A ventilation device for a dust-free workshop

Abstract

The present invention discloses a ventilation device for a dust-free workshop, comprising a shell, an air duct for ventilation is provided in the middle of the shell, and protective nets are installed at both ends of the air duct; a fan is arranged on one side of the air duct and fixedly connected to the inner wall of the air duct; a constant temperature component is arranged in the shell and used to adjust the ventilation temperature. The present invention relates to the technical field of dust-free workshops. The ventilation device for a dust-free workshop can use the air in the dust-free workshop to cool down or heat up the air in the air duct when the ventilation device is ventilating, by means of a heat exchange component, so as to improve the thermal energy utilization efficiency of the air in the dust-free workshop, thereby reducing the constant temperature cost of the constant temperature component, thereby reducing the cost of maintaining a constant temperature during ventilation operation of the ventilation device.

Description

Technical Field

[0001] The invention relates to the technical field of dust-free workshops, and in particular to a ventilation device used in dust-free workshops. Background Art

[0002] A dust-free workshop (also called a clean room) is a strictly designed enclosed space that is specifically designed to control environmental conditions such as airborne particles, microorganisms, temperature and humidity. It is widely used in fields that require high environmental cleanliness, such as electronic manufacturing, pharmaceuticals, food processing, and biotechnology. Dust-free workshops usually need to maintain constant temperature and humidity to ensure the stability of materials during the production process. For example, during the manufacturing process of electronic components, excessive humidity may cause components to become damp and damaged.

[0003] In the prior art, automation equipment is sensitive to temperature and humidity, especially precision processing equipment and electronic equipment. Excessively high temperatures may cause equipment to overheat, affect production efficiency, and even cause malfunctions. Therefore, the ventilation system needs to effectively control the temperature of the workshop. Since ventilation is to exchange indoor air with outside air, and the outside air cannot maintain the same temperature as the indoor air, the outside air temperature needs to be adjusted during ventilation, and the indoor temperature cannot be used when it is discharged, which leads to an increase in energy consumption to maintain a constant temperature in the factory, thereby increasing the cost of using the factory.

[0004] Therefore, those skilled in the art provide a ventilation device for a dust-free workshop to solve the problems raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide a ventilation device for a dust-free workshop to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A ventilation device for a dust-free workshop comprises a shell, an air duct for ventilation is provided in the middle of the shell, and protective nets are installed at both ends of the air duct;

[0009] A fan is arranged on one side of the airway and fixedly connected to the inner wall of the airway;

[0010] A thermostatic component, which is disposed in the housing and is used to adjust the temperature of the ventilation;

[0011] The heat exchange component includes an expansion airbag, an air suction cavity is provided in the shell on the outside of the airway, an air inlet connected to the air suction cavity is provided on the outer wall of the shell on the side away from the fan, two groups of through grooves connected to the airway are provided at intervals on the side of the air suction cavity away from the air inlet, and the expansion airbags are fixedly connected to the inner wall of the airway on both sides of the through grooves;

[0012] A piston, a pressure chamber is provided in the housing between the airway and the suction chamber and between the two groups of through grooves, the piston is slidably arranged in the pressure chamber and is connected to the pressure chamber through a linear drive, and exhaust holes are provided on both sides of the pressure chamber and are connected to the expansion airbag;

[0013] A heat conducting plate, the inner wall of the airway is concave between the air suction cavity and the fan to form an expansion chamber, a pressure sensor for controlling the linear drive is fixedly connected in the expansion chamber, and a heat conducting plate is fixedly connected at the opening of the expansion chamber.

[0014] Furthermore, the exhaust hole is composed of a main hole and a branch hole. The main hole is opened on one side of the pressure chamber, and two groups of holes are opened at intervals on the side of the main hole away from the pressure chamber. The two groups of holes are respectively connected to the two expansion airbags on the same side.

