JPH03147623A - Pneumatic carrier - Google Patents

Abstract

PURPOSE:To eliminate needs of adding blowers and filters even if an air conveyor tube is prolonged by arranging a plurality of small diameter air conveyor tubes pro vided with stations at both ends along an air conveyor main tube, connecting them to the air conveyor main tube with a plurality of connecting tubes and by providing a suction mechanism at the upper stream side than the connecting part on the upper most stream side in the conveying direction. CONSTITUTION:Two small diameter air conveyor tubes 8 and 9 are arranged along a large diameter air conveyor main tube 1 provided with transmit-receive stations 2 and 3 at both ends, and transmit-receive stations 10 and 12, and 11 and 13 are pro vided at their both ends. The air conveyor main tube 1 is connected to the air conveyor tubes 8 and 9 with a plurality of connecting tubes 15 and 16, and each of the connecting tubes 15 and 16 is connected to a suction port 14 provided on the air con veyor tubes 8 and 9 with a predetermined interval through an opening/closing valve 20 from the air conveyor main tube 1. Also, filters 18 and 19 provided with an intake valve 17 are connected to the connecting tubes 15 and 16 closest to the transmit stations 10 and 11. Thus, small-sized carrier can be sent by opening and closing of the opening/closing valve one after another, conveying speed of the carrier can be adjusted, and filters are enough with the filters 18 and 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conveying device using a pneumatic carrier, and in particular,
This invention relates to a pneumatic conveyance device for pneumatically conveying a small amount of sample through a small pneumatic carrier in order to analyze samples such as radioactive contaminants that are dangerous to the human body at nuclear facilities and the like.

With this type of pneumatic conveying device, the pneumatic tube becomes contaminated while transporting the sample, so the used pneumatic tube and filters must be discarded, and the exhaust air from the suction blower must be disposed of. After passing through a filter, it is also required to exhaust it to the outside through an exhaust duct. For this reason, in consideration of the ease and safety of waste disposal or exhaust treatment of contaminated materials, the diameter of the pneumatic pipe is made as small as possible, and the pneumatic head is also made smaller, while the conveyance speed is reduced to 8.
It is necessary to set the speed to about 10 m/sec.

However, when long-distance conveyance is carried out using a single suction blower connected to the end of the pneumatic tube, the conveyance speed of the pneumatic tube gradually increases, and as it approaches the receiving station, it exceeds the above-mentioned safe speed. A situation may occur in which the pneumatic tube is destroyed by the centrifugal force of the air, or by the impact at the time of reception, and the contained sample leaks out. In order to prevent such a situation, conventionally, a configuration as shown in FIGS. 5 and 6 of the accompanying drawings has been adopted.

The pneumatic conveying device shown in FIG. 5 divides a pneumatic pipe 103 provided by connecting a transmitting station 101 that transmits a pneumatic carrier (not shown) and a glove box 102 that ultimately receives the pneumatic carrier. On the way, there is a relay station 104.
, 105 are provided. Inlet filters 106 and 107 are provided for each of the relay stations 104 and 105, and suction blowers 10B and 109 are installed near the relay stations 104 and 105 on the upstream side in the conveyance direction via exhaust filters 110 and 111, respectively. It is set up. Further, a suction blower 112 is provided near the glove box 102 via an exhaust filter 113. In order to prevent contamination, each of the suction blowers 10B, 109, 1
The exhaust gas from 12 is led to a ventilation duct (not shown), and after final treatment is released into the atmosphere.

In this conventional example, the pneumatic carrier is sequentially conveyed from the transmission station 101 to the corresponding relay stations 104, 105 by the respective suction blowers 10B, 109, and then conveyed to the glove box 102. Each time, it is stopped once and then transported again.

In the pneumatic conveying device shown in FIG. 6, a pneumatic pipe 123 is provided in the middle of a transmission station 121 that transmits a pneumatic carrier (not shown) and a glove box 122 that ultimately receives the pneumatic carrier. Suction boats 134 and 135 are installed in the branch pipe 12 equipped with on-off valves 124 and 125.
6 and 127 are connected to each other, and suction blowers 130 and 131 are provided to these branch pipes 126 and 127 via exhaust filters 128 and 129, respectively. Also, glove box 12
The suction blower 1 is also connected to the vicinity of the suction blower 1 via the exhaust filter 132.
There are 33. Here again, in order to prevent contamination, the exhaust air from each of the suction blowers 130, 131, 133 is led to a ventilation duct (not shown), and after final treatment is discharged into the atmosphere.

