JPS641711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow control valve device, and more particularly to an electric flow control valve device that controls a flow rate in proportion to a command electric signal.

2. Description of the Related Art Conventionally, a flow control valve device has been proposed for appropriately controlling the supply of air to an intake manifold of an engine by bypassing a throttle valve of a vehicle, thereby controlling an air-fuel ratio. However, if the engine has been stopped for a long time, especially in a cold region, the movable part of the flow control valve device may freeze due to moisture in the air, making it impossible for the valve to operate. This has led to disadvantages in that smooth desired operation cannot be guaranteed. This ultimately leads to the disadvantage that even if it is desired to supply air to the intake manifold, sufficient air is not supplied, making it impossible to start the engine.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a novel electric flow control valve device that eliminates the disadvantages of the prior art described above.

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

In Figures 1 and 2, an electric flow control valve device 1
0 has a body 13 having an input port 11 and an output port 12, and a cover 14 integrally coupled to the body 13 in a hermetically sealed manner. A hollow iron core 17 made of a magnetic material and having an internal space chamber 16 communicating with the output port 12 is disposed on the axis inside the body 13 via a fixing member 15 to the body 13.
A bobbin 18 made of a non-magnetic material is slidably disposed on the bobbin 7 . The bobbin 18 has an electromagnetic coil 1
9 is wound around a pair of permanent magnets 20, 2 so that the magnetic flux passes perpendicularly to the winding direction of the electromagnetic coil 19.
1 is fixedly disposed on the body 13. The body 13 is made of a magnetic material, and includes permanent magnets 20, 2.
A magnetic circuit for the magnetic flux generated by the magnet 1 is formed together with the iron core 17, thereby configuring a moving coil type linear motor.

A plurality of elongated communication holes 23 are formed on the hollow core 17 to communicate the internal space chamber 16 and the external space 22 leading to the input port 11.
The opening of 3 is connected to the slide valve part 2 which is integrated with the bobbin 18.
4 is now slidable. Therefore, electromagnetic coil 1
When a current is applied to the port 9, the slide valve portion 24 integrated with the bobbin 18 operates according to the current value, and controls the opening area of the communication hole 23 to open proportionally, thereby opening the input port 11 and the output port 12. It is something that allows communication.

The bobbin 18 is connected to both ends of the electromagnetic coil 19 via an insulating member or the like at a flange portion 25 disposed on the bobbin, and is constantly operated by two coil springs 26 and 27 made of electrical conductors and having different center diameters. It is biased toward the left in the figure. As a result, under normal conditions, the slide valve portion 24 is maintained at the illustrated closed position in which the communication hole 23 is fully closed, and its left end is in contact with the elastic stopper 28 on the fixed member 15. The other ends of the coil springs 26 and 27 are connected to terminal terminals 30 and 3 held via an insulating member 29.
1 by soldering or the like, and are connected to a power source as appropriate.Both coil springs 26 and 27 also function as electrical signal transmission means for transmitting electrical signals from the computer to the electromagnetic coil 19. . Both coil springs 26 and 27 are secured to an insulating retainer 32 at each other end.
The retainer 32 is adjusted in position in both left and right directions in the drawing by screws 34 that are screwed into the cover 14 through a sealing member such as silicone rubber, and both springs 26 and 27 that bias the bobbin 18 in this manner are attached. You can adjust your forces accordingly.

Inside the hollow core 17, a temperature sensing valve device 35 is provided.
are arranged, so that an appropriate number of openings 36 arranged on the iron core 17, a right side external space chamber 37 on the iron core 17 provided so as to be connected to the left side external space chamber 22, and an internal space are provided. Communication between the bypass passage including the space chamber 38 and the internal space chamber 16 is controlled to be communicated or interrupted in accordance with the sensed temperature change. That is, as is clear from FIGS. 1 and 2, the temperature sensing valve device 35 has a body 39 fixedly disposed within the iron core 17.
, a diaphragm 41 disposed on the body 39 via a holding member 40 , a wax 42 hermetically sealed within the body 39 by the diaphragm 41 , and a wax 42 that responds to the sensed temperature change. It has a valve body 43 that can be displaced to the right in FIG. 1 by volumetric expansion, and the valve body 43
Communication between the two chambers 38 and 16, that is, opening and closing of the bypass passage, is controlled by contacting and separating from a valve seat 44 fixedly disposed therein. The valve element 43 is biased by a spring 45, one end of which is engaged with the valve seat 44, to the position shown in the first figure, where its shoulder 46 abuts against the right end of the body 39, so that the sensed temperature reaches a predetermined value. When the volume of the wax 42 is not expanded and the valve body 43 is in the state shown in the first figure, both chambers 3
Communication between 8 and 16 is allowed. Valve body 43
The left rod-shaped portion 47 is configured to be accommodated by the diaphragm 41. When the wax 42 detects a temperature higher than a predetermined value and expands in volume, the spring 45 is activated via the diaphragm 41.
The valve body 43 moves to the right in FIG. 1 against this movement and comes into contact with the valve seat 44, thereby blocking the space between the chambers 16 and 38, that is, the bypass passage.

In the above configuration, the operation of the electric flow rate valve device 10 will be explained. When no input current is applied to the electromagnetic coil 19, the bobbin 18 is urged leftward in the drawing by both springs 26 and 27, and is held in a position where the communication hole 23 is closed. Therefore, the input port 11 is cut off from the output port 12. Further, under normal conditions, a closed-loop magnetic circuit is formed by the magnetic flux generated from the permanent magnets 20 and 21 via the hollow iron core 17, the body 13, the cover 14, etc., and a part of the circuit is connected to the electromagnetic coil 19. In this state, when an input current is applied to the electromagnetic coil 19, according to the well-known Fleming left hand rule,
A force proportional to the current value is generated in the right direction in the figure. Therefore, the bobbin 18 is actuated and displaced in the right direction in the drawing against the biasing forces of both springs 26 and 27, and as a result, the slide valve portion 24 is actuated in the direction to open the communication hole 23. The communication hole 23 has a sufficient axial length,
In proportion to the amount of rightward displacement of the slide valve portion 24,
The opening area of the communication hole 23 increases.

The input port 11 of the electric flow rate control device 10 of the above embodiment is connected to the upper side of the throttle valve of the vehicle, and the output port 12 is connected to the lower side of the throttle valve. If the configuration is such that a current value responsive to an output signal corresponding to the rotational speed is applied, the well-known idle rotational speed control system can be operated as desired.

In the above case, especially in a cold region, when the movable parts such as the slide valve part 24 integrated with the bobbin 18 are frozen due to freezing of moisture in the air, the volume of the wax 42 expands. temperature sensing valve device 35 is held in the first illustrated position;
Since the bypass passage is allowed to communicate, it is possible to supply the desired air and prevent the engine from stopping. In addition, the engine temperature rises due to engine warm-up, and wax 42
When the temperature sensor detects a temperature higher than a predetermined value, the temperature sensing valve 3
5 blocks the bypass passage, and thereafter the desired flow rate control is achieved by the aforementioned slide valve section.

3 and 4 show modified examples of the present invention, which differ in that a bimetal type temperature sensing valve device 50 is used instead of the wax type temperature sensing valve device described above. That is, bimetal 51
is sensing the temperature below a predetermined value, the third
The O-ring type valve seat 5 is in the illustrated state and is disposed on a holding member 52 that is fixed within the hollow core 17.
3, allowing communication between both chambers 16 and 38. Note that the ring 54 fixed within the iron core 17
The ring 54 is capable of coming into contact with the outer periphery of the bimetal 51 and functions as a contact means that allows the bimetal 51 to be reversed.The ring 54 is provided with an appropriate notch 55 to connect the chambers 16 and 38. Communication is guaranteed. When the bimetal 51 senses a temperature equal to or higher than a predetermined value, it is reversed as shown in FIG. In this way, the bimetallic temperature sensing valve device 50 according to this modification exhibits the same effects as the wax type temperature sensing valve device of the above-described embodiment.

As detailed above, in the electric control valve device according to the present invention, even when the engine is stopped for a long time in a cold region where the valve movable parts freeze, the temperature sensing valve device can be operated. This action has the practical effect of opening the bypass passage and allowing communication between the input port and the output port.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention;
FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIGS. 3 and 4 are cross-sectional views showing modified examples of the temperature sensing valve device of the present invention, showing states of temperatures below a predetermined sensing temperature and above a predetermined sensing temperature, respectively. be. 10...Electric flow control valve device, 11...Input port, 12...Output port, 13...Body,
14... Cover, 17... Hollow iron core, 18... Bobbin, 19... Electromagnetic coil, 20, 21... Permanent magnet, 23... Communication hole, 24... Slide valve section, 26, 27... Spring, 35,50...
Temperature sensing valve device, 36, 37, 38...bypass passage.

Claims (1)

[Claims] 1. A body having an input port and an output port, a hollow core disposed within the body and having a communication hole connecting the two ports, and an opening area of the communication hole disposed so as to be slidable on the outer periphery of the core. It has a slide valve type bobbin that controls the electromagnetic coil, a permanent magnet is arranged so that the magnetic flux passes at right angles to the winding of the electromagnetic coil wound on the bobbin, and a magnetic circuit for the magnetic flux generated by the permanent magnet. In a control valve device having a linear motor including a magnetic member formed together with the iron core, a bypass passage connecting the input port and the output port is provided, and when a temperature change detected in the bypass passage exceeds a predetermined value, An electric flow control valve device characterized by being provided with a temperature sensing valve that blocks a bypass passage.