JPS6344093Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dust separation device in a dust collection system.

(Prior art) In general, dust filtration and dust separation and collection in a dust collection system are performed using a flow path for causing a gas containing dust to flow in a predetermined direction, a filtration element interposed in the flow path, and a filtration element. It mainly consists of a clean gas discharge path after passing through, and a dust separation means that blows off dust adhering to the filter element by causing compressed air to flow back into the filter element.

The compressed air backflow method includes a low-pressure backwash method in which low-pressure air is sent at a low speed to brush off dust attached to the filter element, and a pulse jet method in which high-pressure jet is sent instantaneously to violently vibrate the filter element to remove it. There is.

As examples of the low-pressure backwashing method, those described in Japanese Utility Model Publication No. 3095/1983 and Japanese Utility Model Application Publication No. 37469/1988 are known.

In the device described in the above-mentioned Japanese Utility Model Publication No. 51-3095, the dust-containing gas flow path is a divided path, the clean gas discharge path is also a divided path, and a switch is installed at the connection between each discharge divided path and the discharge pipe. Furthermore, a backwashing air supply port is provided in each discharge divided passage, and this supply port is also provided with an on-off valve. The flow path is configured such that the dust-containing gas flows from above to below. Further, the opening/closing device for the discharge branch passage and the opening/closing valve for the supply port are configured to be sequentially opened and closed by a crank that is interlocked by a single shaft.

According to the dust separator having the above configuration, the opening/closing device of one discharge division passage is closed, the opening/closing valve of the backwash air supply port of the division passage is opened, and backwash air is supplied to the discharge division passage, Brush off the dust adhering to the filter element by backflowing the filter element. The large pieces of dust that are brushed off fall, but the fine particles flow upward together with the backwashing gas, enter another flow dividing path, and flow downward.

In addition, in the device described in the above-mentioned Japanese Utility Model Application Publication No. 48-37469, the flow path is single, the discharge path is a divided path, and each divided path is provided with an opening/closing device and an opening/closing valve as described above. The structure is such that the dust-containing gas flows from the bottom to the top in the flow path.

In this device as well, the opening/closing device of one discharge split passage is closed, the opening/closing valve of the backwashing air supply port is opened, and the backwashing air passes through the filter element to blow off the attached dust. The heavier part of the dust that is brushed off falls, but the lighter part stays in the vicinity due to the flow of the flow path (from the bottom to the top).

On the other hand, as for the pulse jet method,
Those described in Japanese Utility Model Publication No. 38-10289 and Japanese Utility Model Application Publication No. 54-74381 are known.

What is described in the above-mentioned Utility Model Publication No. 38-10289 is
Both the flow path and the discharge path are configured as a single unit, and the dust-containing gas is configured to flow from the bottom to the top. An injection pipe is provided in the discharge passage corresponding to each filter element, and each injection pipe sequentially blows jet into the filter element. and,
This instantaneous jet of jet causes the filtration element to vibrate and dislodge dust. This injection of the jet is carried out during the filtering action of the filter element, and the lighter dust particles are prevented from falling by the flow in the flow path.

In addition, the one described in Utility Model Application Publication No. 57-74381 is
The flow path is single, the discharge path is a divided path, each divided path is provided with an opening/closing device, and each divided path is provided with an injection pipe. Also in this device, the dust-containing gas in the flow path is configured to flow from the bottom to the top. Therefore, among the dust particles that were blown away by the vibrations of the jet stream, light particles were less likely to fall.

(Problems to be Solved by the Invention) Since the low-pressure backwash method described above sends low-pressure air back, there is a problem in that it takes a long time to remove dust. Furthermore, even if a pulsating flow is supplied as backwash air to vibrate the filter element, the period of the vibration will be long, and the time will not be significantly shortened.

On this point, the pulse jet method has the advantage that dust can be removed in a short time because it instantly generates intense vibrations.

However, in all of the above-mentioned conventional methods, the dust that is brushed off is prevented from falling by backwash air or by the flow of dust-containing gas in the flow path, floats nearby, and adheres to the adjacent filter element. There was a problem that it was easy to separate the particles and that complete separation was not possible.

