Heat pump air conditioner with compressor frequency increasing rate control function

Abstract

The invention relates to a heat pump air conditioner with compressor frequency increasing rate control, which comprises a compressor, a four-way valve, a first heat exchanger, an electronic expansion valve, a second heat exchanger, a temperature sensor arranged on a water outlet pipe of the first heat exchanger, and a controller electrically connected with the compressor and the temperature sensor, the control method is characterized in that the controller controls the frequency increasing rate of the compressor in the following mode that the actual water outlet temperature Tr of the unit is continuously obtained, the absolute value delta T of the temperature difference between the target temperature Tset and the actual water outlet temperature Tr is calculated, and the interval where the absolute value delta T of the temperature difference is located is judged; and changing the frequency increasing rate of the compressor according to the interval of the temperature difference absolute value delta T. The control sensitivity can be improved, the time for reaching the specified frequency is shortened, the energy loss is reduced, and the overall performance and stability of the unit are improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a heat pump air conditioner with compressor frequency increase rate control. Background Art

[0002] In heat pump air conditioning systems, the compressor is a key component for achieving heat transfer and temperature regulation.

[0003] When the system starts, the compressor usually runs at a lower platform frequency (also called the starting frequency) first, and then reaches a higher or maximum operating frequency at a certain frequency increase rate. Specifically, the compressor selects multiple target operating frequencies in the frequency range formed by the current operating frequency and the maximum set frequency, and in order from small to large, the compressor is allowed to increase from the current operating frequency to each target operating frequency at a predetermined speed in sequence, and run at each target operating frequency for a predetermined time, thereby allowing the compressor to increase to the maximum target operating frequency in a step-by-step frequency increase manner.

[0004] However, when the heat load demand at the user end is large, the compressor that increases to the target operating frequency at a predetermined speed will not be able to respond quickly, so that it takes a long time to reach the target operating frequency and the user experience is poor. Summary of the invention

[0005] 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 conditioner with compressor frequency increase rate control.

[0006] A heat pump air conditioner with compressor frequency increase rate control, comprising a compressor, a four-way valve, a first heat exchanger, an electronic expansion valve, a second heat exchanger connected by a refrigerant circulation pipeline, and a temperature sensor arranged on a water outlet pipe of the first heat exchanger, and a controller electrically connected to the compressor and the temperature sensor, and other auxiliary pipes, characterized in that the controller controls the compressor frequency increase rate in the following manner:

[0007] Continuously obtain the actual outlet water temperature Tr of the unit, calculate the absolute value of the temperature difference ΔT between the target temperature Tset and the actual outlet water temperature Tr, determine the range of the absolute value of the temperature difference ΔT, and change the frequency increase rate of the compressor according to the range of the absolute value of the temperature difference ΔT.

[0008] Compared with the prior art, the heat pump air conditioner with compressor frequency increase rate control described in the present invention can improve control sensitivity, shorten the time to reach a specified frequency, reduce energy loss, and improve the overall performance and stability of the unit.

[0009] In one embodiment, the interval includes:

[0010] A first temperature difference interval, wherein the temperature difference range is greater than 0 and less than or equal to the first temperature difference value;

[0011] The second temperature difference interval has a temperature difference range greater than the first temperature difference value and less than or equal to the second temperature difference value;

[0012] A third temperature difference interval, wherein the temperature difference range is greater than the second temperature difference value and less than or equal to the third temperature difference value;

[0013] The fourth temperature difference interval has a temperature difference range greater than the third temperature difference value.

[0014] In one embodiment, the first temperature difference is 10°C, the second temperature difference is 25°C, and the third temperature difference is 40°C.

[0015] In one embodiment, the frequency increase rate of the compressor includes a first frequency increase rate, a second frequency increase rate, a third frequency increase rate and a fourth frequency increase rate;

[0016] If the absolute value of the temperature difference ΔT is within the first temperature difference range, the compressor is controlled to increase the frequency at a first frequency increase rate;

[0017] If the absolute value of the temperature difference ΔT is within the second temperature difference range, the compressor is controlled to increase the frequency at a second frequency increase rate;

[0018] If the absolute value of the temperature difference ΔT is within the third temperature difference range, the compressor is controlled to increase the frequency at a third frequency increase rate;

[0019] If the absolute value of the temperature difference ΔT is in the fourth temperature difference range, the compressor is controlled to increase the frequency at a fourth increase rate.

