CN218236169U

CN218236169U - Normally closed valve structure with higher spring assembly precision

Info

Publication number: CN218236169U
Application number: CN202221994174.0U
Authority: CN
Inventors: 郑利水; 杨春成; 邱宝象; 宋敬涛; 刘菁晗; 朱知尉
Original assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Current assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2023-01-06
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses a normally closed valve structure with higher spring assembly precision, which relates to the field of hydraulic control and comprises a fixed iron and the like, wherein the fixed iron is pressed into the upper opening of a magnetism isolating pipe, a moving iron is arranged in the magnetism isolating pipe below the fixed iron, and a spring hole is arranged along the axis of the moving iron in a penetrating way; the upper end of the return spring is propped against the fixed iron, and the lower end of the return spring is placed into the spring hole and is propped against the return spring limiting block; the upper end of the return spring limiting block is pressed into the spring hole, the lower end of the return spring limiting block is embedded with a steel ball, and the steel ball and the conical surface of the oil outlet are always sealed; the oil outlet is arranged at the bottom of the valve seat, the valve seat is pressed at the lower opening of the magnetism isolating pipe, the valve seat is sleeved at the lower end of the moving iron, and the side wall of the valve seat is provided with an oil inlet. The utility model solves the problem of lower control precision of the prepressing height of the reset spring through structure adjustment; the design requirement of spring force change is realized in a more economical and practical mode; the single component with higher processing cost is replaced by the sub-component which is easy to process.

Description

Normally closed valve structure with higher spring assembly precision

Technical Field

The utility model relates to a hydraulic control field, concretely relates to normally closed valve structure that spring assembly precision is higher.

Background

The normally-closed valve widely applied to the hydraulic system has the function of adjusting the pressure difference of the oil inlet and the oil outlet, and the structure of the normally-closed valve in the common system on the market at present has a set of mature and economic universal structure. Because the product has higher requirement on the response speed of the normally-closed valve opening and closing action, the moving iron stroke closely related to the normally-closed valve opening and closing action is a parameter which needs to be controlled heavily in the production process. In the normally-closed valve structure shown in fig. 1, the press-fitting of the fixed iron (1 ') is divided into two steps of pre-pressing and fine-pressing, and the stroke of the moving iron is monitored in real time in the press-fitting process, so that the stroke precision of the moving iron (3') controlled by a process can reach +/-0.02 mm. In the normally-closed valve structure shown in fig. 1, the pre-pressing height of the return spring (2') is determined by the moving iron spring hole depth (the precision is ± 0.1 mm) and the moving iron stroke, and in the ABS and ESC systems which are currently applied more, the spring pre-pressing height obtained by superimposing the above two dimensional tolerances has no obvious influence on the user experience and the core performance of the product.

Because the unavoidable size deviation exists in the moving iron spring hole machining process, the normally-closed valve structure cannot meet the design requirement of higher spring control precision. In addition, although the moving iron structure adopted in the normally-closed valve structure is simple enough and easy to process, when the design requirements of different spring forces of products of the same series and different models are matched, a new moving iron needs to be designed according to each different model, so that the processing cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, and provides a normally closed valve structure with higher spring assembly precision, thereby improving the dimensional accuracy of the installation space of the normally closed valve reset spring; different resilience force design requirements are met by replacing the reset spring limiting block; the structure is simplified, and the processing cost is reduced.

The purpose of the utility model is accomplished through following technical scheme: the normally-closed valve structure with the spring assembly higher in precision comprises a fixed iron, a magnetism isolating pipe, a return spring, a movable iron, a return spring limiting block, a valve seat, a steel ball, an oil outlet and an oil inlet, wherein the fixed iron is pressed into an upper opening of the magnetism isolating pipe, the movable iron is arranged in the magnetism isolating pipe below the fixed iron, and a spring hole is formed in the magnetism isolating pipe in a penetrating mode along the axis of the movable iron; the upper end of the reset spring is propped against the fixed iron, the lower end of the reset spring is placed into the spring hole and is propped against the reset spring limiting block, and the reset spring applies downward resilience force to the reset spring limiting block; the upper end of the return spring limiting block is pressed into the spring hole, the lower end of the return spring limiting block is embedded with a steel ball, and the steel ball and the conical surface of the oil outlet are always sealed; the oil outlet is arranged at the bottom of the valve seat and used for discharging brake fluid, the valve seat is pressed at the lower opening of the magnetism isolating pipe, the valve seat is sleeved at the lower end of the moving iron, an oil inlet is formed in the side wall of the valve seat, and a ring filter screen is arranged at the oil inlet.

As a further technical scheme, the fixed iron and the inner wall of the magnetism isolating pipe are in interference fit, and the fixed iron and the magnetism isolating pipe are sealed through laser welding.

As a further technical scheme, reset spring stopper and spring hole interference fit adjust reset spring's pre-compaction height through the degree of depth that control reset spring stopper impressed spring hole.

As a further technical scheme, the valve seat is in interference fit with the magnetism isolating pipe, and the valve seat limits the pressing-in depth by means of proper pressing-in force of transition step fit at the lower part of the magnetism isolating pipe.

As a further technical scheme, the ring filter screen is in interference fit with the valve seat, and the end face of the ring filter screen is flush with the lower end face of the magnetism isolating pipe.

The beneficial effects of the utility model are that:

1. the problem of low control precision of the prepressing height of the return spring is solved through structure adjustment;

2. the design requirement of spring force change is realized in a more economical and practical mode;

3. the single component with higher processing cost is replaced by the sub-component which is easy to process.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

Description of reference numerals: the device comprises a fixed iron 1', a return spring 2', a moving iron 3', a magnetism isolating pipe 4', a valve seat 5', a ring filter screen 6' and a steel ball 7'; the device comprises a fixed iron 1, a magnetism isolating pipe 2, a transition step 2-1, a return spring 3, a moving iron 4, a spring hole 4-1, a return spring limiting block 5, a valve seat 6, a ring filter screen 7, a steel ball 8, an oil outlet 9 and an oil inlet 10.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

the embodiment is as follows: as shown in the attached drawing 2, the normally-closed valve structure with the higher spring assembly precision comprises a fixed iron 1, a magnetism isolating pipe 2, a return spring 3, a moving iron 4, a return spring limiting block 5, a valve seat 6, a ring filter screen 7, a steel ball 8, an oil outlet 9 and an oil inlet 10, wherein the upper opening of the magnetism isolating pipe 2 is pressed into the fixed iron 1, the moving iron 4 is arranged in the magnetism isolating pipe 2 below the fixed iron 1, and the moving iron 4 axially moves relative to the inner wall of the magnetism isolating pipe 2; a spring hole 4-1 is arranged along the axis of the moving iron 4 in a penetrating way; the upper end of the reset spring 3 is abutted against the fixed iron 1, the lower end of the reset spring 3 is placed into the spring hole 4-1 and abutted against the reset spring limiting block 5, and the reset spring 3 applies an axially downward resilience force to the reset spring limiting block 5; the upper end of the return spring limiting block 5 is pressed into the spring hole 4-1, the lower end of the return spring limiting block 5 is embedded with a mounting steel ball 8, and the steel ball 8 and the conical surface of the oil outlet 9 are always sealed; the oil outlet 9 is formed in the bottom of the valve seat 6 and used for discharging brake fluid, the valve seat 6 is pressed on the lower opening of the magnetism isolating pipe 2, the valve seat 6 is sleeved at the lower end of the moving iron 4, an oil inlet 10 is formed in the side wall of the valve seat 6, and an annular filter screen 7 is arranged at the position of the oil inlet 10. The reset spring limiting block 5 is in interference fit with the spring hole 4-1, and the prepressing height of the reset spring 3 is adjusted by controlling the depth of pressing the reset spring limiting block 5 into the spring hole 4-1.

Preferably, the fixed iron 1 and the inner wall of the magnetism isolating pipe 2 are in interference fit, and the fixed iron and the magnetism isolating pipe are sealed through laser welding. The valve seat 6 is in interference fit with the magnetism isolating pipe 2, and the valve seat 6 limits the pressing-in depth by the transition step 2-1 at the lower part of the magnetism isolating pipe 2. The ring filter screen 7 is in interference fit with the valve seat 6, and the end face of the ring filter screen 7 is flush with the lower end face of the magnetism isolating pipe 4.

The utility model discloses a pressure equipment process: the valve seat 6 is in interference fit with the magnetism isolating pipe 2, and the pressing-in depth is restrained by the fit of a transition step 2-1 of the magnetism isolating pipe 2 with a proper pressing-in force. The steel ball 8 is installed in the recess of 5 bottoms of reset spring stopper, realizes the riveting assembly through the counter force that 5 recess both ends of reset spring stopper were applyed. The reset spring limiting block 5 is in interference fit with the spring hole 4-1 of the moving iron 4, and the depth tolerance of the spring hole 4-1 in the assembly body of the reset spring limiting block 5 and the moving iron is limited by controlling the press-in depth of the reset spring limiting block, so that the prepressing height of the reset spring 3 is adjusted. The utility model discloses for pure machining's single spare part, move indisputable 4, the degree of depth 4-1 of spring hole of the two assembly body of reset spring stopper 5 has great promotion in the precision. An assembly body of the moving iron 4 and the return spring limiting block 5 riveted with the steel ball 8 is directly arranged in an assembly body formed by the magnetism isolating pipe 2 and the valve seat 6, and the contact sealing between the steel ball 8 and the conical surface of the valve seat 6 can be ensured by applying axial downward pressure on the moving iron 4 through the return spring 3 and hydraulic pressure. On the basis of the assembly body, the fixed iron 1 is pressed into the magnetism isolating pipe 2 with a certain magnitude of interference according to the steps of pre-pressing and fine pressing, and laser welding is carried out after the stroke of the moving iron 4 required by design is ensured. Finally, the ring filter screen 7 is pressed into the valve seat 6 with a certain interference, and the end part of the ring filter screen 7 is flush with the end surface of the magnetism isolating pipe 4.

