Unlock instant, AI-driven research and patent intelligence for your innovation.

Two-stage expansion refrigerating device

A refrigeration device and two-stage expansion technology, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of the decline in refrigeration effect, the increase in the cost of refrigeration devices, and the inability to use the secondary expansion refrigeration device, etc., to achieve cost reduction, The effect of accurate control

Inactive Publication Date: 2008-02-06
SANYO ELECTRIC CO LTD
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the gas-phase refrigerant that does not exert the refrigeration effect flows into the evaporator through early evaporation, the refrigeration effect is reduced, and the characteristics of the two-stage expansion refrigeration device cannot be exerted.
Therefore, it is necessary to measure the pressure of the refrigerant passing through the high-pressure side expansion mechanism and control it so that the pressure becomes an optimum pressure. However, if a pressure sensor is installed to measure the pressure, the cost of the refrigeration system will increase significantly. bad situation

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
  • Two-stage expansion refrigerating device
  • Two-stage expansion refrigerating device
  • Two-stage expansion refrigerating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Fig. 1 shows a refrigerant circuit diagram of a two-stage expansion refrigeration device according to an embodiment of the present invention. The two-stage expansion refrigeration device consists of compressor 1, radiator 2, high-pressure side expansion valve (high-pressure side expansion mechanism) 3, gas-liquid separator 4, low-pressure side expansion valve (low-pressure side expansion mechanism) 5 and evaporator 6 to form a refrigerant circuit. The compressor 1 has a low-stage compression element 1A and a high-stage compression element 1B, and the two compression elements 1A and 1B are integrated by a single motor (not shown). In addition, the low-pressure refrigerant is compressed to an intermediate pressure in the low-stage compression element 1A, discharged to an intermediate-pressure portion between the low-stage compression element 1A and the high-stage compression element 1B, and then compressed on the high-stage side. Element 1B is compressed to high pressure...

Embodiment 2

[0077] In addition, in the first embodiment above, the controller 50 estimates the pressure P2 of the refrigerant passing through the high-pressure side expansion valve 3 based on the temperature of the refrigerant passing through the high-pressure side expansion valve 3 measured by the temperature sensor 52. The estimated pressure P2 controls the high-pressure side expansion valve 3 so that the pressure of the refrigerant passing through the high-pressure side expansion valve 3 reaches the optimum pressure, but the present invention is not limited thereto, at least as long as the control mechanism (in the embodiment, the controller 50 ) Estimate the pressure P2 of the refrigerant passing through the high-pressure side expansion mechanism (high-pressure side expansion valve 3) based on the temperature measured by the temperature measuring mechanism (temperature sensor 52 in the embodiment), and control the high-pressure side expansion based on the estimated pressure P2 Either o...

Embodiment 3

[0089] In addition, in the above-mentioned embodiments, the pressure P2 of the refrigerant passing through the high-pressure side expansion valve 3 is estimated based only on the temperature measured by the temperature sensor 52, and based on the estimated pressure P2, the high-pressure side expansion valve 3 or the low-pressure side expansion valve 3 are controlled. valve 5, but in addition to the refrigerant pressure passing through the high-pressure side expansion valve 3, the high-pressure side expansion valve 3 or the low-pressure side expansion valve 5 may also be controlled based on the pressure P1 of the intermediate pressure part of the compressor 1 . An example of such a case will be described in detail below. Furthermore, in this embodiment, the same refrigerant circuit as that in the first embodiment shown in FIG. 1 is used for the refrigerant circuit.

[0090] In the present embodiment, the controller 50 controls the high-pressure side expansion valve 3 based on t...

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

An object is to provide a two-stage expansion refrigerating device capable of performing control with low cost so that a pressure of a refrigerant which has flowed through a high-pressure-side expansion unit is an optimum pressure, the device comprises a control unit (a controller) which controls a compressor (a low-stage-side compression element and a high-stage-side compression element) and each expansion unit (a high-pressure-side expansion valve as a high-pressure-side expansion unit and a low-pressure-side expansion valve as a low-pressure-side expansion unit), and a temperature sensor (a temperature detection unit) which detects a temperature of the refrigerant which has flowed through the high-pressure-side expansion valve, and the controller estimates a pressure of the refrigerant which has flowed through the high-pressure-side expansion valve based on a temperature detected by the temperature sensor, and controls one of the high-pressure-side expansion valve and the low-pressure-side expansion valve based on the estimated pressure.

Description

technical field [0001] The invention relates to a two-stage expansion refrigeration device, the expansion mechanism is composed of a high-pressure side expansion mechanism and a low-pressure side expansion mechanism, and the refrigerant decompressed in the high-pressure side expansion mechanism is further decompressed in the low-pressure side expansion mechanism . Background technique [0002] In the existing two-stage expansion refrigeration device, the refrigerant is composed of a compressor composed of a low-stage compression element and a high-stage compression element, a radiator, a high-pressure side expansion mechanism, a gas-liquid separation mechanism, a low-pressure side expansion mechanism, and an evaporator. circuit. Then, the gas refrigerant discharged from the high-stage side compression element of the compressor flows into the radiator, where it dissipates heat. The refrigerant condensed in the radiator is depressurized to an intermediate pressure in the hig...

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
Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/00
CPCF25B2700/21174F25B2600/0253F25B2600/2509F25B2700/2106F25B2700/2109F25B2700/21175F25B2700/21F25B2700/2102F25B2400/23F25B2400/13Y02B30/741F25B2600/2513F25B1/10F25B2341/0662Y02B30/70F25B41/39
Inventor 崎道哲对比地亮佑今井悟斋博之
Owner SANYO ELECTRIC CO LTD