CN102762873A - Impeller, electric air blower using same, and electric cleaner using electric air blower - Google Patents

Abstract

The present invention provides an impeller, an electric blower using the impeller, and a vacuum cleaner using the electric blower. The impeller of the present invention has: a front shroud, which has an air inlet; a rear shroud, which is arranged opposite to the front shroud; a first inducer, which has a plurality of first blade parts arranged around the first hub part, The first hub part is arranged between the front shield and the rear shield; the second inducer has a plurality of second blade parts, and the second blade part is connected with the first blade part of the first inducer and provided Around the second hub portion; a plurality of blades connected to the second blade portion of the second inducer. Accordingly, the present invention can provide a high-performance, low-noise impeller capable of realizing multiple blades of the inducer.

Description

Impellers, electric blowers using impellers, and vacuum cleaners using electric blowers

technical field

The present invention relates to an impeller, an electric blower using the impeller, and a vacuum cleaner using the electric blower.

Background technique

In conventional vacuum cleaners, it is known to use an electric blower having an impeller in order to increase suction power (for example, refer to Patent Document 1).

Hereinafter, the impeller provided in the electric blower shown in patent document 1 is demonstrated using FIGS. 17-20.

FIG. 17 is a cross-sectional view of a main part of a conventional electric blower described in Patent Document 1. FIG. As shown in FIG. 17 , a conventional electric blower has a motor 7 and an impeller 121 for generating airflow provided on the rotating shaft of the motor 7. The impeller 121 is composed of a blade portion 125a and an inducer 125 composed of a substantially conical hub 125b. constitute. Furthermore, the impeller 121 is driven to rotate by the motor 7 , and the airflow discharged from the impeller 121 is rectified by the flow guide member 8 . The impeller 121 and the flow guide member 8 are contained in the fan case 9 .

Hereinafter, the structure of the impeller 121 is demonstrated using FIG. 18. FIG.

Fig. 18 is a cutaway view of the impeller of the same electric blower. As shown in FIG. 18 , the impeller 121 is composed of a flat rear shroud 122 , a substantially umbrella-shaped front shroud 123 , a plurality of blades 124 , and an air inlet 123 a provided in the center of the front shroud 123 correspondingly. The inducer 125 is made of resin. Furthermore, the blade 124 is attached to the metal rear shroud 122 and the front shroud 123 by caulking.

In addition, the inducer 125 is composed of a substantially conical hub 125b and a plurality of blade portions 125a formed on the hub 125b. Then, the airflow flowing from the intake port 123a of the front shroud 123 to the blade 124 side via the blade portion 125a of the inducer 125 is rectified by the substantially conical hub 125b.

Hereinafter, the mold structure for manufacturing the inducer 125 is demonstrated using FIG.19 and FIG.20.

19 is a plan view illustrating a method of manufacturing an inducer of an impeller of a conventional electric blower. Fig. 20 is a cross-sectional view illustrating a method of manufacturing an inducer of a conventional electric blower.

As shown in FIGS. 19 and 20 , the inducer 125 is manufactured by resin molding using a mold consisting of a slide mold 131 that slides substantially radially in the outer peripheral direction in accordance with the shape of the plurality of vane portions 125 a. , cavity 133 and core 132 movable in the up-down direction.

Here, it is conceivable to increase the number of blades 125a to shift the frequency region of high-frequency sounds to a region where human ears are insensitive. However, since the vane portion 125a of the inducer 125 has a complex three-dimensional shape, it is difficult to manufacture the vane portion 125a using a mold when the number of the vane portion 125a is increased. In addition, it is conceivable to produce the blade portion 125a by a mold method such as a casting, but the casting method is difficult to mass-produce and the cost is very high, so it is not practical.

Patent Document 1: Japanese Patent Laid-Open No. 2000-45993

Contents of the invention

The impeller of the present invention has: a front shroud, which has an air inlet; a rear shroud, which is arranged opposite to the front shroud; a first inducer, which has a plurality of first blade parts arranged around the first hub part, The first hub portion is disposed between the front guard and the rear guard; the second inducer has a plurality of second blades, the second blades are connected to the first blades of the first inducer, and It is arranged around the second hub part; a plurality of blades are connected with the second blade part of the second inducer. Accordingly, the present invention can provide a high-performance, low-noise impeller capable of realizing multiple blades of the inducer.

In addition, by using the impeller of the present invention, it is possible to provide an electric blower with low noise and excellent suction performance.

Furthermore, the vacuum cleaner of the present invention uses the above-mentioned electric blower, so that a vacuum cleaner with high suction performance and low noise can be realized.

Description of drawings

FIG. 1 is a cutaway perspective view illustrating the structure of an impeller according to Embodiment 1 of the present invention.

Fig. 2 is a perspective view of an inducer of the impeller according to Embodiment 1 of the present invention.

3 is a view taken along line 3-3 of FIG. 2 of an inducer constituting the impeller according to Embodiment 1 of the present invention.

4 is a plan view of a first inducer of the impeller according to Embodiment 1 of the present invention.

5 is a perspective view showing a second inducer of the impeller according to Embodiment 1 of the present invention.

6 is a cross-sectional view illustrating a method of manufacturing the first inducer of the impeller according to Embodiment 1 of the present invention.

7 is a plan view illustrating a method of manufacturing a second inducer of the impeller according to Embodiment 1 of the present invention.

8 is a cross-sectional view illustrating a method of manufacturing the second inducer of the impeller according to Embodiment 1 of the present invention.

9 is a view taken along line 3-3 of FIG. 2 of an inducer constituting the impeller according to Embodiment 2 of the present invention.

10 is a view of an inducer on line 3-3 in FIG. 2 of an impeller according to Embodiment 3 of the present invention.

11 is a perspective view of an inducer constituting an impeller according to Embodiment 4 of the present invention.

Fig. 12 is a perspective view of a first inducer according to Embodiment 4 of the present invention.

13 is a partial sectional view illustrating an electric blower using an impeller according to another example of Embodiment 4 of the present invention.

14A is a side view illustrating the shape of the first inducer before modification of the impeller constituting Embodiment 5 of the present invention.

14B is a side view illustrating the shape of a modified first inducer constituting the impeller according to Embodiment 5 of the present invention.

15A is a side view illustrating the shape of the first inducer before modification of the impeller constituting Embodiment 6 of the present invention.

15B is a side view illustrating the shape of a modified first inducer constituting the impeller according to Embodiment 6 of the present invention.

Fig. 16 is a diagram showing an overall configuration of a vacuum cleaner according to Embodiment 7 of the present invention.

Fig. 17 is a sectional view of an essential part of a conventional electric blower.

Fig. 18 is a cutaway view of an impeller of a conventional electric blower.

19 is a plan view illustrating a method of manufacturing an inducer of an impeller of a conventional electric blower.

Fig. 20 is a cross-sectional view illustrating a method of manufacturing an inducer of a conventional electric blower.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(implementation mode 1)

FIG. 1 is a cutaway perspective view illustrating the structure of an impeller according to Embodiment 1 of the present invention. Fig. 2 is a perspective view of an inducer of the impeller according to Embodiment 1 of the present invention. 3 is a view of an inducer on line 3-3 in FIG. 2 of the impeller according to Embodiment 1 of the present invention. 4 is a plan view of a first inducer of the impeller according to Embodiment 1 of the present invention. 5 is a perspective view showing a second inducer of the impeller according to Embodiment 1 of the present invention. In addition, since the structure of the electric blower which attached the impeller to the motor is basically the same as the structure of the conventional electric blower, it demonstrates referring FIG. 17. FIG.

Hereinafter, the impeller mounted on the motor of the electric blower will be described in detail.

As shown in Figure 1, the impeller 21 driven to rotate by the motor 7 (refer to Figure 17) is composed of a front guard 23, a rear guard 22, an inducer 25 with a first inducer 26 and a second inducer 27, and a second inducer 26. The vane 24 that inducer 27 is connected constitutes. As shown in FIG. 4, the 1st inducer 26 has the 1st hub 25b1 and the 1st blade part 25a1 formed in the outer peripheral surface of the 1st hub 25b1. Similarly, as shown in FIG. 5, the 2nd inducer 27 has the 2nd hub 25b2 and the 2nd blade part 25a2 formed in the outer peripheral surface of the 2nd hub 25b2.

In addition, the front guard 23 and the rear guard 22 are formed, for example, by sheet metal parts, and are arranged to face each other with a predetermined interval therebetween. Then, the first inducer 26 and the second inducer 27 are provided between the front shroud 23 and the rear shroud 22 , and a plurality of blades 24 are provided corresponding to the second blade portion 25 a 2 of the second inducer 27 . In addition, the blade 24 is attached to the rear shroud 22 and the front shroud 23 by, for example, caulking.

