JP2940584B2 - Self-priming pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a self-priming pump.
In particular, the present invention relates to a self-priming pump in which, for example, water discharged from a pump chamber outlet into an air / water separation chamber is returned to an inlet of the pump chamber through a return hole, thereby having a self-priming function.

[0002]

2. Description of the Related Art An example of this type of self-priming pump is disclosed in, for example, JP-A-59-103879. In this prior art, a plunger is attached to an opening of a return water passage (recirculation hole) on an air separation chamber (air / water separation chamber) side to automatically open and close the return water passage.

[0003]

In the above-mentioned prior art,
The plunger is used to open and close the return water channel (return hole). However, there is a problem in that the plunger is liable to be clogged with contaminants and cannot exhibit stable self-priming performance. In addition, the water passage during pumping operation is rapidly expanded (pump room →
Since the air separation chamber is rapidly reduced (air separation chamber → discharge port), the pressure loss is large and the pump performance is poor.

[0004] Therefore, a main object of the present invention is to provide a self-priming pump capable of exhibiting stable self-priming performance and improving pump performance.

[0005]

SUMMARY OF THE INVENTION The present invention provides an inlet and an outlet.
First casing including a pump chamber having:
A second housing provided above the housing and including a steam-water separation chamber.
Sing, a suction port provided on the upper surface of the second casing and
Separator, which separates the pump chamber from the steam-water separation chamber
Provided at a position facing the discharge port of the release plate, discharge from the outlet
Inlet for taking water into the steam separation chamber, steam separation
Extending vertically between the inlet and the outlet in the room
Rectifying plate to be arranged, steam-water separation chamber provided on separation plate
The return hole for returning the water inside the pump chamber and the steam-water separation chamber
A self-priming pump provided with a water passage communicating the suction port and the inlet .

[0006]

The suction port and the discharge port are provided on the upper surface of the second casing.
The suction-side pipe and the discharge-side pipe are the same.
Piping. During the self-priming operation, the air discharged from the pump chamber outlet through the inlet to the air / water separation chamber is discharged from the outlet, and the water is returned to the pump chamber through the return hole. During the pumping operation, the pump passes through the water passage from the suction port.
Water taken into the room passes through the intake to the steam-water separation chamber
Released is directly discharged from a discharge port provided at a position facing the inlet is guided by the rectification plate.

[0007]

According to the present invention, the pressure loss during the pumping operation can be reduced, and the pump performance can be improved. Further, since sufficient pump performance can be obtained without closing the return hole, there is no need to provide a plunger in the return hole, and stable self-priming performance can be exhibited. Further, the air discharged from the intake during the self-priming operation can be smoothly discharged from the discharge port by the flow regulating plate provided at the discharge port, so that the water-water separation performance can be improved, and the self-priming performance can be improved. In addition, suction
Side pipe and discharge side pipe in the same direction.
Thus, the piping space can be reduced.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a self-priming pump 10 of this embodiment has a first casing 12, a second casing 14, and a separation plate interposed between the first casing 12 and the second casing 14. 16 inclusive. A pump chamber 18 is formed inside the first casing 12, and an impeller 20 connected to a rotating shaft of a motor (not shown) is housed in the pump chamber 18. Also, the center of the upper surface of the pump chamber 18 (separation plate 16
(Central portion of the pump chamber), a pump chamber inlet 22 is formed, and a pump chamber outlet 24 is formed at a peripheral portion of the pump chamber 18.

A pump chamber outlet 24 is provided at the periphery of the separation plate 16.
An inlet 26 is formed which communicates with the inlet. Also, the separation plate 16
Around the periphery of the pump chamber 18 and a steam-water separation chamber 30 described later.
And at least one return hole 32 communicating with. Inside the second casing 14, a steam-water separation chamber 30 is formed. A suction port 34 is formed at the center of the upper surface of the steam separation chamber 30, and a connection portion 36 that protrudes upward from the suction port 34 and connects the suction side pipeline is formed. Then, the suction port 34 and the pump chamber inlet 22 is set to the steam-water separator chamber 30
It is communicated via a cylindrical portion 38 as a cut water passage . Further, a discharge port 42 is formed at a position on the peripheral edge of the upper surface of the water / water separation chamber 30 that faces the intake port 26, and a connection section 44 that protrudes upward from the discharge port 42 and connects the discharge side pipeline is formed. It is formed. And in the steam-water separation chamber 30
A rectifying plate 48 (see FIG.
1, FIG. 2) is provided extending vertically. Current plate 48
Is set according to the pump performance and the like so that a sufficient steam-water separation effect can be obtained. The current plate 48 may be formed integrally with the second casing 14.

