Vehicle air conditioning system

Abstract

To provide an air conditioner for a vehicle that can extend the cycle of filter maintenance and improve the efficiency of filter maintenance.SOLUTION: The air conditioner for a vehicle includes a housing 200 having an intake port 210 and an exhaust port 220 leading to the cabin PR, an interior fan 140 forming an airflow from the intake port 210 to the exhaust port 220, an interior heat exchanger 120 arranged at a position through which the airflow passes, a charged filter 50 for collecting dust, a filter housing section 60 that houses the charged filter 50, an airtight member 53 that seals the space between the filter housing section 60 and the charged filter 50, a machine room maintenance section 80 that opens up the internal space Sa of the housing 200, and a filter maintenance section 70 that opens up the filter housing section 60. The filter housing 60 is located upstream of the airflow from an indoor heat exchanger 120. The filter maintenance section 70 is located at a position where the charged filter 50 housed in the filter housing 60 together with the airtight member 53 are exposed to the outside.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioner for a vehicle. [Background Art]

[0002] As disclosed in Patent Document 1 and Patent Document 2, an air conditioner including a filter that removes dust contained in air is known. The filter is housed inside the air conditioner together with an air conditioner that constitutes a refrigeration cycle. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2002-103960 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2006-90570 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] A vehicle air conditioner conditions air in a vehicle compartment that contains a large amount of dust. The vehicle air conditioner increases the supply amount of conditioned air to the vehicle compartment by increasing the flow velocity of an air flow of air taken into the interior from the vehicle compartment.

[0005] When the filters disclosed in Patent Document 1 and Patent Document 2 are applied to a vehicle air conditioner, the flow rate of air passing through the filter increases. Therefore, clogging of the filter with dust can occur in a short period of time. Accordingly, the maintenance cycle of the filter is shortened.

[0006] Further, when performing maintenance on the filter, it is necessary each time to widely open the entire vehicle air conditioner and work around the air conditioner housed inside. As a result, there is a concern that the efficiency of filter maintenance may deteriorate.

[0007] The purpose of this disclosure is to provide a vehicle air conditioning system that can extend the maintenance cycle of the filter and improve the efficiency of filter maintenance. [Means for solving the problem]

[0008] In order to achieve the above objective, the vehicle air conditioning system relating to this disclosure is A housing having an air intake and exhaust port leading to the passenger compartment, The interior space of the enclosure includes an indoor fan that forms an airflow from the intake port to the exhaust port, In the internal space of the enclosure, an indoor heat exchanger is positioned at a location through which the airflow passes, A statically charged filter for collecting dust contained in the aforementioned airflow, A filter housing section for housing the aforementioned electrostatic filter, An airtight member that seals the space between the filter housing and the electrostatic filter, A machine room maintenance section that allows the internal space to be opened to the outside of the housing, The system includes a filter maintenance section that allows the filter housing to be opened to the outside of the housing, The filter housing is positioned upstream of the indoor heat exchanger in the airflow. The filter maintenance unit is provided in a position where, with the filter housing open, the electrostatic filter, which is housed in the filter housing together with the airtight member, is exposed to the outside of the housing. Occasionally, The aforementioned charge filter is The filter part, which has been charged by friction, A frame portion that surrounds the outer periphery of the filter portion and is bonded to the filter portion, It has, A reinforcing member extending in a grid pattern is provided on the filter surface through which the airflow passes in the filter section. The dimension of the filter section in the airflow direction, which is the direction in which the airflow passes through the filter surface, is the same as the dimension of the frame section in the airflow direction. The filter housing section is A base plate having a vent formed through which the aforementioned airflow passes, A filter fixing member for fixing the electrostatic filter to the base plate at the position where the ventilation opening is formed, It has, The filter fixing member is The main body portion extends from the base plate in the direction of airflow passage, A flange extending from the end of the main body that is furthest from the base plate with respect to the airflow direction, in a direction perpendicular to the airflow direction, It has, The flange faces not only the frame portion but also the end of the filter surface in the filter portion in the direction of airflow passage. . Effects of the Invention

[0009] According to the above configuration, the charged filter electrically attracts and collects dust contained in the air in the vehicle compartment. Therefore, the space between the fibers of the filter can be made less dense than that of an uncharged filter that physically filters dust. Accordingly, clogging is less likely to occur in a short period of time. As a result, the maintenance cycle of the filter is extended. Further, when maintaining the charged filter, the filter accommodating portion that accommodates the charged filter can be directly accessed from the filter maintenance portion. Therefore, there is no need to open the device widely. Accordingly, the maintenance efficiency of the charged filter is improved. Brief Description of the Drawings

[0010] [Figure 1] Perspective view showing an installation aspect of the vehicle air conditioner according to Embodiment 1 [Figure 2] Cross-sectional view taken along line I-I in FIG. 1, showing the configuration of the vehicle air conditioner according to Embodiment 1 [Figure 3] Partially enlarged cross-sectional view taken along line II-II in FIG. 1, showing the configuration of the vehicle air conditioner according to Embodiment 1 [Figure 4] Perspective view of the charged filter according to Embodiment 1 [Figure 5] Schematic front view of a nonwoven fabric forming the filter portion of the charged filter according to Embodiment 1 [Figure 6] Perspective view showing a state where the charged filter is accommodated in the filter accommodating portion according to Embodiment 1 [Figure 7] Partially enlarged cross-sectional view taken along line III-III in FIG. 6, showing a state where the charged filter is accommodated in the filter accommodating portion according to Embodiment 1 [Figure 8]A schematic cross-sectional view at the position of line II-II in Figure 1, showing the open / closed state of the equipment maintenance section according to Embodiment 1. [Figure 9] A schematic cross-sectional view at the position of line II-II in Figure 1, showing the open / closed state of the filter maintenance unit according to Embodiment 1. [Figure 10] A cross-sectional view at the position of line II-II in Figure 1, partially enlarged, showing the open / closed state of the filter maintenance unit according to Embodiment 2. [Figure 11] Cross-sectional view at the position of line II in Figure 1, showing the configuration of the vehicle air conditioning system according to Embodiment 3. [Figure 12] A schematic cross-sectional view at the position of line II in Figure 1, partially enlarged, showing the open / closed state of the equipment maintenance section according to Embodiment 3. [Figure 13] A partially enlarged bottom view of the configuration of the vehicle air conditioning system according to Embodiment 3. [Figure 14] A schematic cross-sectional view at the position of line II in Figure 1, partially enlarged, showing the open / closed state of the filter maintenance unit according to Embodiment 3. [Figure 15] This schematic diagram shows the filter maintenance section according to Embodiment 3 in the open state shown in Figure 14, with the electrostatically charged filter housed in the filter housing exposed to the outside from the filter maintenance section. [Figure 16] (a) is a front view showing the first and second electrostatic filter elements of the electrostatic filter according to Embodiment 4 separately, and (b) is a front view showing the first and second electrostatic filter elements of the electrostatic filter according to Embodiment 4 joined together. [Figure 17] A perspective view showing the state in which the first and second electrostatic filter elements of the electrostatic filter according to Embodiment 4 are joined together. [Figure 18] (a) is a schematic cross-sectional view at the position of line III-III in Figure 6, showing the state before the electrostatic filter is housed in the filter housing according to Embodiment 5, and (b) is a schematic cross-sectional view at the position of line III-III in Figure 6, showing the state after the electrostatic filter is housed in the filter housing according to Embodiment 5. [Figure 19]Cross-sectional view at the position of line II in Figure 1, showing the configuration of the vehicle air conditioning system according to Embodiment 6. [Figure 20] (a) is a schematic cross-sectional view at the position of line III-III in Figure 6, showing the state before the electrostatic filter and pre-filter are housed in the filter housing according to Embodiment 7, and (b) is a schematic cross-sectional view at the position of line III-III in Figure 6, showing the state after the electrostatic filter is housed in the filter housing according to Embodiment 7. [Figure 21] A schematic plan view showing the configuration of the filter housing according to Embodiment 8. [Figure 22] A partially enlarged cross-sectional view at the position of line III-III in Figure 6, showing the state in which the electrostatic filter is housed in the filter housing according to Embodiment 9. [Modes for carrying out the invention]

[0011] The following description of the vehicle air conditioning system according to the embodiment will be given with reference to the drawings, using the case where the above vehicle is a railway vehicle as an example. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

[0012] [Embodiment 1] As shown in Figure 1, the vehicle air conditioning system 800 according to this embodiment is mounted on the roof portion RF of the railway vehicle 900. The railway vehicle 900 has a passenger compartment PR defined inside for passengers to ride in. The passenger compartment PR is a passenger compartment for accommodating passengers.

