WO2006046394A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
- Publication number
- WO2006046394A1 WO2006046394A1 PCT/JP2005/018645 JP2005018645W WO2006046394A1 WO 2006046394 A1 WO2006046394 A1 WO 2006046394A1 JP 2005018645 W JP2005018645 W JP 2005018645W WO 2006046394 A1 WO2006046394 A1 WO 2006046394A1
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- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- compressor
- evaporator
- capacity
- cooling
- Prior art date
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0403—Refrigeration circuit bypassing means for the condenser
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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
- F25B2600/02—Compressor control
- F25B2600/021—Inverters 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention includes a refrigerant circuit in which a variable capacity compressor, a condenser, an expansion mechanism, and an evaporator are connected in order, and the evaporator is connected to a use side circuit through which a heat medium circulates. It is about.
- this type of refrigeration apparatus is, for example, a cooling oil circuit in which cooling oil for cooling a spindle of a machine tool circulates as a heat medium as disclosed in Japanese Patent Application Laid-Open No. 2001-165058 (use side) Circuit) and used to cool the cooling oil to a predetermined temperature.
- the temperature of the cooling oil is controlled using a compressor that performs variable capacity control by an inverter.
- the refrigeration apparatus has a problem that the cooling capacity of the force evaporator cannot be adjusted within the capacity control range of the compressor. For example, there is a problem that control cannot be performed when the cooling capacity needs to be further reduced when the compressor is at the minimum capacity.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a refrigeration apparatus that cools a heat medium of a use side circuit in a refrigerant circuit using a variable capacity compressor.
- the cooling capacity can be adjusted even outside the capacity control range of the compressor, and the adjustment should be made over a wider range than before.
- Solution means taken by the present invention are as follows.
- a first solving means includes a refrigerant circuit (10) in which a variable capacity compressor (11), a condenser (12), an expansion mechanism (13), and an evaporator (14) are connected in order. It is assumed that the evaporator (14) is connected to the user circuit (20) in which the heat medium circulates.
- the refrigeration apparatus of the first solving means suppresses the cooling capacity of the evaporator (14), thereby
- the present invention is characterized in that it has capability suppression means (17) for adjusting the amount of suppression of the cooling capability in accordance with the fluctuation state of the cooling load of the use side circuit (20).
- the refrigerant flows in the refrigerant circuit (10) in order through the compressor (11), the condenser (12), the expansion mechanism (13), and the evaporator (14) in this order. A refrigeration cycle is performed. At that time, in the evaporator (14), the refrigerant also absorbs the heat medium force of the use side circuit (20), and the heat medium is cooled.
- the temperature of the heat medium can be controlled by adjusting the amount of refrigerant circulating in the refrigerant circuit (10).
- the capacity suppression means (17) adjusts the amount of suppression of the cooling capacity in the evaporator (14), thereby evaporating.
- the cooling capacity exhibited by the vessel (14) is adjusted. That is, the capacity suppression means (17) suppresses a part of the cooling capacity to be exhibited by the evaporator (14) based on a predetermined capacity of the compressor (11), and uses the suppression amount for the utilization side circuit (20 ) Increase or decrease according to the cooling load. Therefore, the cooling capacity can be adjusted to the extent that the capacity control of the compressor (11) cannot be achieved.
- the second solving means includes a refrigerant circuit (10) in which a variable capacity compressor (11), a condenser (12), an expansion mechanism (13), and an evaporator (14) are sequentially connected. It is assumed that the evaporator (14) is connected to a utilization side circuit (20) through which the heat medium circulates.
- the refrigeration apparatus of the second solving means includes a hot gas bypass circuit (15) in which the refrigerant discharged from the compressor (11) flows at least by bypassing the condenser (12) and the expansion mechanism (13).
- the hot gas bypass circuit (15) is provided with a flow rate adjustment valve (16).
- the refrigerant flows through the compressor (11), the condenser (12), the expansion mechanism (13), and the evaporator (14) in this order in the refrigerant circuit (10).
- a refrigeration cycle is performed.
- the refrigerant also absorbs the heat medium force of the use side circuit (20), and the heat medium is cooled.
- the temperature of the heat medium can be controlled by adjusting the circulation amount of the refrigerant in the refrigerant circuit (10), and the hot gas bypass circuit.
- the flow rate of the refrigerant circuit (10) can also be adjusted by adjusting the opening of the flow rate adjustment valve (16) of (15).
