Molten salt control valve

Abstract

The utility model discloses a fused salt control valve which comprises a valve body, a valve cover and a valve internal part, an installation hole for the valve internal part to enter is formed in the top of the valve body, the radial section structure of the installation hole is matched with the radial section structure of the valve internal part, and the valve cover is detachably installed at the installation hole. A medium inflow channel and a medium outflow channel which are communicated with each other are formed in the valve body, and a communication port is formed between the medium inflow channel and the medium outflow channel; the valve internal part comprises a valve seat, the valve seat is installed at the communicating opening in a sealed mode, a medium passing opening with the axis vertically extending is formed in the valve seat, the medium passing opening is provided with a valve element for closing or opening the medium passing opening in a matched mode, the valve element is movably installed in the valve body in the vertical direction, and the whole top face of the valve element is of a slope-shaped structure used for gathering fused salt. And the molten salt gradually gathers towards the axis of the valve core from top to bottom, so that the molten salt crystallization can be fully prevented from influencing the movement of the valve core, and the technical problem that the opening of the molten salt control valve is easily influenced by the molten salt crystallization in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a molten salt control valve. Background Art

[0002] The molten salt control valve is a throttling or regulating element used in solar thermal power generation projects. The working medium is solar molten salt with a storage medium of 60% NaNO 3 mixed with 40% KNO 3 Since this medium is prone to crystallization, resulting in the abnormal use of the control valve, when the control valve is used in molten salt conditions, in addition to ensuring its original functions, external temperature control of the control valve is also required, which inevitably causes energy loss problems; in addition, for the problem that the molten salt medium is prone to leakage at seals such as packing or gaskets, the packing or gaskets and other seals need to be frequently replaced on site, and the regular maintenance workload is very large. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a molten salt control valve to solve the problems existing in the above-mentioned prior art, so as to fully avoid the influence of molten salt crystallization on the movement of the valve core, and further solve the technical problem that the molten salt control valve in the prior art is easily affected by molten salt crystallization in its opening.

[0004] To achieve the above purpose, the utility model provides the following scheme: The utility model provides a molten salt control valve, including a valve body, a valve cover and valve internals. An installation hole for the valve internals to enter is opened at the top of the valve body, and the radial cross-sectional structure of the installation hole matches the radial cross-sectional structure of the valve internals. The valve cover is detachably installed at the installation hole. A medium inlet channel and a medium outlet channel are opened in the valve body and are communicated with each other, and a communication port is provided between the medium inlet channel and the medium outlet channel;

[0005] The valve internals include a valve seat, the valve seat is sealingly installed at the communication port, a medium through-hole with a vertically extending axis is opened on the valve seat, a valve core for closing or opening the medium through-hole is provided, the valve core is movably installed in the valve body along the vertical direction, and the top surface of the valve core is integrally in a slope-like structure for gathering molten salt and gradually converges towards the axis of the valve core from top to bottom.

[0006] Preferably, the valve internals further include a valve cage and a pressure cylinder both in a ring structure. The bottom end of the valve cage is coaxially abutted against the top end of the valve seat, and a diversion port communicating the medium through-hole with the medium outlet channel is opened on its outer peripheral wall. The bottom end of the pressure cylinder is coaxially abutted against the top end of the valve cage, the top end of the pressure cylinder is butted against the bottom end surface of the valve cover, and the top end surface of the pressure cylinder is in a slope-like structure and gradually converges towards the axis of the pressure cylinder from top to bottom.

[0007] Preferably, an annular notch is coaxially formed on the inner peripheral edge of the pressing cylinder, a first annular flange fitted in the annular notch is provided on the bottom surface of the valve cover, the bottom end surface of the annular notch is of a slope structure and gradually converges towards the axis of the pressing cylinder from top to bottom.

[0008] Preferably, a first supporting portion is coaxially surrounded on the outer peripheral side of the annular notch, a first pressing portion coaxially surrounded on the outer peripheral side of the first annular flange is provided on the bottom surface of the valve cover, the first supporting portion and the first pressing portion are in contact with each other, and a pressing cylinder gasket for sealing and in an annular structure is provided between the first supporting portion and the first pressing portion.

[0009] Preferably, a second pressing portion coaxially surrounded on the outer peripheral side of the first pressing portion is provided on the bottom surface of the valve cover, a second supporting portion surrounded on the outer peripheral side of the first supporting portion is provided on the valve body, the second supporting portion and the second pressing portion are in contact with each other, and a valve cover gasket for sealing and in an annular structure is provided between the second supporting portion and the second pressing portion.

[0010] Preferably, the first pressing portion and the second pressing portion are staggered in the vertical direction, and the second pressing portion is located above the first pressing portion.

[0011] Preferably, both the pressing cylinder gasket and the valve cover gasket are metal wound gaskets.

[0012] Preferably, a second annular flange for receiving the valve cage is provided on the outer peripheral edge of the valve seat, a first annular groove located below the medium outflow channel is formed on the valve body, the second annular flange is fitted in the first annular groove, and a first C-shaped sealing ring is provided between the second annular flange and the first annular groove.

[0013] Preferably, a third annular flange is coaxially provided on the inner peripheral edge of the top end of the valve cage, a second annular groove fitted with the third annular flange is coaxially formed on the inner peripheral edge of the bottom end of the pressing cylinder, and a second C-shaped sealing ring is provided between the third annular flange and the second annular groove.

[0014] Preferably, the valve core is provided with a valve rod for driving its movement, a valve cover through hole for the valve rod to extend upward is formed on the valve cover, a packing groove surrounding the valve rod is formed at the top position of the inner peripheral wall of the valve cover through hole, packing is filled in the packing groove, and a packing gland assembly for compacting the packing is provided at the top of the packing groove.

[0015] The present utility model has achieved the following technical effects compared with the prior art:

[0016] By setting the top surface of the valve core in a slope-like structure, during the opening and closing process of the valve core, the molten salt gathered at the outer peripheral edge of the top of the valve core can flow along the top surface of the valve core and gather at the central position of the top surface of the valve core, avoiding the gathering of molten salt at the outer peripheral edge of the top of the valve core, which is likely to cause the crystallization of molten salt, resulting in the crystallization of molten salt connecting the valve core and the components on its outer peripheral side, making it difficult for the valve core to move, and further causing the control valve to be unable to be used normally. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the molten salt control valve of the present invention and an enlarged view of a partial structure at the valve internals;

[0019] Figure 2 It is a schematic diagram of the valve core structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the pressure cylinder structure of the present invention and an enlarged view of a partial structure at its top;

[0021] Figure 4 It is a schematic diagram of the structure at the top end of the through hole of the valve cover of the present invention;

[0022] Figure 5 It is a schematic diagram of the valve cage structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure at the bottom end of the through hole of the valve cover of the present invention;

[0024] Wherein, 1 - valve body, 2 - valve cover, 3 - valve seat, 4 - valve core, 5 - valve cage, 6 - pressure cylinder, 7 - packing, 8 - valve cover gasket, 9 - pressure cylinder gasket, 10 - first C-shaped sealing ring, 11 - second C-shaped sealing ring, 12 - top surface of the valve core, 13 - top surface of the pressure cylinder, 14 - packing gland assembly, 15 - temperature measuring hole, 16 - guide sleeve, 17 - guide sleeve. Detailed Embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] The purpose of the present utility model is to provide a molten salt control valve to solve the problems existing in the above-mentioned prior art, so as to fully avoid the influence of molten salt crystallization on the movement of the valve core, and further solve the technical problem that the molten salt control valve in the prior art is easily affected by molten salt crystallization and its opening.

[0027] To make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] As Figures 1 to 6 shown, this embodiment provides a molten salt control valve, including a valve body 1, a valve cover 2 and valve internals. An installation hole for the valve internals to enter is opened at the top of the valve body 1, and the radial cross-sectional structure of the installation hole matches the radial cross-sectional structure of the valve internals. The valve cover 2 is detachably installed at the installation hole. During the specific installation process, the valve internals extend into and are fitted in the installation hole. A medium inflow channel and a medium outflow channel are opened in the valve body 1 and are communicated with each other. A communication port is provided between the medium inflow channel and the medium outflow channel; a through hole communicating with the medium outflow channel is opened on the side wall of the hole passage of the installation hole, and the bottom of the hole passage of the installation hole is communicated with the communication port;

[0029] The valve internals include a valve seat 3, and the valve seat 3 is hermetically installed at the communication port. A medium through port with a vertically extending axis is opened on the valve seat 3. The medium through port is provided with a valve core 4 for closing or opening it. The valve core 4 is movably installed in the valve body 1 along the vertical direction. The top surface 12 of the valve core is integrally in a slope-like structure for gathering molten salt, and gradually converges towards the axis of the valve core 4 from top to bottom. The entire control valve is used for throttling and controlling solar molten salt, and the solar molten salt is prone to crystallization, resulting in the abnormal use of the control valve. By setting the top surface 12 of the valve core in a slope-like structure, the present utility model enables the molten salt gathered at the outer peripheral edge of the top of the valve core 4 to flow along the top surface 12 of the valve core during the opening and closing process of the valve core 4 and converge at the center position of the top surface 12 of the valve core, avoiding the gathering of molten salt at the outer peripheral edge of the top of the valve core 4, which is likely to cause molten salt crystallization, making the molten salt crystallization connect the valve core 4 with the components on its outer peripheral side, resulting in difficult movement of the valve core 4 and further causing the abnormal use of the control valve.

[0030] Further, the valve internals further include a valve cage 5 and a pressure cylinder 6 both having an annular structure. The bottom end of the valve cage 5 is coaxially abutted against the top end of the valve seat 3, and a diversion port communicating the medium inlet and the medium outflow channel is provided on its outer peripheral wall. The bottom end of the pressure cylinder 6 is coaxially abutted against the top end of the valve cage 5, and the top end of the pressure cylinder 6 is butted against the bottom end face of the valve cover 2. The top end face 13 of the pressure cylinder is of a ramp structure and gradually converges towards the axis of the pressure cylinder 6 from top to bottom. During the operation of the valve core 4, the valve core 4 is movably arranged inside the valve cage 5 and the pressure cylinder 6. When the valve core 4 is in the open state, the top face 12 of the valve core is flush with the top end of the pressure cylinder 6, and molten salt is likely to accumulate. Therefore, by setting the top end face 13 of the pressure cylinder to be of a ramp structure, the molten salt accumulated between the pressure cylinder 6 and the valve cover 2 slides down along the top end face 13 of the pressure cylinder, avoiding the accumulation of molten salt on the top end face 13 of the pressure cylinder, which is likely to crystallize and adhere to the valve core 4, causing difficulties in the movement of the valve core 4.

[0031] As a preferred embodiment of the present utility model, an annular notch is coaxially provided on the inner peripheral edge of the pressure cylinder 6, and a first annular flange fitted in the annular notch is provided on the bottom face of the valve cover 2. The bottom end face of the annular notch is of a ramp structure and gradually converges towards the axis of the pressure cylinder 6 from top to bottom. The valve cover 2 and the pressure cylinder 6 are mutually positioned by the engagement of the annular notch provided on the pressure cylinder 6 and the first annular flange of the valve cover 2, and the ramp structure on the pressure cylinder 6 is located at the annular notch to ensure the rapid flow and fall of molten salt.

[0032] Further, a first support portion is coaxially surrounded on the outer peripheral side of the annular notch, and a first pressing portion coaxially surrounded on the outer peripheral side of the first annular flange is provided on the bottom face of the valve cover 2. The first support portion and the first pressing portion are abutted against each other, and a pressure cylinder gasket 9 for sealing and having an annular structure is provided between the first support portion and the first pressing portion. Preferably, the pressure cylinder gasket 9 is a wound metal gasket to be heat-resistant on the premise of sealing and ensure the sealing effect; the pressure cylinder 6 and the valve cover 2 are sealed by providing the pressure cylinder gasket 9, and the pressure cylinder gasket 9 is located on the outer peripheral side of the first annular flange and the annular notch to fully block the overflow of molten salt.

[0033] Further, a second pressing portion coaxially surrounded on the outer peripheral side of the first pressing portion is provided on the bottom face of the valve cover 2, and a second support portion surrounded on the outer peripheral side of the first support portion is provided on the valve body 1. The second support portion and the second pressing portion are abutted against each other, and a valve cover gasket 8 for sealing and having an annular structure is provided between the second support portion and the second pressing portion. Preferably, the valve cover gasket 8 is a wound metal gasket to be heat-resistant on the premise of sealing and ensure the sealing effect; the gap between the valve cover 2 and the valve body 1 is sealed by providing the valve cover gasket 8.

[0034] Preferably, the first pressing portion and the second pressing portion are staggered in the vertical direction, and the second pressing portion is located above the first pressing portion, thereby realizing the staggered sealing of the valve cover 2 with the pressure cylinder 6 and the valve body 1 respectively and further improving the sealing effect.

[0035] Among them, the outer peripheral edge of the valve seat 3 is provided with a second annular flange for receiving the valve cage 5. A first annular groove is formed on the valve body 1 below the medium outflow channel. The second annular flange is fitted in the first annular groove, and a first C-shaped sealing ring 10 is provided between the second annular flange and the first annular groove. Preferably, the first C-shaped sealing ring 10 is made of Inconel 718 high-temperature resistant material, and the gap between the valve seat 3 and the valve cage 5 is sealed by the first C-shaped sealing ring 10.

[0036] Among them, a third annular flange is coaxially provided on the inner peripheral edge of the top end of the valve cage 5. A second annular groove is coaxially formed on the inner peripheral edge of the bottom end of the pressure cylinder 6 for fitting with the third annular flange. A second C-shaped sealing ring 11 is provided between the third annular flange and the second annular groove. Preferably, the second C-shaped sealing ring 11 is made of Inconel 718 high-temperature resistant material, and the gap between the pressure cylinder 6 and the valve cage 5 is sealed by the second C-shaped sealing ring 11.

[0037] Furthermore, the valve core 4 is equipped with a valve rod for driving its movement. A through hole of the valve cover 2 is formed on the valve cover 2 for the valve rod to extend upward. A packing 7 groove surrounding the valve rod is formed at the top position of the inner peripheral wall of the through hole of the valve cover 2. The packing 7 groove is filled with packing 7. A packing gland assembly 14 for compacting the packing 7 is provided at the top of the packing 7 groove. Preferably, the packing gland assembly 14 is a self-compensating packing gland assembly 14, which can utilize the stress of the elastic deformation of its disc spring to compensate for the gap generated by the wear of the packing 7, so that the packing 7 remains in a sealed state for a long time. And a temperature measuring hole 15 is formed at the position corresponding to the lower part of the packing 7 on the valve cover 2. A temperature measuring element can be connected through the reserved temperature measuring hole 15 to monitor the temperature of the molten salt at the bottom of the packing 7. Preferably, an annular groove is formed at the bottom end position of the through hole of the valve cover 2, and the annular groove surrounds the outer peripheral side of the valve rod. A guide sleeve 1716 slidably sleeved on the valve rod is coaxially fitted in the annular groove. A plurality of through holes are formed on the guide sleeve 1716, and the through holes penetrate through the guide sleeve 1716 in the vertical direction and are equally spaced around the outer peripheral side of the valve rod. The through holes are formed to prevent the salt from solidifying inside the valve cover 2.

[0038] Adaptations made according to actual needs are all within the protection scope of the present utility model.

[0039] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0040] Specific examples are used in the present utility model to elaborate on the principles and implementation manners of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present utility model.

