CN113309860A

CN113309860A - Sealing reinforcing mechanism of needle valve

Info

Publication number: CN113309860A
Application number: CN202110537476.9A
Authority: CN
Inventors: 张健
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-08-27

Abstract

The invention relates to the technical field of pipeline valves and discloses a sealing and reinforcing mechanism of a needle valve, which comprises a valve body, wherein a feeding port is arranged on the right side of the lower end of the valve body, a discharging port is arranged on the left side of the lower end of the valve body, a movable cavity is arranged in the middle of an inner cavity of the valve body, a handle is movably arranged in the middle of the upper end of the valve body, and a needle rod is movably sleeved in the middle of the movable cavity. According to the invention, the needle bar is pressed down to be in contact with the sealing ring when the needle valve is closed by the sealing opening-preventing mechanism, the threaded rod drives the piston rod to continue to press down, so that liquid in the liquid storage cavity is extruded downwards, the fixture block is pushed outwards by outwards pushing force and is clamped to the inner wall of the valve body, and therefore, the needle bar cannot move upwards after materials flowing from bottom to top impact the lower end of the needle bar and the lower surface of the fixture block, and the problem that the needle bar is forced to open due to overlarge material pressure when the needle valve is in a closed state is avoided.

Description

Sealing reinforcing mechanism of needle valve

Technical Field

The invention relates to the technical field of pipeline valves, in particular to a sealing and reinforcing mechanism of a needle valve.

Background

The needle valve is a valve which can be accurately adjusted, has wide application range, such as cutting distance for flame cutting, and a knob for adjusting flame temperature is the needle valve which has the function of opening or cutting off a pipeline passage.

When traditional needle valve was used, because the decurrent pressure of needle bar is less, make when the material of pan feeding mouth one side upwards applied pressure great, the unable normal phenomenon of closing or the needle bar is backed up by the force to open can appear needle valve, lead to the unable normal condition of controlling the pipeline of needle valve to open and close to take place, and because needle valve is when opening and close, be through needle bar lower extreme and closing plate contact, and then reach the function that the control pipeline opened and close, but when medium circulation and needle bar and sealing washer friction in the valve body, can make needle bar or sealing washer worn and torn, thereby lead to needle valve when sealing, the condition of leaking still can appear, influence the working life of needle valve and the control that the pipeline opened and close.

Disclosure of Invention

Aiming at the defects of the prior needle valve in the use process in the background art, the invention provides a sealing and reinforcing mechanism of the needle valve, which has the advantages of sealing, opening prevention and sealing reinforcement and solves the technical problems of insufficient pressure and abrasion leakage when the needle valve is sealed.

The invention provides the following technical scheme: the utility model provides a closed reinforcing mechanism of needle valve, includes the valve body, the right side of valve body lower extreme is provided with the pan feeding mouth, the left side of valve body lower extreme is provided with the discharge gate, valve body inner chamber middle part is provided with movable chamber, the middle part movable mounting in valve body upper end has the handle, the middle part activity in activity chamber has cup jointed the needle bar, the piston rod has been cup jointed in the activity of needle bar inner chamber, threaded rod swing joint is passed through at piston rod upper end and handle middle part, the needle bar inner chamber is provided with the stock solution chamber that is located the piston rod below, the inner chamber activity of needle bar lower extreme has cup jointed the fixture block, and stock solution chamber and the cavity middle part intercommunication that the fixture block located, the lower extreme fixed mounting in activity chamber has the sealing washer, the recess that is located the sealing washer below is seted up to the inner chamber of valve body, and the recess height is greater than the height of fixture block.

Preferably, the intercommunicating pore has been seted up at discharge gate and activity chamber middle part, the inner chamber fixedly connected with in activity chamber is located the pressure boost piece of sealing washer top, the limiting plate that is located pressure boost piece below has been cup jointed in the inner chamber activity in activity chamber, the inboard of limiting plate and the outside contact of sealing washer, the inboard of limiting plate is the inclined plane form, and the outside of limiting plate is the ratchet form.

Preferably, the movable block positioned in the groove is movably mounted in the inner cavity of the movable cavity, the opening and closing cavity positioned on the outer side of the movable block is formed in the inner side of the lower end of the valve body, the opening and closing plate positioned below the discharge port and the sealing ring communication hole is movably sleeved on the inner side of the lower end of the valve body, and the lower end of the opening and closing plate is movably connected with the bottom surface of the opening and closing cavity through a spring.

