CN111197661A

CN111197661A - Gate valve

Info

Publication number: CN111197661A
Application number: CN202010063387.0A
Authority: CN
Inventors: 邵延荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-05-26

Abstract

The invention discloses a gate valve which comprises a valve body, wherein the valve body is provided with a valve cavity with an opening at the upper end, and a valve cover is fixedly arranged at the opening at the upper end of the valve cavity of the valve body; the left side of the valve body is provided with a left communicating pipe communicated with the valve cavity, the right side of the valve body is provided with a right communicating pipe communicated with the valve cavity, and the left communicating pipe and the right communicating pipe are coaxially arranged; the valve cavity is internally provided with an installation block, and the installation block is provided with a valve core assembly for controlling the on-off of the left communicating pipe and the right communicating pipe; the valve cover is in threaded connection with a screw, and the lower end of the screw is located in the valve cavity and connected with the valve core assembly for controlling the valve core assembly to axially move along the left communicating pipe; the gate valve is simple in structure, friction between the valve plate and the valve seat can be reduced, and the service life of the gate valve is greatly prolonged.

Description

Gate valve

Technical Field

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

Background

A flat gate valve is a sliding valve whose closing member is a parallel gate plate. The valve is widely applied to industrial equipment, and a closing member of the valve generally consists of a gate and a valve seat. The pressing force of the gate plate to the valve seat is controlled by the pressure of a medium acting on the gate plate, and the medium pushes the gate plate to press the valve seat so as to form a seal, so that the defects of the method are that: in the opening and closing process of the valve, friction can be generated between the flashboard and the valve seat, so that the sealing surface of the flashboard and the sealing surface of the valve seat are easily damaged by friction, and the service life is short; meanwhile, in the opening and closing processes of the valve, frictional resistance is generated between the flashboard and the valve seat, so that the required external driving device is increased, and the cost is increased.

Disclosure of Invention

The invention aims to provide a gate valve which is simple in structure, can reduce friction between a valve plate and a valve seat and greatly prolongs the service life of the gate valve.

In order to achieve the purpose, the invention provides the following technical scheme: a gate valve comprises a valve body, wherein the valve body is provided with a valve cavity with an opening at the upper end, and a valve cover is fixedly arranged at the opening at the upper end of the valve cavity of the valve body; the left side of the valve body is provided with a left communicating pipe communicated with the valve cavity, the right side of the valve body is provided with a right communicating pipe communicated with the valve cavity, and the left communicating pipe and the right communicating pipe are coaxially arranged; the valve cavity is internally provided with an installation block, and the installation block is provided with a valve core assembly for controlling the on-off of the left communicating pipe and the right communicating pipe; the valve cover is in threaded connection with a screw, and the lower end of the screw is located in the valve cavity and connected with the valve core assembly to control the valve core assembly to move axially along the left communicating pipe.

In a further technical scheme, the valve core assembly comprises a left piston, a right piston, a left plug and a right plug, a through mounting hole is formed in the mounting block along the axial direction of the left communicating pipe, the left plug is fixedly mounted at the left end of the mounting hole, and the right plug is fixedly mounted at the right end of the mounting hole; the left piston and the right piston are both connected in the mounting hole in a sliding manner; a left piston rod penetrating through the left plug is arranged on the left side of the left piston in an axially extending mode along the mounting hole, the left end of the left piston rod is located outside the mounting hole and is fixedly provided with a left valve plate used for controlling the on-off of a left communicating pipe, and a left spring used for forcing the left piston to move rightwards is arranged between the left piston and the left plug in the mounting hole; a right piston rod penetrating through the right plug is arranged on the right side of the right piston in an axially extending mode along the mounting hole, a right valve plate used for controlling the on-off of a right communicating pipe is fixedly mounted at the right end of the right piston rod outside the mounting hole, and a right spring used for forcing the right piston to move leftwards is arranged between the right piston and the right plug in the mounting hole;

the mounting block is internally provided with a piston hole which is coaxial with the screw rod and has an upper opening, the upper opening of the piston hole is fixedly provided with an upper plug, the piston hole is connected with a piston body in a sliding way, an upper piston rod which penetrates through the upper plug is arranged on the piston body in an axially extending way along the piston hole, and the upper end of the upper piston rod is fixedly connected with the lower end of the screw rod in the axial direction and is connected with the lower end of the screw rod in a sliding way along the circumferential direction; a first cavity is formed between the lower end of the piston body and the bottom of the piston hole in the piston hole, a first oil hole for communicating the valve cavity with the first cavity is formed in the piston body, and a one-way valve assembly for controlling liquid to flow into the first cavity is arranged in the first oil hole;

and a second cavity is formed between the left piston and the right piston in the mounting hole, and a second oil hole for communicating the first cavity with the second cavity is formed in the bottom of the mounting hole in the mounting block.

