A combined pre-cooling evaporator

Abstract

The present invention provides a combined pre-cooling evaporator applied to the field of refrigeration evaporator, comprising an air inlet duct with an auxiliary evaporator and an air outlet duct with a main evaporator, the output end of the air inlet duct is connected with a connecting elbow, the input end of the air outlet duct is connected with a diverter bellows, the connecting elbow is connected to the diverter bellows, and an air supply system is arranged in the diverter bellows; the air supply system comprises a driving motor and a blower blade, and an air hood is also sleeved on the outer side of the driving motor; the diverter bellows comprises a bellows shell, a diverter air plate is arranged in the bellows shell, the diverter air plate divides the bellows shell into a side air bin and a main air bin, and the diverter air plate is used for diverting the output air of the blower blades into the air hood. The present application avoids local overheating or overcooling through the segmented design of the auxiliary evaporator and the main evaporator, greatly improves the heat exchange efficiency, and the heat exchange efficiency of the evaporator can be effectively improved, thereby improving the refrigeration capacity of the air-conditioning system.

Description

Technical Field

[0001] The present application relates to the field of refrigeration evaporators, and in particular to a combined pre-cooling evaporator. Background Art

[0002] In traditional refrigeration and air handling systems, the evaporator, as a key component, is responsible for exchanging heat between the refrigerant and the air, thereby achieving functions such as cooling and dehumidification.

[0003] In the field of construction machinery refrigeration, such as excavators, loaders, cranes, etc., due to their harsh working environment and heavy workload, extremely stringent requirements are placed on the evaporator of the vehicle air conditioning system. Construction machinery refrigeration often operates under conditions such as high temperature, high dust, high vibration and complex terrain, which poses many challenges to traditional evaporators.

[0004] The heat dissipation efficiency of traditional evaporators drops sharply in high temperature environments. The long-term operation of the drive motor of the engineering machinery refrigeration generates a lot of heat, and the ambient temperature often exceeds 40°C or even higher due to the scorching sun outdoors. The air supply motor of the ordinary evaporator heat dissipation is difficult to operate efficiently under high temperature conditions, resulting in a significant reduction in the cooling capacity of the air conditioning system, and the temperature in the cab cannot be effectively reduced, which seriously affects the driver's work comfort and efficiency.

[0005] For this purpose, a combined pre-cooling evaporator is proposed. Summary of the invention

[0006] The purpose of the present application is to solve the technical problem that the air supply motor of the evaporator of the engineering machinery refrigeration has low refrigeration efficiency under high temperature conditions. Compared with the prior art, a combined pre-cooling evaporator is provided, including an air inlet pipe with an auxiliary evaporator and an air outlet pipe with a main evaporator, the output end of the air inlet pipe is connected with a connecting elbow, the input end of the air outlet pipe is connected with a splitter air box, the output end of the connecting elbow is connected with the input end of the splitter air box, and the splitter air box has an air supply system for drawing air in the air inlet pipe into the air outlet pipe;

[0007] The air supply system includes a driving motor and a blast blade, wherein the driving motor is used to drive the blast blade to rotate in the split air box, and an air hood is sleeved on the outer side of the driving motor, and the output end of the air hood extends to the outside;

[0008] The split air box comprises a bellows shell, two groups of split air plates are symmetrically arranged in the bellows shell, the two groups of split air plates are symmetrically rotatably connected to the inner side of the bellows shell, the ends of the split air plates are elastically connected to elastic skirt plates, the split air plates divide the bellows shell into a side wind bin and a main wind bin, the bellows shell is symmetrically provided with two groups of side air ports on the top of the side wind bin, and the side air ports are connected to the wind cover through an air guide pipe;

[0009] The two groups of split air plates are used to split the output air of the blast blades into the air hood.

[0010] Furthermore, the split air plate includes a semicircular portion and an arcuate portion, the semicircular portion of the split air plate is provided with two sets of guide sliders, the bellows housing is provided with an arcuate slide matching the guide sliders, and a matching spring is further provided between the arcuate slide and the guide slider;

[0011] The engaging spring has an elastic force for driving the two groups of diverter air plates to approach each other.

[0012] Furthermore, the bellows shell is provided with a circular outer wall corresponding to the semicircular portion of the diverter air plate, and a wind groove is provided between the circular outer wall of the bellows shell and the semicircular portion of the diverter air plate, a fixed wind shield strip is fixed in the wind groove, and dynamic wind shield strips are fixed on the opposite sides of the semicircular portions of the two groups of diverter air plates.

[0013] Furthermore, the arc-shaped portion of the split air plate is fixed with a sealing plate matching the side air outlet;

[0014] The elastic skirt plate is elastically connected to the end of the split air plate through a rubber connector, and the rubber connector has an elastic force that drives the elastic skirt plate to approach the split air plate;

[0015] The elastic skirt plate is also provided with a plurality of one-way diaphragms, and the one-way diaphragms have a one-way conductivity that allows external air to be introduced into the side air bin in one direction.

