CN104236170A - VRF air conditioning system, oil balancing device of VRF air conditioning system and control method of VRF air conditioning system - Google Patents
VRF air conditioning system, oil balancing device of VRF air conditioning system and control method of VRF air conditioning system Download PDFInfo
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- CN104236170A CN104236170A CN201410521092.8A CN201410521092A CN104236170A CN 104236170 A CN104236170 A CN 104236170A CN 201410521092 A CN201410521092 A CN 201410521092A CN 104236170 A CN104236170 A CN 104236170A
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Abstract
The invention discloses an oil balancing device of a VRF air conditioning system. The oil balancing device of the VRF air conditioning system comprises an oil separator, pipelines connected in parallel, an oil balancing pipeline and a check valve, wherein the oil separator is provided with a mixing input end, a refrigerant output end and a lubricating oil output end, the pipelines connected in parallel include the first oil return pipeline and the second oil return pipeline, the first oil return pipeline and the second oil return pipeline are communicated with the lubricating oil output end and the input ends of compressors, an electronic expansion valve is arranged on the first oil return pipeline, the oil balancing pipeline is communicated with the first oil returning pipeline, and the check valve is arranged on the oil balancing pipeline. According to the oil balancing device of the VRF air conditioning system, due to the fact that the pipelines which are used for communicating the compressors with different outdoor units are arranged, dynamic balance of lubricating oil between the different outdoor units of the VRF air conditioning system and between different compressors of each outdoor unit is achieved, it is guaranteed that sufficient lubricating oil can be supplied to all air conditioning devices when the air conditioning devices operate, and the failure rate of the outdoor units is lowered. The invention further provides a VRF air conditioning system with the oil balancing device and a control method of the VRF air conditioning system.
Description
Technical field
The present invention relates to air conditioner technical field, more particularly, relate to a kind of oil balancing unit of multi-online air-conditioning system, and there is a kind of multi-online air-conditioning system of above-mentioned oil balancing unit, the invention still further relates to a kind of control method of above-mentioned multi-online air-conditioning system.
Background technology
Multi-online air-conditioning system is made up of multiple air conditioning subsystem, can realize the independent assortment of one or more off-premises station and multiple stage or an indoor set.
Because multi-online air-conditioning system has multiple air conditioning subsystem, so its connecting line is comparatively complicated, and internal system has multiple compressor (the plurality of compressor can be the compressor of the multiple parallel connections in an off-premises station, also can be the compressor in multiple off-premises station in parallel).In the process of work, the compressor that load is different, its working order is also different, the high loaded process of some compressor possibilities, and some compressors may not operate, in this case, very easily there is the unbalanced problem of each compressor chamber distribution of lubrication oil, namely the compressor possibility lubricating oil had is not enough, and some compressor possibility lubricating oil is too much, and this very easily causes the damage of compressor.
Therefore, how reducing the damage probability of compressor, is current those skilled in the art's problem demanding prompt solution.
Summary of the invention
In view of this, the invention provides a kind of oil balancing unit of multi-online air-conditioning system, it can realize between the multiple compressors in an off-premises station, or the balance dispensing of the lubricating oil between the off-premises station of multiple parallel connection, make the compressor in same off-premises station or different off-premises station have sufficient lubricating oil, thus reduce the damage probability of off-premises station.
In order to achieve the above object, the invention provides following technical scheme:
An oil balancing unit for multi-online air-conditioning system, it is arranged in off-premises station, comprising:
For separating of the oil eliminator of refrigerant and lubricating oil, described oil eliminator has and is communicated with the output of the compressor of multiple parallel connection, to import the Mixed design end of refrigerant and lubricating oil, the refrigerant output of the refrigerant obtained after being separated with output, and the lubricating oil output of the lubricating oil obtained after exporting separation;
Be arranged in parallel, and be communicated with the first return line and second return line of the input of described lubricating oil output and described compressor, described first return line is provided with electric expansion valve;
Be communicated with described first return line, to derive or to input the oil balance tube road of lubricating oil;
Be arranged on the stop valve on described oil balance tube road.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, described second return line has multiple parallel branch, and is communicated with the input one_to_one corresponding of all described compressors respectively, and each described parallel branch is provided with oil return capillary.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, described first return line is provided with oil balance check valve, described oil balance check valve is positioned at the upstream being communicated with position of described oil balance tube road and described first return line.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, described lubricating oil output is provided with filter, and described filter bits converges the upstream at position in described first return line and described second return line.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, also comprise the coolant solo valve being arranged on described refrigerant output, and be arranged on the mixing check valve of Mixed design end.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, described mixing check valve is multiple, and is separately positioned on the output of each described compressor.
Preferably, in the oil balancing unit of above-mentioned multi-online air-conditioning system, described mixing check valve is one, and what its output being arranged on whole described compressor merged confluxes on pipeline.
Based on above-mentioned oil balancing unit, present invention also offers a kind of multi-online air-conditioning system, comprise one or more off-premises station, in described off-premises station, be provided with the oil balancing unit described in above-mentioned any one.
Present invention also offers a kind of control method of multi-online air-conditioning system, it is applicable to above-mentioned multi-online air-conditioning system, and this control method comprises the following steps:
1) off-premises station powers on for the first time, and described electric expansion valve opens 150 pulse apertures, closes after keeping 1min ~ 3min;
2) open the compressor of described off-premises station, described electric expansion valve opens 150 pulse apertures when 3min ~ 7min opened by described compressor, closes when described compressor operating 13min ~ 17min;
3) after the compressor of an off-premises station all quits work, electric expansion valve described in it opens 150 pulse apertures, closes after keeping 1min ~ 3min;
4) open the stop valve of whole off-premises station, and after 15min ~ 25min opened by the compressor of the main frame of whole off-premises station, described electric expansion valve 150 pulse aperture opened by described main frame, closes after continuing 2min ~ 4min;
5) after the 3s ~ 7s of interval, in multiple off-premises station first opens described electric expansion valve 150 pulse aperture from machine, close after keeping 2min ~ 4min, again after the 3s ~ 7s of interval, second opens described electric expansion valve 150 pulse aperture from machine, keep closing after 2min ~ 4min, until in multiple off-premises station all work all open described electric expansion valve 150 pulse aperture once from machine, and restart timing;
6) repeat a step 4 every 15min ~ 25min later) and step 5) operation, until all off-premises station quits work.
In the oil balancing unit of multi-online air-conditioning system provided by the invention, in multi-online air-conditioning system, oil eliminator, the first return line, the second return line, electric expansion valve, oil balance tube road and stop valve are set up.Wherein, oil eliminator has three in-out ends, be respectively and be communicated with the output of multiple parallel connection compressor, in order to import the Mixed design end of refrigerant and lubricating oil, and respectively by be separated obtain refrigerant, lubricating oil export refrigerant output and lubricating oil output, and the first return line and the second return line are two parallel pipelines be communicated with described lubricating oil output, and electric expansion valve is arranged in the first return line.Further, the first return line is also communicated with oil balance tube road, and to be imported in the first return line by the lubricating oil in the external world, or derived by lubricating oil unnecessary in the first return line, stop valve is arranged on oil balance tube road in order to control the break-make on oil balance tube road.
Oil balancing unit operationally, when the off-premises station in multi-online air-conditioning system is one, because the first return line is all communicated with the input of multiple parallel connection compressor with the second return line, so the first return line and the second return line are not only for the oil return of the compressor in same off-premises station, oily balanced action can also be played between the compressor of multiple parallel connection, namely when the electric expansion valve on the first return line opens 150 pulse aperture, be interconnected by the first return line and the second return line between different compressors, thus realize the dynamic flow of lubricating oil between different compressors, and then make between different compressors, to realize oil balance, and in this process oil balance tube road under the shutoff of stop valve, the leakage of lubricating oil can not be caused.
When the off-premises station in multi-online air-conditioning system be in parallel multiple time, above-mentioned oil balancing unit is provided with in each off-premises station, and whole off-premises stations realizes turned in parallel by oil balance tube road, through the lubricating oil that lubricating oil output exports, a part reenters in compressor by the second return line, after the electric expansion valve be arranged in the first return line opens 150 pulse apertures, lubricating oil in other off-premises stations under pressure, by the stop valve opened, the first return line is entered into through oil balance tube road, and enter into compressor by the first return line, with make-up oil, same, when the electric expansion valve in other off-premises stations opens 150 pulse aperture, lubricating oil superfluous in this off-premises station under pressure, the oil balancing unit of other off-premises stations will be entered into by oil balance tube road, and then make lubricating oil enter into the compressor needing other off-premises stations supplemented.
The oil balancing unit of multi-online air-conditioning system provided by the invention, by arranging the pipeline be communicated with between compressor and different off-premises station, to achieve in multi-online air-conditioning system between different off-premises station and with the dynamic equilibrium of lubricating oil between off-premises station different compressors, make the distribution of lubrication oil in multi-online air-conditioning system between each branch road more even, ensure that each air-conditioning equipment can have sufficient lubricating oil to use in the running, thus reduce the damage probability of off-premises station.Present invention also offers a kind of multi-online air-conditioning system with above-mentioned oil balancing unit, and the control method of this multi-online air-conditioning system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The fundamental diagram of an off-premises station in the multi-online air-conditioning system that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the fundamental diagram of multiple off-premises station in multi-online air-conditioning system;
The flow chart of the control method of the multi-online air-conditioning system that Fig. 3 provides for the embodiment of the present invention.
In above Fig. 1 and Fig. 2:
Oil eliminator 1, compressor 2, electric expansion valve 3, stop valve 4, oil return capillary 5, oil balance check valve 6, filter 7, coolant solo valve 8, mixing check valve 9, cross valve 10, return line 11.
Detailed description of the invention
The invention provides a kind of oil balancing unit of multi-online air-conditioning system, it can realize between the multiple compressors in an off-premises station, or the balance dispensing of the lubricating oil between the off-premises station of multiple parallel connection, make in every compressor or each off-premises station, there is sufficient lubricating oil, thus reduce the damage probability of off-premises station.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As depicted in figs. 1 and 2, in FIG, for the ease of distinguishing, first return line dotted line represents, the double dot dash line of oil balance tube road represents, second return line is represented by dashed line, for two off-premises stations in parallel in Fig. 2, annexation between multiple off-premises station is described, the oil balancing unit of the multi-online air-conditioning system that the embodiment of the present invention provides, be arranged in off-premises station, this multi-online air-conditioning system can have the off-premises station that an off-premises station also can have multiple parallel connection, when off-premises station is multiple, oil balancing unit is provided with in each off-premises station, this oil balancing unit comprises:
For separating of the oil eliminator 1 of refrigerant and lubricating oil, oil eliminator 1 has and is communicated with the output Y of the compressor 2 of multiple parallel connection, to import the Mixed design end A of refrigerant and lubricating oil, the refrigerant obtained after being separated with output, and the refrigerant output B be communicated with the cross valve 10 of off-premises station, and the lubricating oil output C obtained after exporting separation;
Be arranged in parallel, and be communicated with the first return line and second return line of the input W of lubricating oil output C and compressor 2, first return line is provided with electric expansion valve 3, and the first return line is communicated with the return line 11 of compressor 2, through this return line 11, first return line is communicated with (part that also return line 11 be communicated with the output Y of compressor 2 can be regarded as the first return line) with the input W of compressor 2;
Be communicated with the first return line, with equalizing line lubricating oil being exported to other off-premises stations or imported by the lubricating oil in other off-premises stations;
Be arranged on oil balance tube road, control the stop valve 4 of oil balance tube road break-make.
In the oil balancing unit of the multi-online air-conditioning system that the present embodiment provides, in multi-online air-conditioning system, oil eliminator 1, first return line, the second return line, electric expansion valve 3, oil balance tube road and stop valve 4 are set up.Wherein, oil eliminator 1 has three in-out ends, be respectively and be communicated with the output Y of multiple parallel connection compressor 2, in order to import the Mixed design end A of refrigerant and lubricating oil, and respectively by be separated obtain refrigerant, lubricating oil export refrigerant output B and lubricating oil output C, and the first return line and the second return line are two parallel pipelines be communicated with described lubricating oil output C, and electric expansion valve 3 is arranged in the first return line.Further, the first return line is also communicated with oil balance tube road, and to be imported in the first return line by the lubricating oil in the external world, or derived by lubricating oil unnecessary in the first return line, stop valve 4 is arranged on oil balance tube road in order to control the break-make on oil balance tube road.
Oil balancing unit operationally, when the off-premises station in multi-online air-conditioning system is one, because the first return line and the second return line are all communicated with the input W of multiple parallel connection compressor 2, so the first return line and the second return line are not only for the oil return of the compressor 2 in same off-premises station, oily balanced action can also be played between the compressor 2 of multiple parallel connection, namely when the electric expansion valve 3 on the first return line opens 150 pulse aperture, be interconnected by the first return line and the second return line between different compressors 2, thus realize the dynamic flow of different compressors 2 lubricating oil, and then make between different compressors 2, to realize oil balance, and in this process oil balance tube road under the shutoff of stop valve 4, the leakage of lubricating oil can not be caused.
When the off-premises station in multi-online air-conditioning system be in parallel multiple time, above-mentioned oil balancing unit is provided with in each off-premises station, and whole off-premises stations realizes turned in parallel by oil balance tube road, through the lubricating oil that lubricating oil output C exports, a part reenters in compressor 2 by the second return line, after the electric expansion valve 3 be arranged in the first return line opens 150 pulse apertures, lubricating oil in other off-premises stations under pressure, by the stop valve 4 opened, the first return line is entered into through oil balance tube road, and enter into compressor 2 by the first return line, with make-up oil, same, when the electric expansion valve in other off-premises stations opens 150 pulse aperture, lubricating oil superfluous in this off-premises station under pressure, the oil balancing unit of other off-premises stations will be entered into by oil balance tube road, and then make lubricating oil enter into the compressor needing other off-premises stations supplemented.
The oil balancing unit of the multi-online air-conditioning system that the present embodiment provides, by arranging the pipeline be communicated with between compressor and different off-premises station, to achieve in multi-online air-conditioning system between different off-premises station and with the dynamic equilibrium of lubricating oil between off-premises station different compressors, make the distribution of lubrication oil in multi-online air-conditioning system between each branch road more even, ensure that each air-conditioning equipment can have sufficient lubricating oil to use in the running, thus reduce the damage probability of off-premises station.
In order to optimize technique scheme further, in the oil balancing unit of the multi-online air-conditioning system that the present embodiment provides, second return line has multiple parallel branch, and is communicated with the input W one_to_one corresponding of all compressors 2 respectively, and each parallel branch is provided with oil return capillary 5.Second return line in the present embodiment, only plays oil return effect, is again imported in compressor 2 by the input W of compressor 2, thus enter periodic duty next time by the isolated lubricating oil of oil eliminator 1.And in the present embodiment, off-premises station no matter in multi-online air-conditioning system is one or multiple, multiple compressors 2 has been arranged in parallel, so need the second return line to be provided with multiple parallel branch, to be communicated with the input W of the multiple compressors 2 of parallel connection respectively in each off-premises station.Further, each parallel branch all arranges oil return capillary 5, this is the preferred embodiment of the present embodiment, oil return capillary 5 can control the flow regime of lubricating oil in the second return line, thus enables the recirculating oil quantity entering into the lubricating oil of compressor 2 through the second return line more meet the work requirements of compressor 2.
Preferably, the first return line is provided with oil balance check valve 6, oil balance check valve 6 is positioned at the upstream being communicated with position of oil balance tube road and the first return line.This oil balance check valve 6 can control the one-way flow of lubricating oil in the first return line, make unnecessary lubricating oil can rest in the first return line, avoid unnecessary lubricating oil to flow to the second return line or return lubricating oil output C, when needed, it can be made to flow to smoothly in other off-premises stations of needs.When electric expansion valve 3 opens 150 pulse aperture, the oily equilibration capillary 7 that one public is only had between compressors 2 all in same off-premises station, continue to supply lubricating oil between all compressors 2, the lubricating oil between different compressors 2 finally can be made to reach dynamic equilibrium.
Concrete, lubricating oil output C is provided with filter 7, and filter 7 is positioned at the upstream that the first return line and the second return line converge position.As depicted in figs. 1 and 2, the effect of this filter 7 is exactly the lubricating oil that filtering lubricant oil output C exports, and before making lubricating oil again enter into compressor 2, impurity wherein can be removed.
Further, in the oil balancing unit of the multi-online air-conditioning system that the present embodiment provides, also comprise the coolant solo valve 8 being arranged on refrigerant output B, and be arranged on the mixing check valve 9 of Mixed design end A.The setting of these two kinds of check valves, is the backflow in order to avoid refrigerant and mixed liquor (refrigerant and the rear liquid formed of lubricating oil mixing), affects the normal work of oil eliminator 1 and compressor 2.
As depicted in figs. 1 and 2, mixing check valve 9 is multiple, and is separately positioned on the output Y of each compressor 2, and this kind of set-up mode is the preferred embodiment of the present embodiment.Certainly, mixing check valve 9 is except adopting except aforesaid way arranges, and it can also be set to one, and confluxing on pipeline of merging of the output Y being arranged on whole compressor 2.
Based on the oil balancing unit of the multi-online air-conditioning system provided in above-described embodiment, the embodiment of the present invention additionally provides a kind of multi-online air-conditioning system, it comprises one or more off-premises station, and this multi-online air-conditioning system has the oil balancing unit provided in above-described embodiment.
Because this multi-online air-conditioning system have employed the oil balancing unit that above-described embodiment provides, so the beneficial effect that this multi-online air-conditioning system is brought by oil balancing unit please refer to corresponding part in above-described embodiment, do not repeat them here.
As shown in Figure 3, based on above-mentioned multi-online air-conditioning system, the embodiment of the present invention additionally provides a kind of control method of multi-online air-conditioning system, be applicable to that there is 1 ~ 4 off-premises station, and in each off-premises station, be provided with the multi-online air-conditioning system of above-mentioned oil balancing unit, this control method comprises the following steps:
S101, off-premises station power on for the first time, and electric expansion valve opens 150 pulse apertures, and close after keeping 1min ~ 3min, the opening time of preferred electron expansion valve 3 is 2min.
S102, open the compressor of described off-premises station, electric expansion valve opens 150 pulse apertures when 3min ~ 7min opened by compressor, close when compressor operating 13min ~ 17min; Preferred electron expansion valve 3 is opened when 5min opened by compressor 2, and closes after compressor 2 works 15min.
S103, after the compressor of an off-premises station all quits work, its electric expansion valve opens 150 pulse apertures, and close after keeping 1min ~ 3min, the opening time of preferred electron expansion valve 3 is 2min.When the off-premises station of multi-online air-conditioning system is one, after aforesaid operations completes, reclocking, and the operation repeating above-mentioned S101 ~ S103 within each timing period; When the off-premises station of multi-online air-conditioning system be in parallel multiple time, then proceed following operation:
S104, open the stop valve of whole off-premises station, and after 15min ~ 25min opened by the compressor of the main frame (this main frame refers to an off-premises station in whole off-premises stations that can control self and other off-premises station work) of whole off-premises station, described electric expansion valve 150 pulse aperture opened by described main frame, closes after continuing 2min ~ 4min; After 20min opened by the compressor 2 of preferred main frame, its electric expansion valve 3 is made to open 3min.
After S105, interval 3s ~ 7s, in multiple off-premises station first opens electric expansion valve 150 pulse aperture from machine (referring to whole off-premises station by other off-premises stations of host computer control from machine), close after keeping 2min ~ 4min, again after the 3s ~ 7s of interval, second opens electric expansion valve 150 pulse aperture from machine, keep closing after 2min ~ 4min, until in multiple off-premises station all work all open electric expansion valve 150 pulse aperture once from machine, and restart timing; In the present embodiment, every spacer segment time is preferably 5s, and each electric expansion valve 3 opening time from machine is preferably 3min.
S106, the later operation repeating a step S104 and step S105 every 15min ~ 25min, until all off-premises station quits work, the recurrence interval time of preferred steps S104 and step S105 is 20min, have the off-premises station do not opened in this do action, then this off-premises station then remains that its electric expansion valve is not opened.
Be arranged on the electric expansion valve 3 of the oil balancing unit in each off-premises station, its switch is both by the control (control procedure is step S101 ~ S103) of self off-premises station, also be subject to the control of the off-premises station as main frame, need self to control preferentially when action.
When only having an off-premises station in multi-online air-conditioning system, by the control method of the electric expansion valve 3 of oil balancing unit in above step S101 ~ S103, the lubricating oil equilibrium assignment in same off-premises station between different compressors 2 can be realized.
When multi-online air-conditioning system has multiple stage off-premises station, by the control method of the electric expansion valve 3 of oil balancing unit in above step S101 ~ S106, the lubricating oil equilibrium assignment between different off-premises station can be realized.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. an oil balancing unit for multi-online air-conditioning system, is characterized in that, is arranged in off-premises station, comprises:
For separating of the oil eliminator of refrigerant and lubricating oil, described oil eliminator has and is communicated with the output of the compressor of multiple parallel connection, to import the Mixed design end of refrigerant and lubricating oil, the refrigerant output of the refrigerant obtained after being separated with output, and the lubricating oil output of the lubricating oil obtained after exporting separation;
Be arranged in parallel, and be communicated with the first return line and second return line of the input of described lubricating oil output and described compressor, described first return line is provided with electric expansion valve;
Be communicated with described first return line, to derive or to input the oil balance tube road of lubricating oil;
Be arranged on the stop valve on described oil balance tube road.
2. the oil balancing unit of multi-online air-conditioning system according to claim 1, it is characterized in that, described second return line has multiple parallel branch, and is communicated with the input one_to_one corresponding of all described compressors respectively, and each described parallel branch is provided with oil return capillary.
3. the oil balancing unit of multi-online air-conditioning system according to claim 1, it is characterized in that, described first return line is provided with oil balance check valve, described oil balance check valve is positioned at the upstream being communicated with position of described oil balance tube road and described first return line.
4. the oil balancing unit of multi-online air-conditioning system according to claim 1, it is characterized in that, described lubricating oil output is provided with filter, and described filter bits converges the upstream at position in described first return line and described second return line.
5. according to the oil balancing unit of multi-online air-conditioning system described in any one on claim 1-4, it is characterized in that, also comprise the coolant solo valve being arranged on described refrigerant output, and be arranged on the mixing check valve of Mixed design end.
6. the oil balancing unit of multi-online air-conditioning system according to claim 5, it is characterized in that, described mixing check valve is multiple, and is separately positioned on the output of each described compressor.
7. the oil balancing unit of multi-online air-conditioning system according to claim 5, it is characterized in that, described mixing check valve is one, and what its output being arranged on whole described compressor merged confluxes on pipeline.
8. a multi-online air-conditioning system, comprises one or more off-premises station, it is characterized in that, is provided with the oil balancing unit in the claims 1-7 described in any one in described off-premises station.
9. a control method for multi-online air-conditioning system, is characterized in that, is applicable to multi-online air-conditioning system according to claim 8, and this control method comprises the following steps:
1) off-premises station powers on for the first time, and described electric expansion valve opens 150 pulse apertures, closes after keeping 1min ~ 3min;
2) open the compressor of described off-premises station, described electric expansion valve opens 150 pulse apertures when 3min ~ 7min opened by described compressor, closes when described compressor operating 13min ~ 17min;
3) after the compressor of an off-premises station all quits work, electric expansion valve described in it opens 150 pulse apertures, closes after keeping 1min ~ 3min;
4) open the stop valve of whole off-premises station, and after 15min ~ 25min opened by the compressor of the main frame of whole off-premises station, described electric expansion valve 150 pulse aperture opened by described main frame, closes after continuing 2min ~ 4min;
5) after the 3s ~ 7s of interval, in multiple off-premises station first opens described electric expansion valve 150 pulse aperture from machine, close after keeping 2min ~ 4min, again after the 3s ~ 7s of interval, second opens described electric expansion valve 150 pulse aperture from machine, keep closing after 2min ~ 4min, until in multiple off-premises station all work all open described electric expansion valve 150 pulse aperture once from machine, and restart timing;
6) repeat a step 4 every 15min ~ 25min later) and step 5) operation, until all off-premises station quits work.
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| CN201410521092.8A CN104236170A (en) | 2014-09-30 | 2014-09-30 | VRF air conditioning system, oil balancing device of VRF air conditioning system and control method of VRF air conditioning system |
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