CN111173968B - Check valve - Google Patents

Check valve Download PDF

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Publication number
CN111173968B
CN111173968B CN202010079486.8A CN202010079486A CN111173968B CN 111173968 B CN111173968 B CN 111173968B CN 202010079486 A CN202010079486 A CN 202010079486A CN 111173968 B CN111173968 B CN 111173968B
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CN
China
Prior art keywords
valve
cavity
port
rotating shaft
rod
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Application number
CN202010079486.8A
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Chinese (zh)
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CN111173968A (en
Inventor
邵立坤
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Zhejiang Oufei Petroleum Equipment Co ltd
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Zhejiang Oufei Petroleum Equipment Co ltd
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Priority to CN202010079486.8A priority Critical patent/CN111173968B/en
Publication of CN111173968A publication Critical patent/CN111173968A/en
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Publication of CN111173968B publication Critical patent/CN111173968B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0218—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with only one sealing face
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
    • F16K3/06—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/32—Means for additional adjustment of the rate of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)

Abstract

The invention discloses a check valve which comprises a valve body, wherein an upper valve cavity and a lower valve cavity are arranged in the valve body; the side surface of the valve body is provided with a port B communicated with the upper valve cavity and a port A communicated with the lower valve cavity; the valve body is fixedly provided with an upper end cover at an upper end opening of the upper valve cavity and a lower end cover at a lower end opening of the lower valve cavity; a rotating shaft is rotatably connected in the lower valve cavity; the lower end cover is provided with a first baffle and a second baffle; the first baffle and the second baffle divide the lower valve cavity into a first sealing cavity and a second cavity communicated with the port A, and a power plate extending into the first sealing cavity is arranged on the circumferential side surface of the rotating shaft; the upper end cover is provided with a flow regulating assembly; a buffer component is arranged in the upper valve cavity; the check valve is simple in structure, can control flow, and can realize slow closing of the valve port.

