JP2001123977A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises of operating sound in a drainage pump. SOLUTION: A plurality of vane members 22 extending toward the axial core of a shaft part 21 and having the inner ends separated from the shaft part 21 are attached inside a drain guide member 25A, a plate-shaped auxiliary vane 29 is axially attached to the lower part of the shaft part 21, and the lower ends of respective vane members 22 are connected by a doughnut-shaped drain guide plate to form the drain guide surface 24 having a hollow part between it and the auxiliary vane 29. Therefore, the free front surface formed of a pump main body is restrained from being disturbed by the vane members 22, generation of bubbles is reduced, and noise and vibration can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pump, and more particularly to a drainage drainage pump suitable for draining drainage formed on the surface of a heat exchanger of an indoor unit of an air conditioner.

[0002]

2. Description of the Related Art During the cooling operation of an air conditioner, a large amount of dew is generated on the surface of the heat exchanger of the indoor unit due to cooling of the air. Therefore, in general, a drain pan for collecting drain is provided at the bottom of the air conditioner, and a drain pump is attached to the drain pan, and the drain pump is appropriately operated to drain the drain outside the machine or outside the room. Various types of drain pumps are used for this purpose.

FIG. 20 and FIG. 21A show an example of such a drain drain pump.
This drain drain pump has a pump body 100 and a cover 200 that covers the upper part of the pump body 100. The pump body 100 has a pump chamber 120 formed by a cylindrical housing 110, and a lower part in the center of the pump chamber 120. The pump includes a suction pipe 140 that forms the provided suction port 150 and a discharge pipe 160 that forms a discharge port 170 extending horizontally from the pump chamber 120. Further, a motor (not shown) is mounted on an upper portion of the cover 200, and a shaft portion 210 and a shaft portion 210 having an insertion hole formed at an upper end portion for receiving an output shaft of the motor. A plurality of large-diameter blades 220 provided in a radial direction from
Wall member 260 and large-diameter blade 22 provided on the outer peripheral edge of
0, a donut-shaped disk 250 having a hollow portion 255 provided at the lower edge, and a small-diameter blade 230 protruding below the donut-shaped disk 250. This large diameter blade 220
Is disposed in the pump chamber 120, and the small-diameter blade 230 is disposed in the suction pipe 140. As shown in FIG. 22 (b), the plate-shaped large-diameter blade 220 provided in the radial direction from the shaft portion 210 extends in the axial direction of the shaft portion 210, and the inner end portion extends from the shaft portion. A plurality of spaced apart blade members 261 are attached.

[0004] When the small-diameter blade 230 rotates in the suction pipe 140, the drain of a drain pan (not shown) in contact with the bottom opening of the suction pipe 140 of the pump body is sucked and sucked into the pump chamber 120. The centrifugal force of the diameter blade 220 stirs the drain while forming a free surface on the surface of the drain water by the atmospheric pressure supplied from the upper central portion, and converts the velocity energy of the drain water into pressure energy to form on the outer periphery of the pump body 100 The drain port 170 is configured to discharge drain water.

In this type of drain pump, the large-diameter blade 22
0, when the drain water is discharged from the discharge port 170, the rising liquid level is divided almost vertically by the disk 250, and the liquid surface is partially blocked so that the flow is restricted, and the liquid in contact with the large-diameter blade 220 Will be ejected.

[0006]

In the above-mentioned conventional drain drain pump, the drain water is stirred by high-speed rotating blades to apply speed energy to the drain water by its centrifugal force and to introduce atmospheric pressure to the center part. Will be stirred by the blades in a state of being mixed with air. In particular, when starting this drain drain pump, a large amount of air is mixed with a small amount of drain water that is sucked up, and since the free surface is near the outer periphery of the main wing, the drain water is violently stirred inside the pump body, Here, a local pressure drop occurs, generating bubbles near the outer edge of the blade.
That is, as shown in FIG. 21, a bubble G2 is generated around the large-diameter blade 220, and the bubble collides with the large-diameter blade 220 and the inner wall of the pump main body 100. As a result, noise is generated, Since the free surface is disturbed, there is a problem that vibration increases.

In particular, with the improvement of the living environment of houses and offices in recent years, the operating noise of air conditioners has been reduced, and the operating noise of drain pumps used in air conditioners has been improved.
In recent years, air conditioners have been reduced in size and vortex, and the degree of freedom in construction has been emphasized in addition to improving the performance of air conditioners. As a result, the performance required of the drain pump is required to be higher and the operation noise is lower.
In other words, in order to improve the workability of the air conditioner, it is necessary to increase the head. In addition, when the air is drained directly from the drain outlet of the air conditioner to the outside of the machine, a lower head is also required. It is also necessary.

The present invention is intended to solve such a problem. An impeller rotatably disposed in a pump body includes a shaft portion connected to an output shaft of a motor, A ring-shaped member disposed at a constant radius from the rotation axis of the rotor, a plurality of blade members extending in the axial direction of the shaft portion inside the ring-shaped member, and an axial direction below the shaft portion. In a drain drain pump attached with plate-shaped auxiliary blades along, the free surface formed in the pump body is suppressed from being disturbed by the blade members, and the surface of the blade members in contact with the fluid is compared with the conventional one. It is an object of the present invention to provide a low-noise, low-vibration drain drain pump by reducing the size.

[0009]

SUMMARY OF THE INVENTION The present invention, in order to solve the above-mentioned problems, has a configuration as described in the claims.

In the present invention, since the blade member is provided inside the ring-shaped member provided at a distance from the shaft portion, the free surface formed in the pump body is prevented from being disturbed by the blade member. . In addition, since the surface of the blade member that contacts the fluid becomes smaller, the load can be reduced.

The plurality of blade members extend inside the ring-shaped member in the direction of the axis of the rotating shaft, and the distal ends thereof are attached away from the shaft portion.
By connecting the lower end of each blade member, and forming a hollow portion between the axially extending plate-shaped auxiliary blade attached below the shaft portion, the free surface is suppressed from being disturbed by the blade member, As a result, generation of bubbles is reduced, and noise and vibration can be reduced. In addition, the load can be reduced by this, and when the lift (head) is the same, the motor can be downsized.

Further, the guide surface formed on the upper surface of the drain water guide member makes it possible to smoothly drain the drain water which is going to move upward in the pump chamber, and to secure a sufficient pump capacity.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention. FIG.
FIG. 3 is a plan view of the impeller, and FIG. 3 is a vertical sectional view of the impeller. A pump body 2 having a pump chamber 1 having an inner surface having a substantially hollow inverted conical shape has a suction port 3 at a lower end and a discharge port at an upper side. An outlet 4 is provided, and the outlet 4 is connected to a discharge pipe 5. A lid 8 is fixed to the upper opening of the pump body 2 via an O-ring 6 with a set screw (not shown). A drain portion 9 is formed at the center of the lid 8, an opening 10 is provided at an upper central portion of the drain portion 9, and a drain surface portion 11 whose inner surface is bent downward is provided at a lower end portion of the opening 10. ing.

A motor 13 is fixed to a column 12 protruding from the upper surface of the lid 8, and a rotating shaft 14 of the motor 13 projects downward and penetrates through the opening 10 of the lid 8. When the motor 13 is driven, the rotating shaft 1 is fixed.
The impeller 20 rotates in the pump chamber 1 via 4. A drain plate 15 is attached above the opening 10 of the rotating shaft 14, and the return water in the drain hose when the pump is stopped rises from above the impeller along the outer periphery of the rotating shaft 14, and the drain water enters the motor. Is preventing that.

As shown in FIGS. 2 and 3, the impeller 20 is provided with a shaft portion 21 connected to the rotating shaft 14 of the motor 13, and at a constant radius from the shaft portion 21. A ring-shaped drain water guide member 25 is provided. A hole 21 a into which the lower end of the rotating shaft 14 can be fitted is formed at the top end of the shaft portion 21.

