JPH0118863Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses an electric pump to pump up liquid.
And when the liquid is supplied to another container, an automatic stop that can automatically stop the operation of the electric pump when the liquid level in the container reaches the conical surface of the liquid level sensor. This relates to an electric pump.

The relationship between the liquid level sensing section and the liquid outflow pipe in a conventional electric pump of this type is as shown in FIGS. 4a and 4b. That is, a partition wall 31a is provided so as to divide the inside of the liquid outflow pipe 31 into two, and a housing part 34 that houses the liquid sensing element 32 and is provided with a conical surface 33 is integrally formed in the right half of the liquid outflow pipe 31. After that, liquid enters into the liquid level sensing part 35 through the gap between the outer periphery of the liquid level sensing part 35 and the inner periphery of the liquid outflow pipe 31, causing the liquid level sensing part 35 to malfunction. To prevent this, waterproof adhesive 36 is applied around the entire circumference of the liquid level sensing part 35.
I was trying to do that. In addition, 37 is a liquid inflow hole,
38 is an air exhaust hole, 39 is a connection cord for the liquid sensing element 32, and this connection cord 39 and the liquid level sensing part 3 are connected to each other.
5 is waterproofed with adhesive 40.

However, in the conventional configuration described above, when the liquid level sensing part 35 is installed in the liquid outflow pipe 31, the entire circumference of the liquid level sensing part 35 is covered with waterproof adhesive 36, so that the liquid level sensing part 35 may malfunction. In this case, it becomes impossible to take out the liquid level sensing portion 35 and repair it, and as a result, the entire electric pump must be discarded as a defective product, which is very uneconomical. Furthermore, the necessity of waterproofing in the assembly process is unreasonable in terms of mass production.

The present invention has been devised to solve the above-mentioned conventional problems, and the present invention will be explained below based on drawings showing embodiments thereof. Figure 1 shows the configuration of an automatic stop electric pump, where 1 is the power supply section;
Reference numeral 2 denotes an electric control circuit section housing an electric control circuit (not shown), 3 a pumping pipe, 4 an electric pump body containing a motor (not shown), etc., and 5 communicating with the pumping pipe 3. The connected discharge pipe 6 is a liquid outflow pipe having a built-in liquid level detection section.

Figures 2a and 2b show the internal structure of the liquid outflow pipe 6. In these Figures 2a and 2b, 7 is a pipe connecting the liquid outflow pipe 6 and the discharge pipe 5, and 8 is a liquid level sensing section. The liquid level sensing section 8 includes a storage section 11 that stores a liquid sensing element 9 made of a photocoupler or the like and has a conical surface 10 at its lower end, and a liquid sensing chamber 12 provided below the conical surface 10. , a liquid inlet hole 13 provided below the liquid sensing chamber 12, and an air outlet 14 provided on the side of the liquid sensing chamber 12 and communicating with the hole 6a provided in the side wall of the liquid outflow pipe 6. It is constituted by a rectangular cylindrical air outlet portion 15 formed. Reference numeral 16 denotes a connection cord for the liquid sensing element 9, and the connection cord 16 and the liquid level sensing section 8 are waterproofed with an adhesive 17. Reference numeral 18 denotes a guide provided protruding from the inner wall of the liquid outflow pipe 6, and the guide 18 has a U-shaped cross section with a ceiling portion. 19 is a fixing boss formed protruding from the inner wall of the liquid outflow pipe 6 so as to correspond to the guide 18; 20 is a fixing boss integrally formed on the lower end side wall of the liquid level sensing portion 8 so as to protrude outward; A screw through hole 21 is provided in this fixing part 20. When the liquid level sensing section 8 is installed inside the liquid outflow pipe 6, the liquid level sensing section 8
is inserted from the lower end opening of the liquid outflow pipe 6. In this case, the air outlet part 15 of the liquid level sensing part 8 is inserted into the guide 18 of the liquid outflow pipe 6, and the fixing part 20 of the liquid level sensing part 8 is applied to the lower surface of the fixing boss 19 of the liquid outflow pipe 6. , it is detachably attached by screwing one screw 22 into the fixing boss 19 through the screw through hole 21.

FIG. 3 shows an example in which two screws 22 are used to detachably attach the liquid level sensing section 8 to the liquid outflow pipe 6.

In the above configuration, the operation of the automatic stop type electric pump will be explained. When the switch 23 shown in FIG. 1 is turned on, a motor (not shown) in the electric pump main body 4 rotates, and liquid is pumped up by the action of pump vanes (not shown). The pumped liquid passes through the pumping pipe 3 and the discharge pipe 5, reaches the liquid outflow pipe 6, flows out from the outer periphery of the liquid level sensing section 8, and is supplied to a container (not shown). Due to this supply, when the liquid level in the container reaches the liquid level sensing part 8, the liquid is transferred to the liquid level sensing part 8.
enters the liquid sensing chamber 12 through the liquid inlet hole 13,
When it reaches the conical surface 10, the light from the liquid sensing element 9 is transmitted through the conical surface 10 into the liquid, so that the light receiving side cannot receive the light, and as a result, the electric control circuit section 2 is activated. Then, the power supply to the motor in the electric pump main body 4 is stopped. This stops the pumping of the liquid, that is, the liquid supply. Also, at this time, the air in the liquid sensing chamber 12 is discharged to the outside from the hole 6a of the liquid outflow pipe 6 via the air outlet 14 of the air outlet 15, so that the liquid that has entered through the liquid inflow hole 13 is reliably removed. A conical surface 10 is reached.

As described above, according to the present invention, since the liquid level sensing part is detachably attached to the liquid outflow pipe, even if the liquid level sensing part breaks down, the liquid level sensing part can be taken out from the liquid outflow pipe and repaired. In addition, since the conventional bonding process is not required, it is possible to provide a product that is extremely rational in terms of mass production.

[Brief explanation of the drawing]

Fig. 1 is a side view of an automatic stop electric pump showing an embodiment of the present invention, and Fig. 2 shows the internal structure of the liquid outflow pipe in the same pump, where a is a longitudinal cross-sectional view and b is a bottom view. , Fig. 3 is a bottom view of another embodiment of the same liquid outflow pipe, and Fig. 4 shows the internal structure of the liquid outflow pipe in a conventional electric pump.
A is a vertical cross-sectional view, and b is a cross-sectional view. 1...Electric pump body, 5...Discharge pipe, 6
...Liquid outflow pipe, 6a... Hole, 8... Liquid level sensing section, 9... Liquid sensing element, 10... Conical surface, 11
... Storage section, 12 ... Liquid sensing chamber, 13 ... Liquid inflow hole, 14 ... Air outlet, 15 ... Air outlet.

Claims (1)

[Scope of utility model registration request] The electric pump body includes an electric pump body, a discharge pipe for discharging the liquid pumped by the electric pump body, a liquid outflow pipe connected to the discharge pipe, and a liquid level sensing section provided in the liquid outflow pipe, and The sensing section includes a storage section that stores a liquid sensing element and is provided with a conical surface, a liquid sensing chamber provided below the conical surface, a liquid inlet hole provided below the liquid sensing chamber, and a liquid sensing chamber provided below the conical surface. an air outlet section provided on the side of the chamber and having an air outlet communicating with a hole provided in the side wall of the liquid outflow tube, and the liquid level sensing section is detachably attached to the liquid outflow tube. An automatic stop electric pump characterized by the fact that it is installed.