Residual magnetism prevention pilot assembly

Abstract

The utility model discloses a residual magnetism prevention pilot assembly, which relates to the technical field of pilot heads and comprises a pilot head shell, the upper end of the pilot head shell is fixedly connected with a static iron core, the bottom of the pilot head shell is movably connected with a movable iron core in an inserted manner, and the bottom of the movable iron core is provided with a piston mounting groove. A piston mounting groove is formed in the middle of the movable iron core, a valve element sealing piston is movably connected to the bottom of the piston mounting groove in an inserted mode, a piston pre-tightening spring is arranged between the valve element sealing piston and the groove bottom of the piston mounting groove, and a balance notch is formed in one side of the movable iron core. The reset force value is increased, the residual magnetism adsorption force is offset, the reset force is remarkably improved on the premise that the coil power is not changed, the residual magnetism problem of the low-power two-way valve pilot head is effectively solved, and the low-power two-way valve pilot head has the advantages of being compact in structure, low in cost and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to pilot head technical field, concretely relates to a pilot assembly of anti residual magnetism. BACKGROUND

[0002] In the current market, for the stainless steel two-way pilot head with the coil aperture less than the separation bump 10mm, with the gradually reduced requirement for the coil power, the force value of the reset spring must be adjusted accordingly to keep balance. However, this adjustment leads to a problem: after a period of use, residual magnetism phenomenon occurs in the iron core, which directly affects the sensitivity of the action response, thereby causing poor action response.

[0003] In order to solve the problem of residual magnetism of the iron core, a dynamic iron core rolling treatment method is usually used, which makes the contact surface of the iron core uneven to reduce the adsorption force between the iron cores. Although this method can alleviate the problem to some extent, the surface of the iron core may become smooth due to wear after a period of use, so the adsorption force will gradually increase. Therefore, this method does not fundamentally solve the problem of residual magnetism of the iron core. In view of this, we propose a new type of anti residual magnetism pilot assembly. SUMMARY

[0004] The utility model aims at: for solving the problem that the iron core appears residual magnetism phenomenon after a period of use of the pilot head, affecting the sensitivity of the action response, leading to poor action response, the utility model provides a pilot assembly of anti residual magnetism.

[0005] The utility model discloses a kind of pilot assembly of anti residual magnetism, which is characterized by the following technical solutions:

[0006] A kind of pilot assembly of anti residual magnetism, including pilot head shell, the upper end of the pilot head shell is fixedly connected with static iron core, and the bottom of pilot head shell is movably inserted with dynamic iron core, the bottom of the dynamic iron core is equipped with piston installation groove, and the bottom of piston installation groove is movably inserted with valve core sealing piston, piston pre-tightening spring is arranged between the valve core sealing piston and the groove bottom of piston installation groove, the side of the dynamic iron core is equipped with balance gap, the center of the groove bottom of piston installation groove is equipped with reset auxiliary groove, and separation auxiliary spring is inserted in reset auxiliary groove, the lower end of the separation auxiliary spring is in the center with the upper end of valve core sealing piston, and the upper end of the separation auxiliary spring is fixedly connected with auxiliary separation plug, the auxiliary separation plug is movably inserted in dynamic iron core center reset auxiliary groove, and the upper end center of the auxiliary separation plug is fixedly connected with separation bump, the upper end of the separation bump is penetrated dynamic iron core top, and the length of the separation bump is greater than the distance between the groove bottom of dynamic iron core center reset auxiliary groove and the upper end of dynamic iron core.

[0007] Further, the separation bump is made of ABS engineering plastic material, and the upper end of the separation bump is 0.2-0.3 mm higher than the plane of the moving iron core, and the pre-tightening force of the separation auxiliary spring is 1.5-2.5 N.

[0008] Further, the cooperation gap between the separation bump 10 and the center reset auxiliary groove of the moving iron core 3 is ±0.5 mm.

[0009] Further, the upper end of the auxiliary separation plug is fixedly connected with a connecting stud, and the separation bump is threadedly connected to the connecting stud.

[0010] The beneficial effects of the utility model are as follows:

[0011] 1. The mechanical limiting of the separation auxiliary spring and the auxiliary separation plug can increase the reset force value when the electromagnetic coil is powered off, offset the residual magnetic attraction force, significantly improve the reset force under the premise of not changing the coil power, effectively solve the residual magnetic problem of the low-power two-way valve pilot head, and have the characteristics of compact structure, low cost and high reliability.

[0012] 2. The design that the upper end of the separation bump is 0.2-0.3 mm higher than the plane of the moving iron core ensures that the separation bump can accurately and reliably cooperate with the external structure when acting, and realizes stable separation effect. In addition, the pre-tightening force of the separation auxiliary spring is set to 1.5-2.5 N, and this reasonable pre-tightening force range can ensure sufficient reset force and avoid energy consumption increase and component wear caused by excessive pre-tightening force.

[0013] 3. The design that the upper end of the auxiliary separation plug is fixedly connected with a connecting stud and the separation bump is threadedly connected to the connecting stud makes the disassembly and assembly of the separation bump more convenient, and facilitates subsequent maintenance and replacement. At the same time, this connection mode is convenient for adjusting the protruding height of the upper end of the separation bump to adapt to electromagnetic valves with different stroke requirements. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is an internal structure diagram of the utility model;

[0015] Figure 2 is an enlarged view of A in the utility model Figure 1 .

[0016] Mark: 1, pilot head shell; 2, static iron core; 3, moving iron core; 4, piston mounting groove; 5, piston pre-tightening spring; 6, valve core sealing piston; 7, balance gap; 8, separation auxiliary spring; 9, auxiliary separation plug; 10, separation bump. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.

[0018] Please refer to Figure 1 - Figure 2 The utility model provides a kind of anti residual magnetic pilot assembly, including pilot head shell 1, the upper end of the pilot head shell 1 is fixedly connected with static iron core 2, and the bottom of pilot head shell 1 is movably inserted with dynamic iron core 3, the bottom of dynamic iron core 3 is equipped with piston installation slot 4, and the bottom of piston installation slot 4 is movably inserted with valve core sealing piston 6, piston pre-tightening spring 5 is arranged between valve core sealing piston 6 and the groove bottom of piston installation slot 4, one side of dynamic iron core 3 is equipped with balance gap 7, the center of the groove bottom of piston installation slot 4 is equipped with reset auxiliary groove, and separate auxiliary spring 8 is inserted in reset auxiliary groove, the lower end of separate auxiliary spring 8 is in the center with the upper end of valve core sealing piston 6, and separate auxiliary spring 8 is fixedly connected with auxiliary separation plug 9 in the upper end, auxiliary separation plug 9 is movably inserted in the center reset auxiliary groove of dynamic iron core 3, and auxiliary separation plug 9 is fixedly connected with separation lug 10 in the center of the upper end, the upper end of separation lug 10 is penetrated dynamic iron core 3 top, and the length of separation lug 10 is greater than the distance between the groove bottom of dynamic iron core 3 center reset auxiliary groove and dynamic iron core 3 upper end.

[0019] The working principle and use process of the utility model: when the device is used, electromagnetic coil is installed on the outside of pilot head shell 1, electromagnetic coil is electrified to make static iron core 2 generate magnetic force and attract dynamic iron core 3, when power off, dynamic iron core 3 is moved downward under the action of valve core reset spring, and is in contact with valve core guide valve port sealing, by the mechanical limit of the setting separate auxiliary spring 8 and auxiliary separation plug 9, when electromagnetic coil is powered off, reset force value is increased, residual magnetic adsorption force is offset, reset force is significantly improved under the premise of not changing coil power, effectively solve the residual magnetic problem of low-power two-way valve pilot head, with the characteristics of compact structure, low cost and high reliability.