At this time, the first inducer 26 includes a first hub 25b1 and, for example, nine first blades 25a1. The first hub 25b1 is located in the center corresponding to the air inlet 23a of the front shroud 23, and has a substantially conical shape (including conical blades). shape); the first blade portion 25a1 is evenly arranged along the outer peripheral surface of the first hub 25b1. Similarly, the second inducer 27 includes a second hub 25b2 and, for example, nine second blades 25a2. The second hub 25b2 is located at the center corresponding to the air inlet 23a of the front shroud 23, and has a substantially conical shape (including conical); the second blade portion 25a2 is evenly arranged along the outer peripheral surface of the second hub 25b2. Then, the first inducer 26 and the second inducer 27 are connected to each other via the joint surface of the first blade portion 25a1 and the second blade portion 25a2 and the joint surface of the first hub 25b1 and the second hub 25b2 to constitute the inducer 25 . Now, as shown in Fig. 2 and Fig. 3, the inducer 25 made of the first inducer 26 and the second inducer 27 is connected on the plane perpendicular to the axis of the motor 7 of Fig. 17, that is, The connection is made on a surface substantially parallel (including parallel) to the rear shield 22 . Then, the first inducer 26 is provided on the intake port 23 a side of the front shroud 23 , and the second inducer 27 (see FIG. 5 ) is provided on the rear shroud 22 side. At this time, the bonding portion 28 that is the bonding surface between the first inducer 26 and the second inducer 27 is airtightly bonded, for example, with an adhesive. Thereby, leakage of the airflow from the gap between the first inducer 26 and the second inducer 27 can be prevented, and the blowing performance of the electric blower can be improved.

In addition, since the first blade portion 25a1 and the second blade portion 25a2 are used to rectify the airflow flowing from the air inlet 23a of the front shroud 23 to the blade 24 side, the first blade portion 25a1 and the second blade portion 25a2 are preferably formed is a three-dimensional surface shape.

In addition, usually, the first blade portion 25a1 of the first inducer 26 and the second blade portion 25a2 of the second inducer 27 connected to each other, the first blade portion 25a1 of the adjacent first inducer 26 and the adjacent first blade portion 25a1 2. The second blade portions 25a2 of the inducer 27 are formed so as to overlap each other. As a result, since the distance between the adjacent first blade portion 25a1 and the second blade portion 25a2 is close, the pressure distribution of the airflow in the space can be made uniform, and generation of turbulent flow and separation of the airflow from the wall surface can be prevented. As a result, the loss of fluid energy, such as an airflow, can be reduced and the impeller which improves the air blowing efficiency aimed at can be realized.

In addition, in this embodiment, although the number of sheets of the 1st blade part 25a1 and the 2nd blade part 25a2 was set as 9 sheets and demonstrated, it is not limited to this. What is necessary is just to be 7 sheets or more, for example.

The reason for this will be described below. That is, when the number of sheets of the first blade portion 25a1 and the second blade portion 25a2 is 9, for example, when the rotation speed of the motor 7 reaches about 30000rpm, the frequency of the generated high-frequency sound increases to approximately 4.5KHz . Moreover, when the number of sheets of the 1st blade part 25a1 and the 2nd blade part 25a2 is 7 sheets, the frequency of the high frequency sound which generate|occur|produces is about 3.5 KHz. Since the frequency of the above-mentioned high-frequency sound is in the low-sensitivity region of the human ear, it is a sound that is difficult to hear. Therefore, an electric blower with reduced noise can be realized.

On the other hand, when the number of the first blade portion 25a1 and the second blade portion 25a2 is 6 blades less than 7 blades, for example, when the rotational speed is about 30000r/min, the high-frequency sound generated The frequency is approximately 3.0KHz. Since the frequency of the above-mentioned high-frequency sound is within the audible range of the human ear, especially within the high-sensitivity range, it is a sound that is easy to hear. Therefore, a very harsh high-frequency sound expressed as "squeak" is formed, which gives discomfort to the user.

In addition, when the number of the first blade portion 25a1 and the second blade portion 25a2 is greater than nine, the distance between adjacent first blade portions 25a1 and between adjacent second blade portions 25a2 is too short. , so it is easy to generate turbulent flow and air flow away from the wall. As a result, the loss of fluid energy, such as air flow, increases, and the air blowing efficiency falls.

Hereinafter, the manufacturing method of manufacturing the 1st inducer 26 and the 2nd inducer 27 using a mold is demonstrated using FIGS. 6-8.

6 is a cross-sectional view illustrating a method of manufacturing the first inducer of the impeller according to Embodiment 1 of the present invention. 7 is a plan view illustrating a method of manufacturing a second inducer of the impeller according to Embodiment 1 of the present invention. 8 is a cross-sectional view illustrating a method of manufacturing the second inducer of the impeller according to Embodiment 1 of the present invention.

