CN210174712U

CN210174712U - Combined refrigeration cold chain transport vehicle

Info

Publication number: CN210174712U
Application number: CN201920816938.9U
Authority: CN
Inventors: Rui Pang; 逄锐
Original assignee: Fenzi Cold Chain Guangdong Technology Co Ltd
Current assignee: Fenzi Cold Chain Guangdong Technology Co Ltd
Priority date: 2019-06-02
Filing date: 2019-06-02
Publication date: 2020-03-24
Anticipated expiration: 2029-06-02

Abstract

The utility model belongs to cold chain transportation field, it discloses a joint refrigeration cold chain transport vechicle, include to use LNG as the vehicle of fuel, set up the box on the vehicle, still carry out the lift-launch and have liquid inert gas storage tank, the box in be equipped with and use liquid LNG and liquid inert gas to carry out the refrigerated heat transfer refrigerating system of heat exchange to the box inner space as the cold source. This cold chain transport vechicle is through carrying out the joint utilization to liquid inert gas and liquid LNG cold volume, can reduce liquid inert gas storage tank volume, reduce the vehicle volume, improve the commodity circulation distance, improve energy utilization and rate, avoids single liquid inert gas of using, the refrigeration fluctuation that single LNG of using brought as the cold source is big, the commodity circulation distance is short, the too big problem of equipment volume appears.

Description

Combined refrigeration cold chain transport vehicle

Technical Field

The utility model relates to a cold chain transportation field specifically is a joint refrigeration cold chain transport vechicle.

Background

The inventor of Huaxing Longhui (Beijing) Korsakoku corporation of the applicant proposed an invention patent application CN201811126598.3 in 2018, and discloses an intelligent multifunctional gas molecular cold chain vehicle, wherein the tail of the wall-mounted cold chain vehicle is hung on the head of the wall-mounted cold chain vehicle, a container heat preservation box is installed on the tail of the wall-mounted cold chain vehicle, and a refrigeration source is installed between the container heat preservation box and the head of the wall-mounted cold chain vehicle; the condenser unit is arranged outside the container heat insulation box, the refrigeration source is communicated into the container heat insulation box through a pipeline, and the gas molecular balance assembly is arranged at the top outside the container heat insulation box; the condenser unit provides a refrigerant for the container insulation can; the refrigeration source cools the container insulation box in a top spraying mode and provides environmental gas required by storage; the gas molecule balancing component balances various gas molecules in the container heat insulation box; the environment parameter regulating and controlling component regulates and controls the humidity in the container heat insulation box and the content of the gas to be stored for analysis; the artificial intelligence control system sends out a control instruction according to the received externally input control parameters or the parameters detected by the control parameter detection unit stored in advance, so that the internal environment of the container heat preservation box reaches the control parameters, and the internal materials are refrigerated and preserved or quickly frozen.

The core of the scheme is as follows: the food material fresh-keeping, deep cooling and other treatments are achieved by regulating and controlling the concentration and the temperature of various gas molecules in the box body.

Applicant Guangzhou allies oneself with commodity circulation limited company and puts forward a utility model patent application CN201621221676.4 in 2016, discloses a refrigerator car liquid nitrogen heat transfer refrigerating system, sets up on the refrigerator car, including liquid nitrogen container and defeated nitrogen pipe, the near-end of defeated nitrogen pipe is connected with the gas vent of liquid nitrogen container, and the far-end is introduced in the refrigerator car carriage along the top in refrigerator car carriage, defeated nitrogen pipe distal end shutoff, and the near-end of defeated nitrogen pipe is equipped with the control valve, is equipped with a plurality of liquid nitrogen shower nozzles in the refrigerator car carriage on the pipe wall of defeated nitrogen pipe, defeated nitrogen pipe adopts adiabatic pipe, adiabatic pipe includes inner tube and outer tube, forms vacuum interlayer between inner tube and outer tube, is equipped with the radiation screen that a plurality of layers are on a parallel with inner tube and outer. The liquid nitrogen refrigerant adopts clean energy as a refrigerant, and has the advantages of large refrigerating capacity, and quick and efficient refrigeration. The container realizes the fresh-keeping transportation of the farm fresh products under the condition of not increasing the power and energy consumption of the transportation tool.

