CN104736944A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN104736944A CN104736944A CN201380055419.0A CN201380055419A CN104736944A CN 104736944 A CN104736944 A CN 104736944A CN 201380055419 A CN201380055419 A CN 201380055419A CN 104736944 A CN104736944 A CN 104736944A
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- Prior art keywords
- aperture
- expansion valve
- temperature
- region
- setting
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Classifications
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0314—Temperature sensors near the indoor heat exchanger
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0315—Temperature sensors near the outdoor heat exchanger
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
In the present invention, an air conditioner that uses R32 refrigerant is equipped with opening degree control for an expansion valve that is capable of stably controlling the temperature of refrigerant discharged from a compressor. An air conditioner (10) is provided with: a refrigerant circuit (11) in which a compressor (12), an outdoor heat exchanger (14), an expansion valve (15), and an indoor heat exchanger (16) are connected and HFC32 circulates as a refrigerant; and a control unit (30) that performs opening degree control at each predetermined sampling time (t) in order to change the opening degree of the expansion valve (15) by a predetermined amount so that the discharge pipe temperature (Tp) of the compressor (12) becomes a target discharge pipe temperature (Tpa). The sampling time (t) is longer when the opening degree of the expansion valve (15) is in a range that is less than a predetermined value than when in a range that is equal to or greater than the predetermined value.
Description
Technical field
The present invention relates to a kind of R32 that uses as the air conditioner of cold-producing medium, particularly relate to the aperture control mode of expansion valve.
Background technology
Up to now, as the air conditioner possessed by allowing refrigerant circulation carry out the refrigerant loop of steam compression type refrigeration circulation, know there is following air conditioner, that is: the aperture controlling expansion valve controls the temperature of the ejection cold-producing medium of compressor, indirectly regulates the degree of superheat of the suction cold-producing medium of compressor thus.Such as shown in patent document 1, in this air conditioner, according to pre-set certain cycle, FEEDBACK CONTROL is carried out to the aperture of expansion valve.
In addition, in recent years, as shown in patent document 2, the less R32 of global warming potential GWP (HFC32) is used to be attracted attention as the air conditioner of cold-producing medium to alleviate on the impact of global warming.
Prior art document
Patent document
Patent document 1: day disclosure utility model publication Beneficial 3-34564 publication
Patent document 1: disclosure patent gazette Te Open 2012-122677 publication
Summary of the invention
The technical problem that invention will solve
But, have following problems, that is: use R32 as in the air conditioner of cold-producing medium, if carry out the aperture control of expansion valve by certain cycle as described above, in the low-load region of circulating mass of refrigerant minimizing, be so just difficult to the temperature of the ejection cold-producing medium stably controlling compressor.
Due in the middle of various cold-producing medium, R32 is the cold-producing medium that the refrigerating capacity of per unit volume is higher, therefore, it is possible to reduce circulating mass of refrigerant required in refrigerant loop, in low-load region, circulating mass of refrigerant just becomes less.Even if change the aperture of expansion valve in low-load region, also because circulating mass of refrigerant is considerably less, the temperature therefore spraying cold-producing medium can not reach target temperature at once.So, when upper once aperture controls, although the aperture of expansion valve has in fact been controlled to suitable aperture, the aperture of expansion valve still can have been changed further because of also having temperature difference between the temperature and target temperature of ejection cold-producing medium.Once the aperture continuing to carry out such expansion valve controls, so-called wave phenomenon will occur, and the temperature namely spraying cold-producing medium exceedes target temperature a little while lower than target temperature a little while, and this situation constantly repeatedly.Consequently, the temperature stably controlling to spray cold-producing medium is difficult to.
The present invention completes in view of the above problems, its object is to: at use R32 as in the air conditioner of cold-producing medium, construct a kind of aperture control mode of expansion valve, under this aperture control mode, stably can control the temperature of the ejection cold-producing medium of compressor.
In order to the technical scheme of technical solution problem
The invention of first aspect is for object with a kind of air conditioner, it possesses refrigerant loop 11 and control part 30, compressor 12, outdoor heat converter 14, expansion valve 15 and indoor heat converter 16 is connected with in this refrigerant loop 11, HFC32 circulates in this refrigerant loop 11 as cold-producing medium, thus this refrigerant loop 11 carries out kind of refrigeration cycle, the aperture that this control part 30 carries out the aperture of described expansion valve 15 to change ormal weight by specified period controls, and makes the temperature of the ejection cold-producing medium of described compressor 12 become target temperature.Be less than the described specified period in the such region of setting in the aperture of described expansion valve 15, the described specified period be more than or equal in the such region of described setting than the aperture at described expansion valve 15 is long.
In the invention of described first aspect, in the region that the aperture of expansion valve 15 is less, that is when the circulating mass of refrigerant in refrigerant loop 11 is less, the cycle that aperture controls can elongated, therefore spray cold-producing medium temperature can from change the aperture of expansion valve 15 play carry out on once till aperture control during in reach (close) target temperature.That is, ejection cold-producing medium temperature stabilization after just carry out on once aperture control.
The invention of second aspect is for object with a kind of air conditioner, it possesses refrigerant loop 11 and control part 30, compressor 12, outdoor heat converter 14, expansion valve 15 and indoor heat converter 16 is connected with in this refrigerant loop 11, HFC32 circulates in this refrigerant loop 11 as cold-producing medium, thus this refrigerant loop 11 carries out kind of refrigeration cycle, the aperture that this control part 30 carries out the aperture of described expansion valve 15 to change ormal weight by specified period controls, and makes the temperature of the ejection cold-producing medium of described compressor 12 become target temperature.Be less than the described ormal weight in the such region of setting in the aperture of described expansion valve 15, the described ormal weight be more than or equal in the such region of described setting than the aperture at described expansion valve 15 is little.
In the invention of described second aspect, due in the region that the aperture of expansion valve 15 is less, the knots modification of aperture can diminish, and the variable quantity therefore carrying out the temperature of the ejection cold-producing medium caused by an aperture control diminishes.Thus, the temperature of ejection cold-producing medium can not significantly rise or decline, and the temperature spraying cold-producing medium can be suppressed a little while to exceed target temperature and occur lower than the state of target temperature a little while.
The invention of the third aspect is on the basis of the invention of first aspect, have following characteristics: be less than the described ormal weight in the such region of described setting in the aperture of described expansion valve 15, the described ormal weight be more than or equal in the such region of described setting than the aperture at described expansion valve 15 is little.
In the invention of the described third aspect, due in the region that the aperture of expansion valve 15 is less, specified period can the elongated and knots modification of aperture can diminish, therefore the temperature spraying cold-producing medium easily on carrying out once aperture control before stabilisation, and carry out an aperture control caused by the variable quantity of temperature of ejection cold-producing medium diminish.Occur lower than the state of target temperature thereby, it is possible to reliably avoid the temperature spraying cold-producing medium to exceed target temperature a little while a little while.
The invention of fourth aspect be first or the third aspect invention basis on, have following characteristics: be less than in the such region of described setting in the aperture of described expansion valve 15, aperture is less, described specified period is just periodically longer.
In the invention of described fourth aspect, the aperture of expansion valve 15 is less, circulating mass of refrigerant in refrigerant loop 11 is fewer, the time that the temperature of ejection cold-producing medium reaches required for target temperature is longer, but because the less specified period of aperture is just periodically longer, therefore spray cold-producing medium temperature can reliably on carrying out once aperture reach target temperature before controlling.
The invention of the 5th aspect is on the basis of the invention of either side in the first to the four, there is following characteristics: described expansion valve 15 is such expansion valves, namely, when aperture is less than described setting, the variable quantity of relative with the variable quantity of the aperture of described expansion valve 15, in described expansion valve 15 refrigerant flow reduces.
In invention in the described 5th, be less than in the region of setting in the aperture of expansion valve 15, the amplitude of variation of refrigerant flow is so large not as the knots modification of aperture, and the amplitude of variation of the circulating mass of refrigerant therefore in refrigerant loop 11 is also little.Therefore, the temperature time reached needed for target temperature spraying cold-producing medium can become longer.But owing to being less than in the region of setting in aperture, specified period can diminish by knots modification that is elongated or aperture, occur lower than the state of target temperature therefore, it is possible to effectively avoid the temperature spraying cold-producing medium to exceed target temperature a little while a little while.
The effect of invention
As mentioned above, according to the present invention, accomplish that the cycle that the period ratio that the aperture be less than in the such region of setting in the aperture of expansion valve 15 is controlled controls in the aperture that the aperture of expansion valve 15 is more than or equal in the such region of setting is long, even when the circulating mass of refrigerant therefore in refrigerant loop 11 is less, also can from change the aperture of expansion valve 15 play carry out on once aperture control till during in, make the temperature of ejection cold-producing medium reach (close) target temperature.That is, can ejection cold-producing medium temperature stabilization after carry out again on once aperture control.Therefore, in upper aperture once controls, suitably can set the knots modification of aperture, so, the temperature spraying cold-producing medium can be avoided a little while to exceed target temperature and occur lower than the state of target temperature a little while.Consequently, the wave phenomenon of the temperature spraying cold-producing medium can be prevented, stably can control the temperature spraying cold-producing medium.
According to the invention of second aspect, accomplish that the knots modification making to be less than in the aperture of expansion valve 15 aperture in the such region of setting is less than the knots modification being more than or equal to the aperture in the such region of setting in the aperture of expansion valve 15, therefore, it is possible to circulating mass of refrigerant in refrigerant loop 11 is less, make to carry out an aperture control caused by the variable quantity of temperature of ejection cold-producing medium diminish.Thus, because the temperature of ejection cold-producing medium can not significantly rise or decline, occur lower than the state of target temperature therefore, it is possible to avoid the temperature spraying cold-producing medium to exceed target temperature a little while a little while.Consequently, the wave phenomenon of the temperature spraying cold-producing medium can be prevented, stably can control the temperature spraying cold-producing medium.
According to the invention of the third aspect, accomplish that the cycle that the period ratio that the aperture be less than in the such region of setting in the aperture of expansion valve 15 is controlled controls in the aperture that the aperture of expansion valve 15 is more than or equal in the such region of setting is long, and accomplish that the knots modification making to be less than in the aperture of expansion valve 15 aperture in the such region of setting is less than the knots modification being more than or equal to the aperture in the such region of setting in the aperture of expansion valve 15, occur lower than the state of target temperature therefore, it is possible to reliably avoid the temperature spraying cold-producing medium to exceed target temperature a little while a little while.Thereby, it is possible to reliably and stably control the temperature spraying cold-producing medium.
According to the invention of fourth aspect, accomplish to be less than in the such region of setting in the aperture of expansion valve 15, aperture is less, the phase of the cycles property just making aperture control longer, therefore, it is possible on carrying out once aperture control before reliably make the temperature of ejection cold-producing medium reach (close) target temperature.Thereby, it is possible to reliably and stably control the temperature spraying cold-producing medium.
According to the invention of the 5th aspect, be less than in the such region of setting in the aperture of expansion valve 15, the amplitude of variation of the circulating mass of refrigerant in refrigerant loop 11 does not allow the knots modification of aperture so large, and the temperature time reached needed for target temperature therefore spraying cold-producing medium can become longer.But, this region being less than setting owing to coordinating the aperture of expansion valve 15 is elongated or the knots modification of aperture is diminished to the cycle making aperture control, occurs therefore, it is possible to effectively avoid the temperature of ejection cold-producing medium to exceed target temperature a little while lower than the state of target temperature a little while.Therefore, it is possible to effectively prevent the wave phenomenon of the temperature spraying cold-producing medium.
Accompanying drawing explanation
Fig. 1 is for illustrating the piping diagram of the structure of the air conditioner involved by the first embodiment.
Fig. 2 is for illustrating the flow chart of the aperture control mode of the expansion valve involved by the first embodiment.
Fig. 3 is the table of the relation illustrated between the opening amount region of expansion valve and sample time.
Fig. 4 is the curve map of the relation illustrated between the aperture of expansion valve and refrigerant flow.
Fig. 5 is for illustrating the flow chart of the aperture control mode of the expansion valve involved by the second embodiment.
Fig. 6 is the table of the relation illustrated between the opening amount region of expansion valve and aperture knots modification.
Detailed description of the invention
Below, with reference to the accompanying drawings embodiments of the present invention are described in detail.It should be noted that, following embodiment is preferred example in essence, and the scope of intention to the present invention, its application or its purposes is not limited.
(the first embodiment)
First embodiment of the present invention is described.As shown in Figure 1, the air conditioner 10 of present embodiment possesses refrigerant loop 11, can switch and carries out cooling operation and heat running.In refrigerant loop 11, be connected with compressor 12, four-way change-over valve 13, outdoor heat converter 14, expansion valve 15, indoor heat converter 16, refrigerant loop 11 forms loop.Refrigerant loop 11 is configured to: in refrigerant loop 11, be filled with R32 (HFC32 (difluoromethane)), as cold-producing medium, carry out steam compression type refrigeration circulation by this refrigerant circulation.
In refrigerant loop 11,4th valve port of four-way change-over valve 13 is connected with the ejection passage of compressor 12, second valve port of four-way change-over valve 13 is connected with the intake line of compressor 12, first valve port of four-way change-over valve 13 is connected with the end of outdoor heat converter 14, and the 3rd valve port of four-way change-over valve 13 is connected with the end of indoor heat converter 16.Four-way change-over valve 13 is configured to be communicated with the 4th valve port at the first valve port and the first state (state represented with solid line in FIG) of being communicated with the 3rd valve port of the second valve port and the first valve port are communicated with the second valve port and switch between the second state (state be represented by dotted lines in FIG) of being communicated with the 4th valve port of the 3rd valve port.
In refrigerant loop 11, when four-way change-over valve 13 is switched to the first state, cold-producing medium just outdoor heat converter 14 as condenser working indoor heat converter 16 as the kind of refrigeration cycle of evaporator operation under circulate.In refrigerant loop 11, when four-way change-over valve 13 is switched to the second state, cold-producing medium just indoor heat converter 16 as condenser working outdoor heat converter 14 as evaporator operation heat circulation under circulate.That is, four-way change-over valve 13 is formed in refrigerant loop 11 switching mechanism that the loop direction of cold-producing medium switches.
Compressor 12 is the variable displacement compressors 12 that can be regulated operating frequency by DC conversion circuit.Expansion valve 15 is configured to utilize pulse motor to change aperture.Outdoor heat converter 14 is configured to cold-producing medium and outdoor air carries out heat exchange, and indoor heat converter 16 is configured to cold-producing medium and room air carries out heat exchange.
< sensor, control part >
In air conditioner 10, be provided with control part 30 and various sensor, control part 30 is used for controlling the operating frequency of compressor 12, the aperture of expansion valve 15.
As shown in Figure 1, in refrigerant loop 11, bleed pipe temperature sensor 21, outdoor heat converter temperature sensor 22, indoor heat converter temperature sensor 23 is provided with.The temperature (hereinafter referred to as bleed pipe temperature Tp) of the bleed pipe of bleed pipe temperature sensor 21 pairs of compressors 12 detects.Bleed pipe temperature Tp is equivalent to the temperature of the ejection cold-producing medium of compressor 12.The temperature of the cold-producing medium in outdoor heat converter temperature sensor 22 pairs of outdoor heat converters 14 detects, and the temperature of the cold-producing medium in indoor heat converter temperature sensor 23 pairs of indoor heat converters 16 detects.When cooling operation, the detected temperatures detected by outdoor heat converter temperature sensor 22 is equivalent to the condensation temperature Tc of cold-producing medium, and when heating running, the temperature detected by outdoor heat converter temperature sensor 22 is equivalent to the evaporating temperature Te of cold-producing medium.When cooling operation, the temperature detected by indoor heat converter temperature sensor 23 is equivalent to the evaporating temperature Te of cold-producing medium, and when heating running, the temperature detected by indoor heat converter temperature sensor 23 is equivalent to the condensation temperature Tc of cold-producing medium.
At cooling operation with when heating running, the aperture that control part 30 carries out expansion valve 15 by specified period (hereinafter referred to as sampling (sampling) time t) controls, and makes the bleed pipe temperature Tp of compressor 12 become target bleed pipe temperature Tpa.Control part 30 is configured to change sample time t according to the current opening amount region of expansion valve 15.Hereinafter the details that described aperture controls is described.
-working condition-
The working condition of air conditioner 10 is described.
When carrying out cooling operation, in refrigerant loop 11, four-way change-over valve 13 is switched to the first state.In cooling operation, the cold-producing medium that compressor 12 sprays is the condensation to outdoor air heat radiation in outdoor heat converter 27.Condensed cold-producing medium is decompression (expansion) when passing through expansion valve 15.Post-decompression cold-producing medium in indoor heat converter 16 indoor air heat absorption and evaporate, room air is cooled and feeds to indoor.Freezed in indoor thus.Cold-producing medium in indoor heat converter 16 after evaporation, again sprays after being compressed in compressor 12.
When carrying out heating running, in refrigerant loop 11, four-way change-over valve 13 is switched to the second state.Heating in running, the cold-producing medium that compressor 12 sprays is the condensation to room air heat radiation in indoor heat converter 16, and room air is heated.Thus indoor are heated.Condensed cold-producing medium is decompression (expansion) when passing through expansion valve 15.Post-decompression cold-producing medium in outdoor heat converter 14 outdoor air heat absorption and evaporate.Cold-producing medium after evaporation sprays after being compressed in compressor 12 again.
The working condition > of < control part
At cooling operation with when heating running, the aperture that control part 30 just carries out expansion valve 15 every the sample time t (second) of regulation controls, and makes the bleed pipe temperature Tp of compressor 12 become target bleed pipe temperature Tpa.Specifically, control part 30 carries out FEEDBACK CONTROL according to the flow chart shown in Fig. 2 to the aperture of expansion valve 15.
In step ST1, the sample time t that whether have passed through regulation is judged, if having passed through the sample time t of regulation, just transfer to step ST2 from last time driving expansion valve 15 (changing the aperture of expansion valve 15).
In step ST2, setting target bleed pipe temperature Tpa.In the present embodiment, target bleed pipe temperature Tpa is set to such value, i.e. the degree of superheat (namely as the degree of superheat of the outlet cold-producing medium of the heat exchanger 14,16 of evaporator operation) of the cold-producing medium of compressor 12 suction becomes the value of setting.That is, in the present embodiment, the degree of superheat of the cold-producing medium sucked indirectly is controlled by controlling bleed pipe temperature Tp.
Specifically, in control part 30, the temperature detected by outdoor heat converter temperature sensor 22 and condensation temperature Tc and the temperature detected by indoor heat converter temperature sensor 23 and evaporating temperature Te set target bleed pipe temperature Tpa.Such as, target bleed pipe temperature Tpa is tried to achieve by following computing formula.It should be noted that, α, β, γ in following are the coefficient of regulation.
Target bleed pipe temperature Tpa=α × condensation temperature Tc-β × evaporating temperature Te+ γ
By above-mentioned set target bleed pipe temperature Tpa like that after, transfer to step ST3.In step ST3, the current bleed pipe temperature Tp measured by bleed pipe temperature sensor 21 is input in control part 30.
In following step ST4, aperture knots modification Δ P (umber of pulse) of the expansion valve 15 in order to make the current bleed pipe temperature Tp of input become required for (close) target bleed pipe temperature Tpa is set.If the aperture of expansion valve 15 increases, as in the heat exchanger 14,16 of evaporator operation, circulating mass of refrigerant will increase, and the degree of superheat therefore exporting cold-producing medium can reduce, and consequently bleed pipe temperature Tp can reduce.If the aperture of expansion valve 15 reduces, as in the heat exchanger 14,16 of evaporator operation, circulating mass of refrigerant will reduce, and the degree of superheat therefore exporting cold-producing medium can rise, and consequently bleed pipe temperature Tp can rise.
Specifically, control part 30 has the table (fuzzy table (Fuzzytable)) for setting aperture knots modification Δ P in advance.In fuzzy table, the variable quantity according to the time per unit of the deviation between bleed pipe temperature Tp and target bleed pipe temperature Tpa and bleed pipe temperature Tp defines aperture knots modification Δ P.Therefore, control part 30 calculates above-mentioned deviation, and bleed pipe temperature Tp when controlling from last aperture and bleed pipe temperature Tp this time calculates the variable quantity of above-mentioned time per unit, sets aperture knots modification Δ P according to the deviation calculated and variable quantity.
After setting aperture knots modification Δ P, in step ST5, control part 30 drives expansion valve 15, makes the aperture of expansion valve 15 increase or reduce aperture knots modification Δ P.
In following step ST6, set new sample time t.That is, maintain or change sample time t.As shown in Figure 3, in the present embodiment, according to the opening amount region of expansion valve 15, sample time t is set as different values.In the present embodiment, as shown in Figure 4, the minimum aperture of expansion valve 15 is divided into three opening amount region (large opening amount region, middle opening amount region, small guide vane region) to this scope of maximum opening.Large opening amount region is the scope from the first setting Px to maximum opening, and middle opening amount region is from the second setting Py to the scope being less than the first setting Px, and small guide vane region is from minimum aperture to the scope being less than the second setting Py.
Then, in step ST6, when the aperture P of current expansion valve 15 is large opening amount region, sample time t is set to " ta (second) ", when the aperture P of current expansion valve 15 is middle opening amount region, sample time t is set to " tb (second) ", and when the aperture P of current expansion valve 15 is small guide vane region, sample time t is set to " tc (second) ".At this, the aperture P of above-mentioned current expansion valve 15 refers in step ST5 by the aperture of the expansion valve 15 of (the aperture P change after) after driving.The magnitude relationship of ta, tb, tc is ta < tb < tc.
As mentioned above, in the aperture control mode of the expansion valve 15 of present embodiment, be less than the sample time t in the such region of the first setting Px at the aperture P of expansion valve 15, the sample time t be more than or equal in the such region of the first setting Px than the aperture P at expansion valve 15 is long.And in the present embodiment, in the region being less than the first setting Px, the aperture P of expansion valve 15 is less, sample time t is just periodically longer.That is, in the present embodiment, the aperture P of expansion valve 15 is less, the sample time t that just setting is longer.
As shown in Figure 4, the expansion valve 15 of present embodiment has such characteristic, that is: when aperture P is less than the first setting Px, the variable quantity of relative with the variable quantity of aperture P, in expansion valve 15 refrigerant flow reduces.That is, in expansion valve 15, even if aperture P to be changed identical aperture knots modification Δ P in middle opening amount region and small guide vane region, all same little of the variable quantity of refrigerant flow.Furthermore, in the aperture control mode of the expansion valve 15 of present embodiment, the aperture that the relation in expansion valve 15 between aperture P and refrigerant flow changes is set as the first setting Px.
Once set new sample time t in step ST6, just get back to step ST1 and carry out aperture next time and control.That is, in step ST1, the sample time t that whether have passed through new settings is judged, if having passed through the sample time t of new settings, just transfer to the later step of step ST2 by same mode from driving expansion valve 15.
In the region (middle opening amount region, small guide vane region) that the aperture P of expansion valve 15 is less, the refrigerant flow in expansion valve 15 reduces, and the circulating mass of refrigerant in refrigerant loop 11 reduces.In the present embodiment, owing to using R32 as cold-producing medium, therefore in the region that the aperture P of expansion valve 15 is less, circulating mass of refrigerant becomes considerably less.In this opening amount region that circulating mass of refrigerant is less, even if change the aperture P of expansion valve 15, it is very slow that bleed pipe temperature Tp also rises or declines, and reaches target bleed pipe temperature Tpa quite expend time in from bleed pipe temperature Tp.In this case, if carry out aperture control with the sample time t that the region (large opening amount region) larger with the aperture P of expansion valve 15 is identical, although so the aperture P of expansion valve 15 has been controlled to suitable aperture in fact, control part 30 still can change the control of the aperture P of expansion valve 15 further because of also having temperature difference between bleed pipe temperature Tp and target bleed pipe temperature Tpa.That is, on bleed pipe temperature Tp has just carried out in the transitional period that target bleed pipe temperature Tpa changes, once aperture controls.Consequently, wave phenomenon can occur, namely bleed pipe temperature Tp exceedes target bleed pipe temperature Tpa a little while lower than target bleed pipe temperature Tpa a little while, and this situation constantly repeatedly.
Relative to this, the aperture control mode of expansion valve 15 according to the present embodiment, because the aperture P of expansion valve 15 is less, sample time, t was longer, therefore, it is possible to the aperture of just carrying out after making bleed pipe temperature Tp reach (close) target bleed pipe temperature Tpa next time controls changing the aperture P of expansion valve 15.That is, before aperture once controls on carrying out, bleed pipe temperature Tp can be made to reach (close) target bleed pipe temperature Tpa and bleed pipe temperature Tp stablized.
-effect of embodiment-
As mentioned above, according to the present embodiment, accomplished: the sample time t (cycle that aperture controls) that the aperture be less than in the such region of setting (the first setting Px) at the aperture P of expansion valve 15 is controlled, the sample time t (cycle that aperture controls) being more than or equal to the aperture control in the such region of setting (the first setting Px) than the aperture P at expansion valve 15 is long.Therefore, even when the circulating mass of refrigerant in refrigerant loop 11 is less, also can from change the aperture of expansion valve 15 play carry out on once aperture control till during in, make bleed pipe temperature Tp reach (close) target bleed pipe temperature Tpa.That is, can carry out again after bleed pipe temperature Tp is stable on once aperture control.Therefore, in upper aperture once controls, suitably can detect the deviation between bleed pipe temperature Tp and target bleed pipe temperature Tpa, suitably can set aperture knots modification Δ P thus.So, bleed pipe temperature Tp can be avoided to exceed target bleed pipe temperature Tpa occur lower than the state of target bleed pipe temperature Tpa a little while a little while.Consequently, the wave phenomenon of bleed pipe temperature Tp can be prevented, can stably control bleed pipe temperature Tp.
And, in the present embodiment, accomplish: in the opening amount region being less than the second setting Py also less than the first setting Px, make sample time t elongated further.That is, accomplished: be less than at the aperture P of expansion valve 15 in the region of setting (the first setting Px), aperture P is less, and the sample time t just making aperture control is periodically longer.For this reason, even if circulating mass of refrigerant is close to minimal circulation amount, also can on carrying out once aperture control before reliably make bleed pipe temperature Tp reach (close) target bleed pipe temperature Tpa.Therefore, it is possible to reliably and stably control bleed pipe temperature Tp.
Be less than in the region of setting (the first setting Px) at the aperture P of expansion valve 15, based on the characteristic of expansion valve 15, in refrigerant loop 11, the amplitude of variation of circulating mass of refrigerant is not as aperture knots modification Δ P so large (with reference to Fig. 4).Therefore, be less than in the region of setting (the first setting Px) at the aperture P of expansion valve 15, the time that bleed pipe temperature Tp reaches needed for (close) target bleed pipe temperature Tpa can become longer.In the aperture control mode of present embodiment, due to coordinate be less than setting (the first setting Px) this region and increase aperture control sample time t, occur lower than the state of target bleed pipe temperature Tpa therefore, it is possible to effectively avoid bleed pipe temperature Tp to exceed target bleed pipe temperature Tpa a little while a little while.Therefore, it is possible to effectively prevent the wave phenomenon of bleed pipe temperature Tp.
(the second embodiment)
Second embodiment of the present invention is described.Present embodiment changes the aperture control mode of the expansion valve 15 in the air conditioner 10 of described first embodiment.That is, in described first embodiment, accomplish to be less than in the region of setting at the aperture P of expansion valve 15 to make sample time t elongated, and in the present embodiment, accomplish to be less than in the region of setting at the aperture P of expansion valve 15, make sample time t keep certain, and aperture knots modification Δ P is diminished.
The aperture that control part 30 in present embodiment carries out expansion valve 15 according to the flow chart shown in Fig. 5 controls.The control action of step ST1 ~ step ST3 is identical with described first embodiment.
In step ST4, in the same manner as described first embodiment, aperture knots modification Δ P (umber of pulse) of the expansion valve 15 in order to make current bleed pipe temperature Tp become required for (close) target bleed pipe temperature Tpa is set.Control part 30 has fuzzy table in advance, and in fuzzy table, the variable quantity according to the time per unit of the deviation between bleed pipe temperature Tp and target bleed pipe temperature Tpa and bleed pipe temperature Tp defines aperture knots modification Δ P.
As shown in Figure 6, in the fuzzy table of present embodiment, aperture knots modification Δ P is set as different values by the opening amount region according to expansion valve 15.In the same manner as described first embodiment, the opening amount region of expansion valve 15 is divided into large opening amount region, middle opening amount region, these three regions, small guide vane region.In step ST4, when the aperture P of current expansion valve 15 is large opening amount region, aperture knots modification Δ P is set to " Δ Pa (umber of pulse) ", when the aperture P of current expansion valve 15 is middle opening amount region, aperture knots modification Δ P is set to " Δ Pb (umber of pulse) ", when the aperture P of current expansion valve 15 is small guide vane region, aperture knots modification Δ P is set to " Δ Pc (umber of pulse) ".The magnitude relationship of Δ Pa, Δ Pb, Δ Pc is Δ Pa > Δ Pb > Δ Pc.
As mentioned above, in the aperture control mode of the expansion valve 15 of present embodiment, be less than the aperture knots modification Δ P in the such region of the first setting Px at the aperture P of expansion valve 15, the aperture knots modification Δ P be more than or equal in the such region of the first setting Px than the aperture P at expansion valve 15 is little.And in the present embodiment, in the region being less than the first setting Px, the aperture P of expansion valve 15 is less, aperture knots modification Δ P is just periodically less.That is, in the present embodiment, the aperture P of expansion valve 15 is less, the aperture knots modification Δ P that just setting is less.Therefore, in the present embodiment, even if the variable quantity of the time per unit of the deviation between bleed pipe temperature Tp with target bleed pipe temperature Tpa and bleed pipe temperature Tp is identical, as long as the aperture P of expansion valve 15 is less, P is less for aperture knots modification Δ.
Set aperture knots modification Δ P in step ST4 after, in step ST5, control part 30 drives expansion valve 15, makes the aperture of expansion valve 15 increase or reduce aperture knots modification Δ P.Once drive expansion valve 15, just get back to step ST1 and carry out aperture next time and control.
The aperture control mode of the expansion valve 15 according to the present embodiment, accomplish: make the aperture knots modification Δ P be less than at the aperture P of expansion valve 15 in the such region of setting (the first setting Px), less than the aperture knots modification Δ P be more than or equal in the such region of setting (the first setting Px) at the aperture P of expansion valve 15, therefore, it is possible to circulating mass of refrigerant in refrigerant loop 11 is less, make to carry out an aperture control caused by the variable quantity of bleed pipe temperature Tp diminish.Thus, because bleed pipe temperature Tp can not significantly rise or decline, occur lower than the state of target bleed pipe temperature Tpa so bleed pipe temperature Tp can be avoided to exceed target bleed pipe temperature Tpa a little while a little while.Consequently, the wave phenomenon of bleed pipe temperature Tp can be prevented, can stably control bleed pipe temperature Tp.Other effect is identical with described first embodiment.
(other embodiment)
In the present invention, also the respective embodiments described above can be formed in the following manner.
Such as, in the aperture control mode involved by described first embodiment, also can be: make the aperture P of expansion valve 15 less, sample time, t was longer, but also as described in the second embodiment, make the aperture P of expansion valve 15 less, P is less for aperture knots modification Δ.So, can reliably avoid bleed pipe temperature Tp to exceed target bleed pipe temperature Tpa to occur lower than the state of target bleed pipe temperature Tpa a little while a little while.Therefore, it is possible to more stably control bleed pipe temperature Tp.
In described each embodiment, the opening amount region of expansion valve 15 is divided into three regions, but also can divide into two regions, or divide into the region of more than four.When dividing into two regions, consider the characteristic (relation between aperture and refrigerant flow) of expansion valve 15, preferably omit the second setting Py in the first setting Px and the second setting Py.
The air conditioner 10 of described each embodiment also can be the air conditioner that can only carry out cooling operation He heat a kind of running in running.
Industrial applicability
As mentioned above, the present invention is useful for following air conditioner, and this air conditioner possesses refrigerant loop, and the R32 as cold-producing medium circulates in this refrigerant loop, thus refrigerant loop carries out steam compression type refrigeration circulation.
Symbol description
10 air conditioners
11 refrigerant loops
12 compressors
14 outdoor heat converters
15 expansion valves
16 indoor heat converters
30 control parts
Claims (5)
1. an air conditioner, it possesses refrigerant loop (11) and control part (30), compressor (12) is connected with in this refrigerant loop (11), outdoor heat converter (14), expansion valve (15) and indoor heat converter (16), HFC32 circulates in this refrigerant loop (11) as cold-producing medium, thus this refrigerant loop (11) carries out kind of refrigeration cycle, the aperture that this control part (30) carries out the aperture of described expansion valve (15) to change ormal weight by specified period controls, the temperature of the ejection cold-producing medium of described compressor (12) is made to become target temperature, it is characterized in that:
Be less than the described specified period in the such region of setting in the aperture of described expansion valve (15), the described specified period be more than or equal in the such region of described setting than the aperture at described expansion valve (15) is long.
2. an air conditioner, it possesses refrigerant loop (11) and control part (30), compressor (12) is connected with in this refrigerant loop (11), outdoor heat converter (14), expansion valve (15) and indoor heat converter (16), HFC32 circulates in this refrigerant loop (11) as cold-producing medium, thus this refrigerant loop (11) carries out kind of refrigeration cycle, the aperture that this control part (30) carries out the aperture of described expansion valve (15) to change ormal weight by specified period controls, the temperature of the ejection cold-producing medium of described compressor (12) is made to become target temperature, it is characterized in that:
Be less than the described ormal weight in the such region of setting in the aperture of described expansion valve (15), the described ormal weight be more than or equal in the such region of described setting than the aperture at described expansion valve (15) is little.
3. air conditioner according to claim 1, is characterized in that:
Be less than the described ormal weight in the such region of described setting in the aperture of described expansion valve (15), the described ormal weight be more than or equal in the such region of described setting than the aperture at described expansion valve (15) is little.
4. the air conditioner according to claim 1 or 3, is characterized in that:
Be less than in the such region of described setting in the aperture of described expansion valve (15), aperture is less, and described specified period is just periodically longer.
5. the air conditioner according to any one of claim 1 to 4, is characterized in that:
Described expansion valve (15) is such expansion valve, that is: when aperture is less than described setting, the variable quantity of relative with the variable quantity of the aperture of described expansion valve (15), in described expansion valve (15) refrigerant flow reduces.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-239888 | 2012-10-31 | ||
| JP2012239888A JP5672290B2 (en) | 2012-10-31 | 2012-10-31 | Air conditioner |
| PCT/JP2013/004893 WO2014068821A1 (en) | 2012-10-31 | 2013-08-19 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104736944A true CN104736944A (en) | 2015-06-24 |
| CN104736944B CN104736944B (en) | 2016-08-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380055419.0A Active CN104736944B (en) | 2012-10-31 | 2013-08-19 | Air conditioner |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2918947B1 (en) |
| JP (1) | JP5672290B2 (en) |
| CN (1) | CN104736944B (en) |
| ES (1) | ES2660871T3 (en) |
| WO (1) | WO2014068821A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6512596B2 (en) * | 2015-03-30 | 2019-05-15 | オリオン機械株式会社 | Heating device |
| JP6566693B2 (en) * | 2015-04-03 | 2019-08-28 | 日立ジョンソンコントロールズ空調株式会社 | Refrigeration cycle equipment |
| JP2018071909A (en) * | 2016-10-31 | 2018-05-10 | 三菱重工サーマルシステムズ株式会社 | Refrigeration apparatus and refrigeration system |
| CN111356885B (en) * | 2017-11-22 | 2022-02-01 | 三菱电机株式会社 | Air conditioner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06265222A (en) * | 1993-03-11 | 1994-09-20 | Mitsubishi Heavy Ind Ltd | Expansion valve control device for air conditioner |
| JPH09236299A (en) * | 1996-02-29 | 1997-09-09 | Daikin Ind Ltd | Running control device for air conditioning apparatus |
| JP2001174075A (en) * | 1999-12-14 | 2001-06-29 | Daikin Ind Ltd | Refrigerating device |
| JP2002286301A (en) * | 2001-03-27 | 2002-10-03 | Hitachi Ltd | Refrigerating cycle |
| CN1386185A (en) * | 2000-07-26 | 2002-12-18 | 大金工业株式会社 | Air conditioner |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0334564U (en) | 1989-08-10 | 1991-04-04 | ||
| JP3988779B2 (en) * | 2005-09-09 | 2007-10-10 | ダイキン工業株式会社 | Refrigeration equipment |
| JP4596426B2 (en) * | 2005-09-21 | 2010-12-08 | 日立アプライアンス株式会社 | Heat source equipment |
| JP5618801B2 (en) | 2010-12-09 | 2014-11-05 | 三菱電機株式会社 | Air conditioner |
-
2012
- 2012-10-31 JP JP2012239888A patent/JP5672290B2/en active Active
-
2013
- 2013-08-19 WO PCT/JP2013/004893 patent/WO2014068821A1/en active Application Filing
- 2013-08-19 CN CN201380055419.0A patent/CN104736944B/en active Active
- 2013-08-19 ES ES13851368.4T patent/ES2660871T3/en active Active
- 2013-08-19 EP EP13851368.4A patent/EP2918947B1/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06265222A (en) * | 1993-03-11 | 1994-09-20 | Mitsubishi Heavy Ind Ltd | Expansion valve control device for air conditioner |
| JPH09236299A (en) * | 1996-02-29 | 1997-09-09 | Daikin Ind Ltd | Running control device for air conditioning apparatus |
| JP2001174075A (en) * | 1999-12-14 | 2001-06-29 | Daikin Ind Ltd | Refrigerating device |
| CN1386185A (en) * | 2000-07-26 | 2002-12-18 | 大金工业株式会社 | Air conditioner |
| JP2002286301A (en) * | 2001-03-27 | 2002-10-03 | Hitachi Ltd | Refrigerating cycle |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2918947A1 (en) | 2015-09-16 |
| CN104736944B (en) | 2016-08-10 |
| JP5672290B2 (en) | 2015-02-18 |
| EP2918947A4 (en) | 2016-09-21 |
| WO2014068821A1 (en) | 2014-05-08 |
| ES2660871T3 (en) | 2018-03-26 |
| EP2918947B1 (en) | 2018-01-03 |
| JP2014089006A (en) | 2014-05-15 |
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