JPH0231646Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention controls the amount of air bleed on the main side and slow side of an automobile carburetor.
This invention relates to an electromagnetic flow control valve that precisely controls air-fuel ratio (A/F).

(Prior technology) Conventional rotary solenoid valves have two systems: one input port (atmosphere side) and two output ports (main side, slow side) for simultaneously controlling the air bleed amount on the main side and slow side of the carburetor. ] When controlling the flow rate of two output ports independently, pressure interference between the two output ports becomes a problem, so separate flow control passages are provided for each (if one input port controls the flow rate of two output ports, , there is a risk of pressure interference.Provide two input ports and two atmospheric chambers inside the valve, and separate the input from the output so that there is one atmospheric chamber and one output port for one input port. In addition, it was necessary to control with one input port (providing two or more input ports would cause problems in product manufacturing, piping, and installation compared to the case with one input port). (in order to avoid pressure interference mentioned above,
The cross-sectional area must be large enough to allow sufficient air to flow into the valve body. Furthermore, if the pressure interference tolerance is set to 0.5% or less of the negative pressure applied to one port, the cross-sectional area of the atmospheric passage should be no more than three times the cross-sectional area of the negative pressure port, as shown in Figure 5. Therefore, there was a drawback that the valve structure became large. Note that the above-mentioned pressure interference means that when the output ports A and B (FIG. 4) and the input port communicate with each other, negative pressure is introduced into the valve body from the A and B ports, and the inside of the valve body becomes negative pressure. Furthermore, if there is a difference between the negative pressures of the A and B ports, the negative pressure of one port will be smaller than the negative pressure within the valve body, and there is a risk that air will flow into the valve body from the output port (backflow of air). To prevent this (so that negative pressure does not develop within the valve body), an input port is required that can supply a sufficiently large amount of air relative to the air flow rate of the output port.

(Problem to be solved by the invention) In the conventional control valve, the input port does not have a sufficiently large cross-sectional area compared to the output port.
When controlling the outputs of two or more systems using one input port, there is a risk that pressure interference will occur and air will flow backwards. Therefore, when controlling two or more systems with one control valve, one input port and one atmospheric chamber are required for one output port, and securing this requires a large space. ,
The disadvantage was that the valve structure was large.

This invention has a large input port (more than three times the cross-sectional area of the output port) to prevent pressure interference even when the output port is fully open, and the atmospheric chamber also has a cross-sectional area equal to that of the input port. The present invention aims to provide an electromagnetic flow control valve that requires only one input port and one atmospheric chamber even if there are two or more output ports, and the valve structure does not become large.

[Structure of the idea]

(Means for Solving the Problems) Therefore, the present invention provides a motor section that generates electromagnetic force by forming a magnetic circuit from a center core, a solenoid coil wound around a bobbin on the core, and an outer yoke. It has a permanent magnet rotatably arranged in a magnetic circuit, a valve rotor that rotates together with the magnet, a bearing member that rotatably holds the valve rotor, one input port, and a plurality of output ports. In the apparatus, the valve rotor is provided with a plurality of through holes having different phases, each of which can communicate with each of the output ports through a plurality of openings provided in the bearing member. , and the through hole communicates with the input port through the opening provided in the bearing member and through an atmospheric chamber in the resin valve body, and the input port has an inner diameter three times or more that of the output port, and The atmospheric chamber has a cross-sectional area equivalent to the cross-sectional area of the input port, and this is used as a means for solving the problem.

(Operation) When a current flows through the solenoid coil, a magnetic circuit is formed by the coil, the center core, and the outer yoke, and a rotational force is applied to the permanent magnet arranged in the effective gap of this magnetic circuit. When the permanent magnet rotates, the valve rotor rotates, and one output port communicates with the input port through one through hole, and the other output port also communicates with the input port with a predetermined phase difference. . In this manner, the degree of communication between the input port and each output port is controlled by the rotation of the valve rotor.

As described above, in the present invention, the input port has an inner diameter more than three times that of the output port, and the atmospheric chamber has a cross-sectional area equivalent to the cross-sectional area of the input port. This eliminates the problem of pressure interference, eliminates the need for a large valve structure even with just one input port, and produces effects such as the ability to reduce the size of the product.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Figs. 1 to 3 show an electromagnetic flow control valve device in an embodiment of the present invention. A bobbin 2 is fitted onto the bobbin 2, and a solenoid coil 3 connected to an appropriate power source is wound around the bobbin 2, and the coil 3 is integrally molded with resin during the connector molding. In addition, a pair of yokes 4 and 5 and a yoke 33 made of magnetic material
A motor section 6 is constituted by the core 1 and the coil 3 to form a magnetic circuit, and the motor section 6 is connected to the resin valve body 7 by the outer yoke 4,
5,33.

As shown in FIG. 2, the valve body 7 has an input port 8, a first output port 9, and a second output port 1.
0 is formed. The input port 8 has an inner diameter three times or more that of the output ports 9 and 10, and is connected to an engine air cleaner (not shown) to receive air supply, and the first and second output ports 9 and 10 are connected to the engine's carburetor. are connected to the main air bleed and slow air bleed, respectively.

Further, at the upper end of the valve body 7, a permanent magnet 11 is rotatably arranged in the effective gap of the magnetic circuit formed by the motor section 6, and the outer circumferential surface of the magnet 11 is connected to the yoke 4 press-fitted into the valve body 7. A gap 13 is formed between them. The permanent magnet 11 is fixed to the valve rotor 14 via a resin bush 15 which also serves as a thrust bearing, so that the permanent magnet 11 can rotate integrally with the valve rotor 14.

The valve rotor 14 is formed with two through holes 16 and 17 having different phases, and a torsion spring 18 that biases in one direction is disposed at one end of the valve rotor 14. The load of the spring 18 can be arbitrarily set within a predetermined range by a spring holder 19.

Furthermore, a valve rotor 14 is disposed within the valve body 7.
A bearing member 20 rotatably held is inserted and fixed, and the bearing member is formed with openings 20a and 20b that can communicate with the first and second output ports 9 and 10, respectively, and that communicate with the input port 8. Atmospheric chamber 2
1 is formed with openings 20c and 20d that allow husband and wife communication. This bearing member 20 and the valve rotor 14
A valve mechanism is thus formed. In addition, 22
2 is a steel ball for fixing the permanent magnet 11 on the valve rotor 14 together with the bush 15, and 23 is a metal cover that is press-fitted into the valve body 7 and serves both as a sealing function and as a stopper in the axial direction of the valve rotor 14. Further, the cross-sectional area of the atmospheric chamber 21 is approximately the same as the cross-sectional area of the input port 8. Reference numeral 24 denotes a spring adjuster which is inserted into the valve body 7 and whose outer periphery is sealed with an O-ring 25 and which is also inserted into the body 7. The adjuster 24 has a projection set in the groove 27 of the spring holder 19. It is integrally coupled with the holder 19.

The outer end of the torsion spring 18 is inserted and fixed into the groove 26 of the spring holder 19 made of resin, and the inner end is inserted into the groove 26 of the spring holder 19 made of resin.
It is locked in the groove 28 at one end, and its tip 29 abuts against the protrusion 30 of the bearing member 20 that protrudes in the direction of the biasing force of the spring 18, so that it cannot move in the direction of the biasing force from that position. It's getting old. Reference numeral 31 denotes a driver groove provided on the outer surface of the spring adjuster 24. When assembling, a screwdriver is engaged with the groove 31 to remove the spring adjuster 2.
4 and the spring holder 19 to adjust the torsion force of the torsion spring 18, the adjuster 24 is fixed to the yoke 5 by filling with silicone rubber 32, and the adjuster 24 and the holder 19 are rotated. make it impossible.

Next, the effect will be explained. First, solenoid coil 3
When a current flows through, a magnetic circuit is formed by the coil 3, the center core 1, and the outer yokes 4, 5, and 33, and a rotational force is applied to the permanent magnet 11 disposed in the gap of this magnetic circuit. When the permanent magnet 11 rotates, the valve rotor 14 rotates against the urging force of the torsion spring 18. The input port 8 is formed by the valve body 7,
It communicates with the atmospheric chamber 21 inside the valve. coil 3
When a current is applied to the valve rotor 14, the valve rotor 14 rotates, and the output ports 9 and 10 communicate with the atmospheric chamber through the through holes 16 and 17. As a result, the input port 8 and the output ports 9 and 10 communicate with each other, and fluid flows from the atmospheric port 8 to the output ports 9 and 10 via the atmospheric chamber 21 and the through holes 16 and 17. The amount of rotation of the valve rotor 14 is proportional to the current applied to the coil. Further, the flow rate of air flowing into the output ports 9, 10 is proportional to the communication area between the through holes 16, 17 and the output ports 9, 10. Therefore, output ports 9, 10
The flow rate of air flowing through the coil 3 can be controlled by the current flowing through the coil 3.

When the valve rotor 14 is located in the position shown in FIG. fully communicated,
Atmospheric air corresponding to the hole diameter is supplied from the port 8 to the port 10. On the other hand, the through hole 16 of the valve rotor 14
communicates with the openings 20a, 20c of the bearing member 20 in a predetermined phase, so that the input port 8 and the first
Atmospheric air is supplied between the output ports 9 according to the effective area. In this manner, the degree of communication between the input port 8 and the output ports 9 and 10 is controlled by the rotation of the valve rotor 14. Next, solenoid coil 13
When the power to the torsion spring 18 is stopped, the torsion spring 18
The restoring force causes the valve rotor 14 to return to its original adjustment position.

Figures 4 and 5 are explanatory diagrams of pressure interference between output ports A and B due to input port inner diameter dimensions, respectively, and Figure 5 is a diagram showing the relationship between input port inner diameter and B port negative pressure. , If the allowable pressure interference between ports B is 0.5% or less of the negative pressure applied to one port (-2 mmHg or less in the case of Fig. 5), if the inner diameter of the input port is three times or more than the inner diameter a of the B port. This indicates that the negative pressure is -2 mmHg or less.

[Effect of idea]

As explained in detail above, the present invention has an input port having an inner diameter three times or more that of the output port, and
Since the atmospheric chamber is configured to have a cross-sectional area equivalent to the cross-sectional area of the input port, there is no problem with pressure interference between the output ports, and there is no need for a large valve structure even with one input port, resulting in a smaller product size. It has the following effects:

[Brief explanation of drawings]

Fig. 1 is a plan sectional view of an electromagnetic flow control valve showing an embodiment of the present invention, Fig. 2 is a sectional view taken from A to A in Fig. 1, and Fig. 3 is a sectional view taken from B to B in Fig. 2. FIG. 4 is an explanatory diagram showing pressure interference between output ports due to input port inner diameter dimensions, and FIG. 5 is a B port (output port) output negative pressure characteristic diagram with respect to the atmospheric port (input port) inner diameter. Explanation of the main parts of the diagram, 1...center core, 2...
...Bobbin, 3...Solenoid coil, 4, 5, 3
3... Outer yoke, 6... Motor section, 7... Valve body, 8... Input port, 9... First output port, 10... Second output port, 11... Permanent magnet, 14... Valve rotor , 16, 17... Through hole, 18... Torsion spring, 20... Bearing member, 21... Atmospheric chamber, 20a, 20b, 20
c, 20d...opening.

Claims (1)

[Scope of utility model registration request] A motor section that generates electromagnetic force by forming a magnetic circuit from a center core, a solenoid coil wound around a bobbin on the core, and an outer yoke; a permanent magnet rotatably disposed in the magnetic circuit; In an apparatus comprising a valve portion comprising a valve rotor that rotates integrally with a magnet, a bearing member that rotatably holds the valve rotor, and a valve body having one input port and a plurality of output ports, the valve The rotor is provided with a plurality of through holes having different phases, each of which can communicate with each of the output ports through a plurality of openings provided in the bearing member, and the through hole is different from the input port in the bearing member. The input port communicates with an atmospheric chamber in the resin valve body through another pair of openings in the same phase as the opening provided in the valve body, and the input port has an inner diameter three times or more that of the output port, and An electromagnetic flow control valve having a cross-sectional area equivalent to the cross-sectional area of the input port.