Furthermore, the pneumatic pipe 123 has a Sakushi town boat 134.1.
Photo sensors 136 and 137 for detecting the pneumatic carrier are arranged in front of the pneumatic carrier 35, that is, on the upstream side in the conveyance direction, and
An intake filter 139 is provided between the suction boat 134 and the station 121 via an intake valve 13B.

In this conventional example, first, the suction valve 138 is opened, the on-off valve 125 is closed, the on-off valve 124 is opened, and the suction blower 13 is opened.
Station 12 sends a pneumatic balloon by activating the
1 to the suction boat 134. When the photo sensor 136 detects the pneumatic carrier, after a predetermined time the on-off valve 124 is closed and the on-off valve 125 is opened, the suction blower 130 is stopped and the suction blower 131 is activated,
The pneumatizer is transported toward the suction boat 135. Subsequently, when the photo sensor 137 detects the pneumatic carrier, the on-off valve 125 is closed after a predetermined period of time, the suction blower 131 is stopped, the suction blower 133 is activated, and the pneumatic carrier is transported to the glove box 122. be.

In each of the above-mentioned conventional examples in which ``■'' occurs, when the conveyance distance becomes longer, that is, when the pneumatic pipes 103 and 123 become longer, the suction valves provided in the middle: I'710B, 109, 130° 131 are increased. Also, exhaust filters 110, 111
, 128, 129 must be added in the same way, which is not only uneconomical but also reduces the exhaust filter 11.
Since 0,111,128.129 is stained with lTi, it has to be disposed of, which has the disadvantage of increasing the amount of waste pollutants. In addition, relay stations 104, 10
5 and each of the suction blowers 10B, 109, 130, and 131 is not easy to maintain, and there are drawbacks to safety.

Furthermore, it has the disadvantage of being inferior in terms of energy saving.

An object of the present invention is to provide a pneumatic conveying device for use in nuclear facilities, etc., which eliminates such drawbacks.

1 n To achieve this object, the present invention provides a large-diameter pump, which is provided with stations at both ends for transmitting and receiving at least one of the pneumatic balloons, and suction blowers are respectively connected in the vicinity of these stations. A plurality of small diameter pneumatic pipes are arranged along the pneumatic main pipe and each end thereof is provided with a station for transmitting and receiving the pneumatic feeder. Each pneumatic pipe is connected to the pneumatic main pipe through a connecting pipe having an on-off valve, and a detector for detecting the pneumatic element is provided near these connecting parts on the upstream side in the conveying direction. , an intake mechanism is provided at least upstream of the connection portion located at the most upstream side in the conveyance direction.

Further, a large diameter pneumatic main tube is provided with stations at both ends for transmitting and receiving at least one of the pneumatic senders, suction blowers are connected to each of the stations near these stations, and branch pipes are provided at appropriate locations. A plurality of small diameter pneumatic pipes are disposed along this pneumatic main pipe and each end thereof is provided with a station for transmitting and receiving at least one of the pneumatic carriers, and each of the pneumatic pipes has an on-off valve. connected to the pneumatic main pipe via a connecting pipe, and a detector for detecting the pneumatic feeder is provided on the upstream side in the conveyance direction near these connecting parts;
Further, an intake m structure is provided at least upstream of the connection portion located at the most upstream side in the conveyance direction.

Furthermore, there is a large-diameter main pipe in which a branch pipe is provided and a suction blower is provided to circulate air, and stations arranged along this main pipe and at both ends perform at least one of sending and receiving the pneumatic sender. A plurality of small-diameter pneumatic pipes are provided with a plurality of pneumatic pipes, and each of the pneumatic pipes is connected to the main pipe through a connecting pipe having an on-off valve. , a detector for detecting the pneumatizer is provided,
Further, an intake mechanism is provided at least upstream of the connection portion located at the most upstream side in the conveyance direction.

By sequentially switching the opening/closing state of the 111 gourd on-off valve, air is circulated from the main pipe to a necessary part of the pneumatic pipe, and the pneumatic tube is conveyed. At this time, the suction pressure of the air in the pneumatic pipe can be adjusted by controlling the opening and closing of the on-off valve. Therefore, even if the pneumatic pipe becomes longer, there is no need to add an intake blower or exhaust filter, and multiple pneumatic pipes can be used at the same time. In this case, a large pneumatic carrier can also be pneumatically delivered using this pneumatic main tube.

