CN103629873A - Control method of two-stage compression air conditioning system - Google Patents
Control method of two-stage compression air conditioning system Download PDFInfo
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Abstract
The invention discloses a control method of a two-stage compression air conditioning system. The control method includes the steps that 100, temperature parameters of an air suction temperature T1, an evaporator tube wall temperature T2, a compressor air replenishment port temperature T3 and a temperature T4 after one-stage throttling are collected; 200, whether air suction superheat degree delta sh air suction is in a set range or not is judged according to the collected temperatures, if the air suction superheat degree delta sh air suction is in the set range, a step 300 is executed, if the air suction superheat degree delta sh air suction is not in the set range, the opening of a first throttling device is adjusted; if the air suction superheat degree delta sh air suction is not adjusted into the set range, the opening of a second throttling device is adjusted, and then the opening of the first throttling device is adjusted until the air suction superheat degree delta sh air suction is in the set range; 300, whether air replenishment superheat degree delta sh air replenishment is in a set range or not is judged, if the air replenishment superheat degree delta sh air replenishment is in the set range, the opening of the throttling devices is not changed, and normal operation is performed; if the air replenishment superheat degree delta sh air replenishment is not in the set range, the opening of the second throttling device is adjusted until the air replenishment superheat degree delta sh air replenishment is in the set range, and then the step 100 and the step 200 are executed. The performance and the reliability of the air conditioning system are improved.
Description
Technical field
The present invention relates to refrigerating field, particularly relate to a kind of control method of Two-stage Compression air-conditioning system.
Background technology
At present; air-conditioning products promotes under the promotion of policy in national efficiency; energy-efficient performance is better than in the past; appearance along with convertible frequency air-conditioner; to starting rear fast cooling, intensification, the steady control of environment temperature has all had obvious progress than constant speed air-conditioning, and; converter technique can be avoided shutting down frequently and starting, and energy-conservation and reliability compressor are had to good advantage.Although transducer air conditioning has had progress clearly than constant speed air-conditioning in energy-conservation and comfortableness,, under some severe extreme weather conditions, still there are some shortcomings.Such as: high-temperature refrigeration amount, ultralow temperature heating capacity etc., cannot satisfy the demands of consumers completely.Two-stage Compression air-conditioning system increases enthalpy by tonifying Qi can overcome above shortcoming, and still, if the tonifying Qi state of system or the ability of heat exchanger are not controlled, under some condition, performance can reduce on the contrary.For example, under low temperature environment, when evaporating temperature is too low, the compression ratio increase of compressor can cause excessive discharge temperature, causes air-conditioning system easily to occur back liquid, when serious, can make compressor damage, and therefore, control method still needs further perfect.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of control method of scientific and rational Two-stage Compression air-conditioning system, the present invention realizes the technical scheme that above-mentioned purpose adopts and is:
A kind of control method of Two-stage Compression air-conditioning system, described Two-stage Compression air-conditioning system comprises by compressor, cross valve, the second heat exchanger, flash vessel and First Heat Exchanger and is in turn connected to form closed circuit with working medium tube, between First Heat Exchanger and flash vessel, be provided with first throttle device, between the second heat exchanger and flash vessel, be provided with the second throttling arrangement, between compressor and flash vessel, be provided with control valve, by described first throttle device and the second throttling arrangement, suction superheat and the tonifying Qi degree of superheat are regulated, comprise the following steps:
S100: the temperature parameter of temperature T 4 after collection suction temperature T1, First Heat Exchanger tube wall temperature T2, compressor gas supplementing opening temperature T 3 and one-level throttling;
S200: according to the temperature collecting, judge that suction superheat △ sh is air-breathing whether in setting range, wherein △ sh air-breathing=T1-T2; If in setting range, enter step S300;
If not in the scope of setting, regulate the aperture of first throttle device; If regulate less than setting range, regulate the aperture of the second throttling arrangement, and then regulate the aperture of first throttle device, until reach setting range;
S300: judge that whether tonifying Qi degree of superheat △ sh tonifying Qi is at setting range, △ sh tonifying Qi=T3-T4 wherein, if in the scope of setting, the constant normal operation of throttling arrangement aperture; If do not regulate the aperture of the second throttling arrangement at setting range, until reach setting range, then return to operating procedure S100～S200.
