Refrigerating unit of refrigerator car and refrigerator car

Abstract

The refrigerator car refrigerating unit comprises a refrigerating unit body, a direct current power supply circuit, a mains supply circuit and a control system, and the control system is used for controlling the refrigerating unit body to be switched and communicated with the direct current power supply circuit and the mains supply circuit and controlling the refrigerating unit body to be started and stopped. The commercial power supply circuit is provided with a commercial power plug access detection switch, the commercial power plug access detection switch is in signal connection with the control system, and the control system is provided with a display screen for displaying on and off of the commercial power plug access detection switch. When the refrigerating unit of the refrigerator car uses the mains supply mode, the connecting state of the mains supply plug connected into the detection switch can be detected, prompt information is sent out through the control panel, and therefore safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration units, and in particular to a refrigeration unit for a refrigerated vehicle and a refrigerated vehicle. Background Art

[0002] Refrigerated trucks are closed vans used to transport frozen or fresh goods. They are special transport vehicles equipped with refrigeration units and are often used to transport frozen foods, dairy products, vegetables and fruits, vaccines and medicines, etc. During the transportation and sales of goods, they will stay in the market for a long time. Since the market stipulates to avoid using the road mode as much as possible, most refrigeration units are equipped with AC power function. Due to the long-term use of the AC power mode, customers may forget to connect the AC power plug to the detection switch when leaving or moving the vehicle, which will eventually damage the line and cause personal safety accidents in serious cases.

[0003] The utility model patent with the authorization announcement number CN216231688U discloses a power supply control system for a refrigeration unit of a refrigerated truck and a refrigerated truck. The refrigeration unit includes a DC power supply circuit, a mains power supply circuit and a power switching control terminal. The power switching control terminal includes a control circuit, an AC power input detection port and a DC relay control port. The mains power supply circuit includes an AC feedback circuit. The AC feedback circuit is used to convert the AC signal in the mains power supply circuit into a weak current signal. The AC power input detection port is connected to the AC feedback circuit to detect whether the weak current signal exists. The DC relay control port is connected to the DC power supply circuit. The control circuit is connected to the AC power input detection port and the DC relay control port respectively. According to whether the weak current signal exists, the DC power supply circuit is controlled to be turned on or off through the DC relay control port, so as to realize the automatic switching of the power supply of the refrigeration unit of the new energy refrigerated truck, avoid power supply abnormality, and ensure the normal operation of the refrigeration unit. However, the device does not have the function of detecting and reminding the mains plug to be connected to the detection switch. Utility Model Content

[0004] In order to detect the connection status of the mains plug access detection switch when using the mains mode, and issue a prompt message through the control panel to improve safety, the technical solution adopted by the utility model is: a refrigeration unit for a refrigerated truck, including a refrigeration unit, a DC power supply circuit, a mains power supply circuit and a control system, the control system is used to control the refrigeration unit to switch the DC power supply circuit and the mains power supply circuit, and control the start and stop of the refrigeration unit, the mains power supply circuit is provided with a mains plug access detection switch, the mains plug access detection switch is connected to the control system signal, and the control system is provided with a display screen that displays the on and off of the mains plug access detection switch.

[0005] Based on the above, the AC power supply circuit includes a AC plug, a AC socket and a transmission line. The AC plug is provided with a plug conductive part, and the AC socket is provided with a socket conductive part plugged with the plug conductive part. The AC plug access detection switch is provided on the socket conductive part, and a conductive feeler is also provided on the socket conductive part. When the plug conductive part is plugged with the socket conductive part, the AC plug access detection switch is closed.

[0006] Based on the above, the mains power supply circuit is provided with a transformer rectifier and a mains power control box, and the mains power control box is provided with an AC contactor and a thermal relay.

[0007] Based on the above, in order to facilitate manual control, a manual battery switch is provided on the DC power supply circuit.

[0008] Based on the above, the refrigeration unit includes a mains compressor, a road compressor, an oil separator, an expansion valve, a stop valve, a defrost valve, a condenser, a condensing fan, an evaporator and an evaporating fan which are connected through pipelines to form a refrigeration circuit.

[0009] The utility model also provides a refrigerated vehicle, which is equipped with the refrigerated vehicle refrigeration unit.

[0010] Specifically, when the mains plug access detection switch detects the mains connection status, it mainly uses the diode D18, the resistor R48 connected to 3.3V, and the R0603 resistor. When the plug conductive part is plugged into the socket conductive part, the mains plug access detection switch is closed. At this time, the diode D18 is connected to the negative pole. When the IO port of the single-chip computer detects a low level, it is considered that the mains plug access detection switch is connected, and the mains plug access detection switch icon is displayed on the control panel. When the mains plug access detection switch is disconnected, the detection switch will be disconnected because it loses the squeezing effect of the mains plug. At this time, the signal input end in the detection circuit is suspended, and the single-chip computer IO does not detect a low level. It is considered that the mains plug access detection switch is not connected, and the mains plug access detection switch icon is off.

