CN104236150B - The structure of the freezer - Google Patents

Abstract

A structure of a refrigerator comprises a freezing device and a defrosting device; the refrigerating device comprises a compressor, a condenser, a first passage, a liquid receiver, a heat exchanger, a second passage, a first refrigerating electromagnetic valve, a first expansion valve, a pipe-cooled evaporator, a fifth passage, a third passage, a second refrigerating electromagnetic valve, a second expansion valve, an eighth passage, an air-cooled evaporator and a fourth passage; the defrosting device is provided with a microswitch, a garage door opening relay, a high-low pressure switch, a compressor electromagnetic switch, a time delay relay, a setting timer, a defrosting conversion contactor, a seventh passage and a defrosting resetting temperature switch; through the structure, the air-cooled evaporator can absorb hot air entering the warehouse entry and steam carried by the hot air, so that the freezing capacity and efficiency in the warehouse entry are improved.

Description

The structure of the freezer

technical field

The invention relates to a structure of a refrigerator, especially capable of absorbing hot air entering the storage body and the moisture carried by it, so as to improve the freezing capacity and efficiency of the storage body.

Background technique

A general refrigeration/storage system mainly includes a compressor, a condenser, an expansion valve and an evaporator, which are connected by pipelines to form a closed circuit that can provide refrigerant circulation; wherein, the evaporator is located in the refrigeration/storage Indoors, through the delivery of the compressor, the liquid refrigerant entering the evaporator absorbs the heat in the freezing/storage room due to low-temperature evaporation, so that the freezing/storage room forms a low-temperature state, so as to achieve freezing/ Hidden purpose. The evaporator was an air-cooled evaporator in the early days. It is equipped with a circulating fan to force the air circulation to drive the air flow, so that the air in the freezer/storage room and the heat exchange coil in the air-cooled evaporator are carried out. Heat exchange, because the motor of the circulation fan will generate heat, and the airflow sent by the circulation fan will also generate heat due to friction, which will cause the temperature in the freezer/storage room to rise. Therefore, the freezer/storage system must be continuously The operation is used to cool down and there is a lack of very power consumption; moreover, it uses a circulating fan to force the air to circulate, so the temperature between the air outlet and the air inlet will have a temperature difference of 4 degrees Celsius and the lack of temperature unevenness; based on the above-mentioned many In recent years, the air-cooled evaporator has been replaced by a tube-cooled evaporator; the tube-cooled evaporator is fixed above the freezer/storage room with a pipe for the flow of liquid refrigerant and several radial intervals The fins arranged on the outer surface of the pipe, so the two side surfaces of several fins and the outer surface of the pipe can provide cold energy to exchange heat with the refrigerated food placed in the freezing/storage chamber; The pipes are fixed in every area above the freezer/storage room, and the cold air naturally descends to achieve a comprehensive and uniform cooling effect. Therefore, if there is a tube-cooled evaporator in the freezer/storage room, there is no need to use a circulating fan, so , to effectively solve the lack of the above-mentioned air-cooled evaporator; however, since the temperature of the two side surfaces of several fins and the outer surface of the pipe is about -20°C to -50°C, both can provide cold energy and place in the freezer/ The refrigerated food in the storage room undergoes heat exchange. Therefore, when the door of the freezer/storage room is opened and the hot air entering the room, the water vapor it carries and the moisture of the food to be frozen will be on the two side surfaces of the fins and the pipe. The outer surface of the fins condenses into frost, which will gradually accumulate as a layer of barriers and affect the efficiency of heat exchange; therefore, in order to maintain the normal operation of the freezing/storage system, it is necessary to timely adjust the distance between the two side surfaces of several fins and the pipes. Defrost operation on the outer surface. The current defrosting methods for the two side surfaces of several fins and the outer surface of the pipe include the compressor stop method, the hot gas defrost method (Hot gas defrost) and the sprinkler defrost method. It is not ideal if the ground is wet and the refrigerated food is injured by falling frost. Therefore, how to absorb the hot air entering the storage body and the water vapor and the moisture of the object to be frozen, so as to improve the freezing ability and efficiency of the refrigerator and improve the defrosting efficiency, effectively solve the above-mentioned shortcomings, has become the research and development of the present invention. The motivation to create.

Contents of the invention

The inventor has accumulated many years of experience in manufacturing refrigeration equipment, and through repeated tests and improvements, finally the structure of a refrigerator of the present invention is born. The main purpose of the present invention is to provide a structure of a freezer that can absorb the hot air entering the storage body and the moisture and moisture of the object to be frozen to improve the freezing capacity and efficiency of the freezer. .