Preferably, the length of the opening and closing plate is smaller than the height of the discharge hole and the height of the sealing ring communication hole.

Preferably, the lower end of the outer side of the clamping block is provided with a right-angled triangular hole, and the vertical surface is located on the outermost side.

The invention has the following beneficial effects:

1. according to the invention, the needle bar is pressed down to be in contact with the sealing ring when the needle valve is closed by the sealing opening-preventing mechanism, the threaded rod drives the piston rod to continue to press down, so that liquid in the liquid storage cavity is extruded downwards, the fixture block is pushed outwards by outwards pushing force and is clamped to the inner wall of the valve body, and therefore, the needle bar cannot move upwards after materials flowing from bottom to top impact the lower end of the needle bar and the lower surface of the fixture block, and the problem that the needle bar is forced to open due to overlarge material pressure when the needle valve is in a closed state is avoided.

2. According to the needle valve, the reinforced sealing mechanism is arranged, so that when the needle valve is closed, materials in a cavity at the upper end of the needle rod are increased continuously through the materials leaked from the gap between the needle rod and the sealing ring, the pressurizing block moves downwards under the action of smaller pressure at the lower end under the action of continuously increased pressure, and the sealing ring is pressed inwards under the action of the inclined surface at the inner side of the pressurizing block, so that the sealing ring moves inwards continuously, the sealing ring is in closer contact with the lower end of the needle rod, and the sealing efficiency of the needle valve is improved.

3. According to the invention, the auxiliary opening and closing mechanism is arranged, so that when the closed opening-preventing mechanism normally works, the movable block is pushed outwards by the clamping block moving outwards, so that liquid in the opening and closing cavity moves towards the lower end of the opening and closing plate and is pushed upwards by overcoming the elastic force of the spring, the hole diameters of the discharge hole and the movable cavity communicating hole are reduced, the discharge efficiency of materials can be reduced by the auxiliary opening and closing mechanism when the reinforced sealing mechanism normally works and the leaked materials are less, the materials in the movable cavity are increased continuously, the pressure in the movable cavity can reach the closed pressure of the reinforced sealing mechanism quickly, and the application range of the reinforced sealing mechanism is ensured.

Drawings

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

FIG. 2 is a schematic structural diagram of the working state of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2 according to the present invention.

In the figure: 1. a valve body; 2. a needle bar; 3. a handle; 4. a threaded rod; 5. a movable cavity; 6. a piston rod; 7. a liquid storage cavity; 8. a clamping block; 9. a movable block; 10. opening and closing the cavity; 11. a spring; 12. a shutter plate; 13. a discharge port; 14. a feeding port; 15. a seal ring; 16. a pressure increasing block; 17. and a limiting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a closed reinforcing mechanism of a needle valve comprises a valve body 1, a feeding port 14 is arranged on the right side of the lower end of the valve body 1, a discharging port 13 is arranged on the left side of the lower end of the valve body 1, a movable cavity 5 is arranged in the middle of the inner cavity of the valve body 1, a handle 3 is movably arranged in the middle of the upper end of the valve body 1, a needle rod 2 is movably sleeved in the middle of the movable cavity 5, a piston rod 6 is movably sleeved in the inner cavity of the needle rod 2, the side surface of the upper end of the piston rod 6 is in a cross shape, so that the piston rod 6 cannot rotate when moving up and down, the up and down moving efficiency of the piston rod 6 is guaranteed, the upper end of the piston rod 6 is movably connected with the middle of the handle 3 through a threaded rod 4, a liquid storage cavity 7 located below, the hydraulic oil in the liquid storage cavity 7 is moved, when the piston rod 6 moves upwards, negative pressure is formed in the liquid storage cavity 7, the hydraulic oil moves upwards, the fixture block 8 is movably sleeved in the inner cavity at the lower end of the needle rod 2, the liquid storage cavity 7 is communicated with the middle of the cavity where the fixture block 8 is located, when the needle valve is closed, the lower end of the needle rod 2 moves to be blocked, the threaded rod 4 moves downwards and is converted into pushing the piston rod 6 to move downwards, the hydraulic oil in the liquid storage cavity 7 is extruded to the middle of the fixture block 8, the fixture block 8 is pushed outwards under the action of hydraulic pressure, the fixture block 8 is guaranteed to extend outwards at a relative fixed position all the time, the sealing ring 15 is fixedly arranged at the lower end of the movable cavity 5, the groove below the sealing ring 15 is formed in the inner cavity of the valve body 1, the height of the groove is larger than that of the fixture block 8, and the sealing ring 15 limits the needle rod 2 to move downwards, after the clamping block 8 extends outwards, the clamping block can be just clamped in the groove, so that the position of the needle rod 2 can be limited through the clamping block 8 after the clamping block 8 receives upward large thrust, and the situation that the needle valve is automatically opened due to overlarge pressure is prevented.

