A Freon medium evaporator

Abstract

The present invention discloses a Freon medium evaporator, which relates to the technical field of refrigeration equipment. It includes an evaporator housing. On the left side inside the evaporator housing, there is a heat exchange mechanism. On the right side inside the evaporator housing, there is a gas supply driving mechanism. Outside the heat exchange mechanism and the gas supply driving mechanism, there is a closed defrosting mechanism. On the closed defrosting mechanism, there is a trigger type air intake mechanism drivingly arranged. On the closed defrosting mechanism, there is a trigger type exhaust and drainage mechanism; the heat exchange mechanism includes a coil pipe, heat exchange fins, a heat conduction sliding sleeve and a traction rope; the coil pipe is fixedly arranged inside the evaporator housing. By setting a defrosting chamber to accommodate and defrost a plurality of heat exchange fins, the present invention can not only shorten the time required for preheating, but also enhance the defrosting effect, thereby effectively improving the defrosting efficiency. In addition, it can more conveniently output the water after the frost layer melts and avoid residue under the push of air flow.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and particularly relates to a Freon medium evaporator. Background Art

[0002] Most of the existing evaporators using Freon as the heat exchange medium are finned evaporators. As the use time prolongs, the frost layer on the fin surface will continuously thicken, thereby hindering the heat exchange between air and fins, reducing the heat exchange efficiency. In view of the above situation, those skilled in the art usually adopt the method of periodically heating the fins to remove the frost layer on the fin surface. Among them, hot gas bypass defrosting means using external hot air to heat the fins, thereby melting the frost layer into water.

[0003] However, the existing evaporators using hot gas bypass for defrosting still have some disadvantages in actual use. The more obvious one is that after the heated air enters the evaporator interior and briefly contacts the frost layer, it will fill the entire interior cavity of the evaporator. Due to the short contact time with the frost layer and the large interior cavity of the evaporator, it takes a long time to complete the temperature rise of the evaporator interior. Therefore, the defrosting efficiency is not ideal.

[0004] In addition, the water generated during the defrosting process will directly flow into the interior cavity of the evaporator and accumulate in the interior cavity of the evaporator. It is not easy to discharge later and is also prone to residue.

[0005] Therefore, it is necessary to invent a Freon medium evaporator to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a Freon medium evaporator to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A Freon medium evaporator, including an evaporator housing, a heat exchange mechanism is arranged on the left side inside the evaporator housing, a gas supply driving mechanism is arranged on the right side inside the evaporator housing, a closed defrosting mechanism is jointly arranged outside the heat exchange mechanism and the gas supply driving mechanism, a trigger type air intake mechanism is drivingly arranged on the closed defrosting mechanism, and a trigger type exhaust and drainage mechanism is arranged on the closed defrosting mechanism;

[0008] The heat exchange mechanism includes a coil pipe, heat exchange fins, a heat conduction sliding sleeve and a traction rope;

[0009] The coil is fixedly arranged on the inner side of the evaporator shell, and the output end and the input end of the coil both penetrate the inner wall of the evaporator shell and extend to the outer side of the evaporator shell. A plurality of heat exchange fins are provided, and the plurality of heat exchange fins are sleeved and arranged on the outer side of the coil. A plurality of heat conduction sleeves are provided, and the plurality of heat conduction sleeves are uniformly slidably sleeved and arranged on the outer side of the coil, and are respectively fixedly connected with the plurality of heat exchange fins. A plurality of traction ropes are provided, and the plurality of traction ropes are respectively arranged on the sides of the plurality of heat exchange fins.

[0010] The air supply drive mechanism includes a bidirectional screw, a hot air input pipe, a drive motor and a drive gear;

[0011] The bidirectional screw rod penetrates the outer wall of the evaporator shell and extends to the inside of the evaporator shell, and is rotatably connected to the evaporator shell through a bearing. The hot air input pipe is rotatably connected to the bidirectional screw rod through a rotary joint. The drive motor is fixedly arranged on the outside of the evaporator shell. Two drive gears are arranged, and the two drive gears are meshed with each other. One drive gear is transmission-connected to the drive motor, and the other drive gear is fixedly sleeved on the outside of the bidirectional screw rod.

[0012] Preferably, the closed defrosting mechanism comprises a closing plate, a closing shell, a dispersion chamber, a trigger sleeve, a transfer chamber and a dispersion hole.