More preferably, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the scope of 0.5 ℃～10 ℃;
When 0.5 ℃≤△ sh air-breathing≤10 ℃, forward S300 to;
As the air-breathing <0.5 ℃ of △ sh, turn the aperture of first throttle device down, if do not reach setting range, turn the aperture of the second throttling arrangement down, and then turn the aperture of first throttle device down;
As 10 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device; If do not reach setting range, tune up the aperture of the second throttling arrangement; And then the aperture of adjusting first throttle device.
More preferably, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the scope of 1 ℃～8 ℃;
When 1 ℃≤△ sh air-breathing≤8 ℃, forward S300 to;
As the air-breathing <1 ℃ of △ sh, turn the aperture of first throttle device down, if do not reach setting range, turn the aperture of the second throttling arrangement down, and then turn the aperture of first throttle device down;
As 8 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device; If do not reach setting range, tune up the aperture of the second throttling arrangement; And then the aperture of adjusting first throttle device.
More preferably, described step S300 comprises the steps:
Judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 0.5 ℃～10 ℃;
When 0.5 ℃≤△ sh tonifying Qi≤10 ℃, each throttling arrangement aperture is constant;
When <0.5 ℃ of △ sh tonifying Qi, turn the aperture of the second throttling arrangement down, until 0.5 ℃≤△ sh tonifying Qi≤10 ℃;
When 10 ℃ of △ sh tonifying Qi >, tune up the aperture of the second throttling arrangement, until 0.5 ℃≤△ sh tonifying Qi≤10 ℃.
More preferably, described step S300 comprises the steps:
Judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 1 ℃～5 ℃;
When 1 ℃≤△ sh tonifying Qi≤5 ℃, each throttling arrangement aperture is constant;
When <1 ℃ of △ sh tonifying Qi, turn the aperture of choke valve 7b down, until 1 ℃≤△ sh tonifying Qi≤5 ℃;
When 5 ℃ of △ sh tonifying Qi >, tune up the aperture of choke valve 7b, until 1 ℃≤△ sh tonifying Qi≤5 ℃.
More preferably, described working medium tube is air intake duct, blast pipe and/or blowdown pipe.
More preferably, the diameter D1 of described air intake duct is, the relation between the diameter D3 of the diameter D2 of blast pipe and/or blowdown pipe is as follows:
D1〉D2〉D3，0.3<D3/D1<0.9,0.5<D2/D1<1。
More preferably, regulation of series valve in the connecting line between described compressor and described flash vessel, described control valve, for controlling the liquid level in described flash vessel, makes the liquid level in described flash vessel be no more than 1/2 of described flash vessel internal height.
More preferably, described control valve is magnetic valve or electric expansion valve.
More preferably, described first throttle device and the second throttling arrangement are electric expansion valve.
More preferably, described temperature T 2 is the temperature of described First Heat Exchanger middle part temperature or close entrance end.
The invention has the beneficial effects as follows: the present invention is by controlling to adjust the suction superheat of two-stage enthalpy increasing system compresses machine and the tonifying Qi degree of superheat, the degree of superheat that has guaranteed system is controlled in preferred range, improved the Performance And Reliability of air-conditioning system, make Two-stage Compression air-conditioning system increase enthalpy by tonifying Qi and can not only meet ability and the efficiency requirement under nominal condition, and heat under condition all higher than general air-conditioning system at high-temperature refrigeration and ultralow temperature.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiment of the present invention air-conditioning system;
Fig. 2 is the flow chart of control method one embodiment of the present invention;
Fig. 3 is the degree of superheat and COP relationship change curve map;
Wherein,
1 compressor; 11 air intake ducts; 12 blowdown pipes; 13 blast pipes; 2 cross valves; 3 second heat exchangers; 4 First Heat Exchangers; 5 flash vessels; 6. control valve; 7a first throttle device; 7b the second throttling arrangement;
T1 suction temperature; T2 First Heat Exchanger tube wall temperature, T3 compressor gas supplementing opening temperature; Temperature after the throttling of T4 one-level, T1-T2 is that suction superheat △ sh is air-breathing, T3-T4 is tonifying Qi degree of superheat △ sh tonifying Qi.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the control method of Two-stage Compression air-conditioning system of the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, a kind of Two-stage Compression air-conditioning system, comprise compressor 1, cross valve 2, First Heat Exchanger 4, the second heat exchanger 3, first throttle device 7a, the second throttling arrangement 7b, flash vessel 5, flash vessel 5 comprises the first fluid-through port, the second fluid-through port and blow vent; First throttle device 7a and the second throttling arrangement 7b are electric expansion valve;
The high-pressure side of compressor 1, low-pressure end is communicated with wherein two ports of cross valve 2 by blast pipe 13 and muffler 11 respectively, First Heat Exchanger 4, the first side of the second heat exchanger 3 is communicated with another two ports of cross valve 2 by muffler 11 and blast pipe 13 respectively, First Heat Exchanger 4, the second side of the second heat exchanger 3 is the first fluid-through port with flash vessel 5 by two blast pipes 13 respectively, the second fluid-through port UNICOM, first throttle device 7a, the second throttling arrangement 7b is arranged at respectively on two blast pipes 13, first throttle device 7a is series in the path between First Heat Exchanger 4 and flash vessel 5, the second throttling arrangement 7b is series in the path between the second heat exchanger 3 and flash vessel 5, the blow vent of flash vessel 5 is communicated with the gas supplementing opening of compressor 1 by blowdown pipe 12, on blowdown pipe 12, be provided with control valve 6, preferably, control valve 6 is magnetic valve or electric expansion valve.
