CN108759211A - The second vapor injection control method of two stage centrifugal unit and two stage centrifugal unit - Google Patents
The second vapor injection control method of two stage centrifugal unit and two stage centrifugal unit Download PDFInfo
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- CN108759211A CN108759211A CN201810599708.1A CN201810599708A CN108759211A CN 108759211 A CN108759211 A CN 108759211A CN 201810599708 A CN201810599708 A CN 201810599708A CN 108759211 A CN108759211 A CN 108759211A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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Abstract
The invention discloses the second vapor injection control methods of a kind of two stage centrifugal unit and two stage centrifugal unit, wherein two stage centrifugal unit includes two stage centrifugal compressor, evaporator, condenser, economizer and aeration valve, and method includes the following steps：Obtain the two level suction superheat at two level air entry or the secondary exhaust degree of superheat at secondary exhaust；Judge whether two level suction superheat is less than default suction superheat lower limiting value or whether the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value；If two level suction superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value, carrying out aperture to aeration valve turns control down.This method can prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation while ensureing efficient tonifying Qi among compressor to greatest extent.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of second vapor injection control method and one of two stage centrifugal unit
Kind two stage centrifugal unit.
Background technology
The mode of two-shipper centrifugal compressor generally use two-stage throttling second vapor injection carries out system circulation, but if in
Between mend gas carrying liquid, be easily damaged impeller or occur causing to run the bad phenomenons such as oil because of seal leakage.
In the related technology, usually consider that aeration valve, which is adjusted to suitable aperture, to be run, and the shock resistance of unit itself is utilized
Characteristic operates.However, for frequency converter sets, since its operating condition, unit load change, lead to the fortune of unit itself
Row Parameters variation is complicated, and under some specific loads such as low frequency operating, the discharge superheat of unit itself is not just high, can be further
This risk is increased, the reliability of unit operation is unfavorable for.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose is to propose that a kind of second vapor injection control method of two stage centrifugal unit, this method can protect to greatest extent
While demonstrate,proving efficient tonifying Qi among compressor, prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation.
Second object of the present invention is to propose a kind of non-transitorycomputer readable storage medium.
Third object of the present invention is to propose a kind of two stage centrifugal unit.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of second vapor injection control of two stage centrifugal unit
Method processed, the two stage centrifugal unit include two stage centrifugal compressor, evaporator, condenser, economizer and aeration valve, described double
The level-one air entry of grade centrifugal compressor is connected with one end of the evaporator, the secondary exhaust of the two stage centrifugal compressor
It is connected with one end of the condenser, the warp is provided between the other end of the evaporator and the other end of the condenser
Help device, and the economizer also passes through the level-one exhaust outlet and two level air entry point of the aeration valve and the two stage centrifugal compressor
Not Xiang Lian, the described method comprises the following steps：Obtain the two level suction superheat at the two level air entry or the two level
The secondary exhaust degree of superheat of exhaust ports；Judge whether the two level suction superheat is less than default suction superheat lower limiting value,
Or whether the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value；If the two level suction superheat is less than
The default suction superheat lower limiting value or the secondary exhaust degree of superheat are less than the default discharge superheat lower limiting value,
Aperture then is carried out to the aeration valve and turns control down.
The second vapor injection control method of two stage centrifugal unit according to the ... of the embodiment of the present invention obtains two at two level air entry
The secondary exhaust degree of superheat at grade suction superheat or secondary exhaust, and it is pre- to judge whether two level suction superheat is less than
If whether suction superheat lower limiting value or the secondary exhaust degree of superheat are less than default discharge superheat lower limiting value, and are inhaled in two level
The gas degree of superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value
When, aperture is carried out to aeration valve and turns control down.So as to greatest extent ensure compressor among efficient tonifying Qi while,
Prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation.
In addition, the second vapor injection control method of two stage centrifugal unit according to the above embodiment of the present invention can also have with
Under additional technical characteristic：
In one embodiment of the invention, if the two level suction superheat is more than the default suction superheat upper limit
Value or the secondary exhaust degree of superheat are more than default discharge superheat upper limit value, then carry out normal energy tune to the aeration valve
Control.
