JPS5934500A - Pump - Google Patents

Abstract

PURPOSE:To form a guide flow path without undercutting a casing and bracket to provide a compact pump by forming a bent guide flow path in the bracket and the outer periphery of an impeller such that water flow in the outer periphery of the impeller is bent forward reasonably to provide uniflux and boosting action. CONSTITUTION:The bracket 8 side wall of a guide flow path 10 has an arcuate curved surface to guide smoothly water to a forward vortex chamber 11, and the casing 7 side wall bulges outward at the outer periphery of an impeller 4 to form a guide 22 for introducing rapidly water into the vortex chamber 11 and provide uniflux for maintaining hydraulic efficiency. By devising the shape of a pump chamber 9 as above can be provided the guide flow path 10 and the vortex chamber 11 constructed to have no undercut in the bracket 8 and the casing 7 without lowering the hydraulic efficiency, and the bracket 8 and the casing 7 can be of resin moldings and die castings instead of castings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbine pump, and more particularly to a volute pump having a passage shape that allows for compactness.

Conventionally, in small pumps such as turbine pumps,
The pump head is mainly made of cast iron, and in rare cases,
Guide vanes were provided as separate resin molded products, but in either case they were expensive. This is because when trying to attach the guide vane to the casing etc., it would result in an undercut shape.
It became impossible to mold the parts in one piece with resin, so casting was the only option. -! Since the size of the pump head is determined by the maximum dimension of the water passage such as the volute chamber, it has been difficult to make it smaller and more compact.

An object of the present invention is to provide a pump that is compact, has no undercuts in the casing or bracket, and has low material and molding costs, without reducing the hydraulic efficiency of the pump.

The present invention provides a bracket for straightening and increasing pressure while bending the water flow on the outer periphery of the impeller smoothly forward.
By forming the entire curved guide channel on the outer periphery of the impeller, the guide channel can be formed without undercutting the casing or bracket, and it can be made compact.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a sectional view showing the main components, and the motor shaft 1 is
It is rotatably supported by an end bracket 2 via a bearing 3, and an impeller 4 screwed onto the tip thereof is rotated to perform the entire pumping action.

The cooling fan 5 is held on the outer periphery of the motor shaft 1 by the tightening force of the impeller 4, and is press-fitted onto the outer periphery of a fan boss 6 fixed between the bearing 3 and the impeller 4. . The impeller 4 rotates and pumps water within a pump chamber 9 between the casing 7 and the bracket 8, or the pump chamber 9 has a guide channel 10 that continues to the discharge outer periphery of the impeller 4 and is located in front of the guide channel 10. , a swirl chamber 11 provided on the casing 7 side, and a stuffing box 12 provided on the bracket 8 side behind the impeller 4 (on the right side in the figure). A gasket 13 seals water between the casing 7 and the bracket 8 on the outside of the swirl chamber 11, and the impeller 4 and the bracket 8 are sealed in the stuff ink box 12.
A water seal is provided by a shaft sealing device 14 provided between the shaft and the shaft. The impeller suction side is open to the suction port 15 of the casing 7 , and the outlet side of the swirl chamber 11 is connected to the discharge port 16 of the casing 7 . The suction port 15 is provided coaxially with the impeller 4, and the discharge port 16 is located vertically and horizontally around the center of the suction port 15 tray, as shown in FIGS. 2 to 5, and can be screwed together. There is. In addition, at the top of the bracket 8,
A plug 17 that can be screwed in and unscrewed to form a water seal is attached, and by removing the plug 17, air can be removed from the pump chamber 9 and water can be injected into the pump chamber 9. , the position of this plug 17 is above regardless of the position of the discharge port 16.

Thus, as the impeller 4 rotates, water flows through the suction port 15 → impeller 4 → guide channel 10 → swirl chamber 11 → discharge port 1
6 and pumped water.

The pump according to the embodiment has the above-mentioned discharge port 16,
The main feature is that the suction port 15 can be changed vertically and horizontally from 1 to ftTh, which has the advantage that the piping when installing the pump can be connected vertically and horizontally depending on the surrounding situation. is intended. Figures 2 to 5 show the connection state of each of these discharge pipes 18, with the base 19 always facing down, the upper side in Figure 2, the right side in Figure 3, the lower side in Figure 4, and the lower side in Figure 4. To the left in FIG. 5, discharge pipe 18f: can be connected. This movement of the discharge port 16 is made possible by rotating the casing 7 and retightening the mounting screw 20. However, according to the present invention, the shape of the passageway portion of the pump chamber 9 is devised, and the mounting screw 20
As a result, it is possible to reduce the size of the entire pump to a smaller size.

Note that the base 19 is provided integrally with the end bracket 2.

Water subjected to centrifugal force by the impeller 4 is ejected from the outer periphery of the impeller 4 into the guide channel 10. The guide flow path 10 has a shape as shown in FIG. 6, and is formed into a Himeji shape by guide vanes 21, and has a rectifying action that quickly converts the kinetic energy of water jetted from the impeller 4 into a position head. A good shape has been chosen for this purpose. This guide channel 10 has the function of rectifying the jet water from the impeller 4 before the water flow reaches the volute chamber 11, and converting the total kinetic energy into a water head more efficiently. This greatly facilitates the rectification effect within the chamber 11.

The wall on the bracket 8 side of the guide channel 10 smoothly conducts water Mj
In addition, the outer periphery of the impeller 4 and the wall on the casing 7 side protrude outward, and together with the wall of the bracket 8, the water is quickly guided to the swirl chamber 11. A guide 22 is formed to guide it. Vortex chamber 1
1, the water immediately flows into the discharge port 16 via the discharge passage 23, but the guide 22
The water in the vortex chamber 11 and the water in the volute chamber 11 are separated from each other so that they do not interfere with each other, disrupting the water flow and reducing hydraulic efficiency.

FIG. 7 is an illustration of the casing 7 seen from the impeller 4 side.
FIG. 8 is a cross-sectional view of the casing 7 in alphabetical order, and both of them show the shape of the swirl chamber 11. The vortex chamber smoothly increases its water flow cross section in the direction of ①→mouth→..., and by changing the depth between the iro and the width between the ends, the rectifying effect of the vortex chamber is achieved. has achieved its purpose. Note that W represents water flow.

By devising the shape of the pump chamber 9 as described above, the guide flow path 1o and the volute chamber 11 can be constructed without undercutting the bracket l-8 and the casing 7, without reducing the hydraulic efficiency. Therefore, the bracket 8 and the casing 7 can be made of resin molded products or gui-cast products instead of being cast products. It's a trench.
The spiral chamber 11 whose area and shape change in the circumferential direction is provided only within the casing 7 and can perform a design function independent of its positional relationship with the bracket 8.
Regardless of whether the suction port 15 is located above, below, left or right, the pumping action can be performed without affecting performance at all.

The casing 7 is attached by tightening the additional screws 20 through the attachment holes 24, but in order to make the shape more compact, the usual means is to place the attachment holes 24 as close to the entire volute chamber 11 as possible. Mounting hole 23 in this case
A full cross-sectional view is shown in FIG. 9. In the conventional case, the distance t between the motor shaft 1 and the mounting screw 20 is larger than that shown in FIG. On the other hand, in the case of FIG. 8, which is an embodiment of the present invention, kt is small. As a result, it is possible to reduce the size Pk shown in FIG. 2, making it possible to make the product more compact, reduce material costs by saving materials, and reduce molding costs.

Furthermore, in the case of the conventional example shown in FIG. 10, since the spiral chamber 11 is also formed on the bracket 8 side, there is no undercut shape, but the spiral chamber 1 is deformed in area and shape in the circumferential direction.
1 piece, only the casing 7 moves in the circumferential direction and discharge 1] 16
You can tell if it's becoming difficult to change direction.

In order to avoid this, if an attempt is made to provide the swirl chamber 11 only in the casing, an undercut shape will occur, and the only solution will be to use a cast product.

According to the present invention, it is possible to provide a pump that is compact, has no undercuts in the casing 7 or bracket 1-8, and is inexpensive in materials and molding costs, without reducing the hydraulic efficiency of the pump.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating the main parts of a pump according to an embodiment of the present invention, FIGS. 2 to 5 are illustrations of the connection state of the discharge pipe of the pump according to an embodiment of the present invention, and FIG. 6 is a single front view of the bracket, which also explains the shape of the guide flow path, FIG. 7 is a single front view of the casing, which also explains the complete shape of the volute chamber, and FIG. FIG. 9 is a sectional view illustrating the position of the screw in the embodiment of the present invention.
FIG. 0 is a sectional view illustrating the positions of mounting screws in a conventional example. 4... Impeller, 7... Casing, 8... Bracket, 9... Pump chamber, 10... Guide channel, 21...
...Guide vane, Figure I Figure 2 Figure 3/)/1 Figure 4 Figure 5 Figure 6g l Figure 7 Figure 8 (l

Claims (1)

[Claims] 1. An impeller that generates centrifugal force by rotating to perform a pumping action, a guide channel formed by guide vanes that performs a rectifying action, and a bracket that forms a pump chamber in which the impeller is located from the rear surface; In a pump having a casing formed from the front surface, the rear surface of the guide channel is formed by a curved surface that guides the water flow from the radial direction to the front direction provided on the bracket, and the front surface is formed from the outer periphery of the impeller, and the bracket of the guide channel Ponbu is characterized by being formed by guides that extend along the sides.