A flow control oil circuit system for a heat exchanger of a retarder and a retarder

Abstract

The present invention relates to the technical field of retarders, and specifically, to a heat exchanger flow control oil circuit system and a retarder for a retarder. The system includes a first oil circuit and a first branch; wherein, the first oil circuit includes a retarder, a heat exchanger, and an oil tank that are connected in series in sequence from start to end; the first branch is connected in parallel with the heat exchanger, and an overflow valve is provided on the first branch. When the system is operating normally, the overflow valve is closed, and the oil flows along the first oil circuit in a cycle; when the output flow of the retarder exceeds the flow that the heat exchanger can withstand, the system pressure rises to a set value, the overflow valve opens, and the oil overflows to the oil tank through the overflow valve, preventing the oil flow into the heat exchanger from exceeding the flow that the heat exchanger can withstand, thereby avoiding damage to the heat exchanger due to excessive flow resistance, improving the service life of the heat exchanger, ensuring the safety and reliability of the oil circuit system, and the heat exchanger flow control oil circuit system of this retarder has a simple structure, low cost, and high practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of retarders, and in particular to a heat exchanger flow control oil circuit system and a retarder for a retarder. Background Art

[0002] A hydraulic retarder is an auxiliary braking device for motor vehicles. In essence, it is a rotary damping device that uses a rotor to drive oil to impact with a stator to generate a reverse torque, converting the kinetic energy of the vehicle into the heat energy of the oil, thereby decelerating the vehicle. The oil of the retarder, driven by the rotor, enters the heat exchanger through the oil outlet of the retarder for oil-water heat exchange, so that the heat energy of the oil is taken away by the cooling water from the engine cooling system through the heat exchanger. The oil flow output by the retarder changes with the speed of the retarder. When the retarder reaches a certain speed, the oil flow will exceed the flow rate that the heat exchanger can withstand, resulting in damage to the heat exchanger due to excessive flow resistance. If the pressure resistance of the heat exchanger is increased, a lot of costs will be incurred. Therefore, how to limit or control the oil flow into the heat exchanger at low cost is an important problem to be solved at present. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat exchanger flow control oil circuit system for a retarder, which can control the oil flow into the heat exchanger and prevent the flow rate into the heat exchanger from exceeding the flow rate that the heat exchanger can withstand; and the system has a simple structure, low cost and high practicability.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A heat exchanger flow control oil circuit system for a retarder, comprising:

[0006] A first oil circuit, the first oil circuit includes a retarder, a heat exchanger and a fuel tank that are connected in sequence and connected end to end;

[0007] A first branch, the first branch is connected in parallel with the heat exchanger; an overflow valve is provided on the first branch.

[0008] Further, the overflow valve is set as a pilot-operated overflow valve.

[0009] Further, the first oil circuit further includes a pressure reducing valve, the inlet of the pressure reducing valve is connected to the outlet of the retarder, and the outlet of the pressure reducing valve is connected to the inlet of the heat exchanger; the pressure reducing valve and the heat exchanger form an oil pipeline, and the oil pipeline is connected in parallel with the first branch.

[0010] Further, a flow control valve is provided on the oil pipeline, the inlet of the flow control valve is connected to the outlet of the pressure reducing valve, and the outlet of the flow control valve is connected to the inlet of the heat exchanger.

[0011] Further, the flow control valve is set as a flow limiting valve.

[0012] Further, the first oil path further includes a flow limiting orifice, and the flow limiting orifice is arranged at the outlet of the retarder.

[0013] Further, the fuel tank is set as an expansion fuel tank.

[0014] Further, the fuel tank is connected to the atmosphere.

[0015] Further, a one-way valve is arranged between the fuel tank and the atmosphere, and the outlet of the one-way valve faces the fuel tank.

[0016] Another object of the present invention is to provide a retarder, including the heat exchanger flow control oil path system of the retarder as described above.

[0017] Advantages of the present invention:

[0018] The present invention provides a heat exchanger flow control oil path system and a retarder of a retarder. The system includes a first oil path and a first branch; wherein, the first oil path includes a retarder, a heat exchanger and a fuel tank which are connected in sequence and connected end to end; the first branch is connected in parallel with the heat exchanger, and a relief valve is arranged on the first branch. When the system works normally, the relief valve is closed, and the oil flows along the first oil path in a cycle; when the output flow of the retarder exceeds the flow that the heat exchanger can bear, as the speed of the retarder increases, the system pressure also rises to the set value, and the relief valve opens, and the oil overflows to the fuel tank through the relief valve, avoiding the flow of the oil flowing into the heat exchanger exceeding the flow that the heat exchanger can bear, thereby avoiding the damage of the heat exchanger due to excessive flow resistance, improving the service life of the heat exchanger, ensuring the safety and reliability of the oil path system, and the system has a simple structure, low cost and high practicability. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the heat exchanger flow control oil path system of the retarder provided in Embodiment 1 of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the heat exchanger flow control oil path system of the retarder provided in Embodiment 2 of the present invention;

[0022] Figure 3 This is a schematic structural diagram of the heat exchanger flow control oil circuit system of the retarder provided in the third embodiment of the present invention.

