CN215284280U - Transport refrigeration system - Google Patents

Abstract

The transport refrigeration system provided by the application comprises a three-position four-way valve and a plurality of refrigeration devices. The plurality of refrigeration devices includes a first device group, a second device group, a third device group, and a fourth device group. The three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected with the output end of the first equipment group, the second oil port is connected with the output end of the second equipment group, the third oil port is connected with the input end of the third equipment group, and the fourth oil port is connected with the input end of the fourth equipment group. When the transportation refrigeration system works, the first oil port and the second oil port are selected to be communicated, and the third oil port and the fourth oil port are selected to be communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode. So set up, make through three-position cross valve integration refrigeration, refrigerant wash and three kinds of modes of defrosting, promoted the refrigerant circulation volume when defrosting the mode, improve the work efficiency of complete machine, and simplify the pipe-line system.

Description

Transport refrigeration system

Technical Field

The application relates to the field of air conditioning equipment, in particular to a transportation refrigeration system.

Background

In the related art, the transport refrigeration system employs a microchannel condenser or a tube-fin condenser, but a part of refrigerant is stored in the drying reservoir or the condenser, which causes a situation of insufficient refrigerant circulation amount in a defrosting mode or a heating mode, and increases the complexity of the system.

SUMMERY OF THE UTILITY MODEL

The application provides a transportation refrigeration system aiming at improving the circulation rate of a refrigerant.

The present application provides a transport refrigeration system comprising:

the refrigeration equipment comprises a three-position four-way valve and a plurality of refrigeration equipment, wherein the refrigeration equipment comprises a first equipment group, a second equipment group, a third equipment group and a fourth equipment group, the three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is connected with the output end of the first equipment group, the second oil port is connected with the output end of the second equipment group, the third oil port is connected with the input end of the third equipment group, and the fourth oil port is connected with the input end of the fourth equipment group; the input end of the first equipment group is connected with the output end of the second equipment group, the input end of the second equipment group is connected with the output end of the third equipment group, and the input end of the third equipment group is also connected with the output end of the fourth equipment group; and

when the transportation refrigeration system works, one of the first oil port and the second oil port is communicated, and the other of the third oil port and the fourth oil port is communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode.

Optionally, the first equipment group comprises a condenser, the second equipment group comprises an oil separator, a compressor and a gas-liquid separator, the third equipment group comprises an evaporator and a heat exchanger, and the fourth equipment group comprises a drying reservoir;

the input end of the condenser is connected with the output end of the oil separator, the input end of the oil separator is connected with the output end of the compressor, and the input end of the compressor is connected with the output end of the gas-liquid separator;

the heat exchanger comprises a first input end, a first output end, a second input end and a second output end, the output end of the drying liquid storage device is connected with the first input end, the first output end is connected with the input end of the evaporator, the output end of the evaporator is connected with the second input end, and the second output end is connected with the input end of the gas-liquid separator;

the first oil port is connected with the output end of the condenser, the second oil port is connected with the output end of the oil separator, the third oil port is connected with the input end of the evaporator, and the fourth oil port is connected with the input end of the drying liquid storage device.

Optionally, the transportation refrigeration system is in during the refrigeration mode, first hydraulic fluid port with the fourth hydraulic fluid port switches on, the output intercommunication of condenser the first hydraulic fluid port, the fourth hydraulic fluid port intercommunication the input of dry reservoir makes the compressor the oil content ware the condenser the first hydraulic fluid port the fourth hydraulic fluid port dry reservoir the first input the first output the evaporimeter the second input the second output the vapour and liquid separator forms the refrigeration circuit.

Optionally, when the transportation refrigeration system is in the refrigerant flushing mode, the second oil port and the fourth oil port are communicated, the output end of the oil separator is communicated with the second oil port, and the fourth oil port is communicated with the input end of the drying reservoir, so that the compressor, the oil separator, the second oil port, the fourth oil port, the drying reservoir, the first input end, the first output end, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigerant flushing loop.

Optionally, when the transportation refrigeration system is in the defrosting mode, the second oil port and the third oil port are communicated, the output end of the oil separator is communicated with the second oil port, and the third oil port is communicated with the input end of the evaporator, so that the compressor, the oil separator, the second oil port, the third oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a defrosting loop.

Optionally, the transportation refrigeration system includes condenser inlet solenoid valve, thermal expansion valve and suction pressure regulating valve, condenser inlet solenoid valve connect in the oil content ware the output with between the input of condenser, thermal expansion valve connect in first output with between the input of evaporimeter, suction pressure regulating valve connect in vapour and liquid separator's output with between the input of compressor.

