RU2484390C1 - Conditioner - Google Patents

Abstract

FIELD: ventilation.

SUBSTANCE: conditioner (1) uses a refrigerating cycle, which comprises a compressor (21) and a tube (F) for refrigerating fluid, the external periphery of which comprises a magnetic tube (F2), besides, the conditioner (1) comprises a winding (68), a pressure sensor (29a) and a control unit (11). The winding (68) generates magnetic field for induction heating of the magnetic tube (F2). The pressure sensor (29a) identifies refrigerating fluid pressure at the side of high pressure of at least a part of the refrigerating cycle. When the refrigerating cycle performs the process of air heating, the control unit (11) starts a condition, in which generation of magnetic field with the winding (68) happens at maximum supplied power (Mmax) from the moment of time, when frequency of a compressor (21) is equal to or is higher than the specified minimum frequency (Qmin), and the control unit (11) performs this condition until the pressure defined by the pressure sensor (29a) achieves the target high pressure (Ph). Further from the moment of time, when the target high pressure has been achieved, the process is carried out with limitation, since the stable supplied power (M2), which is lower than the maximum supplied power (Mmax) is the upper limit of the output signal.

EFFECT: using the invention makes it possible to ensure characteristics during start-up and to maintain deviation after start at the minimum.

11 cl, 26 dwg

Description

FIELD OF THE INVENTION

The present invention relates to an air conditioner.

BACKGROUND OF THE INVENTION

Among the air conditioners providing the process of heating the air, air conditioners have been proposed that include a function of heating the refrigerant, designed to increase the ability to heat the air.

For example, in an air conditioner disclosed in Patent Literature 1 below (Japanese Patent Application Laid-Open No. 2009-97510), the ability to heat air is enhanced by the refrigerant passing into the refrigerant heating apparatus and heated by the gas burner.

The air conditioner disclosed in Patent Literature 1 (Japanese Patent Application Laid-open No. 2009-97510) proposes a method in which the burner speed of a gas burner is controlled based on a determination value of a thermistor to prevent too high a temperature of the refrigerant and too often carry out a protective action during the process of heating the air.

SUMMARY OF THE INVENTION

<Technical Problem>

In the method disclosed in the aforementioned Patent Document 1, only the frequency of the protective action is reduced, and control is not proposed to account for the load difference between the start and after the start.

For example, in some cases there is a big difference between the ambient temperature and the set temperature when starting the air conditioner, and it is desirable that the set temperature is quickly reached, while there is also a load difference during start-up and after start-up, in which case there is a risk of deviation at which the target value is too exceeded.

When the system for heating the refrigerant is an electromagnetic induction heating system, the aforementioned deviation is in particular likely a problem due to the high heating rate.

The present invention was conceived in the light of the circumstances described above, and its purpose is to provide an air conditioner capable of quickly providing operation upon startup and maintaining deviation after startup at a minimum.

<Problem Solving>

An air conditioner in accordance with a first aspect is an air conditioner that uses a refrigeration cycle including a compression mechanism for circulating a refrigerant, a refrigerant pipe that establishes thermal contact with a refrigerant passing through the refrigerant pipe, and / or a heat generating unit that establishes thermal contact with the refrigerant passing through the refrigerant pipe, the conditioner comprising a magnetic field generator, a detector of a state parameter of the refrigerant, and a control unit. The heat generating element generates a magnetic field for induction heating of the portion to be heated by induction heating. The refrigerant state parameter detector determines a state parameter related to the refrigerant passing through a predetermined portion to determine a state parameter that is at least part of the refrigeration cycle. The state parameter in this example includes at least one of, for example, temperature and pressure. The control unit controls the generation of the magnetic field at startup and controls the generation of the magnetic field after startup. When controlling the generation of the magnetic field at start-up, during the start-up, which includes the process of heating the air in the refrigeration cycle, the control unit starts a state in which the output signal of the magnetic field generator is the specified maximum output signal from the time when it is assumed that the compression mechanism is in the actuation state, and ends this state when the state parameter determined by the detector of the state parameter of the refrigerant reaches the first target state parameter. In controlling the magnetic field generation after start-up after the completion of the magnetic field generation control at start-up, the control unit implements a restriction application state in which a first limit control value of the magnetic field smaller than a predetermined maximum output signal is an upper limit of the output signal of the magnetic field generator. The phrase “when the refrigeration cycle carries out the process of heating the air” does not include processes such as the defrosting process. Heating by means of an electromagnetic induction heating device here includes at least, for example, electromagnetic induction heating of an element for generating heat in thermal contact with a refrigerant pipe, electromagnetic induction heating of an element for generating heat in thermal contact with a refrigerant passing through a pipe for refrigerant, and electromagnetic induction heating of the element to generate heat, comprising at least part of the refrigeration cycle.

In the air conditioner in accordance with the aspect described above, by controlling the generation of the magnetic field at startup, so that the output of the magnetic field generator at startup reaches its maximum, the time required to heat the air, which must be provided to the user after the start of the process heating air can be reduced. In addition, the control deviation due to the output of the magnetic field generator, which is too large during the control of the magnetic field generation after start-up, can be minimized. In this way, control deviation can be minimized, while the supply of heated air to the user quickly starts.

An air conditioner in accordance with a second aspect is an air conditioner of the first aspect, wherein the portion heated by induction heating includes magnetic material.

In an air conditioner, in accordance with the aspect described above, since the magnetic field generator generates a magnetic field using a portion containing the magnetic material as a target, heat generation due to electromagnetic induction can be efficiently performed.

An air conditioner in accordance with a third aspect is an air conditioner of the first or second aspect, wherein a predetermined portion for determining a state parameter is a portion in which a magnetic field is generated by a magnetic field generator.

In an air conditioner in accordance with the aspect described above, since rapid changes in temperature caused by electromagnetic induction heating can be determined, the control sensitivity can be increased.

An air conditioner in accordance with a fourth aspect is an air conditioner according to any one of the first to third aspects, wherein the state parameter determined by the detector of the state parameter of the refrigerant includes at least either temperature or pressure related to the refrigerant passing through a predetermined portion for determining state parameter.

In an air conditioner in accordance with the aspect described above, various sensors used to control the state of the refrigeration cycle can be used here to make determinations.

An air conditioner in accordance with a fifth aspect is an air conditioner according to any one of the first to fourth aspects, wherein the refrigerant state parameter detector is a temperature detector for determining a temperature related to a refrigerant passing through a predetermined portion for determining a state parameter. When controlling the generation of the magnetic field after start-up, the control unit performs proportional-integral regulation for proportionally-integral regulation of the magnitude or frequency related to the output signal of the magnetic field generator, so that the temperature detected by the temperature detector is maintained at the target maintenance temperature. The maintenance target temperature may be the same temperature as the first predetermined target temperature.

In an air conditioner in accordance with the aspect described above, temperature changes caused by electromagnetic induction heating are usually more abrupt than temperature changes due to changes in the state of the refrigerant passing through a predetermined portion to determine a state parameter. Even when the temperature changes dramatically due to electromagnetic induction heating in this way, the temperature determined by the temperature detector can be stabilized at a second predetermined target temperature due to proportional-integral control of the magnitude of the magnetic field generated by the magnetic field generator and / or the frequency at which the magnetic field generator generates a magnetic field.

An air conditioner in accordance with a sixth aspect is an air conditioner according to any one of the first to fifth aspects, wherein the refrigerant state parameter detector is a temperature detector for detecting a temperature related to a refrigerant passing through a predetermined portion for determining a state parameter. The control unit controls the generation of the magnetic field at startup after the condition for increasing the level of the magnetic field is satisfied. This condition for increasing the level of the magnetic field is a condition under which a change in the temperature determined by the temperature detector occurs, or a condition under which the temperature detector determines a temperature change due to a process of changing the level of the magnetic field, carried out to increase or decrease the level of the magnetic field generated by the magnetic field generator The range is below the specified maximum output.

When the temperature detector is not able to detect a temperature change, even if electromagnetic induction heating has been carried out, there is a danger that the fixing state of the temperature detector becomes unstable or is disconnected.

As a protection against this, in the air conditioner in accordance with the aspect described above, when the fixing state of the temperature detector becomes unstable or the temperature detector is disconnected, the temperature change is insufficient and the condition for increasing the magnetic field level is not satisfied. Therefore, the control unit limits the generation of the magnetic field to a level lower than the predetermined maximum output signal, and does not generate the magnetic field at a high level, and therefore, the reliability of the device can be improved. Under the condition of increasing the magnetic field level, it can be determined that the portion to be heated by induction heating generates heat due to the generation of the magnetic field by the magnetic field generator, the temperature detector installation state is satisfactory, and the temperature of the target portion for heating due to induction heating is successful and exactly confirmed. Thus, it is possible to prevent damage to the devices caused by excessive temperature rises due to electromagnetic induction heating, and to increase the reliability of the devices.

An air conditioner in accordance with a seventh aspect is an air conditioner of a sixth aspect, in which a maximum level of a magnetic field generated in a process of changing a level of a magnetic field is a value smaller than a first limit reference value of a magnetic field.

In an air conditioner in accordance with the aspect described above, it is possible to prevent electromagnetic induction heating caused by a magnetic field of magnitude approximately equal to the first limit control value of the magnetic field in stages in which the fixing state of the temperature detector is not yet confirmed to be satisfactory.

