JPS61207943A - Circulating flow water tank - Google Patents

Abstract

PURPOSE:To prevent a mechanical noise generated when driving an impeller, from being transferred and resonated to a water tank body and a measuring drum, by providing a duct seal member which is connected watertightly without transmitting a vibration to a circulating flow duct, and an impeller shaft seal member. CONSTITUTION:An impeller part water tank drum 22 and an impeller shaft bearing 18 are fixed through an impeller part water tank drum supporting material 24, and an impeller shaft bearing part supporting material 28, respectively, to an impeller driving part supporting base 25 which has been separated from a water tank body 1 and installed independently. Its watertightness and airtightness are kept by an impeller shaft bearing part seal material 26 and an impeller part water tank drum seal material 27. The seal material is made of a flexible material such as elastic rubber, etc., and a mechanical noise and a vibration generated by an impeller driving part are not transferred nor resonated to the water tank body 1 and a measuring drum 3, therefore, a background noise level in the measuring drum 3 can be improved remarkably, and also other performance as a cavity water tank is not deteriorated at all.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a circulating water tank.

[Conventional technology]

In the conventional closed circulation water tank, as shown in the fourth factor diagram, the water tank body 1 forms a nearly rectangular closed flow path, and a portion of the impeller 21 provided in the water tank body 22 allows the inside of the water tank to be closed. The aquarium water is circulated to obtain a predetermined flow velocity in the measurement cylinder 3, and the test of the test Braveler 14 is conducted. 5. For rectifying material. A guide vane 6 and a corrugated portion 4 of the tank body are provided.

The test propeller 14 is attached to the test propeller shaft 9,
The coaxial bearing is the propeller shaft bearing 10. The propeller shaft 9 is supported by a propeller shaft intermediate bearing 11 and a propeller shaft propeller side bearing 12, and each of the above bearings is supported by the water tank body 1 by a rectifier 5 and a propeller shaft propeller side bearing supporting member 13. When the dynamometer 8 is driven, its torque and thrust are measured, and the dynamometer 8 is supported on the water tank body 1 by a dynamometer support 7.

The impeller 21 that circulates the aquarium water is the impeller shaft 17
The coaxial shaft is supported by an impeller bearing 18 and an impeller side bearing 19, the bearing 19 is mounted to the impeller part water tank body 22 by a support member 20, and the impeller shaft 17 is supported by the impeller drive motor 16. The motor is supported separately from the support member 2 of the water tank body 1 by an impeller drive motor support stand 15.

In addition, the water tank body 1, the measurement body 3, and part of the impeller water tank body 2
Although it is possible to separate it from 2, it is usually fixed liquid-tightly.The pressure inside the water tank can be adjusted by adjusting the air pressure in the pressure regulating part 23 with a vacuum pump, etc. (not shown). .

When testing the test propeller 14 using the hollow water tank with the above structure, adjust the test conditions, that is, the flow velocity and pressure in the measurement barrel 3, and the rotation speed of the test propeller 14.
Observing the cavity phenomenon of the test propeller, test propeller 1
4, the thrust and torque generated by the propeller 14 are measured, and the fluctuating pressure caused by the test propeller 14 is also measured.

By the way, in this type of circulating water tank, the test propeller 1
In recent years, there has been an increase in the number of cases in which the underwater sound generated by the operation of the water tank is measured. The transmission resonates with the main body 1 and the measurement body B,
The 8/N ratio of the underwater sound to be measured emitted by the test propeller 14 is significantly reduced.

[Problem that the invention seeks to solve]

The present invention has been proposed in view of the above circumstances, and provides a recirculation water tank in which the mechanical noise generated when the impeller is driven is prevented from being transmitted and resonated in the water tank body and the measurement body, and the noise is minimized. The purpose is to

[Means for solving problems]

To this end, the present invention has an impeller shaft that passes through the bend of a recirculation duct that forms a rectangular closed flow path, and the impeller shaft is driven by an external motor to circulate the aquarium water in the duct in a circular manner. In the recirculation tank,
A bed provided separately from the circulation duct, a motor protruding from one end of the bed, one end connected to the motor, the middle part passing through the bend part and an impeller fitted near the other end. an impeller shaft, a pair of front and rear bearing stands that respectively protrude from the bed and pivotally support the impeller shaft, a relatively short duct joint whose lower end is fixed to the bed and concentrically surrounds the impeller, and the duct joint. a pair of front and rear duct seal members that watertightly connect the front and rear end openings of the recirculation duct to the recirculation duct without transmitting vibrations; and an impeller shaft sealing member passing through the impeller shaft.