[0020] In one embodiment, the first frequency increase rate is 1 Hz / s; the second frequency increase rate is 3 Hz / s; the third frequency increase rate is 5 Hz / s; and the fourth frequency increase rate is 8 Hz / s.

[0021] At the same time, the present invention also provides a method for controlling the frequency increase rate of the compressor, which includes: continuously obtaining the actual water outlet temperature Tr of the unit, calculating the absolute value of the temperature difference ΔT between the target temperature Tset and the actual water outlet temperature Tr, determining the interval in which the absolute value of the temperature difference ΔT is located, and changing the frequency increase rate of the compressor according to the interval in which the absolute value of the temperature difference ΔT is located.

[0022] In one embodiment, the interval includes:

[0023] A first temperature difference interval, wherein the temperature difference range is greater than 0 and less than or equal to the first temperature difference value;

[0024] The second temperature difference interval has a temperature difference range greater than the first temperature difference value and less than or equal to the second temperature difference value;

[0025] A third temperature difference interval, wherein the temperature difference range is greater than the second temperature difference value and less than or equal to the third temperature difference value;

[0026] The fourth temperature difference interval has a temperature difference range greater than the third temperature difference value.

[0027] In one embodiment, the first temperature difference is 10°C, the second temperature difference is 25°C, and the third temperature difference is 40°C.

[0028] In one embodiment, the frequency increase rate of the compressor includes a first frequency increase rate, a second frequency increase rate, a third frequency increase rate and a fourth frequency increase rate;

[0029] If the absolute value of the temperature difference ΔT is within the first temperature difference range, the compressor is controlled to increase the frequency at a first frequency increase rate;

[0030] If the absolute value of the temperature difference ΔT is within the second temperature difference range, the compressor is controlled to increase the frequency at a second frequency increase rate;

[0031] If the absolute value of the temperature difference ΔT is within the third temperature difference range, the compressor is controlled to increase the frequency at a third frequency increase rate;

[0032] If the absolute value of the temperature difference ΔT is in the fourth temperature difference range, the compressor is controlled to increase the frequency at a fourth increase rate.

[0033] In one embodiment, the first frequency increase rate is 1 Hz / s; the second frequency increase rate is 3 Hz / s; the third frequency increase rate is 5 Hz / s; and the fourth frequency increase rate is 8 Hz / s.

[0034] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a water source cooling and heating system according to an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the structure of a control device for a compressor frequency increase rate according to an embodiment of the present invention.

[0037] Figure 3 A schematic flow chart of a compressor frequency increase rate control method according to an embodiment of the present invention;

[0038] Figure 4 The diagram is a schematic diagram of an optional hardware architecture of an electronic device including a compressor frequency increase rate control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The scheme of the present invention is described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1, is a heat pump air conditioner with compressor frequency increase rate control according to an embodiment of the present invention, which includes a compressor 11, a four-way valve 12, a first heat exchanger 13, an electronic expansion valve 14, a second heat exchanger 15, and a temperature sensor 16, and a controller (not shown), and other auxiliary pipes connected by a refrigerant circulation pipeline; wherein the controller 17 is electrically connected or communicatively connected with the compressor 11 and the temperature sensor 16;

[0041] The first heat exchanger 13 is used to release and absorb heat in the refrigerant, thereby achieving the purpose of cooling or heating the target medium, wherein the first heat exchanger 13 can be a condenser to achieve the heating function, or an evaporator to achieve the cooling function; specifically, in this embodiment, the first heat exchanger 13 is a water source heat exchanger, which uses water as the target medium and achieves heat transfer by increasing or decreasing the water temperature;

[0042] The temperature sensor 16 is arranged at the outlet after the heat transfer between water and refrigerant is completed, and is used to detect the actual water outlet temperature Tr of the system, so as to accurately characterize the cooling or heating capacity of the system;

[0043] See also Figure 2 and Figure 3 The controller includes a compressor frequency increase rate control device 20, which specifically includes an actual temperature acquisition unit 21, a temperature difference calculation unit 22, a temperature difference comparison unit 23 and a compressor frequency increase rate control unit 24.

[0044] The actual temperature acquisition unit 21 is used to execute step S10: acquiring the actual outlet water temperature Tr of the system.

[0045] The temperature difference calculation unit 22 is used to execute step 20: calculate the absolute value ΔT of the temperature difference between the target temperature Tset and the actual outlet water temperature Tr.

[0046] The temperature difference comparison unit 23 is used to execute step S30: determine the interval in which the temperature difference absolute value ΔT is located.

[0047] Specifically, when 0<the absolute value of the temperature difference ΔT≤10, the absolute value of the temperature difference ΔT is in the first temperature difference interval; when 10<the absolute value of the temperature difference ΔT≤25, the absolute value of the temperature difference ΔT is in the second temperature difference interval; when 25<the absolute value of the temperature difference ΔT≤40, the absolute value of the temperature difference ΔT is in the third temperature difference interval; when 40<the absolute value of the temperature difference ΔT, the absolute value of the temperature difference ΔT is in the fourth temperature difference interval;

[0048] The compressor frequency increase rate control unit 24 is used to execute step S40: changing the frequency increase rate of the compressor according to the interval in which the absolute value of the temperature difference ΔT is located.

[0049] Specifically, if ΔT is in the first temperature difference range, the compressor is controlled to increase the frequency at the first frequency increase rate; if ΔT is in the second temperature difference range, the compressor is controlled to increase the frequency at the second frequency increase rate; if ΔT is in the third temperature difference range, the compressor is controlled to increase the frequency at the third frequency increase rate; if ΔT is in the fourth temperature difference range, the compressor is controlled to increase the frequency at the fourth frequency increase rate;

[0050] Specifically, the first frequency increase rate is 1 Hz / s; the second frequency increase rate is 3 Hz / s; the third frequency increase rate is 5 Hz / s; and the fourth frequency increase rate is 8 Hz / s.

[0051] See also Figure 4 , is a schematic diagram of the architecture of an electronic device 30 provided with the compressor frequency increase rate control device 20 proposed by the present invention.

[0052] In this embodiment, the compressor frequency increase rate control device 20 is arranged in an electronic device 30, and the electronic device 30 specifically includes a memory 31, a processor 32, a network interface 33 and a system bus 34, wherein the memory 31, the processor 32 and the network interface 33 can communicate with each other through the system bus 34. The memory 31 includes a non-volatile storage medium and an internal memory; the non-volatile storage medium stores an operating system and a computer program; the internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The processor 32 is used to provide computing and control capabilities, and can call the logic instructions in the memory 31 to execute the compressor frequency increase rate control method; the network interface 33 is used to communicate with the outside world through a network connection.

[0053] The memory 31 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 31 can be an internal storage unit of the controller, such as a hard disk or memory of the controller. In other embodiments, the memory 31 can also be an external storage device of the controller, such as a plug-in hard disk equipped on the controller, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. The memory 31 can also include both the internal storage unit of the controller and its external storage device.

[0054] In this embodiment, the memory 31 is generally used to store the operating system and various application software installed in the control device 20, such as the program code of the control device 20. In addition, the memory 31 can also be used to temporarily store various data that have been output or will be output.

[0055] The processor 32 may be a central processing unit (CPU) microprocessor or other data processing chip in some embodiments. The processor 32 is generally used to control the overall operation of the controller, such as performing control and processing related to data interaction or communication with the controller.

[0056] In this embodiment, the processor 32 is used to run the program code or process data stored in the memory 31, such as running a method for controlling the compressor frequency increase rate in a controller in a heat pump air conditioner with compressor frequency increase rate control.

[0057] The network interface 33 may include a wireless network interface or a wired network interface, and the network interface 33 is generally used to establish a communication connection between the controller and other electronic devices. For example, the network interface 33 is used to connect the control device 20 to an external data platform through a network, and to establish a data transmission channel and a communication connection between the control device 20 and the external data platform. The network may be a wireless or wired network such as an intranet, the Internet, a global system of mobile communication (GSM), wideband code division multiple access (WCDMA), a 4G network, a 5G network, Bluetooth, Wi-Fi, etc.

[0058] Compared with the existing technology, the heat pump air conditioner with compressor frequency increase rate control can improve the control sensitivity, shorten the time to reach the specified frequency, reduce energy loss and improve the overall performance and stability of the unit.

[0059] 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, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying 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 relates 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.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A heat pump air conditioner with compressor frequency increase rate control, comprising a compressor, a four-way valve, a first heat exchanger, an electronic expansion valve, a second heat exchanger connected by a refrigerant circulation pipeline, and a temperature sensor arranged on the outlet pipe of the first heat exchanger, and a controller electrically connected to the compressor and the temperature sensor, and other auxiliary pipes, characterized in that: The controller controls the compressor frequency increase rate in the following way: Continuously obtain the actual outlet water temperature Tr of the unit, calculate the absolute value of the temperature difference ΔT between the target temperature Tset and the actual outlet water temperature Tr, determine the range of the absolute value of the temperature difference ΔT, and change the frequency increase rate of the compressor according to the range of the absolute value of the temperature difference ΔT.

2. The heat pump air conditioner with compressor frequency increase rate control according to claim 1, characterized in that: The intervals include: A first temperature difference interval, wherein the temperature difference range is greater than 0 and less than or equal to the first temperature difference value; The second temperature difference interval has a temperature difference range greater than the first temperature difference value and less than or equal to the second temperature difference value; A third temperature difference interval, wherein the temperature difference range is greater than the second temperature difference value and less than or equal to the third temperature difference value; The fourth temperature difference interval has a temperature difference range greater than the third temperature difference value.

3. The heat pump air conditioner with compressor frequency increase rate control according to claim 2, characterized in that: The first temperature difference is 10°C, the second temperature difference is 25°C, and the third temperature difference is 40°C.

4. The heat pump air conditioner with compressor frequency increase rate control according to claim 3, characterized in that: The frequency increase rate of the compressor includes a first frequency increase rate, a second frequency increase rate, a third frequency increase rate and a fourth frequency increase rate; If the absolute value of the temperature difference ΔT is within the first temperature difference range, the compressor is controlled to increase the frequency at a first frequency increase rate; If the absolute value of the temperature difference ΔT is within the second temperature difference range, the compressor is controlled to increase the frequency at a second frequency increase rate; If the absolute value of the temperature difference ΔT is within the third temperature difference range, the compressor is controlled to increase the frequency at a third frequency increase rate; If the absolute value of the temperature difference ΔT is in the fourth temperature difference range, the compressor is controlled to increase the frequency at a fourth increase rate.

5. The heat pump air conditioner with compressor frequency increase rate control according to claim 4, characterized in that: The first frequency increase rate is 1 Hz / s; the second frequency increase rate is 3 Hz / s; the third frequency increase rate is 5 Hz / s; and the fourth frequency increase rate is 8 Hz / s.

6. A method for controlling a frequency increase rate of a compressor, characterized in that: Continuously obtain the actual outlet water temperature Tr of the unit, calculate the absolute value of the temperature difference ΔT between the target temperature Tset and the actual outlet water temperature Tr, determine the range of the absolute value of the temperature difference ΔT, and change the frequency increase rate of the compressor according to the range of the absolute value of the temperature difference ΔT.

7. The method for controlling the frequency increase rate of a compressor according to claim 6, characterized in that: The intervals include: A first temperature difference interval, wherein the temperature difference range is greater than 0 and less than or equal to the first temperature difference value; The second temperature difference interval has a temperature difference range greater than the first temperature difference value and less than or equal to the second temperature difference value; A third temperature difference interval, wherein the temperature difference range is greater than the second temperature difference value and less than or equal to the third temperature difference value; The fourth temperature difference interval has a temperature difference range greater than the third temperature difference value.

8. The method for controlling the frequency increase rate of a compressor according to claim 7, characterized in that: The first temperature difference is 10°C, the second temperature difference is 25°C, and the third temperature difference is 40°C.

9. The method for controlling the frequency increase rate of a compressor according to claim 8, characterized in that: The frequency increase rate of the compressor includes a first frequency increase rate, a second frequency increase rate, a third frequency increase rate and a fourth frequency increase rate; If the absolute value of the temperature difference ΔT is within the first temperature difference range, the compressor is controlled to increase the frequency at a first frequency increase rate; If the absolute value of the temperature difference ΔT is within the second temperature difference range, the compressor is controlled to increase the frequency at a second frequency increase rate; If the absolute value of the temperature difference ΔT is within the third temperature difference range, the compressor is controlled to increase the frequency at a third frequency increase rate; If the absolute value of the temperature difference ΔT is in the fourth temperature difference range, the compressor is controlled to increase the frequency at a fourth increase rate.

10. The method for controlling the frequency increase rate of a compressor according to claim 9, characterized in that: The first frequency increase rate is 1 Hz / s; the second frequency increase rate is 3 Hz / s; the third frequency increase rate is 5 Hz / s; and the fourth frequency increase rate is 8 Hz / s.

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