JPS6212190Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to a technical field in which exhaust is performed independently of each other from dust source devices installed at a plurality of locations in a factory or the like.

Therefore, in this invention, the dust collection hoods installed in each of the dust generation source devices in a single workplace, which are installed at multiple predetermined locations in a factory etc. and whose installation positions can be changed, are connected to one another through branch dust collection ducts. This relates to a local exhaust system that is connected to a main merging duct, the merging duct is connected to an exhaust stack and faces the outside air, and dust is exhausted by an exhaust fan. This relates to a local exhaust system in which an exhaust fan is provided, a check valve is provided downstream, the branch ducts are of the same standard except for length, and the merging ducts are of equal cross-section and are connected by connecting ducts.

As is well known, in various factories, there are dust generating devices that generate mist, dust, etc. from polishing, cutting, painting, etc. However, due to line and facility constraints, they cannot be installed centrally, and therefore must be vented. , resulting in unfavorable working conditions.

To deal with this, as shown in Figs. 1 and 2, dust generation source devices 1,
Dust collecting hoods 2 are connected to the merging duct 4 through branch ducts 3, 3', 3'', and are controlled by the control device 5 through lead wires 6. The generated dust is sucked in and exhausted from the exhaust pipe 8 to the outside of the building, so this is a typical local exhaust system 9.

Since the amount of dust generated by each dust source device 1, 1', 1'', etc. differs depending on the type of work, operating conditions, etc., the air volume also generally differs. The diameters of the ducts 3'' are also designed to vary accordingly to maintain a constant air velocity within the duct and prevent dust from accumulating.

Therefore, depending on the installation position of the dust source devices 1, 1', 1'', the branch ducts 3, 3', 3'', and even the merging duct 4 are custom-designed and uniquely designed, resulting in high costs. Moreover, if the dust source devices 1, 1', 1'', etc. and their installation locations were changed due to product changes, line changes, etc., the entire design would have to be redesigned, which also had the disadvantage of being extremely economically wasteful. .

In addition, although each particulate source device 1, 1', 1''... has an independent operating state depending on the type of work, work conditions, etc., the branch ducts 3, 3',
3"..., so independent intermittent movement is not possible. Therefore, not only is there a disadvantage that the operating efficiency of the exhaust fan 7 is poor, but also the individual Dust source device 1, 1', 1''...
It is necessary to adjust the air volume to a predetermined air volume while looking at the relationship with the air volume of other dust generation source devices 1, 1', 1'', and the management of the control device 5 is also complicated. The work required skill and was extremely cumbersome, and as mentioned above, there was also the problem that if the line was changed, the management system and program had to be changed significantly.

Therefore, a damper that is linked to each dust source device 1, 1', 1'', etc., and a damper that is linked to each dust source device 1, 1', 1'', which controls the air volume of the exhaust fan 7 are provided. Although this is possible, there is also the problem that controlling the damper is similarly difficult due to the design, which negates its feasibility.

The purpose of this invention was to take into account the problems of local exhaust technology for distributed dust source devices based on the conventional technology, and to install an exhaust fan in the branch duct for each dust source device to enable individual control, and to create positive pressure by independently operating. The present invention aims to provide an excellent local exhaust system that checks for backflow to other branch ducts via a check valve, allows recombination according to the same standard, and reduces costs.

The structure of this invention, which meets the above objectives, is that each dust generating device installed at a predetermined location is operated independently of the other, and the dust is sucked in by an exhaust fan operated by a control device that is directly connected to the operating conditions. By design, the dust-containing intake air is separated via a coarse particle separator, flows through a branch duct with the rated size, flows through a merging duct with a cross section of the same rated size, and is discharged to the outside air from the exhaust stack. Check valves automatically check for positive pressure backflow to the pipes, and each unit is operated independently to save energy, and by combining standardized ducts, it is easy to rearrange equipment in the event of equipment changes, reducing equipment costs. It is.

Next, one embodiment of this invention will be described below based on FIGS. 3 and 4. Note that the same parts as in the embodiments in FIGS. 1 and 2 will be explained using the same reference numerals.

Reference numeral 9' denotes a local exhaust system which forms the gist of this invention, and in accordance with the line design in the factory, in the embodiment, there are four manufacturing and processing equipments 1, 1', 1″,1 is installed.

Dust collection hoods 2, 2, . . . are faced to each of the dust generation source devices 1, 1' through appropriate frames, brackets, etc. (not shown), and flexible dust collection hoses ₃₀ , ₃₀ , . , for example, a coarse particle separator 10, 10', 10'', such as a bag filter.
10.

Depending on the design and operating conditions and facilities, the coarse particle separators 10, 10', . . . may be omitted from each or all of the devices.

A blower type exhaust fan 7' and a butterfly valve type check valve 11 are arranged in series at the rear stage of each of the coarse particle separators 10, 10'. It is connected to a discharge pipe 41 of the same rated cross section of one merging duct 4' through a flexible branch duct ₃₀ ' which has a standard cross section and can be connected in a predetermined design via a joint.

Each of the discharge pipes 41, 41... is a straight pipe with the same cross section, and a curved pipe connecting duct 42, 42..., 4.
3 are connected into one to form a confluence pipe 4, and an exhaust pipe 8
It is connected to the air so that it faces the atmosphere.

In addition, each of the above-mentioned exhaust fans 10, 10', 10'', 10
is interlocked with the dust generation source devices 1, 1', 1'', 1 via the control device 5' by the lead wire 6 as appropriate, and the operating status of each dust generation source device 1, 1', 1'', 1 is controlled. It is designed to start and stop by.

In the above configuration, dust source devices 1, 1', 1'', 1
When any one or more of them independently operates and generates dust, the corresponding control device 5' is operated in conjunction with the control device 5' to operate the exhaust fan 7' in an optimal control state.

Therefore, the generated dust, mist, etc. are sucked in from the dust collection hood 2 by the suction wind, and the coarse particles are drawn into the separator 1.
The fine dust is separated and removed by the suction air, and the fine dust passes through the exhaust fan 7' and the check valve 11, enters the branch duct ₃₀ ' and the merging duct 4', and if multiple units are in operation, merges and flows into the exhaust pipe. 8, it is released into the atmosphere.

During this time, at least one dust source device 1, (1',
1'', 1) is in a non-operating state, the branch duct ₃₀ ' in operation is brought to positive pressure by the air blowing from the exhaust fan 7', so that the branch duct 3 in the non-operating state
₀ ' check valve 11 automatically closes to prevent back spray from the dust collection hood 2.

Of course, there is no problem if all units are operating.

Therefore, if the installation position or type of the dust source device 1, 1', 1'', 1 is changed, the branch duct ₃₀ after the check valve 11 can be connected to a specified position via a joint (not shown). The discharge pipes 41, 41... are connected to the connecting duct 42,
42... are connected and disconnected to a predetermined length and connected to the bent pipe 43 and then to the exhaust pipe 8.

Therefore, even if the position of the particulate source device 1, 1', 1'', 1 is changed or increased or decreased due to line changes or product changes, the design of the duct assembly will be based on joints and joining ducts with the same rating. It is sufficient to add, subtract, add, or remove items of the same type, and there is no need for any special design and it can be rearranged at an early stage.

It should be noted that if the control device is of an automatic load responsive type and is assembled with the dust collecting hood 2, the coarse particle separator 10, and the check valve 11, there is no need to change the design.

Furthermore, it goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments; for example, various embodiments such as providing a microfilter or an electrostatic precipitator in the exhaust stack can be adopted. Design changes such as replacing branch ducts with pipes are also possible.

As mentioned above, according to this invention, the exhaust systems for each dust source device basically operate independently of each other, so that they operate only when dust is being removed, which minimizes power costs and is extremely beneficial in terms of energy conservation. It has certain excellent effects, and it has the advantage of reducing the initial cost to some extent or even the running cost, which is economically advantageous in the long term.In addition, by operating independently of each other, each dust source device ′, 1″, etc., the air volume can be easily adjusted.

In addition, since the ventilation devices are interlocked with the operating status by the control device provided for each unit and controlled to start and stop in conjunction with each other, there is also the effect that optimum operation control can be performed.

Further, by interposing a check valve at the rear stage of the exhaust fan, the positive pressure of exhaust air from the operating exhaust fan is checked by the check valve, and there is an effect that no backflow is blown out from the non-operating branch duct.

Furthermore, by installing a coarse particle separator in the front stage of the exhaust fan and by preventing waste dust from accumulating in the branch duct, the pipe diameter does not change economically, and the duct can have the rated cross section regardless of the flow velocity. The same rated cross section can be used for the ducts, which makes it possible to standardize the duct assembly. Therefore, it is possible to design a combination system, and by changing the line or product, it is possible to change the particulate source device or its installation position. Even if the exhaust plant changes, it is possible to expand and contract through conversion and reuse by adding joints, connecting ducts, etc. with the same rated cross-section, and removing them, making it possible to change the exhaust plant freely and quickly without having to order special designs or ducts. It has an excellent effect of reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a local exhaust system based on the prior art, Fig. 2 is a plan view of the same part, and Fig.
Figure 4 is a schematic explanatory diagram of one embodiment of this invention.
FIG. 3 is a schematic side view, and FIG. 4 is a plan view of the same portion. 1, 1', 1'', 1...Dust source device, 2...Dust collection hood, ₃₀ '...Branch duct, 8...Exhaust stack,
9'...local exhaust device 7'...exhaust fan, 11...check valve, 4'...merging duct.

Claims (1)

[Scope of utility model registration request] A dust collection hood facing each dispersed dust source device is connected to a branch duct, and each branch duct is connected to a single merging duct that connects to an exhaust stack. A local exhaust system characterized in that the branch duct is provided with an exhaust fan at the rear of the dust collection hood and a check valve at a subsequent stage, and the merging duct is formed to have an equal cross section.