Heat pump air conditioning system with fan stepless speed regulation control function

Abstract

The invention relates to a heat pump air conditioning system with fan stepless speed regulation control, which is characterized in that a controller obtains the actual rotating speed of a fan, the frequency of a compressor, the environment temperature and the refrigerant outlet temperature of an indoor heat exchanger at the current moment, and calculates the difference value delta Ta between the environment temperature and an environment temperature reference threshold value; and the difference value delta Tout between the refrigerant outlet temperature of the indoor heat exchanger and the refrigerant outlet temperature reference threshold value and the difference value delta F between the compressor frequency and the compressor reference frequency are introduced, the environment temperature adjusting coefficient is introduced, and the refrigerant outlet temperature adjusting coefficient and the compressor frequency adjusting coefficient are combined with the difference values to correct the rotating speed of the draught fan. Three-dimensional dynamic compensation of the rotating speed of the draught fan is achieved by integrating multiple parameters, the load requirement is accurately matched, and the method is widely suitable for the environment of nonlinear and sudden change working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump air conditioners, in particular to a heat pump air conditioner system with stepless speed regulation control of a fan. Background Art

[0002] The fan of an air-source heat pump is typically located near the outdoor unit's heat exchanger (evaporator / condenser). In heating mode, the fan drives air through the evaporator, absorbing heat from the outside. In cooling mode, the fan drives air through the condenser, removing heat from the system. During low loads, reducing the fan speed reduces energy consumption. During high loads, increasing the fan speed enhances heat dissipation and prevents overheating.

[0003] However, in the prior art, the use of a fixed speed of the fan may result in insufficient heat dissipation (affecting efficiency) or excessive heat dissipation (wasting electricity). Summary of the Invention

[0004] Based on this, the purpose of the present invention is to overcome the defects or shortcomings of the prior art and provide a heat pump air conditioning system with stepless speed control of the fan.

[0005] A heat pump air conditioning system with stepless fan speed control includes a compressor, a reversing four-way valve, an outdoor heat exchanger, a throttling assembly, and an indoor heat exchanger connected in sequence by a refrigerant circulation pipeline, and a fan arranged near the outdoor heat exchanger, a first temperature sensor for detecting the outdoor ambient temperature, a second temperature sensor arranged on the refrigerant pipeline from the indoor heat exchanger to the throttling assembly, a third temperature sensor arranged on the refrigerant pipeline from the indoor heat exchanger to the compressor, and a controller, wherein the first temperature sensor, the second temperature sensor, the third temperature sensor, the compressor, the reversing four-way valve, and the controller are electrically connected or communicatively connected, and the controller adjusts the operating speed of the fan by the following method:

[0006] Get the actual fan speed r, compressor frequency F, ambient temperature Ta and refrigerant outlet temperature Tout of the indoor heat exchanger at the current moment, and calculate the ambient temperature Ta and ambient temperature reference threshold The difference between ΔT a , and the refrigerant outlet temperature Tout of the indoor heat exchanger and the refrigerant outlet temperature reference threshold The difference between ΔT out , and the difference ΔF between the compressor frequency F and the compressor reference frequency F0, and through the difference ΔT a , difference ΔT out The actual fan speed r is corrected by the sum of the difference ΔF to obtain the fan speed R, and the fan is controlled to operate at the fan speed R.

[0007] Compared with the existing technology, the present invention integrates multiple parameters to achieve three-dimensional dynamic compensation of the fan speed, accurately matches the load requirements, and is widely applicable to nonlinear and sudden working conditions.

[0008] In one embodiment, the actual fan speed r is corrected by the following formula to obtain the fan speed R, and the fan is controlled to operate at the fan speed R:

[0009] R=r+AH×ΔT a +BH×ΔT out +CH×ΔF

[0010] Among them, AH is the ambient temperature adjustment coefficient, and its value range is [-10, 0) ∪ (0, 10]; BH is the refrigerant outlet temperature adjustment coefficient, and its value range is [-10, 0) ∪ (0, 10]; CH is the compressor frequency adjustment coefficient, and its value range is (0, 10].

[0011] In one embodiment, a value range of the compressor frequency adjustment coefficient CH is determined according to the load operation condition of the compressor, including: if the compressor is operating at a low load, then when 0 Hz < ΔF ≤ 25 Hz, the value range of the compressor frequency adjustment coefficient CH is (0, 1]; if the compressor is operating at a normal load, then when 25 Hz < ΔF ≤ 45 Hz, the value range of the compressor frequency adjustment coefficient CH is (1, 3); if the compressor is operating at a high load, then when 45 Hz < ΔF, the value range of the compressor frequency adjustment coefficient CH is (3, 10].

[0012] In one embodiment, when the system is in heating mode, the range of the ambient temperature adjustment coefficient AH and the refrigerant outlet temperature adjustment coefficient BH is [-10, 0).

[0013] In one embodiment, when the system is in cooling mode, the ambient temperature adjustment coefficient AH and the refrigerant outlet temperature adjustment coefficient BH have a value range of (0, 10].

[0014] In one embodiment, when the system is in heating mode, the range of the ambient temperature adjustment coefficient AH is determined according to the working conditions of the fan, including:

[0015] If the fan is in ultra-low temperature condition, that is, when ΔT a When the temperature is ≤-20℃, the range of the ambient temperature adjustment coefficient AH is [-10, -7];

[0016] If the fan is in low temperature condition, that is, when -20℃<ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (-7, -3);

[0017] If the fan is in normal temperature or high temperature condition, that is, when 0℃<ΔT aWhen the ambient temperature adjustment coefficient AH is in the range of [-3,0).

[0018] In one embodiment, when the system is in cooling mode, the range of the ambient temperature adjustment coefficient AH is determined according to the working conditions of the fan, including:

[0019] If the fan is in low temperature condition, that is, when ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (0,3];

[0020] If the fan is in normal temperature condition, that is, when 0℃<ΔT a When the temperature is ≤10℃, the range of the ambient temperature adjustment coefficient AH is (3,7);

[0021] If the fan is in high temperature condition, that is, when 10℃<ΔT a When , the value range of the ambient temperature adjustment coefficient AH is [7,10].

[0022] In one embodiment, the ambient temperature reference threshold The value is 20°C, and the compressor reference frequency F0 is 30Hz.

[0023] In one embodiment, when the system is in heating mode, the refrigerant outlet temperature reference threshold The value is 50℃.

[0024] In one embodiment, when the system is in cooling mode, the refrigerant outlet temperature reference threshold The value is -50℃.

[0025] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of the heat pump air conditioning system provided by the present invention;

[0027] Figure 2 This is a flow chart of the method for stepless speed regulation of a fan provided by the present invention. DETAILED DESCRIPTION

[0028] The solution of the present invention is described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a heat pump air-conditioning system 10 with stepless speed control of a fan of the present invention includes a compressor 11, a reversing four-way valve 12, an outdoor heat exchanger 13, a throttling component 14 and an indoor heat exchanger 15, which are connected in sequence by a refrigerant circulation pipeline, and a fan 16 arranged near the outdoor heat exchanger 13.

[0030] Specifically, the compressor 11 can be either a fixed-frequency compressor or a variable-frequency compressor; the outdoor heat exchanger 13 is arranged outdoors, and it is an air source heat exchanger, and the refrigerant flows through the outdoor heat exchanger 13 to exchange heat with the external air; the indoor heat exchanger 15 is arranged indoors, and it is an air source heat exchanger used for indoor cooling or heating, and the refrigerant flows through the indoor heat exchanger 15 to exchange heat with the indoor air.

[0031] As shown in the figure, in the cooling mode, the refrigerant passes through the compressor 11, the reversing four-way valve 12, the outdoor heat exchanger 13, the throttling component 14 and the indoor heat exchanger 15 in sequence, and the fan 16 drives the external air to flow through the outdoor heat exchanger 13. At this time, the outdoor heat exchanger 13 acts as a condenser to discharge the system heat; in the heating mode, the refrigerant passes through the compressor 11, the reversing four-way valve 12, the indoor heat exchanger 15, the throttling component 14 and the outdoor heat exchanger 13 in sequence, and the fan 16 drives the external air to flow through the outdoor heat exchanger 13. At this time, the outdoor heat exchanger 13 acts as an evaporator to absorb ambient heat.

[0032] The heat pump system 10 also includes a first temperature sensor 17 for detecting the outdoor ambient temperature, and a second temperature sensor 18 and a third temperature sensor 19 respectively arranged on the refrigerant pipes at both ends of the indoor heat exchanger 15, wherein the second temperature sensor 18 is arranged on the refrigerant pipe from the indoor heat exchanger 15 to the throttling component 14, and the third temperature sensor 19 is arranged on the refrigerant pipe from the indoor heat exchanger 15 to the compressor 11.

[0033] Specifically, the position of the first temperature sensor 17 is not specifically limited in the present invention, and is only used to collect the external ambient temperature of the outdoor heat exchanger 13 to obtain the ambient temperature Ta.

[0034] Specifically, the second temperature sensor 18 is arranged on the refrigerant pipeline from the indoor heat exchanger 15 to the throttling component 14 to obtain the refrigerant outlet temperature Tout of the indoor heat exchanger in the heating mode; the third temperature sensor 19 is arranged on the refrigerant pipeline from the indoor heat exchanger 15 to the compressor 11 to obtain the refrigerant outlet temperature Tout of the indoor heat exchanger in the cooling mode.

[0035] Specifically, a controller is further included, and the first temperature sensor 17 , the second temperature sensor 18 , the third temperature sensor 19 , the compressor 11 , and the reversing four-way valve 12 are electrically connected or communicatively connected to the controller.

[0036] like Figure 2 As shown, the controller controls the speed of the fan in the following manner:

[0037] S10 obtains the status of the reversing four-way valve and determines the working mode of the system at this time:

[0038] If it is heating mode, execute step S20;

[0039] If it is cooling mode, execute step S30.

[0040] S20 obtains the actual fan speed r, compressor frequency F, ambient temperature Ta and refrigerant outlet temperature Tout of the indoor heat exchanger at the current moment, and calculates the ambient temperature Ta and the ambient temperature reference threshold The difference between ΔT a , and the refrigerant outlet temperature Tout of the indoor heat exchanger and the refrigerant outlet temperature reference threshold The difference between ΔT out , and the difference ΔF between the compressor frequency F and the compressor reference frequency F0, and the fan speed is corrected by the following formula to obtain the fan speed R, and the fan is controlled to work at the fan speed R:

[0041] R=r+AH×ΔT a +BH×ΔT out +CH×ΔF

[0042] Among them, AH is the ambient temperature adjustment coefficient, and its value range is [-10, 0); BH is the refrigerant outlet temperature adjustment coefficient, and its value range is [-10, 0); CH is the compressor frequency adjustment coefficient, and its value range is (0, 10).

[0043] The value range of the compressor frequency adjustment coefficient CH is determined according to the load operation of the compressor, including:

[0044] If the compressor is running at low load, then when 0Hz<ΔF≤25Hz, the value range of the compressor frequency adjustment coefficient CH is (0,1];

[0045] If the compressor is operating under normal load, then when 25Hz<ΔF≤45Hz, the value range of the compressor frequency adjustment coefficient CH is (1,3);

[0046] If the compressor is running at high load, then when 45Hz<ΔF, the value range of the compressor frequency adjustment coefficient CH is (3,10].

[0047] Among them, the value range of the ambient temperature adjustment coefficient AH is determined according to the working conditions of the fan. When the system is in heating mode, ΔT a Less than or equal to 0, so only ultra-low temperature conditions and low temperature conditions are considered, which specifically include:

[0048] If the fan is in ultra-low temperature condition, that is, when ΔT a When the temperature is ≤-20℃, the range of the ambient temperature adjustment coefficient AH is [-10, -7];

[0049] If the fan is in low temperature condition, that is, when -20℃<ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (-7, -3);

[0050] If the fan is in normal temperature or high temperature condition, that is, when 0℃<ΔT a When the ambient temperature adjustment coefficient AH is in the range of [-3,0).

[0051] In this embodiment, the ambient temperature reference threshold The value is 20℃, the reference threshold of the refrigerant outlet temperature The value is 50° C., and the compressor reference frequency F0 is 30 Hz.

[0052] S30 obtains the actual fan speed r, compressor frequency F, ambient temperature Ta and refrigerant outlet temperature Tout of the indoor heat exchanger at the current moment, and calculates the ambient temperature Ta and the ambient temperature reference threshold The difference between ΔT a , and the refrigerant outlet temperature Tout of the indoor heat exchanger and the refrigerant outlet temperature reference threshold The difference between ΔT out , and the difference ΔF between the compressor frequency F and the compressor reference frequency F0, and the fan speed is corrected by the following formula to obtain the fan speed R, and the fan is controlled to work at the fan speed R:

[0053] R=r+AH×ΔT a +BH×ΔT out +CH×ΔF

[0054] Among them, AH is the ambient temperature adjustment coefficient, and its value range is (0,10]; BH is the refrigerant outlet temperature adjustment coefficient, and its value range is (0,10]; CH is the compressor frequency adjustment coefficient, and its value range is (0,10].

[0055] The value range of the compressor frequency adjustment coefficient CH is determined according to the load operation of the compressor, including:

[0056] If the compressor is running at low load, then when 0Hz<ΔF≤25Hz, the value range of the compressor frequency adjustment coefficient CH is (0,1];

[0057] If the compressor is operating under normal load, then when 25Hz<ΔF≤45Hz, the value range of the compressor frequency adjustment coefficient CH is (1,3);

[0058] If the compressor is running at high load, then when 45Hz<ΔF, the value range of the compressor frequency adjustment coefficient CH is (3,10].

[0059] When the system is in cooling mode, the range of the ambient temperature adjustment coefficient AH is determined according to the working conditions of the fan, including:

[0060] If the fan is in low temperature condition, that is, when ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (0,3];

[0061] If the fan is in normal temperature condition, that is, when 0℃<ΔT a When the temperature is ≤10℃, the range of the ambient temperature adjustment coefficient AH is (3,7);

[0062] If the fan is in high temperature condition, that is, when 10℃<ΔT a When , the value range of the ambient temperature adjustment coefficient AH is [7,10].

[0063] In this embodiment, the ambient temperature reference threshold The value is 20℃, the reference threshold of the refrigerant outlet temperature The value is -50°C, and the compressor reference frequency F0 is 30Hz.

[0064] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" refers to two or more; the terms "first", "second", "third", etc. are only used to distinguish, and are not used to describe a specific order or sequence, nor can they be understood to indicate or imply relative importance. The term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0065] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A heat pump air conditioning system with stepless fan speed control, comprising a compressor, a reversing four-way valve, an outdoor heat exchanger, a throttling assembly and an indoor heat exchanger connected in sequence by a refrigerant circulation pipeline, and a fan arranged on one side of the outdoor heat exchanger, and a first temperature sensor for detecting the outdoor ambient temperature, and a second temperature sensor arranged on the refrigerant pipeline from the indoor heat exchanger to the throttling assembly, and a third temperature sensor arranged on the refrigerant pipeline from the indoor heat exchanger to the compressor, and a controller, wherein the first temperature sensor, the second temperature sensor, the third temperature sensor, the compressor, the reversing four-way valve and the controller are electrically connected or communicatively connected, characterized in that: The controller adjusts the operating speed of the fan in the following way: Get the actual fan speed r, compressor frequency F, ambient temperature Ta and refrigerant outlet temperature Tout of the indoor heat exchanger at the current moment, and calculate the ambient temperature Ta and ambient temperature reference threshold The difference between ΔT a , and the refrigerant outlet temperature Tout of the indoor heat exchanger and the refrigerant outlet temperature reference threshold The difference between ΔT out , and the difference ΔF between the compressor frequency F and the compressor reference frequency F0, and through the difference ΔT a , difference ΔT out The actual fan speed r is corrected by the sum of the difference ΔF to obtain the fan speed R, and the fan is controlled to operate at the fan speed R.

2. The heat pump air conditioning system according to claim 1, characterized in that: The actual fan speed r is corrected by the following formula to obtain the fan speed R: R=r+AH×ΔT a +BH×ΔT out +CH×ΔF Among them, AH is the ambient temperature adjustment coefficient, and its value range is [-10, 0) ∪ (0, 10]; BH is the refrigerant outlet temperature adjustment coefficient, and its value range is [-10, 0) ∪ (0, 10]; CH is the compressor frequency adjustment coefficient, and its value range is (0, 10].

3. The heat pump air conditioning system according to claim 2, characterized in that: The value range of the compressor frequency adjustment coefficient CH is determined according to the load operation of the compressor, including: If the compressor is running at low load, then when 0Hz<ΔF≤25Hz, the value range of the compressor frequency adjustment coefficient CH is (0,1]; If the compressor is operating under normal load, then when 25Hz<ΔF≤45Hz, the value range of the compressor frequency adjustment coefficient CH is (1,3); If the compressor is running at high load, then when 45Hz<ΔF, the value range of the compressor frequency adjustment coefficient CH is (3,10].

4. The heat pump air conditioning system according to claim 2, characterized in that: When the system is in heating mode, the range of the ambient temperature adjustment coefficient AH and the refrigerant outlet temperature adjustment coefficient BH is [-10, 0).

5. The heat pump air conditioning system according to claim 2, characterized in that: When the system is in cooling mode, the range of the ambient temperature adjustment coefficient AH and the refrigerant outlet temperature adjustment coefficient BH is (0,10].

6. The heat pump air conditioning system according to claim 4, characterized in that: When the system is in heating mode, the range of the ambient temperature adjustment coefficient AH is determined according to the working conditions of the fan, including: If the fan is in ultra-low temperature condition, that is, when ΔT a When the temperature is ≤-20℃, the range of the ambient temperature adjustment coefficient AH is [-10, -7]; If the fan is in low temperature condition, that is, when -20℃<ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (-7, -3); If the fan is in normal temperature or high temperature condition, that is, when 0℃<ΔT a When the ambient temperature adjustment coefficient AH is in the range of [-3,0).

7. The heat pump air conditioning system according to claim 5, characterized in that: When the system is in cooling mode, the range of the ambient temperature adjustment coefficient AH is determined according to the fan's operating conditions, including: If the fan is in low temperature condition, that is, when ΔT a When the temperature is ≤0℃, the range of the ambient temperature adjustment coefficient AH is (0,3]; If the fan is in normal temperature condition, that is, when 0℃<ΔT a When the temperature is ≤10℃, the range of the ambient temperature adjustment coefficient AH is (3,7); If the fan is in high temperature condition, that is, when 10℃<ΔT a When , the value range of the ambient temperature adjustment coefficient AH is [7,10].

8. The heat pump air conditioning system according to any one of claims 1 to 7, characterized in that: The ambient temperature reference threshold The value is 20°C, and the compressor reference frequency F0 is 30Hz.

9. The heat pump air conditioning system according to any one of claims 1, 2, 3, 4, and 6, when the system is in heating mode, is characterized in that: The refrigerant outlet temperature reference threshold The value is 50℃.

10. The heat pump air conditioning system according to any one of claims 1, 2, 3, 4, and 7, when the system is in cooling mode, is characterized in that: The refrigerant outlet temperature reference threshold The value is -50℃.

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