Refrigerated cabinet capable of uniformly discharging air, preventing freezing and thawing and prolonging freshness of food materials

Abstract

The utility model provides a refrigerated cabinet capable of uniformly discharging air, preventing freezing and melting and prolonging freshness of food materials. The refrigerated cabinet comprises a cabinet body, and a refrigeration assembly is installed in the cabinet body; the refrigeration assembly comprises a compressor, a steam-water separator, a first conveying pipe, a liquid storage tank, a condenser, an evaporator and an air return pipe. An outlet of the compressor communicates with an inlet of the condenser through a first conveying pipe. When the air outlet temperature is far higher than the set temperature, the load required by the system is increased, the rotating speed of the compressor is increased, the opening degree of the electronic expansion valve is increased, the rotating speed of the fan is increased, the refrigerating capacity of the system is improved, and the display cabinet reaches the required temperature as soon as possible, so that the air outlet temperature is uniform; when the difference value between the air outlet temperature and the set temperature is small, the required cooling capacity of the display cabinet is small, at the moment, the rotating speed of the compressor is decreased, the set temperature maintained by the electronic expansion valve is adjusted to the corresponding opening degree, the rotating speed of the draught fan is decreased, the refrigerating capacity and the thermal load of the display cabinet are kept consistent, and the purpose that the air outlet temperature is uniform is achieved.

Description

Technical Field

[0001] This utility model relates to a refrigerator, specifically a refrigerator with uniform airflow to prevent freezing and thawing and extend the freshness of food, belonging to the field of refrigerator technology. Background Technology

[0002] The refrigeration system is the core component of a refrigerated display case, responsible for maintaining a low-temperature environment inside to ensure the freshness of the displayed items. This system mainly consists of a compressor, condenser, expansion valve, and evaporator, which work together to achieve a refrigeration cycle.

[0003] Currently, most refrigerated display cases on the market use a fixed-frequency capillary refrigeration system with the evaporation temperature set below 0℃ and a timed defrosting system. With the evaporation temperature below 0℃, prolonged operation can lead to the air outlet temperature remaining below 0℃, potentially freezing fruits and vegetables near the air outlet or causing meat to freeze. Furthermore, the timed defrosting process raises the temperature, causing repeated freezing and thawing, resulting in cell dehydration and affecting food preservation. The alternating cooling and defrosting cycles also cause fluctuations in the air outlet temperature, impacting the overall temperature and food preservation. Additionally, most refrigerated display cases on the market use fixed-frequency fans. This results in excessive airflow at low loads, increasing food dehydration, and insufficient airflow at high loads, leading to higher overall temperatures. Therefore, a refrigerated display case with uniform airflow, freeze-thaw prevention, and extended food preservation is proposed. Utility Model Content

[0004] In view of this, the present invention provides a refrigerator with uniform airflow, freeze-thaw protection, and extended food preservation, so as to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0005] The technical solution of this utility model embodiment is implemented as follows: a refrigerator with uniform airflow, anti-freeze and anti-thaw effect, and extended food preservation, includes a cabinet body, and a refrigeration component is installed inside the cabinet body;

[0006] The refrigeration assembly includes a compressor, a vapor-liquid separator, a first delivery pipe, a liquid storage tank, a condenser, a second delivery pipe, a liquid inlet pipe, an evaporator, and a return gas pipe;

[0007] The compressor outlet is connected to the condenser inlet via a first delivery pipe, the condenser outlet is connected to the liquid inlet of the liquid storage tank via a second delivery pipe, the liquid outlet of the liquid storage tank is connected to the evaporator inlet via an inlet pipe, the evaporator outlet is connected to the vapor separator via a return pipe, the vapor separator outlet is connected to the compressor inlet via a pipe, an electronic expansion valve is installed on the inlet pipe, an evaporator fan is installed on the inner top wall of the cabinet, and a condenser fan is installed on the inner rear wall of the cabinet.

[0008] More preferably, the compressor, vapor-water separator, liquid storage tank, condenser, and evaporator are all installed inside the cabinet.

[0009] More preferably, a temperature sensor and a pressure sensor are respectively installed on the return air pipe.

[0010] More preferably, a dryer filter and a sight glass are installed on the liquid inlet pipe.

[0011] More preferably, the sight glass is located between the dryer filter and the electronic expansion valve.

[0012] More preferably, the upper surface of the cabinet is equipped with a display rack and an outer shell.

[0013] More preferably, the front surface of the housing is fitted with a cabinet door.

[0014] More preferably, the outer casing is located outside the display rack.

