WO2015006925A1

WO2015006925A1 - Air-supplying enthalpy-adding air-conditioning system and control method therefor

Info

Publication number: WO2015006925A1
Application number: PCT/CN2013/079473
Authority: WO
Inventors: 冯利伟; 李傲寒; 韦振斌
Original assignee: 广东美芝制冷设备有限公司
Priority date: 2013-07-16
Filing date: 2013-07-16
Publication date: 2015-01-22

Abstract

Disclosed are an air-supplying enthalpy-adding air-conditioning system and a control method therefor. The system comprises a compressor (1), an indoor heat exchanger (7), an electronic expansion valve (4), and an outdoor heat exchanger (3). The control method comprises the following steps: detecting a temperature Td of an exhaust port of a compressor (1), a temperature Ts of an air suction port of the compressor (1) and a temperature T3 of an outdoor heat exchanger in n preset periods in real time; calculating an air suction superheat degree ΔT of the compressor (1) in an n^th preset period according to the Ts and the T3; obtaining a first opening degree of the electronic expansion valve (4) in an (n+1)^th preset period according to an average value of the ΔT in the n^th preset period; calculating a difference ΔTd between the average temperature Td(n-1), of the exhaust port in the (n-1)^th preset period and the average temperature Td(n) of the exhaust port in the n^th preset period, and adjusting the first opening degree of the electronic expansion valve (4) in the (n+1)^th preset period according to the difference ΔTd. The first opening degree of the electronic expansion valve in the (n+1)^th preset period is adjusted according to the difference ΔΤd. The control method enables the air-supplying enthalpy-adding air-conditioning system to operate in an optimal state, and control is accurate and convenient.

Description

Air supply and air conditioning system and control method thereof

Technical field

The invention relates to the technical field of air conditioners, in particular to a control method for an air-enhanced air-conditioning system and an air-conditioning system for supplementing air. Background technique

Since the reform and opening up, China's air-conditioning industry has developed rapidly. In the past few decades, it has become the world's second largest consumer market and the largest producer of refrigerated air-conditioning equipment. The production technology level, quality and type of air-conditioning have made great progress. An increasingly important position in national life.

At present, people are increasingly demanding the economics and comfort of air conditioners. In the north and parts of the south, when the temperature in winter is very low, for example, minus ten degrees, the heat generation of ordinary air conditioners is relatively severe, the heat generation is not up to the requirements, and the heating effect is not ideal, which brings inconvenience to people's lives.

Although the prior art air-enhanced air conditioning system can make the air conditioner have a certain heating effect and energy efficiency ratio under low temperature conditions, the adjustment mode of the existing air-enhanced air conditioning system is adjusted by the capillary tube. Only one or two working conditions can be optimized, or the pre-opening degree of the electronic expansion valve can be adjusted according to the outdoor ambient temperature. The opening degree of the electronic expansion valve is not adjusted during the operation of the air conditioner, the control precision is low, and the operation of the air conditioner is not stable enough. The reliability is low, and the heating effect and energy efficiency ratio are not ideal enough to meet the needs of people's lives. Summary of the invention

The object of the present invention is to at least solve one of the above technical drawbacks.

To this end, an object of the present invention is to provide a control method for an air-enhanced air-conditioning system, which can make the air-enhanced air-conditioning system operate in an optimal state, and the control is accurate and convenient, and the reliability is high.

Another object of the present invention is to provide an air-enhanced air conditioning system.

In order to achieve the above object, an embodiment of the present invention provides a control method for an air-enhanced air-conditioning system, wherein the air-enhanced air-conditioning system includes a compressor, an indoor heat exchanger, The electronic expansion valve and the outdoor heat exchanger, the control method includes the following steps: S1, detecting the temperature Td of the exhaust port of the compressor or the temperature T2 of the indoor heat exchanger in n preset cycles in real time a temperature Ts of the suction port of the compressor and a temperature T3 of the outdoor heat exchanger, wherein n is a natural number greater than or equal to 2; S2, according to the temperature Ts of the suction port and the temperature of the outdoor heat exchanger T3 calculates an intake superheat degree ΔΤ of the compressor in the nth preset period, where Δ T=Ts−T3 ; S3 , according to the inhalation superheat degree ΔΤ in the nth preset period Obtaining an average value of the first opening of the electronic expansion valve in the n+1th preset period; S4, calculating an average temperature Td (n-1) of the exhaust port in the n-1th preset period a difference ATd of the average temperature Td(n) of the exhaust port in the nth preset period or an average temperature T2 of the indoor heat exchanger in the n-1th preset period (n) -1) and a difference ΔΤ2 of the average temperature T2 (n) of the indoor heat exchanger in the nth preset period, and adjusting the difference according to the difference ATd or the difference ΔΤ2 The first opening of the electronic expansion valve in the (n+1)th preset period.

