Air conditioner outdoor unit and control method of air conditioner

Abstract

The invention relates to the technical field of air conditioner control, and provides an air conditioner outdoor unit and an air conditioner control method. The air conditioner outdoor unit comprises a shell, a condenser, a condensation fan, a fan variable-frequency driver, a machine liquid pipe temperature sensor and an outdoor environment temperature sensor. The condenser is arranged in the shell; the condensation fan is arranged on the outer side of the shell and is opposite to the condenser; the fan variable-frequency driver is arranged on the outer side of the shell and drives the condensate fan to operate; the machine liquid pipe temperature sensor is connected with the condenser and is in communication connection with the fan variable frequency driver; and the outdoor environment temperature sensor is arranged on the outer side of the shell and is in signal connection with the fan variable-frequency driver. The air conditioner outdoor unit can be in communication connection with the air conditioner indoor unit through the fan variable-frequency driver, so that the rotating speed of the condensation fan is adjusted, and the air conditioner system is controlled; and the influence of the damage of the fan variable frequency driver on the overall operation of the air conditioning system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning control, and in particular to an air conditioning outdoor unit and an air conditioning control method. Background Art

[0002] Data centers generally use computer room air conditioners for cooling and heat dissipation. As the requirements for data center computer room grades become more stringent, the long-term stability and reliability design of computer room air conditioner heat dissipation becomes increasingly important.

[0003] At present, the compressor of computer room air conditioning products in the data center field generally adopts a built-in design, that is, it is installed in the indoor unit. The main function of the outdoor unit is to exchange the heat absorbed by the indoor side with the outdoor ambient air through the condenser to realize the refrigeration cycle.

[0004] The heat dissipation control of the outdoor unit of the computer room air conditioner commonly used in the industry usually adopts the method of installing an AC axial flow fan plus a high-pressure pressure sensor plus a fan frequency conversion driver on the outdoor unit to achieve speed regulation control; the high-pressure pressure sensor is installed in the liquid pipe outlet pipe section of the outdoor unit to detect the high-pressure pressure value of the outdoor unit liquid pipe. The high-pressure pressure sensor is connected to the fan frequency conversion driver and has no communication connection with the indoor unit. That is, the information between the indoor and outdoor units cannot interact, the information is isolated, the outdoor unit forms an information island, and the equipment operation status cannot be monitored, which has obvious disadvantages.

[0005] When the high-pressure pressure sensor of the air-conditioning outdoor unit fails or the frequency converter fails, the condensing fan of the outdoor unit will not be able to perform adjustment and will stop running. The air-conditioning system will not be able to operate in a cooling manner, affecting the temperature control of the data center computer room. In addition, since there is no communication line connecting the indoor and outdoor units, the relevant status parameters of the outdoor unit cannot be read at the indoor control end, such as high-pressure pressure, outdoor fan speed, outdoor fan operating frequency / operating current, frequency converter alarm status, whether the outdoor fan is faulty, etc. This is equivalent to assuming that the outdoor fan fails or the frequency converter alarms, and the indoor control end cannot obtain the status information. The air-conditioning system will wait until the high-pressure alarm is triggered before the indoor control end can obtain the high-pressure alarm information, and then check the causes of the fault one by one, which is time-consuming and laborious.

[0006] Therefore, the existing computer room air conditioner outdoor unit has structural defects, and the air conditioning system will be unable to cool after the high-pressure pressure sensor and the fan frequency conversion driver are damaged. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an air-conditioning outdoor unit and an air-conditioning control method, aiming to solve the problem that the machine room air-conditioning outdoor unit has structural defects in the prior art, and the air-conditioning system cannot be cooled when the high-pressure pressure sensor and the fan frequency conversion driver are damaged.

[0008] The technical solution adopted by the present application to solve the technical problem is as follows: The present application provides an air-conditioning outdoor unit, including a shell, a condenser, a condensing fan, a fan frequency conversion driver, a machine-liquid pipe temperature sensor and an outdoor ambient temperature sensor; the condenser is arranged inside the shell; the condensing fan is arranged outside the shell, and the condensing fan is arranged opposite to the condenser; the fan frequency conversion driver is arranged outside the shell to drive the condensing fan to operate; the machine-liquid pipe temperature sensor is connected to the condenser, and the machine-liquid pipe temperature sensor is communicatively connected to the fan frequency conversion driver; the outdoor ambient temperature sensor is arranged outside the shell, and the outdoor ambient temperature sensor is signal-connected to the fan frequency conversion driver.

[0009] Optionally, the air conditioner outdoor unit also includes a liquid pipe interface and a gas side pipe interface; the liquid pipe interface is arranged on the condenser, and the liquid pipe interface is connected to the condenser tube of the condenser; the gas side pipe interface is arranged on the condenser, and the gas side pipe interface is connected to the condenser tube of the condenser.

