JPH0561497U - Fluid booster with sleeve - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent turbulent flow of the intake fluid 21 of the blower 1 near the bellmouth of the impeller 11 and reduce the intake loss. [Structure] A passage 2 for an intake fluid 21 is formed in a spiral shape whose winding direction is opposite to that of a discharge casing 10. Further, a guide vane 6 for further swirling the sucked fluid is attached to the end of the spiral.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid booster device with a sleeve, such as a blower or a pump, which boosts and delivers a fluid by centrifugal force.

[0002]

[Prior Art]

 The centrifugal fluid pressure booster with rotating blades sucks the fluid sucked from the suction port from the bell mouth on the side of the center of the rotating impeller and gives centrifugal force to this to discharge it to the outside in the radial direction of the rotating impeller. , It swirls inside the spiral discharge casing and discharges from the discharge port opened in the cutting line direction. The suction port of such a centrifugal fluid pressurizing device includes a single suction type and a double suction type. This suction port is a suction port that sucks in a straight line in the axial direction of the rotary impeller, and a suction port that has a suction port that passes through a passage that is bent 90 ° from a direction perpendicular to the axial direction of the rotary impeller. There is.

The latter type fluid pressure booster having a suction port is referred to as a sleeve type because its outer shape seems to have a sleeve. For example, “Nippon Kogyo Shuppan: Blower Handbook” describes a blower with a sleeve. FIG. 5 shows a blower with a single-suction sleeve, in which a centrifugal force is applied by an impeller 11 to the suction fluid 21 sucked from the suction port 2 to increase the pressure in the discharge casing 10 and discharge the discharge fluid 22. FIG. 6 shows an air blower with both suctions, in which a centrifugal force is applied by the impeller 11 to the suction fluid 21 sucked from both suction ports 2, and the discharge fluid 22 is discharged by raising the pressure in the casing 10. Hereinafter, the present invention will be described in detail by taking a blower as an example.

[0004]

[Problems to be solved by the device]

 In the conventional sleeve fan, as shown in FIG. 4, the intake fluid 21 flows in at a 90 ° angle from the direction perpendicular to the bell motor of the impeller. Since the inflow fluid 21 has a side where the inflow is accelerated by the swirling of the impeller 11 (streamline 3) and a side where the inflow is suppressed (streamline 4), significant turbulence is generated at the impeller inlet, and Great resistance.

The conventional sleeve-equipped fan is provided with a suction louver 12 for controlling the air volume. This suction louver 12 is suitable because the suction fluid 21 is provided so as to generate a swirling flow in the same direction as the rotation direction of the impeller 11, but it is originally intended for flow rate adjustment, and the suction louver 12 is intended. When 12 is operated in the closing direction, the flow direction of the intake fluid becomes favorable, but the inflow resistance increases and the flow rate decreases. Further, if the louver 12 is closed excessively, the streamline will be disturbed. That is, useless pressure loss occurs. Further, even when the suction louver 12 is fully opened or without a damper, the pre-rotation applied to the suction port causes turbulence or streamline collision due to its structure, and it is hard to say that it is more efficient. As described above, in the conventional blower with a sleeve, it is impossible to avoid the pressure loss when the swirling fluid is pre-swirled to allow a smooth inflow.

According to the present invention, before the suction fluid of the fluid booster with its sleeve is sucked into the bell mouth of the impeller, the swirl pre-swirl corresponding to the rotation direction of the impeller is applied to the suction fluid, thereby significantly reducing the suction loss. The purpose is to reduce.

[0007]

[Means for Solving the Problems]

 The present invention is characterized in that, in the fluid booster with sleeve, the passage of the suction fluid is formed in a spiral shape in which the winding direction is opposite to the discharge casing. In this case, it is preferable to provide guide vanes for further swirling the suctioned fluid near the end of the spiral suction port.

[0008]

[Action]

 In the present invention, the passage of the intake fluid is formed so as to give the intake fluid a pre-rotation that matches the rotation direction of the impeller. Therefore, the streamline can be rectified and the suction loss can be greatly reduced. This improves the efficiency of the blower and reduces the shaft power.

[0009]

【Example】

 FIG. 1 shows a blower 1 according to an embodiment of the present invention. The passage 2 for the suctioned fluid has a spiral shape that faces away from the discharge casing 10. That is, the suction fluid 21 flows in from the direction of the cutting line eccentric to the center of the impeller 11, and is sucked into the bell mouth of the impeller 11 while turning in the same direction as the rotation direction 13 of the impeller 11. The impeller 11 imparts a centrifugal force to the sucked fluid, ejects the fluid in the radial direction, swirls the inside of the discharge casing 10, and discharges the discharged fluid 22. In FIG. 2, the flow of the suction fluid 21 is represented by the streamline 3. The suction fluid 21 that has flowed from the suction side air tube into the air outlet of the blower flows into the bell mouth of the impeller 11 while swirling in the same direction as the rotation direction 13 of the blower 1. The passage 2 for the suctioned fluid has a spiral structure which is offset with respect to the rotation axis of the blower toward the side where a swirling flow in the same rotation direction is generated in the suctioned fluid. That is, the discharge casing 10 is formed in a spiral shape in the opposite direction.

As shown in FIG. 1, when the guide vanes 6 are provided at the end of the spiral of the intake fluid passage, the guide vanes 6 are effective means for preventing the outer streamlines from colliding with the inner streamlines. Becomes

[0011]

[Effect of the device]

 According to the present invention, it is possible to pre-swirl the inflow fluid flowing into the bellmouth of the blower impeller without using the louver damper and the suction vane. No louver damper or suction vane is used, so there is no pressure loss due to the damper. Since the streamlines are uniform, turbulence does not occur, which improves the efficiency of the blower. Further, by attaching the guide vanes to the end of the spiral of the intake fluid passage, it is possible to avoid the collision between the swirling flow and the inflow fluid.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a flow line of an intake fluid according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a conventional blower.

FIG. 4 is an explanatory diagram showing a streamline of a conventional intake gas.

FIG. 5 is an external view of a blower with a single-suction sleeve.

FIG. 6 is an outline view of a blower with a sleeve having both suctions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blower 2 Suction port (passage of suction fluid) 3 Stream line 4 Stream line 6 Guide vane 10 Discharge casing 11 Impeller 12 Louver 13 Rotation direction 21 Suction fluid 22 Discharge fluid

Claims (2)

[Scope of utility model registration request] 1. A fluid pressurizing device with sleeve according to claim 1, wherein the passage for the suctioned fluid is formed in a spiral shape in which the winding direction is opposite to that of the discharge casing. 2. The fluid booster device with sleeve according to claim 1, wherein guide vanes for further swirling the suction fluid are provided at the end of the spiral of the passage of the suction fluid.