A large-caliber triple-eccentric metal hard-sealed butterfly valve with an anti-resonance function

Abstract

The present invention provides an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, which relates to the technical field of butterfly valves and comprises: an outer cylinder, a base, a top cover, an oil cup and an anti-vibration cylinder; a card slot is provided on the inner wall of the outer cylinder, and two groups of grooves are provided at the left and right ends of the outer cylinder, and sealing rings are installed in the grooves; the base bolts are installed at the upper end of the outer cylinder, and a worm gear shaft is connected to the upper shaft of the base, and the worm gear on the worm gear shaft is one-fourth of the size of an ordinary worm gear; the position of a cleaning roller is adjusted by loosening a butterfly nut so that the cleaning roller contacts the worm, and when the worm is rotated, the cleaning roller can sweep the dust on the worm to prevent the worm from being covered with dust and causing difficulty in the rotation of the worm; a water hammer effect occurs when the sealing plate is opened and closed, and when a shock wave is transmitted into the buffer cylinder, the shock wave acts on the piston, and the piston moves upward, which can effectively eliminate irregular shock wave oscillations and prevent the butterfly valve from resonating with the water flow and generating noise when in use.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, and in particular to an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve. Background Art

[0002] The triple eccentric butterfly valve is a newly developed butterfly valve based on the double eccentric butterfly valve. There are three eccentric structures inside the butterfly valve, namely, the butterfly plate rotating shaft is relatively eccentric to the valve body centerline, the butterfly plate rotating shaft is relatively eccentric to the butterfly plate plane, and the conical sealing surface centerline is relatively eccentric to the valve centerline. This structure of the triple eccentric butterfly valve makes its regulating performance and sealing performance very good. However, the current triple eccentric butterfly valve mainly has two sealing structures. One is a soft seal, which uses a rubber sealing ring for sealing. This structure has good sealing performance, but is not resistant to high temperature, is easy to break and age, and has poor durability. The other is a hard seal, which uses a metal seal.

[0003] However, when the existing three-eccentric metal hard-sealed butterfly valve is in use, the control rod inside it is easy to rust, resulting in difficulty in opening and closing the valve, and the existing butterfly valve is easy to resonate with the water flow and generate noise when in use. Summary of the invention

[0004] In view of this, the present invention provides an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, which is provided with an arc hole on the top cover, an axial connecting rod is installed on the arc hole on the top cover, two groups of locking rings are installed on the axial connecting rod, a sleeve is installed between the two groups of locking rings, six groups of rollers are axially connected to the sleeve, and a cleaning roller is installed on the sleeve. When in use, the position of the cleaning roller is adjusted by loosening the butterfly nut so that the cleaning roller contacts the worm. When the worm is rotated, the cleaning roller can sweep the dust on the worm to prevent the worm from being covered with dust and causing difficulty in rotation of the worm.

[0005] The present invention provides an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, which specifically includes: an outer cylinder, a base, a top cover, an oil cup and an anti-vibration cylinder; a groove is provided on the inner wall of the outer cylinder, and two groups of grooves are provided at the left and right ends of the outer cylinder, and sealing rings are installed in the grooves; the base bolts are installed at the upper end of the outer cylinder, and a worm gear shaft is connected to the base shaft, and the worm gear on the worm gear shaft is one-fourth of the size of an ordinary worm gear; the top cover is installed at the upper end of the base, and semicircular holes are provided on the base and the top cover, bearings are installed on the semicircular holes, end covers are installed on the left and right ends of the bearings, and a worm is installed on the bearing, the worm is meshed with the worm gear shaft, a rocker is installed on the left end of the worm, an arc hole is provided on the top cover, and a cleaning roller is installed on the arc hole; the oil cup is installed at the upper end of the top cover; the anti-vibration cylinder bolts are installed at the left end of the outer cylinder.

[0006] Optionally, an inner cylinder is installed on the slot on the inner wall of the outer cylinder, a positioning cylinder is fixed to the lower end of the outer cylinder, a mounting cylinder is fixed to the upper end of the outer cylinder, a positioning column is installed in the positioning cylinder, and a bottom plate is bolted to the lower end of the positioning cylinder.

[0007] Optionally, a rotating rod is axially connected to the inner shaft of the installation cylinder, and a sealing plate is installed at the lower end of the rotating rod, two sets of sealing sleeves are installed on the rotating rod, and a groove is provided at the upper end of the installation cylinder, and a rubber pad is installed in the groove.

[0008] Optionally, a mounting groove is provided on the sealing plate, a metal ring is installed on the mounting groove, a baffle is installed on the sealing plate, the baffle bolts are installed on the sealing plate, and the metal ring is located between the baffle and the sealing plate.