[0023] Icon:

[0024] 1 - First oil circuit; 11 - Oil pipeline; 2 - Retarder; 21 - Working chamber; 3 - Heat exchanger; 4 - Fuel tank; 5 - First branch; 6 - Relief valve; 7 - Pressure reducing valve; 8 - Flow control valve; 9 - Restriction orifice; 10 - Check valve. Specific embodiments

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] It should be noted that in the description of the present invention, the terms "connection" and "installation" 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 directly connected, or connected through an intermediate medium; it can be a mechanical connection, or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] Refer to Figure 1, the present invention provides a flow control oil circuit system for a heat exchanger of a retarder, which includes a first oil circuit 1 and a first branch 5; wherein, the first oil circuit 1 includes a retarder 2, a heat exchanger 3 and an oil tank 4 that are connected in sequence and end to end; the first branch 5 is connected in parallel with the heat exchanger 3, and a relief valve 6 is provided on the first branch 5. The heat exchanger 3 is connected to the vehicle cooling system. When the retarder is working normally, the flow path of the oil fluid is as shown in the first oil circuit 1. At this time, the system pressure is below the set value, the output flow of the retarder 2 does not exceed the flow that the heat exchanger 3 can withstand, and the relief valve 6 is in the closed state; the oil fluid in the working chamber 21 of the retarder 2 is driven by the rotor, enters the heat exchanger 3 through the oil outlet of the retarder 2, and exchanges heat between oil and water through the vehicle cooling system; then, the cooled oil fluid flows out from the oil outlet of the heat exchanger 3, flows through the oil tank 4, and flows back from the oil inlet of the retarder 2. The above process enables the heat energy of the oil fluid to be taken away by the cooling water from the vehicle cooling system through the heat exchanger by means of heat exchange. As the speed of the retarder 2 increases, when the output flow of the retarder 2 exceeds the flow that the heat exchanger 3 can withstand, at this time, the system pressure also rises to the set value as the speed of the retarder 2 increases, and the relief valve 6 opens; the oil fluid flowing out from the oil outlet of the retarder 2 overflows to the oil tank 4 through the relief valve 6, thus preventing the flow of oil fluid into the heat exchanger 3 from exceeding the flow that the heat exchanger 3 can withstand, and further preventing the heat exchanger 3 from being damaged due to excessive flow resistance; at the same time, it also keeps the system pressure in a stable state. The flow control oil circuit system for the heat exchanger of the retarder provided in this embodiment can control the flow rate entering the heat exchanger 3, prevent the flow rate entering the heat exchanger 3 from exceeding the flow that the heat exchanger 3 can withstand, thereby avoiding damage to the heat exchanger 3, improving the service life of the heat exchanger 3, and at the same time ensuring the safety and reliability of the oil circuit system. Moreover, the system has a simple structure, low cost, and high practicality.

[0030] Optionally, the relief valve 6 is set as a pilot-operated relief valve. Compared with a direct-acting relief valve, the pilot-operated relief valve has more stable pressure, better opening and closing characteristics, and less pressure loss; and when it is inconvenient to directly operate the relief valve 6, by using a pilot-operated relief valve, a pressure regulating valve can be connected beside its remote control port to achieve remote pressure regulation.

[0031] Optionally, the first oil circuit 1 further includes a flow-limiting orifice 9, and the flow-limiting orifice 9 is arranged at the outlet of the retarder 2. The flow-limiting orifice 9 is specifically set as an electronically controlled flow-limiting orifice. By adjusting the opening of the flow-limiting orifice 9, the size of the outlet of the retarder 2 is adjusted, and then the pressure in the working chamber 21 of the retarder 2 is adjusted, so as to control the size of the retardation braking force; at the same time, the pressure of the oil circuit system is also adjusted.

[0032] Optionally, the oil tank 4 is set as an expansion tank. During the circulation process of the oil fluid, it will expand to a certain extent under heat. The expansion tank reserves an expansion space, which can ensure the safety of the oil circuit during the circulation process.

[0033] Optionally, the fuel tank 4 is connected to the atmosphere; a one-way valve 10 is provided between the fuel tank 4 and the atmosphere, and the outlet of the one-way valve 10 faces the fuel tank 4. The above settings keep the pressure in the fuel tank 4 in a stable state.

[0034] In this embodiment, the heat exchanger 3 is specifically configured as a plate heat exchanger. The plate heat exchanger has a high heat transfer coefficient, a compact structure, and a small floor area.

[0035] Embodiment Two

[0036] Referring to Figure 2 , the heat exchanger flow control oil circuit system of the retarder provided in this embodiment is basically the same as that in Embodiment One, and the differences are as follows:

[0037] The first oil circuit further includes a pressure reducing valve 7. The inlet of the pressure reducing valve 7 is connected to the outlet of the retarder 2, and the outlet of the pressure reducing valve 7 is connected to the inlet of the heat exchanger 3; the pressure reducing valve 7 and the heat exchanger 3 form an oil pipeline 11, and this oil pipeline 11 is connected in parallel with the overflow valve 6. The pressure reducing valve 7 can make the pressure at its outlet lower than the pressure at its inlet and automatically keep the pressure at its outlet in a stable state, so that the pressure at the inlet of the heat exchanger 3 is in a stable state. When the system is working normally, the overflow valve 6 is closed, and the oil flows through the first oil circuit 1. When the system pressure reaches the set value, the overflow valve 6 opens, and the oil flows into the fuel tank 4 through the overflow valve 6. In this process, through the pressure reducing effect of the pressure reducing valve 7, the pressure at the outlet of the pressure reducing valve 7 is kept in a stable state, so that the flow rate at the inlet of the heat exchanger 3 is stable, further improving the service life of the heat exchanger 3 and ensuring the safety and stability of the system.

