JPH04124495A - Vortex flow blower - Google Patents

Abstract

PURPOSE:To obtain a compact vortex flow blower excellent in productivity by providing a cooling passage between a suction port and a discharge port in a vortex flow blower. CONSTITUTION:In line with a cooling ventilation flue 1g between a motor casing 21 and a muffler 1d, a radial cooling ventilation flue 1f is formed between the suction port 1a and a discharge port 1b of a fan casing 1. Outside air 13 is taken into a blower by a cooling fan 9, advances in the direction of the fan casing through the axial cooling ventilation flue 1g, changes its direction to enter into the radial cooling ventilation flue if upon reaching around a bearing 4a on the annular passage side, and is discharged outside after passing through between the suction port 1a and the discharge port 1b. The low temperature outside air 13 thus flows between the suction port 1a and discharge port 1b, and between the muffler part 1d and the motor 1e that are all high temperature parts so as to reduce the danger of heat degradation of insulating material, grease, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a ventilation cooling structure for a high temperature section in a vortex blower.

[Conventional technology]

In the conventional device, as described in Japanese Utility Model Application No. 49-130406, the electric motor is provided apart from the fan casing, and a ventilation passage is provided between them to cool the motor windings and bearings.

[Problem to be solved by the invention]

The above conventional technology does not give consideration to miniaturization and productivity of the device, and the motor casing and the fan casing are connected by a connecting piece across the air gap, and a heat insulating wall is placed between them. There has been a problem in that the size of the device (especially the dimension along the rotor axis of the electric motor) has increased and the number of parts has increased, reducing productivity. Our goal is to provide the following.

Another object of the present invention is to provide a vortex blower with excellent aerodynamic performance by lowering the air blowing temperature of the blower.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a fan casing having an annular flow path from an adjacent suction port to a discharge port, and a vane that is housed in the fan casing and generates a vortex flow in the annular flow path. The vortex blower includes a wheel and a driving means for the impeller, and is characterized in that a cooling passage is provided between the suction port and the discharge port.

[Effect]

The impeller housed in the fan casing is driven by a drive means to rotate, pressurizes air sucked in from the suction port, and discharges it from the discharge port. The cooling passage is provided between the suction port and the discharge port, and cools the discharge port which becomes hot due to adiabatic compression, and thermally isolates the discharge port and the suction port. As a result, high-temperature air can be cooled, and heat transfer from discharge air to suction air can be reduced, and a rise in temperature of the vortex blower can be suppressed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 18.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 7.

t! of this example! J-flow blower 1 As shown in the figure, an electric motor 1e is provided as a driving means, and this electric motor 1e
A blower impeller 2 is connected to one end, and a cooling impeller 9 is connected to the other end. Shaft 3 is impeller 2I! It is supported by a radial bearing 4a provided on the cooling impeller 9 side and a radial bearing 4b provided on the cooling impeller 9 side. The impeller 2 is housed within a fan casing 1 having a cover 5. The fan casing 1 is provided opposite to the blades of the impeller 2 and has an annular flow path 1c extending from the suction port 1a to the discharge port 1b. When the stator 1k of the electric motor 1e is excited, the rotor IJ attached to the rotating shaft 3 rotates, and the impeller 2 sucks air from the suction port 1a, pressurizes it in the annular flow path lc, and discharges it. It is discharged from the outlet 1b.

A muffler 1d for reducing noise is provided at the suction port 1a and the discharge port 1b. In this embodiment, the fan casing 1, the motor casing 21, and the silencer 1d are integrally formed by aluminum die-casting. In addition, in this embodiment, as shown in Fig. Fi1 and $2ryJ, an axial cooling ventilation passage 1 is provided between the motor casing 21 and the silencer 1d.
A radial cooling passage is formed, which is connected to the cooling air passage 1g, and is provided in the radial direction between the suction port 1a and the discharge port 1b of the fan casing 1, as shown in FIG. A ventilation path If is formed.

The outside air 13 is taken into the blower by the cooling fan 9, then passes through the axial cooling air passage 1g toward the fan casing 1, reaches the vicinity of the bearing 4a on the annular flow passage side, and then changes direction. The air enters the radial cooling air passage 1f, passes between the suction port 1a and the discharge port 1b, and is discharged to the outside.

