A molecular distillation device for diglyceride edible oil with rapid cooling

Abstract

The present invention relates to the field of distillation technology, and discloses a molecular distillation device for diglyceride edible oil that can be quickly cooled. The device comprises a tank body, wherein a semiconductor mounting seat is provided in the middle of the tank body, and a light component condensation collection area and a heavy component condensation collection area are provided above and below the semiconductor mounting seat, respectively, wherein a secondary condensation interval is provided outside the heavy component condensation collection area, and a semiconductor refrigeration module is provided inside the semiconductor mounting seat. The cold end of the semiconductor refrigeration module is used for condensing the light component condensation collection area, and the secondary condensation interval is connected to the light component condensation collection area. The oil condensed in the light component condensation collection area flows into the secondary condensation interval, which is used to condense the vapor in the heavy component condensation collection area. The device separates the light component condensation area from the heavy component condensation area. The light component condensation area is at the top of the evaporation tower, and the heavy component cannot rise to the light component condensation area, thereby ensuring the purity of the light component condensed oil.

Description

Technical Field

[0001] The invention relates to the technical field of distillation, in particular to a molecular distillation device for diglyceride edible oil capable of rapid cooling. Background Art

[0002] By using high temperature and low pressure conditions to heat the crude oil, the volatile components in the oil are evaporated and separated, achieving the effects of removing free fatty acids, cholesterol and deodorizing.

[0003] Chinese patent CN112704893B discloses a molecular distillation device with a scraper, comprising a motor, a distillation cylinder, a heating jacket provided on the outside of the distillation cylinder, and a vacuum tube connected to the bottom of the distillation cylinder. The device is characterized in that: a distribution disc, a scraping mechanism, and a condensing mechanism driven by a motor are provided inside the distillation cylinder from top to bottom, multiple groups of scraping mechanisms are evenly distributed along the motor shaft, a feed pipe is provided above the distribution disc, and the bottom of the distillation cylinder is connected to a heavy component collection chamber and a heavy component outlet pipe. The present invention utilizes the gravity of the condenser itself and an elastic pull rope to rotate the lever and the transmission rod along the rotating shaft and toggle the slider so that the scraper is fully fitted with the inner wall of the distillation cylinder. When the scraping mechanism is not coaxial with the distillation cylinder, the gravity of the condenser itself and the elastic force of the elastic pull rope ensure that the scraper is always fully fitted with the inner wall of the distillation cylinder, so that the liquid film is pulled into a uniform liquid film, thereby significantly improving the distillation efficiency.

[0004] In the aforementioned patent, after the crude oil is heated to a gaseous state through evaporation, the gaseous evaporation is cooled for condensation and collection. Other distillation equipment, including the aforementioned patent, generally achieves the deodorization of the edible oil by placing a condensation column at the center of the distillation tower to condense and collect the evaporation. The condensate on the condensation column is collected by a rotating scraper. The columnar condensation structure causes both the light and heavy components after heating to condense on the condensation column. The light and heavy components condense in the upper and lower areas of the condensation column, respectively. The condensate in these two areas is collected and separated.

[0005] However, at the intersection of the upper and lower areas, there is an intersection area where light and heavy components condense. The condensate collected in this area is still in a mixed state and needs to be distilled again, which cannot achieve the effect of rapid cooling, separation and condensation. For this reason, a diglyceride edible oil molecular distillation equipment with rapid cooling is proposed. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a diglyceride edible oil molecular distillation device capable of rapid cooling, which has advantages and solves the problems.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a molecular distillation device for diglyceride edible oil that can be cooled quickly, comprising a tank body, a semiconductor mounting seat is provided in the middle of the tank body, a light component condensation collection area and a heavy component condensation collection area are provided above and below the semiconductor mounting seat, respectively, wherein a secondary condensation interval is provided outside the heavy component condensation collection area, an evaporation plate is provided at the bottom end of the inner part of the tank body, a semiconductor refrigeration module is provided in the semiconductor mounting seat, and a feeding pipe for feeding is connected to the semiconductor mounting seat, the crude oil transported in the feeding pipe is connected to the hot end of the semiconductor refrigeration module, the cold end of the semiconductor refrigeration module is used for condensation in the light component condensation collection area, the secondary condensation interval is connected to the light component condensation collection area, the oil condensed in the light component condensation collection area is merged into the secondary condensation interval, and is used for cooling the heavy component condensation collection area. The steam in the component condensation collection area is condensed, and the device completely separates the light component condensation area from the heavy component condensation area. The light component condensation area is arranged at the inner top of the evaporation tower. The heavy component cannot rise to the light component condensation area, so that the impurity content of the oil condensed by the light component is further reduced, thereby ensuring the purity of the light component condensed oil. In addition, the condensation of the light component is achieved through a semiconductor refrigeration module. The refrigerant of the semiconductor refrigeration module acts on the light component, and its hot end is connected to the feed pipe. While the crude oil takes away the heat from the hot end of the semiconductor refrigeration module, the initial heating of the crude oil is completed during the feeding process, so as to reduce the energy consumption of the distillation device for evaporating the crude oil. In addition, the oil condensed by the semiconductor refrigeration module is connected to the heavy component condensation area to condense the heavy component, so as to increase energy utilization efficiency, improve the condensation effect, and reduce energy consumption requirements.

[0008] Preferably, the light component condensation collection area includes a transmission structure, a condensation component and a collection component. A refrigerant pipeline is provided in the condensation component, and the refrigerant pipeline is connected to the cold end of the semiconductor refrigeration module. The condensate on the condensation component is collected by the collection component and then merged into the secondary condensation interval. The refrigerant of the semiconductor refrigeration module is conducted to the condensation component to condense the gaseous light component here. The condensed oil body is still in a low-temperature state. After being merged into the secondary condensation interval, the condensed oil body at a low temperature has a large temperature difference with the temperature inside the tank body, so it is used as a refrigerant in the heavy component condensation interval.

[0009] Preferably, the transmission structure includes a driving motor, a connecting disk and a twisted shaft. The driving motor drives the twisted shaft to rotate. The connecting disk is mounted on the twisted shaft. Two positioning rods are provided on the semiconductor mounting seat and pass through the connecting disk. The rotation of the twisted shaft can drive the connecting disk to reciprocate up and down.

[0010] Preferably, the condensing assembly includes a main sliding part, a positioning device fixing rod and a condensing knife, wherein the refrigerant pipeline is connected to the sliding part and contacts the condensing knife, the fixing rod is fixedly installed on the inner wall of the tank body and inserted into the sliding part, and the sliding part can slide along the fixing rod. After the refrigerant pipeline is included in the sliding part and contacts the condensing knife, the temperature of the condensing knife head is reduced, and the light components can be condensed at its cutting edge.

[0011] Preferably, a connecting rod is provided between the sliding member and the connecting disk, and the connecting rod is rotatably connected to the sliding member and the connecting disk. The twisted shaft rotates to drive the connecting disk to move up and down, so as to push the sliding member to move through the connecting rod. Due to the limitation of the fixed rod, the sliding member reciprocates back and forth along the route of the fixed rod.

[0012] Preferably, the collecting assembly includes two attached plates installed on the inner wall of the tank body, a partition is connected between the two attached plates, and the oil transfer channel is formed in conjunction with the inner wall of the tank body, and a drainage scraper is connected in the middle of the two attached plates. The drainage scraper extends upward to contact the condensation knife, and a groove adapted to the edge of the condensation knife is provided on the drainage scraper. The sliding part that reciprocates back and forth drives the condensation knife to reciprocate, and the oil condensed on the edge of the condensation knife is collected on the drainage scraper by scraping, and then merged into the secondary condensation zone.

[0013] Preferably, the secondary condensation zone includes a conduit connected to the collection assembly, and a collecting channel that collects the conduits. The collecting channel extends downward to form an attachment layer arranged around the tank body. The attachment layer is formed by a thin plate extending from the conduit and close to the outer wall of the tank body. A collecting ring is provided below the attachment layer. After the collected condensed oil body is merged into the collecting channel, it flows downstream along the attachment layer. During the flow, the heavy components in the tank body are cooled and condensed.

[0014] Preferably, the heavy component condensation collection area uses the thinner inner wall area of ​​the tank body as the condensation wall, and the condensation wall is in contact with the area surrounding the feed pipe. The heavy component condensation collection area includes a rotating spiral scraper, and the blade of the spiral scraper is in contact with the condensation wall. A collection tank is provided below the condensation wall. The thinner inner wall area is used as the condensation wall to enhance the heat exchange efficiency between this area and the outside to achieve a better cooling effect, so that the heavy component condenses in this area, and the condensed heavy component oil body is pushed into the collection tank by the push of the spiral scraper.

[0015] Preferably, a plurality of grid plates are provided on the outside of the attachment layer, and a sealing valve is provided on the collecting ring. When different batches of crude oil are distilled, the contents of light and heavy components in different crude oils are different. When the content of light components is low, the amount of condensed light component oil is small. By closing the sealing valve, the condensed oil is retained in the secondary condensation zone for a longer time, so that the heavy component oil with a higher content can be condensed, thereby ensuring the condensation effect.

[0016] Compared with the prior art, the present invention provides a molecular distillation device for diglyceride edible oil that can be cooled quickly, which has the following beneficial effects:

[0017] 1. The device completely separates the light component condensation area from the heavy component condensation area. The light component condensation area is set at the top of the evaporation tower. The heavy component cannot rise to the light component condensation area, so the impurity content of the oil condensed by the light component is further reduced, ensuring the purity of the light component condensed oil;

[0018] 2. The condensation of light components is achieved through the semiconductor refrigeration module. The refrigerant of the semiconductor refrigeration module acts on the light components, and its hot end is connected to the feed pipe. The crude oil takes away the heat from the hot end of the semiconductor refrigeration module, while completing the initial heating of the crude oil during the feeding process, thereby reducing the energy consumption of the distillation device for evaporating the crude oil;

[0019] 3. The oil condensed by this semiconductor refrigeration module is connected to the heavy component condensation area to condense the heavy component, thereby increasing energy utilization efficiency, improving condensation effect, and reducing energy consumption requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall appearance and structure of a molecular distillation device for diglyceride edible oil capable of rapid cooling according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the internal structure of a molecular distillation device for diglyceride edible oil capable of rapid cooling according to the present invention;

[0022] Figure 3 This is a front view of the internal structure of a molecular distillation device for diglyceride edible oil capable of rapid cooling according to the present invention;

[0023] Figure 4 This is a schematic structural diagram of a light component condensation and collection area of ​​a diglyceride edible oil molecular distillation device capable of rapid cooling according to the present invention;

[0024] Figure 5 This is a schematic diagram of the transmission structure of the light component condensation and collection area of ​​a diglyceride edible oil molecular distillation device capable of rapid cooling according to the present invention;

[0025] Figure 6 This is a schematic structural diagram of a condensation component and a collection component of a diglyceride edible oil molecular distillation device capable of rapid cooling according to the present invention;

[0026] Figure 7 The present invention is a schematic structural diagram of the secondary condensation zone of a molecular distillation device for diglyceride edible oil that can be cooled rapidly.

[0027] In the picture:

[0028] 1. Tank body;

[0029] 2. Light component condensation collection area; 21. Drive motor; 22. Connecting plate; 23. Twisted shaft; 24. Condensation assembly; 25. Isolation cover; 26. Collection assembly;

[0030] 241. Sliding part; 242. Fixing rod; 243. Condensation knife; 244. Refrigerant pipeline;

[0031] 261, attachment plate; 262, partition plate; 263, drainage scraper;

[0032] 3. Feeding pipe;

[0033] 4. Secondary condensation zone; 41. Conduit; 42. Concentrating channel; 43. Adhesive layer; 44. Grid plate; 45. Converging ring;

[0034] 5. Evaporation plate; 6. Semiconductor mounting seat; 7. Heavy component condensation collection area; 71. Spiral scraper; 72. Collection tank. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] As described in the background art, the prior art has deficiencies. In order to solve the above technical problems, the present application proposes a molecular distillation device for diglyceride edible oil that can be cooled quickly.

[0037] Example 1, as Figure 1-Figure 7 As shown, a molecular distillation device for diglyceride edible oil with rapid cooling includes a tank body 1, a semiconductor mounting seat 6 is provided in the middle of the tank body 1, a light component condensation collection area 2 and a heavy component condensation collection area 7 are provided above and below the semiconductor mounting seat 6, respectively, wherein a secondary condensation zone 4 is provided outside the heavy component condensation collection area 7, and an evaporation tray 5 is provided at the bottom end of the tank body 1, as well as a vacuum pump for evacuating the interior of the tank body 1;

[0038] The semiconductor mounting seat 6 is connected to a feeding pipe 3 for loading materials, and the crude oil fed by the feeding pipe 3 contacts the hot end of the semiconductor refrigeration module in the semiconductor mounting seat 6, which is used to initially heat the crude oil, and then falls into the evaporation tray 5 and completes vaporization in the evaporation tray 5, providing conditions for subsequent condensation. The cold end of the semiconductor refrigeration module in the semiconductor mounting seat 6 is connected to a water cooling system and is connected to the light component condensation collection area 2, which is used to condense the gas evaporated from the evaporation tray 5, wherein the light component condensation collection area 2 contains a collection component 26, and the collection component 26 guides the liquid edible oil condensed in the light component condensation collection area 2 to the secondary condensation interval 4. At this time, the edible oil initially condensed by the condensation system is in a relatively low temperature state, and after flowing into the secondary condensation interval 4, it is in a large temperature difference state with the heavy component condensation collection area 7 contained therein, and is used as a refrigerant for the condensation of the heavy component in the heavy component condensation collection area 7, and assists the heavy component in the heavy component condensation collection area 7 to condense into a liquid state.

[0039] For details, see Example 2 Figure 2 and Figure 3 As shown, the light component condensation collection area 2 includes a power source drive motor 21, a transmission device connecting disk 22 and a twisted shaft 23. The drive motor 21 drives the twisted shaft 23 to rotate. During the rotation, the connecting disk 22 is driven to reciprocate up and down through the restriction of two positioning rods extending from the semiconductor mounting seat 6.

[0040] See Figures 4 to 6 As shown, the light component condensation collection area 2 also includes a condensation component 24 and a partition 25. The condensation component 24 includes a main sliding part 241, a positioning device fixing rod 242, a condensation knife 243 and a refrigerant pipeline 244, wherein the refrigerant pipeline 244 is connected to the cold end of the semiconductor refrigeration module, and a pump body is provided to drive the flow of the refrigerant in the pipeline. When the refrigerant flows into the sliding part 241, it acts on the condensation knife 243 to achieve the effect of condensing edible oil on the condensation knife 243. The partition 25 is arranged to fit the movement path of the condensation knife 243 to isolate the light component vapor from the transmission structure.

[0041] In addition, a connecting rod is set between the sliding member 241 and the connecting disk 22, and the connecting rod is rotatably connected to both. The fixed rod 242 is a rod-shaped structure fixed to the inner wall of the light component condensation collection area 2. The two fixed rods 242 are inserted into the sliding member 241 and slidably connected thereto, which is used to limit the sliding member 241 so that the connecting disk 22 pushes the sliding member 241 to reciprocate back and forth along the fixed rod 242 during the up and down reciprocating motion. The collecting assembly 26 includes two attached plates 261 installed on the inner wall of the tank body 1, and the two attached plates 261 are connected between them. It is connected with a partition 262, which cooperates with the inner wall of the tank body 1 to form an oil transfer channel. At the same time, a drainage scraper 263 is connected in the middle of the two attached plates 261. The drainage scraper 263 extends upward to dock with the condensation knife 243, and a groove is provided on the drainage scraper 263 to match the cutting edge of the condensation knife 243, so that the liquid edible oil condensed by the condensation knife 243 during the reciprocating motion back and forth is collected on the drainage scraper 263, and then flows in the oil transfer channel by adhering to the two sides of the drainage scraper 263, and then is collected in the secondary condensation zone 4.

[0042] See Figure 3 As shown, the hot end of the refrigeration module is equipped with a spiral pipeline to increase the contact time between the crude oil and the hot end. This not only enhances the initial heating effect of the crude oil, but also relieves the heat dissipation pressure of the semiconductor refrigeration module and increases the cooling effect of the semiconductor refrigeration module's cold end. It should be noted that the evaporation device and vacuum pump used in semiconductor refrigeration and condensation distillation are both existing technologies. Since these devices are not relevant to the condensation part of this case, they are not shown in detail in the diagram.

[0043] Example 3, see Figure 2 、 Figure 3 and Figure 7 As shown, the secondary condensation zone 4 includes a conduit 41 connected to the collection assembly 26, and a collecting channel 42 that collects the conduits 41, wherein the collecting channel 42 has an attachment layer 43 extending downward, and the attachment layer 43 is formed by a thin plate close to the outer wall of the tank body 1, and a plurality of grid plates 44 are provided on the outside of the attachment layer 43 to increase the heat dissipation effect of the refrigerant in the attachment layer 43. At the same time, a collecting ring 45 is provided below the attachment layer 43 to finally collect the condensed edible oil. At the same time, a sealing valve is provided on the collecting ring 45 to control the final output of the oil.

[0044] The heavy component condensation collection area 7 uses the thinner inner wall of the tank body 1 as the condensation wall. By reducing the thickness of this area, the heat exchange efficiency between the heavy component vapor inside the tank body 1 and the outside is increased, so as to increase the condensation effect of the heavy component vapor in this area. The heavy component condensation collection area 7 includes a rotating spiral scraper 71. The cutting edge of the spiral scraper 71 is in contact with the inner wall of the condensation. During the rotation, the condensate is pushed downward. At the same time, a collection tank 72 is provided below the inner wall of the condensation to collect the collected condensate into the collection tank 72 and discharge it later.

[0045] The edible oil flowing into the centralized channel 42 is condensed at the condensation knife 243 and has a relatively low temperature. When it flows into the attachment layer 43, it is still in a state of large temperature difference with the heavy component gas in the heavy component condensation collection area 7, and can be used as a refrigerant in the heavy component condensation collection area 7. After the gas in the heavy component condensation collection area 7 is cooled and condensed, the gas in the attachment layer 43 flows downward into the collecting ring 45 and is subsequently discharged through the control valve.

[0046] The oil evaporated from the evaporator 5 contains different ratios of heavy components to light components, resulting in different amounts of heavy and light components evaporated each time. This results in different amounts of oil condensed in the light component condensation and collection area 2 and the heavy component condensation and collection area 7. When the light component content is high, more oil condenses in the light component condensation and collection area 2. In this case, sufficient oil flows into the secondary condensation zone 4 and can effectively serve as a refrigerant for the condensation of heavy components in the heavy component condensation and collection area 7. When the light component content is low, less oil condenses in the light component condensation and collection area 2, and insufficient oil flows into the secondary condensation zone 4, resulting in ineffective cooling of the heavy component gas in the heavy component condensation and collection area 7. In this case, the control valve in the collection ring 45 is closed to collect the oil flowing into the secondary condensation zone 4. After a longer evaporation time, the amount of oil condensed from the light component increases and gradually flows into the secondary condensation zone 4. By extending the residence time of the oil in the secondary condensation zone 4, the condensation effect on the heavy component gas is enhanced.

[0047] The device completely separates the light component condensation area from the heavy component condensation area. The light component condensation area is arranged at the inner top of the evaporation tower. The heavy component cannot rise to the light component condensation area, so that the impurity content of the oil condensed by the light component is further reduced, thereby ensuring the purity of the light component condensed oil. In addition, the condensation of the light component is achieved through a semiconductor refrigeration module. The refrigerant of the semiconductor refrigeration module acts on the light component, and its hot end is connected to the feed pipe. While the crude oil takes away the heat from the hot end of the semiconductor refrigeration module, the initial heating of the crude oil is completed during the feeding process, so as to reduce the energy consumption of the distillation device for evaporating the crude oil. In addition, the oil condensed by the semiconductor refrigeration module is connected to the heavy component condensation area to condense the heavy component, so as to increase energy utilization efficiency, improve the condensation effect, and reduce energy consumption requirements.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A molecular distillation device for diglyceride edible oil capable of rapid cooling, comprising a tank body (1), characterized in that: A semiconductor mounting seat (6) is provided in the middle of the tank body (1), and a light component condensation collection area (2) and a heavy component condensation collection area (7) are provided above and below the semiconductor mounting seat (6), respectively, wherein a secondary condensation interval (4) is provided outside the heavy component condensation collection area (7), and an evaporation plate (5) is provided at the bottom end of the tank body (1). A semiconductor refrigeration module is provided in the semiconductor mounting seat (6), and a feeding pipe (3) for feeding is connected to the semiconductor mounting seat (6), crude oil is transported in the feeding pipe (3) and docked with the hot end of the semiconductor refrigeration module, and the cold end of the semiconductor refrigeration module is used for condensing the light component condensation collection area (2), and the secondary condensation interval (4) is connected to the light component condensation collection area (2), and the oil condensed in the light component condensation collection area (2) is merged into the secondary condensation interval (4) for condensing the steam in the heavy component condensation collection area (7); The light component condensation collection area (2) includes a transmission structure, a condensation component (24), and a collection component (26). A refrigerant pipeline (244) is provided in the condensation component (24), and the refrigerant pipeline (244) is connected to the cold end of the semiconductor refrigeration module. The condensate on the condensation component (24) is collected by the collection component (26) and then merged into the secondary condensation zone (4); The condensation assembly (24) includes a main body sliding member (241), a positioning device fixing rod (242) and a condensation knife (243), wherein the refrigerant pipeline (244) is connected to the sliding member (241) and contacts the condensation knife (243), the fixing rod (242) is fixedly installed on the inner wall of the tank body (1) and inserted into the sliding member (241), and the sliding member (241) slides along the fixing rod (242); The collecting assembly (26) includes two attached plates (261) mounted on the inner wall of the tank body (1), a partition (262) is connected between the two attached plates (261), and cooperates with the inner wall of the tank body (1) to form an oil conveying channel, and a drainage scraper (263) is connected in the middle of the two attached plates (261), the drainage scraper (263) extends upward to contact the condensation knife (243), and a groove is provided on the drainage scraper (263) to match the cutting edge of the condensation knife (243).

2. The rapid cooling diglyceride edible oil molecular distillation device according to claim 1, characterized in that: The transmission structure comprises a driving motor (21), a connecting disk (22) and a twisted shaft (23); the driving motor (21) drives the twisted shaft (23) to rotate; the connecting disk (22) is sleeved on the twisted shaft (23); two positioning rods are provided on the semiconductor mounting seat (6) and pass through the connecting disk (22); the rotation of the twisted shaft (23) can drive the connecting disk (22) to reciprocate up and down.

3. The rapid cooling diglyceride edible oil molecular distillation device according to claim 1, characterized in that: A connecting rod is provided between the sliding member (241) and the connecting disk (22), and the connecting rod is rotationally connected to the sliding member (241) and the connecting disk (22).

4. The rapid cooling diglyceride edible oil molecular distillation device according to claim 1, characterized in that: The secondary condensation zone (4) includes a conduit (41) connected to the collection assembly (26), and a centralizing channel (42) for collecting the conduits (41). The centralizing channel (42) extends downward to have an attachment layer (43) arranged around the tank body (1). The attachment layer (43) is formed by a thin plate extending from the conduit (41) and close to the outer wall of the tank body (1). A collecting ring (45) is arranged below the attachment layer (43).

5. The rapid cooling diglyceride edible oil molecular distillation device according to claim 4, characterized in that: The heavy component condensation collection area (7) uses the thinner inner wall area of ​​the tank body (1) as a condensation wall, and the condensation wall is in contact with the surrounding area of ​​the feed pipe (3). The heavy component condensation collection area (7) includes a rotating spiral scraper (71), the blade of the spiral scraper (71) is in contact with the condensation wall, and a collection tank (72) is provided below the condensation wall.

6. The rapid cooling diglyceride edible oil molecular distillation device according to claim 4, characterized in that: A plurality of grid plates (44) are provided outside the attachment layer (43), and a sealing valve is provided on the collection ring (45).

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