According to the control method of the air-enhanced air-conditioning system according to the embodiment of the present invention, by adjusting the opening degree of the electronic expansion valve in real time during the operation of the air conditioner, the air-enhanced air-conditioning system can be operated in an optimal state and improved. Heating effect and energy efficiency ratio, high control precision and high reliability. In addition, the control method is accurate and simple to control, ensuring safe operation of air conditioners and meeting people's living needs.

In an embodiment of the present invention, the step S3 specifically includes: obtaining a first opening corresponding to an average value of the inhalation superheat degree ΔΤ according to a preset correspondence relationship between the inhalation superheat degree and the opening degree.

The preset correspondence relationship includes: when the average value of the inhalation superheat degree ΔΤ is less than or equal to the first preset temperature, the electronic expansion valve is first in the n+1th preset week The opening degree is decreased by the first preset step number in the nth preset period; when the average value of the suction superheat degree ΔΤ is greater than the first preset temperature and less than the second preset temperature The first opening degree of the electronic expansion valve in the n+1th preset period is smaller than the opening degree in the nth preset period by a second preset step, wherein The second preset temperature is greater than the first preset temperature, The second preset step number is smaller than the first preset step number; when the average value of the inhalation superheat degree ΔΤ is greater than or equal to the second preset temperature and less than or equal to a third preset temperature, the electronic The first opening of the expansion valve in the n+1th preset period is the same as the opening degree in the nth preset period, wherein the third preset temperature is greater than the second preset a temperature; when the average value of the suction superheat degree ΔΤ is greater than the third preset temperature and less than a fourth preset temperature, the electronic expansion valve is first in the n+1th preset week The opening degree is increased by a third preset step than the opening degree in the nth preset period, wherein the fourth preset temperature is greater than the third preset temperature; when the suction superheat degree ΔΤ When the average value is greater than or equal to the fourth preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset period is increased from the opening degree in the nth preset period. And the fourth preset step number is greater than the third preset step number.

The control method of the present invention sets a plurality of corresponding temperature intervals for the suction superheat degree ΔΤ, and correspondingly controls the opening degree of the electronic expansion valve when the suction superheat degree ΔΤ corresponds to different temperature intervals, thereby greatly improving the control precision and being effective. Improve the heating effect and energy efficiency ratio of the air conditioner.

Specifically, in an example of the present invention, the first preset temperature may be -4 ° C, the second preset temperature may be 0 ° C, and the third preset temperature may be 2 ° C The fourth preset temperature may be 6 ° C, the first preset step may be 10 steps, the second preset step may be 6 steps, and the third preset step may be In step 4, the fourth predetermined number of steps may be 10 steps.

In an embodiment of the present invention, the step S4 specifically includes: when the difference ATd or ΔΤ2 is greater than or equal to a temperature threshold, the electronic expansion valve in the n+1th preset period One opening degree remains unchanged; when the difference ATd or ΔΤ2 is less than the temperature threshold, the first opening degree of the electronic expansion valve in the (n+1)th preset period is adjusted to be inversely halved .

In an embodiment of the present invention, before the step S1, the method further includes: detecting an outdoor ambient temperature T4, setting a pre-opening degree of the electronic expansion valve according to the outdoor ambient temperature T4, and starting at the compressor Step S1 is performed after the preset time.