[0016] Furthermore, the air inlet pipe is fixed with a first filter element on the air inlet side of the auxiliary evaporator, and the air outlet pipe is fixed with a second filter element on the air inlet side of the main evaporator;

[0017] The top of the blast blade is rotatably connected to the inside of the bellows housing. A cleaning system for cleaning impurities attached to the first filter element and the second filter element is also provided inside the blast blade. A first driven gear is also provided on the top of the blast blade.

[0018] Furthermore, the cleaning system includes a conduit, a negative pressure seat and a discharge seat, the output end of the drive motor is fixed with a spline shaft, the bottom of the wind cover is fixed with an electromagnet, the output end of the drive motor is slidably connected with a transmission seat in the vertical direction, the top of the transmission seat is provided with a spline groove matching the spline shaft, the outer wall of the transmission seat is fixed with a drive gear and a first magnetic ring, the drive gear is meshed with the first driven gear, and the inner wall of the transmission seat is provided with a plurality of air ducts evenly distributed at equal angles;

[0019] The negative pressure seat is integrally rotatably connected to the inner wall of the blast blade, a negative pressure blade is arranged in the negative pressure seat, a conical cover is fixed to the top of the negative pressure blade, a shearing tooth is arranged on the top of the conical cover, the top of the conical cover is slidably connected to the bottom of the transmission seat, and the wind cover is connected to the conical cover through an air duct;

[0020] A return spring is clamped between the transmission seat and the negative pressure seat. The return spring has an elastic force to drive the transmission seat to move upward. A second driven gear that matches the driving gear is also provided on the top of the negative pressure seat.

[0021] Further, the conduit is used to guide the airflow output by the negative pressure blade to the outside, the discharge seat is fixed on the connecting elbow, the conduit is slidably connected between the negative pressure seat and the discharge seat, a second magnetic ring is fixed on the top of the conduit, a plurality of pressurized inner holes evenly arranged at equal angles are provided in the middle of the conduit, a pressurized outer hole matching the pressurized inner hole is provided on the discharge seat, a plurality of discharge top holes evenly arranged at equal angles are provided at the bottom of the conduit, and a bottom plate is rotatably connected to the bottom of the conduit, and a discharge bottom hole matching the discharge top hole is provided on the bottom plate;

[0022] The bottom of the discharge seat extends to the outside of the connecting elbow and is provided with a discharge port matched with the discharge top hole.

[0023] Furthermore, a tension spring is clamped between the bottom plate and the discharge seat, and the tension spring has an elastic force that drives the conduit to move upward and away from the discharge seat.

[0024] Furthermore, the inner wall of the discharge seat is provided with a plurality of limit grooves evenly spaced at equal angles, a limit sliding block matching the limit grooves is fixed on the bottom plate, the inner wall of the discharge seat is also provided with a plurality of spiral grooves evenly spaced at equal angles at the top of the limit grooves, and the outer wall of the conduit is provided with a ball matching the spiral grooves.

[0025] Furthermore, the sliding distance of the catheter between the negative pressure seat and the discharge seat has three sections. When the catheter is located at the high section height, the pressurized inner hole and the pressurized outer hole are alternately closed, and the discharge top hole and the discharge bottom hole are overlapped and opened; when the catheter is located at the middle section height, the pressurized inner hole and the pressurized outer hole are alternately closed, and the discharge top hole and the discharge bottom hole are overlapped and opened; when the catheter is located at the low section height, the pressurized inner hole and the pressurized outer hole are overlapped and opened, and the discharge top hole and the discharge bottom hole are alternately closed.

[0026] Compared with the prior art, the advantages of this application are:

[0027] The present application uses a splitter bellows design to allow the air to be reasonably split and evenly distributed. The adaptive adjustment of the splitter plate under the impact of the airflow and the coordination of the fixed windshield strip and the dynamic windshield strip ensure that the air flows evenly on the surface of the main evaporator and the auxiliary evaporator, avoiding local overheating or overcooling, and greatly improving the heat exchange efficiency. Compared with the traditional evaporator, the heat exchange efficiency of the evaporator of the present invention can be effectively improved, thereby improving the refrigeration capacity of the air-conditioning system. Even when the refrigeration motor of the engineering vehicle is running at high load for a long time and the external ambient temperature is extremely high, the cab can still maintain a relatively comfortable temperature;

[0028] At the same time, the cleaning system of the present invention can realize automatic cleaning of the first filter element and the second filter element, and can respectively realize impurity discharge and strong blowing of the filter element. The cleaning system can remove large particle impurities attached to the surface of the filter element, effectively extending the service life of the filter element, reducing the frequency of manual cleaning, reducing maintenance workload and cost, and improving the convenience and economy of engineering vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of this application;

[0030] Figure 2 This is a schematic diagram of the explosion structure of this application;

[0031] Figure 3 It is a schematic diagram of the cross-sectional structure of this application;

[0032] Figure 4 This is a schematic diagram of the internal wind direction of this application;

[0033] Figure 5 A schematic diagram of the internal structure of the air supply system proposed in this application;

[0034] Figure 6 It is a schematic diagram of the exploded structure of the air supply system and the diversion bellows proposed in this application;

[0035] Figure 7 It is a schematic diagram of the cross-sectional structure of the split flow bellows proposed in this application;

[0036] Figure 8 for Figure 7 A schematic diagram of the enlarged structure of the middle B part;

[0037] Fig. 9 A schematic diagram of the air supply direction of the split air box proposed in this application when the split air plates are far away from each other;

[0038] Fig.10 It is a schematic diagram of the exploded structure of the air supply system and the cleaning system proposed in this application;

[0039] Fig.11It is a schematic diagram of the explosion structure of the cleaning system proposed in this application;

[0040] Fig.12 It is a schematic cross-sectional structure diagram of the conduit and the discharge seat proposed in this application;

[0041] Fig.13 A schematic diagram of the bottom structure of the catheter proposed in this application;

[0042] Fig.14 It is a schematic cross-sectional structure diagram of the negative pressure seat proposed in this application;

[0043] Fig.15 It is a cross-sectional structural schematic diagram of the air supply system and the cleaning system proposed in this application;

[0044] Fig.16 for Fig.15 A schematic diagram of the enlarged structure of the middle part A;

[0045] Fig.17 It is a schematic diagram of the air supply direction of the diversion air box proposed in this application when the diversion air plates are close to each other.

[0046] Description of the numbers in the figure:

[0047] 1. Air inlet pipe; 11. Auxiliary evaporator; 12. First filter element;

[0048] 2. Air outlet pipe; 21. Main evaporator; 22. Second filter element;

[0049] 3. Connect the elbow;

[0050] 4. Diverter bellows; 401. Side wind chamber; 402. Main wind chamber; 403. Wind slot; 41. Bellows housing; 411. Side air outlet; 412. Arc slide; 413. Matching spring; 414. Fixed wind shield; 42. Diverter plate; 421. Closing plate; 422. Guide slider; 423. Moving wind shield; 43. Elastic skirt; 431. One-way diaphragm;

[0051] 5. air supply system; 51. wind cover; 511. electromagnet; 52. driving motor; 521. transmission seat; 5211. air duct; 5212. driving gear; 522. spline shaft; 523. first magnetic ring; 53. air guide pipe; 54. blast blade; 541. first driven gear;

[0052] 6. Cleaning system; 61. Conduit; 611. Pressurized inner hole; 612. Second magnetic ring; 613. Ball; 614. Discharge top hole; 62. Negative pressure seat; 621. Negative pressure blade; 622. Second driven gear; 623. Conical cover; 624. Shearing tooth; 625. Reset spring; 63. Discharge seat; 631. Pressurized outer hole; 632. Spiral groove; 633. Limiting groove; 634. Discharge port; 64. Bottom plate; 641. Discharge bottom hole; 642. Limiting slider; 65. Tensioning spring. DETAILED DESCRIPTION

[0053] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0054] Embodiment: The present invention provides a combined pre-cooling evaporator, see Figure 1 - Fig.17 , including an air inlet pipe 1 with an auxiliary evaporator 11 and an air outlet pipe 2 with a main evaporator 21. It should be noted that the main evaporator 21 and the auxiliary evaporator 11 have two combinations of an integrated type and a split type. In this embodiment, the main evaporator 21 and the auxiliary evaporator 11 adopt a split type combination structure, driven by a single refrigeration compressor for refrigeration, the output end of the air inlet pipe 1 is connected with a connecting elbow 3, the input end of the air outlet pipe 2 is connected with a split air box 4, the output end of the connecting elbow 3 is connected with the input end of the split air box 4, the connecting elbow 3 is made of high-strength, vibration-resistant metal material, such as stainless steel, its bending structure is optimized by fluid mechanics, the internal surface is smooth and streamlined, reducing air flow resistance and vortex generation, ensuring that air enters the split air box 4 smoothly from the air inlet pipe 1. The two end connection parts of the connecting elbow 3 adopt a flange connection method with double sealing of welding and sealant to prevent air leakage and loosening caused by vibration, and ensure the normal operation and heat exchange efficiency of the system.

