A soft-sealed leak-proof gate valve

Abstract

The present invention belongs to the technical field of gate valves, and in particular relates to a soft-sealed leak-proof gate valve, comprising: a valve body, a valve cavity is formed in the valve body, and flow channels connected to the valve cavity are formed on both sides of the valve cavity; a valve cover, the valve cover is arranged above the valve body; a valve stem, the valve stem extends from the upper end of the valve cover into the valve cavity of the valve body; a valve plate, the valve plate is arranged in the valve cavity and is threadedly connected to the valve stem; a soft seal, the soft seal is arranged between the valve body and the valve cover, and the valve stem passes through the middle of the soft seal; the overall sealing of the gate valve is ensured by arranging a hydraulic sealing ring.

Description

Technical Field

[0001] The invention belongs to the technical field of gate valves, and in particular relates to a soft-sealed leak-proof gate valve. Background Art

[0002] The high-pressure gate valve is a valve whose opening and closing parts move up and down along the valve seat in a straight line. The opening and closing parts of the gate valve are gate plates, and the movement direction of the gate plates is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and no adjustment or throttling is performed. The high-pressure gate valve is a forced sealing valve. In the existing manually controlled gate valves, flange connection is generally used at the joint between the valve cover and the valve body, and ordinary gaskets are used for sealing at the flange joint, which is prone to poor sealing during use; in addition, multiple bolts are required to cooperate during the connection process. Since it is impossible to ensure that the tightening degree of each bolt is consistent, it is easy to produce inconsistent connection tightness, which will cause uneven sealing during use, resulting in leakage. Summary of the invention

[0003] The purpose of the present invention is to provide a leak-proof gate valve with a simple structure and a soft seal in order to solve the above-mentioned technical problems.

[0004] In view of this, the present invention provides a soft-sealed leak-proof gate valve, comprising:

[0005] A valve body, wherein a valve cavity is formed in the valve body, and flow channels communicating with the valve cavity are formed on both sides of the valve cavity;

[0006] A valve cover, which is arranged above the valve body;

[0007] A valve stem extending from the upper end of the valve cover into the valve cavity of the valve body;

[0008] A valve plate, which is arranged in the valve cavity and is threadedly connected to the valve stem;

[0009] A soft seal is arranged between the valve body and the valve cover, and the valve stem passes through the middle of the soft seal.

[0010] In the above technical solution, further, the valve body includes:

[0011] The valve body, the valve cavity and the flow channel are formed in the valve body;

[0012] A lower extension portion, which is located above the valve body and communicates with the valve cavity;

[0013] A lower flange is formed at the upper end of the lower extension portion and is integrally formed with the lower extension portion;

[0014] The valve cover includes:

[0015] An upper flange, the upper flange abuts against the lower flange and is fixedly connected to the lower flange;

[0016] An upper extension portion, formed at an end of the lower flange away from the upper flange;

[0017] The soft seal is arranged between the upper flange and the lower flange and extends toward the inner direction of the upper extension part and the inner direction of the lower extension part on both sides respectively; and the upper flange and the lower flange are fixed by bolts and nuts.

[0018] In the above technical solution, further, the soft seal comprises:

[0019] An annular pressing ring, the annular pressing ring is pressed between the upper flange and the lower flange;

[0020] A hydraulic sealing ring is arranged on the inner side of the annular pressure ring;

[0021] An inner sealing assembly is arranged on the inner side of the hydraulic sealing ring;

[0022] The annular pressure ring is fixedly connected to the upper flange and the lower flange by bolts, and the inner side of the port of the upper flange and the port of the lower flange are both provided with a supporting edge that abuts against the inner sealing component, and the inner side of the inner sealing component is formed with a through hole that is rotatably connected to the valve stem.

[0023] In the above technical solution, further, the hydraulic sealing ring includes:

[0024] External sealing petals, the two external sealing petals are symmetrically arranged and have an L-shaped cross section;

[0025] A hydraulic sealing chamber, wherein a hydraulic sealing chamber is arranged inside the outer sealing valve and the hydraulic sealing chamber is filled with a sealing liquid;

[0026] A connecting pipe is provided between the two outer sealing petals. A plurality of connecting pipes are evenly distributed along the circumference, and both ends of the connecting pipe are connected to the hydraulic sealing chamber in the outer sealing petal on the corresponding side.