In Two-stage Compression air-conditioning system, the relation between the diameter D1 of air intake duct 11, the diameter D2 of blast pipe 13 and the diameter D3 of blowdown pipe 12 is as follows: D1 > D2 > D3; 0.3<D3/D1<0.9,0.5<D2/D1<1.
Twin-stage air-conditioning system has two kinds of mode of operations, is respectively refrigeration mode and heating mode.
Under refrigeration mode, heat-exchange working medium is under the effect of compressor 1, through cross valve 2, entering the second heat exchanger 3(is condenser), and through the second throttling arrangement 7b throttling, this throttling is one-level throttling, heat-exchange working medium after one-level throttling enters flash vessel by the first fluid-through port of flash vessel 5, the heat-exchange working medium on the inner chamber top of flash vessel 5 shwoot that constantly absorbs heat, the gaseous state heat-exchange working medium of shwoot flows into the tonifying Qi end of compressor 1 by the blow vent at flash vessel 5 tops, after the heat-exchange working medium heat release of the inner chamber bottom of flash vessel 5, temperature reduces, form the heat-exchange working medium of supercooled liquid, the heat-exchange working medium of supercooled liquid enters first throttle device 7a by the second fluid-through port of flash vessel 5, after first throttle device 7a throttling, enter the first heat-exchanger rig 4 (being evaporimeter), finally by cross valve 2, flow back to compressor 1,
Under heating mode, heat-exchange working medium is under the effect of compressor 1, through cross valve 2, entering the first heat-exchanger rig 4(is condenser), and through first throttle device 7a throttling, this throttling is one-level throttling, heat-exchange working medium after one-level throttling enters flash vessel 5 by the second fluid-through port of flash vessel 5, the heat-exchange working medium on the inner chamber top of flash vessel 5 shwoot that constantly absorbs heat, the gaseous state heat-exchange working medium of shwoot flows into the tonifying Qi end of compressor 1 by the blow vent of the inner cavity top of flash vessel 5, after the heat-exchange working medium heat release of the inner chamber bottom of flash vessel 5, temperature reduces, form the heat-exchange working medium of supercooled liquid, the heat-exchange working medium of supercooled liquid enters the second throttling arrangement 7b by the first fluid-through port of flash vessel 5, after the second throttling arrangement 7b throttling, enter the second heat exchanger 3 (being evaporimeter), finally by cross valve 2, flow back to compressor 1, system increases enthalpy by two stages of compression, improved the runnability of air-conditioning system.
With reference to Fig. 2, in the running of Two-stage Compression air-conditioning system, the control method of employing comprises the following steps:
S100: the temperature parameter of temperature T 4 after collection suction temperature T1, First Heat Exchanger tube wall temperature T2, compressor gas supplementing opening temperature T 3 and one-level throttling;
S200: according to the temperature collecting, judge that suction superheat △ sh is air-breathing whether in setting range, wherein △ sh air-breathing=T1-T2; If in setting range, enter step S300;
If not in the scope of setting, regulate the aperture of first throttle device 7a; If regulate less than setting range, regulate the aperture of the second throttling arrangement 7b, and then regulate the aperture of first throttle device 7a, until reach setting range;
S300: judge that whether tonifying Qi degree of superheat △ sh tonifying Qi is at setting range, △ sh tonifying Qi=T3-T4 wherein, if in the scope of setting, the constant normal operation of throttling arrangement aperture; If do not regulate the aperture of the second throttling arrangement 7b at setting range, until then setting range returns to operating procedure S100～S200.
