Capillary tube thermostatic expansion valve mixing and filling device based on PLC (programmable logic controller)

Abstract

The invention discloses a capillary tube thermostatic expansion valve mixing and filling device based on a PLC (programmable logic controller). The front end fixture table surface of a vertical operating table is provided with a thermostatic expansion valve filling fixture; a panel on the upper part of the fixture table surface is provided with a refrigerant reducing valve, a helium reducing valve, two throttling valves, two glass rotor flow meters, a qualification indicating lamp, a disqualification indicating lamp, a refrigerant pressure meter, a helium pressure meter, a touch screen display, a fluorescent lamp and a power supply switch; a panel at the lower part of the fixture table surface is an operating key region, and is provided with a scram starting button and a front door; the upper part of the vertical operating table is provided with gas circuit pipe fittings, such as a pressure sensor, an electromagnetic valve and the like, and the bottom of the vertical operating table is provided with an electric wiring board; and a PLC control system is adopted as an electric control device, and is respectively connected with the touch screen display, the pressure sensor, the scram starting switch, the qualification indicating lamp, the disqualification indicating lamp and the electromagnetic valve. The device provided by the invention has the advantages of being convenient to install, high in filling accuracy of two types of media and high in automatic degree, and being used for the difficulties of mixing and filling accuracy of the existing thermostatic expansion valve.

Description

technical field [0001] The invention relates to a thermal expansion valve charging device, in particular to a PLC-based capillary thermal expansion valve mixing charging device. Background technique [0002] As an important part of the refrigeration device, the thermal expansion valve is one of the four basic equipment of the refrigeration system. The thermal expansion valve realizes the throttling from the condensing pressure to the evaporating pressure, and controls the flow of the refrigerant. Its working quality directly determines the working quality of the entire refrigeration system. The flow regulation of the refrigerant depends on the vaporization saturation pressure of the filling medium in the temperature sensing bag, so the control of the filling medium is the key process for the qualification of the thermal expansion valve. At present, the filling methods mostly used are manual filling and single gas filling. The filling equipment has low degree of automation, ...

AI Technical Summary

Problems solved by technology

At present, the most used filling methods are manual filling and single gas filling. The filling equipment has low degree of automation, difficult installation of filling parts, and time-consuming adjustment of fixtures, etc., resulting in inaccurate and poor consistency of filling results.

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