Return air door device of negative pressure fan

Abstract

The utility model discloses a return air door device of a negative pressure fan. The return air door device of the negative pressure fan comprises an installation pipe, flange plates are installed at the two ends of the installation pipe, a rectangular pipe is installed on one side of the installation pipe, the installation pipe is communicated with the rectangular pipe, an air door plate is arranged in the installation pipe, a connecting shaft is installed at one end of the air door plate and connected with the rectangular pipe, and the connecting shaft is connected with the rectangular pipe. A fixing ring is mounted in the mounting pipe, and a sealing ring is mounted at the bottom of the air door plate. According to the return air door device of the negative pressure fan, the mounting pipe, the rectangular pipe, the air door plate, the fixing ring and the connecting shaft are arranged, automatic opening and closing of the return air door can be achieved, the resistance of the air door plate to air in a pipeline can be reduced through the turnover air door plate, energy consumption of the air pressure fan can be reduced, and ventilation efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, in particular to a return air door device of a negative pressure fan. Background Art

[0002] Negative pressure fan is a common ventilation equipment that uses the cooling principle of air convection and negative pressure ventilation. It is used in various types of factories, greenhouses, warehouses and other places where ventilation and heat dissipation are required. The air inlet of the negative pressure fan is set in the room where heat dissipation is required, and the air outlet is connected to the ventilation duct, and the hot air is discharged to the outside through the ventilation duct.

[0003] A return air damper device for a negative pressure fan of an automatic winding machine is disclosed, comprising: a negative pressure fan body, an air duct and an air damper, wherein the inner side of the negative pressure fan body is rotatably connected to a wind wheel, and the rear side of the negative pressure fan body is spirally fixed with a motor through a fixed base, wherein the output shaft of the motor is transmission-connected to the wind wheel, and the front side of the negative pressure fan body is provided with an air suction port, and the air duct is a cylindrical structure with openings at both ends. By using round steel to slide and connect the air damper at the top of the air duct, when the return air generated by the fan rushes out of the air duct, the air damper is rushed to the top of the round steel, and when the fan stops, the return air of the fan gradually disappears, and the air damper slowly descends from the round steel to cover the air duct opening, thereby realizing automatic sealing of the air duct opening. When the fan is started again, no more flying flowers and dust will fly out of the air duct, thereby solving the problem of affecting the production environment.

[0004] However, when the device is in use, the wind blown by the negative pressure fan needs to blow the damper so that the damper is always at the top of the round steel to enable normal ventilation. That is, the negative pressure fan needs to do work against the gravity of the damper, which will undoubtedly increase energy consumption and reduce the ventilation efficiency of the fan.

[0005] Therefore, it is necessary to provide a return air damper device for a negative pressure fan to solve the above technical problems. Utility Model Content

[0006] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a return air damper device of a negative pressure fan, which can reduce the energy consumption of the air pressure fan and improve the ventilation efficiency.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The return air damper device of the negative pressure fan comprises: a mounting tube, flanges are installed at both upper and lower ends of the mounting tube, the flange at the lower end is connected to the air outlet duct of the negative pressure fan, and the flange at the upper end is connected to the ventilation duct, a rectangular tube is installed on one side of the mounting tube, the mounting tube and the rectangular tube are connected to form the outer shell of the damper, a damper plate is arranged in the mounting tube, a connecting shaft is installed at one end of the damper plate, the connecting shaft is rotatably connected to the inner wall of the rectangular tube through a sealing bearing, so that the damper plate can rotate with the connecting shaft as the axis, a fixing ring is installed in the mounting tube, and a sealing ring is installed at the bottom of the damper plate.

[0009] Preferably, a counterweight frame is fixedly mounted on one end of the connecting shaft, a plurality of slots are formed on the counterweight frame, a counterweight rod is mounted on the counterweight frame, and the top end of the counterweight rod is snapped into the corresponding slot.

[0010] Preferably, a weight box is installed at the bottom end of the weight rod, and a weight object is placed in the weight box. The weight object can be a solid such as a weight, or a liquid in a sealed package.

[0011] Preferably, a limit plate is installed at the end of the counterweight rod, and the limit plate is larger than the width of the slot.

[0012] Preferably, an escape groove is provided on the counterweight frame, and the escape groove has a specification larger than the limiting plate.

[0013] Preferably, a sealing door is installed on the outer side of the rectangular tube.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The utility model can realize automatic opening and closing of the return air damper by providing a mounting tube, a rectangular tube, a damper plate, a fixing ring, and a connecting shaft. The damper plate that can be flipped can reduce the resistance of the damper plate to the air in the duct, which is beneficial to reducing the energy consumption of the air pressure fan and improving the ventilation efficiency.

[0016] (2) The utility model can conveniently adjust the rotation resistance of the damper plate by providing a counterweight frame, a counterweight rod, a counterweight box and a plurality of slots, and can be used in different situations, which is more practical and convenient;

[0017] (3) The utility model can conveniently limit the position of the counterweight rod by installing a limit plate at the end of the counterweight rod;

[0018] (4) The utility model can easily remove the counterweight rod from the counterweight frame by providing a release groove on the counterweight frame;

[0019] (5) The utility model provides a sealing door installed on the outer side of the rectangular tube, which makes it convenient to inspect and clean the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the return air damper device of the negative pressure fan provided by the utility model;

[0021] Figure 2 for Figure 1 A partial cross-sectional structural schematic diagram of a return air damper device of a negative pressure fan shown;

[0022] Figure 3 for Figure 1 A schematic diagram of the use of the return air damper device of the negative pressure fan shown;

[0023] Figure 4 for Figure 1 A schematic diagram of the connection structure between the damper plate and the counterweight frame in the return air damper device of the negative pressure fan shown;

[0024] Figure 5 for Figure 1 The schematic diagram of the structure of the counterweight frame in the return air damper device of the negative pressure fan is shown.

[0025] Among them, the names corresponding to the figure marks are: 1-mounting tube, 2-flange, 3-rectangular tube, 4-sealing door, 5-air damper plate, 6-counterweight frame, 7-fixing ring, 8-connecting shaft, 9-sealing ring, 10-counterweight rod, 11-counterweight box, 12-limiting plate, 13-slot, 14-escape slot. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0027] Embodiment 1:

[0028] like Figure 1-5As shown, the return air damper device of the negative pressure fan provided by the utility model comprises: a mounting tube 1, flanges 2 are installed at the upper and lower ends of the mounting tube 1, the flange 2 at the lower end is connected to the air outlet pipe of the negative pressure fan, and the flange at the upper end is connected to the ventilation duct, a rectangular tube 3 is installed on one side of the mounting tube 1, the mounting tube 1 and the rectangular tube 3 are communicated, thereby forming the outer shell of the damper, a damper plate 5 is arranged in the mounting tube 1, a connecting shaft 8 is installed at one end of the damper plate 5, the connecting shaft 8 is rotatably connected to the inner wall of the rectangular tube 3 through a sealing bearing, so that the damper plate 5 can rotate with the connecting shaft 8 as the axis, a fixing ring 7 is installed in the mounting tube 1, and a sealing ring 9 is installed at the bottom of the damper plate 5. When in use, when the negative pressure fan is enabled for normal ventilation, the hot air in the factory is discharged into the mounting tube 1, and under the action of wind pressure, the damper plate 5 is turned upward with the connecting shaft 8 as the axis until the damper plate 5 When the top touches the top of the rectangular tube 3, it stops rotating. At this time, only a part of the damper plate 5 remains in the mounting tube 1, and the damper plate 5 is in an inclined state, the wind resistance is smaller, and the negative pressure fan only needs to counteract a part of the gravity of the damper plate 5 (this value is related to the inclination angle of the damper plate 5, which will not be described here), so that the damper plate 5 can maintain balance, so there is less useless work. Through the above measures, the energy consumption of the negative pressure fan can be reduced and the ventilation efficiency of the negative pressure fan can be improved. The internal air path of the mounting tube 1 is unobstructed, and the hot air is discharged from the mounting tube 1 into the ventilation duct and then discharged outdoors. When the negative pressure fan is stopped, under the action of gravity, the damper plate 5 is reversed with the connecting shaft 8 as the axis, so that the damper plate 5 is reset, and the sealing ring 9 at the bottom is pressed on the fixing ring 7. The gravity seals the two, thereby closing the internal air path of the mounting tube 1, that is, the damper is closed, thereby realizing the automatic opening and closing of the damper.

[0029] By providing the mounting tube 1, the rectangular tube 3, the damper plate 5, the fixing ring 7 and the connecting shaft 8, the automatic opening and closing of the return air damper can be realized. By utilizing the flippable damper plate 5, the resistance of the damper plate 5 to the air in the duct can be reduced, which is beneficial to reducing the energy consumption of the air pressure fan and improving the ventilation efficiency.

[0030] Embodiment 2:

[0031] like Figure 1-5 As shown, a counterweight frame 6 is fixedly mounted on one end of the connecting shaft 8, and a plurality of slots 13 are provided on the counterweight frame 6. A counterweight rod 10 is mounted on the counterweight frame 6. The top end of the counterweight rod 10 is clamped in the corresponding slot 13. A counterweight box 11 is mounted on the bottom end of the counterweight rod 10. The counterweight box 11 is used to place a counterweight object. The counterweight object can be a solid such as a weight, or a sealed packaged liquid. When in use, when the negative pressure fan is stopped and the damper is closed, the counterweight rod 10 is clamped in the slot 13 on the left side of the center of gravity of the connecting shaft 8 ( Figure 2As shown), under the action of gravity, the pressure of the damper plate 5 on the sealing ring 9 is increased so that the sealing ring 9 can maintain a better seal, and the farther the counterweight rod 10 is from the connecting shaft 8, the greater the pressure and the better the sealing effect. When the negative pressure fan is enabled and the damper is opened, the counterweight rod 10 is clamped in the slot 13 on the right side of the center of gravity of the connecting shaft 8. The gravity of the counterweight rod 10, the counterweight box 11 and the counterweight in the counterweight box 11 are used to offset part of the gravity of the damper plate 5. The farther the counterweight rod 10 is from the connecting shaft 10, the better the effect. When the wind pressure in the mounting pipe 1 is relatively small, the damper plate 5 can be driven to flip up and open, and keep it balanced, which can effectively reduce the energy consumption of the negative pressure fan and improve the ventilation efficiency.

[0032] By providing the counterweight frame 6, the counterweight rod 10, the counterweight box 11 and a plurality of slots 13, the rotational resistance of the damper plate 5 can be conveniently adjusted, and can be used in different situations, which is more practical and convenient.

[0033] Embodiment 3:

[0034] like Figure 5 As shown, a limit plate 12 is installed at the end of the counterweight rod 10, and the limit plate 12 is larger than the width of the slot 13. When in use, the end of the counterweight rod 10 is clamped in the slot 13, and the limit plate 12 on the other side prevents the counterweight rod 10 from falling out of the slot 13.

[0035] By installing the limit plate 12 at the end of the counterweight rod 10 , the counterweight rod 10 can be conveniently limited.

[0036] Embodiment 4:

[0037] like Figure 5 As shown, the counterweight frame 6 is provided with an escape groove 14, and the specification of the escape groove 14 is larger than the limit plate 12. When in use, the counterweight rod 10 is lifted up to make it escape from the slot 13, and then the counterweight rod 10 is moved horizontally, the limit plate 12 is aligned with the escape groove 14, and then the counterweight rod 10 is moved outward, and the counterweight rod 10 can be removed from the counterweight frame 6.

[0038] By providing the escape slot 14 on the counterweight frame 6 , the counterweight rod 10 can be easily removed from the counterweight frame 6 .

[0039] Embodiment 5:

[0040] like Figure 1 As shown, a sealing door 4 is installed on the outer side of the rectangular tube 3. When the damper needs to be inspected, the sealing door 4 is opened to inspect the damper plate 5, and the installation tube 1 and the inside of the rectangular tube 3 can be cleaned.

[0041] By installing a sealing door 4 on the outer side of the rectangular tube 3, the device can be easily inspected and cleaned.

[0042] Working principle: When in use, when the negative pressure fan is enabled and ventilated normally, the hot air in the factory is discharged into the installation pipe 1. Under the action of wind pressure, the damper plate 5 is turned upward with the connecting shaft 8 as the axis until the top of the damper plate 5 contacts the top of the rectangular tube 3 and stops rotating. The air path inside the installation pipe 1 is unobstructed, and the hot air is discharged from the installation pipe 1 into the ventilation duct and then discharged outdoors. At this time, only a part of the damper plate 5 remains in the installation pipe 1, and the damper plate 5 is in an inclined state, with smaller wind resistance, and the negative pressure fan only needs to resist a part of the gravity of the damper plate 5 to keep the damper plate 5 balanced, with less useless work, which can reduce the energy consumption of the negative pressure fan and improve the ventilation efficiency of the negative pressure fan.

[0043] When the negative pressure fan is stopped, under the action of gravity, the damper plate 5 is reversed with the connecting shaft 8 as the axis, so that the damper plate 5 is reset, and the sealing ring 9 at the bottom is pressed on the fixing ring 7. The gravity seals the two, and then the internal air path of the installation pipe 1 is closed, that is, the damper is closed, thereby realizing the automatic opening and closing of the damper.

Claims

1. A return air damper device for a negative pressure fan, characterized in that: include: A mounting tube (1), flanges (2) are mounted on both ends of the mounting tube (1), a rectangular tube (3) is mounted on one side of the mounting tube (1), the mounting tube (1) is in communication with the rectangular tube (3), a damper plate (5) is arranged inside the mounting tube (1), a connecting shaft (8) is mounted on one end of the damper plate (5), the connecting shaft (8) is connected to the rectangular tube (3), a fixing ring (7) is mounted inside the mounting tube (1), and a sealing ring (9) is mounted on the bottom of the damper plate (5).

2. A return air damper device for a negative pressure fan according to claim 1, characterized in that: A counterweight frame (6) is mounted on one end of the connecting shaft (8), a plurality of slots (13) are formed on the counterweight frame (6), a counterweight rod (10) is provided on the counterweight frame (6), and the counterweight rod (10) is connected to the corresponding slots (13).

3. A return air damper device for a negative pressure fan according to claim 2, characterized in that: A counterweight box (11) is installed at the bottom end of the counterweight rod (10), and a counterweight object is placed in the counterweight box (11).

4. The return air damper device of a negative pressure fan according to claim 2, characterized in that: A limit plate (12) is installed at the end of the counterweight rod (10).

5. The return air damper device of a negative pressure fan according to claim 2, characterized in that: The counterweight frame (6) is provided with an escape groove (14).

6. The return air damper device of a negative pressure fan according to claim 1, characterized in that: A sealing door (4) is installed on the outer side of the rectangular tube (3).

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