JP2008175084A - Reconditioned pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase pump performance in a pump device while reducing its size. <P>SOLUTION: A first partition body 6e is formed on the outer peripheral part between the front vane body 6c and the rear vane body 6d of an impeller 6. The first partition body 6e is opposed close to a casing body projection 3a. A pump chamber P is partitioned in the plate thickness direction of the impeller 6 to form first and second pump chambers P1, P2 opposed to the front and rear surfaces of the impeller 6, respectively. A communication hole 3b allowing the first and second pump chambers P1, P2 to communicate with each other is formed to guide a fluid to the first and second pump chambers P1, P2 sequentially for pressurizing in two stages. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a technical field of a regenerative pump used for pumping a liquid such as gasoline or compressing a fluid (gas) composed of a single gas such as air, nitrogen or oxygen, which is a gas mixture of a low molecular weight gas. Belongs to.

  In general, a regenerative pump is known in which an impeller built in a pump chamber has a double-blade structure in which blade bodies configured by forming a plurality of recesses on the outer periphery are formed on both front and back sides. When using such a regenerative pump to pump a low viscosity liquid, a fluid consisting of a gas mixture of low molecular weight gas such as air or nitrogen, or a fluid consisting of a single gas, especially when the fluid is a gas, If the flow rate of the inflowing gas is high, the gas discharged from the discharge port formed in the pump chamber can be pressurized (compressed) efficiently, but if the flow rate is low, sufficient pressure is applied. There is a problem that you can not.

As an improvement measure, the motor shaft provided in the gas flow path from the suction port to the discharge port is provided with two bladed impellers at two locations so as to pressurize in two stages. The one which is made to pressurize efficiently is proposed.
Japanese Utility Model Publication No. 4-125696

  However, the conventional device has a configuration in which an impeller is provided at a location in the axial direction of the motor shaft, and therefore, the pump device is enlarged in the axial direction, and there is a problem that the compactness is impaired. Since the pump chambers in which the impellers are housed are formed separately in two axial directions, the shape of the casing constituting the pump device is complicated, and it is difficult to align the axis of the impeller in each pump chamber. There is a problem that the pump performance may not be exhibited, and there are problems to be solved by the present invention.

The present invention was created with the object of solving these problems in view of the above circumstances, and the invention of claim 1 is formed by forming a plurality of recesses on the front and back surfaces of a disk, and adjacent to each other. In the regenerative pump in which the impeller in which the blade body is formed between the recesses is built in the pump chamber, the outer peripheral portion between the front and back blade bodies is closely opposed to the pump chamber peripheral surface, and the pump chamber is The first and second pump chambers are formed in the first and second pump chambers that are partitioned in the plate thickness direction and face the front and rear surfaces of the impeller, respectively, and the first and second pumps are provided with communication ports that communicate the first and second pump chambers. This is a regenerative pump configured to perform two-stage pressurization by sequentially guiding the chamber.
According to the invention of claim 2, a ring-shaped partition body that divides the radial direction into at least two parts is disposed close to and opposed to the inner surface of the pump chamber on at least one side surface of the impeller, and a plurality of inner surfaces on the inner diameter side of the partition body. A recess is formed to form a blade body between adjacent recesses, and the pump chamber facing the one side surface is divided into a plurality of pump chambers in the radial direction, and a communication port for communicating each pump chamber with an arbitrary pump chamber is provided. The regenerative pump according to claim 1, wherein the regenerative pump is provided so that fluid is sequentially guided to a plurality of pump chambers to perform multi-stage pressurization.
A third aspect of the present invention is the regenerative pump according to the second aspect, wherein the fluid passes through the pump chamber on the outer diameter side from the pump chamber on the inner diameter side of the side surface.
The invention according to claim 4 is the regenerative pump according to any one of claims 1 to 3, wherein the fluid is a gas.