Optionally, the first equipment group comprises an oil separator, a compressor and a gas-liquid separator, the second equipment group comprises a condenser, the third equipment group comprises a drying accumulator, and the fourth equipment group comprises an evaporator and a heat exchanger;

the first oil port is connected with the output end of the oil separator, the input end of the oil separator is connected with the output end of the compressor, the input end of the compressor is connected with the output end of the gas-liquid separator, the input end of the condenser is connected with the output end of the oil separator, the second oil port is connected with the output end of the condenser, and the third oil port is connected with the input end of the drying liquid storage device;

the heat exchanger comprises a first input end, a first output end, a second input end and a second output end, wherein the first input end is connected with the output end of the drying liquid storage device, the first output end is connected with the input end of the evaporator, the second input end is connected with the output end of the evaporator, the second output end is connected with the input end of the gas-liquid separator, and the fourth oil port is connected with the input end of the evaporator;

the transportation refrigeration system comprises a one-way valve, and the one-way valve is connected between the fourth oil port and the input end of the drying liquid storage device.

Optionally, the transportation refrigeration system is in during the refrigeration mode, the second hydraulic fluid port with the third hydraulic fluid port switches on, the output intercommunication of condenser the second hydraulic fluid port, the third hydraulic fluid port intercommunication the input of dry reservoir makes the compressor the oil content ware the condenser the second hydraulic fluid port the third hydraulic fluid port dry reservoir the first input the first output the evaporator the second input the second output the vapour and liquid separator forms the refrigeration circuit.

Optionally, when the transport refrigeration system is in the refrigerant flushing mode, the second oil port and the fourth oil port are communicated, the output end of the condenser is communicated with the second oil port, and the fourth oil port is communicated with the input end of the evaporator, so that the compressor, the oil separator, the condenser, the second oil port, the fourth oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigerant flushing loop.

Optionally, when the transportation refrigeration system is in the defrosting mode, the first oil port and the fourth oil port are communicated, the output end of the oil separator is communicated with the first oil port, and the fourth oil port is communicated with the input end of the evaporator, so that the compressor, the oil separator, the first oil port, the fourth oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a defrosting loop; or

The transportation refrigeration system is in when the defrosting mode, first hydraulic fluid port with the fourth hydraulic fluid port switches on, the output intercommunication of oil content ware the first hydraulic fluid port, the fourth hydraulic fluid port passes through the check valve intercommunication the input of dry reservoir makes the compressor, the oil content ware the first hydraulic fluid port the fourth hydraulic fluid port the dry reservoir the first input, the first output the evaporimeter, the second input the second output, vapour and liquid separator forms the defrosting return circuit.

Optionally, the transportation refrigeration system includes condenser inlet solenoid valve, thermal expansion valve and suction pressure regulating valve, condenser inlet solenoid valve connect in the oil content ware the output with between the input of condenser, thermal expansion valve connect in first output with between the input of evaporimeter, suction pressure regulating valve connect in vapour and liquid separator's output with between the input of compressor.

Optionally, the three-position four-way valve comprises a cavity, at least two pistons, a valve core rod and at least two coils, wherein the at least two pistons are arranged in the cavity, the valve core rod traverses the cavity and is connected in series with the at least two pistons, and the at least two coils are respectively fixed at two ends of the valve core rod;

the first oil port is fixed on one side of the cavity, the second oil port, the third oil port and the fourth oil port are fixed on one side of the cavity side by side and opposite to the first oil port, and the conduction states of the first oil port, the second oil port, the third oil port and the fourth oil port are adjusted through at least two pistons, the valve core rod and at least two coils in movable fit with each other.

The transport refrigeration system provided by the application comprises a three-position four-way valve and a plurality of refrigeration devices. The plurality of refrigeration devices includes a first device group, a second device group, a third device group, and a fourth device group. The three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected with the output end of the first equipment group, the second oil port is connected with the output end of the second equipment group, the third oil port is connected with the input end of the third equipment group, and the fourth oil port is connected with the input end of the fourth equipment group. When the transportation refrigeration system works, the first oil port and the second oil port are selected to be communicated, and the third oil port and the fourth oil port are selected to be communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode. So, through setting up three position cross valves and come integrated refrigeration, refrigerant to wash and three kinds of modes of defrosting, promoted the refrigerant circulation volume when defrosting the mode, improve the work efficiency of complete machine, and simplify pipe-line system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram illustrating the construction of a transport refrigeration system according to an exemplary embodiment of the present application;

FIG. 2 is a schematic circuit diagram of the transport refrigeration system of FIG. 1 in a refrigeration mode;

FIG. 3 is a schematic circuit diagram of the transport refrigeration system of FIG. 1 in a refrigerant flushing mode;

FIG. 4 is a schematic circuit diagram of the transport refrigeration system of FIG. 1 in a defrost mode;

FIG. 5 is a schematic illustration of a transport refrigeration system according to another exemplary embodiment of the present application;

FIG. 6 is a schematic circuit diagram of the transport refrigeration system of FIG. 5 in a refrigeration mode;

FIG. 7 is a schematic circuit diagram of the transport refrigeration system of FIG. 5 in a refrigerant flushing mode;

