Oil liquid heat dissipation hydraulic system

Abstract

The utility model provides an oil liquid heat dissipation hydraulic system which comprises a variable pump and a reversing valve, an outlet of the variable pump is respectively connected with a heat dissipation motor and a first throttling element through branches, and the outlet end of the first throttling element is connected with a resistance variable element; the two ends of a valve element of the reversing valve are in loop connection with the first throttling element, a pressure oil port of the reversing valve is connected to an oil way from the variable pump to the first throttling element, a working oil port of the reversing valve is connected with the control end of the variable pump, and an oil return port of the reversing valve is connected with an oil return pipeline. According to the variable pump, the pressure difference between the two ends of the first throttling element is controlled through the resistance variable element, the position of the valve element of the reversing valve is controlled through the pressure difference between the two ends of the first throttling element, and therefore the oil flow direction of the working oil port of the reversing valve and the oil flow direction of the control end of the variable pump are controlled, and control over the oil output amount of the variable pump is achieved; the power of the heat dissipation motor is convenient to adjust, the oil temperature is accurately adjusted, and energy waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation systems, and in particular to an oil heat dissipation hydraulic system. Background Art

[0002] Currently, most hydraulic oil cooling systems are fixed-flow systems. This involves a fixed-flow pump driving a hydraulic motor, which in turn rotates a radiator fan. The fan faces the radiator, allowing air to flow through the radiator's gaps, removing heat and dissipating the hydraulic oil. This inability to adjust the amount of heat dissipated to meet changing demand results in low cooling system efficiency, an inability to precisely regulate oil temperature, and high energy consumption. Utility Model Content

[0003] The technical problem to be solved by the present invention is: how to adjust the heat dissipation power as the heat dissipation demand changes, accurately adjust the oil temperature, and reduce energy consumption.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] The utility model provides an oil heat dissipation hydraulic system, comprising a variable pump and a reversing valve, wherein the outlet of the variable pump is respectively connected to a heat dissipation motor and a first throttling element through a branch, and the outlet end of the first throttling element is connected to a variable resistance element; the two ends of the valve core of the reversing valve form a loop connection with the first throttling element, the pressure oil port of the reversing valve is connected to the oil path from the variable pump to the first throttling element, the working oil port of the reversing valve is connected to the control end of the variable pump, and the return oil port of the reversing valve is connected to the return oil pipeline.

[0006] The beneficial effects of the utility model are:

[0007] By adopting the utility model, the pressure difference at both ends of the first throttling element is controlled by the variable resistance element, and the valve core position of the reversing valve is controlled by the pressure difference at both ends of the first throttling element, thereby controlling the oil flow direction between the working oil port of the reversing valve and the control end of the variable pump, thereby realizing the control of the oil output amount of the variable pump; according to the change of heat dissipation demand, the power of the heat dissipation motor is adjusted by controlling the oil output amount of the variable pump, thereby accurately adjusting the oil temperature and reducing energy waste.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, it also includes a second throttling element, one end of which is connected to the oil path from the working oil port of the reversing valve to the variable pump, and the other end of the second throttling element is connected to the return oil pipeline.

[0010] When the spool of the reversing valve is in the working position, the oil flowing out of the working oil port of the reversing valve enters the control end of the variable pump. At the same time, part of the oil flows from the second throttling element to the return oil pipeline. Finally, the flow of the second throttling element and its own resistance are balanced, and the flow of the reversing valve and its own resistance are balanced. The oil volume and pressure from the working oil port of the reversing valve to the control end of the variable pump are stable, so that the variable pump has stable output. It is easy to control the variable pump to achieve stability at any output oil volume, and there is no need to frequently operate the variable resistance element to achieve balance, which greatly improves convenience and extends service life.

[0011] Furthermore, the first throttling element and the second throttling element are both throttling holes.

[0012] The structure is simple, the manufacturing cost is low and the assembly is convenient.

[0013] Furthermore, the variable displacement pump is a swash plate variable displacement pump, and the control end of the variable displacement pump is an oil cylinder.

[0014] When the oil volume from the working oil port of the reversing valve to the oil cylinder increases, the oil cylinder extends to push the swash plate of the variable pump to move, thereby increasing the output oil volume of the variable pump, which is easy to control and has good reliability.

[0015] Furthermore, the cylinder body end of the oil cylinder is connected to the working oil port of the reversing valve, and a return spring is sleeved on the piston rod of the oil cylinder.

[0016] The elastic force of the return spring can achieve a balance with the oil pressure at the cylinder end of the cylinder, thereby maintaining the extended length of the cylinder and making the output oil volume of the variable pump stable; when the valve core of the reversing valve is in the oil return position, the elastic force of the return spring can push the cylinder to retract, allowing the oil in the cylinder to return.

