A steady defrosting and dust-removing refrigeration display cabinet and a defrosting and dust-removing method

Abstract

The application discloses a kind of steady-state defrosting and dust removing refrigerated display cabinet and defrosting and dust removing method, including cabinet, refrigeration system, refrigeration system includes compressor, heat exchanger, double-channel air door, heat exchanger includes inside the tank heat exchanger, tank outside heat exchanger, inside the tank heat exchanger is provided with two, two inside the tank heat exchanger inlet is respectively connected with the two interfaces of compressor exhaust end, outlet is all connected with compressor gas inlet end by inside the tank liquid accumulator, tank outside heat exchanger inlet is connected with the other interface of compressor exhaust end, tank outside heat exchanger outlet end is provided with two interfaces, two interfaces are respectively connected dry filter and tank outside liquid accumulator, tank outside liquid accumulator is connected with compressor gas inlet end by pipeline, dry filter outlet is provided with three interfaces, three interfaces are respectively connected with tank outside heat exchanger inlet and two inside the tank heat exchanger inlet.The application effectively guarantees that temperature in cabinet is relatively constant, effectively improves heat exchange efficiency;And pipeline connection is simple, convenient in later maintenance.

Description

Technical Field

[0001] This invention relates to the field of defrosting and dust removal technology for refrigeration equipment, and in particular to a refrigerated display case and defrosting and dust removal method based on steady-state defrosting and dust removal. Background Technology

[0002] Refrigerated display cases are used to display frozen foods, primarily in supermarkets and other retail locations. Horizontal refrigerated display cases are mainly designed for storing and displaying foods that are perishable or easily melted at high or room temperatures. However, after a period of operation, frost will form on the heat exchanger surface, affecting cooling efficiency. Currently, there are two common defrosting methods for refrigerated display cases: electric defrosting and thermal defrosting. Both methods require a complete shutdown of cooling during defrosting. The glass door of the refrigerated display case leaks a lot of heat, and even a slightly longer shutdown time will cause a significant rise in the internal temperature. Furthermore, the heat generated during defrosting accelerates the temperature rise, causing some temperature-sensitive goods inside the refrigerated display case to melt, affecting its usability. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the prior art, the present invention proposes a refrigerated display cabinet with steady-state defrosting and dust removal and a defrosting and dust removal method.

[0004] The technical solution adopted by this invention to solve its technical problem is: a refrigerated display cabinet with steady-state defrosting and dust removal, comprising a cabinet body and a refrigeration system. The refrigeration system is installed inside the cabinet body and includes a compressor, a heat exchanger, and a dual-channel damper. The heat exchanger includes an internal heat exchanger and an external heat exchanger. There are two internal heat exchangers, and the inlets of the two internal heat exchangers are respectively connected to two interfaces at the exhaust end of the compressor. The outlets of the two internal heat exchangers are each connected to the air inlet of the compressor through an internal liquid receiver. The inlet of the external heat exchanger is connected to another interface at the exhaust end of the compressor. The outlet of the external heat exchanger has two interfaces, which are respectively connected to a dryer filter and an external liquid receiver. The external liquid receiver is connected to the air inlet of the compressor through a pipeline. The outlet of the dryer filter has three interfaces, which are respectively connected to the inlet of the external heat exchanger and the inlets of the two internal heat exchangers.

[0005] The dual-channel damper includes a mounting body, damper 1, and damper 2. The mounting body is installed between two heat exchangers inside the box, and damper 1 and damper 2 are respectively installed on both sides of the mounting body and can rotate along both sides of the mounting body.

[0006] In the aforementioned type of refrigerated display cabinet with steady-state defrosting and dust removal, the outlet of the dryer filter is connected to a one-in-three-out steady-state solenoid valve. Directions 8 and 10 of the one-in-three-out steady-state solenoid valve are respectively connected to two heat exchangers inside the cabinet, and direction 9 is connected to an external heat exchanger.

[0007] In the aforementioned refrigerated display cabinet with steady-state defrosting and dust removal, an external heat exchange fan is installed at the corresponding position of the external heat exchanger, and an internal heat exchange fan is installed at the corresponding position of each of the two internal heat exchangers.

[0008] The aforementioned refrigerated display cabinet with steady-state defrosting and dust removal is equipped with internal heat exchanger sensors on both of the internal heat exchangers, a cabinet temperature sensor inside the cabinet, and a controller inside the cabinet. The internal heat exchanger sensors, the cabinet temperature sensor, the internal heat exchanger fan, the external heat exchanger fan, and the dual-channel damper are all electrically connected to the controller.

