CN211343538U - A permanent magnet spring type relief valve pilot valve - Google Patents

Abstract

The utility model relates to a permanent magnet spring overflow valve pilot valve belongs to hydraulic transmission technical field. The utility model discloses by hexagonal end cap, valve body, case, adjusting screw, end cover, hand wheel, permanent magnet I, permanent magnet II. The hexagonal plug is inserted into one end of the valve body, the valve core is inserted into the other end of the valve body, an adjusting screw is further installed at one end of the valve body, which is connected with the valve core, the adjusting screw is not in contact with the valve core, a permanent magnet is arranged between the adjusting screw and the valve core, the permanent magnet I is connected with the adjusting screw, and the permanent magnet II is connected with the valve core; the end cover penetrates through the adjusting screw rod and fixes the adjusting screw rod on the valve body, and a hand wheel is installed at one end of the adjusting screw rod, which extends out of the end cover. The utility model discloses simple structure, no fatigue failure have guaranteed the normal work of pilot valve, and the reaction is sensitive, has reduced pilot valve loss of pressure, and the case vibration is little, has promoted overflow valve constant pressure precision.

Description

A permanent magnet spring type relief valve pilot valve

technical field

The utility model relates to a permanent magnet spring type relief valve pilot valve, which belongs to the technical field of hydraulic transmission.

Background technique

Pilot-operated relief valve is a type of hydraulic pressure control valve, which plays the role of constant pressure relief, voltage stabilization, system unloading and safety protection in the hydraulic system. The performance, reliability and life of the pilot valve will directly affect the safety and efficiency of the pilot relief valve.

Existing pilot valves often use mechanical coil springs. The springs and valve cores are subject to long-term action of the pressure fluid, and the springs are prone to fatigue failure, causing the springs and valve cores to vibrate, resulting in unstable system pressure and affecting the control accuracy of the hydraulic system; spring fatigue fractures Failure will result in the pilot operated relief valve not functioning properly. Permanent magnet spring has the characteristics of simple structure, short force transmission route, no fatigue wear, etc. It is used in pilot valve to replace mechanical spring to improve opening and closing characteristics, reduce pressure loss, reduce vibration and prolong service life.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide a permanent magnet spring type overflow valve pilot valve, which is used to solve the problem that the fatigue fracture failure of the mechanical spring affects the normal operation of the overflow valve.

The technical scheme of the utility model is: a permanent magnet spring type relief valve pilot valve, which consists of a hexagonal plug, a valve body, a valve core, an adjusting screw, an end cover, a hand wheel, a permanent magnet I, and a permanent magnet II. The hexagonal plug is inserted into one end of the valve body, the valve core is inserted into the other end of the valve body, and the end connecting the valve body and the valve core is also equipped with an adjusting screw, which is not in contact with the valve core, and there is a permanent magnet between the two. I is connected with the adjusting screw, and the permanent magnet II is connected with the valve core; the end cover passes through the adjusting screw and is fixed on the valve body, and the end of the adjusting screw extending out of the end cover is installed with a hand wheel.

Preferably, an O-ring I seal is used between the end cover and the valve body.

Preferably, an O-ring II is used for sealing between the hexagonal plug and the valve body.

Preferably, the valve core is a poppet valve core structure.

The beneficial effects of the present utility model are:

(1) The structure is simple and there is no fatigue failure, which ensures the normal operation of the pilot valve.

(2) The response is sensitive and the pressure loss of the pilot valve is reduced.

(3) The vibration of the valve core is small, which improves the constant pressure accuracy of the relief valve.

(4) The permanent magnet spring force transmission route is short, and the pilot valve has a compact structure.

Description of drawings

Fig. 1 is the sectional view of the present utility model;

In the picture: 1-hexagonal plug, 2-valve body, 3-spool, 4-adjusting screw, 5-end cover, 6-handwheel, 7-O-ring I, 8-permanent magnet I, 9- Permanent magnet Ⅱ, 10-O-ring Ⅱ.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and specific embodiments.

Embodiment 1: As shown in Figure 1, a permanent magnet spring type relief valve pilot valve is characterized in that: a hexagonal plug 1, a valve body 2, a valve core 3, an adjusting screw 4, an end cover 5, a hand wheel 6. Permanent magnet I8, permanent magnet II9.

The hexagonal plug 1 is inserted into one end of the valve body 2 to prevent the oil from flowing out. The valve core 3 is inserted into the other end of the valve body 2, the end of the valve body 2 connected with the valve core 3 is also installed with an adjusting screw 4, the adjusting screw 4 is not in contact with the valve core 3, and a permanent magnet is arranged between the two, permanent magnet I8 It is connected with the adjusting screw 4, the permanent magnet II 9 is connected with the valve core 3; the end cover 5 passes through the adjusting screw 4 and is fixed on the valve body 2, and the end of the adjusting screw 4 extending out of the end cover 5 is installed with a hand wheel 6 . The permanent magnet I8 and the permanent magnet II9 constitute a permanent magnet spring, which is placed in the valve body 2 using the principle of homopolar repulsion. The repulsive force between the cylindrical permanent magnet I8 and the permanent magnet II9 is the spring force.

The end cover 5 and the valve body 2 are sealed by an O-ring I7.

The hexagonal plug 1 and the valve body 2 are sealed by an O-ring II10.

The valve core 3 is a poppet valve core structure.

The principle of the utility model is: when the oil inlet A does not pass pressure oil, the valve core 3 is in a closed state, and the oil cannot enter the valve body 2 . When the oil inlet A is connected to the pressure oil, as the oil pressure increases, the oil flows in from the A port, overcomes the repulsion between the permanent magnet cylinders set by the handwheel 6 and pushes the valve core 3 open, and flows out from the oil return port C. At this time, the upper chamber flow channel B connected to the valve core 3 causes the valve core 3 to generate a pressure difference, thereby opening the overflow.

The specific embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, the present utility model can also be used without departing from the purpose of the present utility model. Various changes are made under the premise.

Claims (5)

1. The utility model provides a permanent magnetism spring formula overflow valve pilot valve which characterized in that: the valve consists of a hexagonal plug (1), a valve body (2), a valve core (3), an adjusting screw rod (4), an end cover (5), a hand wheel (6), a permanent magnet I (8) and a permanent magnet II (9);

the hexagonal plug (1) is inserted into one end of the valve body (2), the valve core (3) is inserted into the other end of the valve body (2), an adjusting screw (4) is further installed at one end of the valve body (2) connected with the valve core (3), the adjusting screw (4) is not in contact with the valve core (3), a permanent magnet is arranged between the adjusting screw and the valve core, the permanent magnet I (8) is connected with the adjusting screw (4), and the permanent magnet II (9) is connected with the valve core (3); the end cover (5) penetrates through the adjusting screw rod (4) and fixes the adjusting screw rod (4) on the valve body (2), and a hand wheel (6) is installed at one end, extending out of the end cover (5), of the adjusting screw rod (4).

2. The permanent magnet spring type overflow valve pilot valve of claim 1, wherein: the end cover (5) and the valve body (2) are sealed through an O-shaped sealing ring I (7).

3. The permanent magnet spring type relief valve pilot valve of claim 1 or 2, characterized in that: the hexagonal plug (1) and the valve body (2) are sealed through an O-shaped sealing ring II (10).

4. The permanent magnet spring type overflow valve pilot valve of claim 3, wherein: the valve core (3) is of a cone valve core structure.

5. The permanent magnet spring type overflow valve pilot valve of claim 1, wherein: the valve core (3) is of a cone valve core structure.

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