A protective valve for a water vapor sampling device of a thermal power generator set

Abstract

The embodiment of the present application provides a protective valve for a water vapor sampling device of a thermal power generator set, which relates to the field of valve technology. The protective valve for a water vapor sampling device of a thermal power generator set includes: a main valve assembly, a positioning assembly and a supporting and blocking assembly. The main valve assembly includes a valve body, a valve seat, a pressure relief push rod, a clamping nut, a valve stem and a handwheel. The valve seat is arranged inside the valve body, the clamping nut is installed on the top of the valve body, the valve stem and the clamping nut are screwed and installed, and the pressure relief push rod is arranged at the bottom of the valve stem, and the handwheel is installed at the top of the valve stem; the positioning assembly includes an outer cylinder shell and an electromagnet with a cavity structure in the middle, the positioning assembly is fixed at the bottom of the valve body, and the electromagnet is installed inside the outer cylinder shell. Compared with traditional solenoid valves, the protective valve of the sampling device has a better active protection effect when used. Even if the valve is powered on again, human intervention is required for normal use, thereby improving the safety protection performance of the valve.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a protective valve for a water vapor sampling device of a thermal power generator set. Background Art

[0002] Steam and water circulate in thermal power generating units for energy conversion. The quality of steam and water inside the generating units will affect the efficiency and safety of the equipment. The steam and water sampling system can determine the quality of steam and water inside the generating units by sampling.

[0003] When the temperature of the sampled steam and water is too high, the sampling device system is easily damaged. The current solution is to install a solenoid valve between the sampling device system and the generator set to close the sampling pipeline. Although the solenoid valve can automatically close the pipeline when the power is off, the sampling pipeline will also be automatically connected after the power is turned on. The solenoid valve in the sampling pipeline lacks an active protection mechanism, which is easy to cause secondary damage to the sampling device system. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a protection valve for a water vapor sampling device of a thermal power generator set to solve the problem that although the current solenoid valve can automatically close the pipeline when the power is off, the sampling pipeline will also be automatically connected after the power is on, and the solenoid valve in the sampling pipeline lacks an active protection mechanism, which is easy to cause secondary damage to the sampling device system.

[0005] According to an embodiment of the present application, a protective valve for a water vapor sampling device of a thermal power generator set includes: a main valve assembly, a positioning assembly, and a supporting and blocking assembly.

[0006] The main valve assembly comprises a valve body, a valve seat, a pressure relief push rod, a clamping nut, a valve stem and a hand wheel, wherein the valve seat is arranged inside the valve body, the clamping nut is installed on the top of the valve body, the valve stem and the clamping nut are screwed and installed, and the pressure relief push rod is arranged at the bottom end of the valve stem, and the hand wheel is installed at the top end of the valve stem;

[0007] The positioning assembly includes an outer cylinder shell and an electromagnet with a cavity structure in the middle, the positioning assembly is fixed to the bottom of the valve body, and the electromagnet is installed inside the outer cylinder shell;

[0008] The supporting and sealing assembly includes a column block, a return spring, a top support rod, a valve core and a fixed plate. The fixed plate is fixedly arranged inside the outer cylinder shell and is located above the electromagnet. The column block is fixed to the bottom end of the top support rod. The top end of the top support rod movably passes through the bottom wall of the valve body. The valve core is arranged on the top end of the top support rod, and the top support rod supports the valve core and cooperates with the valve seat in a sealing manner. The return spring is arranged at the bottom end of the inner part of the outer cylinder shell to elastically support the column block. The column block movably passes through the cavity area in the middle of the electromagnet, and the column block cooperates with the electromagnet by magnetic attraction.

