CN102635926A - Air conditioning system and pressure adjusting method for same - Google Patents
Air conditioning system and pressure adjusting method for same Download PDFInfo
- Publication number
- CN102635926A CN102635926A CN201210126485XA CN201210126485A CN102635926A CN 102635926 A CN102635926 A CN 102635926A CN 201210126485X A CN201210126485X A CN 201210126485XA CN 201210126485 A CN201210126485 A CN 201210126485A CN 102635926 A CN102635926 A CN 102635926A
- Authority
- CN
- China
- Prior art keywords
- pressure
- refrigerant
- aperture
- regulating unit
- premises station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses an air conditioning system and a pressure adjusting method for the same. The air conditioning system comprises an outdoor unit and at least one indoor unit. The outdoor unit comprises a pressure adjusting device; the pressure adjusting device is arranged at the refrigerant discharging pipe of the outdoor unit; the pressure adjusting device comprises a pressure sensor, a control unit and a flow adjusting unit, wherein the pressure sensor is used for detecting an actual pressure value at the refrigerant discharging pipe of the outdoor unit; the control unit is used for comparing the actual pressure value detected by the pressure sensor and a pre-set pressure threshold value, and controlling the opening of the flow adjusting unit according to a comparing result; and the flow adjusting unit is used for adjusting the flow of flowing a refrigerant of the outdoor unit under control of the control unit. According to the air conditioning system provided by the invention, hyper-normal high-drop connection between the indoor unit and outdoor unit of the air conditioning system can be realized, so that the requirement of mounting the air conditioning system, such as a multi-couple unit, within a higher drop range can be met.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly, relate to a kind of air-conditioning system and the pressure method of adjustment that is used for air-conditioning system.
Background technology
It is how online that (or off-premises station drags the air-conditioning system of many indoor sets; How online all only mention in the subsequent content) carrying out under unconventional high drop connection and the situation of off-premises station on indoor set; When unit carries out cooling operation; Because the high drop between the indoor and outdoor machine makes refrigerant in the liquid line before getting into the indoor set choke valve, produces bigger head of liquid.Under high temperature refrigeration condition, if this head of liquid without reduced pressure treatment, the pressure of liquid cooling matchmaker before the indoor set electric expansion valve will surpass the design pressure of refrigerant system and cause danger.
In recent years, how online product has combined and arranged freely, good sub-load efficient, method for using and convenient advantage such as flexibly is installed flexibly with it, more and more receives user's welcome, and its market capacity also rises continuing.But, at present great majority how online can only satisfy the high drop of indoor and outdoor machine 50 meters with the interior requirement of installing and using, can't satisfy the higher construction and installation instructions for use of story height.One of them very important reasons be exactly unit when carrying out the high temperature cooling operation, can't effectively solve between the indoor and outdoor machine and cause dangerous problem to system because of excessive high drop produces excessive liquid pipe head of liquid.
Because current urban architecture land used is more and more rare; Skyscraper will get more and more; The height of these buildings much all can be above 100 meters; And at present great majority how online can only satisfy the high drop of indoor and outdoor machine 50 meters with the interior requirement of installing and using, can't satisfy the requirement of installing and using of this type skyscraper.In order to satisfy the install and use demand of these skyscrapers to how online product, be badly in need of on existing many online group, innovating, solve many online group system under unconventional high drop (more than 50 meters) mounting condition and occur dangerous problem easily.
Cause dangerous problem because of excessive high drop produces excessive liquid pipe head of liquid to system to can't effectively solving in the correlation technique between the indoor and outdoor machine, do not propose effective solution at present as yet.
Summary of the invention
Because of producing excessive liquid pipe head of liquid, excessive high drop causes dangerous problem to can't effectively solving in the correlation technique between the indoor and outdoor machine to system; The present invention proposes a kind of pressure regulation method and device of air-conditioning equipment; Can solve under unconventional high drop connects; Pressure before the indoor set electric expansion valve surpasses the design pressure of refrigerant system and the problem of causing danger; Thereby realize that unconventional high drop connects between the how online indoor and outdoor machine, to satisfy how online demand of installing at bigger high fall range.
Technical scheme of the present invention is achieved in that
According to an aspect of the present invention, a kind of air-conditioning system is provided.
This system comprises: off-premises station and at least one indoor set; This off-premises station comprises pressure regulation device; Pressure regulation device is arranged on the refrigerant discharge pipe place of off-premises station, and this pressure regulation device comprises pressure sensor, control module and flow regulating unit, wherein:
Pressure sensor is used to detect the actual pressure value at the refrigerant discharge pipe place of off-premises station;
The actual pressure value that control module is used for pressure sensor is detected compares with predetermined pressure threshold, and controls the aperture of flow regulating unit according to comparative result;
Flow regulating unit is used for the flow that adjustment outdoor unit cold matchmaker is flowed out under the control of control module.
Wherein, flow regulating unit comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, these a plurality of expansion valves were connected in parallel;
And control module is used for adjusting one by one or simultaneously the aperture of a plurality of expansion valves.
This flow regulating unit further comprises at least one electric valve, and this electric valve has opening and closed condition, and at least one electric valve is parallelly connected with at least one expansion valve;
And control module is further used for controlling and partly or entirely is in opening or closed condition at least one electric valve.
