A variable frequency refrigeration system for small unit air-cooled freezers

Abstract

The present invention relates to the field of refrigeration equipment, specifically to a variable frequency refrigeration system applied to a small unit air-cooled refrigerator, comprising a variable frequency compressor and a frequency converter, the variable frequency compressor is mounted on the upper end surface of a mounting plate, the upper end surface of the mounting plate is provided with a box body that completely covers the outside of the variable frequency compressor, a lifting switch part is provided in the box body, and a vacuum exhaust part is provided on one side of the box body; the lifting switch part comprises a lifting plate, an air pipe is arranged at intervals on the lifting plate, an air outlet is arranged at the upper end of the air pipe, an air inlet is arranged at annular intervals at the lower part of the air pipe side wall, and the upward and downward sliding stroke of the lifting plate is limited by the height position of the air inlet at the lower part of the air pipe side wall; the vacuum exhaust part comprises a vacuum pump, and the exhaust end of the vacuum pump is connected to the exhaust pipeline through a connecting pipe. The present invention proposes a variable frequency refrigeration system applied to a small unit air-cooled refrigerator, which can adopt closed sound insulation to improve the sound insulation effect, and does not affect the heat dissipation and cooling of the variable frequency compressor.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a variable frequency refrigeration system applied to a small unit air-cooled freezer. Background Art

[0002] Small unit air-cooled refrigerators are a commonly used refrigeration device on the market. Refrigerator usually adopts fixed frequency compressor and capillary throttling device. This configuration performs well under stable operation, but when the working conditions change, its energy efficiency and adjustment ability are insufficient.

[0003] Therefore, the refrigerator with frequency conversion function adopts the frequency conversion refrigeration system, which has the function of real-time monitoring and adjustment through the frequency converter combined with the frequency conversion fan, frequency conversion compressor, sensor and other devices. That is, the frequency conversion compressor is controlled to adjust the speed according to the actual load demand, thereby avoiding unnecessary energy consumption and improving the energy efficiency of the system. At the same time, the control system can also automatically adjust the cooling capacity according to the temperature, humidity and other parameters set by the user.

[0004] However, the variable frequency compressor in the variable frequency refrigeration system of the existing refrigerators on the market will generate a lot of noise during operation. In order to eliminate the working noise of the compressor, the following technical solution is disclosed in the publication number CN112594998A, a variable frequency energy-saving silent refrigerator: a soundproof box is set in the refrigeration compartment to wrap the compressor, and the soundproof box can greatly reduce the noise emitted by the refrigerator when it is working; the user will not feel the loud sound during operation, and the advantages are obvious compared with similar products. Wrapping the compressor in this way to form a closed environment can certainly reduce noise, but the closed environment also makes it difficult for the variable frequency compressor to dissipate heat. The temperature continues to accumulate in the soundproof box, which can easily cause the compressor to malfunction. In severe cases, the temperature is too high and the compressor will burn out, seriously affecting personal and property safety. In this case, the water cooling system is usually installed in the soundproof box and connected to the variable frequency compressor, and the compressor is cooled by a water cooling pipeline, but this will increase the structure and occupy space, so it is not suitable for small unit air-cooled refrigerators. Summary of the invention

[0005] The present invention provides a closed variable frequency refrigeration system for small unit air-cooled refrigerators which has good sound insulation effect and does not affect the heat dissipation and cooling of the variable frequency compressor, so as to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The evacuation part of the air vent of the air vent is connected with the air vent of the air vent of the air vent by the air vent of the air vent in the air vent, and the evacuation part of the air vent is connected with the air vent of the air vent by the air vent of the air vent.

[0008] As a preferred solution of the present invention, a condenser is provided at the upper end of the mounting plate, a variable frequency condensing fan is provided at one side of the condenser, the heat exchange chamber is connected to the bottom of the mounting plate through the top connecting plate, an evaporator is provided in the heat exchange chamber, and a variable frequency evaporating fan is provided at the bottom of the heat exchange chamber on one side of the evaporator.

[0009] As a preferred solution of the present invention, a temperature sensor and a pressure sensor are provided in the variable frequency compressor, a temperature sensor is provided in the condenser and the evaporator, the frequency converter is electrically connected to the sensors, the frequency converter is electrically connected to the variable frequency condensing fan, the variable frequency evaporating fan and the variable frequency compressor, and the frequency converter performs variable frequency control on the variable frequency condensing fan, the variable frequency evaporating fan and the variable frequency compressor by receiving signals from the sensors.

[0010] As a preferred solution of the present invention, the bottom of the air pipe passes through the connecting plate and is provided with an extended sealing edge, and a sealing pad adapted to the bottom of the connecting plate is provided on the extended sealing edge.

[0011] As a preferred solution of the present invention, a second magnet is arranged on one side of the air pipe close to the exhaust pipe, a sliding groove is arranged in the mounting plate at the exhaust pipe, a sliding plate is slidably installed in the sliding groove, a first magnet adapted to the second magnet is arranged at one end of the sliding plate, a first spring is connected between the other end of the sliding plate and the sliding groove, an air vent adapted to the exhaust pipe is penetrated through the sliding plate, and the passage and closure of the exhaust pipe are controlled by sliding of the sliding plate in the sliding groove.

[0012] As a preferred solution of the present invention, the box body includes an outer shell, an inner shell is arranged inside the outer shell, and a sound insulation layer is arranged between the outer shell and the inner shell.

[0013] As a preferred solution of the present invention, a mounting groove adapted to the lifting plate is provided on the upper end surface of the mounting plate, a second spring is installed on the outer wall of the air pipe between the lifting plate and the mounting groove, inclined wedge blocks are provided on both sides of the lifting plate, and an electric telescopic rod with an output end adapted to the inclined wedge blocks is provided on the edges of both sides of the mounting groove on the upper end surface of the mounting plate.

[0014] As a preferred solution of the present invention, it also includes a cleaning device, which includes a movable cleaning frame slidably installed in the box and adapted to the inner wall of the box, and the inner wall of the box is cleaned by driving the movable cleaning frame to slide back and forth in the box.

[0015] As a preferred solution of the present invention, the movable cleaning frame is in an approximate "n" shape, and connecting seats are provided on both sides of the bottom of the movable cleaning frame. A reciprocating screw is rotatably installed in the connecting seat with the sliding direction of the movable cleaning frame as the rotating axis, and the reciprocating screw is connected to the power device.

[0016] As a preferred solution of the present invention, the power device comprises a pair of spaced mounting seats, a rotating shaft is rotatably mounted between the mounting seats, a rotating part is arranged in the middle of the rotating shaft, blades adapted to the air outlet are arranged at annular intervals on the outer wall of the rotating part, and both ends of the rotating shaft pass through the mounting seats and are connected to the reciprocating screw through a gear transmission mechanism. The beneficial effects of the present invention are:

[0017] 1. Through the setting and coordination of frequency converters, variable frequency compressors and other devices, the system can control the compressor speed, thereby adjusting the flow and pressure of the refrigerant to achieve control of the refrigeration temperature, so that the system can adjust the cooling capacity and operating efficiency according to actual needs, avoiding energy waste caused by fixed flow and pressure in traditional cooling systems.

[0018] 2. Through the setting and coordination of the box body, the lifting switch part and the vacuum exhaust part, on the one hand, the vacuum exhaust part can be used to extract the gas inside the box body to form a vacuum environment, thereby improving the sound insulation effect; on the other hand, when the temperature of the variable frequency compressor rises and needs to be dissipated, the cold air in the heat exchange room can be sucked into the box body through the control of the lifting switch part and the vacuum environment inside the box body, thereby completing the heat dissipation and cooling of the variable frequency compressor, and then the vacuum exhaust part is used to extract the gas in the box body to form a vacuum environment and enter the sound insulation state; so that the system can adopt closed sound insulation to improve the sound insulation effect without affecting the heat dissipation and cooling of the variable frequency compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side structural schematic diagram of the present invention.

[0020] Figure 2 It is a rear cross-sectional structural schematic diagram of the present invention.

[0021] Figure 3 It is a schematic diagram of a top view and a partial cross-sectional structure of the present invention.

[0022] Figure 4 It is a side cross-sectional structural schematic diagram of the present invention.

[0023] Figure 5 It is a schematic diagram of the partial cross-sectional structure of the present invention from a rear view.

[0024] Figure 6 It is a schematic diagram of a top view and a cross-sectional structure of a box body of the present invention.

[0025] Figure 7 It is a schematic diagram of the enlarged structure of the vacuum state at position A of the present invention.

[0026] Figure 8 It is an enlarged structural schematic diagram of the air intake state at position A of the present invention.

[0027] Fig. 9 It is a schematic diagram of the enlarged structure of B of the present invention.

[0028] The text labels in the figure are as follows: 1. Mounting plate; 11. Mounting slot; 2. Condenser; 3. Variable frequency condensing fan; 4. Heat exchange chamber; 41. Connecting plate; 42. Evaporator; 43. Variable frequency evaporating fan; 5. Box; 51. Outer shell; 52. Sound insulation layer; 53. Inner shell; 6. Inverter; 7. Vacuum exhaust section; 71. Vacuum pump; 72. Exhaust pipeline; 73. Sliding plate; 74. First magnet; 75. Ventilation hole; 76. Sliding slot; 77. First spring; 8. Variable frequency pressure compressor; 9, lifting switch part; 91, air pipe; 92, lifting plate; 93, inclined wedge block; 94, air outlet; 95, air inlet; 96, extended sealing edge; 97, electric telescopic rod; 98, second magnet; 99, second spring; 10, cleaning device; 101, rotating part; 102, blade; 103, rotating shaft; 104, mounting seat; 105, gear transmission mechanism; 106, connecting seat; 107, reciprocating screw rod; 108, movable cleaning frame. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0030] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0031] like Figure 1-9As shown, a variable frequency refrigeration system applied to a small unit air-cooled freezer comprises a variable frequency compressor 8 and a frequency converter 6, wherein the variable frequency compressor 8 is mounted on the upper end surface of a mounting plate 1, a heat exchange chamber 4 is arranged at the lower end of the mounting plate 1, a box body 5 which completely covers the outside of the variable frequency compressor 8 is arranged on the upper end surface of the mounting plate 1, and the variable frequency compressor 8 is soundproofed by the box body, a lifting switch part 9 is arranged inside the box body 5, and a vacuum exhaust part 7 is arranged on one side of the outside of the box body 5; the lifting switch part 9 comprises a lifting plate 92 which is slidably mounted on the upper end surface of the mounting plate 1 up and down, and air pipes 91 whose lower ends pass through the mounting plate 1 and extend into the heat exchange chamber 4 are arranged at intervals on the lifting plate 92, and the air pipes 91 are hollow inside ... The upper end of the tube 91 is provided with air outlet holes 94 at intervals, and the lower part of the side wall of the air pipe 91 is provided with air inlet holes 95 at annular intervals. The upward and downward sliding stroke of the lifting plate 92 is limited by the height position of the air inlet hole 95 at the lower part of the side wall of the air pipe 91; that is, when the lifting plate 92 is lowered to the bottom, the air inlet hole 95 is exposed, and the air pipe 91 starts to ventilate; when the lifting plate 92 is raised to the top, the air inlet hole 95 is blocked, and the air pipe 91 is closed and no longer ventilated; the vacuum exhaust part 7 includes a vacuum pump 71, and the mounting plate 1 is provided with an exhaust pipeline 72 connected to the bottom of the box body 5. The exhaust end of the vacuum pump 71 is connected to the exhaust pipeline 72 through a connecting pipe, that is, starting the vacuum pump 71 can exhaust air from the box body 5, so that a vacuum environment is formed in the box body 5.

[0032] like Figure 1-3 As shown, further, a condenser 2 is provided at the upper end of the mounting plate 1, a variable frequency condensing fan 3 is provided on one side of the condenser 2, the heat exchange chamber 4 is connected to the bottom of the mounting plate 1 through a top connecting plate 41, an evaporator 42 is provided in the heat exchange chamber 4, and a variable frequency evaporating fan 43 is provided at the bottom of the heat exchange chamber 4 on one side of the evaporator 42.

[0033] Specifically, through the arrangement of the condenser 2, the variable frequency condensing fan 3, the evaporator 42, and the variable frequency evaporating fan 43, in coordination with the variable frequency compressor 8 and the frequency converter 6 of the system, a variable frequency refrigeration system is formed, that is, through the variable frequency refrigeration control of each variable frequency refrigeration element, the refrigeration temperature in the heat exchange chamber 4 can be controlled, thereby realizing the variable frequency refrigeration of the system.

[0034] like Figure 1-3As shown, further, a temperature sensor and a pressure sensor are provided in the variable frequency compressor 8, a temperature sensor is provided in the condenser 2 and the evaporator 42, the frequency converter 6 is electrically connected to each sensor (the sensor is a conventional sensing technology, belonging to the prior art, and is not drawn in the figure), and the frequency converter 6 is electrically connected to the variable frequency condensing fan 3, the variable frequency evaporating fan 43 and the variable frequency compressor 8. The frequency converter 6 receives signals from each sensor and then processes the signals. The frequency converter 6 performs variable frequency control on the variable frequency condensing fan 3, the variable frequency evaporating fan 43 and the variable frequency compressor 8 according to the processing results.

[0035] Specifically, the frequency converter 6 is used to integrate the detection and control frequency conversion modules, and the rotation speeds of the frequency conversion compressor 8 and the fan are adjusted accordingly according to the received temperature and pressure signals, thereby adjusting and controlling the refrigeration temperature in the heat exchange chamber 4 .

[0036] like Figure 7 , Figure 8 As shown, further, the bottom of the air pipe 91 passes through the connecting plate 41 and is provided with an extended sealing edge 96 , and a sealing pad adapted to the bottom of the connecting plate 41 is provided on the extended sealing edge 96 .

[0037] Specifically, by setting the extended sealing edge 96 to serve as a height limit for the lifting of 91, when the box body 5 is in a vacuum state, the air pressure in the heat exchange chamber 4 will press the extended sealing edge 96 and the bottom of the connecting plate 41 tightly to fit together, and the sealing effect of the lifting switch part 9 is further improved in combination with the sealing gasket.

[0038] like Figure 7 , Figure 8 As shown, further, a second magnet 98 is provided on one side of the air pipe 91 near the exhaust pipe 72, a sliding groove 76 is provided in the mounting plate 1 at the exhaust pipe 72, a sliding plate 73 is slidably installed in the sliding groove 76, a first magnet 74 adapted to the second magnet 98 is provided at one end of the sliding plate 73, the first magnet 74 and the second magnet 98 are mutually N or S poles and have magnetic attraction, a first spring 77 is connected between the other end of the sliding plate 73 and the sliding groove 76, the travel tension of the first spring 77 during the sliding plate 73 in the sliding groove 76 is less than the maximum magnetic attraction between the first magnet 74 and the second magnet 98, an air vent 75 adapted to the exhaust pipe 72 is provided throughout the sliding plate 73, and the passage and closure of the exhaust pipe 72 are controlled by the sliding of the sliding plate 73 in the sliding groove 76.

[0039] Specifically, when the lifting plate 92 is raised, that is, the lifting switch part 9 is in the closed state, the second magnet 98 on the side of the air pipe 91 is also in the raised state, aligned with the first magnet 74, and the maximum magnetic attraction force is generated between the two. The magnetic attraction force pulls the sliding plate 73 to slide in the sliding groove 76 in the direction close to the second magnet 98 until the first magnet 74 and the second magnet 98 are in contact with each other, and the air vent 75 in the sliding plate 73 is aligned with the exhaust pipe 72, so that the exhaust pipe 72 opens the passage; when the lifting plate 92 is lowered, that is, the lifting switch part 9 is in the open and closed state, the second magnet 98 on the side of the air pipe 91 is lowered and separated from the first magnet 74, resulting in the pullback force of the first spring 77 being greater than the magnetic attraction force between the two magnets, and pulling the sliding plate 73 to slide in the direction away from the second magnet 98 until the air vent 75 in the sliding plate 73 is completely removed from the exhaust pipe 72, and the exhaust pipe 72 is sealed by the sliding plate 73, so that the exhaust pipe 72 air path is closed.

