A close-packed carbon dioxide pipeline anti-freezing pressure reducing valve with uniform heating

Abstract

The application provides a uniform heating dense-phase carbon dioxide pipeline anti-freezing pressure reducing valve, and relates to the field of dense-phase carbon dioxide pipeline pressure reducing valves.The valve main shell is fixedly connected with an outlet butt joint pipe on the side, a sealing base is fixedly connected to the bottom surface of the valve main shell, a valve auxiliary shell is fixedly connected to the upper surface of the valve main shell, and an anti-blocking mechanism is arranged in the valve main shell.The anti-blocking mechanism comprises a valve port and an annular track.The uniform heating dense-phase carbon dioxide pipeline anti-freezing pressure reducing valve can drive the rotating pipe to rotate through the three sliding blocks of the rotating rod, and then the three rubbing plates rotate to rub the frozen dry ice on the inner wall of the valve port, so that the frozen dry ice is broken and falls to prevent it from being further frozen into larger ice blocks, thereby effectively avoiding the problem that the valve port area in the pressure reducing valve is frozen into dry ice to cause the pressure reducing valve to be blocked.

Description

Technical Field

[0001] This invention relates to an antifreeze pressure reducing valve, specifically an antifreeze pressure reducing valve for dense phase carbon dioxide pipelines with uniform heating around the perimeter, belonging to the technical field of pressure reducing valves for dense phase carbon dioxide pipelines. Background Technology

[0002] Dense-phase carbon dioxide is a special state of carbon dioxide, existing between the gaseous and liquid phases. It exists under operating pressures above 7.38 MPa and operating temperatures below 31.1 degrees Celsius. In this state, carbon dioxide cannot be described by sensory perception because it is neither a typical gas nor a liquid, but exists as a fourth phase. Dense-phase carbon dioxide transport pipelines are similar to conventional hydrocarbon pipelines. Carbon dioxide pipelines require pressure-reducing valves at the points along the route. These valves reduce the inlet pressure to a desired outlet pressure through regulation, and rely on the energy of the dense-phase carbon dioxide medium itself to automatically maintain a stable outlet pressure.

[0003] A search revealed a carbon dioxide supply system disclosed in patent number CN114165726A. This system features remotely adjustable output carbon dioxide gas pressure. However, when dense phase carbon dioxide is depressurized through a pressure reducing valve, the pressure decreases at the valve orifice. This depressurization process causes the temperature at the valve orifice area to drop below zero degrees Celsius, leading to dry ice formation. This solid dry ice causes blockage in the pressure reducing valve, making it difficult to maintain stable outlet pressure. Therefore, we provide a dense phase carbon dioxide pipeline anti-freeze pressure reducing valve with circumferentially uniform heating to solve these problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to provide a dense-phase carbon dioxide pipeline antifreeze pressure reducing valve with uniform heating around the perimeter to solve the problem of dry ice formation in the valve port area of ​​the pressure reducing valve causing blockage in the prior art.

[0006] (II) Technical Solution

[0007] This invention is achieved through the following technical solution: a dense phase carbon dioxide pipeline antifreeze pressure reducing valve with uniform heating around the perimeter, comprising a valve main body, an outlet connecting pipe fixedly connected to the side of the valve main body, a sealing base fixedly connected to the bottom surface of the valve main body, a valve secondary body fixedly connected to the upper surface of the valve main body, an anti-blocking mechanism provided inside the valve main body, the anti-blocking mechanism comprising a valve port and an annular track, the valve port penetrating through the inner wall of the valve main body and fixedly connected to the valve main body, a pressure reducing valve disc adapted to the valve port fixedly connected to the bottom end of the movable main rod, and a linkage mechanism provided inside the valve main body, the linkage mechanism comprising a movable plate, two fixed rods fixedly connected to the outer surface of the movable plate.

