公开(公告)号：JPH04194555A

公开(公告)日：1992-07-14

申请号：JP32310990

申请日：1990-11-28

Applicant: MATSUSHITA REFRIGERATION

Inventor： NAKAGAWA NOBUHIRO ,  KITAYAMA HIROSHI ,  KINO AKIHIRO ,  FUJIMOTO RYUZO ,  TAKATANI TAKAYUKI

IPC: F25B5/02

Abstract: PURPOSE:To keep cooling-capacity proper, by a method wherein in the time of cooling, a mean value for the degree of subcooling in each indoor machine is compared with the degree thereof preset, the amount of the heat-exchange of a liquid pipe for a gas pipe is regulated by a regulating means for the amount thereof, and the degree thereof is controlled at a specified value. CONSTITUTION:In the time of cooling, a high temperature gas with high pressure compressed by a compressor 3 is turned into a liquid refrigerant with the high pressure by a heat- exchanger 5 on the side of an outdoor machine, and the liquid refrigerant passes an expansion valve 6 on the side thereof, and its flow is divided into a bypass 11a and the liquid pipe 11. After the liquid refrigerant passing a liquid-to-gas heat-exchanger 14 is cooled with a gaseous refrigerant in a gas pipe 12a on the side of suction, it again joins in the liquid pipe 11 and flows into indoor machines 2a, 2b. The pressure of the liquid refrigerant is reduced by expansion valves 8a, 8b on the side of indoor machines and the heat-exchange of the liquid refrigerant for the indoor air is done by heat-exchangers 9a, 9b on the indoor side, so that the liquid refrigerant is turned into a low temp. gas with low pressure, and the gaseous refrigerant returns to the compressor 3 through a gas pipe 12. For the control of the degree of subcooling, time degree of subcooling of the liquid refrigerant is detected by detectors 20a, 20b and a mean value is calculated in an operation circuit 21. In a deciding circuit 22, the mean value is compared with the degree thereof preset, a regulating valve 13 is regulated by a regulator 23, a refrigerant flow rate in the heat-exchanger 14 is regulated, and the degree of subcooling is controlled at a specified value.

公开(公告)号：JPH04190053A

公开(公告)日：1992-07-08

申请号：JP31811090

申请日：1990-11-26

Applicant: MATSUSHITA REFRIGERATION

Inventor： FUJIMOTO RYUZO ,  KITAYAMA HIROSHI ,  KINO AKIHIRO ,  NAKAGAWA NOBUHIRO ,  TAKATANI TAKAYUKI

IPC: F25B13/00

Abstract: PURPOSE:To enable a normal operation pressure state to be always kept even during a heating operation by a method wherein an outdoor device is provided with the second four-way valve, and refrigerant is circulated from an expansion valve of an indoor device toward a heat exchanger at the indoor device during cooling and heating operations. CONSTITUTION:A solenoid four-way valve 13a is inserted into an outlet of a liquid pipe 11 and an outlet of an outdoor device 1. During a heating operation, for example, only an indoor device is operated, the four-way valve 13a is electrically energized,resulting in that gas of high temperature and high pressure passes through conduits 13d and 13c, is heat exchanged at an indoor device heat exchanger 9d, condensed there, passes through a conduit 13e and a conduit 13b. A pressure of the gas is reduced by an expansion valve 5 at the outdoor device and the gas returns to the compressor 2. At this time, since the expansion valves 8a, 8b and 8c at the indoor devices 7a, 7b and 7c are all closed under their stopped conditions, the gas of high temperature and high pressure passed through the conduit 13c is not fed into the heat exchangers 9a, 9b and 9c at the indoor devices. Accordingly, even if the heating conditions are varied, the device can be always operated at a proper operating pressure.

公开(公告)号：JPH04116347A

公开(公告)日：1992-04-16

申请号：JP23680090

申请日：1990-09-05

Applicant: MATSUSHITA REFRIGERATION

Inventor： KITAYAMA HIROSHI ,  NAKAGAWA NOBUHIRO ,  FUJIMOTO RYUZO ,  TAKATANI TAKAYUKI

IPC: F25B5/02

Abstract: PURPOSE:To urn the title air conditioner and prevent the capability drop of an indoor machine which is installed at a high position, by opening the indoor side expanding valve of the indoor machine which is installed at a high position more than that of the indoor machine which is installed at a low position. CONSTITUTION:Among more than one indoor machines, the indoor machine 7a which is installed at high position has a indoor side expanding valve 14, indoor side heat transformation device 9a, indoor side fan 10a and a valve opening control device; the indoor machine 16 which is installed at a low position has a indoor side expanding valve 16, an indoor side heat transformation device 9b, an indoor side fan 10b and also a valve opening control device. When the air conditioners run in cooling mode, because the installation position of the indoor machine 7a is higher than that of the indoor machine 7b, a pressure drop corresponding to the liquid column of differential head occurs in the refrigerant before the indoor side expanding valve. Hence, the opening compensation device of the indoor machine 1a calculates the degree of throttling S which is needed to compensate the pressure difference caused by the difference of installation position. The degree of valve opening of the indoor side expanding valve 14 is always set to be larger by an amount S than that of the indoor side expanding valve 16.

公开(公告)号：JPH0436521A

公开(公告)日：1992-02-06

申请号：JP14096490

申请日：1990-05-30

Applicant: MATSUSHITA REFRIGERATION

Inventor： NAKAGAWA NOBUHIRO ,  NODA TOSHINORI ,  SHIMOMURA NOBUO ,  NAKANO AKIRA

IPC: F24F1/00

Abstract: PURPOSE:To achieve pleasant air conditioning giving more warmth to the lower part of the human body then to the upper part and being free of flowing air causing the occupant an unpleasant feeling by forming a lower outlet leading to a space formed by a double floor under the room and by providing at an end of the double floor a vent leading to the room. CONSTITUTION:In heating, the indoor air sucked into an inlet 30 undergoes heating by a heat exchanger 18 and then is sent into an air duct 24 by a blower 21; at this time, since the air is ejected at temperatures above 30 deg.C, a spring 28 expands along a spring guide 29 with an effect to push a damper 27 upward; as a result, warm air flows downward through the air duct 24, through a lower outlet 23 into a space 32 formed by a double floor 31 under the room, through the space 32 and then into the room through a vent 33. In cooling, the indoor air sucked into the inlet 30 undergoes cooling by the heat exchanger 18 and then is sent into the air duct 24 by the blower 21; at this time, since the air is ejected at temperature blow 30 deg.C, the spring 28 contracts along the spring guide 29 with an effect to pull the damper 27 downward; as a result, cool air flows upward through the air duct 24, flows out through an upper outlet 22, and after impinging against the ceiling 12, descends spreading in the room.

公开(公告)号：JPH03271659A

公开(公告)日：1991-12-03

申请号：JP6886890

申请日：1990-03-19

Applicant: MATSUSHITA REFRIGERATION

Inventor： KITAYAMA HIROSHI ,  KINO AKIHIRO ,  NAKAGAWA NOBUHIRO ,  FUJIMOTO RYUZO ,  TAKATANI TAKAYUKI

IPC: F25B13/00

Abstract: PURPOSE:To prevent dropdown of capacity by a method wherein a heat exchanging means is provided for heat exchanging between a liquid pipe and a gas pipe of a high positioned room unit among a plurality of room units so that, even when the room units are positioned differently in the height, the refrigerant before a room unit side expansion valve of every room unit is turned into liquid phase. CONSTITUTION:In a multi-room air conditioner, for example, an outdoor unit 1 is arranged on the ground, another room unit 7a is on the fourth floor, and a further room unit 7b is on the first floor. During cooling operation, high temperature and high pressure gas compressed by a compressor 2 is led through a fourway valve 3 and condensed by an outdoor side heat exchanger 4 into a liquid refrigerant of high pressure, which passes through a liquid pipe 11 and, with the room unit 7a, flows into a heat exchanging means 14 and a room side expansion valve 8a, and with the room unit 7b, flows into a room side expansion valve 8b. During heating operation, the high temperature and high pressure gas compressed by the compressor 2 is led though the fourway valve 3 and, with the room unit 7a, flows to the upstream side of the heat exchanging means 14, and with the room unit 7b, flows into the room side heat exchanger 9b. Thus, if the outdoor unit is arranged low and the room unit is high, a liquid-gas heat exchanging means is provided for increasing subcooling degree during the cooling operation in the high positioned room unit, so that both cooling and heating operations can be obtained without dropdowns of capacity.

公开(公告)号：JPH03251665A

公开(公告)日：1991-11-11

申请号：JP4762790

申请日：1990-02-28

Applicant: MATSUSHITA REFRIGERATION

Inventor： KINO AKIHIRO ,  KITAYAMA HIROSHI ,  NAKAGAWA NOBUHIRO ,  FUJIMOTO RYUZO ,  TAKATANI TAKAYUKI

IPC: F25B1/00 ,  F25B13/00

Abstract: PURPOSE:To prevent a rise operation from being prolonged and also a shortage of capacity by a method wherein the capacity control of a variable capacity compressor is conducted, through an inverter, on the basis of a pressure detected by a pressure sensor from the time point when the degree of overheating of a refrigerant detected at the time of a cooling rise operation becomes a prescribed degree of overheating or below. CONSTITUTION:An outdoor-unit controlling means 15 conducts the capacity control of a variable capacity compressor 2 through an inverter 12 on the basis of a pressure detected by a pressure sensor 11 from the time point when the degree of overheating of a refrigerant detected by a refrigerant overheating degree detector 13 at the time of a cooling rise operation becomes a prescribed degree of overheating or below. In other words, the reverse response of a cycle is detected by detecting the degree of overheating of the refrigerant at the outlet of an outdoor-side heat exchanger at the time when a cooling operation is started, the capacity control of the variable capacity compressor 2 is not executed during the time, and the capacity control is started on detection of the completion of the reverse response. According to this constitution, comfortableness at the rise time is increased and, moreover, a fault of the compressor due to a shortage of the quantity of the refrigerant in circulation can be prevented.

公开(公告)号：JPH03251664A

公开(公告)日：1991-11-11

申请号：JP4762090

申请日：1990-02-28

Applicant: MATSUSHITA REFRIGERATION

Inventor： KINO AKIHIRO ,  KITAYAMA HIROSHI ,  NAKAGAWA NOBUHIRO ,  FUJIMOTO RYUZO ,  TAKATANI TAKAYUKI

IPC: F25B1/00 ,  F25B13/00

Abstract: PURPOSE:To improve a rise property and to increase comfortableness by a method wherein the capacity control of a capacity-variable compressor is conducted, through an inverter, on the basis of a pressure detected by a pressure sensor from the time point when the degree of excessive cooling of a refrigerant detected at the time of a cooling rise operation becomes a prescribed degree of excessive cooling or above. CONSTITUTION:At the time when a cooling operation is started, the degree of excessive cooling of a refrigerant at the outlet of an outdoor-side heat exchanger 4 is detected by a detector 13. From the time point when this degree of excessive cooling of the refrigerant becomes a prescribed degree of excessive cooling or above, the capacity of a variable capacity compressor 2 is controlled by an outdoor-unit controlling means 15 through an inverter 12 on the basis of a pressure detected by a pressure sensor 11. Thereby comfortableness at the rise time is increased and a fault of the compressor 2 due to a shortage of the quantity of the refrigerant in circulation is prevented.