[0017] Furthermore, the valve core of the reversing valve is provided with a working position and an oil return position. When the working position of the valve core is working, the pressure oil port of the reversing valve is connected with the working oil port; when the return oil position of the valve core is working, the working oil port of the reversing valve is connected with the oil return port.

[0018] Simple structure, low cost and easy control.

[0019] Furthermore, a return spring is provided in the reversing valve, one end of which abuts against the end of the valve core at the oil return position; when the valve core is in the working position, the return spring is in a compressed state.

[0020] When the pressure difference at both ends of the valve core is less than the elastic force of the return spring, the elastic force of the return spring pushes the valve core to the oil return position to work, which is convenient for ensuring that the reversing valve normally works at the oil return position and has good reliability.

[0021] Furthermore, the variable resistance element is an electromagnetic proportional overflow valve.

[0022] Easy to control, the electromagnetic proportional relief valve can be controlled by the engine's ECU, making it easy to achieve automation.

[0023] Furthermore, it also includes a one-way valve, the outlet of the one-way valve is connected to the oil inlet of the heat dissipation motor, and the inlet of the one-way valve is connected to the oil outlet of the heat dissipation motor.

[0024] When the vehicle stops and the variable pump cuts off the oil supply, part of the oil at the outlet of the cooling motor can flow back to the inlet of the cooling motor through the one-way valve, so that the cooling motor can stop slowly under the action of inertia, avoiding the cooling motor from being subjected to excessive impact force due to sudden stop.

[0025] Furthermore, it also includes an oil tank; the inlet of the variable pump, the oil outlet of the heat dissipation motor, the outlet end of the variable resistance element and the oil return pipeline are all connected to the oil tank.

[0026] It is convenient to realize oil circulation, with clear pipeline layout and easy assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the present utility model.

[0028] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0029] 1-Variable pump; 2-Cooling motor; 3-First throttling element; 4-Variable resistance element; 5-Reversing valve; 6-Second throttling element; 7-Cylinder; 8-Return spring; 9-Return spring; 10-Check valve; 11-Cooling fan; 12-Oil tank. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] This utility model refers to Figure 1 .

[0032] The utility model provides an oil heat dissipation hydraulic system, comprising a variable pump 1 and a reversing valve 5. The outlet of the variable pump 1 is respectively connected to a heat dissipation motor 2 and a first throttling element 3 through a branch, and the outlet end of the first throttling element 3 is connected to a variable resistance element 4; both ends of the valve core of the reversing valve 5 form a loop connection with the first throttling element 3, the pressure oil port of the reversing valve 5 is connected to the oil path from the variable pump 1 to the first throttling element 3, the working oil port of the reversing valve 5 is connected to the control end of the variable pump 1, and the return oil port of the reversing valve 5 is connected to the return oil pipeline.

[0033] principle:

[0034] During normal cooling, variable displacement pump 1 supplies oil to cooling motor 2, which drives cooling fan 11, providing airflow to the radiator. Simultaneously, in another branch, first throttle element 3 and variable resistance element 4 are connected in series. As long as the resistance of variable resistance element 4 remains constant, the pressure across first throttle element 3 remains constant.

[0035] When the need for heat dissipation increases, the resistance of variable resistance element 4 is reduced, reducing the pressure at the outlet of first throttling element 3 (left end in the figure). This increases the pressure differential across first throttling element 3, pushing the spool of reversing valve 5 to its working position (upward in the figure), connecting the passage from the pressure oil port of reversing valve 5 to the working oil port. The oil flowing out of the working oil port of reversing valve 5 enters the control end of variable pump 1, thereby controlling variable pump 1 to increase its output oil volume. As the oil volume of heat dissipation motor 2 increases, its power increases, and the heat dissipation air volume increases.

[0036] When the heat dissipation demand decreases, the resistance of the variable resistance element 4 can be increased, increasing the pressure at the outlet of the first throttling element 3 (the left end in the figure). The pressure difference across the first throttling element 3 decreases, and the valve core of the reversing valve 5 moves to the oil return position (downward in the figure) due to its self-reset characteristic, connecting the passage from the working oil port of the reversing valve 5 to the oil return port. The oil at the control end of the variable pump 1 flows back through the reversing valve 5 to the oil return line, thereby controlling the variable pump 1 to reduce its output oil volume. As the oil volume of the heat dissipation motor 2 decreases, its power decreases, and the heat dissipation air volume decreases.

[0037] Note: The variable resistance element 4 can be a relief valve, a manual valve, etc. The variable pump 1 is generally a hydraulic feedback pump. When the feedback hydraulic pressure increases, the output oil volume increases. It is a prior art product.