FIG. 8 is a schematic diagram of an exemplary embodiment of the transport refrigeration system of FIG. 5 in a defrost mode;

fig. 9 is a schematic diagram of another exemplary embodiment of the transport refrigeration system of fig. 5 in a defrost mode.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The transport refrigeration system provided by the application comprises a three-position four-way valve and a plurality of refrigeration devices. The plurality of refrigeration devices includes a first device group, a second device group, a third device group, and a fourth device group. The three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected with the output end of the first equipment group, the second oil port is connected with the output end of the second equipment group, the third oil port is connected with the input end of the third equipment group, and the fourth oil port is connected with the input end of the fourth equipment group. The input end of the first equipment group is connected with the output end of the second equipment group, the input end of the second equipment group is connected with the output end of the third equipment group, and the input end of the third equipment group is also connected with the output end of the fourth equipment group. When the transportation refrigeration system works, the first oil port and the second oil port are selected to be communicated, and the third oil port and the fourth oil port are selected to be communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode.

The transport refrigeration system provided by the application comprises a three-position four-way valve and a plurality of refrigeration devices. The plurality of refrigeration devices includes a first device group, a second device group, a third device group, and a fourth device group. The three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected with the output end of the first equipment group, the second oil port is connected with the output end of the second equipment group, the third oil port is connected with the input end of the third equipment group, and the fourth oil port is connected with the input end of the fourth equipment group. When the transportation refrigeration system works, the first oil port and the second oil port are selected to be communicated, and the third oil port and the fourth oil port are selected to be communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode. So, through setting up three position cross valves and come integrated refrigeration, refrigerant to wash and three kinds of modes of defrosting, promoted the refrigerant circulation volume when defrosting the mode, improve the work efficiency of complete machine, and simplify pipe-line system.

Fig. 1 is a schematic structural diagram of a transport refrigeration system 1 according to an exemplary embodiment of the present application. In the example shown in fig. 1, the transport refrigeration system 1 is exemplified by a VP (vehicle driven) transport refrigeration system 1. As shown in fig. 1, a transport refrigeration system 1 includes a three-position, four-way valve 2 and a plurality of refrigeration units 3. The plurality of freezing apparatuses 3 includes a first apparatus group 30, a second apparatus group 31, a third apparatus group 32, and a fourth apparatus group 33. The three-position, four-way valve 2 includes a first port 20, a second port 21, a third port 22, and a fourth port 23. The first oil port 20 is connected with an output end of the first equipment group 30, the second oil port 21 is connected with an output end of the second equipment group 31, the third oil port 22 is connected with an input end of the third equipment group 32, and the fourth oil port 23 is connected with an input end of the fourth equipment group 33. The input of the first device group 30 is connected to the output of the second device group 31, the input of the second device group 31 is connected to the output of the third device group 32, and the input of the third device group 32 is further connected to the output of the fourth device group 33. When the transportation refrigeration system 1 works, one of the first oil port 20 and the second oil port 21 is selected to be communicated, and one of the third oil port 22 and the fourth oil port 23 is selected to be communicated, so that the transportation refrigeration system 1 is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode. By providing the three-position four-way valve 2 in the transport refrigeration system 1, the first port 20 and the second port 21 of the three-position four-way valve 2 are alternatively turned on, and the third port 22 and the fourth port 23 are alternatively turned on. For example, the first oil port 20 and the third oil port 22 are communicated, or the first oil port 20 and the fourth oil port 23 are communicated, or the second oil port 21 and the third oil port 22 are communicated, or the second oil port 21 and the fourth oil port 23 are communicated, so that the transportation refrigeration system 1 forms a plurality of different loops, the transportation refrigeration system 1 is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode, the refrigerant circulation amount in the defrosting mode is increased, the working efficiency of the whole machine is improved, and a pipeline system is simplified.

In some embodiments, the three-position four-way valve 2 comprises a cavity 24, at least two pistons 25, a valve core rod 26 and at least two coils 27, wherein the at least two pistons 25 are arranged in the cavity 24, the valve core rod 26 traverses the cavity 24 and is connected in series with the at least two pistons 25, and the at least two coils 27 are respectively fixed at two ends of the valve core rod 26. The first oil port 20 is fixed to one side of the cavity 24, the second oil port 21, the third oil port 22 and the fourth oil port 23 are fixed to one side of the cavity 24 side by side and opposite to the first oil port 20, and the conduction states of the first oil port 20, the second oil port 21, the third oil port 22 and the fourth oil port 23 are adjusted through the movable fit among at least two pistons 25, the valve core rod 26 and at least two coils 27. Two pistons 25 are arranged in the cavity 24 side by side, the valve core rod 26 traverses the cavity 24 and is connected with at least two pistons 25 in series, and coils 27 are respectively arranged at two ends of the valve core rod 26. One of the two coils 27 is controlled to be powered on through an external system, so that the valve core rod 26 drives the two pistons 25 to move towards one side, and therefore the first oil port 20 and the third oil port 22 are communicated, or the first oil port 20 and the fourth oil port 23 are communicated, or the second oil port 21 and the third oil port 22 are communicated, or the second oil port 21 and the fourth oil port 23 are communicated, so that the transportation refrigeration system 1 forms a plurality of different loops, and the transportation refrigeration system 1 is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode.