Wherein, the middle parts of the discharge port 13 and the movable cavity 5 are provided with communicating holes, the inner cavity of the movable cavity 5 is fixedly connected with a pressurizing block 16 positioned above the sealing ring 15, the inner cavity of the movable cavity 5 is movably sleeved with a limiting plate 17 positioned below the pressurizing block 16, by arranging the pressurizing block 16, when the needle valve is in an opening state, under the action of Bernoulli principle, the negative pressure suction generated by the rapid circulation of materials can limit the limiting plate 17 by the pressurizing block 16 after the limiting plate 17 moves upwards, so that the limiting plate 17 is always in a relatively fixed position, and the inner cavity of the limiting plate 17 is wider relative to the pressurizing block 16, so that under the action of the continuous increase of the pressure in the movable cavity 5, the inner side of the limiting plate 17 can generate downward pressure to move downwards, so that the enhanced sealing mechanism works normally, the inner side of the limiting plate 17 is contacted with the outer side of the sealing ring 15, the inboard of limiting plate 17 is the inclined plane form, make after limiting plate 17 moves down, can produce the inside extruded power to sealing washer 15, and then make the inboard power increase when contacting with the needle bar 2 lower extreme of sealing washer 15, thereby strengthen the sealed efficiency between the two, and the outside of limiting plate 17 is the ratchet form, make when the needle valve is in the encapsulated situation, after limiting plate 17 moves down the certain distance, can be through the outside thrust of needle bar 2 lower extreme and the inboard pressure of limiting plate 17 and the produced pressure when sealing washer 15 automatic recovery, make the limiting plate 17 outside produce great frictional force, thereby make limiting plate 17 when the encapsulated situation, its position can not change, thereby guaranteed the lasting sealing capacity of reinforcing sealing mechanism.

Wherein, the movable block 9 in the groove is movably installed in the inner cavity of the movable cavity 5, so that when the closed opening-proof mechanism normally works, the clamping block 8 is clamped in the groove, the movable block 9 can be just pushed to the outside, the opening-closing cavity 10 outside the movable block 9 is arranged on the inner side of the lower end of the valve body 1, the opening-closing cavity 10 is filled with hydraulic oil, so that after the movable block 9 is pushed to the outside, the hydraulic oil in the opening-closing cavity 10 can move to the outside, the opening-closing plate 12 below the discharge port 13 and the communicating hole of the sealing ring 15 is movably sleeved on the inner side of the lower end of the valve body 1, so that after the hydraulic oil in the opening-closing cavity 10 moves to the outside, the opening-closing plate 12 can be pushed upwards under the action of liquid pressure, thereby the discharge port 13 and the communicating hole staggered closed part of the movable cavity 5, the lower end of the opening-closing plate 12, the opening and closing plate 12 can be always positioned at the lower end of the opening and closing cavity 10 under the action of the spring 11 and the material pressure in the communicating hole, so that the situation that the auxiliary opening and closing mechanism is automatically started to influence the material circulation efficiency due to overlarge material pressure is avoided.

Wherein, the length of opening and close board 12 is less than the height of discharge gate 13 and sealing washer 15 intercommunicating pore for after opening and close board 12 outwards stretches out completely, there is still the clearance in the intercommunicating pore between discharge gate 13 and the activity chamber 5, thereby has further avoided supplementary starting and shutting mechanism automatic start, influences the condition emergence of material flow efficiency.

Wherein, the hole that is right triangle is seted up to 8 outside lower extremes of fixture block, and vertical face is located the outside for when closing and preventing opening mechanism normal work, can be through the impact of material to 8 bottom surfaces of fixture block and trompil, make the power that 8 clamping blocks stretched out outside be greater than inside thrust all the time, thereby further ensured to close and prevented opening mechanism's work efficiency.

The using method of the invention is as follows: the needle valve is arranged at a proper position of a pipeline, the material inlet 14 and the material outlet 13 are respectively connected with the material inlet and the material outlet, and then the needle valve can move up and down by the clockwise or anticlockwise bagging handle 3 under the matching of the threaded rod 4, so that the opening and closing of the needle valve are controlled;

sealing and opening prevention: when the needle valve is closed, the needle rod 2 is pressed down to be in contact with the sealing ring 15, the threaded rod 4 drives the piston rod 6 to continue to press down, so that liquid in the liquid storage cavity 7 is extruded downwards, the fixture block 8 is pushed outwards and extends outwards, the fixture block 8 is clamped into a groove in the inner wall of the valve body 1, and materials flowing from bottom to top cannot move upwards no matter how large the pressure is;

enhancing sealing: when the needle valve is closed, the material leaked from the gap between the needle rod 2 and the sealing ring 15 continuously increases the material in the cavity at the upper end of the needle rod 2, the pressurizing block 16 moves downwards under the action of lower pressure under the action of continuously increasing pressure, the position of the pressurizing block is prevented from floating upwards under the action of the ratchet at the outer side of the limiting plate 17, the sealing ring 15 is pressed inwards under the action of the inclined plane at the inner side of the pressurizing block 16, the sealing ring 15 continuously moves inwards, and the sealing ring 15 is in close contact with the lower end of the needle rod 2, so that the material is prevented from leaking;

auxiliary opening and closing: when the sealing opening-preventing mechanism normally works, the movable block 9 is pushed outwards by the fixture block 8 moving outwards, so that liquid in the opening-closing cavity 10 moves towards the lower end of the opening-closing plate 12, the elastic force of the spring 11 is overcome to jack the movable block upwards, the aperture of the communicating hole of the discharge hole 13 and the aperture of the communicating hole of the movable cavity 5 are reduced, the sealing mechanism is enhanced to normally work, when the leaked materials are less, the discharge efficiency of the materials can be reduced by the aid of the opening-closing mechanism, the materials in the movable cavity 5 are increased continuously, and the pressure in the movable cavity 5 can quickly reach the sealing pressure of the enhanced sealing mechanism.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a needle valve's closed reinforcing mechanism, includes valve body (1), the right side of valve body (1) lower extreme is provided with pan feeding mouth (14), the left side of valve body (1) lower extreme is provided with discharge gate (13), its characterized in that: a movable cavity (5) is arranged in the middle of the inner cavity of the valve body (1), a handle (3) is movably arranged in the middle of the upper end of the valve body (1), the middle part of the movable cavity (5) is movably sleeved with a needle rod (2), the inner cavity of the needle rod (2) is movably sleeved with a piston rod (6), the upper end of the piston rod (6) is movably connected with the middle part of the handle (3) through a threaded rod (4), the inner cavity of the needle rod (2) is provided with a liquid storage cavity (7) positioned below the piston rod (6), the inner cavity at the lower end of the needle rod (2) is movably sleeved with a clamping block (8), the liquid storage cavity (7) is communicated with the middle part of the cavity where the clamping block (8) is positioned, the lower end of the movable cavity (5) is fixedly provided with a sealing ring (15), the inner cavity of the valve body (1) is provided with a groove positioned below the sealing ring (15), and the height of the groove is greater than that of the clamping block (8).

2. The needle valve closure enhancement mechanism of claim 1, wherein: discharge gate (13) and activity chamber (5) middle part have seted up the intercommunicating pore, the inner chamber fixedly connected with in activity chamber (5) is located booster block (16) of sealing washer (15) top, limiting plate (17) that are located booster block (16) below have been cup jointed in the inner chamber activity in activity chamber (5), the inboard of limiting plate (17) and the outside contact of sealing washer (15), the inboard of limiting plate (17) is the inclined plane form, and the outside of limiting plate (17) is the ratchet form.

3. The needle valve closure enhancement mechanism of claim 1, wherein: the movable cavity (5) inner chamber movable mounting has movable block (9) that is located the recess, open and close chamber (10) that are located the movable block (9) outside are seted up to valve body (1) lower extreme inboard, the inboard activity of valve body (1) lower extreme has cup jointed and has been located discharge gate (13) and sealing washer (15) intercommunicating pore below open and close board (12), open and close board (12) lower extreme and open and close chamber (10) underrun through spring (11) swing joint.

4. A needle valve closure enhancement mechanism according to claim 3, wherein: the length of the opening and closing plate (12) is less than the height of the communicating hole of the discharge hole (13) and the sealing ring (15).

5. The needle valve closure enhancement mechanism of claim 1, wherein: the lower end of the outer side of the clamping block (8) is provided with a hole in the shape of a right triangle, and the vertical surface is located on the outermost side.