JPH0544554Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is particularly useful for improving small drainage pumps that prevent the vibration and noise that occur during the discharge of fluid pumps that discharge condensate generated from air conditioning equipment, etc. Related.

[Conventional technology]

Many conventional technologies are known as drain pumps for air conditioners that are widely used, such as air conditioners including ceiling-embedded type air conditioners for general households and small businesses. For example, Utility Application No. 61-147131, which the applicant proposed earlier.
The drainage pump of No. 1 also has the following configuration as a solution to the problems of the prior art. In other words, in order to eliminate frictional resistance against the motor's starting torque, the empty space of the shaft sealing device is removed, and the lid fitted on the top of the pump body and the shaft are used to vent the inside of the pump body to the atmosphere. It prevents dust from falling into the pump through the gap, and furthermore, part of the drain overflowing from the gap is scattered by the runner shaft, motor drive shaft, and drain plate, and the water droplets are scattered around the motor itself and the surroundings. In order to prevent rust from adhering to the equipment and the occurrence of electrical insulation defects, a dustproof cover was placed between the lid and the motor. An open passage is provided at the top of the lid for releasing air bubbles in the drain and for returning the lid flow of the drain to the drain tank.

In addition, when the amount of drain decreases and air intervenes in the drain, the runner can avoid harsh noises and vibrations caused by hitting the fluctuating spiral waves caused by the divided water mass. It rotates with a uniform load every time, without impact, and eliminates operating noise, and regardless of the amount of drain, it creates a layer of water that fills the water level of the drain so as to close the opening of the outlet inside the main body. In order for the upper edge of the opening to be present, the upper edge of the opening should be horizontally approximately aligned with the large diameter part, which is the base of the inverted triangle connected to the upper parallel part of the runner;
Or at least it is arranged so as to be located below this.

[Problem that the invention attempts to solve]

However, even in this prior art, when the amount of drain discharged is relatively small, that is, the amount of drain generated is small, a thick film is formed above the upper edge of the opening to cover it. The swirling water layer is sucked out toward the drain from the upper edge of the opening, which has a shape that allows it to easily flow out without any resistance, and becomes empty, and this water layer that shields the upper part disappears and flows from there into the main body. Air was often drawn in, causing the harsh noises and vibrations caused by the impact of hitting the runners.

In addition, other conventional technologies in which the discharge port is opened facing the upper parallel part of the runner or the top thereof may have a swirling water layer formed in a thick film above the upper edge of the opening. Since this is impossible, there is no blocking effect, so regardless of the drain flow rate, as the drain flow rate increases and the flow speed increases, outside air is drawn in from the gap between the runner shaft and the lid, causing constant noise. There were also problems with the generation of buzzing due to vibration.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has the structure described in detail below as a means to do so.That is, the main body of the approximately hollow inverted cone meter is directly connected to the drive shaft of the motor and has the axis thereof. It is rotatably housed with a gap between the main body and the small diameter part facing the intake port at the bottom of the main body, and the large diameter part facing the outlet opening provided at the main part of the upper outer periphery of the main body and continuing to the upper parallel part. The pump has a plurality of approximately triangular and vane-shaped runners forming respective parts, the pump having a drip-proof cover between the lid fitted to the upper end of the main body and the motor, so that the pump can be opened from the inside of the main body. an open passage communicating through a gap between the lid and the runner shaft is provided at the top of the lid;
The opening apex of the discharge port inside the main body is located substantially horizontally with the large diameter portion, or at least located below but not exceeding it, and is located below the opening edge including the opening apex. This purpose can be achieved by providing the upper part with a ridge-like embankment that protrudes into the main body.

[Effect]

In the present invention, with the above configuration, the runner rotates together with the motor, and the drain from the suction port at the bottom of the main body increases in circumferential speed from the small diameter portion facing the suction port to the triangular blade portion of the runner. Along with this, the drain is sent upward and reaches the large diameter part, and then it tries to be shaken off in the outer circumferential direction at the upper parallel part connected to this large diameter part, but the drain inside the main body at this part of the maximum circumferential speed is Since the discharge port is not opened there, a thick film-like swirling water layer is formed, thereby blocking the outside air. Drainage is discharged to the outside of the pump from a discharge port having an opening apex.

Even when the water level of the drain tank is low and the amount of drain discharged is small, the upper parallel part of the large diameter part of the runner facing the upper part of the opening edge including the apex of the opening, which has a higher circumferential speed, Due to the rotation, a swirling water layer formed in a thick film shape continues to exist on the upper part of the pump body, and the inside of the pump body is filled with pumped water, and the swirling water layer causes the swirling water layer to form a thick film on the upper part of the pump body. Continue to block outside air.

If the height of the piping on the drainage side of the drain is high, that is, the discharge head is high, the amount of drain decreases.
Even if there is an intermittent backflow from the piping, the swirling water layer blocks the outside air above the pump body as described above.And, there is a rib-like structure that protrudes inside the main body at the upper part of the edge of the opening including the apex of the opening. By providing the bunker, it becomes an obstacle that makes it difficult for the drain forming the swirling water layer to be sucked out in the direction of the drain port, and it also makes it possible to continue the water layer, thereby preventing the upper part of the main body of the pump from being sucked out. Since the pump body is shielded and filled with condensate, the noise and vibrations caused by the runner hitting the fluctuating swirling waves caused by the divided water mass due to the air intervening in the condensate are completely eliminated, and the pump is operated. Block out sound. The above-mentioned swirling water layer that forms a thick film, the state in which the inside of the pump body is filled with condensate, and the state in which condensate is discharged from the runner were confirmed through experiments using a pump body made of transparent synthetic resin. It is something. However, as long as the suction port is in contact with the water surface of the drain tank and the water surface of the discharge side piping does not fall below the apex of the opening, the swirling water layer formed in the thick film shape remains.

When the amount of drain increases and the start-up head of the piping on the discharge side is high, the overflow that cannot be discharged by the pump and when the pump stops, flows back from the piping and cannot be returned from the suction port. The overflow is returned to the drain tank via the open channel. Furthermore, it is necessary to cover the drip-proof cover in order to prevent the overflowing drain from scattering, which can cause rust on motors and peripheral equipment and poor electrical insulation, and to prevent dust from falling and entering from the top. solved by.

〔Example〕

The present invention will be described below with reference to FIG. 1, which is a longitudinal sectional view showing a partial cross section of the embodiment, FIG. This will be explained using a diagram.

In the figure, the drive shaft 18 of the motor 17 has a shaft 9 coaxially with its diameter, and the axes of the shafts 18 and 9 are perpendicular to each other, and the pump body 1 has a substantially hollow inverted conical shape on the extension of the axes. It is rotatably housed with an appropriate gap 11 between the main body 1 and the small diameter portion 6 facing the suction port 2 at the upper part of the main body 1. discharge port 3
A plurality of substantially triangular, blade-shaped runners 10 are provided, each having a large diameter portion 8 facing the opening 5 of the runner and extending to the parallel portion 7 above.

an inverted conical surface 2 formed in two stages inside the main body 1;
3, the opening apex 21 of the opening 5 of the discharge port 3 is arranged so as to substantially coincide with the large diameter portion 8 of the runner 10 in the horizontal direction, or at least to be located below it without exceeding it. It has been set up. Further, an arch-like ridge 20 that protrudes into the main body 1 and covers the upper part of the opening 5 is provided at the upper part of the opening edge 22 including the opening apex 21.

Since the open end surface of this bunker 20 is located at the top of the inverted conical surface 23 formed in two stages, that is, below the maximum diameter portion thereof, the main body 1 may be molded with synthetic resin, or When performing metal die casting, there is no problem in opening and removing the male mold for molding the inside of the main body 1 after molding or casting, and it is easy to pull out. Moreover, the opening 5
It is also possible to easily manufacture a male mold that can be molded or cast with the lower half of the approximately elliptical opening edge 22 intersecting with the inverted conical surface 23 being chamfered. This is the same as in the case of the bunker 20. There is no problem in making the chamfer of substantially the lower half of the opening edge 22 into a curved surface.

Chamfering in this way does not create burrs on the edge of the opening, and therefore makes the deburring process easier.
At the same time, the area of the opening 5 is increased and dust and dirt in the drain can smoothly pass through, thereby preventing so-called dirt clogging.

Although not shown, a lid 12 is fitted onto the upper part of the main body 1 by screwing, and the lid 12 and the shaft 9 are connected together.
It has a gap 13 between. The motor 17 is attached to the lid 12 by screwing. A drainage plate 19 is fitted to the drive shaft 18 in a gap between it and the shaft 9.

A drip-proof cover 14 is placed between the top of the lid 12 and the motor 17, and a groove-shaped open passage 15 communicating with the inside of the pump body 1 through the gap 13 is provided in the top of the lid 12.

A pipe (not shown) is connected to the discharge joint 4 to discharge the drain to the outside.

The suction and discharge actions of the pump, the formation of a swirling water layer on the upper part of the main body 1, and the fact that this thick film-like water layer blocks the outside air, as well as the treatment of drain overflow, etc., are detailed in the section of the above-mentioned action. That's exactly what I did.

[Effect of idea]

As described above in detail, the drainage pump according to the present invention has the following effects.

(a) The apex of the opening of the discharge port inside the main body almost coincides in the horizontal direction with the large diameter part, which is one side perpendicular to the axis of the triangular runner connected to the upper parallel part of the runner, or at least Since it is arranged so as to be located below this, a swirling water layer formed in a thick film shape is always present in the main body where the upper parallel part is located, and the amount of drainage varies Regardless, as long as the water level of the drain blocks the suction port and the water level of the discharge side piping connected to the discharge port does not fall below the position of the apex of the opening, and the pump body is filled with pumped water, The swirling water layer is not drawn into the drainage port due to the obstruction by the bunker provided at the upper part of the opening edge including the opening apex of the discharge port, and the pump is blocked from air with the outside. It completely eliminates the harsh noises and vibrations caused by impact caused by air entering the pump, and also blocks the operating noise of the pump.
Furthermore, since there is no impact, the runner and motor
It rotates with a uniform load each time it rotates, increasing durability.

(b) Since the edge of the opening of the discharge port is chamfered to facilitate molding, deburring work can be omitted, the opening area of the opening can be expanded, and
To prevent blockage caused by so-called garbage clogging due to accumulation of dust and dirt in a drain and to facilitate its passage.

(c) Since a drip-proof cover is placed between the lid fitted to the top of the pump body and the motor, water can be leaked from the open passage provided at the top of the lid through the gap between the lid and the runner shaft. The overflow of condensate returned to the drain tank prevents water droplets that are scattered by the rotation of the runner shaft, motor drive shaft, and drain plate from reaching the outside, and prevents rusting and electrical insulation resistance of the motor and surrounding equipment due to the water droplets. prevent deterioration.

(d) Covering with the drip-proof cover provides an empty space in the sealing device to eliminate frictional resistance to the starting torque of the motor, and the lid and runner to open the inside of the pump to the atmosphere. Dust can be prevented from falling into the pump through the gap between the pump and the shaft.

(e) By providing the open passage, it can be used as a passage for discharging air bubbles in the drain and disposing of overflow by returning a portion of the drain to the drain tank.

The drainage pump of the present invention, which has the advantages described in detail above, has great utility value for drain discharge from air conditioners and the like.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a partial cross section of an embodiment of the present invention, Fig. 2 is a plan view of the main body and runner in Fig. 1 excluding the lid and motor, and Fig. 3 is a plan view of the main body. FIG. 1...Body, 2...Intake port, 3...Outlet port, 5
...Opening part, 6...Small diameter part, 7...Upper parallel part, 8
...Large diameter section, 9...Shaft, 10...Runner, 11...
... Gap, 12 ... Lid, 13 ... Gap, 14 ... Drip-proof cover, 15 ... Open path, 20 ... Embankment, 21
...Aperture apex, 22...Aperture edge.

Claims (1)

[Scope of utility model registration request] The main body is directly connected to the drive shaft of the motor and is rotatably housed in a substantially hollow inverted conical shape with the axis perpendicular to the main body with a gap therebetween. A pump having a plurality of approximately triangular and vane-shaped runners each forming a large-diameter portion facing an opening of a discharge port provided in a main part of an upper outer periphery and continuing to an upper parallel portion, the runner being fitted into the upper end of the main body. A drip-proof cover is placed between the lid and the motor, and an open passage communicating from the inside of the main body through a gap between the lid and the shaft of the runner is provided in the upper part of the lid, and a discharge port inside the main body is provided. The apex of the opening is located below the large diameter portion, which is substantially aligned with the large diameter portion in the horizontal direction, or at least does not exceed this, and there is a protrusion inside the main body at the upper part of the edge of the opening including the apex of the opening. A drainage pump characterized by being equipped with a wall-shaped bund.