Pneumatic control equipment for industrial steam supply high-temperature pipeline of nuclear power plant

Abstract

The invention relates to the field of nuclear power equipment, in particular to pneumatic control equipment for an industrial steam supply high-temperature pipeline of a nuclear power plant. According to the equipment, a first heat insulation assembly is installed at the bottom of a cylinder support of a pneumatic valve, and the upper and lower sides of the first heat insulation assembly are fixed by a second heat insulation assembly and a third heat insulation assembly respectively; a fourth heat insulation assembly is filled between the cylinder bracket of the pneumatic valve and the valve body pressing plate; a fifth heat insulation assembly is installed between the air cylinder support and the positioner installation support, and a sixth heat insulation assembly is installed between the positioner installation support and the positioner. Through innovative design of the heat insulation assembly and a modular installation method, the influence of heat conduction and heat radiation is effectively isolated, the positioner works in a reasonable temperature interval, and the purpose of long-term reliable and stable operation of the positioner is achieved.

Description

Technical Field

[0001] The invention relates to the field of nuclear power equipment, and in particular to a pneumatic control device for a high-temperature pipeline of industrial steam supply in a nuclear power plant. Background Art

[0002] Pneumatic control valves have the advantages of fast response speed and easy access to clean compressed air. They have been widely used in industrial systems and occupy an increasingly important position in industrial production. At present, as one of the important equipment in nuclear power plants, pneumatic control valves have been widely used in nuclear island and conventional island related systems of nuclear power plants that have been built and are under construction. Positioners are the control core of the adjustment quality of pneumatic control valves, and their working environment is an important factor in determining the life of positioners. At present, nuclear power plants generally have the problem of relatively high failure rates of positioners in process pipelines with high temperatures and working environments. The more commonly used method is to change to a split positioner installation method, keep the mainboard and sealing components away from high-temperature environments, improve the working environment of the positioner, and extend its service life. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to provide a pneumatic control device for a high-temperature pipeline of industrial steam supply in a nuclear power plant, which effectively isolates the influence of heat conduction and heat radiation through innovative design of insulation components and modular installation methods, so that the positioner can work in a reasonable temperature range, thereby achieving the purpose of long-term reliable and stable operation of the positioner.

[0004] The present invention provides a pneumatic control device for a high-temperature pipeline of industrial steam supply in a nuclear power plant, wherein a first heat insulation component is installed at the bottom of a cylinder bracket of a pneumatic valve, and upper and lower sides of the first heat insulation component are respectively fixed by a second heat insulation component and a third heat insulation component;

[0005] A fourth heat insulation component is partially filled between the cylinder support and the valve body pressure plate of the pneumatic valve;

[0006] The fifth heat insulation component is installed between the cylinder bracket and the positioner mounting bracket.

[0007] A sixth heat insulation assembly is installed between the positioner mounting bracket and the positioner.

[0008] In a specific embodiment of the present invention, the main valve body and the cylinder in the pneumatic valve are connected through a cylinder bracket, the valve stem is connected through a coupling, the upper end of the valve stem is connected to the cylinder, and the other end is connected to the main valve body, and the positioner is installed on the cylinder bracket through the positioner bracket. The positioner controls the air intake and exhaust of the cylinder, thereby realizing the function of valve switching.

[0009] In a specific embodiment of the present invention, four third heat insulation components are evenly installed in four directions at the bottom of the cylinder bracket and fixed to the cylinder bracket by bolts.

[0010] In a specific embodiment of the present invention, the first heat insulation component is a square structure with the same size as the insulation upper plane of the main valve body, and is installed parallel to the insulation upper plane.

[0011] In a specific embodiment of the present invention, the second thermal insulation component is connected and fixed to the third thermal insulation component by bolts.

[0012] In a specific embodiment of the present invention, the outer cover box of the second thermal insulation component is made of metal, and is filled with thermal insulation boards and thermal insulation cotton.

[0013] In a specific embodiment of the present invention, the fourth heat insulation component is made in proportion to the circular space between the inner wall of the cylinder support and the outer wall of the valve body pressure plate.

[0014] In a specific embodiment of the present invention, the size of the fifth thermal insulation component is larger than the fitting surface of the positioner mounting bracket.

[0015] In a specific embodiment of the present invention, the size of the sixth thermal insulation component is larger than the fitting surface of the positioner mounting bracket.

[0016] Compared with the prior art, the pneumatic control device for high-temperature pipelines for industrial steam supply in nuclear power plants of the present invention has the following beneficial effects:

[0017] (1) Multiple heat-insulating components are set in the pneumatic control equipment, which has no effect on the equipment's performance and status observation. Some or all components can be selectively removed according to equipment maintenance needs, and disassembly and assembly are convenient.

[0018] (2) The thermal insulation components are reusable.

[0019] (3) The internal filling materials of the insulation components are of the same size, and the internal filling materials of the same insulation components can be directly applied.

[0020] (4) The external thermal insulation component of the cylinder bracket is a square with equal dimensions on all four sides, which effectively reduces the impact of heat radiation on the other three surfaces except the positioner mounting surface, and uses thermal insulation components made of two materials in combination to enhance the thermal insulation effect.

