JPH0665957A - Method for actuating vacuum pump in vacuum drainage system - Google Patents

Abstract

PURPOSE:To smoothly effect starting by introducing the atmosphere into a suction pipe before starting to make starting torque of a pump smaller than that of a motor. CONSTITUTION:A switch 10 is turned on to detect and determine the inner pressure of upper space of a drain tank 3 by means of an inner pressure determining means 11, and when the inner pressure is higher than a set negative pressure value, a vacuum pump 1 is actuated to collect water under vacuum. And when said pressure is lower than said value, a motor-operated ball valve 9 is opened to cause a suction pipe 2 to communicate with an atmosphere introducing port 5a of a silencer 5 with separator through a bypass pipe 7 and exhaust pipe 4, thereby admitting the atmosphere into the pipe 2. Next, after the lapse of a time period set by a timer circuit 12 during which the pressure in the pipe 2 becomes atmospheric pressure, a motor 6 is actuated to start the pump 1. After the start of the pump 1, after the lapse of a second time period set by the timer 12, the valve 9 is opened to effect a predetermined suction and exhaust operation from the tank 3 through the pump 1, the pipe 4 to the silencer 5. As a result, starting can be effected surely with a simple constitution and acceleration characteristics and efficiencies can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to, for example, a sewage collection system, in which the internal space of the water collection tank is made negative by starting a vacuum pump, and water such as sewage is efficiently stored in the tank. The present invention relates to a method for starting a vacuum pump of a vacuum type water collection system, which is adapted to collect water.

[0002]

2. Description of the Related Art In this type of vacuum type water collection system,
In starting the vacuum pump, conventionally, the vacuum pump was started while the intake pipe was connected to the negative pressure space of the water collection tank.

[0003]

In the conventional vacuum pump starting method as described above, since the internal pressure of the intake pipe is negative, the starting torque of the vacuum pump is larger than the starting torque of the motor. That is, since the starting torque of the motor is relatively small, there is a problem that the acceleration performance is poor and the rise to the predetermined speed is not smooth and takes time.
In particular, the larger the negative pressure value of the water collecting tank, the larger the starting torque of the vacuum pump, and the more difficult it becomes to start the motor.

The present invention has been made in view of the above circumstances, and the vacuum of a vacuum type water collecting system which has good acceleration performance at the time of starting the vacuum pump and can perform a reliable and smooth start. It is an object to provide a pump starting method.

[0005]

In order to achieve the above object, a method for starting a vacuum pump of a vacuum type water collecting system according to the present invention is to suck and discharge air in a water collecting tank by starting the vacuum pump. In a vacuum type water collection system in which the internal pressure of the water collection tank is set to a negative pressure, atmospheric air is introduced into the intake pipe to make it atmospheric pressure before starting the vacuum pump, and then the vacuum pump is started. It is characterized by that.

Further, the muffler with a separator for separating water and water, which is interposed in the exhaust pipe from the vacuum pump, is provided with an atmosphere introducing port, and the atmosphere introducing port and the intake pipe are communicated with each other before the vacuum pump is started. It is preferable that the inside of the intake pipe is set to atmospheric pressure.

[0007]

According to the present invention, the atmospheric pressure is introduced into the intake pipe before the vacuum pump is activated, and the vacuum pump is activated when the intake pipe is at atmospheric pressure. Becomes smaller than the starting torque of the motor. Therefore, not only a reliable start-up but also a sufficient acceleration is obtained, and the engine can be smoothly started up to a predetermined speed.

Further, by making the inside of the intake pipe to atmospheric pressure through the atmosphere introduction port provided in the muffler with the separator for separating water and water interposed in the exhaust pipe, the start-up excellent in acceleration is structurally simplified. It becomes possible to carry out.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a vacuum type water collecting system according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a vacuum pump, which is started by a motor 6 and has its suction port connected to an upper space in a water collection tank 3 via an intake pipe 2 and to its exhaust port. A silencer 5 with a separator for separating water and water is arranged at the end of the exhaust pipe 4. The silencer 5
An air inlet 5a and a drain pipe 5b are connected to and communicate with.