[0027] The outer sealing flap includes:

[0028] An end sealing sheet, the end sealing sheet abuts between the annular pressure ring and the upper flange or the lower flange, and the outer edge of the end sealing sheet is stepped, and a stepped groove matching the end sealing sheet is formed on the annular pressure ring; and a plurality of coaxially arranged sealing ribs are formed on the side of the end sealing sheet facing the upper flange or the lower flange;

[0029] The side sealing sheet is arranged obliquely, and an inclined portion that is inclined and matched is formed inwardly at the port of the upper flange or the lower flange, the diameter of the inclined portion decreases from the port inwardly, and a plurality of coaxially arranged sealing strips are arranged on the outer side of the side sealing sheet;

[0030] A connecting piece is integrally formed between the end sealing piece and the side sealing piece;

[0031] The hydraulic seal chamber includes:

[0032] An end sealing chamber is formed in the end sealing sheet, and a connecting pipe connects two end sealing sheets and connects the end sealing chamber;

[0033] A side sealing chamber is formed in the side sealing sheet;

[0034] A connecting capillary tube is provided in the connecting piece to connect the end sealing chamber and the side sealing chamber.

[0035] In the above technical solution, further, the hydraulic sealing ring also includes:

[0036] An inner sealing ring is provided between the two outer sealing petals and on the inner side of the connecting pipe, and an inner sealing bag is formed in the inner sealing ring;

[0037] A delivery pipe is provided inside each connecting pipe, and both ends of the delivery pipe are respectively connected to the connecting pipe and the inner sealing ring, and connect the connecting pipe and the inner sealing bag;

[0038] The inner sealing ring is located in the middle of the inner sealing assembly and abuts against the valve stem; and the inner wall of the annular pressure ring is formed with an outer groove portion that matches the connecting pipe.

[0039] In the above technical solution, further, the inner sealing component includes:

[0040] Inner annular blocks, two inner annular blocks are symmetrically arranged and are respectively arranged in the ports of the upper flange or the lower flange, and the outer walls of the inner annular blocks are inclined and in contact with the outer sealing petals on the sides;

[0041] Inner receiving rings, the two inner receiving rings are symmetrical to each other and are arranged between the two inner annular blocks, and a placement groove for placing the conveying pipe is formed on the inner receiving ring;

[0042] The outer wall of the inner annular block is in contact with the side sealing sheet and is formed with a recess for placing the side sealing sheet; the inner sealing ring is located between the two inner annular blocks, and the inner annular block is formed with a placement groove for placing the inner sealing ring; the outer wall of the inner receiving ring is formed with an inner groove portion that cooperates with the connecting pipe, and the end sealing sheet abuts against the end face of the inner receiving ring; and a protruding limiting edge is formed on the side of the inner receiving ring close to the inner annular block, and a limiting groove that cooperates with the limiting edge is formed on the inner annular block; the valve stem passes through the middle of the inner annular block and is rotatably connected.

[0043] In the above technical solution, further, the inner sealing component also includes:

[0044] Inner seal: a sealing groove is arranged on the inner side of each inner annular block, and an inner seal is arranged on the sealing groove;

[0045] The inner seal includes:

[0046] An outer sealing layer, the outer sealing layer abuts against the valve stem;

[0047] An inner sealing layer, which is integrally formed with the outer sealing layer and abuts against the bottom of the sealing groove;

[0048] A first detector, wherein an outer detection groove is provided on the outer wall of the outer sealing layer, and a first detector is provided in the outer detection groove;

[0049] The second detector is provided with an inner detection groove on the outer wall of the inner sealing layer, and the second detector is provided in the inner detection groove.

[0050] In the above technical solution, further, the soft seal also includes:

[0051] An injection hole is provided on the annular pressing ring and extends into the inner side of the annular pressing ring;

[0052] An inner extension pipe, wherein two of the connecting pipes are respectively integrally formed with an inner extension pipe connected thereto and extending into one of the injection holes;

[0053] An oil injection nozzle is provided on the injection hole and is sealed and connected to the inner extension tube;

[0054] An external plug is provided outside the oil filling nozzle;

[0055] A one-way valve assembly is arranged in the oil filling nozzle.

[0056] In the above technical solution, further, it also includes:

[0057] a pressure balancing assembly connected to one of the oiling nozzles;

[0058] The pressure balance components include:

[0059] A pressure supplement pipe, one end of which is connected to the injection hole;

[0060] A pressure detector is provided in the middle of the pressure supplement pipe;

[0061] A pressure supplementer is connected to the other end of the pressure supplement pipe.

