Hydraulic combined heating system, heating method and engineering equipment

Abstract

The invention discloses a hydraulic combined type heating system, a heating method and engineering equipment in the field of hydraulic systems. The hydraulic combined type heating system comprises a first temperature sensor arranged in an oil suction cavity of an oil tank; the second temperature sensor is arranged in an oil return cavity of the oil tank; the hydraulic power unit is circularly communicated with the oil suction cavity and the oil return cavity; the heating piece is arranged outside the oil tank and used for heating the hydraulic oil in the oil tank; the controller is electrically connected with the first temperature sensor, the second temperature sensor, the hydraulic power unit and the heating piece; the controller is configured to compare temperature information of the first temperature sensor and the second temperature sensor with a preset group value to realize switching of circulation modes of the hydraulic power unit; according to the temperature information fed back by the two temperature sensors, the controller enables return oil of the hydraulic power unit to enter the oil suction cavity or the oil return cavity, hydraulic oil circulation in different stages is achieved, and the hydraulic heating efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic system technology, specifically to hydraulic combined heating systems, heating methods, and engineering equipment. Background Technology

[0002] Mobile aerial work platforms are a type of aerial work equipment widely used worldwide, boasting advantages such as flexible operation, high efficiency, and safe and convenient operation. To meet the needs of extremely cold regions, current mobile aerial work platforms typically employ heating pads attached to the outer surface of the hydraulic oil tank. These electrically controlled heating pads transfer heat to the hydraulic oil within the tank, raising its temperature and ensuring the normal operation of the hydraulic system. However, due to the irregular shape of the hydraulic oil tank and limitations in external assembly space, the heating pads cannot fully cover the entire tank. This results in a slow temperature rise in the hydraulic system, and the lack of fluid flow leads to poor heat transfer, causing significant temperature differences between uncovered and covered areas. Consequently, the system's heating efficiency is low, and the oil temperature is uneven, which can severely impact the normal operation of the hydraulic system.

[0003] As users demand higher efficiency, balanced hydraulic oil temperature, and reliability from hydraulic heating systems, the need for mobile lifting work platforms equipped with highly efficient controlled heating hydraulic systems is becoming increasingly prominent.

[0004] Due to the limited external space of the hydraulic oil tank, the heating pads cannot cover the entire tank, resulting in a slow and uneven rise in oil temperature within the hydraulic system. Summary of the Invention

[0005] The purpose of this application is to provide a hydraulic combined heating system, heating method and engineering equipment to solve the technical problems of slow and uneven oil temperature rise in the oil tank in related technologies.

[0006] To achieve the above objectives, this application employs the following technical solution: In a first aspect, this application discloses a hydraulic combined heating system, which includes... A first temperature sensor is installed inside the oil suction chamber of the oil tank to detect and generate temperature information of the hydraulic oil inside the oil suction chamber; A second temperature sensor is installed in the return oil chamber of the oil tank to detect and generate temperature information of the hydraulic oil in the return oil chamber; A hydraulic power unit that circulates between the oil suction chamber and the oil return chamber; A heating element installed outside the oil tank is used to raise the temperature of the hydraulic oil in the tank; The controller is electrically connected to the first temperature sensor, the second temperature sensor, the hydraulic power unit, and the heating element; the controller is configured to control the switching of the circulation mode of the hydraulic power unit and the oil tank cavity based on the temperature information of the first temperature sensor and the second temperature sensor and a preset group value.

[0007] In a further embodiment of this application, the hydraulic power unit is provided with an inlet P1, a return port T1, and a return port T2. The inlet P1 and the return port T1 are connected to the oil suction chamber, and the return port T2 is connected to the oil return chamber. The controller adjusts and selects the return port of the hydraulic power unit based on the temperature information of the first temperature sensor and the second temperature sensor and a preset group value.

