Airflow jet heat dissipation, dehumidification and dust removal system of power device

Abstract

The invention relates to an airflow jet heat dissipation, dehumidification and dust removal system of a power device, and belongs to the technical field of power supply and distribution. Comprising an electric power device and a protection box body of the electric power device, the electric power device is arranged in the protection box body, at least one airflow ejector is installed in the protection box body, an air outlet nozzle of a jet flow nozzle of the airflow ejector corresponds to the surface of the electric power device, and the jet flow nozzle is in a wedge shape. Jet air generated by the airflow ejector efficiently and uniformly performs heat dissipation, dehumidification and dust removal on the electric power device, so that the purposes of saving air consumption, reducing energy consumption, preventing electric leakage and short circuit of electric appliances, reducing power loss, prolonging the service life of the electric power device and improving the safety and operation stability of the electric power device are achieved.

Description

Technical Field

[0001] The invention relates to an airflow jetting heat dissipation, dehumidification and dust removal system for an electric device, belonging to the technical field of power supply and distribution. Background Art

[0002] While operating power equipment outdoors without an outer enclosure provides excellent heat dissipation, it presents safety challenges such as protection from rain and snow, birds and insects, electric shock, dust, and fire. To address this, power equipment operating outdoors, both domestically and internationally, generally employs a protective structure that incorporates an outer enclosure (including additional structures) with louvers on the vertical surfaces for ventilation and heat dissipation. However, installing an outer enclosure and installing louvers on the vertical surfaces, particularly in the upper middle portion, can lead to problems such as poor heat dissipation, condensation, dust accumulation, and electrical circuit breaker tripping.

[0003] The enclosures of electrical equipment used outdoors, such as box-type transformers, wind turbine nacelles, energy storage power supplies, inverters, ring main units, and junction boxes, must provide excellent protection against rain, snow, moisture, insects, dust, fire, noise, and heat dissipation. They must also meet different protection levels based on operating conditions, generally requiring IP23 or higher. For European-style transformers, the surface temperature must be below 95°C, and the surface temperature rise in indoor and outdoor comparison tests must not exceed 30K. However, our research with power departments and manufacturers revealed that existing box-type transformers without mechanical forced ventilation often experience a temperature rise exceeding 30K under rated load. Many products also suffer from side leaks, insect intrusion, and humidity exceeding 85% after shutdown. Especially during the hot summer months, overtemperature alarms and condensation often occur, leading to transformer tripping or burnout. These frequent incidents severely impact normal production and daily life.

[0004] In terms of heat dissipation, dehumidification and dust removal methods, the existing heat dissipation, dehumidification and dust removal methods for power devices with protective boxes are mainly the following:

[0005] ① Natural ventilation + filter. This method has poor heat dissipation and dehumidification effects, almost no anti-condensation ability, and dust easily accumulates on the surface of electrical appliances.

[0006] ② Mechanical ventilation + dehumidifier or desiccant + filter. This method has good heat dissipation and dehumidification effects, but it consumes a lot of energy, is noisy, and dust easily accumulates on the surface of the electrical appliances.

[0007] ③ Exhaust or blow or compressed air circulation, for example: China Patent Publication No. CN213636816U's "A Switch Cabinet" adopts a centralized exhaust method, and the heat dissipation effect is poor when there is no air inlet. China Patent Publication No. CN222338884U's "A Low-voltage Distribution Cabinet with Alternating Blowing" adopts a blower blowing + refrigerator method, which is a centralized blast cooling of the entire space in the box. This method is similar to flooding farmland, with large gas consumption, high energy consumption, and poor dust removal effect. China Patent Publication No. CN208113189U's "A Dehumidifying and Cooling Industrial Electrical Cabinet" adopts an electric baking wire + fan blowing method, which is a centralized blowing of the entire space in the box + electric baking wire to bake the moisture-absorbing sponge for dehumidification. This method is similar to flooding farmland, requiring a large gas flow, high energy consumption, and poor dust removal effect. China Patent Publication No. CN207542628U, "Outdoor Electrical Cabinet with Heat Dissipation and Dehumidification Functions", adopts a method of using a fan to blow air to the entire space inside the box. This method is similar to flooding farmland, requiring a large gas flow, high energy consumption, and poor dust removal effect. China Patent Publication No. CN104795967A, "Cooling and Dehumidification Device and Converter Using the Same", adopts a method of fan + evaporator + air duct. This method is similar to flooding farmland, requiring a large gas flow, high energy consumption, and poor dust removal effect. China Patent Publication No. CN221767422U, "A Circulating Heat Dissipation and Dehumidification Device for a Distribution Cabinet", adopts a method of suction pump + sieve plate + nozzle. The nozzle concentrates the air on the entire space inside the box. This method is similar to flooding farmland, requiring a large gas flow, high energy consumption, and poor dust removal effect.

