JPS5872699A - Motor driven pump - Google Patents

Abstract

PURPOSE:To prevent freezing of a pump by protruding a good thermoconductive substance in a through hole, which is provided in a water passage in a motor driven pump having a pump part formed mostly in plastics, and by coupling it with a heating means. CONSTITUTION:A casing 5 mounted on the framing 2 of a motor 1 through a bracket 3 is formed in resin, equipped with a water passage 5a, intake port 5b and discharge port 5c, where a through hole 5d is bored at the outer end of this casing to house a good thermoconductive substance 9, which shall be inserted through and coupled watertightly. Thereby current is applied to an electric heater 8 for heating the water in the casing 5. Thus freezing is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electric pump, and in particular to an improvement in antifreeze means for a pump part formed substantially of t=m fat.

Electric pumps have lower manufacturing costs and lighter aluminum than conventional ones.
The pump part is being made of resin for the purpose of improving the sanitary department, etc., and is it suitable for cold regions or winter? This type of electric pump installed in an environment where the temperature drops is provided with means for preventing freezing and rain of water contained in the pump part in order to prevent damage to the pump part due to freezing.

This type of electric pump equipped with conventional anti-freezing means will be explained with reference to FIG. In the figure, l is 'electric motor, 2
is the frame of this electric motor 1, 8 is a load-side bracket connected to this frame 2e, 8a is an annular four portion provided on the inner circumference of this load-side bracket 8, and 4 is fitted into this annular recess 8a. 5 is one end e of the load side bracket 3.
A casing s5m formed of the bonded resin is a water passage of the casing 5, 5b is a suction port integrally molded with the casing 5, 50 is a discharge port provided in the casing 5, and 6 is a rotating shaft of the electric motor 1. It protrudes into the casing 5. Reference numeral 7 denotes a spiral-shaped flywheel fitted onto one end of the rotating shaft 6, which rotates within the water passage 5a. Further, this flywheel 7 is configured to communicate with the suction port 5bt. Reference numeral 8 denotes a heating means consisting of a 'lit thermal heater wound around the outer peripheral surface of the water passage 5a, which serves to keep the water inside the casing 5 warm and prevent it from freezing. In addition, the suction port 5b
A suction side hose whose one end portion is immersed in a water tank or the like is connected to the outlet 5C, and a discharge side hose (none of which is shown) is connected to the outlet 5C.

In this structure, when a predetermined amount of priming water is injected into the casing 5 and a power supply cable (not shown) connected to the electric motor is connected to a power source, the rotating shaft 6 and the fly wheel 7 rotate. The water in the water tank passes through the suction side hose, the suction port 5b, the fly wheel 7, the water passage 5a, and the discharge port 5C, and is discharged from the discharge side hose. When the electric pump is drawn out, the heating means 8 is passed through to prevent the inside of the casing 5 from freezing.

A conventional electric pump of this type is configured as described above.
In particular, since the heating means 8 is wound around the outer peripheral surface of the casing 5 made of resin, which is a poor conductor of heat, the heat transfer efficiency of the heating means 8 to the water inside the casing 5 is poor. For this reason, there was a drawback that the capacity of the heating means 8 had to be increased. Furthermore, since the heating means 8 has a large capacity, there is a drawback that power consumption increases.

The present invention has been made in an attempt to eliminate the drawbacks of this type of electric pump, and one embodiment of the present invention will now be described with reference to FIG. 2e. In the figure, 5d is a circular through hole provided at the outer end of the casing 5, and 9 is watertightly connected to the through hole 5d.
A is a good thermal conductor formed of, for example, a copper rod having a circular cross section and protrudes from the outer end surface of the casing 5, and the other end is adapted to come into contact with the water e inside the casing 5.

Reference numeral 8 denotes a heating means consisting of an electric heater wound around one end 9at of the thermally good conductor 9, which generates heat when energized and transmits heat to the water in the casing 5 via the thermally good conductor 9. This is done to prevent the water from freezing. The rest of the structure and operation are the same as those of the conventional electric pump, so the explanation will be omitted.

In this embodiment, an 'lfa pump is described in which a resin casing 5 in which a suction port 5b and a discharge port 5C are integrally formed is coupled to a load-side bracket 3 of an electric motor 1, but the invention is limited to this embodiment. rather than 'Itv
A through hole is provided in a water conduit pipe made of resin, for example, in the pump part, which is generally made of resin, which is connected to the J machine, and a good thermal conductor is connected through the through hole in a watertight manner, and one end is connected to the water conduit pipe. It may be made to protrude from the outer circumferential surface of the heating means, and this protrusion may be combined with a heating means.

As explained above, this invention provides a watertight structure in which a good thermal conductor is installed in the through hole provided in the water passage of the pump section, which is approximately formed of resin.
In addition, one end of the thermal conductor is made to protrude outward from the pump part, and the heating means is connected to this protrusion, so that the heat from the heating means is directly transferred to the pump part via the thermal conductor. Since it is transmitted to the contained water, the transmission efficiency from the heating means is significantly improved. Therefore, the capacity of the heating means 1
Since k can be significantly reduced compared to conventional electric pumps, power consumption is significantly reduced and material costs for the heating means are reduced, which is an excellent practical effect.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a conventional electric pump having heating means for a pump portion generally made of resin, and FIG. 2 is a partial cross-sectional view showing an embodiment of the present invention. In the figure, 1 is the electric motor, 5 is the casing, 5b is the suction port, 5C is the discharge port, 6
is a rotating shaft, 7 is a flywheel, 8 is a heating means, 9 is a good thermal conductor,
9a is a protrusion. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] (1) '[A pump part comprising a motor and a pump part formed substantially of resin to which the electric motor is coupled, wherein a water passage in the pump part is provided. An electric pump characterized in that a thermally conductive material is connected to the through hole in a watertight manner, one end of the thermally conductive material projects outward from the pump portion, and a heating means is connected to this projecting portion. (2) The electric pump according to claim 1, wherein the through hole is a circular through hole provided in a casing made of resin. Electric pump as described in section. (4) The electric pump according to claim 1, wherein the heating means is an electric heater having a predetermined capacity.