CN107339780B - Control method and device for differential pressure of high-pressure side and low-pressure side of multi-connected air conditioner compressor and air conditioner - Google Patents
Control method and device for differential pressure of high-pressure side and low-pressure side of multi-connected air conditioner compressor and air conditioner Download PDFInfo
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- CN107339780B CN107339780B CN201710600846.2A CN201710600846A CN107339780B CN 107339780 B CN107339780 B CN 107339780B CN 201710600846 A CN201710600846 A CN 201710600846A CN 107339780 B CN107339780 B CN 107339780B
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Abstract
The embodiment of the invention provides a method and a device for controlling differential pressure of high-pressure side and low-pressure side of a multi-connected air conditioner compressor and an air conditioner, and belongs to the field of air conditioners. This multiple air conditioner includes: the method comprises the following steps that at least one outdoor unit and a plurality of indoor units connected with the at least one outdoor unit are adopted, and the method comprises the following steps: when the plurality of internal machines are shut down, determining the shutdown sequence of the plurality of internal machines; when the external machine stops, the actions of the electronic expansion valves of the internal machines are controlled according to the stop sequence of the internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor. The control method and device for the differential pressure of the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor and the air conditioner have low cost and do not generate redundant noise.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a method and a device for controlling differential pressure of high-pressure side and low-pressure side of a multi-connected air conditioner compressor and an air conditioner.
Background
A multi-connected air conditioning system generally includes one or more outdoor units and a plurality of outdoor units. Usually, each multi-split air conditioner indoor unit is provided with an electronic expansion valve, so that the indoor unit is independently turned on and off and the flow is regulated, and the optimal 'distribution on demand' of the whole multi-split air conditioner system is realized.
When the internal unit reaches the set temperature or is manually closed, the external unit needs to be stopped, namely the external unit can be 0. Because the compressor can only be safely started under the condition of less than a certain pressure difference (different compressors have different pressure differences, but generally not more than 0.5MPa), the pressure difference of the exhaust side and the return side (namely the high-low pressure side) of the compressor is ensured to be less than the design pressure difference by various modes when the whole multi-split air conditioning system is restarted. There are two ways to reduce the pressure differential on the high and low pressure sides of the compressor. One way is that when the capacity of the external unit needs to be 0, the electronic expansion valves of all the internal units are closed until the multi-split system receives a restart instruction, and the bypass electromagnetic valve of the external unit is opened to balance the pressure difference of the high-pressure side and the low-pressure side of the compressor. In another mode, the outer machine does not need a bypass electromagnetic valve, when the outer machine can be 0, all the inner machines are completely closed and then are opened to the initial opening again, and the pressure difference of the high-pressure side and the low-pressure side of the compressor is bypassed through the inner machines. The first mode has relatively high cost, and the second mode cancels the electromagnetic valve, so that the cost is low, but the external machine can just reach 0, the pressure difference of the high-pressure and low-pressure sides of the whole system is large, and the electronic expansion valve is opened to the initial opening degree to generate a rush of 'swishing' noise due to the air flow scouring, so that the use comfort of the air conditioner is influenced.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for controlling the pressure difference of the high-pressure side and the low-pressure side of a multi-connected air-conditioning compressor and an air conditioner.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling a differential pressure between high and low pressure sides of a compressor of a multi-type air conditioner, where the multi-type air conditioner includes: the method comprises the following steps that at least one outdoor unit and a plurality of indoor units connected with the at least one outdoor unit are adopted, and the method comprises the following steps: when the plurality of internal machines are shut down, determining the shutdown sequence of the plurality of internal machines; when the external machine stops, the actions of the electronic expansion valves of the internal machines are controlled according to the stop sequence of the internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor.
Preferably, the controlling the electronic expansion valves of the plurality of internal machines according to the shutdown sequence of the plurality of internal machines includes: controlling an electronic expansion valve of a first type of indoor unit in the plurality of indoor units to keep the opening degree unchanged; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the controlling the electronic expansion valves of the plurality of internal machines according to the shutdown sequence of the plurality of internal machines includes: comparing the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the controlling the electronic expansion valve of the last stopped internal machine according to the comparison result includes: when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged; and when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree.
Preferably, the controlling the electronic expansion valve of the second type of the plurality of internal machines to keep the opening degree unchanged for a predetermined time comprises: controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree.
The embodiment of the invention also provides a control device for the pressure difference of the high-pressure side and the low-pressure side of the compressor of the multi-connected air conditioner, and the multi-connected air conditioner comprises: at least one outer machine and with many interior machines of at least one outer machine connection, the device includes: the system comprises a detection unit and a control unit, wherein the detection unit is used for determining the shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown; and the control unit is used for controlling the actions of the electronic expansion valves of the plurality of internal machines according to the shutdown sequence of the plurality of internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor when the external machine is shutdown.
Preferably, the control unit is further configured to: controlling an electronic expansion valve of a first type of indoor unit in the plurality of indoor units to keep the opening degree unchanged; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the control unit is further configured to: comparing the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the control unit is further configured to: when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged; and when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree.
Preferably, the control unit is further configured to: controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree.
The embodiment of the invention also provides an air conditioner, which comprises the control device for the differential pressure of the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor.
By adopting the technical scheme, the invention provides a method and a device for controlling the differential pressure of the high-pressure side and the low-pressure side of the compressor of the multi-connected air conditioner and the air conditioner, wherein the multi-connected air conditioner comprises the following steps: the method comprises the following steps that at least one outdoor unit and a plurality of indoor units connected with the at least one outdoor unit are adopted, and the method comprises the following steps: when the plurality of internal machines are shut down, determining the shutdown sequence of the plurality of internal machines; when the external machine stops, the actions of the electronic expansion valves of the internal machines are controlled according to the stop sequence of the internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor. The control method and device for the differential pressure of the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor and the air conditioner have low cost and do not generate redundant noise.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a flowchart of a method for controlling differential pressure on high-pressure and low-pressure sides of a multi-split air conditioner compressor according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling differential pressure on high-pressure and low-pressure sides of a multi-connected air conditioner compressor according to another embodiment of the present invention;
fig. 3A to 3C are flowcharts of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention.
FIG. 4 is a flow chart of a method for controlling differential pressure between high and low pressure sides of a multi-connected air conditioner compressor according to another embodiment of the present invention; and
fig. 5 is a schematic structural diagram of a control device for differential pressure on high-pressure and low-pressure sides of a multi-split air conditioner compressor according to an embodiment of the present invention.
Description of the reference numerals
501 detection unit 502 control unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a method for controlling a pressure difference between high and low pressure sides of a compressor of a multi-connected air conditioner, where the multi-connected air conditioner includes: the method comprises the following steps that at least one outdoor unit and a plurality of indoor units connected with the at least one outdoor unit are adopted, and the method comprises the following steps: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S101); when the external machine stops, the actions of the electronic expansion valves of the internal machines are controlled according to the stop sequence of the internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor (step S102).
Because the multi-connected air conditioner has a plurality of internal machines, the internal machines are stopped in sequence. In the present invention, the internal machines are divided into two types, the first type of internal machine is one of the internal machines that is stopped last or a plurality of internal machines that are stopped last at the same time, the second type of internal machine is other internal machines except the first type of internal machine, and after the division, different controls are performed on the electronic expansion valves of the first type of internal machine and the second type of internal machine, which will be specifically described in detail below.
Fig. 2 is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention. As shown in fig. 2, the method includes: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S201); when the external machine stops, controlling an electronic expansion valve of a first type of internal machine in the plurality of internal machines to keep the opening degree unchanged (step S202); when the external machine stops, the electronic expansion valve of a second type of internal machine in the plurality of internal machines is controlled to act after the opening degree is kept unchanged for a preset time, wherein the stop time of the first type of internal machine is the same and is later than that of the second type of internal machine (step S103).
By adopting the control mode, the multi-split external unit does not need to add an additional bypass electromagnetic valve for pressure relief, and pressure balance is carried out through leakage quantity existing in the first type of internal unit and each valve body in the system. The multiple on-line machine generally all has the fan delay function, and when the machine was shut down promptly, the fan still can continuously blow a period to realize heat recovery and weather the evaporimeter condensation water, reduce the function that bacterial growing (under the refrigeration mode). Because the multi-split air conditioner has the fan delay function, even if the electronic expansion valve keeps a certain opening degree when the first type of inner machine is stopped, the refrigerant noise is still masked by the fan noise, and no extra noise is generated. Other multi-split air conditioner indoor units (second type indoor units) can not generate extra airflow noise because instantaneous pressure difference is not generated due to the opening of the electronic expansion valve because the opening degree of the electronic expansion valve is kept unchanged.
The preset time is preferably more than 1 minute, and is less than the shortest restart time after the external unit is stopped (the shortest restart time is different according to different air conditioners and is fixed for a certain air conditioner), and the shortest restart time is preferably 5-7 minutes.
Three examples of electronic expansion valve actuation for the second type of internal machine are provided below:
fig. 3A is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention. As shown in fig. 3A, the method includes: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S311); when the external machine is stopped, comparing the opening degree of an electronic expansion valve of a first type of internal machine in the internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result (step S312); and controlling the electronic expansion valve of the second type of the plurality of internal machines to close after keeping the opening degree unchanged for a preset time (step 313).
Fig. 3B is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention. As shown in fig. 3B, the method includes: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S321); when the external machine is stopped, comparing the opening degree of an electronic expansion valve of a first type of internal machine in the internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result (step S322); and controlling the electronic expansion valve of the second type of the internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time (step S323).
Fig. 3C is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention. As shown in fig. 3C, the method includes: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S331); when the external machine is stopped, comparing the opening degree of an electronic expansion valve of a first type of internal machine in the internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result (step S332); and controlling the electronic expansion valve of the second type of internal machine in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree (step S333).
Fig. 4 is a flowchart of a method for controlling a differential pressure between high and low pressure sides of a multi-split air conditioner compressor according to another embodiment of the present invention. As shown in fig. 4, the method includes: determining a shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown (step S401); when the external machine is stopped, judging whether the opening degree of an electronic expansion valve of a first type of internal machine in the multiple internal machines is larger than the initial opening degree of the electronic expansion valve required when the internal machine is started (step S402); when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged (step S403); when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree (step S404); and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and is later than that of the second type of internal machine (step S405).
In this embodiment, the opening degree of the electronic expansion valve of the first type of internal machine is adjusted to at least the initial opening degree of the electronic expansion valve required when the internal machine is started. When the opening degree of the electronic expansion valve of the first type indoor unit is larger than the initial opening degree, the opening degree is unchanged; and when the opening degree of the electronic expansion valve of the first-type indoor unit is smaller than the initial opening degree, controlling the electronic expansion valve to be opened to the initial opening degree.
Fig. 5 is a schematic structural diagram of a control device for differential pressure on high-pressure and low-pressure sides of a multi-split air conditioner compressor according to an embodiment of the present invention. The embodiment of the invention also provides a control device for the pressure difference of the high-pressure side and the low-pressure side of the compressor of the multi-connected air conditioner, and the multi-connected air conditioner comprises: at least one outer machine and with many interior machines of at least one outer machine connection, the device includes: the system comprises a detection unit 501 and a control unit 502, wherein the detection unit 501 is used for determining the shutdown sequence of the multiple internal machines when the multiple internal machines are shutdown; the control unit 502 is configured to control the actions of the electronic expansion valves of the multiple internal machines according to the shutdown sequence of the multiple internal machines when the external machine is shutdown, so as to control the pressure difference between the high-pressure side and the low-pressure side of the compressor.
Preferably, the control unit 502 is further configured to: controlling an electronic expansion valve of a first type of indoor unit in the plurality of indoor units to keep the opening degree unchanged; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the control unit 502 is further configured to: comparing the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines with the initial opening degree of the electronic expansion valve required when the internal machine is started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time, wherein the shutdown time of the first type of internal machine is the same and later than that of the second type of internal machine.
Preferably, the control unit 502 is further configured to: when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged; and when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree.
Preferably, the control unit 502 is further configured to: controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time; or controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree.
The embodiment of the invention also provides an air conditioner, which comprises the control device for the differential pressure of the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor.
