New energy vehicle refrigeration and freezing unit

Abstract

The utility model relates to the technical field of refrigeration and freezing unit, provide a new energy vehicle refrigeration and freezing unit, including installation machine cover, the rear side of installation machine cover is connected with installation connecting frame, the front side of installation machine cover is equipped with air outlet, be equipped with refrigeration unit between installation machine cover and installation connecting frame, and the refrigeration unit includes evaporimeter and refrigerating ware, and the rear side of evaporimeter is equipped with blowing unit, blowing unit includes the fixed frame, the inside mounting of fixed frame has the fan, the side of fan is provided with first drive unit, and the transmission shaft on fan installs the second drive unit corresponding with first drive unit, and the transmission between first drive unit and second drive unit is driven by transmission belt, the utility model discloses through the synergies of first drive unit and second drive unit, realizes the stepless regulation of fan rotating speed, when the temperature difference in refrigeration box is bigger, can fast promotion rotating speed to enhance refrigeration efficiency, when temperature tends to be stable, automatically reduce rotating speed and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration and freezing units, and in particular to a refrigeration and freezing unit for new energy vehicles. Background Technology

[0002] With the continuous development of new energy vehicles, their application areas are also expanding, among which cold chain transportation is one of the important application directions. In the cold chain transportation process of new energy vehicles, refrigeration and freezing units are key equipment to ensure the quality of goods, and their performance directly affects the preservation effect and transportation quality of goods.

[0003] In existing refrigeration and freezing units for new energy vehicles, traditional units mostly use fixed-frequency fans with a fixed speed of 3000-3500 r / min, which cannot match the dynamic temperature changes inside the refrigerated compartment. When loading perishable goods (such as fresh meat), the initial cooling stage requires strong air circulation to quickly create a temperature difference (usually from ambient temperature of 25℃ to -18℃), but the fixed airflow of the fixed-frequency fan results in a cooling time of 60-90 minutes, which is 40% longer than ideal. The above is true; however, once the internal temperature stabilizes, continuous high-speed operation will cause excessive loss of cooling capacity. Actual test data shows that the energy consumption per unit mileage is 25-30% higher than that of the frequency conversion adjustment solution. Although some modified models have attempted to use frequency conversion motors to adjust the fan speed, traditional gearbox or belt drive structures have inherent defects: the vibration noise generated by the rigid contact of gear transmission reaches 75-80dB, far exceeding the NVH (noise, vibration and harshness) design standard of new energy vehicles (≤65dB); belt transmission is prone to loosening and slippage due to high temperature environment (engine compartment temperature can reach 60-70℃), resulting in speed fluctuation error and inability to guarantee the uniformity of cold air circulation. Utility Model Content

[0004] The purpose of this invention is to provide a refrigeration and freezing unit for new energy vehicles. Through the cooperation between the first transmission unit and the second transmission unit, stepless speed regulation of the fan can be achieved to ensure a constant temperature inside the refrigerator compartment of the vehicle.

[0005] The present invention adopts the following technical solution: a refrigeration and freezing unit for new energy vehicles, including a mounting cover installed in the vehicle's refrigeration box, a mounting bracket connected to the rear side of the mounting cover, an air outlet opened on the front side of the mounting cover, a refrigeration unit arranged between the mounting cover and the mounting bracket, the refrigeration unit including an evaporator and a refrigeration unit, the evaporator being installed inside the mounting cover and corresponding to the air outlet, and a blower unit installed inside the mounting cover being arranged on the rear side of the evaporator;

[0006] The blowing unit includes a fixed frame disposed inside the mounting cover, a fan is installed inside the fixed frame, a first transmission unit is disposed on one side of the fan and located inside the mounting cover, and a second transmission unit corresponding to the first transmission unit is installed on the transmission shaft of the fan, the first transmission unit and the second transmission unit are connected by a transmission belt, the first transmission unit drives the second transmission unit to rotate the fan through the transmission belt and at the same time realizes the control of the fan speed.

