CN211852854U

CN211852854U - Pneumatic gate valve with parallel double flashboards and manual switching limiting mechanism

Info

Publication number: CN211852854U
Application number: CN202020114763.XU
Authority: CN
Inventors: 潘叶雷; 徐胜发
Original assignee: Zhejiang Tingyu Fluid Equipment Co ltd
Current assignee: Zhejiang Tingyu Fluid Equipment Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-11-03
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a pneumatic parallel double-gate-plate gate valve with a manual switching limiting mechanism, which comprises a valve body, wherein a valve rod is arranged on the valve body, a cylinder and a manual switching mechanism are arranged above the valve body, the manual switching mechanism comprises a hand wheel, a driving bevel gear, a driven bevel gear, a nut opening and closing mechanism, a conversion block, a switching handle and a limiting seat, the nut opening and closing mechanism comprises an opening and closing sleeve, the valve rod passes through the lower end face of the cylinder and is connected with a piston, the upper end of the valve rod is connected with a traction screw rod, and the traction screw rod is matched with the opening and closing nut after; the hand-operated switching mechanism further comprises a fully-closed shell, the hand wheel is arranged on the fully-closed shell through a transmission shaft, and a first sealing ring is arranged between the transmission shaft and the fully-closed shell. The utility model has the advantages of the leakproofness is good, and waterproof dustproof effect is good, effectively prevents lubricating grease loss, evaporation.

Description

Pneumatic gate valve with parallel double flashboards and manual switching limiting mechanism

Technical Field

The utility model relates to a valve field, concretely relates to pneumatic parallel double-disc gate valve of manual switching stop gear of area.

Background

When the current pneumatic open type single-action pneumatic belt manual control valve is switched to manual operation, a hand wheel drives a bevel gear to drive a split nut to rotate along a traction screw rod so as to be in threaded fit with the traction screw rod to realize axial movement of the traction screw rod, so that the valve is controlled to be opened, and when the valve is closed, the hand wheel is rotated reversely so as to rotate the traction screw rod reversely, and finally the valve is controlled to be closed; when the pneumatic control is started, the threaded connection state of the split nut and the traction screw is separated through the manual switching mechanism, and then the air cylinder supplies air to push the piston to drive the valve rod to axially displace, so that the valve is opened and closed; however, the existing manual switching mechanism is often in an open type, and after the switching mechanism is used outdoors or for a long time, lubricating grease loss, drying and deterioration, dust adhesion and dampness are easy to occur between transmission pairs, so that the moving resistance of the transmission pairs (the opening and closing of the opening and closing nut and the rotation of the opening and closing nut and the traction screw) is increased, the abrasion and the opening and closing force are aggravated, and the service life is greatly shortened.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims to provide a leakproofness is good, and waterproof dustproof effect is good, effectively prevents the pneumatic belt manual switching stop gear parallel double-disc gate valve of lubricating grease loss, evaporation.

Aiming at the problems, the following technical scheme is provided: a pneumatic parallel double-flashboard gate valve with a manual switching limiting mechanism comprises a valve body, wherein a valve rod is arranged on the valve body, an air cylinder is arranged above the valve body, a manual switching mechanism is arranged above the air cylinder, the manual switching mechanism comprises a hand wheel, a driving bevel gear, a driven bevel gear, a split nut mechanism arranged on the driven bevel gear, a switching block, a switching handle and a limiting seat, the split nut mechanism comprises a split nut and a split sleeve which is used for controlling the split nut to be opened and closed through rotation, the valve rod penetrates through the lower end face of the air cylinder and is connected with a piston, the valve rod is in sliding sealing fit with the lower end face of the air cylinder, the upper end of the valve rod is connected with a traction screw rod, and the traction; the manual switching mechanism is still including the totally closed casing that is fixed in the cylinder top, piston upside cavity intercommunication in totally closed casing inner chamber and the cylinder, the hand wheel passes through the transmission shaft and sets up on totally closed casing, be equipped with first sealing washer between transmission shaft and the totally closed casing, the initiative helical gear is located totally closed casing and is fixed in on the transmission shaft, totally closed casing is worn out to the sleeve upper end that opens and shuts, sealed cooperation between the outer cylinder wall of the sleeve that opens and shuts and the totally closed casing, the traction screw is located the sleeve that opens and shuts, the conversion block is located the outer cylinder wall of the outer one end of the totally closed casing that stretches out of the sleeve that opens and shuts, sleeve top end face that opens and shuts is equipped with.

