JPS6375395A - Pump - Google Patents

Abstract

PURPOSE:To reduce the production cost of a pump, by providing a casing with a a priming port, the location of which is at the top of the casing, approximately on the plane of rotation of the impeller of the pump so that at least a part of the impeller can be looked through said priming port. CONSTITUTION:A pump casing 1 is provided with a priming port 8 on its top, while an impeller 21 is screwed on a driving shaft 19. The priming port 8 is located approximately on the same plane as the plane of the rotation of the impeller 21, which is so constructed as to be looked from the priming port 8 through the peep hole 12d provided on an inner casing 12. The impeller 21 can be removed from its shaft by inserting a rod 26 from the priming port 8. Due to the above construction, no superfluous inserting hole is needed on the pump casing, and the manufacturing cost thereof can be reduced accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a pump used for example for drainage.

(Prior art) Generally, trash pumps used to drain water containing soil and sand at construction sites, etc. have a priming port provided at the top of a pump casing that is equipped with a water intake port and a water discharge port. A drive shaft is passed through the pump casing below the suction port and the discharge port, and an impeller is screwed to the tip of the drive shaft to send water sucked in from the suction port to the discharge port.
The pump casing is provided with a lid that can be opened at a portion facing the front surface of the impeller. In this trash pump, in order to prevent water flow from being obstructed by mud, gravel, etc. remaining inside the pump casing and from accelerating wear on the impeller, the lid is removed and the front of the impeller is opened. At the same time as opening, the impeller can be unscrewed to clean the inside of the pump casing.

However, while using this pump, due to the rotation of the drive shaft,
The impeller is screwed on very tightly, so in order to unthread the impeller from the drive shaft, one end of the rod must be secured to the impeller in the direction of rotation, and the other end of the rod must be attached with a hammer or similar tool. It is necessary to loosen the impeller by applying a sudden force in the direction of loosening it. For this reason, in conventional pumps, an insertion hole is formed in the lower part of the pump casing through which the rod is inserted, and this insertion hole is provided with a cap.

(Problems to be Solved by the Invention) Therefore, in the conventional pump, it is necessary to form an insertion hole in the lower part of the pump casing, and the manufacturing cost increases, and the insertion hole and the cap have female threads and There were problems in that a male thread had to be formed to prevent the cap from coming off due to water pressure, and a gasket had to be provided to ensure airtightness.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a priming port in the upper part of a pump casing provided with a water intake port and a water discharge port, and A drive shaft passes through the pump casing at the bottom, and an impeller that sends water sucked in from the suction port to the discharge port is screwed onto the tip of the drive shaft. In this pump, the priming port is arranged in substantially the same plane as the rotating surface of the impeller, and at least a part of the impeller can be seen through the priming port.

(Function) Therefore, in order to clean the inside of the pump casing in this invention, after removing or opening the lid and opening the part of the pump casing facing the front of the impeller, insert a rod through the priming port to clean the impeller. The impeller can be loosened by hitting the outer end of the rod with a hammer or the like to apply a sudden force in the direction of loosening the impeller, and the impeller can be removed from the open part of the pump casing. Therefore, the insertion hole formed in the pump casing in the conventional pump is omitted, making manufacturing easier and reducing manufacturing costs.

(Example) An example embodying the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a pump casing 1 is divided by a partition wall 2 into a pair of suction chamber 3 and discharge chamber 4. As shown in FIG. A suction port 5 equipped with a check valve 6 made of synthetic rubber is provided on the upper side of the suction chamber 3, and a discharge lower shown by a chain double-dashed line is provided on the upper side of the discharge chamber 4. Further, a priming port 8 having a female thread is formed in the upper part of the pump casing 1, and a cap 9 having a male thread is connected to the priming port 8 via a packing 10 so that the I! J is being worn.

An internal casing 12 is fitted into the mounting hole 11 provided at the lower part of the partition wall 2 via a packing 13, and the cylindrical portion 1
2 a is externally fitted onto a support cylinder portion 14 that projects within the discharge chamber 4 . A through hole 12d, which serves as a water passage, is formed in the upper part of the cylindrical portion 12a. Pump casing 1
An opening 15 for removing the inner casing 12 is formed on the side of the suction chamber 3, and a lid 6 for closing the opening 15 is provided so as to be detachable by a pair of knob bolts 17 (only one of which is shown). There is. Moreover, the inner casing 12
is fixed by a bolt (not shown) at a disc portion 12b forming a communication hole 18 between the suction chamber 3 and the discharge chamber 4, and is removed together when the lid 16 is removed.

A drive shaft 19 of a prime mover (not shown) passes through the discharge chamber 4 below the suction port 5 and the discharge lower so as to be located at the center of the support tube 14, and the drive shaft 19 and the pump casing 1 A mechanical seal 20 is provided between the inner circumferential surface of the engine and the inner peripheral surface of the engine to prevent water from leaking to the prime mover side.

An impeller 21 shown in FIGS. 2 and 3 is screwed onto the tip of the drive shaft 19 so as to be located within the cylindrical portion 12a of the internal casing 12. The priming port 8 is arranged in a plane that is substantially the same as the rotating surface of the impeller 21, and the impeller 21 can be seen from the priming port 8 through the through hole 12d of the internal casing 12. . As shown in FIG. 3, this impeller 21 consists of a disc-shaped main body 21a and a pair of blade pieces 21b. This prevents mud, gravel, etc. from entering the mechanical seal 20 side.

When the impeller 21 is rotated counterclockwise as shown by the solid arrow in FIG. As shown by chain arrows in the same figure, the air is sent to the discharge lower along the outer surface of each blade piece 21b. The impeller 21 is formed by applying a urethane rubber coating i'i23 with excellent wear resistance to the surface of a core metal 22, and has locking steps as locking portions at two locations on the outer periphery of the disk shape. The portion 24 is cut out.

Note that an annular wear prevention plate 25 is provided in the internal casing 12 to face the impeller 21 and prevent wear of the impeller 21, and between the blade piece 21b and this wear prevention plate 25, This wear prevention plate 25 may be damaged due to trapped gravel, etc.
This prevents the impeller 21 from wearing out quickly.

To use a pump configured as described above, first:
After installing the pump at a place where drainage is required, such as at a construction site, connect hoses to the suction port 5 and discharge lower, respectively.Next, remove the cap 9 and inject priming water from the priming port 8.
When the priming water reaches the top of the inner casing 12, the injection is stopped and the cap 9 is screwed on again.

Next, when the prime mover is started and the drive shaft 19 is rotated,
Priming water is sent to the discharge lower along the outer surfaces of both blade pieces 21b by rotation of the impeller 21. At this time, suction chamber 3
The negative pressure generated inside opens the check valve 6 as shown by the two-dot chain line in Figure 1, and water containing mud, gravel, etc. is sucked in from the suction port 5, and the water is sucked in as shown by the arrow in the figure. Chamber 3, communication hole 1
8. The liquid is discharged from the discharge lower via the discharge chamber 4.

To clean inside the pump casing 1, use the knob bolt 17
Loosen the lid 16 and open the opening 1 of the pump casing 1.
Open 5. At this time, the inner casing 12
Since it is bolted to the lid 16, it can be removed together with the lid 16.

Next, the impeller 21 is removed, but the impeller 21 is firmly screwed onto the drive shaft 19 due to the rotation of the drive shaft 19 and the resistance of water during use. For this purpose, the cap 9 is unscrewed, the rod 26 is inserted through the priming port 8 as shown by the two-dot chain line in Fig. 1.3, and the impeller 21 is rotated by hand to lock the tip of the rod 26. It is locked to the stepped portion 24. Thereafter, as shown in FIG.
7, a sudden force acts on the impeller 21 in the direction of loosening, and the impeller 21 can be loosened.

Furthermore, in this embodiment, the impeller 21 is provided with a locking step portion 24 for locking the rod 26, so that the rod 26 can be locked to the blade piece 21b as in the conventional case.

There is no risk of damage. Moreover, since the locking step portion 24 is not cut out in the entire thickness direction of the main body 21a, the main body 21a
A and the flange 12C of the internal casing 12 cooperate to maintain the prevention of mud, gravel, etc. from entering the mechanical seal 20 side.

Furthermore, since the impeller 21 of this embodiment is formed by applying an inexpensive urethane rubber coating F5T23 to the core metal 22, it is sufficient to use inexpensive cast iron for the core metal 22, and the impeller 21 can be manufactured at low cost. be able to.

Note that this invention is not limited to the above embodiments (
, for example, the impeller is made only of high chrome steel,
It is also possible to arbitrarily change the shape and structure of each part without departing from the spirit of the invention, such as by providing the lid 16 with respect to the pump casing 1 so that it can be opened and closed.

Effects of the Invention As detailed above, according to the present invention, a rod can be inserted through the priming port and locked to the impeller, and the impeller can be loosened by hitting the outer end of the rod with a hammer or the like. Unlike conventional pumps, there is no need to form extra insertion holes in the pump casing, and the pump can be manufactured easily and has the excellent effect of reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing only a pump casing of an embodiment embodying the present invention, FIG. 2 is a perspective view showing an impeller, and FIG. 3 is a front view showing the impeller.

Claims (1)

[Claims] 1. A priming port (8) is provided in the upper part of a pump casing (1) having a water inlet (5) and a water outlet (7), and A drive shaft (19) passes through the pump casing (1) below the pump casing (1), and an impeller is installed at the tip of the drive shaft (19) to send water sucked in from the suction port (5) to the discharge port (7). Screw on (21),
In a pump in which the pump casing (1) is provided with a lid (16) that can be opened at a portion facing the front surface of the impeller (21), the priming port (8) is approximately aligned with the rotating surface of the impeller (21). A pump characterized in that it is arranged in the same plane and configured so that at least a part of the impeller (21) can be seen from the priming port (8). 2. The impeller (21) is provided with a locking part (24) on the outer periphery of its main body (21a) for locking a rod (26) to warm the impeller (21). 1
Pumps listed in section. 3. The pump according to claim 1 or 2, wherein the impeller (21) has a core metal (22) coated with a urethane rubber coating (23) having excellent wear resistance.