Patent Application
20190008289
This application claims priority to Chinese Patent Application No. 201720817201.X, filed Jul. 7, 2017, and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference.
The utility model relates to the field of refrigeration, and in particular, to a refrigeration display cabinet.
Consumables on the market that need to be stored at a low temperature are generally placed in a refrigeration display cabinet in the market for storage and sales exhibition. According to storage requirements of such consumables, the design of the refrigeration display cabinet emphasizes the refrigeration capability and constant-temperature performance. As for the design of the constant-temperature performance, an evaporator of a current conventional refrigeration display cabinet will have frost due to a temperature difference between internal and external environments after a system of the refrigeration display cabinet operates for a period of time. If a defrosting operation is performed directly, a flow path of the evaporator is directly disconnected, and the temperature of air emitted in the refrigeration display cabinet will increase gradually, which causes the temperature of the consumables stored in the cabinet to increase by about 1-3° C., greatly affecting the storage of the commodities. Further, in normal operating after the defrosting operation is performed, the temperature of the consumables will be reduced by the same value, and such temperature fluctuation has a greater effect on the consumables. The defrosting operation of the refrigeration display cabinet is performed frequently. Therefore, the storage life of the consumables, e.g., foods is greatly reduced. Moreover, a compressor needs to be controlled on and off frequently, affecting reliability of the compressor.
The utility model is directed to a refrigeration display cabinet, so as to solve the problem of severe temperature fluctuation of a display cabinet during defrosting of evaporators.
According to one aspect of the utility model, a refrigeration display cabinet is provided, including: a refrigeration loop having an exhaust port of a compressor, a condenser, throttling elements, a plurality of evaporators connected in parallel, and an induction port of the compressor that are connected sequentially through a flow path; a display space; and a display cabinet base in which the plurality of evaporators are superposed, wherein partition boards are disposed between the plurality of evaporators respectively, and gutters are disposed at two sides of each of the partition boards.
Referring to
On the other hand, the refrigeration display cabinet body includes a display space 120 configured to provide food storage and sales exhibition, and a display cabinet base 130 configured to provide an installation space for some components and parts of the refrigeration loop. Specifically, the two evaporators 111a, 111b are superposed in the display cabinet base 130. A partition board 112 is disposed between the two evaporators 111a, 111b. Gutters 112a, 112b are disposed at two sides of each partition board 112. The structure of this embodiment is described by taking two evaporators as an example. In fact, the number of deployed evaporators can be changed according to actual situations in consideration of performance tests and costs, and partition boards 112 provided with gutters 111a, 111b at two sides can be disposed between the evaporators respectively.
In such a deployment, the evaporator assembly is formed by a plurality of evaporators assembled together. Taking two groups of evaporators as an example, the two groups of evaporators can be turned off separately for defrosting. In this case, the refrigeration display cabinet can always be in the refrigeration operating state, and the temperature in the display space can be more stable even though the refrigeration capability is lowered, thus managing and controlling the food temperature more desirably. Besides, energy consumption is reduced as no electric heating tube needs to be disposed. Moreover, the number of start and stop times is reduced to lower the impact of pressure pulsation on the compressor. Moreover, when the required refrigeration load is less than half of a total rated value or lower, it is also possible to turn on only one group of evaporators and turn off the other group of evaporators. In this case, the evaporator will operate a smaller heat-exchange area, and the refrigeration daily electrical energy consumption (REC) is reduced accordingly.
More crucially, when the evaporator 111a disposed relatively at the upper side performs defrosting and the evaporator 111b disposed relatively at the lower side operates, water from melted frost generated during defrosting of the evaporator 111a will drop and be collected on the partition board 112 because the partition board 112 is disposed between the two evaporators. The water is then guided along the gutters 112a, 112b at two sides of the partition board 112, thus avoiding the problem that the water drops on the evaporator 111b underneath and is frosted again. The gutters disposed at two sides effectively avoid the problems such as tilted deployment of the partition board due to installation precision or structural design, such that the water from melted frost can be guided to be drained in any case. Moreover, the gutters disposed at two sides also accelerate the drainage of the water from melted frost, thus shortening an operation time of defrosting and optimally alleviating the problem of temperature fluctuation in the cabinet.
Moreover, to further improve the refrigeration display cabinet, structures or connections of the components and parts in the refrigeration display cabinet are further optimized or adjusted, which will be described through examples in the following.
