JPH0454971Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pressurized tank for a pneumatic transport device, and in particular, it is a method for continuously pneumatically transporting powder and granular materials by stacking pressure tanks in two layers (upper and lower). The present invention relates to a pressurized tank for a pneumatic transportation device suitable for use in a pressurized tank.

[Prior Art] There are various pneumatic transport devices that pressurize a tank containing powder with compressed air and forcefully transport the powder. However, in order to continuously receive and transport powder and granules, it is necessary to stack pressurized tanks in two layers, upper and lower, so that even if the upper pressurized tank is receiving powder and granules, the lower pressurized tank can continue transporting the particles. be.

In low-speed, high-concentration pneumatic transportation devices, the air pressure used is two to three times higher than in general pressure-feeding pneumatic transportation devices. Therefore, when the powder in the upper pressurized tank is supplied to the lower pressurized tank, air blows up toward the upper pressurized tank because the pressure in the lower pressurized tank is high. Similarly, when receiving powder from the hopper into the upper pressurized tank, air blows up into the hopper due to the high pressure in the upper pressurized tank. Therefore, due to this phenomenon of air blowing up, it may not be possible to smoothly supply or receive the powder or granular material.

Therefore, a connection port separate from the powder supply and reception port is provided in the upper pressurized tank and the lower pressurized tank, and a pressure equalization piping is used to connect these two connection ports. When supplying powder into the pressure tank, the pressure equalization valve is opened to maintain the same pressure in the upper and lower pressure tanks. Further, the upper pressurized tank is provided with an exhaust pipe, and when receiving powder from the hopper into the upper pressurized tank, the exhaust valve is opened to bring the inside of the upper pressurized tank to atmospheric pressure. However, especially when using the exhaust piping to bring the inside of the upper pressurized tank to atmospheric pressure, the air containing powder inside the upper pressurized tank may clog the valve seat of the exhaust valve as it passes through the exhaust valve. This caused malfunctions and hindered stable, long-term continuous operation. In addition, when the upper pressurized tank filled with powder and granules is brought to the same pressure as the lower pressurized tank again, air blows up from the lower pressurized tank toward the exhaust valve via the pressure equalization piping, causing the air to be removed. There was also a risk that the powder and granules could clog the exhaust valve. Therefore, although a filter may be installed just before the exhaust valve, it is extremely difficult to collect the powder and requires frequent maintenance, which is complicated.

[Problem that the invention attempts to solve]

The present invention eliminates the drawbacks of the prior art and provides a pressurized tank for a pneumatic transport device that prevents powder from clogging an exhaust valve provided in the middle of an exhaust pipe.

[Means for solving problems]

The pressurized tank for a pneumatic transportation device according to the present invention has two stacked pressurized tanks each having a reception valve at the upper part of the powder receiving port, and includes pressure equalization piping that connects the upper and lower pressurized tanks. A pressure equalizing valve installed in the middle of the pressure equalizing pipe, an exhaust pipe branching from the middle of the pressure equalizing pipe between the pressure equalizing valve and the upper pressurizing tank connection port and having an exhaust valve, and an equalizing valve installed between the pressure equalizing valve and the upper pressurizing tank connecting port. A pressurizer for a pneumatic transport device comprising an exhaust pipe branching from the middle of the pressure pipe and having an exhaust valve, and the air supply pipe having an air supply valve connected to the pressure equalizing pipe midway between the pressure equalizing valve and the lower pressurizing tank connection port. In the pressure tank, filters are provided at both connection ports of the pressure equalization piping to the upper and lower pressure tanks, and the inner surface of the casing on the tank side below the filter element is an inverted conical hopper. It is characterized by being able to be recovered into the tank by falling under its own weight.

