Air curtain cabinet and air curtain thickness control method thereof

Abstract

The present invention belongs to the technical field of refrigeration equipment, and specifically relates to an air curtain cabinet and an air curtain thickness control method thereof. A honeycomb air outlet grille is provided at the air outlet of the refrigerating chamber of the air curtain cabinet, and a fixed sheet metal part is installed at one end of the air outlet close to the front side of the refrigerating chamber, and a telescopic sheet metal part is installed at the end away from the front side of the refrigerating chamber. The honeycomb air outlet grille is connected to the air outlet through the fixed sheet metal part and the telescopic sheet metal part, and the top surface of the honeycomb air outlet grille is flush with the top wall of the refrigerating chamber at the air outlet; one end of the telescopic sheet metal part can be reciprocated and retracted along the width direction of the honeycomb air outlet grille to adjust the air outlet width of the honeycomb air outlet grille. The present invention can adjust the air outlet width of the honeycomb air outlet grille by setting the telescopic sheet metal part at the air outlet, realize the adjustability of the air curtain thickness of the air curtain cabinet, optimize the air curtain performance, reduce the influence of the external environment on the heat penetration of the items in the cabinet, and realize the energy-saving operation of the air curtain cabinet.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration equipment, and in particular relates to an air curtain cabinet and an air curtain thickness control method thereof. Background Art

[0002] Air curtain cabinets are often used to display and sell various foods that need to be refrigerated and preserved, and are widely used in supermarkets, shopping malls and other places. The air curtain cabinet has no cabinet door, and the front side of the cabinet has an opening directly facing the environment; when the air curtain cabinet is in operation, an air curtain is formed at the opening to prevent the hot air in the external environment from entering the air curtain cabinet. However, due to the limitation of the open structure, the temperature in the cabinet is still easily affected by the external environment, resulting in the temperature of the food stored in the cabinet being easily disturbed by the external environment. When the temperature and humidity of the external environment become higher, the heat penetration of the external environment to the food in the cabinet is enhanced, and the temperature of the food in the cabinet rises accordingly, which is easy to cause consequences such as food deterioration; and the thickness of the air curtain plays an important role in isolating the heat penetration of the external environment. The thickness of the air curtain depends on the width of the air outlet. The wider the air outlet, the thicker the air curtain, the better the air curtain's isolation effect on the external environment, and the less mixing of the ambient air with the air curtain; and the wider the air outlet, the greater the air volume of the air outlet, the greater the kinetic energy of the air curtain, the more it can overcome the pressure difference between the inside and outside of the cabinet, and the performance of the air curtain is enhanced. However, the thickness of the air curtain is not necessarily the greater the better, which will cause unnecessary energy consumption. Therefore, how to optimize the performance of the air curtain to reduce the influence of the external environment on the heat penetration of the items in the cabinet, while achieving energy-saving operation of the air curtain cabinet, has become a technical problem that needs to be solved. Summary of the invention

[0003] In view of the deficiencies existing in the related art, the present invention provides an air curtain cabinet and an air curtain thickness control method thereof, aiming to optimize the air curtain performance, reduce the heat penetration effect of the external environment on the items in the cabinet, and realize energy-saving operation of the air curtain cabinet.

[0004] The air curtain cabinet of the present invention comprises a cabinet body, wherein a refrigeration cavity, a cavity and an air duct are arranged in the cabinet body; wherein:

[0005] The front side of the refrigerating chamber is open, and a return air port is provided at the bottom wall near the front side, and an air outlet is provided at the top wall near the front side; a honeycomb air outlet grille is provided at the air outlet, and a fixed sheet metal part is installed at one end of the air outlet near the front side of the refrigerating chamber, and a telescopic sheet metal part is installed at the end away from the front side of the refrigerating chamber. The honeycomb air outlet grille is connected to the air outlet through the fixed sheet metal part and the telescopic sheet metal part, and the top surface of the honeycomb air outlet grille is flush with the top wall of the refrigerating chamber at the air outlet; one end of the telescopic sheet metal part can be reciprocated and retracted along the width direction of the honeycomb air outlet grille to adjust the air outlet width of the honeycomb air outlet grille;

[0006] The cavity is located below the refrigeration cavity and is connected to the refrigeration cavity through the return air port;

[0007] The air duct is arranged around the rear and the top of the refrigerating cavity, one end of the air duct is connected with the cavity, and the other end is connected with the refrigerating cavity through the air outlet.

