CN210891940U - Outdoor unit heat exchanger, outdoor unit and variable frequency air conditioner - Google Patents
Outdoor unit heat exchanger, outdoor unit and variable frequency air conditioner Download PDFInfo
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- CN210891940U CN210891940U CN201921572167.XU CN201921572167U CN210891940U CN 210891940 U CN210891940 U CN 210891940U CN 201921572167 U CN201921572167 U CN 201921572167U CN 210891940 U CN210891940 U CN 210891940U
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Abstract
The utility model relates to an air conditioning technology field, concretely relates to outdoor unit heat exchanger, off-premises station and inverter air conditioner. The utility model discloses aim at solving the problem that the inefficiency that heats that current inverter air conditioner exists. Mesh for this reason, the utility model discloses an off-premises station heat exchanger includes heat exchange tube section, supercooling pipe section and governing valve, and the one end of supercooling pipe section is passed through the governing valve and is connected with heat exchange tube section, and the other end can be connected with indoor set heat exchanger through main capillary, and the governing valve sets to and opens when heat transfer medium flows to the off-premises station heat exchanger by indoor set heat exchanger and sets for the aperture. By the arrangement mode, when the variable frequency air conditioner heats, the opening degree of the regulating valve is changed, so that the supercooling degree is accurately controlled, the supercooling pipe section of the outdoor unit heat exchanger serves as extension and supplement of the indoor unit heat exchanger, and the heating energy consumption is greatly reduced.
Description
Technical Field
The utility model relates to an air conditioning technology field, concretely relates to outdoor unit heat exchanger, off-premises station and inverter air conditioner.
Background
The traditional inverter air conditioner only examines refrigeration energy efficiency and power, takes the refrigeration energy efficiency as an energy efficiency grade evaluation standard, and has no requirement on heating power and capacity, so that research and development personnel generally take the optimal refrigeration energy efficiency as a design principle when developing the inverter air conditioner.
However, with the development and implementation of the new national energy efficiency standard, the refrigeration power, the heating power and the energy efficiency of the inverter air conditioner are all in the examination range, and the heating energy efficiency has a great influence on the overall energy efficiency of the air conditioner, so that the heating power of the inverter air conditioner is reduced, and the heating energy efficiency of the inverter air conditioner is improved to become one of the most critical tasks in the industry at present.
Accordingly, there is a need in the art for a new outdoor unit heat exchanger, an outdoor unit and an inverter air conditioner to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned problem among the prior art, for solve the problem that the heating efficiency is low that current inverter air conditioner exists for the sake of understanding, the utility model provides an outdoor unit heat exchanger, this outdoor unit heat exchanger include heat exchange tube section, supercooling pipe section and governing valve, supercooling pipe section's one end is passed through the governing valve with heat exchange tube section connects, and the other end can be connected with indoor set heat exchanger through main capillary, the governing valve sets to as heat transfer medium by indoor set heat exchanger to open when outdoor unit heat exchanger flows and set for the aperture.
In a preferred technical solution of the outdoor heat exchanger, the outdoor heat exchanger further includes a temperature detection element disposed on the supercooling pipe section, and the temperature detection element can be connected to a controller, so that the controller adjusts the opening degree of the regulating valve based on the temperature of the supercooling pipe section collected by the temperature detection element.
In the preferable technical scheme of the outdoor heat exchanger, the supercooling pipe section is arranged on the windward side of the outdoor heat exchanger.
In the preferable technical scheme of the outdoor unit heat exchanger, the supercooling pipe section is arranged below the heat exchange pipe section.
In a preferred embodiment of the above outdoor heat exchanger, the heat exchange tube section includes a plurality of flow paths, and a cross section of each flow path includes an N-type and/or an N-type.
In the preferable technical scheme of the heat exchanger of the outdoor unit, the regulating valve is an electronic expansion valve or an electromagnetic valve.
In the preferable technical scheme of the outdoor unit heat exchanger, the heat exchange pipe sections are double rows.
The utility model also provides an outdoor unit heat exchanger, outdoor unit heat exchanger includes heat exchange pipe section, supercooling pipe section, electronic expansion valve and temperature detecting element, supercooling pipe section set up in heat exchange pipe section below just is located outdoor unit heat exchanger's windward side, supercooling pipe section's one end is passed through electronic expansion valve with heat exchange pipe section connects, and the other end can be connected with indoor set heat exchanger through main capillary, electronic expansion valve set to as heat transfer medium by indoor set heat exchanger to open when outdoor unit heat exchanger flows and set for the aperture, temperature detecting element set up in supercooling pipe section is last, temperature detecting element can be connected with the controller, so that the controller is based on temperature detecting element gathers supercooling pipe section's temperature adjustment electronic expansion valve's aperture.
The utility model also provides an outdoor unit, this outdoor unit include as above-mentioned preferred technical scheme in any one outdoor unit heat exchanger.
The utility model also provides a variable frequency air conditioner, this variable frequency air conditioner include indoor set and the above-mentioned preferred technical scheme in the off-premises station.
The technical scheme that can understand in this field in the utility model is preferred, the off-premises station heat exchanger includes heat exchange tube section, crosses cold tube section and governing valve, and the governing valve is passed through with heat exchange tube section to the one end of crossing cold tube section and is connected, and the other end can be connected with the indoor set heat exchanger through main capillary, and the governing valve sets to open when heat transfer medium flows to the off-premises station heat exchanger by the indoor set heat exchanger and sets for the aperture.
The regulating valve is arranged between the heat exchange pipe section and the supercooling pipe section of the outdoor unit heat exchanger, so that the regulating valve is fully opened to avoid the influence on the refrigeration energy efficiency when the air conditioner refrigerates; during heating, the opening degree of the regulating valve is changed, so that the supercooling degree can be accurately controlled, the supercooling pipe section of the outdoor unit heat exchanger serves as extension and supplement of the indoor unit heat exchanger, the heat exchange area of the indoor unit heat exchanger is increased in a phase-changing manner, the supercooling section of the high-pressure side is lengthened, the temperature of a heat exchange medium can be further reduced, the saturation pressure of the high-pressure side is reduced, the power of a compressor is reduced, and the heating energy consumption is greatly reduced. Through repeated tests, observation, analysis and comparison of the inventor, under the condition of adopting the setting mode, the heating energy efficiency of the air conditioner applying the heat exchanger can be accurately controlled and basically reaches the refrigeration energy efficiency level.
Furthermore, the temperature detection element is arranged on the supercooling pipe section, so that the opening degree of the regulating valve can be regulated based on the temperature of the supercooling pipe section, the regulating valve is accurately controlled, the power of the compressor is further reduced, and the heating energy efficiency is improved.
Furthermore, the supercooling pipe section is arranged on the windward side, so that the heat exchange capacity of the heat exchange pipe section on the leeward side can be increased, and the power of the compressor is further reduced. The reason is that the temperature of the heat exchange medium in the supercooling section pipe after primary throttling is still higher than the ambient temperature, and before secondary throttling, the supercooling section exchanges heat with the air flow, so that the heat released by the supercooling section pipe is blown to the heat exchange pipe section on the leeward side along with the air flow to exchange heat, and at the moment, the heat exchange medium in the heat exchange pipe section on the leeward side is throttled for the second time to reach a low-temperature and low-pressure state.
The outdoor unit heat exchanger, the outdoor unit and the variable frequency air conditioner of the present invention will be described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of an outdoor unit heat exchanger according to the present invention;
FIG. 2 is a system diagram of the inverter air conditioner of the present invention;
fig. 3 is a flow chart of a heating control method of the air conditioner of the present invention;
fig. 4 is a logic diagram of a heating control method of the air conditioner of the present invention.
List of reference numerals
1. A variable frequency compressor; 2. a four-way valve; 3. an indoor unit heat exchanger; 4. an indoor fan; 5. an outdoor heat exchanger; 51. a heat exchange tube section; 52. an overcooling pipe section; 53. adjusting a valve; 54. a temperature detection element; 6. an outdoor fan; 7. a primary capillary.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the outdoor heat exchanger in the drawings is described in conjunction with a double-row heat exchanger, the specific form of the outdoor heat exchanger is not constant, and those skilled in the art can make modifications as needed to suit the specific application. For example, the utility model discloses can also be applied to three rows of heat exchangers or single heat exchanger etc..
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
First, referring to fig. 1 and 2, the outdoor heat exchanger of the present invention will be described. Fig. 1 is a schematic structural view of an outdoor unit heat exchanger according to the present invention; fig. 2 is a schematic system diagram of the inverter air conditioner of the present invention.
As shown in fig. 1 and 2, in order to solve the problem of low heating efficiency of the conventional inverter air conditioner, the present application provides an outdoor unit heat exchanger 5, which includes a heat exchange pipe section 51, a supercooling pipe section 52 and a regulating valve 53, wherein the heat exchange pipe section 51 and the supercooling pipe section 52 are both formed by connecting U-shaped pipes, one end (upper end in fig. 1) of the supercooling pipe section 52 is connected with the heat exchange pipe section 51 through the regulating valve 53, and the other end (lower end in fig. 1) is connected with an indoor unit heat exchanger 3 through a main capillary tube 7. The regulating valve 53 is set to be fully opened when a heat exchange medium (such as a refrigerant) flows from the outdoor heat exchanger 5 to the indoor heat exchanger 3, and to be opened by a set opening degree when the heat exchange medium flows from the indoor heat exchanger 3 to the outdoor heat exchanger 5.
