Refrigeration cycle device and refrigeration cycle system

Abstract

The refrigeration cycle device of the present disclosure is a refrigeration cycle device including a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism, having: a refrigerant pipe connecting the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate a refrigerant, and having aluminum as a main component; a corrosion sensor configured to at least one of an outer side surface of the refrigerant pipe and a surrounding of the refrigerant pipe to measure a resistance; and a processing portion to estimate a life of the refrigerant pipe based on a change in the resistance measured by the corrosion sensor, the refrigerant pipe having a sacrificial layer that is inferior to the main component of the refrigerant pipe on the outer side surface of the refrigerant pipe.

Description

Technical Field

[0001] This disclosure relates to refrigeration cycle apparatus and refrigeration cycle system. Background Technology

[0002] As a refrigeration cycle device, for example, Patent Document 1 discloses an air conditioner that can control the lifespan of the outdoor unit of an air conditioner.

[0003] Patent Document 1 discloses an air conditioner equipped with a corrosion resistance diagnostic device. The corrosion resistance diagnostic device described in Patent Document 1 includes a core material layer and a sacrificial layer in contact with the core material layer, which has lower corrosion resistance than the core material layer. Corrosion resistance is determined by evaluating the degree of corrosion in the sacrificial layer. Furthermore, by determining the depth of corrosion in the sacrificial layer, the remaining lifespan of the product can be determined.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2017 / 199569 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, in the air conditioner described in Patent Document 1, there is still room for improvement in terms of the accuracy of the lifespan calculation.

[0009] Therefore, the purpose of this disclosure is to solve the above-mentioned problems and provide a refrigeration cycle device and refrigeration cycle system that can improve the accuracy of lifespan estimation of the refrigeration cycle device.

[0010] Methods for solving problems

[0011] A refrigeration cycle device according to one aspect of this disclosure is a refrigeration cycle device including a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism, having:

[0012] The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum.

[0013] A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and

[0014] The processing unit, based on the change in resistance measured by the corrosion sensor, estimates the lifespan of the refrigerant piping.

[0015] The refrigerant piping has a sacrificial layer on its outer surface that is less dense than the main component of the refrigerant piping.

[0016] The refrigeration cycle system of one aspect of this disclosure includes:

[0017] A refrigeration cycle device, comprising a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism; and

[0018] The processing device communicates with the refrigeration cycle unit via a network.

[0019] The refrigeration cycle device has:

[0020] The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum.

[0021] A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and

[0022] The storage unit stores information about the resistance measured by the corrosion sensor; and

[0023] The first communication unit transmits information about the resistor stored in the storage unit via the network.

[0024] The refrigerant piping has a sacrificial layer on its outer surface that is lower than the main component of the refrigerant piping.

[0025] The processing device has:

[0026] The second communication unit receives information about the resistor via the network; and

[0027] The processing unit calculates the lifespan of the refrigerant piping based on the change in resistance.

[0028] Invention Effects

[0029] According to this disclosure, the accuracy of lifespan estimation for refrigeration cycle devices can be improved. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an example of a refrigeration cycle apparatus according to Embodiment 1 of this disclosure.

[0031] Figure 2 This is a schematic diagram of the second heat exchanger in Embodiment 1.

[0032] Figure 3 This is a cross-sectional view of the corrosion sensor according to Embodiment 1.

[0033] Figure 4This is a graph showing the relationship between the resistance value detected by the corrosion sensor in Embodiment 1 and the elapsed time.

[0034] Figure 5A It is a graph showing the relationship between the cross-sectional area ratio calculated from the resistance value detected by the corrosion sensor based on embodiment 1 and the elapsed time.

[0035] Figure 5B It means from Figure 5A A graph showing the relationship between the cross-sectional area ratio and the elapsed time after a certain period of time.

[0036] Figure 6 This is a schematic diagram of the RCM sensor of variation 1 of embodiment 1.

[0037] Figure 7 This is a schematic diagram of the corrosion sensor according to Embodiment 2 of this disclosure.

[0038] Figure 8 This is a block diagram of the refrigeration cycle apparatus according to Embodiment 3 of this disclosure.

[0039] Figure 9 This is a block diagram of the refrigeration cycle system according to Embodiment 4 of this disclosure. Detailed Implementation

[0040] (The reason for this disclosure)

[0041] In a refrigeration cycle device, the refrigerant piping that circulates the refrigerant is, for example, made of a material with aluminum as the main component.

[0042] However, refrigerant piping with aluminum as its main component is susceptible to pitting corrosion in saline or high-humidity environments, posing a risk of corrosion penetration. Pitting corrosion occurs radially within the refrigerant piping. To suppress pitting corrosion, a sacrificial layer that corrodes preferentially over the piping is sometimes applied to its outer surface. In recent years, to proactively address corrosion-induced penetration in refrigerant piping, it has become necessary to improve the accuracy of refrigerant piping lifespan estimations.

[0043] Therefore, the inventors discovered that corrosion reduces the cross-sectional area of ​​the sacrificial layer, leading to changes in the resistance of the sacrificial layer and refrigerant piping. They investigated the structure of a refrigeration cycle device that uses a corrosion sensor to measure the resistance of the sacrificial layer and refrigerant piping. Furthermore, after thoroughly studying the resistance changes measured by the corrosion sensor in this configuration, the inventors found that the lifespan of aluminum-based refrigerant piping can be estimated with good accuracy based on these resistance changes.

[0044] Based on these new discoveries, the inventors make the following disclosure.

[0045] A refrigeration cycle device according to one aspect of this disclosure is a refrigeration cycle device including a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism, having:

[0046] The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum.

[0047] A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and

[0048] The processing unit, based on the change in resistance measured by the corrosion sensor, estimates the lifespan of the refrigerant piping.

[0049] The refrigerant piping has a sacrificial layer on its outer surface that is less dense than the main component of the refrigerant piping.

[0050] This structure improves the lifespan of the refrigerant piping, thus increasing the accuracy of lifespan estimation for the refrigeration cycle system. Furthermore, by incorporating a sacrificial layer on the aluminum-based refrigerant piping, corrosion of the piping can be inhibited.

[0051] The refrigeration cycle device of the second aspect of this disclosure may include: a temperature sensor that further measures the temperature around the corrosion sensor.

[0052] The processing unit corrects the resistance measured by the corrosion sensor based on the temperature measured by the temperature sensor.

[0053] This structure allows for the correction of the resistance measured by the corrosion sensor based on the ambient temperature. This, in turn, improves the accuracy of refrigerant piping life estimation.

[0054] In the refrigeration cycle apparatus of the third aspect of this disclosure, a corrosion sensor may be configured on the refrigerant piping configured on at least one of the first heat exchanger and the second heat exchanger.

[0055] This structure improves the accuracy of estimating the lifespan of refrigerant piping configured in at least one of the first and second heat exchangers.

[0056] In the refrigeration cycle apparatus of the fourth aspect of this disclosure, the corrosion sensor may include:

[0057] Substrate;

[0058] A substrate sacrificial layer is disposed on the surface of the substrate, and its surface potential is lower than that of the substrate.

[0059] A constant current flows to the power supply section of the substrate and the substrate sacrificial layer;

[0060] A measuring unit that measures the voltage applied to the substrate and the substrate sacrificial layer; and

[0061] The conversion unit converts the voltage measured by the measuring unit into a resistance.

[0062] The main component of the substrate is the same as the main component of the refrigerant piping.

[0063] The principal component of the substrate sacrificial layer is the same as the principal component of the sacrificial layer.

[0064] With this structure, by forming the substrate with the same constituent material as the refrigerant piping and the substrate sacrificial layer with the same constituent material as the sacrificial layer of the refrigerant piping, the accuracy of estimating the lifespan of the refrigerant piping can be further improved.

[0065] In the refrigeration cycle apparatus of the fifth aspect of this disclosure, the thickness of the substrate may be approximately the same as the thickness of the refrigerant piping.

[0066] The thickness of the substrate sacrificial layer is approximately the same as the thickness of the sacrificial layer.

[0067] This structure allows for the reproduction of the corrosive environment of refrigerant piping within the corrosion sensor. This, in turn, improves the accuracy of refrigerant piping lifespan estimation.

[0068] In the refrigeration cycle apparatus of the sixth aspect of this disclosure, the substrate and the substrate sacrificial layer may be sheet materials.

[0069] This structure allows the corrosion sensor to be positioned at the desired location within the refrigeration cycle unit.

