Automatic defrosting axial flow fan structure for liquid nitrogen quick freezing

Abstract

The utility model discloses an automatic defrosting axial flow fan structure for liquid nitrogen quick freezing, which comprises a mounting flange, a control motor mounted on the mounting flange, a rotating shaft connected with the control motor, fan blades connected with the rotating shaft, and a nozzle connected with an air pipe. The air inlet pipe is provided with an electromagnetic valve, the electromagnetic valve is connected with a PLC control system, the overall design of the structure is compact, blowing of fan blades of the axial flow fan can be achieved by spraying compressed air, the situation that the air uniformizing performance of the fan blades of the fan becomes poor due to low-temperature frosting is avoided, and the service life of the fan blades of the axial flow fan is prolonged. And therefore, the motor is overloaded.

Description

Technical Field

[0001] The utility model relates to the field of quick-freezing equipment, in particular to an automatic defrosting axial flow fan structure used for liquid nitrogen quick-freezing. Background Art

[0002] Liquid nitrogen quick freezing chamber is a device that uses liquid nitrogen as a cooling medium for rapid freezing. Liquid ammonia passes through the evaporator, absorbs heat while circulating indoors, and is converted into gas, rapidly lowering the indoor temperature. It is widely used in industries such as food processing, cold chain logistics, and biomedicine.

[0003] During the liquid nitrogen cooling process, axial flow fans are used to circulate the airflow, creating a uniform airflow in the quick-freezing chamber so that the cold air can effectively cover the product, ensuring uniform temperature distribution during the quick-freezing process and avoiding local overcooling or overheating.

[0004] However, the axial flow fans in the prior art generally lack a defrosting mechanism. For example, the patent with authorization announcement number CN217814056U discloses an axial flow fan, which includes a shell, a support frame, a motor and a fan blade assembly. The shell is fixedly connected to the support frame, the motor is fixedly connected to the support frame, the motor drive shaft is fixedly connected to the fan blade assembly, and the support frame includes a plurality of support plates. A guide plate is provided on the side of the support plate, and a guide groove is provided between the support plate and the guide plate. The guide groove is inclined toward the motor drive shaft, and the guide groove opens toward the air inlet. Since the axial flow fan of the above structure lacks a defrosting mechanism, frost at low temperature in the liquid nitrogen quick-freezing chamber will lead to problems such as poor uniform wind performance and motor overload. Utility Model Content

[0005] Purpose of the invention: The purpose of the utility model is to provide an automatic defrosting axial flow fan structure for liquid nitrogen quick freezing. The overall design of the structure is compact and can achieve the blowing of the axial flow fan blades by spraying compressed air, avoiding low-temperature frost which will cause the fan blades to have poor uniform wind performance, thereby causing problems such as motor overload.

[0006] Technical solution:

[0007] An automatic defrosting axial flow fan structure for liquid nitrogen quick freezing includes a mounting flange, a control motor is mounted on the mounting flange, the control motor is connected to a rotating shaft, the rotating shaft is connected to fan blades, and also includes a nozzle, the nozzle is connected to an air duct, an air inlet pipe is provided at one end of the air duct away from the nozzle, the air inlet pipe is provided with a solenoid valve, and the solenoid valve is connected to a PLC control system.

[0008] Preferably, the air duct includes an upper branch pipe and a lower branch pipe arranged around the rotating shaft, the upper branch pipe and the lower branch pipe are connected by two connecting pipes, and the upper branch pipe is connected to the air inlet pipe.

[0009] Preferably, a plurality of nozzles are equidistantly arranged along the circumference of the rotating shaft. The plurality of nozzles are equidistantly arranged, which can spray evenly over a large range, improve the dispersion of the spray, improve the defrosting efficiency, and ensure that the accumulated frost is quickly removed.

[0010] Preferably, the nozzle and the air duct are detachably connected via a flange. The nozzle and the air duct are connected by a flange, which is convenient and quick to disassemble, easy to clean and maintain, and reduces downtime.

[0011] Preferably, a universal joint is provided at the connecting end of the air duct and the nozzle, and the universal joint is connected to a control motor and an angle sensor.

[0012] Preferably, four nozzles are equidistantly arranged along the circumference of the rotating shaft.

[0013] Preferably, the nozzle is fixedly arranged on the lower branch pipe.

[0014] Preferably, the nozzle is directed toward the middle of the fan blades.

[0015] Preferably, the nozzle is arranged toward the rotation direction of the fan blades.

[0016] Preferably, a pressure relief valve is also provided on the air intake pipe, and the pressure relief valve is connected to a PLC control system. The pressure relief valve is provided on the air intake pipe to prevent the system from being dangerous due to overpressure, thereby ensuring the safety of the equipment.

[0017] Beneficial effect: The overall design of the structure is compact, and the axial fan blades can be purged by injecting compressed air, avoiding low-temperature frost that will cause the fan blades to have poor wind uniformity, thereby causing problems such as motor overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional Figure 1 ;

[0019] Figure 2 The three-dimensional Figure 2 ;

[0020] Figure 3 It is a plan view of the utility model;

[0021] Figure 4 It is a cross-sectional view of the present utility model. DETAILED DESCRIPTION

[0022] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1-4 As shown, an automatic defrosting axial flow fan structure for liquid nitrogen quick freezing includes a mounting flange 1, a control motor 2 is installed on the mounting flange 1, the control motor 2 is connected to a rotating shaft 3, the rotating shaft 3 is connected to a fan blade 4, and also includes a nozzle 51, the nozzle 51 is connected to an air duct 52, and the air duct 52 is provided with an air inlet pipe 53 at one end away from the nozzle, and the air inlet pipe 53 is provided with a solenoid valve, and the solenoid valve is connected to a PLC control system. The solenoid valve is connected to the PLC control system, which can realize intelligent control, automatically adjust the working state of the nozzle, and improve the degree of automation of the system. The overall design of the structure is compact, and the axial flow fan blades can be purged by injecting compressed air to avoid low-temperature frosting, which will cause the fan blades to have poor uniform wind performance, thereby causing problems such as motor overload.

[0025] In this embodiment, the air duct 52 includes an upper branch 521 and a lower branch 522 arranged around the rotating shaft 3. The upper branch 521 and the lower branch 522 are connected by two connecting pipes 523. The upper branch 521 is connected to the air intake pipe 53. The air duct adopts a design with upper and lower branches around the rotating shaft to optimize the airflow path, improve airflow efficiency, and reduce energy consumption.

[0026] In this embodiment, a plurality of nozzles 51 are equidistantly arranged along the circumference of the rotating shaft. The equidistant arrangement of the plurality of nozzles enables uniform spraying over a wide range, improves spray dispersion, improves defrosting efficiency, and ensures rapid removal of accumulated frost.

[0027] In this embodiment, the nozzle 51 is detachably connected to the air duct via a flange. The flange connection between the nozzle and the air duct facilitates quick disassembly, cleaning and maintenance, and reduces downtime.

[0028] In this embodiment, a universal joint is provided at the connection end between the air duct and the nozzle 51, to which a control motor and an angle sensor are connected. The universal joint design between the nozzle and the air duct allows the nozzle to rotate in multiple directions to adapt to different operating requirements and optimize the spray direction.

[0029] In this embodiment, four nozzles 51 are equidistantly arranged along the circumference of the rotation axis.

[0030] In this embodiment, the nozzle 51 is fixedly arranged on the lower branch pipe 522 .

[0031] In this embodiment, the nozzle 51 is directed toward the middle position of the fan blade 4, and the nozzle 51 is set toward the rotation direction of the fan blade 4. This setting is the setting in the general working state. After adding a universal joint, it can also be adjusted. Under normal circumstances, this structure can already clear frost very well, but because the nozzle 51 is directed toward the middle position of the fan blade 4, the defrost efficiency at both ends of the impeller is general. The setting of the universal joint enables the nozzle to be rotated to achieve defrost at a special position under special circumstances.

[0032] In this embodiment, a pressure relief valve is further provided on the air inlet pipe 53, and the pressure relief valve is connected to a PLC control system. The pressure relief valve provided on the air inlet pipe can prevent the system from being dangerous due to overpressure, thereby ensuring the safety of the equipment.

[0033] Under normal working conditions, the control motor 2 drives the fan blades 4 to rotate through the rotating shaft 3. The airflow generated by the fan blades circulates in the quick-freezing chamber, evenly distributing the cold air of liquid nitrogen to the surface of the product, quickly reducing the temperature of the product. When the system detects the formation of frost on the fan blades, the PLC control system will send a signal to start the solenoid valve to control the compressed air in the air inlet pipe 53 to flow into the air duct 52. The compressed air in the air inlet pipe 53 flows through the air duct 52 to multiple nozzles 51. The nozzles are arranged at equal distances along the circumference of the rotating shaft to ensure that the air is evenly sprayed onto the surface of the fan blades. The compressed air quickly blows away the accumulated frost and restores the normal airflow performance of the blades.

[0034] Temperature sensors can also be installed on the surface of the fan blades or near the blades. By monitoring the temperature of the blades in real time, it can be determined whether it is below the frost point. When the temperature drops close to the freezing point, it can be inferred that frost may begin to form on the blades. Humidity sensors can also be installed inside the quick-freeze chamber or near the fan to monitor the relative humidity of the air. If the humidity continues to be higher than the set threshold, it may indicate that moisture will condense on the blades, causing frost.

[0035] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic defrosting axial flow fan structure for liquid nitrogen quick freezing, characterized in that: The invention comprises a mounting flange (1), a control motor (2) being mounted on the mounting flange (1), the control motor (2) being connected to a rotating shaft (3), the rotating shaft (3) being connected to a fan blade (4), and a nozzle (51), the nozzle (51) being connected to an air duct (52), an air inlet pipe (53) being provided at one end of the air duct (52) away from the nozzle, the air inlet pipe (53) being provided with a solenoid valve, and the solenoid valve being connected to a PLC control system.

2. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: The air duct (52) comprises an upper branch pipe (521) and a lower branch pipe (522) arranged around the rotating shaft (3); the upper branch pipe (521) and the lower branch pipe (522) are connected via two connecting pipes (523); and the upper branch pipe (521) is connected to an air inlet pipe (53).

3. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: A plurality of nozzles (51) are arranged at equal intervals along the circumference of the rotating shaft.

4. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: The nozzle (51) is detachably connected to the air duct via a flange.

5. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: The connection end between the air duct and the nozzle (51) is provided with a universal joint, and the universal joint is connected to a control motor and an angle sensor.

6. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 3, characterized in that: Four nozzles (51) are arranged at equal intervals along the circumference of the rotating shaft.

7. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 3, characterized in that: The nozzle (51) is fixedly arranged on the lower branch pipe (522).

8. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: The nozzle (51) is directed toward the middle of the fan blade (4).

9. An automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to any one of claims 3 to 8, characterized in that: The nozzle (51) is arranged toward the rotation direction of the fan blade (4).

10. The automatic defrosting axial flow fan structure for liquid nitrogen quick freezing according to claim 1, characterized in that: A pressure relief valve is also provided on the air inlet pipe (53), and the pressure relief valve is connected to a PLC control system.

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