JPS5827117Y2 - pump - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pump in which a wear ring part of an impeller is brought close to a liner ring part of a casing to partition a high pressure part and a low pressure part.

Conventionally, in this type of pump, the facing surfaces of the liner ring portion of the casing and the wear ring portion of the impeller are set to be parallel to each other.

Therefore, if foreign matter contained in the fluid passing through the pump chamber gets caught between the two ring parts, it will come out outside.
Therefore, there is a disadvantage that seizure accidents are likely to occur.

The present invention was developed in view of these circumstances, and even if foreign matter gets caught between the liner ring part and the wear ring part, the foreign matter is quickly discharged to the low pressure part side, effectively preventing seizure accidents. To provide a pump that can prevent

The pump of the present invention solves this problem by providing a tapered part in one or both of the liner ring part of the casing and the wear ring part of the impeller, so that the minute gap formed between the two ring parts is directed toward the low pressure part side. A plurality of concave grooves are formed on the inner peripheral surface of the liner ring part, extending along the axial direction from the high pressure part side to the low pressure part side, at predetermined intervals in the circumferential direction. .

Part of the foreign matter caught in the minute gap between the two ring parts will pass from the high-pressure part through this gap to the low-pressure part, as this gap is widened by the tapered part toward the low-pressure part. The fluid that leaks little by little toward the lower pressure section is discharged toward the lower pressure section.

As a result, any foreign matter that remains in the gap will be removed.
As the impeller rotates, it is moved in the circumferential direction within the above-mentioned gap and reaches the groove, and upon reaching the groove, the groove extends from the high-pressure part side to the low-pressure part side, and this groove Since the above-mentioned gap is widened in the portion, the fluid flowing from the high-pressure portion side to the low-pressure portion side in the groove is quickly and reliably discharged to the low-pressure portion side.

Therefore, foreign matter caught between the two ring parts,
It is quickly and reliably discharged to the low-pressure part side, thereby preventing a seizing accident from occurring.

According to the present invention, the gap between the liner ring part and the wear ring part is widened in the circumferential direction toward the low pressure part side by the tapered part formed on one or both of the ring parts, and Since the grooves are partially widened at multiple positions spaced at predetermined intervals in the circumferential direction, foreign matter caught in the gaps can be quickly and reliably discharged to the low-pressure section, thereby preventing seizures. Good pump operation is expected at all times without causing problems.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a side sectional view of a centrifugal pump, in which 1 is a casing, 2 is a pump chamber formed in this casing 1, and 3 is a sectional side view of a centrifugal pump.
is an impeller rotating within this pump chamber 2.

At the suction port 4 of this pump, the inner circumferential surface of the liner ring 5 of the casing 1 and the array surface of the wear ring 6 of the impeller 3 are brought close to each other, so that the inside of the pump chamber 2, i.e., the high pressure The section A and the pump chamber 294#, that is, the low pressure section B are cut off.

The liner ring part 5 is a so-called liner ring 5 made of a different material from the casing 1 on the inner periphery of the suction port of the casing 1.
A is fitted with the shaft center aligned with the impeller 3.

Further, the wear ring portion 6 is formed so that the outer circumferential portion of the suction port of the impeller 3 is close to the inner circumferential surface of the liner ring 5a over the entire circumference.

Then, by rubbing the alignment surface of the wear ring portion 6 facing the inner circumferential surface of the liner ring 5a and the entire surface having an inclination angle of about 5°, both the ring portions 5. A small gap 7 formed between 6 and 6 is widened toward the low pressure part B side.

Further, on the inner circumferential surface of the liner ring portion 5, there is a high pressure portion A along the axis, although not shown, as shown in FIG.
A plurality of grooves 9 extending from the side to the low pressure part B side...-IJs,
They are formed at predetermined intervals in the circumferential direction.

However, with such a configuration, even if a foreign object gets caught in the minute gap 7, the minute gap 7 will be closed to the low pressure part B.
This gap 7 is widened from the high pressure part A side as it widens towards the side.
The foreign matter is easily discharged to the low pressure part B side by the fluid that leaks little by little to the low pressure part B side through the
Moreover, as a result of this, the foreign matter still remaining in the gap 7 is
When the impeller 3 is moved circumferentially within the gap T and brought into the groove 9 as the impeller 3 rotates, the flow flows in the groove 9 from the high-pressure part A side to the low-pressure part B side. 1) It is quickly and reliably discharged to the low-pressure part B side by the body, and therefore there is no possibility of seizure occurring between the liner ring part 5 of the casing 1 and the wear ring part 6 of the impeller 3. This is something that can eliminate inconveniences.

In the above embodiment, the entire outer circumferential surface of the wear ring part 6 of the impeller 3 is made into the tapered part 8, but it goes without saying that the present invention is not limited to this. , as shown in FIGS. 3 to 7.

That is, what is shown in FIGS. 3 and 4 is the casing 1
The entire inner peripheral surface of the liner ring portion 5 is a tapered portion 8.

In addition, the one shown in FIG. 5 has a tapered part 8 on the outer peripheral surface of the wear ring part 6 of the impeller 3 on the low pressure part B side, and the one shown in FIG. 6 has a liner ring of the casing 1. The half of the inner peripheral surface of the portion 5 on the low pressure portion B side is a tapered portion 8.

Further, in the one shown in FIG. 7, the half portion of the outer circumferential surface of the wear ring portion 6 on the low pressure portion B side is formed as a tapered portion 8.

In addition, in the ones shown in FIGS. 3 to 7, a plurality of grooves 9 are formed in the inner circumferential surface of the liner ring 5 (not shown in FIGS. 5 and 6). Of course.

Further, in each of the above embodiments, a case has been described in which a part of the impeller is used as a wearing part, but it goes without saying that the present invention is not limited to such a structure. It can be similarly applied to an impeller fitted with a so-called wear ring made of a different material.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing one embodiment of the present invention, Fig. 2 is a side sectional view showing a minute gap in the same embodiment, Fig. 3 is a side sectional view showing another embodiment, and Fig. 4. 3 is a view in the direction of the ■ arrow in FIG. 3, and FIGS. 5, 6, and 7 are side sectional views showing still other embodiments. 1... Casing, 3... Impeller, 5
... Liner ring part, 6 ... Wear ring part, 7 ... Minute gap, 8 ... Tapered part, 9 ... Concave groove , A... High pressure section,
B...Low pressure section.

Claims (1)

[Scope of utility model registration request] In a device in which a wear ring part of an impeller is brought close to a liner ring part of a casing to separate a high pressure part and a low pressure part, a tapered part is provided in one or both of the ring parts, so that a tapered part is provided in one or both of the ring parts, and a tapered part is provided in one or both of the ring parts. At the same time, a plurality of concave grooves extending along the axial direction from the high pressure section side to the low pressure section side are formed in the inner circumferential surface of the liner ring section in the circumferential direction. A pump characterized in that the pumps are formed at predetermined intervals.