[For production]

With such a configuration, it is possible to prevent the mechanical noise generated when the impeller is driven from transmitting and resonating with the tank main body and the measurement barrel, and to provide a circulating water tank in which the noise is minimized.

〔Example〕

Embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a plan view showing the first embodiment, FIG. 2 is a plan view showing the second embodiment, and FIG. 3 is a plan view showing the third embodiment. FIG.

First, in the first embodiment shown in FIG. 1, the same symbols as in FIG. 4 indicate the same members as in FIG.
6 is a sealing material for the impeller shaft bearing portion, 27 is a sealing material for a part of the impeller tank body, and 28 is a supporting material for the impeller thin bearing portion.

In this embodiment, the impeller part water tank body 22 and the impeller shaft bearing 1 are mounted on the impeller drive part support stand 25 which is installed separately and independently from the water tank body 1, respectively. It is fixed via an impeller shaft bearing support member 28.

Note that watertightness and airtightness are maintained by the impeller shaft bearing sealing material 26 and the impeller part water tank body sealing material 27 so that the aquarium water does not leak from the connection part with the aquarium main body 1 in a part separated from the aquarium main body 1. Therefore, each sealing member is made of a flexible material such as elastic rubber, so that mechanical noise and vibration generated in the impeller drive section are not transmitted to the water tank body 1. .

According to such a structure, the mechanical noise and vibration generated from the impeller drive section are not transmitted and resonated to the water tank body 1 and the measurement body 3, so the background noise level in the measurement body 3 can be greatly improved. Moreover, other performances as a hollow aquarium do not deteriorate at all.

Next, in the second embodiment shown in FIG. 2, the same symbols as in FIG. 4 indicate the same members as in FIG.
3 is for the intermediate bearing water tank, 34 is the intermediate bearing water tank body support material, 35 is the propeller side bearing water tank support material, 36 is the propeller side bearing water tank body support material, 37 is the propeller side bearing water tank body sealing material, 38 Reference numeral 39 indicates a sealing material for the intermediate bearing portion for the water tank, and numeral 39 indicates a sealing material for the propeller thin bearing portion.

In this example, the propeller shaft bearing 10 of the test propeller shaft 9 is
．． Propeller shaft intermediate bearing 11. Each bearing of the propeller shaft propeller side bearing 12 is supported independently from the water tank body 1. That is, the propeller shaft bearing 10 is the propeller shaft bearing support member 31
It is firmly fixed to the dynamometer support base 7.

Further, the propeller shaft intermediate bearing 11 is supported by the propeller shaft intermediate shaft, the bearing support, and the member 32, and the support member is attached to the intermediate bearing portion water tank 33, and the water tank body is further supported by the intermediate bearing portion water tank body support member 32. 34, it is fixed to the dynamometer support stand 7.

Further, the propeller shaft propeller side bearing 12 is attached to the propeller side bearing part water tank 35 by the propeller shaft propeller side bearing support 13, and the water tank body 35 is attached to the propeller side bearing part water tank body support 36 to receive the driving force. It is fixed to the meter support stand 7.

In addition, each water tank 33 and 35 is separated from the water tank main body 1 by a small gap, and in order to keep the gap airtight, an intermediate bearing part water tank sealing material 38 and a propeller side bearing part water tank body sealing material 37 are installed, respectively. Further, a propeller thin bearing sealing material 39 is attached to the propeller shaft bearing 10 portion, and these sealing materials are made of, for example, an elastic rubber material.

The dynamometer support stand 7 is a support device (not shown) and is fixed separately from the water tank body 1.

With the above structure, all the shaft systems of the test propeller shaft 10 are independently supported without coming into contact with the water tank body 1 via a rigid member, and the airtightness inside the water tank is maintained.

Therefore, mechanical noise and vibrations caused by driving the test propeller 14 are not transmitted to the tank body 1 and the measurement barrel 3 via the structural members.

According to such a structure, the mechanical noise vibration generated by driving the test propeller shaft is not transmitted and resonated to the water tank body 1 and the measurement cylinder 3, so that the background noise level in the measurement cylinder can be improved. Moreover, the other functions of the hollow aquarium do not deteriorate in the slightest.

Furthermore, the third embodiment shown in FIG. 4 is a combination of the first and second embodiments, in which both the liquid drive impeller part and the test propeller part are separated from the water tank body and connected to the water tank body with a flexible member. The same symbols as in FIGS. 1 and 2 indicate the same members as in FIGS. 1 and 2, respectively.

According to such a structure, the background noise level in the measurement cylinder can be further reduced.

〔Effect of the invention〕

In short, according to the present invention, the impeller shaft is passed through the bend part of the circulation duct forming a substantially rectangular closed flow path, and the impeller shaft is driven by an external motor to circulate the aquarium water in the duct in a circular manner. In the recirculation water tank, there is provided a bell 4° separate from the recirculation duct, a motor protruding from one end of the bed, and one end connected to the motor and an intermediate portion passing through the bend. An impeller shaft with an impeller fitted near the other end, a pair of front and rear bearing stands each protruding from the bed and pivotally supporting the impeller shaft, and a lower end fixed to the bed to concentrically surround the impeller. a relatively short duct joint; a pair of front and rear duct seal members that watertightly connect the front and rear end openings of the duct joint to the recirculation duct without transmitting vibration; and a pair of duct seal members provided at the bend portion to transmit vibrations of the impeller shaft. By providing an impeller shaft sealing member that penetrates the bend part in a watertight manner, the mechanical noise generated when the impeller is driven is prevented from being transmitted and resonated to the water tank body and the measuring body, thereby reducing the noise. Because we are able to provide a circulating water tank that is as small as possible,
The present invention is extremely useful industrially.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a first embodiment of the present invention, Fig. 2 is a plan view showing a second embodiment thereof, Fig. 3 is a plan view showing a third embodiment thereof, and Fig. 4 is a plan view showing a known embodiment. It is a top view showing a circulation water tank. 1...Aquarium body, 2...Aquarium body support material, 3...
Measuring cylinder, 4... Wrinkle portion, 5... Straightening material, 6...
Guide vane, 7... Dynamometer support, 8... Dynamometer, 9... Propeller shaft for testing, 10... Propeller shaft bearing, 11... Propeller shaft intermediate bearing, 12... Propeller Shaft propeller side bearing, 13... Propeller shaft propeller side bearing support material, 14... Test propeller, 15... Impeller drive motor support stand, 16... (To 7, 7-H
K dynamic motor 17... Impeller shaft, 18... Impeller shaft bearing, 19... Impeller shaft impeller side bearing, 20... Impeller bearing support material, 21... Impeller, 22... Impeller , 23...pressure regulating section,
24... Impeller part water tank body support material, 25... Impeller drive part support base, 26... Impeller shaft bearing sealing material, 27... Impeller part water tank body sealing material, 28
... Impeller thin bearing part support material, 31 ... Propeller shaft bearing support material, 32 ... Propeller shaft intermediate bearing support material,
63... Intermediate bearing part for water tank, 34... Intermediate bearing part water tank body support material, 35... Propeller side bearing part for water tank, 36
. . . Propeller side bearing portion water tank body support material, 37 . . . Propeller side bearing portion water tank body sealing material, 38 . . . Intermediate bearing portion water tank sealing material, 39 . . . Propeller shaft bearing sealing material.

Claims (1)

[Scope of Claims] An impeller shaft passes through a bend portion of a circulation duct forming a substantially rectangular closed flow path, and the impeller shaft is driven by an external motor to circulate water in the duct in a circular manner. In the recirculation water tank, there is a bed provided separately from the recirculation duct, a motor protruding from one end of the bed, one end connected to the motor, an intermediate part passing through the bend part, and an impeller near the other end. an impeller shaft fitted with the impeller shaft; a pair of front and rear bearing stands each protruding from the bed and pivotally supporting the impeller shaft;
a relatively short duct joint whose lower end is fixed to the bed and concentrically surrounds the impeller; and a pair of front and rear duct seal members that watertightly connect the front and rear end openings of the duct joint to the circulation duct without transmitting vibrations. An impeller shaft sealing member provided at the bend portion and penetrating the impeller shaft watertightly into the bend portion without transmitting vibrations of the impeller shaft.