Variable-frequency air cooler
By combining two sets of evaporators to control the distribution of cooling capacity, the problem of existing air coolers being unable to deliver air at ultra-low temperatures is solved. This achieves low-temperature air delivery and avoids evaporator freezing, making it suitable for the cooling needs of the plastics grinding industry.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-03
AI Technical Summary
Existing air coolers cannot deliver air at ultra-low temperatures, especially in the plastics grinding industry where they cannot meet the demand for rapid cooling, resulting in plastic powders fusing and clumping at high temperatures.
The system employs a combination of two evaporators, with electronic expansion valves and thermal expansion valves used to control the distribution of cooling capacity. Combined with a water-cooled condenser and drip tray design, it achieves low-temperature air delivery and prevents evaporator frost formation.
It achieves low-temperature air supply down to 5 degrees Celsius, preventing evaporator icing, and is suitable for the plastic grinding industry to prevent powder agglomeration, thus improving the stability and efficiency of the refrigeration system.
Smart Images
Figure CN224080437U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of air conditioning, and in particular to a variable frequency air cooler. Background Technology
[0002] Current air coolers cannot deliver air at ultra-low temperatures; the typical outlet air temperature is above 10 degrees Celsius, which is insufficient for some special cooling applications. For example, in the plastics grinding industry, if rapid cooling is not achieved during plastic grinding and powder production, the plastic powder will fuse at high temperatures, forming clumps. Utility Model Content
[0003] The purpose of this invention is to provide a variable frequency air cooler with a reasonable structure that can achieve a low temperature of 10 degrees Celsius and prevent frost from forming on the evaporator.
[0004] The purpose of this utility model is achieved as follows:
[0005] A variable frequency air cooler includes a chassis, a variable frequency refrigeration system, and a fan. The chassis has an air inlet chamber and an air outlet chamber, and the fan is installed in the air outlet chamber. The variable frequency refrigeration system includes a variable frequency compressor, a condenser, a filter tank, and an evaporator assembly. The evaporator assembly includes at least a first evaporator and a second evaporator, which are sequentially arranged between the air inlet chamber and the air outlet chamber. The exhaust port of the variable frequency compressor is connected to the input end of the condenser, and the output end of the condenser is connected to the input ends of the first and second evaporators respectively through a first expansion valve and a second expansion valve. The output ends of the first and second evaporators are connected to the return air port of the variable frequency compressor.
[0006] The objective of this invention can also be achieved by the following technical measures:
[0007] As a more specific embodiment, the first expansion valve and the second expansion valve are respectively an electronic expansion valve and a thermal expansion valve.
[0008] As a further option, the output ends of the first and second evaporators are connected to the return port of the variable frequency compressor via a filter tank.
[0009] As a further embodiment, the chassis is formed by a frame and panel, with a bottom cavity at the bottom, and the condenser is located inside the bottom cavity; the air inlet cavity and air outlet cavity are located above the bottom cavity; and a water collection tray is provided at the bottom of the evaporator assembly.
[0010] As a further embodiment, the water receiving tray is connected to a drain pipe, which extends out through the side wall of the bottom cavity; the condenser is a water-cooled condenser, which includes a water tank and a coil. The water tank is provided with an inlet pipe and an outlet pipe, which extend out of the side wall of the bottom cavity. The coil is installed inside the water tank, with both ends extending out of the water tank to form the input end and output end of the condenser.
[0011] As a further embodiment, the air outlet cavity is provided with a conical air outlet hood, the fan is installed inside the air outlet hood, and the air outlet of the air outlet hood extends out of the casing.
[0012] As a further embodiment, the side walls and top walls of the air inlet cavity are provided with air inlet windows of the same size and shape. The air inlet windows can be selectively connected to a detachable panel or an air inlet hood. The outer end of the air inlet hood is provided with an air inlet, and the inner end of the air inlet hood is provided with a filter screen.
[0013] As a further solution, the chassis is equipped with casters at the bottom.
[0014] As a further option, an electrical control box is provided on the side wall of the air outlet cavity.
[0015] As a further solution, a temperature sensor is installed inside the air outlet of the air hood.
[0016] The beneficial effects of this utility model are as follows:
[0017] (1) The variable frequency air cooler of this utility model is equipped with two or more evaporators to achieve graded distribution of cooling capacity, avoid the evaporator temperature from freezing due to excessively low temperature, and affect heat exchange. The two-stage evaporator can achieve low temperature (as low as 5 degrees Celsius) and avoid freezing.
[0018] (2) The variable frequency air cooler of this utility model is equipped with two evaporators. The first evaporator is allocated more cooling capacity than the second evaporator. Moreover, the first evaporator uses an electronic expansion valve to control the cooling capacity, which is more precise, thereby avoiding a large amount of refrigerant after the compressor passes through the condenser and enters the first evaporator, causing it to freeze. After the first stage is properly allocated the cooling capacity, the cooling capacity of the second stage is better controlled, and the refrigerant can be allocated through a low-cost thermostatic expansion valve.
[0019] (3) The variable frequency air cooler of this utility model is especially suitable for the plastic grinding industry, and its low temperature air can prevent plastic powder from clumping. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model.
[0021] Figure 2 This is a schematic diagram of the internal structure of this utility model.
[0022] Figure 3 This is a schematic diagram of the main structure of this utility model.
[0023] Figure 4 for Figure 3 Schematic diagram of the installation structure at the rear of the central air intake shroud.
[0024] Figure 5This is a schematic diagram of the upper and rear mounting structure of the air inlet cover in this utility model. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0026] See Figures 1 to 3 As shown, a variable frequency air cooler includes a casing 1, a variable frequency refrigeration system, and a fan 7. The casing 1 has an air inlet chamber 14 and an air outlet chamber 15. The fan 7 is disposed in the air outlet chamber 15. The variable frequency refrigeration system includes a variable frequency compressor 4, a condenser 8, a filter tank 5, and an evaporator assembly. The evaporator assembly includes at least a first evaporator 61 and a second evaporator 62, which are sequentially disposed between the air inlet chamber 14 and the air outlet chamber 15. The exhaust port of the variable frequency compressor 4 is connected to the input end of the condenser 8. The output end of the condenser 8 is connected to the input ends of the first evaporator 61 and the second evaporator 62 through a first expansion valve 63 and a second expansion valve 64, respectively. The output ends of the first evaporator 61 and the second evaporator 62 are connected to the return air port of the variable frequency compressor 4.
[0027] The first expansion valve 63 and the second expansion valve 64 are an electronic expansion valve and a thermal expansion valve, respectively.
[0028] The output ends of the first evaporator 61 and the second evaporator 62 are connected to the return port of the variable frequency compressor 4 through the filter tank 5.
[0029] The chassis 1 is formed by a frame 11 and a panel 12, and a bottom cavity 16 is provided at its lower part. The condenser 8 is located in the bottom cavity 16. The air inlet cavity 14 and the air outlet cavity 15 are located above the bottom cavity 16. A water receiving tray 9 is provided at the bottom of the evaporator assembly.
[0030] The water receiving tray 9 is connected to a drain pipe 91, which extends out through the side wall of the bottom cavity 16. The condenser 8 is a water-cooled condenser 8, which includes a water tank and a coil. The water tank is provided with an inlet pipe 81 and an outlet pipe 82, which extend out of the side wall of the bottom cavity 16. The coil is installed inside the water tank, with both ends extending out of the water tank to form the input end 84 and the output end 83 of the condenser 8.
[0031] The air outlet chamber 15 is provided with a conical air outlet hood 2, the fan 7 is installed inside the air outlet hood 2, and the air outlet of the air outlet hood 2 extends out of the casing 1.
[0032] The side walls and top walls of the air inlet chamber 14 are provided with air inlet windows of the same size and shape. The air inlet windows can be selectively connected to the detachable panel 12 or the air inlet hood 3. The outer end of the air inlet hood 3 is provided with an air inlet 32, and the inner end of the air inlet hood 3 is provided with a filter screen 31.
[0033] The bottom of the chassis 1 is equipped with casters.
[0034] An electrical control box 13 is provided on the side wall of the air outlet cavity 15.
[0035] A temperature sensor (not shown in the figure) is installed inside the air outlet of the air outlet hood 2 to detect the air outlet temperature.
[0036] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.
Claims
1. A variable frequency cold air blower, comprising a cabinet, a variable frequency refrigeration system and a fan, an air inlet cavity and an air outlet cavity are arranged in the cabinet, and the fan is arranged in the air outlet cavity, characterized in that: The variable frequency refrigeration system comprises a variable frequency compressor, a condenser, a filter tank and an evaporator group, the evaporator group comprising at least a first evaporator and a second evaporator, the first evaporator and the second evaporator being arranged in sequence between an air inlet cavity and an air outlet cavity; An exhaust port of the variable frequency compressor is connected with an input end of the condenser, an output end of the condenser is connected with input ends of the first evaporator and the second evaporator through first and second expansion valves respectively, and output ends of the first evaporator and the second evaporator are connected with a return air port of the variable frequency compressor.
2. The variable frequency cold air blower according to claim 1, characterized in that: The first and second expansion valves are electronic expansion valves and thermal expansion valves respectively.
3. The variable frequency cold air blower as claimed in claim 1, characterized in that: Output ends of the first and second evaporators are connected with the return air port of the variable frequency compressor through the filter tank.
4. The variable frequency cold air blower according to claim 1, characterized in that: The cabinet is surrounded by a frame and cabinet plates, a bottom cavity is arranged at a lower part of the cabinet, the condenser is arranged in the bottom cavity, the air inlet cavity and the air outlet cavity are arranged above the bottom cavity, and a water pan is arranged at a bottom of the evaporator group.
5. The variable frequency cooling fan of claim 4, wherein: The water pan is connected with a drain pipe, the drain pipe extends out of a side wall of the bottom cavity, the condenser is a water-cooled condenser, the water-cooled condenser comprises a water tank and a coil pipe, the water tank is provided with an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe extend out of the side wall of the bottom cavity, the coil pipe is arranged in the water tank, and two ends of the coil pipe extend out of the water tank and form an input end and an output end of the condenser respectively.
6. The variable speed cold air blower of claim 1, wherein: A conical air outlet cover is arranged in the air outlet cavity, the fan is arranged in the air outlet cover, and an air outlet of the air outlet cover extends out of the cabinet.
7. The variable frequency cold air blower as claimed in claim 1, characterized in that: Side walls and a top wall of the air inlet cavity are provided with air inlet windows of the same size and shape, the air inlet windows are selectively connected with detachable cabinet plates or an air inlet cover, an air inlet is arranged at an outer end of the air inlet cover, and a filter screen is arranged at an inner end of the air inlet cover.
8. The variable frequency cold air blower as claimed in claim 1, characterized in that: The cabinet is provided with casters at a bottom part of the cabinet.
9. The variable speed cold air blower of claim 1, wherein: A side wall of the air outlet cavity is provided with an electric control box.
10. The variable speed cold air blower of claim 6, wherein: A temperature sensor is arranged in the air outlet of the air outlet cover.