Axial flow fan for ventilation

Abstract

The utility model discloses an axial flow fan for ventilation, which relates to the field of fans, and adopts the technical scheme that the axial flow fan comprises a shell and an impeller fixed in the shell, the front side and the rear side of the shell are respectively provided with a front turnup and a rear turnup, both the front turnup and the rear turnup are provided with mounting holes, the front turnup is integrally formed on the shell, and the rear turnup is integrally formed on the shell. The rear flange is detachably connected to the shell through a bolt, and the inner diameter of the rear flange is equal to the outer diameter of the shell. After people detach the rear turnup edge from the shell, the rear turnup edge is tightly attached to the wall, and then the contour line of the mounting groove is drawn along the inner edge of the rear turnup edge, so that people do not need to measure the outer diameter of the shell, and through the assistance of the rear turnup edge, the drawn contour line does not have errors, and people can conveniently draw the contour line; the outer wall of the fan is tightly attached to the inner wall of the mounting groove, and the fan is fixed through expansion bolts, so that the fixing strength of the fan is high, and noise is low in the operation process.

Description

Technical Field

[0001] The utility model relates to the field of fans, and more specifically, it relates to an axial flow fan for ventilation. Background Art

[0002] An axial flow fan refers to a fan whose air flow direction is the same as the axis direction of the fan blades, that is, the air flow direction is parallel to the axis. When the motor drives the impeller to rotate, the blades in the impeller suck air from the air inlet, and under the push of the blades, it is discharged along the diversion direction of the casing, so as to achieve the purpose of ventilation and air change.

[0003] In some factories, in order to reduce the floor area occupied by the axial flow fan, some axial flow fans are directly installed in the wall. People open an installation groove penetrating the wall on the wall and directly install the axial flow fan in the installation groove. When opening the installation groove, the diameter of the installation groove needs to match the outer diameter of the fan casing. If the installation groove is too large, the axial flow fan cannot fit tightly, resulting in the fan shaking or loosening after installation. If the installation groove is too small, it will be difficult to install the axial flow fan. Therefore, it is necessary to measure the size of the fan casing before opening the installation groove, and then open the installation groove according to the size of the casing. However, during the manual measurement process, errors are inevitable, and once an error occurs, the diameter of the installation groove will not meet the requirements.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Utility Model

[0005] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide an axial flow fan for ventilation.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: an axial flow fan for ventilation, including a casing and an impeller fixed in the casing. The front and rear sides of the casing are respectively provided with a front flange and a rear flange. Installation holes are opened on both the front flange and the rear flange. The front flange is integrally formed on the casing, and the rear flange is detachably connected to the casing by bolts. The inner diameter of the rear flange is equal to the outer diameter of the casing.

[0007] The utility model is further provided as follows: an installation ring is fixedly connected to one side of the rear flange. The inner diameter of the installation ring is equal to the inner diameter of the rear flange. The installation ring and the casing are jointly penetrated by bolts.

[0008] The utility model is further provided as follows: a number of first installation blocks are fixedly connected to the outer peripheral wall of the installation ring, and a number of second installation blocks corresponding to the first installation blocks are fixedly connected to the inner peripheral wall of the casing. Through holes for bolts to pass through are opened on both the first installation blocks and the second installation blocks.

[0009] The present utility model is further configured such that: a positioning groove is provided at the rear side of the outer shell, and a positioning block is fixedly connected to the inner peripheral wall of the mounting ring. When the positioning block is inserted into the positioning groove, the through holes on the first mounting block and the second mounting block are aligned with each other.

[0010] The present utility model is further configured such that: the side of the mounting ring facing away from the rearward flanging is flush with one side of the positioning block, and the thickness of the positioning block is less than half of the length of the mounting ring.

[0011] The present utility model is further configured such that: there is only one positioning block on the mounting ring.

[0012] The present utility model is further configured such that: the first mounting block is arranged offset from the mounting hole on the rearward flanging.

[0013] In summary, the present utility model has the following beneficial effects: Before people open the mounting groove on the wall, people remove the rearward flanging from the outer shell. After determining the position where the mounting groove needs to be opened, the rearward flanging is closely attached to the wall, and then the contour line of the mounting groove is drawn along the inner edge of the rearward flanging. This setting enables people not to measure the outer diameter of the outer shell anymore. With the assistance of the rearward flanging, not only will the drawn contour line not be incorrect, but it also facilitates people to draw the contour line. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the present utility model;

[0015] Figure 2 is an exploded view of the present utility model;

[0016] Figure 3 is Figure 2 an enlarged view of part A in

[0017] Figure 4 is a schematic structural view of the rearward flanging in the present utility model.

[0018] In the figure: 1, outer shell; 2, frontward flanging; 3, rearward flanging; 4, mounting hole; 5, mounting ring; 6, first mounting block; 7, second mounting block; 8, through hole; 9, positioning groove; 10, positioning block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be described in detail below with reference to the drawings and embodiments.

[0020] Axial flow fan for ventilation, such as Figure 1 and Figure 2As shown in the figure, it includes a housing 1 and an impeller fixed inside the housing 1. Front flanges 2 and rear flanges 3 are respectively provided on the front and rear sides of the housing 1. Mounting holes 4 are provided on both the front flanges 2 and the rear flanges 3. The front flanges 2 are integrally formed on the housing 1, and the rear flanges 3 are detachably connected to the housing 1 by bolts. The inner diameter of the rear flanges 3 is equal to the outer diameter of the housing 1. Before people cut an installation groove on the wall, people remove the rear flanges 3 from the housing 1. After determining the position where the installation groove needs to be cut, the rear flanges 3 are closely attached to the wall, and then the contour line of the installation groove is drawn along the inner edge of the rear flanges 3. This setting enables people not to measure the outer diameter of the housing 1 anymore. With the assistance of the rear flanges 3, not only will the drawn contour line not be incorrect, but it also facilitates people to draw the contour line. After the installation groove is cut, people insert the housing 1 into the installation groove. The rear side of the housing 1 can be directly inserted into the installation groove without the restraint of the rear flanges 3. Then people fix the rear flanges 3 to the housing 1 by bolts. Expansion bolts are driven into both the inner and outer sides of the wall. After people pass the expansion bolts through the mounting holes 4 on the front flanges 2 and the rear flanges 3, nuts are threadedly connected to the expansion bolts, thereby firmly fixing the axial flow fan in the installation groove.

[0021] As Figure 2 and Figure 3As shown in the figure, a mounting ring 5 is fixedly connected to one side of the rear flanging 3. The inner diameter of the mounting ring 5 is equal to the inner diameter of the rear flanging 3. The mounting ring 5 and the outer shell 1 are both penetrated by bolts. The bolts penetrate through the mounting ring 5 and the outer shell 1 from top to bottom respectively, and then nuts are threadedly connected to the bolts, thereby realizing the fixation of the rear flanging 3 and the outer shell 1. When the rear flanging 3 is fixed on the outer shell 1, the side of the mounting ring 5 facing away from the outer shell 1 is flush with the rear side of the casing. A number of first mounting blocks 6 are fixedly connected to the outer peripheral wall of the mounting ring 5. The number of first mounting blocks 6 is arranged in a circular array on the mounting ring 5. A number of second mounting blocks 7 corresponding to the first mounting blocks 6 one by one are fixedly connected to the inner peripheral wall of the outer shell 1. The number of the second mounting blocks 7 is equal to the number of the first mounting blocks 6, and the mutually facing sides of the corresponding first mounting blocks 6 and second mounting blocks 7 are parallel to each other. Through holes 8 for the bolts to pass through are provided on both the first mounting blocks 6 and the second mounting blocks 7. By providing the first mounting blocks 6 and the second mounting blocks 7, the head of the bolt is closely attached to one side of the first mounting block 6, and the nut is closely attached to one side of the second mounting block 7, ensuring the stability of the threaded connection of the nut. A positioning groove 9 is provided on the rear side of the outer shell 1. A positioning block 10 is fixedly connected to the inner peripheral wall of the mounting ring 5. When the positioning block 10 is embedded in the positioning groove 9, the through holes 8 on the first mounting blocks 6 and the second mounting blocks 7 are aligned with each other. By providing the positioning block 10 and the positioning groove 9, when the rear flanging 3 is installed and fixed to the outer shell 1, the position of the rear flanging 3 can be determined by the structure of the positioning block 10 and the positioning groove 9, so as to ensure that the through holes 8 on the first mounting blocks 6 and the second mounting blocks 7 are aligned with each other, facilitating the fixation of the bolts. The side of the mounting ring 5 facing away from the rear flanging 3 is flush with one side of the positioning block 10. When people draw a contour line on the wall, they attach the side of the rear flanging 3 facing away from the mounting ring 5 to the wall. Since the thickness of the positioning block 10 is less than half of the length of the mounting ring 5, there is a certain distance between the positioning block 10 and the inner edge of the rear flanging 3, so that the setting of the positioning block 10 is not likely to affect people's drawing of the contour line of the installation groove. The number of the positioning blocks 10 on the mounting ring 5 is only one. Such a setting further reduces the influence of the positioning block 10 on people's drawing of the contour line. The first mounting blocks 6 are arranged in a staggered manner with the mounting holes 4 on the rear flanging 3. Since the first mounting blocks 6 protrude from the outer wall of the mounting ring 5, the first mounting blocks 6 are arranged in a staggered manner with the mounting holes 4, so that the first mounting blocks 6 do not affect people's screwing of the nut onto the expansion bolt.

[0022] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An axial flow fan for ventilation, comprising a housing (1) and an impeller fixed within the housing (1), characterized in that: The front and rear sides of the housing (1) are respectively provided with a front flange (2) and a rear flange (3). Mounting holes (4) are provided on both the front flange (2) and the rear flange (3). The front flange (2) is integrally formed on the housing (1), and the rear flange (3) is detachably connected to the housing (1) by bolts. The inner diameter of the rear flange (3) is equal to the outer diameter of the housing (1).

2. The axial flow fan for ventilation according to claim 1, characterized in that: An installation ring (5) is fixedly connected to one side of the rear flange (3). The inner diameter of the installation ring (5) is equal to the inner diameter of the rear flange (3). The installation ring (5) and the housing (1) are both penetrated by bolts.

3. The axial flow fan for ventilation according to claim 2, characterized in that: A number of first installation blocks (6) are fixedly connected to the outer peripheral wall of the installation ring (5). A number of second installation blocks (7) corresponding to the first installation blocks (6) are fixedly connected to the inner peripheral wall of the housing (1). Through holes (8) for bolts to pass through are provided on both the first installation blocks (6) and the second installation blocks (7).

4. The axial flow fan for ventilation according to claim 3, characterized in that: A positioning groove (9) is provided on the rear side of the housing (1). A positioning block (10) is fixedly connected to the inner peripheral wall of the installation ring (5). When the positioning block (10) is inserted into the positioning groove (9), the through holes (8) on the first installation blocks (6) and the second installation blocks (7) are aligned with each other.

5. The axial flow fan for ventilation according to claim 4, characterized in that: The side of the installation ring (5) facing away from the rear flange (3) is flush with one side of the positioning block (10). The thickness of the positioning block (10) is less than half of the length of the installation ring (5).

6. The axial flow fan for ventilation according to claim 5, characterized in that: The number of the positioning blocks (10) on the installation ring (5) is only one.

7. The axial flow fan for ventilation according to claim 3, characterized in that: The first installation blocks (6) are arranged in a staggered manner with the mounting holes (4) on the rear flange (3).

Images