In addition, control module is used for controlling in the following manner the aperture of flow regulating unit:
When P1＜P1m; Increase the aperture of at least one expansion valve of pressure regulation device; If the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m, then make part or all of electric valve be in opening, and adjust the aperture of at least one expansion valve so that P1=P1m;
When P1＞P1m, reduce the aperture of at least one expansion valve, if the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of at least one expansion valve so that P1=P1m;
Wherein, P1 is an actual pressure value, and P1m is predetermined pressure threshold.
This pressure regulation device further comprises:
Fluid reservoir is connected between flow regulating unit and the efferent duct, is used to store the refrigerant of flow regulating unit output, and the part of the liquid in the refrigerant of storage is exported via efferent duct.
This pressure regulation device also further comprises:
Temperature sensor is used to detect the actual temperature of the refrigerant discharge pipe place refrigerant of off-premises station;
And; Control module is further used for being higher than under the situation of predetermined temperature threshold in the actual temperature value that temperature sensor detects, and reduces the aperture of flow regulating unit, wherein; Be higher than in actual temperature under the situation of predetermined temperature threshold, the degree of supercooling of expression refrigerant is not enough.
And predetermined pressure threshold obtains through following formula:
P1m＝Pmax-Pk；
Wherein, P1m is predetermined pressure threshold, and Pmax is the maximum design pressure of air-conditioning system; Wherein, Pk=Δ P+Py, and; Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of off-premises station employing, and g is an acceleration of gravity; H is the drop height between off-premises station and the indoor set, and Py is the parameter regulation surplus, and Py >=0kpa.
According to another aspect of the present invention; A kind of pressure method of adjustment that is used for air-conditioning system is provided, has it is characterized in that, this pressure method of adjustment comprises off-premises station and at least one indoor set; This off-premises station comprises pressure regulation device; This pressure regulation device is arranged on the refrigerant discharge pipe place of off-premises station, and pressure regulation device comprises pressure sensor, control module and flow regulating unit.
This pressure method of adjustment comprises:
Pressure sensor detects the actual pressure value at the refrigerant discharge pipe place of off-premises station;
Control module compares the actual pressure value that pressure sensor detects with predetermined pressure threshold, and controls the aperture of flow regulating unit according to comparative result;
Under the control of control module, the flow that flow regulating unit adjustment off-premises station refrigerant flows out.
Wherein, this flow regulating unit comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, these a plurality of expansion valves were connected in parallel;
And when the flow that adjustment off-premises station refrigerant flows out, control module is adjusted the aperture of a plurality of expansion valves one by one or simultaneously.
In addition, flow regulating unit further comprises at least one electric valve, and electric valve has opening and closed condition, and at least one electric valve is parallelly connected with at least one expansion valve;
And when the flow that adjustment off-premises station refrigerant flows out, control module is further controlled and partly or entirely is in opening or closed condition at least one electric valve.
In addition, the aperture of control module control flow regulating unit comprises:
When P1＜P1m; Increase the aperture of at least one expansion valve of pressure regulation device; If the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m, then make part or all of electric valve be in opening, and adjust the aperture of at least one expansion valve so that P1=P1m;
When P1＞P1m, reduce the aperture of at least one expansion valve, if the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of at least one expansion valve so that P1=P1m;
Wherein, P1 is an actual pressure value, and P1m is predetermined pressure threshold.
And, the adjusted refrigerant of flow is comprised through the efferent duct discharge:
The refrigerant that flow regulating unit is exported exports refrigerant to fluid reservoir, and fluid reservoir is stored the refrigerant of flow regulating unit output, and the part of the liquid in the refrigerant of storage is exported via efferent duct, and wherein, fluid reservoir is connected between flow regulating unit and the efferent duct.
This pressure method of adjustment also further comprises:
Detect the actual temperature of the refrigerant discharge pipe place refrigerant of off-premises station through temperature sensor;
And the actual temperature value that detects at temperature sensor is higher than under the situation of predetermined temperature threshold, and control module reduces the aperture of flow regulating unit, wherein, is higher than in actual temperature under the situation of predetermined temperature threshold, and the degree of supercooling of expression refrigerant is not enough.
Obtain predetermined pressure threshold through following formula in advance:
P1m＝Pmax-Pk；
Wherein, P1m is predetermined pressure threshold, and Pmax is the maximum design pressure of air-conditioning system; Wherein, Pk=Δ P+Py, and; Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of off-premises station employing, and g is an acceleration of gravity; H is the drop height between off-premises station and the indoor set, and Py is the parameter regulation surplus, and Py >=0kpa.
The present invention at off-premises station (for example passes through; The off-premises station of multi-online air-conditioning system) pressure regulation device that is provided with in the refrigerant discharge pipe in; Regulate the flow that the off-premises station refrigerant flows out, can solve when unconventional high drop connects, the pressure before the indoor set expansion valve surpasses the design pressure of refrigerant system and the problem of causing danger; Thereby realize that unconventional high drop connects between the air-conditioning system indoor and outdoor machine, to satisfy how online demand of installing at bigger high fall range.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the block diagram according to the air-conditioning system of the embodiment of the invention;
Fig. 2 is the block diagram according to the concrete structure instance of the air-conditioning system of the embodiment of the invention;
Fig. 3 is the block diagram according to another concrete structure instance of the air-conditioning system of the embodiment of the invention;
Fig. 4 is the block diagram of a concrete structure instance again according to the air-conditioning system of the embodiment of the invention;
Fig. 5 is the flow chart according to the pressure method of adjustment of the air-conditioning system of the embodiment of the invention;
Fig. 6 is the flow chart according to pressure judgement and aperture adjustment process in the pressure method of adjustment of the air-conditioning system of the embodiment of the invention;
Fig. 7 is the flow chart according to temperature judgement and aperture adjustment process in the pressure method of adjustment of the air-conditioning system of the embodiment of the invention.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained belongs to the scope that the present invention protects.
