JP2011122738A - Exhaust apparatus including auxiliary exhaust nozzle and exhaust unit using the exhaust apparatus including auxiliary exhaust nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a concentrated exhaust function of an exhaust apparatus including an auxiliary exhaust nozzle. <P>SOLUTION: In the exhaust apparatus H including the auxiliary exhaust nozzle 11, an exhaust port 2 sucking interior gas R in an exhaust target region 1 while opened in the exhaust target region 1 is formed, and the auxiliary exhaust nozzle 11 jetting auxiliary gas S with respect to the exhaust target region 1 from a portion near the peripheral edge of the exhaust port 2 to the outward direction of the exhaust port 2 in a direction along the opening face of the exhaust port 2 is provided. The exhaust apparatus H includes a central wind blocking member 18 positioned partially at the center of the exhaust port 2 and restricting an exhaust port area Ae with respect to the exhaust target region 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an exhaust device with an auxiliary jet used for discharging pollutant gas or vapor generated indoors, and an exhaust unit using the exhaust device with an auxiliary jet,
More specifically, an exhaust port that sucks in the gas in the exhaust target region while being opened to the exhaust target region is formed, and auxiliary gas is introduced from the vicinity of the periphery of the exhaust port to the opening surface of the exhaust port with respect to the exhaust target region. The present invention relates to an exhaust device with an auxiliary jet port provided with an auxiliary jet port that jets outward in the direction along the exhaust port, and an exhaust unit using the exhaust device with the auxiliary jet port.

  As shown in FIG. 9A, this type of exhaust device with an auxiliary jet outlet exhausts an induced boundary flow fk as indicated by a broken line in the figure by the attraction of the gas R in the surrounding area by the jet auxiliary gas S from the auxiliary jet 11. The attraction boundary flow fk is initially formed along with the suction flow fr of the region gas R toward the exhaust port 2 by the suction action of the exhaust port 2 and the suction flow fr and the surrounding region. A boundary portion K (shown by a two-dot chain line in the figure) with the gas R flows toward the exhaust port 2, and then is separated from the suction flow fr of the regional gas R in the vicinity of the peripheral edge of the exhaust port 2. This is an air flow that merges with the jet flow fs.

  That is, this type of exhaust device with an auxiliary jet port is not provided with the auxiliary jet port 11 due to the formation of the attraction boundary flow fk, as shown in FIG. 9B (that is, the suction flow of the in-region gas R). Compared to the non-directional instrument in which the constant velocity line n of fr is a concentric circle), the expansion angle θ of the suction action around the exhaust port 2 (in other words, the suction range) is limited, and the directivity in the suction action of the exhaust port 2 give.

  Further, by giving the directivity, the suction wind speed Vz at a position of a certain distance Z from the exhaust port 2 is increased, whereby local generation of the exhaust target such as pollutant gas and steam generated locally in the exhaust target region 1 is achieved. A central exhaust function for exhausting gas G in a concentrated and efficient manner is provided.

  Therefore, if this exhaust device with an auxiliary outlet is used, the locally generated gas G to be exhausted can be effectively prevented from diffusing into the region while reducing the suction air volume Qe of the exhaust port 2, and the locally generated gas G can be effectively prevented. This makes it possible to reduce the facility and operating costs by reducing the size of the exhaust fan, and the large intake air volume Qe reduces the effect of air conditioning and heating. It can also be avoided that it causes deterioration.

  Note that the increase in the suction air velocity Vz at a position at a certain distance Z from the exhaust port 2 is the limit suction distance Zm that the suction action of the exhaust port 2 reaches (strictly speaking, the distance at which the wind velocity Vz of the suction flow fr becomes a predetermined lower limit value). ).

U.S. Pat. No. 4,043,257 Japanese Patent Laid-Open No. 2007-100780

  However, with regard to this exhaust device with an auxiliary jet outlet, in order to further reduce the equipment cost and operation cost, and to ensure that a sufficient concentrated exhaust function can be obtained under various usage conditions. Further improvement of the concentrated exhaust function is desired.

