JP2000297791A - Swirl type pump - Google Patents

Abstract

(57) [Summary] [Problem] To provide a configuration in which there is no air pocket at a priming port at the time of priming at the time of initial operation and simplify the shape of a discharge passage. A suction port is provided in a suction passage with a detachable priming tap having a screw, and a discharge port is also provided with a deaeration port in which a deaeration tap having the same screw is detachable. Same parts. In addition, an opening is provided in the discharge passage, the upper end of which is formed higher than the upper end of the priming port, and a cylindrical pipe is fitted in the discharge passage so that the axis is parallel to the vertical direction, The upper end of the cylindrical pipe is formed higher than the upper end of the priming port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the shape and configuration of a water passage of a domestic vortex pump.

[0002]

2. Description of the Related Art A conventional vortex pump will be described with reference to FIGS.

[0003] An impeller 12a directly connected to the motor shaft 10
A water passage is formed by the suction passage 13 communicating with the suction pipe 16a on the water source 15 side and the discharge passage 14 communicating with the discharge pipe 18a on the faucet 18b side, thereby isolating the suction passage 13 and the discharge passage 14. A partition wall 19 is formed. A passage is formed in the discharge passage 14 at a position once higher than the impeller 12a, and an opening 14a is provided.
b is the upper end 20b of the priming port 20a provided in the suction passage 13.
It is formed lower. Therefore, a gap L250b is generated.

A priming faucet 35a is made of a resin which is inexpensive and has excellent corrosion resistance, and is provided with a stolen portion 35b so as not to cause a problem such as sink during molding. I have.

A check valve 16b is provided at the end of the suction pipe 16a so that water from the faucet 18b to the suction pipe 16a does not flow back to the water source 15 when the pump is stopped.

[0006] When starting the pump for the first time, first the priming faucet 35
Then, the suction pipe 16a and the suction passage 13 are filled with water, and priming is performed to the position of the opening upper end 14b, that is, the water level 60a in FIG. Suction passage 1 at this time
3 has a water level of 55.

According to the above configuration, the gap L250b
Therefore, the air reservoir 23 is formed in the priming port 20a between the water level 55 and the priming port upper end 20b.
When the pump is started in this state, the flow 25a of water guided to the discharge passage 14 by the rotation 12b of the impeller 12a
While the air in the air reservoir 23 is entrained,
, The suction passage 13 and the discharge passage 14 may be communicated with the air 24 through the partition wall 19 as shown in FIG.

The discharge passage 14 which has a high pressure by a pump action
When the air and the suction passage 13 that is a negative pressure communicate with the air 24, the generation of the negative pressure in the suction passage 13 is reduced. That is,
Since the pumping action is reduced, there is a problem that pumping is impossible especially at a suction height of 7 to 8 m, which is the practical use limit suction height of a vortex pump.

When priming is performed when the faucet 18b is closed when priming is performed, the partition wall 19 opens the opening 14a.
Since the airway cannot be replaced by the priming port 20a due to the presence of the partition wall 19, the portion above the partition wall 19 cannot be primed and reaches the water level 60b in FIG. Thus, the impeller 1
When the pump is started with little water separating the air from the discharge passage 2a and the discharge passage 14, the air in the discharge passage 14 is instantaneously caught in the reverse flow 25b generated by the water flow 25a as shown in FIG. The passage 13 communicates with the air 24. At this time, since the discharge passage 14 is at atmospheric pressure, the suction passage 13 cannot be made to have a negative pressure, so that the pump action is lost and pumping is impossible.

Next, the discharge passage 14 will be described in detail.

The passage area of the discharge passage 14 is smaller than the passage area of the suction passage 13.

This is because, at the practical use limit suction height of a vortex pump of 7 to 8 m, air dissolved in water separates from water, that is, bubbles generated by so-called cavitation are combined with each other and grown. At this time, if the faucet 18b is squeezed and used, for example, at 3 to 4 L / min, the flow velocity becomes slower, so that the buoyancy 27b of the bubble 27a grown as shown in FIG. The discharge passage 14 floats up to reach the upper end 14b of the opening, and is caught by the reverse flow 25b, so that the discharge passage 14 and the suction passage 13 communicate with the air 24 and cannot be pumped.

