JP6017321B2 - Double suction centrifugal pump - Google Patents

Description

  The present invention relates to a double suction centrifugal pump.

  As background art of this technical field, for example, in Patent Document 1, “(1) First, the lower casing 3b is temporarily assembled with the disk-shaped jigs 21a and 21b and the fastening bolts 22 (2). Subsequently, the upper casing 3a is placed and the flanges 11a and 11b of the upper and lower casings 3a and 3b are tightened. (3) Next, the tightening bolt 22 is tightened from the hole of the right shaft seal portion 19, and the disc-shaped jig 21a is tightened. 21b is applied to the partition plates 14a and 14b of the upper and lower casings 3a and 3b, and further, a load is applied to the partition plates 14a and 14b from both sides of the shaft toward the center of the shaft. The side fits in a counterbore hole provided in the disk-shaped jig 21a, and is sealed using a lid 23, a bolt 24 and a gasket 25. (5) Finally, the left and right shaft seals 1 are sealed. And suction port, to seal closes the discharge port and other holes. "Is described as (see paragraph 0022).

Japanese Patent No. 4792930

The casing of both suction centrifugal pumps described in Patent Document 1 is divided into an upper casing and a lower casing, and a partition plate that divides the suction chamber and the discharge chamber is also divided into upper and lower partition plates. However, the casing assembly procedure described in paragraph 0022 does not include a procedure for fastening the upper and lower partition plates. That is, the upper casing and the lower casing are not fastened and fixed at the positions of the upper and lower partition plates.
When the upper and lower partition plates are not fastened and fixed in this way, the surface pressure at the joint surface of the partition plate cannot be sufficiently secured, and the joint surfaces of the upper and lower partition plates are separated by the pressurized working fluid. So-called mouth opening may occur.

  When a mouth opening occurs between the upper and lower partition plates, a moment is input to the fastening part of the upper casing and the lower casing due to the pressure acting on this part, so the fastening part is required to be strong enough to withstand the input moment. Is done. For this reason, it is necessary to increase the thickness of the fastening portion between the upper casing and the lower casing, or to use a large fastening member (such as a bolt), and there is a problem that the casing of the double suction centrifugal pump is enlarged.

  Then, this invention makes it a subject to provide the double suction vortex pump of the structure where the partition plate which divides a suction chamber and a discharge chamber does not open by internal pressure.

In order to solve the above problems, the present invention provides a suction chamber in which a suction chamber into which a working fluid is sucked and a discharge chamber for pressurizing the working fluid with an impeller are formed inside a casing composed of an upper casing and a lower casing. And a partition plate that divides the discharge chamber is a double suction centrifugal pump including a partition plate upper portion formed in the upper casing and a partition plate lower portion formed in the lower casing. An upper casing in which the upper part of the partition plate and the lower part of the partition plate are fastened and fixed, and a circular penetrating portion through which the main shaft serving as the rotation center of the impeller passes is formed by the upper part of the partition plate and the lower part of the partition plate. A rib is formed above the upper part of the partition plate and extends upward from the upper part of the partition plate. The rib and the upper part of the partition plate penetrate the lower fastening hole formed through the end of the lower part of the partition plate on the side of the circular penetration and A hollow portion of a vertical hole extending upward from the lower surface of the upper portion is provided through an end portion on the circular penetration portion side of the upper portion of the partition plate, and an upper fastening member passes through the vertical hole from above the rib to lower the partition plate It is characterized by being screwed into the lower fastening hole .

  According to the present invention, it is possible to provide a double suction centrifugal pump having a configuration in which the partition plate separating the suction chamber and the discharge chamber is not opened by an internal pressure.

It is an external view of both suction vortex pumps. It is sectional drawing which shows the inside of both suction vortex pumps. (A) is the figure which looked at both suction vortex pumps of the state which removed the upper casing from the upper direction, (b) is the A1 section enlarged view in (a). It is sectional drawing in Sec1-Sec1 shown in FIG. 6 is a cross-sectional view showing the inside of a double suction centrifugal pump according to Embodiment 2. FIG. (A) is a figure which shows the state by which the sealing member was arrange | positioned by the partition plate intermediate part and the partition plate lower part, (b) is a perspective view which shows the partition plate intermediate part fastened and fixed to the partition plate lower part. (A) is a figure which shows the partition plate inclined to the suction chamber side, (b) is a figure which shows the partition plate with which the inclined partition plate intermediate part is provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  FIG. 1 is a side view showing the external appearance of both suction centrifugal pumps, and FIG. 2 is a cross-sectional view showing the inside of both suction centrifugal pumps. 3 (a) is a view of the both suction centrifugal pumps with the upper casing removed, as viewed from above, FIG. 3 (b) is an enlarged view of the A1 portion in FIG. 4 (a), and FIG. 4 is Sec1 shown in FIG. -It is sectional drawing in Sec1.

1 is a pump that pressurizes the working fluid sucked from the suction port 4a and discharges it from the discharge port 5a. The casing 3 of both the suction centrifugal pumps 1 includes an upper casing 3a that is divided in the vertical direction on a surface (joint surface S1) that passes through the center of the main shaft 2 that is the rotation center of the impeller 2a shown in FIG. A lower casing 3b. That is, the upper casing 3 a forms the upper part of the casing 3, and the lower casing 3 b forms the lower part of the casing 3. An upper flange 3a1 extending outward is formed on the joint surface S1 of the upper casing 3a, and a lower flange 3b1 extending outward is formed on the joint surface S1 of the lower casing 3b.
The upper casing 3a and the lower casing 3b are connected by joining the upper flange 3a1 and the lower flange 3b1 at the joint surface S1, and the upper flange 3a1 and the lower flange 3b1 are fastened and fixed by bolts 10a. That is, the joint surface S1 is a joint between the upper casing 3a and the lower casing 3b.
In addition, both the suction vortex pumps 1 have the upper casing 3a side as the upper side (Up) and the lower casing 3b side as the lower side (Dn).

  For example, as shown in FIG. 3A, a plurality of screw holes 10c are formed in the lower flange 3b1, and a through hole 10b (FIG. 4) is formed in the upper flange 3a1 at a position corresponding to the screw hole 10c of the lower flange 3b1. Reference) is formed. As shown in FIG. 4, the upper flange 3a1 and the lower flange 3b1 are fastened and fixed by a configuration in which the bolt 10a inserted through the through hole 10b of the upper flange 3a1 is screwed into the screw hole 10c of the lower flange 3b1.

  Furthermore, as shown in FIG. 1, a rib 30 extending toward the lower casing 3b is formed outside the upper casing 3a. The rib 30 is formed in a hollow shape having an opening at the top, and a screw member (upper fastening member 31a) can be inserted therein. The upper fastening member 31a is screwed into a lower fastening hole 31b (see FIG. 3A), which will be described later, formed in the lower casing 3b, and the upper casing 3a and the lower casing 3b are formed by the upper fastening member 31a. The structure is fastened and fixed.

  The lower casing 3b is formed with a suction port 4a and a discharge port 5a that open in a direction orthogonal to the axial direction of the main shaft 2. The suction port 4a and the discharge port 5a are opened in directions opposite to each other with the main shaft 2 as a reference.

As shown in FIG. 2, a discharge chamber 5 communicating with the discharge port 5 a is formed inside the casing 3. In the discharge chamber 5, a spiral flow path 5 b is formed around the main shaft 2 (see FIG. 1) and is pressurized by an impeller 2 a (see FIG. 3 (a)) housed in the discharge chamber 5. The working fluid is configured to flow through the spiral flow path 5b and be discharged from the discharge port 5a.
The flow path 5b is formed with a volute partition plate 5b1 that branches the working fluid into two paths in the flow direction.

  Further, as shown in FIG. 3A, suction chambers 4 are formed on both sides of the discharge chamber 5 in the axial direction of the main shaft 2. The suction chambers 4 formed on both sides of the discharge chamber 5 are both in communication with the suction port 4a. That is, the suction chamber 4 is configured to branch to both sides of the discharge chamber 5 inside the suction port 4a. The suction chamber 4 and the discharge chamber 5 are separated by a partition plate 7.