[0008] The above technical solution, through the setting of telescopic sheet metal parts at the air outlet, can adjust the air outlet width of the honeycomb air outlet grille, realize the adjustability of the air curtain thickness of the air curtain cabinet, and then optimize the air curtain performance, reduce the influence of heat penetration of the external environment on the items in the cabinet, and realize energy-saving operation of the air curtain cabinet.

[0009] In some of the embodiments, the telescopic sheet metal part includes a main body, a connecting part respectively connected to two ends of the main body and folded in reverse, and a supporting part; the connecting part is connected to the top wall of the refrigeration chamber, and the supporting part supports the bottom surface of the honeycomb air outlet grille; the supporting part includes a supporting section and a telescopic section slidably connected to the supporting section, the supporting section is attached to the bottom surface of the honeycomb air outlet grille to support the honeycomb air outlet grille, and the telescopic section can extend out of the supporting section and reciprocate and telescope along the width direction of the honeycomb air outlet grille to adjust the air outlet width of the honeycomb air outlet grille.

[0010] In some of the embodiments, the air curtain cabinet also includes a control system and a driving component electrically connected to the control system; the driving component is also connected to the telescopic section of the telescopic sheet metal part to drive the telescopic section of the telescopic sheet metal part to extend or shorten under the control of the control system.

[0011] In some of the embodiments, multiple temperature sensors are provided in the refrigeration chamber to detect the temperature at various locations in the refrigeration chamber in real time. The control system is electrically connected to the multiple temperature sensors to simultaneously read the detection results of the multiple temperature sensors and automatically obtain the average temperature in the refrigeration chamber.

[0012] The present invention also provides a method for controlling the thickness of an air curtain of the air curtain cabinet, comprising the following steps:

[0013] S1. In the control system, preset the refrigeration chamber temperature threshold T M and temperature tolerance dT M , preset the maximum extension length L of the telescopic section of the telescopic sheet metal max , preset the telescopic step length dL of the telescopic segment, and preset the control time interval t;

[0014] S2, extend the telescopic section of the telescopic sheet metal part out of the supporting section until its extended length L reaches the initial extended length L A ;

[0015] S3, the control system simultaneously reads the detection results of multiple temperature sensors and automatically calculates the average temperature T in the refrigeration chamber R ;

[0016] If T R =T M ±dT M, the current extension length of the telescopic section is kept unchanged;

[0017] If T R <T M -dT M , the telescopic section is extended outward by an amount dL; when the extension length L of the telescopic section reaches L max Then it will no longer stretch out;

[0018] If T R >T M +dT M , determine whether the extension length of the telescopic section is greater than zero; if not, the control system issues an alarm of over-limit regulation; if so, the telescopic section is retracted inward by an amount of dL; when the extension length L of the telescopic section reaches zero, it will no longer retract;

[0019] S4, continue timing, and repeat step S3 after each control time interval t, so that the control system is adjusted according to the average temperature T in the refrigeration chamber. R The extension length L of the telescopic section of the telescopic sheet metal part is adjusted according to the real-time situation.

[0020] The above technical scheme can automatically adjust the extension length of the telescopic section of the telescopic sheet metal according to the real-time temperature conditions in the refrigerated chamber, realize the automatic adjustment of the air outlet width of the air curtain cabinet, that is, the thickness of the air curtain, optimize the performance of the air curtain, keep the temperature in the refrigerated chamber stable, reduce the influence of heat penetration of the external environment on the items in the cabinet, and realize the energy-saving operation of the air curtain cabinet.