  In view of this situation, the main problem of the present invention is to improve the centralized exhaust function of the exhaust device with an auxiliary jet port by rational improvement, and to provide a highly convenient exhaust unit using the exhaust device with the auxiliary jet port. Is to provide

The first characteristic configuration of the present invention relates to an exhaust device with an auxiliary outlet,
In addition to forming an exhaust port for sucking in the gas in the exhaust target region while being opened to the exhaust target region, the auxiliary gas is introduced into the exhaust target region from the vicinity of the peripheral edge of the exhaust port in the direction along the opening surface of the exhaust port. An exhaust device with an auxiliary jet port provided with an auxiliary jet port for jetting outward the exhaust port,
A central wind-shielding member is provided that is partially located in the center of the exhaust port and restricts the opening area of the exhaust port with respect to the exhaust target area.

That is, when this type of exhaust device with an auxiliary jet port is further described, the contents of the main part of the device shown in FIG. 6B are as follows.
Qe: Suction air volume at the exhaust port 2 (m ³ / h)
Ae: Area of the exhaust port 2 (m ² )
De: Diameter of exhaust port 2 (m)
Ve: Suction air velocity at the exhaust port 2 (m / s)
Qs: Auxiliary gas ejection volume at the auxiliary ejection port 11 (m ³ / h)
As: Area of auxiliary outlet 11 (m ² )
Vs: Auxiliary gas ejection wind speed at the auxiliary ejection port 11 (m / s)
Z: Distance from exhaust port 2 Vz: Suction wind speed at a distance Z from exhaust port

The concentrated exhaust performance of this type of exhaust device with an auxiliary jet port can be expressed by the following I value indicating the ratio of the momentum of the suction gas R at the exhaust port 2 and the momentum of the jet auxiliary gas S at the auxiliary jet port 11. .
I value = (Qs · Vs) / (Qe · Ve) (Equation 1)

  Then, under the condition that the suction air velocity Ve at the exhaust port 2 and the area Ae of the exhaust port 2 are equal, the larger the I value, the smaller the expansion angle θ (suction range) of the suction action around the exhaust port 2. The suction air velocity Vz of the suction gas R at a certain distance Z from the exhaust port 2 is increased, and the concentrated exhaust function is enhanced.

  In the graph of FIG. 7, the horizontal axis represents the specific suction distance (Z / De), which is the ratio of the exhaust port diameter De and the distance Z from the exhaust port 2, and the vertical axis represents the suction air velocity Ve and the exhaust port at the exhaust port 2. 2 is a specific suction wind speed (Vz / Ve) which is a ratio to the suction wind speed Vz at a position of a distance Z from 2. The specific suction distance (Z / De) and the specific suction wind speed, (Vz / Ve) ) And the I value.

  Here, the conventional appliance H ′ (see FIG. 6B) in which the central shielding member is not provided in the exhaust port 2 and the central shielding member 18 as described above are provided in the conventional appliance H ′ to reduce the exhaust port area Ae. A comparison will be made with the device H of the present invention (see FIG. 6 (a)) that is half of H '(here, the opening area of the half is expressed as Ae / 2 for the sake of simplicity).

Assuming that the I value of the conventional device H ′ is 1.2, the following equation is established from the above [Equation 1].
I value (conventional) = (Qs · Vs) / (Qe · Ve) = 1.2 [Equation 2]

In contrast, the device H of the present invention has an area Ae of the exhaust port 2 that is half that of the conventional device H ′ (Ae / 2), and the suction air velocity Ve at the exhaust port 2 is twice that of the conventional device H ′ (represented as 2Ve). Therefore, the I value of the device H of the present invention can be expressed by the following equation.
I value (present invention) = (Qs · Vs) / (Qe · 2Ve)
= 1/2 × (Qs · Vs) / (Qe · Ve) (3)

Substituting [Equation 2] into [Equation 3],
I value (the present invention) = 1/2 × 1.2, and the I value of the device H of the present invention is 0.6. (However, the influence of pressure loss due to the central shielding member 18 is ignored)

Based on this, for example, when focusing on the specific suction distance (Z / De) = 3 in the graph of FIG. 7, in the conventional instrument H ′ having an I value = 1.2,
Specific suction wind speed (Vz / Ve) = 0.038 at (Z / De) = 3,
In the device H of the present invention with an I value = 0.6,
The specific suction wind speed (Vz / Ve) = 0.032 when (Z / De) = 3.

