An ice maker system and a delivery pump thereof

Abstract

The application discloses an ice maker system and a delivery pump thereof, which comprises an ice making mechanism, a refrigeration mechanism and a water circulation mechanism; the water circulation mechanism comprises a circulation pipe, a first pipeline and a water pump; the circulation pipe is connected with the water pump through the first pipeline; the water pump is connected with a water inlet pipe through a pipeline; an ice delivery pipe is connected with an ice outlet pipe; the ice delivery pipe is connected with the water pump through a second pipeline; the water pump (20) comprises a volute (21), an impeller (22) and a pump shaft (23); a pump inlet pipe (24) is arranged at an inlet end of the volute; an adjusting mechanism (28) is arranged in the pump inlet pipe; the adjusting mechanism is arranged at an upstream end of the centrifugal impeller; and the adjusting mechanism plays a role of flow guiding and sealing. The application can improve the flow guiding and sealing effect of the centrifugal impeller inlet end, so as to reduce the turbulence and flow loss of the impeller inlet end, thereby ensuring the stability of the water pump output pressure and flow and improving the operation stability of the delivery pump.

Description

Technical Field

[0001] This invention relates to the field of ice maker technology, and more specifically to an ice maker system and its delivery pump. Background Technology

[0002] The existing ice-making system includes an ice-making mechanism, a refrigeration mechanism, and a water circulation mechanism. The ice-making mechanism includes a shell, an upper end cover, a lower end cover, a rotating shaft, and a spiral scraper. The upper and lower end covers are connected to both ends of the shell, respectively. The rotating shaft and spiral scraper are installed inside the shell. The shell includes an outer cylinder, a middle cylinder, and an inner cylinder arranged radially in sequence. The outer cylinder and the middle cylinder form a heat insulation cavity, and the middle cylinder and the inner cylinder form a refrigeration cavity. The inner cavity of the inner cylinder forms an ice-making cavity. The lower end of the shell is connected to a water inlet pipe and a refrigerant inlet pipe, which are connected to the ice-making cavity and the refrigerant inlet pipe, respectively. The upper end of the shell is connected to an ice outlet pipe and a refrigerant outlet pipe, which are connected to the ice-making cavity and the refrigerant outlet pipe, respectively. The refrigeration mechanism includes a compressor, a condenser, and an expansion valve. The water circulation mechanism includes a water pump, which is connected to the water inlet pipe via a pipeline. However, existing delivery pumps still suffer from poor flow guidance and sealing at the impeller inlet, and poor stability of pump output pressure / flow, which need to be further improved. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an ice maker system and its delivery pump. Through the design of the adjustment mechanism of the delivery pump, the flow guiding and sealing effect at the inlet end of the centrifugal impeller can be improved, thereby reducing turbulence and flow loss at the impeller inlet end, thus ensuring the stability of the pump output pressure and flow rate and improving the operational stability of the delivery pump.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An ice-making system includes an ice-making mechanism, a refrigeration mechanism, and a water circulation mechanism. The ice-making mechanism includes a housing (1), an upper end cover (2), a lower end cover (3), a rotating shaft (4), and a spiral scraper (5). The upper end cover and the lower end cover are respectively connected to both ends of the housing. The rotating shaft and the spiral scraper are installed inside the housing. The housing includes an outer cylinder (11), a middle cylinder (12), and an inner cylinder (13) arranged radially in sequence. The outer cylinder and the middle cylinder form a heat insulation cavity, the middle cylinder and the inner cylinder form a refrigeration cavity, and the inner cavity of the inner cylinder forms an ice-making cavity. A water inlet pipe (14) and a refrigerant inlet pipe (16) are connected to the lower end of the housing. The water inlet pipe is connected to the ice-making chamber, the refrigerant inlet pipe is connected to the refrigeration chamber, and the upper end of the shell is connected to the ice outlet pipe (15) and the refrigerant outlet pipe (17). The ice outlet pipe is connected to the ice-making chamber, and the refrigerant outlet pipe is connected to the refrigeration chamber. The refrigeration mechanism includes a compressor, a condenser, and an expansion valve. The water circulation mechanism includes a circulation pipe (18), a first pipeline (19), a water pump (20), and a second pipeline. The circulation pipe is set on the lower end cover. The circulation pipe is connected to the water pump through the first pipeline, and the water pump is connected to the water inlet pipe through the pipeline. An ice conveying pipe is connected to the ice outlet pipe. The ice conveying pipe is connected to the water pump through the second pipeline.

[0006] A delivery pump for an ice maker system, wherein the delivery pump is a water pump (20), the water pump (20) includes a volute (21), a centrifugal impeller (22), and a pump shaft (23). The centrifugal impeller is installed inside the volute and on the pump shaft. A pump inlet pipe (24) is provided at the inlet end of the volute. The centrifugal impeller includes a front plate (25), a rear plate (26), and blades (27). Multiple blades are distributed circumferentially and connected between the front plate and the rear plate. An adjustment mechanism (28) is installed inside the pump inlet pipe. The adjustment mechanism is located on the centrifugal impeller. At the upstream end of the wheel, the adjustment mechanism plays the role of guiding and sealing; the adjustment mechanism (28) includes an outer ring (281), an inner ring (282), and a first guide vane (283). The first guide vane is connected between the outer ring and the inner ring. Multiple first guide vanes are distributed circumferentially. The first guide vane is set opposite to the inlet ring of the front disc and a first sealing gap is formed between them. The outer ring is installed on the inner circumferential wall of the pump inlet pipe and is axially positioned by a positioning sleeve (29). The positioning sleeve is installed on the inner circumferential wall of the pump inlet pipe.

[0007] Furthermore, the adjustment mechanism (28) also includes a second guide vane (284), which is disposed on the inner peripheral wall of the inner ring. Multiple second guide vanes are distributed circumferentially. A second sealing gap is formed between the downstream end of the second guide vane and the inlet ring of the front disc (25). The first sealing gap extends radially and the second sealing gap extends axially.

[0008] Furthermore, the outer circumferential surface of the inlet ring of the front disc (25) is provided with a third guide vane (30), and multiple third guide vanes are distributed circumferentially. A third sealing gap is formed between the third guide vane and the inner circumferential surface of the pump inlet pipe (24) or the sealing ring of the inner circumferential surface. The third sealing gap extends axially. The third guide vane and the first guide vane (283) are arranged opposite each other in the axial direction. The third guide vane is formed in the form of a material removal groove.

[0009] Furthermore, the outer ring (281) has multiple positioning holes on its outer circumferential surface, which are distributed circumferentially. The pump inlet pipe (24) has one or more connecting holes, and a positioning connector (31) is sealed to the connecting holes. The adjustment mechanism (28) can rotate circumferentially to realize the positioning connector and different positioning holes for positioning and connection. The positioning connector (31) is used to realize the adjustment and positioning of the adjustment mechanism (28) in multiple positions in the circumferential direction, thereby realizing the preset correspondence between the first guide vane (283) and the third guide vane (30).

[0010] Furthermore, the first guide vane, the second guide vane, and the third guide vane are plate-shaped and their profiles are inclined relative to the rotation axis of the centrifugal impeller (22); or they are arc-shaped and their profiles are curved relative to the rotation axis of the centrifugal impeller.

[0011] Furthermore, the positioning sleeve (29) includes a cylindrical section (291) and a positioning platform stage (292). The downstream end of the cylindrical section abuts against the outer ring (281), and the upstream end is provided with a positioning platform stage, which is fitted into the positioning groove of the flange at the upstream end of the pump inlet pipe (24).

[0012] Furthermore, the second guide vane (284) has an axial length L, the first guide vane (283) has an axial length L3, the second guide vane and the third guide vane (30) have an axial overlap length L2, the first sealing gap has an axial length L1, and L1+L2+L3=L.

[0013] Furthermore, the axial lengths are L1 = (0.02-0.3)L, L2 = (0.15-0.45)L, and L3 = (0.4-0.7)L.

[0014] Furthermore, the first guide vane (283) has a radial width h, h = (0.15-0.45)L.

[0015] An ice-making machine system and its delivery pump according to the present invention have the following beneficial technical effects:

[0016] (1) The present invention can improve the flow guidance and sealing effect of the centrifugal impeller inlet by adjusting the mechanism, thereby reducing the turbulence and flow loss at the impeller inlet, thus ensuring the stability of the pump output pressure and flow rate and improving the operation stability of the pump.