[0010] Optionally, the air conditioner outdoor unit further includes an outdoor unit electrical control box, which is disposed on the outside of the shell; the fan frequency conversion driver is electrically connected to the outdoor unit electrical control box; and an air switch is disposed on the outdoor unit electrical control box.

[0011] The present application also provides a method for controlling an air conditioner, wherein an air conditioner indoor unit is communicatively connected to an air conditioner outdoor unit, wherein the air conditioner outdoor unit is the air conditioner outdoor unit described above;

[0012] The high pressure value signal detected by the air conditioner indoor unit is transmitted to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed;

[0013] The air conditioner indoor unit is connected to the air conditioner outdoor unit via a variable frequency mode contactor or via an industrial frequency mode contactor.

[0014] Optionally, when the communication between the air-conditioning indoor unit and the air-conditioning outdoor unit is disconnected, the machine liquid pipe temperature sensor transmits the received temperature value to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed.

[0015] Optionally, when the communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner is disconnected and the machine liquid pipe temperature sensor fails, the outdoor ambient temperature sensor transmits the temperature value to the fan frequency converter, and after signal conversion, the condensing fan outputs the corresponding fan speed;

[0016] The temperature value interval of the outdoor environment temperature sensor includes a low temperature interval, a medium temperature interval and a high temperature interval;

[0017] The fan frequency conversion driver is provided with a low temperature fault speed value, a medium temperature fault speed value and a high temperature fault speed value; the low temperature fault speed value corresponds to the low temperature interval, the medium temperature fault speed value corresponds to the medium temperature interval, and the high temperature fault speed value corresponds to the high temperature interval.

[0018] Optionally, the high temperature range is greater than or equal to the first set temperature T g , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is 100%R o , R o is the maximum full speed of the condensing fan;

[0019] The low temperature range is less than or equal to the second set temperature T c , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is (T W /

[0020] (T g +T c ))%R o ;

[0021] The medium temperature range is T c To T g When the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is (T W / T g )%R o .

[0022] Optionally, when the fan variable frequency drive fails, the air conditioner indoor unit switches from operating in a contact variable frequency mode contactor to operating in a contact power frequency mode contactor;

[0023] When the high pressure value P detected by the air conditioner indoor unit is higher than the first set value, the condensing fan is turned on at full speed R in the power frequency mode. max run;

[0024] When the high pressure value P detected by the air conditioner indoor unit is lower than the second set value, the condensing fan is disconnected and stops running;

[0025] The second setting value is smaller than the first setting value.

[0026] Optionally, the first limit value is the starting pressure P of the condensing fan. q With deviation pressure P s sum;

[0027] The second limit value is (Pq -0.2×P s ).

[0028] Optionally, when the high pressure value P detected by the air conditioner indoor unit is at (P q -0.2×P s ) to P q When the condensing fan speed is within the range of 25%R max ;

[0029] When the high pressure value P detected by the air conditioner indoor unit is at P q to (P q +P s ) range; the fan speed of the condensing fan is (25% + 50% (PP q ) / P s )R max .

[0030] Compared with the prior art, the air-conditioning outdoor unit provided in the present application can communicate and connect with the air-conditioning indoor unit through the fan frequency conversion driver, so as to adjust the speed of the condensing fan, and then adjust the working state of the condenser, realize the control of the air-conditioning system, and make the overall parameters and state of the air-conditioning system visualized and monitorable; when the air-conditioning indoor unit and the air-conditioning outdoor unit cannot be communicated and connected, the speed of the condensing fan can be adjusted by the machine-liquid pipe temperature sensor, so that the condenser can work normally; the air-conditioning outdoor unit does not contain a high-pressure pressure sensor. When the fan frequency conversion driver is damaged or fails, the speed of the condensing fan can be adjusted by the outdoor ambient temperature sensor, so that the condenser can work normally, realize the normal operation of the air-conditioning system, and reduce the impact of damage to some components on the overall operation of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of an outdoor unit of an air conditioner provided in this application;

[0032] Figure 2 It is a connection diagram of an air conditioner outdoor unit and an air conditioner indoor unit in the air conditioner control method provided in this application;

[0033] Figure 3 It is a schematic diagram of adjusting the fan speed of the condensing fan by the temperature value of the machine-liquid pipe temperature sensor in the air-conditioning control method provided in the present application.

[0034] Description of reference numerals:

[0035] 1. Condensing fan; 2. Outdoor unit electric control box; 21. Rotating hinge; 22. Electric control box cover; 23. Circuit breaker; 24. Waterproof interface; 3. Fan frequency converter; 4. Gas side pipe interface; 5. Liquid pipe interface; 6. Condenser; 7. Outdoor ambient temperature sensor; 8. Machine liquid pipe temperature sensor; 9. Bracket; 10. Shell; 11. Air conditioner indoor unit; 12. High pressure sensor; 13. Frequency conversion mode contactor; 14. Power frequency mode contactor. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0040] Additionally, in the following description, specific details are provided to provide a thorough understanding of the embodiments. However, one skilled in the art will appreciate that the aspects described may be practiced without these specific details.

