Double-seat regulating valve for molten salt operating conditions

Abstract

The present invention relates to the technical field of valves, and particularly relates to a double-seat regulating valve for molten salt working conditions, which comprises a valve body, valve seats and a valve rod. The valve seats are arranged in the valve body and are divided into an upper valve seat and a lower valve seat which are distributed up and down. Each valve seat is respectively provided with a flow passage for the fluid in the valve body to flow through. In the present invention, by arranging an inflatable member on the valve seat and using a first inflatable body and a second inflatable body with interconnected internal gases, the internal gas balance of the inflatable member is achieved. When the valve rod moves, the squeezing block arranged on the valve rod will press the gas inside the second inflatable body into the first inflatable body, causing the first inflatable body to expand between the flow port and the valve core. It is not necessary for the valve core to directly contact the valve seat. By means of this intermediate medium, the damage to the main body caused by the direct contact of the valve core is avoided, which is beneficial to the service life and maintenance difficulty of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a double-valve-seat regulating valve for molten salt working conditions. Background Art

[0002] In various working conditions, regulating valves are often used to circulate or cut off fluids or gases, and they are an essential device in modern industry.

[0003] In the prior art, during the use of various regulating valves for circulating fluids or gases, a valve stem is often used to stretch and contract within the valve, and a valve core on the valve stem is used to block the valve seat to achieve the purpose of blocking the internal flow port of the valve body. However, this method of achieving sealing by squeezing the structural strength of the valve core itself requires a certain connection strength between the valve core and the valve seat to ensure a small gap between the two. After use, the reset of the valve stem also requires a certain traction force to separate the two. As the use time is prolonged, it causes great damage to the service life of the valve core and the valve seat.

[0004] Therefore, a double-valve-seat regulating valve for molten salt working conditions is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] Technical Problems to be Solved

[0006] In view of the above-mentioned drawbacks of the prior art, the present invention provides a double-valve-seat regulating valve for molten salt working conditions, which can effectively solve the problem that the sealing method in the prior art affects the service life of internal components of the valve.

[0007] Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions:

[0009] The present invention provides a double-valve-seat regulating valve for molten salt working conditions, including a valve body, valve seats, and a valve stem. The valve seats are arranged in the valve body and are divided into an upper valve seat and a lower valve seat which are distributed up and down. Each valve seat is respectively provided with a flow channel for the fluid in the valve body to flow through. The valve stem is movably installed in the valve body. Two valve cores are provided on the valve stem from top to bottom. The two valve cores are respectively arranged above the flow ports of the two valve seats and can be inserted into the flow ports to intercept the liquid.

[0010] Wherein, an inflatable member is respectively arranged at the flow port of each valve seat. When the adjacent valve core is inserted into the flow port, the inflatable member can expand and bulge, and be tightened between the flow port and the outer wall of the valve core, reducing the fluid flow space and preventing the fluid inside the valve body from flowing out from the flow port.

[0011] Furthermore, the inflatable member includes a first inflatable body and a second inflatable body. The gases inside the first inflatable body and the second inflatable body are in communication with each other and are both concentrically arranged with the valve core. The two inflatable bodies are vertically distributed in the upper and lower parts of the flow channel. When the second inflatable body contacts the valve core, the air inside it can be squeezed into the first inflatable body to cause the first inflatable body to expand.

[0012] Furthermore, the inflatable member further includes a squeezing block. The squeezing block is in the shape of a frustum of a cone with a wider upper part and a narrower lower part, and is installed at the lower part of the valve core. The squeezing block is concentrically distributed with the second inflatable body and can squeeze the second inflatable body as the valve stem moves.

[0013] Furthermore, the valve stem includes a rod body and a valve core. The rod body is rotatably installed in the valve body and can vertically expand and contract in the valve body;

[0014] The two valve cores are respectively movably installed on the upper and lower valve seats. The rod body is inserted into the two valve cores and is fixed to at least one of the valve cores, and expands and contracts in the valve body along with it.

[0015] Furthermore, an elastic member is provided between the valve core and the adjacent valve seat. The elastic member includes a fixed body and an elastic body. The fixed body is installed on the valve seat and in the flow channel. One end of the elastic body faces the lower end of the adjacent valve core.

[0016] Wherein, a plurality of cavities for the fluid in the flow channel to pass through are formed on the end face of the fixed body.