[0038] Embodiment Three

[0039] Referring to Figure 3 , the heat exchanger flow control oil circuit system of the retarder provided in this embodiment is basically the same as that in Embodiment Two, and the differences are as follows:

[0040] A flow control valve 8 is provided on the oil pipeline 11. The inlet of the flow control valve 8 is connected to the outlet of the pressure reducing valve 7, and the outlet of the flow control valve 8 is connected to the inlet of the heat exchanger 3. The flow control valve 8 can limit the flow rate into the heat exchanger 3. Specifically, in this embodiment, the flow control valve 8 is configured as a flow limiting valve, and the flow limiting valve can close when the flow rate into the heat exchanger 3 exceeds the flow rate that the heat exchanger 3 can withstand. At this time, the oil that cannot pass through enters the fuel tank 4 from the first branch 5, that is, the oil overflows to the fuel tank 4 through the overflow valve 6. The flow control valve 8 can further ensure that the flow rate into the heat exchanger 3 does not exceed the flow rate that the heat exchanger 3 can withstand, ensuring the safety and reliability of the oil circuit system. The pressure reducing valve 7 keeps the pressure difference between the inlet and outlet of the flow control valve 8 within a suitable range, so as to achieve the effect of stable flow rate and improve the safety and stability of the oil circuit system.

[0041] In other embodiments, the flow control valve 8 can also be set as a throttle valve, which can adjust the oil flow rate at its outlet, so as to adjust the oil flow rate flowing into the heat exchanger 3 and make it not exceed the flow rate that the heat exchanger 3 can withstand. The oil that cannot pass through overflows to the oil tank 4 through the overflow valve 6.

[0042] The present invention also provides a retarder, which includes the heat exchanger flow control oil circuit system of the retarder as described above.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flow control oil circuit system for a heat exchanger of a retarder, characterized in that, Comprising: A first oil circuit (1), the first oil circuit (1) including a retarder (2), a heat exchanger (3), and an oil tank (4) that are connected in sequence from start to end. A first branch (5), the first branch (5) being in parallel with the heat exchanger (3); an overflow valve (6) is provided on the first branch (5); when the output flow rate of the retarder (2) does not exceed the flow rate that the heat exchanger (3) can withstand, the overflow valve (6) is in a closed state; when the output flow rate of the retarder (2) exceeds the flow rate that the heat exchanger (3) can withstand, the overflow valve (6) opens, and the oil flowing out from the oil outlet of the retarder (2) overflows to the oil tank (4) through the overflow valve (6).

2. The heat exchanger flow control oil circuit system of the retarder according to claim 1, characterized in that, The overflow valve (6) is set as a pilot-operated overflow valve.

3. The heat exchanger flow control oil circuit system of the retarder according to claim 1, characterized in that, The first oil circuit further includes a pressure reducing valve (7), the inlet of the pressure reducing valve (7) is connected to the outlet of the retarder (2), and the outlet of the pressure reducing valve (7) is connected to the inlet of the heat exchanger (3); the pressure reducing valve (7) and the heat exchanger (3) form an oil pipeline (11), and the oil pipeline (11) is in parallel with the first branch (5).

4. The heat exchanger flow control oil circuit system of the retarder according to claim 3, characterized in that, A flow control valve (8) is provided on the oil pipeline (11), the inlet of the flow control valve (8) is connected to the outlet of the pressure reducing valve (7), and the outlet of the flow control valve (8) is connected to the inlet of the heat exchanger (3).

5. The heat exchanger flow control oil circuit system of the retarder according to claim 4, characterized in that, The flow control valve (8) is set as a flow limiting valve.

6. The heat exchanger flow control oil circuit system of the retarder according to claim 1, characterized in that, The first oil circuit (1) further includes a flow limiting orifice (9), and the flow limiting orifice (9) is provided at the outlet of the retarder (2).

7. The heat exchanger flow control oil circuit system of the retarder according to claim 1, characterized in that, The oil tank (4) is set as an expansion oil tank.

8. The heat exchanger flow control oil circuit system of the retarder according to claim 7, characterized in that, The oil tank (4) is connected to the atmosphere.

9. The heat exchanger flow control oil circuit system of the retarder according to claim 8, characterized in that, A one-way valve (10) is provided between the oil tank (4) and the atmosphere, and the outlet of the one-way valve (10) faces the oil tank (4).

10. A retarder, characterized in that, A heat exchanger flow control oil circuit system including a retarder as described in any one of claims 1 - 9.

Images