If we consider the heat balance of the vortex blower here, the heat generation is the heat generated by the electric motor from the blower part, and the exhaust heat is heat transferred by ventilation using the cooling impeller 9 and the blower impeller 2 as the ventilation source. The one that is given is dominant.

The heat generation continuously increases as the blower operating state moves from the open state to the closed state because the shaft power continuously increases. In terms of cooling performance, the exhaust heat from the cooling impeller 9 is almost constant, while the exhaust heat from the gas discharged from the blower continuously decreases until it reaches zero at the shutoff.

As a result, the temperature of the bearing 4a rises due to the influence of the heat balance, as shown in FIG. 6, forming a curve that rises toward the deadline.

In this embodiment, the annular flow path 1 becomes hot due to the blower action.
The risk of thermal deterioration of insulators, grease, etc. is reduced by flowing low-temperature outside air 13 between the suction port 1a, the discharge port 1b, the muffler section 1d, and the electric motor 1e, which are in communication with the motor 1e and become hot.

In addition, by taking away the thermal energy generated by the blower section between the suction port la, the discharge port 1b, and the muffler section 1d, the temperature inside the annular flow path 1C1 impeller 2 is also indirectly reduced. As a result, the gas (air) in the annular flow path 1c and the impeller 2
The specific gravity of the blower increases, the energy given by the impeller 2 increases, and as a result the blower becomes aerodynamic with high static pressure.

In addition, from the viewpoint of production technology, both the axial cooling ventilation passage 1g and the radial cooling ventilation passage 1f can be integrally formed in the casing 1, and can be formed by casting, molding (plastic, aluminum die-casting, etc.). ) is advantageous when manufacturing.

Next, the characteristics of the vortex blower in this example will be explained with reference to FIGS. 5 to 7.

The surface temperature of the cooling ventilation passage of the vortex blower of this example and the air temperature after passing through the cooling ventilation passage are respectively determined as 0 point in FIG.
At point D, the temperature of the outer surface of the fan casing and the temperature of the air after passing through the outer surface of the fan casing are set at point E and E in Figure 4, respectively, and the temperature of the bearing 4a on the fan casing side is set at point 0 in Figure 1. The results of each measurement are shown in Figure 6. Moreover, the measured values at each measurement point C, D, E, and F during the shut-off operation are shown in FIG.

As shown in Fig. 5, during shut-off operation, the temperature rise value of the air passing through the cooling ventilation passage 1g, If is 65°C, which is equal to the temperature rise value of the air flowing on the outer surface of the fan casing l, which is 20°C. This shows that the cooling capacity is approximately three times greater per the same flow rate. This is because the temperature at point C on the surface of the cooling ventilation duct is much higher than the temperature at point E on the outer surface of the fan casing. On the surface, this is due to the presence of ventilation air separation from the outer surface of the casing.

As described above, in this embodiment, by providing the cooling ventilation passage 1F, a large cooling capacity can be obtained compared to when ventilation is conducted only along the outer surface of the fan casing. Due to this difference in cooling capacity, the temperature of the air inside the fan casing 1 and the impeller 2 also decreases, and as a result, the specific gravity of the air increases, so as shown in FIG. Air performance can be improved compared to others.

According to this embodiment, the radial cooling ventilation passage lf passes the air that has passed through the axial cooling ventilation passage 1g between the discharge port 1b and the suction port 1a, where the temperature rise is approximately the maximum in the present blower. As a result, excellent cooling performance can be obtained, and the annular flow path I
Since the space between the discharge port 1b and the suction port 1a, which is the cut at C, is effectively used, the distance in the axial direction can be kept small.

A first modification of this embodiment will be explained with reference to FIG. 8. In this embodiment, the length in the axial direction of the radial cooling air passage 1f is lengthened to increase the area where the cooling air comes into contact with the high temperature part. This configuration improves the thermal insulation between the air discharged from the outlet b and the air sucked into the suction port 1a, reduces the temperature rise of the suction air, and improves the cooling performance.

A second modification of this embodiment will be explained with reference to FIG. 9. In this modification, a cover 1h is provided on the axial ventilation passage 1g to form an independent duct, increasing the airflow to the radial ventilation passage 1f for cooling. It has improved performance.

A third modification of this embodiment will be explained with reference to FIGS. 10 and 11.

In this modification, a guide 1c is provided below the fan casing 1, and this guide Ic directs the cooling air blown out from the radial ventilation path f along the outer periphery of the fan casing 1 as shown by the thick arrow in FIG. f! J style blow blower 101! When installed on the mounting base indicated by the dashed line at I, the air blown out from the radial ventilation 11f hits this mounting base and changes direction, heading towards the cover 5. A baffle plate portion 5a is formed. Therefore, the airflow changes direction and flows along the outer periphery of the fan casing 1. At this time, separation of the airflow can be suppressed by the guide lc.

A modification of FIG. 4 of this embodiment will be explained with reference to FIG. 12.

In this modification, the present invention is applied to a vortex blower having a double-blade-shaped impeller 32. In the zero-blade modification, an annular flow path is also formed on the cover 5 side.

The other configurations are the same as in the first embodiment.

A second embodiment of the present invention will be explained with reference to FIG.

This embodiment has a structure in which outside air is guided to a portion closer to the bearing in order to suppress the temperature rise of the bearing 4a in the electric motor Ie and extend its life. Specifically, as shown in FIG. 13, the radial cooling ventilation passage 1f is extended close to the bearing 4a to provide a ventilation passage that supplies cooling air to the bearing 4a.

According to this embodiment, the cooling air that has passed through the axial cooling air passage 1g also cools the portion near the inner bearing 4a, and the annular flow i1
Since the bearing support part that transmits heat is cooled by heat conduction from c, it is effective to extend the life of the bearing 4a. Note that this embodiment is also similar to the first embodiment in terms of improved blower aerodynamic characteristics due to cooling and ease of production of the casing 1.21.

Furthermore, since the ventilation passage is formed within the motor casing 21, dangers such as entry of foreign objects can be prevented. The other configurations are the same as in the first embodiment.

A first modification of this embodiment will be explained with reference to FIG. 14.

In this modification, a radial cooling ventilation passage is provided all around the bearing in order to further suppress the bearing temperature and extend the life of the bearing.

In addition to the structure that can cool the support part of the bearing 4a explained in FIG. 13, this modification has a structure in which the radial direction cooling fan #1f is used for the part except for a part of the bearing support part, which increases the cooling area. By suppressing heat conduction from the support portion to the bearing 4a, the life of the bearing 4a is extended.

A second modification of this embodiment will be explained with reference to FIG. 15 and FIG. 161!1.

According to this modification, the axial ventilation passage 1g is configured with a vibrator bent into an L shape, and a high frequency component is intended to guide the cooling air from the cooling blade IIL9 directly to the bearing 4a. The wind from the cooling impeller 9 is supplied to the bearing 4a before being heated, and the bearing 4a can be effectively cooled.

A third embodiment of the present invention will be described with reference to FIG.

In this embodiment, as shown in FIG. 17, the air in the axial ventilation passage 1g is also exhausted from the motor casing 21. In this embodiment, in addition to the configuration of the second embodiment shown in FIG. 13, a frontage portion 1 m is provided on the upper surface of the motor casing 2I on the fan casing 1 side to communicate with the radial ventilation gf11f. Air in the axial ventilation passage 1g flows more easily toward the bearing 4a,
The cooling efficiency of the bearing 4a can be improved.

A first modification of this embodiment will be explained with reference to FIG. 18.

In this modification, a fan 40 is provided around the boss of the impeller 2 on the shaft 3, and is configured to perform forced air blowing and stirring. As the fan 40, a cross-flow fan, a radial fan, or the like is used.

In the above embodiments, an electric motor is integrally connected as a driving means, but the invention is not limited to this, and rotation may be transmitted from a separate electric motor by a belt or the like. Also,
The air to be blown to the radial ventilation passage 1f may be supplied from a separately installed blower.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a vortex blower that is small, has excellent productivity, and has excellent aerodynamic performance.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing the configuration of a vortex blower in the first embodiment of the present invention, Fig. 2 is a sectional view showing the AA cross section of Fig. 1, and Fig. 3 is a BB cross section of 1F and Fig. 1. 4 is a side view of the vortex blower of this embodiment, FIG. 5 is a diagram showing the temperature during shut-off operation of the vortex blower of this embodiment, and FIG. 6 is a diagram showing the air volume of the vortex blower of this embodiment. Characteristic curve diagram showing shaft power and temperature, No. 71! l is a characteristic curve diagram showing the difference in aerodynamic characteristics depending on the presence or absence of a cooling ventilation passage, FIG. 8 is a front sectional view of the first modification of this embodiment, and FIG. 9 is a diagram of the second modification of this embodiment
FIG. 10 is a side sectional view showing the main part of a modification. FIG. 11 is a front sectional view and a side view of the third modification of the present embodiment, FIG. 12 is a front sectional view of the fourth modification of the present embodiment, and FIG. 13 is a front sectional view of the fourth modification of the present embodiment. FIG. 14 is a front sectional view of the vortex blower, and FIG. 15 is a front sectional view of a first modification of the present embodiment. 16 is a front sectional view and a side sectional view of a second modification of this embodiment, FIG. 17 is a front sectional view of a vortex blower according to a third embodiment of the present invention, and FIG. 1
It is a front sectional view of a modification. l: fan casing, la: suction port, 1b: discharge port,
1c: annular channel, 1e: l! Drive means If: cooling passage;
IJ: rotor, 2: impeller, 9: cooling impeller

Claims (1)

[Claims] 1. A fan casing having an annular flow path extending from a suction port to a discharge port provided adjacent to the fan casing, and an impeller housed in the fan casing and generating a vortex flow in the annular flow path. , in a vortex blower equipped with this impeller drive means,
A vortex blower comprising a cooling passage between the suction port and the discharge port. 2. The driving means is an electric motor, and the impeller is connected to one of the shafts of the rotor, and the cooling impeller is connected to the other side of the rotor shaft, and the air blown by the cooling impeller flows through the cooling passage. 2. The vortex blower according to claim 1, wherein 3. The vortex blower according to claim 2, further comprising a ventilation passage extending from the cooling impeller to the cooling passage, the ventilation passage being formed in a duct shape. 4. Claim 2, wherein the fan casing is provided with cooling air guide means on its outer periphery, and the air discharged from the cooling passage flows along the outer periphery of the fan casing by the guide means. Whirlpool blower as described. 5. The vortex blower according to claim 2, wherein the fan casing has the annular flow passages on both sides of the impeller, and the impeller has blades facing each of the annular flow passages. . 6. A fan casing having an annular flow path from an adjacent suction port to a discharge port, an impeller housed in the fan casing and generating a vortex in the annular flow path, and driving the impeller. and a bearing provided between the electric motor and the impeller to support the shaft of the electric motor, a motor casing integrally formed with the fan casing; A ventilation passage provided in the bearing for supplying cooling air to the bearing, and a cooling passage provided between the suction port and the discharge port, the ventilation passage and the cooling passage communicating with each other. Whirlpool blower. 7. The vortex blower according to claim 6, wherein the ventilation passage is arranged around the outer periphery of the bearing. 8. The vortex blower according to claim 6, wherein the ventilation passage is configured to communicate with an exhaust port provided in the motor casing. 9. The vortex blower according to claim 8, further comprising an air blower mounted on the shaft of the electric motor in the ventilation passage. 10. A fan casing having an annular flow path from an adjacent suction port to a discharge port, an impeller housed in the fan casing and generating a vortex in the annular flow path, and a rotor shaft. A vortex blower comprising: an electric motor having one end connected to the impeller and a cooling impeller connected to the other end; and a bearing provided between the electric motor and the impeller to support the shaft of the electric motor. The bearing is disposed within a motor casing integrally formed with the fan casing, and is provided between a duct means for guiding air from the cooling impeller to the bearing, and the suction port and the discharge port. A vortex blower characterized by having a cooling passage.