It is understood that the container type refrigerator using liquid nitrogen or liquid carbon dioxide as a cold source has been a common means in the art.

The applicant, Zhejiang ocean university, proposed an invention patent application CN201810715803.3 in 2018, which discloses an LNG refrigerator car, comprising a car body, a gas engine, a heater, a control valve, an LNG liquid storage tank, a vaporizer and a refrigerator car; the gas engine is communicated with one end of the gasifier through a pipeline, and a heater is arranged between the gas engine and the gasifier; the LNG liquid storage tank is communicated with the other end of the gasifier through a pipeline, and a control valve is arranged between the LNG liquid storage tank and the gasifier; the front end of the refrigerator carriage is provided with a first partition plate which is a pore plate, the front end of the refrigerator carriage is divided into a refrigeration cavity by the first partition plate, and the gasifier is fixed in the refrigeration cavity through a supporting mechanism; the supporting mechanism comprises a first supporting component, a second supporting component and a connecting plate, sectional type refrigeration can be carried out by the scheme, the energy utilization rate is improved, and the energy-saving and environment-friendly effects are achieved.

The invention provides an invention patent application CN201310462726.2 in 2013 by Jiangsu Huamai gas equipment sales Limited company, which discloses a refrigeration method of an LNG refrigerator car and the refrigerator car thereof, and belongs to the technical field of cold energy utilization. The LNG releases a large amount of cold energy in the rewarming and gasifying stages, provides high-quality cold air for the refrigerator car, solves the refrigeration problem of the refrigerator car without additional energy consumption, greatly improves the comprehensive utilization rate of energy, and reduces the operation cost of the refrigerator car. According to the scheme, the evaporator is directly installed in the refrigerator wagon box, and the leakage sensor, the alarm, the defroster, the gasifier, the refrigerant storage box, the temperature sensor, the temperature controller and other equipment are additionally installed, so that the refrigerator wagon is simple in structure, small in cold energy loss, good in refrigeration effect, high in safety performance, low in operating cost, energy-saving and environment-friendly.

It is understood that the use of liquid LNG as a cold source to provide cold to a container refrigeration container is a common practice in the art.

However, the technical development in the art has only focused on refrigeration using a separate cold source, such as liquid nitrogen, or on LNG (liquefied natural gas) alone;

the above-mentioned techniques have drawbacks in that: if an independent cold source is adopted, the vehicle is just barely enough to mount 2 450L liquid nitrogen tanks in the journey of 2000-3000km, as shown in figure 1 of CN201811126598.3, wherein 4 450L liquid nitrogen tanks are mounted.

If LNG refrigeration is independently adopted, an air source is unstable along with the running of the vehicle, for example, the vehicle does not need LNG as fuel during parking, rest, transfer and the like, so that the stable supply of a cold source cannot be ensured.

And the table look-up shows that the liquid nitrogen cold energy is roughly as follows: 411 kJ/kg; the cold energy of the liquid LNG is approximately 830 kJ/kg; the cold energy refers to the heat quantity absorbed by the liquid nitrogen or the liquid LNG required to be recovered to the room temperature from the liquid state.

Therefore, the refrigeration capacity grade of both liquid nitrogen and liquid LNG is very high, and if the refrigeration capacity grade can be reasonably utilized, the energy consumption can be effectively reduced, the vehicle volume can be reduced, and the logistics distance can be increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a joint refrigeration cold chain transport vechicle, this cold chain transport vechicle can reduce liquid inert gas storage tank volume, reduce the vehicle volume, improve the commodity circulation distance, improve energy utilization rate through carrying out the joint utilization to liquid inert gas and liquid LNG cold volume, avoids single use liquid inert gas, single use LNG as the problem appearance that the refrigeration fluctuation that the cold source brought is big, the commodity circulation distance is short, equipment is bulky.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a joint refrigeration cold chain transport vechicle, includes the vehicle that uses LNG as the fuel, sets up the box on the vehicle, still carries with liquid inert gas storage tank, the box in be equipped with and use liquid LNG and liquid inert gas to carry out the refrigerated heat transfer refrigerating system of heat exchange to the box inner space as the cold source.

