Air conditioner

Abstract

An air conditioner according to an embodiment of the present invention includes an outdoor unit, an expansion valve kit, at least one air handling unit, and a controller. The outdoor unit has a compressor, an outdoor heat exchanger, an outdoor blower, an outdoor expansion valve, and a control portion that controls the operation of the compressor. The expansion valve kit has an indoor expansion valve. The air handling unit has an indoor heat exchanger and an indoor blower. The controller operates the indoor expansion valve. The control portion or the controller adjusts the opening degree of the expansion valve and the change period of the opening degree or the operation frequency of the compressor and the change period of the operation frequency, respectively, in a case where a parameter value indicating a change in the temperature of air blown out from the indoor blower or a parameter value indicating a change in the temperature of air sucked in by the indoor blower is not within a range defined by a first threshold value and a second threshold value smaller than the first threshold value.

Description

Technical Field

[0001] Embodiments of the present invention relate to an air conditioner in which the air handling unit is connected to an outdoor unit via an expansion valve assembly. Background Technology

[0002] An air conditioner is known in which an air handling unit (ALU) is connected to an outdoor unit via an expansion valve assembly to form a refrigerant refrigeration cycle and to regulate the air quality of a specified space. The ALU comprises a blower (indoor fan), a heat exchanger, and various sensors as its main components, but does not include a refrigerant expansion device. The expansion valve assembly is an optional device used to control the air conditioning capacity of the ALU. It includes an expansion valve that is piped to the heat exchanger of the ALU and its operation is controlled by a designated control unit (interface controller). The control unit activates the expansion valve of the expansion valve assembly based on detection data such as the blower temperature of the indoor fan detected by the sensors of the ALU, thereby controlling the capacity of the ALU.

[0003] In the air conditioners in question, the air handling unit is sometimes manufactured by a third party, different from the expansion valve assembly and the outdoor unit. Even in such cases where equipment from different manufacturers is mixed together, it is essential to ensure the stable operation of the refrigeration cycle and the proper functioning of the air conditioner. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent No. 6479205 Summary of the Invention The technical problem that the invention aims to solve

[0005] The present invention is based on this, and its purpose is to provide an air conditioner that enables the refrigeration cycle formed by the connection of the air conditioning processing unit and the outdoor unit via the expansion valve assembly to operate stably. Technical means for solving technical problems

[0006] According to this embodiment, the air conditioner includes an outdoor unit, an expansion valve assembly, at least one air handling unit, and a controller. The outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor fan, an outdoor expansion valve, and a control unit that controls the operation of the compressor. The expansion valve assembly includes an indoor expansion valve. The air handling unit includes an indoor heat exchanger and an indoor fan. The controller actuates the indoor expansion valve. When a parameter value representing the temperature change of air blown from the indoor fan or a parameter value representing the temperature change of air drawn in by the indoor fan is not within a range defined by a first threshold and a second threshold smaller than the first threshold, the control unit or the controller adjusts the opening degree of the expansion valve and the cycle of the opening degree, or the operating frequency of the compressor and the cycle of the operating frequency, respectively. Attached Figure Description

[0007] Figure 1 This is a circuit diagram schematically illustrating the structure of the air conditioner according to Embodiment 1. Figure 2 This is a control flowchart for controlling the capacity of the air handling unit in the air conditioner involved in Embodiment 1 and Embodiment 2. Figure 3 This is a control flowchart for the capacity control of the air handling unit in the air conditioner involved in Embodiments 3 and 4. Figure 4 This is a circuit diagram schematically illustrating the structure of the air conditioner according to Embodiment 5. Figure 5 This is an example of a control flowchart for controlling the capacity of the air handling unit in the air conditioner according to Embodiment 5. Figure 6 This is another example of a control flowchart for controlling the capacity of the air handling unit in the air conditioner according to Embodiment 5. Detailed Implementation

[0008] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. (Implementation Method 1) Figure 1 This is a circuit diagram schematically illustrating the structure of the air conditioner 1 according to this embodiment. like Figure 1 As shown, the air conditioner 1 includes an outdoor unit 2, an air handling unit 3, an expansion valve assembly 4, and an interface controller (hereinafter referred to as the controller) 5. The outdoor unit 2 and the air handling unit 3 are connected via the expansion valve assembly 4 through a flow path 6 that circulates the refrigerant. The controller 5 is connected to the outdoor unit 2, the air handling unit 3, and the expansion valve assembly 4 via wired or wireless means, and performs data communication between these components for motion control.

[0009] As key components, outdoor unit 2 includes a compressor 2a, an oil separator 2b, a check valve 2c, a four-way valve 2d, a heat exchanger (hereinafter referred to as the outdoor heat exchanger) 2e, a blower (hereinafter referred to as the outdoor fan) 2f, an expansion valve (hereinafter referred to as the outdoor expansion valve) 2g, a liquid receiver 2h, and a suction cup 2i. All components except the outdoor fan 2f are sequentially piped together and disposed in the flow path 6 connected to the air handling unit 3 via the expansion valve assembly 4. The outdoor fan 2f is disposed adjacent to the outdoor heat exchanger 2e.

[0010] In addition, the outdoor unit 2 includes a capability calculation unit 2j and a setting unit 2k. The capability calculation unit 2j includes a CPU, memory, storage device (non-volatile memory), input / output circuits, timers, etc., and performs prescribed calculations. For example, the capability calculation unit 2j controls the operation of various elements of the outdoor unit 2, and cooperates with the controller 5 to control the operation of the air handling unit 3 and the expansion valve assembly 4. Specifically, the capability calculation unit 2j can directly control the operating frequency of the compressor 2a and the opening and closing of the indoor expansion valve 4a of the expansion valve assembly 4 (described later). In addition, when controlling the opening and closing of the indoor expansion valve 4a, the capability calculation unit 2j can assign the control execution command to the control unit 5a of the controller 5 (described later), and indirectly control the opening and closing of the indoor expansion valve 4a through the control unit 5a, thereby adjusting the opening degree of the indoor expansion valve 4a.

[0011] The setting unit 2k includes a first setting unit 21k and a second setting unit 22k. The first setting unit 21k sets whether the control of the opening and closing of the indoor expansion valve 4a (described later) is performed by the capacity calculation unit 2j or the control unit 5a; specifically, it sets the opening degree of the indoor expansion valve 4a and the cycle of its change. The second setting unit 22k sets whether to adjust the opening degree of the indoor expansion valve 4a and its change cycle, or to adjust the operating frequency of the compressor 2a and its change cycle. The setting units 21k and 22k are, for example, configured as an externally facing panel, switch, button, or display when the door of the housing 21 (not shown) is opened. Furthermore, the first setting unit 21k and the second setting unit 22k can be a single structure that combines the functions of each other, or they can be separate independent structures. Additionally, the setting unit 2k can be optionally installed alongside the setting unit 3d of the air handling unit 3 (described later); if the setting unit 3d exists, it can be omitted.

