JPH07214327A - Push pull type ventilator - Google Patents

Abstract

PURPOSE:To obtain a push-pull type ventilator having a high induction effect by providing the upper part of the side wall of a booth with an air feeding means and providing the opposite side with a discharging means. CONSTITUTION:A welding point is enclosed by the booth 1. A square cylindrical partition having a desired shape and size is composed by combining the side wall 1A and a top plate 1B. The upper part of the side wall 1A is provided with the air feeding means 2 having a main blow-off port 2B in an approximately horizontal direction. The opposite side of this side wall 1A is provided with the discharging means 3 having suction ports 3B, 3C facing the main blow-off port 2B. The air feeding means 2 and the discharging means 3 are respectively composed of single units and are constituted mountable at the proper points of the booth. These means are so constituted as to attain the air feed rate: discharge rate=9:10. As a result, the flexible system meeting an equipment environment is built.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a push-pull type ventilation device for exhausting oil mist (oil mist) generated in a welding process of a manufacturing plant by utilizing the attraction effect of air supply.

[0002]

2. Description of the Related Art Generally, as a ventilation device for oil smoke in a welding zone of a manufacturing plant, (1) an exhaust type ventilation device having only an exhaust means (2) a push-pull type ventilation device having an air supply means and an exhaust means Two types are known.

Of these, as shown in FIG. 7, the exhaust type ventilation system of (1) supplies air by a draft (air flowing in from a gap) from the periphery of the booth 50, and by this air supply, a welding point 51. The generated oil smoke 52 is attracted upward and is exhausted (EA) from the exhaust portion provided on the ceiling surface, but air conditioning is not performed because it may interfere with air conditioning around the booth. Applies only to factories.

On the other hand, the push-pull type ventilation device of (2) is provided with an air supply means and an exhaust means for the local welding zone as shown in FIG. This push-pull type ventilation device 60 is provided with a box-shaped exhaust hood 63 having a suction port 65 of an exhaust duct 64 at the center of the upper surface of a booth 61 having a side wall 62 made of a heat-resistant vinyl curtain, and an exhaust hood. 63 and the booth side wall 62 are formed in the circumferential chamber 66, and the air outlet 6 of the air supply duct 67 is provided.
8 are provided. Further, on the lower surface of the angular chamber 66,
A blowout slit 60 is provided over the entire circumference.

For this reason, in the booth 61, the supply air flows down along the inner surface of the side wall 62 of the booth, merges at the center, and further rises while attracting the oil smoke generated at the welded part at the center of the booth, and then upwards. The exhaust hood 63 is configured so that air can be exhausted from the suction port 65.

The push-pull hood having such a structure is
It has the advantage that the air load in the site can be reduced and the exhaust efficiency can be improved by utilizing the effect of attracting oily smoke due to local air supply. Therefore, a ventilation system using a push-pull type ventilation device has been widely introduced in manufacturing plants equipped with air-conditioning equipment.

[0007]

However, the above-mentioned conventional push-pull type ventilator has the following drawbacks.

The inside of the booth is cooled by the air supply,
It interferes with work.・ Oil smoke may flow out of the booth due to volume expansion during welding because the ventilation system alone balances air supply and exhaust.

The hood must be made for a wide variety of welding machines, which increases the cost and the construction period.・ Many parts are installed during production machine operation,
It is a danger.

In recent years, with the sophistication of air conditioning systems in factories, there has been a demand for the development of a push-pull type ventilation device capable of overcoming these drawbacks. The present invention has been made to solve such a conventional problem, and an object thereof is a push-pull type which has a large effect of attracting oil smoke and can be flexibly mounted in a short period by modularization. To provide a ventilation system.

[0011]

In order to achieve the above object, a push-pull type ventilation device according to a first aspect of the present invention is an air supply means having a substantially horizontal main outlet on the upper side wall of a booth covering a welding zone. And an exhaust means provided with an inlet facing the main outlet on the side opposite to the side wall.