[0009] Optionally, a spherical groove is provided on the semicircular holes on the base and the top cover, a positioning ball is fixed on the outer ring of the bearing, the positioning ball is engaged in the spherical groove, and a U-shaped seat is fixed on the upper end of the worm shaft.

[0010] Optionally, four sets of eyebolts are installed between the base and the top cover, and an axial connecting rod is installed on the arc hole on the top cover, two sets of locking rings are installed on the axial connecting rod, a sleeve is installed between the two sets of locking rings, six sets of rollers are axially connected to the sleeve, and the cleaning roller is installed on the sleeve.

[0011] Optionally, butterfly nuts are installed at the left and right ends of the shaft connecting rod, and a spring is installed between the butterfly nuts and the top cover.

[0012] Optionally, the lower end bolt of the oil cup is installed with a bracket, the bracket bolt is installed on the upper end of the top cover, and the upper end of the oil cup is provided with an oil filling pipe, a sealing plug is installed on the oil filling pipe, a rubber cap is installed on the upper end of the oil cup, and an oil dripping pipe is installed on the lower end of the oil cup. The lower end of the oil dripping pipe is inserted on the top cover and is located directly above the meshing point between the worm and the worm wheel shaft.

[0013] Optionally, a water outlet pipe is provided at the right end of the anti-vibration cylinder, a connecting ring is connected to the water outlet pipe, two sets of grooves are provided on the connecting ring, and the grooves are engaged with the sealing ring, a water inlet pipe is provided on the anti-vibration cylinder, and a coarse filter cartridge is installed at the upper end of the anti-vibration cylinder, a fine filter cartridge is installed at the lower end of the anti-vibration cylinder, the water inlet pipe is connected to the coarse filter cartridge, and the fine filter cartridge is connected to the water outlet pipe.

[0014] Optionally, a threaded cylinder is provided at the upper end of the anti-vibration cylinder, a buffer cylinder is threadedly screwed on the threaded cylinder, a circular plate is sealed at the upper end of the buffer cylinder, a pressure gauge is installed on the circular plate, a piston is installed in the buffer cylinder, and the buffer cylinder at the upper end of the piston is filled with air pressure.

[0015] Beneficial Effects

[0016] According to the three-eccentric metal hard-sealed butterfly valve of each embodiment of the present invention, compared with the traditional butterfly valve, an arc hole is provided on the top cover, an axial connecting rod is installed on the arc hole on the top cover, two groups of locking rings are installed on the axial connecting rod, a sleeve is installed between the two groups of locking rings, six groups of rollers are axially connected to the sleeve, and a cleaning roller is installed on the sleeve. When in use, the position of the cleaning roller is adjusted by loosening the butterfly nut so that the cleaning roller contacts the worm. When the worm is rotated, the cleaning roller can sweep the dust on the worm to prevent the worm from being covered with dust and causing difficulty in rotating the worm.

[0017] In addition, a threaded cylinder is provided at the upper end of the anti-vibration cylinder of the present invention, a buffer cylinder is threadedly screwed on the threaded cylinder, a circular plate is sealed at the upper end of the buffer cylinder, a pressure gauge is installed on the circular plate, and a piston is installed in the buffer cylinder. The buffer cylinder at the upper end of the piston is filled with air pressure, and a water hammer effect will occur when the sealing plate is opened and closed. When a shock wave is transmitted into the buffer cylinder, the shock wave acts on the piston, and the piston will move toward the upper end, which can effectively eliminate irregular shock wave oscillations and prevent the butterfly valve from resonating with the water flow and generating noise when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0019] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached picture:

[0021] Figure 1 A schematic diagram showing the overall structure of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention;

[0022] Figure 2 It shows a structural schematic diagram of the left end of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of an inner cylinder of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0024] Figure 4 The invention shows an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention. Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 5 A schematic structural diagram of an outer cylinder of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0026] Figure 6The invention shows an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention. Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 7 A schematic structural diagram of a connecting ring of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0028] Figure 8 A schematic structural diagram of a sealing plate of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0029] Fig. 9 A schematic structural diagram of a base of a large-caliber, anti-resonance, triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0030] Fig.10 A schematic structural diagram of a bearing of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0031] Fig.11 The invention shows an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention. Fig. 9 Schematic diagram of the enlarged structure at C in the middle;

[0032] Fig.12 A schematic structural diagram of a cleaning roller of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0033] Fig.13 A schematic structural diagram of an anti-vibration cylinder of an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention is shown;

[0034] Fig.14 The invention shows an anti-resonance large-caliber triple-eccentric metal hard-sealed butterfly valve according to an embodiment of the present invention. Fig.13 Schematic diagram of the enlarged structure at D in the middle.