In the above combined refrigeration cold chain transport vehicle, the liquid inert gas is liquid carbon dioxide and/or liquid nitrogen.

The utility model discloses "and/or" mean: the liquid inert gas is liquid carbon dioxide, liquid nitrogen, liquid carbon dioxide and liquid nitrogen.

In the combined refrigeration cold chain transport vehicle, the vehicle is provided with a liquid LNG storage tank, and the heat exchange refrigeration system comprises a first heat exchange unit for guiding the cold energy of the liquid LNG in the liquid LNG storage tank into the box body and a second heat exchange unit for guiding the cold energy of the liquid inert gas in the liquid inert gas storage tank into the box body.

In the combined refrigeration cold chain transport vehicle, the first heat exchange unit is used for exchanging heat between one or more of liquid cold energy, gasification cold energy and cold energy of liquid LNG, and cold energy of LNG gas rewarming to a preset temperature and the inner space of the box body;

the second heat exchange unit is used for exchanging heat between one or more cold quantities of liquid cold quantity, gasification cold quantity and cold quantity of inert gas rewarming to a preset temperature and the inner space of the box body.

In the combined refrigeration cold chain transport vehicle, the first heat exchange unit comprises a first evaporator arranged in the box body, an inlet of the first evaporator is connected to the liquid LNG storage tank, and an outlet of the first evaporator is connected to the vehicle-mounted engine;

the second heat exchange unit comprises a second evaporator arranged in the box body, an inlet of the second evaporator is connected to the liquid inert gas storage tank, the second evaporator is provided with a first outlet, and the first outlet is communicated with the atmosphere.

In the combined refrigeration cold chain transport vehicle, the second evaporator is provided with a second outlet, and the second outlet is communicated with the inner space of the box body.

In the combined refrigeration cold chain transport vehicle, a first control valve is arranged at an inlet of the first evaporator, and a second control valve is arranged at an inlet of the second evaporator.

In the combined refrigeration cold chain transport vehicle, the first outlet and the second outlet are respectively provided with a third control valve and a fourth control valve.

In the combined refrigeration cold chain transport vehicle, the combined refrigeration cold chain transport vehicle further comprises a third heat exchange unit for gasifying the liquid LNG by using air and/or engine exhaust waste heat for the vehicle-mounted engine to use, and a fifth control valve is arranged at an inlet of the third heat exchange unit.

In the combined refrigeration cold chain transport vehicle, a temperature sensor is arranged in the box body, and the box body is a heat-insulation container.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a LNG and liquid inert gas jointly refrigerate as the cold source, it has following advantage:

the LNG and the liquid nitrogen or the liquid carbon dioxide have high refrigeration capacity, when the LNG and the liquid nitrogen or the liquid carbon dioxide are subjected to combined refrigeration, the volume and the number of the vehicle-mounted liquid inert gas storage tank can be reduced, through evaluation, under the condition of a logistics distance of 3000km plus 2000, 2-4 liquid nitrogen tanks with 450L, which are needed in the prior art, can be eliminated, and the liquid nitrogen tanks with the volume below 2L and the volume below 150L are replaced, the installation positions of the liquid nitrogen tanks can be flexibly selected, for example, the corner positions between a vehicle head and a box body are selected, and even the liquid nitrogen tanks are selected to be arranged in the box body, so that the vehicle volume can be effectively reduced, and meanwhile, the utilization efficiency of.

And the disadvantages of the LNG and the liquid nitrogen or the liquid carbon dioxide can be complemented by adopting combined refrigeration of the LNG and the liquid nitrogen or the liquid carbon dioxide, and the LNG and liquid nitrogen combined refrigeration system has the advantages of being suitable for long-distance logistics and stable in refrigeration. When the vehicle is in a continuous and stable transportation process, the LNG is used as a main cold source, the liquid inert gas is used as an auxiliary cold source for refrigeration and cold insulation, and when the vehicle stops running or a driver stops for rest, the liquid inert gas is used as the main cold source for refrigeration and cold insulation. The combination of the two can ensure the refrigeration stability in the transportation process and can ensure the refrigeration supply in the 2000-3000km material flow process.

The vehicle is reformed and the manufacturing cost is low, and because the volume and the number of the liquid inert gas storage tanks are reduced, the traditional refrigerator car using LNG as fuel does not need to obviously reform the frame main body, and only needs to reform the heat exchange refrigeration system to adapt to the existing vehicle.

Drawings

Fig. 1 is a perspective view of embodiment 1 of the present invention;

fig. 2 is a block diagram showing the structure of embodiment 1 of the present invention;

fig. 3 is a block diagram showing the structure of embodiment 1 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-2, a combined refrigeration cold chain transport vehicle includes a vehicle 1 using LNG as fuel, a tank 2 disposed on the vehicle 1, and a liquid inert gas storage tank 3, wherein a heat exchange refrigeration system using liquid LNG and liquid inert gas as cold sources to exchange heat and refrigerate the internal space of the tank 2 is disposed in the tank 2.

In the present embodiment, the liquid LNG is stored in the liquid LNG tank 4, which is a container on which the conventional LNG-fueled vehicle 1 is mounted. The liquid inert gas is present in a liquid inert gas reservoir 3, which is also a common vessel in the art. Generally, both the LNG tank 4 and the inert gas tank 3 have insulation layers, such as vacuum insulation layers or other insulation layers.

In the practical application process, the heat exchange refrigeration system is controlled by a vehicle-mounted controller or any other optional control mode, and even the manual control of the refrigeration major and minor components in the liquid LNG and the liquid inert gas is not excluded.

Specifically, in the transportation process, if the vehicle 1 runs normally, most of the heat exchange refrigeration systems adopt liquid LNG as a main cold source for refrigeration, and liquid inert gas as an auxiliary cold source for refrigeration; in the process of temporarily stopping the vehicle 1, such as the situations of rest of a driver, midway unloading and replenishing, temporary inspection, LNG filling and the like, the heat exchange refrigeration system adopts liquid inert gas as a main cold source for refrigeration, and does not adopt or slightly adopts liquid LNG as an auxiliary cold source for refrigeration in the idling state of the vehicle 1.

Of course, in practical applications, even if the vehicle 1 is in a normal driving state, the embodiment of cooling with liquid inert gas as the main cooling source is not excluded.

In this embodiment, the liquid inert gas is liquid nitrogen, and compared with liquid carbon dioxide, the liquid nitrogen has a higher cold quantity grade, does not need to be stored under pressure, and does not become dry ice to block a pipeline in the pressure relief process, so the liquid nitrogen is preferably used as one of cold sources in this embodiment.

However, the liquid carbon dioxide is also an optional better cold source, the price of the liquid carbon dioxide is 300 yuan/ton, the cold energy of the liquid carbon dioxide is approximately 650kJ/kg, the price of the liquid nitrogen is 500 yuan/ton and 1000 yuan/ton, and the cold energy of the liquid nitrogen is approximately: 411 kJ/kg; from the viewpoint of economy, it is more appropriate to use liquid carbon dioxide, and from the viewpoint of withstand voltage of the apparatus, it is more appropriate to use liquid nitrogen. In this embodiment, in order to reduce the pressure-resistant grade of the equipment, liquid nitrogen is used as a cold source. If liquid carbon dioxide is used as a cold source, the pipeline needs to be more pressure-resistant.

In this embodiment, the vehicle 1 is provided with a liquid LNG storage tank 4, and the heat exchange refrigeration system includes a first heat exchange unit 5 for introducing the cold energy of the liquid LNG in the liquid LNG storage tank 4 into the tank 2, and a second heat exchange unit 6 for introducing the cold energy of the liquid inert gas in the liquid inert gas storage tank 3 into the tank 2.

Specifically, the first heat exchange unit 5 is used for exchanging heat between the liquid cold quantity, the gasification cold quantity and the cold quantity of the liquid LNG, the cold quantity of the liquid LNG reheated to a preset temperature, and the internal space of the tank body 2;

the second heat exchange unit 6 is used for exchanging heat between the liquid cold quantity, the gasification cold quantity and the cold quantity of the liquid inert gas, which is reheated to the preset temperature, and the inner space of the box body 2.

The preset temperature is different according to different functions of the box body 2, if the box body 2 is used for fresh keeping, the temperature in the box body 2 generally needs to be controlled to 2-10 ℃, and the preset temperature can be selected from-10 ℃ to-20 ℃ and the like;

if the box 2 is used for storing frozen products, the temperature in the box 2 should be controlled below zero, and the preset temperature at this time should be lower, such as-20 ℃ or-30 ℃. In general, the preset temperature should be lower than the temperature required in the tank 2.

More specifically, the first heat exchange unit 5 and the second heat exchange unit 6 are both evaporators, and the evaporators can be implemented by any evaporator selected in the art, and in the embodiment, are arranged on the inner wall of the box body 2 in the form of evaporation coils.

In the present embodiment, the first heat exchange unit 5 includes a first evaporator 12 disposed in the tank 2, an inlet of the first evaporator 12 is connected to the liquid LNG storage tank 4, and an outlet of the first evaporator 12 is connected to the vehicle-mounted engine 7;

the first evaporator 12 is preferably an evaporator of a coil structure, and is arranged on the inner wall of the side of the box body 2 close to the vehicle head.

As an alternative, a fourth heat exchange unit 14 for warming the gaseous LNG discharged from the first evaporator 12 to normal temperature for use by the on-vehicle engine 7 may be further added between the first evaporator 12 and the inlet of the on-vehicle engine 7, referring to fig. 3.

The second heat exchange unit 6 comprises a second evaporator 13 arranged in the box body 2, an inlet of the second evaporator 13 is connected to the liquid inert gas storage tank 3, the second evaporator 13 is provided with a first outlet 8, and the first outlet 8 is communicated with the atmosphere.

Liquid nitrogen is introduced into the second evaporator 13 of the second heat exchange unit 6, and after the liquid nitrogen exchanges heat in the second evaporator 13 and is gasified to absorb heat, the gasified and heated nitrogen is discharged to the atmosphere from the first outlet 8.

The second evaporator 13 is preferably an evaporator of a coil structure, and is provided on the inner walls of the left and right sides or the left and right upper surfaces of the case 2.

The evaporator may be further provided with any component capable of improving heat exchange efficiency, such as a heat exchange fin, and the present embodiment is not limited to this.

As a preferable scheme of the present embodiment, the second evaporator 13 is provided with a second outlet 9, and the second outlet 9 is communicated with the inner space of the tank 2. This preferable design is suitable for the fresh-keeping box body 2, and the respiration of the plant, vegetable, and other articles is suppressed by supplying nitrogen gas into the box body 2 at a proper time to maintain the inert gas atmosphere in the box body 2.

In order to increase the refrigeration ratio of the cold source used in the combined refrigeration, the present embodiment preferably controls the amounts of the liquid inert gas and the LNG used for the refrigeration through electromagnetic valves, and specifically, the inlet of the first evaporator 12 is provided with a first control valve 10, and the inlet of the second evaporator 13 is provided with a second control valve 11.

As a preferable control means, the first control valve 10 and the second control valve 11, and the third control valve 15 and the fourth control valve 16 described later are all solenoid valves, and the opening degrees thereof are controlled by an onboard controller.

The selection of the main cold source in the refrigeration process can be controlled by controlling the opening degree of the first control valve 10 and the second control valve 11 through the vehicle-mounted controller.

Preferably, the first outlet 8 and the second outlet 9 are respectively provided with a third control valve 15 and a fourth control valve 16. The third control valve 15 and the fourth control valve 16 are mainly used for recycling the nitrogen gas discharged from the second evaporator 13, discharging a small amount of nitrogen gas into the tank 2, and maintaining the inert gas atmosphere in the tank 2.

In this embodiment, as a preferable scheme, referring to fig. 3, a third heat exchange unit 17 is further included, which gasifies the liquid LNG for use by the vehicle-mounted engine 7 using air and/or engine exhaust waste heat, and an inlet of the third heat exchange unit 17 is provided with a fifth control valve 18.

In the existing design, the liquid LNG is gasified mainly through a heat exchanger by using air and/or engine exhaust waste heat, and various waste heat is absorbed by water and then the water is introduced into the heat exchanger to gasify the liquid LNG.

The third heat exchange unit 17 is an existing device on an existing LNG-powered refrigerated transport vehicle, is not used for refrigerating the tank 2, and is mainly used for vaporizing the liquid LNG to form a gas of 0-40 ℃ and feeding the gas into the engine. The purpose of reserving the third heat exchange unit 17 is to switch the liquid LNG storage tank to the third heat exchange unit 17 when the tank 2 is not required to be refrigerated or empty, in order to facilitate the normal driving of the vehicle 1.

In order to facilitate the temperature regulation in the box body 2 and ensure the reliable control of the first control valve 10 and the second control valve 11, a temperature sensor 19 is arranged in the box body 2, and the opening degree of the first control valve 10 and the opening degree of the second control valve 11 are controlled by the data of the temperature sensor 19. If the temperature in the tank 2 is too high, the opening degree of the first control valve 10 or the opening degree of the second control valve 11 should be increased, or the opening degree of the second control valve 11 should be increased while the vehicle 1 is not required to travel, and otherwise, the opening degrees of the first control valve 10 and the second control valve 11 should be decreased.

As a preferable mode of the present embodiment, a gas sensor 20 may be further provided in the box 2, and the gas sensor 20 is used for detecting the content of oxygen and the like in the gas, and is used as a basis for data of the opening degree control of the third control valve 15 and the fourth control valve 16.

In this embodiment, the container body 2 is preferably a thermal container.

Of course, in this embodiment, it is not excluded to add a cooling mode in which heat conduction is performed by exchanging substances, such as cooling the thermal container by top spraying as described in CN 201811126598.3.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a joint refrigeration cold chain transport vechicle, includes the vehicle that uses LNG as the fuel, sets up the box on the vehicle, its characterized in that still carries with liquid inert gas storage tank, the box in be equipped with and use liquid LNG and liquid inert gas to carry out the refrigerated heat transfer refrigerating system of heat exchange to the box inner space as the cold source.

2. The integrated refrigeration cold chain transport vehicle of claim 1, wherein the liquid inert gas is liquid carbon dioxide and/or liquid nitrogen.

3. The combined refrigeration cold chain transport vehicle as claimed in claim 1, wherein the vehicle is provided with a liquid LNG storage tank, and the heat exchange refrigeration system comprises a first heat exchange unit for introducing the cold energy of the liquid LNG in the liquid LNG storage tank into the tank, and a second heat exchange unit for introducing the cold energy of the liquid inert gas in the liquid inert gas storage tank into the tank.

4. The combined refrigeration cold chain transport vehicle as claimed in claim 3, wherein the first heat exchange unit is used for exchanging heat between one or more of liquid cold of liquid LNG, gasification cold and cold of LNG gas rewarming to a preset temperature and the internal space of the box body;

5. The integrated refrigeration cold chain transport vehicle according to claim 3, wherein the first heat exchange unit comprises a first evaporator arranged in the box body, an inlet of the first evaporator is connected to the liquid LNG storage tank, and an outlet of the first evaporator is connected to the vehicle-mounted engine;

6. The integrated refrigeration cold chain transport vehicle of claim 5, wherein the second evaporator is provided with a second outlet, the second outlet communicating with the interior space of the tank.

7. An integrated refrigeration cold chain transport vehicle according to claim 5, wherein the inlet of said first evaporator is provided with a first control valve and the inlet of said second evaporator is provided with a second control valve.

8. The integrated refrigeration cold chain transport vehicle of claim 5, wherein the first outlet and the second outlet are provided with a third control valve and a fourth control valve, respectively.

9. A combined refrigeration cold chain transport vehicle according to any one of claims 1 to 8, further comprising a third heat exchange unit for vaporizing liquid LNG for use by an on-board engine by using air and/or engine exhaust heat, wherein an inlet of the third heat exchange unit is provided with a fifth control valve.

10. A combined refrigeration cold chain transport vehicle according to any of claims 1 to 8, wherein a temperature sensor is provided in the tank, and the tank is a thermal container.