With continued reference to fig. 1, in some embodiments, in the transport refrigeration system 1, exemplified in VP mode, the first equipment group 30 includes a condenser 4, the second equipment group 31 includes an oil separator 5, a compressor 6, and a gas-liquid separator 7, the third equipment group 32 includes an evaporator 8 and a heat exchanger 9, and the fourth equipment group 33 includes a drying accumulator 10. The input end of the condenser 4 is connected with the output end of the oil separator 5, the input end of the oil separator 5 is connected with the output end of the compressor 6, and the input end of the compressor 6 is connected with the output end of the gas-liquid separator 7. The heat exchanger 9 comprises a first input 90, a first output 91, a second input 92 and a second output 93, wherein the output of the drying reservoir 10 is connected with the first input 90, the first output 91 is connected with the input of the evaporator 8, the output of the evaporator 8 is connected with the second input 92, and the second output 93 is connected with the input of the gas-liquid separator 7. The first oil port 20 is connected with the output end of the condenser 4, the second oil port 21 is connected with the output end of the oil separator 5, the third oil port 22 is connected with the input end of the evaporator 8, and the fourth oil port 23 is connected with the input end of the drying liquid reservoir 10. In this embodiment, the transport refrigeration system 1 is in a VP mode, the plurality of refrigeration devices 3 include a compressor 6, an oil separator 5, a condenser 4, a three-position four-way valve 2, a drying reservoir 10, a heat exchanger 9, an evaporator 8, and a gas-liquid separator 7, and the connection relationship between the plurality of refrigeration devices 3 can be changed by controlling the three-position four-way valve 2, so that the transport refrigeration system 1 forms a plurality of different loops, and the transport refrigeration system 1 in the VP mode is switched among at least three operation modes, i.e., a refrigeration mode, a refrigerant flushing mode, and a defrosting mode, so as to increase the refrigerant circulation amount of the transport refrigeration system 1 in the VP mode in the defrosting mode, and improve the operation efficiency of the entire unit.

Fig. 2 is a schematic circuit diagram of the transport refrigeration system 1 provided herein in a refrigeration mode. Referring to fig. 2, when the transportation refrigeration system 1 is in the refrigeration mode, the first oil port 20 and the fourth oil port 23 are connected, the output end of the condenser 4 is communicated with the first oil port 20, and the fourth oil port 23 is communicated with the input end of the drying reservoir 10, so that the compressor 6, the oil separator 5, the condenser 4, the first oil port 20, the fourth oil port 23, the drying reservoir 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a refrigeration loop. In this embodiment, the coil 27 on the left side of the three-position four-way valve 2 is powered, so that the valve core rod 26 drives the two pistons 25 to move to the left side, and thus the first oil port 20 and the fourth oil port 23 are conducted, and the output end of the condenser 4 can be communicated with the first oil port 20, and the fourth oil port 23 is communicated with the input end of the drying reservoir 10. And the second oil port 21 and the third oil port 22 are not communicated, so that a branch between the output end of the oil separator 5 and the second oil port 21 is not communicated and a branch between the third oil port 22 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the condenser 4, the first oil port 20, the fourth oil port 23, the drying accumulator 10, the first input port 90, the first output port 91, the evaporator 8, the second input port 92, the second output port 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 2) to form a refrigeration circuit, and the transport refrigeration system 1 performs a refrigeration mode.

Fig. 3 is a schematic circuit diagram of the transport refrigeration system 1 in the refrigerant flushing mode according to the present application. Referring to fig. 3, when the transportation refrigeration system 1 is in the refrigerant flushing mode, the second oil port 21 and the fourth oil port 23 are connected, the output end of the oil separator 5 is communicated with the second oil port 21, and the fourth oil port 23 is communicated with the input end of the drying reservoir 10, so that the compressor 6, the oil separator 5, the second oil port 21, the fourth oil port 23, the drying reservoir 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a refrigerant flushing loop. In this embodiment, the coil 27 on the right side of the three-position four-way valve 2 is powered on, so that the valve core rod 26 drives the two pistons 25 to move towards the right side, and thus the second oil port 21 and the fourth oil port 23 are conducted, and the output end of the oil separator 5 can be communicated with the second oil port 21, and the fourth oil port 23 is communicated with the input end of the drying reservoir 10. And the first port 20 and the third port 22 are not communicated, so that a branch between the output end of the condenser 4 and the first port 20 is not communicated and a branch between the third port 22 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the second oil port 21, the fourth oil port 23, the drying reservoir 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 3) to form a refrigerant flushing loop, and the transport refrigeration system 1 performs a refrigerant flushing mode.

