Gas supply system

Abstract

The utility model provides a gas supply system, comprising: a heat exchange structure, which comprises a fuel channel and a heat exchange channel which are arranged at an interval, the fuel channel is used for introducing fuel, the heat exchange channel is used for introducing a heat exchange medium, and the heat exchange channel is used for exchanging heat with the fuel channel; the cooling device is provided with a cooling channel, the cooling channel is selectively communicated with or disconnected from the heat exchange channel, and the cooling device is used for exchanging heat with the engine; the heating structure is provided with a heating channel, and the heating structure has a disconnected state and a working state; when the heating structure is in the disconnected state, the heat exchange channel and the cooling channel are disconnected from the heating channel, and the heat exchange channel communicates with the cooling channel; when the heating structure is in the working state, the heating channel selectively communicates with at least one of the heat exchange channel and the cooling channel. According to the technical scheme, the problem that in the prior art, an air supply system is low in air supply efficiency when the environment temperature is low can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine air supply devices, in particular to an air supply system. Background Art

[0002] At present, in the air supply system, it is often necessary to store the fuel in liquid form to increase the storage capacity of the fuel. Therefore, when supplying air to the engine, the stored liquid fuel needs to be vaporized to convert it into gaseous form. The air supply system in the prior art often arranges a heat exchange device on the air supply pipeline, the heat exchange device is connected to the engine cooling device, and the coolant circulates between the heat exchange device and the cooling device to exchange heat with the liquid fuel through the coolant to vaporize it.

[0003] However, when the ambient temperature is low, it is often difficult to start the engine. In addition, for a period of time after the engine is started, the coolant temperature of the cooling device is difficult to increase, which will lead to low heat exchange efficiency of the coolant to the liquid fuel, and the liquid fuel is difficult or even impossible to vaporize in the heat exchange device, resulting in low air supply efficiency of the air supply system. Utility Model Content

[0004] The main purpose of the utility model is to provide an air supply system to solve the problem of low air supply efficiency of the air supply system in the prior art when the ambient temperature is low.

[0005] In order to achieve the above object, the utility model provides a gas supply system, comprising:

[0006] The heat exchange structure comprises a fuel channel and a heat exchange channel arranged at intervals, wherein the fuel channel is used to introduce fuel, the heat exchange channel is used to introduce heat exchange medium, and the heat exchange channel is used to exchange heat with the fuel channel;

[0007] An engine and a cooling device, wherein a fuel injection mechanism of the engine can be selectively connected or disconnected with an outlet of a fuel channel, and the cooling device has a cooling channel, which can be selectively connected or disconnected with a heat exchange channel, and the cooling device is used to exchange heat with the engine;

[0008] The heating structure has a heating channel, and the heating structure has an off state and a working state; when the heating structure is in the off state, the heat exchange channel and the cooling channel are both disconnected from the heating channel, and the heat exchange channel is connected to the cooling channel; when the heating structure is in the working state, the heating channel can be selectively connected to at least one of the heat exchange channel and the cooling channel.

[0009] Furthermore, the gas supply system also includes:

[0010] A first switching valve is arranged on a first connecting branch between the heating channel and the first end of the heat exchange channel, and the first switching valve can be opened and closed;

[0011] A second switching valve, wherein a first communication port of the second switching valve is connected to a portion of the first communication branch between the first switching valve and the heating channel, a second communication port of the second switching valve is connected to an inlet of the cooling channel, and the second switching valve is openably and closably arranged;

[0012] The outlet of the cooling channel is communicated with a second communication branch arranged between the heating channel and the second end of the heat exchange channel.

[0013] Furthermore, the heating structure includes a gas heating element, which is used to heat the heat exchange medium in the heating channel; the gas supply system also includes:

[0014] A reservoir, wherein a first connection port of the reservoir can be selectively connected or disconnected with a flow path between a fuel channel and a fuel injection mechanism, and a second connection port of the reservoir can be selectively connected or disconnected with a gas heating element.

[0015] Furthermore, the gas supply system also includes:

[0016] A first switch valve is provided in a flow path between the first connection port and the fuel passage and the fuel injection mechanism;

[0017] A second switch valve is arranged on the flow path between the second connection port and the gas heating element;

[0018] Among them, the storage device has a gas storage state and a gas release state; when the storage device is in the gas storage state, the first switch valve is opened and the second switch valve is closed; when the storage device is in the gas release state, at least one of the first switch valve and the second switch valve is opened.

[0019] Furthermore, the gas supply system also includes:

[0020] The first pressure detection member has a detection portion disposed in the gas storage cavity of the reservoir to detect the pressure in the gas storage cavity.

[0021] Further, the air supply system further comprises a temperature regulating branch, one end of the temperature regulating branch is connected to the inlet of the fuel channel, the other end of the temperature regulating branch is connected to the outlet of the fuel channel, and the temperature regulating branch has a first connected state and a first disconnected state; when the temperature regulating branch is in the first connected state, the temperature regulating branch is used to introduce liquid fuel into the outlet of the fuel channel; and / or,

[0022] The air supply system further includes a first temperature detecting member, a detecting portion of which is disposed at an outlet of the fuel channel to detect the temperature at the outlet of the fuel channel.

[0023] Furthermore, the air supply system further includes a fuel main path, the outlet of the fuel channel and the fuel injection mechanism are connected through the fuel main path, and the fuel main path has a second connected state and a second disconnected state; the air supply system further includes:

[0024] A third switch valve is arranged on the fuel main line;

[0025] The pressure relief branch has a first pressure relief inlet, a second pressure relief inlet and a pressure relief outlet, and the first pressure relief inlet and the second pressure relief inlet can be selectively connected to or disconnected from the pressure relief outlet; the first pressure relief inlet is arranged at a position of the fuel main circuit between the third switch valve and the outlet of the fuel channel, and the second pressure relief inlet is arranged at a position of the fuel main circuit between the third switch valve and the fuel injection mechanism.

[0026] Furthermore, the pressure relief branch circuit also has a third pressure relief inlet and a fourth pressure relief inlet, and the third pressure relief inlet and the fourth pressure relief inlet can be selectively connected to or disconnected from the pressure relief outlet; the third pressure relief inlet is arranged at a position of the fuel main circuit between the third switch valve and the outlet of the fuel channel, and the fourth pressure relief inlet is arranged at a position of the fuel main circuit between the third switch valve and the fuel injection mechanism; the air supply system also includes:

[0027] A first vent valve is disposed between the first pressure relief inlet and the pressure relief outlet; and / or,

[0028] A second vent valve is disposed between the second pressure relief inlet and the pressure relief outlet; and / or,

[0029] A first pressure safety valve is arranged between the third pressure relief inlet and the pressure relief outlet; and / or,

[0030] The second pressure safety valve is arranged between the fourth pressure relief inlet and the pressure relief outlet.

[0031] Furthermore, the gas supply system also includes:

[0032] A flame arrester, provided at the pressure relief outlet; and / or,

[0033] The filter has a filter inlet, a filter outlet and a drain outlet. The filter inlet is connected to the outlet of the fuel channel, the filter outlet is connected to the fuel injection mechanism, and the drain outlet can be selectively connected to or disconnected from the pressure relief outlet.

[0034] Furthermore, the gas supply system also includes:

[0035] A second pressure detection member is disposed in the fuel main line, and the second pressure detection member is used to detect the pressure of the fuel main line; and / or,

[0036] A pressure regulating valve is arranged on the main fuel line, and is used to regulate the pressure of the main fuel line; and / or,

[0037] a third pressure detection member, arranged at the inlet of the heat exchange channel, to detect the pressure value at the inlet of the heat exchange channel; and / or,

[0038] The flow meter is arranged on the main fuel line to detect the flow to the fuel injection mechanism.

[0039] By applying the technical solution of the utility model, when the heating structure is in the disconnected state, the heat exchange channel is connected with the cooling channel, and after the cooling device exchanges heat with the engine, the heat exchange medium with a higher temperature in the cooling channel flows into the heat exchange channel to heat the fuel in the fuel channel and vaporize it; when the heating structure is in the working state, the heating structure operates to exchange heat with the heat exchange medium flowing into the heating channel; if the heating channel is connected with the heat exchange channel, the heat exchange medium with a higher temperature in the heating channel flows into the heat exchange channel, so that the fuel in the fuel channel can be heated and vaporized; if the heating channel is connected with the cooling channel, the heat exchange medium with a higher temperature in the heating channel flows into the cooling channel, so that the engine can be preheated, so as to ensure that the engine can be started smoothly; if the heating channel is connected with the heat exchange channel and the cooling channel at the same time, the engine can be preheated while the fuel in the fuel channel is heated by the heating structure. Therefore, by setting the heating structure, the engine can be preheated to ensure that it can start normally, and the fuel can be actively heated to vaporize it when the temperature of the heat exchange medium in the cooling device is low, so as to ensure the air supply efficiency of the air supply system. Therefore, the present application can solve the problem of low gas supply efficiency of the gas supply system in the prior art when the ambient temperature is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0041] Figure 1 A schematic diagram of an air supply system provided according to an embodiment of the utility model is shown.

[0042] The above drawings include the following reference numerals:

[0043] 11. heat exchange structure; 12. heating structure; 13. first communication branch; 131. first switching valve; 14. second communication branch; 15. third communication branch; 151. second switching valve; 16. fourth communication branch;

[0044] 20. fuel injection mechanism; 21. fourth pressure detection member; 22. second temperature detection member;

[0045] 30. gas storage branch; 31. storage; 311. first connection port; 312. second connection port; 32. first switch valve; 33. second switch valve; 34. first pressure detection member;

[0046] 40. Temperature regulating branch; 41. Temperature regulating valve;

[0047] 50. Main fuel line; 51. First temperature detection element; 52. Third switch valve; 53. Filter; 531. Drain port; 54. Second pressure detection element; 55. Flow meter; 56. Pressure regulating valve; 57. Pressure differential transmitter; 58. Check valve;

[0048] 60, pressure relief branch; 611, first pressure relief inlet; 612, first vent valve; 621, second pressure relief inlet; 622, second vent valve; 631, third pressure relief inlet; 632, first pressure safety valve; 641, fourth pressure relief inlet; 642, second pressure safety valve; 65, pressure relief outlet; 66, flame arrester; 67, drain valve;

[0049] 70. fuel inlet; 71. third pressure detection member; 72. feed valve; 73. fuel pump;

[0050] 90. Fuel tank. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] like Figure 1 As shown, the utility model provides an air supply system, which includes a heat exchange structure 11, an engine and a cooling device. The heat exchange structure 11 includes a fuel channel and a heat exchange channel arranged at intervals, the fuel channel is used to pass fuel, the heat exchange channel is used to pass heat exchange medium, and the heat exchange channel is used to exchange heat with the fuel channel; the fuel injection mechanism 20 of the engine can be selectively connected or disconnected with the outlet of the fuel channel, the cooling device has a cooling channel, the cooling channel can be selectively connected or disconnected with the heat exchange channel, and the cooling device is used to exchange heat with the engine; the heating structure 12 has a heating channel, and the heating structure 12 has a disconnected state and a working state; when the heating structure 12 is in the disconnected state, the heat exchange channel and the cooling channel are both disconnected from the heating channel, and the heat exchange channel is connected to the cooling channel; when the heating structure 12 is in the working state, the heating channel can be selectively connected to at least one of the heat exchange channel and the cooling channel.

[0053] With the air supply system provided by the utility model, when the heating structure 12 is in the disconnected state, the heat exchange channel is connected to the cooling channel, and after the cooling device exchanges heat with the engine, the heat exchange medium with a higher temperature in the cooling channel flows into the heat exchange channel to heat the fuel in the fuel channel and vaporize it. When the heating structure 12 is in the working state, the heating structure 12 operates to exchange heat with the heat exchange medium flowing into the heating channel; if the heating channel is connected to the heat exchange channel, the heat exchange medium with a higher temperature in the heating channel flows into the heat exchange channel, thereby heating the fuel in the fuel channel and vaporizing it; if the heating channel is connected to the cooling channel, the heat exchange medium with a higher temperature in the heating channel flows into the cooling channel, thereby preheating the engine, thereby ensuring that the engine can be started smoothly; if the heating channel is connected to the heat exchange channel and the cooling channel at the same time, the engine can be preheated while heating the fuel in the fuel channel through the heating structure 12. Therefore, by providing the heating structure 12, the engine can be preheated to ensure that it can start normally, and the fuel can be actively heated to vaporize it when the temperature of the heat exchange medium in the cooling device is low, thereby ensuring the air supply efficiency of the air supply system.

[0054] Specifically, the engine is a dual-fuel engine, and the air supply system of this embodiment is used to provide gaseous fuel to the engine.

[0055] Specifically, the heating structure 12 may be an electric heater or a gas heater.

[0056] Specifically, the air supply system also includes a fuel tank 90 for storing liquid fuel. The fuel tank 90 can be selectively connected to the fuel channel of the heat exchange structure 11. When the fuel tank 90 is connected to the heat exchange structure 11, the fuel tank 90 provides the stored liquid fuel to the fuel channel.

[0057] Specifically, the heating structure 12 and the heat exchange structure 11 are two separate components, and the two can also be a whole, such as a water jacket heating furnace, in which the heating structure 12 that burns fuel and the heat exchange structure 11 are in the same furnace body.

[0058] Specifically, the air supply system includes a first working state, a second working state, a third working state and a fourth working state. When the air supply system is in the first working state, the heating structure 12 is in a disconnected state, and the heat exchange channel is connected to the cooling channel; when the air supply system is in the second working state, the heating structure 12 is in a connected state, the heating channel is connected to the heat exchange channel, and the heat exchange channel and the cooling channel are disconnected; when the air supply system is in the third working state, the heating structure 12 is in a connected state, the heating channel is connected to the cooling channel, and the heat exchange channel and the cooling channel are disconnected; when the air supply system is in the fourth working state, the heating structure 12 is in a connected state, and the heating channel is connected to both the heat exchange channel and the cooling channel.

[0059] In this embodiment, the air supply system further includes a first switching valve 131 and a second switching valve 151. The first switching valve 131, which can be opened and closed, is arranged on the first connecting branch 13 between the first end of the heating channel and the heat exchange channel, the first connecting port of the second switching valve 151, which can be opened and closed, is connected to the portion of the first connecting branch 13 located between the first switching valve 131 and the heating channel, and the second connecting port of the second switching valve 151 is connected to the inlet of the cooling channel; wherein the outlet of the cooling channel is connected to the second connecting branch 14 arranged between the second end of the heating channel and the heat exchange channel.

[0060] With such a setting, when the air supply system is in the first working state, the heating structure 12 is in the disconnected state, the first switching valve 131 and the second switching valve 151 are both opened, and the heat exchange medium circulates between the heat exchange channel and the cooling channel; when the air supply system is in the second working state, the first switching valve 131 is opened, the second switching valve 151 is closed, and the heat exchange medium circulates between the heating channel and the heat exchange channel; when the air supply system is in the third working state, the first switching valve 131 is closed, the second switching valve 151 is opened, and the heat exchange medium circulates between the heating channel and the heat exchange channel and the cooling channel; when the air supply system is in the fourth working state, the first switching valve 131 is opened, the second switching valve 151 is opened, and the heat exchange medium circulates between the heating channel and the heat exchange channel and the cooling channel. Thus, by setting the first switching valve 131 and the second switching valve 151, the switching of the flow direction of the heat exchange medium in the air supply system is realized.

[0061] Specifically, the second switching valve 151 is arranged on the third connecting branch 15 between the part of the first connecting branch 13 located between the first switching valve 131 and the heating channel and the inlet of the cooling channel, and the outlet of the cooling channel is connected to the second connecting branch 14 through the fourth connecting branch 16.

[0062] Specifically, the inlet of the cooling channel is Figure 1 The outlet of the cooling channel is PT1. Figure 1 PT2 port in the

[0063] In this embodiment, the heating structure 12 includes a gas heating element, which is used to heat the heat exchange medium in the heating channel. The gas supply system also includes a reservoir 31, and the first connection port 311 of the reservoir 31 can be selectively connected or disconnected with the flow path between the fuel channel and the fuel injection mechanism 20, and the second connection port 312 of the reservoir 31 can be selectively connected or disconnected with the gas heating element. In this way, the gas fuel obtained by heat exchange of the heat exchange structure 11 can be stored in the reservoir 31. When the engine is started, the fuel injection mechanism 20 can be supplied with gas by connecting the first connection port of the reservoir 31 with the flow path between the material channel and the fuel injection mechanism 20; when the heating structure 12 is in working state, the gas heating element can be supplied with gas by connecting the second connection port 312 with the gas heating element, so that the gas heating element heats the heat exchange medium in the heating channel, and the heated heat exchange medium is passed into the heat exchange structure 11, which can vaporize the liquid fuel in the heat exchange channel, thereby ensuring the gas supply efficiency of the gas supply system.

[0064] In this embodiment, the gas supply system further includes a first switch valve 32 and a second switch valve 33. The first switch valve 32 is arranged on the flow path between the first connection port 311 and the fuel channel and the fuel injection mechanism 20, and the second switch valve 33 is arranged on the flow path between the second connection port 312 and the gas heating element; the storage 31 has a gas storage state and a gas release state; when the storage 31 is in the gas storage state, the first switch valve 32 is opened and the second switch valve 33 is closed; when the storage 31 is in the gas release state, at least one of the first switch valve 32 and the second switch valve 33 is opened.

[0065] With such a configuration, when the storage 31 is in the gas storage state, the first switch valve 32 is opened and the second switch valve 33 is closed, and the storage 31 can store the gas fuel obtained by heat exchange of the heat exchange structure 11. When the storage 31 is in the gas release state, if the first switch valve 32 is opened and the second switch valve 33 is closed, the storage 31 can supply gas to the fuel injection mechanism 20; if the first switch valve 32 is closed and the second switch valve 33 is opened, the storage 31 can supply gas to the gas heating element; if both the first switch valve 32 and the second switch valve 33 are opened, the gas fuel obtained by heat exchange of the heat exchange structure 11 can flow through the storage 31 and pass to the gas heating element to supply gas thereto. Thus, the switching of the working state of the storage 31 is realized by the first switch valve 32 and the second switch valve 33.

[0066] Specifically, the reservoir 31 is arranged on the gas storage branch 30 between the gas heating element and the flow path between the fuel channel and the fuel injection mechanism 20. When the reservoir 31 is in a gas storage state, the heating structure 12 is in a disconnected state; when the reservoir 31 is in a deflation state and the second switch valve 33 is opened, the heating structure 12 is in a working state; when the reservoir 31 is in a deflation state and the first switch valve 32 and the second switch valve 33 are both opened, the gas fuel obtained by heat exchange with the heat exchange structure 11 can flow through the reservoir 31 and pass to the gas heating element to supply gas thereto.

[0067] In this embodiment, the gas supply system further includes a first pressure detection member 34, the detection portion of which is disposed in the gas storage cavity of the reservoir 31 to detect the pressure in the gas storage cavity. In this way, when the reservoir 31 is in the gas storage state, the pressure in the gas storage cavity can be detected by the first pressure detection member 34, and the first switch valve 32 can be controlled by the detection result of the first pressure detection member 34. When the pressure value detected by the first pressure detection member 34 reaches a preset pressure value, the first switch valve 32 is closed, and the gas supply to the reservoir 31 is stopped, so that sufficient gas can be stored in the reservoir 31 to supply gas to the heating structure 12 or the fuel injection mechanism 20 when the engine is started next time.

[0068] Specifically, during normal operation, the gas fuel in the storage can be supplied to the heating structure 12 for a short time to ensure the normal operation of the heating structure 12. The first pressure detection member 34 can detect the working pressure in the storage, and the storage 31 sets high and low pressure limits. When the working pressure in the storage 31 exceeds the set high pressure value, the control system issues an instruction to close the first switch valve 32 and stop supplying gas fuel to the storage 31. When the pressure in the storage 31 is lower than the low pressure limit, the control system issues an instruction to open the first switch valve 32 and supply gas to the storage 31 to ensure the normal working pressure of the storage 31.

[0069] In this embodiment, the air supply system further includes a temperature regulating branch 40, one end of which is connected to the inlet of the fuel channel, and the other end of which is connected to the outlet of the fuel channel. The temperature regulating branch 40 has a first connected state and a first disconnected state. When the temperature regulating branch 40 is in the first connected state, the temperature regulating branch 40 is used to introduce liquid fuel to the outlet of the fuel channel. In this way, when the gas temperature at the outlet of the fuel channel is higher than the preset temperature, liquid fuel can be introduced to the outlet of the fuel channel through the temperature regulating branch 40, so that the gas at the fuel outlet can be cooled down, so that the temperature of the heat-insulating gas fuel can meet the normal use requirements of the engine.

[0070] Specifically, a thermostatic valve 41 is provided on the thermostatic branch 40. When the thermostatic valve 41 is opened, the thermostatic branch 40 is in a first connected state. When the thermostatic valve 41 is closed, the thermostatic branch 40 is in a first disconnected state.

[0071] In this embodiment, the air supply system further includes a first temperature detection member 51, and the detection portion of the first temperature detection member 51 is arranged at the outlet of the fuel channel to detect the temperature at the outlet of the fuel channel. In this way, the temperature at the outlet of the fuel channel can be detected by the first temperature detection member 51, so that the state of the temperature regulating branch 40 can be controlled according to the detection result of the first temperature detection member 51.