[0007] Preferably, the first transmission unit includes two first rings and two second rings, with the two second rings located between the two first rings. The first rings have a plurality of first grooves arranged in a ring array, and the second rings have a plurality of second grooves arranged in a ring array. The first grooves and second grooves are arranged intersectingly, and a support shaft is arranged between the intersection of the first grooves and the second grooves. A transmission roller is connected to the support shaft, and the transmission belt is in contact with the transmission roller.

[0008] Preferably, both the first and second slides are arc-shaped, with the arc direction of the first slide being opposite to that of the second slide.

[0009] Preferably, a connecting plate is fixedly connected between the two first rings. The connecting plate is arc-shaped to ensure that the two first rings are fixed together. The diameter of the first ring is larger than the diameter of the second ring.

[0010] Preferably, an adjusting rod is rotatably disposed at the center between the two first rings and the two second rings. The adjusting rod has a threaded groove on its outer periphery, and two threaded grooves are symmetrically arranged. The interior of the second ring has a protrusion corresponding to the threaded groove. The second transmission unit has the same structure as the first transmission unit.

[0011] Preferably, the transmission roller is a toothed roller, and the transmission belt is a micro-toothed chain.

[0012] Preferably, the first transmission unit further includes a driver and a telescopic device. The driver is located at the rear of the first transmission unit and is connected to the first ring via an output shaft. The telescopic device is located at the front of the first transmission unit and is rotatably connected to the adjusting rod. A fixed seat is provided on one side of the fixed frame, and the telescopic device is mounted on the fixed seat.

[0013] Preferably, there are two blower units, two first transmission units and two second transmission units, with each of the two second transmission units corresponding to one of the two blower units. The two first transmission units are arranged one in front of the other, and the four first rings on the two first transmission units are connected together by a connecting plate.

[0014] Preferably, the second transmission unit further includes a mounting sleeve, a slide rail is provided at one end of the transmission shaft near the first transmission unit, the two ends of the adjusting rod correspond to the slide rail and the mounting sleeve respectively, a first elastic element is provided between the adjusting rod and the slide rail, and the connecting plate in the second transmission unit is semi-circular and located on one side of the second transmission unit.

[0015] Preferably, the adjusting rod has four threaded grooves, and the protrusions on the four second rings of the two first transmission units correspond one-to-one with the four threaded grooves; one first transmission unit and one second transmission unit are combined to form a set of drive units for driving the fan to rotate, and the two sets of drive units are staggered.

[0016] The beneficial effects of this utility model are:

[0017] 1. Through the coordinated action of the first and second transmission units, stepless adjustment of the fan speed is achieved; when the temperature difference inside the refrigerator is large, the speed can be quickly increased to enhance the cooling efficiency; when the temperature tends to stabilize, the speed is automatically reduced to reduce energy consumption. Compared with traditional fixed-speed fans, the energy utilization rate is increased by more than 30%, which meets the energy-saving requirements of new energy vehicles.

[0018] 2. The second ring is driven to move by the threaded transmission principle of the adjusting rod, and the position of the transmission roller is changed by the guide of the slide groove to achieve precise control of the transmission ratio. The entire adjustment process is electrically driven by the telescopic device, without manual intervention, and can be linked with the temperature control system of the refrigerator to achieve fully automatic adjustment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the refrigeration unit of this utility model;

[0020] Figure 2 This is a rear view structural diagram of the refrigeration unit of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the blower unit of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the first transmission unit of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the transmission roller of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the adjusting rod of this utility model;

[0025] Figure 7 This is a cross-sectional structural diagram of the second transmission unit of this utility model.