[0062] In the above technical solution, further, the pressure supplementer includes:

[0063] An outer shell, the outer contour of which is stepped, and comprises a first shell and a second shell with decreasing diameters, the first shell being arranged toward the pressure supplement pipe;

[0064] Connecting plates, which are arranged at both ends of the outer shell and extend outwardly;

[0065] End cover plates, both ends of the connection plates are provided with end cover plates that close the outer shell, and one of the end cover plates is connected to the pressure supplement pipe;

[0066] A pressure regulating core is provided in the outer shell and can slide freely;

[0067] An external pressure regulating rod is provided on an end cover plate away from the pressure supplement pipe, and extends into the inner side of the end cover plate and abuts against the pressure regulating core;

[0068] The pressure regulating core includes:

[0069] An inner core body, the inner core body is slidably matched with the inner wall of the first shell;

[0070] An outer core body, the outer core body and the inner wall of the second shell body are slidably matched;

[0071] A support core is coaxially arranged between the inner core body and the outer core body and serves as a support;

[0072] Sealing rings are arranged on the outer walls of the inner core body and the outer core body.

[0073] The beneficial effects of the present invention are:

[0074] 1. The sealing performance of the connection between the upper flange and the lower flange is ensured by setting a hydraulic sealing ring;

[0075] 2. The hydraulic pressure in the hydraulic sealing ring is adjusted by setting the hydraulic sealing ring to ensure the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 It is a schematic diagram of the structure of the present invention;

[0077] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0078] Figure 3 It is a structural schematic diagram of the hydraulic sealing ring in the present invention;

[0079] Figure 4 yes Figure 2 Schematic diagram of the cross section at point Ⅰ;

[0080] Figure 5 The structure diagram of the pressure balance assembly in the present invention;

[0081] The markings in the figure are as follows: 1-valve stem, 2-valve plate, 3-valve body, 4-lower extension, 5-lower flange, 6-upper flange, 7-upper extension, 8-external sealing flap, 8a-end sealing plate, 8b-sealing rib, 8c-side sealing plate, 8d-sealing strip, 8e-connecting plate, 9-hydraulic sealing chamber, 9a-end sealing chamber, 9b-side sealing chamber, 9c-connecting capillary, 10-connecting pipe, 11-annular pressure ring, 12-inner sealing ring, 13-inner sealing bag, 14-delivery pipe, 15-inner annular block, 16-inner receiving ring, 16a-limiting edge, 17-inner sealing member, 17a-outer sealing layer, 17b-inner sealing layer, 17c-first detector, 17d-second detector, 18-injection hole, 19-inner extension tube, 20-oil filling nozzle, 21-pressure replenishing tube, 22-pressure detector, 23-outer shell, 24-pressure regulating core, 24a-inner core, 24b-outer core, 24c-support core, 24d-sealing ring, 25-outer pressure regulating rod. DETAILED DESCRIPTION

[0082] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0083] Embodiment 1:

[0084] This embodiment provides a soft-sealed anti-leakage gate valve, comprising:

[0085] A valve body, wherein a valve cavity is formed in the valve body, and flow channels communicating with the valve cavity are formed on both sides of the valve cavity;

[0086] A valve cover, which is arranged above the valve body;

[0087] A valve stem 1 extends from the upper end of the valve cover into the valve cavity of the valve body;

[0088] A valve plate 2, which is arranged in the valve cavity and is threadedly connected to the valve stem 1;

[0089] A soft seal is arranged between the valve body and the valve cover, and the valve stem 1 passes through the middle of the soft seal.

[0090] In this embodiment, a soft seal is used instead of a traditional gasket, thereby ensuring the sealing effect between the valve cover and the valve body, thereby ensuring that the gate valve plays a good conduction or cutoff role in the high-pressure pipeline.

