A double seal valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seal

Abstract

closure, and the like. The closure of the valve body is controlled by a valve core, and the closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core. The closure of the valve body is controlled by a valve core.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline valves, and in particular to a double-sealed valve for high-pressure and high-temperature fluid pipelines based on double sealing of balls and columns embedded in each other. Background Art

[0002] The existing valves used for pipelines conveying high-temperature and high-pressure media include a valve body, with a medium pipeline inlet and a medium pipeline outlet respectively opened on both sides of the valve body; the end of the medium pipeline inlet located inside the valve body and the end of the medium pipeline outlet located inside the valve body are the inlet end and the outlet end respectively; the inlet end and the outlet end are connected to a cavity opened in the vertical direction of the center of the valve body; in order to achieve the connection and cutoff of the medium pipeline inlet and the medium pipeline outlet, the current valve is a primary seal, that is, it relies on a valve core to close or cut off the flow channel between the medium pipeline inlet and the medium pipeline outlet; for high-temperature and high-pressure medium pipelines, this valve needs to achieve a reliable closing and cutting process by increasing process precision, material quality and sealing material grade, and its cost is very high, and the reliability is also low.

[0003] To this end, technicians in the relevant technical field have made improvements. For example, the Chinese patent application number CN201510658775.2 proposed a "valve for high-temperature and high-pressure pipelines". In practical applications, the following points are summarized for improvement:

[0004] 1. The device adopts a double sealing structure combining a plane seal and a cone seal, in which the outer wall of the second valve core that acts as a water surface seal and the second valve seat are fixedly sealed in line contact. As the number of uses increases, the contact between the outer wall of the second valve core and the second valve seat is prone to wear, thereby affecting its sealing performance;

[0005] 2. Since the device adopts a double valve stem structure, and the first valve core and the second valve core need to be arranged axially in parallel in structure, the overall height of the valve is relatively large, resulting in a large space occupied during packaging and transportation of the device, which is not convenient for installation and use in a small and limited space.

[0006] Based on this, the present invention designs a double-sealed valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seals to solve the above problems. Summary of the invention

[0007] The purpose of the invention is to provide a double-seal valve for high-pressure and high-temperature fluid pipelines based on double seals of ball-column embedding, so as to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, the invention provides the following technical solutions: a double-sealed valve for high-pressure, high-temperature and other fluid pipelines based on ball-column embedded double seals, comprising a valve body, wherein the left and right sides of the valve body are respectively provided with a medium inlet and a medium outlet connected to its inner cavity, a valve core sleeve is provided at the top of the inner cavity of the valve body, the inner cavity of the valve core sleeve is connected with the medium outlet, the inner cavity of the valve core sleeve is provided with a valve stem, the top of the valve stem is provided with a turntable handle, a valve core seat is provided at the bottom of the inner cavity of the valve body, the inner hole of the valve core seat is connected with the medium inlet, a column valve core is abutted on the top of the valve core seat, the inner cavity of the column valve core is provided with a ball valve core abutting with the upper end of the inner hole of the valve core seat, and the top of the column valve core is connected to the bottom of the valve stem.

[0009] Preferably, an annular groove is opened at the bottom end of the outer wall of the valve stem, a split ring is arranged in the annular groove, a valve stem pressing sleeve is threadedly connected to the upper end of the inner cavity wall of the column valve core, and the valve stem is connected to the column valve core by abutting the valve stem pressing sleeve with the split ring.

[0010] Preferably, the inner cavity of the column valve core is located between the bottom end of the valve stem and the ball valve core, and is provided with a valve core compression sleeve, a disc spring and a ball valve core upper pressure seat from top to bottom. The bottom end of the inner cavity of the column valve core is provided with a closing structure, and the diameter of the closing structure is smaller than the diameter of the ball valve core.

[0011] Preferably, the lower end surface of the column valve core and the upper end surface of the valve core seat are both ground and smooth sealing surfaces.

[0012] Preferably, the top outer wall of the valve core sleeve is sleeved with a valve stem sleeve, the lower end of the outer wall of the valve stem sleeve is screwed with a lower pressure plate, the top center of the valve core sleeve is sleeved with a packing gland and a sealing gasket, the top of the packing gland is provided with an upper pressure plate, the lower pressure plate and the valve body, as well as the upper pressure plate and the valve body are locked and connected by bolt fasteners.

[0013] Preferably, an internally threaded sleeve is threaded on the upper end of the valve stem, the top end of the internally threaded sleeve is connected to the turntable handle, the outer wall of the internally threaded sleeve is rotatably mounted with the inner cavity of the valve stem sleeve through two sets of plane bearings, and the top end of the valve stem sleeve is provided with a sleeve end cover for pressing and fixing the plane bearing.

[0014] Preferably, a stop block is provided in the middle of the inner cavity of the valve stem sleeve, and the inner and outer rings of the stop block are matched with the valve stem and the valve stem sleeve respectively.

[0015] Preferably, a lubrication nozzle is provided on the outer wall of the valve stem sleeve, and the inner side of the lubrication nozzle is connected to the plane bearing installation cavity.

[0016] Compared with the prior art, the invention has the following beneficial effects:

[0017] 1. The present invention adopts a double sealing structure combining a plane seal and a spherical seal. The valve stem is driven by a rotary handle to drive the column valve core to be pressed down, so that the lower end surface of the column valve core is fully fitted with the top surface of the valve core seat, and the lower end surface of the column valve core and the upper end surface of the valve core seat are both ground and smooth sealing surfaces. After the two are fitted together, they play a primary sealing role; the lower end of the inner cavity of the column valve core is provided with a ball valve core that can abut against the upper end edge of the inner hole of the valve core seat. After the column valve core is pressed down, the ball valve core blocks the upper end edge of the inner hole of the valve core seat. A disc spring structure is provided above the ball valve core, which can be used as a downward pressure energy storage device to ensure that the ball valve core and the upper end edge of the inner hole of the valve core seat are fully abutted, thereby playing a secondary sealing role;

[0018] 2. The ball valve core of the present invention is in an independent state without a connection structure in the inner cavity of the column valve core. When the valve is open, the ball valve core is out of contact with the upper edge of the inner hole of the valve core seat, and the function of squeezing and restricting rotation is lost. When the medium fluid flows through the inner cavity of the valve body, it will pass over the bottom surface of the ball valve core, thereby driving the ball valve core to rotate randomly. Therefore, each time the ball valve core is pressed down, the contact point with the upper edge of the inner hole of the valve core seat is dynamically changing, which can effectively alleviate the irreparable wear of the fixed contact area of ​​the valve core structure due to the cumulative increase in the number of valve switching uses, which is beneficial to prolonging the service life of the valve. life, improving the durability and sealing of the valve; third, the ball valve core of the present invention is arranged in the inner cavity of the column valve core, and the primary sealing structure formed by the mutual contact of the lower end face of the column valve core and the upper end face of the valve core seat, and the secondary sealing structure formed by the full abutment of the upper end of the inner hole of the ball valve core and the valve core seat are all in the same radial plane. Therefore, under the premise of improving the sealing performance and service life, the overall height of the valve can be reduced and the structure is more compact, which can not only reduce the space occupied by packaging and transportation, but also make it easier to install and use the device in a small and limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall internal structure of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of part A in FIG.

[0022] Figure 3 This is a schematic diagram of the column valve core structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the valve core seat structure of the present invention.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1-valve body, 2-medium inlet, 3-medium outlet, 4-valve core sleeve, 5-valve stem, 6-turntable handle, 7-valve core seat, 8-column valve core, 9-ball valve core, 10-split ring, 11-valve stem pressure sleeve, 12-valve core pressure sleeve, 13-disc spring, 14-ball valve core upper pressure seat, 15-ground smooth sealing surface, 16-valve stem sleeve, 17-lower pressure plate, 18-packing gland, 19-sealing gasket, 20-upper pressure plate, 21-bolt fasteners, 22-internal threaded sleeve, 23-plane bearing, 24-sleeve end cover, 25-stop block, 26-lubricating grease nozzle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0027] See also Figure 1-4 The invention provides a technical solution: a double-sealed valve for high-pressure, high-temperature and other fluid pipelines based on ball-column embedded double seals, comprising a valve body 1, a medium inlet 2 and a medium outlet 3 connected to its inner cavity are respectively arranged on the left and right sides of the valve body 1, a valve core sleeve 4 is arranged at the top of the inner cavity of the valve body 1, the inner cavity 4 of the valve core sleeve is connected with the medium outlet 3, the inner cavity of the valve core sleeve 4 is arranged with a valve stem 5, the top of the valve stem 5 is arranged with a turntable handle 6, a valve core seat 7 is arranged at the bottom of the inner cavity of the valve body 1, the inner hole of the valve core seat 7 is connected with the medium inlet 2, a column valve core 8 is abutted on the top of the valve core seat 7, the inner cavity of the column valve core 8 is provided with a ball valve core 9 abutting against the upper end of the inner hole of the valve core seat 7, and the top of the column valve core 8 is connected to the bottom of the valve stem 5.

