Angle type large-differential-pressure fused salt regulating valve

Abstract

The invention discloses an angle type large-pressure-difference fused salt regulating valve, belongs to the technical field of photo-thermal power generation and energy storage, and aims to solve the problems that an existing fused salt regulating valve is large in regulating pressure difference, and valve element vibration is easily caused. Comprising a valve body, a flow path of a medium is provided with a throttling sleeve assembly, the throttling sleeve assembly comprises a main valve sleeve, a fourth-stage valve sleeve, a third-stage valve sleeve, a second-stage valve sleeve and a first-stage valve sleeve which are sequentially connected to the main valve sleeve in an abutting and sleeving mode from inside to outside, and a plurality of throttling through holes are formed in the first-stage valve sleeve; a plurality of throttling stepped holes are formed in the fourth-stage valve sleeve, the third-stage valve sleeve, the second-stage valve sleeve and the main valve sleeve, each throttling stepped hole is composed of a shrinkage hole section and an expansion hole section which are connected inside and outside, and the throttling through holes are sequentially communicated with the throttling stepped holes in the second-stage valve sleeve, the third-stage valve sleeve, the fourth-stage valve sleeve and the main valve sleeve in a one-to-one correspondence mode. When a medium flows through the throttling sleeve assembly, energy consumed by the medium is larger, so that vibration of the valve element can be better restrained, and the effect of reducing noise of the valve is more obvious.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar thermal power generation and energy storage, and in particular relates to an angular large pressure difference molten salt regulating valve. Background Art

[0002] The large pressure difference molten salt regulating valve is installed in the molten salt pipeline under the tower of the solar thermal power generation unit. Its function is to control the flow of molten salt. The control performance of the large pressure difference molten salt regulating valve plays an extremely important role in the safe and reliable operation of the entire unit. The operating characteristics of the large pressure difference molten salt regulating valve are: medium temperature 575℃, pressure difference 4~5MPa, and the flowing medium is binary or ternary molten salt.

[0003] At present, there are problems with large pressure difference molten salt regulating valves: Due to the large pressure difference of large pressure difference molten salt regulating valves, the existing single-stage window throttling method is very easy to cause valve core vibration. Some use labyrinth disc throttling, which is easy to cause blockage and salt accumulation, and the flow capacity of labyrinth regulating valves with the same caliber is small and cannot meet the flow requirements of the unit; the existing valve middle flange is sealed with a spiral wound gasket. Due to the high temperature of the medium during the day and the low temperature during shutdown at night, the spiral wound gasket is in a temperature alternating environment for a long time and fails, causing the middle flange medium leakage; due to the high temperature of the medium and the high density of molten salt, the gap between the existing valve core and the sleeve is too large, causing the valve to vibrate and make a lot of noise, and the gap between the valve core and the sleeve is too small, causing the valve stem to be stuck and difficult to move.

[0004] Therefore, it is crucial to solve the bottleneck problem of large pressure difference molten salt regulating valve and propose a structural design of angle type large pressure difference molten salt regulating valve. Summary of the invention

[0005] The purpose of the present invention is to provide an angle-type large pressure difference molten salt regulating valve to solve the problem that the existing molten salt regulating valve has a large pressure difference and is very likely to cause valve core vibration. The technical solution adopted by the present invention is as follows:

[0006] An angle-type large pressure difference molten salt regulating valve comprises a valve body, a valve stem and a valve core, the valve body is provided with a valve cavity, the upper opening, the lower opening and the side opening of the valve body are connected through the valve cavity, the side opening of the valve body is a medium inlet, the lower opening of the valve body is a medium outlet, a valve seat and a pressure reducing sound-absorbing orifice plate are arranged above and below in the diameter of the medium outlet, a pressure reducing sound-absorbing orifice plate is arranged in the diameter of the medium inlet, a plurality of pressure reducing holes are arranged on the pressure reducing sound-absorbing orifice plate, and a valve cover closes the upper opening;