[0072] In this embodiment, the gas supply system further includes a fuel main path 50, a third switch valve 52 and a pressure relief branch 60. The outlet of the fuel channel and the fuel injection mechanism 20 are connected through the fuel main path 50. The fuel main path 50 has a second connected state and a second disconnected state. The third switch valve 52 is arranged on the fuel main path 50. The pressure relief branch 60 has a first pressure relief inlet 611, a second pressure relief inlet 621 and a pressure relief outlet 65. The first pressure relief inlet 611 and the second pressure relief inlet 621 can be selectively connected or disconnected with the pressure relief outlet 65. The first pressure relief inlet 611 is arranged at a position of the fuel main path 50 between the third switch valve 52 and the outlet of the fuel channel, and the second pressure relief inlet 621 is arranged at a position of the fuel main path 50 between the third switch valve 52 and the fuel injection mechanism 20.

[0073] By adopting such a setting, the opening and closing of the fuel main path 50 can be controlled by the third switch valve 52, and by setting the first pressure relief inlet 611 between the third switch valve 52 and the outlet of the fuel channel, the gas in the part of the pipeline between the third switch valve 52 and the outlet of the fuel channel can be released, and the second pressure relief inlet 621 is set between the third switch valve 52 and the outlet of the fuel injection mechanism 20, so that the gas in the part of the pipeline between the third switch valve 52 and the fuel injection mechanism 20 can be released, so that when the pressure of the fuel main path 50 exceeds the preset value, the pressure of the fuel main path 50 can be released to ensure the safety of the use of the gas supply system. In addition, by setting two pressure relief inlets, the pressure relief efficiency can be improved, and when one of the pressure relief inlets cannot be normally connected to the pressure relief outlet 65, the other pressure relief inlet can also be connected to the pressure relief outlet 65 in time, so that the gas in the fuel main path 50 can be released in time, thereby further ensuring the safety of the use of the gas supply system.

[0074] In this embodiment, the pressure relief branch 60 further has a third pressure relief inlet 631 and a fourth pressure relief inlet 641, which can be selectively connected or disconnected with the pressure relief outlet 65; the third pressure relief inlet 631 is arranged between the third switch valve 52 and the outlet of the fuel channel of the fuel main path 50, and the fourth pressure relief inlet 641 is arranged between the third switch valve 52 and the fuel injection mechanism 20 of the fuel main path 50. The gas supply system also includes a first vent valve 612, a second vent valve 622, a first pressure safety valve 632, and a second pressure safety valve 642. The first vent valve 612 is arranged between the first pressure relief inlet 611 and the pressure relief outlet 65, the second vent valve 622 is arranged between the second pressure relief inlet 621 and the pressure relief outlet 65, the first pressure safety valve 632 is arranged between the third pressure relief inlet 631 and the pressure relief outlet 65, and the second pressure safety valve 642 is arranged between the fourth pressure relief inlet 641 and the pressure relief outlet 65.

[0075] With such an arrangement, the pressure of the fuel line can be released in time by opening the first vent valve 612 to connect the first pressure relief inlet 611 and the pressure relief outlet 65, and opening the second vent valve 622 to connect the second pressure relief inlet 621 and the pressure relief outlet 65. Furthermore, a third pressure relief inlet 631 is provided between the third switch valve 52 and the outlet of the fuel channel, and a first pressure safety valve 632 is provided between the third pressure relief inlet 631 and the pressure relief outlet 65. When the pressure at the third pressure relief inlet 631 reaches the pressure relief preset value, the first pressure safety valve 632 can be opened in time to release the pressure in the system. If the first drain valve 612 cannot function normally, the pressure in the fuel main path 50 can also be released in time. Similarly, a second pressure safety valve 642 is provided between the fourth pressure relief inlet 641 and the pressure relief outlet 65. When the pressure at the fourth pressure relief inlet 641 reaches the pressure relief preset value, the second pressure safety valve 642 can be opened in time to release the pressure in the system. If the second drain valve 622 cannot function normally, the pressure in the fuel main path 50 can also be released in time, thereby ensuring the safety of the air supply system.

[0076] In this embodiment, the gas supply system further includes a flame arrester 66, which is arranged at the pressure relief outlet 65. In this way, the gas fuel released from the pressure relief outlet 65 can be prevented from back-burning, thereby ensuring the safety of the gas supply system during use.

[0077] In this embodiment, the air supply system further includes a filter 53, which has a filter inlet, a filter outlet and a drain outlet 531. The filter inlet is connected to the outlet of the fuel channel, the filter outlet is connected to the fuel injection mechanism 20, and the drain outlet 531 can be selectively connected or disconnected with the pressure relief outlet 65. In this way, impurities in the gas fuel can be filtered through the filter 53 to ensure the cleanliness of the rear-end gas. When the drain outlet 531 is connected to the pressure relief outlet 65, impurities in the filter 53 can be removed in time to ensure the normal use of the filter 53.

[0078] Specifically, a drain valve 67 is further provided between the drain port 531 and the pressure relief outlet 65 , and the connection state between the drain port 531 and the pressure relief outlet 65 is controlled by opening and closing the drain valve 67 .

[0079] Specifically, the gas supply system further includes a differential pressure transmitter 57, one end of which is connected to the filter inlet and the other end is connected to the filter outlet, so as to detect the pressure difference of the gas fuel before and after filtering by the filter 53. When the pressure difference exceeds the limit value, the filter element of the filter 53 needs to be cleaned or replaced.