[0055] An air supply system 5 is provided in the split air box 4, and the air supply system 5 is used to draw the air in the air inlet pipe 1 into the air outlet pipe 2. The air supply system 5 includes a driving motor 52 and a blast blade 54. The driving motor 52 is used to drive the blast blade 54 to rotate in the split air box 4. A wind cover 51 is also sleeved on the outer side of the driving motor 52, and the output end of the wind cover 51 extends to the outside.

[0056] In the present application, a segmented design of the main evaporator 21 and the auxiliary evaporator 11 is adopted. In the refrigeration stage, pre-cooling can be performed in advance through the auxiliary evaporator 11, and the low temperature generated by the auxiliary evaporator 11 is used to exchange heat inside the entire air inlet pipe 1 and the air outlet pipe 2 to offset the high temperature generated during the operation of the engineering vehicle. When pre-cooled to the design temperature, the main evaporator 21 works, and the auxiliary evaporator 11 can be selectively opened and closed according to the working conditions, and then the auxiliary evaporator 11 and the main evaporator 21 can work in coordination, so that the refrigeration system of the engineering vehicle can reach the target refrigeration temperature with low energy consumption.

[0057] The split air box 4 includes a bellows housing 41, in which two groups of split air plates 42 are symmetrically arranged, and the two groups of split air plates 42 are symmetrically rotatably connected to the inner side of the bellows housing 41. It should be noted that the rotation axis of the split air plate 42 is coaxially arranged with the rotation axis of the blast blade 54, and the ends of the split air plate 42 are elastically connected with elastic skirt plates 43. The split air plate 42 divides the inside of the bellows housing 41 into a side wind bin 401 and a main wind bin 402. The bellows housing 41 is symmetrically provided with two groups of side air ports 411 at the top of the side wind bin 401, and the side air ports 411 are connected to the wind hood 51 through an air guide 53.

[0058] The two groups of wind diversion plates 42 are used to divert the output wind of the blast blades 54 into the wind cover 51 .

[0059] In this example, the cold air delivered by the auxiliary evaporator 11 can be diverted into the wind hood 51 through the diverter air plate 42 to dissipate the heat for the drive motor 52 in the wind hood 51, thereby improving the heat dissipation efficiency of the drive motor 52 without losing the refrigeration effect of the main evaporator 21, so that the drive motor 52 can drive the blower blade 54 to rotate at a speed that does not stall and can operate stably under high temperature conditions.

[0060] For details, please refer to Figure 2 - Fig. 9 The diverter plate 42 includes a semicircular portion and an arcuate portion. The semicircular portion of the diverter plate 42 is provided with two groups of guide sliders 422. The bellows housing 41 is provided with an arcuate slide groove 412 matching the guide slider 422. A matching spring 413 is also provided between the arcuate slide groove 412 and the guide slider 422. The matching spring 413 has an elastic force that drives the two groups of diverter plates 42 to approach each other. When the airflow generated by the blast blade 54 impacts, the diverter plate 42 can be appropriately slid and adjusted in the arcuate slide groove 412 to accurately divert the airflow.

[0061] Among them, a circular outer wall corresponding to the semicircular part of the diverter air plate 42 is provided on the bellows shell 41, and an air groove 403 is provided between the circular outer wall of the bellows shell 41 and the semicircular part of the diverter air plate 42. A fixed wind shield 414 is fixed in the wind groove 403, and dynamic wind shields 423 are fixed on the opposite side of the semicircular parts of the two groups of diverter air plates 42.

[0062] Furthermore, the arc-shaped portion of the split air plate 42 is fixed with a sealing plate 421 matching the side air outlet 411; the elastic skirt plate 43 is elastically connected to the end of the split air plate 42 through a rubber connector, and the rubber connector has an elastic force that drives the elastic skirt plate 43 to approach the split air plate 42;

[0063] A number of one-way diaphragms 431 are also provided on the elastic skirt plate 43. The one-way diaphragms 431 have unidirectional conductivity to allow external air to be introduced into the side wind bin 401 in one direction. When the blower blades 54 are working, part of the air flows into the side wind bin 401. When the pressure of the side wind bin 401 decreases, the external air is replenished through the one-way diaphragms 431 to stabilize the airflow in the side wind bin 401 and optimize the air diversion and evaporator performance.

[0064] When the blower blades 54 are in operation, the wind pressure generated will squeeze the two groups of split air plates 42, causing the two groups of split air plates 42 to overcome the elastic force of the matching springs 413 and move away from each other. At this time, the main air bin 402 is opened to deliver air to the air outlet 2. When the driving motor 52 is running at a high temperature, the rotation speed of the blower blades 54 is reduced. Under the premise of reduced air supply, the two groups of split air plates 42 are close to each other using the elastic force of the matching springs 413. At this time, the sealing plate 421 follows the rotation of the split air plate 42 and separates from the side air outlet 411, so that the side air outlet 411 is open. At the same time, the relative gap between the semicircular parts of the two groups of split air plates 42 also follows the rotation of the split air plate 42 and is open. At this time, the wind pressure generated by the blower blades 54 is diverted to the side air bin 401 and is input into the wind hood 51 using the air guide pipe 53. As the temperature of the driving motor 52 decreases, the operating speed of the blower blades 54 is increased, and the two groups of split air plates 42 are again separated from each other to the maximum stroke.

[0065] It should be noted that, in the present embodiment, the air volume delivered to the wind hood 51 by the side wind bin 401 is self-controlled by the operating temperature of the drive motor 52. When the temperature is higher, the relative air volume delivered to the drive motor 52 is larger, thereby realizing a self-feedback intelligent cooling effect, and further maintaining the stable operation of the drive motor 52 under high temperature conditions.

[0066] See also Figure 2 The air inlet pipe 1 is fixed with a first filter element 12 on the air inlet side of the auxiliary evaporator 11, and the air outlet pipe 2 is fixed with a second filter element 22 on the air inlet side of the main evaporator 21;

[0067] It should be noted that the first filter element 12 adopts a multi-layer composite structure, including a coarse-effect metal filter for intercepting large particles of sand and gravel, a medium-effect fiber filter paper for filtering smaller dust, and an activated carbon adsorption layer for removing odor and harmful gases. Through multi-layer filtration, impurities in the air are effectively removed, the surface of the auxiliary evaporator 11 is protected, and the air quality is improved. The second filter element 22 uses high-efficiency moisture-proof and antibacterial filter paper materials, such as nano silver ion antibacterial filter paper, to further filter the residual impurities, microorganisms and condensed water mist in the air after being treated by the main evaporator 21, ensuring that the output air is dry, clean and sterile, meeting the comfortable environment requirements in the cab of engineering vehicles.

[0068] See also Figure 5 - Figure 6 The top of the blast blade 54 is rotatably connected to the inside of the bellows housing 41 . A cleaning system 6 for cleaning impurities attached to the first filter element 12 and the second filter element 22 is also provided inside the blast blade 54 . A first driven gear 541 is also provided on the top of the blast blade 54 .

[0069] For details, please refer to Fig.10 - Fig.17 The cleaning system 6 includes a conduit 61, a negative pressure seat 62 and a discharge seat 63. A spline shaft 522 is fixed to the output end of the driving motor 52. An electromagnet 511 is fixed to the bottom of the wind cover 51. The output end of the driving motor 52 is slidably connected to a transmission seat 521 in the vertical direction. A spline groove matching the spline shaft 522 is provided on the top of the transmission seat 521. A driving gear 5212 and a first magnetic ring 523 are fixed to the outer wall of the transmission seat 521. The driving gear 5212 is meshed with the first driven gear 541. The inner wall of the transmission seat 521 is provided with a plurality of air ducts 5211 evenly distributed at equal angles.

[0070] The negative pressure seat 62 is integrally rotatably connected to the inner wall of the blast blade 54, a negative pressure blade 621 is arranged in the negative pressure seat 62, a conical cover 623 is fixed to the top of the negative pressure blade 621, a shearing tooth 624 is arranged on the top of the conical cover 623, the top of the conical cover 623 is slidably connected to the bottom of the transmission seat 521, and the wind cover 51 is connected to the conical cover 623 through the air duct 5211;

[0071] A return spring 625 is clamped between the transmission seat 521 and the negative pressure seat 62 . The return spring 625 has elastic force to drive the transmission seat 521 to move upward. A second driven gear 622 matching the driving gear 5212 is also provided on the top of the negative pressure seat 62 .

[0072] The conduit 61 is used to guide the airflow output by the negative pressure blade 621 to the outside, the discharge seat 63 is fixed on the connecting elbow 3, the conduit 61 is slidably connected between the negative pressure seat 62 and the discharge seat 63, a second magnetic ring 612 is fixed on the top of the conduit 61, a plurality of pressurized inner holes 611 are arranged evenly at equal angles in the middle of the conduit 61, a pressurized outer hole 631 matching the pressurized inner hole 611 is provided on the discharge seat 63, a plurality of discharge top holes 614 are arranged evenly at equal angles at the bottom of the conduit 61, and a bottom plate 64 is rotatably connected to the bottom of the conduit 61, and a discharge bottom hole 641 matching the discharge top hole 614 is provided on the bottom plate 64;

[0073] The bottom of the discharge seat 63 extends to the outside of the connecting elbow 3 and is provided with a discharge port 634 that matches the discharge top hole 614 .

[0074] It should be noted that a tension spring 65 is clamped between the bottom plate 64 and the discharge seat 63 , and the tension spring 65 has an elastic force to drive the guide tube 61 to move upward and away from the discharge seat 63 .

