CN105091228B - Cryogenic refrigeration control method, the device and system of air conditioner unit - Google Patents

Abstract

The invention discloses a kind of cryogenic refrigeration control method, the device and system of air conditioner unit.Wherein, this method includes：When the unit start of air conditioner enters the running status of cryogenic refrigeration, the open and-shut mode of the pressure at expulsion switch of unit is detected；If pressure at expulsion switch is the state of closure, the wind-speed gear of the outdoor fan of unit is reduced according to the first preset rules, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear.The present invention, which solves air conditioner unit in the prior art, under the running status of cryogenic refrigeration, to be caused unit band liquid occur because the pressure at expulsion of unit is relatively low and runs, cause the low technical problem of the operational reliability of unit.

Description

Cryogenic refrigeration control method, the device and system of air conditioner unit

Technical field

The present invention relates to air-conditioning technical field, in particular to a kind of cryogenic refrigeration control method of air conditioner unit, Device and system.

Background technology

At present, low-temperature refrigeration technology has been widely used in the places such as chafing dish restaurant, dining room, computer room, and to the need of cryogenic refrigeration The temperature ask increasing, to be realized is also more and more lower.In the prior art, we realize that the method for cryogenic refrigeration mainly has：

1st, rotating speed switching is carried out at different ambient temperatures using direct current generator.The method cost is high, general direct current generator 300%-400% more expensive than alternating current generator or so, therefore for the exploitation for inexpensive unit, this scheme is inadvisable.

2nd, using chopping regulating speed alternating current generator.There is part of generating units to use chopping regulating speed alternating current generator in the prior art Scheme, but the subject matter of this scheme, which is noise problem after copped wave, to be solved.

Also, air conditioner unit is under outdoor worst cold case during cryogenic refrigeration, because outdoor heat exchange can cause by force air conditioner The pressure at expulsion of unit is relatively low, and unit band liquid easily occurs and run, and causes the operational reliability of unit to reduce.

For air conditioner unit in the prior art under the running status of cryogenic refrigeration, because the pressure at expulsion of unit is relatively low Cause unit band liquid occur to run, cause the low technical problem of the operational reliability of unit, not yet propose effective solve at present Scheme.

The content of the invention

The embodiments of the invention provide a kind of cryogenic refrigeration control method, the device and system of air conditioner unit, with least Solve air conditioner unit in the prior art under the running status of cryogenic refrigeration, causes unit because the pressure at expulsion of unit is relatively low There is band liquid to run, cause the low technical problem of the operational reliability of unit.

One side according to embodiments of the present invention, there is provided a kind of cryogenic refrigeration control method of air conditioner unit, bag Include：When the unit start of air conditioner enters the running status of cryogenic refrigeration, the opening and closing shape of the pressure at expulsion switch of unit is detected State；If pressure at expulsion switch is the state of closure, the wind speed shelves of the outdoor fan of unit are reduced according to the first preset rules Position, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear.

Another aspect according to embodiments of the present invention, a kind of low-temperature refrigeration control device of air conditioner unit is additionally provided, Including：Detection unit, for when the unit start of air conditioner enters the running status of cryogenic refrigeration, detecting the exhaust pressure of unit The open and-shut mode of power switch；Control unit, in the case of state of the pressure at expulsion switch for closure, being preset according to first Rule reduces the wind-speed gear of the outdoor fan of unit, until pressure at expulsion switches off or wind-speed gear is reduced to deep low gear Position.

Another aspect according to embodiments of the present invention, a kind of cryogenic refrigeration control system of air conditioner unit is additionally provided, Including：The unit of air conditioner, including outdoor fan and outdoor heat exchanger；Pressure detection circuit, be connected with outdoor fan, for When unit start enters the running status of cryogenic refrigeration, the open and-shut mode of the pressure at expulsion switch of unit is detected；First adjustment electricity Road, be connected between pressure detection circuit and outdoor fan, for pressure at expulsion switch for closure state when, according to first Preset rules reduce unit outdoor fan wind-speed gear, until pressure at expulsion switch off or wind-speed gear be reduced to it is minimum Gear.

Using the embodiment of the present invention, when the unit of air conditioner is started shooting and enters the running status of cryogenic refrigeration, pass through inspection The open and-shut mode for surveying the pressure at expulsion switch of unit carries out gear adjustment to the wind-speed gear of the outdoor fan of unit, when unit During pressure at expulsion relatively low (such as situation of pressure at expulsion switch closure), unit pressure can be improved by reducing wind-speed gear, Until pressure is improved to switching off pressure at expulsion, or wind-speed gear is reduced to lowest gear, so that the pressure of unit is kept In rational scope, so as to meet the reliability requirement of cryogenic refrigeration, fortune of the unit in cryogenic refrigeration of air conditioner ensure that Reliability under row state.By the embodiment of the present invention, unit exhaust pressure when unit is run under cryogenic refrigeration operating mode is avoided Power too it is low cause unit band liquid operation the problem of, solve in the prior art air conditioner unit in the running status of cryogenic refrigeration Under, cause unit band liquid occur because the pressure at expulsion of unit is relatively low and run, the technology for causing the operational reliability of unit low is asked Topic, realize the effect for improving unit pressure at expulsion by reducing wind-speed gear when the pressure at expulsion of unit is relatively low, it is ensured that Reliability when unit is run under cryogenic refrigeration state.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the schematic diagram of the cryogenic refrigeration control system of air conditioner unit according to embodiments of the present invention；

Fig. 2 is that a kind of work of the cryogenic refrigeration control system of optional air conditioner unit according to embodiments of the present invention is former Manage schematic diagram；

Fig. 3 is the flow chart of the cryogenic refrigeration control method of air conditioner unit according to embodiments of the present invention；

Fig. 4 is a kind of flow of the cryogenic refrigeration control method of optional air conditioner unit according to embodiments of the present invention Figure；And

Fig. 5 is the schematic diagram of the low-temperature refrigeration control device of air conditioner unit according to embodiments of the present invention.

Embodiment

In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects Enclose.

It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product Or the intrinsic other steps of equipment or unit.

According to embodiments of the present invention, there is provided a kind of embodiment of the cryogenic refrigeration control system of air conditioner unit, Fig. 1 are The schematic diagram of the cryogenic refrigeration control system of air conditioner unit according to embodiments of the present invention.

As shown in figure 1, the system can include：The unit 11 of air conditioner, including outdoor fan 111, outdoor heat exchanger 113 And pressure at expulsion switch 115；Pressure detection circuit 12, it is connected with pressure at expulsion switch 115, it is low for entering in unit start During the running status of temperature refrigeration, the open and-shut mode of the pressure at expulsion switch of unit is detected；First adjustment circuit 13, is connected to pressure Detect between circuit 12 and outdoor fan 111, in state of the pressure at expulsion switch for closure, according to the first preset rules The wind-speed gear of the outdoor fan of unit is reduced, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear.

It should be further stated that in the above embodiment of the present invention, unit uses in the running status of cryogenic refrigeration Be alternating current generator.

Using the embodiment of the present invention, when the unit of air conditioner is started shooting and enters the running status of cryogenic refrigeration, pass through inspection The open and-shut mode for surveying the pressure at expulsion switch of unit carries out gear adjustment to the wind-speed gear of the outdoor fan of unit, when unit During pressure at expulsion relatively low (such as situation of pressure at expulsion switch closure), unit pressure can be improved by reducing wind-speed gear, Until pressure is improved to switching off pressure at expulsion, or wind-speed gear is reduced to lowest gear, so that the pressure of unit is kept In rational scope, so as to meet the reliability requirement of cryogenic refrigeration, fortune of the unit in cryogenic refrigeration of air conditioner ensure that Reliability under row state.By the embodiment of the present invention, unit exhaust pressure when unit is run under cryogenic refrigeration operating mode is avoided Power too it is low cause unit band liquid operation the problem of, solve in the prior art air conditioner unit in the running status of cryogenic refrigeration Under, cause unit band liquid occur because the pressure at expulsion of unit is relatively low and run, the technology for causing the operational reliability of unit low is asked Topic, realize the effect for improving unit pressure at expulsion by reducing wind-speed gear when the pressure at expulsion of unit is relatively low, it is ensured that Reliability when unit is run under cryogenic refrigeration state.

By the above embodiment of the present invention, because unit uses alternating current generator, thus solve and make in the prior art With direct current generator carry out cryogenic refrigeration cost it is high the problem of, and solve and entered in the prior art using chopping regulating speed alternating current generator The problem of noise is big during row cryogenic refrigeration.

According to the above embodiment of the present invention, above-mentioned system also includes：Less electromagnetic valve switch circuit and the second adjustment circuit.