The main shaft 2 is provided through the partition plate 7, and a circular through portion (circular through portion 70) centered on the main shaft 2 is formed in the partition plate 7 at a location where the main shaft 2 passes. And the suction side 2b formed in the side surface of the impeller 2a accommodated in the discharge chamber 5 and rotating with the main shaft 2 is configured to face the circular penetrating portion 70. The suction side 2b is formed on both surfaces of the impeller 2a on the side surface through which the main shaft 2 penetrates (the side surface in the axial direction of the main shaft 2), and sucks the working fluid from each of the suction chambers 4 formed on both sides of the discharge chamber 5. Configured to be possible.
That is, the circular penetrating portion 70 is formed to penetrate the partition plate 7 so that the suction side 2b of the impeller 2a faces the suction chamber 4.

As shown in FIG. 2, one partition plate 7 is divided into a partition plate upper portion 7a and a partition plate lower portion 7b at a joint surface S2 on the same plane as the joint surface S1 into which the upper casing 3a and the lower casing 3b are divided. . The partition plate upper part 7a is formed in the upper casing 3a, and the partition plate lower part 7b is formed in the lower casing 3b. When the upper casing 3a and the lower casing 3b are joined and joined at the joining surface S1, the partition plate upper portion 7a and the partition plate lower portion 7b are joined at the joining surface S2 to form the partition plate 7. That is, the joint surface S2 is a joint between the partition plate upper part 7a and the partition plate lower part 7b.
Further, the upper part 7a and the lower part 7b of the partition plate are respectively formed with semicircular openings 7a1 and 7b1 that are recessed in a substantially semicircular shape from the joining surface S2, and the semicircular openings 7b1 and 7a1 are combined. Thus, the circular penetrating portion 70 of the partition plate 7 is formed. Thus, in Example 1, the circular penetration part 70 is formed ranging over the partition plate upper part 7a and the partition plate lower part 7b.

In the both suction centrifugal pump 1 (see FIG. 1) of the first embodiment, the partition plate upper portion 7a and the partition plate lower portion 7b are fastened and fixed by the upper fastening member 31a shown in FIG.
Therefore, as shown in FIGS. 3A and 4, a screw hole (lower fastening hole 31 b) into which the upper fastening member 31 a is screwed is formed in the partition plate lower part 7 b. The rib 30 of the upper casing 3a is formed at a position where the partition plate upper portion 7a is formed, and the hollow portion of the rib 30 becomes a vertical hole 71 penetrating the partition plate upper portion 7a. The member 31a is configured to be inserted. Furthermore, the vertical hole 71 (hollow part of the rib 30) is formed in the position corresponding to the lower fastening hole 31b of the partition plate lower part 7b.

  Further, in order to liquid-tightly seal the gap between the connected upper casing 3a and the lower casing 3b and the gap between the connected partition plate upper part 7a and the partition plate lower part 7b, as shown in FIGS. A member 12 is disposed. The seal member 12 is disposed along the lower flange 3b1 formed on the joint surface S1 of the lower casing 3b, and the seal member 12 is disposed on the joint surface S2 of the partition plate lower portion 7b.

Specifically, the seal member 12 is disposed between the screw hole 10c formed in the lower flange 3b1, the suction chamber 4 and the discharge chamber 5, and further, the lower fastening hole 31b formed in the partition plate lower portion 7b and the suction It is disposed between the chamber 4 and the discharge chamber 5.
Further, the seal member 12 is disposed up to the end of the opening 3b2 formed in the lower casing 3b so that the main shaft 2 penetrates the casing 3. And in the joint surface S1 (joint part) of the lower casing 3b and the upper casing 3a (refer FIG. 1), it is comprised so that between the suction chamber 4, the discharge chamber 5, and the outer side of the casing 3 may be sealed.

