JPWO2017130402A1 - Dehumidifier - Google Patents

Abstract

When the first condition based on the evaporator temperature is satisfied, the dehumidifier switches from the first state to the second state, or from the second state to the first state, and changes to the condenser temperature. If the second condition is satisfied, the operation is stopped and the first condition is satisfied from the first state even if the first condition is satisfied for a certain period after it is determined that the first condition is satisfied. Switching to the state and switching from the second state to the first state are not performed.

Description

  The present invention relates to a dehumidifying device, and more particularly to a dehumidifying device capable of defrosting by switching a flow path switching device.

  As a method for melting the frost of the heat exchanger, there are a method in which the operation is stopped and natural melting is used, and a method in which the discharged refrigerant is directly flowed to the evaporator to melt the frost.

  Here, by switching the flow path switching device, the high-temperature refrigerant discharged from the compressor is supplied to the heat exchanger that functioned as the evaporator before switching the flow path switching device, so that the frost of the heat exchanger There has been proposed a dehumidifying device that dissolves (see, for example, Patent Document 1). When frost is formed on the heat exchanger, the air volume is reduced and the heat exchange amount in the evaporator is reduced. For this reason, it can be determined that there is frost formation by reducing the temperature difference between the inlet temperature and the outlet temperature of the evaporator.

International Publication No. 2015/125251

When the amount of heat exchange in the evaporator decreases, the refrigerant becomes difficult to gasify in the evaporator. For this reason, the amount of the liquid refrigerant that returns to the compressor increases, which may lead to a failure of the compressor. Here, there are various causes for the decrease in the amount of heat exchange in the evaporator. As described above, in addition to the case where frost is formed on the evaporator, there are cases where it is difficult to supply air to the evaporator due to clogging of a filter that captures dust or the like disposed in the air passage.
The tendency of the temperature difference between the inlet temperature and the outlet temperature of the evaporator is the same whether the evaporator is frosted or the filter is clogged. For this reason, data (refrigerant temperature data, etc.) other than the inlet temperature and outlet temperature of the evaporator is required to distinguish between the case where the evaporator is frosted and the case where the filter is clogged.

When frost forms on the evaporator, the temperature difference between the inlet temperature and the outlet temperature of the evaporator becomes small, and it is determined that defrosting is necessary, and the flow path switching device can be switched. And a high temperature refrigerant | coolant is supplied to an evaporator, frost is removed, the temperature difference of the inlet_port | entrance temperature and outlet temperature of an evaporator opens, and it can determine with the dehumidifier having eliminated the malfunction.
On the other hand, even when the filter is clogged or the like, the temperature difference between the inlet temperature and the outlet temperature of the evaporator becomes small, and it is determined that defrosting is necessary, and the flow path switching device is switched. However, when the flow path switching device is switched, clogging of the filter is not corrected, so that the problem is not eliminated at all. Even if the flow path switching device is switched, the temperature difference between the inlet temperature and the outlet temperature of the evaporator remains small, so it is determined that defrosting is necessary again. That is, the flow path switching device is frequently switched.

  Here, if the refrigerant temperature is used in determining the case of filter clogging or the like, if the flow path switching device is frequently switched, the data becomes unstable accordingly. For this reason, the determination accuracy in the case of clogging of the filter or the like is lowered.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a dehumidifying device capable of avoiding deterioration in determination accuracy of defects other than defrosting.

  A dehumidifying device according to the present invention is a dehumidifying device including a refrigerant circuit, and is disposed in an air path through which air taken in from the space to be dehumidified flows, a blower that takes air in the space to be dehumidified into the air path, and the air path. Adsorption of moisture contained in the air and a moisture adsorption part for desorbing the adsorbed moisture to the air, a compressor included in the refrigerant circuit, and an upstream of the moisture adsorption part of the air passage, included in the refrigerant circuit A first heat exchanger that functions as an evaporator or a condenser, and a second heat exchange that is disposed downstream of the moisture adsorbing portion of the air passage and is included in the refrigerant circuit and functions as a condenser or an evaporator. And the expansion device included in the refrigerant circuit and connected between the first heat exchanger and the second heat exchanger, and the first heat exchanger functions as an evaporator and the second A first state in which the heat exchanger functions as a condenser and a first heat exchange; A flow path switching device included in the refrigerant circuit, and a refrigerant temperature of the evaporator and the condenser, which switches between a second state in which the condenser functions as a condenser and the second heat exchanger functions as an evaporator. A temperature detection unit, and a control device that controls the compressor, the blower, and the flow path switching device based on the detection result of the temperature detection unit, and the control device satisfies the first condition based on the temperature of the evaporator In this case, when switching from the first state to the second state, or from the second state to the first state, and at least satisfying the second condition based on the temperature of the condenser, the operation is stopped, Even if the first condition is satisfied for a certain period after it is determined that the first condition is satisfied, switching from the first state to the second state, and from the second state to the first state It is configured not to switch to the state That.

  According to the dehumidifying apparatus of the present invention, since the above-described configuration is provided, it is possible to avoid a reduction in the accuracy of determination of defects other than defrosting.

