A high temperature and high pressure resistant tightly sealed steam throttle valve

Abstract

The present invention relates to the technical field of throttle valves, specifically a high temperature and high pressure resistant tightly sealed steam throttle valve, the throttle valve comprising a valve body, an actuator, a valve cover, and an inlet section, one end of the valve body is connected to the inlet section, the valve cover is connected to the top of the valve body, the actuator is mounted on the valve cover and penetrates into the valve body, the actuator opens or closes the flow channel in the valve body, and a boosting structure is provided in the inlet section. The inlet section comprises an expansion cylinder, which is thick in the middle and thin at both ends, one end of the expansion cylinder serves as the inlet of the throttle valve, and the other end of the expansion cylinder is connected to the valve body. By adding an inlet expansion section before the throttling position of the throttle valve, the steam medium portion that is closer to the state of the condensate generation point will be liquefied first, and the medium will subsequently flow into the throttling position, only less condensate will be generated, and it is not easy for a large amount of heat to accumulate at the sealing surface.

Description

Technical Field

[0001] The invention relates to the technical field of throttle valves, in particular to a high-temperature and high-pressure resistant tightly sealed steam throttle valve. Background Art

[0002] Steam pipeline transportation systems use a large number of valves for control, among which throttle valves are widely used to adjust flow resistance or to control the on-off of pipelines.

[0003] The on-off position of the flow channel in the valve body produces a throttling effect. The traditional valve produces condensed water at the throttling position due to a large change in the steam state, and releases a large amount of heat at the same time. The heat causes the metal at the sealing position to deform slightly due to heat, and also causes the seal to heat. When the deformation is serious, it affects the size matching. The closing force applied by the actuator on the misaligned parts further causes the force to shift, affecting the matching. At the least, the seal fails slightly, and at the worst, the valve core parts are directly damaged and leaks seriously. This situation needs to be paid special attention to during the high-temperature and high-pressure steam transportation process, because the effect of the throttling effect fluctuates slightly, which will cause a large amount of condensed water to be generated, and the large amount of heat released at the same time has a serious impact on the sealing surface. Summary of the invention

[0004] The object of the present invention is to provide a high temperature and high pressure resistant tightly sealed steam throttle valve to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high temperature and high pressure resistant tightly sealed steam throttle valve, the throttle valve comprises a valve body, an actuator, a valve cover, and an inlet section, one end of the valve body is connected to the inlet section, the valve cover is connected to the top of the valve body, the actuator is installed on the valve cover and penetrates into the valve body, the actuator opens or closes the flow channel in the valve body, and a boosting structure is provided in the inlet section.

[0007] The steam medium flows into the end of the inlet section, passes through the inlet section and then enters the valve body. The medium in the inlet section is pressurized first. If the state of the steam entering the throttle valve is close to the saturation point, liquefaction will occur in the inlet section, and condensed water will be precipitated in the inlet section. A large amount of heat will also be released at the inlet section. This is not the position of the valve on-off control. The slight deformation of the components caused by the heat does not affect the opening and closing performance of the valve. The medium after part of the condensed water is first precipitated at the inlet section enters the valve body. At this time, the throttling effect at the on-off throttling position is less affected, and only a small amount of condensed water is generated. The small amount of heat does not affect the sealing effect at the matching surface of the valve body and the actuator.

[0008] The inlet section comprises an expansion tube, which is thick in the middle and thin at both ends. One end of the expansion tube serves as the inlet of the throttle valve, and the other end of the expansion tube is connected to the valve body.

[0009] The flow cross-section of the medium flowing into the expansion tube is expanded, the flow velocity is reduced and the pressure is increased. All components that can be liquefied under higher pressure conditions are liquefied. When flowing out of the expansion tube, the cross-section is reduced, the flow velocity is increased and the pressure is reduced, which is far away from the conditions for the generation of condensed water, reducing the amount of condensed water generated by the throttling effect in the valve body and the amount of heat generated at the on-off position. The outer wall of the expansion tube can exchange the heat of the internal condensation process with the external air in time and discharge it out of the throttle valve; the flow medium is pressurized by expanding the flow channel, no power components are required, the structural complexity in the inlet section is reduced, and the influence of material deformation after a large amount of heat is generated here is reduced.

