A mixed flow fan for civil air defense

Abstract

The utility model discloses a civil air defense mixed flow fan, comprising a support base, fan blades, and a motor. A casing is arranged on the upper end surface of the support base, a protective cover is arranged on the inner side of the casing, and mutually matching locking mechanisms are arranged on the outer side of the protective cover and the inner wall of the casing. The utility model has a simple structure and a reasonable design. By setting up the locking mechanism, quick installation and disassembly of the protective cover is achieved. Compared with the traditional bolt fixing or welding method, the design simplifies the installation steps, reduces the required tools, improves the convenience of disassembly, and effectively reduces the work intensity of maintenance personnel. At the same time, the locking mechanism avoids the problem of bolt rust or breakage that may occur in the traditional bolt connection method after long-term use, eliminates maintenance troubles from the root, and ensures the smooth maintenance of the fan.

Description

Technical Field

[0001] The utility model relates to the technical field of civil air defense equipment, in particular to a civil air defense mixed flow fan. Background Art

[0002] Fans are indispensable equipment in industrial production, building ventilation and environmental control, and are widely used in various fields. According to the airflow direction and structural characteristics, fans are mainly divided into axial flow fans, centrifugal fans and mixed flow fans. The airflow of axial flow fans flows along the axial direction, with the characteristics of large flow and low pressure, and is often used in ventilation and cooling occasions. Centrifugal fans use rotating impellers to make the airflow flow out radially, which is suitable for applications requiring higher pressure, such as air conditioning systems and industrial ventilation. Mixed flow fans combine the advantages of axial flow and centrifugal fans. Their airflow flows both axially and radially, and has the characteristics of high efficiency, compact structure, moderate pressure and flow. Therefore, mixed flow fans have been widely used in building ventilation, air conditioning systems and civil air defense projects. Mixed flow fans can not only effectively improve the ventilation effect, but also provide higher air flow and pressure in a limited space, thus showing significant advantages in complex ventilation environments.

[0003] Deficiencies of existing technology:

[0004] In terms of the removal and installation of the protective cover. The current mixed flow fans on the market generally lack consideration for maintenance convenience in their designs. The protective cover is usually fixed to the casing by bolts or other fasteners, and special tools are required for removal, which not only increases maintenance time and workload, but also easily causes inconvenience in emergency situations. For example, in actual operation, when the fan blades or motor inside the fan need to be maintained or cleaned, operators often need to spend time and effort to remove multiple fasteners, and these fasteners may have rusted or are difficult to loosen due to long-term use, further increasing the difficulty of operation. Therefore, existing mixed flow fans are in urgent need of a more convenient and efficient protective cover disassembly and assembly solution to improve maintenance efficiency, reduce maintenance costs, and ensure the reliability and safety of the equipment in long-term operation. Utility Model Content

[0005] The purpose of the utility model is to provide a mixed flow fan for civil air defense to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a mixed flow fan for civil air defense, comprising a support base, a fan blade, and a motor, wherein a housing is arranged on the upper end surface of the support base, a protective cover is arranged on the inner side of the housing, and mutually matching locking mechanisms are arranged on the outer side of the protective cover and the inner side wall of the housing;

[0007] The locking mechanism comprises:

[0008] A recessed opening, the recessed opening is provided on the side of the housing, a sliding portion is provided on the inner side of the housing, one end of the sliding portion is connected to the recessed opening, and a positioning portion is provided on the other end of the sliding portion;

[0009] A raised portion, the raised portion being arranged on a side of the protective cover;

[0010] A spring rod is arranged at the outlet end of the positioning portion.

[0011] Preferably, the spring rod comprises:

[0012] A dark groove, the dark groove is opened at the outlet end of the positioning part, and a limiting cavity is arranged in the middle part of the dark groove;

[0013] A limiting rod is movably arranged in the dark groove, a retaining ring is arranged on the side of the limiting rod, a spring is arranged on the side of the retaining ring facing the inside of the dark groove, and both the retaining ring and the spring are restricted in the limiting cavity.

[0014] Preferably, a rubber sheet is provided on the inner side of the positioning portion.

[0015] Preferably, the end portion of the limiting rod is in an arc shape.

[0016] Preferably, a handle is provided on the side of the protective cover.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Quick installation and disassembly: The utility model realizes quick installation and disassembly of the protective cover by setting a unique locking mechanism, which includes a recessed mouth, a sliding part, a positioning part, a raised part and a spring rod. Compared with the traditional bolt fixing or welding method, this design not only simplifies the installation steps and reduces the required tools, but also improves the convenience of disassembly, effectively reduces the work intensity of maintenance personnel, and improves maintenance efficiency;

[0019] 2. Avoid maintenance troubles: After long-term use, the traditional bolt connection method may cause maintenance troubles due to rust or breakage of the bolts. The locking mechanism adopted by the utility model avoids this problem, eliminates the maintenance troubles caused by rust or breakage of the bolts from the root, and ensures the smooth maintenance of the fan;

[0020] 3. Enhanced stability: A rubber sheet is set between the protective cover and the casing. When the protrusion is inserted into the positioning part, the rubber sheet is squeezed and deformed, exerting an additional tightening force on the protrusion. This design not only enhances the stability of the protective cover, but also effectively prevents loosening caused by vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the casing of the utility model;

[0023] Figure 3 This is a schematic diagram of the protective cover structure of the utility model;

[0024] Figure 4 It is an enlarged view of point A of the present utility model.

[0025] In the figure: 1. support base; 2. fan blades; 3. motor; 4. housing; 5. protective cover; 6. locking mechanism; 601. recessed mouth; 602. sliding part; 603. positioning part; 604. raised part; 605. spring rod; 6051. dark groove; 6052. limiting cavity; 6053. limiting rod; 6054. resisting ring; 6055. spring; 7. rubber sheet; 8. handle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integrated connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined. Example

[0030] See also Figure 1-4 As shown, the utility model provides a technical solution of a mixed flow fan for civil air defense: a mixed flow fan for civil air defense, comprising a support base 1, a fan blade 2, and a motor 3. A casing 4 is arranged on the upper end surface of the support base 1, a protective cover 5 is installed on the inner side of the casing 4, and a locking mechanism 6 matching each other is arranged on the outer side of the protective cover 5 and the inner side wall of the casing 4;

[0031] The locking mechanism 6 includes a recessed opening 601, a raised portion 604, and a spring rod 605. The recessed opening 601 is provided on the side of the housing 4. A sliding portion 602 is provided on the inner side of the housing 4. One end of the sliding portion 602 is connected to the recessed opening 601. A positioning portion 603 is provided on the other end of the sliding portion 602. The raised portion 604 is provided on the side of the protective cover 5. The spring rod 605 is provided at the outlet end of the positioning portion 603. When installing the protective cover 5, the installer needs to align the raised portion 604 of the protective cover 5 with the recessed opening 601 of the housing 4 and move the raised portion 604 to the recessed opening 601 of the housing 4. 1, and after the protrusion 604 reaches the bottom, it rotates along the opening direction of the sliding part 602, and after reaching the top, it is pushed into the inside of the positioning part 603 of the casing 4. When the protrusion 604 reaches the bottom of the positioning part 603, the locking mechanism 6 will limit the protective cover 5 from moving out of the positioning part 603. When maintaining the internal fan blades 2 and the motor 3, the installer needs to pull out the protective cover 5 so that the protrusion 604 breaks free from the restriction of the locking mechanism 6 and enters the sliding part 602 again. Finally, it rotates along the sliding part 602 and can be taken out at the recessed opening 601.

[0032] The spring rod 605 includes a dark groove 6051 and a limiting rod 6053. The dark groove 6051 is provided at the outlet end of the positioning part 603. A limiting cavity 6052 is provided in the middle part of the dark groove 6051. The limiting rod 6053 is movably provided in the dark groove 6051. A stop ring 6054 is provided on the side of the limiting rod 6053. A spring 6055 is provided on the side of the stop ring 6054 facing the inside of the dark groove 6051. The stop ring 6054 And the spring 6055 are both restricted in the limiting cavity 6052. When the protrusion 604 enters and exits the positioning portion 603, the limiting rod 6053 will move axially. When the limiting rod 6053 is squeezed by the protrusion 604, the limiting rod 6053 will retract toward the inside of the dark groove 6051. After the squeezing is completed, the end of the limiting rod 6053 will extend out of the dark groove 6051 again. If the protrusion 604 is located in the positioning portion 603 at this time, it will be restricted.

[0033] A rubber sheet 7 is provided on the inner side of the positioning portion 603. When the protrusion 604 is inserted into the positioning portion 603, the rubber sheet 7 will be squeezed and deformed, thereby applying an additional fastening force to the protrusion 604. This design enables the protrusion 604 to be more firmly fixed in the positioning portion 603 to prevent loosening due to vibration.

[0034] The end portion of the limiting rod 6053 is in an arc shape. This design allows the installer to operate more easily when installing or removing the protective cover 5, reduces friction at the contact parts, and improves the convenience of installation and maintenance.

[0035] A handle 8 is provided on the side of the protective cover 5. This design provides a stable gripping position, allowing the installer to perform installation or maintenance operations more easily, reducing time waste due to inconvenient operation.

[0036] The working principle of the utility model is as follows:

[0037] When using a mixed flow fan for civil air defense of this embodiment, the fan is first fixed to the installation position by the support base 1, and the motor 3 is installed inside the housing 4 through the support base 1. The rotation of the motor 3 drives the fan blades 2 to rotate, generating air flow;

[0038] When it is necessary to install the protective cover 5, the installer aligns the raised portion 604 of the protective cover 5 with the recessed opening 601 of the housing 4 and pushes it toward the inside of the recessed opening 601. When the raised portion 604 reaches the bottom, it continues to rotate along the direction of the sliding portion 602 and pushes toward the inside of the positioning portion 603 of the housing 4. At this time, the limiting rod 6053 of the spring rod 605 moves axially in the dark groove 6051 and retracts toward the inside of the dark groove 6051 after being squeezed by the raised portion 604. When the raised portion 604 reaches the bottom of the positioning portion 603, the elastic force of the spring 6055 causes the end of the limiting rod 6053 to extend out of the dark groove 6051 again, limiting the position of the raised portion 604, and the protective cover 5 is locked in the positioning portion 603.

[0039] When maintaining the internal fan blades 2 and the motor 3, the installer pulls the protective cover 5 through the handle 8 to allow the protrusion 604 to break free from the restriction of the limit rod 6053 and enter the sliding part 602. Then, the protective cover 5 is rotated along the sliding part 602 and taken out at the recessed opening 601.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A mixed flow fan for civil air defense, comprising a support base (1), a fan blade (2), and a motor (3), characterized in that: The upper end surface of the support seat (1) is provided with a housing (4), the inner side of the housing (4) is provided with a protective cover (5), and the outer side of the protective cover (5) and the inner side wall of the housing (4) are provided with mutually matching locking mechanisms (6); The locking mechanism (6) comprises: a recessed opening (601), the recessed opening (601) being provided on a side surface of the housing (4), a sliding portion (602) being provided on an inner side of the housing (4), one end of the sliding portion (602) being in communication with the recessed opening (601), and a positioning portion (603) being provided at the other end of the sliding portion (602); A raised portion (604), the raised portion (604) being arranged on a side surface of the protective cover (5); A spring rod member (605) is arranged at an outlet end of the positioning portion (603).

2. The mixed flow fan for civil air defense according to claim 1, characterized in that: The spring rod (605) comprises: A dark groove (6051), the dark groove (6051) being disposed at the outlet end of the positioning portion (603), and a limiting cavity (6052) being disposed in the middle portion of the dark groove (6051); A limiting rod (6053) is movably arranged in the dark groove (6051); a stop ring (6054) is arranged on the side of the limiting rod (6053); a spring (6055) is arranged on the side of the stop ring (6054) facing the inside of the dark groove (6051); and both the stop ring (6054) and the spring (6055) are restricted in the limiting cavity (6052).

3. The mixed flow fan for civil air defense according to claim 1, characterized in that: A rubber sheet (7) is provided on the inner side of the positioning portion (603).

4. The mixed flow fan for civil air defense according to claim 2, characterized in that: The end portion of the limiting rod (6053) is in the shape of an arc.

5. The mixed flow fan for civil air defense according to claim 1, characterized in that: A handle (8) is provided on the side of the protective cover (5).

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