Freezing and cold storage free switching refrigerator

Abstract

The utility model discloses a refrigerator capable of freely switching freezing and refrigerating. A refrigerating system comprises a first compressor, a second compressor, a condenser, a drying filter, a throttling valve and an evaporator. A refrigerant outlet of the first compressor is sequentially connected with the condenser, the drying filter, the throttling valve and the evaporator. The second compressor is connected with the first compressor in parallel; the control system comprises a knob switch, a first temperature controller, a second temperature controller, a first alternating current contactor, a second alternating current contactor, a third alternating current contactor, a heating pipe and a time delay relay. The refrigerating system has the advantages that only switching of freezing and refrigerating can be achieved only by shifting the knob switch, operation is easy and convenient, the whole system is achieved through the fact that the two compressors share one refrigerating pipeline, cost is lower, and efficiency is higher.

Description

Technical Field

[0001] The utility model relates to refrigeration equipment, in particular to a refrigerator suitable for free switching between freezing and refrigeration. Background Art

[0002] At present, the types of commercial display refrigerators in China are becoming more and more complete. Generally, refrigerators can be seen everywhere in supermarkets, convenience stores and even farmers' markets. There are generally two main types of refrigerators for food storage, one is a refrigerator and the other is a freezer. These two types of refrigerators can meet the storage conditions of most foods, but the storage space and refrigeration performance of these two types of refrigerators are certain. Once the merchant finds that the storage space of the freezer is not enough, but there is surplus space in the refrigerator, or the storage space of the refrigerator is insufficient, but there is surplus space in the freezer, in this case, the merchant can only re-purchase a new refrigerator to meet the demand. In other words, users cannot change the refrigeration or freezing function of the refrigerator by themselves, and it can only be used according to the factory settings.

[0003] To solve this problem, the prior art has introduced a freezer that uses an electronic thermostat to transform the freezer into a refrigerator. However, only professional staff can set the parameters of the electronic thermostat, and ordinary users cannot operate it, so it is not very popularizable. In addition, this solution can only transform a freezer into a refrigerator, but not vice versa, so it has obvious limitations.

[0004] Another solution is to build two refrigeration systems and two control systems into one refrigerator, so that users can choose to run one of the refrigeration systems at any time to switch between the freezing and refrigeration functions. However, in this solution, the two systems work independently and do not interfere with each other, which is costly and inefficient. Summary of the invention

[0005] The utility model aims to provide a refrigerator with free switch between freezing and refrigeration, which realizes free switch between freezing and refrigeration at any time, and has simple operation, low cost and high efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The refrigerator with free switching between freezing and refrigeration described in the utility model has a refrigeration system comprising a first compressor, a second compressor, a condenser, a drying filter, a throttle valve and an evaporator; the refrigerant outlet of the first compressor is connected to the condenser, the drying filter, the throttle valve and the evaporator in sequence; the second compressor is connected in parallel with the first compressor;

[0008] The control system includes a knob switch, a first thermostat, a second thermostat, a first AC contactor, a second AC contactor, a third AC contactor, a heating tube and a time delay relay;

[0009] The first contact of the knob switch is connected to the first thermostat, and the second contact is connected to the second thermostat; the first terminals of the first thermostat and the second thermostat are connected to the evaporator; the second terminals are connected to the first AC contactor; the first terminal of the first AC contactor is respectively connected to the first compressor and the condenser, and the second terminal is connected to the second AC contactor through a delay relay to control the second compressor; the third terminal of the second thermostat is connected to the third AC contactor to control the heating tube.

[0010] Furthermore, when the knob switch is in normal state, the third contact is closed and the refrigerator stops working; when the first contact is closed, the refrigerator enters the refrigeration mode; when the second contact is closed, the refrigerator enters the freezing mode.

[0011] Furthermore, in the refrigeration mode, the first thermostat is powered on, and the evaporator connected to the first terminal of the first thermostat starts to work; when the temperature control probe of the first thermostat detects that the temperature of the refrigerator is higher than the first preset temperature, the first AC contactor connected to the second terminal of the first thermostat is powered on; the first terminal of the first AC contactor controls the operation of the first compressor and the condenser; the second terminal of the first AC contactor controls the closing of the delay relay; after the closing time of the delay relay reaches the first delay time, the second AC contactor is powered on to control the operation of the second compressor; when the temperature control probe of the first thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor is powered off to enter the shutdown mode.

[0012] Furthermore, in the freezing mode, the second thermostat is powered on, and the evaporator connected to the first terminal of the second thermostat starts to work; when the temperature control probe of the second thermostat detects that the temperature of the refrigerator is higher than the second preset temperature, the first AC contactor connected to the second terminal of the second thermostat starts to work; the first terminal of the first AC contactor controls the operation of the first compressor and the condenser; the second terminal of the first AC contactor controls the closing of the delay relay; after the closing time of the delay relay reaches the first delay time, the second AC contactor is powered on, and after the closing time of the delay relay reaches the second delay time, the second AC contactor is powered on to control the operation of the second compressor; when the temperature control probe of the second thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor is powered off to enter the shutdown mode.

[0013] Furthermore, the time delay relay cannot be closed during the defrosting operation time of the refrigerator.

[0014] Furthermore, electric heating is used for defrosting in freezing mode.

[0015] The utility model has the advantages that the freezing and refrigeration can be switched only by turning the knob switch, the operation is simple and convenient, and the whole system is realized by two compressors sharing a set of refrigeration pipelines, so the cost is lower and the efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the refrigeration system of the utility model.

[0017] Figure 2 It is a schematic diagram of the control system of the utility model.

[0018] Figure 3 It is a circuit embodiment of the control system described in the utility model. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The freezer with free switching between freezing and refrigeration described in the utility model is as follows: Figure 1 As shown, the refrigeration system includes a first compressor M1, a second compressor M2, a condenser 3, a drying filter 4, a throttle valve 5 and an evaporator 6; the refrigerant outlet of the first compressor M1 is connected to the condenser 3, the drying filter 4, the throttle valve 5 and the evaporator 6 in sequence; the second compressor M2 is connected in parallel with the first compressor M1.

[0021] The control system of the freezer with free switching between freezing and refrigeration described in the utility model comprises a knob switch SA, a first thermostat, a second thermostat, a first AC contactor KM1, a second AC contactor KM2, a third AC contactor KM3, a heating tube R1 and a time delay relay KT.

[0022] When the knob switch SA is in normal state, the third contact is closed and the refrigerator stops working. When the first contact is closed, the refrigerator enters the refrigeration mode; when the second contact is closed, the refrigerator enters the freezing mode.

[0023] The first contact of the knob switch SA is connected to the first thermostat. The first terminal of the first thermostat is connected to the evaporator 6. The second terminal of the first thermostat is connected to the first AC contactor KM1. The first terminal of the first AC contactor KM1 is respectively connected to the first compressor M1 and the condenser 3. The second terminal of the first AC contactor KM1 is connected to the time delay relay KT. The time delay relay KT is connected to the second AC contactor KM2 to control the second compressor M2.

[0024] The second contact of the knob switch SA is connected to the second thermostat. The first terminal of the second thermostat is connected to the evaporator 6. The second terminal of the second thermostat is connected to the first AC contactor KM1. The first terminal of the first AC contactor KM1 is respectively connected to the first compressor M1 and the condenser 3. The second terminal of the first AC contactor KM1 is connected to the delay relay KT. The delay relay KT is connected to the second AC contactor KM2 to control the second compressor M2. The third terminal of the second thermostat is connected to the third AC contactor KM3 to control the heating tube R1.

[0025] When the first contact of the knob switch SA is closed and the refrigerator enters the refrigeration mode, the first thermostat is powered on, and the evaporator 6 connected to the first terminal of the first thermostat starts to work. When the temperature control probe of the first thermostat detects that the temperature of the refrigerator is higher than the first preset temperature, the first AC contactor KM1 connected to the second terminal of the first thermostat is powered on, and the first compressor M1 and condenser 3 connected to the first terminal of the first AC contactor KM1 start to work. At this time, the delay relay KT connected to the second terminal of the first AC contactor KM1 is closed and starts to work. When the closing time of the delay relay KT reaches the first delay time, the second AC contactor KM2 connected to the delay relay KT is powered on, so that the second compressor M2 works.

[0026] When the temperature control probe of the first thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor KM1 is powered off, the first compressor M1 and condenser 3 stop working, the delay relay KT is disconnected, the second compressor M2 also stops working, and the entire refrigerator enters shutdown mode.

[0027] When the refrigerator is operated in the refrigeration mode for a certain period of time, it will automatically enter the shutdown defrosting stage. In the shutdown defrosting stage, the first compressor M1 and condenser 3 stop working, the delay relay KT is disconnected, and the second compressor M2 also stops working. The entire refrigerator enters shutdown and defrosts by relying on heat exchange between the refrigerator and the outside world. At the same time, during the shutdown defrosting period, when the temperature control probe of the first thermostat detects that the temperature of the refrigerator rises and is higher than the first preset temperature, the first AC contactor KM1 still cannot be powered on until the shutdown defrosting period ends.

[0028] When the second contact of the knob switch SA is closed and the refrigerator enters the freezing mode, the second thermostat is powered on, and the evaporator 6 connected to the first terminal of the second thermostat starts to work. When the temperature control probe of the second thermostat detects that the temperature of the refrigerator is higher than the second preset temperature, the first AC contactor KM1 connected to the second terminal of the second thermostat is powered on, and the first compressor M1 and condenser 3 connected to the first terminal of the first AC contactor KM1 start to work. At this time, the delay relay KT connected to the second terminal of the first AC contactor KM1 is closed and starts to work. When the closing time of the delay relay KT reaches the second delay time, the second AC contactor KM2 connected to the delay relay is powered on, so that the second compressor M2 works.

[0029] When the temperature control probe of the second thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor KM1 is powered off, the first compressor M1 and the condenser 3 stop working, the delay relay KT is disconnected, the second compressor M2 also stops working, and the entire refrigerator enters the shutdown mode.

[0030] When the freezer operates in the freezing mode for a certain period of time, it will automatically enter the shutdown defrosting stage. In the shutdown defrosting stage, the first compressor M1 and condenser 3 stop working, the delay relay KT is disconnected, the second compressor M2 also stops working, and the entire freezer enters shutdown. However, unlike the refrigeration mode, the freezing system generally uses electric heating for defrosting. The third terminal of the second thermostat is connected to the third AC contactor KM3, which is used to control the heating tube R1 to achieve electric heating defrosting.

[0031] During the defrosting period of the refrigerator in the freezing or refrigeration mode, even if the temperature control probe of the first thermostat detects that the temperature of the refrigerator rises and is higher than the second preset temperature or the first preset temperature, the first AC contactor KM1 cannot be powered on and can only resume normal operation after the defrosting period ends.

[0032] The utility model realizes free switching of the freezing and refrigerating functions of a single refrigerator through a set of refrigeration system and two sets of control systems, which greatly meets the usage needs of customers in different scenarios and has lower costs.

[0033] At the same time, in the utility model, the application of the delay relay KT is very clever. In the refrigeration mode, when the delay time of the delay relay KT is set to be relatively short, the first compressor M1 and the second compressor M2 can cool the system together, greatly improving the refrigeration speed of the refrigeration mode. When the delay time of the power-on delay relay is set to be relatively long (that is, the delay time is greater than the time required to use a single compressor to cool the refrigerator and pull the refrigerator temperature to the shutdown temperature value set by the system), the load end of the delay relay KT will never be powered, that is, the coil of the second AC contactor KM2 will never be powered, and the second compressor M2 will never operate. At this time, the refrigeration mode will always be provided by the single first compressor M1. Although the refrigeration speed of a single compressor is reduced, there will be a significant improvement in energy saving.

[0034] like Figure 3 As shown, it is a specific circuit connection embodiment of the control system of the utility model. Among them, XP1 is a terminal block, Evap is an evaporator probe, Room is a thermostat temperature probe, SA is a knob switch, KT is a power-on delay relay, F1 represents an evaporating fan, and F2 represents a condensing fan. M1 and M2 are the first compressor and the second compressor respectively. QF is a leakage protector. R1 is a heating tube. KM1 is an AC contactor for the first compressor, KM2 is an AC contactor for the second compressor, and KM3 is an AC contactor for defrosting.

[0035] Figure 3 In the figure, thermostat 1 is the controller of the refrigeration system, and thermostat 2 is the controller of the freezing system. Thermostat 1 and thermostat 2 realize the switching of refrigeration and freezing functions through the knob switch SA. Under normal conditions, the knob switch SA is in the middle, and both thermostats 1 and 2 are not powered, and the refrigeration system does not work.

[0036] When the knob switch SA is turned to the side of thermostat 1, thermostat 1 is energized, the refrigeration system starts working, the Fan contact in thermostat 1 is closed, and the evaporating fan F1 of the refrigerator starts to run. When the refrigerator temperature detected by the temperature control probe Room of thermostat 1 is higher than the startup temperature value set by the system, the Comp contact in thermostat 1 is closed, the coil of AC contactor KM1 is energized, and the main contacts of AC contactor KM1 are closed. On the one hand, the load compressor M1 and the condensing fan F2 start to run, and the system starts refrigeration. On the other hand, the coil of the power-on delay relay KT is energized and starts working. After a period of time (KT delay time), the load end of the power-on delay relay KT is energized, thereby energizing the coil of AC contactor KM2, and then the main contacts of AC contactor KM2 are closed, and compressor M2 also starts to work. At this time, the entire refrigeration system is fully turned on, and the refrigerator enters a fast In cooling mode, according to the parameter setting value of thermostat 1, when the temperature of the refrigerator detected by the temperature control probe Room of thermostat 1 is lower than the shutdown temperature value set by the system, the Comp contact of thermostat 1 is disconnected, the coil of AC contactor KM1 is de-energized, and the main contact of AC contactor KM1 is disconnected. On the one hand, the compressor M1 and the condensing fan F2 stop running, and on the other hand, the coil of the power-on delay relay KT is de-energized, and the load end of KT is also disconnected, thereby de-energizing the coil of AC contactor KM2, disconnecting the main contact of AC contactor KM2, and compressor M2 also stops working. At this time, the cooling of the entire system is turned off, and the temperature of the refrigerator will continue to rise because of heat exchange with the outside world. When and only when the temperature of the refrigerator returns to the startup temperature value set by the system, the Comp contact of thermostat 1 is closed again, and cooling begins. The above process is repeated over and over again to meet the customer's refrigeration needs.

[0037] When the knob switch SA is turned to the side of thermostat 2, thermostat 2 is energized, thermostat 1 is de-energized, and the refrigeration system starts to work. The Fan contact in thermostat 2 is closed, and the evaporating fan F1 of the freezer starts to run. When the temperature of the freezer detected by the temperature control probe Room of thermostat 2 is higher than the system-set startup temperature value, the Comp contact in thermostat 2 is closed, the coil of AC contactor KM1 is energized, and the main contact of AC contactor KM1 is energized. Then the load compressor M1 and the condensing fan F2 start to run. After a while, the load compressor M2 also starts to run, which is basically the same as the opening and closing process of the above refrigeration system.

Claims

1. A refrigerator with free switching between freezing and refrigeration, characterized in that: The refrigeration system comprises a first compressor, a second compressor, a condenser, a drying filter, a throttle valve and an evaporator; the refrigerant outlet of the first compressor is connected to the condenser, the drying filter, the throttle valve and the evaporator in sequence; The second compressor is connected in parallel with the first compressor; The control system includes a knob switch, a first thermostat, a second thermostat, a first AC contactor, a second AC contactor, a third AC contactor, a heating tube and a time delay relay; The first contact of the knob switch is connected to the first thermostat, and the second contact is connected to the second thermostat; the first terminals of the first thermostat and the second thermostat are connected to the evaporator; The second terminal is connected to the first AC contactor; the first terminal of the first AC contactor is respectively connected to the first compressor and the condenser, and the second terminal is connected to the second AC contactor through a delay relay to control the second compressor; the third terminal of the second thermostat is connected to the third AC contactor to control the heating tube.

2. A freezer with free switching between freezing and refrigeration according to claim 1, characterized in that: When the knob switch is in normal state, the third contact is closed and the refrigerator stops working; when the first contact is closed, the refrigerator enters the refrigeration mode; when the second contact is closed, the refrigerator enters the freezing mode.

3. A freezer with free switching between freezing and refrigeration according to claim 2, characterized in that: In the refrigeration mode, the first thermostat is powered on, and the evaporator connected to the first terminal of the first thermostat works; when the temperature control probe of the first thermostat detects that the temperature of the refrigerator is higher than the first preset temperature, the first AC contactor connected to the second terminal of the first thermostat is powered on; the first terminal of the first AC contactor controls the first compressor and the condenser to work; the second terminal of the first AC contactor controls the delay relay to close; after the closing time of the delay relay reaches the first delay time, the second AC contactor is powered on to control the second compressor to work; When the temperature control probe of the first thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor is powered off and enters the shutdown mode.

4. A freezer capable of switching between freezing and refrigeration according to claim 2, characterized in that: In the freezing mode, the second thermostat is powered on, and the evaporator connected to the first terminal of the second thermostat works; when the temperature control probe of the second thermostat detects that the temperature of the refrigerator is higher than the second preset temperature, the first AC contactor connected to the second terminal of the second thermostat is powered on; the first terminal of the first AC contactor controls the first compressor and the condenser to work; the second terminal of the first AC contactor controls the delay relay to close; After the closing time of the delay relay reaches the first delay time, the second AC contactor is powered on, and after the closing time of the delay relay reaches the second delay time, the second AC contactor is powered on to control the second compressor to work; When the temperature control probe of the second thermostat detects that the temperature of the refrigerator is lower than the preset shutdown temperature, the first AC contactor is powered off and the refrigerator enters the shutdown mode.

5. A freezer capable of switching between freezing and refrigeration according to claim 4 or 3, characterized in that: When the freezer is in shutdown and defrosting mode, the delay relay cannot be closed.

6. The freezer with free switching between freezing and refrigeration according to claim 2, characterized in that: Electric heating is used for defrosting in freezing mode.

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