# US 10,371,421 B2 · Heat pump-type heating device

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- Number: US 10,371,421 B2
- Document ID: US10371421B2
- Status: Granted
- Kind: B2
- Application number: 15/768,368
- Filed: 2016-10-17
- Published: 2018-11-01
- Granted: 2019-08-06
- Earliest claimed: 2015-10-16
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Teruo Nishida; Shinji Yoshikawa; Yukio Matsusaka
- Web page: https://patentgrep.com/patent/US10371421B2

## CPC

- F25B 30/02: of the compression type
- F24F 11/89: Arrangement or mounting of control or safety devices
- F24H 4/02: Water heaters
- F25B 1/00: Compression machines, plants or systems with non-reversible cycle (F25B3/00, F25B5/00, F25B6/00, F25B7/00, F25B9/00 take precedence)
- F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02)
- F25B 49/025: {Motor control arrangements}
- F25B 2600/112: of evaporator fans
- F25B 2700/2103: near a heat exchanger
- F25B 2700/2106: of fresh outdoor air
- Y02B 30/12: Hot water central heating systems using heat pumps
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The oil level in a compressor is lowered upon activation of the compressor. A heat pump-type heating device of the present invention includes: a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, a motor-operated valve, and a target-side heat exchanger are provided; and an outdoor fan which is provided for the heat-source-side heat exchanger. The target-side heat exchanger is capable of heating, by a refrigerant, fluid supplied from outside. The rotation number of the outdoor fan upon activation of the compressor when a difference between a temperature of the fluid supplied to the target-side heat exchanger and an outside temperature is equal to or larger than a predetermined temperature difference is smaller than the rotation number when the difference is smaller than the predetermined temperature difference.

## Claims

### Claim 1

A heat pump-type heating device comprising:
a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, a motor-operated valve, and a target-side heat exchanger are provided;
an outdoor fan which is provided for the heat-source-side heat exchanger; and
a controller programmed to control the outdoor fan on the basis of signals obtained by temperature sensors respectively configured to measure a temperature of fluid supplied to the target-side heat exchanger from outside the device and an outside temperature,
wherein the target-side heat exchanger is capable of heating, by a refrigerant, the fluid supplied from outside the device, and
wherein the controller is programmed to carry out a rotation number reduction control on the outdoor fan when a difference between the temperature of the fluid supplied to the target-side heat exchanger and the outside temperature is equal to or larger than a predetermined temperature difference, a rotation number of the outdoor fan upon activation of the compressor being smaller than when the difference is smaller than the predetermined temperature difference under the rotation number reduction control.

### Claim 2 (depends on 1)

The heat pump-type heating device according to claim 1, wherein the controller further obtains a signal from a temperature sensor configured to detect a discharge temperature of the compressor, and the controller is programmed to carry out the rotation number reduction control of reducing the rotation number of the outdoor fan upon activation of the compressor when the discharge temperature of the compressor is equal to or lower than a predetermined temperature.

### Claim 3 (depends on 1)

The heat pump-type heating device according to claim 1, wherein the controller further obtains signals from temperature sensors respectively configured to detect a discharge temperature of the compressor and a condensation temperature of the target-side heat exchanger, and the controller is programmed to terminate the rotation number reduction control of reducing the rotation number of the outdoor fan upon activation of the compressor when the discharge temperature of the compressor is higher than the condensation temperature of the target-side heat exchanger.

### Claim 4 (depends on 1)

The heat pump-type heating device according to claim 1, wherein the controller further obtains a signal from a temperature sensor configured to detect a temperature of the heat-source-side heat exchanger, and the controller is programmed to terminate the rotation number reduction control of reducing the rotation number of the outdoor fan upon activation of the compressor when the temperature of the heat-source-side heat exchanger is lower than the outside temperature.