[0015] The present invention has the following advantages due to the adoption of the above technical solution:

[0016] When the outlet air temperature is much higher than the set temperature, the system load demand increases. At this time, the compressor speed increases, the electronic expansion valve opening increases, and the fan speed increases, thereby increasing the system's cooling capacity and enabling the display cabinet to reach the required temperature as quickly as possible, thus ensuring uniform outlet air temperature. When the difference between the outlet air temperature and the set temperature is small, the cooling capacity demanded by the display cabinet is smaller. At this time, the compressor speed decreases, the electronic expansion valve maintains the set temperature and adjusts to the corresponding opening, and the fan speed decreases, so that the cooling capacity is consistent with the heat load of the display cabinet, achieving the purpose of uniform outlet air temperature. Compared with the prior art, this invention uses the coordinated control of electronic expansion valve + variable frequency compressor + variable frequency fan to accurately control the evaporation temperature at the required temperature, avoiding freeze-thaw cycles and water loss of food that affect food preservation. The use of variable frequency fan adjusts the fan speed according to actual needs, thereby saving energy and avoiding the impact of excessive noise caused by the fan running at high speed continuously.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an overall structural diagram of the present invention;

[0020] Figure 2 This is a structural diagram of the cabinet of this utility model;

[0021] Figure 3 This is a first-view view of the refrigeration component of this utility model;

[0022] Figure 4 This is a second-view view of the refrigeration component of this utility model.

[0023] Reference numerals: 101, Refrigeration component; 11, Compressor; 12, Vapor-water separator; 13, First delivery pipe; 14, Liquid receiver; 15, Condenser; 16, Second delivery pipe; 17, Liquid inlet pipe; 18, Temperature sensor; 19, Pressure sensor; 20, Evaporator; 21, Return gas pipe; 23, Dryer filter; 24, Sight glass; 25, Electronic expansion valve; 31, Cabinet; 32, Display rack; 33, Outer shell; 34, Evaporator fan; 35, Condenser fan; 36, Cabinet door. Detailed Implementation

[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1-4 As shown, this utility model embodiment provides a refrigerator with uniform airflow, freeze-thaw protection, and extended food preservation, including a cabinet body 31, and a refrigeration component 101 installed inside the cabinet body 31;

[0027] The refrigeration assembly 101 includes a compressor 11, a vapor-liquid separator 12, a first delivery pipe 13, a liquid storage tank 14, a condenser 15, a second delivery pipe 16, a liquid inlet pipe 17, an evaporator 20, and a return gas pipe 21.

[0028] The outlet of compressor 11 is connected to the inlet of condenser 15 via the first delivery pipe 13. The outlet of condenser 15 is connected to the inlet of liquid receiver 14 via the second delivery pipe 16. The outlet of liquid receiver 14 is connected to the inlet of evaporator 20 via the inlet pipe 17. The outlet of evaporator 20 is connected to steam separator 12 via the return pipe 21. The outlet of steam separator 12 is connected to the inlet of compressor 11 via a pipe. An electronic expansion valve 25 is installed on the inlet pipe 17. An evaporator fan 34 is installed on the inner top wall of the cabinet 31, and a condenser fan 35 is installed on the inner rear wall of the cabinet 31. During operation, the gaseous refrigerant is discharged to the condenser 15 via the compressor 11. The condenser 15 exchanges heat with the environment and changes from a gaseous state to a liquid state. The liquid refrigerant passes through the liquid storage tank 14 and the dryer filter 23 to the electronic expansion valve 25. The pressure is reduced by the electronic expansion valve 25 and it reaches the evaporator 20. The refrigerant changes from a liquid state to a gaseous state and absorbs heat in the evaporator 20, thereby reducing the temperature inside the display cabinet.

[0029] Then the gaseous refrigerant flows from the evaporator 20 into the return pipe 21, then through the return pipe 21 into the steam-water separator 12, and finally back to the compressor 11.

[0030] In one embodiment, the compressor 11, the vapor-water separator 12, the liquid storage tank 14, the condenser 15, and the evaporator 20 are all installed inside the cabinet 31, thereby defining the position of the refrigeration assembly 101 through the cabinet 31.

[0031] In one embodiment, a temperature sensor 18 and a pressure sensor 19 are respectively installed on the return pipe 21. The temperature sensor 18 is used to monitor the temperature of the gaseous refrigerant in the return pipe 21, and the pressure sensor 19 is used to monitor the pressure in the return pipe 21.

[0032] In one embodiment, a dryer filter 23 and a sight glass 24 are respectively installed on the inlet pipe 17; the sight glass 24 is located between the dryer filter 23 and the electronic expansion valve 25.

[0033] During operation, the cooling capacity of compressor 11 is kept consistent with the load of the display cabinet by adjusting the difference between the outlet air temperature and the set temperature in real time, thereby keeping the temperature inside the display cabinet constant.

[0034] The compressor 11 is a variable frequency compressor. In combination with the speed change of the compressor 11, the electronic expansion valve 25 is used as the throttling element of the system. By controlling the opening of the electronic expansion valve 25 in real time, the evaporation temperature is precisely controlled at the set value, so as to avoid excessive fluctuation of the outlet air temperature due to the fluctuation of the evaporation temperature, and to avoid the food freezing due to the low temperature or the food losing moisture due to the high temperature.