[0013] Preferably, the closing plate is slidingly sleeved on the outside of the coil and is threadedly connected to the outside of the bidirectional screw rod. The closing plate is fixedly connected to the leftmost heat exchange fin through a traction rope. The closed shell is fixedly connected to the rightmost heat exchange fin through a traction rope. The closed shell is sleeved on the outside of the bidirectional screw rod and is threadedly connected to the bidirectional screw rod. The dispersion chamber is opened inside the closed shell. The trigger sleeve is sleeved on the outside of the bidirectional screw rod and fixedly arranged on the inner wall of the closed shell. The transfer chamber is opened on the inner side of the trigger sleeve. A plurality of dispersion holes are provided. The plurality of dispersion holes are evenly arranged on the inner wall of the closed shell. The transfer chamber and the plurality of dispersion holes are connected to the dispersion chamber.

[0014] Preferably, the trigger-type air intake mechanism includes a first air intake hole, a second air intake hole, a first sealing ring, a second sealing ring, a fixing collar, a first spring and a transmission rod.

[0015] Preferably, a plurality of the second air inlets and the second sealing rings are provided. The first air inlet and the plurality of second air inlets are sequentially formed in the front of the bidirectional lead screw from right to left. The first sealing ring is sleeved on the outside of the bidirectional lead screw and closes the first air inlet. The plurality of second sealing rings are evenly sleeved on the outside of the bidirectional lead screw and respectively close the plurality of second air inlets. The fixed collar is fixedly sleeved on the outside of the bidirectional lead screw. The first spring is sleeved on the outside of the bidirectional lead screw. One end of the first spring is fixedly connected to the first sealing ring and the other end is fixedly connected to the fixed collar. Two transmission rods are provided. The two transmission rods are respectively fixedly arranged at the top and bottom on the left side of the first sealing ring. The transmission rods penetrate through the plurality of second sealing rings and are fixedly connected to the plurality of second sealing rings.

[0016] Preferably, the trigger-type exhaust and drainage mechanism includes a discharge groove, a plugging slider, a guide rod, a second spring and a telescopic tube.

[0017] Preferably, the discharge groove is formed inside the closed housing. The plugging slider is slidably arranged inside the discharge groove. The guide rod slidably penetrates through the bottom left side of the closed housing and is fixedly connected to the plugging slider. The second spring is sleeved on the outside of the guide rod. One end of the second spring is fixedly connected to the inner wall of the discharge groove and the other end is fixedly connected to the plugging slider. The telescopic tube is fixedly penetrated through the bottom right side of the closed housing. One end of the telescopic tube is communicated with the discharge groove and the other end extends to the outside of the evaporator housing.

[0018] The present invention also provides a defrosting method for a Freon medium evaporator, which specifically includes the following steps:

[0019] S1. Start the driving motor. After the driving motor is started, the bidirectional lead screw is driven to rotate by two driving gears. When the bidirectional lead screw rotates, the closing plate and the closed housing move synchronously. At this time, the closing plate moves to the right and the closed housing moves to the left.

[0020] S2. When the rightward movement distance of the closing plate reaches the first threshold value, the closing plate contacts the leftmost heat-conducting sliding sleeve and pushes the frosting heat exchange fins through the heat-conducting sliding sleeve, so that the plurality of heat exchange fins slide along the coil tube to the right. At this time, the plurality of heat exchange fins approach each other and are evenly arranged.

[0021] S3. When the rightward movement distance of the closing plate reaches the second threshold value, the closed housing drives the trigger sleeve to push the first sealing ring. After the first sealing ring is pushed, it compresses the first spring. At the same time, it drives multiple second sealing rings to move leftward through the transmission rod. When the rightward movement distance of the closing plate reaches the third threshold value, the first sealing ring releases the blockage of the first air inlet hole, and multiple second sealing rings release the blockage of multiple second air inlet holes. The hot air output by the hot air input pipe enters the inside of the bidirectional lead screw and is output through the first air inlet hole and multiple second air inlet holes. At this time, the first air inlet hole is located inside the trigger sleeve. Therefore, the hot air output from the first air inlet hole enters the inside of the dispersion chamber through the transfer chamber and is then output through multiple dispersion holes;

[0022] S4. When the rightward movement distance of the closing plate reaches the fourth threshold value, the closing plate starts to push the guide rod. After the guide rod is pushed, it drives the plugging slider to move rightward. At this time, the second spring is stretched. When the rightward movement distance of the closing plate reaches the fifth threshold value, the closing plate contacts the closed housing, and the closing plate closes the opening of the closed housing. At this time, the plugging slider releases the blockage of the drain groove inlet, and then the drive motor is shut down;

[0023] S5. At this time, multiple heat exchange fins are all located in the defrosting chamber formed by the closing plate and the closed housing. The hot air flow output from multiple dispersion holes flushes the frost layer outside the heat exchange fins from the outside, and the hot air flow output from multiple second air inlet holes flushes the frost layer outside the heat exchange fins from the inside. The water after the frost layer melts enters the inside of the drain groove through the drain groove opening and is then output through the telescopic pipe under the drive of the air flow;

[0024] S6. After defrosting is completed, the drive motor is driven to rotate the bidirectional lead screw in the reverse direction, so that the closing plate resets to the left, and the closed housing resets to the right. During the reset process of the closing plate and the closed housing, the heat exchange fins are pulled through the traction rope, so that multiple heat exchange fins are reset synchronously.

[0025] The technical effects and advantages of the present invention:

[0026] The present invention is provided with a heat exchange mechanism, an air supply drive mechanism, a closed defrost mechanism, a trigger-type air intake mechanism and a trigger-type exhaust and drainage mechanism, so that the closed defrost mechanism can be driven by the air supply drive mechanism, so that the closed defrost mechanism can push a plurality of heat exchange fins in the heat exchange mechanism during the closing process, so that the plurality of heat exchange fins enter the defrost chamber formed after the closed defrost mechanism is closed. At the same time, during the driving process of the closed defrost mechanism, the trigger-type air intake mechanism and the trigger-type exhaust and drainage mechanism are triggered successively. After the trigger-type air intake mechanism is triggered, the hot air flow is diverted, so that the frost layer can be heated and melted from the inside and the outside respectively. After the trigger-type exhaust and drainage mechanism is triggered, the closure is released and the water after the frost layer is melted is output. Compared with the same type of device in the prior art, the present invention can accommodate and defrost a plurality of heat exchange fins by setting a defrost chamber, which can not only shorten the time required for the initial heating, but also enhance the defrosting effect, thereby effectively improving the defrosting efficiency. In addition, the water after the frost layer is melted can be output more conveniently and avoid residue under the push of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall front view of the evaporator shell of the present invention after being cut open.

[0028] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0029] Figure 3 It is a front cross-sectional structural schematic diagram of the heat exchange mechanism of the present invention.

[0030] Figure 4 It is a front cross-sectional structural schematic diagram of the air supply drive mechanism, the closed defrost mechanism and the trigger-type exhaust and drainage mechanism of the present invention.

[0031] Figure 5 It is a front cross-sectional structural schematic diagram of the trigger-type air intake mechanism of the present invention.

[0032] In the figure: 1. evaporator shell; 2. heat exchange mechanism; 21. coil; 22. heat exchange fins; 23. heat conduction sleeve; 24. traction rope; 3. air supply drive mechanism; 31. bidirectional screw; 32. hot air input pipe; 33. drive motor; 34. drive gear; 4. closed defrost mechanism; 41. closing plate; 42. closed shell; 43. dispersion chamber; 44. trigger sleeve; 45. transfer chamber; 46. dispersion hole; 5. trigger air intake mechanism; 51. first air intake hole; 52. second air intake hole; 53. first sealing ring; 54. second sealing ring; 55. fixed sleeve; 56. first spring; 57. transmission rod; 6. trigger exhaust and drainage mechanism; 61. drain trough; 62. blocking slider; 63. guide rod; 64. second spring; 65. telescopic tube. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] The present invention provides a Figures 1-5 Freon medium evaporator as shown, including an evaporator housing 1. A heat exchange mechanism 2 is arranged on the left side inside the evaporator housing 1. A gas supply driving mechanism 3 is arranged on the right side inside the evaporator housing 1. A closed defrosting mechanism 4 is jointly arranged outside the heat exchange mechanism 2 and the gas supply driving mechanism 3. A trigger type air intake mechanism 5 is drivingly arranged on the closed defrosting mechanism 4. A trigger type exhaust and drainage mechanism 6 is arranged on the closed defrosting mechanism 4.