Preferably, as a kind of embodiment, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the 0.5 ℃～scope of 10 ℃ (K);
When 0.5 ℃≤△ sh air-breathing≤10 ℃, forward S300 to;
As the air-breathing <0.5 ℃ of △ sh, turn the aperture of first throttle device 7a down, if do not reach setting range, turn the aperture of the second throttling arrangement 7b down, and then turn the aperture of first throttle device 7a down;
As 10 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device 7a; If do not reach setting range, tune up the aperture of the second throttling arrangement 7b; And then the aperture of adjusting first throttle device 7a.
Preferably, as a kind of embodiment, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the scope of 1 ℃～8 ℃;
When 1 ℃≤△ sh air-breathing≤8 ℃, forward S300 to;
As the air-breathing <1 ℃ of △ sh, turn the aperture of first throttle device 7a down, if do not reach setting range, turn the aperture of the second throttling arrangement 7b down, and then turn the aperture of first throttle device 7a down;
As 8 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device 7a; If do not reach setting range, tune up the aperture of the second throttling arrangement 7b; And then the aperture of adjusting first throttle device 7a;
Preferably, as a kind of embodiment, described step S300 comprises the steps: to judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 0.5 ℃～10 ℃;
When 0.5 ℃≤△ sh tonifying Qi≤10 ℃, each throttling arrangement aperture is constant;
When <0.5 ℃ of △ sh tonifying Qi, turn the aperture of the second throttling arrangement 7b down, until 0.5 ℃≤△ sh tonifying Qi≤10 ℃;
When 10 ℃ of △ sh tonifying Qi >, tune up the aperture of the second throttling arrangement 7b, until 0.5 ℃≤△ sh tonifying Qi≤10 ℃.
Preferably, as a kind of embodiment, described step S300 comprises the steps:
Judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 1 ℃～5 ℃;
When 1 ℃≤△ sh tonifying Qi≤5 ℃, each throttling arrangement aperture is constant;
When <1 ℃ of △ sh tonifying Qi, turn the aperture of the second throttling arrangement 7b down, until 1 ℃≤△ sh tonifying Qi≤5 ℃;
When 5 ℃ of △ sh tonifying Qi >, tune up the aperture of the second throttling arrangement 7b, until 1 ℃≤△ sh tonifying Qi≤5 ℃.
In Two-stage Compression air-conditioning system running, control valve 6, for controlling the liquid level in described flash vessel, makes the liquid level in flash vessel 5 be no more than 1/2 of flash vessel 5 internal height.
Described temperature T 2 is the temperature at evaporimeter middle part or the temperature of close entrance end.
As shown in Figure 3, as can be seen from the figure, the tonifying Qi degree of superheat and suction superheat are within the scope of 1 to N for the degree of superheat and COP relationship change curve, and systematic energy efficiency ratio is in optimum range, and the span of N value is 5～10.
By the air-breathing and control tonifying Qi degree of superheat, guarantee system overheat degree, improve systematic function, the integrity problem of avoiding liquid hammer to cause; By the air-breathing and control tonifying Qi degree of superheat, guarantee that systematic function, all in an optimum range, plays energy-conservation effect under various conditions.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (11)
1. the control method of a Two-stage Compression air-conditioning system, described Two-stage Compression air-conditioning system comprises by compressor, cross valve, the second heat exchanger, flash vessel and First Heat Exchanger and is in turn connected to form closed circuit with working medium tube, between First Heat Exchanger and flash vessel, be provided with first throttle device, between the second heat exchanger and flash vessel, be provided with the second throttling arrangement, between compressor and flash vessel, be provided with control valve, by described first throttle device and the second throttling arrangement, suction superheat and the tonifying Qi degree of superheat are regulated, it is characterized in that, comprise the following steps:
S100: the temperature parameter of temperature T 4 after collection suction temperature T1, First Heat Exchanger tube wall temperature T2, compressor gas supplementing opening temperature T 3 and one-level throttling;
S200: according to the temperature collecting, judge that suction superheat △ sh is air-breathing whether in setting range, wherein △ sh air-breathing=T1-T2; If in setting range, enter step S300;
If not in the scope of setting, regulate the aperture of first throttle device; If regulate less than setting range, regulate the aperture of the second throttling arrangement, and then regulate the aperture of first throttle device, until reach setting range;
S300: judge that whether tonifying Qi degree of superheat △ sh tonifying Qi is at setting range, △ sh tonifying Qi=T3-T4 wherein, if in the scope of setting, the constant normal operation of throttling arrangement aperture; If do not regulate the aperture of the second throttling arrangement at setting range, until reach setting range, then return to operating procedure S100～S200.
