Engine cabin heat dissipation hydraulic system and engineering machinery

Abstract

The utility model discloses an engine cabin heat dissipation hydraulic system and engineering machinery, a temperature sensor and a hydraulically-driven heat dissipation fan are arranged in an engine cabin, and heat dissipation is carried out on the engine cabin through temperature monitoring of the hydraulically-driven heat dissipation fan and the temperature sensor and control of a controller; the heat dissipation hydraulic system comprises an oil pump, a fan valve group, a hydraulic motor, a heat dissipation fan, a hydraulic oil tank and a temperature sensor. When the temperature of the cabin is higher than the temperature set by the controller, pressure oil provided by the oil pump drives the hydraulic motor and the fan blades to rotate at a high speed through the fan valve group to take away heat in the cabin, and the environment temperature in the cabin is reduced; the engine can have a good working environment temperature, the working efficiency of the engine can be improved to a certain degree, and the service life of the engine can be prolonged to a certain degree.

Description

Technical Field

[0001] The utility model relates to an engine cabin heat dissipation hydraulic system, belonging to the technical field of engineering machinery. Background Art

[0002] At present, most of the construction machinery vehicles such as mining hydraulic excavators used in the global market are engine-driven. The engine will generate and dissipate a lot of heat during operation. Therefore, most machines are equipped with an engine water-cooled circulation heat dissipation system. Although this heat dissipation system can take away most of the heat, when the engine water temperature is relatively high, the engine casing itself also dissipates heat into the air, and the temperature around the engine will continue to rise; however, the design structure of most construction machinery is relatively compact, and the engine compartment is a semi-enclosed structure. When the machine is running for a long time, the high temperature environment of the engine compartment is difficult to release to the outside world or is released very slowly, causing the temperature in the cabin to be too high. In severe cases, it will affect the working efficiency of the engine and even shorten its service life. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides an engine compartment heat dissipation hydraulic system, that is, a hydraulically driven heat dissipation fan is provided in the engine compartment. When the temperature is high, the high-speed rotation of the fan blades driven by a hydraulic motor can be used to take away the heat in the compartment, thereby reducing the ambient temperature in the compartment. In some low-temperature environments and during the process of warming up the car, the heat dissipation fan can be stopped by controlling the reversing of the fan valve group to avoid unnecessary energy loss.

[0004] The utility model is implemented according to the following technical solutions:

[0005] In a first aspect, the utility model provides an engine compartment heat dissipation hydraulic system, comprising:

[0006] A temperature sensor is installed in the engine compartment to monitor the ambient temperature of the engine compartment in real time;

[0007] A cooling fan installed on the side wall of the engine nacelle includes a driving component and fan blades installed on the driving component, and the driving component drives the fan blades to rotate to dissipate heat from the engine nacelle;

[0008] A fan valve group, an oil pump and a hydraulic oil tank, wherein the hydraulic oil tank is connected to the oil inlet of the oil pump, the oil outlet of the oil pump is connected to the P oil port of the fan valve group, the T oil port of the fan valve group is connected to the hydraulic oil tank, the A oil port and the B oil port of the fan valve group are connected to the driving component, and the Pi oil port on the fan valve group is connected to the pilot hydraulic system of the vehicle;

[0009] The controller is connected to the temperature sensor. When the cabin temperature monitored by the temperature sensor is lower than the temperature set by the controller, the controller outputs an electrical signal to the fan valve group, and the fan valve group switches the circuit to cause the cooling fan to stop cooling.

[0010] In some embodiments, the fan valve group includes an electromagnetic proportional pressure reducing valve and a two-position four-way hydraulically controlled reversing valve; the electromagnetic proportional pressure reducing valve is connected to the Pi oil port, and the two-position four-way hydraulically controlled reversing valve is connected to the A oil port, the B oil port, the P oil port, and the T oil port. After receiving the electrical signal output by the controller, the electromagnetic proportional pressure reducing valve outputs the pilot pressure oil to push the valve core of the two-position four-way hydraulically controlled reversing valve to perform reversing.