Therefore, by reducing the passage area and increasing the flow velocity, the bubbles are easily discharged to the faucet 18b before growing into the bubbles 27a.

FIG. 8 is a view of a core used when casting the casing 1 having the suction passage 13, the discharge passage 14, and the like. The shapes of the suction passage 13 and the discharge passage 14 are the same as the shape of the core. Generally, the core is secured by mixing sand and chemicals and sintering. However, as described above, the cross-sectional area of the core is reduced in order to reduce the passage area of the discharge passage 14, and the core is further cut. Notch 4
Since there is 0, cracks 45a are easy to enter particularly from the notch portion 40, and when casting is performed, burrs 45b are generated in this portion to block the passage. This state is shown in FIG. 9 and FIG.
Since burrs 45b are formed in portions that are difficult to confirm visually, a test is performed after product assembly and the flow rate is checked. Until the problem of insufficient flow rate occurs, it is not known that burrs 45b are generated and there is a problem in productivity. .

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-quality vortex pump which can be easily pumped at the start of operation and is easy to manufacture.

[0016]

SUMMARY OF THE INVENTION The object of the present invention is to provide a detachable priming cock in a suction passage, and a detachable evacuating cock in a discharge passage. Is achieved by:

In the discharge passage, a passage is formed at a position once higher than the impeller, and an opening is provided. The upper end of the opening is formed higher than the upper end of the priming port.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

An impeller 12a is directly connected to the motor shaft 10, and a casing cover 2 forming a water passage so as to cover the impeller 12a is provided, and a suction passage 13 and a discharge passage 14 are connected to this. Forms a water passage. Further, the suction passage 13 and the discharge passage 14 are separated by a partition wall 19.

A suction pipe 16a is connected to the water source 15 side from the suction passage 13, and a check valve 16b is connected to a tip of the suction pipe 16a to prevent water from flowing back to the water source 15 when the pump is stopped.
Is provided. The suction pipe 16a and the check valve 16
The connection of b is performed by an installer. The suction passage 13 is provided with a priming port 20a to which a priming tap 35 having a screw can be attached and detached, and the discharge passage 14 is also provided with a deaeration port 22 to which a deaeration tap 36 also having a thread can be attached and detached. In addition, the priming tap 35 and the deaeration tap 36 are the same parts. In the conventional vortex type pump, only the priming tap 35 is provided in the suction passage 13. Therefore, when priming is performed with the faucet 18b closed when the priming is performed, the passage from the partition wall 19 to the opening 14a has the partition wall 19. As a result, since the air cannot be replaced by the priming port 20a, the portion above the partition wall 19 cannot be primed and reaches the water level 60b in FIG.

As described above, the impeller 12a and the discharge passage 14
When the pump is started in a state where the amount of water separating the air is small, the reverse flow 2 generated by the water flow 25a as shown in FIG.
The air in the discharge passage 14 is instantaneously entrapped in 5b, and the discharge passage 14 and the suction passage 13 communicate with each other by air 24. At this time, since the discharge passage 14 is at atmospheric pressure, the suction passage 13 may be set to a negative pressure. Without this, pumping action is lost and pumping becomes impossible.

However, the provision of the deaeration port 22 in the discharge passage 14 allows the air in the discharge passage 14 to be degassed, so that the passage from the partition wall 19 to the opening 14a can be primed.

The discharge passage 14 is provided with an opening 14a as shown in FIG.
It is formed higher than the priming port upper end 20b so as to generate 50a.

In the conventional vortex pump, the upper end 14b of the opening is formed lower than the upper end 20b of the priming port as shown in FIG. 5. Therefore, when priming is performed, there is a gap L250b. An air reservoir 23 is formed between the upper end 20b of the priming port, and when the pump is started in this state, the air reservoir 23 is added to the flow 25a of water guided to the discharge passage 14 by the rotation 12b of the impeller 12a.
The air is guided to the vicinity of the partition wall 19 while being entrained, and the suction passage 13 and the discharge passage 14 are separated from the partition wall 19 as shown in FIG.
May be communicated with the air 24 via the air.

