JP2776976B2 - Swirl pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a casing for storing an impeller in a vortex pump.

[Conventional technology]

The structure near the conventional vortex pump suction part is, for example,
As described in Japanese Patent No. 46-33658, the cross-sectional area near the suction / discharge port is made larger than the cross-sectional area in the middle of the annular groove to reduce only the flow passage resistance. In addition, as disclosed in Japanese Patent Application Laid-Open No. 51-27111, air taken in from the suction port moves as a swirling flow in the air passage of the semicircular rotor air chamber and the semicircular stator and is discharged from the discharge port. In the vortex blower configured as described above, the air blower is provided with a flow path guide for projecting from the air passage along the partition wall and guiding the sucked air to the air chamber of the rotor and preventing noise propagation to the suction port side. , The fluid is blocked at the discharge side of the partition from the inner side of the air chamber of the rotor, and the fluid is finally blocked by the protrusion that has a shape that easily flows out to the air reservoir and the flow swirl center with the least flow change In order to provide a projection. The vortex blower disclosed in JP-A-49-83906, which is another prior art, has a suction opening provided near a suction port and a discharge opening provided near a discharge port. The opening and discharge opening are separated from the air passage by an inlet partition plate and discharge partition plate to prevent the occurrence of a run-up section in the air passage near the suction port and between the entrance and exit to prevent noise. The shape of the partition part, the suction port, and the discharge port was improved. However, none of the above prior arts considers a pressure loss due to a sudden change in the flow path cross-sectional area of the annular groove or a pressure recovery from dynamic pressure to static pressure. Also, no consideration has been given to noise due to collision with the partition near the discharge port.

[Problems to be solved by the invention]

As described above, in the related art, pressure loss due to a sudden change in the flow path cross-sectional area of the annular groove, and pressure recovery from dynamic pressure to static pressure have not been considered, so that a flow rate increase and a high wind pressure are obtained. There were difficulties. In addition, since no consideration has been given to the noise due to collision with the partition near the discharge port, the noise is large and low noise has been desired.

An object of the present invention is to solve the above-mentioned problems of the prior art and to increase the flow rate and pressure, and another object of the present invention is to provide a vortex pump having excellent characteristics with low noise level. .

[Means for solving the problem]

In order to achieve the above object, the present invention provides an impeller, a casing provided to face the impeller, an annular groove provided in the casing facing a blade of the impeller, In a vortex pump having a partition partitioning a part of the circumference of the groove and suction ports and discharge ports provided at both ends of the annular groove with the partition interposed therebetween, the inner surface of the annular groove is provided to the impeller. A cross-section reducing means protruding in a direction to reduce a cross-sectional area of the annular groove is provided near the suction port, and the cross-section reducing means is smoothly connected to the suction port of the annular groove, and an intermediate portion of the annular groove. In order to achieve another object of the present invention, an impeller, and a casing provided opposite to the impeller, in order to achieve another object of the present invention. Equipped, facing the impeller blades A swirl pump having an annular groove provided in the casing, a partition partitioning a part of the circumference of the annular groove, and suction ports and discharge ports provided at both ends of the annular groove across the partition. , A cross-section reducing means for projecting an inner surface of the annular groove toward the impeller to reduce a cross-sectional area of the annular groove is provided near the discharge port, and the cross-section reducing means is provided at the discharge port of the annular groove. And a vortex pump characterized in that the flow path is smoothly reduced from an intermediate portion of the annular groove.

[Action]

The partition partitions a part of the annular groove and forms a flow path from the suction port to the discharge port. The cross-section reducing means provided at the portion connected to the suction port of the annular groove guides the flow flowing from the suction port surely to pass in the vicinity of the side of the impeller to evenly friction with the impeller and air between the blades. To ensure that it is easily accessible. This makes it easier for the flow on the suction side to be given a speed from the impeller, so that the flow becomes smooth and the air volume increases. In addition, the cross-section reducing means provided at a portion connected to the discharge port of the annular groove guides the internal flow that proceeds along the casing discharged from the impeller into the impeller, turns, returns, and then heads toward the discharge port.

The collision with the partition wall is suppressed as a flow. This makes it possible to smooth the flow and suppress the generation of noise. The continuous portion provided in the cross-section reducing means smoothly increases the cross-section of the flow passage to reduce the ventilation resistance, and recovers the pressure in this section to increase the static pressure rise. Thereby, high wind pressure can be achieved. The guide plate separates the inner circumferential side and the outer circumferential side of the annular groove and smoothes the flow in the circumferential direction as well as in the radial direction.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

In the following embodiments, the vortex pump of the present invention is applied to a vortex gas pump (hereinafter, vortex blower).

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

As shown in FIGS. 1 and 5, the vortex blower of this embodiment has a casing 2 in which a blower casing 3, a motor housing 4, and a muffler casing 5 are integrally formed. The impeller 1 fastened to the main shaft 14 with a small gap g, and a motor 30 including a rotor 16 fitted to the main shaft 14 and a stator 17 fitted to the motor housing 4 are stored. A cover 15 for covering the impeller 1 is fixed to an opening of the blower casing 3 opposite to the electric motor 30. As the impeller 1, Japanese Patent Application No.
The three-dimensional blade described in Japanese Patent Application No. 212920 and Japanese Patent Application No. 1-242232 may be used. On the opposite side (opposite to the load side) of the impeller 1 of the electric motor 30, a cooling fan 18 of the electric motor 30 fastened to the main shaft 14 outside the end bracket 22 is provided.
Cooling fan cover 19 covers end bracket 18
Fixed to 22.

As shown in FIG. 2, an annular groove 3a facing the blade 1a of the impeller 1 is formed in the blower casing 3,
A muffler casing 5 containing a muffler 7 is fixed to suction ports 3b and discharge ports 3c provided at both ends of a partition wall 3d that partitions a part of the circumference of the annular groove 3a. Has a silencer casing cover 20 and a flange 21
Is provided.

Further, in the present embodiment, as shown in FIG. 3, reducing means for reducing the cross-sectional area of the annular groove 3a at a portion connected to the suction port 3b and a portion connected to the discharge port 3c of the annular groove 3a.
3e and 3f are provided.

In this embodiment, the reducing means 3e, 3f are formed by projecting the inner surface of the annular groove 3a in the direction toward the impeller 1, as shown in FIG. The reducing means 3e and 3f each have a portion connected to the suction port 3b and a portion connected to the discharge port 3c, and a portion connected smoothly to the middle portion 3g of the annular groove 3a. It is configured to have.

In the present embodiment, when the electric motor 30 is operated, the rotating shaft 14
, The internal flow is generated in the annular groove 3a and the annular groove 1b by the plurality of blades 1a provided in the annular groove 1b. As a result, the air sucked in from the suction port 3b is reduced in cross-section by the section 3d on the partition wall 3da side at the tip of the partition 3d, the intermediate section 3g of the annular groove 3a, and the section on the partition 3db side of the tip of the partition 3d. Discharge port 3 via means 3f
A continuous internal flow is formed up to c. In FIG. 1, the illustration of the partition walls 3da and 3db at the tip of the partition wall 3d is omitted.

In this embodiment, on the suction side, the internal flow is guided by the cross-section reducing means 3e so as to pass near the impeller 1, and the impeller 1
Also, due to friction with the space between the blades 1a, the speed is given from the impeller 1 and the air is sufficiently accelerated, so that the air volume can be increased.

Further, since the flow path expands smoothly from the cross-section reducing means 3e toward the intermediate portion 3g of the annular groove 3a, the increased flow velocity is reduced, and the pressure can be recovered from the dynamic pressure to the static pressure. Wind pressure can be increased.

On the discharge side, the portion of the internal flow that collides with the partition wall 3d is suppressed by the cross-section reducing means 3f, and the flow becomes smooth, so that noise is reduced.

Further, by smoothly reducing the flow path from the intermediate portion 3g of the annular groove 3a to the cross-section reducing means 3f, it is possible to suppress a pressure loss due to a rapid change in the flow path cross-section.

According to the present embodiment, the effect of increasing the suction air volume by about 10% by smoothing the suction flow by the cross-sectional area reducing means provided on the suction side, and the noise by preventing the discharge flow from colliding with the partition wall by the discharge side annular groove reduction portion. The effect of reducing the level by about 3 dB, that is, reducing the generated sound energy by 50% can be obtained.

Further, the static pressure can be recovered from the suction side cross-section reducing means to the annular groove middle portion, and the air flow resistance can be reduced from the annular groove middle portion to the discharge side cross-section reducing means, thereby increasing the pressure by about 10%.

A second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the plate 40 is provided in the annular groove 3a so as to be inclined with respect to the circumferential direction. As shown in FIGS. 6 and 7B, the plate 40 is formed so that the side facing the impeller 1 is formed flat, and the side contacting the annular groove 3a is along the bottom surface of the annular groove 3a. In this embodiment, since the plate 40 forms the suction-side cross-section reduction means and the discharge-side cross-section reduction means, it is possible to easily form the annular groove reduction portion.

A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the pressure characteristics are increased by smoothly connecting the cross-section reducing means and the annular groove middle portion 3g on the suction side. FIG. 8 shows a straight line-like connection between the cross-section reducing means 42 having a flat portion at the top and the intermediate portion 3g of the annular groove. FIG. 9 shows a first modified example of the present embodiment, in which the apex of the cross-section reducing means 43 rising from the suction port 3b in an arc shape and the intermediate portion of the annular groove
3g is smoothly and linearly tied. FIG. 10 shows a second modification of the present embodiment in which the apex of the cross-section reducing means 44 rising almost vertically from the suction port 3b and the intermediate portion 5g of the annular groove are smoothly and linearly connected. In any case, the static pressure can be recovered, and the pressure characteristics can be improved.

A third embodiment of the present invention will be described with reference to FIG. In the present embodiment, on the suction side, the section reducing means 45 and the annular groove intermediate portion 3g
When smoothly connecting, the inclination on the inner peripheral side is made smoother than the inclination on the outer peripheral side to improve the aerodynamic characteristics.

A fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, on the suction side of the annular groove 3a, a section reducing means 46 is provided, and a guide plate 47 for dividing the inside of the annular groove 3a into a plurality of sections in a direction from the inner peripheral side to the outer peripheral side is provided on the section reducing means 46. Are provided in the same direction. Thereby, the turbulence of the internal flow in the radial direction can be suppressed, and the aerodynamic characteristics can be improved. The thirteenth
FIG. 14 shows an example in which one guide plate 47 is provided, and FIG. 14 shows an example in which two guide plates 47 are provided.

A fifth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the section reducing means is constituted by a member different from the blower casing 3. 15 and 16 are examples in which the guide plate 50 is provided in the annular groove 3a as a cross-section reducing means, and FIG. 15 is an example in which the guide plate 50 is provided separately from the bottom surface of the annular groove 3a. FIG. 16 shows an example in which one end of the guide plate 50 is provided in contact with the bottom surface of the suction port 3b or the discharge port 3c of the annular groove 3a. In the present embodiment, the shape setting can be facilitated by forming the guide plate 50 with a separate member.

A sixth embodiment of the present embodiment will be described with reference to FIG. In this embodiment, a section reducing means is constituted by a guide plate 51 formed of a member separate from the blower casing 3. The guide plate 51 is formed into a shape that reduces the cross-sectional area of the annular groove 3a and smoothly guides the airflow, and is fixed to the bottom surface of the annular groove 3a by screws 52 as fixing means. In the present embodiment, the aerodynamic characteristics can be optimized by changing the fixing position so that the position can be adjusted.

A seventh embodiment of the present invention will be described with reference to FIG. In this embodiment, a guide plate 53 formed of a member separate from the blower casing 3 constitutes a section reducing means, which is rotatably supported by a support member 54, and furthermore, the amount of movement in the direction toward the impeller 1 is reduced. It is provided with a screw 55 as an adjusting means for adjusting. The guide plate 53 is formed in a shape that reduces the cross-sectional area of the annular groove 3a and smoothly guides the air flow. Screw 55
Is rotated, the amount of movement in the direction toward the impeller 1 is adjusted by the screw 52 as a fixing means of the guide plate 53, and the sectional area of the annular groove 3a changes. In this embodiment, the cross-sectional area can be adjusted, and the aerodynamic characteristics can be optimized. In the second to seventh embodiments, the configuration other than the section reducing means is the same as that of the first embodiment.

Also, the section reduction means of the third to seventh embodiments may be applied to the discharge side to achieve a low noise range.

An eighth embodiment of the present invention will be described with reference to FIGS. The present embodiment includes an impeller 60 having blades in the radial direction, particularly on the outer peripheral side, and a casing 70 provided to surround the impeller 60 and having an annular groove 70a along the outer periphery of the impeller 60. This is an example of a vortex blower. In this embodiment, the impeller 60 is provided such that the blade 60a enters the annular groove 70a. In the annular groove 70a radially the suction port 70b,
Alternatively, a discharge port 70c is provided adjacent to the partition 70d, and a section reducing means 72 is provided so as to protrude from the bottom surface of the annular groove 70a on the way from the suction port 70b or the discharge port 70c to the annular groove intermediate portion 70g. In this embodiment, the section reducing means 72 is also formed at a portion facing the side surface of the blade 60a. In this embodiment, the structure in which the flow path is reduced inward in the radial direction can improve the aerodynamic characteristics on the suction side and reduce the noise level on the discharge side.

In the above embodiments, the vortex blower has been described, but the present invention is not limited to this, and the present invention may be applied to a vortex liquid pump (Wesco pump).

〔The invention's effect〕

According to the present invention, the flow rate and the pressure can be increased, and a vortex pump having excellent characteristics can be obtained. Further, according to the present invention, a low-noise vortex pump can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the structure of a main part of a vortex blower according to a first embodiment of the present invention, FIG. 2 is a front view showing an annular groove and a section reducing means of this embodiment, and FIG. AA in Fig. 2
FIG. 4 is a perspective view showing the shape of the cross-section reducing means in this embodiment, FIG. 5 is a side cross-sectional view showing the overall configuration of the vortex blower in this embodiment, and FIG. Sectional drawing which shows the principal part of the vortex blower in 2nd Example,
FIGS. 7 (a) and 7 (b) are a plan view and a side view, respectively, showing the mounting state of the cross-section reducing means of this embodiment, and FIGS. 8 (a), (b) are each a third embodiment of the present invention. FIGS. 9 (a) and 9 (b) are a plan view and a side view showing a mounting state of the vortex blower cross-section reducing means, and FIGS. 9 (a) and 9 (b) are plan views respectively showing a mounting state of the vortex blower's cross-section reducing means in the first modified example of this embodiment. FIGS. 10 (a) and 10 (b) are a plan view and a side view, respectively, showing an attached state of a section reducing means of a vortex blower according to a second modification of the present embodiment, and FIGS.
(A) and (b) are a plan view and a side view, respectively, showing a mounting state of a cross-section reducing means of a vortex blower according to a third embodiment of the present invention. FIG. 13 (a) and 13 (b) are a plan view and a side view of a single guide plate according to the present embodiment, and FIGS. 14 (a) and (b) are respectively Plan view and side view when two guide plates are used in the present embodiment,
15 and 16 each show a cross section of a main part of a vortex blower according to a fifth embodiment of the present invention. FIG. 15 is a cross sectional view in which a guide plate is provided at a distance, and FIG. FIG. 17 is a cross-sectional view of a main part of a vortex blower according to a sixth embodiment of the present invention, and FIG. 18 is a cross-sectional view of a main part of a vortex blower according to a seventh embodiment of the present invention. Section view, section 19
FIG. 20 is a perspective view showing the shape of the cross-section reducing means of the vortex blower according to the eighth embodiment of the present invention. FIGS. 20 (a) and (b) are front cross-sectional views each showing the configuration of the main part of this embodiment. It is a side sectional view. 1: impeller, 2: casing, 3a, 7a: annular groove, 3e, 3f, 40, 42,
43,44,45,46,47,50,51,53,72: Cross-section reduction means.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Kobayashi 7-1-1 Higashi Narashino Plant, Narashino City, Chiba Prefecture Inside Hitachi, Ltd. Narashino Plant (72) Inventor Masayuki Fujio 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture In the Narashino Factory, Hitachi, Ltd. (72) Inventor Toshiharu Yoshitomi 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture In the Hitachi, Ltd. Narashino Factory (56) References JP-A-51-27111 (JP, A) 49-83906 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 23/00 F04D 5/00

Claims (6)

(57) [Claims] 1. An impeller, a casing provided opposite to the impeller, an annular groove provided in the casing facing a blade of the impeller, and an annular groove provided on a circumference of the annular groove. In a vortex pump having a partition partitioning a part and suction ports and discharge ports provided at both ends of the annular groove with the partition interposed therebetween, the inner surface of the annular groove is projected in a direction toward the impeller. A cross-section reducing means for reducing a cross-sectional area of the annular groove is provided in the vicinity of the suction port, and the cross-section reducing means is smoothly connected to the suction port of the annular groove and a flow path section is smoothly provided at an intermediate portion of the annular groove. Vortex pump characterized by a series of expansions. 2. An impeller, a casing provided to face the impeller, an annular groove provided in the casing facing a blade of the impeller, and an annular groove provided on a circumference of the annular groove. In a vortex pump having a partition partitioning a part and suction ports and discharge ports provided at both ends of the annular groove with the partition interposed therebetween, the inner surface of the annular groove is projected in a direction toward the impeller. A cross-section reducing means for reducing a cross-sectional area of the annular groove is provided in the vicinity of the discharge port, and the cross-section reducing means is smoothly connected to the discharge port of the annular groove, and a flow path section is smoothly extended from an intermediate portion of the annular groove. Vortex pump characterized by being connected so as to reduce the size. 3. The cross-section reducing means comprises a guide plate provided so as to divide the annular groove into at least two sections from an inner peripheral side to an outer peripheral side. A vortex pump as described. 4. The vortex pump according to claim 1, wherein said cross-section reducing means is formed as a member separate from said casing and is fixed inside said annular groove. 5. The apparatus according to claim 4, wherein said cross-section reducing means includes an adjusting means for adjusting an amount of movement in a direction toward said impeller, wherein said cross-sectional area of said annular groove is adjustable. Vortex pump. 6. The annular groove is provided along the outer periphery of the impeller, the impeller is arranged to rotate within the annular groove, and the cross-section reducing means is configured to cut an inner side surface of the annular groove into the annular groove. The vortex pump according to claim 1, wherein the vortex pump is formed so as to protrude in a direction toward the impeller.