Referring to
Referring to
Optionally, the display space 120 can be provided with an opening, and an air curtain 121 is formed at the opening, for a consumer to view and acquire a commodity conveniently. For another example, the display cabinet base 130 is disposed at the bottom of the display space 120. As such, the consumer can view and acquire the commodity in the display space 120 more conveniently, and the refrigeration loop can be deployed in the display cabinet base 130 more conveniently.
Moreover, the refrigeration loop 110 further includes two solenoid valves 114a, 114b disposed corresponding to the two evaporators 111a, 111b. The two solenoid valves 114a, 114b are configured to control on/off of the evaporators 111a, 111b respectively. In this case, an evaporator to be turned off for a defrosting operation can be selected according to an actual frosting situation, thus achieving higher flexibility. Moreover, an evaporator can be actively turned off when the refrigeration load of the refrigeration display cabinet is low, thereby improving the utilization rate of energy and reducing the cost.
Still referring to
Further, the solenoid valves 114a, 114b can be disposed on the refrigeration loop 110 at upstream of the throttling elements 115a, 115b. In this case, when the solenoid valves 114a, 114b are turned off to perform the defrosting operation, refrigerant is prevented from flowing continuously and being stocked in the evaporators 111a, 111b and the throttling elements 115a, 115b. Therefore, loss of some refrigerant participating in the work can be avoided on one hand, and energy consumption of defrosting can also be lowered on the other hand.
In addition, to facilitate monitoring of the defrosting operation, the refrigeration loop 110 further includes sensors disposed corresponding to the two evaporators 111a, 111b. The two solenoid valves 114a, 114b separately control on/off of the evaporators 111a, 111b based on feedback data of the sensors. For example, the sensors shown in
Optionally, the refrigeration loop 110 may also employ a multi-way valve to selectively turn on one of the evaporators connected in parallel, and the foregoing effect can also be achieved.
Here, an example of a normal operating mode of the refrigeration display cabinet is also provided. Based on the normal operating mode, time for stopping operation and performing defrosting is provided for each evaporator. Therefore, the demands of using a designated defrosting mode can be reduced as far as possible, such that the whole display cabinet operates more stably. Specifically, during normal running of the refrigeration display cabinet 100, the refrigeration loop 110 is configured to perform the following operations circularly: all the evaporators 111a, 111b work; the evaporator 111a works and the evaporator 111b performs defrosting; and the evaporator 111b works and the evaporator 111a performs defrosting.
The working principle of an embodiment of the refrigeration display cabinet will be described in the following with reference to
When the refrigeration display cabinet runs normally, condensed refrigerant in the refrigeration loop 110 flows through the throttling elements 115a, 115b respectively for expansion and throttling, and then flows into the evaporators 111a, 111b for evaporation and refrigeration. Moreover, after refrigeration is completed, the refrigerant flows back to the compressor to participate in the next cycle. On the other hand, driven by an evaporator fan 113, the air flows through the evaporators 111a, 111b to perform heat exchange with the refrigerant flows through the evaporators. The cooled air is guided from the back of the display cabinet to the top of the display cabinet, and is then blown out from top to bottom at the front side of the display cabinet to form an air curtain 121, so as to isolate the interior of the display space 120 from the ambient heat to some extent.
When a part of the evaporators in the refrigeration display cabinet performs defrosting, e.g., when the evaporator 111a needs to perform defrosting, in this case, the solenoid valve 114a is turned off and the solenoid valve 114b is kept on, such that the evaporator 111b is still in an operating state, thus ensuring that no excessive temperature fluctuation will be caused in the display space during defrosting. The water from melted frost during defrosting of the evaporator 111a will drop on the partition board 112 and then drained by the gutters 112a, 112b disposed at two sides, thus avoiding affecting the evaporator 111b underneath.
The foregoing examples mainly describe a refrigeration display cabinet of the utility model. Although some implementations of the present invention are described, those of ordinary skill in the art should understand that the present invention can be implemented in many other forms without departing from the essence and scope of the present invention. Therefore, the examples and implementations displayed are considered as schematic rather than limitative. The present invention may cover various modifications and replacements without departing from the spirit and scope of the present invention as defined in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201720817201.X | Jul 2017 | CN | national |
