JPH06159510A - Pressure tank - Google Patents

Abstract

PURPOSE:To follow elastic deformation of a pressure tank and to prevent gas leakage between a liquid chamber and a gas chamber by integrally constituting three parts of the liquid chamber, the gas chamber and a caulking ring. CONSTITUTION:This pressure tank used as a buffer tank for a feed water pump unit and others is constituted of a gas chamber side dome 11 and a water chamber side dome 12, and in the water chamber side dome 12, a diaphragm 14 consisting of a plastic liner 13, rubber and others is provided. The diaphragm 14 positions one end of the caulking ring 15 inside of its peripheral edge 141 and by plastic deforming the water chamber side dome 12, airtightly pressure connects and fixes the liner 13 and the diaphragm peripheral edge part 141 between the caulking ring 15 and the water chamber side dome 12. After inserting the upper end of the caulking ring 15 into an end part 111 of the gas chamber side dome 11, three of each of the end parts 111, 121 and the upper end of the caulking ring 15 are integrally connected to each other by welding and others all over their periphery. Consequently, sealing air is prevented from leaking to the side of a water chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small pressure tank used as a buffer tank for the purpose of protecting a pump such as a water supply pump unit.

[0002]

2. Description of the Related Art In a diaphragm-type pressure tank, the method of sealing and fixing a diaphragm that divides a gas chamber and a liquid chamber greatly affects the performance of the pressure tank. As shown in FIG.
In the conventional pressure tank 30, the diaphragm is fixed by mounting the diaphragm 32 and the plastic clincher 35 inside the water chamber side dome 31.
The caulking ring 33 is positioned on the inner diameter side of the peripheral edge of the water, and the portion of the caulking ring is pressed from the outside of the water chamber side dome 31 with a roller or the like to caulk, thereby plastically deforming the wall of the water chamber dome 31. The water chamber dome 31, the peripheral end of the diaphragm 32 and the caulking ring are airtightly crimped and fixed by crimping the fixing portion of the diaphragm 32 to the caulking ring. Further, the end portion 31A of the water chamber side dome 31 and the end portion 34A of the gas chamber side dome 34 are integrated by welding or the like to form the pressure tank 30.

[0003]

These pressure tanks 3
No. 0 is mounted on a pump unit by sealing a compressed gas such as nitrogen in the gas chamber by a sealing valve 36 provided on the upper gas chamber side. Then, from the system connection port 37 on the water chamber side, the water pressurized in the pump operating state is injected between the diaphragm 32 and the space on the water chamber side while compressing the enclosed gas.
When the pump is stopped, the expansion pressure of the compressed gas acts on the water swallowed through the diaphragm and discharges it. However, in the case of the pressure tank having the above structure, the water chamber side dome 31 and the gas chamber side dome 34 are slightly elastically deformed toward the outer shape side by swallowing water. At that time, since the caulking ring located inside the pressure tank is an independent component and does not follow the elastic deformation, the crimping surface of the peripheral edge of the diaphragm sandwiched between the caulking ring and the water chamber side dome. The pressure drops. Moreover, since the peripheral end portion of the diaphragm is directly exposed to the gas chamber, the structure is such that compressed gas easily enters from here, and as a result, the compressed gas on the gas chamber side leaks to the water chamber side. However, this leads to a decrease in the filling pressure and impairs the function as a pressure tank. The present invention provides a pressure tank in which even if the pressure tank is pressurized and elastically deformed, the surface pressure for clamping the peripheral edge of the diaphragm in the pressure tank does not decrease, and the enclosed compressed gas does not leak to the water chamber side or the like. The purpose is to provide.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a pressure vessel comprising a gas chamber side dome and a liquid chamber side dome, a diaphragm for partitioning the interior of the pressure vessel into a gas chamber and a liquid chamber, and a peripheral edge of the diaphragm. In a pressure tank having a caulking ring for hermetically fixing a portion inside the pressure vessel, one end of the caulking ring is positioned at a peripheral end portion of the diaphragm, and the liquid chamber side dome, the diaphragm and the caulking ring are attached to each other by caulking. In addition, it is a pressure tank in which the other end of the caulking ring and the gas chamber side dome and the liquid chamber side dome are integrally fixed.

[0005]

In the pressure tank of the present invention, since the three parts of the liquid chamber dome, the gas chamber dome and the caulking ring are integrated as described above, the caulking ring will not move even if water pressure is applied. It functions to follow the elastic deformation of the dome and the dome on the gas chamber side, and the surface pressure of the caulked portion at the peripheral end of the diaphragm does not decrease. In addition, the upper end of the caulking ring is in a state in which the three parts are integrally fixed as described above, and the lower end is in a state of being strongly caulked by the diaphragm, so that compressed gas does not easily enter the water chamber. Has become.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front partial sectional view of a pressure tank of the present invention, showing a state in which water does not flow. 2 is shown in FIG.
It is a fragmentary sectional view which shows the detail of the crimping part. In FIG. 1, a pressure adjusting valve (not shown) for adjusting the gas pressure and a cap 111 are attached to the upper part of the gas chamber side dome 11. A system connection port 121 is fixed to the lower part of the liquid chamber dome (hereinafter referred to as the water chamber dome) by a method such as welding. The system connection port 121 serves as a connection part for mounting a pressure tank to the pump unit and also serves as an inlet / outlet port for pressurized water. Inside the dome on the water chamber side, the plastic cliner 13 for the purpose of anticorrosion on the inner surface of the water chamber
And a diaphragm 14 made of an elastic material such as rubber.
Then, one end of the caulking ring 15 is located inside the peripheral end 141 of the diaphragm 14, and the water chamber side dome 12
The plastic chamber of the water chamber side dome is pressed from the outer side of the upper part of the above to plastically deform the water chamber side dome, whereby the caulking ring 15 and the water chamber side dome 12 are airtightly fixed by pressure. Next, in FIG. 2, the outer diameter of the upper end of the caulking ring 15 is set to be substantially the same as the inner diameters of the water chamber side dome 12 and the gas chamber side dome 11, and the caulking ring is attached to the end portion 111 of the gas chamber side dome 11. Insert the upper end and end 121 of the water chamber side dome 12
Is inserted until it touches the end 111 of the gas chamber side dome 11. Then, the end portion 111 of the gas chamber side dome, the end portion 121 of the water chamber side dome, and the upper portion of the caulking ring 15 are integrally fixed over the entire circumference by means such as welding.

[0007]

In the pressure tank of the present invention, the dome on the water chamber side, the dome on the gas chamber side and the caulking ring are integrated, so that the water chamber and the gas chamber expand and deform even when the pressure in the tank rises. Since the caulking follows, the surface pressure at the caulking portion of the diaphragm peripheral edge does not decrease. Further, the end portion of the diaphragm is not directly exposed to the gas chamber, so that the gas is hard to enter the water chamber side. Therefore, it is possible to provide the pressure tank in which the enclosed gas does not leak to the water chamber side.

[Brief description of drawings]

FIG. 1 is a partial front sectional view of a pressure tank showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing details of the caulking portion of FIG.

FIG. 3 is a front partial cross-sectional view showing a conventional pressure tank.

FIG. 4 is a partial cross-sectional view showing details of the caulking portion of FIG.

[Explanation of symbols]

 11 Gas Chamber Side Dome 12 Water Chamber Side Dome 13 Plastic Liner 14 Diaphragm 15 Caulking

Claims (1)

[Claims] 1. A pressure container comprising a gas chamber side dome and a liquid chamber side dome, a diaphragm partitioning the inside of the pressure container into a gas chamber and a liquid chamber, and a peripheral end portion of the diaphragm is hermetically sealed inside the pressure container. In the pressure tank having the caulking ring fixed to the one end, one end of the caulking ring is positioned at the peripheral end portion of the diaphragm, the liquid chamber side dome, the diaphragm and the caulking ring are clamped together, and the other of the caulking ring is fixed. A pressure tank characterized in that an end portion, a gas chamber side dome and a liquid chamber side dome are integrally fixed.