Wherein, less electromagnetic valve switch circuit is connected with outdoor heat exchanger, pressure detection circuit and the first adjustment circuit respectively, For according to the first preset rules reduce outdoor fan wind-speed gear to lowest gear when, if pressure at expulsion switch still State in closure, then close the magnetic valve of outdoor heat exchanger；Second adjustment circuit is connected to pressure detection circuit and outdoor Between blower fan, in state of the pressure at expulsion switch for disconnection, the wind speed of outdoor fan to be heightened according to the second preset rules Gear, until pressure at expulsion switch closure or wind-speed gear are heightened to highest gear.

Alternatively, opened in wind-speed gear to the lowest gear but pressure at expulsion that outdoor fan is reduced according to the first preset rules Pass is when remaining in the state of closure, can be in fractional distilling tube by the magnetic valve for the outdoor heat exchanger for closing unit Closed mode, so as to reduce the outdoor heat exchange amount of unit, reach the purpose for improving unit pressure.

In an optional embodiment, if pressure at expulsion switch for disconnect state, the second adjustment circuit according to Second preset rules heighten the wind-speed gear of outdoor fan, to reduce the pressure at expulsion of unit, until pressure at expulsion switch closure Or wind-speed gear is heightened to highest gear, so that the pressure at expulsion of unit is unlikely to too high, so that the pressure at expulsion of unit It is maintained in suitable scope.

Still optionally further, when the wind-speed gear of outdoor fan heighten to make pressure at expulsion switch closure or outdoor fan Wind-speed gear heighten to highest gear, outdoor fan stable operation can be controlled (such as 1 hour or 2 small for a period of time When).For example, when the wind-speed gear of outdoor fan heighten to make pressure at expulsion switch closure when, outdoor fan can be controlled with low In current gear (even if wind-speed gear of pressure at expulsion switch closure) 1 grade wind-speed gear stable operation for a period of time；Work as room When the wind-speed gear of outer blower fan is heightened to highest gear, when can control outdoor fan with one section of the highest gear stable operation Between.

It should be further stated that due to consideration that outdoor operating mode in continuous change, therefore, per one section of stable operation Time will re-start to the wind-speed gear of outdoor fan and be sequentially adjusted in, to meet environmental demand at that time.

Alternatively, the suitable of the pressure at expulsion of unit may range from 2.4 to 3.0MPa in above-described embodiment.

The above embodiment of the present invention is discussed in detail with reference to Fig. 2.As shown in Fig. 2 the cryogenic refrigeration with air conditioner unit Control system includes unit (including outdoor fan, outdoor heat exchanger and pressure at expulsion switch), the pressure detecting electricity of air conditioner Road, temperature sensing circuit, outdoor fan windscreen adjustment circuit (including the first adjustment circuit in above-described embodiment and the second adjustment Circuit) and less electromagnetic valve switch circuit exemplified by, the above embodiment of the present invention is described in detail.

Specifically, when entering the running status of cryogenic refrigeration after the unit 11 of air conditioner is started shooting, opened according to pressure at expulsion Whether pass disconnects carries out wind-speed gear adjustment to outdoor fan.First, outdoor fan is transported with higher wind-speed gear after powering OK, then if pressure detection circuit detects pressure at expulsion switch closure, then outside outdoor fan windscreen adjustment circuit control room One grade of position that down downshifts of blower fan one grade, until pressure detection circuit detects that pressure at expulsion switches off；Switched in pressure at expulsion The wind-speed gear of outdoor fan windscreen adjustment circuit control outdoor fan heightens 2 grades after disconnection, and it is small to drop one grade of stable operation 1 afterwards When, carry out wind-speed gear adjustment further according to the open and-shut mode of pressure at expulsion switch；If pressure at expulsion is switched in outdoor fan Still in closure state when wind-speed gear has been reduced to lowest gear, now need to drop by changing the area of outdoor heat exchanger Low outdoor heat exchange amount, to improve the pressure of unit.At this point it is possible to opening by magnetic valve (can have 1 or several magnetic valves) Close to realize, be illustrated below as 1 magnetic valve：

If the wind-speed gear of outdoor fan pressure at expulsion switch in lowest gear still closes, now electromagnetic valve switch electricity Magnetic valve is closed in road control, and outdoor fan windscreen adjustment circuit control outdoor fan heightens 2 grades of wind-speed gears, further according to exhaust pressure The open and-shut mode of power switch carries out wind-speed gear adjustment to outdoor fan.In this process, if whenever the row of detecting Gas pressure switch disconnects then outdoor fan and heightens 2 grades of wind-speed gears, if the wind-speed gear of outdoor fan is arranged in highest gear Gas pressure switch now needs to open magnetic valve so that system pressure is in normal range (NR), due to considering still in off-state To outdoor operating mode in continuous change, therefore outdoor fan stable operation 1 hour or 2 hours will be to the wind of outdoor fan every time Fast gear is done again once to be adjusted, to meet prevailing circumstances demand.

Alternatively, in the above-described embodiments, the wind-speed gear that outdoor fan is run after powering can be according to air conditioner The outdoor environment temperature of unit determines that outdoor fan is run with higher wind-speed gear when outdoor environment temperature is higher, works as room Outdoor fan is run with relatively low wind-speed gear when external environment temperature is relatively low, can so avoid outdoor fan in outdoor environment temperature Run when spending relatively low with higher wind-speed gear, outdoor heat exchange causes by force pressure at expulsion relatively low, and unit band liquid occurs and run, and improves Operational reliability of the unit in cryogenic refrigeration；Outdoor fan can also be avoided when outdoor environment temperature is higher with relatively low Wind-speed gear runs and can not quickly realize the effect of cryogenic refrigeration, so as to improve the refrigerating efficiency of the unit of air conditioner.

In above-mentioned application scenarios, according to embodiments of the present invention, there is provided a kind of cryogenic refrigeration control of air conditioner unit The embodiment of the method for method, can be such as one group of computer can the flow of accompanying drawing illustrates the step of, it is necessary to explanation Performed in the computer system of execute instruction, although also, show logical order in flow charts, in some situations Under, can be with the step shown or described by being performed different from order herein.

Fig. 3 is the flow chart of the cryogenic refrigeration control method of air conditioner unit according to embodiments of the present invention, such as Fig. 3 institutes Show, this method may include steps of：

Step S302, when the unit start of air conditioner enters the running status of cryogenic refrigeration, detect the exhaust pressure of unit The open and-shut mode of power switch.

Alternatively, when the unit in air conditioner is started shooting and enters the running status of cryogenic refrigeration, by detecting pressure at expulsion The open and-shut mode of switch is adjusted to the wind-speed gear of outdoor fan, so that the pressure of unit is maintained at suitable scope It is interior.When detecting pressure at expulsion switch closure, illustrate that the pressure of unit is relatively low, the relatively low unit that may result in of unit pressure goes out Phenomenon now with liquid operation, this phenomenon can reduce the refrigerating efficiency of unit, can now be dropped by reducing wind-speed gear Low outdoor heat exchange amount, so as to improve the pressure of unit.

In the above embodiment of the present invention, when the unit start of air conditioner enters the running status of cryogenic refrigeration, detection Before the open and-shut mode of the pressure at expulsion switch of unit, the above method can also include：Detect the outdoor environment temperature residing for unit Degree；Outdoor fan wind-speed gear for running in start is determined according to outdoor environment temperature, wherein, outdoor environment temperature is higher, Corresponding wind-speed gear is higher.

Alternatively, when the unit start of air conditioner enters the running status of cryogenic refrigeration, the pressure at expulsion of unit is detected Before the open and-shut mode of switch, the outdoor environment temperature first according to residing for unit determines wind speed during outdoor fan start operation Gear, outdoor environment temperature is higher, then corresponding wind-speed gear is higher.

For example, when outdoor environment temperature is more than 22 degrees Celsius, it may be determined that outdoor fan is when unit is started shooting with highest Gear is run.

By the above embodiment of the present invention, outdoor fan can be avoided when outdoor environment temperature is relatively low with higher wind speed Gear is run, and outdoor heat exchange causes by force pressure at expulsion relatively low, and unit band liquid occurs and run, and exists so as to improve the unit of air conditioner Reliability during cryogenic refrigeration.

It should be further stated that in the above embodiment of the present invention, unit uses in the running status of cryogenic refrigeration Be alternating current generator.

By the above embodiment of the present invention, because unit uses alternating current generator, thus solve and make in the prior art With direct current generator carry out cryogenic refrigeration cost it is high the problem of, and solve and entered in the prior art using chopping regulating speed alternating current generator The problem of noise is big during row cryogenic refrigeration.

Step S304, if pressure at expulsion switch is the state of closure, the room of unit is reduced according to the first preset rules The wind-speed gear of outer blower fan, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear.

