A circulating rectification purifying device for transformer insulating oil

Abstract

The utility model is suitable for insulating oil purification technical field provides a kind of transformer insulating oil circulating rectification purification device, including rectifying column and be used for preheating insulating oil's preheater and the buffer tank of storing insulating oil being located the both sides of rectifying column;Be used for conveying insulating oil between the preheater and buffer tank and be arranged several conveying pumps, and the both ends of several conveying pumps are connected with the connecting pipe of rectifying column, preheater and buffer tank respectively;Be used for circulating purification insulating oil and be arranged on the one side of buffer tank circulating pump, and the both ends of circulating pump are connected with buffer tank and preheater respectively;Be used for the heat absorption pipe of condensing steam and be arranged on the back of rectifying column.The transformer insulating oil circulating rectification purification device provided in the scheme can solve the problem that the steam condensing effect is poor due to insufficient heat exchange area of traditional overhead integrated condenser, and has the advantage of effectively improving the steam condensing effect.

Description

Technical Field

[0001] This utility model belongs to the field of insulating oil purification technology, and in particular relates to a circulating distillation purification device for transformer insulating oil. Background Technology

[0002] The insulating oil purification device is mainly used to efficiently remove moisture, gas and low-boiling-point aging products from the oil, thereby improving its insulation performance and chemical stability.

[0003] Currently, transformer insulating oil distillation and purification equipment generally adopts the design of an integrated condenser at the top of the distillation column. The steam is directly condensed at the top of the distillation column and then refluxed or discharged. Although this method has a compact structure, the heat exchange area of ​​the condenser at the top of the column is insufficient due to the diameter of the distillation column. This results in poor steam condensation effect during high-load operation, which in turn leads to some steam escaping and affects the vacuum level. Utility Model Content

[0004] This invention provides a circulating distillation purification device for transformer insulating oil, aiming to solve the problem mentioned in the background art of insufficient heat exchange area in currently used distillation purification devices, which leads to poor steam condensation effect.

[0005] To solve the above problems, this utility model is implemented as follows: a transformer insulating oil circulating distillation purification device includes a distillation column and a preheater for preheating the insulating oil and a buffer tank for storing the insulating oil, located on both sides of the distillation column; a plurality of transfer pumps for conveying the insulating oil located between the preheater and the buffer tank, with both ends of the transfer pumps connected to connecting pipes of the distillation column, the preheater, and the buffer tank respectively; a circulating pump located on one side of the buffer tank for circulating and purifying the insulating oil, with both ends of the circulating pump connected to the buffer tank and the preheater respectively; a heat absorption tube located on the back of the distillation column for condensing vapor; a spiral tube wound around the heat absorption tube, one end of the spiral tube being fixedly connected to the top of the distillation column; and a water supply mechanism located on one side of the distillation column for supplying cold water to the heat absorption tube.

[0006] Preferably, the water supply mechanism includes: a collection tank located on one side of the distillation column for collecting wastewater, the collection tank being fixedly connected to the heat absorption tube and the spiral tube; a cooling plate located on one side of the collection tank for cooling the water; and a water pump fixedly installed on the top of the collection tank for supplying cold water to the heat absorption tube, a drain pipe being fixedly installed on the drain end of the water pump, the drain pipe being fixedly connected to the heat absorption tube.

[0007] Preferably, multiple baffles are fixedly installed inside the heat absorption tube, and the multiple baffles separate the heat absorption tube to form a serpentine cavity. The top of the buffer tank is equipped with a detection device for monitoring the moisture, acid value and dielectric strength of the insulating oil.

[0008] Preferably, fins are fixedly installed on both sides of the cooling plate, the fins located in the collection tank extend into the water body, an installation cover is fixedly installed on the outer shell of the cooling plate, the installation cover covers the fin located on the left side, and a cooling fan for fin heat dissipation is fixedly installed inside the installation cover.