[0091] Embodiment 2:

[0092] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0093] The valve body includes:

[0094] A valve body 3, a valve cavity and a flow channel are formed in the valve body 3;

[0095] A lower extension portion 4, which is located above the valve body 3 and communicates with the valve cavity;

[0096] A lower flange 5 is formed at the upper end of the lower extension portion 4 and is integrally formed with the lower extension portion 4;

[0097] The valve cover includes:

[0098] An upper flange 6, the upper flange 6 abuts against the lower flange 5 and is fixedly connected to the lower flange 5;

[0099] An upper extension portion 7, wherein the upper extension portion 7 is formed at one end of the lower flange 5 away from the upper flange 6;

[0100] The soft seal is arranged between the upper flange 6 and the lower flange 5 and extends toward the upper extension part 7 and the lower extension part 4 on both sides respectively; and the upper flange 6 and the lower flange 5 are fixed by bolts and nuts.

[0101] In this embodiment, the lower extension portion 4 is integrally formed with the valve body 3, and is used to increase the space for accommodating the valve stem 1, and also provides a good space for the valve plate 2 to move upward, and the lower flange 5 is integrally formed with the lower extension portion 4, and is used for installing and fixing the valve cover; the upper extension portion 7 is integrally formed with the upper flange 6, and the upper flange 6 can facilitate the installation of the valve cover, and the soft seal is arranged between the upper flange 6 and the lower flange 5 so as to achieve a good sealing effect, and the soft seal extends to the upper extension portion 7 and the lower extension portion 4 through the soft seal, so as to further achieve the effect of sealing and leak-proofing.

[0102] Embodiment 3:

[0103] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0104] Soft seals include:

[0105] An annular pressing ring 11, the annular pressing ring 11 is pressed between the upper flange 6 and the lower flange 5;

[0106] A hydraulic sealing ring is provided on the inner side of the annular pressure ring 11;

[0107] An inner sealing assembly is arranged on the inner side of the hydraulic sealing ring;

[0108] The annular pressure ring 11 is fixedly connected to the upper flange 6 and the lower flange 5 by bolts, and the inner side of the port of the upper flange 6 and the port of the lower flange 5 are provided with a supporting edge that abuts against the inner sealing component, and the inner side of the inner sealing component is formed with a through hole that is rotatably connected to the valve stem 1.

[0109] In this embodiment, the annular pressure ring 11 is made of plastic alloy and is against the upper flange 6 and the lower flange 5, which ensures the strength of the annular pressure ring 11 supported between the upper flange 6 and the lower flange 5, and can achieve a preliminary sealing effect; the hydraulic sealing ring is arranged on the inner side of the annular pressure ring 11 and is between the upper flange 6 and the lower flange 5, so as to improve the overall sealing performance of the soft seal; the arrangement of the inner sealing assembly not only plays a supporting effect on the inner side of the hydraulic sealing ring, but also improves the sealing of the soft seal; and the annular pressure ring 11 is fixed by bolts, which can not only improve the stability of the installation of the annular pressure ring 11, but also facilitate the later maintenance of the gate valve; and the inner side of the port of the upper flange 6 and the port of the lower flange 5 are provided with a supporting edge that is against the inner sealing assembly, thereby limiting the inner sealing assembly to prevent the displacement of the inner sealing assembly, thereby ensuring the overall sealing.

[0110] Embodiment 4:

[0111] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0112] Hydraulic sealing rings include:

[0113] The two outer sealing petals 8 are symmetrically arranged and have an L-shaped cross section;

[0114] A hydraulic sealing chamber 9 is provided inside the outer sealing petal 8, and the hydraulic sealing chamber 9 is filled with a sealing liquid;

[0115] A connecting pipe 10, wherein a plurality of connecting pipes 10 evenly distributed along the circumference are provided between the two outer sealing petals 8, and both ends of the connecting pipe 10 are connected to the hydraulic sealing chamber 9 in the outer sealing petal 8 on the side where the connecting pipe 10 is located;

[0116] The outer sealing flap 8 comprises:

[0117] The end sealing piece 8a is abutted between the annular pressure ring 11 and the upper flange 6 or the lower flange 5, and the outer edge of the end sealing piece 8a is stepped, and a stepped groove matching the end sealing piece 8a is formed on the annular pressure ring 11; and a plurality of coaxially arranged sealing ribs 8b are formed on the side of the end sealing piece 8a facing the upper flange 6 or the lower flange 5;

[0118] The side sealing sheet 8c is arranged obliquely, and an inclined portion that is inclined and matched is formed inwardly at the port of the upper flange 6 or the lower flange 5, and the diameter of the inclined portion decreases from the port to the inside, and a plurality of coaxially arranged sealing strips 8d are arranged on the outside of the side sealing sheet 8c;

[0119] A connecting piece 8e is formed integrally between the end sealing piece 8a and the side sealing piece 8c;

[0120] The hydraulic sealing chamber 9 comprises:

[0121] An end sealing chamber 9a is formed in the end sealing sheet 8a, and a connecting pipe 10 connects the two end sealing sheets 8a and communicates with the end sealing chamber 9a;

[0122] A side sealing chamber 9b, wherein the side sealing chamber 9b is formed in the side sealing sheet 8c;

[0123] A connecting capillary tube 9c is provided in the connecting piece 8e to connect the end sealing chamber 9a and the side sealing chamber 9b.