[0008] In a further embodiment, the hydraulic power unit includes a main control valve, an electro-proportional relief valve, an oil pump, and a return oil control valve; The oil pump is connected at both ends to the inlet P1 and the inlet of the main control valve. The second outlet of the main control valve is connected to the inlet of the electro-proportional relief valve. The outlet of the electro-proportional relief valve is connected to the inlet of the return oil control valve. The first outlet and the second outlet of the return oil control valve are connected to the return oil outlet T1 and the return oil outlet T2 in a one-to-one correspondence. The controller adjusts the opening and closing of the main control valve, the electro-proportional relief valve, and the return oil control valve by comparing the temperature information from the first temperature sensor and the second temperature sensor with preset values.

[0009] In a further embodiment of this application, the oil tank is provided with a partition, the partition has through holes, and the partition separates the oil tank to form the oil suction chamber and the oil return chamber.

[0010] In a further embodiment of this application, the working port A of the hydraulic power unit is connected to the oil inlet P2 of the power module, and the oil return chamber is connected to the oil outlet T of the power module. If the oil temperature is within acceptable limits, the controller controls the hydraulic power unit to connect to the oil inlet P2 to supply oil to the power module.

[0011] Secondly, this application discloses a heating method based on the aforementioned hydraulic combined heating system, comprising: The controller controls the heating element to heat the oil tank, and the controller executes a first mode, a second mode, and a third mode. The first mode is configured to control the hydraulic oil to circulate between the hydraulic power unit and the oil suction chamber based on the temperature information fed back by the first temperature sensor; The second mode is configured to control the hydraulic oil to circulate between the hydraulic power unit, the oil suction chamber, and the oil return chamber based on the temperature information fed back by the second temperature sensor. The third mode is configured to de-energize the valves of the hydraulic power unit and the heating element based on the temperature information fed back by the first temperature sensor and the second temperature sensor.

[0012] Further solutions in this application, The controller is set with preset temperatures t1 and t2, and a qualified temperature t3; where t3 > t2 and t1. When the real-time temperature of the first temperature sensor is not less than t1, the controller executes the first mode. The first mode includes the controller controlling the main control valve, the electro-proportional relief valve and the oil pump to be energized, the return oil control valve to be de-energized, and the hydraulic oil to circulate between the oil suction chamber and the hydraulic power unit. When the real-time temperature of the second temperature sensor is not less than t2, the controller executes the second mode. The second mode includes the controller controlling the main control valve, the electro-proportional relief valve, the return oil control valve and the oil pump to be energized, and the hydraulic oil circulates between the return oil chamber, the suction oil chamber and the hydraulic power unit. When the real-time temperatures of the first and second temperature sensors are equal to t3, the controller executes the third mode, which includes de-energizing the main control valve, the electro-proportional relief valve, and the return oil control valve, and supplying oil to the power module from the oil tank.

[0013] Further solutions, When the controller executes the first mode and the second mode, the electro-proportional relief valve generates heat energy by performing work.

[0014] Thirdly, this application also discloses an engineering device that includes the aforementioned hydraulic combined heating system, or uses the aforementioned heating method.

[0015] The beneficial effects of this application are as follows: In this application, the oil tank is heated by a heating element, and the hydraulic oil in the tank is circulated by a hydraulic power unit. Based on the temperature information fed back by the first temperature sensor, the return oil of the hydraulic power unit is directed to enter the oil suction chamber or the oil return chamber, thereby realizing the circulation of hydraulic oil in different ranges and improving the hydraulic heating efficiency. When the hydraulic power unit is working, the energy consumption of its internal electro-proportional relief valve is converted into heat energy to heat the hydraulic oil, which raises the temperature of the hydraulic oil. Combined with the above-mentioned circulation function, the high-temperature hydraulic oil is circulated in the return oil chamber and the suction oil chamber, further improving the overall oil temperature rise rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hydraulic combined heating system in the embodiments of this application; Figure 2This is a schematic diagram of the heating method of the hydraulic combined heating system in the embodiments of this application; in: 1. Oil tank; 1.1. Oil suction chamber; 1.2. Oil return chamber; 2. Baffle; 3. Hydraulic power unit; 3.1. Motor; 4. Power module; 3.2. Main control valve; 3.3. Electro-proportional relief valve; 3.4. Oil return control valve; 5. First temperature sensor; 6. Second temperature sensor. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0018] like Figure 1 As shown, this application provides an embodiment that discloses a hydraulic combined heating system, which includes... First temperature sensor 5, second temperature sensor 6, hydraulic power unit 3, and heating element (heating pad); The first temperature sensor 5 is installed in the oil suction chamber 1.1 of the oil tank 1 to detect and generate the temperature information of the hydraulic oil in the oil suction chamber 1.1; the second temperature sensor 6 is installed in the oil return chamber 1.2 of the oil tank 1 to detect and generate the temperature information of the hydraulic oil in the oil return chamber 1.2; a partition 2 is added to the oil tank 1, which divides the oil tank 1 into two chambers, the oil return chamber 1.2 and the oil suction chamber 1.1. The partition 2 is provided with through holes to allow hydraulic oil to flow; the hydraulic power unit 3 circulates between the oil suction chamber 1.1 and the oil return chamber 1.2; the heating element is fixed on the outer surface of the oil tank 1 for heating the hydraulic oil in the oil tank 1; The controller is electrically connected to the first temperature sensor 5, the second temperature sensor 6, the hydraulic power unit 3, and the heating element; the controller is configured to switch the cycle mode of the hydraulic power unit 3 based on the temperature information of the first temperature sensor 5 and the second temperature sensor 6 and the preset group value.