An air conditioner in accordance with an eighth aspect is an air conditioner according to any one of the first to seventh aspects, wherein the refrigerant state parameter detector is a temperature detector for detecting a temperature related to a refrigerant passing through a predetermined portion for determining a state parameter. The control unit determines the conditions for increasing the level of the magnetic field after fulfilling the flow condition. The flow condition is a condition under which a temperature change occurs, measured by the temperature detector between the first state of the compression mechanism and the second state of the compression mechanism, when the compression mechanism forcibly performs two states of the compression mechanism of different output signals of the compression mechanism, one of which is the first state of the compression mechanism, and the other is the second state of the compression mechanism with a higher level of output signal than rvoe state of the compression mechanism. The state in which the compression mechanism is turned off is included in the first state of the compression mechanism.

In an air conditioner in accordance with the aspect described above, there is a danger that the refrigerant flow is insufficient when the flow condition is not satisfied, and there is a risk of causing an excessive temperature rise even in the case of the output signal of the magnetic field generator at a level for determining a condition for increasing the magnetic field level . As a protection against this, in the air conditioner in accordance with the aspect described above, since the condition for increasing the level of the magnetic field can be determined by providing a flow of refrigerant passing through a predetermined portion to determine the state parameter, a determination of the condition for increasing the level of the magnetic field can be made while maintaining device reliability.

An air conditioner in accordance with a ninth aspect is an air conditioner according to any one of the first to eighth aspects, wherein the refrigerant state parameter detector is a temperature detector for detecting a temperature related to a refrigerant passing through a predetermined state parameter determination portion. The control unit controls the output signal of the defrosting process to control the output signal of the magnetic field generator based on the temperature determined by the temperature detector, the upper limit of the output signal of the magnetic field generator being the specified maximum output signal when the refrigeration cycle performs a defrosting process different from the process of heating the air, after the start of controlling the generation of the magnetic field after starting.

In an air conditioner in accordance with the aspect described above, since the output signal of the magnetic field generator can be increased similarly with respect to controlling the generation of the magnetic field at startup, the defrosting process can be accelerated.

An air conditioner in accordance with a tenth aspect is an air conditioner of the ninth aspect, in which during control of the output signal during the defrosting process, the control unit performs proportional-integral defrost control, in which the proportional-integral control is such that the temperature detected by the temperature detector is maintained during the second a predetermined target temperature that is lower than a first predetermined target temperature.

In an air conditioner in accordance with the aspect described above, since excessive temperature rises do not occur rapidly during the defrosting process compared to when the magnetic field generation is controlled at startup, the deflection during the defrosting process can be reduced by using the temperature measured by the detector temperature, as the second predetermined target temperature, which is lower than the first predetermined target temperature for controlling the generation of the magnetic field at startup.

An air conditioner in accordance with an eleventh aspect is an air conditioner of any one of the first to tenth aspects, wherein the refrigerant state parameter detector is a temperature detector for determining a temperature related to a refrigerant passing through a predetermined portion for determining a state parameter. The air conditioner further comprises an elastic element for applying elastic force to the temperature detector. The temperature detector is pressed to a predetermined area to determine the state parameter using the elastic force of the elastic element.

In an air conditioner, in accordance with the aspect described above, sharp increases in temperature during electromagnetic induction heating usually occur more rapidly than temperature increases caused by changes in the refrigerant circulation condition in the refrigeration cycle.

As a protection against this, in the air conditioner in accordance with the aspect described above, since the temperature detector is held pressed to a predetermined portion to determine a state parameter with an elastic element, the sensitivity of the temperature detector can be increased. Thus, control with increased sensitivity can be carried out.

<Favorable Results of the Invention>

In the air conditioner in accordance with the first aspect, the control deviation can be kept to a minimum, while the hot air supply to the user starts quickly.

In an air conditioner in accordance with a second aspect, heat generation due to electromagnetic induction can be performed efficiently.

In an air conditioner in accordance with a third aspect, the control sensitivity can be increased.

In an air conditioner in accordance with a fourth aspect, various sensors used to control the state of a refrigeration cycle can be used here to make determinations.

In an air conditioner in accordance with a fifth aspect, the temperature measured by the temperature detector can be stabilized at a second predetermined target temperature.

In an air conditioner in accordance with a sixth aspect, damage to devices caused by excessive temperature increase due to electromagnetic induction heating can be prevented, and the reliability of the devices can be improved.

In an air conditioner in accordance with a seventh aspect, electromagnetic induction heating caused by a magnetic field can be prevented at approximately the first limit control value of the magnetic field in stages in which the fixing state of the temperature detector is not yet satisfactory.

In the air conditioner in accordance with the eighth aspect, the determination of the conditions for increasing the magnetic field level can be carried out, while the reliability of the devices is maintained.

In an air conditioner, in accordance with a ninth aspect, the defrosting process can be accelerated.

In an air conditioner in accordance with a tenth aspect, the deflection during the defrosting process can be reduced.

In an air conditioner, in accordance with an eleventh aspect, high sensitivity control may be performed.

Brief Description of the Drawings

1 is a diagram of a refrigerant circuit of an air conditioner in accordance with an embodiment of the present invention.

Figure 2 is an external perspective view including the front side of the external node.

Figure 3 is a perspective view of the internal device and the configuration of the external node.

Figure 4 is an external perspective view including the rear side of the internal device and the configuration of the outdoor unit.

5 is a General perspective front view showing the internal structure of the machine chamber of the outdoor unit.

6 is a perspective view showing an internal structure of a machine chamber of an outdoor device.

7 is a perspective view of the bottom plate and the outdoor heat exchanger of the outdoor unit.

Fig. 8 is a plan view showing the air injection mechanism of the external assembly.

Fig.9 is a top view showing the relative position between the lower plate of the outer node and the bypass circuit of hot gas.

Figure 10 is an external perspective view of an electromagnetic induction heating device.

11 is an external perspective view showing a state in which the protective cover is removed from the electromagnetic induction heating device.

12 is an external perspective view of an electromagnetic induction thermistor.

13 is an external perspective view of a fuse.

Fig. 14 is a schematic sectional view showing a fixed state of an electromagnetic induction thermistor and a fuse.

15 is a sectional view of the structure of an electromagnetic induction heating device.

16 is a view showing a timing diagram of controlling electromagnetic induction heating.

17 is a view showing a flowchart of a process for evaluating a flow condition.

Fig. 18 is a view showing a flowchart of a process for determining a sensor compartment.

19 is a view showing a flowchart of a process for rapidly increasing pressure.

20 is a view showing a flowchart of a stable output process.

21 is a view showing a flow chart of a defrosting process.

FIG. 22 is a view showing a fixed position of an electromagnetic induction thermistor in accordance with another embodiment (A) of implementation.

23 is an explanatory view of a refrigerant pipe of another embodiment (F).

24 is an explanatory view of a refrigerant tube of another embodiment (G).

25 is a view showing an example of arrangement of windings and a refrigerant pipe of another embodiment (H).

FIG. 26 is a view showing an example of arrangement of coil covers of another embodiment (H). FIG.

Fig. 27 is a view showing an example of the arrangement of ferrite shells of another embodiment (H).

Description of Embodiments

An air conditioner 1 comprising an electromagnetic induction heating device 6 in one embodiment of the present invention is described in the example below with reference to the drawings.

<1-1> Air conditioning 1

1 is a schematic diagram of a refrigerant circuit showing a refrigerant circuit 10 of an air conditioner 1.

In the air conditioner 1, the external unit 2 as a device on the side of the heat source and the internal unit 4 as a device on the side of use are connected by means of refrigerant pipes, and air conditioning is carried out in the space in which the device is located on the side of use, and the air conditioner 1 comprises a compressor 21, four-way switching valve 22, external heat exchanger 23, external electric expansion valve 24, accumulator 25, external fans 26, internal heat exchanger 41, internal fan 42, hot gas bypass valve 27, capillary tube 28, electromagnetic induction heating device 6 and other elements.

Compressor 21, four-way switching valve 22, external heat exchanger 23, external electric expansion valve 24, accumulator 25, external fans 26, hot gas bypass valve 27, capillary tube 28 and electromagnetic induction heating device 6 are located in the outdoor unit 2. Internal heat exchanger 41 and the internal fan 42 is located in the internal node 4.

The refrigerant circuit 10 contains an exhaust pipe A, a gas pipe B on the inside, a liquid pipe C on the inside, a liquid pipe D on the outside, a gas pipe E on the outside, a storage pipe F, an inlet pipe G, an overflow circuit H for hot gas, branch pipe K and pipe J with narrowing. Large volumes of gaseous refrigerant pass through gas pipe B on the inside and gas pipe E on the outside, but the passing refrigerant is not limited to the gaseous refrigerant. Large volumes of refrigerant in the liquid state pass through the fluid pipe C on the inside and the fluid pipe D on the outside, but the passing refrigerant is not limited to the liquid refrigerant.

The exhaust pipe A is connected to the compressor 21 and the four-way switching valve 22.

A gas pipe B on the inner side connects the four-way switching valve 22 and the internal heat exchanger 41. A pressure sensor 29a for measuring the pressure of the passing refrigerant is located at some point along the gas pipe B on the inner side.

A fluid pipe C on the inside connects the internal heat exchanger 41 and the external electric expansion valve 24.

A fluid pipe D on the outside connects the external electrical expansion valve 24 and the external heat exchanger 23.

A gas pipe E on the outside connects the outdoor heat exchanger 23 and the four-way switching valve 22.

The accumulation tube F connects the four-way switching valve 22 and the accumulator 25 and extends vertically when the outdoor unit 2 is installed. An electromagnetic induction heating device 6 is fixed to the part of the accumulation tube F. The heat generating section of the accumulation tube F, the perimeter of which is closed at least winding 68, described below, consists of a copper tube F1 through which refrigerant passes and a magnetic tube F2 located to close the periphery of the copper tube F1 (see FIG. 15). This magnetic tube F2 consists of 430 stainless steel. 430 stainless steel is a ferromagnetic material that generates eddy currents when placed in a magnetic field and which generates heat due to the Joule heat generated by its own electrical resistance. Away from the magnetic tube F2, the tubes forming the refrigerant circuit 10 are composed of copper tubes of the same material as the copper tube F1. The material of the tubes covering the periphery of these copper tubes is not limited to 430 stainless steel and may, for example, be iron, copper, aluminum, chromium, nickel, other conductors, as well as alloys containing at least two or more metals selected from them these listed materials. Possible examples of magnetic material include ferrite, martensite, or a combination thereof, but it is preferable to use a ferromagnetic material that has a relatively high electrical resistance and which has a higher Curie temperature than its temperature range of use. The storage tube F in this document requires more electricity, but may not contain magnetic material and material containing magnetic material, or may include material that will be the target of induction heating. The magnetic material may constitute the entire storage tube F, or may be formed only on the inner surface of the storage tube F, or it may be present only due to inclusion in the material constituting, for example, the storage tube F. By performing electromagnetic induction heating in this way, the storage tube F can heated by electromagnetic induction, and the refrigerant supplied to the compressor 21 through the accumulator 25, can be heated. The heating ability of the air conditioner 1 can thus be improved. Even in cases in which the compressor 21 is not sufficiently heated, for example when starting the air heating process, the lack of starting ability can be compensated for by fast heating with the electromagnetic induction heating device 6. Furthermore, when the four-way switching valve 22 is switched to the state of the air cooling process, and the defrosting process is carried out to remove frost deposited on the outdoor heat exchanger 23 or other elements, the compressor 21 can quickly compress the heated refrigerant due to rapid heating by means of the electromagnetic induction heating device 6 of the storage tube F. Therefore, the temperature of the hot gas leaving the compressor 21 can quickly increase. Thus, the time required to melt the frost through the defrosting process can be reduced. Therefore, even when the defrosting process should be carried out at the right time during the air heating process, the return to the air heating process can be carried out as quickly as possible, and the user comfort can be improved.

The inlet pipe G connects the accumulator 25 and the inlet side of the compressor 21.

A hot gas bypass circuit H connects a branch point A1 located at some point along the outlet pipe A and a branch point D1 located at some point along the liquid pipe D on the outside. At some point in the hot gas bypass circuit H, there is a hot gas bypass valve 27 that can switch between a state of permitting passage of a refrigerant and a state of not permitting passage of a refrigerant. Between the hot gas bypass valve 27 and the branch point D1, the hot gas bypass circuit H comprises a capillary tube 28 to lower the pressure of the passing refrigerant. This capillary tube 28 makes it possible to approximate the pressure that follows the decrease in refrigerant pressure due to the external electric expansion valve 24 during the air heating process and, therefore, makes it possible to prevent the increase in refrigerant pressure in the liquid pipe D on the outside due to the supply of hot gas through the hot gas bypass circuit H to the liquid pipe D on the outside.

The branch pipe K, which forms part of the external heat exchanger 23, consists of a refrigerant pipe extending from the gas inlet / outlet 23e on the gas side of the external heat exchanger 23 and branching into a plurality of pipes at the branch / converge point 23k described below to increase the effective surface area for heat transfer. The branch pipe K comprises a first branch pipe K1, a second branch pipe K2 and a third branch pipe K3, which extend independently of the branch / converge point 23k to the convergence / branch point 23j, and these branch pipes K1, K2, K3 converge at the convergence / 23 point 23j branching. Seen from the side of the tube J with narrowing, the branched tube K branches and extends from the convergence / branch point 23j.

The restriction tube J, which forms part of the external heat exchanger 23, is a tube extending from the convergence / branch point 23j to the inlet / outlet 23d on the liquid side of the external heat exchanger 23. The restriction tube J is able to equalize the degree of subcooling of the refrigerant leaving the external heat exchanger 23 into time of the air cooling process, and is also capable of melting ice deposited in the vicinity of the lower end of the external heat exchanger 23 during the air heating process. The narrowed tube J has a cross-sectional area of approximately three times larger than each of the cross-sectional areas of the branching tubes K1, K2, K3, and the amount of refrigerant passing through is approximately three times larger than the amount of passing refrigerant in each of the branching tubes K1, K2, K3.

The four-way switching valve 22 is capable of switching between the cycle of the air cooling process and the cycle of the air heating process. 1, the state of the connection during the process of heating the air is shown in solid lines, and the state of the connection during the process of cooling of the air is shown in dashed lines. During the process of heating the air, the internal heat exchanger 41 performs the function of a refrigerant cooling device, and the external heat exchanger 23 performs the function of a refrigerant heating device. During the air cooling process, the external heat exchanger 23 performs the function of a refrigerant cooling device, and the internal heat exchanger 41 performs the function of a refrigerant heating device.

The external heat exchanger 23 comprises a gas side inlet / outlet 23e, a liquid side inlet / outlet 23d, a branch / toe point 23k, a toe / branch point 23j, a branch pipe K, a restriction pipe J and heat exchange fins 23z. The gas inlet / outlet 23e is located at the end of the external heat exchanger 23 next to the gas pipe E on the external side and is connected to the gas pipe E on the external side. The liquid side inlet / outlet 23d is located at the end of the external heat exchanger 23 next to the liquid pipe D on the external side and is connected to the liquid pipe D on the external side. The branching / converging point 23k is the point where the pipe extending from the gas inlet / outlet 23e branches out and the refrigerant can be discharged or converged depending on the direction in which the refrigerant passes. The branched tube K extends in the form of a plurality of tubes from each of the branched portions at a branch / toe point 23k. The convergence / branch point 23j is the point at which the branch pipe K converges and the refrigerant can converge or discharge depending on the direction in which the refrigerant passes. The narrowing tube J extends from the convergence / branch point 23j to the fluid inlet / outlet 23d. The heat exchange fins 23z consist of a plurality of aluminum plate fins, rectified in the thickness direction of their plates and spaced apart from each other at a predetermined distance. The branched tube K and the narrowing tube J pass through the heat exchange fins 23z. Specifically, the branched tube K and the narrowing tube J are arranged to extend in the direction of the plate thickness through different parts of the same heat exchange fins 23z. On the windward side of the outdoor fans 26 in the direction of air flow, the outdoor heat exchanger 23 comprises an outdoor temperature sensor 29b for measuring the outdoor temperature. The outdoor heat exchanger 23 also includes an external heat exchange temperature sensor 29c for measuring the temperature of the refrigerant passing through the branch pipe of the air conditioner.

An indoor temperature sensor 43 for measuring indoor temperature is located in the indoor unit 4. The internal heat exchanger 41 also includes an internal heat exchange temperature sensor 44 for measuring a temperature of a refrigerant of a side next to a liquid pipe C on the inner side where an external electrical expansion valve 24 is connected.

The outdoor control unit 12 for controlling devices located in the external unit 2, and the internal control unit 13 for controlling devices located in the internal unit 4, are connected via a communication line 11a, thereby forming a control unit 11. This control unit 11 carries out various controls of the air conditioner 1.

The outdoor control unit 12 also includes a timer 95 for counting the time used during various controls.

The controller 90 for receiving installation input data from the user is connected to the control unit 11.

<1-2> Outdoor unit 2

Figure 2 is an external perspective view of the front side of the outdoor unit 2. Figure 3 is a perspective view showing the relative position between the outdoor heat exchanger 23 and the outdoor fans 26. Figure 4 is a perspective view of the rear side of the outdoor heat exchanger 23.

The outer surfaces of the outer node 2 form essentially the casing of the outer node in the form of a rectangular parallelepiped, which consists of a ceiling plate 2a, a lower plate 2b, a front panel 2c, a left side panel 2d, a right side panel 2f and a rear side panel 2e.

The external unit 2 is divided by a partition 2H into the chamber of the blower fan next to the left side panel 2d, in which the external heat exchanger 23, the outdoor fans 26 and other elements are located, and the machine chamber next to the right side panel 2f, in which the compressor 21 and / or an electromagnetic induction heating device 6. The outdoor unit 2 is fixed in place by screwing on the bottom plate 2b, and the external unit 2 includes a support column 2G forming the left and right sides of the self about the lower end of the outdoor unit 2. An electromagnetic induction heating device 6 is located in the engine chamber in the upper position near the right side panel 2f and the ceiling plate 2a. The heat exchange fins 23z of the outdoor heat exchanger 23 described above are arranged to be straightened in the direction of the plate thickness, while the direction of the plate thickness extends generally horizontally. The narrowing tube J is located in the lowermost parts of the heat transfer ribs 23z of the external heat exchanger 23 by passing through the heat transfer ribs 23z in the thickness direction. The hot gas bypass circuit H is located to pass under the outdoor fans 26 and the outdoor heat exchanger 23.

<1-3> Internal configuration of outdoor unit 2

Figure 5 is a general perspective front view showing the internal structure of the machine chamber of the outdoor unit 2. Figure 6 is a perspective view showing the internal structure of the machine chamber of the outdoor unit 2. Figure 7 is a perspective view showing the relative position between the outdoor heat exchanger 23 and the bottom plate 2b.

The partition 2H divides the outer assembly 2 from front to back from the upper end to the lower end to divide the outer assembly 2 into a pressure fan chamber in which the external heat exchanger 23, external fans 26 and other elements are located, and a machine chamber in which the electromagnetic induction heating device is located 6, compressor 21, drive 25 and other elements. The compressor 21 and the accumulator 25 are located in the space below the machine chamber of the outdoor unit 2. The electromagnetic induction heating device 6, the four-way switching valve 22 and the outdoor control unit 12 are located in the upper space of the machine chamber of the outdoor unit 2, which is also the space on top of the compressor 21, the accumulator 25 and other elements. The functional elements that make up the outdoor unit 2 and are located in the engine chamber, which are the compressor 21, four-way switching valve 22, external heat exchanger 23, external electric expansion valve 24, accumulator 25, hot gas bypass valve 27, capillary tube 28 and electromagnetic induction heating device 6 are connected by an exhaust pipe A, a gas pipe B from the inside, a liquid pipe D from the outside, a gas pipe E from the outside, a storage tube and F, a bypass circuit H of hot gas and other elements, so that the refrigeration cycle is carried out by the refrigerant circuit 10 shown in FIG. The hot gas bypass circuit H is made up of nine connected sections, which are the first bypass section H1 to the ninth bypass section H9, as described below, and when the refrigerant passes through the hot gas bypass circuit H, the refrigerant sequentially passes from the first bypass section H1 to the ninth bypass section H9.

<1-4> Narrow tube J and branched tube K

The narrowing tube J shown in FIG. 7 has a cross-sectional area equal to the cross-sectional areas of the first branched tube K1, the second branched tube K2 and the third branched tube K3, as described above, and inside the outer heat exchanger 23 a portion containing the first branched tube K1, the second branched tube K2 and the third branched tube K3 can be increased in terms of its heat-exchange effective surface area compared to the heat-exchange effective surface area of the tube J with narrowing m. A large amount of refrigerant is collected in the portion of the tube J with constriction and is intensive compared to the portion of the first branched tube K1, the second branched tube K2 and the third branched tube K3, and therefore, ice formation under the outdoor heat exchanger 23 can be more effectively prevented. Tube J with constriction in this document consists of the first section J1 of the tube with constriction, the second section J2 of the tube with constriction, the third section J3 of the tube with constriction and the fourth section J4 of the tube with constriction connected to each other friend, as shown in Fig.7. The refrigerant that has passed to the external heat exchanger 23 through the branch pipe K converges at the convergence / branching point 23j, and in this position, the refrigerant in the refrigerant circuit 10 can pass through the lowermost end of the external heat exchanger 23 after being collected in a single flow. The first section of the narrowing tube J1 extends from the convergence / branching point 23j to the heat exchange fins 23z located at the outermost edge of the outer heat exchanger 23. The second narrowing section of the tube J2 extends from the end of the first narrowing tube section J1 to pass through the plurality of heat exchange fins 23z . As with the second constricted tube portion J2, the fourth constricted tube portion J4 also extends to pass through the plurality of heat exchange fins 23z. The third constricted tube portion J3 is a U-shaped tube that connects the second constricted tube portion J2 and the fourth constricted tube portion J4 at the end of the outdoor heat exchanger 23. During the air cooling process, since the refrigerant flow in the refrigerant circuit 10 is collected from a plurality divided flows in the branch pipe K into one stream in the pipe J with constriction, the refrigerant can be collected in one stream in the pipe J with constriction, even if the degree of supercooling of the refrigerant passing through the branch pipe K in the area just in front of the convergence / branch point 23j, it differs with each installation of the refrigerant passing through the individual tubes forming the branched tube K, and therefore, the degree of subcooling at the outlet of the external heat exchanger 23 can be adjusted. When the defrosting process is carried out during the air heating process, the hot gas bypass valve 27 opens and the high temperature refrigerant leaving the compressor 21 can be supplied to the restriction tube J located at the lower end of the external heat exchanger 23 before being fed to other parts of the external heat exchanger 23. Therefore ice deposited in the lower vicinity of the outdoor heat exchanger 23 can be melted effectively.

<1-5> Hot gas bypass circuit H

Fig. 8 is a top view on which the air injection mechanism of the outdoor unit 2 is removed. Fig. 9 is a top view of the mutual arrangement between the bottom plate of the outdoor unit 2 and the hot gas bypass circuit H.

The hot gas bypass circuit H comprises a first bypass section H1 and an eighth bypass section H8, as shown in FIGS. 8 and 9, as well as a ninth bypass section H9, which is not shown. In the hot gas bypass circuit H, the portion that branches at the branch point A1 from the exhaust pipe A passes to the hot gas bypass valve 27 and further extends from the hot gas bypass valve 27, is the first bypass section H1. The second bypass section H2 extends from the end of the first bypass section H1 towards the chamber of the blower fan near the rear side. The third bypass section H3 extends to the front side from the end of the second bypass section H2. The fourth bypass section H4 extends in the opposite direction of the machine chamber to the left of the end of the third bypass section H3. The fifth bypass section H5 extends to the rear side from the end of the fourth bypass section H4 to the section where a clearance can be provided with the rear side panel 2e of the casing of the outdoor unit. The sixth bypass section H6 extends from the end of the fifth bypass section H5 to the engine chamber on the right and to the rear side. The seventh bypass section H7 extends from the end of the sixth bypass section H6 to the engine chamber on the right and through the interior of the blower fan chamber. The eighth bypass section H8 passes through the interior of the engine chamber from the end of the seventh bypass section H7. The ninth bypass section H9 extends from the end of the eighth bypass section H8 until it reaches the capillary tube 28. When the hot gas bypass valve 27 is opened, refrigerant flows through the hot gas bypass circuit H from the first bypass section H1 to the ninth bypass section H9, as described above. . Therefore, the refrigerant that is discharged at the branch point A1 of the exhaust pipe A passing from the compressor 21 passes to the first bypass section H1 before the refrigerant passes through the ninth bypass section H9. Therefore, considering the passage of the refrigerant through the hot gas bypass circuit H as a whole, the refrigerant that passed through the fourth bypass section H4, then continues to pass through the fifth to eighth bypass sections H8, the temperature of the refrigerant passing through the fourth bypass section H4 quickly becomes higher than the temperature of the refrigerant passing through the fifth to eighth bypass sections of H8.

Thus, the hot gas bypass circuit H is located on the lower plate 2b of the casing of the outdoor unit so as to pass near the area under the outdoor fans 26 and under the outdoor heat exchanger 23. Therefore, the vicinity of the area where the hot gas bypass circuit H passes can be heated by a high temperature refrigerant. diverted and supplied from the exhaust pipe A of the compressor 21 without using a heating device or other separate heat source. Therefore, even if the upper side of the lower plate 2b is wetted by rainwater or drainage water generated in the outdoor heat exchanger 23, ice formation can be prevented on the lower plate 2b under the outdoor fans 26 and under the outdoor heat exchanger 23. In this way, situations in which actuation of the outdoor fans 26 is blocked by ice, or situations in which the surface of the outdoor heat exchanger 23 is covered with ice, reducing heat exchange efficiency. The hot gas bypass circuit H is arranged to pass under the outdoor fans 26 after branching at the branch point A1 of the exhaust pipe A and before passing under the outdoor heat exchanger 23. Therefore, ice formation under the outdoor fans 26 can be prevented with great advantage.

<1-6> Electromagnetic induction heating device 6

Figure 10 is a schematic perspective view of an electromagnetic induction heating device 6 mounted on the storage tube F. Figure 11 is an external perspective view in which the protective cover 75 is removed from the electromagnetic induction heating device 6. Figure 12 is a sectional view of an electromagnetic induction heating device. device 6 mounted on the storage tube F.

An electromagnetic induction heating device 6 is arranged to cover the magnetic tube F2 from the radial outer side, the magnetic tube F2 being the heat generation portion of the storage tube F, and the magnetic tube F2 is configured to generate heat by electromagnetic induction heating. This heat generation portion of the storage tube F has a two-layer tubular structure including a copper tube F1 on the inside and a magnetic tube F2 on the outside.

The electromagnetic induction heating device 6 comprises a first hex nut 61, a second hex nut 66, a first coil cover 63, a second coil cover 64, a coil main body 65, a first ferrite casing 71, a second ferrite casing 72, a third ferrite casing 73, and a fourth ferrite casing 74 , a first magnetodielectric 98, a second magnetodielectric 99, a winding 68, a protective cover 75, an electromagnetic induction thermistor 14, a fuse 15, and other elements.

