WO2009093282A1 - 冷媒センサの取付構造および冷媒センサの取付方法 - Google Patents
冷媒センサの取付構造および冷媒センサの取付方法 Download PDFInfo
- Publication number
- WO2009093282A1 WO2009093282A1 PCT/JP2008/000071 JP2008000071W WO2009093282A1 WO 2009093282 A1 WO2009093282 A1 WO 2009093282A1 JP 2008000071 W JP2008000071 W JP 2008000071W WO 2009093282 A1 WO2009093282 A1 WO 2009093282A1
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- WIPO (PCT)
- Prior art keywords
- refrigerant
- sensor
- thermistor
- pipe
- shaped joint
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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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
- F25B49/00—Arrangement or mounting of control or safety devices
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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
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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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
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
-
- 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
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
Definitions
- the present invention relates to a refrigerant sensor mounting structure and a refrigerant sensor mounting method for detecting a physical quantity related to a refrigerant flowing in a pipe of a refrigeration cycle.
- the sensor When detecting a physical quantity such as the temperature, pressure, or flow rate of the refrigerant flowing in the piping of the refrigeration cycle, the sensor (detector) is directly brought into contact with the refrigerant in the piping. It is preferable to detect automatically.
- a hole is provided in the pipe wall of the straight line or the straight connection pipe, and the sensor detection element is provided in the hole so as to protrude into the pipe or the connection pipe.
- Provided so as to be located in the back of the road for example, refer to Patent Document 1
- JP 59-182315 Fig. 3
- JP 59-37419 FIG. 2
- the detection element of the sensor is provided so as to protrude into the pipe (in the refrigerant flow path), the flow of the refrigerant flowing through the pipe may be hindered.
- the detection element of the sensor is provided in a part deeper from the flow path of the pipe, among the refrigerants flowing in layers in the pipe, the influence of the refrigerant passing near the detection element is large, It is difficult to detect an average physical quantity, and there is a drawback that the detection accuracy is not enough.
- oil contained in the refrigerant flowing in the pipe or liquid refrigerant in liquid form may accumulate in the detection element portion. There is a risk that accuracy will be significantly reduced.
- a first object of the present invention is to provide a refrigerant sensor mounting structure that can prevent the flow of a refrigerant as much as possible while having a configuration that directly detects the physical quantity of the refrigerant and that has a high detection accuracy.
- the second object of the present invention is to provide an attachment method of the refrigerant sensor that can favorably attach the refrigerant sensor to the T-shaped joint to be attached.
- the present invention provides a refrigerant sensor mounting structure for detecting a physical quantity related to a refrigerant flowing in a pipe of a refrigeration cycle, and has a cylindrical main pipe portion having both ends opened. And a cylindrical branch pipe part branched from the axial middle part of the main pipe part and having an open end, and formed in a T-shape as a whole, and one end of the main pipe part is connected to the pipe A thermistor, and a thermistor.
- the thermistor includes a T-shaped joint having a second connection portion for connecting the other end portion of the main pipe portion to the pipe and the branch pipe portion to the pipe.
- a refrigerant sensor hermetically attached to the sensor attachment portion so as to fit in the sensor attachment portion, and the first connection portion and the second connection portion of the T-shaped joint are connected to the pipe.
- the serial sensor attachment portion side characterized in that disposed higher than the first connecting portion.
- the present invention forms a cylindrical main tube portion having both ends opened, and a cylindrical shape branched from an intermediate portion in the axial direction of the main tube portion and having a tip portion opened.
- a step of fixing a cylindrical metal adapter to the sensor attachment portion by brazing, and a base substrate Lee A step of hermetically fixing the lead terminal to the base substrate via glass in a state of penetrating the terminal, and a step of unitizing the thermistor to the base substrate by connecting the terminal of the thermistor to the lead terminal And fixing the base substrate obtained by unitizing the thermistor to the opening of the adapter by laser welding in a state where the thermistor is inserted into the sensor mounting portion.
- the refrigerant sensor mounting structure of the present invention the following effects can be obtained. Since the refrigerant sensor is configured to be attached to the sensor attachment portion facing the first connection portion of the main pipe portion in the T-shaped joint, the thermistor that is the detection element can be brought into direct contact with the refrigerant, and the physical quantity of the refrigerant can be directly Can be detected. Since the thermistor is disposed so as to be accommodated in the sensor mounting portion, it is possible to prevent the thermistor from obstructing the flow of the refrigerant flowing through the T-shaped joint.