It should be noted that, in the present application, the set opening degree refers to any opening degree between the fully closed state and the fully open state, and the magnitude of the specific opening degree can be controlled based on parameters, such as the outdoor ambient temperature, the temperature of the sub-cooling pipe section 52, and the like.
Referring to fig. 2, taking the heat exchange medium as an example, when the outdoor heat exchanger 5 is applied to a variable frequency air conditioner, in a refrigeration mode, the regulating valve 53 is fully opened, the refrigerant enters the outdoor heat exchanger 5 after being discharged from an exhaust port of the variable frequency compressor 1 and sequentially flows through the heat exchange tube section 51, the regulating valve 53 and the supercooling tube section 52 to perform condensation heat exchange with outdoor air, the refrigerant after heat exchange enters the indoor heat exchanger 3 after being throttled by the main capillary tube 7 to perform evaporation heat exchange with indoor air, and the refrigerant after heat exchange returns to the variable frequency compressor 1 from an air suction port of the variable frequency compressor 1 to complete a refrigeration cycle. In the heating mode, the regulating valve 53 is opened to set the opening, the refrigerant is discharged through the exhaust port of the variable frequency compressor 1 and then enters the indoor unit heat exchanger 3 to perform condensation heat exchange with indoor air, the refrigerant after heat exchange enters the supercooling pipe section 52 after being throttled and cooled for the first time by the main capillary tube 7, the temperature of the refrigerant entering the supercooling pipe section 52 is still high, the refrigerant enters the heat exchange pipe section 51 to perform evaporation heat exchange with outdoor air under the secondary throttling of the regulating valve 53 after being further condensed and heat exchanged with outdoor air, and the refrigerant after heat exchange returns to the variable frequency compressor 1 from the air suction port of the variable frequency compressor 1 to complete a heating cycle.
As can be seen from the above description, by providing the regulating valve 53 between the heat exchange tube section 51 and the supercooling tube section 52 of the outdoor heat exchanger 5, the air conditioner can avoid the influence on the refrigeration energy efficiency by fully opening the regulating valve 53 when refrigerating; during heating, the opening change of the regulating valve 53 is controlled, so that the supercooling degree can be accurately controlled, the supercooling section 52 of the outdoor heat exchanger 5 serves as extension and supplement of the indoor heat exchanger 3, the heat exchange area of the indoor heat exchanger 3 is increased in a phase-changing manner, the supercooling section on the high-pressure side is lengthened, the temperature of a heat exchange medium can be further reduced, the saturation pressure on the high-pressure side is reduced, the power of a compressor is reduced, and the heating energy consumption is greatly reduced. Through repeated tests, observation, analysis and comparison of the inventor, under the condition of adopting the setting mode, the heating energy efficiency of the air conditioner applying the heat exchanger can be accurately controlled and basically reaches the refrigeration energy efficiency level.
The outdoor heat exchanger 5 of the present application will be described in detail with further reference to fig. 1 and 2.
As shown in fig. 1, in a preferred embodiment, the outdoor heat exchanger 5 further includes a temperature detecting element 54 disposed on the supercooling pipe section 52 and capable of being connected to a controller of the inverter air conditioner, so that the controller can control the opening degree of the regulating valve 53 based on the temperature of the supercooling pipe section 52 collected by the temperature detecting element 54 during heating operation. The temperature detecting element 54 may be a temperature sensor, a thermal bulb, etc., which is attached to the outer surface of the U-shaped tube of the supercooling tube section 52 and connected to the controller through a lead. The controller may be a controller of an air conditioner, a PID regulator, or the like.
By arranging the temperature detection element 54 on the supercooling pipe section 52, the opening degree of the regulating valve 53 can be regulated based on the temperature of the supercooling pipe section 52, so that the regulating valve 53 can be accurately controlled, the power of the compressor is further reduced, and the heating energy efficiency is improved.
As shown in fig. 1, in a preferred embodiment, the outdoor heat exchanger 5 is a double-row heat exchanger, and the supercooling pipe section 52 is disposed below the heat exchange pipe section 51 and on the windward side (i.e., the right side in fig. 1) of the outdoor heat exchanger 5.