- the compressor (11) When the amount is fixed, if the flow rate of the hot gas bypass circuit (15) is increased or decreased by adjusting the opening of the flow rate adjustment valve (16), it is possible to control to increase or decrease the cooling capacity of the evaporator (14). In addition, when the compressor (11) is at the minimum capacity and the flow rate adjustment valve (16) is opened to increase the flow rate of the hot gas path circuit (15), the cooling capacity of the evaporator (14) is increased. It is possible to control to further reduce. Therefore, it is possible to adjust the cooling capacity to the extent that the capacity control of the compressor (11) cannot be achieved.
- the third solving means is that in the first solving means, the capacity suppressing means (17) is configured such that the refrigerant discharged from the compressor (11) is at least a condenser (12) and an expansion mechanism (13). Is provided with a hot gas bypass circuit (15) that suppresses the cooling capacity of the evaporator (14) and a flow rate adjustment valve (16) is provided in the hot gas bypass circuit (15).
- the flow rate adjusting valve (16) is adjusted such that when the cooling load of the use side circuit (20) increases, the flow rate is decreased to reduce the amount of suppression of the cooling capacity. It is characterized in that when the cooling load is reduced, the flow rate is adjusted to increase the amount of cooling capacity control.
- the amount of suppression of the cooling capacity in the evaporator (14) is adjusted by adjusting the opening of the flow rate adjusting valve (16). In other words, even when the compressor (11) is fixed at a predetermined capacity, if the cooling load increases, the cooling capacity is reduced by decreasing the cooling capacity suppression amount, and the cooling load decreases. If this happens, increase the amount of cooling capacity to be reduced and decrease the cooling capacity.
- the fourth solving means is characterized in that, in the second or third solving means, the outlet side of the hot gas bypass circuit (15) is connected to the inlet side of the evaporator (14). Trying
- the fifth solving means is characterized in that, in the above second or third solving means, the outlet side of the hot gas noise path circuit (15) is connected to the suction side of the compressor (11).
- the sixth solving means is that in the second or third solving means, the expansion mechanism (13) of the refrigerant circuit (10) is an expansion valve (13) whose opening degree can be controlled. It is a feature.
- the operating capacity of the compressor (11) is changed, the flow rate adjusting valve (16) of the hot gas bypass circuit (15) is adjusted, and the expansion valve ( By adjusting the opening of 13), the cooling capacity of the evaporator (14) can be accurately controlled, so that the temperature of the heat medium in the user side circuit (20) can be adjusted more accurately.
- the seventh solution means in the above second or third solution means is a flow control of the hot gas bypass circuit (15) in a high load region where the cooling load of the use side circuit (20) is relatively large.
- the valve (16) is closed, and the flow control valve (16) of the hot gas bypass circuit (15) is opened in a low load region where the cooling load is smaller than the high load region.
- the cooling capacity of the evaporator (14) is easily reduced by increasing the opening degree of the flow regulating valve (16) of the hot gas bypass circuit (15) in the low load region. It becomes possible.
- the eighth solving means is constituted by an inverter compressor (11) that performs capacity control by the compressor (11) force inverter, and the expansion mechanism (13) can control the opening degree. And an expansion valve (13) connected to the inlet side of the evaporator (14) so that the refrigerant discharged from the compressor (11) flows bypassing the condenser (12) and the expansion mechanism (13).
- the hot gas bypass circuit (15) is provided with a flow rate adjusting valve (16), and the use side circuit (20) receives the cooling oil that cools the spindle of the machine tool as a heat medium. It is characterized by being a circuit.
- the operating capacity of the compressor (11) is controlled by an inverter, and the flow rate adjusting valve (16) of the hot gas bypass circuit (15) is controlled to thereby control the compressor (11).
- the cooling capacity is controlled over a wide range.
- the opening degree of the expansion valve (13) of the refrigerant circuit (10) it becomes possible to control the cooling oil of the machine tool to an accurate temperature.
- the operating capacity of the compressor (11) can be changed to adjust the cooling capacity of the evaporator (14), and the cooling capacity of the evaporator (14) can be suppressed. Since the suppression amount is adjusted according to the variation of the cooling load, the cooling capacity of the evaporator (14) can be adjusted even when the capacity of the compressor (11) is fixed. Therefore, the cooling capacity can be controlled to the extent that the capacity control of the compressor (11) does not reach, and the cooling capacity can be adjusted over a wider range than before.