According to embodiments of the invention, a kind of air-conditioning system is provided.
As shown in Figure 1, comprise according to the air-conditioning system of the embodiment of the invention:
Off-premises station 1 and at least one indoor set 2; The off-premises station of this air-conditioning system comprises pressure regulation device 3; Pressure regulation device 3 is arranged on the refrigerant discharge pipe (not shown) place of air-conditioner outdoor unit 1; And this pressure regulation device 3 comprises pressure sensor 31, control module 32 and flow regulating unit 33, wherein:
The actual pressure value that control module 32 is used for pressure sensor 31 is detected compares with predetermined pressure threshold, and controls the aperture of flow regulating unit according to comparative result;
Flow regulating unit 33 is used for the flow that adjustment air-conditioner outdoor unit refrigerant flows out under the control of control module 32.
Wherein, this flow regulating unit 33 comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, then these a plurality of expansion valves were connected in parallel;
And control module 32 also is used for one by one or adjusts simultaneously the aperture of a plurality of expansion valves.
In addition, preferably, this flow regulating unit 33 can further include at least one electric valve, and this electric valve has opening and closed condition, and at least one electric valve and at least one expansion valve are connected in parallel;
This control module 32 is further used for controlling and partly or entirely is in opening or closed condition at least one electric valve.
For example, when the bore of expansion valve was enough big, control module 32 can be controlled electric valve and be in closed condition or electric valve is not set.
In addition, control module 32 is used for controlling in the following manner the aperture of flow regulating unit:
When P1＜P1m; Increase the aperture of at least one expansion valve in the pressure regulation device; If when the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m, then make part or all of electric valve be in opening, and adjust the aperture of at least one expansion valve so that P1=P1m;
When P1＞P1m, reduce the aperture of at least one expansion valve, if when the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of at least one expansion valve so that P1=P1m;
Wherein, the original state of expansion valve and electric valve is set according to the characteristics of system by the designer.
And P1 is an actual pressure value, and P1m is predetermined pressure threshold.
This pressure regulation device also further comprises: the fluid reservoir (not shown), be connected between flow regulating unit and the efferent duct, and be used to store the refrigerant of flow regulating unit output, and the part of the liquid in the refrigerant of storage is exported via efferent duct.
For example; Through the deficiency of the liquid refrigerant degree of supercooling after the condenser condenses time; Liquid refrigerant can form gas-liquid mixed state cold-producing medium after because of pressure regulation device step-down throttling, because the input pipe of fluid reservoir and the bottom that efferent duct can be positioned at fluid reservoir, causes the unbalanced problem of each indoor set refrigeration so can avoid cold-producing medium because of the gas-liquid mixed attitude to flow to the indoor through this fluid reservoir; Can guarantee to have only liquid refrigerant to flow to indoor set.
As shown in Figure 2, can comprise compressor in the air-conditioning system, blast pipe, air intake duct, gas-liquid separator, pressure sensor Pd (being different from the pressure sensor P1 in the pressure regulation device), oil eliminator, cross valve, condenser, throttling arrangement, EEV; In pressure regulation device (this device is built-in decompressor); Comprise expansion valve (for example, can be electric expansion valve EEVJ1), electric valve (for example, can be magnetic valve SVJ), pressure sensor P1 and fluid reservoir; The quantity of electric valve and electric expansion valve can be one or more; And, when the bore of electric expansion valve is big, electric valve can be installed.
In another embodiment, this pressure regulation device also further comprises:
Temperature sensor is used to detect the actual temperature of locating refrigerant of the refrigerant discharge pipe of off-premises station;
And; Control module is further used for being higher than under the situation of predetermined temperature threshold in the actual temperature value that temperature sensor detects, and reduces the aperture of flow regulating unit, wherein; Be higher than in actual temperature under the situation of predetermined temperature threshold, the degree of supercooling of expression refrigerant is not enough.
As shown in Figure 3, in another example, can comprise subcooler and EEVJ2 in the air-conditioning system, and, in pressure regulation device, may further include temperature sensor.In instance shown in Figure 3; Because outdoor unit has adopted subcooler; When cooling operation; Can be the liquid pipe is further cold excessively through subcooler, obtain enough degree of supercoolings and make T1＜P1_Temp (T1 is that liquid pipe temperature, the P1_Temp when getting into pressure regulation device is the corresponding saturation temperature of P1 pressure), even make the cold-producing medium process pressure regulation device decompression in the liquid pipe also can throttling not become the gas-liquid mixed state; The situation that gas-liquid mixed attitude cold-producing medium gets into indoor set can not occur, so can not use fluid reservoir under this situation.
In addition, as shown in Figure 4 in another example, also can use fluid reservoir and temperature sensor simultaneously, thereby avoid the refrigerant of gas-liquid mixed to flow into indoor set better.
