JPS5928146Y2 - Lifting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a liquid pumping device for draining groundwater or underground wastewater from a building, etc., to the surface, or pumping liquid from the ground or underground to a liquid storage tank on the roof of a building, etc. .

As a liquid pumping device different from the conventional one, a foot valve is installed at the tip of the suction pipe that hangs down from the liquid pump, thereby preventing backflow and air intrusion, and preventing interference with the operation of the liquid pump. However, when liquid pumping is stopped, the foot valve becomes clogged with dust or gets caught, preventing it from closing completely, allowing air to enter the suction pipe and overheating the liquid pump, rendering it unusable. Many cases occurred.

In order to prevent this, a liquid pumping device in which the foot valve was removed from the suction pipe was proposed in the past.
However, even with conventional devices in which this notebook valve is removed, there is a drawback that sufficient liquid lifting action cannot be achieved.

In other words, in a liquid pumping device in which the foot valve has been removed, when the pump in operation is stopped, the waste water in the liquid pumping pipe will naturally flow back downwards due to the pump's discharge pressure disappearing, and the water will drain into the suction pipe. However, in this case, a storage tank is placed in the piping path of the lift pipe and suction pipe so that the liquid for starting the lift pump Q is always retained in the lift pump, and when the operation is stopped, At least a part of it is stored in the drainage backflow 1 in the liquid storage tank as starting and water absorption liquid, and restarting the pump and based on this, the water suction from the suction pipe to the liquid storage tank is carried out smoothly. It is becoming more and more popular.

However, in the conventional device described above, when pumped water (drainage water) falls from the suction pipe via the liquid storage tank and flows backwards when the pump stops operating, a siphon effect occurs in the liquid storage tank, causing the liquid storage to collapse. There is a problem in that the liquid in the tank is allowed to flow down more than necessary, and as the number of restarts of the liquid pump increases, the liquid in the liquid storage tank decreases, and eventually the liquid cannot be pumped.

Furthermore, harmful gases such as methane gas that generally accumulates in underground drainage tanks may enter the liquid storage tank through the suction pipe, but the above-mentioned conventional device prevents harmful gases that have entered the liquid storage tank. Since there is no means for automatically discharging the liquid to the outside, this liquid accumulates in the liquid storage tank and becomes a so-called air pocket, which interferes with the suction action at the time of restart.

The present invention aims to solve the above-mentioned conventional difficulties, and an embodiment thereof will be described below.

Embodiment 1 The embodiment shown in FIG. 1 relates to a liquid pumping device that pumps underground wastewater, cabinets, groundwater, etc. in a building or the like to the ground and drains it. A suction pipe 2 is connected to the suction port of the pump 1, and a lower tank 3, which is a suction pipe side tank, is interposed in the middle of the suction pipe 2, and the suction pipe is connected to the suction pipe 2 through a strainer 4. After the liquid is temporarily stored in the lower tank 3, it is sent to the pump 1.

And the suction port a of the lower tank 3 that connects the suction pipe 2
is located above the suction port of the liquid pump 1, and the water supply port of the tank 3 is located approximately at the bottom of the tank 3 and opened at approximately the same height as the suction port of the liquid pump 1. It is.

Furthermore, the upper suction port a of the lower tank 3 in the housing must be located above the liquid level within the pump necessary for the pump 1 to operate, specifically above the discharge port d of the pump 1. be.

It goes without saying that an upper tank 6, which is a tank on the liquid pump side, is interposed in the middle of the liquid pump 5 of the liquid pump 1, and that the upper tank 6 is located higher than the liquid pump 1 and the lower tank 3. However, in this embodiment, the inside of one tank (drum) is partitioned by a partition wall 18 so that the upper part is an upper tank 6 and the lower part is a lower tank 3.

As shown in the figure, the vicinity of the bottom of the upper tank 6 and the vicinity of the upper end of the lower tank 3 are connected via a breathing tube 7, and when the liquid level of the lower tank 3 decreases, the upper tank 6 and the lower tank are connected to each other. 3 and when the operation of the pump 1 is stopped, the discharge pressure disappears, so the liquid (pumped water) in the pump 5 falls into the upper tank 6, and this flows into the breathing pipe 77.
5- flows into the lower tank 3 and is further returned to the water storage tank through the suction pipe 2. At this time, the liquid in the upper tank 6 falls near the bottom of the casing, and the liquid in the lower tank 3 flows into the lower tank 3. As the pressure decreases slightly from the upper end, the pressure inside the lower tank 3 becomes atmospheric through the liquid lift pipe 5 communicating with the atmosphere, the upper tank 6 and the breathing pipe 7, and the siphon acts on the lower tank/y3A-ra suction pipe 2. The liquid level in the lower tank 3 is always located near the upper end of the tank where the breathing tube 7 is connected to the lower tank 3, even if the number of restarts of the pump 1 increases. The water surface position required for pump operation does not change, and a certain amount of restart water can always be stored in the lower tank 3.

Furthermore, when the liquid pump 1Q is not operating, the liquid liquid pipe 5, upper tank 6, lower tank 3, and breathing pipe 7 are connected to the atmosphere as described above, so harmful substances such as methane gas generated in the underground wastewater tank are released. The gas is discharged to the outside through the above-mentioned atmospheric passage and does not accumulate in the lower tank 3, thereby preventing operational failures due to so-called air pockets.

Reference numeral 8 denotes a replenishment liquid pipe, which is connected to the pump 1 via a check valve or an on-off valve 9, and an opening 11 opened through a flow rate control valve 10 in the middle of the replenishment liquid pipe 8. A funnel-shaped receiver 12 facing the opening 11 is provided.

The tip of the liquid lift pipe 5 is connected to a drain pipe 19 and, via a branch pipe 20, to an air vent pipe 21 for preventing the occurrence of the siphon phenomenon.

13 is a gland for airtightness between the shaft 15 of the motor 14 and the pump 1; 16 is a drain valve; 17
is a vacuum gauge.

In use, the height of the suction port a is 1 in the lower tank 3.
When the pump 1 is started after confirming that the volumetric liquid (priming water) is stored, the liquid suctioned into the suction pipe 2 through the strainer 4 is sent to the lower tank 3.

At this time, the air that was in the suction pipe 2 enters the lower tank 3, but the liquid to the pump 1 is taken from the bottom of the lower tank 3, so the air does not reach the pump 1 and only the liquid flows into the pump 1. It is inhaled by 1.

The Q amount of liquid (priming water) in the lower tank 3 is at the height of the suction port a.
If the liquid is stored up to 100%, the suction port a is located above the discharge port d of the pump 1, and the inside of the pump 1 becomes full of liquid, and there is no fear of dry operation. do not have.

The liquid discharged from the pump 17) once fills the upper drum, passes through the liquid lift pipe 5, and is drained to the outside through the drain pipe 19.

In addition, when the liquid is discharged from pump 1, pump 1')
Since the lfl pressure acts on the check valve 9 of the replenishment liquid pipe 8 and the valve 9 is closed, there is no risk of water overflowing from the replenishment liquid pipe 8 communicating with the pump 1.

A portion of the iU in the upper tank 6 is returned to the lower tank 3 via the breathing tube 7.

In this way, the above liquid pumping state is maintained as long as the pump 1 continues to operate.

When the pump 1 is stopped, the load due to the falling pumped liquid water tries to act on the pump 1 etc., but the water hammer is absorbed in the upper tank 6 interposed in the liquid pumping pipe 5. This reduces the impact force acting on the pump 1, prevents damage to the gland pankin 13 that ensures airtightness between the motor shaft 15 and the pump 1, and prevents leakage of this partial force.

When the normal pump 1 is stopped, the liquid in the upper tank 6 flows back into the pump 1 and also flows into the lower tank 3 via the breathing pipe I, and the hot liquid in the lower tank 3 flows into the suction pipe 2.・As mentioned above, the siphon effect caused by the falling hot liquid is destroyed by the breathing tube I, and the suction port a of the lower tank 3 is connected to the discharge port d of the pump 1 as described above. Since the pump 1 is opened higher up and the inside of the pump 1 is always maintained full of liquid, there is no possibility of any trouble occurring when restarting the pump.

Furthermore, when the pump 1 is stopped during long-term use of the housing, a small amount of liquid may leak due to the aforementioned gland packing 13 housing or various causes, resulting in an abnormal drop in the liquid level in the lower tank 3. However, it is difficult to automatically compensate for such a leakage phenomenon due to the force that normally occurs drop by drop.

Therefore, in this embodiment, a replenishment liquid pipe 8 is connected to the pump 1,
A funnel-shaped receiver 12 is interposed in this replenishment liquid pipe 8 so that it can be easily monitored from the outside.

Therefore, while looking at the funnel-shaped receiver 12, the flow rate control valve 10 can be manually adjusted so that the amount of liquid to be supplied substantially matches the amount of liquid leaking from the gland packing 13, etc.

This makes it possible to easily compensate for the slow leakage phenomenon.

Embodiment 2 The embodiment shown in Fig. 2 is different from the embodiment shown in Fig. 1 because it relates to a liquid pumping device for pumping liquid (pumping water) from a water storage tank on the ground to a water storage tank on the roof of a building, etc. The point is lower tank 3
' and the upper tank 6' are installed separately, and a device is added that automatically warns of an abnormal drop in the liquid level in the lower tank 3' due to liquid leakage and at the same time automatically replenishes the liquid.

Therefore, if the structure is the same as that of the embodiment shown in FIG. 1, the same reference numerals will be used and the explanation will be omitted. When an abnormal drop in the liquid level in the lower tank 3' is detected by the action of the float sinch etc. 22, the liquid reduction alarm device 23 installed in the lower tank 3' is activated to detect the abnormal drop (case or malfunction). ), the solenoid valve 24 of the replenishment liquid pipe 8' connected to the upper tank 6' is energized to open the replenishment pipe 8', and the replenishment liquid pipe 8/7),
The liquid is supplied to the lower tank 3' via the upper tank 6' and the breathing pipe 7, and when the normal liquid level is reached, the alarm device 23 and the electromagnetic valve 24 are demagnetized dynamically.

Therefore, in this embodiment, the automatic operation device described above is provided in addition to manual operation using the manual valve 10.

Note that a check valve 25/l'i prevents the liquid in the liquid pumping pipe 5 from flowing back.

26 is the main valve, 27 (/i automatic air vent valve, 28
is a pressure gauge.

Therefore, according to the present invention, in the suction pipe side tank (lower tank) 3 interposed between the liquid pump 1 and the suction pipe 2, the suction port a of the suction pipe 2 to the tank 3 is connected to the liquid pump 1 and the suction pipe 2. Since the pump 1 is located above the suction port to the tank 1 and above the liquid level in the pump necessary for the pump 1 to operate, there is always no air inside the pump 1 that communicates with the tank. It is filled with water and does not cause any trouble when restarting, and is placed in the piping path of the liquid lift pipe 5 connected to the discharge port d of the liquid lift pump 1, which is located above the tank 3 on the suction pipe side. A liquid pump side tank (upper tank) 6 is installed so that the liquid pump 1
Since the water is returned to the suction pipe side tank 3 which is connected to this, the residual liquid level in the suction pipe side tank 3 which has dropped due to the initial activation of the pump is restored and replenished to the upper level, and the residual liquid level in the tank can be checked. etc., and can be used reliably and safely for a long time.

In particular, in the present invention, the vicinity of the bottom of the liquid pump side tank 6 and the vicinity of the upper end of the absorption tube side tank 3 are connected through the breathing tube 1, so that when the liquid pump 1 stops operating, the liquid lift pipe 5 The pumped liquid that falls and flows back through the upper tank 6 is returned to the lower tank 3.
At a position where the liquid level inside the tank is slightly lower than the upper end of the tank, the inside of the lower tank 3 becomes atmospheric pressure, which destroys the siphon effect that acts on the suction pipe 2 from the lower tank 371 during the reflux process, thereby preventing the pump 1 from restarting. Even if the number of activations increases, the liquid level necessary for pump operation in the lower tank 1 can be maintained at all times, and it can be used stably over a long period of time.

Furthermore, as mentioned above, the liquid pump 1 is always operated in a good manner by a force that prevents so-called air pockets from occurring in the suction pipe side tank 3 leading to the liquid pump 1 when the liquid pump 1σ is not in operation. You can reboot.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram showing a first embodiment of the liquid pumping device of the present invention, and FIG. 2 is a piping system diagram showing a second embodiment. 1... Lift pump, 2... Suction pipe, 3
...Suction pipe side tank, 5... Lifting pipe,
6... Lifting pipe side tank, 7... Breathing pipe, a... Suction pipe side tank 3 inlet, b...
... Suction port of the liquid pump 1, C... Delivery port of the suction pipe side tank 3, d... Discharge port of the curved liquid pump 1.

Claims (1)

[Scope of utility model registration request] A suction pipe side liquid storage tank 3 is enclosed in the suction pipe 20 piping line connected to the suction port q of the pump 1.
There is a liquid pump liquid storage tank 6 in the piping path of the liquid liquid liquid pipe 5 connected to
are respectively interposed, and the pumping liquid pipe side tank 6 is located above the suction pipe side tank 3 and the pumping pump 1,
In addition, the vicinity of the bottom of the liquid pumping pipe side tank 6 and the vicinity of the upper end of the suction pipe side tank 3 are connected to each other by a breather v1, and in the cased suction pipe side tank 3, the suction port a of the suction pipe 2 to the tank is connected. It is located above the suction port to the liquid pump 1 and above the liquid level in the pump necessary for the liquid pump 1 to operate, and is connected to the liquid pump 1 in the tank 3 on the suction pipe side. A liquid pumping device characterized in that a delivery port C of the tank 3 is located substantially near the bottom of the tank 3.