- the second or third solving means by adjusting the operating capacity of the compressor (11), the amount of refrigerant circulating in the refrigerant circuit (10) is adjusted to control the temperature of the heat medium.
- the refrigerant flow rate of the refrigerant circuit (10) can be adjusted by adjusting the opening of the flow rate adjustment valve (16) of the hot gas bypass circuit (15). For example, when the compressor (11) is set to the minimum capacity, the hot gas bypass circuit (15) is opened, and the flow rate of the hot gas noisy circuit (15) is increased, whereby the cooling capacity of the evaporator (14) is increased. This makes it possible to adjust the cooling capacity over a wider range than before.
- the hot gas bypass circuit (15) is not limited to being used only at the minimum capacity of the compressor (11), but can be used at any operating capacity from the maximum capacity to the minimum capacity of the compressor (11). This also increases the degree of freedom in controlling the refrigerant circuit.
- the compressor (11) does not become excessively low-temperature and low-pressure even if the capacity of the compressor (11) is reduced to the minimum capacity, so that the reliability of the compressor can be improved. Moreover, freezing can be prevented when the heat medium is water.
- the evaporator (14) is cooled more quickly when the flow rate control valve (16) is controlled than when the frequency control is performed. Capabilities can be increased or decreased quickly. Therefore, especially against sudden changes in cooling load The cooling ability can be improved. As a result, the control temperature of the heat medium in the user circuit (20) can be stabilized.
- the cooling capacity is controlled by the capacity of the compressor (11) by connecting the outlet side of the hot gas bypass circuit (15) to the inlet side of the evaporator (14). It is possible to make adjustments within the range that does not reach, and to make adjustments quickly. Therefore, it is possible to control the cooling capacity over a wider range and with higher response than before.
- the cooling capacity is controlled by the capacity of the compressor (11) by connecting the outlet side of the hot gas bypass circuit (15) to the suction side of the compressor (11). It is possible to make adjustments within the range that does not reach, and to make adjustments quickly. Therefore, it is possible to control the cooling capacity over a wider range and with higher response than before.
- the expansion mechanism (13) of the refrigerant circuit (10) is the expansion valve (13) whose opening degree can be controlled, the operating capacity of the compressor (11) is reduced.
- the flow rate adjustment valve (16) of the hot gas bypass circuit (15) can be adjusted and the expansion valve (13) of the refrigerant circuit (10) can be further opened.
- the cooling capacity of the evaporator (14) can be accurately controlled, so that the temperature of the heat medium in the user side circuit (20) can be adjusted more accurately.
- the flow rate adjusting valve (16) of the hot gas bypass circuit (15) is not opened in the high load region, and the flow rate adjusting valve (16) is opened only in the low load region. Opening can simplify the capacity control of the evaporator (14).
- the hot gas bypass circuit (15) is not opened in the high load region where the variable capacity compressor (11) is used in a large capacity, so that the compressor power is not wasted.
- the compressor (11) of the refrigerant circuit (10) is constituted by the inverter compressor (11) and the expansion mechanism (13) can be controlled in its opening degree. 13) and a hot gas bypass circuit (15) having a flow rate adjusting valve (16) is provided, so that the cooling capacity of the evaporator (14) can be accurately controlled over a wide range.
- FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to Embodiment 1.
- FIG. 2 is a graph showing control states of the inverter compressor and the flow rate adjustment valve.
- Fig. 3 is a special feature showing control of the inverter compressor and flow control valve in response to load fluctuations. 'Gender diagram.
- FIG. 4 is a graph showing the relationship between compressor frequency and capacity.
- FIG. 5 is a refrigerant circuit diagram of a refrigeration apparatus according to Embodiment 2.
- FIG. 6 is a characteristic diagram showing control of the inverter compressor and the flow rate adjustment valve with respect to load fluctuations according to the third embodiment.
- FIG. 7 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- FIG. 8 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- FIG. 9 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- FIG. 10 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- FIG. 11 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- FIG. 12 is a refrigerant circuit diagram of a refrigeration apparatus according to another embodiment.
- Cooling oil circuit (use side circuit)
- the refrigeration apparatus (1) of Embodiment 1 is a cooling as a user side circuit in which cooling oil for cooling the spindle (21) that is a rotating part of the machine tool circulates as a heat medium.
- oil A refrigerant circuit (10) connected to the circuit (20) to cool the cooling oil to a predetermined temperature is provided.
- the refrigerant circuit (10) is a closed circuit configured by connecting a variable capacity compressor (11), a condenser (12), an expansion mechanism (13), and an evaporator (14) in this order.
