A regenerative device with dual function mode of engine and heat pump and operation method

Abstract

The application discloses a heat regenerative device with dual functions of engine and heat pump and an operation method thereof. The heat regenerative device comprises a cylinder, a piston, an ejector, and a low-temperature cavity, a low-temperature heat exchanger, a high-temperature heat exchanger and a high-temperature cavity connected in sequence. The piston, the ejector, the low-temperature cavity and the high-temperature cavity are located in the cylinder. The swept volume of the piston constitutes a compression cavity. The heat regenerative device with dual functions of engine and heat pump further comprises a control valve assembly for controlling the communication and disconnection between the compression cavity and the low-temperature cavity and the communication and disconnection between the compression cavity and the high-temperature cavity. The operation method is as follows: when operating in the engine mode, the control valve assembly communicates the compression cavity with the low-temperature cavity and disconnects the communication between the compression cavity and the high-temperature cavity; when operating in the heat pump mode, the control valve assembly disconnects the communication between the compression cavity and the low-temperature cavity and communicates the compression cavity with the high-temperature cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine and heat pump, in particular to a regenerative device with dual function mode of engine and heat pump and a running method. BACKGROUND

[0002] Both engine and heat pump involve compression and expansion, and the regenerative device realizes compression and expansion of working medium through reciprocating movement of piston, therefore, the regenerative engine device and the regenerative heat pump device have advantages of simple structure and high running efficiency.

[0003] The regenerative engine device and the regenerative heat pump device have similar structure, both have low-temperature cavity, low-temperature heat exchanger, high-temperature heat exchanger, high-temperature cavity, discharger and piston, therefore, the regenerative device can run in engine mode and heat pump mode.

[0004] However, for the regenerative engine device, part of the heat absorbed from the high-temperature heat source is used for work, and part of the heat is discharged as waste heat, that is, part of the heat absorbed from the high-temperature heat exchanger is used for work, and part of the heat is discharged through the low-temperature heat exchanger, therefore, the high-temperature heat exchanger has greater heat exchange capacity than the low-temperature heat exchanger. However, when the regenerative engine device runs in heat pump mode, the high-temperature heat exchanger in the regenerative engine mode is actually the low-temperature heat exchanger in the regenerative heat pump mode, and the low-temperature heat exchanger in the regenerative engine mode is actually the high-temperature heat exchanger in the regenerative heat pump mode, and since the low-temperature heat exchanger in the heat pump mode has greater heat dissipation capacity than the high-temperature heat exchanger, the low-temperature heat exchanger in the regenerative heat pump mode has excessive heat exchange capacity, and the high-temperature heat exchanger has insufficient heat exchange capacity. Similarly, the regenerative heat pump device designed based on the heat pump mode will also have the problem of insufficient heat exchange capacity of one heat exchanger and excessive heat exchange capacity of the other heat exchanger when running in engine mode. Although each heat exchanger can be designed based on the maximum heat exchange capacity in engine and heat pump modes, this will cause at least one heat exchanger to have excessive heat exchange capacity in engine and heat pump modes, thereby increasing dead volume, flow resistance, etc., and further reducing the performance of the engine and heat pump, therefore, the current regenerative device is difficult to realize high-efficiency dual running mode of engine and heat pump. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a regenerative device with dual function mode of engine and heat pump, in which the expansion cavity can be changed to realize precise matching of heat exchange capacity of heat exchangers.

[0006] The present application further provides a running method of the regenerative device with dual function mode of engine and heat pump.

[0007] To solve the above technical problems, the application adopts the following technical solutions:

[0008] A heat regenerative device with dual function of engine and heat pump, comprising a cylinder, a piston, an ejector, and a low-temperature cavity, a low-temperature heat exchanger, a high-temperature heat exchanger and a high-temperature cavity connected in sequence, wherein the piston, the ejector, the low-temperature cavity and the high-temperature cavity are located in the cylinder, the swept volume of the piston constitutes a compression cavity, and the heat regenerative device with dual function of engine and heat pump further comprises a control valve assembly for controlling the communication and disconnection between the compression cavity and the low-temperature cavity and the communication and disconnection between the compression cavity and the high-temperature cavity.

[0009] As a further improvement of the above technical solutions: a heat regenerator is arranged between the low-temperature heat exchanger and the high-temperature heat exchanger.

[0010] As a further improvement of the above technical solutions: the low-temperature heat exchanger and the high-temperature heat exchanger both have liquid heat transfer medium flow channels.