[0124] In this embodiment, the hydraulic sealing ring is made of a highly elastic material as a whole; the outer sealing petal 8 has a good sealing effect between the upper flange 6 and the lower flange 5, and the hydraulic sealing chamber 9 is formed in the outer sealing petal 8. By filling the sealing liquid into the hydraulic sealing chamber 9, the overall saturation of the outer sealing petal 8 is adjusted, and then the fit between the outer sealing petal 8 and the upper flange 6 and the lower flange 5 is adjusted; and the connecting pipe 10 not only connects the two outer sealing petals 8, but also connects the hydraulic sealing chambers 9 in the two outer sealing petals 8, thereby facilitating the filling of the sealing liquid and facilitating the discharge of air in the hydraulic sealing chamber 9.

[0125] The end sealing piece 8a in the outer sealing flap 8 has a good sealing effect between the annular pressure ring 11 and the upper flange 6 or the lower flange 5, and the step groove on the annular pressure ring 11 cooperates with the step-shaped structure of the outer edge of the end sealing piece 8a to facilitate the placement of the end sealing piece 8a and improve the sealing effect of the end sealing piece 8a in contact with the annular pressure ring 11, and a plurality of coaxially arranged sealing ribs 8b are arranged on the end sealing piece 8a to further ensure the sealing effect of the end sealing piece 8a in contact with the upper flange 6 or the lower flange 5; and the side sealing piece 8c is arranged to improve the sealing of the connection between the upper flange 6 and the upper extension 7 or the lower flange 5 and the lower extension 4, and the sealing performance can be improved by the inclined side sealing piece 8c, and the sealing strip 8d arranged on the outer side of the side sealing piece 8c can improve the sealing of the connection between the side sealing piece 8c and the upper flange 6 or the lower flange 5. The connecting piece 8e is used to connect the end sealing piece 8a and the side sealing piece 8c.

[0126] The end sealing chamber 9a in the hydraulic sealing chamber 9 is arranged in the end sealing plate 8a. By inputting sealing liquid into the end sealing chamber 9a, the end sealing plate 8a is filled, thereby ensuring that the end sealing plate 8a can better contact with the annular pressure ring 11 and the lower flange 5 or the upper flange 6; and the side sealing cavity is formed in the side sealing plate 8c, thereby further improving the sealing effect of the side sealing plate 8c. At the same time, the side sealing chamber 9b is connected to the end sealing chamber 9a by setting a connecting capillary, thereby facilitating the injection of sealing liquid and the discharge of air.

[0127] Embodiment 5:

[0128] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0129] The hydraulic sealing ring also includes:

[0130] An inner sealing ring 12 is provided between the two outer sealing petals 8 and on the inner side of the connecting pipe 10. An inner sealing bag 13 is formed in the inner sealing ring 12.

[0131] A delivery pipe 14 is provided inside each connecting pipe 10, and both ends of the delivery pipe 14 are respectively connected to the connecting pipe 10 and the inner sealing ring 12, and connect the connecting pipe 10 with the inner sealing bag 13;

[0132] The inner sealing ring 12 is located in the middle of the inner sealing assembly and abuts against the valve stem 1 ; and the inner wall of the annular pressure ring 11 is formed with an outer groove portion that matches the connecting pipe 10 .

[0133] In this embodiment, the provision of the inner sealing ring 12 can improve the sealing effect of the contact between the hydraulic sealing ring and the valve stem 1; the delivery pipe 14 is used to connect the inner sealing ring 12 and the connecting pipe 10, and can connect the inner sealing bag 13 and the connecting pipe 10; thereby ensuring a good sealing effect; and the outer groove formed on the inner wall of the annular pressure ring 11 can support and limit the hydraulic sealing ring.