On the upper surface of the drain water guide member 25A, the impeller 2 of the blade member 22 (details will be described later) is provided.
In the illustrated example, eight guide surfaces 28 are provided, which are continuously inclined upward from a vertical surface 26 opposite to the rotation direction 0 to a vertical surface 27 in the rotation direction of the impeller of the adjacent blade member 22. ing. As a result, the drain water guide portion 25 separates the adjacent blade members 22 from the vertical surfaces 26 and 27 and the vertical surface 26 on the opposite side to the rotation direction of the impeller 20.
At a vertical plane 27 in the rotation direction of the impeller.
Further, a guide surface portion which is inclined downward in the rotation direction of the impeller 20 is formed. Furthermore, the drain water guide 2
5 and 1 below the shaft portion 21 along the axial direction.
A plate-like substantially rectangular auxiliary blade 29 is attached.

Here, the blade member 22 is disposed apart from the shaft portion 21. That is, a plurality of blade members 22 are attached to the inside of the ring-shaped drain water guide member 25A and extend in the axial direction of the shaft portion 21 and have an inner end located away from the shaft portion 21. ing. Further, one plate-like substantially rectangular auxiliary blade 29 is attached below the shaft portion 21 along the axial direction.

The lower ends of the plurality of blade members 22 are connected by a donut-shaped drain guide plate having a substantially inverted conical shape as a whole to form a drain guide surface 24. A hollow portion 23 is formed between the blade and the blade 29. The inner edge of the drain guide surface 24 is supported by the auxiliary blade 29. The bottom surface of the pump chamber 1 is also formed in an inverted conical shape substantially similar to the drain guide surface 24.

The impeller 20 having the above structure is used for the pump chamber 1.
When the drain water of the drain pan has accumulated from the suction port 3 at the lower end of the pump chamber 1 to the upper side, the drain is stirred by the rotation of the auxiliary blade 29 of the impeller 20 and centrifugal force is applied. It rises along the inverted conical inner surface of the pump chamber 1. At this time, atmospheric pressure is introduced into the pump chamber 1 from the opening 10 above the center of the lid 8, so that the drain water in the pump chamber has a free surface whose center forms a substantially paraboloid.

The drain water stirred by the auxiliary blade 29 and rising along the inner surface of the pump chamber 1 is supplied to the auxiliary blade 2
The drain on the lower surface of the drain water guide portion 25 formed above the upper surface 9 further rises along the inner surface of the pump chamber 1 while being guided by the side surface 24, and the space between the drain water guide portion 25 and the inner wall of the pump chamber 1 To rise. As a result, the drain water is stirred at high speed by the blade member 22, and a large velocity energy is given to the drain water.

As a result, the drain water reliably forms the above-mentioned substantially parabolic free surface, and its velocity energy is converted into pressure energy which presses the inner wall surface of the pump chamber 1.
The drain water is discharged from the upper side through the discharge port 4 to the outside through the discharge pipe 5. At this time, the drain water further flows into the inclined surface (guide surface) 2 formed on the upper surface of the drain water guide portion 25.
8, the drain water is guided to the blade member 22,
The free surface formed in the pump chamber 1 is stable.

Further, at the time of start-up, air bubbles generated on the outer peripheral surface of the drain water guide portion 25 are also guided by the drain water guide portion 25 into the blade member 22, so that air bubbles on the outer peripheral surface of the drain water guide portion 25 are formed. Generation and collapse can be suppressed, and noise at the time of starting the pump can be reduced.

Further, a large centrifugal force is applied to the blade member 22 by the drain water guide portion, so that drain water which is going to move upward in the pump chamber 1 is smoothly drained, and a sufficient pump capacity is secured. It becomes possible. Furthermore, since the operation of the drain pump is smooth, the pulsation of the discharge pressure during the pumping operation is reduced, and the vibration due to the pulsation is also reduced.

Further, in this embodiment, the plurality of blade members 22 are formed as ring-shaped drain water guide members 25A.
Inside of the shaft portion 21, extends in the axial direction of the shaft portion 21, their respective tips are attached away from the shaft portion 21, and the lower end portions of the blade members 22 are connected to each other to form the shaft portion 21. Since the hollow part 23 is formed between the lower part and the plate-shaped auxiliary blade 29 along the axial direction, the free surface formed by the pump body 1 is
2, the occurrence of bubbles is reduced and noise and vibration can be reduced. In addition, the load can be reduced and the motor can be downsized when the head is the same.

Further, a large centrifugal force can be applied to the blade member 22 by the inclined surface (guide surface) 25 formed on the upper surface of the drain water guide member 25A. It is possible to drain the drain water smoothly and to secure a sufficient pump capacity. In particular, since the plurality of blade members 22 are attached such that their respective inner ends are located at a fixed distance from the shaft portion 21, it is possible to suppress the blade members 22 from disturbing the free surface. As a result, generation of bubbles can be reduced, and noise and vibration can be reduced. Further, since the surface of the blade member 22 that contacts the fluid (drain) is smaller than that of the conventional one, the load is reduced.

The operation and effect as described above are obtained by applying the voltage AC200
Under the condition of V, the drain drain pump shown in FIG.
R-33H, manufactured by Rion Co., Ltd., and the microphone is positioned 50 cm from the upper surface S of the stator, and the sound level meter (N
A-29, manufactured by Rion Co., Ltd.), the results were measured by changing the head, and the results were compared with those shown in FIGS.
Experimental result data as shown in FIGS. 13 to 16 were obtained. As is clear from these figures, the drain drain pump of the present invention has improved noise at all heads as compared with the conventional one.

Further, as a result of comparing the structure of the drain water guide portion of the present invention with the structure shown in FIG. 21B by experiment, experimental result data as shown in FIG. 17 was obtained. As is evident from FIG. 17, the drain drain pump of the present invention is improved in head in comparison with the conventional one.

Next, a second embodiment will be described with reference to FIGS. FIG. 4 is a side view showing the entire structure in partial cross section, FIG. 5 is a plan view of the impeller, and FIG. 6 is a vertical cross sectional view of the impeller. The difference is that the bottom surface of the pump body 1 is formed with an inclined surface 1a which descends inward in the first embodiment, whereas the bottom surface of the pump body 1 is substantially horizontal in the second embodiment. It is a point that has been formed. There are no other structural differences.

In the second embodiment, due to this difference in configuration, in addition to the above-described effects of the first embodiment, the manufacture of the pump body 1 is easier than that of the first embodiment. It has the effect of becoming.

Further, a third embodiment will be described with reference to FIGS. 7 is a side view showing the whole partly in cross section, FIG. 8 is a plan view of the impeller, and FIG. 9 is a vertical cross section of the impeller. The difference is that the plate-shaped auxiliary blade 29 is formed in an inverted triangular shape whose width becomes narrower downward in the plane, and the portion of the pump body 1 that faces the (triangular) auxiliary blade 29 is also triangular. The point is that it is formed on the conical body 1 c having a lower constriction corresponding to the auxiliary blade 29. There are no other structural differences.

In the third embodiment, in addition to the above-described effects of the first embodiment, the auxiliary blades 29 are formed in a triangular shape whose plane is narrower downward, so that the auxiliary blades 29 are formed. The centrifugal force acting on the drain water that rises along the inner surface of the pump chamber 1 due to the rotation of the blades 29 gradually increases as the drain water rises, and the effect of increasing the discharge capacity of the pump is achieved.

Next, a fourth embodiment will be described with reference to FIGS. FIG. 10 is a plan view of the impeller, and FIG. 11 is a vertical sectional view of the impeller. The fourth embodiment differs from the first embodiment in that a drain water guide member having a ring shape is provided with drain water. The point is that a guide portion (a member indicated by reference numeral 25 in FIG. 1) is not formed. There are no other structural differences.

With such a configuration, in the fourth embodiment, the discharge capacity of the pump is reduced because the operation and effect of the large centrifugal force being applied to the blade member 22 by the drain water guide portion are not exhibited. Although the operation is slightly reduced, the operation of forming the inclined surface and the like can be omitted, in addition to the above-described operation and effect of the first embodiment, the effect of reducing the manufacturing cost can be obtained, and the drain water guide member 25
The pressure inside A becomes large, the free surface formed by the pump body 1 becomes small, and the portion disturbed by the blade member 22 also becomes small, so that the effect of suppressing noise can be obtained.

The present invention can be variously modified in addition to the above embodiment. For example, as shown in FIG.
The auxiliary blade 29 may be constituted by a vertical line portion 291 and a curved portion 292, and the curved portion 292 may be connected to the blade member 22. As a result, the drain rising on the pump chamber wall surface is gradually applied with a large centrifugal force when it comes into contact with the curved portion 292, so that noise at the beginning of suction can be suppressed, and the discharge water level can also be reduced. Although the width of the auxiliary blade is constant, the force for pumping out the drain water is also constant, and when the drain water level rises, the drain water is sucked up and brought into contact with the impeller, so that a large centrifugal force is applied to the drain water, and the discharge port is discharged. Is more discharged,
Drainage operation can be performed at a lower water level than when the discharge water level is higher.

Further, as shown in FIG.
By increasing the opening angle A ° of the pump chamber to the opening angle B ° of the bottom of the pump chamber, the flow path of the drain return water when the pump is stopped can be expanded, and the air can be smoothly drained into the drain pan. And the like, can reduce noise.

The gaps D and E between the inner wall of the pump body and the impeller affect the operation noise. The smaller the gaps D and E are, the smaller the noise is. In particular, at the time of the low head operation, the free surface is not formed near the outer periphery of the pump chamber due to the centrifugal force, and the noise caused by the generation and collapse of bubbles due to the stirring of the outer edge of the blade member can be reduced.
However, it is necessary to set this gap in consideration of productivity and the like.

FIGS. 18 and 19 are graphs showing the relationship between the operation noise and the noise level when the gap E is changed.

From these, the gap between the inner wall of the pump body and the impeller is 3 mm or less, preferably 1.5 mm to 2.0 m.
m.

[0039]

As described in detail above, according to the present invention,
The following effects can be obtained. (1) The drain water is smoothly guided to the blade member by the drain guide surface formed on the lower surface of the drain water guide portion and the guide surface formed on the upper surface, and is prevented from being rapidly stirred. As a result, generation of air bubbles is suppressed particularly at the time of starting, and generation of noise is prevented.
In addition, a large centrifugal force is given to the blade member by the guide surface formed on the upper surface of the drain water guide portion,
Drain water that is going to move upward in the pump chamber is also smoothly drained, and it is possible to ensure sufficient pumping capacity. (2) Since the operation of the drain drain pump is smooth, the pulsation of the discharge pressure during the pumping operation is reduced, and the vibration due to the pulsation can be reduced. (3) By providing the blade member inside the ring-shaped member provided at an interval from the shaft portion, the free surface formed in the pump body is prevented from being disturbed by the blade member. In addition, since the surface of the blade member that contacts the fluid becomes smaller, the load can be reduced. (4) In addition, the plurality of blade members extend inside the ring-shaped member in the axial direction of the rotation shaft, and the distal ends are attached away from the shaft portion. A hollow portion is formed between the plate-shaped auxiliary blades attached below the shaft portion along the axial direction by being connected by a donut-shaped drain guide surface, so that the free surface formed by the pump body 1 is reduced. Disturbance by the blade member is suppressed, and as a result, generation of bubbles is reduced, and noise and vibration can be reduced. In addition, the load can be reduced by this, and when the lift (head) is the same, the motor can be downsized. (5) Since the shape of the auxiliary blade has a curved portion whose width gradually increases, if the drain water is sucked up to the curved portion, a centrifugal force is applied, and the drain water is sucked upward and is discharged from the discharge port. The drainage operation can be performed at a lower water level than the one that is discharged and the width of the auxiliary blade is constant.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire drain drain pump as a first embodiment of the present invention in a partial cross section.

FIG. 2 is a plan view of the impeller.

FIG. 3 is a vertical sectional view of the impeller.

FIG. 4 is a side view showing the entire drain drain pump as a second embodiment of the present invention in a partial cross section.

FIG. 5 is a plan view of the impeller.

FIG. 6 is a vertical sectional view of the impeller.

FIG. 7 is a side view showing the entire drain drain pump as a third embodiment of the present invention in a partial cross section.

FIG. 8 is a plan view of the impeller.

FIG. 9 is a vertical sectional view of the impeller.

FIG. 10 is a plan view of an impeller of a drain drain pump according to a fourth embodiment of the present invention.

FIG. 11 is a side view of the impeller.

FIG. 12 is a side view of a drain drain pump as an embodiment of the present invention.

FIG. 13 is a graph of 50 Hz during drain operation showing the relationship between the head and noise of the drain drain pump as the first embodiment of the present invention and the conventional product.

FIG. 14 is a graph at 60 Hz during the drain operation.

FIG. 15 is a graph of 50 Hz at the same stability.

FIG. 16 is a graph at 60 Hz at the same stable time.

FIG. 17 is a comparison diagram of the head of a drainage pump as another embodiment of the present invention and a conventional product.

FIG. 18 is a graph showing a relationship between noise and a gap between an inner wall of a pump main body and an impeller of a drain drain pump as an embodiment of the present invention.

FIG. 19 is a graph showing a relationship between noise and a gap between an inner wall of the pump body and the impeller.

FIG. 20 is a cross-sectional view showing a part of a conventional drain drain pump.

21A is a plan view of the impeller, and FIG. 21B is a plan view of another impeller.

[Explanation of symbols]

 Reference Signs List 1 pump chamber 2 pump body 3 suction port 4 discharge port 5 discharge pipe 8 lid 10 opening 11 draining surface portion 13 motor 14 rotating shaft 15 draining plate 20 impeller 21 shaft portion 22 blade member 23 hollow portion (gap) 24 drain guide surface ( 25 Inverted conical surface 25 Drain water guide portion 25A Ring-shaped drain water guide member 26 Vertical surface 27 Vertical surface 28 Inclined surface (guide surface) 29 Auxiliary blade

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Katsuya Taguchi, 535 Sasai, Sayama-shi, Saitama Pref. Inside the Saginomiya Works Sayama Works (72) Inventor Masahiko Yoshida 535 Sasai, Sayama-shi, Saitama Pref. Sagimiya Works, Sayama Works F Terms (reference) 3H033 AA01 AA18 BB01 BB06 BB16 CC01 DD02 DD21 EE06 EE08 3L050 BC04 BF02

Claims (3)

[Claims] A pump body having a suction port formed at a lower end thereof and a discharge port formed at an upper side surface; an impeller rotatably disposed in the pump body; and a motor for rotating the impeller. The impeller comprises: a shaft portion connected to an output shaft of the motor; and a ring-shaped drain water guide member disposed at a constant radius from a rotation axis of the motor. And an inclined surface forming a plurality of drain water guide portions formed at intervals in the drain water guide member. The drain water guide member extends in the axial direction of the shaft portion inside the drain water guide member. A plurality of blade members whose ends are located apart from the shaft portion are attached,
A plate-shaped auxiliary blade is attached below the shaft portion along the axial direction, and a lower end portion of each of the blade members is connected, and a second drain guide surface having a hollow portion with the auxiliary blade is provided. A drain drain pump characterized by being formed. 2. The pump body according to claim 1, wherein the bottom surface of the pump body is formed as an inclined surface that becomes lower toward the center, and the auxiliary blade is formed in an inverted triangular shape whose width becomes larger as it goes upward. The drain drain pump as described. 3. A pump body having a suction port formed at a lower end portion and a discharge port formed at an upper side surface, an impeller rotatably disposed in the pump body, and a motor for rotating the impeller. An impeller having a shaft portion connected to an output shaft of the motor, and a ring-shaped member disposed at a constant radius from a rotation axis of the motor. Inside the ring-shaped material, a plurality of blade members extending toward the axial direction of the shaft portion and having an inner end located away from the shaft portion are attached, and below the shaft portion, along the axial direction. A drain drain pump, wherein a plate-shaped auxiliary blade is attached, and a lower end portion of each of the blade members is connected to form a drain guide surface having a hollow portion with the auxiliary blade.