[Effect]

According to the above configuration, a filter is provided at each connection port of the pressure equalization piping that connects the upper and lower pressurized tanks, so when the upper pressurized tank is depressurized in order to replenish the powder and granules, the powder and granules are removed. is captured by the filter to prevent it from entering the exhaust pipe. In addition, after refilling, the pressure equalization valve is opened for repressurization and air is supplied from the air supply piping to equalize the internal pressure of both tanks, but until the pressure difference between the lower pressurized tank and the upper pressurized tank disappears. During this time, pressurized air may flow back into the upper pressurized tank through the pressure equalization piping.
However, since a filter is provided at the connection port between the pressure equalization pipe and the lower pressure tank, backflow of powder and granules is effectively prevented. Each filter installed at the connection port of the pressure equalizing pipe to the upper and lower pressurized tanks has an inverted conical hopper in its casing below the filter element, so the powder and granules blocked by the element are transported inside each tank by their own weight. This means that the powder and granules can be transported automatically without being lost to other locations. In particular, in combination with the filter backwashing function by supplying re-pressurized air, there is no residual powder on the filter, and therefore maintenance is easy.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. The configuration of the pneumatic transport device according to this embodiment is that there is a supply hopper 13 for the powder and granular material 10 at the top, and a primary receiving valve 14 at the lower part of the supply hopper for the powder and granular material 10.
There is an upper pressurized tank 12 that receives 0, and a lower pressurized tank 11 that has a secondary receiving valve 15 below the tank 12 and pumps the powder 10. The lower part of the lower pressurized tank 11 is connected to a transport pipe 22 and the granular material 10 is transported to a storage tank 23. The pressure equalization pipe 28 communicates between the connection port 31 of the upper pressure tank 12 and the connection port 30 of the lower pressure tank 11, and has a pressure equalization valve 18 in the middle. The exhaust pipe 29 branches from the middle of the pressure equalizing pipe 28 and has an exhaust valve 19 in the middle. The air supply pipe 27 generates compressed air by a compressor 24, and is connected to an air receiver 25 and an air filter 2.
6, to the transport pipe 22 at the bottom of the lower pressurized tank 11 via the booster valve 17, and to the air supply valve 16.
The pressure equalizing pipes 28 are connected to each other midway through the pressure equalizing pipes 28.

The filter 20, which is the key point of the present invention, is the connection port 3 of the pressure equalization pipe 28 of the upper pressurized tank 12.
It is attached to 1.

The operating procedure of this device with the above configuration will be explained next.

The granular material 10 is in the supply hopper 13,
First, when the primary receiving valve 14 is opened, the upper pressurized tank 1
Powder 10 enters the chamber 2, and when it is full, the primary receiving valve 14 is closed. At this time, the secondary receiving valve 15 is closed. At this stage, the pressure inside the upper pressurized tank 12 is atmospheric pressure. If the secondary intake valve 15 is opened in this state, a blow-up phenomenon will occur due to the air pressure in the lower pressure tank 11, so open the pressure equalization valve 18 to pressurize the compressed air in the air supply pipe 27 to the upper part. It is made to flow into the tank 12 to make it have the same pressure as the inside of the lower pressurized tank 11. When the secondary receiving valve 15 is opened in this state, the powder 10 in the upper pressurized tank 12 falls into the lower pressurized tank 11 without blowing up. At this time, the compressed air in the air supply pipe 27 is supplied to the lower pressure tank 11 and the transport pipe 22 because the air supply valve 16 and the booster valve 17 are always open, and the powder and granules in the lower pressure tank 11 are 10 is pushed into the transport pipe 22 and pneumatically transported to the storage tank 23. When the upper pressurized tank 12 is empty, the secondary intake valve 15 and pressure equalization valve 18 are closed, and the exhaust valve 19 is opened. Then, the air in the upper pressurized tank 12, which had maintained the same pressure as that in the lower pressurized tank 11, is removed from the exhaust pipe 29.
It is then released into the atmosphere. As a result, the pressure inside the upper pressurized tank 12 becomes atmospheric pressure, and the primary receiving valve 14 is opened again, allowing the powder and granular material 10 to fall into the upper pressurized tank 12 from the supply hopper 13 without being blown up. .

By repeating the above operating procedure, the powder and granular material 10 can be continuously received and transported.

During the above exhaust operation, the particulate matter 10 in the upper pressurized tank 12 enters the exhaust pipe 29 along with the air flow and clogs the valve seat of the exhaust valve 19, causing malfunction of opening and closing of the exhaust valve 19. A filter 20 is attached to the connection port 31 of the pressure equalization pipe 28 of the upper pressurized tank 12. As a result, the powder 10 is captured by the filter 20 and does not flow into the exhaust valve 19.

