Gas-fired boiler with protection function

Abstract

The utility model relates to a gas-fired boiler, in particular to a gas-fired boiler with a protection function. Comprising a shell, a gas inlet pipe, an electric control valve, a protection shell, heat preservation cotton, an inner container shell, a combustor, a combustion chamber, a first return stroke smoke pipe, a second return stroke smoke pipe and a supporting frame, the heat preservation cotton is arranged on the inner side of the protection shell, the inner container shell is arranged on the inner side of the heat preservation cotton, the combustor is arranged in the middle of the inner bottom end of the inner container shell, and the gas inlet pipe is arranged on the lower side of the right end of the protection shell; supporting frames are symmetrically arranged at the upper end and the lower end of the combustion chamber, a plurality of first return smoke pipes are arranged on the left side of the top end of each supporting frame, a plurality of second return smoke pipes are arranged on the right side of the top end of each supporting frame, and a shell is connected to the front end of the protective shell. The water inlet pipe is coiled at the front end of the protective shell in the Z shape, when water flows through the water inlet pipe, the temperature of the front end of the protective shell can be reduced, and people are prevented from being scalded.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas boiler, especially a gas boiler with protection function. BACKGROUND

[0002] A boiler is a heat energy conversion device used for heating water or generating steam. It produces high temperature by burning fuel (such as coal, natural gas, fuel oil, etc.) or other heat sources (such as electricity), and then transfers the heat to water or working medium, causing it to heat, boil and eventually convert into steam or hot water.

[0003] Currently, some gas boilers are installed outdoors according to demand. During long-term use, the boiler body is easily aged and damaged due to long-term exposure to external environment, wind and sun exposure, etc. In addition, the surface and surrounding temperature of the boiler is high during combustion, posing a risk of scalding. SUMMARY

[0004] In order to overcome the shortcomings that the boiler body is exposed to the external environment and easily aged and damaged, and the high temperature of the boiler body surface and surrounding easily causes personnel scalding, the purpose of the utility model is to provide a gas boiler with protection function.

[0005] The technical scheme of the utility model is: a gas boiler with protection function, comprising an outer shell, a water inlet pipe, a gas inlet pipe, a water outlet pipe, a water pump, a T-shaped pipe, an electric control valve, a protective shell, thermal insulation cotton, an inner shell, a burner, a combustion chamber, first return flue pipes, second return flue pipes and a support frame, the inner side of the protective shell is provided with thermal insulation cotton, the inner side of the thermal insulation cotton is provided with the inner shell, the inner bottom end of the inner shell is provided with the burner, the lower side of the right end of the protective shell is provided with the gas inlet pipe, the left end of the gas inlet pipe penetrates the protective shell, the thermal insulation cotton and the inner shell in sequence and is connected with the burner, the top end of the burner is provided with the combustion chamber, the support frames are symmetrically arranged at the upper and lower ends of the combustion chamber, a plurality of first return flue pipes are arranged at the left top end of the support frame, a plurality of second return flue pipes are arranged at the right top end of the support frame, the front end of the protective shell is connected with the outer shell, the front end of the protective shell is provided with the water inlet pipe, the water inlet pipe is connected with the water pump at the water inlet of the lower part of the water inlet pipe, the water inlet of the water pump penetrates the right end of the outer shell, the top end of the water inlet pipe is connected with the T-shaped pipe, the rear end of the T-shaped pipe penetrates the protective shell, the thermal insulation cotton and the inner shell from front to back in sequence, the lower part of the rear end of the protective shell is provided with the water outlet pipe, the water outlet pipe is provided with a control switch, and the front end of the water outlet pipe penetrates the protective shell, the thermal insulation cotton and the inner shell from back to front in sequence.

[0006] Optionally, it further comprises a winding belt, a servo motor and a telescopic sleeve, the inner bottom end of the inner shell is provided with the telescopic sleeve, the right end of the upper end support frame of the combustion chamber is provided with the servo motor, the output shaft of the servo motor is provided with the winding belt, and the bottom end of the winding belt is connected with the innermost sleeve of the telescopic sleeve.

[0007] Optionally, the telescopic sleeve has three sleeves in total, and two adjacent sleeves are connected together through sliding.

