Engine waste heat recovery system and automobile

Abstract

The utility model discloses an engine waste heat recovery system and an automobile. The waste heat recovery system comprises an evaporator, an expansion machine, a condenser, a first liquid storage tank and a working medium pump. The system comprises an evaporator, an expansion machine, a condenser, a first liquid storage tank and a working medium pump. The evaporator is used for engine waste heat input. The first liquid storage tank comprises an inlet A1, an inlet A3 and an outlet A2, the inlet A1 is connected with the outlet end of the condenser, the inlet A3 is connected with the outlet end of the working medium pump, and the outlet A2 is connected with the inlet end of the working medium pump. The engine waste heat recovery system further comprises a second liquid storage tank, the arrangement height of the second liquid storage tank is larger than that of the first liquid storage tank, the second liquid storage tank comprises an inlet B1 and an outlet B2, the inlet B1 can be opened and closed, and the outlet B2 is connected with the inlet A1 of the first liquid storage tank. The liquid working medium can be supplemented in time, so that the system works quickly and circularly, and the requirements of different engine waste heat can be met by adjusting the working quantity of the first liquid storage tank.

Description

Technical Field

[0001] The present application relates to the technical field of engine waste heat recovery, and in particular to an engine waste heat recovery system and a vehicle. Background Art

[0002] In order to meet the National VII emission requirements, waste heat recovery technology is used in vehicle energy conservation and emission reduction. The liquid storage tank is a very important part of the waste heat recovery system and plays the role of storing working fluid.

[0003] In order to maintain the overall performance during the normal operation of the waste heat recovery system, the liquid level of the working fluid in the liquid storage tank must be maintained at least in the range of one-third to two-thirds of the total volume of the liquid storage tank. When the working fluid in the liquid storage tank is insufficient, it takes a certain amount of time for the waste heat recovery system to start and operate normally. When the working fluid in the liquid storage tank is seriously insufficient, the waste heat recovery system cannot be started and the working fluid needs to be supplemented.

[0004] At present, the waste heat recovery system is unable to replenish the working fluid quickly and timely to meet the system operation requirements when the working fluid needs to be replenished during the system operation. Utility Model Content

[0005] The purpose of the embodiment of the present application is to provide an engine waste heat recovery system and a vehicle, wherein the engine waste heat recovery system can quickly and timely replenish the liquid working medium to meet the system operation requirements when the liquid working medium is lacking, and can also meet the requirements of adapting to different engine operating conditions by adjusting the working medium flow rate.

[0006] In a first aspect, the present application provides an engine waste heat recovery system, including an evaporator, an expander, a condenser, a first liquid storage tank and a working fluid pump. The evaporator, the expander, the condenser, the first liquid storage tank and the working fluid pump are connected in sequence to form a circulation loop; the evaporator is used for engine waste heat input. The first liquid storage tank includes an inlet A1, an inlet A3 and an outlet A2, the inlet A1 is openably connected to the outlet end of the condenser, the inlet A3 is openably connected to the outlet end of the working fluid pump, and the outlet A2 is openably connected to the inlet end of the working fluid pump. The engine waste heat recovery system also includes a second liquid storage tank, the second liquid storage tank is arranged at a higher height than the first liquid storage tank, the second liquid storage tank includes an inlet B1 and an outlet B2, the inlet B1 can be opened and closed, and the outlet B2 is openably connected to the inlet A1 of the first liquid storage tank.

[0007] In an operative solution, the volume of the second liquid storage tank is V 2 , the volume of the first liquid storage tank is V 1 ,in,

[0008] In an implementable solution, a first electric switch valve is provided on a pipeline connecting the inlet A1 of the first liquid storage tank and the outlet end of the condenser.

[0009] In an implementable solution, a second electric switch valve is provided on the connecting pipeline between the outlet B2 of the second liquid storage tank and the inlet A1 of the first liquid storage tank.

[0010] In an implementable solution, a third electric switching valve is provided at the inlet B1 of the second liquid storage tank.

[0011] In an implementable solution, a fourth electric switch valve is provided on the pipeline connecting the inlet A3 of the first liquid storage tank and the outlet end of the working fluid pump.

[0012] In an implementable solution, a fifth electric switch valve is provided on the pipeline connecting the outlet A2 of the first liquid storage tank and the inlet end of the working fluid pump.

[0013] In an implementable solution, it also includes a first pressure detection device, a first liquid level detection device, a second pressure detection device, and a second liquid level detection device;

[0014] The first pressure detection device is in communication with the first liquid storage tank and is used to detect the pressure in the first liquid storage tank;

[0015] The first liquid level detection device is connected to the first liquid storage tank and is used to detect the liquid level of the working medium in the first liquid storage tank;

[0016] The second pressure detection device is in communication with the second liquid storage tank and is used to detect the pressure in the second liquid storage tank;

[0017] The second liquid level detection device is connected to the second liquid storage tank and is used to detect the liquid level of the working medium in the second liquid storage tank.

[0018] In an implementable solution, a pressure relief valve is further included, which is connected to the second liquid storage tank. When the pressure in the second liquid storage tank reaches a predetermined value, the pressure relief valve opens.

[0019] According to a second aspect of the present application, there is also provided an automobile, comprising the engine waste heat recovery system in the aforementioned solution.

[0020] Compared with the prior art, the beneficial effects of this application include at least:

[0021] The waste heat recovery system of the present application can replenish the working medium to the first liquid storage tank in time when the system cannot be started quickly and normally. The specific operation is as follows: the third electric switch valve and the fourth electric switch valve remain closed, the second electric switch valve is opened, the outlet B2 of the second liquid storage tank and the inlet A1 of the first liquid storage tank are connected at this time, and the liquid working medium in the second liquid storage tank flows into the first liquid storage tank. When the system can be started and operated normally, the second electric switch valve can be closed.

[0022] When the working fluid in the second liquid storage tank is too little, the working fluid can be added to the second liquid storage tank separately without affecting the waste heat recovery system. At this time, the second electric switch valve remains closed and the third electric switch valve is opened.

[0023] In summary, the second liquid storage tank and the first liquid storage tank of the engine waste heat recovery system of the present application form a double-layer liquid storage tank in an up-and-down manner. The structural configuration of the added second liquid storage tank achieves the purpose of timely replenishing the working fluid during system operation.

[0024] At the same time, generally during normal operation, the inlet B1 of the second liquid storage tank is closed, the outlet B2 of the second liquid storage tank is disconnected from the inlet A1 of the first liquid storage tank, and the inlet A1 of the first liquid storage tank is connected to the outlet end of the condenser. However, the outlet B2 of the second liquid storage tank can also be connected to the inlet A1 of the first liquid storage tank during operation, so that the gaseous working fluid in the first liquid storage tank enters the second liquid storage tank, reducing the pressure of the entire engine waste heat recovery system, thereby basically avoiding the problem of working fluid leakage in the first liquid storage tank due to excessive pressure. In addition, if the working fluid required to absorb the engine waste heat is in excess, the fourth electric switch valve provided on the inlet A3 of the first liquid storage tank and the working fluid pump connecting pipe can be opened to allow the excess working fluid to return to the first liquid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the composition of an engine waste heat recovery system according to an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the composition of another engine waste heat recovery system according to an embodiment of the present application.

[0028] In the figure: 1, evaporator; 2, expansion machine; 3, condenser; 4, first liquid storage tank; 5, working fluid pump; 6, second liquid storage tank; 7, pressure relief valve; F1, first electric switch valve; F2, second electric switch valve; F3, third electric switch valve, F4, fourth electric switch valve, F5, fifth electric switch valve; Z1, first pressure detection device; Z2, second pressure detection device; L1, first liquid level detection device; L2, second liquid level detection device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] like Figure 1 As shown, this embodiment first provides an engine waste heat recovery system, including an evaporator 1, an expander 2, a condenser 3, a first liquid storage tank 4 and a working fluid pump 5.

[0032] The evaporator 1, the expander 2, the condenser 3, the first liquid storage tank 4 and the working fluid pump 5 are connected in sequence to form a circulation loop; the evaporator 1 is used for inputting waste heat from the engine. The first liquid storage tank 4 includes an inlet A1, an inlet A3 and an outlet A2, the inlet A1 is openably connected to the outlet end of the condenser 3, the inlet A3 is openably connected to the outlet end of the working fluid pump 5, and the outlet A2 is openably connected to the inlet end of the working fluid pump 5.

[0033] The engine waste heat recovery system further includes a second liquid storage tank 6, which is arranged at a higher height than the first liquid storage tank 4. The second liquid storage tank 6 includes an inlet B1 and an outlet B2, the inlet B1 is openable and closable, and the outlet B2 is openably and closably connected to the inlet A1 of the first liquid storage tank 4.