The powder 10 captured by the filter 20 is backwashed because the air flow a during the pressure equalization operation is in the opposite direction to the air flow b during the exhaust operation, and the overefficiency of the filter 20 does not decrease.

As explained above, according to this embodiment, the filter 20 is provided at the connection port 31 of the pressure equalizing pipe 28 of the upper pressurized tank 12, so that the powder and granular material 10 in the upper pressurized tank 12 is air-filled by the exhaust valve 19. The powder particles 10 do not enter along with the flow, and as a result, the valve seat of the exhaust valve 19 and the like are prevented from being clogged with the powder particles 10.

Accordingly, long-term continuous operation of the pneumatic transport device can be stabilized.

In this embodiment, since it is conceivable that the air flow during the pressure equalization operation will be as shown by the arrow c shown in FIG. There is. This filter 21 is also backwashed by the air flow d from the air supply pipe 27 during transportation.

Figure 2 is a cross-sectional view of the filter according to the present invention.
The filter element 38 has an upper cylindrical cover 35 and a lower inverted conical hopper-shaped casing 36.
It is sealed and inserted through an O-ring 37. The cover 35 and the casing 36 can be fixed with a tightening band (not shown). Air containing the granular material 10 flows as shown by arrow e. Therefore, the captured powder 10 adheres to the lower part of the filter element 38. The adhered powder 10 is backwashed by the equal pressure air flow f. In the filter according to this embodiment, by making the casing 36 into an inverted conical hopper shape, the overarea of the filter element 30 can be increased, and the backwashed powder 10 can be prevented from accumulating along the inner wall 39 of the casing 36, and the upper part can be removed. It can be dropped into the pressure tank 12 and the filter effect can be enhanced.

[Effect of idea]

According to the present invention, filters are provided at both connection ports of the pressure equalizing pipe to the upper and lower pressurized tanks, and the inner surface of the casing on the tank side below the filter element is an inverted conical hopper, and the powder particles The structure allows collection into the tank by falling under the body's own weight, which effectively prevents powder and granules from flowing out due to air blowing up between the upper and lower pressurized tanks and from the upper pressurized tank through pressure equalization piping. This eliminates clogging of the exhaust valve due to dust, and the powder and granules blocked by each filter can be automatically collected into the pressurized tank, improving collection efficiency and maintenance workability. At the same time, the operation of the exhaust valve becomes smoother, and backwashing is also performed when the pressure in the upper and lower pressurized tanks is equalized, thereby stabilizing the long-term continuous operation of the pneumatic transportation device.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a sectional view of a filter according to the present invention. 10... Powder, 11... Lower pressurized tank, 1
2... Upper pressurized tank, 14... Primary receiving valve, 1
5... Secondary intake valve, 16... Air supply valve, 17... Boosting valve, 18... Pressure equalization valve, 19... Exhaust valve, 20...
...filter, 22...transport pipe, 24...compressor, 27...air supply piping, 28...equalizing pressure piping, 29...exhaust piping, a...equalizing air flow, b...
...exhaust air flow.

Claims (1)

[Scope of utility model registration request] Pressurized tanks with receiving valves installed at the upper powder/granular material receiving ports are stacked in upper and lower layers, and pressure equalizing piping connects the upper and lower pressurizing tanks, a pressure equalizing valve installed in the middle of the pressure equalizing piping, and a pressure equalizing valve. Exhaust piping with an exhaust valve that branches off from the middle of the pressure equalization piping between the pressure equalization valve and the upper pressurized tank connection port; and Exhaust piping that has an exhaust valve that branches off from the middle of the pressure equalization piping between the pressure equalization valve and the upper pressure tank connection port. and a pressurized tank for a pneumatic transport device comprising the air supply pipe having an air supply valve connected in the middle of the pressure equalization pipe between the pressure equalization valve and the lower pressure tank connection port, wherein Filters are installed at both connection ports of the pressure equalization piping, and the inner surface of the casing on the tank side below the filter element is an inverted conical hopper, making it possible to collect powder and granules into the tank by falling under their own weight. A pressurized tank for pneumatic transportation equipment, characterized by: