CN109237084B - Double-flap check butterfly valve - Google Patents

Abstract

The invention discloses a double-flap check butterfly valve. The pipe orifices at the two ends of the valve body pipeline are respectively fluid inlets and outlets, the middle pipe section of the valve body pipeline is provided with a kidney-shaped valve port, the two sides of the kidney-shaped valve port are respectively provided with a left check valve clack assembly and a right check valve clack assembly which have the same structure, and the left check valve clack assembly and the right check valve clack assembly are matched together to form a valve core opening and closing butterfly valve; vertical transverse plates are arranged above and below the middle part of the waist-shaped valve port, arc-shaped inner flanges are arranged at the arc-shaped parts at the two ends of the waist-shaped valve port of the valve body pipeline, insertion holes are formed at the joint between the arc-shaped inner flanges and the transverse plates below, and through holes are formed at the joint between the arc-shaped inner flanges and the transverse plates; the check valve clack assembly comprises a valve clack, a hand wheel, a chuck, a rotating shaft, a valve clack rotating shaft, a sealing bolt and a sector limiting block. The invention can seal and regulate the flow of fluid in the pipeline, and most importantly, the invention also has a non-return function. The double-flap check butterfly valve is smaller in size, lighter in weight, capable of being started, closed and checked quickly, and particularly suitable for a flow pipeline with high pressure.

Description

Double disc check butterfly valve

Technical field

The present invention relates to a butterfly valve in the field of flow control, in particular to a double-leaf check butterfly valve.

Background technique

Butterfly valve, also called flap valve, is a regulating valve with a simple structure. It mainly plays the role of cutting off and regulating on pipelines. Check valve is also called one-way valve, check valve, back pressure valve, etc. This type of valve automatically opens and closes by the force generated by the flow of the medium itself in the pipeline. It is an automatic valve whose function is to prevent The medium in the pipeline flows back to prevent accidents.

At present, for traditional pipelines, ordinary butterfly valves can only simply control the opening and closing of the waterway, while the backflow of the medium in the pipeline cannot be controlled. Once the backflow of the medium occurs, it will have a great impact. When the traditional check valve is working, the valve disc is easily affected by gravity, and the fluid resistance will also affect the response speed of the valve disc, and the traditional check valve cannot adjust the flow rate. Therefore, it is necessary to propose a new double-disc check butterfly valve to address the shortcomings in practical applications.

Contents of the invention

In order to solve the problems existing in the background technology, the present invention provides a double-leaf check butterfly valve. The butterfly valve is specially designed to have the functions of check and flow regulation.

The technical solutions adopted by the present invention to solve the technical problems are:

The pipe ports at both ends of the valve body pipeline of the present invention are respectively the fluid inlet and the fluid outlet. The middle pipe section of the valve body pipeline is provided with a waist-shaped valve port. Left and right check valve disc assemblies with the same structure are respectively installed on both sides of the waist-shaped valve port. , the left and right check valve disc components work together to form a valve core opening and closing butterfly valve; vertical horizontal plates are provided above and below the middle part of the waist-shaped valve port of the valve body pipeline, and both ends of the waist-shaped valve port of the valve body pipeline The arc-shaped portion is provided with an arc-shaped inner flange on the side close to the fluid outlet. There is a socket at the connection between the arc-shaped inner flange and the lower horizontal plate. There is a hole between the arc-shaped inner flange and the upper horizontal plate. There is a through hole at the joint; take the right check valve disc assembly as an example for illustration. The right check valve disc assembly includes the right valve disc, handwheel, chuck, rotating shaft, valve disc rotating shaft, sealing bolt, and sector-shaped limit block; The right valve disc includes three parts: a sleeve in the middle and two sub-valve discs symmetrically fixed on both sides of the sleeve. Among the two sub-valve discs on both sides, the part close to the center of the valve body pipe is a rectangular valve disc, and the part away from the valve disc is rectangular. One side of the center of the valve body pipe is a round-shaped valve disc. The outer surface of the round-shaped valve disc is equipped with an arc-shaped outer flange on the side close to the fluid inlet. The outer size of the arc-shaped outer flange is larger than the arc-shaped inner flange. The inner dimensions of the flange; there are coaxial special-shaped installation slots on the upper and lower ends of the sleeve. The central axis of the special-shaped installation slot serves as the rotation axis. The chuck is fixed on the top of the valve body pipe. The upper end of the rotation shaft passes through the valve body pipe and the chuck. The lower end of the rotating shaft is rotatably inserted into the special-shaped installation slot on the upper end of the sleeve through the sector-shaped limit block. The upper end of the rotating shaft and the chuck are movable and rotatably connected. The upper end of the rotating shaft and the handwheel are connected at the same time. Shaft connection; the upper end of the valve disc rotating shaft is fixed in the special-shaped installation slot at the lower end of the sleeve. The lower end of the valve disc rotating shaft extends into the socket and contacts the top of the sealing bolt in the socket; the upper end of the chuck is provided with a central boss. The outer peripheral surface of the center boss is provided with external splines, and the lower end of the handwheel is provided with a stepped hole. The lower hole of the stepped hole is a large hole. The inner wall of the lower hole of the stepped hole is provided with internal splines. The outer peripheral surface of the upper end boss of the chuck is embedded in the stepped hole. A spline fitting connection is formed in the lower hole, and the handwheel can move up and down along the direction of the rotation axis and then be connected to or detached from the chuck through splines.