According to another aspect of the push-pull type ventilation device of the present invention, each of the air supply means and the exhaust means is composed of a single unit, and can be mounted in an appropriate place of the booth. In the push-pull type ventilation device of the third aspect, the air supply unit and the air exhaust unit are set to supply air amount: exhaust amount = 9: 10.

According to another aspect of the push-pull type ventilation device of the present invention, the air supply means is provided with a downward surplus air outlet. In the push-pull type ventilation device according to the fifth aspect, the main outlet is a linear opening with a variable outlet angle.

According to a sixth aspect of the push-pull type ventilation device, the exhaust means is provided with a punching metal plate having a porosity of 35% at its suction port. According to another aspect of the push-pull type ventilation device of the present invention, the surplus outlet has a shutter for adjusting the opening area thereof.

[0015]

In the push-pull type ventilation device according to the first aspect of the present invention, the air supply blown out in a substantially horizontal direction from the main air outlet of the air supply means on the upper side wall of the booth attracts oil smoke generated from the welded portion. , Is sucked from the suction port of the exhaust means installed opposite to the main outlet. Therefore, oil smoke is mainly attracted and exhausted only in the upper space of the booth.

In the push-pull type ventilation device according to the second aspect of the invention, the air supply means and the exhaust means, which are configured as a single unit, are mounted at appropriate places in the booth, and a flexible system according to the facility environment can be constructed. it can.

In the push-pull type ventilation device of the third aspect, the inside of the booth is maintained at a slightly negative pressure by the air supply means and the air exhaust means configured so that the air supply amount: the exhaust amount = 9: 10. It is possible to prevent leakage of oily smoke.

In the push-pull type ventilation device according to the fourth aspect, the surplus air supply is blown out from the downward surplus air outlet provided in the air supply means, and the balance between air supply and exhaust is maintained while preventing draft below the booth. can do.

In the push-pull type ventilation device of the fifth aspect, the supply air is blown out from the linear opening whose blowing angle is variable, and the oil smoke can be optimally attracted and exhausted. In the push-pull type ventilation device according to claim 6, the suction port has a wide suction area through a punching metal plate having a porosity of 35%, without reducing the exhaust effect.
The air supply and oil smoke can be sucked and exhausted.

In the push-pull type ventilation device according to the seventh aspect of the present invention, by adjusting the opening area of the surplus air outlet with the shutter, the air flow amount between the air supply amount from the main air outlet and the air supply amount from the surplus air outlet is balanced. Adjusted.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 illustrates the principle of an embodiment of the push-pull type ventilation device according to claims 1 to 7.

In the figure, reference numeral 1 represents a booth of a push-pull type ventilation device 100 according to this embodiment. This booth 1
Are provided so as to surround the periphery of the welding point. As shown in FIG. 4, the side wall 1A and the top plate 1B of the booth 1 are composed of a panel P having a modular structure, and by appropriately selecting and combining the panels P having predetermined dimensions, a desired shape can be obtained according to the equipment situation. It is possible to flexibly configure a square tubular partition of the size

The panel P is made of a transparent acrylic plate held by a metal frame and is constructed so as to prevent heat exchange between the factory air and the booth air. An air supply unit (air supply unit) 2 is provided on the upper side wall 1A of the booth 1 on the doorway 1D side so that the air supply air can be blown into the booth 1. Here, the air supply unit 2 includes the panel P on the side wall 1A.
In addition, it is configured so that it can be simply attached (fixed with screws, etc.) without using special mounting equipment.

As shown in FIG. 2, the air supply unit 2 is composed of a box body having an L-shaped cross section, the upper surface of which is connected to the air supply duct 2A, and the front surface of which is a main air outlet including a linear opening for varying the wind direction. 2B, and a surplus outlet 2C on the bottom surface. The excess air outlet 2C is provided with a shutter S for adjusting the opening area, and by opening and closing the shutter S, the amount of air supplied from the main air outlet 2B and the excess air outlet 2C.
The balance of the amount of air blown out from can be adjusted appropriately.

The air supply unit 2 may be installed inside the booth 1 or outside the booth 1. The surplus outlet 2C is located inside the booth 1 when installed inside and outside the booth 1. It will be located outside. Therefore, depending on the mounting position of the air supply unit 2, the state of the air supply air in the booth 1 and the balance between the total air supply amount and the total air exhaust amount change.

First, the air supply unit 2 is basically installed inside the booth 1. In this case, as shown in FIG. 1, both the main outlet 2B and the surplus outlet 2C are located inside the booth 1, and the protrusion 2D at the rear of the air supply unit 2 is
It will protrude outside the booth 1. Here, a roll shutter R having a roll-up type curtain is provided below the protrusion 2D so that the entrance / exit of the booth 1 located below the air supply unit 2 can be blocked.

The main air supply blown out from the main outlet 2B flows almost horizontally above the booth 1 while attracting oil smoke rising from the welding point, while the surplus air supply blown out from the surplus outlet 2C. Will go around to the lower side of the booth 1 and then rise while attracting oily smoke. And
As will be described later, both supply air streams are exhausted from an exhaust port 3B of an exhaust unit (exhaust means) 3 installed opposite to the main outlet 2B (FIG. 3).

The air amount balance between the main blowoff amount and the surplus blowoff amount can be adjusted by the shutter S provided at the surplus blowout port 2C. That is, the air supply duct 2
If the total amount of air supplied from A is constant, the shutter S is opened and closed to appropriately adjust the opening area of the excess air outlet 2C, so that the amount of main air supply blown out from the main air outlet 2B and the amount of excess air blown. It is possible to control the ratio with the surplus supply air amount blown out from the outlet 2C.

Experiments have revealed that the ratio of the main air supply amount to the surplus air supply amount is preferably about the main air supply amount: the surplus air supply amount = 9: 1.

That is, most of the oily smoke is attracted by the main air supply blown from the main outlet 2B at the upper part of the booth 1 and about 10
The most efficient case is that the excess supply airflow of about% circulates below the booth 1 and is attracted. Therefore, also in the present embodiment, the opening of the shutter S is normally set so as to realize this ratio, but the opening of the shutter S is appropriately adjusted according to the amount of oil smoke generated. Of course good things.

According to this structure, a large attraction effect can be expected without causing a draft in a booth with a small amount of oily smoke. Further, in order to prevent oil smoke from leaking due to air expansion during welding, it is desirable to adjust the air volume balance so that the inside of the booth 1 is slightly negative pressure. Therefore, in this example, an experiment was performed in which the ratio of the supply / exhaust air volume was changed to various values. As a result, it was clarified that the optimum balance could be achieved by setting the air supply amount: the exhaust amount = 9:10, and adjustments were made to achieve this ratio.

In order to realize such adjustment, the main air supply / exhaust system is controlled so that the total air supply supplied to the air supply duct 2A and the total exhaust air exhausted from the exhaust duct 3A become 9:10. The main air supply / exhaust volume is 10: 1
It may be configured such that it is set to 0 and a damper is provided in each of the air supply duct 2A and the exhaust duct 3A to regulate the passing air volume to 9:10.

As a result, the supply airflow exiting the main outlet 2B produces an airflow exhausted from the exhaust unit 3 while attracting oily smoke in the booth 1, but even if air expansion occurs during welding, the booth 1 As a whole, the negative pressure is maintained and the oil smoke can be prevented from leaking out of the booth 1.

Next, when the air supply unit 2 is provided outside the booth 1 as shown in FIG. 4, the main outlet 2B is opened inside the booth 1, but the surplus outlet 2C is outside the booth 1. It will be opened in. In this case, a transparent vinyl ventilation shielding curtain 1C is provided at the entrance of the booth 1 located below the surplus outlet 2C. The curtain 1C shields the entrance and exit to prevent the air in the factory and the surplus air supply blown from the surplus outlet 2C from directly flowing into the booth 1.

The surplus supply airflow blown down from the surplus outlet 2C descends along the curtain 1C and prevents the conditioned air in the factory from entering the booth 1 as a draft. Further, the surplus supply airflow also has a buffering effect on the volume expansion during welding.

Even when the air supply unit 2 is provided outside the booth 1 as described above, the air supply / exhaust ratio in the booth 1 is set to the air supply amount in order to keep the inside of the booth 1 at a slightly negative pressure as described above. : It is desirable to set the displacement to 9:10. In this case, if the main air supply / exhaust amounts in the air supply duct 2A and the exhaust duct 3A are 10:10, the main air supply amount blown out from the main air outlet 2B and the surplus air supply blown out from the surplus air outlet 2C. The ratio with the amount may be set as main air supply amount: excess air supply amount = 9: 1.

Further, if the main air supply / exhaust amount itself in the air supply duct 2A and the exhaust duct 3A is set to 9:10, the shutter S of the surplus air outlet 2C is brought into a state of being almost completely closed. , Air supply volume: Displacement volume = 9:10
Can be achieved.

Next, an experiment to which this embodiment is applied will be described. In the factory in actual operation, the booth 1 has a floor area of 1 m × 2 m and a height to the bottom of the air supply unit 2 = 2.
m, the height of the upper exhaust hood H = 300 mm, and the main outlet 2B was a flat opening with a width = about 1000 mm.

The main outlet 2B is constructed so as to deliver a substantially horizontal air supply to the upper part of the booth 1. Here, various structures can be considered for the structure of the main outlet port 2B, but the present inventors have adopted a slit (simple horizontal opening), a breeze line (weak weathering opening), and a linear variable (wind direction variable opening). Experiments were conducted on three types of structures, and the draft prevention performance of each was examined.

As a result, it was clarified that the linear variable type opening was the best in terms of both cost and function, and it was adopted in this embodiment. Further, regarding the blowing angle of the air supply, it was clarified that the dip angle = about 30 degrees had the greatest effect of attracting the oil smoke, and the blowing angle was adjusted to this blowing angle.

Further, it has been clarified that the wind velocity of the supply airflow is optimally about 3 to 4 m / s, and the blowing velocity from the main outlet 2B is adjusted to this wind velocity. As described above, the exhaust unit (exhaust unit) 3 is provided on the side wall 1A opposite to the air supply unit 2.

As shown in FIG. 3, the exhaust unit 3 is provided with an exhaust duct 3A communicating with the top plate 1B, and suction ports 3B, 3C provided with punching metal plates PM in the openings. As shown in FIGS. 1 and 4, the exhaust unit 3 has suction ports 3B and 3C located in a region opposite to the main outlet 2B, and a supply airflow blown from the main outlet 2B is supplied to the booth 1
It is configured so that it can flow only in the upper part of the inside and exhaust to the exhaust duct 3A.

Here, an experiment was conducted to compare and examine the structure of the suction ports 3B and 3C between a linear opening and an opening provided with a punching metal plate. As a result, it was clarified that the punching metal type has a characteristic that the exhaust effect is not deteriorated even if the suction surface area is increased.
A punching metal plate PM is provided on the opening surface of C.

The aperture ratio of the punching metal plate PM was clarified by the same experiment that the aperture ratio was about 35%, and this value was adopted. This allows
A punching metal plate PM whose swash plate is set to an elevation angle of about 50 degrees is arranged at the suction port 3B so that the supply airflow blown out from the main outlet port 2B can be sucked almost directly.

Similarly, the suction port 3C is provided with a punching metal plate PM set in parallel with the floor surface so that the air supply flow down from the main air outlet 2B and the air flow rising from below the booth can be sucked. Has become.

Here, the diameter of the exhaust duct 3A = 200 m
m, area of suction port 3B = 1000 mm × 450 mm, area of suction port 3C = 1000 mm × 150 mm, suction wind speed = 0.8 mm / s.

When the push-pull type ventilation system of this embodiment is used in a factory equipped with air conditioning equipment, as shown in FIGS. Supply air is supplied from the supply air duct SA and is exhausted from the general exhaust duct RA.

The individual welding area LA is supplied with air from the local air supply duct OA and exhausted from the local exhaust duct EA. The air conditioning area FA and the welding area LA are operated by the booth 1 and the air supply / exhaust means with almost no mutual interference. J is an automatic welding machine.

As a result, it is possible to provide a push-pull type ventilation device which can be installed in a short period of time without affecting the surrounding facility environment while being low in cost and having high exhaust efficiency. .

[0050]

As described above, according to the push-pull type ventilation device of the first aspect, oil smoke can be attracted and exhausted mainly only in the upper space of the booth, there is no draft, and the attraction effect is high. A push-pull ventilation system can be provided.

According to the push-pull type ventilation device of the second aspect, it is possible to construct a flexible system according to the facility environment. According to the push-pull type ventilation device of claim 3, the inside of the booth can be maintained at a slightly negative pressure to maintain the balance inside the booth so as to prevent the leakage of oil smoke even if there is a volume expansion during welding. it can.

According to the push-pull type ventilation device of the fourth aspect, a buffering effect against the volume expansion at the time of welding can be exhibited, and the inside of the booth can be balanced. According to the push-pull type ventilation device of the fifth aspect, the effect of attracting oily smoke can be maximized.

According to the push-pull type ventilation device of claim 6, the suction action can be optimized. According to the push-pull type ventilation device of the seventh aspect, the ratio of the main air supply amount from the main air outlet to the surplus air supply amount from the surplus air outlet can be easily adjusted according to the environment in the booth.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram in an embodiment of a push-pull type ventilation device according to claim 1;

FIG. 2 is a perspective view showing a unit configuration of the air supply means in FIG.

FIG. 3 is a perspective view showing a unit configuration of an exhaust unit in FIG.

FIG. 4 is a perspective view showing a relationship between a panel forming the booth in FIG. 1, an air supply unit, and an exhaust unit.

5 is a principle explanatory view showing the relationship between the factory air conditioning system and the push-pull type ventilation device in FIG. 1. FIG.

6 is a principle explanatory view showing a relationship between an in-plant air conditioning system and the push-pull type ventilation device in FIG. 1. FIG.

FIG. 7 is a principle configuration diagram of an exhaust hood that supplies air from around a booth in a conventional exhaust ventilation device.

FIG. 8 is a principle configuration diagram of a conventional push-pull type ventilation device.

[Explanation of symbols]

 1 Booth 1A Side Wall 2 Air Supply Unit (Air Supply Means) 2A Air Supply Duct 2B Main Outlet 2C Excess Air Outlet 3 Exhaust Unit (Exhaust Means) 3A Exhaust Ducts 3B, 3C Suction Inlet 100 Push-Pull Ventilator P Panel R Roll Shutter S Shutter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Kuwa ▼ Tadahiro No. 1-18-22 Nishiki, Naka-ku, Aichi Prefecture Nagoya City Takenaka Corporation Nagoya Branch Office (72) Inventor Koji Miyajima Nagoya City, Aichi Prefecture 1-18-22 Nishiki, Naka-ku Incorporated company Takenaka Corporation Nagoya Branch

Claims (7)

[Claims] 1. An upper part of a side wall of a booth covering a welding zone,
Push-pull type ventilation characterized in that an air supply means having a substantially horizontal main outlet is provided, and an exhaust means having an inlet facing the main outlet is provided on the opposite side of the side wall. apparatus. 2. The push-pull type ventilation device according to claim 1, wherein the air supply unit and the exhaust unit are each configured as a single unit and can be mounted at appropriate places in the booth. 3. The push-pull type ventilation device according to claim 1, wherein the air supply unit and the exhaust unit are configured such that an air supply amount: an exhaust amount = 9: 10. 4. The push-pull type ventilation device according to claim 1, wherein the air supply unit is provided with a downward surplus air outlet on a bottom surface thereof. 5. The push-pull type ventilation device according to claim 4, wherein the main outlet is a linear opening with a variable outlet angle. 6. The push-pull type ventilation device according to claim 1, wherein the suction port is provided with a punching metal plate having an opening ratio of 35%. 7. The push-pull type ventilation device according to claim 4, wherein the surplus air outlet is provided with a shutter for adjusting an opening area thereof.