[0007] The throttling sleeve assembly comprises a main valve sleeve, a fourth-level valve sleeve, a third-level valve sleeve, a second-level valve sleeve and a first-level valve sleeve which are sleeved on the main valve sleeve in sequence from the inside to the outside, a plurality of throttling flow holes are arranged on the first-level valve sleeve, and a plurality of throttling stepped holes are arranged on the fourth-level valve sleeve, the third-level valve sleeve, the second-level valve sleeve and the main valve sleeve, the throttling stepped hole is composed of a contraction hole section and an expansion hole section which are connected inside and outside, the diameter of the expansion hole section is larger than the diameter of the contraction hole section, the diameter of the contraction hole section is equal to the diameter of the throttling flow hole, a plurality of the throttling flow holes, a plurality of the throttling stepped holes on the second-level valve sleeve, a plurality of the throttling stepped holes on the third-level valve sleeve, a plurality of the throttling stepped holes on the fourth-level valve sleeve and a plurality of the throttling stepped holes on the main valve sleeve are connected in sequence in a one-to-one correspondence, the lower side of the throttling flow hole is aligned with the lower side of the corresponding expansion hole section on the second-level valve sleeve, and the lower sides of the contraction hole sections on the second-level valve sleeve, the third-level valve sleeve and the fourth-level valve sleeve are all aligned with the lower side of the corresponding expansion hole section on the inner circumference;

[0008] The upper end of the main valve sleeve is connected to the valve cover, the inner periphery of the bottom of the main valve sleeve cooperates with the outer periphery of the valve seat, the first-level valve sleeve is located in the valve cavity, and a working space is provided between the outer periphery of the first-level valve sleeve and the side wall of the valve cavity. The outer periphery of the valve core slides with the inner periphery of the main valve sleeve to close or open a number of throttling stepped holes on the main valve sleeve, the top end of the inner periphery of the valve seat is provided with a first sealing cone surface, and the bottom end of the outer periphery of the valve core is provided with a second sealing cone surface, the first sealing cone surface and the second sealing cone surface are abutted against each other for sealing or separation, the lower end of the valve stem is connected to the valve core, and the upper end of the valve stem passes through the valve cover and slides and seals with the valve cover.

[0009] Furthermore, the inner hole of the valve seat is composed of a straight hole section and a tapered hole section connected up and down, and the valve seat is connected to the valve body by welding.

[0010] Furthermore, the main valve sleeve is welded and sealed to the valve cover.

[0011] Furthermore, the pressure-reducing silencer orifice plate includes an outer ring plate portion, a cone sleeve portion and a center circular plate portion, the small diameter end of the cone sleeve portion is connected to the outer periphery of the center circular plate portion, the large diameter end of the cone sleeve portion is connected to the inner periphery of the outer ring plate portion, the center circular plate portion is raised against the medium flow direction, the pressure-reducing holes on the outer ring plate portion are arranged perpendicular to the outer ring plate portion, the pressure-reducing holes on the cone sleeve portion are arranged perpendicular to the side wall of the cone sleeve portion, and the pressure-reducing holes on the center circular plate portion are arranged perpendicular to the center circular plate portion.

[0012] Furthermore, the lower end of the valve stem is provided with a conical structure which gradually converges from bottom to top, and the axis of the valve core is provided with a conical hole structure which gradually converges from bottom to top, the conical structure cooperates with the conical hole structure, a clamping ring is threadedly sleeved on the valve stem, the valve cover and the clamping ring are connected by a conical pin, and the lower end surface of the clamping ring is abutted against the upper end surface of the valve core.

[0013] Furthermore, a heat-conducting column structure is provided on the upper end surface of the valve cover, and the valve stem passes through the valve cover through the heat-conducting column structure, and a heating device is wound around the heat-conducting column.

[0014] Furthermore, a stuffing box is processed on the upper end surface of the heat-conducting column structure, and the valve stem passes through the valve cover from the stuffing box. A stuffing assembly is provided in the stuffing box, and the stuffing gland is connected to the valve cover. The stuffing gland presses the stuffing assembly onto the bottom surface of the stuffing box through a pressing sleeve, and the valve cover and the valve stem are slidably sealed through the stuffing assembly.

[0015] Furthermore, the diameter of the expansion hole section is 2 to 3 times the diameter of the contraction hole section.

[0016] Furthermore, three annular grooves are processed on the upper outer circle of the valve core, and metal piston rings are installed in the annular grooves. The valve core slides with the inner circumference of the main valve sleeve through the three metal piston rings, and a number of balance holes that are transparent from top to bottom are drilled on the valve core.