[0015] Furthermore, the linear drive includes a motor and a screw. The motor is embedded in the inner wall of one side of the pressure chamber. The output shaft of the motor is fixedly connected to the screw. The screw passes through the piston and is rotatably connected to the inner wall of the other side of the pressure chamber. Sealing rings are fixedly connected on both sides of the piston at the point where the screw passes.

[0016] Furthermore, the thermostatic assembly includes a compressor, a heat exchanger and a four-way valve, and heat exchangers are arranged on both sides of the shell, the heat exchanger close to the fan side is installed at the bottom of the shell, and the heat exchanger away from the fan side is fixedly connected in the air duct, and two groups of pipelines for heat exchange medium circulation are arranged between the two heat exchangers;

[0017] One set of pipelines is fixedly connected to a compressor, and the other set of pipelines is fixedly connected to a four-way valve for changing the moving direction of the heat exchange medium.

[0018] Furthermore, a temperature sensor is fixedly connected in the air duct, and the temperature sensor is arranged on a side of the heat exchanger close to the fan.

[0019] Furthermore, a spoiler is fixedly connected in the air passage between the heat exchanger and the expansion airbag, and the spoiler is tiltedly arranged in the air passage.

[0020] Furthermore, a limit plate is fixedly connected to the inner wall of one side of the air duct close to the fan, a dust filter plate is clamped on the side of the limit plate away from the fan, and two handles for disassembly are symmetrically connected to the outer edge of the side wall of the dust filter plate.

[0021] Furthermore, a circular groove is provided on the outer peripheral wall of the dust filter plate, a clamping block is slidably arranged in the circular groove, and a supporting spring is fixedly arranged between the clamping block and the circular groove;

[0022] The side wall of the limiting plate is provided with an installation groove for installing the dust filter plate, and the inner wall of the installation groove is provided with a clamping groove for clamping the clamping block.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects:

[0024] 1. The ventilation device for a dust-free workshop can use the air in the dust-free workshop to cool down or heat up the air in the airway when the ventilation device is ventilating, by means of the heat exchange component, thereby improving the utilization efficiency of the heat energy of the air in the dust-free workshop, thereby reducing the constant temperature cost of the constant temperature component, and thus reducing the cost of maintaining a constant temperature during ventilation operation of the ventilation device;

[0025] 2. This ventilation device for a dust-free workshop can make the piston move faster by setting a linear drive, thereby increasing the deformation speed of the expansion airbag, allowing the outside air to mix better with the air in the dust-free workshop when entering the airway, and further improve the utilization rate of the air heat energy in the dust-free workshop, thereby further reducing the cost of maintaining a constant temperature for the ventilation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a ventilation device for a dust-free workshop of the present invention;

[0028] Figure 2 It is a schematic diagram of the internal structure of a ventilation device for a dust-free workshop of the present invention;

[0029] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0030] Figure 4 It is a schematic structural diagram of an exhaust hole in a ventilation device for a dust-free workshop according to the present invention;

[0031] Figure 5 It is a structural schematic diagram of a constant temperature component in a ventilation device for a dust-free workshop of the present invention;

[0032] Figure 6It is a structural schematic diagram of a dust filter plate in a ventilation device for a dust-free workshop according to the present invention;

[0033] Figure 7 It is a schematic structural diagram of an inflatable airbag in a ventilation device for a dust-free workshop of the present invention when inflated;

[0034] Figure 8 It is a schematic structural diagram of another group of inflatable airbags in a ventilation device for a dust-free workshop of the present invention when inflated.

[0035] In the figure, 1, shell; 2, fan; 3, constant temperature component; 31, compressor; 32, heat exchanger; 33, four-way valve; 4, heat exchange component; 41, expansion airbag; 42, piston; 43, heat conduction plate; 5, airway; 6, protective net; 7, suction chamber; 8, air inlet; 9, through groove; 10, pressure chamber; 11, linear drive; 111, motor; 112, screw rod; 113, sealing ring; 12, exhaust hole; 121, main hole; 122, branch hole; 13, expansion chamber; 14, pressure sensor; 15, temperature sensor; 16, spoiler; 17, limit plate; 18, dust filter plate; 19, handle; 20, round groove; 21, block; 22, support spring; 23, installation groove; 24, slot. DETAILED DESCRIPTION