In order to achieve the above object, an air-intensifying air conditioning system according to an embodiment of another aspect of the present invention includes: a compressor including an air intake port, an exhaust port, and a gas jet port; a four-way valve, The four-way valve is respectively connected to the suction port and the exhaust port of the compressor; the outdoor heat exchanger, the outdoor heat exchanger is connected to the four-way valve; the indoor heat exchanger, the indoor heat exchange Connected to the four-way valve; a gas-liquid separator, the gas-liquid separator is connected to the indoor heat exchanger through a capillary tube, and the gas-liquid separator passes through a one-way valve and an air outlet of the compressor Connected; an electronic expansion valve, the electronic expansion valve is connected between the outdoor heat exchanger and the gas-liquid separator; a temperature detecting module for detecting the exhaust of the compressor in n preset cycles in real time; a temperature Td of the mouth or a temperature T2 of the indoor heat exchanger, a temperature Ts of the suction port of the compressor, and a temperature T3 of the outdoor heat exchanger, wherein n is a natural number greater than or equal to 2; Calculating, according to the temperature Ts of the suction port and the temperature T3 of the outdoor heat exchanger, the suction superheat degree ΔΤ of the compressor in the nth preset period, and according to the nth preset period The average value of the suction superheat degree ΔΤ is obtained at the n+th of the electronic expansion valve a first opening degree in one preset period, and an average temperature Td (n-1 ) of the exhaust port in the n-1th preset period and the row in the nth preset period a difference ATd of the average temperature Td (n) of the port or an average temperature T2 (n-1) of the indoor heat exchanger in the n-1th preset period and the nth preset period a difference ΔΤ2 of the average temperature T2 (n) of the indoor heat exchanger, and adjusting the electronic expansion valve in the n+1th preset period according to the difference ATd or the difference ΔΤ2 The first opening degree, wherein Δ T=Ts-T3.

According to the air-enhanced air-conditioning system of the embodiment of the present invention, the opening degree of the electronic expansion valve can be adjusted in real time during the operation of the air conditioner, so that the air-enhanced air-conditioning system operates in an optimal state, thereby improving the air conditioner. Heating effect and energy efficiency ratio meet people's life needs. Moreover, the air-enhanced air-conditioning system has high control precision, simple structure, and safe and reliable work.

In an embodiment of the invention, the control module obtains a first opening degree corresponding to an average value of the intake superheat degrees ΔΤ according to a preset correspondence relationship between the intake superheat degree and the opening degree.

The preset correspondence relationship includes: when the average value of the inhalation superheat degree ΔΤ is less than or equal to the first preset temperature, the electronic expansion valve is first in the n+1th preset week The opening degree is decreased by the first preset step number in the nth preset period; when the suction superheat degree is When the average value of ΔΤ is greater than the first preset temperature and less than the second preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset period is greater than the nth pre-predetermined The opening degree in the period is decreased by the second preset step, wherein the second preset temperature is greater than the first preset temperature, and the second preset step number is smaller than the first preset step number When the average value of the suction superheat degree ΔΤ is greater than or equal to the second preset temperature and less than or equal to a third preset temperature, the electronic expansion valve is in the n+1th preset period An opening degree is the same as an opening degree in the nth preset period, wherein the third preset temperature is greater than the second preset temperature; and an average value of the inhalation superheat degree ΔΤ is greater than When the third preset temperature is less than the fourth preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset period is increased than the opening degree in the nth preset period a third preset step, wherein the fourth preset temperature is greater than the third preset temperature; when the average value of the inhalation superheat degree ΔΤ is large When the fourth preset temperature is equal to, the first opening degree of the electronic expansion valve in the n+1th preset period is increased by the fourth preset in the nth preset period The number of steps, wherein the fourth preset step number is greater than the third preset step number.

By setting a plurality of corresponding temperature intervals for the suction superheat degree ΔΤ, the opening degree of the electronic expansion valve is correspondingly controlled when the suction superheat degree ΔΤ corresponds to different temperature intervals, thereby greatly improving the control precision and effectively improving the system of the air conditioner. Thermal effect and energy efficiency ratio.

In an example of the present invention, the first preset temperature may be -4 ° C, the second preset temperature may be 0 ° C, and the third preset temperature may be 2 ° C, The fourth preset temperature may be 6° C, the first preset step may be 10 steps, the second preset step may be 6 steps, and the third preset step may be 4 steps. The fourth predetermined number of steps may be 10 steps.

In an embodiment of the present invention, when the difference ATd or ΔΤ2 is greater than or equal to a temperature threshold, the control module sets the first opening of the electronic expansion valve in the (n+1)th preset period. The control module adjusts the first opening of the electronic expansion valve in the n+1th preset period to a reverse subtraction when the difference ATd or ΔΤ2 is less than the temperature threshold. half.

Specifically, in an embodiment of the present invention, the temperature detecting module includes: a first temperature a first temperature sensor disposed at an exhaust pipe of the compressor to detect a temperature Td of an exhaust port of the compressor; a second temperature sensor, the second temperature sensor being disposed at the compressor a suction pipe to detect a temperature Ts of an intake port of the compressor; a third temperature sensor disposed on a coil of the outdoor heat exchanger to detect the outdoor heat exchanger a temperature T3; and a fourth temperature sensor disposed on the coil of the indoor heat exchanger to detect the temperature T2 of the indoor heat exchanger.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a flow chart showing a control method of an air-enhanced air conditioning system according to an embodiment of the present invention;

2 is a flow chart showing a control method of a gas-filled air conditioning system according to another embodiment of the present invention;

3 is a schematic structural view of an air-enhanced air conditioning system according to an embodiment of the present invention.

Reference mark:

Compressor 1, four-way valve 2, outdoor heat exchanger 3, electronic expansion valve 4, gas-liquid separator 5, capillary 6, indoor heat exchanger 7 and check valve 8.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in different examples. This repetition is for the purpose of brevity and clarity and does not in itself indicate the relationship between the various embodiments and/or arrangements discussed. Moreover, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials. Additionally, the structure of the first feature described below "on" the second feature may include embodiments in which the first and second features are formed in direct contact, and may include additional features formed between the first and second features. The embodiment, such that the first and second features may not be in direct contact.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, mechanically or electrically connected, or The internal communication of the components may be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms may be understood according to specific situations.

These and other aspects of the embodiments of the present invention will be apparent from the description and appended claims. In the description and drawings, specific embodiments of the embodiments of the invention are disclosed This limit. Rather, the invention is to cover all modifications, modifications and equivalents within the spirit and scope of the appended claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a control method of an air-enhanced air-conditioning system and an air-enhanced air-conditioning system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a flow chart of a control method of a gas-filled air conditioning system according to an embodiment of the present invention. Among them, the air-enhanced air conditioning system includes a compressor, an indoor heat exchanger, an electronic expansion valve, and an outdoor heat exchanger. As shown in FIG. 1 , the control method of the air supply and air conditioning system includes the following steps: S1, detecting the temperature Td of the exhaust port of the compressor in n preset cycles in real time, and sucking the compressor The temperature Ts of the port and the temperature T3 of the outdoor heat exchanger, where n is a natural number greater than or equal to 2. Each preset period may be 30 s, that is, 30 s is a loop detection period.

52. Calculate the suction superheat degree ΔΤ of the compressor in the nth preset period according to the temperature Ts of the intake port and the temperature T3 of the outdoor heat exchanger, wherein AT=Ts-T3.

53. Obtain a first opening degree of the electronic expansion valve in the n+1th preset period according to an average value of the suction superheat degree ΔΤ in the nth preset period.

In an embodiment of the present invention, step S3 specifically includes: obtaining a first opening degree corresponding to an average value of the inhalation superheat degree ΔΤ according to a preset correspondence relationship between the inhalation superheat degree and the opening degree.

The preset correspondence relationship includes: when the average value of the intake superheat degree ΔΤ is less than or equal to the first preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset week is greater than the nth preset The opening degree in the cycle is decreased by the first predetermined number of steps; when the average value of the suction superheat degree ΔΤ is greater than the first preset temperature and less than the second preset temperature, the electronic expansion valve is at the n+1th preset week The first opening degree is smaller than the opening degree in the nth preset period by a second preset step, wherein the second preset temperature is greater than the first preset temperature, and the second preset step is smaller than the first preset Setting the number of steps; when the average value of the suction superheat degree ΔΤ is greater than or equal to the second preset temperature and less than or equal to the third preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset week The opening degree is the same in the n preset periods, wherein the third preset temperature is greater than the second preset temperature; when the average value of the suction superheat degree ΔΤ is greater than the third preset temperature and less than the fourth preset temperature, the electron The first opening of the expansion valve in the n+1th preset period is greater than the opening in the nth preset period And adding a third preset step, wherein the fourth preset temperature is greater than the third preset temperature; when the average value of the intake superheat degree ΔΤ is greater than or equal to the fourth preset temperature, the electronic expansion valve is at the n+1th pre-pre The first opening degree in the week is increased by a fourth preset step than the opening degree in the nth preset period, wherein the fourth preset step number is greater than the third preset step number.

Specifically, in an example of the present invention, the first preset temperature may be -4 ° C, the second preset temperature may be 0 ° C, and the third preset temperature may be 2 ° C, the fourth preset temperature It can be 6 ° C, the first preset step can be 10 steps, the second preset step can be 6 steps, the third preset step can be 4 steps, and the fourth preset step can be 10 steps. That is to say, the average value of the suction superheat ΔΤ can correspond to five temperature intervals, namely (-∞, —4], (-4, 0), [0, 2], (2, 6) and [6, +∞).

