Pivot device, drum evaporator and ice making apparatus

Abstract

The application relates to the technical field of ice making, in particular to a rotating shaft device, a drum evaporator and ice making equipment. The rotating shaft device comprises a central shaft, an oil seal module and a sealing core module. A shaft sleeve is sleeved on the outer periphery of the central shaft, and the inner wall of the shaft sleeve and the outer wall of the central shaft are arranged at intervals. The oil seal module is sleeved on the outer periphery of the central shaft and located between the central shaft and the shaft sleeve. The sealing core module is sleeved on the outer periphery of the central shaft and located between the central shaft and the shaft sleeve. The sealing core module and the oil seal module are arranged side by side along the axis direction of the central shaft, and the sealing core module and the inner wall of the shaft sleeve and the outer wall of the central shaft are in abutting contact. The drum evaporator comprises an evaporation drum, a support shaft and the rotating shaft device, and the support shaft and the rotating shaft device are arranged at opposite ends of the evaporation drum. The ice making equipment comprises a refrigeration system and the drum evaporator, and the refrigeration system is connected to the evaporation drum. The sealing effect of the rotating shaft device is good, and the refrigerant in the evaporation drum can be effectively prevented from leaking.

Description

Technical Field

[0001] This application relates to the field of ice-making technology, and in particular to a rotating shaft device, a drum evaporator, and ice-making equipment. Background Technology

[0002] Ice-making equipment, as a device for quickly producing ice, can be used in industrial settings as well as in homes, small shops, offices, and other places to bring convenience to users. Shaved ice making equipment, in particular, is often used in the production of desserts or cold drinks and is especially popular.

[0003] In related technologies, shaved ice making equipment typically uses a drum evaporator with blades to produce shaved ice. For example, when ice forms on the surface of the drum evaporator, it rotates, causing the ice to rotate as well. A portion of the ice is scraped off by the blades, thus producing shaved ice. The drum evaporator is usually hollow and rotatably mounted inside the ice-making equipment via a rotating shaft. Since refrigerant needs to pass through the inside of the drum evaporator, refrigerant pipes must be installed inside. Typically, these refrigerant pipes pass through the rotating shaft, necessitating a sealing structure between the shaft and the drum evaporator to prevent refrigerant leakage from inside the drum evaporator.

[0004] Typically, the sealing structure between the rotating shaft and the drum evaporator is achieved by using a hole-shaft fit with a superimposed sealing ring. However, because the drum evaporator rotates relative to the rotating shaft, the sealing structure of the sealing ring during rotational engagement is relatively weak, resulting in poor sealing performance and significant refrigerant leakage. Utility Model Content

[0005] In view of this, embodiments of this application provide a rotating shaft device, a drum evaporator, and an ice-making device to solve the above-mentioned technical problems.

[0006] In a first aspect, embodiments of this application provide a rotating shaft device, including a central shaft, an oil seal module, and a sealing core module. A bushing is sleeved on the outer periphery of the central shaft, with the inner wall of the bushing and the outer wall of the central shaft spaced apart. The oil seal module is sleeved on the outside of the central shaft and located between the central shaft and the bushing. The sealing core module is sleeved on the outside of the central shaft and located between the central shaft and the bushing. The sealing core module and the oil seal module are arranged side by side along the axial direction of the central shaft, and the sealing core module abuts against the inner wall of the bushing and the outer wall of the central shaft, respectively.

[0007] In some optional embodiments, the sealing core module includes a sealing bracket, a first sealing ring, and a second sealing ring; the sealing bracket is sleeved outside the central shaft and located between the central shaft and the bushing; the first sealing ring is disposed between the bushing and the sealing bracket; and the second sealing ring is disposed between the sealing bracket and the central shaft.

[0008] In some optional embodiments, the sealing bracket is anti-rotationally connected to the bushing, the sealing bracket has an outer peripheral wall facing the bushing, the outer peripheral wall is provided with a first groove, and a first sealing ring is disposed in the first groove and abuts against the bushing.

[0009] In some optional embodiments, an adhesive is provided between the outer peripheral wall and the bushing.

[0010] In some optional embodiments, an adhesive is provided between the first sealing ring and the bushing.

[0011] In some optional embodiments, the sealing bracket has an inner peripheral wall facing the central axis, the inner peripheral wall being spaced from the central axis, the inner peripheral wall having a second groove, and a second sealing ring being disposed in the second groove and abutting against the central axis.

[0012] In some optional embodiments, the second sealing ring is provided with a plurality of raised ribs on the side facing the central axis. The plurality of raised ribs are arranged sequentially at intervals along the axial direction of the central axis and respectively abut against the central axis.

[0013] In some optional embodiments, the second sealing ring has an oil reservoir for storing lubricating oil on the side facing the central axis.

[0014] In some optional embodiments, the oil seal module includes an oil seal bracket and an oil seal ring. The oil seal bracket is sleeved on the outer periphery of the central shaft and is interference-fitted with the shaft sleeve. The oil seal ring is disposed between the oil seal bracket and the central shaft.

[0015] In some optional embodiments, the oil seal bracket has a receiving groove on the side facing the central axis, the oil seal ring is partially embedded in the receiving groove and abuts against the central axis; the oil seal ring has an oil storage groove on the side facing the central axis for storing lubricating oil.

[0016] In some optional embodiments, the rotating shaft device further includes a bearing and an outer end cover. The bearing is disposed between the central shaft and the bushing and is arranged in parallel with the oil seal module. The outer end cover is sleeved outside the central shaft and located on the side of the bearing away from the oil seal module. The outer end cover covers one end of the bushing.

[0017] In some optional embodiments, the bushing includes a first sleeve portion and a second sleeve portion connected in sequence. The inner diameter of the first sleeve portion is smaller than the inner diameter of the second sleeve portion. An oil seal module and a sealing core module are disposed in the first sleeve portion. A stepped surface is formed between the first sleeve portion and the second sleeve portion, and the bearing is stacked on the stepped surface.

[0018] In some optional embodiments, the inner wall of the bushing is provided with internal threads, and the outer end cover is provided with external threads. The outer end cover is connected to the internal threads through the external threads. The rotating shaft device also includes a retaining ring. The outer end cover is provided with a first retaining ring groove on the side facing the central shaft, and the central shaft is provided with a second retaining ring groove. The retaining ring is accommodated in the first retaining ring groove and the second retaining ring groove.

[0019] In some optional embodiments, the rotating shaft device further includes a sealing ring, which is sleeved outside the central shaft and located between the oil seal module and the sealing core module; both sides of the sealing ring are in contact with the oil seal module and the sealing core module, respectively.

[0020] In some optional embodiments, the sealing core module has an end face facing the oil seal module, and the end face is provided with a limiting ring groove. The sealing ring is embedded in the limiting ring groove and protrudes relative to the end face to abut against the oil seal module.