[0017] (2) The present invention can rotate circumferentially through the adjustment mechanism to realize the positioning and connection of the positioning connector with different positioning holes, thereby realizing the preset correspondence between the first guide vane and the third guide vane; through the design of the specific structure and parameters / sizes of the adjustment mechanism (axial length L1, L2, L3, L, radial width h), the guiding and sealing effect of the centrifugal impeller inlet end can be further improved, thereby reducing the turbulence and flow loss at the impeller inlet end, thereby ensuring the stability of the pump output pressure and flow rate, and improving the operation stability of the delivery pump.

[0018] (3) Through the design of the water circulation mechanism, the present invention can realize the recycling of water in the ice-making mechanism, improve the flow state of the ice-water medium in the ice-making mechanism, and realize the recycling of water during the ice conveying process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the ice maker system of the present invention;

[0020] Figure 2 This is a schematic diagram of the delivery pump structure of the ice maker system of the present invention;

[0021] Figure 3 This is a partially enlarged schematic diagram of the delivery pump in the ice maker system of the present invention;

[0022] Figure 4 This is a partially enlarged schematic diagram of the delivery pump in the ice maker system of the present invention.

[0023] In the diagram: 1. Shell; 2. Upper end cover; 3. Lower end cover; 4. Rotating shaft; 5. Spiral scraper; 6. Gearbox; 7. Motor; 8. Spiral guide plate; 9. Turbulence component; 11. Outer cylinder; 12. Middle cylinder; 13. Inner cylinder; 14. Water inlet pipe; 15. Ice outlet pipe; 16. Refrigerant inlet pipe; 17. Refrigerant outlet pipe; 18. Circulation pipe; 19. First pipeline; 20. Water pump; 21. Volute; 22. Centrifugal impeller; 23. Pump shaft; 24. Pump inlet pipe; 25. Front plate; 26. Rear plate; 27. Blade; 28. Adjustment mechanism; 29. ​​Positioning sleeve; 30. Third guide vane; 31. Positioning connector; 281. Outer ring; 282. Inner ring; 283. First guide vane; 284. Second guide vane; 291. Cylinder section; 292. Positioning platform stage. Detailed Implementation

[0024] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0025] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] like Figure 1 As shown, an ice-making system of the present invention includes an ice-making mechanism, a refrigeration mechanism, and a water circulation mechanism. The ice-making mechanism includes a housing 1, an upper end cover 2, a lower end cover 3, a rotating shaft 4, and a spiral scraper 5. The upper end cover 2 and the lower end cover 3 are respectively connected to both ends of the housing 1. The rotating shaft 4 and the spiral scraper 5 are installed inside the housing 1. The spiral scraper 5 is fixedly connected to the outer peripheral wall of the rotating shaft 4 and extends spirally along the axial direction of the rotating shaft 4. Both ends of the rotating shaft 4 are rotatably connected to the housing 1 through bearings. One end of the rotating shaft 4 is connected to a motor 7 through a gearbox 6. The housing 1 includes an outer cylinder 11, a middle cylinder 12, and an inner cylinder 13 arranged radially in sequence. The outer cylinder 11 and the middle cylinder 12 are connected to each other. The middle cylinder 12 and the inner cylinder 13 form a heat insulation cavity, and the inner cavity of the inner cylinder 13 forms an ice-making cavity. A spiral guide plate 8 is provided in the refrigeration cavity, which extends spirally along the axial direction. Multiple turbulence-inducing elements 9 are provided in the refrigeration cavity, which are located on the outer peripheral wall of the inner cylinder 13 or on the spiral blades of the spiral guide plate 8. The lower end of the shell 1 is connected to a water inlet pipe 14 and a refrigerant inlet pipe 16. The water inlet pipe 14 is connected to the ice-making cavity, and the refrigerant inlet pipe 16 is connected to the refrigeration cavity. The upper end of the shell 1 is connected to an ice outlet pipe 15 and a refrigerant outlet pipe 17. The ice outlet pipe 15 is connected to the ice-making cavity, and the refrigerant outlet pipe 17 is connected to the refrigeration cavity.

[0028] The refrigeration system includes a compressor, a condenser, and an expansion valve. The refrigerant outlet pipe 17 is connected to / communicated with the compressor, condenser, expansion valve, and refrigerant inlet pipe 16 via pipelines.

[0029] The water circulation mechanism includes a circulation pipe 18, a first pipeline 19, a water pump 20, and a second pipeline. The circulation pipe 18 is mounted on the lower end cover 3 and is connected to the water pump 20 via the first pipeline 19. The water pump 20 is connected to the inlet pipe 14 via a pipeline. An ice delivery pipe is connected to the ice outlet pipe 15, and the ice delivery pipe is connected to the water pump 20 via the second pipeline. This invention, through the design of the water circulation mechanism, enables the recycling of water within the ice-making mechanism, improves the flow pattern of the ice-water medium within the ice-making mechanism, and achieves water recycling during the ice delivery process.

[0030] like Figure 2-4 As shown, the arrow "→" indicates the fluid flow direction. The present invention provides a delivery pump for an ice-making system. The pump 20 includes a volute 21, a centrifugal impeller 22, and a pump shaft 23. The centrifugal impeller 22 is installed inside the volute 21 and on the pump shaft 23. A pump inlet pipe 24 is provided at the inlet end of the volute 21. The centrifugal impeller 22 includes a front plate 25, a rear plate 26, and blades 27. Multiple blades 27 are distributed circumferentially and connected between the front plate 25 and the rear plate 26. An adjusting mechanism 28 is installed inside the pump inlet pipe 24. The adjusting mechanism 28 is located upstream of the centrifugal impeller 22 and serves to guide and seal the flow.

[0031] The regulating mechanism 28 includes an outer ring 281, an inner ring 282, and a first guide vane 283. The first guide vane 283 is connected between the outer ring 281 and the inner ring 282. Multiple first guide vanes 283 are distributed circumferentially. The first guide vanes 283 are arranged opposite to the inlet ring of the front disc 25 and form a first sealing gap between them. The outer ring 281 is installed on the inner circumferential wall of the pump inlet pipe 24 and is axially positioned by a positioning sleeve 29. The positioning sleeve 29 is installed on the inner circumferential wall of the pump inlet pipe 24.

[0032] The regulating mechanism 28 also includes a second guide vane 284, which is disposed on the inner peripheral wall of the inner ring 282. Multiple second guide vanes 284 are distributed circumferentially. A second sealing gap is formed between the downstream end of the second guide vane 284 and the inlet ring of the front disc 25. The first sealing gap extends radially and the second sealing gap extends axially.

[0033] The present invention, through the design of the adjustment mechanism 28, can improve the guiding and sealing effect at the inlet end of the centrifugal impeller 22, thereby reducing turbulence and flow loss at the impeller inlet end, thus ensuring the stability of the pump output pressure and flow rate, and improving the operational stability of the delivery pump.

[0034] Furthermore, a third guide vane 30 is provided on the outer circumferential surface of the inlet ring of the front disc 25. Multiple third guide vanes 30 are distributed circumferentially. A third sealing gap is formed between the third guide vane 30 and the inner circumferential surface (or the sealing ring of the inner circumferential surface) of the pump inlet pipe 24. The third sealing gap extends axially. The third guide vane 30 and the first guide vane 283 are arranged opposite each other in the axial direction. The third guide vane 30 is formed in the form of a material removal groove.

[0035] Multiple positioning holes are provided on the outer circumferential surface of the outer ring 281, distributed circumferentially. One or more connection holes are provided on the pump inlet pipe 24, and positioning connectors 31 are sealed to the connection holes. The adjusting mechanism 28 can rotate circumferentially to position and connect the positioning connectors 31 with different positioning holes. The positioning connectors 31 are used to adjust and position / fix the adjusting mechanism 28 at multiple positions in the circumferential direction, thereby realizing the preset correspondence between the first guide vane 283 and the third guide vane 30. For example, in the circumferential direction, the first guide vane 283 and the third guide vane 30 are offset at a certain angle (the offset angle can be adjusted according to design and process requirements) or aligned.

[0036] The present invention, through the design of the adjustment mechanism 28, specifically the adjustment mechanism 28 being circumferentially rotatable, enables the positioning connector 31 to be positioned and connected with different positioning holes, thereby realizing the preset correspondence between the first guide vane 283 and the third guide vane 30. This can further improve the guiding and sealing effect at the inlet end of the centrifugal impeller 22, thereby reducing turbulence and flow loss at the impeller inlet end, thus ensuring the stability of the pump output pressure and flow rate, and improving the operational stability of the delivery pump.

[0037] Furthermore, the first guide vane 283, the second guide vane 284, and the third guide vane 30 are plate-shaped and their profiles are inclined relative to the rotation axis of the centrifugal impeller 22; or they are arc-shaped or spiral arc-shaped and their profiles are curved relative to the rotation axis of the centrifugal impeller 22.

[0038] The positioning sleeve 29 includes a cylindrical section 291 and a positioning platform stage 292. The downstream end of the cylindrical section 291 abuts against the outer ring 281, and the upstream end is provided with the positioning platform stage 292, which is fitted into the positioning groove of the flange at the upstream end of the pump inlet pipe 24.

[0039] like Figure 3-4 As shown, the arrow "→" indicates the direction of fluid flow. The second guide vane 284 has an axial length L, the first guide vane 283 has an axial length L3, the second guide vane 284 and the third guide vane 30 have an axial overlap length L2, the first sealing gap has an axial length L1, and L1+L2+L3=L.

[0040] The axial lengths are: L1 = (0.05-0.25)L, preferably 0.15; L2 = (0.2-0.4)L, preferably 0.3; L3 = (0.45-0.65)L, preferably 0.55.

[0041] The first guide vane 283 has a radial width h, h = (0.2-0.4)L, preferably 0.3.

[0042] By adjusting the specific structure and parameter / size design of the adjustment mechanism 28 (axial length L1, L2, L3, L, radial width h), the present invention can further improve the guiding and sealing effect of the inlet end of the centrifugal impeller 22, thereby reducing the turbulence and flow loss at the impeller inlet end, thus ensuring the stability of the pump output pressure and flow rate, and improving the operational stability of the delivery pump.

[0043] An ice-making machine system and its delivery pump according to the present invention have the following beneficial technical effects:

[0044] (1) By adjusting the design of the mechanism 28, the present invention can improve the flow guidance and sealing effect at the inlet end of the centrifugal impeller 22, thereby reducing the turbulence and flow loss at the inlet end of the impeller, thus ensuring the stability of the pump output pressure and flow rate, and improving the operational stability of the pump.

[0045] (2) The present invention can rotate circumferentially through the adjustment mechanism 28 to realize the positioning and connection of the positioning connector 31 with different positioning holes, thereby realizing the preset correspondence between the first guide vane 283 and the third guide vane 30; through the design of the specific structure and parameters / sizes of the adjustment mechanism 28 (axial length L1, L2, L3, L, radial width h), the guiding and sealing effect of the inlet end of the centrifugal impeller 22 can be further improved, thereby reducing the turbulence and flow loss at the inlet end of the impeller, thereby ensuring the stability of the pump output pressure and flow rate, and improving the operation stability of the delivery pump.

[0046] (3) Through the design of the water circulation mechanism, the present invention can realize the recycling of water in the ice-making mechanism, improve the flow state of the ice-water medium in the ice-making mechanism, and realize the recycling of water during the ice conveying process.

