JP3360444B2 - Pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump device,
More specifically, the present invention relates to a pressure tank of an electric pump device.

[0002]

2. Description of the Related Art A conventional pressure tank of a pump device includes a special bolt for fixing a pump portion, a cap nut for fixing a discharge flange, and a pressure pipe for fixing a pressure switch. , And then a head plate disposed on the bottom side of the drum is welded.

In order to prevent internal corrosion of this pressure tank, a pressure pipe or a discharge flange is fixed at a discharge port of a discharge flange fixing portion, then paint is inserted through a discharge inner pipe insertion hole, and the pressure tank is rotated in all directions. Thus, a coating film is formed on the inner surface, and thereafter, the remaining paint is discharged from the discharge inner tube insertion hole.

Further, after that, the outer surface is painted and the rust prevention work is completed.

[0005]

Therefore, the number of welded parts is large and the work process is complicated, and the process of painting the inner surface is also complicated.

[0006] Further, since the coating is performed in a state where the pressure tank is sealed, quality control is insufficient, and there is a large waste of cutting the lot for each lot and performing the quality control.

Further, since it is impossible to remove paint pools, welding sparks, and the like, corrosion is promoted and the life is shortened. In addition, both the inner surface coating and the outer surface coating have a problem of waste liquid and exhaust pollution.

In order to solve such a conventional problem, it is conceivable that the pressure tank is made of a corrosion-resistant material that does not require coating with a paint.

It is conceivable to use stainless steel as the corrosion resistant material. However, the use of this stainless steel causes the following problems.

That is, in general, austenitic stainless steel is used as stainless steel in order to impart corrosion resistance. A drum and a head plate are formed using this austenitic stainless steel, and these are welded to form a pressure tank. In such a case, the welded portion is transformed into a ferrite type, and electric corrosion or pitting corrosion occurs.

[0011]

SUMMARY OF THE INVENTION The feature of the present invention is that an electric motor is provided.
The rotating shaft rotates the impeller provided in the casing.
Pump section that performs a pumping operation and discharges from the pump section
Pump device having a pressure tank for storing water to be discharged
In the pressure tank, the pressure tank has a small diameter on the back side from the opening.
A drum made of stainless steel with a step formed as a part,
End plate made of synthetic resin with packing on the outer periphery and more
And the end plate is placed on the step portion to
Curing the opening of the ram to the end plate
Packing and inner circumference of the drum should be in water-tight contact
It is to be integrated with .

[0012]

According to such a pump device, stainless steel
In order to integrate the ram and the synthetic resin or stainless steel end plate by curling, there is no need for welding work, and it is possible to abolish both internal and external painting.
Corrosion was superior to no quality control is easy and productivity pressure tank
, A long-life pump device can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2, a rotating shaft (not shown) of an electric motor 1 penetrates a casing 2, and an impeller (not shown) is fixed to the rotating shaft in the casing 2 to form a pump chamber. The upper part of the casing 2 is provided with a separation chamber 3.

A check valve 4 and a suction joint 5 are fixed to the upstream side of the casing 2 in a water-tight manner, and a commercially available valve socket is screwed to the suction joint 5 so that piping from a water source can be made. The flange 6 is fixed.

Further, the electric motor 1 and the suction joint 5 of the pump section 40 are fixed to the pressure tank 7 by special bolts 9 and nuts 10 fixed to the upper part of the pressure tank 7 via a packing 8, and a pump cover is provided so as to cover these. 41 is covered.

A discharge joint 11 is fixed to the downstream side of the separation chamber 3. When the play flange 12 is fixed to the upper part of the pressure tank 7 by a special bolt 9 and a nut 10 fixed via a packing 8, The discharge inner pipe 14 and the discharge joint 11 disposed in the pressure tank 7 through the discharge inner pipe insertion hole 13 of FIG.

A discharge port 16 is provided below the pressure tank 7, and a cap nut 17 is fixed in the vicinity of the discharge port 16 via a packing 18, and a commercially available valve socket is screwed to enable piping to each faucet. Attachable discharge flange 19 to bolt 20
It is fixed at.

At the top of the pressure tank 7, a pressure switch 21 for sensing the pressure in the pressure tank 7 and stopping the operation of the pump is connected to a pressure pipe 23 fixed to the pressure tank 7 via a packing 22. It is screwed.