[0021] In some optional embodiments, the sealing ring includes a first sealing surface and a second sealing surface that are opposite to each other. The first sealing surface contacts the oil seal module, and the second sealing surface contacts the sealing core module. At least one of the first sealing surface and the second sealing surface is provided with a protruding ring for pressing and sealing.

[0022] Secondly, embodiments of this application also provide a drum evaporator, including an evaporation cylinder, a support shaft, and a rotating shaft device of any one of the above, wherein the support shaft and the rotating shaft device are respectively disposed at opposite ends of the evaporation cylinder.

[0023] In some optional embodiments, the central shaft is provided with a mounting through hole that extends along the axial direction of the central shaft; the drum evaporator also includes a refrigerant pipe that passes through the mounting through hole and communicates with the internal space of the evaporator drum, and the refrigerant pipe is sealed to the central shaft.

[0024] In some optional embodiments, the refrigerant pipeline includes an inlet pipe and a return pipe. The inner diameter of the return pipe is larger than the outer diameter of the inlet pipe. The return pipe passes through the mounting through hole, and the outer peripheral wall of the return pipe is welded to the central shaft. The inlet pipe passes through the interior of the return pipe and extends into the evaporator.

[0025] In some optional embodiments, the air intake pipe includes a through pipe section, a connecting pipe section, and a delivery pipe section connected in sequence. The through pipe section is located inside the return air pipe, and the delivery pipe section is located outside the return air pipe. The return air pipe is provided with a through hole, and the connecting pipe section passes through the through hole. The connecting pipe section and the return air pipe are welded together.

[0026] In some optional embodiments, the evaporator includes a peripheral wall, a first end cap, and a second end cap. The peripheral wall is arranged around the evaporator to define the inner cavity of the evaporator. The second end cap closes one end of the inner cavity. A support shaft is connected to the second end cap. The first end cap is located on the end of the peripheral wall away from the second end cap. The first end cap has a connecting hole that communicates with the inner cavity. A rotating shaft device is connected to the first end cap and is coaxially arranged with the connecting hole.

[0027] In some optional embodiments, a limiting groove is provided on the side of the first end cover away from the inner cavity, the end of the bushing is embedded in the limiting groove, and the bushing is welded to the first end cover.

[0028] Thirdly, embodiments of this application also provide an ice-making device, including a refrigeration system and a drum evaporator as described above, wherein the refrigeration system is connected to the evaporation drum.

[0029] Compared to existing technologies, the ice-making equipment provided in this application embodiment rotatably installs the drum evaporator inside the ice-making equipment via a rotating shaft device. The rotating shaft device includes a central shaft and a bushing. The bushing is fixedly connected to the evaporator cylinder and sleeved on the outer periphery of the central shaft. An oil seal module is disposed between the central shaft and the bushing. While providing a sealing oil ring seal, the oil seal module can further achieve a seal by utilizing the characteristics of lubricating oil. Its sealing effect is better than that of the sealing ring in the traditional hole-shaft fit, and it can effectively prevent refrigerant leakage in the evaporator cylinder.

[0030] In addition, the rotating shaft assembly is equipped with a sealing core module, which is positioned between the bushing and the central shaft, and abuts against the inner wall of the bushing and the outer wall of the central shaft, respectively, achieving a reliable seal between the bushing and the central shaft. Since the sealing core module and the oil seal module are arranged side-by-side along the axial direction of the central shaft, at least two sealing structures are provided in this direction, further effectively preventing refrigerant leakage from the axial installation gap of the central shaft.

[0031] Furthermore, the rotating shaft device provided in this application embodiment is configured with a bushing and a central shaft to achieve a rotational fit. The rotating shaft device and the support shaft respectively realize rotatable support structures at both ends of the evaporating cylinder. For example, the bushing and the evaporating cylinder are relatively statically fixedly connected (for example, the bushing and the evaporating cylinder can be welded or glued together). During assembly or processing, it is only necessary to ensure the hole-shaft fit relationship between the bushing and the central shaft, without the need to additionally process assembly holes on the evaporating cylinder to adapt to the central shaft. The difficulty of processing and assembly is greatly reduced, which can effectively reduce the overall manufacturing cost of ice-making equipment. Attached Figure Description

[0032] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a three-dimensional structural diagram of an ice-making device provided in an embodiment of this application.

[0034] Figure 2 yes Figure 1 The diagram shows the structure of the ice-making equipment with the outer casing omitted.

[0035] Figure 3 yes Figure 2 A schematic diagram of the ice-making equipment from another perspective.

[0036] Figure 4 yes Figure 3 An enlarged schematic diagram of a portion of the ice-making equipment shown.

[0037] Figure 5 yes Figure 4 A schematic cross-sectional view of the ice-making equipment along line VV.

[0038] Figure 6 yes Figure 5 An enlarged schematic diagram of a portion of the drum evaporator of the ice-making equipment shown.

[0039] Figure 7 yes Figure 6 A partially enlarged schematic diagram of a portion of the structure of the drum evaporator shown.

[0040] Figure 8 yes Figure 7 A partially enlarged schematic diagram of another part of the structure of the drum evaporator shown.

[0041] Figure 9 yes Figure 7 A partially enlarged schematic diagram of another part of the structure of the drum evaporator shown.

[0042] Figure 10 yes Figure 7 The diagram shows an exploded three-dimensional view of the drum evaporator. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] It should be noted that when a component / part is said to be "fixed to" another component / part, it can be directly on the other component / part or there may be an intermediate component / part. When a component / part is considered to be "connected to" another component / part, it can be directly connected to the other component / part or there may be an intermediate component / part present; also, when a component / part is considered to be "connected to" another component / part, it can be integrally formed or assembled with the other component / part. When a component / part is considered to be "set on" another component / part, it can be directly set on the other component / part or there may be an intermediate component / part present.

[0045] 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 this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] Please see Figure 1 and Figure 2 This application provides a rotating shaft device 100 and a drum evaporator 200 equipped with the rotating shaft device 100. The drum evaporator 200 can be applied to ice makers such as ice-making equipment.

[0047] This application also provides an ice-making device 1000 equipped with the aforementioned rotating shaft device 100 and drum evaporator 200. The ice-making device 1000 is used to rapidly cool liquid water to form products such as ice cubes, shaved ice, or shaved ice. The ice-making device 1000 can be used as industrial equipment in production operations, or as food processing equipment to produce food ice cubes, shaved ice, or shaved ice. The ice-making device 1000 can also be applied in fields such as medical treatment, cold chain transportation, and entertainment (e.g., as a snow machine). This embodiment does not impose specific limitations in these areas. As an example, the ice-making device 1000 can be used as a household appliance, installed in offices, kitchens, restaurants, etc., to produce food shaved ice. When used for ice making, the ice-making device 1000 can be installed inside refrigerators, freezers, or other similar equipment, or it can be used independently.

[0048] Please see Figure 2In one embodiment provided in this application, the ice-making equipment 1000 includes a refrigeration system 1010 and a drum evaporator 200. The refrigeration system 1010 is used to deliver refrigerant to the drum evaporator 200 to cool the drum evaporator 200.

[0049] Please also refer to Figure 2 and Figure 3 The refrigeration system 1010 may include a compressor 1011, a condenser 1013 and a refrigerant delivery pipe 1015. The compressor 1011, the condenser 1013 and the drum evaporator 200 are connected in series through the refrigerant delivery pipe 1015 to form a refrigeration circuit. The refrigerant delivery pipe 1015 delivers refrigerant into the drum evaporator 200 to cool liquid water to form solid water. Specifically, compressor 1011 is used to compress refrigerant into a high-temperature, high-pressure liquid. The high-temperature, high-pressure liquid refrigerant is cooled by condenser 1013 and then transported to drum evaporator 200. The refrigerant in drum evaporator 200 absorbs heat from ice box 34 and changes from liquid to gas to cool external liquid water. The gaseous refrigerant then flows back to compressor 1011 through refrigerant delivery pipe 1015. After passing through compressor 1011 and condenser 1013, it changes back to liquid refrigerant. The liquid refrigerant returns to drum evaporator 200 to continue absorbing heat and cooling. The above process is repeated continuously to achieve the cooling of liquid water, thereby freezing the liquid water to form shaved ice.

[0050] Please see Figure 4 The drum evaporator 200 includes an evaporating cylinder 201, a support shaft 203, and the aforementioned rotating shaft device 100. The support shaft 203 and the rotating shaft device 100 are respectively disposed at opposite ends of the evaporating cylinder 201. The support shaft 203 and the rotating shaft device 100 can be substantially coaxially arranged and rotatably disposed inside the ice-making equipment 1000 to support the rotation of the evaporating cylinder 201. The interior of the evaporating cylinder 201 is connected to the refrigerant delivery pipe 1015. When the refrigerant delivery pipe 1015 delivers refrigerant into the evaporating cylinder 201, the temperature of the evaporating cylinder 201 can be lowered, thereby causing the liquid water adhering to the outer surface of the evaporating cylinder 201 to freeze into ice.

[0051] Please see Figure 5The rotating shaft device 100 includes a central shaft 10, a bushing 20, an oil seal module 30, and a sealing core module 40. The central shaft 10 has an axial direction O and is fixedly installed inside the ice-making equipment 1000. The bushing 20 is sleeved on the outer periphery of the central shaft 10, with its inner wall and the outer wall of the central shaft 10 spaced apart. The oil seal module 30 is sleeved outside the central shaft 10 and located between the central shaft 10 and the bushing 20. The sealing core module 40 is sleeved outside the central shaft 10 and located between the central shaft 10 and the bushing 20. The sealing core module 40 and the oil seal module 30 are arranged side by side along the axial direction O of the central shaft 10. The sealing core module 40 abuts against the inner wall of the bushing 20 and the outer wall of the central shaft 10, respectively. Therefore, the sealing core module 40 can achieve a reliable seal between the two ends of the central shaft 10. For example, gas or liquid at one end of the central shaft 10 cannot escape to the other end of the central shaft 10 through the gap between the central shaft 10 and the bushing 20. Furthermore, the oil seal module 30, arranged side by side with the sealing core module 40, can improve the reliability of the seal between the central shaft 10 and the bushing 20. While providing a sealing oil ring seal, the oil seal module 30 can further achieve a seal by utilizing the characteristics of lubricating oil. Its sealing effect is better than that of the sealing ring in the traditional hole-shaft fit. Therefore, the central shaft 10 has at least two sealing structures along the axial direction O, which further effectively prevents liquid or gas at the end of the central shaft 10 from leaking from the axial installation gap of the central shaft 10.

[0052] In specific application scenarios, when the rotating shaft device 100 is connected to the evaporator 201, it can be connected through the bushing 20 or through the central shaft 10.

[0053] As an example, one end of the bushing 20 is fixedly connected to one end face of the evaporator cylinder 201, and the support shaft 203 is fixedly connected to the other end face of the evaporator cylinder 201. The central shaft 10 is rotatably inserted through the bushing 20, allowing relative rotation between the central shaft 10 and the bushing 20. Simultaneously, the central shaft 10 is fixedly installed inside the ice-making device 100, and the support shaft 203 is rotatably installed inside the ice-making device 100. This allows the evaporator cylinder 201 to rotate based on the central shaft 10, the bushing 20, and the support shaft 203. Specifically, the bushing 20 or the support shaft 203 is connected to a rotary drive mechanism. Under the drive of the rotary drive mechanism, the bushing 20 or the support shaft 203 rotates, thereby causing the evaporator cylinder 201 to rotate, while the central shaft 10 remains stationary. In this example, the refrigerant delivery pipe 1015 can deliver refrigerant into the evaporator 201 via a channel within the central shaft 10 or the support shaft 203, or via a channel opened on the evaporator 201 itself.

[0054] As another example, the central shaft 10 is relatively fixedly connected to one end face of the evaporator cylinder 201, and the support shaft 203 is relatively fixedly connected to the other end face of the evaporator cylinder 201. The bushing 20 is rotatably fitted around the outer periphery of the central shaft 10, allowing relative rotation between the central shaft 10 and the bushing 20. Simultaneously, the bushing 20 is fixedly installed inside the ice-making device 100, and the support shaft 203 is rotatably installed inside the ice-making device 100. This allows the evaporator cylinder 201 to rotate based on the central shaft 10, the bushing 20, and the support shaft 203. Specifically, the central shaft 10 or the support shaft 203 is connected to a rotary drive mechanism. Under the drive of the rotary drive mechanism, the central shaft 10 or the support shaft 203 rotates, thereby driving the evaporator cylinder 201 to rotate, while the bushing 20 remains stationary. In this example, the refrigerant delivery pipe 1015 can deliver refrigerant into the evaporator 201 via a channel within the bushing 20 or the support shaft 203, or via a channel opened on the evaporator 201 itself.

[0055] Therefore, the rotating shaft device 100 provided in this application embodiment is configured with a bushing 20 and a central shaft 10 to achieve a rotational fit. The rotating shaft device 100 and the support shaft 203 respectively provide rotatable support structures at both ends of the evaporating cylinder 201. For example, the bushing 20 and the evaporating cylinder 201 are relatively statically fixedly connected (for example, the bushing 20 and the evaporating cylinder 201 can be welded or glued). During assembly or processing, it is only necessary to ensure the hole-shaft fit relationship between the bushing 20 and the central shaft 10, without the need to additionally process assembly holes on the evaporating cylinder 201 to fit the central shaft 10. The difficulty of processing and assembly is greatly reduced, which can effectively reduce the overall manufacturing cost of the ice-making equipment 100.