Claims

1. A molten salt control valve, characterized in that, It includes a valve body, a valve cover and valve internals. An installation hole for the valve internals to enter is provided at the top of the valve body, and the radial cross-sectional structure of the installation hole matches the radial cross-sectional structure of the valve internals. The valve cover is detachably installed at the installation hole. A medium inflow channel and a medium outflow channel that are connected and communicated are provided in the valve body, and a communication port is provided between the medium inflow channel and the medium outflow channel. The valve internals include a valve seat. The valve seat is sealingly installed at the communication port. A medium through hole with a vertically extending axis is provided on the valve seat. A valve core for closing or opening the medium through hole is provided. The valve core is movably installed in the valve body in the vertical direction. The top surface of the valve core is integrally in a slope structure for gathering molten salt and gradually converges towards the axis of the valve core from top to bottom.

2. The molten salt control valve according to claim 1, wherein The valve internals further include a valve cage and a pressure cylinder, both of which are in a ring structure. The bottom end of the valve cage is coaxially abutted against the top end of the valve seat, and a diversion port communicating the medium through hole with the medium outflow channel is provided on its outer peripheral wall. The bottom end of the pressure cylinder is coaxially abutted against the top end of the valve cage. The top end of the pressure cylinder is butted against the bottom end surface of the valve cover. The top end surface of the pressure cylinder is in a slope structure and gradually converges towards the axis of the pressure cylinder from top to bottom.

3. The molten salt control valve according to claim 2, characterized in that, An annular notch is coaxially provided on the inner peripheral edge of the pressure cylinder. A first annular flange fitted in the annular notch is provided on the bottom surface of the valve cover. The bottom end surface of the annular notch is in a slope structure and gradually converges towards the axis of the pressure cylinder from top to bottom.

4. The molten salt control valve according to claim 3, characterized in that, A first support portion is coaxially surrounded on the outer peripheral side of the annular notch. A first pressing portion coaxially surrounded on the outer peripheral side of the first annular flange is provided on the bottom surface of the valve cover. The first support portion and the first pressing portion are abutted against each other, and a pressure cylinder gasket for sealing and in a ring structure is provided between the first support portion and the first pressing portion.

5. The molten salt control valve according to claim 4, characterized in that, A second pressing portion coaxially surrounded on the outer peripheral side of the first pressing portion is provided on the bottom surface of the valve cover. A second support portion surrounded on the outer peripheral side of the first support portion is provided on the valve body. The second support portion and the second pressing portion are abutted against each other, and a valve cover gasket for sealing and in a ring structure is provided between the second support portion and the second pressing portion.

6. The molten salt control valve according to claim 5, wherein, The first pressing portion and the second pressing portion are staggered in the vertical direction, and the second pressing portion is located above the first pressing portion.

7. The molten salt control valve according to claim 6, wherein Both the pressure cylinder gasket and the valve cover gasket are metal wound gaskets.

8. The molten salt control valve according to any one of claims 3 to 7, characterized in that A second annular flange for receiving the valve cage is provided on the outer peripheral edge of the valve seat. A first annular groove is provided on the valve body below the medium outflow channel. The second annular flange is fitted in the first annular groove, and a first C-shaped sealing ring is provided between the second annular flange and the first annular groove.

9. The molten salt control valve according to claim 8, wherein A third annular flange is coaxially provided on the inner peripheral edge of the top end of the valve cage. A second annular groove fitted with the third annular flange is coaxially provided on the inner peripheral edge of the bottom end of the pressure cylinder. A second C-shaped sealing ring is provided between the third annular flange and the second annular groove.

10. The molten salt control valve according to claim 9, wherein The valve core is provided with a valve rod for driving its movement. A valve cover through hole for the valve rod to extend upward is provided on the valve cover. A packing groove surrounding the valve rod is provided at the top position of the inner peripheral wall of the valve cover through hole. Packing is filled in the packing groove, and a packing gland assembly for compacting the packing is provided at the top of the packing groove.

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