[0036] As Figure 3 shown, the heat exchange mechanism 2 includes a coil pipe 21, heat exchange fins 22, heat conduction sliding sleeves 23 and traction ropes 24. Among them, the coil pipe 21 is fixedly arranged inside the evaporator housing 1, and the output end and the input end of the coil pipe 21 penetrate through the inner wall of the evaporator housing 1 and extend to the outside of the evaporator housing 1. A plurality of heat exchange fins 22 are arranged, and the plurality of heat exchange fins 22 are all sleeved outside the coil pipe 21. A plurality of heat conduction sliding sleeves 23 are arranged, and the plurality of heat conduction sliding sleeves 23 are evenly and slidably sleeved outside the coil pipe 21 and are respectively fixedly connected to the plurality of heat exchange fins 22. A plurality of traction ropes 24 are arranged, and the plurality of traction ropes 24 are respectively arranged on the sides of the plurality of heat exchange fins 22.

[0037] As Figure 4 shown, the gas supply driving mechanism 3 includes a bidirectional lead screw 31, a hot gas input pipe 32, a driving motor 33 and a driving gear 34. Among them, the bidirectional lead screw 31 penetrates through the outer wall of the evaporator housing 1 and extends to the inside of the evaporator housing 1, and is rotationally connected to the evaporator housing 1 through a bearing. The hot gas input pipe 32 is rotationally connected to the bidirectional lead screw 31 through a rotary joint. The driving motor 33 is fixedly arranged outside the evaporator housing 1. Two driving gears 34 are arranged, and the two driving gears 34 mesh with each other. One driving gear 34 is drivingly connected to the driving motor 33, and the other driving gear 34 is fixedly sleeved outside the bidirectional lead screw 31.

[0038] As Figure 3 And Figure 4As shown, the closed defrosting mechanism 4 includes a closing plate 41, a closed housing 42, a dispersion chamber 43, a trigger sleeve 44, a transfer chamber 45 and dispersion holes 46. Among them, the closing plate 41 is slidably sleeved outside the coil pipe 21 and is threadedly connected to the outside of the bidirectional lead screw 31. The closing plate 41 is fixedly connected to the leftmost heat exchange fin 22 through a traction rope 24. The closed housing 42 is fixedly connected to the rightmost heat exchange fin 22 through a traction rope 24. The closed housing 42 is sleeved outside the bidirectional lead screw 31 and is threadedly connected to the bidirectional lead screw 31. The dispersion chamber 43 is opened inside the closed housing 42. The trigger sleeve 44 is sleeved outside the bidirectional lead screw 31 and is fixedly arranged on the inner wall of the closed housing 42. The transfer chamber 45 is opened inside the trigger sleeve 44. There are multiple dispersion holes 46, and the multiple dispersion holes 46 are evenly opened on the inner wall of the closed housing 42. The transfer chamber 45 and the multiple dispersion holes 46 are both communicated with the dispersion chamber 43.

[0039] By setting the above structure, when the closing plate 41 moves to the right, it is convenient to push multiple heat exchange fins 22, so that the multiple heat exchange fins 22 enter the inside of the closed housing 42. At the same time, the closing plate 41 can close the opening of the closed housing 42, thereby forming a defrosting chamber inside the evaporator housing 1. When the hot air flow enters the dispersion chamber 43 through the transfer chamber 45 and then sprays out from the multiple dispersion holes 46, the frost layer can be melted from the outside.

[0040] As Figure 5 As shown, the trigger-type air intake mechanism 5 includes a first air intake hole 51, a second air intake hole 52, a first sealing ring 53, a second sealing ring 54, a fixed collar 55, a first spring 56 and a transmission rod 57. Among them, there are multiple second air intake holes 52 and second sealing rings 54. The first air intake hole 51 and the multiple second air intake holes 52 are sequentially opened on the front of the bidirectional lead screw 31 from right to left. The first sealing ring 53 is sleeved outside the bidirectional lead screw 31 and closes the first air intake hole 51. The multiple second sealing rings 54 are evenly sleeved outside the bidirectional lead screw 31 and respectively close the multiple second air intake holes 52. The fixed collar 55 is fixedly sleeved outside the bidirectional lead screw 31. The first spring 56 is sleeved outside the bidirectional lead screw 31. One end of the first spring 56 is fixedly connected to the first sealing ring 53 and the other end is fixedly connected to the fixed collar 55. There are two transmission rods 57, and the two transmission rods 57 are respectively fixedly arranged at the top left and bottom left of the first sealing ring 53. The transmission rod 57 penetrates through the multiple second sealing rings 54 and is fixedly connected to the multiple second sealing rings 54.