[0035] Reference numerals list

[0036] 1. Outer tube; 101. Slot; 1011. Sealing ring; 102. Positioning tube; 1021. Positioning column; 1022. Bottom plate; 103. Inner tube; 1031. Sealing plate; 10311. Metal ring; 1032. Rotating rod; 10321. Sealing sleeve; 1033. Baffle; 104. Connecting ring; 105. Mounting tube; 1051. Rubber pad; 2. Base; 201. Worm shaft; 202. U-shaped seat; 203. Bearing; 2031. End cover; 2032. Positioning ball; 204. Worm; 205. Rocker; 3. Top Cover; 301, eyebolt; 302, shaft connecting rod; 3021, butterfly nut; 3022, spring; 303, sleeve; 3031, roller; 3032, locking ring; 3033, cleaning roller; 4, oil cup; 401, bracket; 402, rubber cap; 403, oil filling pipe; 4031, sealing plug; 5, vibration-proof cylinder; 501, water inlet pipe; 5011, coarse filter cylinder; 502, water outlet pipe; 5021, fine filter cylinder; 503, threaded cylinder; 504, buffer cylinder; 5041, round plate; 5042, piston; 5043, barometer. DETAILED DESCRIPTION

[0037] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0038] Example: Please refer to Figures 1 to 14 :

[0039] The present invention proposes an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, comprising: an outer cylinder 1, a base 2, a top cover 3, an oil cup 4 and an anti-vibration cylinder 5; a groove 101 is provided on the inner wall of the outer cylinder 1, and two groups of grooves are provided at the left and right ends of the outer cylinder 1, and a sealing ring 1011 is installed in the groove, an inner cylinder 103 is installed on the groove 101 on the inner wall of the outer cylinder 1, and a positioning cylinder 102 is fixed at the lower end of the outer cylinder 1, and a mounting cylinder 101 is fixed at the upper end of the outer cylinder 1. 05, a positioning column 1021 is installed in the positioning cylinder 102, and the lower end of the positioning cylinder 102 is bolted with a bottom plate 1022. A rotating rod 1032 is axially connected to the mounting cylinder 105, and a sealing plate 1031 is installed at the lower end of the rotating rod 1032. Two sets of sealing sleeves 10321 are installed on the rotating rod 1032. A groove is provided at the upper end of the mounting cylinder 105, and a rubber pad 1051 is installed in the groove. A mounting groove is provided on the sealing plate 1031, and a metal ring 10311 is installed on the mounting groove, and a baffle 1033 is installed on the sealing plate 1031. The baffle 1033 is bolted on the sealing plate 1031, and the metal ring 10311 is located between the baffle 1033 and the sealing plate 1031; the base 2 is bolted to the upper end of the outer cylinder 1, and a worm gear shaft 201 is axially connected to the base 2. The worm gear on the worm gear shaft 201 is one-fourth of an ordinary worm gear; the top cover 3 is installed at the upper end of the base 2, and the base 2 and the top cover 3 are provided with semicircular holes, bearings 203 are installed on the semicircular holes, end covers 2031 are installed on the left and right ends of the bearings 203, and a worm 204 is installed on the bearing 203, the worm 204 is meshed with the worm shaft 201, and a rocker 205 is installed on the left end of the worm 204, an arc hole is provided on the top cover 3, and a cleaning roller 3033 is installed on the arc hole; the oil cup 4 is installed on the upper end of the top cover 3; the anti-vibration cylinder 5 is bolted to the left end of the outer cylinder 1.

[0040] like Fig. 9 and Fig.10 As shown, spherical grooves are provided on the semicircular holes on the base 2 and the top cover 3, a positioning ball 2032 is fixed on the outer ring of the bearing 203, the positioning ball 2032 is engaged in the spherical groove, and a U-shaped seat 202 is fixed on the upper end of the worm shaft 201, whose function is: the setting of the spherical groove and the positioning ball 2032 can fix the outer ring of the bearing 203 to prevent the outer ring of the bearing 203 from moving between the base 2 and the top cover 3.

[0041] like Fig.11 and Fig.12As shown, four groups of eyebolts 301 are installed between the base 2 and the top cover 3, and an axial connecting rod 302 is installed on the arc hole on the top cover 3, two groups of locking rings 3032 are installed on the axial connecting rod 302, a sleeve 303 is installed between the two groups of locking rings 3032, six groups of rollers 3031 are axially connected to the sleeve 303, a cleaning roller 3033 is installed on the sleeve 303, butterfly nuts 3021 are installed on the left and right ends of the axial connecting rod 302, and a spring 3022 is installed between the butterfly nut 3021 and the top cover 3, and its function is: by loosening the butterfly nut 3021, the position of the cleaning roller 3033 is adjusted to make the cleaning roller 3033 contact with the worm 204. When the worm 204 is rotated, the cleaning roller 3033 can sweep the dust on the worm 204 to prevent the worm 204 from being covered with dust and causing difficulty in rotation of the worm 204.