As shown in FIG. 6, the mold for producing the first inducer 26 shown in FIG. 4 is composed of two metal plates, namely, a core 32a and a cavity 33a. Then, for example, a resin such as polyethylene terephthalate, polybutylene terephthalate, etc. is set between the core 32a and the cavity 33a, and the resin is aligned in the direction indicated by the arrow in FIG. Pressurize to manufacture the first inducer 26 . Accordingly, the first inducer 26 can be easily molded using only two metal plate molds including the cavity 33a and the core portion 32a.

Next, as shown in FIGS. 7 and 8 , for example, when the number of second blade portions 25a2 of the second inducer 27 is nine, the mold of the second inducer 27 shown in FIG. Part 32b, mold cavity 33b, and sliding molds 31 in nine directions formed at intervals of 40 degrees. Then, for example, resin such as polyethylene terephthalate, polybutylene terephthalate, etc. is set between the core 32a and the cavity 33a, and the resin is heated in the direction indicated by the arrow in FIG. Press, and slide the slide mold 31 toward the center in the direction indicated by the arrow in FIG. 7 to process the resin and make the second inducer 27. Thereafter, the slide mold 31, the core 32b, and the cavity 33b are moved in the opening direction, and the second inducer 27 is produced. Thereby, the second inducer 27 having the second blade portion 25a2 having a complicated shape can be easily molded by using the plurality of divided slide molds 31 that slide substantially radially in the outer peripheral direction.

In the conventional inducer, forming multiple blades and forming nine blades integrally is very difficult and costly.

However, according to the present embodiment, as described above, by dividing the inducer 25 into the first inducer 26 and the second inducer 27, the first inducer 26 and the second inducer 27 can be molded separately by a mold. Afterwards, when assembling the impeller 21, the inducer 25 is produced by assembling the first inducer 26 and the second inducer 27 which are molded separately. Thereby, the inducer 25 in which the adjacent 1st blade part 25a1 and the adjacent 2nd blade part 25a2 overlap can be manufactured easily. In addition, the inducer 25 can be manufactured at low cost and with high productivity even if the number of the first blade portion 25a1 and the second blade portion 25a2 is nine or more.

In addition, in this embodiment, the example in which the 1st inducer 26 and the 2nd inducer 27 were molded and processed resin material was demonstrated, but it is not limited to this. For example, the first inducer 26 and the second inducer 27 may be produced from metal materials by methods such as die casting and sintering. Thereby, an inducer excellent in heat resistance and processing accuracy can be produced.

According to this embodiment, the impeller which has the inducer 25 which has a complex shape and a large number of blade parts can be realized easily. Thereby, the efficiency of the electric blower provided with the impeller which improves the flow of the airflow between blade parts, and the vacuum cleaner using an electric blower can be improved. In addition, by increasing the number of blades, which was difficult to achieve conventionally, it is possible to shift the frequency of high-frequency sounds generated in the blades from harsh frequency ranges to high-frequency ranges (frequency ranges in which the sensitivity of the human ear is low). Thereby, noise reduction of the electric blower provided with the impeller and the vacuum cleaner using the electric blower can be achieved.

Hereinafter, the operation of the impeller 21 configured as above will be described.

First, when the motor is driven, the impeller 21 connected to the motor rotates at high speed, and the airflow is sucked in from the air inlet 23a of the front shroud 23 of the impeller 21 . The inhaled airflow passes through the internal passage surrounded by the front shroud 23 , the inducer 25 , and the rear shroud 22 , and is extruded toward the blade 24 side. Thereafter, the extruded air flow passes through the internal passage surrounded by the front shroud 23 , the rear shroud 22 , and the blades 24 , and is discharged from the outer peripheral portion of the impeller 21 . At this time, the air flow smoothly flows laterally from the longitudinal direction of the impeller 21 along the three-dimensional curved surface formed by the first blade portion 25a1 and the second blade portion 25a2 and the first hub 25b1 and the second hub 25b2. Accordingly, it is possible to sufficiently suppress pressure loss from occurring in the impeller 21 .

In addition, an electric blower using the impeller 21 will be described below. In addition, since the electric blower of this embodiment differs only in the structure of the impeller 21 from a conventional electric blower, the electric blower of this embodiment is demonstrated with reference to FIG. 17. FIG.