[0008] Optionally, the water outlet pipe is a U-shaped pipe, a lower water outlet of the water outlet pipe is communicated with the inner container shell, and an upper water outlet of the water outlet pipe is communicated with the outermost sleeve of the telescopic sleeve.

[0009] Optionally, the two support frames are internally provided with cavities, the cavity in the upper support frame of the combustion chamber is communicated with the upper ends of all the first return flue pipes and the top end of the combustion chamber, and the cavity in the lower support frame of the combustion chamber is communicated with the lower ends of all the first return flue pipes and the second return flue pipes.

[0010] Optionally, the filter box is further arranged, the top end of the protective shell is provided with the filter box, the bottom end of the filter box is in contact with the top end of the outer shell, and the top ends of all the second return flue pipes sequentially penetrate the inner container shell, the heat insulation cotton and the protective shell from bottom to top and are communicated with the air inlet of the filter box.

[0011] Optionally, the water inlet pipe is in a Z-shaped shape and is coiled at the front end of the protective shell.

[0012] Optionally, the turnover door and the magnet piece are further arranged, the left end of the outer shell is hingedly connected with the turnover door, the turnover door is provided with a ferrous protrusion, the left end of the inner container shell is provided with the magnet piece, and the ferrous protrusion and the magnet piece can be magnetically attracted together.

[0013] Optionally, the operation panel is further arranged, the front end of the outer shell is provided with the operation panel, and the burner, the water pump and the servo motor are electrically connected with the operation panel.

[0014] Optionally, the fire nozzle, the fire pipe and the temperature sensor are further arranged, the top end of the T-shaped pipe is connected with the electric control valve, the top end of the electric control valve is connected with the fire pipe, the top end of the fire pipe is connected with the fire nozzle, and the bottom end of the filter box is provided with the temperature sensor, and the temperature sensor penetrates the top end of the outer shell and is located in the inner portion of the outer shell.

[0015] The utility model discloses the beneficial effect is: 1, the water inlet pipe is coiled in the Z-shaped shape at the front end of the protective shell, when the water flow is through in the water inlet pipe, can reduce the temperature of the front end of the protective shell, prevents people from being scalded when contacting the protective shell.

[0016] 2, the heat insulation cotton arranged in the protective shell can not only effectively reduce the heat loss of the inner container shell, but also separate the inner container shell from the protective shell, prevent the heat of the inner container shell from directly conducting to the protective shell, thereby avoiding the temperature of the protective shell from increasing too fast.

[0017] 3, the design of the first return flue pipe and the second return flue pipe makes the waste gas after combustion pass through the inner container shell for multiple times before being discharged, and the heat in the waste gas can heat the water, which fully recovers the heat in the waste gas and improves the thermal efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0020] Figure 3 This is a three-dimensional structural diagram of the water inlet pipe and filter box of this utility model.

[0021] Figure 4 This is a cross-sectional view of some components of this utility model.

[0022] Figure 5 This is a three-dimensional structural diagram of the telescopic sleeve and combustion chamber components of this utility model.

[0023] The markings in the attached diagram are as follows: 1: Outer shell, 2: Control panel, 3: Water inlet pipe, 4: Air inlet pipe, 5: Filter box, 6: Fire sprinkler head, 7: Fire pipe, 9: Water outlet pipe, 10: Flip door, 1001: Magnetic sheet, 11: Water pump, 13: T-tube, 14: Electrically controlled valve, 15: Temperature sensor, 16: Protective shell, 17: Insulation cotton, 18: Inner shell, 19: Belt, 20: Servo motor, 21: Telescopic sleeve, 22: Burner, 23: Combustion chamber, 24: First pass flue pipe, 25: Second pass flue pipe, 26: Support frame. Detailed Implementation

