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公开(公告)号：JPH0989390A
公开(公告)日：1997-04-04
申请号：JP25272995
申请日：1995-09-29
Applicant: MATSUSHITA REFRIGERATION
Inventor： AOYAMA SHIGEO , MACHIDA KAZUHIKO , HIROSE KENJI , NISHIO YASUNORI
Abstract: PROBLEM TO BE SOLVED: To improve the controllability of the refrigerant circulating amount of the user side refrigerating cycle of a multi-room split air conditioner. SOLUTION: The air conditioner comprises a first refrigerant conveying pump 9a having a variable operating frequency, two second refrigerant conveying pumps 9b having a predetermined operating frequency, a refrigerant conveying pump suction pressure detector 16, and a first pump flow controller 17, wherein the controller 17 so sets the number (n) of the pumps 9b and the operating frequency (f) of the pump 9a that the suction pressure Ps falls within a predetermined range.
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公开(公告)号：JPH0989388A
公开(公告)日：1997-04-04
申请号：JP24904095
申请日：1995-09-27
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKAGAWA NOBUHIRO , NAKATANI KAZUO , NISHIO YASUNORI
Abstract: PROBLEM TO BE SOLVED: To realize excellent distribution of the refrigerant of indoor units by judging the opening of an indoor side expansion valve from the calculation result of a supercooling degree calculating means to calculate the difference between the calculation result of a saturated liquid temperature calculating means and the detected result of a first temperature sensor, and operating the indoor side expansion valve from the output signal. SOLUTION: In the heating operation when the non-azeotrope refrigerant is used, the condensation pressure is calculated with the saturated liquid temperature and the saturated gas temperature as the center temperature of indoor side heat exchangers 8a, 8b. The difference between the saturated liquid temperature calculated from the pressure and the outlet temperature of the indoor side heat exchangers 8a, 8b, i.e., the supercooling degree is calculated and the supercooling degree is compared with the prescribed cooling degree. Indoor side expansion valves 9a, 9b can appropriately be controlled thereby, deterioration of the refrigerant distribution between indoor units can be prevented irrespective of the installation conditions such as the long piping and the difference in height, and the capacity of the indoor unit can appropriately be controlled.
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公开(公告)号：JPH08334274A
公开(公告)日：1996-12-17
申请号：JP14230595
申请日：1995-06-09
Applicant: MATSUSHITA ELECTRIC IND CO LTD , MATSUSHITA REFRIGERATION
Inventor： NAKATANI KAZUO , NAKAGAWA NOBUHIRO , NISHIO YASUNORI
IPC: F25B13/00
Abstract: PURPOSE: To provide an air conditioner which can prevent a frosting from generating in the vicinity of an inlet for a refrigerant of an outdoor heat- exchanger at the time of a heating operation for the air conditioner using a non-azeotropy mixed refrigerant. CONSTITUTION: At the time of a heating operation, a refrigerant which has passed an outdoor expansion valve 26 flows into a heat-exchanging unit 23 by the action of a first check valve, and heat-exchanges a refrigerant which has just passed an outdoor heat-exchanger 25. In the meantime, at the time of a cooling operation, the refrigerant which has just passed the outdoor heat- exchanger 25 is directly introduced to the outdoor expansion valve without being introduced to the heat-exchanging unit 23 by the action of a second check valve 28.
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公开(公告)号：JPH08178436A
公开(公告)日：1996-07-12
申请号：JP31658294
申请日：1994-12-20
Applicant: MATSUSHITA REFRIGERATION
Inventor： NAKAGAWA NOBUHIRO , NISHIO YASUNORI
IPC: F25B1/00
Abstract: PURPOSE: To provide a multi-room type cooler/heater in which suitable indoor unit capacity control can be conducted in a cooling operation using non- azeotrope refrigerant. CONSTITUTION: The multi-room type cooler/heater comprises temperature detecting means 18a, 18b for detecting the temperatures of the inlets and outlets of indoor side heat exchangers 7a, 7b, temperature difference calculating means 19a, 19b for calculating the difference of the detected temperatures, indoor side expansion valve opening deciding means 20a, 20b for deciding the openings of indoor side expansion vales 8a, 8b based on the calculated result, and indoor side expansion valve operating means 21a, 21b for operating the valves 8a, 8b based on the outputs of the means 20a, 20b.
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公开(公告)号：JPH0682111A
公开(公告)日：1994-03-22
申请号：JP23676892
申请日：1992-09-04
Applicant: MATSUSHITA REFRIGERATION
Inventor： NISHIO YASUNORI , KINO AKIHIRO
Abstract: PURPOSE:To prevent into a refrigerant before room side electric expansion values from being formed into a double phase by controlling the openings of the room side electric expansion valves to be adapted to changing characteristics of overheating levels when the overheating levels of outlet pipings at a plurality of room machines all exceed a specified value. CONSTITUTION:In this multi-room type air-conditioning apparatus, a plurality of room machines 6 (a-c) are connected in parallel to an outdoor machine 1. Here, the room machines 6 are the same in structure. For example, in the room machine 6a, the opening of a room side electric expansion valve 7a is computed by a first means 12a based on a room temperature detected by the means 9a and the temperature set by a means 10a. The opening of the expansion valve 7a is computed by a second means 13a to match changing characteristics of overheating levels when a refrigerant is cooled excessively. Moreover, the opening of the expansion valve 7a is computed by a third means 19a to match changing characteristics of overheating levels in a double-phase condition of the refrigerant. A switching is performed by a means 21a to the control by the third means 19a when an overheating level protection signal is outputted from a means 20 of the outdoor machine 1 and to the control by the second means 13a in other cases.
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Patent Agency Ranking
公开(公告)号：JPH0611172A
公开(公告)日：1994-01-21
申请号：JP16713492
申请日：1992-06-25
Applicant: MATSUSHITA REFRIGERATION
Inventor： NISHIO YASUNORI , KINO AKIHIRO
Abstract: PURPOSE:To prevent a room temperature from being disturbed and contrive an energy saving by a method wherein a degree of opening of an indoor electrical expansion valve and a frequency of a compressor having a variable capability are controlled in such a manner that over-heating and over-cooling of refrigerant are not produced. CONSTITUTION:The first target degree of opening of each of the indoor electrical expansion valves 27a to 27c is calculated by the first target degree of opening calculating means 32 in response to a deviation between the room temperatures detected by room temperature sensing means 29a to 29c and the target temperatures set by temperature setting means 30a to 30c. The second target degree of opening of each of the indoor electrical expansion valves 27a to 27c is calculated by the second target degree of opening calculating means 33 in response to a degree of over-heating of outlet pipes of the indoor heat exchangers 31a to 31c detected by the over-heating degree sensing means 28a to 28c. A fuzzy inference is carried out in response to these results, over-heating degrees detected by the over-heating degree sensing means 28a to 28c and a control rule taken out of the memory device 35 and then the degree of opening of each of the indoor electrical expansion valves 27a to 27c is determined in response to the result of the inference. A frequency of each of the compressors 22a and 22b having a variable capability is determined by comparing it with the predetermined frequency. With such an arrangement as above, each of the indoor units is controlled in response to the most-suitable degree of opening and the most-suitable frequency.
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公开(公告)号：JPH05118679A
公开(公告)日：1993-05-14
申请号：JP28262691
申请日：1991-10-29
Applicant: MATSUSHITA REFRIGERATION
Inventor： HIROSE KENJI , NISHIO YASUNORI , KURACHI MASAO
Abstract: PURPOSE:To restrain the inflow of liquid refrigerant into a refrigerant pump by a method wherein the opening and/or closing of four solenoid valves, arranged in an user side heat exchanger, a second auxiliary heat exchanger and between the inlet side and the outlet side of the refrigerant pump, are controlled through predetermined combinations in accordance with cooling and heating. CONSTITUTION:A fuzzy reasoning means 23 effects fuzzy logical operation by the information from a differentiating means 20, operating the change rate of driving current of a refrigerant pump 10, a cooling and heating modes detecting means 18 and a difference of electric current operating means 19 and the control rule of a memory device 22 to determine the opening degree of user side solenoid valves 11-14. In this case, the first solenoid valve 11 between the outlet port of the refrigerant pump 10 and a user side heat exchanger 8 and the third solenoid valve 13 between the inlet port of the refrigerant pump 10 and a second auxiliary heat exchanger 7 are controlled upon room cooling. Upon room heating, the second and fourth solenoid valves 12, 14 are controlled.
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公开(公告)号：JPH05118623A
公开(公告)日：1993-05-14
申请号：JP28263291
申请日：1991-10-29
Applicant: MATSUSHITA REFRIGERATION
Inventor： NISHIO YASUNORI , KURACHI MASAO , HIROSE KENJI
Abstract: PURPOSE:To provide a cooling and heating device in which a refrigerant pump is protected and the most suitable amount of refrigerant is supplied under the control of a degree of opening or closing of a solenoid valve of a utilizer's refrigerant cycle and the degree of opening or closing of the solenoid valve of the utilizer's refrigerant cycle is smoothly controlled without any disturbance. CONSTITUTION:A cooling and heating device is comprised of a cooling or heating mode sensing means 18, a temperature difference operation means 19, a differential means 20 for operating a variation rate of temperature DELTAC in respect to time, a memory device 22 for storing a control rule based on a rule of thumb for judging a changing-over of the solenoid valve, a fuzzy inference means 23 for performing a fuzzy logical operation in response to values of the temperature difference operation means 19 and the differential means 20 and a control rule taken out of the memory device 22, and a solenoid valve opening or closing driving means 24 for controlling a degree of opening or closing the utilizer's solenoid valve and driving it in response to the value determined by the fuzzy inference means 23.
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公开(公告)号：JPH04316961A
公开(公告)日：1992-11-09
申请号：JP8509891
申请日：1991-04-17
Applicant: MATSUSHITA REFRIGERATION
Inventor： NISHIO YASUNORI , OGAWA KEIJI , HAMAOKA KOJI , KAKITA KENICHI
Abstract: PURPOSE:To provide a control device for an air-conditioner which sets a delivery pipe temperature for protection of a compressor to a value approximately similar to a delivery pipe maximum allowable temperature, uses the power element of an inverter circuit, through which the compressor is driven, to maximum capacity to prevent forced down of a system and increases a compressor running time, and prevents the generation of a load owing to repetition of operation and the stop of the compressor. CONSTITUTION:A control device for an air-conditioner having an inverter to control the number of revolutions of a compressor comprises a temperature detecting means 9 to detect the delivery pipe temperature of a compressor 8, a detecting temperature deciding means 15 to decide a detecting delivery pipe temperature, and an operation frequency deciding means 14 to input a signal from the detecting temperature deciding means 15 and decide the operation frequency of the compressor.
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公开(公告)号：JPH04312362A
公开(公告)日：1992-11-04
申请号：JP7920391
申请日：1991-04-11
Applicant: MATSUSHITA REFRIGERATION
Inventor： OGAWA KEIJI , HAMAOKA KOJI , KAKITA KENICHI , NISHIO YASUNORI
Abstract: PURPOSE:To detect the voltage accurately and precisely with a voltage detection means regardless of charge or discharge of a capacitor, to secure the protection of an inverter against undervoltage surely, and to confirm that the protection against undervoltage is not applied to the inverter within the range of operating voltage of it, in a controller for an air conditioner equipped with an inverter. CONSTITUTION:This controller comprises a voltage detection means 12', which detects the voltage of a capacitor 7, and a voltage changeover means 20, which changes over the voltage of the capacitor, interlocking with the signal S3 outputted from a relay driving circuit 13 to a current limiting relay 5.
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