In addition, alternatively, predetermined pressure threshold obtains through following formula:
P1m＝Pmax-Pk；
Wherein, P1m is predetermined pressure threshold, and Pmax is the maximum design pressure of air-conditioning system, wherein; Pk=Δ P+Py, and Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of off-premises station employing; G is an acceleration of gravity, and H is that (for example, the H value can be set at this air-conditioning system and allow the maximum high drop installed for drop height between off-premises station and the indoor set; Also can set according to the high drop of actual installation is on-the-spot), Py is the parameter regulation surplus, and Py >=0kpa.
It should be noted that; In an air-conditioning system, the quantity of off-premises station also can be a plurality of, at this moment; Each off-premises station can corresponding a plurality of indoor sets; And each off-premises station can be provided with a pressure regulation device accordingly, and a plurality of indoor sets that pressure sensor is corresponding with this off-premises station connect, and its operation principle is the same.
According to embodiments of the invention, a kind of pressure method of adjustment that is used for air-conditioning system is provided also.
Air-conditioning system according to the embodiment of the invention comprises off-premises station and at least one indoor set; This air-conditioner outdoor unit comprises pressure regulation device; This pressure regulation device is arranged on the refrigerant discharge pipe place of off-premises station; And pressure regulation device comprises pressure sensor, control module and flow regulating unit.
As shown in Figure 5, the pressure method of adjustment that is applied to this air-conditioning system comprises:
Step S501, pressure sensor detects the actual pressure value at the refrigerant discharge pipe place of off-premises station;
Step S503, control module compares the actual pressure value that pressure sensor detects with predetermined pressure threshold, and controls the aperture of flow regulating unit according to comparative result;
Step S505, under the control of control module, the flow that flow regulating unit adjustment off-premises station refrigerant flows out.
Wherein, this flow regulating unit comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, these a plurality of expansion valves were connected in parallel;
And when the flow that adjustment off-premises station refrigerant flows out, control module is adjusted the aperture of a plurality of expansion valves one by one or simultaneously.
In addition, flow regulating unit further comprises at least one electric valve, and electric valve has opening and closed condition, and at least one electric valve is parallelly connected with at least one expansion valve;
And when the flow that adjustment off-premises station refrigerant flows out, control module is further controlled and partly or entirely is in opening or closed condition at least one electric valve.
For example, when the bore of expansion valve was enough big, control module can be controlled electric valve and be in closed condition or electric valve is not set.
In addition, the aperture of control module control flow regulating unit comprises:
When P1＜P1m; Increase the aperture of at least one expansion valve of pressure regulation device; If the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m, then make part or all of electric valve be in opening, and adjust the aperture of at least one expansion valve so that P1=P1m;
When P1＞P1m, reduce the aperture of at least one expansion valve, if the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of at least one expansion valve so that P1=P1m;
Wherein, P1 is an actual pressure value, and P1m is predetermined pressure threshold.
And, the adjusted refrigerant of flow is comprised through the efferent duct discharge:
The refrigerant that flow regulating unit is exported exports refrigerant to fluid reservoir, and fluid reservoir is stored the refrigerant of flow regulating unit output, and the part of the liquid in the refrigerant of storage is exported via efferent duct, and wherein, fluid reservoir is connected between flow regulating unit and the efferent duct.
For example; Through the deficiency of the liquid refrigerant degree of supercooling after the condenser condenses time; Liquid refrigerant can form gas-liquid mixed state cold-producing medium after because of pressure regulation device step-down throttling, can avoid cold-producing medium because of the gas-liquid mixed attitude to flow to the indoor through this fluid reservoir and cause the unbalanced problem of each indoor set refrigeration.
And this method can obtain predetermined pressure threshold through following formula in advance:
P1m＝Pmax-Pk；
Wherein, P1m is predetermined pressure threshold, and Pmax is the maximum design pressure of air-conditioning system, wherein; Pk=Δ P+Py, and Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of off-premises station employing; G is an acceleration of gravity, and H is that (for example, the H value can be set at this air-conditioning system and allow the maximum high drop installed for drop height between off-premises station and the indoor set; Also can set according to the high drop of actual installation is on-the-spot), Py is the parameter regulation surplus, and Py >=0kpa.
As shown in Figure 6, according to the parameter of above-mentioned setting judge and the adjustment expansion valve (for example, EEVJ1) and the process of electric valve (for example, magnetic valve SVJ) following:
At first, confirm that off-premises station is installed in the indoor set top; Secondly, according to the original state (can also can set) of characteristics setting SVJ of system and EEVJ1 by system-computed by operating personnel are artificial, and decompression control parameter Pk and the maximum design pressure Pmax of system, and calculating target control pressure P 1m=Pmax-Pk; At last, when cooling operation, actual pressure P1 in the detected pressures adjusting device, 1m compares with the target control pressure P:
When P1=P1m, SVJ and EEVJ1 keep current state.
When P1 ≠ P1m,, carry out the control of EEVJ1 aperture again after opening SVJ if P1＜P1m reaches still P1＜P1m of maximum if according to the target of P1=P1m EEVJ1 in the pressure regulation device is opened big EEVJ1 gradually; If P1＞and during P1m, turn down the EEVJ1 aperture gradually according to the target of P1=P1m, if closing minimum, EEVJ1 still can't reach the control target, carry out the control of EEVJ1 aperture again after turning off SVJ.
