High pressure double seal gate valve

Abstract

The application discloses a high-pressure double-seal gate valve, which comprises a valve body, a valve cover installed on the valve body, a valve rod installed on the valve cover and extending into the valve body, a gate plate installed on one end of the valve rod in the valve body, and sealing packing installed between the valve cover and the valve rod, wherein a sealing mechanism connected with the valve body is arranged at the position of the valve rod between the gate plate and the sealing packing, the valve rod control sealing mechanism has a first sealing state and a second sealing state, the sealing mechanism is in the first sealing state when the gate plate is in an open state, the sealing mechanism is in the second sealing state when the gate plate is in a closed state, and the flow of fluid medium towards the sealing packing is limited when the sealing mechanism is in the first sealing state or the second sealing state. The application has the advantages and effects that the double-seal structure can reduce the leakage probability between the valve rod and the valve cover, the gate valve can better adapt to severe working conditions, and the performance of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve, in particular to a high-pressure double-seal gate valve. BACKGROUND

[0002] The opening and closing part of the gate valve is a gate plate, the movement direction of the gate plate is perpendicular to the fluid direction, and the gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The gate valve is sealed by the contact between the valve seat and the gate plate, and the sealing surface is usually hardfaced with wear-resistant metal material to increase the wear resistance. The gate plate has a rigid gate plate and an elastic gate plate, and the gate valve is divided into a rigid gate valve and an elastic gate plate according to the gate plate.

[0003] The application range of the gate valve is extremely wide, and it can be seen in many harsh and severe working conditions. However, the existing gate valve structure has certain limitations, and the sealing between the valve stem and the valve cover is only realized by relying on the sealing filler. When the gate valve is applied to those harsh and severe working conditions, the sealing effect cannot be achieved by relying on the sealing filler alone, which makes the gate valve prone to leakage when it is faced with such harsh working conditions. In view of the above situation, the present application arises at the historic moment. SUMMARY

[0004] The purpose of the present application is to provide a high-pressure double-seal gate valve, which reduces the probability of leakage between the valve stem and the valve cover through a double-seal structure, so that the gate valve can better adapt to harsh working conditions and improve the performance of the product.

[0005] The above technical purpose of the present application is realized by the following technical scheme: a high-pressure double-seal gate valve, comprising a valve body, a valve cover installed on the valve body, a valve stem installed on the valve cover and extending into the inside of the valve body, a gate plate installed on one end of the valve stem inside the valve body, and a sealing filler installed between the valve cover and the valve stem, the valve stem is provided with a sealing mechanism connected to the valve body at a position between the gate plate and the sealing filler, the valve stem control sealing mechanism has a first sealing state and a second sealing state, when the gate plate is in an open state, the sealing mechanism is in the first sealing state; when the gate plate is in a closed state, the sealing mechanism is in the second sealing state, when the sealing mechanism is in the first sealing state or the second sealing state, the flow of fluid medium towards the sealing filler is limited.

[0006] By adopting the technical scheme, the sealing mechanism is synchronously switched between the first sealing state and the second sealing state during the switching of the valve rod control gate between the open state and the closed state. When the gate is in the open state, the sealing mechanism is in the first sealing state; when the gate is in the closed state, the sealing mechanism is in the second sealing state. The fluid medium in the valve body is limited from flowing towards the sealing packing, and the sealing packing is arranged to realize double sealing. The probability of leakage between the valve rod and the valve cover is reduced, the gate valve can better adapt to severe working conditions, and the performance of the product is improved. The sealing mechanism is arranged in a movable sealing manner to have better compensation capacity, can adapt to different working conditions such as high temperature and high pressure, and ensure the continuity of sealing and has higher sealing pressure.

[0007] Further, the sealing mechanism comprises a sealing member moving with the valve rod, an upper sealing seat arranged in the valve body and located between the sealing packing and the sealing member, and a lower sealing seat arranged in the valve body and located between the sealing member and the gate, the upper sealing seat and the lower sealing seat intersect with the movement path of the sealing member and cooperate with the sealing member to form a seal.

[0008] By adopting the technical scheme, the sealing member falls and moves towards the lower sealing seat during the falling of the gate driven by the valve rod, to cooperate with the lower sealing seat to form a seal. During the rising of the gate driven by the valve rod, the sealing member rises and moves towards the upper sealing seat, to cooperate with the upper sealing seat to form a seal.

