CN1952537A - Refrigerant circulation control device and method for multi-connected air conditioner - Google Patents
Refrigerant circulation control device and method for multi-connected air conditioner Download PDFInfo
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- CN1952537A CN1952537A CN 200510109088 CN200510109088A CN1952537A CN 1952537 A CN1952537 A CN 1952537A CN 200510109088 CN200510109088 CN 200510109088 CN 200510109088 A CN200510109088 A CN 200510109088A CN 1952537 A CN1952537 A CN 1952537A
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Abstract
The invention relates to a control device of cool medium recycling quality for multi-connected air conditioner and the control method. The device comprises adjusting device for cool medium quality, electromagnetic valve, electronic expansion valve, suction temperature sensor and pressure sensor of low pressure. The adjusting device is connected to the position between condensator and electronic expansion device by main pipe and in the cavity branching pipe is set on. On the branching pipe electromagnetic valve is set in series. One branching pipe is connected with the drainage pipe of compressor and the other is connected with suction pipe. The suction pipe of compressor is connected with the pressure sensor of low pressure and suction temperature sensor. When the system runs normally, the electronic expansion valve is adjusted to control the quality of cool medium. When the opening degree of electronic expansion valve is over the range, the electromagnetic valve is adjusted to control the quality of cool medium again. In this way residual cool medium in the device is recycled to the system so as to take part in running newly and the cycling quality of cool medium is controlled in time under any condition.
Description
Technical field
The present invention relates to a kind of air-conditioning, especially for the refrigerant circulation control device and the control method of combined air conditioners.
Background technology
The combined air conditioners unit is a kind of air-conditioning unit by many outdoor unit parallel connections and many indoor units parallel connections.Especially when heating operation, because the liquid refrigerants overwhelming majority is all in indoor machine evaporation, the difference of the unlatching platform number of indoor set, the required refrigerant circulation of unit operation is also inequality.The platform number that indoor set is opened more for a long time, the coolant quantity that circulation needs is just more, the platform number that indoor set is opened more after a little while, the coolant quantity that circulation needs is just less.And, will assemble more liquid coolant in the indoor set that does not move for a long time, cause the whole system operation to occur lacking the fluorine phenomenon through regular meeting, influenced the runnability of unit, reduce the service life of unit, and can cause user's result of use very poor.And when indoor set is opened the quantity minimizing, cold-producing medium can present excessive situation in very short time, if the untimely minimizing of excessive refrigerant will cause the refrigerant evaporation after the throttling insufficient, cause liquid refrigerants to get back to compressor easily, cause the compressor liquid hammer and damage.At above situation, combined air conditioners should have a kind of device that the refrigerant amount of systemic circulation is regulated, any situation with assurance system operation all has rational coolant quantity to carry out cycle operation, improves the operational efficiency of unit, guarantees user's result of use and unit service life.
Present multi-joint machine system, the not enough or too much situation of refrigerant circulation during the ubiquity operation generally all is that processing mode is: store too much refrigerant by using high pressure reservoir and gas-liquid separator; Regulate the flow of cold-producing medium by regulating parts such as heating power expansion valve, electric expansion valve, to keep in the circulation rational coolant quantity being arranged; Refrigerant recovering in the interior machine that will not open by the running of regular refrigerant recovering participates in circulation again to the circulatory system. these measures to a certain extent what can the alleviation system the too much and not enough problem of refrigerant during operation, still still have the following disadvantages a little:
The first, store too much refrigerant in the circulation by high pressure fluid reservoir, gas-liquid separator, these two kinds of devices all belong to passive built-in method and store too much refrigerant.Can't move needs according to system, when lacking refrigerant circulation in system, the refrigerant in time will installing is transferred to and is participated in circulation in the system, can not guarantee that unit all the time in the optimum state operation, does not have regulating action.
The second, by the internal circulating load in the opening control system of regulating heating power expansion valve, electric expansion valve, as documents CN2685779 and CN1563861, though it can regulate refrigerant circulation, can only in the aperture scope of heating power expansion valve, electric expansion valve, work.If exceeded the aperture adjustable range of heating power expansion valve, electric expansion valve, refrigerant circulation is still improper, and these two kinds of devices had just lost efficacy.
Three, the running of regular refrigerant recovering is when having the interior machine of not running in whole system, regularly the refrigerant that accumulates in the machine in these is recovered to and participates in running in the systemic circulation again, but the problem that refrigerant lacks in the refrigerant recovering running resolution system circulation regularly, the situation too much to refrigerant in the system has no benefit, and the system that also can't guarantee all keeps suitable refrigerant circulation at each moment in service.
Summary of the invention
Main purpose of the present invention is to provide a kind of refrigerant circulation control device and control method of combined air conditioners, it is exactly can't satisfy system requirements, the method that needs a kind of like this control device that can regulate and control with this device in order to solve the above-mentioned refrigerant circular flow of working as.
To achieve these goals, technical solution of the present invention is: a kind of refrigerant circulation control device that is used for combined air conditioners, the off-premises station of this combined air conditioners comprises compressor, condenser and evaporimeter, compressor exhaust pipe is connected with evaporimeter with condenser respectively by cross valve with air intake duct, and wherein said refrigerant circulation control device comprises:
One adjusting device for amount of coolant, it is connected with evaporimeter with condenser by gathering pipe;
One electric expansion valve, between its connection and adjusting device for amount of coolant and the evaporimeter,
Pipeline, this pipeline is connected respectively to the blast pipe and the air intake duct of compressor from the chamber of adjusting device for amount of coolant, and is in series with magnetic valve on the pipeline;
An one suction temperature sensor and a low-pressure sensor are connected on the compressor suction duct.
The described refrigerant circulation control device that is used for combined air conditioners, wherein the pipeline of installing on the chamber of this adjusting device for amount of coolant is the T type, its two arm is divided into the two ends of T type tube head.
The described refrigerant circulation control device that is used for combined air conditioners wherein is equipped with two fold-type pipes on the chamber of this adjusting device for amount of coolant.
The described refrigerant circulation control device that is used for combined air conditioners inserts on the chamber that gathers the Guan Kecong adjusting device for amount of coolant that wherein adjusting device for amount of coolant is connected with system or inserts from the chamber side, and its insertion is about 20mm apart from cavity bottom.
The described refrigerant circulation control device that is used for combined air conditioners, wherein the chamber of this adjusting device for amount of coolant can be cylinder, spheroid, tetragonal body or cone.
The described refrigerant circulation control device that is used for combined air conditioners, wherein the capacity of this refrigerant circulation control device is greater than 80% of whole unit perfusion coolant quantity.
A kind of refrigerant circulation control method that is used for combined air conditioners, it is made as desired value SH with the suction superheat value of stipulating in the compressor specifications earlier
0Each actual super heat value SH that is constantly surveyed that then this desired value and system is in operation compares, when system normally moves, control cold medium flux by regulating electronic expansion valve opening, when exceeding the scope that electronic expansion valve opening controls, control cold medium flux by opens solenoid valve again.
The described refrigerant circulation control method that is used for combined air conditioners, wherein suction superheat SH is defined as: (Ps-temp wherein for SH TS-, TS represents the suction temperature of the suction temperature sensor test of compressor, and Ps-temp represents the pairing saturation temperature value of low pressure of this system low-voltage pressure sensor test this moment.
The described refrigerant circulation control method that is used for combined air conditioners, its above-mentioned adjustment process is specific as follows:
(1) when system normally moves, compares SH and SH earlier
0Size, as SH＞SH
0The time, coolant quantity is less than normal in the illustrative system, and electronic expansion valve opening is increased to increase cold medium flux, and all close magnetic valve this moment, up to SH SH
0As SH＜SH
0The time, coolant quantity is bigger than normal in the illustrative system, electronic expansion valve opening is reduced in like manner magnetic valve all to cut out to reduce cold medium flux, up to SH SH
0
When (2) system moves, as SH＞SH
0The time, and the upper limit that electronic expansion valve opening is reached its adjustable range still can not the increase system in required coolant quantity, at this moment open the magnetic valve that is connected on the blast pipe, close the magnetic valve that is connected on the air intake duct, the liquid refrigerants that stores in the adjusting device for amount of coolant is transferred to is participated in circulation in the system, with the refrigerant circulation in the increase system, until SH SH
0,, at this moment enter the electric expansion valve normal operating conditions again closed electromagnetic valve; And as SH＜SH
0The time, and the lower limit that electronic expansion valve opening is reached its adjustable range still can not reduce coolant quantity required in the system, at this moment open the magnetic valve that is connected on the air intake duct, close the magnetic valve that is connected on the blast pipe, to store in the refrigerant suction adjusting device for amount of coolant too much in the circulation, with the refrigerant circulation in the minimizing system, until SH SH
0,, at this moment enter electric expansion valve normal regulating state again closed electromagnetic valve.
After adopting said apparatus and method, it has the following effect that showing:
This invention is applied to multi-joint machine system with refrigerant recovering control, can remedy deficiency separately, accumulates refrigerant recovering to circulation in the indoor set that refrigerant recovering control regularly will not move; Adjusting device for amount of coolant is in the gap and refrigerant recovering process of twice regular cold recovery, refrigerant circulation in can real-time regulation system, thereby realize accurately controlling the purpose of refrigerant circulation in the whole system running, compressor is moved in optimum state all the time, fully guaranteed unit operation performance and user's result of use, and the life-span of having improved unit operation to a certain extent.
Below cooperate appended graphic explanation in detail by specific embodiment so that the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 is the multi-gang air conditioner sketch that comprises the refrigerant circulation control device;
Fig. 2 is the structure chart one of adjusting device for amount of coolant;
Fig. 3 is the structure chart two of adjusting device for amount of coolant;
Fig. 4 is the structure chart three of adjusting device for amount of coolant;
Fig. 5 is the structure chart four of adjusting device for amount of coolant;
[primary clustering symbol description]
11 ' blast pipe, 12 ' air intake duct
1 adjusting device for amount of coolant, 11 chambers
2 magnetic valves, 3 magnetic valves
4 electric expansion valves, 5 suction temperature sensors
6 low-pressure sensors 7 gather pipe
8 condensers, 9 evaporimeters
10 pipelines, 101 arms
102 arms
The specific embodiment
As shown in Figure 1, the off-premises station of combined air conditioners comprises compressor, condenser 8 and evaporimeter 9, and compressor exhaust pipe 11 ' is connected with evaporimeter 9 with condenser 8 respectively by cross valve with air intake duct 12 ', and wherein said refrigerant circulation control device comprises:
One adjusting device for amount of coolant 1, it is connected with evaporimeter 9 with condenser 8 by gathering pipe 7;
One electric expansion valve 4, between its connection and adjusting device for amount of coolant 1 and the evaporimeter 9,
An one suction temperature sensor 5 and a low-pressure sensor 6 are connected on the compressor suction duct 12 '.
As Fig. 2, shown in Figure 3, the pipeline of installing on the chamber 11 of this adjusting device for amount of coolant 1 10 can be the T type, and its two arm 101,102 is divided into the two ends of T connector portion.
As Fig. 4, shown in Figure 5, the pipeline of installing on the chamber 11 of this adjusting device for amount of coolant 1 10 can be two fold-type pipes.
The gathering pipe and 7 can insert above the chamber 11 of this adjusting device for amount of coolant 1 connected system from it, as Fig. 2, shown in Figure 5, or insert from chamber 11 sides, as shown in Figure 3, Figure 4, and its insert chamber 11 apart from the bottom be about 20mm for best, what pass in and out that this device gathers pipe when guaranteeing normal operation conditions all is liquid refrigerant.The bye-pass that connects magnetic valve will just insert inside cavity and communicate with it and get final product, because insert too deeply, when the excessive refrigerant that stores in device is too much, pipeline 10 mouths of pipe may submerge below the liquid level, cause the compressor liquid hammer to damage if open the magnetic valve 3 that communicates with low pressure owing to existing bigger pressure reduction that refrigerant liquid directly is pressed into low-pressure side in the device this moment in the compressor.
The chamber 11 of this adjusting device for amount of coolant 1 can be cylinder, spheroid, tetragonal body or cone.
The overall design capacity of this refrigerant circulation control device is that if the outdoor compressor of N platform is arranged, so the design capacity of the refrigerant circulation control device of every outdoor compressor is the 1/N of overall design capacity greater than 80% of whole unit perfusion coolant quantity.
Above-mentioned its control method of refrigerant circulation control device that is used for combined air conditioners is: the suction superheat value that compressor is stipulated by specifications is made as desired value SH earlier
0, then with this desired value SH
0Compare with each the actual super heat value SH that is constantly surveyed that is in operation of system, when system normally moves, control cold medium flux by the aperture of regulating electric expansion valve 4, when scope that the aperture that surpasses electric expansion valve 4 is controlled, control what of refrigerant circulation by opens solenoid valve 2 or 3 again, wherein suction superheat SH is defined as: SH Ts-(Ps-temp), wherein, Ts represents the suction temperature of suction temperature sensor 5 tests of compressor, and Ps-temp represents the pairing saturation temperature value of low pressure of these system low-voltage pressure sensor 6 tests this moment.
Its above-mentioned adjustment process is specific as follows:
(1) when system normally moves, compares SH and SH earlier
0Size, as SH＞SH
0The time, coolant quantity is less than normal in the illustrative system, and electric expansion valve 4 apertures are increased to increase cold medium flux, and all close magnetic valve 2,3 this moment, up to SH SH
0As SH＜SH
0The time, coolant quantity is bigger than normal in the illustrative system, and electric expansion valve 4 apertures are reduced in like manner magnetic valve 2,3 all to cut out, up to SH SH to reduce cold medium flux
0
When (2) system moves, as SH＞SH
0The time, and the upper limit that electric expansion valve 4 apertures are reached its adjustable range still can not the increase system in required coolant quantity, at this moment open the magnetic valve 2 that is connected on the blast pipe, close the magnetic valve 3 that is connected on the air intake duct, the liquid refrigerants that stores in the adjusting device for amount of coolant 1 is transferred to is participated in circulation in the system, with the refrigerant circulation in the increase system, until SH SH
0, again magnetic valve 2 cuts out, at this moment enter electric expansion valve 4 normal operating conditions; And as SH＜SH
0The time, and the lower limit that electric expansion valve 4 apertures is reached its adjustable range still can not reduce coolant quantity required in the system, at this moment open the magnetic valve 3 that is connected on the air intake duct, close the magnetic valve 2 that is connected on the blast pipe, to store in the refrigerant suction adjusting device for amount of coolant 1 too much in the circulation, with the refrigerant circulation in the minimizing system, until SH SH
0, again magnetic valve 3 cuts out, at this moment enter electric expansion valve 4 normal regulating states.
System's refrigerant circulation adjustment process during now by heating operation is analyzed the operation principle of the control device that is used for the combined air conditioners refrigerant circulation, as shown in Figure 1:
1, reach maximum when electric expansion valve 4, SH is still greater than SH
0The time, opens solenoid valve 2 is closed magnetic valve 3, the liquid refrigerants that stores in the adjusting device for amount of coolant 1 is transferred to is participated in circulation in the system, and the refrigerant circulation with in the increase system equals SH until SH
0
Its principle analysis: during heating operation, when magnetic valve 2 is opened, when magnetic valve 3 cuts out, the high-temperature high-pressure air flow that comes out from the exhaust side of compressor is divided into two strands, one enters adjusting device for amount of coolant 1 after cooling off by indoor evaporator, volume flow is made as q1 this moment refrigerant and enters state in the adjusting device for amount of coolant 1 for liquid, it is above refrigerant liquid in adjusting device for amount of coolant 1, one directly enters adjusting device for amount of coolant 1 by magnetic valve 2, volume flow is made as q2, and the refrigerant state that enter in the adjusting device for amount of coolant 1 this moment is a gaseous state.Consult pressure-enthalpy chart, can know the high temperature and high pressure gas process condensation front and back of discharging from compressor, pressure is similar to no change.The liquid refrigerants volume flow that adjusting device for amount of coolant 1 flows out when supposing to heat is q3.Q3 q1 q2 then, so q3＞q1, the liquid refrigerants that promptly flows in the adjusting device for amount of coolant is less than the liquid refrigerants that flows out in the adjusting device for amount of coolant 1, liquid refrigerants in the liquid refrigerants quantity regulating device 1 will reduce gradually, make to participate in circulation in the refrigerant inflow system that accumulates in this device again, thereby reach the purpose of refrigerant in the increase system.
2, reach minimum when electric expansion valve 4 apertures, SH is still less than SH
0The time, opens solenoid valve 3 is closed magnetic valve 2, refrigerant too much in the circulation is sucked in the adjusting device for amount of coolant 1 store, and the refrigerant circulation with in the minimizing system equals SH until SH
0
Principle analysis: during heating operation, when magnetic valve 3 leaves, when magnetic valve 2 closes, because of magnetic valve 3 links to each other with suction side in the system, after magnetic valve 3 is opened, it is identical with low-pressure side to be equivalent to adjusting device for amount of coolant 1, make that pressure reduces rapidly in this device, and the liquid refrigerants that flows out will be back to rapidly in the lower adjusting device for amount of coolant of pressure 1 from this device, realize the purpose that system's refrigerant circulation reduces.
Said system cyclic process route is seen shown in Figure 1ly, and the refrigerant circular flow when heating is to being: compressor outlet → cross valve → indoor evaporator → electric expansion valve → adjusting device for amount of coolant → condenser → compressor suction duct;
The refrigerant circular flow is to being during refrigeration: compressor outlet → cross valve → condenser → adjusting device for amount of coolant → electric expansion valve → gather pipe → indoor evaporator → gather pipe → compressor suction duct;
Heat, the refrigerant circulation control method Principles of Regulation when freezing are identical.
Above-described embodiment only is explanation technological thought of the present invention and characteristics, its purpose makes the personage who has the knack of this technology can understand content of the present invention and is implementing according to this, when can not with qualification claim of the present invention, promptly the equalization of doing according to disclosed thought generally changes or modifies, and must be encompassed in the claim of the present invention.
Claims (9)
1, a kind of refrigerant circulation control device that is used for combined air conditioners, the off-premises station of this combined air conditioners comprises compressor, condenser and evaporimeter, compressor exhaust pipe is connected with evaporimeter with condenser respectively by cross valve with air intake duct, it is characterized in that: described refrigerant circulation control device comprises:
One adjusting device for amount of coolant, it is connected with evaporimeter with condenser by gathering pipe,
One electric expansion valve, between its connection and adjusting device for amount of coolant and the evaporimeter,
Pipeline, this pipeline is connected respectively to the blast pipe and the air intake duct of compressor from the chamber of adjusting device for amount of coolant, and is in series with magnetic valve on the pipeline;
An one suction temperature sensor and a low-pressure sensor are connected on the compressor suction duct.
2, the refrigerant circulation control device that is used for combined air conditioners as claimed in claim 1, it is characterized in that: the pipeline of installing on the chamber of this adjusting device for amount of coolant is the T type, and its two arm is divided into the two ends of T type tube head.
3, the refrigerant circulation control device that is used for combined air conditioners as claimed in claim 1 is characterized in that: two fold-type pipes are installed on the chamber of this adjusting device for amount of coolant.
4, the refrigerant circulation control device that is used for combined air conditioners as claimed in claim 1, it is characterized in that: insert on the chamber that gathers the Guan Kecong adjusting device for amount of coolant that adjusting device for amount of coolant is connected with system or insert, and its insertion is about 20mm apart from cavity bottom from the chamber side.
5, the refrigerant circulation control device that is used for combined air conditioners as claimed in claim 1, it is characterized in that: the chamber of this adjusting device for amount of coolant can be cylinder, spheroid, tetragonal body or cone etc.
6, the refrigerant circulation control device that is used for combined air conditioners as claimed in claim 4 is characterized in that: the capacity of this refrigerant circulation control device is for pouring into 80% of coolant quantity greater than whole unit.
7, a kind of refrigerant circulation control method that is used for combined air conditioners, it is characterized in that: earlier the suction superheat value of stipulating in the compressor specifications is made as desired value SH0, each actual super heat value SH that is constantly surveyed that then this desired value and system is in operation compares, when system normally moves, control cold medium flux by regulating electronic expansion valve opening, when exceeding the scope that electronic expansion valve opening controls, control cold medium flux by opens solenoid valve again.
8, the refrigerant circulation control method that is used for combined air conditioners as claimed in claim 7, it is characterized in that: suction superheat SH is defined as: (Ps-temp wherein for SH TS-, TS represents the suction temperature of the suction temperature sensor test of compressor, and Ps-temp represents the pairing saturation temperature value of low pressure of this system low-voltage pressure sensor test this moment.
9, the refrigerant circulation control method that is used for combined air conditioners as claimed in claim 7, it is characterized in that: above-mentioned adjustment process is specific as follows:
(1) when system normally moves, the first relatively size of SH and SH0, when SH＞SH0, coolant quantity is less than normal in the illustrative system, and electronic expansion valve opening is increased to increase cold medium flux, at this moment magnetic valve all cuts out, up to SH SH0.When SH＜SH0, coolant quantity is bigger than normal in the illustrative system, electronic expansion valve opening is reduced in like manner magnetic valve all to cut out to reduce cold medium flux, up to SH SH0;
When (2) system moves, when SH＞SH0, and the upper limit that electronic expansion valve opening is reached its adjustable range still can not the increase system in required coolant quantity, at this moment open the magnetic valve that is connected on the blast pipe, close the magnetic valve that is connected on the air intake duct, the liquid refrigerants that stores in the adjusting device for amount of coolant is transferred to is participated in circulation in the system, with the refrigerant circulation in the increase system, until SH SH0,, at this moment enter the electric expansion valve normal operating conditions again closed electromagnetic valve; And when SH＜SH0, and the lower limit that electronic expansion valve opening is reached its adjustable range still can not reduce coolant quantity required in the system, at this moment open the magnetic valve that is connected on the air intake duct, close the magnetic valve that is connected on the blast pipe, with storing in the refrigerant suction adjusting device for amount of coolant too much in the circulation, with the refrigerant circulation in the minimizing system, until SH SH0, closed electromagnetic valve, at this moment enter electric expansion valve normal regulating state again.
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| CN 200510109088 CN1952537A (en) | 2005-10-17 | 2005-10-17 | Refrigerant circulation control device and method for multi-connected air conditioner |
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| CN 200510109088 CN1952537A (en) | 2005-10-17 | 2005-10-17 | Refrigerant circulation control device and method for multi-connected air conditioner |
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2005
- 2005-10-17 CN CN 200510109088 patent/CN1952537A/en active Pending
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