Safety valve for steam generator

Abstract

The utility model discloses a safety valve for a steam generator, and belongs to the technical field of safety valves. Comprising a valve body, one end of the valve body is connected with a valve seat, an air inlet is formed in the bottom of the valve seat, an exhaust port is formed in the side wall of the valve body, the valve body is connected with an exhaust pipe through the exhaust port, and a U-shaped pipe and a self-heating assembly are sequentially arranged on the exhaust pipe in the exhaust direction. According to the technical scheme, the structure of the safety valve exhaust pipe is improved, the safety valve opening pressure increase caused by condensed water is avoided, and the system safety is improved.

Description

Technical Field

[0001] This application relates to the field of safety valve technology, and in particular to a safety valve for a steam generator. Background Technology

[0002] Safety valves for steam generators are a common safety device in industry. They can automatically open and close according to the working pressure of the steam medium. In the event of abnormal overpressure in the system, they can automatically open to discharge the overpressure steam in a timely manner, thereby protecting the normal operation of the system and preventing serious safety accidents such as explosions or equipment damage caused by overpressure.

[0003] When the safety valve of a steam generator is open, it discharges steam, which easily condenses into water. Because the exhaust pipe of the safety valve for a steam generator is generally installed vertically upwards, the condensate cannot be discharged smoothly and tends to accumulate in the exhaust pipe, creating back pressure. This increases the opening pressure of the safety valve, posing a safety hazard to the entire system. Utility Model Content

[0004] The purpose of this application is to provide a safety valve for a steam generator, which improves the structure of the safety valve exhaust pipe, avoids the increase in safety valve opening pressure caused by condensate, and improves the safety of the system.

[0005] This application provides a safety valve for a steam generator, which adopts the following technical solution: it includes a valve body, one end of which is connected to a valve seat, the bottom of which is provided with an air inlet, the side wall of which is provided with an exhaust port and connected to an exhaust pipe through the exhaust port, and a U-shaped pipe for collecting condensate and a self-heating component for maintaining steam temperature are sequentially provided on the exhaust pipe along the exhaust direction.

[0006] By adopting the above technical solution, the air inlet at the bottom of the valve seat is connected to the medium inside the steam generator. When the medium inside the steam generator is overpressurized, the safety valve automatically opens, and steam is injected from the exhaust port of the valve body into the exhaust pipe, and finally discharged from the exhaust port of the exhaust pipe. During the steam transmission through the exhaust pipe, due to the low pipe wall temperature at the front end of the exhaust pipe, a small portion of the steam condenses on the pipe wall. However, because a U-shaped tube is provided at the front end of the exhaust pipe, this small portion of condensate is collected under the action of gravity and flows into the bottom end of the U-shaped tube for final discharge, preventing condensate from flowing back into the exhaust pipe and creating back pressure, which would affect the opening of the safety valve. During the steam transmission through the exhaust pipe, most of the steam flows through the U-shaped tube and enters the vertical section at the rear end of the pipeline. A self-heating component is provided on the vertical section to increase the pipe wall temperature, maintaining the steam temperature and preventing steam from condensing on the pipe wall, thus allowing the steam to be discharged from the exhaust port of the exhaust pipe. Even if too much steam is released at any moment, causing some steam to condense in the vertical section of the pipeline, the condensate will still be collected and discharged by the U-shaped pipe under the influence of gravity, since the vertical section is higher than the U-shaped pipe section, thus ensuring the safe operation of the steam generator.

[0007] Optionally, a water collection trough is provided at the bottom of the U-shaped pipe.

[0008] By adopting the above technical solution, the excessive condensate accumulation at the bottom of the U-shaped pipe is avoided, which would reduce the flow cross-section of the pipe and affect the steam discharge.

[0009] Optionally, the water collection tank is lined with filler.

[0010] By adopting the above technical solution, steam is prevented from being directly ejected from the water collection tank. In addition, the gaps between the packing materials do not affect the flow of condensate into the water collection tank and its collection at the bottom.

[0011] Optionally, a drain pipe is provided at the bottom of the water collection tank.

[0012] By adopting the above technical solution, the condensate collected at the bottom of the water collection tank is discharged into the exhaust pipe, thus avoiding the accumulation of condensate in the exhaust pipe and affecting the steam flow.

[0013] Optionally, the self-heating component includes a housing that wraps around the outer wall of the exhaust pipe and has a cavity, in which a heating pipe and a heat transfer medium are disposed.

[0014] By adopting the above technical solution, the heating tube heats the pipe and transfers the heat to the exhaust pipe wall through the heat transfer medium. The vertical section of the exhaust pipe is heated, which reduces the temperature difference between the pipe wall and the steam, making it less likely for the steam to condense on the pipe wall and be discharged from the exhaust pipe.

[0015] Optionally, the self-heating component also includes a remote control switch, and a pressure sensor is provided on the side wall of the valve body. The remote control switch receives the pressure sensor signal to control the heating tube to turn on or off.

[0016] By adopting the above technical solution, when the safety valve opens, steam enters the valve body. The pressure sensor receives a signal indicating an increase in the gas pressure inside the valve body and sends a signal to the remote control switch to activate the heating element. The self-heating component then operates, the downstream section of the exhaust pipe is heated, and the steam transmitted to the vertical section of the pipeline is discharged. When the medium inside the steam generator returns to normal gas pressure, the safety valve closes, the steam is cut off, the pressure sensor receives a signal indicating a decrease in the gas pressure inside the valve body and sends a signal to the remote control switch to deactivate the heating element. The self-heating component stops operating, reducing energy consumption.

[0017] Optionally, the valve body is provided with a valve core, valve stem, spring, adjusting screw and handle. The two ends of the spring abut against the valve stem and adjusting screw. One end of the valve stem is subjected to the spring force to abut the valve core against the valve seat. The other end passes through the center hole of the adjusting screw and is connected to the handle. The adjusting screw is threaded to the valve body and its upper end is fastened to the valve body by a lock nut.

[0018] By adopting the above technical solution, the spring force is adjusted to the set pressure of the safety valve using an adjusting screw. During normal operation, the spring force is greater than the force exerted by the medium inside the steam generator on the valve core, and the safety valve is normally closed. When the pressure inside the steam generator reaches or exceeds the set pressure, the force of the medium acting on the valve core overcomes the spring force, causing the valve core to open and the medium to be quickly discharged, thereby reducing the system pressure. As the steam generator pressure decreases, the spring force presses the valve core back onto the valve seat, closing the valve and achieving automatic opening and closing of the safety valve. When the safety valve malfunctions and cannot open automatically, pushing the handle upwards moves the valve stem upwards, compressing the spring and opening the valve core to release pressure, thus manually opening the safety valve for the steam generator.

[0019] Optionally, a spring seat is provided at the point where the spring abuts against the valve stem, and a guide sleeve is provided at the point where the spring abuts against the adjusting screw.

[0020] By adopting the above technical solution, the alignment of the valve core, valve stem and spring is improved, and the misalignment of the three components during reciprocating motion within the valve body is prevented, thus avoiding any impact on the valve's sealing performance.

[0021] Optionally, the valve core is provided with an upwardly extending flange, and a bushing is provided between the flange and the opposite surface of the valve body.

[0022] By adopting the above technical solution, on the one hand, the valve core slides more smoothly up and down on the inner wall of the valve body, and on the other hand, the bushing also seals the gap between the valve core and the valve body, preventing steam from entering the valve body at the upper end of the valve when the valve is opened, thus affecting the normal operation of the valve's internal components.

[0023] Optionally, an adjusting ring is threadedly connected to the outer circumference of the valve seat's valve port.

[0024] By adopting the above technical solution, the distance between the regulating ring and the lower section of the valve core can be controlled by rotating the regulating ring up or down, thereby adjusting the steam injection speed when the valve is opened.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The design incorporates a U-shaped pipe and a water collection tank to effectively collect and discharge condensate, preventing back pressure from forming in the exhaust pipe and ensuring the safety valve opens at the set pressure, thus guaranteeing safe system operation. Increasing the pipe wall temperature through heating pipes and heat transfer medium reduces steam condensation, further ensuring smooth steam discharge and preventing abnormal increases in opening pressure due to condensate accumulation, thereby enhancing the reliability of the safety valve.

[0027] 2. The remote control switch is linked to the pressure sensor to achieve automatic control of the heating element. Heating is automatic when the safety valve opens and automatically stopped when it closes, ensuring smooth steam discharge and preventing energy waste, resulting in significant energy savings. In case of automatic control failure, the safety valve can be manually opened via the handle to release pressure promptly, providing double protection for operation and enhancing the system's reliability and practicality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a safety valve for a steam generator.

