CN112484233A

CN112484233A - Control method and device of direct expansion type air conditioning unit system and air conditioner

Info

Publication number: CN112484233A
Application number: CN202011364411.0A
Authority: CN
Inventors: 李宏波; 姜春苗; 陈宁寿; 杨金龙; 刘纯; 李业明
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-03-12
Anticipated expiration: 2040-11-27
Also published as: CN112484233B

Abstract

The invention relates to a control method and a device of a direct expansion type air conditioning unit system and an air conditioner, wherein the control method comprises the following steps: collecting equipment operation parameters of a direct expansion type air conditioning unit system; and adjusting the operation quantity of the equipment in the direct-expansion type air conditioning unit system according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate. The technical scheme provided by the application can realize the automatic operation of the direct-expansion air conditioning unit system without stopping the machine, thereby not only improving the working efficiency of the direct-expansion air conditioning unit system, but also improving the operability of the direct-expansion air conditioning unit system.

Description

Control method and device of direct expansion type air conditioning unit system and air conditioner

Technical Field

The invention belongs to the technical field of air conditioning units, and particularly relates to a control method and device of a direct expansion type air conditioning unit system and an air conditioner.

Background

The existing direct expansion unit group control system is provided with a direct expansion unit, a cooling water pump, a cooling tower fan, an electric butterfly valve and other control devices. The direct expansion air conditioning unit directly completes heat exchange between the refrigerant and the air to be treated without secondary heat exchange, namely, the refrigerant-air. The most common large central air conditioning system comprising a water chilling unit, an air conditioning terminal unit and the like has a heat exchange mode different from that of a direct expansion type air conditioning unit, but adopts a refrigerant-water-air mode, namely the refrigerant absorbs heat to water firstly to generate chilled water, the chilled water is conveyed to the terminal unit of a fan coil and the like in a room through a pipeline, and the fan in the unit circularly blows air to enable the indoor air to exchange heat with the chilled water in the coil to generate cold air to be blown down.

However, when the manual mode is switched to the automatic mode, the current group control system needs to shut down all the devices to switch to the automatic mode, which is inconvenient to operate and reduces the efficiency.

Disclosure of Invention

In view of the above, the present invention provides a method and an apparatus for controlling a direct-expansion air conditioning unit system, and an air conditioner, to solve the problem of inconvenient operation caused by the need to shut down all devices to switch to an automatic mode when a group control system in the prior art is switched from a manual mode to an automatic mode.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to a first aspect of embodiments of the present application, there is provided a control method of a direct-expansion air conditioning unit system, the method including:

collecting equipment operation parameters of a direct expansion type air conditioning unit system;

and adjusting the operation number of the equipment in the direct-expansion type air conditioning unit system according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate.

Further optionally, before adjusting the operation number of the devices in the direct-expansion air conditioning unit system according to the device operation parameters of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system, the method further includes:

judging whether the direct expansion type air conditioning unit system has an abnormal condition, if so, the direct expansion type air conditioning unit system cannot automatically operate; if the direct expansion type air conditioning unit system has no abnormal condition, adjusting the operation number of the equipment in the direct expansion type air conditioning unit system according to the equipment operation parameters of the direct expansion type air conditioning unit system so as to enable the direct expansion type air conditioning unit system to automatically operate.

Further optionally, the abnormal condition of the direct-expansion air conditioning unit system includes:

when the direct expansion unit is in an operating state, the PLC of the direct expansion air conditioning unit and all the direct expansion units have communication faults, and the time of the communication faults is more than or equal to a first time threshold value; communication faults occur among all PLC controllers in the direct expansion type air conditioning unit system, and the time of the communication faults is more than or equal to a second time threshold; the water pump of the direct expansion type air conditioning unit system is in a local state and is started by personnel; when the water pump of the direct expansion type air conditioning unit system is closed, the water pump is stuck and fails to be closed; when the direct expansion unit is in a local state and the direct expansion unit is started on site; when the electric butterfly valve is in a local state, the electric butterfly valve is opened to a position.

Further optionally, the adjusting the operation number of the devices in the direct-expansion air conditioning unit system according to the device operation parameters of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system includes:

acquiring the number of the currently running direct expansion unit and the number of the direct expansion unit activated in the automatic mode according to the equipment operation parameters of the direct expansion type air conditioning unit system;

judging whether the number of the currently running direct expansion unit is consistent with the number of the direct expansion unit activated by the automatic mode, if not, closing the direct expansion unit inconsistent with the number of the direct expansion unit activated by the automatic mode and/or opening the direct expansion unit corresponding to the number of the direct expansion unit activated by the automatic mode; and if the operation number of the direct expansion unit is consistent with the operation number of the direct expansion unit, keeping the operation number of the direct expansion unit currently operated.

Further optionally, the adjusting the operation number of the devices in the direct-expansion air conditioning unit system according to the device operation parameters of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system further includes:

acquiring the current operation number of water pumps, the current operation number of cooling towers and the number of the currently operated direct expansion units according to the equipment operation parameters of the direct expansion type air conditioning unit system;

respectively judging whether the current operation number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, and if the current operation number of the water pumps is equal to the number of the currently operated direct expansion units and the current operation number of the cooling towers is equal to the number of the currently operated direct expansion units, keeping the current operation number of the water pumps and the current operation number of the cooling towers; and if the running number of the water pumps is not equal to the number of the currently running direct expansion units or the running number of the cooling tower is not equal to the number of the currently running direct expansion units, controlling the current running number of the water pumps or the cooling tower so as to enable the current running number of the water pumps and the cooling tower to be equal to the number of the currently running direct expansion units.

