Four-connecting-rod butterfly valve

Abstract

The utility model provides a four-connecting-rod butterfly valve, and particularly relates to the technical field of connecting rod butterfly valves, the four-connecting-rod butterfly valve comprises a valve body, a valve shaft assembly, a butterfly plate component and a four-connecting-rod mechanism, a valve shaft does not penetrate through a connecting plate, and the four-connecting-rod butterfly valve is characterized in that the valve shaft assembly comprises a front connecting seat and a rear connecting seat which are symmetrically arranged, and self-lubricating bearings are assembled in the two connecting seats respectively; the valve shaft is installed in an axial positioning mode through the self-lubricating bearing. The butterfly plate assembly comprises a trapezoidal connecting seat and a butterfly plate with a counterweight groove, and an adjustable counterweight block is embedded in the counterweight groove; the large connecting rod double-flat-key anti-loose connection is matched with the two sets of symmetrical small connecting rods, single-side stress deviation is eliminated, opening and closing synchronism of the butterfly plate is guaranteed, the large connecting rod and the valve shaft are doubly fixed through the double-flat-key and anti-loose rubber layer, the angle dial is matched with the end, accurate opening adjustment and long-term anti-loose are achieved, opening and closing actions are stable and flexible, and the safety of the butterfly plate is guaranteed. And high-frequency operation conditions are adapted.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting rod butterfly valve technical field, concretely relates to a four connecting rod butterfly valve. BACKGROUND

[0002] As a commonly used fluid control device, the butterfly valve is widely used in petroleum chemical industry, electric power, water supply and drainage and other industrial pipeline systems due to its compact structure and rapid opening and closing characteristics. The traditional butterfly valve usually adopts a single valve rod to drive the valve plate rotation structure, when affected by temperature change in the application process, the connecting plate connected with the valve deforms or fever rubs, the valve movement moment is increased, and finally the valve cannot be opened.

[0003] The existing Chinese utility model with the application number CN202322995038.4 connecting plate and shaft without friction four connecting rod heat preservation valve, including valve body and valve shaft B, valve shaft B is arranged on the valve body, valve shaft B is connected with butterfly plate through connecting rod mechanism, connecting rod mechanism includes connecting plate B, connecting plate B is connected with the support plate arranged on the valve body, valve shaft B rotation drives connecting rod mechanism to drive butterfly plate movement, and then controls the valve opening or closing;The valve shaft B does not pass through the connecting plate B;The application does not pass through the connecting plate, and does not rub with the connecting plate to cause the valve to be unable to open.

[0004] But the above-mentioned utility model patent still has the following problems: the connecting rod mechanism has insufficient synchronism, the small connecting rod is bent when stressed, which easily causes the pin shaft to swing and the valve to be not tightly sealed, and the opening and closing is blocked;The valve rotation angle is difficult to control accurately, which easily causes the opening and closing to be not in place, and affects the flow regulation accuracy;It is unable to adjust the balance of the butterfly plate by controlling different medium flow;The large connecting rod is sleeved on the valve shaft without any connecting mode, which is easily separated and unable to adapt to high-frequency operation conditions;Only the steam flange cannot reduce heat loss, and the heat preservation effect is achieved.

[0005] In order to improve the above-mentioned technical problems, the utility model solves the technical problems: providing a four connecting rod butterfly valve, the small connecting rod is improved by double connecting plate clamping, the pin shaft is no longer bent and more stable, the valve is sealed, and the opening and closing is flexible;Through high synchronism four connecting rod drive, the synchronism of butterfly plate opening and closing is ensured, and the opening and closing action is stable and flexible;Add high-efficiency heat preservation anti-coking design, reduce heat loss and medium crystallization adhesion, and avoid valve cavity blockage. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a four connecting rod butterfly valve to solve the problems in the above background.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a four connecting rod butterfly valve, including valve body, valve shaft assembly, butterfly plate component and four connecting rod mechanism, valve shaft does not pass through connecting plate, steam flange and pressing plate, its characterized in that: valve shaft assembly includes symmetrically arranged front joint seat and rear joint seat, and two joint seat inner parts are respectively assembled self -lubricating bearing, and valve shaft realizes axial positioning type installation through self -lubricating bearing;

[0008] Butterfly plate component includes trapezoidal connecting seat and butterfly plate with counterweight groove, and counterweight groove is embedded with adjustable counterweight block;

[0009] Valve shaft drives butterfly plate through four connecting rod mechanism, and four connecting rod mechanism includes big connecting rod with valve shaft key connection, two groups of small connecting rods symmetrically distributed in the both sides of big connecting rod, connecting plate clamping one end of small connecting rod and support plate fixed on valve body, and each connecting rod connection is equipped with pin shaft.

[0010] Preferably, the big connecting rod and the valve shaft are connected by double flat keys, the key groove is provided with an anti-loosening glue layer, and the end of the big connecting rod is provided with an angle scale disc.

[0011] Preferably, the free end of the big connecting rod is rotatably connected to the trapezoidal connecting seat fixedly arranged on the butterfly plate through the pin shaft A.

[0012] Preferably, the two groups of small connecting rods are rotatably connected to the trapezoidal connecting seat through the pin shaft B, and the other end is rotatably connected by clamping two connecting plates through the pin shaft C, so that the connecting plates and the pin shaft C are not bent by force, the synchronization of the connecting rod mechanism is enhanced, the other end of the connecting plate is fixedly connected to the support plate through bolts, the support plate is fixed on the valve body, the valve is first translated and then rotated when opened, and first rotated and then translated when closed, so that the sealing effect is better and the service life is longer.

[0013] Preferably, the steam flange is connected to the annular steam passage, the passage is provided with spiral guide vanes, and the outside of the passage is provided with a heat preservation layer.

[0014] Preferably, disc springs are arranged between the pressing plate and the butterfly plate, each group has three stacked springs, and a positioning column is arranged in the center hole of the disc spring group.

[0015] Preferably, the self-lubricating bearings arranged in the front joint seat and the rear joint seat are bidirectional thrust bearings, and lubrication injection holes are formed in the end faces of the self-lubricating bearings.

[0016] The utility model has the advantages that:

[0017] 1. Frictionless axial positioning structure: The valve shaft can rotate without friction by embedding self-lubricating bearings in the symmetrically arranged front and rear seats. The self-lubricating thrust bearing is combined with the oil injection hole on the end face, which can bear axial load in both directions and facilitate lubrication and maintenance. It can adapt to high temperature and pressure alternating working conditions, reduce wear, extend service life, and at the same time, axial positioning can prevent valve shaft misalignment and improve sealing reliability.

[0018] 2. Dynamic balance adjustment capability: The adjustable counterweight block embedded in the counterweight groove of the butterfly plate can adjust the torque balance of the butterfly plate for different media flow rates, reduce opening and closing vibration, and extend the service life of the sealing surface.

[0019] 3. High Synchronization Four-Bar Drive: The large connecting rod is connected by a double flat key to prevent loosening, and two sets of symmetrical small connecting rods are used to eliminate the force deviation on one side and ensure the synchronous opening and closing of the butterfly plate. The large connecting rod and the valve shaft are double fixed with double flat keys and anti-loosening rubber layer. With the angle scale on the end, a precise opening adjustment section and long-term anti-loosening are achieved. The switching action is smooth and flexible and adaptable to high-frequency operation conditions.

[0020] 4. Anti-eccentric load linkage layout: The small linkage is linked with the clamp-type connecting plate pin through the trapezoidal connecting plate to distribute the force direction, avoid swaying and bending, improve the rigidity of the mechanism and the anti-eccentric load capacity, ensure valve sealing and flexible opening and closing.

[0021] 5. High-efficiency heat preservation and anti-coking design: The spiral guide vanes in the steam channel extend the medium path, and together with the external heat preservation layer, reduce heat loss and medium crystallization adhesion, avoid valve cavity blockage. The stacked structure of the disc spring group provides non-linear elasticity to compensate for the wear gap between the disc plate and the valve body. The positioning column prevents the spring from deflecting and ensures a long-lasting fit of the sealing surface. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the front cross-section structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the side cross-sectional structure of this utility model;

[0024] Figure 3 for Figure 2 Enlarged view of section AA in the schematic diagram;

[0025] Figure 4 This is a schematic cross-sectional view of the valve shaft and connecting rod of this utility model;

[0026] Figure 5 This is a schematic cross-sectional view of the self-lubricating bearing of this utility model;

[0027] Figure 6 This is a schematic diagram showing the connection between the small connecting rod and the connecting plate of this utility model.

[0028] The components in the attached diagram are labeled as follows: 1: Valve body; 21: Front connector; 22: Rear connector; 23: Self-lubricating bearing; 231: Lubrication injection hole; 24: Valve shaft; 31: Butterfly plate; 32: Trapezoidal connecting seat; 33: Counterweight groove; 34: Anti-loosening rubber layer; 35: Angle scale; 41: Main connecting rod; 42: Small connecting rod; 43: Connecting plate; 44: Pin A; 45: Pin B; 46: Pin C; 47: Support plate; 51: Steam flange; 52: Spiral guide vane; 53: Insulation layer; 6: Pressure plate; 7: Disc spring assembly; 8: Positioning pin. Detailed Implementation

[0029] Although this invention may be described with respect to a particular application or industry, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0030] This utility model is as follows Figures 1-6 The four-bar butterfly valve shown includes a valve body 1, a valve shaft assembly, a butterfly plate assembly, and a four-bar linkage mechanism. The valve shaft 24 does not pass through the connecting plate 43. A front connector 21 and a rear connector 22 are symmetrically welded to both ends of the valve body 1, with a bidirectional self-lubricating bearing 23 press-fitted into each of their inner bores. Both ends of the valve shaft 24 pass through the inner bores of the self-lubricating bearings 23. A large connecting rod 41 is fixed to the middle section of the valve shaft 24 via a double flat key. An anti-loosening adhesive layer is provided in the keyway. The free end of the large connecting rod 41 is connected to the trapezoidal connecting seat 32 of the butterfly plate assembly via a pin A44. The valve shaft 24 rotates to drive the large connecting rod 41, which in turn drives the trapezoidal connecting seat 32 and the butterfly plate 31 to rotate via pin A44. The trapezoidal connecting seat 32 of the butterfly plate 31 has counterweight grooves 33 at both ends, with counterweight blocks embedded in the grooves. One end of the two sets of small connecting rods 42 is rotatably connected to both sides of the trapezoidal connecting seat 32 via pin B45, and the other end is held by two parallel connecting plates 43 and rotatably connected via pin C46. The other end of the connecting plate 43 is fixedly connected to the support plate 47 by bolts.

[0031] A 180° symmetrical flat keyway is opened at the key connection between the main connecting rod 41 and the valve shaft 24. After the flat keyway is assembled, an anti-loosening adhesive layer 34 is applied. An angle scale 35 is engraved at the end of the main connecting rod 41. An angle marking line from 0° to 90° is engraved on the surface of the scale, and a pointer is provided to fix it to the end face of the valve shaft 24 to realize the visual calibration of the opening degree of the butterfly plate 31.

[0032] Two groups of small connecting rods 42 are rotatably connected with the trapezoidal connecting seat 32 through pin shaft B45, and the other end of the small connecting rod 43 is clamped by two connecting plates 43 of the same thickness and is rotatably connected through pin shaft C46, so as to avoid the bending moment of the traditional single plate structure and avoid the swing bending. The other end of the connecting plate 43 is fixedly connected with the supporting plate 47 through a bolt, and the supporting plate 47 is fixed on the valve body 1. The lifting mechanism has rigidity and anti-unbalanced load capacity. When the valve is opened, it first translates and then rotates, and when it is closed, it first rotates and then translates, so as to ensure the sealing of the valve and the flexible opening and closing.

[0033] The inner side of the steam flange 51 of the valve body 1 is processed into an annular steam chamber, the cavity is welded with a 304 stainless steel spiral flow guide 52, and the outer side is provided with a heat preservation layer 53. The spiral flow guide 52 increases the residence time of the steam, and the additional heat preservation layer 53 greatly reduces the temperature loss.

[0034] The disc spring group 7 is installed between the pressing plate 6 and the butterfly plate 31. Each group has three springs stacked together in the order of positive, negative and positive. The center positioning column 8 is a stepped structure, the small end is in clearance fit with the butterfly plate 31, and the large end is threadedly connected with the pressing plate 6. The pre-tightening force of the disc spring group is adjusted through the nut of the positioning column 8. The positioning column 8 prevents the spring from being deflected, and ensures that the sealing surface is durable and attached.

[0035] The self-lubricating bearing 23 arranged in the front and rear connecting seats 21 and 22 is a bidirectional thrust bearing. Lubrication injection holes 231 are formed in the end face of the bearing seat. The self-lubricating thrust bearing is combined with the oil injection hole in the end face, and can bear bidirectional axial load and be conveniently lubricated and maintained, thereby reducing wear and prolonging service life.

[0036] Working principle: The actuator drives the valve shaft 24 to rotate, which drives the large connecting rod 6 to move synchronously through the double flat keys. The large connecting rod 41 pulls the trapezoidal connecting seat 32 through the pin shaft A44. The two small connecting rods 42 form parallel quadrilateral movement under the constraint of the connecting plate 43, so that the butterfly plate 31 swings around the sealing surface of the valve body 1, and the valve is opened and closed. The counterweight is adjusted according to the medium flow rate to offset the inertial moment of the butterfly plate 31 and reduce vibration. The disc spring group 7 is deformed under pressure to provide adaptive sealing force and compensate for wear. The valve shaft 24 is supported by the bidirectional thrust self-lubricating bearing 23. The self-lubricating bearing reduces the closing torque. The lubrication injection hole 231 is regularly supplemented with lubricating grease to prolong the service life of the bearing. The steam flange 51 is formed into a spiral flow by the spiral flow guide 52, uniformly heating the valve cavity. The spiral flow guide 52 increases the residence time of the steam, and the heat preservation layer 53 maintains the temperature to prevent the medium from condensing and forming scale.

[0037] The above-described embodiments only express the preferred embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications, improvements and substitutions can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A four-bar linkage butterfly valve comprising a valve body (1), a valve shaft assembly, a butterfly plate assembly and a four-bar linkage mechanism, a valve shaft (24) not passing through a connecting plate (43), a steam flange (51) and a pressing plate (6), characterized in that: The valve shaft assembly comprises front and rear sockets (21, 22) symmetrically arranged, and self-lubricating bearings (23) are respectively arranged in the sockets, and the valve shaft (24) is axially positioned and mounted through the self-lubricating bearings (23). The butterfly plate assembly comprises a trapezoidal connecting seat (32) and a butterfly plate (31) with a counterweight groove (33), and an adjustable counterweight block is embedded in the counterweight groove (33). The valve shaft drives the butterfly plate through a four-bar linkage mechanism, the four-bar linkage mechanism comprises a large connecting rod (41) in key connection with the valve shaft (24), two groups of small connecting rods (42) symmetrically arranged on both sides of the large connecting rod (41), connecting plates (43) clamping one end of the small connecting rods (42), and a support plate (47) fixed on the valve body (1), and a pin is arranged at each connecting position of the connecting rods.

2. A four-bar linkage butterfly valve as claimed in claim 1, wherein: The large connecting rod (41) is connected with the valve shaft (24) through double flat keys, a lock glue layer (34) is arranged in the key groove, and an angle scale dial (35) is arranged at the end of the large connecting rod (41).

3. A four-bar linkage butterfly valve as defined in claim 1, wherein: The free end of the large connecting rod (41) is rotatably connected with the trapezoidal connecting seat (32) fixedly arranged on the butterfly plate (31) through a pin A (44).

4. A four-bar linkage butterfly valve as defined in claim 1, wherein: The two groups of small connecting rods (42) are rotatably connected on the trapezoidal connecting seat (32) through a pin B (45), and the other end is rotatably connected through a pin C (46) by clamping two connecting plates (43), so that the connecting plates (43) and the pin C (46) are not bent by force, the synchronization of the linkage mechanism is enhanced, the other end of the connecting plate (43) is fixedly connected with the support plate (47) through a bolt, and the support plate (47) is fixed on the valve body (1). When the valve is opened, it first translates and then rotates, and when it is closed, it first rotates and then translates, so that the sealing effect is better and the service life is longer.

5. A four-bar linkage butterfly valve as defined in claim 1, wherein: The steam flange (51) is connected with the annular steam passage, the passage is provided with a spiral guide vane (52), and the outside of the passage is provided with a heat preservation layer (53).

6. A four-bar linkage butterfly valve as defined in claim 1, wherein: A disc spring group (7) is arranged between the pressing plate (6) and the butterfly plate (31), each group has three springs stacked, and a positioning column (8) is arranged in the center hole of the disc spring group (7).

7. A four-bar linkage butterfly valve as defined in claim 1, wherein: The self-lubricating bearings (23) arranged in the front and rear sockets (21, 22) are bidirectional thrust bearings, and lubrication injection holes (231) are arranged on the end faces of the self-lubricating bearings (23).

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