[0008] Regarding the temperature rise and losses of power equipment, as operating temperatures rise, the insulation materials of power equipment such as transformers will rapidly age, reducing the transformer's service life. Especially when the temperature exceeds the allowable rated hotspot temperature, the transformer's lifespan decreases dramatically, at a rate of half for every 6°C increase in temperature (this is known as the internationally recognized "6-degree rule" for transformers). (For details, see the national standard GB / T15164-1994, "Guidelines for Loading Oil-Immersed Power Transformers.") Furthermore, for every 10°C increase in ambient temperature, the lifespan of key power electronic components decreases by 50%. Furthermore, the transformer's load losses increase with rising operating temperature. Under the same load conditions, for every 10°C increase in operating temperature, the load losses increase by approximately 3.93% (for copper windings) or 4.23% (for aluminum windings).

[0009] Through investigations and theoretical research at transformer substations, transformer production plants, and wind turbine nacelle manufacturers, we found that the root causes of problems such as excessive temperatures, poor dehumidification, and dust accumulation in non-mechanically ventilated power installations are:

[0010] (1) Poor heat discharge. In order to prevent rain, snow, and debris from entering the power box, the air inlet and outlet holes of existing outdoor power devices are all opened on the vertical panels or on the floor of the box. Through computer simulation and smoke tests, we found that: in the box with a closed power device on the top, a large amount of heat loss generated by the power device forms a heat vortex inside the box, and the heat flow is not discharged smoothly, and heat continues to accumulate, causing the temperature inside the box to rise. Even if there is an air outlet on the upper cover, a protective plate needs to be installed. The protective plate only serves to prevent rain and solar radiation, and cannot use external wind to enhance exhaust. For example: "A box transformer heat dissipation device" with the patent announcement number CN209993935U of the Chinese Academy of Sciences includes a box body, and a plurality of longitudinally distributed horizontal air inlet slots are opened on both sides of the box body; a metal mesh is provided in the air inlet slot, and a downward-slanting rain shield is provided on the upper end of the outer side of the air inlet slot; the left and right inner walls of the box body are removably provided with shielding covers, which cover the multiple air inlet slots on the same side; a plurality of air holes are provided on the surface of the shielding cover, and a cloth bag is provided inside the shielding cover, and an activated carbon block is provided in the cloth bag; the top surface of the box body is in an inverted V shape, and an insulation board is provided through a plurality of insulating columns; an air outlet is opened in the middle of the top surface of the box body, and an exhaust fan is provided in the air outlet; the inner top surface of the box body is provided with a plurality of heat dissipation fins evenly distributed around the air outlet; a horizontal shielding plate is also provided directly below the exhaust fan, and the shielding plate is fixedly connected to the lower ends of the multiple heat dissipation fins. Another example: China Science and Technology Patent Publication No. CN210926784U, "A New Type of Box Transformer Heat Dissipation Channel," includes a box transformer housing, a top pressure plate, an eaves plate, an exhaust duct, and a filter. The bottom of the box transformer housing is fixedly connected to the base, the eaves plate is fixedly connected to the bottom of the top pressure plate, and the top pressure plate is fixedly connected to side pressure plates at both ends. The left end of the box transformer housing is provided with a first cabinet, the end of the box transformer housing away from the first cabinet is connected to a third cabinet, and the middle of the box transformer housing is provided with a second cabinet. The rear end of the box transformer housing is provided with three heat dissipation vents. The box transformer housing is internally connected to a power distribution cabinet, the exhaust duct is fixedly connected to the top of the power distribution cabinet, the top of the duct cover is provided with an air outlet, and the ventilation grille is fixedly mounted on the outside of the box transformer housing. The above patents all have air inlets and outlets on the side. For example, in their article "Research on Optimization Methods for Wind Turbine Nacelle Cooling Structures," published in the May 2017 issue of the journal Renewable Energy, Ma Tieqiang, Sun Debin, and others from Shenyang University of Technology and its Wind Energy Technology Research Institute summarized four existing wind turbine nacelle air inlet and outlet locations: "downward-flow tail exhaust," "downward-flow side exhaust," "side-flow tail exhaust," and "side-flow side exhaust." All four configurations supply or exhaust air from the vertical sides of the nacelle. To prevent the ingress of rain, snow, and dust, no exhaust vents are located on the nacelle roof.

