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Refrigerant compressor driven by variable supply frequency motor

A compressor and refrigerant technology, applied in the field of refrigeration compressors, can solve the problems of intermittent operation at a single speed, spending a lot of time and cost, etc.

Inactive Publication Date: 2007-01-17
ITAL WANBAO ACC SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another major disadvantage of using a compressor driven by a variable speed electric motor is that it requires the refrigeration plant to utilize a special thermostatic temperature control system, both in terms of hardware and software, which is different from that currently used in conventional refrigeration plants. Unlike conventional refrigeration systems, the motor of the compressor works intermittently at a single speed
As a result, refrigeration equipment manufacturers have to spend a lot of time and money to redesign and test every equipment prototype included in their manufacturing process

Method used

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  • Refrigerant compressor driven by variable supply frequency motor
  • Refrigerant compressor driven by variable supply frequency motor
  • Refrigerant compressor driven by variable supply frequency motor

Examples

Experimental program
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example 2

[0035] Example 2 - Normal Food Storage and Preservation Practices

[0036] By means of the wire 9, the controller 7 can find that the utilization rate of the motor 10 is low, that is, the utilization rate of the motor 10 fails to exceed the predetermined number of consecutive trip cycles (for example, 5 cycles) of the thermal switch 12. Threshold value (the predetermined threshold value may be about 50%). At this time, the controller 7 makes the transfer switch 17 transfer in such a way that when the thermal switch 12 is closed, the interface contact 13 can supply power to the first connection contact 19 through the conductive lead 20, thereby enabling the frequency f 1 Next, power is supplied to the compressor driving motor 10, so that the compressor driving motor 10 is rotated at just 1600 rpm. Thus, from this moment onwards (and as long as conditions do not change, as in the example below), the energy consumption of the refrigeration plant caused by the compressor driving...

example 4

[0039] Example 4 - Extended opening of hatch

[0040] From the above mentioned signals 28 and 29 to the wiring contacts 25 and 26 of the controller, the controller can determine whether the door of the refrigeration unit has been opened for a long period of time, for example due to user inattention. time. This enables the compressor drive motor 10 to continue operating for an extended period of time, particularly a period of time exceeding the predetermined 90 minute duration threshold. When the thermostat 12 is in its closed position, it ensures that the changeover switch 17 remains closed to the second connection contact 19 of the controller 7 .

[0041] It will of course be appreciated that when a compressor according to the invention is used with other types of refrigeration equipment, such as refrigerators or freezer-freezers, by introducing appropriate changes in the operating logic of the microprocessor-based controller 7 , the compressor according to the invention pr...

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Abstract

Refrigerant compressor driven by an electric motor (10) whose supply frequency is selectively variable between a discrete number of values (f1, f2, fT) as a function of an input signal. The invention calls for the use of control means (7) which are integrated in the compressor and are adapted to monitor two or more quantities that are variable with time in a mutually independent manner, of which at least one is representative of the actual operating conditions of the appliance, said control means being further adapted to generate said input signal with a value that corresponds to a pre-established combination of the monitored quantities.

Description

technical field [0001] The present invention relates to refrigerant compressors for refrigeration appliances for domestic or similar applications, ie of the type driven by electric motors with variable supply frequency. Background technique [0002] The importance of restrictions, i.e. reducing the energy consumption of household appliances, by public authorities has led to a number of official directives, such as those issued by the European Commission, with the aim of reducing the so-called greenhouse effect in general and, inter alia, prohibiting the sale of A device that uses too much energy to do what it is supposed to do. This applies particularly to compression-type refrigerating equipment that is widely spread in countries all over the world. [0003] In order to ensure compliance with these official directives, it is known that various proposals have been made in connection with the use in a general manner of refrigerant compressors driven by electric motors which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02H02P27/02H02P27/04F04B49/02F04B49/06F04B49/20F25B1/00F25D11/00
CPCF04B49/20F04B49/065F25B49/025F04B2203/0209
Inventor 提兹安诺·波托蒂法布里兹欧·卡里罗伯托·伯鲁佐
Owner ITAL WANBAO ACC SRL