JPH094561A - Automatic stop type electric pump - Google Patents

Abstract

PURPOSE: To eliminate the malfunction of an automatic stopping mechanism, and to realize the miniaturization and cost reduction by moving a float in the vertical direction while guided by an outer circumference of a liquid outflow pipe at a liquid level sensing part comprising the float and a reed switch. CONSTITUTION: When a switch 13 is turned on, a motor in an electric pump body is driven, and the liquid leads into a liquid outflow pipe 6 by the effect of an impeller through a pumping-up pipe 3 and a discharge pipe 5. The liquid flows out of the outer circumference of a mold resin 9 part in which a reed switch 8 is fixed, and fed into a container. When the liquid level in the container is elevated to reach a float 11, the reed switch 8 is turned on by a permanent magnet 12. As a result, a control circuit part 2 is actuated to stop energization to the motor in the electric pump body 4. Pumping, i.e., feeding the liquid is stopped thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic stop type electric pump used for water supply and drainage to automobiles and general containers.

[0002]

2. Description of the Related Art A conventional automatic stop type electric pump is known, for example, from Japanese Patent Application Laid-Open No. 59-229076. According to this configuration, the liquid level sensing unit is a prism type optical sensor, and there is a malfunction such as stopping the liquid supply before the container becomes full,
Further, the float type liquid level sensor has a large number of parts and is large and expensive.

[0003]

According to the above structure, the prism type optical sensor is used as the liquid level sensing unit, the liquid jumps from the liquid level of the container by the liquid supplied from the liquid outflow pipe, and the prism unit is used. There was a case where the liquid supply stopped due to the malfunction of the liquid in the container even though the liquid in the container did not reach the full volume.

Further, in the case where a float that moves up and down in response to the liquid level in the container is used as the liquid level sensing unit, since the liquid outflow pipe and the float unit are usually separated, the number of parts is large and the size is large. Therefore, it could not be used in a container with a small liquid supply port.

An object of the present invention is to provide a compact and inexpensive automatic stop type electric pump which eliminates malfunction of the automatic stop mechanism.

[0006]

To achieve the above object, the present invention provides a float guided by the outer periphery of a liquid outflow pipe and moving up and down in response to a liquid level in a container, and a mold resin installed in the liquid outflow pipe. The reed switch is waterproof.

[0007]

The liquid outflow pipe of the present invention is a pipe serving as an outlet through which the liquid drawn up by the pump flows out.

The float is equipped with a permanent magnet, is guided by the outer circumference of the liquid outflow pipe, and moves up and down in response to the liquid surface.

The reed switch is waterproofed by a molding resin and is installed inside the liquid outflow pipe, and the liquid flows around the outer periphery of the reed switch and is discharged from the liquid outflow pipe into the container. Further, it is turned on by being excited by the permanent magnet of the float raised by the supply of the liquid.

With the above operation, it is possible to obtain an automatic stop type electric pump that is small in size and highly reliable without liquid level sensing, that is, malfunction of the automatic stop mechanism.

[0011]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the structure of an automatic stop type electric pump. Reference numeral 1 is a power source section, 2 is a control circuit section accommodating an electric control circuit (not shown), 3 is a pumping pipe, and 4 is a motor. An electric pump body incorporating an impeller (not shown) (not shown), 5 is a discharge pipe connected so as to communicate with the pumping pipe, and 6 is a liquid outflow pipe provided with a liquid level sensing unit. is there.

FIG. 2 shows a detailed structure of the liquid outflow pipe 6, where 7 is a pipe connecting the liquid outflow pipe 6 and the discharge pipe 5, 8 is a waterproof treatment with a mold resin 9, and the liquid outflow pipe 6 is shown.
And a reed switch positioned and fixed by the upper end of the bottom lid 10, the permanent magnet 12 is provided, the upper limit is the protrusion of the liquid outflow pipe 6, the lower limit is the bottom lid 10, and the lower end of the liquid outflow pipe 6 is provided. It is a float that is guided by the outer circumference and moves up and down.

The operation of the automatic stop type electric pump according to the present invention having the above structure will be described.

When the switch 13 shown in FIG. 1 is turned on, a motor (not shown) in the main body of the electric pump rotates, and the liquid is pumped up by the impeller (not shown) and the discharge pipe 5 is discharged. Then, the liquid reaches the inside of the liquid outflow pipe 6, and then flows out from the outer periphery of the mold resin 9 in which the reed switch 8 is fixed and is supplied to the container. By this supply, the liquid surface of the container reaches the float 11, and when it rises, the reed switch 8 is turned on by the permanent magnet 12 installed in the float 11. As a result, the control circuit unit 2 operates to stop energizing the motor (not shown) in the electric pump body 4. As a result, pumping up, that is, liquid supply is stopped.

On the other hand, in the case where the prism type optical sensor is used for the liquid level sensing unit like the conventional product, the liquid supplied from the liquid outflow pipe jumps up from the liquid level of the container and adheres to the prism unit to malfunction. , There was a problem that the liquid supply stopped often even though the liquid in the container did not reach the full volume. Also, in the liquid level sensing unit that uses a float that moves up and down in response to the liquid level in the container, the liquid outflow pipe and the float unit are separate components, so the number of parts is large and the liquid supply port is large. Could not be used for small containers.

According to the embodiment of the present invention, it is possible to provide an automatic stop type electric pump which is small in size, inexpensive, and highly reliable without causing any trouble in the automatic stop mechanism.

[0018]

【The invention's effect】

 (1) The malfunction of the automatic stop mechanism is eliminated.

(2) The number of parts can be reduced, and the size and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of an automatic stop type electric pump showing an embodiment of the present invention.

FIG. 2 is a sectional view of a liquid outflow pipe in the pump.

[Explanation of symbols]

5 ... Discharge pipe, 6 ... Liquid outflow pipe, 8 ... Reed switch, 9 ... Mold resin, 11 ... Float, 12 ... Permanent magnet.

Claims (2)

[Claims] 1. A self-stopping electric pump comprising a motor, a pump, a control circuit, and a liquid level sensing unit including a float and a reed switch, wherein the float of the liquid level sensing unit is a liquid outflow pipe. A self-stopping electric pump that moves up and down while being guided by the outer periphery of the pump. 2. The reed switch is waterproof with a mold resin and installed inside the liquid outflow pipe.
Automatic stop type electric pump described in.