[0009] Further, the sealing member comprises an upper sealing assembly and a lower sealing assembly, the lower sealing assembly comprises a lower linkage block moving with the valve rod, a lower sealing block movably arranged on the valve rod and located below the lower linkage block and cooperating with the lower sealing seat to form a seal, and a lower compensation spring connecting the lower sealing block and the lower linkage block, and the lower sealing block is formed with a pressurized sealing assembly.

[0010] By adopting the technical scheme, the lower sealing block is synchronously driven to move by the lower compensation spring during the movement of the lower linkage block driven by the valve rod, and the lower sealing block abuts against the lower sealing seat to achieve a sealing effect. The lower compensation spring can better compensate for the error between components to ensure stable sealing of the structure and the gate. The pressurized sealing assembly is arranged to increase the sealing pressure of the lower sealing block, so that a stronger sealing effect can be achieved to adapt to more severe working conditions.

[0011] Further, the lower sealing block comprises a main body part sealingly sliding on the valve stem and a sealing part sealingly sliding on the main body part and facing the lower sealing seat, the sealing part reciprocates along the axis of the valve stem, and the lower compensation spring is arranged on the side of the main body part opposite to the sealing part and connects the main body part and the lower linkage block.

[0012] By using the above technical scheme, the sealing part abuts against the lower sealing seat to form a seal.

[0013] Further, the pressurized sealing assembly comprises a pressurized cavity formed in the main body part, a pressurized block reciprocally sliding in the pressurized cavity along the axis of the valve stem, a connecting rod fixedly connecting the pressurized block and the lower linkage block, and an air passage, the connecting rod passes through the main body part and sealingly slides with the main body part, the pressurized block divides the pressurized cavity into an upper cavity and a lower cavity, the lower cavity is communicated with the sealing part, the air passage communicates the upper cavity with the outside, and the thickness of the sealing part is smaller than the width of the pressurized block.

[0014] By using the above technical scheme, the lower compensation spring is used to position the distance between the main body part and the lower linkage block, when the sealing part abuts against the lower sealing seat, the valve stem continues to move downward, the valve stem drives the pressurized block to extrude the lower cavity, a high pressure is formed in the lower cavity, and the sealing part is further driven to abut against the lower sealing seat to increase the sealing pressure of the sealing part abutting against the lower sealing seat. By setting the thickness of the sealing part to be smaller than the width of the pressurized block, the force can be better amplified.

[0015] Further, the upper sealing assembly comprises an upper sealing block moving with the valve stem and an upper one-way valve installed on the upper sealing seat, and the upper sealing block is provided with a self-sealing structure.

[0016] By using the above technical scheme, the valve stem drives the upper sealing block to move towards the upper valve seat, and a seal is formed by the upper sealing block abutting against the upper valve seat. The upper one-way valve can discharge the fluid medium in the cavity above the upper valve seat to reduce the pressure on the sealing packing, thereby ensuring the effective sealing of the sealing packing.

[0017] Further, the self-sealing structure comprises a self-sealing plate sealingly sliding on the upper sealing block along the axis of the valve stem and forming a seal with the upper sealing seat, and a striking surface formed on the side of the self-sealing plate opposite to the upper sealing seat.

[0018] By using the above technical scheme, when the upper sealing block abuts against and seals the upper sealing seat, the pressure in the valve cavity acts on the striking surface to drive the self-sealing plate to move upward and abut against the upper sealing seat to form multiple self-seals.

[0019] Further, the valve body is provided with an embedded groove, the lower mounting seat and the upper mounting seat are sealingly embedded in the embedded groove, the upper sealing seat is arranged on the upper mounting seat, and the lower sealing seat is arranged on the lower mounting seat.

[0020] By adopting the technical scheme, the lower mounting seat, the upper mounting seat and the embedding groove are matched to form the upper mounting seat and the lower mounting seat structure in the valve body and to realize convenient assembly of the structure.

[0021] In conclusion, the application has the following advantages: the double sealing structure is adopted to reduce the leakage probability between the valve stem and the valve cover, so that the gate valve can better adapt to severe working conditions and improve the performance of the product. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure schematic view of the embodiment in the second sealing state;

[0023] Figure 2 Structure schematic view of the embodiment in the second sealing state; Figure 1 Enlarged view of A part;

[0024] Figure 3 Structure schematic view of the embodiment in the second sealing state; Figure 2 Enlarged view of B part;

[0025] Figure 4 Structure schematic view of the embodiment in the second sealing state;

[0026] Figure 5 Structure schematic view of the embodiment in the second sealing state; Figure 4 Enlarged view of C part.

[0027] In the figure: 1, valve body; 2, valve cover; 3, valve stem; 4, gate plate; 5, sealing packing; 6, hand wheel; 7, sealing mechanism; 71, upper sealing seat; 72, lower sealing seat; 73, upper sealing assembly; 731, upper sealing block; 732, upper one-way valve; 74, lower sealing assembly; 741, lower linkage block; 742, lower sealing block; 7421, main body part; 7422, sealing part; 743, lower compensation spring; 8, pressurized sealing assembly; 81, pressurized block; 82, connecting rod; 83, air channel; 84, upper cavity; 85, lower cavity; 9, self-sealing structure; 91, self-sealing plate; 92, impact surface; 10, embedding groove; 11, lower mounting seat; 12, upper mounting seat. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1 to 5The utility model provides a high pressure double seal gate valve, including valve body 1, fixedly installed on the valve body 1 valve cover 2, install the valve stem 3 in the valve cover 2 and extend into the inside of valve body 1, fixedly installed in the valve stem 3 one end inside valve body 1's gate 4 and fill the sealing packing 5 between valve cover 2 and valve stem 3, and the handle 6 of connecting valve stem 3 is installed on the valve cover 2. The sealing mechanism 7 of the valve body 1 is provided with the position of valve stem 3 between gate 4 and sealing packing 5, and valve stem 3 controls sealing mechanism 7 to have first sealing state and second sealing state. When gate 4 is in the open state, sealing mechanism 7 is in the first sealing state, and when gate 4 is in the closed state, sealing mechanism 7 is in the second sealing state. When sealing mechanism 7 is in the first sealing state or the second sealing state, the flow of fluid medium towards sealing packing 5 is limited.

[0030] Sealing mechanism 7 includes sealing member moving with valve stem 3, upper sealing seat 71 arranged in valve body 1 and located between sealing packing 5 and sealing member and lower sealing seat 72 arranged in valve body 1 and located between sealing member and gate 4, and the movement path of the sealing member is intersected by the upper sealing seat 71 and the lower sealing seat 72, and the sealing member is sealed by cooperating with the sealing member. The inner wall of valve body 1 is provided with an embedding groove 10, and the lower mounting seat 11 and the upper mounting seat 12 are tightly fitted and embedded in the embedding groove 10, and the upper sealing seat 71 is integrally arranged in the upper mounting seat 12, and the lower sealing seat 72 is integrally arranged in the lower mounting seat 11. The lower mounting seat 11 and the upper mounting seat 12 are installed into the embedding groove 10 by cold mounting.

[0031] The sealing member includes an upper sealing assembly 73 and a lower sealing assembly 74, the lower sealing assembly 74 includes a lower linkage block 741 integrally arranged on the valve stem 3, a lower sealing block 742 sleeved on the valve stem 3 and located below the lower linkage block 741 and sealed by cooperating with the lower sealing seat 72, and a lower compensation spring 743 connecting the lower sealing block 742 and the lower linkage block 741. The lower sealing block 742 is formed with a pressurized sealing assembly 8, and the lower sealing block 742 is in sealing sliding cooperation with the valve stem 3.

[0032] The lower sealing block 742 includes a main body part 7421 sealingly and slidingly arranged on the valve stem 3 and a sealing part 7422 sealingly and slidingly arranged on the side of the main body part 7421 facing the lower sealing seat 72. The sealing part 7422 reciprocates along the axis of the valve stem 3, and the lower compensation spring 743 is arranged on the side of the main body part 7421 opposite to the sealing part 7422 and connects the main body part 7421 and the lower linkage block 741.

[0033] The pressurized sealing assembly 8 comprises a pressurized cavity formed in the main body 7421, a pressurized block 81 reciprocally sliding along the axis of the valve stem 3 and sealingly arranged in the pressurized cavity, a connecting rod 82 fixedly connecting the pressurized block 81 and the lower linkage block 741, and an air passage 83. The connecting rod 82 sealingly and slidingly penetrates the main body 7421, and the pressurized block 81 divides the pressurized cavity into an upper cavity 84 and a lower cavity 85. The lower cavity 85 communicates with the sealing portion 7422 for driving the sealing portion 7422 to move, the air passage 83 is formed in the valve stem 3, the connecting rod 82, the lower linkage block 741 and the pressurized block 81 for communicating the upper cavity 84 with the outside, and the thickness of the sealing portion 7422 is less than the width of the pressurized block 81. The lower compensation spring 743 is sleeved on the connecting rod 82.

[0034] The upper sealing assembly 73 comprises an upper sealing block 731 integrally arranged on the valve stem 3 and an upper one-way valve 732 sealingly mounted on the upper sealing seat 71. The upper one-way valve 732 limits the upward flow of fluid, and the upper sealing block 731 is provided with a self-sealing structure 9. The self-sealing structure 9 comprises a self-sealing plate 91 sealingly and slidingly arranged on the upper sealing block 731 along the axis of the valve stem 3 and sealingly cooperating with the upper sealing seat 71, and a striking surface 92 formed on the self-sealing plate 91 opposite the upper sealing seat 71.

[0035] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application and are protected by the patent law.

Claims

1. A high-pressure double-seal gate valve, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), a valve stem (3) mounted on the valve cover (2) and extending into the valve body (1), a gate plate (4) mounted on one end of the valve stem (3) located inside the valve body (1), and sealing packing (5) mounted between the valve cover (2) and the valve stem (3), characterized in that: The valve stem (3) is positioned between the gate (4) and the sealing packing (5) and is equipped with a sealing mechanism (7) that connects to the valve body (1). The valve stem (3) controls the sealing mechanism (7) to have a first sealing state and a second sealing state. When the gate (4) is in the open state, the sealing mechanism (7) is in the first sealing state; when the gate (4) is in the closed state, the sealing mechanism (7) is in the second sealing state. When the sealing mechanism (7) is in the first sealing state or the second sealing state, it restricts the fluid medium from flowing towards the sealing packing (1). 5) Flow, the sealing mechanism (7) includes a sealing member that moves with the valve stem (3), an upper sealing seat (71) disposed within the valve body (1) and located between the sealing packing (5) and the sealing member, and a lower sealing seat (72) disposed within the valve body (1) and located between the sealing member and the gate (4). The upper sealing seat (71) and the lower sealing seat (72) both intersect with the movement path of the sealing member and cooperate with the sealing member to form a seal. The sealing member includes an upper sealing assembly (73) and a lower sealing assembly (74). The lower sealing assembly (74) The assembly includes a lower linkage block (741) that moves with the valve stem (3), a lower sealing block (742) that is slidably disposed on the valve stem (3) and located below the lower linkage block (741) and cooperates with the lower sealing seat (72) to form a seal, and a lower compensation spring (743) that connects the lower sealing block (742) and the lower linkage block (741). A pressure sealing assembly (8) is formed inside the lower sealing block (742). The lower sealing block (742) includes a main body (7421) that is slidably disposed on the valve stem (3) and a main body (7421) that is slidably disposed on the main body (7421). The sealing part (7422) facing the lower sealing seat (72) reciprocates along the axis of the valve stem (3). The lower compensating spring (743) is disposed on the side of the main body (7421) opposite to the sealing part (7422) and connects the main body (7421) and the lower linkage block (741). The upper sealing assembly (73) includes an upper sealing block (731) that moves with the valve stem (3) and an upper check valve (732) installed on the upper sealing seat (71). The upper sealing block (731) is provided with a self-sealing structure (9).

2. The high-pressure double-seal gate valve according to claim 1, characterized in that: The pressurized sealing assembly (8) includes a pressurized chamber formed in the main body (7421), a pressurized block (81) that is reciprocally slidably disposed in the pressurized chamber along the axis of the valve stem (3), a connecting rod (82) that is fixedly connected to the pressurized block (81) and the lower linkage block (741), and an air passage (83). The connecting rod (82) passes through the main body (7421) and is sealed and slidably engaged with it. The pressurized block (81) divides the pressurized chamber into an upper cavity (84) and a lower cavity (85). The lower cavity (85) is connected to the sealing part (7422). The air passage (83) connects the upper cavity (84) to the outside. The thickness of the sealing part (7422) is less than the width of the pressurized block (81).

3. The high-pressure double-seal gate valve according to claim 1, characterized in that: The self-sealing structure (9) includes a self-sealing plate (91) which is slidably disposed on the upper sealing block (731) along the valve stem (3) axis and cooperates with the upper sealing seat (71) to form a seal, and an impact surface (92) formed on the side of the self-sealing plate (91) opposite to the upper sealing seat (71).

4. The high-pressure double-seal gate valve according to claim 1, characterized in that: The valve body (1) is provided with a groove (10), and a lower mounting seat (11) and an upper mounting seat (12) are sealed and fitted in the groove (10). The upper sealing seat (71) is disposed on the upper mounting seat (12) and the lower sealing seat (72) is disposed on the lower mounting seat (11).

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