[0011] In some embodiments, the fan valve assembly further includes a relief valve for limiting the working pressure of the heat dissipation hydraulic system, and the relief valve is connected between the P oil port and the T oil port.

[0012] In some embodiments, two ends of the overflow valve are connected in parallel with a one-way valve for replenishing oil to the cooling fan after shutdown.

[0013] In some embodiments, the fan valve assembly is also provided with a pressure measuring port for facilitating the inspection and maintenance of the heat dissipation hydraulic system.

[0014] In some embodiments, the driving component is a hydraulic motor, and the pressure oil output by the oil pump is delivered to the hydraulic motor through a fan valve group, driving the hydraulic motor to rotate to perform heat dissipation.

[0015] In a second aspect, the utility model provides an engineering machinery including an engine compartment, wherein the engine compartment heat dissipation hydraulic system is installed on the engine compartment.

[0016] In some embodiments, the construction machine comprises an excavator.

[0017] Beneficial effects of the utility model:

[0018] 1. A temperature sensor and a hydraulically driven cooling fan are installed in the engine compartment. The temperature monitoring of the hydraulically driven cooling fan and the temperature sensor and the control of the controller are used to dissipate heat in the compartment. When the compartment temperature is higher than the temperature set by the controller, the pressure oil provided by the oil pump drives the hydraulic motor and its fan blades to rotate at high speed through the fan valve group to take away the heat in the compartment and reduce the ambient temperature in the compartment. This can make the engine have a better working environment temperature, which can improve the working efficiency of the engine and extend the service life of the engine to a certain extent.

[0019] 2. In some low temperature environments and when the car needs to be heated, it is not necessary to dissipate heat from the engine compartment. At this time, the temperature is lower than the temperature set by the controller, and the temperature sensor monitors and feeds back the signal to the controller. The controller outputs current to the fan valve group to control the reversal of the fan valve group, cuts off the pressure oil of the hydraulic motor, and allows the pressure oil output by the oil pump to return directly to the hydraulic oil tank. The hydraulic motor and its fan blades stop running, which can reduce unnecessary heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the engine room heat dissipation hydraulic system of the utility model;

[0023] Figure 2 It is the hydraulic principle diagram of the fan valve group of the utility model;

[0024] In the figure: 1. Hydraulic oil tank; 2. Oil pump; 3. Fan valve group; 4. Hydraulic motor; 5. Engine compartment; 6. Fan blades; 7. Temperature sensor; 3-1. Overflow valve; 3-2. Check valve; 3-3. Solenoid proportional pressure reducing valve; 3-4. Two-position four-way hydraulically controlled reversing valve.

[0025] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 As shown, an engine compartment heat dissipation hydraulic system includes a temperature sensor 7, a heat dissipation fan, a fan valve group 3, an oil pump 2, a hydraulic oil tank 1 and a controller; the temperature sensor 7 is installed in the engine compartment 5, and is used to monitor the ambient temperature of the engine compartment 5 in real time; the heat dissipation fan is installed on the side wall of the engine compartment, and the heat dissipation fan includes a hydraulic motor 4 and a fan blade 6 installed on the hydraulic motor 4, and the hydraulic motor 4 drives the fan blade 6 to rotate to dissipate heat from the engine compartment 5; the hydraulic oil tank 1 is connected to the oil inlet of the oil pump 2, wherein the oil pump 2 is a gear pump, and oil is sucked from the hydraulic oil tank 1 to provide pressure oil for the heat dissipation hydraulic system; the oil outlet of the oil pump 2 is connected to the P oil port of the fan valve group 3, and the T oil port of the fan valve group 3 The port is connected to the hydraulic oil tank 1, the A oil port and B oil port of the fan valve group 3 are connected to the hydraulic motor 4, and the Pi oil port on the fan valve group 3 is connected to the pilot hydraulic system of the vehicle; the controller is connected to the temperature sensor 7. When the cabin temperature monitored by the temperature sensor 7 is higher than the controller set temperature, the electrical signal of the temperature sensor 7 is fed back to the controller. At this time, the controller does not output a signal, and the oil pump 2 provides hydraulic oil to drive the hydraulic motor 4 and the cooling fan to dissipate heat from the engine compartment 5, thereby reducing the ambient temperature in the cabin; when the cabin temperature monitored by the temperature sensor 7 is lower than the controller set temperature, the controller outputs an electrical signal to the fan valve group 3, and the fan valve group 3 switches the circuit to cause the cooling fan to stop dissipating heat.

[0030] The above-mentioned fan valve assembly is further described below.

[0031] like Figure 2As shown, the fan valve group 3 has a total of 6 oil ports, namely P port, T port, A port, B port, Pi port and M port. The P port is the oil inlet port, connected to the oil pump; the A and B ports are the working oil ports, connected to the hydraulic motor; the T port is the oil return port, connected to the hydraulic oil tank; the Pi port is the pilot oil port, and the pipeline is connected to the vehicle's pilot hydraulic system to provide pilot pressure oil for the fan valve group; the M port is a pressure measuring port, which is convenient for the inspection and maintenance of the hydraulic system.

[0032] The fan valve group 3 includes a two-position four-way hydraulically controlled reversing valve 3-4, an electromagnetic proportional pressure reducing valve 3-3, a relief valve 3-1 and a one-way valve 3-2; the two-position four-way hydraulically controlled reversing valve 3-4 in the fan valve group 3 is initially in the lower position. After receiving an electrical signal, it will switch to the upper position working state under the push of the pilot pressure oil output by the electromagnetic proportional pressure reducing valve 3-3.

[0033] The overflow valve 3-1 limits the maximum working pressure of the system and is also a protection for the hydraulic motor 4 to prevent the hydraulic motor 4 from being damaged by excessive pressure; the one-way valve 3-2 plays the role of oil replenishment. When the hydraulic motor 4 stops, the fan blades 6 will continue to rotate for a period of time due to inertia. At this time, the oil supply and return of the hydraulic motor have been cut off, and the oil port A of the hydraulic motor 4 needs to be replenished through this one-way valve 3-2; the electromagnetic proportional pressure reducing valve 3-3 is a pilot valve for controlling the two-position four-way hydraulically controlled reversing valve 3-4. The pilot pressure is connected to the non-spring end of the two-position four-way hydraulically controlled reversing valve 3-4 through the electromagnetic proportional pressure reducing valve 3-3, pushing the valve core to overcome the spring force for reversing.

[0034] Under normal circumstances, after the engine is started, the oil pump 2 will immediately output pressurized oil. At this time, if the ambient temperature is higher than the reference value set by the controller, the controller will not output a signal, and the two-position four-way hydraulically controlled reversing valve 3-4 in the fan valve group 3 will always be in the lower position under the action of the spring force. The pressurized oil is delivered to the hydraulic motor 4 through the fan valve group 3, driving the hydraulic motor 4 to drive the fan blades 6 to rotate for heat dissipation.

[0035] If the ambient temperature is lower than the reference value set by the controller, the controller outputs an electrical signal to the electromagnetic proportional pressure reducing valve 3-3 in the fan valve group 3. The output pressure of the electromagnetic proportional pressure reducing valve 3-3 pushes the two-position four-way hydraulically controlled reversing valve 3-4 to overcome the spring force and switch to the upper working state. At this time, the pressure oil output by the oil pump 2 will pass through the P oil port of the fan valve group 3 and directly return to the hydraulic oil tank 1 from the T oil port without passing through the hydraulic motor 4. At this time, the cooling fan stops cooling.

[0036] The utility model also provides an engineering machine, comprising an engine compartment 5, on which the above-mentioned engine compartment heat dissipation hydraulic system is installed.

[0037] In a further embodiment, the construction machinery includes an excavator.

