JPS5990791A - Vortex-flow pump - Google Patents

Abstract

PURPOSE:To improve the performance and reliability of operation of a vortex- flow pump, by preventing back-flow of pumped-up water from the side of a discharge port to the side of a suction port by providing a selaing member at an interstice formed between the inner surface of a casing and the outer surface of a casing cover. CONSTITUTION:A casing cover 4 is attached to an opening 3 of a casing 2 by the intermediary of a packing 5, and a disk-like impeller 8 is fixed to one end of a motor shaft 10 in a pump chamber 6 formed on the inside of the casing cover 4. When a plurality of vortex chambers 12 formed around the outer circumference of the impeller 8 are turned in a vortex-flow water passage 14, water is pumped up and the water pressure is raised. In the above arrangement, a sealing member 38 made of a material such as rubber having resiliency is provided in an interstice 34 formed between the inner surface 2B of the opening 3 of the casing 2 and the outer surface 4B of the casing cover 4. By employing such an arrangement, it is enabled to prevent back-flow of water from the side of a discharge port 26 toward a suction port 24 via the interstice 34 and to improve the performance and reliability of operation of a vortex-flow pump.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to improvements in vortex pumps, and is particularly directed to improvements in performance and reliability.

[Prior art]

In conventional vortex flow pumps, the fitting portion of the copper alloy casing cover is finished by machining.

In general, in a backflow buttock pump, the gap i provided between the impeller and the casing or casing cover is 0.05
By keeping the dimensions as small as about mm, a significant drop in performance is prevented. Therefore, unless the fitting portion is similarly made minute in size, the amount of internal leakage flowing back from the discharge port of the casing to the suction side will increase significantly, resulting in a significant drop in water filling performance. Therefore, precise machining was required to minimize the gap between the fitting parts.
In order to improve corrosion resistance, attempts were made to use synthetic resin for the casing and casing cover, but if the hygroscopic swelling or thermal expansion of the synthetic resin became larger than this minute gap, the casing cover would stick together and become difficult to remove. This caused problems such as excessive internal stress, which led to deformation and damage. Therefore, making the fitting part between the casing and casing cover minute is essential to ensure performance, but it not only reduces productivity but also makes it difficult to use synthetic resin. ing.

[Purpose of the invention]

The present invention improves the drawbacks of the prior art and improves performance by preventing pumping power from leaking from the discharge side to the suction side through the gap between the casing cover and the casing. The aim is to realize a highly reliable synthetic resin pump.

[Summary of the invention]

A feature of the present invention is that a vortex water channel communicating with a suction port and a discharge port is provided in a casing, a casing cover is provided to close the opening of the casing in a watertight manner to form a pump chamber, and a pump chamber is formed within the pump chamber. The impeller attached to the rotating shaft is housed in a gap provided between the inner periphery of the casing and the outer periphery of the casing force bar to limit internal leakage flowing back from the discharge port side to the suction port side. The main point is that a referee member is provided.

[Embodiments of the invention]

FIG. 1 is a sectional view of a pump head of a vortex pump showing an embodiment of the present invention.

In a pump chamber 6 made of synthetic resin and formed by attaching a casing cover 4 to the opening 3 of the casing 2 in a watertight manner via a backing 5, a disc-shaped impeller 8 is connected to an electric/mechanical shaft IO.
attached to the end. A plurality of vortex chambers 12 having a substantially quarter-circular cross section are formed at the outer edge of the impeller 8, and as the vortex chambers 12 rotate at high speed in the vortex waterway 14 from the suction side toward the discharge side, Pumping and pressurization are performed by the mutual action of centrifugal force and fluid frictional force. Also,
In order to prevent the pumped water from leaking to the outside from the central opening 16 of the casing 2, a well-known shaft sealing device 18 is installed.
It is attached between the machine 10 and the cage 7g 2. A minute gap 20.2 between the side surface of the impeller 8, the liner surface 2A of the casing 2, and the liner surface 4A of the casing force bar 4
2 is maintained at a minute size of about 0.05 mm to suppress internal leakage flowing back from the discharge side to the suction side. Similarly,
As shown in Figure 2, which shows the 1-II cross section of Figure 1,
The small gap 32 between the inner periphery 30 of the partition wall 28 that partitions the suction 4024 and the discharge port 2G of the vortex waterway 14 and the outer periphery of the impeller 8 is also
(It is formed at about 1.05 am.

Here, as explained in the above-mentioned prior art, suction is drawn from the p-type 1 piece 26 side through the gap 34 between the inner peripheral part 2B of the opening 3 of the casing 2 and the outer peripheral part 4B of the casing force bar 4. Preventing backflow toward the port 24 side is necessary to ensure high performance. In the front gap 34,
A sealing member having elasticity such as... is provided. As shown in FIG. 3, the four parts 36 have a substantially horseshoe-shaped cross section.
is provided on the outer peripheral portion 4B of the casing cover 4.

An elastic sealing member 38 such as a cylindrical rubber shown in FIG. 4 is housed in the recess 36, and as shown in FIG. 4
It protrudes outward more than B. When the casing cup (-4) with the dense = 1-1 member 38 installed in the groove 40 is installed in the opening 3 of the casing 2, '/l'i' as shown in FIG.
Only the outer circumference 38A of the 411 member 38 is brought into contact with the inner circumference 2B of the casing 2. Therefore.

The force required for attachment is small, and attachment and detachment work is easy.

Here, the end surface 38B of the sealing member 38 is configured to protrude beyond the liner surface 4A of the casing cover 4. Therefore, when the casing cover 4 is completely covered with the casing 2 as shown in FIG.
8A tightly adheres to the inner circumferential portion 2B of the casing 2 even more strongly. Therefore, a sufficient water sealing effect is achieved. in this way,
Gap 34 between the fitting part of the casing 2 and the casing cover 4
The backflow from the discharge port 1 old port 26 side to the suction port 24 side through the
It is completely blocked by the sealing member 38.

FIG. 7 shows experimental data showing the effects of the present invention.

The performance of the vortex pump according to the invention with a sealing element is significantly improved, as shown by the solid line. Further, since the gap 34 between the casing 2 and the casing cover 4 can be made relatively large, the dimensional accuracy of the parts is maintained, and productivity is improved. Further, since the dimensions of the gap 34 can be maintained sufficiently in consideration of swelling and thermal expansion of the casing 2- and the casing cover 4, excessive internal stress is not generated in each part, and it is easy to use synthetic resin.

In the embodiment described above, the sealing member 3 is attached to the casing cover 4.
8 was explained, but the inner peripheral part 2 of the casing 2
It may be provided in B.

〔Effect of the invention〕

As explained using the above embodiment, by implementing the present invention, internal leakage at the fitting portion of the casing and casing cover is prevented, improving water pumping performance, and ensuring a sufficient gap between the fitting portions. Since it is possible to prevent deformation of the synthetic resin part and the generation of excessive internal stress, it provides a remarkable effect in realizing a highly reliable synthetic laryngeal pump.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pump head of a vortex IT type pump showing an embodiment of the present invention, and FIG.
3 is a sectional view, FIG. 3 is a perspective view of the casing cover, FIG. 4 is a perspective view of the sealing member, and FIG. 5 is a perspective view of the casing cover. FIG. 886 is a partial cross-sectional view showing the fitting portion between the casing and the casing cover, and FIG. 7 is a graph showing the results of pumping performance experiments showing the effects of the present invention. 2... Casing, 2] 3... Inner periphery, 3... Opening, 4... Casing cover, 4B... Outer periphery, 8
... Impeller, 14... Whirlpool waterway, 24... Suction port, 26... Discharge port, Funeral/Figure ■ ] House 2 (Power

Claims (1)

[Claims] 1. A vortex formed by housing a disc-shaped impeller between a casing provided with a vortex waterway communicating with the suction port and the discharge port, and a casing cover that watertightly closes the opening of the casing. The flow type pump is characterized in that a sealing member is provided between the outer circumference of the casing cover and the inner circumference of the casing to limit leakage between the discharge port and the suction port. pump. 2. Claim 1 is characterized in that when the casing cover is fitted to the casing and at 7''C, royal power is applied to the sealing member and it bulges into the gap. Vortex flow pump.