Compressor with flooded start control

Patent metadata

Field	Value
Publication number	US-10066617-B2
Application number	US-201514947121-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Apr 12, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A system and method for flooded start control of a compressor are provided. An ambient temperature sensor generates ambient temperature data and a compressor temperature sensor generates compressor temperature data. A control module receives the ambient temperature data and the compressor temperature data, determines whether the outdoor ambient temperature is rising faster than the compressor temperature, determines whether the outdoor ambient temperature is greater than the compressor temperature by more than a predetermined threshold for more than a predetermined time period, and, in response to the outdoor ambient temperature rising faster than the compressor temperature and the outdoor ambient temperature being greater than the compressor temperature by more than the predetermined threshold for more than the predetermined time period, operates the compressor according to at least one cycle including a first time period during which the compressor is on and a second time period during which the compressor is off.

First claim

What is claimed is:

1. A system comprising:
a compressor for a refrigeration system;
an ambient temperature sensor that generates ambient temperature data corresponding to an outdoor ambient temperature;
a compressor temperature sensor that generates compressor temperature data corresponding to a compressor temperature;
a control module that receives the ambient temperature data and the compressor temperature data, determines whether the outdoor ambient temperature is rising faster than the compressor temperature, determines whether the outdoor ambient temperature is greater than the compressor temperature by more than a predetermined threshold for more than a predetermined time period, and, in response to the outdoor ambient temperature rising faster than the compressor temperature and the outdoor ambient temperature being greater than the compressor temperature by more than the predetermined threshold for more than the predetermined time period, operates the compressor according to at least one cycle including a first time period during which the compressor is on and a second time period during which the compressor is off.

2. The system of claim 1 wherein liquid remains in the compressor throughout the at least one cycle.

3. The system of claim 2 wherein the liquid includes both lubricant and refrigerant.

4. The system of claim 1 , wherein the first time period is two seconds and the second time period is five seconds.

5. The system of claim 1 , wherein the at least one cycle includes a first cycle and a second cycle and wherein the first time period of the first cycle is less than the first time period of the second cycle.

6. The system of claim 1 , wherein the control module operates the compressor normally after the at least one cycle.

7. A method comprising:
generating ambient temperature data with an ambient temperature sensor, the ambient temperature data corresponding to an outdoor ambient temperature;
generating compressor temperature data with a compressor temperature sensor, the compressor temperature data corresponding to a compressor temperature of a compressor of a refrigeration system;
receiving, with a control module, the ambient temperature data and the compressor temperature data;
determining, with the control module, whether the outdoor ambient temperature is rising faster than the compressor temperature;
determining, with the control module, whether the outdoor ambient temperature is greater than the compressor temperature by more than a predetermined threshold for more than a predetermined time period; and
operating, with the control module, the compressor according to at least one cycle including a first time period during which the compressor is on and a second time period during which the compressor is off, in response to the outdoor ambient temperature rising faster than the compressor temperature and the outdoor ambient temperature being greater than the compressor temperature by more than the predetermined threshold for more than the predetermined time period.

8. The method of claim 7 wherein liquid remains in the compressor throughout the at least one cycle.

9. The method of claim 8 wherein the liquid includes both lubricant and refrigerant.

10. The method of claim 7 , wherein the first time period is two seconds and the second time period is five seconds.

11. The method of claim 7 , wherein the at least one cycle includes a first cycle and a second cycle and wherein the first time period of the first cycle is less than the first time period of the second cycle.

12. The method of claim 7 , further comprising operating, with the control module, the compressor normally after the at least one cycle.

Assignees

• Emerson Climate Technologies

Inventors

• Pham Hung M

Classifications

• F04C2240/81

  Sensor, e.g. electronic sensor for control or monitoring · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F25B43/00

  Arrangements for separating or purifying gases or liquids (in analysers or rectifiers F25B33/00); Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat (F25B40/00 takes precedence) · CPC title

• F25B2500/26

  characterised by the startup of the refrigeration cycle · CPC title

• F25B2700/21152

  at the discharge side of the compressor · CPC title