Adjustable ventilation device for boiler room of heat source plant

Abstract

The present application relates to the technical field of ventilation device, and discloses a kind of adjustable ventilation device for boiler room of heat source factory, including installation frame and the ventilation shell being arranged in the inside of installation frame, the inside of ventilation shell is provided with ventilation structure, the air outlet end of ventilation shell is rotatably installed with several linear array distribution's strut, the outer wall of strut is fixed with louvre, one end of strut passes through the side of ventilation shell, both sides of ventilation shell are fixedly installed with connecting shell.The ventilation fan blade of the present application is driven control assembly by linkage assembly when operating, so that the opening angle of louvre changes with fan blade speed in real time, the faster the speed, the greater the opening angle, the greater the ventilation volume, otherwise, it is smaller.This kind of automatic adjustment function can flexibly adapt to the ventilation demand of different working conditions of boiler room, without manual intervention, both avoid the influence of air volume on ventilation effect, and prevent the energy waste caused by excess air volume, realize the unity of practicality and energy saving.

Description

Technical Field

[0001] This invention relates to the field of ventilation equipment technology, and in particular to an adjustable ventilation device for boiler rooms in heat source plants. Background Technology

[0002] Ventilation devices for boiler rooms in heat source plants refer to those installed around the boiler room building and furnace body in heat source plants, specifically designed to achieve ventilation and heat dissipation, dust removal and odor removal, flue gas exhaust, and exhaust in case of gas leaks, while meeting the requirements for indoor ventilation, safe production, explosion prevention, and occupational health conditions.

[0003] Currently, the adjustable ventilation devices used in existing boiler rooms generally employ only two methods for opening and closing louvers: gravity-driven self-closing or electric drive control. Gravity-driven louvers rely solely on their own weight to open and close, and cannot adaptively adjust their opening based on the fan speed and air volume. While electric control louvers can achieve active opening and closing adjustment, they are mostly independent control systems that cannot be linked and matched with the fan speed. This makes it difficult to adjust the louver opening and closing amplitude in real time according to actual ventilation volume and air pressure changes, which can easily lead to air volume imbalance, increased airflow resistance, and poor ventilation. This reduces the overall ventilation, heat dissipation, and dust removal efficiency of the boiler room, and also fails to meet the dynamic ventilation needs of the boiler room under different load conditions.

[0004] Therefore, it is necessary to design an adjustable ventilation device for boiler rooms in heat source plants to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an adjustable ventilation device for boiler rooms in heat source plants.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable ventilation device for a boiler room in a heat source plant includes a mounting frame and a ventilation housing disposed inside the mounting frame. A ventilation structure is provided inside the ventilation housing. A plurality of support rods arranged in a linear array are rotatably mounted at the air outlet end of the ventilation housing. Louvers are fixedly fitted onto the outer wall of each support rod. One end of each support rod passes through the side of the ventilation housing. Connecting shells are fixedly mounted on both sides of the ventilation housing. Shafts are fixedly mounted on both inner walls of the mounting frame. The ends of the shafts pass through the inner walls of the connecting shells and are rotatably connected to them. A control component for controlling the opening and closing of the plurality of louvers is provided inside one of the connecting shells. A linkage component for controlling the opening and closing angle of the louvers according to the rotational speed of the ventilation structure is provided between the ventilation structure and the control component. A swing component for linking the ventilation housing to swing for ventilation inside the mounting frame is provided between the linkage component and one shaft. The control component includes a drive collar fixedly fitted on the topmost support rod located at one end of the ventilation housing. The ends of the remaining support rods are all fixedly fitted with fixed collars. A lever is fixedly installed on the outer wall of several fixed collars and the drive collar. A transmission bar is rotatably installed on the end of several levers.

[0007] As a preferred embodiment of the present invention, the ventilation structure includes a ventilation fan blade rotatably mounted on the inner wall of the ventilation housing via a bracket, and a drive motor for driving the ventilation fan blade to rotate is fixedly installed at one corner of the inner wall of the ventilation housing.

[0008] As a preferred embodiment of the present invention, a protective net is fixedly installed at the air inlet end of the ventilation housing, and a U-shaped shield is provided between the mounting frame and the ventilation housing.

[0009] As a preferred embodiment of the present invention, the control component further includes a drive bar fixedly installed on the outer wall of the drive collar, and a torsion spring is fitted on the topmost support rod, with the two ends of the torsion spring being fixedly connected to the ventilation housing and the drive collar, respectively.