[0034] When the system is started, if the first liquid storage tank 4 needs to be filled with working fluid, the third electric switch valve F3 and the fourth electric switch valve F4 remain closed. The second electric switch valve F2 is opened, and the inlet A1 of the first liquid storage tank 4 and the outlet B2 of the second liquid storage tank 6 remain connected. At this time, the liquid working fluid in the second liquid storage tank 6 enters the first liquid storage tank 4, and the first liquid level detection device L1 and the second liquid level detection device L2 are used to determine whether the filling is successful, and the system reaches the normal startup and operation conditions.

[0035] At the same time, during normal operation, if there is excess working fluid required to absorb the engine waste heat, the electric switch valve F4 provided on the inlet A3 of the first liquid storage tank 4 and the connecting pipe of the working fluid pump 5 can be opened to allow the excess working fluid to return to the first liquid storage tank 4.

[0036] When the second liquid storage tank 6 needs to be supplemented with working fluid, the second electric switch valve F2 remains closed, the third electric switch valve F3 is opened, and the external working fluid supplement device is connected to fill the working fluid for supplementation.

[0037] In summary, the second liquid storage tank 6 and the first liquid storage tank 4 of the engine waste heat recovery system of the present application form a double-layer liquid storage tank in an up-and-down manner. By adding the structural configuration of the second liquid storage tank 6, the purpose of quickly starting the system operation is achieved by timely replenishing the working fluid when the system is difficult to start.

[0038] Meanwhile, generally during normal operation, the inlet B1 of the second liquid storage tank 6 is closed, the outlet B2 of the second liquid storage tank 6 is disconnected from the inlet A1 of the first liquid storage tank 4, and the inlet A1 of the first liquid storage tank 4 is connected to the outlet end of the condenser 3. However, the outlet B2 of the second liquid storage tank 6 can also be connected to the inlet A1 of the first liquid storage tank 4 during operation, so that the gaseous working medium in the first liquid storage tank 4 enters the second liquid storage tank 6, reducing the pressure of the entire engine waste heat recovery system, thereby basically avoiding the problem of working medium leakage in the first liquid storage tank 4 due to excessive pressure.

[0039] In this embodiment, the volume of the second liquid storage tank 6 is V 2 , the volume of the first liquid storage tank 4 is V 1 ,in, Thereby, the second liquid storage tank 6 can better receive the gaseous working medium and reduce the pressure of the second liquid storage tank 6 .

[0040] In this embodiment, if Figure 1 As shown, a first electric switch valve F1 is provided on the pipeline connecting the inlet A1 of the first liquid storage tank 4 and the outlet end of the condenser 3 .

[0041] In this embodiment, if Figure 1As shown, a fifth electric switch valve F5 is provided on the pipeline connecting the outlet A2 of the first liquid storage tank 4 and the inlet end of the working fluid pump 5 .

[0042] In this embodiment, if Figure 1 As shown, a fourth electric switch valve F4 is provided on the pipeline connecting the inlet A3 of the first liquid storage tank 4 and the outlet end of the working fluid pump 5 .

[0043] In this embodiment, if Figure 1 As shown, a third electric switch valve F3 is provided at the inlet B1 of the second liquid storage tank 6 .

[0044] In this embodiment, if Figure 1 As shown, a second electric switch valve F2 is provided on the connecting pipeline between the outlet B2 of the second liquid storage tank 6 and the inlet A1 of the first liquid storage tank 4 .

[0045] It should be noted that the engine waste heat recovery system includes a controller, which can not only be connected to the circuits of the evaporator 1, the expander 2, the condenser 3 and the working fluid pump 5 to control their start and stop, but also be connected to the circuits of the first electric switch valve F1, the second electric switch valve F2, the third electric switch valve F3, the fourth electric switch valve F4 and the fifth electric switch valve F5 to control the opening and closing of the five valves.

[0046] In this embodiment, if Figure 2 As shown, the engine waste heat recovery system also includes a first pressure detection device Z1, a first liquid level detection device L1, a second pressure detection device Z2, and a second liquid level detection device. The first pressure detection device Z1 is connected to the first liquid storage tank 4, and is used to detect the pressure in the first liquid storage tank 4; the first liquid level detection device L1 is connected to the first liquid storage tank 4, and is used to detect the liquid level of the working medium in the first liquid storage tank 4. The second pressure detection device Z2 is connected to the second liquid storage tank 6, and is used to detect the pressure in the second liquid storage tank 6; the second liquid level detection device L2 is connected to the second liquid storage tank 6, and is used to detect the liquid level of the working medium in the second liquid storage tank 6.

