High-temperature steam trap

Abstract

The utility model relates to the technical field of steam valves, in particular to a high-temperature steam trap valve which comprises a valve seat, a valve cover, a valve core, a valve rod and a driving mechanism, a Y-shaped channel is arranged in the valve seat and comprises a horizontal flow channel, a first inclined flow channel and a second inclined flow channel, the horizontal flow channel is communicated with the first inclined flow channel, and the second inclined flow channel is communicated with the second inclined flow channel. The end, close to the horizontal runner, of the second inclined runner is higher than the horizontal runner and communicates with the side wall of the first inclined runner, and the end, away from the horizontal runner, of the second inclined runner is flush with the horizontal runner; the valve element is arranged at the end, close to the horizontal flow channel, of the first inclined flow channel in a sliding and sealing mode, a conical sealing face and a throttling face are arranged on the first inclined flow channel, the valve element comprises a conical section and a cylindrical section, the conical section is used for being connected with the sealing face of the first inclined flow channel in a sliding and sealing mode, and the cylindrical section is used for being connected with the throttling face in a sliding mode. The drain valve can solve the technical problems that an existing drain valve is poor in sealing performance and service life under the working conditions of high temperature and high pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam valve technical field, concretely is high temperature steam trap. BACKGROUND

[0002] In the modern industrial system, the steel plant of metallurgical industry as the key link of basic material production, its production process highly depends on the efficient and stable energy supply system. And steam as a kind of widely used high-quality heat source, plays an irreplaceable role in the numerous process flows of steel plant;Among them, in the stable operation of steam system, steam trap plays a key role, and its performance directly affects the utilization efficiency of steam, the normal operation of equipment and the continuity and safety of production.

[0003] However, the steam trap used in the current steel plant has many problems in sealing performance and service life when facing high temperature (300-400 DEG C) and high pressure extreme working conditions. On the one hand, the steam scouring force under high temperature and high pressure is very strong, and the ordinary sealing structure cannot withstand long-term impact, resulting in serious wear of the sealing surface, which further aggravates steam leakage. On the other hand, high temperature and high pressure steam is prone to cavitation and erosion phenomenon. When steam passes through the trap, the bubbles produced by the instantaneous change of pressure will produce strong impact force on the key components such as valve seat and valve core in the breaking process. After a long time, the surface of the components appears pitting, pit, and even large area damage, greatly shortening the service life of the trap.

[0004] In order to solve the above problems, some manufacturers try to improve the existing trap, such as increasing the number of sealing layers, replacing higher strength metal materials, etc. But these improvement measures can only alleviate the problem to a certain extent, and cannot fundamentally solve the sealing and service life problem of steam trap under high temperature and high pressure working condition. Therefore, the inventor of our company has developed a new type of high temperature steam trap which can adapt to the harsh working environment of steel plant, improve the sealing performance and service life, and become the key demand of metallurgical industry to improve production efficiency and reduce cost, which has important significance for promoting the sustainable development of steel industry. INVENTION CONTENTS

[0005] The utility model provides high temperature steam trap can solve the technical problem of poor sealing performance and service life of existing trap under high temperature and high pressure working condition.

[0006] The present application provides the following technical solutions:

[0007] The high-temperature steam trap comprises a valve seat, a valve cover, a valve core, a valve rod and a driving mechanism, the valve seat is internally provided with a Y-shaped channel, the Y-shaped channel comprises a horizontal flow channel, a first inclined flow channel and a second inclined flow channel, the horizontal flow channel is communicated with the first inclined flow channel, one end of the second inclined flow channel close to the horizontal flow channel is higher than the horizontal flow channel and is communicated with the side wall of the first inclined flow channel, and the other end of the second inclined flow channel away from the horizontal flow channel is flush with the horizontal flow channel; the valve core is slidingly and sealingly arranged at one end of the first inclined flow channel close to the horizontal flow channel, and the valve core is lower than the other end of the second inclined flow channel connected with the first inclined flow channel, a tapered sealing surface and a throttling surface are arranged on the first inclined flow channel, and the valve core comprises a tapered section and a cylindrical section, the tapered section is used for slidingly and sealingly connecting with the sealing surface of the first inclined flow channel, and the cylindrical section is used for slidingly connecting with the throttling surface.

