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Differential pressure control adaptive throttle expansion valve

A throttling expansion and self-adaptive technology, applied in the field of throttling expansion valve in the field of throttling refrigeration technology, can solve the problems of unstable system operation, larger valve opening, and smaller throttle valve opening under heavy load, etc. To achieve the effect of simple structure and low cost

Inactive Publication Date: 2005-08-17
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, an automatic expansion valve, also known as a constant pressure expansion valve, has been used in the general cooling field (Wu Yezheng et al., Refrigeration Principles and Equipment, Xi'an: Xi'an Jiaotong University Press, 1987, pp.258-259). The principle is to use the pre-set spring pressure to achieve a basically constant evaporation pressure, but this automatic expansion valve presents a negative feedback feature for load changes, that is, the opening of the throttle valve becomes smaller when the load is large, and the refrigerant flow rate is further reduced ; Or the load decreases, but the opening of the valve becomes larger, resulting in unstable operation of the system, which is rarely used now

Method used

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  • Differential pressure control adaptive throttle expansion valve
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  • Differential pressure control adaptive throttle expansion valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Prepare an adaptive throttling expansion valve with differential pressure control, the structural diagram is shown in figure 1 .

[0022] The differential pressure controlled adaptive throttling expansion valve consists of:

[0023] A differential pressure sensing mechanism includes: a housing 11, an elastic element 12, and an elastic bellows 13 with one end closed; The outer side of the closed end of the tube 13 is fixedly connected to the inner top end of the shell 11, and the bottom end of the elastic bellows 13 is fixedly connected to the inner bottom end of the shell 11; a cavity A is formed between the elastic bellows 13 and the shell 11;

[0024] A flux regulating mechanism: including a transmission rod 21 connected to the inner top of the closed end of the elastic bellows 13, a valve needle 22 and a valve body 23; the valve body 23 has a through hole, and the valve needle 22 moves in the through hole of the valve body 23 Inside, its upper end is clos...

Embodiment 2

[0028] Example 2 Prepare an adaptive throttling expansion valve with differential pressure control, the structure diagram is shown in figure 2 .

[0029] The differential pressure controlled adaptive throttling expansion valve consists of:

[0030] A pressure difference sensing mechanism: including a casing 11, a tension spring 12, and an elastic bellows 13 with one end closed; the flux adjustment mechanism includes a transmission rod 21, a valve needle 22 and a valve body 23; its structure is: an elastic bellows with one end closed A chamber A is formed between 13 and the shell 11, a chamber B is formed between the bellows 13 and the valve body 23, and the tension spring 12 is used to balance the force generated by the pressure difference between the chambers A and B; the transmission rod 21 and the bellows The closed end of 13 is connected, and the valve needle 22 is connected to the top of the transmission rod 21; the change of pressure difference causes the bellows 13 to...

Embodiment 3

[0031] Example 3 Prepare an adaptive throttling expansion valve with differential pressure control, the structure diagram is shown in image 3 .

[0032] The self-adaptive throttling expansion valve with differential pressure control in this embodiment includes a differential pressure sensing mechanism and a flux regulating structure;

[0033] The differential pressure sensing mechanism includes a casing 11, a pressure spring 12, and an elastic bellows 13 with one end closed; the flux adjustment mechanism 2 includes a transmission rod 21, a valve needle 22 and a valve body 23; its structure is: an elastic bellows 13 with one end closed It forms a chamber A with the shell 11, the bellows 13 and the valve body 23 form a chamber B, and the pressure spring 12 is used to balance the force generated by the pressure difference between the chambers A and B; the transmission rod 21 is connected to the closed end of the bellows 13 , the valve needle 22 is connected to the transmission ...

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Abstract

This invention relates to pressure difference controlled self-adapting throttle expansion valve, which comprises pressure difference inductance structure and elastic elements in outer shell and elastic wave pattern tube, wherein the elastic element both ends are separately connected to the elastic wave pattern tube sealed end outside and outer shell inner top end and the elastic wave tube bottom is connected to the outer shell bottom end. The elastic wave pattern tube and the outer shell form chamber A. The flow adjusting structure comprises drive bar connected to the elastic wave tube sealed end inner top, valve needle and valve with one hole for the needle move. Its sealed upper end is connected to the drive down end.

Description

technical field [0001] The invention relates to a throttling expansion valve in the technical field of throttling refrigeration, in particular to a pressure difference control adaptive throttling expansion valve. technical background [0002] In recent decades, the throttling refrigeration technology of cryogenic multi-component mixed working medium has achieved great development, and has become one of the main refrigeration technologies in the wide temperature range from liquid nitrogen temperature to traditional cascade refrigeration temperature. At present, mature commercial products have come out. The multi-component mixed working medium refrigerator adopting the heat recovery method can effectively improve the refrigeration efficiency to achieve a lower refrigeration temperature, and can be driven by a single-stage oil-lubricated compressor widely used in the general refrigeration field. The mixed refrigerant throttling refrigerator can realize the lower limit of the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B41/04
Inventor 公茂琼吴剑峰胡勤国齐延峰
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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