RU2655072C1 - Electrically controlled cartridge cutoff valve - Google Patents

Abstract

FIELD: transportation; machine building.

SUBSTANCE: valve is intended for control of working executive bodies of movable vehicles. Spool (5) is installed in sleeve (4), screwed into body (1), where anchor (2) is installed, resiliently pressed (9) to spool (5). In spool (5) is installed ball (8), closed with bush (6). Valve has a pilot electrical control by the means of a high-hardness gate, pressed into the anchor, made in the spool of micro throttle and a non-return valve. Valve has a compact size due to the placement of the non-return valve in the form of a ball inside the spool.

EFFECT: technical result consists in reducing the mass-dimensional characteristics, increasing the working life of the product, improving the flow characteristics, as well as the possibility of remote control of hydraulics at high pressure.

1 cl, 2 dwg

Description

The invention relates to elements of hydraulic circuits with moving parts and can be used as a control element of the working executive bodies of mobile vehicles.

The valve consists of a sleeve, spool, ball, spring, electromagnet and electric coil. The product has a cartridge design and is mounted in the housing of the hydraulic system, connecting the cavity with the feed and drain line, respectively.

The technical result consists in reducing the weight and size characteristics, increasing the product life, improving the flow characteristics, as well as the possibility of remote control of hydraulic equipment at high pressure.

A known electromagnetic valve comprising a housing with inlet and outlet nozzles, a cylinder, a piston with a sealing element, an electromagnet, an anchor with a sealing element, a spring. The piston and anchor are mechanically interconnected by a grip. Inside the piston, a feed channel is made connecting the inlet pipe and the over-piston cavity and the drain channel. At the same time, a shut-off valve is installed inside the feed channel, which is controlled by a pusher with an anchor of an electromagnet (RU 2592708 C1, 02.27.2015).

The known device has the following disadvantages:

- has a flange mount, and therefore has a sufficiently large size,

- has a sealing element of the piston, which reduces the life of the tightness of the product.

Also known is a cartridge valve with electric control, the body of which is made non-separable (solid) from non-magnetic material. A threaded connection connects the pole of the electromagnet to the valve body. The integral bolt and anchor are of sufficient length, which minimizes its inclination. The one-piece housing allows you to make one guide hole for the plunger and the armature with a bolt (US 5205531 A, 04/27/1993).

The known device has the following disadvantages:

- the housing is made non-separable, which increases the complexity of its manufacture and reduces maintainability,

- has a solid anchor with a pusher, which is made of a magnetically conductive material, which reduces the life of the pusher.

The closest analogue prototype to the claimed technical solution in terms of the set of features and the achieved effect is a cartridge valve with electromagnetic control using a unified electromagnet for various valve sizes, containing a sleeve, spool, a bolt mounted in an anchor, a housing, springs and a coil (US 4540154 A 09/10/1985) (prototype).

The known device has the following disadvantages:

- in the direction of fluid movement in the axial direction (from P1 to P2 according to Fig. 1), the spool may not open completely, since the working fluid, passing through the center hole in the spool, under certain conditions can overpower the spring and only open the shutter holding the spool . In this case, the passage of the maximum flow rate will not be provided in this direction,

- the free position of the shutter relative to the armature of the electromagnet can lead to jamming of the armature.

The technical objectives of the invention are:

- reduction of overall dimensions,

- the ability to remotely control hydraulic equipment,

- performance at high pressures,

- full opening of the spool when working in both directions,

- reducing the complexity of manufacturing the product,

- increased service life and reliability of the product.

This is achieved by the fact that, in contrast to the known technological solutions, a pilot control cascade with electric control is used in the design, in which a high hardness gate is rigidly pressed into the anchor. To ensure full opening of the spool during operation of the valve from cavity P1 to P2 (see Fig. 1), a ball is installed in the spool hole to prevent only one shutter from moving under the influence of the pressure drop, as a result of which the maximum flow rate of the working fluid in this direction is ensured. By supplying a control signal, the shutter opens the throttle opening, as a result of which a force is removed from the valve spool, which compresses it to the working edge of the sleeves. Under the influence of a differential pressure, the spool opens, passing through the flow of working fluid. The use of a pilot shutter with electric control allows you to apply the invention in hydraulic systems where high tightness is required and there is a requirement for operation at high pressures (over 300 kgf / cm ² ).

The essence of the invention is illustrated in the drawing (see Fig. 1), which shows a diagram of a shut-off cartridge valve with electric control. In FIG. 2 shows a diagram of a hydraulic valve.

Electronically controlled cartridge shut-off valve contains:

- housing (1), consisting of four elements welded together,

- anchor (2) with a bolt pressed into it,

- an electric coil (3),

- sleeve (4),

- spool (5),

- sleeve (6),

- nut (7),

- ball (8),

- spring (9).

The device operates as follows. In the initial state, the anchor 2 by means of the shutter and due to the action of the spring 9 presses the spool 5 to the edge K of the sleeve. In this case, when the working fluid is supplied under pressure into the P1 cavity, the spool 5 under the action of a pressure differential exceeding the stiffness of the spring 9 squeezes it and moves, allowing the fluid to flow from the P1 cavity into the P2 cavity. When the working fluid is supplied under pressure into the cavity P2, a pressure drop occurs, which, on the contrary, presses the spool 5 more strongly to the edges of the sleeve 4, blocking the outflow of fluid from the cavity P2 to P2. The difference is due to the hole D, through which the liquid from the cavity P2 enters the P3.

When an electrical signal is supplied to the coil winding 3, an electric field arises that attracts the armature 2 to the pole, thereby compressing the spring 9 and releasing the spool 5. When pressure is applied to the cavity P1, the ball 8, acting as a shutter, closes the channel connecting the cavities P1 and P3 . In the cavity P1, a differential is created that moves the spool 5 and due to which the cavities P1 and P2 are connected.

When pressure is applied to the P2 cavity, the liquid immediately creates a differential in this cavity and moves the spool to the extreme right position, connecting the P2 and P1 cavities. The difference is created due to the small diameter of the hole D (throttle) in the spool connecting the cavities P2 and P3 - the fluid does not have time to get from the cavity P2 to P3.

All of the above indicators are confirmed by making prototypes and conducting experiments.

Claims (1)

Cartridge shut-off valve with electric control, consisting of a sleeve, a spool, preloaded by an anchor and a spring, a ball, a sleeve, a body, consisting of four parts welded together, and a coil having a pilot control, characterized in that it has a check valve built into the spool in the form ball and shutter, rigidly pressed into the anchor, pressing the spool with a flat end without undercutting.

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