Heat dissipation protection hydraulic system

Abstract

The utility model provides a heat dissipation protection hydraulic system which comprises an oil tank, a heat dissipation pump, a radiator, a filter and an overflow valve, an inlet of the heat dissipation pump is connected with an oil outlet of the oil tank, an outlet of the heat dissipation pump is connected with an inlet of the radiator through a first pipeline, and an outlet of the radiator is connected with an inlet of the filter through a second pipeline. An outlet of the filter communicates with an oil inlet of the oil tank; an inlet of the overflow valve is connected to one end of the first pipeline close to the heat dissipation pump, and an outlet of the overflow valve is connected to one end of the second pipeline close to the filter. According to the utility model, when the outlet pressure of the heat dissipation pump is large in a low-temperature environment, short-circuit overflow is carried out on the outlet of the heat dissipation pump through the overflow valve, so that overpressure of the radiator is avoided; meanwhile, the pipeline resistance of oil circulation is reduced, and the requirement for the pipeline specification of a heat dissipation pipeline is lowered; and the temperature rising speed of the hydraulic system under the low-temperature condition is increased, and the starting efficiency of the hydraulic system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor heat dissipation systems, in particular to a heat dissipation protection hydraulic system. Background Art

[0002] Currently, tractor radiators are typically installed in the engine compartment, resulting in long cooling pipes and a large footprint. Furthermore, the design of the tractor's oil cooling system takes into account the high viscosity and high pressure resistance of oil at low temperatures. To ensure that the oil inlet pressure does not exceed the radiator's tolerance limit, the cooling pipes generally use larger pipes. This allows the cooling pump to deliver only a lower pressure to drive the oil into the radiator. This structure further increases the space occupied by the cooling pipes. Moreover, at low temperatures, the hydraulic oil still flows through the radiator, resulting in very slow heating of the hydraulic system, which seriously affects the hydraulic system's starting efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to reduce the pipe specification requirements of the heat dissipation pipeline, avoid radiator overpressure, and improve the heating speed of the hydraulic system under low temperature conditions.

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

[0005] The utility model provides a heat dissipation protection hydraulic system, comprising an oil tank, a heat dissipation pump, a radiator, a filter, and a relief valve, wherein the inlet of the heat dissipation pump is connected to the oil outlet of the oil tank, the outlet of the heat dissipation pump is connected to the inlet of the radiator through a first pipeline, the outlet of the radiator is connected to the inlet of the filter through a second pipeline, and the outlet of the filter is connected to the oil inlet of the oil tank; the inlet of the relief valve is connected to one end of the first pipeline close to the heat dissipation pump, and the outlet of the relief valve is connected to one end of the second pipeline close to the filter.

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

[0007] By adopting the utility model, when the outlet pressure of the heat pump is relatively high in a low-temperature environment, the outlet of the heat pump is short-circuited and overflowed through the overflow valve, thereby avoiding overpressure in the radiator; at the same time, the pipeline resistance of the oil circulation is reduced, the pipeline specification requirements of the heat dissipation pipeline are lowered, and the space occupied by the heat dissipation pipeline is reduced; and at low temperatures, the oil does not need to flow through the radiator, thereby improving the heating speed of the hydraulic system under low-temperature conditions and improving the starting efficiency of the hydraulic system.

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

[0009] Furthermore, it also includes an oil return safety valve, the inlet of the oil return safety valve is connected to one end of the first pipeline close to the radiator, and the outlet of the oil return safety valve is connected to one end of the second pipeline close to the radiator.

[0010] When the radiator is clogged or encounters other faults that cause the inlet and outlet pressure difference of the radiator to increase, the inlet and outlet pressure difference of the radiator reaches the opening pressure of the return oil safety valve, and the return oil safety valve opens, thereby limiting the inlet and outlet pressure difference of the radiator, avoiding radiator overpressure failure, and improving safety.

[0011] Furthermore, the opening pressure of the oil return safety valve is lower than the opening pressure of the relief valve.

[0012] It is convenient to ensure that the overflow valve only works when the temperature is low and the pipeline resistance is large. The oil return safety valve can effectively restrict the inlet and outlet pressure difference of the radiator and has good reliability.

[0013] Furthermore, the opening pressure of the oil return safety valve is 4 bar.

[0014] It is suitable for the inlet and outlet pressure difference of radiators commonly used in tractors and has good adaptability.

[0015] Furthermore, the opening pressure of the overflow valve is 20 bar.

[0016] When the outlet pressure of the cooling pump reaches 20 bar, the oil of the cooling pump directly passes through the overflow valve to the filter, which not only limits the oil inlet pressure of the radiator, but also allows the low-temperature oil to pass through the radiator without passing through the radiator, thereby improving the temperature rise and activation speed of the hydraulic system.

[0017] Furthermore, it also includes a bypass valve, which is connected in parallel with the filter.

[0018] When impurities accumulate in the filter, the inlet and outlet pressure difference of the filter increases. When the pressure difference reaches the opening pressure of the bypass valve, the bypass valve opens and allows the oil to enter the oil tank directly, avoiding overpressure failure of the filter and improving safety.

[0019] Furthermore, it also includes a flood prevention alarm, which is connected in parallel with the bypass valve.

[0020] When the pressure difference between the inlet and outlet of the filter increases to the alarm pressure of the flood alarm, the flood alarm will sound, reminding the user to replace the filter in time to ensure the oil filtration effect.

[0021] Furthermore, the alarm pressure of the flood control alarm is lower than the opening pressure of the bypass valve.

[0022] It is convenient to remind the user to replace the filter in time when the inlet and outlet pressure difference of the filter increases; when the user does not replace the filter, the inlet and outlet pressure difference of the filter continues to increase until it reaches the opening pressure of the bypass valve. The bypass valve opens to allow the oil to directly enter the oil tank, which is safe and reliable.

[0023] Furthermore, the opening pressure of the bypass valve is 6 bar.

[0024] It is suitable for the maximum pressure of filters commonly used in tractors, ensuring the oil filtration effect and avoiding overpressure failure of the filter housing.

[0025] Furthermore, at least two filters are provided and connected in parallel.

[0026] It is convenient to increase the processing volume and improve the oil filtration efficiency. 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-Oil tank; 2-Cooling pump; 3-Radiator; 4-Filter; 5-Overflow valve; 6-First pipeline; 7-Second pipeline; 8-Oil return safety valve; 9-Bypass valve; 10-Flood alarm. 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 a heat dissipation protection hydraulic system, which includes an oil tank 1, a heat dissipation pump 2, a radiator 3, a filter 4, and a relief valve 5. The inlet of the heat dissipation pump 2 is connected to the oil outlet of the oil tank 1, the outlet of the heat dissipation pump 2 is connected to the inlet of the radiator 3 through a first pipeline 6, the outlet of the radiator 3 is connected to the inlet of the filter 4 through a second pipeline 7, and the outlet of the filter 4 is connected to the oil inlet of the oil tank 1; the inlet of the relief valve 5 is connected to one end of the first pipeline 6 close to the heat dissipation pump 2, and the outlet of the relief valve 5 is connected to one end of the second pipeline 7 close to the filter 4.

[0033] principle:

[0034] During normal operation, heat pump 2 draws oil from tank 1 and pressurizes it to radiator 3. After cooling, the oil is filtered through filter 4 and returned to tank 1. The clean, cooled, and filtered oil can be used by other hydraulic components (such as the travel pump, cylinder, and motor). At low temperatures, the oil's viscosity is high, requiring heat pump 2 to output a higher pressure to overcome pipeline resistance. When the outlet pressure of heat pump 2 exceeds the opening pressure of relief valve 5, the pipeline in which relief valve 5 is located is short. When relief valve 5 is open, the pipeline resistance is much smaller than the resistance at the end of the first branch near radiator 3. The pressure at this end of the first branch near radiator 3 is very low, allowing the oil to flow directly through relief valve 5 into filter 4, preventing overpressure at the inlet of radiator 3. Since the output pressure of heat pump 2 does not affect the safety of radiator 3, smaller-sized pipes can be used for both first and second pipes 6 and 7. This significantly reduces the space occupied by the heat dissipation pipeline in long applications. In addition, since the oil does not need to flow through the radiator 3 at low temperatures, the heat accumulation speed of the oil is accelerated, and the heating speed of the hydraulic system in low temperature environments is improved.

[0035] By adopting the utility model, when the outlet pressure of the heat pump 2 is relatively high under low temperature conditions, the outlet of the heat pump 2 is short-circuited and overflowed through the overflow valve 5, thereby avoiding overpressure of the radiator 3; at the same time, the pipeline resistance of the oil circulation is reduced, the pipeline specification requirements of the heat dissipation pipeline are lowered, and the space occupied by the heat dissipation pipeline is reduced; and at low temperatures, the oil does not need to flow through the radiator 3, thereby improving the heating speed of the hydraulic system under low temperature conditions and improving the starting efficiency of the hydraulic system.

[0036] Furthermore, it includes an oil return safety valve 8 , the inlet of the oil return safety valve 8 is connected to one end of the first pipeline 6 close to the radiator 3 , and the outlet of the oil return safety valve 8 is connected to one end of the second pipeline 7 close to the radiator 3 .

[0037] Note: Because first and second pipelines 6 and 7 are very long and constitute the main portion of the heat dissipation pipeline, the inlet and outlet of oil return safety valve 8 can be connected near radiator 3. The distance between oil return safety valve 8 and radiator 3 is negligible compared to the length of first and second pipelines 6 and 7, and it can be considered the end of first and second pipelines 6 and 7. Similarly, the inlet of relief valve 5 can be connected near heat pump 2, and the outlet of relief valve 5 can be connected near filter 4.

[0038] When the radiator 3 is blocked or encounters other faults that cause the inlet and outlet pressure difference of the radiator 3 to increase, the inlet and outlet pressure difference of the radiator 3 reaches the opening pressure of the return oil safety valve 8, and the return oil safety valve 8 opens, thereby limiting the inlet and outlet pressure difference of the radiator 3, avoiding overpressure failure of the radiator 3, and improving safety.