[0134] Embodiment 6:

[0135] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0136] The inner seal assembly includes:

[0137] Inner annular blocks, two inner annular blocks are symmetrically arranged and are respectively arranged in the ports of the upper flange 6 or the lower flange 5, and the outer walls of the inner annular blocks are inclined and in contact with the outer sealing petal 8 on the side;

[0138] Inner receiving ring 16, two inner receiving rings 16 are symmetrical to each other and are arranged between two inner annular blocks, and a placement groove for placing the delivery pipe 14 is formed on the inner receiving ring 16;

[0139] The outer wall of the inner annular block is in contact with the side sealing sheet 8c, and a recess is formed for accommodating the side sealing sheet 8c; the inner sealing ring 12 is located between the two inner annular blocks, and a placement groove is formed on the inner annular block for accommodating the inner sealing ring 12; the outer wall of the inner receiving ring 16 is formed with an inner groove portion cooperating with the connecting pipe 10, and the end sealing sheet 8a is abutted against the end face of the inner receiving ring 16; and a protruding limiting edge 16a is formed on the side of the inner receiving ring 16 close to the inner annular block, and a limiting groove cooperating with the limiting edge 16a is formed on the inner annular block; the valve stem 1 passes through the middle of the inner annular block and is rotatably connected.

[0140] In this embodiment, the inner annular block can not only support the valve stem 1, but also seal the position of the valve stem 1 on the upper side of the lower extension 4. The outer wall of the inner annular block is in contact with the side sealing sheet 8c in the outer sealing flap 8, thereby limiting the side sealing sheet 8c and strengthening the sealing effect between the valve stem 1 and the upper flange 6 or the lower flange 5. The inner receiving ring 16 can support the inner side of the end sealing sheet 8a and prevent the inner annular block from floating too much in the axial direction. At the same time, the outer wall of the inner annular block is inclined, which can ensure a good sealing effect when the inner annular block floats in the axial direction.

[0141] Embodiment 7:

[0142] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0143] The inner seal assembly also includes:

[0144] Inner seal 17, a sealing groove is provided on the inner side of each inner annular block, and the inner seal 17 is provided on the sealing groove;

[0145] The inner seal 17 comprises:

[0146] An outer sealing layer 17a, the outer sealing layer 17a abuts against the valve stem 1;

[0147] An inner sealing layer 17b, which is integrally formed with the outer sealing layer 17a and abuts against the bottom of the sealing groove;

[0148] A first detector 17c, an outer detection groove is provided on the outer wall of the outer sealing layer 17a, and the first detector 17c is provided in the outer detection groove;

[0149] The second detector 17d is provided with an inner detection groove on the outer wall of the inner sealing layer 17b, and the second detector 17d is provided in the inner detection groove.

[0150] In this embodiment, the setting of the inner seal 17 can improve the sealing effect of the inner annular blocks on both sides in contact with the valve stem 1; the outer sealing layer 17a in the inner seal 17 is made of elastic sealing material, thereby ensuring the sealing effect; the inner sealing layer 17b is made of hard material, thereby providing a good supporting effect. The gate valve is also provided with an external control box, which has alarms of different colors on the outside of the control box, and a controller and a control circuit inside the control box, wherein a first detector 17c detects the real-time position between the outer wall of the outer sealing layer 17a and the valve stem 1, and an initial position of the outer wall of the outer sealing layer 17a and the outer wall of the valve stem 1 when they are first assembled is provided in the controller, when the difference between the real-time position and the initial position is greater than or equal to 1 mm, it is judged that the outer sealing layer 17a has been worn out and failed, and an alarm is issued through the control box; and the second detector 17d is used to detect the real-time distance between the inner wall of the inner sealing layer 17b and the inner wall of the inner detection groove, and an initial position of the inner sealing layer 17b and the inner wall of the inner detection groove when they are first assembled is provided in the controller, when the difference between the real-time position and the initial position is greater than or equal to 1 mm, it is judged that the inner sealing layer 17b has been worn out and failed, and an alarm is issued through the control box.