[0040] like Figure 6 As shown, further, the box body 5 includes an outer shell 51, an inner shell 53 is arranged inside the outer shell 51, a sound insulation layer 52 is arranged between the outer shell 51 and the inner shell 53, and the sound insulation layer 52 is made of sound insulation material.

[0041] Specifically, the sound insulation material in this embodiment is a sound insulation fiberboard. The sound insulation effect of the box body 5 is further improved by the layering of the box body 5 and the provision of the sound insulation layer 52 .

[0042] like Figure 7 , Figure 8 As shown, further, a mounting groove 11 adapted to the lifting plate 92 is provided at the upper end surface of the mounting plate 1, a second spring 99 is installed on the outer wall of the air pipe 91 between the lifting plate 92 and the mounting groove 11, and inclined wedge blocks 93 are provided on both sides of the lifting plate 92. The upper end surface of the mounting plate 1 is provided with an electric telescopic rod 97 whose output end is adapted to the inclined wedge block 93 at the edge of both sides of the mounting groove 11.

[0043] Specifically, when the output end of the electric telescopic rod 97 is extended, it will hit the inclined wedge block 93. The inclined wedge blocks 93 on both sides of the lifting plate 92 will convert the thrust received in the horizontal direction into a downward thrust according to the action of the inclined surface, and push the lifting plate 92 to move downward and compress the second spring 99; when the output end of the electric telescopic rod 97 is retracted, the inclined wedge block 93 loses its supporting force, and the compressed second spring 99 will provide the lifting plate 92 with an upward thrust and move it upward until it recovers, that is, the lifting and lowering activities of the lifting plate 92 are controlled by the electric telescopic rod 97.

[0044] like Figure 3-6As shown, further, it also includes a cleaning device 10, which includes a movable cleaning frame 108 that is slidably installed in the box body 5 and adapted to the inner wall of the box body 5, and a cleaning cloth with water absorption performance is provided on the contact surface between the cleaning frame 108 and the inner wall of the box body 5. The movable cleaning frame 108 is driven to slide back and forth in the box body 5 to clean the inner wall of the box body 5, absorb condensed water and wipe the side wall.

[0045] like Figure 5-9 As shown, further, the movable cleaning frame 108 is in an approximate "n" shape, and connecting seats 106 are arranged on both sides of the bottom of the movable cleaning frame 108. A reciprocating screw 107 is rotatably installed in the connecting seat 106 with the sliding direction of the movable cleaning frame 108 as the rotation axis. The connecting seat 106 and the reciprocating screw 107 are threadedly connected, and the reciprocating screw 107 is connected to the power device. When the reciprocating screw 107 is driven to rotate, the connecting seat 106 will be driven to move along the axial direction of the screw, and the connecting seat 106 will drive the cleaning frame 108 connected thereto to reciprocate.

[0046] like Figure 5-9 As shown, further, the power device includes a pair of spaced mounting seats 104, a rotating shaft 103 is rotatably mounted between the mounting seats 104, a rotating portion 101 is provided in the middle of the rotating shaft 103, and blades 102 adapted to the air outlet 94 are provided on the outer wall of the rotating portion 101 at annular intervals, and both ends of the rotating shaft 103 respectively pass through the mounting seats 104 and are connected to the reciprocating screw 107 through a gear transmission mechanism 105, that is, the rotation of the rotating shaft 103 can drive the reciprocating screw 107 to rotate through the gear transmission mechanism 105.

[0047] Specifically, when the air inlet 94 of the lifting switch part 9 starts to take in air, the blade 102 above it will be blown, and the blade 102 will rotate around the axial direction of the rotating part 101, and drive the rotating shaft 103 to rotate synchronously. The rotating shaft 103 drives the reciprocating screw 107 connected to it to rotate through the gear transmission mechanism 105. The rotation of the reciprocating screw 107 drives the connecting seat 106 to drive the cleaning frame 108 to start reciprocating linear sliding in the box body 5. During the sliding process of the cleaning frame 108, the inner wall of the box body 5 is cleaned, condensed water is absorbed and the side wall is wiped until the air inlet 94 of the lifting switch part 9 stops taking in air and the cleaning frame 108 stops sliding for cleaning.

[0048] Working principle: When the system is used, the variable frequency compressor 8 is started, and in conjunction with the condenser 2, evaporator 42 and other devices, the cold air is discharged from the air outlet through the variable frequency evaporation fan 43 in the heat exchange chamber 4, and refrigeration begins (the conventional principle of the refrigeration device is the prior art and will not be described in detail). The inverter 6 performs variable frequency refrigeration control on each variable frequency refrigeration element, and can receive the sensing signals transmitted to the inverter 6 by each temperature and pressure sensor, and control the refrigeration temperature in the heat exchange chamber 4, that is, the inverter 6 is used to integrate the detection and control frequency conversion modules, and the speed of the variable frequency compressor 8, the variable frequency condensation fan 3 and the variable frequency evaporation fan 43 is adjusted accordingly according to the received temperature and pressure signals, so as to adjust and control the refrigeration temperature in the heat exchange chamber 4 to realize the variable frequency refrigeration of the system. During the operation of the system, the noise generated by the operation of the variable frequency compressor 8 is sealed and isolated by the box 5 and the vacuum environment in the box 5, which effectively reduces the working noise of the system.

[0049] During this process, when it is detected that the temperature of the variable frequency compressor 8 rises and needs to be cooled, the output end of the electric telescopic rod 97 is controlled to extend, and the output end will hit the inclined wedge block 93. The inclined wedge blocks 93 on both sides of the lifting plate 92 will convert the thrust received in the horizontal direction into a downward thrust according to the action of the inclined surface, and push the lifting plate 92 to move downward and compress the second spring 99; when the lifting plate 92 drops to the bottom, the lifting switch part 9 is in an open and closed state, the air inlet 95 is exposed from the connecting plate 41, and the air pipe 91 begins to ventilate. Affected by the atmospheric pressure, the cold air in the heat exchange chamber 4 will enter from the air inlet 95 of the air pipe 91 and be discharged from the air outlet 94 to the box body 5, cooling the variable frequency compressor 8. The second magnet 98 on one side of the air pipe 91 moves downward with the descent of the air pipe 91 and separates from the first magnet 74, causing the pullback force of the first spring 77 to be greater than the magnetic attraction between the two magnets, and pulls the sliding plate 73 to slide in a direction away from the second magnet 98 until the air vent 7 in the sliding plate 73 is opened. 5 completely removes the exhaust pipe 72, and the exhaust pipe 72 is sealed by the sliding plate 73, so that the exhaust pipe 72 is closed, and the gas filled into the box body 5 causes the air pressure to be suddenly restored, which will not affect the valve body inside the exhaust end of the vacuum pump 71; at the same time, when the air inlet hole 94 starts to take in air, the blade 102 above it will be blown, and the blade 102 will rotate around the axial direction of the rotating part 101, and drive the rotating shaft 103 to rotate synchronously, and the rotating shaft 103 drives the rotating shaft 103 to rotate synchronously with the rotating shaft 103 through the gear transmission mechanism 105. The reciprocating screw 107 connected thereto rotates, and the rotation of the reciprocating screw 107 drives the connecting seat 106 to drive the cleaning frame 108 to start reciprocating linear sliding in the box body 5. During the sliding process of the cleaning frame 108, the inner wall of the box body 5 is cleaned, condensed water generated by the combination of cold and heat is absorbed, and the side wall is wiped until the air pressure in the box body 5 returns to normal, the air inlet 94 of the lifting switch part 9 stops taking in air, the rotating part 101 stops rotating, and the cleaning frame 108 also stops sliding for cleaning.

[0050] When it is detected that the temperature of the variable frequency compressor 8 has dropped and heat dissipation and cooling are no longer needed, the output end of the electric telescopic rod 97 is controlled to retract, the inclined wedge block 93 loses its supporting force, and the compressed second spring 99 provides an upward thrust for the lifting plate 92 and moves upward until it recovers; the lifting plate 92 rises upward, and the air inlet 95 is retracted into the connecting plate 41 and blocked, that is, the lifting switch part 9 is in a closed state, and the air pipe 91 is closed and no air is ventilated; the second magnet 98 on one side of the air pipe 91 also moves with the air pipe 91 The sliding plate 73 rises and rises until it is aligned with the first magnet 74, and the maximum magnetic attraction is generated between the two. The magnetic attraction pulls the sliding plate 73 to slide in the sliding groove 76 toward the second magnet 98 until the first magnet 74 and the second magnet 98 fit each other, and the air vent 75 in the sliding plate 73 is aligned with the exhaust pipe 72, so that the exhaust pipe 72 opens the passage; the vacuum pump 71 is started, and the exhaust end of the vacuum pump 71 exhausts air from the exhaust pipe 72 in the box body 5, so that a vacuum environment is re-formed in the box body 5.

[0051] In the above-mentioned whole process, the system controls the speed of the compressor through the arrangement and coordination of the frequency converter 6, the frequency conversion compressor 8 and other devices, thereby adjusting the flow and pressure of the refrigerant to realize the control of the refrigeration temperature, so that the system can adjust the cooling capacity and operating efficiency according to actual needs, avoiding the energy waste caused by the fixed flow and pressure in the traditional cooling system; through the arrangement and coordination of the box body 5, the lifting switch part 9 and the vacuum exhaust part 7, on the one hand, the vacuum exhaust part 7 can be used to extract the gas inside the box body 5 to form a vacuum environment, thereby improving the sound insulation effect; on the other hand, when the temperature of the frequency conversion compressor 8 rises and needs to dissipate heat, the lifting switch part 9 can be controlled to cooperate with the box body to increase the temperature. 5, the cold air in the heat exchange chamber 4 is sucked into the box body 5 to complete the heat dissipation and cooling of the variable frequency compressor 8, and then the vacuum exhaust unit 7 is used to extract the gas in the box body 5 to form a vacuum environment and enter the sound insulation state; so that the system can adopt closed sound insulation to improve the sound insulation effect without affecting the heat dissipation and cooling of the variable frequency compressor 8; through the setting of the cleaning device 10 in the box body 5, the air intake process of the lifting switch unit 9 is coordinated to provide power, and the cleaning frame 108 is driven to slide back and forth in the box body 5 to wipe off the condensed water generated by the hot and cold changes in the box body 5, so that the system can avoid the adverse effects caused by the accumulation of condensed water in the box body 5, and further has the effect of convenient cleaning.

[0052] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A variable frequency refrigeration system for a small unit air-cooled freezer, comprising a variable frequency compressor (8) and a frequency converter (6), characterized in that: The variable frequency compressor (8) is mounted on the upper end surface of the mounting plate (1); a heat exchange chamber (4) is provided at the lower end of the mounting plate (1); a box body (5) that completely covers the outside of the variable frequency compressor (8) is provided on the upper end surface of the mounting plate (1); a lifting switch unit (9) is provided inside the box body (5); and a vacuum exhaust unit (7) is provided on one side of the box body (5); The lifting switch part (9) comprises a lifting plate (92) mounted on the upper end surface of the mounting plate (1) in a sliding manner up and down, an air pipe (91) is arranged at intervals on the lifting plate (92), the lower end of which passes through the mounting plate (1) and extends into the heat exchange chamber (4), an air outlet hole (94) is arranged at the upper end of the air pipe (91), and air inlet holes (95) are arranged at annular intervals at the lower part of the side wall of the air pipe (91), and the upward and downward sliding stroke of the lifting plate (92) is limited by the height position of the air inlet hole (95) at the lower part of the side wall of the air pipe (91); The vacuum exhaust section (7) comprises a vacuum pump (71); an exhaust pipeline (72) connected to the box body (5) is provided in the mounting plate (1); and an exhaust end of the vacuum pump (71) is connected to the exhaust pipeline (72) via a connecting pipe.

2. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 1, characterized in that: A condenser (2) is arranged at the upper end of the mounting plate (1), a variable frequency condensing fan (3) is arranged on one side of the condenser (2), the heat exchange chamber (4) is connected to the bottom of the mounting plate (1) via a connecting plate (41) at the top, an evaporator (42) is arranged in the heat exchange chamber (4), and a variable frequency evaporating fan (43) is arranged at the bottom of the heat exchange chamber (4) on one side of the evaporator (42).

3. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 2 is characterized in that: The variable frequency compressor (8) is provided with a temperature sensor and a pressure sensor, the condenser (2) and the evaporator (42) are provided with temperature sensors, the variable frequency drive (6) is electrically connected to the sensors, the variable frequency drive (6) is electrically connected to the variable frequency condensing fan (3), the variable frequency evaporating fan (43) and the variable frequency compressor (8), and the variable frequency drive (6) performs variable frequency control on the variable frequency condensing fan (3), the variable frequency evaporating fan (43) and the variable frequency compressor (8) by receiving signals from the sensors.

4. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 2, characterized in that: The bottom of the air pipe (91) passes through the connecting plate (41) and is provided with an extended sealing edge (96), and a sealing pad adapted to the bottom of the connecting plate (41) is provided on the extended sealing edge (96).

5. A variable frequency refrigeration system for a small unit air-cooled freezer according to any one of claims 1 to 4, characterized in that: A second magnet (98) is arranged on one side of the air pipe (91) near the exhaust pipe (72), a sliding groove (76) is arranged in the mounting plate (1) at the exhaust pipe (72), a sliding plate (73) is slidably installed in the sliding groove (76), a first magnet (74) adapted to the second magnet (98) is arranged at one end of the sliding plate (73), a first spring (77) is connected between the other end of the sliding plate (73) and the sliding groove (76), a vent hole (75) adapted to the exhaust pipe (72) is arranged through the sliding plate (73), and the passage and closure of the exhaust pipe (72) are controlled by sliding the sliding plate (73) in the sliding groove (76).

6. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 5, characterized in that: The box body (5) comprises an outer shell (51), an inner shell (53) is arranged inside the outer shell (51), and a sound insulation layer (52) is arranged between the outer shell (51) and the inner shell (53).

7. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 5, characterized in that: The upper end surface of the mounting plate (1) is provided with a mounting groove (11) adapted to the lifting plate (92); a second spring (99) is installed on the outer wall of the air pipe (91) between the lifting plate (92) and the mounting groove (11); inclined wedge blocks (93) are provided on both sides of the lifting plate (92); and the upper end surface of the mounting plate (1) is provided with an electric telescopic rod (97) whose output end is adapted to the inclined wedge blocks (93) at the edges of both sides of the mounting groove (11).

8. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 1, characterized in that: The cleaning device (10) further comprises a cleaning device (10), wherein the cleaning device (10) comprises a movable cleaning frame (108) slidably mounted in the box body (5) and adapted to the inner wall of the box body (5), and the inner wall of the box body (5) is cleaned by driving the movable cleaning frame (108) to slide back and forth in the box body (5).

9. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 8, characterized in that: The movable cleaning frame (108) is in the shape of an "N" letter. Connecting seats (106) are provided on both sides of the bottom of the movable cleaning frame (108). A reciprocating screw (107) is rotatably mounted in the connecting seat (106) with the sliding direction of the movable cleaning frame (108) as the rotation axis. The reciprocating screw (107) is connected to a power device.

10. The variable frequency refrigeration system for small unit air-cooled freezer according to claim 9, characterized in that: The power device comprises a pair of mounting seats (104) arranged at intervals, a rotating shaft (103) being rotatably mounted between the mounting seats (104), a rotating portion (101) being arranged in the middle of the rotating shaft (103), blades (102) adapted to the air outlet holes (94) being arranged at annular intervals on the outer wall of the rotating portion (101), and two ends of the rotating shaft (103) respectively passing through the mounting seats (104) and being transmission-connected to a reciprocating screw rod (107) via a gear transmission mechanism (105).

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