CN112268123A

CN112268123A - Bidirectional sealing gate valve

Info

Publication number: CN112268123A
Application number: CN202011162417.XA
Authority: CN
Inventors: 陈思良; 谢洪文; 张书恩; 卢爱山; 陈超群
Original assignee: Huhang Technology Group Co ltd
Current assignee: Huhang Technology Group Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-01-26

Abstract

The invention relates to the field of gate valves, in particular to a bidirectional sealing gate valve which comprises a valve body, a valve cover, a gate plate assembly, a valve rod and a hand wheel, wherein the valve cover is installed at the top of the valve body through bolts, the valve body is provided with a feeding port and a discharging port which are coaxially arranged, a flow channel is arranged between the feeding port and the discharging port, the gate plate assembly is arranged in the flow channel, a gate plate groove is formed in the bottom of the flow channel, the lower end of the valve rod penetrates into the valve body from the valve cover and is connected with the gate plate assembly, the upper end of the valve rod is connected with the hand wheel, the gate plate assembly comprises a guide block, a left gate plate assembly and a right gate plate assembly, the left gate plate assembly and the right gate plate assembly are arranged on two sides of the guide block, the left gate plate assembly and the right gate plate. It has mainly been solved among the prior art gate valve and has not been applicable to the medium that carries solid particle impurity, causes the poor problem of sealed effect.

Description

Bidirectional sealing gate valve

Technical Field

The invention relates to the field of gate valves, in particular to a bidirectional sealing gate valve.

Background

In industrial production, the pressure, flow direction and the like of the medium in the pipeline can change along with production working conditions, and the conditions that the flow direction and the high-pressure side and the low-pressure side of the medium in the pipeline are opposite under different working conditions often occur. And the ordinary gate valve often only has one side to be equipped with sealed face, can only bear corresponding one side high pressure, becomes the opposite side when the high-pressure side, and sealed effect weakens greatly, probably produces the leakage, influences production and even causes the incident. If 2 gate valves are installed oppositely, although bidirectional sealing can be realized, equipment investment is increased, control is complex, and reliability is low.

The prior patent publication No. CN109114241A discloses a bidirectional sealing gate valve with double valve plates, which comprises a valve body, wherein the valve body is provided with a valve chamber and is connected with an actuating mechanism, two valve seats are oppositely arranged on the valve body, two valve plates and two groups of wedge-shaped structures are correspondingly arranged in the valve chamber, the inclined plane of each group of wedge-shaped structures is opposite to the corresponding valve seat so as to form a wedge-shaped space in an enclosing manner, and sliding blocks matched with the inclined planes of the corresponding wedge-shaped structures are arranged on the non-sealing plate surfaces of the two valve plates; thereby two valve plates all are connected with actuating mechanism and all have open valve state and close the valve state, and under the close valve state, the valve plate laminates with the disk seat that corresponds and slider and the inclined plane butt of wedge structure that corresponds, and under the open valve state, the valve plate is separated with the disk seat that corresponds. It is through the two-way seal gate valve of two valve plates in area that provides, through two valve plates respectively with the sealed face laminating of two disk seats of valve body, realize two-way seal, it is sealed more reliable, sealed effect preferred. But it is only suitable for the circulation of the medium or gaseous medium that does not contain the impurity, if mix with solid particle in the medium, will have some solid particle to pile up to the valve body bottom in the circulation, causes the connection of valve body and valve plate not inseparable, and sealed effect is poor.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides a bidirectional sealing gate valve, which mainly solves the problem that the gate valve in the prior art is not suitable for conveying media containing solid particle impurities, resulting in poor sealing effect.

In order to achieve the purpose, the invention adopts the following technical scheme: a bidirectional sealing gate valve comprises a valve body, a valve cover, a gate plate assembly, a valve rod and a hand wheel, wherein the valve cover is installed at the top of the valve body through bolts, the valve body is provided with a feeding port and a discharging port which are coaxially arranged, a flow channel for medium circulation is arranged between the feeding port and the discharging port, the gate plate assembly is arranged in the flow channel, a gate plate groove is arranged at the bottom of the flow channel, the lower end of the valve rod penetrates into the valve body from the valve cover and is connected with the gate plate assembly, the upper end of the valve rod is connected with the hand wheel, the flowing direction of a medium is defined to be left and right, and,

the gate plate component comprises a guide block arranged in the valve body, and a left gate plate component and a right gate plate component which are arranged on the left side and the right side of the guide block, wherein the inner wall of the valve body is provided with limiting strips on the front side and the rear side of the guide block, the front side and the rear side of the guide block are respectively provided with a limiting groove, the limiting strips extend into the limiting grooves, so that the guide block can move up and down along the limiting strips, the upper end of the guide block protrudes upwards to form a guide post, the guide post is provided with a guide groove, internal threads are arranged in the guide groove, the lower end of the valve rod is spirally arranged in the guide groove, the upper end of the valve cover is provided with an extension sleeve, the guide post penetrates through the valve cover to extend into the extension sleeve and moves up and down along the valve cover along with the guide block,

the left side surface and the right side surface of the guide block are wedge-shaped surfaces, the left flashboard assembly and the right flashboard assembly respectively comprise flashboards which are arranged in parallel with the respective corresponding wedge-shaped surfaces, the flashboards can move relative to the guide block at least through a group of elastic assemblies, a limiting sealing assembly is arranged between the periphery of each flashboard and the guide block,

the gate plate tank is internally provided with an elastic baffle plate assembly, the elastic baffle plate assembly comprises an elastic part fixedly arranged at the bottom of the gate plate tank and a baffle plate arranged at the upper end of the elastic part, and when the elastic part is in a free state, the upper surface of the baffle plate is level with the bottom of the flow channel.

Further improve, elastic component is including locating the flashboard towards the projection of guide block a side, the one end that the flashboard was kept away from to the projection is equipped with spacing post, the guide block is equipped with and supplies projection male first hole of stepping down, first hole bottom of stepping down is equipped with and supplies spacing post male second hole of stepping down, the diameter in first hole of stepping down is greater than the diameter in second hole of stepping down, first downthehole belleville spring group that is equipped with of stepping down, spacing post passes the inner circle of belleville spring group and inserts in the second hole of stepping down, the projection supports and locates on the belleville spring group.

The improved butterfly spring assembly is characterized in that the improved butterfly spring assembly is further improved, the limiting sealing assembly comprises a limiting hook portion and a limiting convex block, the limiting hook portion is arranged around the periphery of the flashboard, the limiting convex block is arranged on the guide block and clamped with the limiting hook portion in a matched mode, a sealing ring is sleeved on the outer surface of the limiting convex block, and when the butterfly spring assembly is in a free state, the limiting hook portion is abutted to the limiting convex block.

The valve body, the valve cover, the guide block, the flashboard and the baffle plate comprise the following components in parts by weight: 1.3 to 1.6 percent of carbon, 19 to 23 percent of chromium, 0.5 to 1.2 percent of calcium, 0.9 to 1.1 percent of manganese, 0.2 to 0.5 percent of boron, 0.9 to 1.3 percent of silicon, 0.01 to 0.04 percent of sulfur, 0.02 to 0.03 percent of phosphorus, 3.0 to 4.0 percent of molybdenum, 2.0 to 3.0 percent of nickel, 1.0 to 1.5 percent of copper, 0.7 to 0.9 percent of vanadium, 0.9 to 1 percent of titanium and the balance of iron.

In a further improvement, the surfaces of the valve body, the valve cover, the guide block, the flashboard and the baffle are coated with a wear-resistant coating.

Further improved, the valve body, the valve cover, the guide block, the flashboard, the baffle plate and other accessories which are not assembled are placed in a cathode arc device, the cathode arc device is vacuumized, the negative pressure is maintained at 6-7kPa, Ar + particles are used for bombarding the surfaces of the accessories for sputtering cleaning, a titanium-aluminum alloy target and nitrogen are used for deposition, and then cooling is carried out to form the wear-resistant coating.

