RU2030601C1 - Device for supplying secondary air - Google Patents

Abstract

FIELD: engine engineering. SUBSTANCE: device additionally has outlet passage, rod arranged inside the housing, and multistep gate mounted on the rod for permitting reciprocation. Damping space is arranged in the housing of a check valve and restricted by a cover and the multistep gate. Air ports provided in side walls of the housing can be connected with the passage for supplying secondary air. The passage is in communication with the exhaust manifold trough outlet passage made up as an ejector nozzle. EFFECT: improved design. 2 dwg

Description

 The invention relates to mechanical engineering, namely to engine building and can be used to reduce exhaust gas toxicity.

 Known exhaust system of an internal combustion engine (ICE), containing check valves (pulsars) installed on the exhaust manifold of the engine.

 The disadvantage of this system is the complexity of the design, as well as its low durability.

 The closest technical solution to the proposed device, selected as a prototype, is a secondary air supply device containing an air purifier connected to the exhaust manifold of the engine using a secondary air supply line equipped with a silencing element and at least one non-return valve, while the silencing element made in the form of a common receiver, and the check valve is located on the latter.

 The disadvantage of this device is that it does not have a sufficiently high degree of operating efficiency, since it does not supply an adequate amount of secondary air to the exhaust system of the internal combustion engine for efficient afterburning of toxic exhaust gas components, and also does not have high durability.

 The aim of the invention is to increase the efficiency of the device.

 This goal is achieved in that the device for supplying secondary air, comprising at least one non-return valve installed in the housing, with a cover and side walls, a damping cavity, air windows and a secondary air supply channel in communication with the exhaust manifold of the engine, unlike the prototype contains an exhaust channel, a rod located in the housing and a multi-stage shutter mounted on the rod with the possibility of reciprocating movement, a damping cavity is located in the housing of the return valve apana and is limited by a cover and a multi-stage shutter, air windows are placed on the side walls of the housing with the possibility of their communication with the secondary air supply channel in communication with the exhaust manifold through the exhaust channel, made in the form of an ejector nozzle.

 Figure 1 shows the proposed device for supplying secondary air; figure 2 - installation on the exhaust manifold of the internal combustion engine of the proposed device.

 The proposed device for supplying secondary air comprises a damping cavity 1 formed by a multi-stage shutter 2 freely moving along the stem 3 and a check valve cover 4, in which purge windows 5 are made. The check valve cover 4 is mounted in the check valve body 6, in which the channel is located secondary air supply 7. An outlet channel of the non-return valve, made in the form of a nozzle of an annular ejector 8. is attached to the body of the check valve 6. The device is installed on the exhaust manifold 9 of the internal combustion engine.

 The exhaust system of the internal combustion engine with the secondary air supply device operates as follows: during operation of the internal combustion engine, the exhaust gases move along the exhaust manifold 9 (Fig. 2) with pressure fluctuations due to the working process of the engine.

 Moreover, with the passage of the pulsating flow through the nozzle of the ejector 8, secondary air is ejected. The experimental results show that when a pulsating ejector operates in certain modes, a sharp increase in the ejection coefficient occurs, i.e. increased secondary air supply.

 In a well-known work, it is noted that giving the active stream the shape of a circular jet is one of the ways to increase the efficiency and energy exchange of active and passive flows.

 When a rarefaction wave propagates in the exhaust manifold 9 (FIG. 2), air through the purge windows 5 (FIG. 1) enters the secondary air supply channel 7, the outlet channel of the non-return valve, made in the form of an ejector nozzle 8, and enters the exhaust manifold 9 ( figure 2), while ensuring the oxidation process of the combustion products of the internal combustion engine.

 When the compression wave in the exhaust manifold 9 passes through the outlet channel of the non-return valve, made in the form of an ejector nozzle 8, and through the secondary air supply channel 7, it enters the body of the non-return valve 6. Under the action of the compression wave, the multi-stage shutter 2 is pressed against the cover 4 (FIG. 2) and ensures tightness of the structure.

 The multi-stage shutter 2, moving along the stem 3, compresses the air in the damping cavity 1. The air compressed in the damping cavity 1 provides the return of the multi-stage shutter 2 to its original position with a subsequent decrease in the pressure in the exhaust gas flow, which reduces the inertia of the system and increases the durability of the secondary feed device air.

 The actuation speed of the multi-stage shutter 2 and the amount of secondary air supplied is provided by adjusting the clearance.

Claims (1)

 A SECONDARY AIR SUPPLY DEVICE comprising at least one non-return valve installed in the housing, with a cover and side walls, a damping cavity, air windows and a secondary air supply channel in communication with the exhaust manifold of the engine, characterized in that, in order to increase efficiency , it additionally contains an exhaust channel, a rod located in the housing, and a multi-stage shutter mounted on the rod with the possibility of reciprocating movement, the damping cavity is located in the housing the check valve and is limited by a cover and a multi-stage shutter, air windows are placed on the side walls of the housing with the possibility of their communication with the secondary air supply channel in communication with the exhaust manifold through an exhaust channel made in the form of an ejector nozzle.

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