JPH0763188A - Drainage pump - Google Patents

Abstract

PURPOSE:To discharge air mixed in pump water so as to provide self-priming performance and to effectively suppress vibration and noise caused in the pump operation in a drainage pump, in which a centrifugal pump is connected to a screw pump. CONSTITUTION:Inside a cup-shaped casing 1 of a drainage pump, a runner driving shaft boss part 14 fixed in a driving shaft 23 of a motor 22, an approximately disk-shaped runner disk part 8, and a runner 7, which is integrally formed with a spiral blade 11 beneath the runner disk part 8, are stored freely rotationally. The runner disk part 8 is provided with a runner outer circumferential blade 9, in which the runner disk outer circumference upper part is covered by a ceiling plate part 13, and a runner passage 10 connecting the outer circumferential blade 9 and a base part 11' of the spiral blade 11 mutually, and also provided with an air passage 12 connecting the vicinity of the base part of the runner passage 10 and the vicinity of the runner driving shaft boss part 14 in the ceiling plate upper part together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-priming non-displacement type rotary pump for continuously or intermittently discharging drainage generated from, for example, an air conditioner.

[0002]

2. Description of the Related Art As so-called drainage pumps for discharging drainage generated from air conditioners and the like by pumping, for example, (B) No. 3-38476 and (B) No. 4-5.
No. 754, (C) Actual development number 62-74187, (D) Actual development number 63-42890, (E) Actual development number 5-38385.
There are prior arts such as the gazettes that do not have time to list.

In each of these prior arts, a kumadori induction motor, which is durable and has a low price, is used as a drive source. The starting torque of the electric motor is extremely small, and the electric motor is in a shaft-sealing state having the configuration shown in the publication (a) in which the lid of the pump body and the drive shaft boss portion are slidably engaged with each other. , Minute eccentricity during assembly, shock due to external force, vibration during pump operation, distortion of the material of the shaft seal part over time, dust sticking, etc., resulting in inability to start the motor or sliding friction resistance during sliding In any of the techniques disclosed in the publications (b) to (e), a gap is provided between the lid and the drive shaft boss portion because there is a risk of causing a decrease in rotation speed. Further, this gap serves as an air flow passage that communicates with the atmosphere between the suction port side and the outside thereof through the inside of the pump body.

[0004]

However, because of the gap, the liquid overflowing from the gap is prevented from scattering, dust is prevented from entering the gap, or noise generated during pump operation transmitted through the gap. In order to block the above, it was necessary to provide the dustproof and dripproof covers described in the above (B) and (D) publications, or the sound insulation case disclosed in the above (C) publication.

Further, in the prior arts disclosed in the above (d) and (e) publications, the portion of the runner or the cylindrical portion facing the suction port of the rotary blade is a spiral blade and the upper portion is a plurality of blade-shaped runners. The rotary vane, which is disclosed in the above (d) publication, is provided with a dust-proof cover, while the one described in (e) publication is the overflow water from the gap between the drive shaft boss portion and the lid. Although it is described in the summary that scattering and dust protection and especially blocking against the above noises should be minimized, in reality vibrations and accompanying noises are inevitable because the wing-shaped rotary blades hit water. .

As described above, the above-mentioned conventionally known techniques have various problems such as scattering of overflow water, intrusion of dust, generation of noise, and the like, which is uneconomical for preventing and blocking them. It was

Further, in the prior art disclosed in the above (B) publication, the upper parallel portion of the runner is located above the upper edge of the opening communicating with the main body to the discharge port, and there is a swirl present during the pump action. It is said that the water layer blocks the air layer above the pump body to prevent noise and vibration generated inside the pump, but it is intended to suppress the pumping and draining performance from the upper parallel part, which has the largest centrifugal action. Since the pump's capacity and efficiency are lowered, it is unavoidable that the loss is large and uneconomical.

Further, in any of the above-mentioned prior arts, the impact sound of a runner or impeller blade shooting a vortex in water and the vibration simultaneously generated during the pump operation are transmitted to an air conditioner or the like incorporating the pump. It resonates and becomes a vibrating sound that is soft to the ear.

