Smoke spraying pressure balanced range hood and control method thereof

Abstract

The invention provides a range hood with balanced smoke spraying pressure and a control method thereof, and the range hood comprises an oil barrel used for storing tobacco tar required by atomization; the electromagnetic pump set is connected with the oil drum through an oil inlet pipe and provides sufficient pressure for smoke spraying; the electromagnetic valve control module is connected with the electromagnetic pump set through a first oil outlet pipe, a pressure sensor is arranged at the joint of the electromagnetic valve control module and the electromagnetic pump set, and the electromagnetic valve control module is connected with an oil barrel through an oil return pipe and used for controlling the smoke spraying pressure of the range hood and tobacco tar backflow; the heater is used for converting the tobacco tar into smoke; the energy storage device is connected with the interior of the electromagnetic valve control module and is used for temporarily storing tobacco tar with high pressure; the electromagnetic valve control module comprises an injection molding electromagnetic valve, a working electromagnetic valve, a pressure relief electromagnetic valve, a backflow electromagnetic valve and an electromagnetic valve body. The range hood can spray smoke rapidly and stop after being closed, the smoke spraying effect is high in consistency, and the arranged electromagnetic valve control module is simple in structure, free of complex pipelines and very convenient and rapid to assemble and maintain.

Description

Technical Field

[0001] The invention relates to the field of smoke machines, and in particular to a smoke machine with balanced smoke spraying pressure and a control method thereof. Background Art

[0002] The stage smoke machine is a device that allows smoke oil, which contains chemical components that can quickly vaporize after being heated at high temperatures, to pass through a high-temperature heating tube quickly to form white vaporous smoke and spray it out, thereby achieving a certain stage beauty effect. In some entertainment venues, such as various theaters, large studios, mobile performances, cultural groups, fashion shows, exhibitions, entertainment clubs, etc., it is often necessary to create a stage effect of air columns. The smoke machine can make consumables such as smoke oil into columnar smoke, similar to the effect of a carbon dioxide gas column, to improve the stage performance effect.

[0003] The commonly used gas column smoke machines on the market usually use an electromagnetic pump to directly or regularly inject oil into the heater. There is no pressure sensor and the pressure is estimated. However, the smoke column of this solution is affected by the starting flow rate and response time of the electromagnetic pump and the reverse pressure of the heater during injection. The smoke column injection will lack explosive power and will show a trend of gradually weakening. It is also unstable and cannot achieve an explosive stage effect. Summary of the invention

[0004] In view of the technical defects existing in the background technology, the present invention proposes a smoke exhaust fan with balanced smoke spray pressure and a control method thereof, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A smoke exhaust fan with balanced smoke spray pressure, comprising:

[0006] Oil barrel, used to store the smoke oil required for atomization;

[0007] The electromagnetic pump group is connected to the oil drum through the oil inlet pipe to provide sufficient pressure for the energy accumulator;

[0008] The solenoid valve control module is connected to the solenoid pump group through the first oil outlet pipe and a pressure sensor is provided at the connection point. It is connected to the oil drum through the oil return pipe and is used to control the smoke spray pressure of the smoke machine and the return flow of smoke oil;

[0009] A heater, used to convert the e-liquid into smoke;

[0010] The energy storage device is directly connected to the pressure sensor through the solenoid valve control module and is used to temporarily store the high-pressure smoke oil;

[0011] The solenoid valve control module includes an injection solenoid valve, a smoke spray working solenoid valve, a pressure relief solenoid valve, a reflux solenoid valve and a solenoid valve body. The combined solenoid valve body is respectively provided with an A port, a B port, a C port, a D port and an E port. The injection solenoid valve is respectively connected to the first oil outlet pipe, the pressure sensor and the accumulator through the A port, the B port and the E port. The B port is used to install the pressure sensor and is directly connected to the accumulator. The outlet of the smoke spray working solenoid valve is connected to the external heater through the internal connection C port, and the inlet is connected to the outlet of the injection solenoid valve through the inside of the valve body; the inlet of the reflux solenoid valve is directly connected to the C port through the inside of the valve body, and the outlet is connected to the D port through the inside of the valve body.

[0012] Furthermore, the energy storage device is a nitrogen-filled energy storage device.

[0013] Furthermore, a first tee is provided at the connection between the electromagnetic pump group and the first oil outlet pipe.

[0014] Furthermore, a second oil outlet pipe is provided at the connection between the outlet B of the smoke spraying solenoid valve and the heater.

[0015] Furthermore, a second tee is provided at the connection between the second oil outlet pipe and the heater.

[0016] Furthermore, the electromagnetic pump group is one or two electromagnetic pumps (or gear pumps).

[0017] Furthermore, the outlet D of the reflux solenoid valve is connected to the oil barrel through an oil return pipe.

[0018] Furthermore, the heater may be a single oil inlet pipe heater. When a single oil inlet pipe heater is used, the second tee and the second oil outlet pipe may be eliminated, and port C may be directly connected to the oil inlet pipe of the heater.

[0019] Furthermore, the energy accumulator and the pressure sensor are directly connected internally, and the assembly positions can be interchanged according to the space requirements of the assembly structure, that is, the B port of the solenoid valve control module can also be connected to the energy accumulator, and the E port can also be connected to the pressure sensor.

[0020] A control method, applicable to a smoke exhaust fan with balanced smoke spray pressure, comprising:

[0021] Step S1, turn on the power of the range hood, the heater enters the preheating state, open the pressure relief solenoid valve, and at this time, other valves are closed, and the smoke oil stored in the energy storage device is returned to the oil barrel through the D port and the return oil pipe; this step is used to detect whether there is oil in the oil barrel through the pressure change in step S2, and the failure of pressurization can be determined as insufficient oil or lack of oil in the oil barrel;

[0022] Step S2, after the pressure relief is completed, the pressure relief solenoid valve is closed, and the pressure injection solenoid valve and the solenoid pump group are opened. At this time, the other valves are closed and the pressure boosting mode is entered. The solenoid pump group injects the tobacco oil from the A port through the E port into the energy storage end of the E port of the solenoid valve control module and the pressure sensor end of the B port of the solenoid valve control module. When the pressure sensor detects that the pressure reaches a preset pressure value, the pressure injection solenoid valve and the solenoid pump group are closed, and the pressure boosting is completed; if the pressure boosting fails, it can be determined that there is insufficient oil in the oil barrel or there is no oil (no oil detection); if the pressure boosting fails within the rated time, the system closes the pressure injection solenoid valve (7) and the solenoid pump group (2) to protect the solenoid pump well to prevent damage due to long-term no-load;

[0023] Step S3, when the heating is completed and the smoke spraying instruction is received, the smoke spraying working solenoid valve is opened to enter the smoke spraying mode, and the high-pressure smoke oil in the energy storage device is released from the C port through the second oil outlet pipe and the second three-way device into the heater for vaporization and smoke spraying. After the preset spraying time is reached, the working solenoid valve is closed and the smoke spraying ends; during this smoke spraying process, the pressure drops and the injection solenoid valve and the electromagnetic pump group are automatically opened to ensure that the pressure of the energy storage device is constant; during the smoke spraying process, except for the smoke spraying working solenoid valve, the injection solenoid valve and the electromagnetic pump group, other valves are closed;

[0024] Step S4, after the smoke spraying is finished, the reflux solenoid valve is opened. At this time, the smoke spraying solenoid valve and the pressure relief solenoid valve are both in the closed state. The smoke oil in the heater pipe will flow from port C to port D due to the reverse pressure and flow back into the oil barrel, achieving the effect of stopping immediately after closing;

[0025] The pressure injection solenoid valve and solenoid pump group are limited to maintaining a constant pressure after the pressure relief is completed each time the power is turned on. They will automatically open when the pressure decreases or is insufficient, and have nothing to do with other states.

[0026] Note: The liquid oil flow diagrams in each step are only schematic diagrams, used to illustrate the direction of the fluid inlet and outlet in each state, and are not the actual structure inside the actual valve body.

[0027] Compared with the prior art, the smoke exhaust fan with balanced smoke spray pressure and the control method thereof provided by the present invention have the following beneficial effects:

[0028] The smoke exhaust fan of the present invention has a balanced smoke exhaust pressure, in which an electromagnetic pump group is arranged, one or two gear pumps (or electromagnetic pumps) are adopted to provide the pressure of the smoke oil in the energy storage device, and a nitrogen-filled energy storage device is arranged. The high-pressure smoke oil is temporarily stored in the nitrogen-filled energy storage device before the smoke exhaust operation. During the smoke exhaust operation, the high-pressure smoke oil in the nitrogen-filled energy storage device will be sent to the heater for atomization to form a tall and large smoke column, and the smoke exhaust effect is better. After the smoke exhaust is completed, the electromagnetic valve control module controls the instantaneous smoke collection of the smoke column, and the smoke oil that has not been sprayed in the heater is refluxed into the oil barrel through the directional pressure through the reflux electromagnetic valve, so as to avoid residual smoke from being sprayed out after the heater is sprayed. The electromagnetic valve control module arranged has a simple and compact structure and does not require complex pipelines. Compared with the traditional prior art, the pipelines, chassis space structure and lines are simpler, and it is more convenient to assemble, repair or replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the structure of a smoke exhaust fan with balanced smoke spraying pressure in the present invention.

[0030] Figure 2 It is a structural schematic diagram of the solenoid valve control module in the present invention.

[0031] Figure 3 The figure is a connection diagram of a smoke exhaust fan with balanced smoke spray pressure in the present invention.

[0032] Figure 4-7 All of them are flow charts of a control method of the present invention.

[0033] Among them, 1. oil drum, 2. electromagnetic pump group, 3. electromagnetic valve control module, 4. heater, 5. energy storage device, 6. pressure sensor, 7. injection pressure solenoid valve, 8. smoke spray working solenoid valve, 9. pressure relief solenoid valve, 10. return solenoid valve, 11. solenoid valve body, 12. oil inlet pipe, 13. first oil outlet pipe, 14. return oil pipe, 15. first three-way device, 16. second oil outlet pipe, 17. second three-way device.

[0034] The first oil outlet pipe (13) and the second oil outlet pipe (16) are metal copper pipes, stainless steel pipes or high-pressure Teflon pipes connected to each other through ferrule joints, and the oil inlet pipe (12) and the oil return pipe (14) are silicone hoses or thermoplastic polyurethane (PU) pipes; the connection diagram is only for illustrating the working principle, and the length and diameter of the pipes shall be subject to the actual machine chassis structure. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "middle", "inside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The implementation modes of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation modes of the present invention are not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0037] See also Figure 1-7 A smoke machine with balanced smoke spraying pressure comprises: an oil barrel 1 for storing smoke oil required for atomization; an electromagnetic pump group 2, connected to the oil barrel 1 through an oil inlet pipe 12, to provide sufficient pressure for smoke spraying; an electromagnetic valve control module 3, connected to the electromagnetic pump group 2 through a first oil outlet pipe 13 and provided with a pressure sensor 6 at the connection, connected to the oil barrel 1 through an oil return pipe 14, to control the smoke spraying pressure of the smoke machine and the reflux of the smoke oil; a heater 4, used to convert the smoke oil into smoke; an accumulator, connected to the oil outlet pipe in the electromagnetic valve control module 3, to temporarily store the smoke oil with high pressure. The electromagnetic pump group 2 delivers the smoke oil into the accumulator or heater 4 through the oil inlet pipe 12. The accumulator can temporarily store the smoke oil delivered by the electromagnetic pump group 2 and maintain high pressure, so that the smoke oil delivered from the accumulator to the heater 4 maintains high pressure, and can be atomized together with the smoke oil delivered by the electromagnetic pump group 2 to the heater 4 to form a large and high smoke column, which has a better stage effect. The electromagnetic valve control module 3 can control the smoke spraying time, and can also control the smoke oil to flow back from the heater 4 to the oil barrel 1 for recycling, and can also control the smoke spraying pressure.

[0038] The solenoid valve control module 3 includes an injection solenoid valve 7, a working solenoid valve 8, a pressure relief solenoid valve 9, a reflux solenoid valve 10 and a solenoid valve housing 11. The solenoid valve housing 11 is respectively provided with an A port, a B port, a C port, a D port and an E port. The injection solenoid valve 7 is connected to the first oil outlet pipe 13 and the energy accumulator through the A port and the E port respectively. The B port is used to install the pressure sensor 6 and is connected to the heater 4. The working solenoid valve 8 is connected to the heater 4 through the C port. The pressure relief solenoid valve 9 is connected to the return oil pipe 14 through the D port. The reflux solenoid valve 10 is connected to the heater 4.

[0039] In one embodiment of the present invention, the energy storage device is a nitrogen-filled airbag energy storage device 5. The nitrogen-filled energy storage device 5 can prevent the energy storage device from being oxidized, and nitrogen as an inert gas can ensure the stability of the energy storage device and ensure the effective conversion and utilization of energy.

[0040] In one embodiment of the present invention, a first three-way device 15 is provided at the connection between the electromagnetic pump group 2 and the first oil outlet pipe 13 .

[0041] In one embodiment of the present invention, a second oil outlet pipe 16 is provided at the connection between the working solenoid valve 8 and the heater 4 . The working solenoid valve 8 delivers the smoke oil input from the electromagnetic pump group 2 into the heater 4 through the second oil outlet pipe 16 .

[0042] In one embodiment of the present invention, a second three-way device 17 is provided at the connection between the second oil outlet pipe 16 and the heater 4. The second three-way device 17 allows the heater 4 to return flow to the solenoid valve control module 3.

[0043] In one embodiment of the present invention, the electromagnetic pump group 2 is one or two electromagnetic pumps (or gear pumps). Two electromagnetic pumps or gear pumps have higher output flow and pressure, and the output smoke column has better effect.

[0044] In one embodiment of the present invention, the reflux solenoid valve 10 is connected to the oil barrel 1 through the oil return pipe 14. The reflux solenoid valve 10 controls the oil return pipe so that the residual oil in the heater 4 can be sent into the oil barrel 1.

[0045] In one embodiment of the present invention, the energy accumulator 5 and the pressure sensor 6 are directly connected internally, and according to the space requirements of the assembly structure, the assembly positions can be interchanged, that is, the B port of the solenoid valve control module can also be connected to the energy accumulator, and the E port can also be connected to the pressure sensor.

[0046] A control method, applicable to a smoke exhaust fan with balanced smoke spray pressure, comprising:

[0047] Step S1, turn on the power of the range hood, the heater enters the preheating state, open the pressure relief solenoid valve 9, at this time, other valves are closed, and the smoke oil stored in the energy storage device is returned to the oil barrel 1 through the D port and the return oil pipe 14; this step is used to detect whether there is oil in the oil barrel through the pressure change in step S2, and the failure of pressurization can be determined as insufficient oil or lack of oil in the oil barrel;

[0048] Step S2, after the pressure relief is completed, the pressure relief solenoid valve 9 is closed, and the pressure injection solenoid valve 7 and the electromagnetic pump group 2 are opened. At this time, the other valves are closed and the boost mode is entered. The electromagnetic pump group 2 injects the tobacco oil from the A port through the E port into the energy storage end of the E port of the electromagnetic valve control module and the pressure sensor end of the B port of the electromagnetic valve control module. When the pressure sensor 6 detects that the pressure reaches the preset pressure value, the pressure injection solenoid valve 7 and the electromagnetic pump group 2 are closed, and the boost is completed; if the boost fails, it can be determined that the oil in the oil barrel is insufficient or there is no oil detection; if the boost fails within the rated time, the system closes the pressure injection solenoid valve (7) and the electromagnetic pump group (2) to protect the electromagnetic pump well to prevent damage due to long-term no-load;

[0049] Step S3, when the heating is completed and the smoke spraying instruction is received, the smoke spraying working solenoid valve 8 is opened to enter the smoke spraying mode, and the high-pressure smoke oil in the energy storage device is released from the C port through the second oil outlet pipe 16 and the second three-way device into the heater for vaporization and smoke spraying. After the preset spraying time is reached, the working solenoid valve is closed and the smoke spraying ends; during this smoke spraying process, the pressure drops and the injection pressure solenoid valve 7 and the electromagnetic pump group 2 are automatically opened to ensure that the pressure of the energy storage device is constant; during the smoke spraying process, except for the smoke spraying working solenoid valve 8, the injection pressure solenoid valve 7 and the electromagnetic pump group 2, other valves are closed;

[0050] Step S4, after the smoke spraying is finished, the reflux solenoid valve 10 is opened. At this time, the smoke spraying solenoid valve 8 and the pressure relief solenoid valve 9 are both in the closed state. The smoke oil in the pipe of the heater 4 will flow from the C port to the D port due to the reverse pressure and flow back into the oil barrel 1, achieving the effect of stopping immediately after closing;

[0051] The pressure injection solenoid valve 7 and the solenoid pump group 2 are limited to maintaining a constant pressure after the pressure relief is completed each time the power is turned on. They will automatically open when the pressure decreases or is insufficient, and are not related to other states.

