CN211400406U - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
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- CN211400406U CN211400406U CN201922362885.0U CN201922362885U CN211400406U CN 211400406 U CN211400406 U CN 211400406U CN 201922362885 U CN201922362885 U CN 201922362885U CN 211400406 U CN211400406 U CN 211400406U
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Abstract
The utility model provides an air conditioning system, air conditioning system includes a plurality of oil separators, a plurality of compressor and a plurality of switch, the switching on or breaking off of a plurality of switches is realized a plurality of oil separators switch between parallel connection and series connection, wherein, a plurality of oil separator's parallel connection includes: the air inlets of the oil separators are respectively communicated with the corresponding compressor exhaust ports, and the air outlets of the oil separators are communicated with the refrigerant main circulation pipeline; the series connection of the plurality of oil separators includes: the oil separators are communicated through pipelines which are connected end to end in sequence in the flowing direction of the refrigerant. The utility model discloses can improve oil separating efficiency, avoid air conditioning system to return oil frequently at the operation in-process.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to an air conditioning system.
Background
The oil separator is positioned behind the exhaust port of the compressor and used for separating refrigerant and refrigeration oil, the separated refrigeration oil is gathered at the bottom of the oil separator and is communicated to the air return port of the compressor through an oil return pipe of the oil separator, and the separated refrigeration oil and the return air of the compressor return to the compressor together, so that the abrasion of the compressor caused by oil shortage in the operation process is prevented.
The existing air conditioning system has the problem that the oil separation efficiency of an oil separator is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides an air conditioning system now, there is the lower problem of oil separator's oil separating efficiency.
To solve the above problems, the present invention provides an air conditioning system including a plurality of oil separators, a plurality of compressors, and a plurality of switches, the turning on or off of which switches the plurality of oil separators between a parallel connection and a series connection, wherein,
the parallel connection of the plurality of oil separators includes:
the air inlets of the oil separators are respectively communicated with the corresponding compressor exhaust ports, and the air outlets of the oil separators are communicated with the refrigerant main circulation pipeline;
the series connection of the plurality of oil separators includes:
the oil separators are communicated through pipelines which are connected end to end in sequence in the flowing direction of the refrigerant.
The pipeline connecting mode of the oil separator is changed by controlling the on-off of the switch, so that the pipeline connecting mode of the oil separator is consistent with the current running state of the air-conditioning system, the oil return effect of the compressor is guaranteed while the oil separation efficiency is improved, frequent oil return of the air-conditioning system in the running process is avoided, and the system can output cold and hot for a long time.
Optionally, the plurality of oil separators are sequentially connected end to end in the flow direction of the refrigerant, and a switch is arranged between the connected oil separators;
the air inlets of the oil separators are connected with the air outlets of the compressors corresponding to the oil separators, the air inlet of the first oil separator in the oil separators is also connected with the air outlets of other compressors except the compressor corresponding to the first oil separator in the compressors, and a switch is arranged between the connected air inlet of the oil separator and the air outlet of the compressor;
the air outlets of the oil separators are all connected to the refrigerant main circulation pipeline, and a switch is arranged on a connecting passage of each oil separator connected to the refrigerant main circulation pipeline.
The pipeline connecting mode of the oil separator is changed by controlling the on-off of the switch, so that the pipeline connecting mode of the oil separator is consistent with the current running state of the air-conditioning system, the oil return effect of the compressor is guaranteed while the oil separation efficiency is improved, frequent oil return of the air-conditioning system in the running process is avoided, and the system can output cold and hot for a long time.
Optionally, the air conditioning system comprises a first oil separator and a first compressor corresponding thereto, a second oil separator and a second compressor corresponding thereto;
the air outlet of the first oil separator is connected with the air inlet of the second oil separator, and the air outlet of the first oil separator and the air outlet of the second oil separator are both connected to a refrigerant main circulation pipeline;
the air inlet of the first oil separator is connected with the air outlet of the first compressor, the air inlet of the second oil separator is also connected with the air outlet of the second compressor, and the air inlet of the first oil separator is also connected with the air outlet of the second compressor;
a first switch is arranged between the air outlet of the first oil separator and the air inlet of the second oil separator, a second switch is arranged on a connecting passage of the air outlet of the first oil separator connected to a refrigerant main circulation pipeline, a third switch is arranged between the air inlet of the second oil separator and the air outlet of the second compressor, and a fourth switch is arranged between the air inlet of the first oil separator and the air outlet of the second compressor.
The pipeline connecting mode of the oil separator is changed by controlling the on-off of the first switch, the second switch, the third switch and the fourth switch, so that the pipeline connecting mode of the oil separator is consistent with the current running state of the air-conditioning system, the oil return effect of the compressor is ensured while the oil separation efficiency is improved, frequent oil return of the air-conditioning system in the running process is avoided, and the system can output cold and heat for a long time.
Optionally, the air conditioning system further comprises a third oil separator and a corresponding third compressor thereof;
the air inlet of the third oil separator is connected with the air outlet of the second oil separator, and the air outlet of the third oil separator is connected to a refrigerant main circulation pipeline;
the air inlet of the third oil separator is also connected with the air outlet of the third compressor, and the third compressor is connected with the air inlet of the first oil separator;
a fifth switch is arranged between the air inlet of the third oil separator and the air outlet of the second oil separator, a sixth switch is arranged between the air inlet of the third oil separator and the air outlet of the third compressor, a seventh switch is arranged between the third compressor and the air inlet of the first oil separator, and an eighth switch is arranged on a connecting passage of the second oil separator connected to a refrigerant main circulation pipeline.
The pipeline connection mode of the oil separator is changed by controlling the on-off of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, so that the pipeline connection mode of the oil separator is consistent with the current operation state of the air conditioning system, the oil return effect of the compressor is ensured while the oil separation efficiency is improved, frequent oil return of the air conditioning system in the operation process is avoided, and the system can output cold and heat for a long time.
Optionally, the switch is a solenoid valve. The electromagnetic valve can realize complete disconnection and complete conduction of flow, is simple to realize, has low cost, can effectively control the connection and disconnection of related pipelines, and avoids the adverse effects on oil return control caused by flow leakage and the like.
Optionally, the oil return conduits of the plurality of oil separators are in communication with one another. The oil separated by each oil separator is gathered at the communication position of the oil return pipeline, so that the gathered oil can be redistributed.
Optionally, the air conditioning system further includes a plurality of oil return throttling elements correspondingly connected to oil return ports of the compressors, and the plurality of oil return throttling elements are connected with the communicated oil return pipelines. Through setting up a plurality of return oil throttling element of connecting each compressor oil return opening, adjust oil return pressure and oil return temperature, avoid because of the unable oil return that compressor oil return opening pressure is too high leads to.
Optionally, the scavenge throttling element is an scavenge capillary. The oil return pressure and the oil return temperature can be adjusted while the cost is saved.
Optionally, a solenoid valve is disposed between each oil return throttling element and its corresponding compressor. Non-oil substances in the oil separator can be prevented from entering the compressor, and the safety of the compressor machine can be maintained.
Optionally, a return valve is disposed between the plurality of return-flow throttling elements and the communicated return line. The oil return can be realized according to the requirement, and the unit performance of the air conditioner is improved.
Drawings
Fig. 1 is a schematic view of an embodiment of the air conditioning system structure of the present invention;
FIG. 2 is a schematic view of an embodiment of compressor discharge flow with oil separators connected in series;
fig. 3 is a schematic view showing an example of the flow direction of the compressor discharge gas in which the oil separators are connected in parallel.
Description of reference numerals:
1-a first oil separator, 2-a second oil separator, 3-a first compressor, 4-a second compressor, 5-a first switch, 6-a second switch, 7-a third switch, 8-a fourth switch and 9-an oil return throttling element.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
The oil separator is positioned behind the exhaust port of the compressor and used for separating high-pressure refrigerant and refrigeration oil from the exhaust port of the compressor and reducing the amount of refrigeration oil entering the refrigeration circuit/heating circuit. In order to guarantee the performance and the operational reliability of the air conditioning unit, the embodiment of the utility model discloses adopt two or more oil separators to carry out press exhaust oil return (for the air conditioning system of two compressors, two oil separators as shown in fig. 1).
In the specific implementation of separating and returning oil by adopting two or more oil separators, if a mode that all the oil separators are connected in parallel is adopted, namely, a single oil separator is used for separating oil of a single press, an air inlet of the oil separator is connected with an air outlet of the corresponding press, the exhaust of each compressor is only separated from the refrigerant once, and the separation mode has limited separation efficiency due to the fact that the refrigerant gas exhausted from the oil separator still carries certain refrigerant oil, and the refrigerant oil enters a pipeline. When the compressor operates at high frequency, most of the refrigeration oil entering the pipeline returns to the compressor along with the return air of the compressor due to large high-low pressure difference, so that the compressor can operate for a long time without oil shortage. When the compressor runs at low frequency for a long time, most of the refrigeration oil entering the pipeline cannot return to the compressor along with return air due to small high-low pressure difference of the system, so that the system has to forcibly perform oil return program operation at regular intervals to return the refrigeration oil in the pipeline to the compressor, and frequent oil return can influence the use experience of a user.
If the mode of connecting all the oil separators in series is adopted, namely the outlet end of the previous oil separator is connected with the inlet end of the next oil separator between the oil separators, the mode can carry out multi-stage oil separation on the compressor exhaust gas, so that the refrigeration oil carried in the compressor exhaust gas can be separated out in the oil separators as far as possible, but the exhaust pressure loss of the compressor is large due to the pipe diameters of the inlet and the outlet of the oil separator and the capacity limitation of the oil separator.
In view of the above-mentioned merit shortcoming of oil separator "parallelly connected", "establish ties", the utility model discloses a set up flow switch (as the solenoid valve) in the refrigerant pipeline, switch on and break off through control flow switch, realize a plurality of oil separators and establish ties and parallelly connected conversion, through the analysis to air conditioning system operating parameter, change oil separator's pipe connection mode, make oil separator pipe connection mode conform with air conditioning system current running state, and then when improving oil separation efficiency, guarantee the oil return effect of compressor, avoid air conditioning system frequent oil return at the operation in-process, make the system can carry out cold and hot output for a long time.
The embodiments of the related structure and control of the present invention are described below.
The utility model provides an air conditioning system.
The air conditioning system includes a plurality of oil separators, a plurality of compressors, and a plurality of switches, the turning on or off of the plurality of switches switching the plurality of oil separators between a parallel connection and a series connection, wherein the parallel connection of the plurality of oil separators includes: the air inlets of the oil separators are respectively communicated with the corresponding compressor exhaust ports, and the air outlets of the oil separators are communicated with the refrigerant main circulation pipeline; the series connection of the plurality of oil separators includes: the oil separators are communicated through pipelines which are connected end to end in sequence in the flowing direction of the refrigerant.
The oil separator is arranged at the exhaust port end of the compressor, the high-pressure refrigerant enters the oil separator after being discharged from the exhaust port of the compressor to be separated from the refrigeration oil, and the separated refrigerant enters the heat exchanger or the four-way valve after coming out of the oil separator to be output for cooling or heating.
The plurality of oil separators refers to two or more oil separators, the number of the compressors is equal to that of the oil separators, and each oil separator is provided with a corresponding compressor. Switches are arranged among the oil separators and between the oil separators and the compressors, and the connection and disconnection of the connecting passages among the oil separators and between the oil separators and the compressors are realized by controlling the disconnection and the connection of some switches, wherein the switches refer to flow switches.
In the mode that the oil separators are connected in parallel, each oil separator performs refrigerant and frozen oil separation on the exhaust gas of the corresponding compressor, so that the air inlet of each oil separator is communicated with the exhaust port of the corresponding compressor, the air outlet of each oil separator is communicated with the refrigerant main circulation pipeline, the exhaust gas of each compressor enters the corresponding oil separator, and after the oil is separated by the corresponding oil separator, the exhaust gas passes through the air outlet of each oil separator and enters the refrigerant main circulation pipeline.
In the mode of connecting the oil separators in series, the exhaust gas of the compressors passes through the oil separators connected in series to carry out multi-stage oil separation, the oil separators are sequentially connected end to end in the flowing direction of the refrigerant, namely, the gas outlet of the previous oil separator is connected with the gas inlet of the next oil separator, and the gas outlets of all the compressors are connected with the gas inlet of the first oil separator in the oil separators, so that the exhaust gas of all the compressors enters from the first oil separator, and the multi-stage oil separation is carried out in the oil separators connected in series.
Through setting up a plurality of oil separators and a plurality of compressors to set up a plurality of switches wherein, realize the switching between oil separator series connection and the parallel connection through control switch break-make, can make oil separator pipe connection mode conform with air conditioning system current running state, and then when improving oil separation efficiency, guarantee the oil return effect of compressor, avoid air conditioning system frequent oil return at the operation in-process, make the system can carry out cold and hot output for a long time.
Optionally, the plurality of oil separators are sequentially connected end to end in the flow direction of the refrigerant, and a switch is arranged between the connected oil separators; the refrigerant flows from the previous oil separator to the next oil separator, and a switch is arranged between the connected oil separators, namely between two adjacent oil separators, so that the disconnection and the conduction of a connecting passage between the two adjacent oil separators are controlled.
The air inlets of the oil separators are connected with the air outlets of the compressors corresponding to the oil separators, the air inlet of the first oil separator in the oil separators is also connected with the air outlets of other compressors except the compressor corresponding to the first oil separator in the compressors, and a switch is arranged between the connected air inlet of the oil separator and the air outlet of the compressor; the air outlets of the oil separators are all connected to the refrigerant main circulation pipeline, and a switch is arranged on a connecting passage of each oil separator connected to the refrigerant main circulation pipeline.
The serial connection among the oil separators can be realized by controlling the switch conduction on the connecting passage between the oil separators, the switch conduction on the connecting passage of the air inlet of the first oil separator and the air outlet of other compressors except the corresponding compressor, and simultaneously, controlling the switch disconnection between the air inlet of the oil separator and the switch disconnection on the connecting passage of the air outlet of the corresponding compressor (the switch conduction between the air inlet of the first oil separator and the air outlet of the corresponding compressor), and the switch disconnection between the air outlets of the oil separators and the connecting passage of the refrigerant main circulation pipeline (the switch conduction between the air outlet of the last oil separator and the connecting passage of the refrigerant main circulation pipeline); on the contrary, the parallel connection among the oil separators can be realized by controlling the switch on the connecting passage to be disconnected, the switch on the connecting passage of the air inlet of the first oil separator to be disconnected with the switch on the connecting passage of the air outlets of the compressors except the corresponding compressor, controlling the switch on the connecting passage of the air inlet of the oil separator to be conducted with the switch on the connecting passage of the air outlets of the corresponding compressors, and controlling the switch on the connecting passages of the air outlets of the oil separators to be connected with the refrigerant main circulation pipeline to be conducted.
Switching between series connection and parallel connection of the oil separators is achieved by controlling on-off of the switch, so that the pipeline connection mode of the oil separators conforms to the current operation state of the air conditioning system, the oil return effect of the compressor is guaranteed while the oil separation efficiency is improved, frequent oil return of the air conditioning system in the operation process is avoided, and the system can output cold and heat for a long time.
Alternatively, as shown in fig. 1, the air conditioning system includes a first oil separator 1 and a first compressor 3 corresponding thereto, a second oil separator 2 and a first compressor 4 corresponding thereto;
the air outlet of the first oil separator 1 is connected with the air inlet of the second oil separator 2, and the air outlet of the first oil separator 1 and the air outlet of the second oil separator 2 are both connected to a refrigerant main circulation pipeline; the air inlet of the first oil separator 1 is connected with the air outlet of the first compressor 3, the air inlet of the second oil separator 2 is also connected with the air outlet of the first compressor 4, and the air inlet of the first oil separator 1 is also connected with the air outlet of the first compressor 4; a first switch 5 is arranged between the air outlet of the first oil separator 1 and the air inlet of the second oil separator 2, a second switch 6 is arranged on a connecting passage of the air outlet of the first oil separator 1 connected to a refrigerant main circulation pipeline, a third switch 7 is arranged between the air inlet of the second oil separator 2 and the air outlet of the first compressor 4, and a fourth switch 8 is arranged between the air inlet of the first oil separator 1 and the air outlet of the first compressor 4.
The first oil separator 1 is the first oil separator, and therefore, its air inlet is connected only to the compressor air outlet, and not to the oil separator, and a switch may be provided or not provided between the first oil separator 1 and its corresponding compressor, and the first oil separator is kept in a normally open state. Alternatively, as shown in fig. 1, the second oil separator 2 is the last oil separator, and the air outlet of the last oil separator is only connected to the refrigerant main circulation pipeline and is not connected with the oil separator.
When the oil separators are connected in series, the first switch 5 and the fourth switch 8 are conducted, and the second switch 6 and the third switch 7 are disconnected; when the oil separators are connected in parallel, the first switch 5 and the fourth switch 8 are turned off, and the second switch 6 and the third switch 7 are turned on.
The switch of the utility model discloses each embodiment, optionally be the solenoid valve, also can be the component of steerable refrigerant flow break-make such as electronic expansion valve.
The connection mode between the oil separators can be switched by controlling the on-off of the switch. In summary, when the oil separators are connected in series, the first switch 5 and the fourth switch 8 are turned on, the second switch 6 and the third switch 7 are turned off, and the communicated pipelines are: between the air outlet of the first oil separator 1 and the air inlet of the second oil separator 2, between the air inlet of the first oil separator 1 and the air outlet of the first compressor 4; when the oil separators are connected in parallel, the first switch 5 and the fourth switch 8 are disconnected, the second switch 6 and the third switch 7 are connected, and communicated pipelines are as follows: the gas outlet of the first oil separator 1 is connected to a connection passage of a refrigerant main circulation pipeline, and the gas inlet of the second oil separator 2 is connected to the gas outlet of the first compressor 4.
Fig. 2 is a schematic view showing an example of the flow direction of the compressor discharge gas in the case where the oil separators are connected in series.
Wherein, all compressor exhausts are converged at the third switch 7, the converged compressor exhausts firstly enter the first oil separator 1 for primary gas-oil separation, most of refrigeration oil is separated, and the compressor exhausts after the primary gas-oil separation enter the second oil separator 2 through the one-way valve and the first switch 5 for secondary gas-oil separation. The compressor exhaust gas is subjected to gas-oil separation twice, so that the refrigeration oil carried in the compressor exhaust gas can be separated in the oil separator as far as possible.
Fig. 3 is a schematic view showing an example of the flow direction of the compressor discharge gas in the case where the oil separators are connected in parallel.
Wherein, the exhaust gas of the first compressor 3, the second compressor 4 enters the first oil separator 1, the second oil separator 2 separately, and separate the gas-oil separately, the exhaust gas from the first oil separator 1 is joined with the exhaust gas from the second oil separator 2 through the second switch 6, then flow to the refrigerant main circulation pipeline. Wherein, the refrigerant main circulation pipeline refers to a refrigerant circulation loop comprising elements such as a four-way valve, a heat exchanger and the like.
Flow switches, namely a first switch 5, a second switch 6, a third switch 7 and a fourth switch 8 are arranged in a refrigerant pipeline, and the pipeline connection mode of the oil separator is changed by controlling the on-off of the first switch 5, the second switch 6, the third switch 7 and the fourth switch 8, so that the pipeline connection mode of the oil separator is consistent with the current operation state of the air conditioning system, the oil separation efficiency is improved, the oil return effect of the compressor is ensured, frequent oil return of the air conditioning system in the operation process is avoided, and the system can output cold and heat for a long time.
Optionally, the air conditioning system further comprises a third oil separator and a corresponding third compressor thereof;
the air inlet of the third oil separator is connected with the air outlet of the second oil separator 2, and the air outlet of the third oil separator is connected to a refrigerant main circulation pipeline; the air inlet of the third oil separator is also connected with the air outlet of a third compressor, and the third compressor is connected with the air inlet of the first oil separator 1; a fifth switch is arranged between the air inlet of the third oil separator and the air outlet of the second oil separator 2, a sixth switch is arranged between the air inlet of the third oil separator and the air outlet of the third compressor, a seventh switch is arranged between the third compressor and the air inlet of the first oil separator 1, and an eighth switch is arranged on a connecting passage of the second oil separator 2 connected to a refrigerant main circulation pipeline.
The second oil separator 2 is arranged between the first oil separator 1 and the third oil separator, and the first oil separator 1, the second oil separator 2 and the third oil separator are sequentially connected end to end.
When the oil separators are connected in series, the fifth switch is connected with the seventh switch, and the sixth switch is disconnected with the eighth switch, namely, the exhausted air of the compressor enters the second oil separator 2 after being subjected to first-stage separation in the first oil separator 1, and enters the third oil separator for third-stage separation after being subjected to second-stage separation in the second oil separator 2; when the oil separators are connected in parallel, the fifth switch is disconnected and conducted with the seventh switch, and the sixth switch is conducted with the eighth switch, namely, each oil separator is responsible for oil separation of the exhaust gas of the corresponding compressor, and the exhaust gas of the corresponding compressor directly flows to the refrigerant main circulation pipeline after being separated by each oil separator.
Optionally, the third oil separator is the last oil separator, and an air outlet of the third oil separator is directly connected with the refrigerant main circulation pipeline; optionally, an oil separator is further arranged behind the third oil separator, and an air outlet of the third oil separator is connected with an air inlet of the following oil separator and is further connected with the refrigerant main circulation pipeline, wherein switches are arranged in a connecting passage of the air outlet of the third oil separator, the air inlet of the following oil separator and the refrigerant main circulation pipeline.
The pipeline connecting mode of the oil separator is changed by controlling the on-off of the flow switch, so that the pipeline connecting mode of the oil separator is consistent with the current running state of the air conditioning system, the oil return effect of the compressor is guaranteed while the oil separation efficiency is improved, frequent oil return of the air conditioning system in the running process is avoided, and the system can output cold and hot for a long time.
Optionally, the switch is a solenoid valve.
The utility model discloses the switch in each embodiment, including first switch 5, second switch 6, third switch 7, four switches, fifth switch, sixth switch, seventh switch be the solenoid valve.
The solenoid valves can be selected from direct-acting solenoid valves, distributed direct-acting solenoid valves and pilot-operated solenoid valves. The electromagnetic valve can realize complete disconnection and complete conduction of flow, is simple to realize, has low cost, can effectively control the connection and disconnection of related pipelines, and avoids the adverse effects on oil return control caused by flow leakage and the like.
Optionally, the oil return conduits of the plurality of oil separators are in communication with one another.
