Abnormality detecting device of auger-type ice making machine and abnormality detecting method thereof

• US 6,915,647 B2
• Filed: 05/21/2003
• Issued: 07/12/2005
• Est. Priority Date: 05/21/2003
• Status: Expired due to Fees

• Current Assignee: Hoshizaki Denki Kabushiki Kaisha
• Original Assignee: Hoshizaki Denki Kabushiki Kaisha
• Inventors: Nagira, Masanobu, Tsuchikawa, Koji
• Primary Examiner(s): Tapolcai, William E.
• Application Number:
  US10/443,449
• Publication Number:
  US 20040231354A1
• Time in Patent Office: 783 Days
• Field of Search: 621/25, 621/26, 621/29, 621/36, 623/54
• US Class Current: 62/129
• CPC Class Codes: F25C 1/147 by using augers
• CPC Class Codes: F25C 2600/04 Control means
• CPC Class Codes: F25C 2700/08 Power to drive the auger motor of an auger type ice making machine
• CPC Class Codes: F25C 5/142 extrusion of ice crystals

Abstract

An auger-type ice making machine has an abnormality detecting device which detects a freezing of an ice-scraping auger on the basis of a hunting of current flowing through an auger motor 25. Current flowing through the auger motor 25 is taken out by a current-voltage converter 45, and an instantaneous value of the taken-out voltage,waveform every predetermined time is A/D converted by an A/D converter 52 which is provided at a controller board 50. A microcomputer 51 detects a peak value from the A/D converted instantaneous value for determining that abnormal current flows through the auger motor 25, when a hunting of the peak value occurs a predetermined number of times or more that is not less than 2 during a predetermined time, or when the state where the hunting of the peak value occurs a predetermined number of times or more that is not less than 2 during a first predetermined time is detected a predetermined number of times or more that is not less than 2 during a second predetermined time that is longer than the first predetermined time. As for the number of hunting times, a state wherein the peak value once becomes greater than a predetermined value, and then, becomes smaller than the predetermined value is counted as one number of hunting times.

Claims

1. An abnormality detecting device of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormally detecting device comprising:

abnormality determining means for determining an abnormality in the auger-type ice making machine when a hunting occurs a predetermined number of times or more, in the current flowing through the auger motor during a predetermined time said predetermined number of times being not less than 2.

5. An abnormality detecting device according to claim 1, wherein the auger motor is an AC current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

2. An abnormality detecting device of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting device comprising:

hunting detection means for detecting an occurrence of a hunting, when a hunting occurs a predetermined number of times or more that is not less than 2 within the current flowing through the auger motor, and is during a first predetermined time; and

abnormality determining means for determining that an abnormality has occurred in the auger-type ice making machine when the hunting detection means detects that the hunting occurs a predetermined number of times or more that is not less than 2 in the current flowing through the auger motor during a second predetermined time that is longer than the first predetermined time.

6. An abnormality detecting device according to claim 2, wherein the auger motor is an AC motor and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

3. An abnormality detecting device of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting device comprising:

crossing detection means for detecting that the current flowing through the auger motor crosses a reference value in either a direction from bottom to top or a direction from top to bottom; and

abnormality determining means for determining that an abnormality occurs in the auger-type ice making machine when the crossing detection means detects the crossing a predetermined number of times or mores that is not less than 2, during a predetermined time.

7. An abnormality detecting device according to claim 3, wherein the auger motor is an AC motor, and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

4. An abnormality detecting device of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting means device comprising:

crossing detection means for detecting that the current flowing through the auger motor crosses over a reference value in either a direction from bottom to top or a direction from top to bottom;

hunting detection means for detecting an occurrence of a hunting, when the crossing detection means detects the crossing a predetermined number of times or more, that is not less than 2, and is during a first predetermined time; and

abnormality determining means for determining that an abnormality occurs in the auger-type ice making machine when the hunting detection means detects that the hunting occurs a predetermined number of times or more that is not less than 2 in the current flowing through the auger motor during a second predetermined time that is longer than the first predetermined time.

8. An abnormality detecting device according to claim 4, wherein the auger motor is an AC motor, and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

15. An abnormality detecting method according to claim 4, wherein the auger motor is an AC motor and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

9. An abnormality detecting method of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting method comprising:

an abnormality determining step for determining that an abnormality occurs in the auger-type ice making machine when a hunting occurs a predetermined number of times or more, that is not less than 2, in the current flowing through the auger motor during a predetermined time.

13. An abnormality detecting method according to claim 9, wherein the auger motor is an AC motor and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

10. An abnormality detecting method of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting method comprising:

a hunting detection step for detecting as an occurrence of a hunting that a hunting occurs a predetermined number of times or more, that is not less than 2, in the current flowing through the auger motor during a first predetermined time; and

an abnormality determining step for determining that an abnormality occurs in the auger-type ice making machine when the hunting detection step detects that the hunting occurs a predetermined number of times or more that is not less than 2 in the current flowing through the auger motor during a second predetermined time that is longer than the first predetermined time.

14. An abnormality detecting method according to claim 10, wherein the auger motor is an AC motor and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.

11. An abnormality detecting method of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting method comprising:

a crossing detection step for detecting that the current flowing through the auger motor crosses over a reference value in either one of directions from bottom to top and from top to bottom; and

an abnormality determining step for determining that an abnormality occurs in the auger-type ice making machine when the crossing detection step detects the crossing a predetermined number of times or more, that is not less than 2, during a predetermined time.

12. An abnormality detecting method of an auger-type ice making machine provided with a refrigerating cylinder having an evaporating pipe of a refrigerating system at its outer periphery, to the inside of which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the internal surface of the refrigerating cylinder and an auger motor for driving the ice-scraping auger, the abnormality detecting method containing:

a crossing detection step for detecting that the current flowing through the auger motor crosses over a reference value in either one of directions from bottom to top and from top to bottom;

a hunting detection step for detecting as an occurrence of a hunting that the crossing detection step detests the crossing a predetermined number of times or more that is not less than 2 during a first predetermined time; and

an abnormality determining step for determining that an abnormality occurs in the auger-type ice making machine when the hunting detection step detects that the hunting occurs a predetermined number of times or more that is not less than 2 in the current flowing through the auger motor during a second predetermined time that is longer than the first predetermined time.

16. An abnormality detecting method according to claim 12, wherein the auger motor is an AC motor and the current flowing through the auger motor is an amplitude of AC current flowing through the AC motor.