[0151] Embodiment 8:

[0152] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0153] Soft seals also include:

[0154] An injection hole 18 is provided on the annular pressing ring 11 and extends into the inner side of the annular pressing ring 11;

[0155] An inner extension pipe 19, wherein two connecting pipes 10 are respectively integrally formed with an inner extension pipe 19 connected thereto and extending into one of the injection holes 18;

[0156] A grease injection nozzle 20 is provided on the injection hole 18 and the grease injection nozzle 20 is sealed and connected to the inner extension tube 19;

[0157] An external plug is provided outside the oiling nozzle 20;

[0158] A one-way valve assembly is arranged in the oil filling nozzle 20 .

[0159] In this embodiment, the annular pressure ring 11 is provided with two injection holes 18, one of which is used to inject the sealing liquid, and the other is used to exhaust when injecting the sealing liquid; the inner extension tube 19 is provided to facilitate the injection of the sealing liquid; the oiling nozzle 20 is provided to facilitate the filling of the sealing liquid, and the outer sealing cover can block the oiling nozzle 20. The sealing liquid can be a low-temperature resistant lubricating liquid.

[0160] Embodiment 9:

[0161] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0162] Also includes:

[0163] A pressure balancing assembly connected to one of the oiling nozzles 20;

[0164] The pressure balance components include:

[0165] A pressure replenishing pipe 21, one end of which is connected to the injection hole 18;

[0166] A pressure detector 22 is provided in the middle of the pressure replenishing pipe 21;

[0167] A pressure supplementer is connected to the other end of the pressure supplementer pipe 21 .

[0168] In this embodiment, if a pressure balancing component is provided, the oil filling nozzle 20 adopts a structure without a one-way valve; the hydraulic pressure in the hydraulic sealing chamber 9 is adjusted by the pressure balancing component to ensure the overall sealing effect of the hydraulic sealing ring; the pressure replenishing pipe 21 facilitates the connection between the pressure replenisher and the injection hole 18, and the pressure detector 22 is used to detect and display the hydraulic pressure of the pressure replenishing pipe 21 and the hydraulic sealing chamber 9, thereby facilitating the adjustment and replenishment of pressure.

[0169] Embodiment 10:

[0170] This embodiment provides a soft-sealed leak-proof gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0171] The pressure booster includes:

[0172] The outer shell 23 has a stepped outer profile and includes a first shell and a second shell with decreasing diameters, and the first shell is arranged toward the pressure replenishing pipe 21;

[0173] Connecting plates, which are provided at both ends of the outer shell 23 and extend outward;

[0174] End cover plates, on the connecting plates at both ends, end cover plates for closing the outer shell 23 are arranged, and one of the end cover plates is connected to the pressure supplement pipe 21;

[0175] A pressure regulating core 24 is provided in the outer shell 23 and is freely slidable;

[0176] An external pressure regulating rod 25 is provided on an end cover plate away from the pressure supplementing pipe 21, and extends into the inner side of the end cover plate and abuts against the pressure regulating core 24;

[0177] The pressure regulating core 24 includes:

[0178] An inner core 24a, the inner core 24a is slidably matched with the inner wall of the first shell;

[0179] An outer core 24b, the outer core 24b is slidably matched with the inner wall of the second shell;

[0180] A support core 24c is coaxially arranged between the inner core 24a and the outer core 24b and serves as a support;

[0181] Sealing rings 24d are provided on the outer walls of the inner core 24a and the outer core 24b.

[0182] In this embodiment, the outer shell 23 is used to accommodate the pressure regulating core 24, the connecting plate and the end cover plate are used to seal the outer shell 23, and the outer shell 23 is filled with sealing liquid. The position of the pressure regulating valve core is adjusted by the external adjusting rod to adjust the hydraulic pressure in the pressure replenishing pipe 21 and the hydraulic sealing chamber 9. When the pressure is too low, it can be adjusted in time to ensure the seal, thereby further ensuring the sealing effect of the gate valve; and the pressure regulating valve core can improve the pressure regulation effect through the double-core structure, and the sealing of the contact between the core and the inner wall of the outer shell 23 can be ensured by the setting of the sealing ring 24d.

