CN102478296B - Control device of multi-connected central air conditioning system and control method thereof - Google Patents
Control device of multi-connected central air conditioning system and control method thereof Download PDFInfo
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- CN102478296B CN102478296B CN201010576222.XA CN201010576222A CN102478296B CN 102478296 B CN102478296 B CN 102478296B CN 201010576222 A CN201010576222 A CN 201010576222A CN 102478296 B CN102478296 B CN 102478296B
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Abstract
The invention discloses a control device of a multi-connected central air conditioning system. The control device is provided with an outdoor unit and multiple indoor units, wherein an air pipe and a liquid pipe of the outdoor unit are connected with an air pipe branch and a liquid pipe branch of each indoor unit; an electronic expansion valve is arranged in the liquid pipe branch of each indoor unit; the control device is characterized by comprising a liquid pipe temperature sensor, a superheat degree detection module and a refrigeration opening regulation module, wherein the liquid pipe temperature sensor is used for detecting the liquid pipe temperature of each indoor unit; the superheat degree detection module is used for detecting the superheat degree; the refrigeration opening regulation module is used for regulating the opening of the electronic expansion valve in refrigeration, and comprises a first sub-module, a second sub-module and a third sub-module, wherein the first sub-module regulates the opening of the electronic expansion valve according to the first target temperature when the liquid pipe temperature is higher than or equal to the first target temperature; the second sub-module regulates the opening of the electronic expansion valve according to the second target temperature when the liquid pipe temperature is lower than or equal to the second target temperature; and the third sub-module regulates the opening of the electronic expansion valve according to the detected superheat degree when the liquid pipe temperature is higher than the second target temperature and lower than the first target temperature.
Description
Technical field
The control device and the control method thereof that the present invention relates to a kind of multi-connected central air conditioner, relate in particular to the control of its indoor set.
Background technology
Multiple central air conditioner system is the air-conditioning system being connected to form by an off-premises station and Duo Tai indoor set, is mainly installed on larger indoor, space.In this multiple central air conditioner system, because refrigeration or the heating capacity of indoor set can independently be adjusted, can to being installed, each room of indoor set carry out independently temperature control as required.The refrigeration of indoor set or the control of heating capacity are to realize by changing the aperture of electric expansion valve.
In the prior art, during refrigeration, according to the degree of superheat, carry out the aperture of organic electronic expansion valve in conditioning chamber, and while heating, according to the temperature of tracheae, regulate the aperture of electric expansion valve.
Due to the distance between each indoor set and off-premises station different, the internal resistance of pipeline is not identical yet.Particularly for the indoor set that is positioned at refrigerating circulation end, tend to because of pipeline internal resistance excessively, cause cold medium flux to reduce, occur that the temperature of tracheae and liquid pipe is higher, and the lower phenomenon of the degree of superheat.Now, if only carry out the aperture of organic electronic expansion valve in conditioning chamber according to the degree of superheat, the electric expansion valve of indoor set can not opened, and causes the refrigeration variation of indoor set.
And while heating, for the indoor set that heats circulation line end, uneven due to increase or the shunting of pipeline internal resistance equally, cause the temperature of tracheae higher.Now, only according to the temperature of tracheae, regulate the aperture of electric expansion valve, the aperture of electric expansion valve will be very large, and heating effect is just poor.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of indoor set control system and control method thereof of multi-connected central air conditioner, even to realize because of reasons such as pipeline internal resistances, cold medium flux diminishes or when inhomogeneous, still can make indoor set have good refrigeration or heating effect.
Technical scheme 1: a kind of control device of multi-connected central air conditioning system, there is single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, the liquid pipe temperature sensor that comprises the liquid pipe temperature (TC2) that detects indoor set, detect the degree of superheat detection module of the degree of superheat (SH), when refrigeration, the refrigeration regulation module that the aperture of described electric expansion valve is regulated, described refrigeration regulation module, when being included in liquid pipe temperature (TC2) and being more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the 1st submodule of electronic expansion valve opening, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the 2nd submodule of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), and while being less than the 1st target temperature (TCm1), according to the detected degree of superheat (SH), regulate the 3rd submodule of electronic expansion valve opening.