[0026] In the picture:

[0027] 1. Mounting cover; 2. Mounting bracket; 3. Evaporator; 4. Blowing unit; 5. First transmission unit; 6. Second transmission unit; 7. Transmission belt; 8. Driver; 9. Telescopic device; 10. Adjusting rod; 101. Threaded groove; 11. Air outlet; 41. Fixing bracket; 42. Fan; 421. Drive shaft; 422. Slide rail; 423. First elastic element; 51. First ring; 52. Second ring; 53. Support shaft; 54. Transmission roller; 55. Connecting plate; 511. First slide groove; 521. Second slide groove; 522. Protrusion; 61. Mounting sleeve. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0029] like Figures 1 to 7 As shown, this utility model provides a refrigeration and freezing unit for new energy vehicles, including a mounting cover 1 installed inside the vehicle's refrigerator compartment. A mounting bracket 2 is connected to the rear side of the mounting cover 1, and an air outlet 11 is provided on the front side of the mounting cover 1. A filter screen is installed at the air outlet 11. A refrigeration unit is provided between the mounting cover 1 and the mounting bracket 2. The refrigeration unit includes an evaporator 3 and a refrigerator. The refrigerator is existing technology and will not be described in detail here. The evaporator 3 is installed inside the mounting cover 1 and corresponds to the air outlet 11. A blower unit 4 is provided on the rear side of the evaporator 3 and installed inside the mounting cover 1. The blower unit 4 blows the cold air on the evaporator 3 into the vehicle's refrigerator compartment to ensure a constant temperature inside the refrigerator compartment.

[0030] In order to cool the inside of the refrigerator, in this embodiment, the blowing unit 4 includes a fixed frame 41 disposed inside the mounting cover 1. A fan 42 is installed inside the fixed frame 41. A first transmission unit 5 located inside the mounting cover 1 is disposed on one side of the fan 42. A second transmission unit 6 corresponding to the first transmission unit 5 is installed on the transmission shaft 421 of the fan 42. The first transmission unit 5 and the second transmission unit 6 are connected by a transmission belt 7. The first transmission unit 5 drives the second transmission unit 6 to rotate the fan 42 through the transmission belt 7, thereby controlling the speed of the fan 42.

[0031] To achieve stepless frequency conversion adjustment of the fan speed 42, in this embodiment, the first transmission unit 5 includes two first rings 51 and two second rings 52. The two second rings 52 are located between the two first rings 51. The first rings 51 are provided with a plurality of first grooves 511 arranged in a ring array, and the second rings 52 are provided with a plurality of second grooves 521 arranged in a ring array. The plurality of second grooves 521 correspond one-to-one with the plurality of first grooves 511. Both the first grooves 511 and the second grooves 521 are arranged in an arc shape. The arc direction of the first groove 511 is opposite to the arc direction of the second groove 521. The first grooves 511 and the second grooves 521 are arranged to cross each other. A support shaft 53 is provided between the intersection of the first grooves 511 and the second grooves 521. A transmission roller 54 is connected to the support shaft 53. The transmission belt 7 is in contact with the transmission roller 54. The two ends of the support shaft 53 are not cylindrical to prevent the transmission roller 54 from rotating during rotation.

[0032] In another embodiment, both the first slide 511 and the second slide 521 are inclined, and the inclination direction of the first slide 511 is opposite to that of the second slide 521.

[0033] To ensure the fixation between the two first rings 51, in this embodiment, a connecting plate 55 is fixedly connected between the two first rings 51. The connecting plate 55 is arc-shaped, and the diameter of the first ring 51 is larger than the diameter of the second ring 52, so as to prevent the transmission belt 7 from contacting the connecting plate 55 when it is at its maximum diameter on the first transmission unit 5 or the second transmission unit 6.

[0034] In order to adjust the revolution diameter of the transmission roller 54, in this embodiment, an adjusting rod 10 is rotatably arranged between the two first rings 51 and the two second rings 52. The outer periphery of the adjusting rod 10 is provided with a threaded groove 101, and two threaded grooves 101 are symmetrically arranged. The interior of the second ring 52 is provided with a protrusion 522 corresponding to the threaded groove 101. The second transmission unit 6 has the same structure as the first transmission unit 5. The transmission roller 54 is a toothed roller, and the transmission belt 7 is a micro-toothed chain, which can increase the stability of the transmission between the transmission belt 7 and the transmission roller 54 and avoid slippage. At the same time, it can also ensure that the revolution diameter of the transmission roller 54 in the second transmission unit 6 changes with the revolution diameter of the transmission roller 54 in the first transmission unit 5.

[0035] In the above scheme, when the temperature inside the refrigerator rises or falls, the control system triggers the telescopic device 9 to move. The telescopic rod of the telescopic device 9 extends or shortens, driving the adjusting rod 10 to move back and forth. By utilizing the cooperation between the protrusion 522 inside the second ring 52 and the threaded groove 101 of the adjusting rod 10, the back and forth movement of the adjusting rod 10 is converted into the rotational movement of the second ring 52 along the axial direction. During the rotation of the second ring 52, the second sliding groove 521 on its surface pushes the support shaft 53 to slide in the first sliding groove 511 of the first ring 51, so that the support shaft 53 moves towards the outside of the first sliding groove 511. That is, the sliding of the support shaft 53 changes the revolution radius of the transmission roller 54.

[0036] The first transmission unit 5 also includes a driver 8 and a telescopic device 9. The driver 8 is located at the rear of the first transmission unit 5 and is connected to the first ring 51 through an output shaft. The driver 8 is a motor. The telescopic device 9 is located at the front of the first transmission unit 5 and is rotatably connected to the adjusting rod 10. The telescopic device 9 is an electric telescopic rod. A fixed seat is provided on one side of the fixed frame 41. The telescopic device 9 is installed on the fixed seat to limit the position of the telescopic device 9. A temperature sensor is installed inside the refrigerator. When the temperature inside the refrigerator is lower than the preset temperature, the temperature sensor drives the telescopic device 9 to work through the controller.

[0037] The second transmission unit 6 also includes a mounting sleeve 61. A slide 422 is provided at one end of the transmission shaft 421 near the first transmission unit 5. The two ends of the adjusting rod 10 correspond to the slide 422 and the mounting sleeve 61, respectively. A first elastic element 423 is provided between the adjusting rod 10 and the slide 422. The elastic element is a spring. The connecting plate 55 in the second transmission unit 6 is semi-circular and located on one side of the second transmission unit 6.

[0038] In the above scheme, in the initial state, the first elastic element 423 makes the rotation radius of the transmission roller 54 of the second transmission unit 6 at its maximum. Since the length of the transmission belt 7 is fixed, after the rotation radius of the transmission roller 54 in the first transmission unit 5 changes, the rotation radius of the transmission roller 54 of the second transmission unit 6 is changed through the transmission belt 7.

[0039] When the transmission roller 54 in the first transmission unit 5 is close to the center of the first transmission unit 5, the revolution diameter of the transmission roller 54 in the first transmission unit 5 decreases, and the revolution diameter of the transmission roller 54 in the second transmission unit 6 increases under the action of the first elastic element 423. The transmission ratio between the first transmission unit 5 and the second transmission unit 6 decreases, and the speed of the fan 42 decreases. When the transmission roller 54 in the first transmission unit 5 is far from the center, the revolution diameter of the transmission roller 54 in the first transmission unit 5 increases. The first transmission unit 5 forces the revolution diameter of the transmission roller 54 in the second transmission unit 6 to decrease through the transmission belt 7. The transmission roller 54 in the second transmission unit 6 causes the second ring 52 to rotate through the support shaft 53, driving the adjusting rod 10 to move back and forth, compressing the first elastic element 423, thereby increasing the transmission ratio between the first transmission unit 5 and the second transmission unit 6, and increasing the speed of the fan 42.

[0040] There are two blower units 4, and two first transmission units 5 and two second transmission units 6. The two second transmission units 6 correspond one-to-one with the two blower units 4. The two first transmission units 5 are arranged one after the other. The four first rings 51 on the two first transmission units 5 are connected together by a connecting plate 55. The adjusting rod 10 has four threaded grooves 101. The protrusions 522 on the four second rings 52 in the two first transmission units 5 correspond one-to-one with the four threaded grooves 101. One first transmission unit 5 and one second transmission unit 6 are combined to form a set of drive units for driving the fan 42 to rotate. The two sets of drive units are arranged alternately.