The electric blower of this embodiment includes at least: the impeller 21 shown in FIG. 9. In addition, the impeller 21 has a front shroud 23 , a rear shroud 22 , an inducer 25 , and blades 24 , wherein the inducer 25 has a first inducer 26 and a second inducer 27 , and the blade 24 is connected to the second inducer 27 . At this time, as shown in FIG. 4, the first inducer 26 has a first blade portion 25a1 and a substantially conical first hub 25b1. The first blade portion 25a1 is formed on the outer peripheral surface of the first hub 25b1, and has, for example, seven more than one leaf. Similarly, as shown in FIG. 5, the second inducer 27 has a second blade portion 25a2 and a substantially conical second hub 25b2. The second blade portion 25a2 is formed on the outer peripheral surface of the second hub 25b2, for example, has 7 more than one leaf.

That is, by using the impeller 21 of the present embodiment, it is possible to reduce harsh high-frequency noise, prevent turbulent flow easily generated inside the impeller 21, and prevent air flow from detaching from the wall surface, thereby realizing an electric blower with excellent air blowing efficiency.

Moreover, by using the said electric blower, the vacuum cleaner which has high suction property with a low drive noise can be realizable.

(Embodiment 2)

9 is a view taken along line 3-3 of FIG. 2 of an inducer constituting the impeller according to Embodiment 2 of the present invention.

The impeller of this embodiment differs from Embodiment 1 in that at least one side of the joint portion 28 between the first blade portion 25a1 of the first inducer 26 and the second blade portion 25a2 of the second inducer 27 is Grooves 29 are provided on the joint face. In addition, other structures are the same as those of Embodiment 1.

As shown in FIG. 9 , the inducer 25 of the impeller 21 in this embodiment has grooves 29 provided on the joint surface along the joint portion 28 between the first blade portion 25 a 1 of the first inducer 26 and the second inducer 27 . Then, an adhesive is applied in the groove 29 to bond the first blade portion 25 a 1 of the first inducer 26 and the second inducer 27 . At this time, since the adhesive flows along the grooves 29, the adhesive can be applied efficiently and adhesion workability can be improved. In addition, since the surface tension acts strongly on the adhesive coated on the groove 29, it is possible to prevent the adhesive from overflowing to the surfaces of the first blade portion 25a1 and the second blade portion 25a2 where air flow flows. Thereby, it is possible to prevent deterioration of air blowing performance due to a decrease in the surface roughness of the surfaces of the first blade portion 25a1 and the second blade portion 25a2 where the air flow flows (a slight height difference caused by adhesive adhesion). reduce.

In addition, in this embodiment, the example in which the groove 29 is provided on the joint surface of either one of the first vane portion 25a1 side of the first inducer 26 and the second vane portion 25a2 side of the second inducer 27 has been described. , but not limited thereto, the groove 29 may also be provided on the joint surfaces on both sides.

In addition, in this embodiment, the example in which the groove 29 is provided on the joint surface of either one of the first vane portion 25a1 side of the first inducer 26 and the second vane portion 25a2 side of the second inducer 27 has been described. , but not limited to this. For example, it is also possible to adopt a structure in which a groove 29 is provided on any one of the joint surface of the first blade portion 25a1 side of the first inducer 26 and the second blade portion 25a2 side of the second inducer 27, and the On the joint surface on the other side, a protrusion for fitting the groove 29 is provided, and the first vane portion 25a1 of the first inducer 26 is connected to the second vane portion 25a2 of the second inducer 27 by fitting the groove and the protrusion. . Thereby, there is no need to consider spillage of the adhesive or the like, and productivity is improved.

In addition, in this embodiment, the example in which the groove 29 is provided on the joint surface of either one of the first vane portion 25a1 side of the first inducer 26 and the second vane portion 25a2 side of the second inducer 27 has been described. , but not limited to this. For example, as shown in FIG. 9, along the joint portion 28 between the first blade portion 25a1 of the first inducer 26 and the second blade portion 25a2 of the second inducer 27 and in the direction opposite to the direction of rotation of the impeller 21 ( On the left direction in FIG. 9 , grooves 29 a are further provided on the surface side of the first blade portion 25 a 1 or the second blade portion 25 a 2 on which the air flow flows. In this way, it is possible to configure a structure with no height difference in the portion on the side of the rotation direction (rightward direction in FIG. 9 ) of the first blade portion 25a1 or the second blade portion 25a2 of the impeller 21 that greatly affects the air blowing performance. The surface (pressure surface) can prevent the reduction of air supply performance.

(Embodiment 3)

10 is a view taken along the line 3-3 of FIG. 2 of the inducer constituting the impeller according to Embodiment 3 of the present invention.

The impeller of the present embodiment differs from Embodiment 2 in that the joint of at least one side of the joint portion 28 between the first hub 25b1 of the first inducer 26 and the second hub 25b2 of the second inducer 27 is different from that of the second embodiment. Grooves 29b are provided on the surface. In addition, other structures are the same as those of Embodiment 2.