[0021] (5) Heat insulation components are installed on both sides of the positioner mounting bracket, and double-layer heat insulation components enhance the heat insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram showing the structure of the pneumatic control equipment for the high-temperature industrial steam supply pipeline of a nuclear power plant;

[0023] In the figure, 1: cylinder; 2: cylinder bracket; 3: second thermal insulation assembly; 4: first thermal insulation assembly; 5: third thermal insulation assembly; 6: main valve body; 7: valve stem; 8: fifth thermal insulation assembly; 9: positioner mounting bracket; 10: sixth thermal insulation assembly; 11: positioner; 12: coupling; 13: valve body pressure plate; 14: fourth thermal insulation assembly. DETAILED DESCRIPTION

[0024] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0025] The embodiment of the present invention discloses a pneumatic control device for a high-temperature pipeline of industrial steam supply in a nuclear power plant, such as Figure 1 As shown, it includes a pneumatic valve and a heat insulation component arranged at different positions of the pneumatic valve,

[0026] The main valve body 6 and the cylinder 1 in the pneumatic valve are connected through the cylinder bracket 2, and the valve stem 7 is connected through the coupling 12. The upper end of the valve stem 7 is connected to the cylinder 1, and the other end is connected to the main valve body 6. The positioner 11 is installed on the cylinder bracket 2 through the positioner bracket 9. The positioner 11 controls the air intake and exhaust of the cylinder, thereby realizing the function of valve switching.

[0027] The two main ways of heat transfer are heat radiation and heat conduction. Heat is conducted to the positioner 11 through the air and the positioner mounting bracket 9, causing the temperature of the positioner 11 to rise. In order to effectively prevent the effects of heat radiation and heat conduction, different insulation components are installed to reduce the impact of temperature on the positioner 11.

[0028] A first heat insulation component 4 is installed at the bottom of the cylinder support 2 of the pneumatic valve 6, and the upper and lower sides of the first heat insulation component 4 are fixed by the second heat insulation component 3 and the third heat insulation component 5 respectively;

[0029] The third thermal insulation component 5 is a mounting bracket with a certain rigidity. Four of them are evenly installed in four directions at the bottom of the cylinder bracket 2 and are fixed to the cylinder bracket 2 by bolts. Its main function is to support the first thermal insulation component 4 and the second thermal insulation component 3.

[0030] The first heat insulation component 4 is a square structure with the same size as the insulation upper plane of the main valve body 6, and is installed parallel to the insulation upper plane to establish an air space to optimize the insulation effect.

[0031] One of the functions of the second insulation component 3 is to fix the first insulation component 4, which is connected and fixed to the third insulation component 5 by bolts, so that the first insulation component 4 is not affected by vibration, external force, etc. and is not offset or fallen off; the second function is heat insulation. The outer cover is made of metal, and is filled with insulation boards and thermal insulation cotton inside to enhance the insulation effect.

[0032] A fourth thermal insulation component 14 is partially filled between the cylinder support 2 and the valve body pressure plate 13 of the pneumatic valve 6; the fourth thermal insulation component 14 is made of a thermal insulation plate in proportion to the circular space between the inner wall of the cylinder support 2 and the outer wall of the valve body pressure plate 13, and the thermal insulation component does not require additional fixation after installation. The installation of the fourth thermal insulation component 14 does not affect the movement of the valve stem and the steam leakage between the valve body pressure plate 13 and the valve stem 7 can be observed.

[0033] The fifth heat insulation assembly 8 is installed between the cylinder bracket 2 and the positioner mounting bracket 9.

[0034] Without affecting the action of the positioner feedback link, the size of the fifth thermal insulation component 8 is larger than the fitting surface of the positioner mounting bracket. In addition to reducing the heat conduction effect, it also has a certain heat radiation isolation function.

[0035] The sixth heat insulation assembly 10 is installed between the positioner mounting bracket 9 and the positioner 11 .

[0036] Under the premise of not affecting the action of the feedback valve stem 7 of the positioner 22, the size of the sixth thermal insulation component 10 is larger than the fitting surface of the positioner mounting bracket 9, thereby minimizing the heat conduction effect.

[0037] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic control device for high-temperature industrial steam supply pipelines in nuclear power plants, characterized in that: A first heat insulation component is installed at the bottom of the cylinder bracket of the pneumatic valve, and the upper and lower sides of the first heat insulation component are respectively fixed by the second heat insulation component and the third heat insulation component; A fourth heat insulation component is partially filled between the cylinder support and the valve body pressure plate of the pneumatic valve; The fifth heat insulation component is installed between the cylinder bracket and the positioner mounting bracket. A sixth heat insulation assembly is installed between the positioner mounting bracket and the positioner.

2. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1 is characterized in that: The main valve body and the cylinder in the pneumatic valve are connected through a cylinder bracket, the valve stem is connected through a coupling, the upper end of the valve stem is connected to the cylinder, and the other end is connected to the main valve body. The positioner is installed on the cylinder bracket through the positioner bracket. The positioner controls the air intake and exhaust of the cylinder, thereby realizing the function of valve switching.

3. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1, characterized in that: Four third heat insulation components are evenly installed in four directions at the bottom of the cylinder bracket and fixed on the cylinder bracket by bolts.

4. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 3 is characterized in that: The first heat insulation component is a square structure with the same size as the insulation upper plane of the main valve body, and is installed parallel to the insulation upper plane.

5. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 4, characterized in that: The second thermal insulation component is connected and fixed to the third thermal insulation component by bolts.

6. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1, characterized in that: The outer cover box of the second thermal insulation component is made of metal and is filled with thermal insulation boards and thermal insulation cotton.

7. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1, characterized in that: The fourth heat insulation component is made in proportion to the circular space between the inner wall of the cylinder support and the outer wall of the valve body pressure plate.

8. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1, characterized in that: The size of the fifth thermal insulation component is larger than the fitting surface of the positioner mounting bracket.

9. The pneumatic control equipment for high-temperature industrial steam supply pipelines in nuclear power plants according to claim 1, characterized in that: The size of the sixth thermal insulation component is larger than the fitting surface of the positioner mounting bracket.

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