JPS60139304A - Suction pipe differential pressure valve apparatus in vacuum suction filter apparatus - Google Patents

Abstract

PURPOSE:To enhance suction filtering efficiency, by automatically closing the suction pipe of a storage tank connected to either one of filter tanks at the same time when the suction filtering of the liquid in said filter tank is finished. CONSTITUTION:A differential pressure valve 10 is provided on the way of the suction pipe 4 connected to a suction main pipe from a storage tank and a bypass suction pipe 12 with a manual cock 11 bypassing the differential pressure valve 10 is provided to said suction pipe 4. Every when the suction filtering of the liquid in each filter tank is finished, the suction pipe 4 of the storage tank connected to said filter tank is automatically closed. Whereupon, air sucked through the filter tank completed in the suction filtering of the liquid is blocked and the rising in the pressure of the vacuum system in the side of the suction main pipe is prevented. As a result, no trouble is imparted to the suction filtering of the liquid in the other filter tank at all and the liquid in each filter tank is perfectly sucked and filtered to enhance suction filtering efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suction pipe differential pressure valve device in a vacuum suction filtration device.

For example, when filtering a used gold potassium cyanide solution, as shown in FIG. A reduced pressure suction filtration device 7 is used, which consists of a vacuum pump 6 provided on a suction main pipe 5 that communicates with the vacuum pump 6. That is, a potassium gold cyanide solution 8 is put into the filter tank 1, and - the vacuum pump 6 is driven to suck the air in the storage tank 3 through the main suction pipe 5 and each suction pipe 4 to reduce the pressure in the storage tank 3. Then, the potassium gold cyanide solution 8 in the filter tank 1 is suction filtered and stored in the storage tank 3.

By the way, in the vacuum suction filtration device 7, the filtration tank 1 is monitored according to the expected time when filtration will be completed, and the suction is stopped by a timer and a solenoid valve 9 provided in each suction pipe 4, and the filtration is completed. However, the speed of filtration is hardly predictable, and the exact completion time of filtration cannot be predicted. Therefore,
In the step of performing vacuum suction filtration of the potassium gold cyanide solution 8, when the suction filtration of the potassium gold cyanide solution 8 in one of the filtration tanks 1 is completed first, a large amount of air flows through the filtration tank 1. flows into the storage tank 3 and further flows into the main suction pipe 5 through the connected suction pipe 4,
The pressure of the vacuum system is increased, and the potassium gold cyanide solution 8 in the other filtration tank 1 cannot be suction-filtered, and the potassium gold cyanide 8 remains in the filtration tank 1, causing the suction filtration. The efficiency is low, especially when a large number of filtration tanks 1 are arranged in parallel, the suction filtration efficiency becomes extremely low.

The present invention was made to solve this problem, and in a vacuum suction filtration device in which a plurality of filtration tanks are installed in parallel, when the suction filtration of liquid in any one filtration tank is completed, the filtration tank is It is an object of the present invention to provide a suction pipe differential pressure valve device in which a suction pipe of a storage tank connected to a storage tank is automatically closed.

Hereinafter, one embodiment of the suction pipe differential pressure valve device of the present invention will be described with reference to FIG. A differential pressure valve IO is provided, and a bypass suction pipe 12 with a manual condenser 11 that bypasses the differential pressure valve IO is provided.

The differential pressure valve 10 has one end screwed together with a strober pipe 13 which is fitted and connected to the cut end 4a of the three storage tanks of the suction pipe 4, and a cut end 4b of the suction pipe 4 on the suction main pipe 5 side at the other end. Connect the mating
a valve pipe 15 having a plurality of atmosphere opening holes 14 on the intermediate outer periphery;
A flange 1 is disposed within the valve pipe 15 at a certain distance, that is, the stopper pipe 13 and the cut ends of the suction main pipes of the suction pipe 4 are in contact with each other at a certain distance.
6, and a cylindrical valve body 17 slidably provided between the valve body 6 and the valve body 17. This cylindrical valve body 17 has a flange 18 on the outer periphery of one end on the side of the storage tank 3 that receives atmospheric pressure, and the tip on the side of the suction main pipe 5 has a blind 20 so as to close the vent 19 inside the flange 16.
One or more ventilation passages 21 are provided on the outer periphery of the blind 20.

The inner peripheral surface of the valve pipe 15 on which the cylindrical valve body 17 slides has the same diameter as the outer diameter of the flange 18 from the part of the atmosphere opening hole 14 to the reservoir 3 side, and the suction main pipe 5 up to the flange 16. The side has the same diameter as the outer diameter of the cylindrical valve body 17.

Next, the operation of the suction pipe differential pressure valve device configured as described above will be explained.

The vacuum pump 6 in FIG. 1 is driven, and the main suction pipe 5. The air in the storage tank 3 is sucked through each suction pipe 4 to reduce the pressure in the storage tank 3, and the gold potassium cyanide solution 8 in the filtration tank 1 is suction filtered and stored in the storage tank 3. Time is the second
The cut end 4a of the suction pipe 4 on the storage tank 3 side and the main suction pipe 5 in the figure
Since the interior of the cut end 4b of the side suction pipe 4 is in a reduced pressure state, atmospheric pressure (760 m
H'g) is applied to the flange 18 of the cylindrical valve body 17, the cylindrical valve body 17 moves toward the storage tank 3 side, and the cut end 4a side and the cut end 4b side of the suction pipe 4 are connected to the cylindrical valve body. It communicates through 17 ventilation passages 21.

