JPS6124587B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flow control solenoid valve device.

Conventionally, this type of device, as disclosed in Japanese Utility Model Application Publication No. 49-11465, attracts a movable magnetic core by the excitation action of an electromagnetic coil, and connects a valve member connected to the movable magnetic core to a fluid inflow path and a fluid outflow path. In order to reduce the force required to move the valve member into a position where it communicates with the body, the valve member is axially surrounded by a bellows-shaped tube having an average diameter substantially equal to the diameter of the valve member, and the ends of the bellows-shaped tube are connected between the body and the fluid. A sealed chamber is provided by fluid-tightly fixed between the surfaces of the valve member on the inflow path side via elastic packing, and a communication hole is provided in the valve member so that the pressure of the fluid in the fluid outflow path acts within the sealed chamber. A technique is already known in which the biasing force due to the pressure of the fluid acting on both surfaces of the valve member is balanced.

However, in this valve device, the structure of the fluid pressure compensating device consisting of bellows-shaped pipes, etc. is complicated, and the number of component parts increases, increasing the cost. In order to accommodate the compensating device, the body becomes larger, which has the practical disadvantage of increasing the size of the entire valve device.

Therefore, the present invention aims to achieve the following without complicating the structure.
The technical challenge is to operate the valve efficiently and reliably with a small electromagnetic force, and to reduce the size and weight of the entire valve device.

The technical means taken to solve the above technical problem is that one end of the movable core type valve can come into contact with a seat member disposed on the negative pressure port side, and the other end can contact the fixed core as appropriate. The movable core valve is spaced apart and further has an internal hollow part and a central wall partitioning the hollow part into a first chamber on the seat member side and a second chamber on the fixed core side. , one side of the central wall is constantly acted upon by negative pressure reaching the negative pressure port, and a communication hole that allows the negative pressure acting on the one side to communicate with the other side of the central wall communicates with the other side of the central wall. A communication hole is formed in the central wall to allow the passage of foreign matter into the sliding part of the core valve, and a spring that biases the movable core valve toward the seat member is stretched in the second chamber of the movable core valve. A foreign matter intrusion prevention means for preventing the intrusion of foreign matter is disposed in the communication hole or the negative pressure port.

In the above configuration, when the movable core valve is in a position where it contacts the seat member, the negative pressure reaching the negative pressure port and therefore the first chamber of the movable core valve is transmitted through the communication hole in the center wall. This reaches the second chamber, that is, negative pressure acts on both sides of the central wall, and eventually the urging force of the negative pressure on the movable core valve is balanced. Therefore, when current is applied to the electromagnetic coil, the movable coil valve operates quickly and in accordance with the applied current.In this way, the movable core valve can be operated efficiently with small electromagnetic force without complicating the structure. can be operated reliably, thereby making it possible to reduce the size and weight of the entire valve device.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 showing a first embodiment of the present invention, a flow rate control solenoid valve device 10 includes a first body 12 having an atmospheric port 11, and is sealed to the first body and is connected to an engine intake of a vehicle. It has a second body 14 with a negative pressure port 13 leading to the manifold.

A fixed core 16 is disposed within the first body 12 and one end of which is screwed into an inner circumferential screw of a support member 15 fixed to the first body 12.
A bobbin 18 on which an electromagnetic coil 17 is wound is disposed above. Both ends of the coil 17 are connected to an electric wire and the positive and negative electrodes of an appropriate power source through insulating support members fixed to the body 12, but in the drawing, only the insulating support member 19 on one side and the electric wire 20 on the other side are connected. It is shown. On the right inner periphery of the bobbin 18, there is a movable core valve 21 that is appropriately spaced from the fixed core 16.
are slidably arranged. The movable core type valve 21 is always biased rightward by the other end of a spring 22 whose one end is locked to the fixed core 16, so that the right end valve portion 21 of the valve 21
A is in contact with the elastic sheet portion 24 of the sheet member 23 that is normally fixed to the body 14, and blocks communication between the atmospheric port 11 and the negative pressure port 13. A magnetic member 25 is fixed to the inner circumference of the body 12, and in this way, the fixed core 16, the supporting member 15,
Body 12, magnetic member 25, movable core valve 2
1 constitutes the magnetic circuit of the coil 17.

The movable core type valve 21 has an inner central wall portion 2
6, which allows the intake manifold negative pressure reaching the negative pressure port 13 to be transmitted not only to the right chamber 28 of the valve 21 defined by the center wall 26 but also to the spring 22.
It is also possible to constantly transmit the information to the left chamber 29 where the air is accommodated. Therefore, the valve 21 is biased in opposite directions by the negative pressure in both chambers 28 and 29, and the negative pressure influence is eliminated by balancing both biasing forces.

Note that a filter 30 is held by the spring 22 so that one side of the filter 30 is in contact with the center wall 26 in the left chamber 29, and the filter 30 is not protected by the backfire of the engine or the like. This prevents soot and the like contained in the combustion gas from reaching the left chamber 29 through the communication hole 27, and prevents soot and the like from entering between the outer periphery of the valve 21 and the inner periphery of the bobbin 18, thereby preventing the stay of the valve 21. Preventing the phenomenon from occurring.

Note that if the gap between the right end of the fixed core 16 and the left end of the movable core valve 21 is too narrow, the seat portion 24
If the distance between the valve 21 and the valve 21 is not sufficient, the desired valve function cannot be achieved, and if the gap is too wide, a large suction force is required and the valve device itself must be enlarged. Therefore, in order to obtain the above-mentioned gap as desired, the fixed core 16 may be screwed in and out of the support member 15 as appropriate.

The operation of the flow rate control magnetic valve device configured as described above will be explained next.

Under normal conditions, when no current is applied to the electromagnetic coil 17, the movable core valve 21 is in the illustrated position due to the spring 22, and the right end valve portion 21
Since a is in contact with the seat portion 24, communication between the negative pressure port 13 and the atmospheric port 11 is blocked.

Now, depending on the driving condition of the vehicle, the electromagnetic coil 17
When a predetermined current is applied to the valve 21, the valve 21 is attracted to the left against the spring 22 by the magnetic circuit described above. Therefore, the right-end valve portion 21a of the valve 21 is separated from the seat portion 24, and the atmosphere flows from the atmospheric port 11 to the negative pressure port 13, and is transmitted to the vehicle's intake manifold, thereby performing the well-known engine idle up function. .

In the device of the present invention described above, when the valve 21 is in the illustrated position, the negative pressure reaching the negative pressure port 13 and therefore the right chamber 28 of the valve 21 is transmitted through the communication hole 27. It reaches the left chamber 29 of the valve 21, and as a result, since the negative pressure biasing force against the valve 21 is balanced, the current is applied quickly and
The effect is that the valve 21 acts depending on the applied current. Furthermore, the outer circumference of the valve 21 and the bobbin 18
Since a filter 30 is disposed between the inner periphery of the valve as a foreign matter prevention means to prevent foreign matter such as soot in unburned gas from entering during engine backup, the valve stick phenomenon is prevented. There is also.

FIG. 2 shows an embodiment in which a ball-type check valve 33 is disposed in the negative pressure port 13 in place of the filter of the above-described embodiment, and which normally comes into contact with the second seat 32 of the seat member 23 by a spring 31. It is. Therefore, the check valve 33 allows negative pressure to flow from the port 13 to the valve 21, but prevents positive pressure unburned gas from flowing from the port 13 to the valve 21 during engine backup. are doing. Other configurations and operations are similar to those of the above-described embodiment, and it is obvious that the effects detailed in the above-described embodiment can also be achieved in this modified example.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flow rate control solenoid valve device showing one embodiment of the present invention, and FIG. 2 is a partial sectional view of a flow rate control solenoid valve device showing a modification of the present invention. 10...Flow rate control solenoid valve device, 11...Atmospheric port, 12, 14...Body, 13...Negative pressure port, 1
6... Fixed core, 17... Electromagnetic coil, 18... Bobbin, 21... Movable core type valve, 21a... Valve portion, 22... Spring, 23... Seat member, 2
7...Communication hole, 30...Filter, 33...Check valve.

Claims (1)

[Claims] 1 A body having an atmospheric port connected to an atmospheric source and a negative pressure port connected to a vehicle intake manifold negative pressure source, a fixed core disposed within the body, and an electromagnetic A bobbin around which a coil is wound, a magnetic body that forms a magnetic circuit of the electromagnetic coil together with the fixed core when a predetermined current is applied to the electromagnetic coil, and a spring that normally interrupts communication between the two ports. and a movable core valve that is slidable within the bobbin so as to be sucked into a position that allows communication between the two ports when the magnetic circuit is formed. , the core-type valve has one end that can come into contact with a seat member disposed on the negative pressure port side, and the other end of the core-type valve that is disposed at an appropriate distance from the fixed core; It has an internal hollow part and a central wall part that partitions the hollow part into a first chamber on the sheet member side and a second chamber on the fixed core side, and one side of the central wall part is connected to the negative side. A communication hole is formed in the center wall, which is constantly acted on by the negative pressure reaching the pressure port, and allows the negative pressure acting on one side to communicate with the other side of the center wall, and the spring is connected to the core-type valve. A flow rate control solenoid valve device, wherein a foreign matter intrusion prevention means is provided in the second chamber and is disposed in the communication hole or the negative pressure port to prevent foreign matter from entering the core-type valve sliding portion.