UA25329U - Device for testing low-power external combustion engines - Google Patents

Abstract

The proposed device for testing low-power external combustion engines contains a pump, a vacuum manometer, a pressure transducer, and a direct-recording unit. The working chamber of the pressure transducer is coupled with the cavity of the cylinder of the engine. In the chamber, an elastic diaphragm with a movable contact is installed. The pump and the vacuum manometer are coupled with the working chamber of the pressure transducer. The direct-recording unit contains a drum, which is coupled with the flywheel of the engine, and a pen, which is coupled with the pointer of the vacuum manometer.

Description

Description of the invention

A useful model belongs to the field of diagnostics and can be used to indicate low-power engines with external heat supply (DZPT).

A well-known device for indicating heat engines, consisting of two chambers connected to each other, with manometers installed in them, one of the chambers is connected to a gas reducer connected to a cylinder of compressed air, and the second by means of a pipeline with a tip to the nozzle hole , a tap is installed between the chambers, for example, a needle tap, with an opening of variable cross-section, an arrow is fixed on the tap spindle, and 70 on the body - a scale with the possibility of registering the amount of opening (Patent of Ukraine 64140 01 1 23/08, Bull. Mo.

The disadvantage of the device is its low sensitivity, which cannot provide the indication of DST with the necessary accuracy at pressures typical for low-power DST.

The closest to the proposed one is a device for indicating low-power DZPT, which contains a device for marking the dead position of the piston, a pneumatic system, a power supply unit, an unbreakable limb, with a scale in degrees, located in the same plane as the flywheel of the DZPT, which has a through groove for observing the illumination of LEDs mounted on the indicating line, the pneumatic system has a pump, a manovacuum meter, connected to the setting cavity of the pneumoelectric sensor, which is connected to the indicated cavity by its working cavity, DZPT and has an elastic membrane equipped with a moving contact of the LED circuit (Ukrainian patent 30817 01 And 23/00, 2000, Bull. Mo7|.

The disadvantage of the device is the need to visually register the angle of rotation of the DZPT crankshaft for each of the control pressure values, which increases the complexity and time of the test and introduces subjective errors.

The basis of the useful model is the development of a device for indicating low-power DZPT, which provides the opportunity to indicate both low pressure and vacuum on an automatic recorder without the tester's intervention in the registration process.

To achieve the specified goal, a device for indicating low-power DZRT is proposed, which consists of a pump and a manovacuum meter, connected to the setting cavity of the pneumoelectric sensor, which is connected to the indicated cavity of the DZRT through its working cavity and has an elastic membrane equipped with a moving contact and the power supply unit, in which, according to the useful model, the recorder drum is connected to the DZPT flywheel, a direct current electromagnet is installed on the needle of the manovacuum meter, which moves along the axis of the recorder drum, on the core of which there is a recorder pen. The core Ha of the electromagnet, which together with the pen is pressed against the drum of the recorder with the help of a spring, is retracted when the current passes through the winding of the electromagnet, which is connected to the moving contact of the pneumoelectric sensor. at

The use of an electromagnet, on the core of which there is a recorder pen, the drum of which is connected to the DZPT flywheel, will allow to mark the angle of rotation of the DZPT crankshaft for each of the values of the control

From pressure. with

Connecting an electromagnet with a recorder pen to the needle of the manovacuum meter allows you to automatically register the pressure value for each of the values of the rotation angle of the DZPT crankshaft with a smooth change in pressure with the help of a pump and thus reduce the complexity, test time and subjective errors. "

The technical essence and principle of operation of the proposed device is explained by the drawing, where in Fig. A block diagram of a device for indicating a low-power DZRT is shown. c The device for indicating low-power DZPT consists of a pneumoelectric sensor 1, a pump 2, a manovacuum meter Z, an electromagnet 4, on the core of which there is a recorder pen 10, a recorder drum 5 and a power supply unit 6. The recorder drum 5 is connected to the flywheel of the DZPT. The working cavity 11 of the pneumoelectric sensor is connected to the indicated cavity / DZPT, and its reference cavity 12 is connected to the pump 2 and the manovacuum meter 3. The pneumoelectric sensor has an elastic membrane 8, equipped with a movable contact and two fixed contacts 9, which are connected to one of the contacts of the power supply unit 6. An electromagnet 4 is connected to another contact of the power supply unit, which is also connected to a movable contact on an elastic membrane 8. The body of the electromagnet 4 is located on the needle of the manovacuummeter 3, and its core is the pen of the recorder 10, which touches the surface of the recorder drum 5. ka 20 The device works as follows.

The pneumoelectric sensor 1 is connected to the indicating cavity 7 DZPT, on the flywheel of the DZPT c is fixed the recorder drum 5, with paper filled in, which is marked in units of pressure and in units of the rotation angle of the crankshaft DZPT. The scribe pen 10 is refilled with ink. Pump 2 sets the limit value of pressure. 29 DZPT starts and switches to the required mode. Then pump 2 pressure changes smoothly in the entire s range for this DZPT mode. After that, the DZPT stops, and the paper with the pressure graph is removed from the recorder drum 5.

The proposed design of the device for indicating low-power engines with external heat supply allows to significantly simplify and speed up the test by automating the process of registering the results of the 60 test.

Claims (1)

Formula of the invention b5 Device for indicating low-power engines with an external heat supply, containing a power supply unit, a pneumatic system that has a pump, a manovacuum meter, connected to the satisfying cavity of the pneumoelectric sensor, which is connected by its working cavity to the cavity of the engine, which is indicated, and has an elastic membrane equipped with a movable contact, which differs in that with the flywheel of the engine with connected recorder drum, the pen of which is installed on the electromagnet core, which is made with the possibility of movement along the axis of the drum, and the electromagnet body is installed on the needle of the manovacuum meter. 70 » o Ge) s so Io) se - a ko 1 (95) ko (Che) 60 65