Further, as shown in FIG. 3B, the end portion on the joining surface S2 side of the semicircular opening 7b1 formed in the partition plate lower portion 7b, and the seal member 12 disposed along the lower flange 3b1 Are connected by a seal member 12.
Then, as shown in FIGS. 3A and 3B, the sealing member 12 is disposed, so that the suction chamber 4 is formed at the joint surface S2 between the partition plate upper portion 7a (see FIG. 2) and the partition plate lower portion 7b. And the discharge chamber 5, between the suction chamber 4 and the discharge chamber 5 and the lower fastening hole 31 b, and between the circular through-hole 70 and the lower fastening hole 31 b are liquid-tightly partitioned by the seal member 12.
And, by this configuration, for example, the working fluid is prevented from entering the lower fastening hole 31b from the suction chamber 4 or the discharge chamber 5, and therefore the operation from the vertical hole 71 (see FIG. 4) communicating with the lower fastening hole 31b. Fluid leakage is prevented.

  As shown in FIG. 4, the seal member 12 is connected to the groove 12a formed in a concave shape on the joint surface S1 of the lower casing 3b and the groove 12a formed in a concave shape on the joint surface S2 of the partition plate lower portion 7b. What is necessary is just to set it as the structure by which elastic members, such as a shape gasket, are embedded.

As described above, in the double suction centrifugal pump 1 of Example 1 (see FIG. 1), the lower fastening hole 31b (see FIG. 3A) is formed in the partition plate lower part 7b (see FIG. 3A). The configuration is as follows.
Furthermore, the upper part which penetrates the vertical hole 71 (refer FIG. 4) which penetrates the partition plate upper part 7a (refer FIG. 3 (a)) from the rib 30 (refer FIG. 1) formed in the upper casing 3a (refer FIG. 1). The fastening member 31a (see FIG. 4) is configured to be screwed into (threaded into) the lower fastening hole 31b.
In this configuration, the partition plate upper portion 7a and the partition plate lower portion 7b are fastened and fixed by the upper fastening member 31a. Therefore, the joint surface S2 between the partition plate upper part 7a and the partition plate lower part 7b is separated in the vertical direction, so that a so-called opening in which a gap is generated between the partition plate upper part 7a and the partition plate lower part 7b is preferably prevented.

  Further, as shown in FIGS. 3 and 4, the seal member 12 is disposed, so that the space between the upper part 7a (see FIG. 4) and the lower part 7b (see FIG. 4) is liquid-tightly sealed. The Accordingly, the working fluid is prevented from entering between the partition plate upper part 7a and the partition plate lower part 7b, and the joining surface S2 between the partition plate upper part 7a and the partition plate lower part 7b by the working fluid that has entered between them (see FIG. 4). ) In the vertical direction is prevented. As a result, the opening of the mouth between the partition plate upper part 7a and the partition plate lower part 7b is preferably prevented.

  The strength required for the upper flange 3a1 and the lower flange 3b1 is reduced by preventing the opening between the partition plate upper portion 7a and the partition plate lower portion 7b, so that the thickness of the upper flange 3a1 and the lower flange 3b1 is reduced. It is possible to reduce the thickness of the bolt 10a and use a small bolt 10a. Therefore, a lightweight double suction centrifugal pump 1 can be obtained.

  The upper fastening member 31a (see FIG. 4) for fastening and fixing the partition plate upper portion 7a (see FIG. 2) and the partition plate lower portion 7b (see FIG. 2) is connected to the upper casing 3a (see FIG. 4) via the ribs 30 (see FIG. 4). (See FIG. 4). Therefore, the attachment work of the upper fastening member 31a is extremely easy, and workability is not impaired.

  In FIG. 1, FIG. 3, etc., two ribs 30 are formed for one partition plate 7, and the partition plate upper portion 7a and the partition plate lower portion 7b are fastened and fixed by two upper fastening members 31a. A configuration is shown. However, the number of the upper fastening members 31a that fasten and fix the partition plate upper part 7a and the partition plate lower part 7b is not limited to two. The partition plate upper portion 7a and the partition plate lower portion 7b may be fastened and fixed by one upper fastening member 31a, or the partition plate upper portion 7a and the partition plate lower portion 7b are fastened by three or more upper fastening members 31a. It may be a fixed configuration.