Reference numeral 7 denotes a bypass pipe which connects the midway portion of the intake pipe 2 and the midway portion of the exhaust pipe 4 to each other. The midway portion of the bypass pipe 7 is an electric ball valve which is driven and opened by a motor 8. 9 is installed. The opening / closing motor 8 of the electric ball valve 9 and the starting motor 6 of the vacuum pump 1 are operation-controlled via a water collecting tank internal pressure determination means 11 and a timer circuit 12 which are operated based on an ON operation of a switch 10. Is configured.

Next, the starting direction of the vacuum pump 1 in the vacuum type water collecting system having the above-mentioned structure will be described with reference to the flow chart shown in FIG. First, switch 10
Is turned on (step S1), the internal pressure determination means 11
Is activated to determine whether the internal pressure of the upper space of the water collection tank 3 is a set negative pressure value, for example, −5 mmH ₂ O or less (step S2). When the determination result is No, that is, when the internal pressure of the upper space of the water collection tank 3 is equal to or higher than the set negative pressure value, the motor 6 is started to activate the vacuum pump 1 (step S3), and a predetermined vacuum collection is performed. Cause water action.

On the other hand, the judgment result in the above step S2 is Y
In the case of es, the motor 8 is operated to open the electric ball valve 9 (step S4), and the intake pipe 2 is connected to the atmosphere introduction port 5a of the silencer 5 with a separator via the bypass pipe 7 and the exhaust pipe 4. Let As a result, the atmosphere is introduced into the intake pipe 2 as indicated by the solid arrow in FIG. Then, the first set time t1 set by the timer circuit 12 until the inside of the intake pipe 2 becomes atmospheric pressure.
After it is determined whether or not has reached (step S5), the motor 6 is started and the vacuum pump 1 is started (step S6).

After the vacuum pump 1 is started, it is judged whether or not the second set time t2 set in the timer circuit 12 has been reached (step S7). If the result of the judgment is Yes, the motor is The electric ball valve 9 is closed via step 8 (step S8), and the intake pipe 2 and the atmosphere introduction port 5a are closed.
The communication between the water collecting tank 3 and the silencer 5 with a separator through the intake pipe 2, the pump 1 and the exhaust pipe 4 is performed to perform a predetermined suction and exhaust action.

As described above, the starting torque of the vacuum pump 1 becomes smaller than the starting torque of the motor 6 by starting the vacuum pump 1 after the intake pipe 2 is set to the atmospheric pressure.
Not to mention a reliable start, the speed will rise rapidly in a short time.

Although the electric ball valve 9 is used in the above embodiment, any opening / closing valve such as a solenoid valve may be used instead of the electric ball valve 9. Further, in the above-mentioned embodiment, the atmosphere introduction port 5a is provided in the silencer 5 with the separator, but it may be provided in the middle of the exhaust pipe 4 other than this.

[0017]

As described above, according to the present invention, the atmosphere can be introduced into the intake pipe before the vacuum pump is started, and the vacuum pump can be started under the atmospheric pressure. The torque can be made smaller than the starting torque of the motor. Therefore, the vacuum pump can be reliably started, and sufficient acceleration can be obtained to smoothly start up to a predetermined speed. As a result, there is an effect that a predetermined efficiency of collecting water can be realized.

In particular, when the muffler with a separator for separating water and water in which the air introduction port is interposed in the exhaust pipe is provided for execution, the above-described start-up excellent in acceleration is simply and structurally implemented. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a vacuum type water collecting system according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a method for starting a vacuum pump.

[Explanation of symbols]

 1 Vacuum pump 2 Intake pipe 3 Water collection tank 4 Exhaust pipe 5 Silencer with separator 5a Atmosphere inlet 6,8 Motor 9 Electric ball valve

Claims (2)

[Claims] 1. A vacuum type water collecting system in which air in a water collecting tank is sucked and discharged by activating the vacuum pump to reduce the internal pressure of the water collecting tank to a negative pressure, prior to activating the vacuum pump. A method for starting a vacuum pump of a vacuum type water collecting system, characterized in that the atmosphere is introduced into the pipe to bring the inside of the intake pipe to atmospheric pressure and then the vacuum pump is started. 2. An air inlet is provided in a muffler with a separator for separating water and water, which is interposed in an exhaust pipe from the vacuum pump, and the air inlet and the intake pipe are connected to each other before the vacuum pump is started. 2. The inside of the intake pipe is communicated with the inside of the intake pipe to atmospheric pressure.
To start the vacuum pump of the vacuum type water collection system.