JPS5836874Y2 - Denkiido Pump Souch - Google Patents

Description

[Detailed description of the invention] This invention integrates the valve device and pressure switch in the pump bypass flow path into the pump system, ensuring reliable operation, sharing the same components, and achieving cost advantages. It seeks to provide an electric well pump.

The details of the present invention will be explained below with reference to drawings showing one embodiment.

A Wesco type pump 1 is driven by a motor 2 and pumps well water 3 into a pipe 4. Check valve 5. Water is pumped to a discharge pipe 7 via a suction pipe 6, and the pumped water is sent to a faucet 9 via a water supply pipe 8.

A small pressure tank 10 is connected to the discharge pipe 7, and a bypass pipe 1 is connected from the discharge pipe 7 to the suction pipe 6.
1.12 forms a bypass flow path for the pump 1.

This bypass passage is provided with a main valve 13, a pressure switch 14 integrated with the main valve 13, a valve device 16 having a control valve 15 in series with the main valve 13, and a resistance valve provided in the discharge pipe 7. 17, the system is configured to control the control valve 15.

The valve device 16 has an inlet 18 and an outlet 19 as shown in FIG.
It is equipped with

The main valve 13 has a chamber 20 and a valve seat 21.
A diaphragm 22 that can freely move toward and away from the diaphragm 2
2 toward the valve seat 21.

The pressure switch 14 includes an actuator 24 that contacts the diaphragm 22 and transmits the actuation force, an actuator plate 25 that is actuated by the actuator 24, a movable contact plate 26 that snaps into action when the actuator plate 25 operates, and a fixed contact. Consisting of a plate 27 and a snap spring 28, the above spring 23
is received by the actuation plate 25, and the force of the spring 23 is transferred to the actuator 24.
The diaphragm 22 is connected to the diaphragm 22 through the diaphragm 22, and the parts thereof are shared.

In addition, the control valve 15 divides the empty room into two control rooms 29 a
, 29b.
, a spring 31 that presses the diaphragm 30, and a control valve body 33 that is connected to the diaphragm 30 with a support rod 32 and controls the flow path by entering and exiting the control chamber 29.
a, 29b are connected to the resistance valve 17 by signal pipes 34a, 34b.

As shown in FIG. 3, the resistance valve 17 has an inlet 35 that connects the discharge pipe 7 and an outlet 36 that connects the water supply pipe 8, and a valve body 38 that contacts the valve seat 37. A spring 39 that presses the valve body 38 is provided, and the signal pipe 34a of the iMIJIM valve 15 is provided.
, 34b are connected to the inlet 35 and the outlet 36.

In the above configuration, if the entire bypass flow path of the pump 1 is not considered, the water pumped by the pump 1 is sent from the water supply pipe 8 to the faucet 9.

When the faucet 9 is closed, the pressure in the discharge pipe 7 increases, and a pressure switch (not shown) connected to the discharge pipe 7 system is turned off to stop the sweater 2 and pumping of water.

Moreover, the pressure tank 10 is designed to store water by utilizing the compressibility of the air inside, and when the faucet 9 is opened, the pressure tank 1
0 of the stored water is discharged, the pressure in the discharge pipe 7 decreases, the pressure switch is activated, and the motor 2 is activated to pump water again.

As shown in Figure 4, the Wesco type pump 1 has the characteristic that the motor input current increases extremely when the pump flow rate decreases, and if the flow rate is less than Qm, the motor 2 will be damaged. The protector works to stop pump 1 and allow it to cool down.

However, in reality, it is often used at a flow rate of less than Qm.
As a countermeasure for this, the pressure tank 10 is made to have a large capacity.

That is, the difference flow rate between the amount of water used at the faucet 9 and the flow rate of the pump 1 is made to flow into the pressure tank 10, and when the pressure tank 10 is full, the pressure switch is turned off and the pump 1 is turned off.
is stopped, and while the pump 1 is stopped, water stored in the pressure tank 10 is discharged from the faucet 9, and when the stored water becomes low again, the pressure switch is turned on, the pump starts working, and water starts storing. Measures are being taken to ensure that the pump flow rate does not repeatedly drop below Qm.

The capacity of the pressure tank 10 is made considerably large to extend the on/off cycle of the pressure switch.

However, using such a large-capacity pressure tank 10 is preferable and inconvenient in terms of saving resources and producing a low-cost well pump.

For this reason, in order to reduce the size of the pressure tank 10 in these systems, means have been developed to form a bypass path to the pump 1 and to make the pump flow rate constant.

To explain the bypass flow path of this pump, the valve device 16 facing the bypass flow path senses the discharge pressure of the pump 1 in the chamber 20 of the inlet 18 section.

That is, as the faucet 9 is closed and the faucet flow rate is decreased, the pressure in the bypass passage increases, the internal pressure in the chamber 20 of the main valve 13 of the valve device 16 increases, and the pressure in the diaphragm 22 increases. The diaphragm 22 rises against the spring 23.

Then, the valve seat 21 of the main valve 13 opens, and part of the flow rate of the pump 1 flows into the bypass pipe 11, the actual device 16, and the bypass pipe 12.

As the faucet 9 is further closed, the diaphragm 22 rises and the flow rate flowing into the bypass channel increases, and overall, the flow rate of the pump 1 is kept constant without decreasing.

A spring 23 that pushes the diaphragm 22 of this main valve 13
By adjusting and peeling the force, the pressure in the chamber 20 that raises the diaphragm 22 is determined, and when the chamber 20 reaches this pressure 1, the valve seat 21 will not open.

No matter how much the flow rate of the faucet 9 is changed by this operation, the flow rate of the pump 1 will be equal to or higher than Q'a in FIG. 4 or 11 maintained at Q'a.

Q'a indicates a flow rate larger than the flow rate Qm.

In this case, since a sufficient flow rate is flowing through the resistance valve 17, the signal pipes 34a, which are present on both sides of the valve body 38,
34b is generated, and the control valve body 33 opens the flow path by the operation described later, so the fluid flows into the bypass path, and the rise of the diaphragm 22 of the main valve 13 remains within a certain range. Therefore, the pressure switch 14, which responds to the diaphragm 22, is not operated and is in the ON state.

When the resistance valve 17 that controls the valve device 16 of the bypass passage opens the faucet 9, water is generated at the inlet 35, and the valve body 38 is raised and opened, thereby sending water from the outlet 36 to the water supply pipe 8.

At this time, a static pressure difference occurs between the inlet 35 and the outlet 36, and the magnitude of the static pressure difference is determined by the spring 39 of the resistance valve 17.
determined by

That is, since the valve element 38 is pushed downward by the spring 39, when flowing water is generated, the valve element 38 is forcibly pushed up, causing water to flow, and a pressure difference corresponding to this pushing force is generated.

This pressure difference can take a nearly constant value even when the amount of water in the faucet 9 is small.

That is, when the flow rate becomes large, the valve body 38 moves upward significantly and operates to keep the pressure difference constant.

On the other hand, the control valve body 33 of the control valve 15 of the valve device 16 of the bypass passage is configured to regulate the flow rate of the bypass pipe 11.

Now, if there is even a small amount of water flowing in the faucet 9, a pressure difference will be generated in the resistance valve 17, causing the signal pipe 34a.

A pressure difference is created between the control chambers 29a, 29b, which are connected by 34b.

This pressure difference causes the diaphragm 30 to rise, and the support rod 3
The control valve body 33 coupled to the valve device 2 is pulled upward, and fluid is flowing smoothly through the flow path of the valve device 16.

If the faucet 9 is now completely closed, no water will flow through the resistance valve 17, and the pressure difference between the control chambers 29a and 29b will disappear.

Therefore, the diaphragm 30 is lowered by the force of the spring 31 of the control valve 15, and the control valve body 33 closes the flow path and prevents water from flowing.

Therefore, the flow rate of the bypass pipe 11 decreases, and the pump discharge pressure increases from the faucet flow rate QaO point in FIG.
A rising pressure acts on the diaphragm 20 of the main valve 13 connected to the diaphragm 20 of the main valve 13.

Due to this large upward movement of the diaphragm 20, the actuator 2
4, the actuating plate 25 is moved upward, and the movable contact plate 26 is moved downward by a snap action, away from the fixed contact plate 27, and opens the contact.

That is, the pressure switch 14 is turned off, the motor 2 is stopped, and the water pumping by the pump 1 is stopped.

Note that the faucet flow rate QaO point is determined by the spring 31 of the control valve 15.
This value is determined by the relationship between the pressure difference between the control chambers 29a and 29b, and the pressure difference between the control chambers 29a and 29b.

As described above, the present invention provides a piper 4 for the pump, a main valve and a control valve in this bypass path, and further controls the control valve with a resistance valve, and due to the operational relationship with the pressure switch, the amount of water used is small. The main valve of the valve device is equipped with a pressure switch in the bypass flow path, which prevents the motor current from becoming excessive without changing the discharge amount of the pump, and can be equipped with a small pressure tank. The diaphragm, spring, other diaphragm holder, casing, etc. of the main valve are used in common, and the valve is turned on and off in response to the operation of the main valve.
The main valve and pressure switch each perform independent functions, and when the faucet is closed, they work together to turn off the desired pressure switch.
This operation can be performed reliably.

In addition, the number of parts is small, and the cost can be significantly reduced, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a flow path configuration diagram of an electric well pump device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a valve device of a bypass flow path.
Figure 3 is a cross-sectional view of the resistance valve, Figure 4 is the Q of the pump system.
-H characteristic diagram. 1...Pump, 6...Suction pipe, 7...Discharge pipe, 9
...Faucet, 10...Small pressure tank, 11. 12
... Bypass pipe, 13 ... Main valve, 14 ... Pressure switch, 15 ... Control valve, 16 ... Valve device, 17.
...Resistance valve, 22...Main valve diaphragm, 23...
・The same splinter, 24... Actuator, 25... Pressure switch actuation plate, 26... Same movable contact plate, 27...
Same fixed contact plate.

Claims (1)

[Scope of utility model registration request] A Wesco-type pump, a pressure switch, a pressure tank, a bypass path for the pump, a valve device having a main valve and a control valve in series with the bypass path, and a valve device connected to a discharge pipe and configured to control the control valve by differential pressure between the valve portions. The control valve is provided with a resistance valve to control, and when a flow rate higher than a design value flows into the faucet, the control valve is opened, and when the flow rate is lower than the design value, the control valve is closed and the discharge pressure of the pump is related to the main valve. The main valve is located upstream of the control valve, and the pressure switch is connected to a bypass path so that when the control valve closes, the bottom is opened using the rising force of the main valve. An electric well pump device characterized in that it is configured by being integrally combined with a main valve.