[0021] The present invention also provides another method for controlling the thickness of the air curtain of the air curtain cabinet, comprising the following steps:

[0022] S1. In the control system, preset the refrigeration chamber temperature threshold T M and temperature tolerance dT M , preset the maximum extension length L of the telescopic section of the telescopic sheet metal max , preset the telescopic step length dL of the telescopic section, preset the control time interval t, and preset the unit temperature difference value ΔT;

[0023] S2, extend the telescopic section of the telescopic sheet metal part out of the supporting section until its extended length L reaches the initial extended length L A ;

[0024] S3, the control system simultaneously reads the detection results of multiple temperature sensors and automatically calculates the average temperature T in the refrigeration chamber R ;

[0025] If T R =T M ±dT M , the current extension length of the telescopic section is kept unchanged;

[0026] If T R <T M -dT M , then extend the telescopic section outward by an amount of N ex ×dL; when the extension length L of the telescopic section reaches L max After that, it will not extend any further; among them, N ex is the number of steps that the telescopic section extends outward, calculated according to formula (1);

[0027]

[0028] If T R >T M +dT M , determine whether the extension length of the telescopic section is greater than zero; if not, the control system issues an alarm of over-limit regulation; if so, the telescopic section is retracted inward by an amount of N in ×dL; when the extension length L of the telescopic section reaches zero, it will no longer retract; where N in is the number of steps of the telescopic section retracting inward, calculated according to formula (2);

[0029]

[0030] S4, continue timing, and repeat step S3 after each control time interval t, so that the control system is adjusted according to the average temperature T in the refrigeration chamber. R The extension length L of the telescopic section of the telescopic sheet metal part is adjusted according to the real-time situation.

[0031] The above technical scheme can automatically adjust the extension length of the telescopic section of the telescopic sheet metal according to the real-time temperature conditions in the refrigerated cavity, and can specifically adjust the extension or retraction amount according to the temperature difference, thereby realizing automatic adjustment of the air outlet width of the air curtain cabinet, that is, the thickness of the air curtain, further optimizing the performance of the air curtain, keeping the temperature in the refrigerated cavity stable, reducing the influence of heat penetration of the external environment on the items in the cabinet, and realizing energy-saving operation of the air curtain cabinet.

[0032] In some embodiments, the maximum extension length L of the telescopic section of the telescopic sheet metal part max Set according to formula (3);

[0033] L max =c×W B (3);

[0034] In formula (3), W B is the inherent air outlet width of the air outlet, c is the control coefficient, c = 0.2 ~ 0.5.

[0035] Based on the above technical scheme, the air curtain cabinet and the air curtain thickness control method thereof in the embodiment of the present invention, through the setting of the telescopic sheet metal at the air outlet, enable the control system to automatically adjust the air outlet width of the honeycomb air outlet grille according to the real-time temperature conditions in the refrigeration chamber, thereby realizing automatic adjustment of the air curtain thickness of the air curtain cabinet, optimizing the air curtain performance, reducing the influence of heat penetration of the external environment on the items in the cabinet, and realizing energy-saving operation of the air curtain cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 It is a structural schematic diagram of the air curtain cabinet of the present invention;

[0038] Figure 2 for Figure 1 A magnified image of point A;

[0039] Figure 3 It is a flow chart of Embodiment 1 of the method for controlling the thickness of an air curtain cabinet of the present invention;

[0040] Figure 4 This is a flow chart of Embodiment 2 of the air curtain thickness control method of the air curtain cabinet of the present invention.

[0041] In the figure:

[0042] 1. Cabinet; 11. Refrigeration cavity; 12. Cavity; 13. Air duct; 14. Return air outlet; 15. Air outlet; 2. Fan; 3. Evaporator; 4. Honeycomb air outlet grille; 5. Fixed sheet metal parts; 6. Telescopic sheet metal parts; 61. Main body; 62. Connecting part; 63. Support part; 631. Support section; 632. Telescopic section. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] like Figure 1-Figure 2 As shown, the air curtain cabinet of the present invention includes a cabinet body 1, and a refrigeration cavity 11, a cavity 12 and an air duct 13 are arranged in the cabinet body 1. The front side of the refrigeration cavity 11 is open, and a return air port 14 is arranged on the bottom wall of the refrigeration cavity 11 near the front side, and an air outlet 15 is arranged on the top wall of the refrigeration cavity 11 near the front side. The cavity 12 is located below the refrigeration cavity 11, and is connected to the refrigeration cavity 11 through the return air port 14. The air duct 13 is arranged around the rear and top of the refrigeration cavity 11, and one end of the air duct 13 is connected to the cavity 12, and the other end is connected to the refrigeration cavity 11 through the air outlet 15. The fan 2 is arranged in the cavity 12, and the evaporator 3 is arranged in the air duct 13. The fan 2 rotates to generate air flow, and the air flow enters the air duct 13, and is cooled to cold air by the evaporator 3. The cold air in the air duct 13 flows downward through the air outlet 15 to form an air curtain, and the air flow in the refrigerated cavity 11 re-enters the cavity 12 through the return air outlet 14 to form a cycle. It should be noted that a conventional refrigeration system is arranged in the air curtain cabinet, including the evaporator 3, the condenser, the throttling element and the compressor, etc. The arrangement of the condenser, the throttling element and the compressor is the same as that of the existing air curtain cabinet, and will not be repeated here.