[0012] As key components, the air handling unit 3 includes a heat exchanger (hereinafter referred to as an indoor heat exchanger) 3a, a blower (hereinafter referred to as an indoor fan) 3b, a detection unit 3c, and a setting unit 3d. Additionally, Figure 1As an example, only one air handling unit 3 is shown, but there can be multiple air handling units 3. An indoor heat exchanger 3a is disposed on piping within a housing 31 that forms a flow path 6 connecting to the outdoor unit 2 via an expansion valve assembly 4. An indoor fan 3b is disposed adjacent to the indoor heat exchanger 3a within the housing 31. The housing 31 defines the external outline of the air handling unit 3. A detection unit 3c is an element within the air handling unit 3 that detects the temperature of objects such as a thermistor or other temperature sensor.

[0013] Figure 1 In the example shown, the detection unit 3c includes four detection units 31c, 32c, 33c, and 34c. The first detection unit 31c is configured close to the indoor fan 3b and detects the temperature of the air (hereinafter referred to as the outlet temperature) blown out from the indoor fan 3b after temperature regulation through heat exchange in the indoor heat exchanger 3a. The second detection unit 32c is configured in the flow path 6 on the liquid refrigerant side of the indoor heat exchanger 3a and detects the temperature of the liquid refrigerant flowing into or out of the indoor heat exchanger 3a (hereinafter referred to as the liquid refrigerant temperature). The third detection unit 33c is configured in the flow path 6 on the liquid refrigerant side of the indoor heat exchanger 3a and detects the temperature of the liquid refrigerant flowing into or out of the indoor heat exchanger 3a (hereinafter referred to as the liquid refrigerant temperature). The fourth detection unit 34c is configured in the flow path 6 between the second detection unit 32c and the third detection unit 33c and detects the temperature of the refrigerant between them (hereinafter referred to as the intermediate refrigerant temperature). Each detection unit 31c, 32c, 33c, and 34c assigns the detected temperature value to the control unit 5a of the controller 5, which will be described later.

[0014] The setting unit 3d includes a first setting unit 31d and a second setting unit 32d. The first setting unit 31d sets whether the opening and closing operation of the indoor expansion valve 4a of the expansion valve assembly 4 (described later) is controlled by the capacity calculation unit 2j or the control unit 5a of the controller 5 (described later). Specifically, it sets the opening degree of the indoor expansion valve 4a and the cycle of its opening degree change. The second setting unit 32d sets whether to adjust the opening degree of the indoor expansion valve 4a and the cycle of its opening degree change, or to adjust the operating frequency of the compressor 2a and the cycle of its operating frequency change. These setting units 31d and 32d are, for example, remote controls for the air handling unit 3, including operation panels, switches, buttons, and displays. Furthermore, the first setting unit 31d and the second setting unit 32d can be a single structure that combines the functions of each other, or they can be separate independent structures. In addition, the setting unit 3d can be optionally installed alongside the setting unit 2k of the outdoor unit 2; if the setting unit 2k is present, it can be omitted.

[0015] As a key component, the expansion valve assembly 4 includes an expansion valve (hereinafter referred to as the indoor expansion valve) 4a. As described above, the air handling unit 3 includes an indoor heat exchanger 3a and an indoor fan 3b, but does not have an expansion valve for controlling its air conditioning capacity. Therefore, the expansion valve assembly 4 is provided in the air conditioner 1 as an optional device for controlling the air conditioning capacity of the air handling unit 3 involved. The indoor expansion valve 4a is connected in piping between the outdoor unit 2 and the air handling unit 3 within the housing 41 and is disposed in the flow path 6 connecting these units 2 and 3. The housing 41 defines the external contour of the expansion valve assembly 4.

[0016] The controller 5 controls the operation of the outdoor unit 2, the air handling unit 3, and the expansion valve assembly 4. Furthermore, the controller 5 is configured to issue commands to the outdoor unit 2 for controlling the operation of the outdoor unit 2, the air handling unit 3, and the expansion valve assembly 4. The controller 5 includes a control unit 5a that performs the relevant controls. The control unit 5a includes a CPU, a memory, a storage device (non-volatile memory), input / output circuits, a timer, etc., and performs prescribed arithmetic processing. For example, the control unit 5a controls the operation of the detection unit 3c of the air handling unit 3 and analyzes the temperature values ​​obtained from the detection unit 3c. Based on the analysis results, the control unit 5a controls the opening and closing of the indoor expansion valve 4a, the operating frequency of the compressor 2a, etc. When controlling the opening and closing of the indoor expansion valve 4a, the control unit 5a can execute the control according to its own execution commands, or it can execute the control according to execution commands from the capability calculation unit 2j. Furthermore, when controlling the operating frequency of compressor 2a, control unit 5a assigns the control execution command to capacity calculation unit 2j of outdoor unit 2, controls the drive of compressor 2a via capacity calculation unit 2j, and adjusts the operating frequency.

[0017] Next, an example of the capacity control of the air handling unit 3 when the air conditioner 1 is in operation according to this embodiment will be described according to the control flow of the control unit 5a. Figure 2 The control flow of the control unit 5a when controlling the capacity of the air handling unit 3 is shown in the figure. like Figure 2 As shown, when the air conditioner 1 starts operating, the control unit 5a causes the detection unit 3c to start temperature detection and acquire the detection result (temperature value) (S101). Specifically, the control unit 5a causes each detection unit 31c, 32c, 33c, and 34c to operate and acquire the detection values ​​of the blow-out temperature, liquid refrigerant temperature, gaseous refrigerant temperature, and intermediate refrigerant temperature.

[0018] Next, the control unit 5a determines whether the air handling unit 3 meets the capability determination criteria. The capability determination criteria are whether the unit is in a state where its air conditioning capability can be properly determined, and are based on whether the air conditioner 1 has been continuously operating for a reference time since its start of operation. After the air conditioner 1 starts operating, its operating state may be unstable until the reference time has elapsed, potentially preventing proper sampling of the air conditioning capability of the air handling unit 3. Therefore, a reference time is preset as the continuous operating time of the air conditioner 1 required for proper determination of the air conditioning capability of the air handling unit 3. The reference time is stored, for example, in the storage device of the control unit 5a and is read into the memory when the capability determination criteria are met. The value of the reference time can be arbitrarily set according to the performance of the air conditioner 1, for example, approximately 10 minutes.

[0019] When determining whether the capability is acceptable, the control unit 5a compares the operating time (t) of the air conditioner 1 with a reference time (t0) and determines whether the operating time is above the reference time (t≥t0) (S102). The operating time is the elapsed time from the start of operation to the time when the capability is acceptable is determined. The control unit 5a repeats the determination of the capability is acceptable until the operating time becomes above the reference time (t≥t0).

[0020] When the operating time exceeds the reference time, the control unit 5a determines the capability determination conditions of the air handling unit 3. The capability determination conditions are used to determine the air conditioning capability of the air handling unit 3 during the operation of the air conditioner 1, and are determined based on capability determination condition parameters. The capability determination condition parameters are the temperature difference between the outlet temperature (TF) and the target outlet temperature (TFO) every specified time interval (t). n The change in ((TF-TFO) / t) n The value of the blown-out temperature (TF) is detected by the first detection unit 31c and assigned to the control unit 5a. The target blown-out temperature (TFO) is the target temperature of the air blown out after temperature adjustment in the air handling unit 3, which is ultimately equivalent to the set room temperature. The value of the target blown-out temperature (TFO) is set by the user, for example, via the setting unit 3d and stored in the memory of the control unit 5a. The temperature difference (TF-TFO) between the blown-out temperature and the target blown-out temperature is an absolute value. A specified time (t) is also considered. n The time interval for determining the capability of air handling unit 3 is preset, i.e., the determination interval (sampling time) for capability determination conditions. Sampling time (t) n For example, the data is stored in the storage device of the control unit 5a and read into the memory when the capability determination condition is determined. The sampling time involved can be arbitrarily set according to the capability of the air handling unit 3, for example, set to an initial value of about 1 minute to 10 minutes that does not exceed the reference time.

[0021] When determining the capability assessment conditions, two threshold values ​​are used. A first threshold (X) is preset as the upper limit value of the specified capability assessment condition parameters. A second threshold (Y) is preset as the lower limit value of the specified capability assessment condition parameters. The first and second threshold values ​​are stored, for example, in the storage device of the control unit 5a and are read into the memory when the capability assessment conditions are determined. These threshold values ​​can be arbitrarily set according to the air conditioning capability of the air handling unit 3, for example, the first threshold is about 10°C and the second threshold is about 3°C.

[0022] When determining the capability assessment conditions, the control unit 5a calculates the capability assessment condition parameter ((TF-TFO) / t). n The value of ) is calculated and compared with the first threshold (X). For example, the control unit 5a determines whether the value of the capability determination condition parameter exceeds the first threshold ((TF-TFO) / t). n >X)(S103).

[0023] If the value of the capability determination condition parameter exceeds the first threshold, the control unit 5a increases the opening change amount (ΔPLS) of the indoor expansion valve 4a and adjusts the opening of the indoor expansion valve 4a according to this opening change amount (S104). As a result, the opening of the indoor expansion valve 4a is larger than before the adjustment. The opening change amount of the indoor expansion valve 4a is a measure of the degree to which the indoor expansion valve 4a is open, and is a variable value that changes according to the value of the capability determination condition parameter. For example, the larger the value of the capability determination condition parameter, the larger the opening change amount becomes. The value of the opening change amount is tabulated and stored in the storage device of the control unit 5a in relation to the value of the capability determination condition parameter, and is read into the memory when the opening change amount is adjusted.

[0024] Next, control unit 5a adjusts the sampling time (t) n () shorten. For example, control unit 5a shortens the sampling time (t) when determining the current capability determination conditions. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Shorten the specified time (α)(t) n =t n-1 -α)(S105). Sampling time (t) n The time interval (α) until the next capability determination condition is met is equivalent to the change cycle of the opening degree of the indoor expansion valve 4a, and in this embodiment, it is equivalent to the change cycle of the opening degree change amount (ΔPLS). The specified time (α) is the sampling time (t). nThe adjustment time (α) can be set arbitrarily according to the air conditioning capacity of the air handling unit 3. For example, the adjustment time (α) involved is a value of about 10% of the sampling time. If the sampling time is about 1 minute to 10 minutes, the adjustment time (α) is about 0.1 minutes to 1 minute.

[0025] In contrast, the value of the capability determination condition parameter in S103 is below the first threshold ((TF-TFO) / t). n If the value of the capability determination condition parameter is less than or equal to X, the control unit 5a compares the value of the capability determination condition parameter with the second threshold (Y). For example, the control unit 5a determines whether the value of the capability determination condition parameter is less than the second threshold ((TF-TFO) / t). n <Y)(S106).

[0026] If the value of the capability determination condition parameter is less than the second threshold, the control unit 5a reduces the opening change amount (ΔPLS) of the indoor expansion valve 4a and adjusts the opening of the indoor expansion valve 4a according to this opening change amount (S107). As a result, the opening of the indoor expansion valve 4a is smaller than before the adjustment. For example, the smaller the value of the capability determination condition parameter, the smaller the change amount.

[0027] Next, control unit 5a adjusts the sampling time (t) n For example, control unit 5a extends the sampling time (t) during the current capability determination condition determination. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Extend the adjustment time (α)(t) n =t n-1 +α)(S108). Additionally, here, the adjustment time (α) is made equal to the sampling time (t). n The values ​​of (S105) are the same when the length is shortened, but they can also be different.

[0028] In contrast, the value of the capability determination condition parameter in S106 is above the second threshold ((TF-TFO) / t). n In the case of ≥Y), control unit 5a determines whether air conditioner 1 is present during the entire sampling time (t). n The air conditioner 1 continues to operate (S109). For example, the control unit 5a determines whether the operating time of the air conditioner 1 is longer than the sampling time (t≥t). n In this case, when determining the capability assessment condition, it is equivalent to the value of the capability assessment condition parameter being above the second threshold and below the first threshold. In this case, the opening change (ΔPLS) of the indoor expansion valve 4a is maintained without adjustment, and the sampling time remains at the value at the time of the last capability assessment.

[0029] Furthermore, if the sampling time (t) is made in S105... n Shorten, or in S108 reduce the sampling time (t) n If the extension is extended, the control unit 5a will make the same decision (S109).

[0030] When air conditioner 1 is in the entire sampling time (t) n While the air handling unit 1 continues to operate, the control unit 5a again determines the capability determination condition of the air handling unit 3 (S103). At this time, the control unit 5a resets the operating time (t) of the air conditioner 1 to zero (t=0) (S110). Then, based on the determination result of the capability determination condition, the control unit 5a appropriately repeats the subsequent processing (S104~S108).

[0031] In contrast, during the entire sampling time (t) from the air conditioner 1... n During the period of continuous operation of the air conditioner 1, the control unit 5a determines the operation stop condition of the air conditioner 1 (S111). The operation stop condition is the determination condition for whether to stop the operation of the air conditioner 1, for example, based on whether the control unit 5a receives a signal indicating that the air conditioner 1 has stopped operating. For example, the operation stop signal is issued from the setting unit 2k of the outdoor unit 2 and the setting unit 3d of the air handling unit 3 by the operator or user selecting to stop.

[0032] If the operation stop condition is not met, control unit 5a repeatedly checks whether air conditioner 1 continues to operate throughout the entire sampling time (t≥t). n The determination of (S109). On the other hand, when the operation stop condition is met, the control unit 5a stops the operation of the air conditioner 1 (S112). That is, during the operation of the air conditioner 1, a series of processes for controlling the capacity of the air handling unit 3 are repeatedly performed. When the air conditioner 1 stops operating, the series of processes for controlling the capacity of the air handling unit 3 also ends.

[0033] Therefore, according to this embodiment, in the capability determination condition parameter ((TF-TFO) / t) n When the value of ) exceeds the first threshold (X), the opening change of the indoor expansion valve 4a can be increased (ΔPLS), and the sampling time (t) can be reduced. nThe time interval for determining the capability is shortened when the value of the capability determination condition parameter exceeds the first threshold, which corresponds to a large temperature difference between the blow-out temperature (TF) and the target blow-out temperature (TFO). Therefore, by increasing the opening change of the indoor expansion valve 4a and shortening the sampling time, the determination interval for the capability determination condition, i.e., the change cycle of the opening change of the indoor expansion valve 4a, can be shortened. Thus, by adjusting the opening of the indoor expansion valve 4a in a shorter cycle, the blow-out temperature in the air handling unit 3 can reach the target blow-out temperature more quickly.

[0034] Furthermore, in the capability determination condition parameter ((TF-TFO) / t) n When the value of ) is less than the second threshold (Y), the opening change of the indoor expansion valve 4a can be reduced (ΔPLS), and the sampling time (t) can be reduced. n The value of the capability judgment condition parameter is less than the second threshold, which corresponds to a small temperature difference between the blow-out temperature (TF) and the target blow-out temperature (TFO) and a fluctuating state. Therefore, in this case, by reducing the opening change amount of the indoor expansion valve 4a and extending the sampling time, the change cycle of the opening change amount of the indoor expansion valve 4a can be extended. Therefore, the opening of the indoor expansion valve 4a can be adjusted over a longer period of time. In other words, compared with the case where the temperature difference between the blow-out temperature and the target blow-out temperature is large, the change cycle of the opening change amount of the indoor expansion valve 4a can be delayed, and the blow-out temperature can reach the target blow-out temperature more efficiently.

[0035] Furthermore, when the value of the capability determination condition parameter is above the second threshold and below the first threshold, the opening change of the indoor expansion valve 4a can be maintained without adjustment, and the sampling time can be maintained at the value of the last capability determination. When the value of the capability determination condition parameter is above the second threshold and below the first threshold, it corresponds to a relatively stable temperature difference between the blown-out temperature and the target blown-out temperature. Therefore, in this case, by maintaining the opening change of the indoor expansion valve 4a and the sampling time, the change cycle of the opening change of the indoor expansion valve 4a can also be kept constant. Therefore, by combining the cases where the temperature difference between the blown-out temperature and the target blown-out temperature is large and small, the blown-out temperature can be appropriately reached to achieve the target blown-out temperature.

[0036] The adjustment of the opening degree and the adjustment cycle of these indoor expansion valves 4a is performed by the control unit 5a, i.e., the controller 5. Therefore, for example, even if the air handling unit 3 is manufactured by a third party different from the outdoor unit 2, the expansion valve assembly 4, and the controller 5, the air conditioning capacity of the air handling unit 3 can be properly controlled. Therefore, the operation of the refrigeration cycle in the air conditioner 1, including the air handling unit 3 manufactured by the third party involved, can be stabilized.

[0037] Furthermore, the adjustment of the opening degree change and the change cycle of the opening degree change of the indoor expansion valve 4a can be performed by the outdoor unit 2, more specifically by the capacity calculation unit 2j, and not by the control unit 5a, i.e., the controller 5. Hereinafter, the implementation method in which the adjustment is performed by the capacity calculation unit 2j will be described as Embodiment 2. In addition, the structure of the air conditioner 1 in Embodiment 2 is the same as that in Embodiment 1 (…). Figure 1 The same applies. Therefore, the following description of the structure of the air conditioner involved is omitted (see [reference]). Figure 1 The following describes an example of capacity control for the air handling unit 3 in Embodiment 2. In this case, the control content in the control flow of the capacity calculation unit 2j is the same as... Figure 2 The control flow of Embodiment 1 shown has the same steps (S101 to S111), but the control entities are different. Therefore, in the description of Embodiment 2, refer to Figure 2 The control flow is shown.

[0038] (Implementation Method 2) In this embodiment, the capacity calculation unit 2j of the outdoor unit 2 is used as the main body to perform capacity control of the air handling unit 3, including the adjustment of the opening change amount and the change cycle of the opening change amount of the indoor expansion valve 4a.

[0039] When air conditioner 1 starts running, Figure 2 In step S101 shown, the capability calculation unit 2j obtains the temperature detection value (temperature value) detected by the detection unit 3c from the control unit 5a (S101). Specifically, the capability calculation unit 2j obtains the detection values ​​of the blow-out temperature, liquid refrigerant temperature, gaseous refrigerant temperature, and intermediate refrigerant temperature detected by each detection unit 31c, 32c, 33c, and 34c.

[0040] Next, the capacity calculation unit 2j determines whether the capacity of the air handling unit 3 is acceptable. When determining the capacity acceptance criteria, the capacity calculation unit 2j compares the operating time (t) of the air conditioner 1 with a reference time (t0) and determines whether the operating time is above the reference time (t≥t0) (S102). The capacity calculation unit 2j repeats the capacity acceptance criteria determination until the operating time becomes above the reference time.

[0041] When the operating time exceeds the reference time, the capacity calculation unit 2j determines the capacity determination conditions of the air handling unit 3. During the determination of the capacity determination conditions, the capacity calculation unit 2j calculates the capacity determination condition parameter ((TF-TFO) / t). n The capability calculation unit 2j determines whether the value of the capability determination condition parameter exceeds the first threshold ((TF-TFO) / t). n>X)(S103).

[0042] If the value of the capability determination condition parameter exceeds the first threshold, the capability calculation unit 2j increases the opening change amount (ΔPLS) of the indoor expansion valve 4a and adjusts the opening of the indoor expansion valve 4a according to the opening change amount (S104). When the opening change amount (ΔPLS) of the indoor expansion valve 4a is increased, the capability calculation unit 2j assigns an execution command for the control to the control unit 5a. Upon receiving the execution command, the control unit 5a increases the opening change amount of the indoor expansion valve 4a and actuates the indoor expansion valve 4a to adjust the opening of the indoor expansion valve 4a according to the opening change amount.

[0043] Next, the capability calculation unit 2j makes the sampling time (t) n The sampling time (t) during the determination of the current capability determination conditions is shortened. For example, the capability calculation unit 2j reduces the sampling time (t) during the determination of the current capability determination conditions. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Shorten the adjustment time (α)(t) n =t n-1 -α)(S105).

[0044] In contrast, the value of the capability determination condition parameter in S103 is below the first threshold ((TF-TFO) / t). n If the value of the capability determination condition parameter is less than or equal to X, the capability calculation unit 2j compares the value of the capability determination condition parameter with the second threshold (Y). For example, the capability calculation unit 2j determines whether the value of the capability determination condition parameter is less than the second threshold ((TF-TFO) / t). n <Y)(S106).

[0045] If the value of the capability determination condition parameter is less than the second threshold, the capability calculation unit 2j reduces the opening change amount (ΔPLS) of the indoor expansion valve 4a and adjusts the opening of the indoor expansion valve 4a according to the opening change amount (S107). When the opening change amount (ΔPLS) of the indoor expansion valve 4a is reduced, the capability calculation unit 2j assigns an execution command for the control to the control unit 5a. Upon receiving the execution command, the control unit 5a increases the opening change amount of the indoor expansion valve 4a and actuates the indoor expansion valve 4a to adjust the opening of the indoor expansion valve 4a according to the opening change amount.

[0046] Next, the capability calculation unit 2j makes the sampling time (t) n The sampling time (t) during the current capability determination condition is extended. For example, the capability calculation unit 2j extends the sampling time (t) during the current capability determination condition determination. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Extend the adjustment time (α)(t) n =t n-1+α)(S108).

[0047] In contrast, the value of the capability determination condition parameter in S106 is above the second threshold ((TF-TFO) / t). n In the case of ≥Y), the capability calculation unit 2j determines whether the air conditioner 1 is present during the entire sampling time (t). n It continues to operate in (S109).

[0048] Furthermore, if the sampling time (t) is made in S105... n Shorten, or in S108 reduce the sampling time (t) n If the length is extended, the capability calculation unit 2j will perform the same determination (S109).

[0049] When air conditioner 1 is in the entire sampling time (t) n While the air handling unit 1 continues to operate, the capacity calculation unit 2j re-determines the capacity determination condition of the air handling unit 3 (S103). At this time, the capacity calculation unit 2j resets the operating time (t) of the air handling unit 1 to zero (t=0) (S110). Then, based on the determination result of the capacity determination condition, the capacity calculation unit 2j appropriately repeats the subsequent processing (S104~S108).

[0050] In contrast, during the entire sampling time (t) from the air conditioner 1... n During the period of continuous operation of the air conditioner 1, the capacity calculation unit 2j determines the operation stop condition (S111). The operation stop condition is determined, for example, based on whether the capacity calculation unit 2j receives a signal indicating that the air conditioner 1 has stopped operating.

[0051] If the operation stop condition is not met, the capacity calculation unit 2j repeatedly checks whether the air conditioner 1 is running throughout the entire sampling time (t). n The determination of continuous operation in (S109). On the other hand, when the operation stop condition is met, the capacity terminal 2j stops the operation of the air conditioner 1 (S112).

[0052] Therefore, in this embodiment, the adjustment of the opening change amount and the change period of the opening change amount of the indoor expansion valve 4a is performed by the capacity calculation unit 2j, i.e., the outdoor unit 2. Thus, in addition to the same effects as Embodiment 1 described above, this embodiment also achieves the following effect: According to this embodiment, even when the air conditioner 1 has multiple air handling units 3, the capacity calculation unit 2j can uniformly adjust the opening change amount and the change period of the opening change amount of the indoor expansion valve 4a, and the outdoor unit 2 can uniformly manage the air conditioning capacity of each air handling unit 3.

[0053] Furthermore, in Embodiments 1 and 2 described above, the opening change amount and the change cycle of the opening change amount of the indoor expansion valve 4a were adjusted respectively when controlling the capacity of the air handling unit 3. However, the capacity control of the air handling unit 3 can also be performed through adjustments other than adjusting the opening change amount and change cycle of the indoor expansion valve 4a. For example, as an alternative to adjusting the opening change amount and change cycle of the indoor expansion valve 4a, or based on adjusting the opening change amount and change cycle of the indoor expansion valve 4a, the operating frequency of the compressor 2a of the outdoor unit 2 can also be adjusted. Hereinafter, embodiments 3 and 4 will be described for controlling the capacity of the air handling unit 3 by adjusting the operating frequency of the compressor 2a of the outdoor unit 2. Embodiment 3 is an embodiment in which the control body is the control unit 5a, and Embodiment 4 is an embodiment in which the control body is the capacity calculation unit 2j. In addition, the structure of the air conditioner 1 in these embodiments is the same as that in Embodiment 1 ( Figure 1 The same applies. Therefore, the following description of the structure of the air conditioner involved is omitted (see [reference]). Figure 1 The document also describes an example of the capability control of the air handling unit 3 in these embodiments.

[0054] (Implementation Method 3) Figure 3 The control flow of the control unit 5a during capacity control of the air handling unit 3 in this embodiment is shown. Furthermore, the control flow of the control unit 5a in this case is to... Figure 2 The control flow of Embodiment 1 shown is obtained by replacing a portion of the control flow with the control flow unique to Embodiment 3. Therefore, for the same control flow as Embodiment 1 described above, the same step numbers are added and the description is simplified; only the control flow unique to Embodiment 3 is described in detail.

[0055] like Figure 3 As shown, when the air conditioner 1 starts operating, the control unit 5a acquires the detection values ​​(temperature values) of the outlet temperature, liquid refrigerant temperature, gaseous refrigerant temperature, and intermediate refrigerant temperature from each detection unit 31c, 32c, 33c, and 34c (S101), and determines whether the air handling unit 3 meets the capability determination criteria. To determine whether the capability determination criteria are met, the control unit 5a determines whether the operating time of the air conditioner 1 is greater than or equal to a reference time (t≥t0) (S102). If the operating time is greater than or equal to the reference time, the control unit 5a determines whether the value of the capability determination condition parameter exceeds the first threshold ((TF-TFO) / t). n >X)(S103).

[0056] When the value of the capability determination condition parameter exceeds a first threshold, the control unit 5a increases the frequency change amount (ΔHz) of the compressor 2a and adjusts the operating frequency of the compressor 2a according to this frequency change amount (S301). When the frequency change amount of the compressor 2a is increased, the control unit 5a assigns an execution command for the control to the capability calculation unit 2j. Upon receiving the execution command, the capability calculation unit 2j increases the frequency change amount of the compressor 2a and operates the compressor 2a to adjust its operating frequency according to the frequency change amount. As a result, the operating frequency of the compressor 2a is greater than before the adjustment. The frequency change amount of the compressor 2a is a measure of the degree of change in the operating frequency of the compressor 2a, and is a change value that varies according to the value of the capability determination condition parameter. For example, the larger the value of the capability determination condition parameter, the larger the frequency change amount becomes. The value of the frequency change amount is tabulated and stored in the storage device of the control unit 5a in association with the value of the capability determination condition parameter, and is read into the memory when the frequency change amount is adjusted.

[0057] Next, control unit 5a adjusts the sampling time (t) n () shorten. For example, control unit 5a shortens the sampling time (t) when determining the current capability determination conditions. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Shorten the specified time (α)(t) n =t n-1 -α)(S105). Sampling time (t) n The time interval (α) until the next capability determination condition is met is equivalent to the frequency change cycle of compressor 2a, and in this embodiment, it is equivalent to the frequency change amount (ΔHz) change cycle. The specified time (α) is the sampling time (t). n The adjustment time can be arbitrarily set according to the air conditioning capacity of the air handling unit 3. The specified time (α) involved is the same as the adjustment time (α) in Embodiment 1 above, but it can also be different.

[0058] In contrast, the value of the capability determination condition parameter in S103 is below the first threshold ((TF-TFO) / t). n In the case of ≤X), the control unit 5a determines whether the value of the capability determination condition parameter is less than the second threshold ((TF-TFO) / t). n <Y)(S106).

[0059] When the value of the capability determination condition parameter is less than the second threshold, the control unit 5a reduces the frequency change amount (ΔHz) of the compressor 2a and adjusts the operating frequency of the compressor 2a according to this frequency change amount (S302). When reducing the frequency change amount of the compressor 2a, the control unit 5a assigns an execution command to the capability calculation unit 2j. Upon receiving the execution command, the capability calculation unit 2j reduces the frequency change amount of the compressor 2a and operates the compressor 2a to adjust its operating frequency according to the frequency change amount. As a result, the operating frequency of the compressor 2a is lower than before the adjustment. For example, the smaller the value of the capability determination condition parameter, the smaller the change amount of the compressor 2a.

[0060] Next, control unit 5a adjusts the sampling time (t) n For example, control unit 5a extends the sampling time (t) during the current capability determination condition determination. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Extend the specified time (α)(t) n =t n-1 +α)(S108). Furthermore, in this embodiment, the specified time (α) is equal to the sampling time (t). n The values ​​of (S105) are the same when the length is shortened, but they can also be different.

[0061] In contrast, the value of the capability determination condition parameter in S106 is above the second threshold ((TF-TFO) / t). n In the case of ≥Y), control unit 5a determines whether air conditioner 1 operates continuously throughout the entire sampling time (t≥t). n (S109). In this case, when determining the capability determination condition, it is equivalent to the value of the capability determination condition parameter being above the second threshold and below the first threshold. In this case, the frequency change (ΔHz) of compressor 2a is maintained without adjustment, and the sampling time is maintained at the value at the time of the last capability determination.

[0062] Furthermore, if the sampling time (t) is made in S105... n Shorten, or in S108 reduce the sampling time (t) n If the extension is extended, the control unit 5a will make the same decision (S109).

[0063] When the air conditioner 1 continues to operate throughout the sampling time, the control unit 5a again determines the capability determination condition of the air handling unit 3 (S103). At this time, the control unit 5a resets the operating time (t) of the air conditioner 1 to zero (t=0) (S110). Then, based on the determination result of the capability determination condition, the control unit 5a appropriately repeats the subsequent processing (S104~S108).

[0064] In contrast, during the entire sampling time (t) from the air conditioner 1... n During the period of continuous operation of the air conditioner 1, the control unit 5a determines the operation stop condition of the air conditioner 1 (S111). If the operation stop condition is not met, the control unit 5a repeats the process of checking whether the air conditioner 1 has stopped operating throughout the entire sampling time (t). n The determination of continuous operation in (S109). On the other hand, when the operation stop condition is met, the control unit 5a stops the operation of the air conditioner 1 (S112).

[0065] Therefore, according to this embodiment, in the capability determination condition parameter ((TF-TFO) / t) n When the value of ) exceeds the first threshold (X), the frequency change of compressor 2a can be increased (ΔHz), and the sampling time (t) can be reduced. n The time interval for determining the capability is shortened when the value of the capability determination condition parameter exceeds the first threshold, which corresponds to a large temperature difference between the blow-out temperature (TF) and the target blow-out temperature (TFO). Therefore, in this case, by increasing the frequency change of compressor 2a and shortening the sampling time, the determination interval for the capability determination condition, i.e., the change cycle of the frequency change of compressor 2a, can be shortened. Thus, the operating frequency of compressor 2a can be adjusted in a shorter cycle, allowing the blow-out temperature in the air handling unit 3 to reach the target blow-out temperature more quickly.

[0066] Furthermore, in the capability determination condition parameter ((TF-TFO) / t) n When the value of ) is less than the second threshold (Y), the frequency change of compressor 2a can be reduced (ΔHz), and the sampling time (t) can be reduced. n The frequency change period of compressor 2a is extended when the value of the capability judgment condition parameter is less than the second threshold, which corresponds to a small temperature difference between the blow-out temperature (TF) and the target blow-out temperature (TFO) and a fluctuating state. Therefore, by reducing the frequency change amount of compressor 2a and extending the sampling time, the frequency change period of compressor 2a can be extended. Thus, the operating frequency of compressor 2a can be adjusted over a longer period; that is, compared to the case where the temperature difference between the blow-out temperature and the target blow-out temperature is large, the frequency change period of compressor 2a can be delayed, allowing the blow-out temperature to reach the target blow-out temperature more efficiently.

[0067] Furthermore, when the value of the capability determination condition parameter is above the second threshold and below the first threshold, the frequency change of compressor 2a can be maintained without adjustment, and the sampling time can be maintained at the value of the last capability determination. When the value of the capability determination condition parameter is above the second threshold and below the first threshold, it corresponds to a relatively stable temperature difference between the outlet temperature and the target outlet temperature. Therefore, in this case, by maintaining the frequency change of compressor 2a and the sampling time, the frequency change cycle of compressor 2a can also be kept constant. Therefore, by combining the cases of a large and a small temperature difference between the outlet temperature and the target outlet temperature, the outlet temperature can be appropriately reached to achieve the target outlet temperature.

[0068] In this embodiment, the adjustment of the frequency change amount and the frequency change period of compressor 2a is performed instead of the adjustment of the opening amount and the opening change period of indoor expansion valve 4a. Therefore, the refrigerant circulation amount of the entire air conditioner 1 can be adjusted, thus stabilizing the operation of the refrigeration cycle. Furthermore, the adjustment of the frequency change amount of compressor 2a can be performed based on the adjustment of the opening change amount of indoor expansion valve 4a. In this case, for example, in... Figure 3 The process shown in step S301 is performed before or after the process. Figure 2 The process shown in step S104 is sufficient. Alternatively, for example, it can also be performed in... Figure 3 The process shown in step S302 is performed before or after the process. Figure 2 The process shown in step S107. This allows for the adjustment of both the frequency change of compressor 2a and the opening change of indoor expansion valve 4a.

[0069] Furthermore, for example, even if the air handling unit 3 is manufactured by a third party that is different from the outdoor unit 2, the expansion valve kit 4, and the controller 5, the air conditioning capability of the air handling unit 3 can be properly controlled, and the operation of the refrigeration cycle in the air conditioner 1 can be stabilized in the same way as in embodiment 1.

[0070] (Implementation Method 4) In this embodiment, the capacity calculation unit 2j of the outdoor unit 2 is used as the main body to perform capacity control of the air handling unit 3, including adjusting the opening change amount and the change cycle of the opening change amount of the indoor expansion valve 4a. In this case, the control content in the control flow of the capacity calculation unit 2j is the same as... Figure 3 The control flow of Embodiment 3 shown has the same steps, but the control entities are different. Therefore, in the description of Embodiment 4, refer to... Figure 3 The control flow is shown.

[0071] When the air conditioner 1 starts operating, the capacity calculation unit 2j acquires the detected values ​​(temperature values) of the outlet temperature, liquid refrigerant temperature, gaseous refrigerant temperature, and intermediate refrigerant temperature from the detection units 31c, 32c, 33c, and 34c (S101), and determines whether the capacity of the air handling unit 3 meets the determination criteria. To determine whether the capacity meets the determination criteria, the capacity calculation unit 2j determines whether the operating time of the air conditioner 1 is greater than or equal to a reference time (t≥t0) (S102). If the operating time is greater than or equal to the reference time, the capacity calculation unit 2j determines whether the value of the capacity determination condition parameter exceeds the first threshold ((TF-TFO) / t). n >X)(S103).

[0072] If the value of the capability determination condition parameter exceeds the first threshold, the capability calculation unit 2j increases the frequency change amount (ΔHz) of the compressor 2a and adjusts the operating frequency of the compressor 2a according to this frequency change amount (S301). As a result, the operating frequency of the compressor 2a is greater than before the adjustment.

[0073] Next, the capability calculation unit 2j makes the sampling time (t) n The sampling time (t) during the determination of the current capability determination conditions is shortened. For example, the capability calculation unit 2j reduces the sampling time (t) during the determination of the current capability determination conditions. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Shorten the specified time (α)(t) n =t n-1 -α)(S105).

[0074] In contrast, the value of the capability determination condition parameter in S103 is below the first threshold ((TF-TFO) / t). n In the case of ≤X), the capability calculation unit 2j determines whether the value of the capability determination condition parameter is less than the second threshold ((TF-TFO) / t). n <Y)(S106).

[0075] If the value of the capability determination condition parameter is less than the second threshold, the capability calculation unit 2j reduces the frequency change amount (ΔHz) of the compressor 2a and adjusts the operating frequency of the compressor 2a according to this frequency change amount (S302). As a result, the operating frequency of the compressor 2a is lower than before the adjustment.

[0076] Next, the capability calculation unit 2j makes the sampling time (t) n For example, control unit 5a extends the sampling time (t) during the current capability determination condition determination. n The sampling time (t) compared to the previous capability determination condition was used. n-1 Extend the specified time (α)(t) n =t n-1+α)(S108). Furthermore, in this embodiment, the specified time (α) is equal to the sampling time (t). n The values ​​of (S105) are the same when the length is shortened, but they can also be different.

[0077] In contrast, the value of the capability determination condition parameter in S106 is above the second threshold ((TF-TFO) / t). n In the case of ≥Y), the capability calculation unit 2j determines whether the air conditioner 1 is present during the entire sampling time (t). n The compressor 2a continues to operate (S109). In this case, the frequency change (ΔHz) of the compressor 2a is maintained without adjustment, and the sampling time remains at the value at the time of the last capacity determination.

[0078] Furthermore, if the sampling time (t) is made in S105... n Shorten, or in S108 reduce the sampling time (t) n If the length is extended, the capability calculation unit 2j will perform the same determination (S109).

[0079] While the air conditioner 1 continues to operate throughout the sampling time, the capacity calculation unit 2j re-determines the capacity determination condition of the air handling unit 3 (S103). At this time, the control unit 5a resets the operating time (t) of the air conditioner 1 to zero (t=0) (S110). Then, based on the determination result of the capacity determination condition, the capacity calculation unit 2j appropriately repeats the subsequent processing (S104~S108).

[0080] In contrast, during the entire sampling time (t) from the air conditioner 1... n During the period of continuous operation of the air conditioner 1, the capacity calculation unit 2j determines the operation stop condition of the air conditioner 1 (S111). If the operation stop condition is not met, the capacity calculation unit 2j repeatedly checks whether the air conditioner 1 has stopped operating throughout the entire sampling time (t). n The determination of continuous operation in (S109). On the other hand, when the operation stop condition is met, the capacity calculation unit 2j stops the operation of the air conditioner 1 (S112).

[0081] Therefore, in this embodiment, the adjustment of the frequency change amount and the frequency change period of the compressor 2a is performed by the capacity calculation unit 2j, i.e., the outdoor unit 2. Thus, in addition to the same effects as Embodiment 3 described above, this embodiment also achieves the following effect: According to this embodiment, even when the air conditioner 1 has multiple air handling units 3, the capacity calculation unit 2j can uniformly adjust the frequency change amount and the frequency change period of the compressor 2a, and the outdoor unit 2 can uniformly manage the air conditioning capacity of each air handling unit 3.

[0082] Here, in embodiments 1 to 4 described above, the temperature difference between the blow-out temperature (TF) and the target blow-out temperature (TFO) is used as a capability determination parameter for each predetermined time interval (t). n The change in ((TF-TFO) / t) n The value of ) is used. However, the value of the capability determination condition parameter is not limited to this, and other values ​​can also be used. Hereinafter, as embodiment 5, the change in temperature over a specified time interval ((TF-TFO) / t) excluding the temperature difference between the blow-out temperature and the target blow-out temperature is described. n Implementation of values ​​other than )

[0083] (Implementation Method 5) Figure 4 This is a circuit diagram schematically illustrating the structure of the air conditioner 10 according to this embodiment. Furthermore, the structure of the air conditioner 10 in Embodiment 5 is similar to that of the air conditioner 1 in Embodiment 1. Figure 1 The structure is basically the same as that of air conditioner 1. Specifically, therefore, for structures that are the same or similar to those of air conditioner 1, the same reference numerals are used on the attached drawings and descriptions are omitted.

[0084] like Figure 4 As shown, the air handling unit 30 includes, as its main components, a heat exchanger (indoor heat exchanger) 3a, a blower (indoor fan) 3b, a detection unit 3c, and a setting unit 3d. Additionally, Figure 1 As an example, only one air handling unit 30 is shown, but there can be multiple air handling units 30.

[0085] The detection unit 3c comprises four detection units: 32c, 33c, 34c, and 35c. That is, Figure 4 In the example shown, a fifth detection unit 35c is provided to replace... Figure 1 The example shown is the first detection unit 31c. These detection units 32c, 33c, 34c, and 35c are, for example, temperature sensors such as thermistors. The fifth detection unit 35c is configured, for example, near an intake port (not shown) of the air (indoor air) formed in the interior space within the housing 31, and detects the temperature of the indoor air drawn in by the indoor fan 3b (hereinafter referred to as the intake temperature). Indoor air is drawn into the housing 31 from the intake port by driving the indoor fan 3b, and its temperature is regulated through heat exchange in the indoor heat exchanger 3a. That is, the intake temperature is equivalent to the temperature of the indoor air before temperature regulation through heat exchange in the indoor heat exchanger 3a, in short, equivalent to the indoor temperature. The fifth detection unit 35c assigns the detected intake temperature to the control unit 5a of the controller 5. Furthermore, the fifth detection unit 35c can... Figure 1 The example shown is based on the detection unit 3c, and can also coexist with the first detection unit 31c.

[0086] In this embodiment, the temperature difference between the inhalation temperature (TA) and the target inhalation temperature (TAO) per sampling time (t) is used as a capability determination parameter. n The change in ((TA-TAO) / t) n The target intake temperature (TAO) is the target temperature of the air drawn in before temperature adjustment in the air handling unit 3, ultimately equivalent to the set room temperature. The value of the target intake temperature (TAO) is set by the user, for example, via the setting unit 3d, and stored in the memory of the control unit 5a. The temperature difference between the intake temperature (TA) and the target intake temperature (TAO) is an absolute value.

[0087] Therefore, according to this embodiment, when determining the capability determination condition, the control unit 5a or the capability calculation unit 2j calculates the capability determination condition parameter ((TA-TAO) / t) based on the values ​​of the inhalation temperature (TA) and the target inhalation temperature (TAO). n The value of the capability determination condition parameter is calculated and compared with the first threshold (X) and the second threshold (Y). For example, the control unit 5a or the capability calculation unit 2j determines whether the value of the capability determination condition parameter exceeds the first threshold ((TA-TAO) / t). n >X). Furthermore, for example, the control unit 5a or the capability calculation unit 2j determines whether the value of the capability determination condition parameter is less than the second threshold ((TA-TAO) / t). n <Y).

[0088] Figure 5 and Figure 6 The control flow of the control unit 5a or the capacity calculation unit 2j when controlling the capacity of the air handling unit 30 according to this embodiment is shown in the figure. Figure 5 This is the control process for adjusting the opening change amount and the change cycle of the opening change amount of the indoor expansion valve 4a respectively. Figure 6 This is the control process for adjusting the frequency change amount and the frequency change period of compressor 2a.

[0089] When adjusting the opening change amount and the change cycle of the opening change amount of the indoor expansion valve 4a respectively, such as Figure 5 As shown, in steps 501 and 502, the capability determination condition parameter ((TA-TAO) / t) is... n The value of ) is compared with the first threshold (X) and the second threshold (Y), and the capability determination condition is determined. Other than this, the control content is the same as the steps of the control flow in Embodiments 1 and 2 described above. Figure 2 )same.

[0090] When adjusting the frequency change amount and the frequency change period of compressor 2a, such as Figure 6As shown, in steps 501 and 502, the capability determination condition parameter ((TA-TAO) / t) is... n The value of ) is compared with the first threshold (X) and the second threshold (Y), and the capability determination condition is determined. Other than this, the control content is the same as the steps of the control flow in Embodiments 3 and 4 described above. Figure 3 )same.

[0091] Therefore, this embodiment can also achieve the same effect as the embodiments 1 to 4 described above.

[0092] The foregoing has described several embodiments of the present invention, but these embodiments are merely illustrative and not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are all included in the scope and spirit of the invention, and also within the scope of the invention and its equivalents as described in the patent claims. Label Explanation

[0093] 1. 10 air conditioners 2 Outdoor Units 2a Compressor 2b Oil separator 2c Check valve 2d four-way valve 2e heat exchanger (outdoor heat exchanger) 2F air blower (outdoor fan) 2g expansion valve (outdoor expansion valve) 2h reservoir 2i suction cup 2j Computational Department 2K Setting Department 3.30 Air handling units 3a heat exchanger (indoor heat exchanger) 3b. Ventilation fan (indoor fan) 3C Testing Department 3D Design Department 4 Expansion Valve Kit 4a Expansion Valve (Indoor Expansion Valve) 5. Interface Controller (Controller) 5a Control Department 6 flow path 21k First Setting Department 22k Second Setting Department 31c First Inspection Department 32c Second Inspection Department 33c Third Inspection Department 34c Fourth Inspection Department 35c, 5th Inspection Department.

Claims

1. An air conditioner, characterized in that, include: An outdoor unit, which includes a compressor, an outdoor heat exchanger, an outdoor blower, an outdoor expansion valve, and a control unit for controlling the operation of the compressor; An expansion valve kit that includes an indoor expansion valve; At least one air handling unit, the at least one air handling unit having an indoor heat exchanger and an indoor air supply fan; as well as The controller causes the indoor expansion valve to actuate. When the parameter value representing the temperature change of the air blown out by the indoor fan or the parameter value representing the temperature change of the air drawn in by the indoor fan is not within the range specified by a first threshold and a second threshold smaller than the first threshold, the control unit or the controller adjusts the opening degree of the indoor expansion valve and the change cycle of the opening degree, or the operating frequency of the compressor and the change cycle of the operating frequency, respectively. If the parameter value exceeds the first threshold, the control unit or the controller increases the opening degree of the indoor expansion valve and shortens the opening degree change cycle. If the parameter value is less than the second threshold, the control unit or the controller reduces the opening degree of the indoor expansion valve and extends the change cycle of the opening degree.

2. The air conditioner as described in claim 1, characterized in that, The control unit sends instructions to the controller to adjust the opening degree of the indoor expansion valve and the change cycle of the opening degree, respectively. The controller accepts the instructions and adjusts the opening degree of the indoor expansion valve and the change cycle of the opening degree, respectively.

3. An air conditioner, characterized in that, include: An outdoor unit, which includes a compressor, an outdoor heat exchanger, an outdoor blower, an outdoor expansion valve, and a control unit for controlling the operation of the compressor; An expansion valve kit that includes an indoor expansion valve; At least one air handling unit, the at least one air handling unit having an indoor heat exchanger and an indoor air supply fan; as well as The controller causes the indoor expansion valve to actuate. When the parameter value representing the temperature change of the air blown out by the indoor fan or the parameter value representing the temperature change of the air drawn in by the indoor fan is not within the range specified by a first threshold and a second threshold smaller than the first threshold, the control unit or the controller adjusts the opening degree of the indoor expansion valve and the change cycle of the opening degree, or the operating frequency of the compressor and the change cycle of the operating frequency, respectively. If the parameter value exceeds the first threshold, the control unit or the controller increases the operating frequency of the compressor and shortens the frequency change cycle. If the parameter value is less than the second threshold, the control unit or the controller reduces the operating frequency of the compressor and extends the cycle of frequency change.

4. The air conditioner as described in claim 3, characterized in that, The controller sends instructions to the control unit to adjust the operating frequency of the compressor and the cycle of the operating frequency, respectively. The control unit accepts the instructions and adjusts the operating frequency of the compressor and the cycle of the operating frequency, respectively.

5. The air conditioner as described in claim 1 or 3, characterized in that, The parameter value representing the temperature change of the air blown out of the indoor fan is obtained by dividing the temperature difference between the temperature of the air blown out of the indoor fan and the target temperature of the air blown out of the indoor fan by the change period of the opening degree or the change period of the operating frequency. The parameter value representing the temperature change of the air drawn in by the indoor fan is obtained by dividing the temperature difference between the temperature of the air drawn in by the indoor fan and the target temperature of the air drawn in by the indoor fan by the change cycle of the opening degree or the change cycle of the operating frequency.

6. The air conditioner as described in any one of claims 1 to 4, characterized in that, The air handling unit or the outdoor unit has a first setting unit, which sets whether the opening degree of the indoor expansion valve and the change cycle of the opening degree or the operating frequency of the compressor and the change cycle of the operating frequency are adjusted by the control unit or the controller.

7. The air conditioner as described in any one of claims 1 to 4, characterized in that, The air handling unit or the outdoor unit has a second setting unit, which is set to adjust the opening degree of the indoor expansion valve and the cycle of the opening degree, or to adjust the operating frequency of the compressor and the cycle of the operating frequency.

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