In order to achieve the above object, the technical means adopted in the present invention are: a structure of a freezer, comprising a freezer and a defrosting device; the freezer includes a compressor with an output end and an input end, an input end and an input end A condenser at the output end, a first passage connecting the output end of the compressor and the input end of the condenser, a liquid receiver with an input end and an output end, a heat exchanger, a second passage, and a The first refrigeration solenoid valve with two passages, a first expansion valve fixed in the second passage and located downstream of the first refrigeration solenoid valve, a tube-cooled evaporator communicating with the downstream of the first expansion valve, and a tube-cooled evaporator connected to the downstream of the first expansion valve A fifth passage communicated downstream of the cold evaporator, a third passage communicated with the second passage and located upstream of the first refrigeration solenoid valve, a second refrigeration solenoid valve fixed on the third passage, a second refrigeration solenoid valve fixed on the second passage The second expansion valve with three passages and located downstream of the second refrigeration solenoid valve, an eighth passage communicated with the downstream of the second expansion valve, an air-cooled evaporator communicated with the downstream of the eighth passage, and an air-cooled evaporator communicated with the downstream of the eighth passage The downstream of the evaporator and the fourth path of the fifth path, and a temperature switch in the storeroom with a first junction and a second junction; wherein, the input end of the liquid reservoir communicates with the output end of the condenser, and the liquid storage The output end of the device communicates with the second passage, or the output end of the liquid reservoir communicates with the input pipe of the outer barrel of the heat exchanger; Inner barrel; the upper end of the outer barrel is provided with an input pipe that can be connected with the output end of the liquid reservoir, and the lower end of the outer barrel is provided with an output pipe; the upper end of the inner barrel is provided with an input pipe that communicates with the fifth passage And an output pipe connected with the input end of the compressor; the tube-cooled evaporator is fixed by a pipe, several radial fins integrally formed on the outer wall of the pipe and a combination of pipe or fin It is composed of a fixed frame on the top surface of the freezer; one end of the pipe is connected with the downstream of the first expansion valve, and the other end of the pipe is connected with the fifth passage; the air-cooled evaporator mainly includes a A cabinet on the top surface of the warehouse, a plurality of fans fixed on the cabinet, a copper pipe row fixed on the cabinet, and a water collection tray fixed on the bottom of the cabinet with a drain pipe; The copper pipe row is located behind the fan, and the refrigerant pipe is inserted horizontally into the copper pipe row, and the refrigerant compressed by the compressor is introduced into the refrigerant pipe from above; the water collecting plate is arranged at the bottom of the box. Through the setting of the water collection tray, the water can be collected and discharged through the drain pipe; and the pipe fittings of the tube-cooled evaporator are fixed with a first one for detecting the temperature of the refrigerant in the refrigerant passage of the tube-cooled evaporator. contact and a temperature switch in the storeroom of a second contact; and, the tube-cooled evaporator is additionally provided with a sixth passage communicating with the first refrigeration solenoid valve and the first expansion valve of the second passage, and a sixth passage located downstream of the sixth passage. The third expansion valve and a first tube-cooled evaporator connected downstream of the third expansion valve; the first tube-cooled evaporator is composed of a tube and several integrally formed on the outer wall of the tube to form a radial pattern The fins are combined with a tube or fin for the first tube-cooled evaporator to be fixed on the top of the freezer. One end of the pipe fitting of the first tube-cooled evaporator communicates with the downstream of the third expansion valve, and the other end of the pipe fitting of the first tube-cooled evaporator communicates with the fifth passage; the defrosting device It has a micro switch with a first contact and a second contact, a warehouse door opening relay with a coil, a first contact, a second contact, a third contact and a fourth contact, a high and low pressure switch, a compressor electromagnetic switch with an overload protector and a coil and electrically connected, a delay relay with a contact, a setting timer with a first contact and a second contact, a set timer with a A defrosting timer with a first contact and a second contact, a defrosting conversion contactor with a coil, a first contact, a second contact, a third contact and a fourth contact, a defrosting switch fixed The solenoid valve is used to block or not block the seventh path of the high-pressure high-temperature gaseous refrigerant in the seventh path, and a defrosting reset temperature switch with a fixed contact, a first contact and a second contact; The switch is set at the entrance of the warehouse body, and the first contact of the micro switch is electrically connected with the coil of the warehouse door opening relay, the first contact of the warehouse door opening relay, the contact of the delay relay and the second contact of the warehouse door opening relay; The second contact of the automatic switch is electrically connected with the delay relay and the contact of the delay relay; the contact of the delay relay is electrically connected with the first contact of the opening door relay; The solenoid valve and the fan of the condenser and the third contact of the opening door relay are electrically connected with the first setting timer and the defrosting timer and the defrosting solenoid valve and the coil of the defrosting conversion contactor. The conduction or non-conduction of the first contact of the timer makes the second refrigeration solenoid valve actuate and opens or closes the third passage; the third contact of the opening door relay is connected with the first contact of the setting timer The second contact of the fixed timer is electrically connected with the fan of the air-cooled evaporator, the high and low pressure switch, and the temperature switch in the warehouse; the second contact of the timer is electrically connected with the fourth contact of the open warehouse door relay, and the opening The fourth contact of the warehouse door relay is electrically connected with the first refrigeration solenoid valve, and the first refrigeration solenoid valve can be activated to open or close the second refrigeration solenoid valve due to the conduction or non-conduction of the second contact of the timer. Two channels; the high and low pressure switch is electrically connected to the temperature switch in the warehouse and the contacts of the door opening relay, the coil of the compressor electromagnetic switch and the overload protector; the first contact of the defrosting timer is connected to the first contact of the defrosting reset temperature switch. The contacts are electrically connected with the first contact of the defrost conversion contactor and the third contact of the defrost conversion contactor; the second contact of the defrost timer is electrically connected with the fourth contact of the defrost conversion contactor; the defrost conversion The first contact of the contactor is electrically connected to the fixed contact of the defrost reset temperature switch, the first contact of the defrost reset temperature switch and the third contact of the defrost transfer contactor; the second contact of the defrost transfer contactor is connected to the second contact of the defrost transfer contactor. 2. The cooling solenoid valve is electrically connected with the fan of the condenser and the fan of the air-cooled evaporator and the fourth contact of the defrosting conversion contactor; the third contact of the defrosting conversion contactor is electrically connected with the defrosting solenoid valve; defrosting The coil of the changeover contactor and the The fixed contact of the defrosting reset temperature switch is electrically connected to the first contact of the defrosting conversion contactor; the first end of the seventh path communicates with the first path between the refrigeration compressor and the condenser; the seventh path The second end of the second end communicates with the eighth passage between the second expansion valve and the air-cooled evaporator, and the defrosting solenoid valve can be activated because of the conduction or non-conduction of the first contact of the defrost timer and open or close the seventh passage; and, the compressor electromagnetic switch coil and micro switch, open warehouse door relay coil, high and low pressure switch, delay relay, setting timer, defrosting timer, defrosting conversion contactor , There is a manual selection switch between the defrosting solenoid valve and the temperature switch in the warehouse.

