Fresh air device and cold chain unit

Abstract

The invention provides a fresh air device and a cold chain unit. The fresh air device is applied to the cold chain unit and comprises an air inlet pipeline used for introducing fresh air, an air outlet pipeline used for discharging return air and an air door assembly, the air door assembly comprises a first air door and a second air door which are in linkage, the first air door is arranged in a pipeline of the air inlet pipeline, and the second air door is arranged in a pipeline of the air outlet pipeline. The air door assembly has an open state and a closed state. When the air door assembly is in a closed state, the first air door blocks the pipeline of the air inlet pipeline. The pipeline of the air outlet pipeline is blocked by the second air door; when the air door assembly is in the open state, the first air door opens a pipeline of the air inlet pipeline so that outside fresh air can enter a closed cavity where an evaporator of the cold chain unit is located from the air inlet pipeline. And the second air door opens a pipeline of the air outlet pipeline, so that return air can be discharged to the outside from the air outlet pipeline. The air exchange problem in the cold chain transportation process can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a fresh air device and a cold chain unit. Background Art

[0002] Cold chain transportation often involves shipping containers. These containers are typically sealed for temperature control. Heat or harmful gases generated by some transported fruits and vegetables cannot escape, easily leading to spoilage. Therefore, addressing ventilation issues during cold chain transportation presents a significant challenge. Summary of the Invention

[0003] The purpose of this application is to provide a fresh air device and a cold chain unit that can effectively solve the problem of air exchange during cold chain transportation.

[0004] One aspect of the present application provides a fresh air device, which is applied to a cold chain unit. The fresh air device includes an air inlet duct for introducing fresh air, an air outlet duct for removing return air, and a damper assembly. The damper assembly includes a first damper and a second damper that are linked together. The first damper is arranged in the pipe of the air inlet duct, and the second damper is arranged in the pipe of the air outlet duct. The damper assembly has an open state and a closed state. When the damper assembly is in the closed state, the first damper blocks the pipe of the air inlet duct; the second damper blocks the pipe of the air outlet duct; when the damper assembly is in the open state, the first damper opens the pipe of the air inlet duct so that the fresh air outside can enter the closed chamber where the evaporator of the cold chain unit is located from the air inlet duct; the second damper opens the pipe of the air outlet duct so that the return air can be discharged from the air outlet duct to the outside.

[0005] Furthermore, the damper assembly also includes a rotating shaft, which passes through the air inlet duct and the air outlet duct. The first damper and the second damper are both fixed on the rotating shaft. When the rotating shaft rotates, the rotating shaft drives the first damper and the second damper to flip together.

[0006] Furthermore, the damper assembly also includes a drive assembly and a connecting rod assembly, one end of the connecting rod assembly is connected to the drive assembly, and the other end of the connecting rod assembly is connected to the rotating shaft, and the drive assembly is used to drive the connecting rod assembly to move to drive the rotating shaft to rotate.

[0007] Furthermore, the driving assembly includes an electromagnet assembly, wherein when the electromagnet assembly is energized, the electromagnet assembly drives the connecting rod assembly to move, and the damper assembly is in the open state; when the electromagnet assembly is de-energized, the connecting rod assembly returns to its initial position, and the damper assembly is in the closed state.

[0008] Furthermore, the damper assembly also includes an elastic member, one end of which is mounted on the connecting rod assembly and the other end of which is fixed, wherein when the electromagnet assembly is powered off, the connecting rod assembly returns to the initial position under the action of the elastic restoring force of the elastic member.

[0009] Furthermore, the electromagnet assembly includes a coil and an iron core located in the coil, and the connecting rod assembly includes an active rod, a first driven rod and a second driven rod, wherein one end of the active rod is fixedly connected to the iron core, and the other end of the active rod is movably connected to one end of the first driven rod; the other end of the first driven rod is movably connected to the second driven rod, the second driven rod is fixed on the rotating shaft, and the elastic member is connected to the second driven rod.