[0009] The sample water enters from the water inlet of the valve body, and the sample water entering the water inlet of the valve body flows from the bottom of the valve seat to the top, and finally flows out from the water outlet at the other end of the valve body. Under normal conditions, the valve is in a normally open state. At this time, the electromagnet magnetically absorbs the column block, and there is a gap between the valve core and the valve seat for the sample water to flow, and the reset spring is in a compressed state at this time. When the sample water is overheated or the cooling medium is interrupted, the electromagnet receives a control signal and cuts off the power. At this time, the electromagnet cannot absorb the column block. Under the elastic force of the reset spring, the column block pushes the top support rod to move upward. The upward moving top support rod will also drive the top valve core and the valve seat to complete the sealing and cut off the flow of water samples in the sampling pipeline. At this time, the water pressure at the water inlet port of the valve body begins to rise, and the valve core fits tightly with the valve seat under the pressure of the sample water to form a self-locking state, further improving the sealing effect of the valve core and the valve seat. When the cold water returns to normal temperature or the sample water temperature returns to normal, turn the handwheel to drive the valve stem to rotate. The rotating valve stem drives the pressure relief top rod to gradually move downward under the screw connection with the clamping nut. The bottom end of the downward-moving pressure relief push rod presses against the valve core and moves downward, that is, the column block is driven downward by the top support rod and is magnetically attracted by the electromagnet that is energized again. After that, the hand wheel is turned in the opposite direction to drive the pressure relief push rod to move upward and reset, and the valve will operate normally again. Compared with the traditional solenoid valve, the sampling device protection valve has a better active protection effect when used. Even if the valve is energized again, human intervention is required for normal use, which improves the safety protection performance of the valve.

[0010] Preferably, the valve core includes an upper cover plate, a lower cover plate and a second flexible ring belt, the upper cover plate is connected to the lower cover plate through a support column, and the second flexible ring belt connects the upper cover plate and the outer edge of the lower cover plate to form a first air chamber, an upper tube is fixed to the bottom of the lower cover plate, and a vent is provided on the lower cover plate to connect the first air chamber and the upper tube, a lower tube is fixed above the fixed plate, and a hose is provided between the bottom end of the upper tube and the top end of the lower tube.

[0011] Preferably, the top support rod comprises a lower rod body and an upper rod body, the upper rod body is fixed above the lower rod body, the upper rod body movably passes through the fixing plate, and the top end of the upper rod body is connected to the bottom of the lower cover plate.

[0012] Preferably, a sealing ring is provided in the middle of the fixing plate, and the upper rod body movably passes through the sealing ring.

[0013] Preferably, a limiting ring plate is provided at the bottom of the sealing ring, and the limiting ring plate is fixedly connected to the fixing plate by bolts.

[0014] Preferably, the column block is fixedly sleeved outside the lower rod body.

[0015] Preferably, the outer cylinder shell comprises a cylinder shell and a bottom cover, the top end of the cylinder shell is fixedly connected to the bottom of the valve body, and the bottom cover is detachably arranged at the bottom end of the cylinder shell.

[0016] Preferably, the supporting and blocking assembly further comprises a limiting column, the bottom end of which is fixed to the upper surface of the bottom cover, and the return spring is sleeved on the outside of the limiting column.

[0017] Preferably, the positioning assembly further comprises a lower limiting ring, which is arranged at the bottom of the return spring and fixedly connected to the outer cylinder shell.

[0018] Preferably, the positioning assembly further comprises an upper limit ring, which is arranged on the top of the return spring and is fixedly connected to the outer cylinder shell.

[0019] The protective valve of the water vapor sampling device of the thermal power generator set also includes a sealing auxiliary component, which includes a sleeve, a connecting block, a support rod, a piston, a riser, a seat shell and a first flexible ring belt. The connecting block is located below the fixed plate, and the connecting block is fixedly connected to the outer wall of the lower rod body. The bottom end of the sleeve is fixedly arranged on the outer surface of the fixed plate, the piston is arranged inside the sleeve, the bottom end of the support rod is connected to the connecting block, and the top end of the support rod slides through the fixed plate and is connected to the piston. The seat shell is fixedly arranged at the bottom of the valve seat, and the first flexible ring belt is arranged on the inner ring of the seat shell to form a second air chamber. The bottom end of the riser is connected to the top end of the sleeve, and the top end of the riser passes through the bottom of the seat shell and is connected to the second air chamber.

[0020] The beneficial effects of the present application are as follows: the present application obtains a protection valve for a water vapor sampling device of a thermal power generator set through the above-mentioned design. When the sample water is over-temperature or the cooling medium is interrupted, the electromagnet is powered off and cannot adsorb the column block. Under the elastic force of the reset spring, the column block pushes the joint between the valve core and the valve seat to complete the seal and cut off the flow of water samples in the sampling pipeline. At this time, the water pressure at the water inlet port of the valve body begins to rise, and the valve core fits tightly with the valve seat under the pressure of the sample water to form a self-locking state, further improving the sealing effect of the valve core and the valve seat. Compared with traditional solenoid valves, the protection valve of the sampling device has a better active protection effect when used. Even if the valve is powered on again, human intervention is required for normal use, which improves the safety protection performance of the valve.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of a protective valve of a water vapor sampling device for a thermal power generator set according to an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the internal structure of a protection valve of a water vapor sampling device for a thermal power generator set according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the internal structure of a main valve assembly according to an embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the main structure of the positioning assembly and the internal part of the valve body according to an embodiment of the present application;

[0027] Figure 5 It is a schematic diagram of the structure of the electromagnet, the lower limit ring and the upper limit ring according to an embodiment of the present application;

[0028] Figure 6 is a schematic structural diagram of a support and plugging assembly and a sealing auxiliary assembly according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of the structure of a return spring and a limit column according to an embodiment of the present application;

[0030] Figure 8 It is a schematic diagram of the structure of the top support rod, valve core, upper tube, lower tube and hose according to an embodiment of the present application;

[0031] Fig. 9 It is a schematic diagram of the structure of the fixing plate and the sealing auxiliary component according to an embodiment of the present application.

[0032] Reference numerals:

[0033] 1. Main valve assembly; 11. Valve body; 12. Valve seat; 13. Pressure relief push rod; 14. Compression nut; 15. Valve stem; 16. Hand wheel; 2. Positioning assembly; 21. Outer cylinder shell; 211. Cylinder shell; 212. Bottom cover; 22. Electromagnet; 23. Lower limit ring; 24. Upper limit ring; 3. Support and plug assembly; 31. Column block; 32. Reset spring; 33. Push rod; 331. Lower rod body; 332. Upper rod body; 34. Valve core; 3 41. Upper cover plate; 342. Lower cover plate; 343. Second flexible ring belt; 344. Support column; 345. Vent hole; 35. Fixing plate; 36. Limiting column; 37. Sealing ring; 38. Limiting ring plate; 4. Sealing auxiliary component; 41. Sleeve; 42. Connecting block; 43. Support rod; 44. Piston; 45. Vertical pipe; 46. Sealing shell; 47. First flexible ring belt; 48. Small hole; 51. Upper tube; 52. Lower tube; 53. Hose. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0035] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] A protective valve for a water vapor sampling device of a thermal power generator set according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0038] See also Figure 1-Figure 9 According to an embodiment of the present application, a protective valve for a water vapor sampling device of a thermal power generator set includes: a main valve assembly 1, a positioning assembly 2 and a supporting and blocking assembly 3.

[0039] Among them, the sampling device protection valve is installed on the sample water pipeline after the pressure reducing valve, and the protection valve and the temperature control display or program control system constitute a temperature protection device for protecting the sampling device. Through the cooperation of the main valve component 1, the positioning component 2, and the support and plugging component 3, compared with the traditional solenoid valve controlling the sampling pipeline, the sampling device protection valve can be closed and blocked after blocking the sampling pipeline, and manual operation is required to complete the reset state. Since the sample water is reliably cut off by the protection valve when the cooling water of the device is interrupted or the sample water temperature exceeds the temperature, the sample water temperature no longer rises, so the safe operation of the device and the instrument is improved to a new level. Compared with the bypass solenoid valve protection method, its biggest feature is to change passive protection to active protection, completely avoiding damage to the sampling device.

[0040] See also Figure 1-Figure 4 and Figure 6 The main valve assembly 1 includes a valve body 11, a valve seat 12, a pressure relief push rod 13, a clamping nut 14, a valve stem 15 and a handwheel 16. The valve seat 12 is arranged inside the valve body 11, and the valve seat 12 and the valve body 11 are integrally formed. The clamping nut 14 is installed on the top of the valve body 11 by screwing. The valve stem 15 is screwed and installed with the clamping nut 14, and the pressure relief push rod 13 is arranged at the bottom of the valve stem 15, and the handwheel 16 is installed at the top of the valve stem 15. The positioning assembly 2 includes an outer cylinder shell 21 and an electromagnet 22 with a cavity structure in the middle. The positioning assembly 2 is fixed at the bottom of the valve body 11, and the electromagnet 22 is installed inside the outer cylinder shell 21. The supporting and blocking assembly 3 includes a column block 31, a reset spring 32, a top support rod 33, a valve core 34 and a fixing plate 35. The fixing plate 35 is fixed inside the outer cylinder shell 21 by welding, and the fixing plate 35 is located above the electromagnet 22. The column block 31 is fixed at the bottom end of the top support rod 33, and the top end of the top support rod 33 movably penetrates the bottom wall of the valve body 11. The valve core 34 is arranged at the top end of the top support rod 33, and the top support rod 33 supports the valve core 34 to seal with the valve seat 12. The return spring 32 is arranged at the bottom end of the outer cylinder shell 21 to elastically support the column block 31. The column block 31 movably penetrates the cavity area in the middle of the electromagnet 22, and the column block 31 and the electromagnet 22 are magnetically attracted and adsorbed.

[0041] The working principle of the protection valve of the water vapor sampling device of the thermal power generator set is as follows: the sample water enters from the water inlet end of the valve body 11, and the sample water entering the water inlet of the valve body 11 flows from the bottom of the valve seat 12 to the top, and finally flows out from the water outlet at the other end of the valve body 11. Under normal conditions, the valve is in a normally open state. At this time, the electromagnet 22 magnetically absorbs the column block 31, and there is a gap between the valve core 34 and the valve seat 12 for the sample water to flow, and the reset spring 32 is in a compressed state at this time. When the sample water is overheated or the cooling medium is interrupted, the electromagnet 22 receives a control signal to cut off the power. At this time, the electromagnet 22 cannot absorb the column block 31. Under the elastic force of the reset spring 32, the column block 31 pushes the top support rod 33 to move upward, and the top support rod 33 moving upward will also drive the top valve core 34 and the valve seat 12 to complete the sealing and cut off the flow of water samples in the sampling pipeline. At this time, the water pressure at the water inlet port of the valve body 11 begins to rise, and the valve core 34 fits tightly with the valve seat 12 under the pressure of the sample water to form a self-locking state, further improving the sealing effect of the valve core 34 and the valve seat 12. When the cold water returns to normal temperature or the sample water temperature returns to normal, the hand wheel 16 is turned to drive the valve stem 15 to rotate, and the rotating valve stem 15 drives the pressure relief push rod 13 to gradually move downward under the threaded cooperation with the clamping nut 14. The bottom end of the downward-moving pressure relief push rod 13 presses against the valve core 34 to move downward, that is, the column block 31 is driven downward by the top support rod 33 to be magnetically attracted by the electromagnet 22 that is energized again. Thereafter, the hand wheel 16 is turned in the opposite direction to drive the pressure relief push rod 13 to move upward and reset, and the valve will operate normally again. Compared with the traditional solenoid valve, the sampling device protection valve has a better active protection effect when used. Even if the valve is energized again, human intervention is required for normal use, which improves the safety protection performance of the valve.

