Differential gear transmission opening indicator for extension rod butterfly valve

Abstract

The invention relates to a differential gear transmission opening indicator for an extension rod butterfly valve. The differential gear transmission opening indicator comprises a box body, a gear disc located on the upper surface of the box body, an input shaft, a first gear, a second gear, a first gear ring and a second gear ring, wherein the input shaft, the first gear and the second gear are arranged in the box body, the first gear ring and the second gear ring are connected with the first gear and the second gear in a matched mode respectively, the first gear and the second gear are arranged coaxially, the first gear ring and the second gear ring are coaxial with the input shaft respectively, the first gear is arranged on the input shaft in a sleeving mode, the second gear is connected with the first gear in a spot welding mode, the modulus of the gears is equal to that of the gear rings, the number of teeth of the gears is less than that of the teeth of the gear rings, and the first gear ring is connected with a gear disc and drives the gear disc to rotate. Compared with the prior art, by means of the differential gear transmission opening indicator, the problem that it is difficult to know the opening and closing degree of a valve of an existing underground pipe network extension rod butterfly valve.

Description

technical field

[0001] The invention relates to a mechanical indication mechanism for the opening degree of a butterfly valve, in particular to a differential gear transmission opening indication device for an extension rod butterfly valve. Background technique

[0002] At present, most commonly used butterfly valves use a transmission device composed of a worm gear to control the opening and closing of the butterfly valve. The opening indicating device of the butterfly valve is set on the shaft end of the butterfly valve, the dial is fixed on the worm gear box, and the pointer is fixed on the worm gear. However, most butterfly valves in the underground pipe network are generally equipped with an extension rod on the input shaft of the worm gear box to extend to the ground for operation. It is difficult to judge the opening and closing degree of the valve from the appearance during operation. Because the degree of opening and closing is not known, it is easy to cause the va...

Examples

Embodiment

[0023] The differential gear transmission opening indicator device for extended rod butterfly valve, its structure is as follows Figure 1-4 As shown, the structure mainly includes an upper box body 16, a lower box body 13, a pointer 21, an input shaft 1 arranged in the box body, a first gear 3, a first ring gear 4, a second gear 8, a second ring gear 7, Pointer disc 2. In the middle of the input shaft 1 is an eccentric shaft section 14, the lower end surface 12 of the eccentric shaft section 14 is positioned on the lower box body 13 through the plane bearing 10, the input shaft 1 is connected to the drive shaft 20 of the butterfly valve extension rod through the key 11; the first gear 3 passes through The thrust bearing 17 is sleeved on the eccentric shaft section 14; the second gear 8 is fixed on the first gear 3 by spot welding 9, and the second gear 8 is concentric with the first gear 3; the first gear 3 and the second gear 8 The first ring gear 4 and the second ring gear...

technical field

[0001] The invention relates to a mechanical indication mechanism for the opening degree of a butterfly valve, in particular to a differential gear transmission opening indication device for an extension rod butterfly valve. Background technique

[0002] At present, most commonly used butterfly valves use a transmission device composed of a worm gear to control the opening and closing of the butterfly valve. The opening indicating device of the butterfly valve is set on the shaft end of the butterfly valve, the dial is fixed on the worm gear box, and the pointer is fixed on the worm gear. However, most butterfly valves in the underground pipe network are generally equipped with an extension rod on the input shaft of the worm gear box to extend to the ground for operation. It is difficult to judge the opening and closing degree of the valve from the appearance during operation. Because the degree of opening and closing is not known, it is easy to cause the va...

Examples

Embodiment

[0023] The differential gear transmission opening indicator device for extended rod butterfly valve, its structure is as follows Figure 1-4 As shown, the structure mainly includes an upper box body 16, a lower box body 13, a pointer 21, an input shaft 1 arranged in the box body, a first gear 3, a first ring gear 4, a second gear 8, a second ring gear 7, Pointer disc 2. In the middle of the input shaft 1 is an eccentric shaft section 14, the lower end surface 12 of the eccentric shaft section 14 is positioned on the lower box body 13 through the plane bearing 10, the input shaft 1 is connected to the drive shaft 20 of the butterfly valve extension rod through the key 11; the first gear 3 passes through The thrust bearing 17 is sleeved on the eccentric shaft section 14; the second gear 8 is fixed on the first gear 3 by spot welding 9, and the second gear 8 is concentric with the first gear 3; the first gear 3 and the second gear 8 The first ring gear 4 and the second ring gear...

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