The present invention has been made to solve the problems of the prior art described in detail above, and in particular, it eliminates vibration and noise pollution of the pump and enhances its durability, and at the same time makes it compact and pumps and drains it. It is an object of the present invention to provide a drainage pump which has a higher efficiency and is more economical.

[0010]

In order to solve the above-mentioned problems, the drainage pump according to the present invention is connected to a cylindrical portion that is erected upward in parallel from a suction port at the lower end and has a diameter larger than that of the cylindrical portion. In addition, a main body casing which is formed in a substantially cup shape and has a discharge port in an outer peripheral main portion thereof is provided, and in the main body casing, a runner drive shaft boss portion connected on an extension line coaxial with the drive shaft of the motor, A centrifugal pump is coupled to a screw pump in which a runner integrally formed with a disk-shaped runner desk portion and a spiral blade below the runner is rotatably housed with the tip of the spiral blade facing the inlet. In the drainage pump described above, the runner desk part includes a top plate part, a plurality of runner outer peripheral vanes whose outer peripheral upper part is covered by the top plate part, and the runner outer peripheral vane and the base part of the spiral vane. Together and a runner passage communicating, characterized in that it comprises an air flow passage communicating between the runner driving shaft boss near side of the base portion near the top plate portion the upper part of the runner passage.

[0011]

With the above structure of the present invention, when the motor is started, the runner rotates, and liquid such as drain from the suction port at the bottom of the main body is scooped up by the spiral blade facing the suction port by a screw pump action, A cup-shaped main body casing that rises in the cylindrical portion of the main body and reaches the base portion that is connected to the runner desk of the spiral blade, from there, through the runner flow passage, to the outer peripheral blade or blade of the runner, and that contains the runner desk. The pumping water is discharged by centrifugal force from the discharge port provided in the outer peripheral main part. However, in the case where the pumped liquid is a drain like an air conditioner, the drainage is intermittent because the amount of drainage accumulated in the drain pan is small, and it is a mixture of air.

Even when pumping water by operating a continuous pump, air is mixed in the pumping liquid at the time of initial suction when the pump is started, and this compression and expansion of air is repeated. Therefore, the pumped liquid is not discharged from the discharge port, that is, the self-absorption function of the pump cannot be performed.

Therefore, in order to eliminate this air, an air flow is communicated between the runner flow passage near the base of the spiral blade of the runner desk and the runner drive shaft boss near the runner desk top plate. A passage is provided so that the dissolved air in the pumping liquid in the main body casing of the cylindrical portion and a part of the runner flow passage is provided from the air flow passage to the lid provided on the upper portion of the main body casing of the pump, and the runner drive shaft boss. The gas is discharged to the outside of the pump through the gap with the portion, so that there is no hindrance in the pumping action hindered by the dissolved air, and a smooth pumping action can be performed.

While the pump is in operation, the liquid pumped up from the discharge port by the centrifugal force of the runner and discharged has a discharge pressure. Since it is covered with, the overflow from the top of the pump through the gap between the runner drive shaft boss part and the shaft insertion hole of the lid is the performance of the drain drain pump normally required in the market, that is, the head of 500 m. / m
It was confirmed that there was none even in the case of a lift of more than twice the discharge rate of 0.6 l / min.

While the pump is operating, however, the liquid slightly leached from the outer periphery of the runner desk top plate portion and the upper portion of the runner from the air flow passage forms between the runner desk top plate portion and the lower surface of the lower surface of the lid. A rotating water film is created in the gap or swirling water reservoir. As a result, noise generated when the runner rotates in the main casing of the pump to perform the pump action is shielded from the outside by the water film.

In the case of this pump, the runner desk portion has a plurality of (six in the illustrated embodiment) runner outer peripheral vanes and runner flow passages, but in the case of a blade Compared with the fact that it has a relatively large mass originally, it acts as a flywheel and the vibration due to the impact of water on it, such as in the case of blades, is reduced, and especially the vibration due to the impact is reduced. At the same time, the noise generated at the same time has been greatly reduced.

