Air conditioning system of double-steel-wheel road roller and control method of air conditioning system

Abstract

The invention discloses an air conditioning system of a double-steel-wheel road roller and a control method thereof, the system comprises an air conditioning module which forms a refrigeration circulation loop through an evaporator, a compressor, a condenser and an expansion valve, and the refrigeration circulation loop is used for refrigerating a cab of the double-steel-wheel road roller; the water path system comprises a water tank, a water pump and a sprinkler head; the sprinkler head is arranged on the air inlet side of a condenser of the air conditioner module and used for spraying water mist to the surfaces of fins of the condenser. The control system comprises a controller, a cab temperature sensor, an asphalt temperature sensor and a control switching device; the performance of the air conditioner of the road roller under the extreme high-temperature working condition is effectively improved, and the long-standing pain point in the industry is solved.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and in particular relates to an air conditioning system for a double-drum road roller and its control method. Background Technology

[0002] In asphalt pavement construction, the compaction temperature of the asphalt mixture must be strictly controlled between 100-140℃, which is crucial for ensuring the compaction quality and long-term durability of the pavement. As a core compaction device, the double-drum roller must operate continuously for extended periods in this high-temperature environment. The air conditioning system in the cab is essential for ensuring the comfort, health, and concentration of the operators. However, existing double-drum roller air conditioning systems typically have their condensers located inside the equipment, resulting in poor heat dissipation. Especially in the hot summer, combined with the radiant heat from the asphalt, the ambient temperature far exceeds the conventional design conditions, leading to excessively high condensing pressure, a sharp drop in cooling efficiency, or even system failure. Simply improving the performance of the air conditioning system components (such as increasing compressor power and condenser area) is insufficient to meet the urgent cooling needs of the cab during actual construction, becoming a common industry problem restricting equipment applicability and operator experience. Therefore, an innovative solution that can effectively improve the working environment of the air conditioning system and enhance its high-temperature adaptability is urgently needed. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide an air conditioning system for a double-drum road roller and its control method that can improve the air conditioning cooling performance.

[0004] Technical solution: The air conditioning system for a double drum road roller according to the present invention includes: an air conditioning module, a water system, and a control system;

[0005] The air conditioning module, through an evaporator, compressor, condenser and expansion valve, forms a refrigeration cycle loop for cooling the cab of the double drum roller.

[0006] The water system includes a water tank, a water pump, and sprinkler heads; the sprinkler heads are located on the air inlet side of the condenser of the air conditioning module and are used to spray water mist onto the surface of the condenser fins.

[0007] The control system includes a controller, a cab temperature sensor, an asphalt temperature sensor, and a control switching device.

[0008] Furthermore, the cab temperature sensor is used to monitor the temperature inside the cab, the asphalt temperature sensor is used to monitor the radiation temperature of the asphalt pavement or the ambient temperature of the environment where the roller is located, and the controller is used to issue commands to control the water pump and sprinkler heads of the water system.

[0009] Furthermore, the control system allows operators to switch operating modes via a control switching device, and the operating modes include manual mode and automatic mode.

[0010] Furthermore, the manual mode specifically refers to the operator manually controlling the start / stop of the water pump and sprinkler heads of the water system and the spraying time through the controller.

[0011] Furthermore, the automatic mode specifically refers to the controller automatically adjusting the start / stop and spraying time of the water pump and sprinkler heads of the water system according to the real-time signals fed back by the cab temperature sensor and the asphalt temperature sensor, and in accordance with the preset control logic.

[0012] Furthermore, the control logic specifically includes:

[0013] ;

[0014] in, This indicates the pump's operating status; 0 represents not working, and 1 represents working. The temperature fed back by the asphalt temperature sensor; The temperature fed back by the cab temperature sensor; Low temperature threshold, It is the high temperature threshold, and ; This is the threshold temperature for the driver's cab.

[0015] Furthermore, the water system receives instructions from the controller of the control system to control the water pump to draw water from the water tank and spray the water onto the condenser through the sprinkler head.

[0016] Furthermore, the water tank and water pump of the water system use the water storage tank and sprinkler pump that come with the double steel drum road roller.

[0017] Furthermore, it also includes a recycling module for recovering the condensate generated during the cooling process of the air conditioning module and injecting it into the water tank of the water system.

[0018] Based on the same inventive concept, the present invention also provides a control method for an air conditioning system of a double-drum roller according to any one of the above claims, comprising:

[0019] The air conditioning system starts working, and the control system switches to manual or automatic mode according to the operator's instructions;

[0020] When switched to manual mode, the operator manually sends commands to the water system via the controller to control the start and stop of the water pump and sprinkler heads, as well as the spraying time. When switched to automatic mode, the controller sends commands to the water system according to the preset control logic based on the real-time signals fed back by the cab temperature sensor and the asphalt temperature sensor, to automatically adjust the start and stop of the water pump and sprinkler heads, as well as the spraying time.

