A high pressure differential steam vent valve

Abstract

The present invention discloses a high-pressure differential steam vent valve, which relates to the technical field of fluid control valves; it comprises: a valve body, which is provided with a steam inlet, a discharge outlet, a pilot leakage flow channel and a valve opening flow channel, the exhaust direction angle between the pilot leakage flow channel and the valve opening flow channel is an obtuse angle, and the inner cavity of the valve body is connected with the discharge outlet at the same time; a valve seat, which divides the inner cavity of the valve body into an air inlet cavity and a pilot cavity, and the air inlet cavity is connected with the steam inlet; an opening and closing valve core, which is arranged in the pilot cavity and can move axially relative to the pilot cavity, and a pilot installation cavity is arranged in the middle, and the pilot installation cavity can be connected with the air inlet cavity; a pilot valve core, which is arranged in the pilot installation cavity and can move axially relative to the pilot installation cavity, and is used to seal the communication channel between the pilot installation cavity and the air inlet cavity; a valve stem, one end of which is fixedly connected with the pilot valve core, the other end of which is located outside the valve body, and the stem is sealed and connected with the valve body; a muffler structure, which is installed in the discharge outlet. The present invention can extend the service life of the steam vent valve.

Description

Technical Field

[0001] The invention relates to the technical field of fluid control valves, and in particular to a high-pressure differential steam vent valve. Background Art

[0002] In large-scale coal chemical projects, coal chemical plants and boiler systems are equipped with multiple air separation units. Often, one power steam main pipe provides steam to several air separation units at the same time. Due to the increase in air separation series, it is easy to cause over-temperature and over-pressure in the steam network. In order to make the air separation unit run smoothly, safely and efficiently for a long time, a high-pressure differential steam vent valve (working pressure greater than 11Mpa, medium temperature less than 650 degrees Celsius) is installed on the steam main pipe. Among them, since the high-pressure differential steam vent valve is used in high-pressure differential venting applications, the prior art uses a multi-layer labyrinth sleeve outside the valve core to meet the requirements of high-pressure differential and low noise.

[0003] The inventors have discovered that, during the actual venting process, due to the requirements for the venting speed, the high-pressure steam is not reduced in pressure but directly introduced into the valve seat, causing the connecting pins between the multi-layer labyrinth sleeves to be subjected to greater pressure, which can easily lead to pin breakage or failure, ultimately causing the labyrinth sleeve to fall apart and fail to achieve the effect of noise reduction and silencing. Summary of the invention

[0004] In view of the technical problem that the labyrinth sleeve of the existing high-pressure differential steam vent valve is prone to failure, the present invention provides a high-pressure differential steam vent valve, which vents high-pressure steam simultaneously through a pilot leakage flow channel and a valve opening flow channel, and the angle between the flow directions of the high-pressure steam transported by the two flow channels is an obtuse angle, so that the transported high-pressure steam collides with each other to offset part of the pressure potential energy, and then is discharged through the silencer structure. This not only ensures that the vent valve has sufficient venting capacity while avoiding the failure of the silencer structure under the scouring of high-pressure steam, but also reduces the scouring of the valve seat sealing surface by high-pressure steam, thereby extending the service life of the high-pressure differential steam vent valve.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a high-pressure differential steam vent valve, comprising: a valve body, provided with a steam inlet, a discharge outlet, a pilot leakage flow channel and a valve opening flow channel, the exhaust direction angle between the pilot leakage flow channel and the valve opening flow channel is an obtuse angle, and the pilot leakage flow channel and the valve opening flow channel simultaneously connect the inner cavity of the valve body with the discharge outlet; a valve seat, arranged in the inner cavity of the valve body, and dividing the inner cavity of the valve body into an air inlet cavity and a pilot cavity, the air inlet cavity being connected to the steam inlet; an opening and closing valve core, arranged in the pilot cavity, and capable of axially moving relative to the pilot cavity, a pilot installation cavity being arranged in the middle, the pilot installation cavity being capable of communicating with the air inlet cavity; a pilot valve core, arranged in the pilot installation cavity, and capable of axially moving relative to the pilot installation cavity The cam is used to seal the communication passage between the pilot installation chamber and the air inlet chamber; a valve stem, one end of which is fixedly connected to the pilot valve core and the other end of which is located outside the valve body, the stem is sealed and connected to the valve body, and can move axially relative to the valve body; a silencer structure is installed in the discharge outlet; wherein, when the distance moved by the valve stem in the direction away from the valve seat is less than the valve opening idle stroke, the pilot valve core is opened and the pilot leakage flow channel remains closed; when the distance moved by the valve stem in the direction away from the valve seat is greater than the valve opening idle stroke, the valve stem drives the opening and closing valve core to move in the direction away from the valve seat, so that the pilot leakage flow channel is connected to the pilot chamber, and the valve opening flow channel is connected to the air inlet chamber.

[0007] The high-pressure differential steam vent valve provided by the present invention comprises a valve body, a valve seat, an opening and closing valve core, a pilot valve core, a valve stem and a muffler structure, wherein the valve body is provided with a steam inlet, a discharge outlet, a pilot discharge flow channel and a valve opening flow channel, and a pilot installation cavity is provided in the middle of the opening and closing valve core. When in use, the valve stem is driven to move toward the valve seat by a driving mechanism, so that the pilot valve core is pressed against the bottom of the pilot installation cavity to disconnect the connection between the pilot installation cavity and the air inlet cavity, and the opening and closing valve core is pressed against the sealing surface of the valve seat to cut off the connection between the air inlet cavity and the valve opening flow channel, and the steam inlet of the valve body is connected to the steam main pipe at the same time, and the high-pressure differential steam vent valve is always in a closed state when the steam circuit is operating normally.

[0008] When it is necessary to release high-pressure steam, the valve stem is driven by the driving mechanism to move away from the valve seat. When the movement distance of the valve stem is less than the valve opening empty stroke, the valve stem drives the pilot valve core to open while the opening and closing valve core maintains the initial position, so that the pilot leakage channel remains closed, and the high-pressure steam in the steam main pipe enters the pilot cavity through the pilot installation cavity, and then the high-pressure steam in the pilot cavity levels the pressure at both ends of the opening and closing valve core to reduce the resistance to the movement of the valve stem, making it easier for the driving mechanism to drive the valve stem to move quickly, thereby increasing the valve opening speed of the high-pressure differential steam vent valve.

[0009] Among them, as the valve stem continues to move, when the movement distance of the valve stem is greater than the valve opening idle stroke, the valve stem drives the opening and closing valve core to move away from the valve seat, so as to connect the pilot leakage flow channel with the pilot cavity and the valve opening flow channel with the air intake cavity, so that the high-pressure steam entering the air intake cavity through the steam inlet flows into the discharge outlet through the pilot leakage flow channel and the valve opening flow channel at the same time, which can ensure that the high-pressure difference steam vent valve has sufficient venting capacity. And because the exhaust direction angle between the pilot leakage flow channel and the valve opening flow channel is an obtuse angle, the high-pressure steam output from the two flow channels collides with each other to offset most of the pressure potential energy, and then is discharged through the silencer structure, so as to achieve the silencer effect while preventing the high-pressure steam from directly flushing the silencer structure, thereby preventing the silencer structure from failing under the flushing of the high-pressure steam.

[0010] In addition, high-pressure steam is discharged simultaneously through the pilot leakage flow channel and the valve opening flow channel, which can reduce the flow rate of high-pressure steam that flushes the valve seat sealing surface, thereby extending the service life of the high-pressure differential steam vent valve.

[0011] In summary, the high-pressure differential steam vent valve provided by the present invention can not only ensure that the vent valve has sufficient venting capacity while avoiding the failure of the silencer structure under the scouring of high-pressure steam, but also reduce the scouring of the valve seat sealing surface by high-pressure steam, thereby extending the service life of the high-pressure differential steam vent valve.

[0012] In an optional embodiment of the present application, a pilot seat hole adapted to the pilot valve core is provided at the bottom of the pilot installation cavity, so as to cut off the connection between the pilot installation cavity and the air inlet cavity through the cooperation between the pilot valve core and the end of the pilot seat hole, thereby ensuring that the pilot installation cavity can be connected with the air inlet cavity.

[0013] In an optional embodiment of the present application, the end of the pilot valve core facing the pilot seat hole is shaped to gradually narrow along the axial direction of the pilot valve core, so that the end face of the pilot valve core has sufficient high-pressure steam flushing area, and has the effect of guiding the high-pressure steam, thereby reducing the flushing of the pilot valve core by the high-pressure steam, so as to ensure that the pilot valve core can reliably seal the pilot seat hole.

[0014] In an optional embodiment of the present application, the pilot installation cavity is a cylindrical cavity with a narrowed upper end, and a pilot connecting hole is arranged on the axial side of the pilot installation cavity; two guide sealing rings are arranged axially at intervals on the side wall of the pilot valve core, and the two guide sealing rings are arranged in the pilot connecting hole along the axial direction of the pilot installation cavity; a limiting boss is arranged at one end of the valve stem facing the pilot valve core, and the limiting boss is movably inserted in the pilot installation cavity so as to pass through the limiting boss and the narrowed end of the pilot installation cavity. The cooperation drives the opening and closing valve core to move; a pilot spring is arranged in the pilot installation cavity, and the action force of the pilot spring is between the limiting boss and the bottom of the pilot installation cavity; wherein, when the valve stem moves to a limited position, the pilot leakage channel is connected with the pilot cavity through the pilot connecting hole to ensure that only the pilot cavity is connected with the air inlet cavity at the initial stage of the valve stem movement, and after the valve stem continues to move, it can drive the opening and closing valve core to move and connect the pilot leakage channel with the pilot cavity, and connect the air inlet cavity with the valve opening channel.

[0015] In an optional embodiment of the present application, the limiting boss is provided with a steam guide channel, which is used to connect the spaces opposite to the limiting boss on both axial sides to ensure that when the pilot valve core is opened, high-pressure steam can smoothly enter the pilot chamber.

[0016] In an optional embodiment of the present application, the muffler structure includes a buffer cylinder, the buffer cylinder is fixed in the discharge outlet, and the buffer cylinder is arranged axially along the discharge outlet; the buffer cylinder is closed at one end facing the discharge outlet, and the other end is sealed and fixedly connected to the side wall of the discharge outlet, the side wall of the buffer cylinder is provided with a plurality of side exhaust holes, and the closed end of the buffer cylinder is provided with an axial exhaust hole. The high-pressure steam output from the two flow channels is buffered by the inner cavity of the buffer cylinder after the collision and most of the pressure potential energy is offset, the scouring effect of the steam is reduced, and the steam is guided to be discharged from the side exhaust holes and the axial exhaust holes respectively, so that the buffered steam is discharged from two directions, which can reduce the flow rate of the steam when it is discharged and further reduce the venting noise.

[0017] In an optional embodiment of the present application, the silencer structure further includes a spoiler cylinder, which is closed at one end facing the discharge outlet; the spoiler cylinder is sleeved outside the buffer cylinder at intervals, the spoiler cylinder is coaxially arranged with the buffer cylinder, and the side wall of the spoiler cylinder is spaced apart from the side wall of the discharge outlet; a plurality of steam outlets are arranged at the closed end of the spoiler cylinder, the plurality of steam outlets are staggered with the corresponding axial exhaust holes, and the sum of the effective flow areas of the plurality of steam outlets is smaller than the effective flow area of ​​the gap flow channel between the spoiler cylinder and the buffer cylinder.

[0018] Since the spoiler is sleeved outside the buffer tube, and the steam outlet is staggered with the corresponding axial exhaust hole, the spoiler and the buffer tube can form a labyrinth silencer, which can ensure that the silencer structure has sufficient silencer effect. The sum of the effective flow areas of the multiple steam outlets is smaller than the effective flow area of ​​the gap flow channel between the spoiler and the buffer tube, so that the steam discharged from the axial exhaust hole can flow in the opposite direction from the gap flow channel between the spoiler and the buffer tube under the flow resistance of the spoiler, which can achieve the effect of diversion on the one hand, and on the other hand, can dissipate energy through the collision of the steam flowing in the opposite direction with the steam flowing in the lateral direction, thereby ensuring that the silencer structure The silencer effect meets the design and use requirements.

[0019] In an optional embodiment of the present application, it also includes a balanced flow control component; the balanced flow control component includes a flow control valve plate, which is movably inserted in the valve body; the balanced flow control component also includes a temperature-sensitive driving cylinder, which can drive the flow control valve plate to radially insert into the pilot leakage flow channel and the valve opening flow channel according to the difference in steam flow in the pilot leakage flow channel and the valve opening flow channel, so as to reduce the steam flow in the corresponding flow channel, so that the difference in steam flow in the pilot leakage flow channel and the valve opening flow channel is maintained within a set range, ensuring that the high-pressure steam output from the two flow channels can effectively offset the energy consumption, so as to fully play the role of reducing pressure and dissipating energy, and avoid high-pressure steam directly flushing the silencer structure.

[0020] In an optional embodiment of the present application, the flow control valve plate includes a flow control rod section, and flow control plates are arranged at both ends of the flow control rod section; the temperature sensing drive cylinder includes a drive cylinder body closed at both ends, a drive piston is adapted to be arranged in the drive cylinder body, the flow control rod section is inserted in the drive cylinder body, the flow control rod section is fixedly connected to the drive piston, and the axial direction of the drive cylinder body is perpendicular to the flow direction of the pilot leakage flow channel and the flow direction of the valve opening flow channel; the temperature sensing drive cylinder also includes a first temperature sensing bag and a second temperature sensing bag, the first temperature sensing bag and the second temperature sensing bag are both elastic energy storage temperature sensing bags, and the first temperature sensing bag The specifications of the first temperature-sensing package and the second temperature-sensing package are the same, the first temperature-sensing package is arranged in the pilot leakage flow channel, the side wall of the first temperature-sensing package is spaced apart from the side wall of the pilot leakage flow channel, and the second temperature-sensing package is arranged in the valve opening flow channel, the side wall of the second temperature-sensing package is spaced apart from the side wall of the valve opening flow channel; wherein, the first temperature-sensing package and the second temperature-sensing package can both contain temperature-sensitive working fluid, and the working fluid storage cavity of the first temperature-sensing package is connected to the inner cavity of one end of the driving cylinder body facing the valve opening flow channel, and the working fluid storage cavity of the second temperature-sensing package is connected to the inner cavity of one end of the driving cylinder body facing the pilot leakage flow channel. To ensure that the difference in steam flow in the pilot leakage flow channel and the valve opening flow channel is maintained within the set range.

[0021] In an optional embodiment of the present application, the first temperature sensing package includes a temperature sensing shell, which is made of a heat-conducting material; a temperature sensing piston is adapted to be arranged in the temperature sensing shell, and the temperature sensing piston divides the inner cavity of the temperature sensing shell into a working fluid cavity and an elastic energy storage cavity; an energy storage spring is arranged in the elastic energy storage cavity, and the action force of the energy storage spring is between the side wall of the temperature sensing piston and the inner side wall of the end of the temperature sensing shell, so as to ensure that the temperature sensing working fluid in the first temperature sensing package can expand after being heated, and can provide an expansion and return cavity for the expanded temperature sensing working fluid.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The high-pressure differential steam vent valve provided by the present invention comprises a valve body, a valve seat, an opening and closing valve core, a pilot valve core, a valve stem and a silencer structure. The valve body is provided with a steam inlet, a discharge outlet, a pilot leakage flow channel and a valve opening flow channel. A pilot installation cavity is provided in the middle of the opening and closing valve core. When it is necessary to discharge the high-pressure steam, the valve stem is driven by a driving mechanism to move in a direction away from the valve seat. When the movement distance of the valve stem is less than the valve opening empty stroke, the valve stem drives the pilot valve core to open while the opening and closing valve core maintains the initial position, so that the pilot leakage flow channel remains in a closed state, and the high-pressure steam in the steam main pipe enters the pilot cavity through the pilot installation cavity, and then the pressure at both ends of the opening and closing valve core is leveled by the high-pressure steam in the pilot cavity, so as to reduce the resistance to the movement of the valve stem, facilitate the driving mechanism to drive the valve stem to move quickly, and then improve the valve opening speed of the high-pressure differential steam vent valve.

[0024] 2. In the high-pressure differential steam vent valve provided by the present invention, the pilot leakage flow channel and the valve opening flow channel simultaneously connect the inner cavity of the valve body with the discharge outlet, the valve seat divides the inner cavity of the valve body into an air inlet cavity and a pilot cavity, and the pilot valve core is arranged in the pilot installation cavity. As the valve stem moves, when the moving distance of the valve stem is greater than the valve opening empty stroke, the valve stem drives the opening and closing valve core to move away from the valve seat, and can simultaneously connect the pilot leakage flow channel with the pilot cavity, and the valve opening flow channel with the air inlet cavity, so that the high-pressure steam entering the air inlet cavity through the steam inlet simultaneously flows into the discharge outlet through the pilot leakage flow channel and the valve opening flow channel, which can ensure that the high-pressure differential steam vent valve has sufficient venting capacity.

[0025] 3. In the high-pressure differential steam vent valve provided by the present invention, the exhaust direction angle between the pilot discharge flow channel and the valve opening flow channel is an obtuse angle, so that the high-pressure steam output from the two flow channels collides with each other to offset most of the pressure potential energy, and then is discharged through the silencer structure, so as to achieve the silencer effect while preventing the high-pressure steam from directly flushing the silencer structure, thereby preventing the silencer structure from failing under the flushing of the high-pressure steam.

[0026] 4. The high-pressure differential steam vent valve provided by the present invention discharges high-pressure steam simultaneously through the pilot leakage flow channel and the valve opening flow channel, which can reduce the flow rate of high-pressure steam that flushes the valve seat sealing surface, thereby extending the service life of the high-pressure differential steam vent valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments 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.

[0028] In the attached picture:

[0029] Figure 1 This is a schematic structural diagram of a high-pressure differential steam vent valve according to an embodiment of the present invention;

[0030] Figure 2 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged structure of part A;

[0031] Figure 3 It is a schematic diagram of the structure after the on-off valve core and the pilot valve core are assembled according to an embodiment of the present invention;

[0032] Figure 4 For the embodiment of the present invention Figure 1 A schematic diagram of the enlarged structure of part B;

[0033] Figure 5 For the embodiment of the present invention Figure 1 Schematic diagram of the enlarged structure of the C part

[0034] Figure 6 Schematic diagram of the structure of the first temperature sensing package in an embodiment of the present invention.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1-valve body, 2-steam inlet, 3-discharge outlet, 4-pilot leakage channel, 5-valve opening channel, 6-valve seat, 7-inlet chamber, 8-pilot chamber, 9-opening and closing valve core, 10-pilot installation chamber, 11-pilot valve core, 12-valve stem, 13-pilot seat hole, 14-pilot connecting hole, 15-guide sealing ring, 16-limiting boss, 17-pilot spring, 18-steam guide channel, 19-buffer cylinder, 20-side exhaust hole, 21-axial exhaust hole, 22-turbulator, 23-steam outlet, 24-flow control rod section, 25-flow control plate, 26-driving cylinder, 27-driving piston, 28-first temperature sensing package, 28a-temperature sensing shell, 28b-temperature sensing piston, 28c-working fluid chamber, 28d-elastic energy storage chamber, 28e-energy storage spring, 29-second temperature sensing package. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. 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.

[0038] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or is the orientation or positional relationship in which the device of the application is usually placed when in use, or is the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. At the same time, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Example

[0040] Combination Figure 1-Figure 5, the present embodiment provides a high-pressure differential steam vent valve, comprising: a valve body 1, provided with a steam inlet 2, a discharge outlet 3, a pilot leakage flow channel 4 and a valve opening flow channel 5, the exhaust direction angle between the pilot leakage flow channel 4 and the valve opening flow channel 5 is an obtuse angle, and the pilot leakage flow channel 4 and the valve opening flow channel 5 simultaneously connect the inner cavity of the valve body 1 with the discharge outlet 3; a valve seat 6, arranged in the inner cavity of the valve body 1, and divides the inner cavity of the valve body 1 into an air inlet cavity 7 and a pilot cavity 8, and the air inlet cavity 7 is connected to the steam inlet 2; an opening and closing valve core 9, arranged in the pilot cavity 8, and capable of axially moving relative to the pilot cavity 8, and a pilot installation cavity 10 is arranged in the middle, and the pilot installation cavity 10 can be connected to the air inlet cavity 7; a pilot valve core 11, arranged in the pilot installation cavity 10, and capable of axially moving relative to the pilot installation cavity 10 Axial movement, used to seal the communication channel between the pilot installation chamber 10 and the air inlet chamber 7; a valve stem 12, one end of which is fixedly connected to the pilot valve core 11, and the other end is located outside the valve body 1, the stem is sealed and connected to the valve body 1, and can move axially relative to the valve body 1; a silencer structure, installed in the discharge outlet 3; wherein, when the distance moved by the valve stem 12 in the direction away from the valve seat 6 is less than the valve opening idle stroke, the pilot valve core 11 is opened and the pilot leakage channel 4 remains closed, and when the distance moved by the valve stem 12 in the direction away from the valve seat 6 is greater than the valve opening idle stroke, the valve stem 12 drives the opening and closing valve core 9 to move in the direction away from the valve seat 6, so that the pilot leakage channel 4 is connected with the pilot chamber 8, and the valve opening channel 5 is connected with the air inlet chamber 7.

[0041] Combination Figure 3 Specifically, a pilot seat hole 13 adapted to the pilot valve core 11 is provided at the bottom of the pilot installation cavity 10, so that the connection between the pilot installation cavity 10 and the air inlet cavity 7 is cut off through the cooperation between the pilot valve core 11 and the end of the pilot seat hole 13, thereby ensuring that the pilot installation cavity 10 can be connected with the air inlet cavity 7.

[0042] In this embodiment, the end of the pilot valve core 11 facing the pilot seat hole 13 is shaped to gradually shrink along the axial direction of the pilot valve core 11, so that the end face of the pilot valve core 11 has sufficient high-pressure steam flushing area, and has the effect of guiding the high-pressure steam, thereby reducing the flushing of the high-pressure steam on the pilot valve core 11, so as to ensure that the pilot valve core 11 can reliably seal the pilot seat hole 13.

[0043] Continue to combine Figure 3The pilot installation cavity 10 is a cylindrical cavity with a narrowed upper end, and a pilot connecting hole 14 is arranged on the axial side of the pilot installation cavity 10; two guide sealing rings 15 are arranged axially at intervals on the side wall of the pilot valve core 11, and the two guide sealing rings 15 are arranged in the pilot connecting hole 14 along the axial direction of the pilot installation cavity 10; a limiting boss 16 is arranged at one end of the valve stem 12 facing the pilot valve core 11, and the limiting boss 16 is movably inserted in the pilot valve core 11. The pilot installation cavity 10 is provided with a pilot spring 17, and the action force of the pilot spring 17 is between the limiting boss 16 and the bottom of the pilot installation cavity 10. When the pilot valve core 11 reliably seals the pilot seat hole 13, the distance between the limiting boss 16 and the top of the pilot installation cavity 10 is the valve opening idle stroke.

[0044] Among them, when the valve stem 12 moves to a limited position, the pilot leakage channel 4 is connected with the pilot chamber 8 through the pilot connecting hole 14 to ensure that only the pilot chamber 8 is connected with the air intake chamber 7 at the initial stage of the movement of the valve stem 12, and after the valve stem 12 continues to move, it can drive the opening and closing valve core 9 to move and connect the pilot leakage channel 4 with the pilot chamber 8, and the air intake chamber 7 with the valve opening channel 5.

[0045] It should be noted that, when the air inlet chamber 7 is connected to the valve opening flow channel 5, the pilot leakage flow channel 4 and the inlet of the valve opening flow channel 5 are separated by a guide sealing ring 15; since the sealing requirements between the pilot leakage flow channel 4 and the inlet of the valve opening flow channel 5 are relatively low, a conventional flexible regular sealing ring can be used as the guide sealing ring 15.

[0046] It is understandable that the limiting boss 16 is provided with a steam guide channel 18, and the steam guide channel 18 is used to connect the spaces opposite to the limiting boss 16 on both axial sides to ensure that when the pilot valve core 11 is opened, high-pressure steam can smoothly enter the pilot chamber 8.

[0047] Combination Figure 4The muffler structure includes a buffer cylinder 19, which is fixed in the discharge outlet 3 and arranged axially along the discharge outlet 3; the buffer cylinder 19 is closed at one end facing the discharge outlet 3, and the other end is sealed and fixedly connected to the side wall of the discharge outlet 3, and the side wall of the buffer cylinder 19 is provided with a plurality of side exhaust holes 20, and the closed end of the buffer cylinder 19 is provided with an axial exhaust hole 21. The high-pressure steam output from the two flow channels is buffered by the inner cavity of the buffer cylinder 19 after the collision and offset of most of the pressure potential energy, thereby reducing the scouring effect of the steam, and guiding the steam to be discharged from the side exhaust hole 20 and the axial exhaust hole 21 respectively, so that the buffered steam is discharged from two directions, which can reduce the flow rate of the steam when it is discharged, and further reduce the venting noise.

[0048] In the present embodiment, the silencer structure further includes a spoiler tube 22, which is closed at one end facing the discharge outlet 3; the spoiler tube 22 is sleeved outside the buffer tube 19 at intervals, the spoiler tube 22 is coaxially arranged with the buffer tube 19, and the side wall of the spoiler tube 22 is spaced apart from the side wall of the discharge outlet 3; a plurality of steam outlets 23 are arranged at the closed end of the spoiler tube 22, and the plurality of steam outlets 23 are staggered with the corresponding axial exhaust holes 21, and the sum of the effective flow areas of the plurality of steam outlets 23 is less than the effective flow area of ​​the gap flow channel between the spoiler tube 22 and the buffer tube 19.

[0049] Since the spoiler 22 is sleeved outside the buffer tube 19, and the steam outlet 23 is staggered with the corresponding axial exhaust hole 21, the spoiler 22 and the buffer tube 19 can form a labyrinth silencing result, which can ensure that the silencing structure has sufficient silencing effect. The sum of the effective flow areas of the multiple steam outlets 23 is smaller than the effective flow area of ​​the gap flow channel between the spoiler 22 and the buffer tube 19, so that the steam discharged from the axial exhaust hole 21 can flow in the opposite direction from the gap flow channel between the spoiler 22 and the buffer tube 19 under the flow resistance of the spoiler 22, which can achieve the effect of diversion on the one hand, and on the other hand, the energy can be dissipated by the collision of the steam flowing in the opposite direction with the steam flowing in the lateral direction, thereby ensuring that the silencing effect of the silencing structure meets the design and use requirements.

[0050] On this basis, the present embodiment also includes a balanced flow control component; the balanced flow control component includes a flow control valve plate, which is movably inserted in the valve body 1; the balanced flow control component also includes a temperature-sensitive driving cylinder, which can drive the flow control valve plate to radially insert into the pilot leakage flow channel 4 and the valve opening flow channel 5 according to the difference in steam flow in the pilot leakage flow channel 4 and the valve opening flow channel 5, so as to reduce the steam flow of the corresponding flow channel, so that the difference in steam flow in the pilot leakage flow channel 4 and the valve opening flow channel 5 is maintained within a set range, ensuring that the high-pressure steam output from the two flow channels can effectively offset the energy consumption, so as to fully play the role of reducing pressure and dissipating energy, and avoid high-pressure steam directly flushing the silencer structure.

[0051] Combination Figure 5 , the flow control valve plate includes a flow control rod section 24, and flow control plates 25 are arranged at both ends of the flow control rod section 24; the temperature sensing drive cylinder includes a drive cylinder body 26 with closed ends, and a drive piston 27 is adapted in the drive cylinder body 26, and the flow control rod section 24 is inserted in the drive cylinder body 26, and the flow control rod section 24 is fixedly connected to the drive piston 27, and the axial direction of the drive cylinder body 26 is perpendicular to the flow direction of the pilot leakage flow channel 4 and the flow direction of the valve opening flow channel 5; the temperature sensing drive cylinder also includes a first temperature sensing bag 28 and a second temperature sensing bag 29, and the first temperature sensing bag 28 and the second temperature sensing bag 29 are both elastic energy storage temperature sensing bags, and the first temperature sensing bag 28 and the The second temperature-sensing bag 29 has the same specifications, the first temperature-sensing bag 28 is arranged in the pilot leakage channel 4, and the side wall of the first temperature-sensing bag 28 is spaced apart from the side wall of the pilot leakage channel 4, and the second temperature-sensing bag 29 is arranged in the valve opening channel 5, and the side wall of the second temperature-sensing bag 29 is spaced apart from the side wall of the valve opening channel 5; wherein, both the first temperature-sensing bag 28 and the second temperature-sensing bag 29 can contain temperature-sensitive working fluid, and the working fluid storage cavity of the first temperature-sensing bag 28 is connected to the inner cavity of one end of the driving cylinder 26 facing the valve opening channel 5, and the working fluid storage cavity of the second temperature-sensing bag 29 is connected to the inner cavity of one end of the driving cylinder 26 facing the pilot leakage channel 4.

[0052] It can be understood that since the first temperature-sensing package 28 and the second temperature-sensing package 29 are both elastic energy storage temperature-sensing packages, the temperature-sensitive medium therein can expand after being heated, and can provide an expansion and return cavity for the expanded temperature-sensitive medium; and the first temperature-sensing package 28 and the second temperature-sensing package 29 have the same specifications, and in the steam main pipe, both are single high-temperature and high-pressure steam (pressure greater than 11Mpa, temperature less than 650°C), therefore, in the process of steam venting, the pressure and collision volume of the temperature-sensitive medium in the first temperature-sensing package 28 are controlled by the flow through the pilot discharge channel 4. The steam flow rate in the first temperature sensing bag 28 is determined, and the pressure of the temperature-sensitive working fluid in the first temperature sensing bag 28 is positively correlated with the steam flow rate flowing through the pilot leakage channel 4. The pressure and collision volume of the temperature-sensitive working fluid in the second temperature sensing bag 29 are determined by the steam flow rate flowing through the valve opening channel 5, and the pressure of the temperature-sensitive working fluid in the second temperature sensing bag 29 is positively correlated with the steam flow rate flowing through the pilot leakage channel 4. Therefore, the pressures in the first temperature sensing bag 28 and the second temperature sensing bag 29 can reflect the size of the steam flow rates in the corresponding pilot leakage channel 4 and the valve opening channel 5.

[0053] At the same time, the working fluid storage chamber of the first temperature sensing bag 28 is connected to the inner chamber of one end of the driving cylinder 26 facing the valve opening flow channel 5, and the working fluid storage chamber of the second temperature sensing bag 29 is connected to the inner chamber of one end of the driving cylinder 26 facing the pilot leakage flow channel 4. If the steam flow in the pilot leakage flow channel 4 is large, the working fluid pressure in the first temperature sensing bag 28 is higher, thereby pushing the driving piston 27 to move in the direction of the pilot leakage flow channel 4, and then driving the flow control plate 25 to radially insert into the pilot leakage flow channel 4 to reduce the steam flow through the pilot leakage flow channel 4, so that the difference in steam flow in the pilot leakage flow channel 4 and the valve opening flow channel 5 is maintained within a set range, and the internal working fluid of the second temperature sensing bag 29 compresses the elastic mechanism in the second temperature sensing bag 29 to accommodate the temperature-sensitive working fluid pressed in by the driving piston 27. On the contrary, if the steam flow in the valve opening flow channel 5 is large, the working fluid pressure in the second temperature sensing bag 29 is higher, thereby pushing the driving piston 27 to move in the direction of the valve opening flow channel 5 to reduce the steam flow passing through the valve opening flow channel 5 to ensure that the difference in steam flow in the pilot leakage flow channel 4 and the valve opening flow channel 5 is maintained within the set range.

[0054] Combination Figure 6The first temperature-sensing package 28 includes a temperature-sensing shell 28a, which is made of heat-conducting material; a temperature-sensing piston 28b is adapted in the temperature-sensing shell 28a, and the temperature-sensing piston 28b divides the inner cavity of the temperature-sensing shell 28a into a working medium cavity 28c and an elastic energy storage cavity 28d. An energy storage spring 28e is arranged in the elastic energy storage cavity 28d, and the acting force of the energy storage spring 28e is between the side wall of the temperature-sensing piston 28b and the inner side wall of the end of the temperature-sensing shell 28a, so as to ensure that the temperature-sensing working medium in the first temperature-sensing package 28 can expand after being heated, and can provide an expansion and return cavity for the expanded temperature-sensing working medium. That is to say, if the difference in steam flow in the pilot leakage channel 4 and the valve opening channel 5 is within the set range, the medium pressure difference on both sides of the driving piston 27 is small, the driving piston 27 remains stationary, and the temperature-sensitive working medium in the first temperature-sensitive bag 28 expands and increases in volume, directly compressing the energy storage spring 28e in the elastic energy storage chamber 28d therein to accommodate the expanded temperature-sensitive working medium.

[0055] It should be understood that in this embodiment, the valve core and the valve seat 6 are commonly used end face sealing mechanisms, the seal between the valve stem 12 and the valve body 1 is a combination of packing seal and metal seal, and the joints of the other cavities all use the sealing structure used by the high-temperature valve body 1. The above seals are commonly used in the prior art, such as the corresponding sealing structures recorded in the utility model patent with publication number CN206036256U and the invention patent with publication number CN110345264B, etc., which will not be described in detail in this application. At the same time, the structure of the second temperature-sensing package 29 is the same as that of the first temperature-sensing package 28, and will not be shown in this embodiment.

[0056] In summary, the high-pressure differential steam vent valve provided in this embodiment includes a valve body 1, a valve seat 6, an opening and closing valve core 9, a pilot valve core 11, a valve stem 12, a silencer structure and a balanced flow control component. The valve body 1 is provided with a steam inlet 2, a discharge outlet 3, a pilot leakage channel 4 and a valve opening channel 5. A pilot installation cavity 10 is provided in the middle of the opening and closing valve core 9. The balanced flow control component includes a flow control valve plate and a temperature sensing drive cylinder.

[0057] When in use, the valve stem 12 is driven by the driving mechanism to move toward the valve seat 6, so that the pilot valve core 11 is pressed against the bottom of the pilot installation chamber 10 to disconnect the connection between the pilot installation chamber 10 and the air inlet chamber 7, and the opening and closing valve core 9 is pressed against the sealing surface of the valve seat 6 to cut off the connection between the air inlet chamber 7 and the valve opening flow channel 5, and at the same time, the steam inlet 2 of the valve body 1 is connected to the steam main pipe. When the steam circuit is operating normally, the high-pressure differential steam vent valve is always in a closed state.

[0058] When it is necessary to release high-pressure steam, the valve stem 12 is driven by the driving mechanism to move away from the valve seat 6. When the moving distance of the valve stem 12 is less than the valve opening empty stroke, the valve stem 12 drives the pilot valve core 11 to open while the opening and closing valve core 9 maintains the initial position, so that the pilot leakage channel 4 remains in a closed state, and the high-pressure steam in the steam main pipe enters the pilot chamber 8 through the pilot installation chamber 10, and then the high-pressure steam in the pilot chamber 8 levels the pressure at both ends of the opening and closing valve core 9, so as to reduce the resistance to the movement of the valve stem 12, facilitate the driving mechanism to drive the valve stem 12 to move quickly, and then increase the valve opening speed of the high-pressure difference steam vent valve.

[0059] Among them, as the valve stem 12 continues to move, when the moving distance of the valve stem 12 is greater than the valve opening empty stroke, the valve stem 12 drives the opening and closing valve core 9 to move in the direction away from the valve seat 6, so as to simultaneously connect the pilot leakage flow channel 4 with the pilot chamber 8 and the valve opening flow channel 5 with the air intake chamber 7, so that the high-pressure steam entering the air intake chamber 7 through the steam inlet 2 simultaneously flows into the discharge outlet 3 through the pilot leakage flow channel 4 and the valve opening flow channel 5, which can ensure that the high-pressure difference steam vent valve has sufficient venting capacity. And because the exhaust direction angle between the pilot leakage flow channel 4 and the valve opening flow channel 5 is an obtuse angle, the high-pressure steam output from the two flow channels collides with each other to offset most of the pressure potential energy, and then is discharged through the silencer structure, so as to achieve the silencer effect while preventing the high-pressure steam from directly flushing the silencer structure, thereby preventing the silencer structure from failing under the flushing of the high-pressure steam.

[0060] At the same time, if the steam flow in the pilot leakage flow channel 4 is large, the working fluid pressure in the first temperature sensing bag is higher, thereby pushing the driving piston 27 to move in the direction of the pilot leakage flow channel 4, and then driving the flow control plate 25 to radially insert into the pilot leakage flow channel 4 to reduce the steam flow through the pilot leakage flow channel 4; if the steam flow in the valve opening flow channel 5 is large, the working fluid pressure in the second temperature sensing bag is higher, thereby pushing the driving piston 27 to move in the direction of the valve opening flow channel 5 to reduce the steam flow through the valve opening flow channel 5, so as to ensure that the difference in steam flow in the pilot leakage flow channel 4 and the valve opening flow channel 5 is maintained within the set range, so that the steam output from the pilot leakage flow channel 4 and the valve opening flow channel 5 can effectively offset the energy consumption.

[0061] In addition, high-pressure steam is discharged simultaneously through the pilot leakage flow channel 4 and the valve opening flow channel 5, which can reduce the flow rate of high-pressure steam that flushes the sealing surface of the valve seat 6, thereby extending the service life of the high-pressure differential steam vent valve.

[0062] In summary, the high-pressure differential steam vent valve provided in this embodiment can not only ensure that the vent valve has sufficient venting capacity while avoiding the failure of the silencer structure under the scouring of high-pressure steam, but also reduce the scouring of the sealing surface of the valve seat 6 by high-pressure steam, thereby extending the service life of the high-pressure differential steam vent valve, and can also ensure that the silencer effect of the silencer structure meets the design and use requirements.

[0063] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high pressure differential steam vent valve, characterized in that: include: A valve body (1) is provided with a steam inlet (2), a discharge outlet (3), a pilot leakage flow channel (4) and a valve opening flow channel (5), wherein the exhaust direction angle between the pilot leakage flow channel (4) and the valve opening flow channel (5) is an obtuse angle, and the pilot leakage flow channel (4) and the valve opening flow channel (5) simultaneously connect the inner cavity of the valve body (1) with the discharge outlet (3); A valve seat (6) is arranged in the inner cavity of the valve body (1) and divides the inner cavity of the valve body (1) into an air intake cavity (7) and a pilot cavity (8), wherein the air intake cavity (7) is connected to the steam inlet (2); An on-off valve core (9) is arranged in the pilot chamber (8) and is capable of axial movement relative to the pilot chamber (8), a pilot installation chamber (10) is arranged in the middle, and the pilot installation chamber (10) is capable of communicating with the air inlet chamber (7); A pilot valve core (11), arranged in the pilot installation cavity (10) and capable of axial movement relative to the pilot installation cavity (10), and used for sealing a communication passage between the pilot installation cavity (10) and the air inlet cavity (7); A valve stem (12), one end of which is fixedly connected to the pilot valve core (11), the other end of which is located outside the valve body (1), the stem portion being sealedly connected to the valve body (1) and capable of moving along its own axial direction relative to the valve body (1); A silencer structure installed in the discharge outlet (3); Wherein, when the distance moved by the valve stem (12) in the direction away from the valve seat (6) is less than the valve opening idle stroke, the pilot valve core (11) is opened and the pilot leakage channel (4) remains closed; when the distance moved by the valve stem (12) in the direction away from the valve seat (6) is greater than the valve opening idle stroke, the on-off valve core (9) is driven to move in the direction away from the valve seat (6), so that the pilot leakage channel (4) is communicated with the pilot chamber (8), and the valve opening channel (5) is communicated with the air inlet chamber (7); It also includes a balanced flow control component, the balanced flow control component includes a flow control valve plate, and the flow control valve plate is movably inserted in the valve body (1); The balanced flow control assembly further comprises a temperature-sensitive drive cylinder, which can drive the flow control valve plate to radially insert into the flow channel with a larger steam flow rate between the pilot leakage flow channel (4) and the valve opening flow channel (5) according to the difference in steam flow rates between the pilot leakage flow channel (4) and the valve opening flow channel (5), so as to reduce the steam flow rate of the corresponding flow channel.

2. The high pressure differential steam vent valve according to claim 1, characterized in that: A pilot seat hole (13) adapted to the pilot valve core (11) is provided at the bottom of the pilot installation cavity (10), so that the connection between the pilot installation cavity (10) and the air inlet cavity (7) is cut off through the cooperation between the pilot valve core (11) and the end of the pilot seat hole (13).

3. The high pressure differential steam vent valve according to claim 2, characterized in that: One end of the pilot valve core (11) facing the pilot seat hole (13) is in a shape that gradually shrinks along the axial direction of the pilot valve core (11).

4. The high pressure differential steam vent valve according to claim 2, characterized in that: The pilot installation cavity (10) is a cylindrical cavity with a narrowed upper end, and a pilot communication hole (14) is provided on the axial side of the pilot installation cavity (10); Two guide sealing rings (15) are axially spaced apart on the side wall of the pilot valve core (11); the two guide sealing rings (15) are arranged in the pilot communication hole (14) along the axial direction of the pilot installation cavity (10); A limiting convex shoulder (16) is provided at one end of the valve stem (12) facing the pilot valve core (11), and the limiting convex shoulder (16) is movably inserted in the pilot installation cavity (10) so as to drive the opening and closing valve core (9) to move through the cooperation between the limiting convex shoulder (16) and the constriction of the pilot installation cavity (10); A pilot spring (17) is arranged in the pilot installation cavity (10), and the acting force of the pilot spring (17) is between the limiting shoulder (16) and the bottom of the pilot installation cavity (10); Wherein, when the valve stem (12) moves to a limited position, the pilot leakage channel (4) is connected to the pilot chamber (8) through the pilot communication hole (14).

5. The high pressure differential steam vent valve according to claim 4, characterized in that: The limiting boss (16) is provided with a steam guide channel (18), and the steam guide channel (18) is used to connect the spaces on both sides of the limiting boss (16) axially opposite to each other.

6. The high pressure differential steam vent valve according to claim 1, characterized in that: The muffler structure comprises a buffer cylinder (19), wherein the buffer cylinder (19) is fixed in the discharge outlet (3), and the buffer cylinder (19) is arranged axially along the discharge outlet (3); The buffer cylinder (19) is closed at one end facing the discharge outlet (3) and is sealed and fixedly connected to the side wall of the discharge outlet (3) at the other end. The side wall of the buffer cylinder (19) is provided with a plurality of side exhaust holes (20), and the closed end of the buffer cylinder (19) is provided with an axial exhaust hole (21).

7. The high pressure differential steam vent valve according to claim 6, characterized in that: The noise reduction structure further comprises a spoiler tube (22), wherein the spoiler tube (22) is closed at one end facing the discharge outlet (3); The spoiler tube (22) is sleeved outside the buffer tube (19) at intervals, the spoiler tube (22) and the buffer tube (19) are coaxially arranged, and the side wall of the spoiler tube (22) is spaced apart from the side wall of the discharge outlet (3); The closed end of the spoiler cylinder (22) is provided with a plurality of steam outlets (23), the plurality of steam outlets (23) and the corresponding axial exhaust holes (21) are arranged alternately, and the total effective flow area of ​​the plurality of steam outlets (23) is smaller than the effective flow area of ​​the gap flow channel between the spoiler cylinder (22) and the buffer cylinder (19).

8. The high pressure differential steam vent valve according to claim 1, characterized in that: The flow control valve plate comprises a flow control rod section (24), and both ends of the flow control rod section (24) are provided with flow control plates (25); The temperature-sensitive drive cylinder comprises a drive cylinder body (26) with closed ends, a drive piston (27) being adapted in the drive cylinder body (26), the flow control rod segment (24) being inserted in the drive cylinder body (26), the flow control rod segment (24) being fixedly connected to the drive piston (27), and the axial direction of the drive cylinder body (26) being perpendicular to the flow direction of the pilot leakage flow channel (4) and the flow direction of the valve opening flow channel (5); The temperature-sensing drive cylinder further comprises a first temperature-sensing bag (28) and a second temperature-sensing bag (29), wherein the first temperature-sensing bag (28) and the second temperature-sensing bag (29) are both elastic energy storage temperature-sensing bags, and the first temperature-sensing bag (28) and the second temperature-sensing bag (29) have the same specifications, the first temperature-sensing bag (28) is arranged in the pilot leakage channel (4), and the side wall of the first temperature-sensing bag (28) is spaced apart from the side wall of the pilot leakage channel (4), and the second temperature-sensing bag (29) is arranged in the valve opening channel (5), and the side wall of the second temperature-sensing bag (29) is spaced apart from the side wall of the valve opening channel (5); The first temperature-sensing package (28) and the second temperature-sensing package (29) are both capable of containing temperature-sensitive working fluids, and the working fluid storage chamber of the first temperature-sensing package (28) is in communication with the inner chamber of one end of the driving cylinder (26) facing the valve opening flow channel (5), and the working fluid storage chamber of the second temperature-sensing package (29) is in communication with the inner chamber of one end of the driving cylinder (26) facing the pilot leakage flow channel (4).

9. The high pressure differential steam vent valve according to claim 8, characterized in that: The first temperature sensing package (28) comprises a temperature sensing shell (28a), and the temperature sensing shell (28a) is made of a heat-conducting material; A temperature sensing piston (28b) is adapted in the temperature sensing housing (28a), and the temperature sensing piston (28b) divides the inner cavity of the temperature sensing housing (28a) into a working fluid cavity (28c) and an elastic energy storage cavity (28d). An energy storage spring (28e) is arranged in the elastic energy storage cavity (28d), and the acting force of the energy storage spring (28e) is between the side wall of the temperature sensing piston (28b) and the inner side wall of the end of the temperature sensing housing (28a).

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