[0070] In the refrigeration cycle apparatus of the seventh aspect of this disclosure, the substrate may be formed from a portion of the refrigerant piping.

[0071] The substrate sacrificial layer is formed from a portion of the sacrificial layer.

[0072] This structure allows for the detection of actual corrosion in refrigerant piping, further improving the accuracy of refrigerant piping life estimation.

[0073] In the refrigeration cycle apparatus of the eighth aspect of this disclosure, the processing unit may periodically calculate a first cross-sectional area comprising the substrate and the substrate sacrificial layer based on the resistance measured by the corrosion sensor.

[0074] The lifespan of the refrigerant piping is estimated based on the decreasing trend of the first cross-sectional area due to corrosion.

[0075] With this structure, the processing unit can estimate the lifespan of the refrigerant piping based on changes in resistance.

[0076] In the refrigeration cycle apparatus of the ninth aspect of this disclosure, the processing unit may further include:

[0077] Calculate the cross-sectional area ratio, which is the ratio of the first cross-sectional area to the second cross-sectional area of ​​the substrate and the substrate sacrificial layer before use, including the refrigerant piping.

[0078] The time point at which the cross-sectional area ratio decreases below the threshold is taken as the lifespan of the refrigerant piping.

[0079] With this structure, the processing unit can estimate the lifespan of the refrigerant piping based on changes in resistance.

[0080] In the refrigeration cycle apparatus of the tenth aspect of this disclosure, the threshold may be the ratio of the cross-sectional area of ​​the substrate to the second cross-sectional area.

[0081] This structure allows the time when the substrate sacrificial layer disappears to be used as the lifespan of the refrigerant piping. This further improves the accuracy of estimating the lifespan of refrigerant piping with aluminum as the main component.

[0082] In the refrigeration cycle apparatus of aspect 11 of this disclosure, the processing unit may calculate an approximate formula for the cross-sectional area ratio and estimate the lifespan of the refrigerant piping based on the approximate formula and a threshold.

[0083] With this structure, the processing unit can predict the lifespan of the refrigerant piping before the substrate sacrificial layer disappears, based on changes in resistance.

[0084] The refrigeration cycle apparatus of the 12th aspect of this disclosure may further include a display unit that displays the lifespan of the refrigerant piping calculated by the processing unit.

[0085] This structure allows users to see the results of corrosion assessments, which helps in responding to corrosion.

[0086] The refrigeration cycle apparatus of aspect 13 of this disclosure may further include a four-way valve that changes the direction of flow of the refrigerant in the refrigerant piping.

[0087] Such a structure can, for example, improve the accuracy of estimating the lifespan of refrigerant piping in air conditioners.

[0088] The refrigeration cycle system of aspect 14 of this disclosure includes:

[0089] A refrigeration cycle device, comprising a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism; and

[0090] The processing device communicates with the refrigeration cycle unit via a network.

[0091] The refrigeration cycle device has:

[0092] The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum.

[0093] A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and

[0094] The storage unit stores information about the resistance measured by the corrosion sensor; and

[0095] The first communication unit transmits information about the resistor stored in the storage unit via the network.

[0096] The refrigerant piping has a sacrificial layer on its outer surface that is lower than the main component of the refrigerant piping.

[0097] The processing device has:

[0098] The second communication unit receives information about the resistor via the network; and

[0099] The processing unit calculates the lifespan of the refrigerant piping based on the change in resistance.

[0100] This structure improves the accuracy of refrigerant piping life estimation in refrigeration cycle units and enables the transmission of resistance information detected by corrosion sensors from the refrigeration cycle unit to other units.

[0101] (Implementation Method 1)

[0102] The refrigeration cycle apparatus of Embodiment 1 of this disclosure will be described. Furthermore, in the following description, an air conditioner in cooling operation will be described as an example of the refrigeration cycle apparatus of Embodiment 1, but the refrigeration cycle apparatus is not limited to an air conditioner.

[0103] [Overall Structure]

[0104] Figure 1 This is a schematic diagram illustrating an example of the refrigeration cycle apparatus 1 according to Embodiment 1 of this disclosure. Figure 1 As shown, the refrigeration cycle device 1 includes a first heat exchanger 2, a compressor 3, a second heat exchanger 4, an expansion mechanism 5, a refrigerant piping 6, a four-way valve 8, a corrosion sensor 11, and a processing unit 12.

[0105] In the refrigeration cycle unit 1, the first heat exchanger 2 and a portion of the refrigerant piping 6 constitute the indoor unit 9, which is located indoors. On the other hand, the compressor 3, the second heat exchanger 4, the expansion mechanism 5, the four-way valve 8, and a portion of the refrigerant piping 6 constitute the outdoor unit 10, which is located outdoors.

[0106] <First Heat Exchanger>

[0107] The first heat exchanger 2 includes fins, refrigerant piping 6 disposed inside the first heat exchanger 2, and an indoor fan. The fins are composed of multiple thin metal plates arranged with their surfaces parallel to each other. The fins are used for heat exchange with air. The refrigerant piping 6 is orthogonal to the surface of the fins and is configured in a bent state to repeatedly penetrate the fins, causing the refrigerant flowing into the first heat exchanger 2 to evaporate. The indoor fan blows air, whose temperature has been regulated by the first heat exchanger 2, into the room.

[0108] <Compressor>

[0109] The compressor 3 is connected to the first heat exchanger 2 and the four-way valve 8 via the refrigerant piping 6. The compressor 3 is used to compress the refrigerant flowing in from the refrigerant piping 6 on the side of the first heat exchanger 2.

[0110] <Second Heat Exchanger>

[0111] The second heat exchanger 4 includes fins, refrigerant piping 6 disposed inside the second heat exchanger 4, and an outdoor fan. The fins have the same construction as the fins of the first heat exchanger 2. The refrigerant piping 6 is orthogonal to the surface of the fins and is configured in a bent state to repeatedly penetrate the fins, causing the refrigerant flowing into the second heat exchanger 4 to condense. The outdoor fan blows air whose temperature has been adjusted by the second heat exchanger 4 to the outside.

[0112] <Expansion Mechanism>

[0113] The expansion mechanism 5 is connected to the first heat exchanger 2 and the second heat exchanger 4 via refrigerant piping 6. The expansion mechanism 5 is used to expand the refrigerant flowing in from the refrigerant piping 6 on the side of the second heat exchanger 4. For example, the expansion mechanism 5 is an expansion valve.

[0114] <Refrigerant piping>

[0115] The refrigerant piping 6 is configured to connect the first heat exchanger 2, the compressor 3, the four-way valve 8, the second heat exchanger 4, and the expansion mechanism 5. Furthermore, the refrigerant piping 6 forms part of both the first heat exchanger 2 and the second heat exchanger 4. For example, the refrigerant piping 6 is configured to connect the first heat exchanger 2, the compressor 3, the four-way valve 8, the second heat exchanger 4, and the expansion mechanism 5 in that order.

[0116] The refrigerant piping 6 has a flow path for the refrigerant to flow inside the refrigerant piping 6, allowing the refrigerant to circulate. For example, the refrigerant piping 6 can have a hollow cylindrical shape. Alternatively, the refrigerant piping 6 can have a hollow polygonal cylindrical shape.

[0117] The refrigerant piping 6 is an aluminum alloy with aluminum as its main component. The material constituting the refrigerant piping 6 contains 80 wt% or more aluminum. Preferably, the material constituting the refrigerant piping 6 contains 90 wt% or more aluminum. More preferably, the material constituting the refrigerant piping 6 contains 95 wt% or more aluminum. Furthermore, the material constituting the refrigerant piping 6 may contain at least one of silicon, iron, manganese, and magnesium as an additive. For example, aluminum alloys from the 1000, 3000, and 5000 series can be cited as materials constituting the refrigerant piping 6. In Embodiment 1, the refrigerant piping 6 is formed of a 3003 aluminum alloy.

[0118] A sacrificial layer 7 is provided on the outer surface of the refrigerant pipe 6. The sacrificial layer 7 may be partially formed on the outer surface of the refrigerant pipe 6. For example, the sacrificial layer 7 may be formed by spraying the refrigerant pipe 6. In addition, the sacrificial layer 7 may be formed by bonding in a manner that covers the outer surface of the refrigerant pipe 6. For example, the sacrificial layer 7 may be formed as a cladding for the refrigerant pipe 6.

