CN110195955A - Freezer with automatic defrosting system - Google Patents

Abstract

The invention provides a cold storage with an automatic defrosting function, which belongs to the technical field of freezing devices. It includes a cold storage body, a refrigeration coil and a defrosting control system. The defrosting control system includes: an electric heating coil, which is set close to the refrigeration coil; a photoelectric sensor, which includes a light generator and a light receiver. The light generator and the light receiver are arranged on both sides of the cold storage body opposite to each other, and a frosting space is formed between the plane where the light generator and the light receiver are located and the refrigeration coil; the sound and light alarm device is electrically connected to the photoelectric sensor , when the light receiver fails to receive the light signal from the light generator, the sound and light alarm device will send out a defrost alarm. The thickness of the frost layer on the refrigeration coil is detected and judged by the photoelectric sensor, and the principle of straight-line propagation of light in the photoelectric switch is used to detect the thickness of the frost layer. Compared with the traditional temperature or humidity detection, it is less affected by the operation of the cold storage itself and environmental changes. The judgment is more direct and accurate.

Description

Cold storage with automatic defrost function

technical field

The invention belongs to the technical field of freezing devices, and in particular relates to a cold storage with an automatic defrosting function.

Background technique

As a device for low-temperature preservation of fresh food, cold storage is widely used in cold chain logistics. With the extension of continuous use time, a thick frost layer will inevitably form around the refrigeration coil of the cold storage, which will seriously affect the refrigeration efficiency and increase energy consumption.

In the prior art, the defrosting technology of cold storage includes natural defrosting and heating defrosting, but no matter which defrosting method needs to rely on people to judge the timing of defrosting, or randomly select the appropriate timing to defrost the cold storage, It is impossible to accurately judge the timing of defrosting. If the frost layer is not removed for a long time, it will affect the cooling efficiency, waste electricity, and may even cause the deterioration of the refrigerated items. If the defrosting interval is short, the efficiency of the cold storage will be reduced. At the same time, repeated Start and stop, the key equipment of the cold storage is easy to be damaged, and the service life of the equipment is shortened.

Contents of the invention

In view of this, the present invention provides a cold storage with an automatic defrosting function capable of accurately judging the defrosting timing of the cold storage and having high defrosting efficiency.

The technical solution adopted by the present invention to solve its technical problems is:

A cold storage with an automatic defrosting function, including a cold storage body and a refrigeration coil arranged in the cold storage body, and also includes a defrosting control system, and the defrosting control system includes:

An electric heating coil, the electric heating coil is arranged close to the refrigeration coil, an electric heating wire is provided in the electric heating coil, and an electric heating switch is connected in series with the electric heating coil;

A photoelectric sensor, the photoelectric sensor includes a light generator and a light receiver, the light generator and the light receiver are arranged on both sides of the cold storage body opposite to each other, and the light generator and the light receiver A frosting space is formed between the plane where it is located and the refrigeration coil;

An audible and visual alarm device, the audible and visual alarm device is electrically connected to the photoelectric sensor, and when the light receiver fails to receive the light signal from the light generator, the audible and visual alarm device sends out a defrosting alarm.

Preferably, the cold storage with automatic defrosting function further includes a programmable controller, the input end of the programmable controller is electrically connected to the photoelectric sensor, and the output end is electrically connected to the electrothermal switch.

Preferably, a first detection chute and a second detection chute are oppositely arranged on both sides of the cold storage body; a first driving member is provided on the light generator, and the first driving member is slidably connected to the first detection chute. A detection chute; a second drive member is provided on the light receiver, and the second drive member is slidably connected to the second detection chute; the first drive member and the second drive member are displaced synchronously.

Preferably, the first detection chute and the second detection chute are hollow annular grooves, the first detection chute is provided with strip-shaped light emitting holes along the length direction, and the second detection chute Strip-shaped light-receiving holes are opened along the length direction on the detection chute, and the light-receiving holes and the light-emitting holes are located on the same horizontal plane.

Preferably, the first detection chute and the second detection chute are provided with heating elements on the tank bodies, and an insulation layer is provided on the outer tank wall.

Preferably, the electric heating coil is provided with a flow guide protrusion, and both sides of the flow guide protrusion have smooth arc surfaces.

Preferably, a defrosting water collection assembly is also included, and the defrosting water collection assembly is arranged below the refrigeration coil; the defrosting water collection assembly includes a number of diversion grooves and two ends of the defrosting groove The outlet main pipe, the diversion groove is arranged under the refrigeration coil, the groove bottom of the flow diversion groove has a slope angle gradually decreasing from the middle to both ends, and the outlet main pipe is inclined to one end.

Preferably, the defrosting water collection assembly also includes a frost water receiving part, and the frost water receiving part is arranged above the diversion groove; the frost water receiving part includes a defrosting part and is arranged on the defrosting part The diversion chamber at the lower end of the defrosting part, the upper end of the defrosting part has a bell mouth extending outward, and the lower end shrinks inward, the upper end of the defrosting chamber communicates with the defrosting part, and the lower end communicates with the diversion groove .

Preferably, the inner cavity of the defrosting part is provided with a buffer filter made of flexible material, and the mesh number of the buffer filter is 4-10 mesh.

It can be seen from the above technical solution that the present invention provides a cold storage with an automatic defrosting function, and its beneficial effects are: the defrosting control system is installed in the cold storage body, and the photoelectric sensor is used to detect and judge the temperature of the refrigeration tray. The thickness of the frost layer on the tube. When the light receiver cannot receive the signal from the light generator, the sound and light alarm device will send out a sound and light alarm to prompt the operator to turn on the electric heat switch. The above-mentioned electric heating coil is heated for defrosting operation. The defrosting control system provides a detection method that utilizes photoelectric switch detection to determine the thickness of the frost layer. On the one hand, the information on the thickness of the frost layer in the cold storage is quickly obtained and an alarm is issued; Compared with the traditional temperature or humidity detection, the detection of the thickness of the frost layer is less affected by the operation of the cold storage itself and environmental changes, and the judgment is more direct and accurate.

Description of drawings

Figure 1 is a schematic diagram of the circuit connection of the defrosting control system.

Figure 2 is a schematic diagram of the logic connection of the defrosting control system.

Fig. 3 is a structural schematic diagram of a cold storage with an automatic defrosting function.

Fig. 4 is a schematic cross-sectional view along the line A-A shown in Fig. 3 .

Fig. 5 is a partially enlarged view of part A shown in Fig. 4 .

Fig. 6 is a partially enlarged view of part B shown in Fig. 4 .

Fig. 7 is a schematic cross-sectional view along B-B direction shown in Fig. 3 .

Fig. 8 is a schematic diagram of the internal structure of the cold storage with automatic defrosting function.

Fig. 9 is a schematic diagram of the internal structure of the cold storage with automatic defrosting function.

In the figure: cold storage 10 with automatic defrosting function, cold storage body 100, first detection chute 110, light emitting hole 111, second detection chute 120, light receiving hole 121, refrigeration coil 200, defrosting control system 300 , electric heating coil 310, electric heating switch 311, guide protrusion 312, electric heating wire 313, photoelectric sensor 320, light generator 321, first driving part 3211, light receiver 322, second driving part 3221, sound and light alarm 330 , programmable controller 340 , defrost water collecting assembly 400 , diversion tank 410 , outlet main pipe 420 , frost water receiving part 430 , defrost part 431 , diversion chamber 432 , buffer filter 4311 .

Detailed ways

The technical solutions and technical effects of the present invention will be further described in detail below in conjunction with the accompanying drawings of the present invention.

Please refer to Fig. 1 to Fig. 4, in a specific embodiment, a cold storage 10 with automatic defrosting function includes a cold storage body 100 and a refrigeration coil 200 arranged in the cold storage body 100, and also includes a defrosting control system 300.

The defrosting control system 300 includes an electric heating coil 310, a photoelectric sensor 320, and an audible and visual alarm device 330. The electric heating coil 310 is arranged close to the refrigeration coil 200, and the electric heating coil 310 has an electric heating wire 313 inside. The heating wire 313 is connected with a heating switch 311 in series. The heating wire 313 is connected to an external power source, and the heating switch 311 is turned on. The heating wire 313 generates heat, which is conducted through the heating coil 310 to melt the frost layer on the cooling coil 200 .

Please refer to FIG. 8 and FIG. 9 together, the photoelectric sensor 320 includes a light generator 321 and a light receiver 322, and the light generator 321 and the light receiver 322 are arranged on both sides of the cold storage body 100 opposite , and a frosting space is formed between the plane where the light generator 321 and the light receiver 322 are located and the refrigeration coil 200 . The sound and light alarm device 330 is electrically connected to the photoelectric sensor 320 , and when the light receiver 322 fails to receive the light signal from the light generator 321 , the sound and light alarm device 330 sends out a defrosting alarm.

In the normal state or the state where the frost layer is relatively thin, the light receiver 322 can stably receive the light signal sent by the light generator 321, when the thickness of the frost layer is greater than or equal to the thickness of the frosting space At this time, the light signal sent by the light generator 321 is blocked by the frost layer, and the light receiver 322 cannot receive the light signal sent by the light generator 321. At this time, the light signal of the sound and light alarm device 330 When the circuit is turned on, the audible and visual alarm device 330 sends out an audible and visual alarm to warn the operator, and the defrosting operation is performed by turning on the electrothermal switch 311 .

In this embodiment, the photoelectric sensor 320 is used to judge the thickness of the frost layer on the refrigeration coil 200, and the thickness of the frost layer can be accurately judged through the principle of linear propagation of light, so as to provide scientific guidance for operators to perform defrosting operations. Avoid the frost layer not being cleared for a long time, resulting in a decrease in cooling efficiency and an increase in energy consumption, or the defrosting interval is too short, resulting in equipment loss. At the same time, the process of judging the thickness of the frost layer by the photoelectric sensor 320 is not affected by the operating factors of the cold storage itself or the changes of external environmental factors. Compared with the monitoring and judging methods of temperature or humidity, it has the advantages of high judgment accuracy and strong stability.

Further, the defrosting control system 300 further includes a programmable controller 340 , an input end of the programmable controller 340 is electrically connected to the photoelectric sensor 320 , and an output end is electrically connected to the electrothermal switch 311 . The programmable controller 340 is preset with a control program, and the control program is a commonly used judgment program. When the light receiver 322 of the photoelectric sensor 320 cannot receive the light signal sent by the light generator 321, the programmable controller 340 receives the information and outputs control information to control the electrothermal switch 311 Closing, so that the electric heating wire 313 conducts and generates heat, and conducts through the electric heating coil 310 , so that the frost layer on the refrigeration coil 200 is heated and melted.

Please refer to FIGS. 3 to 7 together. Further, in order to improve the accuracy and stability of the detection of the thickness of the frost layer by the photoelectric sensor 320, and avoid the incomplete detection of the photoelectric sensor 320 due to the local thickening of the frost layer, A first detection chute 110 and a second detection chute 120 are oppositely disposed on two sides of the cold storage body 100 . The light generator 321 is provided with a first driving member 3211 , and the first driving member 3211 is slidably connected to the first detection sliding slot 110 . The light receiver 322 is provided with a second driving member 3221 , and the second driving member 3221 is slidably connected to the second detection sliding slot 120 . The first driving member 3211 and the second driving member 3221 are displaced synchronously.

Start the first driving member 3211 and the second driving member 3221, the first driving member 3211 and the second driving member 3221 are horizontally displaced synchronously, and then drive the load on the first driving member 3211 and the The light generator 321 on the second driving member 3221 is displaced synchronously with the light receiver 322, when in the horizontal direction, the light receiver 322 cannot receive the light signal sent by the light generator 321 for a predetermined time , it is determined that the thickness of the frost layer on the refrigeration coil 200 reaches a preset value. In this way, the linear detection of the thickness of the frost layer is realized. Only when the thickness of the frost layer in all linear areas within the detection range reaches a predetermined value, the sound and light alarm device 330 is triggered or the electrothermal switch 311 is triggered, prompting Operator or automatic defrost operation.

Further, the first detection chute 110 and the second detection chute 120 are hollow annular grooves, and the first detection chute 110 is provided with strip-shaped light emitting holes 111 along the length direction, The second detection chute 120 is provided with a strip-shaped light receiving hole 121 along the length direction, and the light receiving hole 121 is located on the same level as the light emitting hole 111 . The light signal sent by the light generator 321 is received by the light receiver 322 through the light emitting hole 111 and the light receiving hole 121, so as to further improve the optical signal of the light generator 321 and the light receiver 322. The stability of the installation, while providing a shelter for the light generator 321 and the light receiver 322, to prevent the long-term low temperature during the operation of the cold storage, causing the photoelectric sensor 320 to fail to operate normally, or due to frost, causing The first driving member 3211 and the second driving member 3221 are jammed, resulting in wrong detection results.

Furthermore, the first detection chute 110 and the second detection chute 120 are provided with heat tracing elements on the tank bodies, and an insulation layer is provided on the outer tank wall. To continuously heat the first detection chute 110 and the second detection chute 120 through the heating element, so that all the components in the first detection chute 110 and the second detection chute 120 The light generator 321 and the light receiver 322 can operate within a preferred operating temperature range. The thermal insulation layer isolates the heat exchange between the first detection chute 110 and the second detection chute 120 , reduces the heat output of the heating element, and reduces the cooling energy consumption.

In yet another preferred embodiment, the electric heating coil 310 is provided with a flow guide protrusion 312, and both sides of the flow guide protrusion 312 have smooth arc surfaces. During the defrosting process, the electric heating coil 310 generates heat, and the frost layer melts slowly. It flows down and can be collected to prevent the defrosting water from dripping irregularly, causing the ground in the cold storage body 100 to be polluted by a large amount of defrosting water, which requires further cleaning and increases the workload.

Further, in order to collect and centrally process the defrosting water of the cold storage, the cold storage with automatic defrosting function 10 also includes a defrosting water collection assembly 400, and the defrosting water collection assembly 400 is arranged under the refrigeration coil 200 . The defrosting water collection assembly 400 includes a plurality of diversion grooves 410 and outlet headers 420 arranged at both ends of the diversion grooves 410, the diversion grooves 410 are arranged below the refrigeration coil 200, and the diversion grooves The groove bottom of 410 has a slope angle gradually decreasing from the middle to both ends, and the outlet main pipe 420 is inclined to one end.

During the defrosting operation, the frost layer is continuously melted under the heat of the electric heating coil 310, and the defrosting water collects along the lower tube wall of the electric heating coil 310 or the refrigeration coil 200, and flows into the The diversion groove 410 , under the action of the diversion groove, divides the flow to both sides, and enters the outlet main pipe 420 , and is exported from the outer side of the cold storage body 100 by the outlet main pipe 420 . The slope angle of the groove bottom of the diversion groove 410 is 5°-30°, which ensures that the defrosting water can flow smoothly into the outlet main pipe 420 on the one hand, and helps to save installation space on the other hand. At the same time, the diversion groove 410 arranged obliquely to both sides is in a triangular shape, which is beneficial to the installation stability of the diversion groove.

Preferably, the defrosting water collection assembly 400 further includes a frost water receiving part 430 , and the frost water receiving part 430 is disposed above the flow guide groove 410 . The frost water receiving part 430 includes a defrosting part 431 and a flow guide chamber 432 arranged at the lower end of the defrosting part 431. The upper end of the defrosting part 431 has a bell mouth extending outward, and the lower end shrinks inward. , the upper end of the guide cavity 432 communicates with the defrosting portion 431 , and the lower end communicates with the guide groove 410 .

During the defrosting process, it is inevitable that the incompletely melted frost layer will fall off from the refrigeration coil 100, and the fallen solid frost layer will first fall into the top of the defrosting part 431, and be buffered by the defrosting part 431. , and after further ablation, enter the guide cavity 432 , and be guided through the guide cavity 432 to enter the guide groove 410 . Prevent the falling solid frost layer from impacting the flow guide groove 410 , causing damage to the flow guide groove 410 or splashing the defrosted water in the flow guide groove. Further, the inner cavity of the defrosting part 431 is provided with a buffer filter 4311 made of flexible material, and the mesh of the buffer filter 4311 is 4-10 mesh. The shedding solid frost layer first falls on the buffer filter 4311, and the elastic buffer filter 4311 provides a buffer force to prevent the shedding solid frost from being in hard contact with the defrosting portion 431 or the flow guide groove 410 .

What is disclosed above is only a preferred embodiment of the present invention, and certainly cannot limit the scope of rights of the present invention with this. Those of ordinary skill in the art can understand the whole or part of the process of realizing the above-mentioned embodiment, and make according to the claims of the present invention The equivalent changes still belong to the scope covered by the invention.

Claims (9)

1. a kind of freezer with automatic defrosting system, including freezer ontology and it is set to the intrinsic chill plate of the freezer Pipe, which is characterized in that further include defrosting control system, the defrosting control system includes:

Electric heating coil, the electric heating coil are arranged close to the refrigeration coil, have heating wire, the electricity in the electric heating coil Heated filament is in series with heater switch；

Photoelectric sensor, the photoelectric sensor include optical generator and optical receiver, the optical generator and the light-receiving Device is relatively arranged on the two sides of the freezer ontology, and plane and the system where the optical generator and the optical receiver Frosting space is formed between cooling coil；

Sound-light alarm instrument, the sound-light alarm instrument is electrically connected the photoelectric sensor, when the optical receiver does not receive institute When stating the optical signal of optical generator sending, the sound-light alarm instrument issues defrosting alarm.

2. as described in claim 1 with the freezer of automatic defrosting system, which is characterized in that further include a PLC technology Device, the input terminal of the programmable controller is electrically connected the photoelectric sensor, and output end is electrically connected the electric heating and opens It closes.

3. as described in claim 1 with the freezer of automatic defrosting system, which is characterized in that the two sides phase of the freezer ontology To be provided with the first detection sliding slot and second detection sliding slot；

It is provided with the first actuator on the optical generator, first actuator is slidably connected the first detection sliding slot；

It is provided with the second actuator on the optical receiver, second actuator is slidably connected the second detection sliding slot；

First actuator and the second actuator synchronous shift.

4. as claimed in claim 3 with the freezer of automatic defrosting system, which is characterized in that the first detection sliding slot and institute Stating the second detection sliding slot is hollow cyclic annular groove body, offers the light emitting of bar shaped on the first detection sliding slot along its length Hole, described second detects the light admitting aperture for offering bar shaped on sliding slot along its length, the light admitting aperture and the light emitting Hole is located in same level.

5. as claimed in claim 4 with the freezer of automatic defrosting system, which is characterized in that the first detection sliding slot and institute It states and is provided with heat tracing part on the groove body of the second detection sliding slot, and be provided with insulating layer on external groove sidevall.

6. as described in claim 1 with the freezer of automatic defrosting system, which is characterized in that be provided on the electric heating coil The two sides of water conservancy diversion protrusion, the water conservancy diversion protrusion have smooth cambered surface.

7. the freezer with automatic defrosting system as described in any one of claim 1~6, which is characterized in that further include There is defrosting water collection assembly, the defrosting water collection assembly is set to below the refrigeration coil；

The defrosting water collection assembly includes several diversion trenches and the export general pipeline for being set to the diversion trench both ends, the water conservancy diversion Slot is set to below the refrigeration coil, and the slot bottom of the diversion trench has the slope angle gradually decreased from centre to both ends, described Export general pipeline is obliquely installed to one end.

8. as claimed in claim 7 with the freezer of automatic defrosting system, which is characterized in that the defrosting water collection assembly is also Including white water supporting, the frost water supporting is set to the top of the diversion trench；

The frost water supporting includes defrosting portion and the diversion cavity for being set to defrosting subordinate end, the upper end tool in defrosting portion There is the horn mouth extended outward, and undergauge, the upper end of the diversion cavity are connected to the defrosting portion, and lower end company inwardly for lower end Lead to the diversion trench.

9. as claimed in claim 8 with the freezer of automatic defrosting system, which is characterized in that the inner cavity in the defrosting portion is arranged Have using strainer is buffered made of flexible material, the mesh number of the buffering strainer is 4~10 mesh.