CN103946652B - Refrigerating plant - Google Patents
Refrigerating plant Download PDFInfo
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- CN103946652B CN103946652B CN201180074883.5A CN201180074883A CN103946652B CN 103946652 B CN103946652 B CN 103946652B CN 201180074883 A CN201180074883 A CN 201180074883A CN 103946652 B CN103946652 B CN 103946652B
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- Prior art keywords
- oil
- compressor
- oil level
- housing
- refrigerating plant
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/06—Several compression cycles arranged in parallel
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/072—Intercoolers therefor
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/03—Oil level
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention provides the refrigerating plant that can realize the management of suitable oil mass.Refrigerating plant (1) have by carbon dioxide be used as cold-producing medium and carry out the refrigerant loop (10) of freeze cycle operating, this refrigerant loop (10) has: compressor (11), it is at housing (12) inner product trapped fuel, and is discharged to high pressure discharge pipe (21) together with cold-producing medium by this oil；Oil eliminator (22), it is located on high pressure discharge pipe (21)；And oil return pipe (28), it makes the oil separated by oil eliminator (22) return in housing (12), described refrigerating plant has: fuel level sensor (31), and it is used for detecting the oil level in compressor (11)；And display floater (51), it, according to the detection signal of this fuel level sensor (31), shows the oil condition in this compressor (11).
Description
Technical field
The present invention relates to a kind of refrigerating plant with oil return pipe, utilize this oil return pipe to make oil eliminator capture
Oil return in compressor.
Background technology
Typically, known in people, following a kind of refrigerating plant, has: multi-stag (such as 2 grades formulas) compressor,
It carries out multi-stage compression to the cold-producing medium sucked and discharges；Oil eliminator, it is located at the high pressure of this compressor
Go out on pipe；And oil return pipe, by its make the oil that this oil eliminator captures return compressor (referring for example to
Patent documentation 1).In this refrigerating plant, it is intermediate pressure or low pressure in compression case body, and in oil return
Electromagnetic opening and closing valve is set on pipe, when the oil mass in housing reduces to lower limit, by this electromagnetic opening and closing valve of opening and closing,
The differential pressure between discharging refrigerant (high pressure) and housing interior (intermediate pressure or low pressure) is utilized to make oil return shell
Internal.
Prior art Literature
Patent documentation
Patent documentation 1: Japanese invention Patent Publication No 2008-144643
Summary of the invention
The problem that invention is to be solved
But, during low on fuel in compression case body, owing to producing the compression key element that is contained in housing
Insufficient lubrication, so the oil mass management in housing is critically important.Thus, (comprise replacement fluorine using freon
Leon, also referred to as fluorocarbon series coolant) refrigerating plant in, in order to hold in compression case body
Oil mass, was provided with inspection window on housing in the past.
But, by carbon dioxide (CO2) be used as in the refrigerating plant of cold-producing medium, with use freon
Refrigerating plant is compared, and there are the following problems, i.e., owing to operating pressure is higher, thus is difficult at compressor
Inspection window is installed on housing, it is difficult to oil mass when filling oil after being configured fridge manages and services and inspection
Oil mass management when looking into.
The present invention makes in view of the above problems, its objective is to provide the freezing that can realize the management of suitable oil mass
Device.
The method of solution problem
In order to solve the problems referred to above, refrigerating plant of the present invention has carbon dioxide as cold-producing medium
Carrying out the refrigerant loop of freeze cycle operating, this refrigerant loop has: compressor, and it is in housing inner product
Trapped fuel, and this oil is discharged to high pressure discharge pipe together with cold-producing medium；Oil eliminator, it is located at described high pressure
On discharge pipe；And oil return pipe, it makes the oil separated by described oil eliminator return in described housing, described
Refrigerating plant is characterised by, has: oil level detection unit, and it is for detecting the oil level in described compressor；
And display unit, it, according to the detection signal of this oil level detection unit, shows the oil level shape in this compressor
State.
Using this structure, owing to having: oil level detection unit, it is for detecting the oil level in compressor；With
And display unit, it, according to the detection signal of this oil level detection unit, shows the oil condition in this compressor.
Thus, even for by carbon dioxide be used as cold-producing medium compressor, in also easily differentiating compressor
Oil level, can realize the management of suitable oil mass.
In the structure shown here, it is also possible to be, the structure of described display unit is 7 having and being configured to substantially 8-shaped
Individual light-emitting diodes tube segment, described refrigerating plant has display control unit, this display control unit make based on
The oil level of the detection signal of described oil level detection unit and the turned-on position of light-emitting diodes tube segment are the most corresponding
And show.
Furthermore it is also possible to be, the structure of described oil level detection unit for upper limit and lower limit can be detected,
Described display control unit controls as follows: when oil level is less than lower limit, light in light-emitting diodes tube segment
The sections of lowermost position, when oil level exceedes lower limit and is less than upper limit, lights in light-emitting diodes tube segment
The sections of middle section position, when oil level exceedes upper limit, lights the joint of uppermost position in light-emitting diodes tube segment
Section.
Invention effect
Use the present invention, even for by carbon dioxide be used as cold-producing medium compressor, also can easily differentiate
Oil level in compressor, can realize the management of suitable oil mass.
Accompanying drawing explanation
Fig. 1 is the loop structure figure representing the refrigerating plant described in present embodiment.
Fig. 2 is the skeleton diagram of the duty representing fuel level sensor, and A represents that oil level exceedes the shape of upper limit
State, B represents that oil level exceedes lower limit and the state less than upper limit, and C represents that oil level is less than the state of lower limit.
Fig. 3 is the explanatory diagram of the structure representing display floater.
Fig. 4 is the flow chart representing oil return control action.
Fig. 5 is the explanatory diagram of the display mode representing display floater, and A represents that oil level is less than the state of lower limit,
B represents that oil level exceedes lower limit and the state less than upper limit, and C represents that oil level exceedes the state of upper limit.
Fig. 6 is to represent the flow chart that operating stops control action.
Detailed description of the invention
One embodiment of the present invention is described with reference to the accompanying drawings.
Fig. 1 is the loop structure figure representing the refrigerating plant described in present embodiment.
Refrigerating plant 1 has fridge unit 3 and multiple stage (such as 2) showcase unit 5A, 5B, this
A little fridge unit 3 and each showcase unit 5A, 5B are joined by liquid refrigerant pipe arrangement 7 and gaseous refrigerant
Pipe 9 links and constitutes the refrigerant loop 10 that carries out freeze cycle operating.
The high-pressure side of this refrigerant loop 10 uses the carbon dioxide (CO in supercritical pressure2) cold-producing medium.
Due to the ozone destruction coefficient of carbon dioxide coolant be 0 and global warming coefficient is 1, thus to environment
Bear less, nontoxic and not there is combustibility, safe and cheap.It addition, except carbon dioxide
Beyond cold-producing medium, the compressor 11 being additionally added in refrigerant piping in lubricating refrigerant loop 10
Oil.In FIG, solid arrow represents the flowing of cold-producing medium, and dotted arrow represents the flowing of oil.
Fridge unit 3 has 2 compressors 11 connected side by side with pipe arrangement.This 2 compressor 11 is
Each interior bosom pressure-type rotary type two-stage compressor in intermediate pressure of housing 12.Each compressor 11
The inside of housing 12 be configured with motor part (omitting diagram) and the rudimentary compression driven by this motor part
Key element 11A, advanced compression key element 11B.Rudimentary compression key element 11A will be inhaled by gaseous refrigerant pipe arrangement 9
The low pressure refrigerant entering compressor 11 boosts to intermediate pressure and discharges, and advanced compression key element 11B will be above-mentioned
The cold-producing medium of the intermediate pressure of rudimentary compression key element 11A compression boosts to high pressure further and discharges.It addition,
Compressor 11 is Variable frequency type frequency compressor, just can adjust rudimentary pressure by changing the operating frequency of motor part
Contracting key element 11A and the rotating speed of advanced compression key element 11B.
The rudimentary side suction ports 12A connected with rudimentary compression key element 11A it is formed with on the housing 12 of compressor 11
The senior side suction ports 12C with rudimentary side outlet 12B and connected with advanced compression key element 11B and height
Level side outlet 12D.It is connected to low pressure on the respective rudimentary side suction ports 12A of each compressor 11 inhale
Entering pipe 13, the two low pressure suction tube 13 converges at the upstream side of two rudimentary compression key elements 11A, passes through
Single gas receiver 14 is connected with single gaseous refrigerant pipe arrangement 9.It addition, low pressure suction tube 13 is provided with suction
Entering pressure transducer 15 and inlet temperature sensor 16, they are respectively used to detection at this low pressure suction tube 13
The suction pressure of the cold-producing medium of middle flowing and inlet temperature.
It is connected to intermediate pressure discharge pipe 17, these two intermediate pressure rows in outlet 12B of each rudimentary side
Go out pipe 17 converge in the downstream of two rudimentary compression key elements 11A and be connected between one end of cooler 18.
The cold-producing medium of the intermediate pressure that this intercooler 18 is discharged from rudimentary compression key element 11A for cooling, in this
Between cooler 18 the other end connect have intermediate pressure suction tube 19, this intermediate pressure suction tube 19 bifurcated is
Respectively it is connected with senior side suction ports 12C after 2.It addition, intermediate pressure suction tube 19 is provided with intermediate pressure
Pressure transducer 20, for detection intermediate pressure of the cold-producing medium of flowing in this intermediate pressure suction tube 19.
In the structure shown here, senior side suction ports 12C is connected with advanced compression key element 11B by space in housing 12,
In compressor 11 operating, in this housing 12, keep intermediate pressure.
It is connected to high pressure discharge pipe 21, these two high pressure discharge pipes 21 in outlet 12D of each senior side
Merge in the downstream of two advanced compression key elements 11B as single high pressure discharge pipe 21A.High pressure is discharged
Pipe 21A is by single oil eliminator 22, gas cooler (radiator) 23 and supercooling heat exchanger 24
It is connected with liquid refrigerant pipe arrangement 7.It addition, be each provided with discharge pressure in two senior side outlets 12D
Sensor 25 and discharge temperature sensor 26, they are respectively used to detection from two advanced compression key elements 11B
The discharge pressure of the cold-producing medium discharged and discharge temperature.
Oil eliminator 22 is for separating the oil from the discharging refrigerant of the high pressure of compressor 11 discharge and refrigeration
Oil is also caught by agent, this oil eliminator 22 connects and has for making the oil captured return compressor 11
Oil return pipe 28.This oil return pipe 28 is provided with the oil cooler 27 of the oil captured for cooling, at this oil
The downstream of cooler 27, oil return pipe 28 bifurcated is oil return pipe (the returning of each compressor 11 of 2 systems
Oil pipe) 28A, they are connected to compressor by the electrodynamic valve 30 such as filter 29 and flow rate regulating valve respectively
On the housing 12 of 11.Intermediate pressure, institute can be remained in being as noted previously, as the housing 12 of compressor 11
With the oil that captures because of the high pressure (identical with the pressure in high pressure discharge pipe 21A) in oil eliminator 22 and shell
The differential pressure between intermediate pressure in body 12 and return in this housing 12.
But, this refrigerating plant 1 due to use carbon dioxide coolant, so with use fluorocarbon system
It is higher that the situation of cold-producing medium compares operating pressure, guarantees the needs of compressive resistance, oil eliminator 22 out of need
Volume be restricted.This can cause the separating of oil efficiency of oil eliminator 22 to decline, and the oil failing to separate flows to
It is positioned at the vaporizer (housing heat exchanger 43A, 43B) of the low-pressure side of freeze cycle and is trapped in vaporizer,
Cause heat conductivility to decline and compressor lubrication is bad.It addition, isolated oil can not be made to accumulate in fully
In oil eliminator 22, cold-producing medium is mixed in the oil that compressor 11 returns, and causes the efficiency of refrigerating plant 1
It is decreased obviously, or causes insufficient lubrication because returning the low on fuel of compressor 11.
To this, in the present embodiment, arrange have specified volume for accumulate oil eliminator 22 separate
The single fuel tank 61 of oil, makes the oil accumulating in this fuel tank 61 return two pressures by two oil return pipe 28A
In the housing 12 of contracting machine 11.
This fuel tank 61 is formed by small-sized (little volume) heatproof container that aspect ratio oil eliminator 22 is the lowest, tool
There are enough compressive resistances of the relatively high workload pressure that can bear this refrigerating plant 1, adjacent with oil eliminator 22
Arrange.
For connecting the end in oil eliminator 22, one end of the oily pipe arrangement 28B of oil eliminator 22 and fuel tank 61
Opening near portion, by above-mentioned differential pressure by near-bottom oil introduce oil pipe arrangement 28B in and introduce in fuel tank 61.
Connect on this fuel tank 61 and have the one end of the single oil return pipe 28 being connected with two compressors 11, in fuel tank 61
Oil be inhaled into oil return pipe 28 because of above-mentioned differential pressure in and return in the housing 12 of two compressors 11.
Using this structure, the oil that oil eliminator 22 separates is because of the negative pressure in the housing 12 of two compressors 11
Flow into and accumulate in fuel tank 61, can correspondingly reduce the pasta in oil eliminator 22.Thus, not only
Can ensure that bigger oil separation space (for separating the space of oil from the mixed flow of gaseous refrigerant and mist of oil)
And improve separating of oil efficiency, moreover it is possible to there are enough oil masses in guaranteeing fuel tank 61.
The housing 12 of compressor 11 is provided with fuel level sensor (oil level detection unit) 31, is used for detecting long-pending
There is the oil level (oil mass) in this housing 12.
Fuel level sensor 31 is the 2 contact level transducers that can detect upper limit and lower limit, such as Fig. 2 A～
Shown in Fig. 2 C, there is the sensor housing 131 connected with housing 12, the oil level in this sensor housing 131
Oil level variation in housing 12 according to compressor 11.It addition, be configured with in sensor housing 131: floating
Son 132, it fluctuates corresponding to the variation of oil level；And switch 135, it has according to described
The variation of the height and position of float 132 and the upper contact 133 of opening and closing and lower contact 134.At this switch
In 135, distributed magnet on float 132, it is arranged in upper contact 133 and the lower contact 134 of differing heights
According to the magnetic force of this Magnet and opening and closing.
Specifically, as shown in Figure 2 A, when the oil level in housing 12 exceedes upper limit, upper contact 133 is connected,
As shown in Figure 2 B, disconnect less than upper contact 133 during this upper limit.It addition, the oil level in housing 12 exceedes
During lower limit, lower contact disconnects, as shown in Figure 2 C, less than this lower limit contacting at present.
The discharging refrigerant of the high pressure that gas cooler 23 is discharged from compressor 11 for cooling, in this structure
In, gas cooler 23 is arranged side by side with above-mentioned intercooler 18 and oil cooler 27.These gases are cold
But, on device 23, intercooler 18 and oil cooler 27, adjacent it is provided with to this gas cooler 23, middle
Cooler 18 and the cooling fan 32 of oil cooler 27 air-supply.
Cold-producing medium is cooled down by gas cooler 23, and from gas cooler 23 by high pressure discharge pipe 21A
The first expansion valve (first throttle list that showcase unit 5A, 5B are had is flowed to liquid refrigerant pipe arrangement 7
Unit) 42A, 42B, supercooling heat exchanger 24 utilize this gas cooler 23 outlet side bifurcated point
Fork cold-producing medium carries out supercooling to above-mentioned cold-producing medium.At the outlet side of gas cooler 23 by high pressure discharge pipe 21
The bifurcated pipe arrangement 33 of bifurcated, by the second expansion valve 34, is connected to above-mentioned supercooling heat exchanger 24
On bifurcated refrigerant flow path entrance, the outlet of bifurcated refrigerant flow path is connected between the outlet side of cooler 18
On intermediate pressure suction tube 19.It addition, high pressure discharge pipe 21 is provided with inlet temperature sensor 35 and outlet
Temperature sensor 36, they are respectively used to the refrigerant temperature of detection flowing in high pressure discharge pipe 21 and are positioned at
The entrance side of supercooling heat exchanger 24 and outlet side.