[0011] The utility model has substantial features and progress compared to the prior art. Specifically, the refrigeration unit for a refrigerated vehicle provided by the utility model is provided with a mains plug access detection switch including a mains plug access detection switch detection in the unit, so that when the mains plug access detection switch is inserted into the socket, the squeeze of the plug will cause the switch inside the mains plug access detection switch to close, and the detection circuit will know that the mains plug access detection switch has been connected. Therefore, when the refrigeration unit for a refrigerated vehicle is in the mains mode, it can detect the connection status of the mains plug access detection switch and send a prompt message through the control panel, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the overall structure of a refrigeration unit for a refrigerated truck.

[0013] Figure 2 The utility model is a schematic diagram of the structure of a mains plug access detection switch in a refrigeration unit of a refrigerated vehicle.

[0014] Figure 3 The utility model is a schematic diagram of the detection principle of the state of the mains plug access detection switch in the refrigeration unit of the refrigerated vehicle.

[0015] Figure 4 The utility model is a schematic diagram of the structure of a control panel in a refrigeration unit of a refrigerated vehicle.

[0016] Figure 5 The utility model is a schematic diagram of the circuit principle of a refrigeration unit of a refrigerated vehicle.

[0017] In the figure: 1. AC compressor; 2. Spare liquid outlet pipeline; 3. Spare liquid return pipeline; 4. High-pressure pipeline; 5. Low-pressure pipeline; 6. Condenser; 7. Condenser liquid inlet pipe; 8. Stop valve; 9. Oil separator; 10. Oil return pipeline; 11. Suction pressure regulating valve; 12. Gas separator; 13. First connecting hose; 14. Buffer pipe; 15. Evaporator; 16. Expansion valve; 17. Defrost pipeline; 18. Condenser liquid outlet pipe; 19. Drying bottle; 20. Road compressor; 21. Liquid storage tank; 22. AC socket; 23. Socket conductive part; 24. AC plug access detection switch; 25. Conductive feeler; 26. Plug conductive part; 27. AC plug; 28. Defrost valve. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0019] Example 1

[0020] This embodiment provides a refrigeration unit for a refrigerated truck, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes a refrigeration unit, a DC power supply circuit, a mains power supply circuit and a control system. The control system is used to control the refrigeration unit to switch between the DC power supply circuit and the mains power supply circuit, and to control the start and stop of the refrigeration unit.

[0021] The mains power supply circuit is provided with a mains plug access detection switch 24, which is connected to the control system signal, and the control system is provided with a display screen that displays the on and off status of the mains plug access detection switch.

[0022] Specifically, Figure 2 As shown, the mains power supply circuit includes a mains plug 27, a mains socket 22 and a transmission line. A plug conductive member 26 is provided in the mains plug 27, a socket conductive member 23 plugged with the plug conductive member 26 is provided in the mains socket 22, and the mains plug access detection switch 24 is provided on the socket conductive member 23. A conductive feeler 25 is also provided on the socket conductive member 23. When the plug conductive member 26 is plugged with the socket conductive member 23, the mains plug access detection switch 24 is closed.

[0023] like Figure 3 and Figure 4 As shown, when the mains plug access detection switch detects the mains connection status, it mainly uses diode D18, resistor R48 connected to 3.3V, and resistor R0603. When the plug conductive part is plugged into the socket conductive part, the mains plug access detection switch is closed. At this time, diode D18 is connected to the negative pole. When the MCU IO port detects a low level, it is considered that the mains plug access detection switch is connected, and the mains plug access detection switch icon is displayed on the control panel. When the mains plug access detection switch is disconnected, the detection switch will be disconnected because it loses the squeezing effect of the mains plug. At this time, the signal input end in the detection circuit is suspended, and the MCU IO does not detect a low level. It is considered that the mains plug access detection switch is not connected, and the mains plug access detection switch icon is off.

[0024] Specifically, Figure 5 As shown, the mains power supply circuit is provided with a transformer rectifier and a mains power control box, and the mains power control box is provided with an AC contactor and a thermal relay.

[0025] The control system has dual power supply, one is powered by ACC through A1 port, and the other is powered by AC power control box through A8 port. When the control panel detects two power supplies and detects that the AC plug access detection switch has received a signal, the AC plug access detection switch icon will flash, and the control panel screen will display prompts such as "AC mode, do not drive" to remind users to pay attention to safety.

[0026] like Figure 1 As shown, in this embodiment, the refrigeration unit includes a mains compressor 1, a road compressor 20, an oil separator 9, an expansion valve 16, a stop valve 8, a defrost valve 28, a condenser 6, a condensing fan, an evaporator 15 and an evaporating fan which are connected by pipelines to form a refrigeration circuit.