[0009] The defrosting method for a refrigerated display case with steady-state defrosting and dust removal, as described above, specifically includes:

[0010] Damper 1 and damper 2 rotate to one side of one of the heat exchangers in the box to perform heat insulation defrosting on the heat exchanger in the box.

[0011] The compressor discharges high-temperature, high-pressure refrigerant gas to both the external heat exchanger and the internal heat exchanger awaiting defrosting. The refrigerant passing through the external heat exchanger condenses into a liquid under the action of the external heat exchanger fan, and is discharged through the external heat exchanger outlet, entering the dryer filter. At this time, the external heat exchanger fan speed decreases, and the condensing pressure in this path increases. The internal heat exchanger fan stops, and the refrigerant passing through the internal heat exchanger awaiting defrosting defrosts that heat exchanger, and is then discharged through the outlet of the internal heat exchanger awaiting defrosting. After entering the dryer filter, the two refrigerants merge in the dryer filter and then enter another internal heat exchanger. At this time, the internal heat exchanger fan corresponding to the internal heat exchanger operates normally, supplementing the internal cooling capacity. The internal heat exchanger sensor on the internal heat exchanger to be defrosted detects the temperature of the internal heat exchanger to be defrosted to determine whether defrosting is complete. If defrosting is complete, the controller sends a signal to the dual-channel damper, and the dual-channel damper rotates to both sides of the other internal heat exchanger to perform adiabatic defrosting on the other internal heat exchanger.

[0012] The above-mentioned method for dust removal in a refrigerated display case with steady-state defrosting and dust removal involves rotating damper 1 and damper 2 to one side of one of the heat exchangers inside the case to insulate the heat exchanger inside the case.

[0013] The compressor discharges high-temperature, high-pressure refrigerant gas into the insulated heat exchanger inside the chamber. The heat exchanger fan inside the chamber stops. The high-temperature refrigerant releases heat and liquefies in the insulated heat exchanger, then exits through the outlet and enters the dryer filter. The refrigerant discharged from the dryer filter then flows through pipes to the external heat exchanger and the uninsulated internal heat exchanger. At this point, the external heat exchanger fan stops, the surface temperature of the external heat exchanger decreases, and frost forms. The refrigerant discharged from the external heat exchanger returns to the compressor through pipes. The internal heat exchanger fan corresponding to the uninsulated internal heat exchanger operates normally, providing cooling to the chamber. The refrigerant discharged from the heat exchanger returns to the compressor through the pipeline. When the heat load of the insulated heat exchanger inside the chamber reaches the critical state, the controller controls the dual-channel damper to rotate to the other side of the heat exchanger inside the chamber, so that the functions of the two heat exchangers inside the chamber are swapped. The above steps are repeated. When the heat load of the heat exchanger inside the chamber reaches the critical state at this time, the controller controls the dual-channel damper to open, and the refrigeration system cools normally. At this time, the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the heat exchanger outside the chamber. The heat exchanger fan outside the chamber operates normally, the temperature of the heat exchanger outside the chamber rises, the frost on the surface melts and forms water flow to carry away the surface dust and complete the dust removal process.

[0014] The beneficial effects of this invention are that by setting up a dual-channel damper and two internal heat exchangers, the technical problem of excessively rapid temperature rise inside the freezer display case during defrosting is solved, ensuring a relatively constant temperature inside the case. At the same time, through the cooperation of the dual-channel damper, internal heat exchanger, and external heat exchanger, dust on the surface of the external heat exchanger can be effectively removed, improving heat exchange efficiency. Furthermore, the piping connection of this invention is simple, and subsequent maintenance is convenient. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is the refrigerant flow path diagram for normal refrigeration in this invention;

[0017] Figure 2 This invention provides a defrosting refrigerant flow path. Figure 1 ;

[0018] Figure 3 This invention provides a defrosting refrigerant flow path. Figure 2 ;

[0019] Figure 4 The dust removal refrigerant flow path of the present invention Figure 1 ;

[0020] Figure 5 The dust removal refrigerant flow path of the present invention Figure 2 ;

[0021] Figure 6 This is the dual-channel damper state 1 of the present invention;

[0022] Figure 7 This is the dual-channel damper state 2 of the present invention;

[0023] Figure 8 This is state 3 of the dual-channel damper of the present invention.