[0020] In the embodiment, preferably, the separation bump 10 is made of ABS engineering plastic material, and the upper end of the separation bump 10 is 0.2-0.3mm higher than the plane of the moving iron core, and the pre-tightening force of the separation auxiliary spring 8 is 1.5-2.5N; the separation bump 10 made of ABS engineering plastic material not only has good wear resistance and corrosion resistance, but also can effectively buffer the impact between the moving iron core 3 and the separation bump 10 due to its slight elasticity, thereby prolonging the service life. Meanwhile, the design that the upper end of the separation bump 10 is 0.2-0.3mm higher than the plane of the moving iron core ensures that the separation bump 10 can accurately and reliably cooperate with the external structure when it is in action, thereby realizing stable separation effect. In addition, the pre-tightening force of the separation auxiliary spring 8 is set to 1.5-2.5N, which is a reasonable pre-tightening force range that can ensure sufficient reset force and avoid increase of energy consumption and component wear due to excessive pre-tightening force.

[0021] In the embodiment, preferably, the cooperation gap between the separation bump 10 and the center reset auxiliary groove of the moving iron core 3 is ±0.1mm; the cooperation gap ensures flexible movement of the separation bump 10 in the center reset auxiliary groove of the moving iron core 3, and meanwhile avoids unstable action or leakage problem due to excessive gap. This design not only ensures stable performance of the pilot assembly, but also improves the service life and reliability of the pilot assembly.

[0022] In the embodiment, preferably, the upper end of the auxiliary separation plug 9 is fixedly connected with a connecting stud, and the separation bump 10 is threadedly connected to the connecting stud; the design that the upper end of the auxiliary separation plug 9 is fixedly connected with the connecting stud and the separation bump 10 is threadedly connected to the connecting stud makes the separation bump 10 more convenient to disassemble and assemble, thereby facilitating subsequent maintenance and replacement. Meanwhile, this connection mode facilitates adjustment of the protruding height of the upper end of the separation bump 10, so as to adapt to electromagnetic valves with different stroke requirements.

[0023] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pilot assembly for preventing residual magnetism, comprising a pilot head housing (1), wherein a stationary iron core (2) is fixedly connected to the upper end of the pilot head housing (1), and a movable iron core (3) is movably inserted into the bottom of the pilot head housing (1), wherein a piston mounting groove (4) is provided at the bottom of the movable iron core (3), and a valve core sealing piston (6) is movably inserted into the bottom of the piston mounting groove (4), wherein a piston preload spring (5) is provided between the valve core sealing piston (6) and the bottom of the piston mounting groove (4), and a balance notch (7) is provided on one side of the movable iron core (3), characterized in that: The bottom center of the piston installation groove (4) is provided with a reset auxiliary groove, and a separation auxiliary spring (8) is inserted in the reset auxiliary groove, the lower end of the separation auxiliary spring (8) abuts against the upper end center of the valve core sealing piston (6), and the upper end of the separation auxiliary spring (8) is fixedly connected with an auxiliary separation plug (9), the auxiliary separation plug (9) is movably inserted in the center reset auxiliary groove of the moving iron core (3), and the upper end center of the auxiliary separation plug (9) is fixedly connected with a separation protruding block (10), the upper end of the separation protruding block (10) penetrates the top of the moving iron core (3), and the length of the separation protruding block (10) is greater than the distance between the bottom of the center reset auxiliary groove of the moving iron core (3) and the upper end of the moving iron core (3).

2. A pilot assembly according to claim 1, wherein: The separation protruding block (10) is made of ABS engineering plastic, and the upper end height of the separation protruding block (10) exceeds the plane of the moving iron core by 0.2-0.3 mm, and the pre-tightening force value of the separation auxiliary spring (8) is 1.5-2.5 N.

3. A pilot assembly according to claim 1, wherein: The cooperation gap between the separation protruding block (10) and the center reset auxiliary groove of the moving iron core (3) is ±0.5 mm.

4. A pilot assembly according to claim 1, wherein: The upper end of the auxiliary separation plug (9) is fixedly connected with a connecting stud, and the separation protruding block (10) is threadedly connected on the connecting stud.

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