The structure of the pressure tank 7 is such that special bolts 9, cap nuts 17, and pressure tubes 23 are fixed to an austenitic stainless steel drum 30 via packings 8, 18 and 22 to fix the above-mentioned components. Later, packing 3
The lower end surface of the drum 30 is integrated by curling by attaching a synthetic resin end plate 32 to which the base plate 1 is mounted, and then a base fixing leg 33 having an anchor bolt fixing hole 29 is attached to the end plate 32. .

As shown in FIG. 2, the foot 33 for fixing the foundation is accommodated in a square circumscribing the outer diameter of the large-diameter portion of the drum 30 to minimize the installation area.

Next, details of the curling portion of the drum 30 and the end plate 32 will be described with reference to FIG.

The drum 30 has a small-diameter portion 34 formed at the back side as viewed from the opening, and further has a step of a large-diameter portion 35 as an opening, and has an inner diameter Dd of the small-diameter portion 34 and an outer portion of the end plate 32. Although the relationship with the diameter Dk is set to Dd <Dk, it is preferable that the outer diameter Dk of the end plate 32 and the inner diameter of the large diameter portion 35 be substantially the same, and the outer diameter portion of the end plate 32 becomes the inner diameter portion of the large diameter portion 35. It is preferable that the dimensions be determined so that the outer diameter portion of the end plate 32 fits perfectly and fits in the step formed between the small diameter portion 34 and the large diameter portion 35.

The step formed between the small-diameter portion 34 and the large-diameter portion 35 is used when the large-diameter portion 35 (opening) of the drum 30 is curled (closed) to the mirror plate 32.
Packing 3 is provided to prevent the movement of
The lower end surface of the small diameter portion 34 of the drum 30 and the upper end surface of the outer diameter portion of the end plate 32 are in contact with each other at the upper part of the mounting portion 1.

The lower end surface of the large diameter portion 35 is curled inside the end plate 32 so that the large diameter portion 35 of the drum 30 covers the outer diameter portion of the end plate 32 on which the packing 31 is mounted, and is integrated in a watertight manner. Is planned.

The drum 3 is positioned lower than the contact between the lower end of the small diameter portion 34 of the drum 30 and the upper end of the outer diameter of the end plate 32.
A concave portion 36 is provided inside the inner diameter of the small diameter portion 34 of zero.

The recess 36 forms a reservoir for preventing sand particles sucked together with water from contacting the inner wall of the drum 30 and causing pitting.

A bolt mounting portion 37A is formed on the end plate 32, and the base fixing leg 33 is fixed by a bolt 37.

Next, an embodiment in which the end plate 32 is made of stainless steel will be described.

In FIG. 4, the end plate 32 made of austenitic stainless steel is press-worked so as to have almost the same shape as the end plate 32 made of synthetic resin shown in FIG.

Therefore, the relationship between the inner diameter Dd of the small diameter portion 34 formed on the drum 30 and the outer diameter Dk of the end plate 32 is Dd
<Dk, preferably the outer diameter Dk of the end plate 32 and the inner diameter of the large-diameter portion 35 are substantially the same, so that the outer diameter portion of the end plate 32 fits perfectly with the inner diameter portion of the large-diameter portion 35 and the small-diameter portion 34 and the large-diameter portion The dimensions are determined so that the outer diameter portion of the end plate 32 fits in the step formed between the portions 35.

The large diameter portion 35 of the drum 30 is
A step formed between the small-diameter portion 34 and the large-diameter portion 35 is also provided to prevent the end plate 32 from moving when the (opening) is curled (tightened).
The lower end surface of the small diameter portion 34 of the drum 30 and the upper end surface of the outer diameter portion of the end plate 32 are in contact with each other at the upper part of the mounting portion.

The lower end surface of the large diameter portion 35 is curled inside the end plate 32 so that the large diameter portion 35 of the drum 30 covers the outer diameter portion of the end plate 32 on which the packing 31 is mounted, and is integrated in a watertight manner. Is planned.

The drum 3 is positioned lower than the contact between the lower end of the small diameter portion 34 of the drum 30 and the upper end of the outer diameter of the end plate 32.
A concave portion 36 is provided inside the inner diameter of the small diameter portion 34 of zero.

Since the head plate 32 is made of stainless steel, the bolt mounting portion 37A is formed by being narrowed, and the base fixing leg 33 is fixed by the bolt 37.

FIG. 5 shows the small diameter portion 34 of the drum 30 and the end plate 32.
The end face of the opening of the drum 30 is extended to the inside of the end plate 32, thereby repeatedly loading the packing 36 (heat, pressure, etc.).
Water due to the generation of a gap between the end plate 32 and the drum 30 can be prevented.

FIG. 6 shows another state of the curling process. The end face of the opening of the drum 30 is formed to the lower end face of the end plate 32, and the end plate 32 and the end plate 32 caused by the repetitive load (heat, pressure, etc.) of the packing 36 are formed. This is sufficient if there is no gap between the drums 30.

As described above, since the stainless steel drum 30 and the synthetic resin or stainless steel end plate 32 are integrated by the curling process, no welding work is required, and the inner and outer coatings can be eliminated. Pressure tank 7 with excellent corrosion resistance, easy quality control and excellent productivity
, A long-life pump device can be obtained.

The small diameter portion 34 and the large diameter portion 3 of the drum 30
By contacting the end face of the step portion between 5 and the upper end face of the outer diameter of the end plate 32, it is possible to absorb a large upward force in the curling process. A pressure tank 7 can be obtained.

Further, there is a concave portion 36 provided in the end plate 32 at a position lower than the contact surface between the drum 30 and the end plate 32. Since the foreign substances contained in the pumped water do not accumulate on the contact surface, the foreign matter Thus, it is possible to obtain the pressure tank 7 in which corrosion resistance is sufficiently taken into consideration, for example, the occurrence of electrolytic corrosion and pitting corrosion can be avoided.

Although the drum 30 and the end plate 32 are made of stainless steel, it is only necessary that the drum 30 and the end plate 32 themselves have a corrosion resistance function and can be integrated by curling.

In the embodiment of the present invention, the pump device having the electric motor 1 and the pump section on the pressure tank 7 is described. However, the pump apparatus having the electric motor 1 and the pump section beside the pressure tank 7 is described. Of course, the same effect can be obtained.

[0043]

As described above, when the stainless steel drum is used,
Since the synthetic resin or stainless steel end plate is integrated by curling, there is no need for welding work, and it is possible to abolish both inner and outer coatings, and there is no corrosion, quality control is easy, and productivity is excellent. pressure tanks can be obtained pumping device life with.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump device according to an embodiment of the present invention.

FIG. 2 is a plan view of the pump device.

FIG. 3 is a sectional view of a pressure tank of the pump device.

FIG. 4 is a sectional view of a pressure tank of the pump device.

FIG. 5 is a sectional view of a main part of the pressure tank.

FIG. 6 is a sectional view of a main part of the pressure tank.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Casing, 7 ... Pressure tank, 30 ...
Drum, 31: Packing, 32: End plate, 34: Small diameter part, 35: Large diameter part, 36: Depressed part, 40: Pump part, 4
1. Pump cover.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04D 13/16 F04B 23/02

Claims (3)

(57) [Claims] 1. A pump device having a pump section in which a rotating shaft of an electric motor rotates an impeller provided in a casing to perform a pumping operation, and a pressure tank for storing water discharged from the pump section. in the pressure tank, a drum made of stainless steel to form a stepped portion in the small diameter portion of the inner side of the opening, more configuration then co the end plate made of a synthetic resin having a packing on the outer periphery
The end plate is placed on the step portion, the opening of the drum is subjected to a curling process on the end plate, and the packing is integrated with the inner periphery of the drum in a water-tight manner. And pump equipment. 2. A pump device having a pump section in which a rotating shaft of an electric motor rotates an impeller provided in a casing to perform a pumping operation, and a pressure tank for storing water discharged from the pump section. in the pressure tank, a drum made of stainless steel to form a stepped portion in the small diameter portion of the inner side of the opening, whereupon further configured as end plate made of stainless steel having a packing on the outer periphery
In both cases, the end plate is placed on the step portion, the opening of the drum is subjected to curling processing on the end plate, and the packing and the inner periphery of the drum are integrated so as to be in water-tight contact. And pump equipment. 3. The method of claim 1 or 2, pump apparatus, characterized in that the basic fixing legs constructed separately from the end plate and adapted to fixed to the end plate.