Therefore, the control method of the present invention can control the opening degree of the electronic expansion valve correspondingly when the suction superheat degree ΔΤ corresponds to different temperature intervals by setting a plurality of corresponding temperature intervals for the suction superheat degree ΔΤ, thereby greatly improving the control. Accuracy, effectively improve the heating effect and energy efficiency ratio of the air conditioner.

S4, calculating a difference ATd between the average temperature Td (n-1 ) of the exhaust port in the n-1th preset period and the average temperature Td (n) of the exhaust port in the nth preset period, and according to the difference The value ATd adjusts the first opening of the electronic expansion valve in the n+1th preset period.

The step S4 specifically includes: when the difference ATd is greater than or equal to the temperature threshold, the first opening degree of the electronic expansion valve in the n+1th preset period is kept unchanged; when the difference ATd is less than the temperature threshold, The first opening degree of the electronic expansion valve in the n+1th preset period is adjusted to be reversed in half. In one example of the invention, the temperature threshold can be 0.5 °C.

In the embodiment of the present invention, it should be noted that the reverse halving may specifically be: when the first opening degree of the electronic expansion valve in the nth preset period is increased by 10 steps, since the exhaust of the compressor is detected When the temperature drops, that is, when the ATd is less than 0.5 ° C, the first opening degree of the electronic expansion valve in the n+1th preset period is adjusted to be reduced by 5 steps.

Therefore, it can be understood that, in the embodiment of the present invention, each cycle is judged according to the average value of ΔΤ measured in the previous cycle and the average value of the temperature of the exhaust port of the compressor, and the air conditioner is actually operated. During the process, the ambient temperature is dynamically changed, and the adjustment is also carried out continuously, so that the air-enhanced air-conditioning system is operating at an optimum state.

In this embodiment, before the step S1, the control method of the present invention further includes: detecting the outdoor ambient temperature T4, setting the pre-opening degree of the electronic expansion valve according to the outdoor ambient temperature T4, and performing the step after the compressor starts the preset time. Sl. The preset time can be 3-5 minutes, that is, the air conditioning system is not adjusted within 3-5 minutes after the compressor is started, but the other protection of the air conditioner is effective.

In another embodiment of the present invention, as shown in FIG. 2, the above air-enhanced air conditioning system The control method includes the following steps:

521, real-time detecting the temperature of the indoor heat exchanger in the preset period of T2, the temperature Ts of the suction port of the compressor, and the temperature T3 of the outdoor heat exchanger, where n is a natural number greater than or equal to 2.

522. Calculate the suction superheat degree ΔΤ of the compressor in the nth preset period according to the temperature Ts of the intake port and the temperature T3 of the outdoor heat exchanger, wherein AT=Ts-T3.

523. Obtain a first opening degree of the electronic expansion valve in the n+1th preset period according to an average value of the suction superheat degree ΔΤ in the nth preset period.

524, calculating a difference ΔΤ2 between the average temperature T2 (n-1) of the indoor heat exchanger in the n-1th preset period and the average temperature T2 (n) of the indoor heat exchanger in the nth preset period, and The first opening degree of the electronic expansion valve in the (n+1)th preset period is adjusted according to the difference ΔT2.

In step S24, when the difference ΔΤ2 is greater than or equal to the temperature threshold, the first opening degree of the electronic expansion valve in the n+1th preset period is kept unchanged; when the difference ΔΤ2 is smaller than the temperature threshold, the number n is The first opening degree of the electronic expansion valve in the +1 preset period is adjusted to be reversed in half.

In the control method of the present embodiment, the electronic expansion valve opening degree is adjusted by using the temperature T2 of the indoor heat exchanger instead of Td as the determination condition, and the method requires the T2 to have a positive relationship with the performance of the air conditioner, that is, when the T2 is increased. The performance of the air conditioner is increased, and when the T2 is decreased, the performance of the air conditioner is reduced.

In the embodiment, before the step S21, the method further includes: detecting the outdoor ambient temperature T4, setting the pre-opening degree of the electronic expansion valve according to the outdoor ambient temperature T4, and performing step S21 after the compressor starts the preset time.

3 is a schematic structural view of an air-enhanced air conditioning system according to an embodiment of the present invention. Figure 3 As shown, the air-enhanced air conditioning system includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, a gas-liquid separator 5, a capillary 6, an indoor heat exchanger 7, and a check valve 8. .