[0013] As shown in Figure 2, the vehicle air conditioning system 800 takes in the interior air PA, which is the air from the passenger compartment PR, and supplies conditioned air CA to the passenger compartment PR. The vehicle air conditioning system 800 comprises an air conditioner 100 that constitutes a refrigeration cycle and a housing 200 that houses the air conditioner 100.

[0014] The air conditioner 100 includes a compressor (not shown) for compressing the refrigerant, an outdoor heat exchanger 110 for condensing the compressed refrigerant, an expander (not shown) for expanding the condensed refrigerant, and an indoor heat exchanger 120 for evaporating the expanded refrigerant. The air conditioner 100 can also be configured to have the indoor heat exchanger 120 function as a condenser and the outdoor heat exchanger 110 function as an evaporator by reversing the flow of the refrigerant inside.

[0015] Furthermore, the air conditioner 100 has an outdoor fan 130 that forms an airflow that hits the outdoor heat exchanger 110. The airflow formed by the outdoor fan 130 promotes heat exchange between the outside air OA, which is the outside air EX of the railway vehicle 900, and the outdoor heat exchanger 110. The heat-exchanged outside air OA becomes heated or cooled exhaust.

[0016] Furthermore, the air conditioner 100 has an indoor fan 140 that forms an airflow that hits the indoor heat exchanger 120. The airflow formed by the indoor fan 140 promotes heat exchange between the indoor air PA and the indoor heat exchanger 120. The heat-exchanged indoor air PA becomes cooled or heated conditioned air CA.

[0017] The internal space of the enclosure 200 is divided into an indoor unit room Sa and an outdoor unit room Sb by a partition wall 150.

[0018] The indoor unit room Sa houses an indoor heat exchanger 120 and an indoor fan 140. The indoor unit room Sa communicates with the passenger compartment PR through an intake port 210 and an exhaust port 220 formed in the housing 200. The indoor air PA from the passenger compartment PR is drawn into the indoor unit room Sa through the intake port 210. The conditioned air CA from the indoor unit room Sa is blown into the passenger compartment PR through the exhaust port 220.

[0019] Furthermore, the indoor unit room Sa is connected to the external EX of the railway vehicle 900 by a fresh air inlet 230 and a fresh air outlet 240 formed in the housing 200. From the fresh air inlet 230, outside air OA from the external EX of the railway vehicle 900 is introduced into the indoor unit room Sa. The outside air OA introduced into the indoor unit room Sa is mixed with the internal air PA. From the fresh air outlet 240, a portion of the internal air PA taken in from the passenger compartment PR to the indoor unit room Sa is blown out to the external EX of the railway vehicle 900.

[0020] The outdoor unit room Sb houses a compressor (not shown), an expander (not shown), an outdoor heat exchanger 110, and an outdoor fan 130. The outdoor unit room Sb communicates with the exterior EX of the railway vehicle 900 through an outside air intake 250 and an outside air exhaust port 260 formed in the housing 200. Outside air OA is taken into the outdoor unit room Sb from the outside air intake 250. Exhaust from the outdoor unit room Sb is blown out to the exterior EX of the railway vehicle 900 from the outside air exhaust port 260.

[0021] Furthermore, in the railway vehicle 900, an intake duct space Sc of the intake duct 30 and an intake duct space Sd of the supply duct 40 are defined between the indoor unit room Sa and the passenger compartment PR. The intake duct 30 and the supply duct 40 each have a return port 300 and an outlet port 400 leading to the passenger compartment PR.

[0022] The intake duct 30 is connected to the intake port 210. The intake duct space Sc is connected to the passenger compartment PR via the return port 300 and to the indoor unit room via the intake port 210. The intake duct space Sc guides the interior air PA from the passenger compartment PR, which is taken in from the return port 300, to the intake port 210. The interior air PA that has been guided through the intake duct space Sc is then drawn into the indoor unit room Sa from the intake port 210.

[0023] The air supply duct 40 is connected to the exhaust port 220 of the housing 200. The air supply duct space Sd is connected to the indoor unit room via the exhaust port 220 and to the passenger compartment PR via the air outlet 400. The air supply duct space Sd guides the conditioned air CA flowing out from the exhaust port 220 to the passenger compartment PR. The conditioned air CA that has been guided through the air supply duct space Sd is then blown out into the passenger compartment PR from the air outlet 400.

[0024] Specifically, in the intake duct space Sc, the indoor unit room Sa, and the supply duct space Sd, an airflow is formed by the indoor fan 140, causing the interior air PA to flow from the return port 300 to the outlet 400. The interior air PA contains dust floating in the vehicle room PR. This dust includes suspended particulate matter with a particle radius of 10 μm or less, such as viruses and bacteria.

[0025] Typical vehicle air conditioning systems are equipped with non-static filters that physically filter out dust contained in the interior air to maintain a hygienic environment in the passenger compartment. The filter is fixed to a frame that has filter retainers that cover the filter surface in a grid pattern. The filter retainers prevent the filter from bending due to airflow.

[0026] The uncharged filters are positioned where the airflow of the internal PA (Pollutant Air) passes through. Furthermore, the uncharged filters have a larger basis weight to enhance dust collection efficiency and mechanical strength. The basis weight of the filters is, for example, 140-260 g / m². 2 That is the case.

[0027] When airflow passes through such an uncharged filter, the filter retainer obstructs the airflow. As a result, pressure loss may occur in the airflow from the return port 300 to the air outlet 400. Consequently, the air conditioning capacity of the vehicle air conditioning system 800 may decrease.

[0028] Furthermore, non-charged filters can quickly become clogged by dust particles with a larger particle radius than the suspended particulate matter contained in the indoor PA system. On the other hand, if the basis weight of a non-charged filter is reduced, it becomes low-density and unable to filter out suspended particulate matter. Consequently, the dust collection efficiency deteriorates. In addition, the maintenance cycle for replacing clogged filters becomes shorter.

[0029] Furthermore, when performing filter maintenance, it is necessary to open the housing 200 of the vehicle air conditioning unit 800 wide, exposing the indoor unit room Sa to the outside of the housing 200 each time. Maintenance must then be performed while avoiding the air conditioner 100 housed in the indoor unit room Sa. As a result, there are concerns that the efficiency of filter maintenance may be reduced.

[0030] Therefore, the vehicle air conditioning system 800 according to this embodiment is equipped with a charged filter 50 that can maintain a high collection effect over a long period of time with low pressure loss compared to conventional non-charged filters. It is also equipped with a filter housing section 60 and a filter maintenance section 70 that can improve the efficiency of maintenance of the charged filter 50. These will be described below.

[0031] As shown in Figure 3, an exhaust port 220, a first intake port 211, and a second intake port 212 are formed in the lower wall 201 of the housing 200 in which the indoor unit room Sa is located. An indoor fan 140 is provided above the exhaust port 220.

[0032] The indoor heat exchanger 120 has a first indoor heat exchanger 121 and a second indoor heat exchanger 122 that are arranged facing each other. The first indoor heat exchanger 121 is located between the indoor fan 140 and the first air intake 211. The second indoor heat exchanger 122 is located between the indoor fan 140 and the second air intake 212.

