A heat exchange assembly with spiral heat exchange tubes

Abstract

This invention discloses a heat exchange assembly with a spiral heat exchange tube, relating to the field of heat exchange. It includes a housing and a tube sheet disposed inside the housing. A scraper is arranged radially along the tube sheet inside the housing. It also includes a power assembly. During heat exchange, the power assembly drives the scraper away from the tube sheet. When the system stops, the power assembly drives the scraper to contact the tube sheet and rotates the scraper. The heat exchange assembly with a spiral heat exchange tube provided by this invention has a scraper arranged radially along the tube sheet inside the housing. During heat exchange, the power assembly drives the scraper away from the tube sheet, thereby avoiding interference with the liquid flow on the tube sheet surface. When the system stops, the power assembly drives the scraper to contact the tube sheet and rotates the scraper. The rotation of the scraper helps the liquid on the tube sheet surface fall through the holes inside the tube sheet, minimizing liquid residue.

Description

Technical Field

[0001] This invention relates to the field of heat exchange, and more specifically to a heat exchange assembly with a spiral heat exchange tube. Background Technology

[0002] As is widely known, heat exchange technology is currently the mainstream energy-saving technology for treating high-salinity wastewater. Its core principle is to use a compressor to compress the secondary steam generated during evaporation, increasing its temperature and pressure, and then returning it to the heat exchanger as heating steam, thereby significantly reducing dependence on external fresh steam. Conventional heat exchange systems are mainly used for treating high-salinity wastewater in industries such as chemical, pharmaceutical, and food processing. The basic process flow includes pretreatment, evaporation and concentration, and crystallization separation.

[0003] For example, the Chinese patent document with authorization announcement number CN216482422U, announcement date of 2022-05-10, and titled "A Shell and Tube Graphite Heat Exchanger" includes a heat exchanger body, an outer shell on the outer surface of the heat exchanger body, a feed inlet at the top of the heat exchanger body, a discharge outlet at the bottom of the heat exchanger body, a mixing chamber below the feed inlet, an erosion-resistant plate on the inner wall of the mixing chamber, a conical filter layer inside the mixing chamber, collection grooves on both sides of the filter layer, a support rod below the filter layer, and the lower end of the mixing chamber connected to the upper end of the graphite tubes through a guide pipe. The filter layer can filter out particles and crystals in liquid materials, and the collection tank can collect particles and crystals. The installation of the scour-resistant plate allows the liquid material to pass through the filter layer and directly scour onto the scour-resistant plate, and then connect to the graphite tubes through the guide pipe, avoiding contact between the liquid material and the graphite body. This solves the problem that in existing graphite heat exchangers, fine particles or crystals in the liquid material scour and rub against the graphite surface during operation, causing scratches and damage to the graphite heat exchanger.

[0004] The shortcoming of the existing technology is that when the heat exchanger is shut down, some liquid remains on the surface of its tube sheet. Because high-salt wastewater is corrosive, the surface of the tube sheet is easily corroded, resulting in pits on the surface of the tube sheet, which affects the performance of the heat exchanger. Summary of the Invention

[0005] The purpose of this invention is to provide a heat exchange assembly with a spiral heat exchange tube to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A heat exchange assembly with a spiral heat exchange tube includes a housing and a tube sheet disposed inside the housing, wherein scrapers are arranged radially along the tube sheet inside the housing.

[0008] It also includes a power component. During the heat exchange process, the power component drives the scraper away from the tube sheet. When the machine stops, the power component drives the scraper to come into contact with the tube sheet and drives the scraper to rotate.

[0009] In the heat exchange assembly with spiral heat exchange tubes described above, a distributor is provided inside the shell, and a buffer plate is slidably disposed on the distributor.

[0010] In the aforementioned heat exchange assembly with a spiral heat exchange tube, a support frame is fixedly connected inside the shell, a buffer plate is elastically connected to the support frame, a sliding seat is provided on the support frame, a scraper is fixedly connected to the sliding seat, and the power assembly includes a first connecting rod rotatably disposed on the buffer plate and a second connecting rod rotatably disposed on the sliding seat, with the ends of the first connecting rod and the second connecting rod rotatably connected to each other.

