JPS63131891A - Drain up pump for air conditioner - Google Patents

Abstract

PURPOSE:To prevent the blinding of a suction opening from taking place by locating the lower end of an impeller which rotates in opposition to a casing, in such a manner that it is in the same plane as the lower end of the casing, or it is projected beyond the plane of the lower end of the casing. CONSTITUTION:On the lower end of the shaft 2 of a rotational driving motor 1 is provided a raised section 31 which is projected beyond the lower end of a casing 4 and has a diameter smaller than that of a liquid suction opening 6. Even if a deposit, sludge or the like is generated in the neighborhood of the liquid suction opening 6 which is immersed in the drain water 10, the quantity of the deposit and the like generated and led to the suction opening 6 is reduced to a small quantity by virtue of the suction pressure caused by the rotation of an impeller 3 and the turning force of the raised section 31. Thereby, the suction of exhaust of a drain can be performed efficiently.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a drain-up pump for air conditioners.

[Conventional technology]

In the conventional device, as described in Japanese Utility Model Application No. 59-154897 and Japanese Utility Model Application No. 60-77790, the tip of the impeller is located inside the casing lake surface and between the casing protrusion and the impeller tip. It had a structure with space.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the problem of clogging of the pump suction port due to sludge accumulated in the drain water (water scale, atmospheric dust, etc.); When draining drain water, the drain water contains dust, organic matter, and inorganic matter dissolved in the atmosphere, so water scale matures and grows after long-term use, reducing the diameter of the suction port and eventually causing may block the suction port. In addition, as shown in Figure 3, the pump suction port is often installed at the lowest position where drain water flows down, and dirt and streaks accumulate and block the suction port, making it impossible to drain the drain water. . For this reason, in cases of severe soiling, it was necessary to disassemble the air conditioner and inspect and clean the built-in pump, etc.

An object of the present invention is to prevent clogging of the suction port of a pump.

Means for Solving Problem C] The above purpose is to
This is achieved by making the rotating impeller lower end position 11 the same as the casing lower end position or by making the impeller lower end position protrude beyond the casing lower end position.

[Effect]

When the impeller is driven and rotated by a rotary drive motor, scale 2 and sludge formation do not grow around the space in which the impeller rotates. For this reason, the lower end of the casing can always ensure a liquid suction port space and can efficiently suck and discharge the drain.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

The lower end of the shaft 2 of the rotary drive motor 1 has a protrusion 31 that protrudes from the lower end of the casing 4 and has a smaller diameter than the liquid suction port 6 of the casing 4 . The impeller 3 is press-fitted and fixed, the center of rotation of the motor 1 is aligned with the center t of the casing 4 having an inverted conical cross section, and the vertical dimensions of the motor 1 and the casing 4 are maintained. The guide 5 is the upper lid of the casing 4. 7 is a liquid outlet.

Therefore, even if water scale 8 or flange 9 is formed near the liquid suction port 6 immersed in drain water 10, the impeller 30
Due to the suction pressure caused by the rotation and the rotational force of the protrusion 310 of the impeller 3, the amount of water scale 8, flange 9, etc. generated at the suction port 6 of the casing 4 is extremely small.

Furthermore, the protruding portion 31 of the impeller 3 may be on the same surface as the suction port of the casing 4, and the same function as in the above case may be achieved.

According to this embodiment described above, there is always enough space around the rotating part of the protruding part 310 of the impeller 3 to allow drain water to flow, so that the pump suction port is not blocked with water scale or sludge.

Further, the protruding part of the impeller 3 may be formed into a protruding part 32 with an inverted downward shape as shown in FIG. .

Furthermore, the entire impeller 3 or the protruding portion may be formed like the three-way plate 33 shown in FIG. 1b.

〔Effect of the invention〕

According to the present invention, the formation of water scale and sludge at the casing suction port can be suppressed, and water scale and sludge exceeding a certain amount can be prevented by rotating the impeller, so that a liquid suction port can always be secured and drain can be sucked and discharged. can be done efficiently.

[Brief explanation of the drawing]

1 to 1b are longitudinal sectional views of a drain pump for air conditioning warfare according to an embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view showing locations where water scale occurs in a conventional drain pump VC. Diagram M3 is a vertical VF showing the state when sludge is being dumped using a conventional drain pump.
It is an r-plane view. 1... Drive motor 2... Motor shaft 3...
・Impeller 4...Casing 5...Guide 6...Liquid suction port 7...Liquid discharge port 31・
・Protrusion s 8... Water scale 9... Sludge
10... Drain water.

Claims (1)

[Claims] An impeller rotated by an electric motor is provided at the lower part of the shaft center, the liquid is sucked from the lower end of the impeller, and a suction port is provided at the upper end of the casing disposed along the outer core line of the impeller, and a suction port is provided at the lower end of the discharge port. A centrifugal drain-up pump that rotates and lifts suction liquid and discharges it from the discharge port by rotating the impeller, characterized in that the tip of the impeller at the lower part of the shaft center is flush with or protrudes from the lower end of the casing. Drain up pump for air conditioners.