In the structure, the driving helical gear, the driven helical gear and the nut opening and closing mechanism are protected by the fully-closed shell, so that the reduction of the service life of parts caused by the loss, drying and deterioration, dust adhesion, dampness and other factors of lubricating grease is effectively prevented, and because the traction screw rod penetrates through the air cylinder to reach the fully-closed shell, the cavity on the upper side of the piston in the air cylinder is directly communicated with the inner cavity of the fully-closed shell, so that the positive pressure can be generated in the fully-closed shell to prevent external water vapor from entering the fully-closed shell no matter whether the piston ascends or descends (the cavity on the upper side of the piston exhausts in a positive pressure manner when the piston ascends and pushes the piston in a pressurization manner when the piston descends).

The utility model discloses further set up to, totally closed casing inner chamber bottom is equipped with down flat face bearing, driven helical gear is arranged in down on the flat face bearing, the sleeve lower extreme that opens and shuts is equipped with the step, the cover has middle spacer sleeve on the sleeve that opens and shuts, it is sealed through the second sealing washer between middle spacer sleeve inner wall and the sleeve outer wall that opens and shuts, middle spacer sleeve is equipped with the bearing plate towards the one end of step, be equipped with flat face bearing on the bearing plate, it is equipped with the axial clearance adjusting collar to go up the flat face bearing top, axial clearance adjusting collar and totally closed casing threaded connection, it is sealed through the third sealing washer between outer cylindrical wall of axial clearance adjusting collar and the totally closed casing, it is sealed through the fourth sealing washer between outer cylindrical wall of inner cylindrical wall of axial clearance adjusting collar and the.

In the structure, the lower plane bearing and the upper plane bearing are used for supporting the driven bevel gear and the opening and closing sleeve, so that the driven bevel gear and the opening and closing sleeve can be kept concentric with the traction screw, the rotation resistance of the driven bevel gear is further reduced, and the fatigue of operators during manual adjustment is reduced.

The utility model discloses further set up to, positive pressure section of thick bamboo top is sealed and is sealing connection with the sleeve that opens and shuts.

In the structure, the sealing at the top of the positive pressure cylinder can ensure the sealing performance of the totally-enclosed shell.

The utility model discloses further set up to, be equipped with on the cylinder with the last gas outlet of piston upside inner chamber intercommunication and with the lower business turn over gas port of piston downside inner chamber intercommunication.

In the structure, the valve body is closed by the piston moving downwards when the upper air inlet and the lower air inlet supply air, and the totally-enclosed shell can be ensured to keep positive pressure in the alternate air supply process when the valve body is opened by the piston moving upwards when the lower air inlet and the lower air outlet supply air.

The utility model discloses further set up to, switch the handle and articulate and be the luffing motion setting on the conversion piece, be equipped with the spacing opening that is used for the block to switch the handle on the spacing seat.

In the above-mentioned structure, when needs switch to manual operation, upwards mention the switching handle, make the switching handle leave the spacing opening of spacing seat, then the circumference rotates the switching handle and makes it drive the conversion piece and rotate, and the conversion piece drives the sleeve that opens and shuts and makes its control split nut separately or combine, will switch the handle and press down after the circumference is adjusted and make its card go into spacing seat another spacing opening in the circumference direction and realize the locking.

The utility model has the advantages that: the driving helical gear, the driven helical gear and the nut opening and closing mechanism are protected by the fully-closed shell, so that the service life of parts is effectively prevented from being reduced due to the fact that lubricating grease runs off, is dried and deteriorated, dust adheres to the lubricating grease, and is affected with damp.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is the schematic diagram of the manual switching mechanism and the cylinder amplifying structure of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2 according to the present invention.

The reference numbers in the figures mean: 10-a valve body; 11-a valve stem; 20-a cylinder; 21-a piston; 22-upper air inlet and outlet; 23-lower inlet and outlet ports; 30-a manual switching mechanism; 31-a hand wheel; 311-a drive shaft; 312 — a first seal ring; 32-driving bevel gear; 33-a driven bevel gear; 34-a conversion block; 35-a switching handle; 36-a limiting seat; 361-limit opening; 37-a totally enclosed housing; 371 — lower plain bearing; 372-upper flat bearing; 40-an opening and closing nut mechanism; 41-split nuts; 42-opening and closing the sleeve; 421-a second sealing ring; 422-step; 43-a traction screw; 44-positive pressure cylinder; 45-intermediate spacer sleeve; 451-a pressure-bearing disc; 46-axial clearance adjustment sleeve; 461-third sealing ring; 462-fourth seal ring.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1 to 3, a pneumatic belt manual switching limiting mechanism parallel double-gate valve as shown in fig. 1 to 3 comprises a valve body 10, a valve rod 11 is arranged on the valve body 10, an air cylinder 20 is arranged above the valve body 10, a manual switching mechanism 30 is arranged above the air cylinder 20, the manual switching mechanism 30 comprises a hand wheel 31, a driving bevel gear 32, a driven bevel gear 33, an opening and closing nut mechanism 40 arranged on the driven bevel gear 33, a conversion block 34, a switching handle 35 and a limiting seat 36, the split nut mechanism 40 comprises a split nut 41 and a split sleeve 42 for controlling the split nut 41 to be opened and closed through rotation, the valve rod 11 penetrates through the lower end face of the cylinder 20 and is connected with a piston 21 in the cylinder 20, the valve rod 11 is in sliding sealing fit with the lower end face of the cylinder 20, the upper end of the valve rod 11 is connected with a traction screw 43, and the traction screw 43 penetrates through the air cylinder 20 and then is matched with the split nut 41; the manual switching mechanism 30 is still including being fixed in the totally closed casing 37 of cylinder 20 top, piston 21 upside cavity intercommunication in totally closed casing 37 inner chamber and the cylinder 20, hand wheel 31 sets up on totally closed casing 37 through transmission shaft 311, be equipped with first sealing washer 312 between transmission shaft 311 and the totally closed casing 37, the initiative helical gear 32 is located totally closed casing 37 and is fixed in on the transmission shaft 311, totally closed casing 37 is worn out to open and shut sleeve 42 upper end, sealed cooperation between the outer cylinder wall of sleeve 42 and the totally closed casing 37 opens and shuts, the traction screw 43 is located the sleeve 42 that opens and shuts, the conversion block 34 is located the outer cylinder wall of the outer one end that totally closed casing 37 was stretched out of sleeve 42 that opens and shuts, sleeve 42 top end face that opens and shuts is equipped with and is used for holding the malleation section of thick.

