JPH11257248A - Sea water pump for cooling marine internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly and easily remove an impeller from an impeller shaft by retreating one end of the impeller shaft from the end part of the impeller by a predetermined length so as to form a removable tool connecting part and arranging a screw part in the removable tool connecting part. SOLUTION: A removable tool connecting part 12d is formed by retreating the end plate side one end of an impeller shaft 11 from the end part 12g of an impeller 12A by a predetermined length L. A screw part is arranged in this removable tool connecting part 12d. Namely, the impeller 12A is composed in a manner that the screw part 12d is formed on an inner circumferential surface on a side opposite to the bearing case part 13b of a spline part 12s. When the impeller 12A is removed, an end cover on the end part of a body part 13 is removed, the end part 12g of the impeller 12A is exposed, and the end screw part 31a of a stud bolt 31 being one of a removable tool is screwed in the screw part 12d opened in this end part 12g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seawater pump for cooling a marine internal combustion engine which draws in and discharges seawater for use in cooling a marine internal combustion engine.

[0002]

2. Description of the Related Art As shown in FIG. 7, a cooling water W is circulated in a water jacket 4 in an engine 1 by a water pump 5 to cool the inside of the engine 1. Cooling of the cooling water W is performed by using the seawater Ws in a heat exchanger 2 called a heat exchanger corresponding to a radiator of an engine of an automobile or the like.
The cooling by the seawater Ws is performed by feeding the seawater Ws sucked and discharged by the seawater pump 10 to the heat exchanger 2, and also cools the intake air A entering the engine via the turbocharger 3. Is also cooled by this seawater Ws.

[0003] Cooling using this seawater is convenient because the temperature of the seawater is relatively stable at 5 ° C to 25 ° C and is inexhaustible, but on the other hand, the salt content contained in the seawater is high. As a result, corrosion (electrolytic corrosion) due to the electrochemical action occurs, and it is necessary to take measures against this salt damage. As shown in FIGS. 8 to 11, the structure of this seawater pump 10 is such that an inlet 14 and an outlet 15 are provided in an impeller case portion 13 and a rubber impeller 12 as shown in FIG. A body cam portion 16 is provided on an inner peripheral surface where the impeller 12 is inscribed.

As shown in FIG. 10, the body 13 normally includes a bearing case 13a and an impeller case 13b.
Are integrally formed, and the marine internal combustion engine 1 is
Attached to. The end of the impeller case 13a on the opening side is an end plate with the gasket 50 interposed therebetween.
19 is attached with bolts 18 and closed. Also, as shown in FIG.
There is also a split type seawater pump 10A divided into an impeller case portion 55 and an impeller case portion 55. However, the impeller case portion 55 is fastened to the bearing case portion 54 from the mount portion 1a side of the engine 1 by bolts 57, and the end plate 56 is After assembling the seawater pump by fastening it to the end of the impeller case 55 with another bolt 58, it is assembled to the internal combustion engine 1 with the bolt 17,
The structure is such that the bolt 58 on the side of the bearing case 54 disposed close to the engine parts cannot be removed.

[0005] In these seawater pumps 10 and 10A, the impeller 12 is spline-fitted to an impeller shaft (input shaft) 11 driven by a belt or a gear connected to the internal combustion engine 1, and the end of the impeller 12 is splined. Sealed with a seal 12f. When the impeller 12 rotates inside the impeller case portion 13b of the body portion 13, when the distal end side 12a of the impeller 12 compressed by the body cam portion 16 provided in the impeller case portion 13b expands, the seawater Ws flows from the inlet 14. Suction, rotation in the impeller case portion 13b, and then discharge of the seawater Ws sucked when compressed by the body cam portion 16 to the outlet 15, so as to sequentially suck and discharge seawater Ws.

Since the impeller 12 is a regular replacement part and needs to be easily replaced, the end plate 19 is removed, and the impeller 12 is connected to the impeller shaft (input shaft) from outside the impeller case portions 13b and 55. ) 11
And can be set and exchanged. However, after the seawater pumps 10 and 10A have been operated for a long time, the fitting portion 11s of the impeller shaft 11 and the fitting portion 12s of the impeller 12 often adhere to each other, which makes it difficult to remove with a general tool. A special tool 20 as shown in FIG. 13 is prepared on the part manufacturer side.

Removal of the impeller 10 using the special tool 20 is performed as follows. First, as shown in FIG. 14, the wing nut 21 of the tool 20 is rotated in the direction of arrow B to open the claw portion 22, and the handle 23 is rotated in the direction of A to attach the shaft 24 to the support 25. After moving the special tool 20 in the direction of arrow C, the claw portion 22 is inserted between the blades 12c of the impeller 12.

Next, as shown in FIG. 15, the wing nut 21 is turned in the direction of arrow D so that the claws 21 on both sides of the tool 20 are
Into the side rubber portion 12b. Then, as shown in FIG. 16, the handle 23 is rotated in the direction of arrow E, and the support 25 screwed to the shaft 24 is relatively displaced in the direction of arrow F so that the impeller 12 is moved to the impeller shaft. It is pulled out from 11.

[0009]

However, the impeller 12 is made of rubber, and after using the seawater pumps 10 and 10A for a long time, the spline fitting portions 11s and 12s of the impeller shaft 11 and the impeller 12 are fixed. In many cases, even if this special tool 20 is used, the claw portion 22 slides on the side rubber portion 12b and only the tool 20 moves, so that the impeller 12 cannot be pulled out. There is a problem that is not suitable for.

In this case, even if the claw portion 22 is sharply formed, the impeller 12 itself is cut off, and the impeller 12 cannot be removed. The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a seawater pump for cooling a marine internal combustion engine in which an impeller can be easily replaced.

[0011]

Means for Solving the Problems [1] A seawater cooling pump for a marine internal combustion engine for achieving the above object has a rubber impeller fitted into a body portion, and the impeller is connected to the body portion. In a seawater pump spline-fitted to one end of an impeller shaft pivotally supported by, the removal of the one end of the impeller shaft from the end of the impeller by a predetermined length to form a removal tool connecting portion, A screw portion is provided at the connection portion of the removal tool.

According to the cooling seawater pump having this structure, the removal tool can be screwed into the screw portion formed on the inner peripheral surface of the impeller opposite to the mount portion, so that the impeller can be firmly connected. Can be reliably and easily removed from the impeller shaft. [2] Alternatively, a seawater pump for cooling a marine internal combustion engine is a seawater pump in which a rubber impeller is fitted into a body portion, and the impeller is spline-fitted to one end of an impeller shaft pivotally supported by the body portion. The body portion is formed roughly into a width of the impeller, and is divided into an impeller case portion that houses the impeller and a bearing case portion that pivotally supports the impeller shaft. A seawater pump for cooling an internal combustion engine for ships, wherein the seawater pump is detachably fastened to the bearing case portion with through bolts.

According to the seawater pump for cooling a marine internal combustion engine having this structure, the body of the seawater pump is divided into a bearing case and an impeller case, and both cases are fixed by through bolts. By removing the bolt and removing the impeller case, the impeller can be exposed, so that the impeller can be easily removed with a normal tool. [3] In addition to the latter structure, an end portion having an opening through which a spline portion of the impeller shaft can be inserted is provided on the bearing case portion side of the impeller case portion, and the opening portion is provided with the opening portion. It is formed smaller than the outer shape of the impeller.

According to the seawater pump for cooling a marine internal combustion engine having this last structure, the end face of the impeller can be pressed by the end of the bearing case when the impeller case is removed. The impeller can be easily removed by using only a tool to remove the through bolt.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a seawater pump for cooling a marine internal combustion engine according to the present invention will be described below with reference to the drawings. [1] First Embodiment According to the Present Invention A cooling seawater pump 100 for a marine internal combustion engine has a rubber impeller 12A as shown in FIG.
0, which is housed in place of the impeller 12 of the seawater pump 10 shown in FIG. 11, and is the same as the conventional seawater pump 10 except for the impeller 12A.

That is, as shown in FIGS. 10 and 11, in the seawater pump 10, a rubber impeller 12A shown in FIG. 1 is fitted into the body portion 13, and this impeller 12A is pivotally supported by the body portion 13. Is spline-fitted to one end of the impeller shaft 11. The body part 13 has an entrance 14 and an exit 15
And a body cam portion 16 is provided on the inner peripheral surface where the impeller 12A is inscribed. This body part 13 is shown in FIG.
As shown in FIG. 0, the bearing case 13a and the impeller case 13b are integrally formed. The end of the impeller case 13b on the opening side is closed by attaching the end plate 19 with bolts 18 with the gasket 50 interposed therebetween.

The seawater pump 100 has one end on the end plate 19 side of the impeller shaft 11 and the impeller 12A.
Is removed from the end 12g by a predetermined length L to form a removal tool connecting portion 12d. And this removal tool connection part 12
d is provided with a screw portion. That is, the impeller 12A is
As shown in FIG. 1, a screw portion 12d is formed on the inner peripheral surface of the spline portion 12s of the impeller 12A on the side opposite to the bearing case portion 13b.
Is formed.

According to the seawater pump 100 having the above-described structure, the impeller 12A is removed from the body 13 as shown in FIG.
Remove the end cover 19 at the end of the impeller 12A to expose the end 12g of the impeller 12A.
A screw thread 31a at the tip of a stud bolt 31, which is one of the removal tools, is screwed into 12d.

Next, the pedestal 32 is brought into contact with the end of the body portion 13 while the stud bolt 31 is inserted into a through hole 32h provided in a pedestal (jattle) 32, which is another removal tool. Then, a nut 33 is screwed into a screw portion 31b provided at a portion of the stud bolt 31 protruding from the pedestal 32 and tightened. By tightening the nut 33, the stud bolt 31
At the same time, the impeller 12A is moved in the direction of arrow G and pulled out from the impeller shaft 11.

Therefore, in this seawater pump 100,
Using the screw portion 12d opened at the end 12g of the impeller 12A, an impeller removal tool including a stud bolt 31, a pedestal 32, and a nut 33 is set, and the nut 33 is tightened to remove the impeller 12A. It can be reliably removed.

Further, since only a new threaded portion 12d is provided at the end of the impeller 12A, the design change of the seawater pump 100 is minimized, and in addition, FIGS. ZU seawater pump 10 and seawater pump of Fig. 12
In the case of 10A, the seawater pump 100 can easily replace the impeller simply by converting the impeller 12 to the impeller 12A.
Can be changed to

[2] Second Embodiment of the Present Invention A cooling seawater pump 101 for a marine internal combustion engine has a rubber impeller 12 fitted in a body 43 as shown in FIG. The impeller 12 is spline-fitted to one end of the impeller shaft 11 pivotally supported by the body 43.

The body 43 in which the impeller 12 slides and rotates is formed to have an approximate width M of the impeller 12, and an impeller case 45 for accommodating the impeller 12, and a bearing case for pivotally supporting the impeller shaft 11. 44 and formed separately. That is, the spline fitting portion of the impeller shaft 11
The bearing 1 is divided into a bearing case 44 and an impeller case 45 on the mount 1a side of the engine 1 from 11s.

Further, the bearing case 44 is connected to the internal combustion engine 1.
The impeller case part 44 is detachably fastened to the bearing case part 44 with a through bolt 47 so that the impeller case part 45 can be removed from the bearing case part 44 while being attached to the side. That is, the end plate 46 is passed through the divided impeller case 45 and the bolt 47 through the washer 48.
In addition, it is formed so as to be detachably fastened to the bearing case portion 44.

At the time of this fastening, the bearing case 44
A gasket 49 between the impeller case 45 and the impeller case 45, and a gasket between the impeller case 45 and the end plate 46.
Place 50 to prevent water leakage. Therefore, according to the structure described above, the impeller case portion 44 containing the impeller 12 is built.
The impeller 12 can be exposed by removing the impeller case portion 45, so that the impeller 12 and the bearing case portion 44 can be exposed.
A normal tool such as a flathead screwdriver can be inserted into the gap and easily removed.

[3] Seawater pump 102 for cooling a marine internal combustion engine according to the third embodiment 102 Seawater pump for cooling an marine internal combustion engine according to the second embodiment
4 to 6, as shown in FIGS. 4 to 6, an impeller shaft is provided on the bearing case portion 44 side of the impeller case portion 45A.
11 is provided with an end 45a having an opening 45h through which the spline 11s can be inserted. As shown in FIGS. 5 and 6, when the impeller case 45A is removed from the bearing case 44, the impeller 12 The opening 45h is formed smaller than the outer shape of the impeller 12 so that the end 45a presses the end face 12e of the impeller 12 in the direction in which the impeller 12 is removed from the impeller shaft 11, and the impeller 12 can be removed from the impeller shaft 11.

According to the seawater pump 102 having this structure, the end portion 45a of the impeller case portion 45A can press the end surface 12e of the impeller 12 on the bearing case portion 44 side, so that the impeller case portion 45A is connected to the bearing case portion. 44
The impeller 12 can be removed together with the impeller. In this case, the impeller 12 can be partially removed from the impeller shaft 11 by pressing the impeller 12 with a part of the force for removing the impeller case portion 45A without requiring a tool other than the tool for removing the through bolt 47.

After the impeller 12 is pulled out from the impeller case 45A, the impeller case 45A is attached to the bearing case 44 again, and the new impeller 12 is spline-fitted to the impeller shaft 11, and the end plate
By attaching 19, the replacement of the impeller 12 can be completed. At this time, the impeller 12 is set in advance in the impeller case 45A, and this is set in the bearing case.
Attaching it to the 45A and attaching it to the spline portion 11s further improves the work efficiency.

Therefore, it is necessary to change the design of the impeller case 45 of the body 43 of the seawater pump 101 to the impeller case 45A. However, a tool for removing the impeller 12 can be dispensed with. Can be made extremely simple work, so that the work efficiency at the time of replacing the impeller can be remarkably improved.

[0030]

[1] As described above, according to the seawater cooling pump for a marine internal combustion engine according to the first aspect of the present invention, the removal opening at the end face of the impeller opposite to the mount portion. Since the screw portion is formed by providing the tool connecting portion, the impeller can be firmly connected to the removal tool by screwing the removal tool into the screw portion. Can be reliably and easily removed from the impeller shaft.

Further, since only a part of the impeller needs to be modified without changing the basic structure of the conventional seawater pump, the design and production line of each part of the existing seawater pump can be easily changed without any significant change. It is possible to provide a seawater pump for cooling a marine internal combustion engine whose impeller is replaceable.

[2] Next, according to the seawater pump for cooling a marine internal combustion engine according to claim 2 of the present invention, the body part of the seawater pump is divided into a bearing case part and an impeller case part. When the impeller is removed, the impeller can be exposed by removing the impeller case and removing the impeller case, so that the impeller can be easily removed with a normal tool. .

[3] Further, according to the seawater pump for cooling a marine internal combustion engine according to claim 3 of the present invention, the body of the seawater pump is formed by the bearing case 16 and the impeller case 17.
, And fix both cases with through bolts.Remove the through bolts when removing the impeller, and press the end face of the impeller with the end of the bearing case when removing the impeller case. Can be pulled out from the impeller shaft, so that the impeller can be easily removed by using only a tool capable of removing the through bolt.

Therefore, according to the present invention, it is possible to provide a seawater pump for cooling a marine internal combustion engine in which the impeller can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an impeller of a seawater pump according to a first embodiment of the present invention.

FIG. 2 is a front sectional view for explaining a method of removing the impeller of FIG. 1;

FIG. 3 is an exploded perspective view of a seawater pump according to a second embodiment of the present invention.

FIG. 4 is a front partial view of a seawater pump according to a third embodiment of the present invention in a partial sectional view.

5 is a partial front view of the seawater pump of FIG.

6 is an XX of an impeller case of the seawater pump of FIG. 4;
It is the figure seen from the direction.

FIG. 7 is a configuration diagram showing a cooling system of the marine internal combustion engine.

FIG. 8 is a side sectional view for explaining the operation principle of the seawater pump.

FIG. 9 is a perspective view of an impeller of the seawater pump.

FIG. 10 is a front sectional view of a conventional seawater pump.

FIG. 11 is a side view of an impeller case portion of the seawater pump.

FIG. 12 is a partial front view of a conventional split-type seawater pump.

FIG. 13 is a schematic view of a conventional special tool for removing an impeller.

FIG. 14 is a first perspective view for explaining an impeller removal operation using a special tool.

FIG. 15 is a second perspective view for explaining an impeller removal operation using a special tool.

FIG. 16 is a third perspective view for explaining an impeller removal operation using a special tool.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine 2 Heat exchanger 3 Intercooler 4 Water jacket 5 Water pump 6 Turbo targer 10, 10A, 100, 101 Seawater pump 11 Impeller shaft 12, 12A Impeller 12a Tip 12b Side rubber part 12c End 12d Connection of removal tool Part (screw part) 12e, 12g End part 12f Spline seal 12s Fitting part 13, 43 Body part 13a Bearing case part 13b Impeller case part 14 Inlet 15 Exit 16 Body cam part 17, 18 Bolt 19 End plate 20 Special tool 21 Wing nut 22 Claw 23 Handle 24 Axis 25 Support 44 Bearing case 45, 45A Impeller case 45a End 45h Opening 47 Through bolt 49, 50 Gasket

Claims (3)

[Claims] 1. A seawater pump in which a rubber impeller is fitted into a body portion and the impeller is spline-fitted to one end of an impeller shaft pivotally supported by the body portion, wherein one end of the impeller shaft is connected to the impeller. A seawater pump for cooling a marine internal combustion engine, wherein a removal tool connection portion is formed by being retracted by a predetermined length from an end portion, and a screw portion is provided in the removal tool connection portion. 2. A seawater pump in which a rubber impeller is fitted into a body portion and the impeller is spline-fitted to one end of an impeller shaft pivotally supported by the body portion, wherein the body portion has a width substantially equal to the width of the impeller. And formed into an impeller case portion for accommodating the impeller and a bearing case portion for pivotally supporting the impeller shaft, and detachably attached to the bearing case portion with bolts through the impeller case portion. A seawater pump for cooling an internal combustion engine for ships, wherein the seawater pump is fastened. 3. An end portion having an opening through which a spline portion of the impeller shaft can be inserted is provided on the bearing case portion side of the impeller case portion, and the opening portion is formed smaller than the outer shape of the impeller. The seawater pump for cooling a marine internal combustion engine according to claim 2, wherein