[0008] Preferably, a heating wire is sleeved on the outer surface of the main valve housing, and the heating wire is fixedly connected to the outer surface of the main valve housing. An inlet connecting pipe is fixedly connected to the side of the secondary valve housing, and a fixed sleeve is fixedly connected to the upper surface of the secondary valve housing. A connecting pipe is fixedly connected between the upper end of the secondary valve housing and the outlet connecting pipe. A movable main rod is provided inside the main valve housing. The main valve housing, the secondary valve housing, and the fixed sleeve are all sleeved on the outside of the movable main rod. A sealing slider is fixedly connected to the middle of the movable main rod. A first sealing ring and a second sealing ring adapted to the sealing slider are fixedly connected to the inner wall of the secondary valve housing. The inlet and outlet pipes are connected. The pressure of the dense phase carbon dioxide in the outlet of the outlet pipe will pressurize the sealing slider in the valve sub-body through the connecting pipe. If the pressure of the dense phase carbon dioxide pressing the sealing slider is greater than the spring tension of the pair of pressure-bearing lifting plates of the telescopic spring, the pressure generated by the dense phase carbon dioxide in the outlet of the outlet pipe will push the sealing slider to move the movable main rod downward. When the movable main rod moves downward, it will drive the pressure-reducing valve disc to move downward, thereby creating a gap between the pressure-reducing valve disc and the valve port. The greater the pressure of the dense phase carbon dioxide in the outlet of the outlet pipe relative to the spring tension of the pair of pressure-bearing lifting plates of the telescopic spring, the larger the gap between the pressure-reducing valve disc and the valve port will be.

[0009] Preferably, the fixed sleeve is provided with a pressure regulating mechanism, which includes a threaded rod. A threaded tube is provided above the fixed sleeve, penetrating the outer surface of the fixed sleeve and fixedly connected to it. The threaded tube is threadedly connected to the threaded rod. A pressing plate is fixedly connected to the bottom end of the threaded rod. A pressure lifting plate is rotatably connected to the top end of the movable main rod. The pressure lifting plate is slidably connected to the inner wall of the fixed sleeve. A telescopic spring is fixedly connected between the pressure lifting plate and the pressing plate. By setting up the pressure regulating mechanism, when it is necessary to adjust the resistance force of the pressure lifting plate against the pressure of the dense phase carbon dioxide medium, the pressing plate is moved up or down by rotating the threaded rod, changing the spring pressure of the telescopic spring against the pressure lifting plate, thereby adjusting the resistance force of the pressure lifting plate against the pressure of the dense phase carbon dioxide medium.

[0010] Preferably, a rotating rod is rotatably connected to the bottom surface of the pressure reducing valve disc, a rotating tube is slidably connected to the outer surface of the rotating rod, three sliding blocks are fixedly connected to the inner wall of the rotating tube, and three sliding grooves adapted to the sliding blocks are opened on the outer surface of the rotating rod. The three sliding blocks are slidably connected to the inner walls of the three sliding grooves respectively. Through the sliding connection between the three sliding blocks and the three sliding grooves respectively, the rotating rod can drive the rotating tube to rotate through the three sliding blocks and the three sliding grooves when rotating, without affecting the sliding of the rotating tube on the rotating rod.

[0011] Preferably, three connecting rods are fixedly connected to the outer surface of the rotating tube, and a fixing plate is fixedly connected to the outer surface of each of the three connecting rods. A rotating slip ring is provided above the rotating tube, and the three fixing plates are fixedly connected to the upper surface of the rotating slip ring. The rotating slip ring is rotatably connected to the inner wall of the annular track. The stability of the three fixing plates is increased by sliding the rotating slip ring to the inner wall of the annular track.

[0012] Preferably, a limiting plate is fixedly connected to the outer surface of the fixed plate, a limiting square rod is fixedly connected to the outer surface of the limiting plate, a scraping plate is slidably connected to the outer surface of the limiting square rod, the scraping plate is adapted to the valve port, a guide ring block adapted to the scraping plate is fixedly connected to the bottom surface of the valve port, and a telescopic spring three is sleeved on the outer surface of the limiting square rod. The telescopic spring three is fixedly connected between the scraping plate and the limiting plate. When the three scraping plates move upward, they are squeezed into the valve port by the guide ring block, and the spring pressure of the three telescopic spring three makes the three scraping plates fit against the inner wall of the valve port respectively. The setting of the telescopic spring three makes the scraping plates fit against the inner wall of the valve port by the spring pressure of the telescopic spring three.

[0013] Preferably, rotating plates are provided on both sides of the movable plate, and the outer surfaces of the two rotating plates are provided with sliding grooves that are adapted to the fixed rods. The two fixed rods are slidably connected to the two sliding grooves respectively. When the movable plate moves downward under pressure, the movable plate drives the two fixed rods to squeeze the two sliding grooves respectively, causing the ends of the two rotating plates that are close to each other to flip downward. Similarly, when the movable plate moves upward under pressure, the ends of the two rotating plates that are close to each other to flip upward.

