Nitrogen emission centrifugal fan capable of preventing fan blades from frosting

Abstract

The utility model discloses a nitrogen emission centrifugal fan capable of preventing frosting of fan blades, which comprises an exhaust fan body, the input end of the exhaust fan is provided with a nitrogen interface, the output end of the exhaust fan is provided with an exhaust port, the bottom end of the exhaust fan is provided with an air interface, the air interface is communicated with the input end, and the exhaust port is communicated with the exhaust port. The nitrogen connector communicates with a first connecting pipe, the air connector communicates with a second connecting pipe, butterfly valves are rotationally installed in the first connecting pipe and the second connecting pipe, and connecting plates are fixedly installed on the side walls of the two butterfly valves. In order to prevent the fan blades of the exhaust fan from being frosted by low-temperature nitrogen, the second connecting pipe is arranged on the lower portion of the exhaust fan, air can be extracted while nitrogen is extracted, the nitrogen can be heated through the air, and therefore the fan blades of the fan are prevented from being frosted; the air suction speed can be adjusted according to working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen quick-freezing, in particular to a nitrogen discharge centrifugal fan for preventing the fan blades from frosting. Background Technique

[0002] The liquid nitrogen quick-freezing machine is an indispensable high-efficiency quick-freezing device in the modern food processing industry. It utilizes liquid nitrogen to rapidly vaporize into nitrogen gas in the cold chamber of the quick-freezing machine, absorbing a large amount of heat, thereby realizing the rapid cooling and freezing of food. However, the temperature of the nitrogen gas after the vaporization of liquid nitrogen is still relatively low. If directly discharged into the environment, it will not only cause waste of energy, but also may have an adverse impact on the surrounding environment. More importantly, when these low-temperature nitrogen gases are discharged through the exhaust system, they will have a certain impact on the fan blades of the centrifugal fan.

[0003] The nitrogen discharge centrifugal fan, as a key component of the exhaust system of the liquid nitrogen quick-freezing machine, undertakes the important task of effectively discharging the low-temperature nitrogen gas generated during the quick-freezing process. Its working principle is to generate centrifugal force through the high-speed rotation of the fan blades, pushing the gas from the suction end to the discharge end. However, during the long-term operation of the liquid nitrogen quick-freezing machine, the low-temperature nitrogen gas continuously cools the fan blades of the centrifugal fan, causing the surface temperature of the fan blades to gradually decrease, which provides conditions for the formation of frost. With the continuous accumulation of frost, the exhaust air volume of the fan will gradually decrease, the working efficiency will decrease significantly, and even may lead to the blockage of the entire exhaust system, affecting the normal operation of the quick-freezing machine. Therefore, how to effectively deal with the adverse impact of low-temperature nitrogen gas on the fan blades without changing the basic working principle of the centrifugal fan has become an urgent technical problem to be solved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a nitrogen discharge centrifugal fan for preventing the fan blades from frosting to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a nitrogen discharge centrifugal fan for preventing the fan blades from frosting, including a suction fan body. A nitrogen interface is arranged at the input end of the suction fan, an exhaust port is arranged at the output end of the suction fan, an air interface is arranged at the bottom end of the suction fan, and the air interface is communicated with the input end. The nitrogen interface is connected with a first connecting pipe in a communicating manner, the air interface is connected with a second connecting pipe in a communicating manner. Butterfly valves are rotatably installed inside the first connecting pipe and the second connecting pipe. A connecting plate is fixedly installed on the side walls of the two butterfly valves. A rotating shaft is fixedly installed on the connecting plate. The two rotating shafts respectively penetrate through the side walls of the first connecting pipe and the second connecting pipe and are rotatably connected with the first connecting pipe and the second connecting pipe respectively. Rotating valve bodies are fixedly installed on the two rotating shafts. A transmission component is arranged between the two rotating valve bodies.

[0006] As a further description of the above technical solution: The transmission assembly includes a first bevel gear and a second bevel gear, the first bevel gear and the second bevel gear are respectively fixedly connected to two rotating shafts, and the first bevel gear and the second bevel gear are meshed with each other.

[0007] As a further description of the above technical solution: One end of the rotating shaft arranged on the second connecting pipe penetrates through the second bevel gear and is fixedly installed with a knob.

