JP2000337284A - Regenerative pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises caused by the intermittent collision of a fluid against a partition wall by forming a pressure rising passage leading to a discharge passage from a suction passage so that the flow of the fluid flowing into an impeller is gradually reduced toward the discharge passage side. SOLUTION: When an impeller 4 having a large number of grooves 5 circumferentially formed on both faces of an outer peripheral part and forming each space between the adjacent groove parts 5 as a blade 6, is rotated, a fluid flowing into a pressure rising passage 8 from a suction passage 1 flows into each groove part 5, flows out again to the pressure rising passage 8 in association with the rotation of the impeller 4 and flows into the root of each groove part after exchanging momentum with the fluid in the pressure rising passage 8. The fluid thereby flows spirally along the circumferential direction of the impeller 4, but since the width A of the pressure rising passage 8 is gradually narrowed on the discharge passage 2 side of the pressure rising passage 8, the quantity of the fluid flowing into the root of each groove part 5 from the pressure rising passage 8 is gradually reduced, and the generation of vortex flow is suppressed near a partition wall 9 to suppress the generation of noise caused by the collision of the fluid against the partition wall 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regeneration pump.

[0002]

2. Description of the Related Art A regenerative pump has an impeller having a large number of grooves formed on the outer periphery thereof, a pressure increasing flow path formed so as to cover the grooves along the outer periphery of the impeller, and a part of the pressure increasing flow path. This structure has a partition provided at both ends thereof to form a suction channel and a discharge channel.

In this regenerative pump, when the impeller is rotated, the fluid in each groove flows out to the pressurized flow path due to centrifugal force, and exchanges momentum with the fluid in the pressurized flow path.
It again flows into the root of each groove. In addition, the fluid flowing out of each groove also generates a tangential flow of the impeller as the impeller rotates. In other words, a vortex is generated between each groove and the pressurized flow path, and the vortex flows through the pressurized flow path in the rotation direction of the impeller. Therefore, the fluid flows in a spiral between the pressurized flow path and each groove on the outer periphery of the impeller. A flow is formed and flows toward the discharge flow path while being pressurized in the pressure increase flow path.

[0004] Such a regeneration pump has the following problems. That is, near the partition,
The fluid that has flowed out of the groove into the pressurizing flow path is blocked by the partition and heads toward the discharge flow path. This fluid flows out continuously to the impeller, but when viewed from the stationary partition, the portion of the groove where the fluid flows in the radial direction and the portion of the blade where the fluid does not flow alternately arrive. . Therefore, the vortex fluid intermittently collides with the partition, and the number of blades ×
(The number of rotations of the impeller) and noise of a frequency that is an integral multiple of this frequency.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a regenerative pump in which noise generated by intermittent collision of a fluid with a partition wall is reduced.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to the first aspect is characterized in that a boosting flow path from a suction flow path to a discharge flow path is connected to the discharge flow path. It is characterized in that the flow rate of the fluid flowing into the impeller decreases toward the flow path.

[0007] The invention described in claim 2 is characterized in that the pressurizing flow path is configured such that the width of the impeller in the thickness direction becomes narrower toward the discharge flow path.

According to a third aspect of the present invention, the step-up flow path is configured such that the radial height of the impeller increases toward the discharge flow path.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is embodied in a regenerative pump. This regenerating pump has an impeller having a large number of grooves on the outer periphery, a boosting flow path formed to cover these grooves along the outer circumference of the impeller, and both ends of the boosting flow path being cut off by partially cutting off the boosting flow path. This structure has a partition provided with a suction channel and a discharge channel forming a discharge channel. In the regeneration pump according to the present invention, the pressure increasing flow path is configured such that the flow rate of the fluid flowing into the impeller decreases toward the discharge flow path. According to this configuration, the flow rate of the fluid flowing out of each groove into the pressurizing flow path decreases as approaching the partition. Therefore,
The generation of eddy currents between the pressurized flow passage and the impeller grooves near the partition walls can be suppressed, and the flow rate of the fluid that intermittently collides with the partition walls is reduced. Can be effectively reduced.

