JP2015190321A - Pump connection member, and multistage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump connection member and a multistage pump capable of smoothly guiding a fluid while eliminating a swirl component of the fluid among pumps.SOLUTION: A pump connection member includes a flow channel defining portion 5 disposed between a first pump 3A and a second pump 3B among pumps 3 alternately arranged in multistage at least one part between stages in the direction of a first axis O1 of a first rotating shaft 2A and a second axis O2 of a second rotating shaft 2B in parallel with each other, on the axes O1 and O2, and respectively provided with an outlet flow channel C1 for guiding a fluid F to a radial outer side of each of the axes O1 and O2 in the circumferential direction, and an inlet flow chanel C2 receiving the fluid F in the direction of the axes O1 and O2 at a central position of the axes O1 and 2, and defining a connection flow channel C3 for communicating the outlet flow channel C1 of the pump 3 (3A, 3B) at a front stage side and the inlet flow channel C2 of the pump 3 (3A, 3B) at the rear stage side. At the flow channel defining portion 5, the connection flow channel C3 extends along the plane including the first axis O1 or the second axis O2 from the outlet flow channel C1.

Description

  The present invention relates to a pump connection member provided in a multi-stage pump that pumps fluid and a multi-stage pump including the pump connection member.

  A multistage centrifugal pump is known as a multistage pump that pumps fluid. In this multistage centrifugal pump, a connection flow path for connecting the stages is provided so that the fluid discharged from the pump on the front stage side can be sucked into the pump on the rear stage side.

  By the way, in such a multistage centrifugal pump, the fluid discharged from each stage pump has a swirling component in the circumferential direction. When the fluid having the swirl component is sucked into the pump on the rear stage side as it is through the connection flow path, the fluid having the swirl component flows into the impeller in the pump on the rear stage side, and the pump efficiency May be reduced.

  Here, Patent Document 1 describes a communication channel as a connection channel between pumps in a multistage pump. The communication channel is formed so as to extend along the axis of the drive shaft, and the fluid discharged from the pump on the front stage flows through this communication channel, so that the swirl component of the fluid can be removed. There seems to be.

JP 2003-166491 A

  However, in the multistage pump described in Patent Document 1, the connection flow path (communication flow path) is connected to be orthogonal to the diffuser that guides the fluid from the pump on the front stage side. For this reason, the flow of the fluid flowing from the diffuser into the connection flow path may be disturbed, and separation or the like may occur.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pump connection member and a multistage pump that can smoothly guide fluid while removing a swirling component of fluid between pumps. .

In order to solve the above problems, the present invention proposes the following means.
The pump connecting member according to one aspect of the present invention includes a first axis of the first rotating shaft and a second axis of the second rotating shaft that are parallel to each other between at least one stage in the direction of these axes. Alternately arranged in multiple stages, an outlet channel for guiding the fluid radially outward along the circumferential direction of the first rotating shaft and the second rotating shaft, and the fluid for the first axis and the Of the pumps provided with an inlet flow path for receiving in the direction of these axes at the center position of the second axis, the first pump which is a pump arranged on the first axis, and the second shaft A connection flow path is defined which is arranged between a second pump which is a pump arranged on a line and communicates the outlet flow path of the front-stage pump and the inlet flow path of the rear-stage pump. A flow path defining section, wherein the connection flow path is located in front of the outlet flow path. It extends along the first axis or plane including the second axis.

  According to such a pump connection member, the connection flow path for connecting the pumps of each stage is formed along a plane including the first axis or the second axis. For this reason, the swirl component of the fluid is removed while the fluid discharged from the pump on the front stage flows through the connection flow path, and this fluid can flow into the pump on the rear stage. Since the first pump and the second pump are arranged in multiple stages on different axes, the relative positional relationship between the first pump and the second pump can be easily selected. Then, by appropriately selecting this relative positional relationship, it is possible to form the connection flow path in a smoothly continuous shape.

  Furthermore, the flow path defining portion in the pump connecting member may be a connecting pipe that can be attached to and detached from the first pump and the second pump.

  Thus, as a pump connection member, the connection pipe of a member different from a 1st pump and a 2nd pump can be used. Therefore, it is possible to easily form the connection flow path by manufacturing the flow path defining part separately from the pump. In addition, it is possible to change the distance between the pumps of each stage by manufacturing connecting pipes having different shapes and lengths of the connection flow paths and replacing them appropriately. Increased freedom of placement.

  The multistage pump according to one aspect of the present invention includes a first rotating shaft that rotates about a first axis, a second rotating shaft that rotates about a second axis, and the first rotating shaft. A first pump having an impeller that rotates alternately with the first rotating shaft, and rotates with the first rotating shaft, and is rotated with the second rotating shaft. A second pump having an impeller that performs the above-described operation, and the pump connection member that connects the first pump and the second pump.