The rotating water film generated in the swirling water layer reservoir and the internal state during the pump action were easily confirmed by making a body casing of transparent synthetic resin and seeing through. Further, the open end of the runner upper part of the airflow passage of the runner, that is, the open end of the runner desk top plate portion is provided on the outer peripheral side of the runner desk so as to face the inner diameter of the shaft insertion hole of the lid and at least to be removed from the inside. Then, the noise blocking effect during the operation of the pump is enhanced.

However, it should be avoided to bring the opening end closer to the outer peripheral side of the runner than this because the discharge pressure generated in the vicinity of the outer periphery by the centrifugal force of the runner disables the air discharging action.

When the pump is stopped, the pumped liquid flows backward from the discharge port into the casing of the pump body and overflows from the gap between the runner drive shaft boss portion and the shaft insertion hole of the lid to the upper portion of the pump. At this time, the overflow liquid flows out from a gap between the disc-shaped draining plate provided on the drive shaft of the motor and the shaft insertion hole of the lid, and flows out from the overflow discharge port of the annular bank provided on the top of the lid. It flows down to the drain tank and is returned.

At this time, when the pump is restarted before the liquid attached to the draining plate is dried, the liquid is scattered by the centrifugal force due to the rotation of the draining plate. Since the liquid flows out from the overflow outlet and is returned to the drain tank, there is no possibility that the scattered liquid will cause rusting of peripheral equipment or poor electrical insulation.

Further, since the water drain plate covers the shaft insertion hole, it is possible to prevent dust, which is harmful to the pump operation, from entering through the shaft insertion hole.

[0022]

The present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view showing a partial vertical cross section of an embodiment of the present invention, and FIG. 2 is a bottom view of the runner of FIG.

The drive shaft 23 of the motor 22 has a runner drive shaft boss portion
The runner 7, which is coaxially connected with 14, comprises the drive shaft boss portion 14, a substantially disk-shaped runner desk portion 8 and a spiral blade 11 extending downward from a lower base portion 11 ′ thereof. It forms an integral runner with the screw pump.

The main body casing 1 in which the runner 7 is rotatably accommodated is connected to a cylindrical portion 2 which is erected upward in parallel from a suction port 3 at a lower end, is formed in a relatively large diameter and is substantially cup-shaped, and its outer peripheral portion is required. A discharge joint portion 4 having a discharge port 5 is provided.

The runner 7 is rotatably housed in the main body casing 1 together with the spiral blade 11 and the runner desk 8 with the tip of the spiral blade 11 facing the suction port 3.

The lid 16 is attached to the body casing 1 with a lid mounting screw.
The motor 22 is screwed to the lid 16, and the motor 22 is further fixed to the lid 16 by screwing. The lid 16 is provided with a shaft insertion hole 17, into which the runner drive shaft boss portion 14 inserted.
And a gap 17 'between them and the gap 17' also serves as an overflow port for the liquid flowing back from the air port and the discharge side pipe when the pump is stopped.

The drive shaft 23 has a disk-shaped draining plate.
21, which has a gap with the upper portion of the shaft insertion hole and covers it, and further an annular bank 20 surrounding the lower end of the drain plate 21 and the motor 22 is provided on the upper surface of the lid 16, This ring bank
An overflow outlet 19 is provided on the lower side surface of 20.

The lower spiral blade 11 of the runner 7 is a three-threaded spiral as shown, and the spiral blade 11 and the cylindrical portion 2 surrounding the spiral blade 11 constitute a kind of screw pump.

A plurality of runner flow passages 10 are provided on the lower side surface of the runner desk 8 from the base 11 'of the spiral blade 11 which is connected to the runner desk 8, and is formed as a groove of the runner desk 8. And the outer peripheral blades 9 of the runner.

In the case of this embodiment, the outer peripheral blades 9 and the runner flow passages 10 are provided at six places, but this number may be increased or decreased depending on the required flow rate and head. Further, the number of spirals of the spiral blade 11 may be a double-headed screw, and the angle of twist, that is, the length of the lead can be adjusted within a predetermined range.