[0035] Both the condenser fan 35 before the condenser 15 and the evaporator fan 34 before the evaporator 20 are variable frequency fans. The fan speed is controlled by the difference between the outlet air temperature and the set temperature. When the outlet air temperature is much higher than the set temperature, the system load demand increases. At this time, the compressor 11 speed increases, the electronic expansion valve 25 opening increases, and the fan speed increases, thereby increasing the system cooling capacity and enabling the display cabinet to reach the required temperature as soon as possible, thus ensuring uniform outlet air temperature. When the difference between the outlet air temperature and the set temperature is small, the cooling capacity demand of the display cabinet is small. At this time, the compressor 11 speed decreases, the electronic expansion valve 25 maintains the set temperature and adjusts to the corresponding opening, and the fan speed decreases, so that the cooling capacity is consistent with the heat load of the display cabinet, achieving the purpose of uniform outlet air temperature.

[0036] In one embodiment, a display rack 32 and an outer shell 33 are installed on the upper surface of the cabinet 31. A cabinet door 36 is installed on the front surface of the outer shell 33. The outer shell 33 is located outside the display rack 32 and is used to close the display rack 32 to achieve the purpose of refrigeration. A temperature monitoring device is also installed inside the cabinet 31 to monitor the air outlet temperature of the evaporator fan 34 of the refrigeration cabinet in real time.

[0037] In this utility model, the compressor 11, the steam-water separator 12, the liquid storage tank 14, the condenser 15, the evaporator 20, the condenser fan 35, and the evaporator fan 34 are all existing technologies, so their internal structure, working principle, connection, and control method will not be described in detail.

[0038] When this utility model is in operation: the gaseous refrigerant is discharged from the compressor 11 to the condenser 15, where it exchanges heat with the environment and changes from gaseous to liquid. The liquid refrigerant passes through the liquid storage tank 14 and the dryer filter 23 to the electronic expansion valve 25. After the pressure is reduced by the electronic expansion valve 25, it reaches the evaporator 20, where the refrigerant changes from liquid to gas and absorbs heat in the evaporator 20, thereby reducing the temperature inside the display case. Then, the gaseous refrigerant flows from the evaporator 20 into the return pipe 21, flows through the return pipe 21 into the steam-water separator 12, and finally returns to the compressor 11.

[0039] Compared to existing technologies, this invention increases the system load demand when the outlet air temperature is much higher than the set temperature. At this time, the compressor 11 speed increases, the electronic expansion valve 25 opening increases, and the fan speed increases, thereby increasing the system's cooling capacity and enabling the display cabinet to reach the required temperature as quickly as possible, thus ensuring uniform outlet air temperature. When the difference between the outlet air temperature and the set temperature is small, the display cabinet's cooling demand is small. At this time, the compressor 11 speed decreases, the electronic expansion valve 25 maintains the set temperature and adjusts to the corresponding opening, and the fan speed decreases, ensuring that the cooling capacity matches the display cabinet's heat load, achieving uniform outlet air temperature.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A refrigeration cabinet capable of prolonging food preservation by uniform air outlet and preventing freeze-thaw, comprising a cabinet body (31), characterized in that: The cabinet (31) is equipped with a refrigeration unit (101); The refrigeration assembly (101) includes a compressor (11), a vapor-water separator (12), a first delivery pipe (13), a liquid storage tank (14), a condenser (15), a second delivery pipe (16), a liquid inlet pipe (17), an evaporator (20), and a return gas pipe (21); The outlet of the compressor (11) is connected to the inlet of the condenser (15) through the first delivery pipe (13). The outlet of the condenser (15) is connected to the inlet of the liquid storage tank (14) through the second delivery pipe (16). The outlet of the liquid storage tank (14) is connected to the inlet of the evaporator (20) through the inlet pipe (17). The outlet of the evaporator (20) is connected to the steam-water separator (12) through the return gas pipe (21). The outlet of the steam-water separator (12) is connected to the inlet of the compressor (11) through a pipe. An electronic expansion valve (25) is installed on the inlet pipe (17). An evaporator fan (34) is installed on the inner top wall of the cabinet (31). A condenser fan (35) is installed on the inner rear wall of the cabinet (31).

2. The uniform air outlet anti-freeze-thawing food preservation prolonging refrigeration cabinet according to claim 1, characterized in that: The compressor (11), steam-water separator (12), liquid storage tank (14), condenser (15) and evaporator (20) are all installed inside the cabinet (31).

3. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 2, characterized in that: A temperature sensor (18) and a pressure sensor (19) are respectively installed on the return air pipe (21).

4. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 3, characterized in that: A dryer filter (23) and a sight glass (24) are respectively installed on the liquid inlet pipe (17).

5. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 4, characterized in that: The sight glass (24) is located between the dryer filter (23) and the electronic expansion valve (25).

6. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 1, characterized in that: The upper surface of the cabinet (31) is equipped with a display rack (32) and an outer shell (33).

7. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 6, characterized in that: The front surface of the outer casing (33) is fitted with a cabinet door (36).

8. The uniform air outlet anti-freeze-thawing prolong food preservation refrigeration cabinet according to claim 7, characterized in that: The outer shell (33) is located outside the display rack (32).

Images