Pneumatic system of diesel engine

Abstract

The utility model discloses a pneumatic system of a diesel engine, which belongs to the technical field of diesel engines and is characterized in that an air storage tank is connected with one end of a filter, the air storage tank and the filter are connected with a filtering detection device, and the other end of the filter is connected with air inlets of a first valve and a fourth valve; a first air outlet of the first valve is connected with an air inlet of the second valve, a second air outlet of the first valve is connected with a first air inlet of the control valve, the control valve is connected with the pneumatic control motor, and the second valve is connected with the pneumatic control motor. By means of the mode, the air filtering and purifying effects are achieved through the filter, the air is detected through the air detection device, and the performance of the filter and the air quality are ensured; the flywheel of the diesel engine is protected by setting the rotating speed threshold value, the diesel engine is protected again through the diesel engine protection device when the rotating speed of the diesel engine is out of control, the structure is simple, and work is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engines, in particular to a pneumatic system for a diesel engine. Background Art

[0002] The pneumatic starting of a diesel engine is a starting method that uses high-pressure gas to push the piston of the diesel engine to start the diesel engine. It mainly consists of a gas source, a control system, a starting motor, and a diesel engine. When the air pressure reaches the set value, the compressed air in the gas source will be sent into the control system. The control system pushes the gas into the starting motor and guides the starting motor to push the piston of the diesel engine to make it start to rotate. When the speed of the diesel engine increases to a certain extent, the diesel engine can already work by itself. At this time, the pneumatic starting device can be automatically closed.

[0003] For example, Chinese Patent CN217270570U discloses a multifunctional pneumatic system for a diesel engine, which has an air motor connected to the pipeline inlet A; a filter for filtering compressed air is arranged between the air motor and the pipeline inlet A; the filter is electrically connected to a control device for monitoring the throttle position change rate signal and the diesel engine speed signal through a two-position two-way solenoid valve; the control device is connected to the built-in valve of the air motor through a cable; the other path of the two-position two-way solenoid valve is connected to a supercharger; the filter is also connected to a two-position three-way solenoid valve; the two-position three-way solenoid valve is electrically connected to the control device, and the other path is connected to a high-pressure oil pump group.

[0004] However, its technology has the following problems. The filter plays a crucial role in the life of the diesel engine. The performance of the filter will be damaged after long-term use. The above technology cannot detect the performance of the filter and replace it after damage.

[0005] Based on this, the utility model designs a pneumatic system for a diesel engine to solve the above problems. Summary of the Utility Model

[0006] In view of the above-mentioned drawbacks of the prior art, the utility model provides a pneumatic system for a diesel engine.

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions:

[0008] A pneumatic system for a diesel engine, comprising a controller and an air storage tank. One end of the air storage tank is connected to a filter, and an exhaust valve is fixedly installed at the exhaust port of the air storage tank. The air storage tank and the filter are both connected to a filtration detection device. The other end of the filter is connected to the inlets of a first valve and a fourth valve. The first outlet of the first valve is connected to the inlet of a second valve, and the second outlet of the first valve is connected to the first inlet of a control valve. The outlet of the control valve is connected to the inlet of a pneumatic control motor. The outlet of the second valve is connected to the pre-engaged gear inlet of the pneumatic control motor. The pre-engaged gear outlet of the pneumatic control motor is connected to the control valve;

[0009] The driving end of the pneumatic control motor is connected to the control end of the diesel engine. The outlet of the fourth valve is connected to a diesel engine protection device, and the diesel engine protection device is connected to the diesel engine.

[0010] The filtration detection device includes a first gas detection device, a second gas detection device, an air pump, a spare filter, and an air pump driver. The first gas detection device is fixedly installed inside the air storage tank. The second gas detection device is fixedly installed inside the pipeline between the filter and the first valve. The inlet of the air pump is connected to the pipeline between the filter and the first valve. The outlet of the air pump is connected to the inlet of the spare filter. The inlet of the spare filter is connected to the pipeline between the air storage tank and the filter. The output end of the air pump driver is electrically connected to the control end of the air pump.

[0011] Furthermore, the liquid outlet of the diesel engine is connected to the liquid inlet of a hydraulic oil pump. The liquid outlet of the hydraulic oil pump is connected to the liquid inlet of a check valve. The control end of the hydraulic oil pump is electrically connected to the output end of an oil pump driver. The liquid inlet of the second valve is connected to the liquid outlet of the check valve.

