Heat pump heat exchanger and energy-saving control method thereof

Abstract

The invention discloses a heat pump heat exchanger and an energy-saving control method thereof.The heat pump heat exchanger comprises an electric shunt valve, a first heat exchanger body, a second heat exchanger body and a third heat exchanger body, and the first heat exchanger body, the second heat exchanger body and the third heat exchanger body are connected to shunt ports of the electric shunt valve respectively. The first heat exchanger, the second heat exchanger and the third heat exchanger are controlled to be opened independently or in multiple ways through the electric shunt valve. The heat exchangers of the outdoor unit are divided into the first heat exchanger, the second heat exchanger and the third heat exchanger, and different heat exchangers are used for different loads by utilizing the electric shunt valve, so that the on-way resistance of refrigerant circulation of the original large heat exchanger can be reduced, the acting of a compressor is reduced, the use energy efficiency of the unit is improved, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] The invention relates to a heat pump heat exchanger and an energy-saving control method thereof. Background Art

[0002] As a household name in the HVAC industry, multi-split units, commonly known as one-to-many products, are actually one outdoor unit that can provide heating or cooling for many indoor units. When designing the outdoor unit heat exchanger, in order to meet the full load operation of all indoor units, the heat exchange area of ​​the outdoor unit heat exchanger needs to be designed to meet the heat exchange capacity of all indoor units. However, after investigation, it was found that in actual use, more than 60% of customers only use part of the load. As a result, when these users use the outdoor unit at a small load, the energy consumption is high due to the large heat exchanger. Summary of the invention

[0003] In view of the above problems, the present invention provides a heat pump heat exchanger and an energy-saving control method thereof, which effectively solves the problems pointed out in the background technology.

[0004] The technical solution adopted by the present invention is:

[0005] A heat pump heat exchanger comprises an electric branch valve, and a first heat exchanger, a second heat exchanger and a third heat exchanger respectively connected to the branch ports of the electric branch valve, wherein the heat exchange capacity of the first heat exchanger and the second heat exchanger is 25% of the total output capacity of the outdoor unit, and the heat exchange capacity of the third heat exchanger is 50% of the total output capacity of the outdoor unit, and the electric branch valve is used to control the single-way opening or multi-way opening of the first heat exchanger, the second heat exchanger and the third heat exchanger.

[0006] Preferably, when the first heat exchanger or the second heat exchanger is turned on alone, the output capacity of the outdoor unit is 25%; when the first heat exchanger and the second heat exchanger are turned on simultaneously, or the third heat exchanger is turned on alone, the output capacity of the outdoor unit is 50%; when the third heat exchanger and the first heat exchanger, or the third heat exchanger and the second heat exchanger are turned on simultaneously, the output capacity of the outdoor unit is 75%; when the first heat exchanger, the second heat exchanger and the third heat exchanger are turned on simultaneously, the output capacity of the outdoor unit is 100%.

[0007] At the same time, the present invention also provides an energy-saving control method for a heat pump heat exchanger. When the heat pump heat exchanger is running, the electric branch valve is used to control the individual or multi-way opening of the first heat exchanger, the second heat exchanger and the third heat exchanger according to the opening load of the indoor unit, as follows:

[0008] 1) When the opening load of the indoor unit is 25% of the output capacity of the outdoor unit, the electric shunt valve controls the first heat exchanger or the second heat exchanger to open;

[0009] 2) When the opening load of the indoor unit is 50% of the output capacity of the outdoor unit, the electric shunt valve controls the first heat exchanger and the second heat exchanger to open, or controls the third heat exchanger to open alone;

[0010] 3) When the opening load of the indoor unit is 75% of the output capacity of the outdoor unit, the electric shunt valve controls the first heat exchanger and the third heat exchanger, or the second heat exchanger and the third heat exchanger to open at the same time;

[0011] 4) When the opening load of the indoor unit is 100% of the output capacity of the outdoor unit, the electric shunt valve controls the first heat exchanger, the second heat exchanger and the third heat exchanger to be opened simultaneously.

[0012] Preferably, when the heat pump heat exchanger is in cooling mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure:

[0013] If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve according to the system preset;

[0014] If pd≥2.8Mpa, the output capacity of the outdoor unit is increased in sequence through the electric shunt valve until the first heat exchanger, the second heat exchanger and the third heat exchanger are all opened;

[0015] If pd≤2.3Mpa, the output capacity of the outdoor unit will be reduced in sequence through the electric bypass valve until the output capacity of the outdoor unit is reduced to 25%;

[0016] If 2.3Mpa<pd<2.8Mpa, the current output capacity of the outdoor unit remains unchanged;

[0017] Where pd is the high pressure.

[0018] Preferably, when the heat pump heat exchanger is in heating mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure:

[0019] If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve according to the system preset;

[0020] If pd≤3.0Mpa, the output capacity of the outdoor unit is increased in sequence through the electric shunt valve until the first heat exchanger, the second heat exchanger and the third heat exchanger are all opened;

[0021] If pd≥3.8Mpa, the output capacity of the outdoor unit will be reduced in sequence through the electric bypass valve until the output capacity of the outdoor unit is reduced to 25%;

[0022] If 3.0Mpa<pd<3.8Mpa, the current output capacity of the outdoor unit remains unchanged;

[0023] Where pd is the high pressure.

[0024] The present invention divides the heat exchanger of the outdoor unit into a first heat exchanger, a second heat exchanger and a third heat exchanger, and uses an electric bypass valve to realize the use of different heat exchangers for different loads. In this way, the resistance along the refrigerant circulation of the original large heat exchanger can be reduced, thereby reducing the work of the compressor, improving the energy efficiency of the unit, and achieving the purpose of energy saving. At the same time, the electric bypass valve is used to control the individual or multi-way opening of the first heat exchanger, the second heat exchanger and the third heat exchanger, so as to adjust the actual output capacity of the outdoor unit to meet the load requirements of the indoor unit and reduce the energy consumption of the outdoor unit.

[0025] After energy-saving control, the present invention also has the following advantages:

[0026] 1. According to different loads in the room, the electric bypass valve is used to open different outdoor heat exchangers. Because the heat exchanger stroke is reduced, the resistance along the flow of refrigerant in the pipeline is reduced, making the unit more energy-saving and power-saving;

[0027] 2. Solve the problem that the outdoor ambient temperature is low, causing the refrigerant flow rate to be too low and the indoor unit cannot refrigerate;

[0028] 3. It solves the problem that the outdoor ambient temperature is high and the heat exchanger is too large, causing high-voltage failure of the unit and resulting in the inability to heat the room. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the heat pump heat exchanger of the present invention;

[0030] Figure 2 This is a structural schematic diagram of a heat pump heat exchanger applied to a heat pump system. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0038] Example 1

[0039] like Figure 1As shown, a heat pump heat exchanger includes an electric branch valve 4, and a first heat exchanger 5, a second heat exchanger 6 and a third heat exchanger 7 respectively connected to the branch ports of the electric branch valve 4, the heat exchange capacity of the first heat exchanger 5 and the second heat exchanger 6 is 25% of the total output capacity of the outdoor unit, the heat exchange capacity of the third heat exchanger 7 is 50% of the total output capacity of the outdoor unit, and the electric branch valve 4 is used to control the single-way opening or multi-way opening of the first heat exchanger 5, the second heat exchanger 6 and the third heat exchanger 7.

[0040] When the first heat exchanger 5 or the second heat exchanger 6 is turned on alone, the output capacity of the outdoor unit is 25%; when the first heat exchanger 5 and the second heat exchanger 6 are turned on at the same time, or the third heat exchanger 7 is turned on alone, the output capacity of the outdoor unit is 50%; when the third heat exchanger 7 and the first heat exchanger 5, or the third heat exchanger 7 and the second heat exchanger 6 are turned on at the same time, the output capacity of the outdoor unit is 75%; when the first heat exchanger 5, the second heat exchanger 6 and the third heat exchanger 7 are turned on at the same time, the output capacity of the outdoor unit is 100%.

[0041] The heat pump heat exchanger of the present invention can directly replace the heat exchanger in the conventional heat pump system, such as Figure 2 As shown, for such a heat pump system, the present invention also provides an energy-saving control method for a heat pump heat exchanger. When the heat pump heat exchanger is running, the electric branch valve 4 is used to control the single or multi-way opening of the first heat exchanger 5, the second heat exchanger 6 and the third heat exchanger 7 according to the opening load of the indoor unit, as follows:

[0042] 1) When the opening load of the indoor unit is 25% of the output capacity of the outdoor unit, the electric bypass valve 4 controls the first heat exchanger 5 or the second heat exchanger 6 to open;

[0043] 2) When the opening load of the indoor unit is 50% of the output capacity of the outdoor unit, the electric shunt valve 4 controls the first heat exchanger 5 and the second heat exchanger 6 to open, or controls the third heat exchanger 7 to open alone;

[0044] 3) When the opening load of the indoor unit is 75% of the output capacity of the outdoor unit, the electric shunt valve 4 controls the first heat exchanger 5 and the third heat exchanger 7, or the second heat exchanger 6 and the third heat exchanger 7 to open at the same time;

[0045] 4) When the opening load of the indoor unit is 100% of the output capacity of the outdoor unit, the electric bypass valve 4 controls the first heat exchanger 5, the second heat exchanger 6 and the third heat exchanger 7 to open simultaneously.

[0046] When the heat pump heat exchanger is in cooling mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure:

[0047] If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve 4 according to the system preset;

[0048] If pd≥2.8Mpa, the output capacity of the outdoor unit is increased in sequence through the electric bypass valve 4, and the output capacity increases in the order of 25%, 50%, 75%, and 100% until the first heat exchanger 5, the second heat exchanger 6, and the third heat exchanger 7 are all opened;

[0049] If pd≤2.3Mpa, the output capacity of the outdoor unit is reduced in sequence through the electric bypass valve 4, and the output capacity is reduced in the order of 100%, 75%, 50%, and 25% until the output capacity of the outdoor unit is reduced to 25%;

[0050] If 2.3Mpa<pd<2.8Mpa, the current output capacity of the outdoor unit remains unchanged;

[0051] Where pd is the high pressure.

[0052] When the heat pump heat exchanger is in heating mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure:

[0053] If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve 4 according to the system preset;

[0054] If pd≤3.0Mpa, the output capacity of the outdoor unit is increased in sequence through the electric bypass valve 4, and the output capacity increases in the order of 25%, 50%, 75%, and 100% until the first heat exchanger 5, the second heat exchanger 6, and the third heat exchanger 7 are all opened;

[0055] If pd≥3.8Mpa, the output capacity of the outdoor unit is reduced in sequence through the electric bypass valve 4, and the output capacity is reduced in the order of 100%, 75%, 50%, and 25% until the output capacity of the outdoor unit is reduced to 25%;

[0056] If 3.0Mpa<pd<3.8Mpa, the current output capacity of the outdoor unit remains unchanged;

[0057] Where pd is the high pressure.

[0058] The heat exchanger module 3 in the embodiment of the present invention adopts the first heat exchanger 5, the second heat exchanger 6 and the third heat exchanger 7 to form the total output capacity of the outdoor unit. In actual application, the number of heat exchangers can be increased or decreased according to demand, and the output capacity of each heat exchanger can be adjusted accordingly. At the same time, the control method is also adjusted accordingly. The above adjustments are all simple variations of the embodiment of the present invention. They are similar to the structure of the present invention and have the same working principle, and are considered to be within the protection scope of the present invention.

[0059] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A heat pump heat exchanger, characterized in that: The invention comprises an electric split valve (4), and a first heat exchanger (5), a second heat exchanger (6), and a third heat exchanger (7) respectively connected to the split ports of the electric split valve (4), wherein the heat exchange capacity of the first heat exchanger (5) and the second heat exchanger (6) is 25% of the total output capacity of the outdoor unit, and the heat exchange capacity of the third heat exchanger (7) is 50% of the total output capacity of the outdoor unit, and the electric split valve (4) is used to control the single-way opening or multi-way opening of the first heat exchanger (5), the second heat exchanger (6), and the third heat exchanger (7).

2. A heat pump heat exchanger according to claim 1, characterized in that: When the first heat exchanger (5) or the second heat exchanger (6) is turned on alone, the output capacity of the outdoor unit is 25%; when the first heat exchanger (5) and the second heat exchanger (6) are turned on simultaneously, or when the third heat exchanger (7) is turned on alone, the output capacity of the outdoor unit is 50%; when the third heat exchanger (7) and the first heat exchanger (5), or the third heat exchanger (7) and the second heat exchanger (6) are turned on simultaneously, the output capacity of the outdoor unit is 75%; when the first heat exchanger (5), the second heat exchanger (6) and the third heat exchanger (7) are turned on simultaneously, the output capacity of the outdoor unit is 100%.

3. An energy-saving control method for a heat pump heat exchanger according to claim 1 or 2, characterized in that: When the heat pump heat exchanger is in operation, the electric branch valve (4) is used to control the individual or multi-way opening of the first heat exchanger (5), the second heat exchanger (6) and the third heat exchanger (7) according to the opening load of the indoor unit, as follows: 1) When the opening load of the indoor unit is 25% of the output capacity of the outdoor unit, the electric bypass valve (4) controls the first heat exchanger (5) or the second heat exchanger (6) to open; 2) When the opening load of the indoor unit is 50% of the output capacity of the outdoor unit, the electric shunt valve (4) controls the first heat exchanger (5) and the second heat exchanger (6) to open, or controls the third heat exchanger (7) to open alone; 3) When the opening load of the indoor unit is 75% of the output capacity of the outdoor unit, the electric bypass valve (4) controls the first heat exchanger (5) and the third heat exchanger (7), or the second heat exchanger (6) and the third heat exchanger (7) to open simultaneously; 4) When the opening load of the indoor unit is 100% of the output capacity of the outdoor unit, the electric bypass valve (4) controls the first heat exchanger (5), the second heat exchanger (6) and the third heat exchanger (7) to open simultaneously.

4. The energy-saving control method of a heat pump heat exchanger according to claim 3, characterized in that: When the heat pump heat exchanger is in cooling mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure: If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve (4) according to the system preset; If pd≥2.8Mpa, the output capacity of the outdoor unit is increased in sequence through the electric bypass valve (4) until the first heat exchanger (5), the second heat exchanger (6) and the third heat exchanger (7) are all opened; If pd≤2.3Mpa, the output capacity of the outdoor unit is reduced in sequence through the electric bypass valve (4) until the output capacity of the outdoor unit is reduced to 25%; If 2.3Mpa<pd<2.8Mpa, the current output capacity of the outdoor unit remains unchanged; Among them, pd is the high pressure.

5. The energy-saving control method for a heat pump heat exchanger according to claim 3, characterized in that: When the heat pump heat exchanger is in heating mode, the following adjustments are made simultaneously according to the opening change of the indoor unit and the high pressure: If the number of indoor units turned on decreases or increases, the corresponding heat exchanger is turned on through the electric bypass valve (4) according to the system preset; If pd≤3.0Mpa, the output capacity of the outdoor unit is increased in sequence through the electric bypass valve (4) until the first heat exchanger (5), the second heat exchanger (6) and the third heat exchanger (7) are all opened; If pd≥3.8Mpa, the output capacity of the outdoor unit is reduced in sequence through the electric bypass valve (4) until the output capacity of the outdoor unit is reduced to 25%; If 3.0Mpa<pd<3.8Mpa, the current output capacity of the outdoor unit remains unchanged; Among them, pd is the high pressure.

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