JPH0742205A - Water supply device from water reservoir - Google Patents

Abstract

PURPOSE:To facilitate the piping work and reduce the equipment cost, by connecting respective delivery pipes of two units of pump to the inflow opening of a constant pressure valve and connecting a water supply pipe extending to a faucet to the outflow opening of the constant pressure valve through a check valve. CONSTITUTION:The delivery pipes 2A, 2B of a submerged pump A, B are connected to the oppositely facing inflow openings 18 of a constant pressure valve 4 through valves 3A, 3B respectively. And a water supply pipe 7 extending to a faucet is connected to the constant pressure outflow opening 12 of the valve 4 through a check valve 5. When the faucet connected to the pipe 7 is opened during the downtime, the hydraulic pressure in the constant pressure chamber 2 of the pipe 7 and the valve 4 is lowered for an instant and then a pressure switch 7' is turned on and the pump A is operated for instance to convey water into the valve chamber X of the valve 4. Then the valve body 20 is moved downward by the differential hydraulic pressure between the inside of valve chamber X and the constant pressure chamber Z and the pushing valve 24 is separated downward from the valve seat 23 to conduct water into the pipe 7. In this way, the valves 4, 5 are used in common and hence, the piping work is easy and the equipment cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water tank which directly supplies water to a water faucet or the like at a predetermined pressure by two pumps whose operation is controlled alternately in parallel or independently. Regarding water supply equipment.

[0002]

2. Description of the Related Art The direct pressure type water supply apparatus as described above is conventionally known. When the pump is a submersible pump, as shown in FIG. 7, two pumps are provided at the bottom of the water storage tank so that they can be drawn out. The submersible pumps A and B are installed horizontally, and the discharge pipes 2A and 2B of the respective submersible pumps that project outward through the collar lids 1A and 1B that detachably close the pump inlets and outlets on the side walls of the water storage tank are opened and closed 3A respectively , 3B are connected to the inlets of the constant pressure valves 4A, 4B, and the constant pressure outlets of the constant pressure valves are connected via the check valves 5A, 5B to the two water pipes 6A, 6B. Etc. are connected to a single water pipe 7 leading to a water tap. still,
A rising part that can be separated by a flange joint 2'is provided in the middle of the discharge pipes 2A, 2B, the lids 1A, 1B are removed, and the submersible pump is pulled out of the tank, and the flange joint is removed when performing maintenance and inspection. Has become. When the pump is a land pump, as shown in FIG. 8, the on-off valves 3A and 3B are respectively connected to the suction ports of the two land pumps A and B installed outside the water tank and the bottom of the water tank. Connected by drainage pipes 8A and 8B, and the discharge pipes 2A and 2B of each pump are fixed pressure valves 4A and 4A, respectively.
4B, and two water pipes 6A and 6B connected to the constant pressure outlets of the constant pressure valves via the check valves 5A and 5B, respectively, as in the case of the submersible pump. Connect to tube 7.

[0003]

In the above-described conventional direct pressure type water supply device, only the water supply pipe 7 is common to the two pumps, and the opening / closing valves 3A and 3B are unavoidable.
Each pump requires a constant pressure valve and a check valve, and the piping is labor-intensive, increasing the cost. Also, each constant pressure valve
In order to keep the water pressure of the water supplied to the water supply pipes 6A and 6B constant, for example, when the number of open faucets connected to the water supply pipe decreased from 5 to 3, water was supplied to 2 closed pipes. Since there is a return pipe for returning excess water to the water storage tank and supplying water to the three at a constant water pressure, the return pipe 9 of each constant pressure valve is provided.
Each of A and 9B must be connected to a water tank, which makes piping more troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by sharing a constant pressure valve and a check valve for two pumps. Water in a water tank is alternated in parallel, Alternatively, in a water supply device from a water tank in which water is directly supplied to a faucet, etc. at a predetermined pressure by two pumps whose operation is controlled alternately, each discharge pipe of the two pumps is connected to one constant pressure valve. It is characterized in that it is connected to the inlet and a constant pressure outlet of the constant pressure valve is connected to a water supply pipe leading to a water supply tap or the like.

[0005]

EXAMPLE FIG. 1 shows an example in which two submersible pumps A and B are installed on the bottom of a water tank so that they can be pulled out to the outside, and a pump inlet / outlet on a side wall of the water tank is detachably closed. The discharge pipes 2A, 2B of each submersible pump penetrating the collar lids 1A, 1B are connected to the inflow ports of one constant pressure valve 4 facing each other via the on-off valves 3A, 3B, respectively. A water supply pipe 7 is connected to the constant pressure outlet via a check valve 5 to reach the water supply tap. In addition, in order to pull out the submersible pump to the outside, a rising portion which is separated by the flange joint 2'is provided in the middle of the discharge pipes 2A and 2B.

FIG. 2 shows two land pumps A, which are provided outside the water tank.
In the embodiment in which B is installed, the drain pipe 8 having the on-off valves 3A and 3B for the suction port of each pump and the bottom of the water tank, respectively.
Connect with A and 8B, connect the discharge pipes 2A and 2B of each pump to opposite inlets of one constant pressure valve 4, and then check with the constant pressure outlet of this constant pressure valve as in the case of a submersible pump. Valve 5
The water supply pipe 7 is connected via. In either case, the constant pressure valve 4 is connected to the water tank by a single return pipe 9.

A constant pressure valve suitable for use in the present invention is shown in FIGS. The constant pressure valve includes a flow rate adjusting valve 10 and a pressure adjusting valve 40 communicating with the back pressure chamber B of the flow rate adjusting valve,
The flow control valve has an outer cylinder 11 whose lower end is a constant pressure outlet 12.
And a flange 14 at the upper end, which closes the inner circumference of the outer cylinder from above and hangs concentrically in the outer cylinder, and the enlarged diameter portion 1 at the lower end
3'is an inner cylinder 13 fitted to the inner circumference of the outer cylinder on the constant pressure outlet 12, and a substantially convex lid 15 fixed to the upper end of the outer cylinder to close the inner circumference of the inner cylinder from above. A tubular water channel 17 having an annular cross section is formed between the inner circumference of the outer cylinder and the outer circumference of the inner cylinder. The outer cylinder 11 is provided with two inflow ports 18, 18 that communicate with the cylindrical water channel 17 and that face each other. Further, four water passages 19 ... Are opened around the inner cylinder 13 in the circumferential direction.

Reference numeral 20 denotes a flow rate adjusting valve body, and a piston 21 that slides up and down on the inner peripheral upper part of the inner cylinder and a pressing valve 24 that can close a valve seat 23 protruding from the lower end of the inner peripheral of the inner cylinder from below.
And a connecting rod 26 in which the piston 21 is fixed to the upper end portion and the pressing valve 24 is fixed to the lower end portion. The upper surface of the pressing valve 24 has a conical shape in which the large diameter portion of the lower end is fitted to the inner circumference of the inner cylinder. Is provided. The diameter D ₁ of the piston 21, may be the same diameter D ₂ of the valve seat 23, the diameter D ₁ preferred as sensitively operates better slightly larger than D _2. As a result, the water that has entered the tubular water passage 17 from one or both of the inlets 18 passes through the water inlets 19 of the inner cylinder, and the space between the piston 21 of the valve body 20 and the press valve 24 (valve chamber). X). When the operation of the two pumps is controlled alternately in parallel, water may enter the tubular water passage 17 from both the inlets 18 and 18. This each inlet 1
In order to allow water from 8 and 18 to smoothly enter the tubular water channel 17 at the same time, as shown in FIG. 4, the directions of the respective inlets 18 and the directions of the water passages 19 are confused so that the water entering from the respective inlets is It is preferable to collide with the arcuate wall surface 13 ″ of the cylinder which does not have the water passage port 19 and divide into two along the wall surface to enter the valve chamber X from two adjacent water passage ports 19 and 19.

In order to smoothly move the valve body 20 up and down without swinging, the diametrical cross beam 2 is provided inside the inner cylinder.
7 is provided, and the connecting rod 26 is passed through the lateral beam. Further, a stopper 28 with which the piston 21 abuts from above is provided on the inner circumference of the inner cylinder in order to determine the maximum lowered position of the valve body 20.

To assemble this flow rate adjusting valve, the inner cylinder 13
Inside, a connecting rod 26 having male threads at the upper and lower ends is penetrated, and the piston 21 is provided at the upper end of the rod and the pressing valve 24 is provided at the lower end.
Fixing the respective nuts with nuts and fitting the pistons to the upper part of the inner circumference of the inner cylinder, and inserting the inner cylinder with the valve element thus fitted into the outer cylinder 11 from above, and the flange 14 of the inner cylinder is fixed to the upper end of the outer cylinder. Is fitted into a concentric circular recess 11 ′ formed on the upper surface of the quadrangular brim and receives it, and bolts 29 are screwed into the outer cylinder from the four corners of the lid 15 having the same size as the upper flange of the outer cylinder. Tsuba Tsuba 1
4 is pressed against the outer cylinder and fixed. The maintenance and repair work is the reverse of the above and can be easily disassembled. An O-ring 30 is fitted to the outer circumference of the expanded diameter portion 13 'at the lower end of the inner cylinder fitted over the constant pressure outlet 12 on the inner circumference of the outer cylinder to perform sealing.

A vertical through hole 22 is formed in the piston 21. Further, the lid 15 has an upward concave portion 16,
A back pressure chamber Y is formed by the upward recess 16 and the inner peripheral upper portion of the inner cylinder above the piston 22. A water passage hole 31 having a diameter larger than that of the through hole 22 is provided on the side surface of the upward recessed portion 16 to connect the back pressure chamber Y to the pressure regulating valve 40.

The pressure control valve 40 includes a diaphragm 41 that receives the water pressure of the back pressure chamber Y through the water passage hole 31, a return passage 42 whose inlet is opened and closed by the diaphragm 41, and a diaphragm that closes the inlet of the return passage. The return passage 42 has a diameter larger than that of the through hole 22 of the piston, and is integrally formed on the upward recess 16 of the lid body 15. The spring 43 biases the spring 43 and the adjusting screw 44 for adjusting the spring force of the spring. Formed sideways.

The lid 15 has an annular protrusion 45 that surrounds the inlet of the return passage and protrudes in the axial direction.
Has in its center a valve 46 that abuts and closes the inlet of the return passage 42, and has the same outer diameter as the annular protrusion 45. Then, the spring 43 as a coil spring is provided in the bottomed cylindrical body 47 whose open end has the same diameter as the annular protrusion, and the pusher 4 for pushing the spring toward the diaphragm.
8, the open end of the bottomed tubular body and the annular protruding portion 45 of the lid sandwich the peripheral edge of the diaphragm 41, and penetrate the peripheral edge of the diaphragm to cover the open end of the bottomed tubular body. The bottomed cylindrical body and the diaphragm are fixed to the lid by screws screwed into the body. The adjusting screw 44 penetrates the bottom of the bottomed cylindrical body by screwing, and the pusher 48 is fixed to the inner end thereof. Therefore, the adjusting screw 36 is turned to move the pusher 48 to the left and right in the drawing in the bottomed cylinder, whereby the valve 46 at the center of the diaphragm can adjust the elasticity of the spring 43 for closing the inlet of the return passage 42. A nut 49 is screwed on the adjusting screw 44 outside the bottomed cylinder, and when the elasticity of the spring 43 is adjusted to a predetermined value by the adjusting screw, the nut 49 is tightened to the bottom of the bottomed cylinder to adjust the spring 43. Prevents the elasticity from changing unexpectedly.

The discharge pipes 2A and 2B of the pumps A and B are connected to the two inflow ports 18 and 18 in the outer cylinder (via the opening / closing valves 3A and 3B in the case of a submersible pump), and the return pipe in the lid 15 is connected. The outlet end of the passage 42 is connected to the water storage tank by the return pipe 10, and the water supply pipe 7 is connected to the lower end of the constant pressure outlet 12 below the outer cylinder via a check valve. The water pipe 7 has a pressure switch 7
'Is provided.

FIG. 3 shows a state in which all the faucets connected to the water supply pipe 7 are closed, the pressure switch 7'is turned off, and the operation of the pumps A and B is interrupted. The inlet of the return passage 42 is closed by, and the push valve 24 of the valve body 20 closes the valve seat 23 from below. The pressure adjusting valve 40 adjusts the water pressure of the water to be pressure-fed to the water supply pipe 7 to, for example, 3 atm. The discharge pressure of the pumps A and B is higher than 3 atm, for example, 5 atm, and the pressure at which the pressure switch is turned off is slightly higher than the set pressure of the pressure adjusting valve, for example, 3.5 atm. As a result, 3.1 atm of water is filled in the water supply pipe 7 from the low pressure chamber 2 in the low pressure outlet 12, and the pumps A, B
Therefore, the discharge pipes 2A and 2B, the tubular water passage 17, the valve chamber X, and the back pressure chamber Y are filled with water of 3 atm.

The pumps A and B are controlled by a single alternating operation in which the first water supply is performed by the pump A, the pump A is stopped, and the second water supply is performed by the pump B. However, the first water supply is mainly performed by the pump A, but when the water supply amount exceeds a certain amount, the pump B also follows the water supply, the water supply is stopped, and the next water supply is mainly performed by the pump B. When the water supply amount is increased to a certain level or more, the pump A may also be controlled in parallel alternating operation in which water is supplied following the pump A.

When even one faucet connected to the water supply pipe 7 is opened and water is used in the state where the pump is stopped, the water pressure in the water supply pipe and the constant pressure chamber Z drops for a moment, and the pressure switch is turned on. Pump A started operation and tubular water channel 1
7. Water of 5 atm is pumped into the valve chamber X through the water passage port 19, and the water pressure in the valve chamber increases. The valve body 20 moves downward due to the pressure difference between the water pressure in the valve chamber X and the water pressure in the constant pressure chamber Z in the constant pressure outlet, the pressing valve 24 moves downward from the valve seat 23, and the gap S is opened to form the gap S. As it occurs (see FIG. 5), water flows from the valve chamber through the constant pressure chamber to the water supply pipe 7 to replenish the water that comes out of the open faucet. Incidentally, since the taper throttle 25 is provided on the pressure valve at the beginning of the time when the pressure valve is separated from the valve seat 23, water gradually flows from the valve chamber X to the constant pressure chamber Z. Then, if the number of openings of the faucet connected to the water supply pipe increases, the valve body 20 moves further downward due to a momentary decrease in water pressure in the water supply pipe, and the gap S between the pressure valve and the valve seat increases, and The amount of water sent to the pipe will increase.

Since the back pressure chamber Y is widened by the downward movement of the valve body, the water in the valve chamber X flows into the back pressure chamber through the through hole 22, and the water pressure in the back pressure chamber exceeds the elastic force of the spring 33. Then, the diaphragm 41 is pushed by the water pressure to open the inlet of the return passage 42, and the water in the back pressure chamber is returned to the water tank by the return pipe 9,
When the water pressure in the back pressure chamber reaches 3 atm, the diaphragm closes the inlet of the return passage again. Therefore, the water pressure of the valve chamber A, the constant pressure chamber Z, and the water supply pipe 7 is maintained at the set water pressure of the pressure adjusting valve 40, and the water of the set water pressure flows out from each open faucet, and the number of opening of the faucet increases. , Water volume and water force do not weaken.

When the number of open faucets decreases, the water pressure in the water supply pipe and the constant pressure chamber Z momentarily becomes higher than the water pressure in the valve chamber A. Due to this pressure difference, the valve body 20 moves upward as shown in FIG. 6, the gap S between the valve seat 33 and the pressure valve 34 is made smaller than before, and the amount of water supplied to the water supply pipe is reduced to open. Prevents excess water from exiting the faucet. Then, the amount of water reduced in amount flows into the back pressure chamber Y from the through hole 22 of the piston 21, and when the water pressure in the back pressure chamber exceeds 3 atm, the water is returned to the water tank until it reaches 3 atm. . Therefore, from the remaining open faucet, water with stable water volume and water force will come out.

Even if all the faucets connected to the water supply pipe are closed, the operation of the pump A continues, and the water supply pipe 7 is passed through the valve chamber X and the constant pressure chamber Z.
Water is sent to. As a result, the water pressure in the water supply pipe rises, and when it rises to 3.5 atm, the pressure switch 7'is turned off, the pump operation is stopped, and the constant pressure chamber Z and the valve communicating with the back pressure chamber by the through hole of the piston are shut off. The valve body 20 rises due to the pressure difference with the chamber X, the pressing valve 24 closes the valve seat 23 from below, and the water pressure of the water supply pipe and the constant pressure chamber is maintained at 3.5 atmospheric pressure.

Next, when any of the faucets connected to the water supply pipe is opened, the pump B is operated this time. When the operations of the pumps A and B are alternately controlled in parallel, when the water supply amount exceeds a certain amount, other pumps follow the main pump. In this case, as shown in FIG. 4, the discharge pipes of both pumps are connected to the inlets 18, 18 in the outer cylinder 11, and the inlets 18, 18 and the water passages 19, 19 of the inner cylinder are different from each other. Therefore, the water discharged from both pumps is
An arcuate wall surface 13 ″ of the inner cylinder in which the water passage 19 is not opened
Collide with and are scattered in the tubular water passage 17, and then flow into the valve chamber X through the water passage 19 of the inner cylinder. Therefore, the water ejected from each inflow port does not directly collide, but smoothly flows into the valve chamber through the water passage port through the tubular water channel.

In this embodiment, as the constant pressure valve, the most suitable one was illustrated and explained. However, a constant pressure valve having only one inflow port was used, and a T-shaped cheese was attached to the inflow port, and this T type It is also possible to connect the discharge ports of both pumps A and B to a constant pressure valve via cheese.

[0023]

As is apparent from the above, according to the present invention, the constant pressure valve and the check valve are shared by the two pumps A and B, and only one return pipe is required, which facilitates piping. Equipment costs are also significantly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a water supply device of the present invention using a submersible pump.

FIG. 2 is a perspective view of a main part of a water supply device of the present invention using a land pump.

FIG. 3 is a vertical cross-sectional view of a constant pressure valve in a closed state.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a vertical cross-sectional view showing a state in which a constant pressure valve is wide open.

FIG. 6 is a longitudinal sectional view showing a state in which the opening of the constant pressure valve is changed from large to small.

FIG. 7 is a perspective view of a conventional water supply device using a submersible pump.

FIG. 8 is a perspective view of a conventional water supply device using a land pump.

[Explanation of symbols]

 A pump B pump 2A discharge pipe 2B discharge pipe 4 constant pressure valve 7 water supply pipe 12 constant pressure outlet 18 inlet

Claims (1)

[Claims] 1. A water supply device from a water tank for directly supplying water in a water tank to a water tap or the like at a predetermined pressure by two pumps whose operation is controlled alternately in parallel or independently. A water tank characterized in that each discharge pipe of a pump is connected to an inlet of a constant pressure valve, and a constant pressure outlet of the constant pressure valve is connected to a water supply pipe leading to a water tap or the like via a check valve. Water supply equipment from.