In one embodiment of the invention, if the two level suction superheat is more than or equal to the default suction superheat
It spends lower limiting value and is more than or equal to less than or equal to the default suction superheat upper limit value or the secondary exhaust degree of superheat described
It presets discharge superheat lower limiting value and is less than or equal to the default discharge superheat upper limit value, then control the aperture of the aeration valve
It remains unchanged.
In one embodiment of the invention, described that normal energy regulation and control system is carried out to the aeration valve, including：Described in acquisition
Two level pressure of inspiration(Pi) at two level air entry；Judge whether the two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi) force value；Such as
Two level pressure of inspiration(Pi) described in fruit is not up to the current goal pressure of inspiration(Pi) force value, then carrying out aperture to the aeration valve tunes up/adjust
Small control, so that the two level pressure of inspiration(Pi) reaches the current goal pressure of inspiration(Pi) force value.
In one embodiment of the invention, the current goal pressure of inspiration(Pi) force value is equal to condensing pressure and evaporating pressure multiplies
Long-pending square root.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of non-transitory computer-readable storage medium
Matter is stored thereon with computer program, which realizes the second vapor injection of above-mentioned two stage centrifugal unit when being executed by processor
Control method.
Non-transitorycomputer readable storage medium according to the ... of the embodiment of the present invention, by executing above-mentioned two stage centrifugal machine
The second vapor injection control method of group can prevent absorbing gas belt while ensureing efficient tonifying Qi among compressor to greatest extent
Liquid influences the reliability of self-operating under unit variable parameter operation.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of two stage centrifugal unit, including：Twin-stage from
Heart compressor；The level-one air entry of evaporator and condenser, the two stage centrifugal compressor is connected with one end of the evaporator,
The secondary exhaust of the two stage centrifugal compressor is connected with one end of the condenser；Economizer and aeration valve, the economy
Device is arranged between the other end and the other end of the condenser of the evaporator, and the economizer also passes through the aeration valve
It is respectively connected with the level-one exhaust outlet and two level air entry of the two stage centrifugal compressor；Control module, for obtaining described two
Two level suction superheat at grade air entry or the secondary exhaust degree of superheat at the secondary exhaust, and judge described two
Whether grade suction superheat is less than default suction superheat lower limiting value or whether the secondary exhaust degree of superheat is less than default row
Gas degree of superheat lower limiting value, wherein if the two level suction superheat is less than the default suction superheat lower limiting value, Huo Zhesuo
It states the secondary exhaust degree of superheat and is less than the default discharge superheat lower limiting value, the control module then opens the aeration valve
Degree turns control down.
Two stage centrifugal unit according to the ... of the embodiment of the present invention obtains the two level air-breathing at two level air entry by control module
The secondary exhaust degree of superheat at the degree of superheat or secondary exhaust, and judge whether two level suction superheat is less than default air-breathing
Whether degree of superheat lower limiting value or the secondary exhaust degree of superheat are less than default discharge superheat lower limiting value, and in two level suction superheat
When degree is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat less than default discharge superheat lower limiting value, pass through
Control module then carries out aperture to aeration valve and turns control down, so as to ensure efficient tonifying Qi among compressor to greatest extent
While, prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation.
In addition, two stage centrifugal unit according to the above embodiment of the present invention can also have following additional technical characteristic：
In one embodiment of the invention, if the two level suction superheat is more than the default suction superheat upper limit
Value or the secondary exhaust degree of superheat are more than default discharge superheat upper limit value, and the control module is then to the aeration valve
Carry out normal energy regulation and control system.
In one embodiment of the invention, if the two level suction superheat is more than or equal to the default suction superheat
It spends lower limiting value and is more than or equal to less than or equal to the default suction superheat upper limit value or the secondary exhaust degree of superheat described
Default discharge superheat lower limiting value and it is less than or equal to the default discharge superheat upper limit value, described in the control module then controls
The aperture of aeration valve remains unchanged.
In one embodiment of the invention, the control module to the aeration valve carry out normal energy regulation and control it is processed when,
Wherein, the control module obtains the two level pressure of inspiration(Pi) at the two level air entry, and judges that the two level pressure of inspiration(Pi) is
It is no to reach current goal pressure of inspiration(Pi) force value, wherein if the two level pressure of inspiration(Pi) is not up to the current goal pressure of inspiration(Pi)
Value, the control module then carries out aperture to the aeration valve and tunes up/turn down control, so that the two level pressure of inspiration(Pi) reaches institute
State current goal pressure of inspiration(Pi) force value.
In one embodiment of the invention, the current goal pressure of inspiration(Pi) force value is equal to condensing pressure and evaporating pressure multiplies
Long-pending square root.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the structural schematic diagram according to the two stage centrifugal unit of one embodiment of the invention；
Fig. 2 is the structural schematic diagram according to the two stage centrifugal unit of another embodiment of the present invention；
Fig. 3 is the flow chart according to the second vapor injection control method of the two stage centrifugal unit of the embodiment of the present invention；
Fig. 4 is the judgement schematic diagram according to the second vapor injection control of the two stage centrifugal unit of one embodiment of the invention；
Fig. 5 is the flow chart that normal energy regulation and control system is carried out to aeration valve according to one embodiment of the invention；
Fig. 6 is the flow chart of the second vapor injection control method of two stage centrifugal unit according to an embodiment of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Describe with reference to the accompanying drawings the two stage centrifugal unit proposed according to embodiments of the present invention second vapor injection control method,
Non-transitorycomputer readable storage medium and two stage centrifugal unit.
In an embodiment of the present invention, as shown in Figure 1 or 2, two stage centrifugal unit may include：Two stage centrifugal compressor 1,
Evaporator 2, condenser 3, economizer 4 and aeration valve 5.
Wherein, the level-one air entry of two stage centrifugal compressor 1 is connected with one end of evaporator 2, two stage centrifugal compressor 1
Secondary exhaust is connected with one end of condenser 3, and economy is provided between the other end and the other end of condenser 3 of evaporator 2
Device 4, economizer 4 are also respectively connected with by aeration valve 5 and the level-one exhaust outlet and two level air entry of two stage centrifugal compressor 1.
As shown in Figure 1 or 2, during tonifying Qi, due to being that gas-liquid two-phase state is cold at the air source economizer of second vapor injection
Matchmaker, so generally will appear benefit gas carrying liquid, but since refrigerant can become superheat state after compressor one stage of compression, with centre
Still it is often superheat state after tonifying Qi mixes.But in actual moving process, exports and load due to unit itself
Change various, under the conditions of the bad working environments of part it is possible that the case where two level absorbing gas belt liquid, and uses original holding unit
The gas supply control scheme of efficiency will be unfavorable for the reliability service of unit.Therefore, the present invention proposes a kind of two stage centrifugal unit
Second vapor injection control method, it is intended to solve while ensureing efficient tonifying Qi among compressor to greatest extent, to prevent absorbing gas belt
Liquid influences the reliability of self-operating under unit variable parameter operation.
Fig. 3 is the flow chart of the second vapor injection control method of two stage centrifugal unit according to the ... of the embodiment of the present invention.Such as Fig. 3 institutes
Show, the second vapor injection control method of the two stage centrifugal unit of the embodiment of the present invention may include following steps：
S1 obtains the two level suction superheat at two level air entry or the secondary exhaust degree of superheat at secondary exhaust.
Specifically, as shown in Figure 1, temperature sensor and pressure can be arranged at the two level air entry of two stage centrifugal compressor
Sensor to detect the two level suction temperature T1 and two level pressure of inspiration(Pi) P1 at two level air entry, and obtains two level pressure of inspiration(Pi)
The corresponding saturation temperature Tp1 of P1 calculate the two level suction superheat Tsh1 obtained at two level air entry according to T1 and Tp1, i.e.,
Tsh1=T1-Tp1.
Alternatively, as shown in Fig. 2, temperature sensor and pressure sensing are arranged at the secondary exhaust of two stage centrifugal compressor
Device to detect the secondary exhaust temperature T2 and secondary exhaust pressure P2 at secondary exhaust, and obtains P2 pairs of secondary exhaust pressure
The saturation temperature Tp2 answered calculates the secondary exhaust degree of superheat Tsh2, i.e. Tsh2=obtained at secondary exhaust according to T2 and Tp2
T2-Tp2.Wherein, the corresponding saturation temperature Tp2 of secondary exhaust pressure P2 can be replaced by the corresponding saturation temperature of condensing pressure, with
Reduce the setting of pressure sensor.