FIG. 5 is a cross-sectional view showing the inside of the double suction centrifugal pump according to the second embodiment.
In addition, the double suction vortex pump 1a of Example 2 is the same structure as the double suction vortex pump 1 of Example 1 shown in FIGS. 1-4 except the shape of the partition plate 7. FIG. Therefore, the same components as those of the both suction centrifugal pumps 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 5, the two suction centrifugal pumps 1 a according to the second embodiment are configured such that the partition plate 7 that separates the suction chamber 4 and the discharge chamber 5 includes a partition plate intermediate portion 7 c.
Specifically, the partition plate intermediate portion 7c is disposed at a part between the partition plate upper portion 7a and the partition plate lower portion 7b. In the partition plate intermediate portion 7c, for example, a semicircular opening portion 7c1 that forms the circular through portion 70 of the partition plate 7 together with the semicircular opening portion 7b1 of the partition plate lower portion 7b is formed. Thus, in Example 2, the circular penetration part 70 is formed ranging over the partition plate intermediate part 7c and the partition plate lower part 7b.
The upper surface (upper surface 7 c 5) of the partition plate intermediate portion 7 c is formed as a curved surface that curves toward the circumferential direction of the circular through portion 70.

Further, the partition plate intermediate portion 7c is formed with a fixing portion 7c6 whose end in contact with the joint surface S2 extends outward. The partition plate intermediate portion 7c is fixed to the joint surface S2 of the partition plate lower portion 7b at the fixing portion 7c6. Join. That is, in Example 2, the fixing portion 7c6 is a joint portion between the partition plate lower portion 7b and the partition plate intermediate portion 7c.
The fixing portion 7c6 is formed with an insertion hole (intermediate portion insertion hole 7c2) through which a screw member (intermediate portion fastening member 7c3) for fastening and fixing the partition plate intermediate portion 7c to the partition plate lower portion 7b is inserted. The partition plate intermediate portion 7c is fastened and fixed to the joint surface S2 of the partition plate lower portion 7b by the intermediate portion fastening member 7c3 that is inserted through the intermediate portion insertion hole 7c2. For this reason, the structure by which the screw hole (intermediate part fastening hole 7b2) in which the intermediate part fastening member 7c3 is screwed in is formed in the joint surface S2 of the partition plate lower part 7b.

  Further, the joining surface S2 of the upper part 7a of the partition plate is formed in the same shape as the curved surface of the upper surface 7c5 of the intermediate part 7c of the partition plate, and further has a shape that fits with the fixing part 7c6 formed in the intermediate part 7c of the partition plate. It is preferable. With this configuration, when the upper casing 3a is connected to the lower casing 3b, the partition plate intermediate portion 7c fixed to the partition plate lower portion 7b is engaged with the partition plate upper portion 7a to form the partition plate 7. In the second embodiment, the upper surface 7c5 and the upper surface and side surfaces of the fixing portion 7c6 become the joint between the partition plate upper portion 7a and the partition plate intermediate portion 7c.

Further, a vertical hole 71 forming a hollow portion of the rib 30 formed in the upper casing 3a penetrates the upper part of the partition plate 7a toward the lower casing 3b, and the partition plate is extended on the extension of the vertical hole 71 on the lower casing 3b side. The intermediate portion 7c is disposed, and a lower fastening hole 7c4 is formed at a position facing the vertical hole 71 on the upper surface 7c5 of the partition plate intermediate portion 7c.
If the upper fastening member 31a that passes through the vertical hole 71 from the rib 30 side is screwed into the lower fastening hole 7c4 of the partition plate intermediate portion 7c, the partition plate upper portion 7a and the partition plate intermediate portion 7c are fastened. Fixed. Since the partition plate intermediate portion 7c is fastened and fixed to the partition plate lower portion 7b, all of the partition plate upper portion 7a, the partition plate intermediate portion 7c, and the partition plate lower portion 7b are fastened and fixed.
Therefore, it can be set as the structure where the opening between the partition plate upper part 7a and the partition plate intermediate part 7c is prevented.
5 illustrates three ribs 30, three vertical holes 71, and three lower fastening holes 7c4, the number of ribs 30, vertical holes 71, and lower fastening holes 7c4 is not limited.

FIG. 6A is a diagram showing a state in which a seal member is disposed in the middle part of the partition plate and the lower part of the partition plate, and FIG. 6B is a perspective view showing the middle part of the partition plate fastened and fixed to the lower part of the partition plate. is there.
As shown in FIGS. 6A and 6B, the upper surface 7c5 of the partition plate intermediate portion 7c to be joined to the joint surface S2 (see FIG. 5) of the partition plate upper portion 7a is formed from one intermediate portion insertion hole 7c2. A configuration in which a string-like seal member 12 is provided extending in the direction toward the other intermediate portion insertion hole 7c2 is preferable. Two sealing members 12 are arranged so as to sandwich the intermediate portion insertion hole 7c2 and the lower fastening hole 7c4, and are arranged over the entire area of the upper surface 7c5 and the fixing portion 7c6 in contact with the partition plate upper portion 7a (see FIG. 5). The structure provided is preferable. With this configuration, the space between the partition plate upper portion 7a and the partition plate intermediate portion 7c is liquid-tightly sealed.

Moreover, it is preferable that the joining surface S2 of the partition plate lower part 7b is provided with a seal member 12 extending in a direction from the semicircular opening 7b1 toward the lower flange 3b1 (see FIG. 3A). It is preferable that two seal members 12 are disposed so as to sandwich the intermediate portion fastening hole 7b2 and also disposed at a portion in contact with the partition plate intermediate portion 7c. Further, the seal member 12 is also disposed between the intermediate portion fastening hole 7b2 and the semicircular opening 7b1 (circular through portion 70), and the seal disposed between the intermediate portion fastening hole 7b2 and the semicircular opening 7b1. A configuration in which the member 12 and the end portion on the joining surface S2 side of the semicircular opening 7b1 are connected by the seal member 12 is preferable. With this configuration, the space between the partition plate lower portion 7b and the partition plate intermediate portion 7c is liquid-tightly sealed. Further, the space between the circular through portion 70 and the intermediate portion fastening hole 7b2 is also liquid-tightly sealed.
And like Example 1, it is preferable that the sealing member 12 is arrange | positioned also in the junction part which the partition plate upper part 7a (refer FIG. 5) and the partition plate lower part 7b join on the joining surface S2.

  As described above, by disposing the seal member 12, the gap between the partition plate upper portion 7a (see FIG. 5) and the partition plate middle portion 7c, the gap between the partition plate lower portion 7b and the partition plate middle portion 7c, and the partition The gap between the plate upper portion 7a and the partition plate lower portion 7b is sealed in a liquid-tight manner by the seal member 12. Accordingly, the working fluid is prevented from entering all the gaps of the partition plate upper part 7a, the partition plate intermediate part 7c, and the partition plate lower part 7b, and the generation of pressure in the vertical direction by the working fluid that has entered these gaps is prevented. . As a result, it is possible to suitably prevent a mouth opening from occurring between the partition plate upper portion 7a, the partition plate intermediate portion 7c, and the partition plate lower portion 7b.