The discharge passage 14 which has a high pressure due to the pump action
When the air and the suction passage 13 that is a negative pressure communicate with each other, the generation of the negative pressure in the suction passage 13 is reduced. That is,
Since the pumping action is reduced, there is a problem that it is impossible to pump up water particularly at a suction height of 7 to 8 m, which is the practical use limit suction height of a vortex pump.

However, since the upper end 14b of the opening is formed higher than the upper end 20b of the priming port, water does not flow down from the opening 14a to the downstream side of the discharge passage 14 before the water overflows from the upper end 20b of the priming port. No air pocket is formed in the port 20a.

As a method of forming the opening 14a, FIG.
A resin cylindrical pipe 30a is formed in the discharge passage 14 as shown in FIG.
Is fitted through an O-ring 30c to form a cylindrical pipe 30a.
May be formed so as to form the gap L150a. When the opening 14a is formed integrally with the casing 1 as shown in FIG. 1, a core used when casting the casing 1 is cut from the notch 40 as shown in FIG.
If 5a is easily cast, burrs 45b are formed in this portion and block the passage. This state is shown in FIG. 9 and FIG. Since burrs 45b are formed in portions that are difficult to visually confirm, a test is performed after assembly of the product, the flow rate is checked, and it is not known that the burrs 45b are generated until the problem of insufficient flow rate occurs, and there is a problem in productivity. However, casing 1
By providing the cylindrical pipe 30a of another piece, the notch portion 40 can be reduced, and the burr 45b is less likely to occur.

[0028]

According to the present invention as described above, it is possible to solve the problem that water cannot be pumped at the time of the initial operation, and it is possible to obtain a high-quality and high-productivity vortex pump in production.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 3 is a sectional view of FIGS. 1 and 2;

FIG. 4 is an overall configuration diagram showing a conventional example.

FIG. 5 is a diagram showing a water level of priming water.

FIG. 6 is a detailed view of a conventional pump unit.

FIG. 7 is a diagram showing the flow of water and the movement of bubbles in a discharge passage of a conventional example.

FIG. 8 is a diagram showing a core of a conventional example.

FIG. 9 is a diagram showing burrs generated at the upper end of an opening in a conventional example.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Casing, 2 ... Casing cover, 10 ... Motor shaft, 12a ... Impeller, 12b ... Impeller rotation, 13 ...
Suction passage, 14 ... discharge passage, 14a ... opening, 14b ...
Upper end of opening, 15: water source, 16a: suction pipe, 16b ...
Check valve, 18a: discharge pipe, 18b: faucet, 19: partition, 20a: priming port, 20b: priming port top, 22 ...
Deaeration port, 23 ... Air reservoir, 24 ... Air, 25a ... Water flow, 25b ... Reverse flow, 27a ... Bubbles, 27b ... Buoyancy of bubbles, 27c ... Force to flow bubbles, 30a ... Cylindrical pipe , 30b ... upper end of a cylindrical pipe, 30c ... O-ring,
35a: Priming tap, 35b: Stealing part, 36: Deaeration tap, 4
0: core notch, 45a: crack, 45b: burr, 5
0a: gap L1, 50b: gap L2, 55: priming water level of the suction passage, 60a: priming water level of the discharge passage when the faucet is opened, 60b: priming water level of the discharge passage when the faucet is closed.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H034 AA01 AA13 BB04 CC03 DD02 DD12 DD22 DD24 DD28 EE04 EE07

Claims (2)

[Claims] 1. An impeller directly connected to a motor shaft, a water passage covering the impeller, a suction passage and a discharge passage communicating with the water passage, and a partition separating the suction passage and the discharge passage. In the vortex flow pump, a detachable priming tap is provided in the suction passage, a detachable deaeration tap is provided in the discharge passage, and the priming tap and the deaeration tap are made of the same part. Swirl pump. 2. The vortex pump according to claim 1, wherein an opening of a discharge passage is provided at a position higher than an upper end of the priming tap.