The special-shaped installation slot on the upper end of the sleeve is a combination of two semicircular holes, one large and one small. The larger semicircular hole is arranged on the side of the sleeve close to the fluid outlet, and the larger semicircular hole and the smaller semicircular hole are arranged on the side of the sleeve close to the fluid outlet. Two step blocking surfaces are formed between the holes; the main body of the sector-shaped limiting block is an annular structure, the inner ring of the annular structure and the rotating shaft are coaxially connected, and one side of the annular structure is fixed with a 1/4 circle center The arc-shaped bumps at the corners are embedded in the larger semicircular holes in the special-shaped installation slots. The two ends of the protruding part of the arc-shaped bumps are the left end face and the right end face respectively; the handwheel rotates through the rotating shaft to drive the fan shape The limit block rotates in the special-shaped installation slot at the upper end of the sleeve, driving the arc-shaped bump to move in the larger semicircular hole in the special-shaped installation slot, so that the left end face and the right end face fit between the two step blocking surfaces respectively. touch.

The circular structure of the sector-shaped limit block has a keyway on its inner circumferential surface, and the lower end of the rotating shaft is provided with a convex key and a keyway for cooperative connection, so that the inner ring of the circular structure and the rotating shaft are coaxially connected.

The upper end of the rotating shaft is a square column structure, and the upper hole of the stepped hole at the lower end of the handwheel is a square hole. The square column structure at the upper end of the rotating shaft is inserted into the square hole at the lower end of the handwheel to form a coaxial rotation connection. The axis between the rotating shaft and the handwheel is They can move axially, but move synchronously in the circumferential direction.

The top surface of the chuck around the central boss is provided with an angle line as a scale display, and the outer peripheral surface of the lower end of the handwheel is provided with an indicator line arranged along the axial direction.

The right check valve disc assembly also includes an upper sector magnet and a lower sector magnet. The upper sector magnet is fixed on the lower end surface of the valve disc rotating shaft. The lower sector magnet is fixed on the top surface of the sealing bolt. The upper sector magnet and the lower sector magnet are in the same polarity. Reject the arrangement.

The area of the rectangular valve disc is larger than the area of the round-shaped valve disc.

There is a fan-shaped groove on the lower end of the valve disc rotating shaft, and the material of the lower part of the valve disc rotating shaft is a magnetic isolation material; there is a fan-shaped groove on the top surface of the sealing bolt, and a sector-shaped magnet is installed in the groove, and the upper part of the sealing bolt is an isolation magnet. Magnetic isolation material.

Through the above structure, the present invention has a valve body pipeline that allows fluid to pass through, left and right valve discs that can adjust the opening and checkback, and a sector-shaped limiting block that can limit the left and right valve discs. The rotating shaft that controls the rotation of the left and right valve discs, the handwheel that can rotate and lock the left and right valve discs, and adjust the opening, the chuck marked with the valve opening, and the two pairs of sector magnets that can generate repulsive force , sealing bolts and valve disc shafts that can isolate magnetic fields.

The beneficial effects of the present invention are:

The invention can seal and regulate the flow of fluid in the pipeline, and most importantly, it also has a non-return function. The double-disc check butterfly valve is smaller in size, lighter in weight, and can start, close and check quickly. It is especially suitable for circulation pipelines with high pressure, and has the function of checking and regulating flow.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the double-leaf check butterfly valve of the present invention.

Figure 2 is a schematic structural diagram of the left and right check valve disc assemblies of the present invention after removing the valve body pipeline.

Figure 3 is a schematic structural diagram of the right valve disc of the double-disc check butterfly valve of the present invention with a 45-degree opening (no valve body pipeline).

Figure 4 is a perspective view of the handwheel structure of the present invention.

Figure 5 is a bottom view of the handwheel structure of the present invention.

Figure 6 is a perspective view of the chuck structure of the present invention.

Figure 7 is a perspective view of the sector-shaped limiting block of the present invention.

Figure 8 is a perspective view of the right valve disc of the present invention.

Figure 9 is a top view of the right valve disc of the present invention.

Figure 10 is a perspective view of the valve body pipeline of the present invention and its partial enlarged view.

Figure 11 is a schematic diagram of the layout of the magnetic structure of the present invention (when the opening is 90 degrees).

Figure 12 is a schematic structural diagram of the sector magnet of the present invention.

Figure 13 is a schematic structural diagram of the right valve disc of the present invention with a 90-degree opening (no valve body pipeline, the view direction is opposite to that of Figures 2 and 3).