S2, judges whether two level suction superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat
Whether default discharge superheat lower limiting value is less than.
Wherein, it presets suction superheat lower limiting value and default discharge superheat lower limiting value can be by those skilled in the art
It is configured according to actual conditions, is not specifically limited herein, for example, the value range of default suction superheat lower limiting value can be with
It is 0~3 DEG C.
S3, if two level suction superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat is less than
Default discharge superheat lower limiting value then carries out aperture to aeration valve and turns control down.
Specifically, for carrying out second vapor injection control according to two level suction superheat Tsh1.
As shown in figure 4, after obtaining two level suction superheat Tsh1, judge whether two level suction superheat Tsh1 is small
In default suction superheat lower limiting value △ Tsh1_b (e.g., 2 DEG C), if it is, showing the liquid refrigerants mistake due to second vapor injection
It is more so that two level absorbing gas belt liquid aggravates, so carrying out aperture to aeration valve at this time turns control down, as in current tonifying Qi valve opening
On the basis of reduce certain aperture △ Exv (by 480P be full gate degree valve body for, the value range of aperture △ Exv can be
20~40P), with eliminate second vapor injection band liquid, so as to greatest extent ensure compressor among efficient tonifying Qi while,
Prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation.
It should be noted that if the aperture of current aeration valve has been minimum aperture 0P, when control is turned in execution down
When, that is, keep completely closed state.In addition, according to secondary exhaust degree of superheat Tsh2 carry out the control logic of second vapor injection control with
The control logic that second vapor injection control is carried out according to two level suction superheat Tsh1 is identical, just repeats no more here.
Further, in one embodiment of the invention, if two level suction superheat is more than default suction superheat
Upper limit value or the secondary exhaust degree of superheat are more than default discharge superheat upper limit value, then aeration valve is kept to carry out normal energy regulation and control
System.Wherein, preset suction superheat upper limit value and default discharge superheat upper limit value can by those skilled in the art according to
Actual conditions are configured, and are not specifically limited herein, for example, the value range of default suction superheat upper limit value can be 3
~10 DEG C.
Specifically, still for carrying out second vapor injection control according to two level suction superheat Tsh1.As shown in figure 4, such as
Fruit two level suction superheat Tsh1 is more than default suction superheat upper limit value △ Tsh1_a (e.g., 8 DEG C), then show current twin-stage from
Scheming group is reliable for operation, can be controlled aeration valve according to normal energy regulation and control system.And according to the secondary exhaust degree of superheat
Tsh2 carries out the control logic of second vapor injection control and the control that second vapor injection control is carried out according to two level suction superheat Tsh1
Logic is identical, just repeats no more here.
In one embodiment of the invention, as shown in figure 5, carrying out normal energy regulation and control system, including following step to aeration valve
Suddenly：
S501 obtains the two level pressure of inspiration(Pi) at two level air entry.
S502, judges whether two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi) force value.
In one embodiment of the invention, current goal pressure of inspiration(Pi) force value is equal to condensing pressure and evaporating pressure product
Square root.
S503, if two level pressure of inspiration(Pi) is not up to current goal pressure of inspiration(Pi) force value, to aeration valve carry out aperture tune up/
Control is turned down, so that two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi) force value.
Specifically, normal energy regulation and control system is being carried out to aeration valve, target pressure of inspiration(Pi) can be reached according to two level pressure of inspiration(Pi) P1
Force value carries out the aperture of aeration valve to tune up/turn down control, to play the best two-stage compression performance of unit.For example, working as
When two level pressure of inspiration(Pi) P1 is less than current goal pressure of inspiration(Pi) force value, the aperture of aeration valve can be tuned up, so that two level air entry pressure
Power P1 rises；When two level pressure of inspiration(Pi) P1 is more than current goal pressure of inspiration(Pi) force value, the aperture of aeration valve can be turned down, so that two
Grade air entry pressure P1 declines, so that two level pressure of inspiration(Pi) P1 is maintained at current goal pressure of inspiration(Pi) force value, so that machine
Group plays best two-stage compression performance.
In one embodiment of the invention, if two level suction superheat is more than or equal to default suction superheat lower limiting value
And it is more than or equal to default discharge superheat lower limiting value less than or equal to default suction superheat upper limit value or the secondary exhaust degree of superheat
And less than or equal to default discharge superheat upper limit value, then the aperture for controlling aeration valve remains unchanged.
Specifically, still for carrying out second vapor injection control according to two level suction superheat Tsh1.As shown in figure 4, if
Two level suction superheat Tsh1 is more than or equal to default suction superheat lower limiting value △ Tsh1_b (e.g., 2 DEG C) and less than or equal to default
Suction superheat upper limit value △ Tsh1_a (e.g., 8 DEG C), then the aperture for controlling aeration valve remains unchanged.And according to secondary exhaust mistake
The control logic that temperature Tsh2 carries out second vapor injection control carries out second vapor injection control with according to two level suction superheat Tsh1
Control logic is identical, just repeats no more here.
Further, to enable those skilled in the art to be better understood upon the present invention.
Fig. 6 is the flow chart of the second vapor injection control method of two stage centrifugal unit according to an embodiment of the invention.Such as
Shown in Fig. 6, the second vapor injection control method of the two stage centrifugal unit may include following steps：
S601 judges the two level suction superheat of acquisition.Wherein, if two level suction superheat < presets air-breathing
Degree of superheat lower limiting value, thens follow the steps S602；If default suction superheat lower limiting value≤two level suction superheat≤default suction
Gas degree of superheat upper limit value, thens follow the steps S604.
S602 carries out aeration valve to turn control down.
S603, aeration valve keep current aperture constant.
S604 carries out normal energy regulation and control system to aeration valve.
That is, during unit operation, the dependability parameter of second vapor injection is detected in real time, such as two level air-breathing mistake
Temperature Tsh1 or secondary exhaust degree of superheat Tsh2, when dependability parameter is less than lower warning value, aeration valve carries out reliability control
System such as carries out aperture to aeration valve and turns control down；When dependability parameter is higher than upper warning value, aeration valve, which enters, can normally adjust
Control, such as controls aeration valve according to two level pressure of inspiration(Pi) P1；When dependability parameter is in lower warning value and upper warning value
Between when, keep the aperture of current aeration valve constant, unit continues to run with.
The second vapor injection control method of two stage centrifugal unit according to the ... of the embodiment of the present invention obtains two at two level air entry
The secondary exhaust degree of superheat at grade suction superheat or secondary exhaust, and it is pre- to judge whether two level suction superheat is less than
If whether suction superheat lower limiting value or the secondary exhaust degree of superheat are less than default discharge superheat lower limiting value, and are inhaled in two level
The gas degree of superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value
When, aperture is carried out to aeration valve and turns control down.So as to greatest extent ensure compressor among efficient tonifying Qi while,
It prevents absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation, and is easily achieved.
In addition, the embodiment of the present invention also proposed a kind of non-transitorycomputer readable storage medium, it is stored thereon with
Computer program, the program realize the second vapor injection control method of above-mentioned two stage centrifugal unit when being executed by processor.
The non-transitorycomputer readable storage medium proposed according to embodiments of the present invention, by execute above-mentioned twin-stage from
The second vapor injection control method of scheming group can prevent from inhaling while ensureing efficient tonifying Qi among compressor to greatest extent
Gas carrying liquid influences the reliability of self-operating under unit variable parameter operation.
The two stage centrifugal unit of the embodiment of the present invention is described in detail below.
As shown in Figure 1, the two stage centrifugal unit of the embodiment of the present invention may include：It is two stage centrifugal compressor 1, evaporator 2, cold
Condenser 3, economizer 4, aeration valve 5 and control module (not specifically illustrated in figure).
Wherein, the level-one air entry of two stage centrifugal compressor 1 is connected with one end of evaporator 2, two stage centrifugal compressor 1
Secondary exhaust is connected with one end of condenser 3, economizer 4 be arranged the other end in evaporator 2 and condenser 3 the other end it
Between, economizer 4 is also respectively connected with by aeration valve 5 and the level-one exhaust outlet and two level air entry of two stage centrifugal compressor.Control
Module is used to obtain the secondary exhaust degree of superheat at two level suction superheat or the secondary exhaust at two level air entry, and
Judge whether two level suction superheat be less than default suction superheat lower limiting value or the secondary exhaust degree of superheat less than default
Discharge superheat lower limiting value, wherein if two level suction superheat is less than default suction superheat lower limiting value or secondary exhaust
The degree of superheat is less than default discharge superheat lower limiting value, and control module 6 then carries out aperture to aeration valve and turns control down.
In one embodiment of the invention, if two level suction superheat is more than default suction superheat upper limit value, or
Person's secondary exhaust degree of superheat is more than default discharge superheat upper limit value, and control module then carries out normal energy regulation and control system to aeration valve.
In one embodiment of the invention, if two level suction superheat is more than or equal to default suction superheat lower limiting value
And it is more than or equal to default discharge superheat lower limiting value less than or equal to default suction superheat upper limit value or the secondary exhaust degree of superheat
And less than or equal to default discharge superheat upper limit value, the aperture that control module 6 then controls aeration valve remains unchanged.
In one embodiment of the invention, control module is when processed to aeration valve progress normal energy regulation and control, wherein control
Module obtains the two level pressure of inspiration(Pi) at two level air entry, and judges whether two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi)
Value, wherein if two level pressure of inspiration(Pi) is not up to current goal pressure of inspiration(Pi) force value, control module if carries out aperture tune to aeration valve
Greatly/and turn control down, so that two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi) force value.
In one embodiment of the invention, current goal pressure of inspiration(Pi) force value is equal to condensing pressure and evaporating pressure product
Square root.
It should be noted that the explanation of the aforementioned second vapor injection control method embodiment to two stage centrifugal unit is also fitted
For the two stage centrifugal unit of the embodiment, details are not described herein again.
Two stage centrifugal unit according to the ... of the embodiment of the present invention obtains the two level air-breathing at two level air entry by control module
The secondary exhaust degree of superheat at the degree of superheat or secondary exhaust, and judge whether two level suction superheat is less than default air-breathing
Whether degree of superheat lower limiting value or the secondary exhaust degree of superheat are less than default discharge superheat lower limiting value, and in two level suction superheat
When degree is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat less than default discharge superheat lower limiting value, pass through
Control module then carries out aperture to aeration valve and turns control down, so as to ensure efficient tonifying Qi among compressor to greatest extent
While, prevent absorbing gas belt liquid from influencing the reliability of self-operating under unit variable parameter operation.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of second vapor injection control method of two stage centrifugal unit, which is characterized in that the two stage centrifugal unit includes twin-stage
Centrifugal compressor, evaporator, condenser, economizer and aeration valve, the level-one air entry of the two stage centrifugal compressor with it is described
One end of evaporator is connected, and the secondary exhaust of the two stage centrifugal compressor is connected with one end of the condenser, the steaming
It is provided with the economizer between the other end and the other end of the condenser of hair device, the economizer also passes through the tonifying Qi
The level-one exhaust outlet and two level air entry of valve and the two stage centrifugal compressor are respectively connected with, and the described method comprises the following steps：
Obtain the two level suction superheat at the two level air entry or the secondary exhaust overheat at the secondary exhaust
Degree；
Judge whether the two level suction superheat is less than default suction superheat lower limiting value or the secondary exhaust degree of superheat
Whether default discharge superheat lower limiting value is less than；
If the two level suction superheat is less than the default suction superheat lower limiting value or the secondary exhaust degree of superheat
Less than the default discharge superheat lower limiting value, then aperture is carried out to the aeration valve and turn control down.
2. the second vapor injection control method of two stage centrifugal unit as described in claim 1, which is characterized in that if the two level
Suction superheat is more than default suction superheat upper limit value or the secondary exhaust degree of superheat is more than on default discharge superheat
Limit value then carries out normal energy regulation and control system to the aeration valve.
3. the second vapor injection control method of two stage centrifugal unit as claimed in claim 2, which is characterized in that if the two level
Suction superheat is more than or equal to the default suction superheat lower limiting value and is less than or equal to the default suction superheat upper limit value,
Or the secondary exhaust degree of superheat is more than or equal to the default discharge superheat lower limiting value and is less than or equal to the default exhaust
Degree of superheat upper limit value, the then aperture for controlling the aeration valve remain unchanged.
4. the second vapor injection control method of two stage centrifugal unit as claimed in claim 2, which is characterized in that described to the benefit
Air valve carries out normal energy regulation and control system, including：
Obtain the two level pressure of inspiration(Pi) at the two level air entry；
Judge whether the two level pressure of inspiration(Pi) reaches current goal pressure of inspiration(Pi) force value；
If the two level pressure of inspiration(Pi) is not up to the current goal pressure of inspiration(Pi) force value, aperture tune is carried out to the aeration valve
Greatly/and turn control down, so that the two level pressure of inspiration(Pi) reaches the current goal pressure of inspiration(Pi) force value.
5. the second vapor injection control method of two stage centrifugal unit as claimed in claim 4, which is characterized in that the current goal
Pressure of inspiration(Pi) force value is equal to the square root of condensing pressure and evaporating pressure product.
6. a kind of non-transitorycomputer readable storage medium, is stored thereon with computer program, which is characterized in that the program quilt
The second vapor injection control method of the two stage centrifugal unit as described in any in claim 1-5 is realized when processor executes.
7. a kind of two stage centrifugal unit, which is characterized in that including：
Two stage centrifugal compressor；
The level-one air entry of evaporator and condenser, the two stage centrifugal compressor is connected with one end of the evaporator, described
The secondary exhaust of two stage centrifugal compressor is connected with one end of the condenser；
Economizer and aeration valve, the economizer be arranged the other end in the evaporator and the condenser the other end it
Between, the economizer is also distinguished by the level-one exhaust outlet and two level air entry of the aeration valve and the two stage centrifugal compressor
It is connected；
Control module, for obtaining at two level suction superheat or the secondary exhaust at the two level air entry
The secondary exhaust degree of superheat, and judge whether the two level suction superheat is less than default suction superheat lower limiting value or described
Whether the secondary exhaust degree of superheat is less than default discharge superheat lower limiting value, wherein if the two level suction superheat is less than institute
It states default suction superheat lower limiting value or the secondary exhaust degree of superheat is less than the default discharge superheat lower limiting value, institute
It states control module and then down control is turned to aeration valve progress aperture.
8. two stage centrifugal unit as claimed in claim 7, which is characterized in that preset if the two level suction superheat is more than
Suction superheat upper limit value or the secondary exhaust degree of superheat are more than default discharge superheat upper limit value, the control module
Normal energy regulation and control system then is carried out to the aeration valve.
9. two stage centrifugal unit as claimed in claim 8, which is characterized in that if the two level suction superheat is more than or equal to
The default suction superheat lower limiting value and be less than or equal to the default suction superheat upper limit value or the secondary exhaust mistake
Temperature is more than or equal to the default discharge superheat lower limiting value and is less than or equal to the default discharge superheat upper limit value, the control
The aperture that molding block then controls the aeration valve remains unchanged.
10. two stage centrifugal unit as claimed in claim 8, which is characterized in that the control module to the aeration valve into
When the regulation and control of row normal energy are processed, wherein
The control module obtains the two level pressure of inspiration(Pi) at the two level air entry, and whether judges the two level pressure of inspiration(Pi)
Reach current goal pressure of inspiration(Pi) force value, wherein if the two level pressure of inspiration(Pi) is not up to the current goal pressure of inspiration(Pi) force value,
The control module then carries out aperture to the aeration valve and tunes up/turn down control, so that the two level pressure of inspiration(Pi) reaches described
Current goal pressure of inspiration(Pi) force value.
11. two stage centrifugal unit as claimed in claim 10, which is characterized in that the current goal pressure of inspiration(Pi) force value is equal to cold
The square root of solidifying pressure and evaporating pressure product.
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