[0011] The heat exchange assembly with a spiral heat exchange tube described above further includes a drive rod fixed to the support frame, and a drive groove is provided inside the sliding seat, with the drive rod slidably connected to the drive groove.

[0012] The heat exchange assembly with a spiral heat exchange tube described above includes a scraper comprising a first section and a second section that are slidably connected to each other.

[0013] The heat exchange assembly with a spiral heat exchange tube described above has a heat exchange tube body disposed on the tube sheet, and the heat exchange tube body has an elliptical cross-section.

[0014] The heat exchange assembly with a spiral heat exchange tube described above has spiral ribs inside the heat exchange tube body.

[0015] In the aforementioned heat exchange assembly with spiral heat exchange tubes, the distributor is provided with a storage mechanism. When there is too much liquid inside the distributor, the excess liquid will enter the storage mechanism. When there is too little liquid in the distributor, the liquid inside the storage mechanism will be replenished to the tube sheet.

[0016] The heat exchange assembly with spiral heat exchange tubes described above includes a storage mechanism comprising a casing disposed outside the tube sheet, the casing having multiple liquid replenishment ports, and a sealing assembly for controlling the opening and closing of the liquid replenishment ports.

[0017] The heat exchange assembly with a spiral heat exchange tube described above includes a housing comprising a base plate fixed to the distributor and a side plate rotatably disposed on the base plate, a sealing assembly comprising a sealing ring fixed to the side plate, a crossbar disposed between the side plate and the buffer plate, and a vertical bar disposed between the distributor and the housing.

[0018] In the above technical solution, the present invention provides a heat exchange assembly with a spiral heat exchange tube. Inside the shell, a scraper is arranged radially along the tube sheet. During the heat exchange process, the power assembly drives the scraper away from the tube sheet, thereby avoiding the scraper interfering with the flow of liquid on the tube sheet surface. When the machine stops, the power assembly drives the scraper to fit against the tube sheet and rotates the scraper. The rotation of the scraper helps the liquid on the tube sheet surface to fall through the holes inside the tube sheet, so as to minimize liquid residue. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a partial cross-sectional structural schematic diagram provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0022] Figure 3 This is a schematic diagram of the overall structure of the distributor provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of another perspective distributor provided in an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Enlarged schematic diagram of the local structure at point B;

[0025] Figure 6 This is a schematic diagram of the overall structure of the distributor provided in another embodiment of the present invention;

[0026] Figure 7 This is a top view of the distributor structure provided in another embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Shell; 2. Tube sheet; 3. Scraper; 301. First section; 302. Second section; 4. Inlet pipe; 5. Distributor; 6. Buffer plate; 7. Support frame; 701. Vertical section; 702. Horizontal section; 8. Sliding seat; 9. First connecting rod; 10. Second connecting rod; 11. Vertical groove; 12. Spring; 13. Connecting shaft; 14. Drive rod; 15. Drive groove; 16. Heat exchange tube body; 17. Spiral rib; 18. Shell; 1801. Bottom plate; 1802. Side plate; 19. Liquid replenishment port; 20. Storage area; 21. Sealing ring; 22. Horizontal bar; 23. Vertical bar; 25. Arc-shaped hole; 26. Auxiliary rod. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the description of this invention, it should be understood that... Figure 1 The position of the distributor 5 relative to the scraper 3 is above, and vice versa. The terms "center", "longitudinal", "transverse", "length", "width", "degree", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limiting the present invention.

[0031] Reference Figure 1-7 The present invention provides a heat exchange assembly with a spiral heat exchange tube, including a housing 1 and a tube sheet 2 disposed inside the housing 1, wherein a scraper 3 is disposed inside the housing 1 and arranged radially along the tube sheet 2.

[0032] It also includes a power component. During the heat exchange process, the power component drives the scraper 3 away from the tube sheet 2. When the machine stops, the power component drives the scraper 3 to fit against the tube sheet 2 and drives the scraper 3 to rotate.