[0014] Preferably, a motor is fixedly connected to the bottom surface of the sealing base, and a rotating column is fixedly connected to the output end of the motor. The rotating column passes through the outer surface of the sealing base and is rotatably connected to the sealing base. A square rod is fixedly connected to one end of the rotating column. The square rod is slidably connected to the rotating rod. The motor is controlled to drive the square rod to rotate, and the rotation of the square rod drives the rotating rod to rotate. This causes the rotating rod to drive the rotating tube to rotate through three sliding blocks, which in turn causes the three scraping plates to rotate and scrape the frozen dry ice attached to the inner wall of the valve port, causing the frozen dry ice to break and fall off, preventing it from continuing to form larger ice blocks.

[0015] Preferably, two support frames are fixedly connected to the upper surface of the sealing base, and the two support frames are rotatably connected to the two rotating plates respectively. Two fixed rods are fixedly connected to the bottom surface of the annular track. Two sliding grooves are opened on the outer surface of the two rotating plates, and the two sliding grooves are slidably connected to the two fixed rods respectively. When the movable plate moves downward under pressure, the movable plate drives the two fixed rods to squeeze the two sliding grooves respectively, causing the ends of the two rotating plates that are close to each other to flip downward, so that the ends of the two rotating plates that are far apart from each other flip upward and press against the two fixed rods to move upward. Similarly, when the movable plate moves upward under pressure, the ends of the two rotating plates that are far apart from each other flip downward and pull the two fixed rods downward respectively.

[0016] Preferably, the movable plate is sleeved outside the rotating rod, and four limiting rods are fixedly connected to the outer surface of the sealing base. All four limiting rods are slidably connected to the movable plate. A second telescopic spring is fixedly connected between the movable plate and the sealing base. A pressing block is rotatably connected to the outside of the rotating rod. The pressing block is located above the movable plate. The setting of the four limiting rods increases the stability of the limiting rods when they move up and down, and prevents the movable plate from shifting when it moves. With the setting of the second telescopic spring, when the upper surface of the movable plate is not under pressure, the movable plate is lifted upward by the spring pressure of the second telescopic spring.

[0017] This invention provides a dense-phase carbon dioxide pipeline antifreeze pressure reducing valve with uniform heating around the perimeter, which has the following beneficial effects:

[0018] 1. This invention, through the configuration of a linkage mechanism and an anti-blocking mechanism, ensures that when the pressure inside the outlet connecting pipe is less than the spring pressure of the first telescopic spring, the sealing slider will be driven by the pressure change to move the movable main rod downwards. The movable main rod will then drive the pressure-reducing valve disc downwards, separating it from the valve port. At this time, the pressure-reducing valve disc will drive the pressing block on the rotating rod to press the movable plate, causing the movable plate to move downwards and press down on the two rotating plates on both sides. This will cause the two rotating plates on both sides to lift the two fixed rods. The two fixed rods will then drive the rotating slip ring on the annular track to move upwards. The upward movement of the rotating slip ring will then drive the three fixed plates... As the scraping plates move upwards, they are pressed into the valve opening by the guide ring block. The spring pressure of the three telescopic springs causes the three scraping plates to adhere to the inner wall of the valve opening. The motor drives the square rod to rotate, which in turn drives the rotating rod to rotate. This rotating rod, through the three sliding blocks, drives the rotating tube to rotate, causing the three scraping plates to rotate and scrape the frozen dry ice adhering to the inner wall of the valve opening. This breaks the frozen dry ice and prevents it from freezing into larger ice blocks, effectively avoiding the problem of dry ice forming in the valve opening area of ​​the pressure reducing valve and causing blockage.

[0019] 2. This invention, by setting up a valve main body and a pressure regulating mechanism, utilizes an inlet-outlet connector to control the pressure of dense phase carbon dioxide at the outlet of the outlet connector. The pressure of the dense phase carbon dioxide at the outlet will press against the sealing slider in the valve sub-body through the connecting pipe. If the pressure of the dense phase carbon dioxide pressing against the sealing slider is greater than the spring tension of the pair of pressure-bearing lifting plates, the pressure generated by the dense phase carbon dioxide at the outlet of the outlet connector will push the sealing slider, causing the movable main rod to move downwards. When the movable main rod moves downwards, it will drive the pressure-reducing valve disc downwards, thereby creating a gap between the pressure-reducing valve disc and the valve port. The pressure of the dense phase carbon dioxide at the outlet of the outlet connector... The greater the pressure of carbon dioxide relative to the tension of the pair of pressure-bearing lifting plates of the telescopic spring, the larger the gap between the pressure-reducing valve disc and the valve port will be. The dense phase carbon dioxide in the inlet connecting pipe will enter the valve main body through the gap between the pressure-reducing valve disc and the valve port, and increase the pressure in the outlet connecting pipe. The increased pressure in the outlet connecting pipe will cause the pressure of the dense phase carbon dioxide medium in the outlet connecting pipe to pressurize the pressure-bearing lifting plate, causing the pressure-bearing lifting plate to drive the movable main rod to rise upward, which in turn causes the movable main rod to drive the pressure-reducing valve disc to rise and block the valve port. Repeating the above operation allows the device to automatically maintain a stable outlet pressure by relying on the energy of the dense phase carbon dioxide medium itself. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0022] Figure 3This is a three-dimensional structural diagram of the fixing sleeve of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the valve sub-body of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the interior of the valve main housing of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the movable main rod and rotating rod of the present invention;