- the oil circuit (20) is connected to the evaporator (14).
- the compressor (11) is composed of an inverter compressor (11) capable of controlling the operation capacity by inverter-controlling the electric motor.
- the expansion mechanism (13) includes an electric expansion valve (13) whose opening degree can be continuously controlled.
- the refrigerant circuit (10) is provided with a hot gas bypass circuit (15).
- This hot gas bypass circuit (15) is a circuit in which the refrigerant discharged from the compressor (11) flows bypassing the condenser (12) and the electric expansion valve (13).
- the outlet side of the hot gas bypass circuit (15) is connected to the inlet side of the evaporator (14).
- an electric valve force capable of continuously changing the opening degree is provided as a flow rate adjusting valve (16).
- the hot gas bypass circuit (15) and the flow rate adjusting valve (16) constitute a capability suppressing means (17) that adjusts the amount of suppression of the cooling capability in the evaporator (14).
- the refrigeration apparatus (1) is described as a flow rate adjusting valve (16) (in the figure, “HG valve”) of the hot gas bypass circuit (15). ) Is closed in a high load region where the cooling load of the cooling oil circuit (20) is relatively large, while the opening degree is adjusted in a low load region where the cooling load is smaller than the high load region.
- the capacity of the inverter compressor (11) is controlled only in the high load region and not in the low load region. By performing the above control, the cooling capacity can be continuously changed steplessly with respect to load fluctuations as shown in Fig. 2 (C).
- the capacity suppression means (17) reduces the amount of suppression of the cooling capacity by reducing the opening of the flow regulating valve (16), Conversely, when the cooling load decreases, the opening of the flow control valve (16) is increased to increase the amount of cooling capacity suppression.
- the capacity suppressing means (17) adjusts the amount of cooling capacity to be suppressed by adjusting the flow rate of the hot gas bypass circuit (15) to increase or decrease the enthalpy of the refrigerant flowing through the evaporator (14). .
- the high-temperature and high-pressure gas refrigerant discharged from the compressor (11) is also condensed and liquefied by exchanging heat with air when flowing through the condenser (12).
- This liquid refrigerant expands in the electric expansion valve (13) and becomes a low-pressure gas-liquid two-phase refrigerant.
- this gas-liquid two-phase refrigerant flows through the evaporator (14), it absorbs heat from the cooling oil in the cooling oil circuit (20) and gasifies, and at that time, the cooling oil is cooled to a predetermined temperature. .
- the refrigerant gasified by the evaporator (14) returns to the compressor (11), and the above-described compression, condensation, expansion, and evaporation steps are repeated in order.
- the frequency control of the inverter is performed with the flow rate adjustment valve (16) of the hot gas bypass circuit (15) being “closed”. Adjust the cooling capacity of the evaporator (14). That is, in this high load region, the cooling capacity suppression amount by the capacity suppression means (17) is zero.
- the opening degree control of the flow rate adjustment valve (16) of the hot gas bypass circuit (15) is performed in a state where the frequency of the inverter is fixed to the minimum frequency.
- the cooling capacity of the evaporator (14) is adjusted.
- the capacity can be continuously changed by adjusting only the flow rate adjustment valve (16) on the low load side and adjusting only the frequency of the inverter on the high load side. That is, the cooling capacity of the evaporator (14) can be adjusted to a range of low capacity unless the capacity control of the compressor (11) can be controlled.
- the responsiveness of capacity control to a sudden change in cooling load is improved as compared with the capacity control of the inverter compressor (11).
- the reason for protecting the compressor is limited, and the rate of change in frequency is limited, so the capacity changes in stages. Thereby, the follow-up of the cooling capacity of the evaporator (14) is delayed.
- the cooling capacity can be changed quickly.
- the opening degree control of the flow regulating valve (16) is performed in a low load region and with the inverter frequency fixed to the minimum frequency.
- the opening degree of the flow rate adjusting valve (16) may be controlled with the frequency of the inverter fixed at the maximum frequency.
- the cooling capacity can be adjusted to the extent that the capacity control of the compressor (11) cannot be controlled, and the responsiveness of the cooling capacity to sudden load fluctuations is improved.
- the cooling capacity of the evaporator (14) can only be controlled within the variable capacity range of the inverter compressor (11), but in the first embodiment, as shown in FIG. Open the hot gas no-pass circuit (15) with the operating capacity of the compressor (11) minimized by setting the number to the lower limit, and increase the flow rate of the hot gas bypass circuit (15).