[0010] Furthermore, the fresh air device also includes a magnetic switch, which includes a stationary block and a moving block, wherein the moving block is arranged on the second driven rod of the connecting rod assembly, and the magnetic switch is used to detect the distance change between the moving block and the stationary block to provide a feedback signal.

[0011] Furthermore, the fresh air device also includes a support plate, the air inlet duct, the air outlet duct and the damper assembly are fixed to the support plate, and the fresh air device is used to be fixed to the cold chain unit through the support plate.

[0012] Furthermore, the fresh air device also includes two guide members, the two guide members are fixed on the support plate, and the two ends of the rotating shaft are respectively positioned in the two guide members.

[0013] Furthermore, a first fixing hole and a second fixing hole are provided on the rotating shaft, a first fixing piece is provided on the first damper, and a second fixing piece is provided on the second damper. The first fixing piece is fixed in the first fixing hole to fix the first damper on the rotating shaft; the second fixing piece is fixed in the second fixing hole to fix the second damper on the rotating shaft.

[0014] Furthermore, the damper assembly also includes a first sealing ring and a second sealing ring, the first sealing ring is installed around the first damper, and is used to provide sealing when the first damper blocks the pipe of the air inlet duct; the second sealing ring is installed around the second damper, and is used to provide sealing when the second damper blocks the pipe of the air outlet duct.

[0015] Furthermore, the air inlet duct includes a first metal duct, the air outlet duct includes a second metal duct, the first damper and the second damper are respectively arranged in the first metal duct and the second metal duct, the first metal duct is provided with a first slot, the second metal duct is provided with a second slot, the slot openings of the first slot and the second slot are oriented in the same direction, and the rotating shaft is installed from the first slot and the second slot to the first metal duct and the second metal duct.

[0016] Furthermore, the air inlet pipeline further includes a first hose, and the air outlet pipeline further includes a second hose. The first hose is installed on one end of the first metal pipeline, and the second hose is installed on one end of the second metal pipeline.

[0017] Another aspect of the present application provides a cold chain unit for providing a low-temperature environment for a container. The cold chain unit includes an evaporator, a condenser, a compressor, and the fresh air device described above. The air inlet pipeline of the fresh air device has an air inlet, which is connected to the closed cavity where the evaporator is located. The air outlet pipeline of the fresh air device has a return air outlet, which is connected to the interior of the container.

[0018] Furthermore, the cold chain unit also includes a mounting frame, and the fresh air device is installed on the mounting frame.

[0019] The fresh air device and cold chain unit of one or more embodiments of the present application are equipped with a damper assembly, and the damper assembly can be switched between an open state and a closed state. When the damper assembly is in an open state, the ventilation of the air inlet duct and the exhaust of the air outlet duct can be opened; when the damper assembly is in a closed state, the ventilation of the air inlet duct and the exhaust of the air outlet duct can be closed, thereby realizing the ventilation and closing of the fresh air duct.

[0020] The fresh air device and cold chain unit of one or more embodiments of the present application can decide whether to open the damper assembly of the fresh air device according to actual needs or the actual cargo loaded in the container, effectively solving the problem of air exchange during cold chain transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional schematic diagram of a fresh air device according to an embodiment of the present application.

[0022] Figure 2 This is another three-dimensional schematic diagram of a fresh air device according to an embodiment of the present application.

[0023] Figure 3 This is a three-dimensional schematic diagram of a fresh air device in a closed state according to an embodiment of the present application.

[0024] Figure 4 This is a three-dimensional schematic diagram of a fresh air device in an open state according to an embodiment of the present application.

[0025] Figure 5 This is a partially exploded schematic diagram of a damper assembly according to one embodiment of the present application.

[0026] Figure 6 This is a partial three-dimensional schematic diagram of a damper assembly according to one embodiment of the present application.

[0027] Figure 7 This is a schematic cross-sectional view of a fresh air device according to an embodiment of the present application.

[0028] Figure 8 This is a schematic top view of a fresh air device according to an embodiment of the present application.

[0029] Figure 9 This is a three-dimensional schematic diagram of a cold chain unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0031] The following will describe in detail the fresh air device and cold chain unit of the present application with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0032] The present application provides a fresh air device. The fresh air device of the present application can be applied to a cold chain unit, for example. Figure 1 A three-dimensional schematic diagram of a fresh air device 100 according to an embodiment of the present application is disclosed. Figure 2 Another perspective schematic diagram of a fresh air device 100 according to an embodiment of the present application is disclosed. Figure 1 and Figure 2 As shown, a fresh air device 100 according to an embodiment of the present application includes an air inlet duct 110 for introducing fresh air, an air outlet duct 120 for removing return air, and a damper assembly.

[0033] The damper assembly includes a first damper 131 and a second damper 132 that are linked together. Figure 3 and Figure 4 As shown, the first damper 131 is disposed in the air inlet duct 110 , and the second damper 132 is disposed in the air outlet duct 120 .

[0034] The damper assembly has an open state and a closed state. Figure 3 A three-dimensional schematic diagram of a fresh air device 100 in a closed state according to an embodiment of the present application is disclosed. Figure 4 The figure shows a three-dimensional diagram of a fresh air device 100 in an open state according to an embodiment of the present application. Figure 3 and Figure 4 In order to show the damper structure inside the pipeline, a part of the pipeline is cut away to expose the internal channel of the pipeline. Figure 3 As shown, when the damper assembly is in the closed state, the first damper 131 blocks the air inlet duct 110; the second damper 132 blocks the air outlet duct 120. Figure 4 As shown, when the damper assembly is in the open state, the first damper 131 opens the pipe of the air inlet duct 110 so that fresh air from outside can enter the closed chamber where the evaporator of the cold chain unit 200 is located from the air inlet duct 110; the second damper 132 opens the pipe of the air outlet duct 120 so that return air can be discharged from the air outlet duct 120 to the outside.

[0035] The fresh air device 100 of the present application is provided with a damper assembly, and the damper assembly can be switched between an open state and a closed state. When the damper assembly is in an open state, the ventilation of the air inlet duct 110 and the exhaust of the air outlet duct 120 can be opened; when the damper assembly is in a closed state, the ventilation of the air inlet duct 110 and the exhaust of the air outlet duct 120 can be closed, thereby realizing the ventilation and closing of the fresh air duct.

[0036] In some embodiments, the fresh air device 100 of the present application may further include a support plate 101 , wherein the air inlet duct 110 , the air outlet duct 120 and the damper assembly are fixed on the support plate 101 , and the fresh air device 100 may be fixed to the cold chain unit 200 through the support plate 101 .

[0037] In some embodiments, the damper assembly further includes a rotating shaft 140, which is disposed through the air inlet duct 110 and the air outlet duct 120. The first damper 131 and the second damper 132 are both fixed to the rotating shaft 140 at the same angle. When the rotating shaft 140 rotates, the rotating shaft 140 can cause the first damper 131 and the second damper 132 to flip together, thereby enabling the damper assembly to switch between an open state and a closed state.

[0038] Figure 5 A partially exploded perspective view of a damper assembly according to an embodiment of the present application is disclosed. Figure 6 A partial perspective diagram of a damper assembly according to an embodiment of the present application is disclosed. Figure 5 and Figure 6 As shown, optionally, a first fixing hole 141 and a second fixing hole 142 are provided on the rotating shaft 140. Correspondingly, a first mounting hole 1310 is provided on the first damper 131, and a second mounting hole 1320 is provided on the second damper 132. The damper assembly further includes a first fixing member 135 and a second fixing member 136. The first fixing member 135 is fixed to the first mounting hole 1310 on the first damper 131 and the first fixing hole 141 of the rotating shaft 140, thereby fixing the first damper 131 to the rotating shaft 140; the second fixing member 136 is fixed to the second mounting hole 1320 on the second damper 132 and the second fixing hole 142 of the rotating shaft 140, thereby fixing the second damper 132 to the rotating shaft 140.