[0011] (2) The heat dissipation of traditional natural heat dissipation boxes mainly relies on the thermal buoyancy (thermal pressure) inside the box, and does not take advantage of the wind pressure suction effect of external natural wind.

[0012] (3) When there is wind and rain at a certain angle from above, a small amount of raindrops will enter the inner side of the box through the shutters opened on the upper part of the enclosure, threatening the safety of the electrical appliances.

[0013] (4) The conductive parts of the power equipment will form condensation due to temperature changes and humidity, and dust will accumulate on the surface of the conductive parts, causing leakage, short circuit and tripping.

[0014] (5) The traditional exhaust or compressed air circulation method is used to exhaust or blow air into the entire space inside the box. Since the air flow is far away from some electrical appliances and close to others, the air flow organization is unreasonable, resulting in large gas consumption, high energy consumption, and uneven heat dissipation, dehumidification, and dust removal effects on various electrical appliances. Summary of the Invention

[0015] The purpose of the present invention is to provide an airflow jet heat dissipation, dehumidification and dust removal system for electric devices, which has good heat dissipation, dehumidification and dust removal effects on various electric devices in the box, and has low gas consumption, low energy consumption and high protection level.

[0016] The present invention describes an airflow jet heat dissipation, dehumidification and dust removal system for an electric device, which includes an electric device and a protective box for the electric device. The electric device is placed in the protective box, and at least one airflow ejector is installed in the protective box. The air outlet of the jet nozzle of the airflow ejector corresponds to the surface of the electric device, and the jet nozzle is wedge-shaped.

[0017] The jet wind generated by the air jet ejector efficiently and evenly dissipates heat, dehumidifies and removes dust from the power device, thereby saving gas usage, reducing energy consumption, preventing electrical leakage and short circuit, reducing power loss, extending the life of the power device, and improving the safety and operational stability of the power device.

[0018] The action modes of the jet nozzle of the airflow ejector include: fixed, rotating, swinging, etc. The shapes of the air outlet nozzle include slit, duckbill, porous, annular, etc. Specifically, a high-speed jet fan and a wedge-shaped jet nozzle system are adopted (the existing high-speed jet fan does not have a wedge-shaped jet nozzle on the periphery). The existing general high-speed jet fan can generally only generate a wind speed of 10m / s to 40m / s. The wind speed ejected by the wedge-shaped nozzle will be increased to more than 50m / s, which has good heat dissipation, dehumidification and dust removal effects on various electrical devices in the box, and has low gas consumption, low energy consumption and high protection level.

[0019] Preferably, the air flow ejector includes a jet fan and a jet nozzle, the jet fan is located inside the jet nozzle, the jet nozzle is provided with an air inlet and an air outlet, the air outlet of the jet nozzle is within a distance range from the end center speed of the blown air flow to 0.5±0.05m / s, and the jet fan is connected to the power supply through a power supply line.

[0020] Preferably, the airflow ejector is fixed to the protective box or the outer shell of the electric device via a bracket.