- the lower limit of the cooling capacity in the evaporator (14) can be further reduced and the controllable range can be expanded compared to the conventional refrigeration system (1) using only the inverter compressor (11). It becomes possible.
- the flow rate adjustment valve (16) of the hot gas bypass circuit (15) can be controlled.
- the electric expansion valve (13) of the refrigerant circuit (10) may be controlled, the control of the flow rate adjustment valve (16) has higher resolution than the electric expansion valve (13). Control is possible.
- the flow rate adjusting valve (16) of the hot gas bypass circuit (15) is controlled only when the operating capacity of the compressor (11) becomes the minimum capacity. But the flow If the control of the quantity adjustment valve (16) can be performed over the entire frequency range of the inverter, the cooling capacity can be controlled within the range indicated by the hatched lines in Fig. 4 (B).
- the cooling capacity of the evaporator (14), which is faster in responsiveness than the control of the frequency of the inverter compressor (11), can be increased or decreased more quickly. be able to. Therefore, it becomes possible to perform quick and accurate control even for a sudden change in cooling load, and the control temperature of the cooling oil can be stabilized. That is, in the first embodiment, the cooling capacity to be exhibited by the evaporator (14) is suppressed and the amount of suppression is adjusted, so that the cooling capacity can be changed quickly. However, controlling the inverter compressor (11) improves energy efficiency.
- Controlling three of (16) and the electric expansion valve (13) of the refrigerant circuit (10) at the same time increases the response capacity range of the hot gas bypass circuit (15), thereby improving control responsiveness.
- this makes it possible to control the capacity from the maximum cooling capacity at that frequency to less than zero capacity (heating) as shown in Fig. 4 (C).
- the refrigeration apparatus (1) of Embodiment 2 is an example in which the configuration of the hot gas bypass circuit (15) of the capacity suppression means (17) of Embodiment 1 is changed.
- the outlet side is connected to the suction side of the compressor (11), and the refrigerant discharged from the compressor (11) is discharged.
- the condenser (12) flows by bypassing the expansion mechanism (13) and the evaporator (14).
- the flow rate adjustment valve (16) one motor-operated valve capable of continuously adjusting the opening degree as in the first embodiment is provided. .
- the capacity suppressing means (17) adjusts the amount of cooling capacity to be controlled by adjusting the flow rate of the hot gas bypass circuit (15) to increase or decrease the flow rate of refrigerant flowing through the evaporator (14).
- the flow regulating valve (16) of the hot gas bypass circuit (15) is closed in a high load region where the cooling load of the cooling oil circuit (20) is relatively large. Open in a low load area that is smaller than the high load area.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor (11) is also condensed and liquefied by exchanging heat with air when flowing through the condenser (12).
- This liquid refrigerant expands in the electric expansion valve (13) and becomes a low-pressure gas-liquid two-phase refrigerant.
- this gas-liquid two-phase refrigerant flows through the evaporator (14), it absorbs heat from the cooling oil in the cooling oil circuit (20) and gasifies, and at that time, the cooling oil is cooled to a predetermined temperature. .
- the refrigerant gasified by the evaporator (14) returns to the compressor (11), and the above compression, condensation, expansion, and evaporation steps are repeated in order.
- the capacity control of the inverter compressor (15) and the opening degree control of the flow rate adjustment valve (16) in the hot gas bypass circuit (15) are performed, and the electric power of the refrigerant circuit is further controlled.
- the opening of the expansion valve (13) By controlling the opening of the expansion valve (13), the cooling capacity of the evaporator (14) can be controlled continuously.
- the hot gas binos circuit (15) in the refrigerant circuit using the inverter compressor (11) by providing the hot gas binos circuit (15) in the refrigerant circuit using the inverter compressor (11), the conventional refrigeration using only the inverter compressor (11) is provided.
- the lower limit value of the cooling capacity in the evaporator (14) can be further reduced, and the controllable range can be expanded, and the responsiveness of the cooling capacity to sudden changes in cooling load can be improved. improves.
- Other configurations, operations, and effects are the same as those in the first embodiment.
- the refrigeration apparatus (1) of Embodiment 3 is an example in which the control method of the capacity suppression means (17) of Embodiment 1 is changed. That is, in the third embodiment, as shown in FIG. 6, a fluctuation signal of the cooling load is received in advance from the machine tool side.
- the frequency of the inverter is increased to a maximum frequency, for example, and fixed (FIG. 6B). reference).
