JP2002216227A - Control device and control method for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device and control method for compressor capable of exhibiting a proper cooling capacity according to the state while of a compressor while properly keeping the balance between the load and cooling capacity of the compressor. SOLUTION: This control device is provided with a rotating speed change part 21 for changing and outputting the rotating speed instructed to an inverter compressor 10 according to a prescribed change pattern with the lapse of time from the starting of the inverter compressor 10, and a rotating speed instruction part 22 for instructing the rotating speed outputted from the rotating speed change part 21 to the inverter compressor 10. The rotating speed change part 21 reads a rotating speed change time according to the operation mode and the number of operating evaporators 3, changes the rotating speed according to the prescribed change pattern every lapse of this rotating speed change time, and outputs the changed rotating speed to the rotating speed instruction part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device and a control method for a compressor constituting a cooling cycle of a vending machine, and more particularly, to a control device and a control method in which the control of the rotational speed of the compressor is improved.

[0002]

2. Description of the Related Art For example, a vending machine for heating and cooling a product such as a canned beverage has conventionally been provided with a constant speed compressor constituting a cooling cycle, and by controlling ON / OFF of the constant speed compressor, It exhibits a predetermined cooling capacity. The interior of a product room for storing products of a vending machine (hereinafter referred to as a refrigerator) is usually divided into a plurality of rooms (for example, three rooms), and each room is cooled or heated by a controller and cooled. And a heated product can be provided by a single vending machine.

Hereinafter, a cooling cycle of a vending machine will be described with reference to a vending machine in which the inside of a refrigerator is divided into three rooms. FIG. 6 is a schematic diagram showing a conventional vending machine,
FIG. 7 is a block diagram showing the input / output relationship of the controller.
FIG. 8 is a block diagram showing a control method of the constant speed compressor, and FIG.
Is a flowchart showing a method of controlling the solenoid valve and the compressor according to the temperature in the refrigerator, and FIG. 10 is a timing chart showing operations of the solenoid valve and the compressor according to the temperature in the refrigerator.

[0006] As shown in FIG. 6, a product room 1 of a vending machine is provided.
Is divided into three chambers (in the figure, a left chamber 1a, a middle chamber 1b, and a right chamber 1c). Further, the machine room 2 is provided with a condenser 5, a constant speed compressor 6, an electromagnetic valve 7, a capillary tube 8 as an expander, and the like, and these are connected to the evaporator 3 by piping to constitute a cooling unit. are doing.

Although not shown in FIG. 6, a controller 9 for controlling each component of the cooling unit is provided inside the vending machine. The controller 9 is operated by operating a switch (not shown) or the like. "CC
One of three operation modes, "C", "CCH", and "CHH", according to the number of commodity rooms to be cooled, can be selectively operated. Here, “C” represents cooling (cold) of the product, “H” represents heating (hot) of the product, and “CCC” means that all three of the product rooms are cold-operated. , "CCH"
“CHH” means cold operation of two rooms and hot operation of two rooms, and “CHH” means hot operation of two rooms. The hot operation is performed by a heater (not shown), and the cold operation is performed by the cooling unit described above.

As shown in FIGS. 7 and 8, the cold operation by the controller 9 is performed by controlling the temperature of each of the chambers 1a, 1b, 1c obtained by the internal temperature sensors 4 provided for each of the chambers 1a, 1b, 1c. Based on the information (inside temperature Tr, evaporation temperature (entrance temperature of evaporator 3) Te, etc.), the solenoid valves 7 corresponding to the respective chambers 1a, 1b, 1c are individually controlled to open and close, and a constant speed compressor. 6 and the fan of the condenser 5 by ON / OFF control (start / stop control). In addition, along with the opening / closing control of the electromagnetic valve 7, the fan of the evaporator 3 is also driven / stopped.

Next, the content of control of the cooling of the product by the controller 9 will be described with reference to an example of the "CCC" mode in which all the three rooms are in the cold operation.

As shown in FIG. 9, first, the inside temperature of each of the commodity rooms 1a, 1b, 1c is read by the inside temperature sensor 4 (step 10 (S10)), and each temperature information obtained by reading these is obtained. , The ON / OFF control of the solenoid valve 7 is performed for each of the chambers 1a, 1b, 1c (S1).
1). That is, for example, the solenoid valve 7 is turned on when the inside temperature is 4 ° C. or higher, and the solenoid valve 7 is turned off when the inside temperature is 0 ° C. or less (S11). In addition, when the temperature exceeds 0 ° C. and 4
In the range below ℃, the previous change state is maintained.
That is, the temperature inside the refrigerator becomes 4 ° C. or more, and the solenoid valve 7 is turned on.
ON afterwards, until the temperature in the refrigerator becomes 0 ° C or less
While the state is maintained, when the temperature in the refrigerator becomes 0 ° C. or less and the solenoid valve 7 is turned off, the OFF state is thereafter maintained until the temperature in the refrigerator becomes 4 ° C. or more.

Next, ON / OFF control of the constant speed compressor 6 is performed (S12). That is, for example, when at least one of the three solenoid valves 7 is in an ON state (open state),
The operation is performed with the constant speed compressor 6 turned on, and the three solenoid valves 7
Are all in the OFF state (closed state), the constant speed compressor 6 is turned off and stopped, and the interior of each product room is kept at 0 ° C.
Maintain in the range of 4 ° C. The above is the control in the steady operation. Each of the chambers 1a, 1b,
FIG. 10 is a timing chart showing the operation timing of the solenoid valve 7 and the constant-speed compressor 6 of 1c.

[0010]

By the way, in the vending machine, the demand for cooled products is increased in the summer season, and in order to cope with this demand, all three rooms are operated by cold operation "CC".
The "C" mode is selected. On the other hand, in the winter, the demand for cooled products is reduced and the demand for heated products is increased. It is common to operate in the "CCH" mode in the middle of the spring and fall seasons. Therefore, the operation mode differs depending on the seasonal change in the outside air temperature, the operation mode, and the like, and the load of the cooling unit greatly changes.