By arranging the supercooling pipe section 52 below the heat exchange pipe section 51 and on the windward side, the heat exchange capacity of the leeward side heat exchange pipe section 51 can be increased, and the power of the inverter compressor 1 can be further reduced. This is because, the temperature of the heat exchange medium in the subcooling section tube after primary throttling is still higher than the ambient temperature, and before secondary throttling, the subcooling section tube 52 exchanges heat with the air flow, so that the heat released by the subcooling section tube 52 is blown to the heat exchange tube section 51 on the leeward side along with the air flow to exchange heat, and at this time, the heat exchange medium in the heat exchange tube section 51 on the leeward side is throttled for the second time to reach a low-temperature and low-pressure state, so that the high-pressure side pressure can be reduced to reduce the power of the inverter compressor 1, the heat exchange effect of the heat exchange tube section 51 can be ensured, and the overall energy efficiency can be greatly improved.
In a preferred embodiment, the heat exchange tube section 51 is divided into a plurality of flow paths, and the cross section of the flow paths is N-type and/or N-type. Specifically, the heat exchange tube section 51 in this embodiment has two flow paths, one of which is N-shaped and the other is N-shaped in cross section, and the flow directions of the two flow paths are from the windward side to the leeward side. Therefore, the heat exchange pipe section 51 is divided into a plurality of flow paths, and multiple paths of refrigerants exchange heat simultaneously in the heat exchange process, so that the heat exchange efficiency and the heat exchange effect are ensured. The flow direction of the two flow paths is set to flow from the windward side to the leeward side, so that the temperature of air flow subjected to heat exchange with the refrigerant on the windward side is increased in the flowing process of the refrigerant, and then the air flow is subjected to heat exchange with the refrigerant on the leeward side, and the heat exchange effect of the heat exchange tube section 51 is improved.
Of course, it will be understood by those skilled in the art that the above arrangement is not a constant one and that those skilled in the art may make adjustments without departing from the principles of the present application, provided that the adjustments are such as to divide the heat exchange section 51 into a plurality of flow paths, each flow path being N-shaped and/or N-shaped in cross-section. For example, the flow path may be divided into three or more, and each flow path may have an N-type or N-type cross section.
In a more preferred embodiment, the regulating valve 53 is an electronic expansion valve in the present embodiment, and the electronic expansion valve is set to be fully opened when the inverter air conditioner operates in the cooling mode and to be opened by a set opening degree when the inverter air conditioner operates in the heating mode. Due to the arrangement of the electronic expansion valve, the supercooling degree of the system can be accurately adjusted by adjusting the opening degree of the electronic expansion valve in the heating process of the variable frequency air conditioner, so that the heating power is reduced, and the heating energy efficiency is improved.
Although the regulating valve 53 is an electronic expansion valve in the present embodiment, this is not limitative, and those skilled in the art can modify the regulating valve based on the specific application scenario, for example, the regulating valve 53 can also be an electronic control valve such as a solenoid valve.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
The application also provides an outdoor unit, which comprises the outdoor unit heat exchanger 5 in each embodiment.
The application also provides a variable frequency air conditioner, which comprises an indoor unit, an outdoor unit and a pipeline for connecting the indoor unit and the outdoor unit. The outdoor unit comprises a variable frequency compressor 1, a four-way valve 2, an outdoor unit heat exchanger 5, an outdoor fan 6 and a main capillary tube 7, and the indoor unit comprises an indoor unit heat exchanger 3 and an indoor fan 4. The outdoor heat exchanger is the outdoor heat exchanger 5 in the above preferred technical solution.
The adjusting valve 53 is arranged between the heat exchange pipe section 51 and the supercooling pipe section 52 of the outdoor unit heat exchanger 5 of the variable frequency air conditioner, so that the adjusting valve 53 is fully opened to avoid the influence on the refrigeration energy efficiency when the air conditioner refrigerates; during heating, the opening degree of the regulating valve 53 is changed, so that the supercooling degree can be accurately controlled, the supercooling section 52 of the outdoor heat exchanger 5 serves as extension and supplement of the indoor heat exchanger 3, the heat exchange area of the indoor heat exchanger 3 is increased in a phase-changing manner, the supercooling section on the high-pressure side is lengthened, the temperature of a heat exchange medium can be further reduced, the saturation pressure on the high-pressure side is reduced, the power of a compressor is reduced, and the heating energy consumption is greatly reduced.
The working process of the inverter air conditioner of the present invention will be briefly described with reference to fig. 2.