Description

Check valve
Technical Field
The invention belongs to the technical field of pipeline valves, and particularly relates to a check valve.
Background
Check valves are a type of valve commonly used in plumbing systems. The check valve is used for communicating fluid media in a check pipeline system, is widely applied to industrial equipment, and easily generates too high closing speed in the rotating closing process of the valve clack around a pin shaft, so that the impact force of the sealing surface of the valve clack to the sealing surface of a valve seat is too large, and the valve clack is easily damaged; meanwhile, when the check valve clack is closed quickly, water hammer is easy to generate, and the damage conditions such as damage to the valve are caused; and it can generally use with the flow valve when using, because the valve is various, requires to have great installation space, and traditional check valve has can't satisfy present operating mode's needs.
Disclosure of Invention
The invention aims to provide a check valve which is simple in structure, can control flow and can realize slow closing of a valve port.
In order to achieve the purpose, the invention provides the following technical scheme:
a check valve comprises a valve body, wherein an upper valve cavity and a lower valve cavity are arranged in the valve body, and a valve port used for communicating the upper valve cavity and the lower valve cavity is arranged in the valve body; the side surface of the valve body is provided with a port B communicated with the upper valve cavity and a port A communicated with the lower valve cavity; the valve body is fixedly provided with an upper end cover at an upper end opening of the upper valve cavity and a lower end cover at a lower end opening of the lower valve cavity;
a rotating shaft is rotatably connected between the lower end cover and the top of the lower valve cavity in the lower valve cavity, and the rotating shaft and the lower valve cavity are coaxially arranged; the lower end cover is provided with a first baffle plate and a second baffle plate which extend upwards along the vertical direction on the surface facing the lower valve cavity, and the upper ends of the first baffle plate and the second baffle plate are hermetically connected with the top of the lower valve cavity; the side surface of the first baffle plate and the side surface of the second baffle plate, which is far away from the rotating shaft, are in sealing connection with the inner circumferential side wall of the lower valve cavity, and the side surface of the first baffle plate, which is close to the rotating shaft, is in sliding sealing connection with the rotating shaft; the first baffle and the second baffle divide the lower valve cavity into a first sealed cavity and a second cavity communicated with the port A, a power plate extending into the first sealed cavity is arranged on the circumferential side surface of the rotating shaft, the power plate divides the first sealed cavity into a third cavity and a fourth cavity, the third cavity is communicated with the second cavity, and the fourth cavity is communicated with the port B; the circumferential side surface of the rotating shaft close to the upper end of the rotating shaft is provided with a valve clack for controlling the on-off of the valve port, when the power plate is close to the first baffle plate, the valve clack closes the valve port, and when the power plate is close to the second baffle plate, the valve clack completely opens the valve port; the upper end cover is provided with a flow regulating component, and the flow regulating component is used for controlling the valve clack to open the valve port; and a buffer component is arranged in the upper valve cavity and used for controlling the valve clack to slowly close the valve port.
In a further technical scheme, a first through hole used for communicating the third chamber and the second chamber is formed in the rotating shaft, and second through holes which are connected end to end and used for communicating the fourth chamber and the port B are sequentially formed in the rotating shaft, the lower end cover and the valve body.
In a further technical scheme, the flow regulating assembly comprises a valve rod and a connecting rod, the valve rod is rotatably connected to the upper end cover, and the lower end of the valve rod extends into the lower valve cavity and is fixedly connected with the upper end of the rotating shaft; the upper end of the valve rod extends out of the upper end cover, a through sliding hole is formed in the side face, close to the upper end, of the valve rod along the radial direction of the valve rod, the connecting rod is connected in the sliding hole in a sliding mode, a plurality of positioning holes are uniformly formed in the connecting rod along the length direction of the connecting rod at intervals, and the upper end of the valve rod is detachably connected with positioning bolts penetrating through the positioning holes in a threaded mode; the upper end cover is provided with a limiting groove along the radial direction of the valve rod by taking the valve rod as a center, and a plurality of arc-shaped grooves which correspond to the positioning holes one by one and have different arc lengths, the left end of each arc-shaped groove is communicated with the limiting groove, the connecting rod is provided with a convex column, when the convex column is positioned in the limiting groove, the valve clack closes the valve port, and when the convex column is positioned in the arc-shaped grooves with different arc lengths, the valve clack opens the valve port in different sizes; when the convex column is positioned in the arc-shaped groove with the longest arc length, the valve clack opens the valve port maximally, and when the convex column is positioned in the arc-shaped groove with the shortest arc length, the valve clack opens the valve port minimally.
