Heat exchange systems and electrical equipment

Abstract

The present invention relates to the field of heat exchange technology, and provides a heat exchange system and electrical equipment. The heat exchange system includes: a refrigerant circulation loop, on which a compressor, a condenser, a subcooler and an evaporator are provided; a heat exchange pipeline, in which a heat exchange medium flows; and a subcooler and a condenser are arranged in sequence along the flow direction of the heat exchange medium to perform staged heating on the heat exchange medium. According to the heat exchange system of an embodiment of the present invention, since a subcooler is provided in the refrigerant circulation loop, that is, the refrigerant will enter the subcooler after flowing out of the condenser, the subcooling degree of the refrigerant at the outlet of the condenser can be increased, thereby improving the heat exchange energy efficiency of the condenser. In addition, since the subcooler and the condenser are arranged on the flow path of the heat exchange pipeline, when the heat exchange medium flows through the subcooler and the condenser in sequence, the heat exchange medium can be heated in stages, thereby improving the heat exchange efficiency of the heat exchange system, and recovering the heat outside the condenser, thereby improving energy utilization.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, in particular to a heat exchange system and electrical equipment. Background Art

[0002] Refrigerant circulation loops are widely used in electrical equipment with heat exchange systems, such as air conditioners and heat pump dryers. These loops consist of a compressor, condenser, throttling element, and evaporator. The basic operating principle is as follows: the refrigerant is filled with refrigerant, which is compressed by the compressor into a high-temperature, high-pressure gas. This gas is then condensed by the condenser into a high-pressure liquid. This liquid is then throttled by the throttling element into a low-temperature, low-pressure liquid. The evaporator absorbs heat, raising its temperature to a low-pressure gas before finally entering the compressor's intake port. Currently, heat exchange systems suffer from low energy efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat exchange system that can improve system energy consumption and reduce energy waste.

[0004] The present invention also provides an electrical device.

[0005] A heat exchange system according to a first embodiment of the present invention includes:

[0006] A refrigerant circulation loop, wherein the refrigerant circulation loop is provided with a compressor, a condenser, a subcooler and an evaporator;

[0007] Heat exchange pipeline, with heat exchange medium flowing;

[0008] The subcooler and the condenser are sequentially arranged along the flow direction of the heat exchange medium to heat the heat exchange medium in stages.

[0009] According to the heat exchange system of an embodiment of the present invention, since a subcooler is provided in the refrigerant circulation loop, that is, the refrigerant enters the subcooler after flowing out of the condenser, thereby increasing the subcooling degree of the refrigerant at the condenser outlet and improving the heat exchange efficiency of the condenser. In addition, since the subcooler and condenser are arranged on the flow path of the heat exchange pipeline, when the heat exchange medium flows through the subcooler and condenser in sequence, the heat exchange medium can be heated in stages, thereby improving the heat exchange efficiency of the heat exchange system, and recovering the heat outside the condenser, thereby improving energy utilization.

[0010] According to one embodiment of the present invention, the condenser includes a first condenser and a second condenser, the condensation temperature of the first condenser is higher than the condensation temperature of the second condenser, and the heat exchange medium flows through the second condenser and the first condenser in sequence.

[0011] According to one embodiment of the present invention, at least one of the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the evaporator through the subcooler.

[0012] According to one embodiment of the present invention, the heat exchange pipeline is a heat exchange air circuit, the heat exchange medium is a heat exchange gas, and the heat exchange air circuit is connected to the evaporator, the subcooler, the second condenser and the first condenser in sequence, so that the heat exchange gas flows through the evaporator, the subcooler, the second condenser and the first condenser in sequence.

[0013] According to one embodiment of the present invention, the evaporator includes a first evaporation tube section and a second evaporation tube section arranged in parallel, and the evaporation tube section is located above the second evaporation tube section.

[0014] According to one embodiment of the present invention, the refrigerant outlet of the first condenser is connected to the refrigerant inlet of the subcooler, the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the first evaporation tube section through a first throttling element, and the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the second evaporation tube section through a second throttling element, or,

[0015] The first condenser is connected to the refrigerant inlet of the first evaporation tube section via a first throttling element, the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the subcooler, and the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the second evaporation tube section via a second throttling element, or,

[0016] The refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the two refrigerant inlets of the subcooler, and the two refrigerant outlets of the subcooler are respectively connected to the refrigerant inlet of the first evaporator tube section and the refrigerant inlet of the second evaporator tube section through the first throttling element and the second throttling element.

[0017] According to one embodiment of the present invention, the refrigerant outlet of the first condenser is connected to the refrigerant inlet of the subcooler, and the refrigerant outlet of the subcooler and the refrigerant outlet of the second condenser are connected to the refrigerant inlet of the manifold section through a first throttling element and a second throttling element respectively; the first refrigerant outlet of the manifold section is connected to the refrigerant inlet of the first evaporation section, and the second refrigerant outlet of the manifold section is connected to the refrigerant inlet of the second evaporation section, or,

[0018] The refrigerant outlet of the second condenser is connected to the refrigerant inlet of the subcooler, and the refrigerant outlet of the first condenser and the refrigerant outlet of the subcooler are connected to the refrigerant inlet of the busbar segment through a first throttling element and a second throttling element respectively; the first refrigerant outlet of the busbar segment is connected to the refrigerant inlet of the first evaporation segment, and the second refrigerant outlet of the busbar segment is connected to the refrigerant inlet of the second evaporation segment, or,

[0019] The refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the two refrigerant inlets of the subcooler, and the two refrigerant outlets of the subcooler are respectively connected to the refrigerant inlet of the busbar section through the first throttling element and the second throttling element; the first refrigerant outlet of the busbar section is connected to the refrigerant inlet of the first evaporator section, and the second refrigerant outlet of the busbar section is connected to the refrigerant inlet of the second evaporator section.

[0020] According to one embodiment of the present invention, the compressor has a first air intake port and a second air intake port, the refrigerant outlet of the first evaporation pipe section is connected to the first air intake port, and the refrigerant outlet of the second evaporation pipe section is connected to the second air intake port.

[0021] According to one embodiment of the present invention, the evaporator includes a first evaporator and a second evaporator, and along the flow direction of the heat exchange medium, the first evaporator is located upstream of the second evaporator;

[0022] The refrigerant outlet of the first condenser is connected to the refrigerant inlet of the subcooler, the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the first evaporator through a first throttling element, and the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the second evaporator through a second throttling element, or,

[0023] The refrigerant outlet of the first condenser is connected to the refrigerant inlet of the first evaporator through a first throttling element, the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the subcooler, and the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the second evaporator through a second throttling element, or,

[0024] The refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the two refrigerant inlets of the subcooler, and the two refrigerant outlets of the subcooler are respectively connected to the first evaporator and the second evaporator through the first throttling element and the second throttling element.

[0025] According to one embodiment of the present invention, the compressor has a first air intake port and a second air intake port, the refrigerant outlet of the first evaporator is connected to the first air intake port, and the refrigerant outlet of the second evaporator is connected to the second air intake port.

[0026] According to one embodiment of the present invention, the compressor has a first exhaust port and a second exhaust port, the first exhaust port is connected to the refrigerant inlet of the first condenser, and the second exhaust port is connected to the refrigerant inlet of the second condenser.

[0027] According to one embodiment of the present invention, the heat exchange pipeline is a water exchange pipeline, and the heat exchange medium is water.

[0028] An electrical device according to an embodiment of the second aspect of the present invention includes the above-mentioned heat exchange system.

[0029] The electrical device according to the embodiment of the present invention has all the technical features of the above-mentioned heat exchange system, and therefore has all the technical effects of the above-mentioned heat exchange system, which will not be described in detail here.

[0030] According to an embodiment of the third aspect of the present invention, the electrical equipment includes the above-mentioned heat exchange system, and the electrical equipment is a heat pump dryer. The heat pump dryer includes a drying drum, which is arranged in the heat exchange air path and is arranged downstream of the second condenser along the flow direction of the heat exchange gas.

[0031] The electrical device according to the embodiment of the present invention has all the technical features of the above-mentioned heat exchange system, and therefore has all the technical effects of the above-mentioned heat exchange system, which will not be described in detail here.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the compressor has an air intake port;

[0035] Figure 2 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the compressor has an air intake port;

[0036] Figure 3is a structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the compressor has two air intake ports;

[0037] Figure 4 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the compressor has two air intake ports;

[0038] Figure 5 1 is a schematic structural diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the refrigerant merges before entering the evaporator;

[0039] Figure 6 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporation tube section and a second evaporation tube section, and the refrigerant merges before entering the evaporator;

[0040] Figure 7 1 is a schematic structural diagram of a heat exchange system provided by an embodiment of the present invention, wherein the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the cooler;

[0041] Figure 8 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the cooler;

[0042] Figure 9 1 is a schematic structural diagram of a heat exchange system provided by an embodiment of the present invention, wherein the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the refrigerant inlet of the cooler;

[0043] Figure 10 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the refrigerant inlet of the cooler;

[0044] Figure 11 1 is a schematic structural diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporator tube and a second evaporator tube;

[0045] Figure 12 is another structural schematic diagram of a heat exchange system provided by an embodiment of the present invention, wherein the evaporator includes a first evaporator tube and a second evaporator tube;

[0046] Reference numerals:

[0047] 1. Compressor; 2. First condenser; 3. Subcooler; 4. First throttling element; 5. Second condenser; 6. Second throttling element; 7. Evaporator; 701. First evaporator; 702. Second evaporator. DETAILED DESCRIPTION

[0048] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0049] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0050] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0051] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0053] See Figures 1 to 12 A heat exchange system according to an embodiment of the present invention includes a refrigerant circulation loop and heat exchange piping. The refrigerant circulation loop includes a compressor 1, a condenser, a subcooler 3, and an evaporator 7. Heat exchange medium flows through the heat exchange piping. Subcooler 3 and the condenser are sequentially arranged along the flow direction of the heat exchange medium to provide staged heating of the heat exchange medium.

[0054] According to the heat exchange system of an embodiment of the present invention, since a subcooler 3 is provided in the refrigerant circulation loop, that is, the refrigerant will enter the subcooler 3 after flowing out of the condenser, thereby increasing the subcooling degree of the refrigerant at the condenser outlet and improving the heat exchange efficiency of the condenser. In addition, since the subcooler 3 and the condenser are arranged on the flow path of the heat exchange pipeline, when the heat exchange medium flows through the subcooler 3 and the condenser in sequence, the heat exchange medium can be heated in stages, thereby improving the heat exchange efficiency of the heat exchange system, and recovering the heat outside the condenser, thereby improving energy utilization.

[0055] Among them, since the refrigerant in the subcooler 3 is cooled by the external heat exchange medium instead of being cooled in a natural environment, a higher refrigerant subcooling degree can be ensured, thereby improving the energy efficiency of the heat exchange system.

[0056] According to an embodiment of the present invention, in a direct-heat heat pump water heater, the temperature span to be frozen or heated is often very large. For example, water needs to be heated from 15 degrees Celsius to 50 degrees Celsius. However, a single condenser has only one condensing pressure. This means that the entire direct-heat heat pump water heater's heat exchange system operates at a higher condensing temperature, resulting in lower energy efficiency of the heat exchange system. Based on this, in addition to using a single condenser, the heat exchange system in the embodiment of the invention can also be provided with multiple condensers.

[0057] See Figure 1 and Figure 12In one embodiment, the condenser includes a first condenser 2 and a second condenser 5. The condensation temperature of the first condenser 2 is higher than that of the second condenser 5. The heat exchange medium flows through the second condenser 5 and the first condenser 2 in sequence. The refrigerant outlet of the first condenser 2 is connected to the refrigerant inlet of the subcooler 3, and the refrigerant outlet of the subcooler 3 and the refrigerant outlet of the second condenser 5 are connected to the refrigerant inlet of the evaporator 7. In this case, since there are two condensers and the heat exchange medium in the heat exchange pipeline passes through the second condenser 5 and the first condenser 2 in sequence, it means that the heat exchange medium undergoes at least three stages of heating along its flow path (i.e., heating in the subcooler 3, heating in the second condenser 5, and heating in the first condenser 2). This step-by-step heating method can ensure that the heat exchange system has high energy efficiency, while fully heating the heat exchange medium and reducing energy waste.

[0058] According to an embodiment of the present invention, the heat exchange pipeline is a heat exchange air circuit, and the heat exchange medium is a heat exchange gas. The heat exchange air circuit sequentially connects the evaporator 7, the subcooler 3, the second condenser 5, and the first condenser 2, so that the heat exchange gas flows through the evaporator 7, the subcooler 3, the second condenser 5, and the first condenser 2. In this case, the heat exchange gas is dried and dehumidified by the evaporator 7 before passing through the subcooler 3. Therefore, this heat exchange system can be applied to heat pump dryers or other applications requiring drying of the heat exchange medium.

[0059] Figures 1 to 12 In the figure, the flow direction of the hollow arrow refers to the flow direction of the heat exchange medium, and the flow direction of the other arrow refers to the flow direction of the refrigerant.

[0060] See Figures 1 to 6 The evaporator 7 includes a first evaporation tube section and a second evaporation tube section arranged in parallel, with the first evaporation tube section located above the second evaporation tube section. In this case, the evaporator 7 is divided into two parts, upper and lower, with different cooling capacities. When the heat exchange gas flows through the evaporator 7, some of the liquid carried by the heat exchange gas is cooled and adheres to the evaporator 7.

[0061] Taking air as an example, when moist air flows through the evaporator 7, the liquid carried by the air adheres to the evaporator 7, thereby achieving the purpose of drying the air. At the same time, because the liquid adheres to the evaporator 7, the liquid will flow from top to bottom along the evaporator 7. Furthermore, for the evaporator 7, the thickness of the water film outside the second evaporation tube in the lower half of the evaporator 7 is greater than the thickness of the water film outside the first evaporator 701 in the upper half of the evaporator 7, which results in the second evaporation tube requiring a greater cooling capacity than the first evaporation tube. Based on this, the embodiment of the present invention distributes the refrigerant entering the evaporator 7 so that a portion of the refrigerant enters the first evaporation tube section and another portion of the refrigerant enters the second evaporation tube section. Furthermore, it is ensured that the refrigerant entering the second evaporation tube section has a stronger evaporation absorption potential than the refrigerant entering the first evaporation tube section.

[0062] According to an embodiment of the present invention, at least one of the refrigerant outlet of the first condenser 2 and the refrigerant outlet of the second condenser 5 is connected to the refrigerant inlet of the evaporator 7 through the subcooler 3. For example, Figures 1 to 6 In the embodiment, the refrigerant outlet of the first condenser 2 is connected to the refrigerant inlet of the cooler 3; Figure 7 and Figure 8 In the embodiment, the refrigerant outlet of the second condenser 5 is connected to the refrigerant inlet of the cooler 3; Figure 9 and Figure 10 In the embodiment, the refrigerant outlets of the first condenser 2 and the second condenser 5 are connected to the two refrigerant inlets of the cooler 3 respectively.

[0063] In one embodiment, see Figures 1 to 4 The refrigerant outlet of the subcooler 3 is connected to the refrigerant inlet of the first evaporator section through the first throttling element 4, and the refrigerant outlet of the second condenser 5 is connected to the refrigerant inlet of the second evaporator section through the second throttling element 6. In this case, i.e., in the heat exchange system, the refrigerant flowing through the first condenser 2 flows sequentially through the subcooler 3, the first throttling element 4, and the first evaporator section; the refrigerant flowing through the second condenser 5 flows sequentially through the second throttling element 6 and the second evaporator section. Because the refrigerant flowing out of the first condenser 2 generally has a higher gaseous component and, therefore, a lower potential for evaporation and heat absorption, this portion of the refrigerant is directed to the first evaporator section. Of course, in actual operation, the size of the first condenser 2 and the second condenser 5 may limit the refrigerant flowing out of the first condenser 2 to have a lower gaseous component than that of the refrigerant flowing out of the second condenser 5. In this case, the refrigerant flowing out of the first condenser 2 can also be directed to the second evaporator section.

[0064] In one embodiment, see Figure 5 and Figure 6The refrigerant outlet of the subcooler 3 and the refrigerant outlet of the second condenser 5 are connected to the refrigerant inlet of the converging pipe section through the first throttling element 4 and the second throttling element 6, respectively. The first refrigerant outlet of the converging pipe section is connected to the refrigerant inlet of the first evaporating pipe section, and the second refrigerant outlet of the converging pipe section is connected to the refrigerant inlet of the second evaporating pipe section. In this case, the refrigerant flowing out of the first condenser 2 and the second condenser 5 is first merged before entering the evaporator 7. Based on this, all the refrigerant is distributed according to demand, thereby ensuring that the refrigerant flow in the first and second evaporating pipe sections of the evaporator 7 meets the demand.

[0065] In one embodiment, see Figure 7 and Figure 8 The second condenser 5 is connected to the second throttling element 6 through the subcooler 3, and the second throttling element 6 is connected to the second evaporation tube section; the first condenser 2 is connected to the first evaporation tube section through the first throttling element 4. In this case, the second condenser 5, which has a lower condensing temperature, is further subcooled by the subcooler 3, thereby ensuring that the refrigerant entering the second evaporation tube section has a stronger evaporation absorption potential.

[0066] In one embodiment, see Figure 9 and Figure 10 The second condenser 5 is connected to the second throttling element 6 through the subcooler 3, and the second throttling element 6 is connected to the first evaporation tube section; the first condenser 2 is connected to the second evaporation tube section through the first throttling element 4. In this case, the evaporation absorption potential of the refrigerant flowing out of the first condenser 2 and the second condenser 5 is increased, thereby maximizing the heat exchange efficiency of the heat exchange system.

[0067] See Figure 11 and Figure 12The evaporator 7 includes a first evaporator 701 and a second evaporator 702. In the direction of heat exchange medium flow, the first evaporator 701 is located upstream of the second evaporator 702. The refrigerant outlet of the subcooler 3 is connected to the refrigerant inlet of the first evaporator 701 via a first throttling element 4, and the refrigerant outlet of the second condenser 5 is connected to the refrigerant inlet of the second evaporator 702 via a second throttling element 6. The refrigerant flowing through the first condenser 2 has a higher temperature and pressure than the refrigerant flowing through the second condenser 5. The refrigerant flowing through the first condenser 2 is then passed into the first evaporator 701 on the windward side; in addition, the refrigerant flowing through the second condenser 5 is passed into the second evaporator 702 on the leeward side. The temperature outside the first evaporator 701 is higher than that outside the second evaporator 702. Passing the higher-temperature refrigerant into the first evaporator 701 and the lower-temperature refrigerant into the second evaporator 702 clearly better meets the cooling demand. Taking the heat exchange system in the heat pump dryer mentioned later as an example, the high-temperature and high-humidity gas flows from the drying drum to the first evaporator 701, and then flows through the second evaporator 702. The second evaporator 702 has a stronger cooling capacity than the first evaporator 701, thereby ensuring that the gas is cooled and dried step by step before being heated.

[0068] According to the embodiment of the present invention, no matter whether the evaporator 7 includes the first evaporation pipe section and the second evaporation pipe section, or includes the first evaporator 701 and the second evaporator 702 , the air intake of the compressor 1 has at least two situations.

[0069] Take the case where the evaporator 7 includes the first evaporation tube section and the second evaporation tube section as an example: Figure 1 and Figure 2 The refrigerant outlet of the first evaporation pipe section and the refrigerant outlet of the second evaporation pipe section are connected to the suction port of the compressor 1 through a common pipe section; or, refer to Figure 3 and Figure 4 The compressor 1 has a first air intake port and a second air intake port. The refrigerant outlet of the first evaporation pipe section is connected to the first air intake port, and the refrigerant outlet of the second evaporation pipe section is connected to the second air intake port.

[0070] Similarly, when the evaporator 7 includes a first evaporator 701 and a second evaporator 702: the refrigerant outlet of the first evaporator 701 and the refrigerant outlet of the second evaporator 702 are connected to the air intake of the compressor 1 through a common pipe section; or, the compressor 1 has a first air intake and a second air intake, the refrigerant outlet of the first evaporator 701 is connected to the first air intake, and the refrigerant outlet of the second evaporator 702 is connected to the second air intake.

[0071] According to the heat exchange system of the embodiment of the present invention, the compressor 1 is provided with one air intake port, which can simplify the structure of the compressor 1 and reduce the preparation cost of the heat exchange system.

[0072] Figure 3 and Figure 4 In the embodiment, there are two air intakes. In this case, the entire heat exchange system is provided with a high-pressure circuit and a low-pressure circuit. Specifically, the high-pressure exhaust port of the compressor 1 (also referred to as the first exhaust port below) is connected to the high-temperature condenser (also referred to as the first condenser 2), the high-temperature condenser is connected to the high-temperature evaporation pipe section (also referred to as the first evaporation pipe section above the evaporator 7), and the refrigerant outlet of the high-temperature evaporation pipe section is connected to the first air intake port of the compressor 1. After compression, this part of the refrigerant enters the high-temperature condenser again through the high-pressure exhaust port to form a cycle. In addition, the low-pressure exhaust port of the compressor 1 (also referred to as the second exhaust port below) is connected to the medium-temperature condenser (also referred to as the second condenser 5), the medium-temperature condenser is connected to the low-temperature evaporation pipe section (also referred to as the second evaporation pipe section below the evaporator 7), and the refrigerant outlet of the low-temperature evaporation pipe section is connected to the second air intake port of the compressor 1. After compression, this part of the refrigerant enters the medium-temperature condenser again through the low-pressure exhaust port (also referred to as the second exhaust port) to form a cycle. In this case, by providing a high-pressure circuit and a low-pressure circuit, the pressure ratio of the compressor 1 can be reduced, thereby further improving the energy efficiency of the heat exchange system and reducing its energy consumption.

[0073] Of course, in the case where the heat exchange system is provided with two evaporators, two air intakes can also be provided for the compressor, so that the entire heat exchange system is provided with a high-pressure circuit and a low-pressure circuit, so as to achieve the purpose of improving energy efficiency and reducing energy consumption. In one embodiment, the high-pressure exhaust port of the compressor 1 is connected to the high-temperature condenser, the high-temperature condenser is connected to the high-temperature evaporator (i.e., the first evaporator 701), and the refrigerant outlet of the high-temperature evaporator is connected to the first air intake port of the compressor 1. After compression, this part of the refrigerant enters the high-temperature condenser again through the high-pressure exhaust port to form a cycle. In addition, the low-pressure exhaust port of the compressor 1 is connected to the medium-temperature condenser, the medium-temperature condenser is connected to the low-temperature evaporator (i.e., the second evaporator 702), and the refrigerant outlet of the low-temperature evaporator is connected to the second air intake port of the compressor 1. After compression, this part of the refrigerant enters the medium-temperature condenser again through the low-pressure exhaust port to form a cycle. In another embodiment, the high-temperature condenser is connected to the high-temperature evaporator (i.e., the first evaporator 701), and the refrigerant outlet of the high-temperature evaporator is connected to the first air intake of the compressor 1. The medium-temperature condenser is connected to the low-temperature evaporator (i.e., the second evaporator 702), and the refrigerant outlet of the low-temperature evaporator is connected to the second air intake of the compressor 1. Furthermore, the refrigerant returns to the compressor from the first and second air intakes, where it is mixed. It is then connected to the high-temperature condenser through the high-pressure exhaust port of the compressor 1 and to the medium-temperature condenser through the low-pressure exhaust port of the compressor 1.

[0074] According to an embodiment of the present invention, a heat exchange system with a single exhaust compressor 1 generally has a relatively low operating efficiency. Based on this, the heat exchange system of an embodiment of the present invention adopts a dual exhaust compressor 1. Specifically, the compressor 1 has a first exhaust port and a second exhaust port. The first exhaust port is connected to the refrigerant inlet of the first condenser 2, and the second exhaust port is connected to the refrigerant inlet of the second condenser 5. As a result, the compressor 1 can discharge refrigerants with different condensation pressures through the first exhaust port and the second exhaust port, thereby achieving different condensation temperatures for the first condenser 2 and the second condenser 5. Then, when the heat exchange medium passes through the second condenser 5 and the first condenser 2 in sequence, step heating can be achieved, thereby improving the energy efficiency of the heat exchange system. Among them, the first condenser 2 is a high-temperature condenser, and the second condenser 5 is a medium-temperature condenser. Here, "high temperature" and "medium temperature" are relative concepts. Corresponding to the first condenser 2 with a higher condensation temperature, in order to increase the supercooling of the refrigerant flowing out of the first condenser 2, the refrigerant outlet of the first condenser 2 is connected to the refrigerant inlet of the subcooler 3. The refrigerant flowing out of the first condenser 2 passes through the subcooler 3, and the subcooling degree of the refrigerant increases, thereby reducing the proportion of gaseous refrigerant flowing into the evaporator 7, thereby increasing the ability to vaporize and absorb heat.

[0075] According to an embodiment of the present invention, the heat exchange pipeline is a water exchange circuit, and the heat exchange medium is water. In this case, the water is heated in stages through the refrigerant circulation loop. Since water generally does not need to be dried, it can typically flow sequentially through the cooler 3 and condenser, without passing through the evaporator 7.

[0076] According to an embodiment of the present invention, a power source, such as a fan, a water pump, etc., may be provided in the heat exchange pipeline to ensure that the heat exchange medium can flow along the heat exchange pipeline.

[0077] According to an embodiment of the present invention, the throttling element (at least one of the first throttling element 4 and the second throttling element 6) can be in the form of a capillary tube, an electronic expansion valve, a thermal expansion valve, etc., and is not specifically limited to the examples given here.

[0078] According to an embodiment of the present invention, the heat exchange pipeline is applied to the drying scene of the air circuit closed cycle as an example, where the heat exchange medium is air. Figure 4 The temperature of the air before heat exchange with the evaporator 7 is T1, the temperature of the air after heat exchange with the evaporator 7 is T2, the temperature of the air after heat exchange with the subcooler 3 is T3, the temperature of the air after heat exchange with the second condenser 5 is T4, and the temperature of the air after heat exchange with the first condenser 2 is T5. In one embodiment, the relationship between T1, T2, T3, T4 and T5 satisfies: T2 = T1-(5°C to 25°C), T3 = T2+(10°C to 25°C), T4 = T3+(10°C to 20°C), and T5 = T4+(10°C to 15°C).

[0079] According to a second embodiment of the present invention, there is provided an electrical device, further comprising the above-mentioned heat exchange system.

[0080] The electrical appliances may be refrigerators, freezers, air conditioners, and other refrigeration equipment, as well as dryers, washing machines, heat pump water heaters, heat pump clothes dryers, or heat pump dishwashers. Of course, the electrical appliances may also be other devices that require a heat exchange system, which are not listed here one by one.

[0081] When the electrical appliance is a refrigerator, freezer, air conditioner, or other refrigeration equipment, the heat exchange system may not have a connected heat exchange air path. When the electrical appliance is a dryer, washing machine, or heat pump dryer, the heat exchange system generally has a connected heat exchange air path, and the heat exchange circuit is often a relatively closed airflow circuit.

[0082] According to an embodiment of the present invention, a heat pump dryer is used as an example to briefly describe an electrical device. The heat pump dryer includes a drying drum, which is arranged in the heat exchange air path and downstream of the second condenser 5 along the flow direction of the heat exchange gas.

[0083] In one embodiment, the heat pump dryer adopts the heat exchange system mentioned above, and the compressor 1 has two exhaust structures, and the first condenser 2 and the second condenser 5 are respectively provided corresponding to the two exhaust structures, so that the gas in the heat exchange air path can be heated in sections, thereby realizing the separate throttling of the first refrigerant circulation loop and the second refrigerant circulation loop, thereby shortening the drying time.

[0084] Similarly, when the electrical equipment is other products, the working efficiency of the electrical equipment can also be increased by adopting a double exhaust compressor 1 and a two-stage condenser.

[0085] According to an embodiment of the present invention, the heat pump clothes dryer includes a drying drum, which is disposed in the heat exchange air path and, along the airflow direction, is located downstream of the second condenser 5. Furthermore, along the heat exchange air path, the airflow passes through the evaporator 7, the subcooler 3, the first condenser 2, the second condenser 5, and the drying drum in sequence.

[0086] The heat exchange principle of the heat exchange air path of the heat pump dryer is roughly as follows: in the heat exchange air path, the gas in the drying drum exchanges heat with the clothes, taking away the moisture in the clothes to obtain high-temperature and high-humidity gas; the high-temperature and high-humidity gas flows from the drying drum to the evaporator 7, and the high-temperature and high-humidity gas condenses and exchanges heat on the outer surface of the evaporator 7 to obtain low-temperature dry gas; the low-temperature dry gas flows from the evaporator 7 to the supercooler 3, is preliminarily heated by the supercooler 3, and then flows to the condenser, is heated outside the condenser, and obtains high-temperature dry gas; the high-temperature dry gas flows back from the condenser to the drying drum and exchanges heat with the clothes to realize air circulation.

[0087] In the refrigerant circulation loop, the low-temperature, low-pressure gaseous refrigerant in the compressor 1 becomes a high-temperature, high-pressure gaseous refrigerant; the high-temperature, high-pressure gaseous refrigerant undergoes a phase change (liquefaction) when flowing through the condenser, releasing heat, heating the gas outside the condenser, and the refrigerant in the condenser becomes a medium-temperature, medium-pressure liquid refrigerant; the medium-temperature, medium-pressure liquid refrigerant enters the evaporator 7 after throttling and reducing the pressure by flowing through the second throttling element 6 (such as a capillary tube); the refrigerant vaporizes and diffuses in the evaporator 7 while absorbing heat from the air outside the evaporator 7 to become a low-temperature, low-pressure gaseous refrigerant. After the low-temperature, low-pressure gaseous refrigerant is sucked into the compressor 1, it undergoes the aforementioned process again to form a refrigeration cycle. Among them, some refrigerant flows out of the condenser and enters the subcooler 3, and then enters the evaporator 7 after being subcooled in the subcooler 3.

[0088] According to an embodiment of the present invention, the heat pump dryer has different drying modes, such as low-temperature drying, fast drying, energy-saving drying, etc., and the step heating function of the first condenser 2 and the second condenser 5 in the double-exhaust drying system has a more prominent energy-saving advantage when the condensing temperature requirement is high. When the condensing temperature requirement is not high, the energy-saving effect of the heat exchange system can be improved by adopting the above-mentioned first evaporation pipe section and the second evaporation pipe section.

[0089] For example, in the fast drying mode: in order to increase the air temperature at the condenser air inlet, if the heat exchanger area is sufficient, the refrigerant flow or air volume of the first evaporation pipe section is controlled to achieve different air flow temperatures between the first evaporation pipe section and the second evaporation pipe section. Figure 6 For example, the air flow coming out of the drying drum of the heat pump dryer exchanges heat in the upper and lower parts of the evaporator 7 respectively (that is, exchanges heat with the first evaporation tube section and the second evaporation tube section respectively). After the air at the lower part is cooled by the second evaporation tube section, the moisture in the air is condensed; while due to the higher air temperature at the upper part, the moisture in the air flow is not cooled, but is mixed with the air flow at the lower part and enters the subcooler 3, and then enters the condenser, thereby increasing the condensation temperature of the condenser.

[0090] For example, in the energy-saving drying mode: in order to make full use of the heat exchanger area of ​​the evaporator 7 and reduce the mixing loss of the refrigerant and airflow, the refrigerant flow of the first evaporator pipe section is adjusted so that the upper and lower lines of the evaporator 7 (the first evaporator pipe section and the second evaporator pipe section) have the same evaporation temperature or the same heat exchange capacity.

[0091] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A heat exchange system, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant circulation loop is provided with a compressor, a condenser, a subcooler and an evaporator; Heat exchange pipeline, with heat exchange medium flowing; The subcooler and the condenser are sequentially arranged along the flow direction of the heat exchange medium to perform staged heating on the heat exchange medium; The condenser includes a first condenser and a second condenser, the condensation temperature of the first condenser is higher than the condensation temperature of the second condenser, and the heat exchange medium flows through the second condenser and the first condenser in sequence; The heat exchange pipeline is a heat exchange air path, the heat exchange medium is a heat exchange gas, and the heat exchange air path is sequentially connected to the evaporator, the subcooler, the second condenser, and the first condenser, so that the heat exchange gas flows through the evaporator, the subcooler, the second condenser, and the first condenser in sequence; The evaporator includes a first evaporation tube section and a second evaporation tube section arranged in parallel. In the vertical direction, the first evaporation tube section is located above the second evaporation tube section, and the heat exchange gas flows through the first evaporation tube section and the second evaporation tube section in parallel. The refrigerant outlet of the first condenser is connected to the refrigerant inlet of the subcooler, the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the first evaporation pipe section through a first throttling element, and the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the second evaporation pipe section through a second throttling element, or, The first condenser is connected to the refrigerant inlet of the first evaporation tube section via a first throttling element, the refrigerant outlet of the second condenser is connected to the refrigerant inlet of the subcooler, and the refrigerant outlet of the subcooler is connected to the refrigerant inlet of the second evaporation tube section via a second throttling element, or, The refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are respectively connected to the two refrigerant inlets of the subcooler, and the two refrigerant outlets of the subcooler are respectively connected to the refrigerant inlet of the first evaporation tube section and the refrigerant inlet of the second evaporation tube section through the first throttling element and the second throttling element; The refrigerant entering the second evaporation tube section has a stronger evaporation heat absorption potential than the refrigerant entering the first evaporation tube section.

2. The heat exchange system according to claim 1, characterized in that The compressor has a first air intake port and a second air intake port. The refrigerant outlet of the first evaporation pipe section is connected to the first air intake port, and the refrigerant outlet of the second evaporation pipe section is connected to the second air intake port.

3. The heat exchange system according to any one of claims 1 to 2, characterized in that: The compressor has a first exhaust port and a second exhaust port. The first exhaust port is connected to the refrigerant inlet of the first condenser, and the second exhaust port is connected to the refrigerant inlet of the second condenser.

4. The heat exchange system according to any one of claims 1 to 2, characterized in that: The heat exchange pipeline is a water exchange pipeline, and the heat exchange medium is water.

5. An electrical device, characterized in that: A heat exchange system comprising any one of claims 1 to 4.

6. An electrical device, characterized in that: The heat exchange system comprises the heat exchange system according to any one of claims 1 to 4, wherein the electrical equipment is a heat pump dryer, and the heat pump dryer comprises a drying drum, which is arranged in the heat exchange air path and downstream of the second condenser along the flow direction of the heat exchange gas.

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