SU312968A1 - TWO-MODE VALVE DEVICE - Google Patents

Description

The invention relates to the field of engineering, mainly to the field of agricultural engineering, and is aimed at improving the dual-mode valve devices of hydraulic systems, in particular the hydraulic control system of a combine harvester.

A dual-mode valve device that includes a common body with two autonomous control valves mounted in it and successively located with valves is widely known.

The known device has significant dimensions, since each valve contains all the elements, as well as separate underwater and diversion channels.

The purpose of the invention is to simplify the design and reduce the size of the dual-mode valve device.

The housing of the proposed device is made with underwater and diversion channels common to both valves, and the low pressure valve is in the form of a hollow cup located in the housing with the formation of a closed closed valve cavity permanently connected to the outlet channel, and is provided with a locking device that turns off the indicated valve from operation, wherein the cavity of said shutter is connected by an axial channel through a high-pressure valve with a subsea channel,

and radial or radial channels - with a closed cavity. The locking device for shutting off the low pressure valve from work is made in the form of a hollow threaded sleeve mounted in the device case coaxially with the device for adjusting the valve spring.

In order to eliminate the imbalance of the high pressure valve when it is turned off

operation of the low pressure valve; the locking device of the low pressure valve and the device for regulating the valve spring are made in the form of a screw pair of one step.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 is the same in the high pressure mode when the low pressure valve is turned off; in fig. 3 - the same in the low pressure mode.

A dual-mode valve device (FIG. 1) includes a housing /, in the cavity of which two valves 2 and, respectively, low and high are mounted on one common axis

pressure. The high pressure valve is formed by a seat 6, made in the form of a hole in the bottom of the low pressure valve and a ball shutter 7, blocking the specified hole. The housing cavity in the lower part is somewhat larger in diameter, forming a closed valve cavity of the low pressure. The said cavity is connected by a diversion channel 8 to the hydraulic system (not shown in the drawing) and one 9 or a number of channels in the gate to the internal cavity of the said gate. A threaded bushing 10 is mounted on the side opposite to the saddle in the housing. This bushing is mounted with the possibility of axial movement until it stops by closing the saddle. Inside this sleeve, a screw 11 is mounted on the thread with a stop 12. Between the stop 12 and the stop 13 adjacent to the ball 7, a spring 14 is installed, holding both valves in the closed position. The screw and the threaded sleeve have a reserve of threads for possible adjustment of the spring, for which the screw shank 15 is made with a turn-key section. The sleeve also has a shank with a cross section of a wrench for the convenience of its axial movement. The screw thread, as well as the two 30 threads of the sleeve, are made in one step so that, when the sleeve is axially moved, this does not affect the position of the screw. To fix the adjusted force 35 of the squad there is a L-shaped bracket, one shelf of which has an opening in the shape of the screw shank, and the other is attached to the body with a bolt. When the device operates in the high pressure mode (Fig. 2), the bolt is pressed against the seat by a threaded sleeve, which is axially moved axially along the device axis with a key. As a result, the flow of working fluid through the underwater 45 channel 18, made in the saddle, the axial channel 19, made in the gate, overcoming the spring force, opens the ball of the high pressure valve and through the radial holes in the gate, the closed cavity of the low 50 5 pressure, the bypass channel flows to drain (not shown). When the device operates in the low pressure mode (Fig. 3), the threaded bushing moves upwards, allowing the low pressure valve to freely slide, along its axis. After that, the working fluid, acting on a larger area of the valve than in the high pressure mode, where the area affected by the axial channel section, moves the valve upward and flows from the underwater channel, through the closed cavity of the low pressure valve, to the outlet channel. The subject matter of the invention 1. A dual-mode valve device comprising a common body with two spring-loaded high and low pressure valves mounted on one common axis, containing a saddle and a shutter, characterized in that, in order to simplify the construction and reduce its dimensions, the device’s corr common to both valves underwater and branch ducts, and the low pressure valve shutter - in the form of a hollow glass located in the housing with the formation of a closed riveted cavity, permanently connected to the outlet m channel, and is equipped with a shut-off device that turns off the valve from work, with the valve cavity connected by an axial channel through a high-pressure valve to the underwater channel, and radial or radial channels to a closed cavity, 2. The device according to claim 1, characterized in that the locking device for shutting off the low pressure valve from work is made in the form of a hollow threaded sleeve mounted in the housing of the device coaxially with the device for adjusting the valve spring, 3. The device according to claims. 1 and 2, characterized in that, in order to avoid the imbalance of the high pressure valve when the low pressure valve is shut down, the low pressure valve locking device and the device for adjusting the valve spring are made in the form of a screw pair of one step.