- the thermistor is arranged in a portion where the refrigerant turns 90 degrees between the first connection portion and the second connection portion, turbulence is likely to occur there, and the average physical quantity of the refrigerant Can be detected as accurately as possible, and the detection accuracy can be increased.
- the refrigerant sensor can be disposed at a position where the oil or liquid refrigerant in the refrigerant does not accumulate, whereby the thermistor Can be hardly affected by the oil or liquid refrigerant, and can prevent the detection accuracy from being lowered. Since the sensor mounting portion to which the refrigerant sensor is attached has a cylindrical shape, the thermistor can be disposed relatively easily at the center of the sensor mounting portion.
- the step of airtightly fixing the lead terminal to the base substrate through glass with the lead terminal penetrating through the base substrate is performed in a high temperature atmosphere.
- the thermistor can be prevented from being damaged.
- the thermistor terminal is connected to the lead terminal fixed to the base substrate, and the thermistor is unitized into the base substrate.
- the base substrate is inserted into the sensor mounting portion in the state where the thermistor is inserted into the sensor mounting portion.
- the thermistor which is a detection element can be satisfactorily attached by fixing by laser welding.
- FIG. 1 shows an embodiment of the present invention and is a diagram showing a schematic configuration during cooling of a refrigeration cycle.
- FIG. 2 is a diagram showing a schematic configuration during heating of the refrigeration cycle.
- FIG. 3 is an enlarged cross-sectional view showing the refrigerant sensor mounting structure.
- FIG. 4 is an exploded cross-sectional view for explaining a method of attaching the refrigerant sensor.
- 1 is a compressor
- 2a to 2l are pipes
- 3 is a T-shaped joint
- 4 is a 4-way valve
- 5 is a first heat exchanger
- 7 is a second heat exchanger
- 8 is a T-shaped joint
- 10A is for cooling.
- Refrigerant circuit, 10B is a heating refrigerant circuit
- 12 is a T-shaped joint
- 14 is a T-shaped joint
- 20 is a main pipe part
- 21 is a branch pipe part
- 22 is a first connection part
- 23 is a sensor attachment part
- 24 is a first 2
- 26 a refrigerant sensor
- 30 an adapter
- 30a an opening, 31 a filter, 32 a base substrate, 33 a through hole, 34 a lead terminal, 35 a glass
- C represents a refrigeration cycle
- R represents a refrigerant.
- FIG. 1 shows a schematic configuration diagram of the refrigeration cycle C during cooling
- FIG. 2 shows a schematic configuration diagram of the refrigeration cycle C during heating.
- the refrigeration cycle C can be switched between a cooling refrigerant circuit 10A shown in FIG. 1 and a heating refrigerant circuit 10B shown in FIG.
- a schematic configuration of the refrigeration cycle C will be described mainly using the cooling refrigerant circuit 10A of FIG.
- the refrigerant R is indicated by a broken-line arrow indicating the flow direction.
- a first pipe 2 a, a T-shaped joint 3, and a second pipe 2 b are connected in series to the discharge port 1 a of the compressor 1, and the tip of the second pipe 2 b is connected to the first port 4 a of the four-way valve 4. Yes.
- the four-way valve 4 is provided with a first port 4a, a second port 4b, a third port 4c, and a fourth port 4d.
- the four-way valve 4 is in communication between the first port 4a and the second port 4b, and in communication with the third port 4c and the fourth port 4d.
- the first port 4a and the third port 4c are in communication with each other, and the second port 4b and the fourth port 4d are switched in communication.
- the second port 4b of the four-way valve 4 includes a third pipe 2c, a first heat exchanger 5, a fourth pipe 2d, an expansion valve 6, a fifth pipe 2e, a second heat exchanger 7, and a sixth pipe. 2f is connected in series, and the tip of the sixth pipe 2f is connected to the third port 4c of the four-way valve 4.
- the fourth port 4d that is in communication with the third port 4c connects the seventh pipe 2g, the T-shaped joint 8, the eighth pipe 2h, and the accumulator 9 in series. It is connected to the inlet 1b.