Through above-mentioned technical scheme, when its case subassembly was assembled, need fill the medium that the gate valve carried in first chamber and the second chamber through first oilhole and second oilhole.

In a further technical scheme, the upper end of the upper piston rod is provided with an installation groove with an opening at the upper end, the circumferential side surface of the lower end of the screw rod is provided with a convex shoulder which is rotatably connected in the installation groove, and the opening of the installation groove is in threaded connection with a baffle ring which is in sliding connection with the convex shoulder.

In a further technical scheme, a sliding groove is formed in the inner side wall of the valve cavity in the vertical direction, and a limiting sliding block which is connected into the sliding groove in a sliding mode is arranged on the mounting block.

In a further technical scheme, a left through hole communicated with the mounting hole is formed in the left plug, a right through hole communicated with the mounting hole is formed in the right plug, and an upper through hole communicated with the piston hole is formed in the upper plug.

In a further technical scheme, the check valve assembly comprises a marble, a first spring and a hollow first plug, a slotted hole communicated with the first oil hole is formed in the lower end of the piston body, the marble is located in the slotted hole and used for controlling the connection and disconnection of the first oil hole, the first plug is fixedly installed at an opening at the lower end of the slotted hole, and the first spring is located between the first plug and the marble and used for forcing the marble to be tightly pressed on the first oil hole.

Advantageous effects

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

(1) when the gate valve is closed, the medium in the gate valve is squeezed to control the left valve plate to be tightly pressed on the left communicating pipe, and simultaneously, the right valve plate is controlled to be tightly pressed on the right communicating pipe;

(2) the opening of the left valve plate and the right valve plate is controlled by using the medium which is the same as the conveying medium, so that the valve is more convenient;

(3) all operations can be completed only by rotating the screw rod, and the operation is simple and convenient.

Drawings

FIG. 1 is a cross-sectional view of the present invention with the left and right valve plates retracted;

FIG. 2 is a cross-sectional view of the left and right valve plates of the present invention as they are closed;

FIG. 3 is a cross-sectional view of the gate valve of the present invention fully open;

fig. 4 is an enlarged schematic view of a portion a in fig. 1.

Detailed Description

Referring to fig. 1 to 4, a gate valve includes a valve body 21, the valve body 21 has a valve cavity 211 with an upper opening, and a valve cover 22 is fixedly installed on the valve body 21 at the upper opening of the valve cavity 211; a left communicating pipe 12a communicated with the valve cavity 211 is arranged on the left side of the valve body 21, a right communicating pipe 12b communicated with the valve cavity 211 is arranged on the right side of the valve body, and the left communicating pipe 12a and the right communicating pipe 12b are coaxially arranged; the valve cavity 211 is internally provided with an installation block 3, the inner side wall of the valve cavity 211 is provided with a sliding groove 121 along the vertical direction, and the installation block 3 is provided with a limiting sliding block 3g which is connected in the sliding groove 121 in a sliding manner. The mounting block 3 is provided with a valve core assembly for controlling the on-off of the left communicating pipe 12a and the right communicating pipe 12 b; the valve cover 22 is connected with a screw rod 1 in a threaded manner, and the lower end of the screw rod 1 is located in the valve cavity 211 and is connected with the valve core assembly for controlling the valve core assembly to move axially along the left communicating pipe 12 a.

The valve core assembly comprises a left piston 4a1, a right piston 4b1, a left plug 10 and a right plug 11, a through mounting hole 301 is formed in the mounting block 3 along the axial direction of the left communicating pipe 12a, the left plug 10 is fixedly mounted at the left end of the mounting hole 301, and the right plug 11 is fixedly mounted at the right end of the mounting hole 301; the left piston 4a1 and the right piston 4b1 are both connected in the mounting hole 301 in a sliding manner; a left piston rod 4a penetrating through the left plug 10 is arranged on the left side of the left piston 4a1 in an axially extending mode along the mounting hole 301, the left end of the left piston rod 4a is located outside the mounting hole 301 and is fixedly provided with a left valve plate 6a used for controlling the on-off of the left communicating pipe 12a, and a left spring 5a used for forcing the left piston 4a1 to move rightwards is arranged between the left piston 4a1 and the left plug 10 in the mounting hole 301; the right side of the right piston 4b1 is provided with a right piston rod 4b penetrating through the right plug 11 along the axial extension of the mounting hole 301, the right end of the right piston rod 4b is positioned outside the mounting hole 301 and is fixedly provided with a right valve plate 6b for controlling the on-off of the right communicating pipe 12b, and a right spring 5b for forcing the right piston 4b1 to move leftwards is arranged between the right piston 4b1 and the right plug 11 in the mounting hole 301.