[0012] Furthermore, both the first gas detection device and the second gas detection device are gas detectors.

[0013] Furthermore, the first valve is a two-position two-way solenoid valve.

[0014] Furthermore, the second valve is a two-position three-way hydraulic directional control valve.

[0015] Furthermore, the diesel engine protection device includes a fan, a fifth valve, an electric valve, and an exhaust pipe. One end of the exhaust pipe is connected to the exhaust port of the diesel engine, and the other end of the exhaust pipe is connected to the electric valve. The electric valve is connected to both the fourth valve and the fifth valve. The fifth valve is connected to the fan.

[0016] Furthermore, the first gas detection device, the second gas detection device, the air pump driver, the first valve, the second valve, the fourth valve, the oil pump driver, the supercharger, the electric valve, the fifth valve, and the fan are all electrically connected to the controller.

[0017] Further, both the fourth valve and the fifth valve are solenoid valves.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model realizes the filtration and purification of air through the filter, and detects the air through the first gas detection device and the second gas detection device to ensure the performance of the filter and the air quality; the present utility model protects the flywheel of the diesel engine by setting a rotational speed threshold, and when the rotational speed of the diesel engine gets out of control, the diesel engine is protected again by the diesel engine protection device, with a simple structure and reliable operation. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 It is a block diagram of a pneumatic system of a diesel engine of the present utility model;

[0021] Figure 2 It is a block diagram of a filter detection device of the present utility model;

[0022] Figure 3 It is a block diagram of a diesel engine protection device of the present utility model;

[0023] Figure 4 It is a connection block diagram of a controller of the present utility model.

[0024] The reference numerals in the drawings respectively represent:

[0025] 1, air storage tank; 2, filter; 3, filter detection device; 31, first gas detection device; 32, second gas detection device; 33, air pump; 34, standby filter; 35, air pump driver; 4, first valve; 5, second valve; 6, control valve; 7, fourth valve; 8, pneumatic control motor; 9, diesel engine; 10, oil pump driver; 11, hydraulic oil pump; 12, check valve; 13, diesel engine protection device; 131, fan; 132, fifth valve; 133, electric valve; 134, exhaust pipe; 14, exhaust valve; 15, supercharger. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment 1: In some embodiments, please refer to Figures 1-4 of the accompanying drawings of the specification. A pneumatic system for a diesel engine includes a controller and an air storage tank 1. One end of the air storage tank 1 is connected to a filter 2. An exhaust valve 14 is fixedly installed at the exhaust port of the air storage tank 1. Both the air storage tank 1 and the filter 2 are connected to a filter detection device 3. The other end of the filter 2 is connected to the intake ports of a first valve 4 and a fourth valve 7. The first air outlet of the first valve 4 is connected to the intake port of a second valve 5. The second air outlet of the first valve 4 is connected to the first intake port of a control valve 6. The air outlet of the control valve 6 is connected to the intake port of a pneumatic control motor 8. The air outlet of the second valve 5 is connected to the gear pre-engagement intake port of the pneumatic control motor 8. The gear pre-engagement air outlet of the pneumatic control motor 8 is connected to the control valve 6.

[0028] The driving end of the pneumatic control motor 8 is connected to the control end of the diesel engine 9. The air outlet of the fourth valve 7 is connected to a diesel engine protection device 13, and the diesel engine protection device 13 is connected to the diesel engine 9.

[0029] The filter detection device 3 includes a first gas detection device 31, a second gas detection device 32, an air pump 33, a spare filter 34, and an air pump driver 35. The first gas detection device 31 is fixedly installed inside the air storage tank 1. The second gas detection device 32 is fixedly installed inside the pipeline between the filter 2 and the first valve 4. The intake port of the air pump 33 is connected to the pipeline between the filter 2 and the first valve 4. The air outlet of the air pump 33 is connected to the intake port of the spare filter 34. The intake port of the spare filter 34 is connected to the pipeline between the air storage tank 1 and the filter 2. The output end of the air pump driver 35 is electrically connected to the control end of the air pump 33.

[0030] The present utility model realizes the filtering and purification of air through the filter 2, and detects the air through the first gas detection device 31 and the second gas detection device 32 to ensure the performance of the filter 2 and the air quality. The present utility model protects the flywheel of the diesel engine 9 by setting a rotational speed threshold, and when the rotational speed of the diesel engine 9 gets out of control, the diesel engine protection device 13 protects the diesel engine 9 again. The structure is simple and the work is reliable.

[0031] The liquid outlet of the diesel engine 9 is connected to the liquid inlet of the hydraulic oil pump 11. The liquid outlet of the hydraulic oil pump 11 is connected to the liquid inlet of the one-way valve 12. The control end of the hydraulic oil pump 11 is electrically connected to the output end of the oil pump driver 10. The liquid inlet of the second valve 5 is connected to the liquid outlet of the one-way valve 12.

[0032] The first gas detection device 31 and the second gas detection device 32 are both gas detectors.

[0033] The first valve 4 is a two-position two-way solenoid valve.

[0034] The first valve 4 is connected with a supercharger 15. The supercharger 15 can improve the transient performance of the diesel engine. After entering the normal working condition, the first valve 4 is powered off and the valve closes to realize the air supplement function.

[0035] The second valve 5 is a two-position three-way hydraulic directional control valve.

[0036] The diesel engine protection device 13 includes a blower 131, a fifth valve 132, an electric valve 133 and an exhaust pipe 134. One end of the exhaust pipe 134 is connected to the exhaust port of the diesel engine 9, and the other end of the exhaust pipe 134 is connected to the electric valve 133. The electric valve 133 is connected to the fourth valve 7 and the fifth valve 132, and the fifth valve 132 is connected to the blower 131.

[0037] The first gas detection device 31, the second gas detection device 32, the air pump driver 35, the first valve 4, the second valve 5, the fourth valve 7, the oil pump driver 10, the supercharger 15, the electric valve 133, the fifth valve 132 and the blower 131 are all electrically connected to the controller.

[0038] The fourth valve 7 and the fifth valve 132 are both solenoid valves.

[0039] When the present utility model is in use, the first gas detection device 31 first detects the air quality in the gas storage tank 1. After the gas in the gas storage tank 1 is filtered by the filter 2, the second gas detection device 32 detects the air quality again. There are two purposes for the second gas detection device 32 to detect the air quality: First, to detect whether the air quality after being filtered by the filter 2 meets the standard; Second, to compare the results of the two detections by the first gas detection device 31 and the second gas detection device 32 to test the filtering efficiency of the filter 2.

[0040] If the second gas detection device 32 detects that the air quality after being filtered by the filter 2 does not meet the standard, the air pump 33 is started, and the air pump 33 sucks in air and conducts secondary filtration in the spare filter 34.

[0041] If the first gas detection device 31 and the second gas detection device 32 detect that the filtration efficiency of the filter 2 has decreased below the threshold set by the system, it indicates that the filter 2 is damaged, and at this time, the filter 2 needs to be replaced;

[0042] After filtration, the air is divided into two paths;

[0043] The first path: After the gas passes through the first valve 4, it is divided into two paths and enters the second valve 5 and the control valve 6 respectively. The gas enters the air inlet of the pneumatic control motor 8 through the control valve 6, and the gas enters the pre-engagement air inlet of the gear of the pneumatic control motor 8 through the second valve 5, thereby controlling the gear of the pneumatic control motor 8 to engage with the flywheel of the diesel engine 9, thus controlling the start of the diesel engine 9;

[0044] The gas discharged from the pre-engagement air outlet of the gear of the pneumatic control motor 8 enters the control valve 6 again to control the opening of the control valve 6;

[0045] However, when the rotational speed of the diesel engine 9 reaches the rotational speed threshold set in the system, the controller controls the oil pump driver 10 to drive the hydraulic oil pump 11 to extract the engine oil in the diesel engine 9. The engine oil enters the second valve 5 through the one-way valve 12, thereby cutting off the control air path of the second valve 5, closing the control valve 6, so that the gear of the pneumatic control motor 8 is disengaged from the flywheel of the diesel engine 9, realizing the protection of the gear of the pneumatic control motor 8, preventing the diesel engine 9 from rotating too fast and causing damage to the diesel engine 9 itself and the gear of the pneumatic control motor 8, and realizing the starting function of the diesel engine 9;