[0047] Furthermore, a honeycomb air outlet grille 4 is provided at the air outlet 15; the cold air in the air duct 13 flows downward through the honeycomb air outlet grille 4 to form an air curtain. A fixed sheet metal part 5 is installed at one end of the air outlet 15 close to the front side of the refrigeration chamber 11, and a telescopic sheet metal part 6 is installed at one end of the air outlet 15 away from the front side of the refrigeration chamber 11. The honeycomb air outlet grille 4 is connected to the air outlet 15 through the fixed sheet metal part 5 and the telescopic sheet metal part 6, and the top surface of the honeycomb air outlet grille 4 is flush with the top wall of the refrigeration chamber 11 at the air outlet 15. One end of the telescopic sheet metal part 6 can be reciprocated and retracted along the width direction of the honeycomb air outlet grille 4, so as to adjust the number of honeycomb grilles on the honeycomb air outlet grille 4 for air outlet, that is, adjust the air outlet width of the honeycomb air outlet grille 4, that is, adjust the air outlet width of the air outlet 15, so as to adjust the thickness of the air curtain. When the temperature in the refrigerated chamber 11 is relatively high, one end of the telescopic sheet metal part 6 retracts inward to increase the air outlet width, thicken the air curtain, and enhance the air curtain performance; when the temperature in the refrigerated chamber 11 is relatively low, one end of the telescopic sheet metal part 6 extends outward to reduce the air outlet width, thin the air curtain, and reduce the energy consumption of the air curtain cabinet.

[0048] In the above-mentioned schematic embodiment, by setting the telescopic sheet metal part 6 at the air outlet 15, the air outlet width of the honeycomb air outlet grille 4 can be adjusted, so as to realize the adjustability of the air curtain thickness of the air curtain cabinet, thereby optimizing the air curtain performance, reducing the influence of heat penetration of the external environment on the items in the cabinet, and realizing energy-saving operation of the air curtain cabinet.

[0049] like Figure 2 As shown, in some embodiments, the telescopic sheet metal member 6 includes a body 61, a connecting portion 62 and a supporting portion 63 respectively connected to both ends of the body 61 and folded in the opposite direction. The connecting portion 62 of the telescopic sheet metal member 6 is connected to the top wall of the refrigerating chamber 11, and the supporting portion 63 of the telescopic sheet metal member 6 supports the bottom surface of the honeycomb air outlet grille 4; one end of the fixed sheet metal member 5 also supports the bottom surface of the honeycomb air outlet grille 4; thereby, the honeycomb air outlet grille 4 is connected to the air outlet 15. The supporting portion 63 of the telescopic sheet metal part 6 includes a supporting section 631 and a telescopic section 632; the supporting section 631 is attached to the bottom surface of the honeycomb air outlet grille 4 to support the honeycomb air outlet grille 4; the telescopic section 632 is slidably connected to the supporting section 631, and can be retracted into the supporting section 631 or extended out of the supporting section 631, that is, the telescopic section 632 can be retracted inward or extended outward relative to the supporting section 631; specifically, the telescopic section 632 can extend out of the supporting section 631 and reciprocate along the width direction of the honeycomb air outlet grille 4 to adjust the air outlet width of the honeycomb air outlet grille 4, thereby adjusting the thickness of the air curtain.

[0050] In some embodiments, the air curtain cabinet further includes a control system and a driving member electrically connected to the control system. The driving member is also connected to the telescopic section 632 of the telescopic sheet metal part 6 to drive the telescopic section 632 of the telescopic sheet metal part 6 to extend or shorten under the control of the control system. It should be noted that the driving member used in this embodiment can be an electric push rod, a hydraulic cylinder, a cylinder or a motor, etc., as long as it can drive the telescopic section 632 of the telescopic sheet metal part 6 to extend outward or retract inward in a certain amount, and the present invention does not make any special limitation on this.

[0051] In some embodiments, a plurality of temperature sensors are provided in the refrigerating chamber 11 to detect the temperature of various locations in the refrigerating chamber 11 in real time. The control system is electrically connected to the plurality of temperature sensors to simultaneously read the detection results of the plurality of temperature sensors and automatically obtain the average temperature in the refrigerating chamber 11. It is understood that the plurality of temperature sensors are arranged as evenly as possible in the refrigerating chamber 11 to fully understand the temperature conditions of various locations in the refrigerating chamber 11 and obtain the average temperature in the refrigerating chamber 11 more accurately.

[0052] Embodiment 1:

[0053] like Figure 1-Figure 3 As shown, based on the above-mentioned air curtain cabinet, the present invention also provides an air curtain thickness control method, comprising the following steps:

[0054] S1. In the control system, preset the temperature threshold T of the refrigeration chamber 11 M and temperature tolerance dT M , the maximum extension length L of the telescopic section 632 of the telescopic sheet metal part 6 is preset max , preset the telescopic step length dL of the telescopic segment 632, and preset the control time interval t;

[0055] It is understandable that the temperature threshold T of the refrigeration chamber 11 M Set to the expected ideal temperature of the temperature in the refrigeration chamber 11, taking into account the temperature tolerance value dT M , it is understandable that T M -dT M is the expected minimum temperature, T M +dT M The expected maximum temperature; the temperature of the air curtain cabinet refrigeration chamber 11 is between the expected minimum temperature and the expected maximum temperature, that is, at T M ±dT M When the temperature is within the range, the food in the cabinet can be kept at an ideal storage temperature, and the energy consumption of the air curtain cabinet is relatively reasonable; at the same time, the control time interval t can be set according to the need for thickness control of the air curtain cabinet, and the present invention does not make any special limitation on this;

[0056] S2: Under the control of the control system, the driving member extends the telescopic section 632 of the telescopic sheet metal member 6 out of the supporting section 631 until its extended length L reaches the initial extended length L. A It should be noted that the initial extension length L A Less than the maximum extension length L max , but greater than zero;

[0057] S3, the control system simultaneously reads the detection results of multiple temperature sensors, and automatically obtains the average temperature T in the refrigeration chamber 11 according to the reading results R ;

[0058] If T R =T M ±dT M , indicating that the temperature in the refrigeration chamber 11 is within the expected ideal range, that is, the thickness of the air curtain is appropriate, and the current extension length of the telescopic section 632 of the telescopic sheet metal part 6 is kept unchanged;

[0059] If T R <T M -dT M , indicating that the temperature in the refrigerated chamber 11 at this time is lower than the expected minimum temperature, that is, the air curtain has a better insulation effect on the external environment than expected, and the thickness of the air curtain is too thick. Therefore, the driving member, under the control of the control system, extends the telescopic section 632 of the telescopic sheet metal part 6 outward by dL, and reduces the thickness of the air curtain to achieve a balance between the temperature in the refrigerated chamber 11 and the energy consumption of the air curtain cabinet; it should be noted that when the extension length L of the telescopic section 632 reaches L max Then it will no longer stretch out;

[0060] If T R >T M +dT M , indicating that the temperature in the refrigeration chamber 11 at this time is higher than the expected maximum temperature, that is, the air curtain does not achieve the expected isolation effect on the external environment, and the thickness of the air curtain is too thin, and the telescopic section 632 of the telescopic sheet metal part 6 needs to be retracted inward; but first, it is necessary to determine whether the extended length of the telescopic section 632 of the telescopic sheet metal part 6 is greater than zero;

[0061] If not, it means that the telescopic section 632 of the telescopic sheet metal part 6 has not extended to cover the air outlet width of the honeycomb air outlet grille 4, but the temperature in the refrigerated chamber 11 has not reached the expected value, so the control system issues an alarm of over-limit regulation, prompting manual access inspection, the inspection content includes but is not limited to whether there are any working faults in the various components of the air curtain cabinet, etc. If there are no other faults, the temperature threshold T of the refrigerated chamber 11 can be adjusted within a reasonable range. M Settings;