[0080] In this embodiment, the air supply system also includes a second pressure detection component 54, which is arranged on the fuel main path 50. The second pressure detection component 54 is used to detect the pressure of the fuel main path 50, so that the working state of the air supply system can be controlled according to the pressure of the fuel main path 50, thereby ensuring the safety of the air supply system.

[0081] In this embodiment, the gas supply system further includes a pressure regulating valve 56, which is disposed on the fuel main path 50 and is used to adjust the pressure of the fuel main path 50. In this way, the pressure leading to the fuel injection mechanism 20 can be adjusted by the pressure regulating valve 56, thereby ensuring that the gas fuel leading to the fuel injection mechanism 20 meets its pressure usage requirements.

[0082] In this embodiment, the air supply system further includes a third pressure detection member 71, which is disposed at the inlet of the heat exchange channel to detect the pressure value at the inlet of the heat exchange channel. In this way, the pressure of the liquid fuel at the inlet of the heat exchange channel can be detected, so as to adjust the pressure of the liquid fuel at the inlet to the heat exchange channel.

[0083] Specifically, the air supply system further includes a fuel inlet 70, one end of which is connected to the fuel tank 90, and the other end of which is connected to the inlet of the heat exchange channel. A supply valve 72 and a fuel pump 73 are provided on the fuel inlet 70, and the opening and closing of the fuel inlet 70 are controlled by the supply valve 72, and the liquid fuel in the fuel tank 90 is pumped into the heating structure 12 by the fuel pump 73. The detection part of the third pressure detection member 71 is provided on the fuel inlet 70, so that the working state of the fuel pump 73 can be controlled according to the detection result of the third pressure detection member 71.

[0084] In this embodiment, the gas supply system further includes a flow meter 55, which is disposed on the fuel main path 50 to detect the flow to the fuel injection mechanism 20. In this way, the flow of the gas fuel on the fuel main path 50 can be detected in time, so as to adjust the flow of the gas on the fuel main path 50.

[0085] Specifically, a one-way valve 58 is also provided on the fuel main path 50 to prevent the gas fuel entering the fuel injection mechanism 20 from flowing back.

[0086] Specifically, the air supply system also includes a fourth pressure detection component 21 and a second temperature detection component 22. The detection parts of the fourth pressure detection component 21 and the second temperature detection component 22 are both arranged in the fuel injection mechanism 20. In this way, the pressure and temperature in the fuel injection mechanism 20 can be detected in time to facilitate the control of the air supply system.

[0087] Specifically, the fuel control process of the gas supply system provided by this embodiment in a specific application is shown below:

[0088] After the feed valve 72 is opened, the low-temperature liquid fuel in the fuel tank 90 is transported to the heat exchange structure 11 through the fuel pump 73, where it is converted into a normal-temperature gas fuel after exchanging heat with the high-temperature medium (high-temperature heat exchange medium), and then passes through the filter 53 to remove impurities and enter the pressure regulating valve 56 for pressure regulation. After the pressure after pressure regulation meets the engine intake pressure requirement, it enters the gas fuel injection mechanism 20 through the third switch valve 52, the flow meter 55 and the one-way valve 58, and then enters the engine piston cylinder and mixes with the liquid and then burns. The filter 53 is equipped with a differential pressure transmitter, which can detect the pressure difference before and after the filter 53. When the pressure difference exceeds the limit, the control system sends a signal to replace or clean the filter element of the filter 53. In addition to real-time monitoring of the flow of natural gas, the flow meter 55 can also transmit the flow data to the control system, which analyzes and calculates the flow of gas fuel and liquid fuel, obtains the replacement rate of gas fuel to liquid fuel, and exports the data in real time. In actual operation, the fuel cost saved in each period of time compared with pure liquid fuel can be calculated based on these data, which is convenient for equipment users to manage fuel.

[0089] The third pressure detection component 71 can monitor the discharge liquid pressure of the fuel tank 90. ​​When the discharge pressure is less than the set value, the fuel tank 90 can start the automatic pressurization function to increase the pressure in the tank, thereby increasing the discharge liquid fuel pressure. The second pressure detection component 54 monitors the gas fuel pressure after pressure regulation (which can be 0.3-0.6MPa). When the pressure is lower than 0.3MPa, the control system issues an instruction to control the fuel pump 73 to increase the speed to increase the fuel supply. When the pressure after pressure regulation is higher than 0.6MPa, the control system issues an instruction to control the fuel pump 73 to reduce the speed to reduce the fuel supply. The fourth pressure detection component 21 is used to monitor the intake pressure of the gas fuel injection system. When its working pressure exceeds the normal working range, the control system issues an instruction to close the third switch valve 52, thereby cutting off the supply of gas fuel. At the same time, the engine automatically switches from the dual-fuel working state to the liquid fuel working state to avoid safety risks.

[0090] The first temperature detection element 51 detects the temperature of the gas fuel after the heat exchange structure 11, and the second temperature detection element 22 detects the temperature of the fuel entering the engine in the gas fuel injection mechanism 20, to ensure that the system temperature meets the normal use requirements of the engine after passing through the pressure regulating valve 56. The temperature range values ​​of the first temperature detection element 51 and the second temperature detection element 22 are set in the control system. When the temperature of the first temperature detection element 51 is lower than the set range value, the control system issues an instruction to open the heating structure 12 to add heat to the heat exchange structure 11. When the temperature of the first temperature detection element 51 is higher than the set range value, the control system issues an instruction to open the thermostatic valve 41, so that the low-temperature liquid fuel before the heat exchange structure 11 enters the gas fuel after the heat exchanger to reduce the temperature of the gas fuel. When the temperature of the second temperature detection element 22 is lower than or higher than the set range value, the control system issues an instruction to close the third switch valve 52, stop the gas fuel supply, and the engine operation automatically switches to the liquid fuel mode (the engine is a dual-fuel engine, and in the liquid fuel mode, the gas supply system stops supplying gas to the engine).

[0091] Specifically, the process flow of fuel vaporization heat exchange in a specific application of the gas supply system provided in this embodiment is shown below:

[0092] The heating structure 12 can be a gas heater, which heats the liquid medium (heat exchange medium) circulating in the channel by burning gas fuel. The fuel comes from the storage 31. The heated liquid medium can enter the heat exchange structure 11 to exchange heat with the liquid fuel, so that the liquid fuel is vaporized. The low-temperature liquid after heat exchange returns to the heating structure 12 to be heated and heated again for circulation. In addition, the liquid medium in the heater can enter the engine through the PT1 port, circulate in the engine and then return to the heater from the PT2 port to preheat the engine, so as to facilitate the first smooth start of the engine in winter or in cold areas. The start and stop of the heater heating structure 12 and the switch of the second switch valve 33 are interlocked. When the heater is turned on, the system controls the second switch valve 33 to open first, and after the heater is turned off, the system controls the second switch valve 33 to close.

[0093] After the engine has been running for a period of time, the temperature of the coolant inside the cooling device increases. When the set temperature value is reached, the control system sends a command to open the second switching valve 151 and close the heater heating structure 12. The high-temperature coolant in the cooling device enters the heat exchange structure 11 through the PT2 port to exchange heat with the low-temperature liquid fuel, and then returns to the cooling device through the second switching valve 151 and the PT1 port for circulation. Using the coolant of the cooling device to vaporize the liquid fuel can save the fuel consumption of the heating structure 12, thereby achieving the effect of energy saving and consumption reduction.

[0094] Specifically, the function of the storage 31 is further described as follows:

[0095] 1) As the initial starting fuel source of the engine, in cold winter conditions or when the engine is just started, the heat required for the vaporization of the liquid fuel is insufficient, and the liquid fuel is difficult to be directly supplied to the engine through vaporization. In a short period of time, gaseous fuel can be supplied from the storage 31 to the fuel injection mechanism 20 through the first switching valve 32. After the engine temperature rises, the heat exchange system can work normally and then supply fuel to the engine through the fuel tank 90.

[0096] 2) During normal operation, the gas fuel in the storage 31 can be supplied to the heating structure 12 for a short time to ensure the normal operation of the heating structure 12. The first pressure detection member 34 can monitor the working pressure in the storage 31. The storage 31 sets high and low pressure limits. When the working pressure in the storage 31 exceeds the set high pressure value, the control system issues an instruction to close the first switch valve 32 and stop supplying gas fuel to the storage 31. When the pressure in the storage is lower than the low pressure limit, the control system issues an instruction to open the first switch valve 32 to supply gas fuel to the storage 31 to ensure the normal working pressure of the storage 31.

[0097] Specifically, the safety protection system in the gas supply system provided by this embodiment is shown below:

[0098] When the pressure in the system exceeds the system setting value, the control system opens the first vent valve 612 and the second vent valve 622, and the pressure in the gas supply system is released to the outside through the flame arrester 66. The flame arrester 66 also prevents the vented gas fuel from igniting, thereby ensuring the safety of the entire system. When the first vent valve 612 and the second vent valve 622 fail to open or the pressure is not released in time, the pressure can also be automatically released through the first pressure safety valve 632 and the second pressure safety valve 642. The sewage outlet 531 of the filter 53 is also connected to the pressure relief branch 60 to prevent the discharged natural gas from posing safety risks and polluting the environment.

[0099] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: through the heating structure, the engine can be preheated to ensure that it can start normally, and the fuel can be actively heated to vaporize it when the temperature of the heat exchange medium in the cooling device is low, thereby ensuring the air supply efficiency of the air supply system.

[0100] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0101] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0102] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0103] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0104] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0105] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas supply system, characterized in that: include: A heat exchange structure (11) comprising a fuel channel and a heat exchange channel arranged at intervals, wherein the fuel channel is used to introduce fuel, the heat exchange channel is used to introduce a heat exchange medium, and the heat exchange channel is used to exchange heat with the fuel channel; An engine and a cooling device, wherein a fuel injection mechanism (20) of the engine can be selectively connected to or disconnected from an outlet of the fuel channel, the cooling device has a cooling channel, the cooling channel can be selectively connected to or disconnected from the heat exchange channel, and the cooling device is used to exchange heat with the engine; A heating structure (12) has a heating channel, and the heating structure (12) has an off state and a working state; when the heating structure (12) is in the off state, the heat exchange channel and the cooling channel are both disconnected from the heating channel, and the heat exchange channel is connected to the cooling channel; when the heating structure (12) is in the working state, the heating channel can be selectively connected to at least one of the heat exchange channel and the cooling channel.