The compressor 1 includes an intake port 11, an exhaust port 12, and a gas jet port 13. The S end of the four-way valve 2 is connected to the suction port 11 of the compressor, and the D end of the four-way valve 2 is connected to the exhaust port 12. The outdoor heat exchanger 3 is connected to the C end of the four-way valve, the indoor heat exchanger 7 is connected to the E end of the four-way valve 2, and the gas-liquid separator 5 is connected to the indoor heat exchanger 7 through the capillary 6, and the gas-liquid separation The device 5 is connected to the air outlet 13 of the compressor 1 via a check valve 8, for example, a one-way solenoid valve, and the electronic expansion valve 4 is connected between the outdoor heat exchanger 3 and the gas-liquid separator 5. The temperature detecting module (not shown) is for detecting the temperature Td of the exhaust port 12 of the compressor 1 or the temperature T2 of the indoor heat exchanger 7 in the n preset cycles in real time, and the intake port 11 of the compressor 1 The temperature Ts and the temperature T3 of the outdoor heat exchanger 3, where n is a natural number greater than or equal to 2. a control module (not shown) for calculating the suction superheat degree ΔΤ of the compressor 1 in the nth preset period according to the temperature Ts of the intake port 11 and the temperature T3 of the outdoor heat exchanger 3, and according to the The average value of the intake superheat degree ΔΤ in the n preset periods is obtained as the first opening degree of the electronic expansion valve 4 in the n+1th preset period, and the exhaust port 12 is calculated in the n-1th preset period. The difference between the average temperature Td (nl ) and the average temperature Td(n) of the exhaust port 12 in the nth preset period or the average temperature T2 of the indoor heat exchanger 7 in the n-1th predetermined period ( N-1) and the difference ΔΤ2 of the average temperature Τ2 (η) of the indoor heat exchanger 7 in the nth preset period, and adjusting the electronic expansion valve 4 at the n+1th preset according to the difference ATd or the difference ΔΤ2 Let the first opening degree in the period, where AT=Ts-T3, ΔΤά= Td (n) - Td (n-1 ), ΔΤ2= T2 (n) - T2 (n-1 ).

In one embodiment of the present invention, the control module obtains a first opening degree corresponding to an average value of the intake superheat degree ΔΤ according to a preset correspondence relationship between the intake superheat degree and the opening degree.

The preset correspondence relationship includes: when the average value of the intake superheat degree ΔΤ is less than or equal to the first preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset week is greater than the nth preset The opening degree in the cycle is decreased by the first predetermined number of steps; when the average value of the suction superheat degree ΔΤ is greater than the first preset temperature and less than the second preset temperature, the electronic expansion valve is at the n+1th preset week First opening Reducing the opening degree in the nth preset period by a second preset step, wherein the second preset temperature is greater than the first preset temperature, and the second preset step is less than the first preset step; When the average value of the air superheat degree ΔΤ is greater than or equal to the second preset temperature and less than or equal to the third preset temperature, the electronic expansion valve is within the first opening degree and the nth preset period in the n+1th preset week The opening degree is the same, wherein the third preset temperature is greater than the second preset temperature; when the average value of the suction superheat degree ΔΤ is greater than the third preset temperature and less than the fourth preset temperature, the electronic expansion valve is at the n+th The first opening degree in one preset week is increased by the third predetermined step number in the opening period in the nth preset period, wherein the fourth preset temperature is greater than the third preset temperature; when the inhalation superheat degree ΔΤ When the average value is greater than or equal to the fourth preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset period is increased by the fourth predetermined step number in the nth preset period, wherein The fourth preset step number is greater than the third preset step number.

In an example of the present invention, the first preset temperature may be -4 ° C, the second preset temperature may be 0 ° C, the third preset temperature may be 2 ° C, and the fourth preset temperature may be 6 ° °C, the first preset step number may be 10 steps, the second preset step number may be 6 steps, the third preset step number may be 4 steps, and the fourth preset step number may be 10 steps.

Further, in an embodiment of the present invention, when the difference ATd or ΔΤ2 is greater than or equal to a temperature threshold, for example, 0.5 ° C, the control module maintains the first opening of the electronic expansion valve in the n+1th preset period. The control module adjusts the first opening of the electronic expansion valve in the n+1th preset period to a reverse halving when the difference ATd or ΔΤ2 is less than the temperature threshold.