[0039] In some embodiments, the damper assembly may further include a first sealing ring 133 and a second sealing ring 134. The first sealing ring 133 is installed around the first damper 131, and the first sealing ring 133 can provide a seal when the first damper 131 blocks the pipe of the air inlet duct 110. The second sealing ring 134 is installed around the second damper 132, and the second sealing ring 134 provides a seal when the second damper 132 blocks the pipe of the air outlet duct 120. In one embodiment, the first damper 131 and the first sealing ring 133 are an integrated structure, and the second damper 132 and the second sealing ring 134 are an integrated structure. For example, the first damper 131 and the second damper 132 are metal plates, such as aluminum plates or stainless steel plates, and the first sealing ring 133 and the second sealing ring 134 are black rubber. During the rubber vulcanization process, the metal plates can be placed together in the mold, so that the rubber and the metal plates can become an integrated structure after the rubber is vulcanized.

[0040] like Figure 5 and Figure 6 And with reference Figure 2 As shown, in some embodiments, the fresh air device 100 of the present application may further include two guide members 102, each guide member 102 having a positioning hole 1020. The two ends of the rotating shaft 140 are respectively positioned in the positioning holes 1020 of the two guide members 102. The two guide members 102 can be fixed to the support plate 101 by fasteners. The guide members 102 can guide the rotating shaft 140, ensuring that the rotating shaft 140 can smoothly and simultaneously drive the first damper 131 and the second damper 132 to flip in the duct during rotation without being stuck by the duct wall.

[0041] Figure 7A cross-sectional schematic diagram of a fresh air device 100 according to an embodiment of the present application is disclosed. Figure 8 The top view of the fresh air device 100 according to one embodiment of the present application is disclosed. Figure 7 and Figure 8 As shown, in some embodiments, the damper assembly further includes a drive assembly and a connecting rod assembly 160. One end of the connecting rod assembly 160 is connected to the drive assembly, and the other end of the connecting rod assembly 160 is connected to the rotating shaft 140. The drive assembly can drive the connecting rod assembly 160 to rotate, thereby driving the rotating shaft 140 to rotate. The rotating shaft 140 can then drive the first damper 131 and the second damper 132 to flip in the pipe of the air inlet duct 110 and the pipe of the air outlet duct 120, respectively, thereby switching the state of the damper assembly.

[0042] In one embodiment, the drive assembly may include an electromagnet assembly 150. When the electromagnet assembly 150 is energized, the electromagnet assembly 150 drives the connecting rod assembly 160 to move, which in turn drives the rotating shaft 140 to rotate. The rotating shaft 140 then drives the first damper 131 and the second damper 132 to flip, placing the damper assembly in an open state. When the electromagnet assembly 150 is de-energized, the connecting rod assembly 160 returns to its initial position, placing the damper assembly in a closed state.

[0043] In some embodiments, the damper assembly further includes an elastic member 170, which may be, for example, a spring. One end of the elastic member 170 is mounted on the connecting rod assembly 160, and the other end of the elastic member 170 is fixed to the support plate 101. When the electromagnet assembly 150 is de-energized, the connecting rod assembly 160 automatically returns to its initial position due to the elastic restoring force of the elastic member 170.

[0044] Electromagnet assembly 150 includes a coil 151 and an iron core 152 located within coil 151. Iron core 152 is connected to connecting rod assembly 160. When power is applied to coil 151 within electromagnet assembly 150, the current generates a magnetic field around coil 151. The direction of the magnetic field is determined by Ampere's law (the right-hand screw rule). This magnetic field causes iron core 152 to move, driving connecting rod assembly 160 in motion. When power is removed from coil 151 within electromagnet assembly 150, the magnetic field disappears.

[0045] like Figure 7 and Figure 8As shown, in some embodiments, the connecting rod assembly 160 includes an active rod 161, a first driven rod 162, and a second driven rod 163. One end of the active rod 161 is fixedly connected to the iron core 152, for example, the active rod 161 and the iron core 152 are fixedly connected by threads; the other end of the active rod 161 is movably connected to one end of the first driven rod 162. The other end of the first driven rod 162 is movably connected to the second driven rod 163, and the second driven rod 163 is fixed to the rotating shaft 140. One end of the elastic member 170 is connected to the second driven rod 163. Optionally, the second driven rod 163 is sleeved and fixed on the rotating shaft 140, and a hook portion 1631 is provided at the bottom of the second driven rod 163, and one end of the elastic member 170 is hooked on the hook portion 1631 at the bottom of the second driven rod 163.

[0046] When the coil 151 in the electromagnet assembly 150 is energized, the iron core 152 in the electromagnet assembly 150 drives the active rod 161 to move together, and the active rod 161 then drives the first driven rod 162 and the second driven rod 163 to move. Since the second driven rod 163 is fixed on the rotating shaft 140, the second driven rod 163 further drives the rotating shaft 140 to rotate.

[0047] like Figure 3 and Figure 4 As shown, in some embodiments, the fresh air device 100 of the present application may further include a magnetic switch 180. The magnetic switch 180 is a device that uses changes in a magnetic field to control the on / off state of a circuit. The magnetic switch 180 includes a moving block 181 and a stationary block 182. The moving block 181 is mounted on the second driven rod 163 of the connecting rod assembly 160, and the stationary block 182 is fixed to the support plate 101. The magnetic switch 180 can be used to detect changes in the distance between the moving block 181 and the stationary block 182 to provide a feedback signal. For example, when the moving block 181 and the stationary block 182 maintain an initial distance, a magnetic field exists between the two blocks, and the magnetic switch 180 is in a first switching state. When the distance between the moving block 181 and the stationary block 182 increases, the magnetic field between the two blocks disappears, and the magnetic switch 180 is in a second switching state. Therefore, changes in the distance between the moving block 181 and the stationary block 182 cause a change in the state of the magnetic switch 180. The motion block 181 can be connected to the main control cabinet via a wire, and can provide the main control cabinet with a feedback signal of the state of the magnetic switch 180. The main control cabinet can determine whether the operation of the damper assembly is normal based on the feedback signal.

[0048] For example, when the electromagnet assembly 150 is energized, the iron core 152 drives the connecting rod assembly 160 to move. The moving block 181 is fixed to the second driven rod 163 of the connecting rod assembly 160. Therefore, under normal circumstances, the movement of the connecting rod assembly 160 will drive the moving block 181 to move together, thereby increasing the distance between the moving block 181 and the stationary block 182. However, if the feedback signal provided by the moving block 181 determines that the distance between the moving block 181 and the stationary block 182 has not increased, it indicates that the electromagnet assembly 150 may have a fault. Therefore, the operation of the damper assembly can be monitored through the magnetic switch 180.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the air inlet duct 110 includes a first metal duct 111, the air outlet duct 120 includes a second metal duct 121, and a first damper 131 and a second damper 132 are respectively disposed in the first metal duct 111 and the second metal duct 121. Optionally, the first metal duct 111 is provided with a first slot 1110, and the second metal duct 121 is provided with a second slot 1210. The first slot 1110 and the second slot 1210 have the same orientation. Therefore, the rotating shaft 140 can be installed into the first metal duct 111 and the second metal duct 121 through the first slot 1110 and the second slot 1210. Thus, the rotating shaft 140 can be conveniently installed into the first metal duct 111 and the second metal duct 121 through the first slot 1110 and the second slot 1210.