[0017] Furthermore, the valve core includes guiding strips. A plurality of guiding strips are provided and distributed at the outer end of the valve core, and extend downward along the outer edge direction starting from the upper end of the valve core. Guiding grooves for the guiding strips to slide into are formed on the fixed body.

[0018] Furthermore, the elastic body is detachably connected to the fixed body.

[0019] Furthermore, the rod body further includes an outer rod and an inner rod. The outer rod is rotatably installed inside the valve body and can be guided to move downward towards the adjacent valve seat. The inner rod is movably connected to the outer rod, and a spring is provided between the inner rod and the outer rod.

[0020] Advantageous Effects

[0021] The technical solution provided by the present invention has the following advantageous effects compared with the known public technologies:

[0022] In the present invention, an inflatable member is provided on the valve seat, and the first inflatable body and the second inflatable body with interconnected internal gases are utilized to achieve the internal gas balance of the inflatable member. When the valve stem moves, the squeezing block provided on the valve stem will press the gas inside the second inflatable body into the first inflatable body, causing the first inflatable body to expand between the flow port and the valve core. It is not necessary for the valve core to directly contact the valve seat. By means of this intermediate object, damage to the main body caused by direct contact of the valve core is avoided, which is beneficial to the service life and maintenance difficulty of the valve. Brief Description of the Drawings

[0023] 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 description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Schematic diagram of the exploded structure of the valve stem of the present invention;

[0025] Figure 2 Schematic diagram of the overall structure of the present invention;

[0026] Figure 3 Schematic front sectional view of the structure of the present invention;

[0027] Figure 4 Schematic side sectional view of the valve stem structure of the present invention;

[0028] Figure 5 Schematic diagram of the moving state of the lower valve seat of the present invention;

[0029] Figure 6 Schematic diagram of the moving state of the upper valve seat of the present invention;

[0030] Figure 7 Schematic diagram of the moving state of the valve seat of the present invention;

[0031] Figure 8 Schematic diagram of the exploded structure of the elastic member of the present invention.

[0032] The reference numerals in the drawings respectively represent: 1, valve body; 11, flow pipe orifice; 2, valve seat; 21, upper valve seat; 22, lower valve seat; 23, inflatable member; 231, first inflatable body; 232, second inflatable body; 233, squeezing block; 3, valve stem; 31, rod body; 311, outer rod; 312, inner rod; 313, spring; 4, valve core; 41, guiding strip; 42, limiting groove; 421, deep groove; 422, shallow groove; 43, plug; 5, elastic member; 51, fixed body; 511, cavity; 512, annular hole; 513, retaining sleeve; 52, elastic body. Detailed implementation mode

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Embodiment 1: A double-seat regulating valve for molten salt working conditions, comprising a valve body 1 with flow-through pipe orifices 11 provided at both ends, and a valve seat 2 and a valve stem 3 provided in the valve body 1. A middle cavity for fluid flow is provided inside the valve body 1. The valve seat 2 is divided into an upper valve seat 21 and a lower valve seat 22 which are distributed up and down. The middle cavity is divided into two independent and mutually communicable chambers by the two valve seats. The two flow-through pipe orifices 11 are respectively used as channels for fluid inlet and fluid outlet. When fluid enters from the flow-through pipe orifice 11 for fluid inlet, the flow-through pipe orifice 11 can be blocked and closed by the movement of the two valve seats, and the fluid has to flow out from the other flow-through pipe orifice 11.

[0036] Each valve seat is respectively provided with a flow channel for fluid flow inside the valve body 1. Each flow channel is circular. The upper valve seat 21 located in the upper part of the valve body 1 communicates with the lower valve seat 22 through the flow channel opened therein. The valve stem 3 passes through the two flow channels and can move up and down. The sealing structure (packing) located above the valve stem 3 is a well-known technology in the art, and is not shown in detail in this example and the accompanying drawings.

[0037] Two valve cores 4 are installed on the valve stem 3 from top to bottom. The valve core 4 is in the shape of a frustum of a cone with a wider top and a narrower bottom. The diameter of the lower end plane of the valve core 4 is smaller than the diameter of the flow channel, while the diameter of the upper end plane of the valve core 4 is larger than the diameter of the flow channel and cannot pass through the flow channel. When the valve core 4 is inserted into the flow orifice, the flow orifice will be blocked and the liquid will be intercepted as it continues to be inserted. The driving movement of the valve stem 3 is a well-known technology in the art, and will not be elaborated in this example.