[0075] Furthermore, the inner wall of the discharge seat 63 is provided with a plurality of limit grooves 633 evenly spaced at equal angles, a limit slider 642 matching the limit groove 633 is fixed on the bottom plate 64, the inner wall of the discharge seat 63 is also provided with a plurality of spiral grooves 632 evenly spaced at equal angles at the top of the limit groove 633, and the outer wall of the conduit 61 is provided with a ball 613 matching the spiral groove 632.

[0076] It should be noted that the sliding distance of the catheter 61 between the negative pressure seat 62 and the discharge seat 63 has three sections. When the catheter 61 is located at the high section height, the pressurized inner hole 611 and the pressurized outer hole 631 are alternately closed, and the discharge top hole 614 and the discharge bottom hole 641 are overlapped and opened; when the catheter 61 is located at the middle section height, the pressurized inner hole 611 and the pressurized outer hole 631 are alternately closed, and the discharge top hole 614 and the discharge bottom hole 641 are overlapped and opened; when the catheter 61 is located at the low section height, the pressurized inner hole 611 and the pressurized outer hole 631 are overlapped and opened, and the discharge top hole 614 and the discharge bottom hole 641 are alternately closed.

[0077] During the specific cleaning process, when the blower blade 54 runs at high power and the generated wind pressure is still not enough to keep the two groups of diverter plates 42 away, the vehicle control computer can determine by itself that the first filter element 12 and the second filter element 22 are in a highly blocked state. At this time, the vehicle control computer energizes the electromagnet 511 to generate a magnetic field to repel the first magnetic ring 523, causing the transmission seat 521 to overcome the elastic force of the reset spring 625 and slide downward, thereby disengaging the blower blade 54 from the drive motor 52. The spline shaft 522 cooperates with the spline groove of the transmission seat 521, and the power of the drive motor 52 is transmitted to the transmission seat 521 via the spline shaft 522. The transmission seat 521 drives the drive gear 5212 to rotate, and then the negative pressure blade 621 in the negative pressure seat 62 rotates through the second driven gear 622.

[0078] The negative pressure blade 621 rotates to generate negative pressure. At the same time, since the blower blade 54 stops rotating, the two groups of diverter air plates 42 approach each other to the maximum stroke. At this time, the main wind bin 402 is completely closed, and the dynamic wind shield strip 423 on the diverter air plate 42 is aligned with the fixed wind shield strip 414 to close the wind slot 403. At this time, the negative pressure blade 621 rotates to generate negative pressure, and air is sucked into the wind cover 51 from the air inlet side of the second filter element 22. As the inhalation proceeds, impurities enter the negative pressure seat 62 with the air, and are crushed and sheared by the shearing teeth 624 that rotate with the negative pressure blade 621, and then discharged through the duct 61.

[0079] It should be noted that during the sliding of the duct 61, different airflow control functions are realized at different heights, and the distance that the duct 61 slides up and down is jointly controlled by the electromagnet 511, the second magnetic ring 612 and the tensioning spring 65. When the duct 61 is at a high height, that is, the electromagnet 511 is not energized, the pressurized inner hole 611 and the pressurized outer hole 631 are alternately closed, and the discharge top hole 614 and the discharge bottom hole 641 are overlapped and opened. At this time, the cleaning system 6 does not work, and is mainly used to release the wind that is delivered to the wind hood 51 by the side wind bin 401 and undergoes heat exchange.

[0080] When the conduit 61 is at the middle height, the pressurized inner hole 611 and the pressurized outer hole 631 are alternately closed, and the discharge top hole 614 and the discharge bottom hole 641 are overlapped and opened, mainly to discharge the impurity-containing air sucked in by the negative pressure through the discharge bottom hole 641;

[0081] When there is no impurity to be removed from the second filter element 22, the electromagnet 511 increases the magnetic force, so that when the conduit 61 is at a low height, the pressurized inner hole 611 and the pressurized outer hole 631 overlap and open, and the discharge top hole 614 and the discharge bottom hole 641 are staggered and closed, and the air in the wind cover 51 enters the negative pressure seat 62 through the air duct 5211 and the conical cover 623, and then passes through the overlap area of ​​the pressurized inner hole 611 and the pressurized outer hole 631 to form a high-speed airflow, which strongly blows the air inlet side of the first filter element 12 to remove the attached stubborn impurities, realize automatic cleaning, increase the service life and filtration efficiency of the filter element, and reduce the frequency and cost of manual maintenance.

[0082] The present application uses the design of the diverter air box 4 to allow the air to be reasonably diverted and evenly distributed therein. The adaptive adjustment of the diverter air plate 42 under the impact of the airflow and the coordination of the fixed windshield strip 414 and the dynamic windshield strip 423 ensure that the air flows evenly on the surface of the main evaporator 21 and the auxiliary evaporator 11, avoiding local overheating or overcooling, and greatly improving the heat exchange efficiency. Compared with the traditional evaporator, the heat exchange efficiency of the evaporator of the present invention can be effectively improved, thereby improving the refrigeration capacity of the air conditioning system, and even when the refrigeration motor of the engineering vehicle is running at high load for a long time and the external ambient temperature is extremely high, the cab can still maintain a relatively comfortable temperature.