In a further technical scheme, the buffer assembly comprises a buffer disc fixedly mounted on the inner circumferential side wall of the upper valve cavity, the buffer disc is provided with a buffer hole which penetrates through the buffer disc from top to bottom, and the valve rod penetrates through the buffer hole; a rotary table is fixedly arranged on the valve rod, a slotted hole is formed in the side face of the outer circumference of the rotary table along the radial direction of the rotary table, and a pressing rod and a spring used for forcing the pressing rod to press the inner side wall of the buffer hole are connected in the slotted hole in a sliding mode; a friction plate is arranged at one end of the compressing rod facing the inner side wall of the buffer hole; equidistant gaps and gradually-reduced gaps are formed between the inner side wall of the buffer hole and the outer circumferential side face of the rotary disc; when the friction disc is positioned in the equidistant gap, the valve clack fully opens the valve port, and when the friction disc is positioned at the minimum gap of the gradually-reduced gap, the valve clack fully closes the valve port; when the friction plate moves from the minimum clearance of the gradually-reduced clearance to the equidistant clearance, the frictional resistance between the friction plate and the inner side wall of the buffer hole is gradually reduced, and when the friction plate moves from the equidistant clearance to the minimum clearance of the gradually-reduced clearance, the frictional resistance between the friction plate and the inner side wall of the buffer hole is gradually increased.
In a further technical scheme, an annular cutting groove is formed in the inner side wall of the upper valve cavity at the opening at the upper end, and the buffer disc is installed in the annular cutting groove through a fixing pin.
In a further technical scheme, the rotary disc is fixedly arranged on the valve rod through a positioning pin.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The maximum rotating angle of the rotating shaft is controlled by selecting the arc-shaped grooves with different lengths, so that the opening degree of the valve port is controlled, the check valve has a flow control function, and the check valve is multifunctional;
(2) The valve port is opened in a rotating mode, so that the valve clack and the valve port can be prevented from being collided and damaged;
(3) The valve clack can be utilized to scrape impurities remained at the valve opening by opening the main valve opening in a rotating mode, so that the service life of the check valve is prolonged;
(4) When the valve port is closed, a buffer component is added, and the phenomenon of water hammer caused by too fast closing of the valve port is avoided.
Drawings
FIG. 1 is a cross-sectional view of a check valve of the present invention;
FIG. 2 is a cross-sectional view taken in the direction C-C when the port of the check valve of the present invention is closed;
FIG. 3 is a cross-sectional view in the direction C-C of the port of the check valve of the present invention when open;
FIG. 4 is a cross-sectional view of the check valve of the present invention taken in the direction D-D;
FIG. 5 is a block diagram of the check valve flow adjustment assembly of the present invention;
FIG. 6 is a view showing the construction of the check valve shaft and the lower end cap according to the present invention.
Detailed Description
Referring to fig. 1-6, a check valve includes a valve body 1, an upper valve chamber 1a and a lower valve chamber 1m are disposed in the valve body 1, and a valve port 1d for communicating the upper valve chamber 1a and the lower valve chamber 1m is disposed in the valve body 1; the side surface of the valve body 1 is provided with a port B communicated with the upper valve cavity 1a and a port A communicated with the lower valve cavity 1 m; the valve body 1 is fixedly provided with an upper end cover 2 at the upper end opening of the upper valve cavity 1a, and a lower end cover 7 at the lower end opening of the lower valve cavity 1 m.
