Pilot pressure-equalizing sealing valve

Abstract

The utility model provides a pilot pressure-equalizing sealing valve, which relates to the technical field of pressure-equalizing valves, and comprises a valve body, a valve core, a lifting system and a pilot system, and when the output end of the lifting system drives the valve core to lift, the output end of the lifting system synchronously drives the pilot system to lift along with the valve core. And a pilot valve plug arranged at the output end of the pilot system and a pilot valve seat located on the valve element are kept relatively standing, and the communicating state of the air inlet cavity and the air outlet cavity is maintained till the pilot pressure-equalizing sealing valve is completely opened or closed. The air inlet cavity and the air outlet cavity are always kept in a communicated state in the process that the pilot pressure-equalizing sealing valve is completely opened or closed, the pressure difference of the air inlet cavity and the air outlet cavity at the moment of opening or closing the valve element is reduced, and the situation that due to the large pressure difference of air pressure of the two cavities, instantaneous liquid seal groove alloy splashing loss is caused is prevented. The technical problem of how to ensure that the alloy waste is reduced to the maximum extent in the opening or closing process of the liquid metal sealing valve in the high-temperature environment in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of equalizing pressure valves, in particular to a pilot equalizing pressure sealing valve. Background Art

[0002] In order to achieve the tight closure of the sealing valve during the dust removal switching of the high-temperature coal gas generated by coal pyrolysis, the Chinese patent "A liquid metal sealing valve for gas pipelines in high-temperature environments" with publication number CN103629381A and the Chinese patent "An improved liquid metal sealing valve for gas pipelines in high-temperature environments" with publication number CN103615586A, both technical solutions adopt the method of setting a liquid metal sealing groove at the bottom of the valve body, matching the valve core and other necessary structures, which can achieve absolute sealing of high-temperature coal gas. At the same time, the two solutions adopt two different multi-channel sealing solutions to prevent the problems of metal liquid splashing and pressure instability. However, in actual applications, when the contact depth between the valve core and the liquid metal in the sealing groove is less than a certain value, due to the instantaneous and violent fluctuations in air pressure, part of the alloy liquid will still be blown out by the gas, resulting in alloy waste and increased production costs.

[0003] How to ensure that the liquid metal sealing valve can minimize alloy waste during opening or closing in a high temperature environment has become a problem that needs to be solved. In view of this, this solution is proposed.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model aims to provide a pilot pressure-equalizing sealing valve to solve the technical problem in the prior art of how to minimize alloy waste during the opening or closing of a liquid metal sealing valve in a high-temperature environment.

[0006] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0007] The utility model provides a pilot pressure-equalizing sealing valve, comprising a valve body, a valve core, a lifting system and a pilot system;

[0008] The lifting system is arranged on the valve body, the output end of the lifting system is connected to the valve core, the pilot system is arranged on the output end of the lifting system, and the output end of the lifting system is used to control the lifting of the valve core and drive the pilot system to lift and lower together with the valve core;

[0009] The valve body comprises an air inlet chamber and an air outlet chamber respectively located on both sides of the valve core, and a pilot valve seat for connecting the air inlet chamber and the air outlet chamber is provided at the top of the valve core;

[0010] The output end of the pilot system is provided with a pilot valve plug for controlling the lifting and lowering of the pilot valve plug. The pilot valve plug cooperates with the pilot valve seat to control the connection state between the air inlet chamber and the air outlet chamber.

[0011] Further, the pilot system includes a pilot mechanism and a pilot valve stem;

[0012] The pilot mechanism is arranged on the lifting system and is used to control the extension and retraction of the pilot valve stem;

[0013] One end of the pilot valve stem is connected to the output end of the pilot mechanism, and the other end is connected to the pilot valve plug.

[0014] Furthermore, the pilot valve stem is connected to the straight hole on the pilot valve plug via a straight rod, or the pilot valve stem is connected to the ball socket on the pilot valve plug via a ball head.

[0015] Furthermore, the pilot valve seat also includes a pilot valve core arranged on the inner side of the pilot valve seat, and the pilot valve core and the pilot valve plug cooperate with each other to seal the pilot valve seat.

[0016] Further, the size of the sealing surface of the pilot valve core matches the size of the sealing surface of the pilot valve plug;

[0017] The axial cross-sections of the sealing surface of the pilot valve core and the sealing surface of the pilot valve plug are both conical structures, or the axial cross-sections are both parts of a spherical surface, or the top of the pilot valve core is a knife-edge annular protrusion;

[0018] When the top of the pilot valve core is a knife-edge annular protrusion, the bottom sealing surface of the pilot valve plug is a plane structure, and the width of the annular protrusion is ≤2 mm, preferably 0.5 mm.