[0011] As a further improvement of the above technical solutions: the heat regenerative device with dual function of engine and heat pump further comprises a transmission mechanism for controlling the phase between the ejector and the piston, and the ejector and the piston are connected to the transmission mechanism.

[0012] As a further improvement of the above technical solutions: when operating in the engine mode, the high-temperature cavity is an expansion cavity, and when operating in the heat pump mode, the low-temperature cavity is an expansion cavity; the phase of the expansion cavity leads the phase of the compression cavity by 60°-150°.

[0013] As a further improvement of the above technical solutions: the heat regenerative device with dual function of engine and heat pump further comprises a generator and drive motor integrated machine, and the piston is connected to the generator and drive motor integrated machine.

[0014] Or, the heat regenerative device with dual function of engine and heat pump further comprises a generator and a drive motor, and the piston is connected to the generator and the drive motor, respectively.

[0015] As a further improvement of the above technical solutions: a first connecting pipe is arranged between the compression cavity and the low-temperature cavity, a second connecting pipe is arranged between the compression cavity and the high-temperature cavity, and the control valve assembly comprises a first control valve arranged on the first connecting pipe and a second control valve arranged on the second connecting pipe.

[0016] As a further improvement of the above technical solutions: the heat exchange capacity of the high-temperature heat exchanger is ≥1.1 times the heat exchange capacity of the low-temperature heat exchanger under the same temperature difference.

[0017] A method for operating the heat regenerative device with dual function of engine and heat pump,

[0018] When running in the engine mode, the control valve assembly communicates the compression chamber with the low-temperature chamber, and disconnects the communication between the compression chamber and the high-temperature chamber;

[0019] When running in the heat pump mode, the control valve assembly disconnects the communication between the compression chamber and the low-temperature chamber, and communicates the compression chamber with the high-temperature chamber.

[0020] As a further improvement of the above technical solution:

[0021] When running in the engine mode, the transmission mechanism is forward, and when running in the heat pump mode, the transmission mechanism is reverse.

[0022] Or, when running in the engine mode, the transmission mechanism is reverse, and when running in the heat pump mode, the transmission mechanism is forward.

[0023] Compared with the prior art, the advantages of the present application are that: the engine and heat pump dual-function mode regenerative device regenerative device disclosed by the present application comprises a cylinder, an exhaust, a piston, and a low-temperature chamber, a low-temperature heat exchanger, a high-temperature heat exchanger and a high-temperature chamber connected in sequence, the exhaust, the piston, the low-temperature chamber and the high-temperature chamber are located in the cylinder, the swept volume of the piston is a compression chamber, and the regenerative device further comprises a control valve assembly, which controls the communication and disconnection of the compression chamber with the low-temperature chamber and the communication and disconnection of the compression chamber with the high-temperature chamber. Therefore, the exchange of the expansion chamber and the compression chamber of the regenerative device can be realized by the control valve assembly, so that the high-temperature heat exchanger and the low-temperature heat exchanger are also exchanged in the engine and heat pump modes, and finally high efficiency is realized.

[0024] The operation method of the regenerative device disclosed by the present application can change the function of the low-temperature chamber or the high-temperature chamber by controlling the communication and disconnection of the compression chamber with the high-temperature chamber and the low-temperature chamber, thereby realizing accurate matching of the corresponding heat exchanger, being easy to realize, and realizing high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the engine and heat pump dual-function mode regenerative device of the present application.

[0026] The numbers in the figure represent: 1, cylinder; 2, low-temperature chamber; 3, low-temperature heat exchanger; 4, regenerator; 5, high-temperature heat exchanger; 61, first connecting pipe; 62, second connecting pipe; 7, high-temperature chamber; 8, control valve assembly; 81, first control valve; 82, second control valve; 9, transmission mechanism; 10, piston; 11, compression chamber; 12, exhaust; 13, generator and drive motor integrated machine. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] In the present application, unless otherwise specifically defined and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The present application is further described in detail below in combination with the drawings and specific embodiments of the present application.