[0033] The intake duct 30 has a first intake duct 31 and a second intake duct 32 that are spaced apart in the width direction of the railway vehicle 900. The first intake duct 31 and the second intake duct 32 are connected to a first intake port 211 and a second intake port 212, respectively.

[0034] The first intake duct space Sc1 and the second intake duct space Sc2 are connected to the passenger compartment PR by the first return port 301 and the second return port 302, respectively. An air supply duct 40 is positioned between the first intake duct 31 and the second intake duct 32.

[0035] In the first intake duct space Sc1, the indoor unit room Sa, and the supply duct space Sd, an airflow of indoor air PA is formed by the indoor fan 140, flowing from the first return port 301 towards the outlet 400. In addition, in the second intake duct space Sc2, the indoor unit room Sa, and the supply duct space Sd, an airflow of indoor air PA is formed, flowing from the second return port 302 towards the outlet 400.

[0036] At the location through which the airflow passes, an electrostatic filter 50, which electrically collects dust contained in the indoor air PA, is positioned and housed in a filter housing 60.

[0037] The electrostatic filter 50 includes a first electrostatic filter 501 and a second electrostatic filter 502. The filter housing 60 also includes a first filter housing 601 and a second filter housing 602, which house the first electrostatic filter 501 and the second electrostatic filter 502, respectively.

[0038] The first filter housing 601, the second filter housing 602, the first electrostatic filter 501, and the second electrostatic filter 502 are each positioned to close the first air intake port 211 and the second air intake port 212. The filter surfaces of the first electrostatic filter 501 and the second electrostatic filter 502 are each perpendicular to the direction of airflow.

[0039] Furthermore, the first filter housing 601 and the second filter housing 602, and the first electrostatic filter 501 and the second electrostatic filter 502 are each positioned upstream of the first indoor heat exchanger 121 and the second indoor heat exchanger 122 in the airflow.

[0040] Furthermore, the filter maintenance section 70 has a first filter maintenance section 701 and a second filter maintenance section 702, which allow the first filter housing section 601 and the second filter housing section 602, respectively, to be opened to the outside of the housing 200. The first filter maintenance section 701 and the second filter maintenance section 702 each integrally include the first filter housing section 601 and the second filter housing section 602.

[0041] The first filter maintenance section 701 and the second filter maintenance section 702 are positioned so that the first electrostatic filter 501 and the second electrostatic filter 502, which are housed in the first filter housing section 601 and the second filter housing section 602, are exposed to the outside of the housing 200. In other words, the first filter maintenance section 701 and the second filter maintenance section 702 are positioned to close the first air intake port 211 and the second air intake port 212.

[0042] Next, we will describe the specific configuration of the electrostatic filter 50. As shown in Figure 4, the electrostatic filter 50 has a filter portion 51 that is charged by friction and a frame portion 52 that surrounds and adheres to the outer circumference of the filter portion 51.

[0043] The filter section 51 is formed from a charged nonwoven fabric in a rectangular and pleated shape when viewed from the front. The nonwoven fabric of the filter section 51 is pre-charged by friction with a conductive brush (not shown). The filter section 51, which is charged by friction, electrically attracts and captures dust contained in the indoor air PA. Therefore, it can effectively capture suspended particulate matter of 10 μm or less contained in the indoor air PA. The filter section 51 has a filter surface 51a through which the airflow passes and an outer peripheral surface parallel to the direction of airflow.

[0044] The basis weight of the nonwoven fabric forming the filter section 51 is smaller than that of the nonwoven fabric of the non-charged filter that physically filters out dust. The basis weight of the nonwoven fabric forming the filter section 51 is, for example, 65-75 g / m². 2 Therefore, the filter section 51 is less prone to clogging by dust in a short period of time than a non-charged filter. As a result, the maintenance cycle for the charged filter 50 can be extended.

[0045] In other words, the electrostatic filter 50 attracts dust electrically even if its mesh is coarser than that of a non-electrostatic filter. Therefore, it is possible to collect dust at a level equal to or greater than that of a non-electrostatic filter. Thus, the electrostatic filter 50 achieves both the effect of reducing clogging by making the mesh coarser and the effect of improving capture efficiency by electrically attracting dust through electrostatic charging.

[0046] Furthermore, the filter portion 51 has a grid-like reinforcing member 51b on the filter surface 51a. As shown in Figure 5, the reinforcing member 51b is a net that extends in a grid pattern on the front-viewed fabric surface of the sheet-like nonwoven fabric 51c before it is formed into a pleated shape. This makes it possible to make the thickness of the nonwoven fabric 51c forming the filter portion 51 thinner than the thickness of the nonwoven fabric forming a conventional non-charged filter. In addition, the mechanical strength of the filter portion 51 is improved.

[0047] The frame portion 52 is the part that maintains the shape of the filter portion 51. The frame portion 52 is formed in a rectangular frame shape when viewed from the front using charged nonwoven fabric. In detail, the frame portion 52 has a first plate 52a and a second plate 52b extending parallel to each other, and a third plate 52c and a fourth plate 52d extending parallel to each other. The thickness of the frame portion 52 is the same as the thickness of the filter portion 51. The frame portion 52 is airtightly bonded to the outer surface of the filter portion 51 and is integrally fixed to the filter portion 51. The plate surfaces of each plate 52a-52d of the frame portion 52 and the opening surface of the frame portion 52, which is the surface where the filter surface 51a of the filter portion 51 inside the frame portion 52 is exposed, are perpendicular to each other.

[0048] The frame portion 52 improves the mechanical strength of the electrostatic filter 50. The filter portion 51 also has a reinforcing member 51b. That is, the frame portion 52 and the reinforcing member 51b suppress the bending of the filter portion 51 when the internal air PA passes through it. In addition, the filter surface 51a of the electrostatic filter 50 is not covered by the frame portion 52. Therefore, the pressure loss of the airflow passing through the filter portion 51 is reduced. Furthermore, the space between the filter portion 51 and the frame portion 52 is welded and airtight. Therefore, airflow cannot escape from between the filter portion 51 and the frame portion 52.

[0049] Furthermore, airtight members 53 are provided on the outer surfaces 520a and 520b of the first plate 52a and second plate 52b of the frame portion 52 of the electrostatic filter 50, respectively, and are positioned between the filter housing portion 60 and the electrostatic filter 50. The airtight members 53 are provided on the outer surfaces 520a and 520b, extending in the direction of the width W of the frame portion 52 and in the central part of the thickness D of the frame portion 52. The airtight members 53 are resin packings.

[0050] As shown in Figure 7, the outer surfaces 520a and 520b of the frame portion 52 on which the airtight member 53 is provided are the surfaces facing each other, with the inner surfaces 621b and 622b of the first guide rail 621 and the second guide rail 622, respectively, which are parallel to each other in the filter housing portion 60 described later.

[0051] The airtight member 53 is elastically sandwiched between the frame portion 52 and the filter housing portion 60 when the electrostatic filter 50 is housed in the filter housing portion 60. As a result, the space between the filter housing portion 60 and the electrostatic filter 50 is airtight. Consequently, airflow cannot escape from between the electrostatic filter 50 and the filter housing portion 60.

[0052] Next, the configuration of the filter housing 60 will be described. As shown in Figure 6, the filter housing section 60 has a rectangular base plate 61 and filter fixing members 62 for housing and fixing the electrostatic filter 50. Two filter fixing members 62 are provided adjacent to each other on the base plate 61.

[0053] The base plate 61 is formed from a rectangular plate material with the same area as the opening surfaces of the first air intake port 211 and the second air intake port 212.

[0054] The filter fixing member 62 is a pair of first guide rails 621 and second guide rails 622 that extend parallel to each other. The first guide rails 621 and second guide rails 622 extend spaced apart from the surface of the base plate 61. The distance between the first guide rail 621 and the second guide rail 622 is the same as the height H of the electrostatic filter 50 shown in Figure 4.

[0055] As shown in Figures 6 and 7, the first guide rail 621 and the second guide rail 622 each have a first flange 621a and a second flange 622a at their upper ends, which abut against the thickness-direction surface of the frame portion 52 of the electrostatic filter 50.

[0056] The first flange 621a and the second flange 622a are formed to protrude inward from each other. The distance from the surface of the base plate 61 to the bottom surfaces of the first flange 621a and the second flange 622a is the same as the thickness D of the electrostatic filter 50 shown in Figure 4. That is, the first guide rail 621 and the second guide rail 622 each form grooves into which both ends of the electrostatic filter 50 are inserted, by the surface of the base plate 61 and the first flange 621a and the second flange 622a.

[0057] Furthermore, the lengths of the first guide rail 621 and the second guide rail 622 are at least twice the width D of the electrostatic filter 50 shown in Figure 4. Between the first guide rail 621 and the second guide rail 622, two electrostatic filters 50 are arranged side by side in the direction of extension of the guide rails 621 and 622.

[0058] A filter insertion opening 63 is formed at one end of the first guide rail 621 and the second guide rail 622 in their respective extending directions, into which a static charge filter 50 is inserted between the guide rails 621 and 622. The static charge filter 50 inserted through the filter insertion opening 63 is movable between the first guide rail 621 and the second guide rail 622 in their extending direction.

[0059] Filter restricting portions 641 and 642 are formed at the other ends in the extending direction of the first guide rail 621 and the second guide rail 622, respectively, against which the corners of the electrostatic filter 50 moving between them abut. This allows for the positioning of the electrostatic filter 50 between the first guide rail 621 and the second guide rail 622.

[0060] Furthermore, the base plate 61 has a vent 61a for airflow to pass through. The vent 61a is formed in the portion where the filter portion 51 of the electrostatic filter 50, which is positioned between the first guide rail 621 and the second guide rail 622, is located. The area of ​​the opening surface of the vent 61a is the same as the area of ​​the opening surface of the frame portion 52. The frame portion 52 of the electrostatic filter 50 is in contact with the plate surface of the opening edge of the vent 61a.

[0061] Furthermore, the filter housing section 60 has the base plate 61 positioned upstream of the filter fixing member 62 in the airflow direction. The vents 61a of the base plate 61 are positioned perpendicular to the direction of airflow. That is, the base plates 61 of the first filter maintenance section 701 and the second filter maintenance section 702 are positioned on the side where the passenger compartment PR is located at the first air intake 211 and the second air intake 212.

[0062] Next, the filter maintenance unit 70 will be described. As shown in Figure 2, the vehicle air conditioning system 800 is provided with a separate machine room maintenance section 80 and a filter maintenance section 70.

[0063] The machine room maintenance section 80 is a part that is opened when performing maintenance on the air conditioner 100, such as cleaning or replacing the indoor fan 140, the first indoor heat exchanger 121, and the second indoor heat exchanger 122, which are housed in the indoor machine room Sa.

[0064] The machine room maintenance section 80 is formed in the upper wall 202, which is the roof portion of the vehicle air conditioning unit 800. As shown in Figures 3 and 8, the machine room maintenance section 80 is equipped with a large main hatch 82 that opens and closes an equipment maintenance opening 81 leading to the indoor machine room Sa.

[0065] The equipment maintenance opening 81 is formed in most of the upper wall 202 where the indoor unit room Sa of the housing 200 is located. The main hatch 82 is provided so as to be rotatable vertically around one side edge of the equipment maintenance opening 81.

[0066] When the air conditioner 100 is not being maintained, the main hatch 82 seals the equipment maintenance opening 81 airtight. An airtight member (not shown) is provided between the main hatch 82 and the opening edge of the equipment maintenance opening 81.

[0067] When performing maintenance on the air conditioner 100, the main hatch 82 rotates upward on one side edge, opening the equipment maintenance opening 81. Through the opened equipment maintenance opening 81, the air conditioner 100, housed in the indoor unit room Sa, is exposed to the outside.

[0068] This allows easy access from the equipment maintenance opening 81 to the indoor fan 140, first indoor heat exchanger 121, and second indoor heat exchanger 122 of the air conditioner 100 housed in the indoor unit room Sa. Therefore, maintenance of the air conditioner 100 can be performed.

[0069] The filter maintenance section 70 is a part that is opened when performing maintenance on the electrostatic filter 50, such as checking the state in which the electrostatic filter 50 and the airtight member 53 are housed in the filter housing section 60, replacing the electrostatic filter 50, or cleaning the electrostatic filter.

[0070] As shown in Figure 9, the filter maintenance unit 70 includes a first filter maintenance unit 701 that is opened when maintaining the first charged filter 501, and a second filter maintenance unit 702 that is opened when maintaining the second charged filter 502.

[0071] The first filter maintenance section 701 and the second filter maintenance section 702 each include a first filter housing section 601 and a second filter housing section 602 that open and close the first air intake port 211 and the second air intake port 212, respectively.

[0072] The first filter housing 601 of the first filter maintenance unit 701 is provided so as to be rotatable in the vertical direction within the first intake duct space Sc1 between the first intake port 211 and the first return port 301, centered on one side edge of the first intake port 211.

[0073] In detail, the first filter housing 601 is rotatably mounted on the end of the base plate 61 opposite to the end where the filter insertion port 63 is located, around one side edge of the first air intake port 211. The surface of the base plate 61 is oriented tangentially to the direction when the first filter housing 601 is rotated around one side edge of the first air intake port 211.

[0074] Furthermore, the second filter housing section 602 of the second filter maintenance section 702 is provided so as to be rotatable in the vertical direction within the second intake duct space Sc2 between the second intake port 212 and the second return port 302, centered on one side edge of the second intake port 212.

[0075] In detail, the second filter housing 602 is located at the end of the base plate 61 opposite to the end where the filter insertion port 63 is located, and is rotatable around one side edge of the second air intake port 212. The surface of the base plate 61 is oriented tangentially to the direction when the second filter housing 602 is rotated around one side edge of the second air intake port 212.

[0076] When the first electrostatic filter 501 and the second electrostatic filter 502 are not being maintained, the first filter housing 601 and the second filter housing 602, which house the filters 501 and 502, respectively, block the first air intake port 211 and the second air intake port 212.

[0077] When the first filter housing 601 and the second filter housing 602 are positioned to block the first air intake port 211 and the second air intake port 212, the base plates 61 of these filter housings 601 and 602 are located upstream of the airflow filter fixing member 62. Therefore, the first electrostatic filter 501 and the second electrostatic filter 502 are not exposed to the passenger compartment PR from the first air intake port 211 and the second air intake port 212.

[0078] When performing maintenance on the first electrostatic filter 501 and the second electrostatic filter 502, the first filter housing 601 and the second filter housing 602, which house the filters 501 and 502, are rotated downward around one side edge of the first air intake port 211 and the second air intake port 212, respectively.

[0079] The first filter housing 601 and the second filter housing 602, which have rotated downward around one side edge of the first air intake port 211 and the second air intake port 212, hang down from one side edge of the first air intake port 211 and the second air intake port 212 to the first air intake duct space Sc1 and the second air intake duct space Sc2 below them.

[0080] The hanging first filter housing 601 and second filter housing 602 are exposed to the vehicle interior PR through the first return port 301 and second return port 302, respectively. In other words, the first electrostatic filter 501 and second electrostatic filter 502, which are housed in the first filter housing 601 and second filter housing 602 respectively, are exposed to the outside of the housing 200.