[0010] The inlet section also includes a liquid collecting seat, which is arranged at the bottom of the expansion cylinder. The throttle valve also includes an outflow section and a condensate pipe. The outflow section is connected to one end of the valve body away from the inlet section, and the other end of the outflow section extends downward. One end of the condensate pipe is connected to the bottom of the liquid collecting seat, and the other end of the condensate pipe is connected to the side wall of the outflow section. The position where the condensate pipe is connected to the outflow section is lower than the position where the condensate pipe is connected to the liquid collecting seat, and a hydrophobic and gas-blocking structure is arranged in the liquid collecting seat.

[0011] The condensate generated in the expansion cylinder flows into the liquid collecting seat. When the condensate is large, the hydrophobic and air-blocking structure in the liquid collecting seat opens, and the condensate is discharged together in the outflow section downstream of the throttle valve. The height difference at the connection position allows the water to flow naturally without the need for pressure difference drive, reducing the complexity of the setting of the hydrophobic and air-blocking structure.

[0012] The inlet section also includes a floating ball, and a flow hole is arranged at the bottom of the liquid collecting seat. The diameter of the floating ball is more than three times greater than the inner diameter of the flow hole.

[0013] When the amount of condensed water in the liquid collecting seat increases, the float floats up and separates from the outlet hole. The condensed water can enter the condensate pipe from the outlet hole and be discharged to the downstream of the throttle valve. When the amount of water in the liquid collecting seat is less, the float falls down and blocks the outlet hole. This structure is only applicable when the pressure difference between the upstream and downstream of the throttle valve is small. If the pressure difference is large, the float may be blocked on the outlet hole and cannot float up. In this case, the pressure status upstream and downstream of the throttle valve should be checked, and the inner diameter of the liquid collecting seat and the diameter of the float should be adjusted by replacing accessories so that the float can generate greater buoyancy to offset the pressure difference between the upper surface of the float and the surface at the bottom outlet hole.

[0014] The throttle valve also includes a heat pipe, one end of which is vertically inserted into the inlet section from top to bottom, and the upper end of the heat pipe is exposed outside.

[0015] The bottom of the heat pipe is located at a high-temperature position in the inlet section. After absorbing heat, the phase change medium in the heat pipe evaporates, and the vaporized medium in the heat pipe floats to the outside of the inlet section and contacts with the external air to discharge heat. After re-condensation, it returns to the bottom of the heat pipe, promptly taking away the heat of part of the condensed steam in the inlet section to avoid hindering the pressurization and condensation of the subsequent medium. Otherwise, after heat accumulates in the inlet section, steam in the same state continues to enter, and the amount of condensed water produced at the inlet section becomes less and less, and more is produced by throttling at the on-off position of the valve body, losing the original purpose of this application.

[0016] The heat pipe is located directly above the liquid collecting seat.

[0017] After condensate is generated in the middle section of the heat pipe, it can flow down the heat pipe quickly into the liquid collecting seat, avoiding the condensate staying in the expansion tube for a long time and being repeatedly heated. The re-vaporized condensate is mixed into the subsequent medium, making the medium tend to the dew point state, increasing the amount of condensate generated during the throttling effect in the valve body.

[0018] The top of the heat pipe is bifurcated.

[0019] The fork at the top of the heat pipe increases the heat exchange area on the upper part of the heat pipe and dissipates heat in time.

[0020] The actuator assembly includes a valve stem, a driver and a valve core. The valve stem is vertically slidably mounted on the valve cover. The driver is fixed on the top of the valve cover. The driver is connected to the valve stem and drives the valve stem to rise and fall vertically. The valve core is installed at the bottom of the valve stem. The valve core matches the throttling position size of the flow channel in the valve body. When the valve core rises and falls, it opens and blocks the flow channel in the valve body.