However, conventionally, as described above, the constant speed compressor 6 is used as the compressor, and the ON / OF of the constant speed compressor 6 is used.
Since only the F is changed to cope with the load fluctuation, the cooling capacity to be exhibited depends on the cold single-room operation in winter ("CHH" mode) (at light load) and the cold operation in all rooms in summer (" CCC "mode) (at the time of large load), while the capacity of the constant-speed compressor 6 is constant, so that the cooling capacity is excessive with respect to the load at light loads other than summer. As a result, there is a problem that the operation consumes energy wastefully, and the energy loss is particularly large in winter.

Further, conventionally, the product temperature was kept in an appropriate range only by controlling the constant speed compressor ON / OFF in accordance with the temperature in the refrigerator. If the same control is performed between when the product is replenished and when the product in the refrigerator is already sufficiently cooled, the product will not be cooled sufficiently or the energy will be saved by the time the product is purchased. From the viewpoint of the above, it is not necessarily appropriate.

[0013] The present invention has been made in view of the above, and it is possible to cause a compressor to exhibit an appropriate cooling capacity according to a load and to appropriately balance a load and a cooling capacity. It is an object of the present invention to provide a compressor control device and a control method described above.

[0014]

In order to achieve the above object, a control device for a compressor according to claim 1 of the present invention comprises:
An evaporator, a condenser, an expansion mechanism, a cooling unit having at least a compressor, and a controller for a compressor in a vending machine including a controller that controls the cooling unit, wherein the compressor is an inverter compressor And a controller that changes a rotation speed commanded to the inverter compressor according to a predetermined change pattern and outputs the rotation speed in accordance with a lapse of time from the start of activation of the inverter compressor. A rotation speed commanding unit for commanding the rotation speed output from the rotation speed change unit to the inverter compressor.

Here, the inverter compressor differs from the conventional constant speed compressor in which the cooling capacity can be varied only by ON / OFF control of whether to rotate at a constant speed or to stop at a constant speed. The cooling capacity to be exerted can be varied according to the number.

The rotational speed command section instructs the rotational speed of the inverter compressor capable of controlling the rotational speed as described above, and the rotational speed changing section controls the time from the start of the inverter compressor. As the time elapses, the rotation speed command unit changes the rotation speed commanded to the inverter compressor according to a predetermined change pattern and outputs the changed rotation speed to the rotation speed command unit. Is determined experimentally in advance so that the balance between the two is appropriate.

As described above, according to the compressor control device of the first aspect, the rotational speed changing unit appropriately balances the load and the cooling capacity with the elapse of time from the start of the start of the inverter compressor. The rotational speed changed according to the rotational speed change pattern experimentally obtained in advance is output to the rotational speed command unit, and the rotational speed command unit instructs the input rotational speed to the inverter compressor. Thereby, the inverter compressor can perform an operation in which the load and the cooling capacity are appropriately balanced.

According to a second aspect of the present invention, there is provided the compressor control device according to the first aspect, wherein the vending machine has an internal temperature and / or an elapsed time corresponding to the elapsed time. An internal temperature detection unit that detects a temperature gradient of the internal temperature, the rotation speed changing unit includes a plurality of types of change patterns different from each other, and the internal temperature and the internal temperature detected by the internal temperature detection unit. And / or when the temperature gradient deviates from a preset range, selects a corresponding change pattern from the plurality of types of change patterns, and outputs the number of revolutions changed according to the selected change pattern. It is characterized by.

According to the control device for a compressor according to the second aspect, the rotation speed changing unit changes the rotation speed to a rotation speed in which the balance between the load and the cooling capacity is optimized in advance according to the change pattern. Even when the number command unit instructs the changed rotational speed to the inverter compressor, actually, the internal temperature or the temperature gradient may be out of the desired range due to various environmental factors. However, according to the control device for a compressor according to the second aspect, the temperature inside the vending machine detected by the temperature inside the refrigerator and / or the temperature gradient of the temperature inside the refrigerator with respect to the elapsed time is preset. When the rotation is out of the range, the rotation speed changing unit selects a rotation speed change pattern suitable for returning the in-chamber temperature or the temperature gradient to a desired range from a plurality of types of change patterns. Selected variables In order to output the rotation speed according to the pattern, the rotation speed command unit instructs the inverter compressor to input the rotation speed input from the rotation speed change unit, and balances the load between the inverter compressor and the cooling capacity. It is possible to operate at a rotation speed such that the temperature inside the refrigerator and the temperature gradient fall within a preset range while the suitability is maintained.

Note that the preset range for the internal temperature of the vending machine and the preset range for the temperature gradient of the internal temperature with respect to the elapsed time respectively have a balance between the load and the cooling capacity. It refers to the range of the internal temperature and the range of the temperature gradient set when it is appropriate.

According to a third aspect of the present invention, in the compressor control device according to the first or second aspect, the change pattern corresponds to the number of the commodity rooms to be cooled. Operating mode, number of operating evaporators, stop time of the inverter compressor, ambient temperature outside the vending machine (outside air temperature), temperature of the outer surface of the vending machine, sucked into the condenser The temperature is set based on at least one of the temperature of the intake air and the four seasons information.

According to the control device for a compressor according to the third aspect, the change pattern is an operation mode corresponding to the number of the commodity rooms to be cooled, the number of operating evaporators, and the environmental factors. To the stop time of the inverter compressor, the ambient temperature outside the vending machine, the temperature of the outer surface of the vending machine, the temperature of suction air sucked into the condenser, or four seasons information, or a combination thereof. Therefore, the inverter compressor can be operated while appropriately maintaining the balance between the load and the cooling capacity even in an environment affected by these factors.

According to a fourth aspect of the present invention, there is provided a compressor control device according to any one of the first to third aspects, wherein the rotational speed command unit includes the inverter compression unit. Until a predetermined elapsed time from the start of the start of the compressor, or until a predetermined elapsed time after the number of evaporators being operated changes, an initial rotation speed command unit for commanding an initial rotation speed to the inverter compressor. It is characterized by having.