However, when the above-mentioned runner outer peripheral blades 9 are blades 15a to 15b similar to a volute pump in a general rotary pump (see (a) of FIG. 3), if the number is small, the suction action occurs. There is vibration and noise generated when the sucked air hits the vortex caught in the liquid, and even if the number increases
(See (b) in FIG. 3) The vibration and the accompanying noise are reduced, but they are relatively larger than those in the case of the outer peripheral blade 9.

The runner desk portion 8 is opened from the vicinity of the base portion 11 'of the lower spiral blade 11 to the runner drive shaft boss portion 14 of the upper runner desk top plate portion 13 to open the runner desk portion. A plurality of air flow passages 12 communicating with the flow passages 10 are provided.

The upper portion of the runner outer peripheral blade 9 is covered by the runner desk top plate portion 13. This is because the centrifugal force of the runner 7 during its rotation causes the pressure of the liquid to be pumped out from the discharge port of the main body casing 1 having a cup-shaped upper portion, whereby the gap 17 between the shaft insertion hole 17 of the lid and the runner drive shaft boss portion is The presence of the runner desk top plate portion 13 covering the upper part of the runner outer peripheral blade 9 prevents the jetting of the liquid from ′ ′, and at the same time, the runner desk top plate portion 13 and the air flow passage 12 slightly The liquid that has leached on the upper surface of the top plate portion 13 of the desk forms a rotating water film in the swirling water layer reservoir 6 in the gap between the top plate portion 13 and the underside of the lower surface of the lid 16. The noise due to the pump action is shielded as described in the description of the action column above.

What is disclosed in (a), (b), (c) and (d) of FIG. 3 is another embodiment of the present invention or a modification thereof. As described above, the one shown in FIG. 3A is a blade in which the runner outer peripheral blade 9 in FIG. 1 is inclined at an angle with respect to the radial line.
15a, the number of blades 15b is increased from the number of the above 15a, and FIG. 3 (c) shows the runner desk 8 with its cross section on the vertical axis being reversed. It is formed as a trapezoidal shape or a truncated conical shape with a runner outer peripheral blade provided as a plurality of twist blades 15c on the outer periphery thereof, and FIG. 3 (d) shows the runner outer peripheral blade having an airfoil paddle or blade shape. It is provided as a blade 15d.

In FIGS. 3 (a) to 3 (d), parts having the same reference numerals are the same as those in FIGS. The pumping-up liquid discharging action of these embodiments is the same as that of the drainage pump shown in FIGS.

This runner outer peripheral groove portion 9 or (a) of FIG.
(b), (c), (d) shown in FIGS. 1 and 2, the runner desk top plate portion 13 for covering the upper part of the blades 15a, 15b, 15d has the same effect as described above. Is.

However, when the lift is relatively small, the runner outer peripheral groove portion 9 or the blades 15a and 15b and the blades 15c and 15d of FIGS. 3 (c) and 3 (d), respectively.
In this case, the runner desk top plate portion that covers these upper portions may be omitted. However, in that case, the above-mentioned gap
The discharge amount is reduced by the amount of the liquid overflowing from 17 ', and the surrounding water is unavoidable due to the water droplets scattered by the rotating draining plate 21. Then, the sound of water when the overflowed liquid is discharged and flows down to the drain tank is further added as annoying noise.

On the contrary, during the pump operation, the gap 1
When there is almost no overflow liquid from 7 ', the above-mentioned annular bank 20 may be omitted. In each of the above-described embodiments, the upper surface of the runner desk top plate portion 13 is a flat surface, but a plate-shaped recess may be formed on these upper surfaces.

