JPS5838231Y2 - Drain height - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic drain discharge device that automatically discharges drain generated in an air tank storing compressed air.

Conventionally, various methods have been used to discharge the drain.

For example, there is a device that uses a timer to supply current for a certain period of time at regular intervals, and opens a solenoid valve provided in the drain discharge pipe to discharge the drain.

Since the amount of drain generated varies greatly depending on the pressure of the air compressor, high/low temperature, humidity, etc., it is impossible to completely discharge the drain without letting compressed air escape.

In addition, a mechanism consisting of many stacked cams sends a current at regular intervals to open a solenoid valve to discharge the drain, and the discharge time is adjusted by shifting the cams and changing the angle of action of the cams. There is something.

In order to shift the cam, arc parts that overlap each other are required, and it is impossible to adjust the ejection time to less than the ejection time corresponding to this arc, and it is uneconomical to manufacture a large number of cams, and it is difficult to adjust. It is a hassle to remove the lid of the device every time.

In order to eliminate the above-mentioned drawbacks, this invention is a complete automatic drain discharge device that allows you to adjust the discharge time of the solenoid valve from always closed to always open according to the time indicated by simply turning the knob attached to the front of the device. It provides:

This will be explained below with reference to the drawings. In FIG. 1, 1 is an air tank that stores compressed air.

A normally closed solenoid valve 2 for discharging the drain is provided and connected to a discharge pipe 3.

An operating coil 4 that provides opening and closing operations to the solenoid valve 2 is connected to an actuator 1 in which a cam 8 is attached to a microswitch 9.
When 0 is pressed and the normally open contact 12 is closed, it is connected to the power supply circuit.

In FIGS. 2 and 3, 7 is an electric motor supported by legs 13, 14 equidistant from the center.

A cam 8 is fixed to the motor shaft by a set screw 41.

The leg 13 is fixed to a mounting plate 18 so that the center of the electric motor can move in the direction of the arrow.

The bolt 16 that supports the leg 14 is. It is inserted into the mounting hole 19 of the mounting plate 18 so as to be movable in the direction of the arrow.

The spring 21 is sandwiched under load between the head 17 of the bolt 16 and the protrusion 230 of the mounting plate 18, and the hole 2 of the protrusion is inserted.
4 and the inner diameter of the spring 21, screw it into the female thread 25 of the head of the bolt 160, and move the leg 14 in the direction of the arrow to move the center of the cam 8 in the direction of the arrow. 10, and the time that the normally open contact 12 is held closed is displayed as shown in FIG. 6, for example.
Turn the knob 34 to match the indication A, and then secure the bolt 16 with the nut 20.

In Figures 2, 4 and 5, 26 is an arm whose lower end (hereinafter the same name in the drawings) is inserted into a fixed pin 27 so that it can move in the direction of the arrow. A microswitch 9 and an actuator 10 are fixed to.

A spring 30 is supported by a guide pin 31.

The spring 30 is inserted between the mounting plate 18 and the microswitch 90 with a mounting load greater than the maximum operating load when the normally open contact 12 is closed by the cam 8.

An adjustment shaft 32 is provided at a position that divides the distance between the push button 11 and the pin 27 into an appropriate ratio.

The adjustment shaft 32 is loosely fitted into the hole of the boss 33 until the flange 350 surface contacts the inner surface of the boss 33, and a knob 34 is fixed to the tip thereof so as to contact the outer surface of the boss 33.

The right side of the adjustment shaft (in the drawings, the same applies hereafter) has a right-handed thread with an appropriate pitch, passes through a hole 37 on the side of the arm 26, and a nut 38 having a spherical seat at its tip contacts the side of the arm 26. It is screwed all the way up.

Reference numeral 40 denotes a rotation stopper plate which is fixed so as to be able to come into contact with the flat diameter surface 39 of the nut 38 and to be able to slide thereon.

The display shown in Fig. 6 shows the position of the knob □34.
It is written on the front surface of the mounting plate 18.

OFF and ON are indications indicating that the normally open contact 12 is always open or closed regardless of the 80 rotations of the cam.

Other indications are, for example, A indicates the position of the maximum holding time at which the normally open contact 12 always opens and closes stably when the knob 34 is turned from OFF to ON, and the position of the maximum holding time is indicated by G, for example. The display sequentially represents each position obtained by dividing the angle between A and G into n parts, for example, into six equal parts, and the calculated discharge time of the solenoid valve 2 is written at each position.

44 is a stopper pin for knob 34.

With the above configuration, this device has the following effects.

Drain generated from compressed air is accumulated in the lower part of the air tank 1.

The cam 8 is fixed to the shaft of the electric motor 7 and rotates, and its peak contacts the actuator 10, presses the push button 11, closes the normally open contact 12, sends current, and opens the solenoid valve 2 to drain.

The discharge action of the solenoid valve 2 continues as long as the actuator 10 is in contact with the cam ridge 80, but at the same time as the cam falls from the cam ridge 80, the normally open contact 12 returns to its previous position due to the springing force, and the current is reduced. The discharge action of the solenoid valve 2 is stopped.

This stopped state is achieved by the actuator 10 due to the cam 80.
continues until it is pushed up to the operating position (the position of the actuator 10 when the normally open contact 12 closes).

The amount of time that the normally open contact 12 is held closed varies depending on the operating position of the actuator 10 on the cam 80.

If the operating positions are at the same operating point of the cam crest (the point of contact with the cam crest when the actuator is in the operating position), the times during which the normally open contacts 12 are held closed will be equal.