It is a figure which shows the refrigerant circuit etc. of the dehumidification apparatus which concerns on embodiment of this invention. It is a block diagram of the control apparatus of the dehumidification apparatus which concerns on embodiment of this invention. It is explanatory drawing of the defrost determination and protection stop determination of the dehumidification apparatus which concerns on embodiment of this invention. It is a figure explaining the 2nd state of the dehumidification apparatus which concerns on embodiment of this invention. It is modification 1 of the dehumidification apparatus which concerns on embodiment of this invention. It is the modification 2 of the dehumidification apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of a dehumidifying apparatus according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

Embodiment.
FIG. 1 is a diagram illustrating a refrigerant circuit A and the like of the dehumidifying apparatus 100 according to the present embodiment.
FIG. 2 is a configuration diagram of the control device 4 of the dehumidifying device 100 according to the present embodiment.
FIG. 3 is an explanatory diagram of defrosting determination and protection stop determination of the dehumidifying apparatus 100 according to the present embodiment.

  In the dehumidifying device 100, the flow path switching device 15 can switch between the first state and the second state. Here, the flow path configuration of the refrigerant circuit A of the dehumidifier 100 is different between the first state and the second state, but dehumidification is possible in any state. The dehumidifier 100 switches the first state to the second state, or switches from the second state to the first state, thereby causing the heat exchanger functioning as an evaporator to function as a condenser, Defrosting can be performed. The flow path switching device 15 shown in FIG. 1 is in the first state.

[Description of configuration]
The dehumidifying device 100 includes a compressor 13 that compresses refrigerant, a first heat exchanger 11a and a second heat exchanger 11b that function as a condenser or an evaporator, and a third heat exchanger that functions as a condenser. 11c, a throttle device 14 for decompressing the condensed refrigerant, and a flow path switching device 15 for switching the refrigerant flow path. The compressor 13, the first heat exchanger 11a, the second heat exchanger 11b, the third heat exchanger 11c, the expansion device 14 and the flow path switching device 15 are connected by a refrigerant pipe. In the following description, the first heat exchanger 11a, the second heat exchanger 11b, and the third heat exchanger 11c may be collectively referred to as the heat exchanger 11.

  The refrigerant piping of the dehumidifier 100 includes the refrigerant piping P1 to the refrigerant piping P7. The refrigerant pipe P1 connects the discharge part of the compressor 13 and the third heat exchanger 11c. The refrigerant pipe P2 connects the third heat exchanger 11c and the flow path switching device 15. The refrigerant pipe P3 connects the flow path switching device 15 and the second heat exchanger 11b. The refrigerant pipe P4 connects the second heat exchanger 11b and the expansion device 14. The refrigerant pipe P5 connects the throttle plate 14 and the first heat exchanger 11a. The refrigerant pipe P6 connects the first heat exchanger 11a and the flow path switching device 15. The refrigerant pipe P7 connects the flow path switching device 15 and the suction portion of the compressor 13.

  The dehumidifier 100 includes a moisture adsorption unit 16 that performs adsorption and desorption of moisture, and a blower 12 that supplies air to the heat exchanger 11 and the moisture adsorption unit 16. In addition, in this Embodiment, although the air blower 12 is arrange | positioned in the downstream of an air path rather than the 3rd heat exchanger 11c, it is not limited to it, For example, from the 1st heat exchanger 11a. Or upstream.

  The dehumidifying apparatus 100 includes a temperature sensor 1e, a temperature sensor 1f, a temperature sensor 1g, and a temperature sensor 1h that are used to detect the temperature of the refrigerant. In the following description, the temperature sensor 1e, the temperature sensor 1f, the temperature sensor 1g, and the temperature sensor 1h may be collectively referred to as a temperature detection unit S. The dehumidifying device 100 includes a control device 4 that switches the flow path switching device 15 based on the detection result of the temperature detection unit S, and a memory Me that stores various data.

  The dehumidifier 100 includes an air passage 50 in which at least the heat exchanger 11 and the moisture adsorption unit 16 are installed. In the air passage 50, a suction port 50A is formed at the most upstream portion, and an outlet 50B is formed at the most downstream portion. In FIG. 1, the air flow in the air passage 50 is indicated by solid line arrows (Air1 to Air5). The air in the dehumidification target space is taken into the air passage 50 and dehumidified, and then blown out into the dehumidification target space. The dehumidifying target space is, for example, a room.

(Compressor 13)
The compressor 13 has a discharge part connected to the third heat exchanger 11 c and a suction part connected to the flow path switching device 15. For example, the compressor 13 may be a positive displacement compressor driven by a motor (not shown). The number of compressors 13 is not limited to one, but two or more compressors may be connected in parallel or in series.

(Heat exchanger 11)
One end of the first heat exchanger 11 a and the second heat exchanger 11 b is connected to the expansion device 14, and the other end is connected to the flow path switching device 15. That is, the first heat exchanger 11a, the expansion device 14, and the second heat exchanger 11b are connected in series. The third heat exchanger 11 c has one end connected to the discharge unit of the compressor 13 and the other end connected to the flow path switching device 15. In addition, the 1st heat exchanger 11a, the 2nd heat exchanger 11b, and the 3rd heat exchanger 11c are arrange | positioned in order from the upstream of the air flow direction. The heat exchanger 11 may be constituted by, for example, a cross fin type fin-and-tube heat exchanger constituted by heat transfer tubes and a large number of fins. The first heat exchanger 11a includes a header Hd1 that distributes the refrigerant, and the second heat exchanger 11b also includes a header Hd2 that distributes the refrigerant. The header Hd1 and the header Hd2 are connected to the heat transfer tubes of each heat exchanger.