[0008] As a further description of the above technical solution: A first encapsulation pipe and a second encapsulation pipe are respectively fixedly installed on the first connecting pipe and the second connecting pipe, the first encapsulation pipe and the second encapsulation pipe are respectively sleeved outside the two rotating shafts, an encapsulation box is fixedly installed between the first encapsulation pipe and the second encapsulation pipe, the knob is arranged on the side wall of the encapsulation box, and a locking assembly is arranged inside the encapsulation box.

[0009] As a further description of the above technical solution: The locking assembly includes a bolt threadedly installed at the bottom end of the encapsulation box and a locking gear arranged inside the encapsulation box, a locking tooth plate is rotatably installed at the top end of the bolt, the locking tooth plate is arranged directly below the locking gear, and the locking gear is fixedly connected to one of the rotating shafts.

[0010] As a further description of the above technical solution: A pointing groove is arranged on the side wall of the knob, and a circle of scale grooves is arranged on the side wall of the encapsulation box.

[0011] As a further description of the above technical solution: A connecting hose is arranged on the first connecting pipe, and the connecting hose is arranged between the nitrogen interface and the first connecting pipe.

[0012] As a further description of the above technical solution: Sealing rings are arranged at both ends of the connecting hose.

[0013] The utility model provides a nitrogen discharge centrifugal fan for preventing fan blades from frosting. It has the following beneficial effects:

[0014] 1. In order to prevent the fan blades of the exhaust fan from frosting due to low-temperature nitrogen, a second connecting pipe is arranged below, which can realize the extraction of air while extracting nitrogen, and the air can heat up the nitrogen, thereby preventing the fan blades from frosting. And the internal motor of the exhaust fan is a variable-frequency motor, which can adjust the air suction speed according to the working conditions.

[0015] 2. However, in some cases, such as when the voltage is unstable or the frequency conversion function fails, the motor cannot adjust its speed, and it is necessary to adjust through two butterfly valves to adjust the gas flow rate inside the pipeline. In order to ensure that the nitrogen and oxygen flow rates inside the first connecting pipe and the second connecting pipe are mutually adapted, so as to achieve a stable anti-frosting effect, at this time, it is necessary to adjust the two butterfly valves simultaneously through the transmission component, realizing the adjustment of the flow rates inside the two pipelines under different working conditions. Compared with the frequency conversion motor, the butterfly valves and the transmission component are of pure mechanical design, with better stability and error tolerance.

[0016] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the present disclosure.

[0017] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and does not represent the full scope of the disclosed technology or a comprehensive disclosure of all features. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic three-dimensional structure diagram of an overall nitrogen discharge centrifugal fan for preventing the fan blades from frosting proposed by the present utility model;

[0019] Figure 2 For the present utility model Figure 1 The enlarged structure schematic diagram of part A;

[0020] Figure 3 It is a schematic sectional structure diagram of the present utility model;

[0021] Figure 4 It is a schematic sectional three-dimensional structure diagram of the present utility model;

[0022] Figure 5 It is a schematic three-dimensional structure diagram of the present utility model when the butterfly valves and the transmission component are not installed.

[0023] LEGEND DESCRIPTION

[0024] 1. Exhaust fan; 2. Nitrogen interface; 3. Air interface; 4. Exhaust port; 5. First connecting pipe; 6. Second connecting pipe; 7. First encapsulation pipe; 8. Second encapsulation pipe; 9. Connecting hose; 10. Knob; 11. Pointing groove; 12. Scale groove; 13. Butterfly valve; 14. Connecting plate; 15. Rotating shaft; 16. Rotating valve body; 17. First bevel gear; 18. Second bevel gear; 19. Locking gear; 20. Locking tooth plate; 21. Bolt; 22. Sealing ring; 24. Liquid nitrogen quick-freezing machine body; 26. Encapsulation box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] Referring to Figures 1-5 , a nitrogen-emitting centrifugal fan for preventing fan blades from frosting, comprising a blower 1 body. A nitrogen interface 2 is provided at the input end of the blower 1, and an exhaust port 4 is provided at the output end of the blower 1. An air interface 3 is provided at the bottom end of the blower 1, and the air interface 3 is communicated with the input end. The nitrogen interface 2 is connected to a first connecting pipe 5, and the air interface 3 is connected to a second connecting pipe 6. Butterfly valves 13 are rotatably installed inside the first connecting pipe 5 and the second connecting pipe 6. A connecting plate 14 is fixedly installed on the side walls of the two butterfly valves 13, and a rotating shaft 15 is fixedly installed on the connecting plate 14. The two rotating shafts 15 respectively penetrate the side walls of the first connecting pipe 5 and the second connecting pipe 6 and are rotatably connected to the first connecting pipe 5 and the second connecting pipe 6 respectively. Rotating valve bodies 16 are fixedly installed on the two rotating shafts 15, and a transmission assembly is arranged between the two rotating valve bodies 16; The other end of the first connecting pipe 5 is connected to the liquid nitrogen discharge end of the liquid nitrogen quick-freezing machine body 24. When the blower 1 is extracting nitrogen generated during the operation of the liquid nitrogen quick-freezing machine body 24, in order to prevent the fan blades of the blower 1 from frosting due to low-temperature nitrogen, a second connecting pipe 6 is provided below, which can realize the extraction of air while extracting nitrogen. The air can heat up the nitrogen, thereby preventing the fan blades from frosting. And the internal motor of the blower 1 is a variable-frequency motor, which can adjust the air intake speed according to the working conditions. However, in some cases, such as unstable voltage or variable-frequency function failure, the motor cannot adjust the speed, and it is necessary to adjust through the two butterfly valves 13, thereby adjusting the gas flow rate inside the pipeline. In order to ensure that the nitrogen and oxygen flow rates inside the first connecting pipe 5 and the second connecting pipe 6 are mutually adapted, so as to achieve a stable anti-frosting effect, at this time, it is necessary to adjust the two butterfly valves 13 simultaneously through the transmission assembly, realizing the adjustment of the flow rates inside the two pipelines under different working conditions. Compared with the variable-frequency motor, the butterfly valves 13 and the transmission assembly are of pure mechanical design, with better stability and error tolerance.

[0027] As a preferred technical solution of this embodiment, the transmission assembly includes a first bevel gear 17 and a second bevel gear 18. The first bevel gear 17 and the second bevel gear 18 are respectively fixedly connected to the two rotating shafts 15, and the first bevel gear 17 and the second bevel gear 18 are meshed with each other; When one of the rotating shafts 15 rotates, the first bevel gear 17 and the second bevel gear 18 rotate simultaneously, which can realize the adjustment of the butterfly valves 13 inside the first connecting pipe 5 and the second connecting pipe 6 at the same time.

[0028] As a preferred technical solution of this embodiment, one end of the rotating shaft 15 arranged on the second connecting pipe 6 penetrates through the second bevel gear 18 and is fixedly installed with a knob 10; the rotation of one of the rotating shafts 15 can be realized through the knob 10, and thus the two rotating shafts 15 are driven to rotate under the action of the bevel gears.

[0029] As a preferred technical solution of this embodiment, a first encapsulation pipe 7 and a second encapsulation pipe 8 are respectively and fixedly installed on the first connecting pipe 5 and the second connecting pipe 6. The first encapsulation pipe 7 and the second encapsulation pipe 8 are respectively sleeved outside the two rotating shafts 15. An encapsulation box 26 is fixedly installed between the first encapsulation pipe 7 and the second encapsulation pipe 8. The knob 10 is arranged on the side wall of the encapsulation box 26, and a locking component is arranged inside the encapsulation box 26; the first encapsulation pipe 7, the second encapsulation pipe 8 and the encapsulation box 26 can encapsulate the two rotating shafts 15 and the transmission component, protect the internal parts, and the locking component can lock the transmission component, so that the rotating shaft 15 will not rotate.

[0030] As a preferred technical solution of this embodiment, the locking component includes a bolt 21 threadedly installed at the bottom end of the encapsulation box 26 and a locking gear 19 arranged inside the encapsulation box 26. A locking tooth plate 20 is rotatably installed at the top end of the bolt 21. The locking tooth plate 20 is arranged directly below the locking gear 19, and the locking gear 19 is fixedly connected to one of the rotating shafts 15; after the adjustment is completed through the knob 10, by rotating the bolt 21, the bolt 21 can jack up the locking tooth plate 20, and the locking tooth plate 20 locks the locking gear 19. The locking of the locking gear 19 is realized, thereby realizing the limitation of the rotating shaft 15 and further realizing the limitation and fixation of the two butterfly valves 13.

[0031] As a preferred technical solution of this embodiment, a pointing groove 11 is arranged on the side wall of the knob 10, and a circle of scale grooves 12 is arranged on the side wall of the encapsulation box 26; through the pointing groove 11 and the scale grooves 12 of the knob 10, quantitative adjustment of the mutually adapted gas flow rates inside the first connecting pipe 5 and the second connecting pipe 6 can be realized.