[0038] With the present invention, the pressure difference at both ends of the first throttling element 3 is controlled by the variable resistance element 4, and the valve core position of the reversing valve 5 is controlled by the pressure difference at both ends of the first throttling element 3, thereby controlling the oil flow direction between the working oil port of the reversing valve 5 and the control end of the variable pump 1, thereby realizing the control of the oil output amount of the variable pump 1; according to the change of heat dissipation demand, the power of the heat dissipation motor 2 is adjusted by controlling the oil output amount of the variable pump 1, thereby accurately adjusting the oil temperature and reducing energy waste.

[0039] Furthermore, it also includes a second throttling element 6, one end of which is connected to the oil path from the working oil port of the reversing valve 5 to the variable pump 1, and the other end of the second throttling element 6 is connected to the return oil pipeline.

[0040] Note: When the valve core of the reversing valve 5 is in the working position, a slight change in the pressure at both ends of the valve core can control the valve core to move a small amount, thereby changing the channel size and pressure drop from the pressure oil port to the working oil port.

[0041] When the valve core of the reversing valve 5 is in the working position, the oil flowing out of the working oil port of the reversing valve 5 enters the control end of the variable pump 1, and at the same time, part of the oil flows from the second throttling element 6 to the return oil pipeline. Finally, the flow of the second throttling element 6 and its own resistance are balanced, and the flow of the reversing valve 5 and its own resistance are balanced. The oil volume and pressure from the working oil port of the reversing valve 5 to the control end of the variable pump 1 are stable, so that the variable pump 1 has a stable output. It is convenient to control the variable pump 1 to achieve stability at any output oil volume, and there is no need to frequently operate the variable resistance element 4 to achieve balance, which greatly improves convenience and extends service life.

[0042] Furthermore, the first throttling element 3 and the second throttling element 6 are both throttling holes.

[0043] The structure is simple, the manufacturing cost is low and the assembly is convenient.

[0044] Furthermore, the variable displacement pump 1 is a swash plate variable displacement pump, and the control end of the variable displacement pump 1 is the oil cylinder 7 .

[0045] When the oil volume from the working oil port of the reversing valve 5 to the oil cylinder 7 increases, the oil cylinder 7 extends to push the swash plate of the variable pump 1 to move, thereby increasing the output oil volume of the variable pump 1, which is easy to control and has good reliability.

[0046] Furthermore, the cylinder end of the oil cylinder 7 is connected to the working oil port of the reversing valve 5, and a return spring 8 is sleeved on the piston rod of the oil cylinder 7.

[0047] The elastic force of the return spring 8 can achieve a balance with the oil pressure at the cylinder end of the oil cylinder 7, thereby maintaining the extended length of the oil cylinder 7 and making the output oil volume of the variable pump 1 stable; when the valve core of the reversing valve 5 is in the oil return position, the elastic force of the return spring 8 can push the oil cylinder 7 to retract, allowing the oil in the oil cylinder 7 to return.

[0048] Furthermore, the valve core of the reversing valve 5 is provided with a working position and an oil return position. When the working position of the valve core is working, the pressure oil port of the reversing valve 5 is connected with the working oil port; when the return oil position of the valve core is working, the working oil port of the reversing valve 5 is connected with the oil return port.

[0049] Note: The working position and the return oil position are provided with different channels. The pressure oil port is connected with the working oil port through the channel of the working position, and the working oil port is connected with the return oil port through the channel of the return oil position. The pressure difference at both ends of the valve core pushes the valve core to move, thereby making the working position or the return oil position work.

[0050] Simple structure, low cost and easy control.

[0051] Furthermore, a return spring 9 is provided in the reversing valve 5 , one end of which abuts against the end of the valve core at the oil return position; when the valve core is in the working position, the return spring 9 is in a compressed state.

[0052] When the pressure difference at both ends of the valve core is less than the elastic force of the return spring 9, the elastic force of the return spring 9 pushes the valve core to the oil return position, which is convenient for ensuring that the reversing valve 5 works at the oil return position normally and has good reliability.

[0053] Furthermore, the variable resistance element 4 is an electromagnetic proportional overflow valve.

[0054] Easy to control, the electromagnetic proportional relief valve can be controlled by the engine's ECU, making it easy to achieve automation.

[0055] Furthermore, a one-way valve 10 is included, the outlet of the one-way valve 10 is connected to the oil inlet of the heat dissipation motor 2 , and the inlet of the one-way valve 10 is connected to the oil outlet of the heat dissipation motor 2 .

