JP2011106428A - Axial flow type blower and pump, and oblique flow type blower and pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower and a pump which can reduce noise and improve efficiency by preventing disturbance of a flow of delivered fluid. <P>SOLUTION: The blower 1 sends sucked air by rotating an impeller 30 fixed on a rotary shaft 20 extending in a casing 10. The blower 1 includes an annular shroud ring 32 so as to connect respective tip ends of a plurality of blades 31 extended from the rotary shaft 20. The casing 10 includes a shroud ring housing part 40 for housing the shroud ring 32. An inner diameter of the shroud ring housing part 40 is larger than an inner diameter of front and back parts of the shroud ring housing part 40. An outer diameter of the shroud ring 32 is smaller than an inner diameter of the shroud ring housing part 40. An inner diameter of the shroud ring 32 is not smaller than inner diameters of the front and back parts of the shroud ring housing part 40, but is approximately same. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a blower that blows sucked gas by rotating an impeller that is fixed to a rotary shaft that extends in a casing, and a pump that has the same configuration as the blower, and in particular, an axial flow type and a mixed flow type. About things.

  Blowers and pumps are used in a very wide range of industries. Therefore, the electric power consumed by the blower and the pump is enormous. This means that if the efficiency of the blower or the pump is improved, the energy saving effect can be obtained and the total power consumption can be reduced.

  Further, the noise generated by the blower and the pump is extremely large, and there is a possibility that the human body and the like are adversely affected. For this reason, it is desired to reduce the noise generated by the blower and the pump.

By the way, as a conventional blower etc., there exist some as shown in FIG.6 and FIG.7, for example.
FIG. 6 shows an axial flow fan 100, and FIG. 7 shows a mixed flow fan 200. These are composed of rotating shafts 110 and 210, impellers 120 and 220 attached to the rotating shafts 110 and 210, casings 130 and 230 containing the impellers 120 and 220, and the like. Also, it flows into the inside of the casings 130 and 230 from the inlet I side where the gas, which is a fluid, is sucked in, is pressurized by the rotation of the impellers 120 and 220, and is blown to the outside from the outlet O side of the casings 130 and 230. is there.

  As shown in the figure, in any blower, the tip of the blade of the impeller is open, and a gap is provided between the tip of the blade and the casing so that they do not contact each other.

  However, this gap causes a vortex in the flow on the tip end side of the blade and causes a reverse flow region in which the gas flow flows backward. The turbulence of the flow due to the back flow becomes a source of noise and also causes a decrease in the blowing efficiency.

  Therefore, in order to reduce the noise of the blower and at the same time improve the efficiency, it is effective to suppress the generation of a vortex in the vicinity of the tip of the blade and prevent the backflow. As a technique for preventing the occurrence of such a backflow, there is one disclosed in Patent Document 1.

JP 2001-248736 A

  The technique disclosed in Patent Document 1 relates to a propeller fan for an automobile radiator, and a rotating ring, which is a shroud ring, is attached so as to connect the tip portions of the blades. In the gap between the fixed cylinder 2 fixed to the shroud 7 and the rotary ring 1, a throttle piece S extends from the rotary ring 1 toward the fixed cylinder 2, and the reverse throttle piece from the fixed cylinder 2 toward the rotary ring 1. R extends. Thereby, the fixed effect for preventing generation | occurrence | production of a backflow has improved.

  However, such a conventional technique has a problem that the rotating ring inside the fan casing is a resistor of gas flowing in the casing, and a new vortex is easily generated separately from the backflow. It was. Further, there is a problem that the gas flows backward from the gap between the outer peripheral surface side of the rotating ring and the fan casing, which reduces the effect of the rotating ring.

  The present invention has been made paying attention to such problems of the prior art, and is capable of reducing the noise by preventing the disturbance of the flow of the fluid to be delivered and reducing the noise and improving the efficiency. It aims to provide a mixed flow type blower and pump.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] In an axial flow type or mixed flow type blower (1) for blowing sucked gas by rotating an impeller (30) fixed to a rotary shaft (20) extending in the casing (10),
The impeller (30) includes a plurality of blades (31) extending from the rotating shaft (20) and an annular shroud ring (32) provided to connect the tips of the plurality of blades (31). Have
The casing (10) has a shroud ring accommodating portion (40) in which the shroud ring (32) is accommodated, and an inner diameter of the shroud ring accommodating portion (40) is a portion before and after the shroud ring accommodating portion (40). Larger than the inner diameter of
The outer diameter of the shroud ring (32) is smaller than the inner diameter of the shroud ring accommodating portion (40), and the inner diameter of the shroud ring (32) is smaller than the inner diameter of the front and rear portions of the shroud ring accommodating portion (40). An axial flow type or mixed flow type blower (1), which is not small and has substantially the same diameter.

[2] In the casing (10), the inner diameter of the front portion of the shroud ring housing (40) is smaller than the inner diameter of the shroud ring (32).
The front part of the shroud ring accommodating part (40) has an extending part (11e) extending toward the rear part of the shroud ring accommodating part (40), and the extending part (11e) is the shroud ring ( 32) The axial flow or mixed flow type blower (1) according to [1], wherein the blower (1) overlaps with a gap between the inner peripheral surface and the inner peripheral surface.

[3] The packing (P) or the labyrinth seal for preventing the generation of air flow in the shroud ring housing (40) is provided in the shroud ring housing (40) [1] or The axial flow type or mixed flow type blower (1) according to [2].

[4] The axial flow type or mixed flow type blower according to [1], [2] or [3], wherein the casing (10) can be divided by a shroud ring accommodating portion (40). (1).

[5] An axial flow type having the same configuration as the configuration of the axial flow or mixed flow type blower (1) according to [1], [2], [3] or [4] or Mixed flow type pump.

The present invention operates as follows.
When the fan (1) is driven and the rotating shaft (20) starts rotating, the gas in front of the impeller (30) is sucked into the casing (10) by the rotating impeller (30). The sucked gas is pressurized by the rotation of the impeller (30), sent to the rear of the casing (10), and blown out of the casing (10).

  The shroud ring (32) of the impeller (30) is housed in a shroud ring housing part (40) provided in the casing (10), and the inner diameter of the shroud ring housing part (40) is the shroud ring housing part. The outer diameter of the shroud ring (32) is smaller than the inner diameter of the shroud ring accommodating portion (40), and the inner diameter of the shroud ring (32) is larger than the inner diameter of the front and rear portions of the portion (40). Since it is not smaller than the inner diameter of the front and rear portions of (40) and is substantially the same diameter, the shroud ring (32) protrudes into the casing (10) from the front and rear portions of the shroud ring accommodating portion (40), and the flow of gas It will not become a resistance. As a result, the gas can be sucked smoothly and the occurrence of backflow can be prevented, thereby reducing noise and improving efficiency.

  Further, the inner diameter of the portion of the casing (10) in front of the shroud ring accommodating portion (40), that is, the upstream portion of the sucked-in gas is made smaller than the inner diameter of the shroud ring (32), so that the shroud ring accommodating portion. An extending portion (11e) extending from the front portion of (40) toward the rear portion of the shroud ring accommodating portion (40), that is, the downstream portion of the sucked-in gas is provided, and the extending portion (11e) In the case where a gap is formed between the shroud ring (32) and the inner peripheral surface of the shroud ring (32), the gas flow in the reverse direction through the gap between the shroud ring (32) and the shroud ring accommodating portion (40) is generated. Even if the gas flow is to be generated, the gas flow flows through a gap formed between the extending portion (11e) and the inner peripheral surface of the shroud ring (32). (10) is directed in the same direction as the gas flow sucked in, so that the gas flow does not flow backward to the sucked gas flow, and noise can be further reduced and efficiency improved. it can.

  Furthermore, even if a gas flow is generated in the gap between the shroud ring (32) and the shroud ring accommodating part (40) by providing a packing (P) or a labyrinth seal in the shroud ring accommodating part (40), the generation is generated. Therefore, it is possible to further reduce noise and improve efficiency.

  When the casing (10) can be divided by the shroud ring accommodating portion (40), assembly and installation of the blower (1) can be facilitated.

  Since the pump can have the same configuration as that of the blower (1), the configuration similar to the configuration of the blower (1) can effectively reduce generated noise and be efficient. The pump can be improved.

  According to the blower according to the present invention, the backflow of the gas sucked into the casing can be prevented, so that noise generated due to the backflow generated in the casing can be reduced, and at the same time, the blowing efficiency due to the backflow It is possible to improve the efficiency by eliminating the decrease of.

It is a schematic diagram which shows the structure which looked at the air blower which concerns on the 1st Embodiment of this invention from the side surface direction. It is a front view of the air blower concerning a 1st embodiment of the present invention. It is an enlarged view which expands and shows the shroud ring accommodating part and its peripheral part in FIG. It is a schematic diagram which shows the upper half of the structure which looked at the air blower which concerns on the 2nd Embodiment of this invention from the side surface direction. It is a schematic diagram which shows the structure seen from the side surface, when the air blower which concerns on the 1st Embodiment of this invention is used as a mixed flow type air blower. It is a figure which shows the structural example of the conventional axial blower. It is a figure which shows the structural example of the conventional mixed flow fan.

Hereinafter, various preferred embodiments of the present invention will be described with reference to the drawings.
In addition, although it demonstrates taking the case of the air blower which blows the air which is gas as an embodiment of this invention, it can explain similarly about the pump which has the same structure and sucks and sends out the fluid A specific description of the pump will be omitted.

1 to 3 show a first embodiment of the present invention.
FIG. 1 is a schematic diagram illustrating a configuration of the blower according to the first embodiment as viewed from the side, and FIG. 2 is a front view of the blower according to the first embodiment. FIG. 3 is an enlarged view showing the shroud ring accommodating portion and its peripheral portion in FIG. 1 in an enlarged manner.

As shown in FIG. 1, the blower 1 according to the present embodiment is an axial blower.
In the blower 1, an impeller 30 is fixed to a rotary shaft 20 that extends in the casing 10. The impeller 30 includes a plurality of blades 31 extending from the rotation shaft 20 side in the radial direction at equal intervals. Each blade 31 is formed in a shape that sucks air, which is a gas, into the casing 10 from outside the front of the casing 10 when the rotary shaft 20 rotates in a predetermined direction.

  The plurality of blades 31 are connected at their tips by shroud rings 32. The shroud ring 32 is an annular plate-shaped plate material, and the tips of the blades 31 are fixed to the inner peripheral surface 32 a of the shroud ring 32.

  The casing 10 includes a suction portion 11 that sucks air outside the casing 10 and a guide portion 12 provided on the downstream side of the suction portion 11. The suction portion 11 is formed so that the opening diameter increases from the inner side to the outer side of the casing 10. The guide portion 12 is fixed in intimate contact with the downstream end portion 11b opposite to the upstream opening portion 11a of the suction portion 11.

  The guiding portion 12 is a cylindrical member having substantially the same inner diameter except for the upstream end portion 12a. The upstream end portion 12a of the guide portion 12 and the downstream end portion 11b of the suction portion 11 form a shroud ring accommodating portion 40 in which the shroud ring 32 is accommodated. The upstream end portion 12a of the guide portion 12 is formed with an enlarged diameter portion having a larger inner diameter than the downstream portion, and a flange 12f is formed at the end. Further, the downstream end portion 11b of the suction portion 11 is formed with an enlarged diameter portion having a larger inner diameter than the nearest upstream portion, and a flange 11f is formed at the end.

  The inner diameter of each of the enlarged diameter portion of the downstream end portion 11b and the enlarged diameter portion of the upstream end portion 12a is the same. The suction portion 11 and the guide portion 12 are joined in a close state by fixing the flange 11f and the flange 12f with bolts or the like with a packing P interposed between the flange 11f and the flange 12f. Thereby, the shroud ring accommodating part 40 which accommodates the shroud ring 32 is formed.

  The outer diameter of the shroud ring 32 accommodated in the shroud ring accommodating part 40 thus formed, that is, the diameter of the outer peripheral surface 32b is smaller than the inner diameter of the shroud ring accommodating part 40, and the front and rear parts of the shroud ring accommodating part 40 In other words, the inner diameter of the portion on the downstream side of the upstream end portion 12a of the guide portion 12 and the inner diameter of the portion on the immediate upstream side of the downstream end portion 11b of the suction portion 11 are larger. Further, the inner diameter of the shroud ring 32, that is, the diameter of the inner peripheral surface 32 a is not smaller than the inner diameter of the front and rear portions of the shroud ring accommodating portion 40, and is substantially the same diameter. Thereby, since the shroud ring 32 does not protrude toward the rotating shaft 20, the shroud ring 32 is accommodated in the shroud ring accommodating portion 40 without becoming a resistance to the air sucked in.

  In order for the entire shroud ring 32 to be accommodated in the shroud ring accommodating portion 40, the inner diameter of the shroud ring 32, that is, the diameter of the inner peripheral surface 32 a, the inner diameter of the downstream portion of the guide portion 12 and the suction portion What is necessary is just to make it the magnitude | size more than the internal diameter of the immediate upstream part of the downstream edge part 11b of the part 11. FIG. However, in order to make the air flow from the suction portion 11 to the guide portion 12 as smooth as possible, the inner diameter of the shroud ring 32 is made substantially equal to the inner diameter of the portion on the downstream side of the upstream end portion 12a of the guide portion 12. Further, it is preferable that the inner diameter of the portion immediately upstream of the downstream end portion 11b of the suction portion 11 is substantially equal to or slightly smaller.

Next, the operation will be described.
When the blower 1 is driven, the rotary shaft 20 starts to rotate in a predetermined direction. When the rotating shaft 20 rotates, the air in front of the impeller 30 is sucked into the casing 10 by the rotating impeller 30. The sucked air is pressurized by the rotation of the impeller 30, sent to the rear of the casing 10, and blown out of the casing 10.

  The air sucked from the front of the suction part 11 of the casing 10 passes through the impeller 30 from the downstream end part 11b. The outer diameter of the shroud ring 32 of the impeller 30 is smaller than the inner diameter of the shroud ring accommodating portion 40, larger than the inner diameter of the front and rear portions of the shroud ring accommodating portion 40, and the diameter of the inner peripheral surface 32a of the shroud ring 32 is also the same. The inner diameter of the portion on the downstream side of the upstream end portion 12a of the guide portion 12 and the inner diameter of the portion on the immediate upstream side of the downstream end portion 11b of the suction portion 11 are larger than the inner diameter of the shroud ring 32. The inner diameter of the shroud ring 32 is not smaller than the inner diameter of the front and rear portions of the ring accommodating portion 40, and is substantially the same diameter. Therefore, the shroud ring 32 does not hit the air flow when passing through the impeller 30 from the downstream end portion 11b. Smoothly flows through the casing 10 downstream. As a result, the sucked air flows smoothly and the occurrence of backflow can be prevented, so that noise caused by the backflow can be reduced and efficiency can be improved.

  The air that tends to flow through the gap between the inner peripheral surface of the shroud ring accommodating portion 40 and the shroud ring 32 in the shroud ring accommodating portion 40 is stopped by the packing P provided in the shroud ring accommodating portion 40, so that an air flow is generated. Therefore, it is possible to further reduce noise and improve efficiency. Further, the same effect can be obtained by providing a labyrinth seal in the shroud ring accommodating portion 40.

  Since the casing 10 can be divided into the suction part 11 and the guide part 12 by the shroud ring housing part 40, the assembly and installation of the blower 1 can be facilitated.

FIG. 4 shows a second embodiment of the present invention.
In the present embodiment, even if an air flow passing through the gap between the shroud ring housing 40 and the shroud ring 32 of the impeller 30 is generated, the direction of the flow is changed, leading to noise generation and efficiency reduction. This is different from the first embodiment in that it has a configuration that is not provided.

  In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  In the casing 10 </ b> A, the inner diameter of the front portion of the shroud ring accommodating portion 40 is smaller than the inner diameter of the shroud ring 32. That is, the downstream end portion 11 b of the suction portion 11 </ b> A has an inner diameter of the upstream portion smaller than the inner diameter of the shroud ring 32. An extending portion 11e extending toward the downstream is formed at the downstream end portion 11b. The extending portion 11 e is formed so as to overlap with the inner peripheral surface 32 a of the shroud ring 32 so as not to contact the shroud ring 32.

  Even if the air flows through the gap between the shroud ring accommodating portion 40 and the shroud ring 32 in the direction of going back the flow of air sucked from the opening portion 11a by the extending portion 11e, the flow is caused by the extending portion 11e. Since the air flow is directed in the direction of the air sucked from the air, it is ensured that the air flow going back through the gap between the shroud ring accommodating portion 40 and the shroud ring 32 flows backward to the air sucked from the opening 11a. Can be prevented. Therefore, it is possible to reliably and effectively realize reduction of noise and improvement of efficiency due to the backflow of the sucked air.

  In the above-described embodiment, the casings 10 and 10A are divided by the shroud ring accommodating portion 40, whereby the blower 1 can be easily assembled.

  Further, a labyrinth seal for preventing the generation of air flow in the shroud ring accommodating portion 40 may be provided in the shroud ring accommodating portion 40. A labyrinth seal is particularly preferable for a pump having a high pressure.

  As described at the beginning of the description, the pump can have the same configuration as that of the blower 1, so that the generated noise is effectively reduced by adopting the same configuration as that of the blower 1. And it can be set as the pump which can improve efficiency.

  In the above description, the axial blower is taken as an example, but the present invention can be similarly implemented in a mixed flow blower as shown in FIG. Therefore, it can also be implemented in a mixed flow pump.

  In the axial flow type fans 1 and 1A, the casing 10 and the casing 10A are relatively simple. However, in the mixed flow type blower 1B, the overall shape of the casing 10B including the guide portion 12B and the suction portion 11B is curved. Therefore, the configuration of the shroud ring accommodating portion 40A for facilitating assembly is different. The inner diameter of the shroud ring accommodating portion 40A is larger than the diameter of the outer peripheral surface of the shroud ring 32A, and the size of the gap between the inner peripheral surface of the shroud ring accommodating portion 40A and the outer peripheral surface of the shroud ring 32A is constant. Is formed.

  In the case of the axial-flow type blower shown in FIGS. 1 to 4, the shroud ring accommodating portion 40 is divided into two parts of the suction portions 11 and 11A and the guide portion 12, but the example shown in FIG. Then, the shroud ring accommodating portion 40A is divided into three. That is, the shroud ring accommodating portion 40A is formed by joining the suction portion 11B, the guide portion 12B, and the intermediate connecting member 41. Also in this case, the inner peripheral surface of the shroud ring 32A accommodated in the shroud ring accommodating portion 40A is a smooth surface without protruding in the rotation axis direction with respect to the front and rear portions of the shroud ring accommodating portion 40A. Is formed.

  As illustrated, the upstream end of the guide portion 12B and the downstream end of the suction portion 11B are joined via an intermediate connecting member 41. The intermediate connecting member 41 is joined and fixed to a flange formed at the end of the upstream end of the guide portion 12B and a flange formed at the end of the downstream end of the suction portion 11B, and the casing 10B. A flange 41f is formed.

  As a result, even in the mixed flow type blower 1B, assembling is easy and, as with the axial flow type blowers 1 and 1A, noise generated due to the backflow of the sucked air is effectively reduced. Efficiency can be improved.

  If the impeller incorporated in the casing is rotated and the fluid sucked in from the suction port side is sent out from the discharge port side, and if it is an axial flow type or a diagonal flow type, a blower, a pump, etc. It can be widely applied regardless of their use.

P ... Packing 1 ... Blower 1A ... Blower 1B ... Blower 10 ... Casing 10A ... Casing 10B ... Casing 11 ... Suction part 11a ... Opening part 11b ... Downstream end 11B ... Suction part 11e ... Extension part 11f ... Flange 12 ... Induction part 12a ... Upstream end portion 12B ... Guiding portion 12f ... Flange 20 ... Rotating shaft 30 ... Impeller 31 ... Vane 32 ... Shroud ring 32a ... Inner peripheral surface 32A ... Shroud ring 32b ... Outer peripheral surface 40 ... Shroud ring housing portion 40A ... Shroud Ring housing part 41 ... intermediate connecting member 41f ... flange

Claims (5)

In an axial flow type or mixed flow type blower that blows inhaled gas by rotating an impeller fixed to a rotary shaft extending in the casing,
The impeller has a plurality of blades extending from the rotation shaft and an annular shroud ring provided so as to connect the tips of the blades.
The casing has a shroud ring accommodating portion in which the shroud ring is accommodated, and an inner diameter of the shroud ring accommodating portion is larger than an inner diameter of a portion before and after the shroud ring accommodating portion,
The outer diameter of the shroud ring is smaller than the inner diameter of the shroud ring accommodating portion, and the inner diameter of the shroud ring is not smaller than the inner diameter of the front and rear portions of the shroud ring accommodating portion, and is substantially the same diameter. An axial flow type or mixed flow type blower. The casing has an inner diameter of a portion in front of the shroud ring housing portion smaller than an inner diameter of the shroud ring,
The front portion of the shroud ring accommodating portion has an extending portion extending toward a rear portion of the shroud ring accommodating portion, and the extending portion overlaps with an inner peripheral surface of the shroud ring. The axial flow type or mixed flow type blower according to claim 1, wherein the blower is an axial flow type or a mixed flow type blower.   The axial flow type or mixed flow type blower according to claim 1 or 2, wherein a packing or a labyrinth seal for preventing air flow in the shroud ring accommodating portion is provided in the shroud ring accommodating portion. .   The axial flow type or mixed flow type blower according to claim 1, 2 or 3, wherein the casing can be divided by a shroud ring accommodating portion.   An axial flow or mixed flow pump having the same configuration as that of the axial flow or mixed flow type blower according to claim 1, 2, 3 or 4.

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