[0019] Furthermore, the lifting system includes a lifting mechanism and a power mechanism arranged on the valve body;

[0020] The input end of the lifting mechanism is connected to the output end of the power mechanism, and the output end of the lifting mechanism is connected to the valve core;

[0021] The lifting system further comprises a support rod arranged on the valve body and a support seat arranged on the upper end of the support rod, and the lifting mechanism is arranged on the support seat;

[0022] The lifting system also includes an upper valve stem, a lower valve stem and a connecting frame for setting a pilot mechanism, one end of the upper valve stem is connected to the output end of the lifting mechanism, and the other end passes through the support seat and is connected to the connecting frame, one end of the lower valve stem is connected to the connecting frame, and the other end passes through the top of the valve body and is connected to the top of the valve core, the lower valve stem is sleeved outside the pilot valve stem, and the lower valve stem is a hollow structure;

[0023] The lifting mechanism comprises a nut and a lead screw which moves in cooperation with the nut, and the output end of the lead screw is connected to the upper valve stem.

[0024] Furthermore, the connection frame includes support plate 1, support plate 2 and support plate 3 from top to bottom, and the support plate 1, support plate 2 and support plate 3 are all connected by a pull rod;

[0025] An upper end of the support plate is connected to the upper valve stem;

[0026] The pilot mechanism is arranged on the second support plate, and the end of the pilot valve stem connected to the pilot valve plug passes through the second support plate and the third support plate in sequence and is connected to the pilot valve plug;

[0027] The three lower ends of the support plate are connected to the lower valve stem.

[0028] Furthermore, the valve core includes an end cover and an annular structure arranged on the lower end surface of the end cover;

[0029] The annular structure cooperates with the liquid seal groove arranged on the valve body to seal each other; the pilot valve seat is arranged on the end cover;

[0030] The end cover is provided with a second support rod and a second support seat arranged at the upper end of the second support rod, the second support seat is connected to the lower valve stem and sleeved outside the pilot valve stem;

[0031] The end cover is coaxially arranged with the pilot valve seat.

[0032] Furthermore, a guide pipe is provided on the end cover on one side facing the air inlet chamber, and the guide pipe is connected to the pilot valve seat;

[0033] A guide seat is provided between the annular inner walls of the liquid seal groove, the guide seat is connected to the annular inner wall of the liquid seal groove through a connecting rib, a guide hole is provided on the guide seat and is located opposite to the guide tube, and the guide hole is sleeved outside the guide tube;

[0034] The guide tube and the guide hole cooperate with each other to guide the valve core to rise and fall along the extending direction of the guide tube;

[0035] The guide tube and the guide hole are in clearance fit;

[0036] The lower valve stem, the pilot valve stem, the pilot valve plug, the guide tube and the guide hole are all coaxially arranged.

[0037] Furthermore, it also includes a guide sleeve arranged on the inner side of the lower end of the lower valve stem, and the guide sleeve is arranged outside the pilot valve stem;

[0038] The inner diameter of the guide sleeve matches the outer diameter of the pilot valve stem.

[0039] The utility model provides a pilot pressure-equalizing sealing valve, which controls the lifting and lowering of the pilot valve plug through the output end of the pilot system, and cooperates with the pilot valve seat to achieve the function of controlling the connection state of the air inlet chamber and the air outlet chamber; by setting the pilot system on the output end of the lifting system, it moves synchronously with the output end of the lifting system 3, and when the output end of the lifting system drives the valve core to lift and lower, it drives the pilot system 5 to lift and lower with the valve core, so that the pilot valve plug set at the output end of the pilot system and the pilot valve seat located on the valve core remain relatively still, and the connection state of the air inlet chamber and the air outlet chamber is maintained until the pilot pressure-equalizing sealing valve is fully opened or closed. In the process of fully opening or closing the pilot pressure-equalizing sealing valve, the air inlet chamber and the air outlet chamber are always kept in a connected state, reducing the pressure difference between the air inlet chamber and the air outlet chamber at the moment when the valve core is opened or closed, and preventing the instantaneous liquid sealing groove alloy splash loss due to the large pressure difference between the two chambers at the moment of opening and closing the sealing valve. The invention solves the technical problem existing in the prior art of how to ensure that the waste of alloy is minimized during the opening or closing process of the liquid metal sealing valve in a high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 This is a schematic diagram of the overall structure of the pilot pressure equalizing sealing valve provided in Example 1 of the utility model;

[0042] Figure 2 A schematic diagram of the structure of the connection state between the pilot valve plug and the pilot valve core provided in Example 1 of the utility model;

[0043] Figure 3 A schematic diagram of the structure of the connection state between the pilot valve plug and the pilot valve core provided in Example 2 of the utility model;

[0044] Figure 4 This is a structural schematic diagram of the connection state of the pilot valve plug and the pilot valve core provided in Example 3 of the utility model.