[0027] Specifically, the outlet end of the evaporator 15 is provided with a low-pressure pipeline 5 connected to the return air end of the road compressor 20. The low-pressure pipeline 5 is provided with a buffer pipe 14, a first connecting hose 13, a gas separator 12, and an air intake pressure regulating valve 11.

[0028] The exhaust end of the road compressor 20 is connected to a high-pressure pipeline 4 , and the high-pressure pipeline 4 is connected to an oil separator 9 .

[0029] The lower end of the oil separator 9 is provided with two outlets, one outlet is directly connected to the evaporator 15 through the defrost pipeline 17, and the other outlet is connected to the condenser 6 through the stop valve 8 and the condenser liquid inlet pipe 7. The upper end of the oil separator 9 is connected to the low-pressure pipeline 5 through the oil return pipeline 10.

[0030] The outlet end of the condenser 6 is connected to the buffer tube 14 through the condenser liquid outlet pipe 18. The condenser liquid outlet pipe 18 is provided with a liquid storage container 21 and a drying bottle 19.

[0031] One end of the buffer tube 14 is connected to the inlet end of the evaporator 15 through a connecting branch pipe, and the connecting branch pipe is provided with an expansion valve 16. A refrigerant recovery pipe is connected between the expansion valve 16 and the first connecting hose.

[0032] The mains compressor 1 is provided with a spare liquid outlet pipeline 2 and a spare liquid return pipeline 3, wherein the spare liquid outlet pipeline 2 is connected to the high-pressure pipeline 4. The spare liquid return pipeline 3 is connected to the low-pressure pipeline 5. The spare liquid outlet pipeline 2 is provided with a one-way valve.

[0033] In this embodiment, the control system is a single chip microcomputer of the 80C51 series. An evaporating fan is provided on the evaporator, and a condensing fan is provided on the condenser.

[0034] The refrigeration unit for refrigerated vehicles provided in this embodiment, when using the mains mode, the mains plug access detection switch is inserted into the socket and triggers the internal switch. Through the detection of the relevant circuit, the connector status can be detected, and the mains plug icon is electrically lit through the control panel to remind the customer that the mains plug access detection switch is connected. When it is detected that the ACC and the mains low voltage are supplying power to the control panel at the same time, the control panel screen displays slogans such as "Do not drive" and "Be careful", and the mains icon flashes to remind the user to be careful.

[0035] When the AC power plug access detection switch is in the disconnected state, the detection switch will be disconnected because it loses the squeezing effect of the AC power plug. At this time, the signal input end in the detection circuit is suspended, and the microcontroller IO does not detect a low level. It is considered that the AC power plug access detection switch is not connected, and the AC power plug access detection switch icon goes out.

[0036] Example 2

[0037] This embodiment provides a refrigeration unit for a refrigerated truck, and the main difference from Embodiment 1 is that in this embodiment: in order to facilitate manual control, a manual battery switch is provided on the DC power supply circuit.

[0038] Example 3

[0039] This embodiment provides a refrigerated truck, which is equipped with the refrigerated truck refrigeration unit described in Embodiment 1 or Embodiment 2.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A refrigeration unit for a refrigerated vehicle, comprising a refrigeration unit, a DC power supply circuit, a mains power supply circuit and a control system, wherein the control system is used to control the refrigeration unit to switch between the DC power supply circuit and the mains power supply circuit, and to control the start and stop of the refrigeration unit, characterized in that: The mains power supply circuit is provided with a mains plug access detection switch, the mains plug access detection switch is connected to the control system signal, and the control system is provided with a display screen that displays the on and off of the mains plug access detection switch.

2. The refrigeration unit for a refrigerated vehicle according to claim 1, characterized in that: The mains power supply circuit includes a mains plug, a mains socket and a transmission line. The mains plug is provided with a plug conductive part, and the mains socket is provided with a socket conductive part plugged with the plug conductive part. The mains plug access detection switch is provided on the socket conductive part, and a conductive feeler is also provided on the socket conductive part. When the plug conductive part is plugged with the socket conductive part, the mains plug access detection switch is closed.

3. The refrigeration unit for a refrigerated vehicle according to claim 1 or 2, characterized in that: The mains power supply circuit is provided with a transformer rectifier and a mains power control box, and the mains power control box is provided with an AC contactor and a thermal relay.

4. The refrigeration unit for a refrigerated vehicle according to claim 1, characterized in that: The DC power supply circuit is provided with a manual battery switch.

5. The refrigeration unit for a refrigerated vehicle according to claim 1, 2 or 4, characterized in that: The refrigeration unit comprises a mains compressor, a road compressor, an oil separator, an expansion valve, a stop valve, a defrost valve, a condenser, a condensing fan, an evaporator and an evaporating fan which are connected through pipelines to form a refrigeration circuit.

6. A refrigerated vehicle, characterized in that: The refrigerated truck is equipped with a refrigeration unit for a refrigerated truck as claimed in any one of claims 1 to 5.

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