During a predetermined elapsed time from the start of the start of the inverter compressor or within a predetermined elapsed time after the number of operating evaporators changes, it is different from the steady operation in which the inverter compressor operates stably. It is preferable that the operation during this period be performed as an initial operation and control different from the steady operation be performed. According to the control device for a compressor according to the fourth aspect, the rotational speed command unit exclusively performs the inverter compression during the initial operation. By providing the initial rotation speed command unit for commanding the initial rotation speed to the machine, the control of the initial operation and the control of the steady operation can be accurately separated, and the easiness of the control can be improved.

According to a fifth aspect of the present invention, there is provided a compressor control device according to any one of the first to third aspects, wherein the rotation speed command unit includes the inverter compression unit. From the start of the start of the machine, until the temperature in the refrigerator of the vending machine or the temperature of the product stored in the vending machine (product temperature) reaches a predetermined temperature, or the number of operating evaporators changes. After that, until the temperature in the refrigerator of the vending machine or the temperature of the product stored in the vending machine reaches a predetermined temperature, an initial rotation speed command unit for commanding the initial rotation speed to the inverter compressor is provided. It is characterized by having.

From the start of the inverter compressor until the internal temperature or the product temperature reaches a predetermined temperature, or until the internal temperature or the product temperature reaches the predetermined temperature after the number of operating evaporators changes, the inverter compressor is not used. It is preferable that the operation during this period is set as the initial operation and the control is performed differently from the steady operation because the operation during the period is different from the steady operation. ,
The rotation speed command unit is provided with an initial rotation speed command unit for exclusively commanding the initial rotation speed to the inverter compressor during the initial operation, so that the control of the initial operation and the control of the steady operation can be accurately separated. Thus, the controllability can be improved.

According to a sixth aspect of the present invention, there is provided a compressor control device according to the fourth or fifth aspect, wherein the initial rotation speed is determined according to the number of the commodity chambers to be cooled. Operating mode, number of operating evaporators, stop time of the inverter compressor, ambient temperature outside the vending machine, temperature on the outer surface of the vending machine, suction air sucked into the condenser The temperature is set based on at least one of the temperature and the four seasons information.

According to the control device for a compressor of the sixth aspect, the operation mode and the operation mode of the evaporator which are operating according to the number of the commodity rooms to be cooled are also environmental factors regarding the initial rotation speed. Number, shutdown time of the inverter compressor, ambient temperature outside the vending machine, temperature of the outer surface of the vending machine, temperature of suction air sucked into the condenser, or four seasons information, or a combination thereof Therefore, in the environment affected by these factors, the initial operation of the inverter compressor can be operated while appropriately maintaining the balance between the load and the cooling capacity.

A compressor control method according to a seventh aspect of the present invention includes a cooling unit having at least an evaporator, a condenser, an expansion mechanism, and a compressor, and a controller for controlling the cooling unit. In the method for controlling a compressor in a vending machine, the compressor is an inverter compressor, and the controller is configured to instruct the inverter compressor to instruct a rotational speed according to a lapse of time from the start of the inverter compressor. Is output according to a predetermined change pattern, and the output rotational speed is commanded to the inverter compressor.

According to the compressor control method of the present invention, the balance between the load and the cooling capacity is experimentally determined in advance as the time elapses from the start of the start of the inverter compressor so that the balance between the load and the cooling capacity becomes appropriate. By instructing the inverter compressor of the rotation speed changed according to the changed rotation speed change pattern, the inverter compressor can perform an operation in which the load and the cooling capacity are appropriately balanced.

According to a control method of a compressor according to claim 8 of the present invention, in the control method of the compressor according to claim 7, the internal temperature of the vending machine and / or the internal temperature of the vending machine with respect to the elapsed time are different. Detecting a temperature gradient of a temperature, and when the detected inside temperature and / or the detected temperature gradient deviate from a predetermined range, a corresponding one of a plurality of different types of the change patterns prepared in advance. Select the change pattern to be output, and output the number of revolutions changed according to the selected change pattern.

According to the compressor control method of the eighth aspect, the detected internal temperature of the vending machine and / or the temperature gradient of the internal temperature with respect to the elapsed time is out of a preset range. When the rotation speed change pattern suitable for returning the internal temperature and temperature gradient to the desired range,
By selecting from among a plurality of types of change patterns, outputting the number of rotations according to the selected change pattern, and instructing the number of rotations to the inverter compressor, the inverter compressor is controlled by the load and the cooling capacity. While optimizing the balance, the operation can be performed at a rotation speed such that the temperature inside the refrigerator or the temperature gradient falls within a preset range.

According to a ninth aspect of the present invention, there is provided a compressor control method according to the seventh or eighth aspect, wherein the change pattern includes an operation corresponding to the number of the commodity rooms to be cooled. Mode, number of operating evaporators, downtime of the inverter compressor, ambient temperature outside the vending machine, temperature on the outer surface of the vending machine, temperature of suction air sucked into the condenser , And four season information.

According to the compressor control method of the ninth aspect, the change pattern is an operation mode corresponding to the number of the commodity rooms to be cooled, the number of operating evaporators, and the environmental factors. To the stop time of the inverter compressor, the ambient temperature outside the vending machine, the temperature of the outer surface of the vending machine, the temperature of suction air sucked into the condenser, or four seasons information, or a combination thereof. Therefore, the inverter compressor can be operated while appropriately maintaining the balance between the load and the cooling capacity even in an environment affected by these factors.

According to a tenth aspect of the present invention, there is provided a compressor control method according to the seventh to ninth aspects, wherein the compressor is operated until a predetermined elapsed time from the start of the start of the inverter compressor. Until a predetermined elapsed time after the number of evaporators that have changed, with respect to the inverter compressor,
It is characterized by instructing the initial rotation speed.

According to the compressor control method of the tenth aspect, until the predetermined elapsed time from the start of the inverter compressor or until the predetermined elapsed time after the number of operating evaporators changes. By instructing the initial rotation speed to the inverter compressor during the initial operation, the control of the initial operation and the control of the steady operation can be accurately distinguished, and the easiness of the control can be improved.

[0037] According to a control method of a compressor according to claim 11 of the present invention, in the control method of the compressor according to claims 7 to 9, the internal temperature of the vending machine from the start of the start of the inverter compressor. Or, until the temperature of the product stored in the vending machine reaches a predetermined temperature, or after the number of operating evaporators changes, the temperature in the refrigerator of the vending machine or stored in the vending machine Until the temperature of the product reaches a predetermined temperature, an initial rotation speed is instructed to the inverter compressor.

According to the compressor control method of the eleventh aspect, the temperature inside the vending machine or the temperature of the goods stored in the vending machine reaches a predetermined temperature from the start of the start of the inverter compressor. Or until the temperature inside the vending machine or the temperature of the goods stored in the vending machine reaches a predetermined temperature after changing the number of operating evaporators, or during the initial operation. By providing the initial rotation speed command unit for commanding the initial rotation speed to the machine, the control of the initial operation and the control of the steady operation can be accurately separated, and the easiness of the control can be improved.

According to a control method of a compressor according to claim 12 of the present invention, in the control method of a compressor according to claim 10 or 11, the initial rotation speed is determined according to the number of the commodity chambers to be cooled. Operating mode, number of operating evaporators, stop time of the inverter compressor, ambient temperature outside the vending machine, temperature on the outer surface of the vending machine, suction air sucked into the condenser Temperature and seasonal information,
Is set based on at least one of the following.

According to the compressor control method of the twelfth aspect, the operation mode and the operating mode of the operating evaporator according to the number of the commodity rooms to be cooled are also environmental factors regarding the initial rotation speed. Number, stop time of the inverter compressor, ambient temperature outside the vending machine, temperature of the outer surface of the vending machine, temperature of suction air sucked into the condenser,
Or, it is set based on four seasons information or a combination of these, so in the environment affected by these factors, the initial operation of the inverter compressor can be properly balanced with the load and cooling capacity. You can drive while keeping it.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a control device and a control method for a compressor according to the present invention will be described in detail with reference to the drawings. The present invention is not limited by the embodiment.

FIG. 1 is a block diagram showing a control device for a compressor according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing a vending machine provided with the control device shown in FIG. 1, and FIG. FIG. 4 is a block diagram showing the input / output relationship of the controller, and FIG. 4 is a flowchart showing a control method of the compressor. In the following description, the same components as those already described in the related art are denoted by the same reference numerals, and redundant description will be omitted.

Further, in this embodiment, as shown in FIG. 2, the vending machine has three product rooms 1a and 1a.
Although it is divided into b and 1c, the compressor control device and control method of the present invention are not limited to this embodiment. In the present embodiment, the operation mode (the mode indicating the cooling and heating of the three chambers 1a, 1b, and 1c: CCC, CCH, and CHH) is CCC (the three chambers 1).
a, 1b, and 1c).

First, the overall structure will be described with reference to FIGS.
It will be described based on. The opening / closing control of the solenoid valve 7 and the start / stop control of the inverter compressor 10 are the same as the opening / closing control of the solenoid valve and the start / stop control of the low-pressure compressor in the related art using the constant speed compressor, and are different from the related art. Is that an inverter compressor 10 is provided instead of the constant speed compressor (FIG. 2), and an inverter 11 for controlling the inverter compressor 10 is provided (FIG. 3).

The control device for a compressor according to this embodiment changes the rotation speed commanded to the inverter compressor 10 in accordance with a predetermined change pattern as time elapses from the start of the start of the inverter compressor 10. A rotation speed changing unit 21 for outputting the rotation speed and a rotation speed command unit 22 for commanding the rotation speed output from the rotation speed changing unit 21 to the inverter compressor 10.

Here, the rotation speed changing unit 21 includes the time since the start of the start of the inverter compressor 10, the time during which the inverter compressor 10 was stopped, the number of evaporators 3 in operation, and the operation mode. , The internal temperature and the product temperature are input, and the preset number of rotations shown in Table 1 according to the operation mode and the number of operating evaporators 3 (the number of operating evaporators: one to three chambers) The change time tref (t1, t2,..., T6) is read.

[0047]

[Table 1]

Further, the rotation speed change time tref is the time from when the rotation speed to be output to the rotation speed command unit 22 is changed in accordance with the input time from the start of the inverter compressor 10 until the rotation speed is changed. Means time. Note that the reference table of the rotation speed change time shown in Table 1 is
Part of the change pattern.

The change pattern of the rotation speed is based on “change 1” shown in Table 5 described later, and the input time tn from the start of the start of the inverter compressor 10 reaches the corresponding rotation speed change time tref. Then, the rotation speed output to the rotation speed command unit 22 is changed according to the change pattern of “change 1”. Here, the change pattern of the number of revolutions by “change 1” is set, for example, as shown in FIG. 5, and is a change pattern in which the balance between the load and the cooling capacity is optimized under a specific experimental environment.

As the preset change pattern of the number of rotations, in addition to the above-mentioned basic "change 1", "change 2", "change 3", and "change 4" having different numbers of rotations are prepared. ing. This is because the load fluctuates due to environmental factors such as the outside air temperature of the vending machine in which the inverter compressor 10 is mounted, and the change pattern optimized under the specific experimental environment described above (“Change 1”) If the cooling rate of the internal temperature (temperature gradient with respect to time) or the internal temperature itself does not reach a desired level, it is set in advance as a change pattern of the number of revolutions that can reach the desired level. It is a thing.

That is, the rotation speed changing unit 21 provides the maximum cooling rate Tkmax / t (2) (° C./min) shown in Table 2 and the minimum cooling rate Tkmin / t (3) ( ° C / min)
Is set, and the rotation speed changing unit 21 selects a change pattern according to the criterion shown in Table 4. In Table 4, “no change” means that the rotation speed is maintained as it is before the rotation speed change time is reached and there is no need to change the rotation speed.

[0052]

[Table 2]

[0053]

[Table 3]

[0054]

[Table 4]

The reference temperature in the "change 4" is the internal temperature when the inverter compressor 10 is started or when the rotation speed is changed, and the operation time of the inverter compressor 10 is also determined when the rotation speed is changed. Is 0 when the
Shall be reset to (zero).

A new rotation speed N corresponding to the thus determined change pattern is determined with reference to a reference table shown in Table 5, and the determined new rotation speed N is determined by the rotation speed command unit 22. Output to In addition, the new rotation speed N corresponding to “change 1” is obtained by adding the rotation speed change amount Δ1 to the current rotation speed N.
N is added, and this rotation speed change amount Δ1N is referred to a change table shown in Table 6 according to the time during which the inverter compressor 10 is stopped and the number of evaporators 3 that are operating. Ask.

[0057]

[Table 5]

[0058]

[Table 6]

Here, the shorter the compressor stop time, the higher the load because the outside air temperature is higher, and the larger the number of operating evaporators 3, the higher the load. Therefore, Δ1N1> Δ1N
5> Δ1N15, Δ1N1>Δ1N11> Δ1N15.

Similarly, the new rotation speed N corresponding to "change 2" is obtained by adding the rotation speed change amount .DELTA.2N to the current rotation speed N, and this rotation speed change amount .DELTA.2N Is obtained by referring to the change table shown in Table 7 according to the time during which the evaporator 3 is stopped and the number of evaporators 3 that are operating. The rotational speed change amount Δ3N is added to the number N, and the rotational speed change amount Δ3N is calculated according to the time during which the inverter compressor 10 was stopped and the number of evaporators 3 in operation. The new rotation speed N corresponding to “change 4” is obtained by adding the rotation speed change amount Δ4N to the current rotation speed N, and this rotation speed change amount Δ4N
Is obtained by referring to the change table shown in Table 9 according to the time during which the inverter compressor 10 has stopped and the number of evaporators 3 that are operating.

[0061]

[Table 7]

[0062]

[Table 8]

[0063]

[Table 9]

Here, Δ2N1>Δ2N5> Δ2N1
5, Δ2N1>Δ2N11> Δ2N15, Δ3N1> Δ
3N5> Δ3N15, Δ3N1>Δ3N11> Δ3N1
5, Δ4N1>Δ4N5> Δ4N15, Δ4N1> Δ4
N11> Δ4N15.

The change table described above stores each change pattern (“change 1” to “change 4”) in the inverter compressor 10.
The change amount ΔN of the rotation speed is set in accordance with the stop time of the compressor and the number of evaporators 3 in operation, but the outside air temperature is applied instead of the stop time of the inverter compressor 10 and
As shown in Table 13, a change table in which a change amount ΔN of the rotation speed is set according to the outside air temperature and the number of evaporators 3 that are operating may be applied.

[0066]

[Table 10]

[0067]

[Table 11]

[0068]

[Table 12]

[0069]

[Table 13]

Here, Δ1N21>Δ1N16> Δ1N
28, Δ1N21>Δ1N33> Δ1N28, Δ2N2
1>Δ2N16> Δ2N28, Δ2N21> Δ2N33
> Δ2N28, Δ3N21>Δ3N16> Δ3N28,
Δ3N21>Δ3N33> Δ3N28, Δ4N21> Δ
4N16> Δ4N28, Δ4N21>Δ4N33> Δ4
N28.

Similarly, as shown in Tables 14 to 17, even when a change table in which a change amount ΔN of the rotation speed is set according to the season information and the number of operating evaporators 3 is applied. Good.

[0072]

[Table 14]

[0073]

[Table 15]

[0074]

[Table 16]

[0075]

[Table 17]

Note that Δ1N36>Δ1N35> Δ1N3
7> Δ1N34, Δ1N36>Δ1N40> Δ1N4
4, Δ2N36>Δ2N35>Δ2N37> Δ2N3
4, Δ2N36>Δ2N40> Δ2N44, Δ3N36
>Δ3N35>Δ3N37> Δ3N34, Δ3N36>
Δ3N40> Δ3N44, Δ4N36>Δ4N35> Δ
4N37> Δ4N34, Δ4N36>Δ4N40> Δ4
N44.

Other than this, the outer surface temperature of the vending machine,
The number of revolutions may be set according to the temperature of the intake air sucked into the condenser 5 and the number of operating evaporators.

The rotation speed command unit 22 is provided with the inverter compressor 1
0 until the predetermined elapsed time from the start of activation of 0, or until the predetermined elapsed time after the number of operating evaporators 3 changes.
An initial rotation speed command unit 23 for commanding the initial rotation speed to the inverter compressor 10 is provided. The initial rotation speed commanded by the initial rotation speed command unit 23 is the same as the steady rotation speed.
It is input from the rotation speed changing unit 21.

The rotation speed changing unit 21 operates in the same manner as the normal rotation speed change described above, and according to the number of operating evaporators, refers to the change pattern table 18 and refers to the change pattern table 18.
(N1, N2, or N3) is set as the number of revolutions (initial number of revolutions) at the time of startup. Also, instead of only the number of operating evaporators,
The number of revolutions (initial number of revolutions) N (N4 to N) of the inverter compressor 10 when the inverter compressor 10 starts up is referred to in accordance with the change pattern according to the stop time of the inverter compressor 10 and the number of operating evaporators.
18) may be set. Note that N1> N3, N4> N
8> N18 and N4>N14> N18. Further, the initial rotation speed may be set not only when the inverter compressor 10 is started but also when the number of operating evaporators changes as shown in Table 20.

[0080]

[Table 18]

[0081]

[Table 19]

[0082]

[Table 20]

As shown in Table 21, the initial rotation speed N of the inverter compressor 10 may be set according to the outside air temperature and the number of operating evaporators. When the number changes, it may be set again. Similarly, as shown in Table 23, the initial rotation speed N of the inverter compressor 10 may be set in accordance with the four seasons information and the number of operating evaporators. When it changes, it may be set again. In addition, the initial rotation speed N may be determined according to the outer surface temperature of the vending machine, the temperature of the suction air sucked into the condenser 5, and the number of operating evaporators.
May be set.

[0084]

[Table 21]

[0085]

[Table 22]

[0086]

[Table 23]

[0087]

[Table 24]

Next, the operation of the compressor control device of this embodiment will be described with reference to the flowchart of FIG. First, the system waits for a start command from the controller 9 to the inverter compressor 10 (step 1 (S1)).
When the start command is output, the rotation speed changing unit 21 reads the operation mode (S2), and then reads the number of operating evaporators 3 (S3).

Next, the rotation speed changing unit 21 reads the initial rotation speed corresponding to the read operation evaporator number with reference to Table 18 (S4), and uses this initial rotation speed as the rotation speed command unit 2.
Output to 2. Rotation speed command unit 2 to which the initial rotation speed is input
In 2, the initial rotation speed command unit 23 instructs the inverter compressor 10 of the initial rotation speed (S 5), and the inverter compressor 10 rotates at the specified initial rotation speed.

At this time, the initial rotational speed of the inverter compressor 10 is a rotational speed set according to the number of operating evaporators 3 which affects the load. At the time of start-up before shifting to the steady operation, which is a typical operation, the operation is performed while appropriately maintaining the balance between the load and the cooling capacity. If the number of operating evaporators changes during the initial rotation of the inverter compressor 10 at the initial rotation speed, the load fluctuates.
9, the initial rotation speed may be changed.

Further, the rotation speed changing unit 21 reads the rotation speed changing time according to the read operation mode and the number of operation evaporators with reference to Table 1 (S6), and responds according to the determination result in Table 4. The rotation speed of the change pattern
Reading is performed with reference to Table 5 and Tables 6 to 17 (S7).
The rotation speed change unit 21 waits for the rotation speed change time read in step 6 (S6) to elapse (S8), and after the rotation speed change time elapses, sends the read rotation speed to the rotation speed command unit 22.
The rotation speed command section 22 commands the input rotation speed to the inverter compressor 10 (S9), and the inverter compressor 10 is shifted from the initial rotation speed to the specified rotation speed.

At this time, the rotation speed of the inverter compressor 10 is a rotation speed set in accordance with the number of operating evaporators 3 and the stopping time of the inverter compressor 10 which is an environmental factor. The machine 10 is operated while appropriately maintaining the balance between the load and the cooling capacity.

It is monitored whether or not the number of operating evaporators has changed during the operation of the inverter compressor 10 (S10). If the number has changed, the load fluctuates. Returning to the mode reading process, if the number of operating evaporators has not changed, the inverter compressor 10
It is monitored whether or not has stopped (S11). If the inverter compressor 10 stops, return to start,
If the inverter compressor 10 has not stopped, the process returns to step 6 (S6), which waits for the rotation speed change time to elapse.

As described above, according to the compressor control device of the present embodiment, the rotation speed changing unit 21 determines the load and the cooling capacity as the time elapses from the start of the start of the inverter compressor 10. The rotational speed changed according to the rotational speed change pattern experimentally obtained in advance so that the balance becomes appropriate is output to the rotational speed command unit 22, and the rotational speed command unit 22 converts the input rotational speed into an inverter. By instructing the compressor 10, the inverter compressor 10 can perform an operation in which the load and the cooling capacity are appropriately balanced.
In addition, when the internal temperature or the like or the temperature gradient deviates from the preset range, the rotation speed changing unit 21 is suitable for returning the internal temperature or the temperature gradient to a desired range (Tables 2 and 3). The rotation speed change unit 21 receives the rotation speed change pattern from the rotation speed change unit 21 in order to select the rotation speed change pattern from the plurality of types of change patterns and output the rotation speed according to the selected change pattern. By instructing the inverter compressor 10 of the rotation speed, the rotation speed of the inverter compressor 10 can be adjusted such that the temperature in the refrigerator or the temperature gradient falls within a predetermined range while optimizing the balance between the load and the cooling capacity. You can drive with

At this time, the change patterns are environmental factors such as an operation mode corresponding to the number of the product rooms 1 to be cooled, the number of evaporators 3 being operated, a stop time of the inverter compressor 10, an outside air temperature, Since it is set based on the four seasons information or the like, or a combination thereof, the inverter compressor 10 can be operated under the environment affected by these factors.
The operation can be performed while appropriately maintaining the balance between the load and the cooling capacity.

Further, the rotation speed command unit 22 is provided with an initial rotation speed command unit 23 for exclusively commanding the initial rotation speed to the inverter compressor during the initial operation. Can be accurately separated, and the controllability can be improved.

In the above embodiment, “change 1” in the change pattern of the rotation speed read by the rotation speed change unit 21 is changed by the change amount of the rotation speed as shown in Tables 5 and 6 described above. Instead of being set by Δ1N, it may be set by the changed rotational speed N itself. That is, “change 1” may be set by a change pattern representing a new rotation speed as shown in Table 25.

[0098]

[Table 25]

The change pattern of the rotation speed corresponding to the “change 1” is, for example, a change pattern that defines the changed rotation speed according to the operation stop time of the inverter compressor 10 and the number of rotation speed change commands. (Table 26), a change pattern (Table 27) that defines the number of rotations after the change according to the outside air temperature and the number of rotations change command, and the rotation after the change according to the four seasons information and the number of rotations change command. A change pattern defining the number (Table 28) or the like can be applied.

[0100]

[Table 26]

[0101]

[Table 27]

[0102]

[Table 28]

In the above-described embodiment, the rotation speed change time is the same as that in the first rotation speed change and the second and subsequent rotation speed changes as long as the operation mode and the number of operation evaporators are the same. Since the time intervals are the same (see Table 1), the number of changes in the rotational speed is proportional to the time elapsed from the start of the operation of the inverter compressor 10 (discrete proportionality). When a long time has elapsed since the start of startup, the degree of balance of the cooling capacity with respect to the load is higher than that when only a short time has elapsed since the start of the startup, and fluctuations in the internal temperature may be smaller. It is conceivable that the speed does not need to be changed frequently.

Therefore, it is sometimes desirable from the viewpoint of energy saving to change the rotation speed according to a change pattern in which the interval of the rotation speed change time is changed according to the length of the elapsed time. As shown in FIG. 31, the rotation speed change time intervals (tk0 to tk1, tk1 to tk2, tk)
2 to tk3, tk3 to tk4, tk4 to tk5, tk5
To tk6, tk6 to tk7), the elapsed time (tk0 to tk1 to tk2 to tk3 to tk4 to tk5)
tk6 to tk7) and the compressor stop time (Table 2).
9) According to the elapsed time and the outside air temperature (Table 30), or according to the elapsed time and the four seasons information (Table 31), a change pattern in which the changed number of revolutions is set may be applied.

[0105]

[Table 29]

[0106]

[Table 30]

[0107]

[Table 31]

[0108]

As described above, according to the compressor control device of the present invention (claim 1), the rotation speed changing unit loads the load as the time elapses from the start of the inverter compressor. The rotation speed changed in accordance with the rotation speed change pattern experimentally obtained in advance so that the balance between the rotation speed and the cooling capacity becomes appropriate is output to the rotation speed command unit. By instructing the number to the inverter compressor, the inverter compressor can perform an operation in which the load and the cooling capacity are appropriately balanced.

Further, according to the compressor control device of the present invention (claim 2), the inside temperature of the vending machine detected by the inside temperature detecting means and / or the inside temperature with respect to the elapsed time. When the temperature gradient deviates from the preset range, the rotation speed changing unit changes the rotation speed change pattern suitable for returning the in-chamber temperature or the temperature gradient to a desired range, by changing the rotation speed of a plurality of types of change patterns. The rotation speed command section instructs the inverter compressor to input the rotation speed input from the rotation speed change section to the inverter compressor to output the rotation speed according to the selected change pattern. Can be operated at a rotation speed such that the temperature in the refrigerator or the temperature gradient falls within a preset range while optimizing the balance between the load and the cooling capacity.

Further, according to the compressor control device of the present invention (claim 3), the change pattern is operating in an operation mode corresponding to the number of the product rooms to be cooled, which is an environmental factor. Number of evaporators, stop time of the inverter compressor, ambient temperature outside the vending machine, temperature of the outer surface of the vending machine, temperature of suction air sucked into the condenser, or seasonal information, or Since the setting is based on these combinations, the inverter compressor can be operated while appropriately maintaining the balance between the load and the cooling capacity even in an environment affected by these factors.

Further, according to the compressor control device of the present invention (claim 4), the rotation speed command unit is configured to provide the initial rotation speed command for exclusively commanding the initial rotation speed to the inverter compressor that is initially operating. By providing the unit, the control of the initial operation and the control of the steady operation can be accurately separated, and the easiness of the control can be improved.

Further, according to the compressor control device of the present invention (claim 5), the rotational speed command section is configured to provide the initial rotational speed command for exclusively commanding the initial rotational speed to the inverter compressor that is in the initial operation. By providing the unit, the control of the initial operation and the control of the steady operation can be accurately separated, and the easiness of the control can be improved.

According to the compressor control device of the present invention (claim 6), the operation mode and the operation mode according to the number of the product rooms to be cooled, which are environmental factors, are also determined for the initial rotation speed. The number of evaporators that are in operation, the stop time of the inverter compressor, the ambient temperature outside the vending machine, the temperature of the outer surface of the vending machine, the temperature of suction air sucked into the condenser, or four seasons information. , Or a combination of these, so that in the environment affected by these factors, the initial operation of the inverter compressor can also be performed while maintaining a proper balance between load and cooling capacity. can do.

Further, according to the compressor control method of the present invention (claim 7), the load and the cooling capacity can be properly balanced as time elapses from the start of the inverter compressor. By instructing the inverter compressor to change the rotational speed in accordance with the rotational speed change pattern experimentally obtained in advance, the inverter compressor can perform an operation in which the load and the cooling capacity are appropriately balanced. .

According to the compressor control method of the present invention (claim 8), the detected internal temperature of the vending machine and / or the temperature gradient of the internal temperature with respect to the elapsed time are preset. When the temperature is out of the range, a change pattern of the rotation speed suitable for returning the temperature in the refrigerator or the temperature gradient to a desired range is selected from a plurality of types of change patterns, and the selected change pattern is selected. By outputting the rotation speed in accordance with the rotation speed and instructing the rotation speed to the inverter compressor, the temperature of the inside of the refrigerator and the temperature gradient are set in a predetermined range while optimizing the balance between the load and the cooling capacity. It can be operated at such a rotation speed.

Further, according to the compressor control method of the present invention (claim 9), the change pattern is an operation mode or operation mode corresponding to the number of the product rooms to be cooled, which is an environmental factor. Number of evaporators, stop time of the inverter compressor, ambient temperature outside the vending machine, temperature of the outer surface of the vending machine, temperature of suction air sucked into the condenser, or seasonal information, or Since the setting is based on these combinations, the inverter compressor can be operated while appropriately maintaining the balance between the load and the cooling capacity even in an environment affected by these factors.

Further, according to the compressor control method of the present invention (claim 10), from the start of the inverter compressor to the predetermined elapsed time or after the number of operating evaporators changes. By instructing the initial rotation speed to the inverter compressor during the initial operation until a predetermined elapsed time, the control of the initial operation and the control of the steady operation can be accurately separated, and the easiness of control is improved. Can be done.

Further, according to the compressor control method of the present invention (claim 11), the temperature of the inside of the vending machine or the temperature of the commodities stored in the vending machine is changed from the start of the start of the inverter compressor. Initially, until the temperature reaches a predetermined temperature or after the number of operating evaporators changes, until the temperature inside the vending machine or the temperature of the goods stored in the vending machine reaches the predetermined temperature. By providing an initial rotation speed command unit for commanding the initial rotation speed to the running inverter compressor, control of the initial operation and control of the steady operation can be accurately separated, and the easiness of the control is improved. be able to.

According to the compressor control method of the present invention (claim 12), the operation mode and the operation mode according to the number of the product rooms to be cooled, which are environmental factors, are also set for the initial rotation speed. The number of evaporators that are in use, the stop time of the inverter compressor, the ambient temperature outside the vending machine, the temperature of the outer surface of the vending machine, the temperature of the suction air sucked into the condenser, or four seasons information. , Or a combination of these, so that in the environment affected by these factors, the initial operation of the inverter compressor can also be performed while maintaining a proper balance between load and cooling capacity. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control device for an inverter compressor according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a vending machine.

FIG. 3 is a block diagram showing an input / output relationship of a controller.

FIG. 4 is a flowchart showing a process of the control device for the inverter compressor according to the embodiment of the present invention.

FIG. 5 is a diagram showing an example of a change pattern of the number of revolutions by “change 1”.

FIG. 6 is a diagram showing a vending machine controlled by a conventional compressor control method.

FIG. 7 is a diagram showing an input / output relationship of a controller according to a conventional compressor control device.

FIG. 8 is a block diagram showing a conventional compressor control device.

FIG. 9 is a flowchart showing processing of a conventional compressor control device.

FIG. 10 is a timing chart of control in a conventional compressor control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commodity room 1a Left room 1b Middle room 1c Right room 2 Machine room 3 Evaporator 4 In-chamber temperature sensor 5 Condenser 7 Solenoid valve 8 Capillary tube 9 Controller 10 Inverter compressor 11 Inverter 21 Revolution change part 22 Revolution command part 23 Initial rotation speed command section

Continuation of the front page (72) Inventor Naoki Inoshi 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. F-term (reference) in Denki Co., Ltd.

Claims (12)

[Claims] An apparatus for controlling a compressor in a vending machine, comprising: a cooling unit having at least an evaporator, a condenser, an expansion mechanism, and a compressor; and a controller that controls the cooling unit. An inverter compressor, wherein the controller changes the rotation speed commanded to the inverter compressor according to a predetermined change pattern and outputs the rotation speed in accordance with a lapse of time from the start of activation of the inverter compressor. A control device for a compressor, comprising: a change unit; and a rotation speed command unit that instructs the inverter compressor of a rotation speed output from the rotation speed change unit. 2. An internal temperature detecting means for detecting an internal temperature of the vending machine and / or a temperature gradient of the internal temperature with respect to the elapsed time, wherein the rotation speed changing unit includes a plurality of types different from each other. And when the inside temperature and / or the temperature gradient detected by the inside temperature detection means deviate from a preset range, a corresponding one of the plurality of types of change patterns is provided. The compressor control device according to claim 1, wherein a change pattern is selected, and the number of revolutions changed according to the selected change pattern is output. 3. The change pattern includes an operation mode corresponding to the number of the commodity rooms to be cooled, a number of evaporators being operated, a stop time of the inverter compressor, and an ambient temperature outside the vending machine. The temperature of the outer surface of the vending machine,
The compressor control device according to claim 1 or 2, wherein the control device is set based on at least one of a temperature of intake air sucked into the condenser and four seasons information. 4. The rotation speed command unit according to claim 1, wherein a predetermined time has elapsed since the start of the inverter compressor, or a predetermined time has elapsed since the number of operating evaporators changed.
4. An inverter rotation speed command unit for commanding an initial rotation speed to the inverter compressor.
The control device for a compressor according to any one of the above. 5. The rotation speed command section, from the start of the start of the inverter compressor, until the temperature in the refrigerator of the vending machine or the temperature of a product stored in the vending machine reaches a predetermined temperature, or After the number of operating evaporators changes, the inverter compressor is initialized until the internal temperature of the vending machine or the temperature of a product stored in the vending machine reaches a predetermined temperature. 2. The apparatus according to claim 1, further comprising an initial rotation speed command unit for commanding the rotation speed.
4. The control device for a compressor according to any one of the first to third aspects. 6. The operating mode according to the number of the commodity rooms to be cooled, the number of operating evaporators,
The stop time of the inverter compressor, the ambient temperature outside the vending machine, the temperature of the outer surface of the vending machine, the temperature of the suction air sucked into the condenser, and at least one of season information. The control device for a compressor according to claim 4, wherein the control device is set based on the control information. 7. A method of controlling a compressor in a vending machine including a cooling unit having at least an evaporator, a condenser, an expansion mechanism, and a compressor, and a controller for controlling the cooling unit, wherein the compressor is An inverter compressor, wherein the controller changes the rotation speed commanded to the inverter compressor according to a predetermined change pattern and outputs the rotation speed in accordance with the elapse of time from the start of the inverter compressor. A method for controlling a compressor, comprising: commanding the output rotation speed to the inverter compressor. 8. A temperature inside the refrigerator of the vending machine and / or a temperature gradient of the temperature inside the refrigerator with respect to the elapsed time is detected, and the detected temperature inside the refrigerator and / or the temperature gradient is set in advance. When the value is out of the range, a corresponding change pattern is selected from a plurality of different types of change patterns prepared in advance, and the number of revolutions changed according to the selected change pattern is output. The method for controlling a compressor according to claim 7, wherein 9. The change pattern includes an operation mode corresponding to the number of the commodity rooms to be cooled, a number of evaporators being operated, a stop time of the inverter compressor, and an ambient temperature outside the vending machine. The temperature of the outer surface of the vending machine,
9. The control method for a compressor according to claim 7, wherein the control method is set based on at least one of a temperature of intake air sucked into the condenser and season information. 10. An initial rotation speed of the inverter compressor until a predetermined elapsed time from the start of the start of the inverter compressor or until a predetermined elapsed time after the number of operating evaporators changes. 10. The method for controlling a compressor according to any one of claims 7 to 9, wherein 11. The operation of the evaporator from the start of the operation of the inverter compressor until the temperature in the refrigerator of the vending machine or the temperature of a product stored in the vending machine reaches a predetermined temperature, or Commanding an initial rotation speed to the inverter compressor until the internal temperature of the vending machine or the temperature of the product stored in the vending machine reaches a predetermined temperature after the number changes. The method for controlling a compressor according to any one of claims 7 to 9, wherein: 12. The initial rotation speed includes an operation mode corresponding to the number of the commodity rooms to be cooled, the number of operating evaporators, a stop time of the inverter compressor, and an atmosphere outside the vending machine. Temperature, the temperature of the outer surface of the vending machine,
The compressor control method according to claim 10 or 11, wherein the control method is set based on at least one of a temperature of intake air sucked into the condenser and season information.