JPS592367Y2 - Electric flow proportional control valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric flow rate proportional control valve that controls the opening and closing of a slide type valve using an electromagnetically operated linear motor to control the communication flow rate of four flow bodies.

In general, this type of electric control valve consists of a hollow iron core, a bobbin slidably disposed on the core, and a permanent coil disposed so that the magnetic flux passes at right angles to the windings of the electromagnetic coil on the bobbin. A magnet, a linear motor section made of a magnetic material that forms a magnetic circuit of the permanent magnet together with an iron core, and a slide-type valve section that opens and closes a communication hole on the iron core to control the flow rate of fluid that communicates the input port and the output port. The bobbin is actuated in response to the input terminal value applied to the electromagnetic coil, and the fluid communication flow rate is controlled in response to the bobbin.

Both ends of the winding of the electromagnetic coil were connected to respective terminal terminals via a pair of spring means that also had the function of urging the bobbin to a non-operating position.

In other words, the spring means had the function of transmitting an input current from the terminal terminal to the electromagnetic coil.

More specifically, the connections between both ends of the winding of the electromagnetic coil and the pair of springs were made on the bobbin or at a position very close to the bobbin.

Therefore, if the bobbin is made of metal, there is a disadvantage that the positive and negative electrode sides will be short-circuited at the connection between the electromagnetic coil and the spring, resulting in no current flowing through the electromagnetic coil, making it impossible to achieve the valve function. was there.

However, if the bobbin is made of resin insulation material,
The forming accuracy of the bobbin inner diameter corresponding to the iron core that requires a desired small tolerance is reduced, and the wear resistance is deteriorated, which is a disadvantage. Even if you try to eliminate profits,
In a resin bobbin with a metal sleeve, the radial length increases, the clearance between the permanent magnet and the iron core increases, and the desired attractive force is generated in response to an input electrical signal applied to the electromagnetic coil. At any time, it would be a disadvantage.

Therefore, the object of the present invention is to prevent short-circuiting between the positive and negative electrodes of the power source at the electromagnetic coil spring child joint.

In order to achieve this object, the present invention includes an insulating member fixed on the bobbin to support one end of the spring means, and an immovable eyelet member crimped and fixed to the insulating member. The connection portions between both ends of the spring means and the spring means are fixed by soldering 72 via the fitting member 7, and the soldering portions are further protected with an insulating resin.

By adopting this configuration, the connection between both ends of the winding of the electromagnetic coil and the pair of means leading to the power source is made of an insulating part fixed to the bobbin + an insulating resin that protects the soldered part. Since it was completely protected by P, the problem of short circuit between the positive and negative terminals at the relevant connection point was solved.
This eliminates the disadvantage that current does not flow through the electromagnetic fill at the desired time3.Furthermore, as mentioned above, we have provided protection for the connection, so the bobbin is made of a metal material with excellent forming precision and wear resistance. Therefore, the clearance between the permanent magnet and the iron core can be reduced, and the suction force of the bobbin can be reduced.

Now, as mentioned above, this type of electric flow rate proportional control valve is
One end of the spring means is connected to an electromagnetic coil, and the other end is connected to a terminal terminal, and the bobbin is axially sloughed in response to an input terminal applied to the electromagnetic coil. It is something.

At this time, since the spring means repeats the expansion and contraction operation as the bobbin is displaced, a large load is applied to the movable end of the spring means, that is, the connection part between the spring means and the electromagnetic coil.

Therefore, the fixing of this connection requires sufficient strength to withstand the expansion and contraction of the spring means.

According to the structure of the present invention, the 117 member is fixed to the insulating member by caulking, and the connection part is fixed by soldering through the 117 member, so the fixation of the connection part is determined by its strength. will be sufficiently secured.

An embodiment according to the present invention will be described below with reference to the accompanying drawings.

In the electric flow rate proportional control valve 10 shown in the drawing, a magnetic body cover 15 having a second output port 14 is integrated with a magnetic body 13 to which the manual port 11 and the first output port H2 are fixed. and are airtightly coupled.

A hollow iron core 18 is disposed on the shaft +2 on the bobbin 13, and the inner hollow part of the iron core is divided into a first chamber 20 and a second chamber 21 by a blocking wall 19.

The first chamber 20 communicates with the first output port 12, and the second chamber 21 communicates with the second output port 1.
A metal bobbin 22 made of non-magnetic material is slidably disposed on the bobbin, and an electromagnetic coil 23 is wound on the bobbin.

Further, a pair of permanent magnets 24.25 are arranged by magnetic support members 16.17 fixed to the body 13 so that the magnetic flux passes at right angles to the windings of the electromagnetic coil 23.
In this way, the magnetic circuit of the permanent magnets 24, 25 is formed by the iron core 1B, the supporting members 16, 17, the body 13, and the cover 15, and constitutes a movable two-fill type linear motor.

The hollow core 18-[, includes the first chamber 20 and the capo-I-1
The 0th communication hole 2B that communicates with 1 and the capo that enters the 2nd chamber 21
! -11, a plurality of second communication holes 29 are formed in each of the four long holes.

The bobbin 22 slides over the first and second communicating holes 28 and 29 in proportion to the current value applied to the electromagnetic coil 23 to control the opening areas of the communicating holes 28 and 29.

At this time, the bobbin 22 acts so that when one communication hole is closed, the other communication hole is opened. The communication between the two is alternately switched and controlled.

A spring holder 30 is disposed between the hollow iron core 18 and the magnetic body 13, and two coil springs 31 and 32 having different center diameters are stretched within the holder 30.

The bobbin 22 is always biased to the left in the figure by both springs 31 and 32, and when no current is applied to the electromagnetic coil 23, the bobbin 22 comes into contact with the collar 33 formed on the body 13.
As a result, the bobbin 22 is held in a position where the first communication hole 28 is closed and the second communication hole 29 is opened.

An insulating resin member 26 that holds one end surface of the springs 31 and 32 is fixedly arranged on the bobbin 13, and heat conductive eyelet members 35 and 36 are fixed to the insulating resin member 26 by caulking.

The connections between the ends 31a, 32a of both springs 31, 32 and the ends 23a, 23b of the electromagnetic coil 23 are fixed by soldering through eyelet members 35, 36, and the soldering It is protected by insulating resin 33 and 34.

In this way, both ends 23a of the electromagnetic coil 23. 23b and one end 31a, 32a of the springs 31, 32, respectively, are connected to the insulating resin member 26 and the insulating resin 3.
3.34, and at the above connection both springs 31.3 leading to the positive and negative poles of the power supply.
2 is prevented from being short-circuited, and current does not fail to flow through the electromagnetic coil 23 at a desired time.

Each other end of both springs 31, 32 (only the other end 32b of the spring 32 is shown) is connected to a heat conductive eyelet member 37.
extends through the hole 30a of the holder 30 to be crimped, and connects to the corresponding terminal terminal (the other end 3 of the spring 32).
(Only the terminal 3B corresponding to 2B is shown) is connected by soldering or the like.

Both terminal terminals are appropriately connected to the positive and negative electrodes of a power source via connectors 39, and are supported by an insulating support member 40 within a notch 41 of the cover 15, and are held by an insulating resin 42.

43 is attached to the cover 1 via a silicone rubber seal member 44.
5 is an adjustment screw screwed into the holder 3, and its inner end is screwed into the holder 3.
0, and by screwing the screw forward and backward, the position of the holder 30 can be adjusted, and as a result, the urging force of both springs 31 and 32 can be adjusted.

Reference numeral 45 denotes an O-ring sealing member disposed between the holder 30 and the cover 15, which cooperates with the silicone sealing member 44 to seal the inside and outside of the cover 15.

A return spring 46 arranged between the support member 16 , 17 and the holder 30 is connected to the holder 30 and thus to the bobbin 22 .
This is to ensure the return of the
If the biasing forces of both springs 31 and 32 are set appropriately, the provision of the return spring is not necessarily required.

Incidentally, the biasing force of the return spring 46 is also the same as that of the screw 4B.
It can be adjusted by

Next, the operation of the above configuration will be explained.

When no input current is applied to the electromagnetic coil 23, the bobbin 22 is biased to the left in the figure by both springs 31, 32 and the return spring 46, and is in a position where the first communication hole 28 is closed and the second communication hole 29 is opened. is maintained.

Therefore, the input port 11 is cut off from the first output port 12 and communicated with the second output port 14.

In addition, under normal conditions, a closed-loop magnetic circuit is formed by the magnetic flux generated from the permanent magnets 24 and 25 via the hollow core 1B, the support member 16 and 17, the body 13, the cover 15, etc., and a part of it is connected to the electromagnetic coil 23. There is.

In this state, when an input current is applied to the electromagnetic coil 23, a force proportional to the current value is generated in the right direction in the figure due to the well-known attention 1j of Fleming's left hand.

Therefore, the bobbin 22 is actuated and displaced in the right direction in the figure against the biasing forces of both springs 31 and 32, and as a result, the first communication hole 28 is opened and the second communication hole 29 is closed.

The first and second communication holes 2B, 29 have a sufficient length in the axial direction, and the first and second communication holes 2B and 29
The opening area of the communication hole 2B increases and the opening area of the second communication hole 29 decreases.

In this way, the bobbin 22 provides communication between the input port 11 and the first output port 12 and communication between the second output port 14.
It functions as a so-called three-way type control valve that performs switching control alternately.

The electric flow rate proportional control valve 10 of the above embodiment may be used, for example, in an exhaust gas purification system for an automobile engine, with the input port 11 connected to an air pump, the first output port 12 connected to an exhaust system, and the second output port 12 connected to an exhaust system. If the output port 14 is connected to an air cleaner and the electromagnetic coil 23 is configured to receive an input electric signal by a computer or the like that generates an output signal according to engine temperature, engine negative pressure, engine rotation speed, etc., the well-known method can be used. The function of a secondary air supply system can be achieved.

[Brief explanation of drawings]

The figure is a sectional view of an electric flow rate proportional control valve showing an embodiment of the present invention. 10゛Electric flow rate proportional control valve, 11: Input port, 12
．． 14: Output port, 13: Body, 15: Cover 1
8: Iron core, 22: Bobbin, 23: Electromagnetic coil, 24.2
5: Permanent magnet, 26: Insulating resin member, 2B, 29
: Communication hole, 3i, 32 spring, 38: Terminal terminal.

Claims (1)

[Scope of utility model registration request] a body having an input port and an output port; a hollow core disposed on a shaft within the body and having a communication hole communicating the two ports; an opening area of the communication hole disposed slidably on the core; a bobbin for controlling the magnetic field; a permanent magnet disposed so that a magnetic flux passes perpendicularly to the winding of the electromagnetic coil wound on the bobbin; a magnetic body forming a magnetic circuit of the permanent magnet together with the iron core; Electric flow rate proportional control having a pair of spring means that urges the bobbin in a direction to fully close the communication hole, and whose one end is connected to both ends of the winding of the electromagnetic coil and whose other end is connected to a terminal terminal. The valve includes a heat conductive eyelet member crimped to an insulating member fixed on the bobbin and supporting one end of the spring means, the connection between both ends of the winding of the electromagnetic coil and the spring means. An electric flow rate proportional control valve, characterized in that the part is fixed by soldering through the eyelet member, and the soldered part is further protected with an insulating resin.