[0029] Figure 2 yes Figure 1 A magnified view of part a;

[0030] Figure 3 This is a schematic diagram of the self-heating component.

[0031] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Exhaust port; 12. Pressure sensor; 2. Valve seat; 21. Air inlet; 22. Adjusting ring; 3. Exhaust pipe; 31. U-shaped pipe; 311. Water collection tank; 312. Packing; 313. Drain pipe; 32. Self-heating component; 321. Housing; 322. Heating tube; 323. Heat transfer medium; 324. Remote control switch; 4. Valve core; 41. Flange; 42. Bushing; 5. Valve stem; 51. Guide sleeve; 6. Spring; 61. Spring seat; 7. Adjusting screw; 71. Locking nut; 8. Handle. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0033] This application discloses a safety valve for a steam generator.

[0034] like Figure 1 As shown, a safety valve for a steam generator includes a valve body 1. The bottom end of the valve body 1 is connected to a valve seat 2 via a thread. The bottom of the valve seat 2 is provided with an air inlet 21 and is connected to the internal medium of the steam generator via a thread. The side wall of the valve body 1 is provided with an exhaust port 11 and is connected to an exhaust pipe 3 via the exhaust port 11. When the valve is opened, steam is discharged along the air inlet 21 of the valve seat 2, the exhaust port 11 of the valve body 1 and the exhaust pipe 3. A U-shaped pipe 31 and a self-heating component 32 are sequentially provided on the exhaust pipe 3 along the exhaust direction.

[0035] like Figure 2 As shown in the preferred embodiment of this application, the U-shaped pipe 31 has a water collection trough 311 at its bottom, and the water collection trough 311 is lined with packing material 312. A drain pipe 313 is also provided at the bottom of the water collection trough 311. The water collection trough 311 is located at the bottom of the U-shaped pipe 31 to collect condensate accumulated in the U-shaped pipe 31, preventing condensate from clogging the bottom of the U-shaped pipe 31 and reducing the flow cross-section of the pipe, thus affecting steam discharge. The packing material 312 in the water collection trough 311 prevents steam from being directly ejected from the water collection trough 311, while the gaps between the packing material 312 do not affect the inflow of condensate and its collection at the bottom of the water collection trough 311. The drain pipe 313 at the bottom of the water collection trough 311 discharges the condensate collected at the bottom of the water collection trough 311, preventing condensate from accumulating in the exhaust pipe 3 and affecting steam flow.

[0036] like Figure 3 As shown, in a preferred embodiment of this application, the self-heating component 32 includes a housing 321, which is wrapped around the outer wall of the exhaust pipe 3 and has a cavity. The cavity contains a heating tube 322 and a heat transfer medium 323. The self-heating component 32 also includes a remote control switch 324. A pressure sensor 12 is provided on the side wall of the valve body 1. The remote control switch 324 receives the signal from the pressure sensor 12 to control the heating tube 322 to open or close.

[0037] When the safety valve opens, steam enters the valve body 1. The pressure sensor 12 receives a signal indicating an increase in the internal pressure of the valve body 1 and sends a signal to the remote control switch 324 to activate the heating element 322. The heating element 322 heats the exhaust pipe 3 and transfers the heat to the pipe wall through the heat transfer medium 323. The vertical section of the exhaust pipe 3 is heated, reducing the temperature difference between the pipe wall and the steam, making it easier for the steam in the vertical section to be discharged. When the medium in the steam generator returns to normal pressure, the safety valve closes, the steam is cut off, the pressure sensor 12 receives a signal indicating a decrease in the internal pressure of the valve body 1 and sends a signal to the remote control switch 324 to deactivate the heating element 322. The self-heating component 32 stops working, reducing energy consumption during the exhaust process.

[0038] It is worth mentioning that if condensate comes into contact with spring 6 during the opening of the safety valve, it may cause corrosion of spring 6, reducing its elasticity and lifespan, thus affecting the normal operation of the safety valve. Simultaneously, the presence of condensate will cause spring 6 to become damp, leading to a change in its elastic coefficient and affecting the opening and closing pressures of the safety valve. To avoid the above situations, such as... Figure 1 As shown, the valve core 4 has an upwardly extending flange 41, and a bushing 42 is provided between the flange 41 and the opposite surface of the valve body 1. The bushing 42 seals the gap between the valve core 4 and the valve body 1, preventing steam from entering the valve body 1 at the upper end of the valve when the valve is opened, thus avoiding affecting the normal operation of internal valve components such as the spring 6, valve stem 5, and adjusting screw 7. At the same time, the bushing 42 makes the valve core 4 slide more smoothly up and down on the inner wall of the valve body 1, improving the service life of the valve.

[0039] The working principle of the safety valve for the steam generator in this application is as follows:

[0040] When the medium inside the steam generator experiences overpressure, the safety valve automatically opens, and steam is injected from the exhaust port 11 of valve body 1 into the exhaust pipe 3, and finally discharged from the exhaust port 11 of exhaust pipe 3. During this process, due to the lower temperature of the pipe wall at the front end of exhaust pipe 3, a small portion of the steam condenses on the pipe wall. This condensate is collected under the influence of gravity and flows into the bottom end of U-shaped tube 31 before being discharged. Most of the steam flows through U-shaped tube 31 and enters the vertical section at the rear of the pipeline. This section is equipped with a self-heating component 32 that can increase the pipe wall temperature, maintaining the steam temperature and preventing condensation on the pipe wall, thus allowing the steam to be discharged from the exhaust port of exhaust pipe 3. Even if there is a momentary surge of steam causing condensation in the vertical section of the pipeline, the condensate is still collected and discharged by U-shaped tube 31 under the influence of gravity, ensuring the safe operation of the steam generator.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety valve for a steam generator, characterized by: The utility model provides a valve, including valve body (1), one end of valve body (1) is connected with valve seat (2), the bottom of valve seat (2) is equipped with air inlet (21), the lateral wall of valve body (1) is equipped with exhaust port (11) and is connected with exhaust pipe (3) through exhaust port (11), the exhaust pipe (3) along the exhaust direction is equipped with U -shaped pipe (31) and self -heating component (32) in proper order.

2. A safety valve for use in a steam generator according to claim 1, characterized in that: The bottom of the U-shaped pipe (31) is provided with a water collecting groove (311).

3. A safety valve for use in a steam generator according to claim 2, characterized in that: The water collecting groove (311) is paved with a filler (312).

4. A safety valve for use in a steam generator according to claim 3, characterized in that: The bottom of the water collecting groove (311) is provided with a drain pipe (313).

5. The safety valve for a steam generator according to claim 1, wherein: The self-heating component (32) includes a shell (321) that is wrapped around the outer wall of the exhaust pipe (3) and leaves a cavity, and the cavity is provided with a heating pipe (322) and a heat transfer medium (323).

6. A safety valve for use in a steam generator according to claim 5, characterized in that: The self-heating component (32) further includes a remote control switch (324), and the lateral wall of the valve body (1) is provided with a pressure sensor (12), and the remote control switch (324) receives the signal of the pressure sensor (12) to control the opening or closing of the heating pipe (322).

7. A safety valve for use in a steam generator according to claim 1, characterized in that: The valve body (1) is provided with a valve core (4), a valve rod (5), a spring (6), an adjusting screw (7) and a handle (8), the ends of the spring (6) abut against the valve rod (5) and the adjusting screw (7), one end of the valve rod (5) is abutted against the valve core (4) by the spring force of the spring (6), the other end of the valve core (4) passes through the center hole of the adjusting screw (7) and is connected with the handle (8), the adjusting screw (7) is threadedly connected with the valve body (1) and the upper end is tightly connected with the valve body (1) through a locking nut (71).

8. A safety valve for use in a steam generator according to claim 7, characterized in that: The abutting place of the spring (6) and the valve rod (5) is provided with a spring seat (61), and the abutting place of the spring (6) and the adjusting screw (7) is provided with a guide sleeve (51).

9. A safety valve for use in a steam generator according to claim 7, characterized in that: The valve core (4) is provided with an upwardly extending flange (41), and a bushing (42) is arranged between the flange (41) and the opposite surface of the valve body (1).

10. The safety valve for a steam generator according to claim 1, characterized in that: The outer circle of the valve port of the valve seat (2) is threadedly connected with an adjusting ring (22).

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