New energy fuel injector system with automatic purging function

Abstract

The utility model belongs to the technical field of fuel injection, and particularly discloses a new energy fuel injector system with an automatic purging function, which comprises a master control unit, an injector, a purging control unit and a supply unit, the injector, the purging control unit and the supply unit are connected with the master control unit, and the supply unit is used for supplying new energy fuel or purging gas into the injector; the ejector is provided with a purging gas outlet communicated with a fuel runner in the ejector, opening and closing of the purging gas outlet are controlled by the purging control valve, and the purging control unit is used for opening and closing the purging control valve; the supply unit comprises a first reversing valve connected with the master control unit, and two inlets of the first reversing valve are connected with the purge gas storage unit and the fuel storage unit respectively; and an outlet of the first reversing valve is connected with a feeding hole of the ejector. Fuel injection and purging are controlled in a centralized mode through the master control unit, automatic switching can be carried out only through connection reversing of the first reversing valve, and the structure is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel injection, and in particular relates to a new energy fuel injector system with an automatic purge function. Background Art

[0002] New energy fuels, such as methanol and ammonia fuel, are preferred green alternative energy sources for internal combustion engines and can effectively reduce pollutant emissions. When the injector needs to be maintained, the residual new energy fuel in the high-pressure gas flow channel in the injector needs to be cleaned. A purge unit is usually used for purging. The purge unit generally includes a purge channel and a purge valve. After the purge valve is opened, the purge gas will enter the injector through the purge channel to purge the new energy fuel. The purge unit and the fuel supply unit are separately arranged and need to be controlled separately, resulting in a more complex structure of the entire injector system. Utility Model Content

[0003] The purpose of the utility model is to provide a new energy fuel injector system with an automatic purge function to solve the problem in the prior art that the purge unit and the fuel supply unit are separately arranged and need to be controlled separately, resulting in a relatively complex structure of the entire injector system.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a new energy fuel injector system with automatic purge function, comprising a general control unit, and an injector, a purge control unit and a supply unit connected to the general control unit, the supply unit being used to supply new energy fuel or purge gas into the injector; the injector is provided with a purge gas outlet connected to the internal fuel flow channel of the injector, the opening and closing of the purge gas outlet is controlled by a purge control valve, and the purge control unit is used to open and close the purge control valve; the supply unit comprises a first reversing valve connected to the general control unit, the two inlets of the first reversing valve are respectively connected to the purge gas storage unit and the fuel storage unit; the outlet of the first reversing valve is connected to the feed port of the injector.

[0005] Furthermore, the purge control unit includes a second reversing valve connected to the main control unit, and two inlets of the second reversing valve are respectively connected to the outside atmosphere and the compressed gas unit; the compressed gas of the compressed gas unit is used to open the purge control valve; and the outlet of the second reversing valve is connected to the purge control valve.

[0006] Furthermore, the compressed gas unit comprises an air compressor, and an outlet of the air compressor is connected to an inlet of the second reversing valve.

[0007] Furthermore, a pressure regulating valve is connected to the connecting pipe between the outlet of the air compressor and an inlet of the second reversing valve, and the pressure regulating valve is used to adjust the pressure of the compressed air entering the second reversing valve.

[0008] Furthermore, a pressure gauge is provided between the pressure regulating valve and the second reversing valve.

[0009] Furthermore, the purge gas outlet is connected to a fuel recovery unit.

[0010] Furthermore, the fuel recovery unit comprises a fuel collecting device and a check valve, and a check valve is provided on a connecting pipe between the fuel collecting device and the purge gas outlet.

[0011] Furthermore, the first reversing valve and the second reversing valve are both electromagnetic reversing valves.

[0012] The working principle of this technical solution is:

[0013] (1) Fuel injection mode

[0014] During fuel injection, the first reversing valve connected to the feed port of the injector is connected to the fuel storage unit in the default state, and the fuel enters the injector through the first reversing valve. At this time, the second reversing valve is connected to the outside atmosphere, the purge control valve is in a closed state, and the fuel recovery unit is disconnected from the injector. The high-pressure fuel flow channel of the injector becomes a closed space, so that the fuel pressure in the injector can be established and gradually increased. The main control unit controls the injector needle valve to open the sealing surface, and the nozzle opens to inject fuel. When the injector injection time reaches the setting value of the main control unit, the needle valve seats and closes the sealing surface, and the nozzle is closed, completing one injection.

[0015] (2) Purge ejector mode

[0016] When the injector needs to be maintained, the residual new energy fuel in the high-pressure fuel flow channel of the injector needs to be cleared first. This system uses purge gas to remove the residual fuel in the injector. For example, the commonly used purge gas is nitrogen. When the injector needs to be purged, the main control unit controls the first reversing valve to reverse, and the injector is disconnected from the fuel storage unit and connected to the purge gas storage unit. At the same time, the second reversing valve controlled by the main control unit is reversed, disconnecting the connection with the outside atmosphere, connecting the compressed gas unit, and the compressed air enters the purge control valve. The purge control valve is opened to connect the injector to the fuel recovery unit, thereby forming a passage for the purge gas through the first reversing valve, the injector, the purge control valve and the fuel recovery unit. The purge gas carries the residual new energy fuel in the fuel flow channel inside the injector and is discharged from the purge gas outlet to the fuel collection device to complete the injector purge.

[0017] The beneficial effects of this technical solution are:

[0018] ① The injector system of the present technical solution has an automatic purge function. Both fuel injection and purge are centrally controlled by the main control unit, and only the first reversing valve needs to be connected to perform automatic switching, and the structure is simple.

[0019] ② In this technical solution, the second reversing valve can automatically switch between compressed air and the outside atmosphere to realize the control of the opening and closing of the purge control valve on the ejector.

[0020] ③ In this technical solution, the fuel flow channel and the purge gas flow channel are exactly the same, that is, the purge gas can cover all places in contact with the fuel, and the injector can be purged without dead ends, and there is no part that cannot be purged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a new energy fuel injector system with automatic purge function according to the utility model. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The figure marks in the drawings of the specification include: injector 1, main control unit 2, purge control unit 3, supply unit 4, fuel recovery unit 5, first reversing valve 6, purge gas storage unit 7, fuel storage unit 8, air compressor 9, pressure regulating valve 10, second reversing valve 11, pressure gauge 12, outside atmosphere 13, check valve 14, fuel collection device 15.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The embodiment is basically as shown in the attached Figure 1As shown: A new energy fuel injector system with automatic purge function, including a general control unit 2 (specifically an ECU controller), and an injector 1 connected to the general control unit 2, a purge control unit 3, and a supply unit 4, wherein the supply unit 4 is used to supply new energy fuel or purge gas into the injector 1. The injector 1 is provided with a purge gas outlet connected to the internal fuel flow channel of the injector 1, and the opening and closing of the purge gas outlet is controlled by a purge control valve. The purge control unit 3 is used to open and close the purge control valve, and the purge control valve can specifically be an air-open valve. The purge gas outlet is connected to a fuel recovery unit 5, and the fuel recovery unit 5 includes a fuel collection device 15 and a check valve 14, and a check valve 14 is provided on the connecting pipe between the fuel collection device 15 and the purge gas outlet.

[0026] The supply unit 4 includes a first reversing valve 6 (specifically an electromagnetic reversing valve) connected to the main control unit 2, and the two inlets of the first reversing valve 6 are respectively connected to the purge gas storage unit 7 and the fuel storage unit 8; the outlet of the first reversing valve 6 is connected to the feed port of the injector 1.

[0027] The purge control unit 3 includes a second reversing valve 11 (specifically, an electromagnetic reversing valve) connected to the main control unit 2. The two inlets of the second reversing valve 11 are respectively connected to the outside atmosphere 13 and the compressed gas unit; the compressed gas of the compressed gas unit is used to open the purge control valve. The outlet of the second reversing valve 11 is connected to the purge control valve. The compressed gas unit includes an air compressor 9, and the outlet of the air compressor 9 is connected to an inlet of the second reversing valve 11. A pressure regulating valve 10 is connected to the connecting pipeline between the outlet of the air compressor 9 and an inlet of the second reversing valve 11. The pressure regulating valve 10 is used to adjust the pressure of the compressed air entering the second reversing valve 11 to match the opening pressure of the purge control valve. A pressure gauge 12 is also provided between the pressure regulating valve 10 and the second reversing valve 11.

[0028] The specific implementation process is as follows:

[0029] (1) Fuel injection mode

[0030] During fuel injection, the first reversing valve 6 connected to the feed port of the injector 1 is connected to the fuel storage unit 8 in the default state, and the fuel enters the injector 1 through the first reversing valve 6. At this time, the second reversing valve 11 is connected to the outside atmosphere 12, the purge control valve is in a closed state, and the fuel recovery unit 5 is disconnected from the injector 1. The high-pressure fuel flow channel of the injector 1 becomes a closed space, so that the fuel pressure in the injector 1 can be established and gradually increased. The main control unit 2 controls the needle valve of the injector 1 to open the sealing surface, and the nozzle opens to inject fuel. When the injection time of the injector 1 reaches the setting value of the main control unit 2, the needle valve seats to close the sealing surface, the nozzle is closed, and one injection is completed.

[0031] (2) Purge ejector 1 mode

[0032] When it is necessary to maintain the injector 1, it is necessary to first clear the residual new energy fuel in the high-pressure fuel flow channel of the injector 1. This system uses purge gas to remove the residual fuel in the injector 1, for example, the commonly used purge gas is nitrogen. When it is necessary to purge the injector 1, the main control unit 2 controls the first reversing valve 6 to reverse, and the injector 1 is disconnected from the fuel storage unit 8 and connected to the purge gas storage unit 7. At the same time, the second reversing valve 11 controlled by the main control unit 2 is reversed, disconnected from the outside atmosphere 13, connected to the compressed gas unit, compressed air enters the purge control valve, and the purge control valve is opened, so that the injector 1 is connected to the fuel recovery unit 5, thereby the purge gas forms a passage through the first reversing valve 6, the injector 1, the purge control valve and the fuel recovery unit 5, and the purge gas carries the residual new energy fuel in the internal fuel flow channel of the injector 1 and is discharged from the purge gas outlet to the fuel collection device 15, completing the purge of the injector 1.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A new energy fuel injector system with automatic purge function, characterized in that: The invention comprises a general control unit (2), an injector (1) connected to the general control unit (2), a purge control unit (3) and a supply unit (4), wherein the supply unit (4) is used to supply new energy fuel or purge gas into the injector (1); the injector (1) is provided with a purge gas outlet connected to an internal fuel flow channel of the injector (1), the opening and closing of the purge gas outlet is controlled by a purge control valve, and the purge control unit (3) is used to open and close the purge control valve; the supply unit (4) comprises a first reversing valve (6) connected to the general control unit (2), the two inlets of the first reversing valve (6) are respectively connected to a purge gas storage unit (7) and a fuel storage unit (8); the outlet of the first reversing valve (6) is connected to a feed port of the injector (1).

2. A new energy fuel injector system with automatic purge function according to claim 1, characterized in that: The purge control unit (3) comprises a second reversing valve (11) connected to the main control unit (2); two inlets of the second reversing valve (11) are respectively connected to the outside atmosphere (13) and a compressed gas unit; the compressed gas of the compressed gas unit is used to open the purge control valve; and the outlet of the second reversing valve (11) is connected to the purge control valve.

3. A new energy fuel injector system with automatic purge function according to claim 2, characterized in that: The compressed gas unit comprises an air compressor (9), the outlet of the air compressor (9) being connected to an inlet of the second reversing valve (11).

4. The new energy fuel injector system with automatic purge function according to claim 3, characterized in that: A pressure regulating valve (10) is connected to a connecting pipe between the outlet of the air compressor (9) and an inlet of the second reversing valve (11), and the pressure regulating valve (10) is used to adjust the pressure of the compressed air entering the second reversing valve (11).

5. A new energy fuel injector system with automatic purge function according to claim 4, characterized in that: A pressure gauge (12) is also provided between the pressure regulating valve (10) and the second reversing valve (11).

6. The new energy fuel injector system with automatic purge function according to claim 1, characterized in that: The purge gas outlet is connected to a fuel recovery unit (5).

7. A new energy fuel injector system with automatic purge function according to claim 6, characterized in that: The fuel recovery unit (5) comprises a fuel collection device (15) and a check valve (14); the check valve (14) is provided on a connecting pipe between the fuel collection device (15) and a purge gas outlet.

8. The new energy fuel injector system with automatic purge function according to claim 2, characterized in that: The first reversing valve (6) and the second reversing valve (11) are both electromagnetic reversing valves.

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