In the picture: valve body pipe 1, right valve disc 2, left valve disc 3, hand wheel 4, chuck 5, rotating shaft 6, valve disc rotating shaft 7, sealing bolt 8, sector limit block 9, upper sector magnet 10, lower Sector magnet 11, socket 101, arc-shaped inner flange 102, horizontal plate 103, special-shaped installation slot 201, rectangular valve disc 202, round-shaped valve disc 203, arc-shaped outer flange 204, indicator line 401, inner flower Key 402, external spline 501, angle line 502, left end face 901, right end face 902, keyway 903.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, taking the right valve disc opening as an example:

As shown in Figure 1, the two ends of the valve body pipeline 1 are respectively the fluid inlet and the fluid outlet. A waist-shaped valve port is opened in the middle section of the valve body pipeline 1. The waist-shaped valve port is arranged horizontally, and the arc-shaped valve ports at both ends of the waist-shaped valve port are arranged The left and right check valve disc assemblies with the same structure are installed on both sides of the waist-shaped valve port. The left and right check valve disc assemblies work together to form a valve core opening and closing butterfly valve; the left check valve is The valve disc assembly is mainly composed of the left valve disc 3. The left check valve disc assembly and the right check valve disc assembly are symmetrically arranged on both sides of the valve body pipe 1.

As shown in Figure 10, vertical horizontal plates 103 are provided above and below the middle part of the waist-shaped valve port of the valve body pipeline 1. The upper horizontal plates and the lower horizontal plates are mainly for valves other than the left valve disc and the right valve disc. The body channel is filled to form a valve port. The arcuate parts at both ends of the waist-shaped valve port of the valve body pipeline 1 are provided with arcuate inner flanges 102 on the side close to the fluid outlet. The connection between the arcuate inner flange 102 and the lower horizontal plate 103 is provided with The insertion hole 101, the arc-shaped inner flange 102 and the upper horizontal plate 103 are connected with a through hole for the rotating shaft 6 to pass through. The insertion hole 101 and the through hole are on the same vertical axis.

As shown in Figures 2 and 3, the right check valve disc assembly is taken as an example. The right check valve disc assembly includes a right valve disc 2, a hand wheel 4, a chuck 5, a rotating shaft 6, a valve disc rotating shaft 7, a seal Bolt 8, sector limit block 9, upper sector magnet 10 and lower sector magnet 11; as shown in Figures 8 and 9, the right valve disc 2 includes a sleeve in the middle and two sub-sections symmetrically fixed on both sides of the sleeve. There are three parts of the valve disc. Among the two sub-valve discs on both sides, the side part close to the center of the valve body pipe 1 is a rectangular valve disc 202, and the side part far away from the center of the valve body pipe 1 is a round notched valve disc 203. The right valve The rectangular valve discs 202 in the left valve disc 2 and the left valve disc 3 are formed to fit in the middle part of the waist-shaped valve port, and the circular gap-shaped valve discs 203 in the right valve disc 2 and the left valve disc 3 are respectively matched to the arcs at both ends of the waist-shaped valve port. As shown in Figure 9, the outer surface of the round-shaped valve disc 203 is provided with an arc-shaped outer flange 204 on the side close to the fluid inlet. The arc-shaped outer flange 204 and the arc-shaped inner flange 102 block and cooperate. The outer size of the outer flange 204 is larger than the inner size of the arc-shaped inner flange 102, so that when the right valve disc 2 rotates, the arc-shaped outer flange 204 is blocked by the arc-shaped inner flange 102, thereby limiting the rotation of the right valve disc 2. Angle; the sleeve is arranged vertically, with coaxial mounting holes on the upper and lower ends of the sleeve. The central axis of the mounting hole serves as the rotation axis. The chuck 5 is fixed on the top of the valve body pipe 1, and the upper end of the rotating shaft 6 passes through the waist of the valve body pipe 1. The through hole of the shaped valve port is connected to the hand wheel 4 after the chuck 5. The lower end of the rotating shaft 6 is rotatably inserted into the mounting hole at the upper end of the sleeve through the sector-shaped limit block 9. There is movement between the upper end of the rotating shaft 6 and the chuck 5. The upper end of the rotating shaft 6 and the handwheel 4 are connected coaxially; the upper end of the valve disc rotating shaft 7 is fixedly sleeved in the mounting hole at the lower end of the sleeve, and the lower end of the valve disc rotating shaft 7 extends into the socket 101 and is inserted into the socket 101. The top of the sealing bolt 8 in the hole 101 contacts.

The invention includes a valve body pipeline with a channel, a left valve disc and a right valve disc installed in the valve body pipeline, a check device embedded inside the left valve disc and the right valve disc rotating shaft, and can control the left valve disc and the right valve disc. A control device for disc rotation, a locking structure that restricts the rotation angles of the left and right valve discs, and a magnetic device that assists the check device.

