JPH01177494A - Submerged pump device - Google Patents

Abstract

PURPOSE:To prevent rupture of a ground unit, by a method wherein a pressure reducing valve is positioned on the upper stream side of the ground unit of a pump-up pipe connected to a submerged pump body sunk in water. CONSTITUTION:A submerged pump device comprises a submerged pump body 1, a column pipe 2 connected to the submerged pump body 1, and a ground unit 3 connected to the column pipe 2 and controlling the submerged pump body 1. A pressure reducing valve 11 is located on the upper stream side of the ground unit 3 of the column pipe 2. A water pressure in the column pipe 2 can be suppressed to a low value by means of the pressure reducing valve 11. this constitution enables prevention of rupture of the ground unit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a submersible pump device used, for example, to pump water from a well.

[Conventional technology]

Fig. 3 is a schematic diagram showing a state in which a conventional submersible pump device is used in a well with a relatively deep pumping height. The submersible pump body 1 is constructed of a ground unit 3 connected to the lift pipe 2, which controls the submersible pump body 1, and the like. The ground unit 3 has a flow rate switch 4.
Accumulator 5. It consists of a pressure switch 6 and the like, and is connected to the pumping pipe 2, respectively. 7 is a discharge pipe connected to the water pump 2, and a water tap 8 is provided at the tip.

Therefore, the water pumped by the submersible pump body 1 rises up the water pump 2, passes through the flow rate switch 4, and is supplied from the water tap 8. Then, when the water tap 8 is closed, water is stored in the accumulator 5, and the pressure switch 6 is opened, and since the water volume becomes smaller than the set water volume of the flow rate switch 4, the flow rate switch 4 is also opened, and the submersible pump body 1 will be stopped. On the other hand, when the water tap 8 is opened, the water stored in the accumulator 5 is discharged and the pressure decreases, the pressure switch 6 is closed, and the submersible pump body 1 is restarted to resume pumping action.

In other words, the operation of the submersible pump main body 1 is started by the pressure gas iso-chiro, and the operation is stopped by the pressure switch 6 and the flow rate switch 4.
Automatic operation occurs when both are in the open state.

[Problem that the invention seeks to solve]

By the way, in this type of conventional submersible pump device,
The characteristics of the submersible pump body l are set to a high head so that it can be used even in deep wells. For this reason, when used in a relatively deep well, as shown in the pump characteristic line in Figure 4, the lift height from the well water surface to the aboveground unit 3 (Sl) is also large (and even at the maximum pressure Since the HDIL is not pressurized, the water pressure acting on the ground unit 3 does not become so large. In FIG. 4, Ql indicates the flow rate when the flow rate switch 4 is open, and is normally set at 3 to 46/min.

However, when this type of submersible pump device is used in a relatively shallow well as shown in Fig. 5, the lift height from the well water surface to the ground unit 3 is H3! becomes smaller, and the maximum pressure acting on the ground unit 3 increases by that amount to reach HDz, so there is a risk that the ground unit 3 will be destroyed by the water pressure. In addition, in order to solve this problem, the specifications of the submersible pump body 1 and the ground unit 3 can be changed.
If this is done, a disadvantage arises in that various parts are required depending on the lifting height.

The present invention was made in view of these circumstances, and its first aspect is
The objective is to provide a submersible pump device that can prevent the ground unit from being destroyed even when used for low lift purposes.

[Means for solving problems]

A submersible pump device according to the present invention is provided with a pressure reducing valve upstream of a ground unit of a lift pipe connected to a submersible pump body submerged in water.

[Effect]

In the present invention, the water pressure in the pumping pipe is kept low by the pressure reducing valve, so that the water pressure acting on the ground unit is prevented from increasing.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram showing the state in which the submersible pump device according to the present invention is used in a relatively shallow well, and Fig. 2 is a graph similarly showing the flow rate characteristics.
3 is a lift pipe connected to this submersible pump body 1, and 3 is a ground unit connected to this lift pipe 2 to control the submersible pump body 1.These members are no different from conventional ones. The ground unit 3 connects the lift pipe 2 with a flow rate switch 4, an accumulator 5, and a pressure switch 6 from the upstream side.
It is configured by connecting. A discharge pipe 7 having a water tap 8 at its downstream end is connected to the downstream side of the water pump 2 .

Reference numeral 11 is a pressure reducing valve which is an important part of the present invention. This pressure reducing valve has a well-known structure and is provided on the upstream side of the ground unit 3 of the lift pipe 2.

That is, the water in the lift pipe 2 is supplied to the ground unit 3 via the pressure reducing valve 11. Here, the set pressure of the pressure reducing valve 11 is set to a pressure HD that is slightly higher than the pressure HD x at which the pressure switch 6 is opened.

In the submersible pump device configured in this way, like the conventional one, the operation of the submersible pump body 1 is started by the pressure switch 6, and the operation is stopped by opening both the pressure gas isotiro and the flow rate switch 4. carried out and operated automatically. The pump characteristics of the submersible pump body 1 alone are represented by a line segment AB connecting the cut-off lift point A and the maximum flow rate B point in FIG. Here, since the pressure reducing valve 11 is provided in the lift pipe 2, if the lift height from the well water surface to the ground is HSS, then on the primary side of the pressure reducing valve 11, the pump characteristic line AB of the ice pump body 1 alone Among these, the pressure within the range of the intersection C with the set flow IQ+ of the flow rate switch 4 and the intersection with HSS acts. Further, if the intersection of the set pressure HD of the pressure reducing valve 11 and the pump characteristic line AB is E, and the intersection of the set pressure HD and the set flow rate Q is F, then the pressure reducing valve 1
The pressure acting on the secondary side of the ground unit 3, that is, the ground unit 3, is expressed by the connections F, E, and D. In other words, the pressure in the area indicated by the line segment EC that exceeds the pressure required for pumping well water is prevented from acting on the ground unit 3.

Therefore, the pressure reducing valve 11 can prevent the pressure in the water pump 2 from increasing more than necessary, and can prevent the water pressure acting on the ground unit 3 from increasing.

Moreover, since the pressure between FE is kept constant by the pressure reducing valve 11, when water is supplied at this flow rate, constant pressure water can be supplied even though the flow rate changes. Note that the smaller the lift H3t from the well water surface to the ground, the wider the flow rate range in which constant pressure water can be supplied, and the larger the lift H3, the narrower the flow rate range in which constant pressure water can be supplied.

〔Effect of the invention〕

As explained above, according to the present invention, since the pressure reducing valve is provided upstream of the ground unit of the lift pipe connected to the submersible pump body which is submerged in water, the water pressure in the lift pipe can be kept low by the pressure reducing valve. can.

Therefore, even if a submersible pump device used for high lift is used for low lift, the water pressure acting on the ground unit can be suppressed from increasing, and the ground unit can be prevented from being destroyed. . As a result, most of the parts of the submersible pump device can be made common for different pumping heights.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a state in which the submersible pump device according to the present invention is used in a shallow well, Figure 2 is a graph showing the pump characteristic line, and Figure 3 is a state in which a conventional submersible pump device is used in a deep well. FIG. 4 is a graph showing a pump characteristic line of a conventional submersible pump device, and FIG. 5 is a schematic diagram showing a conventional submersible pump device used in a shallow well. 1... Submersible pump body, 2... Lifting pipe, 3...
... Ground unit, 11... Pressure reducing valve.

Claims (1)

[Claims] A submersible pump device comprising a submersible pump body submerged in water, a lift pipe connected to the submersible pump body, and a ground unit connected to the lift pipe and controlling the submersible pump body, wherein the lift pipe is connected to the ground. A submersible pump device characterized by having a pressure reducing valve provided upstream of the unit.