CN2558916Y

CN2558916Y - Central air conditioner set refrigerant flow controlling device

Info

Publication number: CN2558916Y
Application number: CN 02268480
Authority: CN
Inventors: 孟庆山; 林绍风
Original assignee: Lande Air Conditioner Industry Dev Co ltd Weihai
Current assignee: Lande Air Conditioner Industry Dev Co ltd Weihai
Priority date: 2002-07-26
Filing date: 2002-07-26
Publication date: 2003-07-02
Anticipated expiration: 2012-07-26

Abstract

The utility model discloses a refrigerant flux control device of a central air conditioning unit, in particular to a flooded refrigerant flux control device of the central air conditioning unit which applies an electronic expansion valve, comprising a flooded evaporator, an air suction opening, a liquid-supply pipeline of refrigerant, an inspiratory pressure sensor, an inspiratory temperature sensor and a liquid-level sensor of the evaporator. The unit is characterized in that one end of the an inspiratory pressure sensor, the inspiratory temperature sensor and the liquid-level sensor of the evaporator is respectively connected with a electronic expansion valve controller, a driver and the electronic expansion valve in sequence; an output end of the electronic expansion valve is connected with one end of the liquid-supply pipeline. The utility model completely combines the electronic expansion valve with the cooling air conditioner and displays advantages of rapid response speed and high control precision of the electronic expansion valve so as to remarkably improve energy-efficiency ratio and heat exchanging efficiency and further stabilize unit operation, thus the utility model is the most ideal control device.

Description

Central air-conditioning unit refrigerant flow control device

Technical field

The central air-conditioning unit refrigerant flow control device that the utility model relates to belongs to control appliance, is the full-liquid type central air-conditioning unit refrigerant flow control device of applying electronic formula expansion valve specifically.

Background technology

The throttling of traditional electricity refrigeration central air-conditioning unit refrigerant feed liquid part and the control of the degree of superheat often realize that by the control of heating power expansion valve etc. this mode belongs to mechanical.But along with increasing central air-conditioning machine set system now requires higher Energy Efficiency Ratio, more precise dose control, broader opereating specification, some traditional throttling control modes such as heating power expansion valve are powerless with regard to some, and its existing adjustable range is narrow, and control accuracy is low, response speed is slow, poor reliability, leaking appears in fault rate height easily and the degradation problem just seems more and more outstanding under the unit efficiency because the degree of superheat causes greatly.The alternative heating power expansion valve of applying electronic formula expansion valve is realized the throttling of cold-producing medium and is crossed thermal control and do not see.

Summary of the invention

The purpose of this utility model is intended to overcome the deficiency of prior art, and the refrigerant flow that provides a kind of applying electronic formula expansion valve to regulate the central air-conditioning unit is realized the control device to the liquid level and the compressor air suction degree of superheat of air-conditioning unit flooded evaporator.

In order to achieve the above object, the utility model is to realize like this, it has flooded evaporator 9, air entry 1, refrigerant feed liquid pipeline 8, inspiratory pressure sensor 2, suction temperature sensor 3, evaporimeter liquid level sensor 4, be characterized in, one end of inspiratory pressure sensor 2, suction temperature sensor 3, evaporimeter liquid level sensor 4 is connected with electronic expansion valve controller 5, driver 6, electronic expansion valve 7 in regular turn, and electronic expansion valve 7 outputs and refrigerant feed liquid pipeline 8 one ends join.

The utility model fully combines electronic expansion valve with the refrigeration air-conditioner unit, given play to the advantage that response speed is fast, control accuracy is high of electronic expansion valve, utilize its good seal performance simultaneously, the characteristics of highly versatile, be widely used on the central air-conditioning product, obtained significant technology and economic benefit.The Energy Efficiency Ratio, heat exchange efficiency etc. of product are obviously improved, make unit operation more stable, the utility model is the optimal control device of present central air-conditioning unit refrigerant flow.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a driver electrical equipment principle schematic;

Fig. 3 is an electronic expansion valve controller control principle schematic diagram.

The specific embodiment

Flooded evaporator 9 belongs to prior art, inspiratory pressure sensor 2, suction temperature sensor 3, evaporimeter liquid level sensor 4 belongs to prior art, connect by Fig. 1, air entry 1 is the gas outlet after the cold-producing medium in the compressor flooded evaporator 10 evaporates, refrigerant feed liquid pipeline 8 is inlet ports of flooded evaporator 9 inner refrigerants, inspiratory pressure sensor 2, suction temperature sensor 3, one end of evaporimeter liquid level sensor 4 connects electronic expansion valve controller 5 in regular turn, driver 6, electronic expansion valve 7, electronic expansion valve 7 outputs and refrigerant feed liquid pipeline 8 one ends join, the input of electronic expansion valve 7 is connected with supporting condenser, refrigerant feed liquid pipeline 8 other ends are connected with the inlet port of flooded evaporator 9 inner refrigerants

Wherein electronic expansion valve controller 5 (as shown in Figure 3) is by integrated circuit U1 (AT90S4433), U2 (RS232), U3 (TD62003PA), crystal oscillator XTAL1, capacitor C 1-C10, resistance R 1-R9, and button SB1, toggle switch S1, splicing ear J1 form;

Driver 6 is made up of 8 triode S1-S8; W1 in the driver 6, W ' 1, W2, W ' 2 are the stepper motor winding in the electronic expansion valve, and 1., 2., 3., 4. in the driver is the tie point of the stepper motor winding in the electronic expansion valve.