[0028] Furthermore, an annular groove is opened at the bottom end of the outer wall of the valve stem 5, and a split ring 10 is arranged in the annular groove. A valve stem pressing sleeve 11 is screwed on the upper end of the inner cavity wall of the column valve core 8. The valve stem 5 is connected to the column valve core 8 by the valve stem pressing sleeve 11 abutting against the split ring 10.

[0029] Furthermore, the inner cavity of the column valve core 8 is located between the bottom end of the valve stem 5 and the ball valve core 9, and is provided with a valve core compression sleeve 12, a disc spring 13 and a ball valve core upper pressure seat 14 in sequence from top to bottom. The bottom end of the inner cavity of the column valve core 8 is a closing structure, and the diameter of the closing structure is smaller than the diameter of the ball valve core 9. Since the disc spring 13 has a very good load-bearing capacity, it is very reliable to use in a high-temperature and high-pressure transportation environment, and the disc spring 13 can be used as a downward pressure energy storage device, which can provide a downward pressure pre-tightening force when the valve is closed to ensure that the ball valve core 9 is fully abutted against the upper end of the inner hole of the valve core seat 7.

[0030] Furthermore, the lower end surface of the column valve core 8 and the upper end surface of the valve core seat 7 are both ground and smooth sealing surfaces 15, which play a primary sealing role after being attached to each other.

[0031] Furthermore, a valve stem sleeve 16 is sleeved on the top outer wall of the valve core sleeve 4, and a lower pressure plate 17 is screwed on the lower end of the outer wall of the valve stem sleeve 16. A packing gland 18 and a sealing gasket 19 are sleeved on the top center of the valve core sleeve 4. An upper pressure plate 20 is provided on the top of the packing gland 18. The lower pressure plate 17 and the valve body 1, as well as the upper pressure plate 20 and the valve body 1, are locked and connected by bolt fasteners 21 to ensure that the valve stem 5 and the valve core sleeve 4 are kept sealed.

[0032] Furthermore, an internally threaded sleeve 22 is threadedly connected to the upper end of the valve stem 5, the top end of the internally threaded sleeve 22 is connected to the turntable handle 6, the outer wall of the internally threaded sleeve 22 is rotatably mounted with the inner cavity of the valve stem sleeve 16 through two sets of plane bearings 23, and the top end of the valve stem sleeve 16 is provided with a sleeve end cover 24 for pressing and fixing the plane bearing 23.

[0033] Furthermore, a stop block 25 is provided in the middle of the inner cavity of the valve stem sleeve 16, and the inner and outer circles of the stop block 25 respectively cooperate with the valve stem 5 and the valve stem sleeve 16. When the rotating turntable handle 6 drives the internal threaded sleeve 22 to rotate, the valve stem 5 rises or falls relative to the internal threaded sleeve 22.

[0034] Furthermore, a lubricating nozzle 26 is provided on the outer wall of the valve stem sleeve 16 , and the inner side of the lubricating nozzle 265 is connected to the mounting cavity of the plane bearing 23 for injecting grease into the mounting cavity of the plane bearing 23 to facilitate the maintenance of the plane bearing 23 .

[0035] A specific application of this embodiment is:

[0036] When closing the valve, manually rotate the turntable handle 6 in the forward direction, and the turntable handle 6 rotates together with the internal threaded sleeve 22. Since the internal threaded sleeve 22 is threadedly matched with the valve stem 5, and a stop block 25 is provided between the valve stem 5 and the valve stem sleeve 16, when the turntable handle 6 rotates in the forward direction, the valve stem 5 moves downward accordingly, and the structures such as the column valve core 8 and the ball valve core 9 connected to the bottom end of the valve stem 5 descend accordingly, so that the lower end surface of the column valve core 8 is fully fitted with the upper end surface of the valve core seat 7 to form a primary seal, and the bottom of the ball valve core 9 is in contact with the upper end edge of the inner hole of the valve core seat 7. The disc spring 13 located in the inner cavity of the column valve core 8 can be used as a downward pressure energy storage device to ensure that the ball valve core 9 is fully in contact with the upper end edge of the inner hole of the valve core seat 7 to form a secondary seal, that is, the medium flow channel between the medium inlet 2 and the medium outlet 3 is completely blocked.