[0017] Furthermore, the valve cover and the valve body are connected by an octagonal gasket seal, and a concave stop is processed on the lower end surface of the main valve sleeve. The circumference of the concave stop cooperates with the outer circumference of the valve seat, and a gap is provided between the end surface of the concave stop and the upper end surface of the valve seat.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Sufficient space is provided between the throttling sleeve assembly and the valve cavity, so that the medium can evenly pass through the throttling sleeve assembly from the surrounding and be decompressed. The pressure-reducing and muffler orifice plate at the medium inlet can undertake part of the pressure-reducing task, thereby helping to reduce the vibration of the throttling sleeve assembly. The contraction hole section can decompress and throttle the medium, and the expansion hole section can fully expand the medium. When the medium flows through the throttling sleeve assembly, it flows through the corresponding throttling flow hole, several throttling step holes on the secondary valve sleeve, several throttling step holes on the tertiary valve sleeve, several throttling step holes on the quaternary valve sleeve, and several throttling step holes on the main valve sleeve in sequence, so that the medium is throttled once first. The pressure is reduced, and then it undergoes four times of expansion followed by throttling. The reduced pressure differential of the medium flowing through the throttling sleeve assembly is borne jointly by the main valve sleeve, the fourth-level valve sleeve, the third-level valve sleeve, the second-level valve sleeve and the first-level valve sleeve. Since the lower side of the throttling flow hole is aligned with the lower side of the expansion hole section corresponding to the second-level valve sleeve, the lower sides of the contraction hole sections on the second-level valve sleeve, the third-level valve sleeve and the fourth-level valve sleeve are all aligned with the lower side of the expansion hole section corresponding to the inner circumference. Compared with the prior art, when the medium flows through the throttling sleeve assembly, the flow direction of the medium is forced to be upward, the resistance that the medium needs to overcome is greater, and the energy consumed by the medium is greater, thereby better suppressing the vibration of the valve core and more significantly reducing the valve noise.

[0020] 2. The cone angle of the cone sleeve of the pressure-reducing and silencer orifice plate is 120° to 160°, which is used to change the flow direction of the medium, effectively avoid the impact force of the medium on the throttling sleeve assembly after entering the valve body from the medium inlet, and make the medium converge to the center when flowing from the medium outlet to the valve body, so as to reduce the scouring of the inner wall of the pipeline by the medium, and play a role in protecting the pipeline. In the prior art, the conical pressure-stabilizing and noise-reducing plate does not have a pressure-reducing hole on the edge. After research, it was found that if all the pressure-reducing holes are set perpendicular to the conical surface, when the medium flows through the conical pressure-stabilizing and noise-reducing plate, an obvious vortex will be formed on the rear edge of the conical pressure-stabilizing and noise-reducing plate, causing the medium to rub and impact the valve body or the inner wall of the pipeline, aggravating the wear of the valve body or the pipeline and generating noise. The medium streamlines at the outer edge of the pressure-reducing and silencer orifice plate of the present application are parallel to the pipeline, and the internal medium streamlines converge toward the center. The medium energy is consumed by interaction, which can reduce the impact force of the medium on downstream parts. Compared with the prior art, the pressure-reducing and silencer orifice plate of the present invention can eliminate the vortex formed on the pressure-reducing side and extend the service life of the valve body.

[0021] 3. The valve cover and the valve body are connected by fastening bolts. Tightening the bolts can make the octagonal gasket play a sealing role to avoid medium leakage at the connection between the valve body and the valve cover. The compression of the octagonal gasket is not limited by other parts. When the medium temperature is high during the day and the temperature is low during shutdown at night, the octagonal gasket fails in the temperature alternating environment. When the fastening bolts are further tightened, the octagonal gasket can be further compressed and deformed. An assembly gap of 3mm to 4mm is reserved between the end face of the concave stop and the upper end face of the valve seat to provide space for the main valve sleeve to move downward.