[0026] Figure 7 This is a three-dimensional structural cross-sectional view of the rotating rod of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the linkage mechanism and the anti-blocking mechanism of the present invention.

[0028] Figure 9 This is a schematic diagram of the split structure of the linkage mechanism of the present invention;

[0029] Figure 10 This is a three-dimensional structural diagram of the linkage mechanism of the present invention;

[0030] Figure 11 This is a schematic diagram of the split structure of the anti-blocking mechanism of the present invention;

[0031] Figure 12 This is a three-dimensional structural diagram of the anti-blocking mechanism of the present invention.

[0032] [Explanation of Key Component Symbols]

[0033] 1. Valve main body; 2. Valve secondary body; 3. Sealing base; 4. Outlet connecting pipe; 5. Inlet connecting pipe; 6. Fixing sleeve; 7. Connecting pipe; 8. Surrounding heating wire;

[0034] 9. Pressure regulating mechanism; 901. Threaded rod; 902. Threaded tube; 903. Pressing plate; 904. Telescopic spring one;

[0035] 10. Movable main rod; 11. Pressure-bearing lifting plate; 12. Sealing slider; 13. Pressure-reducing valve disc; 14. First sealing ring; 15. Second sealing ring; 16. Slide groove; 17. Rotating rod;

[0036] 18. Linkage mechanism; 1801. Movable plate; 1802. Telescopic spring II; 1803. Limiting rod; 1804. Fixed rod I; 1805. Rotating plate; 1806. Support frame; 1807. Slide opening I; 1808. Slide opening II; 1809. Motor; 1810. Rotating column; 1811. Square long rod;

[0037] 19. Anti-blocking mechanism; 1901. Rotating tube; 1902. Sliding block; 1903. Connecting rod; 1904. Fixing plate; 1905. Limiting plate; 1906. Limiting square rod; 1907. Scraping plate; 1908. Telescopic spring three; 1909. Rotating slip ring; 1910. Circular track; 1911. Fixing rod two; 1912. Valve port; 1913. Guide ring block; 1914. Extrusion block. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] Please see Figure 1 , Figure 2 and Figure 4This embodiment proposes a dense-phase carbon dioxide pipeline antifreeze pressure reducing valve with uniform heating around the perimeter, including a valve main body 1. An outlet connecting pipe 4 is fixedly connected to the side of the valve main body 1. A surrounding heating wire 8 is sleeved on the outer surface of the valve main body 1 and fixedly connected to the outer surface of the valve main body 1. A sealing base 3 is fixedly connected to the bottom surface of the valve main body 1. A valve secondary body 2 is fixedly connected to the upper surface of the valve main body 1. An inlet connecting pipe 5 is fixedly connected to the side of the valve secondary body 2. A fixing sleeve 6 is fixedly connected to the upper surface of the valve secondary body 2. A connecting pipe 7 is fixedly connected between the upper end of the valve secondary body 2 and the outlet connecting pipe 4. A movable main rod 10 is provided inside the valve main body 1. The valve main body 1, valve secondary body 2, and fixing sleeve 6 are all sleeved on the outside of the movable main rod 10. A sealing slider 12 is fixedly connected to the middle of the movable main rod 10. A first sealing ring 14 and a second sealing ring 15 adapted to the sealing slider 12 are fixedly connected to the inner wall of the valve secondary body 2. The inlet connecting pipe 5... The outlet-exit connector 4 is the outlet. The pressure of the dense phase carbon dioxide at the outlet of the outlet-exit connector 4 will press against the sealing slider 12 in the valve sub-body 2 through the connecting pipe 7. If the pressure of the dense phase carbon dioxide pressing against the sealing slider 12 is greater than the spring tension of the extension spring-904 on the pressure-receiving lifting plate 11, the pressure generated by the dense phase carbon dioxide at the outlet of the outlet-exit connector 4 will push the sealing slider 12, causing the movable main rod 10 to move downward. When the movable main rod 10 moves downward, it will drive the pressure reducing valve disc 13 to move downward, thereby creating a gap between the pressure reducing valve disc 13 and the valve port 1912. The greater the pressure of the dense phase carbon dioxide at the outlet of the outlet of the outlet-exit connector 4 relative to the spring tension of the extension spring-904 on the pressure-receiving lifting plate 11, the larger the gap between the pressure reducing valve disc 13 and the valve port 1912 will be. The setting of the first sealing ring 14 and the second sealing ring 15 limits the movement range of the sealing slider 12, preventing the sealing slider 12 from moving excessively upward or downward, which would cause the connecting pipe 7 to be directly connected to the valve sub-body 2.