By adopting the technical scheme, the invention has the beneficial effects that:

1. according to the invention, the elastic assembly is arranged between the flashboard and the guide block, so that the flashboards in the left flashboard assembly and the right flashboard assembly are pressed by the elastic force of the elastic assembly to overcome the problem of insufficient sealing property caused by abrasion of a sealing surface;

2. the elastic component adopts a butterfly spring group, so that the phenomenon that the flashboard and the guide block are loosened due to failure of the spring after long-time use can be effectively overcome, and the economy, the safety and the service life of the spring assembly are superior to those of a common spring;

3. the flashboard is provided with the limiting convex block, the limiting component is arranged around the periphery of the flashboard and matched with the sealing ring, so that the flashboard is covered on the wedge-shaped surface of the guide block in a cover body manner, and solid particles in a conveying medium are prevented from being clamped between the flashboard and the guide block to influence the plugging of the flashboard component;

4. the main components of the gate valve are iron, carbon, chromium, calcium, manganese, boron, silicon, sulfur and phosphorus alloys, and the alloy formed by properly adding molybdenum, nickel, copper, vanadium, titanium and the like meets the requirements of high density and high impact toughness of the structure of the gate valve, slows down the abrasion caused by the solid particle scouring of the gate valve in use, and enhances the durability of the gate valve;

5. according to the invention, the valve body, the valve cover, the guide block, the flashboard and the baffle are plated with the wear-resistant coating by adopting a cathode arc evaporation method, so that the wear resistance of the valve is further improved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;

FIG. 3 is a schematic illustration of an open configuration of a shutter assembly in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural view of a shutter assembly according to an embodiment of the present invention;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

fig. 6 is a partially enlarged view of fig. 4 at C.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 6, this embodiment provides a two-way seal gate valve, including valve body 1, valve gap 2, flashboard subassembly 3, valve rod 4 and hand wheel 5, valve gap 2 passes through the bolt and installs at 1 top of valve body, valve body 1 is provided with feed inlet 11 and discharge gate 12 of coaxial setting, for the runner 13 that supplies the medium circulation between feed inlet 11 and the discharge gate 12, flashboard subassembly 3 is used for shutoff runner 13 in locating the runner, the bottom of runner 13 is equipped with flashboard groove 14, the lower extreme of valve rod 4 penetrate in the valve body 1 and with flashboard subassembly 3 screwed connection from valve gap 2, the upper end and the hand wheel 5 fixed connection of valve rod 4.

The direction of the medium flow is defined as left and right, and the direction horizontally perpendicular to the medium flow direction is defined as front and back.

Specifically, the gate plate assembly 3 includes a guide block 31 disposed in the valve body, and a left gate plate assembly 32 and a right gate plate assembly 33 disposed on the left and right sides of the guide block 31, the inner wall of the valve body 1 is provided with a limiting strip 15 on the front and rear sides of the guide block 31, the front and rear sides of the guide block 31 are respectively provided with a limiting groove 311, the limiting strip 15 extends into the limiting groove 311, so that the guide block 31 can move up and down along the limiting strip 15, the upper end of the guide block 31 protrudes upward to form a guide post 312, the upper end of the valve cap 2 is provided with an extension sleeve 8, the guide post 312 passes through the valve cap 2 to extend into the extension sleeve 8 and moves up and down along the valve cap 2 along with the guide block 312, the hand wheel 5 is rotatably disposed on the upper end of the extension sleeve 8 through a bearing 9, a side surface of the valve cap 2 contacting with the guide post 312 is provided with a sealing filler 6, the guide post 312 is, the lower end of the valve rod 4 is spirally provided in the guide groove 313, thereby realizing the ascending and descending of the guide block 31.

The left and right sides face of the guide block 31 is a wedge face, the left flashboard assembly 32 and the right flashboard assembly 33 both include flashboards 301 which respectively correspond to the wedge face in parallel, one side of the flashboard 301 which is far away from the corresponding wedge face is provided with a sealing gasket 302, the sealing gasket 302 is used for enhancing the sealing performance of the flashboard assembly when blocking the runner 13, the flashboard 301 enables the flashboard assembly to move relative to the guide block 31 through four groups of elastic assemblies 303, the four groups of elastic assemblies 303 are distributed in a quadrilateral way, each group of the elastic assemblies 303 comprises a convex column 3031 which is arranged on one side face of the flashboard 301 facing the guide block 31, one end of the convex column 3031 which is far away from the flashboard 301 is provided with a limiting column 3032, the guide block 31 is provided with a first abdicating hole 3033 for inserting the convex column 3031, the bottom of the first abdicating hole 3033 is provided with a second abdicating hole 3034 for inserting the limiting column 3032, the, a belleville spring group 3035 is arranged in the first abdicating hole 3033, the limiting column 3032 penetrates through the inner ring of the belleville spring group 3035 and is inserted into the second abdicating hole 3034, the convex column 3031 abuts against the belleville spring group 3035, a limiting sealing assembly 304 is arranged between the periphery of the flashboard 301 and the guide block 31, the limiting sealing assembly 304 comprises a limiting hook 3041 arranged around the periphery of the flashboard 301 and a limiting bump 3042 arranged on the guide block 31 and in matched clamping with the limiting hook 3041, a sealing ring 3043 is sleeved on the outer surface of the limiting bump 3042, when the belleville spring assembly 3035 is in a free state, the inner surface of the limiting hook 3041 abuts against the limiting bump 3042, an elastic baffle assembly is arranged in the flashboard slot 14 and comprises an elastic component 71 fixedly arranged at the bottom of the flashboard slot 14 and a baffle 72 arranged at the upper end of the elastic component 71, and in the embodiment, the elastic component 71 is composed of a plurality of springs, referring to fig. 3, when the elastic member 71 is in a free state, the upper surface of the baffle 72 is flush with the bottom of the flow channel 13.

Each part such as valve body 1, valve gap 2, guide block 31, flashboard 301 and baffle 72 all includes the following component by weight: 2.0-3.0% of carbon, 12.0-20.0% of chromium, 0.5-1.2% of calcium, 1.1-1.6% of manganese, 0.2-0.5% of boron, 1.0-1.2% of silicon, 0.05-0.10% of sulfur, 0.04-0.08% of phosphorus, 3.0-4.0% of molybdenum, 2.0-3.0% of nickel, 1.0-1.5% of copper, 0.7-0.9% of vanadium, 0.9-1% of titanium, and the balance of iron and inevitable impurities, and is prepared by the following steps:

s1, smelting: sequentially placing the prepared furnace burden into an induction furnace, introducing argon into the induction furnace, raising the temperature of the induction furnace to 2700-DEG C and 3000 ℃ after closing a furnace door, preserving the heat for 3-4h, vacuumizing to maintain the negative pressure to be 0.3-0.4kPa during the heat preservation process, opening the furnace door to take out the furnace slag floating on the surface of the liquid, and taking the residual liquid in the induction furnace as matrix alloy liquid;

s2, detection: sampling and carrying out chemical analysis, and controlling each chemical component within a specified range;

s3, pouring: taking the matrix alloy liquid out of the furnace, pouring the matrix alloy liquid into a mold to form each accessory, wherein the taking-out temperature of the matrix alloy liquid is 2600-;

s4, heat treatment: putting each accessory alloy blank into an electric furnace, introducing certain argon into the electric furnace, raising the temperature of the electric furnace to 1200-1300 ℃ at a heating rate of 10-15 ℃/min, preserving heat for 3-5h, taking out each heat-preserved accessory alloy blank, placing the heat-preserved accessory alloy blank into a nitrate solution with the temperature of 180-200 ℃, preserving heat when the temperature of the nitrate solution is raised to 280-300 ℃, specifically setting the heat preservation time according to the size of each accessory alloy blank, wherein the molar ratio of the nitrate solution is magnesium nitrate: potassium nitrate: sodium nitrate: 2-3: 3-5: 4-6: 10-12;

s5, preprocessing: and (2) immersing each accessory alloy blank subjected to heat treatment in water at room temperature for 5-10min, taking out, drying, immersing in acetone, cleaning by using an ultrasonic cleaning machine for 15-20min at the cleaning temperature of 55-65 ℃, taking out, drying, immersing in ether at room temperature for 10-15min, taking out, placing in a vacuum chamber, and drying to obtain each accessory alloy matrix.

The argon is introduced before smelting, so that the contact with oxygen during smelting can be reduced, the content of oxides in alloy matrixes of various accessories is reduced, and the service life of the gate valve is further prolonged; in the heat treatment, a nitrate solution is adopted for isothermal quenching, the temperature is raised to uniformly distribute austenite in each accessory alloy blank, and the high specific heat capacity of the nitrate solution is utilized for rapid cooling to convert the austenite into bainite, so that the toughness of each accessory alloy blank is greatly improved.