As from the foregoing, owing on each liquid pipe branch pipe, liquid pipe temperature sensor being set, can accurately measure the temperature of liquid pipe, with exactly by liquid pipe temperature (TC2) and the 1st target temperature (TCm1) and the comparison of the 2nd target temperature (TCm2), thereby accurately control and regulate the aperture of electric expansion valve.And when refrigeration, if liquid pipe temperature is less than the 1st target temperature (TCm1), while being greater than the 2nd target temperature (TCm2), according to the detected degree of superheat (SH), regulate electronic expansion valve opening, if liquid pipe temperature (TC2) is during higher than the 1st target temperature (TCm1) or lower than the 2nd target temperature (TCm2), according to the 1st target temperature (TCm1) or the 2nd target temperature (TCm2), regulate respectively the aperture of electric expansion valve, therefore, even for because of pipeline internal resistance larger, the indoor set that cold medium flux is less, can be not higher because of the temperature of tracheae and liquid pipe, and occur that the situation that electric expansion valve is not opened occurs, guaranteed the refrigeration of indoor set.Like this, the cold medium flux in each indoor set is well regulated, and also makes the cold medium flux equilibrium in each interior machine in multi-connected central air conditioner.
Technical scheme 2: according to the control device of a kind of multi-connected central air conditioning system described in technical scheme 1, the tracheae temperature sensor also with the tracheae temperature (TC1) that detects indoor set, described degree of superheat detection module, according to the liquid pipe temperature (TC2) detecting and tracheae temperature (TC1) by calculating the degree of superheat (SH).
From technical scheme 2, the tracheae temperature sensor of indoor set can accurately measure the temperature of tracheae, then degree of superheat detection module according to the liquid pipe temperature that detects and tracheae temperature computation out, the value of the degree of superheat calculating.
Technical scheme 3: according to the control device of a kind of multi-connected central air conditioning system described in technical scheme 1, also there is the external environment temperature sensor that detects external environment temperature (tao), described the 3rd submodule, according to external environment temperature (tao) the target setting degree of superheat (SHm) detecting, according to the degree of superheat detecting (SH) and the difference of the target degree of superheat (SHm), regulate electronic expansion valve opening.
From technical scheme 3, external environment temperature sensor can accurately measure external environment temperature (tao), as the 3rd submodule according to the basis of outer shroud temperature (tao) the target setting degree of superheat (SHm), thereby according to the difference of the degree of superheat detecting (SH) and the target degree of superheat (SHm), regulate electronic expansion valve opening.
Technical scheme 4: a kind of control device of multi-connected central air conditioning system, there is single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, comprise the liquid pipe temperature sensor that detects indoor set liquid pipe temperature (TC2), detect the tracheae temperature sensor of the tracheae temperature (TC1) of indoor set, when heating, what the aperture of described electric expansion valve was regulated heats regulation module, the described regulation module that heats, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the 1st submodule of electronic expansion valve opening, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the 2nd submodule of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), and while being less than the 1st target temperature (TCm1), according to detected tracheae temperature (TC1), regulate the 3rd submodule of electronic expansion valve opening.
As seen from the above, owing to being provided with tracheae temperature sensor and liquid pipe temperature sensor, while heating, if liquid pipe temperature (TC2) is greater than the 2nd target temperature (TCm2), and while being less than the 1st target temperature (TCm1), according to detected tracheae temperature (TC1), regulate electronic expansion valve opening, and liquid pipe temperature (TC2) is when being more than or equal to the 1st target temperature (TCm1) or being less than or equal to the 2nd target temperature (TCm2), according to the 1st target temperature (TCm1) or the 2nd target temperature (TCm2), regulate electronic expansion valve opening respectively.Therefore, even for because pipeline internal resistance is larger, cold medium flux is less or distribute irregular indoor set, can be because tracheae temperature is higher, and occur that the excessive situation of aperture of electric expansion valve occurs, guaranteed the heating effect of indoor set.
Technical scheme 5: according to the control device of a kind of multi-connected central air conditioning system described in technical scheme 4, the high pressure sensor also with the liquid pipe pressure (Pb) that detects described off-premises station, described the 3rd submodule, according to off-premises station liquid pipe pressure (Pb) the target setting tracheae temperature (TCm) detecting, according to the tracheae temperature (TC1) detecting and the difference of target tracheae temperature (TCm), regulate electronic expansion valve opening.
From technical scheme 5, at off-premises station, place arranges high pressure sensor, can accurately and timely measure the liquid pipe pressure (Pb) of off-premises station, basis as off-premises station target setting tracheae temperature (TCm), can according to the tracheae temperature (TC1) detecting and the difference of target tracheae temperature (TCm), regulate electronic expansion valve opening more accurately, control more flexible.
Technical scheme 6: a kind of control method of multi-connected central air conditioning system, described multi-connected central air conditioning system has single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, when refrigeration, comprise the step that detects indoor set liquid pipe temperature (TC2), detect the step of indoor set tracheae temperature (TC1), detect the step of the degree of superheat (SH), the step that the size of liquid pipe temperature (TC2) and target temperature (TCm1) is compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the step of electronic expansion valve opening, the step that the size of liquid pipe temperature (TC2) and the 2nd target temperature (TCm2) is compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the step of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), while being less than the 1st target temperature (TCm1), according to the degree of superheat (SH), regulate the step of electronic expansion valve opening.
Technical scheme 7: a kind of control method of multi-connected central air conditioning system, described multi-connected central air conditioning system has single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, when heating, comprise the step that detects indoor set liquid pipe temperature (TC2), detect the step of indoor set tracheae temperature (TC1), the step that the size of liquid pipe temperature (TC2) and target temperature (TCm1) is compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the step of electronic expansion valve opening, the step that the size of liquid pipe temperature (TC2) and the 2nd target temperature (TCm2) is compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the step of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), while being less than the 1st target temperature (TCm1), according to indoor set tracheae temperature (TC1), regulate the step of electronic expansion valve opening.
From technical scheme 6 and technical scheme 7, multi-connected central air conditioner is when freezing or heating, if liquid pipe temperature higher than the maximum temperature (the 1st target temperature) of setting or lower than set minimum temperature (the 2nd target temperature) time, according to maximum temperature (the 1st target temperature) or minimum temperature (the 2nd target temperature), regulate electric expansion valve.By above technical scheme, control multiple central air conditioner, can effectively solve in kind of refrigeration cycle or the indoor set that heats circulation line end reduces to cause the temperature of tracheae and liquid pipe higher because pipeline internal resistance causes cold medium flux, the situation that electric expansion valve is not opened occurs, guarantee refrigeration or the heating effect of each indoor set, and made the cold medium flux of each indoor set balanced.
Accompanying drawing explanation
Fig. 1 is multi-connected central air conditioning system connection diagram;
Fig. 2 is multi-connected central air conditioner process of refrigerastion schematic diagram;
Fig. 3 is that multi-connected central air conditioner regulates the concrete grammar schematic diagram of electric expansion valve in process of refrigerastion according to the target degree of superheat (SHm);
Fig. 4 is that multi-connected central air conditioner heats process schematic diagram;
Fig. 5 is that multi-connected central air conditioner regulates the concrete grammar schematic diagram of electric expansion valve in heating process according to target tracheae temperature (TCm).
reference numeral explanation
1-off-premises station; 2-pressure sensor; 3-exhaust outlet of compressor; 4-external environment temperature sensor; 5-tracheae; 51,52,53-tracheorrhaphy manifold; 6-liquid pipe; 61,62,63-liquid pipe branch pipe; 71,72,73-tracheae temperature sensor; 81,82,83-liquid pipe temperature sensor; 91,92,93-electric expansion valve; 101,102,103-indoor set.
The specific embodiment
Control device and the control method thereof of multi-connected central air conditioner of the present invention are described according to specific embodiment below.
