JP2002130179A - Well pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce strain of a pressure tank by welding heat and reduction in corrosion resistance by a change in material physical properties caused when welding the pressure tank. SOLUTION: A flange part is constituted to be joined without welding a drum having a spherical ring-shaped upper part for constituting the pressure tank and a spherical ring-shaped bottom plate. A material does not change by dususing welding, so that the corrosion resistance does not reduce. Welding equipment is not required so that an inexpensive well pump can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a well pump for home use.

[0002]

2. Description of the Related Art At present, a pressure tank used in a domestic well pump is formed by processing a disc-shaped steel plate into a drum having a spherical upper portion by using a press machine. And at the top of the drum, we weld bolts for mounting the pump part,
An opening is provided for sending water pumped from the pump to the pressure tank. Further, a flange portion is formed on a side surface of the drum so as to allow piping, and supplies pumped water to the faucet.

Next, a spherical annular bottom plate forming the bottom of the pressure tank is similarly processed from a disk-shaped steel plate using a press machine.

A pressure tank is constructed by coating the inner and outer surfaces of these drums having a spherical upper portion and a spherical bottom plate in a watertight manner to prevent corrosion.

[0005] When the coating is not used, the material is stainless steel having excellent corrosion resistance.

[0006]

However, the pressure tank used in the conventional domestic well pump has a spherical annular drum and a spherical annular bottom plate welded to each other. There is a problem that cracks are likely to occur due to the metal entering and hardening, and the entire pressure tank is distorted due to deformation of the metal due to heat.

In addition, when a general steel plate is used after painting, there is a problem that painting cannot be performed unless "spatter" or "slag" due to welding is removed.

Next, even when welding is performed using a stainless steel material having excellent corrosion resistance so as not to perform painting, chromium contained in the stainless steel material is contained in the air due to the influence of heat caused by welding. The debonding phenomenon occurs due to the bonding with the carbon to be formed, and the welded portion becomes iron and the corrosion resistance is significantly reduced.

Further, in order to suppress the dechroming phenomenon, a gas is injected around the welded portion and the TIG is welded while shutting off the air.
(Tungsten Inert Gas) welding, MIG (Metal Inert Gas) welding, etc., but there is a problem that equipment and welding costs are high.

[0010] In addition, when a stainless steel material is welded, burning occurs and the color changes to seven colors, so that post-processing such as electropolishing using a chemical after welding or buffing has occurred.

[0011]

As means for solving the above-mentioned problems, as a means for solving the above-mentioned problems, a flange portion is formed on the outer periphery of a lower portion of a drum whose upper portion constitutes a pressure tank, and an outer periphery of an annular bottom plate on the bottom surface of the pressure tank is provided. A flange portion that can be connected to the flange portion on the outer periphery of the lower portion of the drum, and a water seal member for watertightness between the flange portion on the outer periphery of the lower portion of the drum and the annular bottom plate. The annular bottom plate can be screwed with screws.

Next, a folded portion is provided on the outer periphery of the lower part of the drum whose upper part is spherical, and the folded part of the outer periphery of the lower part of the drum can be fitted to the outer periphery of the annular bottom plate on the bottom surface of the pressure tank via a water seal member. And

[0013] Alternatively, a screw portion is formed on the outer periphery of the lower portion of the drum whose upper portion is spherical, and a screw portion is formed on the outer periphery of the annular bottom plate on the bottom surface of the pressure tank. The bottom plate can be screwed.

[0014]

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

The overall configuration will be described with reference to FIG.

Reference numeral 1 denotes a well pump.

A casing 16 and a casing cover 17 provided with an impeller (not shown) directly connected to a rotating shaft (not shown) of the electric motor 11 and a mechanical seal (not shown) for sealing the rotating shaft with water. The pump unit 5 is configured.

The pump section 5 has a suction pipe 14 having a suction flange 13 for connecting the well 30 and the well pump 1, and a check valve 15 is provided in the suction pipe 14. 5 is prevented from flowing back to the well 30.

On the other hand, the well water pressurized by the pump unit 5 passes through a water passage 19 and is stored in a pressure tank 7 installed below the pump unit 5. A pressure switch 6 is installed on the upper part of the pressure tank 7, and a discharge flange 18 on the side surface of the pressure tank 7, which discharges stored water and is connectable to a pipe thread specified in JIS.
Is provided.

A pump cover 8 is disposed above the pressure tank 7 so as to cover the pump section 5.

Next, the operation of the well pump 1 will be described.

When the water tap 20 is opened, the well water stored in the pressure tank 7 is discharged from the discharge flange 18.
The water then flows to the discharge pipe, and water comes out from the tap 20 of the tap water.

At this time, the air pressure inside the pressure tank 7 gradually decreases, and when the air pressure becomes constant, the pressure switch 6
Is operated (closed), and the rotating shaft and the directly connected impeller are rotated by the electric motor 11 to cause a pump action to pressurize the well water. The pressurized well water passes through the water passage 19,
It flows into the pressure tank 7.

When the water tap 20 is closed, well water in the pressure tank 7 gradually increases, and the pressure tank 7
The pressure switch 6 is operated (opened) by compressing the air in the air and increasing the pressure, and the electric motor 11 stops.

Next, the structure of the pressure tank 7 will be described with reference to FIGS.

The conventional pressure tank 7 is, as shown in FIG.
The disk-shaped steel plate is subjected to drawing using a press machine to form a drum 7a having a spherical upper portion. The bottom plate 7b serving as the bottom of the pressure tank 7 is similarly processed into a spherical shape by a press, and the drum 7a and the bottom plate 7b are welded in a watertight manner to form the pressure tank 7. Thereafter, the pressure tank 7 is coated to improve corrosion resistance. Before that, "spatter" and "slag" adhered by welding are removed and degreasing is performed, and then coating is performed. In addition, even when stainless steel with excellent corrosion resistance is used because it is not painted, chromium contained in the stainless steel combines with carbon in the air during welding and causes a dechroming phenomenon. TIG (Tungsten Inert Gas) welding, in which argon gas etc. is blown out to the welding point to prevent welding
(Metal Inert Gas) welding. However, burning occurs due to welding, so "electropolishing" or "buffing" is performed to remove the burning.

In the pressure tank 7 of the present invention, first, when a disk-shaped steel plate is drawn, a drum 7a having an annular upper portion is formed, and a drum flange 7c is formed on the outer periphery of the lower portion. Similarly, the bottom plate 7b serving as the bottom of the pressure tank 7 is similarly processed into a spherical shape by a press machine, and a bottom plate flange 7d connectable to the drum flange 7c is formed on the outer periphery, followed by painting. The drum 7a and the bottom plate 7
b is screwed watertight between the drum flange 7c and the bottom plate flange 7d by a bolt 41 via a water sealing member 40. Further, by changing the material of the drum 7a and the bottom plate 7b to stainless steel or the like having high corrosion resistance, the necessity of painting is eliminated.

Secondly, when a disk-shaped steel plate is drawn, a drum 7a having a spherical upper portion is formed, and a folded portion 7e is formed on the outer periphery of the lower portion. The bottom plate 7b serving as the bottom of the pressure tank 7 is similarly processed into a spherical shape by a press machine, and a bottom plate fitting portion 7f that can be connected to the folded portion 7e is formed on the outer periphery and painted. The drum 7a and the bottom plate 7b are fitted in a watertight manner by being press-fitted between the folded portion 7e and the bottom plate fitting portion 7f via a water sealing member 40. The drum 7a and the bottom plate 7
By changing the material of b to stainless steel or the like having high corrosion resistance, the need for painting is eliminated.

Third, when a disk-shaped steel plate is drawn, an upper portion constitutes a drum 7a having an annular shape, and a lower portion has a drum screw portion 7g formed on the outer periphery to apply a coating. Similarly, the bottom plate 7b serving as the bottom of the pressure tank 7 is similarly processed into a spherical shape by a press machine, and a bottom plate screw portion 7h connectable to the drum screw portion 7g is formed on the outer periphery and painted. The drum 7a and the bottom plate 7b are fitted in a watertight manner by being screwed between a drum screw portion 7g and a bottom plate screw portion 7h via a water sealing member 40. Further, by changing the material of the drum 7a and the bottom plate 7b to stainless steel or the like having high corrosion resistance, the necessity of painting is eliminated.

[0030]

According to the present invention as described above, since welding is not used when manufacturing a pressure tank, the corrosion resistance is reduced due to a change in the structure of the metal, post-processing after welding is not required, and the cost is reduced. And a highly reliable domestic well pump can be provided.

Further, in the above embodiment, the automatic pump using the pressure tank and the pressure switch has been described in detail, but it goes without saying that the same effect can be obtained with other household pumps.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a diagram illustrating an embodiment of the present invention.

FIG. 3 is a diagram illustrating an embodiment of the present invention.

FIG. 4 is a diagram illustrating a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Well pump, 2 ... Bag, 5 ... Pump part, 6 ... Pressure switch, 7 ... Pressure tank, 7a ... Drum, 8 ... Pump cover, 11 ... Electric motor, 13 ... Suction flange, 14 ... Suction pipe, 15 ... Reverse Stop valve, 16 casing, 17 casing cover, 18 discharge flange, 19 water passage,
20: faucet, 30: well, 40: water sealing member, 41: bolt.

Claims (3)

[Claims] 1. A pump unit having a built-in impeller driven by an electric motor is provided, and the pump unit applies a pressure to a pressure tank formed by watertightly joining a spherical drum and a spherical bottom plate by drawing. While storing the pressurized water, the well pump device including a control unit that controls the start and stop of the electric motor by the discharge pressure of the water, wherein the upper part constituting the pressure tank is provided on the outer periphery of the lower part of the spherical drum. Along with forming the flange portion, a flange portion which can be connected to the flange portion on the outer periphery of the lower portion of the drum is also formed on the outer periphery of the annular bottom plate serving as the pressure tank bottom surface,
A water sealing member is provided between the flange portion on the outer periphery of the lower portion of the drum and the annular bottom plate to make watertight, and the flange portion on the outer periphery of the lower portion of the drum and the annular bottom plate can be screwed together with screws. And well pump equipment. 2. The well pump according to claim 1, wherein a folded portion is provided on an outer periphery of the lower portion of the drum, and a folded portion of the outer periphery of the annular bottom plate serving as a bottom surface of the pressure tank is provided with a water sealing member. A well pump device characterized in that it can be fitted by fitting. 3. The well pump according to claim 1, wherein a screw portion is formed on an outer periphery of a lower portion of the drum, and a screw portion is formed on an outer periphery of a ring-shaped bottom plate on a bottom surface of the pressure tank, and the drum is formed via a water sealing member. A well pump device characterized in that the spherical bottom plate can be screwed onto a lower outer periphery.