[0038] Wherein, an inflation member 23 is respectively provided at the flow orifice of each valve seat. The inflation member 23 can expand and bulge when the adjacent valve core 4 is inserted into the flow orifice, and is tightened between the flow orifice and the outer wall of the valve core 4 to reduce the fluid space and prevent the fluid inside the valve body 1 from flowing through.

[0039] Specifically, the inflatable member 23 in this example includes a first inflatable body 231 and a second inflatable body 232. Both inflatable bodies are hollow inflatable rings. The internal gases of the two are made to communicate through a ventilation pipe. Each inflatable ring is concentrically arranged with the valve core 4. The two inflatable bodies are vertically distributed in the upper and lower parts of the flow channel. When the second inflatable body 232 contacts the valve core 4, the air inside it can be squeezed into the first inflatable body 231 to cause the first inflatable body 231 to expand. The diameter of the second inflatable body 232 is smaller than that of the first inflatable body 231.

[0040] A limiting cavity is provided inside the valve seat, and the two inflatable bodies in the inflatable member 23 are stuck in the limiting cavity. A number of protrusions communicating with the inflatable body are distributed on the inner ring surface of each inflatable body. When the outer end of the valve core 4 abuts against the protrusions, the protrusions will contract inward. A squeezing block 233 is provided below the second inflatable body 232. The squeezing block 233 is in the shape of a frustum with a wider top and a narrower bottom, and is installed below the valve core 4. The squeezing block 233 is concentrically distributed with the second inflatable body 232 and can squeeze the second inflatable body 232 as the valve stem 3 moves.

[0041] When the valve stem 3 starts to move, the outer end of the squeezing block 233 will abut against the protrusions on the inner ring surface of the second inflatable body 232, causing the outer surface area of the second inflatable body 232 to contract. The internal air enters the first inflatable body 231 from the ventilation pipe. Thus, the internal air of the first inflatable body 231 increases. At this time, the first inflatable body 231 will expand at the flow port and block the gap at the side edge of the flow port to prevent the liquid from flowing in from this place.

[0042] Embodiment 2:

[0043] The valve stem 3 in this example includes a rod body 31 and a valve core 4. The rod body 31 is rotatably installed in the valve body 1 and can vertically expand and contract in the valve body 1. The rotation and vertical guiding expansion and contraction of the rod body 31 are prior arts, and the specific structure is not shown in detail.

[0044] The two valve cores 4 in this example are respectively movably installed on the upper and lower valve seats. Two limiting grooves 42 are respectively opened at the upper ends of each valve core 4, including a deep groove 421 and a shallow groove 422 symmetrically distributed with the center of the valve core 4 as the center. Two pins 43 that can be inserted into the limiting grooves 42 are provided on the outer end surface of the valve stem 3. The two pins 43 are respectively provided at the upper parts of the two valve seats 2. The deep grooves 421 and the shallow grooves 422 on the two valve seats 2 are located on the same cross-section and are symmetrically distributed. The two pins 43 are distributed in the same direction. The depth of the deep groove 421 is at least twice that of the shallow groove 422.

[0045] When the upper latch 43 is directly above the deep groove 421, the lower latch 43 is directly above the shallow groove 422 on the lower valve seat 22. Thus, when the valve stem 3 moves downward, the upper latch 43 and the lower latch 43 will respectively insert into the two grooves. Since the depth of the deep groove 421 is greater than that of the shallow groove 422, the latch 43 inserted into the shallow groove 422 will drive the lower valve seat 22 to move downward and block. The upper valve seat remains stationary as it is not subject to a thrust force. Conversely, by rotating the valve stem 3, the latches 43 can be moved to another groove for cooperation respectively, enabling the two valve seats to be used separately and achieving the functional transformation from a multi-valve seat to a single-valve seat.

[0046] Refer to the appendix Figure 7 , when both latches 43 are not on the limiting groove 42, the two valve seats can be pushed to move simultaneously. And to prevent the valve stem 3 from shifting when moving, corresponding card slots with the same depth can be provided on the valve seat for the latches 43 to insert.

[0047] An elastic member 5 is provided between the valve core 4 and the adjacent valve seat. The elastic member 5 includes a fixed body 51 and an elastic body 52. The fixed body 51 is installed on the valve seat and in the flow channel. One end of the elastic body 52 faces the lower end of the adjacent valve core 4 and is detachably connected to the fixed body 51.