As shown in Figure 5 and Figure 6, the upper end of the chuck 5 is provided with a central boss, and the outer peripheral surface of the central boss is provided with an external spline 501. The lower end of the handwheel 4 is provided with a stepped hole. The lower hole of the stepped hole is a large hole, and the lower hole of the stepped hole is a large hole. Internal splines 401 are provided on the inner wall of the lower hole. The outer peripheral surface of the upper end boss of the chuck 5 is embedded in the lower hole of the stepped hole to form a spline fit connection. The handwheel 4 can move up and down along the direction of the rotation axis and is connected to the chuck through splines. The disc 5 may be separated from the chuck 5 . At the same time, the upper end of the rotating shaft 6 has a square column structure, and the upper hole of the stepped hole at the lower end of the handwheel 4 is a square hole. The square column structure at the upper end of the rotating shaft 6 is inserted into the square hole at the lower end of the handwheel 4 to form a coaxial rotation connection. The rotating shaft 6 and the handwheel The wheels 4 can move axially, but move synchronously in the circumferential direction.

The handwheel is connected to the rotating shaft and can rotate the rotating shaft. The internal contour below the handwheel is an internal spline. There is an indicator line on the outside of the handwheel. The handwheel can move up and down along the axial direction of the rotating shaft;

The chuck is fixedly installed on the boss outside the valve body channel. It is in the shape of a double-layered circular cone. The upper circular cone is an external spline and is combined with the internal ring gear of the handwheel to lock the rotating shaft so that the sector-shaped limit block The rotation angle of the left and right valve discs is limited. The angle line is engraved on the upper surface of the lower round table, which is combined with the indicator line on the outside of the handwheel to complete the quantitative adjustment of the butterfly valve.

When it is necessary to rotate the rotating shaft, first lift the handwheel upward and move it upward along the axial direction of the rotating shaft to disengage the internal splines of the handwheel from the external splines of the upper circular cone of the chuck, and then turn the handwheel to drive the rotating shaft to rotate. The indicator line on the outside of the handwheel and the angle line on the lower circular table of the chuck determine the angle of rotation of the rotating shaft, thereby further achieving the purpose of rotating the left or right valve disc. After rotating to the preset angle, press the handwheel downward to engage the internal splines of the handwheel with the external splines of the chuck's upper circular cone. Since the chuck is fixed on the boss outside the valve body channel, when entering After engagement, the handwheel is locked, thereby locking the sector-shaped limit block through the rotating shaft.

The sector-shaped limiting block 9 and the rotating shaft 6 mainly constitute a non-return device.

The sector-shaped limit block 9 is placed in the slot above the left and right valve discs, which can limit the rotation angle of the left and right valve discs. There is a keyway on the back of the sector-shaped limit block, which can cooperate with the key to complete the The connection of the rotating shaft makes the sector-shaped limit block controlled by the rotating shaft;

As shown in Figure 7, the main body of the sector-shaped limit block 9 is an annular structure. The inner ring of the annular structure is coaxially connected to the rotating shaft 6. An arc-shaped protrusion occupying 1/4 of the central angle of the annular structure is fixed on one side of the annular structure. block, the arc-shaped bump is embedded in the larger semicircular hole in the installation hole, and the two ends of the protruding part of the arc-shaped bump are the left end face 901 and the right end face 902 respectively.

The rotating shaft 6 is placed in the rotating shaft through hole of the valve body pipeline and is connected to the control device to complete the control of the sector-shaped limit block, thus constraining the rotation angles of the left and right valve discs.

As shown in Figure 7, the inner circumferential surface of the annular structure of the sector-shaped limit block 9 is provided with a keyway 903, and the lower end of the rotating shaft 6 is provided with a convex key and the keyway 903 for cooperative connection, so that the inner ring of the annular structure and the rotating shaft 6 are coaxial. The connection transmits torque.

The mounting hole on the upper end of the sleeve is a combination of two semicircular holes, one large and one small. The larger semicircular hole is arranged on the side of the sleeve close to the fluid outlet. Two semicircular holes are formed between the larger semicircular hole and the smaller semicircular hole. A step blocking surface. The handwheel 4 rotates through the rotating shaft 6 to drive the sector-shaped limit block 9 to rotate in the mounting hole at the upper end of the sleeve, driving the arc-shaped bump to move in the larger semicircular hole in the mounting hole, so that the left end face 901 and the right end face 902 are respectively in the The two step blocking surfaces are in mating contact.

When it is necessary to adjust the opening of the left valve disc or the right valve disc, the rotating shaft rotates, and the sector-shaped limit block is first rotated through a certain angle in the sector-shaped slot above the left valve disc or the right valve disc through the key to reach the opening. The position is set in advance. When the fluid flows through the valve body pipe, the left or right valve disc rotates to the set angle by the impact and pressure of the water, and is limited by the sector-shaped limit block, so that the left or right valve disc rotates to the set angle. The valve disc reaches a certain opening.