- the 8th pipe 2h and the accumulator 9 are connected in order to constitute a loop-shaped cooling refrigerant circuit 10A in which the refrigerant R circulates.
- the second heat exchanger 7 is arranged in a room used by the user.
- a first bypass circuit 11 is provided between the middle part of the second pipe 2b and the middle part of the first heat exchanger 5.
- the first bypass circuit 11 is configured by connecting in series a ninth pipe 2i, a T-shaped joint 12, and a tenth pipe 2j whose one end is connected to the middle part of the second pipe 2b.
- a second bypass circuit 13 is provided between the middle portion of the second heat exchanger 7 and the sixth pipe 2f.
- the second bypass circuit 13 is configured by connecting an eleventh pipe 2k, a T-shaped joint 14, and a twelfth pipe 21 connected in series at one end to the middle portion of the second heat exchanger 7.
- the T-shaped joint 3 has a cylindrical shape with a cylindrical main body 20 having both ends opened and a branching from an axial intermediate portion of the main pipe 20, and a distal end opened. And a branch pipe portion 21 that forms a T-shape as a whole.
- the T-shaped joint 3 is made of metal, for example, copper.
- One end portion of the main pipe portion 20 is a first connection portion 22, the other end portion of the main pipe portion 20 is a sensor attachment portion 23, and the branch pipe portion 21 is a second connection portion 24.
- the main pipe portion 20 and the branch pipe portion 21 are substantially orthogonal to each other, and the first connection portion 22 and the second connection portion 24 are substantially different in direction by 90 degrees.
- coolant sensor 26 which has the thermistor 25 as a detection element is attached to the sensor attachment part 23.
- FIG. A refrigerant sensor 26 having a thermistor 25 as a detection element is also attached to each sensor attachment portion 23 of the T-shaped joints 8, 12, and 14 with the same attachment structure as the T-shaped joint 3.
- the detection signal of each refrigerant sensor 26 (thermistor 25) is output to a control device (not shown).
- An adapter 30 having a cylindrical shape made of metal, for example, iron is fixed to the sensor mounting portion 23 in an inserted state.
- a filter 31 for protecting the thermistor 25 is attached to the distal end of the adapter 30 on the insertion side.
- the adapter 30 is fixed to the sensor mounting portion 23 by brazing the peripheral edge of the opening 23 a of the sensor mounting portion 23 with the adapter 30 provided with the filter 31 inserted in the sensor mounting portion 23. is doing.
- a base substrate 32 having a disk shape is fixed to the inner peripheral portion of the opening 30a of the adapter 30 by laser welding so as to close the opening 30a.
- Two through holes 33 are formed in the base substrate 32, and lead terminals 34 each having a pin shape are fixed to each through hole 33 through a glass 35.
- Each lead terminal 34 penetrates the base substrate 32.
- the two terminals 25a of the thermistor 25 are connected to the two lead terminals 34 by, for example, laser welding.
- the thermistor 25 is disposed between the filter 31 and the base substrate 32 in the adapter 30.
- the thermistor 25 is disposed so as to be accommodated in the sensor mounting portion 23 in the T-shaped joint 3. Therefore, the refrigerant sensor 26 is airtightly attached to the sensor attachment portion 23 so that the thermistor 25 fits in the sensor attachment portion 23.
- the adapter 30 is fitted into the sensor attachment portion 23 so as to be inserted into the opening portion 23a of the sensor attachment portion 23 from the filter 31 side. At this time, a part of the adapter 30 slightly protrudes outward from the opening 23 a of the sensor mounting portion 23. In this state, the adapter 30 is fixed to the sensor mounting portion 23 by brazing the peripheral edge portion of the opening 23 a of the sensor mounting portion 23.
- a flange that projects laterally is integrally provided on the outer peripheral portion of the end of the adapter 30 so that the flange contacts the opening end of the sensor mounting portion 23, so that the sensor mounting
- the adapter 30 can be positioned with respect to the portion 23.
- the base substrate 32 and the lead terminals 34 and the glass 35 are set on the jigs (not shown) so as to be positioned in the two through holes 33 of the base substrate 32 and fired in a firing furnace (not shown).
- the lead terminal 34 is airtightly fixed to the base substrate 32 through the glass 35.
