JPH0111987Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a water ring vacuum pump.

Conventionally, the suction and exhaust directions of water ring vacuum pumps are such that the suction and discharge ports are arranged horizontally on both sides of the pump, and gas flows in the horizontal direction rather than in the horizontal direction. There are problems in that the performance is low and unstable, the exhaust noise is generally high, and a large amount of water mixed with the gas on the discharge side is discharged and scattered.

As a solution to these problems, Tokko Sho
Although there is an invention disclosed in Publication No. 26-3837, the free surface of the water seal is not stable because the exhaust gas passes through the exhaust passage at high speed, and the same problem cannot be solved. There is a problem in that it is difficult to manufacture because it is an integrated side cover.

Furthermore, the inventions disclosed in Japanese Patent Publication No. 43-2668 and Japanese Patent Publication No. 37-9884, which allow the port cylinder and cylinder cover to be assembled separately, have a bulkhead or partition wall inside the cylinder cover, making the cylinder cover complicated. Therefore, it is difficult to manufacture.
Another disadvantage is that the intake resistance is large.

The purpose of this invention was to take into account the above-mentioned problems with water ring vacuum pumps.The purpose of this invention was to improve pump performance and stability in high vacuum areas, reduce exhaust noise, and reduce water droplets that are discharged and scattered with discharged gas. The purpose is to measure the decrease in Another object of this invention is to provide a water ring vacuum pump that is easy to manufacture.

Embodiments of this invention will be described below with reference to the drawings. 1 is a sectional view taken along the line AA in FIG. 2, and FIG. 2 is a sectional view taken along the line BB in FIG.

A bracket 2 is fixed to the motor 1, and the shaft is sealed by a shaft sealing device 3 attached to the bracket 2, and the motor shaft 4 protrudes into a casing 5 sealed and fixed to the bracket 2, and is connected to the rotor via a key 6. The boss 7 is fitted, and the nut 8 is screwed into the threaded part of the shaft end of the motor shaft 4 via the washer.
and the rotor 7 is fixed.

The inner periphery of the casing 5 is shaped like a cocoon in the vertical direction, and the outer periphery of the rotor 7 is close to the short diameter portion of the casing 5 at the vertical center position.

The rotor 7 consists of a cylindrical portion 9, side plates 11, and radial blades 12 integrally provided between them. A through hole is formed in the cylindrical portion 9 in the radial direction between the blades 12. The side plate 11 is water-sealed with a small gap from the side member of the bracket 2, and is also water-sealed with a small gap from the casing cover 10 which is hermetically fixed to the casing 5. In FIG. 1, the outer shape of the casing cover 10 is shown by a two-dot chain line.

A cylindrical portion of a port cylinder 13 is fitted into the inner diameter of the cylindrical portion 9 of the rotor 7 . The cylindrical portion of the port cylinder 13 has intake ports 14, 14' and exhaust ports 15, 15' diagonally above each other, and
The port cylinder 1 is provided in the axial direction in alignment with the through hole between the blades 12 of the cylindrical portion 9 of the rotor 7.
A partition wall is provided within the cylindrical portion 3 to define four spaces including either one of the intake ports 14, 14' and the exhaust ports 15, 15'. The port cylinder 13 has an integrally formed flange 16.
is fitted and fixed into the casing cover 10,
The cylindrical portion extends outward in the axial direction and is fitted into the inside of the intake port 17 of the casing cover 10 via a sealing ring 18.

Intake ports 14, 14' of port cylinder 13
The spaces including the intake passages 19 and 19' respectively form intake passages 19 and 19'.
The spaces containing the exhaust ports 15, 15' form exhaust passages 21, 21', respectively. intake passage 19,
19' merge toward the outwardly extending end opening of the port cylinder 13. Port cylinder 1
An intake port 17 is provided in the casing cover 10 in alignment with the opening at the end portion extending outwardly from the casing cover 10 , and the merging intake passage communicates with the intake port 17 . exhaust passage 21,
21' respectively open in the large volume exhaust chamber 22 of the casing cover 10 in the radial direction around the circumference of the port cylinder 13 and communicate with the exhaust port 23. The exhaust chamber 22 is designed so that the separation of air and water in the exhaust gas is sufficiently large.
The horizontal cross section of the exhaust port 23 is made larger than that of the exhaust port 23.

The illustrated height H of the exhaust port 23 is the outer diameter D2 of the rotor 7.
That's all.

When water is injected to the fullest through the exhaust port 23 of the casing cover 10 and the motor 1 rotates, the rotor 7
rotates in the counterclockwise direction in FIG.
2 form one room, and the space between the water film gradually expands and contracts, so the intake ports 14 and 1
The gas is sucked in from the 4' side, that is, from the intake port 17 through the intake passages 19, 19', and is pushed out to the exhaust ports 15, 15' as the rotor 7 rotates, passes through the exhaust passages 21, 21', and enters the exhaust chamber. 22
is pushed out, overcomes the water head in the exhaust chamber, and exits the exhaust port 2.
3 and generates a vacuum on the intake side. In this case, the initial excess water is drained away, leaving the free surface 24. Thereafter, the free surface 24 is maintained by makeup water.

This idea extends the port cylinder in the axial direction, partitions the inside of the port cylinder, and merges the two intake passages toward the end opening that extends in the axial direction, and connects the two exhaust passages from the cylindrical part of the port cylinder. The casing cover opens in the radial direction toward the exhaust chamber, and is provided with an exhaust port at the top of the exhaust chamber of the casing cover, and the extending portion of the port cylinder is hermetically inserted into the casing cover, and the port cylinder is opened in the opening at the end of the port cylinder. In addition, a water seal type vacuum is provided in which an intake port is provided in the casing cover, an exhaust chamber is provided as a single space within the casing cover, and the horizontal cross section of the casing cover is provided larger than the exhaust port. (a) The vacuum part inside the pump casing 5 and the atmosphere are blocked by the water pool in the exhaust chamber 22 of the casing cover, and the vacuum is prevented from flowing back into the pump casing 5 from the exhaust port 23 of the atmosphere. Improved performance.

(b) Pump exhaust is in the exhaust chamber 22 with a casing cover.
Vacuum performance was improved by passing through a puddle of water.

(c) Since the exhaust chamber 22 is sufficiently wide and the rising speed of the exhaust gas is slow, water droplets contained in the exhaust gas are sufficiently separated.

(d) The structure of the casing cover is simple, the exhaust chamber can be easily enlarged, and it is easy to manufacture.

effect occurred.

[Brief explanation of the drawing]

1 and 2 are drawings showing an embodiment of this invention, in which FIG. 1 is a sectional view taken along line AA in FIG. 2, and FIG. 2 is a sectional view taken along line BB in FIG. 1. 5...Casing, 7...Rotor, 9...Cylindrical part, 10...Casing cover, 11...Side plate,
12...Blade, 13...Port cylinder, 14,
14'...Intake port, 15,15'...Exhaust port, 17...Intake port, 19,19'...Intake passage,
21, 21'...exhaust passage, 22...exhaust chamber, 2
3...exhaust port, 24...free surface.

Claims (1)

[Scope of utility model registration request] In water ring vacuum pumps, air intake and exhaust are performed from one side of the pump casing in the axial direction through a port cylinder inserted into the inner circumference of the rotor and a casing cover fixed to the pump casing. Two intake passages extending in the axial direction to partition the inside of the port cylinder are merged toward an end opening extending in the axial direction, and two exhaust passages are formed from the cylindrical portion of the port cylinder toward the casing cover exhaust chamber. It opens in the radial direction and has an exhaust port at the top of the exhaust chamber of the casing cover, and the extension part of the port cylinder is hermetically inserted into the casing cover, and the intake port is installed in the casing cover in line with the opening at the end of the port cylinder. A water ring vacuum pump characterized in that the exhaust chamber is provided as a single space within the casing cover, and the horizontal cross section of the casing cover is larger than the exhaust port.