Further optionally, the controlling the current operation number of the water pumps or the cooling towers to make the current operation number of the water pumps and the cooling towers equal to the number of the currently operated direct expansion units includes:

if the current operation number of the water pumps or the cooling towers is larger than the number of the currently operated direct expansion units, closing the currently operated water pumps or the cooling towers until the current operation number of the water pumps or the cooling towers is equal to the number of the currently operated direct expansion units;

and if the current operation number of the water pumps or the cooling towers is less than the number of the currently operated direct expansion units, opening the water pumps or the cooling towers which are not operated until the current operation number of the water pumps or the cooling towers is equal to the number of the currently operated direct expansion units.

acquiring the current operation number of electric butterfly valves, the current operation number of tail end air valves and the number of the currently operated direct expansion unit according to the equipment operation parameters of the direct expansion type air conditioning unit system;

respectively judging whether the current operation number of the electric butterfly valves and the tail end air valves is equal to the number of the currently operated direct expansion units, and if the current operation number of the electric butterfly valves is equal to the number of the currently operated direct expansion units and the current operation number of the tail end air valves is equal to the number of the currently operated direct expansion units, keeping the current operation number of the electric butterfly valves and the tail end air valves; if the current operation number of the electric butterfly valves is not equal to the number of the currently operated direct expansion units or the current operation number of the tail end air valves is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the electric butterfly valves or the tail end air valves to enable the current operation number of the electric butterfly valves and the tail end air valves to be equal to the number of the currently operated direct expansion units.

Further optionally, the controlling the current operation number of the electric butterfly valves or the terminal air valves so that the current operation number of the electric butterfly valves and the terminal air valves is equal to the number of the currently operated direct expansion units includes:

if the current operation number of the electric butterfly valves or the tail end air valves is larger than the number of the currently operated direct expansion units, closing the currently operated electric butterfly valves or the tail end air valves until the current operation number of the electric butterfly valves or the tail end air valves is equal to the number of the currently operated direct expansion units;

if the current operation number of the electric butterfly valves or the tail end air valves is smaller than the number of the currently operated direct expansion units, the electric butterfly valves or the tail end air valves which are not operated are opened until the current operation number of the electric butterfly valves or the tail end air valves is equal to the number of the currently operated direct expansion units.

acquiring the opening number of the currently operating electric butterfly valve and the opening number of the currently operating cooling tower butterfly valve according to the equipment operation parameters of the direct expansion type air conditioning unit system;

judging whether the opening number of the currently-operated electric butterfly valve is consistent with the opening number of the currently-operated cooling tower butterfly valve, if so, keeping the opening number of the currently-operated electric butterfly valve and the opening number of the currently-operated cooling tower butterfly valve, and judging whether the opening and closing state of a tail end air valve operated in a direct expansion type air conditioning unit system is the same as the opening and closing state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system; if the opening numbers of the two end air valves are not consistent with each other, issuing a command of opening the electric butterfly valve corresponding to the opening number of the currently-operated cooling tower butterfly valve or closing the electric butterfly valve not corresponding to the opening number of the currently-operated cooling tower butterfly valve, and judging whether the opening and closing states of the end air valve operated in the direct expansion type air conditioning unit system are the same as the opening and closing states of the end air valve before the last shutdown of the direct expansion type air conditioning unit system after issuing the command for the first time period.

Further optionally, before determining whether the on-off state of the terminal air valve operating in the direct expansion type air conditioning unit system is the same as the on-off state of the terminal air valve before the last shutdown of the direct expansion type air conditioning unit system, the method further includes:

and acquiring the on-off state of the currently operated tail end air valve and the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system according to the equipment operation parameters of the direct expansion type air conditioning unit system.

Further optionally, the determining whether the on-off state of the terminal air valve operating in the direct expansion type air conditioning unit system is the same as the on-off state of the terminal air valve before the last shutdown of the direct expansion type air conditioning unit system includes:

judging whether the on-off state of the currently running tail end air valve is the same as the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and if so, keeping the on-off state of the currently running tail end air valve; and if the current running state of the tail end air valve is different from the current running state of the tail end air valve, adjusting the switching state of the tail end air valve to enable the switching state of the tail end air valve to be the same as the switching state of the tail end air valve before the last shutdown of the direct-expansion air conditioning unit system, and setting the frequency of the fan of the cooling tower as the starting frequency set value of the fan of the cooling tower.

acquiring the in-place opening number of electric butterfly valves at the cooling side, the in-place opening number of electric water valves of the direct expansion unit, the in-place opening number of air valves, the operation number of cooling water pumps, the preset opening requirement number of the direct expansion unit and the number of the currently operated direct expansion unit according to the equipment operation parameters of the direct expansion type air conditioning unit system;

respectively judging whether the in-place opening quantity of the electric butterfly valve at the cooling side, the in-place opening quantity of the electric water valve of the direct expansion unit, the in-place opening quantity of the air valve and the running quantity of the cooling water pump are equal to the preset opening demand quantity of the direct expansion unit, if the in-place opening quantity of the electric butterfly valve at the cooling side, the in-place opening quantity of the electric water valve of the direct expansion unit, the in-place opening quantity of the air valve and the running quantity of the cooling water pump are equal to the preset opening demand quantity of the direct expansion unit, delaying for a second time period, and judging whether the preset opening demand quantity of the direct expansion unit is equal to the quantity of the currently running direct expansion unit; if the opening-in-place number of the electric butterfly valves at the cooling side, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves or the operation number of the cooling water pumps is not equal to the preset opening requirement number of the direct expansion unit, controlling the opening-in-place number of the electric butterfly valves at the cooling side, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves or the operation number of the cooling water pumps so that the opening-in-place number of the electric butterfly valves at the cooling side, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves and the operation number of the cooling water pumps are equal to the preset opening requirement number of the direct expansion unit, and after delaying for a second time period, judging.