- the thermistor 25 is fixed to the lead terminal 34 by laser welding, so that the thermistor 25 is unitized with the base substrate 32.
- the base substrate 32 in which the thermistor 25 is unitized is disposed in the opening 30a of the adapter 30 in a state where the thermistor 25 is inserted into the sensor mounting portion 23 so as to close the outer periphery of the base substrate 32.
- the part is fixed to the adapter 30 by laser welding.
- the attachment of the refrigerant sensor 26 to the sensor attachment portion 23 is completed.
- a stepped portion projecting inward is integrally provided on the inner peripheral portion of the adapter 30, and the base substrate 32 is inserted when the base substrate 32 is inserted into the opening 30 a of the adapter 30 so as to close it.
- the base substrate 32 can be positioned with respect to the adapter 30 by making it hit the stepped portion.
- the T-shaped joint 3 to which the refrigerant sensor 26 is attached is connected to the first pipe 2a with the first connection portion 22 facing downward, and the second connection portion 24 is turned sideways to the second pipe 2b.
- the refrigerant sensor 26 sensor mounting portion 23
- the sensor mounting part 23 side of the main pipe part 20 is arranged to be higher than the first connection part 22 side.
- the refrigerant sensor 26 thermoistor 25 provided in the T-shaped joint 3 is used to detect the discharge temperature of the refrigerant R discharged from the compressor 1 and to estimate the discharge pressure from the temperature.
- the T-shaped joint 8 to which the refrigerant sensor 26 is attached is connected to the seventh pipe 2g with the first connection portion 22 facing downward, and connected to the eighth pipe 2h with the second connection portion 24 facing sideways.
- the refrigerant sensor 26 (sensor mounting portion 23) is disposed in the upper part. Also in this case, the sensor attachment part 23 side of the main pipe part 20 is arranged to be higher than the first connection part 22 side.
- the refrigerant sensor 26 (thermistor 25) provided in the T-shaped joint 8 is used to detect the liquid return of the refrigerant R returning to the compressor 1.
- the refrigerant sensor 26 is self-heated by passing an electric current through the thermistor 25 and detects liquid return based on the degree of decrease in the temperature detected by the thermistor 25.
- the T-shaped joint 12 to which the refrigerant sensor 26 is attached is connected to the ninth pipe 2i with the first connecting portion 22 facing downward and connected to the tenth pipe 2j with the second connecting portion 24 facing sideways.
- the refrigerant sensor 26 (sensor mounting portion 23) is disposed in the upper part. Also in this case, the sensor attachment part 23 side of the main pipe part 20 is arranged to be higher than the first connection part 22 side.
- the refrigerant sensor 26 (thermistor 25) provided in the T-shaped joint 12 diverts a part of the refrigerant flowing through the third pipe 2c during cooling, detects the flow rate of the divided refrigerant, and passes the third pipe 2c through the third pipe 2c. Used to estimate the flow rate of flowing refrigerant.
- the refrigerant sensor 26 is also self-heated by passing an electric current through the thermistor 25, and the flow rate of the refrigerant is estimated by the degree of decrease in the temperature detected by the thermistor 25.
- the T-shaped joint 14 to which the refrigerant sensor 26 is attached is connected to the eleventh pipe 2k with the first connection portion 22 facing downward, and connected to the twelfth pipe 21 with the second connection portion 24 facing sideways.
- the refrigerant sensor 26 (sensor mounting portion 23) is disposed in the upper part. Also in this case, the sensor attachment part 23 side of the main pipe part 20 is arranged to be higher than the first connection part 22 side.
- the refrigerant sensor 26 (thermistor 25) provided in the T-shaped joint 14 divides a part of the refrigerant flowing through the sixth pipe 2f during heating in FIG. 2, detects the flow rate of the divided refrigerant, It is used to estimate the flow rate of the refrigerant flowing through the pipe 2f.
- the refrigerant sensor 26 is also self-heated by passing an electric current through the thermistor 25, and the flow rate of the refrigerant is estimated by the degree of decrease in the temperature detected by the thermistor 25.
- the thermistor 25 of the refrigerant sensor 26 attached to the sensor attachment portion 23 of the T-shaped joint 3 outputs a detection signal corresponding to the discharge temperature of the refrigerant R discharged from the compressor 1 to the control device.