[0041] Example 2:

[0042] like Figure 3As shown, based on the same concept as Embodiment 1 above, this embodiment also proposes that the fixed sleeve 6 is internally provided with a pressure regulating mechanism 9. The pressure regulating mechanism 9 includes a threaded rod 901, and a threaded tube 902 is provided above the fixed sleeve 6. The threaded tube 902 penetrates the outer surface of the fixed sleeve 6 and is fixedly connected to the fixed sleeve 6. The threaded tube 902 is threadedly connected to the threaded rod 901. A pressing plate 903 is fixedly connected to the bottom end of the threaded rod 901. A pressure lifting plate 11 is rotatably connected to the top end of the movable main rod 10. 11 is slidably connected to the inner wall of the fixed sleeve 6. A telescopic spring 904 is fixedly connected between the pressure lifting plate 11 and the pressing plate 903. Through the setting of the pressure adjustment mechanism 9, when it is necessary to adjust the resistance force of the pressure lifting plate 11 to the pressure of the dense phase carbon dioxide medium, the pressing plate 903 is moved up or down by rotating the threaded rod 901, thereby changing the spring pressure of the telescopic spring 904 on the pressure lifting plate 11, and thus adjusting the resistance force of the pressure lifting plate 11 to the pressure of the dense phase carbon dioxide medium.

[0043] Example 3:

[0044] like Figure 5 , Figure 11 and Figure 12 As shown, based on the same concept as Embodiment 1 above, this embodiment also proposes that the valve main housing 1 is provided with an anti-blocking mechanism 19 inside. The anti-blocking mechanism 19 includes a valve port 1912 and an annular track 1910. The valve port 1912 penetrates the inner wall of the valve main housing 1 and is fixedly connected to the valve main housing 1. The bottom end of the movable main rod 10 is fixedly connected to a pressure reducing valve disc 13 adapted to the valve port 1912. The bottom surface of the pressure reducing valve disc 13 is rotatably connected to a rotating rod 17. The outer surface of the rotating rod 17 is slidably connected to a rotating tube 1901. Three slider blocks 1902 are fixedly connected to the inner wall of the moving tube 1901. Three slider grooves 16 adapted to the slider blocks 1902 are opened on the outer surface of the rotating rod 17. The three slider blocks 1902 are slidably connected to the inner wall of the three slider grooves 16 respectively. Through the sliding connection between the three slider blocks 1902 and the three slider grooves 16 respectively, the rotating rod 17 can drive the rotating tube 1901 to rotate through the three slider blocks 1902 and the three slider grooves 16 when rotating, without affecting the sliding of the rotating tube 1901 on the rotating rod 17.

[0045] like Figure 6 and Figure 7As shown, three connecting rods 1903 are fixedly connected to the outer surface of the rotating tube 1901, and fixed plates 1904 are fixedly connected to the outer surfaces of the three connecting rods 1903. A rotating slip ring 1909 is provided above the rotating tube 1901, and the three fixed plates 1904 are fixedly connected to the upper surface of the rotating slip ring 1909. The rotating slip ring 1909 is rotatably connected to the inner wall of the annular track 1910. The stability of the three fixed plates 1904 is increased by the sliding connection of the rotating slip ring 1909 to the inner wall of the annular track 1910.