[0042] like Fig. 9 As shown, the lower end of the oil cup 4 is bolted with a bracket 401, and the bracket 401 is bolted to the upper end of the top cover 3, and an oil filling pipe 403 is provided at the upper end of the oil cup 4, and a sealing plug 4031 is installed on the oil filling pipe 403, a rubber cap 402 is installed at the upper end of the oil cup 4, and an oil dripping pipe is installed at the lower end of the oil cup 4. The lower end of the oil dripping pipe is inserted into the top cover 3 and is located directly above the meshing position of the worm 204 and the worm wheel shaft 201. Its function is to squeeze the lubricating oil in the oil cup 4 to the meshing position of the worm 204 and the worm wheel shaft 201 by squeezing the rubber cap 402, so as to achieve lubrication of the worm 204 and the worm wheel shaft 201.

[0043] like Fig.13 and Fig.14 As shown, the right end of the anti-vibration cylinder 5 is provided with a water outlet pipe 502, the water outlet pipe 502 is connected with a connecting ring 104, the connecting ring 104 is provided with two groups of grooves, and the grooves are engaged with the sealing ring 1011, the anti-vibration cylinder 5 is provided with a water inlet pipe 501, and a coarse filter cartridge 5011 is installed on the upper end of the anti-vibration cylinder 5, and a fine filter cartridge 5021 is installed on the lower end of the anti-vibration cylinder 5, the water inlet pipe 501 is connected with the coarse filter cartridge 5011, and the fine filter cartridge 5021 is connected with the water outlet pipe 502, and the upper end of the anti-vibration cylinder 5 is provided with a threaded cylinder 503, and the threaded cylinder 503 is threadedly screwed with a buffer cylinder 504 The upper end of the buffer cylinder 504 is sealed with a circular plate 5041, a pressure gauge 5043 is installed on the circular plate 5041, and a piston 5042 is installed in the buffer cylinder 504. The buffer cylinder 504 at the upper end of the piston 5042 is filled with air pressure, which has the following functions: when the sealing plate 1031 is opened and closed, a water hammer effect will occur. When a shock wave is transmitted into the buffer cylinder 504, the shock wave acts on the piston 5042, and the piston 5042 will move upward, which can effectively eliminate irregular shock wave oscillations and prevent the butterfly valve from resonating with the water flow and generating noise when in use.

[0044] Specific usage and function of this embodiment: In the present invention, the water inlet pipe 501 is connected to the pipeline. When in use, the rocker 205 is turned to rotate the worm 204, so that the worm shaft 201 is rotated, thereby rotating the rotating rod 1032, and the real-time sealing plate 1031 is rotated to realize the opening or closing of the butterfly valve. The position of the cleaning roller 3033 is adjusted by loosening the butterfly nut 3021, so that the cleaning roller 3033 contacts the worm 204. When the worm 204 is rotated, the cleaning roller 3033 can sweep the dust on the worm 204 to prevent the worm 204 from being covered with dust and causing difficulty in rotating the worm 204. By squeezing the rubber The cap 402 squeezes the lubricating oil in the oil cup 4 to the meshing position of the worm 204 and the worm gear shaft 201, thereby lubricating the worm 204 and the worm gear shaft 201. A water hammer effect occurs when the sealing plate 1031 is opened and closed. When a shock wave is transmitted into the buffer cylinder 504, the shock wave acts on the piston 5042, and the piston 5042 moves upward, which can effectively eliminate irregular shock wave oscillations and prevent the butterfly valve from resonating with the water flow and generating noise when in use. The setting of the spherical groove and the positioning ball 2032 can fix the outer ring of the bearing 203 to prevent the outer ring of the bearing 203 from moving between the base 2 and the top cover 3.

[0045] Finally, it should be noted that when describing the position of each component and the matching relationship between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such position, matching relationship, etc. are also applicable to other components / other pairs of components.

[0046] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, characterized in that: include: An outer cylinder (1), a base (2), a top cover (3), an oil cup (4) and an anti-vibration cylinder (5); a groove (101) is provided on the inner wall of the outer cylinder (1), and two groups of grooves are provided at the left and right ends of the outer cylinder (1), and sealing rings (1011) are installed in the grooves; the base (2) is bolted to the upper end of the outer cylinder (1), and a worm gear shaft (201) is connected to the upper shaft of the base (2); the top cover (3) is installed on the upper end of the base (2), and the base (2) and the top cover (3) are provided with semicircular holes, and the semicircular holes are provided in the base (2). A bearing (203) is mounted on the circular hole, end covers (2031) are mounted on the left and right ends of the bearing (203), a worm (204) is mounted on the bearing (203), the worm (204) is meshed with the worm wheel shaft (201), a rocker (205) is mounted on the left end of the worm (204), an arc-shaped hole is provided on the top cover (3), a cleaning roller (3033) is mounted on the arc-shaped hole; the oil cup (4) is mounted on the upper end of the top cover (3); the anti-vibration cylinder (5) is bolted to the left end of the outer cylinder (1); Four groups of eyebolts (301) are installed between the base (2) and the top cover (3), and a shaft connecting rod (302) is installed on the arc hole on the top cover (3), two groups of locking rings (3032) are installed on the shaft connecting rod (302), a sleeve (303) is installed between the two groups of locking rings (3032), six groups of rollers (3031) are axially connected to the sleeve (303), and the cleaning roller (3033) is installed on the sleeve (303); The right end of the anti-vibration cylinder (5) is provided with a water outlet pipe (502), the water outlet pipe (502) is connected to a connecting ring (104), the connecting ring (104) is provided with two groups of grooves, and the grooves are engaged with the sealing ring (1011), the anti-vibration cylinder (5) is provided with a water inlet pipe (501), and a coarse filter cartridge (5011) is installed at the upper end of the anti-vibration cylinder (5), and a fine filter cartridge (5021) is installed at the lower end of the anti-vibration cylinder (5), and the water inlet pipe (501) is connected to the coarse filter cartridge (5011). The fine filter cylinder (5021) is connected to the water outlet pipe (502), the upper end of the anti-vibration cylinder (5) is provided with a threaded cylinder (503), a buffer cylinder (504) is threadedly screwed on the threaded cylinder (503), the upper end of the buffer cylinder (504) is sealed with a circular plate (5041), a pressure gauge (5043) is installed on the circular plate (5041), and a piston (5042) is installed in the buffer cylinder (504), and the buffer cylinder (504) at the upper end of the piston (5042) is filled with air pressure.

2. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 1, characterized in that: An inner cylinder (103) is mounted on the clamping groove (101) on the inner wall of the outer cylinder (1), a positioning cylinder (102) is fixed at the lower end of the outer cylinder (1), a mounting cylinder (105) is fixed at the upper end of the outer cylinder (1), a positioning column (1021) is mounted in the positioning cylinder (102), and a bottom plate (1022) is bolted to the lower end of the positioning cylinder (102).

3. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 2, characterized in that: The mounting tube (105) is axially connected to a rotating rod (1032), and a sealing plate (1031) is installed at the lower end of the rotating rod (1032). Two sets of sealing sleeves (10321) are installed on the rotating rod (1032). The upper end of the mounting tube (105) is provided with a groove, and a rubber pad (1051) is installed in the groove.

4. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 3, characterized in that: The sealing plate (1031) is provided with a mounting groove, a metal ring (10311) is mounted on the mounting groove, and a baffle (1033) is mounted on the sealing plate (1031), the baffle (1033) is bolted to the sealing plate (1031), and the metal ring (10311) is located between the baffle (1033) and the sealing plate (1031).

5. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 1, characterized in that: The semicircular holes on the base (2) and the top cover (3) are provided with spherical grooves, a positioning ball (2032) is fixed on the outer ring of the bearing (203), the positioning ball (2032) is engaged in the spherical groove, and a U-shaped seat (202) is fixed on the upper end of the worm gear shaft (201).

6. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 1, characterized in that: Butterfly nuts (3021) are installed at the left and right ends of the shaft connecting rod (302), and a spring (3022) is installed between the butterfly nut (3021) and the top cover (3).

7. The large-caliber anti-resonance three-eccentric metal hard-sealed butterfly valve according to claim 1, characterized in that: The lower end of the oil cup (4) is bolted with a bracket (401), the bracket (401) is bolted with the upper end of the top cover (3), and an oil filling pipe (403) is provided at the upper end of the oil cup (4), a sealing plug (4031) is installed on the oil filling pipe (403), a rubber cap (402) is installed at the upper end of the oil cup (4), and an oil dripping pipe is installed at the lower end of the oil cup (4), the lower end of the oil dripping pipe is inserted into the top cover (3) and is located directly above the meshing position of the worm (204) and the worm wheel shaft (201).

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