Heat exchange system and electric appliance

Abstract

The present application relates to heat exchange technical field, provide a kind of heat exchange system and electrical equipment.The heat exchange system includes: refrigerant circulation loop, is provided with compressor, first condenser and second condenser;The first cavity for accommodating motor is formed in the shell of compressor, and the compressor mechanism is arranged in the shell, and the compressor mechanism is configured with first compression cavity and second compression cavity;First and second exhaust structure are provided on the shell;First compression cavity is sequentially connected with first condenser by first cavity and first exhaust structure, and second compression cavity is connected with second condenser by second exhaust structure;The first pressure at first exhaust structure is lower than the second pressure at second exhaust structure;The part of refrigerant circulation loop between second compression cavity and second condenser is connected with first cavity by oil return component.This kind of heat exchange system, utilizes the pressure difference between second exhaust structure and first exhaust structure to reduce the oil discharge amount of compressor, avoids oil into condenser, guarantees the heat exchange efficiency of condenser.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and more particularly to heat exchange systems and electrical equipment. Background Technology

[0002] Compressors are widely used in electrical appliances with heat exchange systems, such as air conditioners and heat pump dryers. Regardless of the type of compressor, its discharge port has a certain oil discharge rate. For conventional single-discharge compressors, the gas passes through a motor and oil baffle before reaching the discharge port. These components help separate the gas from the oil, resulting in a relatively low oil discharge rate at the discharge port, generally meeting the compressor's operational requirements. However, for dual-discharge compressors, one cylinder's refrigerant is directly discharged from the compressor, leading to excessively high oil discharge. While connecting a conventional oil separator to the compressor discharge port corresponding to this refrigerant path can reduce the oil discharge, it still may not meet the compressor's oil discharge requirements. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a heat exchange system that, while having two exhaust structures, can meet the compressor's oil discharge requirements.

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

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

[0006] A refrigerant circulation loop is provided, in which a compressor, a first condenser, and a second condenser are arranged; a first cavity for accommodating a motor is formed within the housing of the compressor, and a compression mechanism is provided within the housing, the compression mechanism having a first compression chamber and a second compression chamber; a first exhaust structure and a second exhaust structure are provided on the housing; the first compression chamber is connected to the first condenser sequentially through the first cavity and the first exhaust structure, and the second compression chamber is connected to the second condenser through the second exhaust structure;

[0007] The first pressure of the refrigerant at the first exhaust structure is lower than the second pressure of the refrigerant at the second exhaust structure; the portion of the refrigerant circulation loop located between the second compression chamber and the second condenser is connected to the first chamber through an oil return component.

[0008] According to the heat exchange system of this invention, since the portion of the refrigerant circulation loop located between the second compression chamber and the second condenser is connected to the first chamber via an oil return component, the pressure difference between the second exhaust structure and the first exhaust structure can be utilized to allow the oil discharged from the second exhaust structure along with the refrigerant to flow back to the first chamber under the action of the pressure difference, thereby reducing the amount of oil discharged by the compressor. Furthermore, in this heat exchange system, even if some oil is discharged from the compressor through the second exhaust structure, most of the oil will not enter the condenser (unless otherwise specified, "condenser" refers to at least one of the first and second condensers), thus ensuring the heat exchange efficiency of the condenser.

[0009] According to one embodiment of the present invention, the oil return component includes:

[0010] An oil separator connects the second compression chamber and the second condenser;

[0011] The return valve is connected at one end to the oil separator and at the other end to the first cavity.

[0012] According to one embodiment of the present invention, the heat exchange system includes:

[0013] In the heat exchange air path, the first condenser and the second condenser are arranged sequentially along the flow direction of the airflow in the heat exchange air path and heat the airflow in stages.

[0014] According to one embodiment of the present invention, the first condenser and the second condenser are integrated. The first condenser includes a first condensing tube section, and the second condenser includes a second condensing tube section and a subcooling tube section arranged sequentially along the refrigerant flow direction. The subcooling tube section can exchange heat with the first condensing tube section.

