A double-seal wedge-shaped double-disc gate valve

Abstract

The present invention discloses a double-sealed wedge-shaped double-disc gate valve in the technical field of engineering gate valves, comprising a gate valve body and a transmission support frame installed on the upper part of the gate valve body, a magnetic actuator installed on the transmission support frame, a fluid cavity is provided inside the gate valve body, a lower driving end of the magnetic actuator extends into the inner cavity of the gate valve body, an interval space between the fluid cavity and the inner cavity of the gate valve body is an operating cavity, a linkage assembly connected to the magnetic actuator is arranged in the operating cavity, the present invention blocks two fluid channels by arranging double gate plates in the fluid cavity, when one of the gate plates fails in sealing, the other can still complete the sealing function, thereby avoiding the situation of sealing failure; by arranging an equilateral quadrilateral mechanism of the linkage assembly to cooperate with the parallel assembly, the synchronous movement of the two gate plates can be completed, thereby ensuring the synchronization of the sealing action.

Description

Technical Field

[0001] The invention relates to the technical field of engineering gate valves, in particular to a double-sealed wedge-shaped double-disc gate valve. Background Art

[0002] The main technical features of the stop valve used in the supercritical CO2 dyeing industry are: ① The main sealing pair between the valve disc and the valve seat adopts a copper cone sealing pair to prevent internal leakage; ② The upper seal between the valve stem and the valve cover is a packing dynamic sealing structure to prevent the gate valve from leaking out; ③ A sealing gasket is installed between the valve body and the valve cover to form a static sealing structure to prevent the gate valve from leaking out.

[0003] The main problems of the existing stop valves used in this category are: ① The sealing ability of the internal packing dynamic seal structure is limited, and under high temperature and high pressure conditions, it is easy to cause leakage of the gate valve; ② The single sealing method usually adopted is often prone to sealing failure after a long time of use; ③ Under high temperature conditions, the valve disc and the valve seat are prone to bite, which in turn causes the stop valve to be unable to open; Based on this, the present invention designs a double-sealed wedge-shaped double-disc gate valve to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a double-sealed wedge-shaped double-disc gate valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-sealed wedge-shaped double-disc gate valve, comprising a gate valve body and a transmission support frame installed on the upper part of the gate valve body, a magnetic actuator is installed on the transmission support frame, a fluid cavity is provided inside the gate valve body, the lower driving end of the magnetic actuator extends into the inner cavity of the gate valve body, the interval space between the fluid cavity and the inner cavity of the gate valve body is an operating cavity, a linkage component connected to the magnetic actuator is arranged in the operating cavity, the fluid cavity is sealed and installed inside the gate valve body, and the upper and lower sides of the fluid cavity are respectively connected to fluid channel one and fluid channel two, a double gate is arranged inside the fluid cavity, and the double gate is simultaneously adjusted by a parallel component, and the double gate can realize double sealing of fluid channel one and fluid channel two by the double gate.

[0006] Preferably, the fluid channel 1 and the fluid channel 2 are respectively installed on both sides of the gate valve body and are installed in parallel up and down.

[0007] Preferably, the linkage assembly is symmetrically arranged in two groups, including connecting rods, and the two connecting rods are coaxially installed at the ends of the magnetic transmission. The other end of the connecting rod is hinged to a rotating rod, and a rotating point is arranged in the middle of the rotating rod. The rotating point is installed in the operating cavity through an axis, and the rotating rod can rotate around the rotating point, and the rotating rod provides transmission force to the parallel assembly.

[0008] Preferably, the parallel component includes a push rod, two of which are sealably installed on the fluid cavity and can slide laterally, two drive rods are hinged on the push rod, and an equilateral quadrilateral mechanism formed by the four drive rods drives the upper and lower gate bodies, and double seals the fluid channel one and the fluid channel two at the same time through the two gate bodies.

[0009] Preferably, a limiting groove is provided on one end of the rotating rod driving the push rod, and the insertion rod on the push rod is horizontally inserted into the limiting groove. When the rotating rod pushes the push rod, the insertion rod slides in the limiting groove.

[0010] Preferably, an alloy conical surface is provided at the outer end of the gate body, and a stepped groove is provided at the connection between the fluid channel 1 and the fluid channel 2 and the fluid cavity. A valve seat sealing gasket is embedded in the stepped groove, and the valve seat sealing gasket is used to cooperate with the alloy conical surface to complete the gate valve sealing.

[0011] Preferably, a sealing ring is arranged on the outer surface of the inclined surface of the alloy conical surface, the valve seat sealing gasket has an inclined surface with the same inclination as the alloy conical surface, and a ring groove for embedding the sealing ring is opened on the inclined surface.

[0012] Preferably, the magnetic actuator is driven by an adjusting actuator installed on the top of the transmission support frame.

[0013] Preferably, a valve cover is installed on the side wall of the gate valve body for easy disassembly and maintenance.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention blocks two fluid channels by arranging double gates in the fluid cavity, and when one gate fails in sealing, the other gate can still complete the sealing function, thus avoiding the situation of sealing failure;

[0015] By setting the equilateral quadrilateral mechanism of the linkage assembly to cooperate with the parallel assembly, the synchronous movement of the two gates can be completed to ensure the synchronization of the sealing action;

[0016] By providing the alloy conical surface of the gate body, the sealing effect with the valve seat gasket is increased, and a better sealing effect can still be maintained under high temperature working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the internal structure of the present invention;

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

[0020] Figure 3 It is a schematic diagram of the linkage component structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the parallel component structure of the present invention.

[0022] Figure 5 For the present invention Figure 1 Schematic diagram of the local enlarged structure of part A.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1-adjusting actuator, 2-transmission support frame, 3-gate valve body, 4-fluid channel one, 5-fluid channel two, 6-valve cover, 7-fluid chamber, 8-magnetic actuator, 9-linkage assembly, 901-connecting rod, 902-rotating rod, 903-rotating point, 904-limiting groove, 10-parallel assembly, 1001-push rod, 1002-insertion rod, 1003-driving rod, 1004-gate body, 1005-alloy conical surface, 1006-step groove, 1007-valve seat sealing gasket, 1008-sealing ring. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-5 The present invention provides a technical solution: a double-sealed wedge-shaped double-disc gate valve, comprising a gate valve body 3 and a transmission support frame 2 installed on the upper part of the gate valve body 3, a magnetic actuator 8 is installed on the transmission support frame 2, and the magnetic actuator 8 is driven by an adjustment actuator 1 installed on the top of the transmission support frame 2; the adjustment actuator 2 can send a drive signal to the magnetic actuator 6, and the magnetic actuator 6 can be pushed downward. The working principle of the magnetic actuator 8 drive: refer to the announcement number CN208252799U, a multi-drive type open parallel double-disc alloy sealed magnetic gate valve.

[0027] A fluid cavity 7 is provided inside the gate valve body 3, and the lower driving end of the magnetic actuator 8 extends into the inner cavity of the gate valve body 3. The space between the fluid cavity 7 and the inner cavity of the gate valve body 3 is an operating cavity. The operating cavity and the fluid cavity 7 are sealed. A linkage component 9 connected to the magnetic actuator 8 is provided in the operating cavity. The fluid cavity 7 is sealed and installed inside the gate valve body 3, and the upper and lower sides of the fluid cavity 7 are respectively connected to the fluid channel 1 4 and the fluid channel 2 5. A double gate plate is arranged inside the fluid cavity 7, and the double gate plates are simultaneously adjusted by a parallel component 10. The double gate plates can realize double sealing of the fluid channel 1 4 and the fluid channel 2 5; the fluid channel 1 4 and the fluid channel 2 5 are respectively installed on both sides of the gate valve body 3, and are installed in parallel up and down.

[0028] In one of the embodiments, in order to ensure the synchronization of the drive, in this embodiment, the linkage assembly 9 is symmetrically arranged with two groups, including a connecting rod 901, and the two connecting rods 901 are coaxially installed at the end of the magnetic transmission device 8. The other end of the connecting rod 901 is hinged to the rotating rod 902, and a rotating point 903 is arranged in the middle of the rotating rod 902. The rotating point 903 is installed in the operating cavity through an axis. The rotating rod 902 can rotate around the rotating point 903, and the rotating rod 902 provides transmission force to the parallel assembly 10; the rotating rod 902 drives the push rod 1001 to open a limiting groove 904 on one end, and the insertion rod 1002 on the push rod 1001 is horizontally inserted in the limiting groove 904. When the rotating rod 902 pushes the push rod 1001, the insertion rod 1002 slides in the limiting groove 904.

[0029] The parallel component 10 includes a push rod 1001, two push rods 1001 are sealed and installed on the fluid chamber 7, and can slide laterally. Two driving rods 1003 are hinged on the push rod 1001. The equilateral quadrilateral mechanism formed by the four driving rods 1003 drives the upper and lower gate bodies 1004, and the fluid channel 1 4 and the fluid channel 2 5 are doubly sealed at the same time through the two gate bodies 1004.

[0030] When in use, the magnetic transmission device 8 drives downward after receiving the driving instruction of the regulating actuator 1, pushing the connecting rods 901 on both sides to be squeezed toward both sides, and the connecting rod 901 is connected to one end of the rotating rod 902 to push the rotating rod 902 around the rotating point 903, and the limiting groove 904 at the other end of the rotating rod 902 pushes the insertion rod 1002 on the push rod 1001, and the two groups of push rods 1001 are pushed simultaneously along the inside of the fluid cavity 7, and the inner end of the push rod 1001 pushes the driving rod 1003, and the two gate bodies 1004 set up above and below are squeezed and sealed to the upper and lower sides at the same time through the equilateral quadrilateral formed by the four groups of driving rods 1003. When the sealing of one gate body 1004 fails, the other gate body 1004 can continue to complete the sealing operation.

[0031] An alloy conical surface 1005 is provided at the outer end of the gate body 1004, and a stepped groove 1006 is provided at the connection between the fluid channel 1 4 and the fluid channel 2 5 and the fluid cavity 7. A valve seat sealing gasket 1007 is embedded in the stepped groove 1006. The valve seat sealing gasket 1007 is used to cooperate with the alloy conical surface 1005 to complete the gate valve sealing.

[0032] In order to ensure the sealing between the alloy conical surface 1005 and the valve seat sealing gasket 1007, a sealing ring 1008 is arranged on the inclined outer surface of the alloy conical surface 1005, and the valve seat sealing gasket 1007 has an inclined surface with the same inclination as the alloy conical surface 1005, and an annular groove for embedding the sealing ring 1008 is opened on the inclined surface; when the alloy conical surface 1005 squeezes and seals the valve seat sealing gasket 1007, the inclined surfaces are squeezed and contacted together, the sealing ring 1008 is embedded in the annular groove, and the alloy conical surface 1005 seals the fluid channel.

[0033] A valve cover 6 is mounted on the side wall of the gate valve body 3 for easy disassembly and maintenance, and can be used for quick maintenance.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A double-seal wedge-shaped double-disc gate valve, characterized in that: The invention comprises a gate valve body (3) and a transmission support frame (2) installed on the upper part of the gate valve body (3), a magnetic transmission device (8) being installed on the transmission support frame (2), a fluid cavity (7) being provided inside the gate valve body (3), a lower driving end of the magnetic transmission device (8) extending into the inner cavity of the gate valve body (3), a space between the fluid cavity (7) and the inner cavity of the gate valve body (3) being an operating cavity, a linkage component (9) connected to the magnetic transmission device (8) being provided in the operating cavity, the fluid cavity (7) being sealed and installed inside the gate valve body (3), and the upper and lower sides of the fluid cavity (7) being connected to a fluid channel 1 (4) and a fluid channel 2 (5) respectively, a double gate plate being provided inside the fluid cavity (7), and the double gate plates being simultaneously adjusted by a parallel component (10), and the double gate plates being able to realize double sealing of the fluid channel 1 (4) and the fluid channel 2 (5); The fluid channel 1 (4) and the fluid channel 2 (5) are respectively installed on both sides of the gate valve body (3) and are installed in parallel up and down; The linkage assembly (9) is symmetrically provided with two groups, including connecting rods (901), the two connecting rods (901) are coaxially mounted on the ends of the magnetic transmission device (8), the other ends of the connecting rods (901) are hinged to the rotating rods (902), the middle part of the rotating rods (902) is provided with a rotating point (903), the rotating point (903) is mounted in the operating chamber through an axis, the rotating rods (902) can rotate around the rotating point (903), and the rotating rods (902) provide transmission force for the parallel assembly (10); The parallel assembly (10) comprises a push rod (1001), two push rods (1001) are sealed and installed on the fluid chamber (7) and can slide laterally, two driving rods (1003) are hinged on the push rod (1001), and the equilateral quadrilateral mechanism formed by the four driving rods (1003) drives the upper and lower gate bodies (1004), and the two gate bodies (1004) simultaneously perform double sealing on the fluid channel 1 (4) and the fluid channel 2 (5); A limiting groove (904) is provided on one end of the rotating rod (902) driving the push rod (1001), and the insertion rod (1002) on the push rod (1001) is inserted horizontally into the limiting groove (904). When the rotating rod (902) pushes the push rod (1001), the insertion rod (1002) slides in the limiting groove (904); The outer end of the gate body (1004) is provided with an alloy conical surface (1005), and a stepped groove (1006) is provided at the connection between the fluid channel 1 (4) and the fluid channel 2 (5) and the fluid cavity (7). A valve seat sealing gasket (1007) is embedded and installed in the stepped groove (1006), and the valve seat sealing gasket (1007) is used to cooperate with the alloy conical surface (1005) to complete the sealing of the gate valve.

2. A double-sealed wedge-shaped double-disc gate valve according to claim 1, characterized in that: A sealing ring (1008) is arranged on the outer surface of the inclined surface of the alloy conical surface (1005); the valve seat sealing gasket (1007) has an inclined surface with the same inclination as the alloy conical surface (1005), and a ring groove for embedding the sealing ring (1008) is opened on the inclined surface.

3. A double-sealed wedge-shaped double-disc gate valve according to claim 1, characterized in that: The magnetic transmission device (8) is driven by an adjustment actuator (1) installed on the top of the transmission support frame (2).

4. A double-sealed wedge-shaped double-disc gate valve according to claim 1, characterized in that: A valve cover (6) is installed on the side wall of the gate valve body (3) to facilitate disassembly and maintenance.

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