  However, when the suction air velocity Vz at the position of the distance Z is obtained from these specific suction air velocities (Vz / Ve), the suction at the exhaust port 2 of the device H of the present invention is compared with the suction air velocity Ve at the exhaust port 2 of the conventional device H ′. Since the wind speed Ve is twice (2Ve), it is as follows.

Suction wind speed Vz = 0.038 × Ve at the distance Z of the conventional instrument H ′
Suction wind speed Vz = 0.032 × 2Ve at the position of the distance Z of the device H of the present invention
= 0.064 x Ve

  That is, the suction wind speed Vz at the position of the distance Z from the exhaust port 2 is 1.68 times (= 0. .0) in the present invention tool H provided with the central wind shield member 18 as compared with the conventional instrument H ′ not provided with the central wind shield member. 064 / 0.038 times), and the concentrated exhaust function of the device H of the present invention is higher than the concentrated exhaust function of the conventional device H ′. This was confirmed by experiments.

  As is clear from the above, according to the above first feature configuration, the concentration for efficiently and efficiently exhausting the locally generated gas G of the exhaust target such as the pollutant gas and steam generated locally in the exhaust target region. A conventional exhaust device with an auxiliary jet port previously described with an exhaust function (that is, a function of increasing the suction air velocity Vz at a certain distance Z from the exhaust port by reducing the expansion angle θ of the suction action centered on the exhaust port) As compared with the above, it can be further improved.

  Incidentally, in order to increase the suction wind velocity Ve at the exhaust port 2, a method of reducing the exhaust port area Ae by reducing the diameter De itself of the exhaust port 2 instead of providing the central wind shielding member 18 as described above. It is done.

  However, the above-described present invention tool H (see FIG. 8 (a)) in which the central wind shield member 18 is provided to reduce the exhaust port area Ae to half of the conventional tool H '(Ae / 2), and the diameter De of the exhaust port 2. Is compared with a comparative device H ″ (see FIG. 8B) which makes the exhaust port area Ae half of the conventional device H ′ (Ae / 2) (see FIG. 8B), the device H of the present invention apparently has the exhaust port 2 Can be regarded as being equal to the conventional instrument H ′ (denoted here as De), while the comparative instrument H ″ has an exhaust port area Ae that is half that of the conventional instrument H ′ (Ae / 2). The diameter De of the mouth 2 is about 70% of the conventional device H ′ (here, expressed as 0.7 De).

  This means that the distance Z from the exhaust port 2 at which the same suction wind speed Vz can be obtained is 70% of the inventive instrument H (here, expressed as 0.7Z) in the comparative instrument H ″. As can be seen from this, the concentrated exhaust function of the device H of the present invention is higher than the concentrated exhaust function of the comparative device H ″.

  Further, when looking at the distribution of the suction air speed (2Ve) at the exhaust port 2, as shown in FIG. 8 (b), in the comparative instrument H ″, the suction air speed (2Ve) at the center of the exhaust port 2 is increased. As shown in FIG. 8 (a), in the appliance H of the present invention, the suction air speed (2Ve) around the central wind shield 18 at the exhaust port 2 is increased.

  Here, generally, near the boundary between the suction flow fr toward the exhaust port 2 and the ambient region gas R, the diffusion of the suction target gas R to the surroundings is promoted as the wind velocity Vz of the suction flow fr decreases. In the present invention instrument H, as described above, the suction air velocity Ve around the central wind shield 18 in the exhaust port 2 is increased, so that the diffusion of the suction target gas R to the surroundings is also suppressed. Is higher than the central exhaust function of the comparative device H ″.

  That is, according to the first characteristic configuration described above, the suction air velocity Ve at the exhaust port is reduced by reducing the exhaust port diameter De itself as compared with the conventional exhaust device H ′ with an auxiliary jet port not provided with the central wind shield member. Compared with the comparative device H ″ that is enlarged, the concentrated exhaust function can be further improved, and the concentrated exhaust function of the exhaust device with an auxiliary jet port can be improved extremely effectively.

  In the implementation of the first characteristic configuration, the shape of the exhaust port is not limited to a circle, and may be any shape such as a polygon such as a quadrangle, an ellipse, or a line-shaped flat rectangle.

The second feature configuration of the present invention specifies an embodiment suitable for the implementation of the first feature configuration.
The central wind-shielding member has a conical or hemispherical pointed shape at the portion toward the exhaust target area.

  That is, according to this configuration, the above-described peak shape of the central wind shield member prevents the vortex flow from being generated near the exhaust port due to the gas sucked into the exhaust port colliding with the central wind shield member. As a result, the flow of the suction gas at the exhaust port can be smoothed and stabilized, and the intended concentrated exhaust function can be improved more reliably and more effectively.

The third feature configuration of the present invention specifies an embodiment suitable for the implementation of the first or second feature configuration.
The shape of the portion of the central windshield member facing the exhaust port back side is a shape that extends to the exhaust port deep side longer than the maximum thickness dimension of the central wind shield member in a state where the cross-sectional area gradually decreases toward the exhaust port back side. It is in a certain point.

  That is, according to this configuration, the flow of the sucked gas around the central wind shield member after being sucked into the exhaust port and the flow of the sucked gas downstream from the central wind shield member that follows the central wind shield member are prevented. Smoothness and stabilization can be achieved by the shape of the wind member extending to the back side of the exhaust port as described above, and thereby, the intended concentration exhaust function can be improved more reliably and more effectively. .

The fourth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to third characteristic configurations,
An exhaust hood having a shape extending from the exhaust port toward the exhaust target area is provided, and the auxiliary jet port is disposed at the peripheral edge of the exhaust hood.

  That is, according to this configuration, the improvement of the concentrated exhaust function as described above by the provision of the central wind-shielding member and the function of suppressing the diffusion to the suction gas of the exhaust hood expanded from the exhaust port are combined, and the expected result This makes it possible to improve the concentration exhaust function of the exhaust gas more effectively, and in particular, to make the exhaust apparatus suitable for exhausting the pollutant gas generated in the form of smoke in various processing tanks, stove and other combustion apparatuses. be able to.

The fifth characteristic configuration of the present invention specifies an embodiment suitable for implementation of any of the first to fourth characteristic configurations,
The auxiliary gas jet direction of the auxiliary jet port is inclined to the upstream side in the flow direction of the suction gas to the exhaust port with respect to the opening surface direction of the exhaust port.

  That is, according to this configuration, compared with the case where the auxiliary gas is ejected outward in the direction parallel to the opening surface of the exhaust port, the expansion angle of the suction action around the exhaust port is made smaller (in other words, , The directivity of the suction action can be further increased), and the suction air speed at a certain distance from the exhaust port can be further increased. By improving the function, it is possible to more effectively achieve the expected central exhaust function.

A sixth characteristic configuration of the present invention relates to an exhaust unit using the exhaust device with an auxiliary jet port according to any one of the first to fifth characteristic configurations,
An exhaust device with an auxiliary injection port provided with the exhaust port, the auxiliary injection port, and the central wind-shielding member protrudes from the unit base, and an auxiliary gas is injected from the exhaust fan that sucks gas from the exhaust port and the auxiliary injection port The auxiliary gas fan is mounted on the unit base.

  That is, according to this configuration, the exhaust unit is brought into a place where there is a local generation of polluted gas, and the exhaust port of the exhaust device with the auxiliary jet port protruding from the unit base is directed to the source of the polluted gas. By operating the exhaust fan and auxiliary gas fan mounted on the unit base, it is possible to exhaust the pollutant gas generated at the generation source from the exhaust port intensively and efficiently.