[0010] As a preferred embodiment of the present invention, the lever is tilted downwards when the louvers are closed.

[0011] As a preferred embodiment of the present invention, the linkage component includes a drive shaft rotatably mounted on the inner wall of the ventilation housing and located directly below the ventilation fan blades. A drive bevel gear is fixedly mounted at the end of the drive shaft. A transmission shaft is provided through the inner wall of the ventilation housing. A driven bevel gear meshing with the drive bevel gear is fixedly mounted at the end of the transmission shaft. A sensing structure corresponding to the drive bar is provided on the inner side of the connecting shell.

[0012] As a preferred embodiment of the present invention, the sensing structure includes a linkage disk rotatably mounted on the side of the ventilation housing. The outer wall of the linkage disk has a plurality of mounting grooves arranged in a circular array. A sliding plate is slidably mounted on the inner wall of the mounting groove. An arc plate is fixedly mounted at one end of the sliding plate. A spring is fixedly mounted between the other end of the sliding plate and the inner wall of the mounting groove.

[0013] As a preferred embodiment of the present invention, the drive shaft and the ventilation fan blades are connected by a driven wheel and a synchronous belt, and a protective shell for protecting the driven bevel gear and the drive bevel gear is fixedly installed on the inner wall of the ventilation housing.

[0014] As a preferred embodiment of the present invention, the drive bar is always in contact with the outer wall of the arc plate under the action of the torsion spring.

[0015] As a preferred embodiment of the present invention, the swing assembly includes a fixed gear fixedly installed on one end of a shaft located inside the connecting housing, a rotating rod rotatably installed on the side of the ventilation housing, an swing half gear meshing with the fixed gear fixedly installed at the end of the rotating rod, a torsion spring II fitted on the outer wall of another shaft, and the two ends of the torsion spring II being fixedly connected to the shaft and the inner wall of the connecting housing, respectively. The transmission shaft, the linkage disc and the rotating rod are connected by a transmission belt and a pulley.

[0016] The present invention has the following beneficial effects: 1. After the device of the present invention is started, the drive motor drives the ventilation fan blades to rotate at high speed, and uses the air pressure difference to quickly discharge the high temperature and harmful gases in the boiler room, while introducing fresh air to achieve efficient ventilation, ensuring that the air environment inside the boiler room meets the safety production standards, avoiding safety hazards caused by air pollution and the accumulation of harmful gases from the source, providing a safe working environment for the staff, and ensuring the orderly production. 2. When the ventilation fan blades of the present invention are running, the linkage component drives the control component, so that the opening and closing angle of the louvers changes in real time with the fan blade speed. The faster the speed, the larger the opening and closing angle and the greater the ventilation volume, and vice versa. This automatic adjustment function can flexibly adapt to the ventilation needs of different working conditions in the boiler room without manual intervention. It avoids the ventilation effect caused by insufficient air volume and prevents the energy waste caused by excessive air volume, thus achieving a unity of practicality and energy saving. 3. This invention uses a linkage component and a swing component to make the ventilation housing swing back and forth around the shaft, breaking the limitations of traditional fixed ventilation and achieving large-scale, multi-angle ventilation. This effectively improves the uniformity of ventilation inside the boiler room and avoids the problem of insufficient ventilation in local areas. At the same time, the flexible cover between the mounting frame and the ventilation housing not only seals the gaps to prevent air leakage and the entry of debris, but also does not hinder the swing of the housing, ensuring the stable and efficient operation of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the louver side structure of the mounting frame of an adjustable ventilation device for a boiler room in a heat source plant, as proposed in this invention. Figure 2 This is a schematic diagram of the protective netting side structure of the mounting frame of an adjustable ventilation device for a boiler room in a heat source plant, as proposed in this invention. Figure 3 This is a schematic diagram of the structure of an adjustable ventilation device for boiler rooms in heat source plants, where the ventilation shell is located inside the protective netting, as proposed in this invention. Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5This is an exploded structural diagram of the mounting frame, ventilation housing, and one-side connecting shell of an adjustable ventilation device for boiler rooms in heat source plants, as proposed in this invention. Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 This is an exploded structural diagram of the mounting frame, ventilation shell, and two side connecting shells of an adjustable ventilation device for a boiler room in a heat source plant, as proposed in this invention. Figure 8 This is an exploded view of the linkage structure of an adjustable ventilation device for a boiler room in a heat source plant, as proposed in this invention.