[0008] Technical principles and beneficial effects:

[0009] 1. The sealing surface and the throttling surface are separated, so that the functions of the two are independent, the throttling surface mainly bears the scouring and friction of fluid flow, and the sealing surface is responsible for the sealing work when the valve is closed. In the traditional steam trap, the sealing surface bears the throttling and sealing functions at the same time, and frequent fluid scouring can accelerate the wear of the sealing surface, resulting in a decrease in sealing performance. In the steam trap of the application, the throttling surface bears most of the scouring and wear, and the sealing surface is protected, so that the sealing surface can better maintain flatness and smoothness in long-term use, thereby ensuring the reliability of sealing, reducing steam leakage and improving energy utilization efficiency.

[0010] 2. In the flow process of steam and condensed water, the horizontal flow channel can keep the relative stable flow rate and flow direction of the fluid when entering and leaving the steam trap, and reduce the pressure fluctuation and energy loss caused by sudden turning or dramatic change of flow rate; the first inclined flow channel plays a role in guiding the fluid to flow from the horizontal flow channel to a specific direction, so that the fluid can be orderly distributed when entering the valve core area, and the conditions of fluid turbulence and local pressure concentration are avoided; when the fluid flows from the first inclined flow channel into the second inclined flow channel, due to the change of flow channel height, a certain resistance is generated, thereby playing a role in adjusting the fluid pressure and flow rate. The design and layout of the above flow channels can effectively avoid the generation of too high pressure impact of the fluid in the steam trap, which is beneficial to protect the valve parts and improve the service life of the valve.

[0011] 3. The high-temperature steam trap of the application has two uses according to different use conditions, that is, the horizontal flow channel can be used as a water inlet flow channel or a water outlet flow channel. In particular, when the horizontal flow channel is used as a water outlet flow channel, the tapered section of the valve core and the first inclined flow channel has a self-internal pressure sealing effect, the greater the pressure difference, the tighter the contact between the valve core and the sealing surface, and the better the sealing performance.

[0012] Furthermore, the drive mechanism includes a connecting bracket and a pneumatic actuator. The connecting bracket is used to connect the valve cover and the pneumatic actuator, and the pneumatic actuator is electrically connected to a controller. The valve stem is slidably mounted on the valve cover, and one end of the valve stem is connected to the pneumatic actuator, while the other end is connected to the valve core.

[0013] Beneficial effect: The pneumatic actuator receives signals from the controller to control the valve stem to slide on the valve cover, thereby controlling the valve core to open and close the first inclined flow channel.

[0014] Furthermore, a valve position marking area is provided on the connecting bracket, and a valve position pointer is provided on the valve stem, with the valve position pointer pointing towards the valve position marking area and extending onto the valve position marking area.

[0015] Beneficial effects: The valve position pointer, in conjunction with the valve position indicator area, allows operators to intuitively and accurately obtain real-time valve opening information. Furthermore, the clear valve opening display facilitates quick troubleshooting of steam trap malfunctions. When system anomalies occur, such as steam leaks or poor drainage, operators can first check the valve opening to determine if it's due to incorrect valve opening or closing. If the valve position pointer indicates an opening different from expected, further inspection of components such as the valve stem and valve core for jamming or wear can be conducted, thus shortening troubleshooting time, improving maintenance efficiency, reducing equipment downtime, and minimizing production impact.

[0016] Furthermore, a high-temperature and high-pressure packing layer is provided on the side of the valve cover near the connecting bracket, and the high-temperature and high-pressure packing layer slides in contact with the valve stem.

