公开(公告)号：US20240317015A1

公开(公告)日：2024-09-26

申请号：US18578034

申请日：2022-06-28

Applicant: Hitachi, Ltd.

Inventor： Akeshi TAKAHASHI ,  Hiroyuki TOYODA ,  Masaki KOYAMA ,  Yuji ENOMOTO ,  Kinya NAKATSU

IPC: B60H1/00 ,  B60H1/14

CPC classification number: B60H1/00392 ,  B60H1/00321 ,  B60H1/00485 ,  B60H1/143

Abstract: The purpose of the present invention is to provide a low-cost heat cycle system that can reduce power consumption; an in-wheel motor that is driven by using this heat cycle system; and a vehicle in which this heat cycle system is installed. This heat cycle system is provided with: a compressor; an accumulator; an electric drive unit comprising an electric motor; a refrigerant compressed by the compressor; and an indoor heat exchanger and an outdoor heat exchanger responsible for heat exchange of the refrigerant. The heat cycle system comprises a four-way valve that comprises a single circulation path for circulating the refrigerant and that can switch the connection destination of a refrigerant discharge section of the compressor to the indoor heat exchanger or the outdoor heat exchanger. A cooling unit of the electric drive unit is arranged upstream of the accumulator in the flow of the refrigerant.

公开(公告)号：US20240240817A1

公开(公告)日：2024-07-18

申请号：US18015641

申请日：2021-11-10

Applicant: Hitachi, Ltd.

Inventor： Hiroyuki TOYODA ,  Daisuke AKIMARU ,  Akinori KAWASAKI ,  Tomoaki TAGUCHI

IPC: F24F8/22

CPC classification number: F24F8/22

Abstract: There is provided an air sterilization apparatus that is excellent in applicability to a rectangular duct and can effectively irradiate dust, bacteria, viruses, and the like in circulating air with ultraviolet light while preventing an increase in blowing resistance. The air sterilization apparatus includes a rectangular frame, an ultraviolet light emitting unit, and first reflecting surfaces. The frame includes a pair of first opposite side portions spaced apart from each other in a first direction and extending along a second direction, and a pair of second opposite side portions spaced apart from each other in the second direction and extending along the first direction. A ventilation space is defined inside the frame. The ventilation space allows air to flow therethrough along a third direction substantially orthogonal to the first direction and the second direction. The ultraviolet light emitting unit is provided on at least one of the pair of first opposite side portions, and emits ultraviolet light toward the ventilation space. The first reflecting surfaces are respectively provided on the pair of first opposite side portions so as to face each other. Each first reflecting surface is concave such that a center thereof in the third direction bulges to the outside of the ventilation space. The first reflecting surfaces reflect the ultraviolet light. A length of the ventilation space in the third direction is shorter than a length of the ventilation space in the first direction and a length of the ventilation space in the second direction, and a shape of each first reflecting surface in any cross section perpendicular to the second direction is defined based on an arc having a radius of curvature equal to or larger than a distance between the pair of first reflecting surfaces.

公开(公告)号：US20240219049A1

公开(公告)日：2024-07-04

申请号：US17920086

申请日：2021-04-21

Applicant: Hitachi, Ltd.

Inventor： Hiroyuki TOYODA ,  Hiroshi MAITA ,  Shoichi TAGUCHI ,  Daisuke AKIMARU ,  Akinori KAWASAKI

IPC: F24F8/22 ,  A61L9/20

CPC classification number: F24F8/22 ,  A61L9/20

Abstract: Provided is an air sterilizer capable of efficiently irradiating dust, bacteria, viruses, and the like in circulating air with ultraviolet rays while preventing an increase in a blowing resistance, and an air conditioning apparatus using the air sterilizer.
An air sterilizer includes a frame of which air passes through an inside; an ultraviolet ray light source configured to emit ultraviolet light having a predetermined divergence angle; and a mirror surface configured to reflect the ultraviolet light and emit the ultraviolet light toward the air passing through the inside of the frame. A thickness of the frame in a direction in which the air passes is smaller than a diameter of a circle tangent to an inner circumference of the frame. When the ultraviolet light emitted from the ultraviolet ray light source is reflected by the mirror surface, the reflected light has a divergence angle or a convergence angle smaller than the divergence angle at least in a thickness direction of the frame.

公开(公告)号：US20240010051A1

公开(公告)日：2024-01-11

申请号：US17921370

申请日：2021-06-24

Applicant: HITACHI, LTD.

Inventor： Hiroshi MAITA ,  Hiroyuki TOYODA ,  Daisuke AKIMARU ,  Akinori KAWASAKI ,  Tomoaki TAGUCHI ,  Fumio FUJII

IPC: B60H3/00 ,  B61D27/00

CPC classification number: B60H3/0092 ,  B61D27/0072

Abstract: An object of the present invention is to provide an air conditioner for a rail vehicle that is excellent in cleanliness and comfort by cleaning the air conditioner at an appropriate timing without causing discomfort to passengers. An air conditioner for a rail vehicle including a vehicle control system includes: a refrigeration cycle device 3 that can execute a cleaning operation; and an air conditioning control device 4 that controls the refrigeration cycle device, and the air conditioning control device 4 can communicate with the vehicle control system 2 and causes the refrigeration cycle device 3 to execute a cleaning operation on the basis of status information obtained from the vehicle control system 2.

公开(公告)号：US20230150553A1

公开(公告)日：2023-05-18

申请号：US17640496

申请日：2021-01-22

Applicant: HITACHI, LTD.

Inventor： Hiroshi MAITA ,  Hiroyuki TOYODA ,  Shoichi TAGUCHI ,  Akinori KAWASAKI ,  Tomoaki TAGUCHI ,  Daisuke AKIMARU

IPC: B61D27/00

CPC classification number: B61D27/0018

Abstract: Provided is an air conditioning system for a railway vehicle that is of a roof installation type. The air conditioning system includes a heat exchanger through which at least air inside the railway vehicle passes, and an ultraviolet-ray irradiation device. The heat exchanger and the ultraviolet-ray irradiation device are arranged between an upper cover curved in an upwardly protruding shape and a bottom plate. The heat exchanger has an air suction surface arranged so as to be irradiated with ultraviolet rays generated by the ultraviolet-ray irradiation device. A member that does not transmit the ultraviolet rays is arranged on a straight line interconnecting the ultraviolet-ray irradiation device and an interior space of the railway vehicle.