JPH08544Y2 - Underwater roots blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an underwater roots blower and is used when performing air ratio for water treatment and the like.

(Prior Art) Conventionally, an underwater roots blower has been provided in which two rotors maintain the same phase and rotate about a vertical axis to compress the air sucked from the suction port side and discharge the compressed air to the discharge port side.

(Problems to be solved by the invention) However, in the above conventional submersible roots blower, since the lower end portion of the suction port and the discharge port formed in the casing is formed higher than the bottom surface of the casing, the suction port side Dust, dust, and other contaminants easily enter the casing, and conversely, it is difficult for the contaminants to be discharged from the casing to the discharge port side, and thus the contaminants easily accumulate in the casing. For this reason, there is a problem that contaminants are accumulated in the casing due to long-term operation, and the contaminants are caught in the rotor arranged in the casing, and the rotor is locked when restarted.

(Means for Solving the Problems) The submersible roots blower of the present invention is a roots-type submersible blower in which a rotor is rotatably arranged in a casing, and a suction port and a discharge port are formed on a side portion of the casing. ,
A part of the bottom surface of the casing, which is a connecting portion with the suction port and the discharge port, is formed in a concave shape, and the concave portion is connected to the lower ends of the suction port and the discharge port in a flat state.

(Operation) By forming a part of the bottom surface of the casing, which is a connecting portion with the suction port and the discharge port, into a concave shape and communicating the concave part with the lower ends of the suction port and the discharge port in a flat state, the suction port and the The lower end of the discharge port is lower than the bottom surface of the casing, and the contaminants are less likely to enter the bottom surface of the casing from the suction port side, and are easily discharged from the bottom surface of the casing to the discharge port side.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an underwater roots blower according to the present invention.

In FIG. 2, reference numeral 10 denotes an electric motor provided in a casing 15, and the electric motor 10 is used with its rotating shaft 11 arranged vertically. The rotating shaft 11 of the electric motor 10 extends below the casing 15. Also, the casing 15
An eyebolt 12 is provided on the top of the, and a chain 13 is connected to the eyebolt 12.

Below the electric motor 10, a roots blower 20 having two rotors 21a and 21b that rotate around a vertical axis is provided adjacent to each other. One of the rotating shafts 22a, 22b of the roots blower 20 is connected to the lower extension end of the rotating shaft 11 of the electric motor 10 by a coupling 23, and the rotating shafts 22a, 22b are connected to the rotors 21a, 22b. 21b is provided. This roots blower 20 is deployed in the casing 25,
As shown in FIGS. 1 to 3, a suction port 26 and a discharge port 27 are formed on opposite side surfaces of the casing 25.

Casing 25 that serves as a connecting portion with suction port 26 and discharge port 27
A part of the bottom surface of the suction port 26 is formed in a concave shape.
And, it is communicated with the lower end of the discharge port 27 in a flat state.
Therefore, the lower ends of the suction port 26 and the discharge port 27 are lower than the bottom surface 25a of the casing 25 by the depth S of the recess through the recess.

Further, below the roots blower 20, the rotors 21a,
A timing gear device 30 is provided for timing the rotation of 21b. This timing gear device 30
Is provided in the casing 35, and the casing
It consists of two gears 31a, 31b provided in the downward extension of the rotary shafts 22a, 22b which penetrate the bottom portion 25a of 25.
1b mesh with each other.

The casings 15, 25, 35 are watertightly integrated to form a casing C except for the suction port 26 and the discharge port 27.

As shown in FIG. 1, a suction pipe 50 extending upward is connected to the suction port 26 of the casing 25, and a filter 51 is provided at the tip of the suction pipe 50.

Further, as shown in FIG. 1, a discharge pipe 60 extending upward is connected to the discharge port 27 of the casing 25,
An extension pipe 70 is connected to its upper end. Further, an air diffuser 72 is provided at the lower end of the extension pipe 70. This air diffuser
72 is formed by, for example, forming a large number of pores 72a ...
It is configured to make the discharged air into a fine bubble shape.

Next, the operation of the underwater roots blower configured as described above will be described.

When the rotating shaft 11 is rotated by the driving of the electric motor 10, the rotating shaft 22a of the roots blower 20 is rotated accordingly and the rotor 2 is rotated.
The timing gear device 30 causes the 1a and 21b to rotate while maintaining the same phase. As a result, air is sucked into the roots blower 20 through the suction pipe 50 and the suction port 26 from the filter 51 in the air. In the roots blower 20, the air is compressed by the two rotors 21a and 21b which always rotate with a constant gap, and the compressed air is discharged from the discharge port 27 through the discharge pipe 6
0, send to the air diffuser 72 via the extension pipe 70. Then, this air becomes fine bubbles from the pores 72a of the air diffuser 72 and is discharged into the wastewater. In this way, aeration is performed.

Here, when contaminants such as small dust and dust are mixed in the air sucked from the suction pipe 50, these contaminants are introduced from the suction port 26 into the casing 25 in which the rotors 21a and 21b are arranged.
However, since the lower end of the suction port 26 is lower than the bottom surface 25a of the casing 25, it acts to suppress the intrusion of this contaminant. That is, it is possible to minimize the mixture of contaminants into the casing 25. Further, even if contaminants are mixed in the casing 25, since the lower end portion of the discharge port 27 is lower than the bottom surface 25a of the casing 25, it is easy to be discharged from the inside of the casing 25 to the discharge port 27 side. It is possible to suppress the accumulation of contaminants inside the rotor 25, so that the rotors 21a and 21b inside the casing 25
Can be driven smoothly.

(Effect of the Invention) As described above, according to the present invention, a part of the bottom surface of the casing, which is a connecting portion with the suction port and the discharge port, is formed in a concave shape, and the concave portion is formed at the lower ends of the suction port and the discharge port. By communicating with the section in a flat state, the lower ends of the suction port and the discharge port become lower than the bottom surface of the casing, and it is difficult for contaminants to enter the bottom surface of the casing from the suction port side, even if it enters the casing. Even if an object enters, it is easily discharged from the bottom surface to the ejection port side through the recess. As a result, stagnation of the contaminants in the casing can be suppressed, a locking accident of the rotor due to the stagnation of the contaminants can be prevented, and the rotor can be smoothly driven.

[Brief description of drawings]

1 to 3 show an embodiment of an underwater roots blower according to the present invention, and FIG. 1 is a side view showing the underwater roots blower,
2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. 21a, 21b …… Rotor 25 …… Casing 26 …… Suction port 27 …… Discharge port

Claims (1)

[Scope of utility model registration request] 1. A roots-type submersible blower in which a rotor is rotatably arranged in a casing, and a suction port and a discharge port are formed on a side portion of the casing, and a connecting portion between the suction port and the discharge port. An underwater roots blower characterized in that a part of the bottom surface of the casing is formed in a concave shape, and the concave portion is communicated with the lower ends of the suction port and the discharge port in a flat state.