Alternatively, this pressure method of adjustment can further include:
Detect the actual temperature of the refrigerant discharge pipe place refrigerant of off-premises station through temperature sensor;
And the actual temperature value that detects at temperature sensor is higher than under the situation of predetermined temperature threshold, and control module reduces the aperture of flow regulating unit, wherein, is higher than in actual temperature under the situation of predetermined temperature threshold, and the degree of supercooling of expression refrigerant is not enough.
For example, as shown in Figure 7, when controlling, at first, confirm that off-premises station is installed in the indoor set top; Secondly; According to the original state (can also can set) of characteristics setting SVJ of system and EEVJ1 by system-computed by operating personnel are artificial, and decompression control parameter Pk and the maximum design pressure Pmax of system; And calculate target control pressure P 1m=Pmax-Pk and target temperature T1m=P1_Temp-Tm; At last, when cooling operation, actual pressure P1 and actual temperature T1 and target control pressure P 1m and target temperature T1m compare in the detected pressures adjusting device.
When P1=P1m, SVJ and EEVJ1 keep current state.
When P1 ≠ P1m,, carry out the control of EEVJ1 aperture again after opening SVJ if P1＜P1m reaches still P1＜P1m of maximum if according to the target of P1=P1m EEVJ1 in the pressure regulation device is opened big EEVJ1 gradually; If P1＞and during P1m, turn down the EEVJ1 aperture gradually according to the target of P1=P1m, if closing minimum, EEVJ1 still can't reach the control target, carry out the control of EEVJ1 aperture again after turning off SVJ.
When T1=T1m, EEVJ2 keeps current state.
When T1 ≠ T1m, according to the target control EEVJ2 aperture of T1=T1m: when T1＜T1m, EEVJ2 is turned down gradually according to the target of T1=T1m; When T1＞T1m, open big EEVJ2 aperture gradually according to the target of T1=T1m.If the liquid refrigerant degree of supercooling through after the condenser condenses is enough big, can satisfy T1＜P1_Temp, there is not subcooler can adopt this pressure regulation device in the outdoor unit yet.
In sum; By means of technique scheme of the present invention; Unconventional high drop above off-premises station is installed in indoor set (more than 50 meters) installation situation can solve under unconventional high drop connects through selecting to adopt pressure regulation device of the present invention and pressure method of adjustment; Pressure before the indoor set expansion valve surpasses the design pressure of refrigerant system and the problem of causing danger, to satisfy user's instructions for use.Equally, in the unit of in the high fall range of routine, installing, also can adopt the present invention to realize the effect of pressure adjustment, make system's operation safer.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. air-conditioning system; It is characterized in that; Comprise off-premises station and at least one indoor set, said off-premises station comprises pressure regulation device, and said pressure regulation device is arranged on the refrigerant discharge pipe place of said off-premises station; Said pressure regulation device comprises pressure sensor, control module and flow regulating unit, wherein:
Said pressure sensor is used to detect the actual pressure value at the refrigerant discharge pipe place of said off-premises station;
The actual pressure value that said control module is used for pressure sensor is detected compares with predetermined pressure threshold, and controls the aperture of said flow regulating unit according to comparative result;
Said flow regulating unit is used for the flow that the said off-premises station refrigerant of adjustment flows out under the control of said control module.
2. air-conditioning system according to claim 1 is characterized in that said flow regulating unit comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, said a plurality of expansion valves were connected in parallel;
And said control module is used for adjusting one by one or simultaneously the aperture of said a plurality of expansion valves.
3. air-conditioning system according to claim 2; It is characterized in that; Said flow regulating unit further comprises at least one electric valve, and said electric valve has opening and closed condition, and said at least one electric valve is parallelly connected with said at least one expansion valve;
And said control module is further used for controlling and partly or entirely is in opening or closed condition in said at least one electric valve.
4. air-conditioning system according to claim 3 is characterized in that, said control module is used for controlling in the following manner the aperture of said flow regulating unit:
When P1＜P1m; Increase the aperture of said at least one expansion valve of said pressure regulation device; If the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m; Then make part or all of electric valve be in opening, and adjust the aperture of said at least one expansion valve so that P1=P1m;
When P1＞P1m; Reduce the aperture of said at least one expansion valve; If the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of said at least one expansion valve so that P1=P1m;
Wherein, P1 is said actual pressure value, and P1m is said predetermined pressure threshold.
5. pressure regulation device according to claim 1 is characterized in that, further comprises:
Fluid reservoir is connected between said flow regulating unit and the said efferent duct, is used to store the refrigerant of said flow regulating unit output, and the part of the liquid in the said refrigerant that will store is via said efferent duct output.
6. air-conditioning system according to claim 1 is characterized in that, further comprises:
Temperature sensor is used to detect the actual temperature of the refrigerant discharge pipe place refrigerant of said off-premises station;
And; Said control module is further used for being higher than under the situation of predetermined temperature threshold in the actual temperature value that said temperature sensor detects; Reduce the aperture of said flow regulating unit; Wherein, be higher than in said actual temperature under the situation of said predetermined temperature threshold, represent that the degree of supercooling of said refrigerant is not enough.