[0041] Combined with reference Figure 1 The first embodiment of the present application provides an air-conditioning outdoor unit, including a shell 10, a condenser, a condensing fan 1, a fan frequency conversion driver 3, a machine liquid pipe temperature sensor 8 and an outdoor environment temperature sensor 7; the condenser is arranged inside the shell 10; the condensing fan 1 is arranged on the outside of the shell 10, opposite to the condenser; the fan frequency conversion driver 3 is arranged on the outside of the shell 10 to drive the condensing fan 1 to operate; the machine liquid pipe temperature sensor 8 is connected to the condenser, and is signal-connected to the fan frequency conversion driver 3; the outdoor environment temperature sensor 7 is arranged on the outside of the shell 10, and communicates signals with the fan frequency conversion driver 3.

[0042] Among them, the wind direction of the condensing fan 1 is toward the condenser, so that the working state of the condenser can be adjusted by adjusting the speed of the condensing fan 1, and then the working state of the air conditioner outdoor unit can be adjusted; the machine liquid pipe temperature sensor 8 can be set at the outlet of the condensing pipe 6 of the condenser to detect the temperature state of the high-temperature and high-pressure liquid passing through the condensing pipe 6, so as to judge the working state of the condenser; the outdoor environment temperature sensor 7 is used to detect the outdoor temperature; the housing 10 is used to protect the internal components of the air conditioner outdoor unit from damage; the fan variable frequency driver 3 can monitor and display the state of the condensing fan 1, and can also drive the condensing fan 1 to move and adjust the working mode of the condensing fan 1. The main communication connection methods include wired transmission, short-distance line transmission, traditional Internet transmission, mobile air network transmission, etc.

[0043] An air-conditioning outdoor unit of the present embodiment can be communicated and connected with the air-conditioning indoor unit 11 through the fan frequency conversion driver 3, so as to adjust the speed of the condensing fan 1, and then adjust the working state of the condenser, realize the control of the air-conditioning system, and make the overall parameters and state of the air-conditioning system visualized and monitorable; when the air-conditioning indoor unit 11 and the air-conditioning outdoor unit cannot be communicated and connected, the speed of the condensing fan 1 can be adjusted through the machine-liquid pipe temperature sensor 8, so that the condenser can work normally; the outdoor unit does not contain a high-pressure pressure sensor 12. When the fan frequency conversion driver 3 is damaged or fails, the speed of the condensing fan 1 can be adjusted through the outdoor ambient temperature sensor 7, so that the condenser can work normally, realize the normal operation of the air-conditioning system, and reduce the impact of damage to some components on the overall operation of the air-conditioning system.

[0044] In some embodiments, the air conditioner outdoor unit further includes a liquid pipe interface 5 and a gas side pipe interface 4; the liquid pipe interface 5 is arranged on the condenser and connected to the condenser tube 6 of the condenser; the gas side pipe interface 4 is arranged on the condenser and connected to the condenser tube 6 of the condenser. The condenser includes the condenser tube 6 and the main tube, the liquid pipe interface 5 and the gas side pipe interface 4 are both arranged on the main tube of the condenser, the liquid pipe interface 5 and the gas side pipe interface 4 are respectively located at the two ends of the main tube, the liquid pipe interface 5 is used to pass the liquid, and the gas side pipe interface 4 is used to supply the gas. Specifically, the gas is introduced through the gas side pipe interface 4, and after the gas enters the main tube, it is condensed into liquid through the condenser tube 6, and then the liquid is passed out through the other end of the main tube through the liquid pipe interface 5.

[0045] In some embodiments, the air conditioner outdoor unit further includes an outdoor unit electric control box 2, which is disposed outside the housing 10; the fan variable frequency driver 3 is electrically connected to the outdoor unit electric control box 2; and a circuit breaker 23 is disposed on the outdoor unit electric control box 2. The outdoor unit electric control box 2 is used to control the opening and closing of the air conditioner outdoor unit and monitor the working state of the air conditioner outdoor unit, and the circuit breaker 23 is used to disconnect the circuit in an emergency, thereby cutting off the operation of the air conditioner outdoor unit.

[0046] The outdoor unit electric control box 2 also includes an electric control box shell cover 22, which is used to open and close the outdoor unit electric control box 2, and to prevent the internal components of the outdoor unit electric control box 2 from being damaged, and to prevent dust, magazines, etc. from entering the outdoor unit electric control box 2 to affect the normal operation of the internal components of the outdoor unit electric control box 2. The electric control box shell cover 22 is arranged on one side of the outdoor unit electric control box 2, and is connected to the outdoor unit electric control box 2 through a rotating hinge 21. Specifically, the electric control box shell cover 22 rotates around the rotating hinge 21 to open and close the outdoor unit electric control box 2. At the same time, the outdoor unit electric control box 2 is also provided with a waterproof interface 24, which can be connected to an external power supply through the waterproof interface 24.

[0047] In some embodiments, the air-conditioning outdoor unit further includes a bracket 9, which is connected to the housing 10, and the bracket 9 mainly plays a supporting and connecting role; the air-conditioning outdoor unit can be set outdoors through the bracket 9, which is convenient for fixing and assembly.

[0048] Combined with reference Figure 2 The second embodiment of the present application provides a method for controlling an air conditioner, which communicatively connects an air conditioner indoor unit 11 with an air conditioner outdoor unit, and the air conditioner outdoor unit is the air conditioner outdoor unit of the first embodiment and its implementation method.

[0049] The high pressure value signal detected by the air conditioner indoor unit 11 is transmitted to the fan frequency conversion driver 3, and after signal conversion, the condensing fan 1 outputs the corresponding fan speed;

[0050] The air conditioner indoor unit is connected to the air conditioner outdoor unit through the variable frequency mode contactor 13 or through the power frequency mode contactor 14. That is, the air conditioner indoor unit 11 can be connected to the fan variable frequency driver 3 through the variable frequency mode contactor 13, and then connected to the condensing fan 1, that is, the mode of the air conditioner system is the variable frequency mode at this time; the air conditioner indoor unit 11 can also be connected to the condensing fan 1 through the power frequency mode contactor 14, that is, the mode of the air conditioner system is the power frequency mode at this time. Therefore, under normal conditions, if the air conditioner indoor unit 11 and the air conditioner outdoor unit can operate normally, the air conditioner indoor unit 11 is connected to the air conditioner outdoor unit by contacting the variable frequency mode contactor 13, and the working mode adopts the variable frequency mode.

[0051] The air conditioner indoor unit 11 is provided with a high pressure sensor 12, an evaporator and an indoor control terminal; specifically, the high pressure sensor 12 is installed on the air conditioner indoor unit liquid pipe, and is used to detect the high pressure value of the air conditioner indoor unit liquid pipe. More specifically, the high pressure sensor 12 is installed on the indoor unit liquid pipe, and is located at the entrance of the evaporator; the indoor control terminal is used to control and monitor the opening and closing and working state of the air conditioner indoor unit 11. At the same time, the indoor control terminal is also connected to the air conditioner outdoor unit for communication, and is connected to the working parameters of the air conditioner outdoor unit, such as the speed, operating state, machine liquid pipe temperature, outdoor ambient temperature, and operating current of the condensing fan 1 of the condensing fan 1. Specifically, in the air conditioner indoor unit 11, the liquid passes into the evaporator through the indoor unit liquid pipe, and passes out after being converted into gas after absorbing heat.

[0052] In the control method of the air conditioner in this embodiment, the air conditioner indoor unit 11 can be connected to the air conditioner outdoor unit through the indoor control terminal for communication, so as to realize data interaction between the indoor and outdoor units. The fan frequency conversion driver 3 of the air conditioner outdoor unit can also transmit the status parameters such as the rotation speed, operating status, machine liquid pipe temperature, outdoor ambient temperature, and operating current of the condensing fan 1 to the indoor control terminal in real time, so as to realize the parameter visualization of the air conditioner indoor unit 11 and the air conditioner outdoor unit at the indoor control terminal, and the air conditioner indoor unit 11 and the air conditioner outdoor unit will not form a data island; the air conditioner indoor unit 11 and the air conditioner outdoor unit's fan frequency conversion driver 3 can be regulated by the indoor control terminal, so as to control the air conditioning system.

[0053] The air conditioner control method of this embodiment can be controlled in the following ways.

[0054] The first method: by means of communication connection between the indoor unit of the air conditioner and the outdoor unit of the air conditioner, the high pressure value detected by the indoor unit of the air conditioner in real time is converted into a voltage signal, which is transmitted to the fan variable frequency driver of the indoor unit of the air conditioner; the fan variable frequency driver receives the corresponding voltage signal value and outputs the corresponding fan speed. Therefore, by connecting the indoor unit of the air conditioner with the fan variable frequency driver, the variable frequency driver drives the condensing fan to achieve adjustable and controllable speeds.

[0055] During the adjustment process of the condensing fan of the air conditioner indoor unit, the high pressure value may rise or fall; preferably, the starting pressure of the condensing fan and the deviation pressure can be combined for comprehensive adjustment. Specifically, the corresponding relationship between the voltage signal converted from the high pressure value and the corresponding fan speed in the fan variable frequency drive can be set according to actual needs, so as to achieve a better condensing fan adjustment effect.

[0056] Specifically, comprehensive control is performed by combining the starting pressure of the condensing fan with the deviation pressure as follows.

[0057] When the high pressure value P detected by the air conditioner indoor unit is higher than the first set value, the condensing fan is turned on at full speed R in variable frequency mode. max 'Operation; when the high pressure value P detected by the air conditioner indoor unit is lower than the second set value, the power frequency mode contactor of the air conditioner indoor unit is disconnected, the condensing fan is disconnected, and stops running; the second set value is less than the first set value.

[0058] Among them, the first limit value is the starting pressure P of the condensing fan q With deviation pressure P s The second limiting value is (P q -0.2×P s ).

[0059] Specifically, when the high pressure value P detected by the air conditioner indoor unit is (P q -0.2×P s ) to P q When the condensing fan speed is within the range of 25% R max '; When the high pressure value P detected by the air conditioner indoor unit is at P q to (P q +P s ) range; the fan speed of the condensing fan is (25% + 50% (PP q ) / P s )R max '.

[0060] At the same time, several high-pressure value data are continuously read at the indoor control end to monitor the pressure value trend. Specifically, 5 high-pressure value data are continuously read at the indoor control end, and the difference between them is calculated, A / B / C / D / E, and (BA), (CB), (DC), (ED) are calculated. According to the possible situations of the above 4 groups of difference data, the corresponding trend control strategy is distinguished:

[0061] I) When the above four difference data are all positive values, it means that the high pressure of the air conditioner indoor unit is still on an upward trend. At this time, the condensing fan increases its speed according to the corresponding speed adjustment logic;

[0062] II) When the above four difference data are all negative values, it means that the high pressure of the air conditioner indoor unit is on a downward trend. At this time, the condensing fan executes the speed reduction according to the corresponding speed adjustment logic;

[0063] III) When the above four difference data have a positive or negative transition, the condensing fan speed is adjusted after two cycles; for example, when the above four difference data are all negative, it means that the high pressure of the air conditioner indoor unit is already on a downward trend. If the four difference data become positive at this time, the condensing fan is suddenly on an upward trend. The current speed output of the condensing fan is kept unchanged. If the condensing tube temperature is on a downward trend after two cycles, the condensing fan speed is reduced; if the condensing tube temperature is still on an upward trend after two cycles, the condensing fan speed is increased;

[0064] IV) When the above 4 difference data are positive, negative or zero, the condensing fan maintains the current speed without adjustment and runs steadily.

[0065] By using the above-mentioned comprehensive control combining the starting pressure of the condensing fan with the deviation pressure, the fan speed of the condensing fan can be adjusted in real time, so that the air-conditioning system is in the best state, with long-term stability and high reliability, and is suitable for use in computer rooms with high temperature requirements.

[0066] The second type: when the communication between the air-conditioning indoor unit and the air-conditioning outdoor unit is disconnected, the machine liquid pipe temperature sensor transmits the received temperature value to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed.

[0067] When the communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner is disconnected, the connection line of the variable frequency mode contactor of the indoor unit of the air conditioner is blocked, and the indoor unit of the air conditioner cannot directly adjust the operating status of the outdoor unit of the air conditioner. The machine liquid pipe temperature sensor and the outdoor ambient temperature sensor are directly set on the outdoor unit of the air conditioner and connected to the fan variable frequency driver signal. Therefore, the signal on the receiving machine liquid pipe temperature sensor or the outdoor ambient temperature sensor can be converted to adjust the fan speed of the condensing fan. At the same time, since the machine liquid pipe temperature sensor can directly detect the outlet of the condensing pipe, the temperature value measured by the machine liquid pipe temperature sensor is used to adjust the condensing fan, which has a better effect on adjusting the operating status of the condensing pipe and the outdoor unit of the air conditioner.

[0068] That is, when the air-conditioning indoor unit cannot directly regulate the air-conditioning outdoor unit, the air-conditioning outdoor unit directly regulates the fan frequency converter according to the detection value of the machine liquid pipe temperature sensor, thereby outputting an appropriate fan speed.

[0069] Combined with Figure 3The specific adjustment strategy for adjusting the fan speed of the condensing fan by the temperature value of the machine-liquid pipe temperature sensor is as follows:

[0070] T set -Outdoor fan temperature setting; ΔT-Outdoor fan temperature cut-off hysteresis; T h - External fan temperature speed adjustment differential; F max -External fan speed upper limit; F min -Lower limit of external fan speed; F q -Corresponding fan speed (i.e. condensing fan speed); T q -The temperature value of the machine liquid pipe temperature sensor (in short, liquid pipe temperature); R o - Maximum full speed of the condensing fan.

[0071] a) if T q <(T set -ΔT), then F q =0%;

[0072] b)if(T set -ΔT) <T q <T set (T↗), then F q =0%;

[0073] c) if T q ≈T set (T↗), then F q =0%;

[0074] d) if T q ≈T set (T↘), then F q =F min ;

[0075] e)if(T set -ΔT) <T q <T set (T↘), then F q =F min ;

[0076] f)if T set <T q <(T set +T h ), then F q =((T q -T set )(F max -F min ) / T h )+F min ;

[0077] g)if T q ≥(T set +T h ), then F q =F max .

[0078] There is also a trend control strategy in this process, that is, the machine liquid pipe temperature sensor continuously reads several temperature value data located on the condenser to monitor the temperature value trend. Specifically, the machine liquid pipe temperature sensor continuously reads 5 temperature value data located on the condenser, and calculates the difference between the two, a / b / c / d / e, and calculates (ba), (cb), (dc), (ed). According to the possible situations of the above 4 groups of difference data, the corresponding trend control strategy is distinguished:

[0079] I) When the above four difference data are all positive values, it means that the condenser temperature is still on an upward trend. At this time, the condenser fan increases its speed according to the corresponding speed adjustment logic;

[0080] II) When the above four difference data are all negative values, it means that the condenser temperature is on a downward trend. At this time, the condenser fan will reduce the speed according to the corresponding speed adjustment logic;

[0081] III) When the above 4 difference data have a positive or negative transition, the condensing fan speed is adjusted after 2 cycles; for example, when the above 4 difference data are all negative, it means that the condensing tube temperature is already in a downward trend. If the 4 difference data become positive at this time, the condensing fan is suddenly in an upward trend. The current speed output of the condensing fan is kept unchanged. If the condensing tube temperature is in a downward trend after 2 cycles, the condensing fan speed is reduced; if the condensing tube temperature is still in an upward trend after 2 cycles, the condensing fan speed is increased;

[0082] IV) When the above 4 difference data are positive, negative or zero, the condensing fan maintains the current speed without adjustment and runs steadily.

[0083] Among them, T↗ means that the condenser temperature is in an upward trend, and T↘ means that the condenser temperature is in a downward trend. set , ΔT, T h It can be set according to actual conditions. Preferably, T set The default setting is 35℃, ΔT is 3℃, T h The default setting is 10°C. max and F min It can be set according to actual conditions; preferably, F max =100%R o , F min =40%Ro .

[0084] Through this trend control strategy, the speed of the condensing fan can be adjusted in time, so that the air-conditioning system is in the best condition, with long-term stability and strong reliability, and is suitable for use in computer rooms with high temperature requirements. At the same time, it can also provide sufficient buffer time for operation and maintenance personnel to go to the site for maintenance, effectively improving the refrigeration sustainability and availability of the air-conditioning system.

[0085] The third type: when the communication between the air conditioner indoor unit and the air conditioner outdoor unit is disconnected and the machine liquid pipe temperature sensor fails, the outdoor ambient temperature sensor transmits the temperature value to the fan frequency converter, and after signal conversion, the condensing fan outputs the corresponding fan speed.

[0086] When the communication between the air-conditioning indoor unit and the air-conditioning outdoor unit is disconnected and the machine liquid pipe temperature sensor fails, the connection line of the frequency conversion mode contactor of the air-conditioning indoor unit is blocked, and the air-conditioning indoor unit cannot directly adjust the operating status of the air-conditioning outdoor unit; at the same time, the machine liquid pipe temperature sensor fails and cannot directly detect the status of the condensing pipe; and the outdoor ambient temperature sensor is directly arranged on the air-conditioning outdoor unit and connected to the fan frequency conversion driver signal. Therefore, the signal on the outdoor ambient temperature sensor can be received for signal conversion, and then the fan speed of the condensing fan can be adjusted.

[0087] The temperature value interval of the outdoor environment temperature sensor includes a low temperature interval, a medium temperature interval and a high temperature interval.

[0088] The fan frequency conversion driver is provided with a low temperature fault speed value, a medium temperature fault speed value and a high temperature fault speed value; the low temperature fault speed value corresponds to the low temperature interval, the medium temperature fault speed value corresponds to the medium temperature interval, and the high temperature fault speed value corresponds to the high temperature interval.

[0089] Specifically, the high temperature range is greater than or equal to the first set temperature T g , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is 100%R o , R o It is the maximum full speed of the condensing fan.

[0090] The low temperature range is less than or equal to the second set temperature T c , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is (T W /

[0091] (T g +T c ))%Ro .

[0092] The medium temperature range is T c To T g When the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is (T W / T g )%R o .

[0093] T g It can be set to 10-20℃, preferably 15℃; T c It can be set to 0-10°C, preferably 3°C.

[0094] The fourth type: when the fan frequency conversion driver fails, the air-conditioning indoor unit switches from contacting the variable frequency mode contactor to contacting the industrial frequency mode contactor; the high-pressure pressure value detected by the high-pressure pressure sensor arranged on the liquid pipe of the air-conditioning indoor unit is converted into a signal to adjust the working mode of the air-conditioning indoor unit and the industrial frequency mode contactor, thereby adjusting the switch of the condensing fan of the air-conditioning outdoor unit and the fan speed.

[0095] Specifically, when the fan frequency conversion driver fails, the line connected to the frequency conversion mode contactor cannot be conducted, and the air conditioner indoor unit switches to the industrial frequency mode in contact with the industrial frequency mode contactor. The condensing fan can then be connected to the air conditioner indoor unit, and then the circuit is connected, so that it can operate.

[0096] After the air conditioner indoor unit switches to the power frequency mode in contact with the power frequency mode contactor, during the adjustment process of the condensing fan of the air conditioner indoor unit, some people may see the high pressure value rise or fall; preferably, it can be mainly combined with the starting pressure of the condensing fan and the deviation pressure for comprehensive regulation. The comprehensive regulation process is similar to the first case, except that: when the high pressure value P detected by the air conditioner indoor unit is higher than the first set value, the condensing fan is at full speed R in the power frequency mode. max run.

[0097] Specifically, when the high pressure value P detected by the air conditioner indoor unit is higher than the first set value, the condensing fan is driven at full speed R in the power frequency mode. max Operation; when the high pressure value P detected by the air-conditioning indoor unit is lower than the second set value, the power frequency mode contactor of the air-conditioning indoor unit is disconnected, the condensing fan is disconnected, and the operation stops; the second set value is less than the first set value.

[0098] Among them, the first limit value is the starting pressure P of the condensing fan q With deviation pressure P s The second limiting value is (P q-0.2×P s ).

[0099] Specifically, when the high pressure value P detected by the air conditioner indoor unit is (P q -0.2×P s ) to P q When the condensing fan speed is within the range of 25%R max When the high pressure value P detected by the air conditioner indoor unit is at P q to (P q +P s ) range; the fan speed of the condensing fan is (25% + 50% (PP q ) / P s )R max .

[0100] At the same time, the indoor control terminal continuously reads several high-pressure value data to monitor the pressure value trend. Specifically, the indoor control terminal continuously reads 5 high-pressure value data, calculates the difference between the two, and distinguishes the corresponding trend control strategy in the same way as in the first case.

[0101] The control method of the air conditioner of the present embodiment not only connects the air conditioner indoor unit with the air conditioner outdoor unit in communication, thereby realizing data interaction between the indoor and outdoor units, but also proposes a variety of air conditioner control methods through the connection mode between the air conditioner indoor unit and the air conditioner outdoor unit, including: when the communication between the air conditioner indoor unit and the air conditioner outdoor unit is disconnected, the machine liquid pipe temperature sensor transmits the received temperature value to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed; when the communication between the air conditioner indoor unit and the air conditioner outdoor unit is disconnected, and the machine liquid pipe temperature sensor fails, the outdoor environment temperature sensor transmits the temperature value to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed; when the fan frequency conversion driver fails, the air conditioner indoor unit switches from contacting the variable frequency mode contactor to contacting the power frequency mode contactor; the high pressure value detected by the high pressure pressure sensor arranged on the liquid pipe of the air conditioner indoor unit is converted by signal to adjust the working mode of the air conditioner indoor unit and the power frequency mode contactor, thereby adjusting the switch and fan speed of the condensing fan of the air conditioner outdoor unit.

[0102] That is, the air conditioning control method of this embodiment ensures the sustainable refrigeration operation of the air conditioning system through the cooperation of multiple components, provides sufficient buffer time for operation and maintenance personnel to go to the site for maintenance, and effectively improves the refrigeration sustainability and availability of the air conditioning system.

[0103] The present application provides an air-conditioning outdoor unit, which can be communicated and connected with the air-conditioning indoor unit through a fan frequency conversion driver, so as to adjust the speed of the condensing fan, and then adjust the working state of the condenser, realize the control of the air-conditioning system, and make the overall parameters and state of the air-conditioning system visualized and monitorable; when the air-conditioning indoor unit and the air-conditioning outdoor unit cannot be communicated and connected, the speed of the condensing fan can be adjusted by the machine-liquid pipe temperature sensor, so that the condenser can work normally; the air-conditioning outdoor unit does not contain a high-pressure pressure sensor, and when the fan frequency conversion driver is damaged or fails, the speed of the condensing fan can be adjusted by the outdoor ambient temperature sensor, so that the condenser can work normally, realize the normal operation of the air-conditioning system, and reduce the impact of damage to some components on the overall operation of the air-conditioning system.

[0104] The present application also provides a control method for an air conditioner, in which the above-mentioned air-conditioning outdoor unit and the air-conditioning indoor unit are connected through a variable frequency mode contactor or an industrial frequency mode contactor, and are communicatively connected. While realizing data interaction between the indoor and outdoor units, the cooperation of multiple components ensures the sustainable cooling operation of the air-conditioning system, provides sufficient buffer time for operation and maintenance personnel to go to the site for maintenance, and effectively improves the cooling sustainability and availability of the air-conditioning system.

[0105] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above examples, a person of ordinary skill in the art should understand that he or she can still modify the technical solutions described in the above examples, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the examples of the present application.

Claims

1. An air conditioner outdoor unit, characterized in that: It includes a shell, a condenser, a condensing fan, a fan frequency conversion driver, a machine-liquid pipe temperature sensor and an outdoor ambient temperature sensor; the condenser is arranged inside the shell; the condensing fan is arranged outside the shell, and the condensing fan and the condenser are arranged opposite to each other; the fan frequency conversion driver is arranged outside the shell to drive the condensing fan to operate; the machine-liquid pipe temperature sensor is connected to the condenser, and the machine-liquid pipe temperature sensor is communicatively connected to the fan frequency conversion driver; the outdoor ambient temperature sensor is arranged outside the shell, and the outdoor ambient temperature sensor is signal-connected to the fan frequency conversion driver.

2. The air conditioner outdoor unit according to claim 1, characterized in that: The air conditioner outdoor unit also includes a liquid pipe interface and a gas side pipe interface; the liquid pipe interface is arranged on the condenser, and the liquid pipe interface is connected to the condenser tube of the condenser; the gas side pipe interface is arranged on the condenser, and the gas side pipe interface is connected to the condenser tube of the condenser.

3. The air conditioner outdoor unit according to claim 1, characterized in that: The air conditioner outdoor unit also includes an outdoor unit electric control box, which is arranged on the outside of the shell; the fan variable frequency driver is electrically connected to the outdoor unit electric control box; and an air switch is arranged on the outdoor unit electric control box.

4. A method for controlling an air conditioner, characterized in that: Connecting the indoor air conditioner to the outdoor air conditioner, wherein the outdoor air conditioner is the outdoor air conditioner according to any one of claims 1 to 3; The high pressure value signal detected by the air conditioner indoor unit is transmitted to the fan frequency conversion driver, and after signal conversion, the condensing fan outputs the corresponding fan speed; The air conditioner indoor unit is connected to the air conditioner outdoor unit via a variable frequency mode contactor or via an industrial frequency mode contactor.

5. The air conditioner control method according to claim 4, characterized in that: When the communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner is disconnected, the machine liquid pipe temperature sensor transmits the received temperature value to the fan variable frequency driver, and after signal conversion, the condensing fan outputs the corresponding fan speed.

6. The air conditioner control method according to claim 4, characterized in that: When the communication between the indoor unit of the air conditioner and the outdoor unit of the air conditioner is disconnected and the machine liquid pipe temperature sensor fails, the outdoor environment temperature sensor transmits the temperature value to the fan frequency converter, and after signal conversion, the condensing fan outputs the corresponding fan speed; The temperature value interval of the outdoor environment temperature sensor includes a low temperature interval, a medium temperature interval and a high temperature interval; The fan frequency conversion driver is provided with a low temperature fault speed value, a medium temperature fault speed value and a high temperature fault speed value; the low temperature fault speed value corresponds to the low temperature interval, the medium temperature fault speed value corresponds to the medium temperature interval, and the high temperature fault speed value corresponds to the high temperature interval.

7. The air conditioner control method according to claim 6, characterized in that: The high temperature range is greater than or equal to the first set temperature T g , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is 100%R o , R o is the maximum full speed of the condensing fan; The low temperature range is less than or equal to the second set temperature T c , when the temperature value of the outdoor ambient temperature sensor is T W When in the low temperature range, the low temperature fault speed value is (T W / (T g +T c ))%R o ; The medium temperature range is T c To T g When the temperature value of the outdoor ambient temperature sensor is within the range of W When in the low temperature range, the low temperature fault speed value is (T W / T g )%R o .

8. The air conditioner control method according to claim 4, characterized in that: When the fan variable frequency drive fails, the air conditioner indoor unit switches from contacting the variable frequency mode contactor to contacting the industrial frequency mode contactor; When the high pressure value P detected by the air conditioner indoor unit is higher than the first set value, the condensing fan is turned on at full speed R in the power frequency mode. max run; When the high pressure value P detected by the air conditioner indoor unit is lower than the second set value, the condensing fan is disconnected and stops running; The second setting value is smaller than the first setting value.

9. The air conditioner control method according to claim 8, characterized in that: The first limit value is the starting pressure P of the condensing fan q With deviation pressure P s sum; The second limit value is (P q -0.2×P s ).

10. The air conditioner control method according to claim 9, characterized in that: When the high pressure value P detected by the air conditioner indoor unit is at (P q -0.2×P s ) to P q When the condensing fan speed is within the range of 25%R max ; When the high pressure value P detected by the air conditioner indoor unit is at P q to (P q +P s ) range; the fan speed of the condensing fan is (25% + 50% (PP q ) / P s )R max .

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