As described above, in order to configure the pressurized flow path such that the flow rate of the fluid flowing into the impeller decreases toward the discharge flow path, for example, the width in the thickness direction of the impeller in the pressurized flow path (hereinafter referred to as “pressurized flow”). The width of the passage is referred to as “the width of the passage”). According to this configuration, the above-described noise can be effectively reduced only by changing the shape of the boosting channel.

Further, in the regenerating pump of the present invention, the width of the pressurizing flow path is narrowed toward the discharge-side flow path, and the height of the impeller in the pressurizing flow path in the radial direction (hereinafter referred to as “height of the pressurizing flow path”). Is increased toward the discharge-side flow path. More preferably, the width and height of the pressurizing flow path are set such that the cross-sectional area of the pressurizing flow path is substantially constant from the suction flow path to the discharge flow path. According to this configuration,
Since it is possible to prevent an increase in pressure loss in the pressurizing flow path,
It is possible to effectively prevent a decrease in the discharge flow rate and discharge pressure in the regeneration pump.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory longitudinal sectional view showing one embodiment of a regenerative pump according to the present invention, FIG. 2 is an explanatory exploded view of a section along an arc II-II line in FIG. 1, and FIG. 2 is an explanatory view of a cross section taken along line III-III in FIG. 2, FIG. 4 is an explanatory view of a cross section taken along line IV-IV in FIG. 2, and FIG. 5 is a view taken along line VV in FIG. FIG. 6 is an explanatory view of a cross section, and FIG.
It is explanatory drawing of the cross section along a line.

In FIG. 1, a regeneration pump is provided with a suction passage 1
And a casing 3 having a discharge channel 2.
An impeller 4 is accommodated in the casing 3.
The impeller 4 is provided with a large number of grooves 5 along the circumferential direction on both surfaces of its outer peripheral portion. A blade 6 is formed between each of the grooves 5 adjacent in the circumferential direction. The impeller 4 is driven to rotate counterclockwise about a rotation shaft 7.

In the casing 3, a pressurizing flow path 8 is provided along the outer periphery of the impeller 4. The pressurizing flow path 8 is provided so as to cover each of the grooves 5.
Further, a partition wall 9 is formed in the casing 3 to block a part of the pressurizing flow path 8 (see FIGS. 1, 2 and 6). Then, one end of the pressurizing flow path 8 blocked by the partition wall 9 is connected to the suction flow path 1, and the other end is connected to the discharge flow path 2.

As shown in FIG. 2 to FIG. 5, the width A of the impeller 4 in the thickness direction decreases as it approaches the discharge channel 2. In the illustrated embodiment, the position where the width A of the pressurizing flow channel 8 starts to be narrowed is a position D which is approximately 90 ° clockwise from the center position C of the partition wall 9. Further, as shown in FIGS. 1, 2 to 5, the height B of the impeller 4 in the radial direction increases as it approaches the discharge channel 2. In FIG. 1, the case where the height B of the pressurizing flow channel 8 is the same over the entire pressurizing flow channel 8 is indicated by a two-dot chain line for comparison. In this embodiment, the width A and the height B of the pressurizing flow path 8 are set such that the cross-sectional area of the pressurizing flow path 8 is substantially constant over the entire area of the pressurizing flow path 8. (See FIGS. 3 to 5).

Next, the operation of the regeneration pump having the above configuration will be described. First, the fluid that has flowed into the pressurizing flow path 8 from the suction flow path 1 flows into each of the grooves 5 from the pressurizing flow path 8, and from the inside of each of the grooves 5 again as the impeller 4 rotates. It flows out to the pressurizing channel 8. The fluid that has flowed out of each groove 5 into the pressurizing flow path 8 exchanges momentum with the fluid in the pressurizing flow path 8 and then flows into the root of each groove 5 again. That is, the fluid generates a vortex between each of the grooves 5 and the pressurizing flow path 8 as the impeller 4 rotates, and flows through the pressurizing flow path 8 in a tangential direction of the impeller 4. Therefore, this fluid flows helically along the circumferential direction of the impeller 4 in the pressurizing flow path 8.

The discharge passage 2 of the pressurizing passage 8
On the side, since the width A of the pressurizing flow path 8 is sequentially narrowed, the flow rate of the fluid flowing from the pressurizing flow path 8 to the root of each groove 5 gradually decreases. In addition, each of the grooves 5
Therefore, the flow rate of the fluid flowing into the root of each of the grooves gradually decreases, so that the flow rate of the fluid flowing from each of the grooves 5 to the pressurizing flow path 8 also gradually decreases. Therefore, in the vicinity of the partition wall 9, the generation of a vortex formed between each of the groove portions 5 and the pressurizing flow channel 8 is suppressed, and the continuous flow in the tangential direction of the impeller 4 becomes main. Therefore, the amount of the fluid that intermittently collides with the partition 9 is reduced, and the generation of noise due to the collision of the fluid with the partition 9 is suppressed.

Further, the discharge passage 2 of the pressurizing passage 8
On the side, the height B of the pressurizing flow path 8 is sequentially increased so that the cross-sectional area of the pressurizing flow path 8 becomes substantially constant. Can be prevented. Therefore, the fluid pressurized in the pressurized flow path 8 can flow out of the discharge flow path 2 without receiving a pressure loss due to resistance.
It is possible to effectively prevent a decrease in the discharge flow rate and discharge pressure in the regeneration pump.

In the above description, the position at which the width A of the pressurizing flow channel 8 starts to be narrowed is a position D which is approximately 90 ° clockwise from the center position C of the partition wall 9. It can be changed as appropriate.

[0020]

As described above, according to the regeneration pump of the present invention, the flow rate of the fluid flowing into the impeller decreases in the boosting flow path from the suction flow path to the discharge flow path toward the discharge flow path. Since the generation of a vortex between the pressurizing flow path near the partition and each groove of the impeller is suppressed, the flow rate of the fluid intermittently colliding with the partition can be suppressed as much as possible. Noise can be greatly reduced.

According to the regeneration pump of the present invention, the width of the pressurizing flow path is narrowed toward the discharge flow path, thereby suppressing the generation of vortices between the pressurizing flow path near the partition and each groove of the impeller. Therefore, the noise can be effectively reduced only by changing the shape of the boosting channel.

Further, according to the regeneration pump of the present invention, the width of the pressure increasing flow path is made narrower toward the discharge flow path.
Since the height of the pressurizing flow path is increased, a decrease in the discharge flow rate and a decrease in the discharge pressure can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing one embodiment of a regeneration pump according to the present invention.

FIG. 2 is a development explanatory view of a cross section taken along a line II-II in an arc of FIG. 1;

FIG. 3 is an explanatory view of a cross section taken along line III-III in FIG. 2;

FIG. 4 is an explanatory diagram of a cross section taken along line IV-IV in FIG. 2;

FIG. 5 is an explanatory diagram of a cross section taken along line VV in FIG. 2;

FIG. 6 is an explanatory diagram of a cross section taken along line VI-VI in FIG. 2;

[Description of Signs] 1 Suction flow path 2 Discharge flow path 4 Impeller 8 Booster flow path A Width in the thickness direction of impeller in booster flow path B Radial height of impeller in booster flow path

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichiro Wakana 7-F, Horie-cho, Matsuyama-shi, Ehime Miura Kogyo Co., Ltd. F-term (reference) 3H034 AA01 BB04 BB06 CC04 DD05 EE06 EE18

Claims (3)

[Claims] 1. A regeneration device characterized in that a pressurizing flow path 8 from a suction flow path 1 to a discharge flow path 2 is configured such that a flow rate of a fluid flowing into the impeller 4 decreases toward the discharge flow path 2. pump. 2. The regenerative pump according to claim 1, wherein the pressurizing flow path is configured such that a width A of the impeller in a thickness direction becomes narrower toward the discharge flow path. 3. The regeneration pump according to claim 2, wherein the pressurizing flow path 8 is configured such that a height B in a radial direction of the impeller 4 becomes higher toward the discharge flow path 2 side.