2. The gas supply system according to claim 1, characterized in that: The gas supply system also includes: A first switching valve (131) is arranged on the first communication branch (13) between the heating channel and the first end of the heat exchange channel, and the first switching valve (131) can be opened and closed; a second switching valve (151), wherein a first communication port of the second switching valve (151) is connected to a portion of the first communication branch (13) located between the first switching valve (131) and the heating channel, and a second communication port of the second switching valve (151) is connected to an inlet of the cooling channel, and the second switching valve (151) is openably and closably arranged; The outlet of the cooling channel is connected to a second connecting branch (14) arranged between the heating channel and the second end of the heat exchange channel.

3. The gas supply system according to claim 1, characterized in that: The heating structure (12) comprises a gas heating element, The gas heating element is used to heat the heat exchange medium in the heating channel; the gas supply system also includes: A reservoir (31), wherein a first connection port (311) of the reservoir (31) can be selectively connected to or disconnected from the flow path between the fuel channel and the fuel injection mechanism (20), and a second connection port (312) of the reservoir (31) can be selectively connected to or disconnected from the gas heating element.

4. The gas supply system according to claim 3, characterized in that: The gas supply system also includes: a first switch valve (32) disposed on a flow path between the first connection port (311) and the fuel passage and the fuel injection mechanism (20); a second switch valve (33) arranged on the flow path between the second connection port (312) and the gas heating element; The storage device (31) has a gas storage state and a gas release state; when the storage device (31) is in the gas storage state, the first switch valve (32) is opened and the second switch valve (33) is closed; when the storage device (31) is in the gas release state, at least one of the first switch valve (32) and the second switch valve (33) is opened.

5. The gas supply system according to claim 3, characterized in that: The gas supply system also includes: A first pressure detection member (34), wherein a detection portion of the first pressure detection member (34) is arranged in the air storage cavity of the reservoir (31) to detect the pressure in the air storage cavity.

6. The gas supply system according to claim 1, characterized in that: The air supply system further comprises a temperature regulating branch (40), one end of the temperature regulating branch (40) being in communication with the inlet of the fuel channel, and the other end of the temperature regulating branch (40) being in communication with the outlet of the fuel channel, and the temperature regulating branch (40) having a first connected state and a first disconnected state; when the temperature regulating branch (40) is in the first connected state, the temperature regulating branch (40) is used to introduce liquid fuel into the outlet of the fuel channel; and / or, The air supply system further comprises a first temperature detection member (51), wherein a detection portion of the first temperature detection member (51) is arranged at the outlet of the fuel channel to detect the temperature at the outlet of the fuel channel.

7. The gas supply system according to claim 1, characterized in that: The air supply system further comprises a fuel main path (50), the outlet of the fuel channel and the fuel injection mechanism (20) are connected via the fuel main path (50), and the fuel main path (50) has a second connected state and a second disconnected state; The gas supply system also includes: a third switch valve (52), arranged on the fuel main path (50); A pressure relief branch (60), the pressure relief branch (60) having a first pressure relief inlet (611), a second pressure relief inlet (621) and a pressure relief outlet (65), the first pressure relief inlet (611) and the second pressure relief inlet (621) both being selectively connectable to or disconnectable from the pressure relief outlet (65); the first pressure relief inlet (611) being disposed at a position of the fuel main path (50) between the third switch valve (52) and the outlet of the fuel channel, and the second pressure relief inlet (621) being disposed at a position of the fuel main path (50) between the third switch valve (52) and the fuel injection mechanism (20).

8. The gas supply system according to claim 7, characterized in that: The pressure relief branch (60) further comprises a third pressure relief inlet (631) and a fourth pressure relief inlet (641), and the third pressure relief inlet (631) and the fourth pressure relief inlet (641) can be selectively connected to or disconnected from the pressure relief outlet (65); the third pressure relief inlet (631) is arranged at a position of the fuel main path (50) between the third switch valve (52) and the outlet of the fuel channel, and the fourth pressure relief inlet (641) is arranged at a position of the fuel main path (50) between the third switch valve (52) and the fuel injection mechanism (20); the air supply system further comprises: a first vent valve (612), disposed between the first pressure relief inlet (611) and the pressure relief outlet (65); and / or a second vent valve (622), disposed between the second pressure relief inlet (621) and the pressure relief outlet (65); and / or, a first pressure safety valve (632), arranged between the third pressure relief inlet (631) and the pressure relief outlet (65); and / or, The second pressure safety valve (642) is arranged between the fourth pressure relief inlet (641) and the pressure relief outlet (65).

9. The gas supply system according to claim 7, characterized in that: The gas supply system also includes: a flame arrester (66), arranged at the pressure relief outlet (65); and / or, A filter (53), wherein the filter (53) has a filter inlet, a filter outlet and a drain outlet (531), wherein the filter inlet is connected to the outlet of the fuel channel, the filter outlet is connected to the fuel injection mechanism (20), and the drain outlet (531) can be selectively connected to or disconnected from the pressure relief outlet (65).

10. The gas supply system according to claim 7, characterized in that: The gas supply system also includes: a second pressure detection component (54), arranged on the fuel main path (50), the second pressure detection component (54) being used to detect the pressure of the fuel main path (50); and / or, a pressure regulating valve (56), arranged on the main fuel path (50), the pressure regulating valve (56) being used to regulate the pressure of the main fuel path (50); and / or, a third pressure detection member (71), arranged at the inlet of the heat exchange channel, to detect the pressure value at the inlet of the heat exchange channel; and / or, A flow meter (55) is provided on the fuel main path (50) to detect the flow rate to the fuel injection mechanism (20).

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