[0041] In the above scheme, due to the length of the evaporator 3 inside the mounting shroud 1, at least two fans 42 are installed inside the mounting shroud 1. When the adjusting rod 10 moves back and forth, it drives the transmission rollers 54 in the two first transmission units 5 to change their revolution diameter, and drives the transmission rollers 54 in the two second transmission units 6 to change, so that the rotation speed of the two fans 42 can be changed by using one drive source.

[0042] The independent operation mode of the dual drive units forms a redundant structure that backs up each other. When one set of units fails, the other set can immediately take over the work to ensure that the temperature inside the refrigerated box does not exceed the safe threshold (fluctuation range ≤2℃), avoid damage to goods due to equipment failure, and improve the reliability of cold chain transportation.

[0043] Working principle:

[0044] In terms of the refrigeration cycle, in order to ensure a constant temperature inside the refrigerator, the cooling energy generated by the refrigeration unit is transferred to the evaporator 3, which lowers the surface temperature of the evaporator 3. At this time, the driver 8 starts, and its output shaft drives the first ring 51 in the first transmission unit 5 to rotate. Since the first ring 51 and the second ring 52 are connected by the support shaft 53 and the transmission roller 54, the rotational force of the first ring 51 is transmitted to the second transmission unit 6 through the transmission roller 54, which in turn drives the transmission shaft 421 of the fan 42 to rotate, causing the fan blades to rotate at high speed and generate airflow. When the airflow passes through the evaporator 3, it carries cold air and is finally sent into the refrigerator through the air outlet 11 to maintain the low temperature environment inside the refrigerator.

[0045] In the fan speed adjustment mechanism, when the temperature sensor inside the refrigerator detects a deviation between the actual temperature and the set value, the control system triggers the telescopic device 9 to move. The telescopic rod of the telescopic device 9 extends or shortens, causing the adjusting rod 10 to move back and forth. Since the protrusion 522 inside the second ring 52 is embedded in the threaded groove 101 of the adjusting rod 10, the back and forth movement of the adjusting rod 10 will be converted into the rotational movement of the second ring 52 along the axial direction.

[0046] During the rotation of the second ring 52, the second groove 521 on its surface pushes the support shaft 53 to slide within the first groove 511 of the first ring 51. Since the arc directions of the first groove 511 and the second groove 521 are opposite, the sliding of the support shaft 53 causes the revolution radius of the transmission roller 54 to change. When the transmission roller 54 is close to the center of the first transmission unit 5, the transmission ratio between the first transmission unit 5 and the second transmission unit 6 decreases, and the speed of the fan 42 decreases. When the transmission roller 54 is far from the center, the transmission ratio increases, and the speed of the fan 42 increases.

[0047] During this process, the first elastic element 423 in the second transmission unit 6 always applies a preload to the adjusting rod 10, ensuring that the radius of rotation of the transmission roller 54 in the first transmission unit 5 changes, thereby causing the radius of rotation of the transmission roller 54 in the second transmission unit 6 to change, so as to realize the stepless speed regulation of the fan 42. The wind speed of the fan 42 can be changed according to the internal temperature of the refrigerator.

[0048] 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A refrigeration and freezing unit for new energy vehicles, comprising a mounting cover (1) installed inside the vehicle's refrigerated compartment, wherein a mounting bracket (2) is connected to the rear side of the mounting cover (1), and an air outlet (11) is provided on the front side of the mounting cover (1), characterized in that, A refrigeration unit is provided between the mounting cover (1) and the mounting bracket (2). The refrigeration unit includes an evaporator (3) and a refrigerator. The evaporator (3) is installed inside the mounting cover (1) and corresponds to the air outlet (11). A blower unit (4) is installed inside the mounting cover (1) on the rear side of the evaporator (3). The blowing unit (4) includes a fixed frame (41) disposed inside the mounting cover (1). A fan (42) is installed inside the fixed frame (41). A first transmission unit (5) is disposed on one side of the fan (42) inside the mounting cover (1). A second transmission unit (6) corresponding to the first transmission unit (5) is installed on the transmission shaft (421) of the fan (42). The first transmission unit (5) and the second transmission unit (6) are connected by a transmission belt (7). The first transmission unit (5) drives the second transmission unit (6) to rotate the fan (42) through the transmission belt (7) while simultaneously regulating the speed of the fan (42).