[0009] Preferably, the collection tank is equipped with an insulation layer for keeping the water body warm, and a pumping pipe is fixedly installed on the pumping end of the water pump. A filter box for preventing impurities from entering the water pump is installed on the pumping pipe.

[0010] Preferably, the collection tank is provided with a cleaning mechanism for cleaning impurities on the outer wall of the filter box. The cleaning mechanism includes: a connecting box installed on one side of the inner wall of the collection tank; a one-way screw rotatably installed at the bottom of the connecting box; a scraper threaded onto the one-way screw for scraping impurities on the filter box, the scraper being arranged in a ring and fitted onto the filter box; and a motor fixedly installed on one side of the filter box, the output shaft of the motor and the one-way screw both being fixedly fitted with bevel gears, the two bevel gears meshing with each other.

[0011] Preferably, a protective cover for protecting the motor is fixedly installed on one side of the collection tank, a drain pipe is fixedly installed on one side of the collection tank, a valve is installed on the drain pipe, and a guide rod for guiding the scraper is fixedly installed inside the collection tank, the guide rod being slidably connected to the scraper.

[0012] Preferably, the collection tank is provided with an automatic opening and closing mechanism for automatically opening and closing valves. The automatic opening and closing mechanism includes: a round rod fixedly installed on the top of the inner wall of the collection tank; a float plate slidably sleeved on the round rod; a set of contact rods respectively installed on the upper and lower sides of the float plate; an L-shaped plate fixedly installed on the bottom end of the round rod; and a set of switch bodies respectively installed on the L-shaped plate and the top of the inner wall of the collection tank for opening and closing valves, wherein the set of switch bodies is adapted to the set of contact rods.

[0013] Compared with related technologies, the transformer insulating oil circulating distillation purification device provided by this utility model has the following beneficial effects:

[0014] Compared with existing technologies, the transformer insulating oil circulating distillation purification device provided in this solution solves the problem of poor steam condensation effect caused by insufficient heat exchange area in traditional tower-top integrated condensers by setting up heat absorption tubes and spiral tubes. It utilizes the cold air dissipated by the cold water in the heat absorption tubes to condense the steam in the spiral tubes, thereby improving the steam condensation effect. Since the steam can be fully condensed, some steam escape is avoided, thus ensuring the vacuum degree in the distillation process and facilitating the stable operation of the distillation process. By using a circulating pump to circulate the insulating oil between the buffer tank, preheater, and distillation tower, the insulating oil can be purified multiple times, improving the purification effect and better enhancing its insulation performance and chemical stability.

[0015] In summary, the transformer insulating oil circulating distillation purification device of this invention can solve the problem of poor steam condensation effect caused by insufficient heat exchange area in traditional tower top integrated condensers, and has the advantage of effectively improving the steam condensation effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a circulating distillation and purification device for transformer insulating oil provided by this utility model;

[0017] Figure 2 This is a rear view structural schematic diagram of the distillation column provided by this utility model;

[0018] Figure 3 This is a rear cross-sectional view of the collection tank and heat absorption tube provided by this utility model;

[0019] Figure 4 for Figure 3 An enlarged structural diagram of part A shown in the figure;

[0020] Figure 5 for Figure 3 The diagram shows an enlarged view of part B.

[0021] Reference numerals: 1. Distillation column; 2. Preheater; 3. Buffer tank; 4. Transfer pump; 5. Circulation pump; 6. Heat absorption tube; 7. Spiral tube; 8. Detection equipment; 9. Collection tank; 10. Cooling element; 11. Water pump; 12. Drain pipe; 13. Baffle plate; 14. Fin; 15. Mounting cover; 16. Cooling fan; 17. Insulation layer; 18. Pumping pipe; 19. Filter box; 20. Connection box; 21. One-way screw; 22. Scraper; 23. Motor; 24. Bevel gear; 25. Protective cover; 26. Round rod; 27. Float plate; 28. Contact rod; 29. ​​L-shaped plate; 30. Switch body; 31. Guide rod. Detailed Implementation

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order; the terms "inner," "outer," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] This utility model embodiment provides a transformer insulating oil circulating distillation purification device, such as... Figure 1-5 As shown, the transformer insulating oil circulating distillation purification device includes: a distillation column 1 and a preheater 2 for preheating the insulating oil and a buffer tank 3 for storing the insulating oil, located on both sides of the distillation column 1; a plurality of transfer pumps 4 for conveying the insulating oil, located between the preheater 2 and the buffer tank 3, with both ends of the plurality of transfer pumps 4 connected to the connecting pipes of the distillation column 1, the preheater 2 and the buffer tank 3 respectively; a circulating pump 5 for circulating purification of the insulating oil, located on one side of the buffer tank 3, with both ends of the circulating pump 5 connected to the buffer tank 3 and the preheater 2 respectively; a heat absorption pipe 6 located on the back of the distillation column 1 for condensing vapor; a spiral tube 7 wound around the heat absorption pipe 6, with one end of the spiral tube 7 fixedly connected to the top of the distillation column 1; and a water supply mechanism located on one side of the distillation column 1 for supplying cold water to the heat absorption pipe 6.

[0025] In this embodiment, insulating oil starts from buffer tank 3, is pumped by circulating pump 5 to preheater 2, then enters distillation column 1 for distillation and purification, and finally returns to buffer tank 3, completing one cycle. A water supply mechanism provides cold water to heat-absorbing pipe 6. Spiral tube 7 is wound around heat-absorbing pipe 6, carrying steam. The steam absorbs the cold air dissipated from heat-absorbing pipe 6, thus achieving condensation. The condensate falls under gravity, preventing steam backflow. By setting up heat-absorbing pipe 6 and spiral tube 7, the cold air dissipated by the cold water in heat-absorbing pipe 6 is used to condense the oil. The steam in the swirl tube 7 is condensed, which solves the problem of poor steam condensation effect caused by insufficient heat exchange area in traditional integrated condensers at the top of the tower. This improves the steam condensation effect. Since the steam can be fully condensed, some steam escape is avoided, thus ensuring the vacuum degree in the distillation process and facilitating the stable operation of the distillation process. By using the circulating pump 5 to circulate the insulating oil between the buffer tank 3, the preheater 2 and the distillation tower 1, the insulating oil is purified multiple times, improving the purification effect of the insulating oil and better enhancing its insulation performance and chemical stability.

[0026] In a further preferred embodiment of the present invention, the water supply mechanism includes: a collection tank 9 disposed on one side of the distillation column 1 for collecting wastewater, the collection tank 9 being fixedly connected to the heat absorption pipe 6 and the spiral pipe 7; a cooling plate 10 disposed on one side of the collection tank 9 for cooling the water; and a water pump 11 fixedly installed on the top of the collection tank 9 for supplying cold water to the heat absorption pipe 6, a drain pipe 12 being fixedly installed on the drain end of the water pump 11, and the drain pipe 12 being fixedly connected to the heat absorption pipe 6.

[0027] In this embodiment, the water pump 11 delivers chilled water to the heat absorption tube 6 through the drain pipe 12. The chilled water flows in the heat absorption tube 6, providing cooling for the steam in the spiral tube 7, causing the steam to condense. The condensed wastewater flows into the collection tank 9 for collection. The wastewater in the collection tank 9 is cooled by the cooling plate 10, and the water pump 11 delivers the cooled wastewater to the heat absorption tube 6 as a cold source, realizing the recycling of wastewater. This not only reduces water waste and lowers the operating cost of the device, but also conforms to the concept of environmental protection. By using the cooling plate 10 to cool the wastewater, the temperature of the chilled water can be controlled relatively stably, providing a reliable cold source for the heat absorption tube 6, thereby ensuring the condensation effect of the steam in the spiral tube 7, and thus maintaining the stability and purification effect of the distillation process.

[0028] In a further preferred embodiment of this utility model, a plurality of partitions 13 are fixedly installed inside the heat absorption tube 6, and the plurality of partitions 13 separate the heat absorption tube 6 to form a serpentine cavity. A detection device 8 for monitoring the moisture, acid value, dielectric strength, etc. in the insulating oil is installed on the top of the buffer tank 3.