[0183] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A soft-sealed leak-proof gate valve, characterized in that: include: A valve body, wherein a valve cavity is formed in the valve body; A valve cover, wherein the valve cover is arranged above the valve body; A valve stem (1), wherein the valve stem (1) extends from an upper end of the valve cover into a valve cavity of the valve body; A valve plate (2), wherein the valve plate (2) is arranged in the valve cavity and is threadedly connected to the valve stem (1); A soft seal, wherein the soft seal is arranged between the valve body and the valve cover, and the valve stem (1) passes through the middle of the soft seal; The valve body comprises: a valve body (3), a lower extension portion (4) and a lower flange (5); The valve cover comprises: an upper flange (6) and an upper extension portion (7); The soft seal comprises: An annular pressing ring (11), wherein the annular pressing ring (11) is abutted between the upper flange (6) and the lower flange (5); A hydraulic sealing ring is provided on the inner side of the annular pressure ring (11); An inner sealing component is arranged on the inner side of the hydraulic sealing ring; The annular pressure ring (11) is fixedly connected to the upper flange (6) and the lower flange (5) by bolts, and the inner side of the port of the upper flange (6) and the inner side of the port of the lower flange (5) are provided with a support edge that abuts against the inner sealing component, and the inner side of the inner sealing component is formed with a through hole that is rotatably connected to the valve stem (1); The hydraulic sealing ring comprises: External sealing flaps (8), the two external sealing flaps (8) being symmetrically arranged with respect to each other and having an L-shaped cross section; A hydraulic sealing chamber (9), wherein the hydraulic sealing chamber (9) is arranged inside the outer sealing flap (8), and the hydraulic sealing chamber (9) is filled with a sealing liquid; A connecting pipe (10), wherein a plurality of connecting pipes (10) are arranged between the two outer sealing flaps (8) and are evenly distributed along the circumference, and both ends of the connecting pipe (10) are connected to the hydraulic sealing chamber (9) in the outer sealing flap (8) on the corresponding side; An inner sealing ring (12), wherein an annular inner sealing ring (12) is disposed between the two outer sealing petals (8) and located on the inner side of the connecting pipe (10), and an inner sealing bag (13) is formed inside the inner sealing ring (12); A delivery pipe (14), wherein a delivery pipe (14) is provided on the inner side of each of the connecting pipes (10), and both ends of the delivery pipe (14) are respectively connected to the connecting pipe (10) and the inner sealing ring (12), and connect the connecting pipe (10) and the inner sealing bag (13); The inner sealing ring (12) is located in the middle of the inner sealing assembly and abuts against the valve stem (1); and the inner wall of the annular pressure ring (11) is formed with an outer groove portion that cooperates with the connecting pipe (10).

2. A soft-sealed anti-leakage gate valve according to claim 1, characterized in that: The inner sealing assembly comprises: Inner annular blocks (15), wherein the two inner annular blocks (15) are symmetrically arranged with respect to each other; Inner receiving rings (16), the two inner receiving rings (16) are symmetrical to each other and are arranged between the two inner annular blocks (15), and a placement groove for placing the conveying pipe (14) is formed on the inner receiving ring (16).

3. A soft-sealed anti-leakage gate valve according to claim 2, characterized in that: The inner sealing assembly further comprises: An inner seal (17), wherein a sealing groove is provided on the inner side of each inner annular block (15), and the inner seal (17) is provided on the sealing groove; The inner seal (17) comprises: An outer sealing layer (17a), wherein the outer sealing layer (17a) abuts against the valve stem (1); An inner sealing layer (17b), wherein the inner sealing layer (17b) is integrally formed with the outer sealing layer (17a) and abuts against the bottom of the sealing groove.

4. A soft-sealed anti-leakage gate valve according to claim 3, characterized in that: The soft seal also includes: An injection hole (18), wherein the annular pressing ring (11) is provided with an injection hole (18) extending into the inner side of the annular pressing ring (11); An inner extension tube (19) is integrally formed on the connecting tube (10) and is connected to the connecting tube (10) and extends into the injection hole (18); An oil injection nozzle (20), the oil injection nozzle (20) is provided on the injection hole (18) and the oil injection nozzle (20) is sealedly connected to the inner extension tube (19); An external plug is provided outside the oil filling nozzle (20); A one-way valve assembly is provided in the oil filling nozzle (20).

5. A soft-sealed anti-leakage gate valve according to claim 4, characterized in that: Also includes: A pressure balancing assembly, wherein the pressure balancing assembly is connected to the oiling nozzle (20); The pressure balancing assembly includes: a pressure replenishing pipe (21), one end of the pressure replenishing pipe (21) being connected to the injection hole (18); A pressure detector (22), wherein the pressure detector (22) is arranged in the middle of the pressure replenishing pipe (21); A pressure supplementer is connected to the other end of the pressure supplement pipe (21).

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