Below, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings.
This will be explained in detail based on the figures.

First, a first embodiment will be described based on FIGS. 1 and 2.

As shown in FIG. 1, stations 2 and 3 for transmitting and receiving known large pneumatic feeders (not shown) are provided at both ends of the large-diameter pneumatic main tube l, respectively. Suction blowers 6.7 which draw negative pressure through intake pipes 4.5 and 4.5 are respectively connected near the intake pipes 4.5 and 4.5.

The exhaust side of each of the suction blowers 6.7 is connected to a ventilation duct (not shown), and is configured to be exhausted to the outside after final treatment.

Two small-diameter pneumatic pipes 8.9 are arranged along the pneumatic main pipe 1, and one end of each pneumatic pipe 8.9 contains samples dangerous to the human body, such as radioactive substances and waste liquid. A known transmitting station 10.11 is provided for transmitting a known small pneumatic carrier (not shown) containing a pneumatic carrier, and at the other end of each pneumatic tube 8. A known receiving station 12.13 is provided for receiving. That is, although reciprocating transport through each of the pneumatic tubes 8.9 is also possible, this embodiment is configured to perform transport in only one direction (the direction of the arrow in FIG. 1). In a nuclear power facility, each transmitting station 10, 11 is generally located in a storage facility for plutonium, uranium, etc., and each receiving stage 12, 13 is generally located in a central analysis room.

Although not shown in FIG. 1, as can be understood from FIG. A connecting pipe 15 equipped with an on-off valve 20 provided corresponding to 4.
．． Each of the pneumatic tubes 8.9 is connected to the pneumatic main tube 1 by means of 16.

In addition, each transmitting station 1 of each pneumatic pipe 8.9
An intake filter 1819 equipped with an intake valve 17 serving as an intake mechanism is connected to each of the transmission stations 10.11 (!l!l) of the connection pipe 15.16 closest to 0.11. In the vicinity of each suction boat 14 in the pneumatic pipe 8.9, a photo sensor 2I, which is a detector located on the upstream side in the conveyance direction and detects the pneumatic feeder, is provided.

Since the present embodiment is constructed as described above, if each on-off valve 20 is closed and the pneumatic main pipe 1 and each pneumatic pipe 8.9 are placed in a non-communicating state, each suction can be operated in the same manner as before. By controlling the operation of the blower 6.7, the large pneumatic carrier can be transported back and forth between each station 2.3 using the pneumatic main pipe 1.

In addition, each transmitting station 1 using each pneumatic tube 8.9
In order to transport the small pneumatic carrier from 0 and 11 to each receiving station 12 and 13, first open the suction valve 17, and at the same time open the inlet valve 17.
By opening the on-off valve 20 of the connecting pipe 15.16 on the 0.11 side and controlling the operation of each suction proar 5.6, the pneumatic carrier is transported from the sending station 10.11 toward the first suction boat 14. . When the photo sensor 21 detects the pneumatic feeder, the on-off valve 20 that was in the open state is closed after a predetermined period of time, and the pneumatic feeder is removed from the next stage, that is, from the transmitting station run 10 and 11 side.
The on-off valve 20 of the second connecting pipe 15 and 16 is opened, and the pneumatic carrier is transported toward the second suction boat L4. Then, when the photosensor 2I provided in front of the second saccillum boat 14 detects the pneumatic carrier as described above, the on-off valve 20 that was in the open state is closed after a predetermined period of time, and the on-off valve 20 of the next stage is closed.
is opened, and the pneumatic carrier is transported toward the third saxiram boat 14. In this way, the on-off valves 20 near the photosensor 2I that detected the pneumatic carrier are sequentially opened, and the on-off valves 20 at the positions where the pneumatic carrier has passed are sequentially closed, thereby transporting the pneumatic carrier to each receiving station 12.13. do. The pneumatic carriers can be transported separately for each of the pneumatic tubes 8 and 9, or simultaneously. and,
When the on-off valve 20 on the upstream side in the conveyance direction is opened, the suction pressure within the pneumatic tube 8.9 is reduced, so that the conveyance speed of the pneumatic feeder can be adjusted. Further, this conveyance speed of 11 Jlfl can also be achieved by adjusting the opening/closing amount of the on-off valve 20.