公开(公告)号：JPH03230028A

公开(公告)日：1991-10-14

申请号：JP2653090

申请日：1990-02-06

Applicant: MATSUSHITA REFRIGERATION

Inventor： NODA TOSHINORI ,  NAKAGAWA NOBUHIRO ,  SHIMOMURA NOBUO

IPC: F24F1/00 ,  F24F11/02

Abstract: PURPOSE:To raise the temperature in a room to a set temperature quickly at the starting time of heating operation by a method wherein the title air conditioner is provided with a blowing port switching device which changes over upper and lower blowing ports, upper and lower room temperature detecting devices which are provided on the front surface of an indoor unit, blowing air quantity distributing device which distributes blowing air and a ventilation port which communicates with the inside of the room at the end of a double floor. CONSTITUTION:An upper room temperature TU is detected by an upper room temperature detecting device 38. When the upper room temperature TU and a set temperature Tset satisfy TU>Tset-2, and the upper room temperature TU and lower room temperature TD satisfy TU-TD>5, hot air is blown out from a ventilation port 37. When they are not satisfied, i.e., when a temperature detected by the upper room temperature detecting device 38 is widely different from the set temperature, or when a difference between an upper room temperature and lower room temperature is large, by operating a damper 32, a lower space 36 is closed, and hot air is blown out from a front blow-out port 34 only to warm a living area 24, and air is drawn from an upper blow-out port 30. In the meantime, when the room temperature is sufficiently close to the set temperature, and a difference in temperature between the room upper part and lower part is large, by operating the damper 32, an air passage 33 is closed, and hot air blown out from a blow-out port 31 passes through the lower space 36, blows out from the ventilation port 37, warms a double floor 35, and warms the living area 24 from the bottom.

公开(公告)号：JPH03213962A

公开(公告)日：1991-09-19

申请号：JP1143690

申请日：1990-01-19

Applicant: MATSUSHITA REFRIGERATION

Inventor： FUJIMOTO RYUZO ,  KITAYAMA HIROSHI ,  KINO AKIHIRO ,  NAKAGAWA NOBUHIRO ,  TAKATANI TAKAYUKI ,  SATO MITSUHIRO

IPC: F25B13/00

Abstract: PURPOSE:To enable a cooling operation to be carried out even under a low surrounding air temperature condition in winter season by a method wherein a liquid pipe between an outdoor expansion valve and an indoor expansion valve and a part between a four-way valve and an outdoor heat exchanger are connected by a bypassing circuit having an electrical expansion valve arranged therein. CONSTITUTION:In the event that a condensing pressure is further lower than a set value even under a low surrounding air temperature, an outdoor expansion valve 5 is metered to cause a flow rate of refrigerant flowing in the outdoor heat exchanger 4 to be reduced and then a flow rate of refrigerant flowing in the bypassing circuit 16 is controlled to be increased. Then, further since the condensing capability at the outdoor heat exchanger 4 is reduced, the condensing pressure is increased. Even in this case, a mixing device 15 has a sufficient capacity, so that the high pressure gas and the liquid refrigerant are rapidly and completely mixed to each other in the mixing device 15 and then a transient phenomenon may not occur.

公开(公告)号：JPH03213920A

公开(公告)日：1991-09-19

申请号：JP1143290

申请日：1990-01-19

Applicant: MATSUSHITA REFRIGERATION

Inventor： NODA TOSHINORI ,  NAKAGAWA NOBUHIRO

IPC: F24F1/00 ,  F24F11/04

Abstract: PURPOSE:To circulate conditioned air through the whole room and thereby to improve a temperature distribution sharply by a construction wherein the quantity of warm or cool air to be blown off from an upper outlet of an indoor device and a lower outlet thereof communicating with a lower space of a double floor is made adjustable by flow division in accordance with an indoor load. CONSTITUTION:Outlets 31 and 32 are provided in the upper and lower parts of an indoor device 25 having a blower 28 incorporated, respectively, while a blowoff flow dividing means 30 which can change the division ratio between the quantities of air to be blown off from these upper and lower outlets is provided in an air passage 33. The lower outlet 32 is made to communicate with a lower space of a double floor 39 and a vent hole 41 communicating with the inside of a room is provided in the end part of the space. Moreover, an inlet changeover means 37 enabling selection of a first inlet 35 opening in the front of the main body 25 of the indoor device or a second inlet 36 opening on the lower side of the main body and communicating with the lower space 40 of the double floor 39, in accordance with an operation mode, is provided. According to this constitution, cool air is blown off from the upper outlet 31, in cooling, and also sucked in from the vent hole 41 of the floor to be circulated through the room by making the changeover means 37, while whole warm air is blown off from the upper outlet 31 by the flow dividing means 30, in heating, so that the inside of the room can be warmed sufficiently.