[0042] The bottom of the valve body 11 is provided with a slot for the fixing plate 35 to penetrate and move. The top of the outer cylinder shell 21 and the outer wall of the bottom of the valve body 11 are seamlessly welded to ensure the sealing performance of the valve.

[0043] The valve core 34 and the valve seat 12 in the protection valve of the water vapor sampling device of the thermal power generator set are usually sealed with a sealing gasket, and the conventional sealing method of the sealing gasket is easy to reduce the sealing performance of the sealing gasket under the repeated stamping of the valve core 34 and the valve seat 12, affecting the sealing effect between the valve seat 12 and the valve core 34. In addition, the slot on the fixed plate 35 is for the top support rod 33 to slide through, and there is a certain gap between the fixed plate 35 and the top support rod 33, which is easy to seep water. Even if a sealing ring is used, it is difficult to solve the water seepage problem in the gap. The seepage water enters the bottom of the fixed plate 35 and easily causes damage to the electromagnet 22.

[0044] In the above specific implementation, please refer to Figure 8The valve core 34 includes an upper cover plate 341, a lower cover plate 342 and a second flexible ring belt 343. The upper cover plate 341 is connected to the lower cover plate 342 through a support column 344. The upper cover plate 341, the support column 344 and the lower cover plate 342 are integrally formed; and the second flexible ring belt 343 connects the outer edges of the upper cover plate 341 and the lower cover plate 342 to form a first air chamber. The second flexible ring belt 343 is preferably made of rubber, silicone, latex and other elastic ring belts. An upper tube 51 is fixed at the bottom of the lower cover plate 342. The lower cover plate 342 and the upper tube 51 can be integrally formed; and a vent hole 345 is provided on the lower cover plate 342 to connect the first air chamber and the upper tube 51. The lower tube 52 is fixedly provided above the fixing plate 35 by seamless welding. A hose 53 is provided between the bottom end of the upper tube 51 and the top end of the lower tube 52. The top support rod 33 includes a lower rod body 331 and an upper rod body 332. The upper rod 332 is fixed above the lower rod 331, and the upper rod 332 and the lower rod 331 are integrally formed. The upper rod 332 movably penetrates the fixing plate 35, and the top of the upper rod 332 is connected to the bottom of the lower cover plate 342. A sealing ring 37 is provided in the middle of the fixing plate 35, and the upper rod 332 movably penetrates the sealing ring 37. The column block 31 is fixedly sleeved outside the lower rod 331.

[0045] When the valve is in a normal water flow state, the hose 53 is in a spherical structure. When the electromagnet 22 is powered off and loses its magnetic attraction to the column block 31, the return spring 32 elastically supports the column block 31 to move upward under the elastic force of the return spring 32, that is, the lower rod 331 and the upper rod 332 are driven upward through the column block 31. The upper rod 332 moving upward pushes the lower cover plate 342, the upper tube 51, the valve core 34 and the upper cover plate 341 to move upward as a whole until the side walls of the upper cover plate 341 and the lower cover plate 342 contact the inner ring of the valve seat 12. As the upper rod 332 gradually moves upward, the hose 53 between the lower tube 52 and the upper tube 51 is stretched, and the air in the spherical hose 53 is compressed and enters the first air chamber, so that the second flexible ring 343 between the upper cover plate 341 and the lower cover plate 342 is pressed to bulge outward, and the bulging area of ​​the second flexible ring 343 contacts the inner circle of the valve seat 12, so that the valve core 34 and the valve seat 12 have a better sealing effect under air pressure. After the valve core 34 moves downward and resets, the top support rod 33 moves downward and also resets the hose 53 between the upper tube 51 and the lower tube 52 to a spherical structure. Compared with the traditional setting of using a sealing gasket to seal between the valve core 34 and the valve seat 12, this sealing setting is that while the top support rod 33 in the valve pushes the valve core 34 to contact and close with the valve seat 12, the supporting performance of the top support rod 33 is used in conjunction with the first air chamber composed of the upper tube 51, the lower tube 52, the hose 53 and the upper cover plate 341, the lower cover plate 342, and the second flexible ring belt 343 to communicate with each other, and the sealing effect between the valve core 34 and the valve seat 12 is improved by using the change in air pressure.

