A valve seat sealing structure for an ultra-low temperature soft-sealed ball valve

Abstract

The invention discloses a valve seat sealing structure of an ultra-low temperature soft-sealed ball valve, and the invention relates to the technical field of ball valves. The valve seat sealing structure of the ultra-low temperature soft-sealed ball valve, through the setting of the sealing component, when the ball valve body is in an open or closed state, the outer sealing ring frame and the inner sealing ring frame can always fit with the outer surface to maintain the sealing effect, and when the ball valve body is closed, as the pressure on the inner sliding piece and the telescopic seal increases, the pressure on the inner sliding piece and the telescopic seal can be proportional to the pressure of the conveyed material, thereby improving the fit between the telescopic seal and the ball valve body, and further improving the sealing effect when the ball valve body is in a closed state.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a valve seat sealing structure of an ultra-low temperature soft sealing ball valve. Background Art

[0002] Ball valve, the ball of the opening and closing part is driven by the valve stem and rotates around the axis of the ball valve; it can also be used for the regulation and control of fluids. The hard-sealed V-type ball valve has a strong shear force between its V-type ball core and the metal valve seat welded with hard alloy, which is particularly suitable for media containing fibers, tiny solid particles, etc. The seal between the ball and the valve body is often achieved in the form of a sealing ring. Referring to the Chinese patent, the announcement number is "CN217874291U" "Sealing structure between the sealing ring and the valve seat of an ultra-low temperature ball valve", the patent points out that when the valve body is closed for a long time, the gas and liquid two-phase flow will form pulsating pressure, and leakage will occur; but because the valve body is in a closed state, the sealing structure between its material input end and the ball will be under greater pressure. When the internal pressure of the input pipeline is too high, it is easy to cause leakage in the sealing structure. In this regard, we propose a valve seat sealing structure of an ultra-low temperature soft-sealed ball valve to solve the above problem. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a valve seat sealing structure for an ultra-low temperature soft-sealed ball valve, which solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a valve seat sealing structure of an ultra-low temperature soft-sealed ball valve, comprising a valve seat body, a sealing body is installed on the outside of the valve seat body, a spherical cavity is provided between the valve seat body and the inside of the sealing body, and the ball valve body is rotatably connected inside the spherical cavity, and a driving valve stem is installed inside the valve seat body for driving the ball valve body to rotate to realize opening and closing operations;

[0005] The valve seat body and the sealing body are both provided with sealing components on one side close to the ball valve body, which are used to ensure the sealing between the ball valve body, the valve seat body and the sealing body. A through cavity is provided inside the ball valve body.

[0006] The sealing assembly includes an outer sealing ring frame, an inner sealing ring frame is provided on the inner side of the outer sealing ring frame, and a plurality of positioning screws are provided between the outer sealing ring frame and the inner sealing ring frame, an annular cavity is reserved between the outer sealing ring frame and the inner sealing ring frame, and an inner sliding piece is slidably connected inside the annular cavity, a telescopic seal is fixedly installed at one end of the inner sliding piece close to the ball valve body, a plurality of spring bodies are fixed between the inner sliding piece and the outer sealing ring frame and the inner sealing ring frame, a plurality of through holes are symmetrically opened inside the sealing body, and the plurality of through holes are interconnected with the annular cavity, and are used for allowing the conveyed material to enter the annular cavity through the through holes during the conveying operation to apply pressure to the inner sliding piece.

[0007] Preferably, two cleaning ring frames are fixedly installed inside the spherical cavity, and the two cleaning ring frames are respectively located on the upper and lower sides of the ball valve body, the outer sides of the two cleaning ring frames are respectively in contact with the valve seat body and the sealing body, and the inner sides of the two cleaning ring frames are in contact with the outer surface of the ball valve body, and a plurality of cleaning scrapers are fixed on the inner sides of the cleaning ring frames, and the cleaning scrapers are used to clean the ball valve body.

[0008] Preferably, the side of the cleaning scraper close to the ball valve body always keeps in contact with it.

[0009] Preferably, the plurality of cleaning scrapers are all installed at an angle.

[0010] Preferably, a plurality of fixing bolts for locking are provided between the valve seat body and the sealing member body, and a sealing sheet is installed between the valve seat body and the sealing member body.

[0011] Preferably, the top surface of the valve seat body is rotatably connected to a rotating part, the driving valve stem is fixedly installed inside the rotating part, the end of the driving valve stem away from the rotating part is connected to the ball valve body, a positioning seat is fixed above the valve seat body for limiting the rotating part, the rotating part is rotatably connected to the positioning seat, and a rotating arm is fixedly installed on the outside of the rotating part.

[0012] Preferably, a notch is provided on the top surface of the ball valve body, and one end of the driving valve stem close to the ball valve body is inserted into the notch to drive the ball valve body to rotate.

[0013] Preferably, the rotating member and the driving valve stem are located at the upper center of the ball valve body and always remain perpendicular thereto.

[0014] Preferably, a sealing ring is provided between the driving valve stem and the valve seat body, the sealing ring is fixed inside the valve seat body, and the driving valve stem passes through the sealing ring and is rotatably connected thereto.

[0015] Preferably, a locking assembly is provided between the rotating member and the positioning seat for locking the position of the rotating member, the locking assembly includes a locking frame and a fixing frame, the locking frame is fixedly connected to the rotating member, the fixing frame is fixed above the positioning seat, fixing rods are fixedly installed at both ends of the fixing frame, and inner sliding rods are slidably installed inside the fixing rods, supporting springs are fixed between the inner sliding rods and the corresponding fixing rods, an arc-shaped surface is provided at the end of the inner sliding rod, slots matching the inner sliding rods are provided at both ends of the locking frame, and pressure rods are slidably connected inside the slots, and a return spring is sleeved on the outer side of the pressure rod.

[0016] The present invention provides a valve seat sealing structure for an ultra-low temperature soft-sealed ball valve. Compared with the prior art, it has the following beneficial effects:

[0017] (1) The valve seat sealing structure of the ultra-low temperature soft-sealed ball valve, through the setting of the sealing component, when the ball valve body is in an open or closed state, the outer sealing ring frame and the inner sealing ring frame can always fit with the outer surface to maintain the sealing effect, and when the ball valve body is closed, as the pressure on the inner sliding plate and the telescopic seal increases, the pressure on the inner sliding plate and the telescopic seal can be proportional to the pressure of the conveyed material, thereby enhancing the fit between the telescopic seal and the ball valve body, and further improving the sealing effect when the ball valve body is in a closed state.

[0018] (2) The valve seat sealing structure of the ultra-low temperature soft-sealed ball valve can be adjusted by pressing the corresponding pressure rod when switching the state through the cooperation of the locking assembly. After the adjustment is completed, it can be automatically locked through the inner sliding rod, which can avoid the phenomenon of accidental touch causing the valve to open or close automatically, further improving the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the valve seat body and the sealing body of the present invention;

[0021] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0022] Figure 4 For the present invention Figure 2 Sectional front view structural diagram;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the cleaning ring frame of the present invention;

[0024] Figure 6 It is a schematic diagram of the cross-sectional structure of the outer sealing ring frame and the inner sealing ring frame of the present invention;

[0025] Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle;

[0026] Figure 8 This is a schematic diagram of the locking assembly structure of the present invention;

[0027] Fig. 9 It is a schematic cross-sectional structure diagram of the locking frame and the fixing frame of the present invention;

[0028] Fig.10 For the present invention Fig. 9 Enlarged structural diagram at point C in the middle.

[0029] In the figure: 1. valve seat body; 2. sealing body; 201. fixing bolt; 202. sealing sheet; 3. ball valve body; 301. through cavity; 302. notch; 4. rotating member; 401. rotating arm; 402. driving valve stem; 403. sealing collar; 5. positioning seat; 6. through hole; 7. outer sealing ring frame; 8. inner sealing ring frame; 9. positioning screw; 10. inner slide; 1001. telescopic seal; 1002. spring body; 11. cleaning ring frame; 1101. cleaning scraper; 12. locking frame; 1201. pressure rod; 1202. reset spring; 13. fixing frame; 14. fixing rod; 15. inner slide; 1501. arc surface; 16. support spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 10 The present invention provides two technical solutions, which specifically include the following embodiments:

[0032] Embodiment 1: In the embodiment of the present invention, reference Figure 1-Figure 5 , a valve seat sealing structure of an ultra-low temperature soft-sealed ball valve, comprising a valve seat body 1, a sealing body 2 is installed on the outside of the valve seat body 1, a spherical cavity is provided between the inside of the valve seat body 1 and the sealing body 2, and a ball valve body 3 is rotatably connected inside the spherical cavity, a driving valve stem 402 is installed inside the valve seat body 1, which is used to drive the ball valve body 3 to rotate to realize the opening and closing operation, the valve seat body 1 and the sealing body 2 form a valve seat structure, one side of the sealing body 2 is the material input end, and one side of the valve seat body 1 is the material output end, and the rotation angle of the moving ball valve body 3 is 90°, reference Figure 2 , the ball valve body 3 rotates to the closed position;

[0033] In the embodiment of the present invention, further, reference is made to Figure 1-Figure 10 The valve seat body 1 and the sealing body 2 are both provided with sealing components on one side close to the ball valve body 3, which are used to ensure the sealing between the ball valve body 3 and the valve seat body 1 and the sealing body 2. A through cavity 301 is provided inside the ball valve body 3, and the through cavity 301 is used for the circulation of substances. When the through cavity 301 rotates to be coaxial with the valve seat body 1 and the sealing body 2, it is in an open state, and when the through cavity 301 rotates to be coaxial with the valve seat body 1 and the sealing body 2 and is vertical, it is in a closed state;

[0034] In the embodiment of the present invention, further, the sealing assembly includes an outer sealing ring frame 7, an inner sealing ring frame 8 is provided on the inner side of the outer sealing ring frame 7, and a plurality of positioning screws 9 are provided between the outer sealing ring frame 7 and the inner sealing ring frame 8, an annular cavity is reserved between the outer sealing ring frame 7 and the inner sealing ring frame 8, and an inner sliding piece 10 is slidably connected inside the annular cavity, a telescopic sealing member 1001 is fixedly installed on one end of the inner sliding piece 10 close to the ball valve body 3, a plurality of spring bodies 1002 are fixed between the inner sliding piece 10 and the outer sealing ring frame 7 and the inner sealing ring frame 8, a plurality of through holes 6 are symmetrically provided inside the sealing body 2, and the plurality of through holes 6 are interconnected with the annular cavity, and are used to pass the conveyed material through the through holes 6 into the annular cavity during the conveying operation, and to apply pressure to the inner sliding piece 10, and during the operation, as the valve stem 402 is driven to rotate, the spherical cavity formed by the ball valve body 3 in the valve seat body 1 and the sealing body 2 can be driven to rotate to realize the opening and closing operation, and the outer sealing ring frame 7 and the inner sealing ring frame 8 can The inner slide 10 can always keep in contact with the outer surface of the ball valve body 3 to ensure the sealing effect. The inner slide 10 can drive the telescopic seal 1001 to always keep in contact with the outer surface of the ball valve body 3 through the cooperation of the spring body 1002, further improving the sealing effect. When the ball valve body 3 is opened or closed, as the material enters the annular cavity through the through hole 6, the inner slide 10 can be pressurized, thereby applying pressure to the telescopic seal 1001, which can increase the contact strength between the telescopic seal 1001 and the surface of the ball valve body 3, further avoiding leakage of the material. When the ball valve body 3 is closed, as the ball valve body 3 blocks the material, the pressure on the inner slide 10 and the telescopic seal 1001 can be increased, and the pressure on the inner slide 10 and the telescopic seal 1001 can be proportional to the pressure of the conveying material, thereby effectively improving the sealing effect of the telescopic seal 1001 and the ball valve body 3, and will not affect the opening or closing of the ball valve body 3.

[0035] In the embodiment of the present invention, further, two cleaning ring frames 11 are fixedly installed inside the spherical cavity, and the two cleaning ring frames 11 are respectively located on the upper and lower sides of the ball valve body 3, and the outer sides of the two cleaning ring frames 11 are respectively in contact with the valve seat body 1 and the sealing body 2, and the inner sides of the two cleaning ring frames 11 are in contact with the outer surface of the ball valve body 3. A plurality of cleaning scrapers 1101 are fixed on the inner side of the cleaning ring frame 11, and the cleaning scrapers 1101 are used to clean the ball valve body 3. The cleaning ring frame 11 is used to clean the open position and the closed position of the ball valve body 3. The open position refers to the position where the ball valve body 3 contacts the outer sealing ring frame 7, the inner sealing ring frame 8 and the telescopic seal 1001 when the ball valve body 3 is in the open state. Similarly, the closed position refers to the position where the ball valve body 3 contacts the outer sealing ring frame 7, the inner sealing ring frame 8 and the telescopic seal 1001 when the ball valve body 3 is in the closed state.

[0036] In the embodiment of the present invention, specifically, when the ball valve body 3 is converted from a closed state to an open state, the closed position can be separated from the sealing assembly as the ball valve body 3 rotates, and the open position located inside the cleaning ring frame 11 can move to the inside of the sealing assembly as the ball valve body 3 rotates. During the movement, the open position contacts the cleaning scraper 1101, thereby scraping off surface impurities and ensuring the sealing effect.

[0037] In the embodiment of the present invention, specifically, the cleaning scraper 1101 is always in contact with the ball valve body 3 on one side thereof;

[0038] In the embodiment of the present invention, specifically, the plurality of cleaning blades 1101 are all installed in an inclined manner, and the cleaning effect can be further ensured by the inclined installation of the cleaning blades 1101;

[0039] In the embodiment of the present invention, specifically, a plurality of fixing bolts 201 for locking are provided between the valve seat body 1 and the sealing body 2, and a sealing sheet 202 is installed between the valve seat body 1 and the sealing body 2; the valve seat body 1 and the sealing body 2 are detachable, and the sealing assembly therein and the ball valve body 3 are also detachable, which is convenient for disassembly and maintenance. The ball valve body 3 and the driving valve stem 402 are connected by bolts, which is convenient for disassembly, and the sealing assembly is press-fit installation. The installation method is to first install the sealing assembly close to the valve seat body 1 into a preset position, and then press the ball valve body 3 into the valve seat body 1, and fix the ball valve body 3 and the driving valve stem 402 with bolts, and then install the sealing assembly close to the sealing body 2 into the sealing body 2, until the valve seat body 1 and the sealing body 2 are combined and locked by the fixing bolt 201, and the assembly operation can be completed, which effectively improves the convenience of disassembly and assembly of the equipment;

[0040] In the embodiment of the present invention, further, the top surface of the valve seat body 1 is rotatably connected with a rotating member 4, the driving valve stem 402 is fixedly installed inside the rotating member 4, and the end of the driving valve stem 402 away from the rotating member 4 is connected to the ball valve body 3, and a positioning seat 5 is fixed above the valve seat body 1 for limiting the rotating member 4, and the rotating member 4 is rotatably connected to the positioning seat 5, and a rotating arm 401 is fixedly installed on the outer side of the rotating member 4, and by rotating the rotating arm 401, the rotating member 4 can be driven to rotate, so that the driving valve stem 402 can rotate with the rotating member 4, thereby driving the ball valve body 3 to rotate, and realizing the opening and closing operation;

[0041] In the embodiment of the present invention, specifically, a notch 302 is provided on the top surface of the ball valve body 3, and one end of the driving valve stem 402 close to the ball valve body 3 is inserted into the notch 302 to drive the ball valve body 3 to rotate;

[0042] In the embodiment of the present invention, specifically, the rotating member 4 and the driving valve stem 402 are located at the upper center of the ball valve body 3 and are always kept perpendicular thereto;

[0043] In the embodiment of the present invention, specifically, a sealing ring 403 is provided between the driving valve stem 402 and the valve seat body 1 , the sealing ring 403 is fixed inside the valve seat body 1 , and the driving valve stem 402 passes through the sealing ring 403 and is rotatably connected thereto.

[0044] Embodiment 2: Based on Embodiment 1, on the basis of Embodiment 1, in the embodiment of the present invention, further, reference is made to Figure 8-Figure 10 A locking assembly is provided between the rotating member 4 and the positioning seat 5, which is used to lock the position of the rotating member 4. The locking assembly includes a locking frame 12 and a fixing frame 13. The locking frame 12 is fixedly connected to the rotating member 4, and the fixing frame 13 is fixed above the positioning seat 5. Fixed rods 14 are fixedly installed at both ends of the fixing frame 13, and inner slide rods 15 are slidably installed inside the fixed rods 14. Support springs 16 are fixed between the inner slide rods 15 and the corresponding fixed rods 14. An arc surface 1501 is provided at the end of the inner slide rod 15. Slots adapted to the inner slide rod 15 are provided at both ends of the locking frame 12, and pressure rods 1201 are slidably connected inside the slots. A return spring 1202 is sleeved on the outer side of the pressure rod 1201. Figure 8 The state of the middle rotating arm 401 is the locked state. When the rotating arm 401 needs to be rotated, the corresponding pressure rod 1201 needs to be pressed downwards, and the inner sliding rod 15 is pressed into the interior of the fixed rod 14 through the pressure rod 1201, so that the inner sliding rod 15 is separated from the slot. At this time, rotating the rotating arm 401 can drive the rotating part 4 and the locking frame 12 to rotate, until the inner sliding rod 15 on the other side is pushed out by the supporting spring 16 and inserted into the corresponding slot, completing the locking process. Through the opening of the arc surface 1501, the locking frame 12 can drive the inner sliding rod 15 to automatically slide down during the rotation of the rotating part 4, so that the inner sliding rod 15 can be automatically inserted into the slot. Through this locking method, the phenomenon of accidental touch causing the valve to open or close automatically can be avoided, thereby ensuring the safety of operation.

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A valve seat sealing structure for an ultra-low temperature soft-sealed ball valve, comprising a valve seat body (1), a sealing member body (2) being mounted outside the valve seat body (1), and characterized in that: A spherical cavity is provided between the valve seat body (1) and the sealing element body (2), and a ball valve body (3) is rotatably connected to the inside of the spherical cavity. A driving valve stem (402) is installed inside the valve seat body (1) for driving the ball valve body (3) to rotate and realize an opening and closing operation. A sealing assembly is provided on one side of the valve seat body (1) and the sealing body (2) close to the ball valve body (3) to ensure the sealing between the ball valve body (3) and the valve seat body (1) and the sealing body (2); a through cavity (301) is provided inside the ball valve body (3); The sealing assembly comprises an outer sealing ring frame (7), an inner sealing ring frame (8) is provided on the inner side of the outer sealing ring frame (7), and a plurality of positioning screws (9) are provided between the outer sealing ring frame (7) and the inner sealing ring frame (8), an annular cavity is reserved between the outer sealing ring frame (7) and the inner sealing ring frame (8), and an inner sliding plate (10) is slidably connected inside the annular cavity, a telescopic sealing member (1001) is fixedly installed on one end of the inner sliding plate (10) close to the ball valve body (3), a plurality of spring bodies (1002) are fixed between the inner sliding plate (10) and the outer sealing ring frame (7) and the inner sealing ring frame (8), a plurality of through holes (6) are symmetrically provided inside the sealing member body (2), and the plurality of through holes (6) are mutually connected with the annular cavity, and are used for applying pressure to the inner sliding plate (10) when a conveying operation is performed, when a conveying material enters the annular cavity through the through holes (6); The top surface of the valve seat body (1) is rotatably connected to a rotating member (4); the driving valve stem (402) is fixedly mounted inside the rotating member (4); the end of the driving valve stem (402) away from the rotating member (4) is connected to the ball valve body (3); a positioning seat (5) is fixed above the valve seat body (1) for limiting the position of the rotating member (4); the rotating member (4) is rotatably connected to the positioning seat (5); and a rotating arm (401) is fixedly mounted on the outer side of the rotating member (4); A sealing collar (403) is provided between the driving valve stem (402) and the valve seat body (1); the sealing collar (403) is fixed inside the valve seat body (1); the driving valve stem (402) passes through the sealing collar (403) and is rotatably connected thereto; A locking assembly is provided between the rotating member (4) and the positioning seat (5) for locking the position of the rotating member (4). The locking assembly comprises a locking frame (12) and a fixing frame (13). The locking frame (12) is fixedly connected to the rotating member (4). The fixing frame (13) is fixedly connected to the upper side of the positioning seat (5). Both ends of the fixing frame (13) are fixedly mounted with fixing rods (14), and inner sliding rods (15) are slidably mounted inside the fixing rods (14). A supporting spring (16) is fixed between the inner sliding rods (15) and the corresponding fixing rods (14). An arc surface (1501) is provided at the end of the inner sliding rod (15). Both ends of the locking frame (12) are provided with slots adapted to the inner sliding rods (15), and pressure rods (1201) are slidably connected inside the slots. A return spring (1202) is sleeved on the outer side of the pressure rod (1201).

2. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 1, characterized in that: Two cleaning ring frames (11) are fixedly installed inside the spherical cavity. The two cleaning ring frames (11) are respectively located on the upper and lower sides of the ball valve body (3). The outer sides of the two cleaning ring frames (11) are respectively in contact with the valve seat body (1) and the sealing body (2). The inner sides of the two cleaning ring frames (11) are in contact with the outer surface of the ball valve body (3). A plurality of cleaning scrapers (1101) are fixed inside the cleaning ring frames (11). The cleaning scrapers (1101) are used to clean the ball valve body (3).

3. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 2, characterized in that: The side of the cleaning scraper (1101) close to the ball valve body (3) always remains in contact with it.

4. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 2, characterized in that: The plurality of cleaning scrapers (1101) are all installed in an inclined manner.

5. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 1, characterized in that: A plurality of fixing bolts (201) for locking are arranged between the valve seat body (1) and the sealing body (2), and a sealing sheet (202) is installed between the valve seat body (1) and the sealing body (2).

6. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 1, characterized in that: The top surface of the ball valve body (3) is provided with a notch (302), and one end of the driving valve stem (402) close to the ball valve body (3) is inserted into the notch (302) to drive the ball valve body (3) to rotate.

7. The valve seat sealing structure of a cryogenic soft-sealed ball valve according to claim 1, characterized in that: The rotating member (4) and the driving valve stem (402) are located at the center of the upper part of the ball valve body (3) and always remain perpendicular thereto.

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