[0046] A limiting plate 1905 is fixedly connected to the outer surface of the fixed plate 1904. A limiting square rod 1906 is fixedly connected to the outer surface of the limiting plate 1905. A scraping plate 1907 is slidably connected to the outer surface of the limiting square rod 1906. The scraping plate 1907 is adapted to the valve port 1912. A guide ring block 1913 adapted to the scraping plate 1907 is fixedly connected to the bottom surface of the valve port 1912. A telescopic spring 1908 is sleeved on the outer surface of the limiting square rod 1906. 908 is fixedly connected between the scraper plate 1907 and the limiting plate 1905. When the three scraper plates 1907 move upward, they are squeezed into the valve port 1912 by the guide ring block 1913. The spring pressure of the three telescopic springs 1908 makes the three scraper plates 1907 fit against the inner wall of the valve port 1912. The setting of the telescopic springs 1908 makes the scraper plates 1907 fit against the inner wall of the valve port 1912 by the spring pressure of the telescopic springs 1908.

[0047] Example 4:

[0048] like Figure 8 , Figure 9 and Figure 10 As shown, based on the same concept as Embodiment 1 above, this embodiment also proposes that the valve main housing 1 is provided with a linkage mechanism 18 inside. The linkage mechanism 18 includes a movable plate 1801. Two fixed rods 1804 are fixedly connected to the outer surface of the movable plate 1801. Rotating plates 1805 are provided on both sides of the movable plate 1801. The outer surface of the two rotating plates 1805 is provided with a sliding groove 1807 that is adapted to the fixed rods 1804. The two fixed rods 1804 are slidably connected to the two sliding grooves 1807 respectively. When the movable plate 1801 moves downward under pressure, the movable plate 1801 drives the two fixed rods 1804 to squeeze the two sliding grooves 1807 respectively, so that the ends of the two rotating plates 1805 that are close to each other flip downward. Similarly, when the movable plate 1801 moves upward under pressure, the ends of the two rotating plates 1805 that are close to each other flip upward.

[0049] A motor 1809 is fixedly connected to the bottom surface of the sealing base 3. A rotating column 1810 is fixedly connected to the output end of the motor 1809. The rotating column 1810 passes through the outer surface of the sealing base 3 and is rotatably connected to the sealing base 3. A square rod 1811 is fixedly connected to one end of the rotating column 1810. The square rod 1811 is slidably connected to the rotating rod 17. The motor 1809 is controlled to drive the square rod 1811 to rotate. The rotation of the square rod 1811 drives the rotating rod 17 to rotate, thereby causing the rotating rod 17 to drive the rotating tube 1901 to rotate through the three sliding blocks 1902. This causes the three scraping plates 1907 to rotate and scrape the frozen dry ice attached to the inner wall of the valve port 1912, causing the frozen dry ice to break and fall off, preventing it from continuing to form larger ice blocks.

[0050] Two support frames 1806 are fixedly connected to the upper surface of the sealing base 3. The two support frames 1806 are rotatably connected to the two rotating plates 1805 respectively. Two fixed rods 1911 are fixedly connected to the bottom surface of the annular track 1910. Two sliding grooves 1808 are opened on the outer surface of the two rotating plates 1805 respectively. The two sliding grooves 1808 are slidably connected to the two fixed rods 1911 respectively. When the movable plate 1801 moves downward under pressure, the movable plate 1801 drives the two fixed rods 1804 to squeeze the two sliding grooves 1807 respectively, so that the ends of the two rotating plates 1805 that are close to each other flip downward. Thus, the ends of the two rotating plates 1805 that are far apart from each other flip upward and press the two fixed rods 1911 upward respectively. Similarly, when the movable plate 1801 moves upward under pressure, the ends of the two rotating plates 1805 that are far apart from each other flip downward and pull the two fixed rods 1911 downward respectively.

[0051] The movable plate 1801 is sleeved on the outside of the rotating rod 17. Four limiting rods 1803 are fixedly connected to the outer surface of the sealing base 3. All four limiting rods 1803 are slidably connected to the movable plate 1801. A second telescopic spring 1802 is fixedly connected between the movable plate 1801 and the sealing base 3. A pressing block 1914 is rotatably connected to the outside of the rotating rod 17. The pressing block 1914 is located above the movable plate 1801. The setting of the four limiting rods 1803 increases the stability of the limiting rods 1803 when they move up and down, and prevents the movable plate 1801 from deviating when it moves. With the setting of the second telescopic spring 1802, when the upper surface of the movable plate 1801 is not under pressure, the movable plate 1801 is lifted upward by the spring pressure of the second telescopic spring 1802.

[0052] Working principle: Since the inlet pipe 5 is the inlet and the outlet pipe 4 is the outlet, the pressure of the dense phase carbon dioxide in the outlet pipe 4 will press against the sealing slider 12 in the valve sub-body 2 through the connecting pipe 7. If the pressure of the dense phase carbon dioxide pressing against the sealing slider 12 is greater than the spring tension of the telescopic spring-904 on the pressure-bearing lifting plate 11, the pressure generated by the dense phase carbon dioxide in the outlet pipe 4 will push the sealing slider 12 to move the movable main rod 10 downward. When the movable main rod 10 moves downward, it will drive the pressure reducing valve disc 13 to move downward, thereby creating a gap between the pressure reducing valve disc 13 and the valve port 1912. The greater the pressure of the dense phase carbon dioxide in the outlet pipe 4 relative to the spring tension of the telescopic spring-904 on the pressure-bearing lifting plate 11, the larger the gap between the pressure reducing valve disc 13 and the valve port 1912 will be.

[0053] When the pressure inside the outlet connecting pipe 4 is less than the spring pressure of the telescopic spring 904, the sealing slider 12 will be driven by the pressure change to move the movable main rod 10 downward. The movable main rod 10 will drive the pressure reducing valve disc 13 downward, causing the pressure reducing valve disc 13 to separate from the valve port 1912. At this time, the pressure reducing valve disc 13 will drive the pressing block 1914 on the rotating rod 17 to press the movable plate 1801, causing the movable plate 1801 to move downward and press the two rotating plates 1805 on both sides. This will cause the two rotating plates 1805 to lift the two fixed rods 1911 respectively. The two fixed rods 1911 will drive the rotating slip ring 1909 on the annular track 1910 to move upward. The upward movement of the rotating slip ring 1909 will drive the scraping plates 1907 on the three fixed plates 1904 to move. When the three scraping plates 1907 move upward, they are squeezed into the valve port 1912 by the guide ring block 1913. The spring pressure of the three telescopic springs 1908 causes the three scraping plates 1907 to adhere to the inner wall of the valve port 1912. The motor 1809 drives the square rod 1811 to rotate. The rotation of the square rod 1811 drives the rotating rod 17 to rotate, which in turn drives the rotating tube 1901 to rotate through the three sliding blocks 1902. This causes the three scraping plates 1907 to rotate and scrape the frozen dry ice attached to the inner wall of the valve port 1912, breaking the frozen dry ice and preventing it from continuing to freeze into larger ice blocks. This effectively avoids the problem of the pressure reducing valve being blocked due to the formation of dry ice around the valve disc inside the valve.

[0054] The dense phase carbon dioxide in the inlet connecting pipe 5 will enter the valve main body 1 through the gap between the pressure reducing valve disc 13 and the valve port 1912, and increase the pressure in the outlet connecting pipe 4. The increased pressure in the outlet connecting pipe 4 will pressurize the pressure-receiving lifting plate 11, causing the pressure-receiving lifting plate 11 to drive the movable main rod 10 to rise upward, which in turn will drive the pressure reducing valve disc 13 to block the valve port 1912. Repeating the above operation allows the device to automatically maintain a stable outlet pressure by relying on the energy of the dense phase carbon dioxide medium itself.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-reducing valve for a dense-phase carbon dioxide pipeline with uniform heating on a circumferential scale, comprising a valve main body (1), characterized in that: The valve main housing (1) is fixedly connected to an outlet connecting pipe (4) on its side. The valve main housing (1) is fixedly connected to a sealing base (3) on its bottom surface. The valve main housing (1) is fixedly connected to a valve secondary housing (2) on its upper surface. The valve main housing (1) is provided with an anti-blocking mechanism (19) inside. The anti-blocking mechanism (19) includes a valve port (1912) and an annular track (1910). The valve main housing (1) is provided with a linkage mechanism (18) inside. The linkage mechanism (18) includes a movable plate (1801). The outer surface of the movable plate (1801) is fixedly connected to two fixed rods (1804).

2. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 1, characterized in that: The outer surface of the main valve housing (1) is fitted with a surrounding heating wire (8), which is fixedly connected to the outer surface of the main valve housing (1). The side of the secondary valve housing (2) is fixedly connected to an inlet connecting pipe (5). The upper surface of the secondary valve housing (2) is fixedly connected to a fixing sleeve (6). The upper end of the secondary valve housing (2) is fixedly connected to an outlet connecting pipe (4) via a connecting pipe (7). The interior of the main valve housing (1) is provided with a movable main rod (10). The main valve housing (1), the secondary valve housing (2), and the fixing sleeve (6) are all fitted on the outside of the movable main rod (10). The middle part of the movable main rod (10) is fixedly connected to a sealing slider (12). The inner wall of the secondary valve housing (2) is fixedly connected to a first sealing ring (14) and a second sealing ring (15) that are compatible with the sealing slider (12).

3. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 2, characterized in that: The fixed sleeve (6) is provided with a pressure regulating mechanism (9), which includes a threaded rod (901). A threaded tube (902) is provided above the fixed sleeve (6). The threaded tube (902) penetrates the outer surface of the fixed sleeve (6) and is fixedly connected to the fixed sleeve (6). The threaded tube (902) is threadedly connected to the threaded rod (901). A pressing plate (903) is fixedly connected to the bottom end of the threaded rod (901). A pressure lifting plate (11) is rotatably connected to the top end of the movable main rod (10). The pressure lifting plate (11) is slidably connected to the inner wall of the fixed sleeve (6). A telescopic spring (904) is fixedly connected between the pressure lifting plate (11) and the pressing plate (903).

4. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 2, characterized in that: The bottom end of the movable main rod (10) is fixedly connected to a pressure reducing valve disc (13) that is compatible with the valve port (1912). The bottom surface of the pressure reducing valve disc (13) is rotatably connected to a rotating rod (17). The outer surface of the rotating rod (17) is slidably connected to a rotating tube (1901). The inner wall of the rotating tube (1901) is fixedly connected to three sliding blocks (1902). The outer surface of the rotating rod (17) is provided with three sliding grooves (16) that are compatible with the sliding blocks (1902). The three sliding blocks (1902) are slidably connected to the inner walls of the three sliding grooves (16).

5. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 4, characterized in that: Three connecting rods (1903) are fixedly connected to the outer surface of the rotating tube (1901). A fixing plate (1904) is fixedly connected to the outer surface of each of the three connecting rods (1903). A rotating slip ring (1909) is provided above the rotating tube (1901). The three fixing plates (1904) are fixedly connected to the upper surface of the rotating slip ring (1909). The rotating slip ring (1909) is rotatably connected to the inner wall of the annular track (1910).

6. The antifreeze pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 5, characterized in that: A limiting plate (1905) is fixedly connected to the outer surface of the fixed plate (1904). A limiting square rod (1906) is fixedly connected to the outer surface of the limiting plate (1905). A scraping plate (1907) is slidably connected to the outer surface of the limiting square rod (1906). The scraping plate (1907) is adapted to the valve port (1912). The valve port (1912) penetrates the inner wall of the valve main housing (1) and is fixedly connected to the valve main housing (1). A guide ring block (1913) adapted to the scraping plate (1907) is fixedly connected to the bottom surface of the valve port (1912). A telescopic spring three (1908) is sleeved on the outer surface of the limiting square rod (1906). The telescopic spring three (1908) is fixedly connected between the scraping plate (1907) and the limiting plate (1905).

7. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale according to claim 1, characterized in that: Rotating plates (1805) are provided on both sides of the movable plate (1801). The outer surfaces of the two rotating plates (1805) are provided with sliding grooves (1807) that are adapted to the fixed rods (1804). The two fixed rods (1804) are slidably connected to the two sliding grooves (1807) respectively.

8. The antifreeze and pressure reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale according to claim 4, characterized in that: A motor (1809) is fixedly connected to the bottom surface of the sealing base (3). A rotating column (1810) is fixedly connected to the output end of the motor (1809). The rotating column (1810) penetrates the outer surface of the sealing base (3) and is rotatably connected to the sealing base (3). A square rod (1811) is fixedly connected to one end of the rotating column (1810). The square rod (1811) is slidably connected to the rotating rod (17).

9. A pressure-reducing valve for dense-phase carbon dioxide pipelines with uniform heating on a circumferential scale as described in claim 7, characterized in that: The upper surface of the sealing base (3) is fixedly connected to two support frames (1806), and the two support frames (1806) are rotatably connected to two rotating plates (1805) respectively. The bottom surface of the annular track (1910) is fixedly connected to two fixing rods (1911). The outer surfaces of the two rotating plates (1805) are each provided with two sliding grooves (1808), and the two sliding grooves (1808) are slidably connected to the two fixing rods (1911) respectively.

10. A dense-phase carbon dioxide pipeline antifreeze pressure reducing valve with uniform heating around the perimeter as described in claim 4, characterized in that: The movable plate (1801) is sleeved on the outside of the rotating rod (17). Four limiting rods (1803) are fixedly connected to the outer surface of the sealing base (3). All four limiting rods (1803) are slidably connected to the movable plate (1801). A telescopic spring (1802) is fixedly connected between the movable plate (1801) and the sealing base (3). A pressing block (1914) is rotatably connected to the outside of the rotating rod (17). The pressing block (1914) is located above the movable plate (1801).

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