JPH0647840U - Duct with rectifying plate - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to provide a duct with a current plate that can completely rectify a water flow and improve the test accuracy in a circulating water tank. [Structure] An observation section 2 and a duct section 3 that connects the front and rear of the observation section 2 in an annular shape downward. A guide vane 9 is arranged at a corner of the duct section 3, and the outflow end of the duct section 3 and the observation section 2 are arranged. In the circulating water tank 1 in which the flow-straightening plate 10 and the wire net 11 having the honeycomb structure are provided at the boundary with the inflow end, one end of the shaft 5 on which the impeller 4 is fixed in the duct part 3 having a cylindrical cross section directly below the observation part 2 is a bearing 6 Is connected to the motor 7 via the
3 to extend radially from the outer circumference of the bearing 13 at the other end to the inner surface of the duct portion 3 and to rectify the turbulence of the water flow generated by the impeller 4, in order to rectify the turbulence of the water flow, the impeller portion straightening plate 8 also serving as a bearing is provided behind the impeller 4. Is to be fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a duct part of a circulating water tank for generating a water flow by an impeller, and more particularly to a duct structure for rectifying a water flow.

[0002]

[Prior art]

 Conventionally, this kind of device is a circulating water tank 21 composed of an observation part 22 and a duct part 23, as shown in FIGS. 3 and 4, and is provided in a lower duct part 23 having a cylindrical cross section directly below the observation part 22. The impeller 24 is fixedly mounted on the shaft 25 supported by the bearings 26 and 28. The bearing 28 behind the impeller 24 is fixed in the duct portion 23 by a plurality of stays 33 and is connected to the shaft 25 by a motor 27. In order to rotate the impeller 24 to generate a water flow 32 in the circulating water tank 21, and to straighten the water flow 32 that has become a rotating flow, guide vanes 29 are provided at the corners of the duct part 23, and the duct part It is known that a rectifying plate 30 and a wire net 31 having a honeycomb structure are arranged at the boundary between the outflow end of 23 and the inflow end of the observation part 22 to perform a rectifying action.

[0003]

[Problems to be solved by the device]

 As described in the prior art, the guide vanes provided in the circulating water tank, the rectifying plate having the honeycomb structure, and the wire mesh have a rectifying action at a position away from the impeller, which is the source of the water flow, so that the flow becomes a rotating flow. There was a problem that the flow of water could not be rectified completely and the accuracy of the test by the circulating water tank deteriorated.

The present invention has been made in view of such problems of the conventional technology, and the purpose thereof is to make it possible to completely rectify the water flow and to improve the test accuracy in a circulating water tank. It is intended to provide a duct with a rectifying plate that can improve the above.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises an observing section and a duct section that connects the front and rear of the observing section downward in an annular shape. Guide ducts are provided at the corners of the duct section, and the duct section is provided. In a circulating water tank in which a rectifying plate having a honeycomb structure and a wire mesh are arranged at the boundary between the outflow end of the observation part and the inflow end of the observation part, a shaft for fixing the impeller in the duct part having a cylindrical cross section immediately below the observation part One end of the shaft is connected to a motor outside the duct part through a bearing, the other end of the shaft is supported by a bearing, and the other end of the shaft extends radially from the outer circumference of the bearing to the inner surface of the duct part, and the impeller In order to rectify the turbulence of the generated water flow, a rectifying plate that doubles as a bearing is fixedly installed behind the impeller.

[0007]

[Action]

 The straightening vane, which has a twist angle opposite to the impeller blade angle, has a rectifying action that cancels the water flow, which is the rotating flow generated by the impeller, in the twisting direction corresponding to the impeller blade angle. Work and let go straight.

A straightening plate that also serves as a bearing and extends radially from the outer periphery of the bearing to the inner surface of the duct portion suppresses vibration of the bearing.

[0009]

【Example】

 An embodiment will be described with reference to the drawings. As shown in FIGS. 1 and 2, the circulating water tank 1 is composed of an observation section 2 and a duct section 3 that connects the observation section 2 to the front and the bottom in an annular shape. The duct part 3 has a cylindrical cross section only directly below the observation part 2, and the others have a rectangular cross section.

Guide vanes 9 are arranged at the corners of the duct portion 3, and a flow straightening plate 10 and a wire net 11 having a honeycomb structure are arranged at the boundary between the outflow end of the duct portion 3 and the inflow end of the observation portion 2. To do.

An impeller 4 is fixedly installed by inserting a shaft 5 into the duct 3 directly below the observation unit 2, and one end of the shaft 5 is connected to a motor 7 outside the duct 3 via a bearing 6 so that the shaft 5 The other end of is supported by a bearing 6, and an impeller rectifying plate 8 radially extending from the outer periphery of the bearing 6 to the inner surface of the duct 3 is fixed, and the impeller rectifying plate 8 is opposite to the blade angle of the impeller 4. Has a twist angle.

In this embodiment, the impeller 4 rotated by driving the motor 7 generates a rotational flow that advances in a twisting direction corresponding to the blade angle of the impeller 4, and the rotational flow is in the direction opposite to the blade angle of the impeller 4. The impeller rectifying plate 8 having a twist angle receives the rectifying action in the initial stage and goes straight in the duct 3, and at the corners in the duct 3, it moves along the guide vanes 9 from the outflow end of the duct 3. At the boundary portion toward the inflow end of the observation unit 2, the final stage rectifying action is performed by the rectifying plate 10 and the wire net 11 having the honeycomb structure, and the water flow 12 is further rectified.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Since the flow straightening plate is installed just behind the impeller, which is the source of the water flow, the flow flow has a flow straightening effect in the initial stage, the flow flow straightening effect is improved, and the water flow can be completely straightened. The test accuracy in the water tank can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall view of a circulating water tank according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a cross-sectional view taken along the line XX of FIG.

FIG. 3 is a schematic view of a conventional circulating water tank.

4 is a schematic view showing a cross-sectional view taken along the line YY of FIG.

[Explanation of symbols]

 1 time water tank 2 observation part 3 duct part 4 impeller 5 shaft 6 bearing 7 motor 8 impeller part straightening plate 9 guide vanes 10 straightening plate 11 wire mesh 12 water flow 13 bearing

Claims (1)

[Scope of utility model registration request] 1. An observation section and a duct section that connects the front and rear of the observation section downward in an annular shape, and guide vanes are arranged at the corners of the duct section, and the outflow end of the duct section and the inflow of the observation section. In a circulating water tank in which a rectifying plate and a wire net having a honeycomb structure are arranged at a boundary portion with an end, one end of a shaft for fixing an impeller in the duct portion having a cylindrical cross section immediately below the observation portion has a duct portion through a bearing. To connect to an outer motor, the other end of the shaft is supported by a bearing, and to extend radially from the outer periphery of the bearing at the other end to the inner surface of the duct portion, and to rectify the turbulence of the water flow generated by the impeller , A duct with a current plate, characterized in that a current plate also serving as a bearing is fixedly provided behind the impeller.