Since the sector-shaped slot angle of the left or right valve disc is 180 degrees, the sector-shaped limit block angle is 90 degrees, and the rotation angle of the left or right valve disc is also between 0 and 90 degrees, therefore, when the inside of the pipeline When fluid backflow occurs, the sector-shaped limit block will not limit the position of the left or right valve disc. The left or right valve disc will rotate, which is controlled by the arc-shaped inner flange around the circumference of the valve body pipe. limit and finally close.

As shown in Figure 6, the top surface of the chuck 5 around the central boss is provided with an angle line 502 as a scale display. As shown in Figure 4, the outer peripheral surface of the lower end of the handwheel 4 is provided with an indicator line 401 arranged along the axial direction. The angle line 502 and the indicator line 401 cooperate to complete the quantitative adjustment of the butterfly valve.

The arc-shaped inner flange around the circumference of the valve body pipe and the arc-shaped outer flange around the left and right valve discs mainly form a locking structure. Among them, the arc-shaped inner flange around the circumference of the valve body pipe cooperates with the arc-shaped outer flange around the left and right valve discs to constrain the rotation of the left or right valve disc, so that the left and right valve discs The minimum rotation angle of the valve disc is 0 degrees and is perpendicular to the valve body pipe.

The details of the left valve disc and the right valve disc are:

The left valve disc is installed on the left side of the valve body pipe. It rotates together with the valve disc shaft on the left side and can rotate clockwise at a maximum angle of 90 degrees. It is aligned by the sector-shaped limit block and the rotating shaft in the sector-shaped slot above the left valve disc. The rotation angle is constrained to rotate between 0 and 90 degrees, where the sector-shaped slot angle is 180 degrees and the sector-shaped limit block angle is 90 degrees;

The right valve disc is installed on the right side of the valve body pipeline. It rotates together with the valve body shaft on the right side and can rotate counterclockwise at a maximum angle of 90 degrees. It is aligned by the sector-shaped limit block and the rotating shaft in the sector-shaped slot above the right valve disc. The rotation angle is constrained to rotate between 0 and 90 degrees, where the sector-shaped slot angle is 180 degrees and the sector-shaped limit block angle is 90 degrees;

The left valve disc and the right valve disc have two parts: a rectangular area and a sector-shaped area, in which the area of the rectangular valve disc 202 is larger than the area of the round-shaped valve disc 203. Both the left valve disc 3 and the right valve disc 2 can rotate around the valve disc rotation axis, and the maximum rotation angle is 90 degrees.

When fluid passes through, under the same pressure, whether it is the left valve disc or the right valve disc, since the area of the rectangular valve disc is larger than the area of the round-shaped valve disc, the pressure on the rectangular valve disc is greater than the pressure on the sector-shaped part. The pressure on both sides of the rotation axis of the left and right valve discs is uneven, causing the left and right valve discs to rotate around the rotation axis.

As shown in Figures 11 and 12, the right check valve disc assembly also includes a magnetic device mainly composed of an upper sector magnet 10 and a lower sector magnet 11. The upper sector magnet 10 is fixed on the lower end surface of the valve disc rotating shaft 7, and the lower sector magnet 11 Fixed on the top surface of the sealing bolt 8, the upper sector magnet 10 and the lower sector magnet 11 are arranged with the same polarity and repel each other, that is, the upper sector magnet 10 and the lower sector magnet 11 are arranged in the same polarity direction along the arc direction.

The valve disc rotating shaft combines the left and right valve discs with the valve body pipeline and can rotate with the rotation of the left and right valve discs. There is a fan-shaped groove under the valve disc rotating shaft. The valve disc rotating shaft is made of ferromagnetic material. You can choose ordinary carbon steel or silicon steel sheets or silicon steel sheets and other materials that can isolate the magnet's magnetism;

The sealing bolt cooperates with the valve body pipeline through threaded connection, and plays a certain sealing role for the fluid inside the valve body pipeline. There is a fan-shaped groove above the sealing bolt, and the material above the sealing bolt is used to isolate the magnetic properties of the magnet;

The sector magnets are closely matched with the above-mentioned sealing bolts and valve disc rotating shaft respectively. The sector magnets on the valve disc rotating shaft can rotate with the rotation of the valve disc rotating shaft, while the magnets on the sealing bolts remain stationary. When the left or right valve disc rotates, the valve disc shaft will also rotate, and the sector magnet will rotate accordingly. When the left or right valve disc rotates to the maximum angle of 90 degrees, the magnetic poles of the two sector magnets with the same name will be close together. A repulsive force is generated, which can push the valve disc shaft to rotate in the opposite direction to the original rotation direction, thereby causing the left or right valve disc to rotate in the opposite direction.

There is a sector-shaped groove on the lower end of the valve disc rotating shaft, and a sector magnet is installed in the groove. The outline shape of the groove should be the same as the shape of the sector magnet. The material of the lower part of the valve disc rotating shaft is a magnetic isolation material; the top surface of the sealing bolt has a A sector-shaped groove, a sector-shaped magnet is installed in the groove, and the upper part of the sealing bolt is a magnetic isolation material that isolates the magnet's magnetism.

The shapes of the two pairs of sector magnets are exactly the same, and a certain magnetic pole of the same name of each pair of sector magnets should be on the same plane, so that mutual repulsive force can be generated when the sector magnets rotate together.

As shown in Figure 13, the working process of the present invention is as follows:

When the right valve disc opening of the double-disc check butterfly valve is 0, the indicator line 401 of the handwheel 4 coincides with the 0 scale line on the angle line 502 of the chuck 5 . At the same time, the internal splines 402 of the handwheel 4 are in mesh with the external splines 501 of the chuck 5. Since the chuck 5 is fixed on the valve body pipe 1, the handwheel 4 will be locked, and the rotating shaft 6 will also be locked. Tight and unable to turn.

The sector-shaped limiting block 9 is connected to the rotating shaft 6 through the key at the keyway 903 and will also be locked, forcing the left end surface 901 of the sector-shaped limiting block 9 to be in contact with the left end surface of the sector-shaped slot 201 of the right valve disc 2 position, a force is exerted on the left end surface of the sector-shaped slot 201 toward the inlet direction of the valve body pipe 1, causing the right valve disc 2 and the valve disc rotating shaft 7 to tend to rotate around the socket 101 of the valve body pipe 1. However, since the radius of the arc-shaped inner flange 102 on the inner wall of the valve body pipe 1 is smaller than the radius of the arc-shaped outer flange 204 of the right valve disc 2, the movement trend of the right valve disc 2 will be restricted. The round-shaped valve disc 203 cannot move toward the outlet direction of the flow channel, and the rectangular valve disc 202 of the right valve disc 2 cannot move toward the inlet direction of the flow channel, so that the right valve disc is locked and the opening of the right valve disc is kept at 0.

When the double-disc check butterfly valve needs to be opened to a certain degree, taking the right valve disc to open 45 degrees as an example, you need to lift the handwheel 4 upward first, so that the inner spline 402 of the handwheel 4 is in contact with the outer surface of the chuck 5. The spline 501 is out of mesh. At this time, the handwheel 4 and the rotating shaft 6 maintain coaxial rotation through the cooperation of the square shaft and the square hole. Then rotate the handwheel 4 so that the indicator line 401 coincides with the 45-degree scale line on the angle line 502 of the chuck 5, and then press the handwheel 4 so that the inner spline 402 of the handwheel 4 is in line with the outer spline of the chuck 5. The spline 501 re-enters the meshing state and locks the sector limit block 9. The rotation of the handwheel 4 will drive the rotating shaft 6 to rotate, so that the sector-shaped limit block 9 will also rotate 45 degrees through the key connection. The left end surface 901 of the sector-shaped limit block 9 and the left end surface of the sector-shaped slot 201 of the right valve disc 2 After disengagement, the sector-shaped limiting block 9 is locked and fixed. At this time, since the right valve disc 2 is separated from the restriction of the sector-shaped limiting block 9, the circular gap-shaped valve disc 203 of the right valve disc 2 can move toward the flow channel inlet or the flow channel outlet direction, and at the same time, the rectangular valve disc of the right valve disc 2 202 can move toward the outlet of the flow channel or the inlet of the flow channel and enter a state where it can rotate.

When the fluid passes through the valve body pipeline, under the pressure of the fluid, since the area of the rectangular valve disc 202 of the right valve disc 2 is larger than the area of the round notch-shaped valve disc 203, the pressure on the rectangular valve disc 202 is greater than that of the round notch-shaped valve. Due to the pressure on the disc 203, the forces on both sides of the rotation axis of the right valve disc 2 are uneven, so that the right valve disc 2 will rotate around the rotation axis. Since the sector-shaped limiting block 9 is fixed at the 45-degree position, when the left end surface of the sector-shaped slot 201 of the right valve disc 2 contacts the left end surface 901 of the sector-shaped limiting block 9, the right valve disc 2 will be subjected to the sector-shaped movement again. The rotation is stopped by the restriction of the limit block 9. The right valve disc 2 is locked again under the constraints of the fluid pressure and the sector-shaped limiting block 9. The right valve disc 2 opens 45 degrees.

When the fluid in the pipeline reverses flow, the stress at pipe 1 of the valve body will change. Since the area of the rectangular valve disc 202 of the right valve disc 2 is larger than the area of the round notch-shaped valve disc 203, the pressure on the rectangular valve disc 202 is greater than the pressure on the round notch-shaped valve disc 203. It flows through the valve body pipe 1 The counter-flow fluid will exert pressure in the opposite direction to the right valve disc 2. The left end surface of the sector-shaped slot 201 of the right valve disc 2 loses the restraint of the left end surface 901 of the sector-shaped limiter 9, and the right valve disc 2 enters a rotatable state. Under the pressure of the fluid, the right valve disc 2 rotates in the opposite direction and gradually closes. The round and missing disc 203 of the right valve disc 2 can move toward the outlet of the flow channel, and the rectangular valve disc 202 of the right valve disc 2 can move toward the outlet of the flow channel. . During the closing process, the flow area at the valve body pipe 1 becomes smaller and smaller, the pressure becomes larger and larger, and the closing speed of the right valve disc 2 becomes faster and faster until it is completely closed. After closing, the right valve disc 2 is locked under the constraints of the reverse flow pressure and the arc-shaped inner flange 102 on the inner wall of the valve body pipe 1, and the check effect of the double-disc check butterfly valve appears.

