CN204692714U - The many turning valves of magnetic coupling - Google Patents

Abstract

The utility model relates to a magnetically coupled multi-turn valve, which comprises a valve body, a valve plate, a valve stem, a valve cover and a driving mechanism. The lower end is axially fixed in the concave cavity on the upper end surface of the valve cover; mainly a magnetic coupling transmission mechanism is set between the valve stem and the driving mechanism. The magnetic coupling transmission mechanism is composed of an inner magnetic ring, an outer magnetic ring, an isolation cylinder and a transmission cylinder. ;The inner magnetic ring is fixedly installed on the outer surface of the upper end of the valve stem nut, the isolation cylinder is sealed and fixed on the upper end surface of the valve cover, the transmission cylinder is concentrically installed on the outer surface of the isolation cylinder, and the transmission cylinder and the isolation cylinder are fixed in the axial direction. The mechanism is fixedly connected to the center of the upper end face of the transmission cylinder, and the outer magnetic ring is fixedly installed on the inner wall of the transmission cylinder outside the inner magnetic ring. The middle cavity of the valve is a static sealing structure, which has the characteristics of long sealing life and zero leakage, and is suitable for control valves in special medium conditions such as dangerous goods where zero leakage is required.

Description

Magnetically coupled multi-turn valves

technical field

The utility model belongs to the field of valves, in particular to a multi-turn valve. The utility model is suitable for multi-turn opening and closing valves such as gate valves and globe valves.

Background technique

The driving mechanism of multi-turn opening and closing valves such as gate valve and globe valve has manual, electric, pneumatic and other driving mechanisms. End connection, between the middle of the stem and the bonnet is sealed by packing. Its main disadvantage is that the middle cavity of the valve between the valve stem and the bonnet is a dynamic sealing structure. During the long-term opening and closing process, the valve stem will wear the packing, which will cause leakage between the valve stem and the bonnet in the middle cavity of the valve. Cavity sealing reliability is poor.

Contents of the invention

The purpose of the utility model is to provide a magnetically coupled multi-turn valve with a static seal in the middle cavity of the valve and good sealing performance in the middle cavity, aiming at the shortcomings of the prior art.

The technical scheme of the utility model includes a valve body, a valve plate, a valve stem, a valve cover, and a driving mechanism. In the concave cavity on the end face of the cover; mainly a magnetic coupling transmission mechanism is set between the valve stem and the driving mechanism. The magnetic coupling transmission mechanism is composed of an inner magnetic ring, an outer magnetic ring, an isolation cylinder and a transmission cylinder; the inner magnetic ring is fixedly installed On the outer surface of the upper end of the stem nut, the isolation cylinder is sealed and fixed in the upper end surface of the valve cover. The transmission cylinder is concentrically installed on the outer surface of the isolation cylinder. The transmission cylinder and the isolation cylinder are axially fixedly connected, and the driving mechanism is fixedly connected to the transmission cylinder In the center of the upper end face, the outer magnetic ring is fixedly installed on the inner wall of the transmission cylinder outside the inner magnetic ring.

The utility model has the advantages that the valve stem and the driving mechanism adopt magnetic coupling transmission, the cavity in the valve body is sealed as a static seal between the isolation cylinder and the valve cover, the sealing reliability is good, and zero leakage is realized.

Description of drawings

Fig. 1 is a structural representation of the utility model.

1 valve body, 2 valve plate, 3 valve stem, 4 valve cover, 5 valve stem nut, 6 pressure ring, 7 inner magnetic ring, 8, outer magnetic ring, 9 transmission cylinder, 10 isolation cylinder, 11 driving mechanism.

Detailed ways

The magnetically coupled multi-turn valve shown in Figure 1 includes a valve body 1, a valve plate 2, a valve stem 3, a valve cover 4, and a driving mechanism 11. The lower end of the valve stem 3 is fixedly connected to the valve plate 2, and the valve plate 2 can use a gate The plate or disc and the valve seat in the valve body 1 cooperate and seal to form a gate valve or globe valve structure. The upper end of the valve stem 2 is threaded with the stem nut 5, and the lower end of the stem nut 5 is axially fixed in the cavity on the upper end surface of the valve cover 4. Inside, that is, the shoulder at the lower end of the stem nut 5 is pressed into the concave cavity on the upper end surface of the valve cover 4 by the pressure ring 6, and the pressure ring 6 is threadedly connected with the inner circular wall of the concave cavity on the upper end surface of the valve cover, so that the valve stem nut 5. It is fixed axially in the concave cavity of the upper end surface of the valve cover, and can rotate radially; a magnetic coupling transmission mechanism is set between the valve stem 3 and the driving mechanism 11. The magnetic coupling transmission mechanism consists of an inner magnetic ring 7, an outer magnetic ring 8, isolation cylinder 10 and transmission cylinder 9; the inner magnetic ring 7 is fixedly installed on the outer circular surface of the upper end of the valve stem nut 5, the inner magnetic ring 7 can be connected with the valve stem nut 5 through the fixing ring, and the fixing ring is fixedly installed on the valve stem On the outer surface of the nut 5, the inner magnetic ring 7 is fixedly installed on the outer surface of the fixed ring, the isolation cylinder 10 is sealed and fixed in the upper end surface of the valve cover 4, the transmission cylinder 9 is concentrically installed on the outer surface of the isolation cylinder 10, and the transmission cylinder 9 It is axially fixedly connected with the isolation cylinder 10, that is, the transmission cylinder 9 is axially fixed on the isolation cylinder 10, and can rotate in the circumferential direction, the driving mechanism 11 is fixedly installed on the center of the upper end face of the transmission cylinder 9, and the outer magnetic ring 8 is fixedly installed on the On the inner wall of the transmission cylinder 9 outside the inner magnetic ring 7, the driving mechanism 11 can adopt a manual mechanism, an electric mechanism, or a pneumatic mechanism. The driving mechanism 11 drives the transmission cylinder 9 to rotate, and through the magnetic coupling of the outer magnetic ring 8 and the inner magnetic ring 7, the valve The rod nut 5 rotates accordingly, and the transmission valve rod 3 rises.

Gaskets are respectively installed between the lower end surface of the bonnet 4 and the valve body 1 and between the upper end surface of the bonnet 4 and the lower end surface of the isolation cylinder 10 to realize sealing of the middle chamber. Since the middle cavity seal is a static seal, the sealing reliability and sealing life are improved, and the problem of wear on the sealing packing caused by the dynamic sealing structure between the valve stem and the packing in the existing valve is solved, and zero leakage of the valve is realized. Control valves for special medium working conditions such as dangerous goods in leakage occasions.

Claims (1)

1. the many turning valves of magnetic coupling, comprise valve body (1), valve plate (2), valve rod (3), valve gap (4), driving mechanism (11), valve rod (3) lower end is fixedly connected with valve plate (2), valve rod (2) upper end is threaded with Stem Mut (5), and Stem Mut (5) lower end is axially fixed in the cavity of valve gap (4) upper-end surface; It is characterized in that arranging magnetic coupling drive mechanism between valve rod (3) and driving mechanism (11), this magnetic coupling drive mechanism is made up of internal magnetic ring (7), outer magnetic ring (8), isolation cylinder (10) and drive cylinder (9); Internal magnetic ring (7) is fixedly mounted on Stem Mut (5) upper end periphery, isolation cylinder (10) sealing is fixed in valve gap (4) upper-end surface, drive cylinder (9) is arranged on isolation cylinder (10) periphery with one heart, between drive cylinder (9) with isolation cylinder (10), axial restraint is connected, driving mechanism (11) is fixedly mounted on drive cylinder (9) center, upper-end surface, and outer magnetic ring (8) is fixedly mounted on drive cylinder (9) inwall in internal magnetic ring (7) outside.