[0024] In the diagram, D. Mounting body, AD1. Damper 1, AD2. Damper 2, S1. Sensor for the first internal heat exchanger, S2. Sensor for the second internal heat exchanger, S3. Cabinet temperature sensor, E1. Heat exchanger in the first internal chamber, E2. Heat exchanger in the second internal chamber, COM. Compressor, C. External heat exchanger, CA1. First capillary tube, CA2. Second capillary tube, CA3. Third capillary tube, L1. First liquid receiver, L2. Second liquid receiver, L3. Third liquid receiver, Fan1. Heat exchange fan in the first internal chamber, Fan2. Heat exchange fan in the second internal chamber, Fan3. Heat exchange fan outside the chamber. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This embodiment discloses a freezer display cabinet with steady-state defrosting, including a cabinet body and a refrigeration system. The refrigeration system is installed inside the cabinet body and includes a compressor, heat exchangers, and a dual-channel damper. The heat exchanger includes an internal heat exchanger and an external heat exchanger. Two internal heat exchangers are provided, with their inlets connected to two interfaces on the compressor's exhaust end, respectively. The outlets of both internal heat exchangers are connected to the compressor's air inlet end via an internal liquid receiver. The inlet of the external heat exchanger is connected to the other interface on the compressor's exhaust end, and the outlet of the external heat exchanger has two interfaces. The interfaces are connected to the dryer filter and the external liquid receiver respectively. The external liquid receiver is connected to the compressor inlet through a pipeline. The dryer filter outlet is provided with three interfaces, which are connected to the inlet of the external heat exchanger and the inlet of the two internal heat exchangers respectively. The dual-channel damper includes a mounting body D, damper 1 AD1, and damper 2 AD2. The mounting body is installed between the two internal heat exchangers. Dampers 1 and 2 are installed on both sides of the mounting body respectively. Driven by a motor, dampers 1 and 2 can rotate along both sides of the mounting body (the dual-channel damper structure is existing technology and will not be described in detail here).

[0027] Both heat exchangers inside the chamber are equipped with heat exchanger sensors. A cabinet temperature sensor S3 is installed inside the cabinet. A controller is also installed inside the cabinet. The heat exchanger sensors inside the chamber, the cabinet temperature sensor, the heat exchanger fan inside the chamber, the heat exchanger fan outside the chamber, and the dual-channel damper are all electrically connected to the controller.

[0028] Specifically, the compressor's COM return end is connected to the four-way pipe ST1, and the discharge end is connected to the four-way pipe ST2. Four-way pipe ST2 connects to normally closed solenoid valve V5 in direction 1 and to normally closed solenoid valve V6 in direction 2. Direction 3 connects to the normally open solenoid valve V7. Solenoid valve V5 connects to the tee pipe i at the inlet of heat exchanger E1 in the first chamber. Direction j of the tee pipe connects to capillary tube CA3. Heat exchanger E1 in the first chamber is connected to a one-inlet, two-outlet steady-state solenoid valve V1. Solenoid valve V1 connects to the first liquid receiver L1 via direction 11. Solenoid valve V1 connects to the four-way pipe ST3 at the inlet of filter drier F via direction g. The second liquid receiver L2 is connected to the compressor return gas end four-way pipe ST1 via a pipeline via direction c. Solenoid valve V6 connects to the tee pipe k at the inlet of heat exchanger E2 in the second chamber. Direction m connects to capillary tube CA1. Heat exchanger E2 in the second chamber is connected to a one-inlet, two-outlet steady-state solenoid valve V2. Solenoid valve V2 connects to the second liquid receiver L2 via direction 4. Direction 7 connects to the four-way pipe ST3 at the inlet of filter drier F via direction h. The second liquid receiver L2 is connected to the compressor return gas end four-way pipe via a pipeline via direction b. Solenoid valve V7 is connected to the tee pipe at the inlet of external heat exchanger C in direction d, and direction e is connected to the second capillary tube CA2. External heat exchanger C is connected to a one-in-two-out steady-state solenoid valve V3. Solenoid valve V3 is connected to the third liquid receiver L3 in direction 5, and to the four-way pipe ST3 at the inlet of dryer filter F in direction f. The third liquid receiver L3 is connected to the four-way pipe at the return end of the compressor in direction a through a pipeline. Dryer filter F outlet is connected to a one-in-three-out steady-state solenoid valve V4. V4 is connected to the third capillary tube CA3 in direction 8, and the other end is connected to the tee pipe at the inlet of the first internal heat exchanger E1 in direction j). Direction 9 is connected to the second capillary tube CA2 (the other end is connected to the tee pipe at the inlet of external heat exchanger C in direction e). Direction 10 is connected to the first capillary tube CA1, and the other end is connected to the tee pipe at the inlet of the second internal heat exchanger E2 in direction l.