  That is, it becomes a highly convenient exhaust unit that can be brought into various places and exhaust pollutant gases and the like intensively and efficiently.

  In the implementation of this configuration, if the unit base is a movable vehicle body provided with casters and drive wheels, the transportation of the exhaust unit and the position adjustment of the exhaust unit relative to the generation source of the contaminated gas and the like can be further facilitated.

Structural drawing of an exhaust device with an auxiliary jet port showing an embodiment Figure showing an example of application to a smoking area Structure diagram of exhaust device with auxiliary jet port showing another embodiment Schematic structural diagram of an exhaust device with an auxiliary spout equipped with an exhaust hood Diagram showing application example to exhaust unit Comparison diagram of the device of the present invention and the conventional device Graph showing the relationship between I value, specific suction distance and specific suction wind speed Comparison diagram of the device of the present invention and the comparison device Contrast diagram of exhaust device with auxiliary jet and general exhaust device without auxiliary jet

  FIG. 1 (a) shows the structure of an exhaust device H with an auxiliary jet outlet used for ventilation in a factory or kitchen, or in an office or smoking area in a longitudinal section, and FIG. 1 (b) shows the structure of the exhaust device H. Shown in cross section.

  The exhaust device H has an exhaust port 2 (that is, an exhaust suction port) that allows the opening on the front end side to face the exhaust target area 1, and an exhaust port that has the opening on the rear end side as a connection port of the exhaust duct 3. The cylinder 4 is the base.

  The exhaust tube 4 includes a front guide plate 5 extending outward from the exhaust port 2 in a direction parallel to the opening surface of the exhaust port 2 from the front end, and an auxiliary air chamber outside the front end portion of the exhaust tube 4. 6 are formed so as to extend over the entire circumferential direction of the exhaust port 2.

  In addition, a back side guide plate 8 extending from the front end of the surrounding wall 7 to the outside of the exhaust port 2 in a direction parallel to the opening surface of the exhaust port 2 is provided across the entire circumferential direction of the exhaust port 2. is there.

  A connection port 10 for connecting an air supply pipe 9 is formed in the surrounding wall 7, and clean auxiliary air S is supplied to the auxiliary air chamber 6 by an auxiliary air fan through the air supply pipe 9 connected to the connection port 10.

  A gap as an auxiliary air guide path 11a is formed between the front side guide plate 5 and the back side guide plate 8, and an annular slit-like opening formed between the leading edges of the guide plates 5 and 8 (that is, A slit-like opening across the entire circumferential direction of the exhaust port 2) is used as an auxiliary jet port 11 for ejecting auxiliary air.

  The exhaust duct 3 connected to the exhaust cylinder 4 extends from the intake port of the exhaust fan. In this exhaust device H, the internal air R in the exhaust target region 1 is sucked from the exhaust port 2 by operating the exhaust fan. In parallel, the auxiliary air S supplied to the auxiliary air chamber 6 through the air supply pipe 9 is substantially parallel to the opening surface of the exhaust port 2 from the auxiliary outlet 11 through the gap path 11a between the guide plates 5 and 8. In the direction outward (i.e., radially), and in the circumferential direction of the exhaust port 2, the air is ejected at a uniform ejection volume Qs and a uniform ejection speed Vs.

  For example, as shown in FIG. 2, the evacuation apparatus with an auxiliary jet outlet has a smoking area C as an exhaust target area 1 and is installed on the ceiling thereof. Is generated with the exhaust port 2 facing the source of the locally generated gas G.

  And in such an installation state, by sucking the auxiliary air S from the auxiliary outlet 11 as the inner air R is sucked from the exhaust port 2 as described above, the ambient inner air R by the jet flow fs of the auxiliary air S is increased. As a result of the attraction, the suction flow fr of the regional air R toward the exhaust port 2 by the suction action of the exhaust port 2 and the boundary portion K (shown by a two-dot chain line in the figure) between the suction flow fr and the ambient air R An induced boundary flow fk that flows toward the exhaust port 2 and then separates from the suction flow fr of the regional air R in the vicinity of the periphery of the exhaust port 2 and merges with the jet flow fs of the auxiliary gas S is formed (FIG. 1A). And FIG. 9 (a)).