[0050] In some embodiments, the air inlet pipe 110 may further include a first hose 112, which is mounted on one end of the first metal pipe 111; the air outlet pipe 120 may further include a second hose 122, which is mounted on one end of the second metal pipe 121. The first hose 112 and the second hose 122 allow the pipes of the fresh air device 100 of the present application to be flexibly and conveniently connected to corresponding devices.

[0051] The present application also provides a cold chain unit 200. The cold chain unit 200 can be used to provide a low-temperature environment for a container. Figure 9 The figure shows a three-dimensional schematic diagram of a cold chain unit 200 according to an embodiment of the present application. Figure 9 As shown, a cold chain unit 200 according to one embodiment of the present application includes a refrigeration circuit, which includes an evaporator, a condenser, and a compressor. The cold chain unit 200 according to the present application also includes the fresh air device 100 described above. The air inlet pipe 110 in the fresh air device 100 has an air inlet 1120, and the air outlet pipe 120 in the fresh air device 100 has a return air port 1220. The air inlet 1120 is connected to the sealed cavity 202 where the evaporator is located, and the return air port 1220 is connected to the interior of the container.

[0052] In some embodiments, the cold chain unit 200 of the present application further includes a mounting frame 201, and the fresh air device 100 is mounted on the mounting frame 201. The mounting frame 201 can be, for example, a metal frame. The back of the mounting frame 201 is mounted on the container.

[0053] Specifically, a first through-hole and a second through-hole are formed in the mounting frame 201. The first metal conduit 111 in the air inlet duct 110 of the fresh air device 100 and the second metal conduit 121 in the air outlet duct 120 pass through the first through-hole and the second through-hole, respectively. Furthermore, the fresh air device 100 is fixed to the mounting frame 201 of the cold chain unit 200 via the support plate 101. One end of the first hose 112 in the air inlet duct 110 is mounted on the end of the first metal conduit 111, and the other end of the first hose 112 extends into the sealed cavity 202 where the evaporator is located. One end of the second hose 122 in the air outlet duct 120 is mounted on the end of the second metal conduit 121, and the other end of the second hose 122 extends into the interior of the container.

[0054] When the damper assembly of the fresh air device 100 is open, the negative pressure created by the operation of the evaporator fan draws fresh air from outside through the air inlet duct 110 and blows it into the container. Subsequently, the increased pressure inside the container forces the air out of the container through the air outlet duct 120, thus forming an air exchange cycle. Therefore, the damper assembly of the fresh air device 100 can be opened or closed based on actual needs or the actual cargo loaded in the container, effectively solving the air exchange problem during cold chain transportation.

[0055] The above is a detailed introduction to the fresh air device and cold chain unit provided in the embodiments of the present application. Specific examples are used herein to illustrate the fresh air device and cold chain unit of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A fresh air device, applied to a cold chain unit, characterized in that: It includes an air inlet duct for introducing fresh air, an air outlet duct for removing return air, and a damper assembly, wherein the damper assembly includes a first damper and a second damper that are linked together, wherein the first damper is arranged in the pipe of the air inlet duct, and the second damper is arranged in the pipe of the air outlet duct, and the damper assembly has an open state and a closed state, wherein, When the damper assembly is in the closed state, the first damper blocks the air inlet duct; the second damper blocks the air outlet duct; When the damper assembly is in the open state, the first damper opens the pipe of the air inlet duct so that fresh air from outside can enter the closed chamber where the evaporator of the cold chain unit is located from the air inlet duct; the second damper opens the pipe of the air outlet duct so that return air can be discharged from the air outlet duct to the outside.

2. The fresh air device according to claim 1, characterized in that: The damper assembly also includes a rotating shaft, which passes through the air inlet duct and the air outlet duct. The first damper and the second damper are both fixed on the rotating shaft. When the rotating shaft rotates, the rotating shaft drives the first damper and the second damper to flip together.

