Online detector capable of monitoring acetylene of transformer in real time

Abstract

The utility model provides an online detector capable of monitoring acetylene in a transformer in real time, which belongs to the technical field of transformers and comprises a box body, an oil-gas separation component, a gas detection component, a recycling component and a control component. The inner area of the box body is divided into an oil-gas separation area, a central control area and a recovery area which are mutually independent by the partition plates, the oil-gas separation assembly and the gas detection assembly are arranged in the oil-gas separation area, the circulation recovery assembly is arranged in the recovery area, and the control assembly is arranged in the central control area. The transformer oil is circularly detected and reported, the acetylene gas content in the transformer oil is monitored in real time, and the problems that an existing gas chromatographic analysis method needs sampling and laboratory analysis, acetylene gas of a transformer cannot be monitored online in real time, the detection period is long, and faults in the transformer cannot be found in time are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an online detector capable of monitoring acetylene in transformers in real time. Background Art

[0002] Transformers are key equipment in power systems and play a vital role in ensuring the normal operation of power systems and the quality of electric energy. However, transformers may fail during operation, such as overheating, arcing, short circuits, and other problems. These problems may cause the insulation material inside the transformer to decompose and produce harmful gases such as acetylene. Real-time monitoring of the operating status of the transformer, especially online detection of acetylene gas in the transformer, is of great significance for preventing and solving transformer failures.

[0003] At present, gas chromatography is the main method for detecting dissolved gases in transformer oil. However, this method has some limitations. It requires sampling and laboratory analysis, and cannot monitor the acetylene gas of the transformer online in real time. At the same time, the detection cycle is long, and it is impossible to detect the internal faults of the transformer in time. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides an online detector that can monitor transformer acetylene in real time, which is used to solve the above problems.

[0005] The utility model is achieved in this way:

[0006] An online detector capable of real-time monitoring of transformer acetylene comprises:

[0007] A box body, wherein a plurality of partition plates are arranged inside the box body, wherein the partition plates divide the inner area of ​​the box body into mutually independent oil-gas separation areas, central control areas and recovery areas, an oil inlet and an oil outlet are arranged on one side of the box body, and an exhaust port is arranged on the top of the box body;

[0008] An oil-gas separation assembly, comprising a separation box, a vacuum pump and an air extraction pipe, wherein the vacuum pump is arranged at the bottom of the box body, the separation box is arranged inside the oil-gas separation area near the oil inlet, the top of the separation box is connected to the vacuum pump through the air extraction pipe, and the top of the separation box is connected to the oil inlet through the oil inlet pipe;

[0009] A gas detection assembly, comprising a detection box, a micro air pump and a gas chromatograph, wherein the detection box is arranged inside the oil-gas separation area on one side close to the central control area, the separation box and the top of the detection box are connected through an air guide pipe, the micro air pump is arranged in the middle of the air guide pipe, the gas chromatograph is arranged inside the detection box, and the top of the detection box is connected to the exhaust port through an exhaust pipe;

[0010] A circulation recovery component, comprising a recovery oil tank, an electric oil pump and a pressure relief valve, wherein the recovery oil tank is arranged inside the recovery area, the recovery oil tank and the separation tank are connected through an oil pipe, the side of the separation tank close to the top is connected to the top of the recovery oil tank through a pressure balance pipe, the electric oil pump is arranged outside the box body, the electric oil pump is connected to the oil outlet, the oil outlet is connected to the recovery oil tank through the oil outlet pipe, and the pressure relief valve is arranged on the top of the recovery oil tank;

[0011] The control component includes a controller, and the controller is arranged inside the central control area.

[0012] In one embodiment of the utility model, a first solenoid valve is provided on the oil inlet pipe, a second solenoid valve is provided on the air extraction pipe, a first pressure gauge is provided on the top of the separation box, and a water level switch is provided inside the separation box.

[0013] In one embodiment of the utility model, the signal input ends of the first solenoid valve, the second solenoid valve and the vacuum pump are communicatively connected to the signal output end of the control, and the signal output ends of the first pressure gauge and the water level switch are communicatively connected to the signal input end of the controller.

[0014] In one embodiment of the utility model, a third solenoid valve and an oil-gas separator are respectively provided on the air duct, and the third solenoid valve and the oil-gas separator are arranged on the side close to the inlet end of the micro air pump, a second pressure gauge is arranged on the top of the detection box, and a fourth solenoid valve is arranged on the air duct.

[0015] In one embodiment of the utility model, the signal input ends of the third solenoid valve, the micro air pump and the fourth solenoid valve are communicatively connected to the signal output end of the control, and the signal output ends of the second pressure gauge and the gas chromatograph are communicatively connected to the signal input end of the controller.

[0016] In one embodiment of the utility model, the gas chromatograph is arranged on the top wall of the detection box, the air duct extends to the interior of the detection box, an air diffuser plate is arranged at the outlet of the air duct, and the air diffuser plate is located below the gas chromatograph.

[0017] In an embodiment of the utility model, a fifth solenoid valve is provided on the oil passage pipe, a sixth solenoid valve is provided on the pressure balance pipe, and a float-type liquid level sensor is provided inside the recovery oil tank.

[0018] In one embodiment of the utility model, the signal input ends of the fifth solenoid valve, the sixth solenoid valve and the electric oil pump are communicatively connected to the signal output end of the controller, and the signal output end of the float-type liquid level sensor is communicatively connected to the signal input end of the controller.

[0019] In one embodiment of the utility model, an alarm is arranged on the top of the box, and a communication antenna is arranged on the side of the box. Both the alarm and the communication antenna are electrically connected to the controller.

[0020] In an embodiment of the present utility model, the direction of the pressure relief valve is from the outside of the recovery oil tank to the inside.

[0021] The beneficial effects of the utility model are as follows: the transformer oil is circulated and detected and reported through the oil-gas separation component and the gas detection component, and the transformer oil that has precipitated harmful gas enters the circulation recovery component. When a certain volume is collected, the oil is pumped back into the oil pillow of the transformer for recycling through the electric oil pump, and the above components are integrated into a box, which is convenient for real-time monitoring of possible failures of the transformer during operation, and solves the problem that the existing gas chromatography analysis method needs to take samples and conduct laboratory analysis, and cannot monitor the acetylene gas of the transformer online in real time, and the detection cycle is long, and the internal failure of the transformer cannot be discovered in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0025] Figure 3 This is a structural schematic diagram of the oil and gas separation component of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the gas detection component of the utility model;

[0027] Figure 5 It is a structural schematic diagram of the recycling component of the utility model;

[0028] Figure 6 This is a communication block diagram of the utility model.

[0029] In the figure: 10, box body; 11, partition plate; 12, oil-gas separation area; 13, recovery area; 14, central control area; 15, oil inlet; 16, oil outlet; 17, exhaust port; 20, oil-gas separation component; 21, separation box; 22, oil inlet pipe; 221, first solenoid valve; 23, vacuum pump; 24, exhaust pipe; 241, second solenoid valve; 25, first pressure gauge; 26, water level switch; 30, gas detection component; 31, detection box; 32, air guide pipe; 321, third solenoid valve; 322, dispersion Gas plate; 33. Oil-gas separator; 34. Micro air pump; 35. Gas chromatograph; 36. Second pressure gauge; 37. Exhaust pipe; 371. Fourth solenoid valve; 40. Circulation recovery component; 41. Recovery oil tank; 42. Oil pipe; 421. Fifth solenoid valve; 43. Pressure balance pipe; 431. Sixth solenoid valve; 44. Float-type liquid level sensor; 45. Pressure relief valve; 46. Oil outlet pipe; 47. Electric oil pump; 50. Control component; 51. Controller; 52. Communication antenna; 60. Alarm. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1As shown, the utility model provides an online detector for real-time monitoring of transformer acetylene, including a box body 10. A plurality of partition plates 11 are arranged inside the box body 10. The partition plates 11 divide the inner area of ​​the box body 10 into mutually independent oil-gas separation areas 12, central control areas 14 and recovery areas 13. The oil detection process is divided by dividing the areas, which is convenient for staff to operate. An oil inlet 15 and an oil outlet 16 are respectively arranged on one side of the box body 10, and an exhaust port 17 is arranged on the top of the box body 10. The oil inlet 15 is connected to the transformer oil tank, and the oil outlet 16 is connected to the oil pillow of the transformer. After the oil in the transformer oil tank is detected, it is convenient to flow back to the transformer for recycling.

