JPH10238498A - Volute pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volute pump capable of discharging fluid out of its volute at its stoppage through the opening of a foot valve arranged outside it. SOLUTION: A headrace 17 is defined from a suction port 6a to the inlet 14a of a volute 14 along the lowermost wall part of the volute 14, prior to the arrangement of the port 6a in front of the headarace 17. The port 6a is positioned such that the inner face part A of its lowermost portion lies below the inner face part B defining the lowermost portion of the volute 14. The volute 14 is formed at its lowermost portion with a communicating hole 18 to cause the rear end of the forward headache part 17a to communicate with the volute 14. The inner face part C defining the lowermost portion of the headrace part 17a employs a linear structure from the hole 18 over to the port 6a to thus discharge water inside the volute 14 by way of the hole 18 downward along the wall of the headrace 17a through the port 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized centrifugal pump used for, for example, an apparatus for circulating and filtering hot water in a bathtub.

[0002]

2. Description of the Related Art In recent years, there have appeared devices which allow bath water to pass through a filter or the like to keep the water clean, and washing machines which supply bath water to a washing tub. Many of these devices use a small centrifugal pump installed horizontally.

In these spiral pumps, as shown in FIG. 5, an impeller c is mounted on an output shaft b of a horizontal motor a, and the impeller c is composed of a casing d and a casing cover e. The structure accommodated in f is used.

Normally, this centrifugal pump has a casing structure having a suction port h at a front central portion of a casing d, that is, a portion facing the center of an impeller c, and a discharge port i at an outer peripheral portion. . Then, as the impeller c is driven to rotate by the electric motor a, a liquid, for example, hot water of a bathtub is sucked from a suction pipe j connected to the suction port h, and is filtered from the discharge port i through a filtering device or a washing tub (both shown in the drawing). do not do)
To the discharge pipe k leading to

[0005]

A device for circulating bath water or a washing machine for feeding bath water minimizes the maintenance directly related to the pump in order to minimize the burden on the user. It is desired.

[0006] By the way, the volute pump has a structure in which the volute chamber f is partitioned, and as shown in Fig. 5, finishes the operation and opens the drain hole of the bathtub (by opening the foot valve) to suck the air. Even when the hot water is discharged from the side, the hot water remains on the lower side from the entrance g in the spiral chamber f.

However, the hot water m stored in the spiral chamber f
Is liable to change if left unchecked, and is likely to cause unsanitary conditions. Therefore, as shown in FIG. 5, the vortex pump is provided with a drain hole n for draining water and a drain plug o for plugging the drain hole n in the casing d. It has a structure that can be discharged.

[0008] However, this operation is troublesome and places a heavy burden on the user. Moreover, the work of discharging the remaining hot water
Since it depends on the user, there is a possibility that the remaining hot water may not be discharged when needed, and thus an improvement in such a point is required.

The present invention has been made in view of the above circumstances, and its purpose is to reduce the need for human labor.
An object of the present invention is to provide a volute pump capable of discharging liquid remaining in a volute into the outside through a drain hole outside the pump when the operation of the pump is stopped.

[0010]

According to a first aspect of the present invention, there is provided a swirl pump having a swirl chamber arranged laterally and having an impeller rotatably housed therein, and a swirl chamber. On the front side of the swirl chamber, the inner surface portion of the lowermost portion is provided below the inner surface portion forming the lowermost portion of the volute chamber, and a suction port is provided from the lowermost portion of the volute chamber to the suction port. And a drain channel for introducing the liquid is provided so that the liquid remaining in the swirl chamber is discharged to the outside from the suction port when the operation of the pump is stopped.

That is, according to the centrifugal pump of the first aspect, since the suction port is disposed below the lowermost part of the volute chamber, the drain hole outside the pump (drain of the bathtub etc) is stopped when the operation of the pump is stopped. By opening the hole, the liquid remaining in the volute is discharged from the suction port to the outside through the drainage channel.

In other words, the drain hole that is easy to work without manually touching the pump allows the remaining liquid to be discharged from the swirl chamber to the outside when the operation of the pump is stopped.
As a result, the centrifugal pump does not need to force the user to open the foot valve and open the drain hole of the pump, and is also excellent in sanitation.