When the operator discovers the backflow situation, he lifts the handwheel 4 upward to disengage the internal spline 402 of the handwheel 4 from the external spline 501 of the chuck 5, and then rotates the handwheel 4 so that the indicator line 401 is in contact with the chuck. The 0-degree scale line on the angle line 502 of the disk 5 coincides, and then the handwheel 4 is pressed down, so that the internal splines 402 of the handwheel 4 and the external splines 501 of the chuck 5 re-enter the meshing state. At this time, the left end surface 901 of the sector-shaped limiting block 9 is in contact with the left end surface of the sector-shaped slot 201 of the right valve disc 2, the right valve disc 2 enters the mechanical locking state, and the double-disc check butterfly valve is closed.

When the opening is 90 degrees, the rectangular valve disc 202 and the rounded valve disc 203 of the right valve disc 2 are parallel to the flow direction of the fluid, and cannot be checked solely by the pressure of the fluid. An upper sector magnet 10 and a lower sector magnet 11 are respectively installed below the valve disc rotating shaft 7 and above the sealing bolt 8, and the two magnets face each other with the same pole, and will generate a repulsive force when approaching. The areas where the sector magnets are installed on the valve disc shaft 7 and the sealing bolts 8 are made of ferromagnetic material, which can isolate the magnetism of the magnets. When the opening of the double-leaf check butterfly valve is very small, the upper sector magnet 10 and the lower sector magnet 11 will not contact. When the opening of the double-leaf check butterfly valve is close to 90, the upper sector magnet 10 and the lower sector magnet 11 will slow down. The slow contact generates mutual repulsive force, and drives the right valve disc 2 through the valve disc rotating shaft 7, so that the right valve disc 2 has a tendency to rotate. Under normal circulation conditions with an opening of 90 degrees, the repulsive force generated by the upper sector magnet 10 and the lower sector magnet 11 is much smaller than the pressure when the fluid flows normally in the valve body pipe 1. At the same time, due to the constraints of the sector limiter 9 The effect of the repulsive force of the upper sector magnet 10 and the lower sector magnet 11 on the opening of the right valve disc 2 during normal fluid circulation is very weak and can be ignored.

However, once the fluid in the pipeline reverses flow, the repulsive force of the upper sector magnet 10 and the lower sector magnet 11 will have a certain impact on the opening of the right valve disc 2, and the repulsive force will deflect the right valve disc 2 to a certain angle. The area of the rectangular valve disc 202 of the valve disc 2 is larger than the area of the round notch-shaped valve disc 203, so that the pressure on the rectangular valve disc 202 is greater than the pressure on the round notch-shaped valve disc 203. Under the pressure of the counter-flow fluid and a pair of sector magnets Under the combined action of the repulsive force of the two, the deflection angle of the right valve disc 2 becomes larger and larger, the right valve disc 2 rotates in the opposite direction, gradually closes, and gradually enters the normal check state, achieving the check function when the opening is 90 degrees. .

Claims (6)

