公开(公告)号：JPH07208828A

公开(公告)日：1995-08-11

申请号：JP566394

申请日：1994-01-24

Applicant: MATSUSHITA REFRIGERATION

Inventor： NAKAGAWA NOBUHIRO

IPC: F24F11/02 ,  F25B1/00 ,  F25B13/00 ,  F25B30/02

Abstract: PURPOSE:To provide a multi-room cooler/heater in which an existing heat source such as an absorption type cold/warm water machine is efficiently combined to be individually dispersed and air-conditioned. CONSTITUTION:The multi-room cooler/heater comprises a heat source side refrigerant cycle in which a compressor 1, a heat source side heat exchanger 3, a pressure reducing unit and a first auxiliary heat exchanger 8 are annularly connected, a user side refrigerant cycle in which a second auxiliary heat exchanger 9 to be heat exchanged integrally with the exchanger 8, a refrigerant conveyor 11, user side heat exchangers 12a, 12b, and a third auxiliary heat exchanger 13 to be heat exchanged integrally with other heat source using heat exchanger 14 for feeding cold/warm water are annularly connected, and time detecting means 18. Further, the cooler/heater comprises other heat source usage deciding means 19 for deciding whether other heat source can be used or not based on an output signal of the detecting means, switching means 20 for switching a refrigerant circuit based on the output signal of the deciding means, and actuator driving means 21 for driving the compressor 1, etc.

公开(公告)号：JPH06337152A

公开(公告)日：1994-12-06

申请号：JP12571793

申请日：1993-05-27

Applicant: MATSUSHITA REFRIGERATION

Inventor： NAKAGAWA NOBUHIRO ,  KURACHI MASAO

IPC: F24F5/00 ,  F24F11/02 ,  F25B1/00 ,  F25B13/00 ,  F25B29/00

Abstract: PURPOSE:To provide a multiroom cooling/heating device which prevents the operation of protecting the discharge pressure by suppressing the increase of the discharge pressure during cooling overload operation and provides a given cooling capacity during a summer season when cooling is needed most. CONSTITUTION:A multiroom cooling/heating device comprises a refrigerant cycle on the heat source side wherein a compressor 1, a four-way valve 2, a heat-exchanger 4 on the heat source side, a pressure reducing device 5, a first auxiliary heat-exchanger 6, and a third auxiliary heat-exchanger 3 are circularly interconnected; and a refrigerant cycle on the first utilization side wherein a second auxiliary heat-exchanger 7 formed integrally with the first auxiliary heat-exchanger 6 to perform heat-exchange, a first refrigerant conveying device 8, and heat-exchangers 12a and 12b on the first utilization side are circularly interconnected. Further, the multiroom cooling/heating device is provided with a refrigerant cycle on the second utilization side wherein a fourth auxiliary heat-exchanger 9 formed integrally with a third auxiliary heat- exchanger 3, a second refrigerant conveying device 10, and heat-exchangers 16a and 16b on the second utilization side, are circularly interconnected, an operation mode detecting means 21, a pressure detecting means 22, a cooling overload deciding means 23, and an actuator drive means 24.

公开(公告)号：JPH0611205A

公开(公告)日：1994-01-21

申请号：JP16731892

申请日：1992-06-25

Applicant: MATSUSHITA REFRIGERATION

Inventor： NAKAGAWA NOBUHIRO ,  KURACHI MASAO ,  MARUMOTO KAZUHIKO

IPC: F25B13/00

Abstract: PURPOSE:To obtain an air conditioning apparatus where gas injection can be used without spoiling the reliability of a compressor even when the outdoor load fluctuates during air conditioning operation. CONSTITUTION:An air conditioning apparatus is provided with an outside temperature detector 21 which detects the outside temperatures, an intermediate pressure detector 22 which detects the intermediate pressure of a gas-liquid separator 14, an air conditioning mode judging device 24 which judges cooling or heating operation mode, a set intermediate pressure arithmetic device 25 which does arithmetic of set intermediate pressure based on the outside temperatures. In addition, an intermediate pressure judging device 26 which compares the arithmetic result with the intermediate pressure to judge, a pressure reducing amount decision device 27 which decides the pressure reducing amount of a pressure reducing device 15 for air conditioning corresponding to the judgment result, and a pressure reducing device driver 28 which drives the pressure reducing device 15 for air conditioning corresponding to the pressure reducing amount are provided.

公开(公告)号：JPH0571814A

公开(公告)日：1993-03-23

申请号：JP23282291

申请日：1991-09-12

Applicant: MATSUSHITA REFRIGERATION

Inventor： TAKAHASHI TAKAHIRO ,  NAKAGAWA NOBUHIRO ,  KURACHI MASAO

IPC: F24F5/00 ,  F25B1/00

Abstract: PURPOSE:To obtain a heating and cooling apparatus preventing a short circuit in a use-side four-way valve when the next heating operation is started and the stoppage of a system by high pressure cutting by positively turning the pilot type use-side four-way valve OFF when heating operation is stopped. CONSTITUTION:Stoppage from heating operation is detected by a heating-cooling stoppage detecting means, and pressure difference on the delivery side and suction side of a refrigerant pump 8 is detected by a differential-pressure detecting means 26. When whether or not pressure difference reaches the proof differential pressure or more of a use-side four-way valve 9 is decided by a differential-pressure decision means 27 and the pressure difference is lower than the proof differential pressure, an indoor flow valve 22 is driven by an indoor flow-valve driving means 28 as the operation of the refrigerant pump 8 is left as it is continued until the pressure difference is made lower. A compressor 1 and a heat-source side four-way valve 2 are driven by a heat-source side equipment driving means 18 and the use-side four-way valve 9 and the refrigerant pump 8 by a use-side equipment driving means, thus stopping a system.

公开(公告)号：JPH04278133A

公开(公告)日：1992-10-02

申请号：JP4156391

申请日：1991-03-07

Applicant: MATSUSHITA REFRIGERATION

Inventor： MACHIDA KAZUHIKO ,  KITAYAMA HIROSHI ,  NAKAGAWA NOBUHIRO

IPC: F24F5/00 ,  F25B13/00

Abstract: PURPOSE:To provide a multi-chamber cooler/heater for always stabilizing a system and efficiently operating by suitably branching refrigerant from an indoor unit to an outdoor unit. CONSTITUTION:A compressor 1, a four-way valve 2, a heat source side exchanger 3, pressure reducing units 4, 5, check valves 6, 7, and a first auxiliary heat exchanger 8 are annularly connected to form a heat source side refrigerant cycle. A second auxiliary heat exchanger 9 so formed integrally as to heat exchange with the exchanger 8, a refrigerant amount regulating tank 10, a refrigerant conveyor 11, user side heat exchangers 12a, 12b, connecting tubes (i, i', j, j)', a gas/liquid separator 13, a header 14, and a distributor 15 are annularly connected to form a user side refrigerant cycle.

公开(公告)号：JPH04190056A

公开(公告)日：1992-07-08

申请号：JP32357790

申请日：1990-11-26

Applicant: MATSUSHITA REFRIGERATION

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

IPC: F25B13/00

Abstract: PURPOSE:To prevent refrigerant from being accumulated within an indoor device and enable a stable operating state to be kept by a method wherein a degree of opening of an expansion valve of an indoor being stopped in its operation or in a thermo- off state for every time during a heating operation is larger than a present degree of opening. CONSTITUTION:A degree of opening of indoor expansion valves 8a, 8b is increased in a stepwise manner of 0 to 2000 steps. In the event that an indoor device is stopped in its operation or in a thermo-off state, its step becomes 200 steps. During a heating operation, the indoor device 14a is stopped in its operation or in a thermo-off state, gas of high temperature and high pressure is heat exchanged with indoor air by an indoor side heat exchanger 9b through a four-way valve 3 and then the gas is returned to a compressor 2. At this time, as to a control over an expansion valve 8a of the indoor device 14a, a room temperature is compared with a set temperature and it is judged whether the thermo-off state is set or not. Then in the event that once passed, a degree of opening of 1000 steps is set by the indoor electric expansion valve controller 15a. Subsequent to the second time, the degree of opening of the valve becomes 200 steps. As decribed above, a degree of opening of the expansion valve 8a is opened in 1000 steps for every 10 minutes by one minute, thereby refrigerant is prevented from being accumulated in the indoor device.

公开(公告)号：JPH03294727A

公开(公告)日：1991-12-25

申请号：JP9577190

申请日：1990-04-10

Applicant: MATSUSHITA REFRIGERATION

Inventor： SHIMOMURA NOBUO ,  NODA TOSHINORI ,  KITAYAMA HIROSHI ,  NAKAGAWA NOBUHIRO

IPC: F24F1/00

Abstract: PURPOSE:To quickly raise the room temperature up to the set temperature at start-up and improve the heating efficiency by a method wherein warm air is distributed to an auxiliary air outlet which openes toward a room and an air flow path provided at the end of a double floor by a air blow distribution device,and portion of warm air is recirculated to a heat exchanger through a recirculation port by recirculation air distribution device for re-heat exchanging. CONSTITUTION:An impeller 28 is revolved at the start-up of heating operation, and the warm air heated by a heat exchanger 27 flows downward. Then, a first damper 32 is driven so as to distribute the warm air to a lower air outlet 31 and an air path 33. A second damper 43 is driven to induce a portion of the warm air into a space above the heat exchanger 40, where heat exchanging takes place again. This operation is repeated to raise the warm air up to a high temperature, and the high temperature warm air is blown from a lower air outlet 31, passes through a lower space 36 and is blown out from an air blow port 37 to heat a residential area 24 from below. Simultaneously, the residential area 24 is heated from above by the high temperature air blown from an auxiliary air blown port 34 so that the room temperature approaches the set temperature quickly.

公开(公告)号：JPH03271661A

公开(公告)日：1991-12-03

申请号：JP7048990

申请日：1990-03-20

Applicant: MATSUSHITA REFRIGERATION

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

IPC: F25B13/00

Abstract: PURPOSE:To procure cooling/heating capacity even when piping is very long or an outdoor unit and a room unit are arranged different in the height by a method wherein a flow passage switching means to switch flow passages of refrigerant corresponding to an operation mode of cooling or heating is provided in a subcooling degree increasing means and a bypass circuit in the outdoor unit. CONSTITUTION:A bypass circuit 17 bypasses the upstream side and the downstream side of a subcooling degree increasing means 14, and a flow passage switching means 18 consists of a first solenoid valve 19 and a second solenoid valve 20. During heating operation, an outdoor side expansion valve 16 decreases the refrigerant pressure and liquid refrigerant flows through a liquid pipe 11, and therefore pressure loss and frosting are difficult to occur. As the refrigerant avoids the subcooling degree increasing means 14 by the flow passage switching means 18, any drawdown of pressure of high pressure due to heat discharge can be prevented. During cooling operation, the liquid refrigerant is made by the flow passage switching means 18 to be heat exchanged through the subcooling degree increasing means 14 so that a subcooling degree is increased, and therefore generation of flush gas in the upstream of room side expansion valves 8a to 8d can be prevented. Accordingly, cooling/ heating capacity can be procured, even when piping is very long and an outdoor unit and a room unit are arranged different in the height.

公开(公告)号：JPH03267657A

公开(公告)日：1991-11-28

申请号：JP6885890

申请日：1990-03-19

Applicant: MATSUSHITA REFRIGERATION

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

IPC: F25B1/00 ,  F25B49/02

Abstract: PURPOSE:To prevent troubles due to shortage of refrigerant by a method wherein before operation of a variable capacity compressor, a refrigerant saturation pressure and a detection pressure detected by a pressure detector are compared by a saturation pressure detector. CONSTITUTION:An outdoor unit controlling means 16 receives an operation starting command by communication. A saturation pressure detector 13 calculates on the basis of an outdoor air temperature detected by an outdoor air temperature detector 14 a refrigerant saturation pressure corresponding to the detected outdoor air temperature, and provides a calculation result to the outdoor unit controlling means 16. The means 16 obtains at the same time a pressure inside a freezing cycle from a pressure detector 11. Then the means 16 conducts a pressure comparison and a condition discrimination, and if the detected pressure is lower than an outdoor air saturation pressure by a prescribed value, provides an alarm to interrupt the operation. The means 16, if it does not judge any abnormal state in the condition discrimination, provides signals to the room unit controlling means 15 to start its operation, and further controls and starts a fourway valve 3, an outdoor side electric expansion valve 5, an out door fan 6 and an inverter 12.

公开(公告)号：JPH0331620A

公开(公告)日：1991-02-12

申请号：JP16596789

申请日：1989-06-28

Applicant: MATSUSHITA REFRIGERATION

Inventor： NODA TOSHINORI ,  KITAYAMA HIROSHI ,  SHIMOMURA NOBUO ,  NAKAGAWA NOBUHIRO

IPC: F24F1/00 ,  F24F13/02 ,  F24F13/068

Abstract: PURPOSE:To make the indoor temperature distribution ideal with more warmth around the lower part of the body than the upper part by providing a means for switching the outlet for air for switching between an upper outlet and a lower outlet according to the operation made of heating or cooling, by forming an opening in the floor through a double floor, by which the void in the double floor communicates with the room, and by forming a plurality of opening in the ceiling, which air opened through the ceiling board and by which the ceiling chamber communicates with the room. CONSTITUTION:An indoor machine 19, which permits the ejection of air to be switched according to heating or cooling, is installed in such a manner as to place the upper outlet 28 inside the ceiling chamber 16; the indoor machine 19 is also connected to the void 14 formed in a double floor. In the ceiling board 2 a plurality of ceiling openings 31 are formed as passages by which the ceiling chamber 16 communicates with the room 1; in the double floor 5 a floor opening 15 is formed as a passage by which the void 14 communicates with the room 1. With this constitution in heating, warm air is ejected from the floor opening 15, which s formed at an end of the double floor 5, that is, outside the living space 6, and sucked through the ceiling openings 31 in the ceiling board 2, thus effecting heating of the room 1 by circulating of ward air, whereas, in cooling, cool air is uniformly ejected from the ceiling openings in the ceiling board and allowed to fall at very low speed. Thus an ideal temperature distribution giving more warmth to the lower part of the body than the upper part can be achieved.