According to a second aspect of the present invention, in addition to the above object, in order to realize a discharge structure in which an increase in the number of parts is suppressed, the drainage channel of the first aspect is provided with a headrace from an inlet to an inlet of a spiral chamber. In that it is included in a part of

According to a third aspect of the present invention, in addition to the above object, in order to obtain a headrace having a drainage function with a simpler structure,
A communication in which the headrace of claim 2 is provided along the wall of the lowermost part of the spiral chamber from the middle thereof and the suction port is disposed in the front, and the headrace on the front side is provided at the lowermost part of the spiral chamber. The inside of the spiral chamber is communicated through the hole, and the inner surface of the lower part of the water channel is formed linearly from the communication hole to the suction port.

According to a fourth aspect of the present invention, in addition to the above object, the pump chamber of the third aspect is further provided so that the pump can be installed vertically using a suction port located at a position deviated from the center of the spiral chamber. A pedestal portion, which is located at a position opposite to the side where the suction port is arranged, and in which the pump is placed vertically in cooperation with the suction port.

In addition to the above object, the invention of claim 5 further comprises a spiral chamber for forming a drainage channel at a low cost without requiring complicated processing such as when using a casting. The drainage channel and the water channel are formed integrally with a synthetic resin member.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 shows a fluid,
For example, it is a centrifugal pump (horizontal installation type) installed in a horizontal direction, which is used in an apparatus that uses hot water (liquid) in a bathtub by circulating and filtering.

This centrifugal pump 1 is constructed by providing a pump part 4 made of synthetic resin on an output shaft 3 of a motor 2 arranged horizontally. That is, as shown in FIGS. 2 and 3, the pump section 4 is formed by combining a casing 6 made of synthetic resin, a casing cover 7 and an impeller 8.

More specifically, the casing 6, casing cover 7, and impeller 8, which are the parts of the pump unit 4 that come into contact with water and the parts that come into contact with the electric motor 2, have parts made of an insulating resin member, for example, a PPE member. Is used. The casing 6 has a suction port 6a on the front side and a discharge port 6b on the outer periphery.

The impeller 8 is mounted on the motor 2 by screwing a base 8a inserted at the center of the impeller 8 into the tip of the output shaft 3. Further, the casing 6 and the casing cover 7 which are arranged so as to sandwich the impeller 8 from both sides are provided with a plurality of bolts 9 (in FIG.
(Not shown) is mounted by screwing a boss 10 provided so as to protrude from an outer peripheral portion of the casing 6 and screwing into a receiving base 2b provided on a front portion of the electric motor main body 2a. More specifically, the casing cover 7 is fixed to the electric motor 2 by being sandwiched between the casing 6 and the pedestal 2b, so that bolts for fixing the casing cover 7 are not required. In addition, 12 is a spacer part, 13
Denotes a seal member, and 15 denotes a seal member forming a mechanical seal.

With this structure, the spiral chamber 14 composed of the casing 6 and the casing cover 7 having an all-resin surface is provided.
An impeller 8 made of synthetic resin is accommodated therein. Further, the electric motor 2 and the pump unit 4 are grounded via a resin part.

The synthetic resin pump section 4
In addition, a structure is employed in which hot water remaining in the volute 14 is discharged to the outside from the inlet 6a. This is because the suction port 6a facing the front face is shifted to a position where the inner surface portion A which is the lowermost portion of the suction port 6a is lower than the inner surface portion B which forms the lowermost portion of the spiral chamber 14. The hot water in the spiral chamber 14 is guided from the lowermost part of the spiral chamber 14 to the suction port 6a by the drain passage 16.

In particular, in consideration of not using a separate member for forming the drainage channel 16, a drainage channel 17 extending from the suction port 6 a to an inlet 14 a at the center of the front surface of the spiral chamber 14 is taken into consideration. Utilization, that is, a structure that is included in a part of the water channel 17 is used.