[0062] If yes, it means that the telescopic section 632 of the telescopic sheet metal part 6 still has a retracting space, so the driving member retracts the telescopic section 632 of the telescopic sheet metal part 6 inward under the control of the control system, and the retracting amount is dL; it should be noted that when the extension length L of the telescopic section 632 reaches zero, it will no longer retract;

[0063] S4, continue timing, and repeat step S3 after each control time interval t, so that the control system is set according to the average temperature T in the refrigerating chamber 11. R The extension length L of the telescopic section 632 of the telescopic sheet metal part 6 is adjusted according to the real-time situation, so as to control the temperature in the refrigeration chamber 11 within the expected ideal temperature range and keep it relatively stable, and the energy consumption of the air curtain cabinet can be maintained at a reasonable level.

[0064] The above-mentioned schematic embodiment can automatically adjust the extension length of the telescopic section 632 of the telescopic sheet metal part 6 according to the real-time temperature conditions in the refrigerated cavity 11, thereby realizing automatic adjustment of the air outlet width of the air curtain cabinet, that is, the thickness of the air curtain, and optimizing the performance of the air curtain. This keeps the temperature in the refrigerated cavity 11 stable, reduces the influence of heat penetration of the external environment on the items in the cabinet, and realizes energy-saving operation of the air curtain cabinet.

[0065] Embodiment 2:

[0066] like Figure 1-Figure 4 As shown, based on the above air curtain cabinet, the present invention also provides another air curtain thickness control method, which further includes:

[0067] In step S1, a unit temperature difference value ΔT is also preset in the control system;

[0068] In step S3, at T R <T M -dT M When the telescopic section 632 of the telescopic sheet metal part 6 is extended outward, the extension amount is N ex ×dL; where N ex is the number of steps of the telescopic section 632 extending outward, calculated according to formula (1);

[0069]

[0070] In formula (1), the difference between the expected minimum temperature and the temperature in the refrigerating chamber 11 is calculated, and the difference is divided by the unit temperature difference value. The obtained quotient is rounded and added to 1 to obtain the number of steps N of the telescopic section 632 of the telescopic sheet metal part 6 extending outward. ex ; Then N exMultiplied by the telescopic step length dL, the extension amount of the telescopic section 632 is obtained; thus, according to the difference between the real-time temperature in the refrigerated chamber 11 and the expected minimum temperature, the extension amount of the telescopic section 632 of the telescopic sheet metal part 6 can be adjusted in a targeted manner, so that the thickness of the air curtain can be reduced more quickly, and the temperature in the refrigerated chamber 11 can be quickly adjusted to the expected ideal range.

[0071] In step S3, at T R >T M +dT M When the telescopic section 632 of the telescopic sheet metal part 6 is retracted inward, the retraction amount is N in ×dL; where N in is the number of steps of the telescopic section 632 retracting inward, calculated according to formula (2);

[0072]

[0073] In formula (2), the difference between the temperature in the refrigeration chamber 11 and the expected maximum temperature is calculated, and the difference is divided by the unit temperature difference value. The obtained quotient is rounded and added to 1 to obtain the number of steps N of the inward retraction of the telescopic section 632 of the telescopic sheet metal part 6. in ; Then N in Multiplied by the telescopic step length dL, it is the inward retraction amount of the telescopic section 632; thus, according to the difference between the real-time temperature in the refrigerated chamber 11 and the expected maximum temperature, the retraction amount of the telescopic section 632 of the telescopic sheet metal part 6 can be adjusted in a targeted manner, so that the thickness of the air curtain can be thickened more quickly, and the temperature in the refrigerated chamber 11 can be quickly adjusted to the expected ideal range.

[0074] In some embodiments, the maximum extension length L of the telescopic section 632 of the telescopic sheet metal part 6 is max Set according to formula (3);

[0075] L max =c×W B (3);

[0076] In formula (3), W B is the inherent air outlet width of the air outlet 15, c is the control coefficient, c = 0.2 to 0.5. The control coefficient c can be selectively set to any one of 0.2, 0.3, 0.4, and 0.5 according to actual needs.