[0046] Preferably, welding sealing is adopted between the fixed plate 35 and the lower tube 52, and the upper rod body 332 adopts the method of supporting the valve core 34 inside the upper tube 51, the lower tube 52 and the hose 53 to contact the valve seat 12, and the lower tube 52, the hose 53, the upper tube 51, the lower cover plate 342, the second flexible ring belt 343 and the upper cover plate 341 cooperate with the fixed plate 35 from bottom to top to form a closed cavity, so as to prevent water above the fixed plate 35 from entering the lower part of the fixed plate 35 through the slot in the middle part of the fixed plate 35, so as to prevent the electromagnet 22 from being stained by water, thereby better protecting the electromagnet 22 under the fixed plate 35.

[0047] The sealing ring 37 between the upper rod 332 and the fixing plate 35 is used to seal the air, reducing the compressed air entering under the fixing plate 35 when the hose 53 is stretched, so that there is a strong pressure inside the first air chamber.

[0048] Furthermore, a limiting ring plate 38 is provided at the bottom of the sealing ring 37, and the limiting ring plate 38 is fixedly connected to the fixing plate 35 by bolts. The limiting ring plate 38 is provided to better support the sealing ring 37 between the fixing plate 35 and the upper rod body 332, so that when friction occurs between the upper rod body 332 and the sealing ring 37, the sealing ring 37 will not be deflected.

[0049] For specific settings, see Figure 2 and Figure 7 The outer cylinder shell 21 includes a cylinder shell 211 and a bottom cover 212. The top of the cylinder shell 211 is fixedly connected to the bottom of the valve body 11, and the bottom cover 212 is detachably arranged at the bottom of the cylinder shell 211 by bolts. That is, by removing the bottom cover 212, the components such as the electromagnet 22 inside the cylinder shell 211 can be inspected and replaced. The support and plugging assembly 3 also includes a limit column 36, the bottom end of the limit column 36 is fixed to the upper surface of the bottom cover 212, and the return spring 32 is sleeved on the outside of the limit column 36. The setting of the limit column 36 is to improve the stability of the return spring 32 during compression and relaxation.

[0050] Specifically, see Figure 5 The positioning assembly 2 further includes a lower limit ring 23, which is arranged at the bottom of the reset spring 32, and the lower limit ring 23 is fixedly connected to the outer cylinder shell 21 by bolts. The positioning assembly 2 further includes an upper limit ring 24, which is arranged at the top of the reset spring 32, and the upper limit ring 24 is fixedly connected to the outer cylinder shell 21 by bolts. The lower limit ring 23 is used to limit the bottom of the electromagnet 22, and the upper limit ring 24 is used to limit the top of the electromagnet 22, so that the electromagnet 22 is fixed more firmly inside the outer cylinder shell 21.

[0051] If the protective valve of the water vapor sampling device of the thermal power generator set can achieve a better sealing effect between the valve core 34 and the valve seat 12 during the upward movement of the valve core 34, the sealing effect of the protective valve can be further improved.