The present invention does not cause the ground in the freezer/storage chamber to be wet, nor does it cause the refrigerated food to be injured by falling frost lumps, which is very ideal.

Description of drawings

Fig. 1: the system diagram of freezer structure of the present invention;

Fig. 2: the right side view of freezing/preserving room of the present invention;

Figure 3: Sectional view of line 3-3 in Figure 2;

Fig. 4: The circuit diagram of the freezing operation of the tube-cooled evaporator of the present invention;

Fig. 5: the circuit diagram of the freezing operation of the air-cooled evaporator whose door is opened in the freezer/store room of the present invention;

Fig. 6: the circuit diagram of the freezing operation of the air-cooled evaporator whose door is closed in the freezer/store room of the present invention;

Fig. 7: The circuit diagram of the freezing operation of the air-cooled evaporator of the present invention;

Fig. 8: The circuit diagram of defrosting operation work of the present invention;

Fig. 9: The circuit diagram of the freezing operation of the air-cooled evaporator completed by defrosting in the present invention;

Fig. 10: The circuit diagram of the non-refrigerated operation of the present invention.

Explanation of reference signs:

1 freezing device; 111 output end; 112 input end; 11 compressor; 121 input end 122 output end; 12 condenser; 10a first passage; 10b second passage; 10c third passage; 10d fourth passage; 10e fifth 10f sixth passage; 10g eighth passage; 13 liquid reservoir; 131 input end; 132 output end; 14 heat exchanger; 141 outer barrel; 142 inner barrel; 143 input pipe; 144 output pipe; ; 146 output pipe; 15a the first refrigeration solenoid valve; 15b the second refrigeration solenoid valve; 16a the first expansion valve; 16b the second expansion valve; 16c the third expansion valve; 17 fan; ; 182 second contact; 2 tube cold evaporator; 21 pipe fittings; 22 fins; 23 fixed frame; 2a first tube cooled evaporator; 21a pipe fittings; ; 31 cabinet; 32 fan; 33 copper pipe row; 34 water collecting tray; 35 drain pipe; 4 defrosting device; 41 micro switch; 411 first contact; 412 second contact; 423 second contact; 424 third contact; 425 fourth contact; 43 high and low pressure switch; 441 overload protector; 442 compressor electromagnetic switch coil; 443 compressor electromagnetic switch contact; 45 delay relay; 451 delay Timer relay contact; 46 setting timer; 461 first contact; 462 second contact; 47 defrosting timer; 471 first contact; 472 second contact; 480 defrosting conversion contactor coil; 481 defrosting conversion contactor The first contact; 482 the second contact of the defrosting conversion contactor; 483 the third contact of the defrosting conversion contactor; 484 the fourth contact of the defrosting conversion contactor; 49 the seventh channel; 490 the defrosting solenoid valve; 491 the first end; 492 second end; 400 fixed contact; 401 first contact; 402 second contact; 40 defrosting reset temperature switch; 5 freezer; 6 manual selection switch.

detailed description

In order to make the foregoing and other objects, features and advantages of the present invention more clearly understood, preferred embodiments of the present invention will be described in detail below together with the accompanying drawings. Please refer to Fig. 1, 2, 3 and shown in Fig. 10, the present invention mainly provides the structure of a kind of refrigerator, comprises a freezing device 1 and a defrosting device 4; A compressor 11 with an input end 112, a condenser 12 provided with an input end 121, an output end 122 and a fan 17, a first passage connecting the output end 111 of the compressor 11 and the input end 121 of the condenser 12 10a, a liquid receiver 13 with an input port 131 and an output port 132, a liquid refrigerant that can provide a lower temperature condensation to enter the expansion valves 16a, 16b, 16c and a superheated vaporized refrigerant that can enter the compressor 11 A heat exchanger 14, a second passage 10b, and a first refrigeration unit that is fixed at an appropriate place in the second passage 10b so as to block or not block the flow of the refrigerant in the second passage 10b to the tube-cooled evaporator 2 Solenoid valve 15a, a first expansion valve 16a that is fixed in the second passage 10b and located at an appropriate place downstream of the first refrigeration solenoid valve 15a and can expand the liquid refrigerant, and a first expansion valve 16a that communicates with the downstream of the first expansion valve 16a The tube-cooled evaporator 2, a fifth passage 10e communicating with the downstream of the tube-cooling evaporator 2, a third passage 10c communicating with the second passage 10b and located at an appropriate upstream of the first refrigeration solenoid valve 15a, a A second refrigeration solenoid valve 15b fixed at an appropriate place in the third passage 10c to block or not block the flow of refrigerant in the third passage 10c to the air-cooled evaporator 3, a second refrigeration solenoid valve 15b fixed in the third passage 10c and A second expansion valve 16b that is located downstream of the second refrigeration solenoid valve 15b and can expand the liquid refrigerant, an eighth passage 10g communicating with the downstream of the second expansion valve 16b, and an eighth passage 10g downstream of the eighth passage 10g A connected air-cooled evaporator 3, a fourth passage 10d communicating with the downstream of the air-cooled evaporator 3 and the fifth passage 10e, and a temperature switch 18 in the storehouse with a first contact 181 and a second contact 182; Wherein, the input end 131 of the liquid reservoir 13 communicates with the output end 122 of the condenser 12, and the output end 132 of the liquid reservoir 13 communicates with the second path 10b, or as shown in FIG. 132 communicates with the input pipe 143 of the outer barrel body 141 of the heat exchanger 14; the heat exchanger 14 includes an outer barrel body 141 for storing the low-temperature liquid refrigerant from the liquid receiver 13 and an outer barrel body 141 fixed on the outer barrel body. The airtight container on the upper end surface of the body 141 is used to store the high-temperature gaseous refrigerant from the fifth passage 10e as the inner barrel body 142 of the gas-liquid separator; The connected input pipe 143, the lower end surface of the outer barrel body 141 is provided with an output pipe 144 that can communicate with the expansion valves 16a, 16b, 16c, so that the liquid refrigerant in the liquid receiver 13 can enter the expansion valves 16a, 16b through the outer barrel body 141 , 16c; the upper end of the inner barrel body 142 is provided with an input pipe 145 communicating with the fifth passage 10e and a pressure The output pipe 146 connected to the input end 112 of the compressor 11 allows the low-temperature gaseous refrigerant from the tube-cooled evaporator and the air-cooled evaporator 3 to enter the inner barrel body 142 through the fifth passage 10e and the input pipe 145, and then pass through the output pipe 146, The input end 112 of the compressor 11 enters the compressor 11, so that the refrigerant in the outer barrel body 141 and the inner barrel body 142 performs heat exchange in the heat exchanger 14 to save energy; the tube-cooled evaporator 2 is provided by a The pipe fitting 21 through which the liquid refrigerant circulates, several radial fins 22 integrally formed on the outer wall of the pipe fitting 21, and a fixing frame 23 fixed on the top surface of the freezer 5 for combining the pipe fitting 21 or the fin 22 One end of the pipe fitting 21 communicates with the downstream of the first expansion valve 16a, and the other end of the pipe fitting 21 communicates with the fifth passage 10e, so that when the expanded liquid refrigerant passes through the pipe fitting 21, the outer surface of the pipe fitting 21 and several fins The two side surfaces of 22 can provide cold energy to exchange heat with the refrigerated food placed in the freezer/store room; the air-cooled evaporator 3 is the same as the above-mentioned existing structure, and mainly includes a A box body 31 on the top surface, a plurality of fans 32 fixed on the box body 31, a copper tube row 33 fixed in the box body 31 and a drain pipe 35 fixed at the bottom of the box body 31 The water collection tray 34; the copper pipe row 33 is located behind the fan 32, and the refrigerant pipe is horizontally penetrated into the copper pipe row 33, and the refrigerant compressed by the compressor 11 is introduced into the refrigerant pipe from above; The tray 34 is arranged at the bottom of the box body 31, through the arrangement of the water collecting tray 34, the water can be collected and drained by the drain pipe 35;

Also, as shown in Figures 1 and 10, the tube-cooled evaporator 2 is additionally provided with a sixth passage 10f communicating with the first refrigeration solenoid valve 15a and the first expansion valve 16a of the second passage 10b, and a sixth passage 10f located in the sixth passage. The third expansion valve 16c downstream of 10f communicates with a first tube-cooled evaporator 2a downstream of the third expansion valve 16c; The outer wall of the tube 21a is composed of radial fins 22a and a fixed frame 23a fixed on the top surface of the freezer for the tubes 21a or fins 22a of the first tube-cooled evaporator 2a; One end of the pipe fitting 21a of a tube-cooled evaporator 2a communicates with the downstream of the third expansion valve 16c, and the other end of the pipe fitting 21a of the first pipe-cooled evaporator 2a communicates with the fifth passage 10e;

The defrosting device 4 has a micro switch 41 with a first contact 411 and a second contact 412, a coil 421, a first contact 422, a second contact 423, a third contact 424 and a The opening relay of the fourth contact 425, a high and low pressure switch 43, a compressor electromagnetic switch with an overload protector 441 and a coil 442 and electrically connected, a delay relay 45 with a contact 451, a set There is a setting timer 46 with a first contact 461 and a second contact 462, a defrosting timer 47 with a first contact 471 and a second contact 472, a coil 480, a first contact 481 and a The second contact 482, a third contact 483, and a fourth contact 484 are defrosting conversion contactors, and a defrosting solenoid valve 490 is fixed to block or not block the high-pressure and high-temperature gaseous refrigerant in the seventh passage 49 The seventh channel 49 of circulation, one is provided with a fixed contact 400 and a first contact 401 and a second contact 402 defrost reset temperature switch 40; Turn on and form the first contact 411 circuit of this microswitch 41 and the connection of the second contact 412 circuit that forms this microswitch 41 because of the closing of storehouse door; The first contact 411 of microswitch 41 and Open warehouse door relay coil 421 and the first contact 422 of open warehouse door relay and the contact 451 of delay relay 45 and the second contact 423 of open warehouse door relay are electrically connected; The contact 451 of the relay 45 and the delay relay 45 is electrically connected; the contact 451 of the delay relay 45 is electrically connected with the first contact 422 of the door opening relay; the second contact 423 of the door opening relay is connected with the second freezing solenoid valve 15b and the fan 17 of the condenser 12 and the third contact 424 of the door opening relay and the first contact 461 of the setting timer 46 and the defrosting timer 47 and the defrosting solenoid valve 490 and the coil 480 of the defrosting conversion contactor Electrically connected, because the conduction or non-conduction of the first contact 461 of the timer 46 can be set, the second freezing solenoid valve 15b is actuated to open or close the third passage 10c; the third passage 10c of the open warehouse door relay The contact 424 is electrically connected with the first contact 461 of the setting timer 46 and the second contact 462 of the setting timer 46 and the fan 32 of the air-cooled evaporator 3, the high and low pressure switch 43 and the temperature switch 18 in the storehouse; The second contact 462 of the timer 46 is electrically connected with the fourth contact 425 of the door opening relay, and the fourth contact 425 of the door opening relay is electrically connected with the first freezing solenoid valve 15a. The conduction or non-conduction of the first refrigeration solenoid valve 15a is activated to open or close the second passage 10b; the high and low pressure switch 43 is connected to the temperature switch 18 in the storehouse and the contact 424 of the open storehouse door relay and the electromagnetic switch of the compressor The coil 442 is electrically connected to the overload protector 441; the first contact 4 of the defrost timer 47 71 is electrically connected with the first contact 401 of the defrosting reset temperature switch 40 and the first contact 481 of the defrosting conversion contactor and the third contact 483 of the defrosting conversion contactor; the second contact 472 of the defrosting timer 47 is connected with the The fourth contact 484 of the defrosting conversion contactor is electrically connected; the first contact 481 of the defrosting conversion contactor is connected with the fixed contact 400 of the defrosting reset temperature switch 40 and the first contact 401 of the defrosting reset temperature switch 40 and the defrosting The third contact 483 of the conversion contactor is electrically connected; the second contact 482 of the defrosting conversion contactor is in contact with the second freezing solenoid valve 15b and the fan 17 of the condenser 12 and the fan 32 of the air-cooled evaporator 3 and the defrosting conversion contact The fourth contact 484 of the defrosting switch is electrically connected; the third contact 483 of the defrosting switching contactor is electrically connected to the defrosting solenoid valve 490; the coil 480 of the defrosting switching contactor is connected to the fixed contact 400 of the defrosting reset temperature switch 40 and The first contact point 481 of the defrosting conversion contactor is electrically connected; the first end 491 of the seventh passage 49 communicates with the first passage 10a between the refrigeration compressor 11 and the condenser 12; the first end 491 of the seventh passage 49 The second end 492 communicates with the eighth passage 10g between the second expansion valve 16b and the air-cooled evaporator 3, and the defrosting can be performed because the first contact 471 of the defrosting timer 47 is conducting or not conducting. Solenoid valve 490 actuates and opens or closes the seventh passage 49; Again, as shown in Figure 10, this compressor electromagnetic switch coil 442 and micro switch 41, opening storehouse door relay coil 421, high and low pressure switch 43, delay relay 45. A manual selector switch 6 is arranged between the setting timer 46, the defrosting timer 47, the defrosting conversion contactor, the defrosting solenoid valve 490 and the temperature switch 18 in the storeroom, for manually controlling the device.

Hereby effect of the present invention is described in detail again as follows:

Please refer to Fig. 1 and Fig. 4, when the tube-cooled evaporator 2 is running and freezing, press the manual selection switch 6, the second contact 182 of the temperature switch 18 in the storehouse and the second contact 462 of the setting timer 46 are activated. connected, the first freezing solenoid valve 15a opens the second passage 10b and the third expansion valve 16c due to the power supply that sets the second contact 462 of the timer 46; at the same time, because the temperature switch 18 in the storage The second contact 182 is turned on and there is power to activate the high and low pressure switch 43 and the overload protector 441, and the compressor electromagnetic switch coil 442 is excited to start the compressor 11 to cool, so that the refrigerant is compressed by the compressor 11 and becomes The high-temperature and high-pressure gaseous refrigerant enters the condenser 12 through the first passage 10a to cool down into a high-pressure normal temperature liquid refrigerant, and then passes through the liquid receiver 13, the input pipe 143 and the output pipe 144 of the heat exchanger 14, the second passage 10b, The first refrigeration solenoid valve 15a enters the first expansion valve 16a and the third expansion valve 16c to expand and becomes a low-temperature and low-pressure liquid refrigerant, and then passes through the tube-cooled evaporator 2 and the first tube-cooled evaporator 2a, and the tube-cooled The evaporator 2 and the first tube-cooled evaporator 2a provide cold energy to exchange heat with the refrigerated food placed in the freezer/storage chamber, and then pass through the fifth passage 10e, the input pipe 145 and the output pipe 145 of the inner barrel 142 of the heat exchanger 14 The pipe 146 returns to the refrigerating compressor 11 to complete the refrigerating cycle of the tube-cooled evaporator 2 once.