[0056] The following sections will introduce each component of the ice-making equipment 1000, the drum evaporator 200, and the rotating shaft device 100, as well as the specific structure of each component.

[0057] Please refer to it again. Figure 1 and Figure 2 In this embodiment of the application, the ice-making device 1000 may further include a housing assembly 1030, which is used to install components such as the refrigeration system 1010 and the drum evaporator 200.

[0058] The housing assembly 1030 includes a housing 1031, which is used to mount and protect components. The housing 1031 also supports the ice-making equipment 1000 in its place of use, such as on the ground, a table, or other support platform. Specifically, the housing 1031 is generally rectangular; in other embodiments, it can be any shape, such as a cube, cylinder, or even an irregular shape. The housing 1031 has an internal space (not shown in the figure) for mounting and placing components. These components may include the aforementioned rotating shaft device 100 and refrigeration system 1010, facilitating modular integration of the ice-making equipment 1000. For example, when the ice-making equipment 1000 is used in large freezers or beverage machines, the modular structure allows for direct embedding into these large freezers or beverage machines, making assembly easier.

[0059] Figure 3 This is a schematic diagram of an ice-making device 1000 according to an embodiment of this application, omitting the outer casing 1031. In this embodiment, the casing assembly 1030 further includes an inner casing 1033 and a mounting plate 1035. The mounting plate 1035 is disposed inside the outer casing 1031. Normally (e.g., in the operating state of the ice-making device 1000), the mounting plate 1035 is placed horizontally and is used to mount the electrical components of the ice-making device 1000, such as circuit boards, some components of the aforementioned drum evaporator 200, etc. The inner casing 1033 is disposed inside the outer casing 1031 and is fixedly mounted on the mounting plate 1035. The inner casing 1033 has a bottom wall and can be a generally semi-enclosed structure for holding ice-making raw materials such as liquid water.

[0060] In some embodiments, the ice-making device 1000 may further include a feed cylinder 1037, which is disposed in the inner shell 1033 for feeding ice-making raw materials (such as liquid water). The feed cylinder 1037 has a feed channel (not shown in the figure) inside, one end of which is located at the bottom wall of the inner shell 1033, and the other end extends outside the outer shell 1031, so that the user can feed ice-making raw materials through the feed channel.

[0061] In this embodiment, a drum evaporator 200 is disposed within an inner shell 1033 to convert liquid water in the inner shell 1033 into ice. Specifically, the inner shell 1033 has two opposing side walls (not shown in the figure), and the rotating shaft device 100 and the support shaft 203 of the drum evaporator 200 are respectively mounted on the two side walls, so that the evaporator cylinder 201 is located between the two side walls and can contact the liquid water contained in the inner shell 1033. When refrigerant is introduced into the evaporator cylinder 201, the overall temperature of the evaporator cylinder 201 drops, causing the water on its surface to freeze into ice; furthermore, when the evaporator cylinder 201 rotates, the ice layer on its surface continuously adheres to liquid water, and the liquid water continues to freeze into ice.

[0062] Please see Figure 4 To transport the ice formed on the evaporator 201 to the outside, the ice-making equipment 1000 may further include a scraper 1039. The inner shell 1033 has a discharge port communicating with the outside, located adjacent to the drum evaporator 200. Under normal conditions (e.g., operating state), the discharge port faces downwards in the direction of gravity. The scraper 1039 is disposed within the inner shell 1033, located between the drum evaporator 200 and the discharge port. The blade of the scraper 1039 faces the evaporator 201, and there is a certain gap between it and the evaporator 201. When the thickness of the ice layer on the evaporator 201 is greater than the width of this gap, the evaporator 201 continues to rotate, causing the ice layer to scrape against the blade of the scraper 1039, thus falling through the discharge port to become shaved ice or shaved ice product.

[0063] Please see Figure 5 In this embodiment, the evaporator 201 includes a peripheral wall 2011, a first end cap 2013, and a second end cap 2015. The peripheral wall 2011 surrounds and defines the inner cavity 2012 of the evaporator 201, and the peripheral wall 2011 can be generally cylindrical. The first end cap 2013 and the second end cap 2015 are respectively disposed at both ends of the peripheral wall 2011, wherein the second end cap 2015 closes one end of the inner cavity 2012 to prevent refrigerant leakage in the inner cavity 2012. The joint between the second end cap 2015 and the peripheral wall 2011 is welded to ensure reliable airtightness. A support shaft 203 is connected to the second end cap 2015 and mounts the evaporator 201 as a whole on one side wall of the inner shell 1033. A positioning groove (not shown in the figure) can be provided on the side of the second end cap 2015 facing away from the inner cavity 2012, and the end of the support shaft 203 is embedded in the positioning groove to facilitate assembly positioning. In this embodiment, one end of the support shaft 203 is fixedly connected to the second end cover 2015, and the other end is rotatably mounted on the side wall of the inner shell 1033. The joint between the second end cover 2015 and the support shaft 203 can be welded to ensure that the structure is firm and reliable.

[0064] Furthermore, in this embodiment, in order to drive the evaporator cylinder 201 to rotate, the ice-making equipment 1000 may also include a drive device 300. The drive device 300 is installed in the inner shell 1033 and is connected to the support shaft 203 for driving the support shaft 203 to rotate. Specifically, the drive device 300 may include a rotary motor and a reducer, with the reducer connected between the support shaft 203 and the rotary motor.

[0065] Please also refer to Figure 6 and Figure 7A first end cap 2013 is disposed on the end of the peripheral wall 2011 away from the second end cap 2015. The first end cap 2013 has a connecting hole 2014 that connects to the inner cavity 2012. The connecting hole 2014 is arranged along the axial direction O and is used to allow the refrigerant of the refrigeration system 1010 to flow into the inner cavity 2012. The joint between the first end cap 2013 and the peripheral wall 2011 is welded to ensure airtight reliability. A rotating shaft device 100 is connected to the first end cap 2013 and is coaxially arranged with the connecting hole 2014. In this embodiment, the bushing 20 of the rotating shaft device 100 is fixedly connected to the first end cap 2013, and the central shaft 10 is rotatably engaged with the bushing 20 and fixedly installed on the side wall of the inner shell 1033, so that the bushing 20 and the evaporator 201 can rotate and stop synchronously. Furthermore, the first end cap 2013 has a limiting groove 2016 on the side opposite to the inner cavity 2012, and the end of the bushing 20 is embedded in the limiting groove 2016 to facilitate assembly and positioning. In this embodiment, the limiting groove 2016 can surround the outer periphery of the connecting hole 2014. After the bushing 20 is installed, it also surrounds the outer periphery of the connecting hole 2014. The bushing 20 is welded to the first end cap 2012 to ensure that the joint of the end cap 2012 is airtight and reliable, thereby preventing the refrigerant from escaping through the connecting hole 2014.

[0066] In this embodiment, the bushing 20 is generally cylindrical and hollow, used to mount components such as the central shaft 10, oil seal module 30, and sealing core module 40. The central shaft 10 is rotatably mounted on the bushing 20 and aligned with the communicating hole 2014 on the first end cover 2013. In this embodiment, to support the rotational fit between the central shaft 10 and the bushing 20, the rotating shaft device 100 may further include a bearing 60, which is sleeved outside the central shaft 10 and located between the central shaft 10 and the bushing 20, allowing the bushing 20 to rotate relative to the central shaft 10 based on the bearing 60.

[0067] The bushing 20 is a one-piece molded structure; for example, it can be formed as a single casting. Please refer to [link / reference]. Figure 8 The bushing 20 includes a first sleeve portion 22 and a second sleeve portion 24 connected in sequence. One end of the first sleeve portion 22 is connected to the first end cap 2013, and the second sleeve portion 24 is connected to the end of the first sleeve portion 22 away from the first end cap 2013.

[0068] The first sleeve portion 22 is used to install the oil seal module 30 and the sealing core module 40. The inner diameter of the first sleeve portion 22 is smaller than the inner diameter of the second sleeve portion 24, forming a stepped surface 28 between the first sleeve portion 22 and the second sleeve portion 24. The bearing 60 is disposed inside the second sleeve portion 24, thus the bearing 60, the oil seal module 30, and the sealing core module 40 are arranged in a parallel structural relationship in the axial direction O. The bearing 60 is stacked on the stepped surface 28, which serves to form a limiting structure for the bearing 60 and also prevents excessive compression that could damage the inner parts when the bearing 60 is pressed towards the evaporator cylinder 201.

[0069] In this embodiment, to form a limiting structure for the other end of the bearing 60, the rotating shaft device 100 may further include an outer end cover 70. The outer end cover 70 is disposed inside the bushing 20 and located on the side of the bearing 60 away from the oil seal module 30. In this embodiment, the outer end cover 70 is also sleeved outside the central shaft 10 and abuts against the bearing 60. Therefore, the outer end cover 70 and the stepped surface 28 respectively form axial limiting for both ends of the bearing 60, making the installation structure of the bearing 60 more stable and preventing axial movement during rotation. Furthermore, there is a clearance fit between the outer end cover 70 and the central shaft 10, and an anti-rotation connection between the outer end cover 70 and the bushing 20. That is, the outer end cover 70 and the bushing 20 are relatively fixedly connected, and the two can rotate and stop synchronously. Therefore, when the evaporator 201 rotates, the bushing 20 and the outer end cover 70 can rotate relative to the central shaft 10. It should be understood that, in this specification, the "anti-rotation connection" between component A and component B should be interpreted as follows: there is a connection between A and B, but relative rotation between A and B is prohibited. A and B are relatively fixed; A can rotate with B and stop when B stops. The connection between A and B can be achieved through various structures, such as plug-in connections with non-circular holes, key connections, threaded connections, etc.

[0070] Specifically Figure 8 In the illustrated embodiment, the bushing 20 further includes a third sleeve portion 26, which is coaxially arranged with the first sleeve portion 22 and the second sleeve portion 24, and is located at the end of the second sleeve portion 24 away from the first sleeve portion 22. An outer end cap 70 is disposed in the third sleeve portion 26, thus the outer end cap 70 can close one end of the bushing 20. The inner wall of the third sleeve portion 26 is provided with internal threads, and the outer end cap 70 is provided with external threads. The outer end cap 70 is connected to the internal threads via the external threads to achieve a non-rotational connection between the outer end cap 70 and the bushing 20. Therefore, the bushing 20 provided in this embodiment has a relatively simple structure. During the manufacturing process, only the stepped surface and internal threads need to be machined to achieve a rotational sealing fit with the central shaft 10 through the sealing core module 40 and the oil seal module 30, without the need for additional machining of sealing ring grooves, multi-stage shoulders, or stepped structures in related technologies, which can significantly reduce manufacturing costs.

[0071] Furthermore, the rotating shaft device 100 also includes a retaining ring 80, which is held between the outer end cover 70 and the central shaft 10 to limit the axial movement of the bearing 60 and the outer end cover 70. Specifically, the outer end cover 70 has a first retaining ring groove 72 on the side facing the central shaft 10, and the central shaft 10 has a second retaining ring groove 12. The second retaining ring groove 12 and the first retaining ring groove 72 are correspondingly arranged and communicate with each other. The retaining ring 80 is accommodated in the first retaining ring groove 72 and the second retaining ring groove 12. The retaining ring 80 is actually an open metal ring with an opening, and its annular structure does not extend completely on the same plane. The two ends of the opening of the retaining ring 80 are not completely opposite but staggered when not under stress. The first retaining ring groove 72 is located on the end face of the outer end cover 70 facing the bearing 60. When the retaining ring 80 is accommodated in the first retaining ring groove 72 and the second retaining ring groove 12, one side of the retaining ring 80 contacts the bearing 60, and the other side contacts the bottom of the first retaining ring groove 72 and the second retaining ring groove 12. When the threaded connection structure of the outer end cover 70 is tightened, the outer end cover 70 can push the retaining ring 80 to deform along the axial direction O and tightly abut against the bearing 60, thus limiting the bearing 60. At the same time, due to the reaction force of the retaining ring 80, it generates a thrust on the threaded connection structure of the outer end cover 70, thereby playing a pre-tightening role and preventing the threaded connection structure of the outer end cover 70 from loosening.

[0072] Please refer to it again. Figure 7 The oil seal module 30 is disposed on the first sleeve portion 22 and located on the side of the bearing 60 opposite to the outer end cover 70. The oil seal module 30 includes an oil seal bracket 32 ​​and an oil seal ring 34. The oil seal bracket 32 ​​is sleeved on the outer periphery of the central shaft 10 and is interference-fitted with the bushing 20. The oil seal ring 34 is disposed between the oil seal bracket 32 ​​and the central shaft 10.

[0073] In this embodiment, the oil seal bracket 32 ​​is made of a rigid material, such as a ring structure made of steel. The oil seal bracket 32 ​​is generally ring-shaped, and when it is fitted around the outer periphery of the central shaft 10, its inner wall and the central shaft 10 are in clearance fit, forming a rotational fit structure with the central shaft 10. The oil seal bracket 32 ​​has a receiving groove 321 on the side facing the central shaft 10, and the oil seal ring 34 is partially embedded in the receiving groove 321 and abuts against the central shaft 10. For example, the outer periphery of the oil seal ring 34 is embedded in the receiving groove 321, and the inner periphery of the oil seal ring 34 protrudes relative to the opening of the receiving groove 321 and abuts against the central shaft 10, so that the oil seal ring 34 is essentially squeezed between the bottom of the receiving groove 321 and the central shaft 10. The oil seal ring 34 can be made of an elastic material, such as a rubber ring or a silicone ring, thus ensuring the rotational fit between the oil seal module 30 and the central shaft 10. The oil seal ring 34 has an oil reservoir (not shown in the figure) on the side facing the central shaft 10 for storing lubricating oil. The oil reservoir stores lubricating oil to reduce the frictional force when the central shaft 10 rotates relative to the oil seal module 30. Furthermore, the portion of the oil seal ring 34 located within the receiving groove 321 can also be provided with other oil reservoirs. For example, at least a portion of the structure of the oil seal ring 34 and the bottom wall or inner wall of the receiving groove 321 are spaced apart, and the space can be used to hold lubricating oil. This ensures that more lubricating oil is available to improve the lubrication effect, and also serves as a channel for the flow and cooling of lubricating oil, preventing the oil seal ring 34 from failing at high temperatures.

[0074] The sealing core module 40 is located on the side of the oil seal module 30 away from the bearing 60, that is, at the end of the entire rotating shaft assembly 100 facing the evaporator cylinder 201. When the rotating shaft assembly 100 is installed on the evaporator cylinder 201, the central shaft 10 and the connecting hole 2014 are coaxial. The sealing core module 40 is sleeved on the outer periphery of the central shaft 10 and stacked on the first end cap 2013, and surrounds the connecting hole 2014. Therefore, if gas or liquid escapes from the inner cavity 2012 of the evaporator cylinder 201 through the connecting hole 2014, it will be blocked by the sealing core module 40. If gas or liquid breaks through the sealing structure of the sealing core module 40 under high pressure, it will also be blocked by the oil seal module 30. After being blocked by the sealing core module 40, the pressure of the relatively high-pressure gas or liquid is greatly reduced, and the pressure when it reaches the oil seal module 30 is basically difficult to break through the sealing structure of the oil seal module 30, so it can basically not escape outward. Therefore, in this embodiment, two sealing structures are provided in the axial direction O, making the sealing effect of the rotating shaft device 100 more reliable.

[0075] The sealing core module 40 includes a sealing bracket 42, a first sealing ring 44, and a second sealing ring 46. The sealing bracket 42 is sleeved around the central shaft 10 and located between the central shaft 10 and the bushing 20. The first sealing ring 42 is disposed between the bushing 20 and the sealing bracket 42, and the second sealing ring 46 is disposed between the sealing bracket 42 and the central shaft 10. The sealing bracket 42 can be made of rigid or elastic materials, such as a steel ring structure or a rubber ring structure. The first sealing ring 44 and the second sealing ring 46 are made of elastic materials, such as rubber rings or silicone rings. The first sealing ring 44 is clamped between the bushing 20 and the sealing bracket 42 to form the outer ring sealing structure of the sealing core module 40, and the second sealing ring 46 is clamped between the sealing bracket 42 and the central shaft 10 to form the inner ring sealing structure of the sealing core module 40. By setting the inner and outer ring sealing structures, a reliable seal between the bushing 20 and the central shaft 10 can be achieved, thereby effectively preventing the refrigerant from leaking from the axial installation gap of the central shaft 10.

[0076] Furthermore, the sealing bracket 42 and the bushing 20 are connected in an anti-rotation manner. For example, they can be connected by cold pressing to form an interference fit in a hole-shaft fit, or they can be connected by a key, so that they can rotate and stop synchronously to achieve an anti-rotation connection structure. The sealing bracket 42 has an outer peripheral wall facing the bushing 20, and the outer peripheral wall is provided with a first groove 421. The first sealing ring 44 is disposed in the first groove 421 and abuts against the bushing 20. The first groove 421 limits the first sealing ring 44, thus achieving a reliable seal between the sealing bracket 42 and the bushing 20. In order to ensure a better sealing effect, the number of first sealing rings 44 can be one or more, for example, two or more. Multiple first sealing rings 44 can be arranged side by side along the axial direction O, and each first sealing ring 44 is clamped between the sealing bracket 42 and the bushing 20. Correspondingly, the number of first grooves 421 can also be one or more, for example, two or more, with multiple first grooves 421 and multiple first sealing rings 44 arranged in a one-to-one correspondence.

[0077] In some embodiments, an adhesive may be provided between the outer peripheral wall of the sealing bracket 42 and the bushing 20. The adhesive enhances the reliability of the connection between the sealing bracket 42 and the bushing 20. Simultaneously, the adhesive is arranged around the outer periphery of the sealing bracket 42, providing a sealing effect while strengthening the connection, further improving the sealing performance. In some embodiments, an adhesive may also be provided between the first sealing ring 44 and the bushing 20. Here, the adhesive is used to fix the first sealing ring 44, preventing it from dislodging under vibration. Simultaneously, the adhesive is arranged around the outer periphery of the first sealing ring 44, providing a sealing effect while strengthening the connection, further improving the sealing performance. The aforementioned adhesive can be an anaerobic adhesive, suitable for bonding metal and rubber. After curing, it forms a tough sealing layer that is resistant to oil corrosion and can withstand high pressure without failure. The adhesive mentioned above can also be epoxy resin. Since the bushing 20 and the sealing bracket 42 are relatively stationary, the sealing state between them is a static seal. Epoxy resin itself has the function of a sealant, which can have strong adhesion while ensuring the reliability of the static seal, and the cost is relatively low.

[0078] In this embodiment, the sealing bracket 42 has an inner peripheral wall facing the central shaft 10, which is spaced apart from the central shaft 10. For example, the inner peripheral wall and the central shaft 10 are in a clearance fit relationship, allowing them to rotate relative to each other. The inner peripheral wall is provided with a second groove 423, and the second sealing ring 46 is disposed in the second groove 423 and abuts against the central shaft 10. The second groove 423 limits the second sealing ring 46, enabling a reliable seal between the sealing bracket 42 and the central shaft 10. In this embodiment, the sealing core module 40 positions the first sealing ring 44 and the second sealing ring 46 through the groove structure on the sealing bracket 42, which is equivalent to an integrated sealing module, realizing the integrated modularization of the sealing element and making installation easier. To ensure a better sealing effect, the number of second sealing rings 46 can be one or more, for example, two or more. Multiple second sealing rings 46 can be arranged side by side along the axial direction O, with each second sealing ring 46 being clamped between the sealing bracket 42 and the central shaft 10. Correspondingly, the number of second grooves 423 can also be one or more, for example, the number can be two or more, and multiple second grooves 423 and multiple second sealing rings 46 are set one-to-one.

[0079] In the embodiments of the application, the structures of the first sealing ring 44 and the second sealing ring 46 may be the same or different. For example, the first sealing ring 44 may be an O-ring, a V-ring, or a star-shaped ring, etc., and the second sealing ring 46 may also be an O-ring, a V-ring, or a star-shaped ring, etc. Specifically... Figure 7In the illustrated embodiment, the first sealing ring 44 is an O-ring, and the second sealing ring 46 is a star-shaped ring; both can be rubber rings or fluororubber rings. The second sealing ring 46 has multiple raised ribs 461 on the side facing the central shaft 10. These raised ribs 461 are spaced apart sequentially along the axial direction O of the central shaft 10 and abut against the central shaft 10. By providing the raised ribs 461, the second sealing ring 46 can have a larger deformation at this location. When the second sealing ring 46 is pressed together by the central shaft 10 and the sealing bracket 42, the raised ribs 461 can undergo significant deformation, resulting in a relatively large contact area with the central shaft 10, thus ensuring a better sealing effect. Furthermore, if there are a few irregular protrusions on the central shaft 10 (e.g., defects caused by processing errors), the raised ribs 461 with a larger deformation can still wrap around these protrusions and maintain close contact with the surface of the central shaft 10 during rotation, thereby further ensuring a more reliable sealing effect.

[0080] In some embodiments, the second sealing ring 46 has an oil reservoir 463 for storing lubricating oil on the side facing the central shaft 10. Therefore, in the actual application scenario of the sealing core module 40, the oil reservoir 463 is filled with lubricating oil, which can further achieve sealing by utilizing the properties of lubricating oil, and its sealing effect is better than that of the sealing ring in the traditional hole-shaft fit.

[0081] In some embodiments, the rotating shaft device 100 further includes a sealing ring 50, which is sleeved outside the central shaft 10 and located between the oil seal module 30 and the sealing core module 40. The two sides of the sealing ring 50 contact the sealing core module 40 and the oil seal module 30, respectively. In this embodiment, the outer diameter of the sealing ring 50 is smaller than the inner diameter of the bushing 20, and it is pressed between the sealing core module 40 and the oil seal module 30, thus achieving end-face sealing between the sealing core module 40 and the oil seal module 30. When leakage occurs in the sealing core module 40, the refrigerant in the inner cavity 2012 may escape along the axial direction O towards the oil seal module 30. Due to the presence of the sealing ring 50, the escape path of the refrigerant is blocked, further ensuring the reliability of the seal. As an example, the sealing ring 50 is made of an elastic material, such as a rubber ring or a silicone ring.

[0082] Furthermore, as an example, the sealing core module 40 has an end face (not shown) facing the oil seal module 30, which can be a surface of the sealing bracket 42. This end face is provided with a limiting ring groove 425, in which the sealing ring 50 is embedded and protrudes relative to the end face to abut against the oil seal module 20.

[0083] The sealing ring 50 may include a first sealing surface (not shown in the figure) and a second sealing surface (not shown in the figure) that are opposite to each other. The first sealing surface contacts the oil seal module 30, and the second sealing surface contacts the sealing core module 40. At least one of the first and second sealing surfaces is provided with a protruding ring 521 for pressing and sealing. As an example, the protruding ring 521 is provided on the first sealing surface, and the protruding ring 521 contacts the oil seal module 30. By providing the protruding ring 521, the sealing ring 50 can have a large deformation at this location. When the sealing ring 50 is pressed together by the oil seal bracket 32 ​​and the sealing bracket 42, the protruding ring 521 can produce a large deformation, and its contact surface with the oil seal bracket 32 ​​can also be relatively large, which can ensure a better sealing effect. As another example, the second sealing surface may also be provided with a protruding ring 521, and the protruding ring 521 contacts the sealing core module 40.

[0084] To allow refrigerant to be introduced into the evaporator 201, the central shaft 10 may be provided with a mounting through-hole 14, which communicates with the inner cavity 2012 of the evaporator 201. The mounting through-hole 14 can serve as a channel for refrigerant transfer; for example, it can be directly connected to the refrigerant delivery pipe 1015 of the refrigeration system 1010, allowing refrigerant in the delivery pipe 1015 to be introduced into the inner cavity 2012 via the mounting through-hole 14. Alternatively, the mounting through-hole 14 can be used to install other pipes, enabling these pipes to communicate with the inner cavity 2012 for refrigerant delivery.

[0085] Please see Figure 9 In this embodiment, the mounting through hole 14 extends along the axial direction O of the central shaft 10 and passes through both ends of the central shaft 10, thereby communicating with the inner cavity 2012 of the evaporator cylinder 201. Further, the drum evaporator 200 also includes a refrigerant pipe 205, which passes through the mounting through hole 14 and communicates with the internal space (i.e., the inner cavity 2012) of the evaporator cylinder 201. The refrigerant pipe 205 is sealed to the central shaft 10 to prevent refrigerant leakage. Since the refrigerant pipe 205 and the central shaft 10 are relatively stationary, the seal between them is a static seal. This sealing connection can be achieved through a sealing ring, or through a connection structure such as adhesive bonding or welding, all of which can ensure a good sealing effect.

[0086] In some embodiments, the refrigerant pipe 205 includes an inlet pipe 207 and a return pipe 209. The inlet pipe 207 is connected to both the inner cavity 2012 and the inlet portion of the refrigerant delivery pipe 1015. The refrigerant supplied from the condenser 1013 is input into the inner cavity 2012 via the inlet portion and the inlet pipe 207. The return pipe 209 is connected to both the inner cavity 2012 and the return portion of the refrigerant delivery pipe 1015. After the refrigerant evaporates into a gaseous state in the evaporator 201, the gaseous refrigerant returns to the compressor 1011 via the return pipe 209, the return portion, and the refrigerant delivery pipe 1015 to begin a new refrigeration cycle.

[0087] As a specific example, the inner diameter of the return pipe 209 is larger than the outer diameter of the inlet pipe 207. The return pipe 209 passes through the mounting through hole 14, thus connecting the refrigerant delivery pipe 1015 and the inner cavity 2012. The outer peripheral wall of the return pipe 209 is welded to the central shaft 10 to achieve a seal. For example, the gap between the outer peripheral wall of the return pipe 209 and the inner peripheral wall of the central shaft 10 is filled with solder 2091. The solder 2091 fuses the surface materials of the return pipe 209 and the surface materials of the central shaft 10, which can ensure both the stability of the connection and the airtightness, effectively preventing the refrigerant in the inner cavity 2012 from leaking out.

[0088] The outer diameter of the intake pipe 207 is much smaller than the inner diameter of the return pipe 209; for example, the ratio of their radial dimensions is less than or equal to 1:3. The intake pipe 207 passes through the interior of the return pipe 209 and extends into the evaporator 201. This allows the mounting through hole 14 to be reused, eliminating the need to create a dedicated channel for the intake pipe 207 on the central shaft 10 or the evaporator 201. This reduces the number of sealing points and the difficulty of sealing, and simplifies the structure, indirectly reducing costs.

[0089] In the embodiments of this application, please also refer to Figure 9 and Figure 10 The return pipe 209 has a through hole 2090, through which the intake pipe 207 passes. The outer peripheral wall of the intake pipe 207 and the return pipe 209 are welded together to achieve a seal. For example, the gap between the outer peripheral wall of the intake pipe 207 and the inner peripheral wall (the wall of the through hole 2090) of the return pipe 209 is filled with solder 2093. The solder 2093 melts and connects the surface materials of the intake pipe 207 and the return pipe 209, which can ensure both the stability of the connection and the airtightness, effectively preventing the refrigerant in the return pipe 209 from leaking out.

[0090] As an example, the return pipe 209 is generally bent, having a bent portion. For instance, the portion of the return pipe 209 outside the end of the central axis 10 has a bent structure, which can be a 90-degree rounded bend. A through hole 2090 is formed on this bent structure for ease of processing. The intake pipe 207 includes a through pipe section 2071, a connecting pipe section 2073, and a delivery pipe section 2075 connected in sequence. The through pipe section 2071 is located inside the return pipe 209 and can extend in a straight line. The through pipe section 2071 is located approximately at the center of the inner tube of the return pipe 209 and is spaced from the inner wall of the return pipe 209, resulting in a more uniform gap between the through pipe section 2071 and the return pipe 209, and relatively low noise during refrigerant flow. The delivery pipe section 2075 is located outside the return pipe 209 and connected to the refrigerant delivery pipe 1015. In this embodiment, the delivery pipe section 2075 extends in a straight line and is tightly attached to the outer wall of the return pipe 209. For example, it can be connected to the return pipe 209 by adhesive bonding or welding. The connecting pipe section 2073 passes through the through hole 2090 and is welded to the return pipe 209. Furthermore, the connecting pipe section 2073 is also bent, and it is roughly fitted to the bent structure of the return pipe 209 and passes through the bent structure of the return pipe 209, which facilitates the assembly of the intake pipe 207.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A rotating shaft device, characterized in that, include: Central axis; A bushing is fitted around the outer periphery of the central shaft, with the inner wall of the bushing and the outer wall of the central shaft spaced apart. An oil seal module, sleeved outside the central shaft and located between the central shaft and the bushing; and A sealing core module is sleeved outside the central shaft and located between the central shaft and the bushing; the sealing core module and the oil seal module are arranged side by side along the axial direction of the central shaft, and the sealing core module abuts against the inner wall of the bushing and the outer wall of the central shaft respectively.

2. The rotating shaft device as described in claim 1, characterized in that, The sealing core module includes: A sealing bracket is sleeved outside the central shaft and located between the central shaft and the bushing; A first sealing ring is disposed between the bushing and the sealing bracket; and The second sealing ring is disposed between the sealing bracket and the central shaft.

3. The rotating shaft device as described in claim 2, characterized in that, The sealing bracket is anti-rotationally connected to the bushing. The sealing bracket has an outer peripheral wall facing the bushing. The outer peripheral wall is provided with a first groove. The first sealing ring is disposed in the first groove and abuts against the bushing.

4. The rotating shaft device as described in claim 2, characterized in that, The sealing bracket has an inner peripheral wall facing the central axis, the inner peripheral wall being spaced apart from the central axis, the inner peripheral wall having a second groove, the second sealing ring being disposed in the second groove and abutting against the central axis, the second sealing ring having a plurality of raised rib rings on the side facing the central axis, the plurality of raised rib rings being arranged sequentially at intervals along the axial direction of the central axis and abutting against the central axis respectively, the second sealing ring having an oil reservoir for storing lubricating oil on the side facing the central axis.

5. The rotating shaft device as described in claim 1, characterized in that, The oil seal module includes an oil seal bracket and an oil seal ring. The oil seal bracket is sleeved on the outer periphery of the central shaft and is interference-fitted with the bushing. The oil seal ring is disposed between the oil seal bracket and the central shaft. The oil seal bracket has a receiving groove on the side facing the central shaft. The oil seal ring is partially embedded in the receiving groove and abuts against the central shaft. The oil seal ring has an oil storage groove on the side facing the central shaft for storing lubricating oil.

6. The rotating shaft device as described in claim 1, characterized in that, The rotating shaft device also includes a bearing and an outer end cap. The bearing is disposed between the central shaft and the bushing and is arranged in parallel with the oil seal module. The outer end cap is sleeved outside the central shaft and located on the side of the bearing away from the oil seal module. The outer end cap covers one end of the bushing.

7. The rotating shaft device as described in claim 6, characterized in that, The inner wall of the bushing is provided with an internal thread, and the outer end cover is provided with an external thread. The outer end cover is connected to the internal thread through the external thread. The rotating shaft device also includes a retaining ring. The outer end cover is provided with a first retaining ring groove on the side facing the central shaft, and the central shaft is provided with a second retaining ring groove. The retaining ring is accommodated in the first retaining ring groove and the second retaining ring groove.

8. The rotating shaft device according to any one of claims 1 to 7, characterized in that, The rotating shaft device also includes a sealing ring, which is sleeved on the outside of the central shaft and located between the oil seal module and the sealing core module; both sides of the sealing ring are in contact with the oil seal module and the sealing core module, respectively.

9. The rotating shaft device as described in claim 8, characterized in that, The sealing core module has an end face facing the oil seal module. The end face is provided with a limiting ring groove. The sealing ring is embedded in the limiting ring groove and protrudes relative to the end face to abut against the oil seal module. The sealing ring includes a first sealing surface and a second sealing surface that are opposite to each other. The first sealing surface contacts the oil seal module, and the second sealing surface contacts the sealing core module. At least one of the first sealing surface and the second sealing surface is provided with a protruding ring for pressing and sealing.

10. A drum evaporator, characterized in that, It includes an evaporator, a support shaft, and a rotating shaft device as described in any one of claims 1 to 9, wherein the support shaft and the rotating shaft device are respectively disposed at opposite ends of the evaporator.

11. The drum evaporator as claimed in claim 10, characterized in that, The central shaft is provided with a mounting through hole, which extends along the axial direction of the central shaft; the drum evaporator also includes a refrigerant pipe, which passes through the mounting through hole and communicates with the internal space of the evaporator drum. The refrigerant pipe is sealed to the central shaft. The refrigerant pipe includes an inlet pipe and a return pipe. The inner diameter of the return pipe is larger than the outer diameter of the inlet pipe. The return pipe passes through the mounting through hole, and its outer peripheral wall is welded to the central shaft. The inlet pipe passes through the interior of the return pipe and extends into the evaporator drum.

12. An ice-making device, characterized in that, include: Refrigeration system, and The drum evaporator according to any one of claims 10 to 11, wherein the refrigeration system is connected to the evaporation drum.

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