[0052] See also Figure 6 and Fig. 9 The protection valve of the water vapor sampling device of the thermal power generator set also includes a sealing auxiliary component 4, which includes a sleeve 41, a connecting block 42, a support rod 43, a piston 44, a riser 45, a seat shell 46 and a first flexible ring belt 47. The connecting block 42 is located below the fixed plate 35, and the connecting block 42 is fixedly connected to the outer wall of the lower rod body 331 by bolts. The bottom end of the sleeve 41 is fixedly arranged on the upper surface of the fixed plate 35, and the bottom end of the sleeve 41 and the fixed plate 35 are preferably connected by sealing welding. The piston 44 is arranged inside the sleeve 41, the bottom end of the support rod 43 is connected to the connecting block 42, and the top end of the support rod 43 slides through the fixed plate 35 and is connected to the piston 44. The seat shell 46 is fixedly arranged at the bottom of the valve seat 12, and the first flexible ring belt 47 is arranged on the inner circle of the seat shell 46 to form a second air chamber, preferably using a ring belt with good elasticity such as rubber, silicone, latex, etc. The bottom end of the stand pipe 45 is connected to the top end of the sleeve 41 , and the top end of the stand pipe 45 passes through the bottom of the seat shell 46 and is connected to the second air chamber.

[0053] When the electromagnet 22 is powered off and the reset spring 32 pushes the column block 31 to move upward, the column block 31 moving upward drives the top support rod 33 and the valve core 34 to move upward synchronously. The lower rod body 331 moving upward will also drive the connection block 42 to move upward. The connection block 42 moving upward drives the piston 44 to move upward through the support rod 43 to compress the water inside the sleeve 41. The compressed water inside the sleeve 41 enters the second air chamber formed between the seat shell 46 and the first flexible ring belt 47 through the riser 45. Since the inside of the second air chamber is pressurized, the first flexible ring belt 47 protrudes inwardly and contacts the second flexible ring belt 343 protruding outwardly, so that the second flexible ring belt 343 and the first flexible ring belt 47 have a better sealing effect, that is, the sealing effect of the protection valve is further improved when it is closed to cut off the sample water.

[0054] When the piston 44 moves upward, the water source above the fixed plate 35 will enter the sleeve 41 below the piston 44 through the small hole 48 located below the piston 44. When the pressure relief push rod 13 pushes against the valve core 34 to move downward and reset, the valve core 34 moving downward will drive the lower rod 331 to move downward, and the lower rod 331 moving downward will drive the piston 44 to move downward inside the sleeve 41 through the connecting block 42 and the support rod 43. The excess water source inside the sleeve 41 below the piston 44 will be discharged outward through the small hole 48. At this time, the water pressure inside the second air chamber is reduced, and the raised first flexible ring belt 47 is restored. The sealing auxiliary component 4 cooperates with the supporting and blocking component 3 to further enhance the sealing effect of the protection valve, and the sealing effect of the protection valve can be guaranteed for a long time during use.

[0055] It should be noted that the specific model and specifications of the electromagnet 22 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail. The power supply and principle of the electromagnet 22 are clear to those skilled in the art and will not be described in detail here.

[0056] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0057] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A protective valve for a water vapor sampling device of a thermal power generator set, characterized in that: include: A main valve assembly (1), the main valve assembly (1) comprising a valve body (11), a valve seat (12), a pressure relief push rod (13), a clamping nut (14), a valve stem (15) and a hand wheel (16), the valve seat (12) being arranged inside the valve body (11), the clamping nut (14) being mounted on the top of the valve body (11), the valve stem (15) being threadedly mounted on the clamping nut (14), the pressure relief push rod (13) being arranged at the bottom end of the valve stem (15), and the hand wheel (16) being mounted at the top end of the valve stem (15); A positioning assembly (2), the positioning assembly (2) comprising an outer cylindrical shell (21) and an electromagnet (22) having a cavity structure in the middle, the positioning assembly (2) being fixed to the bottom of the valve body (11), and the electromagnet (22) being installed inside the outer cylindrical shell (21); A support and plugging assembly (3), the support and plugging assembly (3) comprising a column block (31), a return spring (32), a top support rod (33), a valve core (34) and a fixed plate (35), the fixed plate (35) being fixedly arranged inside the outer cylinder shell (21), and the fixed plate (35) being located above the electromagnet (22), the column block (31) being fixed to the bottom end of the top support rod (33), the top end of the top support rod (33) being movable and penetrating through the bottom wall of the valve body (11), the valve core (34) being arranged at the top end of the top support rod (33), and the top support rod (33) supporting the valve core (34) and sealingly cooperating with the valve seat (12), the return spring (32) being arranged at the bottom end inside the outer cylinder shell (21) to elastically support the column block (31), the column block (31) being movable and penetrating through the cavity area in the middle of the electromagnet (22), and the column block (31) and the electromagnet (22) being magnetically attracted and cooperating; The valve core (34) comprises an upper cover plate (341), a lower cover plate (342) and a second flexible ring belt (343); the upper cover plate (341) is connected to the lower cover plate (342) via a support column (344); the second flexible ring belt (343) connects the outer edges of the upper cover plate (341) and the lower cover plate (342) to form a first air chamber; an upper tube (51) is fixed to the bottom of the lower cover plate (342); a vent hole (345) is provided on the lower cover plate (342) to connect the first air chamber and the upper tube (51); a lower tube (52) is fixedly provided above the fixed plate (35); and a hose (53) is provided to connect the bottom end of the upper tube (51) and the top end of the lower tube (52); The top support rod (33) comprises a lower rod body (331) and an upper rod body (332), wherein the upper rod body (332) is fixed above the lower rod body (331), the upper rod body (332) movably penetrates the fixing plate (35), and the top end of the upper rod body (332) is connected to the bottom end of the lower cover plate (342); A sealing auxiliary component (4), the sealing auxiliary component (4) comprising a sleeve (41), a connecting block (42), a support rod (43), a piston (44), a riser (45), a seat shell (46) and a first flexible ring belt (47), the connecting block (42) being located below the fixing plate (35), and the connecting block (42) being fixedly connected to the outer wall of the lower rod body (331), the bottom end of the sleeve (41) being fixedly arranged on the upper surface of the fixing plate (35), and the piston (44) being arranged on the sleeve (41). Inside, the bottom end of the support rod (43) is connected to the connecting block (42), and the top end of the support rod (43) slides through the fixing plate (35) and is connected to the piston (44), the seat shell (46) is fixedly arranged at the bottom of the valve seat (12), and the first flexible ring belt (47) is arranged on the inner ring of the seat shell (46) to form a second air chamber, the bottom end of the riser (45) is connected to the top end of the sleeve (41), and the top end of the riser (45) penetrates through the bottom of the seat shell (46) and is connected to the second air chamber.

2. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 1, characterized in that: A sealing ring (37) is provided in the middle of the fixing plate (35), and the upper rod body (332) movably penetrates the sealing ring (37).

3. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 2, characterized in that: A limiting ring plate (38) is provided at the bottom of the sealing ring (37), and the limiting ring plate (38) is fixedly connected to the fixing plate (35) by means of bolts.

4. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 1, characterized in that: The column block (31) is fixedly sleeved outside the lower rod body (331).

5. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 1, characterized in that: The outer cylinder shell (21) comprises a cylinder shell (211) and a bottom cover (212); the top end of the cylinder shell (211) is fixedly connected to the bottom of the valve body (11); and the bottom cover (212) is detachably arranged at the bottom end of the cylinder shell (211).

6. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 5, characterized in that: The support and blocking assembly (3) further comprises a limiting column (36), the bottom end of the limiting column (36) being fixed to the upper surface of the bottom cover (212), and the return spring (32) being sleeved on the outside of the limiting column (36).

7. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 1, characterized in that: The positioning assembly (2) further comprises a lower limiting ring (23), wherein the lower limiting ring (23) is arranged at the bottom of the return spring (32), and the lower limiting ring (23) is fixedly connected to the outer cylinder shell (21).

8. A protection valve for a water vapor sampling device of a thermal power generator set according to claim 7, characterized in that: The positioning assembly (2) further comprises an upper limit ring (24), wherein the upper limit ring (24) is arranged on the top of the return spring (32), and the upper limit ring (24) is fixedly connected to the outer cylinder shell (21).

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