In addition, if you want to partially repair a switchgear, in the conventional systems mentioned above, the switchgear and on-off valves were operated using mechanical cranks and cams, so each switchgear is interlocked and only one can be repaired. There was a problem in that the entire device had to be stopped and replaced because it could not be stopped.

Therefore, the present invention is a device that takes advantage of the advantages of the pulse jet method, and also makes the flow direction of the dust-containing gas in the flow path the same as the falling direction of the dust that has been brushed off, so that the dust can fall quickly. It is an object of the present invention to provide a dust separator which prevents dust from being adsorbed by adjacent filter elements, and which also allows part of the opening/closing device to be replaced even while the device is in operation.

(Means for Solving the Problems) A feature of the present invention for achieving the above object is that the dust collector main body 1 is formed as a single rectangular chamber, and the dust collector body 1 is formed as a single rectangular chamber, and the dust collector A suction part 2 for sucking gas containing gas is formed as an opening, a dust fall path 4 is formed in the lower part of the main body 1, and one side wall 8 of the main body 1 has many vertically elongated filter element insertion/removal ports 9 in the horizontal direction. A plurality of insertion/ejection ports 9 adjacent to each other in the horizontal direction are formed into one group, and the spacing between the insertion/ejection ports 9 in adjacent groups is wider than the spacing between the insertion/ejection ports 9 in one group. , a flat box-shaped filtration element 10 is removably inserted into the insertion/removal port 9;
One side located at is a clean gas outlet 15,
The gas discharge path 2 is formed by the wall surface 24 attached to the main body side wall 8 covering the gas outlet 15 and the main body side wall 8.
6 is formed, and the gas discharge path 26 is connected to the insertion/removal port 9.
The wall surface 24 is provided with a door 34 for taking out the filtration element, which can be freely opened and closed. are connected to the clean gas discharge pipe 29, and the respective divided passages 26' and the discharge pipe 29 are connected to the clean gas discharge pipe 29.
An opening/closing device 27 that can freely open and close the communicating portion with the opening/closing device 9 is provided for each division passage 26' so as to be able to operate independently. The point is that an injection pipe 22 for injecting compressed air is provided at the outlet 15.

(Function) According to the present invention, the dust-containing gas enters the main body of the dust collector from the suction section at the upper part of the main body. The heavy dust falls directly onto the dust fall path below. The light dust flows downward with the gas, the gas passes through the filtration element, and the dust adheres to the filtration element. The clean gas that has passed through the filter element flows through the exhaust channel and through the exhaust pipe.

The discharge passage is a divided passage, and each divided passage is sequentially opened and closed by an opening/closing device. No clean gas flows through the divided passages closed by the switchgear. In this closed division, the jet stream is injected into the filter element from the jet tube. This causes the filtration element to vibrate as it expands and contracts, and the attached dust is brushed off. Since the interior of the main body is a single chamber, the dust that is brushed off quickly falls downward along with the flow of dust-containing gas. At this time,
The filtration elements are divided into groups and there is a wide interval between the filtration elements of adjacent groups, so that the dust that is brushed off is less likely to adhere to the adjacent filtration elements and falls quickly.

Note that since the opening/closing device is designed to be able to be operated independently, if a part of the opening/closing device is damaged, only that device can be repaired without stopping the entire dust collector.

Furthermore, since the filter element removal door is provided on the wall surface forming the discharge passage, the filter element can be replaced from the clean air side.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figures 1 and 2 show an overall view of an example of a dust collection system, in which the gas containing dust is sucked in from above and only the gas is extracted from the sides, while the dust is collected downward in the same direction as the gas flow. This is a so-called tower-type dust collection system that separates and collects dust.

Reference numeral 1 denotes the main body of the dust collector, which is formed into a single rectangular cylindrical chamber, and the main body 1 has an opening-shaped suction part 2 at the upper end through which gas containing dust is sucked, and is arranged so as to face the suction part 2. The main body 1 is equipped with a dust fall path 4 and a dust collection port 5 at the lower end thereof, and a rotary valve 6 for discharging dust is connected to the dust collection port 5. , installed on the support frame 7.

In the side wall 8 of the main body 1, filter element insertion/removal ports 9 each having a vertically elongated rectangular shape are provided in rows in the horizontal direction and in multiple stages vertically. The filter elements 10 are each inserted into the main body 1 in a cantilevered manner, and as shown in FIGS. 3 and 4, each filter element 10 can be attached or detached as needed by a fixing means 12 via a support part 11. There is.

Each insertion/extraction port 9 is made into a group of three in the horizontal direction, and the spacing between the insertion/extraction ports 9 between adjacent groups is as follows:
The interval is wider than the interval between the insertion/removal ports 9 within one group.

As shown in FIGS. 3 and 4, the filter element 10 includes a box-shaped filter frame 13 that can be fitted into the insertion/removal port 9, and a filter frame 13 that is fitted into the main body 1. The filtration element 10 has a so-called flat box shape, and has a gas outlet 15 formed on one side wall 8 of the main body 1. There is. Further, a suppressing member 16 is wound around the outer circumference of the filtering medium 14 to prevent excessive expansion of the filtering medium 14, and a plurality of suppressing members 16 are arranged in the lateral direction of the filtering element 10, as shown in FIG. , the filter medium 14 is configured to be able to vibrate slightly in a divided state. Bench lilies 17 are installed in the gas outlet 15 at appropriate intervals in the vertical direction and extend in the same direction as the lateral direction of the filter frame 13. This bench lily 17 is a compressed flow jetting means, and is provided with a compressed flow receiving port 18 and a compressed flow discharge port 19.
9 is installed so as to penetrate into the filter element 10.

20 is a compressed air injection device, and each of the filter elements 1
Compressed flow injection ports 21 each facing the bench lily 17 of 0
A plurality of compressed flow injection pipes 22 are arranged in parallel in the horizontal direction in correspondence with the filtration elements 10, and are communicated with a focusing pipe 35 at the upper part.
is connected to a compressor (not shown). Further, an injection control unit including an electromagnetic valve 23 is provided between the focusing pipe 35 and each compressed flow injection pipe 22, and the control unit is configured to freely inject compressed air as appropriate at predetermined time intervals. .

A wall surface 24 for a gas discharge path is provided on the outer surface of the one side wall 8 of the main body 1 and surrounds the gas outlet ports 15 and injection pipes 22 of the plurality of filtration elements 10, and the wall surface 24 and the one side wall 8 form a gas discharge path. 26 is formed. The gas discharge path 26 is divided into sections in the horizontal direction by a plurality of partition plates 25 provided in the vertical direction according to the units of the filter elements 10 arranged in parallel (every three rows in the embodiment). (6 in the embodiment) dividing paths 26' are constructed. Further, a communication pipe 28 projecting outward is provided at the lower end of each divided passage 26', and each communication pipe 36 is provided with a communication pipe 28 projecting outward.
and a discharge pipe 29 constituting the gas discharge path 28 are communicated with each other through an elbow pipe 37. Then, the flange portion 33 protrudingly formed within each connection portion between the communication pipe 36 and the elbow pipe 37 is connected to the outside, that is, the elbow pipe 3
Opening/closing device 2 that opens and closes from the 7 side by linear reciprocating motion
7 is provided for each dividing path 26'. Further, in order to suck and discharge the gas in each of the divided passages 26', a flow device consisting of a blower is connected to the discharge pipe 29, and the flow device causes the gas to flow from the suction section 2 to the discharge section 28. There is. The opening/closing device 27
is constituted by an air cylinder 30 and a poppet damper 32 provided at the end of a cylinder rod 31, and is configured as a valve opening/closing type in which the flange portion 33 can be freely closed by the poppet damper 32 as the rod 31 advances and retreats. . Each dividing road 2
The opening/closing devices 27 of 6' are constructed so that they can be operated independently. Then, the dividing path 26'
is closed by the operation of the opening/closing device 27, and after a predetermined time (5 seconds in the embodiment) has elapsed, the solenoid valve 23 of each compressed flow injection pipe 22 provided in the divided passage 26' is operated, and the valve is closed for a predetermined time (5 seconds in the embodiment). Compressed air is injected into each filter element 10 (0.1 seconds in the embodiment), and after a predetermined period of time (5 seconds in the embodiment), the opening/closing device 27 is operated again to open the dividing passage 26', and the other The dividing passage 26' is configured in a circulating manner to operate in the same manner as described above.

