Suction duct

Abstract

To provide a suction duct which makes a wall surface of a duct less likely to get dirty.SOLUTION: A suction duct 100 includes: a duct member; and an inner pipe 30 having an inlet into which smoke flows and an outlet from which smoke flows out, the inner pipe 30 removably disposed in the duct member.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to a suction duct that can be used in a top-draw exhaust system. [Background technology]

[0002] A top exhaust device is known that is disposed above a cooking appliance and sucks in and exhausts smoke rising from the cooking appliance. The top exhaust device includes a duct member that extends in the vertical direction and through which the smoke flows.

[0003] Patent document 1 discloses a smoke exhaust or exhaust device characterized in that a hanging pipe is divided into upper and lower parts, the lower pipe is fitted into the upper pipe so that it can slide vertically, the lower pipe is biased upward by an elastic member, a lower pipe fixing means is provided for fixing the vertical position of the lower pipe, and the height of the lower end suction port of the lower pipe is adjustable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-139105 A Summary of the Invention [Problem to be solved by the invention]

[0005] Oil contained in smoke adheres to the inner surface of the duct member. If the oil is left on the inner surface of the duct member, it may ignite and cause a fire. Therefore, the duct member needs to be cleaned periodically. However, since the duct member is connected to other parts, it is difficult to remove, and cleaning the inner surface of the duct member is time-consuming.

[0006] An object of the present invention is to provide a suction duct in which the inner surface of the duct member is less likely to become dirty. [Means for solving the problem]

[0007] The present application provides the following aspects of the invention. (Item 1) A suction duct for a top exhaust device, comprising: A duct member; an inner pipe having an inlet through which smoke flows and an outlet through which smoke flows out, the inner pipe being removably disposed within the duct member; A suction duct comprising:

[0008] (Item 2) Further comprising an exhaust gas suction tube; The exhaust gas suction tube is attached to a lower portion of the inner pipe. 2. A suction duct according to item 1.

[0009] (Item 3) The exhaust gas suction tube is connected to a lower part of the inner pipe by a screw. 2. A suction duct as described in item 2.

[0010] (Item 4) The duct member has an inverted L-shaped groove, The exhaust gas suction tube has a protrusion, The protrusion is inserted into the groove, whereby the exhaust gas suction tube is attached to the duct member. 4. A suction duct according to item 2 or 3.

[0011] (Item 5) The inner diameter of the lower portion of the inner pipe is larger than the outer diameter of the upper portion of the inner pipe. 5. A suction duct according to any one of items 1 to 4.

[0012] (Item 6) the lower and upper portions of the inner pipe are cylindrical; The inner pipe includes a tapered portion between the lower portion and the upper portion, the tapered portion having a diameter that decreases from the lower portion toward the upper portion. 6. A suction duct according to any one of items 1 to 5.

[0013] (Item 7) The duct member is A fixed duct member; a lifting duct member that is slidable up and down relative to the fixed duct member and can be fixed to the fixed duct member, and into which the fixed duct member can be inserted; Equipped with The inner pipe is disposed within the lift-and-lower duct member and is vertically slidable together with the lift-and-lower duct member. 7. A suction duct according to any one of items 1 to 6.

[0014] (Item 8) When the lift-up duct member is at the lowest position, the outlet of the inner pipe is inserted into the fixed duct member. 8. A suction duct according to item 7.

[0015] (Item 9) When the lift-up duct member is slid to the uppermost position, an upper portion of the inner pipe overlaps with the fixed duct member. 9. A suction duct according to item 7 or 8. Effect of the Invention

[0016] Since the suction duct of the present invention has an inner pipe disposed inside the duct member, at least a part of the smoke drawn in, preferably almost all of the smoke, flows through the inner pipe. This reduces the amount of smoke flowing along the inner surface of the duct member, thereby reducing dirt adhering to the inner surface of the duct member. In addition, since the inner pipe can be removed from the duct member, it can be easily cleaned. [Brief description of the drawings]

[0017] [Figure 1A] FIG. 2 is a front view of a top-drawing exhaust device including a suction duct when the lifting duct member is in the lowest position. [Figure 1B]4 is a vertical cross-sectional view of the suction duct when the lifting duct member is in the lowest position. FIG. [Figure 2A] FIG. 2 is a front view of a top evacuation device including a suction duct when the lifting duct member is in the uppermost position. [Figure 2B] FIG. 4 is a vertical cross-sectional view of the suction duct when the lifting duct member is in the uppermost position. [Diagram 3] FIG. [Figure 4] 13 is a perspective view showing a state in which a fixed duct member and a lifting duct member are connected by a fixing means. FIG. [Diagram 5] FIG. [Figure 6] FIG. 4 is a perspective view showing a connection state between an inner pipe and an exhaust gas suction cylinder. [Figure 7] 13 is a front view showing a connection state between the lifting duct member and the exhaust gas suction tube. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The suction duct 100 of the present invention will be described with reference to the drawings. For convenience of explanation, the following description will be given assuming that the up-down direction in FIG. 1A is the up-down direction of the suction duct 100.

[0019] <1. Overall structure of the suction duct> As shown in FIG. 1A, the suction duct 100 of the present invention constitutes a part of an upward exhaust device 1000. The upward exhaust device 1000 is a device disposed above a cooking device for exhausting smoke rising from the cooking device. The cooking device is, for example, a roaster for yakiniku or a cooker for hot pot cooking. The upward exhaust device 1000 includes the suction duct 100 of the present invention and a filter box 200 in which a filter is housed. The suction duct 100 is disposed directly above the cooking device and guides the sucked smoke toward the filter.

[0020] As shown in FIGS. 1A, 1B and 3, the suction duct 100 mainly includes a fixed duct member 10, a lifting duct member 20, an inner pipe 30, a fixing means 40, and an exhaust gas suction cylinder 50.

[0021] The fixed duct member 10 is connected to a filter box 200 of the top exhaust device 1000 .

[0022] The lifting / lowering duct member 20 is disposed concentrically with and below the fixed duct member 10, and is releasably connected to the fixed duct member 10 via a fixing means 40. The lifting / lowering duct member 20 is telescopically slidable relative to the fixed duct member 10 between a lowest position (see FIG. 1A) and an uppermost position (see FIG. 2A).

[0023] The inner pipe 30 is disposed concentrically with the lift-and-lower duct member 20 and inside the lift-and-lower duct member 20 .

[0024] The exhaust gas suction cylinder 50 is disposed below and concentric with the lift-up duct member 20 and the inner pipe 30. The exhaust gas suction cylinder 50 is connected (preferably detachably connected) to each of the lift-up duct member 20 and the inner pipe 30. Smoke rising from the cooking appliance is sucked in through the exhaust gas suction cylinder 50 and flows into the inner pipe 30.

[0025] 1B and 2B, when the lift-up duct member 20 is lifted up or down, the inner pipe 30 and the exhaust gas suction cylinder 50 are lifted up or down together. When the lift-up duct member 20 is at the uppermost position, most of the inner pipe 30 is inserted inside the fixed duct member 10.

[0026] Each of the components of the suction duct 100 will now be described in detail.

[0027] <1-1. Fixed duct components> As shown in Figs. 1A and 3, the fixed duct member 10 is made of a cylindrical pipe extending in the vertical direction, and is made of, for example, a metal material.

[0028] <1-2. Lifting duct parts> 1A, 1B and 3, the lift duct member 20 is made of a cylindrical pipe extending in the vertical direction and is made of, for example, a metal material. The inner diameter of the lift duct member 20 is larger than the outer diameter of the fixed duct member 10.

[0029] As shown in FIG. 3, an inverted L-shaped groove 21 is provided at the lower part of the lifting / lowering duct member 20. In this embodiment, a plurality of grooves 21 (three grooves 21) are provided at a distance from each other in the circumferential direction of the lifting / lowering duct member 20. As described later, a protrusion 54 of the exhaust gas suction tube 50 is inserted into each groove 21 (see FIG. 7). Each groove 21 includes a first groove portion 21a, a second groove portion 21b, and a third groove portion 21c. The first groove portion 21a opens at the lower end of the lifting / lowering duct member 20 and extends upward from the lower end of the lifting / lowering duct member 20. The second groove portion 21b is connected to the first groove portion 21a and extends from the first groove portion 21a in the circumferential direction of the lifting / lowering duct member 20. The third groove portion 21c is connected to the second groove portion 21b, extends downward from the second groove portion 21b, and terminates above the lower end of the lift-down duct member 20.

[0030] <1-3. Inner pipe> 1B and 3, the inner pipe 30 includes a cylindrical lower tube portion 31, a cylindrical upper tube portion 32, and a tapered portion 33 provided between the lower tube portion 31 and the upper tube portion 32. The inner diameter of the lower tube portion 31 is larger than the outer diameter of the upper tube portion 32. Therefore, the inner diameter of the lower tube portion 31 is naturally larger than the inner diameter of the upper tube portion 32. The tapered portion 33 gradually narrows in diameter from the lower tube portion 31 toward the upper tube portion 32.

[0031] The inner pipe 30 is made of, for example, a metal material. Considering that the inner pipe 30 is raised and lowered together with the lift-and-lower duct member 20 and is removed from the lift-and-lower duct member 20, the inner pipe 30 is preferably made of aluminum or an aluminum alloy in order to reduce weight.

[0032] 3, the lower cylindrical portion 31 has through holes 31a for inserting screws 60 (see FIG. 6). In this embodiment, a plurality of through holes 31a (three through holes 31a) are provided spaced apart from one another in the circumferential direction of the lower cylindrical portion 31. As will be described later, the lower cylindrical portion 31 is fixed to the exhaust gas suction cylinder 50 by the screws 60 (see FIG. 6).

[0033] 1B, a gap S1 large enough to allow the fixed duct member 10 and a rail 41 (described later) to be inserted is provided between the outer surface of the upper cylinder portion 32 and the inner surface of the lifting / lowering duct member 20. When the lifting / lowering duct member 20 is at the lowest position, only the lower part of the fixed duct member 10 is inserted into the gap S1, and the lower part of the fixed duct member 10 and the upper part of the lifting / lowering duct member 20 overlap. Also, only the upper part of the upper cylinder portion 32 is inserted into the fixed duct member 10.

[0034] 2B, when the lifting duct member 20 is at the uppermost position, the fixed duct member 10 is inserted into the gap S1 over substantially its entire length. Also, the entire length of the upper cylinder portion 32 and the upper portion of the tapered portion 33 are inserted into the fixed duct member 10, while the lower portion of the tapered portion 33 and the lower cylinder portion 31 are not inserted into the fixed duct member 10 and are located outside the fixed duct member 10.

[0035] <1-4. Fixing means> The fixing means 40 is a means for detachably fixing the lifting / lowering duct member 20 to the fixed duct member 10. As shown in Figures 3 and 4, the fixing means 40 includes a pair of rails 41 arranged symmetrically on the outer surface of the fixed duct member 10, and a pair of engaging members 42 arranged symmetrically on the lifting / lowering duct member 20 and engaging with each of the rails 41.

[0036] Each rail 41 extends over the entire vertical length of the fixed duct member 10. Each rail 41 has a plurality of openings spaced apart in the vertical direction. Each engagement member 42 includes a hook that engages with the edge of the opening of the rail 41 and a lever, and is rotatably attached to the lifting duct member 20.

[0037] By sliding the lifting duct member 20 up and down and rotating the lever to hook the hook of the engagement member 42 onto the edge of the opening of the rail 41, the lifting duct member 20 can be fixed to the fixed duct member 10 at a predetermined position.

[0038] <1-5. Exhaust gas suction tube> 1B and 5, the exhaust gas suction cylinder 50 includes a main body 51, a bottom wall 52, a peripheral wall 53, and a protrusion 54. The exhaust gas suction cylinder 50 is made of, for example, a metal material.

[0039] Main body 51 is hollow to allow smoke to flow through it, and includes suction section 511 that expands like a trumpet, intermediate section 512 that extends upward from suction section 511 while gradually reducing in diameter, and attachment section 513 that extends upward from the upper end of intermediate section 512.

[0040] The mounting portion 513 is cylindrical. The outer diameter of the mounting portion 513 is smaller than the inner diameter of the lower tubular portion 31 of the inner pipe 30. Therefore, the mounting portion 513 can be inserted into the lower tubular portion 31. The mounting portion 513 has a screw hole 513a. An internal thread is provided on the inner circumferential surface of the screw hole 513a. In this embodiment, a plurality of screw holes 513a (three screw holes 513a) are provided at intervals from each other in the circumferential direction of the mounting portion 513.

[0041] 6, the exhaust gas suction tube 50 is fixed to the inner pipe 30 by inserting the mounting part 513 into the lower tube part 31, aligning the screw hole 513a of the mounting part 513 with the through hole 31a of the lower tube part 31, inserting a screw 60 into the holes 513a, 31a, and tightening the screw 60. Smoke rising from the cooking appliance is sucked in through the suction part 511, passes through the middle part 512, exits from the mounting part 513, and flows into the inner pipe 30.

[0042] 1B and 5, the bottom wall 52 has a doughnut shape extending horizontally radially outward from the outer surface of the intermediate portion 512. The peripheral wall 53 has a cylindrical shape extending upward from the radially outer end of the bottom wall 52, and is located radially outward from the mounting portion 513. The inner diameter of the peripheral wall 53 is larger than the outer diameter of the lifting duct member 20.

[0043] The protrusions 54 are formed integrally with the peripheral wall 53 and extend radially inward from the inner surface of the peripheral wall 53. The protrusions 54 are, for example, cylindrical pins. In this embodiment, a plurality of the protrusions 54 (three protrusions 54) are provided on the peripheral wall 53 at intervals from each other in the circumferential direction.

[0044] As shown in Fig. 7, when connecting the lifting duct member 20 and the exhaust gas suction tube 50, first, the lifting duct member 20 is placed inside the peripheral wall 53 so that the protrusion 54 is inserted into the first groove portion 21a of the lifting duct member 20. Next, the exhaust gas suction tube 50 is rotated. As a result, the protrusion 54 passes through the second groove portion 21b and fits into the third groove portion 21c. Note that in Fig. 7, a part of the peripheral wall 53 is omitted in order to clearly show the state in which the protrusion 54 is placed in the groove 21.

[0045] Smoke sucked in from the exhaust gas suction cylinder 50 passes through the inner pipe 30 and flows into the fixed duct member 10. By connecting the exhaust gas suction cylinder 50 to the lift-up duct member 20 and the inner pipe 30, the inner pipe 30 and the exhaust gas suction cylinder 50 can slide up and down together with the lift-up duct member 20.

[0046] Since the inner diameter of the peripheral wall 53 is larger than the outer diameter of the lift-down duct member 20, as shown in FIG. 7, a gap S2 exists between the inner surface of the peripheral wall 53 and the outer surface of the lift-down duct member 20. In addition, the lower end of the lift-down duct member 20 is located above the upper surface of the bottom wall 52, and a gap S3 exists between the lower end of the lift-down duct member 20 and the upper surface of the bottom wall 52. When the upward drawing exhaust device 1000 is used, outside air is sucked in from the gap S2. The outside air sucked in from the gap S2 passes through the gap S3 and flows into the gap S1, and rises along the inner surface of the lift-down duct member 20. Therefore, even if smoke flows into the gap S1, the sucked in outside air can prevent the smoke from coming into contact with the inner surface of the lift-down duct member 20.

[0047] <2. Features> As shown in FIG. 1B, the lifting / lowering duct member 20 is connected to the fixed duct member 10 via the fixing means 40, so that it takes time to remove the lifting / lowering duct member 20. Therefore, by disposing the inner pipe 30 in the lifting / lowering duct member 20, at least a part of the smoke sucked in, preferably almost all of the smoke, flows through the inner pipe 30, so that the amount of smoke flowing along the inner surface of the lifting / lowering duct member 20 can be reduced. Therefore, the dirt adhering to the inner surface of the lifting / lowering duct member 20 can be reduced over the length of the inner pipe 30. The inner pipe 30 can be removed from the lifting / lowering duct member 20, so that it can be easily washed. By reducing the dirt on the inner surface of the lifting / lowering duct member 20, the dirt adhering to the outer surface of the fixed duct member 10 when the lifting / lowering duct member 20 is raised can also be reduced. In addition, since most of the oil contained in the smoke adheres to the inner surface of the inner pipe 30, the amount of oil contained in the smoke flowing into the fixed duct member 10 is reduced. Therefore, the dirt adhering to the inner surface of the fixed duct member 10 can also be reduced.

[0048] 1B, when the lift-down duct member 20 is at the lowest position, the outlet of the inner pipe 30 (the upper end of the upper cylinder portion 32) is inserted into the fixed duct member 10, so that the smoke discharged from the inner pipe 30 does not come into contact with the inner surface of the lift-down duct member 20. This makes it possible to reduce dirt adhering to the inner surface of the lift-down duct member 20.

[0049] As shown in Fig. 1B, by making the outer diameter of the upper cylinder portion 32 of the inner pipe 30 smaller than the outer diameter of the lower cylinder portion 31, a gap S1 into which the fixed duct member 10 can be inserted can be provided between the outer surface of the upper cylinder portion 32 and the inner surface of the lift-up duct member 20. Then, as shown in Fig. 2B, when the lift-up duct member 20 is raised to the uppermost position, the upper cylinder portion 32 can overlap with the fixed duct member 10 over its entire length in the up-down direction. In this way, by providing the gap S1 into which the fixed duct member 10 can be inserted, the lift-up duct member 20 and the inner pipe 30 do not interfere with the fixed duct member 10 when the lift-up duct member 20 is raised and lowered, so that the lift-up duct member 20 and the inner pipe 30 can be raised and lowered smoothly.

[0050] As shown in FIG. 1B, by making the inner diameter of the lower cylindrical portion 31 of the inner pipe 30 larger than the inner diameter of the upper cylindrical portion 32, smoke can be sucked over a wide range.

[0051] As shown in FIG. 1B, the connection portion between the lower tubular portion 31 and the upper tubular portion 32 is formed as a tapered portion 33 that gradually reduces in diameter toward the top, thereby making the air flow inside the inner pipe 30 smoother.

[0052] As shown in FIG. 1B, the suction duct 100 is provided with an exhaust gas suction tube 50, so that smoke can be efficiently sucked in.

[0053] 1B, because the exhaust gas suction cylinder 50 is connected to the inner pipe 30, the inner pipe 30 and the exhaust gas suction cylinder 50 can be removed together from the lift-and-lower duct member 20 when cleaning the suction duct 100. This reduces the effort required to clean the inner pipe 30 and the exhaust gas suction cylinder 50. In addition, because the exhaust gas suction cylinder 50 is detachably connected to the inner pipe 30, the exhaust gas suction cylinder 50 and the inner pipe 30 can be washed separately, making it easier to wash the exhaust gas suction cylinder 50 and the inner pipe 30.

[0054] As shown in Fig. 6, the exhaust gas suction cylinder 50 is attached to the inner pipe 30 by the screw 60, so that the exhaust gas suction cylinder 50 can be prevented from coming off the inner pipe 30 when the lifting duct member 20 is lifted and lowered. In addition, when removing the exhaust gas suction cylinder 50 and the inner pipe 30 from the lifting duct member 20, the inner pipe 30 and the exhaust gas suction cylinder 50 do not suddenly separate, and one of them does not fall and break. In addition, when cleaning, the exhaust gas suction cylinder 50 and the inner pipe 30 can be separated by removing the screw 60, so that the exhaust gas suction cylinder 50 and the inner pipe 30 can be easily washed.

[0055] 6, by inserting the mounting part 513 of the exhaust gas suction tube 50 into the inner pipe 30, all the smoke discharged from the exhaust gas suction tube 50 flows into the inner pipe 30. Therefore, almost no or no smoke flows into the gap S1 between the outer surface of the inner pipe 30 and the inner surface of the lift-down duct member 20, so that dirt adhering to the inner surface of the lift-down duct member 20 can be reduced.

[0056] As shown in Figure 7, by inserting the protrusion 54 into the inverted L-shaped groove 21 of the lifting and lowering duct member 20, the exhaust gas suction tube 50 can be connected to the lifting and lowering duct member 20, and the exhaust gas suction tube 50 can be easily removed from the lifting and lowering duct member 20.

[0057] 7, the groove 21 has the third groove portion 21c extending downward from the second groove portion 21b, so that once the protrusion 54 is disposed in the third groove portion 21c, the lifting / lowering duct member 20 and the exhaust gas suction tube 50 cannot rotate relative to each other. This makes it possible to prevent the exhaust gas suction tube 50 from coming off the lifting / lowering duct member 20 when the upward evacuation device 1000 is in use.

[0058] <3. Modifications> The present invention is not limited to the above embodiment, and various modifications are possible without departing from the scope of the present invention. Modifications of the present invention will be described below. The modifications described below can be applied to the above embodiment alone or in appropriate combination without departing from the scope of the present invention.

[0059] (1) The suction duct 100 does not need to include the exhaust gas suction tube 50. In this case, for example, a cylindrical protrusion extending radially outward is provided on the outer surface of the inner pipe 30, and the protrusion is inserted into the groove 21 of the lift-down duct member 20 in the same manner as the protrusion 54, thereby connecting the inner pipe 30 to the lift-down duct member 20. Even if the suction duct 100 does not include the exhaust gas suction tube 50, as long as the inner pipe 30 is inserted into the lift-down duct member 20, at least a part of the smoke flows through the inner pipe 30, so that the amount of smoke flowing along the inner surface of the lift-down duct member 20 can be reduced, and therefore, the dirt adhering to the inner surface of the lift-down duct member 20 can be reduced.

[0060] (2) The suction duct 100 may not include the lifting duct member 20. In this embodiment, the duct member is composed of only the fixed duct member 10, and the duct member does not expand or contract in the vertical direction. The inner pipe 30 is disposed inside the fixed duct member 10. The exhaust gas suction tube 50 can be detachably connected to the fixed duct member 10, for example, by providing a groove having a structure similar to that of the groove 21 in the lower part of the fixed duct member 10 and inserting the protrusion 54 into the groove. Since the inner pipe 30 is disposed inside the fixed duct member 10, at least a part of the smoke sucked in, preferably almost all of the smoke, flows inside the inner pipe 30, so that the amount of smoke flowing along the inner surface of the fixed duct member 10 can be reduced. This can reduce dirt adhering to the inner surface of the fixed duct member 10. The inner pipe 30 can be removed from the fixed duct member 10, so that it can be easily washed.

[0061] (3) The suction duct 100 may not include the lifting duct member 20 and the exhaust gas suction tube 50. In this embodiment, the duct member is composed of only the fixed duct member 10, and the duct member does not expand or contract in the vertical direction. The inner pipe 30 can be arranged in the fixed duct member 10 and connected to the fixed duct member 10. For example, a groove having a structure similar to that of the groove 21 is provided in the lower part of the fixed duct member 10, and a cylindrical protrusion extending radially outward is provided on the outer surface of the inner pipe 30, and the protrusion is inserted into the groove in the lower part of the fixed duct member 10 in the same manner as the protrusion 54, thereby making it possible to detachably connect the inner pipe 30 to the fixed duct member 10. Since the inner pipe 30 is arranged in the fixed duct member 10, at least a part of the sucked smoke, preferably almost all of the smoke, flows through the inner pipe 30, and the amount of smoke flowing along the inner surface of the fixed duct member 10 can be reduced. This can reduce dirt adhering to the inner surface of the fixed duct member 10. The inner pipe 30 can be removed from the fixed duct member 10 and can therefore be easily cleaned.

[0062] (4) The inner pipe 30 may be a straight pipe (cylindrical pipe) having the same outer diameter and the same inner diameter over the entire length in the vertical direction.

[0063] (5) When the lift-up duct member 20 is lifted to the uppermost position, the inner pipe 30 may be inserted into the fixed duct member 10 over its entire vertical length.

[0064] (6) The connection between the inner pipe 30 and the exhaust gas suction cylinder 50 is not limited to the connection using the screw 60, and for example, a pin may be used instead of the screw 60. Alternatively, the lower tube portion 31 of the inner pipe 30 may simply be placed over the mounting portion 513 of the exhaust gas suction cylinder 50 without using a connecting member such as the screw 60 or pin.

[0065] (7) The inner pipe 30 and the exhaust gas suction tube 50 may be integrally formed inseparably by, for example, welding.

[0066] (8) Each protrusion 54 does not have to be formed integrally with the peripheral wall 53 and may be detachable from the peripheral wall 53 . [Explanation of symbols]

[0067] 100 Suction duct 10 Fixed duct components (duct components) 20 Lifting duct components (duct components) 21 Groove 30 Inner pipe 31 Lower tube portion (lower part of the inner pipe) 32 Upper cylinder section (upper part of the inner pipe) 33 Tapered section 50 Exhaust gas suction tube 54 Protrusion 60 Screws 1000 Top exhaust device

Claims

1. A suction duct for a top exhaust device, A duct member; a tubular inner pipe having an inlet at a lower portion through which smoke flows in and an outlet at an upper portion through which smoke flows out, the inner pipe being detachably disposed within the duct member; A suction duct comprising:

2. Further provided with an exhaust gas suction tube, The exhaust gas suction tube is attached to a lower portion of the inner pipe.

2. The suction duct according to claim 1.

3. The exhaust gas suction tube is connected to a lower portion of the inner pipe by a screw. A suction duct according to claim 2.

4. The exhaust gas suction tube has a protrusion, the duct member has a notch into which the protrusion is inserted, The notch includes a first groove portion extending upward from a lower end of the duct member, a second groove portion extending circumferentially from the first groove portion, and a third groove portion extending downward from the second groove portion and terminating above the lower end of the duct member. A suction duct according to claim 2 or 3.

5. Smoke sucked from the exhaust gas suction tube flows into the inlet of the inner pipe, and outside air flows into the outside of the inlet of the inner pipe from the gap between the duct member and the exhaust gas suction tube.

3. A suction duct according to claim 1 or 2.

6. The duct member is A fixed duct member; an elevating duct member that is slidable up and down relative to the fixed duct member and can be fixed to the fixed duct member, and into which the fixed duct member can be inserted; Equipped with The inner pipe is disposed within the lifting duct member and is slidable up and down together with the lifting duct member.

3. A suction duct according to claim 1 or 2.

7. When the lifting duct member is at its lowest position, the outlet of the inner pipe is inserted into the fixed duct member. A suction duct according to claim 6.

8. When the lifting duct member is slid to the uppermost position, an upper portion of the inner pipe overlaps with the fixed duct member. A suction duct according to claim 6.

9. A suction duct for an upward exhaust device, A duct member; Equipped with an exhaust gas suction tube, The exhaust gas suction tube has a protrusion, the duct member has a notch into which the protrusion is inserted, The notch includes a first groove portion extending upward from a lower end of the duct member, a second groove portion extending circumferentially from the first groove portion, and a third groove portion extending downward from the second groove portion and terminating above the lower end of the duct member. A suction duct comprising:

Images