[0047] The controller in the engine waste heat recovery system can be connected to the first pressure detection device Z1, the first liquid level detection device L1 and the second pressure detection device Z2, and the second liquid level detection device circuit. When the first pressure detection device Z1 detects that the pressure in the first liquid storage tank 4 is too high, the second electric switching valve F2 can be opened in time to discharge the gaseous working medium in the first liquid storage tank 4 into the second liquid storage tank 6.

[0048] In this embodiment, if Figure 2As shown, the engine waste heat recovery system may further include a pressure relief valve 7, which is connected to the second liquid storage tank 6. When the pressure in the second liquid storage tank 6 reaches a predetermined value, the pressure relief valve 7 opens to discharge the gaseous working fluid to ensure that the pressure is within a safe range.

[0049] This embodiment also provides a car, including the engine waste heat recovery system in the aforementioned solution.

[0050] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An engine waste heat recovery system, characterized in that: It comprises an evaporator (1), an expander (2), a condenser (3), a first liquid storage tank (4) and a working fluid pump (5); The evaporator (1), the expander (2), the condenser (3), the first liquid storage tank (4) and the working fluid pump (5) are connected in sequence to form a circulation loop; the evaporator (1) is used for inputting waste heat from the engine; The first liquid storage tank (4) comprises an inlet A1, an inlet A3 and an outlet A2, the inlet A1 is openably connected to the outlet end of the condenser (3), the inlet A3 is openably connected to the outlet end of the working fluid pump (5), and the outlet A2 is openably connected to the inlet end of the working fluid pump (5); The engine waste heat recovery system further comprises a second liquid storage tank (6), wherein the second liquid storage tank (6) is arranged at a higher height than the first liquid storage tank (4); The second liquid storage tank (6) comprises an inlet B1 and an outlet B2, the inlet B1 is openable and closable, and the outlet B2 is openably and closably connected to the inlet A1 of the first liquid storage tank (4).

2. The engine waste heat recovery system according to claim 1, characterized in that: The volume of the second liquid storage tank (6) is V2, and the volume of the first liquid storage tank (4) is V1, wherein:

3. The engine waste heat recovery system according to claim 1, characterized in that: A first electric switch valve (F1) is provided on a pipeline connecting the inlet A1 of the first liquid storage tank (4) and the outlet end of the condenser (3).

4. The engine waste heat recovery system according to claim 1, characterized in that: A third electric switch valve (F3) is provided at the inlet B1 of the second liquid storage tank (6).

5. The engine waste heat recovery system according to claim 1, characterized in that: A second electric switch valve (F2) is provided on the connecting pipeline between the outlet B2 of the second liquid storage tank (6) and the inlet A1 of the first liquid storage tank (4).

6. The engine waste heat recovery system according to claim 1, characterized in that: A fourth electric switch valve (F4) is provided on the connecting pipeline between the inlet A3 of the first liquid storage tank (4) and the outlet end of the working fluid pump (5).

7. The engine waste heat recovery system according to claim 1, characterized in that: A fifth electric switch valve (F5) is provided on the connecting pipeline between the outlet A2 of the first liquid storage tank (4) and the inlet end of the working fluid pump (5).

8. The engine waste heat recovery system according to any one of claims 1 to 7, characterized in that: It also includes a first pressure detection device (Z1), a first liquid level detection device (L1), a second pressure detection device (Z2), and a second liquid level detection device (L2); The first pressure detection device (Z1) is connected to the first liquid storage tank (4) and is used to detect the pressure in the first liquid storage tank (4); The first liquid level detection device (L1) is connected to the first liquid storage tank (4) and is used to detect the liquid level of the working medium in the first liquid storage tank (4); The second pressure detection device (Z2) is connected to the second liquid storage tank (6) and is used to detect the pressure in the second liquid storage tank (6); The second liquid level detection device (L2) is connected to the second liquid storage tank (6) and is used to detect the liquid level of the working medium in the second liquid storage tank (6).

9. The engine waste heat recovery system according to claim 8, characterized in that: It also comprises a pressure relief valve (7), which is in communication with the second liquid storage tank (6). When the pressure in the second liquid storage tank (6) reaches a predetermined value, the pressure relief valve (7) opens.

10. An automobile, characterized in that: It comprises an engine waste heat recovery system as described in any one of claims 1 to 9.

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