  The 1st heat exchanger 11a is arrange | positioned upstream from the water | moisture-content adsorption | suction part 16 of the air path 50, is contained in the refrigerant circuit A, and functions as an evaporator or a condenser. The 2nd heat exchanger 11b is arrange | positioned downstream from the water | moisture-content adsorption | suction part 16 of the air path 50, is contained in the refrigerant circuit A, and functions as a condenser or an evaporator. The third heat exchanger 11c is disposed downstream of the air passage 50 with respect to the second heat exchanger 11b, is included in the refrigerant circuit A, and functions as a condenser.

(Aperture device 14)
The expansion device 14 decompresses the refrigerant and is included in the refrigerant circuit A. The expansion device 14 has one end connected to the first heat exchanger 11a and the other end connected to the second heat exchanger 11b. That is, the expansion device 14 is connected between the first heat exchanger 11a and the second heat exchanger 11b. The expansion device 14 can adjust the flow rate of the refrigerant flowing in the refrigerant circuit A. The throttle device 14 is constituted by, for example, an electronic expansion valve that can adjust the opening degree of the throttle by a stepping motor (not shown), a mechanical expansion valve that employs a diaphragm as a pressure receiving portion, or a capillary tube. Can do.

(Flow path switching device 15)
The flow path switching device 15 can be constituted by a four-way valve, for example, and is included in the refrigerant circuit A.
The flow path switching device 15 can switch the flow of the refrigerant in the refrigerant circuit A by switching the refrigerant flow path.
The flow path switching device 15 includes a side of the first heat exchanger 11a where the expansion device 14 is not connected, a side of the second heat exchanger 11b where the expansion device 14 is not connected, 3 is connected to the side to which the discharge part of the compressor 13 is not connected and the suction part of the compressor 13.
The flow path switching device 15 includes a first state in which the first heat exchanger 11a functions as an evaporator and the second heat exchanger 11b functions as a condenser, and the first heat exchanger 11a serves as a condenser. And the second state in which the second heat exchanger 11b functions as an evaporator.
The flow path switching device 15 connects the third heat exchanger 11c and the second heat exchanger 11b, and connects the first heat exchanger 11a and the suction portion of the compressor 13, the first heat exchanger 11c and the second heat exchanger 11b. The refrigerant circuit A can be switched to the state. The flow path switching device 15 connects the third heat exchanger 11c and the first heat exchanger 11a, and connects the second heat exchanger 11b and the suction portion of the compressor 13, The refrigerant circuit A can be switched to the second state.

(Blower 12)
The blower 12 takes air into the air passage 50 where the heat exchanger 11 and the moisture adsorption unit 16 are installed, and supplies the air taken into the air passage 50 to the dehumidifying target space. Although the blower 12 is illustrated in FIG. 1 as being disposed downstream of the third heat exchanger 11c in the air flow direction, the blower 12 is not limited thereto, and for example, the first heat exchanger It may be upstream of 11a.
The blower 12 is a fan that can vary the flow rate of the air passing through the air passage in the dehumidifier 100. The blower 12 can be constituted by, for example, a centrifugal fan driven by a motor such as a DC fan motor, a multiblade fan, or the like.

(Moisture adsorption part 16)
The moisture adsorbing unit 16 has, for example, a shape corresponding to the air path cross section so as to ensure a wider air cross section relative to the air path cross section of the dehumidifier 100. For example, if the cross section of the air passage is a quadrangle, the cross section of the moisture adsorption unit 16 is a quadrilateral, and if the cross section of the air path is a hexagon, the cross section of the water adsorption portion 16 is a hexagon.
The moisture adsorbing unit 16 is a ventilation body having a plurality of through holes formed so that the air of the air passage 50 passes therethrough. The moisture adsorbing part 16 is, for example, a porous flat plate or the like, and is configured to allow air to pass in the thickness direction.
The moisture adsorbing unit 16 absorbs moisture from relatively high humidity air such as zeolite, silica gel, activated carbon, and polymer adsorbent on the surface of the porous flat plate, The thing which apply | coated, surface-treated, or impregnated the adsorbent which has the characteristic to release moisture is used.

(Temperature detector S)
The temperature detector S detects the temperature of the refrigerant. The temperature detection unit S is connected to the control device 4. Based on the detection result of the temperature detection unit S, the dehumidifying apparatus 100 switches between the first state and the second state and stops operation. The operation stop means that the operation of the dehumidifying apparatus 100 is stopped. For example, the compressor 13 is stopped and the blower 12 is stopped.

The temperature sensor 1e is disposed in the refrigerant pipe P3. The temperature sensor 1e detects the refrigerant inlet temperature of the second heat exchanger 11b in the first state, and detects the refrigerant outlet temperature of the second heat exchanger 11b in the second state.
The temperature sensor 1f is disposed in the refrigerant pipe P4. The temperature sensor 1f detects the refrigerant outlet temperature of the second heat exchanger 11b in the first state, and detects the refrigerant inlet temperature of the second heat exchanger 11b in the second state.

