JPH094590A - Pump device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a long-life pump device using a pressure tank that does not require internal coating or external coating, has easy quality control, and has excellent productivity and corrosion resistance. [Structure] The pressure tank is composed of a drum made of a corrosion resistant material and an end plate, or the pressure tank is made of a drum made of a corrosion resistant material and an end plate made of a synthetic resin, and the opening of the drum is formed. The parts were welded or curled to the end plate to be integrated, and aluminum was interposed in the vicinity of the connection part. [Effect] Because a material that is thermodynamically less base than the corrosion-resistant material that forms the drum is arranged near the connection between the drum and the end plate,
The thermodynamically base material is corroded before the corrosion resistant material, and the corrosion of the corrosion resistant material can be suppressed.

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, it relates to a pressure tank of an electric pump device.

[0002]

2. Description of the Related Art A conventional pressure tank for a pump device has 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 on a drum which constitutes the pressure tank. It is constructed by welding and then welding the end plate arranged on the bottom side of the drum.

In order to prevent internal corrosion of this pressure tank, the pressure tank and the discharge port of the discharge flange fixing portion are plugged, then paint is inserted from the discharge inner tube insertion hole and sealed to rotate the pressure tank in all directions. By doing so, a coating film is formed on the inner surface, and then the remaining paint is discharged from the discharge inner pipe insertion hole.

Further, after that, the outer surface is painted to finish the rust prevention work.

[0005]

Therefore, many welding portions complicate the working process, and the inner surface coating process is also complicated.

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

Further, since it is impossible to remove paint pools, welding sparks, etc., corrosion is accelerated and the service life is shortened. In addition, there is a problem of pollution of waste liquid and exhaust gas in both the inner coating and the outer coating.

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

It is considered that stainless steel is used as the corrosion resistant material. However, when this stainless steel is used, a small gap is generated at the connecting portion between the drum and the end plate, and this small gap portion causes corrosion. Is.

[0010]

A feature of the present invention is that a rotary shaft of an electric motor rotates an impeller provided in a casing to perform a pumping action, and water discharged from the pump unit is stored. In a pump device having a pressure tank, the pressure tank is composed of a drum and an end plate which are themselves made of a corrosion-resistant material, and a thermodynamic force closer to the connection between the drum and the end plate than the corrosion-resistant material. The pump device is characterized in that a base material is arranged in the.

[0011]

[Function] Since a material that is thermodynamically less base than the corrosion-resistant material that forms the drum is arranged near the connection between the drum and the end plate,
The thermodynamically base material is corroded before the corrosion resistant material, and the corrosion of the corrosion resistant material can be suppressed.

[0012]

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

In FIGS. 1, 2 and 3, a rotary shaft (not shown) of the electric motor 1 penetrates the casing 2 and an impeller (not shown) is fixed to the rotary shaft in the casing 2 to pump the pump. A chamber is formed, and a separation chamber 3 is provided above the casing 2. A check valve 4 and a suction joint 5 are watertightly fixed on the upstream side of the casing 2, and a suction flange 6 to which a commercially available valve socket can be screwed is attached to the suction joint 5 in order to allow piping from a water source. It 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 the special bolt 9 and the nut 10 which are fixed to the upper portion of the pressure tank 7 through the packing 8, and the pump cover covers them. 41 is covered.

A discharge joint 11 is fixed to the downstream side of the separation chamber 3, and when the play flange 12 is fixed by a special bolt 9 and a nut 10 fixed to the upper part of the pressure tank 7 via a packing 8, the pressure tank The discharge inner pipe 14 and the discharge joint 11 arranged in the pressure tank 7 through the discharge inner pipe insertion hole 13 of 7 are watertightly connected via a packing 15.

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. A commercially available valve socket is screwed to enable piping to each faucet. Attachable discharge flange 19 is bolt 20
It is fixed at.

A pressure switch 21 for detecting the pressure in the pressure tank 7 and stopping the operation of the pump is provided above the pressure tank 7 in a pressure pipe 23 fixed to the pressure tank 7 via a packing 22. It is screwed on.

The pressure tank 7 is constructed by fixing the special bolt 9, the cap nut 17, and the pressure pipe 23 to the drum 30 made of stainless steel via the packings 8, 18 and 22 for fixing the above-mentioned components. The lower end surface of the drum 30 is integrated by curling by fitting the synthetic resin end plate 32 with the packing 31 attached thereto, and then the base fixing leg portion 33 having the anchor bolt fixing hole 29 is attached to the end plate 32. is there.