[0019] In use, the controller sends a heating command to the heating element, which then begins to heat the oil tank 1. When the first temperature sensor 5 detects the preset temperature, the hydraulic power unit 3 starts working to circulate the hydraulic oil in the oil suction chamber 1.1. As time goes on, when the second temperature sensor 6 detects the preset temperature, the hydraulic power unit 3 switches the circuit to circulate the hydraulic oil in the overall oil tank 1. This adaptive, phased working cycle greatly improves the heating efficiency of the hydraulic oil.

[0020] In some embodiments, a hydraulic combined heating system is designed as follows; Continue to observe the appendix Figure 1 In this embodiment, the hydraulic power unit 3 is provided with an inlet P1, an oil return port T1 and an oil return port T2. The inlet P and the oil return port T1 are connected to the oil suction chamber 1.1, and the oil return port T2 is connected to the oil return chamber 1.2. The controller adjusts and selects the oil return port of the hydraulic power unit 3 according to the temperature information of the first temperature sensor 5 and the second temperature sensor 6 and the preset group value.

[0021] The hydraulic power unit 3 in this embodiment includes a main control valve 3.2, an electro-proportional relief valve 3.3, an oil pump, and a return oil control valve 3.4. The oil pump is connected to the inlet P1 and the inlet of the main control valve 3.2 at both ends. The second outlet of the main control valve 3.2 is connected to the inlet of the electro-proportional relief valve 3.3. The outlet of the electro-proportional relief valve 3.3 is connected to the inlet of the return oil control valve 3.4. The first outlet and the second outlet of the return oil control valve 3.4 are connected to the return oil ports T1 and T2 in a one-to-one correspondence. The controller adjusts the opening and closing of the main control valve 3.2, the electro-proportional relief valve 3.3, and the return oil control valve 3.4 by comparing the temperature information from the first temperature sensor 5 and the second temperature sensor 6 with the preset group value.

[0022] The hydraulic power unit 3 is also connected to the power module 4. The first oil outlet of the main control valve 3.2 is connected to the working port A of the hydraulic power unit 3. The working port A is connected to the oil inlet P2 of the power module 4. The return oil chamber 1.2 is connected to the oil outlet T of the power module 4. When in use, if the hydraulic oil temperature is qualified, the controller controls the hydraulic power unit 3 to connect to the oil inlet P2, and the oil pump supplies oil to the power module 4. The hydraulic oil flows back to the return oil chamber 1.2 of the oil tank 1 after passing through the power module 4.

[0023] As attached Figure 2 As shown, this application also provides another embodiment, which discloses a heating method based on the hydraulic combined heating system in the above embodiment; The controller issues a heating command to control the heating element to heat the oil tank 1. The controller can execute the first mode, the second mode and the third mode. The first mode is configured to control the hydraulic oil to circulate between the hydraulic power unit 3 and the oil suction chamber 1.1 based on the temperature information fed back by the first temperature sensor 5; The second mode is configured to control the hydraulic oil to circulate between the hydraulic power unit 3, the suction chamber 1.1 and the return chamber 1.2 based on the temperature information fed back by the second temperature sensor 6. The third mode is configured to de-energize the valves and heating elements in the hydraulic power unit 3 based on the temperature information fed back by the first temperature sensor 5 and the second temperature sensor 6.

[0024] The heating method is explained in detail below; First, the controller is set to preset temperatures t1 and t2, and a qualified temperature t3; in this embodiment, t3 > t2 and t1. When the real-time temperature of the first temperature sensor 5 is not less than t1, the controller executes the first mode, that is, the controller controls the solenoid coil Y1 of the main control valve 3.2 in the power unit to be energized, the solenoid coil Y3 of the return oil control valve 3.4 to be de-energized, the solenoid coil Y2 of the electro-proportional relief valve 3.3 to be energized, and controls the motor 3.1 to output speed n1, and the oil pump to output flow rate Q1. The high-pressure oil enters the inlet of the electro-proportional relief valve 3.3 from the inlet of the main control valve 3.2, and then enters the inlet of the return oil control valve 3.4 from the outlet of the electro-proportional relief valve 3.3. Finally, it returns to the suction chamber 1.1 through the first outlet of the return oil control valve 3.4 to the return port T1 of the power unit. At the same time, the hydraulic power unit 3 heats the hydraulic oil through the heat generated by the power consumption of the electro-proportional relief valve 3.3, so that the temperature of the hydraulic oil rises, realizing the flow and circulation of high-temperature hydraulic oil in the suction chamber 1.1, and improving the heating efficiency of the hydraulic oil. When the real-time temperature of the second temperature sensor 6 is not less than t2, the controller can execute the second mode, that is, the solenoid coil Y1 of the main control valve 3.2 is energized, the solenoid coil Y3 of the return oil control valve 3.4 is energized, and the solenoid coil Y2 of the electro-proportional relief valve 3.3 is energized. The controller also controls the motor 3.1 to output speed n2 and the oil pump to output flow rate Q2. The high-pressure oil enters the inlet of the electro-proportional relief valve 3.3 from the inlet of the main control valve 3.2, and then enters the inlet of the return oil control valve 3.4 from the outlet of the electro-proportional relief valve 3.3. Finally, it returns to the return oil chamber 1.2 through the second outlet of the return oil control valve 3.4 to the return oil port T2 of the power unit. At the same time, the hydraulic power unit 3 heats the hydraulic oil through the electro-proportional relief valve 3.3, raising the temperature of the hydraulic oil and realizing the flow circulation of high-temperature hydraulic oil back to the oil chamber 1.2, thus improving the heating efficiency of the hydraulic oil. When the real-time temperature of the first temperature sensor 5 and the second temperature sensor 6 is equal to t3, the controller executes the third mode, that is, the controller controls the main control valve 3.2, the electro-proportional relief valve 3.3 and the return oil control valve 3.4 to lose power, the oil tank 1 supplies oil to the power module 4, and the power equipment works normally.

[0025] The controller identifies differences in hydraulic oil temperature and controls the energizing current and output speed of motor 3.1, as well as the output flow rate of the oil pump, to optimize the hydraulic oil flow rate, eliminate temperature differences in different areas, and improve the uniformity of hydraulic oil temperature. The combined hydraulic heating system, by monitoring the hydraulic oil temperature in real time, automatically controls the hydraulic oil power unit 3 and the heating elements, enabling the hydraulic oil to achieve an adaptive, phased heating mode. The output pressure and flow rate of the hydraulic heating system automatically optimize response, achieving adaptive, efficient heating and uniform oil temperature.

[0026] This application also provides an embodiment that discloses an engineering device that includes the hydraulic combined heating system described in the above embodiments, or uses the heating method described in the above embodiments.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

Claims

1. A hydraulic combined heating system, characterized in that, include A first temperature sensor is installed inside the oil suction chamber of the oil tank to detect and generate temperature information of the hydraulic oil inside the oil suction chamber; A second temperature sensor is installed in the return oil chamber of the oil tank to detect and generate temperature information of the hydraulic oil in the return oil chamber; A hydraulic power unit that circulates between the oil suction chamber and the oil return chamber; A heating element installed outside the oil tank is used to raise the temperature of the hydraulic oil in the tank; The controller is electrically connected to the first temperature sensor, the second temperature sensor, the hydraulic power unit, and the heating element; the controller is configured to control the switching of the circulation mode of the hydraulic power unit and the oil tank cavity based on the temperature information of the first temperature sensor and the second temperature sensor and a preset group value.

2. The hydraulic combined heating system according to claim 1, characterized in that, The hydraulic power unit is provided with an inlet P1, an oil return port T1, and an oil return port T2. The inlet P1 and the oil return port T1 are connected to the oil suction chamber, and the oil return port T2 is connected to the oil return chamber. The controller adjusts and selects the oil return port of the hydraulic power unit based on the temperature information of the first temperature sensor and the second temperature sensor and the preset group value.

3. The hydraulic combined heating system according to claim 2, characterized in that, The hydraulic power unit includes a main control valve, an electro-proportional relief valve, an oil pump, and a return oil control valve. The oil pump is connected at both ends to the inlet P1 and the inlet of the main control valve. The second outlet of the main control valve is connected to the inlet of the electro-proportional relief valve. The outlet of the electro-proportional relief valve is connected to the inlet of the return oil control valve. The first outlet and the second outlet of the return oil control valve are connected to the return oil outlet T1 and the return oil outlet T2 in a one-to-one correspondence. The controller adjusts the opening and closing of the main control valve, the electro-proportional relief valve, and the return oil control valve by comparing the temperature information from the first temperature sensor and the second temperature sensor with preset values.

4. The hydraulic combined heating system according to claim 1, characterized in that, The oil tank is equipped with a partition, and the partition has through holes. The partition separates the oil tank to form the oil suction chamber and the oil return chamber.

5. The hydraulic combined heating system according to claim 1, characterized in that, The working port A of the hydraulic power unit is connected to the oil inlet P2 of the power module, and the oil return chamber is connected to the oil outlet T of the power module. If the oil temperature is within acceptable limits, the controller controls the hydraulic power unit to connect to the oil inlet P2 to supply oil to the power module.

6. A heating method implemented by the hydraulic combined heating system according to any one of claims 1 to 5, characterized in that, include The controller controls the heating element to heat the oil tank, and the controller executes a first mode, a second mode, and a third mode. The first mode is configured to control the hydraulic oil to circulate between the hydraulic power unit and the oil suction chamber based on the temperature information fed back by the first temperature sensor; The second mode is configured to control the hydraulic oil to circulate between the hydraulic power unit and the oil suction chamber and oil return chamber based on the temperature information fed back by the second temperature sensor; The third mode is configured to de-energize the valves of the hydraulic power unit and the heating element based on the temperature information fed back by the first temperature sensor and the second temperature sensor.

7. The heating method according to claim 6, characterized in that, The controller is set with preset temperatures t1 and t2, and a qualified temperature t3; where t3 > t2 and t1. When the real-time temperature of the first temperature sensor is not less than t1, the controller executes the first mode. The first mode includes the controller controlling the main control valve, the electro-proportional relief valve and the oil pump to be energized, the return oil control valve to be de-energized, and the hydraulic oil to circulate between the oil suction chamber and the hydraulic power unit. When the real-time temperature of the second temperature sensor is not less than t2, the controller can execute the second mode. The second mode includes the controller controlling the main control valve, the electro-proportional relief valve, the return oil control valve and the oil pump to be energized, and the hydraulic oil circulates between the return oil chamber, the suction oil chamber and the hydraulic power unit. When the real-time temperatures of the first and second temperature sensors are equal to t3, the controller executes the third mode. The third mode includes the controller de-energizing the main control valve, the electro-proportional relief valve, and the return oil control valve, and the oil tank supplying oil to the power module through the oil pump.

8. The heating method according to claim 7, characterized in that, When the controller executes the first mode and the second mode, the electro-proportional relief valve generates heat energy by performing work.

9. An engineering device, characterized in that, Includes the hydraulic combined heating system of claims 1 to 5, or the heating method of any one of claims 6 to 8.

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