Reverse fan

Abstract

The utility model discloses a reverse fan, which relates to the technical field of fans and comprises a motor, a casing and an impeller, a connecting hole and an air outlet are arranged on the casing, a negative pressure seat is fixed at the connecting hole, a transmission channel and a negative pressure cavity are arranged on the negative pressure seat, a rotating shaft is mounted in the transmission channel, a driving end of the rotating shaft is connected with the motor, and a driving end of the rotating shaft is connected with the impeller. The control end of the rotating shaft is fixedly connected with the impeller; the negative pressure cavity is provided with a negative pressure air inlet hole and a communicating hole, and the machine shell forms a reverse negative pressure air inlet channel through the negative pressure air inlet hole, the negative pressure cavity, the communicating hole and the connecting hole. According to the utility model, the reverse negative pressure air inlet channel is designed, and the motor and the rotating shaft are arranged in the reverse negative pressure air inlet direction, so that reverse negative pressure air inlet can be utilized during actual work, and the rotating shaft and the like are in a micro negative pressure state, and the purpose of effective corrosion prevention is achieved. On the premise that a traditional sealing structural part is omitted, the draught fan has a better anti-corrosion effect, the draught fan structure can be further simplified, and the service life of the motor can be further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a reverse fan. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and transport gas. It is a driven fluid mechanical device. Fans usually have a simple structure, but have excellent effects such as ventilation, dust removal, and cooling, so they are widely used in various industries.

[0003] At present, when fans are used to transport gases containing corrosive substances (such as gases containing corrosive substances such as tar and acetic acid dust), it is usually necessary to set the fans to be corrosion-resistant. For example, the patent document with the announcement number CN218717785U discloses a corrosion-resistant fan structure. This patent can prevent solid impurities from entering the fan assembly and causing damage to the corrosion-resistant coating by spraying a corrosion-resistant coating inside the fan assembly and installing a filter screen inside the air intake pipe. It also solves the problem of reduced corrosion resistance of the fan assembly due to friction between solid impurities and the corrosion-resistant coating. However, after careful analysis by the inventor, it was found that the following technical problems still exist:

[0004] 1. The sealing structure between the fan housing and the motor and shaft is prone to failure due to the vibration of the shaft, which may cause leakage accidents.

[0005] 2. The position where the motor is connected to the fan housing is in the positive pressure environment of the fan. When the fan conveys gas containing corrosive substances, the corrosive substances can easily be pressed into the motor seal ring under positive pressure, causing damage to the seal ring. Severe corrosive substances can also be pressed into the motor bearings and coils and cause damage to the motor.

[0006] 3. Although the corrosion-resistant coating and the filter can prevent the friction damage of the corrosion-resistant coating by solid impurities, the process of setting the corrosion-resistant coating is relatively complicated, and it still cannot block liquid corrosive substances. In addition, when the mesh of the filter is large, it cannot effectively block small particles of solid impurities; and when the mesh of the filter is small, it will affect the air intake, so its practicality is poor.

[0007] Therefore, it is necessary to provide a new technology with better corrosion resistance, simpler structure, longer motor service life and better practicality. Utility Model Content

[0008] The purpose of the utility model is to overcome the above technical problems existing in the prior art, and provide a reverse blower. The utility model designs a reverse negative pressure air inlet channel, and sets the motor and the rotating shaft in the reverse negative pressure air inlet direction. In actual operation, the reverse negative pressure air inlet can be used to make the rotating shaft and other related structural parts in a micro-negative pressure state and achieve the purpose of effective corrosion prevention. Compared with the prior art, the utility model can not only make the blower have a better anti-corrosion effect under the premise of eliminating the traditional sealing structural parts, but also can further simplify the blower structure and increase the service life of the motor.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0010] A reverse fan comprises a motor, a casing and an impeller, wherein the casing is respectively provided with a connecting hole and an air outlet hole, a negative pressure seat is fixed at the connecting hole, a transmission channel and a negative pressure cavity are provided on the negative pressure seat, a rotating shaft is installed in the transmission channel through a supporting bearing, a driving end of the rotating shaft is connected to the motor, and a control end of the rotating shaft extends into the casing and is fixedly connected to the impeller; a negative pressure air inlet hole and a connecting hole corresponding to the connecting hole are respectively opened on the negative pressure cavity, and the casing forms a reverse negative pressure air inlet channel through the negative pressure air inlet hole, the negative pressure cavity, the connecting hole and the connecting hole.

[0011] The negative pressure seat is provided with a protrusion extending into the connecting hole, and the transmission channel passes through the protrusion.

[0012] The communicating hole is located above the protruding portion.

[0013] The casing is a closed circular structure, the connection hole is arranged in the middle of one side of the casing, and the air outlet hole is arranged on the circumferential surface of the casing.

[0014] The transmission channel is arranged along the axis of the negative pressure seat, and the negative pressure chamber surrounds the transmission channel.

[0015] A connecting flange is fixed at the negative pressure air inlet hole.

[0016] The motor is fixed on the negative pressure seat through a flange, the support bearing is fixed on one end of the transmission channel close to the impeller, and the driving end of the rotating shaft is directly fixed on the motor.

[0017] The motor is fixed on one side of the negative pressure seat, the supporting bearings are respectively fixed on both ends of the transmission channel, and the driving end of the rotating shaft is connected to the motor through a belt and a pulley.

[0018] The motor, the housing and the negative pressure seat are all fixed on the base.

[0019] The advantages of adopting the utility model are:

[0020] 1. The utility model designs a reverse negative pressure air inlet channel, and sets the motor, rotating shaft and supporting bearings in the reverse negative pressure air inlet direction. In actual operation, the reverse negative pressure air inlet can be used to put the rotating shaft, supporting bearings and other related structural parts in a micro-negative pressure state, thereby achieving the purpose of effective corrosion prevention. In addition, compared with the prior art, after the utility model adopts the above-mentioned specific structure, it can not only make the fan have a better anti-corrosion effect under the premise of eliminating the traditional sealing structural parts, but also can further simplify the fan structure and increase the service life of the motor, and has better practicality.

[0021] 2. The utility model adopts negative pressure direction as power input and has a non-sealed design throughout the entire process, which is particularly suitable for industrial transportation of highly corrosive and high-water-content mesons.

[0022] 3. In the utility model, because the motor serving as the input power is installed in the negative pressure direction, the shaft is in a slightly negative pressure state for a long time when rotating at high speed, so no sealing is required, thus solving the sealing leakage problem of the fan shaft.

[0023] 4. The utility model has only support bearings at the rotating shaft without traditional seals, thereby reducing the friction coefficient caused by the seal and achieving energy-saving effects.

[0024] 5. The utility model adopts micro-negative pressure high-speed rotation, which has a cooling effect on the support, so the support bearing works in a normal temperature environment for a long time, thereby increasing the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the utility model (I);

[0026] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the negative pressure seat;

[0028] Figure 4 This is a three-dimensional structural schematic diagram of the utility model (II).

[0029] The markings in the figure are: 1. motor, 2. casing, 3. impeller, 4. connecting hole, 5. air outlet, 6. negative pressure seat, 7. transmission channel, 8. negative pressure chamber, 9. rotating shaft, 10. negative pressure air inlet, 11. connecting hole, 12. protrusion, 13. connecting flange, 14. supporting bearing, 15. belt, 16. base. DETAILED DESCRIPTION

[0030] Example 1

[0031] like Figure 1-4As shown, this embodiment provides a reverse fan, including a motor 1, a housing 2 and an impeller 3 located in the housing 2. The housing 2 is generally a closed circular shell structure, and the housing 2 is provided with a connecting hole 4 and an air outlet 5. Figure 2 In the direction shown, the connection hole 4 is opened in the middle of the left side of the housing 2, and the air outlet 5 is opened in the lower part of the circumferential surface of the housing 2. Of course, according to actual needs, the air outlet 5 can also be opened in other corresponding positions.

[0032] Furthermore, a negative pressure seat 6 is fixed at the connection hole 4, and the negative pressure seat 6 is fixed on the casing 2 through a flange and covers and blocks the connection hole 4. A hollow transmission channel 7 and a sealed negative pressure chamber 8 are provided on the negative pressure seat 6, and the transmission channel 7 and the negative pressure chamber 8 are not connected. A support bearing 14 is fixed in the transmission channel 7, and a rotating shaft 9 is installed in the transmission channel 7 through the support bearing 14. The rotating shaft 9 has a control end and a driving end. The control end of the rotating shaft 9 extends into the casing 2 and is fixedly connected to the impeller 3. The driving end of the rotating shaft 9 is connected to the motor 1, and the motor 1 can control the rotation of the impeller 3 through the rotating shaft 9. Negative pressure air inlet holes 10 and connecting holes 11 are respectively opened on the negative pressure chamber 8. In order to facilitate connection and air intake, the negative pressure air inlet holes 10 and the connecting holes 11 are both located above the rotating shaft 9, and a connecting flange 13 is fixed at the negative pressure air inlet hole 10. The connecting hole 11 corresponds to and communicates with the upper part of the connecting hole 4. After all components are fixed, the negative pressure air inlet hole 10, the negative pressure chamber 8, the connecting hole 11 and the connecting hole 4 form a reverse negative pressure air inlet channel on the left side of the casing 2, thereby enabling the fan to form a gas delivery structure with reverse negative pressure air inlet.

[0033] According to a preferred implementation of this embodiment, the transmission channel 7 is arranged along the transverse axis of the negative pressure seat 6, and the negative pressure chamber 8 is annular and surrounds the transmission channel 7. Of course, according to different needs, the negative pressure chamber 8 can also be arc-shaped, rectangular, etc., and can be arranged above the transmission channel 7 or at other positions.

[0034] The negative pressure seat 6 in this embodiment has a structure similar to a three-way joint, which can be specifically composed of a horizontal inner tube, a horizontal outer tube with flanges at both ends, and a vertical air inlet pipe with a flange at one end. Figure 3 As shown, both ends of the transverse outer tube can be integrally formed on the transverse inner tube, the vertical air inlet tube can be integrally formed on the upper part of the transverse outer tube, the hollow inner cavity of the transverse inner tube serves as a transmission channel 7, and a negative pressure cavity 8 is formed between the transverse inner tube and the transverse outer tube. The communication hole 11 is opened at the upper right end between the transverse inner tube and the transverse outer tube, and the negative pressure air inlet hole 10 is opened at the upper part of the transverse outer tube and communicates with the vertical air inlet tube.

[0035] According to an optional implementation of this embodiment, the motor 1, the housing 2 and the negative pressure seat 6 are all fixed on the base 16. Specifically, the motor 1, the housing 2 and the negative pressure seat 6 can be fixed on the base 16 directly or fixed on the base 16 by means of a supporting structure, etc. After being fixed, each component can be fixed as a whole, which can not only improve the stability and reliability of the reverse fan, but also facilitate the handling and transportation of the reverse fan.

[0036] It should be noted that in this embodiment, the number of the connection holes 4 and the number of the air outlet holes 5 can be one or more, but preferably the number of the connection holes 4 and the number of the air outlet holes 5 are both one. When the number of the connection holes 4 is one, its aperture is relatively large, and it communicates with the transmission channel 7 and the connecting hole 11 at the same time. When the number of the connection holes 4 is multiple, the aperture of each connection hole 4 is relatively small, and each connection hole 4 communicates with the transmission channel 7 and the connecting hole 11 respectively. For example, one of the connection holes 4 can communicate with the transmission channel 7, and the other connection holes 4 can communicate with the connecting hole 11.

[0037] When this embodiment is actually used, the motor 1 drives the impeller 3 to rotate through the rotating shaft 9, and the outside air enters the casing 2 through the reverse negative pressure air inlet channel composed of the negative pressure air inlet hole 10, the negative pressure chamber 8, the connecting hole 11 and the connecting hole 4, and is discharged through the air outlet 5. In this process, since the motor 1 and the rotating shaft 9 are both installed in the negative pressure air inlet direction of the fan, on the one hand, the rotating shaft 9 is in a micro-negative pressure state for a long time, so there is no need for sealing, which avoids the problem of sealing leakage of the rotating shaft 9 in the existing fan. On the other hand, the rotating shaft 9 is only supported by the supporting bearing 14, without traditional sealing parts, which reduces the friction coefficient caused by the sealing and achieves a more energy-saving effect. On the other hand, because of the use of micro-negative pressure high-speed rotation, there is a cooling effect on the supporting bearing 14, so the supporting bearing 14 works in a normal temperature environment for a long time, thereby effectively increasing the service life of the bearing.

[0038] Example 2

[0039] Based on the embodiment 1, the structure of the negative pressure seat 6 is further improved in this embodiment. Figure 2 , 3 As shown, in this embodiment, a protrusion 12 protruding from the right flange is provided on the negative pressure seat 6. After the negative pressure seat 6 is fixed on the casing 2, the protrusion 12 extends into the connection hole 4 or extends into the casing 2 through the connection hole 4 and is closer to the impeller 3. Accordingly, the right end of the transmission channel 7 extends rightward and penetrates the protrusion 12. Since the protrusion 12 and the right end of the transmission channel 7 are closer to the impeller 3, the stability and reliability of the rotating shaft 9 can be improved, thereby making the connection stability and reliability between the rotating shaft 9 and the impeller 3 better.

[0040] According to a preferred implementation of this embodiment, the communication hole 11 is located above the protruding portion 12 and communicates with the upper portion of the connecting hole 4 .

[0041] Example 3

[0042] Based on the embodiment 1 or the embodiment 2, this embodiment further improves the connection structure between the motor 1 and the rotating shaft 9. In this embodiment, the motor 1 and the rotating shaft 9 are connected in the following two structures:

[0043] The first type: a direct connection structure is adopted between the motor 1 and the rotating shaft 9, such as Figure 1 , 2 As shown, the motor 1 is directly fixed to the left end of the negative pressure seat 6 through a flange, and the driving end of the rotating shaft 9 is directly fixed to the motor 1; accordingly, the support bearing 14 is fixed to one end (right end) of the transmission channel 7 close to the impeller 3. According to this structure, the motor 1 directly drives the rotating shaft 9 to rotate, thereby driving the impeller 3 to rotate.

[0044] The second type: an indirect connection structure is adopted between the motor 1 and the rotating shaft 9, such as Figure 4 As shown, the motor 1 is fixed to one side of the negative pressure seat 6, and the driving end of the rotating shaft 9 is connected to the motor 1 through a belt 15 and a pulley. Accordingly, the rotating shaft 9 is arranged on the negative pressure seat 6 through at least two supporting bearings 14. According to this structure, the motor 1 indirectly drives the rotating shaft 9 to rotate through the belt 15 and the pulley, thereby driving the impeller 3 to rotate.

[0045] The above description is only a specific implementation method of the present utility model. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all methods or steps in the process, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A reverse fan, comprising a motor (1), a housing (2) and an impeller (3), characterized in that: The casing (2) is provided with a connecting hole (4) and an air outlet (5), a negative pressure seat (6) is fixed at the connecting hole (4), a transmission channel (7) and a negative pressure chamber (8) are provided on the negative pressure seat (6), a rotating shaft (9) is installed in the transmission channel (7) via a supporting bearing (14), a driving end of the rotating shaft (9) is connected to the motor (1), and a control end of the rotating shaft (9) extends into the casing (2) and is fixedly connected to the impeller (3); a negative pressure air inlet hole (10) and a connecting hole (11) corresponding to the connecting hole (4) are respectively provided on the negative pressure chamber (8), and the casing (2) forms a reverse negative pressure air inlet channel through the negative pressure air inlet hole (10), the negative pressure chamber (8), the connecting hole (11) and the connecting hole (4).

2. A reverse blower according to claim 1, characterized in that: The negative pressure seat (6) is provided with a protruding portion (12) extending into the connecting hole (4), and the transmission channel (7) passes through the protruding portion (12).

3. A reverse blower according to claim 2, characterized in that: The communication hole (11) is located above the protruding portion (12).

4. A reverse blower according to claim 1, characterized in that: The casing (2) is a closed circular structure, the connection hole (4) is provided in the middle of one side of the casing (2), and the air outlet hole (5) is provided on the circumferential surface of the casing (2).

5. A reverse blower according to claim 1, characterized in that: The transmission channel (7) is arranged along the axis of the negative pressure seat (6), and the negative pressure chamber (8) surrounds the transmission channel (7).

6. A reverse blower according to claim 1, characterized in that: A connecting flange (13) is fixed at the negative pressure air inlet hole (10).

7. A reverse blower according to any one of claims 1 to 6, characterized in that: The motor (1) is fixed to the negative pressure seat (6) via a flange, the support bearing (14) is fixed to one end of the transmission channel (7) close to the impeller (3), and the driving end of the rotating shaft (9) is directly fixed to the motor (1).

8. A reverse blower according to any one of claims 1 to 6, characterized in that: The motor (1) is fixed on one side of the negative pressure seat (6), the support bearings (14) are respectively fixed on both ends of the transmission channel (7), and the driving end of the rotating shaft (9) is connected to the motor (1) via a belt (15) and a pulley.

9. A reverse blower according to claim 1, characterized in that: The motor (1), the housing (2) and the negative pressure seat (6) are all fixed on the base (16).

Images