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

A small diameter portion 34 is formed on the inner side of the drum 30 when viewed from the opening portion, and a step of a large diameter portion 35 which is the opening portion is further formed. The inner diameter Dd of the small diameter portion 34 and the outside of the end plate 32 are formed. The relationship with the diameter Dk is Dd <Dk, but 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 so that 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 are determined so that the outer diameter portion of the end plate 32 fits perfectly and that the outer diameter portion of the end plate 32 fits in the step portion formed between the small diameter portion 34 and the large diameter portion 35.

The step portion formed between the small-diameter portion 34 and the large-diameter portion 35 is mounted on the end plate 32 when the large-diameter portion 35 (opening) of the drum 30 is curled (wound).
Is provided to prevent movement of the packing 3
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 of No. 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 having the packing 31 mounted thereon, and is watertightly integrated. Is being pursued.

A ring-shaped aluminum 50 is mounted while the lower end surface of the small diameter portion 34 of the drum 31 and the upper end surface of the outer diameter portion of the end plate 32 are in contact with each other. Here, it is needless to say that the aluminum does not necessarily have a ring shape, and may be a thin film tape or aluminum vapor deposition.

Further, a recess 36 is provided inside the inner diameter of the small diameter portion 34 of the drum 30 at a position lower than the contact point between 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.

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

A screw mounting hole 37 is formed in the end plate 32, and the base fixing leg portion 33 is fixed by a screw 38.

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 stainless steel has the shape shown in FIG.
It is pressed so that it takes almost the same shape as.

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 made substantially the same so that the outer diameter portion of the end plate 32 fits perfectly into the inner diameter portion of the large diameter portion 35, and the small diameter portion 34 and the large diameter portion 34 The dimension is determined so that the outer diameter portion of the end plate 32 is accommodated in the step portion formed between the portions 35.

The end plate 32 has a large diameter portion 35 of the drum 30.
A step portion formed between the small diameter portion 34 and the large diameter portion 35 is also provided to prevent movement of the end plate 32 when curling (winding) the (opening portion), and the packing 31
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 having the packing 31 mounted thereon, and is integrated in a watertight manner. Is being pursued.

While the packing 31 is in contact with the lower end surface of the small diameter portion 34 of the drum 30 and the upper end surface of the outer diameter portion 32 of the end plate, a ring-shaped aluminum 50 is mounted. Further, the lower end surface of the small diameter portion 34 of the drum 30 and the end plate 32
A concave portion 36 is provided inside the small diameter portion 34 of the drum 30 at a position lower than the contact point of the upper end surface of the outer diameter portion.

Since the end plate 32 is made of stainless steel, the screw mounting holes 37 are narrowed to form the packing 2
The base fixing leg portion 33 is fixed by screws 38 through 4, 25.

As described above, when the stainless steel drum 30 and the synthetic resin or stainless steel end plate 32 are integrated by curling, no welding work is required and the inner and outer coatings can be eliminated. Becomes possible,
It is possible to obtain a long-life pump device using the pressure tank 7 which is free from corrosion, whose quality control is easy, and which is excellent in productivity. Further, by bringing the step end surface between the small diameter portion 34 and the large diameter portion 35 of the drum 30 into contact with the outer diameter upper end surface of the end plate 32, it is possible to absorb a large upward force in the curling process. It is possible to manufacture the pressure tank 7 with stable accuracy in addition to being manufactured by equipment.

Further, the water, which cannot be eliminated in the structure, which has entered the clearance created by the drum 30 and the end plate 32, hardly moves due to the viscosity, and crevice corrosion easily occurs there, but it is thermodynamically baser than stainless steel. Since aluminum 50, which is the material of
0 and the stainless steel of the mirror plate 32 are not eroded, but the aluminum 50 is eroded.

Further, it was found that the effect can be further maintained by setting the length from the inside of the drum to the aluminum at the contact portion between the drum and the end plate to be at least 20 mm.

It is not necessary to limit it to aluminum,
Any material that is thermodynamically less base than stainless steel may be used, and similar effects can be obtained in the vicinity of the above-mentioned connecting portion.

Further, since there is a recessed portion 36 provided on the end plate 32 lower than the contact surface between the drum 30 and the end plate 32, foreign matter contained in pumping water does not accumulate on the contact surface, so that the drum is caused by the foreign matter. It is possible to obtain the pressure tank 7 in which corrosion resistance is sufficiently taken into consideration, such as the occurrence of electrolytic corrosion and pitting corrosion of 30 can be avoided.

Although the embodiment of the present invention describes the pump device having the electric motor 1 and the pump portion on the pressure tank 7, the pump device having the electric motor 1 and the pump portion beside the pressure tank 7 will be described. Of course, the same effect can be obtained. Furthermore, although the same effect can be obtained by integrating the drum 30 and the end plate 32 by welding as shown in FIG. 5, as described above, temperature control must be thoroughly performed so that the composition of stainless steel does not change due to welding. Alternatively, it is desirable to perform heat treatment after welding.

[0040]

As described above, since the drum and the end plate made of the material having the corrosion resistance function are integrated by welding or curling, it is possible to eliminate the inner coating and the outer coating. It is possible to obtain a long-life pump device using the pressure tank 7 which is free from corrosion, whose quality control is easy, and which is excellent in productivity.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a pressure tank of the pump device.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a cross-sectional view of a pressure tank of the pump device, in which the end plate is made of stainless steel.

FIG. 5 is a cross-sectional view of a pressure tank of the pump device, which is a view formed by welding.

[Explanation of symbols]

1 ... Electric motor, 2 ... Casing, 7 ... Pressure tank, 30 ...
Drum, 31 ... Packing, 32 ... End plate, 34 ... Small diameter portion, 35 ... Large diameter portion, 36 ... Recessed portion, 40 ... Pump portion, 4
1 ... Pump cover, 50 ... Aluminum.

Claims (7)

[Claims] 1. A pump device comprising: a pump unit for rotating an impeller provided in a casing by a rotary shaft of an electric motor to perform a pumping action; and a pressure tank for storing water discharged from the pump unit. In the above, the pressure tank itself is composed of a drum and a mirror plate made of a corrosion resistant material, and a material that is thermodynamically base than the corrosion resistant material is arranged in the vicinity of a connecting portion between the drum and the mirror plate. And a pump device. 2. The pump device according to claim 1, wherein the corrosion resistant material is stainless steel, and the thermodynamically base material is aluminum. 3. A pump device comprising a pump section for rotating an impeller provided in a casing by a rotary shaft of an electric motor to perform a pumping action, and a pressure tank for storing water discharged from the pump section. In the above, the pressure tank is constituted by a drum made of stainless steel and a mirror plate, and the drum and the mirror plate are welded to be integrated with each other. A pump device in which materials are arranged. 4. A pump device comprising a pump section for rotating an impeller provided in a casing by a rotary shaft of an electric motor to perform a pumping action, and a pressure tank for storing water discharged from the pump section. In the above, the pressure tank is composed of a drum made of a corrosion resistant material and an end plate made of a synthetic resin, and the opening of the drum is integrated with the end plate by curling,
A pump device characterized in that a material that is thermodynamically less base than the corrosion resistant material is arranged at the contact portion between the drum and the end plate in the curled portion. 5. A pump device according to claim 4, wherein the corrosion resistant material is stainless steel and the thermodynamically base material is aluminum. 6. A pump device comprising a pump portion for rotating an impeller provided in a casing by a rotary shaft of an electric motor to perform a pumping action, and a pressure tank for storing water discharged from the pump portion. In the above, the pressure tank comprises a drum made of stainless steel in which a step portion is formed with a small diameter portion on the inner side of the opening, and an end plate made of synthetic resin with packing provided on the outer periphery, and the end plate is mounted on the step portion. And the opening of the drum is subjected to curling on the end plate so that the packing and the inner circumference of the drum are in contact with each other in a watertight manner, and aluminum is disposed between the step and the packing. A pump device characterized by. 7. A pump device comprising a pump section for rotating an impeller provided in a casing by a rotating shaft of an electric motor to perform a pumping action, and a pressure tank for storing water discharged from the pump section. In the above, the pressure tank is composed of a drum made of stainless steel and an end plate made of synthetic resin, and the opening portion of the drum is integrated with the end plate by curling, and the curled portion of the drum and the end plate A pump device characterized in that aluminum is arranged in the contact portion, and a length from the inside of the drum to the aluminum at the contact portion between the drum and the end plate is set to be at least 20 mm or less.