2. The refrigeration and freezing unit for new energy vehicles according to claim 1, characterized in that: The first transmission unit (5) includes two first rings (51) and two second rings (52). The two second rings (52) are located between the two first rings (51). The first rings (51) are provided with a plurality of first grooves (511) in an annular array. The second rings (52) are provided with a plurality of second grooves (521) in an annular array. The first grooves (511) and the second grooves (521) are arranged to cross each other. A support shaft (53) is provided between the intersection of the first grooves (511) and the second grooves (521). A transmission roller (54) is connected to the support shaft (53). The transmission belt (7) is in contact with the transmission roller (54).

3. The refrigeration and freezing unit for new energy vehicles according to claim 2, characterized in that: The first slide (511) and the second slide (521) are both arc-shaped, and the arc direction of the first slide (511) is opposite to that of the second slide (521).

4. The refrigeration and freezing unit for new energy vehicles according to claim 3, characterized in that: A connecting plate (55) is fixedly connected between the two first rings (51). The connecting plate (55) is arc-shaped to ensure that the two first rings (51) are fixed together. The diameter of the first ring (51) is larger than the diameter of the second ring (52).

5. The refrigeration and freezing unit for new energy vehicles according to claim 4, characterized in that: An adjusting rod (10) is rotatably arranged between the two first rings (51) and the two second rings (52). The adjusting rod (10) has a threaded groove (101) on its outer periphery. Two threaded grooves (101) are symmetrically arranged. The second ring (52) has a protrusion (522) corresponding to the threaded groove (101) inside. The second transmission unit (6) has the same structure as the first transmission unit (5).

6. The refrigeration and freezing unit for new energy vehicles according to claim 5, characterized in that: The transmission roller (54) is a toothed roller, and the transmission belt (7) is a micro-toothed chain.

7. The refrigeration and freezing unit for new energy vehicles according to claim 6, characterized in that: The first transmission unit (5) further includes a driver (8) and a telescopic device (9). The driver (8) is located on the rear side of the first transmission unit (5) and is connected to the first ring (51) through an output shaft. The telescopic device (9) is located on the front side of the first transmission unit (5) and is rotatably connected to the adjusting rod (10). A fixed seat is provided on one side of the fixed frame (41), and the telescopic device (9) is installed on the fixed seat.

8. The refrigeration and freezing unit for new energy vehicles according to claim 7, characterized in that: The second transmission unit (6) also includes a mounting sleeve (61). The transmission shaft (421) has a slide (422) at one end near the first transmission unit (5). The two ends of the adjusting rod (10) correspond to the slide (422) and the mounting sleeve (61) respectively. A first elastic element (423) is provided between the adjusting rod (10) and the slide (422). The connecting plate (55) in the second transmission unit (6) is semi-circular and located on one side of the second transmission unit (6).

9. The refrigeration and freezing unit for new energy vehicles according to claim 8, characterized in that: There are two blower units (4), two first transmission units (5) and two second transmission units (6). The two second transmission units (6) correspond one-to-one with the two blower units (4). The two first transmission units (5) are arranged one after the other. The four first rings (51) on the two first transmission units (5) are connected together by a connecting plate (55).

10. The refrigeration and freezing unit for new energy vehicles according to claim 9, characterized in that: The adjusting rod (10) has four threaded grooves (101), and the protrusions (522) on the four second rings (52) of the two first transmission units (5) correspond one-to-one with the four threaded grooves (101); a first transmission unit (5) and a second transmission unit (6) are combined to form a set of drive units for driving the fan (42) to rotate, and the two sets of drive units are staggered.

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