[0021] Preferably, the air outlet nozzle of the jet nozzle corresponding to the surface of the electric device is obliquely facing, directly facing, or facing in the same direction as each surface or a certain surface of the electric device.

[0022] Preferably, the protective box body includes a bottom plate, a facade panel, and an upper panel. An air inlet is provided on the bottom plate of the protective box body or the lower part of the facade panel, and a protective net is provided on the air inlet. At least one air outlet is provided on the upper panel of the box body, and a rainproof exhaust device is provided on the air outlet.

[0023] The protective net can be a moisture-proof net curtain or a moisture-proof valve plate. The moisture-proof net curtain or moisture-proof valve plate can reduce the humidity of the gas entering the protective box and prevent the entry of small animals, dust, debris, etc.

[0024] The rainproof exhaust device can not only prevent the ingress of rainwater, but also discharge the hot, humid and dusty gases inside the protective box. It can basically eliminate the heat eddy current inside the protective box, obtain good airflow organization, and improve the efficiency of heat dissipation, dehumidification and dust removal.

[0025] Preferably, the rainproof exhaust device adopts an electric rainproof exhaust device or a hybrid rainproof exhaust device combining electric and natural power. The electric rainproof exhaust device or the hybrid rainproof exhaust device is connected to the power supply through a power connection line, and a rainproof exhaust controller is connected to the power connection line.

[0026] Preferably, a fire extinguisher for electrical fires is installed in the protection box, a solenoid valve is connected to the nozzle of the fire extinguisher, and a temperature controller or a smoke detector is connected to the power line of the solenoid valve.

[0027] When a fire occurs in the protective box, the solenoid valve will automatically open the fire extinguisher to put out the fire.

[0028] A sunlight reflecting layer is provided on the outer surfaces of the facade panels and the upper panel of the protection box body, which can reflect sunlight and reduce the temperature inside the protection box body.

[0029] Preferably, a photovoltaic panel is provided on the upper panel of the protective box. The power output by the photovoltaic panel passes through an automatic cycle timing switch or a temperature and humidity controller, and is directly or further connected to the electric rainproof exhaust device or the motor of a hybrid rainproof exhaust device through a solar controller and a battery. The power output by the photovoltaic panel is used as the power source for the jet fan.

[0030] Preferably, the rainproof exhaust device adopts a rainproof exhaust cap, and the motor of the rainproof exhaust device adopts a DC brushless motor. The rainproof exhaust cap includes a focusing protective cover, an exhaust cap photovoltaic panel, a DC brushless motor, an exhaust fan, a guide cover, and a wind blocker; the guide cover is used to guide the external wind to the air outlet at its lower part for discharge; the exhaust cap photovoltaic panel is used to generate electricity to drive the DC brushless motor to work, and the DC brushless motor is used to drive the exhaust fan to discharge the gas in the protective box; the wind blocker is used to block the oblique wind from entering the protective box.

[0031] Preferably, the power supply line is connected to a jet controller.

[0032] The jet controller can adopt an automatic cycle timing switch or a temperature and humidity controller to set the automatic cycle switching time of the power supply according to the needs of the jet time or automatically control the switching time of the power supply according to the temperature and humidity limit requirements in the protective box, thereby further reducing power consumption.

[0033] Compared with the existing technology, the beneficial effects of the airflow jet heat dissipation, dehumidification and dust removal system for an electric device of the present invention are as follows:

[0034] The present invention proposes an airflow jet heat dissipation, dehumidification and dust removal system for electric devices. By using a jet airflow to blow air efficiently and continuously or intermittently at a close distance on the surface of electric appliances, uniform heat dissipation, dehumidification and dust removal are simultaneously achieved, thereby saving gas usage, reducing energy consumption, preventing electrical leakage and short circuits, reducing power loss, extending the life of the electric device, and improving the safety and operational stability of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of an airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to the present invention;

[0036] Figure 2 This is a schematic structural diagram of an airflow ejector according to the present invention.