[0024] The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0025] A gas-fired boiler with protective functions, such as Figures 1-5As shown, including the shell 1, operation panel 2, water inlet pipe 3, air inlet pipe 4, water outlet pipe 9, water pump 11, T pipe 13, electric control valve 14, protective shell 16, heat preservation cotton 17, inner container shell 18, burner 22, combustion chamber 23, first return flue 24, second return flue 25 and support frame 26, the inner side of the protective shell 16 is provided with heat preservation cotton 17, the inner side of the heat preservation cotton 17 is provided with the inner container shell 18, the heat preservation cotton 17 can heat preservation for the inner container shell 18, the protective shell 16 can prevent people from directly contacting the inner container shell 18 and being scalded, the inner bottom end of the inner container shell 18 is provided with the burner 22, the lower side of the right end of the protective shell 16 is provided with the air inlet pipe 4, the left end of the air inlet pipe 4 penetrates the protective shell 16, heat preservation cotton 17 and inner container shell 18 in sequence and is connected with the burner 22, the top end of the burner 22 is provided with the combustion chamber 23, the upper and lower ends of the combustion chamber 23 are symmetrically provided with support frames 26, the top end of the left side of the support frame 26 is provided with a plurality of first return flues 24, the top end of the right side of the support frame 26 is provided with a plurality of second return flues 25, the interiors of the two support frames 26 are provided with cavities, the cavity in the upper support frame 26 of the combustion chamber 23 is communicated with the upper ends of all the first return flues 24 and the top end of the combustion chamber 23, the cavity in the lower support frame 26 of the combustion chamber 23 is communicated with the lower ends of all the first return flues 24 and the second return flues 25, when the burner 22 works, natural gas is combusted in the combustion chamber 23, the burned waste gas enters the first return flue 24 through the cavity of the upper support frame 26 of the combustion chamber 23, enters the cavity of the lower support frame 26 of the combustion chamber 23 through the first return flue 24, enters the filter box 5 through the second return flue 25, and is finally discharged from the left and right ends of the filter box 5, when the waste gas passes through the first return flue 24 and the second return flue 25, the heat in the waste gas can heat the water in the inner container shell 18, which fully recovers the heat in the waste gas and improves the thermal efficiency, the front end of the protective shell 16 is connected with the shell 1, the front end of the shell 1 is provided with the operation panel 2, the front end of the protective shell 16 is provided with the water inlet pipe 3, the water inlet pipe 3 is in Z-shaped trend and is coiled at the front end of the protective shell 16, the water inlet pipe 3 is coiled at the front end of the protective shell in Z-shaped manner, when water flows through the water inlet pipe 3, the temperature of the front end of the protective shell 16 can be reduced to prevent people from being scalded when contacting the protective shell 16, the water inlet of the lower part of the water inlet pipe 3 is connected with the water pump 11, the water inlet of the water pump 11 penetrates the right end of the shell 1, the top end of the water inlet pipe 3 is connected with the T pipe 13, the rear end of the T pipe 13 penetrates the protective shell 16, heat preservation cotton 17 and inner container shell 18 from front to back in sequence, the lower part of the rear end of the protective shell 16 is provided with the water outlet pipe 9, the water outlet pipe 9 is provided with a control switch, the front end of the water outlet pipe 9 penetrates the protective shell 16, heat preservation cotton 17 and inner container shell 18 from back to front in sequence, the burner 22 and the water pump 11 are electrically connected with the operation panel 2, the start and stop of the burner 22 and the water pump 11 can be controlled through the operation panel 2.

[0026] AsFigure 4 and Figure 5 As shown in FIG. 6 and FIG. 7, the water heating device further comprises a winding tape 19, a servo motor 20 and a telescopic sleeve 21, the inner bottom end of the inner shell 18 is provided with the telescopic sleeve 21, the telescopic sleeve 21 has three sleeves in total, the adjacent two sleeves are connected together through sliding, the right end of the upper end support frame 26 of the combustion chamber 23 is provided with the servo motor 20, the servo motor 20 is electrically connected with the operation panel 2, the output shaft of the servo motor 20 is provided with the winding tape 19, the bottom end of the winding tape 19 is connected with the innermost sleeve of the telescopic sleeve 21, the operation panel 2 can control the start and stop of the servo motor 20, if people only need to heat a small amount of water, the servo motor 20 can be selected to be turned on on the operation panel 2, the servo motor 20 rotates to wind up the winding tape 19, the winding tape 19 drives the innermost sleeve of the telescopic sleeve 21 to rise, the adjacent sleeve is pulled to move upward by the innermost sleeve, and finally the innermost sleeve rises to the inner side of the upper part of the inner shell 18, when the water pump 11 draws water to fill the telescopic sleeve 21, the water is stopped, and the burner 22 is opened to heat the water in the telescopic sleeve 21.

[0027] As shown in FIG. 8 and FIG. 9, the water outlet pipe 9 is a U-shaped pipe, the lower water outlet of the water outlet pipe 9 is communicated with the inner shell 18, and the upper water outlet of the water outlet pipe 9 is communicated with the outermost sleeve of the telescopic sleeve 21, when the telescopic sleeve 21 is used to heat a small amount of water, the control switch in the water outlet pipe 9 is opened, and hot water flows out from the lower water outlet of the water outlet pipe 9. Figure 4 As shown in FIG. 10 and FIG. 11, the water heating device further comprises a filter box 5, the top end of the protective shell 16 is provided with the filter box 5, the bottom end of the filter box 5 is in contact with the top end of the outer shell 1, the top ends of all the second return flue pipes 25 are sequentially penetrated from bottom to top through the inner shell 18, the heat preservation cotton 17 and the protective shell 16 and communicated with the air inlet of the filter box 5, the filter box 5 can effectively filter the waste gas after combustion, and reduce environmental pollution.

[0028] Figure 1 As shown in FIG. 12 and FIG. 13, the water heating device further comprises a turnover door 10 and a magnet piece 1001, the left end of the outer shell 1 is hinged with the turnover door 10, the turnover door 10 is provided with a ferrous protrusion, the left front side of the inner shell 18 is provided with the magnet piece 1001, the ferrous protrusion and the magnet piece 1001 can be magnetically attracted together, if the water inlet pipe 3 fails, the turnover door 10 can be rotated to open, enter the outer shell 1, and repair the water inlet pipe 3, after the repair is completed, the turnover door 10 is rotated to close, and the ferrous protrusion and the magnet piece 1001 are automatically attached. Figure 4 As shown in FIG. 14 and FIG. 15, the water heating device further comprises a filter box 5, the top end of the protective shell 16 is provided with the filter box 5, the bottom end of the filter box 5 is in contact with the top end of the outer shell 1, the top ends of all the second return flue pipes 25 are sequentially penetrated from bottom to top through the inner shell 18, the heat preservation cotton 17 and the protective shell 16 and communicated with the air inlet of the filter box 5, the filter box 5 can effectively filter the waste gas after combustion, and reduce environmental pollution.

[0029] Figure 2 As shown in FIG. 16 and FIG. 17, the water heating device further comprises a turnover door 10 and a magnet piece 1001, the left end of the outer shell 1 is hinged with the turnover door 10, the turnover door 10 is provided with a ferrous protrusion, the left front side of the inner shell 18 is provided with the magnet piece 1001, the ferrous protrusion and the magnet piece 1001 can be magnetically attracted together, if the water inlet pipe 3 fails, the turnover door 10 can be rotated to open, enter the outer shell 1, and repair the water inlet pipe 3, after the repair is completed, the turnover door 10 is rotated to close, and the ferrous protrusion and the magnet piece 1001 are automatically attached. Figure 3 As shown in FIG. 18 and FIG. 19, the water heating device further comprises a filter box 5, the top end of the protective shell 16 is provided with the filter box 5, the bottom end of the filter box 5 is in contact with the top end of the outer shell 1, the top ends of all the second return flue pipes 25 are sequentially penetrated from bottom to top through the inner shell 18, the heat preservation cotton 17 and the protective shell 16 and communicated with the air inlet of the filter box 5, the filter box 5 can effectively filter the waste gas after combustion, and reduce environmental pollution.

[0030] Figure 2 As shown in FIG. 20 and FIG. 21, the water heating device further comprises a turnover door 10 and a magnet piece 1001, the left end of the outer shell 1 is hinged with the turnover door 10, the turnover door 10 is provided with a ferrous protrusion, the left front side of the inner shell 18 is provided with the magnet piece 1001, the ferrous protrusion and the magnet piece 1001 can be magnetically attracted together, if the water inlet pipe 3 fails, the turnover door 10 can be rotated to open, enter the outer shell 1, and repair the water inlet pipe 3, after the repair is completed, the turnover door 10 is rotated to close, and the ferrous protrusion and the magnet piece 1001 are automatically attached. Figure 3 ​​​The fire nozzle 6, the fire pipe 7 and the temperature sensor 15 are also shown. The top end of the T-shaped pipe 13 is connected with the electric control valve 14, the top end of the electric control valve 14 is connected with the fire pipe 7, the top end of the fire pipe 7 is connected with the fire nozzle 6, the bottom end of the front side of the filter box 5 is provided with the temperature sensor 15, the temperature sensor 15 penetrates the top end of the outer shell 1 and is located in the inside of the outer shell 1. If the temperature sensor 15 detects that the temperature of the front end of the protective shell 16 is too high, the temperature sensor 15 will transmit a signal to the operation panel 2, and the operation panel 2 will open the water pump 11 and the electric control valve 14. Water is sprayed from the fire nozzle 6 through the fire pipe 7, and the outside of the protective shell 16 is wetted to reduce the temperature of the surface of the protective shell 16.

[0031] Before people use the gas boiler, the water inlet of the water pump 11 needs to be connected with the water pool outside, the gas pipeline needs to be connected with the gas inlet pipe 4, and the water pump 11 is selected to be opened on the operation panel 2. The water pump 11 pumps the water in the water pool, and the water flows into the inner shell 18 from the T-shaped pipe 13 through the water inlet pipe 3 and falls into the telescopic sleeve 21. When the telescopic sleeve 21 is full of water, the water will overflow from the top end of the telescopic sleeve 21 and flow into the inner shell 18. (At this time, the telescopic sleeve 21 has not been pulled up, which is not shown in the figure.) After the water filling work is completed, the burner 22 is selected to be opened on the operation panel 2. Natural gas enters the combustion chamber 23 through the gas inlet pipe 4 and the burner 22. The natural gas burns in the combustion chamber 23 to generate heat, which heats the water in the inner shell 18. The exhaust gas after combustion enters the first return flue 24 through the cavity of the upper support frame 26 of the combustion chamber 23, enters the cavity of the lower support frame 26 of the combustion chamber 23 through the first return flue 24, and then enters the filter box 5 through the second return flue 25, and finally is discharged from the left and right ends of the filter box 5. In this process, the heat in the exhaust gas can heat the water in the inner shell 18 when the exhaust gas passes through the first return flue 24 and the second return flue 25. The control switch in the water outlet pipe 9 is opened, and hot water flows out from the lower outlet of the water outlet pipe 9. If people only need to heat a small amount of water, the servo motor 20 can be selected to be opened on the operation panel 2. The servo motor 20 rotates to wind up the tape 19, the tape 19 drives the innermost sleeve of the telescopic sleeve 21 to rise, the adjacent sleeves are pulled up, and finally the innermost sleeve rises to the upper part of the inside of the inner shell 18 (refer to Figure 4 and Figure 5), when the water pump 11 extracts the water to fill the telescopic sleeve 21, stop adding water, open the burner 22 to heat the water in the telescopic sleeve 21, open the control switch in the water outlet pipe 9, and finally the hot water flows out from the upper water outlet of the water outlet pipe 9, in the process of heating the water, the heat preservation cotton 17 can heat preservation the inner container shell 18, the protection shell 16 can prevent people from being scalded by directly contacting the inner container shell 18, the water inlet pipe 3 is in a Z-shaped trend, and is coiled on the front of the protection shell 16, when water flows in the water inlet pipe 3, the temperature of the front end of the protection shell 16 can be reduced.

[0032] It should be understood that the above description is only for exemplary purposes and does not mean to limit the present application. Those skilled in the art will understand that the variations of the present application will be included in the scope of the claims herein.

Claims

1. A gas-fired boiler with protective function, comprising a protective shell (16), insulation cotton (17), an inner shell (18), and a burner (22), wherein the inner side of the protective shell (16) is provided with insulation cotton (17), the inner side of the insulation cotton (17) is provided with the inner shell (18), and the burner (22) is provided at the middle of the inner bottom end of the inner shell (18), characterized in that: The water pump (11), the T-shaped pipe (13), the electric control valve (14), the combustion chamber (23), the first return flue (24), the second return flue (25) and the support frame (26) are further included, the lower side of the right end of the protective shell (16) is provided with the air inlet pipe (4), the left end of the air inlet pipe (4) is sequentially penetrated through the protective shell (16), the heat preservation cotton (17) and the inner container shell (18) and is connected with the burner (22), the middle of the top end of the burner (22) is provided with the combustion chamber (23), the upper and lower ends of the combustion chamber (23) are symmetrically provided with the support frame (26), the top end of the left side of the support frame (26) is provided with a plurality of first return flues (24), the top end of the right side of the support frame (26) is provided with a plurality of second return flues (25), the front end of the protective shell (16) is connected with the shell (1), the front end of the protective shell (16) is provided with the water inlet pipe (3), the water inlet pipe (3) is connected with the water pump (11) at the water inlet of the lower part, the water inlet of the water pump (11) is penetrated through the right end of the shell (1), the top end of the water inlet pipe (3) is connected with the T-shaped pipe (13), the rear end of the T-shaped pipe (13) is sequentially penetrated through the protective shell (16), the heat preservation cotton (17) and the inner container shell (18) from front to back, the lower part of the rear end of the protective shell (16) is provided with the water outlet pipe (9), the water outlet pipe (9) is provided with a control switch, the front end of the water outlet pipe (9) is sequentially penetrated through the protective shell (16), the heat preservation cotton (17) and the inner container shell (18) from back to front.

2. A gas boiler with a protection function according to claim 1, characterized in that: The tape winding (19), the servo motor (20) and the telescopic sleeve (21) are further included, the inner bottom end of the inner container shell (18) is provided with the telescopic sleeve (21), the right end of the upper support frame (26) of the combustion chamber (23) is provided with the servo motor (20), the output shaft of the servo motor (20) is provided with the tape winding (19), the bottom end of the tape winding (19) is connected with the innermost sleeve of the telescopic sleeve (21).

3. A gas boiler with protection function according to claim 2, characterized in that: The telescopic sleeve (21) has three sleeves in total, and the two adjacent sleeves are connected together through sliding.

4. A gas boiler with protection according to claim 3, characterized in that: The water outlet pipe (9) is a U-shaped pipe, the lower water outlet of the water outlet pipe (9) is communicated with the inner container shell (18), and the upper water outlet of the water outlet pipe (9) is communicated with the outermost sleeve of the telescopic sleeve (21).

5. A gas boiler with protection according to claim 4, characterized in that: The cavities are arranged in the two support frames (26), the cavity in the upper support frame (26) of the combustion chamber (23) is communicated with the upper ends of all the first return flues (24) and the top end of the combustion chamber (23), and the cavity in the lower support frame (26) of the combustion chamber (23) is communicated with the lower ends of all the first return flues (24) and the second return flues (25).

6. A gas boiler with protection according to claim 5, characterized in that: The filter box (5) is further included, the top end of the protective shell (16) is provided with the filter box (5), the bottom end of the front side of the filter box (5) is in contact with the top end of the shell (1), and the top ends of all the second return flues (25) are sequentially penetrated through the inner container shell (18), the heat preservation cotton (17) and the protective shell (16) from bottom to top and communicated with the air inlet of the filter box (5).

7. A gas boiler with protection according to claim 6, characterized in that: The water inlet pipe (3) is in a Z-shaped trend and is coiled at the front end of the protective shell (16).

8. A gas boiler with protection according to claim 7, characterized in that: It also includes a turnover door (10) and a magnet piece (1001), the left end of the shell (1) is hinged with the turnover door (10), the turnover door (10) is provided with an iron bump, the left end of the front side of the inner container shell (18) is provided with the magnet piece (1001), and the iron bump and the magnet piece (1001) can be magnetically attracted together.

9. A gas boiler with protection according to claim 8, characterized in that: It also includes an operation panel (2), the front end of the shell (1) is provided with the operation panel (2), the burner (22), the water pump (11) and the servo motor (20) are electrically connected with the operation panel (2).

10. A gas boiler with protection according to claim 9, characterized in that: It also includes a fire nozzle (6), a fire pipe (7) and a temperature sensor (15), the top end of the T-shaped pipe (13) is connected with an electric control valve (14), the top end of the electric control valve (14) is connected with the fire pipe (7), the top end of the fire pipe (7) is connected with the fire nozzle (6), and the bottom end of the front side of the filter box (5) is provided with the temperature sensor (15), and the temperature sensor (15) penetrates through the top end of the shell (1) and is located in the inside of the shell (1).

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