It addition, fridge unit 3 has the main control unit 50 of the molar behavior for controlling refrigerating plant 1.
Main control unit 50 adjusts two compressors 11 not only according to the freezing load of showcase unit 5A, 5B
Operating frequency, always according to the cold-producing medium of advanced compression key element 11B detected by discharge temperature sensor 26
Discharge temperature adjusts the aperture of the second expansion valve 34.Further, it is also possible to according to as supercooling heat exchanger 24
The outlet temperature of bifurcated cold-producing medium of intermediate pressure, the gateway temperature of cold-producing medium of supercooling heat exchanger 24
Difference etc. adjusts the aperture of described second expansion valve 34.
It addition, main control unit 50 performs to control from oil eliminator 22 to the oil return of each compressor 11, perform
When this oil return controls, adjust the valve opening of each electrodynamic valve 30 according to the operating frequency of each compressor 11.This
Outward, when performing oil return control, valve opening is revised according to the oil level that each fuel level sensor 31 detects.At this
In embodiment, the operating frequency that main control unit 50 not only acts as according to two compressors 11 adjusts two
The effect of the valve opening adjustment unit of the valve opening of individual electrodynamic valve 30, also acts as and revises valve opening according to oil level
The effect of valve opening amending unit.
Further, main control unit 50 has in the detection signal according to fuel level sensor 31 shows housing 12
The display floater (display unit) 51 of oil level.This display floater 51 is located at the front table of main control unit 50
Face, maintains this main control unit 50 and can see this display floater 51 during Inspection.
Showcase unit 5A, 5B are separately positioned in shop, are connected to liquid refrigerant pipe arrangement the most side by side
7 and gaseous state refrigerant piping 9 on, each showcase unit 5A, 5B have for connecting liquid refrigerant pipe arrangement
7 and housing refrigerant piping 40A, 40B of gaseous state refrigerant piping 9, these housings refrigerant piping 40A,
Filter 41A and 41B, the first expansion valve (first throttle unit) 42A and 42B it is respectively equipped with on 40B
And housing heat exchanger 43A and 43B.On described housing heat exchanger 43A, 43B, adjacent be provided with to
Housing fan 44A, 44B of this housing heat exchanger 43A, 43B air-supply.
Move it addition, showcase unit 5A, 5B have each portion for controlling this showcase unit 5A, 5B
Shell member control apparatus 45A, the 45B made, this shell member control apparatus 45A, 45B can be with main control units 50
Communicate.Shell member control apparatus 45A, 45B are according to the gateway temperature difference of housing heat exchanger 43A, 43B
(degree of superheat) adjusts the aperture of first expansion valve 42A, 42B respectively.
Next explanation display floater 51.
It is arranged in can show 4 as it is shown on figure 3, the structure of this display floater 51 is 4 groups of display elements 52
Numeral, this display element 52 be 7 light-emitting diodes tube segment are configured to substantially 8-shaped and constitute.Specifically
Say, in 4 groups of display elements 52,2 groups of left side display element 52 is corresponding to side's compressor (the first compression
Machine) 11 and configure, 2 groups of right side display element 52 is corresponding to the opposing party's compressor (the second compressor) 11
And configure.
It is (following that display element 52 has 3 the light-emitting diodes tube segment making height and position different and horizontal-extending
Referred to as sections) SG1～SG3, at the sections SG1 corresponding to lowermost position of the edge of display floater 51
Height and position, print or be carved with the printed words of oil level " low ".Equally, corresponding to the sections SG2 of middle section position
Height and position, print or be carved with oil level " in " printed words, corresponding to the sections SG3 of uppermost position
Height and position, prints or is carved with the printed words of oil level " high ".
So, in the present embodiment, by make the turned-on position of light-emitting diodes tube segment in display element 52,
Mutually corresponding with the oil level of detection signal based on fuel level sensor 31 and show, user by vision with regard to energy
Hold the oil level in each compressor 11.Now, main control unit 50 plays and makes oil level and light-emitting diodes tube coupling
The function of the display control unit that the turned-on position of section is mutually corresponding and shows.
Next above-mentioned oil return control action is described.Fig. 4 is the flow chart representing oil return control action.Additionally,
Owing to the described oil return of two compressors 11 controls identical, so only illustrating that the compressor 11 of a side is with relative
The electrodynamic valve 30 answered.
After refrigerating plant 1 starts running, main control unit 50 obtains the initial opening (step of electrodynamic valve 30
S1).The valve opening set when this initial opening is refrigerating plant 1 (i.e. two compressors 11) operation starts thereafter,
In the present embodiment, the valve opening (such as 30 pulse) making electrodynamic valve 30 substantially in closed mode it is set as.
It follows that main control unit 50 adjusts electrodynamic valve 30 according to the operating frequency of compressor 11 respectively
Valve opening (step S2).This valve opening according to the operating frequency of compressor 11 and suitably can change according to oil level
Correction factor A obtain.Specifically, correlation f (x) being variable x by utilization with operating frequency
And the value obtained is multiplied with correction factor A and obtains valve opening, during operating frequency height, increase valve opening, operating
Valve opening is reduced when frequency is low.
Refrigerating plant 1 starts and after compressor 11 starts running, correction factor A is set by main control unit 50
It is set to initial value (A=2.0) (step S3), and utilizes this value to adjust valve opening.Thus, at refrigerating plant 1
After starting, the valve opening of electrodynamic valve 30 can be adjusted according to the operating frequency of compressor 11.Thus can basis
The operating frequency of each compressor 11 adjusts the valve opening of each electrodynamic valve 30, with of the prior art with electronic
Open and close valve adjusts the structure of recirculating oil quantity and compares, can according to the situation of compressor 11 trickle adjustment recirculating oil quantity.
Here, the initial value of correction factor A is set as obtaining the oil mass being equivalent to discharge from compressor 11
The value of valve opening of recirculating oil quantity, such as can set according to the specification of compressor 11.Thus, can improve from
Balance between oil mass that each compressor 11 is discharged and the oil mass in returning each housing 12 of each compressor 11,
The recirculating oil quantity that can make each compressor of return 11 becomes suitable.
It follows that main control unit 50 reset built-in timer after (step S4), it determines two compressors
Whether the lower contact of the switch of 11 disconnects (step S5).
In this differentiation, if the lower contact of switch is not off (step S5: no), i.e. oil level
During less than lower limit, it determines whether have passed through the first waiting time set in advance (is 30 in present embodiment
Second) (step S6), without through waiting time (step S6: no), return the process of step S5.
Have passed through waiting time by judging whether, be avoided that the pasta variation because producing during compressor operation
And the oil level flase drop caused.It addition, through waiting time (step S6: yes), i.e. oil level continues to be less than
During lower limit, owing to the oil mass being judged as in housing 12 is very few, so process is moved to by main control unit 50
Step S12 and revise the valve opening of electrodynamic valve 30.
It addition, as shown in Figure 5A, when oil level is less than lower limit, display floater only lighted by main control unit 50
The sections SG1 of the lowermost position of display element 52 in 51.
Returning again to Fig. 4, if the lower contact of switch is off (step S5: yes), i.e. oil level surpasses
When crossing lower limit, after main control unit 50 resets built-in timer (step S7), it determines switch
Whether upper contact disconnects (step S8).
In the differentiation of step S8, if the upper contact of switch is not off (step S5: no),
When i.e. oil level exceedes upper limit, it determines whether have passed through the second waiting time (present embodiment set in advance
In be 30 seconds) (step S9), without through waiting time (step S9: no), return step
The process of S8.Thus, as above-mentioned situation, oil level flase drop can not only be avoided, and through waiting
During the time, when i.e. oil level continues to exceed upper limit, owing to the oil mass being judged as in housing 12 is too much, thus main
Control device 50 process to be moved to step S15 and revises the valve opening of electrodynamic valve 30.
Here, as shown in Figure 5 B, when oil level exceedes lower limit and is less than upper limit, main control unit 50 makes
In display floater 51, the sections SG1 of the lowermost position of the display element 52 and sections SG2 of middle section position is complete
Portion lights.It addition, as shown in Figure 5 C, when oil level exceedes upper limit, main control unit 50 makes display floater
The sections SG1 of the lowermost position of display element 52, the sections SG2 of middle section position and uppermost position in 51
The sections SG3 put all lights.
So, in this structure, owing to having, 7 light-emitting diodes tube segment are configured to substantially 8-shaped and structure
The display element 52 become, makes the turned-on position of sections in this display element 52 and based on fuel level sensor 31
The oil level of detection signal is mutually corresponding and shows, thus such as in order to maintain and check, operates main control
The operator of device 50 or user, even for by carbon dioxide be used as cold-producing medium compressor 11, also can
Easily differentiate the oil level in compressor 11, the management of suitable oil mass can be realized.
Further, in Fig. 5 B and Fig. 5 C, illustrate the first compressor and the second compressor for convenience of description
The display mode that changes equally of oil level, but it is of course possible to be that the oil level of each compressor 11 suitably changes and shows
Show respective display mode.
It addition, in the present embodiment, 4 display elements 52 configure laterally side by side, as shown in Figure 5 D,
If being substantially the upper contact of fuel level sensor 31 and time lower contact such as is also turned at the flase drop, compare each compressor
The oil level of 11 shows, main control unit 50 preferentially shows error message.In figure 5d, sense as oil level
The exception of device 31 encodes and shows " E851 "." E85 " of this abnormal coding represents that fuel level sensor 31 is different
Often, ensuing " 1 " numbering representing compressor 11.
So, when generally operating, display floater 51 shows the oil level of compressor 11, additionally at oil
When level sensor 31 produces abnormal, compare oil level and show, preferentially show error coded, thus can be early to work
Industry person or user prompting create abnormal and rapidly this mistake can be carried out correspondence.
Further, in the present embodiment, the mistake that fuel level sensor 31 detects is illustrated as error coded
False information, but it is not limited to this, naturally it is also possible to show the abnormal conditions about other equipment.
Returning again to Fig. 4, if the upper contact of switch is off (step S8: yes), i.e. oil level is low
When upper limit, main control unit 50 differentiates whether two compressors 11 stop (step S10).Sentence at this
In not, if compressor 11 does not stop (step S10: no), process is moved to step S4, repeatedly holds
Oil level determination processing shown in row above-mentioned steps S4～S10.
If it addition, compressor 11 is stopping (step S10: yes), the valve opening of electrodynamic valve 30 is set
Terminate for initial opening to process (step S11).
If as it has been described above, when the state that is not off of the lower contact of switch continues (step S6: no),
Oil mass owing to being judged as in housing 12 is very few, so carrying out making to be located at the oil return pipe to this housing 12 oil return
The correction that the valve opening of the electrodynamic valve 30 on 28A expands.Specifically, main control unit 50 will be about pressure
The correction factor A of the valve opening of the electrodynamic valve 30 of contracting machine 11 is set as increasing ormal weight (in present embodiment
It is 10%) (step S12).Thus, the valve of the electrodynamic valve 30 adjusted according to the operating frequency of compressor 11
Aperture, is corrected for expanding according to the oil mass in housing 12.Thus the oil returned in housing 12 can be increased
Amount, and the state that the oil mass in this housing 12 is very few can be eliminated early.
It addition, main control unit 50 differentiates that whether correction factor A is more than the higher limit (present embodiment specified
In be 6.0) (step S13).This higher limit is to increase higher limit during correction factor A, if correction factor
A is less than higher limit (step S13: no), makes to the processing returns to step S4.
On the contrary, if correction factor A exceedes higher limit (step S13: yes), correction factor A is set
It is set to higher limit (step S14), makes to the processing returns to step S4.
If when the state that the upper contact of switch is not off continues (step S9: no), owing to being judged as
Oil mass in housing 12 is too much, so carrying out the correction making the valve opening of electrodynamic valve 30 reduce.Specifically,
The correction factor A of the valve opening of the electrodynamic valve 30 about compressor 11 is set as reducing by main control unit 50
Ormal weight (being about 5% in present embodiment) (step S15).Thus, according to the operating frequency of compressor 11
And the valve opening of the electrodynamic valve 30 adjusted, it is corrected for reducing according to the oil mass in housing 12.Thus energy
Reduce the oil mass returned in housing 12, and the state that the oil mass in this housing 12 is too much can be eliminated early.
It follows that main control unit 50 differentiates that whether correction factor A is less than lower limit (this embodiment party specified
Formula is 0.3) (step S16).Lower limit when this lower limit is to reduce correction factor A, if revising system
Number A (step S16: no) more than lower limit, makes to the processing returns to step S4.
On the contrary, if correction factor A is less than lower limit (step S16: yes), correction factor A is set
It is set to lower limit (step S17), makes to the processing returns to step S4.
Fig. 6 is to represent the flow chart that operating stops control action.After refrigerating plant 1 begins to cool down operating,
Carry out described flow process by the interrupt cycle of regulation, control parallel practice with the oil return shown in Fig. 4.Additionally, should
It is also that two compressors 11 are equally implemented that operating stops controlling.
First, after main control unit 50 resets another built-in timer (step S21), it determines compressor
Whether the lower contact of the switch of 11 disconnects (step S22).
In this differentiation, if the lower contact of switch is not off (step S22: no), i.e. oil level
During less than lower limit, it determines whether have passed through waiting time (operating stops judging with the waiting time) (step
S23), by waiting time can judge above-mentioned oil return control in oil mass do not increase state, i.e. cannot be avoided oil
Not enough state.Above-mentioned first and second waiting time (these embodiment party that waiting time controls than oil return
Formula is 30 seconds) the longest, in being set as not bringing the bigger dysgenic time to compressor 11, this
Embodiment is set as 10 minutes.
Without through waiting time (step S23: no), main control unit 50 returns to the place of step S22
Reason.Through waiting time (step S23: yes), stop oil level in continuing the state less than lower limit
The operating (step S24) of compressor 11, returns the process of step S22.Thus, compressor 11 it is avoided that
Operate under the less state of oil mass.
On the contrary, if the lower contact of switch is off (step S22: yes), under i.e. oil level exceedes
Time spacing, main control unit 50 differentiates whether the compressor 11 being provided with this switch is (step in stopping
S25), if not in stopping (step S25: no), the process of step S21 is returned.
Compressor 11 is for time in stopping (step S25: yes), and main control unit 50 has discriminated whether for referring to
Show the CRANK PULSES of operating, i.e. differentiate that operating indicates whether in continuation or with or without new operating instruction (step
S26).If there being operating instruction (step S26: yes), main control unit 50 makes compressor 11 again operate
(step S27).That is, after compressor 11 operating stops, when oil level exceedes lower limit, compressor is again made
11 start running.
On the contrary, without operating instruction (step S26: no), main control unit 50 terminates this process,
Compressor 11 is made to keep halted state.Thus, continue to avoid compressor 11 to transport under the less state of oil mass
Turn.
During here, made compressor 11 stop by the process of step S24, for compensating because of this compressor 11
Shut down and the running ability that causes declines, main control unit 50 carries out increasing other compressors 11
The control of running ability.Specifically, if during other compressors 11 are for stopping, then making other compressors 11
Start running, carry out the control making it with the ability operating before the stopping of the compressor 11 stopped, if other
Compressor 11 is in operating, then improving the running ability of other compressors 11, and raising amount is the compression stopped
The machine 11 running ability before stopping.Thus, running ability can be suppressed to decline, proceed corresponding to outside
The freezing operating of load (freezing load).
As described above, in the present embodiment, refrigerating plant 1 has carbon dioxide as refrigeration
Agent and carry out the refrigerant loop 10 of freeze cycle operating, this refrigerant loop 10 has: compressor 11,
It is at housing 12 inner product trapped fuel, and is discharged to high pressure discharge pipe 21 together with cold-producing medium by this oil；Separating of oil
Device 22, it is located on high pressure discharge pipe 21；And oil return pipe 28, its oil making oil eliminator 22 separate returns
Returning in housing 12, refrigerating plant 1 has: fuel level sensor 31, and it is for detecting in this compressor 11
Oil level；And display floater 51, it, according to the detection signal of this fuel level sensor 31, shows this compressor
Oil condition in 11.Thus without arranging inspection window on the compressor 11 higher in operating pressure, even if right
In by carbon dioxide be used as cold-producing medium compressor, also can easily differentiate the oil level in compressor, can realize
Suitably oil mass management.
Use present embodiment, owing to the structure of display floater 51 is 7 having and being configured to substantially 8-shaped
The display element 52 that light-emitting diodes tube segment is constituted, main control unit 50 makes inspection based on fuel level sensor 31
Survey the oil level of signal and the turned-on position mutually correspondence of light-emitting diodes tube segment and show, thus, for example,
Maintaining and check, the operator of operation main control unit 50 or user, even for by titanium dioxide
Carbon is used as the compressor 11 of cold-producing medium, also can easily differentiate the oil level in compressor 11, can realize suitably
Oil mass manages.
It addition, employing present embodiment, owing to the structure of fuel level sensor is for can detect upper limit and lower limit
Position, main control unit 50 is carried out as follows control, i.e. when oil level is less than lower limit, light light-emitting diodes tube coupling
The sections SG1 of lowermost position in Duan, when oil level exceedes lower limit and is less than upper limit, lights light-emitting diodes
The sections SG2 of middle section position in tube segment, when oil level exceedes upper limit, lights in light-emitting diodes tube segment
The sections SG3 of upper fragment position, thus without arranging light emitting diode separately, can enter with less display element
The status and appearance that row is more.
It is explained above one embodiment of the present invention.But the present invention is not limited by it, can carry out various change
Implement.Such as, in the present embodiment, illustrate the situation with 2 compressors 11, but be not limited to this,
It can be 1 or more than 3.
Now, in order to arrange the display element 52 suitable with number of units on display floater 51, it would however also be possible to employ to
1 compressor 11 distributes the structure of 1 display element 52.
It addition, become 2 grades of formula compressors 11 of intermediate pressure in being not limited to housing 12, it is possible to be suitable for internal accumulation
The known compressor of oil.
It addition, in the present embodiment, illustrate that the present invention is applicable to by the fridge as heat source side equipment
Unit 3 and as the refrigerating plant 1 utilizing showcase unit 5A Yu 5B of side apparatus to constitute but it also may
It is suitable for the structure of known refrigerating plant.
It addition, in the present embodiment, illustrate that fuel level sensor 31 is by detecting upper limit and lower limit
2 contact level transducers situation about constituting, but be not limited to this, it is also possible to by detecting upper limit
With the level transducer of the interposition between lower limit is constituted.
It addition, in the present embodiment, its structure is, when oil level exceedes lower limit and is less than upper limit, and point
The sections SG1 of bright lowermost position and the sections SG2 of middle section position, when oil level exceedes upper limit, lights
The sections SG1 of lower fragment position, the sections SG2 of middle section position and the sections of uppermost position.But can also
Use the structure of the sections only lighting relevant position.
Description of reference numerals
1 refrigerating plant
3 fridge unit (heat source side equipment)
5A, 5B showcase unit (utilizing side apparatus)
10 refrigerant loops
11 compressors
12 housings
21 high pressure discharge pipes
22 oil eliminators
23 gas coolers
27 oil coolers
28,28A, 28B oil return pipe
31 fuel level sensors (oil level detection unit)
50 main control units (valve opening adjustment unit, valve opening amending unit, operation control unit, display
Control unit)
51 display floaters (display unit)
52 display elements
The sections of SG1 lowermost position
The sections of SG2 middle section position
The sections of SG3 uppermost position
Claims (2)
1. a refrigerating plant, has and carbon dioxide is used as cold-producing medium and carries out the refrigeration of freeze cycle operating
Agent loop, this refrigerant loop has: multiple compressors, and it is at housing inner product trapped fuel, and by this oil and system
Cryogen is discharged to high pressure discharge pipe together；Oil eliminator, it is located on described high pressure discharge pipe；And oil return
Pipe, in it makes the oil described housing of return separated by described oil eliminator, described refrigerating plant is characterised by,
Have:
Oil level detection unit, it is respectively arranged at described compressor, for detecting the oil level in described compressor；
Display unit, it has multiple display element, and this display element is according to the detection of this oil level detection unit
Signal, shows the oil condition in this compressor, and the structure of this display element is configured to substantially 8 words for having
7 light-emitting diodes tube segment of shape；And
Display control unit, this display control unit makes the oil of detection signal based on described oil level detection unit
The turned-on position of position and light-emitting diodes tube segment is mutually corresponding and shows,
Multiple described display elements are allocated corresponding to multiple described compressors,
The structure of described display control unit is, when generally operating, shows respectively on described display element
The oil level of corresponding described compressor, and abnormal in the described oil level detection unit generation of a described compressor
Time, the oil level comparing each compressor shows, preferentially shows error coded on multiple described display elements.
2. refrigerating plant as claimed in claim 1, it is characterised in that
The structure of described oil level detection unit for upper limit and lower limit can be detected,
Described display control unit is carried out as follows control: when oil level is less than lower limit, light light-emitting diodes tube coupling
The sections of lowermost position in Duan, when oil level exceedes lower limit and is less than upper limit, lights light-emitting diodes tube coupling
The sections of middle section position in Duan, when oil level exceedes upper limit, lights uppermost position in light-emitting diodes tube segment
Sections.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011252919A JP5914806B2 (en) | 2011-11-18 | 2011-11-18 | Refrigeration equipment |
| JP2011253058A JP2013108654A (en) | 2011-11-18 | 2011-11-18 | Refrigerating apparatus |
| JP2011252918A JP2013108396A (en) | 2011-11-18 | 2011-11-18 | Refrigeration unit |
| JP2011-252918 | 2011-11-18 | ||
| JP2011-252919 | 2011-11-18 | ||
| JP2011-253058 | 2011-11-18 | ||
| PCT/JP2011/078402 WO2013073063A1 (en) | 2011-11-18 | 2011-12-08 | Refrigerating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103946652A CN103946652A (en) | 2014-07-23 |
| CN103946652B true CN103946652B (en) | 2016-08-24 |
Family
ID=48429170
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180074881.6A Active CN103946647B (en) | 2011-11-18 | 2011-12-08 | Refrigerating plant |
| CN201180074876.5A Active CN103946646B (en) | 2011-11-18 | 2011-12-08 | Refrigerating plant |
| CN201180074883.5A Active CN103946652B (en) | 2011-11-18 | 2011-12-08 | Refrigerating plant |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180074881.6A Active CN103946647B (en) | 2011-11-18 | 2011-12-08 | Refrigerating plant |
| CN201180074876.5A Active CN103946646B (en) | 2011-11-18 | 2011-12-08 | Refrigerating plant |
Country Status (2)
| Country | Link |
|---|---|
| CN (3) | CN103946647B (en) |
| WO (3) | WO2013073065A1 (en) |
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| CN103528272B (en) * | 2013-10-30 | 2016-08-24 | 广东志高暖通设备股份有限公司 | A kind of multi-union compressor system |
| CN104864633B (en) * | 2015-06-05 | 2017-11-14 | 珠海格力电器股份有限公司 | Oil balancing control method of air conditioning system |
| JP6594707B2 (en) * | 2015-08-27 | 2019-10-23 | 三菱重工サーマルシステムズ株式会社 | Two-stage compression refrigeration system |
| CN105180533B (en) * | 2015-09-11 | 2018-02-16 | 珠海格力电器股份有限公司 | Screw unit oil return control method and system and screw unit |
| CN106225274A (en) * | 2016-08-25 | 2016-12-14 | 浙江青风环境股份有限公司 | A kind of vortex parallel full-liquid type handpiece Water Chilling Units |
| JP6801714B2 (en) * | 2016-08-29 | 2020-12-16 | Ａｇｃ株式会社 | Thermal cycle system |
| JP6540666B2 (en) * | 2016-11-24 | 2019-07-10 | ダイキン工業株式会社 | Refrigeration system |
| WO2018207274A1 (en) * | 2017-05-10 | 2018-11-15 | 三菱電機株式会社 | Oil separation device and refrigeration cycle device |
| CN107683891B (en) * | 2017-08-29 | 2021-07-20 | 华南理工大学 | Method and equipment for freezing fresh food by liquid carbon dioxide under high pressure |
| CN113217390B (en) * | 2021-05-10 | 2023-02-07 | 广东葆德科技有限公司 | Adjusting system and adjusting method for oil injection quantity of compressor |
| CN113339963B (en) * | 2021-05-12 | 2022-09-02 | 广东Tcl智能暖通设备有限公司 | Compressor oil return control method and system and air conditioner |
| CN114484715B (en) * | 2022-01-10 | 2024-02-20 | 青岛海尔空调电子有限公司 | Multi-compressor refrigerant circulation system and control method thereof |
| CN115143657B (en) * | 2022-06-14 | 2023-12-26 | 特灵空调***(中国)有限公司 | Control method and control device for variable frequency compressor system |
| CN115164300B (en) * | 2022-06-20 | 2024-07-09 | 青岛海尔空调电子有限公司 | Method and device for oil return control of air conditioner, air conditioner and storage medium |
| CN116294328A (en) * | 2023-02-23 | 2023-06-23 | 青岛海尔空调电子有限公司 | Control method and device for water chilling unit and water chilling unit |
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- 2011-12-08 WO PCT/JP2011/078404 patent/WO2013073065A1/en active Application Filing
- 2011-12-08 WO PCT/JP2011/078402 patent/WO2013073063A1/en active Application Filing
- 2011-12-08 CN CN201180074881.6A patent/CN103946647B/en active Active
- 2011-12-08 WO PCT/JP2011/078403 patent/WO2013073064A1/en active Application Filing
- 2011-12-08 CN CN201180074876.5A patent/CN103946646B/en active Active
- 2011-12-08 CN CN201180074883.5A patent/CN103946652B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013073065A1 (en) | 2013-05-23 |
| WO2013073064A1 (en) | 2013-05-23 |
| CN103946647B (en) | 2016-04-06 |
| WO2013073063A1 (en) | 2013-05-23 |
| CN103946646B (en) | 2016-04-06 |
| CN103946647A (en) | 2014-07-23 |
| CN103946652A (en) | 2014-07-23 |
| CN103946646A (en) | 2014-07-23 |
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