  According to such a multistage pump, since the connection flow path is formed along the plane including the first axis or the second axis, the fluid discharged from the pump on the front stage flows through the connection flow path. In the meantime, the swirl component of the fluid is removed, and this fluid can flow into the pump on the rear stage side. Since the first pump and the second pump are arranged in multiple stages on different axes, the relative positional relationship between the first pump and the second pump can be easily selected. Then, by appropriately selecting this relative positional relationship, it is possible to form the connection flow path in a smoothly continuous shape.

  According to the pump connection member and the multistage pump of the present invention, the swirl component of the fluid is removed between the pumps by the connection flow path that guides the fluid along the direction of the first axis or the plane including the second axis. It is possible to smoothly guide the fluid to the pump on the rear stage side.

It is a longitudinal cross-sectional view of the multistage pump which concerns on embodiment of this invention. It is the figure which looked at the pump in the multistage pump which concerns on embodiment of this invention, and the connection flow path from the direction of the axis line, Comprising: It is AA sectional drawing of FIG.

Hereinafter, the multistage pump 1 of 1st embodiment which concerns on this invention is demonstrated.
As shown in FIG. 1, a multistage pump 1 is formed by arranging so-called centrifugal centrifugal pumps 3 (hereinafter simply referred to as pumps 3) in multiple stages. The multistage pump 1 includes a first rotating shaft 2A that rotates about a first axis O1, a second rotating shaft 2B that rotates about a second axis O2, and the first rotating shaft 2A, A pump 3 that is rotationally driven by the second rotary shaft 2B and a pump connection member 7 that connects the pumps 3 to each other are provided.

  The first rotating shaft 2A extends along the direction of the first axis O1, and is rotatable about the first axis O1 by a power source (not shown).

  The second rotary shaft 2B has substantially the same shape as the first rotary shaft 2A, extends along the direction of the second axis O2 parallel to the first axis O1, and is driven by a power source (not shown). It is rotatable about the second axis O2.

  Different power sources may be used for driving the first rotating shaft 2A and the second rotating shaft 2B, or a geared type pump using the same power source may be used.

The pump 3 is arranged in multiple stages alternately on the first axis O1 and the second axis O2 in the direction of these axes O1 and O2.
Here, the pump 3 arranged on the first axis O1 is referred to as a first pump 3A, and the pump 3 arranged on the second axis O2 is referred to as a second pump 3B.

Each first pump 3A has an impeller 11 that is fitted around the first rotary shaft 2A and rotates together with the first rotary shaft 2A, and a casing 4 that covers the impeller 11 from the outer peripheral side. .
Similarly, each second pump 3B has an impeller 11 that is fitted around the second rotary shaft 2B and rotates together with the second rotary shaft 2B, and a casing 4 that covers the impeller 11 from the outer peripheral side. doing.
And in this embodiment, the casing 4 is integrally formed so that the 1st pump 3A and the 2nd pump 3B whole may be covered in this way.

The impeller 11 rises from the disk 15 having a disk shape to one side in the direction of the first axis O1 (or the second axis O2) from the disk 15, and the first rotation shaft 2A (or the second rotation). Closed type having a plurality of blades 16 arranged apart from each other in the circumferential direction of the shaft 2B) and a cover 17 that covers the blades 16 from one side in the direction of the first axis O1 (or the second axis O2). The impeller 11 is. A main flow path C through which the fluid F can flow is formed between the blades 16 in the impeller 11.
The fluid F flows through the main channel C from the radially inner side to the outer side.
The impeller 11 may be an open type impeller 11 in which the cover 17 is not provided.

  Hereinafter, in the present embodiment, a description will be given assuming that the first pump 3 </ b> A is disposed further upstream and the second pump 3 </ b> B is disposed adjacent to the rear stage of the first pump 3 </ b> A.

  As shown in FIG. 2, the casing 4 is formed with an outlet channel C1 so as to be connected to the outlet of the main channel C in the impeller 11 of the first pump 3A. The outlet channel C1 extends radially outward along the circumferential direction of the first rotary shaft 2A toward one side in the circumferential direction (the front side in the rotational direction of the first rotary shaft 2A). . In this way, the outlet channel C1 guides the fluid F from the main channel C radially outward along the circumferential direction.

  In other words, the outlet channel C1 is provided connected to the outlet side of the first pump 3A, and the first pump 3A of the present embodiment is a so-called single spiral type spiral pump.

  Each outlet channel C1 is a so-called diffuser, and the pressure of the fluid F flowing from the main channel C is recovered by increasing the area of the channel as it goes radially outward.

  In addition, an inlet channel C2 is formed in the casing 4 so as to be continuous with the inlet of the main channel C in the impeller 11 of the second pump 3B on the rear stage side of the first pump 3A. The inlet channel C2 is connected to the inlet of the main channel C from one side in the direction of the second axis O2 and extends in the direction of the second axis O2, and the outlet flow of the first pump 3A on the preceding stage side. From the path C1, the fluid F is received in the direction of the second axis O2 at the center position of the second axis O2 via the connection channel C3 described later.

  More specifically, the inlet channel C2 is an annular channel centered on the second axis O2, and the dimension of the cross section perpendicular to the second axis O2 in the channel is the cover 17 of the impeller 11. It is larger than the inner diameter dimension. That is, the inlet channel C2 is formed so as to cover the inlet of the main channel C from the outer peripheral side.

  Furthermore, the outlet channel C1 is formed in the casing 4 so as to be connected to the outlet of the main channel C in the impeller 11 of the second pump 3B. The outlet channel C1 extends radially outward along the circumferential direction of the second rotary shaft 2B toward one side in the circumferential direction (the front side in the rotational direction of the second rotary shaft 2B). . In this way, the outlet channel C1 guides the fluid F from the main channel C radially outward along the circumferential direction.

  In other words, the outlet channel C1 is provided connected to the outlet side of the second pump 3B, and the second pump 3B of the present embodiment is a so-called single spiral type, like the first pump 3A. It has become a centrifugal pump.

  And the outlet flow path C1 provided in this 2nd pump 3B is connected to the inlet flow path C2 of the 1st pump 3A distribute | arranged to the back | latter stage side via the connection flow path C3 mentioned later. .

  In addition, although illustration is abbreviate | omitted, instead of the said inlet flow path C2, the fluid F is suck | inhaled from the exterior of the multistage pump 1 into the 1st pump 3A of the front | former stage through the suction flow path formed in the casing 4 It is. In addition, the fluid F is discharged from the second pump 3B at the last stage to the outside through a discharge passage formed in the casing 4 instead of the outlet passage C1.

Next, the pump connection member 7 will be described.
In this embodiment, the pump connection member 7 is a part of the casing 4 positioned between the first pump 3A and the second pump 3B adjacent in the direction of the first axis O1 (and the second axis O2). A connecting flow path C3 through which the fluid F can flow is formed in a part of the casing 4. That is, the pump connection member 7 of the present embodiment includes the casing 4 in a portion where the connection flow path C3 is formed as the flow path defining portion 5.

  This connection flow path C3 is arranged between the first pump 3A and the second pump 3B adjacent to each other in the direction of the first axis O1 (and the second axis O2), and the first-stage first side O3 The discharge port C1A in the outlet channel C1 of the pump 3A (or the second pump 3B) is connected to the suction port C2A in the inlet channel C2 of the second pump 3B (or the first pump 3A) on the rear stage side. And communicated with the outlet channel C1 and the inlet channel C2.

Further, the connection flow path C3 extends in the direction of the first axis O1 (or the second axis O2) from the connection portion with the discharge port C1A in the first pump 3A (or the second pump 3B) on the front stage side. It curves so that it may follow, and is connected to suction port C2A in the 2nd pump 3B (or 1st pump 3A) of the back | latter stage side.
The connection channel C3 extends along a plane including the first axis O1 or the second axis O2. That is, as shown in FIG. 2, the connection channel C3 connected to the outlet channel C1 in the first pump 3A extends along a plane including the second axis O2, and the outlet channel in the second pump 3B. The connection channel C3 connected to C1 extends along a plane including the first axis O1. And in this embodiment, as shown in FIG. 2, the connection flow path C3 is extended linearly toward the entrance flow path C2 from the exit flow path C1.

  According to such a multistage pump 1, the connection flow path C3 that connects the pumps 3 (3A, 3B) of the respective stages from the outlet flow path C1 along the plane including the first axis O1 or the second axis O2. It extends and is connected to the inlet channel C2. For this reason, while the fluid F discharged from the pump 3 on the front stage flows through the connection flow path C3, the swirl component of the fluid F can be removed and flow into the pump 3 (3A, 3B) on the rear stage. .

  Further, the first pump 3A and the second pump 3B are alternately arranged in different stages on the different first axis O1 and second axis O2, respectively. It becomes easy to select the relative positional relationship of the pump 3B.

  For this reason, when it is going to form the connection flow path C3 in the flow path definition part 5 along the 1st axis O1 and the 2nd axis O2, relative position of the 1st pump 3A and the 2nd pump 3B By appropriately selecting the relationship, the connection channel C3 can be easily formed into a smoothly continuous shape.

  According to the multistage pump 1 of the present embodiment, the connecting flow path C3 smoothly removes the swirl component of the fluid F between the pumps 3 (3A, 3B) and smoothly transfers the fluid to the pump 3 (3A, 3B) on the rear stage side. F can be guided. As a result, the pump performance can be further improved.

  The embodiment of the present invention has been described in detail with reference to the drawings, but each configuration in the embodiment and combinations thereof are examples, and additions, omissions, and configurations of the configurations are within the scope not departing from the gist of the present invention. Substitutions and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

  For example, in the above-described embodiment, the flow path defining unit 5 that forms the connection flow path C3 is provided integrally with the casing 4 together with the outlet flow path C1 and the inlet flow path C2. For example, FIG. Only the region S may be a flow path defining unit 5 that is separate from the casing 4.

  Furthermore, in this case, the flow path defining unit 5 is a connecting pipe that is a tubular member that connects the outlet flow path C1 and the inlet flow path C2 in each pump 3 (3A, 3B), and the inside of the connecting pipe is connected to the connection flow The path C3 may be used.

  The connecting pipe is detachably attached to the casing 4 in which the outlet flow path C1 and the inlet flow path C2 of each stage of the pump 3 (3A, 3B) are formed by using fastening parts such as bolts. May be.

  Further, as shown by a broken line Y in FIG. 2, the casing 4 (the flow path defining unit 5) may have a structure divided by a plane including the first axis O1 and the second axis O2. The casing 4 (the flow path defining portion 5) has a structure divided by a plane orthogonal to a plane including the first axis O1 and the second axis O2, as indicated by a broken line X in FIG. Also good. By adopting such a divided structure, the outlet channel C1, the inlet channel C2, and the connection channel C3 can be formed more easily. The dividing surface of the casing 4 (the flow path defining portion 5) is not limited to the cross section shown by the broken lines X and Y in FIG.

  Further, the connection flow path C3 extending along the plane including the first axis O1 (or the second axis O2) described above may not be applied between all the pumps 3, and some of the pumps 3 It may be applied only in between.

  Further, the pumps 3 may not be arranged alternately on the first axis O1 and the second axis O2 between all stages. In such a case, for example, after a plurality of stages are arranged on the first axis O1, a plurality of stages are arranged on the second axis O2. That is, it is only necessary that the pump 3 is alternately arranged on the first axis O1 and the second axis O2 between at least one stage.

  According to the pump connection member and the multistage pump including the pump connection member, the swirl component of the fluid is generated between the pumps by the connection flow path that guides the fluid along the direction of the first axis and the direction of the second axis. While removing, it becomes possible to guide the fluid smoothly to the pump on the rear stage side.

DESCRIPTION OF SYMBOLS 1 ... Multistage pump 2 ... Rotary shaft 2A ... First rotary shaft 2B ... Second rotary shaft 3 ... Pump 3A ... First pump 3B ... Second pump 4 ... Casing 5 ... Flow path defining part 7 ... Pump Connection member 11 ... impeller 15 ... disk 16 ... blade 17 ... cover F ... fluid O1 ... first axis O2 ... second axis C ... main channel C1 ... outlet channel C1A ... discharge port C2 ... inlet channel C2A ... Suction port C3 ... Connection channel

Claims (3)

The first axis of the first rotating shaft and the second axis of the second rotating shaft that are parallel to each other are arranged in multiple stages alternately in at least one stage in the direction of these axes, and the fluid is And the outlet channel for guiding the fluid radially outward along the circumferential direction of the second rotating shaft, and the fluid at the center position of the first axis and the second axis. Of the pumps provided with an inlet channel that accepts in the direction, a first pump that is a pump arranged on the first axis and a second pump that is a pump arranged on the second axis A flow path defining portion in which a connection flow path is defined that communicates between the outlet flow path of the front-stage pump and the inlet flow path of the rear-stage pump,
In the flow path defining unit, the connection flow path is a pump connection member extending from the outlet flow path along a plane including the first axis or the second axis.   The pump connection member according to claim 1, wherein the flow path defining unit is a connecting pipe that is detachable from the first pump and the second pump. A first rotating shaft that rotates about a first axis, and a second rotating shaft that rotates about a second axis;
A first pump having an impeller that is arranged in multiple stages in each of the first axis and the second axis alternately in the direction of these axes, and that rotates with the first rotating shaft; and A second pump having an impeller that rotates with a rotating shaft;
The pump connection member according to claim 1 or 2, wherein the first pump and the second pump are connected.
Multistage pump with

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