[0038] In summary, a temperature sensor and a hydraulically driven cooling fan are provided in the engine compartment, and the cabin is cooled by temperature monitoring of the hydraulically driven cooling fan and the temperature sensor and control of the controller; when the cabin temperature is higher than the temperature set by the controller, the pressure oil provided by the oil pump drives the hydraulic motor and its fan blades to rotate at high speed through the fan valve group to take away the heat in the cabin and reduce the ambient temperature in the cabin; the engine can have a better working environment temperature, which can improve the engine's working efficiency and extend the engine's service life to a certain extent.

[0039] In some low temperature environments and when the car needs to be warmed up, it is not necessary to dissipate heat from the engine compartment. At this time, the temperature is lower than the temperature set by the controller, and the monitoring feedback signal of the temperature sensor is given to the controller. The controller outputs current to the fan valve group to control the reversal of the fan valve group, cuts off the pressure oil of the hydraulic motor, and allows the pressure oil output by the oil pump to return directly to the hydraulic oil tank. The hydraulic motor and its fan blades stop running, which can reduce unnecessary heat loss.

[0040] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0041] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0042] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. An engine compartment heat dissipation hydraulic system, characterized in that: include: A temperature sensor is installed in the engine compartment to monitor the ambient temperature of the engine compartment in real time; A cooling fan installed on the side wall of the engine nacelle includes a driving component and fan blades installed on the driving component, and the driving component drives the fan blades to rotate to dissipate heat from the engine nacelle; A fan valve group, an oil pump and a hydraulic oil tank, wherein the hydraulic oil tank is connected to the oil inlet of the oil pump, the oil outlet of the oil pump is connected to the P oil port of the fan valve group, the T oil port of the fan valve group is connected to the hydraulic oil tank, the A oil port and the B oil port of the fan valve group are connected to the driving component, and the Pi oil port on the fan valve group is connected to the pilot hydraulic system of the vehicle; The controller is connected to the temperature sensor. When the cabin temperature monitored by the temperature sensor is lower than the temperature set by the controller, the controller outputs an electrical signal to the fan valve group, and the fan valve group switches the circuit to cause the cooling fan to stop cooling.

2. The engine compartment heat dissipation hydraulic system according to claim 1, characterized in that: The fan valve group includes an electromagnetic proportional pressure reducing valve and a two-position four-way hydraulically controlled reversing valve; The electromagnetic proportional pressure reducing valve is connected to the Pi oil port, and the two-position four-way hydraulically controlled reversing valve is connected to the A oil port, the B oil port, the P oil port, and the T oil port. After receiving the electrical signal output by the controller, the electromagnetic proportional pressure reducing valve outputs the pilot pressure oil to push the valve core of the two-position four-way hydraulically controlled reversing valve to perform reversing.

3. The engine compartment heat dissipation hydraulic system according to claim 2, characterized in that: The fan valve group also includes a relief valve for limiting the working pressure of the heat dissipation hydraulic system, and the relief valve is connected between the P oil port and the T oil port.

4. The engine compartment heat dissipation hydraulic system according to claim 3, characterized in that: Both ends of the overflow valve are connected in parallel with a one-way valve for replenishing oil to the cooling fan after shutdown.

5. The engine compartment heat dissipation hydraulic system according to claim 1, characterized in that: The fan valve assembly is also provided with a pressure measuring port for convenient inspection and maintenance of the heat dissipation hydraulic system.

6. The engine compartment heat dissipation hydraulic system according to claim 1, characterized in that: The driving component is a hydraulic motor. The pressure oil output by the oil pump is delivered to the hydraulic motor through the fan valve group, driving the hydraulic motor to rotate and perform heat dissipation.

7. An engineering machine, comprising an engine compartment, characterized in that: The engine nacelle is equipped with an engine nacelle heat dissipation hydraulic system according to any one of claims 1 to 6.

8. The engineering machine according to claim 7, characterized in that: The engineering machine includes an excavator.

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