2. the control method of Two-stage Compression air-conditioning system according to claim 1, is characterized in that, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the scope of 0.5 ℃～10 ℃;
When 0.5 ℃≤△ sh air-breathing≤10 ℃, forward S300 to;
As the air-breathing <0.5 ℃ of △ sh, turn the aperture of first throttle device down, if do not reach setting range, turn the aperture of the second throttling arrangement down, and then turn the aperture of first throttle device down;
As 10 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device; If do not reach setting range, tune up the aperture of the second throttling arrangement; And then the aperture of adjusting first throttle device.
3. the control method of Two-stage Compression air-conditioning system according to claim 1, is characterized in that, described step S200 comprises the steps:
Judge that △ sh is air-breathing whether in the scope of 1 ℃～8 ℃;
When 1 ℃≤△ sh air-breathing≤8 ℃, forward S300 to;
As the air-breathing <1 ℃ of △ sh, turn the aperture of first throttle device down, if do not reach setting range, turn the aperture of the second throttling arrangement down, and then turn the aperture of first throttle device down;
As 8 ℃ of the air-breathing > of △ sh, tune up the aperture of first throttle device; If do not reach setting range, tune up the aperture of the second throttling arrangement; And then the aperture of adjusting first throttle device.
4. the control method of Two-stage Compression air-conditioning system according to claim 2, is characterized in that, described step S300 comprises the steps:
Judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 0.5 ℃～10 ℃;
When 0.5 ℃≤△ sh tonifying Qi≤10 ℃, each throttling arrangement aperture is constant;
When <0.5 ℃ of △ sh tonifying Qi, turn the aperture of the second throttling arrangement down, until 0.5 ℃≤△ sh tonifying Qi≤10 ℃;
When 10 ℃ of △ sh tonifying Qi >, tune up the aperture of the second throttling arrangement, until 1 ℃≤△ sh tonifying Qi≤10 ℃.
5. the control method of Two-stage Compression air-conditioning system according to claim 3, is characterized in that, described step S300 comprises the steps:
Judge that tonifying Qi degree of superheat △ sh tonifying Qi is whether in the scope of 1 ℃～5 ℃;
When 1 ℃≤△ sh tonifying Qi≤5 ℃, each throttling arrangement aperture is constant;
When <1 ℃ of △ sh tonifying Qi, turn the aperture of choke valve 7b down, until 1 ℃≤△ sh tonifying Qi≤5 ℃;
When 5 ℃ of △ sh tonifying Qi >, tune up the aperture of choke valve 7b, until 1 ℃≤△ sh tonifying Qi≤5 ℃.
6. according to the control method of the Two-stage Compression air-conditioning system described in claim 1 to 5 any one, it is characterized in that:
Described working medium tube is air intake duct, blast pipe and/or blowdown pipe.
7. the control method of Two-stage Compression air-conditioning system according to claim 6, is characterized in that:
Relation between the diameter D3 of the diameter D1 of described air intake duct, the diameter D2 of blast pipe and/or blowdown pipe is as follows:
D1〉D2〉D3，0.3<D3/D1<0.9,0.5<D2/D1<1。
8. according to the control method of the Two-stage Compression air-conditioning system described in claim 1 to 5 any one, it is characterized in that:
Regulation of series valve in connecting line between described compressor and described flash vessel, described control valve, for controlling the liquid level in described flash vessel, makes the liquid level in described flash vessel be no more than 1/2 of described flash vessel internal height.
9. the control method of Two-stage Compression air-conditioning system according to claim 8, is characterized in that:
Described control valve is magnetic valve or electric expansion valve.
10. according to the control method of the Two-stage Compression air-conditioning system described in claim 1 to 5 any one, it is characterized in that:
Described first throttle device and the second throttling arrangement are electric expansion valve.
11. according to the control method of the Two-stage Compression air-conditioning system described in claim 1 to 5 any one, it is characterized in that:
Described temperature T 2 is the temperature of described First Heat Exchanger middle part temperature or close entrance end.
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