[0029] Under normal refrigeration conditions, the refrigerant flow path of this refrigerated display case is as follows: Figure 1As shown, high-temperature and high-pressure refrigerant gas is discharged from the compressor COM discharge end through the four-way pipe ST2 in direction 3. It passes through the long-way solenoid valve V7, and enters the external heat exchanger C through the three-way pipe TL3 in direction d. With the help of the external heat exchange fan Fan3, the external heat exchanger C condenses the refrigerant into liquid. Then, it is discharged from the external heat exchanger C through the outlet. It passes through the one-in-two-out solenoid valve V3 in direction 6, and enters the dryer filter F through the four-way pipe ST3 in direction f. After the refrigerant liquid is processed, it enters the first capillary tube CA1 and the third capillary tube CA3 through the one-in-three-out steady-state solenoid valve V4 in directions 8 and 10, respectively. Refrigerant passing through the third capillary tube CA3 enters the first heat exchanger E1 via the three-way pipe TL2 in direction j. After heat exchange, the refrigerant leaves the first heat exchanger E1 and enters the receiver L1 via the one-in-two-out steady-state solenoid valve V1 in direction 1, then returns to the compressor via the return gas end four-way pipe ST1 in direction c. Refrigerant passing through CA1 enters the second heat exchanger E2 via the three-way pipe TL1 in direction l. After heat exchange, the refrigerant leaves the second heat exchanger E2 and enters the receiver L2 via the one-in-two-out steady-state solenoid valve V2 in direction 4, then returns to the compressor via the return gas end four-way pipe ST1 in direction b. At this time, both the first and second heat exchange fans Fan1 and Fan2 are operating normally, and the dampers 1AD1 and 2AD2 are in a state similar to the airflow inside the chamber. Figure 8 The controller controls the compressor's start and stop based on the temperature sensed by the cabinet temperature sensor S3.

[0030] In the defrosting state of this refrigerated display case, the refrigerant flow path is as follows: Figure 2 and Figure 3 As shown. The first stage is the defrosting stage of the heat exchanger E1 inside the box, as follows. Figure 2As shown. The compressor COM discharges high-temperature, high-pressure refrigerant gas via the four-way pipe ST2 in directions 3 and 1. The refrigerant via direction 3 passes through the long-way solenoid valve V7, then through the three-way pipe TL3 in direction d, into the external heat exchanger C. With the help of the external heat exchange fan Fan3, the refrigerant in the external heat exchanger C condenses into liquid, then exits through the outlet of the external heat exchanger C. It then passes through the one-in-two-out solenoid valve V3 in direction 6, and through the four-way pipe ST3 in direction f, into the dryer filter F. At this time, the speed of the external heat exchange fan Fan3 slows down, the condensation pressure in this path increases, and more refrigerant flows along another path; the refrigerant via direction 1... When solenoid valve V5 is closed, the refrigerant enters the first heat exchanger E1 through the three-way pipe TL2 in direction i. In the first heat exchanger E1, the heat exchange fan Fan1 stops. The high-temperature refrigerant heats the first heat exchanger E1 to defrost, and then exits through the outlet. It then passes through the one-in-two-out solenoid valve V1 in direction 12, and through the four-way pipe ST3 in direction g, into the dryer filter F. The two refrigerant paths converge in F and then pass through the one-in-three-out steady-state solenoid valve V4 in direction 10, entering the capillary tube CA1. The refrigerant passing through CA1 enters the second heat exchanger E2 through the three-way pipe TL1 in direction l. After heat exchange and cooling, the refrigerant leaves the second heat exchanger E2 and enters the second liquid receiver L2 through the one-in-two-out steady-state solenoid valve V2 in direction 4. It then returns to the compressor through the return gas end four-way pipe ST1 in direction b. At this time, the heat exchange fan Fan2 operates normally, replenishing the cooling capacity into the chamber. The dampers 1AD1 and 2AD2 are in contact with the airflow inside the chamber. Figure 7 As shown, the heat exchanger E1 in the first chamber is in adiabatic defrosting mode. The controller determines whether defrosting is complete based on the temperature sensed by the sensor S1 in the first chamber, and then controls the compressor to start and stop. When S1 senses that the temperature of the heat exchanger in the first chamber reaches 10-15℃, it enters the second stage.