[0047] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ice-making system, comprising an ice-making mechanism, a refrigeration mechanism, and a water circulation mechanism, wherein the ice-making mechanism comprises a housing (1), an upper end cover (2), a lower end cover (3), a rotating shaft (4), and a spiral scraper (5), the upper end cover and the lower end cover are respectively connected to both ends of the housing, the rotating shaft and the spiral scraper are installed inside the housing, the housing comprises an outer cylinder (11), a middle cylinder (12), and an inner cylinder (13) arranged radially in sequence, the outer cylinder and the middle cylinder form a heat insulation cavity, the middle cylinder and the inner cylinder form a refrigeration cavity, the inner cavity of the inner cylinder forms an ice-making cavity, and a water inlet pipe (14) and a refrigerant inlet are connected to the lower end of the housing. Pipe (16), the water inlet pipe is connected to the ice-making chamber, the refrigerant inlet pipe is connected to the refrigeration chamber, the upper end of the shell is connected to the ice outlet pipe (15) and the refrigerant outlet pipe (17), the ice outlet pipe is connected to the ice-making chamber, and the refrigerant outlet pipe is connected to the refrigeration chamber; the refrigeration mechanism includes a compressor and an expansion valve; the water circulation mechanism includes a circulation pipe (18), a first pipeline (19), a water pump (20), and a second pipeline, the circulation pipe is set on the lower end cover, the circulation pipe is connected to the water pump through the first pipeline, and the water pump is connected to the water inlet pipe through the pipeline; the ice outlet pipe is connected to an ice conveying pipe, and the ice conveying pipe is connected to the water pump through the second pipeline; Its features are: The water pump includes a volute (21), a centrifugal impeller (22), and a pump shaft (23). The centrifugal impeller is installed inside the volute and on the pump shaft. The inlet end of the volute is provided with a pump inlet pipe (24). The centrifugal impeller includes a front plate (25), a rear plate (26), and blades (27). Multiple blades are distributed circumferentially and connected between the front plate and the rear plate. An adjustment mechanism (28) is installed inside the pump inlet pipe. The adjustment mechanism is located at the upstream end of the centrifugal impeller and plays the role of guiding and sealing. The adjustment mechanism (28) includes an outer ring (281), an inner ring (282), and a first guide vane (283). The first guide vane is connected between the outer ring and the inner ring. Multiple first guide vanes are distributed circumferentially. The first guide vane is set opposite to the inlet ring of the front plate and forms a first sealing gap between them. The outer ring is installed on the inner circumferential wall of the pump inlet pipe and is axially positioned by a positioning sleeve (29). The positioning sleeve is installed on the inner circumferential wall of the pump inlet pipe. The regulating mechanism (28) also includes a second guide vane (284), which is disposed on the inner peripheral wall of the inner ring. Multiple second guide vanes are distributed circumferentially. A second sealing gap is formed between the downstream end of the second guide vane and the inlet ring of the front disc (25). The first sealing gap extends radially and the second sealing gap extends axially. The positioning sleeve (29) includes a cylindrical section (291) and a positioning platform stage (292). The downstream end of the cylindrical section abuts against the outer ring (281), and the upstream end is provided with a positioning platform stage, which fits into the positioning groove of the flange at the upstream end of the pump inlet pipe (24). Multiple positioning holes are provided on the outer circumferential surface of the outer ring (281), and the multiple positioning holes are distributed along the circumferential direction. One or more connection holes are provided on the pump inlet pipe (24), and a positioning connector (31) is sealed and connected to the connection hole. The adjustment mechanism (28) can rotate along the circumferential direction to realize the positioning connector and different positioning holes for positioning and connection. The positioning connector (31) is used to realize the adjustment and positioning of the adjustment mechanism (28) in multiple positions in the circumferential direction, thereby realizing the preset correspondence between the first guide vane (283) and the third guide vane (30).

2. The ice-making system as described in claim 1, characterized in that, The outer circumferential surface of the inlet ring of the front disc (25) is provided with a third guide vane (30). Multiple third guide vanes are distributed circumferentially. A third sealing gap is formed between the third guide vane and the inner circumferential surface of the pump inlet pipe (24) or the sealing ring of the inner circumferential surface. The third sealing gap extends axially. The third guide vane and the first guide vane (283) are arranged opposite each other in the axial direction. The third guide vane is formed in the form of a material removal groove.

3. The ice-making system as described in claim 2, characterized in that, The first guide vane, the second guide vane, and the third guide vane are plate-shaped and their profiles are inclined relative to the rotation axis of the centrifugal impeller (22); or they are arc-shaped and their profiles are curved relative to the rotation axis of the centrifugal impeller.

4. An ice-making system as described in claim 2, characterized in that, The second guide vane (284) has an axial length L, the first guide vane (283) has an axial length L3, the second guide vane and the third guide vane (30) have an axial overlap length L2, the first sealing gap has an axial length L1, and L1+L2+L3=L.

5. An ice-making system as described in claim 4, characterized in that, Axial lengths L1 = (0.02-0.3)L, L2 = (0.15-0.45)L, L3 = (0.4-0.7)L.

6. An ice-making system as described in claim 4, characterized in that, The first guide vane (283) has a radial width h, h = (0.15-0.45)L.

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