Fig. 4 is a schematic circuit diagram of the transport refrigeration system 1 provided by the present application in a defrost mode. Referring to fig. 4, when the transportation refrigeration system 1 is in the defrosting mode, the second oil port 21 and the third oil port 22 are communicated, the output end of the oil separator 5 is communicated with the second oil port 21, and the third oil port 22 is communicated with the input end of the evaporator 8, so that the compressor 6, the oil separator 5, the second oil port 21, the third oil port 22, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a defrosting circuit. In this embodiment, the coil 27 at both ends of the spool rod 26 of the three-position four-way valve 2 is powered off, and the two pistons 25 are restored to the initial positions, so that the second port 21 and the third port 22 are conducted, and the output end of the oil separator 5 can be communicated with the second port 21, and the third port 22 is communicated with the input end of the evaporator 8. And the first oil port 20 and the fourth oil port 23 are not communicated, so that a branch between the output end of the condenser 4 and the first oil port 20 is not communicated, and a branch between the fourth oil port 23 and the drying reservoir 10, the first input end 90, the first output end 91 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the second oil port 21, the third oil port 22, the evaporator 8, the second input port 92, the second output port 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 4) to form a defrosting circuit, and the transport refrigeration system 1 performs a defrosting mode.

Referring to fig. 1-4, in a preferred embodiment, transport refrigeration system 1 includes a Condenser inlet solenoid valve 11 (CIS), a thermostatic expansion valve 12, and a suction pressure regulating valve 13 (SPR), Condenser inlet solenoid valve 11 being connected between the output of oil separator 5 and the input of Condenser 4, thermostatic expansion valve 12 being connected between first output 91 and the input of evaporator 8, suction pressure regulating valve 13 being connected between the output of gas-liquid separator 7 and the input of compressor 6. In this embodiment, the condenser inlet solenoid valve 11 is used to control the communication or blocking between the oil separator 5 and the condenser 4, so as to communicate the output end of the condenser 4 with the first oil port 20 or communicate the output end of the oil separator 5 with the second oil port 21, thereby facilitating the switching of the transport refrigeration system among at least three working modes, i.e., a refrigeration mode, a refrigerant flushing mode, and a defrosting mode. The thermostatic expansion valve 12 controls the flow rate of the refrigerant entering the evaporator 8 by controlling the degree of superheat of the gaseous refrigerant at the outlet of the evaporator 8. The thermostatic expansion valve 12 realizes throttling from the condensing pressure to the evaporating pressure, controls the flow of the refrigerant at the same time, ensures the superheat degree of the refrigerant steam at the outlet of the evaporator 8 to be stable, and ensures that the evaporator 8 realizes the optimal and optimal liquid supply mode when the operating environment changes (such as the change of heat load). The suction pressure regulating valve 13 is an automatic valve provided between the outlet of the evaporator 8 and the inlet of the compressor 6, and regulates the flow rate of vapor according to the outlet pressure so as not to exceed a predetermined value of the suction pressure at the inlet of the compressor 6, and is a means for preventing an overload of a motor for driving the compressor 6. Therefore, the external control system is used for controlling the opening or closing of the condenser inlet electromagnetic valve 11, the thermostatic expansion valve 12 and the suction pressure regulating valve 13, so that the VP-mode transportation refrigeration system 1 can be switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode.

Fig. 5 is a schematic diagram illustrating a transport refrigeration system 1 according to another exemplary embodiment of the present disclosure. Referring to fig. 5, in the transport refrigeration system 1 exemplified by the SP (myself powered) mode, the first equipment group 30 includes the oil separator 5, the compressor 6, the gas-liquid separator 7, the second equipment group 31 includes the condenser 4, the third equipment group 32 includes the drying accumulator 10, and the fourth equipment group 33 includes the evaporator 8 and the heat exchanger 9. The output of oil content ware 5 is connected to first hydraulic fluid port 20, and the output of compressor 6 is connected to the input of oil content ware 5, and the output of vapour and liquid separator 7 is connected to the input of compressor 6, and the output of oil content ware 5 is connected to the input of condenser 4, and the output of condenser 4 is connected to second hydraulic fluid port 21, and the input of dry reservoir 10 is connected to third hydraulic fluid port 22. The heat exchanger 9 comprises a first input end 90, a first output end 91, a second input end 92 and a second output end 93, wherein the first input end 90 is connected with the output end of the drying liquid storage device 10, the first output end 91 is connected with the input end of the evaporator 8, the second input end 92 is connected with the output end of the evaporator 8, the second output end 93 is connected with the input end of the gas-liquid separator 7, and the fourth oil port 23 is connected with the input end of the evaporator 8. The transport refrigeration system 1 further comprises a check valve 14, the check valve 14 being connected between the fourth port 23 and the input of the drying accumulator 10. In this embodiment, the transport refrigeration system 1 is in SP mode, and compared with VP mode, a check valve 14 is added, where the check valve 14 is a device that fluid can only flow along the water inlet, but the medium at the water outlet cannot flow back, and is used to prevent the refrigerant from flowing backwards in the transport refrigeration system. In the SP mode, the connection relationship between the multiple refrigeration devices 3 and the check valve 14 can be changed by controlling the three-position four-way valve 2, so that the transportation refrigeration system 1 forms multiple different loops, and the transportation refrigeration system 1 in the SP mode is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode, so that the refrigerant circulation amount of the transportation refrigeration system 1 in the SP mode in the defrosting mode is increased, and the working efficiency of the whole machine is improved.

Fig. 6 is a schematic circuit diagram of the transport refrigeration system 1 provided herein in a refrigeration mode. Referring to fig. 6, when the transportation refrigeration system 1 is in the refrigeration mode, the second oil port 21 and the third oil port 22 are communicated, the output end of the condenser 4 is communicated with the second oil port 21, and the third oil port 22 is communicated with the input end of the drying reservoir 10, so that the compressor 6, the oil separator 5, the condenser 4, the second oil port 21, the third oil port 22, the drying reservoir 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a refrigeration loop. In this embodiment, the external control system controls the coil 27 at both ends of the spool rod 26 of the three-position four-way valve 2 to be de-energized, and the two pistons 25 are in the initial positions, i.e., the two pistons 25 do not move to either the left or the right. So, make second hydraulic fluid port 21 and third hydraulic fluid port 22 switch on, and then the output of condenser 4 can communicate second hydraulic fluid port 21 to and third hydraulic fluid port 22 communicates the input of dry reservoir 10. And the first oil port 20 and the fourth oil port 23 are not communicated, so that a branch between the output end of the oil separator 5 and the first oil port 20 is not communicated, and a branch between the fourth oil port 23 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the condenser 4, the second oil port 21, the third oil port 22, the drying accumulator 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 6) to form a refrigeration circuit, and a refrigeration mode is performed for the SP mode transport refrigeration system 1.

Fig. 7 is a schematic circuit diagram of the transport refrigeration system 1 according to the present application in the refrigerant flushing mode. Referring to fig. 7, when the transport refrigeration system 1 is in the refrigerant flushing mode, the second oil port 21 and the fourth oil port 23 are communicated, the output end of the condenser 4 is communicated with the second oil port 21, and the fourth oil port 23 is communicated with the input end of the evaporator 8, so that the compressor 6, the oil separator 5, the condenser 4, the second oil port 21, the fourth oil port 23, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a refrigerant flushing loop. In this embodiment, the external control system controls the coil 27 on the right side of the three-position four-way valve 2 to be powered on, so that the valve core rod 26 drives the two pistons 25 to move towards the right side, and thus the second oil port 21 and the fourth oil port 23 are conducted, and the output end of the condenser 4 can be communicated with the second oil port 21, and the fourth oil port 23 is communicated with the input end of the evaporator 8. And the first oil port 20 and the third oil port 22 are not communicated, so that a branch between the output end of the oil separator 5 and the first oil port 20 is not communicated, and a branch between the third oil port 22 and the drying reservoir 10, the first input end 90, the first output end 91 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the condenser 4, the second oil port 21, the fourth oil port 23, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 7) to form a refrigerant flushing loop, and a refrigerant flushing mode is performed for the SP mode transport refrigeration system 1.

Fig. 8 is a schematic diagram of an exemplary embodiment of a transport refrigeration system 1 provided herein in a defrost mode. Referring to fig. 8, when the transportation refrigeration system 1 is in the defrosting mode, the first oil port 20 and the fourth oil port 23 are connected, the output end of the oil separator 5 is communicated with the first oil port 20, and the fourth oil port 23 is communicated with the input end of the evaporator 8, so that the compressor 6, the oil separator 5, the first oil port 20, the fourth oil port 23, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a defrosting circuit. In this embodiment, the external control system controls the coil 27 on the left side of the three-position four-way valve 2 to be powered on, so that the valve core rod 26 drives the two pistons 25 to move to the left side, and thus the first oil port 20 and the fourth oil port 23 are conducted, and the output end of the oil separator 5 can be communicated with the first oil port 20, and the check valve 14 in this embodiment is in a closed state, so that the fourth oil port 23 is communicated with the input end of the evaporator 8. In addition, the second port 21 and the third port 22 are not communicated, so that a branch between the output end of the condenser 4 and the second port 21 is not communicated, and a branch between the third port 22 and the drying reservoir 10, the first input end 90, the first output end 91 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the first oil port 20, the fourth oil port 23, the evaporator 8, the second input port 92, the second output port 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 8) to form a defrosting circuit, and a defrosting mode is performed for the SP mode transport refrigeration system 1.

Fig. 9 is a schematic diagram of another exemplary embodiment of a transport refrigeration system 1 provided herein in a defrost mode. Referring to fig. 9, in some embodiments, when the transportation refrigeration system 1 is in the defrosting mode, the first oil port 20 and the fourth oil port 23 are connected, the output end of the oil separator 5 is connected to the first oil port 20, and the fourth oil port 23 is connected to the input end of the drying reservoir 10 through the check valve 14, so that the compressor 6, the oil separator 5, the first oil port 20, the fourth oil port 23, the drying reservoir 10, the first input end 90, the first output end 91, the evaporator 8, the second input end 92, the second output end 93, and the gas-liquid separator 7 form a defrosting circuit. The defrost circuit in this embodiment may also be formed by another branch. As shown in fig. 8, the coil 27 on the left side of the three-position four-way valve 2 is powered, so that the valve core rod 26 drives the two pistons 25 to move to the left side, and thus the first oil port 20 and the fourth oil port 23 are conducted, and the output end of the oil separator 5 can be communicated with the first oil port 20. Unlike the above-described fig. 8, in order to prevent the refrigerant from flowing in the reverse direction, the check valve 14 is opened so that the fourth port 23 can communicate with the check valve 14 and thus the input end of the drying accumulator 10. In addition, the second port 21 and the third port 22 are not communicated, so that a branch between the output end of the condenser 4 and the second port 21 is not communicated, a path between the third port 22 and the drying reservoir 10 is not communicated, and a branch between the fourth port 23 and the input end of the evaporator 8 is not communicated. In this way, the refrigerant circulates among the compressor 6, the oil separator 5, the first oil port 20, the fourth oil port 23, the drying accumulator 10, the first input port 90, the first output port 91, the evaporator 8, the second input port 92, the second output port 93, and the gas-liquid separator 7 in sequence (as shown by the direction of the arrow in fig. 9) to form a defrosting circuit, and a defrosting mode is performed for the SP mode transportation refrigeration system 1.

Referring to fig. 5-9, in some embodiments, the transport refrigeration system 1 includes a condenser inlet solenoid valve 11, a thermostatic expansion valve 12, and a suction pressure regulating valve 13, the condenser inlet solenoid valve 11 being connected between the output of the oil separator 5 and the input of the condenser 4, the thermostatic expansion valve 12 being connected between the first output 91 and the input of the evaporator 8, and the suction pressure regulating valve 13 being connected between the output of the gas-liquid separator 7 and the input of the compressor 6. In this embodiment, as in the transport refrigeration system 1 in the VP mode, the external control system is also used to control the on/off of the condenser inlet solenoid valve 11, the thermostatic expansion valve 12, and the suction pressure regulating valve 13, which is beneficial to switching the transport refrigeration system 1 in the SP mode among at least three operation modes, i.e., the cooling mode, the refrigerant flushing mode, and the defrosting mode.

The technical solutions disclosed in the embodiments of the present application can complement each other without generating conflicts.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (12)

1. A transportation refrigeration system is characterized by comprising a three-position four-way valve and a plurality of refrigeration devices, wherein the plurality of refrigeration devices comprise a first device group, a second device group, a third device group and a fourth device group, the three-position four-way valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is connected with the output end of the first device group, the second oil port is connected with the output end of the second device group, the third oil port is connected with the input end of the third device group, and the fourth oil port is connected with the input end of the fourth device group; the input end of the first equipment group is connected with the output end of the second equipment group, the input end of the second equipment group is connected with the output end of the third equipment group, and the input end of the third equipment group is also connected with the output end of the fourth equipment group; and

when the transportation refrigeration system works, one of the first oil port and the second oil port is communicated, and the other of the third oil port and the fourth oil port is communicated, so that the transportation refrigeration system is switched among at least three working modes, namely a refrigeration mode, a refrigerant flushing mode and a defrosting mode.

2. The transport refrigeration system of claim 1, wherein the first equipment group includes a condenser, the second equipment group includes an oil separator, a compressor, and a gas-liquid separator, the third equipment group includes an evaporator and a heat exchanger, and the fourth equipment group includes a drying accumulator;

the input end of the condenser is connected with the output end of the oil separator, the input end of the oil separator is connected with the output end of the compressor, and the input end of the compressor is connected with the output end of the gas-liquid separator;

the heat exchanger comprises a first input end, a first output end, a second input end and a second output end, the output end of the drying liquid storage device is connected with the first input end, the first output end is connected with the input end of the evaporator, the output end of the evaporator is connected with the second input end, and the second output end is connected with the input end of the gas-liquid separator;

the first oil port is connected with the output end of the condenser, the second oil port is connected with the output end of the oil separator, the third oil port is connected with the input end of the evaporator, and the fourth oil port is connected with the input end of the drying liquid storage device.

3. The transport refrigeration system of claim 2, wherein when the transport refrigeration system is in the refrigeration mode, the first oil port and the fourth oil port are in communication, the output end of the condenser is communicated with the first oil port, and the fourth oil port is communicated with the input end of the drying reservoir, such that the compressor, the oil separator, the condenser, the first oil port, the fourth oil port, the drying reservoir, the first input end, the first output end, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigeration loop.

4. The transport refrigeration system according to claim 2, wherein when the transport refrigeration system is in the refrigerant flushing mode, the second oil port and the fourth oil port are communicated, an output end of the oil separator is communicated with the second oil port, and the fourth oil port is communicated with an input end of the drying reservoir, so that the compressor, the oil separator, the second oil port, the fourth oil port, the drying reservoir, the first input end, the first output end, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigerant flushing loop.

5. The transport refrigeration system of claim 2, wherein when the transport refrigeration system is in the defrost mode, the second oil port and the third oil port are open, the output end of the oil separator is communicated with the second oil port, and the third oil port is communicated with the input end of the evaporator, such that the compressor, the oil separator, the second oil port, the third oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a defrost circuit.

6. A transport refrigeration system as recited in any of claims 2-5 including a condenser inlet solenoid valve connected between the output of the oil separator and the input of the condenser, a thermal expansion valve connected between the first output and the input of the evaporator, and a suction pressure regulating valve connected between the output of the gas-liquid separator and the input of the compressor.

7. The transport refrigeration system of claim 1, wherein the first equipment group includes an oil separator, a compressor, a gas-liquid separator, the second equipment group includes a condenser, the third equipment group includes a drying accumulator, and the fourth equipment group includes an evaporator and a heat exchanger;

the first oil port is connected with the output end of the oil separator, the input end of the oil separator is connected with the output end of the compressor, the input end of the compressor is connected with the output end of the gas-liquid separator, the input end of the condenser is connected with the output end of the oil separator, the second oil port is connected with the output end of the condenser, and the third oil port is connected with the input end of the drying liquid storage device;

the heat exchanger comprises a first input end, a first output end, a second input end and a second output end, wherein the first input end is connected with the output end of the drying liquid storage device, the first output end is connected with the input end of the evaporator, the second input end is connected with the output end of the evaporator, the second output end is connected with the input end of the gas-liquid separator, and the fourth oil port is connected with the input end of the evaporator;

the transportation refrigeration system comprises a one-way valve, and the one-way valve is connected between the fourth oil port and the input end of the drying liquid storage device.

8. The transport refrigeration system of claim 7, wherein when the transport refrigeration system is in the refrigeration mode, the second oil port and the third oil port are in communication, the output end of the condenser is in communication with the second oil port, and the third oil port is in communication with the input end of the drying reservoir, such that the compressor, the oil separator, the condenser, the second oil port, the third oil port, the drying reservoir, the first input end, the first output end, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigeration loop.

9. The transport refrigeration system of claim 7, wherein when the transport refrigeration system is in the refrigerant flushing mode, the second oil port and the fourth oil port are communicated, the output end of the condenser is communicated with the second oil port, and the fourth oil port is communicated with the input end of the evaporator, so that the compressor, the oil separator, the condenser, the second oil port, the fourth oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a refrigerant flushing loop.

10. The transportation refrigeration system according to claim 7, wherein when the transportation refrigeration system is in the defrosting mode, the first oil port and the fourth oil port are communicated, an output end of the oil separator is communicated with the first oil port, and the fourth oil port is communicated with an input end of the evaporator, so that the compressor, the oil separator, the first oil port, the fourth oil port, the evaporator, the second input end, the second output end, and the gas-liquid separator form a defrosting loop; or

The transportation refrigeration system is in when the defrosting mode, first hydraulic fluid port with the fourth hydraulic fluid port switches on, the output intercommunication of oil content ware the first hydraulic fluid port, the fourth hydraulic fluid port passes through the check valve intercommunication the input of dry reservoir makes the compressor, the oil content ware the first hydraulic fluid port the fourth hydraulic fluid port the dry reservoir the first input, the first output the evaporimeter, the second input the second output, vapour and liquid separator forms the defrosting return circuit.

11. A transport refrigeration system as recited in any of claims 7-10 including a condenser inlet solenoid valve connected between the output of the oil separator and the input of the condenser, a thermal expansion valve connected between the first output and the input of the evaporator, and a suction pressure regulating valve connected between the output of the gas-liquid separator and the input of the compressor.

12. The transport refrigeration system of claim 1, wherein the three-position four-way valve includes a cavity, at least two pistons disposed in the cavity, a valve core rod traversing the cavity and connected in series with the at least two pistons, and at least two coils fixed to two ends of the valve core rod, respectively;

the first oil port is fixed on one side of the cavity, the second oil port, the third oil port and the fourth oil port are fixed on one side of the cavity side by side and opposite to the first oil port, and the conduction states of the first oil port, the second oil port, the third oil port and the fourth oil port are adjusted through at least two pistons, the valve core rod and at least two coils in movable fit with each other.

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