[0119] The sacrificial layer 7 is formed of a material having a lower surface potential than aluminum. The sacrificial layer 7 can be an alloy layer having a lower surface potential than aluminum. For example, the sacrificial layer 7 is an aluminum-zinc alloy layer having a zinc concentration of 1 wt% to 15 wt%. Furthermore, when the sacrificial layer 7 is an aluminum-zinc alloy layer, the zinc concentration can vary along the depth direction of the sacrificial layer 7. In Embodiment 1, the sacrificial layer 7 is formed of an aluminum-2 wt% zinc alloy layer.

[0120] The thickness of the sacrificial layer 7 can be designed according to the operating environment of the refrigerant piping 6.

[0121] Four-way valve

[0122] The four-way valve 8 is connected to the compressor 3, the first heat exchanger 2, and the second heat exchanger 4 via the refrigerant piping 6. During cooling operation, the four-way valve 8 delivers the refrigerant flowing from the compressor 3 to the second heat exchanger 4. On the other hand, the four-way valve 8 changes the direction of refrigerant flow according to the operating mode of the refrigeration cycle device 1 (cooling operation, heating operation).

[0123] <Corrosion Sensor>

[0124] The corrosion sensor 11 reproduces the corrosion of the refrigerant piping 6 and measures the resistance of the corrosion sensor 11 as it changes due to corrosion. The corrosion sensor 11 can continuously and quantitatively measure the resistance from the start of use of the refrigeration cycle unit 1. For example, the corrosion sensor 11 measures the resistance once per hour.

[0125] The corrosion sensor 11 is disposed around the refrigerant piping 6. "Disposed around the refrigerant piping 6" means indirectly disposed on the refrigerant piping 6 via other components. When the refrigerant piping 6 is not condensing, it can be disposed around the refrigerant piping 6 where the refrigerant temperature is lowest. On the other hand, when humidity is high and condensation occurs on the refrigerant piping 6, it can be disposed in a location prone to water accumulation.

[0126] Figure 2 This is a schematic diagram of the second heat exchanger 4 in Embodiment 1. Figure 2 As shown, the second heat exchanger 4 includes a refrigerant piping 6b, fins 21, and a corrosion sensor 11. The corrosion sensor 11 is disposed around the refrigerant piping 6b and fixed to the fins 21.

[0127] In embodiment 1, the corrosion sensor 11 is disposed around the refrigerant piping 6b. During the cooling operation of the refrigeration cycle unit 1, the refrigerant flows along... Figure 2 The flow direction indicated by the arrow is that the temperature of refrigerant pipe 6b is lower than that of refrigerant pipe 6a. By arranging a corrosion sensor 11 around refrigerant pipe 6b, the sensitivity of the corrosion sensor 11 can be improved due to the low ambient temperature around refrigerant pipe 6b.

[0128] In embodiment 1, the corrosion sensor 11 is fixed to the fin 21. For example, it can be fixed by clips, cable ties, welding, or adhesive. Alternatively, the corrosion sensor 11 can be arranged around the refrigerant piping 6 by inserting it into the housing of the fin 21 installed in the second heat exchanger 4.

[0129] The size of the corrosion sensor 11 can be designed according to the installation location and installation method.

[0130] Figure 3 This is a cross-sectional view of the corrosion sensor 11 according to Embodiment 1. Figure 3 As shown, the corrosion sensor 11 includes a substrate 13, a substrate sacrificial layer 14, a power supply unit 15, a measuring unit 16, a conversion unit 17, and a wire 20.

[0131] The substrate 13 has the same main component as the refrigerant piping 6. For example, the substrate 13 is formed of the same material as the material constituting the refrigerant piping 6. In Embodiment 1, the main component of the substrate 13 is aluminum.

[0132] The substrate 13 is formed in a plate shape. The thickness of the substrate 13 can be approximately the same as the thickness of the refrigerant piping 6. For example, the thickness of the substrate 13 is 0.8 times or more and 1.2 times or less than the thickness of the refrigerant piping 6. Preferably, the thickness of the substrate 13 is 0.9 times or more and 1.1 times or less than the thickness of the refrigerant piping 6.

[0133] The substrate sacrificial layer 14 is laminated on one surface of the substrate 13. The substrate 13 may also be exposed on the surface after the substrate sacrificial layer 14 is laminated.

[0134] The substrate sacrificial layer 14 is formed of a material having a lower surface potential than the substrate 13. Because the surface potential of the substrate sacrificial layer 14 is lower than that of the substrate 13, the substrate sacrificial layer 14 is preferentially corroded. When the substrate sacrificial layer 14 corrodes, its thickness decreases, and a corrosion portion 18 is formed in the substrate sacrificial layer 14. The corrosion portion 18 is the portion whose thickness decreases due to corrosion. Furthermore, the substrate sacrificial layer 14 has the same main component as the main component of the sacrificial layer 7 of the refrigerant piping 6. For example, the substrate sacrificial layer 14 is formed of the same material as the material constituting the sacrificial layer 7. Therefore, the corrosion of the sacrificial layer 7 of the refrigerant piping 6 can be reproduced in the substrate sacrificial layer 14. As a result, the lifespan of the refrigerant piping 6 can be accurately estimated based on the corrosion of the substrate sacrificial layer 14 in the corrosion sensor 11. In Embodiment 1, the substrate sacrificial layer 14 is formed of an aluminum-2wt% zinc alloy layer.

[0135] The substrate sacrificial layer 14 is formed in a plate shape. The thickness of the substrate sacrificial layer 14 and the thickness of the sacrificial layer 7 of the refrigerant piping 6 can be approximately the same. For example, the thickness of the substrate sacrificial layer 14 is 0.8 times or more and 1.2 times or less than the thickness of the sacrificial layer 7. Preferably, the thickness of the substrate sacrificial layer 14 is 0.9 times or more and 1.1 times or less than the thickness of the sacrificial layer 7. Furthermore, the thickness of the substrate sacrificial layer 14 can be smaller than the thickness of the sacrificial layer 7. When the thickness of the substrate sacrificial layer 14 is smaller than the thickness of the sacrificial layer 7, the substrate sacrificial layer 14 disappears before the sacrificial layer 7. Therefore, when estimating the lifespan of the refrigerant piping 6 based on the disappearance of the substrate sacrificial layer 14, the lifespan of the refrigerant piping 6 can be estimated more safely. Estimating the lifespan of the refrigerant piping 6 safely means estimating the lifespan of the refrigerant piping 6 in the state before the refrigerant piping 6 penetrates. By estimating the lifespan of the refrigerant piping 6 more safely, corrosion of the refrigerant piping 6 can be dealt with more reliably before the refrigerant piping 6 penetrates.

[0136] The power supply unit 15 allows a constant current to flow to the substrate 13 and the substrate sacrificial layer 14. For example, the power supply unit 15 provides a current of 10mA.

[0137] The measuring unit 16 measures the voltage applied to the substrate 13 and the substrate sacrificial layer 14. The measuring unit 16 can measure the voltage intermittently. For example, the measuring unit 16 measures the voltage once per hour. Furthermore, as a measurement method, any method capable of measuring the minute resistance of a metallic material is acceptable. For example, a four-terminal method can be used.

[0138] The conversion unit 17 converts the voltage measured by the measuring unit 16 into resistance. Specifically, the conversion unit 17 divides the voltage measured by the measuring unit 16 by the current value provided by the power supply unit 15, and converts it into the resistance between the substrate 13 and the substrate sacrificial layer 14.

[0139] A wire 20 is disposed between the power supply unit 15, the measuring unit 16, the conversion unit 17, and the temperature sensor 19, electrically connecting them. The wire 20 is formed of a conductive material. For example, the wire 20 is formed of copper.

[0140] <Temperature Sensor>

[0141] Temperature sensor 19 measures the temperature around corrosion sensor 11. Since resistance is temperature-dependent, the measurement accuracy can be improved by temperature-correcting the resistance. Temperature sensor 19 can measure temperature intermittently. For example, temperature sensor 19 performs measurements at intervals synchronized with measuring unit 16.

[0142] Processing Department

[0143] The elements constituting the processing unit 12 include, for example, a memory (not shown) that stores programs that enable these elements to work, and processing circuitry (not shown) corresponding to a processor such as a CPU (central processing unit). The processor can function as these elements by executing programs.

[0144] The processing unit 12 estimates the lifespan of the refrigerant piping 6 based on the resistance measured by the corrosion sensor 11. Specifically, the processing unit 12 calculates the first cross-sectional area A1 of the cross-section including the substrate 13 and the substrate sacrificial layer 14, and estimates the lifespan of the refrigerant piping 6 based on the trend of the first cross-sectional area A1 decreasing due to corrosion. In Embodiment 1, the substrate sacrificial layer 14 and the substrate 13 of the corrosion sensor 11 are formed of the same material as the sacrificial layer 7 and the refrigerant piping 6, respectively. Therefore, the corrosion sensor 11 can reproduce the corrosion status of the refrigerant piping 6 and the sacrificial layer 7. Thus, the processing unit 12 estimates the lifespan of the refrigerant piping 6 based on the resistance obtained by the corrosion sensor 11. Furthermore, the lifespan of the refrigerant piping 6 is also the lifespan of the refrigeration cycle device 1.

[0145] In Embodiment 1, the cross-sectional area ratio (A1 / A0) is calculated by taking the ratio of the first cross-sectional area A1 of the cross-section including the substrate 13 and the substrate sacrificial layer 14 to the second cross-sectional area A0 of the cross-section including the substrate 13 and the substrate sacrificial layer 14 before use. "Before use" refers to before the refrigerant pipe 6 is exposed to a moisture-containing atmosphere and before the sacrificial layer 7 corrodes. That is, "before use" means when the refrigerant pipe 6 has not corroded. The processing unit 12 calculates the lifespan of the refrigerant pipe 6 as the time T1 during which the cross-sectional area ratio (A1 / A0) falls below the threshold S1.

[0146] For example, the threshold S1 is the cross-sectional area ratio (A1 / A0) when the substrate sacrificial layer 14 disappears. That is, the threshold S1 is the cross-sectional area ratio (A2 / A0) of the cross-sectional area A2 of the substrate 13 and the second cross-sectional area A0 of the substrate 13 and the substrate sacrificial layer 14 before the refrigerant piping 6 is used. Furthermore, at the threshold S1, since the substrate sacrificial layer 14 reproduces the corrosion of the sacrificial layer 7 and disappears, the processing unit 12 can calculate that the sacrificial layer 7 disappears in the refrigerant piping 6.

[0147] The processing unit 12 can continue to calculate the cross-sectional area based on the resistance until the cross-sectional area ratio (A1 / A0) decreases below the threshold S1. Furthermore, the processing unit 12 can calculate an approximate formula for the cross-sectional area ratio (A1 / A0) by interpolating the cross-sectional area ratio (A1 / A0) of the substrate sacrificial layer 14 and the substrate 13. Therefore, the time point T1 at which the cross-sectional area ratio (A1 / A0) decreases below the threshold S1 can be predicted, i.e., the lifespan of the refrigerant piping 6. For example, the approximate formula can be calculated using the least squares method.

[0148] Furthermore, the processing unit 12 corrects the resistance measured by the corrosion sensor 11 based on the temperature measured by the temperature sensor 19. The temperature dependence of resistivity of the materials used in the substrate 13 and the substrate sacrificial layer 14 is pre-established and input into the processing unit 12. The resistance is determined based on the temperature measured by the temperature sensor 19 according to the pre-established temperature dependence. There is a tendency for resistivity to increase with increasing temperature. On the other hand, if the resistivities of the substrate 13 and the substrate sacrificial layer 14 are significantly different, it can be assumed that the substrate 13 and the substrate sacrificial layer 14 form a parallel circuit. In this case, the measuring unit 16 measures the voltage of each of the substrate 13 and the substrate sacrificial layer 14, the conversion unit 17 converts the respective voltages into resistances, and the processing unit 12 calculates the combined resistance of the substrate 13 and the substrate sacrificial layer 14 to obtain the resistance of the corrosion sensor 11.

[0149] The processing unit 12 is electrically connected to the corrosion sensor 11. The processing unit 12 can be configured around the corrosion sensor 11.

[0150] [action]

[0151] A detailed description of an example of the operation of the refrigeration cycle device 1 will be provided.

[0152] The corrosion sensor 11 measures the resistance of the substrate sacrificial layer 14 and the substrate 13. Specifically, the power supply unit 15 supplies a constant current to the substrate 13 and the substrate sacrificial layer 14, the measuring unit 16 measures the voltage applied to the substrate 13 and the substrate sacrificial layer 14, and the conversion unit 17 converts the voltage into resistance.

[0153] Figure 4 This is a graph showing the relationship between the resistance detected by corrosion sensor 11 and the elapsed time. The vertical axis represents the resistance value, and the horizontal axis represents the elapsed time.

[0154] like Figure 4 As shown, the resistance increases over time. The corrosion of the substrate sacrificial layer 14 proceeds over time, resulting in an increase in resistance.

[0155] Next, the processing unit 12 calculates the first cross-sectional area A1 of the cross section including the substrate 13 and the substrate sacrificial layer 14 based on the resistance measured by the corrosion sensor 11. The resistance value R is expressed by the following formula (1) using the resistivity ρ, the length l of the substrate sacrificial layer 14 and the first cross-sectional area A1.

[0156] [Formula 1]

[0157]

[0158] In Embodiment 1, the cross-sectional area ratio (A1 / A0) is calculated by taking the ratio of the first cross-sectional area A1 of the cross-section including the substrate 13 and the substrate sacrificial layer 14 to the second cross-sectional area A0 of the cross-section including the substrate 13 and the substrate sacrificial layer 14 before the refrigerant piping 6 is used. Further, the processing unit 12 estimates the lifespan of the refrigerant piping 6 from the time point T1 when the cross-sectional area ratio (A1 / A0) falls below the threshold S1.

[0159] Figure 5A This represents the relationship between the cross-sectional area ratio (A1 / A0) calculated from the resistance value measured by the corrosion sensor 11 and the elapsed time. Figure 5B Indicates from Figure 5A The relationship between the cross-sectional area ratio (A1 / A0) and the elapsed time after a certain period of time will be explained. Figure 5A and 5B The resistance value was measured under the following conditions. A refrigeration cycle unit 1, with an aluminum second heat exchanger 4, was installed in a typical residential house in Okinawa, and continuously operated to provide cooling at a room temperature set at 26°C. During this time, a 10mA DC current was applied to a corrosion sensor 11 installed in the second heat exchanger 4 at one-hour intervals to measure the resistance.

[0160] exist Figure 5A and Figure 5BThe threshold S1 is shown. In Embodiment 1, the thickness of the substrate 13 is 174 μm, and the thickness of the substrate sacrificial layer 14 is 16 μm. Furthermore, the widths of the substrate 13 and the substrate sacrificial layer 14 are the same. Therefore, the threshold S1 in Embodiment 1 is the ratio of the thickness of the substrate 13 to the thickness of the substrate sacrificial layer 14, which is 0.92. The time point T1 when the cross-sectional area ratio (A1 / A0) decreases to below 0.92, i.e., the time when the substrate sacrificial layer 14 disappears, is extrapolated to the lifespan of the refrigerant piping 6.

[0161] like Figure 5A As shown, based on information about the cross-sectional area ratio (A1 / A0) up to 150 days, an approximate formula for the cross-sectional area ratio (A1 / A0) is calculated using the least squares method, predicting the time T1 until the cross-sectional area ratio (A1 / A0) decreases below the threshold S1. Figure 5A In the middle, the lifespan of refrigerant piping 6 is predicted to be 215 days.

[0162] like Figure 5B As shown, the cross-sectional area ratio (A1 / A0) reaches the threshold S1 after 215 days. Therefore, it is shown that... Figure 5A The reasonableness of the calculation is thus established. Therefore, an approximate formula for the cross-sectional area ratio (A1 / A0) can be calculated to accurately predict the lifespan of the refrigerant piping 6.

[0163] [Effect]

[0164] According to embodiment 1, the refrigeration cycle device 1 can achieve the following effects.

[0165] The refrigeration cycle unit 1 includes a first heat exchanger 2, a compressor 3, a second heat exchanger 4, and an expansion mechanism 5. A refrigerant piping 6 connects the first heat exchanger 2, compressor 3, second heat exchanger 4, and expansion mechanism 5, circulating the refrigerant, which is primarily composed of aluminum. The outer surface of the refrigerant piping 6 has a sacrificial layer 7 that is inferior to the primary component of the refrigerant piping 6. The refrigeration cycle unit 1 also includes a corrosion sensor 11 and a processing unit 12. The corrosion sensor 11 is disposed around the refrigerant piping 6 to measure resistance. The processing unit 12 estimates the lifespan of the refrigerant piping 6 based on the change in resistance measured by the corrosion sensor 11.

[0166] This structure improves the accuracy of estimating the lifespan of the refrigerant piping 6. Specifically, because the corrosion sensor 11 is used to measure resistance, the lifespan of the refrigerant piping 6 is estimated based on the measured change in resistance, thus improving the accuracy of the lifespan estimation.

[0167] By placing the corrosion sensor 11 around the refrigerant piping 6, the accuracy of estimating the lifespan of the refrigerant piping 6 can be further improved. Specifically, by placing the corrosion sensor 11 around the refrigerant piping 6, the corrosive environment of the corrosion sensor 11 can be matched with the corrosive environment of the refrigerant piping 6. Thus, for example, the temperature of the corrosion sensor 11 is synchronized with the temperature of the refrigerant piping 6. Through temperature synchronization, the corrosion sensor 11 synchronizes with the relative humidity of the refrigerant piping 6. By reproducing the condensation on the refrigerant piping 6, the corrosion of the refrigerant piping 6 can be reproduced using the corrosion sensor 11, thereby improving the accuracy of estimating the lifespan of the refrigerant piping 6.

[0168] The refrigeration cycle unit 1 also includes a temperature sensor 19 that measures the ambient temperature of the corrosion sensor 11. The processing unit 12 corrects the resistance measured by the corrosion sensor 11 based on the temperature measured by the temperature sensor 19.

[0169] With this structure, the resistance measured by the corrosion sensor 11 can be corrected by the temperature around the corrosion sensor 11. By calculating the cross-sectional area ratio (A1 / A0) based on the corrected resistance value, the accuracy of estimating the life of the refrigerant piping 6 based on the cross-sectional area ratio (A1 / A0) can be further improved.

[0170] The corrosion sensor 11 includes a substrate 13, a substrate sacrificial layer 14, a power supply unit 15, a measuring unit 16, and a conversion unit 17. The substrate sacrificial layer 14 is disposed on the surface of the substrate 13, and its surface potential is lower than that of the substrate 13. The power supply unit 15 supplies a constant current to the substrate 13 and the substrate sacrificial layer 14. The measuring unit 16 measures the voltage applied to the substrate 13 and the substrate sacrificial layer 14. The conversion unit 17 converts the voltage measured by the measuring unit 16 into a resistance. The main components of the substrate 13 are the same as those of the refrigerant piping 6, and the main components of the substrate sacrificial layer 14 are the same as those of the sacrificial layer 7.

[0171] With this structure, the corrosion sensor 11 can measure the resistance of the substrate 13 and the substrate sacrificial layer 14, and estimate the life of the refrigerant piping 6 based on the change in resistance.

[0172] Furthermore, since the main components of the substrate sacrificial layer 14 and the sacrificial layer 7 are the same, the accuracy of estimating the lifespan of the refrigerant piping 6 can be further improved. In Embodiment 1, the substrate sacrificial layer 14 and the sacrificial layer 7 are formed of an aluminum-2wt% zinc alloy layer. Therefore, the material properties of the substrate sacrificial layer 14 and the sacrificial layer 7 are the same. As a result, the substrate sacrificial layer 14 can reproduce the corrosion of the sacrificial layer 7, and the lifespan of the refrigerant piping 6 can be estimated based on the formation of the corrosion portion 18 and the change in resistance caused by the corrosion of the substrate sacrificial layer 14. As a result, the accuracy of estimating the lifespan of the refrigerant piping 6 can be improved. In addition, since the substrate sacrificial layer 14 and the sacrificial layer 7 have the same material properties, such as the same surface water resistance, the substrate sacrificial layer 14 can reproduce the condensation condition of the sacrificial layer 7. Therefore, the detection accuracy of corrosion can be further improved.

[0173] The thickness of the substrate 13 is approximately the same as the thickness of the refrigerant piping 6, and the thickness of the substrate sacrificial layer 14 is approximately the same as the thickness of the sacrificial layer 7.

[0174] This structure further improves the accuracy of estimating the lifespan of the refrigerant piping 6. Specifically, since the thicknesses of the substrate 13 and the refrigerant piping 6, as well as the thicknesses of the substrate sacrificial layer 14 and the sacrificial layer 7, are approximately the same, the temperature and condensation conditions of the refrigerant piping 6 can be easily reproduced using the corrosion sensor 11. Therefore, the corrosion of the refrigerant piping 6 can be reproduced using the corrosion sensor 11, further improving the accuracy of lifespan estimation.

[0175] Furthermore, since the thicknesses of the substrate 13 and the refrigerant piping 6, as well as the thicknesses of the substrate sacrificial layer 14 and the sacrificial layer 7, are approximately the same, the corrosion process of the refrigerant piping 6 as the sacrificial layer 7 thins can be reproduced using the substrate sacrificial layer 14 and the substrate 13. The sacrificial layer 7 is consumed almost uniformly, but as the remaining sacrificial layer 7 decreases and exposes the underlying layer, a contact potential difference is generated due to the higher potential of the underlying layer, accelerating the consumption of the sacrificial layer 7 and the refrigerant piping 6. Therefore, by making the thicknesses of the substrate 13 and the refrigerant piping 6, as well as the thicknesses of the substrate sacrificial layer 14 and the sacrificial layer 7, approximately the same, the corrosion sensor 11 can reproduce the corrosion of the refrigerant piping 6, further improving the accuracy of lifespan estimation.

[0176] Substrate 13 and substrate sacrificial layer 14 are boards.

[0177] With this structure, the corrosion sensor 11 can be easily positioned at the desired location in the refrigeration cycle unit 1. For example, it can be secured to the outside of the second heat exchanger 4 using cable ties.

[0178] Based on the resistance measured by the corrosion sensor 11, the processing unit 12 periodically calculates the first cross-sectional area A1 of the cross-section including the substrate 13 and the substrate sacrificial layer 14. Based on the decreasing trend of the first cross-sectional area A1 due to corrosion, the lifespan of the refrigerant piping 6 is estimated.

[0179] Based on this structure, the lifespan of the refrigerant piping 6, which is mainly composed of aluminum, can be estimated based on the resistance measured by the corrosion sensor 11.

[0180] The processing unit 12 also calculates the cross-sectional area ratio (A1 / A0), which is the ratio of the first cross-sectional area A1 to the second cross-sectional area A0, which includes the cross-section of the substrate 13 and the substrate sacrificial layer 14 before the refrigerant piping 6 is used. The time point at which the cross-sectional area ratio (A1 / A0) decreases below a threshold is taken as the lifespan of the refrigerant piping 6.

[0181] Based on this structure, the lifespan of the refrigerant piping 6, which is mainly composed of aluminum, can be estimated based on the resistance measured by the corrosion sensor 11.

[0182] The threshold is the ratio of the cross-sectional area A2 of the substrate 13 to the second cross-sectional area A0.

[0183] With this structure, the time point when the substrate sacrificial layer 14 disappears can be estimated as the time point when the sacrificial layer 7 disappears, thus allowing for the estimation of the lifespan of the refrigerant piping 6. This further improves the estimation accuracy of the lifespan of the aluminum-based refrigerant piping 6.

[0184] Furthermore, since the refrigerant piping 6 will not corrode before the sacrificial layer 7 disappears, corrosion can be prevented before the refrigerant piping 6 corrodes by estimating the lifetime based on the threshold.

[0185] The processing unit 12 calculates an approximate formula for the cross-sectional area ratio (A1 / A0), and predicts the lifespan of the refrigerant piping 6 based on the approximate formula and the threshold S1.

[0186] With this structure, the lifespan of the refrigerant piping 6 can be predicted even if the cross-sectional area ratio (A1 / A0) is not continuously calculated until it decreases below the threshold S1. This reduces the power consumption of the corrosion sensor 11 and the processing unit 12.

[0187] The refrigeration cycle device 1 also includes a four-way valve 8 that changes the direction of refrigerant flow in the refrigerant piping 6.

[0188] With such a structure, such as the refrigeration cycle device 1 of embodiment 1, for example, the detection accuracy of corrosion of the air conditioner during cooling operation can be improved.

[0189] Furthermore, in Embodiment 1, an air conditioner for cooling operation was described as an example of the refrigeration cycle device 1, but it is not limited to this. For example, the refrigeration cycle device 1 could also be an air conditioner for heating operation. In addition, the refrigeration cycle device 1 could also be a refrigeration device such as a cold storage room.

[0190] In Embodiment 1, an example is described in which the refrigerant piping 6 is configured to connect the first heat exchanger 2, the compressor 3, the four-way valve 8, the second heat exchanger 4, and the expansion mechanism 5. However, the refrigerant piping 6 may be connected to other elements such as a liquid accumulator and a valve.

[0191] In Embodiment 1, an example was described where the corrosion sensor 11 was fixed to the fins 21 of the second heat exchanger 4 around the refrigerant pipe 6, but the embodiment is not limited thereto. The corrosion sensor 11 can be disposed on at least one of the outer surface of the refrigerant pipe 6 and around the refrigerant pipe 6. The corrosion sensor 11 can be disposed on the outer surface of the refrigerant pipe 6. By contacting the corrosion sensor 11 with the refrigerant pipe 6, the temperature of the corrosion sensor 11 can be synchronized with that of the refrigerant pipe 6.

[0192] Alternatively, the corrosion sensor 11 can be positioned on the outer surface of a dummy pipe that is located around the refrigerant piping 6 and does not pass through the refrigerant. By positioning the dummy pipe near the refrigerant piping 6, the temperature of the corrosion sensor 11 can be synchronized with that of the refrigerant piping 6.

[0193] In Embodiment 1, an example was described where the corrosion sensor 11 was disposed around the refrigerant piping 6 of the second heat exchanger 4, but this is not a limitation. The corrosion sensor 11 may be disposed on the refrigerant piping 6 of at least one of the first heat exchanger 2 and the second heat exchanger 4. For example, the corrosion sensor 11 may be disposed on the outer surface of the refrigerant piping 6 of the second heat exchanger 4. Alternatively, the corrosion sensor 11 may be disposed on the refrigerant piping 6 of both the first heat exchanger 2 and the second heat exchanger 4.

[0194] Alternatively, the corrosion sensor 11 can be configured in other parts of the refrigerant piping 6.

[0195] In Embodiment 1, an example of a refrigeration cycle device 1 including a corrosion sensor 11 was described, but the device is not limited thereto. The refrigeration cycle device 1 may include one or more corrosion sensors 11.

[0196] In Embodiment 1, an example was described where the main component of the substrate 13 is aluminum, but the embodiment is not limited thereto. The material forming the substrate 13 can be any material having a higher surface potential than the substrate sacrificial layer 14. Furthermore, the material forming the substrate 13 can be any material capable of reproducing the corrosion of the refrigerant piping 6.

[0197] In Embodiment 1, an example was described where the power supply unit 15 provides a constant current and the measuring unit 16 measures the voltage applied to the substrate 13 and the substrate sacrificial layer 14, but this is not a limitation. Alternatively, the power supply unit 15 may apply a constant voltage to the substrate 13 and the substrate sacrificial layer 14, and the measuring unit 16 may measure the current. In this case, the conversion unit 17 divides the voltage applied by the power supply unit 15 by the current measured by the measuring unit 16 to calculate the resistance of the substrate 13 and the substrate sacrificial layer 14.

[0198] In Embodiment 1, an example was described where the lifespan of the refrigerant piping 6 was estimated based on the first cross-sectional area A1 of the cross-section including the substrate 13 and the substrate sacrificial layer 14, and the cross-sectional area ratio (A1 / A0), but this is not a limitation. For example, the lifespan of the refrigerant piping 6 can be estimated based on the thickness of the substrate sacrificial layer 14. Specifically, when the substrate sacrificial layer 14 corrodes, a corroded portion 18 is formed. As a result, the thickness of the substrate sacrificial layer 14 decreases. The lifespan of the refrigerant piping 6 can be estimated based on the change in resistance caused by the decrease in the thickness of the substrate sacrificial layer 14.

[0199] In Embodiment 1, it was described that the threshold S1 is the ratio of the first cross-sectional area A1 to the second cross-sectional area A0, an example of the cross-sectional area ratio (A1 / A0), but it is not limited to this. The threshold S1 can be less than or greater than the cross-sectional area ratio (A1 / A0). For example, by making the threshold S1 greater than the cross-sectional area ratio (A1 / A0), the lifespan of the refrigerant piping 6 can be estimated before the substrate sacrificial layer 14 disappears. Furthermore, if the threshold S1 is greater than the cross-sectional area ratio (A1 / A0), and the thickness of the substrate sacrificial layer 14 is less than the thickness of the sacrificial layer 7, the lifespan of the refrigerant piping 6 can be estimated more safely before the sacrificial layer 7 disappears. By estimating the lifespan of the refrigerant piping 6 more safely, corrosion of the refrigerant piping 6 can be dealt with more reliably before it penetrates. On the other hand, by making the threshold S1 less than the cross-sectional area ratio (A1 / A0), the refrigerant piping 6 can be used for a longer period of time.

[0200] In Embodiment 1, an example of temperature sensor 19 being independent of corrosion sensor 11 was described, but the embodiment is not limited thereto. Temperature sensor 19 may be integrated into corrosion sensor 11. Furthermore, temperature sensor 19 may be integrated into processing unit 12.

[0201] In Embodiment 1, an example of a corrosion sensor 11 having a temperature sensor 19 was described, but it is not limited thereto. For example, as in Modification 1 described later, instead of the temperature sensor 19, an RCM (resistive corrosion monitoring) sensor 30 having a reference section 31 can be used as the corrosion sensor 11.

[0202] (Variation Example 1)

[0203] Figure 6This is a schematic diagram of an RCM sensor 30. The RCM sensor 30 has a substrate sacrificial layer 14, a substrate 13 (not shown because it is located below the substrate sacrificial layer 14), a wire 20, and a reference portion 31. The wire 20 forms an independent circuit with the substrate 13 and the reference portion 31.

[0204] The reference section 31 has a substrate 13A and a substrate sacrificial layer 14A symmetrical to the substrate 13 and the substrate sacrificial layer 14, and a protective layer 33 is provided on the substrate sacrificial layer 14A. The substrate 13A is not shown because it is located below the substrate sacrificial layer 14A. Since the RCM sensor 30 has a protective layer 33, the substrate sacrificial layer 14A of the reference section 31 will not be corroded away.

[0205] By using the reference section 31, the temperature dependence of resistivity can be eliminated. Specifically, by taking the ratio of the resistance measured at the substrate 13 and the substrate sacrificial layer 14 to the resistance measured at the reference section 31, the effect of temperature-dependent resistivity can be eliminated.

[0206] The protective layer 33 is in close contact with the substrate sacrificial layer 14A. For example, the protective layer 33 is resin.

[0207] This structure eliminates the temperature dependence of resistivity, enabling easy and accurate measurement of the resistance of the substrate 13 and the substrate sacrificial layer 14. Therefore, the accuracy of estimating the lifespan of the refrigerant piping 6 can be further improved. Furthermore, the reduction in the number of temperature sensors 19 in the corrosion sensor 11 allows for space savings.

[0208] (Implementation Method 2)

[0209] The refrigeration cycle apparatus of Embodiment 2 of this disclosure will be described. Furthermore, in Embodiment 2, the differences from Embodiment 1 will be mainly explained. In Embodiment 2, structures that are the same as or equivalent to those in Embodiment 1 will be described using the same reference numerals. Additionally, in Embodiment 2, descriptions that are repeated in Embodiment 1 will be omitted.

[0210] Figure 7 This is a schematic diagram of the corrosion sensor 11A according to Embodiment 2 of this disclosure.

[0211] In Embodiment 2, unlike Embodiment 1, in the corrosion sensor 11A, the substrate 13 is formed from a portion of the refrigerant piping 6, and the substrate sacrificial layer 14 is formed from a portion of the sacrificial layer 7.

[0212] In Embodiment 2, the refrigeration cycle device 1 is the same as in Embodiment 1 unless otherwise specified.

[0213] like Figure 7As shown, the substrate 13 of the corrosion sensor 11A is formed from a portion of the refrigerant piping 6, and the wire 20 is connected to the substrate 13. The refrigerant piping 6 forming the substrate 13 can be bent. For example, the refrigerant piping 6 forming the substrate 13 can be the refrigerant piping 6 configured in the second heat exchanger 4.

[0214] The substrate sacrificial layer 14 is formed by a portion of the sacrificial layer 7 and is disposed on the outer surface of the substrate 13. In Embodiment 2, the thickness of the substrate sacrificial layer 14 is constant in the peripheral direction of the substrate 13.

[0215] [Effect]

[0216] The substrate 13 is formed from a portion of the refrigerant piping 6, and the substrate sacrificial layer 14 is formed from a portion of the sacrificial layer 7.

[0217] This structure allows for direct measurement of the resistance of the sacrificial layer 7, further improving the accuracy of estimating the lifespan of the refrigerant piping 6. In Embodiment 2, the corrosion sensor 11A can directly estimate the lifespan of the refrigerant piping 6. Furthermore, it reduces the number of components, saving space.

[0218] Furthermore, in Embodiment 2, an example was described where the thickness of the substrate sacrificial layer 14 is constant in the outer peripheral direction of the substrate 13, but this is not a limitation. The thickness of the substrate sacrificial layer 14 can vary in the outer peripheral direction of the substrate 13. In this case, when calculating the cross-sectional area of ​​the substrate 13 and the substrate sacrificial layer 14 based on resistance, the average thickness of the substrate sacrificial layer 14 is used. For example, by spraying the substrate sacrificial layer 14 onto the substrate 13, the thickness of the substrate sacrificial layer 14 varies in the outer peripheral direction of the substrate 13.

[0219] In Embodiment 2, an example is described where the refrigeration cycle device 1 includes a corrosion sensor 11A, but it is not limited thereto. The refrigeration cycle device 1 may include one or more corrosion sensors 11A.

[0220] In Embodiment 2, an example of the refrigerant piping 6 having a cylindrical shape was described, but it is not limited to this. For example, the refrigerant piping 6 may have a square cylindrical shape. In this case, the corrosion sensor 11A may be formed from one side of the square cylindrical shape of the refrigerant piping 6. That is, the corrosion sensor 11A may be plate-shaped.

[0221] (Implementation Method 3)

[0222] The refrigeration cycle apparatus of Embodiment 3 of this disclosure will be described. Furthermore, in Embodiment 3, the differences from Embodiment 1 will be mainly explained. In Embodiment 3, structures that are the same as or equivalent to those in Embodiment 1 will be described using the same reference numerals. Additionally, in Embodiment 3, descriptions that are repeated in Embodiment 1 will be omitted.

[0223] Figure 8 This is a block diagram of the refrigeration cycle apparatus 1A according to Embodiment 3 of this disclosure.

[0224] In Embodiment 3, the difference from Embodiment 1 is that the refrigeration cycle device 1A has a display unit 32.

[0225] In Embodiment 3, unless otherwise specified, the refrigeration cycle device 1A is the same as the refrigeration cycle device 1 in Embodiment 1.

[0226] Display unit 32 displays the estimated lifespan of refrigerant piping 6 calculated by processing unit 12. Display unit 32 can simultaneously display the estimated lifespan of refrigerant piping 6 and the time elapsed from the time of display to the estimated lifespan of refrigerant piping 6.

[0227] The display unit 32 includes a display, a communication unit, a memory for storing programs, and processing circuitry (not shown) corresponding to a processor such as a CPU (central processing unit). The processor can function as these elements by executing programs. Furthermore, corresponding to the communication unit of the display unit 32, the processing unit 12 also has a communication unit.

[0228] The communication unit of processing unit 12 transmits the estimated lifespan result. The communication unit of display unit 32 receives the estimated lifespan result of processing unit 12. The communication unit of display unit 32 and processing unit 12 includes circuitry that transmits data to display unit 32 according to a specified wireless communication standard (e.g., LAN, Wi-Fi, Bluetooth).

[0229] The display shows the estimated lifespan. The display is positioned in a location visible to the user of the refrigeration cycle unit 1A. For example, the display is located on the outside of the indoor unit 9.

[0230] [Effect]

[0231] The display unit 32 displays the lifespan of the refrigerant piping 6 calculated by the processing unit 12.

[0232] This structure allows the estimated lifespan of the refrigerant piping 6 to be displayed to the user of the refrigeration cycle unit 1A. Therefore, by notifying the user of the necessity for replacing or repairing the refrigerant piping 6, the refrigerant piping 6 can be addressed before it is damaged.

[0233] Furthermore, in Embodiment 3, an example was described where the refrigeration cycle device 1A includes a display unit 32, but this is not a limitation. The display unit 32 may not be included in the constituent elements of the refrigeration cycle device 1A. The display unit 32 may be a display independent of the refrigeration cycle device 1A. For example, the display of the remote control for the refrigeration cycle device 1A can function as the display unit 32. The refrigeration cycle device 1A transmits the lifespan calculation result information to the remote control via a communication unit. The remote control can receive the lifespan calculation result information via the communication unit and display the lifespan calculation result on the remote control's display. In addition, the display of a smartphone can function as the display unit 32. Specifically, the communication unit of the refrigeration cycle device 1A can communicate with a smartphone and display the lifespan calculation result on the smartphone. For example, an application corresponding to the refrigeration cycle device 1A can be set on the smartphone, and the lifespan calculation result can be displayed on the smartphone through this application.

[0234] Furthermore, the display unit 32 is not limited to a visual display; it can be a speaker that emits an alarm sound. For example, the display unit 32 can sound an alarm sound when the refrigerant piping 6 reaches the end of its service life.

[0235] In Embodiment 3, an example was described where the display showed the estimated lifespan of the refrigerant piping 6, but the embodiment is not limited to this. The display unit 32 can display other information. For example, the display unit 32 can also display the estimated lifespan of the refrigerant piping 6 and the thickness of the sacrificial layer 7.

[0236] In Embodiment 3, an example of the processing unit 12 communicating according to a wireless communication standard was described, but it is not limited thereto. The processing unit 12 can communicate via a wired communication standard. For example, the processing unit 12 can communicate via USB, HDMI (registered trademark), and SPI (Serial Peripheral Interface).

[0237] In Embodiment 3, an example including the display unit 32 in Embodiment 1 was described, but the embodiment is not limited thereto. The display unit 32 may also be included in Embodiment 2 and Modification 1.

[0238] (Implementation Method 4)

[0239] The refrigeration cycle system 41 of Embodiment 4 of this disclosure will be described. Furthermore, in Embodiment 4, the differences from Embodiment 1 will be mainly explained. In Embodiment 4, structures that are the same as or equivalent to those in Embodiment 1 will be described using the same reference numerals. Additionally, in Embodiment 4, descriptions that are repeated in Embodiment 1 will be omitted.

[0240] Figure 9 This is a block diagram of the refrigeration cycle system 41 according to Embodiment 4 of this disclosure.

[0241] In Embodiment 4, the difference from Embodiment 1 is that a refrigeration cycle system 41 including a refrigeration cycle device 1B is used.

[0242] In Embodiment 4, unless otherwise specified, the refrigeration cycle device 1B is the same as the refrigeration cycle device 1 in Embodiment 1.

[0243] [Overall Structure]

[0244] like Figure 9 As shown, the refrigeration cycle system 41 includes a refrigeration cycle device 1B and a processing device 51.

[0245] Refrigeration Cycle Device

[0246] The refrigeration cycle device 1B includes a first heat exchanger 2, a compressor 3, a second heat exchanger 4, an expansion mechanism 5, a refrigerant piping 6, a corrosion sensor 11, a storage unit 42, and a first communication unit 43.

[0247] Storage Department

[0248] The storage unit 42 stores information about the resistance of the substrate 13 and the substrate sacrificial layer 14 measured by the corrosion sensor 11. The storage unit 42 can be, for example, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, DVD or other optical disc storage, magnetic tape cassette, magnetic tape, disk storage or other magnetic storage devices.

[0249] <1st Communications Department>

[0250] The first communication unit 43 transmits information stored in the storage unit 42 via a network. Specifically, the first communication unit 43 transmits resistance information to the processing device 51 via the network. The first communication unit 43 includes circuitry that transmits information to the second communication unit 53 of the processing device 51 according to a specified communication standard (e.g., LAN, Wi-Fi, Bluetooth).

[0251] <Processing Device>

[0252] The processing device 51 includes a processing unit 12 and a second communication unit 53. The processing device 51 is a computer. For example, the processing device 51 is a server or a cloud.

[0253] <Second Communications Department>

[0254] The second communication unit 53 receives resistance information transmitted by the first communication unit 43 via a network. The second communication unit 53 includes circuitry that receives information from the first communication unit 43 of the refrigeration cycle device 1B according to a specified communication standard (e.g., LAN, Wi-Fi, Bluetooth).

[0255] Based on the resistance information received by the second communication unit 53, the processing unit 12 calculates the lifespan of the refrigerant piping 6.

[0256] [action]

[0257] In the refrigeration cycle unit 1B, the resistance is measured by the corrosion sensor 11, and the resistance information is stored in the storage unit 42. The first communication unit 43 sends the resistance information stored in the storage unit 42 to the second communication unit 53. In the processing unit 51, the second communication unit 53 receives the resistance information. Based on the resistance information received by the second communication unit 53, the processing unit 12 calculates the lifespan of the refrigerant piping 6 of the refrigeration cycle unit 1B.

[0258] [Effect]

[0259] A refrigeration cycle system 41 of this disclosure includes a refrigeration cycle device 1B and a processing device 51. The refrigeration cycle device 1B includes a first heat exchanger 2, a compressor 3, a second heat exchanger 4, and an expansion mechanism 5. The processing device 51 communicates with the refrigeration cycle device 1B via a network. The refrigeration cycle device 1B also includes a refrigerant piping 6, a corrosion sensor 11, a storage unit 42, and a first communication unit 43. The refrigerant piping 6 connects the first heat exchanger 2, the compressor 3, the second heat exchanger 4, and the expansion mechanism 5, circulating refrigerant, and is primarily composed of aluminum. The refrigerant piping 6 has a sacrificial layer 7 on its outer surface that is inferior to the primary component of the refrigerant piping 6. The corrosion sensor 11 is disposed on at least one of the outer surface of the refrigerant piping 6 and the surrounding area of ​​the refrigerant piping 6, measuring resistance. The storage unit 42 stores information about the resistance detected by the corrosion sensor 11. The first communication unit 43 transmits the resistance information stored in the storage unit 42 via the network. The processing unit 51 includes a second communication unit 53 and a processing unit 12. The second communication unit 53 receives resistance information via a network. The processing unit 12 calculates the lifespan of the refrigerant piping 6 based on changes in resistance.

[0260] This structure improves the accuracy of lifespan estimation for the refrigerant piping 6 in the refrigeration cycle unit 1B and enables the transmission of resistance information detected by the corrosion sensor 11 from the refrigeration cycle unit 1B to other devices. Specifically, the resistance information measured by the corrosion sensor 11 can be transmitted to a processing unit 51 independent of the refrigeration cycle unit 1B. For example, if the seller has a processing unit 51, maintenance services can be provided based on lifespan estimations performed by the processing unit 12. Therefore, it is possible to suppress the occurrence of malfunctions in the refrigeration cycle unit 1B, improve the efficiency of maintenance services, and increase user satisfaction.

[0261] In addition, the processing device 51 can receive information from multiple refrigeration cycle devices 1B.

[0262] While the invention has been fully described with reference to the accompanying drawings and preferred embodiments, various modifications and variations will be apparent to those skilled in the art. These modifications and variations should be understood to be included therein without departing from the scope of the invention as defined in the appended claims.

[0263] Industrial availability

[0264] The refrigeration cycle device and refrigeration cycle system disclosed herein can improve the accuracy of estimating the lifespan of refrigerant piping with aluminum as the main component, and are therefore useful as air conditioners.

[0265] Explanation of reference numerals in the attached figures

[0266] 1. Refrigeration cycle unit, 1A, 1B

[0267] 2. First heat exchanger

[0268] 3. Compressor

[0269] 4. Second heat exchanger

[0270] 5. Expansion Mechanism

[0271] 6, 6a, 6b Refrigerant piping

[0272] 7. Sacrificial Layer

[0273] 8 Four-way valve

[0274] 9 Indoor Unit

[0275] 10 Outdoor Units

[0276] 11, 11A Corrosion Sensor

[0277] 12 Processing Department

[0278] 13, 13A Substrate

[0279] 14, 14A Substrate Sacrificial Layer

[0280] 15 Power Supply Section

[0281] 16. Measurement Department

[0282] 17. Conversion Section

[0283] 18 Corrosion Section

[0284] 19 Temperature Sensor

[0285] 20 wires

[0286] 21 Fins

[0287] 30 RCM sensor

[0288] 31 Reference Section

[0289] 32 Display Section

[0290] 33 Protective Layer

[0291] 41 Refrigeration Cycle System

[0292] 42 Storage Section

[0293] 43 1st Communications Department

[0294] 51 Processing device

[0295] 53 2nd Communications Department.

Claims

1. A refrigeration cycle device, comprising a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism, characterized in that, have: The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum. A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and The processing unit, based on the change in resistance measured by the corrosion sensor, estimates the lifespan of the refrigerant piping. The refrigerant piping has a sacrificial layer on its outer surface that is lower than the main component of the refrigerant piping. The corrosion sensor includes: Substrate; A substrate sacrificial layer is disposed on the surface of the substrate, and its surface potential is lower than that of the substrate. A constant current flows to the power supply section of the substrate and the substrate sacrificial layer; A measuring unit that measures the voltage applied to the substrate and the substrate sacrificial layer; and The conversion unit converts the voltage measured by the measuring unit into a resistance. The main component of the substrate is the same as the main component of the refrigerant piping. The principal component of the substrate sacrificial layer is the same as the principal component of the sacrificial layer. The thickness of the substrate sacrificial layer is smaller than the thickness of the sacrificial layer.

2. The refrigeration cycle device as described in claim 1, characterized in that: It also includes a temperature sensor that measures the temperature around the corrosion sensor. The processing unit corrects the resistance measured by the corrosion sensor based on the temperature measured by the temperature sensor.

3. The refrigeration cycle device as described in claim 1, characterized in that: The corrosion sensor is configured in the refrigerant piping of at least one of the first heat exchanger and the second heat exchanger.

4. The refrigeration cycle device as described in claim 1, characterized in that: The thickness of the substrate is approximately the same as the thickness of the refrigerant piping.

5. The refrigeration cycle device as described in claim 1, characterized in that: The substrate and the substrate sacrificial layer are sheet materials.

6. The refrigeration cycle device as described in claim 1, characterized in that: The processing unit periodically calculates the first cross-sectional area of ​​the cross-section including the substrate and the substrate sacrificial layer based on the resistance measured by the corrosion sensor. The lifespan of the refrigerant piping is estimated based on the decreasing trend of the first cross-sectional area due to corrosion.

7. The refrigeration cycle device as described in claim 6, characterized in that: The processing unit further Calculate the cross-sectional area ratio, which is the ratio of the first cross-sectional area to the second cross-sectional area of ​​the substrate and the substrate sacrificial layer before use, including the refrigerant piping. The time point at which the cross-sectional area ratio decreases below the threshold is taken as the lifespan of the refrigerant piping.

8. The refrigeration cycle device as described in claim 7, characterized in that: The threshold is the ratio of the cross-sectional area of ​​the substrate to the second cross-sectional area.

9. The refrigeration cycle device as described in claim 7, characterized in that: The processing unit calculates an approximate formula for the cross-sectional area ratio, and estimates the lifespan of the refrigerant piping based on the approximate formula and the threshold.

10. The refrigeration cycle apparatus as described in claim 1, characterized in that: It also includes a display unit that displays the lifespan of the refrigerant piping calculated by the processing unit.

11. The refrigeration cycle apparatus according to any one of claims 1 to 10, characterized in that: It also includes a four-way valve, which changes the direction of the refrigerant flow within the refrigerant piping.

12. The refrigeration cycle device as claimed in claim 1, characterized in that: The first heat exchanger and the second heat exchanger have fins, and the refrigerant piping passes through the fins. The corrosion sensor is disposed on at least one fin of the first heat exchanger and the second heat exchanger.

13. A refrigeration cycle system, characterized in that, include: A refrigeration cycle device, comprising a first heat exchanger, a compressor, a second heat exchanger, and an expansion mechanism; and The processing device communicates with the refrigeration cycle unit via a network. The refrigeration cycle device has: The refrigerant piping connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion mechanism to circulate the refrigerant, and is primarily composed of aluminum. A corrosion sensor, disposed on at least one of the outer surface of the refrigerant piping and around the refrigerant piping, is used to measure resistance; and The storage unit stores information about the resistance measured by the corrosion sensor; and The first communication unit transmits information about the resistor stored in the storage unit via the network. The refrigerant piping has a sacrificial layer on its outer surface that is lower than the main component of the refrigerant piping. The processing device has: The second communication unit receives information about the resistor via the network; and The processing unit calculates the lifespan of the refrigerant piping based on the change in resistance. The corrosion sensor includes: Substrate; A substrate sacrificial layer is disposed on the surface of the substrate, and its surface potential is lower than that of the substrate. A constant current flows to the power supply section of the substrate and the substrate sacrificial layer; A measuring unit that measures the voltage applied to the substrate and the substrate sacrificial layer; and The conversion unit converts the voltage measured by the measuring unit into a resistance. The main component of the substrate is the same as the main component of the refrigerant piping. The principal component of the substrate sacrificial layer is the same as the principal component of the sacrificial layer. The thickness of the substrate sacrificial layer is smaller than the thickness of the sacrificial layer.

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