[0039]

As described in detail above, the drainage pump according to the present invention has the following effects. (A) Since the centrifugal pump is connected to the screw pump, it is a self-pumping liquid discharge type that does not require priming, and the substantially disk-shaped runner desk part has its outer peripheral blade and the base of the spiral blade. Since the communicating runner flow passage has only to have a cross-sectional area sufficient to sufficiently pass the liquid pumped by the spiral blade, it is not necessary to occupy a large intake side space on the axial center side like a general centrifugal pump, Therefore, the mass of the runner desk part is relatively large, and this serves as a traction wheel (flywheel, whisker) at the time of rotation, and at the same time, the liquid between the outer peripheral blades from the axial center side The degree of occurrence of vibrations and accompanying noise due to impact is further reduced, and resonance noise with the pump mounting device is not generated.

Further, since the outer peripheral blades are covered with the runner desk top plate and are integral with each other, the strength is particularly increased when the outer peripheral blades are formed as blades, and the vibration and noise are reduced. (B) The top plate portion covering the upper portions of the outer peripheral blades of the runner desk portion has a drive shaft boss portion and a shaft insertion hole provided in the lid from the upper portion of the runner desk due to the discharge pressure generated by the centrifugal force of rotation of the runner. While the liquid is prevented from overflowing to the outside through the gap, the slightly leached liquid is swirling water phase formed between the runner desk top plate and the lower side of the lid above the top plate. A rotating water film is created in the sump. This water film has the effect of insulating the pump operating noise generated in the main body casing of the pump from the outside. (C) The runner flow passage near the base of the spiral blade of the runner desk and the runner desk driving shaft boss near the top of the runner desk top plate are provided with an air flow passage to communicate with each other intermittently. Even when the suction pumping and discharging are performed and when the continuous pump is operated, the gas such as air mixed in the liquid pumped by the rotation of the spiral blade is discharged from the air flow passage to the outside of the pump when the initial start is performed. The effect of preventing obstruction of the pumping action due to the gas blockage and facilitating the self-pumping action is obtained. (D) Since the water drain plate provided on the motor drive shaft covers the shaft insertion hole and the gap above it with a gap, it prevents dust from falling into the pump casing through the shaft insertion hole. Especially, when the pump is stopped, the liquid that flows back from the pumping liquid discharge pipe overflows and adheres to the upper part of the pump.Therefore, the liquid is scattered at the time of starting the pump, and this splash is blocked by the ring bank provided on the top surface of the lid. As in the case of the overflow liquid, the overflow liquid is provided to the outside of the annular bank and is returned to the drain tank below the pump, for example, from the overflow outlet, so that the overflow liquid or its splashes may be attached to peripheral devices. It helps prevent rust and electrical insulation.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view showing a partial cross section of an embodiment of a drainage pump of the present invention.

FIG. 2 is a bottom view of the runner in the embodiment shown in FIG. 1 of the present invention.

FIG. 3 is an overhead perspective view of another embodiment of the runner in the drainage pump of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body casing 2 Cylindrical part 3 Suction port 5 Discharge port 7 Runner 8 Runner desk part 9 Runner outer peripheral blade formed as an outer peripheral groove part 10 Runner flow passage 11 Spiral blade 11 'Base part 12 Air flow passage 13 Runner desk top plate part 14 Runner Drive shaft boss portions 15a to d Runner outer peripheral blades formed as blades 16 Lid 20 Annular bank 21 Drain plate 22 Motor 23 Drive shaft

Claims (1)

[Claims] 1. A main body casing which is connected to a cylindrical portion which is erected upward in parallel from a suction port at the lower end, has a diameter larger than that of the cylindrical portion, and is formed into a substantially cup shape, and which has a discharge port at an outer peripheral portion thereof. The main body casing is integrally formed with a runner drive shaft boss portion, which is connected to the drive shaft of the motor on an extension line coaxial with the motor, a substantially disk-shaped runner desk portion, and a spiral blade below the runner desk portion. The runner is rotatably housed with the tip of the spiral blade facing the inlet.
In a drainage pump in which a centrifugal pump is combined with a screw pump, the runner desk part includes a top plate part, a plurality of runner outer peripheral vanes whose outer peripheral upper part is covered by the top plate part, and the runner outer peripheral vane and the spiral blade. A runner flow passage communicating with the base of the runner, and an air flow passage communicating between the base of the runner flow passage and the runner drive shaft boss near the top of the top plate. Drainage pump.