe body is covered with a fiberglass heat insulation sleeve to reduce gas expansion fluctuations caused by heat conduction from the valve body to the air source pipeline. The solenoid valve is a two-position five-way pilot-operated solenoid valve; the coil protection level is IP65 (water-proof), suitable for the humid environment of the heating machine room; a built-in manual emergency button allows manual switching of the valve position in case of air source failure, ensuring basic control functions.

[0090] A thermal isolation seat 53 is detachably fixed between the cylinder 5 and the valve cover 2 by countersunk bolts;

[0091] The pneumatic drive mechanism 6 includes a sliding sealing plug 61, a toothed plate 62, a gear 63, and a return spring 64;

[0092] A sliding sealing plug 61 is provided inside the cylinder 5 for sealing and sliding.

[0093] A toothed plate 62 is fixedly installed on the sliding sealing plug 61; the toothed plate 62 is slidably installed in the square groove 52; the sliding sealing plug 61 is forged from aluminum alloy (6061-T6) and has combined sealing components embedded at both ends; the combined sealing components include a polyurethane U-ring and a polytetrafluoroethylene guide ring, with the polyurethane U-ring as the main seal and the polytetrafluoroethylene guide ring as the auxiliary guide, ensuring that there is no uneven wear and no gas leakage when sliding in the circular groove.

[0094] A return spring 64 is provided inside the square groove 52, and one end of the return spring 64 is fixedly connected to the toothed plate 62.

[0095] A gear 63 is rotatably installed inside the cylinder 5; the gear 63 meshes with the toothed plate 62 for transmission.

[0096] A circular groove is provided inside the cylinder 5, and the sliding sealing plug 61 is slidably disposed within the circular groove. An angle sensor is fixedly mounted on the gear 63 to monitor the rotation angle of the ball valve 7. The angle sensor is a non-contact magnetoresistive angle sensor, connected to the extension shaft of the gear 63 via a flexible coupling to ensure synchronous rotation between the sensor and the gear; the signal output is a 4.0-20.0mA analog signal, which can be directly connected to the PLC control system to provide real-time feedback on the opening degree of the ball valve 7. The circular groove is precision honed, and its inner diameter is 0.05-0.08mm larger than that of the sliding sealing plug 61, forming a sealing basis for the mating clearance; the groove wall is hard anodized to accommodate the high-frequency reciprocating motion of the sliding sealing plug.

[0097] In this technical solution, compressed gas is injected into the circular groove of cylinder 5 through intake pipe 51, which pushes the sliding sealing plug 61 to move. The sliding sealing plug 61 drives the toothed plate 62 to move, and the toothed plate 62 drives the gear 63 to rotate, so that the ball valve 7 opens or closes.

[0098] Furthermore, the thermal insulation seat 53 consists of, from bottom to top: a five-millimeter glass fiber reinforced phenolic resin layer, a nano-silica aerogel felt (ten millimeters thick), and a two-millimeter glass fiber reinforced phenolic resin layer.

[0099] Five-millimeter glass fiber reinforced phenolic resin layer: resists direct impact from high temperature of valve body; provides structural support and withstands assembly preload; reduces infrared heat radiation absorption;

[0100] Nano-silica aerogel felt: blocks more than 90% of conductive heat; built-in air insulation cavity and reflective layer to enhance radiative / convection insulation;

[0101] Two-millimeter glass fiber reinforced phenolic resin layer; protects the core aerogel felt from cylinder side moisture / dust corrosion; ensures assembly sealing.

[0102] In the middle of the nano-silica aerogel felt layer, a ring-shaped air insulation cavity is opened along the center of the isolation seat, and an aluminum foil reflective layer and supporting ribs are set inside the cavity;

[0103] Aluminum foil reflective layer: A 0.05mm thick high-purity aluminum foil is bonded to the upper and lower walls of the air cavity with a high-temperature resistant adhesive. The surface finish of the aluminum foil Ra≤0.1μm and the reflectivity to infrared radiation ≥95% can block the radiative heat transfer from the valve body to the cylinder.

[0104] Support ribs: Four cross-shaped support ribs are evenly distributed along the circumference inside the air cavity to prevent the air cavity from collapsing due to assembly pressure, while not affecting the static heat insulation effect of the air.

[0105] A fully enclosed heat insulation component is installed at the countersunk bolt mounting hole between cylinder 5 and valve cover 2. The fully enclosed heat insulation component specifically includes:

[0106] Stepped composite thermal insulation sleeve: Embedded in bolt holes, it has a three-section cylindrical structure: The middle section is made of polytetrafluoroethylene (PTFE) with a thermal conductivity of 0.25 W / (m・K), and the inner wall is polished. The gap between the thermal insulation sleeve and the bolt rod is 0.1-0.2 mm to prevent direct contact between the bolt rod and the insulating seat; the two ends are made of glass fiber reinforced polyimide (containing 40% glass fiber) to prevent the thermal insulation sleeve from being crushed when the bolts are tightened; the fit between the thermal insulation sleeve and the bolt holes is an interference fit with no gaps, further reducing heat penetration.

[0107] Mica thermal insulation gasket: It is a thin, circular sheet placed between the head of the countersunk bolt and the bottom of the countersunk hole of the isolation seat; the material is phlogopite, which is heat resistant to 600℃ and has a thermal conductivity of 0.1W / (m・K). The surface is coated to completely block the metal contact between the bolt head and the surface of the isolation seat, eliminating the last thermal bridge.

[0108] In this technical solution, the thermal insulation seat 53 serves as a heat insulation element.

[0109] Reference Figure 2 and Figure 4 The impurity cleaning mechanism 9 includes a micro motor 91, a scraper 92, a universal joint 93, a drain pipe 94, a return water pipe 95, a drain pump 96, a filter box 97, and a sealing door 98.

[0110] A micro motor 91 is fixedly installed at one end of the water supply pipe 8; a universal joint 93 is installed on the water supply pipe 8 in a sealable and rotatable manner; the micro motor 91 is a high-temperature resistant DC geared motor; the motor housing is IP68 protected to prevent water vapor from seeping into the water supply pipe 8 and causing a short circuit; it is rigidly connected to the outer wall of the water supply pipe 8 by an L-shaped stainless steel bracket, and a thick silicone rubber heat insulation pad is installed between the bracket and the water pipe to block the heat conduction of the water pipe to the motor.

[0111] The scraper 92 adopts a composite structure of polyurethane scraper strips and a stainless steel frame: the scraper strips are made of 60 Shore A hardness polyurethane with a wedge-shaped cross-section to ensure a good fit with the filter screen 31; the frame is made of 304 stainless steel and is embedded inside the scraper strips to form support and prevent the scraper strips from deforming due to water flow impact. The scraper 92 is divided into three groups along the radial direction of the filter screen 31, and the length of each group of scraper strips matches the radius of the filter screen. The edges of the scraper strips are rounded by 0.3mm to ensure the scraping effect while avoiding scratching the filter screen.

[0112] A scraper 92 is rotatably provided at one end of the water supply pipe 8, and the scraper 92 rubs against the filter screen 31.

[0113] One end of the universal joint 93 is coaxially and fixedly connected to the output end of the micro motor 91; the other end of the universal joint 93 is fixedly connected to the scraper 92. The micro motor 91 can drive the scraper 92 to rotate through the universal joint 93, thereby removing impurities adhering to the filter screen 31. Pressure sensors are provided on both sides of the filter screen 31.

[0114] Universal joint 93 adopts a cross-type universal joint (made of 304 stainless steel). Both ends of the universal joint are connected to the motor output shaft and scraper shaft respectively via flat keys to ensure synchronous rotation. A double-lip mechanical seal is installed at the penetration point between the universal joint and the water supply pipe 8; the inner side is a polytetrafluoroethylene moving ring that rotates with the universal joint, and the outer side is a silicon carbide stationary ring that is fixed to the water pipe wall. The surface roughness of the two contact surfaces Ra≤0.05μm, and the sealing medium is high-temperature lubricating grease to ensure no leakage under a water pressure of 0.6MPa.

[0115] Drain pipe 94 and return pipe 95 are fixedly installed at the lower ends of the water supply pipe 8, respectively; both drain pipe 94 and return pipe 95 are equipped with check valves. The check valves are spring-loaded check valves (DN32) with brass valve bodies and fluororubber seals.