By adopting the technical scheme, the invention provides a method and a device for controlling the differential pressure of the high-pressure side and the low-pressure side of the compressor of the multi-connected air conditioner and the air conditioner, wherein the multi-connected air conditioner comprises the following steps: the method comprises the following steps that at least one outdoor unit and a plurality of indoor units connected with the at least one outdoor unit are adopted, and the method comprises the following steps: when the plurality of internal machines are shut down, determining the shutdown sequence of the plurality of internal machines; when the external machine stops, the actions of the electronic expansion valves of the internal machines are controlled according to the stop sequence of the internal machines so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor. The control method and device for the differential pressure of the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor and the air conditioner have low cost and do not generate redundant noise.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A control method for the pressure difference of the high-pressure side and the low-pressure side of a compressor of a multi-connected air conditioner comprises the following steps: the method comprises the following steps of:
when the plurality of internal machines are shut down, determining the shutdown sequence of the plurality of internal machines;
when the external machine is stopped, comparing the opening degree of an electronic expansion valve of a first type of internal machine in the internal machines with the initial opening degree of the electronic expansion valve required when the internal machines are started, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor, wherein the shutdown time of the first type of internal machine is the same and is later than that of the second type of internal machine.
2. The method for controlling the differential pressure on the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor as claimed in claim 1, wherein after the shutdown sequence of the plurality of internal machines is determined, the method further comprises the following steps:
when the external machine stops, controlling an electronic expansion valve of a first type of internal machine in the multiple internal machines to keep the opening degree unchanged; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor, wherein the shutdown time of the first type of internal machine is the same and is later than that of the second type of internal machine.
3. The method for controlling the differential pressure on the high-pressure side and the low-pressure side of the multi-connected air-conditioning compressor according to claim 1, wherein the step of controlling the electronic expansion valve of the first type of indoor unit according to the comparison result comprises the following steps:
when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged;
and when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree.
4. The method for controlling the differential pressure on the high-pressure side and the low-pressure side of the multi-connected air conditioner compressor according to claim 1 or 2, wherein the action of controlling the electronic expansion valve of the second type of the plurality of internal machines to keep the opening degree unchanged for a preset time comprises the following steps:
controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time; or
Controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time; or
And controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree.
5. A control device for the pressure difference of the high-low pressure side of a multi-connected air conditioner compressor comprises: at least one outer machine and with many internal machines of at least one outer machine connection, its characterized in that, the device includes:
a detection unit and a control unit, wherein,
the detection unit is used for determining the shutdown sequence of the plurality of internal machines when the plurality of internal machines are shutdown;
the control unit is used for comparing the opening degree of an electronic expansion valve of a first type of internal machine in the internal machines with the initial opening degree of the electronic expansion valve required when the internal machines are started when the external machine stops, and controlling the action of the electronic expansion valve of the first type of internal machine according to the comparison result; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor, wherein the shutdown time of the first type of internal machine is the same and is later than that of the second type of internal machine.
6. The device for controlling the differential pressure between the high pressure side and the low pressure side of the multi-connected air conditioner compressor as recited in claim 5, wherein the control unit is further configured to:
when the external machine stops, controlling an electronic expansion valve of a first type of internal machine in the multiple internal machines to keep the opening degree unchanged; and controlling an electronic expansion valve of a second type of internal machine in the plurality of internal machines to act after keeping the opening degree unchanged for a preset time so as to control the pressure difference of the high-pressure side and the low-pressure side of the compressor, wherein the shutdown time of the first type of internal machine is the same and is later than that of the second type of internal machine.
7. The device for controlling the differential pressure between the high pressure side and the low pressure side of the multi-connected air conditioner compressor as recited in claim 5, wherein the control unit is further configured to:
when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is larger than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to keep the opening degree unchanged;
and when the opening degree of an electronic expansion valve of a first type of internal machine in the plurality of internal machines is smaller than the initial opening degree, controlling the electronic expansion valve of the first type of internal machine to be opened to the initial opening degree.
8. The device for controlling the differential pressure on the high-pressure side and the low-pressure side of the multi-connected air-conditioning compressor as claimed in claim 5 or 6, wherein the control unit is further used for:
controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time; or
Controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to be opened to the initial opening degree of the electronic expansion valve required when the internal machines are started after keeping the opening degree unchanged for a preset time; or
And controlling an electronic expansion valve of a second type of internal machines in the plurality of internal machines to close after keeping the opening degree unchanged for a preset time, and then opening to the initial opening degree.
9. An air conditioner is characterized in that the air conditioner comprises a control device for the pressure difference of the high-pressure side and the low-pressure side of a multi-connected air conditioner compressor, wherein the control device is as claimed in any one of claims 5 to 8.
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| CN201710600846.2A CN107339780B (en) | 2017-07-21 | 2017-07-21 | Control method and device for differential pressure of high-pressure side and low-pressure side of multi-connected air conditioner compressor and air conditioner |
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