Further, on the joining surface S2 where the partition plate upper portion 7a (see FIG. 5) and the partition plate lower portion 7b are joined, the space between the suction chamber 4 (see FIG. 2) and the discharge chamber 5 (see FIG. 2) is a liquid between the seal member 12. Closely partitioned.
Further, in the upper surface 7c5 and the fixing portion 7c6 of the partition plate intermediate portion 7c where the partition plate upper portion 7a and the partition plate intermediate portion 7c are joined, the suction chamber 4 and the lower fastening hole 7c4 and the intermediate portion are interposed between the suction chamber 4 and the discharge chamber 5. Between the insertion hole 7 c 2, the discharge chamber 5, the lower fastening hole 7 c 4, and the intermediate part insertion hole 7 c 2 are partitioned liquid-tightly by the seal member 12.
Further, in the fixing portion 7c6 of the partition plate intermediate portion 7c where the partition plate intermediate portion 7c and the partition plate lower portion 7b are joined, between the suction chamber 4 and the discharge chamber 5, between the suction chamber 4 and the intermediate portion fastening hole 7b2, the discharge chamber. 5 and the intermediate portion fastening hole 7b2 are liquid-tightly partitioned by the seal member 12.
And, by this configuration, for example, the working fluid is prevented from entering the lower fastening hole 7c4 from the suction chamber 4 or the discharge chamber 5, so that the operation from the vertical hole 71 (see FIG. 5) communicating with the lower fastening hole 7c4 is performed. Fluid leakage is prevented.

Next, effects provided by the partition plate intermediate portion 7c will be described.
FIG. 7A is a view showing a partition plate inclined toward the suction chamber, and FIG. 7B is a view showing a partition plate provided with an inclined partition plate intermediate portion.
For example, as shown in FIG. 7A, when the partition plate 7 that separates the suction chamber 4 and the discharge chamber 5 is inclined from the upper side to the lower side of the suction chamber 4, the partition plate upper portion 7a is changed to the partition plate. The vertical hole 71 that penetrates the lower portion 7 b and through which the upper fastening member 31 a is inserted is also inclined with respect to the vertical direction. Further, the lower fastening hole 31 b formed in the partition plate lower portion 7 b is also adjusted to the inclination of the vertical hole 71. It is necessary to incline.
Processing of such vertical holes 71 and lower fastening holes 31b is inferior in workability, and the workability for attaching the upper fastening member 31a is also lowered because the upper fastening member 31a is inclined and attached.

  On the other hand, as shown in FIG. 7B, if the partition plate 7 is provided with the partition plate intermediate portion 7c inclined with respect to the vertical direction, the partition plate intermediate portion 7c is fastened to the partition plate lower portion 7b. The intermediate portion fastening hole 7b2 into which the fixed intermediate portion fastening member 7c3 is screwed can be formed without being inclined with respect to the vertical direction. Moreover, the vertical hole 71 which penetrates the partition plate upper part 7a to the partition plate lower part 7b side, and the upper fastening member 31a penetrates should just be the structure formed to the upper surface of the partition plate intermediate part 7c. Can be formed without tilting. Therefore, it is possible to suppress a decrease in workability for processing the intermediate portion fastening hole 7b2 and the vertical hole 71. Moreover, since it can attach without inclining the intermediate | middle part fastening member 7c3 and the upper fastening member 31a, the fall of workability | operativity which attaches the intermediate | middle part fastening member 7c3 and the upper fastening member 31a can also be suppressed.

In addition, this invention is not limited to an above-described Example. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
Also, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment.

For example, in the first and second embodiments, as shown in FIGS. 3A and 6A, the linear seal member 12 is provided. The structure provided with the sealing member of the shape covered with a surface may be sufficient.
Further, in the second embodiment, as illustrated in FIG. 5, the configuration includes one partition plate intermediate portion 7c. However, the configuration may include two or more partition plate intermediate portions 7c.

In addition, the present invention is not limited to the above-described embodiments, and appropriate design changes can be made without departing from the spirit of the invention.
For example, as shown in FIG. 6B, the partition plate intermediate portion 7c is fastened and fixed to the partition plate lower portion 7b. However, the partition plate intermediate portion 7b is fixed to the partition plate lower portion 7b by other fixing methods such as welding. 7c may be fixed.

1, 1a Double suction centrifugal pump 2a Impeller 3 Casing 3a Upper casing 3b Lower casing 4 Suction chamber 4a Suction port 5 Discharge chamber 5a Discharge port 7 Partition plate 7a Partition plate upper portion 7b Partition plate lower portion 7b2 Intermediate portion fastening hole 7c Partition plate middle Part 7c2 Middle part insertion hole 7c3 Middle part fastening member 7c4, 31b Lower fastening hole 7c5 Upper surface (joint part of partition plate upper part and partition plate middle part)
7c6 fixed part (joint part of partition plate upper part and partition plate middle part, joint part of partition plate middle part and partition plate lower part)
12 Seal member 31a Upper fastening member 70 Circular penetration part (penetration part)
71 Vertical hole S1 Joint surface S2 Joint surface (joint part of partition plate upper part and partition plate lower part)

Claims (4)

A suction chamber communicating with a suction port for sucking the working fluid;
A discharge chamber containing an impeller for pressurizing the working fluid sucked into the suction chamber and communicating with a discharge port for discharging the pressurized working fluid;
A partition plate separating the suction chamber and the discharge chamber is formed inside the casing;
The casing is formed by fastening and fixing an upper casing that forms an upper part and a lower casing that forms a lower part,
The partition plate is formed by joining a partition plate upper portion formed in the upper casing and a partition plate lower portion formed in the lower casing,
A circular penetration part through which the main shaft that is the rotation center of the impeller penetrates is formed by the partition plate upper part and the partition plate lower part,
A rib extending upward from the upper casing forming the discharge chamber is formed above the upper part of the partition plate,
A hollow portion of a vertical hole extending through the lower fastening hole formed in the rib and the upper part of the partition plate through the circular penetration part side end of the lower part of the partition plate and extending upward from the lower surface of the lower part of the partition plate Is provided through the end on the circular penetration part side of the upper part of the partition plate,
That the upper part fastening member, the partition plate is screwed into the lower fastening hole of the bottom through the vertical hole from above the ribs, the partition plate upper and the partition plate lower is fastened Features a double suction centrifugal pump. A penetrating portion that penetrates the partition plate so as to face the suction chamber of the impeller is formed across the partition plate upper portion and the partition plate lower portion,
A seal member for liquid-tightly sealing a gap between the upper casing and the lower casing, and a gap between the upper part of the partition plate and the lower part of the partition plate,
At the junction between the upper part of the partition plate and the lower part of the partition plate, between the suction chamber and the discharge chamber, between the suction chamber and the lower fastening hole, between the discharge chamber and the lower fastening hole, The double suction centrifugal pump according to claim 1, wherein the suction pump is disposed so as to partition a through portion and the lower fastening hole in a liquid-tight manner. A partition plate intermediate portion disposed between the partition plate lower portion and the partition plate upper portion is fixed,
The double suction centrifugal pump according to claim 1, wherein the lower fastening hole is formed in an intermediate portion of the partition plate. A penetrating portion that penetrates the partition plate so as to face the suction chamber of the impeller is formed across the partition plate intermediate portion and the lower portion of the partition plate,
The gap between the upper casing and the lower casing, the gap between the upper part of the partition plate and the lower part of the partition plate, the gap between the upper part of the partition plate and the middle part of the partition plate, and the gap between the middle part of the partition plate and the lower part of the partition plate are liquidated. A sealing member that tightly seals
In the junction between the upper part of the partition plate and the lower part of the partition plate, the suction chamber and the discharge chamber are partitioned liquid-tightly,
At the junction between the upper part of the partition plate and the middle part of the partition plate, between the suction chamber and the discharge chamber, between the suction chamber and the lower fastening hole, between the discharge chamber and the lower fastening hole, Liquid-tightly between the intermediate portion insertion hole through which the intermediate portion fastening member for fastening and fixing the partition plate intermediate portion to the lower portion of the partition plate and the suction chamber, and between the discharge chamber and the intermediate portion insertion hole. partition,
An intermediate portion fastening hole formed between the suction chamber and the discharge chamber, at the lower portion of the partition plate, and into which the intermediate portion fastening member is screwed, at a joint portion between the partition plate intermediate portion and the lower portion of the partition plate It is arrange | positioned so that between the suction chambers, between the said intermediate part fastening hole and the said discharge chamber, and between the said penetration part and the said intermediate part fastening hole may be liquid-tightly partitioned. Item 4. The double suction centrifugal pump according to item 3.

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