Defrosting and heating device of automatic cold chain equipment

Abstract

The utility model relates to the technical field of refrigeration and defrosting, in particular to a defrosting and heating device for automatic cold chain equipment, which comprises a first refrigerating unit and a second refrigerating unit which are identical in structure, run in parallel through a circuit and alternately refrigerate or defrost. The drainage unit is used for guiding out water liquid generated in the defrosting process of the fan through a drainage pipeline, and a drainage inlet, connected with the refrigerating unit, in the drainage pipeline of the drainage unit is higher than a drainage outlet, formed in the outer side of the refrigeration house, of the drainage pipeline; the electric heating unit comprises a first electric heating assembly connected with the first refrigerating unit and a second electric heating assembly connected with the second refrigerating unit. By arranging the two refrigerating units which are standby for each other, interruption of refrigeration of the refrigeration house is avoided, the defrosting capacity of the equipment is improved through electric heating, the temperature of the warehouse is kept, the safety performance of the refrigeration house equipment can be effectively improved, and the refrigeration keeping quality of the refrigeration house is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration defrosting technical field especially, relate to a kind of automatic cold chain equipment defrosting heating device. BACKGROUND

[0002] In the refrigeration process of refrigeration house, frost or ice layer is formed due to water condensation in the air caused by refrigeration. Therefore, the refrigerant needs to be defrosted regularly. During the defrosting process, the refrigeration function stops, which leads to the interruption of refrigeration in the refrigeration house, thereby causing the temperature change in the refrigeration house and affecting the storage quality of the stored goods in the refrigeration house.

[0003] Chinese patent publication No. CN112524868B discloses a refrigeration house system defrosting structure, which relates to the technical field of refrigeration house. It comprises a refrigeration house chamber and a circulating compressor, a condenser, a throttling device and an evaporator connected in turn. The evaporator is located indoors, and the condenser is located outdoors. The compressor has an outlet and an inlet, both of which are connected to the same four-way valve. The four-way valve is located outside the refrigeration house chamber. The condenser and the evaporator are connected to the compressor through the four-way valve. The four-way valve has two states, state one and state two. In state one, the outlet of the compressor is directly connected to the condenser, and the inlet of the compressor is directly connected to the evaporator. In state two, the outlet of the compressor is directly connected to the evaporator, and the inlet of the compressor is directly connected to the condenser. By setting the four-way valve, the refrigeration house system can adjust itself to defrost in time. However, in the above technical solution, the refrigeration unit operates as a single group. When there is a problem with refrigeration, it cannot function properly, which may lead to poor refrigeration stability of the refrigeration house. SUMMARY

[0004] Therefore, the utility model provides an automatic cold chain equipment defrosting heating device to overcome the problem of uneven temperature in the refrigeration house caused by the defrosting of the refrigeration machine in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides an automatic cold chain equipment defrosting heating device, which comprises:

[0006] The first and second refrigeration units have the same structure and are connected in parallel through an electric circuit. Each unit is provided with a direct expansion type refrigeration fan and a compressor to refrigerate and defrost the refrigeration house. The first and second refrigeration units alternate between refrigeration and defrosting.

[0007] A drainage unit is connected to the first and second refrigeration units to drain the water produced during the defrosting process of the fan through a drainage pipeline. The height of the drainage inlet connected to the refrigeration unit in the drainage pipeline of the drainage unit is higher than that of the drainage outlet of the drainage pipeline arranged on the outside of the refrigeration house.

[0008] An electric heating unit connected to the first and second refrigeration units respectively for heating the fan and the drainage pipeline to defrost, including a first electric heating assembly connected to the first refrigeration unit and a second electric heating assembly connected to the second refrigeration unit;

[0009] The first electric heating assembly is arranged on the drainage pipeline of the drainage unit connected to the first refrigeration unit, and the second electric heating assembly is arranged on the drainage pipeline of the drainage unit connected to the second refrigeration unit, for melting the ice on the drainage pipeline by electric heating.

[0010] Further, it further comprises:

[0011] A refrigeration control cabinet connected to the first and second refrigeration units and the electric heating unit through an electric circuit, for controlling the working state of the refrigeration units and the heating state of the electric heating unit.