[0018] In the diagram: 1. Mounting frame; 2. Ventilation housing; 3. Connecting housing; 4. Shaft; 5. Ventilation fan blades; 51. Drive motor; 52. Support rod; 53. Louver blades; 54. Protective netting; 6. Control components; 61. Fixed collar; 62. Lever; 63. Drive collar; 64. Transmission bar; 65. Drive bar; 66. Torsion spring one; 7. Linkage assembly; 71. Drive shaft; 72. Drive bevel gear; 73. Transmission shaft; 74. Driven bevel gear; 75. Linkage disc; 76. Mounting slot; 77. Slide plate; 78. Arc plate; 79. Spring; 8. Swing assembly; 81. Fixed gear; 82. Rotating rod; 83. Swing half gear; 84. Torsion spring II; 9. Covering cloth; 10. Protective casing. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: This example discloses an adjustable ventilation device for a boiler room in a heat source plant, referring to... Figure 1-8The system includes a mounting frame 1 and a ventilation housing 2 located inside the mounting frame 1. The ventilation housing 2 has a ventilation structure inside, including a fan blade 5 rotatably mounted on the inner wall of the ventilation housing 2 via a bracket. A drive motor 51 for driving the fan blade 5 is fixedly mounted at one corner of the inner wall of the ventilation housing 2. Several support rods 52 arranged in a linear array are rotatably mounted at the air outlet end of the ventilation housing 2. Louvers 53 are fixedly fitted onto the outer wall of the support rods 52. One end of each support rod 52 passes through the side of the ventilation housing 2. A protective net 54 is fixedly mounted at the air inlet end of the ventilation housing 2. The ventilation housing 2 has two... A connecting shell 3 is fixedly installed on each side. A shaft 4 is fixedly installed on the inner walls of both sides of the mounting frame 1. The end of the shaft 4 passes through the inner wall of the connecting shell 3 and is rotatably connected to the connecting shell 3. A control component 6 for controlling the opening and closing of several louvers 53 is provided on the inner side of one connecting shell 3. A linkage component 7 for controlling the opening and closing angle of the louvers 53 according to the rotation speed of the ventilation structure is provided between the ventilation structure and the control component 6. A swing component 8 for linking the ventilation housing 2 to swing and ventilate inside the mounting frame 1 is provided between the linkage component 7 and one shaft 4. A U-shaped cover 9 is provided between the mounting frame 1 and the ventilation housing 2.

[0021] The implementation principle of this embodiment is as follows: In actual use, the ventilation device requires the operator to first install the mounting frame 1 to the designated ventilation position in the boiler room of the heat source plant, ensuring that the mounting frame 1 is firmly fixed and tightly fitted to the ventilation area. Then, the entire ventilation device is powered on to complete all preparations before the device is started. After power is supplied, the drive motor 51 inside the device starts immediately, generating driving force on the ventilation fan blades 5, causing the ventilation fan blades 5 to rotate at high speed. The air pressure difference generated by the rotation of the fan blades is used to expel the high temperature and harmful gases inside the boiler room in a timely manner, while introducing fresh air from the outside, achieving efficient ventilation and air exchange inside the boiler room, and ensuring that the air environment inside the boiler room meets the safety production standards. Meanwhile, as the drive motor 51 starts and drives the ventilation fan blades 5 to operate, the ventilation fan blades 5 will synchronously drive the control component 6 through the linkage component 7, causing the support rod 52 on the inner side of the air outlet of the ventilation housing 2 to rotate, which in turn drives the louver 53 connected to it to rotate synchronously. It is worth noting that the rotation opening angle of the louver 53 is not fixed, but is controlled in real time by the rotation speed of the ventilation fan blades 5. The faster the fan blade speed, the larger the opening angle of the louver 53, and the greater the ventilation volume. When the fan blade speed slows down, the opening angle of the louver 53 decreases accordingly, and the ventilation volume also decreases accordingly. This realizes the automatic adjustment function of air volume, which can not only meet the ventilation needs of the boiler room under different working conditions, but also effectively save energy. Furthermore, during the continuous operation of the ventilation fan blade 5, the linkage component 7 and the swing component 8 work together to drive the ventilation housing 2 to swing back and forth around the shaft 4 inside the mounting frame 1 as the rotation center. This breaks the limitations of traditional fixed ventilation and realizes multi-angle, large-range swing ventilation, improving the uniformity and overall efficiency of ventilation inside the boiler room. To ensure ventilation effect and prevent air leakage, a U-shaped shielding cloth 9 is set between the mounting frame 1 and the ventilation housing 2. The shielding cloth 9 is made of flexible fabric, which can not only effectively seal the gap between the mounting frame 1 and the ventilation housing 2 to prevent external debris from entering the device or the boiler room, but also has good flexibility and will not hinder the normal swing of the ventilation housing 2 inside the mounting frame 1, ensuring that all components of the device operate in coordination and stably perform the ventilation function.

[0022] Example 2: Based on Example 1, this example discloses an adjustable ventilation device for boiler rooms in heat source plants, such as... Figure 5 and Figure 6 As shown, the control component 6 includes a drive collar 63 fixedly mounted on the topmost support rod 52 located at one end of the ventilation housing 2. The ends of the remaining support rods 52 are all fixedly mounted with fixed collars 61. Several fixed collars 61 and the outer wall of the drive collar 63 are all fixedly mounted with levers 62. The levers 62 are in an inclined downward state when the louvers 53 are closed. The ends of several levers 62 are rotatably mounted with transmission bars 64. The control component 6 also includes a drive bar 65 fixedly mounted on the outer wall of the drive collar 63. A torsion spring 66 is mounted on the topmost support rod 52. The two ends of the torsion spring 66 are fixedly connected to the ventilation housing 2 and the drive collar 63, respectively.

[0023] The implementation principle of this embodiment is as follows: During normal operation, the rotational power of the ventilation fan blade 5 is transmitted to the drive bar 65 through the linkage component 7, which causes a prying action on the drive bar 65. When the drive bar 65 is pryed and displaced by the linkage component 7, it will synchronously drive the drive collar 63 connected to it to rotate. Since the levers 62 in the device are flexibly rotated through the transmission bar 64, and one end of the lever 62 is fixed to the drive collar 63 and the fixed collar 61, when the drive collar 63 starts to rotate under the drive of the drive bar 65, the lever 62 connected to its surface will rotate synchronously. At the same time, through the power transmission of the transmission bar 64, all other levers 62 and the corresponding fixed collar 61 will rotate synchronously. The rotation of lever 62 and fixed collar 61 directly acts on several support rods 52 connected to them, causing all support rods 52 to rotate synchronously and in the same direction. The rotation of support rods 52 further drives several louvers 53 connected to them, realizing the synchronous opening and closing of all louvers 53. In addition, under the precise control of linkage component 7, the rotation speed of ventilation fan blade 5 will correspond to the opening and closing angle of louvers 53. That is, the speed change of ventilation fan blade 5 can directly control the size of the opening and closing angle of louvers 53, thereby realizing flexible adjustment of ventilation volume according to actual ventilation needs.

[0024] Example 3: Based on Example 2, this example discloses an adjustable ventilation device for boiler rooms in heat source plants, such as... Figure 3 , Figure 4 and Figure 8 As shown, the linkage component 7 includes a drive shaft 71 rotatably mounted on the inner wall of the ventilation housing 2 and located directly below the ventilation fan blade 5. The drive shaft 71 and the ventilation fan blade 5 are connected by a driven wheel and a synchronous belt. A drive bevel gear 72 is fixedly mounted at the end of the drive shaft 71. A transmission shaft 73 is provided through the inner wall of the ventilation housing 2. A driven bevel gear 74 that meshes with the drive bevel gear 72 is fixedly mounted at the end of the transmission shaft 73. A sensing structure corresponding to the drive bar 65 is provided on the inner side of the connecting housing 3. The sensing structure includes a linkage disk 75 rotatably mounted on the side of the ventilation housing 2. The outer wall of the linkage disk 75 has several mounting slots 76 arranged in a ring array. A sliding plate 77 is slidably mounted on the inner wall of the mounting slot 76. An arc plate 78 is fixedly mounted at the end of the sliding plate 77. The drive bar 65 is always in contact with the outer wall of the arc plate 78 under the action of the torsion spring 66. A spring 79 is fixedly mounted between the other end of the sliding plate 77 and the inner wall of the mounting slot 76. A protective shell 10 for protecting the driven bevel gear 74 and the drive bevel gear 72 is fixedly mounted on the inner wall of the ventilation housing 2.

[0025] The implementation principle of this embodiment is as follows: When the ventilation fan blade 5 starts to rotate, it forms a stable transmission structure through the driven wheel and synchronous belt connected to it, thereby driving the drive shaft 71 to rotate synchronously. The rotation of the drive shaft 71 is directly transmitted to the drive bevel gear 72 fixedly connected to it. Through the meshing of the drive bevel gear 72 and the driven bevel gear 74, the power is smoothly transmitted to the transmission shaft 73, realizing the synchronous rotation of the transmission shaft 73 and the ventilation fan blade 5. During the rotation of the drive shaft 73, the linkage disk 75 will rotate synchronously. When the linkage disk 75 is initially stationary, the slide plate 77 is stably located inside the mounting groove 76 under the elastic preload of the spring 79. The arc plate 78 connected to the slide plate 77 always remains in close contact with the outer wall of the linkage disk 75. At the same time, the drive bar 65 is always in contact with the outer wall of the arc plate 78 under the elastic force of the torsion spring 66. In this initial state, the louver 53 is in a fully closed state, which can effectively prevent external debris and dust from entering the equipment. When the linkage disc 75 starts to rotate with the drive shaft 73, its rotation speed is synchronized with the rotation speed of the ventilation fan blade 5. Under different rotation speed conditions, the slide plate 77 and the arc plate 78 will be subjected to centrifugal forces of different magnitudes. When the centrifugal force reaches a certain value, it will overcome the elastic constraint force of the spring 79 and push the slide plate 77 and the arc plate 78 to slide outward from the inside of the mounting groove 76. During the sliding process, the arc plate 78 will generate a stable thrust on the drive bar 65 that is always in contact with its outer wall. Thus, through the force movement of the drive bar 65, the synchronous drive of the drive bar 65 and the drive collar 63 is realized, providing power support for the opening and closing adjustment of the louver blade 53.

[0026] Example 4: Based on Example 3, this example discloses an adjustable ventilation device for boiler rooms in heat source plants, such as... Figure 5 and Figure 7 As shown, the swing assembly 8 includes a fixed gear 81 fixedly installed on one end of a shaft 4 located inside the connecting shell 3. A rotating rod 82 is rotatably installed on the side of the ventilation shell 2. A swing half gear 83 that meshes with the fixed gear 81 is fixedly installed at the end of the rotating rod 82. A torsion spring 84 is fitted on the outer wall of another shaft 4, and the two ends of the torsion spring 84 are fixedly connected to the shaft 4 and the inner wall of the connecting shell 3, respectively. The transmission shaft 73, the linkage disc 75 and the rotating rod 82 are connected by a transmission belt and a pulley.

[0027] The implementation principle of this embodiment is as follows: During equipment operation, the drive shaft 73, as the core power transmission component, rotates stably at a preset speed. Its rotational power, through the transmission belt and pulley, drives the linkage disc 75 and the rotating rod 82 to rotate synchronously. During the rotation of the rotating rod 82, the oscillating half-gear 83 fixedly mounted on its surface rotates synchronously with it. Since the oscillating half-gear 83 is meshed with the fixed gear 81, when the teeth on the oscillating half-gear 83 mesh with the teeth on the fixed gear 81, a meshing force is generated. This force drives the oscillating half-gear 83... The connected ventilation housing 2, with the shaft 4 as the rotation center, swings directionally within the inner wall of the mounting frame 1. When the swing half gear 83 rotates until its teeth completely separate from the teeth on the fixed gear 81, the meshing force disappears. At this time, the torsion spring 84 installed at the shaft 4 releases its elastic potential energy, generating a reverse restoring force, which drives the ventilation housing 2 to swing in the opposite direction. This cycle repeats, achieving continuous reciprocating swinging motion of the ventilation housing 2, effectively expanding the coverage area of ​​the ventilation zone, improving the uniformity and comprehensiveness of ventilation, and ensuring that the ventilation effect of the equipment meets the design standards.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable ventilation device for a boiler room in a heat source plant, comprising a mounting frame (1) and a ventilation housing (2) disposed inside the mounting frame (1), wherein a ventilation structure is provided on the inner side of the ventilation housing (2), and a plurality of support rods (52) arranged in a linear array are rotatably mounted on the air outlet end of the ventilation housing (2), wherein louvers (53) are fixedly fitted on the outer wall of the support rods (52), and one end of the support rods (52) passes through the side of the ventilation housing (2), characterized in that, Connecting shells (3) are fixedly installed on both sides of the ventilation housing (2), and shafts (4) are fixedly installed on both sides of the mounting frame (1). The end of the shaft (4) passes through the inner wall of the connecting shell (3) and is rotatably connected to the connecting shell (3). A control component (6) for controlling the opening and closing of several louvers (53) is provided on the inner side of one of the connecting shells (3). A linkage component (7) for controlling the opening and closing angle of the louvers (53) according to the rotation speed of the ventilation structure is provided between the ventilation structure and the control component (6). A swing component (8) for swinging the ventilation housing (2) inside the mounting frame (1) for ventilation is provided between the linkage component (7) and one shaft (4). The control component (6) includes a drive collar (63) fixedly fitted on the topmost support rod (52) at one end of the ventilation housing (2) outside. The ends of the remaining support rods (52) are all fixedly fitted with fixed collars (61). A lever (62) is fixedly installed on the outer wall of several fixed collars (61) and drive collars (63). A transmission bar (64) is rotatably installed on the end of several levers (62). The control assembly (6) also includes a drive bar (65) fixedly installed on the outer wall of the drive collar (63), and a torsion spring (66) is fitted on the topmost support rod (52). The two ends of the torsion spring (66) are fixedly connected to the ventilation housing (2) and the drive collar (63) respectively. The ventilation structure includes a ventilation fan blade (5) that is rotatably mounted on the inner wall of the ventilation housing (2) via a bracket, and a drive motor (51) for driving the ventilation fan blade (5) to rotate is fixedly installed at one corner of the inner wall of the ventilation housing (2). The linkage component (7) includes a drive shaft (71) rotatably mounted on the inner wall of the ventilation housing (2) and located directly below the ventilation fan blade (5). A drive bevel gear (72) is fixedly mounted at the end of the drive shaft (71). A transmission shaft (73) is provided through the inner wall of the ventilation housing (2). A driven bevel gear (74) meshing with the drive bevel gear (72) is fixedly mounted at the end of the transmission shaft (73). A sensing structure corresponding to the drive bar (65) is provided on the inner side of the connecting shell (3). The sensing structure includes a linkage disk (75) rotatably mounted on the side of the ventilation housing (2). The outer wall of the linkage disk (75) is provided with a plurality of mounting slots (76) arranged in a ring array. A sliding plate (77) is slidably mounted on the inner wall of the mounting slot (76). An arc plate (78) is fixedly mounted on the end of the sliding plate (77). A spring (79) is fixedly mounted between the other end of the sliding plate (77) and the inner wall of the mounting slot (76).

2. The adjustable ventilation device for boiler rooms in heat source plants according to claim 1, characterized in that, A protective net (54) is fixedly installed at the air inlet end of the ventilation housing (2), and a square-shaped cover (9) is provided between the mounting frame (1) and the ventilation housing (2).

3. The adjustable ventilation device for boiler rooms in heat source plants according to claim 1, characterized in that, The lever (62) is tilted downwards when the louvers (53) are closed.

4. The adjustable ventilation device for boiler rooms in heat source plants according to claim 1, characterized in that, The drive shaft (71) and the ventilation fan blade (5) are connected by a driven wheel and a synchronous belt. The inner wall of the ventilation housing (2) is fixedly equipped with a protective shell (10) for protecting the driven bevel gear (74) and the drive bevel gear (72).

5. An adjustable ventilation device for a boiler room in a heat source plant according to claim 1, characterized in that, The drive bar (65) is always in contact with the outer wall of the arc plate (78) under the action of the torsion spring (66).

6. An adjustable ventilation device for a boiler room in a heat source plant according to claim 1, characterized in that, The swing assembly (8) includes a fixed gear (81) fixedly installed on one end of a shaft (4) located inside the connecting shell (3). A rotating rod (82) is rotatably installed on the side of the ventilation shell (2). A swing half gear (83) meshing with the fixed gear (81) is fixedly installed at the end of the rotating rod (82). A torsion spring (84) is fitted on the outer wall of another shaft (4). The two ends of the torsion spring (84) are fixedly connected to the shaft (4) and the inner wall of the connecting shell (3), respectively. The transmission shaft (73), the linkage disc (75) and the rotating rod (82) are connected by a transmission belt and a pulley.

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