JPH0672475A - Liquid feeding container equipped with pump - Google Patents

Abstract

PURPOSE:To provide a liquid feeding container which can feed an appropriate quantity of a liquid in a tank in response to the quantity of the liquid in the tank, which is consumed. CONSTITUTION:When a piston 25 is pushed up, a liquid from a container main body is fed to a cylinder lower space part 26, and a liquid which is stored in a cylinder upper space part 36 is discharged in a tank. When the piston 25 is pushed down, the liquid which is stored in the cylinder lower space part 26 is discharged in the tank, and the liquid from the container main body is fed to the cylinder upper space part 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply container with a pump for supplying new liquid so that the amount of liquid in a liquid tank becomes constant.

[0002]

2. Description of the Related Art (1) When a liquid tank is set in an electronic copying machine, it is discharged by its own weight as means for keeping constant the liquid that is temporarily consumed in a liquid tank by supplying a new liquid, (2) It is known that a container is preliminarily pressurized and discharged.

However, the conventional liquid supply device has various problems. For example, in the device (1), it is difficult to control the supply of new liquid so that the liquid in the container becomes a constant amount. Further, the device (2) requires a device for performing constant pressurization.

Therefore, the applicant of the present application has previously proposed a liquid developer supply container with a pump capable of reliably supplying a constant amount of liquid developer into the developing tank for each operation without using a pressurizing means. (Japanese Patent Application No. 3-26080). However, when the internal pressure in the supply container becomes high, the liquid developer sometimes leaks from the discharge port or the air replacement port. That is, in the liquid developer supply container with the pump shown in FIG. 5, when the internal pressure becomes high due to the temperature rise in the container filled with the liquid developer, the liquid developer is discharged from the suction port A27 and the suction port B27 '. When the liquid developer supply container is set in the electrophotographic copying machine and used, the liquid developer sometimes causes an air displacement pipe when the internal pressure of the supply container is high. There was a case where it leaked through the air replacement port 41 through the 20.

[0005]

The object of the present invention is not limited to liquid developers, but can be applied to general liquids, so that an appropriate amount of liquid can be ensured for each operation without using a pressurizing means. It is intended to provide a liquid supply container with a pump which can be supplied into a tank and in which the above-mentioned leakage does not occur.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a container body,
A liquid supply container with a pump including a cylinder provided in the container body, a spring provided in the cylinder, and a piston provided with a piston cover and a piston shaft that are pushed downward in the cylinder by the spring. In the lower part of the cylinder, a cylinder valve for sucking the liquid into the lower space of the cylinder from the suction port A when the piston is pushed up is provided, and the piston is provided in the upper space of the cylinder when the piston is pushed down. A piston valve A for sucking the liquid from a suction port B, a piston valve B for discharging the liquid in the cylinder lower space through the piston shaft, and a liquid in the cylinder upper space when the piston is pushed up the piston shaft A piston valve C for discharging through the inside is provided, and -Providing a valve retainer for pressing the valve from the inside, and further providing a pedestal provided with seal packing at the connecting portion between the tip of the suction port B and the cylinder or the container body when the piston is pushed down most. It is characterized by that.

The present invention will now be described in more detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a pump unit according to a liquid supply container with a pump of the present invention, in which 20 is an air replacement pipe communicating with an upper part (bottom part) in an inverted liquid supply container, 21 is a cylinder cover, 22 is a cylinder, and 23.
Is a piston valve A provided on the piston cover, 24 is a piston cover, 25 is a piston, 26 is a space below the cylinder, 27 and 27 'are suction ports A and B for sucking liquid from a liquid supply container, and 28 is a liquid tank. A discharge port for discharging the liquid, 29 and 30 are sealing materials, 32 is a cylinder valve,
33 is a piston valve B that discharges liquid from the cylinder lower space 26 to the discharge port 28 when the piston moves downward, 36 is a cylinder upper space, and 34 is liquid from the cylinder upper space 36 when the piston moves upward. Valves C, 35 for sucking in and discharging it to the liquid outlet 28
Is a spring for urging the piston downward, 40 is a piston shaft having a passage for discharging liquid therein, 4
Reference numeral 1 is an air replacement port, 42 is a valve retainer for pressing the cylinder valve 632 from the inside, 43 is a pedestal to which a seal packing 44 is attached and fixed to the cylinder 22 (or container body), and 45 is a backflow prevention seal. Is.

2, FIG. 3 and FIG. 4 are overall views showing the disposition relationship between the liquid supply container body, the pump and the liquid tank according to the present invention, and how an appropriate amount of liquid is supplied to the liquid tank. FIG.

As can be seen from FIG. 2, the pump portion is fixedly arranged in the container body 1, and the liquid discharge port of this pump portion is opened to the liquid tank 50. Further, the inside of the container body 1 is filled with a liquid. Now, as shown in FIG. 2, when the liquid in the tank 50 is consumed and the liquid level is lowered to a level below a preset lower limit level, a liquid level detecting means (not shown) The signal causes the solenoid 51 to operate for a certain period of time, and the piston shaft 40 is pushed up in the operating direction B in conjunction with it. as a result,
The cylinder valve 32 opens, and a certain amount of liquid is sucked into the cylinder lower space portion 26 through the suction port A (suction port 27).
At the same time, the piston valve C34 is opened, liquid is sucked from the cylinder upper space portion 36, and the discharge port 2 is connected to the liquid tank 50 from the discharge port 28 through the passage inside the piston shuff
Drain the liquid to 8. When the tank 50 is filled with an appropriate amount of liquid, the pushing up of the piston shaft 40 ends.

When the amount of the liquid in the tank 50 starts to decrease again and becomes lower than the lower limit level, the piston 25 is pushed down in the operating direction A by the spring 35. At this time, the piston valve A is opened and a certain amount of liquid is sucked into the suction port B (suction port 2
7 ') and suction into the upper space 36 of the cylinder. At the same time, the piston valve B33 is opened to suck the liquid from the cylinder lower space portion 26 and discharge the liquid from the piston shaft internal passage to the discharge port 28 (FIGS. 3 and 4). FIG. 4 shows an example in which the lower limit level of the liquid in the tank 50 is set lower than that in FIG.

As the liquid is discharged from the supply container to the tank 50, the air in the tank is guided to the bottom of the supply container (the upper part of the supply container by the air replacement port 41 and the air replacement pipe 20).

As described above, since both of the piston operating directions A and B have the function of simultaneously sucking and discharging the liquid, a double operation of the liquid in the tank 50 is performed by one operation of the solenoid. Can be supplied.

Next, to prevent leakage of the liquid from the liquid supply container, as shown in FIG. 1, when the pump is stopped, that is, while the liquid in the tank 50 is within the allowable range,
Since the cylinder valve 32 is pressed from the inside by the valve presser 42, liquid does not enter the pump through the suction port A27 even if the internal pressure of the container increases. On the other hand, suction port B
The tip of 27 ′ is a seal packing 44 provided on the pedestal 43.
Since it is blocked by, the liquid cannot enter the pump from here. If necessary, if the backflow prevention seal 45 is provided so as to be in close contact with the inner surface of the cylinder cover 21 (FIG. 1), liquid will not enter the air replacement pipe 20.

[0014]

According to the present invention, an appropriate amount of liquid can always be reliably supplied into the tank with each operation by a simple device without providing a pressurizing means, and further, in a container during storage and transportation. The liquid does not leak even if the internal pressure of the tank rises.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a pump section showing an embodiment of a liquid supply container of the present invention.

FIG. 2 is an explanatory diagram showing how an appropriate amount of liquid is supplied from the liquid supply container body of the present invention to the tank.

FIG. 3 is an explanatory diagram showing how an appropriate amount of liquid is supplied from the liquid supply container body of the present invention to the tank.

FIG. 4 is an explanatory diagram showing how an appropriate amount of liquid is supplied from the liquid supply container body of the present invention to the tank.

FIG. 5 is a cross-sectional explanatory view of a comparative pump part.

[Explanation of symbols]

 1 Container Main Body 20 Air Displacement Pipe 21 Cylinder Cover 22 Cylinder 23 Piston Valve A 24 Piston Cover 25 Piston 26 Lower Cylinder Space 27 Suction Port A 27'Suction Port B 28 Discharge Port for Discharging Liquid Developer 32 Cylinder Valve 33 Piston valve B 34 Piston valve C 35 Spring 36 Cylinder upper space 40 Piston shaft 41 Air displacement port 42 Valve retainer 43 Cradle 44 Seal packing 45 Backflow prevention seal 50 Liquid tank 51 Solenoid

Claims (1)

[Claims] 1. A container body (1), a cylinder (22) provided in the container body (1), and a cylinder (22).
A spring (35) provided inside and a spring (3
5) The piston cover (24) and the piston shaft (4) are pushed downward in the cylinder (22) by the 5).
0) with a piston (25), a cylinder (22) has a piston (2
5) A cylinder valve (32) for sucking liquid from the suction port A (27) into the lower space (26) of the cylinder is provided when the piston 5 is pushed up, and the piston (25) is a cylinder when it is pushed down. The piston valve A for sucking the liquid into the upper space portion (36) through the suction port B, the piston valve B for discharging the liquid in the lower cylinder space portion (26) through the piston shaft (40), and the piston (25) are pushed. Piston valve C for discharging the liquid in the cylinder upper space (36) through the piston shaft (40) when raised
The piston (25) is provided with a valve retainer (42) for pressing the cylinder valve (32) from the inside. Further, when the piston (25) is most depressed, the tip of the suction port B and the container body (1) are provided. ) Or a liquid supply container with a pump, characterized in that a seal packing (44) is attached to a connecting portion with a pedestal (43) connected and fixed to the cylinder (22).