[0033] like Figure 2 As shown, the oil-gas separation component 20 includes a separation box 21, a vacuum pump 23 and an exhaust pipe 24. The vacuum pump 23 is arranged at the bottom of the box body 10, and the separation box 21 is arranged inside the oil-gas separation area 12 near the oil inlet 15. The top of the separation box 21 is connected with the vacuum pump 23 through the exhaust pipe 24, and a second solenoid valve 241 is arranged on the exhaust pipe 24. The top of the separation box 21 is connected with the oil inlet 15 through the oil inlet pipe 22, and a first solenoid valve 221 is arranged on the oil inlet pipe 22. A first pressure gauge 25 is arranged on the top of the separation box 21, and the first pressure gauge 25 is used to detect the vacuum pressure inside the separation box 21, so as to control the start and stop of the vacuum pump 23. A water level switch 26 is arranged inside the separation box 21, which is used to judge the oil height inside the separation box 21, so as to notify the controller 51 to control the closing of the first solenoid valve 221.

[0034] In this embodiment, the signal input ends of the first solenoid valve 221 , the second solenoid valve 241 and the vacuum pump 23 are communicatively connected to the signal output end of the control, and the signal output ends of the first pressure gauge 25 and the water level switch 26 are communicatively connected to the signal input end of the controller 51 .

[0035] like Figure 3As shown, the gas detection assembly 30 includes a detection box 31, a micro air pump 34 and a gas chromatograph 35. The detection box 31 is arranged on the side of the oil-gas separation area 12 near the central control area 14. The separation box 21 and the top of the detection box 31 are connected through an air guide pipe 32. The air guide pipe 32 is respectively provided with a third solenoid valve 321, an oil-gas separator 33 and a micro air pump 34. The third solenoid valve 321 and the oil-gas separator 33 are arranged on the side near the inlet end of the micro air pump 34. 3 isolates water vapor in the vacuum degassing gas to prevent water gasoline gas from entering the micro air pump 34 and the gas chromatograph 35 to pollute the equipment. The gas chromatograph 35 is arranged inside the detection box 31. The top of the detection box 31 is provided with a second pressure gauge 36. The second pressure gauge 36 is used to detect the vacuum pressure inside the detection box 31, so as to control the start and stop of the micro air pump 34. The top of the detection box 31 is connected with the exhaust port 17 through the exhaust pipe 37. The air guide pipe 32 is provided with a fourth electromagnetic valve 371.

[0036] In this embodiment, the gas chromatograph 35 is arranged on the top wall of the detection box 31, and the air duct 32 extends to the interior of the detection box 31. A diffuser plate 322 is arranged at the outlet of the air duct 32. The diffuser plate 322 is located below the gas chromatograph 35. Since the density of acetylene gas is low, it will drift to the top of the detection box 31. Such a design can make the gas chromatograph 35 fully contact with the acetylene gas, and the detection is more accurate.

[0037] In this embodiment, the signal input ends of the third solenoid valve 321, the oil-gas separator 33, the micro air pump 34 and the fourth solenoid valve 371 are communicatively connected to the signal output ends of the control, and the signal output ends of the second pressure gauge 36 and the gas chromatograph 35 are communicatively connected to the signal input end of the controller 51.

[0038] like Figure 4As shown, the recycling component 40 includes a recycling oil tank 41, an electric oil pump 47 and a pressure relief valve 45. The recycling oil tank 41 is arranged inside the recycling area 13. The recycling oil tank 41 and the separation box 21 are connected through an oil pipe 42. A fifth solenoid valve 421 is arranged on the oil pipe 42. The side of the separation box 21 near the top is connected to the top of the recycling oil tank 41 through a pressure balance pipe 43. A sixth solenoid valve 431 is arranged on the pressure balance pipe 43. The fifth solenoid valve 421 and the sixth solenoid valve 431 are opened synchronously to keep the internal pressure of the separation box 21 and the recycling box the same, so that the oil can flow into the recycling box. A float-type liquid level sensor 44 is arranged inside the recovery oil tank 41, and an electric oil pump 47 is arranged on the outside of the tank body 10. The electric oil pump 47 is connected with the oil outlet 16, and the oil outlet 16 is connected with the recovery oil tank 41 through an oil outlet pipe 46. The float-type liquid level sensor 44 is used to recover the oil height inside the tank. When the threshold is reached, the electric oil pump 47 is started by the controller 51. The pressure relief valve 45 is arranged on the top of the recovery oil tank 41. The direction of the pressure relief valve 45 is to flow from the outside of the recovery oil tank 41 to the inside, so as to avoid the internal pressure of the recovery oil tank 41 being less than the external pressure, resulting in the electric oil pump 47 being unable to pump oil.

[0039] like Figure 5 As shown, the control component 50 includes a controller 51, which is arranged inside the central control area 14. An alarm 60 is arranged on the top of the box 10, and a communication antenna 52 is arranged on the side of the box 10. The alarm 60 and the communication antenna 52 are both electrically connected to the controller 51. The alarm 60 is used to release sound and light signals when the data exceeds the standard, prompting the staff to carry out timely inspection and troubleshooting. The communication antenna 52 is used for the remote connection between the detector and the upper background management system to realize the transmission of monitoring data and alarm signals and improve the level of power grid management.

[0040] In this embodiment, the signal input ends of the fifth solenoid valve 421 , the sixth solenoid valve 431 and the electric oil pump 47 are communicatively connected to the signal output end of the controller 51 , and the signal output end of the float type liquid level sensor 44 is communicatively connected to the signal input end of the controller 51 .

[0041] Specifically, the working principle of the online detector that can monitor the acetylene content of the transformer in real time is as follows: the oil inlet 15 on the box body 10 is connected to the transformer oil tank, and the oil outlet 16 is connected to the oil pillow of the transformer. The oil in the transformer oil tank is subjected to gas chromatography analysis by means of a circulation detection method, and the analysis data is transmitted to the remote terminal of the upper background management system to achieve the purpose of monitoring the acetylene content of the transformer. The steps of detecting the transformer oil entering the box body 10 are described below (the initial state of all solenoid valves is closed), and the specific steps are as follows:

[0042] s1. Open the first solenoid valve 221, the second solenoid valve 241 and the vacuum pump 23 at the same time, and make the internal air pressure of the separation box 21 lower than the air pressure of the transformer oil tank through the vacuum pump 23, so that the oil in the transformer oil tank flows into the separation box 21;

[0043] s2. When the water level switch 26 in the separation box 21 detects that the oil level has reached the set height, it sends a signal to the controller 51. The controller 51 controls the first solenoid valve 221 to close. At this time, the internal pressure of the separation box 21 increases with the continuous operation of the vacuum pump 23. When the first pressure gauge 25 reaches the set threshold, it sends a signal to the controller 51. The controller 51 controls the vacuum pump 23 and the second solenoid valve 241 to close and starts the static countdown.

[0044] s3, standing for a period of time (the time interval is set to 2 hours in this embodiment), the acetylene gas dissolved in the oil is precipitated by vacuum degassing, the controller 51 controls the third solenoid valve 321 and the micro air pump 34 to open, so that the gas precipitated in the separation box 21 flows into the detection box 31, wherein the oil-gas separator 33 is used to isolate the water vapor in the precipitated gas, and the micro air pump 34 is used to pressurize the precipitated gas to improve the circulation fluidity of the precipitated gas;

[0045] s4, the second pressure gauge 36 detects that the internal pressure of the detection box 31 reaches the threshold value, notifies the controller 51 to close the third solenoid valve 321 and the micro air pump 34, and enters the static countdown so that the gas chromatograph 35 can analyze the gas (the analysis time is set to 20 minutes in this embodiment);

[0046] s5-1. After the gas chromatograph 35 completes the analysis, it transmits the analysis result to the controller 51. The controller 51 is remotely connected to the upper background management system through the communication antenna 52 and transmits the result. At the same time, when the detection data exceeds the standard, the controller 51 will also control the alarm 60 to release sound and light signals to remind the on-site staff.

[0047] s5-2, at the same time, the controller 51 controls the fourth solenoid valve 371 to open, so that the gas inside the detection box 31 is discharged, and after a certain period of time, the fourth solenoid valve 371 is closed again to wait for the next detection;

[0048] s6, the controller 51 controls the fifth solenoid valve 421 and the sixth solenoid valve 431 to open, the fifth solenoid valve 421 allows the oil in the separation box 21 to flow into the recovery tank 41, and the sixth solenoid valve 431 is used to balance the internal air pressure of the separation box 21 and the recovery tank 41, so that the oil flows smoothly into the recovery tank 41. After a certain period of time, the controller 51 controls the fifth solenoid valve 421 and the sixth solenoid valve 431 to close;

[0049] s7. When the float-type liquid level sensor 44 detects that the oil level in the recovery oil tank 41 reaches a threshold, it sends a signal to the controller 51. The controller 51 controls the electric oil pump 47 to pump the oil in the recovery oil tank 41 into the oil pillow of the transformer.

[0050] Through the above device, the transformer oil is cyclically detected and reported, and the acetylene gas content in the transformer oil is monitored in real time, which solves the problem that the existing gas chromatography analysis method requires sampling and laboratory analysis, and cannot monitor the acetylene gas of the transformer in real time online. At the same time, the detection cycle is long and the internal fault of the transformer cannot be discovered in time.

[0051] It should be noted that the specific models and specifications of the vacuum pump 23, water level switch 26, micro air pump 34, gas chromatograph 35, float-type liquid level sensor 44, electric oil pump 47, controller 51 and each solenoid valve and pressure gauge need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in the field, so it will not be described in detail.

[0052] The power supply and principles of the vacuum pump 23, water level switch 26, micro air pump 34, gas chromatograph 35, float type liquid level sensor 44, electric oil pump 47, controller 51 and each solenoid valve and pressure gauge are clear to those skilled in the art and will not be described in detail here.

[0053] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. An online detector capable of real-time monitoring of transformer acetylene, characterized in that: include: A box (10), wherein a plurality of partition plates (11) are arranged inside the box (10), wherein the partition plates (11) divide the inner area of ​​the box (10) into mutually independent oil-gas separation areas (12), central control areas (14) and recovery areas (13); an oil inlet (15) and an oil outlet (16) are respectively arranged on one side of the box (10), and an exhaust port (17) is arranged on the top of the box (10); An oil-gas separation component (20) comprises a separation box (21), a vacuum pump (23) and an air extraction pipe (24), wherein the vacuum pump (23) is arranged at the bottom of the box body (10), the separation box (21) is arranged inside the oil-gas separation area (12) near the oil inlet (15), the top of the separation box (21) is connected to the vacuum pump (23) through the air extraction pipe (24), and the top of the separation box (21) is connected to the oil inlet (15) through the oil inlet pipe (22); A gas detection assembly (30), comprising a detection box (31), a micro air pump (34) and a gas chromatograph (35), wherein the detection box (31) is arranged inside the oil-gas separation area (12) on a side close to the central control area (14), the separation box (21) and the top of the detection box (31) are connected via an air guide pipe (32), the micro air pump (34) is arranged in the middle of the air guide pipe (32), the gas chromatograph (35) is arranged inside the detection box (31), and the top of the detection box (31) is connected to the exhaust port (17) via an exhaust pipe (37); A circulation recovery component (40), comprising an oil recovery tank (41), an electric oil pump (47) and a pressure relief valve (45), wherein the oil recovery tank (41) is arranged inside the recovery area (13), the oil recovery tank (41) and the separation tank (21) are connected via an oil pipe (42), the side of the separation tank (21) close to the top is connected to the top of the oil recovery tank (41) via a pressure balance pipe (43), the electric oil pump (47) is arranged outside the box body (10), the electric oil pump (47) is connected to the oil outlet (16), the oil outlet (16) and the oil recovery tank (41) are connected via an oil outlet pipe (46), and the pressure relief valve (45) is arranged at the top of the oil recovery tank (41); The control component (50) comprises a controller (51), wherein the controller (51) is arranged inside the central control area (14).

2. The online detector capable of real-time monitoring of transformer acetylene according to claim 1 is characterized in that: The oil inlet pipe (22) is provided with a first solenoid valve (221), the air extraction pipe (24) is provided with a second solenoid valve (241), the top of the separation box (21) is provided with a first pressure gauge (25), and the interior of the separation box (21) is provided with a water level switch (26).

3. The online detector capable of real-time monitoring of transformer acetylene according to claim 2 is characterized in that: The signal input ends of the first solenoid valve (221), the second solenoid valve (241) and the vacuum pump (23) are communicatively connected to the signal output end of the control, and the signal output ends of the first pressure gauge (25) and the water level switch (26) are communicatively connected to the signal input end of the controller (51).

4. The online detector capable of real-time monitoring of transformer acetylene according to claim 1 is characterized in that: The air guide pipe (32) is provided with a third solenoid valve (321) and an oil-gas separator (33), respectively; the third solenoid valve (321) and the oil-gas separator (33) are arranged on a side close to an inlet end of the micro air pump (34); a second pressure gauge (36) is arranged on the top of the detection box (31); and a fourth solenoid valve (371) is arranged on the air guide pipe (32).

5. The online detector capable of real-time monitoring of transformer acetylene according to claim 4 is characterized in that: The signal input ends of the third solenoid valve (321), the micro air pump (34) and the fourth solenoid valve (371) are communicatively connected to the signal output end of the control, and the signal output ends of the second pressure gauge (36) and the gas chromatograph (35) are communicatively connected to the signal input end of the controller (51).

6. The online detector capable of real-time monitoring of transformer acetylene according to claim 1 is characterized in that: The gas chromatograph (35) is arranged on the top wall of the detection box (31), the air guide pipe (32) extends to the interior of the detection box (31), and an air diffuser plate (322) is arranged at the outlet of the air guide pipe (32), and the air diffuser plate (322) is located below the gas chromatograph (35).

7. The online detector capable of real-time monitoring of transformer acetylene according to claim 1 is characterized in that: The oil passage pipe (42) is provided with a fifth solenoid valve (421), the pressure balance pipe (43) is provided with a sixth solenoid valve (431), and a float type liquid level sensor (44) is provided inside the oil recovery tank (41).

8. The online detector capable of real-time monitoring of transformer acetylene according to claim 7 is characterized in that: The signal input ends of the fifth solenoid valve (421), the sixth solenoid valve (431) and the electric oil pump (47) are communicatively connected to the signal output end of the controller (51), and the signal output end of the float type liquid level sensor (44) is communicatively connected to the signal input end of the controller (51).

9. The online detector capable of real-time monitoring of transformer acetylene according to claim 1, characterized in that: An alarm (60) is arranged on the top of the box (10), and a communication antenna (52) is arranged on the side of the box (10); the alarm (60) and the communication antenna (52) are both electrically connected to the controller (51).

10. The online detector capable of real-time monitoring of transformer acetylene according to claim 1, characterized in that: The direction of the pressure relief valve (45) is from the outside of the oil recovery tank (41) to the inside.

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