[0021] The water system controls the water pump to draw water from the water tank according to the controller's instructions, and sprays the water onto the condenser through the sprinkler heads;

[0022] The recycling module recovers the condensate generated by the air conditioning module during cooling and injects it into the water tank of the water system.

[0023] Beneficial Effects: Compared with existing technologies, this invention has the following significant effects: 1. By applying the inherent steel wheel water spraying system of the road roller to the air conditioning condenser for cooling, it directly addresses the core problem of air conditioning failure caused by high-temperature operating environments. With a simple and reliable auxiliary device, it significantly improves the performance of the air conditioning under extreme conditions, filling a gap in existing technology; 2. By integrating dual temperature sensors (cabin temperature and asphalt temperature) and an intelligent controller, the system can sense the operating load in real time and automatically and dynamically optimize the water spray volume. This avoids the inconvenience and inaccuracy of relying on manual adjustment based on operator experience, achieving water conservation and energy-saving operation of the system while ensuring the best cooling effect; 3. This system not only improves the comfort of the cab and enhances the cooling of components such as the condenser and adjacent hydraulic oil radiator by increasing the water spray volume, but also helps prevent alarms or performance limitations caused by high temperatures, ensuring that the double steel wheel road roller can operate continuously and stably in high-temperature environments, thus broadening the applicable operating conditions of the equipment; 4. It makes full use of the existing water spraying system of the road roller, with low modification costs and no need for complex modifications to the air conditioning unit, making it easy to modify, promote, and implement on existing models. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system modules in an embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the air conditioning system for the double drum roller in this embodiment includes: an air conditioning module 2, a water system 4, and a control system 1;

[0027] The air conditioning module, through an evaporator, compressor, condenser and expansion valve, forms a refrigeration cycle loop for cooling the cab of the double drum roller.

[0028] The water system includes a water tank, a water pump, and sprinkler heads; the sprinkler heads are located on the air inlet side of the condenser of the air conditioning module and are used to spray water mist onto the surface of the condenser fins.

[0029] The control system includes a controller, a cab temperature sensor, an asphalt temperature sensor, and a control switching device.

[0030] The control system 1 described in this embodiment includes a cab temperature sensor 1.3, an asphalt temperature sensor 1.4, and a controller 1.5. It can select either manual mode 1.1 or automatic mode 1.2 as input to the controller 1.5 based on operator instructions. The cab temperature sensor 1.3 and the asphalt temperature sensor 1.4 are the signal inputs to the controller 1.5. Simultaneously, the controller 1.5 can control the operation of the water pump 1.2 in the water system 4. The cab temperature sensor 1.3 monitors the temperature inside the cab, and the asphalt temperature sensor 1.4 monitors the radiant temperature of the asphalt pavement or the ambient temperature of the environment where the roller is located.

[0031] The air conditioning module 2 in this embodiment includes an evaporator 2.1, a compressor 2.2, a condenser 2.3, and an expansion valve 2.4. The refrigerant is compressed by the compressor 2.2, and the high-temperature, high-pressure gaseous refrigerant flows to the condenser 2.3. The condenser 2.3 exchanges heat with the outdoor air, turning the refrigerant into a low-temperature, high-pressure liquid. It then passes through the expansion valve 2.4 and becomes a low-temperature, low-pressure gas, before flowing back to the evaporator 2.1. The evaporator 2.1 absorbs heat from the indoor air, thus lowering the temperature of the driver's cab 3.

[0032] The water system 4 in this embodiment includes a sprinkler head 4.1, a water pump 4.2, and a water tank 4.3. The water pump 4.2 is controlled by the controller 1.5 to draw water from the water tank 4.3 and spray it onto the condenser 2.3 through the sprinkler head 4.1. The cooling effect of the air conditioning module 2 is further improved by utilizing the principle of water evaporation and heat absorption.

[0033] Furthermore, in this embodiment, there are manual mode 1.1 and automatic mode 1.2: manual mode 1.1 can be turned on by the operator, who can directly control the water pump through the controller 1.5. In automatic mode 1.2, the controller 1.5 controls the water pump based on the following logic: combined with the temperature of the cab 3 and the asphalt temperature, it intelligently controls the water volume of the sprinkler head to optimize the effect of the road roller's air conditioning system.

[0034] ;

[0035] in, This indicates the pump's operating status; 0 represents not working, and 1 represents working. The temperature fed back by the asphalt temperature sensor; The temperature is fed back by the cab temperature sensor; the unit of temperature parameter is °C.

[0036] Furthermore, the water tank 4.3 and water pump 4.2 of the water system use the water storage tank and sprinkler pump that come with the double steel drum roller.

[0037] This embodiment also includes a recycling module for recovering the condensate generated during the cooling process of the air conditioning module and injecting it into the water tank of the water system.

[0038] The core of the intelligent control method based on the above system in this embodiment is: when the air conditioning system is working, the control system switches to manual mode or automatic mode according to the operator's instructions.

[0039] When switched to manual mode, the operator manually sends commands to the water system via the controller to control the start / stop and spraying time of the water pump and sprinkler heads. When switched to automatic mode, the controller, based on real-time signals from the cab temperature sensor and asphalt temperature sensor, and according to preset control logic, automatically adjusts the start / stop and spraying time of the water pump and sprinkler heads.

[0040] The water system, following the controller's instructions, directs the water pump to extract water from the tank and sprays it onto the air conditioner condenser using sprinkler heads. The water mist evaporates on the condenser surface and in the air, absorbing a large amount of heat. This rapidly lowers the temperature of the air flowing through the condenser and the condenser itself, significantly reducing the condensing pressure and temperature of the refrigeration system, thereby improving the overall cooling efficiency and capacity of the air conditioning system.

[0041] The purpose of this invention is to improve the air conditioning cooling effect without changing or increasing the power of the air conditioning compressor. To this end, it provides a rationally structured and intelligently controlled air conditioning system for a double-drum road roller and its control method. This invention aims to utilize the road roller's built-in water spraying system to fundamentally improve the heat dissipation conditions of the air conditioning system by spraying water onto the air conditioning condenser for cooling, significantly enhancing its cooling performance and achieving intelligent energy-saving control. This ensures a comfortable environment in the cab and improves the road roller's adaptability and continuity of operation under extreme conditions.

Claims

1. An air conditioning system for a double-drum road roller, characterized in that, include: Air conditioning modules, water system and control system; The air conditioning module, through an evaporator, compressor, condenser and expansion valve, forms a refrigeration cycle loop for cooling the cab of the double drum roller. The water system includes a water tank, a water pump, and sprinkler heads; the sprinkler heads are located on the air inlet side of the condenser of the air conditioning module and are used to spray water mist onto the surface of the condenser fins. The control system includes a controller, a cab temperature sensor, an asphalt temperature sensor, and a control switching device.

2. The air conditioning system for a double-drum roller according to claim 1, characterized in that, The cab temperature sensor is used to monitor the temperature inside the cab, the asphalt temperature sensor is used to monitor the radiation temperature of the asphalt pavement or the ambient temperature of the environment where the roller is located, and the controller is used to issue commands to control the water pump and sprinkler heads of the water system.

3. The air conditioning system for a double-drum roller according to claim 1, characterized in that, The control system allows operators to switch operating modes via a control switching device. The operating modes include manual mode and automatic mode.

4. The air conditioning system for a double-drum roller according to claim 3, characterized in that, The manual mode specifically refers to the operator manually controlling the start / stop and spraying time of the water pump and sprinkler heads of the water system through the controller.

5. The air conditioning system for a double-drum roller according to claim 3, characterized in that, The automatic mode specifically refers to the controller automatically adjusting the start / stop and spraying time of the water pump and sprinkler heads of the water system according to the real-time signals fed back by the cab temperature sensor and the asphalt temperature sensor, and in accordance with the preset control logic.

6. The air conditioning system for a double-drum roller according to claim 5, characterized in that, The control logic is specifically as follows: ； in, This indicates the pump's operating status; 0 represents not working, and 1 represents working. The temperature fed back by the asphalt temperature sensor; The temperature fed back by the cab temperature sensor; Low temperature threshold It is the high temperature threshold, and ; This represents the cab temperature threshold.

7. The air conditioning system for a double-drum roller according to claim 1, characterized in that, The water system receives instructions from the controller of the control system, controls the water pump to draw water from the water tank, and sprays the water onto the condenser through the sprinkler heads.

8. The air conditioning system for a double-drum roller according to claim 1, characterized in that, The water system uses the water tank and water pump that come with the double-drum roller.

9. The air conditioning system for a double-drum roller according to claim 1, characterized in that, It also includes a recycling module, which is used to recover the condensate generated by the air conditioning module during cooling and inject it into the water tank of the water system.

10. A control method for an air conditioning system of a double-drum roller according to any one of claims 1 to 9, characterized in that, include: The air conditioning system starts working, and the control system switches to manual or automatic mode according to the operator's instructions; When switched to manual mode, the operator manually sends commands to the water system via the controller to control the start and stop of the water pump and sprinkler heads, as well as the spraying time. When switched to automatic mode, the controller sends commands to the water system according to the preset control logic based on the real-time signals fed back by the cab temperature sensor and the asphalt temperature sensor, to automatically adjust the start and stop of the water pump and sprinkler heads, as well as the spraying time. The water system controls the water pump to draw water from the water tank according to the controller's instructions, and sprays the water onto the condenser through the sprinkler heads; The recycling module recovers the condensate generated by the air conditioning module during cooling and injects it into the water tank of the water system.

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