[0033] Specifically, the shell 1 is a vertically arranged circular shell structure with a liquid inlet pipe 4 at the top and a steam inlet (not shown) on the side. The tube plate 2 is coaxially arranged with the shell 1 and close to the top of the shell 1. The tube plate 2 has multiple through holes communicating with the heat exchange tube body 16. During heat exchange, steam is introduced into the shell 1 through the steam inlet. The heat of the steam is transferred to the liquid through the tube wall of the heat exchange tube body 16 to realize the heat exchange process, thereby evaporating and concentrating the liquid. This is prior art and will not be elaborated. One of the core innovations of this embodiment is that a scraper 3 is arranged radially along the tube plate 2 inside the shell 1, and a power assembly is installed inside the shell 1. The power assembly can be a combination of an electric push rod and a motor. The electric push rod provides reciprocating driving force to control the contact and separation between the scraper 3 and the surface of the tube sheet 2. The motor provides the power required for the scraper 3 to rotate. The purpose of this arrangement is that during the heat exchange process, the power assembly drives the scraper 3 to move away from the tube sheet 2, that is, the scraper 3 is suspended above the tube sheet 2, which can prevent the scraper 3 from interfering with the flow of liquid on the surface of the tube sheet 2. When the machine stops, the power assembly drives the scraper 3 to contact the tube sheet 2 and simultaneously drives the scraper 3 to rotate. The rotation of the scraper 3 can help the liquid on the surface of the tube sheet 2 fall through the holes inside the tube sheet 2, so as to minimize the residue of liquid.

[0034] Furthermore, a distributor 5 is provided inside the housing 1, and a buffer plate 6 is slidably disposed on the distributor 5. Specifically, the distributor 5 has a barrel-shaped structure, which may be fixed inside the housing 1. The buffer plate 6 is slidably disposed in the middle position of the distributor 5 via a vertical rod (that is, the vertical rod is part of the buffer plate 6), and the buffer plate 6 is located directly below the liquid inlet pipe 4. The purpose of this arrangement is that the liquid flowing into the housing 1 through the liquid inlet pipe 4 will first impact the upper surface of the buffer plate 6 for buffering, and then flow along the surface of the buffer plate 6 into the distributor 5 to achieve a buffering effect.

[0035] Furthermore, a support frame 7 is fixedly connected inside the housing 1, the buffer plate 6 is elastically connected to the support frame 7, a sliding seat 8 is provided on the support frame 7, the scraper 3 is fixedly connected to the sliding seat 8, and the power assembly includes a first connecting rod 9 rotatably disposed on the buffer plate 6 and a second connecting rod 10 rotatably disposed on the sliding seat 8, with the ends of the first connecting rod 9 and the second connecting rod 10 rotatably connected to each other. Specifically, the support frame 7 includes two horizontal sections 702 and a vertical section 701. The two horizontal sections 702 are symmetrically arranged on the outer circumference of the vertical section 701, and the end of the horizontal section 702 away from the vertical section 701 is fixed to the inner wall of the housing 1. That is, the vertical section 701 is supported between the distributor 5 and the tube sheet 2 through the two horizontal sections 702. The bottom of the buffer plate 6 has a vertical groove 11 inside the upright. A spring 12 is elastically arranged between the top of the vertical section 701 and the top wall of the vertical groove 11. The sliding seat 8 is cylindrical and is slidably connected to the bottom of the vertical section 701. There are multiple scrapers 3. The array is arranged on the outer circumference of the sliding seat 8. A rotating shaft is provided on both the upright and the sliding seat 8. The ends of the first connecting rod 9 and the second connecting rod 10 that are far apart are rotatably connected to the rotating shaft. A connecting shaft 13 is provided on the ends of the first connecting rod 9 and the second connecting rod 10 that are close together. The first connecting rod 9 and the second connecting rod 10 are rotatably connected through the connecting shaft 13. The scraper 3 can be made of an elastic material. There are two of each of the first connecting rod 9 and the second connecting rod 10, and they are symmetrically arranged about the vertical section 701. The purpose of this arrangement is that when no liquid enters the inlet pipe 4, the buffer plate 6 is placed in a high position under the action of the spring force of the spring 12. Under the action of rod 9 and the second connecting rod 10, the sliding seat 8 and scraper 3 are placed in a low position (at this time, scraper 3 is in contact with tube plate 2). When evaporation is required, liquid is injected into the shell 1 through the liquid inlet pipe 4. During this process, the liquid will exert an impact force on the buffer plate 6. When the impact force is greater than the elastic force of spring 12, it will drive the buffer plate 6 to move downward and store force on spring 12. During the downward movement of the buffer plate 6, under the action of the rotational connection of the first connecting rod 9 and the second connecting rod 10, the sliding seat 8 and scraper 3 move upward, thereby causing scraper 3 to passively move away from tube plate 2 to achieve avoidance. When stopping... When the liquid inlet pipe 4 stops entering the machine, the spring force of spring 12 is released instantly, thereby driving the buffer plate 6 to move upward. Under the action of the first link 9 and the second link 10, the sliding seat 8 and the scraper 3 will move downward. Under the inertia driven by spring 12, the buffer plate 6 will shake up and down (with a delay), thereby driving the scraper 3 to rotate back and forth. The advantage of this setting is that the scraper 3 can be passively switched between the position of being in contact with the tube plate 2 and the position of being far away from the tube plate 2. In this process, spring 12 can not only improve the buffering effect, but also provide power for the scraper 3 to switch.

[0036] Furthermore, the power assembly also includes a drive rod 14 fixed to the support frame 7, and a drive groove 15 is provided inside the sliding seat 8, with the drive rod 14 slidably connected to the drive groove 15. Specifically, the drive rod 14 is fixed to the outer circumferential surface of the vertical section 701. It is preferably a cylindrical rod, and there are preferably two drive rods 14. The two drive rods 14 are symmetrically arranged about the vertical section 701. The drive groove 15 is preferably an inclined groove. The drive groove 15 is arranged along the inner circumferential surface of the sliding seat 8, and the heights at both ends of the drive groove 15 are different. There are two drive grooves 15, and the positions of the two drive grooves 15 correspond to the positions of the two drive rods 14. The purpose of this arrangement is that during the lifting and lowering process of the sliding seat 8, the drive rod 14 will slide along the drive groove 15. Since the drive groove 15 is inclined, the sliding seat 8 will rotate while lifting and lowering. That is, when the scraper 3 rotates and moves downward, it will drive the bottom end of the scraper 3 to contact the upper surface of the tube plate 2. When the scraper 3 moves downward and rotates, it will slide along the upper surface of the tube plate 2. During this process, the scraper 3 itself is deformed by pressure to adapt to its own downward stroke, so as to achieve the effect of passive scraping.

[0037] Preferably, the scraper 3 includes a first segment 301 and a second segment 302 that are slidably connected to each other. Specifically, the first segment 301 is fixed to the outer peripheral surface of the sliding seat 8, and the second segment 302 is slidably connected to the bottom end of the first segment 301 through a groove structure. The two segments have a limiting structure to prevent them from separating. The purpose of this arrangement is that after the second segment 302 contacts the tube plate 2, it cannot continue to move downward, but the first segment 301 can continue to move downward. Therefore, the second segment 302 moves upward relative to the first segment 301 along the groove to match the downward stroke of the first segment 301. The advantage of this method compared to the deformation of the scraper 3 itself is that it can reduce the resistance during the rotation of the scraper 3.

[0038] Preferably, the tube sheet 2 is provided with a heat exchange tube body 16, and the heat exchange tube body 16 has an elliptical cross-section. Specifically, for the same area, the elliptical cross-section of the heat exchange tube body 16 has a larger perimeter than the circular cross-section, thereby increasing the film area and thus improving the heat exchange efficiency.

[0039] Furthermore, the heat exchange tube body 16 is provided with spiral ribs 17 inside. Specifically, the spiral ribs 17 are arranged on the inner wall of the heat exchange tube body 16, which can cause the liquid entering the heat exchange tube body 16 to generate swirling flow, thereby reducing the empty area of ​​the heat exchange tube body 16.

[0040] It should be noted that when a large amount of liquid enters through the inlet pipe 4, the liquid level inside the distributor 5 will rise rapidly, resulting in greater liquid pressure at the orifice location. This will accelerate the liquid flow rate and increase the amount of liquid on the surface of the tube sheet 2, thus affecting the liquid film distribution effect. Conversely, when there is less liquid inside the distributor 5, the amount of liquid flowing to the surface of the tube sheet 2 will also decrease, easily causing uneven film distribution or an excessively thin film, which will lead to excessive evaporation of the liquid and subsequent scaling. To solve the above problems, as another embodiment of the present invention, the distributor 5 is provided with a storage mechanism. When there is too much liquid inside the distributor 5, the excess liquid will enter the storage mechanism. When there is too little liquid in the distributor 5, the liquid inside the storage mechanism will replenish the tube sheet 2.

[0041] Preferably, the storage mechanism includes a housing 18 disposed outside the tube sheet 2, the housing 18 having a plurality of liquid replenishment ports 19, and also includes a sealing component for controlling the opening and closing of the liquid replenishment ports 19. Specifically, the housing 18 is annular, with an L-shaped cross-section on one side. The space between the inner wall of the housing 18 and the outer wall of the distributor 5 is the storage area 20. Multiple replenishment ports 19 are arrayed on the inner bottom wall of the housing 18. The sealing assembly can be multiple valves arranged one-to-one with the multiple replenishment ports 19. The valves can control the opening and closing of the replenishment ports 19. The purpose of this arrangement is that when there is too much liquid inside the distributor 5, the excess liquid will overflow from the top of the distributor 5 into the storage area 20 for temporary storage. When there is too little liquid inside the distributor 5, the sealing assembly opens the replenishment ports 19, allowing the liquid in the storage area 20 to be discharged onto the tube sheet 2 for replenishment. When the machine is stopped, the replenishment ports 19 are also placed in the open state to discharge the liquid in the storage area 20 onto the tube sheet 2.

[0042] As an alternative to the valve control for opening and closing of the replenishment port 19, preferably, the housing 18 includes a base plate 1801 fixed to the distributor 5 and a side plate 1802 rotatably disposed on the base plate 1801. The sealing assembly includes a sealing ring 21 fixed to the side plate 1802. A crossbar 22 is provided between the side plate 1802 and the buffer plate 6, and a vertical bar 23 is provided between the distributor 5 and the housing 1. Specifically, the inner wall of the housing 1 has an annular groove adapted to the side plate 1802. The side plate 1802 is rotatably connected to the annular groove. The sealing ring 21 is coaxially arranged with the bottom plate 1801 and embedded in the upper surface of the bottom plate 1801. Multiple arc-shaped holes 25 are formed inside the sealing ring 21, which are respectively arranged with multiple liquid replenishment ports 19. The sealing ring 21 is fixed to the side plate 1802 by a crossbar 22. The height of the side plate 1802 is higher than the height of the distributor 5. There are two crossbars 22, and their two ends are respectively connected to the side of the buffer plate 6. The side plate 1802 is fixed to the inner circumferential surface. There are also two vertical rods 23, with their ends fixed to the inner top wall of the housing 1 and the top of the distributor 5, respectively. The lines connecting the two horizontal rods 22 and the two vertical rods 23 are arranged vertically on the horizontal plane. This arrangement ensures that when the machine stops, the arc-shaped hole 25 coincides with the position of the liquid inlet 19, and the liquid inlet 19 is in a conductive state. When liquid impacts the buffer plate 6 from the inlet pipe 4, the buffer plate 6 will move downwards, thereby causing the sliding seat 8 to rotate and move upwards simultaneously. During this process… The first connecting rod 9 and the second connecting rod 10 drive the buffer plate 6 to rotate synchronously. Since the side plate 1802 is fixed to the buffer plate 6 through the crossbar 22, it drives the side plate 1802 and the sealing ring 21 to rotate, causing the arc-shaped hole 25 on the sealing ring 21 to be misaligned with the liquid inlet 19. At this time, the solid part of the sealing ring 21 seals the liquid inlet 19 to achieve the function of storing liquid. When the liquid inside the distributor 5 is too little, that is, when the liquid volume inside the liquid inlet pipe 4 is reduced, the impact force on the buffer plate 6 becomes smaller. When the impact force is less than the elastic force of the spring 12, the spring 12 pushes the buffer plate 6 upward, thereby causing the sliding seat 8 to move downward. Under the action of the drive rod 14 and the drive groove 15, the sliding seat 8, the side plate 1802 and the sealing ring 21 rotate in the opposite direction, so that the arc-shaped hole 25 coincides with the liquid replenishment port 19, thereby passively opening the liquid replenishment port 19. Similarly, when the liquid inside the distributor 5 increases, it will drive the sealing ring 21 to rotate in the opposite direction to seal the liquid replenishment port 19 again. In this way, multiple liquid replenishment ports 19 are opened and closed synchronously and passively.