More specifically, as shown in FIGS. 1 and 2, a headrace 17 extending from the inlet 14a to the inlet 6a is
It extends from the middle to the lowermost part of the spiral chamber 14 along the front surface of the casing 6. The water conduit 17 extending to the lowermost part of the spiral chamber 14 extends forward from the point of the lowermost part, and the suction port 6 a is disposed on the front side of the spiral chamber 14. Of course, in the suction port 6a, the inner surface of the lowermost part of the swirl chamber 14 is located below the lowermost part.

A space between the lowermost part of the spiral chamber 14 and the water conduit 17 is communicated with a small-diameter communication hole 18 provided in the front wall of the casing 6, and the hot water in the spiral chamber 14 is supplied to the outside of the spiral chamber through the communication hole 18. That is, it is led out to the headrace portion 17a extending to the front side of the spiral chamber 14.

The inner surface portion C, which is the lowermost portion of the headrace portion 17a, extends from the communication hole 18 to the suction port 6a, and is formed in a substantially straight line so that hot water led out into the headrace portion 17a is sucked. It flows down along the wall surface toward 6a.

With this structure, the drainage channel 1 is connected to the drainage channel 17.
6 functions. It should be noted that the front wall of the casing 6 is located at a portion opposite to the shifted suction port 6a,
The projection 21 forming the pedestal is provided so as to protrude, and the suction port 6a
And in cooperation with the flange 6c provided on the suction port 6a,
As shown in FIG. 4, the whole pump can be placed vertically.

The drainage structure allows the hot water remaining in the swirl chamber 14 to be discharged to the outside without requiring any manpower. That is, when the impeller 8 is rotationally driven by the electric motor 2, the centrifugal pump 1 configured as described above sucks a liquid, for example, hot water of a bathtub, from the suction pipe 19 connected to the suction port 6a and discharges the liquid to the discharge port 6b. To a discharge pipe 20 connected to a filtration device or a washing tub (both not shown).

When the power supply to the motor 2 is stopped,
The rotation of the impeller 8 stops. Then, when the pipe is opened by a foot valve or the like, hot water in the pump section 4 flows out from the suction port 6a.

Here, since the swirl chamber 14 has a separated structure, as shown in FIG. 2B, hot water tends to remain in a region below the inlet 14a. At this time, a small-diameter communication hole 18 is formed in the lowermost part of the spiral chamber 14, and the suction port 6 a is disposed below the lowermost part of the spiral chamber 14,
With the stoppage of the pump operation, the hot water accumulated in the volute 14 is
The water is naturally drawn out from the communication hole 18 to the water guiding portion 17a (outside the spiral chamber) by gravity, and further flows down along the inner surface portion forming the lowermost portion of the water guiding portion 17a, and is discharged from the suction port 6a to the outside. That is, the hot water is returned to the bathtub via the suction pipe 19.

Therefore, when the pump is stopped, the foot valve is opened, and the remaining hot water (from the inside of the volute chamber 14) can be surely removed without the need for laborious drainage work such as when a drain plug is used for the pump. (Remaining liquid) can be discharged to the outside.

Accordingly, the centrifugal pump 1 does not require the user to perform a discharge operation. And no matter how they are used,
Since the hot water is completely discharged from the volute 14 to the outside, it is excellent in sanitation.

In addition, the water conduit 17 extending from the suction port 6a to the inlet 14a of the volute 14 also serves as the drain passage 16.
The number of parts does not increase unnecessarily. In particular, headrace 17
The suction port 6a is disposed in front of the spiral chamber 14 along the lowermost wall portion of the spiral chamber 14 from the middle thereof,
The structure for discharging the hot water remaining in the swirl chamber 14 through “a” only needs to bypass the water conduit 17, so that the structure is simple.

In addition, by providing a projection 21 (pedestal) on the front surface of the casing opposite to the side where the suction port 6a is located, the suction port is shifted as shown in FIG. Utilizing 6a, the entire pump can be placed vertically.

In addition, since the pump portion 4 of the centrifugal pump 1 is entirely formed of a resin member in contact with water, there is no generation of rust and no electric leakage, and high reliability can be obtained. In particular, since a structure is adopted in which the casing cover 7 is attached to the electric motor 2 by bolts so as to be sandwiched between the casing 6 and the electric motor main body 2a, assembly of the pump section 4 can be a simple assembling operation.

In addition, since a swirl chamber 14, a drain passage 16 and a water conduit 17 are integrally formed with the synthetic resin casing 6 and the resin integral structure, a troublesome processing such as when a casting is used is not required. In addition, a drainage structure can be realized at low cost.

In the embodiment, the structure in which the water conduit also serves as the drainage channel is adopted. However, the present invention is not limited to this, and a water channel separate from the water conduit is provided so that water in the spiral chamber is discharged from the suction port. You may.

In one embodiment, a small-sized centrifugal pump used in a device that circulates and filters hot water (liquid) in a bathtub has been described as an example. The present invention may be applied to a small-sized centrifugal pump to be used and other general-purpose centrifugal pumps.

[0039]

As described above, according to the first aspect of the present invention, the liquid remaining in the swirl chamber can be discharged to the outside when the operation of the pump is stopped without requiring any manpower. Therefore, the centrifugal pump does not require the user to perform the discharge operation. In addition, no matter how the liquid is used, the liquid in the spiral chamber can be completely discharged to the outside, which is excellent in hygiene.

According to the invention described in claim 2, according to claim 1
In addition to the effect described above, the structure in which the headrace also serves as the drainage path is employed, so that the number of parts is not increased and the effect that the cost is excellent is exhibited.

According to the invention described in claim 3, according to claim 2
In addition to the effect described above, the structure in which the front surface of the spiral chamber is bypassed can provide a water conduit having a drainage function, and has an effect that the structure is simple.

According to the invention set forth in claim 4, according to claim 3,
In addition to the above effects, the pump can be placed vertically using the suction port located off the center of the swirl chamber, and the swirl pump should be placed in a narrow space when not using it. It has the effect that it can be done.

According to the invention described in claim 5, according to claim 2
In addition to the above-mentioned effects, there is an effect that the drainage channel can be formed at a low cost without the need for complicated processing as when using a casting.

[Brief description of the drawings]

FIG. 1 is a partially cross-sectional side view showing a centrifugal pump installed horizontally according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a pump section of the centrifugal pump.

FIG. 3 is an exploded view for explaining the structure of the pump unit.

FIG. 4 is a view showing a state where a centrifugal pump is placed vertically.

FIG. 5 is a partially sectional side view for explaining a conventional centrifugal pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spiral pump 2 ... Electric motor 4 ... Pump part 6 ... Casing 6a ... Suction port 6b ... Discharge port 7 ... Casing cover 8 ... Impeller 14 ... Spiral chamber 14a ... Entrance of a spiral chamber 16 ... Drainage channel 17 ... Water channel 18 ... Communication hole 21: Projection (pedestal).

Claims (5)

[Claims] A spiral chamber in which an impeller is rotatably accommodated therein, and an inner surface portion of a lowermost portion forms a lowermost portion of the spiral chamber on a front side of the spiral chamber. A centrifugal pump, comprising: a suction port provided below the inner surface portion to be provided; and a drainage channel that guides liquid in the volute chamber from a lowermost portion of the volute chamber to the suction port. . 2. The centrifugal pump according to claim 1, wherein the drainage channel is formed so as to be included in a part of a water channel from the suction port to an inlet of the volute. 3. The water conduit is provided such that the suction port is disposed forward along a wall portion of the lowermost part of the spiral chamber from the middle thereof, and the water conduit on the front side is provided in the spiral chamber. An inner surface portion communicating with the spiral chamber through a communication hole provided at a lowermost portion and forming a lowermost portion of the water conduit portion is formed linearly from the communication hole to the suction port. The centrifugal pump according to claim 2, wherein: 4. The front surface of the volute has a pedestal at a position opposite to the side where the suction port is arranged, for mounting a pump vertically in cooperation with the suction port. The centrifugal pump according to claim 3, wherein: 5. The volute pump according to claim 2, wherein the volute chamber is integrally formed with a synthetic resin member together with the drainage channel and the headrace channel.