CN220471585U - Electromagnetic auxiliary heating steam generator based on air energy - Google Patents
Electromagnetic auxiliary heating steam generator based on air energy Download PDFInfo
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- CN220471585U CN220471585U CN202322148029.1U CN202322148029U CN220471585U CN 220471585 U CN220471585 U CN 220471585U CN 202322148029 U CN202322148029 U CN 202322148029U CN 220471585 U CN220471585 U CN 220471585U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 28
- 239000003507 refrigerant Substances 0.000 claims abstract description 63
- 239000002184 metal Substances 0.000 claims abstract description 40
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 24
- 229910052731 fluorine Inorganic materials 0.000 claims description 24
- 239000011737 fluorine Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 108091006146 Channels Proteins 0.000 description 41
- 239000007789 gas Substances 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 102000010637 Aquaporins Human genes 0.000 description 2
- 108010063290 Aquaporins Proteins 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
The utility model discloses an electromagnetic auxiliary heating steam generator based on air energy, and belongs to the field of steam generator production. The electromagnetic auxiliary heating unit comprises more than one electromagnetic auxiliary heater, each electromagnetic auxiliary heater comprises a metal barrel, an insulating heat-insulating layer is wrapped on the outer wall of each metal barrel, an electromagnetic coil is wound on the outer side of each insulating heat-insulating layer, a plurality of shielding magnetic strips are arranged on the outer circumference of each electromagnetic coil at intervals, a steam collecting drum is arranged at the upper end of each metal barrel, a steam outlet pipe is arranged on each steam collecting drum, and a steam exhaust cover corresponding to each steam collecting drum is arranged in each metal barrel. The utility model reduces the consumption of electric energy by absorbing heat in the air to assist in heating the refrigerant, directly generates steam through heat exchange between the refrigerant and water, and finally utilizes electromagnetic heating to further heat the steam, thereby realizing continuous and stable supply of the steam.
Description
Technical Field
The utility model belongs to the field of steam generator production, and particularly relates to an electromagnetic auxiliary heating steam generator based on air energy.
Background
The existing steam generator mainly comprises a fuel gas steam generator, an electric steam generator, an electromagnetic steam generator and the like according to different energy types, wherein the electromagnetic steam generator and the electric steam generator are driven by electric energy, the power consumption is high, the use cost is high, and how to save energy and reduce the use cost is the main research and development direction of the steam generator.
If the patent with the authority bulletin number of CN214841772U discloses a heat pump heat supply host with electromagnetic auxiliary heating, the heat pump heat supply host utilizes electromagnetic heating refrigerant to raise the air outlet temperature of the refrigerant, and the heat pump heat supply host can heat a heat exchanger and can raise the return air temperature of the refrigerant entering an evaporator, so that the defrosting effect is achieved, the defrosting of the evaporator can be realized without influencing the water outlet temperature under the extreme environment, and the heat pump system can be used under the extreme environment which is more severe. However, this heat pump system also has the following drawbacks: 1. the electromagnetic heating refrigerant is utilized, so that the water supply temperature cannot be directly increased, and the aim of saving energy cannot be fulfilled; 2. the heat pump system can only provide hot water, cannot rapidly provide high-temperature steam, and ensures continuous supply of high-temperature steam at about 180 ℃.
Disclosure of Invention
The utility model aims to solve the technical problems that: the utility model provides a overcome the not enough of prior art, provides an electromagnetism based on air can assists hot steam generator, and it is through the heat in the absorption air comes auxiliary heating refrigerant to reduce the electric energy consumption, rethread refrigerant and water heat transfer directly generate steam, finally utilize electromagnetic heating to further heat up steam, thereby produce high temperature steam, realized that steam is constantly steadily supplied, and compare in current electric steam generator or electromagnetic steam generator, the intensification is fast, greatly reduced use cost.
The electromagnetic auxiliary heat steam generator based on air energy comprises an air source heat pump unit, a steam outlet of the air source heat pump unit is connected with a steam inlet pipe of the electromagnetic auxiliary heat unit through a pipeline, the electromagnetic auxiliary heat unit comprises more than one electromagnetic auxiliary heat device, each electromagnetic auxiliary heat device comprises a metal barrel body, an insulating heat-insulating layer is wrapped on the outer wall of the metal barrel body, an electromagnetic coil is wound on the outer side of the insulating heat-insulating layer, a plurality of shielding magnetic strips are arranged on the outer circumference of the electromagnetic coil at intervals, the steam inlet pipe is communicated with the lower end of the metal barrel body, a steam collecting drum is arranged at the upper end of the metal barrel body, a steam outlet pipe is arranged on the steam collecting drum, a steam exhaust cover corresponding to the steam collecting drum is arranged inside the metal barrel body, and a plurality of steam outlet holes are formed in the steam exhaust cover.
Preferably, the steam collecting drum is of an upward convex spherical crown structure, and the steam exhaust cover is of a downward concave spherical crown structure.
Preferably, the metal barrel body is communicated with a liquid level device, and a flow control valve is arranged on the steam inlet pipe.
Preferably, each steam outlet pipe is provided with a pressure gauge for detecting the internal pressure of the metal barrel body and a pressure relief valve for relieving the pressure in the metal barrel body.
Preferably, the air source heat pump unit comprises a plate heat exchanger I, a high-temperature refrigerant circulation channel and a low-temperature refrigerant circulation channel are arranged in the plate heat exchanger I, the low-temperature refrigerant circulation channel is connected with the steam generation unit, a first fluorine path inlet of the high-temperature refrigerant circulation channel is communicated with an outlet of the first compressor, a first fluorine path outlet of the high-temperature refrigerant circulation channel is connected with an inlet of the fin evaporator through a first throttle valve, an outlet of the fin evaporator is connected with the first separator, and the first separator is connected with an inlet of the first compressor.
Preferably, the steam generating unit comprises a plate heat exchanger II, a refrigerant circulation channel III and a waterway circulation channel are arranged in the plate heat exchanger II, a third fluorine path inlet of the refrigerant circulation channel III is connected with an outlet of the second compressor, a third fluorine path outlet of the refrigerant circulation channel III is communicated with a second fluorine path inlet of the low-temperature refrigerant circulation channel through a second throttle valve, a second fluorine path outlet of the low-temperature refrigerant circulation channel is connected with an inlet of the second separator, and an outlet of the second separator is connected with an inlet of the second compressor.
Preferably, the electromagnetic auxiliary heat engine unit further comprises a frame, the electromagnetic auxiliary heat engine unit is arranged on one side of the frame, and the air source heat pump unit is arranged on the other side of the frame.
Compared with the prior art, the utility model has the beneficial effects that:
1. the electromagnetic auxiliary heating unit is matched with the air source heat pump unit capable of generating steam, the electromagnetic auxiliary heating unit is used for further heating the steam generated by the air source heat pump unit, and the continuous and stable supply of high-temperature steam can be realized by using a small amount of electric energy, so that the energy consumption is greatly saved, and the use cost is reduced;
2. the air source heat pump unit fully absorbs heat in the air to assist in heating the refrigerant, so that energy consumption of the first compressor is reduced, the steam generating unit absorbs heat of the refrigerant in the first compressor, energy consumption of the second compressor is reduced, the refrigerant after heat exchange enters the refrigerant circulation channel III and fully exchanges heat with the waterway circulation channel, water in the waterway circulation channel is quickly heated and vaporized to form steam, the whole process is short in time consumption and quick in temperature rise, and the purposes of saving time and electricity are achieved.
Drawings
FIG. 1 is a schematic diagram of the front structure of the present utility model;
FIG. 2 is a left side schematic view of the present utility model;
FIG. 3 is a right side schematic view of the present utility model;
FIG. 4 is a schematic view of the external structure of the electromagnetic auxiliary heater;
FIG. 5 is a schematic view of the internal structure of the electromagnetic auxiliary heater;
fig. 6 is a schematic diagram of the present utility model.
In the figure, 1, a rack; 2. an electromagnetic auxiliary heating unit; 201. a steam outlet pipe; 202. a steam collecting drum; 203. an electromagnetic coil; 204. shielding the magnetic stripe; 205. a liquid level device; 206. a steam inlet pipe; 207. a blow-down pipe; 208. a fixed base; 209. a pressure gauge; 210. a pressure release valve; 211. an insulating layer; 212. a metal tub; 213. a steam exhaust hood; 214. a steam outlet hole; 215. an electromagnetic valve; 216. a second temperature display; 3. a fin evaporator; 4. a first throttle valve; 5. a first compressor; 6. a second compressor; 7. a plate heat exchanger I; 701. a first fluorine path inlet; 702. a second fluorine path inlet; 703. a second fluorine path outlet; 704. a first fluorine path outlet; 8. a plate heat exchanger II; 801. a third fluorine path inlet; 802. a steam outlet; 803. a cold water inlet; 804. a third fluorine path outlet; 9. a first separator; 10. a second separator; 11. a flow control valve; 12. a total regulating valve; 13. a first temperature display; 14. and a second throttle valve.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
the directional terminology referred to in the paragraphs directed to the detailed description is merely for convenience of those skilled in the art in understanding the teachings presented herein in terms of the visual orientation illustrated in the drawings. Unless specifically defined and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly so that one of ordinary skill in the art would understand the meaning of the terms in this disclosure as the case may be.
As shown in fig. 1, 3 and 6, the electromagnetic auxiliary heat steam generator based on air energy comprises a rack 1, wherein an electromagnetic auxiliary heat engine unit is arranged on one side of the rack 1, and an air source heat pump unit 2 is arranged on the other side of the rack 1; the air source heat pump unit 2 comprises a plate heat exchanger I7, the plate heat exchanger I7 is preferably a brazing plate heat exchanger, a high-temperature refrigerant circulation channel and a low-temperature refrigerant circulation channel are arranged in the plate heat exchanger I7, the high-temperature refrigerant circulation channel and the low-temperature refrigerant circulation channel can exchange heat in the plate heat exchanger I7 sufficiently and rapidly, the low-temperature refrigerant circulation channel is connected with the steam generation unit, a first fluorine path inlet 701 of the high-temperature refrigerant circulation channel is communicated with an outlet of the first compressor 5, a first fluorine path outlet 704 of the high-temperature refrigerant circulation channel is connected with an inlet of the fin evaporator 3 through the first throttle valve 4, an outlet of the fin evaporator 3 is connected with the first separator 9, and the first separator 9 is connected with an inlet of the first compressor 5.
The steam generating unit comprises a plate heat exchanger II 8, the plate heat exchanger II 8 is preferably a brazing plate heat exchanger, a refrigerant circulation channel III and a waterway circulation channel are arranged in the plate heat exchanger II 8, a third fluorine channel inlet 801 of the refrigerant circulation channel III is connected with an outlet of the second compressor 6, a third fluorine channel outlet 804 of the refrigerant circulation channel III is communicated with a second fluorine channel inlet 702 of a low-temperature refrigerant circulation channel in the plate heat exchanger I7 through a second throttle valve 14, a second fluorine channel outlet 703 of the low-temperature refrigerant circulation channel is connected with an inlet of the second separator 10, and an outlet of the second separator 10 is connected with an inlet of the second compressor 6; the cold water inlet 803 of the waterway circulation channel is communicated with a water supply pipeline through a pump, and the steam outlet 802 of the waterway circulation channel is connected with the electromagnetic auxiliary heating unit through the main regulating valve 12.
As shown in fig. 3, the steam outlet 802 of the air source heat pump unit 2 is connected with the steam inlet pipe 206 of the electromagnetic auxiliary heat unit through a pipeline, the steam inlet pipe 206 is provided with a flow control valve 11, and the electromagnetic auxiliary heat unit comprises a plurality of electromagnetic auxiliary heat devices connected in parallel. As shown in fig. 4 and 5, each electromagnetic auxiliary heater comprises a metal barrel 212, a fixing base 208 is fixed at the bottom of the metal barrel 212, the metal barrel 212 is fixedly connected with a rack 1 through the fixing base 208, an insulating heat-insulating layer 211 is wrapped on the outer wall of the metal barrel 212, an electromagnetic coil 203 is wound on the outer side of the insulating heat-insulating layer 211, two ends of the electromagnetic coil 203 are connected with a variable-frequency heating controller, the heating temperature of the electromagnetic coil 203 is controlled through the variable-frequency heating controller, a plurality of shielding magnetic strips 204 are arranged at intervals on the outer circumference of the electromagnetic coil 203, the shielding magnetic strips 204 can shield the external magnetic field of the electromagnetic coil 203, magnetic force lines are prevented from leaking outwards, the heat energy conversion efficiency of the electromagnetic coil 203 is improved, and meanwhile, the magnetic field generated by the electromagnetic coil 203 is prevented from heating external metal materials, so that the electromagnetic auxiliary heater is safer and more reliable.
The steam inlet pipe 206 is communicated with the lower end of the metal barrel 212, a drain pipe 207 is arranged at the bottom of the metal barrel 212, the drain pipe 207 is used for cleaning impurities and condensed water of the metal barrel 212, the upper end of the metal barrel 212 is provided with a steam collecting drum 202, the steam collecting drum 202 is of an upward-protruding spherical crown structure, the steam collecting drum 202 is provided with a steam outlet pipe 201, and the steam collecting drum 202 is used for collecting steam and discharging the steam; the metal barrel 212 is internally provided with a steam exhaust cover 213 corresponding to the steam collecting drum 202, the steam exhaust cover 213 is of a spherical crown structure which is sunken downwards, a plurality of steam outlet holes 214 are formed in the steam exhaust cover 213, steam can be filtered by the steam exhaust cover 213, the steam heating time is increased, more time is reserved in the metal barrel 212 for heating when the steam impinges on the steam exhaust cover 213, meanwhile, if water drops are formed on the steam exhaust cover 213, the water drops can also drop into the metal barrel 212 for reheating and vaporization, a liquid level device 205 for observing conditions in the barrel is communicated with the metal barrel 212, after being heated by an electromagnetic auxiliary heat engine group, the steam can be maintained at about 180 ℃, finally the steam is discharged through a steam outlet pipe 201 and summarized through a total steam supply pipe, a second temperature display 216 and an electromagnetic valve 215 are arranged on the total steam supply pipe, and the second temperature display 216 is used for adjusting the steam supply, and the second temperature display 216 displays the steam temperature in real time.
Each steam outlet pipe 201 of the electromagnetic auxiliary heating unit is provided with a pressure gauge 209 for detecting the internal pressure of the metal barrel 212 and a pressure relief valve 210 for relieving the pressure in the metal barrel 212, and when the end pressure of the steam supply equipment reaches a set value, the pressure of the metal barrel 212 can be relieved through the pressure relief valve 210.
When the utility model is used, the first compressor 5 and the second compressor 6 are started, meanwhile, water is supplied to the waterway circulation channel of the plate heat exchanger II 8 through the pump, and cold water enters the waterway circulation channel through the cold water inlet 803. Meanwhile, the first compressor 5 is driven to operate by electric energy, the first compressor 5 is filled with refrigerant as refrigerant, the first compressor 5 compresses the refrigerant into high-temperature high-pressure gas, the refrigerant enters a high-temperature refrigerant circulation channel in the first plate heat exchanger 7 and exchanges heat with a low-temperature refrigerant circulation channel, the high-temperature high-pressure refrigerant becomes low-temperature high-pressure gas after heat exchange, the low-temperature low-pressure liquid refrigerant is throttled and cooled by the first throttle valve 4 to become low-temperature low-pressure liquid refrigerant, the liquid refrigerant enters the fin evaporator 3, heat in the air is absorbed by a fan for heat absorption and cold discharge, the heat in the air is absorbed for temperature rise to form phase change, the warmed refrigerant is converted into gas, the gas-liquid separation is carried out by the first separator 9 and the refrigerant returns to the first compressor 5 again, and the internal circulation is repeated. The heat in the air is continuously absorbed in the internal circulation process, so that the electric energy consumption of the first compressor 5 is reduced, and the energy-saving effect is achieved.
In the steam generating unit, the refrigerant in the low-temperature refrigerant circulating channel of the first plate heat exchanger 7 absorbs heat of the high-temperature refrigerant circulating channel and becomes gas state, the gas-liquid separation is carried out by the second separator 10, then the gas-liquid separation enters the second compressor 6, the second compressor 6 is driven by electric energy, the refrigerant is compressed into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the third refrigerant circulating channel, heat exchange is carried out fully on the second plate heat exchanger 8 and the waterway circulating channel, water in the waterway circulating channel is quickly heated and vaporized, the refrigerant becomes a secondary high-temperature high-pressure gas state after heat exchange, the temperature is reduced by the second throttle valve 14, the liquid form converted into the low-temperature low-pressure liquid form is returned to the first plate heat exchanger 7 to exchange heat with the high-temperature refrigerant circulating channel, the circulating operation is carried out in this way, the steam temperature is displayed by the first temperature display 13, when the steam temperature reaches about 120 ℃, the total regulating valve 12 is regulated, the steam is discharged through the steam outlet 802 and enters the steam inlet pipes 206 of the electromagnetic auxiliary heaters in the electromagnetic heat engine group 2, and the steam inlet quantity is controlled by the flow control valve 11.
Steam enters the metal barrel 212 through the steam inlet pipe 206, the pressure gauge 209 reacts to the pressure in the barrel in real time, the variable-frequency heating controller is started, the electromagnetic coil 203 is automatically controlled to be electrified or powered off through the electric contact pressure gauge, and when the pressure in the metal barrel 212 does not reach a preset value, the electromagnetic coil 203 is automatically electrified to heat the steam, so that the pressure in the barrel rises; when the pressure in the metal barrel 212 reaches the standard, the electromagnetic coil 903 is automatically powered off. After being electrified, the electromagnetic coil 203 forms a magnetic field, a heat source is generated in the metal barrel 212 through the magnetic field, the heat source can reach 300 ℃, the temperature is controlled through the variable-frequency heating controller in operation, so that the generated steam is maintained at about 180 ℃, and the steam is discharged through the steam outlet pipe 201 to continuously and stably supply steam for steam supply equipment.
Finally, although the description has been described in terms of embodiments, not every embodiment is intended to include only a single embodiment, and such description is for clarity only, as one skilled in the art will recognize that the embodiments of the disclosure may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The utility model provides an electromagnetism assists hot steam generator based on air can, includes air source heat pump set (2), its characterized in that: the steam outlet (802) of the air source heat pump unit (2) is connected with the steam inlet pipe (206) of the electromagnetic auxiliary heat pump unit through a pipeline, the electromagnetic auxiliary heat pump unit comprises more than one electromagnetic auxiliary heat device, each electromagnetic auxiliary heat device comprises a metal barrel body (212), an insulating heat preservation layer (211) is wrapped on the outer wall of the metal barrel body (212), an electromagnetic coil (203) is wound on the outer side of the insulating heat preservation layer (211), a plurality of shielding magnetic strips (204) are arranged at intervals on the outer circumference of the electromagnetic coil (203), the steam inlet pipe (206) is communicated with the lower end of the metal barrel body (212), a steam collecting drum (202) is arranged at the upper end of the metal barrel body (212), a steam outlet pipe (201) is arranged on the steam collecting drum (202), a steam exhaust cover (213) corresponding to the steam collecting drum (202) is arranged inside the metal barrel body, and a plurality of steam outlet holes (214) are formed in the steam exhaust cover.
2. The electromagnetic auxiliary heat steam generator based on air energy of claim 1, wherein: the steam collecting drum (202) is of an upward convex spherical crown structure, and the steam exhaust cover (213) is of a downward concave spherical crown structure.
3. The electromagnetic auxiliary heat steam generator based on air energy of claim 2, wherein: the metal barrel body (212) is communicated with a liquid level device (205), and a flow control valve (11) is arranged on the steam inlet pipe (206).
4. The electromagnetic auxiliary heat steam generator based on air energy of claim 1, wherein: each steam outlet pipe (201) is provided with a pressure gauge (209) for detecting the internal pressure of the metal barrel body (212) and a pressure relief valve (210) for relieving the pressure inside the metal barrel body (212).
5. The electromagnetic auxiliary heat steam generator based on air energy according to any one of claims 1 to 4, wherein: the air source heat pump unit (2) comprises a plate heat exchanger I (7), a high-temperature refrigerant circulation channel and a low-temperature refrigerant circulation channel are arranged in the plate heat exchanger I (7), the low-temperature refrigerant circulation channel is connected with the steam generation unit, a first fluorine path inlet (701) of the high-temperature refrigerant circulation channel is communicated with an outlet of the first compressor (5), a first fluorine path outlet (704) of the high-temperature refrigerant circulation channel is connected with an inlet of the fin evaporator (3) through a first throttle valve (4), an outlet of the fin evaporator (3) is connected with the first separator (9), and the first separator (9) is connected with an inlet of the first compressor (5).
6. The electromagnetic auxiliary heat steam generator based on air energy of claim 5, wherein: the steam generating unit comprises a plate heat exchanger II (8), a refrigerant circulation channel III and a waterway circulation channel are arranged in the plate heat exchanger II (8), a third fluorine channel inlet (801) of the refrigerant circulation channel III is connected with an outlet of the second compressor (6), a third fluorine channel outlet (804) of the refrigerant circulation channel III is communicated with a second fluorine channel inlet (702) of the low-temperature refrigerant circulation channel through a second throttle valve (14), a second fluorine channel outlet (703) of the low-temperature refrigerant circulation channel is connected with an inlet of the second separator (10), and an outlet of the second separator (10) is connected with an inlet of the second compressor (6).
7. The electromagnetic auxiliary heat steam generator based on air energy of claim 6, wherein: the electromagnetic auxiliary heating unit is arranged on one side of the frame (1), and the air source heat pump unit (2) is arranged on the other side of the frame (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322148029.1U CN220471585U (en) | 2023-08-10 | 2023-08-10 | Electromagnetic auxiliary heating steam generator based on air energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322148029.1U CN220471585U (en) | 2023-08-10 | 2023-08-10 | Electromagnetic auxiliary heating steam generator based on air energy |
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| Publication Number | Publication Date |
|---|---|
| CN220471585U true CN220471585U (en) | 2024-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322148029.1U Active CN220471585U (en) | 2023-08-10 | 2023-08-10 | Electromagnetic auxiliary heating steam generator based on air energy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220471585U (en) |
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2023
- 2023-08-10 CN CN202322148029.1U patent/CN220471585U/en active Active
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