In addition, a door 34 for taking out a filter element that can be opened and closed is provided on the wall surface 24 for the gas discharge path.

The embodiment of the present invention is constructed as described above, and when the flow device consisting of a blower is operated, a suction state from the suction section 2 to the discharge section 28 is obtained, and the gas containing dust is removed from the suction section 2. When feeding through the poppet 3, first the filter medium 14 of each filter element 10 is
After the dust is adsorbed, only the remaining gas passes through each gas outlet 15, and then through each dividing path 26' and discharge pipe 29, so-called filtration gas is discharged from the flow device. During this series of processes, each dividing path 26'
At each time, the steps of closing the dividing passage 26', blowing out compressed air, and opening the dividing passage 26' are performed in sequence at predetermined time intervals. Therefore, the compressed air from the compressor is received by the bench lily 17 and instantaneously becomes expanded gas, which causes instantaneous expansion and slight vibrations in the filter medium 14 of the filter element 10.
Due to the expansion and slight vibration, dust adsorbed on the filter medium 14 is brushed off from the filter medium 14. At this time, the divided passage 26' is closed and the compressed air is injected after a predetermined period of time. In other words, the compressed air is compressed when the gas flowing due to the suction state does not flow into the divided passage 26'. Since the air is injected, unlike the case where fluid gas flows in from the opposite direction, a reduction in the jetting force of the compressed air can be prevented, and the expansion and micro vibration can be efficiently generated in the filter medium 14. Furthermore, after a predetermined period of time has elapsed after compressed air injection,
Since the dividing path 26' is configured to be opened, the dust particles that have been brushed off are sufficiently dropped downward together with the flowing gas without being sucked in the direction of the dividing path 26'.

Therefore, the dust can be completely removed, a sufficient dust separation function can be achieved, and a good filtration effect can always be maintained. As mentioned above, unlike when high-pressure compressed air is injected against the flowing gas, the jet force of compressed air can be used effectively, so even low-pressure compressed air can serve the purpose, and the capacity of the compressor is also small. This can save energy. In addition, by making the filter element 10 into a flat box shape, compared to a normal cylindrical type,
The amplitude of the jet of compressed air is increased, and thereby the effect of separating dust from the filter medium 14 is also increased. Furthermore, if a desired gas flow rate is set using the divided passages 26' other than the blocked divided passage 26', the filtration gas can be kept at a constant constant level, unlike when compressed air is injected into the flowing gas. Flow rate can be obtained.

Further, as shown in FIGS. 5 and 6, the gas sucked from the suction part 2 at the upper end is guided into the single-chamber device main body 1, and while being guided inside the device main body 1 from the top to the bottom. The filtered gas passes through each filter element 10 and is guided to each dividing passage 26' on the side of the device main body 1, and then is discharged from a lower discharge pipe 29,
On the other hand, during this time, dust separation processing is performed for each 10 unit of each filter element, and the dust is discharged from the lower dust fall passage 4 through the dust collection port 5. It is a flow in a constant direction that is guided into the device main body 1 from the side wall 8 and discharged from the lower discharge pipe 29 through each dividing passage 26', and even by an instantaneous jet of compressed air. After all, the gas flow is not disturbed, and therefore a stable flow rate of filtered gas is obtained. In addition, even while the dust separation process is being performed, since the main body 1 of the apparatus is a single chamber, a constant downward flow is always generated within the main body 1, as shown by the arrow. Therefore, the dust separated from each filter medium 14 does not fly up, and due to the cooperation between the natural fall due to gravity and the downward flow of gas, even light floating dust can be efficiently and quickly removed. Since it is dropped downward and the distance between the filter elements in the adjacent group is wide, there is no risk of the dust being sucked into the filter material 14 again, and the dust is completely brushed off. Separation function can be demonstrated.