[0037] When opening the valve, manually rotate the turntable handle 6 in the opposite direction, and the turntable handle 6 rotates together with the medium inlet 22. Since the medium inlet 22 and the valve stem 5 are threadedly matched, and a stop block 25 is provided between the valve stem 5 and the valve stem sleeve 16, when the turntable handle 6 is reversed, the valve stem 5 rises and moves accordingly, and the structures such as the column valve core 8 and the ball valve core 9 connected to the bottom end of the valve stem 5 rise accordingly, and a gap channel is left between the outer wall of the column valve core 8 and the inner cavity wall of the valve core sleeve 4, so that the lower end face of the column valve core 8 is separated from the upper end face of the valve core seat 7, and the bottom of the ball valve core 9 is separated from the upper end edge of the inner hole of the valve core seat 7, that is, a channel through which the medium can flow is formed between the medium inlet 2 and the medium outlet 3.

[0038] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0039] In the invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0040] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double-sealed valve for a high-pressure, high-temperature fluid pipeline based on a ball-column embedded double seal, comprising a valve body (1), wherein the left and right sides of the valve body (1) are respectively provided with a medium inlet (2) and a medium outlet (3) connected to the inner cavity thereof, a valve core sleeve (4) is provided at the top of the inner cavity of the valve body (1), the inner cavity (4) of the valve core sleeve is connected to the medium outlet (3), the inner cavity of the valve core sleeve (4) is provided with a valve stem (5), and the top of the valve stem (5) is provided with a rotary handle (6), characterized in that: A valve core seat (7) is provided at the bottom of the inner cavity of the valve body (1), the inner hole of the valve core seat (7) is communicated with the medium inlet (2), a column valve core (8) is provided at the top of the valve core seat (7), a ball valve core (9) is provided in the inner cavity of the column valve core (8) and is abutted against the upper end of the inner hole of the valve core seat (7), and the top of the column valve core (8) is connected to the bottom end of the valve stem (5); an annular groove is provided at the bottom end of the outer wall of the valve stem (5), a split ring (10) is provided in the annular groove, and a valve stem sleeve (10) is screwed to the upper end of the inner cavity wall of the column valve core (8) 11), the valve stem (5) is connected to the column valve core (8) by abutting the valve stem sleeve (11) with the split ring (10); the inner cavity of the column valve core (8) and located between the bottom end of the valve stem (5) and the ball valve core (9) are provided with a valve core sleeve (12), a disc spring (13) and a ball valve core upper pressure seat (14) from top to bottom, and the bottom end of the inner cavity of the column valve core (8) is provided with a closing structure, and the diameter of the closing structure is smaller than the diameter of the ball valve core (9); the lower end surface of the column valve core (8) and the upper end surface of the valve core seat (7) are both ground smooth sealing surfaces (15).

2. According to claim 1, a double-seal valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seals is characterized by: The top outer wall of the valve core sleeve (4) is sleeved with a valve stem sleeve (16), and the lower end of the outer wall of the valve stem sleeve (16) is screwed with a lower pressure plate (17). The top center of the valve core sleeve (4) is sleeved with a packing gland (18) and a sealing gasket (19), and the top of the packing gland (18) is provided with an upper pressure plate (20). The lower pressure plate (17) and the valve body (1), as well as the upper pressure plate (20) and the valve body (1), are locked and connected by bolt fasteners (21).

3. A double-seal valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seals according to claim 2, characterized in that: The upper end of the valve stem (5) is threaded with an internal threaded sleeve (22), the top end of the internal threaded sleeve (22) is connected to the turntable handle (6), the outer wall of the internal threaded sleeve (22) is rotatably mounted with the inner cavity of the valve stem sleeve (16) through two sets of plane bearings (23), and the top end of the valve stem sleeve (16) is provided with a sleeve end cover (24) for pressing and fixing the plane bearing (23).

4. According to claim 3, a double-seal valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seals is characterized by: A stop block (25) is provided in the middle of the inner cavity of the valve stem sleeve (16), and the inner and outer rings of the stop block (25) are matched with the valve stem (5) and the valve stem sleeve (16) respectively.

5. According to claim 4, a double-seal valve for high-pressure and high-temperature fluid pipelines based on ball-column embedded double seals is characterized by: The outer wall of the valve stem sleeve (16) is provided with a lubricating oil injection nozzle (265), and the inner side of the lubricating oil injection nozzle (265) is connected to the installation cavity of the plane bearing (23).

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