Specifically, detect pressure at expulsion switch for closure state when, i.e., can be according to when the pressure of unit is relatively low First preset rules reduce the wind-speed gear of the outdoor fan of unit, until boost in pressure is to sufficiently large and switch pressure at expulsion Disconnect.But because the gear of alternating current generator is limited, therefore when the wind-speed gear of outdoor fan is reduced to lowest gear, row Gas pressure switch may be still within the state of closure.

Alternatively, when reducing wind-speed gear to the lowest gear of outdoor fan according to the first preset rules, if exhaust Pressure switch remains in the state of closure, then closes the magnetic valve of the outdoor heat exchanger of unit.

Specifically, opened in wind-speed gear to the lowest gear but pressure at expulsion that outdoor fan is reduced according to the first preset rules Pass is when remaining in the state of closure, can be in fractional distilling tube by the magnetic valve for the outdoor heat exchanger for closing unit Closed mode, so as to reduce the outdoor heat exchange amount of unit, reach the purpose for improving unit pressure, to meet the reliable of cryogenic refrigeration Property require.

Using the embodiment of the present invention, when the unit of air conditioner is started shooting and enters the running status of cryogenic refrigeration, pass through inspection The open and-shut mode for surveying the pressure at expulsion switch of unit carries out gear adjustment to the wind-speed gear of the outdoor fan of unit, when unit During pressure at expulsion relatively low (such as situation of pressure at expulsion switch closure), unit pressure can be improved by reducing wind-speed gear, Until pressure is improved to switching off pressure at expulsion, or wind-speed gear is reduced to lowest gear, so that the pressure of unit is kept In rational scope, so as to meet the reliability requirement of cryogenic refrigeration, fortune of the unit in cryogenic refrigeration of air conditioner ensure that Reliability under row state.By the embodiment of the present invention, unit exhaust pressure when unit is run under cryogenic refrigeration operating mode is avoided Power too it is low cause unit band liquid operation the problem of, solve in the prior art air conditioner unit in the running status of cryogenic refrigeration Under, cause unit band liquid occur because the pressure at expulsion of unit is relatively low and run, the technology for causing the operational reliability of unit low is asked Topic, realize the effect for improving unit pressure at expulsion by reducing wind-speed gear when the pressure at expulsion of unit is relatively low, it is ensured that Reliability when unit is run under cryogenic refrigeration state.

According to the above embodiment of the present invention, step S304, according to the wind of the outdoor fan of the first preset rules reduction unit Fast gear, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear and can included：

Step S3041, controlling the wind-speed gear of outdoor fan reduces the first preset gear.Alternatively, the first preset gear It can be 1 grade.

Step S3043, postponing the open and-shut mode of the first preset time and then secondary detection pressure at expulsion switch.It is optional Ground, the first preset time can be 40 seconds.

Wherein, in state of the pressure at expulsion switch for disconnection, step S3045 is performed；It is closure in pressure at expulsion switch State when, perform step S3047.

Step S3045, the wind-speed gear of outdoor fan is heightened to predetermined gear according to the second preset rules.

Step S3047, whether the wind-speed gear for detecting outdoor fan is lowest gear.

Wherein, in the case where the wind-speed gear for detecting outdoor fan is not lowest gear, return and perform step S3041, until wind-speed gear is reduced to lowest gear.

When reducing wind-speed gear to the lowest gear of outdoor fan according to the first preset rules, if pressure at expulsion switchs The state of closure is remained in, then closes the magnetic valve of the outdoor heat exchanger of unit.

In an optional embodiment, to this hair so that the first preset gear is 1 grade, the first preset time is 40 seconds as an example Bright above-described embodiment illustrates.

For example, can control the wind-speed gear of outdoor fan reduces by 1 grade every time, until pressure at expulsion switches off or outdoor The wind-speed gear of blower fan minimizes gear.When controlling the wind-speed gear of outdoor fan to reduce, if detecting, pressure at expulsion is opened Shut-off is opened, then wind-speed gear is heightened into 2 grades, when wind-speed gear being reduced into 1 grade after 1 second and making one section of outdoor fan stable operation Between (such as 1 hour or 2 hours), further according to pressure at expulsion switch open and-shut mode carry out wind-speed gear adjustment.

Further, before the time of outdoor fan stable operation reaches preset time period, can be vented with periodic detection The open and-shut mode of pressure switch, if detecting, pressure at expulsion switches off, and the wind-speed gear of control outdoor fan heightens 2 grades, Until wind-speed gear is raised to highest gear or pressure at expulsion switch closure；In this case, closed in pressure at expulsion switch Close and then it is secondary delay 1 second after make wind-speed gear reduce by 1 grade, and with reduce by 1 grade after one section of wind-speed gear stable operation Time (e.g., 1 hour or 2 hours).

When controlling the wind-speed gear of outdoor fan to reduce, if detecting wind speed shelves of the pressure at expulsion switch in outdoor fan Potential drop as little as lowest gear when still in closure state, now need to change to reduce outdoor by changing the area of outdoor heat exchanger Heat, i.e., now need to realize the control to unit pressure by magnetic valve.

In the above embodiment of the present invention, before the magnetic valve of outdoor heat exchanger of unit is closed, the above method may be used also With including：The wind-speed gear of control outdoor fan heightens the second preset gear；After the second preset time is postponed, triggering is closed Magnetic valve.Alternatively, the second preset gear can be 2 grades；Second preset time can be 10 seconds.

In an optional embodiment, to this hair so that the second preset gear is 2 grades, the second preset time is 10 seconds as an example Bright above-described embodiment illustrates.

For example, when outdoor fan lowest gear run but pressure at expulsion switch still close when, pass through magnetic valve realize pair The control of unit pressure.Now, the wind-speed gear of outdoor fan is controlled to heighten 2 grades, and after 10 seconds, outdoor heat exchange is closed in triggering The magnetic valve of device, to reduce outdoor heat exchange amount, improve unit pressure.After this, further according to the opening and closing shape of pressure at expulsion switch State is further adjusted to the wind-speed gear of outdoor fan.

Further, after the magnetic valve of outdoor heat exchanger of unit is closed, the above method can also include：Postponing The open and-shut mode of 3rd preset time and then secondary detection pressure at expulsion switch；If pressure at expulsion switch is the state of disconnection, Then opens solenoid valve, and after the 4th preset time is postponed, controlling the wind-speed gear of outdoor fan reduces the 3rd preset gear； If pressure at expulsion switch is the state of closure, after the 5th preset time is postponed, the wind-speed gear of outdoor fan is controlled Reduce the 4th preset gear.Alternatively, the 3rd preset time can be 3 minutes；4th preset time can be 10 seconds；3rd is pre- If gear can be 1 grade；5th preset time can be 1 second；4th preset gear can be 1 grade.

It is 10 seconds by 3 minutes, the 4th preset time of the 3rd preset time, the 3rd pre- in an optional embodiment If gear is 1 grade, the 5th preset time is 1 second and the 4th preset gear be 1 grade exemplified by the above embodiment of the present invention carry out Explanation.

For example, after the magnetic valve of heat exchanger is closed, continued according to the open and-shut mode that pressure at expulsion switchs to outdoor wind The wind-speed gear of machine is adjusted：The open and-shut mode of pressure at expulsion switch is detected again after 3 minutes, if now pressure at expulsion Switch off, then opens solenoid valve and after 10 seconds 1 grade of control outdoor fan reduction.

Alternatively, after control outdoor fan reduces by 1 grade, continue to detect the open and-shut mode of pressure at expulsion switch, if inspection Measure pressure at expulsion to switch off, then control the wind-speed gear of outdoor fan to heighten 2 grades, until wind-speed gear is raised to highest Gear detects pressure at expulsion switch closure.It is raised in wind-speed gear to highest gear or detects that pressure at expulsion is opened Close after closing, the wind-speed gear of outdoor fan is heightened according to the second preset rules in above-described embodiment.

In this embodiment, when detecting the open and-shut mode of pressure at expulsion switch after postponing 3 minutes again, if now arranging Gas pressure switch closes, then the wind-speed gear of outdoor fan is reduced by 1 grade after 1 second, opened afterwards further according to pressure at expulsion The open and-shut mode of pass is adjusted to the wind-speed gear of outdoor fan.

According to the above embodiment of the present invention, after the 5th preset time is postponed, the wind-speed gear of outdoor fan is controlled to drop After low 4th preset gear, the above method can also include：Postponing the 6th preset time and then secondary detection pressure at expulsion The open and-shut mode of switch；If pressure at expulsion switch is the state of closure, returns and perform after the 5th preset time is postponed, Controlling the wind-speed gear of outdoor fan reduces the 4th preset gear, until wind-speed gear is reduced to lowest gear；If exhaust Pressure switch is the state disconnected, then controls the wind-speed gear of outdoor fan to heighten the 5th preset gear, until wind-speed gear quilt Heighten to highest gear or pressure at expulsion switch closure.

