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JP-7857165-B2 - air conditioner

JP7857165B2JP 7857165 B2JP7857165 B2JP 7857165B2JP-7857165-B2

Inventors

  • 上野 円

Assignees

  • シャープ株式会社

Dates

Publication Date
20260512
Application Date
20220610

Claims (9)

  1. An air conditioner comprising a cycle including an evaporator, a compressor, a condenser, a four-way valve, and an expansion valve, An evaporation temperature detection unit for detecting the evaporation temperature of the evaporating refrigerant, A condensation temperature detection unit that detects the condensation temperature of the condensing refrigerant, A compression ratio calculation unit that calculates the compression ratio from the aforementioned evaporation temperature and condensation temperature, A setting unit that sets the minimum rotational speed of the compressor based on the compression ratio, A control unit that controls the compressor to change its target rotational speed to the minimum rotational speed , A rotational speed calculation unit calculates the rotational speed of the compressor based on the set temperature set in the air conditioner and the room temperature. A comparison unit that compares the calculated rotational speed with the minimum rotational speed. Furthermore , The control unit, An air conditioner that operates the compressor at the minimum rotational speed when the minimum rotational speed is greater than the calculated rotational speed .
  2. The evaporation temperature detection unit detects the evaporation temperature at the bottom of the compressor, The air conditioner according to claim 1, wherein the condensation temperature detection unit detects the condensation temperature at the bottom of the compressor.
  3. An air conditioner comprising a cycle including an evaporator, a compressor, a condenser, a four-way valve, and an expansion valve, An evaporation temperature detection unit for detecting the evaporation temperature of the evaporating refrigerant, A condensation temperature detection unit that detects the condensation temperature of the condensing refrigerant, A compression ratio calculation unit that calculates the compression ratio from the aforementioned evaporation temperature and condensation temperature, A setting unit that sets the minimum rotational speed of the compressor based on the compression ratio, A control unit that controls the compressor to change its target rotational speed to the minimum rotational speed, A rotation speed detection unit for detecting the rotation speed of the compressor, A comparison unit that compares the detected rotation speed with the minimum rotation speed, Furthermore, The control unit, An air conditioner that operates the compressor at the minimum rotational speed when the minimum rotational speed is greater than the detected rotational speed.
  4. An air conditioner comprising a cycle including an evaporator, a compressor, a condenser, a four-way valve, and an expansion valve, An evaporation temperature detection unit for detecting the evaporation temperature of the evaporating refrigerant, A condensation temperature detection unit that detects the condensation temperature of the condensing refrigerant, A compression ratio calculation unit that calculates the compression ratio from the aforementioned evaporation temperature and condensation temperature, A setting unit that sets the minimum rotational speed of the compressor based on the compression ratio, A control unit that controls the compressor to change its target rotational speed to the minimum rotational speed. Furthermore, The control unit controls the compressor to change the target rotational speed to the minimum rotational speed from the time the compressor transitions to a stopped state until it enters an started state and the start-up period has elapsed, in an air conditioner.
  5. The air conditioner according to claim 4 , wherein the control unit further controls the steady-state rotation speed of the compressor to change it to the minimum rotation speed after the rise-up period has elapsed and until the steady-state period has elapsed.
  6. The air conditioner according to claim 4 , wherein the control unit operates the compressor at a final rotational speed lower than the minimum rotational speed until the compressor transitions to a stopped state after the start-up period has elapsed.
  7. The air conditioner according to claim 5 , wherein the control unit operates the compressor at a final rotational speed lower than the minimum rotational speed until the compressor transitions to a stopped state after the steady period has elapsed.
  8. The air conditioner according to claim 4 , wherein the control unit sets the rate at which it changes the target rotation speed to the minimum rotation speed to a slower rate at which it changes outside of the rise-up period.
  9. The air conditioner according to claim 5 , wherein the control unit makes the change speed at which the steady-state rotation speed is changed to the minimum rotation speed slower than the normal change speed outside of the steady-state period.

Description

This invention relates to an air conditioner. The air conditioner described in Patent Document 1 controls the compressor according to the temperature difference between the set temperature and the room temperature. Japanese Patent Publication No. 2014-190600 This block diagram shows an example of the configuration of an air conditioner according to the embodiment.This figure shows an example of a refrigeration cycle configuration.This diagram shows the relationship between the compression ratio and the compressor rotation speed.This diagram shows the ideal relationship between the minimum rotational speed and the compressor rotational speed.This diagram shows the relationship between the actual minimum rotational speed and the compressor rotational speed.This is a flowchart showing the control of an air conditioner according to an embodiment. Embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description will not be repeated. First, with reference to Figure 1, the configuration of the air conditioner 10 according to this embodiment will be described. Figure 1 is a block diagram showing an example of the configuration of the air conditioner 10. As shown in Figure 1, the air conditioner 10 comprises an indoor unit 100, a remote control 105, and an outdoor unit 200. The indoor unit 100 comprises an indoor control unit 110, a remote control transmitting/receiving unit 120, an indoor fan motor 130, a communication unit 140, and an indoor environment detection unit 150. The remote control 105 displays the operating mode of the air conditioner 10 and accepts operating commands. The remote control transmission/reception unit 120 is responsible for the transmission and reception of signals between the remote control 105 and the indoor operation control unit 111, which will be described later. The indoor control unit 110 comprises an indoor operation control unit 111 and an indoor command transmission unit 112. The indoor command transmission unit 112 transmits control commands to the indoor fan motor 130. The communication unit 140 is responsible for sending and receiving signals between the indoor operation control unit 111 and the communication network. The indoor environment detection unit 150 includes a room temperature sensor 151 and an indoor heat exchanger temperature sensor 152. The room temperature sensor 151 is located on the indoor unit 100. The indoor heat exchanger temperature sensor 152 is positioned near the indoor heat exchanger 160. The outdoor unit 200 comprises an outdoor control unit 210, an outdoor fan motor 220, a compressor 230, an expansion valve 240, a four-way valve 250, a suction solenoid valve 260, and an outdoor environment detection unit 270. Of these, the indoor fan motor 130 of the indoor unit 100, and the outdoor fan motor 220, compressor 230, expansion valve 240, four-way valve 250, and suction solenoid valve 260 of the outdoor unit 200 constitute part of the refrigeration cycle 320 that circulates refrigerant between the indoor unit 100 and the outdoor unit 200. The outdoor control unit 210 includes an outdoor operation control unit 211, an outdoor command transmission unit 212, a compression ratio calculation unit 213, a setting unit 214, a control unit 215, a rotational speed calculation unit 216, a comparison unit 217, and a rotational speed detection unit 218. The outdoor command transmission unit 212 transmits control commands to the outdoor fan motor 220, compressor 230, expansion valve 240, four-way valve 250, and suction solenoid valve 260. The indoor control unit 110 and the outdoor control unit 210 cooperate to operate as a single control unit 310. The control unit 310 includes a processor, such as a CPU (Central Processing Unit), and a memory unit. The memory unit of the control unit 310 includes a storage device, such as semiconductor memory, and stores data and computer programs. The processor of the control unit 310 controls each component of the air conditioner 10, including the refrigeration cycle 320, by executing the computer programs stored in the memory unit. The outdoor environment detection unit 270 includes an outdoor temperature sensor 271, an outdoor heat exchanger temperature sensor 272, an evaporation temperature detection unit 273, a suction temperature sensor 274, and a condensation temperature detection unit 275. Next, the overall configuration of the refrigeration cycle 320 will be described with reference to Figures 1 and 2. Figure 2 shows an example of the configuration of the refrigeration cycle 320. As shown in Figure 2, the refrigeration cycle 320 further comprises an indoor heat exchanger 160, an outdoor heat exchanger 280, a two-way valve 291, and a three-way valve 292. Arrow D1 indicates the direction of refrigerant flow in the cooling cycle. The refrigerant flow path, along arrow D1, sequentially passes from