A rotating shaft 5 is rotatably connected between the lower end cover 7 and the top of the lower valve cavity 1m in the lower valve cavity 1m, and the rotating shaft 5 and the lower valve cavity 1m are coaxially arranged; the lower end cover 7 is provided with a first baffle plate 7c and a second baffle plate 7b which extend upwards along the vertical direction on the surface facing the lower valve cavity 1m, and the upper ends of the first baffle plate 7c and the second baffle plate 7b are hermetically connected with the top of the lower valve cavity 1 m; the first baffle 7c and the second baffle 7b are in sealing connection with the inner circumferential side wall of the lower valve cavity 1m at the side far away from the rotating shaft 5 and in sliding sealing connection with the rotating shaft 5 at the side close to the rotating shaft 5; the first baffle 7c and the second baffle 7B divide the lower valve cavity 1m into a first sealed cavity and a second cavity 1c communicated with the port A, a power plate 6 extending into the first sealed cavity is arranged on the circumferential side surface of the rotating shaft 5, the power plate 6 divides the first sealed cavity into a third cavity 1e and a fourth cavity 1f, the third cavity 1e is communicated with the second cavity 1c, and the fourth cavity 1f is communicated with the port B; the circumferential side surface of the rotating shaft 5 close to the upper end of the rotating shaft is provided with a valve clack 4 for controlling the on-off of the valve port 1d, when the power plate 6 is close to the first baffle 7c, the valve clack 4 closes the valve port 1d, and when the power plate 6 is close to the second baffle 7b, the valve clack 4 completely opens the valve port 1d; wherein, be equipped with the first through-hole 5c that is used for communicateing third chamber 1e and second chamber 1c in the pivot 5, be equipped with the second through-hole that end to end just is used for communicateing fourth chamber 1f and B mouth in proper order in pivot 5, lower end cover 7, the valve body 1.
In addition, the upper end cover 2 is provided with a flow regulating component, and the flow regulating component is used for controlling the valve clack 4 to open the valve port 1d; and a buffer component is arranged in the upper valve cavity 1a and is used for controlling the valve clack 4 to slowly close the valve port 1 d.
The flow regulating assembly comprises a valve rod 3 and a connecting rod 8, the valve rod 3 is rotatably connected to the upper end cover 2, and the lower end of the valve rod 3 extends into the lower valve cavity 1m and is fixedly connected with the upper end of the rotating shaft 5; the upper end of the valve rod 3 extends out of the upper end cover 2, a through sliding hole 31 is formed in the side face, close to the upper end, of the valve rod 3 along the radial direction of the valve rod, the connecting rod 8 is connected in the sliding hole 31 in a sliding mode, six positioning holes 8a are uniformly formed in the connecting rod 8 along the length direction of the connecting rod at intervals, and the upper end of the valve rod 3 is detachably connected with positioning bolts 13 penetrating through the positioning holes 8a in a threaded mode; the upper end cover 2 is provided with a limiting groove 2b and six arc-shaped grooves 2a which are in one-to-one correspondence with the positioning holes 8a and have different arc lengths along the radial direction of the valve rod 3 by taking the valve rod 3 as the center, the left end of each arc-shaped groove 2a is communicated with the limiting groove 2b, the connecting rod 8 is provided with a convex column 9, when the convex column 9 is positioned in the limiting groove 2b, the valve flap 4 closes the valve port 1d, and when the convex column 9 is positioned in the arc-shaped grooves 2a with different arc lengths, the valve flap 4 opens the valve port 1d in different sizes; when the convex column 9 is positioned in the arc-shaped groove 2a with the longest arc length, the valve flap 4 opens the valve port 1d maximally, and when the convex column 9 is positioned in the arc-shaped groove 2a with the shortest arc length, the valve flap 4 opens the valve port 1d minimally.
The buffer assembly comprises a buffer disc 12, an annular cutting groove 101 is formed in the inner side wall of the upper valve cavity 1a at the opening of the upper end, and the buffer disc 12 is installed in the annular cutting groove 101 through a fixing pin 61; the buffer disc 12 is provided with a buffer hole 121 which penetrates up and down, and the valve rod 3 penetrates through the buffer hole 121; a rotary table 10 is fixedly mounted on the valve rod 3 through a positioning pin 15, a slotted hole 62 is formed in the outer circumferential side surface of the rotary table 10 along the radial direction of the rotary table 10, and a pressing rod 11 and a spring 14 for forcing the pressing rod 11 to press the inner side wall of the buffer hole 121 are connected in the slotted hole 62 in a sliding manner; a friction plate 11a is arranged at one end of the pressing rod 11 facing the inner side wall of the buffer hole 121; an equidistant gap 122 and a tapered gap 123 are formed between the inner side wall of the buffer hole 121 and the outer circumferential side surface of the turntable 10; when the friction disk is located in the equidistant gap 122, the valve flap 4 fully opens the valve port 1d, and when the friction disk is located at the minimum gap of the tapered gap 123, the valve flap 4 fully closes the valve port 1d; when the friction plate 11a moves from the minimum gap of the tapered gap 123 to the equidistant gap 122, the frictional resistance between the friction plate 11a and the inner side wall of the buffer hole 121 gradually decreases, and when the friction plate 11a moves from the equidistant gap 122 to the minimum gap of the tapered gap 123, the frictional resistance between the friction plate 11a and the inner side wall of the buffer hole 121 gradually increases.