[0052] Note: The liquid oil flow diagrams in each step are only schematic diagrams, used to illustrate the direction of the fluid inlet and outlet in each state, and are not the actual structure inside the actual valve body.

[0053] In a smoke exhaust fan with balanced smoke spraying pressure of the present invention, an electromagnetic pump group 2 is provided, one or two gear pumps (or electromagnetic pumps) are used to provide pressure, and a nitrogen-filled accumulator 5 is provided. High-pressure smoke oil is temporarily stored in the nitrogen-filled accumulator 5 before smoke spraying. When smoke spraying is in operation, the high-pressure smoke oil in the nitrogen-filled accumulator 5 and the smoke oil delivered by the electromagnetic pump group 2 are sent together into the heater 4 to be atomized to form a tall and large smoke column, and the smoke spraying effect is better. After the smoke spraying is completed, the electromagnetic valve control module 3 controls the smoke spraying to stop immediately, and the unvaporized smoke oil in the heater 4 is refluxed into the oil barrel 1 by the reverse pressure through the reflux electromagnetic valve 10, so as to avoid residual smoke spraying after the heater 4 is sprayed. The electromagnetic valve control module 3 provided has a simple structure, and compared with the traditional prior art, the circuit is simpler and more convenient for maintenance or replacement.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A smoke exhaust fan with balanced smoke pressure, characterized in that: include: The oil barrel (1) is used to store the tobacco oil required for atomization; The electromagnetic pump group (2) is connected to the oil barrel (1) through an oil inlet pipe (12) to provide sufficient pressure for smoke spraying; The solenoid valve control module (3) is connected to the solenoid pump group (2) via a first oil outlet pipe (13), connected to a second tee (17) via a second oil outlet pipe (16), and connected to the oil barrel (1) via an oil return pipe (14), and the solenoid valve control module (3) is connected to an energy accumulator (5) and a pressure sensor (6); A heater (4) for converting the smoke oil into smoke; An energy storage device (5) is connected to the outlet (E) of the solenoid valve control module (3) and is used for temporarily storing high-pressure tobacco oil; A pressure sensor (6) is connected to the outlet (B) of the solenoid valve control module (3) and is directly connected to the inside of the solenoid valve control module (3) and the energy accumulator (5) to detect the internal pressure of the energy accumulator (5); The solenoid valve control module (3) comprises a pressure injection solenoid valve (7), a smoke spraying solenoid valve (8), a pressure relief solenoid valve (9), a reflux solenoid valve (10) and a solenoid valve body (11); the solenoid valve body (11) is respectively provided with an A port, a B port, a C port, a D port and an E port; the pressure injection solenoid valve (7) is respectively connected to a first oil outlet pipe (13), a pressure sensor (6) and an energy accumulator (5) via the A port, the B port and the E port; the B port is used to install the pressure sensor (6) and is connected to the energy accumulator (5) direct connection, the outlet of the smoke spraying solenoid valve (8) is connected to the external heater (4) through the internal connection C port, and the inlet is connected to the outlet of the injection solenoid valve (7) through the inside of the valve body (11); the pressure relief solenoid valve (9) is connected to the return oil pipe (14) through the D port, and the input is connected to the energy accumulator (5) through the inside of the valve body; the inlet of the return solenoid valve (10) is directly connected to the C port through the inside of the valve body (11), and the outlet is connected to the D port through the inside of the valve body (11).

2. A smoke exhaust hood with balanced smoke pressure according to claim 1, characterized in that: The energy storage device (5) is a nitrogen-filled energy storage device (5).

3. The smoke exhaust hood with balanced smoke spray pressure according to claim 1, characterized in that: A first tee (15) is provided at the connection between the electromagnetic pump group (2) and the first oil outlet pipe (13).