[0015] According to one embodiment of the present invention, the flow direction of the refrigerant in the subcooled pipe section is opposite to the flow direction of the airflow outside the first condenser pipe section in the heat exchange air path.

[0016] According to one embodiment of the present invention, the refrigerant outlet of the second condenser is connected to a bypass cooler.

[0017] According to one embodiment of the present invention, the subcooler is located outside the heat exchange air path.

[0018] or,

[0019] The subcooler is located in the heat exchange air path, and the subcooler, the first condenser and the second condenser are arranged in sequence along the flow direction of the airflow.

[0020] According to one embodiment of the present invention, the refrigerant circulation loop includes a first evaporator section and a second evaporator section;

[0021] The heat exchange air path includes a first branch and a second branch connected in parallel. The airflow in the first branch flows through the first evaporator tube section, and the airflow in the second branch flows through the second evaporator tube section.

[0022] The outlet temperature of the first branch is different from that of the second branch, and the first branch and the second branch merge before the first condenser.

[0023] According to one embodiment of the present invention, the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are connected to a common pipeline, and the common pipeline can selectively connect to the first evaporator section and / or the second evaporator section.

[0024] According to one embodiment of the present invention, the diameter of the first evaporation tube section is smaller than the diameter of the second evaporation tube section, and / or the gap between the tube sections of the first evaporation tube section is larger than the gap between the tube sections of the second evaporation tube section.

[0025] According to one embodiment of the present invention, the refrigerant circulation loop includes an evaporator, and the refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are both connected to the refrigerant inlet of the evaporator.

[0026] An electrical device according to a second aspect of the present invention includes the heat exchange system described above.

[0027] According to one embodiment of the present invention, the electrical device is a heat pump dryer, the heat pump dryer includes a drying cylinder, the drying cylinder is disposed in a heat exchange air path and is disposed downstream of the second condenser along the flow direction of the airflow.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a heat pump dryer provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a heat pump dryer provided in an embodiment of the present invention, wherein the heat exchange system of the heat pump dryer includes a subcooler;

[0032] Figure 3 This is a schematic diagram of the structure of a heat pump dryer provided in an embodiment of the present invention, wherein the heat exchange system of the heat pump dryer includes an integrally formed condenser;

[0033] Figure 4 This is a schematic diagram of the structure of a heat pump dryer provided in an embodiment of the present invention, wherein the heat exchange system of the heat pump dryer includes an integrally disposed condenser and an integrally disposed evaporator;

[0034] Figure 5 This is a schematic diagram of the condenser provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of one type of evaporator provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of another type of evaporator provided in an embodiment of the present invention.

[0037] Figure label:

[0038] 101: Compressor; 102: First condenser; 103: Second condenser; 104: Oil separator; 105: Evaporator; 1051: First evaporator section; 1052: Second evaporator section; 106: Drying drum; 107: Oil return valve;

[0039] 201: Subcooler;

[0040] 301: Integrated condenser; 3011: First condenser section; 3012: Second condenser section; 3013: Subcooling section;

[0041] 401: Control valve. Detailed Implementation

[0042] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0045] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Please see Figures 1 to 7According to an embodiment of the first aspect of the present invention, a heat exchange system is provided. The heat exchange system includes a refrigerant circulation loop, on which a compressor 101, a first condenser 102, and a second condenser 103 are disposed; the compressor 101 has a first cavity formed within its housing for accommodating a motor, and a compression mechanism is disposed within the housing, the compression mechanism comprising a first compression chamber and a second compression chamber; the housing is provided with a first exhaust structure and a second exhaust structure.

[0048] The first compression chamber is connected to the first condenser 102 via the first cavity and the first exhaust structure, and the second compression chamber is connected to the second condenser 103 via the second exhaust structure; the first pressure of the refrigerant at the first exhaust structure is lower than the second pressure of the refrigerant at the second exhaust structure; the portion of the refrigerant circulation loop located between the second compression chamber and the second condenser 103 is connected to the first cavity via the oil return component.

[0049] According to the heat exchange system of this embodiment, since the portion of the refrigerant circulation loop located between the second compression chamber and the second condenser 103 is connected to the first chamber through an oil return component, the pressure difference between the second exhaust structure and the first exhaust structure can be utilized to allow the oil discharged from the second exhaust structure with the refrigerant to flow back to the first chamber under the action of the pressure difference, thereby reducing the oil discharge of the compressor 101. Furthermore, in this heat exchange system, even if some oil is discharged from the compressor 101 through the second exhaust structure, most of the oil will not enter the condenser (unless otherwise specified, the condenser refers to at least one of the first condenser 102 and the second condenser 103), thus ensuring the heat exchange efficiency of the condenser.

[0050] The refrigerant flows from the second compression chamber towards the second condenser, carrying oil from inside the compressor into the oil return component. Since the oil return component is also connected to the first chamber, and the pressure of the refrigerant entering the oil return component is greater than the pressure in the first chamber, the oil in the oil return component enters the first chamber under the pressure difference between the refrigerant pressure and the pressure in the first chamber.

[0051] "The portion of the refrigerant circulation loop located between the second compression chamber and the second condenser 103" can refer to the pipe section located between the second compression chamber and the second condenser 103, or it can refer to a specific component connected in the pipe section located between the second compression chamber and the second condenser 103.

[0052] The first pressure of the refrigerant at the first exhaust structure corresponds to one of the evaporation pressures in the heat exchange system, and the second pressure of the refrigerant at the second exhaust structure corresponds to another evaporation pressure in the heat exchange system. Under the same conditions, the higher the evaporation pressure (unless otherwise specified, the evaporation pressure refers to at least one of the first and second pressures), the higher the condensation pressure returning to the compressor 101 inlet, and the higher the corresponding condensation temperature in the refrigerant circulation loop.

[0053] The specific forms of the first and second exhaust structures are not limited. For example, both the first and second exhaust structures can adopt the structure of an exhaust port; for another example, both the first and second exhaust structures can adopt the structure of an exhaust pipe; yet another example is that one of the first and second exhaust structures can adopt the structure of an exhaust port, and the other adopts the structure of an exhaust pipe.

[0054] Furthermore, for the heat exchange system, since its compressor 101 has a first exhaust structure and a second exhaust structure, it can be considered that a first refrigerant circulation loop is formed between the first exhaust structure and the components connected to the first exhaust structure, and a second refrigerant circulation loop is formed between the second exhaust structure and the components connected to the second exhaust structure. In addition, this type of dual-exhaust compressor 101 generally has only one air inlet.

[0055] Please see Figures 1 to 4 The oil return component includes an oil separator 104, which is located between the second exhaust structure and the second condenser 103. The oil separator 104 is connected to the first cavity through the oil return component. In this case, the pressure of the oil separator 104 at the second exhaust structure is greater than the pressure of the oil separator 104 at the first cavity. As a result, the oil carried in the refrigerant will flow back to the first cavity through the oil separator 104, improving the lubrication effect of the motor in the first cavity, reducing the oil content in the condenser (second condenser 103) in the second refrigerant circulation loop, and ensuring the heat exchange effect of the second refrigerant circulation loop.

[0056] In one embodiment, the oil return component further includes an oil return valve 107. One end of the oil return valve is connected to the oil separator 104, and the other end is connected to the first chamber. The oil return is then controlled by controlling the opening and closing of the oil return valve 107.

[0057] The high-temperature, high-pressure gaseous refrigerant discharged from compressor 101 flows through two paths: one through the first chamber (where the motor flows through the first chamber) into the first condenser 102, and the other through the oil separator 104 into the second condenser 103, where it exchanges heat with external cold air. The gaseous refrigerant passing through the first chamber has a relatively low oil content. However, if the gaseous refrigerant in the second exhaust structure (the gaseous refrigerant in the second refrigerant circulation loop) does not have an oil return component to appropriately reduce its oil content and instead directly enters the refrigerant circulation loop, it will affect the heat exchange efficiency of the heat exchange system.

[0058] In one embodiment, the oil return component adopts the structure of an oil return pipe.

[0059] In one embodiment, the return oil pipe includes a variable cross-section section. The variable cross-section section causes a greater pressure loss along the oil flow path as the oil flows through the return oil pipe, thereby reducing the amount of refrigerant that flows back to the compressor 101 with the oil.

[0060] In one embodiment, the cross-sectional area of ​​the variable cross-section pipe section gradually increases along the return flow direction, thereby gradually reducing the return oil pressure along the length of the variable cross-section pipe section. This variable cross-section pipe section increases the return oil pressure loss and reduces the amount of refrigerant flowing back to the compressor 101 through the return oil pipe.

[0061] According to an embodiment of the present invention, the heat exchange system includes a heat exchange air path. A first condenser 102 and a second condenser 103 are arranged sequentially along the flow direction of the airflow in the heat exchange air path and heat the airflow in stages.

[0062] Since the first condenser 102 and the second condenser 103 are arranged sequentially along the flow direction of the airflow in the heat exchange air path, the external airflow can be gradually heated, so that the airflow in the heat exchange air path can obtain a higher temperature. Because the first condensation temperature of the first refrigerant circulation loop corresponding to the first condenser 102 is lower than the second condensation temperature of the second refrigerant circulation loop corresponding to the second condenser 103, the heat exchange air path can achieve higher heat exchange efficiency by using the first condensation temperature and the second condensation temperature for stepped heating.

[0063] The heat exchange system according to an embodiment of the present invention includes components such as an evaporator 105 and a throttling element. Specifically, after the refrigerant flows out from the compressor 101, it passes sequentially through the condenser, the throttling element, and the evaporator 105.

[0064] In the heat exchange air path of the heat exchange system, the airflow becomes cold air at a lower temperature after passing through the evaporator 105. The temperature of the cold air rises after passing through the first condenser 102, resulting in a higher temperature when the airflow passes through the second condenser 103. Consequently, the refrigerant temperature at the refrigerant outlet of the second condenser 103 is higher, and the subcooling is smaller. Based on this, a subcooling section is provided in the heat exchange system of the embodiment of the present invention. This subcooling section can be either the subcooling pipe section 3013 mentioned below or the subcooler 201 mentioned below.

[0065] In one embodiment, see Figure 5 The first condenser 102 and the second condenser 103 are integrated to form an integrated condenser 301. The first condenser 102 includes a first condensing tube section 3011, and the second condenser 103 includes a second condensing tube section 3012 and a subcooling tube section 3013 arranged sequentially along the refrigerant flow direction. The subcooling tube section 3013 is located around the first condensing tube section 3011. Since the first condensing temperature of the first condenser 102 is lower than the second condensing temperature of the second condenser 103, when the subcooling tube section 3013 is located around the first condensing tube section 3011, the first condensing tube section 3011 can cool the subcooling tube section 3013, ensuring the subcooling effect of the second condenser 103. At the same time, the high-temperature refrigerant in the subcooling tube section can also exchange energy back into the space of the first condensing tube section, achieving full utilization of energy.

[0066] In this case, by forming a subcooled pipe section 3013 within the second condenser 103 itself and placing the subcooled pipe section 3013 around the first condensing pipe section 3011 of the first condenser 102, the cost of the heat exchange system can be reduced and its structure simplified. Of course, placing the subcooled pipe section 3013 around the first condensing pipe section 3011 is just one embodiment; any arrangement that allows the subcooled pipe section 3013 to exchange heat with the first condensing pipe section 3011 is acceptable, such as placing it inside the first condensing pipe section 3011. Furthermore, integrating the first condenser 102 and the second condenser 103 facilitates the installation of the heat exchange system and saves space.

[0067] Since the condensing temperatures of the first condenser 102 and the second condenser 103 are different, in order to reduce the thermal bridge effect, the fins on the first condenser tube section 3011 and the fins on the second condenser tube section 3012 are disconnected. Figure 5In the diagram, the vertical dashed line corresponds to the location where the fins break. Specifically, the portion of the integrated condenser 301 located to the left of the vertical dashed line and above the curved dashed line corresponds to the first condenser tube segment 3011; the portion of the integrated condenser 301 located to the right of the vertical dashed line corresponds to the second condenser tube segment 3012; and the portion of the integrated condenser 301 located to the left of the vertical dashed line and below the curved dashed line corresponds to the subcooling tube segment 3013.

[0068] In one embodiment, to ensure refrigerant flow in the refrigerant circulation loop, the refrigerant is generally introduced into the condenser inlet from top to bottom. Under this premise, the subcooling pipe section 3013 is positioned below the first condensing pipe section 3011, thereby allowing for... Figure 5 The condenser has an inlet and an outlet, with four arrows corresponding to the inlet and outlet of the first condenser tube section 3011, the inlet of the second condenser tube section 3012, and the outlet of the subcooling tube section 3013, respectively.

[0069] In one embodiment, when the heat exchange system includes a heat exchange air path, the flow direction of the refrigerant in the subcooled pipe section 3013 is opposite to the flow direction of the airflow outside the first condenser pipe section 3011 in the heat exchange air path. As the airflow passes through the first condenser pipe section 3011, the temperature of the airflow gradually increases under the heat exchange effect of the first condenser pipe section 3011, and consequently, the temperature of the refrigerant in the subcooled pipe section 3013 gradually decreases along the flow direction under the action of the airflow outside the first condenser pipe section 3011.

[0070] According to an embodiment of the present invention, the second condenser 103 does not have a subcooling pipe section 3013, but instead connects to the subcooler 201 at the refrigerant outlet of the second condenser 103. Therefore, the subcooler 201 is used to reduce the refrigerant temperature downstream of the second condenser 103, ensuring the normal operation of the second refrigerant circulation loop.

[0071] According to an embodiment of the present invention, the subcooler 201 is located outside the heat exchange air path. In this case, the subcooler 201 is cooled by cold air from outside the heat exchange air path. Furthermore, the subcooler 201 can be placed near the compressor 101 to prevent the compressor 101 from exhausting at high temperatures.

[0072] According to an embodiment of the present invention, the subcooler 201 can also be arranged in the heat exchange air path, and the subcooler 201, the first condenser 102 and the second condenser 103 are arranged sequentially along the airflow direction of the heat exchange air path. In this case, the airflow in the heat exchange air path flows through the subcooler 201 before passing through the first condenser 102, thereby cooling the subcooler 201, which can also ensure the normal operation of the second refrigerant circulation loop.

[0073] According to an embodiment of the present invention, the refrigerant circulation loop includes a first evaporator section 1051 and a second evaporator section 1052. The first evaporator section 1051 and the second evaporator section 1052 may be formed in the same evaporator 105 or in different evaporators 105.

[0074] The heat exchange air path includes a first branch and a second branch connected in parallel. The airflow in the first branch flows through the first evaporator tube section 1051, and the airflow in the second branch flows through the second evaporator tube section 1052. The outlet temperatures of the first and second branches are different, and the first and second branches converge before the first condenser 102. In this case, because the airflow temperatures after passing through the first and second evaporator tube sections 1051 and 1052 are different, i.e., the outlet temperatures of the first and second branches are different, the humidity of the airflow at the condenser inlet can be effectively controlled while ensuring the airflow temperature at the condenser inlet. The outlet temperature of the first branch corresponds to the cooling capacity of the first evaporator tube section 1051, and the outlet temperature of the second branch corresponds to the cooling capacity of the second evaporator tube section 1052.

[0075] For example, the outlet temperature of the first branch can be higher, while the outlet temperature of the second branch can be lower. Thus, the airflow has higher temperature and humidity after passing through the first branch; when the airflow passes through the second branch, its temperature decreases, and the water vapor it carries condenses on the surface of the second evaporator section 1052, resulting in lower temperature and humidity. Based on this, mixing the airflows from the first and second branches yields an airflow with both temperature and humidity meeting the requirements. Especially when this heat exchange system, including heat exchange airflow paths, is used for drying, the arrangement of the first and second evaporator sections 1051 and 1052 can improve drying efficiency while saving energy.

[0076] In one embodiment, the heat exchange system includes two evaporators 105, one of which includes the first evaporation tube section 1051 mentioned above, and the other evaporator 105 includes a second evaporation tube section 1052, thereby obtaining different heat exchange temperatures through the two evaporators 105.

[0077] In another embodiment, please refer to Figure 6 and Figure 7 The first evaporator tube section 1051 and the second evaporator tube section 1052 are integrally formed in the same evaporator 105. In this case, the first evaporator tube section 1051 and the second evaporator tube section 1052 have a refrigerant inlet and a refrigerant outlet, respectively. Figure 6 and Figure 7In this configuration, the first evaporator tube section 1051 is positioned above the horizontal dashed line, and the second evaporator tube section 1052 is positioned below the horizontal dashed line. The two arrows above the horizontal dashed line correspond to the refrigerant inlet and outlet of the first evaporator tube section 1051, respectively, while the two arrows below the horizontal dashed line correspond to the refrigerant inlet and outlet of the second evaporator tube section 1052, respectively. In this case, by integrally molding the first evaporator tube section 1051 and the second evaporator tube section 1052, manufacturing costs can be reduced and the structure of the heat exchange system simplified.

[0078] Of course, when the first evaporator section 1051 and the second evaporator section 1052 are integrally formed in the same evaporator 105, the distribution of the first evaporator section 1051 and the second evaporator section 1052 is not affected. Figure 6 and Figure 7 limit.

[0079] According to an embodiment of the present invention, the refrigerant outlet of the first condenser 102 and the refrigerant outlet of the second condenser 103 are connected to a common pipeline, and the common pipeline can selectively connect to the first evaporator section 1051 and / or the second evaporator section 1052. Furthermore, by selecting the evaporator section participating in the operation of the evaporator 105 (unless otherwise specified, the evaporator section refers to at least one of the first evaporator section 1051 and the second evaporator section 1052), different operating modes of the heat exchange system can be matched.

[0080] For example, when the heat exchange system is applied to a clothes dryer, and under the same conditions, the airflow temperature obtained by the heat exchange in the first evaporator section 1051 is higher than the airflow temperature obtained by the heat exchange in the second evaporator section 1052, in the fast drying mode, both the first evaporator section 1051 and the second evaporator section 1052 can be simultaneously activated, allowing both sections to participate in the heat exchange process. In the energy-saving drying mode, only one of the first evaporator section 1051 and the second evaporator section 1052 can be selected to operate; alternatively, both sections can be controlled to operate simultaneously, and the refrigerant flow rate within them can be adjusted.

[0081] Figure 6 In this case, the diameter of the first evaporator section 1051 is smaller than that of the second evaporator section 1052. As a result, the heat exchange capacity of the first evaporator section 1051 is lower than that of the second evaporator section 1052, and the airflow gets different temperatures after passing through the first evaporator section 1051 and the second evaporator section 1052.

[0082] In one embodiment, the first evaporator section 1051 with a smaller diameter is placed below the second evaporator section 1052 with a relatively larger diameter. Since cold air tends to sink, this ensures that the airflow in the first branch and the second branch is mixed evenly.

[0083] Figure 7 In this configuration, the gap between the first evaporator section 1051 and the second evaporator section 1052 is larger. In this case, the heat exchange capacity of the first evaporator section 1051 is lower than that of the second evaporator section 1052, resulting in different temperatures for the airflow after passing through both sections.

[0084] Please see Figure 4 The refrigerant outlets of the first condenser 102 and the second condenser 103 are connected to a common pipeline. This common pipeline is connected to the first evaporator section 1051 via a control valve 401, and is also directly connected to the second evaporator section 1052. Therefore, in this configuration, the second evaporator section 1052 always participates in the heat exchange system, while the first evaporator section 1051 can choose whether or not to participate in the heat exchange system.

[0085] Please see Figures 1 to 4 According to an embodiment of the present invention, the refrigerant circulation loop includes an evaporator 105, and the refrigerant outlets of the first condenser 102 and the second condenser 103 are both connected to the refrigerant inlet of the evaporator 105. In this case, the first condenser 102 and the second condenser 103 share the evaporator 105, thereby simplifying the structure of the heat exchange system. The evaporator 105 can adopt either a conventional structure or a more advanced structure. Figure 6 or Figure 7 The structure in.

[0086] According to an embodiment of the heat exchange system of the present invention, a fan can be installed in the heat exchange air path to accelerate gas flow. Furthermore, to facilitate airflow control in the heat exchange air path, dampers can be installed in the aforementioned first and second branches. For example, dampers can be installed at both the air inlet of the first branch and the air inlet of the second branch; or dampers can be installed at both the air outlet of the first and second branches.

[0087] It should be noted that, Figures 1 to 7 In the diagram, the thick arrows correspond to the direction of airflow in the heat exchange air path, while the thin arrows correspond to the reverse direction of refrigerant flow in the refrigerant circulation loop.

[0088] According to a second aspect of the present invention, an electrical device is provided, which further includes the heat exchange system described above.

[0089] Among these, electrical appliances can be refrigeration equipment such as refrigerators, freezers, and air conditioners, as well as equipment such as dryers, washing machines, heat pump water heaters, heat pump clothes dryers, or heat pump dishwashers. Of course, electrical appliances can also be other equipment that requires a heat exchange system, which will not be listed here.

[0090] When the electrical equipment is a refrigeration device such as a refrigerator, freezer, or air conditioner, the aforementioned heat exchange system may not have a connected heat exchange air path. When the electrical equipment is a dryer, washing machine, or heat pump dryer, the aforementioned heat exchange system generally has a connected heat exchange air path, and the heat exchange loop is often a relatively closed airflow loop.

[0091] According to an embodiment of the present invention, the electrical equipment is briefly described using a heat pump dryer as an example.

[0092] When the heat pump dryer uses the heat exchange system mentioned above, the compressor 101 has two exhaust structures, and a first condenser 102 and a second condenser 103 are respectively provided for the two exhaust structures. This allows the gas in the heat exchange air path to be heated in segments, thereby achieving separate throttling of the first refrigerant circulation loop and the second refrigerant circulation loop, and shortening the drying time.

[0093] Similarly, when the electrical equipment is another product, the working efficiency of the electrical equipment can also be increased by using a dual exhaust compressor 101 and a two-stage condenser.

[0094] According to an embodiment of the present invention, a heat pump dryer includes a drying cylinder 106, which is disposed in a heat exchange air path and downstream of a second condenser 103 along the airflow direction. Subsequently, along the heat exchange air path, the airflow passes sequentially through an evaporator 105, a first condenser 102, a second condenser 103, and a drying cylinder 106.

[0095] The heat exchange principle of the heat exchange air path of a heat pump dryer is roughly as follows: In the heat exchange air path, the gas inside the drying drum 106 exchanges heat with the clothes, removing the moisture from the clothes to obtain high-temperature and high-humidity gas; the high-temperature and high-humidity gas flows from the drying drum 106 to the evaporator 105, where it condenses on the outer surface of the evaporator 105 and undergoes heat exchange to obtain low-temperature and dry gas; this low-temperature and dry gas flows from the evaporator 105 to the condenser, where it is heated to obtain high-temperature and dry gas; this high-temperature and dry gas flows back from the condenser to the drying drum 106 and exchanges heat with the clothes, thus achieving air circulation.

[0096] In the refrigerant circulation loop, the low-temperature, low-pressure gaseous refrigerant in compressor 101 transforms into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant undergoes a phase change (liquefaction) as it flows through the condenser, releasing heat to heat the gas outside the condenser, and the refrigerant inside the condenser transforms into a medium-temperature, medium-pressure liquid refrigerant. This medium-temperature, medium-pressure liquid refrigerant, after being throttled and depressurized by a throttling element (e.g., a capillary tube), enters the evaporator 105. During vaporization and diffusion in the evaporator 105, the refrigerant absorbs heat from the air outside the evaporator 105, transforming into a low-temperature, low-pressure gaseous refrigerant. This low-temperature, low-pressure gaseous refrigerant, after being drawn into compressor 101, undergoes the aforementioned process again to form a refrigeration cycle.

[0097] According to embodiments of the present invention, heat pump dryers have different drying modes, such as low-temperature drying, fast drying, and energy-saving drying. In the dual-exhaust drying system, the stepped heating function of the first condenser 102 and the second condenser 103 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 using the first evaporator section 1051 and the second evaporator section 1052.

[0098] For example, in fast drying mode: to increase the air temperature at the condenser airflow inlet, assuming sufficient heat exchanger area, the refrigerant flow rate or air volume of the first evaporator section 1051 is controlled to achieve different airflow temperatures between the first evaporator section 1051 and the second evaporator section 1052. Figure 6 and Figure 7 For example, the airflow from the drying drum 106 of the heat pump dryer exchanges heat at the top and bottom of the evaporator 105 (that is, it exchanges heat with the first evaporator tube section 1051 and the second evaporator tube section 1052 respectively). The air at the bottom is cooled by the second evaporator tube section 1052, and the moisture in the air is condensed. However, because the air temperature at the top is higher, the moisture in the airflow is not cooled, but mixes with the airflow at the bottom and enters the condenser, thereby increasing the condensing temperature of the condenser.

[0099] For example, in the energy-saving drying mode: in order to make full use of the heat exchanger area of ​​the evaporator 105 and reduce the mixing loss of refrigerant and airflow, the refrigerant flow rate of the first evaporator tube section 1051 is adjusted so that the upper and lower paths of the evaporator 105 (the first evaporator tube section 1051 and the second evaporator tube section 1052) have the same evaporation temperature or the same heat exchange capacity.

[0100] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A heat exchange system, characterized in that, include: A refrigerant circulation loop includes a compressor, a first condenser, a second condenser, a first evaporator section, and a second evaporator section. The compressor housing contains a first cavity for accommodating a motor, and a compression mechanism with a first compression chamber and a second compression chamber is also provided within the housing. The housing has a first exhaust structure and a second exhaust structure. The first compression chamber is connected to the first condenser sequentially through the first cavity and the first exhaust structure. The second compression chamber is connected to the second condenser via the second exhaust structure. The first and second condensers are integrated. The first condenser includes a first condensing pipe section, and the second condenser includes a second condensing pipe section and a subcooling pipe section sequentially arranged along the refrigerant flow direction. The subcooling pipe section exchanges heat with the first condensing pipe section. The diameter of the first evaporator section is smaller than the diameter of the second evaporator section, and vertically, the first evaporator section is located below the second evaporator section. The heat exchange air path includes a first condenser and a second condenser arranged sequentially along the flow direction of the airflow in the heat exchange air path and heating the airflow in stages; the heat exchange air path includes a first branch and a second branch connected in parallel, the airflow in the first branch flows through the first evaporator tube section, and the airflow in the second branch flows through the second evaporator tube section; The outlet temperature of the first branch is different from that of the second branch, and the first branch and the second branch merge before the first condenser; The first pressure of the refrigerant at the first exhaust structure is lower than the second pressure of the refrigerant at the second exhaust structure; the portion of the refrigerant circulation loop located between the second compression chamber and the second condenser is connected to the first chamber through an oil return component.

2. The heat exchange system according to claim 1, characterized in that, The oil return component includes: An oil separator connects the second compression chamber and the second condenser; The return valve is connected at one end to the oil separator and at the other end to the first cavity.

3. The heat exchange system according to claim 1, characterized in that, The direction of refrigerant flow in the subcooled pipe section is opposite to the direction of airflow flow outside the first condenser pipe section in the heat exchange air path.

4. The heat exchange system according to any one of claims 1 to 3, characterized in that, The refrigerant outlet of the first condenser and the refrigerant outlet of the second condenser are connected to a common pipeline, and the common pipeline connects to the first evaporator section and / or the second evaporator section.

5. The heat exchange system according to any one of claims 1 to 3, characterized in that, The gap between the first evaporator tube section is greater than the gap between the second evaporator tube section.

6. An electrical appliance, characterized in that, Includes the heat exchange system according to any one of claims 1 to 5.

7. An electrical appliance, characterized in that, The heat exchange system includes any one of claims 1 to 5, wherein the electrical device is a heat pump dryer, the heat pump dryer includes a drying cylinder, the drying cylinder is disposed in the heat exchange air path and is disposed downstream of the second condenser along the flow direction of the airflow.

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