[0081] This allows visual confirmation of the state in which the electrostatic filter 50 is housed in the filter housing 60 and the state in which the airtight member 53 is airtight between the filter housing 60 and the electrostatic filter 50. Furthermore, the first electrostatic filter 501 and the second electrostatic filter 502 housed in the first filter housing 601 and the second filter housing 602 can be easily accessed from there. In other words, when performing maintenance on the first filter housing 601 and the second filter housing 602, it is not necessary to open the machine room maintenance section 80. Also, since the filter insertion port 63 faces the vehicle room PR, it is easy to replace the electrostatic filter 50. Consequently, the efficiency of maintenance of the electrostatic filter 50 is improved.

[0082] [Embodiment 2] Figure 9 illustrates a configuration in which the filter maintenance unit 70 consists of a first filter housing 601 and a second filter housing 602 that open and close the first air intake port 211 and the second air intake port 212, respectively. However, the configuration of the filter maintenance unit 70 is not limited to this. Specific examples are described below.

[0083] As shown in Figure 10, the first filter maintenance unit 701 and the second filter maintenance unit 702 of this embodiment each include a first filter housing unit 601 and a second filter housing unit 602 that open and close the first return port 301 and the second return port 302, respectively.

[0084] The first filter housing 601 and the second filter housing 602 are each provided so as to be rotatable in the vertical direction around one side edge of the first return port 301 and the second return port 302, respectively.

[0085] After the first filter housing 601 and the second filter housing 602 each rotate downward around one side edge of the first return port 301 and the second return port 302, the filter housings 601 and 602 hang down from one side edge of the first return port 301 and the second return port 302 to the vehicle compartment PR below. In other words, the first filter housing 601 and the second filter housing 602 are fully exposed to the vehicle compartment PR, which is the outside of the housing 200.

[0086] As described above, in this embodiment as well, similar to Embodiment 1, the first filter housing 601 and the second filter housing 602 can be accessed without opening the machine room maintenance section 80. Therefore, access to the filter housings 601 and 602 becomes even easier. As a result, the efficiency of maintenance of the first electrostatic filter 501 and the second electrostatic filter 502 is further improved.

[0087] [Embodiment 3] Figure 2 illustrates a configuration in which a vehicle air conditioning unit 800 mounted on the roof section RF of a railway vehicle 900 is equipped with an electrostatic filter 50, a filter housing 60, and a filter maintenance unit 70. However, the vehicle air conditioning unit 800 equipped with the electrostatic filter 50, filter housing 60, and filter maintenance unit 70 is not limited to this configuration. Specific examples are described below.

[0088] As shown in Figure 11, the vehicle air conditioning system 800 of this embodiment is mounted on the underfloor portion UF of the railway vehicle 900. The housing 200 is provided in a state where it hangs down from the underfloor portion UF of the railway vehicle 900. The indoor unit room Sa of the housing 200 houses an indoor heat exchanger 120, an indoor fan 140, and an air supply fan 160. The air supply fan 160 is positioned at the fresh air inlet 230.

[0089] The electrostatic filter 50, while housed in the filter housing 60, is positioned so as to pass through the airflow of the indoor air PA flowing from the return port 300 towards the outlet 400.

[0090] The filter housing 60 is housed in the indoor unit room Sa and is located upstream of the indoor heat exchanger 120 and indoor fan 140 in the airflow. The filter housing 60 is located between the indoor fan 140 and the supply fan 160, and is positioned adjacent to the indoor fan 140.

[0091] As shown in Figure 12, the equipment maintenance opening 81 of the machine room maintenance section 80 is formed in most of the lower wall 201 where the indoor machine room Sa of the housing 200 is located. The main hatch 82 has a filter maintenance opening 71 and a fresh air outlet 240 that lead to the indoor machine room Sa. The main hatch 82 is provided so as to be rotatable vertically around one side edge of the equipment maintenance opening 81.

[0092] As shown in Figure 13, the machine room maintenance section 80 has a filter maintenance section 70. The filter maintenance section 70 is formed in the area where the filter housing section 60 of the main hatch 82 is located when the machine room maintenance section 80 is closed.

[0093] As shown in Figure 14, the filter maintenance section 70 has a sub-hatch 72 that opens and closes the filter maintenance opening 71 of the main hatch 82. The sub-hatch 72 is rotatably mounted around one side edge of the filter maintenance opening 71. A sealed member (not shown) is provided between the sub-hatch 72 and the opening edge of the filter maintenance opening 71.

[0094] When performing maintenance on the air conditioner 100, the main hatch 82 is rotated downward to open the equipment maintenance opening 81. Through the opened equipment maintenance opening 81, the air conditioner 100, which is housed in the indoor unit room Sa, is exposed to the outside.

[0095] This allows easy access from the equipment maintenance opening 81 to the indoor heat exchanger 120, indoor fan 140, and supply fan 160 housed in the indoor unit room Sa. Consequently, maintenance of the air conditioner 100 can be performed.

[0096] Furthermore, when performing maintenance on the electrostatic filter 50, the sub-hatch 72 rotates downward, opening the filter maintenance opening 71. The opened filter maintenance opening 71 partially opens the lower part of the indoor unit room Sa where the filter housing 60 is located to the outside of the housing 200.

[0097] That is, as shown in Figure 15, the electrostatic filter 50, which is housed in the filter housing 60, is exposed to the outside of the housing 200 from the filter maintenance section 70. This makes it possible to visually confirm that the electrostatic filter 50 is housed between the first guide rail 621 and the second guide rail 622 of the filter housing 60, and that the airtight member 53 is airtight between the filter housing 60 and the electrostatic filter 50.

[0098] Furthermore, the machine room maintenance section 80 does not need to be opened, and the filter housing section 60 can be easily accessed from the filter maintenance section 70. Consequently, the efficiency of maintenance of the electrostatic filter 50 is improved.

[0099] [Embodiment 4] Figure 4 illustrates a configuration in which the electrostatic filter 50 is formed by a filter section 51 and a frame section 52. However, the configuration of the electrostatic filter 50 is not limited to this. Specific examples are described below.

[0100] As shown in Figures 16(a) and 16(b), the electrostatic filter 50 of this embodiment has a first electrostatic filter element 510 and a second electrostatic filter element 520. The first electrostatic filter element 510 and the second electrostatic filter element 520 are formed to have the same shape, the same size, and the same basis weight.

[0101] The first charge filter element 510 has a rectangular first filter element portion 511 when viewed from the front, and a U-shaped first frame element portion 512 when viewed from the front, which is bonded to the three outer peripheral sides of the first filter element portion 511. That is, the first charge filter element 510 has one side surface 511a where the first frame element portion 512 is not provided.

[0102] Furthermore, the second charge filter element 520 has a rectangular second filter element portion 521 when viewed from the front, and a U-shaped second frame element portion 522 when viewed from the front, which is bonded to the three outer surfaces of the second filter element portion 521. That is, the second charge filter element 520 has one side surface 521a where the second frame element portion 522 is not provided.

[0103] As shown in Figure 17, the electrostatic filter 50 is formed by bonding the first electrostatic filter element 510 and the second electrostatic filter element 520 together with resin, with one side surface 511a and 521a of each being in contact. In other words, a hardened resin element fixing portion 530 extends from the joint portion between the first electrostatic filter element 510 and the second electrostatic filter element 520, that is, the central portion in the width direction D of the electrostatic filter 50.

[0104] The element fixing portion 530 plays the role of maintaining the shape of the electrostatic filter 50 at the boundary between the first filter element portion 511 and the second filter element portion 521. This further improves the mechanical strength of the electrostatic filter 50. In addition, the size of the electrostatic filter 50 can be changed using these first filter element portion 511 and second filter element portion 521.

[0105] [Embodiment 5] Figure 7 illustrates a configuration in which the filter fixing member 62 of the filter housing 60 is a pair of first guide rails 621 and second guide rails 622. However, the configuration of the filter housing 60 is not limited to this. Specific examples are described below.

[0106] As shown in Figures 18(a) and 18(b), the filter fixing member 62 of the filter housing 60 in this embodiment is a pair of first fixing plates 623 and second fixing plates 624. Each of the first fixing plate 623 and second fixing plate 624 is a metal strip. Each of the first fixing plate 623 and second fixing plate 624 extends parallel to and spaced apart from each other on the plate surface of the base plate 61.

[0107] The distance between the first fixing plate 623 and the second fixing plate 624 is slightly shorter than the height H of the electrostatic filter 50 shown in Figure 4. Also, the distance from the surface of the base plate 61 to the upper ends of the first fixing plate 623 and the second fixing plate 624, i.e., the width of the strip, is the same as the thickness D of the electrostatic filter 50 shown in Figure 4.

[0108] The upper ends of the first fixing plate 623 and the second fixing plate 624 each form a filter insertion opening 63 between the fixing plates 623 and 624, into which the electrostatic filter 50 is pushed toward the base plate 61.

[0109] The electrostatic filter 50, inserted through the filter insertion port 63, is elastically sandwiched and positioned between the first fixing plate 623 and the second fixing plate 624. Furthermore, the airtight member 53 provided on the frame portion 52 of the electrostatic filter 50 is in close contact with the filter housing portion 60 and the frame portion 52.

[0110] As a result, the space between the filter housing 60 and the electrostatic filter 50 is airtight. Therefore, airflow cannot escape from between the filter housing 60 and the electrostatic filter 50. As described above, in the filter housing 60 of this embodiment, the electrostatic filter 50 is housed while maintaining airtightness.

[0111] [Embodiment 6] The interior air PA of the vehicle's PR contains not only dust but also moisture and organic matter. When this moisture and organic matter adheres to the electrostatic filter 50, the electrostatic charge of the electrostatic filter 50 is lost, reducing its collection effect. Furthermore, if there is a large amount of dust with a larger particle radius than suspended particulate matter, the electrostatic filter 50 is more likely to clog prematurely. Therefore, this embodiment further includes a configuration that can extend the filter life of the electrostatic filter 50. A specific example is described below.

[0112] As shown in Figure 19, the vehicle air conditioning system 800 of this embodiment further includes a pre-filter 54. The pre-filter 54 is located upstream of the airflow electrostatic filter 50.

[0113] The pre-filter 54 is an activated carbon filter that removes organic matter, moisture, and dust particles with a larger particle radius than the suspended particulate matter contained in the indoor air PA. The pre-filter 54 is formed in a pleated shape using a nonwoven fabric containing activated carbon. The basis weight of the pre-filter 54 is smaller than that of the electrostatic filter 50.

[0114] Furthermore, the filter housing section 60 includes a static filter housing section 64 for housing the static filter 50 and a pre-filter housing section 65 for housing the pre-filter 54.

[0115] The pre-filter housing 65 is housed in the indoor unit room Sa and is located upstream of the airflow electrostatic filter housing 64. It is positioned between the electrostatic filter housing 64 and the supply fan 160, and is adjacent to the electrostatic filter housing 64.

[0116] As a result, the pre-filter 54 captures organic matter and moisture contained in the indoor air PA as the airflow passes through the pre-filter 54. Furthermore, when the airflow from which organic matter and moisture have been removed passes through the electrostatic filter 50, the electrostatic filter 50 collects dust contained in the indoor air PA.

[0117] Therefore, the electrostatic filter 50, which is located downstream of the pre-filter 54, is not affected by organic matter and moisture. As a result, the dust collection efficiency of the electrostatic filter 50 can be maintained. Consequently, the lifespan of the electrostatic filter 50 is extended.

[0118] Furthermore, the airflow is sequentially purified by the pre-filter 54 and the electrostatic filter 50. As a result, the air conditioner 100 can produce cleaner conditioned air CA.

[0119] Furthermore, when maintaining the electrostatic filter 50 and the pre-filter 54, the electrostatic filter housing 64 and the adjacent pre-filter housing 65 can be accessed from the filter maintenance unit 70. In other words, there is no need to open the machine room maintenance unit 80. Therefore, the efficiency of maintenance for both the electrostatic filter 50 and the pre-filter 54 is improved.

[0120] [Embodiment 7] Figure 19 illustrates a configuration in which the electrostatic filter 50 and the pre-filter 54 are housed in adjacent and separate electrostatic filter housings 64 and pre-filter housings 65, respectively. However, the pre-filter 54 may be integrated with the electrostatic filter 50 and housed in a single filter housing 60. Specific examples of this configuration are described below.

[0121] Figure 20(a) shows that the pre-filter 54 is formed in the shape of a thin sheet. The pre-filter 54 covers the filter surface 51a of the filter portion 51 of the electrostatic filter 50 on the base plate 61 side and is also bonded to the outer circumference of the frame portion 52.

[0122] Furthermore, as shown in Figure 20(b), the filter housing 60 has a pre-filter 54 on the base plate 61 side and a static filter 50 on the filter fixing member 62 side. The filter housing 60, like in Embodiment 5, has a base plate 61 and a pair of first fixing plates 623 and second fixing plates 624.

[0123] As described above, in this embodiment as well, the airflow passes sequentially through the pre-filter 54 and the electrostatic filter 50, similar to embodiment 6. Therefore, the dust collection efficiency of the electrostatic filter 50 can be maintained. Furthermore, there is no need to provide a separate pre-filter housing 65 to house the pre-filter 54. Therefore, the installation location of the pre-filter 54 can be reduced in space and cost.

[0124] [Embodiment 8] Figure 6 illustrates a configuration in which the filter housing 60 has a base plate 61 and a pair of first guide rails 621 and second guide rails 622. However, the configuration of the filter housing 60 is not limited to this. Specific examples are described below.

[0125] As shown in Figure 21, the filter housing 60 of this embodiment does not have the base plate 61 of Embodiment 1. That is, the filter housing 60 has a pair of first guide rails 621 and second guide rails 622 that extend parallel to each other and are filter fixing members 62.

[0126] The first guide rail 621 and the second guide rail 622 are spaced apart in the indoor unit room Sa. The direction of extension of each of the first guide rail 621 and the second guide rail 622 is perpendicular to the airflow direction of the indoor air PA.

[0127] Furthermore, the electrostatic filter 50 and the pre-filter 54 are erected on the surface of the slide plate 66. The slide plate 66 is a rectangular metal strip in plan view.

[0128] The electrostatic filter 50 and the pre-filter 54 are each provided in the central part of the width direction of the slide plate 66, perpendicular to the surface of the slide plate 66. The filter surfaces 51a and 54a of the electrostatic filter 50 and the pre-filter 54 are parallel to the first guide rail 621 and the second guide rail 622, respectively.

[0129] Furthermore, the first guide rail 621 and the second guide rail 622 support both ends of the slide plate 66 in the width direction. The slide plate 66, supported at both ends by the first guide rail 621 and the second guide rail 622, is movable in the direction of extension of the guide rails 621 and 622.

[0130] The electrostatic filter 50 and pre-filter 54, positioned between the first guide rail 621 and the second guide rail 622, are arranged so that their respective filter surfaces are perpendicular to the direction of airflow.

[0131] As described above, in this embodiment as well, the airflow passes sequentially through the pre-filter 54 and the electrostatic filter 50. Therefore, the dust collection efficiency of the electrostatic filter 50 can be maintained, and the lifespan of the electrostatic filter 50 can be extended.

[0132] Furthermore, since the filter housing 60 consists of a pair of first guide rails 621 and second guide rails 622 without a base plate 61, the structure of the filter housing 60 can be simplified. Consequently, installation of the filter housing 60 in the indoor unit room Sa becomes easier.

[0133] [Embodiment 9] Figure 7 illustrates a configuration in which one electrostatic filter is housed in one filter housing. However, the number of electrostatic filters housed in a filter housing is not limited to this. Specific examples are described below.

[0134] As shown in Figure 22, the electrostatic filter 50 of this embodiment has an upstream electrostatic filter 55 located upstream of the airflow and a downstream electrostatic filter 56 located downstream of the airflow. The upstream electrostatic filter 55 and the downstream electrostatic filter 56 are housed adjacent to each other in the filter housing 60 with their respective filter surfaces 55a and 56a facing each other.

[0135] The upstream electrostatic filter 55 and the downstream electrostatic filter 56 each have an upstream filter section 551 and a downstream filter section 561, and an upstream frame section 552 and a downstream frame section 562 that surround and bond the outer circumferences of the respective filter sections 551 and 561.

[0136] The upstream electrostatic filter 55 and the downstream electrostatic filter 56 are formed to be the same shape and size. However, the basis weight of the upstream electrostatic filter 55 and the downstream electrostatic filter 56 are different. Specifically, the basis weight of the nonwoven fabric forming the downstream filter section 561 is smaller than that of the nonwoven fabric forming the upstream filter section 551. For example, the basis weight of the upstream filter section 551 is 65-75 g / m². 2 In that case, the basis weight of the downstream filter section 561 is smaller than that.

[0137] According to this embodiment, as the airflow passes sequentially through the upstream electrostatic filter 55 and the downstream electrostatic filter 56, the upstream electrostatic filter 55 and the downstream electrostatic filter 56 collect dust through a blocking effect corresponding to the particle radius of the dust. That is, the upstream electrostatic filter 55 and the downstream electrostatic filter 56 each collect dust in stages according to the basis amount as the airflow passes through. As a result, the dust collection efficiency of the electrostatic filter 50 is further improved.

[0138] The embodiments have been described above. This disclosure is not limited thereto, and the following modifications are also possible.

[0139] Figure 2 illustrates a configuration in which the electrostatic filter 50 and filter housing 60 are positioned in the airflow of the indoor air PA from the return port 300 to the outlet 400. However, the position in which the electrostatic filter 50 and filter housing 60 are placed is not limited to this. The electrostatic filter 50 and filter housing 60 may be positioned, for example, in the airflow of the outdoor air OA from the fresh air inlet 230 to the outlet 400, the airflow of the indoor air PA from the return port 300 to the fresh air outlet 240, and the airflow of the outdoor air OA from the outdoor air intake 250 to the outdoor air outlet 260 of the outdoor unit room Sb. In other words, the electrostatic filter 50 may be placed in a position to collect dust contained in the outdoor air OA.

[0140] Furthermore, the electrostatic filter 50 and the filter housing 60 may be located downstream of the indoor heat exchanger 120 in the airflow. However, from the viewpoint of suppressing contamination of the indoor heat exchanger 120 and the indoor fan 140 by exposure to dust, it is preferable that the electrostatic filter 50 and the filter housing 60 be located upstream of the indoor heat exchanger 120 in the airflow.

[0141] Figure 4 illustrates a configuration in which the filter portion 51 of the electrostatic filter 50 is pleated. However, the shape of the electrostatic filter 50 is arbitrary as long as it can electrically capture dust contained in the indoor air PA. The shape of the filter portion 51 may be, for example, a flat sheet-like filter surface 51a, an embossed filter surface 51a with multiple bumps formed on it, a honeycomb-like filter surface 51a formed by polymerizing nonwoven fabric with multiple holes formed on it, or a corrugated filter surface 51a with a fine wave-like surface.

[0142] Furthermore, the filter portion 51 of the electrostatic filter 50 is not limited to being charged by friction, as long as it electrically collects dust. The filter portion 51 may, for example, be one that adheres charged particles to the fibers of the nonwoven fabric or one that polarizes the fibers of the nonwoven fabric. Also, the material of the frame portion 52 is not limited as long as the frame portion 52 can maintain the shape of the filter portion 51. The material of the frame portion 52 may be, for example, a resin plate, a paper plate, a metal plate, or a wooden plate.

[0143] Figure 6 illustrates a configuration in which the airtight member 53 is a resin strip-shaped packing that extends along the central portion of its thickness D and in the direction of the width W of the frame portion 52 on the outer surfaces 520a and 520b of the frame portion 52. However, the material, shape, and position of the airtight member 53 can be any configuration as long as it can create an airtight seal between the electrostatic filter 50 and the filter housing 60.

[0144] The material of the airtight member 53 may be, for example, a metal plate or paper. Furthermore, the airtight member 53 may extend in the direction of the width W of the frame portion 52 on its outer surfaces 520a and 520b, for example, in a wave shape or a double parallel line shape in a plan view. Also, the airtight member 53 may be provided on the entire outer surface of each plate 52a-52d of the frame portion 52, or it may be provided on a portion of the outer surfaces 520a and 520b, extending in the direction of the width W of the frame portion 52.

[0145] Figure 8 illustrates a configuration in which the machine room maintenance section 80 has a main hatch 82 that is rotatable vertically around one side edge of the equipment maintenance opening 81. However, the configuration is not limited to this, as long as the indoor machine room Sa can be opened to the outside EX of the housing 200 and closed from the outside EX. The machine room maintenance section 80 may, for example, have a removable cover over the equipment maintenance opening 81, or it may have a sliding cover that slides parallel to the opening surface of the equipment maintenance opening 81. Furthermore, the machine room maintenance section 80 may be designed to allow the outdoor machine room Sb to be opened together with the indoor machine room Sa.

[0146] Figure 12 illustrates a configuration in which the filter maintenance section 70 and the machine room maintenance section 80 are provided on the lower wall 201 of the housing 200. However, the locations in which they are provided are not limited, as long as the filter maintenance section 70 is formed in a position that opens the filter housing section 60 to the outside EX of the housing 200, and the machine room maintenance section 80 is formed in a position that opens the indoor machine room Sa to the outside EX of the housing 200. The filter maintenance section 70 and the machine room maintenance section 80 may be formed, for example, on the rear wall, left wall, or right wall of the housing 200.

[0147] Figures 16(a) and 16(b) illustrate an example in which the electrostatic filter 50 is formed by joining together two first electrostatic filter elements 510 and a second electrostatic filter element 520, which are formed to be the same shape, the same size, and the same basis weight. However, the shape, size, basis weight, and number of each of the first electrostatic filter element 510 and the second electrostatic filter element 520 are arbitrary, as long as the electrostatic filter 50 formed by these filter elements 510 and 520 can electrically collect dust.

[0148] Furthermore, Figure 17 illustrates a configuration in which the element fixing portion 530 joining the first charge filter element 510 and the second charge filter element 520 is made of hardened resin. However, the element fixing portion 530 can be any configuration as long as it improves the mechanical strength of the charge filter 50 and can join the first charge filter element 510 and the second charge filter element 520.

[0149] Figure 20 illustrates a configuration in which a thin, sheet-like pre-filter 54 completely covers the filter surface 51a of the filter portion 51 of the electrostatic filter 50 and is bonded to the outer circumference of the frame portion 52. However, the pre-filter 54 only needs to be positioned upstream of the filter surface 51a of the electrostatic filter 50 in the airflow.

[0150] The pre-filter 54 may be housed in the filter housing 60, for example, sandwiched between the outer circumference of the frame portion 52 and the filter housing portion 60, or it may be stretched only over the portion that covers the filter surface 51a on the upstream side of the electrostatic filter 50.

[0151] Figure 22 illustrates a configuration in which a single filter housing 60 contains two electrostatic filters 50, an upstream electrostatic filter 55 and a downstream electrostatic filter 56, each with the same thickness but different basis weights. However, the number, thickness, and basis weight can be any configuration as long as the electrostatic filters 50 can be housed in a single filter housing 60 and electrically capture dust.

[0152] The electrostatic filter 50 may also have, for example, a midstream filter positioned between the upstream electrostatic filter 55 and the downstream electrostatic filter 56, in addition to the upstream electrostatic filter 55 and the downstream electrostatic filter 56, or the thickness of the upstream electrostatic filter 55 may be greater than the thickness of the downstream electrostatic filter 56. Furthermore, the basis weight of the downstream filter portion 561 may be greater than the basis weight of the upstream filter portion 551. In addition, the electrostatic filter 50 may be formed by bonding a single frame portion 52 to the outer circumferential surfaces of the upstream filter portion 551 and the downstream filter portion 561, thereby integrating the filter portions 551 and 561.

[0153] Furthermore, in the above embodiment, the term "railway vehicle 900" is not limited to electric trains, but includes Shinkansen trains, monorails, and other vehicles that travel along a track. Also, the vehicle on which the vehicle air conditioning system 800 is installed is not limited to a railway vehicle 900, but may be a bus or other automobile.

[0154] The various aspects of this disclosure are described below.

[0155] (Note 1) A housing having an air intake and exhaust port leading to the passenger compartment, The interior space of the enclosure includes an indoor fan that forms an airflow from the intake port to the exhaust port, In the internal space of the enclosure, an indoor heat exchanger is positioned at a location through which the airflow passes, A statically charged filter for collecting dust contained in the aforementioned airflow, A filter housing section for housing the aforementioned electrostatic filter, An airtight member that seals the space between the filter housing and the electrostatic filter, A machine room maintenance section that allows the internal space to be opened to the outside of the housing, The system includes a filter maintenance section that allows the filter housing to be opened to the outside of the housing, The filter housing is positioned upstream of the indoor heat exchanger in the airflow. The filter maintenance unit is provided in a position where, with the filter housing open, the electrostatic filter, which is housed in the filter housing together with the airtight member, is exposed to the outside of the housing. Vehicle air conditioning system.

[0156] (Note 2) The aforementioned charge filter is It has a filter portion that is charged by friction, and a frame portion that surrounds the outer circumference of the filter portion and is bonded to the filter portion, The aforementioned airtight member is With the electrostatic filter housed in the filter housing, the outer surface of the frame portion facing the filter housing is provided. Vehicle air conditioning system as described in Appendix 1.

[0157] (Note 3) With an additional pre-filter, The pre-filter is positioned upstream of the charging filter in the airflow. The filter maintenance unit allows the electrostatic filter and the pre-filter to be attached to and detached from the filter housing while the filter housing is open. Vehicle air conditioning system as described in Appendix 1 or 2.

[0158] (Note 4) The filter housing section houses at least two or more of the electrostatic filters. The two or more of the aforementioned electrostatic filters each have a different basis weight. A vehicle air conditioning system as described in any one of the appendices 1 to 3. [Explanation of symbols]

[0159] 100...Air conditioner, 110...Outdoor heat exchanger, 120...Indoor heat exchanger, 121...First indoor heat exchanger, 122...Second indoor heat exchanger, 130...Outdoor fan, 140...Indoor fan, 150...Partition wall, 200...Enclosure, 201...Lower wall, 202...Upper wall, 210...Air intake, 211...First air intake, 212...Second air intake, 220...Exhaust port, Fresh air inlet...230, Fresh air outlet...240, 250...Outdoor air intake, 260...Outdoor air outlet, 30...Intake duct, 300...Return port, 301...First return port, 302...Second return port, 31...First intake duct, 32...Second intake duct, 40...Supply duct, 400...Outlet, 50...Electrostatic filter, 51...Filter section, 51a...Filter surface, 51b...Reinforcement member, 51c...Non-woven fabric, 52...Frame section, 52a...First plate, 52b...Second plate, 52c...Third plate, 52d...Fourth plate, 520a, 520b...Outer surface, 53...Airtight member, 54...Pre-filter, 55...Upstream electrostatic filter, 56...Downstream electrostatic filter 501...First charging filter, 502...Second charging filter, 510...First charging filter element, 511...First filter element section, 511a...One side, 512...First frame element section, 520...Second charging filter element, 521...Second filter element section, 521a...One side, 522...Second frame element section, 530...Element fixing section, 551...Upstream filter section, 552...Upstream frame section, 561...Downstream filter section, 562...Downstream frame section, 60...Filter housing Part, 61...Base plate, 61a...Ventilation opening, 62...Filter fixing member, 63...Filter insertion opening, 64...Electrostatic filter housing section, 65...Pre-filter housing section, 66...Slide plate, 601...First filter housing section, 602...Second filter housing section, 621...First guide rail, 621a...First flange, inner surface 621b, 622...Second guide rail, 622a...Second flange, inner surface 622b, 623...First fixing plate, 624...Second fixing plate, 641,642…Filter regulation section, 701…First filter maintenance section, 702…Second filter maintenance section, 800…Vehicle air conditioning system, 900…Railway vehicle (vehicle), CA…Conditioned air, OA…Outside air, PA…Inside air, RF…Roof section, UF…Underfloor section, EX…Exterior, PR…Vehicle compartment, Sa…Indoor unit room (interior space), Sb…Outdoor unit room, Sc…Intake duct space, Sc1…First intake duct space, Sc2…Second intake duct space, Sd…Supply duct space

Claims

1. A housing having an air intake and exhaust port leading to the passenger compartment, The interior space of the enclosure includes an indoor fan that forms an airflow from the intake port to the exhaust port, In the internal space of the enclosure, an indoor heat exchanger is positioned at a location through which the airflow passes, A statically charged filter for collecting dust contained in the aforementioned airflow, A filter housing section for housing the aforementioned electrostatic filter, An airtight member that seals the space between the filter housing and the electrostatic filter, A machine room maintenance section that allows the internal space to be opened to the outside of the housing, The system includes a filter maintenance section that allows the filter housing to be opened to the outside of the housing, The filter housing is positioned upstream of the indoor heat exchanger in the airflow. The filter maintenance unit is provided in a position where, with the filter housing open, the electrostatic filter, which is housed in the filter housing together with the airtight member, is exposed to the outside of the housing. The aforementioned charge filter is The filter part, which has been charged by friction, A frame portion that surrounds the outer periphery of the filter portion and is bonded to the filter portion, It has, A reinforcing member extending in a grid pattern is provided on the filter surface through which the airflow passes in the filter section. The dimension of the filter section in the airflow direction, which is the direction in which the airflow passes through the filter surface, is the same as the dimension of the frame section in the airflow direction. The filter housing section is A base plate having a vent formed through which the aforementioned airflow passes, A filter fixing member for fixing the electrostatic filter to the base plate at the position where the ventilation opening is formed, It has, The filter fixing member is The main body portion extends from the base plate in the direction of airflow passage, A flange extending from the end of the main body that is furthest from the base plate with respect to the airflow direction, in a direction perpendicular to the airflow direction, It has, The flange faces not only the frame portion but also the end of the filter surface in the filter portion in the direction of airflow passage. Vehicle air conditioning system.

2. The filter fixing member is A pair of guide rails, each having the main body and the flange, which are opposed to each other in a direction perpendicular to the airflow direction via the electrostatic filter and extend parallel to each other. It is composed of, The flange of each of the guide rails extends toward the opposing guide rail that is opposite to it. Each of the guide rails has a filter insertion opening at one end in the extending direction for inserting the electrostatic filter between the pair of guide rails. When the filter housing is opened by the filter maintenance unit, the filter insertion opening faces outwards from the housing. The vehicle air conditioning system according to claim 1.

3. The airtight member is With the electrostatic filter housed in the filter housing, the outer surface of the frame portion facing the main body portion of the filter housing is provided. The vehicle air conditioning system according to claim 1 or 2.

4. With an additional pre-filter, The pre-filter is positioned upstream of the charging filter in the airflow. The filter maintenance unit allows the electrostatic filter and the pre-filter to be attached to and detached from the filter housing while the filter housing is open. The vehicle air conditioning system according to claim 1 or 2.

5. The filter housing section houses at least two or more of the electrostatic filters. The two or more of the aforementioned electrostatic filters each have a different basis weight. The vehicle air conditioning system according to claim 1 or 2.

Images