- the control device detects the discharge temperature based on the detection signal and estimates the discharge pressure from the temperature.
- the refrigerant R flowing through the T-shaped joint 3 changes its direction by 90 degrees when flowing from the first connecting portion 22 to the second connecting portion 24, and turbulent flow is likely to occur at the bent portion. .
- the control device can detect the average temperature of the refrigerant R flowing through the T-shaped joint 3 as accurately as possible by the thermistor 25.
- a part of the refrigerant R flowing through the third pipe 2c is branched to the ninth pipe 2i side of the first bypass circuit 11.
- the divided refrigerant R flows into the first heat exchanger 5 through the T-shaped joint 12 and the tenth pipe 2j.
- the self-heating is performed by passing a current through the thermistor 25 of the refrigerant sensor 26 attached to the sensor attachment portion 23 of the T-shaped joint 12, the degree of decrease in the detected temperature of the thermistor 25 is detected, and the detection signal is sent to the control device. Output to.
- the control device estimates the flow rate of the refrigerant R flowing through the first bypass circuit 11 based on the detection signal, and thus estimates the flow rate of the refrigerant R flowing through the third pipe 2c.
- the control device can accurately measure the degree of temperature decrease due to the refrigerant R flowing through the T-shaped joint 12 with the thermistor 25, and can estimate the flow rate of the refrigerant R from the detected value as accurately as possible. It becomes possible.
- the refrigerant R that has flowed into the first heat exchanger 5 dissipates heat and liquefies (condenses) in the course of flowing therethrough.
- the first heat exchanger 5 functions as a condenser (condenser).
- the liquefied refrigerant R flows into the second heat exchanger 7 through the fourth pipe 2d, the expansion valve 6, and the fifth pipe 2e.
- the refrigerant R flowing into the second heat exchanger 7 evaporates here, and at that time, the surrounding heat is taken away and the surrounding is cooled.
- the second heat exchanger 7 functions as an evaporator (evaporator).
- the user uses the second heat exchanger 7 as a cooler.
- the refrigerant R evaporated and gasified in the second heat exchanger 7 is the sixth port 2f, the third port 4c of the four-way valve 4, the fourth port 4d, the seventh port 2g, the T-shaped joint 8, the eighth port 8c. It passes through the pipe 2h and the accumulator 9, flows into the compressor 1 from the inlet 1b of the compressor 1, is compressed again, and is discharged from the discharge port 1a as high-temperature and high-pressure gas.
- the control device estimates whether or not liquid refrigerant is contained in the refrigerant R flowing through the T-shaped joint 8 based on the detection signal, and detects the liquid return of the refrigerant R returning to the compressor 1. Also at this time, the refrigerant R flowing through the T-shaped joint 8 changes its direction by 90 degrees when flowing from the first connecting portion 22 to the second connecting portion 24, and turbulent flow is likely to occur at the bent portion. Become. For this reason, the control device can detect the temperature of the refrigerant R flowing through the T-shaped joint 8 with the thermistor 25 as accurately as possible, and thus can detect the liquid return as accurately as possible.
- the physical quantity of the refrigerant R is not detected for the refrigerant sensor 26 of the T-shaped joint 14 provided in the second bypass circuit 13.
- the first port 4a and the third port 4c of the four-way valve 4 are in communication with each other, and the second port 4b and the second port 4b are connected to each other. It is switched so that the 4 ports 4d are in communication.
- the compressor 1 is started in this state, the refrigerant R that has become a high-temperature and high-pressure gas in the compressor 1 is discharged from the discharge port 1a.
- the refrigerant R discharged from the discharge port 1a passes through the first pipe 2a, the T-shaped joint 3, the second pipe 2b, the first port 4a, the third port 4c, and the sixth pipe 2f of the four-way valve 4 for the second.
- the thermistor 25 of the refrigerant sensor 26 attached to the sensor attachment portion 23 of the T-shaped joint 3 outputs a detection signal corresponding to the discharge temperature of the refrigerant R discharged from the compressor 1 in the same manner as during cooling. Output to.
- the control device detects the discharge temperature based on the detection signal and estimates the discharge pressure from the temperature.
- a part of the refrigerant R flowing through the sixth pipe 2f is diverted to the twelfth pipe 21 side of the second bypass circuit 13.
