A detachable external hanging screen fan fixing device

Abstract

The application discloses a detachable external hanging screen fan fixing device, which comprises an outer frame fixed outside a window, wherein the cross section of the outer frame is in L-shaped structure; a screen fan assembly is arranged in the outer frame, the screen fan assembly is composed of two vertical inner frames, two horizontal inner frames and a screen net, the horizontal inner frame and the vertical inner frame are combined to form a rectangular shape; the cross section of the vertical inner frame and the horizontal inner frame is in rectangular structure, and the two ends are in 45° chamfer structure which is mutually matched; a cutout is formed in the middle of the inner side of the vertical inner frame and the horizontal inner frame, and the width of the cutout is not less than the thickness of the screen net; a fixing rod is fixedly connected to the position corresponding to the vertical inner frame on the two sides of the screen net; the fixing shaft is detachable, so that the external hanging screen fan assembly can be quickly and conveniently taken down; the other end of the first inserting rod is inserted into the inserting hole in the fixing shaft by pushing the one end of the first inserting rod away from the fixing shaft, the quick fixing of the fixing shaft is completed, and the owner can conveniently and easily operate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of screen installation, and particularly relates to a detachable external screen fixing device. BACKGROUND

[0002] A screen is a semi-fixed door and window that can be opened or moved, and is usually installed at the interface between indoor and outdoor spaces. An external screen is a form of screen, and its installation position is different from that of a common screen. The external screen is installed on the outside of a window, and can have better mosquito prevention effect, ventilation performance, and smaller indoor space occupation area.

[0003] In the prior art, the external screen is more complex in the fixing mode than the common screen. The external screen mainly comprises a frame, a screen and hardware parts. The frame serves as a connecting bridge between the door and window and the wall, and comprises upper and lower frames, side frames, a middle horizontal frame and a middle vertical frame, to ensure stable installation. The screen is the main part, and the skeleton is composed of an upper protruding head, a lower protruding head, a side frame and a core, and the screen is embedded in the middle, which is both beautiful and practical. During specific installation and fixing, hinges, bolts and wind hooks are used for connection, and mortise and tenon, welding and screws are used for assembly process, to ensure the fixing of the external screen. This series of complex installation steps finally endow the external screen with the dual advantages of ventilation and mosquito prevention, and bring convenience and comfort to home life.

[0004] Due to the mosquito prevention function, most screens are fixed and installed on floors close to the ground, which can effectively block mosquitoes, mice and snakes. However, due to long-term exposure of the screen to sunlight, wind and rain, ultraviolet radiation and humid environment can accelerate the aging process of the screen, making the screen fragile and easily broken, and unable to effectively block mosquitoes from entering the indoor space. In addition, dust will also adhere to the screen, resulting in poor ventilation effect. Therefore, regular maintenance is required.

[0005] However, the current external screen is difficult to disassemble and install due to the complex fixing mode. Many families often delay or give up maintenance of the screen due to the tedious disassembly process, which directly affects the service life and mosquito prevention effect of the screen. Therefore, it is necessary to provide an external screen that is easy to install and disassemble. SUMMARY

[0006] The present application aims to provide a detachable external screen fixing device to solve the technical problem that the external screen cannot be quickly and conveniently disassembled or installed due to the use of multiple assembly processes to fix the external screen in the prior art, resulting in difficult maintenance in the later period.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] The utility model provides a detachable fixed device of external hanging screen fan, including the outer frame fixed in the outside of window, the cross section of outer frame presents L shaped structure, the screen fan assembly is arranged in the outer frame, and the screen fan assembly is composed of two vertical inner frames, two horizontal inner frames and a screen net, and the horizontal inner frame and vertical inner frame combine to form a rectangular shape,

[0009] The cross section of the vertical inner frame and the horizontal inner frame is rectangular structure, and both ends are 45 degree chamfer structure that fits each other, the inner side middle part of the vertical inner frame and the horizontal inner frame is provided with a cutout, the cutout width is not less than the thickness of the screen net, the fixed rod is fixedly connected with the position corresponding to the vertical inner frame on both sides of the screen net, and the fixed rod presents long rod structure with rectangular cross section, and the width is not less than the width of the cutout,

[0010] The lower surface of the corner of the horizontal inner frame is fixedly connected with a fixed ring, and the upper and lower horizontal inner frames are symmetrically arranged, the fixed shaft is detachably inserted in the position corresponding to the fixed ring of the outer frame, the fixed assembly is arranged in the position corresponding to the fixed shaft of the outer frame, and the fixed assembly includes the insertion hole arranged on the fixed shaft.

[0011] Preferably, the wedge-shaped block is fixedly connected with the position corresponding to the cutout on both sides of the vertical inner frame, the height of the wedge-shaped block is same with the length of the fixed rod, and the upper part is located in the upper part, and the lower part is located in the lower part.

[0012] Preferably, the position of the vertical inner frame and the horizontal inner frame is fixedly connected with the solid block that the shape fits, the vertical inner frame and the horizontal inner frame are provided with the countersunk groove corresponding to the position of the 45 degree chamfered surface, the screw is arranged in the countersunk groove, and the horizontal inner frame and the vertical inner frame are connected through the screw, so that the rectangular shape is formed.

[0013] Preferably, the fixed assembly further includes the first shell fixedly arranged on the bottom and the upper part of the outer frame, the first insertion rod is slidably connected in the first shell, the outer diameter of the end of the first insertion rod is same with the inner diameter of the insertion hole, the annular block is fixedly connected with the side of the first insertion rod close to the insertion hole, the spring is sleeved with the position corresponding to the annular block of the first insertion rod, one end of the spring is connected with the annular block, and the other end is connected with the end of the first shell close to the insertion hole.

[0014] Preferably, the first convex block is fixedly connected with the side of the first insertion rod away from the fixed shaft, the sleeve pipe is rotationally connected with the position corresponding to the first convex block of the first insertion rod, the first sliding groove is arranged on the sleeve pipe, the width of the first sliding groove is same with the width of the first convex block, the first knob is fixedly connected with the end of the sleeve pipe away from the fixed shaft, and the first knob is protruded from the lower part of the first shell.

[0015] Preferably, the fixing assembly further comprises a second shell fixedly arranged at the bottom and the upper portion of the outer frame; a second inserting rod is slidably connected inside the second shell, and the two ends of the second inserting rod penetrate through the second shell; a groove is arranged symmetrically on the second inserting rod; a second protrusion is fixedly connected at the connection between the second shell and the second inserting rod, and the width of the second protrusion is equal to the width of the groove.

[0016] Preferably, a plurality of annular grooves are arranged uniformly on the second inserting rod at a position corresponding to the position between the two ends of the second shell; a second knob is rotatably connected to the second inserting rod at a position corresponding to the annular groove; a third protrusion is fixedly connected symmetrically on the second knob, and the width of the third protrusion is the same as the width of the groove.

[0017] Preferably, a limiting tube is sleeved on the second inserting rod at a position corresponding to the two sides of the second knob, and the limiting tube is used to limit the position of the second knob; an end block is fixedly connected to the end of the second inserting rod away from the fixing shaft.

[0018] Preferably, a positioning block is fixedly connected to the fixing shaft; a matching positioning groove is arranged on the outer frame at a position corresponding to the positioning block.

[0019] Preferably, the end of the first inserting rod away from the fixing shaft is pushed to insert the other end of the first inserting rod into the insertion hole on the fixing shaft, then the first knob is rotated to change the initial position of the knob, so that the position of the first sliding groove is offset from the position of the first protrusion; the position of the first knob is limited by the first shell, and the first inserting rod cannot move under the action of the spring, so that the position of the first inserting rod is fixed.

[0020] The beneficial effects of the present application are as follows:

[0021] 1) The fixing shaft of the present application is detachable, so that the externally hung screen fan assembly can be quickly and conveniently removed; the end of the first inserting rod away from the fixing shaft is pushed to insert the other end of the first inserting rod into the insertion hole on the fixing shaft, so that the fixing shaft is quickly fixed, which is convenient for the owner to operate.

[0022] 2) The first knob is rotated to change the initial position of the knob, so that the position of the first sliding groove is offset from the position of the first protrusion; since the position of the first knob is limited by the first shell, the first inserting rod cannot move under the action of the spring, so that the position of the first inserting rod is fixed; since only the owner knows the initial position of each first knob, the owner can only disassemble and remove the screen fan structure, which has a simple anti-theft function and is safe for use in houses with low floors.

[0023] 3) The present application sets the wedge-shaped block of narrow upper and wide lower, when installing the gauze from top to bottom, the gauze can be gradually stretched and straightened by the cooperation of the fixed rod and the wedge-shaped block, which has good tension directly, and does not need to be adjusted by tools later, which is convenient for the owner to install and disassemble. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings.

[0025] Figure 1 is the overall structure schematic diagram of the embodiment one of the present application;

[0026] Figure 2 is the exploded view of the embodiment one of the present application;

[0027] Figure 3 is the transverse sectional view of the embodiment one of the present application;

[0028] Figure 4 is the longitudinal sectional view of the embodiment one of the present application;

[0029] Figure 5 is the Figure 4 enlarged view of the part A in the figure;

[0030] Figure 6 is the exploded view of the first insertion rod structure in the present application;

[0031] Figure 7 is the overall structure schematic diagram of the embodiment two of the present application;

[0032] Figure 8 is the Figure 7 enlarged view of the part B in the figure;

[0033] Figure 9 is the exploded view of the embodiment two of the present application.

[0034] In the figure: 1, outer frame; 2, vertical inner frame; 3, horizontal inner frame; 4, fixed rod; 5, gauze; 6, cutout; 7, solid block; 8, fixed ring; 9, fixed shaft;

[0035] 911, insertion hole; 912, first shell; 913, first insertion rod; 914, annular block; 915, spring; 916, first protruding block; 917, sleeve; 918, first sliding groove; 919, first knob;

[0036] 921, second shell; 922, second protruding block; 923, groove; 924, annular groove; 925, second knob; 926, third protruding block; 927, limiting tube; 928, end block; 929, second insertion rod;

[0037] 10, wedge-shaped block; 11, countersunk groove; 12, bolt; 13, positioning block. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be apparently and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0039] Embodiment one: please refer to Figures 1-2 As shown in FIG. 1, a fixing device of a detachable external hanging screen fan includes an outer frame 1 fixed outside a window, the cross section of the outer frame 1 presents an L-shaped structure; a screen fan assembly is arranged in the outer frame 1, the screen fan assembly is mainly composed of two vertical inner frames 2, two horizontal inner frames 3 and a screen 5, the horizontal inner frame 3 and the vertical inner frame 2 are combined to form a rectangular shape.

[0040] Please refer to FIG. 2 again Figure 2 and Figure 3 As shown in FIG. 2, the cross sections of the vertical inner frame 2 and the horizontal inner frame 3 both present a rectangular structure, both ends present a 45° chamfer structure that fits each other; a cutout 6 is arranged in the middle of the inner side of the vertical inner frame 2 and the horizontal inner frame 3, the width of the cutout 6 is not less than the thickness of the screen 5; a fixed rod 4 is fixedly connected to the position corresponding to the vertical inner frame 2 on both sides of the screen 5, the fixed rod 4 presents a long rod structure with a rectangular cross section, the width of the fixed rod 4 is not less than the width of the cutout 6, the screen 5 is fixed in the rectangular shape formed by the combination of the horizontal inner frame 3 and the vertical inner frame 2 through the vertical inner frame 2 with the cutout 6.

[0041] A wedge-shaped block 10 is fixedly connected to the positions corresponding to both sides of the cutout 6 in the vertical inner frame 2, the height of the wedge-shaped block 10 is the same as the length of the fixed rod 4, and the narrower end of the inclined surface is located at the upper part and the wider end is located at the lower part.

[0042] By arranging the wedge-shaped block 10 with the upper part narrower and the lower part wider, when the screen 5 is inserted and installed from top to bottom, the screen 5 can be gradually stretched and straightened by the cooperation of the fixed rod 4 and the wedge-shaped block 10, and has good tension, so that it is not necessary to adjust by means of tools later, and it is convenient for the owner to install by himself.

[0043] Please refer to FIG. 3 again Figure 4 and Figure 5 As shown in FIG. 3, the positions where the vertical inner frame 2 and the horizontal inner frame 3 are connected are respectively fixedly connected with a solid block 7 with a matching shape, the solid block 7 can strengthen the connection strength of the frame body; a countersunk groove 11 is arranged at the positions corresponding to the 45° chamfered surface of the vertical inner frame 2 and the horizontal inner frame 3; a bolt 12 is arranged in the countersunk groove 11, the horizontal inner frame 3 and the vertical inner frame 2 are connected through the bolt 12, so that the combination of the horizontal inner frame 3 and the vertical inner frame 2 is completed to fix the screen 5.

[0044] The vertical inner frame 2, the horizontal inner frame 3 and the screen 5 connected by the bolt 12 can be quickly disassembled during subsequent maintenance. Since the screen 5 is in a loose state after being disassembled, it is more convenient for the owner to clean. Since the screen 5 is composed of two fixed rods 4 and a piece of screen 5 and is not connected with the inner frame (the horizontal inner frame 3 and the vertical inner frame 2), the cost is low. When the screen 5 is completely damaged, the screen 5 can be directly replaced, which is convenient for the owner to maintain.

[0045] Please refer again to Figure 5 and Figure 6 , the lower surface of the corner of the horizontal inner frame 3 is fixedly connected with a fixed ring 8, and the upper and lower two horizontal inner frames 3 are symmetrically arranged; the outer frame 1 is detachably inserted with a fixed shaft 9 at the position corresponding to the fixed ring 8. The cooperation between the fixed shaft 9 and the fixed ring 8 can make the rectangular frame composed of the horizontal inner frame 3 and the vertical inner frame 2 rotatably connected inside the outer frame 1, and the handle can make it open and close, which is convenient for the owner to use.

[0046] The fixed shaft 9 is provided with a insertion hole 911; the bottom and the upper part of the outer frame 1 are fixedly provided with a first shell 912 at the position corresponding to the fixed shaft 9; the first insertion rod 913 is slidably connected inside the first shell 912, and the outer diameter of the end of the first insertion rod 913 is the same as the inner diameter of the insertion hole 911; the side of the first insertion rod 913 close to the insertion hole 911 is fixedly connected with an annular block 914, and the first insertion rod 913 is provided with a spring 915 at the position corresponding to the annular block 914, one end of the spring 915 is connected with the annular block 914, and the other end is connected with the end of the first shell 912 close to the insertion hole 911, which is used to push the first insertion rod 913 away from the insertion hole 911.

[0047] A plurality of first protrusions 916 are fixedly arranged on the side of the first insertion rod 913 away from the fixed shaft 9; a sleeve 917 is rotatably connected to the first insertion rod 913 at the position corresponding to the first protrusion 916; the sleeve 917 is provided with a first sliding groove 918; the width of the first sliding groove 918 is the same as the width of the first protrusion 916; a first knob 919 is fixedly connected to the end of the sleeve 917 away from the fixed shaft 9; the first knob 919 is protruded below the lower part of the first shell 912 (here, the position is described with reference to Figure 5 , which is used to limit the position of the first knob 919.

[0048] During the installation of the screen fan, first, the two vertical inner frames 2 and one horizontal inner frame 3 are connected by the bolt 12, then the fixed rods 4 on both sides of the screen 5 are inserted into the corresponding vertical inner frames 2 from top to bottom, so that the screen 5 is unfolded between the vertical inner frames 2 from the cutout 6, and is tensioned by the wedge-shaped block 10, the bottom of the fixed rod 4 is inserted into the bottom horizontal inner frame 3, and then another horizontal inner frame 3 is installed on the upper part of the vertical inner frame 2 by the bolt 12, thereby completing the installation of the screen 5.

[0049] Afterwards, the frame body (screen fan assembly) composed of two vertical inner frames 2, two horizontal inner frames 3 and one screen 5 is placed inside the outer frame 1, and the screen fan assembly is rotatably arranged inside the outer frame 1 by the cooperation of the fixing shaft 9 and the fixing ring 8, thereby completing the replacement and maintenance of the screen 5.

[0050] In order to quickly and conveniently remove the screen fan assembly, the fixing shaft 9 is detachable, and by pushing the first insertion rod 913 away from one end of the fixing shaft 9, the other end is inserted into the insertion hole 911 of the fixing shaft 9, thereby quickly fixing the fixing shaft 9, which is convenient for the owner to operate, simple and convenient. Afterwards, by rotating the first knob 919, the initial position of the knob is changed, so that the position of the first sliding groove 918 and the first protrusion 916 is staggered. Since the position of the first knob 919 is limited by the first shell 912, the first insertion rod 913 cannot move under the action of the spring 915. At this time, the position of the first insertion rod 913 is fixed, and since the initial position of each first knob 919 (i.e. the position where the first sliding groove 918 and the first protrusion 916 correspond) is only known by the owner, even if the fixing structure of the external screen fan is simple and convenient to disassemble and maintain, only the owner can disassemble and remove it, which has a simple anti-theft function (to prevent the screen fan from being stolen). For a large number of houses with low floors, the safety is higher.

[0051] When disassembling the screen fan, the owner adjusts each first knob 919 to the initial position, so that the positions of all first sliding grooves 918 and all first protrusions 916 correspond, and under the cooperation of the spring 915 and the annular block 914, the first insertion rod 913 is automatically pushed to move, so that it is separated from the insertion hole 911, and then the fixing shaft 9 is separated from the fixing ring 8, so that the screen fan can be removed. Thereafter, the screen 5 can be removed by loosening the bolts 12 in sequence, which is convenient and fast to disassemble.

[0052] Example two: please refer to Figure 7 , Figure 8 and Figure 9As shown, the bottom and upper part of the outer frame 1 are fixedly provided with a second housing 921 corresponding to the position of the fixing shaft 9; a second insertion rod 929 is slidably connected inside the second housing 921, both ends of the second insertion rod 929 penetrate through the second housing 921; a groove 923 is arranged symmetrically on the second insertion rod 929; a second lug 922 is fixedly connected at the connection between the second housing 921 and the second insertion rod 929, the width of the second lug 922 is equal to the width of the groove 923, which is used to prevent the second insertion rod 929 from rotating; a plurality of annular grooves 924 are arranged uniformly on the second insertion rod 929 corresponding to the position between both ends of the second housing 921; a second knob 925 is rotatably connected to the second insertion rod 929 corresponding to the position of the annular groove 924; a third lug 926 is fixedly connected symmetrically on the second knob 925, the width of the third lug 926 is the same as the width of the groove 923; a limiting tube 927 is sleeved on the second insertion rod 929 corresponding to the position on both sides of the second knob 925, which is used to limit the position of the second knob 925; an end block 928 is fixedly connected to the end of the second insertion rod 929 away from the fixing shaft 9, which is convenient for users to place the position of the second insertion rod 929.

[0053] In specific use, after the second insertion rod 929 is inserted into the insertion hole 911 on the fixing shaft 9, the initial position of each second knob 925 is adjusted, the position of each second knob 925 in the annular groove 924 is changed, the position of the third lug 926 and the groove 923 is staggered, thereby limiting the movement of the insertion rod, achieving the purpose of locking the insertion rod, realizing the quick fixing of the screen fan, and vice versa.

[0054] The fixing shaft 9 is fixedly connected with a positioning block 13; the outer frame 1 is provided with a matching positioning groove corresponding to the position of the positioning block 13, which is used to assist users to align the insertion hole 911 with the first insertion rod 913 or the second insertion rod 929.

[0055] It should be noted that, in this text, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0056] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A fixing device for a detachable external screen fan, characterized in that: Includes an outer frame (1) fixed outside the window, the cross-section of which is L-shaped; a screen assembly is provided inside the outer frame (1), the screen assembly is composed of two vertical inner frames (2), two horizontal inner frames (3) and a screen (5), the horizontal inner frames (3) and the vertical inner frames (2) are combined to form a rectangular shape; The cross-sections of the vertical inner frame (2) and the horizontal inner frame (3) are both rectangular, and both ends are 45° chamfered structures that fit each other. The inner middle of the vertical inner frame (2) and the horizontal inner frame (3) are both provided with cuts (6). The mesh (5) is fixed with fixing rods (4) on both sides corresponding to the position of the vertical inner frame (2). The fixing rods (4) are long rod structures with rectangular cross-sections. A fixing ring (8) is fixedly connected to the lower surface of the corner of the horizontal inner frame (3), and the upper and lower horizontal inner frames (3) are symmetrically arranged; a fixing shaft (9) is detachably inserted into the outer frame (1) corresponding to the position of the fixing ring (8); a fixing component is provided in the outer frame (1) corresponding to the position of the fixing shaft (9); the fixing component includes a hole (911) opened on the fixing shaft (9). The fixing assembly also includes a first housing (912) fixedly disposed at the bottom and top of the outer frame (1); a first insert rod (913) is slidably connected inside the first housing (912), the outer diameter of the end of the first insert rod (913) is the same as the inner diameter of the insertion hole (911); an annular block (914) is fixedly connected to the side of the first insert rod (913) near the insertion hole (911), and a spring (915) is sleeved on the first insert rod (913) corresponding to the position of the annular block (914), one end of the spring (915) is connected to the annular block (914), and the other end is connected to the end of the first housing (912) near the insertion hole (911); On the side of the first insertion rod (913) away from the fixed shaft (9), a plurality of first protrusions (916) are fixedly connected at equal intervals; the first insertion rod (913) is rotatably connected to the first protrusions (916) at the position of each first protrusion (916); a first sliding groove (918) is provided on the sleeve (917); a first knob (919) is fixedly connected to the end of the sleeve (917) away from the fixed shaft (9); the lower part of the first knob (919) protrudes from the lower part of the first housing (912).

2. The fixing device for a detachable external screen fan according to claim 1, characterized in that: Push one end of the first insert rod (913) away from the fixed shaft (9) so that the other end is inserted into the insertion hole (911) on the fixed shaft (9). Then, by rotating the first knob (919), the initial position of the first knob (919) is changed, so that the positions of the first slide (918) and the first protrusion (916) are misaligned. The position of the first knob (919) is restricted by the first housing (912), and the first insert rod (913) cannot move under the action of the spring (915). At this time, the position of the first insert rod (913) is fixed.

3. A fixing device for a detachable external screen fan, characterized in that: Includes an outer frame (1) fixed outside the window, the cross-section of which is L-shaped; a screen assembly is provided inside the outer frame (1), the screen assembly is composed of two vertical inner frames (2), two horizontal inner frames (3) and a screen (5), the horizontal inner frames (3) and the vertical inner frames (2) are combined to form a rectangular shape; The cross-sections of the vertical inner frame (2) and the horizontal inner frame (3) are both rectangular, and both ends are 45° chamfered structures that fit each other. The inner middle of the vertical inner frame (2) and the horizontal inner frame (3) are both provided with cuts (6). The mesh (5) is fixed with fixing rods (4) on both sides corresponding to the position of the vertical inner frame (2). The fixing rods (4) are long rod structures with rectangular cross-sections. A fixing ring (8) is fixedly connected to the lower surface of the corner of the horizontal inner frame (3), and the upper and lower horizontal inner frames (3) are symmetrically arranged; a fixing shaft (9) is detachably inserted into the outer frame (1) corresponding to the position of the fixing ring (8); a fixing component is provided in the outer frame (1) corresponding to the position of the fixing shaft (9); the fixing component includes a hole (911) opened on the fixing shaft (9). The fixing assembly also includes a second housing (921) fixedly disposed at the bottom and top of the outer frame (1); a second insert rod (929) is slidably connected inside the second housing (921), and both ends of the second insert rod (929) penetrate through the second housing (921); symmetrically arranged grooves (923) are provided on the second insert rod (929); a second protrusion (922) is fixedly connected at the connection between the second housing (921) and the second insert rod (929). The second insert (929) has a plurality of annular grooves (924) evenly distributed between the two ends of the second housing (921); the second insert (929) is rotatably connected to a second knob (925) corresponding to the position of the annular groove (924); and the second knob (925) is fixedly connected to a symmetrically arranged third protrusion (926). The second insert (929) is fitted with a limiting tube (927) on both sides of the second knob (925), which is used to limit the position of the second knob (925); the end of the second insert (929) away from the fixed shaft (9) is fixed with an end block (928).

4. A fixing device for a detachable external screen fan according to claim 1 or 3, characterized in that: Inside the vertical inner frame (2), wedge-shaped blocks (10) are fixed at positions corresponding to the two sides of the cut (6). The narrower end of the wedge-shaped block (10) is located at the top, and the wider end is located at the bottom.

5. A fixing device for a detachable external screen fan according to claim 1 or 3, characterized in that: The vertical inner frame (2) and the horizontal inner frame (3) are respectively fixed with solid blocks (7) of matching shape at the connection positions; the vertical inner frame (2) and the horizontal inner frame (3) are provided with countersunk grooves (11) at the positions corresponding to the 45° chamfered slope; the countersunk grooves (11) are provided with bolts (12), and the horizontal inner frame (3) and the vertical inner frame (2) are connected by bolts (12) to form a rectangular shape.

6. A fixing device for a detachable external screen fan according to claim 1 or 3, characterized in that: A positioning block (13) is fixedly connected to the fixed shaft (9); the outer frame (1) has a positioning groove that matches the position of the positioning block (13).

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