[0011] In operation, when to rotate the impeller 20 by a motor (not shown), water and air are mixed in the pump chamber 18, the mixed water and air steam separator through the inlet 26 taken from the pump chamber outlet 24 Released into the chamber 30.
Then, the air discharged into the steam separation chamber 30 is rectified by the rectifying plate 48, and is smoothly discharged as it is.
Is discharged from On the other hand, the water discharged into the steam separation chamber 30 is returned to the pump chamber 18 through the return hole 32. The water returned to the pump chamber 18 is mixed with the air again, and discharged from the pump chamber outlet 24 through the inlet 26 into the steam-water separation chamber 30. While such an operation is repeated, water starts to be sucked in from the suction port 34, the inside of the steam separator 30 becomes full, and the operation shifts to the pumping operation.

During the pumping operation, the water taken into the pump chamber 18 is discharged from the pump chamber outlet 24 through the inlet 26 into the steam / water separation chamber 30, guided by the flow regulating plate 48, and smoothly from the discharge port 42. Is discharged. According to this embodiment, the air flow can be rectified by the rectifying plate 48 during the self-priming operation, so that the water-water separation performance can be improved and the self-priming performance can be improved. In addition, since no plunger is provided in the return hole 32, stable self-priming performance can be exhibited. In addition, suction port 3
4 and the discharge port 42 are both provided on the upper surface of the second casing 14.
The suction-side pipe and the discharge-side pipe are the same.
Can be piped in the same direction. Therefore, piping space is reduced
it can.

In the pumping operation, the water discharged from the inlet 26 can be discharged from the outlet 42 as it is, so that the pressure loss can be drastically reduced. Therefore, even if the return hole 32 is not closed. Sufficient pump performance can be obtained. In the above embodiment, the current plate 48 is
It extends in the left-right direction in the cross section taken along the line II-II (FIG. 1).
But extend in the front-rear direction as shown in FIG. 3, for example.
May be formed. The shape of the current plate 48 is, for example,
For example, the cross section may be shaped like a cross as shown in FIG.
Alternatively, the section may have a Y-shaped cross section as shown in FIG.

Also, between the inlet 26 and the discharge port 42
Is provided with an ejection nozzle 50 as shown in FIG.
It may be. The ejection port 52 and the ejection port 42 of the ejection nozzle 50
The gap L of the gap 54 provided between the
Sufficient water / water separation performance at times, and sufficient
In order to obtain the discharge pressure, the cross-sectional area and
It is adjusted according to the pump performance and the like. Such spout nozzle
When 50 is provided, the water discharged from the intake 26 is
Flow performance can be more smoothly led to 42
Can be improved.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an illustrative view showing a modified example of the current plate;

FIG. 4 is an illustrative view showing a modified example of the current plate;

FIG. 5 is an illustrative view showing a modified example of the current plate;

FIG. 6 It is an illustrative view showing a modification of a current plate.

FIG. 7 FIG. 10 is an illustrative view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Self-priming pump 18 ... Pump chamber 20 ... Impeller 30 ... Water / water separation chamber 32 ... Reflux hole 42 ... Discharge port 48 ... Rectifier plate 50 ... Ejection nozzle

Continuation of the front page (56) References JP-A 1-174590 (JP, U) JP-A 52-702 (JP, U) JP 32-22479 (JP, Y1) (58) Fields surveyed (Int) .Cl. ⁶ , DB name) F04D 9/02 101

Claims (2)

(57) [Claims] A first chamber including a pump chamber having an inlet and an outlet.
A casing, a steam-water separation chamber provided above the first casing;
, A suction port provided on the upper surface of the second casing, and a discharge port
An outlet, a separation plate separating the pump chamber and the air / water separation chamber, and a separation plate provided at a position facing the discharge port of the separation plate;
Take water released from the outlet into the steam separator
The inlet, the inlet and the outlet in the steam separator
A flow straightening plate which is disposed to extend in the up-down direction between the plates, and which is provided on the separation plate, and
The return hole to return to the pump chamber and the steam-water separation chamber
A water passage for communicating the suction port and the inlet.
That, self-priming pump. (2) From the inlet in the steam separator
A jet nozzle which is raised toward the discharge port.
And at least an upper end of the ejection nozzle and the discharge port.
The self-priming type according to claim 1, wherein the rectifying plate is disposed between the rectifying plates.
pump.