Since the operating position of the microswitch generally varies slightly, in order to match the time shown in Fig. 6 with the discharge time of the solenoid valve, it is necessary to use the electric motor 7 with the cam 8 fixed to the shaft.
Before installation, it is necessary to adjust the position of the cam 8 and thus the position of the motor 7 so that the operating position of the switch is at the same operating point of the cam 8.

In this device, the center of cam 8 lies on the bisector of the distance between legs 13 and 14.

When the bolt 16 supporting the leg 14 is moved up and down with the leg 13 as the center by the rotation of the adjustment bolt 22 and the load of the spring 21, the amount by which the center of the cam 8 approaches or moves away from the actuator 10 relative to the amount of movement of the bolt 16 is Extremely small.

According to calculations, it is several minutes.

Therefore, by turning the adjustment bolt 22, it is possible to precisely adjust the distance between the cam 8 and the actuator 10, and the operating position of the actuator 10 can be aligned so that it is at the same operating point of the cam 8. switch 9
It is possible to make the time period during which it is held closed constant.

For example, when turning the knob □34 in Figure 6 to set it to display A,
The time during which the normally open contact 12 of the microswitch is held closed, that is, the discharge time of the solenoid valve 2, can be made to coincide with the time indicated by indication A.

In the arm 26 to which the microswitch 9 is fixed,
The back of the microswitch 9 is supported by a spring 30 having a mounting load larger than the maximum operating load of the switch, and the arm 26 is attached to a nut 38 from a direction opposite to the direction in which the spring 30 is loaded, with the pin 27 as the center. Since the microswitch is supported, its position is always stable for the operation of the microswitch.

When the operating position is at the foot of cam 8. Even after the front opening contact 12 is closed, the peak of the cam 8 pushes the actuator 10, but the spring 30 is compressed and the arm 26 moves to the pin 27.
The microswitch 9 moves in an arc to the left with .

This prevents the cam 8 from receiving an excessive operating load.

When the arm 26 moves in an arc to the left, the spring 3
A gap that is reduced by the lever ratio of the compressed dimension is created between the side of the arm 26 and the nut 38, but since the nut 38 cannot be rotated by the rotation stopper plate 40, its position is immovable. , at the same time that the actuator 10 falls from the cam 80, the arm 26 is moved by the spring 30.
It is possible to return to the old position by applying a load of .

In Figure 6, the cut position is between nut 38 and adjustment bolt 22.
Determined by adjusting.

When turning the knob □34 from the off position to the stopper pin 44, the adjusting shaft 32 cannot move in the axial direction and the nut 38 cannot rotate either, so the nut only moves by the multiplicative product of the rotation angle ratio of the knob 340 and the thread pitch of the adjusting shaft 32. 38 moves to the right.

Under the load of the spring 30, the arm 26 rotates to the right around the pin 27 while keeping its side surface in contact with the spherical seat of the nut 38, and is enlarged by an appropriate lever ratio, causing the actuator 10 to approach the cam 8. However, its operating position is within the bottom circle of the cam 8, and the normally open contact 12 is always closed regardless of the rotation of the cam 8.

The position of the knob 34 at this time is tangential on the display.

When turning the knob □34 from off to on, there is always a minimum holding time and a maximum holding time during which the normally open contact 12 always opens and closes stably.

The position of the minimum retention time is indicated by display A, and the position of the maximum retention time is indicated by display G, and the time is marked in each.

The angle between the displays A and G is divided into n parts, for example, into six equal parts, and each position is displayed in order, and the calculated time is recorded in each part.

When the microswitch is replaced, set the knob 34 to, for example, indication A and adjust the cam operating point with the adjustment bolt 22 to match the time that the normally open contact 12 is held closed to the time indicated by indication A. I can do things.

When the knob 34 is set to display B, the nut 38 moves to the right according to the rotation angle, and the lever ratio is enlarged, and the operating position of the actuator 10 moves toward the bottom of the slope of the cam 8 with the same dimensions. .

The time during which the normally open contact 12 is held closed in this case is also displayed B
match the time.

Similarly, in other indications advanced by the same angle, the time during which the normally open contact 12 is held closed corresponds to the time of one indication.

That is, by matching the start positions, the holding time and the displayed time will match even at other positions advanced by the same angle.

According to the present invention, even though the operating position of the microswitch is subject to variations, the operating point of the cam is adjusted during assembly so that the discharge time of the solenoid valve matches the time indicated in a planned manner in advance. It is not only useful for mass production, but also
When in use, the discharge time of the solenoid valve can be adjusted to match the time indicated by 1, and the discharge time can be adjusted continuously from disconnection to connection, making it easier to injure the pharynx.
In addition, you can check whether the adjustment is appropriate or not by adjusting the knob to drain the air at any time, so the drain, which changes depending on the capacity of the air compressor, pressure level, temperature, humidity, etc., can be completely drained without letting the compressed air escape. It is possible to obtain an automatic drain discharging device that can discharge the drain immediately.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the present invention, and FIG. 2 is a sectional view of the structure of the present invention. However, the knob 34 is a sectional view taken along line H-H in FIG. 6, and FIGS. D and CC sectional views, 5th
Figures 1 and 2 are partial views of Figure 2, viewed from directions A and B.

Claims (1)

[Claims for Utility Model Registration] Regarding the electric motor 7 in which the cam 8 is fixed to the shaft. A mechanism that adjusts the operating point of the cam by moving the other leg 14 in an arc with one leg 13 as the center, and an arm 26 that fixes the micro switch 9 and moves in an arc with the pin 27 as the center. One side is supported by a spring 30, and the other is supported by a screw 32 and a nut 38 that can be turned from the outside.
When turning one screw. An adjustable automatic drain discharge device in which the discharge time of a solenoid valve can be adjusted by a mechanism that gives an arcuate movement to the arm and adjusts the operating position of a microswitch.