[0017] Beneficial effects: Under high temperature and high pressure conditions, steam is very easy to leak from the gap between the valve stem and the valve cover. The high temperature and high pressure packing layer fits tightly against the valve stem, forming a reliable sealing barrier, effectively preventing steam from overflowing, ensuring the sealing performance of the steam trap, and reducing energy waste and safety hazards caused by steam leakage.

[0018] Furthermore, several heat dissipation fins are provided on the outer wall of the valve cover near the valve seat.

[0019] Beneficial effects: The heat dissipation fins reduce the valve cover temperature by dissipating heat in a timely manner, which helps to extend the overall service life of the steam trap and reduce equipment maintenance and replacement costs.

[0020] Furthermore, the aperture of the first inclined flow channel is larger than that of the horizontal flow channel and the second inclined flow channel.

[0021] Beneficial effects:

[0022] 1. The first inclined flow channel, as a key component connecting the horizontal and second inclined flow channels, has a larger orifice diameter that effectively reduces fluid velocity and pressure loss. When steam and condensate enter the first inclined flow channel from the horizontal flow channel, the increased cross-sectional area of ​​the channel reduces the fluid velocity, which helps to reduce the scouring of the pipe wall and lower energy loss. Simultaneously, the lower velocity also helps prevent cavitation, avoiding damage to the internal components of the steam trap and ensuring stable operation.

[0023] 2. A larger orifice diameter allows for a more uniform distribution of fluid impact force on the valve core during opening and closing, reducing valve core vibration and wear, and improving the sealing performance and service life of the steam trap.

[0024] Furthermore, the hardness of the valve core is higher than that of the valve seat.

[0025] Beneficial effects:

[0026] 1. The valve core has high hardness, which better maintains its shape and surface flatness during frequent opening and closing. Even when subjected to the scouring and impact of steam and condensate, it is not prone to deformation or wear, and always maintains a tight fit with the valve seat, effectively preventing steam leakage. In high-temperature and high-pressure environments, if the valve core is not hard enough, even a small deformation may lead to poor sealing, while a high-hardness valve core can ensure the reliability of the seal and improve steam utilization efficiency.

[0027] 2. When the steam trap is working, there is friction and impact between the valve core and the valve seat. The valve core has high hardness, which can reduce its own wear. At the same time, the valve seat has relatively low hardness and a certain degree of flexibility. When it comes into contact with the valve core, it can play a buffering role, absorb some of the impact force, and reduce the damage to the valve core. In this way, the service life of the valve core is extended.

[0028] Furthermore, the valve seat is made of chromium-molybdenum alloy steel.

[0029] Beneficial effects: Chromium-molybdenum alloy steel has good high-temperature resistance and can maintain structural and performance stability in environments of 300-400℃, preventing deformation due to high temperature from affecting the seal; it has strong high-pressure resistance and can withstand high steam pressure, avoiding cracking or deformation that could lead to seal failure; it is wear-resistant and corrosion-resistant, and can resist the scouring of steam and condensate and the erosion of corrosive substances, extending its service life. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the high-temperature steam trap of this utility model. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method:

[0032] The markings in the accompanying drawings include: valve seat 1, horizontal flow channel 11, first inclined flow channel 12, second inclined flow channel 13, valve core 2, sealing surface 121, throttling surface 122, valve stem 3, valve cover 4, high temperature and high pressure packing layer 41, heat dissipation fins 42, connecting bracket 5, valve position marking area 51, valve position pointer 52, pneumatic actuator 6, and manual device 61.

[0033] Example 1

[0034] like Figure 1 As shown, the high-temperature steam trap includes a valve seat 1, a valve cover 4, a valve core 2, a valve stem 3, and a drive mechanism. The valve seat 1 is provided with a Y-shaped channel, which includes a horizontal flow channel 11, a first inclined flow channel 12, and a second inclined flow channel 13. The horizontal flow channel 11 is connected to the first inclined flow channel 12. The end of the second inclined flow channel 13 near the horizontal flow channel 11 is higher than the horizontal flow channel 11 and is connected to the side wall of the first inclined flow channel 12. The end of the second inclined flow channel 13 away from the horizontal flow channel 11 is flush with the horizontal flow channel 11. In use, the free ends of the horizontal flow channel 11 and the second inclined flow channel 13 are connected to the steam pipeline. According to the specific working conditions, the horizontal flow channel 11 can be used as both the inlet and outlet, that is, the steam trap can be used for left inlet and right outlet or right inlet and left outlet.