[0022] 4. Since the lower side of the throttling hole is aligned with the lower side of the expansion hole section corresponding to the secondary valve sleeve, the lower sides of the contraction hole sections on the secondary valve sleeve, the third valve sleeve and the fourth valve sleeve are all aligned with the lower sides of the expansion hole sections corresponding to the inner circumference, and the throttling hole is 1.5 mm lower than the corresponding contraction hole section on the main valve sleeve. The throttling hole to the throttling step hole on the corresponding main valve sleeve forms a stepped pressure reduction structure, which allows the molten salt medium to be freely discharged from the throttling hole under the action of gravity when the unit is stopped, thereby avoiding valve blockage and failure caused by molten salt crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 is a cross-sectional view of the throttle sleeve assembly;

[0025] Figure 3 yes Figure 1 A magnified image of point A;

[0026] Figure 4 It is a cross-sectional view of the pressure-reducing sound-absorbing orifice plate;

[0027] Figure 5It is the simulation analysis medium streamline diagram of the existing conical voltage stabilizing and noise reducing plate;

[0028] Figure 6 It is a simulation analysis medium streamline diagram of the inlet pressure reduction and silencer orifice plate of the present invention.

[0029] In the figure, 1. valve body, 2. pressure reducing silencer orifice plate, 21. center circular plate portion, 22. cone sleeve portion, 23. outer ring plate portion, 24. pressure reducing hole, 3. valve seat, 4. packing gland, 5. throttling sleeve assembly, 51. first-level valve sleeve, 52. second-level valve sleeve, 53. third-level valve sleeve, 54. fourth-level valve sleeve, 55. main valve sleeve, 56. throttling stepped hole, 6. valve core, 7. metal piston ring, 8. clamping ring, 9. tapered pin, 10. valve stem, 11. octagonal gasket, 12. heating device, 13. valve cover, 14. packing assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0033] Example: Figure 1 to Figure 6 As shown, an angle-type large pressure difference molten salt regulating valve comprises a valve body 1, a valve stem 10 and a valve core 6, the valve body 1 is provided with a valve cavity, the upper opening, the lower opening and the side opening of the valve body 1 are connected through the valve cavity, the side opening of the valve body 1 is a medium inlet, the lower opening of the valve body 1 is a medium outlet, a valve seat 3 and a pressure reducing and sound-absorbing orifice plate 2 are arranged in the upper and lower parts of the medium outlet, a pressure reducing and sound-absorbing orifice plate 2 is arranged on the medium inlet, a plurality of pressure reducing holes 24 are arranged on the pressure reducing and sound-absorbing orifice plate 2, and a valve cover 13 closes the upper opening;

[0034] The throttling sleeve assembly 5 comprises a main valve sleeve 55, a fourth-stage valve sleeve 54, a third-stage valve sleeve 53, a second-stage valve sleeve 52 and a first-stage valve sleeve 51 which are sleeved on the main valve sleeve 55 in sequence from the inside to the outside, a plurality of throttling flow holes are arranged on the first-stage valve sleeve 51, and a plurality of throttling stepped holes 56 are arranged on the fourth-stage valve sleeve 54, the third-stage valve sleeve 53, the second-stage valve sleeve 52 and the main valve sleeve 55. The throttling stepped hole 56 is composed of a contraction hole section and an expansion hole section which are connected inside and outside. The diameter of the expansion hole section is larger than the diameter of the contraction hole section, and the diameter of the contraction hole section is the same as the diameter of the throttling hole section. The diameters of the flow holes are equal, and the throttling flow holes, the throttling step holes 56 on the secondary valve sleeve 52, the throttling step holes 56 on the tertiary valve sleeve 53, the throttling step holes 56 on the quaternary valve sleeve 54 and the throttling step holes 56 on the main valve sleeve 55 are connected in sequence one by one, and the lower side of the throttling flow holes is aligned with the lower side of the corresponding expansion hole section on the secondary valve sleeve 52, and the lower sides of the contraction hole sections on the secondary valve sleeve 52, the tertiary valve sleeve 53 and the quaternary valve sleeve 54 are all aligned with the lower side of the corresponding expansion hole section on the inner circumference;