A piston hole 302 with an upper end opening coaxial with the screw rod 1 is arranged in the mounting block 3, an upper plug 9 is fixedly mounted at the upper end opening of the piston hole 302, a piston body 2 is connected in the piston hole 302 in a sliding manner, an upper piston rod 2b penetrating through the upper plug 9 is arranged on the piston body 2 in an axially extending manner along the piston hole 302, and the upper end of the upper piston rod 2b is fixedly connected with the lower end of the screw rod 1 in the axial direction and is connected with the lower end of the screw rod 1 in a sliding manner along the circumferential direction; a first chamber 3c is formed between the lower end of the piston body 2 and the bottom of the piston hole 302 in the piston hole 302, a first oil hole 2a for communicating the valve cavity 211 with the first chamber 3c is formed in the piston body 2, and a check valve assembly for controlling the liquid to flow into the first chamber 3c is formed in the first oil hole 2 a; the mounting hole 301 forms a second chamber 3a between the left piston 4a1 and the right piston 4b1, and the mounting block 3 is provided with a second oil hole 3b for communicating the first chamber 3c with the second chamber 3a at the bottom of the mounting hole 301.

The upper end of the upper piston rod 2b is provided with an installation groove 2b1 with an opening at the upper end, the circumferential side surface of the lower end of the screw rod 1 is provided with a shoulder 101 rotatably connected in the installation groove 2b1, and the opening of the installation groove 2b1 is in threaded connection with a stop ring 2c in sliding connection with the shoulder 101. A left through hole 10a communicated with the mounting hole 301 is formed in the left plug 10, a right through hole 11a communicated with the mounting hole 301 is formed in the right plug 11, and an upper through hole 9a communicated with the piston hole 302 is formed in the upper plug 9.

The check valve assembly comprises a marble 7, a first spring 8 and a hollow first plug 31, wherein the lower end of the piston body 2 is provided with a slot 203 communicated with the first oil hole 2a, the marble 7 is positioned in the slot 203 and used for controlling the on-off of the first oil hole 2a, the first plug 31 is fixedly arranged at the opening at the lower end of the slot 203, and the first spring 8 is positioned between the first plug 31 and the marble 7 and used for forcing the marble 7 to be tightly pressed on the first oil hole 2 a.

As shown in fig. 1, the gate valve according to the present invention has a simple structure, when the valve core is assembled, a medium fed into the first chamber 3c through the first oil hole 2a and the check valve assembly is required, the medium entering the first chamber 3c enters the second chamber 3a through the second oil hole 3b, until the first chamber 3c, the second oil hole 3b and the third chamber are filled with the medium, and the state of the valve core assembly after the medium is filled is as shown in fig. 1.

When the gate valve is changed from an open state to a closed state, the screw rod 1 is rotated, so that the screw rod 1 drives the mounting block 3 to move downwards along the chute 121, at this time, the mounting block 3 will not rotate along with the screw rod 1 under the cooperation of the limiting slide block 3g and the slide groove 121, when the mounting block 3 moves to the lowest end of the slide groove 121, as shown in fig. 1, the screw 1 continues to rotate, at this time, the piston body 2 is pushed by the upper piston rod 2b to further descend, and the medium in the first chamber 3c is pressed into the second chamber 3a through the second oil hole 3b, and the left piston 4a1 and the left piston rod 4a push the left valve plate 6a to overcome the left communicating pipe 12a of the left spring 5a until the valve plate is tightly attached to the left communicating pipe 12a, meanwhile, the right piston 4b1 and the right piston rod 4b push the right valve plate 6b to overcome the right communicating pipe 12b of the right spring 5b to move until the right valve plate is tightly attached to the right communicating pipe 12 b; at this time, as shown in fig. 2, the screw 1 cannot rotate downward, and at this time, the screw 1 stops rotating and is locked, and the gate valve is closed.

