JPH09170563A - Pump protection device of pressure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To devise a pressure device on which a pump is directly connected to the middle of a piping to generate an alarm or to immediately stop driving of a pump by detecting that pressure on the primary side of the pump becomes lower than a set pressure value, not to cause nonconformity to an apparatus connected to the primary side and not to cause lowering of performance of a main device itself. SOLUTION: This device is constituted to pressurize the inside of a secondary side piping by directly connecting a pump 1 to the middle of a piping, sucking fluid from a primary side suction port of the pump 1 and discharging it from a secondary side discharge port. Additionally, a pressure detection means 3 to detect piping pressure on the suction side of the pump 1 and a means to transmit an alarm signal and/or a pump stop signal at the time when the pump suction side pressure value becomes lower than a set pressure value by comparing the pump suction side pressure value detected by the pressure detection means 3 and the previously set pressure value with each other are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump protection device for a pressurizing device connected to a pipe.

[0002]

2. Description of the Related Art
For example, there is a pressurizing device that directly connects a pump in the middle of a pipe such as a water supply pipe to pressurize the pressure in the pipe. In such a pressurizing device, other equipment may be connected to the primary side (suction side) piping of the pump. In order to operate this equipment normally, it is necessary to secure a certain pressure on the primary side of the pump. Further, if the pressurizing device itself is also operated at a low primary pressure, the performance may be significantly deteriorated.

Conventionally, in such an apparatus, there is no means for predicting or predicting the pressure drop on the primary side of the pump. Therefore, if the pump is operated even though the pressure on the primary side of the pump is low, the drop of the primary side pressure is promoted. However, there is a drawback in that the device connected to the primary side causes a problem. For example, if the primary side is a water pipe of the Waterworks Bureau, the water pressure will drop and other customers will not be supplied with water, and if a fire hydrant is connected, the problem that water cannot be discharged from the fire hydrant in an emergency such as a fire Etc. occur. Further, the performance of the pressurizing device itself may be significantly deteriorated.

The present invention has been made in view of the above points, and in a pressurizing device in which a pump is directly connected in the middle of piping, an alarm is detected when the pressure on the primary side of the pump is below a set pressure value. The pump protection of the pressurizing device that does not cause a malfunction to the equipment connected to the primary side and does not cause the performance deterioration of the device itself. The purpose is to provide a device.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 directly connects a pump in the middle of the piping,
In the pressurizing device for pressurizing the internal pressure of the secondary side pipe by sucking fluid from the primary side suction port of the pump and discharging it from the secondary side discharge port, a pressure detecting means for detecting the pipe pressure on the suction side of the pump. And a pump suction side pressure value detected by the pressure detecting means and a preset set pressure value are compared, and when the pump suction side pressure value becomes less than or equal to the set pressure value, an alarm signal and / or pump stop It is characterized in that a means for transmitting a signal is provided.

According to a second aspect of the present invention, in the pump protection device for the pressurizing device according to the first aspect, pressure setting means for setting the set pressure value is provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a pump protection device for a pressurizing device according to the present invention.

As shown in the figure, the pressurizing device has a pump 1 directly connected to the middle of a pipe 9. That is, the pipe 9 is connected to the primary suction port and the secondary discharge port of the pump 1. In such a pressurizing device, other devices 6, 7, and 8 are installed (connected) in the pipe 9 on the primary side of the pump, that is, on the suction side. In order to operate these devices 6, 7 and 8 normally and to prevent the performance of the pressurizing device itself from deteriorating, it is necessary to always maintain a certain pressure on the primary side of the pump. For this purpose, it is necessary to stop the pump by issuing an alarm when the pressure in the primary side pipe 9 becomes lower than this pressure.

On the primary side of the pump 1, a pressure detecting means 3 for detecting the pressure in the pipe 9, that is, the suction side pressure, is provided in the pipe 9. The output of the pressure detecting means 3 is connected to one input terminal of the comparator 5. Further, the output of the pressure setting means 4 is connected to the other input terminal of the comparator 5. The output of the comparator 5 is connected to the control panel 2. A motor (not shown) for driving the pump 1 is connected to the control panel 2.

The comparator 5 compares the pressure value detected by the pressure detecting means 3 with the set pressure value set by the pressure setting means 4, and if the measured pressure value (the output value of the pressure detecting means 3) is set. If it is lower than the pressure value, an alarm signal or a pump operation stop signal, and in some cases, an alarm signal and a pump stop signal are simultaneously transmitted to the control panel 2. When the control panel 2 receives these signals, it issues an alarm with a buzzer or the like, or stops the motor of the pump 1. Or, depending on the case, an alarm and a motor stop are performed at the same time. It should be noted that, of the signals from the comparator 5, particularly the alarm signal, the buzzer may be sounded directly without passing through the control panel 2.

As described above, the pump 1 is directly connected to the middle of the pipe 9, sucks the fluid from the primary side and discharges the fluid to the secondary side.
In the pressurizing device for pressurizing the pressure in the secondary side pipe 9,
When the pressure in the pipe 9 on the primary side becomes lower than the set pressure value set by the pressure setting means 4 by providing the pump protection means composed of the pressure detecting means 3, the pressure setting means 4, the control panel 2, etc. , A warning is issued from the control panel 2 and the operation of the pump 1 is stopped to cause a malfunction in the devices 6, 7 and 8 connected to the primary side, for example, the water pipe whose primary side was a water pipe of a water station. When another customer or a fire hydrant is connected to, it is possible to prevent the occurrence of a problem that the water cannot be supplied to the other customer or the water cannot be discharged from the fire hydrant due to a decrease in water pressure.

[0012]

As described above, according to the present invention, the following excellent effects can be obtained. (1) According to the present invention as set forth in claim 1, when the pump suction side pressure value becomes equal to or lower than a set pressure value, an alarm signal and / or a pump stop signal is transmitted, so that the pressure on the primary side of the pump is equal to or lower than a certain value. It is possible to prevent the above from happening, continue operation without noticing the pressure drop on the primary side, reduce the pressure more and more, and finally eliminate the drawback that causes trouble to the device connected to the primary side of the pump. You can

(2) Further, in the present pressurizing device for pressurizing the pressure in the primary side pipe directly connected to the pump, it is possible to eliminate the remarkable deterioration in performance which has conventionally occurred.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a pump protection device of a pressurizing device according to the present invention.

[Explanation of symbols]

 1 Pump 2 Control Panel 3 Pressure Detecting Means 4 Pressure Setting Means 5 Comparator 6 Other Equipment 7 Other Equipment 8 Other Equipment 9 Piping

Claims (2)

[Claims] 1. A pressurizing device for directly connecting a pump in the middle of a pipe, for sucking fluid from a primary suction port of the pump and discharging the fluid from a secondary discharge port to pressurize the pressure in the secondary pipe, The pressure detection means for detecting the pipe pressure on the suction side of the pump and the pump suction side pressure value detected by the pressure detection means are compared with a preset pressure value, and the pump suction side pressure value is the set pressure. A pump protection device for a pressurizing device, which is provided with means for transmitting an alarm signal and / or a pump stop signal when the value becomes less than or equal to a value. 2. A pump protection device for a pressurizing device according to claim 1, further comprising a pressure setting means for setting the set pressure value.