Alternatively, the 6th preset time can be 40 seconds, the 5th preset gear can be 2 grades.

The embodiment is illustrated so that the 6th preset time is 40 seconds, the 5th preset gear is 2 grades as an example below.

For example, the wind-speed gear of outdoor fan is controlled after the 5th preset time is postponed reduces the 4th preset gear (such as The wind-speed gear of outdoor fan was set to reduce by 1 grade after 1 second) after, by pressure at expulsion switch is detected after 40 seconds again Open and-shut mode, if now detecting pressure at expulsion switch closure, make again outdoor fan wind-speed gear reduce by 1 grade it is (straight Untill gear is minimized), if pressure at expulsion switch still closes when the wind-speed gear of outdoor fan is reduced to lowest gear, Then control outdoor fan in the lowest gear stable operation for a period of time (such as 1 hour or 2 hours).If detecting, pressure at expulsion is opened Shut-off is opened, then the wind-speed gear of outdoor fan is heightened 2 grades, until wind-speed gear, which is raised to highest gear, (now opens electricity Magnet valve, the wind-speed gear of outdoor fan is adjusted further according to the open and-shut mode of pressure at expulsion switch) or pressure at expulsion switch Closure (now control outdoor fan stable operation for a period of time, such as 1 hour or 2 hours, and according to row during stable operation The open and-shut mode of gas pressure switch is adjusted to the wind-speed gear of outdoor fan).

According to the above embodiment of the present invention, the above method can also include：Step S306, if pressure at expulsion switch is disconnected The state opened, then the wind-speed gear of outdoor fan is heightened according to the second preset rules, until pressure at expulsion switch closure or wind speed Gear is heightened to highest gear.Wherein, when heightening wind-speed gear to the highest gear of outdoor fan according to the second preset rules, If pressure at expulsion switchs the state for remaining in disconnection, control outdoor fan runs the first preset time under highest gear Section.

Specifically, detect pressure at expulsion switch for disconnect state when, i.e., can be according to when the pressure of unit is higher Second preset rules heighten the wind-speed gear of the outdoor fan of unit, until pressure is reduced to rational scope and makes pressure at expulsion Switch closure.But because the gear of alternating current generator is limited, therefore when the wind-speed gear of outdoor fan is heightened to highest gear When, pressure at expulsion switch may be still within the state disconnected.

Alternatively, when heightening wind-speed gear to the highest gear of outdoor fan according to the second preset rules, if exhaust Pressure switch remains in the state of disconnection, then controls outdoor fan to run the first preset time period under highest gear.

Specifically, opened in wind-speed gear to the highest gear but pressure at expulsion that outdoor fan is heightened according to the second preset rules When pass remains in the state of disconnection, the outdoor fan of unit is controlled to run the first preset time period under the highest gear.

Wherein, the first preset time period can be 1 hour or 2 hours, and specific time span can be according to the application of reality Scene and set, the present invention only make exemplary illustration herein.After reaching the first preset time period at runtime, again according to The open and-shut mode of pressure at expulsion switch is adjusted to the wind-speed gear of outdoor fan.

By the above embodiment of the present invention, when pressure at expulsion switches off, illustrate that the pressure of unit is higher, unit pressure The higher unit that may result in increases than work(, causes the reduction of unit cycle performance coefficient, equally influences the refrigerating efficiency of unit, this When need by heightening wind-speed gear to increase outdoor heat exchange amount, reduce the pressure of unit, can so avoid outdoor fan from existing So that relatively low wind-speed gear is run and can not quickly realize the effect of cryogenic refrigeration when outdoor environment temperature is higher.

According to the above embodiment of the present invention, the wind-speed gear of outdoor fan is heightened according to the second preset rules, until being vented Pressure switch is closed or wind-speed gear is heightened to highest gear and can included：It is pre- that the wind-speed gear of control outdoor fan heightens the 6th If gear；Postponing the open and-shut mode of the 7th preset time and then secondary detection pressure at expulsion switch；If pressure at expulsion switchs For the state of disconnection, then the wind-speed gear for returning to execution control outdoor fan heightens the 6th preset gear, until wind-speed gear quilt Heighten to highest gear；If pressure at expulsion switch is the state of closure, the wind-speed gear of outdoor fan, and control room are reduced Outer blower fan runs the second preset time period according to the wind-speed gear after reduction.

Alternatively, the 6th preset gear can be 2 grades, the 7th preset time can be 3 minutes, the second preset time period can Think 1 hour or 2 hours.

Below so that the 6th preset gear is 2 grades, the 7th preset time is 3 minutes, the second preset time period is 1 hour as an example The embodiment is illustrated.

For example, detect that pressure at expulsion switch is disconnected when the unit start of air conditioner enters the running status of cryogenic refrigeration During the state opened, the wind-speed gear of outdoor fan is set to heighten 2 grades, and detect opening for pressure at expulsion switch again after 3 minutes Closed state；If now pressure at expulsion switch is still the state disconnected, continue to make the wind-speed gear of outdoor fan to heighten 2 grades, directly It is raised untill highest gear to wind-speed gear and (now controls outdoor fan in highest gear stable operation 1 hour)；If Pressure at expulsion switch closure is detected during this, then reduces the wind-speed gear of outdoor fan and controls outdoor fan according to drop Wind-speed gear stable operation after low 1 hour.

Wherein, the second preset time period and then secondary opening according to pressure at expulsion switch are reached in the time of stable operation Closed state is adjusted to the wind-speed gear of outdoor fan.

In this embodiment, if pressure at expulsion switch is the state of closure, the wind-speed gear of outdoor fan is reduced, and control Outdoor fan processed runs the second preset time period according to the wind-speed gear after reduction to be included：It is closure in pressure at expulsion switch In the state of, after the 8th preset time is postponed, controlling the wind-speed gear of outdoor fan reduces the 7th preset gear, and again Detect the open and-shut mode of pressure at expulsion switch；If pressure at expulsion switch is the state disconnected, returns and perform control room exogenous wind The wind-speed gear of machine heightens the 6th preset gear；If pressure at expulsion switch is the state of closure, continue to judge pressure at expulsion Whether the closing time of switch is more than the second preset time period；If the closing time of pressure at expulsion switch is more than the second preset time Section, then the wind-speed gear of outdoor fan is reduced according to the first preset rules, until pressure at expulsion switches off or wind-speed gear is Lowest gear；If the closing time of pressure at expulsion switch returns not less than the second preset time period and performs detection exhaust again The open and-shut mode of pressure switch.

Alternatively, the 8th preset time can be 1 second, the 7th preset gear can be 1 grade.

The embodiment is illustrated so that the 8th preset time is 1 second, the 7th preset gear is 1 grade as an example below.

In the above-described embodiments, if detecting pressure at expulsion switch closure, the wind-speed gear of outdoor fan is made reduce simultaneously Control outdoor fan specifically, outdoor fan can be made after 1 second according to the wind-speed gear stable operation 1 hour after reduction Wind-speed gear reduces by 1 grade, and controls outdoor fan according to the wind-speed gear stable operation 1 hour after reduction.

Wherein, before the time of stable operation reaches the second preset time period, in the process of outdoor fan stable operation In, can be with the open and-shut mode of periodic detection pressure at expulsion switch, if detecting, pressure at expulsion switches off, and return performs control The wind-speed gear of outdoor fan heightens the 6th preset gear.After the time of stable operation reaches the second preset time period, weight The open and-shut mode that new root switchs according to pressure at expulsion adjusts the wind-speed gear of outdoor fan.

With reference to Fig. 4, a magnetic valve is equipped with the unit of air conditioner, and unit in start outdoor fan with centre Exemplified by the application scenarios of the wind-speed gear operation of gear, the following institute of a kind of alternative that the above embodiment of the present invention can provide Show.This method may include steps of：

Step S401, the unit start operation of air conditioner.

Specifically, unit enters the running status of cryogenic refrigeration after powering, and its outdoor fan is with intervening gears Wind-speed gear is run.

Step S402, the open and-shut mode of detection pressure at expulsion switch.

Specifically, step S402 implementation is consistent with the implementation of the step S302 in above-described embodiment, herein Repeat no more.

Wherein, in the case of pressure at expulsion switch closure, step S403 is performed；In the situation that pressure at expulsion switches off Under, perform step S415.

Step S403, reduce by 1 grade of wind speed.

Specifically, when pressure at expulsion is switched and closed, controlling the wind-speed gear of outdoor fan reduces the first preset gear (such as 1 grade in the step).

Step S404, after delay 40 seconds, the open and-shut mode of detection pressure at expulsion switch.

