CN111846053A - Bicycle Refrigeration Device Based on Diameter Ratio of Wheel and Friction Wheel - Google Patents

Abstract

The invention provides a bicycle refrigerating device based on variable speed transmission of a wheel-friction wheel diameter ratio, and belongs to the technical field of application of friction wheels and Stirling refrigerators. The device includes the friction pulley, the stirling refrigerator, fridge and control switch, the friction pulley is connected to the bicycle tire, the friction pulley passes through the rotor and connects the stirling refrigerator, the fridge is connected to the stirling refrigerator, control switch installation and handlebar are last, through the metal wire, control lever connects the stirling refrigerator, the device utilizes mechanical energy to produce cold volume, in view of humanized design, it makes friction pulley and rear wheel laminating refrigeration to compress tightly switch through controlling means at the speed reduction in-process of riding, also can reach the effect of slowing down, can remove the laminating between the two when going up a slope, reduce human load. The invention can be used for refrigerating beverage and cooling food when playing in the field, is light and simple, and has high efficiency and energy saving.

Description

Bicycle Refrigeration Device Based on Diameter Ratio of Wheel and Friction Wheel

technical field

The invention relates to the application technical field of friction wheels and Stirling refrigerators, in particular to a bicycle refrigeration device with variable-speed transmission based on the diameter ratio of wheels and friction wheels.

Background technique

With the improvement of people's living standards, more and more people pay attention to the quality of life. Because the bicycle is a healthy, environmentally friendly, convenient and easy-to-learn means of transportation, it has become a standing option for people's short-distance travel. Especially in recent years, the concept of green travel has been deeply rooted in the hearts of the people, and as the new crown epidemic tends to ease, the "resumption of work" curtain is gradually opened, and people will also prefer bicycles with good ventilation in commuting tools. However, the simple mechanical structure of bicycles is not enough to meet people's other needs. People often hope to ride to sparsely populated places to cook a meal, eat barbecue, drink iced drinks and enjoy the beautiful scenery around them. Cycling takes a long time after a long journey, and the hot weather can also cause stale food and cold drinks to reheat. Conventional power supplies and refrigerators are obviously not easy to carry. If the power supply runs out, the operation of the refrigerator will also stop, which will bring great inconvenience. At the same time, bicycles often use the brakes intermittently to adjust the speed during riding. In the previous bicycle braking system, all the kinetic energy of the bicycle will be converted into heat energy, and this energy is wasted in the air. be properly applied. If the originally wasted mechanical energy can be directly refrigerated, not only can the mechanical energy be fully utilized, but also the functions of the bicycle can be diversified, which brings great convenience to people when traveling. Based on the above considerations, the team has designed a device that can use the friction wheel to drive the refrigerator to cool, which not only realizes the recovery of energy that could not be used when braking, but also reflects the concept of green environmental protection. provides a new idea.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to propose a bicycle refrigeration device based on the variable-speed transmission of the diameter ratio of the wheel and the friction wheel.

The device includes a friction wheel, a Stirling refrigerator, a refrigerator and a control system, wherein the Stirling refrigerator includes a regenerator, a refrigeration cylinder, a cooling cylinder, a compression piston and an expansion piston, and a central rotating shaft, and the refrigerator includes an insulation layer , Aluminum inner tank and aluminum fins, control system includes control lever, control switch, metal wire and spring device, bicycle tire is connected with friction wheel, friction wheel is connected with Stirling refrigerator through rotor, Stirling refrigeration The cold end of the machine is connected to the refrigerator box, the regenerator is connected to the refrigeration cylinder and the cooling cylinder, the compression piston and the expansion piston are respectively connected to two flywheels through connecting rods, and the two flywheels are connected to the central shaft. The rotation of the central shaft drives the compression piston and expansion. The piston completes the circulation process in the cooling cylinder and the refrigeration cylinder. The control switch is located at the handlebar. The control switch is connected to the control lever through a metal wire. One end of the control lever is connected to the friction wheel, and the other end is pulled by the metal wire. The friction wheel and the tire are controlled by a spring device. The outside of the refrigerator is an insulating layer, the inside of the insulating layer is an aluminum liner, and the side walls of the refrigerator are provided with aluminum ribs.

The bicycle provides the mechanical energy for the Stirling refrigerator. The ratio of the diameter of the bicycle wheel and the friction wheel to the variable speed transmission converts the low speed of the bicycle wheel into the high speed required by the rotor of the refrigerator. It is 2000～4000r/min.

The diameter of the friction wheel is 2.5cm, and the surface of the friction wheel is made of rubber material.

The thermal insulation layer is composed of foamed rigid polyurethane foam and foam board with an apparent density of 20 to 23kg/ ^m3 . When the density of the foamed rigid polyurethane foam is 35 to 40kg/ ^m3 , the thermal conductivity is 0.018 to 0.024W. /(m·k).

The compression piston and the expansion piston complete the cycle process in the refrigeration cylinder and the cooling cylinder, and each cycle process includes four processes of isothermal compression, isovolumetric heat release, isothermal expansion, and isovolumetric heat absorption.

The inside of the regenerator is filled with stacked wire mesh, which is a porous medium, which is formed by first forming and then stacking wire mesh sheets.

The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:

In the above scheme, through the mechanical transformation of the bicycle, combined with design technologies such as friction wheel contact transmission, Stirling refrigeration, and fin enhanced heat exchange, the recycling of mechanical energy is realized. The device makes vertical contact between the edge of the rear tire of the bicycle and the friction wheel, and drives the rotor of the refrigerator to generate a high speed, so that part of the mechanical energy originally wasted during braking and riding can be directly used for cooling, which not only saves energy consumption, but also facilitates use. At the same time, the input power of the refrigerator is low, and the load on people is not high after shifting through the friction wheel, and the device can realize continuous riding operation. Stirling refrigerators are the most in-depth and most modified small cryogenic refrigerators currently studied. They are widely used and mature in technology. The whole device is small in size, light in weight, compact and beautiful in structure. It effectively solves the problems of inconvenience of taking out food in summer and low energy utilization efficiency when riding. The device has the advantages of lightness and portability, the cooling capacity can be used with the production, the energy conversion efficiency is high, and the device is integrated. At the same time, when the Stirling machine is working, the rotor rotates forward for cooling and reverse rotation to generate heat. The device realizes the efficient utilization of the mechanical energy of the bicycle when riding, and its design idea conforms to the national concept of energy conservation, emission reduction and sustainable development, and has broad application prospects and good economic benefits.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the device of the present invention;

Fig. 2 is the structural representation of the double-piston Stirling refrigerator driven by the crank connecting rod mechanism in the present invention;

FIG. 3 is a schematic structural diagram of the interior of the incubator of the present invention.

Among them: 1- Bicycle, 2- Friction Wheel, 3- Stirling Refrigerator, 4- Refrigerator, 5- Control Lever, 6- Control Switch, 7- Metal Wire, 8- Spring Device, 9- Regenerator, 10-refrigeration cylinder, 11-cooling cylinder, 12-compression piston, 13-expansion piston, 14-central shaft, 15-insulation layer, 16-aluminum inner tank, 17-aluminum fins.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a bicycle refrigeration device with variable speed transmission based on the diameter ratio of wheels and friction wheels.

As shown in FIG. 1 , the device includes a friction wheel 2 , a Stirling refrigerator 3 , a refrigerator 4 and a control system, wherein, as shown in FIG. 2 , the Stirling refrigerator 3 includes a regenerator 9 and a refrigeration cylinder 10 , cooling cylinder 11, compression piston 12 and expansion piston 13, central shaft 14, as shown in Figure 3, the refrigerator 4 includes a thermal insulation layer 15, an aluminum inner tank 16 and aluminum fins 17, and the control system includes a control lever 5, The control switch 6, the metal wire 7 and the spring device 8, the tire of the bicycle 1 is connected with the friction wheel 2, the friction wheel 2 is connected with the Stirling refrigerator 3 through the rotor, and the cold end of the Stirling refrigerator 3 is connected with the refrigerator 4, and the return Heater 9 is connected to refrigeration cylinder 10 and cooling cylinder 11, compression piston 12 and expansion piston 13 are respectively connected to two flywheels, and the two flywheels are connected to central shaft 14, and the rotation of central shaft 14 drives compression piston 12 and expansion piston 13 to rotate. The circulation process is completed in the cooling cylinder 11 and the refrigeration cylinder 10. The control switch 6 is located at the handlebar, and the control switch 6 is connected with the control lever 5 through the metal wire 7. One end of the control lever 5 is connected to the friction wheel 2, and the other end is pulled by the metal wire 7. The opening and closing of the friction wheel 2 and the tire is controlled by the spring device 8; the outside of the refrigerator 4 is an insulating layer 15, the inside of the insulating layer 15 is an aluminum inner tank 16, and the side wall of the refrigerator 4 is provided with aluminum fins 17.

The Stirling refrigerator is a double-piston structure driven by a crank connecting rod mechanism. The central rotating shaft 14 of the crank connecting rod mechanism rigidly passes through the pulley, with a diameter of 3.2cm, and is connected to the friction wheel 2. The friction wheel and the rear wheel of the bicycle form a transmission device. The rod and the linkage rod are connected by a bearing, the two linkage rods and the piston rod are connected by a universal rotary joint, and the piston rod and the piston are welded.

The friction wheel 2 is placed on both sides of the rear wheel of the bicycle. The surface of the friction wheel is made of rubber material with a diameter of 2.5cm, which can increase the friction force to facilitate transmission, and can also reduce the wear of the tire. The whole device has an automatic adjustment fit to the brake wheel.

The inside of the annular regenerator 9 is filled with stacked metal wire mesh, which is a typical porous medium. The regenerator is connected to the refrigeration cylinder 10 and the cooling cylinder 11 of the Stirling refrigerator by means of metal insulation material pipes, and the pipes and the cylinder body are directly welded.

The control switch 6 of the control system is located at the handlebar, and is connected to the control lever 5 through a metal wire 7. One end of the lever is connected to the friction wheel, and the other end can be pulled by the metal wire. The spring device 8 is used to control the opening and closing of the friction wheel and the tire.

The inside of the refrigerator box 4 is made of a thermal insulation layer 15 , an aluminum inner tank 16 and an aluminum rib 17 . The top of the refrigeration cylinder of the Stirling refrigerator is directly connected to the inside of the refrigerator through the fins, so that the heat exchange between the two is more sufficient. The thermal insulation layer is composed of foamed rigid polyurethane foam and high-density foam board with good thermal insulation performance. The rib should be laid on the wall of the refrigerator in the form of a grid, and the junction with the box should be welded.

The bicycle installed by the device is a bicycle with normal structure on the market, such as a scooter, a mountain bike, and the like.

The working principle of the overall device: when a person rides a bicycle, the chain is driven to rotate by stepping on the pedal, which in turn drives the rear wheel of the bicycle to rotate, and the friction wheel 2 rotates in contact with the rear wheel. The high rotation speed required by the refrigerator drives the pulley to rotate, and then the central shaft 14 of the crank connecting rod mechanism in the Stirling refrigerator rotates, the central shaft drives the central rod to rotate, the central rod drives the piston rod to reciprocate, and the piston pushes the cylinder The working fluid undergoes four processes of isothermal compression, isothermal heat release, isothermal expansion, and isovolumic heat absorption between the refrigeration cylinder, the cooling cylinder and the regenerator to complete a cycle. The refrigerating box 4 is connected internally, and the cold energy is directly stored in the refrigerating box to create a low-temperature space. The theoretical cooling power is 74-124W. The control switch 6 can adjust the opening and closing of the friction wheel and the rear wheel at any time, thereby controlling the intermittent cooling of the Stirling machine and realizing the effective use of mechanical energy.

The following description will be given in conjunction with specific embodiments.

Example 1

The above-mentioned device was used to explore the temperature changes of the incubator and storage during cycling. The experiment was set up at a room temperature of 23.6 °C and the riding speed was controlled at 4 m/s for 1 hour. The space temperature of the incubator and the temperature changes of two bottles of bottled water with an initial temperature of 21.9 °C were investigated. The temperature of the space in the incubator decreases with the increase of riding time. The change trend is fast at first and then slow. The cooling speed is very fast at the beginning, almost showing a proportional straight line. stable at 9.0°C. The refrigeration of bottled water is an indirect refrigeration using the air in the box as a medium, so there will be a certain heat transfer temperature difference with the air in the box, and the cooling effect will also have a lag; the water temperature is affected by this, and the decreasing trend shows first slow and then fast Slow down again, and there is a temperature difference of 3-6 ℃ with the air, and the rate of decline reaches the maximum at 33 minutes, and the temperature difference with the temperature in the box is also the largest at this time. After 1 hour of riding, the water temperature dropped to 12.3°C, the difference with the air temperature was 3.3°C, a drop of 9.6°C compared to the initial temperature.

Example 2

The same device as in Example 1 was used, the initial temperature in the incubator was set at 25°C, the initial temperature of the two bottles of bottled water was 23°C, and other conditions were the same as those in Example 1. According to the above operating conditions, the temperature in the incubator was finally measured to be stable at 10.3°C, and the water temperature dropped to 13.2°C, which was 9.8°C lower than the initial water temperature.

Example 3

Using the same device in Example 1, the riding speed was controlled at 5 m/s for 1 hour, and other conditions were the same as in Example 1. According to the above operating conditions, the temperature in the incubator was finally measured to be stable at 7.8°C, and the water temperature dropped to 11.1°C, which was 10.8°C lower than the initial water temperature.

Example 4

Using the same device in Example 1, the riding speed was controlled at 4 m/s for 1.5 hours, and other conditions were the same as in Example 1. According to the above operating conditions, the temperature in the incubator was finally measured to be stable at 8.4°C, and the water temperature dropped to 11.8°C, which was 10.1°C lower than the initial water temperature.

Example 5

In the process of riding a bicycle, it is inevitable to encounter an uphill road or an emergency that needs to remove the friction wheel or stop, which will lead to discontinuous operation of the refrigerator. Therefore, the changes of the temperature in the box and the temperature of the water with the riding time were investigated if the experimental device was riding intermittently. The riding speed is still 4m/s. In the initial state, the temperature in the box and the water temperature are 23.7℃ and 22.5℃ respectively. The total running time of the refrigerator is 1 hour, and it stops working intermittently for 10 minutes every 10 minutes of operation. During intermittent operation, the heat transfer temperature difference between water and air is relatively average, about 3.5°C, with no major change. The final temperature in the box is 9.4°C, and the water temperature drops to 13.2°C, which is 9.3°C lower than the initial water temperature.

The device effectively solves the problems of inconvenience of taking out food during summer travel and low energy utilization efficiency when riding, and has the advantages of lightness and portability, cooling capacity can be used at any time of production, device integration, and wide promotion range. At the same time, when the Stirling machine is working, the rotor rotates forward to cool and reverse to generate heat. After the refrigerating box is modified, the effect of the incubator can be achieved, and the economic benefit can be doubled. The device realizes the efficient utilization of the mechanical energy of the bicycle while riding, and its design idea conforms to the national concept of energy conservation, emission reduction and sustainable development, and has broad application prospects.

The above is the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (6)

1. A bicycle refrigerating plant based on wheel and friction wheel diameter ratio variable speed transmission, its characterized in that: the refrigerating device comprises a friction wheel (2), a Stirling refrigerator (3), a refrigerating box (4) and a control system, wherein the Stirling refrigerator (3) comprises a heat regenerator (9), a refrigerating cylinder (10), a heat dissipation cylinder (11), a compression piston (12), an expansion piston (13) and a central rotating shaft (14), the refrigerating box (4) comprises a heat insulation layer (15), an aluminum inner container (16) and aluminum fins (17), the control system comprises a control lever (5), a control switch (6), a metal wire (7) and a spring device (8), a tire of a bicycle (1) is connected with the friction wheel (2), the friction wheel (2) is connected with the Stirling refrigerator (3) through a rotor, the cold end of the Stirling refrigerator (3) is connected with the refrigerating box (4), the heat regenerator (9) is connected with the refrigerating cylinder (10) and the heat dissipation cylinder (11), the compression piston (12) and the expansion piston (13) are respectively connected to two flywheels, the two flywheels are connected with a central rotating shaft (14), the central rotating shaft (14) rotates to drive a compression piston (12) and an expansion piston (13) to complete a circulation process in a heat dissipation cylinder (11) and a refrigeration cylinder (10), a control switch (6) is located at a handlebar, the control switch (6) is connected with a control lever (5) through a metal wire (7), one end of the control lever (5) is connected with the friction wheel (2), the other end of the control lever is pulled by the metal wire (7), and the friction wheel (2) and the tire are controlled to be separated and combined through a spring device (8); the outside of the refrigerating box (4) is provided with a heat-insulating layer (15), the inside of the heat-insulating layer (15) is provided with an aluminum liner (16), and the side wall of the refrigerating box (4) is provided with aluminum fins (17).

2. A bicycle refrigeration unit based on a variable speed drive with a wheel to friction wheel diameter ratio according to claim 1, wherein: the bicycle (1) provides mechanical energy for the Stirling refrigerator (3), and the low rotating speed of the bicycle wheels is converted into the high rotating speed required by the refrigerator rotor through the ratio variable speed transmission of the diameters of the bicycle (1) wheels and the friction wheel (2), wherein the low rotating speed is 100-300 r/min, and the high rotating speed is 2000-4000 r/min.

3. A bicycle refrigeration unit based on a variable speed drive with a wheel to friction wheel diameter ratio according to claim 1, wherein: the diameter of the friction wheel (2) is 2.5cm, and the surface of the friction wheel (2) is made of a rubber material.

4. A bicycle refrigeration unit based on a variable speed drive with a wheel to friction wheel diameter ratio according to claim 1, wherein: the heat-insulating layer (15) is made of foaming rigid polyurethane foam plastic and has apparent density of 20-23 kg/m³The density of the foamed rigid polyurethane foam is 35-40 kg/m³The thermal conductivity is 0.018 to 0.024W/(m.k).

5. A bicycle refrigeration unit based on a variable speed drive with a wheel to friction wheel diameter ratio according to claim 1, wherein: the compression piston (12) and the expansion piston (13) complete cycle processes in the refrigeration cylinder (10) and the heat dissipation cylinder (11), wherein each cycle process comprises four processes of isothermal compression, isochoric heat release, isothermal expansion and isochoric heat absorption.

6. A bicycle refrigeration unit based on a variable speed drive with a wheel to friction wheel diameter ratio according to claim 1, wherein: and a stacked wire mesh is filled in the heat regenerator (9) and is formed by firstly molding and then stacking wire mesh sheets.

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