- the opening degree of the flow regulating valve (16) is also increased (see FIG. 6 (C)).
- the cooling load actually increases (see Fig. 6 (A))
- the opening of the flow control valve (16) is reduced while the inverter is fixed at the maximum frequency (see Fig. 6 (C)).
- the opening of the flow rate adjustment valve (16) is increased again and held until a predetermined time has elapsed.
- the inverter is fixed at the maximum frequency until the predetermined time has elapsed. This place In this case, the cooling capacity exerted by the evaporator (14) increases rapidly (see Fig. 6 (D)), and the control temperature of the cooling oil can be stabilized (see Fig. 6 (E)). When the cooling load decreases, the inverter is reduced in advance to a predetermined frequency.
- the present invention may be configured as follows for each of the above embodiments.
- the hot gas bypass circuit (15) A three-way valve capable of adjusting the flow rate may be provided at one of the connection point on the inlet side and the connection point on the outlet side of the hot gas binos circuit (15) as shown in FIGS. .
- the flow regulating valve (16) of the hot gas bypass circuit (15) is provided with, for example, three solenoid valves (16a, 16b, 16c) arranged in parallel. You may do it. In this case, by opening and closing each solenoid valve (16a, 16b, 16c), the flow rate of the hot gas bypass circuit (15) is increased or decreased in stages, and the amount of suppression of the cooling capacity is adjusted. Note that the number of solenoid valves is not limited to this, and flow control can be performed more continuously as the number increases. Further, a plurality of solenoid valves and capillary tubes connected in series may be provided in parallel.
- the heat medium of the use side circuit (20) is the cooling oil of the machine tool
- the heat medium may be an electric discharge machining fluid (water or oil), a machine tool
- various liquids that directly or indirectly cool the heating element such as the cooling liquid of the bed actuator (linear motor, etc.) that moves the cake, the cooling liquid of the oscillation part of the laser processing machine, or the cooling liquid of the semiconductor Moh.
- the present invention includes a refrigerant circuit (10) in which a variable capacity compressor (11), a condenser (12), an expansion mechanism (13), and an evaporator (14) are connected in order.
- the evaporator (14) is useful for a refrigeration apparatus (1) connected to a utilization side circuit through which a heat medium circulates.
Abstract
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004315989 | 2004-10-29 | ||
JP2004-315989 | 2004-10-29 | ||
JP2005006528A JP2006153418A (ja) | 2004-10-29 | 2005-01-13 | 冷凍装置 |
JP2005-006528 | 2005-01-13 |
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WO2006046394A1 true WO2006046394A1 (ja) | 2006-05-04 |
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PCT/JP2005/018645 WO2006046394A1 (ja) | 2004-10-29 | 2005-10-07 | 冷凍装置 |
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JP (1) | JP2006153418A (ja) |
TW (1) | TWI272361B (ja) |
WO (1) | WO2006046394A1 (ja) |
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CN115289883A (zh) * | 2022-05-31 | 2022-11-04 | 苏州浪潮智能科技有限公司 | 一种降温装置和数据中心 |
CN115978818A (zh) * | 2022-12-22 | 2023-04-18 | 江苏拓米洛高端装备股份有限公司 | 一种环境试验设备的控制方法及控制装置 |
WO2024002177A1 (zh) * | 2022-06-29 | 2024-01-04 | 莱尔德热系统(深圳)有限公司 | 准确控温的制冷系统 |
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CN114375381A (zh) * | 2019-09-17 | 2022-04-19 | 莱尔德热系统有限公司 | 用于改变负荷的调温制冷系统 |
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CN115289883B (zh) * | 2022-05-31 | 2024-01-26 | 苏州浪潮智能科技有限公司 | 一种降温装置和数据中心 |
WO2024002177A1 (zh) * | 2022-06-29 | 2024-01-04 | 莱尔德热系统(深圳)有限公司 | 准确控温的制冷系统 |
CN115978818A (zh) * | 2022-12-22 | 2023-04-18 | 江苏拓米洛高端装备股份有限公司 | 一种环境试验设备的控制方法及控制装置 |
CN115978818B (zh) * | 2022-12-22 | 2023-09-29 | 江苏拓米洛高端装备股份有限公司 | 一种环境试验设备的控制方法及控制装置 |
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TW200619573A (en) | 2006-06-16 |
JP2006153418A (ja) | 2006-06-15 |
TWI272361B (en) | 2007-02-01 |
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