JP2700284B2 - Starting method of vacuum pump for vacuum water collecting system - Google Patents

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 and the like. The present invention relates to a method for starting a vacuum pump of a vacuum type water collecting system which is made to collect water.

[0002]

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

[0003]

In the conventional vacuum pump starting method as described above, the starting torque of the vacuum pump is larger than the starting torque of the motor because the internal pressure of the intake pipe is negative. 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 a predetermined speed is not smooth but takes a long 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, and in extreme cases, the more difficult it becomes to start.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a vacuum pump of a vacuum type water collecting system capable of improving the acceleration at the time of starting a vacuum pump and performing a reliable and smooth start. It is an object to provide a method for starting a pump.

[0005]

In order to achieve the above object, a method for starting a vacuum pump of a vacuum water collecting system according to the present invention comprises sucking and discharging air from a water collecting tank by starting a vacuum pump. In the vacuum type water collecting system for reducing the internal pressure of the water collecting tank to a negative pressure, before starting the vacuum pump, air is introduced into the suction pipe to make the inside of the suction pipe atmospheric pressure, and then the vacuum pump is started. It is characterized by the following.

In addition, an air inlet is provided in a muffler with a separator for water / water separation interposed in an exhaust pipe from the vacuum pump, and before the vacuum pump is started, the air inlet is connected to the air inlet pipe. It is preferable that the inside of the intake pipe is set to the atmospheric pressure.

[0007]

According to the present invention, the atmosphere is introduced into the suction pipe before the vacuum pump is started, and the vacuum pump is started when the suction pipe is at the atmospheric pressure. Becomes smaller than the starting torque of the motor. Therefore, in addition to reliable start-up, sufficient acceleration can be obtained, and the vehicle can be smoothly started up to a predetermined speed.

Further, by setting the inside of the intake pipe to the atmospheric pressure through the air introduction port provided in the silencer with the separator for water / water separation interposed in the exhaust pipe, start-up with excellent acceleration performance can be easily performed in a simple manner. It can be implemented.

[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 water collecting system according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a vacuum pump which is started by a motor 6 and whose suction port is connected to an upper space in a water collecting tank 3 via an intake pipe 2 and connected to an exhaust port thereof. At the end of the exhaust pipe 4, a muffler 5 with a separator for water / water separation is provided. Above silencer 5
Is connected to an air inlet 5a and a drain pipe 5b.

Reference numeral 7 denotes a bypass pipe for communicating and connecting a midway portion of the intake pipe 2 and a midway portion of the exhaust pipe 4. An electric ball valve driven and opened and closed via a motor 8 is provided at a midway portion of the bypass pipe 7. 9 are interposed. The operation of the motor 8 for opening and closing the electric ball valve 9 and the motor 6 for starting the vacuum pump 1 are controlled via a water collecting tank internal pressure judging means 11 and a timer circuit 12 which operate based on the ON operation of a switch 10. It is configured as follows.

Next, the starting direction of the vacuum pump 1 in the vacuum water collecting system having the above configuration will be described with reference to the flowchart shown in FIG. First, switch 10
Is turned on (step S1), the internal pressure determination means 11
There internal pressure set negative pressure value in the upper space of the water collecting tank 3 is operated, whether it is for example -5mmH ₂ O or less is determined (step S2). If the determination result is No, that is, if the internal pressure in the upper space of the water collecting tank 3 is equal to or higher than the set negative pressure value, the motor 6 is started to start the vacuum pump 1 (step S3), and the predetermined vacuum Let water work.

On the other hand, if the determination result in 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 muffler with separator 5 via the bypass pipe 7 and the exhaust pipe 4. Let it. As a result, the atmosphere is introduced into the intake pipe 2 as shown by a solid arrow in FIG. The first set time t1 set by the timer circuit 12 to the time until the inside of the intake pipe 2 reaches the atmospheric pressure.
Is determined (step S5), the motor 6 is started and the vacuum pump 1 is started (step S6).

After the start of the vacuum pump 1, it is determined whether or not a second set time t2 set in the timer circuit 12 has been reached (step S7). If the result of the determination is Yes, the motor The motor-operated ball valve 9 is closed via the valve 8 (step S8) and the intake pipe 2 and the air inlet 5a are closed.
Then, a predetermined suction / exhaust action from the water collecting tank 3 to the muffler with separator 5 via the intake pipe 2, the pump 1 and the exhaust pipe 4 is performed.

As described above, by starting the vacuum pump 1 after the inside of the intake pipe 2 is set to the atmospheric pressure, the starting torque becomes smaller than the starting torque of the motor 6.
Not only a reliable start-up, but also its speed rises quickly in a short time.

Although the electric ball valve 9 is used in the above embodiment, any open / close valve such as a solenoid valve may be used instead. In the above embodiment, the air inlet 5a is provided in the muffler 5 with the separator. However, the air inlet 5a may be provided in the middle of the exhaust pipe 4.

[0017]

As described above, according to the present invention, it is possible to start the vacuum pump under the atmospheric pressure by introducing the atmosphere into the intake pipe before starting the vacuum pump. The starting torque of the motor can be made smaller than that of the motor. Therefore, not only can the vacuum pump be reliably started, but also sufficient acceleration can be obtained to smoothly start up to a predetermined speed. Thereby, there is an effect that the efficiency of the predetermined vacuum water collecting operation can be realized.

In particular, when the air introduction port is provided in a silencer with a separator for water / water separation interposed in an exhaust pipe, the above-described start-up with excellent acceleration performance can be simply implemented in a simple manner. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an outline of a vacuum 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]

 DESCRIPTION OF SYMBOLS 1 Vacuum pump 2 Intake pipe 3 Water collecting tank 4 Exhaust pipe 5 Silencer with a separator 5a Atmospheric inlet 6,8 Motor 9 Electric ball valve

Claims (2)

(57) [Claims] In a vacuum type water collecting system in which air in a water collecting tank is sucked and discharged by starting a vacuum pump to make the internal pressure of the water collecting tank a negative pressure, suction is performed before starting the vacuum pump. A method for starting a vacuum pump of a vacuum water collecting system, comprising introducing atmospheric air into a pipe to make the inside of the suction pipe atmospheric pressure, and then starting a vacuum pump. 2. An air inlet is provided in a muffler with a separator for air / water separation interposed in an exhaust pipe from the vacuum pump, and before the vacuum pump is started, the air inlet and the air inlet are connected to each other. 2. The inside of the intake pipe is brought to atmospheric pressure by communication.
How to start the vacuum pump of the vacuum type water collecting system.