[0046] The second path: When the diesel engine 9 has a runaway speed phenomenon and the first path cannot disengage the gear of the pneumatic control motor 8 from the flywheel of the diesel engine 9, the fourth valve 7 opens and the fifth valve 132 closes. The gas enters the exhaust pipe 134 through the fourth valve 7, quickly increasing the pressure in the exhaust pipe 134 to achieve exhaust pressure braking, so that the diesel engine 9 quickly shuts down, protecting the diesel engine 9. The structure is simple and the work is reliable;

[0047] When the diesel engine 9 is working normally, the fourth valve 7 is normally closed, the fifth valve 132 is normally open, and the exhaust gas of the diesel engine 9 is normally discharged through the exhaust pipe 134, the electric valve 133, the fifth valve 132, and the fan 131.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diesel engine pneumatic system, comprising a controller and an air storage tank (1), characterized in that, The gas storage tank (1) is connected to one end of the filter (2). An exhaust valve (14) is fixedly installed at the exhaust port of the gas storage tank (1). Both the gas storage tank (1) and the filter (2) are connected to the filter detection device (3). The other end of the filter (2) is connected to the inlets of a first valve (4) and a fourth valve (7). The first outlet of the first valve (4) is connected to the inlet of a second valve (5). The second outlet of the first valve (4) is connected to the first inlet of a control valve (6). The outlet of the control valve (6) is connected to the inlet of a pneumatic control motor (8). The outlet of the second valve (5) is connected to the pre-engaged gear inlet of the pneumatic control motor (8). The pre-engaged gear outlet of the pneumatic control motor (8) is connected to the control valve (6). The driving end of the pneumatic control motor (8) is connected to the control end of a diesel engine (9). The outlet of the fourth valve (7) is connected to a diesel engine protection device (13). The diesel engine protection device (13) is connected to the diesel engine (9). The filter detection device (3) includes a first gas detection device (31), a second gas detection device (32), an air pump (33), a spare filter (34), and an air pump driver (35). The first gas detection device (31) is fixedly installed inside the gas storage tank (1). The second gas detection device (32) is fixedly installed inside the pipeline between the filter (2) and the first valve (4). The inlet of the air pump (33) is connected to the pipeline between the filter (2) and the first valve (4). The outlet of the air pump (33) is connected to the inlet of the spare filter (34). The inlet of the spare filter (34) is connected to the pipeline between the gas storage tank (1) and the filter (2). The output end of the air pump driver (35) is electrically connected to the control end of the air pump (33).

2. The diesel engine pneumatic system according to claim 1, characterized in that, The liquid outlet of the diesel engine (9) is connected to the liquid inlet of a hydraulic oil pump (11). The liquid outlet of the hydraulic oil pump (11) is connected to the liquid inlet of a check valve (12). The control end of the hydraulic oil pump (11) is electrically connected to the output end of an oil pump driver (10). The inlet of the second valve (5) is connected to the outlet of the check valve (12).

3. The diesel engine pneumatic system according to claim 2, characterized in that, Both the first gas detection device (31) and the second gas detection device (32) are gas detectors.

4. The diesel engine pneumatic system according to claim 3, characterized in that, The first valve (4) is a two-position two-way solenoid valve.

5. The diesel engine pneumatic system according to claim 4, characterized in that, The second valve (5) is a two-position three-way hydraulic directional control valve.

6. The diesel engine pneumatic system according to claim 5, characterized in that, The diesel engine protection device (13) includes a fan (131), a fifth valve (132), an electric valve (133), and an exhaust pipe (134). One end of the exhaust pipe (134) is connected to the exhaust port of the diesel engine (9). The other end of the exhaust pipe (134) is connected to the electric valve (133). The electric valve (133) is connected to both the fourth valve (7) and the fifth valve (132). The fifth valve (132) is connected to the fan (131).

7. The diesel engine pneumatic system according to claim 6, characterized in that, The first gas detection device (31), the second gas detection device (32), the air pump driver (35), the first valve (4), the second valve (5), the fourth valve (7), the oil pump driver (10), the supercharger (15), the electric valve (133), the fifth valve (132), and the blower (131) are all electrically connected to the controller.

8. The diesel engine pneumatic system according to claim 7, characterized in that, Both the fourth valve (7) and the fifth valve (132) are solenoid valves.

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