JPS5989874A - Fixed-pressure relief valve for air control valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This relates to the constant EIJIJ-7 valve used.

In order to control exhaust gas from automobile engines,
A secondary air control system is being installed in the damaged vehicle to improve engine combustion and exhaust gas production. An air control system typically includes an air pump driven by the engine to supply air and a number of configurations of the engine exhaust system in response to a number of electrical, hydraulic or pneumatic actuation signals. The part includes an air side m* for directing the discharge air of the pump.

Back pressure is created by the secondary air control system, particularly by the large number of restrictions in the air flow system. Furthermore, since the air pump is driven by the vehicle's engine, changes in the pump rotational speed will cause back pressure fluctuations which, if not limited, can damage the pump.

U.S. Patent No.', 4/lrJ,! A pneumatic control valve such as that disclosed in No. 3 includes a spring-loaded relief valve. However, this relief valve has the disadvantage that when back pressure is generated, the IJ-) pressure is not constant with respect to the pump rotation speed or air flow rate, but increases as the rotation speed or tri-air flow rate increases.

The present invention provides a constant pressure I for an air control valve configured so that the pressure from an air pump does not exceed a predetermined value regardless of the pump rotation speed, air flow rate, or back pressure in the system.
We offer JIJ-fu valves.

Hereinafter, an example of the present invention will be explained in detail with reference to the accompanying drawings.

In the drawings, the constant pressure IJ valve 10 shown in FIG.
housing/2, discharge orifice or rrr port/6
The housing is preferably molded with a plastic bevel capable of withstanding the environmental conditions within the engine compartment of an automobile, and comprises a flow restrictor, a diaphragm, and a valve member 20 within the inlet orifice or port, 2.2 and discharge orifice straddle boat/A-i'il. Insert the valve seat λ in the first chamber 2q of the housing 7.2 into the first core orifice.
Finished with 6 and b.

The flow restrictor /q, which is arranged in or connected to the discharge orifice /6 of the housing saw, is entirely equipped with a sound deadening material, which is not shown in the drawings in this embodiment. This noise-absorbing material acts as a throttle when air is discharged from the housing 2, increasing the upper part of the first chamber 2 of the housing saw, and is intended to reduce exhaust noise.

Diaphragm made of rubber bellows/gd housing/
2, and divides the housing into a seventh chamber 2q and a second chamber -g. Both the artificial orifice 2.2 and the discharge orifice/B are provided in the 7th chamber 2g. Air circulation between compartments 2q and 2g is blocked by a diaphragm/g.

There is a bento boat 1.λt on the wall of room 2g, and all bento boats above the room are covered.

Valve section 44 operatively connected to tire diaphragm/g
．． 20 i. J: , extending from the diaphragm/g to person 1
-7F ifB month] 0 is movable in a direction perpendicular to 17F and is guided by a guide pin 30Vc extending from the wall of the housing/λ. The f-circle bottle 30 extends into the guide pipe section of the square section θ, and cooperates with the valve gB. 20 All valves are exposed to the seat 6 and held at an angle.Tit: The target biasing device, that is, the spring 3, urges the valve holder θ toward the valve seat 6. Work ni,
Seven or more vent boats 29 are provided at the bottom of the housing/space, and the atmosphere E, which becomes the M EVE force, is provided in the first chamber 2q.
F-VC)t! I feel worried. Therefore, the valve member -〇 is the valve seat. The upward force required to separate it from 2B is the combined force of the standard royal force and the spring 31.

In FIG. 1, the air control valve 3q with the constant pressure relief valve 10 shown in FIG. 1 is shown in longitudinal section. Air control disclosed in No. VC-jf VC, li is similar.

This US patent describes in detail the operation of air control valve 3q, which will be described below.

Air control valve 3<1! 'L air pump conduit 3 (not shown)
6, this conduit completely supplies the artificial orifice 22 vc7JI]E2 of the relief valve 10. Typically, the air pump is a vane pump driven from the drive shaft of the automobile engine via a belt f.

The vane pump converts the pulsating air flow into light, and as the pump rotates faster, the pulsation interval of the air flow becomes smaller and the air pressure increases.

Furthermore, the pump travel increases in proportion to the pump rotation speed.

Equipped with 3 g main switching valves for air + 1 + 1 1 cape, 3 g of main switching valves are used to switch the air flow from the pump to the entire exhaust system, or the operation of the car can be switched to the 1'J1 air system. Z if you are not sure about the air supply.

operates to discharge empty metal into the air. Since nitrogen gas generates noise when it passes through the orifice, a noise damping member 11λ is provided in the air control valve 3g between the pump-input robot gas and the vent boat so communicating with the atmosphere.