[0035] The valve core 2 is slidably and sealingly disposed at one end of the first inclined flow channel 12 near the horizontal flow channel 11, and the valve core 2 is lower than the end of the second inclined flow channel 13 connected to the first inclined flow channel 12. The first inclined flow channel 12 is provided with a conical sealing surface 121 and a throttling surface 122. The valve core 2 includes a conical section and a cylindrical section. The conical section is used for slidably sealing with the sealing surface 121 of the first inclined flow channel 12, and the cylindrical section is used for slidably connecting with the throttling surface 122. By separating the sealing surface 121 and the throttling surface 122, their functions are independent. The throttling surface 122 mainly bears the scouring and friction during fluid flow, while the sealing surface 121 is responsible for sealing when the valve is closed. Because the throttling surface 122 bears most of the scouring and wear, it protects the sealing surface 121, allowing the sealing surface 121 to better maintain its flatness and smoothness during long-term use, thereby ensuring the reliability of the seal, reducing steam leakage, and improving energy efficiency.

[0036] More preferably, in this embodiment, the orifice diameter of the first inclined flow channel 12 is larger than that of the horizontal flow channel 11 and the second inclined flow channel 13. On the one hand, the larger orifice diameter can effectively reduce the fluid flow rate and reduce pressure loss. On the other hand, the larger orifice diameter can make the fluid impact force on the valve core 2 more evenly distributed when it is opened and closed, reduce the vibration and wear of the valve core 2, and improve the sealing performance and service life of the steam trap.

[0037] The drive mechanism includes a connecting bracket 5 and a pneumatic actuator 6. The connecting bracket 5 connects the valve cover 4 and the pneumatic actuator 6, which is electrically connected to a controller. The valve stem 3 is slidably mounted on the valve cover 4, with one end connected to the pneumatic actuator 6 and the other end connected to the valve core 2. In this embodiment, the pneumatic actuator 6 is the actuator used in existing valves, and a manual device 61 is also provided on the pneumatic actuator 6, as specifically shown in the valve drive device disclosed in the prior art CN205781950U, a Y-type high-temperature and high-pressure steam trap, which will not be described in detail here.

[0038] In this embodiment, a valve position marking area 51 is provided on the connecting bracket 5, and a valve position pointer 52 is provided on the valve stem 3. The valve position pointer 52 faces the valve position marking area 51 and extends onto the valve position marking area 51. Specifically, in this embodiment, a scale mark is provided on the valve position marking area 51, and the valve position pointer 52 cooperates with the valve position marking area 51, allowing the operator to intuitively and accurately obtain the real-time opening information of the valve. A high-temperature and high-pressure packing layer 41 is provided on the side of the valve cover 4 near the connecting bracket 5, and the high-temperature and high-pressure packing layer 41 slides in contact with the valve stem 3. When the valve stem 3 moves, the high-temperature and high-pressure packing layer 41 tightly fits the valve stem 3, forming a reliable sealing barrier, effectively preventing steam leakage and ensuring the sealing performance of the steam trap. Several heat dissipation fins 42 are provided on the outer wall of the end of the valve cover 4 near the valve seat 1. The heat dissipation fins 42 reduce the temperature of the valve cover 4 by timely heat dissipation, which helps to extend the overall service life of the steam trap and reduce equipment maintenance and replacement costs.

[0039] In use, the high-temperature steam trap of this application is installed in the steam pipeline, and the pneumatic actuator 6 is electrically connected to the controller. A pressure sensor is installed in the steam pipeline. The pressure sensor monitors the pressure in the pipeline in real time. When the pressure reaches the preset value, it sends a signal to the controller. After receiving the signal, the controller controls the pneumatic actuator 6 to move, thereby driving the valve stem 3 to move, so that the valve core 2 opens the valve and discharges the cooling water in the pipeline.

[0040] Example 2

[0041] The difference between this embodiment and Embodiment 1 is that the valve core 2 and valve seat 1 are made of different high-temperature and high-pressure resistant materials, and the hardness of the valve core 2 is higher than that of the valve seat 1. On the one hand, using different materials can effectively avoid the problem of two identical materials sticking together under high-temperature conditions; on the other hand, the high hardness of the valve core 2 allows it to better maintain its shape and surface flatness during frequent opening and closing. Even when subjected to the scouring and impact of steam and condensate, it is not prone to deformation or wear, and always maintains a tight fit with the valve seat 1, effectively preventing steam leakage. At the same time, there is friction and impact between the valve core 2 and the valve seat 1. The high hardness of the valve core 2 reduces its own wear; while the relatively low hardness of the valve seat 1 provides a certain degree of flexibility, which can act as a buffer when in contact with the valve core 2, absorbing some of the impact force and reducing damage to the valve core 2. In this way, the service life of the valve core 2 is extended.

[0042] Specifically, valve seat 1 is made of chromium-molybdenum steel, and the surface of valve core 2 can be hardened. Chromium-molybdenum steel has good high temperature resistance and can maintain structural and performance stability in an environment of 300-400℃, preventing deformation due to high temperature from affecting the seal. It has strong high pressure resistance and can withstand high steam pressure, avoiding cracking or deformation that could lead to seal failure.

[0043] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-temperature steam trap, comprising a valve seat, a valve cover, a valve core, a valve stem, and a drive mechanism, characterized in that, The valve seat is provided with a Y-shaped channel, which includes a horizontal flow channel, a first inclined flow channel, and a second inclined flow channel. The horizontal flow channel is connected to the first inclined flow channel. The end of the second inclined flow channel near the horizontal flow channel is higher than the horizontal flow channel and is connected to the side wall of the first inclined flow channel. The end of the second inclined flow channel away from the horizontal flow channel is flush with the horizontal flow channel. The valve core is slidably and sealingly disposed at the end of the first inclined flow channel near the horizontal flow channel, and the valve core is lower than the end of the second inclined flow channel connected to the first inclined flow channel. The first inclined flow channel is provided with a conical sealing surface and a throttling surface. The valve core includes a conical section and a cylindrical section. The conical section is used for slidably and sealingly connecting with the sealing surface of the first inclined flow channel, and the cylindrical section is used for slidably connecting with the throttling surface.

2. The high-temperature steam trap according to claim 1, characterized in that: The drive mechanism includes a connecting bracket and a pneumatic actuator. The connecting bracket is used to connect the valve cover and the pneumatic actuator, and the pneumatic actuator is electrically connected to a controller. The valve stem is slidably mounted on the valve cover, with one end of the valve stem connected to the pneumatic actuator and the other end connected to the valve core.

3. The high-temperature steam trap according to claim 2, characterized in that: The connecting bracket is provided with a valve position marking area, and the valve stem is provided with a valve position pointer, which points towards the valve position marking area and extends to the valve position marking area.

4. The high-temperature steam trap according to claim 3, characterized in that: The valve cover is provided with a high-temperature and high-pressure packing layer on the side near the connecting bracket, and the high-temperature and high-pressure packing layer slides in contact with the valve stem.

5. The high-temperature steam trap according to claim 4, characterized in that: Several heat dissipation fins are provided on the outer wall of the valve cover near the valve seat.

6. The high-temperature steam trap according to any one of claims 1-5, characterized in that: The aperture of the first inclined flow channel is larger than that of the horizontal flow channel and the second inclined flow channel.

7. The high-temperature steam trap according to claim 6, characterized in that: The hardness of the valve core is higher than that of the valve seat.

8. The high-temperature steam trap according to claim 7, characterized in that: The valve seat is made of chromium-molybdenum alloy steel.

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