- the separated refrigerant R flows into the second heat exchanger 7 through the T-shaped joint 14 and the eleventh pipe 2k.
- Self-heating is performed by passing a current through the thermistor 25 of the refrigerant sensor 26 attached to the sensor attachment portion 23 of the T-shaped joint 14, the degree of decrease in the detected temperature of the thermistor 25 is detected, and the detection signal is sent to the control device. Output to.
- the control device estimates the flow rate of the refrigerant R flowing through the second bypass circuit 13 based on the detection signal, and thus estimates the flow rate of the refrigerant R flowing through the sixth pipe 2f.
- the control device can accurately measure the degree of temperature decrease due to the refrigerant R flowing through the T-shaped joint 14 with the thermistor 25, and can estimate the flow rate of the refrigerant R from the detected value as accurately as possible. It becomes possible.
- the refrigerant R that has flowed into the second heat exchanger 7 dissipates heat and liquefies (condenses) in the course of flowing therethrough.
- the second heat exchanger 7 functions as a condenser (condenser).
- the user uses the second heat exchanger 7 as a heater.
- the liquefied refrigerant R flows into the first heat exchanger 5 through the fifth pipe 2e, the expansion valve 6, and the fourth pipe 2d.
- the refrigerant R that has flowed into the first heat exchanger 5 evaporates here, and takes away the surrounding heat.
- the first heat exchanger 5 functions as an evaporator (evaporator).
- the refrigerant R evaporated and gasified in the first heat exchanger 5 is the third port 2c, the second port 4b of the four-way valve 4, the fourth port 4d, the seventh port 2g, the T-shaped joint 8, the eighth port. It passes through the pipe 2h and the accumulator 9, flows into the compressor 1 from the inlet 1b of the compressor 1, is compressed again, and is discharged from the discharge port 1a as high-temperature and high-pressure gas.
- self-heating is carried out by passing a current through the thermistor 25 of the refrigerant sensor 26 attached to the sensor attachment portion 23 of the T-shaped joint 8, and the degree of decrease in the detected temperature of the thermistor 25 is detected, and the detection signal Is output to the control device.
- the control device estimates whether or not liquid refrigerant is contained in the refrigerant R flowing through the T-shaped joint 8 based on the detection signal, and detects the liquid return of the refrigerant R returning to the compressor 1.
- the refrigerant sensor 26 having the thermistor 25 is configured to be attached to the sensor attachment portion 23 facing the first connection portion 22 of the main pipe portion 20 in each of the T-shaped joints 3, 8, 12, 14, the thermistor that is a detection element 25 can be brought into direct contact with the refrigerant R, and the physical quantity of the refrigerant R can be directly detected. Since the thermistor 25 is disposed so as to be accommodated in the sensor mounting portion 23, it is possible to prevent the thermistor 25 from obstructing the flow of the refrigerant R flowing through each of the T-shaped joints 3, 8, 12, and 14.
- the thermistor 25 is disposed between the first connecting portion 22 and the second connecting portion 24 at a portion where the refrigerant R changes its direction by 90 degrees. It is possible to detect an average physical quantity as accurately as possible, and the detection accuracy can be increased.
- the sensor attachment portion 23 side to which the refrigerant sensor 26 is attached is arranged so as to be higher than the first connection portion 22 side.
- the oil or liquid refrigerant in the refrigerant R can be prevented from accumulating.
- the thermistor 25 of the refrigerant sensor 26 can be hardly affected by the oil or liquid refrigerant, and the detection accuracy can be prevented from being lowered.
- the thermistor 25 that is a detection element can be relatively easily arranged at the center of the sensor mounting portion 23. This also makes it possible to increase the detection accuracy of the refrigerant sensor 26.
- the thermistor 25 can be protected.
- the flow of the refrigerant R is in the direction along the extending direction of the terminal 25a. It is difficult to apply a load and it is difficult to cause a disconnection.
- a force that shakes the thermistor 25 from the side is generated, and there is a possibility that disconnection is likely to occur. Can be prevented.
- the lead terminal 34 is inserted through the glass 35 in a state where the lead terminal 34 is passed through the base substrate 32.
- the step of hermetically fixing to the base substrate 32 is performed in a high-temperature firing furnace. By performing this process in a state where the thermistor 25 is not attached, it is possible to prevent the thermistor 25 from being damaged.