[0041] By setting the above structure, after the first sealing ring 53 is pushed, the first sealing ring 53 drives multiple second sealing rings 54 to move leftward through the transmission rod 57. At this time, the first sealing ring 53 releases the closure of the first air inlet hole 51, and the multiple second sealing rings 54 release the closure of the multiple second air inlet holes 52. At this time, the hot air flow inside the bidirectional lead screw 31 can be output through the first air inlet hole 51 and the multiple second air inlet holes 52, thereby completing the diversion of the hot air flow. When the first sealing ring 53 is no longer pushed subsequently, under the push of the first spring 56, the first sealing ring 53 drives the multiple second sealing rings 54 to reset through the transmission rod 57, and then closes the first air inlet hole 51 and the multiple second air inlet holes 52 again.

[0042] As Figure 4 shown, the trigger type exhaust and drainage mechanism 6 includes a discharge groove 61, a plugging slider 62, a guide rod 63, a second spring 64 and a telescopic tube 65. Among them, the discharge groove 61 is opened inside the closed housing 42, the plugging slider 62 is slidably arranged inside the discharge groove 61, the guide rod 63 is slidably penetrated and arranged at the bottom left of the closed housing 42 and is fixedly connected to the plugging slider 62, the second spring 64 is sleeved outside the guide rod 63, one end of the second spring 64 is fixedly connected to the inner wall of the discharge groove 61 and the other end is fixedly connected to the plugging slider 62, the telescopic tube 65 is fixedly penetrated and arranged at the bottom right of the closed housing 42, and one end of the telescopic tube 65 is communicated with the discharge groove 61 and the other end extends to the outside of the evaporator housing 1.

[0043] By setting the above structure, when the closing plate 41 pushes the guide rod 63, the guide rod 63 pushes the plugging slider 62 to move rightward. At this time, the plugging slider 62 releases the closure of the inlet of the discharge groove 61. Therefore, the water after the frost layer melts can enter the inside of the telescopic tube 65 through the discharge groove 61 and is finally discharged. When the guide rod 63 is no longer pushed subsequently, driven by the second spring 64, the plugging slider 62 moves leftward and closes the inlet of the discharge groove 61 again.

[0044] Embodiment 2

[0045] The present invention also provides a defrosting method for a Freon medium evaporator, which specifically includes the following steps:

[0046] S1. Start the driving motor 33. After the driving motor 33 is started, it drives the bidirectional lead screw 31 to rotate through two driving gears 34. When the bidirectional lead screw 31 rotates, it drives the closing plate 41 and the closed housing 42 to move synchronously. At this time, the closing plate 41 moves to the right and the closed housing 42 moves to the left;

[0047] S2. When the rightward movement distance of the closing plate 41 reaches the first threshold value, the closing plate 41 contacts the leftmost heat-conducting sliding sleeve 23, and pushes the frosted heat-exchanging fins 22 through the heat-conducting sliding sleeve 23, so that a plurality of heat-exchanging fins 22 slide to the right along the coil pipe 21. At this time, the plurality of heat-exchanging fins 22 approach each other and are arranged evenly.

[0048] S3. When the rightward movement distance of the closing plate 41 reaches the second threshold value, the closing housing 42 drives the trigger sleeve 44 to push the first sealing ring 53. After the first sealing ring 53 is pushed, the first spring 56 is compressed. At the same time, a plurality of second sealing rings 54 are driven to move leftward through the transmission rod 57. When the rightward movement distance of the closing plate 41 reaches the third threshold value, the first sealing ring 53 releases the blockage of the first air inlet hole 51, and a plurality of second sealing rings 54 release the blockage of a plurality of second air inlet holes 52. The hot air output by the hot air input pipe 32 enters the inside of the bidirectional lead screw 31 and is output through the first air inlet hole 51 and a plurality of second air inlet holes 52. At this time, the first air inlet hole 51 is located inside the trigger sleeve 44. Therefore, the hot air output from the first air inlet hole 51 enters the inside of the dispersion chamber 43 through the transfer chamber 45 and is then output through a plurality of dispersion holes 46.

[0049] S4. When the rightward movement distance of the closing plate 41 reaches the fourth threshold value, the closing plate 41 starts to push the guide rod 63. After the guide rod 63 is pushed, it drives the blocking slider 62 to move rightward. At this time, the second spring 64 is stretched. When the rightward movement distance of the closing plate 41 reaches the fifth threshold value, the closing plate 41 contacts the closing housing 42, and the closing plate 41 closes the opening of the closing housing 42. At this time, the blocking slider 62 releases the blockage of the inlet of the discharge groove 61, and then the driving motor 33 is stopped.

[0050] S5. At this time, a plurality of heat-exchanging fins 22 are all located in the defrosting chamber formed by the closing plate 41 and the closing housing 42. The hot air flow output from a plurality of dispersion holes 46 flushes the frost layer outside the heat-exchanging fins 22 from the outside, and the hot air flow output from a plurality of second air inlet holes 52 flushes the frost layer outside the heat-exchanging fins 22 from the inside. The water after the frost layer melts enters the inside of the discharge groove 61 through the opening of the discharge groove 61 and is then output through the telescopic pipe 65 under the drive of the air flow.

[0051] S6. After defrosting is completed, the driving motor 33 is driven to drive the bidirectional lead screw 31 to rotate reversely, so that the closing plate 41 resets to the left, and the closing housing 42 resets to the right. During the reset process of the closing plate 41 and the closing housing 42, the heat-exchanging fins 22 are pulled through the traction rope 24, so that a plurality of heat-exchanging fins 22 are reset synchronously.

[0052] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A Freon medium evaporator, comprising an evaporator housing, characterized in that: On the left side inside the evaporator housing, there is a heat exchange mechanism. On the right side inside the evaporator housing, there is a gas supply driving mechanism. Outside the heat exchange mechanism and the gas supply driving mechanism, there is a closed defrosting mechanism. A trigger type air intake mechanism is drivingly arranged on the closed defrosting mechanism. A trigger type exhaust and drainage mechanism is arranged on the closed defrosting mechanism; The heat exchange mechanism includes a coil pipe, heat exchange fins, heat conduction sliding sleeves and traction ropes; The coil pipe is fixedly arranged inside the evaporator housing, and the output end and the input end of the coil pipe penetrate through the inner wall of the evaporator housing and extend to the outside of the evaporator housing. A plurality of heat exchange fins are provided, and the plurality of heat exchange fins are all sleeved outside the coil pipe. A plurality of heat conduction sliding sleeves are provided, and the plurality of heat conduction sliding sleeves are evenly slidably sleeved outside the coil pipe and are respectively fixedly connected to the plurality of heat exchange fins. A plurality of traction ropes are provided, and the plurality of traction ropes are respectively arranged on the sides of the plurality of heat exchange fins; The gas supply driving mechanism includes a bidirectional lead screw, a hot gas input pipe, a driving motor and a driving gear; The bidirectional lead screw penetrates through the outer wall of the evaporator housing and extends to the inside of the evaporator housing, and is rotatably connected to the evaporator housing through a bearing. The hot gas input pipe is rotatably connected to the bidirectional lead screw through a rotary joint. The driving motor is fixedly arranged outside the evaporator housing. Two driving gears are provided, and the two driving gears mesh with each other. One driving gear is in transmission connection with the driving motor, and the other driving gear is fixedly sleeved outside the bidirectional lead screw; The closed defrosting mechanism includes a closing plate, a closed housing, a dispersion chamber, a trigger sleeve, a transfer chamber and dispersion holes; The closing plate is slidably sleeved outside the coil pipe and is threadedly connected to the outside of the bidirectional lead screw. The closing plate is fixedly connected to the leftmost heat exchange fin through a traction rope. The closed housing is fixedly connected to the rightmost heat exchange fin through a traction rope. The closed housing is sleeved outside the bidirectional lead screw and is threadedly connected to the bidirectional lead screw. The dispersion chamber is opened inside the closed housing. The trigger sleeve is sleeved outside the bidirectional lead screw and is fixedly arranged on the inner wall of the closed housing. The transfer chamber is opened inside the trigger sleeve. A plurality of dispersion holes are provided, and the plurality of dispersion holes are evenly opened on the inner wall of the closed housing. The transfer chamber and the plurality of dispersion holes are both communicated with the dispersion chamber; The trigger type air intake mechanism includes a first air intake hole, a second air intake hole, a first sealing ring, a second sealing ring, a fixed collar, a first spring and a transmission rod; The second air inlet holes and the second sealing rings are both provided with a plurality of. The first air inlet hole and the plurality of second air inlet holes are sequentially opened on the front surface of the bidirectional lead screw from right to left. The first sealing ring is sleeved on the outer side of the bidirectional lead screw and closes the first air inlet hole. The plurality of second sealing rings are evenly sleeved on the outer side of the bidirectional lead screw and respectively close the plurality of second air inlet holes. The fixed collar is fixedly sleeved on the outer side of the bidirectional lead screw. The first spring is sleeved on the outer side of the bidirectional lead screw. One end of the first spring is fixedly connected to the first sealing ring and the other end is fixedly connected to the fixed collar. There are two transmission rods. The two transmission rods are respectively fixedly arranged at the top left and the bottom left of the first sealing ring. The transmission rods penetrate through the plurality of second sealing rings and are fixedly connected to the plurality of second sealing rings.

2. The Freon medium evaporator according to claim 1, characterized in that: The trigger-type exhaust and drainage mechanism includes a discharge groove, a plugging slider, a guide rod, a second spring and a telescopic tube.

3. The Freon medium evaporator according to claim 2, characterized in that: The discharge groove is opened inside the closed housing. The plugging slider is slidably arranged inside the discharge groove. The guide rod is slidably penetrated through the bottom left of the closed housing and is fixedly connected to the plugging slider. The second spring is sleeved on the outer side of the guide rod. One end of the second spring is fixedly connected to the inner wall of the discharge groove and the other end is fixedly connected to the plugging slider. The telescopic tube is fixedly penetrated through the bottom right of the closed housing. One end of the telescopic tube is communicated with the discharge groove and the other end extends to the outside of the evaporator housing.

4. The defrosting method of a Freon medium evaporator according to claim 3, characterized in that, Specifically, it includes the following steps: S1. Start the drive motor. After the drive motor starts, it drives the bidirectional lead screw to rotate through two drive gears. When the bidirectional lead screw rotates, it drives the closing plate and the closed housing to move synchronously. At this time, the closing plate moves to the right and the closed housing moves to the left. S2. When the rightward movement distance of the closing plate reaches the first threshold, the closing plate contacts the leftmost heat conduction sliding sleeve and pushes the frosting heat exchange fins through the heat conduction sliding sleeve, so that the plurality of heat exchange fins slide to the right along the coil pipe. At this time, the plurality of heat exchange fins approach each other and are evenly arranged. S3. When the rightward movement distance of the closing plate reaches the second threshold, the closed housing drives the trigger sleeve to push the first sealing ring. After the first sealing ring is pushed, it compresses the first spring. At the same time, it drives the plurality of second sealing rings to move leftward through the transmission rod. When the rightward movement distance of the closing plate reaches the third threshold, the first sealing ring releases the plugging of the first air inlet hole, and the plurality of second sealing rings release the plugging of the plurality of second air inlet holes. The hot air output by the hot air input pipe enters the inside of the bidirectional lead screw and is output through the first air inlet hole and the plurality of second air inlet holes. At this time, the first air inlet hole is located inside the trigger sleeve. Therefore, the hot air output from the first air inlet hole enters the inside of the dispersion cavity through the transfer cavity and is then output through the plurality of dispersion holes. S4. When the rightward movement distance of the closing plate reaches the fourth threshold, the closing plate starts to push the guide rod. After the guide rod is pushed, it drives the plugging slider to move to the right. At this time, the second spring is stretched. When the rightward movement distance of the closing plate reaches the fifth threshold, the closing plate contacts the closed housing, and the closing plate closes the opening of the closed housing. At this time, the plugging slider releases the plugging of the inlet of the discharge groove, and then the drive motor is stopped. S5. At this time, multiple heat exchange fins are all located in the defrosting chamber formed by the closing plate and the closed housing. The hot air flows output from the multiple dispersion holes scour the frost layer outside the heat exchange fins from the outside, and the hot air flows output from the multiple second air intake holes scour the frost layer outside the heat exchange fins from the inside. The water after the frost layer melts enters the inside of the discharge groove through the discharge groove opening, and then is output through the telescopic pipe under the drive of the air flow. S6. After the defrosting is completed, the driving motor is made to drive the bidirectional lead screw to rotate reversely, so that the closing plate is reset to the left, and the closed housing is reset to the right. During the resetting process of the closing plate and the closed housing, the heat exchange fins are pulled by the traction rope, so that the multiple heat exchange fins are reset synchronously.

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