CN112066017A

CN112066017A - Gate valve

Info

Publication number: CN112066017A
Application number: CN202010780871.5A
Authority: CN
Inventors: 黄洪刚; 张柏; 尹肖飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2020-12-11

Abstract

The invention discloses a gate valve, which comprises a valve body, wherein a left-right through channel is arranged in the valve body, the left end of the channel is an inlet, and the right end of the channel is an outlet; the valve body is internally and slidably connected with a flashboard; a bulge is arranged on the outer side of the valve body; a valve block is fixedly arranged at the upper end of the bulge, a valve cavity with an opening at the upper end is arranged in the valve block, and a cover plate is fixedly arranged at the opening at the upper end of the valve cavity; a valve pocket is fixedly arranged in the middle of the valve cavity, a piston rod is connected in the valve pocket in a sliding mode, an upper piston is fixedly arranged at the upper end of the piston rod, and a lower piston is arranged at the lower end of the piston rod; a valve rod with the upper end extending out of the cover plate and the lower end extending into the upper cavity is fixedly arranged in the piston rod, and the lower end of the valve rod is connected with the upper end of the flashboard; a first cavity chamber, a second cavity chamber, a third cavity chamber and a fourth cavity chamber are formed in the valve cavity; the upper end of the valve block is provided with a manual assembly and a valve control assembly, and the gate valve is simple in structure and can be opened or closed quickly.

Description

Gate valve

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a gate valve.

Background

The gate valve is the most important valve at present, and is widely used for the circulation and the stopping of media such as liquid, gas, dust and the like. Generally, the gate valve includes the valve body, and the valve body lower part has import and export, and the left end of import and the right-hand member of export all have sealed face, and the moving seal complex is equipped with between two sealed faces can reciprocate and can not rotatory flashboard. Meanwhile, the upper part of the flashboard is connected with a valve rod, and the upper part of the valve rod is connected with a handle through a lead screw nut mechanism. After the handle rotates, the valve rod is driven to move up and down through the screw rod nut mechanism, then the flashboard moves up and down to seal or open the two sealing surfaces, and finally the inlet and the outlet are communicated or cut off. The gate valve in the prior art has the following problems in the use process:

(1) the valve rod of the gate valve in the prior art is only subjected to upward acting force of a medium in a pipeline, when the pressure in the pipeline is higher, the pressure in the pipeline acts on the valve rod to generate upward very large acting force on the valve rod, so that a flashboard needs large operating force when closed, and the flashboard is difficult to close;

(2) in the gate valve in the prior art, the valve rod is driven to move up and down through the screw rod nut mechanism by rotating the handle, so that the operation time is longer when the gate valve is opened and closed;

(3) when the gate valve in the prior art is operated by adopting hydraulic control, a separate oil source or gas source and a corresponding control valve are required to be arranged outside, the structure is complex, and the cost is increased.

Disclosure of Invention

The invention aims to provide a gate valve which is simple in structure and can be opened or closed quickly.

In order to achieve the purpose, the invention provides the following technical scheme:

a gate valve comprises a valve body, wherein a left-right through channel is arranged in the valve body, the left end of the channel is an inlet, and the right end of the channel is an outlet; the valve body is internally and slidably connected with a gate plate along the axial direction vertical to the channel, and the gate plate is used for controlling the on-off of the channel; the outer side of the valve body is provided with a bulge, an upper chamber communicated with the inlet is arranged at the upper end of the flashboard in the bulge, and a lower chamber communicated with the inlet is arranged at the lower end of the flashboard in the valve body; a valve block is fixedly arranged at the upper end of the bulge, a valve cavity with an opening at the upper end is arranged in the valve block, and a cover plate is fixedly arranged at the opening at the upper end of the valve cavity; the middle part of the valve cavity is fixedly provided with a valve sleeve, a piston rod is connected in the valve sleeve in a sliding manner along the axial direction of the valve cavity, the upper end of the piston rod is fixedly provided with an upper piston connected in the valve cavity in a sliding manner, and the lower end of the piston rod is provided with a lower piston connected in the lower valve cavity in a sliding manner; the piston rod and the lower piston are internally provided with mounting holes along the axial direction of the valve cavity, the mounting holes are internally and fixedly provided with valve rods of which the upper ends extend out of the cover plate and the lower ends extend into the upper cavity, and the lower ends of the valve rods are connected with the upper ends of the flashboards and used for driving the flashboards to move up and down; the valve cavity forms a first chamber between the upper piston and the cover plate, a second chamber communicated with the atmosphere between the upper piston and the valve sleeve, a third chamber communicated with the inlet between the valve sleeve and the lower piston, and a fourth chamber between the lower piston and the bottom of the valve cavity; the sectional area of the valve rod is S1, the sectional area of the lower piston is S2, the sectional area of the piston rod is S3, and S1 is S2-S3; the upper end of the valve block is provided with a manual assembly, and the manual assembly is used for being connected with the upper end of the valve rod when the flashboard is required to be manually operated to move up and down; the valve block is internally provided with a valve control assembly, and when the flashboard needs to be manually operated to move up and down, the valve control assembly controls the first cavity and the fourth cavity to be communicated; when the hydraulic control flashboard needs to move upwards, the valve control assembly controls the third chamber to be communicated with the fourth chamber, and the first chamber is communicated with the outlet; when the hydraulic control flashboard needs to move downwards, the valve control assembly controls the third cavity to be communicated with the first cavity, and the fourth cavity is communicated with the outlet.

Furthermore, the manual assembly comprises a threaded rod, a vertical frame is arranged on the cover plate, a transverse frame is arranged at the upper end of the vertical frame, and the threaded rod is in threaded connection with the transverse frame and is in a coaxial position with the valve rod; a hand wheel is fixedly arranged at the upper end of the threaded rod; the upper end of valve rod is equipped with the inserting groove, the lower extreme of threaded rod is equipped with the lug that is used for inserting in the inserting groove, and when needs manual operation flashboard up-and-down motion, the lug inserts in the inserting groove and is fixed by the pin, and when needs hydraulic control flashboard up-and-down motion, extracts the pin and takes off the threaded rod from the crossbearer.

Furthermore, the valve control assembly comprises a valve core, a valve hole is formed in the valve block, the valve core is rotatably connected in the valve hole, a plug is fixedly installed at an opening of the valve hole, a shaft lever is rotatably connected in the plug, the shaft lever is fixedly connected with the valve core and used for driving the valve core to rotate, and a handle is installed at one end, extending out of the plug, of the shaft lever; a first through hole for communicating the inlet with the third chamber and a second through hole for communicating the valve hole with the outlet are formed in the valve body, the bulge and the valve block; a third through hole for communicating the third cavity with the valve hole, a fourth through hole for communicating the first cavity with the valve hole and a fifth through hole for communicating the fourth cavity with the valve hole are formed in the valve block; a sixth through hole, a seventh through hole and an eighth through hole are formed in the valve core; when the flashboard needs to be manually operated to move up and down, the fourth through hole is communicated with the fifth through hole through the seventh through hole; when the hydraulic control flashboard needs to move upwards, the sixth through hole communicates the third through hole with the fifth through hole, and the eighth through hole communicates the second through hole with the fourth through hole; when the hydraulic control flashboard needs to move downwards, the third through hole and the fourth through hole are communicated through the sixth through hole, and the second through hole and the fifth through hole are communicated through the eighth through hole.

Further, be equipped with the intercommunicating pore that is used for communicating passageway and upper chamber in the flashboard, when the flashboard was closed the passageway, intercommunicating pore and lower chamber intercommunication.

Furthermore, the outside of valve barrel is equipped with the locating hole, the outside fixed mounting of valve block has one end to stretch into the locating lever in the locating hole, be equipped with the gas pocket with second cavity intercommunication in valve barrel and the locating lever.

Furthermore, an inverted T-shaped groove is formed in the upper end of the flashboard, and an inverted T-shaped connecting block extending into the inverted T-shaped groove is arranged at the lower end of the valve rod; this setting can realize rotating along the circumferencial direction between flashboard and the valve rod and be connected and follow axial fixity and connect.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the invention is characterized in that a valve rod is fixedly provided with a piston rod, the sectional area of the valve rod is S1, the sectional area of the lower piston is S2, the sectional area of the piston rod is S3, and S1 is S2-S3; the force acting on the lower piston when the liquid of the inlet enters the third chamber is equal to the force acting on the valve rod and opposite in direction, so that the acting force of the pressure of the inlet on the valve rod is balanced, the pressure of the inlet cannot generate resistance to the operation of the valve rod, and the opening and the closing of the gate plate are easier;

(2) the valve core is arranged, the valve rod can be driven to ascend and descend by controlling the pressure of a medium in the pipeline, the time for opening and closing the flashboard can be reduced because a screw rod nut mechanism is not needed like the prior art, the pressure is controlled to directly utilize the pressure of an inlet in the pipeline, the structure is simple, and the cost is reduced;

(3) the hydraulic control gate valve is also provided with a manual assembly, namely, the gate valve can be opened and closed by manually rotating the handle in an emergency, and the hydraulic control gate valve can also be opened and closed by controlling the valve core; the invention can realize two operation modes of manual operation and hydraulic control operation.

Drawings

FIG. 1 is a cross-sectional view of the present invention, shown in a manually closed position;

3 FIG. 3 2 3 is 3a 3 sectional 3 view 3 of 3A 3- 3A 3 in 3 FIG. 3 1 3; 3

FIG. 3 is a cross-sectional view of the present invention, shown in a manually opened position;

FIG. 4 is a cross-sectional view of the present invention, shown in a hydraulically-controlled open position;

fig. 5 is a cross-sectional view of the present invention, now in a pilot-operated shut-off condition.

Detailed Description

Referring to fig. 1-5, a gate valve includes a valve body 1, a left-right through channel 11a is provided in the valve body 1, the left end of the channel 11a is an inlet, and the right end is an outlet; a flashboard 4 is connected in the valve body 1 in a sliding manner along the axial direction perpendicular to the channel 11a, and the flashboard 4 is used for controlling the on-off of the channel 11 a; a bulge 11b is arranged on the outer side of the valve body 1, an upper chamber 1b communicated with the inlet is arranged at the upper end of the flashboard 4 in the bulge 11b, and a lower chamber 1a communicated with the inlet is arranged at the lower end of the flashboard 4 in the valve body 1; the upper end of the bulge 11b is fixedly provided with a valve block 2, a valve cavity 21 with an opening at the upper end is arranged in the valve block 2, and the opening at the upper end of the valve cavity 21 is fixedly provided with a cover plate 3; a valve pocket 7 is fixedly arranged in the middle of the valve cavity 21, a piston rod 6 is connected in the valve pocket 7 in a sliding manner along the axial direction of the valve cavity 21, an upper piston 9 connected in the valve cavity 21 in a sliding manner is fixedly arranged at the upper end of the piston rod 6, and a lower piston 61 connected in the lower valve cavity 21 in a sliding manner is arranged at the lower end of the piston rod; be equipped with mounting hole 62 along the axial of valve pocket 21 in piston rod 6 and the lower piston 61, fixed mounting has the upper end to stretch out apron 3, lower extreme and stretches into the valve rod 5 in the upper chamber 1b in the mounting hole 62, the lower extreme of valve rod 5 is connected with the upper end of flashboard 4 and is used for driving flashboard 4 up-and-down motion, the upper end of flashboard 4 is equipped with the T word groove 41 that falls, the lower extreme of valve rod 5 is equipped with the T word connecting block 51 that falls who stretches into in the T word groove 41 that falls.

The valve cavity 21 forms a first chamber 3b between the upper piston 9 and the cover plate 3, a second chamber 3a communicating with the atmosphere between the upper piston 9 and the valve housing 7, a third chamber 2b communicating with the inlet between the valve housing 7 and the lower piston 61, and a fourth chamber 2a between the lower piston 61 and the bottom of the valve cavity 21; the sectional area of the valve rod 5 is S1, the sectional area of the lower piston 61 is S2, the sectional area of the piston rod 6 is S3, and S1 is S2-S3; the upper end of the valve block 2 is provided with a manual assembly, and the manual assembly is used for being connected with the upper end of the valve rod 5 when the flashboard 4 needs to be manually operated to move up and down; a valve control assembly is arranged in the valve block 2, and when the gate plate 4 needs to be manually operated to move up and down, the valve control assembly controls the first cavity 3b to be communicated with the fourth cavity 2 a; when the hydraulic control flashboard 4 needs to move upwards, the valve control assembly controls the third cavity 2b to be communicated with the fourth cavity 2a, and the first cavity 3b is communicated with the outlet; when the hydraulic control flashboard 4 needs to move downwards, the valve control assembly controls the third chamber 2b to be communicated with the first chamber 3b, and the fourth chamber 2a is communicated with the outlet.

The manual assembly comprises a threaded rod 10, a vertical frame 3a is arranged on the cover plate 3, a transverse frame 3b is arranged at the upper end of the vertical frame 3a, and the threaded rod 10 is in threaded connection with the transverse frame 3b and is in a coaxial position with the valve rod 5; a hand wheel 10a is fixedly arranged at the upper end of the threaded rod 10; the upper end of the valve rod 5 is provided with an insertion groove 52, the lower end of the threaded rod 10 is provided with a convex block 10b which is inserted into the insertion groove 52, when the gate plate 4 needs to be manually operated to move up and down, the convex block 10b is inserted into the insertion groove 52 and is fixed by the pin 11, and when the hydraulic control gate plate 4 needs to move up and down, the pin 11 is pulled out and the threaded rod 10 is taken down from the cross frame 3 b.

The valve control assembly comprises a valve core 12, a valve hole 22 is formed in the valve block 2, the valve core 12 is rotatably connected in the valve hole 22, a plug 23 is fixedly installed at an opening of the valve hole 22, a shaft rod 13 is rotatably connected in the plug 23, the shaft rod 13 is fixedly connected with the valve core 12 and used for driving the valve core 12 to rotate, and a handle 14 is installed at one end, extending out of the plug 23, of the shaft rod 13; a first through hole 101 for communicating the inlet with the third chamber 2b and a second through hole 102 for communicating the valve hole 22 with the outlet are arranged in the valve body 1, the bulge 11b and the valve block 2; a third through hole 105 for communicating the third chamber 2b with the valve hole 22, a fourth through hole 103 for communicating the first chamber 3b with the valve hole 22, and a fifth through hole 104 for communicating the fourth chamber 2a with the valve hole 22 are formed in the valve block 2; a sixth through hole 121, a seventh through hole 122 and an eighth through hole 123 are arranged in the valve core 12; when the gate plate 4 needs to be manually operated to move up and down, the seventh through hole 122 communicates the fourth through hole 103 with the fifth through hole 104; when the hydraulic control gate plate 4 needs to move upwards, the sixth through hole 121 communicates the third through hole 105 with the fifth through hole 104, and the eighth through hole 123 communicates the second through hole 102 with the fourth through hole 103; when downward movement of the pilot operated shutter 4 is required, the sixth through hole 121 communicates the third through hole 105 with the fourth through hole 103, and the eighth through hole 123 communicates the second through hole 102 with the fifth through hole 104.

A communication hole 42 for communicating the passage 11a and the upper chamber 1b is provided in the shutter 4, and when the shutter 4 closes the passage 11a, the communication hole 42 communicates with the lower chamber 1 a. The outside of valve barrel 7 is equipped with locating hole 7a, the outside fixed mounting of valve block 2 has one end to stretch into locating hole 7 a's locating lever 8, be equipped with the gas pocket 81 with second chamber 3a intercommunication in valve barrel 7 and the locating lever 8.

When the valve plate 4 needs to be manually controlled to move up and down, the convex block 10b is inserted into the insertion groove 52 and fixed by the pin 11, and meanwhile, the handle 14 and the shaft rod 13 drive the valve core 12 to rotate to a position where the seventh through hole 122 communicates the fourth through hole 103 with the fifth through hole 104, as shown in fig. 1, the first cavity 3b is communicated with the fourth cavity 2a, so that the valve rod 5 can be manually controlled to move up and down. When the hydraulic control gate plate 4 needs to move up and down, the pin 11 is pulled out, the threaded rod 10 is taken down from the cross frame 3b, as shown in fig. 3, when the control gate plate 4 is opened, the control valve core 12 rotates to the position shown in fig. 4, the sixth through hole 121 communicates the third through hole 105 with the fifth through hole 104, the eighth through hole 123 communicates the second through hole 102 with the fourth through hole 103, at the moment, the third cavity 2b communicates with the fourth cavity 2a, the first cavity 3b communicates with an outlet, and under the action of pressure difference of the inlet and the outlet, the gate plate 4 moves up and is opened; when the control gate plate 4 is closed, the control valve core 12 rotates to the position shown in fig. 5, the sixth through hole 121 communicates the third through hole 105 with the fourth through hole 103, the eighth through hole 123 communicates the second through hole 102 with the fifth through hole 104, at this time, the third chamber 2b communicates with the first chamber 3b, the fourth chamber 2a communicates with the outlet, and the gate plate 4 moves downward and is closed under the action of the inlet-outlet pressure difference.

A piston rod 6 is fixedly arranged on the valve rod 5, the cross section of the valve rod 5 is S1, the cross section of the lower piston 61 is S2, the cross section of the piston rod 6 is S3, and S1 is S2-S3, on one hand, the pressure in the inlet acts on the upper end and the lower end of the gate plate 4 through the communication hole 42, so that the vertical stress of the gate plate 4 is balanced, and the pressure acts on S1 of the valve rod 5 to generate upward acting force F1 on the valve rod 5; on the other hand, the pressure in the inlet enters the third chamber 2b through the first through hole 101, acts on the annular area (S2-S3) of the lower piston 61, and generates a downward acting force F2 on the valve rod 5, and F1 is F2, so that the acting force resultant force of the pressure of the inlet on the gate plate 4 and the valve rod 5 is 0.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A gate valve comprises a valve body, wherein a left-right through channel is arranged in the valve body, the left end of the channel is an inlet, and the right end of the channel is an outlet; the valve body is internally and slidably connected with a gate plate along the axial direction vertical to the channel, and the gate plate is used for controlling the on-off of the channel; the valve is characterized in that a bulge is arranged on the outer side of the valve body, an upper chamber communicated with an inlet is arranged at the upper end of the flashboard in the bulge, and a lower chamber communicated with the inlet is arranged at the lower end of the flashboard in the valve body; a valve block is fixedly arranged at the upper end of the bulge, a valve cavity with an opening at the upper end is arranged in the valve block, and a cover plate is fixedly arranged at the opening at the upper end of the valve cavity; the middle part of the valve cavity is fixedly provided with a valve sleeve, a piston rod is connected in the valve sleeve in a sliding manner along the axial direction of the valve cavity, the upper end of the piston rod is fixedly provided with an upper piston connected in the valve cavity in a sliding manner, and the lower end of the piston rod is provided with a lower piston connected in the lower valve cavity in a sliding manner; the piston rod and the lower piston are internally provided with mounting holes along the axial direction of the valve cavity, the mounting holes are internally and fixedly provided with valve rods of which the upper ends extend out of the cover plate and the lower ends extend into the upper cavity, and the lower ends of the valve rods are connected with the upper ends of the flashboards and used for driving the flashboards to move up and down; the valve cavity forms a first chamber between the upper piston and the cover plate, a second chamber communicated with the atmosphere between the upper piston and the valve sleeve, a third chamber communicated with the inlet between the valve sleeve and the lower piston, and a fourth chamber between the lower piston and the bottom of the valve cavity; the sectional area of the valve rod is S1, the sectional area of the lower piston is S2, the sectional area of the piston rod is S3, and S1 is S2-S3; the upper end of the valve block is provided with a manual assembly, and the manual assembly is used for being connected with the upper end of the valve rod when the flashboard is required to be manually operated to move up and down; the valve block is internally provided with a valve control assembly, and when the flashboard needs to be manually operated to move up and down, the valve control assembly controls the first cavity and the fourth cavity to be communicated; when the hydraulic control flashboard needs to move upwards, the valve control assembly controls the third chamber to be communicated with the fourth chamber, and the first chamber is communicated with the outlet; when the hydraulic control flashboard needs to move downwards, the valve control assembly controls the third cavity to be communicated with the first cavity, and the fourth cavity is communicated with the outlet.

2. The gate valve of claim 1, wherein the manual assembly comprises a threaded rod, the cover plate is provided with a vertical frame, the upper end of the vertical frame is provided with a cross frame, and the threaded rod is in threaded connection with the cross frame and is in a coaxial position with the valve rod; a hand wheel is fixedly arranged at the upper end of the threaded rod; the upper end of valve rod is equipped with the inserting groove, the lower extreme of threaded rod is equipped with the lug that is used for inserting in the inserting groove, and when needs manual operation flashboard up-and-down motion, the lug inserts in the inserting groove and is fixed by the pin, and when needs hydraulic control flashboard up-and-down motion, extracts the pin and takes off the threaded rod from the crossbearer.

3. The gate valve of claim 1, wherein the valve control assembly comprises a valve core, a valve hole is formed in the valve block, the valve core is rotatably connected in the valve hole, a plug is fixedly installed at an opening of the valve hole, a shaft rod is rotatably connected in the plug, and the shaft rod is fixedly connected with the valve core and used for driving the valve core to rotate; a first through hole for communicating the inlet with the third chamber and a second through hole for communicating the valve hole with the outlet are formed in the valve body, the bulge and the valve block; a third through hole for communicating the third cavity with the valve hole, a fourth through hole for communicating the first cavity with the valve hole and a fifth through hole for communicating the fourth cavity with the valve hole are formed in the valve block; a sixth through hole, a seventh through hole and an eighth through hole are formed in the valve core; when the flashboard needs to be manually operated to move up and down, the fourth through hole is communicated with the fifth through hole through the seventh through hole; when the hydraulic control flashboard needs to move upwards, the sixth through hole communicates the third through hole with the fifth through hole, and the eighth through hole communicates the second through hole with the fourth through hole; when the hydraulic control flashboard needs to move downwards, the third through hole and the fourth through hole are communicated through the sixth through hole, and the second through hole and the fifth through hole are communicated through the eighth through hole.

4. The gate valve of claim 1, wherein a communication hole for communicating the passage and the upper chamber is provided in the gate plate, and the communication hole communicates with the lower chamber when the passage is closed by the gate plate.

5. The gate valve of claim 1, wherein the valve housing is provided with a positioning hole at an outer side thereof, the valve block is fixedly provided at an outer side thereof with a positioning rod having an end thereof extending into the positioning hole, and the valve housing and the positioning rod are provided with air holes communicating with the second chamber.

6. The gate valve of claim 1, wherein the upper end of the gate plate is provided with an inverted T-shaped groove, and the lower end of the valve rod is provided with an inverted T-shaped connecting block extending into the inverted T-shaped groove.