[0077] In summary, the air curtain cabinet and the air curtain thickness control method thereof of the present invention, through the setting of the telescopic sheet metal part 6 at the air outlet 15, enable the control system to automatically adjust the air outlet width of the honeycomb air outlet grille 4 according to the real-time temperature conditions in the refrigeration chamber 11, thereby realizing automatic adjustment of the air curtain thickness of the air curtain cabinet, optimizing the air curtain performance, reducing the influence of heat penetration of the external environment on the items in the cabinet, and realizing energy-saving operation of the air curtain cabinet.

[0078] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0079] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for controlling the thickness of an air curtain cabinet, characterized in that: The air curtain cabinet comprises a cabinet body, wherein a refrigeration cavity, a cavity and an air duct are arranged in the cabinet body; wherein, The front side of the refrigerating chamber is open, and a return air port is provided on the bottom wall near the front side, and an air outlet is provided on the top wall near the front side; a honeycomb air outlet grille is provided at the air outlet, and a fixed sheet metal part is installed at one end of the air outlet near the front side of the refrigerating chamber, and a telescopic sheet metal part is installed at the end away from the front side of the refrigerating chamber, and the honeycomb air outlet grille is connected to the air outlet through the fixed sheet metal part and the telescopic sheet metal part, and the top surface of the honeycomb air outlet grille is flush with the top wall of the refrigerating chamber at the air outlet; one end of the telescopic sheet metal part can be extended along the width direction of the honeycomb air outlet grille The telescopic sheet metal part reciprocates to adjust the air outlet width of the honeycomb air outlet grille; the telescopic sheet metal part comprises a body, a connecting part respectively connected to both ends of the body and folded in the opposite direction, and a supporting part; the connecting part is connected to the top wall of the refrigeration chamber, and the supporting part supports the bottom surface of the honeycomb air outlet grille; the supporting part comprises a supporting section and a telescopic section slidably connected to the supporting section, the supporting section is attached to the bottom surface of the honeycomb air outlet grille to support the honeycomb air outlet grille, and the telescopic section can extend out of the supporting section and reciprocate along the width direction of the honeycomb air outlet grille to adjust the air outlet width of the honeycomb air outlet grille; The cavity is located below the refrigeration cavity and is connected to the refrigeration cavity through the return air port; The air duct is arranged around the rear and top of the refrigeration cavity, one end of the air duct is connected to the cavity, and the other end is connected to the refrigeration cavity through the air outlet; The air curtain cabinet also includes a control system and a driving member electrically connected to the control system; the driving member is also connected to the telescopic section of the telescopic sheet metal part to drive the telescopic section of the telescopic sheet metal part to extend or shorten under the control of the control system; a plurality of temperature sensors are provided in the refrigeration chamber to detect the temperature of various places in the refrigeration chamber in real time, and the control system is electrically connected to the plurality of temperature sensors to simultaneously read the detection results of the plurality of temperature sensors and automatically obtain the average temperature in the refrigeration chamber; The air curtain thickness control method of the air curtain cabinet comprises the following steps: S1. In the control system, a refrigeration chamber temperature threshold T is preset. M and temperature tolerance dT M , preset the maximum extension length L of the telescopic section of the telescopic sheet metal max , preset the telescopic step length dL of the telescopic segment, and preset the control time interval t; S2, extending the telescopic section of the telescopic sheet metal part out of the supporting section until its extended length L reaches the initial extended length L A ; S3, the control system simultaneously reads the detection results of multiple temperature sensors and automatically obtains the average temperature T in the refrigeration chamber R ; If T R =T M ±dT M , the current extension length of the telescopic section is kept unchanged; If T R <T M -dT M , the telescopic section is extended outward by an amount dL; when the extension length L of the telescopic section reaches L max Then it will no longer stretch out; If T R >T M +dT M , determine whether the extension length of the telescopic section is greater than zero; if not, the control system issues an alarm of over-limit regulation; if so, the telescopic section is retracted inwardly by an amount dL; when the extension length L of the telescopic section reaches zero, it will no longer retract; S4, continue timing, and repeat step S3 after each control time interval t, so that the control system is set according to the average temperature T in the refrigeration chamber. R The extension length L of the telescopic section of the telescopic sheet metal part is adjusted according to the real-time situation.