3. The fresh air device according to claim 2, characterized in that: The damper assembly also includes a drive assembly and a connecting rod assembly, one end of the connecting rod assembly is connected to the drive assembly, and the other end of the connecting rod assembly is connected to the rotating shaft. The drive assembly is used to drive the connecting rod assembly to move to drive the rotating shaft to rotate.

4. The fresh air device according to claim 3, characterized in that: The driving assembly includes an electromagnet assembly, wherein: When the electromagnet assembly is energized, the electromagnet assembly drives the connecting rod assembly to move, and the damper assembly is in the open state; When the electromagnet assembly is powered off, the connecting rod assembly returns to its initial position and the damper assembly is in the closed state.

5. The fresh air device according to claim 4, characterized in that: The damper assembly further includes an elastic member, one end of which is mounted on the connecting rod assembly, and the other end of which is fixed, wherein: When the electromagnet assembly is powered off, the connecting rod assembly returns to the initial position under the action of the elastic restoring force of the elastic member.

6. The fresh air device according to claim 5, characterized in that: The electromagnet assembly includes a coil and an iron core located in the coil, and the connecting rod assembly includes an active rod, a first driven rod and a second driven rod, wherein: One end of the active rod is fixedly connected to the iron core, and the other end of the active rod is movably connected to one end of the first driven rod; The other end of the first driven rod is movably connected to the second driven rod. The second driven rod is fixed on the rotating shaft. The elastic member is connected to the second driven rod.

7. The fresh air device according to claim 6, characterized in that: It also includes a magnetic switch, which includes a stationary block and a moving block, wherein the moving block is set on the second driven rod of the connecting rod assembly, and the magnetic switch is used to detect the change in the distance between the moving block and the stationary block to provide a feedback signal.

8. The fresh air device according to claim 2, characterized in that: It also includes a support plate, the air inlet duct, the air outlet duct and the damper assembly are fixed to the support plate, and the fresh air device is used to be fixed to the cold chain unit through the support plate.

9. The fresh air device according to claim 8, characterized in that: It also includes two guide members, which are fixed on the support plate, and the two ends of the rotating shaft are correspondingly positioned in the two guide members.

10. The fresh air device according to claim 2, characterized in that: A first fixing hole and a second fixing hole are provided on the rotating shaft, a first fixing piece is provided on the first damper, and a second fixing piece is provided on the second damper. The first fixing piece is fixed in the first fixing hole to fix the first damper on the rotating shaft; the second fixing piece is fixed in the second fixing hole to fix the second damper on the rotating shaft.

11. The fresh air device according to claim 10, characterized in that: The damper assembly also includes a first sealing ring and a second sealing ring. The first sealing ring is installed around the first damper to provide sealing when the first damper blocks the pipe of the air inlet duct; the second sealing ring is installed around the second damper to provide sealing when the second damper blocks the pipe of the air outlet duct.

12. The fresh air device according to claim 2, characterized in that: The air inlet duct includes a first metal duct, the air outlet duct includes a second metal duct, the first damper and the second damper are respectively arranged in the first metal duct and the second metal duct, the first metal duct is provided with a first slot, the second metal duct is provided with a second slot, the slot openings of the first slot and the second slot are oriented in the same direction, and the rotating shaft is installed from the first slot and the second slot into the first metal duct and the second metal duct.

13. The fresh air device according to claim 12, characterized in that: The air inlet pipeline further includes a first hose, and the air outlet pipeline further includes a second hose. The first hose is installed on one end of the first metal pipeline, and the second hose is installed on one end of the second metal pipeline.

14. A cold chain unit for providing a low temperature environment for a container, characterized in that: It includes an evaporator, a condenser, a compressor and a fresh air device as described in any one of claims 1 to 13, the air inlet pipe in the fresh air device has an air inlet, the air inlet is connected to the closed cavity where the evaporator is located, and the air outlet pipe in the fresh air device has a return air outlet, which is connected to the interior of the container.

15. The cold chain unit according to claim 14, characterized in that: It also includes a mounting frame, and the fresh air device is installed on the mounting frame.

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