Further, the communication portion between each division passage 26' and the discharge portion 28 is composed of a communication pipe 36 and an elbow pipe 37 provided at the lower end of the division passage 26' so as to protrude outward. Since the poppet damper 32 is configured to open and close from the elbow pipe 37 side, that is, from the outside, the cylinder rod 31 etc.
6', therefore, disturbances in the flow of gas passing through the dividing passage 26' can be prevented, and a stable gas flow can be obtained. Further, since the opening/closing device 27 which opens and closes by linear reciprocating motion is provided for each divided path 26', the opening/closing state of the flange portion 33 can be switched instantaneously, which is efficient. Furthermore, since the elbow pipe 37 and the opening/closing device 27 are arranged outside the lower end of the dividing path 26', even if the dust collector main body 1 is large, they are located at a relatively low position, and the opening/closing device 27 maintenance and inspection work becomes easier, and maintainability can be improved. Further, since the opening/closing device 27 is driven by a cylinder 30 that can be operated independently, even if one of them breaks down, it can be repaired without stopping the others.

Incidentally, in the above embodiment, the single dividing path 26'
Although this is explained as a method for separating dust in each case, a plurality of (for example, two) dividing paths 26'
It may be possible to perform the above-mentioned processing for each cycle and sequentially circulate, and is not limited to the embodiment.

(Effects of the invention) According to the invention, since the flow of the dust-containing gas and the falling direction of the dust that has been brushed off are the same, even light floating dust can fall efficiently.
Furthermore, since the filter elements are divided into groups and wide intervals are provided between the groups, falling dust will not adhere to adjacent filter elements again.

Furthermore, since the switching devices are designed to be able to be operated independently, even if one of them breaks down, it can be repaired without stopping the others, making maintenance easier.

Furthermore, since the filter element removal door is provided on the wall surface forming the discharge passage, the filter element can be replaced from the normal air side, making maintenance easier.

[Brief explanation of the drawing]

Fig. 1 is a central half-sectional front view showing the entire device according to an embodiment of the present invention, Fig. 2 is a side sectional view of Fig. 1, and Fig. 3 is a side sectional view of Fig. 1.
The figure is a partially enlarged view of FIG. 2, FIG. 4 is a plan view based on FIG. 3, and FIGS. 5 and 6 are explanatory diagrams showing the flow of gas. 1... Dust collector main body, 2... Suction section, 4... Dust falling path, 8... Side wall, 9... Insertion/removal port, 10...
Filtration element, 15... Gas outlet, 22... Injection pipe, 24... Wall surface, 26... Gas discharge path, 26'
... Divided path, 27 ... Opening/closing device, 29 ... Discharge pipe, 30 ... Cylinder, 34 ... Filter element extraction door, 36 ... Communication pipe.

Claims (1)

[Scope of utility model registration request] A dust collector main body 1 is formed as a single rectangular chamber, a suction part 2 for sucking dust-containing gas is formed in the upper part of the main body 1, and a dust fall path 4 is formed in the lower part of the main body 1. A large number of vertically elongated filtration element insertion/removal ports 9 are formed in one side wall 8 of the main body 1 in the horizontal direction, and a plurality of the insertion/removal ports 9 that are adjacent to each other in the horizontal direction are grouped into one group. The spacing between the insertion/ejection ports 9 between groups is wider than the spacing between the insertion/ejection ports 9 in one group, and a flat box-shaped filtration element 10 is removably inserted into the insertion/ejection port 9. One side of the element 10 located at the insertion/removal port 9 is a clean gas outlet 15, and a gas exhaust path 26 is formed by the main body side wall 8 and a wall surface 24 attached to the main body side wall 8 covering the gas outlet 15. , the gas discharge passage 26 is provided with a plurality of division passages 26' divided in the horizontal direction corresponding to each group of the insertion/removal ports 9, and a filter element extraction door 34 is provided on the wall surface 24 so as to be openable and closable. The lower part of each divided passage 26' is connected to a clean gas discharge pipe 29, and an opening/closing device 27 that freely opens and closes the communication portion between each divided passage 26' and the discharge pipe 29 is connected to each divided passage 26. Each division passage 26' is provided with an injection pipe 22 for injecting compressed air to the gas outlet 15 in the division passage 26' which is closed by the opening/closing device 27. A dust separation device in a dust collection system characterized by: