CN112145760A

CN112145760A - Check valve

Info

Publication number: CN112145760A
Application number: CN202010905603.1A
Authority: CN
Inventors: 苏道飞; 郭君栋; 周景玲
Original assignee: Jinan Dechuang Test Instrument Co ltd
Current assignee: Jinan Dechuang Test Instrument Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2020-12-29

Abstract

The invention discloses a check valve, which comprises a valve body and a valve cover arranged at the upper end of the middle part of the valve body, wherein an inlet flow passage, a middle cavity and an outlet flow passage are arranged in the valve body, a valve seat is arranged at the outlet end of the inlet flow passage in the valve body, a fluid passage communicated with the inlet flow passage is arranged on the valve seat, a valve clack matched with the valve seat is arranged in the valve body, and the check valve also comprises a valve clack buffering mechanism which is connected with the valve body and is used for slowing down the descending speed of the valve clack when a medium at the inlet side of the valve. The invention has the advantages that: when the import side medium breaks off suddenly, the valve clack moves down and through rack drive ratchet, constantly compresses the second torsional spring during ratchet rotates for the second torsional spring forms the resistance to the decline of valve clack, and the falling speed of valve clack slows down, reduces the impact force of valve clack to the disk seat, makes the sealed face between valve clack and the disk seat not fragile, improves life, noise reduction.

Description

Check valve

Technical Field

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

Background

The check valve refers to and relies on medium itself to flow and automatic opening, close the valve clack for prevent the valve of medium refluence, and the check valve belongs to an automatic valve, and its main function prevents the medium refluence, prevents pump and driving motor reversal to and the releasing of container medium, and the check valve divide into two kinds of lift check valve and swing check valve, and current lift check valve mainly includes: the valve body, the disk seat, the valve clack, uide bushing and valve gap, be equipped with the inlet flow way in the valve body, export flow way and lumen, be equipped with the disk seat at the inlet flow way exit end, the disk seat upper end is equipped with the disk seat sealed face, the valve gap is installed in valve body middle part upper end, uide bushing upper end fixed mounting is between valve body and valve gap, the uide bushing lower extreme stretches into the lumen, the valve clack sets up inside the uide bushing, the valve clack excircle forms upper and lower direction with the uide bushing inner wall, the valve clack lower extreme is equipped with can form with the disk seat sealed face and opens, the valve clack sealed face of closing the valve, the uide bushing upper end is equipped with: the valve clack is opening the in-process, and when valve body import side medium was interrupted suddenly, the valve clack is closed downwards fast under the effect of valve body outlet side medium, and the valve clack sealing surface forms a great impact force to the sealed face of valve seat, and the sealed face of valve clack receives destruction easily with the sealed face of valve seat, influences life, and the noise is big simultaneously.

Disclosure of Invention

In view of the above, there is a need to provide an anti-impact check valve that has a long service life and low noise, wherein the valve flap is slowly closed downward when the medium on the inlet side of the valve is suddenly interrupted, so that the impact force of the sealing surface of the valve flap on the sealing surface of the valve seat is small.

The invention discloses a check valve, which comprises a valve body and a valve cover arranged at the upper end of the middle part of the valve body, wherein an inlet flow passage, a middle cavity and an outlet flow passage are arranged in the valve body, a valve seat is arranged at the outlet end of the inlet flow passage in the valve body, a fluid passage communicated with the inlet flow passage is arranged on the valve seat, a valve clack matched with the valve seat is arranged in the valve body, the check valve also comprises a valve clack buffering mechanism used for slowing down the descending speed of the valve clack when a medium at the inlet side of the valve body is suddenly interrupted, and the valve clack buffering mechanism comprises: the guide rod is fixed on the valve cover and is positioned in the middle cavity; the plunger rod is fixed on the valve clack and positioned in the middle cavity, the plunger rod is sequentially divided into a lower plunger section, a guide section, a middle plunger section and an upper plunger section from bottom to top, the top surface of the upper plunger section is provided with a sliding groove in sliding connection with the guide rod, and the outer side surface of the upper plunger section is provided with a rack; one end of the swing rod is rotatably connected to the inner side wall of the middle cavity, the other end of the swing rod is fixedly connected with a rotating shaft, a first torsion spring is arranged between the swing rod and the inner side wall of the middle cavity, and one end of the swing rod, which is close to the rotating shaft, is fixedly connected with a rotation stopping pin; the ratchet wheel is rotationally connected to the rotating shaft and is used for meshing with the rack, an arc-shaped groove in sliding connection with the rotation stopping pin is formed in the side face of the ratchet wheel, a second torsion spring is arranged between the ratchet wheel and the rotating shaft, the rack can be driven to move downwards through downward movement of the valve clack, and the ratchet wheel is driven to rotate anticlockwise so as to be compressed; the installation seat is fixedly connected to the inner side wall of the middle cavity, a push rod is connected to the installation seat in a sliding mode, one end of the push rod is in contact with the outer side face of the plunger rod, the other end of the push rod is used for pushing the swing rod, the push rod can be driven to be in contact with the outer side face of the middle plunger section through downward movement of the valve clack, and then the push rod is driven to push the swing rod to swing rightwards, so that the ratchet wheel is disengaged from the rack.

In one embodiment, a guide groove is formed in the inner wall of the sliding groove, a guide block is embedded on the guide rod, and the guide block is slidably arranged in the guide groove to ensure that the valve clack vertically moves.

In one embodiment, the width of the lower plunger section is smaller than that of the middle plunger section, the width of the upper end of the guide section is the same as that of the middle plunger section, and the width of the lower end of the guide section is the same as that of the lower plunger section.

In one embodiment, the first torsion spring is in a natural state when the ratchet is engaged with the rack.

The technical scheme has the advantages that:

1. when the medium on the inlet side of the inlet flow passage is suddenly interrupted, the valve clack moves downwards and drives the ratchet wheel to rotate through the rack, the ratchet wheel continuously compresses the second torsion spring during rotation, and the continuously compressed second torsion spring forms resistance to the descending of the valve clack, so that the descending speed of the valve clack is slowed down, the impact force of the valve clack on the valve seat is reduced, the sealing surface between the valve clack and the valve seat is not easily damaged, the service life is prolonged, and the noise is reduced.

2. When the valve clack is closed in place, the push rod is in contact with the middle plunger section of the valve clack, so that the push rod pushes the swing rod to swing, the rack is disengaged from the ratchet wheel, the ratchet wheel rotates back to the initial position under the action of the second torsion spring, the valve clack is not influenced by the acting force of the second torsion spring when being completely closed, and the valve clack can be reliably closed and sealed.

3. When the valve clack is opened, the rack can not drive the ratchet wheel to rotate due to the action of the rotation stopping pin, and the valve clack can be quickly opened.

4. The invention has simple and reasonable structure and low manufacturing cost.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the invention with the valve flap in a closed position;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a view showing the construction of the present invention with the valve flap opened;

FIG. 4 is a view of the valve flap of the present invention moving from the open position to the closed position;

fig. 5 is an enlarged view at B in fig. 4.

In the figure, a valve body 1, an inlet flow passage 101, an outlet flow passage 102, a middle cavity 103, a valve cover 2, a guide rod 21, a guide block 211, a valve clack 3, an upper plunger section 31, a guide groove 311, a rack 312, a sliding groove 313, an intermediate plunger section 32, a guide section 33, a lower plunger section 34, a ratchet 4, an arc-shaped groove 41, a first torsion spring 5, a swing rod 6, a rotation stopping pin 61, a valve seat 7, a fluid passage 71, a second torsion spring 8, a rotating shaft 9, a mounting seat 10 and a push rod 11.

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.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The invention discloses a check valve, as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, comprising a valve body 1 and a valve cover 2 arranged at the upper end of the middle part of the valve body 1, wherein an inlet flow passage 101, a middle cavity 103 and an outlet flow passage 102 are arranged in the valve body 1, a valve seat 7 is arranged at the outlet end of the inlet flow passage 101 in the valve body 1, a fluid passage 71 communicated with the inlet flow passage 101 is arranged on the valve seat 7, a valve flap 3 matched with the valve seat 7 is arranged in the valve body 1, the check valve further comprises a valve flap buffering mechanism for slowing down the descending speed of the valve flap 3 when a medium at the inlet side of the valve body 1 is suddenly interrupted, and the valve flap buffering mechanism comprises: a guide rod 21 fixed to the bonnet 2 and located inside the middle chamber 103; the plunger rod is fixed on the valve clack 3 and positioned in the middle cavity 103, the plunger rod is sequentially divided into a lower plunger section 34, a guide section 33, a middle plunger section 32 and an upper plunger section 31 from bottom to top, the top surface of the upper plunger section 31 is provided with a sliding groove 313 in sliding connection with the guide rod 21, and the outer side surface of the upper plunger section 31 is provided with a rack 312; one end of the swing rod 6 is rotatably connected to the inner side wall of the middle cavity 103, the other end of the swing rod is fixedly connected with a rotating shaft 9, a first torsion spring 5 is arranged between the swing rod 6 and the inner side wall of the middle cavity 103, and one end, close to the rotating shaft 9, of the swing rod 6 is fixedly connected with a rotation stopping pin 61; the ratchet wheel 4 is rotatably connected to the rotating shaft 9 and is used for meshing with the rack 312, an arc-shaped groove 41 in sliding connection with the rotation stopping pin 61 is formed in the side surface of the ratchet wheel 4, a second torsion spring 8 is arranged between the ratchet wheel 4 and the rotating shaft 9, the second torsion spring can drive the rack 312 to move downwards by the downward movement of the valve clack 3, and further the ratchet wheel 4 is driven to rotate anticlockwise so as to compress the second torsion spring 8; the mounting seat 10 is fixedly connected to the inner side wall of the middle cavity 103, a push rod 11 is connected to the mounting seat 10 in a sliding mode, one end of the push rod 11 is in contact with the outer side face of the plunger rod, the other end of the push rod 11 is used for pushing the swing rod 6, the push rod 11 can be driven to be in contact with the outer side face of the middle plunger section 32 through downward movement of the valve clack 3, the push rod 11 is further driven to push the swing rod 6 to swing rightwards, and therefore the ratchet wheel 4 is disengaged from the rack 312.

It should be noted that the lower side surface of the teeth on the rack 312 is a vertical surface, the upper side surface is an inclined surface, the lower side surface is meshed with the ratchet wheel 4, the ratchet wheel 4 can be driven to rotate, and when the upper side surface is abutted against the ratchet wheel 4, the ratchet wheel 4 is pushed to move in a direction away from the rack 312, and the ratchet wheel 4 is not driven to rotate. Further, by providing the rotation stop pin 61, when the rack 312 is raised, the ratchet 4 can be restricted from rotating clockwise.

It should be noted that, as shown in fig. 2 and 5, the rotating shaft 9 and the arc-shaped groove 41 are concentrically arranged.

It should be noted that as shown in fig. 1, fig. 2, and fig. 3, when the valve flap 3 moves upward, the ratchet 4 and the rack 312 are in a meshed state to drive the ratchet 4 to rotate clockwise, at this time, the rotation stop pin 61 is located at the right end of the arc-shaped groove 41, the ratchet 4 does not rotate, and the teeth of the rack 312 and the ratchet teeth of the ratchet 4 drive the swing rod 6 to swing under the matching action, so as to achieve rapid opening of the valve flap 3.

Preferably, as shown in fig. 1 and 3, a guide groove 311 is formed in an inner wall of the sliding groove 313, a guide block 211 is embedded on the guide rod 21, and the guide block 211 is slidably disposed in the guide groove 311 to ensure that the valve flap 3 vertically moves.

Preferably, as shown in fig. 3, the width of the lower plunger section 34 is smaller than that of the middle plunger section 32, the width of the upper end of the guide section 33 is the same as that of the middle plunger section 32, and the width of the lower end of the guide section 33 is the same as that of the lower plunger section 34.

Preferably, as shown in fig. 3 and 5, when the ratchet 4 is engaged with the rack 312, the first torsion spring 5 is in a natural state.

It can be understood that, as shown in fig. 1 and 3, when the swing link 6 is rotated to the right, the first torsion spring 5 can be compressed.

The working mode of the invention is as follows:

when fluid flows in from the inlet channel 101, acting force is generated on the bottom surface of the valve clack 3 through the fluid channel 71 to drive the valve clack 3 to move upwards, the push rod 11 is changed from being in contact with the middle plunger section 32 in fig. 1 to being in contact with the lower plunger section 34 in fig. 3, namely, the push rod 11 moves towards one side far away from the swing rod 6, and under the acting force of the first torsion spring 5, the ratchet of the ratchet wheel 4 is meshed with the rack 312, but the rotation stopping pin 61 is positioned at the right end of the arc-shaped groove 41 at the moment, the ratchet wheel 4 does not rotate when the valve clack 2 moves upwards due to the blocking of the rotation stopping pin 61, but the swing rod 6 is driven to swing under the action of the teeth of the rack 312, and at the moment, the resistance on the plug rod is;

when the fluid in the inlet channel 101 is suddenly interrupted, the valve flap 3 moves downwards under the impact force generated by the self gravity, the medium pressure in the outlet channel 102 and the backflow, when the valve flap 3 moves downwards, the ratchet 4 is driven to rotate anticlockwise through the meshing of the rack 312 and the ratchet 4, the ratchet 4 compresses the second torsion spring 8 when rotating anticlockwise, the valve flap 3 moves downwards, the compression amount of the second torsion spring 8 is larger, the resistance when the valve flap 3 is closed is larger and larger, the valve flap 3 is driven to close slowly, so that the impact force is reduced, when the valve flap 3 is to be closed in place, as shown in fig. 1, the push rod 11 is contacted with the middle plunger section 32, the push rod 11 pushes the swing rod 6 to swing rightwards, the ratchet 4 is disengaged from the rack 312, and the ratchet 4 rotates to the initial position under the acting force of the second torsion spring 8, so that the valve flap 3 is not subjected to the acting force of the second torsion spring 8 when being closed, the valve can be reliably closed and sealed, and the valve clack 3 can compress the second torsion spring 8 when being closed next time to play a role in slowing down the closing speed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a check valve, include the valve body with set up in the valve gap of valve body middle part upper end, be provided with inlet flow way, lumen and outlet flow way in the valve body, be located in the valve body inlet flow way's exit end is provided with the disk seat, set up on the disk seat with the fluid passage that inlet flow way communicates each other, be provided with in the valve body with the valve clack that the disk seat was mutually supported, its characterized in that, check valve still include valve clack buffer gear, be used for slow down when the inlet side medium of valve body breaks suddenly the falling velocity of valve clack, valve clack buffer gear includes:

the guide rod is fixed on the valve cover and is positioned in the middle cavity;

the plunger rod is fixed on the valve clack and positioned in the middle cavity, the plunger rod is sequentially divided into a lower plunger section, a guide section, a middle plunger section and an upper plunger section from bottom to top, the top surface of the upper plunger section is provided with a sliding groove in sliding connection with the guide rod, and the outer side surface of the upper plunger section is provided with a rack;

one end of the swing rod is rotatably connected to the inner side wall of the middle cavity, the other end of the swing rod is fixedly connected with a rotating shaft, a first torsion spring is arranged between the swing rod and the inner side wall of the middle cavity, and one end of the swing rod, which is close to the rotating shaft, is fixedly connected with a rotation stopping pin;

the ratchet wheel is rotationally connected to the rotating shaft and is used for meshing with the rack, an arc-shaped groove in sliding connection with the rotation stopping pin is formed in the side face of the ratchet wheel, a second torsion spring is arranged between the ratchet wheel and the rotating shaft, the rack can be driven to move downwards through downward movement of the valve clack, and the ratchet wheel is driven to rotate anticlockwise so as to be compressed;

the installation seat is fixedly connected to the inner side wall of the middle cavity, a push rod is connected to the installation seat in a sliding mode, one end of the push rod is in contact with the outer side face of the plunger rod, the other end of the push rod is used for pushing the swing rod, the push rod can be driven to be in contact with the outer side face of the middle plunger section through downward movement of the valve clack, and then the push rod is driven to push the swing rod to swing rightwards, so that the ratchet wheel is disengaged from the rack.

2. The check valve of claim 1, wherein the inner wall of the sliding groove is provided with a guide groove, the guide rod is embedded with a guide block, and the guide block is slidably arranged in the guide groove to ensure that the valve clack vertically moves.

3. The check valve of claim 1, wherein the lower plunger section has a width less than a width of the intermediate plunger section, the guide section has an upper end width that is the same as the width of the intermediate plunger section, and the guide section has a lower end width that is the same as the width of the lower plunger section.

4. The check valve of claim 1, wherein the first torsion spring is in a natural state when the ratchet is engaged with the rack.