Dough fermentation device for moon cake production

Abstract

The invention relates to the field of dough fermentation, in particular to a dough fermentation device for moon cake production. An existing fermentation device is inconvenient to clean due to an integrated box body, so that uncleaned stains can pollute dough, the dough is easily polluted again when the fermentation degree of the dough is monitored, and the fermentation degree of the dough is not comprehensively monitored. The invention discloses a dough fermentation device for moon cake production. The dough fermentation device comprises two bottom plates and the like, the two bottom plates are in contact with each other, two universal wheels are fixedly connected to the lower part of each bottom plate, half box bodies are fixedly connected to the two bottom plates, a plurality of air holes are formed in the upper parts of the half box bodies, the two half box bodies are in contact with each other, and a door plate is connected to each half box body through a hinge. The two half box bodies and the placing disc are separated, so that the cleaning is more convenient, and the dough fermentation quality is not easily influenced due to incomplete cleaning of the interiors of the placing disc and the half box bodies.

Description

Technical Field

[0001] The invention relates to the field of dough fermentation, in particular to a dough fermentation device for moon cake production. Background Art

[0002] In the process of making mooncakes, such as Su-style mooncakes, the dough fermentation step is involved. After the dough for making mooncakes is kneaded and yeast is added, the dough needs to be left to ferment. The existing fermentation box can provide a relatively closed and stable environment for dough fermentation.

[0003] However, the existing fermentation device is not convenient to clean due to the integrated box, so that the stains that are not cleaned will contaminate the dough, which is easy to contaminate the dough again when monitoring the fermentation degree of the dough, and the monitoring of the fermentation degree of the dough is not comprehensive enough. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention provides a dough fermentation device for mooncake production, which is easy to clean, easy to monitor the dough fermentation progress without contaminating the dough, and can monitor more comprehensively.

[0005] The technical solution is: a dough fermentation device for mooncake production, including two bottom plates, the two bottom plates are in contact, two universal wheels are fixedly connected to the lower parts of the two bottom plates, half boxes are fixedly connected to the two bottom plates, a plurality of air holes are opened on the upper parts of the half boxes, the two half boxes are in contact, each half box is connected to a door panel through a hinge, each door panel has a square hole, a transparent glass panel is fixedly connected in the square hole on each door panel, a water basin is placed on each bottom plate, magnet sheets are fixedly connected to the two door panels, the two magnet sheets are in contact with each other, an opening and closing mechanism is arranged outside the two half boxes, the opening and closing mechanism is used to separate the two half boxes for cleaning, a placing mechanism is arranged inside the two half boxes, the placing mechanism is used to place the fermented dough.

[0006] As a further preferred scheme, the opening and closing mechanism includes two limit arms, the two limit arms are respectively fixedly connected to one side of the two half-boxes, a rotating shaft is rotatably connected between the two limit arms, and the upper parts of the two half-boxes are fixedly connected with opening and closing handles, one of the half-boxes is fixedly connected to a limit plate on the upper part, and a groove is provided on the limit plate, and the other half-box is fixedly connected to a bent rod on the upper part, and a clamping rod is slidably connected to the bent rod, a pressure spring is connected between the clamping rod and the bent rod, and the lower part of the clamping rod is located in the groove on the limit plate.

[0007] As a further preferred scheme, the placement mechanism includes a plurality of magnetic rods, each of the magnetic rods is fixedly connected to the rotating shaft, a plurality of placement plates are fixedly connected to the inner wall of each half box, two of the placement plates on the same horizontal line form a group, a guide plate is fixedly connected to the inner wall of each half box, two of the guide plates on the same horizontal line form a group, straight grooves are opened on the guide plates, a placement disk is placed between the two placement plates in each group, a placement groove is opened in the middle of the placement disk, and grid lines are provided on the bottom surface of the placement groove of the placement disk, each of the placement disks is fixedly connected to a magnet block on one side close to the magnetic rod, the magnet block is in contact with the magnetic rod, each of the placement disks is rotatably connected to a rotating rod on both sides, a torsion spring is connected between the rotating rod and the placement disk, one side of the rotating rod is located in the straight groove of the guide plate, and each of the placement disks is fixedly connected to a clamping block on both sides, and the clamping block is in contact with the side of the rotating rod away from the guide plate.

[0008] As a further preferred scheme, it also includes an observation mechanism, which is arranged on the two half-boxes, and the observation mechanism is used to observe and detect the degree of dough fermentation. The observation mechanism includes two isolation covers, and the two isolation covers are respectively fixedly connected to the outer walls of the two half-boxes, and a plurality of vertical rods are fixedly connected to the inner walls of the two half-boxes. The two vertical rods form a group, and a sliding long rod is slidably connected between the two vertical rods of each group. A plurality of round rod racks are fixedly connected to one side of each sliding long rod, and a connecting frame is fixedly connected to the side of each sliding long rod away from the round rod rack, and the connecting frame passes through the half-boxes, and straight rods are fixedly connected between all the connecting frames located on the same side of the half-box, and the straight rods pass through the isolation covers, and a reset spring is connected between the isolation covers and the straight rods, and a pull rod is fixedly connected to the upper part of each straight rod.

[0009] As a further preferred embodiment, it also includes an air outlet mechanism, which is arranged on the door panel, and is used to extract a part of the gas in the half box. The air outlet mechanism includes a piston tank, which is fixedly connected to one of the door panels, and a piston push rod is slidably connected to the piston tank, and a return spring is connected between the piston push rod and the piston tank, and the upper part of the piston push rod is in contact with the lower part of one of the pull rods, and an air outlet elbow is fixedly connected to the bottom of the piston tank, and a conical cover is fixedly connected to the upper part of the air outlet elbow, and a connecting short tube is fixedly connected to the upper part of the door panel, and the connecting short tube passes through the door panel, one end of the connecting short tube is connected to the air outlet elbow, and the end of the connecting short tube away from the air outlet elbow is fixedly connected to a one-way valve.

[0010] The present invention has the following advantages: 1. The two half boxes and the placement tray are separated, making cleaning more convenient and preventing the quality of dough fermentation from being affected by incomplete cleaning of the placement tray and the interior of the half boxes.

[0011] 2. The downward movement of the pull rod will drive the straight rod to move downward, and the downward movement of the straight rod will drive the connecting frame to move downward together, and the downward movement of the connecting frame will drive the sliding long rod and the round rod frame to move downward together. After the round rod frame moves downward for a distance, it will squeeze and poke the upper surface of the dough placed in the placement tray for fermentation, and then the operator releases the pull rod, and the reset spring drives the pull rod and the straight rod to move upward and reset, and then drives the round rod frame to move upward and reset, and then a depression will appear on the upper surface of the dough poked by the round rod frame, and the operator observes the rebound speed of the depression on the dough surface through the transparent glass plate on the door panel, and evaluates the degree of dough fermentation by observing the rebound speed of the depression on the dough surface. In this way, it is easier for the operator to monitor the degree of dough fermentation without direct contact with the dough, so that the dough is not easily contaminated during the fermentation process.

[0012] 3. When the operator pushes the pull rod to move downward, the downward movement of the pull rod will squeeze the piston push rod downward, the return spring is compressed, and the downward movement of the piston push rod will squeeze out the air in the piston tank through the air outlet elbow. When the air in the piston tank flows out through the air outlet elbow, part of the air in the half box will be sucked out through the connecting short pipe and the one-way valve under the principle of siphon and discharged together through the air outlet elbow. The exhausted gas can be diffused through the cone hood, and then the operator can smell the smell of part of the air extracted from the half box at the cone hood, and then judge whether there is a problem with the dough fermentation by identifying the smell of this part of the air, which makes the monitoring of the dough fermentation degree more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the separated three-dimensional structure of the limiting plate, the bending rod and the clamping rod of the present invention.

[0015] Figure 3 It is a partial three-dimensional structural schematic diagram of the opening and closing mechanism of the present invention.

[0016] Figure 4 It is a partial three-dimensional structural schematic diagram of the placement mechanism of the present invention.

[0017] Figure 5 It is a three-dimensional structural schematic diagram of the placement mechanism of the present invention.

[0018] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged three-dimensional structure at point A in the middle.

[0019] Figure 7 It is a three-dimensional structural schematic diagram of the placement mechanism and the opening and closing mechanism of the present invention.

[0020] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure of the half box of the present invention.

[0021] Fig. 9 It is a partial three-dimensional structural schematic diagram of the observation mechanism of the present invention.

[0022] Fig.10 It is a schematic diagram of the cross-sectional three-dimensional structure of the isolation cover of the present invention.

[0023] Fig.11 It is a three-dimensional structural schematic diagram of the round rod frame, the connecting frame and the half box of the present invention.

[0024] Fig.12 It is a schematic diagram of the three-dimensional structure of the air outlet mechanism of the present invention.

[0025] Fig.13 It is a schematic diagram of the cross-sectional three-dimensional structure of the door panel and the transparent glass panel of the present invention.

[0026] Among them: 1-bottom plate, 2-universal wheel, 3-half box, 41-door panel, 42-transparent glass plate, 43-water basin, 44-magnet sheet, 51-limiting arm, 52-rotating shaft, 53-opening and closing handle, 54-limiting plate, 55-bent rod, 56-clamping rod, 57-pressure spring, 61-magnetic rod, 62-placing plate, 63-guide plate, 64-placing plate, 65-magnet block, 66-rotating rod, 67-torsion spring, 68-clamping block, 71-isolation cover, 72-vertical rod, 73-sliding long rod, 74-round rod frame, 75-connecting frame, 76-straight rod, 77-reset spring, 78-pull rod, 81-piston tank, 82-piston push rod, 83-return spring, 84-air outlet elbow, 85-conical cover, 86-connecting short pipe, 87-check valve. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] A dough fermentation device for moon cake production, such as Figure 1-13As shown, it includes two bottom plates 1, the two bottom plates 1 are in contact, and the lower parts of the two bottom plates 1 are fixedly connected with two universal wheels 2, the two bottom plates 1 are fixedly connected with half boxes 3, the upper parts of the half boxes 3 are provided with a plurality of air holes, the two half boxes 3 are in contact, each of the half boxes 3 is connected with a door panel 41 through a hinge, each of the door panels 41 is provided with a square hole, and a transparent glass plate 42 is fixedly connected in the square hole of each door panel 41, a water basin 43 is placed on each bottom plate 1, and the two door panels 41 are fixedly connected with a magnet sheet 44, and the two magnet sheets 44 are in contact with each other, an opening and closing mechanism is arranged outside the two half boxes 3, and the opening and closing mechanism is used to separate the two half boxes 3 for cleaning, and a placing mechanism is arranged inside the two half boxes 3, and the placing mechanism is used to place fermented dough.

[0030] The opening and closing mechanism includes two limit arms 51, which are respectively fixedly connected to one side of the two half-boxes 3, and a rotating shaft 52 is rotatably connected between the two limit arms 51. An opening and closing handle 53 is fixedly connected to the upper part of the two half-boxes 3. A limit plate 54 is fixedly connected to the upper part of one of the half-boxes 3, and a groove is provided on the limit plate 54. A bent rod 55 is fixedly connected to the upper part of the other half-box 3, and a clamping rod 56 is slidably connected to the bent rod 55. A pressure spring 57 is connected between the clamping rod 56 and the bent rod 55, and the lower part of the clamping rod 56 is located in the groove on the limit plate 54.

[0031] The placement mechanism includes a plurality of magnetic rods 61, each of which is fixedly connected to the rotating shaft 52, a plurality of placement plates 62 are fixedly connected to the inner wall of each half box 3, and two of the placement plates 62 on the same horizontal line form a group, a guide plate 63 is fixedly connected to the inner wall of each half box 3, and two of the guide plates 63 on the same horizontal line form a group, and a straight groove is opened on the guide plate 63, and a placement plate 64 is placed between the two placement plates 62 of each group, and a placement groove is opened in the middle of the placement plate 64. The bottom surface of the placement groove is provided with grid lines, and each placement plate 64 is fixedly connected to a magnet block 65 on one side close to the magnetic rod 61, and the magnet block 65 is in contact with the magnetic rod 61. Each placement plate 64 is rotatably connected to a rotating rod 66 on both sides, and a torsion spring 67 is connected between the rotating rod 66 and the placement plate 64. One side of the rotating rod 66 is located in the straight groove of the guide plate 63. Each placement plate 64 is fixedly connected to a clamping block 68 on both sides, and the clamping block 68 is in contact with the side of the rotating rod 66 away from the guide plate 63.

[0032] In the actual working process, the dough for making moon cakes needs to be fermented after being kneaded. At first, the clamping rod 56 is clamped into the groove of the limiting plate 54, so that the two half boxes 3 are in contact and fixed with each other. The operator first opens the two door panels 41, and then pulls out each placement plate 64 horizontally in turn. When the placement plate 64 is pulled out horizontally, one side of the rotating rod 66 will move in the straight groove of the guide plate 63. Then, after the placement plate 64 is partially pulled out, due to the limitation of the clamping block 68, the rotating rod 66 cannot rotate in one direction, and then the rotating rod 66 will be stuck by the guide plate 63 and the clamping block 68. Then the placing plate 64 cannot be further pulled out, and then the operator places the kneaded dough on the placing plate 64 in sequence according to the grid lines on the placing plate 64. After placing, the operator pushes the placing plate 64 into the half box 3, and makes the magnet block 65 on the placing plate 64 attract the magnetic rod 61, so that the placing plate 64 is fixed. After the operator fills each placing plate 64 with dough, the door panel 41 is closed, and the two door panels 41 are attracted to each other by the magnet sheet 44 to be closed, and then the dough is left to ferment in the half box 3. The air outlet hole on the upper part of the half box 3 can ensure that the half box 3 is The air inside the dough 3 and the outside air circulate normally. After the device has been fermented for many times, in order to ensure the quality of subsequent dough fermentation, the device needs to be cleaned. First, after the dough fermentation is completed, the operator pulls out the placement plate 64, then takes the dough out of the placement plate 64, and then pushes the placement plate 64 back into the half box 3. Then, the operator lifts the clamping rod 56 upward so that the clamping rod 56 no longer clamps the limit plate 54. The operator then uses the two opening and closing handles 53 to separate the two half boxes 3 in a direction away from each other. The two half boxes 3 swing around the rotating shaft 52 as the axis. Then the placement plate 64 is fixed on the magnetic rod 61 by the magnetic force between the magnet block 65 and the magnetic rod 61. After the two half-boxes 3 are separated, the placement plate 62 and the guide plate 63 will move together, so that the placement plate 62 is out of contact with the bottom of the placement plate 64, and the guide plate 63 no longer limits the rotating rod 66. Then the operator removes the placement plate 64 for cleaning and cleans the inside of the half-box 3 at the same time. In this way, the half-box 3 and the placement plate 64 are separated, making cleaning more convenient and less likely to affect the quality of dough fermentation due to incomplete cleaning of the placement plate 64 and the inside of the half-box 3.

[0033] Example 2

[0034] On the basis of Example 1, Figure 8-11As shown, an observation mechanism is also included, which is arranged on the two half-boxes 3. The observation mechanism is used to observe and detect the degree of dough fermentation. The observation mechanism includes two isolation covers 71, and the two isolation covers 71 are respectively fixedly connected to the outer walls of the two half-boxes 3. A plurality of vertical rods 72 are fixedly connected to the inner walls of the two half-boxes 3. The two vertical rods 72 form a group, and a sliding long rod 73 is slidably connected between the two vertical rods 72 of each group. A plurality of round rod frames 74 are fixedly connected to one side of each sliding long rod 73, and a connecting frame 75 is fixedly connected to the side of each sliding long rod 73 away from the round rod frame 74. The connecting frame 75 passes through the half-box 3, and a straight rod 76 is fixedly connected between all the connecting frames 75 located on one side of the same half-box 3. The straight rod 76 passes through the isolation cover 71, and a reset spring 77 is connected between the isolation cover 71 and the straight rod 76. A pull rod 78 is fixedly connected to the upper part of each straight rod 76.

[0035] When the dough is left to ferment in the semi-box 3 for a period of time, the operator can push the pull rod 78 downward to compress the reset spring 77. The pull rod 78 moves downward to drive the straight rod 76 to move downward. The straight rod 76 moves downward to drive the connecting frame 75 to move downward together. The connecting frame 75 moves downward to drive the sliding long rod 73 and the round rod frame 74 to move downward together. After the round rod frame 74 moves downward for a distance, it will squeeze and poke the upper surface of the dough placed on the placing plate 64 for fermentation. Then the operator releases the pull rod 78 again, and the reset spring 77 drives the pull rod 78 and the straight rod 76 to move upward and reset, and then drives the round rod frame 74 to move upward and reset. Then, a depression will appear on the upper surface of the dough poked by the round rod frame 74. The operator then observes the rebound speed of the dough surface after the depression appears through the transparent glass plate 42 on the door panel 41, and evaluates the degree of dough fermentation by observing the rebound speed of the dough surface after the depression appears. In this way, it is easier for the operator to monitor the fermentation degree of the dough without directly contacting the dough, so that the dough is not easily contaminated during the fermentation process.

[0036] Example 3

[0037] On the basis of Example 2, Figure 12-13As shown, it also includes an air outlet mechanism, which is arranged on the door panel 41. The air outlet mechanism is used to extract a part of the gas in the half box 3. The air outlet mechanism includes a piston tank 81, which is fixedly connected to one of the door panels 41. A piston push rod 82 is slidably connected to the piston tank 81. A return spring 83 is connected between the piston push rod 82 and the piston tank 81. The upper part of the piston push rod 82 contacts the lower part of one of the pull rods 78. An air outlet elbow 84 is fixedly connected to the bottom of the piston tank 81, and a conical cover 85 is fixedly connected to the upper part of the air outlet elbow 84. A connecting short pipe 86 is fixedly connected to the upper part of the door panel 41, and the connecting short pipe 86 passes through the door panel 41. One end of the connecting short pipe 86 is connected to the air outlet elbow 84, and the end of the connecting short pipe 86 away from the air outlet elbow 84 is fixedly connected to a one-way valve 87.

[0038] When the operator pushes the pull rod 78 to move downward, the pull rod 78 moves downward to squeeze the piston push rod 82 to move downward, the return spring 83 is compressed, and the piston push rod 82 moves downward to squeeze out the air in the piston tank 81 through the air outlet elbow 84. When the air in the piston tank 81 flows out through the air outlet elbow 84, part of the air in the half box 3 will be sucked out through the connecting short pipe 86 and the one-way valve 87 under the principle of siphon and discharged together through the air outlet elbow 84. The discharged gas can be diffused through the conical cover 85, and then the operator can smell the smell of part of the air extracted from the half box 3 at the conical cover 85, and then judge whether there is a problem with the dough fermentation by distinguishing the smell of this part of the air, which makes the monitoring of the dough fermentation degree more comprehensive.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A dough fermentation device for mooncake production, characterized in that: The invention comprises two bottom plates (1), the two bottom plates (1) are in contact, the lower parts of the two bottom plates (1) are fixedly connected with two universal wheels (2), the two bottom plates (1) are fixedly connected with a half box (3), the upper part of the half box (3) is provided with a plurality of air holes, the two half boxes (3) are in contact, each half box (3) is connected with a door panel (41) through a hinge, each door panel (41) is provided with a square hole, and each square hole on the door panel (41) is provided with a plurality of air holes. A transparent glass plate (42) is fixedly connected inside, a water basin (43) is placed on each of the bottom plates (1), a magnet sheet (44) is fixedly connected to the two door panels (41), the two magnet sheets (44) are in contact with each other, an opening and closing mechanism is arranged outside the two half boxes (3), the opening and closing mechanism is used to separate the two half boxes (3) for cleaning, and a placing mechanism is arranged inside the two half boxes (3), the placing mechanism is used to place fermented dough.

2. A dough fermentation device for mooncake production according to claim 1, characterized in that: The opening and closing mechanism comprises two limiting arms (51), the two limiting arms (51) are respectively fixedly connected to one side of the two half boxes (3), a rotating shaft (52) is rotatably connected between the two limiting arms (51), an opening and closing handle (53) is fixedly connected to the upper part of the two half boxes (3), one of the half boxes (3) is fixedly connected to a limiting plate (54) on the upper part, a groove is provided on the limiting plate (54), a bent rod (55) is fixedly connected to the upper part of the other half box (3), a clamping rod (56) is slidably connected to the bent rod (55), a pressure spring (57) is connected between the clamping rod (56) and the bent rod (55), and the lower part of the clamping rod (56) is located in the groove on the limiting plate (54).

3. A dough fermentation device for mooncake production according to claim 2, characterized in that: The placement mechanism comprises a plurality of magnetic rods (61), each of the magnetic rods (61) is fixedly connected to the rotating shaft (52), a plurality of placement plates (62) are fixedly connected to the inner wall of each half box (3), two of the placement plates (62) on the same horizontal line form a group, a guide plate (63) is fixedly connected to the inner wall of each half box (3), two of the guide plates (63) on the same horizontal line form a group, a straight groove is formed on the guide plate (63), a placement plate (64) is placed between the two placement plates (62) in each group, a placement groove is formed in the middle of the placement plate (64), and the placement of the placement plate (64) is A grid line is provided on the bottom surface of the groove. A magnet block (65) is fixedly connected to one side of each placement plate (64) close to the magnetic rod (61), and the magnet block (65) contacts the magnetic rod (61). Both sides of each placement plate (64) are rotatably connected to a rotating rod (66). A torsion spring (67) is connected between the rotating rod (66) and the placement plate (64). One side of the rotating rod (66) is located in the straight groove of the guide plate (63). Both sides of each placement plate (64) are fixedly connected to a clamping block (68), and the clamping block (68) contacts the side of the rotating rod (66) away from the guide plate (63).

4. A dough fermentation device for mooncake production according to claim 3, characterized in that: The invention also comprises an observation mechanism, which is arranged on the two half boxes (3) and is used to observe and detect the fermentation degree of the dough. The observation mechanism comprises two isolation covers (71), which are respectively fixedly connected to the outer walls of the two half boxes (3). The inner walls of the two half boxes (3) are fixedly connected with a plurality of vertical rods (72), and the two vertical rods (72) form a group. A sliding long rod (73) is slidably connected between the two vertical rods (72) in each group, and each of the sliding long rods (73) is fixedly connected on one side. A plurality of round rod frames (74) are connected, and a connecting frame (75) is fixedly connected to one side of each sliding long rod (73) away from the round rod frame (74). The connecting frame (75) passes through the half box (3), and a straight rod (76) is fixedly connected between all the connecting frames (75) located on one side of the same half box (3). The straight rod (76) passes through the isolation cover (71), and a return spring (77) is connected between the isolation cover (71) and the straight rod (76). A pull rod (78) is fixedly connected to the upper part of each straight rod (76).

5. A dough fermentation device for mooncake production according to claim 4, characterized in that: The invention also includes an air outlet mechanism, which is arranged on the door panel (41) and is used to extract a part of the gas in the half box (3). The air outlet mechanism includes a piston tank (81), which is fixedly connected to one of the door panels (41). A piston push rod (82) is slidably connected to the piston tank (81). A return spring (83) is connected between the piston push rod (82) and the piston tank (81). The upper part of the piston push rod (82) is connected to the piston tank (81). The lower part of the pull rod (78) is in contact with the piston tank (81), the bottom of the piston tank (81) is fixedly connected with an air outlet bend pipe (84), the upper part of the air outlet bend pipe (84) is fixedly connected with a conical cover (85), the upper part of the door plate (41) is fixedly connected with a connecting short pipe (86), the connecting short pipe (86) passes through the door plate (41), one end of the connecting short pipe (86) is connected to the air outlet bend pipe (84), and the end of the connecting short pipe (86) away from the air outlet bend pipe (84) is fixedly connected with a one-way valve (87).

Images