JP7680709B2 - Vehicle dehumidifier - Google Patents

Description

The present invention relates to a vehicle dehumidifier used to dehumidify the interior space of various vehicles such as automobiles.

A conventional vehicle dehumidifier is disclosed in, for example, Patent Document 1. The vehicle dehumidifier described in Patent Document 1 constitutes part of an air conditioner. This air conditioner circulates a medium between an indoor heat exchanger and an outdoor heat exchanger, and in a cooling mode, the indoor heat exchanger cools the inside air. The outdoor heat exchanger releases heat from the inside air to the outside of the vehicle cabin. In a heating mode, the indoor heat exchanger heats the outside air and releases it into the vehicle cabin, which is the opposite of the cooling mode. The above air conditioner is equipped with a dehumidifying member that dehumidifies the air passing through the air passage, and adjusts the air flow according to the operating state.

JP 2013-209006 A

However, conventional vehicle dehumidifiers as described above are a function of an air conditioning system, and when the humidity of the outside air is high, the inside air is also humidified in cooling mode, which creates the problem that extra power is consumed to cool and dehumidify the inside air at the same time, and solving this problem was a challenge.

The present invention was made with a focus on the above-mentioned conventional problems, and aims to provide a vehicle dehumidifier that can improve the internal air circulation rate and reduce power consumption.

The vehicle dehumidifier according to the present invention includes an outside air duct that forms a flow path leading to the outside of the vehicle cabin by circulating outside air introduced from the outside of the vehicle cabin , an inside air duct that forms a flow path leading to the inside of the vehicle cabin by circulating inside air introduced from the inside of the vehicle cabin , a gas separation membrane that is arranged between the flow paths of the outside air duct and the inside air duct and exchanges gases based on a humidity difference between the inside and outside of the vehicle cabin, an outside air temperature and humidity sensor that detects the temperature and humidity of the outside air introduced from the outside of the vehicle cabin in the outside air duct, and an inside air temperature and humidity sensor that detects the temperature and humidity of the inside air introduced from the inside of the vehicle cabin in the inside air duct. In addition, at least the inside air duct of the outside air duct and the inside air duct is provided with an opening and closing valve that opens and closes the flow path. The vehicle dehumidifier is characterized by including a control unit that controls the opening and closing of the opening and closing valve based on detection signals of the outside air temperature and humidity sensor and the inside air temperature and humidity sensor.

In the above vehicle dehumidifier, the outside air duct circulates outside air introduced from outside the vehicle cabin inside the device and then releases it back outside the vehicle cabin. Similarly, the inside air duct circulates inside air introduced from inside the vehicle cabin inside the device and then releases it back inside the vehicle cabin. This inside air duct can also be used as a path for introducing inside air from the vehicle's air conditioning system, or as a path for supplying inside air to the air conditioning system. The control unit detects the absolute humidity of the outside air and inside air based on the temperature and humidity inside and outside the vehicle cabin detected by the outside air temperature and humidity sensor and the inside air temperature and humidity sensor.

The vehicle dehumidifier of the present invention can improve the inside air circulation rate and reduce power consumption by controlling the air flow to reduce the absolute humidity of the inside air according to the temperature and humidity difference between the inside and outside of the vehicle.

1 is a cross-sectional explanatory view showing a first embodiment of a dehumidifier for a vehicle according to the present invention; FIG. 4 is a cross-sectional view illustrating a second embodiment of a dehumidifier for a vehicle according to the present invention; FIG. 11 is a cross-sectional view illustrating a third embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 11 is a cross-sectional view illustrating a fourth embodiment of a dehumidifier for a vehicle according to the present invention. 13A is a cross-sectional view showing a case where the humidity of the outside air is lower than the humidity of the inside air; FIG. 13B is a cross-sectional view showing a case where the humidity of the outside air is higher than the humidity of the inside air; and FIG. 13C is a cross-sectional view showing a case where the outside air is introduced into the inside air. FIG. 13 is an explanatory cross-sectional view showing a sixth embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 13 is an explanatory cross-sectional view showing a seventh embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 13 is a cross-sectional view illustrating an eighth embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 13 is an explanatory cross-sectional view showing a ninth embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 23 is an explanatory cross-sectional view showing a tenth embodiment of a dehumidifier for a vehicle according to the present invention. FIG. 19 is an explanatory cross-sectional view showing an eleventh embodiment of a dehumidifier for a vehicle according to the present invention.

First Embodiment
The vehicle dehumidifier shown in Figure 1 includes an outside air duct 1 that forms a flow path for outside air introduced from outside the vehicle cabin, an inside air duct 2 that forms a flow path for inside air introduced from inside the vehicle cabin, and a gas separation membrane 3 arranged between the flow paths of the outside air duct 1 and the inside air duct 2.

The vehicle dehumidifier also includes an outside air temperature and humidity sensor S1 and an inside air temperature and humidity sensor S2 for detecting the temperature and humidity inside and outside the vehicle cabin, and at least the inside air duct 2 of the outside air duct 1 and the inside air duct 2 includes an on-off valve V2 for opening and closing the flow path. In this embodiment, both the outside air duct 1 and the inside air duct 2 include on-off valves V1, V2. The vehicle dehumidifier also includes a control unit C for controlling the opening and closing of the on-off valves V1, V2 based on detection signals from the outside air temperature and humidity sensor S1 and the inside air temperature and humidity sensor S2.

As shown by the arrows in the figure, the outside air duct 1 circulates outside air introduced from outside the vehicle cabin into the inside of the device and then releases it back outside the vehicle cabin. As also shown by the arrows, the inside air duct 2 circulates inside air introduced from inside the vehicle cabin into the inside of the device and then releases it back inside the vehicle cabin. This inside air duct 2 can also be used as a path for introducing inside air from the vehicle's air conditioning system, or as a path for supplying inside air to the vehicle's air conditioning system. The outside air duct 1 and the inside air duct 2 are arranged parallel to each other in the main parts shown in the figure.

The gas separation membrane 3 is an existing device that exchanges gas due to the difference in humidity between the inside and outside of the vehicle, and allows air to pass from the higher humidity to the lower humidity. This gas separation membrane 3 forms an opening in the adjacent parts of the outside air duct 1 and the inside air duct 2 that communicate with each other, and is attached so as to close this opening.

The vehicle dehumidifier also includes an outside air temperature and humidity sensor S1 and an inside air temperature and humidity sensor S2 for detecting the temperature and humidity inside and outside the vehicle cabin, and the outside air duct 1 and the inside air duct 2 are provided with on-off valves V1, V2 for opening and closing the respective flow paths upstream of the gas separation membrane 3. The vehicle dehumidifier also includes a control unit C for controlling the opening and closing of the on-off valves V1, V2 based on detection signals from the outside air temperature and humidity sensor S1 and the inside air temperature and humidity sensor S2.

In this embodiment of the vehicle dehumidifier, the outside air duct 1 and the inside air duct 2 are equipped with on-off valves V1 and V2 that open and close the respective flow paths upstream of the gas separation membrane 3 (left side in the figure), and an outside air temperature and humidity sensor S1 and an inside air temperature and humidity sensor S2 are respectively arranged upstream of the on-off valves V1 and V2.

The control unit C is a computer and can function as part of the vehicle's air conditioning system. It calculates absolute humidity from the temperatures and humidities detected by the outside air temperature and humidity sensor S1 and the inside air temperature and humidity sensor S2, and controls the opening and closing of the on-off valves V1 and V2 based on the calculation results.

When the humidity of the outside air is higher than the humidity of the inside air, the vehicle dehumidifier having the above configuration closes the on-off valve V1 of the outside air duct 1 to prevent the introduction of outside air, and opens the on-off valve V2 of the inside air duct 2. As a result, the vehicle dehumidifier allows the inside air to pass through the gas separation membrane 3 and releases it to the outside air. In other words, the inside of the vehicle is dehumidified while preventing the introduction of humid outside air.

Furthermore, when the humidity of the outside air is lower than the humidity of the inside air, the vehicle dehumidifier opens the on-off valves V1, V2 of the outside air duct 1 and the inside air duct 2. This causes the vehicle dehumidifier to allow the high humidity inside air to pass through the gas separation membrane 3 and release it to the outside air. At this time, the vehicle dehumidifier opens the on-off valve V1 of the outside air duct 1, but the low humidity outside air does not pass through the gas separation membrane 3, and the outside air acts as a sweep gas to quickly release the high humidity inside air to the outside air. This quickly dehumidifies the interior of the vehicle.

In this way, the above-mentioned vehicle dehumidifier can improve the inside air circulation rate and reduce power consumption by controlling the flow of outside air and inside air to reduce the absolute humidity of the inside air according to the temperature and humidity inside and outside the vehicle cabin. For example, even when the vehicle's air conditioning system is in cooling mode and the humidity of the outside air is higher than the humidity of the inside air, the vehicle dehumidifier ensures an independent dehumidification function, so it is possible to reduce power consumption compared to when the air conditioning system dehumidifies while cooling.

The vehicle dehumidifier also has an outside air temperature and humidity sensor S1 and an inside air temperature and humidity sensor S2 located upstream of the gas separation membrane 3 in the outside air duct 1 and the inside air duct 2, respectively. This allows the vehicle dehumidifier to detect the temperature and humidity of the outside air and inside air before gas exchange by the gas separation membrane 3, which can contribute to improving the accuracy of opening and closing control by the control unit C.

The vehicle dehumidifier of the present invention is basically configured such that at least the inside air duct 2 of the outside air duct 1 and the inside air duct 2 has an on-off valve that opens and closes the flow path, and the control unit C controls the opening and closing of the on-off valve so as to reduce the absolute humidity of the inside air. In the above embodiment, the on-off valve V1 is disposed on the inlet side of the outside air duct 1, so the on-off valve V2 is disposed on the inlet side of the inside air duct 2.

In contrast, the vehicle dehumidifier may be configured so that the outside air duct 1 does not have an on-off valve. In this case, if on-off valves are placed both upstream and downstream of the gas separation membrane 3 in the inside air duct 2, the vehicle dehumidifier can prevent the introduction of outside air into the vehicle cabin and release the inside air to the outside.

Figures 2 to 11 are diagrams illustrating second to eleventh embodiments of the vehicle dehumidifier according to the present invention. In the following embodiments, the same components as those in the first embodiment are given the same reference numerals, and detailed descriptions are omitted. In each figure, the opening and closing valve that switches between the two flow paths rotates back and forth between the position indicated by the solid line and the position indicated by the dotted line.

Second Embodiment
2 has a basic configuration equivalent to that of the first embodiment, and in addition, the outside air duct 1 is provided with a branch portion 1A communicating with the inside air duct 2 downstream of the gas separation membrane 3, and an on-off valve V3 for opening and closing the flow path downstream of the branch portion 1A. Also, in the vehicle dehumidifier, the inside air duct 2 is provided with an on-off valve V4 downstream of the gas separation membrane 3 for switching between opening and closing the flow paths of both the inside air duct 2 and the branch portion 1A.

As in the first embodiment, the vehicle dehumidifier described above improves the inside air circulation rate and reduces power consumption by controlling the opening and closing of valves V1 to V4 using a control unit (symbol C in FIG. 1) to reduce the absolute humidity of the inside air according to the temperature and humidity of the outside and inside air.

The above-mentioned vehicle dehumidifier controls the opening and closing of the on-off valves V1 and V2 upstream of the gas separation membrane 3, as well as the opening and closing of the on-off valves V3 and V4 downstream of the gas separation membrane 3, allowing the outside air to be used as a sweep gas for the inside air or for ventilating the vehicle cabin. This allows the above-mentioned vehicle dehumidifier to have a simple and compact structure while providing multiple functions in the circulation modes for the outside air and the inside air.

Third Embodiment
3 has a basic configuration equivalent to that of the second embodiment, and in addition, at least one of the outside air duct 1 and the inside air duct 2 has a main duct portion (1M, 2M) in which a gas separation membrane 3 is disposed, and a bypass portion (1B, 2B) which is a bypass path for the main duct portion (1M, 2M). In this embodiment, both the outside air duct 1 and the inside air duct 2 have the main duct portions 1M, 2M and the bypass portions 1B and 2B.

The vehicle dehumidifier is provided with on-off valves V5 to V8 at the upstream and downstream ends of the bypass sections 1B and 2B, which switch between opening and closing the flow paths of the main duct sections 1M and 2M and the bypass sections 1B and 2B. In the vehicle dehumidifier shown in the figure, the on-off valve V3 located at the most downstream side of the outside air duct 1 opens and closes to switch between the outside air duct 1 and the branch section 1A. Similarly, the on-off valve V4 located at the most downstream side of the inside air duct opens and closes to switch between the branch section 1A and the inside air duct 2.

The vehicle dehumidifier having the above configuration can achieve the same effects as the previous embodiments by controlling the opening and closing of each of the on-off valves V3 to V8 using the control unit (see FIG. 1) to reduce the absolute humidity of the inside air based on the temperature and humidity difference between the outside air and the inside air.

The above vehicle dehumidifier also employs bypass sections 1B and 2B and on-off valves V3 to V8 located at the upstream and downstream ends of these sections, allowing for even greater versatility in the outside air and inside air circulation modes.

Fourth Embodiment
The vehicle dehumidifier shown in FIG. 4 is configured such that, whereas in the third embodiment, both the outside air duct 1 and the inside air duct 2 have bypass sections 1B, 2B, only the inside air duct 2 has a bypass section 2B and opening/closing valves V6, V8 at its upstream and downstream ends.

Even in a vehicle dehumidifier having the above configuration, as in the third embodiment, it is possible to improve the inside air circulation rate and reduce power consumption, while also achieving further multi-functionality in the outside air and inside air circulation modes.

Fifth embodiment
5, the outside air duct 1 has a simple structure without an on-off valve, and the inside air duct 2 has a bypass section 2B and on-off valves V6, V8 arranged at its upstream and downstream ends. Also, in the vehicle dehumidifier of this embodiment, the inside air duct 2 has, upstream of the gas separation membrane 3, an outside air inlet section 2P for introducing outside air, and an on-off valve V9 for switching between opening and closing both the flow paths of the inside air duct 2 and the outside air inlet section 2P.

When the humidity of the outside air is lower than that of the inside air (outside air humidity < inside air humidity), the vehicle dehumidifier having the above configuration opens the flow path F2 of the inside air duct 2 with the most upstream opening/closing valve V9 and closes the outside air intake section 2P, as shown in FIG. 5 (A). In addition, in the inside air duct 2, the opening/closing valve V6 at the upstream end of the bypass section 2B opens the main duct section 2M and closes the bypass section 2B with the opening/closing valve V8 at the downstream end of the bypass section 2B, and opens the main duct section 2M and closes the bypass section 2B with the opening/closing valve V8. As a result, the vehicle dehumidifier allows the highly humid inside air to permeate the gas separation membrane 3 and releases it to the outside air, and at this time, the inside air that has permeated the gas separation membrane 3 is quickly released using the outside air as a sweep gas.

When the humidity of the outside air is higher than that of the inside air (outside air humidity > inside air humidity), the above-mentioned vehicle dehumidifier opens the flow path F2 of the inside air duct 2 with the most upstream opening/closing valve V9 and closes the outside air intake section 2P, as shown in FIG. 5(B). In addition, in the inside air duct 2, the opening/closing valve V6 at the upstream end of the bypass section 2B closes the main duct section 2M and opens the bypass section 2B, and further, the opening/closing valve V8 at the downstream end of the bypass section 2B closes the main duct section 2M and opens the bypass section 2B. In this way, the vehicle dehumidifier prevents outside air from being introduced into the inside air through the outside air duct 1 and the outside air intake section 2P, and only circulates the inside air.

When the humidity of the outside air is lower than that of the inside air (outside air humidity < inside air humidity) or when there is no difference in humidity between the inside and outside of the vehicle (outside air humidity = inside air humidity), the above-mentioned vehicle dehumidifier opens the flow path F2 of the inside air duct 2 with the most upstream opening/closing valve V9 and closes the outside air intake section 2P, as shown in FIG. 5 (C). In addition, in the inside air duct 2, the opening/closing valve V6 at the upstream end of the bypass section 2B closes the main duct section 2M and opens the bypass section 2B, and further, the opening/closing valve V8 at the downstream end of the bypass section 2B closes the main duct section 2M and opens the bypass section 2B. In this way, the vehicle dehumidifier supplies the outside air introduced from the outside air intake section 2P to the inside air. In other words, the vehicle interior can be ventilated.

In this way, in the above vehicle dehumidifier, as in each of the previously described embodiments, it is possible to improve the inside air circulation rate and reduce power consumption, while also providing further multi-functionality to the outside air and inside air circulation modes.

Sixth Embodiment
The dehumidifier for a vehicle shown in Fig. 6 has a basic configuration similar to that of the fifth embodiment (see Fig. 5), and the outside air duct 1 and the inside air duct 2 are provided with an outside air flow rate sensor S3 and an inside air flow rate sensor S4 that detect the flow rates of the outside air and the inside air, respectively, upstream of the gas separation membrane 3. In particular, the inside air flow rate sensor S4 is disposed between the most upstream opening/closing valve V9 and the opening/closing valve V6 at the upstream end of the bypass section 2B.

In the above-described vehicle dehumidifier, the control unit (symbol C in FIG. 1) controls the opening and closing of each of the on-off valves V6, V8, and V9 based on detection signals from the outside air temperature and humidity sensor S1, the inside air temperature and humidity sensor S2, the outside air flow rate sensor S3, and the inside air flow rate sensor S4.

The above-mentioned vehicle dehumidifier can adjust the gas flow rate flowing into the gas separation membrane 3 by controlling the opening and closing of each on-off valve V6, V8, and V9 based on the temperature and humidity of the outside air and inside air, and the flow rates of the outside air and inside air. This allows the above-mentioned vehicle dehumidifier to achieve high accuracy in the opening and closing control, and can contribute to further improving the inside air circulation rate and further reducing power consumption.

Seventh embodiment
The vehicle dehumidifier shown in Fig. 7 has the same basic configuration as that of the sixth embodiment (see Fig. 6), and the outside air duct 1 and the inside air duct 2 are provided with blowers B1 and B2 for controlling the flow rates of the outside air and the inside air, respectively, upstream of the gas separation membrane 3. The blowers B1 and B2 are, for example, fans. In this case, the control unit (symbol C in Fig. 1) controls the opening and closing of the opening and closing valves V6, V8, and V9 based on detection signals from the outside air temperature and humidity sensor S1 and the inside air temperature and humidity sensor S2, and also controls the rotation of the blowers B1 and B2.

The above-mentioned vehicle dehumidifier controls the opening and closing of each on-off valve V6, V8, and V9 based on the temperature and humidity of the outside and inside air, and controls the rotation of the blowers B1 and B2, thereby adjusting the gas flow rate flowing into the gas separation membrane 3. This allows the above-mentioned vehicle dehumidifier to achieve high accuracy in the opening and closing control, and can contribute to further improving the inside air circulation rate and further reducing power consumption.

Eighth embodiment
The vehicle dehumidifier shown in Figure 8 has a basic configuration similar to that of the sixth embodiment (see Figure 6), and the outside air duct 1 and the inside air duct 2 are provided with air filters Q1, Q2 upstream of the gas separation membrane 3 for removing fine particles contained in the outside air and the inside air.

The above-mentioned vehicle dehumidifier provides the same action and effect as the first embodiment, and by removing fine particles contained in the outside air and inside air with each air filter Q1, Q2, it is possible to prevent deterioration of the performance of the gas separation membrane 3, which can contribute to further improvement of the inside air circulation rate and further reduction of power consumption.

Ninth embodiment
The vehicle dehumidifier shown in Figure 9 has a basic configuration similar to that of the sixth embodiment (see Figure 6), and the outside air duct 1 and the inside air duct 2 are provided with water vapor adsorbents Q3, Q4 upstream of the gas separation membrane 3, which adsorb water vapor contained in the outside air and the inside air.

The above-described vehicle dehumidifier provides the same actions and effects as the first embodiment, and by removing water vapor contained in the outside air and inside air with each water vapor adsorbent Q3, Q4, the dehumidification effect can be further enhanced, which can contribute to further improving the inside air circulation rate and further reducing power consumption.

Tenth Embodiment
The vehicle dehumidifier shown in Figure 10 has a basic configuration similar to that of the sixth embodiment (see Figure 6), and the outside air duct 1 and the inside air duct 2 are provided with carbon dioxide adsorbents Q4, Q6 upstream of the gas separation membrane 3 to reduce carbon dioxide contained in the outside air and the inside air.

The above-described vehicle dehumidifier provides the same actions and effects as the first embodiment, and can reduce the carbon dioxide concentration by removing carbon dioxide contained in the outside air and inside air with each carbon dioxide adsorbent Q5, Q6, which can contribute to further improving the inside air circulation rate and further reducing power consumption.

Eleventh Embodiment
The vehicle dehumidifier shown in Fig. 11 has the same basic configuration as the sixth embodiment (see Fig. 6), and also has outside air temperature and humidity sensors S1, S5 and inside air temperature and humidity sensors S2, S6 disposed on both the upstream and downstream sides of the gas separation membrane 3 in the outside air duct 1 and the inside air duct 2. In this case, the control unit (symbol C in Fig. 1) controls the opening and closing of the on-off valves V6, V8, V9 based on the detection signals of the outside air temperature and humidity sensors S1, S5 and the inside air temperature and humidity sensors S2, S6.

The above-described vehicle dehumidifier provides the same functions and effects as the first embodiment, and realizes high-precision control of the opening and closing of each of the opening and closing valves V6, V8, and V9, and can contribute to further improving the internal air circulation rate and further reducing power consumption.

The configuration of the vehicle dehumidifier according to the present invention can be modified as appropriate without departing from the spirit of the present invention, and it is also possible to combine the configurations described in the above embodiments.

REFERENCE SIGNS LIST 1 Outside air duct 1A Branching section 1B, 2B Bypass section 1M, 2M Main duct section 2 Inside air duct 2P Outside air intake section 3 Gas separation membrane B1, B2 Blower C Control section Q1, Q2 Air filter Q3, Q4 Water vapor adsorbent Q5, Q6 Carbon dioxide adsorbent S1, S5 Outside air temperature and humidity sensor S2, S6 Inside air temperature and humidity sensor S3 Outside air flow rate sensor S4 Inside air flow rate sensor V1 to V9 Opening and closing valves

Claims (11)

an outside air duct that forms a flow path through which outside air introduced from outside the vehicle compartment flows to reach the outside of the vehicle compartment ;
an inside air duct that forms a flow path for circulating inside air introduced from an inside of the vehicle compartment to the inside of the vehicle compartment ;
a gas separation membrane that is disposed between the flow paths of the outside air duct and the inside air duct and exchanges gas due to a humidity difference between the inside and outside of the vehicle interior;
an outside air temperature and humidity sensor for detecting the temperature and humidity of the outside air introduced from outside the vehicle compartment in the outside air duct ;
an inside air temperature and humidity sensor for detecting the temperature and humidity of the inside air introduced from the inside of the vehicle cabin in the inside air duct ,
At least the inside air duct of the outside air duct and the inside air duct is provided with an on-off valve that opens and closes a flow path,
a control unit that controls opening and closing of the on-off valve based on detection signals from the outside air temperature and humidity sensor and the inside air temperature and humidity sensor. an outside air duct that forms a flow path for outside air introduced from outside the vehicle cabin;
an inside air duct that forms a flow path for inside air introduced from inside the vehicle cabin;
a gas separation membrane that is disposed between the flow paths of the outside air duct and the inside air duct and exchanges gas due to a humidity difference between the inside and outside of the vehicle interior;
An outside temperature and humidity sensor and an inside temperature and humidity sensor are provided to detect the temperature and humidity inside and outside the vehicle.
At least the inside air duct of the outside air duct and the inside air duct is provided with an on-off valve that opens and closes a flow path,
a control unit that controls opening and closing of the on-off valve based on detection signals of the outside air temperature and humidity sensor and the inside air temperature and humidity sensor,
the outside air duct includes a branch portion that communicates with the inside air duct downstream of the gas separation membrane, and an on-off valve that opens and closes a flow path downstream of the branch portion,
a gas separation membrane disposed downstream of the inside air duct; a valve for switching between opening and closing of both the inside air duct and the branching portion ; 3. The vehicle dehumidifier according to claim 1, wherein the outside air duct and the inside air duct are provided with the on-off valve for opening and closing a flow path upstream of the gas separation membrane. the outside air duct includes a branch portion that communicates with the inside air duct downstream of the gas separation membrane, and an on-off valve that opens and closes a flow path downstream of the branch portion,
4. The vehicle dehumidifier according to claim 1 , wherein the inside air duct is provided with an on-off valve downstream of the gas separation membrane for switching between opening and closing both of the flow paths of the inside air duct and the branch portion. At least one of the outside air duct and the inside air duct includes a main duct portion in which the gas separation membrane is disposed and a bypass portion which is a detour path for the main duct portion,
The dehumidifier for a vehicle according to any one of claims 1 to 4 , characterized in that an on-off valve for switching between opening and closing both of the flow paths of the main duct portion and the bypass portion is provided at an upstream end and a downstream end of the bypass portion. 6. The vehicle dehumidifier according to claim 5, wherein the inside air duct is provided with an outside air inlet portion for introducing outside air, and an opening/closing valve for switching between opening and closing of both the inside air duct and the outside air inlet portion , upstream of the gas separation membrane. A dehumidifier for a vehicle as described in any one of claims 1 to 6, characterized in that the outside air temperature and humidity sensor and the inside air temperature and humidity sensor are respectively arranged upstream of the gas separation membrane in the outside air duct and the inside air duct. 8. The vehicle dehumidifier according to claim 7, wherein the outside air temperature and humidity sensor and the inside air temperature and humidity sensor are arranged not only upstream of the gas separation membrane in the outside air duct and the inside air duct, but also downstream of the gas separation membrane in the inside air duct. the outside air duct and the inside air duct are provided with an outside air flow rate sensor and an inside air flow rate sensor, which are located upstream of the gas separation membrane and detect the flow rates of the outside air and the inside air, respectively;
The dehumidifier for a vehicle according to any one of claims 1 to 8, characterized in that the control unit controls the opening and closing of each opening and closing valve based on detection signals from the outside air temperature and humidity sensor, the inside air temperature and humidity sensor, the outside air flow sensor, and the inside air flow sensor. The dehumidifier for a vehicle according to any one of claims 1 to 9, characterized in that the outside air duct and the inside air duct are provided with a blower upstream of the gas separation membrane for controlling the flow rate of each of the outside air and the inside air. The dehumidifier for a vehicle according to any one of claims 1 to 10, characterized in that the outside air duct and the inside air duct are provided, upstream of the gas separation membrane, with at least one of an air filter for removing fine particles contained in the outside air and the inside air, a water vapor adsorbent for adsorbing water vapor contained in the outside air and the inside air, and a carbon dioxide adsorbent for reducing carbon dioxide contained in the outside air and the inside air.

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