[0021] A ring seat is arranged on the inner wall of the valve cover, two shaft shoulders are arranged on the upper part of the valve stem, static pressure sealing rings are respectively inserted between the two shaft shoulders and the ring seat, and a sliding sealing ring is arranged at the sliding connection between the valve stem and the valve cover.

[0022] When the valve stem is at the upper and lower limit positions during the lifting process, one of the shaft shoulders presses the static pressure seal ring on the ring seat, and the static pressure seal ring is deformed by the direct pressure. The static pressure seal ring can provide a greater sealing effect with a larger deformation, while the sliding seal ring only plays a short-term sealing role during the lifting process. The compression amount of the sliding seal ring remains unchanged at all times, and the sealing performance remains unchanged. If the sliding seal ring uses a larger compression amount during production and assembly, the friction resistance of the valve stem during lifting will be very large, increasing the execution judgment error of the driver. It should be noted that if the throttle valve needs to act as a flow resistance adjustment, then it is best to replace one of the upper and lower limit positions of the valve stem corresponding to full open and full closed with the required flow resistance position, that is, cancel one of the fully closed or fully open states, and let the upstream and downstream valves take on the task of on-off control, so as to ensure the reliable sealing of the static pressure seal ring, and it is not good to use the intermediate state of the valve stem.

[0023] The inlet section, the outlet section and the valve body are separate components.

[0024] When the inlet section, the outlet section and the valve body are an integrated part, there is no need to set a seal at the connecting flange. However, the integrated inlet section, the outlet section and the valve body will greatly increase the difficulty of processing. The present application sets up several components independently and processes them separately, which are compatible with the shape of existing valve body components. The existing throttle valve only needs to modify the length of the interface pipe to adapt to the structure of the present application.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application adds an inlet expansion section before the throttling position of the throttle valve, so that the steam medium part that is closer to the state of the condensate generation point is liquefied first, and the condensate is generated in the inlet section, and a large amount of liquefaction heat is also generated in the inlet section. The medium subsequently flows into the throttling position, and only less condensate is generated. The greatly reduced heat generation is not easy to cause deformation of components at the sealing surface, and prevents leakage caused by loose sealing; while the valve stem dynamic seal continues to use the traditional piston rod type sealing ring, a static pressure sealing ring is added in the valve cover, so that when the throttle valve is opened and closed, the static pressure sealing ring that is directly deformed by pressure will take on further sealing tasks in a static state after the throttle valve opening and closing action is completed, thereby realizing a tight seal and preventing leakage of high-temperature and high-pressure steam during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the inlet section of the present invention;

[0028] Figure 3 yes Figure 2 A local enlarged view of point A in FIG.

[0029] Figure 4 It is a schematic diagram of the assembly of the valve body, the actuator and the valve cover of the present invention;

[0030] Figure 5 yes Figure 4 A local enlarged view of point B in FIG.

[0031] In the figure: 1. valve body; 2. actuator; 21. valve stem; 211. shaft shoulder; 22. driver; 3. valve cover; 31. ring seat; 4. inlet section; 41. expansion cylinder; 42. liquid collecting seat; 421. outflow hole; 43. float; 5. outflow section; 6. condensate pipe; 7. heat pipe; 81. static pressure sealing ring; 82. sliding sealing ring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] A high temperature and high pressure resistant tightly sealed steam throttle valve, the throttle valve comprises a valve body 1, an actuator 2, a valve cover 3, and an inlet section 4. One end of the valve body 1 is connected to the inlet section 4, the valve cover 3 is connected to the top of the valve body 1, the actuator 2 is installed on the valve cover 3 and penetrates into the valve body 1, the actuator 2 opens or closes the flow channel in the valve body 1, and the inlet section 4 has a pressurizing structure.