Fig. 1 is multi-connected central air conditioning system connection diagram of the present invention, as can be seen from the figure the control device of multi-connected central air conditioning system of the present invention, there are single off-premises station 1 and 3 indoor sets (101,102,103), between indoor set 101, indoor set 102 and indoor set 103, be connected in parallel, between indoor set (101,102,103) in parallel and off-premises station 1, be connected in series.Exhaust outlet 3 at the compressor of off-premises station 1 is provided with pressure sensor 2.The setting of this pressure sensor can accurately measure the high-pressure Pb of off-premises station 1.
The tracheae 5 of off-premises station 1 be connected to indoor one with the common common pipe of tracheae of tracheae 5 on, liquid pipe 6 is connected on indoor one and the common common pipe of liquid pipe of liquid pipe 6, the tracheorrhaphy manifold (51,52,53) of indoor set (101,102,103) is connected to the common pipe of tracheae, and the liquid pipe branch pipe (61,62,63) of indoor set (101,102,103) is connected on the common pipe of liquid pipe.On the tracheorrhaphy manifold (51,52,53) of indoor set (101,102,103), be separately installed with tracheae temperature sensor (71,72,73), on the liquid pipe branch pipe (61,62,63) of indoor set (101,102,103), be separately installed with liquid pipe temperature sensor (81,82,83) and electric expansion valve (91,92,93) simultaneously
Tracheae temperature sensor (71,72,73) and the liquid pipe temperature sensor (81,82,83) of above-described each indoor set (101,102,103) can accurately detect tracheae temperature (TC1) and liquid pipe temperature (TC2).This multiple central air conditioner system also has control module (not shown in figure 1), this control module comprises the degree of superheat detection module that detects the degree of superheat (SH), described degree of superheat detection module is the computing module that calculates the value of the degree of superheat (SH) according to the liquid pipe temperature (TC2) that detects and tracheae temperature (TC1).
Control module in this multiple central air conditioner system also comprises refrigeration regulation module (not shown in figure 1), and this refrigeration regulation module, for when freezing, regulates the aperture of electric expansion valve (91,92,93).This refrigeration regulation module, comprises 3 submodules.The 1st submodule, for when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), regulates the module of electronic expansion valve opening according to the 1st target temperature (TCm1); The 2nd submodule, for when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), regulates the module of electric expansion valve (91,92,93) aperture according to the 2nd target temperature (TCm2); The 3rd submodule is for to be greater than the 2nd target temperature (TCm2) in liquid pipe temperature (TC2), and while being less than the 1st target temperature (TCm1), according to the detected degree of superheat (SH), regulate the module of electric expansion valve (91,92,93) aperture.
Described the 1st target temperature (TCm1) and the 2nd target temperature (TCm2) can be obtained by experiment.; by experiment; determine that the degree of superheat (SH) is less; when the aperture of electric expansion valve (91,92,93) is zero; the highest and minimum liquid pipe temperature (TC2), and using high and minimum determined liquid pipe temperature (TC2) as the 1st target temperature (TCm1) and the 2nd target temperature (TCm2) be stored in not shown control module.
Fig. 2 is multi-connected central air conditioner refrigeration control process schematic diagram, as shown in the figure, a kind of control method of multi-connected central air conditioning system, when refrigeration, first by liquid pipe temperature sensor (81,82,83), detected the liquid pipe temperature (TC2) of indoor set (101,102,103), in step S10, liquid pipe temperature (TC2) and the size of the 1st target temperature (TCm1) are compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), enter step S20, according to the 1st target temperature (TCm1), regulate electric expansion valve (91,92,93) aperture.Enter afterwards step S30, liquid pipe temperature (TC2) and the size of the 2nd target temperature (TCm2) are compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), enter step S40, according to the 2nd target temperature (TCm2), regulate electric expansion valve (91,92,93) aperture.If the comparative result of step S10 and S30 is, liquid pipe temperature (TC2) is greater than the 2nd target temperature (TCm2), or be less than the 1st target temperature (TCm1),, liquid pipe temperature (TC2) is between the 1st target temperature (TCm1) and the 2nd target temperature (TCm2) time, enter step S50, according to the degree of superheat (SH), regulate the aperture of electric expansion valve (91,92,93).