The first hex nut 61 and the second hex nut 66 are made of resin and are used to ensure the stability of the fixed state between the electromagnetic induction heating device 6 and the storage tube F using the ring C (not shown). The first coil cover 63 and the second coil cover 64 are made of resin and are used to close the storage tube F from the radial outer side in the upper end position and the lower end position, respectively. The first coil cover 63 and the second coil cover 64 contain four screw holes for screws 69, whereby the first to fourth ferrite housings 71-74, described below, are secured with screws 69. In addition, the second coil cover 64 contains an insertion hole 64f electromagnetic induction thermistor for inserting the electromagnetic induction thermistor 14 shown in Fig.12, and fixing it on the outer surface of the magnetic tube F2. The second coil cover 64 also includes a fuse insert hole 64e (see FIG. 14) for inserting the fuse 15 of FIG. 13 and securing it to the outer surface of the magnetic tube F2. The electromagnetic induction thermistor 14 comprises an electromagnetic induction thermistor detector 14a, an outer protrusion 14b, a side protrusion 14c, and an electromagnetic induction thermistor wire 14d for converting the result of determining the electromagnetic induction thermistor detector 14a to a signal and directing it to the control unit 11, as shown in FIG. 12. The electromagnetic induction thermistor detector 14a has a shape that corresponds to the curved shape of the outer surface of the storage tube F, and has a large contact surface area. The fuse 15 comprises a detector 15a, has an asymmetric shape and fuse wires 15d for converting the result of the detection of the fuse detector 15a into a signal and directing it to the control unit 11, as shown in FIG. 13. Upon receipt of a notification from the fuse 15 that a temperature has been determined that exceeds a predetermined temperature limit, the control unit 11 controls to cut off the power supply to the winding 68, preventing heat damage to the equipment. The main body 65 of the coil is made of resin, and the winding 68 is wound on the main body 65 of the coil. The coil 68 is wound in a spiral shape on the outside of the coil main body 65, the axial direction being the direction in which the storage tube F. passes. The coil 68 is connected to a control circuit board (not shown) and a high frequency electric current is supplied to the coil. The output signal of the control circuit board is regulated by the control unit 11. The electromagnetic induction thermistor 14 and the fuse 15 are fixed in a state in which the main coil body 65 and the second coil cover 64 are connected together, as shown in FIG. When fixing the electromagnetic induction thermistor 14, a satisfactory state of contact is maintained, which is under pressure with the outer surface of the magnetic tube F2 by radially pressing the leaf spring 16 to the magnetic tube F2. Similarly, when the fuse 15 is fixed, a satisfactory contact state under pressure with the outer surface of the magnetic tube F2 is maintained by pressing radially inward the leaf spring 17 to the magnetic tube F2. Thus, since the electromagnetic induction thermistor 14 and the fuse 15 are satisfactorily held in firm contact with the outer surface of the storage tube F, the sensitivity is increased and sudden temperature changes caused by electromagnetic induction heating can be quickly detected. Due to the first ferrite casing 71, the first coil cover 63 and the second coil cover 64 are held in the direction in which the storage tube F passes and are fixed in place by screws 69. The first ferrite casing 71 and the fourth ferrite casing 74 accommodate the first magnetodielectric 98 and the second magnetodielectric 99, which are made of highly magnetically permeable material. The first magnetodielectric 98 and the second magnetodielectric 99 absorb the magnetic field generated by the winding 68 and form a channel for magnetic flux, thereby delaying the leakage of the magnetic field to the outside, as shown in sectional view of the storage tube F and the electromagnetic induction heating device 6 in FIG. .fifteen. A protective cover 75 is located around the outer periphery of the electromagnetic induction heating device 6 and collects a magnetic flux that cannot be held only by the first magnetodielectric 98 and the second magnetodielectric 99. The magnetic flux is generally not scattered behind the protective cap 75, and the location where the magnetic flux is generated can be determined arbitrarily.

<1-7> Control of electromagnetic induction heating

The electromagnetic induction heating device 6 described above controls the forced generation of heat by the magnetic tube F2 of the storage tube F during startup, during which the heating of the air begins, when the refrigeration cycle forces the heating of the air while providing the ability to heat the air and during defrosting process.

The description below refers to startup time.

When the user enters a command to carry out the process of heating the air into the controller 90, the control unit 11 starts the process of heating the air. Upon starting the air heating process, the control unit 11 waits until the compressor 21 starts up and the pressure detected by the pressure sensor 29a rises to 39 kg / cm ² and then causes the internal fan 42 to be driven. This prevents discomfort for the user due to unheated air passing into the room at a stage in which the refrigerant passing through the internal heat exchanger 41 has not yet been heated. Electromagnetic induction heating using an electromagnetic induction heating device 6 is carried out here to reduce the start time of the compressor 21 and achieve a pressure detected by the pressure sensor 29a, 39 kg / cm ² . During electromagnetic induction heating, since the temperature of the storage tube F rises rapidly, before the start of electromagnetic induction heating, the control unit 11 controls to determine whether or not the conditions for starting electromagnetic induction heating are suitable. Examples of such a determination include a process for evaluating a flow condition, a process for determining a sensor compartment, a process for rapidly increasing pressure, and the like, as shown in the timing diagram of FIG. 16.

<1-8> Flow Condition Assessment Process

When carrying out electromagnetic induction heating, the heat load is only the refrigerant accumulated in the area of the storage tube F, where the electromagnetic induction heating device 6 is fixed, while the refrigerant does not pass into the storage tube F. Thus, when implementing electromagnetic induction heating using electromagnetic induction heating device 6, while the refrigerant does not pass into the storage tube F, the temperature of the storage tube F is It rises to such an extent that the refrigerant deteriorates. The temperature of the electromagnetic induction heating device 6 itself also rises, and the reliability of the equipment decreases. Therefore, there is a process for evaluating the flow condition, which ensures that the refrigerant passes into the storage tube F during the step before starting the electromagnetic induction heating, so that the electromagnetic induction heating by the electromagnetic induction heating device 6 is not carried out, while the refrigerant is still does not pass into collection tube F.

In the process of evaluating the flow conditions, the following processes are carried out, as shown in the flowchart in FIG.

In step S11, the control unit 11 determines whether or not the controller 90 received a command from the user for the process of heating the air, and not for the process of cooling the air. This determination is made, since the refrigerant must be heated by an electromagnetic induction heating device 6 in accordance with the conditions under which the process of heating the air is carried out.

In step S12, the control unit 11 starts the start of the compressor 21 and gradually increases the frequency of the compressor 21.

In step S13, the control unit 11 determines whether or not the frequency of the compressor 21 has reached the predetermined minimum frequency Qmin, and proceeds to step S14 when it is determined that the minimum frequency has been reached.

In step S14, the control unit 11 starts the process of evaluating the flow condition, stores the temperature data determined by the electromagnetic induction thermistor 14, and the temperature data detected by the outdoor heat exchange temperature sensor 29c when the frequency of the compressor 21 has reached the set minimum frequency Qmin (see point a in FIG. 16), and begins the countdown of the flow determination using the timer 95. If the frequency of the compressor 21 has not yet reached the set minimum frequency Qmin, the refrigerant passing through the storage tube F and the outdoor the heat exchanger 23 is in a gas-liquid double phase and maintains a constant temperature at the saturation temperature, and therefore, the temperatures detected by the electromagnetic induction thermistor 14 and the outdoor heat exchanger temperature sensor 29c are constant and unchanged at the saturation temperature. However, the frequency of the compressor 21 continues to increase after some time, the refrigerant pressures in the outdoor heat exchanger 23 and the storage tube F continue to decrease further, and the saturation temperature begins to decrease, as a result of which the temperatures detected by the electromagnetic induction thermistor 14 and the outdoor heat exchange temperature sensor 29c begin to decrease. Since the external heat exchanger 23 in this document is located further downstream than the storage tube F relative to the inlet side of the compressor 21, the point in time at which the temperature of the refrigerant in the outdoor heat exchanger 23 begins to fall earlier than the time at which the temperature of the refrigerant in the storage tube F begins to decline (see points b and c in FIG. 16).

In step S15, the control unit 11 determines whether or not the time equal to 10 seconds has elapsed to determine the flow, since the timer 95 has started to count, and the process proceeds to step S16 after the flow determination time has elapsed. If the flow determination time has not yet expired, step S15 is repeated.

In step S16, the control unit 11 obtains the temperature data measured by the electromagnetic induction thermistor 14 and the temperature data detected by the outdoor heat exchange temperature sensor 29c when the flow detection time has expired and the refrigerant temperatures in the outdoor heat exchanger 23 and the storage tube F have decreased, and then the process proceeds to step S17.

In step S17, the control unit 11 determines whether or not the temperature determined by the electromagnetic induction thermistor 14 obtained in step S16 has fallen 3 ° C or more lower than the temperature data determined by the electromagnetic induction thermistor 14 stored in step S14, and also determines whether it has fallen or not, the temperature determined by the outdoor heat transfer temperature sensor 29c obtained in step S16 is 3 ° C or more lower than the temperature data detected by the outdoor heat transfer temperature sensor 29c stored in step S14. Specifically, it is determined whether or not the decrease in refrigerant temperature was successfully determined during the flow determination time. When either the temperature detected by the electromagnetic induction thermistor 14 or the temperature detected by the outdoor heat exchange temperature sensor 29c has fallen by 3 ° C or more, it is determined that the refrigerant passes through the storage tube F and the refrigerant flow is provided, the flow condition evaluation process is completed, and a transition is made or to a process of rapid pressure increase during startup, in which the output signal of the electromagnetic induction heating device 6 is used at its maximum limit e, to a process for determining a sensor compartment or to another process.

On the other hand, when neither the temperature detected by the electromagnetic induction thermistor 14 nor the temperature detected by the outdoor heat exchange temperature sensor 29c has dropped by 3 ° C or more, the process proceeds to step S18.

In step S18, the control unit 11 determines that the amount of refrigerant passing through the storage tube F is insufficient for induction heating by the electromagnetic induction heating device 6, and the control unit 11 provides an abnormal flow state image on the display screen of the controller 90.

<1-9> The process of determining the sensor compartment

The process of determining the sensor compartment is a process for confirming the fixing state of the electromagnetic induction thermistor 14 and is carried out after fixing the electromagnetic induction thermistor 14 on the storage tube F, and the air conditioner 1 is ready when installed (after installation is complete, including after disconnecting the protection against power to the electromagnetic induction heating device 6) when the process of heating the air first begins. Specifically, the control unit 11 carries out the process of determining the separation of the sensor after it has been determined in the aforementioned process of evaluating the flow condition that the volume of refrigerant flow in the storage tube F has been provided, and before the process of rapidly increasing the pressure during startup, at which the electromagnetic signal induction heating device 6 is used at its maximum limit.

When transporting the air conditioner 1, unforeseen vibrations and other factors can cause an unstable fixed state or a disconnected state of the electromagnetic induction thermistor 14, and when the recently transported electromagnetic induction heating device 6 is activated for the first time, its reliability is especially necessary, and when the recently transported electromagnetic induction heating device 6 is powered for the first time accordingly, can be predicted to some extent, that subsequent processes will be stable. Therefore, the process of determining the separation of the sensor is carried out at the time described above.

In the process of determining the sensor compartment, the following processes are carried out, as shown in the flowchart of FIG. 18.

In step S21, the control unit 11 starts supplying electricity to the coil 68 of the electromagnetic induction heating device 6 while providing a volume of refrigerant flow in the storage tube F, which was confirmed by the process of evaluating the flow condition, or a larger volume of refrigerant flow, and while maintaining the temperature data determined electromagnetic induction thermistor 14 (see point d in Fig. 16) at the end of the time for determining the flow (i.e., the initial time for determining the separation of the sensor). Here, the electric power is supplied to the coil 68 of the electromagnetic induction heating device 6 during the time of determining the sensor compartment equal to 20 seconds, with a separately defined supply of electricity M1 (1 kW) at 50% of the output signal less than the specified maximum supplied electric power Mmax (2 kW). At this stage, since the fixing state of the electromagnetic induction thermistor 14 has not yet been confirmed as satisfactory, the output signal is reduced to 50%, so that the fuse 15 will not be damaged, and the resinous elements of the electromagnetic induction heating device 6 will not melt due to the inability of the electromagnetic induction thermistor 14 to determine this excessive temperature increase regardless of any excessive temperature increase in the storage tube F. Simultaneously but the time interval for continuous heating of the electromagnetic induction heating device 6 is set in advance so as not to exceed the maximum continuous output signal time of 10 minutes and, therefore, the control unit 11 causes the timer 95 to start counting the used time during which the electromagnetic induction heating device 6 continues to issue output signal. The supply of electricity to the coil 68 of the electromagnetic induction heating device 6 and the magnitude of the magnetic field generated by the coil 68 around itself are interconnected values.

In step S22, the control unit 11 determines whether or not the time for determining the sensor compartment has expired. If the time for determining the sensor compartment has expired, the process advances to step S23. If the time for determining the sensor compartment has not yet expired, step S22 is repeated.

In step S23, the control unit 11 obtains the temperature determined by the electromagnetic induction thermistor 14 at the time when the time for determining the sensor compartment has ended (point e in FIG. 16), and the process proceeds to step S24.

In step S24, the control unit 11 determines whether or not the temperature determined by the electromagnetic induction thermistor 14 has increased at the end of the time for determining the sensor compartment obtained in step S23 by 10 ° C or more above the temperature data determined by the electromagnetic induction thermistor 14 at the beginning of time determining a sensor compartment stored in step S21. Specifically, it is determined whether or not the temperature of the refrigerant has risen by 10 ° C or more due to induction heating by the electromagnetic induction heating device 6 during the time for determining the sensor compartment. By increasing the temperature determined by the electromagnetic induction thermistor 14 by 10 ° C or more, it is determined that it could be confirmed that the fixing state of the electromagnetic induction thermistor 14 on the storage tube F is satisfactory and that the storage tube F is accordingly heated by induction heating by electromagnetic induction heating device 6, the process of determining the separation of the sensor ends, and the process proceeds to the process of rapid increase starting pressure, at which the output signal of the electromagnetic induction heating device 6 is used at its maximum limit. On the other hand, if the temperature determined by the electromagnetic induction thermistor 14 does not rise by 10 ° C or more, the process advances to step S25.

In step S25, the control unit 11 counts the number of times at which the sensor separation repetition process was carried out. When the number of repetitions is less than ten, the process proceeds to step S26, and when the number of repetitions exceeds ten, the process proceeds to step S27 without going to step S26.

In step S26, the control unit 11 carries out the process of repeating the separation of the sensor. In this document, the temperature data determined by the electromagnetic induction thermistor 14, after 30 or more seconds (not shown in Fig. 16) are stored, electricity is supplied with a separate defined supply of electric power M1 to the coil 68 of the electromagnetic induction heating device 6 for 20 s, carried out the same processes of steps S22 and S23, the sensor separation determination process ends when the temperature determined by the electromagnetic induction thermistor 14 rises by 10 ° C or more, and the process proceeds to a process of rapidly increasing pressure at startup, in which the output signal of the electromagnetic induction heating device 6 is used at its maximum limit. On the other hand, if the temperature determined by the electromagnetic induction thermistor 14 does not rise by 10 ° C or more, the process returns to step S25.

In step S27, the control unit 11 determines that the fixing state of the electromagnetic induction thermistor 14 on the collecting tube F is unstable or unsatisfactory and provides an image of the abnormal state of the sensor compartment on the display screen of the controller 90.

<1-10> The process of rapidly increasing pressure

The control unit 11 starts the process of rapidly increasing pressure in a state in which the process of evaluating the flow conditions and the process of determining the separation of the sensor are completed, it was confirmed that a sufficient flow of refrigerant in the storage tube F was ensured, the fixing state of the electromagnetic induction thermistor 14 on the storage tube F is satisfactory , and the storage tube F was respectively heated using an electromagnetic induction heating device 6.

Even if induction heating by means of an electromagnetic induction heating device 6 is performed here with a high output signal, the reliability of the air conditioner 1 has been successfully increased since it has been confirmed that there is no excessive temperature increase in the storage tube F.

In the process of rapidly increasing pressure, the following processes are carried out as shown in FIG.

In step S31, the control unit 11 sets the power supply to the winding 68 of the electromagnetic induction heating device 6 not for a separate specific power supply M1 limited to 50% of the output signal, as it was during the process of determining the sensor compartment described above, but rather for a given maximum supplied electricity Mmax (2kW). This output signal from the electromagnetic induction heating device 6 continues until the pressure sensor 29a reaches the predetermined target high pressure Ph.

To prevent excessive increases in high pressure in the refrigeration cycle of the air conditioner 1, the control unit 11 forcibly shuts off the compressor 21 when the pressure sensor 29a detects an excessively high pressure Pr. The target high pressure Ph during this rapid pressure increase process is provided as a separate threshold value, which is a pressure value less than the excessively high pressure Pr.

In step S32, the control unit 11 determines whether or not the maximum continuous output signal time of 10 minutes has elapsed of the electromagnetic induction heating device 6 from the reference point in step S21 of the sensor separation determination process. If the maximum continuous output signal has not expired, the process proceeds to step S33. If the maximum continuous output signal has expired, the process advances to step S34.

In step S33, the control unit 11 determines whether or not the pressure detected by the pressure sensor 29a has reached the target high pressure Ph. If the target high pressure Ph has been reached, the process proceeds to step S34. If the target high pressure Ph has not been reached, step S32 is repeated.

In step S34, the control unit 11 starts driving the internal fan 42, terminates the process of rapidly increasing pressure, and proceeds to a stable output process.

When the process here proceeds from step S33 to step S34, the internal fan 42 starts to operate under conditions under which sufficiently heated conditioned air is successfully supplied to the user. When the process proceeds from step S32 to step S34, a condition of successfully supplying the user with sufficiently heated conditioned air has not been reached, but the conditioned air, which is partially heated, may be supplied, and the supply of heated air may begin in a range in which the used time from the beginning of the process heating the air is not too long.

<1-11> Steady output process

With a stable output process, the stably supplied electric power M2 (1.4 kW), which is equal to or greater than a single specific electric power supply M1 (1 kW) and equal to or less than the maximum supplied electric power Mmax (2 kW), is indicated as a fixed value of the output signal, and the frequency at which electric power is supplied to the electromagnetic induction heating device 6, is adjustable in deviation and integral, so that the temperature determined by the electromagnetic induction thermistor 14 is maintained Xia with a target temperature of 80 ° C accumulative tube at startup.

With a steady output process, the following processes are carried out as shown in the flowchart of FIG.

In step S41, the control unit 11 stores the temperature determined by the electromagnetic induction thermistor 14, and the process proceeds to step S42.

In step S42, the control unit 11 compares the temperature determined by the electromagnetic induction thermistor 14 stored in step S41 with the target temperature 80 ° C of the storage tube at start-up and determines whether or not the temperature determined by the electromagnetic induction thermistor 14 is set to the maintained temperature, which is lower than the target temperature of 80 ° C of the storage tube when it starts at the set temperature. If the determined temperature is equal to or less than the set maintained temperature, the process proceeds to step S43. If a specific temperature is not equal to or less than a predetermined maintained temperature, the process continuously waits until a certain temperature is equal to or less than a predetermined maintained temperature.

In step S43, the control unit 11 determines the time used from the end of the most recent power supply to the electromagnetic induction heating device 6.

In step S44, the control unit 11 determines, as one installation, a continuous supply of electricity to a fixed electromagnetic induction heating device 6 with a continuously supplied electric power M2 (1.4 kW) for 30 s and controls the deviation and integral at which the frequency of this installation increases in response to a longer used time period determined in step S43.

<1-12> Defrosting process

When the steady output process described above continues and the temperature detected by the outdoor heat exchange temperature sensor 29c of the outdoor heat exchanger 23 is a predetermined value or lower, a defrosting process is carried out, which is a process for melting frost adhering to the outdoor heat exchanger 23. Specifically, like setting the state connecting the four-way switching valve 22 during air cooling (the connection state shown by dashed lines in FIG. 1), high temperature ny high pressure gaseous refrigerant discharged from the compressor 21 is supplied to the outdoor heat exchanger 23 before passing through the indoor heat exchanger 41 and refrigerant condensing heat is used to melt frost adhering to the outdoor heat exchanger 23.

In the process of defrosting, the following processes are carried out, as shown in the flowchart in Fig.21.

In step S51, the control unit 11 confirms that the frequency of the compressor 21 is equal to or higher than the predetermined minimum frequency Qmin, which provides a predetermined amount of refrigerant for circulation, the volume of the refrigerant flow is provided by the process of evaluating the flow condition to some extent, so that electromagnetic induction heating can be performed, and the fixing state of the electromagnetic induction thermistor 14 is appropriate in accordance with the process of determining the separation of the sensor, and proceeds to step S52.

In step S52, the control unit 11 determines whether or not the temperature detected by the outdoor heat exchange temperature sensor 29c is less or not, 10 ° C. If it is less than 10 ° C, the process proceeds to step S53. If it is at least 10 ° C, step S52 is repeated.

In step S53, the control unit 11 stops the induction heating by the electromagnetic induction heating device 6 and transmits a defrost signal.

In step S54, after transmitting the defrost signal, the control unit 11 sets the connection state of the four-way valve 22 to the connection state of the air cooling process and also counts with the timer 95 of the time used after the start of the defrost when the connection state of the four-way valve 22 has become the connection state of the air cooling process.

In step S55, the control unit 11 determines whether or not 30 seconds have elapsed since the start of the defrost. If 30 s have elapsed, the process advances to step S56. If 30 seconds have not elapsed, step S55 is repeated.

In step S56, the control unit 11 drives the electric power supplied to the coil 68 of the electromagnetic induction heating device 6 to a predetermined maximum supplied electric energy Mmax (2 kW) and performs proportional-integral regulation of the frequency of the induction heating using the electromagnetic induction heating device 6, so that the temperature determined by the electromagnetic induction thermistor 14, reaches the target defrost temperature, which is 40 ° C (in contrast to the target perature accumulative tube at startup during steady output process). When the temperature detected by the outdoor heat transfer temperature sensor 29c drops below 0 ° C, then the hot gas bypass valve 27 of the hot gas bypass circuit H opens, the high-temperature gaseous high-pressure refrigerant is supplied to the area under the external fans 26 and under the external heat exchanger 23 to the upper surface of the lower the plate 2b of the outer unit 2, and ice formed on the upper surface of the lower plate 2b is removed. Since the connection state of the four-way valve 22 switches to the state of the air cooling process, the high-temperature gaseous high-pressure refrigerant leaving the compressor 21 passes from the branch / converge point 23k of the external heat exchanger 23 to the convergence / branch point 23j and converges into a single stream at the convergence point 23j / branching, as a result of which a refrigerant with a volume three times the volume of the branched tube K passes collectively through the tube J with constriction. Since the restriction tube J is located in the vicinity of the lower end of the external heat exchanger 23, a large amount of condensation heat can collectively be supplied to the vicinity of the lower end of the external heat exchanger 23. Thus, defrosting can be further accelerated.

In step S57, the control unit 11 determines whether or not the used defrost start time has exceeded 10 minutes. If it does not exceed 10 minutes, the process proceeds to step S58. If it exceeds 10 minutes, the process proceeds to step S59. Thus, the connection state of the four-way valve 22 can be prevented from remaining in a state of air cooling for 10 minutes or more, making it unlikely that the user will experience discomfort from lowering the temperature inside the room.

In step S58, the control unit 11 determines whether or not the temperature detected by the external heat exchange temperature sensor 29c is higher than 10 ° C. If it exceeds, the process proceeds to step S59. If it does not exceed, the process returns and repeats step S56.

In step S59, the control unit 11 turns off the compressor 21 to equalize the high and low pressures in the refrigeration cycle and completes the induction heating using the electromagnetic induction heating device 6.

In step S60, the control unit 11 switches the connection state of the four-way valve 22 to the connection state of the air heating process.

Then, the control unit 11 transmits a signal that completes the defrost. In addition, the control unit 11 gradually increases the frequency of the compressor 21 to a predetermined minimum frequency Qmin or higher and performs a stable output process until a condition is reached under which the defrosting process is carried out again. The hot gas bypass valve 27 of the hot gas bypass circuit H closes 5 seconds after transmitting a signal that completes the defrost.

<Characteristics of the air conditioning 1 of the present embodiment>

In the air conditioner 1, the process of rapidly increasing the pressure causes a process to be performed in which the output signal of the electromagnetic induction heating device 6 is brought to the maximum supplied electric power Mmax (2 kW), and the refrigerant passing to the internal heat exchanger 41 is quickly brought to high temperature and high pressure . Thus, it is possible to reduce the time required for heating the air, which will be supplied to the user after starting the start of the process of heating the air. In addition, by performing a stable output process in a state in which the interior of the room was heated to some extent, the stably supplied electric energy M2 (1.4 kW), which is the output signal of the electromagnetic induction heating device 6, limited below the maximum supplied electric energy Mmax (2 kW), reduced to a fixed output value. In this way, control deviation caused by an excessive increase in the output signal of the electromagnetic induction heating device 6 can be minimized.

When conducting electromagnetic induction heating, sharp temperature rises usually occur faster than temperature rises caused by changes in the refrigerant circulation conditions in the refrigeration cycle. As a protection against this, in the electromagnetic induction heating device 6, the electromagnetic induction thermistor 14, which is pressed against the magnetic tube F2 by the elastic force of the leaf spring 16, maintains a satisfactory sensitivity to rapid temperature changes caused by electromagnetic induction heating during the above-described steady output process achieved due to electromagnetic induction heating. Therefore, the sensitivity of a stable output process is satisfactory, and control deviation can be further minimized.

Since induction heating by means of an electromagnetic induction heating device 6 is carried out at a maximum supplied electric power Mmax (2 kW), the defrosting process can be accelerated. Since the temperature determined by the electromagnetic induction thermistor 14 is brought to a defrost target temperature of 40 ° C and is kept below the target storage tube temperature at startup during a steady output process, the deviation caused by the control is kept to a minimum.

<Other Embodiments>

Embodiments of the present invention have been described above based on the drawings, but the specific configuration is not limited to these embodiments, and modifications are possible within a range that does not deviate from the scope of the present invention.

(A)

In the embodiment described above, an example of a case has been described in which a process of rapidly increasing pressure, causing the electromagnetic induction heating device 6 to output an output signal at a maximum supplied electric power Mmax (2 kW), is completed at a time when the pressure detected by the pressure sensor 29a reaches the target high pressure Ph.

However, the present invention is not limited to this example.

The process of rapidly increasing the pressure, causing the electromagnetic induction heating device 6 to produce an output signal with a maximum supplied electric power Mmax (2 kW), can, for example, be completed at the time when the electromagnetic induction thermistor 14 determines the temperature set based on the temperature corresponding to the refrigerant of the target high pressure Ph passing through the fixed portion of the pressure sensor 29a.

In this case, too, since it is possible to confirm that the refrigerant supplied to the internal heat exchanger 41 has a sufficiently high temperature, this confirmation can be used as a determination indicator to start supplying heated conditioned air to the user at the beginning of the air heating process.

When using this type of electromagnetic induction thermistor 14, the determination of temperature changes when determining the end time of the process of rapid pressure increase can be done by determining the temperature of the electromagnetic induction thermistor 214 on the downstream side, which determines the temperature changes in the neighborhood downstream in the direction of the flow of the storage tube refrigerant F containing a magnetic tube F2, as shown, for example, in FIG. 22, and determining tempo changes Aturi not limited to the determination of temperature accumulation tube F.

(B)

In the embodiment described above, an example of a case has been described in which the fixing state of the electromagnetic induction thermistor 14 is confirmed as satisfactory by determining a temperature change determined by the electromagnetic induction thermistor 14 as a result of the transition of the electromagnetic induction heating device 6 from the off state to the magnetic field creation state .

However, the present invention is not limited to this example.

For example, the fixing state of the electromagnetic induction thermistor 14 can be confirmed by the transition of the electromagnetic induction heating device 6 from the state of creation of the magnetic field to the state of preventing the creation of the magnetic field. In this case, the fixing state of the electromagnetic induction thermistor 14 can be confirmed as satisfactory due to changes in a certain temperature at which the temperature determined by the electromagnetic induction thermistor 14 decreases.

The fixing state of the electromagnetic induction thermistor 14 can also be confirmed only by changing the electric power supplied to the coil 68 of the electromagnetic induction heating device 6, thereby changing the intensity of the generated magnetic field, and by obtaining the resulting temperature change determined by the electromagnetic induction thermistor 14.

(FROM)

In the embodiment described above, an example of a case has been described in which a determination is made as to whether or not the fixing state of the electromagnetic induction thermistor 14 is satisfactory given the temperature change determined by the electromagnetic induction thermistor 14, which determines the temperature of the magnetic tube F2 forming the outside storage tube F.

However, the present invention is not limited to this example.

In another embodiment, for example, temperature changes in the storage tube F can be determined using a determination device made of bimetal or the like to determine whether the temperature is higher than a predetermined temperature or less than a predetermined temperature, and by setting a predetermined temperature of the determination device by between the temperature before the process of determining the separation of the sensor and the subsequent temperature. In this case, even if it is not possible to determine a specific temperature during the process of determining the sensor compartment, the fixing state of the sensor can be confirmed by detecting temperature changes.

(D)

In the embodiment described above, an example of a case has been described in which the output signal of the electromagnetic induction heating device 6 for electromagnetic induction heating is set at 70% in a stable output process, while the frequency of its output signal is regulated.

However, the present invention is not limited to this example.

For example, in a stable output process, the output signal of the electromagnetic induction heating device 6 can be adjusted based on the temperature determined by the electromagnetic induction thermistor 14, while the frequency of the electromagnetic induction heating remains unchanged.

Another option is to control both the frequency of the electromagnetic induction heating and the output signal of the electromagnetic induction heating device 6 based on the temperature determined by the electromagnetic induction thermistor 14 in a stable output process.

(E)

In the embodiment described above, an example of a case has been described in which an electromagnetic induction heating device 6 is fixed to the storage tube F in the refrigerant circuit 10.

However, the present invention is not limited to this example.

For example, the electromagnetic induction heating device 6 may be fixed to the refrigerant tube, and not to the storage tube F. In this case, the magnetic tube F2 or other magnetic element is located on the portion of the refrigerant tube where the electromagnetic induction heating device 6 is fixed.

(F)

In the embodiment described above, an example of a case has been described in which the storage tube F is made in the form of a two-layer tube comprising a copper tube F1 and a magnetic tube F2.

However, the present invention is not limited to this example.

For example, the magnetic element F2a and two stoppers F1a, F1b may be located inside the storage tube F or the refrigerant tube as a heated object, as shown in FIG. 23. The magnetic element F2a is an element containing magnetic material, whereby heat is generated due to electromagnetic induction heating in the embodiment described above. The limiters F1a, F1b are located at two locations inside the copper tube F1, constantly providing the passage of the refrigerant, but not allowing the passage of the magnetic element F2a. Thus, the magnetic element F2 does not move despite the flow of refrigerant. Therefore, the predetermined position for heating in the collecting tube F or the like can be heated. In addition, since the magnetic element F2a for generating heat and the refrigerant are in direct contact, the heat transfer efficiency can be improved.

(G)

The magnetic element F2a described above in another embodiment (F) may be located in the tube without the use of stops F1a, F1b.

For example, the curved portions FW can be formed at two locations in the copper tube F1, and the magnetic element F2a can be located inside the copper tube F1 between the two curved portions FW, as shown in FIG. 24. Thus, the movement of the magnetic element F2a can also be prevented, while the refrigerant can pass.

(H)

In the embodiment described above, an example of a case has been described in which a winding 68 has been wound around a storage tube F to form a spiral.

However, the present invention is not limited to this example.

For example, a coil 168 wound around a coil main body 165 may be located around the periphery of the storage tube F without being wound around the storage tube F, as shown in FIG. 25. The main body 165 of the coil is positioned so that its axial direction is essentially perpendicular to the axial direction of the storage tube F. The main body 165 of the coil and the winding 168 are located in two separate parts to center the storage tube F.

In this case, for example, the first coil cover 163 and the second coil cover 164, which pass through the collecting tube F, can be located in the installation state above the main body 165, as shown, for example, in FIG. 26.

In addition, the first coil cover 163 and the second coil cover 164 can be fixed in place by midway between the first ferrite casing 171 and the second ferrite casing 172, as shown in FIG. 27. On Fig, shows an example of a case in which there are two ferrite casing to place in the middle of the storage tube F, but they can be located in four directions similar to the embodiment described above. The magnetodielectric may also be placed, similar to the embodiment described above.

<Other>

Embodiments of the present invention have been described above in several examples, but the present invention is not limited to these embodiments. For example, the present invention also includes combined embodiments obtained by a suitable combination of various parts of the above embodiments within a range that can be made based on descriptions by those skilled in the art.

Industrial applicability

In accordance with the present invention, performance during start-up can be quickly achieved, while deviation after start-up can be kept to a minimum, therefore, the present invention is especially used in an electromagnetic induction heating device and an air conditioner in which the refrigerant is heated by electromagnetic induction.

List of Reference Items

1 - air conditioning

6 - electromagnetic induction heating device

10 - refrigerant circuit

11 - control unit

14 - electromagnetic induction thermistor (refrigerant state parameter detector, temperature detector)

15 - fuse

16 - leaf spring (elastic element)

17 - leaf spring (elastic element)

21 - compressor

22 - four-way switching valve

23 - outdoor heat exchanger

24 - electric expansion valve

25 - drive

29a pressure transmitter (refrigerant status parameter detector)

29b - outdoor temperature sensor

29c - outdoor heat transfer temperature sensor

41 - internal heat exchanger

43 - indoor temperature sensor

44 - temperature sensor internal heat transfer

65 - the main body of the coil

68 - winding (magnetic field generator)

71-74 - the first ferrite body is the fourth ferrite body

75 - protective cover

90 - controller

95 - timer

98, 99 - the first magnetodielectric, the second magnetodielectric

F - storage tube, refrigerant tube (predetermined area for determining the state parameter)

F2 - magnetic tube (target area for heating)

M1 - separate defined power supply (magnetic field level)

M2 - steadily supplied electricity (first limit control value of the magnetic field)

Mmax - maximum supplied electric power (set maximum output signal)

Ph - target high pressure (first preset target state parameter)

List of patent literature

<Patent Literature 1> Japanese Published Laid-Open Patent Application No. 2009-97510.

Claims (11)

1. An air conditioner (1) that uses a refrigeration cycle including a compression mechanism (21) to circulate the refrigerant, a refrigerant pipe (F) that establishes thermal contact with the refrigerant passing through the refrigerant pipe (F), and / or an element (F2) for generating heat, which establishes thermal contact with the refrigerant passing through the pipe (F) for the refrigerant, and the air conditioner (1) contains:
a magnetic field generator (68) that generates a magnetic field for induction heating of the portion (F2) to be heated by induction heating;
a refrigerant state parameter detector (14, 29a) for determining a state parameter related to a refrigerant passing through a predetermined portion (F) to determine a state parameter that is at least part of the refrigeration cycle; and
a control unit (11) for implementing at least:
control the generation of the magnetic field at start-up during start-up, which includes the process of heating the air in the refrigeration cycle, the state in which the output of the magnetic field generator (68) is the predetermined maximum output signal (Mmax) starts from the point in time when it is assumed that the compression mechanism is in the actuation state and ends when the state parameter determined by the detector (14, 29a) of the refrigerant state parameter reaches the first predetermined target state parameter (Ph); and controlling the generation of the magnetic field after start-up, in which a state including applying a constraint such that the first limit reference value (M2) of the magnetic field, which is lower than the predetermined maximum output signal (Mmax), is the upper limit of the output signal of the magnetic field generator (68) , is carried out after the control of the generation of the magnetic field at startup. 2. Air conditioning (1) according to claim 1, in which the target area (F2) for heating due to induction heating contains magnetic material. 3. The air conditioner (1) according to claim 1, wherein the predetermined portion (F) for determining the state parameter is the portion in which the magnetic field is generated by the magnetic field generator (68). 4. The air conditioner (1) according to claim 1, in which the state parameter determined by the detector (14, 29a) of the state parameter of the refrigerant includes temperature and / or pressure related to the refrigerant passing through a given section (F) to determine the parameter condition. 5. The air conditioner (1) according to claim 1, wherein the detector (14, 29a) of the refrigerant state parameter is a temperature detector (14) for determining a temperature related to the refrigerant passing through a predetermined portion (F) for determining the state parameter; and
when controlling the generation of the magnetic field after starting, the control unit (11) performs proportional-integral regulation for proportionally-integral regulation of the magnitude of the magnetic field generated by the magnetic field generator (68) and / or the frequency at which the magnetic field generator (68) generates a magnetic field so that the temperature detected by the temperature detector (14) is maintained at the target maintenance temperature. 6. The air conditioner (1) according to claim 1, wherein the detector (14, 29a) of the refrigerant state parameter is a temperature detector (14) for determining a temperature related to the refrigerant passing through a predetermined portion (F) for determining the state parameter; and
the control unit (11) controls the generation of the magnetic field at start-up after the conditions for increasing the level of the magnetic field are fulfilled, at which the temperature changes determined by the temperature detector (14), or at which the temperature detector (14) determines the temperature change due to the process of changing the magnetic level field carried out to increase or decrease the level of the magnetic field generated by the magnetic field generator (68) within the range below the specified maximum output signal (Mma x). 7. The conditioner (1) according to claim 6, in which the maximum level (M1) of the magnetic field generated in the process of changing the level of the magnetic field is a value smaller than the first limit reference value (M2) of the magnetic field. 8. The air conditioner (1) according to any one of claims 1 to 7, in which the detector (14, 29a) of the refrigerant state parameter is a temperature detector (14) for determining the temperature related to the refrigerant passing through the predetermined portion (F) to determine the parameter condition; and
the control unit (11) determines the conditions for increasing the magnetic field level after the flow condition is fulfilled, at which the temperature determined by the temperature detector (14) changes between the first state of the compression mechanism and the second state of the compression mechanism when the compression mechanism forces two states of the compression mechanism with different output signals of the compression mechanism, one being the first state of the compression mechanism, and the other I It wishes to set up a second state of the compression mechanism with a higher output level than the first state of the compression mechanism. 9. The air conditioner (1) according to claim 1, wherein the detector (14, 29a) of the refrigerant state parameter is a temperature detector (14) for determining a temperature related to the refrigerant passing through a predetermined portion (F) for determining the state parameter; and the control unit (11) controls the output signal of the defrosting process to control the output signal of the magnetic field generator (68) based on the temperature determined by the temperature detector (14), the upper limit of the output signal being the specified maximum output signal (Mmax) when the refrigeration cycle implements a defrosting process different from the process of heating the air after the start of control of the magnetic field generation after starting. 10. The air conditioner (1) according to claim 9, in which during control of the output signal of the defrosting process, the control unit (11) performs proportional-integral defrost control, in which proportional-integral control is carried out, so that the temperature detected by the temperature detector (14) is maintained at a second predetermined target temperature that is lower than the first predetermined target temperature. 11. The air conditioner (1) according to any one of claims 1 to 7, 9 or 10, wherein the detector (14, 29a) of the refrigerant state parameter is a temperature detector (14) for determining a temperature related to the refrigerant passing through a predetermined portion (F ) to determine the state parameter; and
the air conditioner (1) further comprises an elastic element (16, 17) for applying an elastic force to the temperature detector (14); and
the temperature detector (14) is pressed against a predetermined portion (F) to determine the state parameter using the elastic force of the elastic element (16, 17).

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