1. The utility model provides a bivalve check butterfly valve which characterized in that: the pipe orifices at two ends of the valve body pipeline (1) are respectively a fluid inlet and a fluid outlet, a waist-shaped valve port is formed in the middle pipe section of the valve body pipeline (1), left and right check valve clack components with the same structure are respectively arranged at two sides of the waist-shaped valve port, and the left and right check valve clack components are matched together to form a valve core opening and closing butterfly valve; vertical transverse plates (103) are arranged above and below the middle part of the kidney-shaped valve port of the valve body pipeline (1), arc-shaped inner flanges (102) are arranged at two ends of the kidney-shaped valve port of the valve body pipeline (1) on one side close to a fluid outlet, insertion holes (101) are formed at the joint between the arc-shaped inner flanges (102) and the transverse plates (103) below, and through holes are formed at the joint between the arc-shaped inner flanges (102) and the transverse plates (103) above; the right check valve clack assembly comprises a right valve clack (2), a hand wheel (4), a chuck (5), a rotating shaft (6), a valve clack rotating shaft (7), a sealing bolt (8) and a fan-shaped limiting block (9); the right valve clack (2) comprises a sleeve in the middle and two sub-valve clacks which are respectively and symmetrically fixed on two sides of the sleeve, one side part, close to the center of the valve body pipeline (1), of the two sub-valve clacks on the two sides is a rectangular valve clack (202), one side part, far from the center of the valve body pipeline (1), is a circular-notch valve clack (203), an arc-shaped outer flange (204) is arranged on the outer side surface of the circular-notch valve clack (203) on one side, close to the fluid inlet, and the outer dimension of the arc-shaped outer flange (204) is larger than the inner dimension of the arc-shaped inner flange (102); the upper end and the lower end of the sleeve are provided with coaxial special-shaped mounting clamping grooves (201), the central axis of the special-shaped mounting clamping grooves (201) is used as a rotating shaft, the chuck (5) is fixed at the top of the valve body pipeline (1), the upper end of the rotating shaft (6) passes through the valve body pipeline (1) and the chuck (5) and then is connected with the hand wheel (4), the lower end of the rotating shaft (6) is rotatably inserted into the special-shaped mounting clamping grooves (201) at the upper end of the sleeve through a fan-shaped limiting block (9), the upper end of the rotating shaft (6) is rotatably sleeved with the chuck (5), and the upper end of the rotating shaft (6) is coaxially connected with the hand wheel (4); the upper end of the valve clack rotating shaft (7) is fixedly sleeved in a special-shaped mounting clamping groove (201) at the lower end of the sleeve, and the lower end of the valve clack rotating shaft (7) extends into the jack (101) and contacts with the top of a sealing bolt (8) in the jack (101); the upper end of the chuck (5) is provided with a central boss, the peripheral surface of the central boss is provided with an external spline (501), the lower end of the hand wheel (4) is provided with a stepped hole, the lower hole of the stepped hole is a large hole, the inner spline (402) is arranged on the inner wall of the lower hole of the stepped hole, the peripheral surface of the boss at the upper end of the chuck (5) is embedded in the lower hole of the stepped hole to form spline fit connection, and the hand wheel (4) can move up and down along the direction of a rotating shaft and then be connected with the chuck (5) or separated from the chuck (5) through the spline;

the special-shaped mounting clamping groove (201) formed in the upper end of the sleeve is formed by combining two semicircular holes with a large size and a small size, wherein the larger semicircular hole is arranged on one side of the sleeve, which is close to the fluid outlet, and two step blocking surfaces are formed between the larger semicircular hole and the smaller semicircular hole; the main body of the fan-shaped limiting block (9) is of a circular ring structure, an inner ring of the circular ring structure is coaxially connected with the rotating shaft (6), one side of the circular ring structure is fixedly provided with an arc-shaped protruding block accounting for 1/4 central angle, the arc-shaped protruding block is embedded in a larger semicircular hole in the special-shaped mounting clamping groove (201), and two ends of a protruding part of the arc-shaped protruding block are respectively provided with a left end face (901) and a right end face (902); the hand wheel (4) rotates to drive the sector limiting block (9) to rotate in the special-shaped mounting clamping groove (201) at the upper end of the sleeve through the rotating shaft (6), and drives the arc-shaped protruding block to move in a larger semicircular hole in the special-shaped mounting clamping groove (201), so that the left end face (901) and the right end face (902) are respectively matched and contacted between the two step blocking faces;

the right check valve clack assembly further comprises an upper fan-shaped magnet (10) and a lower fan-shaped magnet (11), wherein the upper fan-shaped magnet (10) is fixed on the lower end face of the valve clack rotating shaft (7), the lower fan-shaped magnet (11) is fixed on the top face of the sealing bolt (8), and the upper fan-shaped magnet (10) and the lower fan-shaped magnet (11) are arranged in a homopolar repulsion mode.

2. The double-flap check butterfly valve of claim 1, wherein:

the inner peripheral surface of the circular ring-shaped structure of the sector limiting block (9) is provided with a key groove (903), and the lower end of the rotating shaft (6) is provided with a convex key which is matched and connected with the key groove (903), so that the inner ring of the circular ring-shaped structure is coaxially connected with the rotating shaft (6).

3. The double-flap check butterfly valve of claim 1, wherein:

the upper end of the rotating shaft (6) is of a square column structure, the upper hole of the stepped hole at the lower end of the hand wheel (4) is of a square hole, the square column structure at the upper end of the rotating shaft (6) is inserted into the square hole at the lower end of the hand wheel (4) to form coaxial rotating connection, and the rotating shaft (6) and the hand wheel (4) can axially move, but circumferentially synchronously move.

4. The double-flap check butterfly valve of claim 1, wherein:

the chuck (5) is provided with angle lines (502) serving as scale display on the top surface around the central boss, and the outer circumferential surface of the lower end of the hand wheel (4) is provided with indication lines (401) which are axially arranged.

5. The double-flap check butterfly valve of claim 1, wherein:

the area of the rectangular valve clack (202) is larger than that of the circular-notch valve clack (203).

6. The double-flap check butterfly valve of claim 1, wherein:

the lower end surface of the valve clack rotating shaft is provided with a sector-shaped groove, and the lower part of the valve clack rotating shaft is made of a magnetism isolating material; a fan-shaped groove is formed in the top end face of the sealing bolt, a fan-shaped magnet is installed in the groove, and a magnetism isolating material for isolating magnetism of the magnet is arranged on the upper portion of the sealing bolt.