[0048] Among them, a plurality of cavities 511 for the fluid in the flow channel to pass through are provided on the end face of the fixed body 51.

[0049] Specifically, an annular fixed body 51 is installed in the upper part of the flow channel. A circular hole 512 is provided in the middle of the fixed body 51. A ferrule 513 is distributed along the outer edge direction of the circular hole 512 at the lower end of the fixed body 51. The elastic body 52 is in the shape of a thin film and is sleeved on the ferrule 513 for fixation. When the lower end of the valve core 4 abuts against the elastic body 52, it will be blocked. The elastic body 52 will expand and open downward and generate a certain elastic force. When the valve core 4 no longer applies a thrust force, the elastic body 52 will rebound to the initial position.

[0050] Four guiding strips 41 are circumferentially distributed on the outer end of the valve core 4. And each guiding strip 41 extends downward along the outer edge direction of the valve core 4 starting from the upper end of the valve core 4. Guiding grooves for the guiding strips 41 to slide into are provided on the fixed body 51. When the valve core 4 moves downward, by inserting the guiding strips 41 into the guiding grooves, a certain guiding effect is provided to avoid slipping or tilting.

[0051] The rod body 31 further includes an outer rod 311 and an inner rod 312. The outer rod 311 is rotatably installed inside the valve body 1 and can be guided to move downward in the direction of the adjacent valve seat. The inner rod 312 is movably connected to the outer rod 311, and a spring 313 is provided between the inner rod 312 and the outer rod 311.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-seat regulating valve for molten salt working conditions, characterized in that, Comprising: Valve body; Valve seat, the valve seat is arranged in the valve body and is divided into an upper valve seat and a lower valve seat which are distributed up and down. Each valve seat is respectively provided with a flow channel for the fluid in the valve body to flow through; Valve rod, the valve rod is movably installed in the valve body. Two valve cores are arranged on the valve rod from top to bottom. The two valve cores are respectively arranged above the flow ports of the two valve seats and can be inserted into the flow ports to intercept the liquid; Wherein, an inflatable member is respectively arranged at the flow port of each valve seat. The inflatable member can expand and bulge when the adjacent valve core is inserted into the flow port, and is tightened between the flow port and the outer wall of the valve core, reducing the fluid flow space and preventing the fluid inside the valve body from flowing out from the flow port; First inflatable body; Second inflatable body, the gases inside the first inflatable body and the second inflatable body are communicated with each other and are both concentrically arranged with the valve core. The two inflatable bodies are distributed in the upper and lower parts of the flow channel up and down. The second inflatable body can squeeze the air inside it into the first inflatable body when contacting the valve core to make the first inflatable body expand; The inflatable member further includes: Squeezing block, the squeezing block is in the shape of a frustum of a cone with a wider upper part and a narrower lower part, and is installed at the lower part of the valve core. The squeezing block is concentrically distributed with the second inflatable body and can squeeze the second inflatable body as the valve rod moves; An elastic member is arranged between the valve core and the adjacent valve seat. The elastic member includes: Fixed body, the fixed body is installed on the valve seat and is installed in the flow channel; Elastic body, one end of the elastic body faces the lower end of the adjacent valve core, Wherein, a plurality of cavities for the fluid in the flow channel to pass through are opened on the end face of the fixed body; The valve rod includes a rod body, and the rod body includes: Outer rod, the outer rod is rotatably installed inside the valve body and can be guided to move downward towards the adjacent valve seat; Inner rod, the inner rod is movably connected with the outer rod, and a spring is arranged between the inner rod and the outer rod.

2. The double-seat regulating valve for molten salt working conditions according to claim 1, wherein The rod body is rotatably installed in the valve body and can vertically expand and contract in the valve body; Valve cores, the two valve cores are respectively movably installed on the upper and lower valve seats. The rod body is inserted into the two valve cores and is fixed to at least any one of the valve cores and expands and contracts in the valve body along with it.

3. The double-seat regulating valve for molten salt working conditions according to claim 2, characterized in that, The valve core includes: Guide strips, a plurality of guide strips are arranged and distributed at the outer end of the valve core, and extend downward along the outer edge direction of the valve core starting from the upper end of the valve core. Guide grooves for the guide strips to slide into are opened on the fixed body.

4. The double-seat regulating valve for molten salt working conditions according to claim 3, characterized in that, The elastic body is detachably connected to the fixed body.

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