When the filtration of the potassium gold cyanide solution 8 in each of the filtration tanks 1 is completed, the suction filtration of the potassium gold cyanide solution 8 in any of the filtration tanks 1 is completed, and a large amount of air is stored through the filtration tank 1. When the air flows into the cut end 4a side of the suction pipe 4 via the tank 3, its flow is obstructed by the ventilation path 21, and the air pressure P8 on the cut end 4a side increases.

Here, the force that prevents the cylindrical valve body 17 from moving toward the cut end 4a of the suction pipe 4 is the force S due to the atmospheric pressure applied to the flange 18 and the opening of the valve pipe 15 at the portion on which the cylindrical valve body 17 slides. This is the sum of the force SIE due to the pressure PE applied to the cross-sectional area, and conversely, the force that moves the cylindrical valve body 17 toward the cut end 4b of the suction pipe 4 is the force caused by the force of the valve pipe 15 in the portion on which the flange 18 slides. SA is determined by the pressure PA applied to the opening cross-sectional area. Therefore, this pressure P^
increases and SA becomes larger than S+3g, the cylindrical valve body 17 moves to the cut end 4b side of the suction pipe 4, and the air passage 21
is blocked by the flange 16, the vent hole 19 inside the flange 16 is blocked by the blind part 20 at the tip, the air flow is blocked, the pressure PA further increases, and the cylindrical valve body 17 is closed by the flange 16. The airflow stops completely.

In this way, the pressure in the vacuum system of the five main suction pipes does not increase, so that the potassium gold cyanide solution 8 in the other filtration tanks 1
There is no problem with suction filtration.

When the suction filtration of the gold potassium cyanide solution 8 in each filtration tank 1 is completed in this way, each suction pipe differential pressure valve device is automatically activated and the suction pipe 4 is closed. The potassium gold cyanide solution will be completely suction filtered. When resuming suction filtration by filling each filtration tank 1 with the used gold potassium cyanide solution 8, open the manual cock 11 of the bypass suction pipe 12, and connect the cut end 4a side of the suction pipe 4 with the manual cock 11 of the bypass suction pipe 12. It communicates with the cut end 4b side.

Then, the vacuum pump 6 is driven, and the suction main pipe 5. Suction tube 4.
The air in each storage tank 3 is sucked through the bypass suction pipe 12, and when the cut end 4a side and the cut end 4b of the suction pipe 4 are in a reduced pressure state, the manual cock 11 of the bypass suction pipe 12 is closed. Even when the manual cock 11 is closed, the cut end 4a side and the cut end 4b side of the suction pipe 4 maintain a reduced pressure state, so the cylindrical valve body 17 in the valve pipe 15 of the suction pipe differential pressure valve device is exposed to the atmosphere. The flange 18 receives atmospheric pressure from the open hole 14 and automatically moves toward the cut end 4a, opening the ventilation path 21 and communicating the cut end 4a and cut end 4b of the suction tube 4. , suction filtration of the gold potassium cyanide solution in each filtration tank 1 is performed.

Note that the material to be suction filtered in the filter tank 1 is not limited to the potassium gold cyanide solution.

As can be seen from the above description, according to the suction pipe differential pressure valve device according to the present invention, in a vacuum suction filtration device in which a plurality of filtration tanks are arranged in parallel, each time the suction filtration of liquid in each of the 11 filtration tanks is completed, Then, the suction pipe of the storage tank connected to the filtration tank is automatically closed, so the air sucked through the filtration tank that has finished suction filtration of the liquid is blocked, and the pressure in the decompression system on the main suction pipe side increases. Therefore, there is no problem in suction filtration of the liquid in other filtration tanks, and the liquid in each filtration tank is completely suction-filtered, resulting in an excellent effect that the suction filtration efficiency is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a reduced pressure suction filtration device, and FIG. 2 is a sectional view showing an embodiment of the suction pipe differential pressure valve device of the present invention. 1-----・filtration tank, 2---・-discharge port, 3----
-1 storage tank, 4-1-.-suction pipe, 4 a, 4 b--
--- One cut end, 5 --- Suction main pipe, 6.--1111 vacuum pump, 7 --- Reduced pressure suction filtration device, 8
------Gold potassium cyanide solution, 9-----Solenoid valve, 10-----1 differential pressure valve, 11-----1 manual cock, 12--Bypass suction pipe, 13- -----Stopper pipe, 14・---1-Atmosphere release hole, 15-・-
1--Valve pipe, 16-----・Flange, 17--, Cylindrical valve body, 1B-----Flange, 19-----1 Vent, 20--1・-Blind , 21 - - - Ventilation path.

Claims (1)

[Claims] It consists of a differential pressure valve provided in a suction pipe in a vacuum suction filtration device and an innomous suction pipe with a manual knob for bypassing the differential pressure valve, and the differential pressure valve has an atmosphere release hole provided in the middle of the suction pipe. a valve pipe, a flange portion which is slidably provided within the valve pipe by a certain amount and which receives atmospheric pressure through the atmospheric vent hole on the outer periphery side; One or more ventilation passages are provided around the peripheryζ
A suction pipe differential pressure valve device in a reduced pressure suction filtration device, characterized in that the suction pipe differential pressure valve device is constituted by a cylindrical valve body.