[0039] Furthermore, the opening pressure of the oil return safety valve 8 is lower than the opening pressure of the relief valve 5 .

[0040] It is convenient to ensure that the overflow valve 5 only works when the temperature is low and the pipeline resistance is large. The oil return safety valve 8 can effectively restrict the inlet and outlet pressure difference of the radiator 3 and has good reliability.

[0041] Furthermore, the opening pressure of the oil return safety valve 8 is 4 bar.

[0042] It is suitable for the inlet and outlet pressure difference of the radiator 3 commonly used in tractors and has good adaptability.

[0043] Furthermore, the opening pressure of the overflow valve 5 is 20 bar.

[0044] When the outlet pressure of the heat pump 2 reaches 20 bar, the oil of the heat pump 2 directly passes through the overflow valve 5 to the filter 4, which not only limits the oil inlet pressure of the radiator 3, but also allows the low-temperature oil to not pass through the radiator 3, thereby improving the temperature rise and activation speed of the hydraulic system.

[0045] Furthermore, a bypass valve 9 is included, and the bypass valve 9 is connected in parallel with the filter 4 .

[0046] Note: Bypass valve 9, relief valve 5 and oil return safety valve 8 can all be one-way valves.

[0047] When impurities accumulate in the filter 4, the inlet and outlet pressure difference of the filter 4 increases. When the pressure difference reaches the opening pressure of the bypass valve 9, the bypass valve 9 opens to allow the oil to directly enter the oil tank 1, avoiding overpressure failure of the filter 4 and improving safety.

[0048] Furthermore, a flood prevention alarm 10 is included, and the flood prevention alarm 10 is connected in parallel with the bypass valve 9 .

[0049] When the inlet and outlet pressure difference of the filter 4 increases to the alarm pressure of the flood alarm 10, the flood alarm 10 will alarm, so as to remind the user to replace the filter 4 in time and ensure the oil filtering effect.

[0050] Furthermore, the alarm pressure of the flood control alarm 10 is lower than the opening pressure of the bypass valve 9 .

[0051] It is convenient to remind the user to replace the filter 4 in time when the inlet and outlet pressure difference of the filter 4 increases; when the user does not replace the filter 4, the inlet and outlet pressure difference of the filter 4 continues to increase until it reaches the opening pressure of the bypass valve 9. The bypass valve 9 opens to allow the oil to directly enter the oil tank 1, which has good safety and reliability.

[0052] Furthermore, the opening pressure of the bypass valve 9 is 6 bar.

[0053] It is suitable for the maximum pressure of the filter 4 commonly used in tractors, ensures the oil filtering effect, and avoids the overpressure failure of the filter 4 shell.

[0054] Furthermore, at least two filters 4 are provided and connected in parallel.

[0055] It is convenient to increase the processing volume and improve the oil filtration efficiency.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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. A heat dissipation protection hydraulic system, characterized by: The invention comprises an oil tank (1), a heat dissipation pump (2), a radiator (3), a filter (4), and a relief valve (5); the inlet of the heat dissipation pump (2) is connected to the oil outlet of the oil tank (1); the outlet of the heat dissipation pump (2) is connected to the inlet of the radiator (3) through a first pipeline (6); the outlet of the radiator (3) is connected to the inlet of the filter (4) through a second pipeline (7); the outlet of the filter (4) is connected to the oil inlet of the oil tank (1); the inlet of the relief valve (5) is connected to one end of the first pipeline (6) close to the heat dissipation pump (2); and the outlet of the relief valve (5) is connected to one end of the second pipeline (7) close to the filter (4).

2. The heat dissipation protection hydraulic system according to claim 1, characterized in that: The oil return safety valve (8) is also included. The inlet of the oil return safety valve (8) is connected to one end of the first pipeline (6) close to the radiator (3), and the outlet of the oil return safety valve (8) is connected to one end of the second pipeline (7) close to the radiator (3).

3. The heat dissipation protection hydraulic system according to claim 2, characterized in that: The opening pressure of the oil return safety valve (8) is lower than the opening pressure of the overflow valve (5).

4. The heat dissipation protection hydraulic system according to claim 3, characterized in that: The opening pressure of the oil return safety valve (8) is 4 bar.

5. The heat dissipation protection hydraulic system according to claim 3, characterized in that: The opening pressure of the overflow valve (5) is 20 bar.

6. The heat dissipation protection hydraulic system according to claim 1, characterized in that: It also includes a bypass valve (9), which is connected in parallel with the filter (4).

7. The heat dissipation protection hydraulic system according to claim 6, characterized in that: It also includes a flood prevention alarm (10), which is connected in parallel with the bypass valve (9).

8. The heat dissipation protection hydraulic system according to claim 7, characterized in that: The alarm pressure of the flood prevention alarm (10) is lower than the opening pressure of the bypass valve (9).

9. The heat dissipation protection hydraulic system according to claim 8, characterized in that: The opening pressure of the bypass valve (9) is 6 bar.

10. The heat dissipation protection hydraulic system according to claim 6, characterized in that: At least two filters (4) are provided and connected in parallel.

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