[0031] After defrosting of the first internal heat exchanger E1, the second stage begins with defrosting of the second internal heat exchanger E2. High-temperature, high-pressure refrigerant gas is discharged from the compressor COM discharge end via four-way pipe ST2 in directions 3 and 2. The refrigerant via direction 3 passes through the long-circuit solenoid valve V7, then through the three-way pipe TL3 in direction d, and enters the external heat exchanger C. In external heat exchanger C, with the help of external heat exchange fan Fan3, the refrigerant is condensed into liquid, and then discharged through the outlet of external heat exchanger C. It then passes through the one-in-two-out solenoid valve V3 in direction 6, and through the four-way pipe ST3 in direction f, enters the dryer filter F. At this time, the speed of external heat exchange fan Fan3 slows down, the condensing pressure in this path increases, and more refrigerant flows along another path; the refrigerant via direction 2 is continuously closed. Solenoid valve V6 enters the second heat exchanger E2 through the three-way pipe TL1 in the direction k. In the second heat exchanger E2, the heat exchange fan Fan2 stops. The high-temperature refrigerant heats the second heat exchanger E2 to defrost, and then exits through the outlet of the second heat exchanger E2. It then enters the dryer filter F through the four-way pipe ST3 in the direction h through the one-in-two-out solenoid valve V2 in the direction 7. The two refrigerant paths merge in the dryer filter F and then enter the third capillary tube CA3 through the one-in-three-out steady-state solenoid valve V4 in the direction 8. The refrigerant, passing through the third capillary tube CA3, enters the first heat exchanger E1 via the three-way pipe TL2 in direction j. After heat exchange and cooling, the refrigerant leaves the first heat exchanger E1 and enters the first liquid receiver L1 via the one-inlet, two-outlet steady-state solenoid valve V1 in direction 11. It then returns to the compressor via the four-way pipe ST1 in direction c. At this time, the heat exchange fan Fan1 in the first chamber operates normally, supplementing the chamber with cooling capacity. The dampers 1AD1 and 2AD2 are in contact with the airflow inside the chamber. Figure 6 As shown, the heat exchanger E2 in the second chamber is in adiabatic defrosting mode. The controller determines whether defrosting is complete based on the temperature sensed by the sensor S2 in the second chamber, and then controls the compressor to start and stop. When S2 senses that the temperature of the heat exchanger in the second chamber reaches 10-15℃, defrosting is complete.

[0032] The refrigerant flow path of this refrigerated display case is as follows (during dust removal). Figure 4 and Figure 5 As shown. The first stage involves heat exchanger E1 inside the first chamber receiving the heat load, while heat exchanger E2 inside the second chamber replenishes the cooling capacity. The dust removal stage of the external heat exchanger C during defrosting is as follows... Figure 4As shown. High-temperature, high-pressure refrigerant gas is discharged from the compressor COM discharge end via the four-way pipe ST2 in direction 1. The refrigerant in direction 1 passes through the permanently closed solenoid valve V5, then through the three-way pipe TL2 in direction i, and enters the first internal heat exchanger E1. In the first internal heat exchanger E1, the internal heat exchange fan Fan1 stops, and the high-temperature refrigerant releases heat and liquefies in the first internal heat exchanger E1. It then exits the first internal heat exchanger E1 through the outlet, passes through the one-in-two-out solenoid valve V1 in direction 12, and through the four-way pipe ST3 in direction g, enters the dryer filter F. After exiting the dryer filter F, it passes through the one-in-three-out steady-state solenoid valve V4 in directions 9 and 10, respectively, and enters the first capillary tube CA1 and the second capillary tube CA2. The refrigerant passing through the second capillary tube CA2 enters the external heat exchanger C through the three-way pipe TL3 in direction e. The surface temperature of heat exchanger C decreases and frost forms (at this time, the external heat exchange fan Fan3 stops operating). The refrigerant leaving the external heat exchanger C enters the third liquid receiver L3 through direction 5 of the one-in-two-out steady-state solenoid valve V3, and returns to the compressor through direction a of the return gas end four-way pipe ST1. The refrigerant passing through the first capillary tube CA1 enters the second internal heat exchanger E2 through direction l of the three-way pipe TL1. After heat exchange and cooling, the refrigerant leaves the second internal heat exchanger E2 through direction 4 of the one-in-two-out steady-state solenoid valve V2, enters the second liquid receiver L2, and returns to the compressor through direction b of the return gas end four-way pipe ST1. At this time, the second internal heat exchange fan Fan2 operates normally, replenishing the cooling capacity into the chamber. The dampers 1AD1 and 2AD2 are in contact with the airflow inside the chamber. Figure 7 As shown, the heat exchanger E1 in the first chamber is in an adiabatic state, receiving the heat load. The controller determines the heat load status based on the temperature sensing of the heat exchanger S1 in the first chamber and then controls the compressor to start and stop. When S1 senses that the temperature of the heat exchanger in the first chamber reaches 10-15℃, it enters the second stage.

[0033] After this process, the second stage begins, where the second heat exchanger E2 inside the chamber receives the heat load, the first heat exchanger E1 inside the chamber replenishes the cooling capacity, and the external heat exchanger C undergoes frosting and dust removal. High-temperature, high-pressure refrigerant gas is discharged from the compressor COM exhaust end via the four-way pipe ST2 in direction 2. The refrigerant passing through direction 2 passes through the permanently closed solenoid valve V6, through the three-way pipe TL1 in direction k, and enters the second heat exchanger E2 inside the chamber. The heat exchange fan Fan2 inside the chamber stops, and the high-temperature refrigerant releases heat and liquefies in the second heat exchanger E2. It then exits through the outlet of the second heat exchanger E2, passes through the one-in-two-out solenoid valve V2 in direction 7, through the four-way pipe ST3 in direction h, and enters the dryer filter F. After exiting the dryer filter F, it passes through the one-in-three-out steady-state solenoid valve V4 in directions 8 and 9, respectively, entering the second capillary tube CA2 and the third capillary tube CA3. The refrigerant passing through the second capillary tube CA2 enters the external heat exchanger C through the three-way pipe TL3 in direction e. The surface temperature of the external heat exchanger C... To reduce frost (at this time, the external heat exchange fan Fan3 stops running), the refrigerant exiting the external heat exchanger C enters the third liquid receiver L3 through direction 5 of the one-in-two-out steady-state solenoid valve V3, and returns to the compressor through direction a of the return gas end four-way pipe ST1; the refrigerant through the third capillary tube CA3 enters the first internal heat exchanger E1 through direction j of the three-way pipe TL2. After heat exchange and cooling, the refrigerant exits the first internal heat exchanger E1 through direction 11 of the one-in-two-out steady-state solenoid valve V1 and enters the first liquid receiver L1, returning to the compressor through direction c of the return gas end four-way pipe ST1. At this time, the first internal heat exchange fan Fan1 operates normally, supplementing the cooling capacity into the chamber. The dampers 1AD1 and 2AD2 are in contact with the airflow inside the chamber. Figure 6 As shown, the heat exchanger E2 in the second chamber is in an adiabatic state, receiving the heat load. The controller determines the heat load status based on the temperature sensed by sensor S2 on the heat exchanger in the second chamber and then controls the compressor to start and stop. This stage ends when S2 senses that the temperature of the heat exchanger in the second chamber reaches 10-15℃. After the above two stages, the surface of the heat exchanger C in the chamber has been frosted. The refrigeration system then enters normal refrigeration mode, and the refrigerant flow path is as follows. Figure 1 As shown, the compressor COM discharges high-temperature and high-pressure refrigerant gas into the external heat exchanger C. The external heat exchange fan Fan3 operates normally, and the temperature of the external heat exchanger C rises rapidly. The frost on the surface melts, forming a large water flow that carries away the surface dust.

[0034] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A refrigerated display case with steady-state defrosting and dust removal, comprising a cabinet body and a refrigeration system, wherein the refrigeration system is installed inside the cabinet body, characterized in that, The refrigeration system includes a compressor, a heat exchanger, and a dual-channel damper. The heat exchanger includes an internal heat exchanger and an external heat exchanger. There are two internal heat exchangers. The inlets of the two internal heat exchangers are respectively connected to two interfaces on the exhaust end of the compressor. The outlets of the two internal heat exchangers are each connected to the air inlet of the compressor through an internal liquid receiver. The inlet of the external heat exchanger is connected to another interface on the exhaust end of the compressor. The outlet of the external heat exchanger has two interfaces, which are respectively connected to a dryer filter and an external liquid receiver. The external liquid receiver is connected to the air inlet of the compressor through a pipeline. The outlet of the dryer filter has three interfaces, which are respectively connected to the inlet of the external heat exchanger and the inlets of the two internal heat exchangers. The dual-channel damper includes a mounting body, damper 1, and damper 2. The mounting body is installed between two heat exchangers inside the box, and damper 1 and damper 2 are respectively installed on both sides of the mounting body and can rotate along both sides of the mounting body. Damper 1 and damper 2 rotate to one side of one of the heat exchangers inside the chamber, initiating defrosting of that heat exchanger. High-temperature, high-pressure refrigerant gas is discharged from the compressor exhaust end to both the external heat exchanger and the heat exchanger inside the chamber awaiting defrosting. The refrigerant passing through the external heat exchanger condenses into liquid under the action of the external heat exchanger fan, exiting through the external heat exchanger outlet and entering the dryer filter. At this time, the speed of the external heat exchanger fan slows down, and the condensation pressure in this path increases. The internal heat exchanger fan stops rotating, and the refrigerant passing through the heat exchanger awaiting defrosting begins to defrost. The refrigerant is frost-free and then discharged through the outlet of the heat exchanger in the chamber to be defrosted into the dryer filter. The two refrigerant lines merge in the dryer filter and then enter another heat exchanger in the chamber. At this time, the heat exchange fan corresponding to the heat exchanger in the chamber operates normally to supplement the chamber with cooling capacity. The heat exchanger sensor on the heat exchanger to be defrosted detects the temperature of the heat exchanger to be defrosted to determine whether defrosting is complete. If defrosting is complete, the controller sends a signal to the dual-channel damper. The dual-channel damper rotates to both sides of the other heat exchanger in the chamber to perform adiabatic defrosting on the other side of the heat exchanger. Damper 1 and damper 2 rotate to one side of one of the heat exchangers inside the chamber, insulating that heat exchanger. The compressor discharges high-temperature, high-pressure refrigerant gas into the insulated heat exchanger. The heat exchange fan inside the chamber stops. The high-temperature refrigerant releases heat and liquefies in the insulated heat exchanger, then exits through the outlet into the dryer filter. The refrigerant discharged from the dryer filter then flows through pipelines into the external heat exchanger and the uninsulated internal heat exchanger. At this time, the external heat exchange fan stops, the surface temperature of the external heat exchanger decreases, and frost forms. The refrigerant discharged from the external heat exchanger returns to the compressor through pipelines. The heat exchange fan corresponding to the uninsulated internal heat exchanger rotates normally. Cooling capacity is supplied to the cabinet, and the refrigerant discharged from the uninsulated heat exchanger returns to the compressor through the pipeline; when the heat load of the insulated heat exchanger reaches the critical state, the controller controls the dual-channel damper to rotate to the other side of the heat exchanger, so that the functions of the two heat exchangers are swapped, and the above steps are repeated. When the heat load of the heat exchanger reaches the critical state, the controller controls the dual-channel damper to open, and the refrigeration system cools normally. At this time, the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the external heat exchanger, the external heat exchange fan operates normally, the temperature of the external heat exchanger rises, the frost on the surface melts and forms water flow to carry away the surface dust and complete the dust removal process. The outlet of the dryer filter is connected to a one-in-three-out steady-state solenoid valve. Direction 8 and direction 10 of the one-in-three-out steady-state solenoid valve are respectively connected to two heat exchangers inside the chamber, and direction 9 is connected to the heat exchanger outside the chamber.

2. The refrigerated display case with steady-state defrosting and dust removal according to claim 1, characterized in that, An external heat exchange fan is installed at the corresponding position of the external heat exchanger, and an internal heat exchange fan is installed at the corresponding position of each of the two internal heat exchangers.

3. The refrigerated display case with steady-state defrosting and dust removal according to claim 1, characterized in that, Both heat exchangers inside the chamber are equipped with heat exchanger sensors. A cabinet temperature sensor is installed inside the cabinet. A controller is also installed inside the cabinet. The heat exchanger sensors, cabinet temperature sensor, heat exchanger fan inside the chamber, heat exchanger fan outside the chamber, and dual-channel damper are all electrically connected to the controller.

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