Each oil separator is provided with an oil return pipeline, the oil return pipelines of the oil separators are communicated, the oil separated by each oil separator is gathered at the communicated part of the oil return pipeline, and the gathered oil can be redistributed.
Optionally, the air conditioning system further comprises an oil storage tank, oil return pipelines of all oil separators are communicated with each other and then guide oil into the oil storage tank, separated refrigeration oil is stored in the oil storage tank, an oil pump is used for pumping the refrigeration oil from the oil storage tank to the compressor, and a manual needle valve can be used for accurately controlling the quantity of the refrigeration oil returning to the compressor, so that different control purposes are achieved.
Optionally, the air conditioning system further includes a plurality of oil return throttling elements 9 correspondingly connected to oil return ports of the compressors, and the plurality of oil return throttling elements 9 are connected to the communicated oil return pipelines.
In order to ensure that the refrigeration oil in the oil separator can uniformly return to each compressor and avoid oil shortage of a certain compressor due to unbalanced oil return of the compressor, oil return pipelines of the separators are communicated with each other, so that the refrigeration oil in each oil separator is gathered from the oil return pipe and then returns to each compressor respectively.
By arranging the oil return throttling elements 9 connected with the oil return ports of the compressors, the oil return pressure and the oil return temperature are adjusted, and the condition that oil cannot return due to overhigh pressure of the oil return ports of the compressors is avoided. Wherein the return oil restriction element 9 may be an electronic expansion valve.
Optionally, the scavenge throttling element 9 is a scavenge capillary.
The oil return throttling element 9 is set as an oil return capillary tube, so that the oil return pressure and the oil return temperature can be adjusted while the cost is saved.
Optionally, a solenoid valve is provided between each scavenge throttling element 9 and its corresponding compressor.
When the compressor is started, the oil return electromagnetic valve is controlled to be opened, and when the compressor is closed, the oil return electromagnetic valve is controlled to be closed. By arranging the electromagnetic valves between the oil return throttling element 9 and each corresponding compressor, the oil return pipeline is conducted when the compressor runs, and the oil return pipeline is disconnected when the compressor stops, so that non-oil substances in the oil separator can be prevented from entering the compressor, and the safety of the compressor machine can be maintained.
Optionally, a return valve is arranged between the plurality of return throttling elements 9 and the communicating return pipe.
By providing a scavenge valve between the scavenge throttling element 9 and the communicating scavenge line, the amount of refrigeration oil returning to the compressor can be adjusted. Alternatively, an oil level detection device may be arranged in the oil separator for detecting the oil level of the oil separator, acquiring the oil level of the oil separator, the oil level of the compressor and the operating frequency of the compressor, determining the opening degree of the oil return valve, and controlling the opening degree of the oil return valve to perform corresponding control. The oil return valve has the advantages that oil return according to needs can be achieved, unit performance of the air conditioner is improved, in addition, the opening degree of the oil return valve is determined according to the current oil level and the operation frequency of the compressor, stable flowing of the refrigeration oil under the pressure difference of two sides of the oil return valve can be guaranteed through the opening degree, stable oil return is achieved, and reliability of the compressor is improved.
Optionally, a return valve is arranged between the plurality of return throttling elements 9 and the communicating return pipe.
By providing a scavenge valve between the scavenge throttling element 9 and the communicating scavenge line, the amount of refrigeration oil returning to the compressor can be adjusted. Alternatively, an oil level detection device may be arranged in the oil separator for detecting the oil level of the oil separator, acquiring the oil level of the oil separator, the oil level of the compressor and the operating frequency of the compressor, determining the opening degree of the oil return valve, and controlling the opening degree of the oil return valve to perform corresponding control. The oil return valve has the advantages that oil return according to needs can be achieved, unit performance of the air conditioner is improved, in addition, the opening degree of the oil return valve is determined according to the current oil level and the operation frequency of the compressor, stable flowing of the refrigeration oil under the pressure difference of two sides of the oil return valve can be guaranteed through the opening degree, stable oil return is achieved, and reliability of the compressor is improved.
The control method is applied to the air conditioning system in the above embodiments.
The control method comprises the following steps:
step S10, acquiring preset oil return control parameters, wherein the preset oil return control parameters comprise at least one of the operation frequency of the compressor and the height of the oil level of the compressor;
in the operation process of the air conditioning system, if the preset oil return control parameter comprises the operation frequency of the compressor and/or the height of the oil level of the compressor, the operation frequency of the compressor and/or the height of the oil level of the compressor can be obtained in real time or at regular time.
And step S20, determining corresponding oil content connection modes according to the preset oil return control parameters, wherein the oil content connection modes comprise series connection and parallel connection.
When the preset oil return control parameter includes the compressor operation frequency, the corresponding oil content connection mode may be directly determined based on the compressor operation frequency, and optionally, the step S20 includes:
step S200, when the running frequency of the compressor is greater than or equal to a preset value, the corresponding oil content connection mode is parallel connection;
the outdoor unit operates at high load, the compressor has high operation frequency, the displacement is large, the high-low pressure difference is large, and most of the refrigeration oil entering the pipeline can return to the compressor along with the return air. At this time, the oil can be fully returned by the parallel connection. If the oil separators are connected in series, the pressure loss of the compressor is too large due to the pipe diameters of the inlet and the outlet of the oil separators and the capacity limitation of the oil separators, and the refrigeration/heating effect is greatly influenced.
Step S201, when the operation frequency of the compressor is smaller than a preset value, the corresponding oil content connection mode is series connection.
The outdoor unit runs at low load, the running frequency of the compressor is low, the exhaust is less, the high-low pressure difference is small, most of the refrigeration oil entering the pipeline cannot return to the compressor along with return air, the compressor exhaust can be subjected to multi-stage oil separation through the oil separators connected in series, the refrigeration oil carried in the compressor exhaust can be separated out in the oil separators as far as possible, the refrigeration oil entering the pipeline is reduced as far as possible, frequent oil return of an air conditioning system in the running process is avoided, and the system can output cold and heat for a long time.
When the preset oil return control parameter includes a compressor oil level height, the corresponding oil connection manner may be determined directly based on the compressor oil level height, and optionally, step S20 includes:
step S210, when the height of the oil level of the compressor is greater than or equal to a preset height, the corresponding oil content connection mode is parallel connection;
when the oil level of the compressor is high, the compressor is far away from an oil shortage state, the oil return requirement is not high, and at the moment, in order to avoid the loss of the exhaust pressure of the compressor caused by series connection, the oil separators are selected to be connected in parallel.
And S211, when the height of the oil level of the compressor is smaller than a preset height, the corresponding oil content connection modes are in series connection.
When the oil level of the compressor is low, the compressor is close to an oil shortage state, the oil return requirement is high, and at the moment, the oil separators are selected to be connected in series to avoid damage to the compressor caused by oil shortage of the compressor.
When the preset oil return control parameters comprise the operation frequency of the compressor and the height of the oil level of the compressor, the parallel connection can be selected when the operation frequency of the compressor is greater than or equal to a first preset value, or the height of the oil level of the compressor is greater than or equal to a second preset value, and the series connection can be selected when the operation frequency of the compressor is less than the first preset value and the height of the oil level of the compressor is less than the second preset value.
Optionally, step S20 specifically includes:
step S220, if the oil content connection mode is series connection, controlling the first switch and the fourth switch to be turned on, and controlling the second switch and the third switch to be turned off;
step S221 of controlling the first switch and the fourth switch to be turned off and the second switch and the third switch to be turned on if the oil separation connection is parallel connection.
The first switch 5 and the fourth switch 8 are controlled to be switched on, and the second switch 6 and the third switch 7 are controlled to be switched off, so that pipelines between the air outlet of the first oil separator 1 and the air inlet of the second oil separator 2 and between the air inlet of the first oil separator 1 and the air outlet of the first compressor 4 can be communicated, and the multi-stage oil separation of the compressor exhaust gas can be carried out in a plurality of oil separators. Optionally, when the air conditioning system includes a third oil separator, the fifth switch is turned on and the seventh switch is turned on, and the sixth switch is turned off and the eighth switch is turned off.
The first switch 5 and the fourth switch 8 are controlled to be disconnected, the second switch 6 and the third switch 7 are controlled to be conducted, the air outlet of the first oil separator 1 can be connected to a connecting passage of a refrigerant main circulation pipeline, a pipeline between the air inlet of the second oil separator and the air outlet of the first compressor 4 is communicated, and therefore the exhaust air of each compressor is separated in the corresponding oil separator. Optionally, when the air conditioning system includes a third oil separator, the fifth switch is turned off and is in conduction with the seventh switch, and the sixth switch is in conduction with the eighth switch.
Through analyzing the preset oil return control parameters of the air conditioning system and selecting the pipeline connection mode which is consistent with the current operation state of the air conditioning system, the oil return effect of the compressor is ensured while the oil separation efficiency is improved, frequent oil return of the air conditioning system in the operation process is avoided, and the system can output cold and hot for a long time.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. An air conditioning system characterized by comprising a plurality of oil separators, a plurality of compressors, and a plurality of switches, the turning on or off of which switches the plurality of oil separators between parallel connection and series connection, wherein,
the parallel connection of the plurality of oil separators includes:
the air inlets of the oil separators are respectively communicated with the corresponding compressor exhaust ports, and the air outlets of the oil separators are communicated with the refrigerant main circulation pipeline;
the series connection of the plurality of oil separators includes:
the oil separators are communicated through pipelines which are connected end to end in sequence in the flowing direction of the refrigerant.
2. The air conditioning system of claim 1, wherein the plurality of oil separators are connected end to end in sequence in the direction of refrigerant flow, and a switch is provided between the connected oil separators;
the air inlets of the oil separators are connected with the air outlets of the compressors corresponding to the oil separators, the air inlet of the first oil separator in the oil separators is also connected with the air outlets of other compressors except the compressor corresponding to the first oil separator in the compressors, and a switch is arranged between the connected air inlet of the oil separator and the air outlet of the compressor;
the air outlets of the oil separators are all connected to the refrigerant main circulation pipeline, and a switch is arranged on a connecting passage of each oil separator connected to the refrigerant main circulation pipeline.
3. Air conditioning system according to claim 1, characterized in that it comprises a first oil separator (1) and a first compressor (3) corresponding thereto, a second oil separator (2) and a second compressor (4) corresponding thereto;
the air outlet of the first oil separator (1) is connected with the air inlet of the second oil separator (2), and the air outlet of the first oil separator (1) and the air outlet of the second oil separator (2) are both connected to a refrigerant main circulation pipeline;
the air inlet of the first oil separator (1) is connected with the air outlet of the first compressor (3), the air inlet of the second oil separator (2) is also connected with the air outlet of the second compressor (4), and the air inlet of the first oil separator (1) is also connected with the air outlet of the second compressor (4);
a first switch (5) is arranged between the air outlet of the first oil separator (1) and the air inlet of the second oil separator (2), a second switch (6) is arranged on a connecting passage of the air outlet of the first oil separator (1) connected to a refrigerant main circulation pipeline, a third switch (7) is arranged between the air inlet of the second oil separator (2) and the air outlet of the second compressor (4), and a fourth switch (8) is arranged between the air inlet of the first oil separator (1) and the air outlet of the second compressor (4).
4. The air conditioning system of claim 3, further comprising a third oil separator and its corresponding third compressor;
the air inlet of the third oil separator is connected with the air outlet of the second oil separator (2), and the air outlet of the third oil separator is connected to a refrigerant main circulation pipeline;
the air inlet of the third oil separator is also connected with the air outlet of a third compressor, and the third compressor is connected with the air inlet of the first oil separator (1);
a fifth switch is arranged between the air inlet of the third oil separator and the air outlet of the second oil separator (2), a sixth switch is arranged between the air inlet of the third oil separator and the air outlet of the third compressor, a seventh switch is arranged between the third compressor and the air inlet of the first oil separator (1), and an eighth switch is arranged on a connecting passage of the second oil separator (2) connected to a refrigerant main circulation pipeline.
5. The air conditioning system as claimed in any one of claims 1 to 4, wherein the switch is a solenoid valve.
6. An air conditioning system as set forth in any of claims 1-4 wherein said plurality of oil separator return conduits are in communication with one another.
7. Air conditioning system according to claim 6, characterized in that it further comprises a plurality of scavenge throttling elements (9) connected to each compressor scavenge port, said plurality of scavenge throttling elements (9) being connected to said communicating scavenge line.
8. Air conditioning system according to claim 7, characterised in that the return throttling element (9) is a return capillary tube.
9. Air conditioning system according to claim 7, characterised in that a solenoid valve is provided between each return throttling element (9) and its corresponding compressor.
10. Air conditioning system according to claim 7, characterized in that a return valve is arranged between the return throttling elements (9) and the communicating return line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922362885.0U CN211400406U (en) | 2019-12-25 | 2019-12-25 | Air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922362885.0U CN211400406U (en) | 2019-12-25 | 2019-12-25 | Air conditioning system |
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| CN211400406U true CN211400406U (en) | 2020-09-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926068A (en) * | 2019-12-25 | 2020-03-27 | 宁波奥克斯电气股份有限公司 | Air conditioning system and control method thereof |
| CN112943613A (en) * | 2021-04-09 | 2021-06-11 | 广州烈得高压缩机有限公司 | All-weather screw compressor |
-
2019
- 2019-12-25 CN CN201922362885.0U patent/CN211400406U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926068A (en) * | 2019-12-25 | 2020-03-27 | 宁波奥克斯电气股份有限公司 | Air conditioning system and control method thereof |
| CN112943613A (en) * | 2021-04-09 | 2021-06-11 | 广州烈得高压缩机有限公司 | All-weather screw compressor |
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