Wherein 26 pin of the integrated circuit U1 in inspiratory pressure sensor 2 outputs and the electronic expansion valve controller 5 are connected; 27 pin of integrated circuit U1 in suction temperature sensor 3 outputs and the electronic expansion valve controller 5 are connected; One end of the resistance R 9 in evaporimeter liquid level sensor 4 outputs and the electronic expansion valve controller 5 is connected; Corresponding one by one the joining of base stage OSI-OS8 of triode S1-SS in the 1-8 pin of integrated circuit U3 in the electronic expansion valve controller 5 and the driver 6; 1. triode S1 emitter stage in the driver 6 and colelctor electrode and the tie point of triode S6 join; 3. the emitter stage of triode S5 in the driver 6 and colelctor electrode and the tie point of triode S2 join; 2. the emitter stage of triode S3 in the driver 6 and colelctor electrode and the tie point of triode S8 join; 4. the emitter stage of triode S7 in the driver 6 and colelctor electrode and the tie point of triode S4 join.Other connects by accompanying drawing, connects with the mains, and gets final product work.

Its control principle: if the inspiratory capacity of cold-producing medium and liquid supply rate keep dynamic balance in the course of work of unit, then the position of the refrigerant liquid in the flooded evaporator 9 can remain on certain height, if the consistent unit with design height of this height just has stable suction superheat and keeps normal operating condition, otherwise device will be out of control, various fault occurs.This device is exactly according to the measurement value of feedback of the inspiratory pressure sensor 2, suction temperature sensor 3 and the evaporimeter liquid level sensor 4 that are connected with the flooded evaporator 9 computational analysis output control pulse through electronic expansion valve controller 5, regulate what of refrigerant feed liquid amount through the open degree of driver 6 control electronic expansion valves 7, so that the position of the refrigerant liquid in the flooded evaporator 9 remains on certain altitude, make unit normally operation under design conditions.If departing from appears in unit running process in the position of the refrigerant liquid in the flooded evaporator 9, liquid level reduces, evaporimeter liquid level sensor 4 will pass to electronic expansion valve controller 5 with the signal that liquid level reduces, after calculating by analysis, can send by electronic expansion valve controller 5 signal that the electronic expansion valve open degree increases, open degree through driver 6 control electronic expansion valves 7 increases, the amount of the cold-producing medium by refrigerant feed liquid pipeline 8 will increase, and the position of the refrigerant liquid in the flooded evaporator 9 will raise and reach desired value.If instead liquid level is higher, evaporimeter liquid level sensor 4 will pass to electronic expansion valve controller 5 with the signal that liquid level raises, electronic expansion valve controller 5 can send the signal that the electronic expansion valve open degree reduces after calculating by analysis, open degree through driver 6 control electric expansion valves 7 reduces, the amount of the cold-producing medium by feed flow pipeline 8 will reduce, the position of liquid will descend, and reaches desired value.

In unit running process, the suction superheat of compressor also can be along with variation during the change in location of the refrigerant liquid in the flooded evaporator 9, in order to improve the reliability of device, also can sample the at any time value of feedback of inspiratory pressure sensor 2 and suction temperature sensor 3 of electronic expansion valve controller 5 calculates the analysis that suction superheat participates in the control of electronic expansion valve 7 open degree.

Claims

1, a kind of central air-conditioning unit refrigerant flow control device, it has flooded evaporator (9), air entry (1), refrigerant feed liquid pipeline (8), inspiratory pressure sensor (2), suction temperature sensor (3), evaporimeter liquid level sensor (4), it is characterized in that, one end of inspiratory pressure sensor (2), suction temperature sensor (3), evaporimeter liquid level sensor (4) is connected with electronic expansion valve controller (5), driver (6), electronic expansion valve (7) in regular turn, and electronic expansion valve (7) output and refrigerant feed liquid pipeline (8) one ends join.

2,, it is characterized in that 26 pin of the integrated circuit U1 in inspiratory pressure sensor (2) output and the electronic expansion valve controller (5) are connected by the described central air-conditioning unit of claim 1 refrigerant flow control device; 27 pin of integrated circuit U1 in suction temperature sensor (3) output and the electronic expansion valve controller (5) are connected; One end of the resistance R 9 in evaporimeter liquid level sensor (4) output and the electronic expansion valve controller (5) is connected; Corresponding one by one the joining of base stage OS1-OS8 of triode S1-S8 in the 1-8 pin of integrated circuit U3 in the electronic expansion valve controller (5) and the driver (6); 1. triode S1 emitter stage in the driver (6) and colelctor electrode and the tie point of triode S6 join; 3. the emitter stage of triode S5 in the driver (6) and colelctor electrode and the tie point of triode S2 join; 2. the emitter stage of triode S3 in the driver (6) and colelctor electrode and the tie point of triode S8 join; 4. the emitter stage of triode S7 in the driver (6) and colelctor electrode and the tie point of triode S4 join.