[0034] like Figure 1 As shown, the steam medium flows into the end of the inlet section 4, passes through the inlet section 4 and then enters the valve body 1. The medium in the inlet section 4 is pressurized first. If the state of the steam entering the throttle valve is close to the saturation point, then liquefaction will occur in the inlet section 4, condensed water will be precipitated in the inlet section 4, and a large amount of heat will be released in the inlet section 4. This is not the position of the valve on-off control. The slight deformation of the components caused by the heat does not affect the opening and closing performance of the valve. The medium after part of the condensed water is first precipitated at the inlet section 4 enters the valve body 1. At this time, the throttling effect at the on-off throttling position is less affected, and only a small amount of condensed water is generated. The small amount of heat does not affect the sealing effect at the matching surface of the valve body 1 and the actuator 2.

[0035] The inlet section 4 includes an expansion cylinder 41 , which is thick in the middle and thin at both ends. One end of the expansion cylinder 41 serves as the inlet of the throttle valve, and the other end of the expansion cylinder 41 is connected to the valve body 1 .

[0036] like Figure 1 As shown, the flow cross-section of the medium flowing into the expansion tube 41 is enlarged, the flow velocity is reduced and the pressure is increased, and all components that can be liquefied under higher pressure conditions are liquefied. When flowing out of the expansion tube 41, the cross-section is reduced, the flow velocity is increased and the pressure is reduced, which is far away from the conditions for the generation of condensed water, thereby reducing the amount of condensed water generated by the throttling effect in the valve body 1 and the amount of heat generated at the on and off positions. The outer wall of the expansion tube 41 can exchange the heat of the internal condensation process with the external air in time and discharge it out of the throttle valve; the flow medium is pressurized by expanding the flow channel, and no power components are required, which also reduces the structural complexity in the inlet section 4 and reduces the impact of material deformation after a large amount of heat is generated here.

[0037] The inlet section 4 also includes a liquid collecting seat 42, which is arranged at the bottom of the expansion tube 41. The throttle valve also includes an outflow section 5 and a condensate pipe 6. The outflow section 5 is connected to one end of the valve body 1 away from the inlet section 4, and the other end of the outflow section 5 extends downward. One end of the condensate pipe 6 is connected to the bottom of the liquid collecting seat 42, and the other end of the condensate pipe 6 is connected to the side wall of the outflow section 5. The position where the condensate pipe 6 is connected to the outflow section 5 is lower than the position where the condensate pipe 6 is connected to the liquid collecting seat 42. A hydrophobic and gas-blocking structure is arranged in the liquid collecting seat 42.

[0038] like Figure 1 , 2 As shown in FIG. 3 , the condensate generated in the expansion cylinder 41 flows into the liquid collecting seat 42. When the condensate is large, the hydrophobic and air-blocking structure in the liquid collecting seat 42 opens, and the condensate is discharged together with the outflow section 5 downstream of the throttle valve. The height difference at the connection position allows the water to flow naturally without the need for pressure difference drive, thereby reducing the complexity of the setting of the hydrophobic and air-blocking structure.

[0039] The inlet section 4 further includes a float 43 . A flow hole 421 is arranged at the bottom of the liquid collecting seat 42 . The diameter of the float 43 is more than three times the inner diameter of the flow hole 421 .

[0040] like Figure 3 As shown, when the amount of condensed water in the liquid collecting seat 42 increases, the float 43 floats up and separates from the outlet hole 421, and the condensed water can enter the condensate pipe 6 from the outlet hole 421 and be discharged to the downstream of the throttle valve. When the amount of water in the liquid collecting seat 42 is less, the float 43 falls down and blocks the outlet hole 421. This structure is only applicable to the case where the pressure difference between the upstream and downstream of the throttle valve is small. If the pressure difference is large, the float 43 may be blocked on the outlet hole 421 and cannot float up. In this case, the pressure state upstream and downstream of the throttle valve should be checked, and the inner diameter of the liquid collecting seat 42 and the diameter of the float 43 should be adjusted by replacing accessories so that the float 43 can generate greater buoyancy to offset the pressure difference between the upper surface of the float 43 and the surface at the bottom outlet hole 421.

[0041] The throttle valve further comprises a heat pipe 7, one end of which is vertically inserted into the inlet section 4 from top to bottom, and the upper end of the heat pipe 7 is exposed to the outside.

[0042] like Figure 2 As shown, the bottom of the heat pipe 7 is located at a high-temperature position in the inlet section 4. After absorbing heat, the phase change medium in the heat pipe 7 evaporates, and the vaporized medium in the heat pipe 7 floats to the outside of the inlet section 4 and contacts with the external air to discharge heat. After re-condensation, it returns to the bottom of the heat pipe 7, and promptly takes away the heat of part of the steam condensed in the inlet section 4 to avoid hindering the pressurization and condensation of the subsequent medium. Otherwise, after heat accumulates in the inlet section 4, steam in the same state continues to enter, and the amount of condensed water produced at the inlet section 4 becomes less and less, and more is produced by throttling at the on-off position in the valve body 1, which loses the original purpose of this application.

[0043] The heat pipe 7 is located directly above the liquid collecting seat 42 .

[0044] After condensed water is generated in the middle section of the heat pipe 7, it can flow down along the heat pipe 7 and quickly enter the liquid collecting seat 42, so as to avoid the condensed water staying in the expansion tube 41 for a long time and being repeatedly heated. The re-vaporized condensed water is mixed into the subsequent medium, making the medium tend to the dew point state, thereby increasing the amount of condensed water generated during the throttling action in the valve body 1.

[0045] The top end of the heat pipe 7 is bifurcated.

[0046] like Figure 2 As shown, the top portion of the heat pipe 7 is bifurcated to increase the heat exchange area of ​​the upper portion of the heat pipe 7 and dissipate heat in a timely manner.

[0047] The actuator 2 includes a valve stem 21, a driver 22 and a valve core. The valve stem 21 is vertically slidably mounted on the valve cover 3. The driver 22 is fixed on the top of the valve cover 3. The driver 22 is transmission-connected with the valve stem 21 and drives the valve stem to vertically rise and fall. A valve core is installed at the bottom of the valve stem 21. The valve core is matched with the throttling position size of the flow channel in the valve body 1. When the valve core rises and falls, it opens and blocks the flow channel in the valve body 1.

[0048] A ring seat 31 is arranged on the inner wall of the valve cover 3 , two shaft shoulders 211 are arranged on the upper part of the valve stem 21 , static pressure sealing rings 81 are respectively inserted between the two shaft shoulders 211 and the ring seat 31 , and a sliding sealing ring 82 is arranged at the sliding connection between the valve stem 21 and the valve cover 3 .

[0049] like Figure 4 , 5 As shown, when the valve stem 21 is at the upper and lower limit positions during the lifting process, one of the shaft shoulders 211 presses the static pressure seal ring 81 on the ring seat 31, and the static pressure seal ring 81 is deformed greatly by the direct pressure. The static pressure seal ring 81 can provide a greater sealing effect with a larger deformation, while the sliding seal ring 82 only plays a short-term sealing role during the lifting process. The compression amount of the sliding seal ring 82 remains unchanged at all times, and the sealing performance remains unchanged. If the sliding seal ring 82 uses a larger compression amount during production and assembly, the friction resistance of the valve stem 21 during lifting and lowering will be very large, increasing the execution judgment error of the driver 22. It should be noted that if the throttle valve needs to act as a flow resistance adjustment, then it is best to replace one of the upper and lower limit positions of the valve stem 21 corresponding to full opening and full closing with the required flow resistance position, that is, cancel one of the fully closed or fully open states, and let the upstream and downstream valves take on the task of on-off control, so as to ensure the reliable sealing of the static pressure seal ring 81, and it is not good to use the intermediate state of the valve stem 21.