4. The smoke exhaust hood with balanced smoke spray pressure according to claim 1, characterized in that: A second oil outlet pipe (16) is provided at the connection between the outlet C of the solenoid valve control module (3) and the heater (4).

5. A smoke exhaust fan with balanced smoke spray pressure according to claim 4, characterized in that: A second tee (17) is provided at the connection between the second oil outlet pipe (16) and the heater (4).

6. According to the smoke exhaust fan with balanced smoke spraying pressure as claimed in claim 1, the electromagnetic pump group (2) is one or two electromagnetic pumps (or gear pumps).

7. The smoke exhaust hood with balanced smoke spray pressure according to claim 1, characterized in that: The outlet D of the return solenoid valve (10) is connected to the oil drum (1) via an oil return pipe (14).

8. According to the smoke exhaust hood with balanced smoke pressure as described in claim 1, the heater (4) can be a single oil inlet pipe heater. When a single oil inlet pipe heater is used, the second oil outlet pipe (16) and the second tee (17) can be cancelled, and the heater oil inlet pipe can be directly connected to port C.

9. According to the smoke exhaust fan with balanced smoke pressure as described in claim 1, the energy accumulator (5) and the pressure sensor (6) are directly connected internally, and the assembly positions can be interchanged according to the space requirements of the assembly structure, that is, the B port of the solenoid valve control module can also be connected to the energy accumulator, and the E port can also be connected to the pressure sensor.

10. A control method, applicable to a smoke exhaust fan with balanced smoke spray pressure as claimed in any one of claims 1 to 9, characterized in that: include: Step S1, connect the power supply of the range hood, the heater enters the preheating state, open the pressure relief solenoid valve (9), at this time, other valves are closed, and the smoke oil stored in the energy storage device is returned to the oil barrel (1) through the D port and the return oil pipe (14); this step is used to detect whether there is oil in the oil barrel through the pressure change in step S2, and the failure of pressurization can be judged as insufficient oil or lack of oil in the oil barrel; Step S2, after the pressure relief is completed, the pressure relief solenoid valve (9) is closed, and the pressure injection solenoid valve (7) and the electromagnetic pump group (2) are opened. At this time, the other valves are closed and the system enters the boosting mode. The electromagnetic pump group (2) injects the tobacco oil from the A port through the E port into the energy storage end of the E port of the electromagnetic valve control module and the pressure sensor end of the B port of the electromagnetic valve control module. When the pressure sensor (6) detects that the pressure reaches a preset pressure value, the pressure injection solenoid valve (7) and the electromagnetic pump group (2) are closed, and the boosting is completed. If the boosting fails, it can be determined that there is not enough oil in the oil barrel or there is no oil (no oil detection). If the boosting fails within the rated time, the system closes the pressure injection solenoid valve (7) and the electromagnetic pump group (2), which can well protect the electromagnetic pump to prevent damage due to long-term no-load. Step S3, when the heating is completed and the smoke spraying instruction is received, the smoke spraying working electromagnetic valve (8) is opened to enter the smoke spraying mode, and the high-pressure smoke oil in the energy storage device is released from the C port through the second oil outlet pipe (16) and the second three-way device into the heater for vaporization and smoke spraying. After the preset spraying time is reached, the working electromagnetic valve is closed and the smoke spraying ends; during this smoke spraying process, the pressure drops and the injection pressure electromagnetic valve (7) and the electromagnetic pump group (2) are automatically opened to ensure that the pressure of the energy storage device is constant; during the smoke spraying process, except for the smoke spraying working electromagnetic valve (8), the injection pressure electromagnetic valve (7) and the electromagnetic pump group (2), all other valves are closed; Step S4, after the smoke spraying is finished, the return solenoid valve (10) is opened, at which time the smoke spraying working solenoid valve (8) and the pressure relief solenoid valve (9) are both in the closed state, and the smoke oil in the heater (4) pipe will flow from the C port to the D port due to the reverse pressure and flow back into the oil barrel (1), achieving the effect of stopping immediately after closing; The pressure injection solenoid valve (7) and the solenoid pump group (2) are limited to maintaining a constant pressure after the pressure relief is completed each time the power is turned on, and automatically opening when the pressure decreases or is insufficient, and are not related to other states.

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