As shown in FIG. 10 , the inducers 25 of the impeller 21 in this embodiment are scattered or distributed along the joint surface of the joint portion 28 between the first hub 25 b 1 of the first inducer 26 and the second inducer 27 . The groove 29b is provided.

Then, when the first inducer 26 and the second inducer 27 are bonded together, from the outer peripheral portion of the first blade portion 25a1 and the second blade portion 25a2 to the inner peripheral portion of the first blade portion 25a1 and the second blade portion 25a2 The flowing adhesive flows into and is stored in the groove 29b provided in the joint portion 28 of the first hub 25b1 or the second hub 25b2. This prevents the adhesive from flowing into the root portion 30 between the first hub 25b1 and the first blade portion 25a1 or between the second hub 25b2 and the second blade portion 25a2. As a result, the reduction in the air blowing performance due to the reduction of the surface roughness of the surface of the first blade part a1 and the second blade part 25a2 where the air flow flows (slight height difference caused by adhesive adhesion) is prevented. reduce.

(Embodiment 4)

11 is a perspective view of an inducer constituting an impeller according to Embodiment 4 of the present invention. Fig. 12 is a perspective view of a first inducer according to Embodiment 4 of the present invention.

The impeller 21 of this embodiment differs from Embodiment 1 in that the ring part 19 which connects the some 1st blade part 25a1 of the 1st inducer 26 is provided. In addition, other structures are the same as those of Embodiment 1.

As shown in Fig. 11 and Fig. 12, a plurality of (for example, nine pieces) first blade parts 25a1 of the first inducer 26 of the impeller 21 in this embodiment are connected by using, for example, a metal ring part 19 to constitute the first blade part 25a1. Inducer 26.

Thereby, the mechanical strength of the first inducer 26 can be improved. As a result, warpage and deformation of the first inducer 26 are prevented, and the first inducer 26 having high precision and excellent shape stability can be realized.

In addition, in this embodiment, although the example which formed the ring part 19 with a metal material was demonstrated, it is not limited to this. For example, the ring portion 19 may be integrally formed on the upper outer peripheral end portion of the first inducer 26 with the first blade portion 25a1 and the first hub 25b1 of the first inducer 26 . Thereby, the same effect as above can be obtained, and productivity can be improved by integral molding.

In addition, in this embodiment, although the example which formed the ring part 19 only in ring shape was demonstrated, it is not limited to this. For example, as shown in FIG. 13 , the protrusion 20 may be provided on the upper surface (the side opposite to the surface on which the first blade portion 25 a 1 is provided) of the ring portion 19 . It should be noted that, when the impeller 21 is mounted on the electric blower, the protruding portion 20 exerts a good effect.

Hereinafter, an electric blower equipped with another example of an impeller constituted by the first inducer 26 having the protrusion 20 will be described below using FIG. 13 .

13 is a partial sectional view illustrating an electric blower using an impeller according to another example of Embodiment 4 of the present invention.

As shown in FIG. 13 , on the upper surface of the ring portion 19 of the first inducer 26 of the impeller 21 , for example, an acute-angled protrusion 20 is formed. Then, the inducer 26 is fixed to the sealing portion 11 by deforming the sealing portion 11 contained in the fan case 9, for example, made of an elastic body by means of the protrusion 20, and the protrusion 20 bites into the sealing portion 11. Section 11 on. At this time, since the ring portion 19 of the first inducer 26 has increased mechanical strength, the projection portion 20 and the seal portion 11 can be pressed with a uniform load to connect the projection portion 20 and the seal portion 11 . Thereby, the protrusion part 20 and the sealing part 11 can be connected with high airtightness. As a result, leakage of the airflow flowing into the impeller can be prevented, and an electric blower that does not lower the blowing efficiency and a vacuum cleaner using the electric blower can be realized.

(implementation mode 5)

Hereinafter, the inducer constituting the impeller according to Embodiment 5 of the present invention will be described with reference to the drawings.

The inducer according to Embodiment 5 is configured such that the inclination angle of the first vane portion of the first inducer is different from the inclination angle of the second vane portion of the second inducer.

That is, Embodiment 5 is an embodiment which responds to the case where the air volume and rotation speed requested|required of an electric blower are changed with the simple structure of an inducer.

14A is a side view illustrating the shape of the first inducer before modification of the impeller constituting Embodiment 5 of the present invention. 14B is a side view illustrating the shape of a modified first inducer constituting the impeller according to Embodiment 5 of the present invention.

First, as shown in FIG. 14A , when the performance of the electric blower is designed based on the air volume Q1 and the rotation speed N1 , the inclination angle of the first vane portion 25a1 of the first inducer 26 that exhibits the highest efficiency is set to θ1.

Next, a case where the performance of the electric blower is changed to the air volume Q2 and the rotational speed N2 will be described below as an example.

At this time, as shown in FIG. 14B, in the case of the impeller of this embodiment, in order to realize the air volume Q2 and the rotation speed N2, the inclination angle of the first blade portion 25a1 of the first inducer 26 is changed to θ2, and the first inducer The first blade portion 25a1 of the wheel 26 is joined to the second blade portion 25a2 of the second inducer 27 formed at an inclination angle θ1. In addition, since in Embodiment 1, as described with the 9-piece structure, the interval formed by the first blade portion 25a1 and the second blade portion 25a2 is fixed at 40 degrees, so even if the first inducer 26 The inclination angle of the vane part 25a1 is changed to θ2, and the second vane part 25a2 formed at the inclination angle θ1 of the second inducer 27 can be easily connected. Therefore, only by changing the inclination angle of the first vane portion 25a1 of the first inducer 26, the performance of the electric blower after the change can be realized.

On the other hand, conventionally, if the impeller structure is used, in the case of changing the inclination angle θ1 of the blade portion of the inducer 25 to θ2, a new inducer 25 must be developed. Productivity, difficult to achieve low cost.

However, according to the present embodiment, predetermined performance can be realized only by changing the rotation angle of the first vane portion 25 a 1 of the first inducer 26 which has the greatest influence on the characteristics of the inducer 25 . Therefore, since the above object can be achieved only by remaking the mold of the first inducer 26, high productivity and low cost can be easily realized.

As described above, according to the present embodiment, even when the design of the electric blower is changed, it is not necessary to redesign the entire inducer, for example, only changing the die of the first inducer can cope with this situation. Accordingly, in the impeller, the electric blower using the impeller, and the vacuum cleaner using the electric blower, it is possible to reduce mold costs, development man-hours, and development time.

In addition, in this embodiment, an example was described in which the mold of the first inducer was changed, but the mold of the second inducer may be changed to obtain the same effect.

(Embodiment 6)

Hereinafter, the inducer constituting the impeller according to Embodiment 6 of the present invention will be described with reference to the drawings.

The present embodiment is an embodiment in which the air volume and the rotational speed required for the electric blower are changed with a simple structure of the inducer.

15A is a side view illustrating the shape of the first inducer before modification of the impeller constituting Embodiment 6 of the present invention. 15B is a side view illustrating the shape of a modified first inducer constituting the impeller according to Embodiment 6 of the present invention.

First, as shown in FIG. 15A , when the performance of the electric blower is designed based on the air volume Q1 and the rotational speed N1, the height of the first vane portion 25a1 of the first inducer 26 that exhibits the highest efficiency is H1.

Next, a case where the performance of the electric blower is changed to the air volume Q2 and the rotational speed N2 will be described below as an example.

At this time, as shown in FIG. 15B, in the case of the impeller of this embodiment, in order to realize the air volume Q2 and the rotation speed N2, the height of the first blade portion 25a1 of the first inducer 26 is changed to H2, and the first inducer The first blade portion 25a1 of the wheel 26 is joined to the second blade portion 25a2 of the second inducer 27 . Thereby, only by changing the inclination angle of the 1st blade part 25a1 of the 1st inducer 26, the performance of the electric blower after a change can be realized.

On the other hand, conventionally, if the impeller structure is used, when changing the height H1 of the blade portion of the inducer 25 to H2, it is necessary to develop a new inducer 25. Therefore, it is difficult to improve productivity because a new mold is required. , It is difficult to achieve low cost.

However, according to the present embodiment, predetermined performance can be realized only by changing the height of the first vane portion 25 a 1 of the first inducer 26 which exerts the greatest influence on the characteristics of the inducer 25 . Therefore, since the above object can be achieved only by remaking the mold of the first inducer 26, high productivity and low cost can be easily realized.

As described above, according to the present embodiment, even when the design of the electric blower is changed, it is not necessary to redesign the entire inducer, for example, only changing the die of the first inducer can cope with this situation. In the impeller, the electric blower using the impeller, and the vacuum cleaner using the electric blower, mold costs, development man-hours, and development time can be reduced.

in addition. In this embodiment, an example in which the mold of the first inducer is changed is described, but the mold of the second inducer can also be changed to obtain the same effect.

(Embodiment 7)

Fig. 16 is a diagram showing an overall configuration of a vacuum cleaner according to Embodiment 7 of the present invention.