[0029] In this embodiment, when the water supply mechanism provides cold water to the heat absorption pipe 6, the cold water flows in the serpentine cavity. Due to the obstruction and guidance of the baffle 13, the flow path of the cold water becomes longer and the flow speed is relatively slowed down. A detection device 8 is installed on the top of the buffer tank 3. This detection device 8 is an oil analyzer and a dielectric strength tester used to monitor parameters such as moisture, acid value, and dielectric strength in the insulating oil. During the insulating oil circulation and purification process, the insulating oil flows out of the buffer tank 3, is processed, and then returns to the preheater 2 for circulation and purification. In addition, when it is necessary to discharge the purified insulating oil, the three-way valve on one side of the buffer tank 3 is adjusted to close the connection with the circulation pump 5 and open the drain pipe on the other end. The oil is then discharged through the drain pipe. The detection device 8 can detect the insulating oil in the buffer tank 3 in real time so as to understand the purification effect and quality status of the insulating oil in a timely manner.

[0030] In a further preferred embodiment of the present invention, fins 14 are fixedly installed on both sides of the cooling chip 10. The fins 14 located in the collection tank 9 extend into the water body. An installation cover 15 is fixedly installed on the outer shell of the cooling chip 10. The installation cover 15 covers the fin 14 located on the left side, and a cooling fan 16 for heat dissipation of the fins 14 is fixedly installed inside the installation cover 15.

[0031] In this embodiment, the fins 14 on the cooling end face of the refrigeration element 10 are inserted into the water, increasing the contact area between the cooling end and the water. This allows for faster and more efficient transfer of cooling capacity to the water, improving the water's cooling efficiency. Consequently, it provides the heat absorption tube 6 with cooler water, enhancing steam condensation and ensuring the vacuum level within the distillation column. The fins 14 on the heat dissipation end face of the refrigeration element 10, located outside the collection tank 9, work in conjunction with the cooling fan 16 to effectively dissipate the heat generated by the refrigeration element 10, preventing damage due to overheating. This ensures the refrigeration element 10 operates stably and continuously at a suitable temperature, extending its service life and improving the reliability of the device. The cooperation between the fins 14 on both sides and the refrigeration element 10, along with the auxiliary cooling from the cooling fan 16, forms a complete refrigeration and heat dissipation system. This system can quickly and efficiently achieve a balance between cooling and heat dissipation.

[0032] In a further preferred embodiment of the present invention, an insulation layer 17 for heat preservation of water is installed inside the collection tank 9, and a water pump pipe 18 is fixedly installed on the water pump 11. A filter box 19 for preventing impurities from entering the water pump 11 is installed on the water pump pipe 18.

[0033] In this embodiment, a filter box 19 is installed on the water pump 18. When the water pump 11 is working, the water in the collection tank 9 first passes through the filter box 19. The filter box 19 intercepts and filters impurities in the water to prevent impurities from entering the water pump 11 with the water flow. Then, the water pump 11 transports the filtered cold water through the drain pipe 12 to the heat absorption pipe 6 to provide a cold source for steam condensation. The heat exchange between the water in the collection tank 9 and the external environment is significantly reduced by the setting of the insulation layer 17, which reduces the rate of heat loss and allows the cold water cooled by the cooling plate 10 to maintain a low temperature for a long time.

[0034] In a further preferred embodiment of this utility model, the collection tank 9 is provided with a cleaning mechanism for cleaning impurities on the outer wall of the filter box 19. The cleaning mechanism includes: a connecting box 20 installed on one side of the inner wall of the collection tank 9; a one-way screw 21 rotatably installed at the bottom of the connecting box 20; a scraper 22 threaded on the one-way screw 21 for scraping off impurities on the filter box 19, the scraper 22 being annularly arranged and fitted on the filter box 19; and a motor 23 fixedly installed on one side of the filter box 19, wherein bevel gears 24 are fixedly fitted on both the output shaft of the motor 23 and the one-way screw 21, and the two bevel gears 24 mesh with each other.

[0035] In this embodiment, when the one-way screw 21 rotates, according to the principle of screw transmission, the scraper 22 will move along the axial direction of the one-way screw 21. During the movement, the scraper 22 will be in close contact with the outer wall of the filter box 19, thereby scraping off the impurities accumulated on the outer wall of the filter box 19 and cleaning the filter box 19. During the long-term operation of the device, impurities will gradually accumulate on the outer wall of the filter box 19. These impurities will block the filter holes of the filter box 19, reduce the filtration effect, and may even cause the water pump 11 to fail to work properly due to poor water pumping. The cleaning mechanism can clean the impurities on the outer wall of the filter box 19 in a timely manner, ensuring that the filter box 19 always has good filtration performance, ensuring that the water pump 11 can stably pump cold water and maintain the normal operation of the device.

[0036] In a further preferred embodiment of the present invention, a protective cover 25 for protecting the motor 23 is fixedly installed on one side of the collection tank 9, a drain pipe is fixedly installed on one side of the collection tank 9, a valve is installed on the drain pipe, and a guide rod 31 for guiding the scraper 22 is fixedly installed inside the collection tank 9, and the guide rod 31 is slidably connected to the scraper 22.

[0037] In this embodiment, when the motor 23 drives the one-way screw 21 to rotate through the bevel gear 24, thereby causing the scraper 22 to move axially along the one-way screw 21 to clean impurities, the guide rod 31 provides guidance for the movement of the scraper 22. Under the combined action of the one-way screw 21 and the guide rod 31, the scraper 22 can only move along a predetermined straight line, avoiding deviation or shaking of the scraper 22 during movement, and ensuring that the scraper 22 can stably and accurately scrape the impurities on the outer wall of the filter box 19.

[0038] In a further preferred embodiment of this utility model, the collection tank 9 is provided with an automatic opening and closing mechanism for automatically opening and closing valves. The automatic opening and closing mechanism includes: a round rod 26 fixedly installed on the top of the inner wall of the collection tank 9; a float plate 27 slidably sleeved on the round rod 26; a set of contact rods 28 respectively installed on the upper and lower sides of the float plate 27; an L-shaped plate 29 fixedly installed on the bottom end of the round rod 26; and a set of switch bodies 30 respectively installed on the L-shaped plate 29 and the top of the inner wall of the collection tank 9 for opening and closing valves. The set of switch bodies 30 is adapted to the set of contact rods 28.

[0039] In this embodiment, since the bottom end of the round rod 26 is located above the fin 14, when the valve is opened to drain water, the float 27 also descends as the water level drops. When the contact rod 28 on the lower side of the float 27 contacts the switch body 30 on the L-shaped plate 29, the valve closes. At this time, the collection tank 9 always stores one-third of the wastewater, ensuring that there is enough water in the collection tank 9 for subsequent supply of cold water to the heat absorption pipe 6, maintaining the normal operation of the device.

[0040] In summary, compared with related technologies, this device can solve the problem of poor steam condensation effect caused by insufficient heat exchange area in traditional tower top integrated condensers, and effectively improves the steam condensation effect.

[0041] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A circulating distillation purification device for transformer insulating oil, characterized in that, include: Distillation column (1) and preheater (2) for preheating insulating oil and buffer tank (3) for storing insulating oil located on both sides of the distillation column (1); A plurality of delivery pumps (4) are provided between the preheater (2) and the buffer tank (3) for conveying insulating oil, and the plurality of delivery pumps (4) are connected to the connecting pipes of the distillation column (1), the preheater (2) and the buffer tank (3); A circulating pump (5) is installed on one side of the buffer tank (3) for circulating and purifying insulating oil. The two ends of the circulating pump (5) are connected to the buffer tank (3) and the preheater (2) respectively. A heat absorption tube (6) is installed on the back side of the distillation column (1) for condensing steam. A spiral tube (7) is wound around the heat absorption tube (6), and one end of the spiral tube (7) is fixedly connected to the top of the distillation column (1); A water supply mechanism is provided on one side of the distillation column (1) for supplying cold water to the heat absorption tube (6).

2. The transformer insulating oil circulating distillation purification device as described in claim 1, characterized in that, The water supply system includes: A collection tank (9) for collecting wastewater is provided on one side of the distillation column (1), and the collection tank (9) is fixedly connected to the heat absorption tube (6) and the spiral tube (7); A cooling plate (10) for cooling water is provided on one side of the collection tank (9); A water pump (11) is fixedly installed on the top of the collection tank (9) to supply cold water to the heat absorption pipe (6). A drain pipe (12) is fixedly installed on the drain end of the water pump (11), and the drain pipe (12) is fixedly connected to the heat absorption pipe (6).

3. The transformer insulating oil circulating distillation purification device as described in claim 1, characterized in that, Multiple baffles (13) are fixedly installed inside the heat absorption tube (6). The multiple baffles (13) separate the heat absorption tube (6) to form a serpentine cavity. A detection device (8) for monitoring the moisture, acid value and dielectric strength in the insulating oil is installed on the top of the buffer tank (3).

4. The transformer insulating oil circulating distillation purification device as described in claim 2, characterized in that, Fins (14) are fixedly installed on both sides of the cooling plate (10). The fins (14) located in the collection tank (9) extend into the water. An installation cover (15) is fixedly installed on the outer shell of the cooling plate (10). The installation cover (15) covers the fin (14) located on the left side, and a cooling fan (16) for heat dissipation of the fins (14) is fixedly installed inside the installation cover (15).

5. The transformer insulating oil circulating distillation and purification device as described in claim 2, characterized in that, The collection tank (9) is equipped with an insulation layer (17) for keeping the water body warm. A water pump (11) is fixedly installed on the pumping end. A filter box (19) is installed on the water pump (11) to prevent impurities from entering the pump (11).

6. The transformer insulating oil circulating distillation and purification device as described in claim 2, characterized in that, The collection tank (9) is equipped with a cleaning mechanism for cleaning impurities on the outer wall of the filter box (19), the cleaning mechanism comprising: A connecting box (20) is installed on one side of the inner wall of the collection tank (9); Rotate the one-way screw (21) installed at the bottom of the connecting box (20); A scraper (22) threaded onto the one-way screw (21) is used to scrape off impurities on the filter box (19). The scraper (22) is arranged in a ring and is fitted onto the filter box (19). A motor (23) is fixedly installed on one side of the filter box (19). Both the output shaft of the motor (23) and the one-way screw (21) are fitted with bevel gears (24), and the two bevel gears (24) mesh with each other.

7. The transformer insulating oil circulating distillation and purification device as described in claim 6, characterized in that, A protective cover (25) for protecting the motor (23) is fixedly installed on one side of the collection tank (9). A sewage pipe is fixedly installed on one side of the collection tank (9). A valve is installed on the sewage pipe. A guide rod (31) for guiding the scraper (22) is fixedly installed inside the collection tank (9). The guide rod (31) is slidably connected to the scraper (22).

8. The transformer insulating oil circulating distillation and purification device as described in claim 7, characterized in that, The collection tank (9) is equipped with an automatic opening and closing mechanism for automatically opening and closing valves, the automatic opening and closing mechanism comprising: A round rod (26) is fixedly installed on the top of the inner wall of the collection tank (9); A floating plate (27) is slidably sleeved on the round rod (26); A set of contact rods (28) are respectively installed on the upper and lower sides of the float (27); An L-shaped plate (29) is fixedly installed at the bottom end of the round rod (26); A set of switch bodies (30) are respectively installed on the top of the inner wall of the L-shaped plate (29) and the collection tank (9) for opening and closing the valves. The set of switch bodies (30) is adapted to the set of contact rods (28).

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