SU1207609A1 - Combustion chamber for pulsed machine for pressure machining of metal - Google Patents

Description

The invention relates to mechanical engineering, namely to the design of forging and stamping equipment.

The purpose of the invention is to increase durability by reducing heating of the shut-off valve.

Figure 1 shows the combustion chamber in the initial position; na figure 2 is the same in the process of working stroke.

The combustion chamber contains a housing 1 in which a shut-off valve 2 is mounted with the possibility of overlapping the overflow channel 3 connecting the expansion cylinder 4 to the working cavity 5 located concentrically to the valve 2. The working cavity 5 is connected to channel 6 with an additional cavity 7, located to the side of cavity 5j, the volume of the latter is 5-10% of the volume of cavity 7,

The inlet valve 8 and the inlet valve 9 with a spark plug 10 are placed in the walls of the housing on the side of the cavities 5 and 7, respectively.

The combustion chamber works as follows.

In the initial position, the locking valve 2 closes the bypass channel 3 and thereby seals the combustion chamber. Then the inlet valve 9 is opened and a combustible gas is fed into the cavities 7 and 5. As soon as the pressure value of the gas reaches a predetermined value, its supply is stopped, and compressed air begins to flow through the inlet valve 8. At the same time, the combustible gas from cavity 5 is forced out by air through Channel 6 to cavity 7 of the combustion chamber. Due to this, practically only air remains in cavity 5, and fuel mixture is formed in cavity 7 with an excess air ratio of 1.

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When the preset pressure value of the fuel mixture is reached, the compressed air supply is stopped and the mixture is ignited by the candle 10. In section 5, the fuel mixture burns with pressure, and in cavity 5 there is no burning as there is no combustible gas. Thus, in cavity 5, the temperature increases only due to adiabatic compression of air in it from the pressure of the fuel mixture to the pressure of the combustion products. When the preset value of pressure 15 of the combustion products is reached, the locking valve 2 automatically rises up and opens the bypass channel 3 "

20 As soon as the overflow section of channel 3 begins to open, compressed air from cavity 5 enters this channel and further into cylinder 4. Thus, at this time, the sealing surfaces of the closing valve 2 are washed with relatively cold compressed air.

In the process of further opening the locking valve 2 (Fig. 2), it

3Q completely opens the flow area of the channel 3 and leaves the stream of high-temperature gases, which begin to flow from the cavity 7 of the combustion chamber through the channel 6 into the cavity 5.

After the combustion products have flowed into the expansion cylinder 4, the pressure in cavities 5 and 7 will fall and the locking valve 2 will fall down, shutting off the overflow channel 3. The chamber is ready for a new dial gauge.

The economic effect of implementing the invention is provided by increasing the durability of the combustion chamber.

6 Phi2.2

Editor A.Gulko

Compiled by I. Bazunov Tehred A. Kabinets

Order 121/11 Circulation 656 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GOSH Patent, Uzhgorod, st. Project, 4

Proofreader A.Zimokosov

Claims (1)

COMBUSTION CAMERA OF A PULSE MACHINE FOR PROCESSING METALS LENIUM comprising a seat located in the housing, a locking valve mounted to interact with the seat, a central cavity located concentrically last, an air inlet valve, as well as a fuel inlet valve and a spark plug, so that that, in order to increase durability, an additional cavity and a channel connecting both cavities are made in the housing on the side of the central cavity, the fuel inlet valve and the spark plug being mounted in the additional cavity of the combustion chamber. 1 7 J SU <„, 1207609