Specifically, the first preset time (40 seconds in such as step) and then secondary detection pressure at expulsion switch are being postponed Open and-shut mode.

Wherein, in the case of pressure at expulsion switch closure, step S405 is performed；In the situation that pressure at expulsion switches off Under, perform step S415.

Step S405, whether the wind-speed gear for detecting outdoor fan is deep low gear.

Wherein, in the case where the wind-speed gear of outdoor fan is not deep low gear, return and perform step S403；In outdoor wind In the case that the wind-speed gear of machine is deep low gear, step S406 is performed.

Step S406,2 grades of wind speed are heightened, and magnetic valve was closed after 10 seconds.

Specifically, before the magnetic valve of outdoor heat exchanger of unit is closed, the wind-speed gear of outdoor fan is controlled to heighten Second preset gear (2 grades in such as step), and after the second preset time (10 seconds in such as step) is postponed, touch Hair closes magnetic valve.

Step S407, after 3 minutes, the open and-shut mode of detection pressure at expulsion switch.

Specifically, the 3rd preset time (3 minutes in such as step) and then secondary detection pressure at expulsion switch are being postponed Open and-shut mode.

Wherein, in the case of pressure at expulsion switch closure, step S408 is performed；In the situation that pressure at expulsion switches off Under, perform step S414.

Step S408,1 grade of wind speed is reduced after 1 second.

Specifically, if pressure at expulsion switch is the state of closure, then postponing the 5th preset time (in such as step 1 second) after, control outdoor fan wind-speed gear reduce the 4th preset gear (1 grade in such as step).

Step S409, after 40 seconds, the open and-shut mode of detection pressure at expulsion switch.

Specifically, the 6th preset time (40 seconds in such as step) and then secondary detection pressure at expulsion switch are being postponed Open and-shut mode.

Wherein, in the case of pressure at expulsion switch closure, return and perform step S408；Switched off in pressure at expulsion In the case of, perform step S410.

Step S410, heighten 2 grades of wind speed.

Specifically, if pressure at expulsion switch is the state disconnected, the wind-speed gear of outdoor fan is controlled to heighten the 5th Preset gear (2 grades in such as step).

Step S411, after 3 minutes, the open and-shut mode of detection pressure at expulsion switch.

Wherein, in the case of pressure at expulsion switch closure, step S413 is performed；In the situation that pressure at expulsion switches off Under, perform step S412.

Step S412, whether the wind-speed gear for detecting outdoor fan is most high-grade.

Wherein, outdoor fan wind-speed gear in the case of most high-grade, to return and perform step S410；In outdoor wind The wind-speed gear of machine is in the case of most high-grade, performs step S414.

Step S413, judges whether the closing time of pressure at expulsion switch is more than 60 minutes.

Wherein, in the case where the closing time of pressure at expulsion switch is more than 60 minutes, step S408 is performed；In exhaust pressure In the case that the closing time of power switch is not more than 60 minutes, step S411 is performed.

Step S414, opens solenoid valve, and 1 grade of wind speed was reduced after 10 seconds.

Specifically, if pressure at expulsion switch is the state disconnected, opens solenoid valve, and postponing the 4th preset time After (10 seconds in such as step), controlling the wind-speed gear of outdoor fan reduces the 3rd preset gear (1 in such as step Shelves).

Step S415, heighten 2 grades of wind speed.

Specifically, the wind-speed gear of outdoor fan is controlled to heighten the 6th preset gear (2 grades in such as step).

Step S416, after 3 minutes, the open and-shut mode of detection pressure at expulsion switch.

Specifically, the 7th preset time (3 minutes in such as step) and then secondary detection pressure at expulsion switch are being postponed Open and-shut mode.

Wherein, in the case of pressure at expulsion switch closure, step S418 is performed；In the situation that pressure at expulsion switches off Under, perform step S417.

Step S417, whether the wind-speed gear for detecting outdoor fan is most high-grade.

Wherein, outdoor fan wind-speed gear in the case of most high-grade, to return and perform step S415；In outdoor wind The wind-speed gear of machine is in the case of most high-grade, performs step S421.

Step S418,1 grade of wind speed is reduced after 1 second.

Step S419, the open and-shut mode of detection pressure at expulsion switch.

Wherein, in the case of pressure at expulsion switch closure, step S420 is performed；In the situation that pressure at expulsion switches off Under, perform step S415.

Step S420, judges whether the closing time of pressure at expulsion switch is more than 60 minutes.

Specifically, if pressure at expulsion switch is the state of closure, wind-speed gear (e.g., the step of outdoor fan is being reduced S418 after), control outdoor fan runs (60 points in such as step of the second preset time period according to the wind-speed gear after reduction Clock).

Wherein, in the case where the closing time of pressure at expulsion switch is more than 60 minutes, step S403 is performed；In exhaust pressure In the case that the closing time of power switch is not more than 60 minutes, returns and perform step S419.

Step S421, control outdoor fan was in most high-grade operation 1 hour.

Specifically, when heightening wind-speed gear to the highest gear of outdoor fan according to the second preset rules, if exhaust Pressure switch remains in the state of disconnection, then controls outdoor fan to run the first preset time period under highest gear (as being somebody's turn to do 1 hour in step).

By the above embodiment of the present invention, solve air conditioner unit reliability of operation under cryogenic refrigeration state and ask Topic, air conditioner unit mainly include multi gear alternating current generator, pressure at expulsion switch, magnetic valve, outdoor heat exchanger etc..In the embodiment In, the wind-speed gear of outdoor fan when determining that unit enters cryogenic refrigeration running status according to outdoor environment temperature first； It is (logical by adjusting outdoor fan rotating speed (being realized by adjusting wind-speed gear) and outdoor heat exchanger area under cryogenic refrigeration state Cross opening and closing magnetic valve realization) change outdoor unit heat exchange amount so that the high pressure of whole system is in normal pressure model Under enclosing, prevent that unit pressure at expulsion is relatively low because outdoor heat exchange is big for unit, cause unit band liquid to run, improve unit low Reliability of operation under warm refrigerating state.

Fig. 5 is the schematic diagram of the low-temperature refrigeration control device of air conditioner unit according to embodiments of the present invention.As illustrated, The device can include：First detection unit 51 and the first control unit 53.

Wherein, the first detection unit 51 is used for when the unit start of air conditioner enters the running status of cryogenic refrigeration, inspection Survey the open and-shut mode of the pressure at expulsion switch of unit.

Alternatively, when the unit in air conditioner is started shooting and enters the running status of cryogenic refrigeration, by detecting pressure at expulsion The open and-shut mode of switch is adjusted to the wind-speed gear of outdoor fan, so that the pressure of unit is maintained at suitable scope It is interior.When detecting pressure at expulsion switch closure, illustrate that the pressure of unit is relatively low, the relatively low unit that may result in of unit pressure goes out Phenomenon now with liquid operation, this phenomenon can reduce the refrigerating efficiency of unit, can now be dropped by reducing wind-speed gear Low outdoor heat exchange amount, so as to improve the pressure of unit.

In the above embodiment of the present invention, said apparatus can also include：3rd detection unit, for the machine in air conditioner When group start enters the running status of cryogenic refrigeration, before the on off state of pressure at expulsion switch for detecting unit, unit is detected Residing outdoor environment temperature；Determining unit, for determining outdoor fan wind for running in start according to outdoor environment temperature Fast gear, wherein, outdoor environment temperature is higher, and corresponding wind-speed gear is higher.

Alternatively, when the unit start of air conditioner enters the running status of cryogenic refrigeration, the pressure at expulsion of unit is detected Before the open and-shut mode of switch, the outdoor environment temperature first according to residing for unit determines wind speed during outdoor fan start operation Gear, outdoor environment temperature is higher, then corresponding wind-speed gear is higher.

For example, when outdoor environment temperature is more than 22 degrees Celsius, it may be determined that outdoor fan is when unit is started shooting with highest Gear is run.

By the above embodiment of the present invention, outdoor fan can be avoided when outdoor environment temperature is relatively low with higher wind speed Gear is run, and outdoor heat exchange causes by force pressure at expulsion relatively low, and unit band liquid occurs and run, and exists so as to improve the unit of air conditioner Reliability during cryogenic refrigeration.

It should be further stated that in the above embodiment of the present invention, unit uses in the running status of cryogenic refrigeration Be alternating current generator.

By the above embodiment of the present invention, because unit uses alternating current generator, thus solve and make in the prior art With direct current generator carry out cryogenic refrigeration cost it is high the problem of, and solve and entered in the prior art using chopping regulating speed alternating current generator The problem of noise is big during row cryogenic refrigeration.

First control unit 53 is used in the case of state of the pressure at expulsion switch for closure, according to the first preset rules The wind-speed gear of the outdoor fan of unit is reduced, until pressure at expulsion switches off or wind-speed gear is reduced to lowest gear.

Specifically, detect pressure at expulsion switch for closure state when, i.e., can be according to when the pressure of unit is relatively low First preset rules reduce the wind-speed gear of the outdoor fan of unit, until boost in pressure is to sufficiently large and switch pressure at expulsion Disconnect.But because the gear of alternating current generator is limited, therefore when the wind-speed gear of outdoor fan is reduced to lowest gear, row Gas pressure switch may be still within the state of closure.

Alternatively, said apparatus can also include：First closing unit, for reducing outdoor according to the first preset rules During the wind-speed gear of blower fan to lowest gear, in the case where pressure at expulsion switch remains in the state of closure, unit is closed Outdoor heat exchanger magnetic valve.

Specifically, opened in wind-speed gear to the lowest gear but pressure at expulsion that outdoor fan is reduced according to the first preset rules Pass is when remaining in the state of closure, can be in fractional distilling tube by the magnetic valve for the outdoor heat exchanger for closing unit Closed mode, so as to reduce the outdoor heat exchange amount of unit, reach the purpose for improving unit pressure, to meet the reliable of cryogenic refrigeration Property require.

Using the embodiment of the present invention, when the unit of air conditioner is started shooting and enters the running status of cryogenic refrigeration, pass through inspection The open and-shut mode for surveying the pressure at expulsion switch of unit carries out gear adjustment to the wind-speed gear of the outdoor fan of unit, when unit During pressure at expulsion relatively low (such as situation of pressure at expulsion switch closure), unit pressure can be improved by reducing wind-speed gear, Until pressure is improved to switching off pressure at expulsion, or wind-speed gear is reduced to lowest gear, so that the pressure of unit is kept In rational scope, so as to meet the reliability requirement of cryogenic refrigeration, fortune of the unit in cryogenic refrigeration of air conditioner ensure that Reliability under row state.By the embodiment of the present invention, unit exhaust pressure when unit is run under cryogenic refrigeration operating mode is avoided Power too it is low cause unit band liquid operation the problem of, solve in the prior art air conditioner unit in the running status of cryogenic refrigeration Under, cause unit band liquid occur because the pressure at expulsion of unit is relatively low and run, the technology for causing the operational reliability of unit low is asked Topic, realize the effect for improving unit pressure at expulsion by reducing wind-speed gear when the pressure at expulsion of unit is relatively low, it is ensured that Reliability when unit is run under cryogenic refrigeration state.

According to the above embodiment of the present invention, the first control unit can include：First control module, first detection module, Heighten module, the second detection module and the second control module.

Wherein, the first control module, for controlling the wind-speed gear of outdoor fan to reduce the first preset gear.Alternatively, First preset gear can be 1 grade.

First detection module, for postponing the opening and closing shape of the first preset time and then secondary detection pressure at expulsion switch State.Alternatively, the first preset time can be 40 seconds.

Module is heightened, in the case of state of the pressure at expulsion switch for disconnection, being heightened according to the second preset rules The wind-speed gear of outdoor fan is to predetermined gear.

Second detection module, in the case of state of the pressure at expulsion switch for closure, detecting the wind of outdoor fan Whether fast gear is lowest gear.

Second control module, in the case of being not lowest gear in the wind-speed gear for detecting outdoor fan, return Performing the wind-speed gear of control outdoor fan reduces the first preset gear, until wind-speed gear is reduced to lowest gear.

Wherein, in the case where the wind-speed gear for detecting outdoor fan is not lowest gear, return and perform step S3041, until wind-speed gear is reduced to lowest gear.

When reducing wind-speed gear to the lowest gear of outdoor fan according to the first preset rules, if pressure at expulsion switchs The state of closure is remained in, then closes the magnetic valve of the outdoor heat exchanger of unit.

In an optional embodiment, to this hair so that the first preset gear is 1 grade, the first preset time is 40 seconds as an example Bright above-described embodiment illustrates.

For example, can control the wind-speed gear of outdoor fan reduces by 1 grade every time, until pressure at expulsion switches off or outdoor The wind-speed gear of blower fan minimizes gear.When controlling the wind-speed gear of outdoor fan to reduce, if detecting, pressure at expulsion is opened Shut-off is opened, then wind-speed gear is heightened into 2 grades, when wind-speed gear being reduced into 1 grade after 1 second and making one section of outdoor fan stable operation Between (such as 1 hour or 2 hours), further according to pressure at expulsion switch open and-shut mode carry out wind-speed gear adjustment.

Further, before the time of outdoor fan stable operation reaches preset time period, can be vented with periodic detection The open and-shut mode of pressure switch, if detecting, pressure at expulsion switches off, and the wind-speed gear of control outdoor fan heightens 2 grades, Until wind-speed gear is raised to highest gear or pressure at expulsion switch closure；In this case, closed in pressure at expulsion switch Close and then it is secondary delay 1 second after make wind-speed gear reduce by 1 grade, and with reduce by 1 grade after one section of wind-speed gear stable operation Time (e.g., 1 hour or 2 hours).

When controlling the wind-speed gear of outdoor fan to reduce, if detecting wind speed shelves of the pressure at expulsion switch in outdoor fan Potential drop as little as lowest gear when still in closure state, now need to change to reduce outdoor by changing the area of outdoor heat exchanger Heat, i.e., now need to realize the control to unit pressure by magnetic valve.

In the above embodiment of the present invention, said apparatus can also include：4th control unit, for closing unit Before the magnetic valve of outdoor heat exchanger, the wind-speed gear of outdoor fan is controlled to heighten the second preset gear；Second closing unit, use In after the second preset time is postponed, magnetic valve is closed in triggering.Alternatively, the second preset gear can be 2 grades；Second is default Time can be 10 seconds.

In an optional embodiment, to this hair so that the second preset gear is 2 grades, the second preset time is 10 seconds as an example Bright above-described embodiment illustrates.

For example, when outdoor fan lowest gear run but pressure at expulsion switch still close when, pass through magnetic valve realize pair The control of unit pressure.Now, the wind-speed gear of outdoor fan is controlled to heighten 2 grades, and after 10 seconds, outdoor heat exchange is closed in triggering The magnetic valve of device, to reduce outdoor heat exchange amount, improve unit pressure.After this, further according to the switch shape of pressure at expulsion switch State is further adjusted to the wind-speed gear of outdoor fan.

Further, said apparatus can also include：Second detection unit, for closing the outdoor heat exchanger of unit After magnetic valve, postponing the on off state of the 3rd preset time and then secondary detection pressure at expulsion switch；4th control is single Member, for pressure at expulsion switch for disconnect state in the case of, opens solenoid valve, and postpone the 4th preset time it Afterwards, controlling the wind-speed gear of outdoor fan reduces the 3rd preset gear；5th control unit, for being closed in pressure at expulsion switch In the case of the state of conjunction, after the 5th preset time is postponed, controlling the wind-speed gear of outdoor fan reduces the 4th default shelves Position.

It is 10 seconds by 3 minutes, the 4th preset time of the 3rd preset time, the 3rd pre- in an optional embodiment If gear is 1 grade, the 5th preset time is 1 second and the 4th preset gear be 1 grade exemplified by the above embodiment of the present invention carry out Explanation.

For example, after the magnetic valve of heat exchanger is closed, continued according to the on off state that pressure at expulsion switchs to outdoor wind The wind-speed gear of machine is adjusted：The on off state of pressure at expulsion switch is detected again after 3 minutes, if now pressure at expulsion Switch off, then opens solenoid valve and after 10 seconds 1 grade of control outdoor fan reduction.

Alternatively, after control outdoor fan reduces by 1 grade, continue to detect the on off state of pressure at expulsion switch, if inspection Measure pressure at expulsion to switch off, then control the wind-speed gear of outdoor fan to improve 2 grades, until wind-speed gear is increased to highest Gear detects pressure at expulsion switch closure.Highest gear is increased in wind-speed gear or detects that pressure at expulsion is opened Close after closing, the wind-speed gear of outdoor fan is heightened according to the second preset rules in above-described embodiment.

In this embodiment, when detecting the on off state of pressure at expulsion switch after postponing 3 minutes again, if now arranging Gas pressure switch closes, then the wind-speed gear of outdoor fan is reduced by 1 grade after 1 second, opened afterwards further according to pressure at expulsion The on off state of pass is adjusted to the wind-speed gear of outdoor fan.