In the structure, the driving bevel gear 32, the driven bevel gear 33 and the split nut mechanism 40 are protected by the fully-closed shell 37, so that the service life of parts is effectively prevented from being reduced due to the loss of lubricating grease, drying and deterioration, dust adhesion, dampness and other factors, and the service life of the parts is effectively prevented from being reduced, and because the traction screw 43 penetrates through the air cylinder 20 and reaches the fully-closed shell 37, the cavity on the upper side of the piston 21 in the air cylinder 20 is directly communicated with the inner cavity of the fully-closed shell 37, so that no matter the piston 21 ascends or descends (the cavity on the upper side of the piston 21 exhausts at positive pressure and the cavity on the upper side of the piston 21 pushes the piston 21 to push the piston 21 under pressure), positive pressure can be generated in the fully-closed shell 37 to prevent external water vapor from.

In this embodiment, the bottom of the inner cavity of the totally enclosed casing 37 is provided with a lower plane bearing 371, the driven bevel gear 33 is arranged on the lower plane bearing 371, the lower end of the opening-closing sleeve 42 is provided with a step 422 with the diameter larger than the outer diameter of the opening-closing sleeve 42, the opening and closing sleeve 42 is sleeved with a middle isolation sleeve 45, the inner wall of the middle isolation sleeve 45 and the outer wall of the opening and closing sleeve 42 are sealed by a second sealing ring 421, one end of the middle isolation sleeve 45 facing the step 422 is provided with a pressure bearing disc 451, the pressure bearing disc 451 is provided with an upper plane bearing 372, an axial clearance adjusting sleeve 46 is arranged above the upper plane bearing 372, the axial clearance adjusting sleeve 46 is in threaded connection with the totally-enclosed shell 37, the outer cylindrical wall of the axial clearance adjusting sleeve 46 and the totally enclosed casing 37 are sealed by a third sealing ring 461, the inner cylindrical wall of the axial gap adjusting sleeve 46 and the outer cylindrical wall of the intermediate spacer sleeve 45 are sealed by a fourth seal ring 462.

In the above structure, the lower flat bearing 371 and the upper flat bearing 372 are used to support the driven bevel gear 33 and the opening and closing sleeve 42, so that the driven bevel gear 33 and the opening and closing sleeve 42 can be kept concentric with the traction screw 43, thereby further reducing the rotation resistance of the driven bevel gear 33 and reducing the fatigue of an operator during manual adjustment.

In this embodiment, the positive pressure cylinder 44 is sealed at the top and is connected with the opening sleeve 42 in a sealing manner.

In the above structure, the top seal of the positive pressure cylinder 44 can ensure the sealing performance of the totally enclosed shell 37.

In this embodiment, the cylinder 20 is provided with an upper air inlet and outlet 22 communicated with the upper inner cavity of the piston 21 and a lower air inlet and outlet 23 communicated with the lower inner cavity of the piston 21.

In the above structure, the piston moves downwards to close the valve body 10 when the upper air inlet and outlet 22 supplies air, and the piston 21 moves upwards to open the valve body 10 when the lower air inlet and outlet 23 supplies air, so that the totally-enclosed shell 37 can be kept at positive pressure in the alternate air supply process.

In this embodiment, the switching handle 35 is hinged to the conversion block 34 and swings up and down, and the limiting seat 36 is provided with a limiting opening 361 for clamping the switching handle 35.

In the above structure, when the manual operation needs to be switched, the switching handle 35 is lifted upwards, so that the switching handle 35 leaves the limit opening 361 of the limit seat 36, then the switching handle 35 is rotated in the circumferential direction to drive the switching block 34 to rotate, the switching block 34 drives the opening-closing sleeve 42 to control the opening-closing nut 41 to separate or combine, and after the circumferential adjustment is completed, the switching handle 35 is pressed downwards to be clamped into the other limit opening 361 of the limit seat 36 in the circumferential direction to realize locking.

The utility model has the advantages that: the driving bevel gear 32, the driven bevel gear 33 and the split nut mechanism 40 are protected by the fully-closed shell 37, the reduction of the service life of parts caused by the loss, drying and deterioration, dust adhesion, dampness and other factors of lubricating grease is effectively prevented, and because the traction screw 43 penetrates through the air cylinder 20 to reach the fully-closed shell 37, the cavity on the upper side of the piston 21 in the air cylinder 20 is directly communicated with the inner cavity of the fully-closed shell 37, so that no matter the piston 21 moves upwards or downwards (the cavity on the upper side of the piston 21 exhausts air at positive pressure during the ascending, and the cavity on the upper side of the piston 21 pushes the piston 21 to pressurize during the descending), positive pressure can be generated in the fully-closed shell 37 to prevent external water vapor from entering the fully-closed shell 37, and the fully-closed.

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

Claims

1. The utility model provides a parallel double-disc gate valve of stop gear is switched to pneumatic area manual, includes the valve body, be equipped with the valve rod on the valve body, the valve body top is equipped with the cylinder in proper order, the cylinder top is equipped with manual switching mechanism, manual switching mechanism includes hand wheel, initiative helical gear, driven helical gear, sets up nut opening and shutting mechanism, conversion piece, switching handle and spacing seat on the driven helical gear, nut opening and shutting mechanism includes split nut and is used for controlling the sleeve that opens and shuts that split nut opened and shut through rotating, its characterized in that: the valve rod penetrates through the lower end face of the cylinder and is connected with the piston, the valve rod is in sliding sealing fit with the lower end face of the cylinder, the upper end of the valve rod is connected with a traction screw rod, and the traction screw rod penetrates through the cylinder and then is matched with the split nut; the manual switching mechanism is still including the totally closed casing that is fixed in the cylinder top, piston upside cavity intercommunication in totally closed casing inner chamber and the cylinder, the hand wheel passes through the transmission shaft and sets up on totally closed casing, be equipped with first sealing washer between transmission shaft and the totally closed casing, the initiative helical gear is located totally closed casing and is fixed in on the transmission shaft, totally closed casing is worn out to the sleeve upper end that opens and shuts, sealed cooperation between the outer cylinder wall of the sleeve that opens and shuts and the totally closed casing, the traction screw is located the sleeve that opens and shuts, the conversion block is located the outer cylinder wall of the outer one end of the totally closed casing that stretches out of the sleeve that opens and shuts, sleeve top end face that opens and shuts is equipped with.

2. A pneumatic belt manual switching spacing mechanism parallel double gate disc gate valve according to claim 1, characterized in that: the bottom of the inner cavity of the fully-closed shell is provided with a lower plane bearing, the driven helical gear is arranged on the lower plane bearing, the lower end of the opening and closing sleeve is provided with a step, the opening and closing sleeve is sleeved with a middle isolation sleeve, the inner wall of the middle isolation sleeve and the outer wall of the opening and closing sleeve are sealed through a second sealing ring, the middle isolation sleeve is provided with a pressure bearing disc towards one end of the step, the pressure bearing disc is provided with an upper plane bearing, an axial clearance adjusting sleeve is arranged above the upper plane bearing, the axial clearance adjusting sleeve is in threaded connection with the fully-closed shell, the outer cylinder wall of the axial clearance adjusting sleeve and the fully-closed shell are sealed through a third sealing ring, and the inner cylinder wall of the axial clearance adjusting sleeve and the outer.

3. A pneumatic belt manual switching spacing mechanism parallel double gate disc gate valve according to claim 1, characterized in that: the top of the positive pressure cylinder is sealed and is connected with the opening and closing sleeve in a sealing way.

4. A pneumatic belt manual switching spacing mechanism parallel double gate disc gate valve according to claim 1, characterized in that: and an upper air inlet and an upper air outlet communicated with the inner cavity at the upper side of the piston and a lower air inlet and an air outlet communicated with the inner cavity at the lower side of the piston are arranged on the cylinder.

5. A pneumatic belt manual switching spacing mechanism parallel double gate disc gate valve according to claim 1, characterized in that: the switching handle is hinged to the conversion block and arranged in an up-and-down swinging mode, and a limiting opening used for clamping the switching handle is formed in the limiting seat.