[0012] Further, the refrigeration control cabinet comprises:

[0013] A first relay and a second relay, wherein the first relay is connected in series with the electric circuit of the first refrigeration unit, the second relay is connected in series with the electric circuit of the second refrigeration unit, and the first relay is connected in parallel with the second relay, for controlling the on-off of the electric circuits of the two refrigeration units respectively, and the on-off of the first and second relays is controlled by the corresponding control end of the refrigeration control cabinet.

[0014] A plurality of first temperature detectors arranged on the drainage pipelines of the two refrigeration units, for detecting the temperature of the inner wall of the drainage pipeline.

[0015] Further, the refrigeration control cabinet further comprises:

[0016] A plurality of laser sensors arranged on one side of the drainage pipeline close to the drainage inlet, for obtaining the thickness of the ice / snow in the drainage pipeline.

[0017] Further, it further comprises:

[0018] A plurality of second temperature detectors arranged uniformly inside the refrigeration chamber, for obtaining the temperature data inside the refrigeration chamber.

[0019] Further, it further comprises:

[0020] A plurality of refrigeration unit refrigeration temperature detectors arranged respectively at the refrigeration air outlets of the first and second refrigeration units, for detecting the refrigeration capacity of the refrigeration units.

[0021] An alarm is connected with each temperature detector and laser sensor respectively, and is used for acousto-optic alarm for the refrigeration unit with non-conforming refrigeration capacity or the refrigeration unit with frost thickness exceeding the set range.

[0022] Further, it further comprises:

[0023] A wireless alarm transceiver is connected with the alarm, and is used for transmitting alarm information to the corresponding alarm receiving end according to the alarm information.

[0024] Further, the refrigeration pipelines of the two refrigeration units are connected by copper pipes, the drainage pipelines of the drainage units are connected by PVC pipes, and the outside of the drainage pipelines is provided with an electric auxiliary heating circuit to heat and deice / de-frost the drainage pipelines.

[0025] Further, the cold storage control cabinet further comprises:

[0026] A control display screen is used for displaying the temperature data detected by each temperature detector and the alarm information of the alarm;

[0027] An input device is connected with the control display screen, and is used for obtaining the input control information of the first refrigeration unit and the second refrigeration unit.

[0028] Further, the electric heating unit is further connected with a timer, and the timer is used for obtaining the working time length of the electric heating unit.

[0029] Compared with the prior art, the automatic cold chain equipment de-frosting and heating device of the utility model has the advantages that the automatic cold chain equipment de-frosting and heating device of the utility model is provided with two groups of refrigeration units which are used as backup for each other, can de-frost one group of refrigeration units while the other group of refrigeration units is used to maintain the cold storage refrigeration temperature, avoids the interruption of cold storage refrigeration, improves the de-frosting capacity of the equipment through electric heating, maintains the warehouse temperature, effectively improves the safety performance of the cold storage equipment, and improves the cold storage refrigeration maintenance quality.

[0030] Further, the automatic cold chain equipment de-frosting and heating device of the utility model switches the refrigeration state and the de-frosting state of the two refrigeration units through the cold storage control cabinet, detects the thickness of ice and frost through the temperature detector and the laser sensor, effectively obtains the frost condition of the cold chain equipment, de-frosts the corresponding refrigeration unit, and improves the de-frosting efficiency and effectiveness.

[0031] Further, the automatic cold chain equipment de-frosting and heating device of the utility model alarms through the wireless alarm for the refrigeration unit with non-conforming refrigeration capacity or the refrigeration unit with frost thickness exceeding the set range, effectively monitors the working state of the refrigeration unit, de-frosts or repairs in time, and effectively prolongs the service life of the refrigeration unit. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The structure diagram of the defrosting and heating device of the automatic cold chain equipment is shown in the figure.

[0033] Figure 2 The structure diagram of the defrosting and heating device of the automatic cold chain equipment is shown in the figure.

[0034] In the figure: 1, first refrigeration unit; 2, second refrigeration unit; 3, drainage unit; 31, drainage inlet; 32, drainage outlet; 41, first electric heating assembly; 42, second electric heating assembly; 5, cold storage control cabinet; 51, first relay; 52, second relay; 53, first temperature detector; 54, laser sensor; 55, second temperature detector; 56, control display screen; 57, input device; 6, refrigeration temperature detector; 7, alarm; 8, wireless alarm transceiver. DETAILED DESCRIPTION

[0035] In order to make the purpose and advantages of the utility model more clear and obvious, the utility model is further described below in combination with examples; it should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0036] The preferred embodiments of the utility model are described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not used to limit the protection scope of the utility model.

[0037] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and are not indicative or suggestive of the device or element having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0038] In addition, it should also be noted that in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] Please refer to Figure 1 The structure diagram of the defrosting and heating device of the automatic cold chain equipment is shown in the figure, and the embodiment provides a defrosting and heating device for automatic cold chain equipment, which comprises:

[0040] a first refrigeration unit 1 and a second refrigeration unit 2, wherein the two refrigeration units are identical in structure and run in parallel through an electric circuit, and each of the two refrigeration units is provided with a direct expansion refrigeration fan and a compressor to refrigerate and defrost the cold storage, and the first refrigeration unit 1 and the second refrigeration unit 2 alternately refrigerate or defrost;

[0041] a drainage unit 3 connected to the first refrigeration unit 1 and the second refrigeration unit 2 respectively to guide the water generated in the fan defrosting process through a drainage pipeline, and the height of a drainage inlet 31 of the drainage pipeline of the drainage unit 3 connected to the refrigeration unit is higher than that of a drainage outlet 32 of the drainage pipeline arranged outside the cold storage;

[0042] an electric heating unit connected to the first refrigeration unit 1 and the second refrigeration unit 2 respectively to heat and defrost the fan and the drainage pipeline, including a first electric heating assembly 41 connected to the first refrigeration unit and a second electric heating assembly 42 connected to the second refrigeration unit;

[0043] wherein the first electric heating assembly 41 is arranged on the drainage pipeline of the drainage unit connected to the first refrigeration unit 1, and the second electric heating assembly 42 is arranged on the drainage pipeline of the drainage unit connected to the second refrigeration unit 2 to melt the ice on the drainage pipeline through electric heating.

[0044] In implementation, the first refrigeration unit and the second refrigeration unit are standby for each other, so that when one set of refrigeration units is refrigerating the cold storage, the other set of refrigeration units is defrosting and maintaining, and the two sets of refrigeration units alternately refrigerate and defrost, which can not only stabilize the refrigeration temperature in the cold storage within a certain temperature range, but also enable the defrosting of the refrigeration units to be carried out in time, avoiding equipment failure caused by icing of the drainage pipeline, and resulting in failure of the cold storage to work normally.

[0045] Specifically, it further comprises:

[0046] a cold storage control cabinet 5 connected to the first refrigeration unit 1, the second refrigeration unit 2 and the electric heating unit 3 through an electric circuit respectively to control the working state of the refrigeration units and the heating state of the electric heating unit 4.

[0047] In implementation, the cold storage control cabinet can automatically set or manually switch the working state (refrigeration state or defrosting state) of the two refrigeration units, and control the working or suspension of the heating function of the electric heating unit by turning on or off.

[0048] Specifically, the cold storage control cabinet 5 comprises:

[0049] a first relay 51 and a second relay 52, wherein the first relay 51 is connected in series with the circuit of the first refrigeration unit 1, the second relay 52 is connected in series with the circuit of the second refrigeration unit 2, and the first relay 51 is connected in parallel with the second relay 52, for controlling the on-off of the circuits of the two refrigeration units respectively, and the on-off of the first relay 51 and the second relay 52 is controlled by the corresponding control end of the freezer control cabinet.

[0050] a plurality of first temperature detectors 53, which are respectively arranged on the drain pipelines of the two refrigeration units, for detecting the temperature of the inner wall of the drain pipeline.

[0051] In the implementation, the working state switching of the first refrigeration unit is controlled by the first relay, the working state switching of the second refrigeration unit is controlled by the second relay, and the two sets of control circuits are connected in parallel into the power supply circuit, so that the working states of the two sets of refrigeration units can be controlled individually without affecting the other refrigeration unit, thereby the working of the other refrigeration unit is not affected when one set of refrigeration unit is defrosting, so that the temperature of the freezer is not affected, and the normal operation of the freezer is ensured.

[0052] Specifically, the freezer control cabinet 5 further comprises:

[0053] a plurality of laser sensors 54, which are arranged on one side of the drain pipeline close to the drain inlet, for acquiring the thickness of ice / frost on the inner wall of the drain pipeline.

[0054] In the implementation, the freezer refrigeration adopts direct expansion refrigeration, the refrigeration pipeline is connected to the cold air fan of the freezer, and the copper pipe connection technology is adopted, and after passing the pressure test, it is put into use. The drain pipeline uses a PVC material pipeline, which is internally provided with auxiliary heating wires, and the outer side of the pipeline is subjected to heat preservation treatment to improve the reliability. Moreover, the laser sensor capable of acquiring the thickness of ice / frost on the inner wall of the drain pipeline is arranged on one side of the drain pipeline close to the drain inlet, which can timely monitor the refrigeration running state of the refrigeration unit and avoid the blockage of the drain pipeline to cause poor refrigeration work. After detecting that the thickness of ice / frost exceeds the set threshold value, the working state of the refrigeration unit corresponding to the position of the drain pipeline is adjusted to defrosting in time through sound and light alarm or other prompt, and the auxiliary electric heating is turned on to improve the defrosting efficiency.

[0055] Specifically, it further comprises:

[0056] a plurality of second temperature detectors 55, which are uniformly arranged in the freezer, for acquiring the temperature data in the freezer.

[0057] Specifically, it further comprises:

[0058] a plurality of refrigeration unit refrigeration temperature detectors 6, which are respectively arranged at the refrigeration air outlets of the first refrigeration unit and the second refrigeration unit, for detecting the refrigeration capacity of the refrigeration unit.

[0059] An alarm 7 is connected with each temperature detector and laser sensor respectively, and is used to give an audible and light alarm for the refrigeration unit with non-conforming refrigeration capacity or the refrigeration unit with frost thickness exceeding the set range.

[0060] In the implementation, the second temperature detector 55 is arranged at a key temperature control position in the cold storage to monitor the refrigeration temperature of the cold storage in real time, and the refrigeration temperature detector 6 of the refrigeration unit is arranged near the air outlet of the refrigeration unit to monitor the refrigeration temperature of the refrigeration unit in real time. When the refrigeration temperature is not up to standard or exceeds the operating range of the cold storage, a pre-warning is given. At this time, it can be judged that the working state of the refrigeration unit currently performing refrigeration is poor, and maintenance or defrosting operation is needed to switch the refrigeration to another standby refrigeration unit. The specific model of the temperature detector is not described here, as long as it can detect the temperature and give feedback when the set temperature is exceeded. The person skilled in the art can select according to the specific actual scene.

[0061] Specifically, it further comprises:

[0062] A wireless alarm transceiver 8 connected with the alarm is used to transmit alarm information to the corresponding alarm receiving end according to the alarm information.

[0063] In the implementation, the wireless alarm transceiver can transmit the alarm signal of the alarm to the receiving end of the user or the designated receiving device through wireless transmission, and can also transmit in the form of short message. The specific transmission mode is not limited.

[0064] Specifically, the refrigeration pipelines of the two refrigeration units are connected by copper pipes, and the drainage pipelines of the drainage units are connected by PVC pipes. An electric auxiliary heating circuit is laid outside the drainage pipelines to heat and melt ice / snow.

[0065] In the implementation, when the defrosting function of any refrigeration unit is started, the electric auxiliary heating circuit can be turned on at the same time to speed up the defrosting speed and improve the defrosting rate. Specifically, the electric auxiliary heating circuit can be wound equidistantly outside the drainage pipelines, and a thermal insulation layer can be wrapped on the electric auxiliary heating circuit to avoid temperature loss. Preferably, a first electric auxiliary heating circuit is laid outside the drainage pipelines of the first refrigeration unit, and a second electric auxiliary heating circuit is laid outside the drainage pipelines of the second refrigeration unit. The two electric auxiliary heating circuits are controlled separately to improve the control flexibility.

[0066] Specifically, the cold storage control cabinet 5 further comprises:

[0067] A control display screen 56 is used to display the temperature data detected by each temperature detector and the alarm information of the alarm;

[0068] An input device 57 is connected to the control display screen to obtain inputted control information of the first and second refrigeration units.

[0069] In practice, the control display screen 56 can be arranged in the central control room of the cold storage or integrated on the cold air control cabinet, and the control of the cold storage cabinet (such as the on-off of the first and second relays 51 and 52, and the switching of the refrigeration or defrosting functions of each unit) is controlled through a plurality of control buttons or switches. The input device can be in the form of a keyboard or voice input to modify the parameters of the alarm control.

[0070] Specifically, the electric heating unit 4 is further connected with a timer to obtain the working time length of the electric heating unit.

[0071] In practice, the electric auxiliary heating does not need to be continuously operated after being turned on, and the heating time is set, and the electric auxiliary heating is separately turned off when the timer determines that the electric auxiliary heating time length is reached, so that energy waste is effectively avoided, and the efficiency of the active control of defrosting is improved.

[0072] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. An automated cold chain equipment defrosting and heating device, characterized in that, include: The first refrigeration unit and the second refrigeration unit have the same structure and operate in parallel through a circuit. The two refrigeration units are respectively equipped with a direct expansion refrigeration fan and a compressor for refrigerating and defrosting the cold storage. The first refrigeration unit and the second refrigeration unit alternately perform refrigeration or defrosting. The drainage unit is connected to the first refrigeration unit and the second refrigeration unit respectively, and is used to discharge the water generated during the defrosting process of the fan through the drainage pipe. The height of the drainage inlet connected to the refrigeration unit in the drainage pipe of the drainage unit is higher than the drainage outlet of the drainage pipe located outside the cold storage. An electric heating unit, which is connected to the first refrigeration unit and the second refrigeration unit respectively, is used to heat and defrost the fan and the drainage pipe, including a first electric heating component connected to the first refrigeration unit and a second electric heating component connected to the second refrigeration unit. The first electric heating component is installed on the drain pipe of the drain unit connected to the first refrigeration unit, and the second electric heating component is installed on the drain pipe of the drain unit connected to the second refrigeration unit, so as to assist the melting of ice on the drain pipe through electric heating.

2. The automated cold chain equipment defrosting and heating device according to claim 1, characterized in that, Also includes: The cold storage control cabinet is connected to the first refrigeration unit, the second refrigeration unit, and the electric heating unit via circuits to control the working status of the refrigeration units and the heating status of the electric heating unit.

3. The automated cold chain equipment defrosting and heating device according to claim 2, characterized in that, The cold storage control cabinet includes: The first relay and the second relay are connected in series with the circuit of the first refrigeration unit and in series with the circuit of the second refrigeration unit. The first relay and the second relay are connected in parallel to control the on / off state of the circuits of the two refrigeration units respectively. The on / off state of the first relay and the second relay is controlled by the corresponding control terminal of the cold storage control cabinet. Several first temperature detectors are respectively installed on the drain pipes of the two refrigeration units to detect the temperature of the inner wall of the drain pipes.

4. The automated cold chain equipment defrosting and heating device according to claim 3, characterized in that, The cold storage control cabinet also includes: Several laser sensors are positioned on the side of the drain pipe near the drain inlet to obtain the thickness of ice / frost inside the drain pipe.

5. The automated cold chain equipment defrosting and heating device according to claim 1, characterized in that, Also includes: Several second temperature detectors are evenly distributed inside the cold storage to obtain temperature data within the cold storage.

6. The automated cold chain equipment defrosting and heating device according to claim 1, characterized in that, Also includes: Several refrigeration temperature detectors are installed at the refrigeration air outlets of the first refrigeration unit and the second refrigeration unit, respectively, to detect the refrigeration capacity of the refrigeration units. The alarm is connected to each temperature detector and laser sensor to provide audible and visual alarms for refrigeration units whose cooling capacity does not meet the requirements or whose frost thickness exceeds the set range.

7. The automated cold chain equipment defrosting and heating device according to claim 6, characterized in that, Also includes: A wireless alarm transceiver is connected to the alarm device and is used to transmit alarm information to the corresponding alarm receiver based on the alarm information.

8. The automated cold chain equipment defrosting and heating device according to claim 1, characterized in that, The refrigeration pipes of the two refrigeration units are connected by copper pipes, and the drainage pipes of the drainage unit are connected by PVC pipes. An electric auxiliary heating line is laid on the outside of the drainage pipes to heat the drainage pipes for defrosting.

9. The automated cold chain equipment defrosting and heating device according to claim 3, characterized in that, The cold storage control cabinet also includes: The control display screen is used to display the temperature data detected by each temperature detector and the alarm information from the alarm. An input device, connected to the control display screen, is used to acquire control information for the first and second refrigeration units.

10. The automated cold chain equipment defrosting and heating device according to claim 1, characterized in that, The electric heating unit is also connected to a timer, which is used to obtain the working time of the electric heating unit.

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