As shown in fig. 1, the simple structure of the check valve of the present invention is that when the check valve realizes its check function, firstly the medium enters the port B from the port a of the stop valve and flows out, the medium enters the second chamber 1c through the port a, the medium enters the third chamber 1e through the first through hole 5c, the power plate 6 is pushed to move toward the second baffle 7B, and simultaneously the medium in the fourth chamber 1f passes through the rotating shaft 5, the lower end cover 7 and the second through hole in the valve body 1 to discharge out of the port B, when the power plate 6 moves toward the second baffle 7B, the valve flap 4 is driven by the rotating shaft 5 to gradually open the lower end of the valve port 1d, when the power plate 6 is tightly attached to the second baffle 7B, the valve flap 4 completely opens the lower end of the valve port 1d, the medium flows out of the port B from the port a, the port 1c, the valve port 1d and the upper valve chamber 1a, after the power plate 6 is opened, the pressure at the port a is greater than the pressure at the port B due to the pressure at the port at the third chamber 1e, so that the valve flap is always in an open state; when a medium enters from the port B of the stop valve, the medium sequentially passes through the valve body 1, the lower end cover 7 and the second through hole in the rotating shaft 5 to enter the fourth chamber 1f, meanwhile, the medium in the third chamber 1e enters the second chamber 1c through the first through hole 5c and is extruded out of the port A, the fluid medium pushes the power plate 6 to drive the rotating shaft 5 to rotate, and the valve clack 4 is driven to rotate to close the valve port 1d, so that the medium cannot flow to the port A from the port B, the non-return function is achieved, when the valve clack 4 is rotationally opened and closed, impurities remained on the valve port 1d can be scraped, the sealing surface is clean, and the service life of the check valve is prolonged.
When a medium flows from the port A to the port B, the valve clack 4 is opened, so that the medium can pass through the check valve, at the moment, the rotating shaft 5 can drive the valve rod 3 to rotate due to the fixed connection between the rotating shaft 5 and the valve rod 3, and the convex column 9 arranged on the connecting rod 8 is matched with the arc-shaped groove 2a and can slide in the arc-shaped groove 2a due to the fact that the connecting rod 8 is connected with the valve rod 3 through the positioning bolt 13, so that when the valve clack 4 is opened and the rotating shaft 5 rotates, the convex column 9 is driven by the connecting rod 8 to slide in the arc-shaped groove 2 a; because valve clack 4 pivoted angle is the same with connecting rod 8 turned angle, so control valve rod 3 turned angle just can control valve port 1d aperture, and then control check valve flow, when needs adjust the flow, need rotate valve rod 3, rotate projection 9 to the spacing groove 2b in, screw out positioning bolt 13, can promote connecting rod 8 to the center of valve rod 3 like this, drive projection 9 and draw close to the center, realize projection 9 and certain arc wall 2a to cooperate through choosing with positioning bolt 13 and the cooperation of certain locating hole 8a, because the arc length of each arc wall 2a is different, thereby it is different to have controlled the rotatable angle of connecting rod 8, thereby control check valve flow, projection 9 is when the arc wall 2a that the arc length is longer, the check valve flow is bigger.
In the process that the rotating shaft 5 drives the valve flap 4 to close the valve port 1d, because the rotating shaft 5 is fixedly connected with the valve stem 3, the rotating shaft 5 drives the valve stem 3 to rotate together, when the valve stem 3 rotates, the rotating disc 10 drives the pressing rod 11 and the friction plate 11a to rotate together, as shown in fig. 3, when the valve flap 4 is completely opened, the friction disc is located in the equidistant gap 122, the compression amount of the spring 14 is small, the pressure on the friction plate 11a is small, when the valve port 1d is closed by the rotation of the valve flap 4, the friction plate 11a rotates along with the rotation, and moves from the equidistant gap 122 to the minimum gap of the tapered gap 123, so that the compression amount of the spring 14 is gradually increased, as shown in fig. 2, when the valve port 1d is completely closed, the friction disc is located at the minimum gap of the tapered gap 123, in the process, the pressure of the spring 14 on the friction plate 11a is gradually increased, so that the friction resistance generated by the friction plate 11a in the valve port 1d in the closing process is gradually increased, so that the valve port 1d can be slowly closed, and the phenomenon of a water hammer caused by quick closing of the valve port is avoided.
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 (6)

1. The check valve is characterized by comprising a valve body, wherein an upper valve cavity and a lower valve cavity are arranged in the valve body, and a valve port for communicating the upper valve cavity with the lower valve cavity is arranged in the valve body; the side surface of the valve body is provided with a port B communicated with the upper valve cavity and a port A communicated with the lower valve cavity; the valve body is fixedly provided with an upper end cover at an upper end opening of the upper valve cavity and a lower end cover at a lower end opening of the lower valve cavity;
a rotating shaft is rotatably connected between the lower end cover and the top of the lower valve cavity in the lower valve cavity, and the rotating shaft and the lower valve cavity are coaxially arranged; the lower end cover is provided with a first baffle plate and a second baffle plate which extend upwards along the vertical direction on the surface facing the lower valve cavity, and the upper ends of the first baffle plate and the second baffle plate are hermetically connected with the top of the lower valve cavity; the side surface of the first baffle plate and the side surface of the second baffle plate, which is far away from the rotating shaft, are in sealing connection with the inner circumferential side wall of the lower valve cavity, and the side surface of the first baffle plate, which is close to the rotating shaft, is in sliding sealing connection with the rotating shaft; the first baffle and the second baffle divide the lower valve cavity into a first sealed cavity and a second cavity communicated with the port A, a power plate extending into the first sealed cavity is arranged on the circumferential side surface of the rotating shaft, the power plate divides the first sealed cavity into a third cavity and a fourth cavity, the third cavity is communicated with the second cavity, and the fourth cavity is communicated with the port B; the circumferential side surface of the rotating shaft close to the upper end of the rotating shaft is provided with a valve clack for controlling the on-off of the valve port, when the power plate is close to the first baffle plate, the valve clack closes the valve port, and when the power plate is close to the second baffle plate, the valve clack completely opens the valve port; the upper end cover is provided with a flow regulating component, and the flow regulating component is used for controlling the valve clack to open the valve port; and a buffer component is arranged in the upper valve cavity and used for controlling the valve clack to slowly close the valve port.
2. The check valve of claim 1, wherein a first through hole for communicating the third chamber with the second chamber is formed in the rotating shaft, and second through holes which are connected end to end and are used for communicating the fourth chamber with the port B are sequentially formed in the rotating shaft, the lower end cover and the valve body.
3. The check valve of claim 1, wherein the flow regulating assembly comprises a valve stem and a connecting rod, the valve stem is rotatably connected to the upper end cap, and the lower end of the valve stem extends into the lower valve cavity and is fixedly connected with the upper end of the rotating shaft; the upper end of the valve rod extends out of the upper end cover, a through sliding hole is formed in the side face, close to the upper end, of the valve rod along the radial direction of the valve rod, the connecting rod is connected in the sliding hole in a sliding mode, a plurality of positioning holes are uniformly formed in the connecting rod along the length direction of the connecting rod at intervals, and the upper end of the valve rod is detachably connected with positioning bolts penetrating through the positioning holes in a threaded mode; the upper end cover is provided with a limiting groove and a plurality of arc grooves with different arc lengths, wherein the arc grooves correspond to the positioning holes one by one, the left end of each arc groove is communicated with the limiting groove, the connecting rod is provided with a convex column, when the convex column is positioned in the limiting groove, the valve clack closes the valve port, and when the convex column is positioned in the arc grooves with different arc lengths, the valve clack opens the valve port with different sizes; when the convex column is positioned in the arc-shaped groove with the longest arc length, the valve clack opens the valve port maximally, and when the convex column is positioned in the arc-shaped groove with the shortest arc length, the valve clack opens the valve port minimally.
4. The check valve of claim 3, wherein the buffer assembly comprises a buffer disk fixedly mounted on the inner circumferential side wall of the upper valve chamber, the buffer disk is provided with a buffer hole penetrating up and down, and the valve rod passes through the buffer hole; a rotary table is fixedly installed on the valve rod, a slotted hole is formed in the outer circumferential side face of the rotary table along the radial direction of the rotary table, and a pressing rod and a spring used for forcing the pressing rod to press the inner side wall of the buffer hole are connected in the slotted hole in a sliding mode; a friction plate is arranged at one end of the compressing rod facing the inner side wall of the buffer hole; equidistant gaps and gradually-reduced gaps are formed between the inner side wall of the buffer hole and the outer circumferential side face of the rotary disc; when the friction disc is positioned in the equidistant clearance, the valve clack fully opens the valve port, and when the friction disc is positioned at the minimum clearance of the gradually-reduced clearance, the valve clack fully closes the valve port; when the friction plate moves from the minimum clearance of the gradually-reduced clearance to the equidistant clearance, the frictional resistance between the friction plate and the inner side wall of the buffer hole is gradually reduced, and when the friction plate moves from the equidistant clearance to the minimum clearance of the gradually-reduced clearance, the frictional resistance between the friction plate and the inner side wall of the buffer hole is gradually increased.
5. The check valve of claim 4, wherein the upper chamber is provided with an annular groove on an inner sidewall of the upper chamber at the upper end opening, and the cushion disc is mounted in the annular groove by a fixing pin.
6. The check valve of claim 4, wherein the dial is fixedly mounted to the valve stem by a locating pin.
CN202010079486.8A 2020-02-04 2020-02-04 Check valve Active CN111173968B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010079486.8A CN111173968B (en) 2020-02-04 2020-02-04 Check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010079486.8A CN111173968B (en) 2020-02-04 2020-02-04 Check valve

Publications (2)

Publication Number Publication Date
CN111173968A CN111173968A (en) 2020-05-19
CN111173968B true CN111173968B (en) 2023-04-18

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CN112197017A (en) * 2020-09-17 2021-01-08 上海祁尔塑胶有限公司 Ceramic valve core capable of effectively controlling water flow
CN116181984A (en) * 2022-09-08 2023-05-30 江苏爱索新材料科技有限公司 Pipe joint and automatic drain valve
CN115419731B (en) * 2022-09-20 2024-07-09 奥工阀门有限公司 Multifunctional anti-leakage forged steel ball valve

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