[0116] A filter box 97 is fixedly installed below the drain pipe 94, and a filter bag is detachably installed inside the filter box 97. A drain pump 96 is fixedly installed above the filter box 97, and the output end of the drain pump 96 is connected to the water supply pipe 8. A sealing door 98 is rotatably installed on the filter box 97. The drain pump 96 is a stainless steel centrifugal pump (304 material impeller and pump casing). The pump inlet is connected to the top of the filter box 97 through a bellows pipe, and the outlet is connected to the water supply pipe 8 through a check valve to prevent water backflow when the machine stops. A pressure gauge is installed on the pipeline to monitor the suction pressure in real time. The filter box 97 is made of 304 stainless steel plate welded together, and has a conical slag collection hopper inside with a bottom inclined at five degrees to guide impurities to concentrate towards the filter bag; the inner wall of the box is electrolytically polished to reduce impurity adhesion. The filter bag adopts a three-layer composite structure; the outer layer is a ten-mesh stainless steel mesh, the middle layer is an eighty-mesh nylon mesh (intercepting particles ≥0.2mm, such as iron filings), and the inner layer is an ultra-fine non-woven fabric (intercepting fine impurities ≥0.05mm, such as scale powder); the top of the filter bag is equipped with an elastic retaining ring that cooperates with the retaining groove on the inside of the housing, allowing for repeated washing and use.

[0117] A diffused silicon pressure sensor is installed on both the upstream and downstream sides of filter screen 31 to monitor the pressure difference in real time; when the pressure difference is ≥0.1MPa (which can be set by PLC), the cleaning program is triggered.

[0118] First, open the check valves on drain pipe 94 and return pipe 95;

[0119] Delay the start of the drain pump 96 by 1.0s (to avoid instantaneous negative pressure);

[0120] Simultaneously start the micro motor 91 to drive the scraper 92 to rotate, alternating between forward and reverse, rotating three times each time to ensure thorough cleaning;

[0121] When the pressure difference drops to ≤0.03MPa, first stop the motor, then stop the pump, and finally close the check valve. This will not affect the water supply from the main pipeline.

[0122] The sealing door 98 uses a 5mm thick tempered glass door panel for easy observation of the filter bag status, and is surrounded by a 2mm thick silicone rubber sealing ring to ensure a tight seal. The sealing door 98 adopts an eccentric shaft and latch quick-opening structure, with two stainless steel latches on one side for convenient and quick filter bag replacement; a magnetic limit switch is installed on the door panel, and the cleaning program cannot start when the door is not closed tightly.

[0123] The micro motor 91, universal joint 93, drainage pump 96, pressure sensor and angle sensor are all existing technologies, and are only borrowed in this application, and will not be described in detail here.

[0124] In this technical solution, when the pressure sensors on both sides of the filter screen 31 detect that the pressure difference on both sides of the filter screen 31 reaches a set threshold, indicating that impurities adhering to the filter screen 31 need to be removed, the one-way valves on the drain pipe 94 and the return water pipe 95 are opened, and the drain pump 96 and the micro motor 91 are started. The micro motor 91 drives the scraper 92 to rotate through the universal joint 93, removing the impurities adhering to the filter screen 31. The drain pump 96 draws water and impurities from the outside of the filter screen 31 into the filter box 97, where the impurities and scale are filtered and intercepted by the filter bag. The filtered water is then pumped back into the water supply pipe 8. Through mechanical scraping by the scraper, powerful suction by the pump, and a three-stage filtration combination, the removal rate of typical impurities in the heating system, such as iron filings and scale, is ≥98%, significantly reducing the frequency of filter screen clogging. This achieves fully automated, zero-downtime, and high-reuse impurity cleaning, perfectly adapting to the continuous operation requirements of heating pipelines, while significantly reducing manual maintenance costs.

[0125] The working principle of this pneumatic control valve is as follows: The valve body 1, inlet pipe 3, outlet pipe 4, and supply pipe 8 are connected to the heating hot water pipe. The pneumatic drive mechanism 6 can drive the ball valve 7 to rotate via the valve stem 71, thus opening the valve to supply water or closing the valve to stop supplying water. During normal operation, the pneumatic drive mechanism 6 drives the ball valve 7 to the fully open position, and the heating hot water is transported through the supply pipe 8, filter screen 31, valve body 1, and outlet pipe 4. At this time, the impurity cleaning mechanism 9 is in standby mode, and the magnetic plate continuously attracts ferromagnetic impurities. The filter screen 31 intercepts and filters impurities in the heating water; the impurity cleaning mechanism 9 scrapes away impurities from the filter screen 31, thus filtering the impurities. When the pressure difference across the filter screen exceeds the standard, the impurity cleaning mechanism 9 scrapes away impurities from the filter screen 31.

[0126] This invention ensures smooth heating and convenient operation and maintenance through multi-stage filtration and automated impurity removal: the filter screen 31 can intercept mud, rust, and scale crystals in the heating water, effectively preventing impurities from entering the ball valve 7, subsequent pipes, and radiators, avoiding flow channel blockage, reduced heat exchange efficiency, and lowering the failure rate of downstream equipment. The impurity cleaning mechanism 9 is automatically triggered by differential pressure, requiring no manual intervention; the three-stage filtration of mechanical scraping by scrapers, powerful suction by the drain pump 96, and filtration by the filter box 97 results in a high impurity removal rate, and 100% of the filtered water is returned to the water supply pipe 8 (no water waste). The entire process requires no downtime, does not affect heating, extends the manual maintenance cycle, and reduces annual maintenance hours. High-efficiency heat insulation design protects drive components and ensures stable operation: The thermal isolation seat 53 adopts a composite structure of "glass fiber phenolic resin + nano silica aerogel felt + air insulation cavity + aluminum foil reflective layer", which has a low thermal conductivity and can block the valve body from high temperature of 95℃, so that the working environment temperature of cylinder 5 is ≤50℃; the stepped heat insulation sleeve and mica gasket at the bolt completely eliminate metal thermal bridges, avoid cylinder seals and solenoid valve coils from aging due to high temperature, ensure long-term stable operation of the pneumatic drive system, and reduce the frequency of maintenance due to component aging. Water resource recycling saves energy and reduces consumption: The return water pipe 95 of the impurity cleaning mechanism 9 sends the filtered hot water back to the supply water pipe 8, eliminating water waste; the conical slag collection hopper and electrolytically polished inner wall of the filter box 97 reduce impurity deposition, and the filter bag can be repeatedly washed, reducing the cost of consumable replacement and meeting the requirements of energy conservation and emission reduction.

[0127] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pneumatically controlled valve, comprising a valve body, a valve cover, an inlet pipe, an outlet pipe, a cylinder, a pneumatic drive mechanism, a ball valve, a water delivery pipe, and a debris removal mechanism, characterized in that: The valve cover is detachably fixed to the valve body; an inlet pipe and an outlet pipe are fixedly installed at both ends of the valve body; the inlet pipe, valve cover, outlet pipe and valve body are made of 316 stainless steel. The water inlet pipe is detachably and fixedly connected to the water supply pipe via a flange; a filter screen is detachably and fixedly installed at the water inlet of the water inlet pipe; an impurity cleaning mechanism is installed on the water supply pipe; the impurity cleaning mechanism scrapes away impurities from the filter screen and filters the impurities. A ball valve is rotatably mounted between the valve body and the valve cover, and a valve stem is detachably and fixedly mounted on the ball valve; a water passage hole is opened on the ball valve; a cylinder is fixedly mounted on the upper end of the valve cover, and a pneumatic drive mechanism is installed inside the cylinder; The pneumatic drive mechanism is connected to the valve stem drive. The pneumatic drive mechanism can drive the ball valve to rotate through the valve stem, so as to open the valve to supply water or close the valve to stop supplying water.

2. The pneumatic control valve according to claim 1, characterized in that: An air intake pipe is fixedly installed on the cylinder, and a square slot is opened on the cylinder; a solenoid valve is fixedly installed on the air intake pipe. A thermal isolation seat is detachably fixed between the cylinder and the valve cover; The pneumatic drive mechanism includes a sliding sealing plug, a toothed plate, a gear, and a return spring; A sliding sealing plug is provided inside the cylinder; a toothed plate is fixedly provided on the sliding sealing plug; the toothed plate is slidably provided in a square groove; a return spring is provided in the square groove. A gear is rotatably installed inside the cylinder; the gear meshes with a gear plate for transmission; a circular groove is provided inside the cylinder, and a sliding sealing plug is installed in the circular groove to seal the movement.

3. The pneumatic control valve according to claim 2, characterized in that: An angle sensor is fixedly installed on the gear to monitor the rotation angle of the ball valve.

4. The pneumatic control valve of claim 2, wherein: The thermal insulation base consists of, from bottom to top: a 5 mm glass fiber reinforced phenolic resin layer, a nano silica aerogel felt, and a 2 mm glass fiber reinforced phenolic resin layer.

5. The pneumatic control valve according to claim 4, characterized in that: In the middle of the nano-silica aerogel felt layer, a ring-shaped air insulation cavity is opened along the center of the isolation seat, and an aluminum foil reflective layer and supporting ribs are set inside the cavity; A fully enclosed heat insulation component is installed at the countersunk bolt mounting hole between the cylinder and the valve cover. The fully enclosed heat insulation component specifically includes: a stepped composite heat insulation sleeve and a mica heat insulation gasket.

6. The pneumatic control valve of claim 1, wherein: The impurity cleaning mechanism includes a micro motor, scraper, universal joint, drain pipe, return water pipe, drain pump, filter box, and sealing door; A micro motor is fixedly installed at one end of the water supply pipe; a universal joint is installed on the water supply pipe in a sealed and rotatable manner. A scraper is rotatably installed at one end of the water supply pipe, and the scraper rubs against the filter screen. One end of the universal joint is coaxially and fixedly connected to the output end of the micro motor; the other end of the universal joint is fixedly connected to the scraper. A drain pipe and a return pipe are fixedly installed at the bottom of each end of the water supply pipe; a one-way valve is installed on both the drain pipe and the return pipe. A filter box is fixedly installed below the drain pipe, and a filter bag is detachably installed inside the filter box; a drain pump is fixedly installed above the filter box, and the output end of the drain pump is connected to the water supply pipe; a rotatable sealing door is installed on the filter box.

7. The pneumatic control valve of claim 6, wherein: The scraper adopts a composite structure of polyurethane scraper strips and stainless steel skeleton; the scraper is divided into three groups along the radial direction of the filter screen.

8. The pneumatic control valve of claim 6, wherein: A diffused silicon pressure sensor is installed on both the upstream and downstream sides of the filter screen to monitor the pressure difference in real time.

9. The pneumatic control valve of claim 1, wherein: The valve body is provided with a stepped groove, and a hemispherical groove A is provided on the inner side of the stepped groove; the valve body is provided with a round hole that communicates with the inlet pipe and the outlet pipe; a stepped protrusion is fixedly provided on the valve cover, and a sealing block is fixedly provided on the stepped protrusion, and a hemispherical groove B is provided on the sealing block; the hemispherical groove B and the hemispherical groove A are engaged together to limit the ball valve; so that the ball valve can rotate within the hemispherical groove B and the hemispherical groove A. The sealing block has a water passage hole that passes through it; the stepped protrusion has three density ring grooves, each containing a rubber elastic sealing ring to improve the sealing performance of the valve cover and valve body connection.

10. The pneumatic control valve of claim 9, wherein: Three annular grooves are arranged axially on the stepped protrusion, with a cross-section consisting of a combination of trapezoidal and rectangular shapes. The first step: a trapezoidal groove with a built-in D-shaped fluororubber sealing ring, with the lip facing the outside of the valve body, to prevent external dust and moisture from entering; The second layer: a rectangular groove with a built-in O-ring nitrile rubber seal, mainly for sealing the heating hot water supply; The third layer: a rectangular groove with a built-in polyurethane U-shaped sealing ring, with the lip facing the inside of the valve body to form a reverse seal; when the internal water pressure fluctuates, the U-shaped lip will press tightly against the cover as the pressure increases, enhancing the sealing effect; a polytetrafluoroethylene guide ring is embedded at the edge of the hemispherical groove B.

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