The temperature sensor 1g is disposed in the refrigerant pipe P5. The temperature sensor 1g detects the refrigerant inlet temperature of the first heat exchanger 11a when in the first state, and detects the refrigerant outlet temperature of the second heat exchanger 11b when in the second state.
The temperature sensor 1h is disposed in the refrigerant pipe P6. The temperature sensor 1h detects the refrigerant outlet temperature of the first heat exchanger 11a in the first state, and detects the refrigerant inlet temperature of the first heat exchanger 11a in the second state.

(Control device 4 and memory Me)
The control device 4 controls the switching of the flow path switching device 15, the frequency of the compressor 13, the rotational speed of the blower 12, the opening degree of the expansion device 14, and the like based on the detection result of the temperature detection unit S. . The control device 4 includes an operation control unit 4A, a determination unit 4B, and a calculation unit 4C.

The operation control unit 4A controls the blower 12, the compressor 13, the expansion device 14, and the flow path switching device 15 based on the determination result of the determination unit 4B.
The determination unit 4B performs defrost determination and protection stop determination, which will be described later. For the determination by the determination unit 4B, the refrigerant temperature data calculated by the calculation unit 4C is used.
The calculation unit 4C calculates the refrigerant temperature based on the detection result of the temperature detection unit S.

The control device 4 is, for example, dedicated hardware or a CPU that executes a program stored in the memory Me (also called a central processing unit, a central processing unit, a processing unit, a processing unit, a microprocessor, a microcomputer, a processor, etc.) Consists of.
When the control device 4 is dedicated hardware, the control device 4 is, for example, a single circuit, a composite circuit, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof. The thing corresponds. Each functional unit realized by the control device 4 may be realized by individual hardware, or each functional unit may be realized by one piece of hardware.
When the control device 4 is a CPU, each function executed by the control device 4 is realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory Me. The CPU implements each function of the control device 4 by reading and executing the program stored in the memory Me. Here, as the memory Me, for example, a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM can be adopted. Note that a part of the functions of the control device 4 may be realized by dedicated hardware, and a part may be realized by software or firmware.

  In the first state, the control device 4 determines whether or not the first condition is satisfied based on the detection results of the temperature sensor 1e and the temperature sensor 1f. In the second state, the control device 4 determines whether or not the first condition is satisfied based on the detection results of the temperature sensor 1g and the temperature sensor 1h. The determination as to whether or not the first condition is satisfied is used to determine whether or not to defrost the evaporator (defrost determination). Since there is a possibility that the evaporator may be frosted in either the first state or the second state, the control device 4 performs the defrosting determination in both the first state and the second state.

Next, the refrigerant temperature when trouble occurs in the evaporator due to frost formation will be described.
When frost is formed on the heat exchanger 11 and the air volume of the air supplied to the heat exchanger 11 decreases, the amount of refrigerant that condenses and liquefies decreases in the condenser, and the refrigerant having low density returns to the compressor 13. For this reason, the control device 4 increases the pressure of the refrigerant discharged from the compressor 13 by increasing the frequency of the compressor 13 in order to promote condensate liquefaction. On the other hand, when the air volume of the air supplied to the heat exchanger 11 is reduced, the evaporation amount of the refrigerant is reduced in the evaporator, and the difference between the inlet temperature and the outlet temperature of the evaporator is reduced. For this reason, the control device 4 reduces the opening degree of the expansion device 14 in order to ensure the evaporation amount of the refrigerant. Then, although the temperature of the refrigerant flowing into the evaporator decreases, the frost does not melt even if the opening degree of the expansion device 14 is reduced, so that the air volume of the air supplied to the evaporator remains reduced. However, the amount of refrigerant evaporated in the evaporator is still decreasing. Therefore, in an environment where the suction temperature of the compressor 13 is low, the amount of refrigerant evaporated in the evaporator decreases, so there is not much difference between the inlet temperature and the outlet temperature of the evaporator (corresponding to condition C1 described later). Moreover, since the opening degree of the expansion device 14 is reduced, the inlet temperature of the evaporator is lowered (corresponding to condition C2 described later). Therefore, the control device 4 determines whether or not the first condition is satisfied, switches between the first state and the second state, and performs defrosting.

  The control device 4 determines whether or not the second condition is satisfied based on the detection results of the temperature sensor 1e and the temperature sensor 1h in both the first state and the second state. The determination as to whether or not the second condition is satisfied is used to determine whether or not the dehumidifying device 100 should be stopped immediately (protection stop determination). The protection stop determination is, for example, a determination performed assuming the following case. First, there is a case where dust is collected in a filter (not shown) arranged upstream of the first heat exchanger 11a in the air passage 50 and air is prevented from being supplied downstream from the filter. Second, when the motor and fan of the blower 12 slip or when the static pressure is high, the air volume of the blower 12 decreases and the amount of air supplied to the heat exchanger 11 decreases. Assuming malfunctions in these cases (hereinafter also referred to as malfunctions other than frost formation), the dehumidifying apparatus 100 automatically stops operation by making a protection stop determination, thereby protecting the dehumidifying apparatus 100.

Next, the refrigerant temperature when troubles other than frost formation occur will be described.
Even in the case of problems other than frost formation, the tendency of the refrigerant temperature in the evaporator is the same. That is, in an environment where the suction temperature of the compressor 13 is low, the amount of refrigerant evaporated in the evaporator decreases, so the difference between the inlet temperature and the outlet temperature of the evaporator is small, and the expansion device 14 Since the opening degree is reduced, the inlet temperature of the evaporator is lowered. For this reason, the dehumidifying device 100 switches the flow path switching device 15 even when troubles other than frosting occur. However, even if the flow path switching device 15 is switched, problems other than frost formation are not eliminated. That is, if the filter is clogged, air is still prevented from being supplied downstream from the filter. For this reason, for example, when considering the case of switching from the first state to the second state, since the air volume of the air supplied to the third heat exchanger 11c is small, the refrigerant in the third heat exchanger 11c The amount of heat released is small, and the refrigerant becomes difficult to condense. For this reason, the temperature of the refrigerant (condenser inlet temperature) supplied to the first heat exchanger 11a increases.
In addition, if it is a case where it forms frost, the frost formed in the 1st heat exchanger 11a at the time of a 1st state will melt | dissolve, and the 3rd heat exchanger which is downstream from the 1st heat exchanger 11a Air is appropriately supplied to 11c. For this reason, the heat radiation amount of the refrigerant in the third heat exchanger 11c is ensured. Therefore, the temperature of the refrigerant supplied to the first heat exchanger 11a (condenser inlet temperature) is suppressed.

(Conditions C1 and C2 of the first condition and conditions D1 and D2 of the second condition)
The first condition is a condition based on the temperature of the evaporator. This is because if the evaporator has frost formation, it becomes difficult for the evaporator and the air to exchange heat with each other, and the temperature change of the refrigerant before and after passing through the evaporator becomes small.
Specifically, the first condition includes a condition C1 in which a difference between the evaporator inlet temperature and the evaporator outlet temperature is smaller than a predetermined first temperature difference. In addition, the first condition includes a condition C2 that the inlet temperature of the evaporator is lower than the predetermined first temperature. The first condition may be only the condition C1, but it is intended to switch from the first state to the second state or to switch from the second state to the first state by adding the condition C2. Although it is not done, it can be avoided that the state is switched. For the purpose of defrosting the evaporator, switching from the first state to the second state, or switching from the second state to the first state is performed. That is, by including the condition C2 in the first condition, it is possible to avoid defrosting the evaporator even in a situation where the evaporator inlet temperature is high and the evaporator is assumed to be free of frost. And the accuracy of the defrosting determination of the evaporator can be improved.

The second condition is a condition based on at least the temperature of the condenser. This means that if there is a problem other than frosting, the high-temperature refrigerant that has passed through the third heat exchanger 11c is transferred to the first heat exchanger 11a when the first state is switched to the second state. This is because it will continue to be supplied. When the second state is switched to the first state, the high-temperature refrigerant that has passed through the third heat exchanger 11c is continuously supplied to the second heat exchanger 11b.
Specifically, the second condition includes a condition D1 in which a difference between the condenser inlet temperature and the evaporator outlet temperature is larger than a predetermined second temperature difference. At the time of troubles other than defrosting, the inlet temperature of the condenser is high. Further, even when the first state and the second state are switched, the amount of air supplied to the heat exchanger 11 is still small, so that the amount of evaporation in the evaporator cannot be secured, and the opening degree of the expansion device 14 is increased. Since it remains small, the outlet temperature of the evaporator is low. As a result, the second temperature difference is also increased. The condenser here is the first heat exchanger 11a in the second state, and the second heat exchanger 11b in the first state. Moreover, the evaporator here is the second heat exchanger 11b in the second state, and the first heat exchanger 11a in the first state.
On the contrary, if it is at the time of defrosting, the frost of an evaporator will melt | dissolve and air will be supplied to the 3rd heat exchanger 11c arrange | positioned in the most downstream of an air flow direction. For this reason, the temperature of a refrigerant | coolant falls by the 3rd heat exchanger 11c, and a high temperature refrigerant | coolant does not continue being supplied to the 1st heat exchanger 11a or the 2nd heat exchanger 11b. For this reason, if it is at the time of malfunction of defrost, the 2nd condition will not be satisfied. That is, if the blower 12 is operating without stopping, the second condition can distinguish between defects other than defrosting and defects of defrosting.
In addition, the second condition includes a condition D2 that the outlet temperature of the evaporator is lower than a predetermined second temperature. By including the condition D2 in addition to the condition D1, the second condition can improve the determination accuracy of defects other than defrosting.

The protection stop determination is performed for a certain period T after it is determined that the defrosting is performed in the defrosting determination. The fixed period T is set to about several minutes, for example. In this fixed period T, even if the first condition is satisfied in the defrosting determination, switching from the first state to the second state and switching from the second state to the first state are not performed. . This is because, after it is determined that defrosting is performed in the defrosting determination, it is determined that defrosting is performed again soon after. That is, it is for avoiding that the defrosting is frequently determined and the flow path switching device 15 is frequently switched.
Here, if the flow path switching device 15 is frequently switched, the detection result of the temperature detection unit S fluctuates each time, and the temperature data that the control device 4 acquires from the temperature detection unit S becomes unstable. . As a result, the control device 4 cannot accurately perform the protection stop determination. Therefore, after determining that the first condition is satisfied, the control device 4 does not determine that defrosting is performed for a certain period T even if the first condition is satisfied. And the control apparatus 4 performs only protection stop determination for the fixed period T. FIG. Thereby, in the dehumidification apparatus 100, it is avoiding that the determination precision of malfunctions other than defrost will fall. In addition, determination of malfunctions other than frost refers to protection stop determination.

(Condition C3 of the first condition and conditions D3 and D4 of the second condition)
The first condition further includes a condition C3 that a period that satisfies the first condition continues for a predetermined first period. That is, as shown in FIG. 3, when the condition C1 of the first condition is satisfied during the period between the time t1 and the time t2 corresponding to the first period, the first state and the second state This means that the flow path switching device 15 is switched to switch the state. Note that if the first condition includes the condition C2, the period satisfying the condition C1 and the condition C2 may be continued for the first period.
The second condition further includes a condition D3 in which a period satisfying the second condition continues for a predetermined second period longer than the first period. Note that the second condition includes, for example, a condition D4 that the second period includes the first period so as to continue even after the first period ends.
As shown in FIG. 3, the operation is stopped when the condition D1 of the second condition is satisfied during the period between the time t1 and the time t3 corresponding to the second period. Note that if the second condition includes the condition D2, the period satisfying the condition D1 and the condition D2 may be continued for the second period.
In the dehumidifying apparatus 100, the defrosting determination is performed first by providing the configurations of the condition C3, the condition D3, and the condition D4. For this reason, when the malfunction of the dehumidifier 100 is frost formation of the heat exchanger 11, the control device 4 determines that it is a malfunction other than frost formation, and the operation is stopped instead of switching the flow path switching device 15. Can be avoided.

(Refrigerant)
Examples of the refrigerant used in the refrigerant circuit A include HFC refrigerants such as R410A, R407C, and R404A, HCFC refrigerants such as R22 and R134a, or natural refrigerants such as hydrocarbon and helium.

[Flow of refrigerant in first state]
The flow of the refrigerant in the first state will be described with reference to FIG.
The refrigerant discharged from the compressor 13 flows to the third heat exchanger 11c. At this time, the third heat exchanger 11c acts as a condenser, and a part of the refrigerant is condensed and liquefied when exchanging heat with air. After passing through the third heat exchanger 11c, the refrigerant passes through the flow path switching device 15 and flows to the second heat exchanger 11b. The second heat exchanger 11 b acts as a condenser, and the refrigerant condenses and liquefies when exchanging heat with air and flows to the expansion device 14. The refrigerant is depressurized by the expansion device 14 and then flows to the first heat exchanger 11a. The first heat exchanger 11a functions as an evaporator. The refrigerant exchanges heat with air and evaporates, and then passes through the flow path switching device 15 and is sucked into the compressor 13 again.

[Dehumidification in the first state]
In the first state, the air taken into the air passage 50 from the suction port 50A is sent into the first heat exchanger 11a. Here, the air taken into the air passage 50 is cooled by the first heat exchanger 11a functioning as an evaporator. The air that has passed through the first heat exchanger 11 a is cooled to a dew point temperature or lower to become air that has been cooled and dehumidified, and is sent to the moisture adsorption unit 16. This cooled and dehumidified air has an increased relative humidity. For this reason, the adsorbent of the moisture adsorbing unit 16 is easy to adsorb moisture. That is, moisture is adsorbed by the adsorbent of the moisture adsorbing unit 16 in the cooled and dehumidified air. Then, air is heated by the 2nd heat exchanger 11b and the 3rd heat exchanger 11c which function as a condenser, and it blows off from the blower outlet 50B.

[Refrigerant Flow in Second State]
FIG. 4 is a diagram illustrating a second state of the dehumidifying device according to the present embodiment.
The refrigerant discharged from the compressor 13 flows to the third heat exchanger 11c. At this time, the third heat exchanger 11c acts as a condenser, and a part of the refrigerant is condensed and liquefied when exchanging heat with air. After passing through the third heat exchanger 11c, the refrigerant passes through the flow path switching device 15 and flows to the first heat exchanger 11a. The first heat exchanger 11 a acts as a condenser, and the refrigerant condenses and liquefies when exchanging heat with air and flows to the expansion device 14. The refrigerant is depressurized by the expansion device 14 and then flows into the second heat exchanger 11b. The second heat exchanger 11b functions as an evaporator, and the refrigerant exchanges heat with air and evaporates, and then passes through the flow path switching device 15 and is sucked into the compressor 13 again.

[Dehumidification in the second state]
In the second state, the air taken into the air passage 50 from the suction port 50A is sent to the first heat exchanger 11a. Here, the air taken into the air passage 50 is heated by the first heat exchanger 11a functioning as a condenser, the passing air temperature rises, and is sent to the moisture adsorption unit 16. The relative humidity of the heated air is lower than the air flowing into the suction port 50A. For this reason, the adsorbent of the moisture adsorption unit 16 is easy to desorb moisture. That is, moisture is desorbed from the heated air by the adsorbent of the moisture adsorption unit 16. Since the second heat exchanger 11b functions as an evaporator, it cools the passing air. When the cooled passing air is cooled to a dew point temperature or lower, it becomes dehumidified air from which moisture has been dehumidified. That is, in the second state, air is dehumidified by the action of the second heat exchanger 11b functioning as an evaporator. Thereafter, the air is heated by the third heat exchanger 11c functioning as a condenser and blown out from the outlet 50B.

[Modification 1 of Embodiment]
FIG. 5 is a first modification of the dehumidifying device according to the embodiment of the present invention. In the first modification, differences from the embodiment will be mainly described, and description of common parts will be omitted.

  As shown in FIG. 5, the dehumidifying device 200 according to the first modification includes a temperature sensor 1d and a temperature sensor 1j. The temperature sensor 1d is disposed in the refrigerant pipe P2. The temperature sensor 1j is disposed in the refrigerant pipe P7. A temperature sensor 1d and a temperature sensor 1j are arranged. In the embodiment, the relationship between the temperature data of the temperature sensor 1e used for the protection stop determination and the temperature data of the temperature sensor 1h used for the protection stop determination is reversed between the first state and the second state. Thus, by providing the temperature sensor 1d and the temperature sensor 1j as in Modification 1, it is not necessary to replace the temperature data of the temperature sensor 1e and the temperature data of the temperature sensor 1h.

[Modification 2 of Embodiment]
FIG. 6 is a second modification of the dehumidifying device according to the embodiment of the present invention. In the second modification, differences from the embodiment will be mainly described, and description of common parts will be omitted.

  As shown in FIG. 6, the dehumidifying device 300 according to the second modification is a separate type, and includes a dehumidifying unit 301 and a compression unit 302. The dehumidifying unit 301 includes the heat exchanger 11, the moisture adsorption unit 16, the expansion device 14, the flow path switching device 15, the blower 12, the air path 50, the control device 4, the memory Me, the temperature detection unit S, and the like. The compression unit 302 includes the compressor 13. A valve 17 is connected to the refrigerant pipe P1, and a valve 18 is connected to the refrigerant pipe P7. The valve 17 and the valve 18 are disposed outside the dehumidifying unit 301 and the compression unit 302. Note that the valve 17 and the valve 18 may be disposed in the dehumidifying unit 301 or may be disposed in the compression unit 302.

  In the dehumidifying apparatus 300, when it determines with stopping operation by protection stop determination, the structure which can implement an operation stop only with a contact circuit is employ | adopted. Specifically, the dehumidifying device 300 includes a valve 17 and a valve 18 that are opened and closed by a contact circuit.

When the dehumidifying device is a ceiling-suspended type, since the compressor serves as a vibration source, it is difficult to mount the compressor in a unit together with a heat exchanger or the like. That is, the dehumidifying device needs to be a separate type that is divided into a compression unit and a dehumidifying unit. However, in the case of the separate type, there are the following problems when performing the operation stop (stop of the compressor) based on the protection stop determination.
First, if control based on the temperature sensor is performed not only in the dehumidification unit but also in the compression unit, it is necessary to arrange separate substrates for the compression unit and the dehumidification unit, which increases manufacturing costs.
Moreover, when a control device is mounted on the compression unit, a weak electric circuit of the temperature detection unit is provided between the units. If it does so, the noise from strong electric circuits, such as the compressor 13, will ride on the wiring put between the units, and the reliability of the dehumidifier 300 will fall.

Therefore, the dehumidifying apparatus 300 includes a valve 17 and a valve 18 that are opened and closed by a contact circuit. For this reason, it is not necessary to provide an expensive board | substrate separately from the board | substrate of the control apparatus 4 of the dehumidification unit 301, and the increase in manufacturing cost can be suppressed.
Further, since the dehumidifying device 300 is not an aspect in which the control device 4 or the like is mounted on the compression unit 302, the above-described noise problem is less likely to occur, and a decrease in the reliability of the dehumidifying device 300 can be avoided.

  1 b temperature sensor, 1 d temperature sensor, 1 e temperature sensor, 1 f temperature sensor, 1 g temperature sensor, 1 h temperature sensor, 1 j temperature sensor, 4 control device, 4 A operation control unit, 4 B determination unit, 4 C calculation unit, 11 heat exchanger, 11a 1st heat exchanger, 11b 2nd heat exchanger, 11c 3rd heat exchanger, 12 air blower, 13 compressor, 14 throttle device, 15 flow path switching device, 16 moisture adsorption part, 17 valve, 18 Valve, 50 Airway, 50A Air inlet, 50B Air outlet, 100 Dehumidifier, 200 Dehumidifier, 300 Dehumidifier, 301 Dehumidifier unit, 302 Compression unit, A Refrigerant circuit, Me memory, P1 Refrigerant pipe, P2 Refrigerant pipe, P3 Refrigerant piping, P4 refrigerant piping, P5 refrigerant piping, P6 refrigerant piping, P7 refrigerant piping, S temperature detector, T fixed period .

A dehumidifying device according to the present invention is a dehumidifying device including a refrigerant circuit, and is disposed in an air path through which air taken in from the space to be dehumidified flows, a blower that takes air in the space to be dehumidified into the air path, and the air path. Adsorption of moisture contained in the air and a moisture adsorption part for desorbing the adsorbed moisture to the air, a compressor included in the refrigerant circuit, and an upstream of the moisture adsorption part of the air passage, included in the refrigerant circuit A first heat exchanger that functions as an evaporator or a condenser, and a second heat exchange that is disposed downstream of the moisture adsorbing portion of the air passage and is included in the refrigerant circuit and functions as a condenser or an evaporator. And the expansion device included in the refrigerant circuit and connected between the first heat exchanger and the second heat exchanger, and the first heat exchanger functions as an evaporator and the second A first state in which the heat exchanger functions as a condenser and a first heat exchange; A flow path switching device included in the refrigerant circuit, and a refrigerant temperature of the evaporator and the condenser, which switches between a second state in which the condenser functions as a condenser and the second heat exchanger functions as an evaporator. A temperature detection unit, and a control device that controls the compressor, the blower, and the flow path switching device based on the detection result of the temperature detection unit, and the control device includes the refrigerant temperature at the inlet of the condenser, the evaporator When the temperature difference from the refrigerant temperature at the inlet is larger than the threshold value, it is determined that a defect other than frosting has occurred .

Claims (9)

A dehumidifying device including a refrigerant circuit,
An air path through which air taken in from the space to be dehumidified flows;
A blower for taking air in the dehumidification target space into the air path;
A moisture adsorbing part that is arranged in the air passage and adsorbs moisture contained in the air and desorbs the adsorbed moisture to the air;
A compressor included in the refrigerant circuit;
A first heat exchanger disposed upstream of the moisture adsorbing portion of the air passage, included in the refrigerant circuit, and functioning as an evaporator or a condenser;
A second heat exchanger disposed downstream of the moisture adsorbing portion of the air path, included in the refrigerant circuit, and functioning as the condenser or the evaporator;
A throttle device included in the refrigerant circuit and connected between the first heat exchanger and the second heat exchanger;
A first state in which the first heat exchanger functions as an evaporator and the second heat exchanger functions as a condenser; and the second state in which the first heat exchanger functions as a condenser and the second A flow path switching device included in the refrigerant circuit, which switches between a second state in which the heat exchanger functions as an evaporator, and
A temperature detector for detecting refrigerant temperatures of the evaporator and the condenser;
A control device that controls the compressor, the blower, and the flow path switching device based on the detection result of the temperature detection unit;
With
The control device includes:
When satisfying the first condition based on the temperature of the evaporator, switching from the first state to the second state, or from the second state to the first state,
If at least the second condition based on the temperature of the condenser is satisfied, the operation is stopped,
Even if the first condition is satisfied for a certain period after it is determined that the first condition is satisfied, the switching from the first state to the second state, and the second condition A dehumidifier configured not to switch from a state to the first state. The first condition is:
The dehumidifying device according to claim 1, further including a condition that a difference between an inlet temperature of the evaporator and an outlet temperature of the evaporator is smaller than a predetermined first temperature difference. The first condition is:
The dehumidifier according to claim 2, further comprising a condition that an inlet temperature of the evaporator is lower than a predetermined first temperature. The second condition is:
The dehumidification apparatus as described in any one of Claims 1-3 including the conditions that the difference of the inlet temperature of the said condenser and the outlet temperature of the said evaporator is larger than the 2nd predetermined temperature difference. The second condition is:
The dehumidifying device according to claim 4, further comprising a condition that an outlet temperature of the evaporator is lower than a predetermined second temperature. The first condition is:
Further including a condition that the period satisfying the condition continues for a first predetermined period;
The second condition is:
Further including a condition that the period that satisfies the condition continues for a predetermined second period that is longer than the first period;
The second period is:
The dehumidifying device according to any one of claims 1 to 5, including the first period so as to continue even after the first period ends. 7. The apparatus according to claim 1, further comprising a third heat exchanger that is disposed downstream of the air path from the second heat exchanger, is included in the refrigerant circuit, and functions as the condenser. Dehumidifier according to item. The flow path switching device is
In the first state, the third heat exchanger and the second heat exchanger are connected and the first heat exchanger and the suction portion of the compressor are connected,
The said 2nd heat exchanger and the suction part of the said compressor are connected while connecting the said 3rd heat exchanger and a said 1st heat exchanger in the said 2nd state. Dehumidifier. The control device includes:
In order to increase the amount of heat exchange in the evaporator, the opening degree of the expansion device is reduced before the difference between the inlet temperature of the evaporator and the outlet temperature of the evaporator becomes smaller than the first temperature difference. And reducing the temperature of the refrigerant flowing into the evaporator,
When the difference between the evaporator inlet temperature and the evaporator outlet temperature is smaller than the first temperature difference, the first state is changed to the second state, or the second state is changed to the second state. The dehumidifying device according to claim 2 or 3, wherein the dehumidifying device is switched to the first state.

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