[0037] In the figure: 10. Protective box; 11. Bottom plate; 12. Vertical enclosure; 13. Upper panel; 14. Air inlet; 15. Protective net; 16. Support body; 17. Air outlet; 18. Photovoltaic panel; 20. Power device; 31. Power connection; 32. Solar controller; 33. Battery; 50. Rainproof exhaust cap; 51. Focusing protective cover; 52. Exhaust cap photovoltaic panel; 53. DC brushless motor; 54. Exhaust fan; 55. Air guide cover; 56. Wind resistance plate; 60. Jet controller; 61. Air outlet; 62. Power branch line; 63. Jet nozzle; 64. Jet fan; 65. Air inlet. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, this embodiment discloses an airflow jet heat dissipation, dehumidification and dust removal system for an electrical device, including a protective box body 10, a bottom plate 11 of the protective box body 10, a facade enclosure 12, an upper panel 13, a plurality of air inlet holes 14 opened on the bottom plate 11, a moisture-proof filter net (protective net 15), a support body 16 of the protective box body 10, an air outlet hole 17, a photovoltaic power generation panel 18 located on the upper panel 13 of the protective box body 10, and an electrical device 20 (electrical appliance) located in the protective box body. A solar controller 32 (MPPT), a battery 33, and a photovoltaic panel 18 are installed in the protective housing 10. The output of the solar controller 32 (MPPT) is connected to the power branch line 62 of the jet blower 64 in the jet nozzle 63 via an automatic cycle timer or a temperature and humidity controller. External air enters the jet nozzle 63 from the air inlet 65, and the jet blower 64 blows air, accelerating it in the jet nozzle 63 and spraying it from the air outlet 61 toward the power device. The automatic cycle timer or temperature and humidity controller sets the switching time or temperature and humidity threshold as needed. An electric rainproof exhaust cap 50 is installed on the air outlet 17. The electric rainproof exhaust cap 50 is composed of a focusing protective cover 51, an exhaust cap photovoltaic panel 52, a DC brushless motor 53, an exhaust fan 54, a deflector 55, and a wind blocker 56.

[0041] In the figure, the dotted line with an arrow represents the upward shear wind, the single-point dashed line with an arrow represents the external horizontal wind, and the solid line with an arrow represents the direction of airflow inside the protective box.

[0042] The system operates as follows: On the one hand, the electricity generated by the photovoltaic panel 18 is transmitted through the solar controller 32 (MPPT) and the battery 33, and then through the automatic cycle timer or temperature and humidity controller to drive the jet fan 64 to blow air. The air is accelerated in the jet nozzle 63, and the high-speed air is sprayed from the air outlet 61 toward the power device. The automatic cycle timer or temperature and humidity controller sets the switching time or temperature and humidity threshold as needed. On the other hand, when there is external wind, the external wind blows through the air guide hood 55 and sweeps the hot and humid air inside the rainproof exhaust cap 50 through the air outlet at its lower portion to be discharged. Alternatively, due to the temperature difference between the inside and outside of the protective box 10, the hot and humid air inside the protective box 10 is discharged through the rainproof exhaust cap 50. Alternatively, due to the electricity generated by the exhaust cap photovoltaic panel 52, the brushless DC motor 53 and the exhaust fan 54 are driven to discharge the hot and humid air inside the protective box 10. Alternatively, due to the combined effects of wind, temperature difference, and photovoltaic power, the rainproof exhaust cap 50 discharges the hot and humid air inside the protective box 10. The cold air enters the protective box 10 through the air inlet holes 14 and the moisture-proof filter screen on the bottom plate 11 and forms a good air flow organization. When there is an upward shear wind from the outside, the wind blocking plate 56 will block the shear wind from entering the protective box 10.

[0043] The rainproof exhaust cap 50 may also adopt a natural exhaust device or an enhanced exhaust device.

[0044] Figure 2 The air flow ejector has a power branch line 62 connected to the jet fan 64, and the external air enters the jet nozzle 63 from the air inlet 65. The jet fan 64 blows air and accelerates it in the jet nozzle 63. The high-speed wind is sprayed from the air outlet 61 toward the power device.

[0045] The use of a high-speed jet blower and wedge-shaped jet nozzles can generate wind speeds of 10 to 50 m / s, while consuming only about one-sixth the power of a traditional hair dryer. A battery 33 ensures normal operation of the system at night or in rainy weather. The deflector 55 and light-collecting shield 51 on the rainproof exhaust cap 50 prevent rainwater from entering the protective housing 10. The light-collecting shield 51 also focuses light and prevents debris or bird droppings from blocking the light and causing short circuits and burns in the photovoltaic panels 52.

[0046] The above is only a preferred specific implementation method of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solution and inventive concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. An airflow jet heat dissipation, dehumidification and dust removal system for an electric device, comprising an electric device (20) and a protective box (10) for the electric device (20), wherein the electric device (20) is placed in the protective box (10), and is characterized in that: At least one airflow ejector is installed in the protective box (10), and the air outlet (61) of the jet nozzle (63) of the airflow ejector corresponds to the surface of the power device (20), and the jet nozzle (63) is wedge-shaped.

2. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 1, characterized in that: The airflow ejector comprises a jet blower (64) and a jet nozzle (63). The jet blower (64) is located in the jet nozzle (63). The jet nozzle (63) is provided with an air inlet (65) and an air outlet (61). The air outlet (61) of the jet nozzle (63) is within a distance range from the terminal center of the blown airflow at a speed of 0.5±0.05 m / s. The jet blower (64) is connected to a power supply via a power supply line (31).

3. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 1, characterized in that: The airflow ejector is fixed on the protective box (10) or the outer shell of the electric device (20) via a bracket.

4. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 1, characterized in that: The air outlet nozzle (61) of the jet nozzle (63) corresponding to the surface of the electric device (20) is obliquely, directly or longitudinally facing each surface or a certain surface of the electric device (20).

5. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 1, characterized in that: The protective box body (10) comprises a bottom plate (11), a facade panel (12), and an upper panel (13). An air inlet (14) is provided on the bottom plate (11) of the protective box body (10) or at the lower part of the facade panel (12), and a protective net (15) is provided on the air inlet (14). At least one air outlet (17) is provided on the upper panel (13), and a rainproof exhaust device is provided on the air outlet (17).

6. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 5, characterized in that: The rainproof exhaust device adopts an electric rainproof exhaust device or a hybrid rainproof exhaust device combining electric and natural power. The electric rainproof exhaust device or the hybrid rainproof exhaust device is connected to the power supply through a power connection line, and the power connection line is connected to a rainproof exhaust controller.

7. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 5, characterized in that: The protection box (10) is equipped with a fire extinguisher for electrical fires. The nozzle of the fire extinguisher is connected to a solenoid valve. The power line of the solenoid valve is connected to a temperature controller or a smoke detector.

8. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 5, characterized in that: A photovoltaic power generation panel (18) is provided on the upper panel (13) of the protective box (10). The power output by the photovoltaic power generation panel (18) is connected to the motor of the electric rainproof exhaust device or the hybrid rainproof exhaust device directly or through a solar controller (32) and a battery (33) through an automatic cycle timer switch or a temperature and humidity controller. The power output by the photovoltaic power generation panel (18) is used as the power source of the jet fan (64).

9. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 5, characterized in that: The rainproof exhaust device adopts a rainproof exhaust cap (50), and the motor of the rainproof exhaust device adopts a DC brushless motor (53). The rainproof exhaust cap (50) comprises a focusing protective cover (51), an exhaust cap photovoltaic panel (52), a DC brushless motor (53), an exhaust fan (54), a guide cover (55), and a wind blocker (56); the guide cover (55) is used to guide external wind to the air outlet at its lower part for discharge; the exhaust cap photovoltaic panel (52) is used to generate electricity to drive the DC brushless motor (53) to work, and the DC brushless motor (53) is used to drive the exhaust fan (54) to discharge gas in the protective box (10); and the wind blocker (56) is used to prevent oblique wind from entering the protective box (10).

10. The airflow jet heat dissipation, dehumidification and dust removal system for an electric power device according to claim 2, characterized in that: The power supply line (31) is connected to a jet controller (60).

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