[0043] Furthermore, multiple auxiliary rods 26 are fixedly connected to the sealing ring 21. Specifically, the auxiliary rods 26 have a T-shaped cross-section and multiple sets of them are arranged in an array on the upper surface of the sealing ring 21. The purpose of this arrangement is that when the sealing ring 21 rotates to open the liquid inlet 19, it will drive the auxiliary rods 26 to rotate synchronously with the sealing ring 21, so as to stir the liquid temporarily stored in the storage area 20 and prevent the deposition of impurities inside.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heat exchange assembly with spiral heat exchange tubes, comprising a housing and a tube sheet disposed inside the housing, characterized in that, The housing is provided with scrapers arranged radially along the tube sheet; It also includes a power component, which drives the scraper away from the tube sheet during the heat exchange process, and drives the scraper to come into contact with the tube sheet when the machine stops, and drives the scraper to rotate. A distributor is provided inside the housing, and a buffer plate is slidably mounted on the distributor. A support frame is fixedly connected inside the housing. The buffer plate is elastically connected to the support frame. A sliding seat is provided on the support frame. The scraper is fixedly connected to the sliding seat. The power assembly includes a first connecting rod rotatably disposed on the buffer plate and a second connecting rod rotatably disposed on the sliding seat. The ends of the first connecting rod and the second connecting rod that are close to each other are rotatably connected. The power assembly also includes a drive rod fixed to the support frame, and a drive groove is provided inside the sliding seat, with the drive rod slidably connected to the drive groove.

2. A heat exchange assembly with a spiral heat exchange tube according to claim 1, characterized in that, The scraper comprises a first section and a second section that are slidably connected to each other.

3. A heat exchange assembly with a spiral heat exchange tube according to claim 1, characterized in that, The tube sheet is provided with a heat exchange tube body, and the heat exchange tube body has an elliptical cross-section.

4. A heat exchange assembly with a spiral heat exchange tube according to claim 3, characterized in that, The heat exchange tube body is provided with spiral ribs inside.

5. A heat exchange assembly with a spiral heat exchange tube according to claim 1, characterized in that, The distributor is equipped with a storage mechanism. When there is too much liquid inside the distributor, the excess liquid will enter the storage mechanism. When there is too little liquid in the distributor, the liquid inside the storage mechanism will be replenished to the tube sheet.

6. A heat exchange assembly with a spiral heat exchange tube according to claim 5, characterized in that, The storage mechanism includes a casing disposed outside the tube sheet, the casing having multiple liquid inlets, and a sealing component for controlling the opening and closing of the liquid inlets.

7. A heat exchange assembly with a spiral heat exchange tube according to claim 6, characterized in that, The housing includes a base plate fixed to the distributor and a side plate rotatably mounted on the base plate. The sealing assembly includes a sealing ring fixed to the side plate. A crossbar is provided between the side plate and the buffer plate, and a vertical bar is provided between the distributor and the housing.

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