Please refer to Fig. 1 and shown in Fig. 5, when the door of freezing/preserving room was opened, the first contact 411 of microswitch 41 was connected, and the second contact 412 of microswitch 41 was disconnected; , the open warehouse door relay coil 421 is excited due to energization, so that the first contact 422, the second contact 423 and the third contact 424 of the open warehouse door relay are connected, and the fourth contact 425 is disconnected; the first freezing solenoid valve 15a is closed because the fourth contact 425 is disconnected; the second refrigeration solenoid valve 15b has power to open the third passage 10c and start the condenser 12 because the first contact 422, the second contact 423 and the third contact 424 are connected. The fan 17 of the fan 17 and the fan 32 of the air-cooled evaporator 3; and because the second contact 182 of the temperature switch 18 in the storehouse is connected, and there is a power supply that can conduct the high and low pressure switch 43, the overload protector 441, and make the compressor The electromagnetic switch coil 442 is excited to start the compressor 11 to cool, so that the refrigerant is compressed by the compressor 11 and becomes a high-temperature and high-pressure gaseous refrigerant, and then enters the condenser 12 through the first passage 10a to cool down into a high-pressure normal temperature liquid refrigerant. The liquid receiver 13, the input pipe 143 and the output pipe 144 of the heat exchanger 14, the second passage 10b, and the third passage 10c enter the second expansion valve 16b and expand to become a low-temperature and low-pressure liquid-gas refrigerant, and then pass through the eighth passage 10g, the air-cooled evaporator 3, the air-cooled evaporator 3 provides cold energy for heat exchange, and then passes through the fourth passage 10d, the fifth passage 10e, the input pipe 145 and the output pipe of the inner barrel 142 of the heat exchanger 14 146, return to the refrigerating compressor 11, that is, complete the refrigeration cycle process of the air-cooled evaporator 3 once; since the air-cooled evaporator 3 provides cold energy for heat exchange, the hot air entering the storage body and other The entrained water vapor and the moisture of the object to be frozen are absorbed by the air-cooled evaporator 3 and condensed into frost. Since the tube-cooled evaporator 2 does not provide cold energy for heat exchange, the tube-cooled evaporator 2 does not Will frost.

Please refer to Fig. 1 and shown in Fig. 6 again, when the door of freezing/preserving room was closed, the first contact 411 of microswitch 41 was disconnected, and the second contact 412 of microswitch 41 was connected and had power supply Able to start the delay relay 45 to start timing, assuming that the preset time is to automatically disconnect the contact 451 of the delay relay 45 after closing the door for five minutes, then the contact 451 of the delay relay 45 will automatically disconnect after five minutes. The evaporator 3 runs the refrigeration cycle process, and changes the tube-cooled evaporator 2 into the refrigeration cycle process; when the contact 451 of the delay relay 45 is not disconnected, the relay coil 421 is still connected for five minutes due to the opening of the warehouse door. The power supply makes the first contact 422, the second contact 423 and the third contact 424 of the open warehouse door relay still connected, and the fourth contact 425 is still disconnected; because the first contact 422, the second contact 423 and the third contact 424 Still connected to start the fan 17 of the condenser 12 and the fan 32 of the air-cooled evaporator 3, and make the second refrigeration solenoid valve 15b open the third passage 10c; because the fourth contact 425 is still disconnected, the first Freezing solenoid valve 15a is disconnected and closed; and, because the second contact 182 of temperature switch 18 in the storehouse is connected, there is a power supply that can conduct high and low pressure switch 43 and overload protector 441, and make the compressor electromagnetic switch coil 442 is excited to start the compressor 11 to cool, so that the refrigerant is compressed by the compressor 11 and becomes a high-temperature and high-pressure gaseous refrigerant, and then enters the condenser 12 through the first passage 10a to cool down into a high-pressure normal temperature liquid refrigerant, and then passes through the liquid receiver 13. The input pipe 143 and output pipe 144 of the heat exchanger 14, the second passage 10b, and the third passage 10c enter the second expansion valve 16b and expand to become a low-temperature and low-pressure liquid-gas refrigerant, and then pass through the eighth passage 10g, gas The cold evaporator 3 is provided with cold energy by the air-cooled evaporator 3 for heat exchange, and then through the fourth passage 10d, the fifth passage 10e, the input pipe 145 and the output pipe 146 of the inner barrel 142 of the heat exchanger 14, and then Back in the refrigeration compressor 11, the air-cooled evaporator 3 operation refrigeration cycle process is completed once; since the air-cooled evaporator 3 still provides cold energy for heat exchange within five minutes after closing the door, the hot air entering the storage body The water vapor carried by it and the moisture of the object to be frozen will be absorbed by the air-cooled evaporator 3 and condensed into frost. Since the tube-cooled evaporator 2 does not provide cold energy for heat exchange, the tube-cooled evaporator 2 Evaporator 2 will not frost.

Please refer to Figure 1 and Figure 7 again. When there are frozen objects that are not vacuum-packed and will release moisture in the freezer/storage room, the tube-cooled evaporator 2 and the air-cooled evaporator 3 can be used alternately according to actual needs. For example: the tube-cooled evaporator 2 stops after running for five hours, and the setting timer 46 automatically changes and stops after the air-cooled evaporator 3 runs for one hour, so it runs in turn. Assuming that the tube-cooled evaporator 2 has been running for five hours, at this time, the first contact 461 of the setting timer 46 is connected to start the fan 17 of the condenser 12 and the fan 32 of the air-cooled evaporator 3 and make the second refrigeration The solenoid valve 15b opens the third passage 10c; at the same time, the second contact point 462 is disconnected, the first refrigeration solenoid valve 15a is closed, and because the second contact point 182 of the temperature switch 18 in the storehouse is connected, there is a power source that can be activated. The pressure switch 43, the overload protector 441, and the electromagnetic switch coil 442 of the compressor are excited to start the compressor 11 for refrigeration, so that the refrigerant is compressed by the compressor 11 and becomes a high-temperature and high-pressure gaseous refrigerant, and then enters through the first passage 10a The condenser 12 cools down to a high-pressure normal-temperature liquid refrigerant, and then enters the second expansion valve 16b after expansion through the liquid receiver 13, the input pipe 143 and the output pipe 144 of the heat exchanger 14, the second passage 10b, and the third passage 10c. It becomes a low-temperature and low-pressure liquid-gas refrigerant, and then passes through the eighth passage 10g, the air-cooled evaporator 3, and the cold energy provided by the air-cooled evaporator 3 exchanges heat with the refrigerated food placed in the freezer/storage room, and then passes through the fourth The passage 10d, the fifth passage 10e, the input pipe 145 and the output pipe 146 of the inner barrel body 142 of the heat exchanger 14 are returned to the refrigeration compressor 11, and the refrigeration cycle process of the air-cooled evaporator 3 is completed once; The air-cooled evaporator 3 provides cold energy for heat exchange. Therefore, the hot air entering the storage body and the moisture carried by it and the moisture of the object to be frozen will still be absorbed by the air-cooled evaporator 3 and condense into frost , and since the tube-cooled evaporator 2 does not provide cold energy for heat exchange, the tube-cooled evaporator 2 will not frost.

Referring to Fig. 1 and Fig. 8 again, when the accumulative operating time of the air-cooled evaporator 3 reaches the time set by the defrosting timer 47, the defrosting operation is started, and the first contact 471 of the defrosting timer 47 is turned on, the second contact 472 of the defrosting timer 47 is turned off, so that the power supply follows the third contact 483 of the defrosting conversion contactor 48 that has been turned on, opens the defrosting solenoid valve 490 and opens the seventh passage 49 , the high-pressure and high-temperature gaseous refrigerant performs defrosting work through the first passage 10a, the first end 491 of the seventh passage 49, the second end 492 of the seventh passage 49, the eighth passage 10g, and the air-cooled evaporator 3, and the air-cooled The surface of the evaporator 3 is heated to melt the frost, and the water generated by the defrosting is collected in the water collection tray 34 and then discharged from the drain pipe 35 .

See also shown in Fig. 1 and Fig. 9 again, suppose the defrosting time set by the defrosting timer 47 is 15 minutes, so the defrosting timer 47 should just be disconnected in 15 minutes; But, sometimes due to freezing/ The amount of frosting in the storage room is not much and the defrosting is completed in 5 minutes. At this time, the defrosting timer 47 will not be disconnected immediately after the defrosting is completed, but will still be disconnected after 10 minutes and then connected. The second contact 482 is to recover the air-cooled evaporator 3 to provide cold energy for heat exchange. When the defrost reset temperature switch 40 detects that the defrosting work of the air-cooled evaporator 3 has been completed, the first contact 401 of the defrost reset temperature switch 40 is turned on, and the second contact 402 of the defrost reset temperature switch 40 is turned off. At the same time, the coil 480 of the defrosting conversion contactor can be excited due to the power supply, so that the third contact 483 and the fourth contact 484 of the defrosting conversion contactor are disconnected, and the first contact 481 and the second contact 482 are connected. , recovery air-cooled evaporator 3 provides cold energy for heat exchange. When the air-cooled evaporator 3 provides cold energy for heat exchange for a few minutes, the defrost reset temperature switch 40 disconnects the first contact 401 due to detection that the air-cooled evaporator 3 has recovered. At this time, due to the first contact 481 And the second contact 482 is still kept connected, and the air-cooled evaporator 3 still provides cold energy for heat exchange. When the defrosting timer 47 is disconnected after 15 minutes, as shown in Figure 7, the first contact 471 is disconnected, the second contact 472 is connected, and the defrosting conversion contactor coil 480 is not excited, so that the defrosting The third contact 483 of the conversion contactor and the fourth contact 484 of the defrosting conversion contactor are connected, the first contact 481 of the defrosting conversion contactor and the second contact 482 of the defrosting conversion contactor are disconnected, and the air-cooled evaporator 3 Provide cold energy for heat exchange.

As can be seen from the above description, when the door of the freezer/storage compartment is opened, the present invention makes the air-cooled evaporator replace the tube-cooled evaporator for freezing operation due to the action of the micro switch, therefore, the hot air and The water vapor carried by it and the moisture of the object to be frozen will be absorbed by the air-cooled evaporator and condensed into frost. The water vapor in the tube is used for heat exchange, so the tube-cooled evaporator will not frost; in addition, the tube-cooled evaporator can improve the freezing capacity and efficiency of the refrigerator because it will not frost and has a comprehensive and uniform cooling effect; Furthermore, since the frost in the air-cooled evaporator can be melted into water during defrosting, and concentrated in the water collection tray, it will be discharged from the drain pipe, so it will not cause the ground in the freezer/storage room to be wet, nor will it cause Ideal for refrigerated food being injured by falling frost.

Claims (7)

1. A structure of a freezer, characterized in that it includes a freezer and a defrosting device; the freezer includes a compressor with an output and an input, a compressor with an input and an output and a The condenser of the fan, the first passage connecting the output end of the compressor and the input end of the condenser, the liquid receiver having an input end and an output end, an input pipe communicating with the fifth passage, and a connection with the compressor The heat exchanger of the output pipe connected to the input end, a second passage, a first refrigeration solenoid valve fixed in the second passage, a first expansion valve fixed in the second passage and located downstream of the first refrigeration solenoid valve valve, a tube-cooled evaporator communicating with the downstream of the first expansion valve, a fifth passage communicating with the downstream of the tube-cooling evaporator, a third passage communicating with the second passage and located upstream of the first refrigeration solenoid valve passage, a second refrigeration solenoid valve fixed in the third passage, a second expansion valve fixed in the third passage and located downstream of the second refrigeration solenoid valve, an eighth valve connected with the downstream of the second expansion valve passage, an air-cooled evaporator communicating with the downstream of the eighth passage, a fourth passage communicating with the downstream of the air-cooled evaporator and the fifth passage, and a chamber temperature having a first junction and a second junction switch; wherein, the input end of the liquid reservoir is communicated with the output end of the condenser, and the output end of the liquid reservoir is communicated with the second passage; the defrosting device has a micro switch with a first contact and a second contact A switch, a warehouse door opening relay with a coil, a first contact, a second contact, a third contact and a fourth contact, a high and low pressure switch, an overload protector and a coil and electrically connected compressor electromagnetic switch, a delay relay with one contact, a setting timer with a first contact and a second contact, a defrosting timer with a first contact and a second contact, a A defrosting conversion contactor with a coil, a first contact, a second contact, a third contact, and a fourth contact, a seventh channel with a defrosting solenoid valve fixed, a fixed contact and a first contact A defrost reset temperature switch with one contact and one second contact; the micro switch is set at the entrance of the storage body, the first contact of the micro switch is connected with the first contact of the opening relay coil and the opening relay and the time delay The contact of the relay is electrically connected with the second contact of the opening relay; the second contact of the micro switch is electrically connected with the delay relay and the contact of the delay relay; the contact of the delay relay is connected with the first contact of the opening relay. The contacts are electrically connected; the second contact of the open warehouse door relay, the second refrigeration solenoid valve and the fan of the condenser, the third contact of the open warehouse door relay, the first contact of the setting timer, the defrosting timer and defrosting The solenoid valve is electrically connected to the coil of the defrosting changeover contactor; the third contact of the open warehouse door relay is connected to the first contact of the setting timer, the second contact of the setting timer and the fan of the air-cooled evaporator and the high and low pressure The switch is electrically connected to the temperature switch in the warehouse; the second contact of the setting timer is electrically connected to the fourth contact of the warehouse door opening relay, and the fourth contact of the warehouse door opening relay is electrically connected to the first refrigeration solenoid valve ;High and low pressure switch and library The contacts of the internal temperature switch and the open warehouse door relay are electrically connected with the coil of the compressor electromagnetic switch and the overload protector; the first contact of the defrost timer is connected with the first contact of the defrost reset temperature switch and the defrost conversion contactor The first contact is electrically connected to the third contact of the defrosting conversion contactor; the second contact of the defrosting timer is electrically connected to the fourth contact of the defrosting conversion contactor; the first contact of the defrosting conversion contactor is electrically connected to the defrosting conversion contactor. The fixed contact of the frost reset temperature switch is electrically connected with the first contact of the defrost reset temperature switch and the third contact of the defrost conversion contactor; the second contact of the defrost conversion contactor is connected with the second freezing solenoid valve and the condenser The fan and the fan of the air-cooled evaporator are electrically connected to the fourth contact of the defrosting conversion contactor; the third contact of the defrosting conversion contactor is electrically connected to the defrosting solenoid valve; the coil of the defrosting conversion contactor is connected to the defrosting contactor The fixed contact of the reset temperature switch is electrically connected to the first contact of the defrosting conversion contactor; the first end of the seventh path communicates with the first path between the refrigeration compressor and the condenser; the first end of the seventh path The two ends communicate with the eighth passage between the second expansion valve and the air-cooled evaporator. 2. The structure of the refrigerating machine according to claim 1, characterized in that the electromagnetic switch coil of the compressor and the micro switch, the relay coil for opening the warehouse door, the high and low pressure switch, the delay relay, the setting timer, the defrosting There is a manual selection switch between the timer, the defrosting conversion contactor, the defrosting solenoid valve and the temperature switch in the storage. 3. The structure of the freezer according to claim 2, wherein the heat exchanger comprises an outer barrel of an airtight container and an inner barrel of an airtight container fixed on the upper end surface of the outer barrel; the outer barrel There is an input pipe connected with the output end of the liquid reservoir and an output pipe communicated with the expansion valve; the inner barrel has an input pipe communicated with the fifth passage and an output pipe communicated with the input end of the compressor. 4. The structure of the refrigerator according to claim 3, wherein the tube-cooled evaporator is composed of a tube, several radial fins integrally formed on the outer wall of the tube, and a tube or fin The sheets are combined and fixed on the top surface of the freezer. 5. The structure of the refrigerator according to claim 3, wherein the air-cooled evaporator includes a box body fixed on the top surface of the freezer, a plurality of fans fixed on the box body, A copper pipe row fixed in the box body and a water collection tray fixed at the bottom of the box body with a drain pipe. 6. The structure of the refrigerator according to claim 4, characterized in that, the tube-cooled evaporator is additionally provided with a sixth passage communicating with the first refrigeration solenoid valve and the first expansion valve in the second passage, and a sixth passage located at The third expansion valve downstream of the sixth passage communicates with a first tube-cooled evaporator located downstream of the third expansion valve; the first tube-cooled evaporator is composed of a pipe and several integrally formed Radial fins formed on the outer wall and a fixing frame fixed on the top surface of the freezer for the pipe fittings or fins of the first tube-cooled evaporator to be combined; the pipe fittings of the first tube-cooled evaporator One end communicates with the downstream of the third expansion valve, and the other end of the tube of the first tube-cooled evaporator communicates with the fifth passage. 7. The structure of the refrigerator according to claim 5, characterized in that, the tube-cooled evaporator is additionally provided with a sixth passage communicating with the first refrigeration solenoid valve and the first expansion valve in the second passage, and a sixth passage located at The third expansion valve downstream of the sixth passage communicates with a first tube-cooled evaporator located downstream of the third expansion valve; the first tube-cooled evaporator is composed of a pipe and several integrally formed Radial fins formed on the outer wall and a fixing frame fixed on the top surface of the freezer for the pipe fittings or fins of the first tube-cooled evaporator to be combined; the pipe fittings of the first tube-cooled evaporator One end communicates with the downstream of the third expansion valve, and the other end of the tube of the first tube-cooled evaporator communicates with the fifth passage.