7. air-conditioning system according to claim 1 is characterized in that, said predetermined pressure threshold obtains through following formula:
P1m＝Pmax-Pk；
Wherein, P1m is said predetermined pressure threshold, and Pmax is the maximum design pressure of said air-conditioning system; Wherein, Pk=Δ P+Py, and; Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of said off-premises station employing, and g is an acceleration of gravity; H is the drop height between said off-premises station and the indoor set, and Py is the parameter regulation surplus, and Py >=0kpa.
8. pressure method of adjustment that is used for air-conditioning system; It is characterized in that; Said air-conditioning system comprises off-premises station and at least one indoor set, and said off-premises station comprises pressure regulation device, and said pressure regulation device is arranged on the refrigerant discharge pipe place of said off-premises station; Said pressure regulation device comprises pressure sensor, control module and flow regulating unit, and said pressure method of adjustment comprises:
Said pressure sensor detects the actual pressure value at the refrigerant discharge pipe place of said off-premises station;
Said control module compares the actual pressure value that pressure sensor detects with predetermined pressure threshold, and controls the aperture of said flow regulating unit according to comparative result;
Under the control of said control module, said flow regulating unit is adjusted the flow that said off-premises station refrigerant flows out.
9. pressure method of adjustment according to claim 8 is characterized in that said flow regulating unit comprises at least one expansion valve, and under the quantity of expansion valve was a plurality of situation, said a plurality of expansion valves were connected in parallel;
And when the flow that the said off-premises station refrigerant of adjustment flows out, said control module is adjusted the aperture of said a plurality of expansion valves one by one or simultaneously.
10. pressure method of adjustment according to claim 9; It is characterized in that; Said flow regulating unit further comprises at least one electric valve, and said electric valve has opening and closed condition, and said at least one electric valve is parallelly connected with said at least one expansion valve;
And when the flow that the said off-premises station refrigerant of adjustment flows out, said control module further partly or entirely is in opening or closed condition in said at least one electric valve of control.
11. pressure method of adjustment according to claim 10 is characterized in that, the aperture that said control module is controlled said flow regulating unit comprises:
When P1＜P1m; Increase the aperture of said at least one expansion valve of said pressure regulation device; If the aperture of all expansion valves reaches maximum and still satisfies P1＜P1m; Then make part or all of electric valve be in opening, and adjust the aperture of said at least one expansion valve so that P1=P1m;
When P1＞P1m; Reduce the aperture of said at least one expansion valve; If the aperture of all expansion valves reaches minimum and still satisfies P1＞P1m, then make part or all of electric valve be in closed condition, and adjust the aperture of said at least one expansion valve so that P1=P1m;
Wherein, P1 is said actual pressure value, and P1m is said predetermined pressure threshold.
12. pressure method of adjustment according to claim 8 is characterized in that, the adjusted refrigerant of flow is discharged through said efferent duct comprise:
The refrigerant of said flow regulating unit output exports refrigerant to fluid reservoir; Said fluid reservoir is stored the refrigerant of said flow regulating unit output; And the part of the liquid in the said refrigerant that will store is via said efferent duct output; Wherein, said fluid reservoir is connected between said flow regulating unit and the said efferent duct.
13. pressure method of adjustment according to claim 8 is characterized in that, further comprises:
Detect the actual temperature of the refrigerant discharge pipe place refrigerant of said off-premises station through temperature sensor;
And; The actual temperature value that detects at said temperature sensor is higher than under the situation of predetermined temperature threshold, and said control module reduces the aperture of said flow regulating unit, wherein; Be higher than in said actual temperature under the situation of said predetermined temperature threshold, represent that the degree of supercooling of said refrigerant is not enough.
14. the pressure method of adjustment of air-conditioning system according to claim 8 is characterized in that, obtains said predetermined pressure threshold through following formula in advance:
P1m＝Pmax-Pk；
Wherein, P1m is said predetermined pressure threshold, and Pmax is the maximum design pressure of said air-conditioning system; Wherein, Pk=Δ P+Py, and; Δ P=ρ gH, ρ are the density of refrigerant saturated liquid under maximum condensing pressure of said off-premises station employing, and g is an acceleration of gravity; H is the drop height between said off-premises station and the indoor set, and Py is the parameter regulation surplus, and Py >=0kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210126485.XA CN102635926B (en) | 2012-04-26 | 2012-04-26 | Air-conditioning system and pressure method of adjustment for air-conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210126485.XA CN102635926B (en) | 2012-04-26 | 2012-04-26 | Air-conditioning system and pressure method of adjustment for air-conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102635926A true CN102635926A (en) | 2012-08-15 |