  That is, due to the formation of the attraction boundary flow fk, as compared with a general exhaust device that does not include the auxiliary outlet 11 as shown in FIG. ) To restrict the suction action of the exhaust port 2 and to increase the suction air velocity Vz at a certain distance Z from the exhaust port 2 in accordance with the provision of the directivity. A local exhaust gas G is effectively prevented from diffusing in the region by providing a central exhaust function for exhausting the locally generated gas G from the exhaust target region 1 intensively and efficiently.

  Further, in the exhaust device H, as shown in FIGS. 1A and 1B, a state where the exhaust device H is partially located at the central portion of the exhaust port 2 (in other words, a state where the exhaust device H is limitedly positioned at the central portion of the exhaust port). ), The central wind shielding member 18 is disposed at the central portion of the exhaust port 2, so that the substantial opening of the exhaust port 2 is limited to the annular portion 2 a around the central wind shielding member 18 in the exhaust port 2. By restricting the opening area Ae of 2, the suction air velocity Ve of the air R in the suction area (suction flow fr) at the exhaust port 2 is increased as compared with the case where such a central wind shielding member 18 is not provided.

  That is, by providing the central wind shield member 18, as shown in the description of the first characteristic configuration of the present invention described above, the distance Z from the exhaust port 2 is smaller than when the central wind shield member 18 is not provided. The suction air velocity Vz at the same position is effectively increased to enhance the above-described concentrated exhaust function of the exhaust device H more effectively.

  The central wind shielding member 18 is disposed with its thickest part 18a positioned on the upstream side in the flow direction of the air R in the suction area (that is, on the exhaust target area R side), and from the thickest part 18a to the exhaust port 2. The shape of the downstream portion 18c toward the back side is an elongated conical shape that extends to the back side of the exhaust port longer than the thickness dimension d of the thickest portion 18a in a state where the cross-sectional area gradually decreases toward the back side of the exhaust port. It is.

  That is, by making the downstream portion 18c of the central wind shield member 18 into such an elongated conical shape, the flow of the intake air R around the central wind shield member 18 after being sucked into the exhaust port 2, and Further, the flow of the suction air R downstream from the subsequent central wind shielding member 18 is smoothed and stabilized.

  In the exhaust device H shown in FIG. 1, the shape of the upstream portion 18b toward the exhaust target region 1 side of the central wind shield 18 (that is, the shape of the thickest portion 18a on the exhaust target region 1 side in this example). ) Is formed in a plane shape parallel to the opening surface of the exhaust port 2 so as to eliminate the presence of a protruding portion from the exhaust port 2.

  However, instead of this, the shape of the upstream portion 18b toward the exhaust target region 1 side in the central wind shielding member 18 is changed to a conical or hemispherical pointed shape as shown in FIG. It is possible to prevent the vortex flow from being generated in the vicinity of the exhaust port 2 due to the collision with the central wind shielding member 18 and to smooth and stabilize the flow of the intake air R at the exhaust port 2.

  Further, in the exhaust device H shown in FIG. 1, each of the front guide plate 8 and the back guide plate 8 is disposed in a posture parallel to the opening surface of the exhaust port 2, and the auxiliary air S (jet flow fs) is supplied to the auxiliary jet port 11. In some cases, as shown in FIG. 3, the front side guide plate 8 and the back side guide plate 8 are sucked into the leading end side as shown in FIG. The auxiliary air S is ejected from the auxiliary outlet 11 in an inclined posture that is located on the upstream side in the flow direction of the exhaust gas 2 so that it is inclined toward the exhaust target area 1 with respect to the opening surface of the exhaust port 2. Thus, the concentrated exhaust function may be further improved.

  FIG. 4 shows an example in which an exhaust hood is combined with the above-described exhaust device H with an auxiliary jet port provided with a central wind-shielding member 18, such as a plating tank from the tip of the exhaust tube 4 forming the exhaust port 2. An exhaust hood 19 that widens toward the pollutant gas generation source T is connected.

  Then, the auxiliary jet 11 is arranged at the peripheral edge of the exhaust hood 19, and the auxiliary air S (jet flow fs) is generated from the auxiliary jet 11 in the exhaust target area 1 with respect to the opening surface of the exhaust port 2. It is made to eject in the direction of ejection inclined toward the source T side (more specifically, the direction of inclined ejection along the inclined wall 19a of the exhaust hood 19).

  That is, by combining the exhaust hood 19 in this way with the exhaust device H with the auxiliary jet outlet, the concentrated exhaust function for the locally generated gas G to be exhausted is further improved.

  In the exhaust structure shown in FIG. 4, the widening opening of the exhaust hood 19 may be regarded as corresponding to the exhaust port of the exhaust device with an auxiliary jet port provided with the central wind shielding member 18.

  FIG. 5 shows an example in which an exhaust device H with an auxiliary outlet provided with a central wind shield 18 is applied to an exhaust unit. In this exhaust unit U, an exhaust fan Fe and a box-shaped unit case 20 as a unit base are provided. Auxiliary air fan Fs is built in, and exhaust duct 3 connected to the suction port of exhaust fan Fe is fixedly projected from unit case 20, and auxiliary air supply pipe 9 connected to the discharge port of auxiliary air fan Fs is provided. Similarly, it protrudes from the unit case 20.

  Further, an exhaust side flexible duct 3 a is connected to the tip of the exhaust duct 3, and an auxiliary air side flexible duct 9 a is connected to the tip of the auxiliary air supply pipe 9.

  Then, the distal end of the exhaust side flexible duct 3a is connected to the opening on the exhaust duct connection side of the exhaust pipe 4 in the exhaust device H, and the exhaust device H is provided at the distal end of the exhaust side flexible duct 3a. The front end of the flexible air duct 9a on the auxiliary air side is connected to the connection port 10 provided in the surrounding wall 7 of the above.

  That is, in a state where the exhaust unit U is brought into a place where a pollutant gas is locally generated, the exhaust device H is oriented by bending and extending / contracting the exhaust side flexible duct 3a and the auxiliary air side flexible duct 9a, and the exhaust device The H exhaust port 2 is directed to the source T of the pollutant gas or the like.

  Then, by operating the exhaust fan Fe and the auxiliary air fan Fs with the exhaust device H adjusted in this manner, the exhaust gas H is exhausted intensively and efficiently by the exhaust device H. To do.

  A caster 21 with a stopper is attached to a unit case 20 as a unit base, so that the exhaust unit U can be transported and moved or adjusted in the installation location of the exhaust unit U.

(Other embodiments)
Next, other embodiments of the exhaust device H with the auxiliary jet outlet as described above including the central wind shielding member 18 will be listed.

  The gas R to be exhausted is not limited to the air containing the locally generated gas G such as polluted gas or vapor, and may be any gas as long as it requires exhaust.

  Further, the auxiliary gas S to be ejected from the auxiliary ejection port 11 is not limited to air, and may be any gas as long as the gas can be ejected to the exhaust target region 1.

  The jet direction of the auxiliary gas S from the auxiliary jet port 11 is not limited to the direction parallel to the opening surface of the exhaust port 2, and the direction in which the auxiliary gas S is jetted outward in the direction along the opening surface of the exhaust port 2. If so, it may be a jetting direction inclined to the upstream side or the downstream side in the flow direction of the suction gas R with respect to the opening surface of the exhaust port 2.

  The opening shape of the exhaust port 2 is not limited to a circular shape, and may be any shape such as a polygon such as a quadrangle, an ellipse, or a flat flat rectangle, and the auxiliary outlet 11 is an exhaust port. 2 is not limited to a configuration in which the exhaust port 2 is continuously provided over the entire circumference of the peripheral edge of the exhaust port 2 depending on the shape of the opening and the application, You may take the form provided only in a part of the peripheral part of the opening | mouth 2. FIG.

  In order to limit the opening area Ae of the exhaust port 2 by providing the central wind-shielding member 18 at the center of the exhaust port 2, how much the opening area Ae of the exhaust port 2 is limited depends on the use, the exhaust conditions, May be determined as appropriate.

  Further, the deformation of the central wind shield member 18 allows the opening area Ae of the exhaust port 2 to be freely adjusted, thereby limiting the degree of restriction of the exhaust port area Ae by the central wind shield member 18 depending on the use conditions and the like. It may be possible to adjust.

  Alternatively, a structure in which the position and posture of the central wind shielding member 18 at the exhaust port 2 can be freely adjusted, and the suction mode of the exhaust gases R and G can be adjusted according to the use conditions by adjusting the position and posture. It may be.

  The specific shape structure of the central wind shielding member 18 is not limited to the shape structure shown in the above-described embodiment, and various modifications are possible. In some cases, the central wind shielding member 18 is substantially parallel to the opening surface of the exhaust port 2. A flat plate member, a flat plate member inclined with respect to the opening surface of the exhaust port 2, or a flat plate member whose posture can be freely adjusted may be used.

  The ratio between the gas suction air volume Qe from the exhaust port 2 and the auxiliary gas ejection air volume Qs from the auxiliary outlet 11, or the ratio between the gas suction air speed Ve at the exhaust port 2 and the auxiliary gas ejection wind speed Vs from the auxiliary outlet 11. May be adjusted as appropriate, and by adjusting these ratios, the suction mode of the exhaust target gases R and G may be adjusted according to the use conditions.

  The exhaust device with an auxiliary jet port according to the present invention can be used in various fields where exhaust of various gases is required.

DESCRIPTION OF SYMBOLS 1 Exhaust object area R Area | region gas 2 Exhaust port S Auxiliary gas 11 Auxiliary outlet H Exhaust device Ae Exhaust port area 18 Central windshield member 18b The part of the central windshield member toward the exhaust target area 18d Exhaust of central windshield member Portion toward back of mouth 19 Exhaust hood 20 Unit base Fe Exhaust fan Fs Auxiliary gas fan

Claims (6)

In addition to forming an exhaust port for sucking in the gas in the exhaust target region while being opened to the exhaust target region, the auxiliary gas is introduced into the exhaust target region from the vicinity of the periphery of the exhaust port in a direction along the opening surface of the exhaust port. An exhaust device with an auxiliary jet port provided with an auxiliary jet port for jetting outward the exhaust port,
An exhaust device with an auxiliary jet port provided with a central wind-shielding member that is partially located in a central portion of the exhaust port and restricts an exhaust port area with respect to an exhaust target area.   The exhaust device with an auxiliary jet port according to claim 1, wherein a shape of a portion of the central wind-shielding member toward the exhaust target area is a cone-shaped or hemispherical pointed shape.   The shape of the portion of the central windshield member facing the exhaust port back side is a shape that extends to the exhaust port deep side longer than the maximum thickness dimension of the central wind shield member in a state where the cross-sectional area gradually decreases toward the exhaust port back side. The exhaust device with an auxiliary jet outlet according to claim 1 or 2.   The exhaust hood having a shape that expands from the exhaust port toward the side of the exhaust target area is provided, and the auxiliary jet port is disposed at a peripheral edge of the tip of the exhaust hood. Exhaust device with auxiliary spout.   The auxiliary gas ejection direction of the auxiliary ejection port is inclined to the upstream side in the flow direction of the suction gas into the exhaust port with respect to the opening surface direction of the exhaust port. Exhaust device with auxiliary spout. An exhaust unit using the exhaust device with an auxiliary jet port according to any one of claims 1 to 4,
An exhaust device with an auxiliary injection port provided with the exhaust port, the auxiliary injection port, and the central wind-shielding member protrudes from the unit base, and an auxiliary gas is discharged from the exhaust fan and the auxiliary injection port for sucking gas from the exhaust port An exhaust unit having an auxiliary gas fan mounted on the unit base.

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