[0036] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0037] Example:

[0038] Reference Figure 1 - Figure 8 The present invention discloses a ventilation device for a dust-free workshop, comprising a housing 1, an air duct 5 for ventilation is provided in the middle of the housing 1, and protective nets 6 are installed at both ends of the air duct 5;

[0039] The fan 2 is arranged on one side of the air duct 5 and is fixedly connected to the inner wall of the air duct 5;

[0040] A thermostatic component 3, which is arranged in the housing 1 and is used to adjust the ventilation temperature;

[0041] The heat exchange component 4 includes an expansion airbag 41, an air suction chamber 7 is provided in the shell 1 on the outside of the air passage 5, an air inlet 8 connected to the air suction chamber 7 is provided on the outer wall of the shell 1 on the side away from the fan 2, two groups of through grooves 9 connected to the air passage 5 are provided at intervals on the side of the air suction chamber 7 away from the air inlet 8, and the expansion airbags 41 are fixedly connected to the inner wall of the air passage 5 on both sides of the through grooves 9;

[0042] A piston 42 is provided in the housing 1 between the airway 5 and the suction chamber 7 and between the two groups of through grooves 9. The piston 42 is slidably disposed in the pressure chamber 10 and is connected to the pressure chamber 10 via a linear drive 11. Exhaust holes 12 communicating with the expansion airbag 41 are provided on both sides of the pressure chamber 10.

[0043] The heat conducting plate 43, the inner wall of the air duct 5 is located between the air suction cavity 7 and the fan 2 and is concave to form an expansion chamber 13, a pressure sensor 14 for controlling the linear drive 11 is fixedly connected in the expansion chamber 13, and a heat conducting plate 43 is fixedly connected at the opening of the expansion chamber 13.

[0044] In this embodiment, observe Figure 1 and Figure 2 It can be found that by opening an air duct 5 for ventilation in the shell 1, the dust-free workshop can be connected with the outside world, so that air can circulate and ventilate, and a fan 2 is fixedly connected to one side of the air duct 5. When the fan 2 is running, the gas in the air duct 5 can be accelerated to move in one direction, which can effectively improve the air ventilation efficiency in the dust-free workshop.

[0045] Since the temperature of the outside air and the air in the clean room cannot be kept the same, the air delivered to the clean room by fan 2 needs to be subjected to additional constant temperature treatment. Figure 2 It can be found that a constant temperature component 3 is provided in the shell 1, which is used to adjust the temperature of the gas entering the clean room. When the clean room is ventilated, the temperature in the room can be kept within a normal range, which can effectively prevent the machine from being in a high or low temperature environment and affecting its operation, thereby ensuring the operating stability of the machine in the clean room.

[0046] When there is a temperature difference between the outside air and the air in the clean room, the constant temperature component 3 needs to be used to treat the air at a constant temperature so that the air entering the clean room is consistent with the required temperature in the clean room. When the outside air enters, the air in the clean room will also be discharged, resulting in the direct discharge of the air with a temperature difference with the outside, which cannot be used, increasing the energy consumption of the clean room ventilation, thereby increasing the ventilation cost of the clean room.

[0047] So observe Figure 2It can be found that an air intake cavity 7 is provided on the outer side of the shell 1 located at the air duct 5, an air inlet 8 connected with the air intake cavity 7 is provided on the outer wall of the shell 1 on the side away from the fan 2, and finally a through groove 9 connected with the air duct 5 is provided on the side of the air intake cavity 7 away from the air inlet 8. At this time, when the air in the air duct 5 flows at a high speed, a negative pressure will be generated at the through groove 9, thereby generating a negative pressure in the air intake cavity 7, and the air in the dust-free workshop is sucked in through the air inlet 8, and then the air in the dust-free workshop enters the air duct 5 and mixes with the outside air, so that the air in the dust-free workshop is used to adjust the temperature of the outside air, so that the air in the air duct 5 is closer to the temperature in the dust-free workshop, thereby reducing the energy consumed by the constant temperature component 3 to adjust the temperature, and effectively reducing the cost of the constant temperature of the ventilation device.

[0048] As the temperature difference between the outside temperature and the temperature inside the clean room increases, when the power of the fan 2 remains unchanged and the air flow in the air duct 5 remains unchanged, the air flow in the clean room in the suction chamber 7 will not change, which will cause the cooling effect of the air in the clean room on the outside air to deteriorate, thereby increasing the constant temperature cost of the constant temperature component 3.

[0049] So observe Figure 2 - Figure 4 It can be found that the inner wall of the airway 5 is fixedly connected with an expansion airbag 41 on both sides of the through groove 9, and a pressure chamber 10 is provided between the airway 5 and the suction chamber 7 and between the two groups of through grooves 9 in the housing 1. Exhaust holes 12 connected to the expansion airbag 41 are provided on both sides of the pressure chamber 10. At the same time, a piston 42 is slidably arranged in the pressure chamber 10. Finally, a linear actuator 11 for driving the piston 42 to move is arranged in the pressure chamber 10, which can drive the piston 42 to move in the pressure chamber 10, so that the piston 42 presses the air on one side. The air is fed into the expansion airbag 41, which expands and deforms, thereby reducing the cross-sectional area of ​​the air passage 5. At this time, when the air flows through the expansion airbag 41, the flow rate will increase due to the reduction in cross-sectional area, so that the pressure at the opening of the through groove 9 at this location is further reduced, thereby further enhancing the suction force in the suction chamber 7, increasing the amount of air inhaled in the dust-free workshop in the air passage 5, and making the air mixing effect in the air passage 5 better, so as to improve the cooling efficiency, reduce the energy consumption of the constant temperature component 3, and ensure that the constant temperature cost of the ventilation device is effectively reduced.

[0050] An expansion chamber 13 is formed by forming an inner concave portion between the air intake chamber 7 and the fan 2 on the inner wall of the air duct 5. A pressure sensor 14 for controlling the linear actuator 11 is fixedly connected in the expansion chamber 13, and a heat conducting plate 43 is fixedly connected at the opening of the expansion chamber 13. The air entering the air duct 5 can be preferentially contacted with the heat conducting plate 43, so that the outside air and the heat conducting plate 43 exchange heat, thereby changing the air pressure in the expansion chamber 13 and changing the pressure condition of the pressure sensor 14, thereby controlling the operation of the linear actuator 11 to push the piston 42 to move in the pressure chamber 10, so that the expansion airbag 41 expands and accelerates the mixing efficiency of the air in the dust-free workshop and the air in the air duct 5.

[0051] When the outdoor air is higher than the air in the clean room, observe Figure 7 It can be found that the high-temperature air entering the air duct 5 will first contact the heat conducting plate 43 to expand the air in the expansion chamber 13, and then the pressure sensor 14 sends an electrical signal to make the linear actuator 11 operate to push the piston 42 to move left. At this time, the air on the left side of the piston 42 is pressed into the expansion airbag 41, causing the corresponding expansion airbag 41 to expand and deform, changing the air passing cross-section at this place, increasing the suction force at the through groove 9, and accelerating the intake of air in the dust-free workshop, thereby effectively improving the cooling effect of the outside air and reducing the energy consumption of the constant temperature component 3; and when the outside air is lower than the air in the dust-free workshop, it is observed that Figure 8 It can be found that when the air entering the airway 5 contacts the heat conducting plate 43, the air in the expansion chamber 13 cools down and contracts, causing the pressure of the pressure sensor 14 to decrease. Then the pressure sensor 14 sends an electrical signal to control the linear actuator 11 to push the piston 42 to move right. At this time, the piston 42 presses the air on the right side into the corresponding expansion airbag 41, so that the corresponding expansion airbag 41 expands and deforms to accelerate the mixing efficiency of the outside air and the air in the dust-free workshop, increase the temperature of the outside air, and reduce the energy consumption of the constant temperature component 3. Therefore, it can be found that in a low temperature environment or a high temperature environment, the ventilation device can effectively reduce the constant temperature cost.

[0052] In a further preferred embodiment of the present invention, Figure 4 As shown, the exhaust hole 12 is composed of a main hole 121 and a branch hole 122. The main hole 121 is opened on one side of the pressure chamber 10, and two groups of holes 122 are separated and opened on the side of the main hole away from the pressure chamber 10. The two groups of holes 122 are respectively connected to the two expansion airbags 41 on the same side.

[0053] In the present embodiment, since expansion airbags 41 are provided on both sides of the through groove 9, in order to make the expansion airbags 41 on both sides expand simultaneously, a main hole 121 for exhaust is opened on the side wall of the pressure chamber 10, and two groups of holes 122 are arranged at intervals on the main hole 121, and the two groups of holes 122 are respectively connected to the two expansion airbags 41 on the same side, so as to ensure that when the piston 42 moves, the two expansion airbags 41 on the same side can expand or contract synchronously, so as to ensure the stable pressure regulation at the opening of the through groove 9.

[0054] In a further preferred embodiment of the present invention, Figure 3 As shown, the linear drive 11 includes a motor 111 and a screw 112. The motor 111 is embedded in the inner wall of one side of the pressure chamber 10. The output shaft of the motor 111 is fixedly connected to the screw 112. The screw 112 passes through the piston 42 and is rotatably connected to the inner wall of the other side of the pressure chamber 10. Sealing rings 113 are fixedly connected on both sides of the piston 42 at the place where the screw 112 passes.

[0055] In this embodiment, a motor 111 is embedded on the side wall of the pressure chamber 10, and the output shaft of the motor 111 is fixedly connected to a screw rod 112, and the screw rod 112 passes through the piston 42 and is rotatably connected to the inner wall of the other side of the pressure chamber 10. When the piston 42 is located in the middle of the pressure chamber 10, the cavities on both sides of the piston 42 are the same, so that the air pressure on both sides of the piston 42 is the same, which is convenient for the expansion control of the inflatable airbag 41.

[0056] When the screw rod 112 and the piston 42 are threadedly connected, a gap is generated at the connection of the piston 42. When the piston 42 squeezes the air on one side to deform the expansion bag 41, the pressurized air will leak through the gap and affect the deformation of the expansion bag 41, thereby affecting the air intake in the dust-free workshop, resulting in an increase in the constant temperature cost of the ventilation device. Figure 3 It can be found that sealing rings 113 are fixedly connected to both sides of the piston 42 at the places where the screw rod 112 passes through, and the sealing rings 113 are lip sealing rings, labyrinth sealing rings and other sealing members used for dynamic sealing, which are commonly used for the screw rod 112. This can effectively ensure that there is no air leakage at the connection between the piston 42 and the screw rod 112, thereby ensuring the expansion degree of the inflation airbag 41, and further ensuring the energy-saving effect of the ventilation device.

[0057] In a further preferred embodiment of the present invention, Figure 2 and Figure 5 As shown, the thermostatic assembly 3 includes a compressor 31, a heat exchanger 32 and a four-way valve 33. The heat exchangers 32 are arranged on both sides of the housing 1. The heat exchanger 32 close to the fan 2 is installed at the bottom of the housing 1, and the heat exchanger 32 away from the fan 2 is fixedly connected to the air duct 5. Two sets of pipelines for heat exchange medium circulation are arranged between the two heat exchangers 32.

[0058] One set of pipelines is fixedly connected to a compressor 31, and the other set of pipelines is fixedly connected to a four-way valve 33 for changing the moving direction of the heat exchange medium;

[0059] A temperature sensor 15 is fixedly connected in the air duct 5, and the temperature sensor 15 is arranged on a side of the heat exchanger 32 close to the fan 2;

[0060] A spoiler 16 is fixedly connected between the heat exchanger 32 and the expansion airbag 41 in the air passage 5 , and the spoiler 16 is obliquely arranged in the air passage 5 .

[0061] In this embodiment, heat exchangers 32 are provided on both sides of the shell 1, the heat exchanger 32 close to the fan 2 is installed at the bottom of the shell 1, and the heat exchanger 32 away from the fan 2 is fixedly connected in the air duct 5. Two groups of pipelines for circulation of heat exchange medium are provided between the two heat exchangers 32. At the same time, a compressor 31 is fixedly connected to one of the pipelines, and the heat exchange of the two heat exchangers 32 can be controlled by the compressor 31. The four-way valve 33 installed on the other pipeline can be used to change the flow direction of the heat exchange medium, thereby changing the cooling and heating effects of the two heat exchangers 32. The constant temperature component 3 is used to cool or heat the air in the air duct 5 in extreme weather, which can be used to ensure the stability of the constant temperature.

[0062] A spoiler 16 is fixedly connected between the heat exchanger 32 and the expansion airbag 41 in the air duct 5, and the spoiler 16 is tilted so that the flowing air is blocked and disturbed by the spoiler 16, so that the air entering the air duct 5 at the through groove 9 and the outside air in the air duct 5 can be better mixed, thereby further ensuring the air reduction efficiency in the air duct 5. Subsequently, a temperature sensor 15 is provided on the side of the heat exchanger 32 close to the fan 2, which can be used to measure the temperature of the mixed and cooled air, so as to control the output power of the constant temperature component 3 and further ensure the accuracy of the constant air temperature.

[0063] In a further preferred embodiment of the present invention, Figure 2 and Figure 6 As shown, a limit plate 17 is fixedly connected to the inner wall of the air duct 5 close to the fan 2, a dust filter plate 18 is clamped on the side of the limit plate 17 away from the fan 2, and two handles 19 for disassembly are symmetrically connected to the outer edge of the side wall of the dust filter plate 18;

[0064] The outer peripheral wall of the dust filter plate 18 is provided with a circular groove 20, a clamping block 21 is slidably arranged in the circular groove 20, and a supporting spring 22 is fixedly arranged between the clamping block 21 and the circular groove 20;

[0065] The side wall of the limiting plate 17 is provided with a mounting groove 23 for mounting the dust filter plate 18 , and the inner wall of the mounting groove 23 is provided with a clamping groove 24 for clamping the clamping block 21 .

[0066] In this embodiment, since the outside air will inevitably contain dust, when the outside air enters the clean room, the dust content in the clean room will increase, affecting the operation of the machine. Figure 2 It can be found that a limit plate 17 is provided on the side of the air duct 5 close to the fan 2, and a mounting groove 23 is provided on the side of the limit plate 17 away from the fan 2. A dust filter plate 18 is installed in the mounting groove 23, which can be used to filter the air entering the air duct 5 to ensure the stability of machine operation in the dust-free workshop.

[0067] As the ventilation time increases, the dust filter plate 18 will gradually become clogged, which will affect the ventilation effect in the later stage. Therefore, a circular groove 20 is provided on the outer wall of the dust filter plate 18, and a block 21 is slidably provided in the circular groove 20. A supporting spring 22 is provided between the block 21 and the circular groove 20. At the same time, a slot 24 connected with the block 21 is provided in the mounting groove 23, which can be used to quickly replace the dust filter plate 18 and facilitate subsequent maintenance of the ventilation device.

[0068] By symmetrically connecting the handles 19 to the outer edges of the side walls of the dust filter plate 18 , the difficulty of disassembling the dust filter plate 18 can be further reduced, and the replacement efficiency of the dust filter plate 18 can be improved.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation device for a dust-free workshop, characterized in that: include: A housing (1), wherein an air passage (5) for ventilation is provided in the middle of the housing (1), and protective nets (6) are installed at both ends of the air passage (5); A fan (2) is arranged on one side of the air duct (5) and fixedly connected to the inner wall of the air duct (5); A thermostatic component (3) disposed in the housing (1) and used for adjusting ventilation temperature, the thermostatic component (3) comprising a compressor (31), a heat exchanger (32) and a four-way valve (33), the housing (1) being provided with a heat exchanger (32) on both sides, the heat exchanger (32) on the side close to the fan (2) being mounted on the bottom of the housing (1), and the heat exchanger (32) on the side away from the fan (2) being fixedly connected to the air duct (5); A heat exchange component (4), comprising an expansion airbag (41), an air intake chamber (7) being provided in the housing (1) and located outside the air duct (5), an air inlet (8) being provided on the outer wall of the housing (1) on a side away from the fan (2) and connected to the air intake chamber (7), two groups of through grooves (9) being provided at intervals on a side of the air intake chamber (7) away from the air inlet (8) and connected to the air duct (5), an expansion airbag (41) being fixedly connected to each of the two sides of each group of through grooves (9) on the inner wall of the air duct (5), and the air inlet (8) being used to draw air in the dust-free workshop into the air duct (5) for mixing with air from the outside; A piston (42), a pressure chamber (10) is provided in the housing (1) between the air passage (5) and the air suction chamber (7) and between the two groups of through grooves (9), the piston (42) is slidably disposed in the pressure chamber (10) and is connected to the pressure chamber (10) via a linear driver (11), exhaust holes (12) in communication with the expansion airbag (41) are provided on both sides of the pressure chamber (10), the exhaust holes (12) being composed of a main hole (121) and sub-holes (122), the main hole (121) being provided on one side of the pressure chamber (10), two groups of holes (122) being provided at intervals on a side of the main hole (121) away from the pressure chamber (10), the two groups of holes (122) being respectively in communication with the two expansion airbags (41) on the same side; The inner wall of the air duct (5) is located between the air suction cavity (7) and the fan (2) and is concave to form an expansion chamber (13). A pressure sensor (14) for controlling the linear actuator (11) is fixedly connected in the expansion chamber (13). The heat conducting plate (43) is fixedly connected at the opening of the expansion chamber (13). External air entering the air duct (5) contacts the heat conducting plate (43) first.

2. A ventilation device for a clean room according to claim 1, characterized in that: The linear drive (11) comprises a motor (111) and a screw (112); the motor (111) is embedded in one side inner wall of the pressure chamber (10); the output shaft of the motor (111) is fixedly connected to the screw (112); the screw (112) passes through the piston (42) and is rotatably connected to the other side inner wall of the pressure chamber (10); sealing rings (113) are fixedly connected to both sides of the piston (42) at the position where the screw (112) passes through.

3. A ventilation device for a clean room according to claim 1, characterized in that: A temperature sensor (15) is fixedly connected inside the air duct (5), and the temperature sensor (15) is arranged on a side of the heat exchanger (32) close to the fan (2).

4. A ventilation device for a clean room according to claim 3, characterized in that: A spoiler (16) is fixedly connected between the heat exchanger (32) and the expansion airbag (41) in the air passage (5), and the spoiler (16) is arranged obliquely in the air passage (5).

5. A ventilation device for a clean room according to claim 1, characterized in that: A limit plate (17) is fixedly connected to the inner wall of the air duct (5) on one side close to the fan (2), a dust filter plate (18) is clamped on the side of the limit plate (17) away from the fan (2), and two handles (19) for disassembly are symmetrically connected to the outer edge of the side wall of the dust filter plate (18).

6. A ventilation device for a clean room according to claim 5, characterized in that: The outer peripheral wall of the dust filter plate (18) is provided with a circular groove (20), a clamping block (21) is slidably arranged in the circular groove (20), and a supporting spring (22) is fixedly arranged between the clamping block (21) and the circular groove (20); A mounting groove (23) for mounting the dust filter plate (18) is formed on the side wall of the limiting plate (17), and a clamping groove (24) for clamping the clamping block (21) is formed on the inner wall of the mounting groove (23).

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