When the engine control device (not shown) requires the supply of Ω-order air to the exhaust system, the exhaust port 11'4 is closed to the valve port O of the switching valve 3g, and the air is transferred to the exhaust system communication boat q.
Either g or lI9 will be distributed to 10,000. Typically, in the mold,
- Connected to the exhaust manifold of the 10,000 port tl'9id engine on the other boat 11. g is connected to an exhaust system in the vicinity of a catalytic reactor (not shown). In most devices,
Does a temperature-sensitive vacuum switch help you choose which exhaust system connection boat to use? This is done by a vacuum motor controlled by 1tlJ. □ Constant pressure IJ according to the present invention IJ-F valve 1or1-1 is shown in constant communication with the pump-in robot 'iZ&. The inlet orifice 2.2 of the relief valve 10 receives the air flow directly from the air pump. The pressure i acting on the surface of the valve member 20 is such that it does not exceed a predetermined value determined by the operation of IJ IJ -7 IO.

When the relief valve 10 opens, the air flow and pressure from the air pump are transferred between the valve part of the valve 10 and the valve member 20.
It communicates with the 7th room-q through the whole area.

J′J through the first chamber 2Yf to the air? Flows to the output orifice/6, and after passing through the silencing shrine 1I2f, the vent boat S
It flows out into the atmosphere through θ. If the pressure in the first chamber 2q begins to rise above the pressure that causes the valve F member λ0 to be spaced apart from the valve seat uA, the diamond 7
It acts on the shim/g and the ax section 20 to further separate the opposing valve section. This results in increased airflow and valve member 20
u, an equilibrium point is reached where the pressure is obtained in the state where the valve member was initially separated from the valve seat 2B.

In addition to this increased pressure, there is a back pressure created by the pressure drop across the flow restrictor or muffler. 1st room 2Yf
The combined effect of the reference pressure, the force of the spring 32, and the back pressure makes the pressure of the air supplied to the exhaust system constant.

In a preferred practical example, the reference pressure of the first chamber 2Yf is a popular pressure, which is approximately OJ m for a certain IJ IJ-f pressure.
Hg-(,201nH5L). As shown in FIG. 3, the IJ-IJ-fmo characteristics with respect to the pump rotational speed or air flow rate in the relief valve 10vc of the present invention are constant as shown in actual results. IJ IJ-fu valve 10
In the conventional device in which only the seven chambers connected to the discharge orifice are ff1N, the relief pressure has a characteristic as shown by the broken line. In addition, the back pressure is added to the spring force of the relief valve, and as the back pressure increases, the relief pressure also increases.

Car, 2? As is clear from the illustration and explanation of the constant pressure relief -tp'/0 used in the air control valve in the air control device, the tire diaphragm/g forming the chamber 2gf which receives the reference pressure to be controlled by the In cooperation with the 4F member 20, which is additionally moved by the back pressure in the system, the relief pressure is kept constant.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a relief valve showing an embodiment of the present invention;
FIG. 2 is a longitudinal cross-sectional view of an air control valve equipped with the IJ IJ-7 valve according to the present invention, and FIG. 3 is a diagram showing the IJ IJ-7 positive characteristic of the IJ IJ-7 valve with respect to the rotational speed of the air pump. /θ・・Constant pressure relief valve, /kochu・ノ)Using, /l
I... Flow rate restriction, / B... Discharge orifice, 7g... Diaphragm, Kθ... Valve member, 22... Population orifice, Figure 2, 1st chamber, 2g1IΦth λ chamber, 3λ・φ spring, 3q ...Air control valve.

Claims (1)

[Claims] / One orifice (22) in communication with the air pump
and a discharge orifice (2) connected to the discharge orifice to generate a total pressure as a function of the air flow rate; (/6) The 1st house with metal fittings (the 2nd house (2g) that receives the lily and the royal power) and the 2nd house (2g) and the above-mentioned.
, and a valve member (20) connected to the tire flam.
the valve member (20)n, the artificial orifice 7;
When the pressure of the inlet orifice (22) is below the reference pressure, the doujin 1 core orifice is closed, but when the pressure of the inlet orifice is above the reference pressure, the doujin 1 core orifice is opened and the discharge orifice (/6) is opened. Ichikawa IJ-F for an air control valve, characterized in that it is configured to maintain a constant pressure i in the artificial orifice (22) by changing the movement of the valve member (-〇) according to the pressure. Valve〇〇 An elastic +I force device (3 slopes) is arranged in the second chamber (B), and the valve member (〇θ) is replaced in the closing direction of the above-mentioned 1 core orifice (22) f. A constant molymer relief valve according to claim 7, characterized in that: