JPH0637586U - Drainage pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an improved drainage pump that is free from the risk of failure due to water leakage or jetting, has low noise during operation, and is free from fluctuations in drainage noise. [Structure] A hollow shaft of a runner having blades vertically extending through a lid portion of a substantially conical pump case whose axis is vertical is provided in a watertight and rotatably pierce manner, and an internal space and a pump are provided under the runner shaft. An air hole communicating with the inside of the case is formed, and 1) a hollow drive shaft having an air hole communicating between the inner space and the outside of the pump case is fitted in the runner shaft or 2) the runner. An air hole is formed in the upper part of the shaft to connect the internal space to the outside of the pump case, and the drive shaft is fitted to the upper end of the runner shaft, or 3) The outside of the pump case is connected to the inner wall of the runner shaft. The object is achieved by a drainage pump having a structure in which a drive shaft is fitted while leaving a gap.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drainage pump, and more particularly to a pump suitable for continuously draining drainage generated from an air conditioner or the like.

[0002]

[Prior art]

 Drain generated from air conditioners does not always occur steadily, and it also contains dust. If it is attempted to install a drainage pipe for draining such a drain in a place where there is no inconvenience to the structure or aesthetics of a building, etc., the slope of the drainage pipe will not be able to be taken, so that clogging will easily occur. , Was causing the breakdown.

Therefore, it has been proposed to forcibly drain the drain with a drain pump. There is also a method of draining the pump by operating the pump when a certain amount of drain is accumulated in the drainage method, but a container for storing the drain is provided and a switch for detecting the drain storage level and opening / closing the power source of the pump is provided. It has to be large, and it is large and not economical. On the other hand, there is a method in which the pump is always operated and the drain is discharged each time it flows in.Therefore, a small drainage pump that is suitable for discharging the drain that contains dust etc. and whose flow rate fluctuates a lot has been proposed. (Japanese Utility Model Laid-Open No. 59-154897, Japanese Patent Laid-Open No. 61-104191, Japanese Utility Model Laid-Open No. 63-102989, etc.).

In such a conventional drainage pump, for example, as shown in FIG. 4, the pump case 1 is formed in a substantially conical shape, and the shaft 4 of the runner 3 has a large hole penetrating the lid portion 2 of the pump case. By forming and forming the air gap 5 for introducing air, the amount of air introduced is large when the amount of drain inflow is small, and the amount of air introduced is small when the amount of drain inflow is large, resulting in low drainage. It is designed so that noise can be discharged smoothly and continuously. However, in such a pump, if the drain inflow is large, the splash may be scattered from the gap 5, and when the operation is stopped, water may flow backward and spout from the gap 5 to wet the motor 6 and the like. Therefore, in order to prevent the occurrence of accidents due to such causes, measures such as providing a drain disc 7 on the upper end of the runner shaft 4 are taken.

[0005]

[Problems to be solved by the device]

 As described above, the conventional drainage pump for drain is liable to cause water splashes during operation, as well as the possibility that water may be ejected when operation is stopped, and drainage noise may be generated when the inflow of drainage changes. There was the problem of fluctuating and being extremely unpleasant. Therefore, an object of the present invention is to provide an improved drainage pump in which there is no fear of failure due to water leakage or spouting, noise during operation is small, and fluctuations in drainage noise are not noticeable. It is a thing.

[0006]

[Means for Solving the Problems]

 The first drainage pump of the present invention, which can achieve the above-mentioned object, is watertightly rotatable about a hollow shaft of a runner having blades suspended from a lid part of a substantially pyramidal pump case with the axis line being vertical. The air hole that connects the inner space with the inside of the pump case is formed in the lower part of the runner shaft, and the air hole that connects the inner space with the outside of the pump case is formed in the upper part. The drive shaft is fitted in the runner shaft.

The second drainage pump of the present invention also rotatably and watertightly penetrates a hollow shaft of a runner having vanes vertically extending from a lid portion of a substantially conical pump case whose axis is vertical. And an air hole that connects the internal space with the inside of the pump case is formed in the lower part of the runner shaft, and an air hole that connects the internal space with the outside of the pump case is formed in the upper part of the runner shaft. In addition, the drive shaft is fitted to the upper end of the runner shaft.

Further, in the third drainage pump of the present invention, the hollow shaft of the runner, which has blades extending vertically from the lid part of the substantially conical pump case whose axis is vertical, is watertightly and rotatably pierced. And an air hole that communicates the internal space with the inside of the pump case is formed in the lower part of the runner shaft, and the drive shaft is formed with a gap communicating with the outside of the pump case between the inner wall of the runner shaft. It has been fitted.

[0009]

[Action]

 In the drainage pump of the present invention, the air in the pump case is discharged together with the drain as a gas-liquid mixture by the centrifugal force generated by the rotation of the runner, and the inside of the pump case is depressurized. However, since a hollow runner shaft that penetrates the cover of the pump case in a watertight and rotatable manner is provided, the air outside the pump passes through the inner space of the runner shaft and the air holes in the lower part, and is assisted by centrifugal force. Since it is sucked into the case and evenly distributed as the runner rotates, there is no problem in air supply. Since such an air passage runs radially in the lower part of the runner shaft, as long as the runner is rotating, water rarely enters the runner shaft against centrifugal force, and unexpected water level fluctuations occur. Even if there is such a thing, the splash of water does not spout out of the pump case, and the noise does not leak easily through the curved path.

[0010]

【Example】

 (First Embodiment) FIG. 1 shows a first embodiment of the drainage pump of the present invention. In the figure, 1 is a pump case, and 2 is its lid. A runner 3 has a hollow runner shaft 4 and a disk body 3a perpendicular to the runner shaft 4. The inner space 4a of the runner shaft 4 communicates with the inside of the pump case through the lower air hole 4b, and the hollow drive shaft 6a of the motor 6 is inserted and fitted in the inner space 4a. The inner space 6b of the drive shaft 6a communicates with the inner space 4a of the runner shaft 4 at its lower end, and communicates with the outside of the pump case through the upper air hole 6c.

When such a drainage pump of the present invention is operated, the runner 3 is rotating vigorously, so that the air inside the pump case 1 is moved along the upper and lower surfaces of the disk body 3a by the action of centrifugal force. The flow and water are sucked from the suction port 1a at the bottom of the pump case body 1 and become a gas-liquid mixture together with air, and are discharged from the delivery port 1b. At this time, the air outside the pump case enters the inner space 6b from the upper air hole 6c of the drive shaft 6a, and is further sucked into the pump case through the inner space 4a of the runner shaft 4 and the lower air hole 4b. By the way, the amount of water in the pump case also fluctuates when the amount of drainage, etc. suddenly changes. At this time, even if the water level rises rapidly, centrifugal force works and the air passage of the runner shaft 4 is bent, so the inside of the air passage is bent. It is difficult for water to enter the area, and even if it does enter, the flow resistance is great, so water will not spout.

Second Embodiment FIG. 2 shows a second embodiment of the drainage pump of the present invention. The structure of the drainage pump of this example is almost the same as that of the first embodiment, and the inner space 4a of the hollow runner shaft 4 communicates with the inside of the pump case by the lower air hole 4b, but further the upper air hole. 4c also communicates with the outside of the pump case. The drive shaft 6a of the motor 6 is inserted and fitted on the upper end of the runner shaft 4. Therefore, when this pump is operating, the air outside the pump case is sucked into the pump case from the upper air hole 4c through the inner space 4a and the lower air hole 4b, and the drain pump of the first embodiment is used. Demonstrate the same function.

(Third Embodiment) FIG. 3 shows a third embodiment of the drainage pump of the present invention. The structure of the drainage pump of this example is also similar to that of the first example, and the internal space 4a of the hollow runner shaft 4 communicates with the inside of the pump case by the lower air hole 4b. A thin drive shaft 6a of the motor 6 is inserted and fitted in the internal space 4a, and a gap 5 is formed between the wall surface of the internal space 4a and the outer surface of the drive shaft 6a. The upper end communicates with the outside of the pump case. Therefore, when this pump is operating, the air outside the pump case is sucked into the pump case through the gap 5, the internal space 4a and the lower air hole 4b, which is the same as the drainage pump of the first embodiment. Demonstrate the function.

[0014]

[Effect of device]

 The drainage pump of the present invention is provided with a hollow runner shaft that penetrates the lid of the pump case in a watertight manner, and introduces external air into the pump case through a bent air passage formed inside the runner shaft. Therefore, even if there is a sudden change in the water level in the pump case, there is an advantage that water does not spout and that the operating noise generated in the pump case does not leak to the outside.

[Brief description of drawings]

1 shows the structure of a first embodiment of a drainage pump of the present invention, (a) is a vertical sectional view thereof, and (b) is a horizontal sectional view taken along the line AA.

2A and 2B show a structure of a second embodiment of the drainage pump of the present invention, wherein FIG. 2A is a vertical sectional view thereof, and FIG. 2B is a horizontal sectional view taken along the line AA.

3A and 3B show the structure of a drainage pump according to a third embodiment of the present invention, wherein FIG. 3A is a longitudinal sectional view thereof, and FIG. 3B is a transverse sectional view taken along line AA.

FIG. 4 is a structural diagram of an example of a conventional drainage pump.

[Explanation of symbols]

 1 Pump Case 1a Suction Port 1b Outlet 2 Lid Part 3 Runner 3a Disk Body 4 Runner Shaft 4a Internal Space 4b Lower Air Hole 4c Upper Air Hole 5 Gap 6 Motor 6a Drive Shaft 6b Internal Space 6c Upper Air Hole 7 Drain Disk

Claims (3)

[Scope of utility model registration request] 1. A hollow shaft of a runner having vanes vertically extending through a lid portion of a substantially conical pump case whose axis is perpendicular to the shaft portion is provided in a watertight and rotatably pierce manner, and an inner portion is provided below the runner shaft. A hollow drive shaft having an air hole for communicating the space with the inside of the pump case and having an air hole for communicating the inner space with the outside of the pump case is fitted in the runner shaft. And drainage pump. 2. A hollow shaft of a runner having blades extending vertically from a lid part of a substantially conical pump case having an axis perpendicular to the cover is provided so as to penetrate in a watertight and rotatably manner, and the inside of a lower part of the runner shaft is provided. An air hole is formed to connect the space to the inside of the pump case, an air hole is formed to connect the inner space to the outside of the pump case at the upper part of the runner shaft, and the drive shaft is fitted to the upper end of the runner shaft. A drainage pump characterized by wearing it. 3. A hollow shaft of a runner having blades extending vertically from a lid part of a substantially conical pump case having an axis perpendicular to the cover is provided in a watertight and rotatably permeable manner, and is internally provided at a lower part of the runner shaft. A drainage pump, characterized in that an air hole is formed to communicate the space with the inside of the pump case, and a drive shaft is fitted between the inner wall of the runner shaft and a gap communicating with the outside of the pump case.