| CN102635926B CN102635926B (en) | 2018-08-24 |
Family
ID=46620423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210126485.XA Active CN102635926B (en) | 2012-04-26 | 2012-04-26 | Air-conditioning system and pressure method of adjustment for air-conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102635926B (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104456739A (en) * | 2014-12-26 | 2015-03-25 | 珠海格力电器股份有限公司 | Air conditioner system and control method |
| CN104748293A (en) * | 2013-12-30 | 2015-07-01 | 海尔集团公司 | Method for controlling air conditioning super-cooling degree through pressure sensor |
| CN105716164A (en) * | 2016-03-25 | 2016-06-29 | 青岛海尔空调电子有限公司 | Water-cooled multi-split unit system |
| CN106152375A (en) * | 2015-03-27 | 2016-11-23 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and control method thereof |
| CN106152376A (en) * | 2015-03-30 | 2016-11-23 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and control method thereof |
| CN106482242A (en) * | 2015-08-31 | 2017-03-08 | 青岛海尔空调电子有限公司 | Replace shape multi-connected machine off-premises station and its control method |
| CN107084510A (en) * | 2017-06-21 | 2017-08-22 | 珠海格力电器股份有限公司 | High drop control method, the device and system of multiple on-line system |
| CN107270517A (en) * | 2017-07-26 | 2017-10-20 | 美的集团武汉制冷设备有限公司 | Air-conditioning system, the control device of air-conditioning system and method |
| CN107449110A (en) * | 2017-07-26 | 2017-12-08 | 美的集团武汉制冷设备有限公司 | Air-conditioning system, the control device of air-conditioning system and method |
| CN107894112A (en) * | 2017-11-09 | 2018-04-10 | 珠海格力电器股份有限公司 | High drop method of controlling security and air-conditioning system |
| CN108195050A (en) * | 2017-12-07 | 2018-06-22 | 青岛海尔空调电子有限公司 | Multi-split air conditioner standby continuous running control method and multi-split air conditioner |
| CN110431356A (en) * | 2017-03-31 | 2019-11-08 | 大金工业株式会社 | Difference of height sets system |
| WO2020015285A1 (en) * | 2018-07-17 | 2020-01-23 | 珠海格力电器股份有限公司 | Method and system for controlling pressure of air conditioning unit, and computer device and storage medium |
| CN111895671A (en) * | 2019-05-05 | 2020-11-06 | 维谛技术有限公司 | Air conditioning system |
| CN113260823A (en) * | 2018-11-20 | 2021-08-13 | 里姆制造公司 | Expansion valve with selectable operating modes |
| CN114151935A (en) * | 2021-12-07 | 2022-03-08 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN114484587A (en) * | 2022-02-16 | 2022-05-13 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner refrigerant balance control method and system and multi-split air conditioner |
| CN115751663A (en) * | 2022-11-28 | 2023-03-07 | 贵州电网有限责任公司 | Automatic regulating device and method for heat dissipation load of central air conditioner external unit |
| CN115854427A (en) * | 2022-11-28 | 2023-03-28 | 贵州电网有限责任公司 | Gear and rack driving adjusting device and method for heat dissipation load of central air conditioner external unit |
| WO2023207040A1 (en) * | 2022-04-26 | 2023-11-02 | 青岛海尔空调电子有限公司 | Multi-split air conditioner, and method and apparatus for controlling same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083204A (en) * | 1992-08-18 | 1994-03-02 | 朱日昭 | A kind of Automatic adjustment method of refrigerant flow and device |
| CN2901189Y (en) * | 2006-04-18 | 2007-05-16 | 广东美的电器股份有限公司 | Cold medium regulator for air conditioner |
| CN201184714Y (en) * | 2008-03-09 | 2009-01-21 | 金正淼 | Multipath expansion etherealization mechanism for heat pump water heater |
| CN101358779A (en) * | 2008-09-25 | 2009-02-04 | 上海交通大学 | Carbon dioxide air conditioning system for vehicle |
| CN102165272A (en) * | 2009-03-30 | 2011-08-24 | 三菱重工业株式会社 | Multiple air conditioner |
| CN201964699U (en) * | 2011-02-23 | 2011-09-07 | 宁波奥克斯电气有限公司 | Combined throttle device of electronic expansion valve |
-
2012
- 2012-04-26 CN CN201210126485.XA patent/CN102635926B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083204A (en) * | 1992-08-18 | 1994-03-02 | 朱日昭 | A kind of Automatic adjustment method of refrigerant flow and device |
| CN2901189Y (en) * | 2006-04-18 | 2007-05-16 | 广东美的电器股份有限公司 | Cold medium regulator for air conditioner |
| CN201184714Y (en) * | 2008-03-09 | 2009-01-21 | 金正淼 | Multipath expansion etherealization mechanism for heat pump water heater |
| CN101358779A (en) * | 2008-09-25 | 2009-02-04 | 上海交通大学 | Carbon dioxide air conditioning system for vehicle |
| CN102165272A (en) * | 2009-03-30 | 2011-08-24 | 三菱重工业株式会社 | Multiple air conditioner |
| CN201964699U (en) * | 2011-02-23 | 2011-09-07 | 宁波奥克斯电气有限公司 | Combined throttle device of electronic expansion valve |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748293A (en) * | 2013-12-30 | 2015-07-01 | 海尔集团公司 | Method for controlling air conditioning super-cooling degree through pressure sensor |
| CN104748293B (en) * | 2013-12-30 | 2018-09-14 | 海尔集团公司 | A kind of air-conditioning degree of supercooling control method using pressure sensor |
| CN104456739B (en) * | 2014-12-26 | 2017-03-01 | 珠海格力电器股份有限公司 | A kind of air conditioning system and control method |
| CN104456739A (en) * | 2014-12-26 | 2015-03-25 | 珠海格力电器股份有限公司 | Air conditioner system and control method |
| CN106152375A (en) * | 2015-03-27 | 2016-11-23 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and control method thereof |
| CN106152375B (en) * | 2015-03-27 | 2019-04-12 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and its control method |
| CN106152376B (en) * | 2015-03-30 | 2019-10-22 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and its control method |
| CN106152376A (en) * | 2015-03-30 | 2016-11-23 | 青岛海尔空调电子有限公司 | High drop multi-online air-conditioning system and control method thereof |
| CN106482242A (en) * | 2015-08-31 | 2017-03-08 | 青岛海尔空调电子有限公司 | Replace shape multi-connected machine off-premises station and its control method |
| CN106482242B (en) * | 2015-08-31 | 2019-10-22 | 青岛海尔空调电子有限公司 | Replaced type multi-connected machine outdoor unit and its control method |
| CN105716164B (en) * | 2016-03-25 | 2019-05-24 | 青岛海尔空调电子有限公司 | A kind of water-cooled multi-connected machine system |
| CN105716164A (en) * | 2016-03-25 | 2016-06-29 | 青岛海尔空调电子有限公司 | Water-cooled multi-split unit system |
| CN110431356A (en) * | 2017-03-31 | 2019-11-08 | 大金工业株式会社 | Difference of height sets system |
| CN107084510A (en) * | 2017-06-21 | 2017-08-22 | 珠海格力电器股份有限公司 | High drop control method, the device and system of multiple on-line system |
| CN107449110A (en) * | 2017-07-26 | 2017-12-08 | 美的集团武汉制冷设备有限公司 | Air-conditioning system, the control device of air-conditioning system and method |
| CN107270517A (en) * | 2017-07-26 | 2017-10-20 | 美的集团武汉制冷设备有限公司 | Air-conditioning system, the control device of air-conditioning system and method |
| CN107894112B (en) * | 2017-11-09 | 2020-02-07 | 珠海格力电器股份有限公司 | High-fall safety control method and air conditioning system |
| CN107894112A (en) * | 2017-11-09 | 2018-04-10 | 珠海格力电器股份有限公司 | High drop method of controlling security and air-conditioning system |
| CN108195050B (en) * | 2017-12-07 | 2020-06-16 | 青岛海尔空调电子有限公司 | Backup continuous operation control method for multi-split air conditioner and multi-split air conditioner |
| CN108195050A (en) * | 2017-12-07 | 2018-06-22 | 青岛海尔空调电子有限公司 | Multi-split air conditioner standby continuous running control method and multi-split air conditioner |
| WO2020015285A1 (en) * | 2018-07-17 | 2020-01-23 | 珠海格力电器股份有限公司 | Method and system for controlling pressure of air conditioning unit, and computer device and storage medium |
| CN113260823A (en) * | 2018-11-20 | 2021-08-13 | 里姆制造公司 | Expansion valve with selectable operating modes |
| CN113260823B (en) * | 2018-11-20 | 2023-02-17 | 里姆制造公司 | Expansion valve with selectable operating modes |
| CN111895671A (en) * | 2019-05-05 | 2020-11-06 | 维谛技术有限公司 | Air conditioning system |
| CN114151935A (en) * | 2021-12-07 | 2022-03-08 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN114484587A (en) * | 2022-02-16 | 2022-05-13 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner refrigerant balance control method and system and multi-split air conditioner |
| WO2023207040A1 (en) * | 2022-04-26 | 2023-11-02 | 青岛海尔空调电子有限公司 | Multi-split air conditioner, and method and apparatus for controlling same |
| CN115751663A (en) * | 2022-11-28 | 2023-03-07 | 贵州电网有限责任公司 | Automatic regulating device and method for heat dissipation load of central air conditioner external unit |
| CN115854427A (en) * | 2022-11-28 | 2023-03-28 | 贵州电网有限责任公司 | Gear and rack driving adjusting device and method for heat dissipation load of central air conditioner external unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102635926B (en) | 2018-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102635926A (en) | Air conditioning system and pressure adjusting method for same | |
| CN101509693B (en) | Control method of frequency conversion heat pump outdoor machine of air-conditioner electronic expansion valve | |
| CN101113834B (en) | Method of controlling air conditioner | |
| US9151522B2 (en) | Air conditioner and control method thereof | |
| CN113536525A (en) | Global optimal energy-saving control method for central air conditioner | |
| CN104596023B (en) | Air regulator and its control method | |
| CN104713195A (en) | Air conditioner and method of controlling an air conditioner | |
| CN110671777B (en) | Control method and device of air conditioner and air conditioner | |
| CN105299979A (en) | Oil-returning control method and oil-returning device for compressor as well as air conditioner | |
| US9587865B2 (en) | Air conditioner and method for controlling the same | |
| CN102635927A (en) | Pressure adjusting device and method for air conditioning systems | |
| CN204786771U (en) | Air conditioner | |
| CN104748443B (en) | Air conditioner | |
| CN103808091A (en) | Oil separator and air conditioner with oil separator | |
| CN106440273A (en) | Air conditioner system and control method thereof | |
| CN105318491A (en) | Air conditioner control method and device | |
| CN108800437A (en) | Air conditioner inhibits frosting control method | |
| CN105805825A (en) | Air conditioner and control method thereof | |
| CN106766431A (en) | Oil system and air handling system | |
| CN114165845A (en) | Multi-split air conditioner | |
| CN103890506A (en) | Air conditioner and method of operating same | |
| KR101509574B1 (en) | Multi-type air-conditioner and the control method | |
| EP3222943A1 (en) | System and method to maintain evaporator superheat during pumped refrigerant economizer operation | |
| KR20100064835A (en) | Air conditioner | |
| KR20150009275A (en) | Heat pump multi air conditioner and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |