JPS63170582A - Electric pump - Google Patents

Abstract

PURPOSE:To reduce power consumption by furnishing a bypass passage equipped with a solenoid valve, and by opening it when the pressure exceeds a certain level in the condition that the fluid is flowing at a rate over a specific value. CONSTITUTION:A solenoid valve 16 is closed when a pressure switch 14 is turned off, and a bypass line 15 is shut. Then a flow rate switch 4 is turned off, and the pressure in a pressure tank 6 rises before the impeller 9 stops, and the pressure switch 14 is turned off. At this time, the solenoid valve 16 is put in ON condition, and part of the water from the discharge side is returned to the suction side via the bypass line 15. This increases the rate of flow to cause decrease in the motor load, which should reduce the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric pump, such as a Wesco pump, whose head increases as the flow rate decreases, thereby increasing the operating power.

BACKGROUND ART FIG. 5 is a functional block diagram of an electric well pump, which is an example of a conventional electric pump. Reference numeral 1 indicates the entire electric well pump, 2 indicates an impeller (not shown in the figure), and an electric well pump. The operating section is composed of a casing (omitted in the figure), a motor (not shown in the figure), etc., 3 is a suction pipe provided on the suction side of the operating section 2, and 4 is a suction pipe of the operating section 2. A flow rate switch 5 is provided in the flow path on the discharge side, 5 is a pressure switch provided in the flow path on the discharge side of the operating section 2, 6 is a pressure tank, and 7 is a faucet.

FIG. 6 is a cross-sectional view of a conventional electric well pump, where 8 is a motor shaft connected to a motor (not shown in the figure), and 9 is a Wesco-type impeller that rotates together with the motor shaft 8. The operating section 2 shown in FIG. 5 is composed of a motor shaft 8, an impeller 9, and the like. 10 is a check valve provided in a part of the suction pipe 3;
has a valve seat 10a and a valve body 10b. The flow rate switch 4 includes a magnetized float 4a that moves when water flows, and a reed switch 4b that is operated by the movement of the magnetized float 4a. 11 is a discharge pipe connected to the snake lower.

The operation of the conventional electric well pump constructed as described above will be described below with reference to the timing chart of FIG. 8.

When the user opens the snake lower, water flows and the flow rate switch 4 enters a connected state (hereinafter abbreviated as ON state). Next, when the pressure in the discharge pipe 11 and the pressure tank 6 decreases, the pressure switch 5 turns on, the impeller 9 rotates, the suction side becomes negative pressure, the check valve 10 opens, and the well (not shown in the figure) water is pumped up.

When the user closes the snake lower, the flow of water stops, so the magnetic flow (flow) 4a decreases, the reed switch 4b becomes disconnected (hereinafter referred to as OFF state), the rotation of the impeller 9 is stopped, and the backlash is prevented. Valve 10 is closed.

Problems to be Solved by the Invention However, in the conventional configuration described above, when the user opens the faucet only slightly and only a small amount of flow is flowing, the work is performed at a high head as shown in Fig. 7. Therefore, there were problems in that the amount of work required to close the flow rate switch was large (a large amount of power was consumed), and there were also problems in that a large load was placed on the motor, which could generate heat.

Means for Solving the Problems The present invention provides a bypass passage which has a solenoid valve in the middle and extends from the discharge side passage to the suction side passage. When σ exceeds a certain value, the solenoid valve is set to the σn release state and a portion of the fluid is controlled to be returned from the discharge side to the suction side.

Effect With the above configuration, when the pressure exceeds a certain value, the solenoid valve opens and some of the water is sucked in from the discharge side and returned to the bottom.
As the flow rate increases and the head decreases, the time it takes for the flow rate switch to close becomes shorter, and at the same time, the load on the motor decreases, resulting in power consumption! ! ! volume and the risk of fever is reduced.

2 is the operating part, 3 is the suction pipe, 4 is the flow rate switch,
Reference numeral 11 denotes a discharge pipe, which has the same structure as the conventional example. 14 is a pressure switch provided on the discharge side and turns on when the pressure falls below a certain value; 15 is a bypass pipe for returning water from the discharge side to the suction side of the operating section 2; 16;
17 is a solenoid valve provided in the middle of the bypass pipe 15, which operates the operating part 2 when the pressure in the discharge pipe 11 decreases and the pressure switch 14 is turned on;
When the pressure switch 14 is turned off, the operation of the operating section 2 is ended, and when the pressure switch 14 is turned off, the solenoid valve 1 is turned off.
6 is in an open state.

FIG. 2 is a cross-sectional view of the electric well pump of this embodiment, with 6
is a pressure tank, 8 is a motor shaft, 9 is an impeller, 10
is a check valve, and these have the same structure as the conventional example.

The operation of the electric well pump of this embodiment constructed as described above will be explained below in accordance with the timing chart of FIG.

When the user opens the faucet and starts water flowing, the flow rate switch 4 is first turned on. Next, when the pressure in the pressure tank 6 drops below a certain value, the pressure switch is turned on.
The impeller 9 starts rotating. Then, as the impeller 9 rotates, the pressure in the pressure tank 6 increases, and water no longer flows from the operating section 2 to the pressure tank 6 (then the flow rate switch 4 turns OFF, and the impeller 9 stops rotating).

When the pressure switch 14 is turned on, the solenoid valve 16 is turned off, and the bypass line 15 is closed. Next, the flow rate switch 4 is turned OFF, and before the rotation of the impeller 9 stops, the pressure in the pressure tank 6 rises and the pressure switch 14 is turned OFF, but at this time, the solenoid valve 16 is turned ON, and the bypass pipe 15, a portion of the water discharged from the discharge side returns to the suction side.

Therefore, when a user uses only a small amount of water, an electric well pump rotates with a lower head and lower power compared to conventional pumps, requiring less energy and reducing power consumption. can.

Effects of the Invention The present invention provides a bypass passage that has a solenoid valve in the middle and extends from the discharge side passage to the suction passage. When the pressure exceeds a certain value, the solenoid valve opens and some of the water returns from the discharge side to the suction side. Since the flow returns to the suction side, the flow rate increases and the head decreases, which reduces the time it takes for the flow switch to close.At the same time, the load on the motor is reduced, which reduces power consumption and reduces the risk of heat generation. .

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of an electric well pump, which is an electric pump according to an embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a graph showing the same characteristics, FIG. 4 is a timing chart of the same, and FIG. FIG. 5 is a functional block diagram of an electric well pump, which is a conventional electric pump, FIG. 6 is a sectional view of the same, FIG. 7 is a graph showing the same characteristics, and FIG. 8 is a timing chart of the same. 2... Operating part, 3... Suction pipe, 4
...Flow rate switch, 11...Discharge pipe, 14...
・Pressure switch, 15... Bypass pipe line, 16.
... Solenoid valve, 17... Name of control means agent: Patent attorney Toshio Nakao and one other person Fig. 2 5--Yano ・I 6・--Rita'〉riδ--1-Tashik Y Fig. 7 Figure 8

Claims (1)

[Claims] A pressure switch and a flow rate switch are provided in the flow path on the discharge side, and a bypass passage is provided that has a solenoid valve in the middle and connects the flow path on the discharge side to the flow path on the suction side, so that a certain amount of fluid or more flows. 1. An electric pump characterized in that when the pressure exceeds a certain value, the solenoid valve is opened and a part of the fluid is returned from the discharge side to the suction side.