[0083] The double filtration system composed of the first filter element 12 of the air inlet pipe 1 and the second filter element 22 of the air outlet pipe 2 effectively removes dust, impurities, odors and harmful gases in the air. On the one hand, the clean air reduces the dirt adhesion on the surface of the evaporator and maintains the good heat exchange performance of the evaporator; on the other hand, the purified air improves the air quality in the cab, creates a healthy and fresh working environment for the driver, reduces the driver's fatigue and health problems caused by air pollution, and indirectly improves the safety and efficiency of engineering operations.

[0084] This application targets high-dust environments of engineering vehicles, and the elastic skirt 43 and the one-way diaphragm 431 in the diverter bellows 4 play an important role. When the pressure in the side wind bin 401 is reduced due to the operation of the blast blades 54, external air can be replenished through the one-way diaphragm 431, which prevents dust from entering the side wind bin 401 to a certain extent, reducing the accumulation of dust inside the bellows. At the same time, the pre-filtration and post-filtration of air by the first filter element 12 and the second filter element 22 greatly reduce the risk of dust erosion and clogging of the core components of the evaporator, effectively extending the maintenance cycle of the evaporator and reducing maintenance costs.

[0085] At the same time, the cleaning system 6 of the present invention can realize automatic cleaning of the first filter element 12 and the second filter element 22 through the coordinated work of the electromagnet 511, the transmission seat 521, the negative pressure seat 62 and other components. When cleaning is needed, it is only necessary to control the electromagnet 511 to be energized to start the cleaning program. During the cleaning process, the negative pressure generated by the negative pressure blade 621 sucks in impurities near the filter element, and then according to the airflow control function of the duct 61 at different positions, the impurity discharge and the strong blowing of the filter element can be realized respectively. The cleaning system 6 can remove large particles of impurities attached to the surface of the filter element, effectively extending the service life of the filter element, reducing the frequency of manual cleaning, reducing the maintenance workload and cost, and improving the convenience and economy of the use of engineering vehicles.

[0086] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A combined pre-cooling evaporator, comprising an air inlet pipe (1) with an auxiliary evaporator (11) and an air outlet pipe (2) with a main evaporator (21), characterized in that: The output end of the air inlet pipe (1) is connected to a connecting elbow (3), the input end of the air outlet pipe (2) is connected to a diverter bellows (4), the output end of the connecting elbow (3) is connected to the input end of the diverter bellows (4), and the diverter bellows (4) contains an air supply system (5) for drawing air from the air inlet pipe (1) into the air outlet pipe (2); The air supply system (5) comprises a driving motor (52) and a blast blade (54); the outer side of the driving motor (52) is also sleeved with a wind shield (51); The split air box (4) comprises a bellows shell (41), wherein two groups of split air plates (42) are symmetrically arranged in the bellows shell (41), the two groups of split air plates (42) are symmetrically rotatably connected to the inner side of the bellows shell (41), the ends of the split air plates (42) are elastically connected to elastic skirt plates (43), the split air plates (42) divide the bellows shell (41) into a side wind bin (401) and a main wind bin (402), the bellows shell (41) is symmetrically provided with two groups of side air ports (411) at the top of the side wind bin (401), and the side air ports (411) are connected to the wind cover (51) via an air guide pipe (53); The two groups of split air plates (42) are used to split the output air of the blast blades (54) into the air hood (51); The air inlet pipe (1) is fixed with a first filter element (12) on the air inlet side of the auxiliary evaporator (11), and the air outlet pipe (2) is fixed with a second filter element (22) on the air inlet side of the main evaporator (21); The top of the blast blade (54) is rotatably connected to the inside of the bellows housing (41); a cleaning system (6) for cleaning impurities attached to the first filter element (12) and the second filter element (22) is also provided inside the blast blade (54); and a first driven gear (541) is also provided at the top of the blast blade (54); The cleaning system (6) comprises a conduit (61), a negative pressure seat (62) and a discharge seat (63); a spline shaft (522) is fixed to the output end of the drive motor (52); an electromagnet (511) is fixed to the bottom of the wind cover (51); the output end of the drive motor (52) is slidably connected to a transmission seat (521) in a vertical direction; a spline groove matching the spline shaft (522) is provided on the top of the transmission seat (521); a drive gear (5212) and a first magnetic ring (523) are fixed to the outer wall of the transmission seat (521); the drive gear (5212) is meshed with a first driven gear (541); and a plurality of air ducts (5211) evenly spaced at equal angles are provided on the inner wall of the transmission seat (521); The negative pressure seat (62) is integrally rotatably connected to the inner wall of the blast blade (54); a negative pressure blade (621) is provided in the negative pressure seat (62); a conical cover (623) is fixed to the top of the negative pressure blade (621); a shearing tooth (624) is provided on the top of the conical cover (623); the top of the conical cover (623) is slidably connected to the bottom of the transmission seat (521); and the wind cover (51) is connected to the conical cover (623) via an air duct (5211); A return spring (625) is clamped between the transmission seat (521) and the negative pressure seat (62), and the return spring (625) has an elastic force to drive the transmission seat (521) to move upward. A second driven gear (622) that matches the driving gear (5212) is also provided on the top of the negative pressure seat (62); The conduit (61) is used to guide the airflow output by the negative pressure blade (621) to the outside, the discharge seat (63) is fixed on the connecting elbow (3), the conduit (61) is slidably connected between the negative pressure seat (62) and the discharge seat (63), a second magnetic ring (612) is fixed on the top of the conduit (61), a plurality of pressurized inner holes (611) arranged evenly at equal angles are provided in the middle of the conduit (61), a pressurized outer hole (631) matched with the pressurized inner hole (611) is provided on the discharge seat (63), a plurality of discharge top holes (614) arranged evenly at equal angles are provided on the bottom of the conduit (61), and a bottom plate (64) is rotatably connected to the bottom of the conduit (61), and a discharge bottom hole (641) matched with the discharge top hole (614) is provided on the bottom plate (64); The bottom of the discharge seat (63) extends to the outside of the connecting elbow (3) and is provided with a discharge port (634) that matches the discharge top hole (614); The sliding distance of the conduit (61) between the negative pressure seat (62) and the discharge seat (63) has three sections. When the conduit (61) is located at a high section height, the pressurized inner hole (611) and the pressurized outer hole (631) are alternately closed, and the discharge top hole (614) and the discharge bottom hole (641) are overlapped and opened. When the conduit (61) is located at a middle section height, the pressurized inner hole (611) and the pressurized outer hole (631) are alternately closed, and the discharge top hole (614) and the discharge bottom hole (641) are overlapped and opened. When the conduit (61) is located at a low section height, the pressurized inner hole (611) and the pressurized outer hole (631) are overlapped and opened, and the discharge top hole (614) and the discharge bottom hole (641) are alternately closed.

2. A combined pre-cooling evaporator according to claim 1, characterized in that: The air splitter plate (42) comprises a semicircular portion and an arcuate portion, the semicircular portion of the air splitter plate (42) is provided with two sets of guide sliders (422), the bellows housing (41) is provided with an arcuate slide groove (412) matching the guide sliders (422), and a matching spring (413) is further provided between the arcuate slide groove (412) and the guide sliders (422); The opposing spring (413) has an elastic force that drives the two groups of diverter air plates (42) to move closer together.

3. A combined pre-cooling evaporator according to claim 2, characterized in that: The bellows housing (41) is provided with a circular outer wall corresponding to the semicircular portion of the split air plate (42); an air groove (403) is provided between the circular outer wall of the bellows housing (41) and the semicircular portion of the split air plate (42); a fixed wind shield (414) is fixed in the wind groove (403); and movable wind shields (423) are fixed on opposite sides of the semicircular portions of the two groups of split air plates (42).

4. A combined pre-cooling evaporator according to claim 3, characterized in that: The arc-shaped portions of the split air plates (42) are each fixed with a sealing plate (421) matching the side air outlets (411); The elastic skirt plate (43) is elastically connected to the end of the split air plate (42) via a rubber connector, and the rubber connector has an elastic force that drives the elastic skirt plate (43) to approach the split air plate (42); A plurality of one-way diaphragms (431) are also provided on the elastic skirt plate (43), and the one-way diaphragms (431) have a one-way conductivity for allowing external air to be introduced into the side air bin (401) in a one-way manner.

5. The combined pre-cooling evaporator according to claim 1, characterized in that: A tension spring (65) is clamped between the bottom plate (64) and the discharge seat (63), and the tension spring (65) has an elastic force that drives the guide tube (61) to move upward and away from the discharge seat (63).

6. A combined pre-cooling evaporator according to claim 5, characterized in that: The inner wall of the discharge seat (63) is provided with a plurality of limit grooves (633) evenly spaced at equal angles, a limit sliding block (642) matched with the limit grooves (633) is fixed on the bottom plate (64), the inner wall of the discharge seat (63) is further provided with a plurality of spiral grooves (632) evenly spaced at equal angles at the top of the limit grooves (633), and the outer wall of the conduit (61) is provided with a ball (613) matched with the spiral grooves (632).

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