According to the above embodiment of the present invention, said apparatus can also include：3rd detection unit, for pre- in delay the 5th If after the time, after controlling the wind-speed gear of outdoor fan to reduce the 4th preset gear, after the 6th preset time is postponed, The on off state of pressure at expulsion switch is detected again；6th control unit, for being the state of closure in pressure at expulsion switch In the case of, return and perform after the 5th preset time is postponed, controlling the wind-speed gear of outdoor fan reduces the 4th preset gear, Until wind-speed gear is reduced to lowest gear；7th control unit, for being the feelings of the state disconnected in pressure at expulsion switch Under condition, the wind-speed gear of outdoor fan is controlled to improve the 5th preset gear, until wind-speed gear is increased to highest gear or row Gas pressure switch closes.

Alternatively, the 6th preset time can be 40 seconds, the 5th preset gear can be 2 grades.

The embodiment is illustrated so that the 6th preset time is 40 seconds, the 5th preset gear is 2 grades as an example below.

For example, the wind-speed gear of outdoor fan is controlled after the 5th preset time is postponed reduces the 4th preset gear (such as The wind-speed gear of outdoor fan was set to reduce by 1 grade after 1 second) after, by pressure at expulsion switch is detected after 40 seconds again On off state, if now detecting pressure at expulsion switch closure, make again outdoor fan wind-speed gear reduce by 1 grade it is (straight Untill gear is minimized), if pressure at expulsion switch still closes when the wind-speed gear of outdoor fan is reduced to lowest gear, Then control outdoor fan in the lowest gear stable operation for a period of time (such as 1 hour or 2 hours).If detecting, pressure at expulsion is opened Shut-off is opened, then the wind-speed gear of outdoor fan is improved 2 grades, until wind-speed gear is increased to highest gear and (now opens electricity Magnet valve, the wind-speed gear of outdoor fan is adjusted further according to the on off state of pressure at expulsion switch) or pressure at expulsion switch Closure (now control outdoor fan stable operation for a period of time, such as 1 hour or 2 hours, and according to row during stable operation The on off state of gas pressure switch is adjusted to the wind-speed gear of outdoor fan).

According to the above embodiment of the present invention, said apparatus can also include：Second control unit 55, in pressure at expulsion In the case of switching the state for disconnection, the wind-speed gear of outdoor fan is heightened according to the second preset rules, until pressure at expulsion Switch closure or wind-speed gear are heightened to highest gear.

Wherein, said apparatus can also include：3rd control unit, for heightening outdoor wind according to the second preset rules During the wind-speed gear of machine to highest gear, in the case where pressure at expulsion switch remains in the state of disconnection, control room exogenous wind Machine runs the first preset time period under highest gear.

Specifically, detect pressure at expulsion switch for disconnect state when, i.e., can be according to when the pressure of unit is higher Second preset rules heighten the wind-speed gear of the outdoor fan of unit, until pressure is reduced to rational scope and makes pressure at expulsion Switch closure.But because the gear of alternating current generator is limited, therefore when the wind-speed gear of outdoor fan is heightened to highest gear When, pressure at expulsion switch may be still within the state disconnected.

Alternatively, when heightening wind-speed gear to the highest gear of outdoor fan according to the second preset rules, if exhaust Pressure switch remains in the state of disconnection, then controls outdoor fan to run the first preset time period under highest gear.

Specifically, opened in wind-speed gear to the highest gear but pressure at expulsion that outdoor fan is heightened according to the second preset rules When pass remains in the state of disconnection, the outdoor fan of unit is controlled to run the first preset time period under the highest gear.

Wherein, the first preset time period can be 1 hour or 2 hours, and specific time span can be according to the application of reality Scene and set, the present invention only make exemplary illustration herein.After reaching the first preset time period at runtime, again according to The open and-shut mode of pressure at expulsion switch is adjusted to the wind-speed gear of outdoor fan.

By the above embodiment of the present invention, when pressure at expulsion switches off, illustrate that the pressure of unit is higher, unit pressure The higher unit that may result in increases than work(, causes the reduction of unit cycle performance coefficient, equally influences the refrigerating efficiency of unit, this When need by heightening wind-speed gear to increase outdoor heat exchange amount, reduce the pressure of unit, can so avoid outdoor fan from existing So that relatively low wind-speed gear is run and can not quickly realize the effect of cryogenic refrigeration when outdoor environment temperature is higher.

According to the above embodiment of the present invention, the second control unit can include：3rd control module, for control room exogenous wind The wind-speed gear of machine heightens the 6th preset gear；3rd detection module, for postponing the 7th preset time and then secondary detection The on off state of pressure at expulsion switch；4th control module, in the case of state of the pressure at expulsion switch for disconnection, returning The wind-speed gear of receipt row control outdoor fan heightens the 6th preset gear, until wind-speed gear is raised to lowest gear；The Five control modules, in the case of state of the pressure at expulsion switch for closure, reducing the wind-speed gear of outdoor fan, and control Outdoor fan processed runs the second preset time period according to the wind-speed gear after reduction.

Alternatively, the 6th preset gear can be 2 grades, the 7th preset time can be 3 minutes, the second preset time period can Think 1 hour or 2 hours.

Below so that the 6th preset gear is 2 grades, the 7th preset time is 3 minutes, the second preset time period is 1 hour as an example The embodiment is illustrated.

For example, detect that pressure at expulsion switch is disconnected when the unit start of air conditioner enters the running status of cryogenic refrigeration During the state opened, the wind-speed gear of outdoor fan is set to heighten 2 grades, and detect opening for pressure at expulsion switch again after 3 minutes Off status；If now pressure at expulsion switch is still the state disconnected, continue to make the wind-speed gear of outdoor fan to heighten 2 grades, directly It is raised untill highest gear to wind-speed gear and (now controls outdoor fan in highest gear stable operation 1 hour)；If Pressure at expulsion switch closure is detected during this, then reduces the wind-speed gear of outdoor fan and controls outdoor fan according to drop Wind-speed gear stable operation after low 1 hour.

Wherein, the second preset time period and then secondary opening according to pressure at expulsion switch are reached in the time of stable operation Off status is adjusted to the wind-speed gear of outdoor fan.

In this embodiment, the 5th control module can include：First control submodule, for being in pressure at expulsion switch In the state of closure, after the 8th preset time is postponed, controlling the wind-speed gear of outdoor fan reduces the 7th preset gear, and The on off state of pressure at expulsion switch is detected again；Second control submodule, for the state in pressure at expulsion switch for disconnection In the case of, the wind-speed gear for returning to execution control outdoor fan heightens the 6th preset gear；Judging submodule, for being vented In the case of state of the pressure switch for closure, when continuing to judge whether the closing time that pressure at expulsion switchs is default more than second Between section；3rd control submodule, for the closing time that is switched in pressure at expulsion more than the second preset time period in the case of, press The wind-speed gear of outdoor fan is reduced according to the first preset rules, until pressure at expulsion switches off or wind-speed gear is deep low gear Position；Detection sub-module, for the closing time that is switched in pressure at expulsion not less than the second preset time period in the case of, then return Perform the on off state for detecting pressure at expulsion switch again.

Alternatively, the 8th preset time can be 1 second, the 7th preset gear can be 1 grade.

The embodiment is illustrated so that the 8th preset time is 1 second, the 7th preset gear is 1 grade as an example below.

In the above-described embodiments, if detecting pressure at expulsion switch closure, the wind-speed gear of outdoor fan is made reduce simultaneously Control outdoor fan specifically, outdoor fan can be made after 1 second according to the wind-speed gear stable operation 1 hour after reduction Wind-speed gear reduces by 1 grade, and controls outdoor fan according to the wind-speed gear stable operation 1 hour after reduction.

Wherein, before the time of stable operation reaches the second preset time period, in the process of outdoor fan stable operation In, can be with the on off state of periodic detection pressure at expulsion switch, if detecting, pressure at expulsion switches off, and return performs control The wind-speed gear of outdoor fan heightens the 6th preset gear.After the time of stable operation reaches the second preset time period, weight The on off state that new root switchs according to pressure at expulsion adjusts the wind-speed gear of outdoor fan.

The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.

In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment The part of detailed description, it may refer to the associated description of other embodiment.

In several embodiments provided herein, it should be understood that disclosed technology contents, others can be passed through Mode is realized.Wherein, device embodiment described above is only schematical, such as the division of the unit, Ke Yiwei A kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module Connect, can be electrical or other forms.

The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On unit.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.

If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially The part to be contributed in other words to prior art or all or part of the technical scheme can be in the form of software products Embody, the computer software product is stored in a storage medium, including some instructions are causing a computer Equipment (can be personal computer, server or network equipment etc.) perform each embodiment methods described of the present invention whole or Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes Medium.

Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (12)

1. A kind of 1. cryogenic refrigeration control method of air conditioner unit, it is characterised in that including：

   Air conditioner unit start into cryogenic refrigeration running status when, detect the unit pressure at expulsion switch open Closed state；

   If the pressure at expulsion switch is the state of closure, the outdoor fan of the unit is reduced according to the first preset rules Wind-speed gear, until the pressure at expulsion switches off or the wind-speed gear is reduced to lowest gear；

   When reducing the wind-speed gear to the lowest gear of the outdoor fan according to first preset rules, if The pressure at expulsion switch remains in the state of the closure, then closes the magnetic valve of the outdoor heat exchanger of the unit.
2. 2. according to the method for claim 1, it is characterised in that the outdoor wind of the unit is reduced according to the first preset rules The wind-speed gear of machine, until the pressure at expulsion switches off or the wind-speed gear is reduced to lowest gear and included：

   Controlling the wind-speed gear of the outdoor fan reduces the first preset gear；

   Postponing the open and-shut mode of the first preset time and then the secondary detection pressure at expulsion switch；

   If the pressure at expulsion switch is the state disconnected, heightened according to the second preset rules described in the outdoor fan Wind-speed gear is to predetermined gear；

   If state of the pressure at expulsion switch for the closure, detect the outdoor fan the wind-speed gear whether For the lowest gear；

   In the case where the wind-speed gear for detecting the outdoor fan is not the lowest gear, returns and perform control institute Stating the wind-speed gear of outdoor fan reduces by first preset gear, until the wind-speed gear be reduced to it is described minimum Gear.
3. 3. according to the method for claim 2, it is characterised in that

   Before the magnetic valve of outdoor heat exchanger of the unit is closed, methods described also includes：

   The wind-speed gear of the outdoor fan is controlled to heighten the second preset gear；

   After the second preset time is postponed, the magnetic valve is closed in triggering；

   After the magnetic valve of outdoor heat exchanger of the unit is closed, methods described also includes：

   Postponing the open and-shut mode of the 3rd preset time and then the secondary detection pressure at expulsion switch；

   If state of the pressure at expulsion switch for the disconnection, the magnetic valve is opened, and when delay the 4th is default Between after, control the outdoor fan the wind-speed gear reduce the 3rd preset gear；

   If the pressure at expulsion switch is the state of the closure, after the 5th preset time is postponed, the room is controlled The wind-speed gear of outer blower fan reduces the 4th preset gear.
4. 4. according to the method for claim 3, it is characterised in that after the 5th preset time is postponed, control the outdoor After the wind-speed gear of blower fan reduces the 4th preset gear, methods described also includes：

   Postponing the open and-shut mode of the 6th preset time and then the secondary detection pressure at expulsion switch；

   If state of the pressure at expulsion switch for the closure, return perform postpone the 5th preset time it Afterwards, controlling the wind-speed gear of the outdoor fan reduces the 4th preset gear, until the wind-speed gear is lowered To the lowest gear；

   If the pressure at expulsion switch is the state of the disconnection, the wind-speed gear of the outdoor fan is controlled to heighten 5th preset gear, until the wind-speed gear is raised to highest gear or pressure at expulsion switch closure.
5. 5. according to the method for claim 1, it is characterised in that if pressure at expulsion switch is the state of disconnection, The wind-speed gear of the outdoor fan is heightened according to the second preset rules, until pressure at expulsion switch closure or described Wind-speed gear is heightened to highest gear, wherein, the wind speed of the outdoor fan is being heightened according to second preset rules During gear to the highest gear, if pressure at expulsion switch remains in the state of the disconnection, the room is controlled Outer blower fan runs the first preset time period under the highest gear.
6. 6. according to the method for claim 5, it is characterised in that the institute of the outdoor fan is heightened according to the second preset rules Wind-speed gear is stated, is included until pressure at expulsion switch closure or the wind-speed gear are heightened to highest gear：

   The wind-speed gear of the outdoor fan is controlled to heighten the 6th preset gear；

   Postponing the open and-shut mode of the 7th preset time and then the secondary detection pressure at expulsion switch；

   If the pressure at expulsion switch is the state of the disconnection, the wind speed for performing and controlling the outdoor fan is returned Gear heightens the 6th preset gear, until the wind-speed gear is raised to the highest gear；

   If the pressure at expulsion switch is the state of the closure, the wind-speed gear of the outdoor fan is reduced, and The outdoor fan is controlled to run the second preset time period according to the wind-speed gear after reduction.
7. 7. according to the method for claim 6, it is characterised in that if pressure at expulsion switch is the shape of the closure State, reduces the wind-speed gear of the outdoor fan, and controls the outdoor fan to be run according to the wind-speed gear after reduction Second preset time period includes：

   In the state of pressure at expulsion switch is the closure, after the 8th preset time is postponed, the outdoor is controlled The wind-speed gear of blower fan reduces the 7th preset gear, and detects the open and-shut mode of the pressure at expulsion switch again；

   If the pressure at expulsion switch is the state of the disconnection, the wind speed for performing and controlling the outdoor fan is returned Gear heightens the 6th preset gear；

   If the pressure at expulsion switch is the state of the closure, continue to judge the closing time of the pressure at expulsion switch Whether second preset time period is exceeded；

   If the closing time of the pressure at expulsion switch exceedes second preset time period, according to first preset rules The wind-speed gear of the outdoor fan is reduced, until the pressure at expulsion switches off or the wind-speed gear is reduced to institute State lowest gear；

   If the closing time of the pressure at expulsion switch returns to perform and detects institute again not less than second preset time period State the open and-shut mode of pressure at expulsion switch.
8. 8. method as claimed in any of claims 1 to 7, it is characterised in that start shooting and enter in the unit of air conditioner During the running status of cryogenic refrigeration, before the open and-shut mode of pressure at expulsion switch for detecting the unit, methods described also includes：

   Detect the outdoor environment temperature residing for the unit；

   Outdoor fan wind-speed gear for running in start is determined according to the outdoor environment temperature, wherein,

   The outdoor environment temperature is higher, and the corresponding wind-speed gear is higher.
9. A kind of 9. low-temperature refrigeration control device of air conditioner unit, it is characterised in that including：

   First detection unit, for when the unit start of air conditioner enters the running status of cryogenic refrigeration, detecting the unit Pressure at expulsion switch open and-shut mode；

   First control unit, in the case of being the state of closure in pressure at expulsion switch, according to the first preset rules The wind-speed gear of the outdoor fan of the unit is reduced, until the pressure at expulsion switches off or the wind-speed gear is reduced to Lowest gear；

   Described device also includes：First closing unit, for reducing the outdoor fan according to first preset rules During the wind-speed gear to the lowest gear, the situation of the state of the closure is remained in pressure at expulsion switch Under, close the magnetic valve of the outdoor heat exchanger of the unit.
10. 10. device according to claim 9, it is characterised in that first control unit includes：

    First control module, for controlling the wind-speed gear of the outdoor fan to reduce the first preset gear；

    First detection module, for postponing the opening and closing shape of the first preset time and then the secondary detection pressure at expulsion switch State；

    Module is heightened, in the case of state of the pressure at expulsion switch for disconnection, being heightened according to the second preset rules The wind-speed gear of the outdoor fan is to predetermined gear；

    Second detection module, in the case of state of the pressure at expulsion switch for the closure, detecting the outdoor Whether the wind-speed gear of blower fan is the lowest gear；

    Second control module, for detecting that the wind-speed gear of the outdoor fan is not the situation of the lowest gear Under, return and perform wind-speed gear reduction by first preset gear for controlling the outdoor fan, until the wind speed shelves Position is reduced to the lowest gear.
11. A kind of 11. cryogenic refrigeration control system of air conditioner unit, it is characterised in that including：

    The unit of air conditioner, including outdoor fan, outdoor heat exchanger and pressure at expulsion switch；

    Pressure detection circuit, switch and connect with the pressure at expulsion, for the operation in unit start into cryogenic refrigeration During state, the open and-shut mode of the pressure at expulsion switch of the unit is detected；

    First adjustment circuit, it is connected between the pressure detection circuit and the outdoor fan, in the pressure at expulsion When switching the state for closure, the wind-speed gear of the outdoor fan of the unit is reduced according to the first preset rules, until described Pressure at expulsion switches off or the wind-speed gear is reduced to lowest gear；

    The system also includes：Less electromagnetic valve switch circuit, respectively with the outdoor heat exchanger, the pressure detection circuit and institute The connection of the first adjustment circuit is stated, for reducing the wind-speed gear of the outdoor fan extremely according to first preset rules During the lowest gear, if pressure at expulsion switch remains in the state of the closure, the outdoor heat exchange is closed The magnetic valve of device.
12. 12. system according to claim 11, it is characterised in that the system also includes：

    Second adjustment circuit, it is connected between the pressure detection circuit and the outdoor fan, in the pressure at expulsion When switching the state for disconnection, the wind-speed gear of the outdoor fan is heightened according to the second preset rules, until the row Gas pressure switch is closed or the wind-speed gear is heightened to highest gear.