[0045] Icon: 1-valve body; 11-inlet chamber; 12-outlet chamber;

[0046] 2-valve core; 21-end cover, 211-pilot valve seat; 212-pilot valve core; 213-guide tube; 22-annular structure; 23-second support seat; 24-second support rod;

[0047] 3-lifting system; 31-lifting mechanism; 311-screw; 312-nut; 32-upper valve stem; 33-connecting frame; 331-support plate 1; 332-support plate 2; 333-support plate 3; 334-pull rod; 34-lower valve stem; 35-support seat; 36-support rod; 37-power mechanism; 371-worm gear hollow shaft;

[0048] 4-liquid seal groove; 41-guide seat; 42-guide hole; 43-connecting rib;

[0049] 5-pilot system; 51-pilot mechanism; 52-pilot valve stem; 53-pilot valve plug;

[0050] 6-Guide sleeve. DETAILED DESCRIPTION

[0051] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0052] In the description of the present utility model, it should be noted that the terms "proximal end", "distal end", "front end", "rear end", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0053] The terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] On the one hand, the utility model provides a pilot pressure-equalizing sealing valve, including a valve body 1, a valve core 2, a lifting system 3 and a pilot system 5; the lifting system 3 is arranged on the valve body 1, and the output end of the lifting system 3 is connected to the valve core 2, and the pilot system 5 is arranged on the output end of the lifting system 3, and the output end of the lifting system 3 is used to control the lifting and lowering of the valve core 2 and drive the pilot system 5 to lift and lower together with the valve core 2; the valve body 1 includes an air inlet chamber 11 and an air outlet chamber 12 respectively located on both sides of the valve core 2, and the top of the valve core 2 is provided with a pilot valve seat 211 for connecting the air inlet chamber 11 and the air outlet chamber 12; the output end of the pilot system 5 is provided with a pilot valve plug 53 for controlling the lifting and lowering of the pilot valve plug 53, and the pilot valve plug 53 cooperates with the pilot valve seat 211 to control the connection state of the air inlet chamber 11 and the air outlet chamber 12.

[0056] The valve core 2 cooperates with the liquid sealing groove 4 for pouring liquid metal at the bottom of the valve body 1 for sealing, and controls the lifting and lowering of the pilot valve plug 53 through the output end of the pilot system 5, and cooperates with the pilot valve seat 211 to achieve the function of controlling the connection state of the air inlet chamber 11 and the air outlet chamber 12; by setting the pilot system 5 on the output end of the lifting system 3, it moves synchronously with the output end of the lifting system 3, and when the output end of the lifting system 3 drives the valve core 2 to rise and fall, it drives the pilot system 5 to rise and fall with the valve core 2, so that the pilot valve plug 53 set at the output end of the pilot system 5 and the pilot valve seat 21 located on the valve core 2 remain relatively static, and the connection state of the air inlet chamber 11 and the air outlet chamber 12 is maintained until the pilot pressure equalizing sealing valve is fully opened or closed. The inlet chamber 11 and the outlet chamber 12 are always connected during the process of fully opening or closing the pilot pressure-equalizing sealing valve, reducing the pressure difference between the inlet chamber 11 and the outlet chamber 12 when the valve core is opened or closed, and preventing the instantaneous splashing loss of the liquid sealing groove alloy due to the large pressure difference between the two chambers when the sealing valve is opened or closed. The technical problem of how to minimize the waste of alloy when the liquid metal sealing valve is opened or closed in the prior art under high temperature environment is solved.

[0057] The output end specifically refers to an end used for power output, specifically an end directly connected to a structure that receives power.

[0058] In some specific embodiments, the pilot system 5 includes a pilot mechanism 51 and a pilot valve stem 52;

[0059] The pilot mechanism 51 is arranged on the lifting system 3 and is used to control the extension and retraction of the pilot valve stem 52;

[0060] One end of the pilot valve stem 52 is connected to the output end of the pilot mechanism 51, and the other end is connected to the pilot valve plug 53

[0061] The extension and retraction of the pilot valve stem 52 is controlled by the pilot mechanism 51, so that the pilot valve plug connected to the pilot valve stem 52 moves up and down. When moving downward, it is tightly connected with the pilot valve seat 211, so that the air inlet chamber 11 and the air outlet chamber 12 are in a non-connected state; when moving upward, it is separated from the pilot valve seat 211, so that the air inlet chamber 11 and the air outlet chamber 12 are in a connected state.

[0062] The pilot mechanism 51 may be driven by a cylinder to control the extension and retraction of the pilot valve stem 52 . Relative to the pilot system 5 , the pilot valve stem 52 may serve as an output end of the pilot system 5 .

[0063] In order to enable the pilot valve stem 52 to accurately drive the pilot valve plug 53 , in some specific embodiments, the pilot valve stem 52 is connected to the straight hole on the pilot valve plug 53 via a straight rod.

[0064] It is found in actual use that a certain error may occur when the pilot valve plug 53 and the pilot valve seat 211 cooperate, and the pilot valve plug 53 and the pilot valve seat 211 cannot be tightly connected.

[0065] In some specific embodiments, the pilot valve stem 52 is connected to a ball socket on the pilot valve plug 53 via a ball head.

[0066] The connection between the ball head and the ball socket allows the pilot valve plug 53 to have a swing angle of 0 to 10° to compensate for possible errors between the pilot valve plug 53 and the pilot valve seat 211, so that the pilot valve plug 53 and the pilot valve seat 211 are more reliably and tightly connected.

[0067] In some specific implementations, the pilot valve seat 211 further includes a pilot valve core 212 disposed inside the pilot valve seat 211 , and the pilot valve core 212 cooperates with the pilot valve plug 53 to seal the pilot valve seat 211 .

[0068] The pilot valve core 212 is sealed and connected to the pilot valve seat 211 in an interference fit, so as to cooperate with the pilot valve plug 53 to seal the pilot valve seat 211 .

[0069] In some specific implementations, the size of the sealing surface of the pilot valve core 212 matches the size of the sealing surface of the pilot valve plug 53 .

[0070] In some specific implementations, the axial cross-sections of the sealing surface of the pilot valve core 212 and the axial cross-sections of the sealing surface of the pilot valve plug 53 are both conical structures.

[0071] In some specific embodiments, the axial cross-section of the sealing surface of the pilot valve core 212 and the axial cross-section of the sealing surface of the pilot valve plug 53 are both part of a spherical surface;

[0072] In some specific implementations, the top end of the pilot valve core 212 is a knife-edge annular protrusion, and the bottom sealing surface of the pilot valve plug 53 is a flat structure.

[0073] When the bottom sealing surface of the pilot valve plug 53 and the knife-edge annular protrusion at the top of the pilot valve core 212 are brought into close contact, the joint surface is an annular plane.

[0074] Specifically, the width of the annular protrusion is ≤2 mm.

[0075] Among them, the width of the annular protrusion can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, or it can be any value ≤2mm, preferably 0.5mm.

[0076] In some specific embodiments, the lifting system 3 includes a lifting mechanism 31 and a power mechanism 37 disposed at the top of the valve body 1;

[0077] The input end of the lifting mechanism 31 is connected to the output end of the power mechanism 37, and the output end of the lifting mechanism 31 is connected to the valve core 2;

[0078] The pilot mechanism 51 is arranged on the output end of the lifting mechanism 31;

[0079] In some specific embodiments, the lifting mechanism 31 includes a nut 312 and a screw 311 that moves in coordination with the nut 312, and the output end of the screw 311 is connected to the upper valve stem (32); the power mechanism 37 can selectively use a worm gear reducer, and the worm gear reducer rotates the worm hollow shaft 371 driven by the motor, and the lower end of the worm hollow shaft 371 is connected to the upper end of the nut 312 by a snap-fit ​​manner, thereby driving the nut 312 to rotate. Since the nut 312 cannot move up and down, the rotation of the nut 312 drives the screw 311 to move up and down, thereby realizing the movement of the lifting mechanism 31; the pilot mechanism 51 is arranged between the lifting mechanism 31 and the valve body 1, so that the pilot mechanism 51 can move with the movement of the lifting mechanism 31.

[0080] The lifting mechanism 31 realizes the movement of the lifting mechanism 31 through the structure of the nut 312 and the lead screw 311. Specifically, the rotation of the nut 312 drives the lead screw 311 to move up and down. At this time, for the lifting system 3, the lead screw 311 can be used as the output end of the lifting system 3.

[0081] In some specific embodiments, the lifting system 3 further includes a support rod 36 disposed on the valve body 1 and a support seat 35 disposed at the upper end of the support rod 36;

[0082] The lifting mechanism 31 is arranged on a support seat 35;

[0083] The pilot mechanism 51 is located between the support seat 35 and the valve body 1 .

[0084] A space for arranging the pilot mechanism 51 is formed between the lifting mechanism 31 and the top end of the valve body 1 by the support rod 36 and the support seat 35 .

[0085] In some specific embodiments, the lifting system 3 further includes an upper valve stem 32, a lower valve stem 34 and a connecting frame 33 for setting a pilot mechanism 51;

[0086] One end of the upper valve stem 32 is connected to the output end of the lifting mechanism 31, and the other end passes through the support seat 35 and is connected to the upper end of the connecting frame 33;

[0087] One end of the lower valve stem 34 is connected to the lower end of the connecting frame 33, and the other end passes through the top of the valve body 1 and is connected to the top of the valve core 2;

[0088] The lower valve stem 34 is sleeved outside the pilot valve stem 52 .

[0089] The output end of the lifting mechanism 31 is divided into an upper valve stem 32 and a lower valve stem 34 by the connecting frame 33 , so that the pilot mechanism 51 is arranged between the support seat 35 and the top of the valve body 1 and can move with the movement of the lifting mechanism 31 .

[0090] Among them, one end of the upper valve stem 32 is connected to the output end of the lifting mechanism 31, and the screw 311 drives the upper valve stem 32, the lower valve stem 34 and the connecting frame 33 to rise and fall. At this time, the upper valve stem 32, the lower valve stem 34 and the connecting frame 33 can be used as the output end of the lifting system 3.

[0091] In some specific implementations, the lower valve stem 34 is a hollow structure so as to be sleeved outside the pilot valve stem 52 .

[0092] Among them, the pilot valve seat 211 is a hollow structure, so that when the pilot pressure equalizing sealing valve is in a non-sealed state, the pilot valve seat 211 can connect the air inlet chamber 11 and the air outlet chamber 12; or when the pilot pressure equalizing sealing valve is in a sealed state, the pilot valve plug 53 and the pilot valve seat 211 can be sealed together.

[0093] In some specific implementations, the connection frame 33 includes a support plate 1 331, a support plate 2 332 and a support plate 3 333 from top to bottom, and the support plate 1 331, the support plate 2 332 and the support plate 3 333 are all connected by a pull rod 334;

[0094] The upper end of the support plate 1 331 is connected to the upper valve stem 32;

[0095] The pilot mechanism 51 is arranged on the second support plate 332, and one end of the pilot valve stem 52 connected to the pilot valve plug 53 passes through the second support plate 332 and the third support plate 333 in sequence and is connected to the pilot valve plug 53;

[0096] The lower end of the support plate 333 is connected to the lower valve stem 34 .

[0097] In some specific embodiments, the valve core 2 includes an end cover 21 and an annular structure 22 disposed on the lower end surface of the end cover 21;

[0098] The annular structure 22 and the liquid sealing groove 4 cooperate with each other to seal;

[0099] The end cap 21 is sealed with the annular structure 22, and the transverse cross-sectional shape and size of the annular structure 22 match the transverse cross-sectional shape and size of the liquid seal groove 4, so as to be inserted into the liquid seal groove 4 and form a seal with the liquid metal.

[0100] In some specific embodiments, the end cover 21 is provided with a second support rod 24 and a second support seat 23 disposed at the upper end of the second support rod 24, and the second support seat 23 is connected to the lower valve stem 34 and sleeved outside the pilot valve stem 52;

[0101] In some specific implementations, the end cover 21 and the pilot valve seat 211 are coaxially arranged.

[0102] In some specific implementations, a guide tube 213 is provided on the end cover 21 on a side facing the air inlet chamber 11 , and the guide tube 213 is communicated with the pilot valve seat 211 .

[0103] In some specific embodiments, a guide seat 41 is provided between the annular inner walls of the liquid seal groove 4, the guide seat 41 is connected to the annular inner wall of the liquid seal groove 4 through a connecting rib 43, a guide hole 42 is provided on the guide seat 41 and is located opposite to the guide tube 213, and the guide hole 42 is sleeved outside the guide tube 213;

[0104] The guide hole 42 is clearance-matched with the guide tube 213 to guide the valve core 2 to rise and fall along the extending direction of the guide tube 213 , and also has the function of connecting the air inlet chamber 11 and the air outlet chamber 12 .

[0105] In some specific implementations, the lower valve stem 34 , the pilot valve stem 52 , the pilot valve plug 53 , the guide tube 213 and the guide hole 42 are all coaxially arranged.

[0106] In order to guide the pilot valve stem 52 more accurately in the lower valve stem 34, in some specific embodiments, a guide sleeve 6 is provided on the inner side of the lower end of the lower valve stem 34, and the guide sleeve 6 is sleeved outside the pilot valve stem 52;

[0107] In some specific implementations, the inner diameter of the guide sleeve 6 matches the outer diameter of the pilot valve stem 52 .

[0108] When in use, the air inlet chamber 11 and the air outlet chamber 12 are connected before opening or closing the pilot pressure equalizing sealing valve. The connecting of the air inlet chamber 11 and the air outlet chamber 12 includes opening the pilot mechanism 51 to separate the pilot valve plug 53 from the pilot valve seat 211.

[0109] Due to the pre-opening of the pilot mechanism 51, the pilot valve plug 53 is separated from the pilot valve seat 211, and the pressure difference between the air inlet chamber 11 and the air outlet chamber 12 gradually decreases or even becomes zero. Therefore, when the valve core 2 gradually separates from or immerses in the liquid sealing groove 4, there is no instantaneous pressure difference, and the liquid metal (alloy) in the liquid sealing groove 4 does not splash, and the liquid metal (alloy) in the liquid sealing groove 4 does not generate loss.

[0110] It should be noted that before opening or closing the pilot pressure equalizing sealing valve, liquid alloy needs to be injected into the liquid sealing groove 4 or the height of the liquid alloy in the liquid sealing groove 4 needs to be kept to meet the design requirements.

[0111] After closing the pilot pressure equalizing sealing valve, the pilot mechanism 51 is closed to make the pilot valve plug 53 cooperate and connect with the pilot valve seat 211, so that the air inlet chamber 11 and the air outlet chamber 12 are in a non-connected state, and the pilot pressure equalizing sealing valve is in a closed state, that is, the sealing valve is completely in a sealed state.

[0112] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0113] Example 1

[0114] Combination Figure 1 and Figure 2To illustrate, a pilot pressure-equalizing sealing valve includes a valve body 1, a valve core 2, and a lifting system 3. The valve body 1 includes an air inlet chamber 11 and an air outlet chamber 12. The lifting system 3 includes a lifting mechanism 31. The lifting mechanism 31 is arranged above the top of the valve body 1. The lifting mechanism 31 is arranged above the support seat 35. A support rod 36 is arranged between the support seat 35 and the valve body 1. The upper part of the support rod 36 is fixedly connected to the support seat 35, and the lower part of the support rod 36 is fixedly connected to the top of the valve body 1. A power mechanism 37 is arranged above the lifting mechanism 31, and the power mechanism 37 is connected to the lifting mechanism 31. A liquid sealing groove 4 for pouring liquid metal is arranged at the bottom of the valve body 1. The lifting mechanism 31 is selected as a kinematic pair composed of a lead screw 311 and a nut 312, and the power mechanism 37 is selected as a worm gear Worm reducer, the worm reducer is driven by the motor to rotate the worm hollow shaft 371, and the lower end of the worm hollow shaft 371 is connected to the upper end of the nut 312 by a clamping method, thereby driving the nut 312 to rotate, so as to drive the lead screw 311 to move up and down; a liquid seal groove 4 for pouring liquid metal is arranged at the bottom of the valve body 1, the valve core 2 has an upper end cover 21 and a lower annular structure 22 which is a circular ring, the end cover 21 is sealed and connected to the circular ring, the circular ring matches the liquid seal groove 4, and can be inserted into the liquid seal groove 4 to form a seal with the liquid metal, and when the valve core 2 is sealed with the liquid seal groove 4, the valve body is divided into two chambers, wherein the side away from 31 is the air inlet chamber 11, and the other side is the air outlet chamber 12, and the end cover 21 of the valve core 2 is connected to the lifting system 3.

[0115] A second support seat 23 is arranged above the end cover 21 of the valve core 2, and a second support rod 24 is arranged between the second support seat 23 and the end cover 21 of the valve core 2. The upper end of the second support rod 24 is fixedly connected to the second support seat 23, and the lower end of the second support rod 24 is fixedly connected to the upper part of the end cover 21 of the valve core 2; the pilot pressure equalizing sealing valve also includes a pilot system 5, the pilot system 5 includes a pilot mechanism 51, the pilot mechanism 51 is a cylinder, and the pilot mechanism 51 is arranged in the middle position of the lifting system.

[0116] The lifting system 3 also includes an upper valve stem 32, a connecting frame 33, and a lower valve stem 34. The lower valve stem 34 is a hollow pipe. The upper part of the upper valve stem 32 is connected to the lifting mechanism 31, the lower part of the upper valve stem 32 is connected to the upper part of the connecting frame 33, the lower part of the connecting frame 33 is connected to the upper part of the lower valve stem 34, and the lower part of the lower valve stem 34 is fixedly connected to the second support seat 23.

[0117] The connecting frame 33 is a three-layer structure, each layer has a support plate, the upper, middle and lower three layers are support plate 1 331, support plate 2 332, and support plate 3 333 respectively, and support plate 1 331 and support plate 2 332, as well as support plate 2 332 and support plate 3 333 are fixedly supported by pull rods 334, the pilot mechanism 51 is fixed on the upper surface of support plate 2 332, the pilot mechanism 51 is fixedly connected to the upper end of the pilot valve stem 52, the upper part of support plate 1 331 is fixedly connected to the upper valve stem 32, the pilot mechanism 51 is fixed on the upper surface of support plate 2 332, the pilot valve stem 52 passes through support plate 3 333, the upper surface of support plate 1 331 is fixedly connected to the upper valve stem 32, the support plate 3 333 is fixedly connected to the lower valve stem 34, and the lower valve stem 34 is tubular.

[0118] A pilot valve stem 52 is arranged below the pilot mechanism 51. The pilot valve stem 52 passes through the lower valve stem 34 and the second support seat 23 and is connected to the pilot valve plug 53. A guide sleeve 6 is arranged between the lower end of the lower valve stem 34 and the pilot valve stem 52. The pilot valve plug 53 is connected to the pilot valve stem 52 by the cooperation of a pin and a hole, specifically a straight hole and a straight rod type connection.

[0119] A pilot valve seat 211 is provided at the center of the valve core end cover 21, and the pilot valve seat 211 is a hollow structure. A pilot valve core 212 is provided on the pilot valve seat 211. The pilot valve core 212 is sealed and connected with the pilot valve seat 211 in an interference fit, and the sealing surface of the pilot valve plug 53 and the sealing surface of the pilot valve core 212 are mutually matched sealing surfaces, and the sealing surface of the pilot valve core 212 is a hollow conical surface.

[0120] The pilot valve core 212 is made of hard alloy or a material with high surface hardness.

[0121] A sealing valve guide seat 41 is provided in the central part between the annular inner walls of the liquid seal groove 4, a guide hole 42 is provided in the middle of the guide seat 41, the guide seat 41 is fixedly connected to the annular inner wall of the liquid seal groove 4 by connecting ribs, a hollow guide tube 213 is provided at the bottom of the pilot valve seat 211, and is fixedly connected to the end cover 21. The outer diameter of the guide tube 213 is clearance-matched with the guide hole 42. The axes of the lower valve stem 34, the pilot valve plug 53, the guide hole 42 and the guide tube 213 of the lifting system coincide.

[0122] The sealing surface of the pilot valve plug 53 may also be a part of a spherical surface, forming an annular line seal with the sealing surface of the pilot valve core 212 .

[0123] Example 2

[0124] Combination Figure 3To explain, different from the first embodiment, the pilot valve plug 53 and the lower end of the pilot valve stem 52 are connected by a ball head and a ball socket, so that the pilot valve plug 53 can have a swing angle of 0 to 10 degrees, so as to compensate for the possible error between the pilot valve plug 53 and the pilot valve core 212, so that the pilot seal is more reliable. The pilot valve plug 53 is hemispherical, and forms an annular line seal with the sealing surface of the pilot valve core 212, so that the axial cross-sectional structure of the sealing surface of the pilot valve core 212 and the axial cross-sectional structure of the sealing surface of the pilot valve plug 53 are both part of the spherical surface.

[0125] Example 3

[0126] like Figure 4 As shown, different from Example 2, the top surface of the pilot valve core 212 is a knife-edge annular protrusion, and the bottom sealing surface of the pilot valve plug 53 is a plane. When the bottom sealing surface of the pilot valve plug 53 and the top surface of the pilot valve core 212 are in close contact, the combined sealing surface is an annular plane, and the width of this ring is 0.5 mm.

[0127] Working principle:

[0128] Taking Example 1 as an example, when the pilot pressure equalizing sealing valve is Figure 1 When the closed state is turned to the open state, the cylinder of the pilot mechanism 51 is first opened, and the cylinder pulls the pilot valve stem 52 up, and the pilot valve plug 53 is lifted up together with the pilot valve stem 52, and the pilot valve plug 53 is separated from the pilot valve seat 211, so that the air inlet chamber 11 and the air outlet chamber 12 are connected, and the gas pressure of the air inlet chamber 11 and the air outlet chamber 12 approach or even become equal, that is, the pressure difference between the air inlet chamber 11 and the air outlet chamber 12 becomes gradually reduced or even zero, and then the lifting mechanism 31 of the sealing valve is opened, and under the drive of the power mechanism 37, the valve core 2 is lifted up, and the lifting of the valve core 2 causes the valve core 2 to gradually separate from the liquid sealing groove 4, and the air inlet chamber 11 and the air outlet chamber 12 are connected as a whole, and the maximum amount of gas can pass through, and the pilot equalizing pressure sealing valve is in an open state.

[0129] When the pilot pressure-equalizing sealing valve turns from an open state to a closed state, the pilot mechanism 51 is kept in an open state. When the pilot pressure-equalizing sealing valve is completely closed, the pilot valve stem 52 moves downward, and the pilot valve plug 53 moves downward together with the pilot valve stem 52. The pilot valve plug 53 is tightly connected to the pilot valve seat 211 through the pilot valve core 212, so that the air inlet chamber 11 and the air outlet chamber 12 are in a non-connected state.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A pilot pressure equalizing sealing valve, characterized in that: It comprises a valve body (1), a valve core (2), a lifting system (3) and a pilot system (5); The lifting system (3) is arranged on the valve body (1), and the output end of the lifting system (3) is connected to the valve core (2); the pilot system (5) is arranged on the output end of the lifting system (3), and the output end of the lifting system (3) is used to control the lifting and lowering of the valve core (2) and drive the pilot system (5) to lift and lower together with the valve core (2); The valve body (1) comprises an air inlet chamber (11) and an air outlet chamber (12) respectively located on both sides of the valve core (2); a pilot valve seat (211) for connecting the air inlet chamber (11) and the air outlet chamber (12) is provided at the top end of the valve core (2); The output end of the pilot system (5) is provided with a pilot valve plug (53) for controlling the lifting and lowering of the pilot valve plug (53); the pilot valve plug (53) cooperates with the pilot valve seat (211) to control the connection state between the air inlet chamber (11) and the air outlet chamber (12).

2. The pilot pressure equalizing sealing valve according to claim 1, characterized in that: The pilot system (5) comprises a pilot mechanism (51) and a pilot valve stem (52); The pilot mechanism (51) is arranged on the lifting system (3) and is used to control the extension and retraction of the pilot valve stem (52); One end of the pilot valve stem (52) is connected to the output end of the pilot mechanism (51), and the other end is connected to the pilot valve plug (53).

3. The pilot pressure equalizing sealing valve according to claim 2, characterized in that: The pilot valve stem (52) is connected to the straight hole on the pilot valve plug (53) through a straight rod, or the pilot valve stem (52) is connected to the ball socket on the pilot valve plug (53) through a ball head.

4. The pilot pressure equalizing sealing valve according to claim 1, characterized in that: The pilot valve seat (211) further comprises a pilot valve core (212) arranged inside the pilot valve seat (211), and the pilot valve core (212) cooperates with the pilot valve plug (53) to seal the pilot valve seat (211).

5. The pilot pressure equalizing sealing valve according to claim 4, characterized in that: The size of the sealing surface of the pilot valve core (212) matches the size of the sealing surface of the pilot valve plug (53); The axial cross-sections of the sealing surface of the pilot valve core (212) and the sealing surface of the pilot valve plug (53) are both conical structures, or the axial cross-sections are both part of a spherical surface, or the top of the pilot valve core (212) is a knife-edge annular protrusion; When the top end of the pilot valve core (212) is in the form of a knife-edge annular protrusion, the bottom sealing surface of the pilot valve plug (53) is a flat structure, and the width of the annular protrusion is ≤2 mm.

6. The pilot pressure equalizing sealing valve according to claim 2, characterized in that: The lifting system (3) comprises a lifting mechanism (31) and a power mechanism (37) arranged on the valve body (1); The input end of the lifting mechanism (31) is connected to the output end of the power mechanism (37), and the output end of the lifting mechanism (31) is connected to the valve core (2); The lifting system (3) further comprises a support rod (36) arranged on the valve body (1) and a support seat (35) arranged on the upper end of the support rod (36), and the lifting mechanism (31) is arranged on the support seat (35); The lifting system (3) further comprises an upper valve stem (32), a lower valve stem (34) and a connecting frame (33) for setting a pilot mechanism (51); one end of the upper valve stem (32) is connected to the output end of the lifting mechanism (31), and the other end passes through a support seat (35) and is connected to the connecting frame (33); one end of the lower valve stem (34) is connected to the connecting frame (33), and the other end passes through the top end of the valve body (1) and is connected to the top end of the valve core (2); the lower valve stem (34) is sleeved outside the pilot valve stem (52), and the lower valve stem (34) is a hollow structure; The lifting mechanism (31) comprises a nut (312) and a lead screw (311) that moves in coordination with the nut (312), and an output end of the lead screw (311) is connected to the upper valve stem (32).

7. The pilot pressure equalizing sealing valve according to claim 6, characterized in that: The connecting frame (33) includes, from top to bottom, a support plate 1 (331), a support plate 2 (332) and a support plate 3 (333), and the support plate 1 (331), the support plate 2 (332) and the support plate 3 (333) are all connected via a pull rod (334); The upper end of the support plate 1 (331) is connected to the upper valve stem (32); The pilot mechanism (51) is arranged on the second support plate (332), and one end of the pilot valve stem (52) connected to the pilot valve plug (53) passes through the second support plate (332) and the third support plate (333) in sequence to be connected to the pilot valve plug (53); The lower end of the support plate three (333) is connected to the lower valve stem (34).

8. The pilot pressure equalizing sealing valve according to any one of claims 1 to 7, characterized in that: The valve core (2) comprises an end cover (21) and an annular structure (22) arranged on the lower end surface of the end cover (21); The annular structure (22) and the liquid sealing groove (4) provided on the valve body (1) cooperate with each other to form a seal; the pilot valve seat (211) is provided on the end cover (21); The end cover (21) is provided with a second support rod (24) and a second support seat (23) arranged at the upper end of the second support rod (24); the second support seat (23) is connected to the lower valve stem (34) and is sleeved outside the pilot valve stem (52); The end cover (21) and the pilot valve seat (211) are arranged coaxially.

9. The pilot pressure equalizing sealing valve according to claim 8, characterized in that: A guide tube (213) is provided on the end cover (21) on the side facing the air inlet chamber (11), and the guide tube (213) is in communication with the pilot valve seat (211); A guide seat (41) is provided between the annular inner walls of the liquid sealing groove (4), the guide seat (41) is connected to the annular inner wall of the liquid sealing groove (4) via a connecting rib (43), a guide hole (42) is provided on the guide seat (41) and is located opposite to the guide tube (213), and the guide hole (42) is sleeved outside the guide tube (213); The guide tube (213) and the guide hole (42) cooperate with each other to guide the valve core (2) to rise and fall along the extending direction of the guide tube (213); The guide tube (213) and the guide hole (42) are clearance-matched; The lower valve stem (34), the pilot valve stem (52), the pilot valve plug (53), the guide tube (213) and the guide hole (42) are all coaxially arranged.

10. The pilot pressure equalizing sealing valve according to claim 8, characterized in that: It also includes a guide sleeve (6) arranged on the inner side of the lower end of the lower valve stem (34), wherein the guide sleeve (6) is sleeved outside the pilot valve stem (52); The inner diameter of the guide sleeve (6) matches the outer diameter of the pilot valve stem (52).

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