When the gate valve is changed from a closed state to an open state, the screw 1 is loosened and rotated to ascend, the left piston 4a1 drives the left valve plate 6a to move rightwards through the left piston rod 4a under the action of the left spring 5a, meanwhile, the right piston 4b1 drives the right valve plate 6b to move leftwards through the right piston rod 4b under the action of the right spring 5b, a medium in the second chamber 3a is extruded into the first chamber 3c through the second oil hole 3b, the upper piston rod 2b is pushed to move upwards through the piston body 2, when the left valve plate 6a and the right valve plate 6b move to the bottom, the piston body 2 moves upwards to contact with the upper plug 9 as shown in fig. 1, the screw 1 is continuously rotated to lift the mounting block 3 through the shoulder 101 and the retaining ring 2c, and moves upwards to the position shown in fig. 3, and the opening of the gate valve is completed; in the opening and closing processes of the gate valve, friction cannot be generated between the left valve plate and the left communicating pipe 12a, and between the right valve plate 6b and the right communicating pipe 12b, so that the service life of the valve clack can be prolonged, and the gate valve is not easy to damage; when fine leakage is generated in the first chamber 3c and the second chamber 3a due to long-term use, when the piston body 2 moves upwards, a medium can be replenished into the first chamber 3c and the second chamber 3a through the first oil hole 2a and the check valve assembly, so that the medium amount in the first chamber and the second chamber cannot be reduced, and the left valve plate 6a and the right valve plate 6b cannot be out of order.

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 is characterized by comprising a valve body, wherein the valve body is provided with a valve cavity with an upper end opening, and a valve cover is fixedly arranged at the upper end opening of the valve cavity of the valve body; the left side of the valve body is provided with a left communicating pipe communicated with the valve cavity, the right side of the valve body is provided with a right communicating pipe communicated with the valve cavity, and the left communicating pipe and the right communicating pipe are coaxially arranged; the valve cavity is internally provided with an installation block, and the installation block is provided with a valve core assembly for controlling the on-off of the left communicating pipe and the right communicating pipe; the valve cover is in threaded connection with a screw, and the lower end of the screw is located in the valve cavity and connected with the valve core assembly to control the valve core assembly to move axially along the left communicating pipe.

2. The gate valve of claim 1, wherein the valve core assembly comprises a left piston, a right piston, a left plug and a right plug, a through mounting hole is formed in the mounting block along the axial direction of the left communicating pipe, the left plug is fixedly mounted at the left end of the mounting hole, and the right plug is fixedly mounted at the right end of the mounting hole; the left piston and the right piston are both connected in the mounting hole in a sliding manner; a left piston rod penetrating through the left plug is arranged on the left side of the left piston in an axially extending mode along the mounting hole, the left end of the left piston rod is located outside the mounting hole and is fixedly provided with a left valve plate used for controlling the on-off of a left communicating pipe, and a left spring used for forcing the left piston to move rightwards is arranged between the left piston and the left plug in the mounting hole; a right piston rod penetrating through the right plug is arranged on the right side of the right piston in an axially extending mode along the mounting hole, a right valve plate used for controlling the on-off of a right communicating pipe is fixedly mounted at the right end of the right piston rod outside the mounting hole, and a right spring used for forcing the right piston to move leftwards is arranged between the right piston and the right plug in the mounting hole;

3. The gate valve of claim 2, wherein the upper end of the upper piston rod is provided with a mounting groove with an upper end opened, the screw rod is provided with a shoulder rotatably connected in the mounting groove at a circumferential side surface of a lower end, and a stop ring slidably connected with the shoulder is threadedly connected to an opening of the mounting groove.

4. The gate valve of claim 2, wherein a sliding groove is formed in the inner side wall of the valve cavity in the vertical direction, and a limiting sliding block which is connected in the sliding groove in a sliding manner is arranged on the mounting block.

5. The gate valve of claim 2, wherein the left plug is provided with a left through hole therein, the right plug is provided with a right through hole therein, and the upper plug is provided with an upper through hole therein, the upper through hole being in communication with the piston hole.

6. The gate valve of claim 2, wherein the check valve assembly comprises a ball, a first spring, and a first hollow plug, the lower end of the piston body is provided with a slot communicated with the first oil hole, the ball is positioned in the slot for controlling the opening and closing of the first oil hole, the first plug is fixedly installed at the lower opening of the slot, and the first spring is positioned between the first plug and the ball for forcing the ball to press against the first oil hole.