In order to further improve the wear resistance of the invention, the surfaces of the valve body 1, the valve cover 2, the guide block 31, the gate plate 301, the baffle plate 72 and other accessories are coated with a wear-resistant coating, specifically, the alloy matrix of each accessory prepared by the steps is placed in a cathode arc device, the vacuum pumping is carried out to maintain the negative pressure at 6-7kPa, the surface of the accessory is bombarded by Ar + particles to carry out sputtering cleaning, a titanium-aluminum alloy target and nitrogen are adopted to carry out deposition, and then the cooling is carried out to form the wear-resistant coating, wherein the negative bias of each accessory is-120 to-160V, the deposition temperature is 390-410 ℃, the titanium-aluminum-nitrogen wear-resistant coating is formed, the thickness of the wear-resistant coating is 3-5 mu m, the heat resistance, the corrosion resistance and the oxidation resistance are obviously improved, and the application range of the invention is wider.

The cathode arc equipment comprises a vacuum system, a cathode arc evaporation source, a bias system, an air supply system, a throttle valve system, a heating system, a temperature measuring system, a workpiece rotating frame system, a cooling water system and a control system, which are all conventional equipment.

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a two-way sealing gate valve, includes valve body, valve gap, flashboard subassembly, valve rod and hand wheel, the valve gap passes through the bolt and installs at the valve body top, the valve body is provided with the feed inlet and the discharge gate of coaxial setting, for the runner that supplies the medium circulation between feed inlet and the discharge gate, the flashboard subassembly is located in the runner, the bottom of runner is equipped with the flashboard groove, the lower extreme of valve rod penetrates in the valve body and is connected with the flashboard subassembly from the valve gap, the upper end and the hand wheel connection of valve rod, the direction that the definition medium flows is about, and is front and back with the direction of medium flow direction horizontal vertical, its:

2. The gate valve of claim 1, wherein: the elastic component comprises a convex column arranged on one side face of the flashboard facing the guide block, a limiting column is arranged at one end, far away from the flashboard, of the convex column, a first abdicating hole for inserting the convex column is formed in the guide block, a second abdicating hole for inserting the limiting column is formed in the bottom of the first abdicating hole, the diameter of the first abdicating hole is larger than that of the second abdicating hole, a disc spring group is arranged in the first abdicating hole, the limiting column penetrates through an inner ring of the disc spring group and is inserted into the second abdicating hole, and the convex column is abutted to the disc spring group.

3. The gate valve of claim 2, wherein: spacing sealing component includes around the peripheral spacing hook portion that sets up of flashboard and locate on the guide block with the spacing lug of spacing hook portion cooperation joint, the surface cover of spacing lug is equipped with the sealing washer, works as when the belleville spring subassembly is in free state, spacing hook portion and spacing lug butt.

4. A bi-directional sealing gate valve as claimed in claim 3, wherein: the valve body, the valve cover, the guide block, the flashboard and the baffle all comprise the following components in parts by weight: 1.3 to 1.6 percent of carbon, 19 to 23 percent of chromium, 0.5 to 1.2 percent of calcium, 0.9 to 1.1 percent of manganese, 0.2 to 0.5 percent of boron, 0.9 to 1.3 percent of silicon, 0.01 to 0.04 percent of sulfur, 0.02 to 0.03 percent of phosphorus, 3.0 to 4.0 percent of molybdenum, 2.0 to 3.0 percent of nickel, 1.0 to 1.5 percent of copper, 0.7 to 0.9 percent of vanadium, 0.9 to 1 percent of titanium and the balance of iron.

5. The gate valve of claim 4, wherein: the surfaces of the valve body, the valve cover, the guide block, the flashboard and the baffle are coated with a layer of wear-resistant coating.

6. The gate valve of claim 5, wherein: the wear-resistant coating is formed by adopting the following process: placing the unassembled fittings such as the valve body, the valve cover, the guide block, the flashboard, the baffle plate and the like in a cathode arc device, vacuumizing to maintain the negative pressure at 6-7kPa, bombarding the surfaces of the fittings with Ar & lt + & gt particles to perform sputtering cleaning, depositing by adopting a titanium-aluminum alloy target and nitrogen, and cooling to form the wear-resistant coating.