- the thermistor 25 By brazing only the adapter 30 to the sensor mounting portion 23, it is possible to prevent the thermistor 25 from being damaged by heat during brazing. Then, the terminal 25a of the thermistor 25 is connected to the lead terminal 34 fixed to the base substrate 32, and the thermistor 25 is unitized into the base substrate 32. Thereafter, the base substrate 32 is connected to the thermistor 25 in the sensor mounting portion 23.
- the thermistor 25 which is a detection element can be satisfactorily attached by being fixed to the opening 30a of the adapter 30 by laser welding while being inserted into the adapter 30.
- the present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
- the refrigeration cycle C is configured to be switchable between the cooling refrigerant circuit 10A and the heating refrigerant circuit 10B, but it is not always necessary to be able to switch.
- the refrigerant sensor 26 is provided at four locations, only one location may be used.
- the refrigerant sensor mounting structure according to the present invention is useful for detecting physical quantities (temperature, flow rate, liquid return) related to the refrigerant flowing in the piping of the refrigeration cycle.
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Abstract
Description
本発明は、上記した第2の目的を達成するために、円筒状をなし両端部が開口した主管部と、この主管部の軸方向の中間部から分岐し先端部が開口した円筒状をなす分岐管部とを有して全体としてT字形に形成され、前記主管部の一端部を冷凍サイクルの配管に接続する第1の接続部とし、前記主管部の他端部をセンサ取付部とし、前記分岐管部を前記配管に接続する第2の接続部とする金属製のT字形継手と、サーミスタを有し、このサーミスタが前記センサ取付部内に納まるようにして当該センサ取付部に気密に取り付けられる冷媒センサとを備え、前記冷媒センサを前記T字形継手の前記センサ取付部に取り付ける方法において、前記センサ取付部に円筒状をなす金属製のアダプタをろう付けにより固着する工程と、ベース基板にリード端子を貫通させた状態で、このリード端子をガラスを介して前記ベース基板に気密に固着する工程と、前記リード端子に前記サーミスタの端子を接続して前記サーミスタを前記ベース基板にユニット化する工程と、前記サーミスタをユニット化した前記ベース基板を、前記サーミスタを前記センサ取付部内に挿入する状態で前記アダプタの開口部にレーザー溶接により固着する工程とを含むことを特徴とする。
図面のうち、図1には冷房時における冷凍サイクルCの概略構成図を示し、図2には暖房時の冷凍サイクルCの概略構成図を示している。冷凍サイクルCは、図1に示す冷房用冷媒回路10Aと、図2に示す暖房用冷媒回路10Bとに切り替えが可能となっている。まず、主に図1の冷房用冷媒回路10Aを用いて冷凍サイクルCの概略構成を説明する。図1中、冷媒Rは、流通方向を示す破線の矢印で示す。
冷凍サイクルCを冷房として使用する場合には、図1に示すように、4方向弁4の第1ポート4aと第2ポート4bとが連通状態とされるとともに、第3ポート4cと第4ポート4dとが連通状態とされる。この状態で、コンプレッサ1が起動されると、コンプレッサ1において高温高圧のガスとなった冷媒Rが吐出口1aから吐出される。吐出口1aから吐出された冷媒Rは、第1配管2a、T字形継手3、第2配管2b、4方向弁4の第1ポート4a、第2ポート4b、第3配管2cを通って第1の熱交換器5に流れ込む。
一方、冷凍サイクルCを暖房として使用する場合には、図2に示すように、4方向弁4の第1ポート4aと第3ポート4cとが連通状態とされるとともに、第2ポート4bと第4ポート4dとが連通状態とされるように切り替えられる。この状態で、コンプレッサ1が起動されると、コンプレッサ1において高温高圧のガスとなった冷媒Rが吐出口1aから吐出される。吐出口1aから吐出された冷媒Rは、第1配管2a、T字形継手3、第2配管2b、4方向弁4の第1ポート4a、第3ポート4c、第6配管2fを通って第2の熱交換器7に流れ込む。
上記した実施形態によれば、次のような作用効果を得ることができる。
また、特にT字形継手3,8,12に設けた冷媒センサ26のサーミスタ25に対しては、冷媒Rの流れが端子25aの延び方向に沿った方向となるため、その端子25aの接続部分に負荷が掛かり難く、断線が発生し難くできる。ちなみに、サーミスタ25に対して冷媒Rの流れが横向きに加わると、サーミスタ25を横から揺するような力が発生し、断線が発生し易くなるおそれがあるが、本実施形態によれば、そのような不具合を防止することができる。
冷凍サイクルCは、冷房用冷媒回路10Aと暖房用冷媒回路10Bとに切り替えが可能な構成としたが、必ずしも切り替えが可能である必要はない。
Claims (3)
- 冷凍サイクル(C)の配管中を流れる冷媒(R)に係る物理量を検出するための冷媒センサ(26)の取付構造において、
円筒状をなし両端部が開口した主管部(20)と、この主管部の軸方向の中間部から分岐し先端部が開口した円筒状をなす分岐管部(21)とを有して全体としてT字形に形成され、前記主管部(20)の一端部を前記配管に接続する第1の接続部(22)とし、前記主管部の他端部をセンサ取付部(23)とし、前記分岐管部(21)を前記配管に接続する第2の接続部(24)とするT字形継手(3,8,12,14)と、
サーミスタ(25)を有し、このサーミスタが前記センサ取付部(23)内に納まるようにして当該センサ取付部に気密に取り付けられた冷媒センサ(26)とを備え、
前記T字形継手(3,8,12,14)の前記第1の接続部(22)および前記第2の接続部(24)を前記配管に接続した状態で、前記主管部(20)の前記センサ取付部(23)側を前記第1の接続部(22)側より高く配置したことを特徴とする冷媒センサ(26)の取付構造。 - 請求の範囲第1項に記載の冷媒センサ(26)の取付構造において、
前記冷媒センサ(26)に、前記サーミスタ保護用のフィルタ(31)を設けたことを特徴とする冷媒センサ(26)の取付構造。 - 円筒状をなし両端部が開口した主管部(20)と、この主管部の軸方向の中間部から分岐し先端部が開口した円筒状をなす分岐管部(21)とを有して全体としてT字形に形成され、前記主管部(20)の一端部を冷凍サイクル(C)の配管に接続する第1の接続部(22)とし、前記主管部の他端部をセンサ取付部(23)とし、前記分岐管部(21)を前記配管に接続する第2の接続部(24)とする金属製のT字形継手(3,8,12,14)と、
サーミスタ(25)を有し、このサーミスタが前記センサ取付部(23)内に納まるようにして当該センサ取付部に気密に取り付けられる冷媒センサ(26)とを備え、
前記冷媒センサ(26)を前記T字形継手(3,8,12,14)の前記センサ取付部(23)に取り付ける方法であって、
前記センサ取付部(23)に円筒状をなす金属製のアダプタ(30)をろう付けにより固着する工程と、
ベース基板(32)にリード端子(34)を貫通させた状態で、このリード端子をガラス(35)を介して前記ベース基板に気密に固着する工程と、
前記リード端子(34)に前記サーミスタ(25)の端子(25a)を接続して前記サーミスタを前記ベース基板(32)にユニット化する工程と、
前記サーミスタ(25)をユニット化した前記ベース基板(32)を、前記サーミスタを前記センサ取付部(23)内に挿入する状態で前記アダプタ(30)の開口部にレーザー溶接により固着する工程とを含むことを特徴とする冷媒センサ(26)の取付方法。
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JP2016008048A (ja) * | 2014-06-20 | 2016-01-18 | 日立オートモティブシステムズメジャメント株式会社 | 燃料供給装置 |
JP2016190658A (ja) * | 2015-03-31 | 2016-11-10 | 日立オートモティブシステムズメジャメント株式会社 | 液体燃料供給装置 |
JP2019100365A (ja) * | 2017-11-28 | 2019-06-24 | 大陽日酸株式会社 | 水素ステーション |
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JP2016008048A (ja) * | 2014-06-20 | 2016-01-18 | 日立オートモティブシステムズメジャメント株式会社 | 燃料供給装置 |
JP2016190658A (ja) * | 2015-03-31 | 2016-11-10 | 日立オートモティブシステムズメジャメント株式会社 | 液体燃料供給装置 |
JP2019100365A (ja) * | 2017-11-28 | 2019-06-24 | 大陽日酸株式会社 | 水素ステーション |
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