2. A method for controlling the thickness of an air curtain cabinet, characterized in that: The air curtain cabinet comprises a cabinet body, wherein a refrigeration cavity, a cavity and an air duct are arranged in the cabinet body; wherein, The front side of the refrigerating chamber is open, and a return air port is provided on the bottom wall near the front side, and an air outlet is provided on the top wall near the front side; a honeycomb air outlet grille is provided at the air outlet, and a fixed sheet metal part is installed at one end of the air outlet near the front side of the refrigerating chamber, and a telescopic sheet metal part is installed at the end away from the front side of the refrigerating chamber, and the honeycomb air outlet grille is connected to the air outlet through the fixed sheet metal part and the telescopic sheet metal part, and the top surface of the honeycomb air outlet grille is flush with the top wall of the refrigerating chamber at the air outlet; one end of the telescopic sheet metal part can be extended along the width direction of the honeycomb air outlet grille The telescopic sheet metal part reciprocates to adjust the air outlet width of the honeycomb air outlet grille; the telescopic sheet metal part comprises a body, a connecting part respectively connected to both ends of the body and folded in the opposite direction, and a supporting part; the connecting part is connected to the top wall of the refrigeration chamber, and the supporting part supports the bottom surface of the honeycomb air outlet grille; the supporting part comprises a supporting section and a telescopic section slidably connected to the supporting section, the supporting section is attached to the bottom surface of the honeycomb air outlet grille to support the honeycomb air outlet grille, and the telescopic section can extend out of the supporting section and reciprocate along the width direction of the honeycomb air outlet grille to adjust the air outlet width of the honeycomb air outlet grille; The cavity is located below the refrigeration cavity and is connected to the refrigeration cavity through the return air port; The air duct is arranged around the rear and top of the refrigeration cavity, one end of the air duct is connected to the cavity, and the other end is connected to the refrigeration cavity through the air outlet; The air curtain cabinet also includes a control system and a driving member electrically connected to the control system; the driving member is also connected to the telescopic section of the telescopic sheet metal part to drive the telescopic section of the telescopic sheet metal part to extend or shorten under the control of the control system; a plurality of temperature sensors are provided in the refrigeration chamber to detect the temperature of various places in the refrigeration chamber in real time, and the control system is electrically connected to the plurality of temperature sensors to simultaneously read the detection results of the plurality of temperature sensors and automatically obtain the average temperature in the refrigeration chamber; The air curtain thickness control method of the air curtain cabinet comprises the following steps: S1. In the control system, a refrigeration chamber temperature threshold T is preset. M and temperature tolerance dT M , preset the maximum extension length L of the telescopic section of the telescopic sheet metal max , preset the telescopic step length dL of the telescopic section, preset the control time interval t, and preset the unit temperature difference value ΔT; S2, extending the telescopic section of the telescopic sheet metal part out of the supporting section until its extended length L reaches the initial extended length L A ; S3, the control system simultaneously reads the detection results of multiple temperature sensors and automatically obtains the average temperature T in the refrigeration chamber R ; If T R =T M ±dT M , the current extension length of the telescopic section is kept unchanged; If T R <T M -dT M , then the telescopic section is extended outward by an amount of N ex ×dL; when the extension length L of the telescopic section reaches L max After that, it will not extend any further; among them, N ex is the number of steps of the telescopic section extending outward, calculated according to formula (1); If T R >T M +dT M , determine whether the extension length of the telescopic section is greater than zero; if not, the control system issues an alarm of over-limit regulation; if so, the telescopic section is retracted inwardly, and the retraction amount is N in ×dL; when the extension length L of the telescopic section reaches zero, it will no longer retract; where N in is the number of steps of the telescopic section retracting inwards, calculated according to formula (2); S4, continue timing, and repeat step S3 after each control time interval t, so that the control system is set according to the average temperature T in the refrigeration chamber. R The extension length L of the telescopic section of the telescopic sheet metal part is adjusted according to the real-time situation.

3. The air curtain thickness control method according to claim 1 or 2, characterized in that: The maximum extension length L of the telescopic section of the telescopic sheet metal part max Set according to formula (3); L max =c×W B (3); In formula (3), W B is the inherent air outlet width of the air outlet, c is the control coefficient, and c=0.2~0.5.

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