Further optionally, the determining whether the preset starting demand quantity of the direct expansion unit is equal to the quantity of the currently running direct expansion unit includes:

judging whether the number of the currently operated direct expansion units is equal to the preset starting requirement number of the direct expansion units, if so, automatically operating the direct expansion type air conditioning unit system; if not, the currently operated direct expansion unit is closed or the non-operated direct expansion unit is opened so that the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units, and the direct expansion type air conditioning unit system automatically operates.

Further optionally, the closing the currently operating direct expansion unit or opening the non-operating direct expansion unit to make the number of the currently operating direct expansion unit equal to the preset opening requirement number of the direct expansion unit includes:

if the number of the currently operated direct expansion units is smaller than the preset opening requirement number of the direct expansion units, opening the direct expansion units which are not operated until the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units;

and if the number of the currently operated direct expansion units is larger than the preset opening requirement number of the direct expansion units, closing the currently operated direct expansion units until the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units.

According to a second aspect of an embodiment of the present application, there is provided a control device of a direct-expansion air conditioning unit system, the device including:

the acquisition unit is used for acquiring the equipment operation parameters of the direct expansion type air conditioning unit system;

and the adjusting unit is used for adjusting the operation number of the equipment in the direct-expansion type air conditioning unit system according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate.

According to a third aspect of embodiments of the present application, there is provided an air conditioner including: the control device of the direct expansion type air conditioning unit system according to the above technical solution.

By adopting the technical scheme, the invention can achieve the following beneficial effects: the operation parameters of the direct-expansion type air conditioning unit system are collected, the operation number of the equipment in the direct-expansion type air conditioning unit system is adjusted according to the operation parameters of the direct-expansion type air conditioning unit system, so that the direct-expansion type air conditioning unit system automatically operates, the automatic operation of the direct-expansion type air conditioning unit system can be realized under the condition of no stop, the working efficiency of the direct-expansion type air conditioning unit system is improved, and the operability of the direct-expansion type air conditioning unit system is also improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart illustrating a method of controlling a direct-expansion air conditioning unit system according to an exemplary embodiment;

FIG. 2 is a flow chart illustrating another method of controlling a direct-expansion air conditioning unit system in accordance with an exemplary embodiment;

fig. 3 is a schematic diagram illustrating another control apparatus of a direct-expansion air conditioning unit system according to an exemplary embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Fig. 1 is a flowchart illustrating a control method of a direct-expansion air conditioning unit system according to an exemplary embodiment, which may be used in, but not limited to, a terminal, as shown in fig. 1, including the steps of:

step 101: collecting equipment operation parameters of a direct expansion type air conditioning unit system;

step 102: and adjusting the operation number of the equipment in the direct-expansion type air conditioning unit system according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate.

In some embodiments, the automatic operation of the direct expansion type air conditioning unit system is the automatic mode of starting the direct expansion type air conditioning unit system.

Further, before step 102, the method further includes:

In some alternative embodiments, the user is prompted to detect the associated device in the direct-expansion air conditioning unit system when an abnormal condition exists in the direct-expansion air conditioning unit system. The user is helped to know the abnormity of the direct-expansion air conditioning unit system in time, and the irreparable damage of the related equipment in the direct-expansion air conditioning unit system caused by the untimely knowledge of the user is avoided.

Further, the abnormal condition of the direct-expansion air conditioning unit system may include, but is not limited to:

In some optional embodiments, the local state of the water pump is that the start-stop control can be performed only through the field control cabinet; the local state of the direct expansion unit is that the start and stop control can be carried out only through a touch screen of the direct expansion unit; the local state of the electric butterfly valve is that the start and stop control can be carried out only through the field control cabinet.

It should be noted that, in the embodiment of the present invention, the first time threshold and the second time threshold are not limited, and may be set by a person skilled in the art according to engineering requirements or experimental data. In some alternative embodiments, the first time threshold is 1 minute and the second time threshold is 10 seconds.

In some alternative embodiments, step 102 may be implemented by, but is not limited to, the following processes:

step 1021: acquiring the number of the currently running direct expansion unit and the number of the direct expansion unit activated in the automatic mode according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 1022: judging whether the number of the currently running direct expansion unit is consistent with the number of the direct expansion unit activated by the automatic mode, if not, closing the direct expansion unit inconsistent with the number of the direct expansion unit activated by the automatic mode and/or opening the direct expansion unit corresponding to the number of the direct expansion unit activated by the automatic mode; and if the operation number of the direct expansion unit is consistent with the operation number of the direct expansion unit, keeping the operation number of the direct expansion unit currently operated.

For example, if the number of the currently running direct expansion unit is No. 1 and the number of the direct expansion unit activated in the automatic mode is No. 2, the direct expansion unit No. 1 needs to be closed and the direct expansion unit No. 2 needs to be opened; assuming that the number of the currently running direct expansion unit is 1 or 2, and the number of the direct expansion unit activated in the automatic mode is 2, the direct expansion unit 1 needs to be closed.

In some alternative embodiments, step 102 may also be implemented by, but is not limited to, the following processes:

step 1023: acquiring the current operation number of water pumps, the current operation number of cooling towers and the number of the currently operated direct expansion units according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 1024: respectively judging whether the current operation number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, and if the current operation number of the water pumps is equal to the number of the currently operated direct expansion units and the current operation number of the cooling towers is equal to the number of the currently operated direct expansion units, keeping the current operation number of the water pumps and the current operation number of the cooling towers; and if the operation number of the water pumps is not equal to the number of the currently operated direct expansion units or the operation number of the cooling tower is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the water pumps or the cooling tower so as to enable the current operation number of the water pumps and the cooling tower to be equal to the number of the currently operated direct expansion units.

In some embodiments, the water pumps in the direct expansion type air conditioning unit system comprise a cooling water pump and a chilled water pump, and the number of the cooling water pump and the chilled water pump is equal to the number of the currently operated direct expansion units; for example, if the water pumps in the direct expansion type air conditioning unit system include a cooling water pump and a chilled water pump, and the number of the currently operated direct expansion unit is 2, the number of the cooling water pumps required to be operated is 2, and the number of the chilled water pumps is 2.

Further optionally, in step 1024, controlling the current operation number of the water pumps or the cooling towers so that the current operation number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, including:

For example, if the number of the currently operating direct expansion unit is 2, the number of the water pumps is 1, and the number of the cooling towers is 3, it is necessary to turn on 1 water pump that is not in operation, and turn off 1 cooling tower that is in operation.

step 1025: acquiring the current operation number of electric butterfly valves, the current operation number of tail end air valves and the number of the currently operated direct expansion units according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 1026: respectively judging whether the current operation number of the electric butterfly valves and the tail end air valves is equal to the number of the currently operated direct expansion units, and if the current operation number of the electric butterfly valves is equal to the number of the currently operated direct expansion units and the current operation number of the tail end air valves is equal to the number of the currently operated direct expansion units, keeping the current operation number of the electric butterfly valves and the tail end air valves; if the current operation number of the electric butterfly valves is not equal to the number of the currently operated direct expansion units or the current operation number of the tail end air valves is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the electric butterfly valves or the tail end air valves to enable the current operation number of the electric butterfly valves and the tail end air valves to be equal to the number of the currently operated direct expansion units.

Further optionally, in step 1026, controlling the current operation number of the electric butterfly valves or the terminal air valves so that the current operation number of the electric butterfly valves and the terminal air valves is equal to the number of the currently operated direct expansion units, including:

For example, if the number of currently operating direct expansion units is 3, the number of operations of electric butterfly valves in the direct expansion air conditioning unit system is 4, and the number of operations of end air valves is 2, it is necessary to close 1 operating electric butterfly valve and open one non-operating end air valve.

step 1027: acquiring the opening number of the currently operating electric butterfly valve and the opening number of the currently operating cooling tower butterfly valve according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 1028: judging whether the opening number of the currently operating electric butterfly valve is consistent with the opening number of the currently operating cooling tower butterfly valve, if so, keeping the opening number of the currently operating electric butterfly valve and the opening number of the currently operating cooling tower butterfly valve, and executing step 1029; if the command is inconsistent with the command, issuing a command for opening the electric butterfly valve corresponding to the opening number of the currently operating cooling tower butterfly valve or closing the electric butterfly valve not corresponding to the opening number of the currently operating cooling tower butterfly valve, and executing step 1029 after issuing the command for a first time period;

for example, assuming that the electric butterfly valve operated in the direct expansion type air conditioning unit system is the No. 1 electric butterfly valve and the cooling tower butterfly valve operated in the direct expansion type air conditioning unit system is the No. 2 cooling tower butterfly valve, it is necessary to close the No. 1 electric butterfly valve and close the No. 1 electric butterfly valve in place, open the No. 2 electric butterfly valve and open the No. 2 electric butterfly valve in place.

It should be noted that, in the embodiment of the present invention, the first time period is not limited, and may be set by a person skilled in the art according to engineering requirements or experimental data; in some alternative embodiments, the first time period is 1 second.

Step 1029: acquiring the on-off state of a currently running tail end air valve and the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 10210: judging whether the on-off state of the currently running tail end air valve is the same as the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and if so, keeping the on-off state of the currently running tail end air valve; if not, adjusting the on-off state of the currently operated tail end air valve to enable the on-off state of the currently operated tail end air valve to be the same as the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and setting the frequency of the fan of the cooling tower as the starting frequency set value of the fan of the cooling tower.

For example, if the terminal air valve is opened and put in place before the last shutdown of the direct-expansion air conditioning unit system, and the currently operating terminal air valve is closed in the opening and closing state, the currently operating terminal air valve needs to be opened and put in place; assuming that the terminal damper is closed and closed in place before the last shutdown of the direct expansion air conditioning unit system, the currently operating terminal damper needs to be closed and closed in place if the switch state of the currently operating terminal damper is open.

In some optional embodiments, the on-off state of the end air valve before the direct expansion type air conditioning unit system is shut down last time can be checked from the current mode of the direct expansion type air conditioning unit system; for example, assuming that the terminal air valve is opened and in place before the last shutdown of the direct-expansion air conditioning unit system, the terminal air valve should also be opened and in place in the current mode; assuming that the end damper is closed and closed in place before the last shutdown of the direct-expansion air conditioning unit system, the end damper should also be closed and closed in place in the current mode.

step 10211: acquiring the in-place opening number of electric butterfly valves at the cooling side, the in-place opening number of electric water valves of the direct expansion unit, the in-place opening number of air valves, the operation number of cooling water pumps, the preset opening requirement number of the direct expansion unit and the number of the currently operated direct expansion unit according to the equipment operation parameters of the direct expansion type air conditioning unit system;

step 10212: respectively judging whether the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the operation number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, if the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the operation number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, delaying for a second time period, and executing step 10213; if the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves or the operation number of the cooling water pumps is not equal to the preset opening requirement number of the direct expansion unit, controlling the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves or the operation number of the cooling water pumps so that the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves and the operation number of the cooling water pumps are equal to the preset opening requirement;

it should be noted that in the direct expansion type air conditioning unit system, the number of the electric butterfly valves at the cooling side, the number of the electric water valves at the direct expansion unit, the number of the air valves at the direct expansion unit and the operation number of the cooling water pumps are the same, so that the number of the opening requirements of the direct expansion unit only needs to be equal to the number of one of the four devices;

it should be noted that, in the embodiment of the present invention, the second time period is not limited, and may be set by a person skilled in the art according to engineering requirements or experimental data; in some optional embodiments, the second time period is 1 second;

step 10213: judging whether the number of the currently operated direct expansion units is equal to the preset starting requirement number of the direct expansion units, if so, automatically operating the direct expansion type air conditioning unit system; if not, the currently operated direct expansion unit is closed or the non-operated direct expansion unit is opened so that the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units, and the direct expansion type air conditioning unit system automatically operates.

Further optionally, the closing the currently operating direct expansion unit or opening the non-operating direct expansion unit in step 10213 to make the number of the currently operating direct expansion unit equal to the preset opening requirement number of the direct expansion unit includes:

if the number of the currently operated direct expansion units is smaller than the preset opening requirement number of the direct expansion units, starting the direct expansion units which are not operated until the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units;

For example, if the number of the currently operated direct expansion units is 2 and the number of the opening requirements of the direct expansion units is 3, 1 direct expansion unit which is not operated needs to be opened; assuming that the number of the currently operated direct expansion units is 3 and the number of the opening requirements of the direct expansion units is 2, 1 currently operated direct expansion unit needs to be closed.

It can be understood that, the control method of the direct-expansion air conditioning unit system provided by the above embodiment can not only realize the automatic operation of the direct-expansion air conditioning unit system, but also realize the switching of the working mode of the direct-expansion air conditioning unit system from the automatic mode to the manual mode.

Further optionally, the control method further includes:

obtaining and judging whether the currently running equipment in the direct-expansion air conditioning unit system meets a set of direct-expansion air conditioning unit according to the equipment running parameters of the direct-expansion air conditioning unit system, and if so, switching the working mode of the direct-expansion air conditioning unit system from an automatic mode to a manual mode; if not, the direct expansion type air conditioning unit system is closed.

It can be understood that if the currently operating equipment in the direct-expansion air conditioning unit system does not have a complete set of direct-expansion air conditioning units, the direct-expansion air conditioning units are not normally operated.

In some optional embodiments, when the currently operating equipment in the direct expansion type air conditioning unit system does not satisfy a set of direct expansion type air conditioning unit, the direct expansion type air conditioning unit system is automatically switched to a closed mode, and meanwhile, a monitoring interface of the direct expansion type air conditioning unit system prompts a user that the user needs to overhaul.

In some embodiments, the user may switch the operation mode of the direct-expansion air conditioning unit system to the manual mode at any time. However, when the manual mode is switched, not only the timing function of the direct-expansion air conditioning unit system is turned off, but also the set point (i.e., the timing function) cannot be operated; and all equipment in the direct-expansion air conditioning unit system keep the state before switching, and a user can remotely monitor the equipment on the interface.

The control method of the direct-expansion type air conditioning unit system provided by the embodiment of the invention has the advantages that the equipment operation parameters of the direct-expansion type air conditioning unit system are collected, the operation number of the equipment in the direct-expansion type air conditioning unit system is adjusted according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate, the automatic operation of the direct-expansion type air conditioning unit system can be realized under the condition of no stop, the working efficiency of the direct-expansion type air conditioning unit system is improved, and the operability of the direct-expansion type air conditioning unit system is also improved.

As an improvement of the above embodiment, the embodiment of the present invention provides another control method of a direct-expansion air conditioning unit system, as shown in fig. 2, which may be but is not limited to be used in a terminal, including the following steps:

step 201: judging whether the direct expansion type air conditioning unit system has an abnormal condition, if so, executing the step 202; if the direct expansion type air conditioning unit system has no abnormal condition, executing step 203;

step 202: the direct expansion type air conditioning unit system cannot automatically operate;

step 203: collecting equipment operation parameters of a direct expansion type air conditioning unit system;

step 204: and adjusting the operation quantity of the equipment in the direct-expansion type air conditioning unit system according to the equipment operation parameters of the direct-expansion type air conditioning unit system so as to enable the direct-expansion type air conditioning unit system to automatically operate.

Further, the abnormal condition of the direct expansion air conditioning unit system in step 201 may include, but is not limited to:

In some alternative embodiments, step 204 may be implemented by, but is not limited to, the following processes:

step 2041: acquiring the number of a currently operated direct expansion unit, the number of an automatic mode activated direct expansion unit, the current operation number of a water pump, the current operation number of a cooling tower, the number of the currently operated direct expansion unit, the current operation number of an electric butterfly valve, the current operation number of a terminal air valve, the opening number of the currently operated electric butterfly valve, the opening number of the currently operated cooling tower butterfly valve, the opening state of the currently operated terminal air valve, the opening state of the terminal air valve before the last shutdown of the direct expansion air conditioning unit system, the opening-in-place number of a cooling side electric butterfly valve, the opening-in-place number of electric water valves of the direct expansion unit, the opening-in-place number of the air valves, the operation number of the cooling water pumps and the preset opening demand number of the direct expansion unit according to the equipment operation parameters of the direct expansion air conditioning unit system;

step 2042: judging whether the number of the currently running direct expansion unit is consistent with the number of the automatic mode activated direct expansion unit, if not, closing the direct expansion unit inconsistent with the number of the automatic mode activated direct expansion unit and/or opening the direct expansion unit corresponding to the number of the automatic mode activated direct expansion unit, and executing the step 2043; if yes, go to step 2043;

step 2043: respectively judging whether the current operation number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, and if the current operation number of the water pumps is equal to the number of the currently operated direct expansion units and the current operation number of the cooling towers is equal to the number of the currently operated direct expansion units, executing a step 2043; if the number of the water pumps is not equal to the number of the currently operated direct expansion units or the number of the cooling towers is not equal to the number of the currently operated direct expansion units, controlling the current number of the water pumps or the cooling towers so that the current number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, and executing a step 2044;

step 2044: respectively judging whether the current operation number of the electric butterfly valves and the tail end air valves is equal to the number of the currently operated direct expansion units, if so, executing a step 2045; if the current operation number of the electric butterfly valves is not equal to the number of the currently operated direct expansion units or the current operation number of the tail end air valves is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the electric butterfly valves or the tail end air valves to enable the current operation number of the electric butterfly valves and the tail end air valves to be equal to the number of the currently operated direct expansion units, and executing a step 2045;

step 2045: judging whether the opening number of the currently operating electric butterfly valve is consistent with the opening number of the currently operating cooling tower butterfly valve, if so, executing a step 2046; if not, issuing a command for opening the electric butterfly valve corresponding to the opening number of the currently-operating cooling tower butterfly valve or closing the electric butterfly valve not corresponding to the opening number of the currently-operating cooling tower butterfly valve, and executing step 2046 after issuing the command for a first time period;

it should be noted that, in the embodiment of the present invention, the first time period is not limited, and may be set by a person skilled in the art according to engineering requirements or experimental data; in some alternative embodiments, the first time period is 1 second;

step 2046: judging whether the opening and closing state of the currently running tail end air valve is the same as the opening and closing state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and if so, executing a step 2047; if not, adjusting the on-off state of the currently operating tail end air valve to enable the on-off state of the currently operating tail end air valve to be the same as the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, setting the frequency of the cooling tower fan as a set value of the starting frequency of the cooling tower fan, and executing step 2047;

step 2047: respectively judging whether the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the operation number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, if the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the operation number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, delaying for a second time period, and executing a step 2048; if the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves or the operation number of the cooling water pumps is not equal to the preset opening requirement number of the direct expansion unit, controlling the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves or the operation number of the cooling water pumps so that the opening-to-position number of the electric butterfly valves at the cooling side, the opening-to-position number of the electric water valves of the direct expansion unit, the opening-to-position number of the air valves and the operation number of the cooling water pumps are equal to the preset opening requirement;

step 2048: judging whether the number of the currently operated direct expansion units is equal to the preset starting requirement number of the direct expansion units, if so, automatically operating the direct expansion type air conditioning unit system; if not, the currently operated direct expansion unit is closed or the non-operated direct expansion unit is opened so that the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units, and the direct expansion type air conditioning unit system automatically operates.

Further optionally, the control method further includes:

Further optionally, in step 2043, controlling the current operation number of the water pumps or the cooling towers to make the current operation number of the water pumps and the cooling towers equal to the number of the currently operated direct expansion units, including

Further optionally, in step 2044, controlling the current operation number of the electric butterfly valves or the terminal air valves so that the current operation number of the electric butterfly valves and the terminal air valves is equal to the number of the currently operated direct expansion units, including:

Further optionally, in step 2048, the currently operating direct expansion unit is closed or the non-operating direct expansion unit is opened so that the number of the currently operating direct expansion units is equal to the preset opening requirement number of the direct expansion units, and the method includes:

The other control method of the direct-expansion air conditioning unit system provided by the embodiment of the invention is characterized in that whether the direct-expansion air conditioning unit system has abnormal conditions or not is judged, the equipment operation parameters of the direct-expansion air conditioning unit system are collected when the abnormal conditions do not exist, the operation number of the equipment in the direct-expansion air conditioning unit system is adjusted according to the equipment operation parameters of the direct-expansion air conditioning unit system so as to enable the direct-expansion air conditioning unit system to automatically operate, the automatic operation of the direct-expansion air conditioning unit system can be realized under the condition of no shutdown, the working efficiency of the direct-expansion air conditioning unit system is improved, and the operability of the direct-expansion air conditioning unit system is also improved.

In order to implement the control method of the direct expansion type air conditioning unit system, an embodiment of the present invention provides a control device of a direct expansion type air conditioning unit system, and referring to fig. 3, the control device includes:

the judging unit is used for judging whether the direct expansion type air conditioning unit system has an abnormal condition or not, and if the direct expansion type air conditioning unit system has the abnormal condition, the direct expansion type air conditioning unit system cannot automatically operate; if the direct expansion type air conditioning unit system has no abnormal condition, the adjusting unit is executed.

Further optionally, the abnormal condition of the direct-expansion air conditioning unit system may include, but is not limited to:

Further optionally, the adjusting unit comprises:

the first acquisition module is used for acquiring the number of the currently running direct expansion unit and the number of the direct expansion unit activated in the automatic mode according to the equipment operation parameters of the direct expansion type air conditioning unit system;

the first judgment module is used for judging whether the number of the currently running direct expansion unit is consistent with the number of the automatic mode activated direct expansion unit, if not, the direct expansion unit with the number inconsistent with the number of the automatic mode activated direct expansion unit is closed and/or the direct expansion unit corresponding to the number of the automatic mode activated direct expansion unit is opened; and if the operation number of the direct expansion unit is consistent with the operation number of the direct expansion unit, keeping the operation number of the direct expansion unit currently operated.

Further optionally, the adjusting unit further includes:

the second acquisition module is used for acquiring the current operation number of the water pumps, the current operation number of the cooling tower and the number of the currently operated direct expansion units according to the equipment operation parameters of the direct expansion type air conditioning unit system;

the second judgment module is used for respectively judging whether the current operation number of the water pumps and the cooling towers is equal to the number of the currently operated direct expansion units, and if the current operation number of the water pumps is equal to the number of the currently operated direct expansion units and the current operation number of the cooling towers is equal to the number of the currently operated direct expansion units, keeping the current operation number of the water pumps and the current operation number of the cooling towers; and if the operation number of the water pumps is not equal to the number of the currently operated direct expansion units or the operation number of the cooling tower is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the water pumps or the cooling tower so as to enable the current operation number of the water pumps and the cooling tower to be equal to the number of the currently operated direct expansion units.

Specifically, optionally, the second determining module controls the current operation number of the water pumps or the cooling towers so that the current operation number of the water pumps and the cooling towers is equal to the number of the currently-operated direct expansion units, and the method includes:

Further optionally, the adjusting unit further includes:

the third acquisition module is used for acquiring the current operation number of the electric butterfly valves, the current operation number of the tail end air valves and the number of the currently operated direct expansion unit according to the equipment operation parameters of the direct expansion type air conditioning unit system;

the third judging module is used for respectively judging whether the current running number of the electric butterfly valves and the tail end air valves is equal to the number of the currently running direct expansion units, and if the current running number of the electric butterfly valves is equal to the number of the currently running direct expansion units and the current running number of the tail end air valves is equal to the number of the currently running direct expansion units, keeping the current running number of the electric butterfly valves and the tail end air valves; if the current operation number of the electric butterfly valves is not equal to the number of the currently operated direct expansion units or the current operation number of the tail end air valves is not equal to the number of the currently operated direct expansion units, controlling the current operation number of the electric butterfly valves or the tail end air valves to enable the current operation number of the electric butterfly valves and the tail end air valves to be equal to the number of the currently operated direct expansion units.

It is specific optional, the third judges the current operation quantity of module control electric butterfly valve or terminal blast gate so that the current operation quantity of electric butterfly valve and terminal blast gate equals with the quantity of the unit of directly expanding of current operation, include:

Further optionally, the adjusting unit further includes: the device comprises a fourth acquisition module, a fourth judgment module, a fifth acquisition module and a fifth judgment module;

the fourth acquisition module is used for acquiring the opening number of the currently operating electric butterfly valve and the opening number of the currently operating cooling tower butterfly valve according to the equipment operation parameters of the direct expansion type air conditioning unit system;

the fourth judging module is used for judging whether the opening number of the currently operating electric butterfly valve is consistent with the opening number of the currently operating cooling tower butterfly valve, if so, keeping the opening number of the currently operating electric butterfly valve and the opening number of the currently operating cooling tower butterfly valve, and executing the fifth acquiring module; if the command is inconsistent with the command, issuing a command for opening the electric butterfly valve corresponding to the opening number of the currently-operated cooling tower butterfly valve or closing the electric butterfly valve not corresponding to the opening number of the currently-operated cooling tower butterfly valve, and executing a fifth acquisition module after issuing the command for a first time period;

the fifth acquisition module is used for acquiring the on-off state of the tail end air valve in the current operation and the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system according to the equipment operation parameters of the direct expansion type air conditioning unit system;

the fifth judging module is used for judging whether the switching state of the currently running tail end air valve is the same as the switching state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and if so, keeping the switching state of the currently running tail end air valve; if not, adjusting the on-off state of the currently operated tail end air valve to enable the on-off state of the currently operated tail end air valve to be the same as the on-off state of the tail end air valve before the last shutdown of the direct expansion type air conditioning unit system, and setting the frequency of the fan of the cooling tower as the starting frequency set value of the fan of the cooling tower.

Further optionally, the adjusting unit further includes: the sixth acquisition module, the sixth judgment module and the seventh judgment module;

a sixth obtaining module, configured to obtain, according to the device operation parameters of the direct expansion type air conditioning unit system, the number of electric butterfly valves in place to be opened on the cooling side, the number of electric water valves in place to be opened on the direct expansion unit, the number of air valves in place to be opened, the number of cooling water pumps in operation, the number of preset opening requirements of the direct expansion unit, and the number of the currently operating direct expansion unit;

the sixth judging module is used for respectively judging whether the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the running number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, and if the in-place opening number of the electric butterfly valves at the cooling side, the in-place opening number of the electric water valves of the direct expansion unit, the in-place opening number of the air valves and the running number of the cooling water pumps are equal to the preset opening demand number of the direct expansion unit, the seventh judging module is executed after a second time period is delayed; if the opening-in-place number of the cooling side electric butterfly valves, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves or the operation number of the cooling water pumps is not equal to the preset opening requirement number of the direct expansion unit, controlling the opening-in-place number of the cooling side electric butterfly valves, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves or the operation number of the cooling water pumps so that the opening-in-place number of the cooling side electric butterfly valves, the opening-in-place number of the electric water valves of the direct expansion unit, the opening-in-place number of the air valves and the operation number of the cooling water pumps are equal to the preset opening requirement number of the direct expansion unit;

the seventh judging module is used for judging whether the number of the currently operated direct expansion units is equal to the preset starting requirement number of the direct expansion units, and if so, the direct expansion type air conditioning unit system automatically operates; if not, the currently operated direct expansion unit is closed or the non-operated direct expansion unit is opened so that the number of the currently operated direct expansion units is equal to the preset opening requirement number of the direct expansion units, and the direct expansion type air conditioning unit system automatically operates.

Specifically, optionally, the seventh determining module closes the currently running direct expansion unit or opens the non-running direct expansion unit so that the number of the currently running direct expansion units is equal to the preset opening requirement number of the direct expansion unit, and the method includes:

The control device of the direct-expansion air conditioning unit system provided by the embodiment of the invention collects the equipment operation parameters of the direct-expansion air conditioning unit system through the collection unit, and the adjustment unit adjusts the operation number of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameters of the direct-expansion air conditioning unit system so as to enable the direct-expansion air conditioning unit system to automatically operate, so that the direct-expansion air conditioning unit system can automatically operate without stopping the machine, the working efficiency of the direct-expansion air conditioning unit system is improved, and the operability of the direct-expansion air conditioning unit system is also improved.

It is to be understood that the apparatus embodiments provided above correspond to the method embodiments described above, and corresponding specific contents may be referred to each other, which are not described herein again.

An embodiment of the present invention further provides an air conditioner, including: the control device of the direct expansion type air conditioning unit system in the above embodiment.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method of controlling a direct-expansion air conditioning unit system, the method comprising:

2. The control method according to claim 1, before adjusting the number of devices in the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system according to the device operation parameters of the direct-expansion air conditioning unit system, further comprising:

3. The control method according to claim 2, wherein the abnormal condition of the direct-expansion air conditioning unit system includes:

4. The control method according to claim 1, wherein the adjusting the number of operations of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameter of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system comprises:

5. The control method according to claim 1, wherein the adjusting the number of operations of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameter of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system further comprises:

6. The control method according to claim 5, wherein the controlling the current operation numbers of the water pumps or the cooling towers so that the current operation numbers of the water pumps and the cooling towers are equal to the number of the currently operated direct expansion units comprises:

7. The control method according to claim 1, wherein the adjusting the number of operations of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameter of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system further comprises:

8. The control method according to claim 7, wherein the controlling the current operation number of the electric butterfly valves or the end blast valves to make the current operation number of the electric butterfly valves and the end blast valves equal to the number of the currently operated direct expansion units comprises:

9. The control method according to claim 1, wherein the adjusting the number of operations of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameter of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system further comprises:

10. The control method according to claim 9, wherein before the determining whether the on-off state of the terminal damper operating in the direct-expansion air conditioning unit system is the same as the on-off state of the terminal damper before the last shutdown of the direct-expansion air conditioning unit system, the method further comprises:

11. The control method according to claim 10, wherein the determining whether the on-off state of the terminal damper operating in the direct-expansion air conditioning unit system and the on-off state of the terminal damper before the last shutdown of the direct-expansion air conditioning unit system are the same includes:

12. The control method according to claim 1, wherein the adjusting the number of operations of the equipment in the direct-expansion air conditioning unit system according to the equipment operation parameter of the direct-expansion air conditioning unit system to automatically operate the direct-expansion air conditioning unit system further comprises:

13. The control method according to claim 12, wherein the judging whether the preset starting requirement number of the direct expansion unit is equal to the number of the currently operated direct expansion unit comprises:

14. The control method according to claim 13, wherein the closing of the currently-operating direct expansion unit or the opening of the non-operating direct expansion unit to make the number of the currently-operating direct expansion units equal to the preset opening requirement number of the direct expansion units comprises:

15. A control device for a direct-expansion air conditioning unit system, characterized by comprising:

16. An air conditioner, characterized by comprising: the control device of a direct-expansion air conditioning unit system as claimed in claim 15.