Next, a second embodiment will be described based on FIG.

The difference between this embodiment and the first embodiment described above is that the first embodiment
While a branch pipe 30 is provided in the pneumatic main pipe I of the embodiment, three pneumatic pipes 31 and 3 are provided along the pneumatic main pipe 1 and the branch pipe 30.
2.33, and since the other configurations and functions are the same, corresponding components will only be given the same numbers and their explanation will be omitted. In addition, in Figure 3, 34,
35.36 is the transmitting station, 37.38.39 is the receiving station, 40, 41.42 is the intake filter, 4
Reference numerals 3, 44, and 45 denote connection pipes, which are constructed in the same manner as in the first embodiment described above.

This embodiment has the advantage that the provision of the branch pipe 30 increases the degree of freedom in piping design of the pneumatic pipes 31, 32, and 33.

Next, a third embodiment will be described based on FIG. 4.

This embodiment differs from each of the above-mentioned embodiments in that the main pipe 50
However, it does not have a station and only has the function of supplying air into the pneumatic tubes 51, 52, 53, and does not have the function of transporting the pneumatic tube. Since the other configurations and operations are the same as those in each of the embodiments described above, corresponding components will only be given the same numbers and their explanations will be omitted.

In this embodiment, a branch pipe 54 is provided;
The advantage of providing the 0 branch pipe 54, which is not necessarily required, is the same as in the second embodiment.

In addition, pneumatic tubes 8, 9, 31, 32, 33.51°52.
It goes without saying that the number of 53 pieces can be increased or decreased, and
The detector of the pneumatic carrier is not limited to the photosensor 21.

As is clear from the above explanation, according to the present invention, even if the pneumatic pipe becomes long, there is no need to add a suction blower or an exhaust filter, so the amount of exhaust gas is small and safety is excellent. Since the equipment can be simply configured, maintenance and inspection are easy, it is also economical, and it has many effects such as reducing the amount of contaminated waste such as filters, and contributing to energy conservation. play.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing the first embodiment of the present invention, FIG. 2 is an explanatory diagram showing the connecting pipe portion in detail, and FIG. FIG. 4 is an overall schematic diagram showing a third embodiment of the present invention, and FIGS. 5 and 6 are overall schematic diagrams showing a conventional example.

Claims (3)

[Claims] (1) A large-diameter pneumatic main tube with stations installed at both ends for transmitting and receiving at least one of the pneumatic senders, suction blowers connected to each station near these stations, and a large-diameter pneumatic main pipe arranged along the pneumatic main pipe. and a plurality of small diameter pneumatic tubes each having a station at both ends for transmitting and receiving at least one of the pneumatic carriers, each of the pneumatic tubes being connected to the pneumatic carrier through a connecting tube having an on-off valve. A detector is connected to the pipe, and a detector for detecting the pneumatic feeder is provided on the upstream side in the conveyance direction in the vicinity of these connection parts, and at least on the upstream side of the connection part located on the most upstream side in the conveyance direction. An air conveying device characterized by being provided with an intake mechanism. (2) Stations are provided at both ends for transmitting and receiving at least one of the pneumatic senders, suction blowers are connected to each other near these stations, and a large-diameter pneumatic main pipe with branch pipes provided at appropriate locations is installed. , a plurality of small diameter pneumatic pipes arranged along the pneumatic main pipe and each end of which is provided with a station for transmitting and receiving at least one of the pneumatic carriers, each of the pneumatic pipes having an on-off valve. connected to the pneumatic main pipe through a connecting pipe having a pneumatic feeder, and a detector for detecting the pneumatic feeder is provided on the upstream side in the conveyance direction near these connecting parts,
Furthermore, an air conveyance device characterized in that an air intake mechanism is provided at least upstream of the connection portion located at the most upstream side in the conveyance direction. (3) A large-diameter main pipe provided with branch pipes and a suction blower through which air flows, and stations arranged along this main pipe and at both ends that perform at least one of sending and receiving pneumatic probes. A plurality of small-diameter pneumatic pipes are provided with a plurality of pneumatic pipes, and each of the pneumatic pipes is connected to the main pipe through a connecting pipe having an on-off valve. 1. An air conveyance device, characterized in that a detector for detecting an air feeder is provided, and an air intake mechanism is provided at least upstream of a connection portion located at the most upstream side in the conveyance direction.