[0032] As a preferred technical solution of this embodiment, a connecting hose 9 is arranged on the first connecting pipe 5, and the connecting hose 9 is arranged between the nitrogen interface 2 and the first connecting pipe 5; the arrangement of the connecting hose 9 can effectively relieve the vibration generated when the blower 1 body works, and effectively reduce the transmission of the vibration from the first connecting pipe 5 to the direction of the liquid nitrogen quick-freezing machine body 24.

[0033] As a preferred technical solution of this embodiment, sealing rings 22 are arranged at both ends of the connecting hose 9; the arrangement of the sealing rings 22 can enhance the sealing performance at the connecting hose 9, the first connecting pipe 5 and the nitrogen interface 2, and prevent nitrogen leakage.

[0034] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A nitrogen-emitting centrifugal fan for preventing fan blades from frosting, comprising a blower (1) body, wherein a nitrogen interface (2) is arranged at the input end of the blower (1), and an exhaust port (4) is arranged at the output end of the blower (1), characterized in that, The bottom end of the exhaust fan (1) is provided with an air interface (3), and the air interface (3) is communicated with the input end. The nitrogen interface (2) is connected with a first connecting pipe (5) in a communicating way, and the air interface (3) is connected with a second connecting pipe (6) in a communicating way. Butterfly valves (13) are rotatably installed inside both the first connecting pipe (5) and the second connecting pipe (6). A connecting plate (14) is fixedly installed on the side walls of the two butterfly valves (13). A rotating shaft (15) is fixedly installed on the connecting plate (14). The two rotating shafts (15) respectively penetrate through the side walls of the first connecting pipe (5) and the second connecting pipe (6) and are rotatably connected with the first connecting pipe (5) and the second connecting pipe (6) respectively. Rotating valve bodies (16) are fixedly installed on the two rotating shafts (15). A transmission component is arranged between the two rotating valve bodies (16).

2. The nitrogen discharge centrifugal fan for preventing the fan blade from frosting according to claim 1, wherein, The transmission component includes a first bevel gear (17) and a second bevel gear (18). The first bevel gear (17) and the second bevel gear (18) are respectively fixedly connected with the two rotating shafts (15), and the first bevel gear (17) and the second bevel gear (18) are meshed with each other.

3. The nitrogen-emitting centrifugal fan for preventing the fan blades from frosting according to claim 1, characterized in that, One end of the rotating shaft (15) arranged on the second connecting pipe (6) penetrates through the second bevel gear (18) and is fixedly installed with a knob (10).

4. The nitrogen-emitting centrifugal fan for preventing the fan blades from frosting according to claim 3, characterized in that, First encapsulation pipes (7) and second encapsulation pipes (8) are respectively fixedly installed on the first connecting pipe (5) and the second connecting pipe (6). The first encapsulation pipes (7) and the second encapsulation pipes (8) are respectively sleeved outside the two rotating shafts (15). An encapsulation box (26) is fixedly installed between the first encapsulation pipe (7) and the second encapsulation pipe (8). The knob (10) is arranged on the side wall of the encapsulation box (26), and a locking component is arranged inside the encapsulation box (26).

5. The nitrogen-emitting centrifugal fan for preventing the fan blades from frosting according to claim 4, wherein, The locking component includes a bolt (21) threadedly installed at the bottom end of the encapsulation box (26) and a locking gear (19) arranged inside the encapsulation box (26). The top end of the bolt (21) is rotatably installed with a locking toothed plate (20). The locking toothed plate (20) is arranged directly below the locking gear (19), and the locking gear (19) is fixedly connected with one of the rotating shafts (15).

6. A nitrogen discharge centrifugal fan for preventing the fan blades from frosting, characterized in that, A pointing groove (11) is arranged on the side wall of the knob (10), and a circle of scale grooves (12) is arranged on the side wall of the encapsulation box (26).

7. The nitrogen-emitting centrifugal fan for preventing the fan blades from frosting according to claim 1, wherein A connecting hose (9) is arranged on the first connecting pipe (5), and the connecting hose (9) is arranged between the nitrogen interface (2) and the first connecting pipe (5).

8. A nitrogen discharge centrifugal fan for preventing the fan blades from frosting, characterized in that, Sealing rings (22) are arranged at both ends of the connecting hose (9).

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