A goose neck radiator and oil-free pillow transformer using the same

Abstract

The application discloses a swan neck radiator and an oil-free pillow transformer using the same, and belongs to the technical field of transformers. The swan neck radiator and the oil-free pillow transformer are characterized in that a gas collecting box is arranged on the exhaust port of the upper oil collecting pipe of the swan neck radiator, an oil level meter is installed on the gas collecting box, the gas collecting box is filled with oil before the radiator operates, when gas enters the swan neck radiator, the gas will enter the gas collecting box, at this time, the oil level in the gas collecting box will decrease, the swan neck radiator is ensured to be filled with transformer oil, and the oil level in the gas collecting box is monitored through the oil level meter, so that the transformer operation abnormality can be found in time, and the normal operation of the transformer is ensured; through the above innovative design of the swan neck radiator, the swan neck radiator can be used on the oil-free pillow transformer, the overall size of the transformer is more compact under the condition that the heat dissipation performance of the transformer is ensured, and compared with the transformer with the oil pillow, the manufacturing cost of the transformer is greatly reduced.

Description

Technical Field

[0001] This invention relates to a transformer radiator, and more specifically, to a gooseneck radiator and an oil-free transformer using the radiator. Background Technology

[0002] Oil-immersed transformers use transformer oil as both insulation and cooling medium, requiring a radiator to cool the oil. The heat dissipation performance of existing plate-type radiators is related to the number and size of the fins. To improve transformer heat dissipation, the size of the matching radiators is increasing, leading to larger transformer dimensions and increased overall transformer equipment costs.

[0003] For example Figure 1 The oil-free transformer shown, such as the American-style transformer, does not have an oil conservator on top. It addresses the thermal expansion and contraction of the transformer oil by leaving an air gap at the top of the transformer tank 1. The plate-type radiator 2 is installed on the side wall of the transformer tank 1 via its straight upper and lower oil collection pipes. An oil level gauge 1a is installed inside the transformer tank 1 at a position higher than the plate-type radiator 2. During operation, the oil level in the transformer tank 1 must be kept above the highest point of the plate-type radiator 2. To improve the transformer's heat dissipation, the number of plates in the plate-type radiator 2 must be increased, increasing the lateral dimension of the plate-type radiator 2 and consequently increasing the overall size of the transformer. When the user's requirements for the lateral dimensions of the transformer cannot be met, the height of the plate-type radiator 2 is often increased by increasing the height of the transformer tank, thus increasing the center-to-center distance of the radiators. This design increases the weight of the transformer tank and the amount of transformer oil used, significantly increasing costs.

[0004] The height of a gooseneck radiator can exceed the height of the transformer tank, increasing the heat dissipation area and raising the heat dissipation center without increasing the number of fins, thus providing better heat dissipation performance compared to traditional plate radiators. However, the presence of gas inside the radiator is critical, as it would prevent proper heat dissipation. In oil-conservatorless transformers, the internal pressure can be positive or negative depending on the load and ambient temperature. Therefore, when using gooseneck radiators, negative pressure is more likely to exist at the highest point of the radiator. Thus, when using gooseneck radiators, it is necessary to address the issues of gas entering the radiator due to transportation vibrations and the negative pressure created by the difference in oil level between the radiator and the transformer tank. For this reason, gooseneck radiators are currently only used on transformers with oil conservator systems, such as the "A Gooseneck Fin Transformer" disclosed in Chinese Patent No. ZL202022271037.1. In this design, the lowest oil level in the transformer's oil conservator (or oil tank) is higher than the oil level at the highest point of the gooseneck radiator, ensuring that there is no negative pressure inside the radiator.

[0005] Therefore, the existing gooseneck radiators cannot be used in oil-free transformers, and thus the heat dissipation advantages of gooseneck radiators cannot be utilized in oil-free transformers. Summary of the Invention

[0006] 1. The technical problem that the invention aims to solve

[0007] The purpose of this invention is to overcome the shortcomings of existing gooseneck radiators, which cannot be used in oil-free transformers, and to provide a gooseneck radiator and an oil-free transformer using the radiator. The technical solution of this invention involves installing a gas collection box at the exhaust port of the upper oil collection pipe of the gooseneck radiator, and installing an oil level gauge on the gas collection box. Before the radiator operates, the gas collection box is filled with oil. When gas enters the gooseneck radiator, the gas will enter the gas collection box, causing the oil level in the gas collection box to drop, ensuring that the gooseneck radiator is filled with transformer oil. The oil level gauge monitors the oil level in the gas collection box, facilitating timely detection of transformer malfunctions and ensuring normal transformer operation. Through the above innovative design of the gooseneck radiator, the gooseneck radiator... This invention enables the use of oil-free transformers, ensuring good heat dissipation while making the overall size of the transformer more compact and significantly reducing manufacturing costs compared to transformers with oil conservators. Furthermore, the invention incorporates a valve between the upper oil collection pipe of the gooseneck radiator and the upper interface of the transformer tank. This valve is closed during transformer transportation to prevent gas from entering the gooseneck radiator due to shaking during transport. The valve is opened before the transformer is in place and put into operation, greatly simplifying on-site installation of oil-free transformers using gooseneck radiators. Moreover, the fact that only the valve needs to be installed at the upper interface of the transformer tank reduces the number of valves used, further contributing to lower manufacturing costs.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0010] The present invention discloses a gooseneck radiator, comprising a heat sink, an upper oil collecting pipe, and a lower oil collecting pipe. The upper oil collecting pipe is installed on the upper part of the heat sink, and the lower oil collecting pipe is installed on the lower part of the heat sink. The upper oil collecting pipe is a gooseneck pipe. The radiator also includes a vent box and an oil level gauge. The vent box is connected to the exhaust port of the upper oil collecting pipe, and the oil level gauge is installed on the vent box for monitoring the oil level in the vent box.

[0011] Furthermore, the upper oil collection pipe includes a horizontal straight pipe, a riser pipe, and a short connecting pipe. The horizontal straight pipe is installed on the upper part of the heat sink. One end of the horizontal straight pipe is connected to the short connecting pipe through the riser pipe. The horizontal straight pipe and the riser pipe form an "L" shape structure. The air collection box is connected to the exhaust port of the horizontal straight pipe.

[0012] Furthermore, the short connecting pipe is provided with an upper flange at its opening, and the lower oil gathering pipe is provided with a lower flange at its opening.

[0013] Furthermore, the gas collection box is connected to the exhaust port of a horizontal straight pipe via a gas collection pipe.

[0014] Furthermore, the oil level gauge is connected to the alarm system and issues an alarm signal when the oil level in the gas collection box drops to the lower limit.

[0015] The present invention discloses an oil-free confined transformer using a gooseneck radiator, comprising a transformer body, wherein the transformer body is an oil-free confined transformer, and the upper part of the side wall of the oil tank of the transformer body is provided with an upper interface and the lower part is provided with a lower interface, and further comprising the aforementioned gooseneck radiator, wherein the upper oil collection pipe of the gooseneck radiator is connected to the upper interface of the oil tank, and the lower oil collection pipe of the gooseneck radiator is connected to the lower interface of the oil tank.

[0016] Furthermore, a valve is also provided between the upper oil collection pipe and the upper interface.

[0017] Furthermore, the liquid level in the oil tank of the transformer body is lower than the height of the top of the upper oil collection pipe of the gooseneck radiator.

[0018] Furthermore, the gooseneck radiator has at least one set of heat dissipation fins. When there are two or more sets of heat dissipation fins, the sets of heat dissipation fins are arranged side by side. The top of each set of heat dissipation fins is connected to the upper part of the oil tank of the transformer body through an upper oil collection pipe, and the bottom of each set of heat dissipation fins is connected to the lower part of the oil tank of the transformer body through a lower oil collection pipe. The gas collection box is connected to the exhaust port of each upper oil collection pipe through a gas collection pipe.

[0019] 3. Beneficial effects

[0020] Compared with existing known technologies, the technical solution provided by this invention has the following significant advantages:

[0021] (1) The present invention provides a gooseneck radiator and an oil-free transformer using the radiator. A gas collection box is installed on the exhaust port of the upper oil collection pipe of the gooseneck radiator, and an oil level gauge is installed on the gas collection box. Before the radiator is put into operation, the gas collection box is filled with oil. When gas enters the gooseneck radiator, the gas will enter the gas collection box. At this time, the oil level in the gas collection box will drop, ensuring that the gooseneck radiator is filled with transformer oil. The oil level gauge is used to monitor the oil level in the gas collection box, which facilitates timely detection of abnormal transformer operation and ensures normal operation of the transformer. Through the above-mentioned innovative design of the gooseneck radiator, it is possible to use the gooseneck radiator on an oil-free transformer. While ensuring the heat dissipation performance of the transformer, the overall size of the transformer is more compact, and the manufacturing cost of the transformer is greatly reduced compared with a transformer with an oil conservator.

[0022] (2) A gooseneck radiator and an oil-free transformer using the radiator of the present invention, wherein the upper oil collection pipe includes a horizontal straight pipe, a vertical pipe and a short connecting pipe. The horizontal straight pipe is installed on the upper part of the heat sink. One end of the horizontal straight pipe is connected to the short connecting pipe through the vertical pipe. The horizontal straight pipe and the vertical pipe form an "L" shaped structure. The gas collection box is connected to the exhaust port of the horizontal straight pipe. With this upper oil collection pipe design, the structure is simple and compact. Without increasing the height of the transformer tank, the heat dissipation area of ​​the heat sink can be increased, which is conducive to making the lateral dimensions of the radiator more compact.

[0023] (3) The gooseneck radiator of the present invention and the oil-free transformer using the radiator are provided with an upper flange at the pipe opening of the short pipe and a lower flange at the pipe opening of the lower oil collection pipe. The flange structure is used to realize the connection between the radiator and the transformer tank, which is reliable and has good sealing performance.

[0024] (4) The present invention provides a gooseneck radiator and an oil-free transformer using the radiator, wherein the gas collection box is connected to the exhaust port of a horizontal straight pipe through a gas collection pipe, and the gas collection pipe is used to realize the installation of the gas collection box at the exhaust port of the radiator, making the installation of the gas collection box more convenient.

[0025] (5) The present invention provides a gooseneck radiator and an oil-free transformer using the radiator, wherein the oil level gauge is connected to the alarm system and sends an alarm signal when the oil level in the gas collection box drops to the lower limit oil level, so as to facilitate timely feedback of the alarm signal to relevant units, timely maintenance of the transformer, and ensure normal operation of the transformer.

[0026] (6) The present invention provides an oil-free transformer using a gooseneck radiator, wherein a valve is provided between the upper oil collection pipe of the gooseneck radiator and the upper interface of the transformer tank. The valve is closed during the transportation of the transformer to prevent gas from entering the gooseneck radiator due to shaking during transportation. The valve is opened before transportation and operation, which greatly facilitates the on-site installation and operation of the oil-free transformer using the gooseneck radiator. Furthermore, only the valve needs to be set on the upper interface of the transformer tank, which reduces the use of valves and also helps to reduce the manufacturing cost of the transformer.

[0027] (7) An oil-free transformer using a gooseneck radiator according to the present invention has at least one set of heat dissipation fins. When there are two or more sets of heat dissipation fins, each set of heat dissipation fins is arranged side by side. The gas collection box is connected to the exhaust port of each upper oil collection pipe through the gas collection pipe. Multiple sets of heat dissipation fins are used to dissipate heat from the transformer. The number of heat dissipation fins can be flexibly selected according to the size of the transformer to ensure the heat dissipation effect of the transformer. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the installation structure of a traditional plate-type heat sink on an oil-free transformer.

[0029] Figure 2 This is a schematic diagram of the structure of a gooseneck radiator according to the present invention;

[0030] Figure 3 This is a schematic diagram of the main structure of an oil-free transformer using a gooseneck radiator according to the present invention;

[0031] Figure 4 This is a side view of an oil-free transformer using a gooseneck radiator according to the present invention.

[0032] Explanation of the labels in the diagram:

[0033] 1. Transformer oil tank; 1a. Oil level gauge; 2. Plate radiator;

[0034] 100. Gooseneck radiator; 101. Heat sink fins; 102. Upper oil manifold; 102a. Upper flange; 1021. Horizontal straight pipe; 1022. Riser; 1023. Short pipe; 103. Lower oil manifold; 103a. Lower flange; 104. Gas manifold; 105. Gas manifold box; 106. Oil level gauge; 200. Transformer body; 201. Oil tank; 201a. Upper interface; 201b. Lower interface; 300. Valve. Detailed Implementation

[0035] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0036] [Example 1]

[0037] Combination Figure 2 As shown, a gooseneck radiator of this embodiment includes a heat sink 101, an upper oil collecting pipe 102, a lower oil collecting pipe 103, a gas collecting box 105, and an oil level gauge 106. The heat sink 101 is composed of several fins arranged side by side. The upper oil collecting pipe 102 is installed on the upper part of the heat sink 101, and the lower oil collecting pipe 103 is installed on the lower part of the heat sink 101. The oil chamber inside the heat sink 101 is connected to the upper oil collecting pipe 102 and the lower oil collecting pipe 103 respectively. The upper oil collecting pipe 102 is a gooseneck pipe. The gas collecting box 105 is connected to the exhaust port of the upper oil collecting pipe 102. The oil level gauge 106 is installed on the gas collecting box 105 and is used to monitor the oil level in the gas collecting box 105.

[0038] Specifically, in this embodiment, the upper oil collecting pipe 102 includes a horizontal straight pipe 1021, a vertical pipe 1022, and a short connecting pipe 1023. The horizontal straight pipe 1021 is installed on the upper part of the heat sink 101. One end of the horizontal straight pipe 1021 is connected to the short connecting pipe 1023 through the vertical pipe 1022. The short connecting pipe 1023 is arranged parallel to the horizontal straight pipe 1021. The horizontal straight pipe 1021 and the vertical pipe 1022 form an "L" shape. The horizontal straight pipe 1021, the vertical pipe 1022, and the short connecting pipe 1023 are connected in sequence. The short connecting pipe 1023 is used to connect to the transformer tank. The horizontal straight pipe 1021 is located at the highest position of the upper oil collecting pipe 102. The air collecting box 105 is connected to the exhaust port of the horizontal straight pipe 1021. With this upper oil collecting pipe 102 design, the structure is simple and compact. It can increase the heat dissipation area of ​​the heat sink without increasing the height of the transformer tank, which is conducive to making the lateral dimensions of the heat sink more compact.

[0039] To facilitate the connection between the radiator and the transformer tank, an upper flange 102a is provided at the inlet of the short connecting pipe 1023, and a lower flange 103a is provided at the inlet of the lower oil collecting pipe 103. This flange structure ensures a reliable and well-sealed connection between the radiator and the transformer tank. To facilitate the installation of the gas collecting box 105, it is connected to the exhaust port of the horizontal straight pipe 1021 via a gas collecting pipe 104. The gas collecting pipe 104 allows the gas collecting box 105 to be installed at the radiator exhaust port, making installation more convenient.

[0040] In this embodiment, the oil level gauge 106 is communicatively connected to the alarm system. When the oil level in the gas collecting box 105 drops to the lower limit, an alarm signal is issued, facilitating timely feedback of the alarm signal to relevant units for timely transformer maintenance and ensuring normal transformer operation. Before the radiator operates, the gas collecting box 105 is filled with oil. When gas enters the gooseneck radiator, it flows into the gas collecting box 105, causing the oil level to drop. This ensures the gooseneck radiator is filled with transformer oil, and the oil level gauge 106 monitors the oil level in the gas collecting box 105, allowing for timely detection of transformer malfunctions and ensuring normal transformer operation. This innovative design of the gooseneck radiator makes it possible to use it on transformers without an oil conservator. While ensuring the transformer's heat dissipation performance, it also makes the overall transformer size more compact and significantly reduces manufacturing costs compared to transformers with an oil conservator.

[0041] [Example 2]

[0042] like Figure 3 and Figure 4As shown, this embodiment of an oil-free confinement transformer using a gooseneck radiator applies the gooseneck radiator 100 of Embodiment 1 above, specifically including a transformer body 200 and a gooseneck radiator 100. The transformer body 200 is an oil-free confinement transformer, such as an American-style box-type transformer. The transformer body 200 includes an oil tank 201 and components such as transformer core coil windings disposed within the oil tank 201. The specific structure and working principle of the transformer body 200 are similar to those of the prior art and will not be described in detail here. The upper part of one side wall of the oil tank 201 of the transformer body 200 is provided with an upper interface 201a and the lower part with a lower interface 201b. The oil tank 201 is filled with transformer oil, and a certain air gap is left at the top of the oil tank 201. The upper oil collecting pipe 102 of the gooseneck radiator 100 is connected to the upper interface 201a of the oil tank 201, and the lower oil collecting pipe 103 of the gooseneck radiator 100 is connected to the lower interface 201b of the oil tank 201, so that the transformer oil in the gooseneck radiator 100 is connected to the transformer oil in the oil tank 201. The heat dissipation fins 101 of the gooseneck radiator 100 dissipate heat from the transformer oil, reducing the operating temperature of the transformer. When gas enters the gooseneck radiator 100 from the transformer's oil tank 201, the gas rises and enters the gas collecting box 105. At this time, the oil level in the gas collecting box 105 will drop, so that there is no gas in the heat dissipation fins 101. When the oil level in the gas collecting box 105 drops to the lower limit level, the oil level gauge 106 can provide an oil level alarm output signal, which facilitates timely detection of transformer operating abnormalities and ensures normal operation of the transformer.

[0043] In addition, Figure 3 As shown, in this embodiment, a valve 300 is also provided between the upper oil collecting pipe 102 and the upper interface 201a. The valve 300 is used to control the oil passage between the upper oil collecting pipe 102 and the upper interface 201a. The valve is closed during transformer transportation to prevent gas from entering the gooseneck radiator due to shaking during transport. The valve is opened before the transformer is placed in place and put into operation, greatly facilitating the on-site installation and operation of oil-free transformers using gooseneck radiators. Furthermore, since only the valve 300 needs to be installed on the upper interface of the transformer tank, the number of valves used is reduced, which also helps to lower the manufacturing cost of the transformer.

[0044] Specifically, in this embodiment, the liquid level in the oil tank 201 of the transformer body 200 is lower than the top height of the upper oil collection pipe 102 of the gooseneck radiator 100, giving full play to the structural advantages of the gooseneck radiator 100, which not only ensures the heat dissipation performance of the transformer, but also makes the overall size of the transformer more compact.

[0045] Furthermore, such as Figure 4As shown, the gooseneck radiator 100 has at least one set of heat dissipation fins 101. When there are two or more sets of heat dissipation fins 101, the sets of heat dissipation fins 101 are arranged side by side. The top of each set of heat dissipation fins 101 is connected to the upper part of the oil tank 201 of the transformer body 200 through the upper oil collecting pipe 102, and the bottom of each set of heat dissipation fins 101 is connected to the lower part of the oil tank 201 of the transformer body 200 through the lower oil collecting pipe 103. The vent box 105 is connected to the vent of each upper oil collecting pipe 102 through the vent collecting pipe 104. Using multiple sets of heat dissipation fins to cool the transformer allows for flexible selection of the number of heat dissipation fin sets according to the size of the transformer, ensuring the heat dissipation effect of the transformer.

[0046] It should be noted that after the gas collecting box 105 is connected to the exhaust port of the upper oil collecting pipe 102 through the gas collecting pipe 104, it forms a closed space isolated from the atmosphere with the gooseneck radiator. That is, the gas collecting box 105 is a closed box structure, which provides a collection space for the gas mixed in inside the radiator and plays a protective role in the normal operation of the transformer.

[0047] This invention discloses a gooseneck radiator and an oil-free transformer using the radiator. A gas collection box is installed at the exhaust port of the upper oil collection pipe of the gooseneck radiator, and an oil level gauge is installed on the gas collection box. Before the radiator operates, the gas collection box is filled with oil. When gas enters the gooseneck radiator, the gas enters the gas collection box, causing the oil level in the gas collection box to drop, ensuring that the gooseneck radiator is filled with transformer oil. The oil level gauge monitors the oil level in the gas collection box, facilitating timely detection of transformer malfunctions and ensuring normal transformer operation. This innovative design of the gooseneck radiator makes it possible to use it on oil-free transformers, ensuring the transformer's heat dissipation performance while making the overall transformer size more compact, and significantly reducing manufacturing costs compared to transformers with oil conservators. In addition, by installing a valve between the upper oil collection pipe of the gooseneck radiator and the upper interface of the transformer tank, the valve can be closed during transformer transportation to prevent gas from entering the gooseneck radiator due to shaking during transportation. The valve can be opened before transportation and operation, which greatly facilitates the on-site installation and operation of oil-free transformers using gooseneck radiators. Moreover, only the valve needs to be installed on the upper interface of the transformer tank, which reduces the use of valves and also helps to reduce the manufacturing cost of the transformer.

[0048] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An oil-free confined transformer using a gooseneck radiator, comprising a transformer body (200), wherein the transformer body (200) is an oil-free confined transformer, wherein the upper part of one side wall of the oil tank (201) of the transformer body (200) is provided with an upper interface (201a) and the lower part with a lower interface (201b), the oil tank (201) is filled with transformer oil, and a certain air gap is left at the top of the oil tank (201); characterized in that: It also includes a gooseneck radiator (100), which includes a heat sink (101), an upper oil collection pipe (102), a lower oil collection pipe (103), a gas collection box (105), and an oil level gauge (106). The upper oil collection pipe (102) is installed on the upper part of the heat sink (101), and the lower oil collection pipe (103) is installed on the lower part of the heat sink (101). The upper oil collection pipe (102) is a gooseneck pipe, including a horizontal straight pipe (1021), a riser pipe (1022), and a short pipe (1023). The horizontal straight pipe (1021) is installed on the upper part of the heat sink (101), and the horizontal straight pipe (1021) is installed on the lower part of the heat sink (1023). One end of the radiator is connected to the short pipe (1023) via the riser (1022). The horizontal straight pipe (1021) and the riser (1022) form an "L" shape. The gas collection box (105) is connected to the exhaust port of the horizontal straight pipe (1021). The gas collection box (105) is a closed box structure, providing a collection space for the gas mixed in the radiator. The oil level gauge (106) is installed on the gas collection box (105) to monitor the oil level in the gas collection box (105). The oil level gauge (106) is connected to the alarm system and issues an alarm signal when the oil level in the gas collection box (105) drops to the lower limit oil level. The upper oil collection pipe (102) of the gooseneck radiator (100) is connected to the upper interface (201a) of the oil tank (201), and the lower oil collection pipe (103) of the gooseneck radiator (100) is connected to the lower interface (201b) of the oil tank (201). The liquid level in the oil tank (201) of the transformer body (200) is lower than the top height of the upper oil collection pipe (102) of the gooseneck radiator (100). When gas enters the gooseneck radiator (100) from the oil tank (201) of the transformer, the gas rises into the gas collection box (105). At this time, the oil level in the gas collection box (105) will drop, so that there is no gas in the radiator (101). When the oil level in the gas collection box (105) drops to the lower limit liquid level, the oil level gauge (106) can provide an oil level alarm output signal.

2. The oil-free transformer using a gooseneck radiator according to claim 1, characterized in that: The short connecting pipe (1023) is provided with an upper flange (102a) at the pipe opening, and the lower oil gathering pipe (103) is provided with a lower flange (103a) at the pipe opening.

3. The oil-free transformer using a gooseneck radiator according to claim 2, characterized in that: The gas collection box (105) is connected to the exhaust port of the horizontal straight pipe (1021) through the gas collection pipe (104).

4. The oil-free transformer using a gooseneck radiator according to claim 1, characterized in that: A valve (300) is also provided between the upper oil collection pipe (102) and the upper interface (201a).

5. An oil-free transformer using a gooseneck radiator according to any one of claims 1 to 4, characterized in that: The gooseneck radiator (100) has at least one set of heat sinks (101). When there are two or more sets of heat sinks (101), each set of heat sinks (101) is arranged side by side. The top of each set of heat sinks (101) is connected to the upper part of the oil tank (201) of the transformer body (200) through the upper oil collecting pipe (102). The bottom of each set of heat sinks (101) is connected to the lower part of the oil tank (201) of the transformer body (200) through the lower oil collecting pipe (103). The gas collecting box (105) is connected to the exhaust port of each upper oil collecting pipe (102) through the gas collecting pipe (104).

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