Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cooling device

A technology for a refrigeration device and a control device, which is applied to household refrigeration devices, refrigerators, refrigeration components, etc., can solve the problems of compressor stop, damage, and decay of items, and achieve the effect of reducing discharge pressure.

Active Publication Date: 2009-06-10
코벨코컴프레서가부시키가이샤
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the refrigeration device of Japanese Patent No. 3950304, since the influence of these conditions on the discharge pressure of the compressor is not considered, there is a possibility that the compressor will suddenly stop due to the operation of the high-pressure cut-off device
[0005] When the compressor of the refrigeration unit stops suddenly, the items in the freezer will melt and the items in the freezer will rot, which may cause great damage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cooling device
  • Cooling device
  • Cooling device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Embodiments of the present invention will be described below with reference to the drawings.

[0029] figure 1 A refrigeration device 1 according to a first embodiment of the present invention is shown. The refrigerating device 1 has a circulation flow path 6 provided through a screw compressor 2, a condenser 3, an expansion valve 4, and an evaporator 5. The refrigerant enclosed in the circulation flow path 6 condenses the heat absorbed in the evaporator 5. In the device 3, it is discharged into the cooling water.

[0030] The screw compressor 2 is driven by a motor 7 . Electric power whose frequency is controlled by the inverter 8 is supplied to the motor 7 via a circuit breaker 9 . The output frequency of the inverter 8 is set based on a signal input from the control device 10 . In the circulation flow path 6, there is provided a suction pressure transmitter (suction pressure detection mechanism) 11 that detects the suction pressure of the screw compressor 2 and c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a refrigeration device having a screw compressor driven by a motor controlled with rotation speed and compressing refrigerant, the rotation speed of the motor is reduced in condition that lower limit pressure is not reached by sucked in pressure. The rotation speed of the motor is held in condition that the sucked in pressure is higher than the lower limit pressure and less than an upper limit pressure and a discharge pressure is less than preset value, and if the discharge pressure is higher than the preset value, the rotation speed is reduced. In condition that the sucked in pressure is higher than the upper limit pressure, the rotation speed of the motor is increased if the discharge pressure is less than the preset value and the screw compressor is in overload, and the rotation speed of the motor is reduced if the discharge pressure is not less than the preset value or the screw compressor is in overload. Thereby over load of the motor and excessive rise of the discharge pressure may be prevented, and the screw compressor may be driven respectively to refrigerating the heat load.

Description

technical field [0001] The invention relates to a refrigeration device using a screw compressor. Background technique [0002] Japanese Patent No. 3950304 describes a refrigeration device that controls the rotational speed of a motor that drives a screw compressor in response to a cooling heat load without overloading the motor. In the refrigerating apparatus of this patent document, even if the suction pressure increases, if the load state of the motor is an overloaded state, control is performed so that the rotational speed of the motor is reduced. [0003] In refrigeration equipment, since there is a danger of device rupture when the discharge pressure of the compressor rises abnormally, it is obliged by law to install a high-pressure cut-off device in the refrigeration equipment. When the discharge pressure of the compressor reaches a certain pressure, the high-pressure The cut-off device forcibly cuts off the power supply to the motor. [0004] The discharge pressure ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F25B1/04F25B49/02
CPCF25B1/047F25B49/025F25B2500/06F25B2600/0253F25D29/00
Inventor 壶井升铃木胜之田中启介神吉英次大仓正词
Owner 코벨코컴프레서가부시키가이샤
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com