[0035] The upper end of the main valve sleeve 55 is connected to the valve cover 13, and the inner periphery of the bottom of the main valve sleeve 55 cooperates with the outer periphery of the valve seat 3. The first-stage valve sleeve 51 is located in the valve cavity, and a working space is provided between the outer periphery of the first-stage valve sleeve 51 and the side wall of the valve cavity. The outer periphery of the valve core 6 slides with the inner periphery of the main valve sleeve 55 to close or open a plurality of throttling stepped holes 56 on the main valve sleeve 55. The top end of the inner periphery of the valve seat 3 is provided with a first sealing cone surface, and the bottom end of the outer periphery of the valve core 6 is provided with a second sealing cone surface. The first sealing cone surface and the second sealing cone surface are abutted against each other for sealing or separation. The lower end of the valve stem 10 is connected to the valve core 6, and the upper end of the valve stem 10 passes through the valve cover 13 and slides and seals with the valve cover 13. The actuator is installed on the valve cover 13 through a bracket, and the upper end of the valve stem 10 is threadedly connected to the output end of the actuator.

[0036] There is enough space between the throttling sleeve assembly 5 and the valve cavity, so that the medium can evenly pass through the throttling sleeve assembly 5 from the surrounding and be decompressed. The pressure-reducing and muffler orifice plate 2 at the medium inlet can undertake part of the pressure-reducing task, thereby helping to reduce the vibration of the throttling sleeve assembly 5. The contraction hole section can decompress and throttle the medium, and the expansion hole section can fully expand the medium. When the medium flows through the throttling sleeve assembly 5, it flows through the corresponding throttling flow hole, the several throttling step holes 56 on the secondary valve sleeve 52, the several throttling step holes 56 on the third valve sleeve 53, the several throttling step holes 56 on the fourth valve sleeve 54 and the several throttling step holes 56 on the main valve sleeve 55 in sequence, so that the medium first obtains a throttling and decompression The pressure difference of the medium flowing through the throttling sleeve assembly 5 is borne jointly by the main valve sleeve 55, the fourth-level valve sleeve 54, the third-level valve sleeve 53, the second-level valve sleeve 52 and the first-level valve sleeve 51. Since the lower side of the throttling flow hole is aligned with the lower side of the expansion hole section corresponding to the second-level valve sleeve 52, the lower sides of the contraction hole sections on the second-level valve sleeve 52, the third-level valve sleeve 53 and the fourth-level valve sleeve 54 are all aligned with the lower side of the expansion hole section corresponding to the inner circumference. Compared with the prior art, when the medium flows through the throttling sleeve assembly 5, the flow direction of the medium is forced to be upward, the resistance that the medium needs to overcome is greater, and the energy consumed by the medium is greater, so that the vibration of the valve core 6 can be better suppressed and the effect of reducing the valve noise is more obvious.

[0037] The operating environment of the present invention is as follows: when the unit is running during the day, the temperature of the molten salt medium flowing through the present invention is about 575° C., and the unit stops running at night.

[0038] Since the lower side of the throttling hole is aligned with the lower side of the expansion hole section corresponding to the secondary valve sleeve 52, the lower sides of the contraction hole sections on the secondary valve sleeve 52, the third valve sleeve 53 and the fourth valve sleeve 54 are all aligned with the lower side of the expansion hole section corresponding to the inner circumference, the throttling hole is 1.5 mm lower than the corresponding contraction hole section on the main valve sleeve 55, and a pressure reduction structure arranged in a stepped manner is formed from the throttling hole to the throttling stepped hole 56 on the corresponding main valve sleeve 55, so that when the unit is stopped, the molten salt medium can be freely discharged from the throttling hole under the action of gravity, thereby avoiding valve clogging and failure caused by crystallization of the molten salt; when the opening is below 20%, the throttling holes are small and evenly distributed, and when the opening is above 20%, the aperture is large and evenly distributed, so that the valve adjustment characteristics are corrected linear, the adjustable ratio of the valve is increased, and high-precision adjustment can be achieved under both minimum and maximum operating conditions.

[0039] The inner hole of the valve seat 3 is composed of a straight hole section and a tapered hole section connected up and down, so that the outlet medium can slowly expand and gradually reduce the medium flow rate, avoiding valve vibration caused by high flow rate. The valve seat 3 is welded to the valve body 1, reducing internal leakage points and improving sealing performance.

[0040] The main valve sleeve 55 is welded and sealed to the valve cover 13 to reduce leakage points between the throttling sleeve assembly 5 and the valve core 6.

[0041] The pressure reducing sound-absorbing orifice plate 2 comprises an outer ring plate portion 23, a cone sleeve portion 22 and a central circular plate portion 21. The small diameter end of the cone sleeve portion 22 is connected to the outer periphery of the central circular plate portion 21, and the large diameter end of the cone sleeve portion 22 is connected to the inner periphery of the outer ring plate portion 23. The central circular plate portion 21 is raised against the flow direction of the medium. The pressure reducing holes 24 on the outer ring plate portion 23 are arranged perpendicular to the outer ring plate portion 23, the pressure reducing holes 24 on the cone sleeve portion 22 are arranged perpendicular to the side wall of the cone sleeve portion 22, and the pressure reducing holes 24 on the central circular plate portion 21 are arranged perpendicular to the central circular plate portion 21. The cone angle of the cone sleeve portion 22 is 120° to 160°, which is used to change the flow direction of the medium, effectively avoid the impact force of the medium on the throttling sleeve assembly 5 after entering the valve body 1 from the medium inlet, and can make the medium converge to the center when flowing from the medium outlet to the valve body 1, so as to reduce the scouring of the inner wall of the pipeline by the medium, and play a role in protecting the pipeline. In the prior art, a Chinese invention patent with publication number CN 116006767A discloses a novel multi-stage adjustable pressure-reducing regulating valve and a conical pressure-stabilizing and noise-reducing plate. The difference between the conical pressure-stabilizing and noise-reducing plate and the pressure-reducing and noise-reducing orifice plate 2 of the present application is that the conical pressure-stabilizing and noise-reducing plate does not have a pressure-reducing hole 24 at the edge. After research, it is found that if all the pressure-reducing holes 24 are arranged perpendicular to the conical surface, when the medium flows through the conical pressure-stabilizing and noise-reducing plate, an obvious vortex will be formed at the rear edge of the conical pressure-stabilizing and noise-reducing plate. Figure 5 The medium streamline diagram extracted through simulation analysis is given, and it can be seen that obvious vortices are formed at the rear edge of the conical voltage-stabilizing and noise-reducing plate, causing the medium to rub and impact the inner wall of the valve body 1, aggravating the wear of the pipeline and generating noise. Figure 6 The medium streamline diagram extracted by simulation analysis of the pressure-reducing and silencer orifice plate 2 of the present application is given. It can be seen that the medium streamlines at the outer edge are parallel to the pipeline, and the internal medium streamlines converge toward the center. The medium energy is consumed by interaction, which can reduce the impact force of the medium on downstream parts. Compared with the prior art, the pressure-reducing and silencer orifice plate 2 in the present invention can eliminate the vortex formed on the pressure-reducing side and extend the service life of the valve body 1.

[0042] The lower end of the valve stem 10 is provided with a frustum structure which gradually converges from bottom to top, and the axis of the valve core 6 is provided with a conical hole structure which gradually converges from bottom to top, the frustum structure cooperates with the conical hole structure, a clamping ring 8 is threadedly sleeved on the valve stem 10, the valve cover 13 and the clamping ring 8 are pin-connected by a conical pin 9, and the lower end surface of the clamping ring 8 is abutted against the upper end surface of the valve core 6.

[0043] A heat-conducting column structure is provided on the upper end surface of the valve cover 13, and the valve stem 10 passes through the valve cover 13 through the heat-conducting column structure, and a heat tracing device 12 is wound around the heat-conducting column. The upper end surface of the heat tracing device 12 is slightly higher than the lowermost end of the packing assembly 14 to prevent the molten salt medium from crystallizing and affecting the sealing performance of the packing assembly 14.

[0044] A stuffing box is machined on the upper end surface of the heat-conducting column structure, and the valve stem 10 passes through the valve cover 13 through the stuffing box. A stuffing assembly 14 is arranged in the stuffing box, and a stuffing gland 4 is connected to the valve cover 13. The stuffing gland 4 presses the stuffing assembly 14 on the bottom surface of the stuffing box through a press sleeve, and the valve cover 13 and the valve stem 10 are slidably sealed through the stuffing assembly 14. The stuffing assembly 14 is a special stuffing assembly for molten salt, which can effectively prevent the leakage of the medium.

[0045] The diameter of the expansion hole section is 2 to 3 times the diameter of the contraction hole section.

[0046] Three annular grooves are machined on the outer circle of the valve core 6, and metal piston rings 7 are installed in the annular grooves. The valve core 6 slides with the inner circumference of the main valve sleeve 55 through the three metal piston rings 7, so that the valve core 6 is guided in the entire stroke, which not only avoids jamming, but also solves the problem of valve core 6 vibration. A number of vertically transparent balancing holes are drilled on the valve core 6. The valve cavities on the upper and lower sides of the valve core 6 are connected to avoid unbalanced force on the valve core 6.

[0047] The valve cover 13 and the valve body 1 are sealed and connected by the octagonal gasket 11. A concave stopper is processed on the lower end surface of the main valve sleeve 55. The circumference of the concave stopper is slidably matched with the outer circumference of the valve seat 3. A gap is provided between the end surface of the concave stopper and the upper end surface of the valve seat 3. The valve cover 13 and the valve body 1 are connected by fastening bolts. Tightening the bolts can make the octagonal gasket 11 play a sealing role to avoid medium leakage at the connection between the valve body 1 and the valve cover 13. The compression amount of the octagonal gasket 11 is not limited by other parts. When the octagonal gasket 11 fails in the temperature alternating environment due to the high temperature of the medium during the day and the low temperature during shutdown at night, the octagonal gasket 11 can be further compressed and deformed when the fastening bolts are further tightened. An assembly gap of 3mm to 4mm is reserved between the end surface of the concave stopper and the upper end surface of the valve seat 3 to provide space for the main valve sleeve 55 to move downward.

[0048] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. An angle-type large pressure difference molten salt regulating valve, comprising a valve body (1), a valve stem (10) and a valve core (6), characterized in that: The valve body (1) is provided with a valve cavity, and the upper opening, lower opening and side opening of the valve body (1) are connected through the valve cavity. The side opening of the valve body (1) is a medium inlet, and the lower opening of the valve body (1) is a medium outlet. A valve seat (3) and a pressure-reducing and sound-reducing orifice plate (2) are arranged above and below in the diameter of the medium outlet. A pressure-reducing and sound-reducing orifice plate (2) is arranged in the diameter of the medium inlet, and a plurality of pressure-reducing holes (24) are arranged on the pressure-reducing and sound-reducing orifice plate (2). The valve cover (13) closes the upper opening; The throttling sleeve assembly (5) comprises a main valve sleeve (55), a fourth-stage valve sleeve (54), a third-stage valve sleeve (53), a second-stage valve sleeve (52) and a first-stage valve sleeve (51) which are sleeved on the main valve sleeve (55) in sequence from the inside to the outside, a plurality of throttling flow holes are arranged on the first-stage valve sleeve (51), and a plurality of throttling step holes (56) are arranged on the fourth-stage valve sleeve (54), the third-stage valve sleeve (53), the second-stage valve sleeve (52) and the main valve sleeve (55), the throttling step holes (56) are composed of a contraction hole section and an expansion hole section which are connected inside and outside, the diameter of the expansion hole section is larger than the diameter of the contraction hole section, and the diameter of the contraction hole section is equal to the diameter of the contraction hole section. The diameters of the throttling holes are equal, and the throttling holes, the throttling step holes (56) on the secondary valve sleeve (52), the throttling step holes (56) on the tertiary valve sleeve (53), the throttling step holes (56) on the quaternary valve sleeve (54) and the throttling step holes (56) on the main valve sleeve (55) are connected in sequence one by one, and the lower side of the throttling holes is aligned with the lower side of the corresponding expansion hole section on the secondary valve sleeve (52), and the lower sides of the contraction hole sections on the secondary valve sleeve (52), the tertiary valve sleeve (53) and the quaternary valve sleeve (54) are all aligned with the lower side of the corresponding expansion hole section on the inner circumference; The upper end of the main valve sleeve (55) is connected to the valve cover (13), the inner circumference of the bottom of the main valve sleeve (55) cooperates with the outer circumference of the valve seat (3), the first-stage valve sleeve (51) is located in the valve cavity, and a working space is provided between the outer circumference of the first-stage valve sleeve (51) and the side wall of the valve cavity. The outer circumference of the valve core (6) is slidably matched with the inner circumference of the main valve sleeve (55) to close or open a plurality of throttling stepped holes (56) on the main valve sleeve (55). The top end of the inner circumference of the valve seat (3) is provided with a first sealing cone surface, and the bottom end of the outer circumference of the valve core (6) is provided with a second sealing cone surface. The first sealing cone surface and the second sealing cone surface are abutted against each other for sealing or separation. The lower end of the valve stem (10) is connected to the valve core (6), and the upper end of the valve stem (10) passes through the valve cover (13) and is slidably matched with the valve cover (13).

2. The angle-type large pressure difference molten salt regulating valve according to claim 1 is characterized in that: The inner hole of the valve seat (3) is composed of a straight hole section and a tapered hole section connected up and down, and the valve seat (3) is connected to the valve body (1) by welding.

3. The angle-type large pressure difference molten salt regulating valve according to claim 1 is characterized in that: The main valve sleeve (55) is welded and sealed to the valve cover (13).

4. The angle-type large pressure difference molten salt regulating valve according to claim 1 is characterized in that: The pressure reducing sound-absorbing orifice plate (2) comprises an outer ring plate portion (23), a cone sleeve portion (22) and a central circular plate portion (21); the small diameter end of the cone sleeve portion (22) is connected to the outer periphery of the central circular plate portion (21); the large diameter end of the cone sleeve portion (22) is connected to the inner periphery of the outer ring plate portion (23); the central circular plate portion (21) is raised against the flow direction of the medium; the pressure reducing holes (24) on the outer ring plate portion (23) are arranged perpendicular to the outer ring plate portion (23); the pressure reducing holes (24) on the cone sleeve portion (22) are arranged perpendicular to the side wall of the cone sleeve portion (22); and the pressure reducing holes (24) on the central circular plate portion (21) are arranged perpendicular to the central circular plate portion (21).

5. The angle-type large pressure difference molten salt regulating valve according to claim 1 is characterized in that: The lower end of the valve stem (10) is provided with a conical structure that gradually converges from bottom to top, and the axis of the valve core (6) is provided with a conical hole structure that gradually converges from bottom to top. The conical structure and the conical hole structure cooperate with each other. A clamping ring (8) is threadedly sleeved on the valve stem (10), and the valve cover (13) and the clamping ring (8) are connected by a conical pin (9). The lower end surface of the clamping ring (8) is abutted against the upper end surface of the valve core (6).

6. The angle-type large pressure difference molten salt regulating valve according to claim 1, characterized in that: A heat-conducting column structure is provided on the upper end surface of the valve cover (13), and the valve stem (10) passes through the valve cover (13) through the heat-conducting column structure, and a heating device (12) is wound around the heat-conducting column.

7. The angle-type large pressure difference molten salt regulating valve according to claim 6 is characterized in that: A stuffing box is processed on the upper end surface of the heat-conducting column structure, and the valve stem (10) passes through the valve cover (13) from the stuffing box. A stuffing assembly (14) is arranged in the stuffing box. The stuffing gland (4) is connected to the valve cover (13). The stuffing gland (4) presses the stuffing assembly (14) onto the bottom surface of the stuffing box through a pressing sleeve. The valve cover (13) and the valve stem (10) are slidably sealed through the stuffing assembly (14).

8. The angle-type large pressure difference molten salt regulating valve according to claim 1, characterized in that: The diameter of the expansion hole section is 2 to 3 times the diameter of the contraction hole section.

9. The angle-type large pressure difference molten salt regulating valve according to claim 1, characterized in that: Three annular grooves are machined on the outer circumference of the valve core (6), and metal piston rings (7) are installed in the annular grooves. The valve core (6) is slidably matched with the inner circumference of the main valve sleeve (55) through the three metal piston rings (7). A plurality of balance holes that are transparent from top to bottom are drilled on the valve core (6).

10. An angle type large pressure difference molten salt regulating valve according to any one of claims 1 to 9, characterized in that: The valve cover (13) and the valve body (1) are sealed and connected via an octagonal gasket (11); a concave stop is machined on the lower end surface of the main valve sleeve (55); the circumference of the concave stop matches the outer circumference of the valve seat (3); and a gap is provided between the end surface of the concave stop and the upper end surface of the valve seat (3).

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