[0031] Embodiment one

[0032] Figure 1 An embodiment of the present application is shown, which is a heat pump and engine dual function mode regenerative device, including: cylinder 1, low temperature cavity 2, low temperature heat exchanger 3, regenerator 4, high temperature heat exchanger 5, first connecting pipe 61, second connecting pipe 62, high temperature cavity 7, compression cavity 11, piston 10 and ejector 12, low temperature cavity 2, high temperature cavity 7, compression cavity 11, piston 10 and ejector 12 are located in the cylinder 1. One end of the low temperature heat exchanger 3 is connected with the low temperature cavity 2, the other end of the low temperature heat exchanger 3 is connected with one end of the high temperature heat exchanger 5 through the regenerator 4, the other end of the high temperature heat exchanger 5 is connected with the high temperature cavity 7. The ejector 12 is used to push the working medium to reciprocate between the low temperature cavity 2 and the high temperature cavity 7, the piston 10 reciprocates in the compression cavity 11, and the swept volume of the piston 10 forms the compression cavity 11. The working medium can be helium, hydrogen, nitrogen, air and the like.

[0033] When the engine and heat pump dual-function mode regenerative device operates in the engine mode, the compression chamber 11 and the low-temperature chamber 2 are communicated through the first control valve 81 and the first connecting pipe 61, the compression chamber 11 and the high-temperature chamber 7 are disconnected through the second control valve 82 and the second connecting pipe 62, the engine and heat pump dual-function mode regenerative device absorbs heat from the high-temperature heat source through the high-temperature heat exchanger 5, and drives the piston 10 to work, part of the heat absorbed from the high-temperature heat source is used for work, and the remaining heat is discharged through the low-temperature heat exchanger 3, the heat discharged by the low-temperature heat exchanger 3 is equal to the difference between the heat absorbed by the high-temperature heat exchanger 5 and the output work of the piston 10, therefore, the heat exchange capacity of the high-temperature heat exchanger 5 needs to be greater than that of the low-temperature heat exchanger 3 under the same temperature difference. When the engine and heat pump dual-function mode regenerative device operates in the heat pump mode, the compression chamber 11 and the low-temperature chamber 2 are disconnected through the first control valve 81 and the first connecting pipe 61, the compression chamber 11 and the high-temperature chamber 7 are connected through the second control valve 82 and the second connecting pipe 62, the external input work drives the piston 10 to compress, absorbs heat from the low-temperature heat source through the low-temperature heat exchanger 3, and then all the energy is discharged through the high-temperature heat exchanger 5, the heat discharged by the high-temperature heat exchanger 5 is equal to the sum of the heat absorbed by the low-temperature heat exchanger 3 and the input work of the piston 10, therefore, the heat exchange capacity of the high-temperature heat exchanger 5 needs to be greater than that of the low-temperature heat exchanger 3 under the same temperature difference. Further, the heat exchange capacity of the high-temperature heat exchanger 5 is ≥1.1 times the heat exchange capacity of the low-temperature heat exchanger 3 under the same temperature difference, preferably, the heat exchange capacity of the high-temperature heat exchanger 5 is 1.5-3 times the heat exchange capacity of the low-temperature heat exchanger 3 under the same temperature difference.

[0034] Further, when the engine and heat pump dual-function mode regenerative device operates in the engine mode, the high-temperature chamber 7 is an expansion chamber, however, when the engine and heat pump dual-function mode regenerative device operates in the heat pump mode, the low-temperature chamber 2 is an expansion chamber, in order to ensure that the expansion chamber leads the compression chamber 11 in phase, the discharger 12 and the piston 10 are connected to the transmission mechanism 9, and the phase stability between the discharger 12 and the piston 10 is realized through the transmission mechanism 9, further, by realizing the forward rotation or reverse rotation of the transmission mechanism 9, it can be ensured that the expansion chamber leads the compression chamber 11 in phase, further, the expansion chamber leads the compression chamber 60-150° in phase.

[0035] Further, the engine and heat pump dual-function mode regenerative device further comprises a generator and a driving motor, in the engine mode, the piston 10 moves to drive the generator to output electric energy, in the heat pump mode, the driving motor inputs electric energy to drive the piston 10 to move. Preferably, the generator and the driving motor are a generator and driving motor integrated machine 13.

[0036] Further, the low-temperature heat exchanger 3 and the high-temperature heat exchanger 5 of the engine and heat pump dual-function mode regenerative device of the application both have liquid heat transfer medium flow channels, that is, the low-temperature heat exchanger 3 and the high-temperature heat exchanger 5 are heat exchangers for the working medium and liquid of the regenerative device.

[0037] Embodiment two

[0038] When the engine and heat pump dual-function mode regenerative device operates in engine mode, the first control valve 81 is controlled to connect the compression chamber 11 and the low temperature chamber 2, the second control valve 82 is controlled to disconnect the compression chamber 11 and the high temperature chamber 7, and the high temperature chamber 7 is the expansion chamber of the regenerative device; when the engine and heat pump dual-function mode regenerative device operates in heat pump mode, the first control valve 81 is controlled to disconnect the compression chamber 11 and the low temperature chamber 2, the second control valve 82 is controlled to connect the compression chamber 11 and the high temperature chamber 7, and the low temperature chamber 2 is the expansion chamber of the regenerative device.

[0039] Further, when the engine and heat pump dual-function mode regenerative device operates in engine mode, the transmission mechanism 9 rotates forward; when the regenerative device operates in heat pump mode, the transmission mechanism 9 rotates reversely.

[0040] Or, when the engine and heat pump dual-function mode regenerative device operates in engine mode, the transmission mechanism 9 rotates reversely; when the regenerative device operates in heat pump mode, the transmission mechanism 9 rotates forward.

[0041] Although the present application has been disclosed with reference to the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the present application, can make many possible changes and modifications to the disclosed technical content, or modify equivalent embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the scope of the present application, shall fall within the scope of the present application.

Claims

1. A regenerative device with dual-function engine and heat pump modes, comprising a cylinder (1), a piston (10), an exhaust device (12), and a low-temperature chamber (2), a low-temperature heat exchanger (3), a high-temperature heat exchanger (5), and a high-temperature chamber (7) connected in sequence, wherein the piston (10), the exhaust device (12), the low-temperature chamber (2), and the high-temperature chamber (7) are located within the cylinder (1), and the scavenging volume of the piston (10) constitutes a compression chamber (11), characterized in that: The regenerative device with dual engine and heat pump modes also includes a control valve assembly (8), which is used to control the connection and disconnection between the compression chamber (11) and the low-temperature chamber (2) and between the compression chamber (11) and the high-temperature chamber (7).

2. The regenerative device with dual engine and heat pump modes according to claim 1, characterized in that: A regenerator (4) is provided between the low-temperature heat exchanger (3) and the high-temperature heat exchanger (5).

3. The regenerative device with dual engine and heat pump modes according to claim 2, characterized in that: Both the low-temperature heat exchanger (3) and the high-temperature heat exchanger (5) have liquid heat transfer medium channels.

4. The regenerative device with dual engine and heat pump modes according to claim 1, characterized in that: It also includes a transmission mechanism (9) for controlling the phase between the discharger (12) and the piston (10), the discharger (12) and the piston (10) being connected to the transmission mechanism (9).

5. The regenerative device with dual engine and heat pump modes according to claim 4, characterized in that: When operating in engine mode, the high-temperature chamber (7) is an expansion chamber, and when operating in heat pump mode, the low-temperature chamber (2) is an expansion chamber; the phase of the expansion chamber leads the compression chamber (11) by 60°~150°.

6. The regenerative device with dual engine and heat pump modes according to claim 4, characterized in that: It also includes a generator and drive motor integrated unit (13), wherein the piston (10) is connected to the generator and drive motor integrated unit (13); Alternatively, it may also include a generator and a drive motor, with the piston (10) connected to the generator and the drive motor respectively.

7. The regenerative device with dual engine and heat pump modes according to any one of claims 1 to 6, characterized in that: A first connecting pipe (61) is provided between the compression chamber (11) and the low temperature chamber (2), and a second connecting pipe (62) is provided between the compression chamber (11) and the high temperature chamber (7). The control valve assembly (8) includes a first control valve (81) provided on the first connecting pipe (61) and a second control valve (82) provided on the second connecting pipe (62).

8. The regenerative device with dual engine and heat pump modes according to any one of claims 1 to 6, characterized in that: The heat exchange capacity of the high-temperature heat exchanger (5) under the same temperature difference is ≥1.1 times that of the low-temperature heat exchanger (3).

9. A method for operating a regenerative device with dual engine and heat pump modes as described in any one of claims 4 to 6, characterized in that: When operating in engine mode, the control valve assembly (8) connects the compression chamber (11) to the low-temperature chamber (2) and disconnects the connection between the compression chamber (11) and the high-temperature chamber (7); When operating in heat pump mode, the control valve assembly (8) disconnects the connection between the compression chamber (11) and the low-temperature chamber (2), and connects the compression chamber (11) and the high-temperature chamber (7).

10. The operating method of the regenerative device with dual engine and heat pump modes according to claim 9, characterized in that: When operating in engine mode, the transmission mechanism (9) rotates forward, and when operating in heat pump mode, the transmission mechanism (9) rotates in reverse. Alternatively, when operating in engine mode, the transmission mechanism (9) reverses, and when operating in heat pump mode, the transmission mechanism (9) rotates forward.

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