As shown in fig. 2, when the inverter air conditioner operates in the cooling mode, the electronic expansion valve is fully opened, the refrigerant is discharged from the exhaust port of the inverter compressor 1, enters the outdoor-unit heat exchanger 5, flows through the N-type flow path and the N-type flow path of the heat exchange pipe section 51 simultaneously, condenses and exchanges heat with outdoor air, and then joins into one flow path, the refrigerant continues to condense and exchanges heat with outdoor air through the electronic expansion valve (regulating valve 53) and the supercooling pipe section 52, the heat-exchanged refrigerant enters the indoor-unit heat exchanger 3 after being throttled by the main capillary tube 7, evaporates and exchanges heat with indoor air, and the heat-exchanged refrigerant returns to the inverter compressor 1 from the suction port of the inverter compressor 1, thereby completing a cooling cycle.
When the variable frequency air conditioner operates in a heating mode, the electronic expansion valve is opened by a set opening degree, a refrigerant is discharged from an exhaust port of the variable frequency compressor 1 and then enters the indoor heat exchanger 3 to perform condensation heat exchange with indoor air, the refrigerant after heat exchange is subjected to primary throttling and cooling through the main capillary tube 7 and then enters the supercooling pipe section 52 of the outdoor heat exchanger 5, the temperature of the refrigerant entering the supercooling pipe section 52 is still high, the refrigerant passing through the supercooling pipe section 52 and the outdoor air performs further condensation heat exchange, the refrigerant enters the heat exchange pipe section 51 under secondary throttling of the electronic expansion valve (regulating valve 53), the refrigerant entering the heat exchange pipe section 51 is divided into two paths to enter the N-type flow path and simultaneously performs evaporation heat exchange with the outdoor air, the temperature of air after heat exchange with the supercooling pipe section 52 and the heat exchange pipe section 51 on the windward side is increased in the heat exchange process, and then performs heat exchange with, the heat exchange effect is improved. The heat-exchanged refrigerants are converged into a flow path and then return to the inverter compressor 1 from the air suction port of the inverter compressor 1, and a heating cycle is completed.
It will be appreciated by those of skill in the art that although some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
Example 2
The heating control method of the air conditioner of the present application will be described with reference to fig. 3. Wherein, fig. 3 is a flow chart of the heating control method of the air conditioner of the present invention.
As shown in fig. 3, the present application also provides a heating control method for an inverter air conditioner corresponding to the inverter air conditioner, and the specific structure of the inverter air conditioner is described in embodiment 1 and is not described herein again. The heating control method comprises the following steps:
s100, under the heating mode, acquiring the outdoor environment temperature and the working frequency of a compressor; for example, the outdoor ambient temperature is obtained by a temperature sensor provided in the outdoor unit, and the operating frequency of the compressor is obtained based on the operating parameters when an inverter air conditioner (hereinafter, referred to as an air conditioner) is operated.
S200, calculating the theoretical temperature of the supercooling pipe section 52 based on the outdoor environment temperature; for example, the theoretical temperature of the subcooled tube segment 52 in the current environment is calculated based on a fit formula between the ambient temperature and the theoretical temperature. In this application, the theoretical temperature refers to the temperature of the supercooling pipe section 52 when the heating power or the heating energy efficiency is in a better state, and the temperature can be obtained through experiments.
S300, calculating the operation opening of the electronic expansion valve based on the outdoor environment temperature, the working frequency and the theoretical temperature; for example, the operation opening degree of the electronic expansion valve in the current environment is calculated based on a fitting formula between three parameters of the outdoor environment temperature, the operating frequency and the theoretical temperature and the operation opening degree of the electronic expansion valve.
S400, adjusting the opening degree of the electronic expansion valve to an operation opening degree; for example, after the operating opening degree of the electronic expansion valve is calculated, the controller of the air conditioner controls the opening degree of the electronic expansion valve to be adjusted to the operating opening degree. The controller may be a control chip disposed in the air conditioner physically, or may be a controller specially used for executing the method of the present invention, or may be a functional module or a functional unit of a general controller.
As can be seen from the above description, by calculating the theoretical temperature of the supercooling pipe section 52 based on the outdoor environment temperature, and then controlling the opening of the electronic expansion valve based on the outdoor environment temperature, the operating frequency of the compressor, and the theoretical temperature of the supercooling pipe section 52, when the air conditioner is heating, the supercooling pipe section 52 of the heat exchanger of the outdoor unit can be used as an extension and a supplement of the heat exchanger of the indoor unit by changing the opening of the first regulating valve 53, the heat exchange area of the heat exchanger of the indoor unit is increased in a phase-changing manner, and then the electronic expansion valve is controlled to be opened to the opening capable of enabling the supercooling pipe section 52 to reach a better temperature (i.e., the theoretical temperature) based on the outdoor environment condition, so that the supercooling degree of the air conditioning system is accurately controlled, the heating effect of the. Through repeated experiments, observation, analysis and comparison of the inventor, under the condition of adopting the setting and control mode, the heating energy efficiency of the air conditioner can be accurately controlled and basically reaches the refrigeration energy efficiency level.