In FIG. 16 , the vacuum cleaner of this embodiment has a vacuum cleaner main body 34 , a hose 35 communicating with the vacuum cleaner main body 34 , an extension tube 36 communicating with one end of the hose 35 , and an operating handle provided at the end of the hose 35 . 37 and the ground suction tool 38 that communicates with one end of the extension pipe 36. An electric blower 39 having an impeller for generating suction force is incorporated in the cleaner 34 . Then, on the upstream side of the electric blower 39, there is a dust collection chamber 40 storing the suctioned dust.

Then, in this embodiment, as the electric blower 39 , an electric blower having any of the impellers 21 described in the first to sixth embodiments described above is used.

Hereinafter, the operation|movement of the vacuum cleaner comprised as mentioned above is demonstrated.

First, the user holds the operating handle 37 and starts to operate the vacuum cleaner. Then, a suction force is generated from the electric blower 39, and the dust is sucked together with the air by the floor suction tool 38 moving on the floor. The suctioned dust flows into the dust collection chamber 40 through the extension pipe 36 and the hose 35 together with the air, and is separated in the dust collection chamber 40 . The separated dust is stored in the dust collecting chamber 40, and only the air is sucked by the electric blower. The sucked air passes through the inside of the electric blower 39 and then passes through the inside of the cleaner 34 to be discharged to the outside of the cleaner 34 .

According to this embodiment, by using the electric blower 39 equipped with the improved blowing efficiency of the present invention, it is possible to realize a vacuum cleaner which has high suction performance and does not generate harsh noise, and which is comfortable and excellent in operability.

Industrial availability

The present invention is useful for electric appliances such as vacuum cleaners using electric blowers, household appliances, industrial machines, etc., which seek to increase air volume and rotational speed efficiency and reduce noise.

Explanation of reference signs

7. Electric motor; 8. Flow guide member; 9. Fan box; 19. Ring part; 20. Protruding part; 21, 121, impeller; 22, 122, rear shield; 23, 123, front shield; , air inlet; 24, 124, blade; 25, 125, inducer; 25a1, first blade part; 25a2, second blade part; 25b1, first hub; 25b2, second hub; 26, first inducer ; 27, the second inducer; 28, joint; 29, 29a, 29b, groove; 30, root; 31, 131, sliding mold; 32a, 32b, 132, core; 33a, 33b, 133, mold cavity; 34. The main body of the vacuum cleaner; 35. The hose; 36. The extension tube; 37. The operating handle; 38. The suction tool for the ground; 39. The electric blower; 40. The dust collection chamber;

Claims (15)

1. An impeller wherein, The impeller has: a front shroud having air intakes; a rear shield, which is arranged opposite to the above-mentioned front shield; a first inducer having a plurality of first blade portions disposed around a first hub portion disposed between the front shroud and the rear shroud; A second inducer having a plurality of second blades connected to the first blades of the first inducer and arranged around the second hub; A plurality of blades connected to the second blade portion of the second inducer. 2. The impeller of claim 1, wherein: The first blade portion of the first inducer and the second blade portion of the adjacent second inducer overlap each other. 3. The impeller of claim 1, wherein: The number of the first blade portion of the first inducer and the second blade portion of the second inducer is at least seven. 4. The impeller of claim 1, wherein: The first inducer and the second inducer are connected via a joint. 5. The impeller of claim 4, wherein: A groove is provided on the above-mentioned engaging portion. 6. The impeller of claim 5, wherein: Grooves are provided on the surface on the opposite side to the rotation direction of the first blade portion or the second blade portion. 7. The impeller of claim 4, wherein: The joint portion is a connection surface between the first blade portion of the first inducer and the second blade portion of the second inducer. 8. The impeller of claim 7, wherein: The connecting surface further includes a connecting surface between the first hub portion and the second hub. 9. The impeller of claim 1, wherein: The plurality of first vane portions of the first inducer are connected to each other by a ring portion. 10. The impeller of claim 9, wherein: The first inducer is integrally formed with the ring portion. 11. The impeller of claim 9, wherein: A protrusion is provided on the outer periphery of the ring portion. 12. The impeller of claim 1, wherein: The inclination angle of the first blade portion of the first inducer is different from the inclination angle of the second blade portion of the second inducer. 13. The impeller of claim 1, wherein: The axial height of the first vane portion of the first inducer is different from the axial height of the second vane portion of the second inducer. 14. An electric blower wherein, The electric blower has the impeller according to claim 1 . 15. A vacuum cleaner, wherein This vacuum cleaner uses the electric blower described in claim 14 .

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