According to Fig. 3, illustrate that multi-connected central air conditioner regulates the idiographic flow of electric expansion valve (91,92,93) in process of refrigerastion according to the target degree of superheat (SHm) below.First at step S51, by external environment temperature sensor 4, detect external environment temperature (tao) numerical value, at step S 52, by described the 3rd submodule, according to external environment temperature (tao) the target setting degree of superheat (SHm) detecting, at step S53, the degree of superheat (SH) being calculated according to the tracheae temperature (TC1) detecting and liquid pipe temperature (TC2) by degree of superheat detection module, and according to the difference of this degree of superheat (SH) and the target degree of superheat (SHm), regulate the aperture of electric expansion valve (91,92,93), make the degree of superheat (SH) level off to the target degree of superheat (SHm).
Figure 4 shows that multi-connected central air conditioner heats flow process.The 1st target temperature (TCm1) while heating and the 2nd target temperature (TCm2) can be same with when refrigeration, pre-determine by experiment.
As shown in the figure, when heating, first detect the liquid pipe temperature (TC2) of indoor set (101,102,103), at step S1, liquid pipe temperature (TC2) and the size of the 1st target temperature (TCm1) are compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), enter step S2, according to the 1st target temperature (TCm1), regulate electric expansion valve (91,92,93) aperture; At step S3, liquid pipe temperature (TC2) and the size of the 2nd target temperature (TCm2) are compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), enter step S4, according to the 2nd target temperature (TCm2), regulate electronic expansion valve opening (91,92,93); If the comparative result of step S1 and S3 is, liquid pipe temperature (TC2) is greater than the 2nd target temperature (TCm2), or while being less than the 1st target temperature (TCm1), enter step S5, detect the tracheae temperature (TC1) of indoor set (101,102,103), according to tracheae temperature (TC1), regulate the aperture of electric expansion valve (91,92,93).
According to Fig. 5, illustrate multi-connected central air conditioner below and in heating process, according to target tracheae temperature (TCm), regulate the concrete grammar of electric expansion valve.As shown in the figure, while heating, at step S61, by high pressure sensor 2, detected liquid pipe pressure (Pb) numerical value of described off-premises station 1, at step S62, by described the 3rd submodule, according to off-premises station 1 liquid pipe pressure (Pb) the target setting tracheae temperature (TCm) detecting, at step S63, according to the difference of the tracheae temperature (TC1) detecting and target tracheae temperature (TCm), regulate the aperture of electric expansion valve (91,92,93), make tracheae temperature (TC1) level off to target tracheae temperature (TCm).
As from the foregoing, the control device of the multi-connected central air conditioner in present embodiment, when refrigeration control, not only according to the degree of superheat, the aperture of electric expansion valve (91,92,93) is regulated, also when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1) or is less than or equal to the 2nd target temperature (TCm2), according to the 1st target temperature (TCm1) and the 2nd target temperature (TCm2), the aperture of electric expansion valve (91,92,93) is regulated, so, even larger for pipeline internal resistance, the indoor set that cold medium flux is less, also can guarantee its refrigeration.
When heating control, not only according to tracheae temperature, the aperture of electric expansion valve (91,92,93) is regulated, also when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1) or is less than or equal to the 2nd target temperature (TCm2), according to the 1st target temperature (TCm1) and the 2nd target temperature (TCm2), the aperture of electric expansion valve (91,92,93) is regulated, so, even larger for pipeline internal resistance, the indoor set that cold medium flux is less, also can guarantee its heating effect.
The 1st target temperature (TCm1) while more than freezing and the 2nd target temperature (TCm2) the 1st target temperature (TCm1) and the 2nd target temperature (TCm2) when heating can be identical value, also different values.
The foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc.; as applicable equally for the system of only having refrigeration or only heat, within all should being included in protection scope of the present invention.
Claims (7)
1. the control device of a multi-connected central air conditioning system, there is single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, it is characterized in that
The liquid pipe temperature sensor that comprises the liquid pipe temperature (TC2) that detects indoor set, the degree of superheat detection module of detection degree of superheat SH,
When refrigeration, the refrigeration regulation module that the aperture of described electric expansion valve is regulated, described refrigeration regulation module, when being included in liquid pipe temperature (TC2) and being more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the 1st submodule of electronic expansion valve opening, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the 2nd submodule of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), and while being less than the 1st target temperature (TCm1), according to the detected degree of superheat (SH), regulate the 3rd submodule of electronic expansion valve opening.
2. the control device of a kind of multi-connected central air conditioning system according to claim 1, it is characterized in that, the tracheae temperature sensor also with the tracheae temperature (TC1) that detects indoor set, described degree of superheat detection module, according to the liquid pipe temperature (TC2) detecting and tracheae temperature (TC1) by calculating the degree of superheat (SH).
3. the control device of a kind of multi-connected central air conditioning system according to claim 1, is characterized in that,
Also there is the external environment temperature sensor that detects external environment temperature (tao), described the 3rd submodule, according to external environment temperature (tao) the target setting degree of superheat (SHm) detecting, according to the degree of superheat detecting (SH) and the difference of the target degree of superheat (SHm), regulate electronic expansion valve opening.
4. the control device of a multi-connected central air conditioning system, there is single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, it is characterized in that
Comprise the liquid pipe temperature sensor that detects indoor set liquid pipe temperature (TC2), detect the tracheae temperature sensor of the tracheae temperature (TC1) of indoor set,
When heating, what the aperture of described electric expansion valve was regulated heats regulation module, the described regulation module that heats, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the 1st submodule of electronic expansion valve opening, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the 2nd submodule of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), and while being less than the 1st target temperature (TCm1), according to detected tracheae temperature (TC1), regulate the 3rd submodule of electronic expansion valve opening.
5. the control device of a kind of multi-connected central air conditioning system according to claim 4, is characterized in that,
The high pressure sensor also with the liquid pipe pressure (Pb) that detects described off-premises station, described the 3rd submodule, according to off-premises station liquid pipe pressure (Pb) the target setting tracheae temperature (TCm) detecting, according to the tracheae temperature (TC1) detecting and the difference of target tracheae temperature (TCm), regulate electronic expansion valve opening.
6. the control method of a multi-connected central air conditioning system, described multi-connected central air conditioning system has single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, it is characterized in that
When refrigeration, comprise the step that detects indoor set liquid pipe temperature (TC2), detect the step of indoor set tracheae temperature (TC1), detect the step of the degree of superheat (SH), the step that the size of liquid pipe temperature (TC2) and the 1st target temperature (TCm1) is compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the step of electronic expansion valve opening, the step that the size of liquid pipe temperature (TC2) and the 2nd target temperature (TCm2) is compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the step of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), while being less than the 1st target temperature (TCm1), according to the degree of superheat (SH), regulate the step of electronic expansion valve opening.
7. the control method of a multi-connected central air conditioning system, described multi-connected central air conditioning system has single off-premises station and a plurality of indoor set, the tracheae of described off-premises station is connected with liquid pipe branch pipe with the tracheorrhaphy manifold of described indoor set with liquid pipe, in the described liquid pipe branch pipe of described indoor set, be provided with electric expansion valve, it is characterized in that
When heating, comprise the step that detects indoor set liquid pipe temperature (TC2), detect the step of indoor set tracheae temperature (TC1), the step that the size of liquid pipe temperature (TC2) and the 1st target temperature (TCm1) is compared, when liquid pipe temperature (TC2) is more than or equal to the 1st target temperature (TCm1), according to the 1st target temperature (TCm1), regulate the step of electronic expansion valve opening, the step that the size of liquid pipe temperature (TC2) and the 2nd target temperature (TCm2) is compared, when liquid pipe temperature (TC2) is less than or equal to the 2nd target temperature (TCm2), according to the 2nd target temperature (TCm2), regulate the step of electronic expansion valve opening, in liquid pipe temperature (TC2), be greater than the 2nd target temperature (TCm2), while being less than the 1st target temperature (TCm1), according to indoor set tracheae temperature (TC1), regulate the step of electronic expansion valve opening.
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