In a preferred embodiment, the theoretical temperature of the subcooled tube section 52 can be calculated using the following equation (1):
Tc＝k×Tao+t (1)
in the formula (1), TcIs the theoretical temperature of the subcooling tube section 52; t isaoIs the outdoor ambient temperature; k. t is a constant that can be fit based on experimental data, e.g., multiple experiments on the air conditioner for different outdoor ambient temperatures. In the experiment, based on different outdoor environment temperatures, the temperature of the supercooling pipe section 52 is adjusted, so that the heat exchange effect under the condition is optimal, and the temperature of the supercooling pipe section 52 with the optimal heat exchange effect is recorded as the theoretical temperature under the condition. After multiple tests, the values of the constants k and t are calculated by using a linear fitting method, so that a fitting formula between the outdoor environment temperature and the theoretical temperature of the supercooling pipe section 52 is obtained.
It can be understood by those skilled in the art that the theoretical temperature of the subcooling pipe section 52 determines the heat exchange effect of the subcooling pipe section 52 and indirectly determines the heating energy efficiency, the heat exchange effect of the subcooling pipe section 52 has a direct relationship with the outdoor environment temperature, when the temperature difference between the outdoor environment temperature and the subcooling pipe section 52 reaches a certain range, the subcooling degree of the air conditioning system also reaches a better state, and the theoretical temperature of the subcooling pipe section 52 is calculated based on the outdoor environment temperature, the control method of the present application can correlate the theoretical temperature of the subcooling pipe section 52 with the outdoor environment temperature, and on the basis of ensuring the optimal subcooling degree and subcooling effect of the outdoor heat exchanger, the power of the compressor is reduced, and the heating efficacy is improved.
Of course, the determination of the theoretical temperature is not limited to the method shown in equation (1), and equation (1) may be replaced by any method for determining the theoretical temperature of the subcooling section 52 from the outdoor ambient temperature without departing from the principles of the present application. The specific value of the theoretical temperature may also be determined by the correspondence between the outdoor ambient temperature and the theoretical temperature of the supercooled section 52, for example.
In a more preferred embodiment, the following fitting formula (2) can be used to calculate the operation opening degree of the electronic expansion valve:
B＝a×f+b×Tao+c×Int(Tc-Tao) (2)
in the formula (2), B is the operation opening degree of the electronic expansion valve; f is the working frequency of the compressor; t iscIs the theoretical temperature of the subcooling tube section 52; t isaoIs the outdoor ambient temperature; int (T)c-Tao) The rounding operation is carried out on the difference value between the theoretical temperature of the supercooling pipe section 52 and the outdoor environment temperature; a. b and c are constants which can be obtained by fitting based on experimental data. For example, the heating energy efficiency of the air conditioner is tested several times for different outdoor ambient temperatures, compressor frequencies, and theoretical temperatures of the supercooling duct section 52. In the experiment, the opening of the electronic expansion valve is adjusted to minimize the heating energy efficiency of the air conditioner, and the opening parameter of the electronic expansion valve corresponding to the current heating energy efficiency is recorded as the operation opening of the electronic expansion valve under the condition. After a number of tests, the values of constants a, b, and c are calculated to obtain a fit formula between the electronic expansion valve and the outdoor ambient temperature, the compressor frequency, and the theoretical temperature of the subcooling section 52.
By jointly determining the operation opening degree of the electronic expansion valve based on the working frequency of the compressor, the theoretical temperature of the supercooling pipe section 52 and the outdoor environment temperature, the control method can jointly determine the operation opening degree of the electronic expansion valve based on various variable quantities, improves the calculation accuracy of the operation opening degree, enables the electronic expansion valve to constantly work at a proper opening degree, and reduces the heating energy consumption of the air conditioner.
Of course, the operating opening degree of the electronic expansion valve may also be determined based on other relationships with the above-mentioned parameters, such as fixed correspondence between the above-mentioned three parameters and the operating opening degree.
In a more preferred embodiment, after step S300, the heating control method further includes: acquiring the actual temperature of the supercooling pipe section 52; and carrying out PID (proportion integration differentiation) adjustment on the opening degree of the electronic expansion valve based on the difference value between the theoretical temperature and the actual temperature.
By performing PID control on the opening degree of the electronic expansion valve based on the difference between the theoretical temperature and the actual temperature of the supercooling pipe section 52 after adjusting the opening degree of the electronic expansion valve to the operation opening degree, the control method can also dynamically, quickly and accurately adjust the opening degree of the electronic expansion valve, and prevent the electronic expansion valve from overshooting or overshooting.
The control process of the heating control method of the air conditioner of the present application will be briefly described with reference to fig. 4. Wherein, fig. 4 is a logic diagram of the heating control method of the air conditioner of the present invention.
In one possible implementation, as shown in fig. 4, the air conditioner is in heating operation → operation, and obtains the outdoor ambient temperature TaoAnd the operating frequency f → of the compressor → the theoretical temperature T of the supercooling pipe section 52 is calculated based on the formula (1)cCalculating an operation opening B of the electronic expansion valve based on the formula (2) → controlling the electronic expansion valve to open to the opening B, so that the air conditioner operates with better heating energy efficiency → the air conditioner operates for 2min, and then detecting the actual temperature T of the supercooling pipec1→ calculation of the theoretical temperature TcAnd the actual temperature Tc1The difference value △ T is obtained, PID accurate adjustment is carried out on the opening degree of the electronic expansion valve based on the difference value △ T, the heating energy efficiency of the air conditioner is guaranteed, and overshoot or overshoot of the electronic expansion valve is prevented.
Corresponding to the heating control method, the application also provides a heating control system of the air conditioner, and the heating control system mainly comprises a detection unit, a calculation unit control unit and a PID (proportion integration differentiation) regulation unit. The detection unit is used for acquiring the outdoor environment temperature and the working frequency of the compressor; the calculation unit is at least connected with the detection unit and is used for calculating the theoretical temperature of the supercooling pipe section 52 based on the outdoor environment temperature and calculating the operation opening of the regulating valve 53 based on the outdoor environment temperature, the working frequency and the theoretical temperature; the control unit is at least connected with the calculation unit and is used for adjusting the opening degree of the regulating valve 53 to the operation opening degree;
the detection unit is further configured to obtain an actual temperature of the supercooling pipe section 52, and the heating control system further includes a PID adjustment unit, which is connected to at least the calculation unit and is configured to perform PID adjustment on the opening degree of the adjustment valve 53 based on a difference between the theoretical temperature and the actual temperature.
The detection unit may further include an ambient temperature detection subunit, a working frequency detection subunit, and a supercooling pipe section 52 temperature detection subunit, wherein the ambient temperature detection subunit may be a temperature sensor or a temperature sensing bulb, and is disposed on the casing of the outdoor unit; the sub-unit for detecting the temperature of the supercooling pipe section 52 may be a temperature sensor or a temperature sensing bulb, which is attached to the outer surface of the U-shaped pipe of the supercooling pipe section 52, and the sub-unit for detecting the frequency may be a frequency detection circuit or a frequency detection component. Wherein, the control unit can be the control chip who sets up in the air conditioner physically, also can be the controller that is used for carrying out the utility model discloses a method, also can be a functional module or the functional unit of general controller.
Wherein the calculation unit calculates the theoretical temperature of the subcooling tube section 52 based on the outdoor ambient temperature by the following formula:
Tc＝k×Tao+t
in the above formula, TcIs the theoretical temperature of the subcooling tube section 52; t isaoIs the outdoor ambient temperature; k. t is a constant which can be obtained based on experimental data fitting, and the obtaining method is similar to the above and is not described herein again.
Wherein the calculation unit calculates the operation opening of the regulating valve 53 based on the outdoor ambient temperature, the operating frequency and the theoretical temperature by the following formula:
B＝a×f+b×Tao+c×Int(Tc-Tao)
in the formula, B is the operation opening degree of the electronic expansion valve; f is the working frequency of the compressor; t iscIs the theoretical temperature of the subcooling tube section 52; t isaoIs the outdoor ambient temperature; int (T)c-Tao) Is the theoretical temperature of the subcooling tube section 52 and the outdoor ambient temperatureCarrying out rounding operation on the difference value; a. b and c are constants which can be obtained based on experimental data fitting, and the obtaining method is not described herein again.
It should be noted that the heating control system provided in the above embodiment is exemplified by only dividing the above functional units (such as the detection unit, the calculation unit, the control unit, the PID adjustment unit, etc.), and in practical applications, the above functional units may be completed by different functional units according to needs, that is, the functional units in the embodiment of the present invention are further decomposed or combined, for example, the detection unit of the above embodiment may be split into a sub-unit for detecting the outdoor environment temperature, a sub-unit for obtaining the operating frequency of the compressor, and a sub-unit for detecting the actual temperature of the super-cooled pipe section 52; for another example, the calculation unit may be divided into a first calculation unit for calculating the theoretical temperature of the supercooled tube and a second calculation unit for calculating the operation opening degree of the regulation valve 53. The names of the functional units related to the embodiments of the present invention are only for distinguishing and are not to be construed as unduly limiting the present invention.
It will be understood by those skilled in the art that the heating control system of the air conditioner described above further includes some other known structures, such as a processor, a controller, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that microprocessors or Digital Signal Processors (DSPs) may be used in practice to implement some or all of the functionality of some or all of the components in servers, clients, or the like according to embodiments of the present invention. The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for performing a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, the skilled person can combine, disassemble and change the sequence of the above steps without departing from the basic principle of the present invention, and the technical solution modified in this way does not change the basic concept of the present invention, and therefore falls into the protection scope of the present invention.
Finally, it should be noted that although the present embodiment is described in conjunction with an inverter air conditioner, this is not intended to limit the scope of the present application, and those skilled in the art can also apply the present application to other types of air conditioners as long as the air conditioner has an outdoor unit condenser. For example, the present application can also be applied to a fixed-frequency air conditioner and the like.
So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims (10)
1. The outdoor unit heat exchanger is characterized by comprising a heat exchange pipe section, an supercooling pipe section and a regulating valve, wherein one end of the supercooling pipe section is connected with the heat exchange pipe section through the regulating valve, the other end of the supercooling pipe section is connected with the indoor unit heat exchanger through a main capillary tube, and the regulating valve is set to be opened to set the opening degree when a heat exchange medium flows from the indoor unit heat exchanger to the outdoor unit heat exchanger.
2. The outdoor unit heat exchanger of claim 1, further comprising a temperature sensing element disposed on the supercooling pipe section, wherein the temperature sensing element is capable of being connected to a controller, so that the controller adjusts the opening degree of the regulating valve based on the temperature of the supercooling pipe section collected by the temperature sensing element.
3. The outdoor unit heat exchanger of claim 1, wherein the supercooling pipe section is disposed at a windward side of the outdoor unit heat exchanger.
4. The outdoor unit heat exchanger of claim 1, wherein the supercooling pipe section is disposed below the heat exchange pipe section.
5. The outdoor unit heat exchanger of claim 1, wherein the heat exchange tube section includes a plurality of flow paths, and a cross section of the flow paths includes N-type and/or N-type.
6. The outdoor unit heat exchanger of claim 1, wherein the regulating valve is an electronic expansion valve or a solenoid valve.
7. The outdoor unit heat exchanger of claim 1, wherein the heat exchange tube sections are double rows.
8. An outdoor unit heat exchanger is characterized by comprising a heat exchange pipe section, an supercooling pipe section, an electronic expansion valve and a temperature detection element, wherein the supercooling pipe section is arranged below the heat exchange pipe section and located on the windward side of the outdoor unit heat exchanger, one end of the supercooling pipe section is connected with the heat exchange pipe section through the electronic expansion valve, the other end of the supercooling pipe section is connected with the indoor unit heat exchanger through a main capillary tube, the electronic expansion valve is set to be opened for setting the opening degree when a heat exchange medium flows from the indoor unit heat exchanger to the outdoor unit heat exchanger, the temperature detection element is arranged on the supercooling pipe section, and the temperature detection element can be connected with a controller so that the controller can adjust the opening degree of the electronic expansion valve based on the temperature of the supercooling pipe section collected by the temperature detection element.
9. An outdoor unit comprising the outdoor heat exchanger according to any one of claims 1 to 8.
10. An inverter air conditioner, characterized in that the inverter air conditioner comprises an indoor unit and the outdoor unit of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921572167.XU CN210891940U (en) | 2019-09-20 | 2019-09-20 | Outdoor unit heat exchanger, outdoor unit and variable frequency air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921572167.XU CN210891940U (en) | 2019-09-20 | 2019-09-20 | Outdoor unit heat exchanger, outdoor unit and variable frequency air conditioner |
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| Publication Number | Publication Date |
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| CN210891940U true CN210891940U (en) | 2020-06-30 |
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|---|---|---|---|
| CN201921572167.XU Active CN210891940U (en) | 2019-09-20 | 2019-09-20 | Outdoor unit heat exchanger, outdoor unit and variable frequency air conditioner |
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| Country | Link |
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| CN (1) | CN210891940U (en) |
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