The utility model provides a brand-new structure can realize the great promotion of normally closed valve reset spring pretension height on the accuracy, can satisfy the higher design demand of normally closed valve spring force required precision. The structure reduces the processing cost brought by product switching through the replacement of the sub-components, and provides a more economic option for the switching of different types of products in the same series. The precision of the prepressing height of the return spring is determined by the precision of the stroke of the moving iron and the depth of the spring hole, and the size precision of the return spring and the size precision of the moving iron are controlled to be the same through the adjustment of the structure. Because reset spring is the key parameter of controlling of spring product at the resilience force of pre-compaction height, consequently higher pre-compaction height control accuracy can promote the pretightning force degree of accuracy of this normally closed valve structure. Compared with a single moving iron part in a conventional normally-closed valve structure, the return spring limiting block and the moving iron have higher degree of freedom when being adapted to different types of products. For the change of the design requirement of only the pretightening force of the spring, the replacement of the return spring limiting block has more cost advantage compared with the replacement of a single moving iron part. The utility model discloses in play the reset spring stopper that replaces single moving iron part function and move the iron and adopted the structure of easily processing, move iron part for the single of the independent mould of demand, the processing step is more simple and convenient, the cost is more economical.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims

1. The utility model provides a higher normally closed valve structure of spring assembly precision which characterized in that: the oil-gas separation device comprises a fixed iron (1), a magnetism isolating pipe (2), a reset spring (3), a movable iron (4), a reset spring limiting block (5), a valve seat (6), a ring filter screen (7), a steel ball (8), an oil outlet (9) and an oil inlet (10), wherein the upper opening of the magnetism isolating pipe (2) is pressed into the fixed iron (1), the movable iron (4) is arranged in the magnetism isolating pipe (2) below the fixed iron (1), and a spring hole (4-1) is formed in the magnetism isolating pipe (2) in a penetrating mode along the axis of the movable iron (4); the upper end of the reset spring (3) is supported on the fixed iron (1), the lower end of the reset spring (3) is placed into the spring hole (4-1) and supported on the reset spring limiting block (5), and the reset spring (3) exerts an axially downward resilience force on the reset spring limiting block (5); the upper end of the return spring limiting block (5) is pressed into the spring hole (4-1), the lower end of the return spring limiting block (5) is embedded with a steel ball (8), and the steel ball (8) and the conical surface of the oil outlet (9) are normally sealed; the brake fluid discharging valve is characterized in that the oil outlet (9) is formed in the bottom of the valve seat (6) and used for discharging brake fluid, the valve seat (6) is pressed at the lower opening of the magnetism isolating pipe (2), the valve seat (6) is sleeved at the lower end of the moving iron (4), an oil inlet (10) is formed in the side wall of the valve seat (6), and a ring filter screen (7) is arranged at the position of the oil inlet (10).

2. A normally-closed valve structure with higher assembly accuracy of a spring according to claim 1, wherein: decide indisputable (1) and magnetism isolating pipe (2) inner wall interference fit, and the two seals through laser welding.

3. A normally-closed valve structure with higher spring assembling accuracy according to claim 1, wherein: the reset spring limiting block (5) is in interference fit with the spring hole (4-1), and the prepressing height of the reset spring (3) is adjusted by controlling the depth of the reset spring limiting block (5) pressed into the spring hole (4-1).

4. A normally-closed valve structure with higher assembly accuracy of a spring according to claim 1, wherein: the valve seat (6) is in interference fit with the magnetism isolating pipe (2), and the valve seat (6) limits the pressing-in depth by means of a transition step (2-1) at the lower part of the magnetism isolating pipe (2).

5. A normally-closed valve structure with higher spring assembling accuracy according to claim 1, wherein: the ring filter screen (7) is in interference fit with the valve seat (6), and the end face of the ring filter screen (7) is flush with the lower end face of the magnetism isolating pipe (2).