According to the first aspect of the present invention, it is possible to perform a multistage compression using a single impeller, and to provide a pump device having a good compression performance while being compact.
According to the invention of claim 2, it is possible to perform further multi-stage compression using a single impeller, thereby further improving the compression performance.
According to the invention of claim 3, the compression performance can be improved without impairing the pump efficiency.
With the invention of claim 4, sufficient pressurization can be realized even with a low flow rate gas.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a regenerative pump device that is linked to a pump motor and compresses air, and a casing 2 that constitutes a pump chamber P of the pump device 1 includes a ring-shaped casing body 3, A motor side bracket 4 provided at one end (front side) of the casing body 3 in the cylinder axis direction and a pump bracket 5 provided at the other end (back side) of the casing body 3 in the cylinder axis direction. An impeller 6 is rotatably mounted in a pump chamber P constituted by the casing 2. A through hole 4 a is formed in the shaft core portion of the motor side bracket 4, and a bearing 4 b is provided in the through hole 4 a. Thus, one end of the motor shaft 7 on the motor unit side is rotatably supported. And the through-hole 6a opened in the axial center part of the said impeller 6 is comprised in the end of the motor shaft 7 which protrudes in the pump chamber P (casing 2), and it is comprised so that rotation may be carried out. Thus, the impeller 6 is set to rotate integrally with the rotation of the motor shaft 7 based on the driving of the motor unit.

  The impeller 6 is formed in a disk shape having a predetermined plate thickness, and includes a pair of front and back disk surfaces facing the brackets 4 and 5. By forming a plurality of recesses 6b in a circumferential direction with a predetermined gap, a first blade body 6c (front side) and a second blade body 66d (back side) are formed between adjacent recesses 6b on the front and back sides, respectively. Has been. And the outer peripheral part located in the plate | board thickness direction intermediate part of the impeller 6, Comprising: The outer end surface (outer peripheral surface) of the ring-shaped outer peripheral part located between the 1st, 2nd blade | wing bodies 6d and 6d of front and back is a pump. It is formed in the 1st partition 6e which adjoins and opposes the axial direction (cylinder length direction) intermediate part of the inner peripheral surface of the casing main-body part 3 which comprises the chamber P. As shown in FIG.

  On the other hand, the casing 2 is a ring-shaped first in the casing main body 3 and the motor side bracket 4 and the casing main body 3 and the pump bracket 5 which are portions facing the first and second blade bodies 6c and 6d of the impeller 6. The first and second flow paths 2a and 2b are respectively recessed, and project inward relative to the flow paths 2a and 2b, in the axially intermediate portion of the inner peripheral surface of the casing body 3. A narrow ring-shaped protrusion 3a is formed, and the protrusion 3a and the first partition 6e formed on the impeller 6 are set to face each other.

Here, the outer diameter dimension of the first partition 6e of the impeller 6 is set to be slightly smaller than the inner diameter dimension of the casing main body protrusion 3a. However, the gap is set such that the gas fed by the first and second blade bodies 6b and 6c does not communicate with each other. Thus, the pump chamber P formed by the casing 2 is divided into two axial directions (plate thickness direction of the impeller 6) by the first partition 6e, and the surface of the impeller 6 (surface on the motor side bracket 4 side). 1st pump chamber P1 constituted by the first blade body 6c and the first flow path 2a, and the back surface of the impeller 6 (surface on the pump bracket 5 side), the second blade body 6d and the second The second pump chamber P2 configured by the flow path 2b is set to be formed.
Note that a communication port 3b for communicating the first and second pump chambers P1 and P2 is formed in the projecting portion 3a of the casing body portion 3 at one location in the circumferential direction. The formation position of 3b will be described later.

  Further, among the front and back surfaces of the impeller 6, the back surface facing the pump bracket 5 is positioned on the inner diameter side of the recess 6 b for forming the second blade body 6 d formed on the outer peripheral side, and includes a plurality of By forming the recess 6f in the circumferential direction with a predetermined gap, a third blade body 6g is formed between the adjacent recesses 6f. As a result, a ring-shaped second partition body 6h is formed which is positioned between the third blade body 6g and the second blade body 6d on the back surface of the impeller 6 and faces the inner surface of the pump bracket 5 in close proximity.

  On the other hand, the pump bracket 5 constituting the casing 2 is provided with a ring-shaped third flow path 5a that is located at a position opposite to the third blade body 6g of the impeller 6. And between the 2nd flow path 2b of the pump bracket 5, and the 3rd flow path 5a, it is a state which protrudes relatively with respect to these flow paths 2b and 5a, and is a ring-shaped protrusion with a narrow radial direction width | variety. 5b is formed, and the protrusion 5b and the second partition 6h formed on the impeller 6 are set so as to face each other.

Here, the gap formed between the second partition 6h of the impeller 6 and the pump bracket protrusion 5b allows the impeller 6 to rotate with respect to the pump bracket 5, but the second and third blade bodies 6d, The gap is set so that the gas pumped by 6 g does not communicate. As a result, the second pump chamber P2 side is divided into two in the radial direction by the second partition 6h, and the second blade chamber 6g and the third flow path 5a are formed on the inner diameter side of the second pump chamber P2. Three pump chambers P3 are set to be formed.
The projecting portion 5b of the pump bracket 5 is formed with a communication port 5c for communicating the second and third pump chambers P2 and P3 at a single location in the circumferential direction. The formation position of will be described later.

  Further, the pump bracket 5 of the casing 2 is formed with a suction port 5d which is located at one place in the circumferential direction of the portion facing the third flow path 5a and communicates with the outside. In addition, the casing body 3 of the casing 2 is formed with a discharge port 3c that is located at one place in the circumferential direction of the portion facing the first flow path 2a and communicates with the outside. Here, the formation positions of the suction port 5d, the communication ports 5c, 3b, and the discharge port 3c in the circumferential direction are based on the rotational direction of the impeller 6 (motor shaft 7) (the arrow X direction in FIGS. 3 and 4). The communication port 5c formed in the third channel 5a is located on the rear side in the rotation direction of the suction port 5d, and the communication port 3b formed in the second channel is located on the rear side in the rotation direction of the communication port 5c. The discharge port 3c is formed based on the positional relationship located on the rear side in the rotation direction of the communication port 3b.

  In the pump device 1 configured as described above, the impeller 6 rotates as the motor shaft 7 rotates, so that the air sucked from the suction port 5d is first, as shown in FIG. 3, the third pump chamber P3. The first stage of pressurization is performed by being pumped through the third flow path 5a, and in this state, the third flow path 5a is guided to the second pump chamber P2 via the communication port 5c. Is set to And the air induced | guided | derived to the 2nd pump chamber P2 is pressurized by the 2nd flow path 2b, and a 2nd step pressurization is made | formed in this state via the communicating port 3b from the 2nd flow path 2b. As shown in FIG. 4, it is guided to the first pump chamber P1 and is pumped through the first flow path 2a so that a third stage of pressurization is achieved, and is discharged from the discharge port 3c. Yes.

  In the present embodiment configured as described above, when air is compressed using the pump device 1, the air is guided into the pump chamber P through the suction port 5 d formed in the pump bracket 5 of the casing 2. However, the pump chamber P is partitioned by the first partition 6e being close to and opposed to the casing main body protrusion 3a, and the first and second pump chambers P1 and P2 are formed. In the second pump chambers P1 and P2, air can be individually pressurized, and multistage compression can be performed. As a result, the pump device 1 is configured using a single impeller 6, but can perform a plurality of stages (multiple stages) of pressurizing process on the air, thereby improving the compression performance. An excellent pump device 1 can be obtained. As a result, the pump device 1 that is compact and has good compression performance can be provided without causing a problem that the pump device becomes large as in the conventional device in which two impellers are provided on the motor shaft.

  Moreover, in the case where the present invention is implemented, not only the first and second pump chambers P1 and P2 adjacent in the axial direction but also the second partition 6h with respect to one impeller 6 are pump bracket protrusions. Since the third pump chamber P3 is formed by partitioning the second pump chamber P2 in the radial direction by causing the second pump chamber P2 to be closely opposed to each other, further multi-stage compression is performed, and the compression performance can be further improved.

  Further, in this case, air is guided from the state pressurized by the third pump chamber P3 on the inner diameter side to the outer diameter side and pressurized by the second pump chamber P2, and further the axial direction of the second pump chamber P2 Since the first pump chamber P1 adjacent to the first pump chamber P1 is pressurized and pressurized, the air induction direction (flow) can be a natural flow based on the rotation of the impeller 6, and the pump efficiency can be impaired. In addition, the compression performance can be improved.

  Moreover, in this thing, since the gas of the pump apparatus 1 is air, in a general-purpose regenerative pump in which one pump chamber is formed for one impeller, sufficient pressurization is performed when the air has a low flow rate. Although it may not be possible, when the pump device 1 is used, since multi-stage pressurization is performed, sufficient pressurization can be realized even if the air has a low flow rate.

Of course, the present invention is not limited to the above-described embodiment, and may be configured as in the second embodiment shown in FIG.
Similarly to the casing of the first embodiment, the pump device of the second embodiment includes a casing 11 composed of a casing main body portion 8, a motor side bracket 9, and a pump bracket 10, and the casing 11. And an impeller 12 accommodated in the pump chamber PR formed. The impeller 12 includes first and second blade bodies 12a and 12b on the front and back surfaces of the outer peripheral portion, and third and fourth blade bodies 12c on the inner diameter side of the first and second blade bodies 12a and 12b. 12d is formed. A first partition body 12e is formed between the first and second blade bodies 12a and 12b of the impeller 12, and a second partition body 12f and a second fourth body are formed between the first and third blade bodies 12a and 12c. A third partition 12g is formed between the blades 12b and 12d.

  On the other hand, first and second flow paths 11a and 11b facing the first and second blade bodies 12a and 12b are provided on the inner circumferences of the casing body 8, the motor side bracket 9 and the pump bracket 10 constituting the casing 11, respectively. The motor side bracket 9 and the pump bracket 10 are respectively formed with third and fourth flow paths 9a and 10a facing the third and fourth blade bodies 12c and 12d. And the ring-shaped protrusion 8a between 1st, 2nd flow paths 11a, 11b, the ring-shaped protrusion 9b between 1st, 3rd flow paths 11a, 9a, 2nd, 4th flow paths 11b, 10a Between the ring-shaped protrusion 10b and the first, second, and third partitions 12e, 12f, and 12g that are close to each other, the pump chamber PR is divided into two in the axial direction. Two pump chambers PR1 and PR2 are formed, and further, the first and second pump chambers PR1 and PR2 are each divided into two in the radial direction to form third and fourth pump chambers PR3 and PR4. .

  The pump bracket 10 is formed with a suction port 10c that communicates the fourth channel 10a to the outside, and the pump racket protrusion 10b communicates between the fourth channel 10a and the second channel 11b. An opening 10d is formed, a communication port 8b that communicates between the first and second flow paths 11a and 11b is formed in the casing body protrusion 8a, and the first flow path 11c and the motor side bracket protrusion 9b are connected to each other. A communication port 9c that communicates with the third flow path 9a is formed, and the motor-side bracket 9 is formed with a discharge port 9d that communicates the third flow path 9a with the outside.

In the pump device of the second embodiment, the air sucked from the suction port 10c is guided to the fourth pump chamber PR4, and the first stage pressurization is performed by pumping the fourth flow path 10a. It is guided to the second pump chamber PR2 through the communication port 10d, is pressurized by the second stage by being pumped through the second flow path 11b, and is further guided to the first pump chamber PR1 through the communication port 8b. The third stage pressurization is performed by pumping the first flow path 11a, and finally, the fourth stage is guided to the third pump chamber PR3 through the communication port 9c and the third flow path 9a is pumped. Is configured to be pressurized.
And even in this case, air can be compressed in multiple stages by carrying out the four-stage pumping process by the rotation of one impeller 12, and excellent compression without impairing the compactness of the pump device. Can be provided.

It is a perspective view of a pump apparatus. It is a patterned sectional view explaining a pump device. It is the front view which removed the pump bracket of the pump apparatus and looked inside. It is the front view which removed the motor side bracket of the pump apparatus and looked inside. It is a patterned sectional view explaining a pump device in a second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Casing 2a 1st flow path 3 Casing main-body part 3b Communication port 3c Outlet 4 Motor side bracket 5 Pump bracket 5a 3rd flow path 5b Protrusion 5c Communication port 5d Inlet 6 Impeller 6c 1st blade 6e 1st Partition body 6g Third blade body 6h Second partition body 7 Motor shaft

Claims (4)

  In a regenerative pump in which a plurality of recesses are formed on the disk-shaped front and back surfaces, and an impeller having blades formed between adjacent recesses is provided in the pump chamber, the outer peripheral part between the front and back blades is pumped. The pump chamber is formed in the first and second pump chambers facing the inner peripheral surface and facing the front and rear surfaces of the impeller by dividing the pump chamber in the plate thickness direction, and the first and second pump chambers communicate with each other. A regenerative pump that is provided with a communication port so that fluid is sequentially guided to the first and second pump chambers for pressurization in two stages.   A ring-shaped partition body that divides the radial direction into at least two parts is made to face and oppose the inner surface of the pump chamber on at least one side surface of the impeller, and a plurality of recesses are formed adjacent to the inner diameter side of the partition body. A blade body is formed between the recesses, and the pump chamber facing the one side surface is divided into a plurality of pump chambers in the radial direction, and each pump chamber is provided with a communication port that communicates with an arbitrary pump chamber. The regenerative pump according to claim 1, wherein the regenerative pump is configured to be sequentially guided to the pump chamber to perform multi-stage pressurization.   The regenerative pump according to claim 2, wherein the fluid is configured to pass from the pump chamber on the inner diameter side of the side surface to the pump chamber on the outer diameter side.   The regenerative pump according to any one of claims 1 to 3, wherein the fluid is a gas.

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