Specifically, in an embodiment of the invention, the temperature detecting module includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. Wherein, the first temperature sensor is disposed in the exhaust pipe of the compressor to detect the temperature Td of the exhaust port of the compressor, and the second temperature sensor is disposed in the intake pipe of the compressor to detect the temperature Ts of the intake port of the compressor, The third temperature sensor is disposed on the coil of the outdoor heat exchanger to detect the temperature T3 of the outdoor heat exchanger, the fourth temperature The degree sensor is disposed on the coil of the indoor heat exchanger to detect the temperature T2 of the indoor heat exchanger.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer readable medium, Used in conjunction with, or in conjunction with, an instruction execution system, apparatus, or device (eg, a computer-based system, a system including a processor, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Or use with equipment. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). Furthermore, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method proceeds to obtain the program electronically and then store it in computer memory. It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented with any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals Discrete logic circuit, ASIC with suitable combination logic gate, programmable gate array

(PGA), Field Programmable Gate Array (FPGA), etc.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art The scope of the invention is defined by the appended claims and their equivalents.

Claims

claims

1. A control method for an air-supplementing and enthalpy-increasing air conditioning system, characterized in that the air-supplementing and enthalpy-increasing air conditioning system includes a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger, and the control method includes the following Steps:

S1, detect in real time the temperature Td of the exhaust port of the compressor or the temperature T2 of the indoor heat exchanger, the temperature Ts of the suction port of the compressor and the outdoor heat exchanger within n preset periods. The temperature T3 , where n is a natural number greater than or equal to 2;

52. Calculate the suction superheat degree ΔΤ of the compressor in the n-th preset period according to the temperature Ts of the suction port and the temperature T3 of the outdoor heat exchanger, where AT=Ts-T3;

53. Obtain the first opening degree of the electronic expansion valve in the n+1th preset period based on the average value of the suction superheat degree ΔT in the nth preset period;

54. Calculate the difference between the average temperature Td (n-1) of the exhaust port in the n-1 preset period and the average temperature Td (n) of the exhaust port in the n-th preset period. The value ATd or the average temperature T2 (n-1) of the indoor heat exchanger in the n-1 preset period and the average temperature T2 (n-1) of the indoor heat exchanger in the n-th preset period n) the difference ΔT2, and adjust the first opening of the electronic expansion valve in the n+1th preset period according to the difference ATd or the difference ΔT2.

2. The control method according to claim 1, characterized in that step S3 specifically includes:

The first opening degree corresponding to the average value of the intake air superheat degree ΔT is obtained according to the preset corresponding relationship between the intake air superheat degree and the opening degree.

3. The control method according to claim 2, characterized in that the preset correspondence includes:

When the average value of the suction superheat degree ΔT is less than or equal to the first preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset cycle is larger than the nth preset temperature. opening within the cycle Reduce the first preset number of steps;

When the average value of the suction superheat degree ΔT is greater than the first preset temperature and less than the second preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset cycle The second preset number of steps is reduced from the opening in the nth preset period, wherein the second preset temperature is greater than the first preset temperature, and the second preset number of steps is less than the The first preset number of steps;

When the average value of the suction superheat degree ΔT is greater than or equal to the second preset temperature and less than or equal to the third preset temperature, the electronic expansion valve operates at the first time in the n+1th preset cycle. The opening degree is the same as the opening degree in the n-th preset period, wherein the third preset temperature is greater than the second preset temperature;

When the average value of the suction superheat degree ΔT is greater than the third preset temperature and less than the fourth preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset cycle Increase the third preset number of steps from the opening in the n-th preset period, wherein the fourth preset temperature is greater than the third preset temperature;

When the average value of the suction superheat degree ΔT is greater than or equal to the fourth preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset cycle is larger than the nth The opening within the preset period increases by a fourth preset number of steps, wherein the fourth preset number of steps is greater than the third preset number of steps.

4. The control method according to claim 3, characterized in that, the first preset temperature is -4°C, the second preset temperature is 0°C, and the third preset temperature is 2 °C, the fourth preset temperature is 6°C, the first preset number of steps is 10 steps, the second preset number of steps is 6 steps, and the third preset number of steps is 4 steps , the fourth preset number of steps is 10 steps.

5. The control method according to any one of claims 1 to 3, characterized in that the step S4 specifically includes:

When the difference ATd or ΔT2 is greater than or equal to the temperature threshold, the first opening of the electronic expansion valve in the n+1 preset period remains unchanged;

When the difference ATd or ΔT2 is less than the temperature threshold, the n+1th preset The first opening degree of the electronic expansion valve within the cycle is adjusted to half in reverse.

6. The control method according to any one of claims 1 to 3, characterized in that, before step S1, it also includes:

Detect the outdoor ambient temperature T4, set the pre-opening degree of the electronic expansion valve according to the outdoor ambient temperature T4, and perform step S1 after the compressor starts for a preset time.

7. An air-supply and enthalpy-increasing air conditioning system, characterized by including:

A compressor, the compressor includes a suction port, a discharge port and an injection port;

A four-way valve, the four-way valve is connected to the suction port and the exhaust port of the compressor respectively; an outdoor heat exchanger, the outdoor heat exchanger is connected to the four-way valve;

Indoor heat exchanger, the indoor heat exchanger is connected to the four-way valve;

A gas-liquid separator, the gas-liquid separator is connected to the indoor heat exchanger through a capillary tube, and the gas-liquid separator is connected to the injection port of the compressor through a one-way valve;

Electronic expansion valve, the electronic expansion valve is connected between the outdoor heat exchanger and the gas-liquid separator;

Temperature detection module, used to detect in real time the temperature Td of the exhaust port of the compressor or the temperature T2 of the indoor heat exchanger, the temperature Ts of the suction port of the compressor and the temperature of the suction port of the compressor within n preset periods. The temperature of the outdoor heat exchanger T3, where n is a natural number greater than or equal to 2;

A control module configured to calculate the suction superheat degree ΔT of the compressor in the n-th preset period based on the temperature Ts of the suction port and the temperature T3 of the outdoor heat exchanger, and calculate the suction superheat degree ΔT of the compressor according to the n-th preset period. The average value of the suction superheat degree ΔT in the n+1 preset periods is obtained to obtain the first opening of the electronic expansion valve in the n+1 preset period, and the calculation of the suction superheat degree in the n-1 preset period is The difference ATd between the average temperature Td (n-1) of the exhaust port and the average temperature Td (n) of the exhaust port in the n-th preset period or the difference ATd in the n-1 preset period The difference ΔT2 between the average temperature T2 (n-1) of the indoor heat exchanger and the average temperature T2 (n) of the indoor heat exchanger in the nth preset period, and based on the difference ATd Or the difference ΔT2 adjusts the first opening of the electronic expansion valve in the n+1th preset period, where AT=Ts-T3.

8. The air-supplementing and enthalpy-increasing air conditioning system according to claim 7, wherein the control module obtains the average value corresponding to the suction superheat degree ΔT according to the preset correspondence relationship between the suction superheat degree and the opening degree. the first opening degree.

9. The air-supplementing and enthalpy-increasing air conditioning system according to claim 8, characterized in that the preset corresponding relationships include:

When the average value of the suction superheat degree ΔT is less than or equal to the first preset temperature, the first opening degree of the electronic expansion valve in the n+1th preset cycle is larger than the nth preset temperature. The opening within the cycle decreases by the first preset number of steps;

10. The air-supplementing and enthalpy-increasing air conditioning system according to claim 9, wherein the first preset temperature is -4°C, the second preset temperature is 0°C, and the third preset temperature is -4°C. Let the temperature be 2°C, The fourth preset temperature is 6°C, the first preset number of steps is 10 steps, the second preset number of steps is 6 steps, the third preset number of steps is 4 steps, the The fourth preset number of steps is 10 steps.

11. The air-supplementing and enthalpy-increasing air conditioning system according to any one of claims 7 to 9, characterized in that,

When the difference ATd or ΔT2 is greater than or equal to the temperature threshold, the control module keeps the first opening of the electronic expansion valve unchanged in the n+1 preset period;

When the difference ATd or ΔT2 is less than the temperature threshold, the control module adjusts the first opening of the electronic expansion valve in the n+1 preset period to reverse half.

12. The air-supplementing and enthalpy-increasing air conditioning system according to any one of claims 7 to 9, characterized in that the temperature detection module includes:

A first temperature sensor, the first temperature sensor is arranged on the exhaust pipe of the compressor to detect the temperature Td of the exhaust port of the compressor;

A second temperature sensor, the second temperature sensor is arranged on the suction pipe of the compressor to detect the temperature Ts of the suction port of the compressor;

A third temperature sensor, the third temperature sensor is arranged on the coil of the outdoor heat exchanger to detect the temperature T3 of the outdoor heat exchanger; and

A fourth temperature sensor is provided on the coil of the indoor heat exchanger to detect the temperature T2 of the indoor heat exchanger.