JP3127770U - Liquid transfer device - Google Patents

Abstract

Even if a liquid take-out pipe from a first tank on the suction side of a pump sucks a large amount of air, the liquid is transferred by replenishing a small amount of liquid in a second tank on the discharge side of the pump to the pump suction side. A liquid transfer device capable of easily restoring a system is provided.
The pump 4 is a non-self-priming pump, the suction side of the pump communicates with one end of a liquid extraction pipe 22 from the first tank 2, and the discharge side of the pump is provided above the second tank 3. In addition to communicating with the liquid injection pipe 32 that communicates with the inlet 31, it communicates with the first tank 2 via the lower part of the second tank 3 and the liquid injection pipe 21 to form a transfer system, and on the suction side of the pump A small amount of liquid in the second tank 3 is replenished to the suction side of the pump in communication with the vicinity of the bottom of the second tank 3 through the liquid injection pipe 5 having a smaller diameter than the liquid take-out pipe 22 from the first tank 2. Therefore, a small amount of circulation system is formed by the second tank 3 and the pump 4 separately from the liquid sucked out from the first tank 2.
[Selection] Figure 1

Description

  The present invention relates to a liquid transfer device for transferring a liquid by a pump installed between two tanks loaded with the liquid.

  As the liquid transfer device, various devices are known. For example, the second tank is a purification tank provided with a filter medium, the first tank is used for storing purified water for use, and after use. By using a storage tank with an open top that also stores the used water containing dirt, and by circulating or transferring liquids such as water in both tanks with a pump installed between both tanks, filtration treatment can be performed constantly or intermittently. 2. Description of the Related Art Liquid transfer devices that have been applied to purify clean liquid are widely used.

  In the above liquid transfer device, the liquid is supplied by the pump from the upper open first tank loaded with the liquid, not from the bottom of the tank, but from the upper part of the liquid level of the tank to the liquid level in the tank. In this case, when an expensive self-priming pump is not used as the pump, the liquid is taken out from the tank on the suction side of the pump. If the pipe is accidentally lifted from the liquid level or the liquid level falls, a large amount of air is sucked into the liquid take-out pipe, and then the liquid level is raised even if the tip of the liquid take-out pipe is put below the liquid level. However, the liquid could not be sucked without venting the pump. As described above, there is a disadvantage that the pump does not suck air by sucking a large amount of air from the tank on the suction side of the pump or when the pump is stopped, and an expensive self-priming pump must be used. As a result, the cost of the liquid transfer device is increased, and there is a fatal defect that an inexpensive liquid transfer device cannot be provided.

  There is also a means of using a non-self-priming pump with a priming tank as a pump, which not only increases the cost for preparing the priming tank, but also automatically when priming is used by chewing air. Since water cannot be replenished, water must be manually replenished from the small inlet of the priming tank each time, which is cumbersome and has problems such as overflowing water. It was.

  In the case where a non-self-priming pump without a priming water tank is used, the present invention provides a second tank on the discharge side of the pump even if the liquid extraction pipe from the first tank on the suction side of the pump sucks a large amount of air. An object of the present invention is to provide a liquid transfer device that can easily restore the liquid supply system by replenishing a small amount of the liquid to the pump suction side.

  The present invention achieves the above-mentioned object, and is a transfer device that transfers liquid by a pump installed between two tanks filled with liquid, wherein the pump is a non-self-priming pump, and the suction side of the pump Is connected to one end of a liquid take-out pipe from the first tank, and the discharge side of the pump is connected to a liquid injection pipe connected to a liquid injection port provided in the upper part of the second tank, and below the liquid level of the second tank. A transfer system in communication with the first tank via the liquid injection pipe, and the suction side of the pump is connected to the second tank via the liquid injection pipe having a diameter smaller than that of the liquid extraction pipe from the first tank. A small circulation system is formed by the second tank and the pump separately from the liquid sucked out from the first tank by replenishing a small amount of the liquid in the second tank to the suction side of the pump in communication with the vicinity of the bottom. A liquid characterized by A transfer device.

  The pump is preferably installed below the bottom surface of the second tank, the first tank is preferably an open top type, and the second tank is preferably a sealed tank.

  According to the liquid transfer device of the present invention, an inexpensive non-self-priming pump without a priming tank is used as the pump in the liquid transfer device that transfers liquid by a pump installed between two tanks filled with liquid. Even if an unexpected accident occurs in which a large amount of air is sucked from the liquid extraction pipe from the first tank on the suction side of the pump, a small amount of liquid in the first tank on the discharge side of the pump By supplying to the liquid, it is possible to restore the liquid transfer system. That is, by providing a bypass on the suction side of the pump from the lower part of the second tank through a thin liquid take-off pipe, when the liquid is not sufficiently filled with air due to air entering the liquid take-out pipe from the first tank However, if a small amount of liquid is present at the bottom of the second tank, the liquid can be discharged from the pump by replenishing the liquid from this tank, and therefore the liquid take-out pipe from the first tank is vacuumed. In this state, the liquid is sucked into the pump from the first tank, and the idling of the pump can be avoided, and the stable liquid feeding operation can be continued.

  In the present invention, the liquid is sucked out from above the liquid level of the first open-type first tank by the pump through the liquid take-out pipe, passed through the second tank, and returned to the first tank again. Since a system for feeding liquid can be formed, if a bypass is provided on the suction side of the pump with a thin tube through which a small amount of liquid passes from the bottom of the second tank compared to the total liquid transfer amount, Even if air is sucked in from the tank, liquid is replenished from this narrow tube, so at the impeller of the pump, air is not chewed, and negative pressure is created while discharging liquid from this narrow tube with the impeller, The liquid can be pumped again from the first tank, and the liquid feeding operation can be continued.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the liquid transfer device of the present invention will be described.
In FIG. 1, reference numeral 1 denotes a liquid transfer apparatus according to the present invention. The liquid transfer apparatus 1 mainly includes a first tank 2, a second tank 3, and a pump 4 installed between the two tanks. .

  The first tank 2 is a tank in which a liquid such as water is held. For example, the first tank 2 is a storage tank that stores purified water for use and also stores used water containing dirt after use. Not limited to this. The first tank 2 is preferably an open top tank, but is not limited thereto. The first tank 2 only needs to be provided with a liquid in the lower part, and the liquid may not be loaded in the entire tank.

  The second tank 3 is a tank in which a liquid such as water is held. For example, the second tank 3 is a filtration tank provided with a filtering material or the like, but is not limited thereto. The second tank 3 is preferably a sealed tank, but is not limited thereto. The second tank 3 is provided with a liquid injection port 31 at an upper portion thereof, and communicates with a liquid injection pipe 32 that communicates with the pump 4. A liquid outlet 33 is provided near the lower portion of the second tank 3 and communicates with one end of the liquid injection pipe 21 of the first tank 2. The first tank 2 and the liquid injection pipe 21 are only required to be able to transfer liquid, and a gap may or may not exist as illustrated. The second tank 3 only needs to have a liquid above the liquid outlet 33, and the entire tank may not be filled with the liquid. The liquid outlet 33 may be in the vicinity of the bottom of the second tank 3 and may be on the bottom surface, but is not limited thereto. The liquid injection pipe 31 can be sent to another tank or the like without being circulated through the first tank 2.

  The pump 4 is installed between two tanks 2 and 3 filled with liquid, and the discharge side of the pump 4 communicates with a liquid injection pipe 32 that communicates with a liquid injection port 31 provided in the upper part of the second tank 3. Then, one end of the liquid take-out pipe 22 from the first tank 2 communicates with the suction side of the pump 4, and communicates with the first tank 2 via the lower part of the second tank 3 and the liquid injection pipe 21 to establish a transfer system. A liquid injection pipe 5 having a diameter much smaller than that of the liquid extraction pipe 22 is connected to the suction side of the pump 4 so that a part of the liquid in the second tank 3 is supplied to the pump suction side. Yes. The liquid injection pipe 5 may be connected to the vicinity of the bottom of the second tank 3 or may be connected to the liquid take-out pipe 22. It is desirable to install the pump 4 below the bottom surface of the second tank 3. In this case, it is easy to replenish a small amount of liquid from the second tank 3 to the pump 4, and always supply stably. It is possible.

  As the pump 4, an inexpensive non-self-priming pump that is not an expensive self-priming pump is used. When a non-self-priming pump is used, it is generally necessary to keep a priming water tank and use the priming water. However, in the liquid transfer device of the present invention, the liquid in the second tank 3 is used. By supplying a small amount to the pump with a thin hose, it can be reused as priming water, so a very inexpensive non-self-priming pump can be used. In this case, by setting the pump lower than the bottom surface of the second tank 3, a small amount of liquid from the bypass thin tube 5 from the second tank 3 is always supplied to the suction side of the pump. Even if air enters the liquid take-out pipe 22 from the tank 2 due to an unforeseen cause, the impeller 41 of the pump 4 discharges the air that has entered the unforeseen cause while replenishing the liquid with the narrow pipe 5 to create a negative pressure, The liquid can be sucked again from the first tank 2 and the liquid transfer system can be restored.

  It is the schematic which shows an example of the liquid transfer apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid transfer apparatus 2 1st tank 21 Liquid injection pipe 22 Liquid extraction pipe 3 2nd tank 31 Liquid injection port 32 Liquid injection pipe 33 Liquid extraction port 4 Pump 41 Impeller 5 Narrow pipe

Claims (3)

  In the transfer device for transferring liquid by a pump installed between two tanks filled with liquid, the pump is a non-self-priming pump, and the suction side of the pump communicates with one end of a liquid take-out pipe from the first tank. The discharge side of the pump communicates with a liquid injection pipe that communicates with a liquid injection port provided at the upper part of the second tank, and communicates with the first tank via the lower part of the second tank and the liquid injection pipe to establish a transfer system. Formed on the suction side of the pump and communicated with the vicinity of the bottom of the second tank through a liquid injection pipe having a diameter smaller than that of the liquid take-out pipe from the first tank. A liquid transfer apparatus characterized in that a small amount of circulation system is formed by the second tank and the pump separately from the liquid sucked from the first tank by replenishing the liquid to the side.   The liquid transfer device according to claim 1, wherein the pump is installed below the bottom surface of the second tank.   2. The liquid transfer apparatus according to claim 1, wherein the first tank is an upper open type and the second tank is a sealed tank.

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