[0056] When the car is parked and the variable pump 1 cuts off the oil supply, part of the oil at the outlet of the cooling motor 2 can flow back to the inlet of the cooling motor 2 through the one-way valve 10, so that the cooling motor 2 can slowly stop under the action of inertia, avoiding the cooling motor 2 from suddenly stopping and being subjected to excessive impact force.

[0057] Furthermore, it also includes an oil tank 12; the inlet of the variable pump 1, the oil outlet of the heat dissipation motor 2, the outlet end of the variable resistance element 4 and the oil return pipeline are all connected to the oil tank 12.

[0058] It is convenient to realize oil circulation, with clear pipeline layout and easy assembly.

[0059] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In addition, if there are order description terms, such as "first", "second", etc., their use in this specification is to facilitate understanding or simplify the description. For example, in order to distinguish multiple technical features with the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of such features. In the description of this utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, if terms describing the relative functional relationship of structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be fixed connections, detachable connections, or integrated; can be mechanical connections or electrical connections; can be direct connections or indirect connections through an intermediate medium, can be internal connections between two elements or interactive relationships between two elements; "fix" can be fixed to form an integral body, or can be detachably fixed through fasteners; can be directly fixed or fixed through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the preceding and following texts, etc.

[0062] In this utility model, if descriptive terms with ancillary or connecting meaning appear, for example, a first feature being "on" or "below" a second feature, these should not be interpreted as limiting unless otherwise expressly specified or limited. For example, "on" or "below" may refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediary. Those skilled in the art will understand the specific meanings of these descriptive terms in this utility model based on the specific circumstances, context, and coherence of the preceding and following texts.

[0063] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of different embodiments and examples described in this specification, unless there is any contradiction, and these combinations or combinations should all fall within the scope summarized by the present invention.

[0065] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in the field within the scope of information available from public channels and in combination with the technical inspiration given by the application documents are still within the scope of protection of the present application.

Claims

1. An oil heat dissipation hydraulic system, characterized by: The invention comprises a variable pump (1) and a reversing valve (5); the outlet of the variable pump (1) is respectively connected to a heat dissipation motor (2) and a first throttling element (3) through a branch; the outlet end of the first throttling element (3) is connected to a variable resistance element (4); the two ends of the valve core of the reversing valve (5) form a loop connection with the first throttling element (3); the pressure oil port of the reversing valve (5) is connected to the oil path from the variable pump (1) to the first throttling element (3); the working oil port of the reversing valve (5) is connected to the control end of the variable pump (1); and the return oil port of the reversing valve (5) is connected to the return oil pipeline.

2. The oil heat dissipation hydraulic system according to claim 1, characterized in that: It also includes a second throttling element (6), one end of which is connected to the oil path from the working oil port of the reversing valve (5) to the variable pump (1), and the other end of which is connected to the return oil pipeline.

3. The oil heat dissipation hydraulic system according to claim 2, characterized in that: The first throttling element (3) and the second throttling element (6) are both throttling holes.

4. The oil heat dissipation hydraulic system according to claim 1, characterized in that: The variable pump (1) is a swash plate variable pump, and the control end of the variable pump (1) is an oil cylinder (7).

5. The oil heat dissipation hydraulic system according to claim 4, characterized in that: The cylinder body end of the oil cylinder (7) is connected to the working oil port of the reversing valve (5), and a return spring (8) is sleeved on the piston rod of the oil cylinder (7).

6. The oil heat dissipation hydraulic system according to claim 1, characterized in that: The valve core of the reversing valve (5) is provided with a working position and an oil return position. When the working position of the valve core is working, the pressure oil port of the reversing valve (5) is connected to the working oil port; when the oil return position of the valve core is working, the working oil port of the reversing valve (5) is connected to the oil return port.

7. The oil heat dissipation hydraulic system according to claim 6, characterized in that: A return spring (9) is provided in the reversing valve (5), one end of which abuts against the end of the valve core at the oil return position; when the valve core is in the working position, the return spring (9) is in a compressed state.

8. The oil heat dissipation hydraulic system according to claim 1, characterized in that: The variable resistance element (4) is an electromagnetic proportional overflow valve.

9. The oil heat dissipation hydraulic system according to claim 1, characterized in that: It also includes a one-way valve (10), the outlet of the one-way valve (10) is connected to the oil inlet of the heat dissipation motor (2), and the inlet of the one-way valve (10) is connected to the oil outlet of the heat dissipation motor (2).

10. The oil heat dissipation hydraulic system according to claim 1, characterized in that: It also includes an oil tank (12); the inlet of the variable pump (1), the oil outlet of the heat dissipation motor (2), the outlet end of the variable resistance element (4) and the oil return pipeline are all connected to the oil tank (12).

Images