[0050] The inlet section 4, the outlet section 5 and the valve body 1 are separate components.

[0051] When the inlet section 4, the outlet section 5 and the valve body 1 are an integrated part, there is no need to set a seal at the connecting flange. However, the integrated inlet section 4, the outlet section 5 and the valve body 1 will greatly increase the difficulty of processing. The present application sets up several components independently and processes them separately, which are compatible with the shape of the existing valve body 1 components. The existing throttle valve only needs to modify the length of the interface pipe to adapt to the structure of the present application.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high temperature and high pressure resistant tightly sealed steam throttle valve, characterized in that: The throttle valve comprises a valve body (1), an actuator (2), a valve cover (3), and an inlet section (4); one end of the valve body (1) is connected to the inlet section (4); the valve cover (3) is connected to the top of the valve body (1); the actuator (2) is mounted on the valve cover (3) and extends into the valve body (1); the actuator (2) opens or closes a flow channel in the valve body (1); The inlet section (4) comprises an expansion tube (41), the expansion tube (41) being thick in the middle and thin at both ends, one end of the expansion tube (41) serving as an inlet of the throttle valve, and the other end of the expansion tube (41) being connected to the valve body (1); The throttle valve further comprises an outflow section (5) and a condensate pipe (6), wherein the outflow section (5) is connected to one end of the valve body (1) away from the inlet section (4), the other end of the outflow section (5) extends downward, one end of the condensate pipe (6) is connected to the bottom of the liquid collecting seat (42), and the other end of the condensate pipe (6) is connected to the side wall of the outflow section (5); The throttle valve further comprises a heat pipe (7), one end of the heat pipe (7) being vertically inserted into the inlet section (4) from top to bottom, with the upper end of the heat pipe (7) exposed to the outside; The inlet section (4) further comprises a liquid collecting seat (42), wherein the liquid collecting seat (42) is arranged at the bottom of the expansion cylinder (41), and the position where the condensate water pipe (6) is connected to the outflow section (5) is lower than the position where the condensate water pipe (6) is connected to the liquid collecting seat (42); The heat pipe (7) is located directly above the liquid collecting seat (42).

2. A high temperature and high pressure resistant tightly sealed steam throttle valve according to claim 1, characterized in that: A hydrophobic and air-blocking structure is arranged inside the liquid collecting seat (42), the inlet section (4) further comprises a float (43), an outflow hole (421) is arranged at the bottom of the liquid collecting seat (42), and the diameter of the float (43) is more than three times greater than the inner diameter of the outflow hole (421).

3. The high temperature and high pressure resistant tightly sealed steam throttle valve according to claim 1, characterized in that: The top end of the heat pipe (7) is bifurcated.

4. The high temperature and high pressure resistant tightly sealed steam throttle valve according to claim 1, characterized in that: The actuator assembly (2) comprises a valve stem (21), a driver (22) and a valve core. The valve stem (21) is vertically slidably mounted on the valve cover (3). The driver (22) is fixed on the top of the valve cover (3). The driver (22) is transmission-connected to the valve stem (21) and drives the valve stem to vertically rise and fall. The valve core is mounted at the bottom of the valve stem (21). The valve core is matched in size with the throttling position of the flow passage in the valve body (1). When the valve core is raised or lowered, it opens and blocks the flow passage in the valve body (1). A ring seat (31) is provided on the inner wall of the valve cover (3), two shaft shoulders (211) are provided on the upper part of the valve stem (21), static pressure sealing rings (81) are respectively inserted between the two shaft shoulders (211) and the ring seat (31), and a sliding sealing ring (82) is provided at the sliding connection between the valve stem (21) and the valve cover (3).

5. The high temperature and high pressure resistant tightly sealed steam throttle valve according to claim 1, characterized in that: The inlet section (4), the outflow section (5) and the valve body (1) are separate components.

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