Abstract: Assembly workability of an electric compressor to which an inverter circuit section and a filter circuit section are attached is improved. The inverter circuit section (3) includes an inverter control board (17), a sleeve assembly (18), and a power module (14). The inverter control board, the sleeve assembly, and the power module are integrated. The filter circuit section (4) includes a filter circuit board (66) and a support member (67). The filter circuit board (66) and the support member (67) are integrated. The inverter circuit section and the filter circuit section are structured to be capable of being stored each individually within an inverter storing section (8) from the same direction and detachably attached to the housing (2).

Abstract: The physical quantity measurement device includes a secondary flow path disposed outside a multilayer unit and configured to connect an upstream opening to a downstream opening. The secondary flow path is disposed gravitationally below a primary flow path. Ultrasonic transceivers are disposed to project into a flow in the multilayer unit. In the thus-configured physical quantity measurement device, the entry of water droplets into an ultrasonic propagation path and the adhesion of water droplets to the ultrasonic transceivers are substantially prevented, so that, even when the fluid flowing in contains water droplets, the physical quantity measurement device can measure the flow rate of the fluid and the concentration of components contained in the fluid.

Abstract: An inverter device is provided which is capable of more quickly raising an internal temperature of an electrolytic capacitor within a permissible range of a ripple voltage to shorten a non-operating time. The inverter device includes an electrolytic capacitor, an inverter circuit, a temperature sensor, and a control device. When the ambient temperature of the electrolytic capacitor detected by the temperature sensor is lower than a predetermined temperature, the control device on-drives specific switching elements of the inverter circuit before the start of a normal operation of a motor, and executes a warming up operation of allowing a current capable of controlling a ripple voltage of a DC voltage within a permissible range to flow through the motor at a predetermined rate of increase while keeping the motor stopped.

Abstract: A physical quantity measurement device is provided which is capable of measuring a component in a fluid to be measured even when the fluid contains droplets such as fine water droplets. The physical quantity measurement device includes, at an inlet opening (5) of a sub-channel (7), an inflow direction regulator (13) which includes guide pieces (12) each of which is inclined at predetermined angle ? with respect to the flow direction in a main channel (1). The angle ? of inflow direction regulator (13) is set to a value that is greater than 90 degrees in relation to the flow direction of the main channel (1).

Abstract: [Problem] An inverter device is provided which is capable of more quickly raising an internal temperature of an electrolytic capacitor within a permissible range of a ripple voltage to shorten a non-operating time. [Solution] The inverter device includes an electrolytic capacitor 1, an inverter circuit 2, a temperature sensor 4, and a control device 3. When the ambient temperature of the electrolytic capacitor 1 detected by the temperature sensor 4 is lower than a predetermined temperature, the control device 3 on-drives specific switching elements of the inverter circuit 2 before the start of a normal operation of a motor 5, and executes a warming up operation of allowing a current capable of controlling a ripple voltage of a DC voltage within a permissible range to flow through the motor 5 at a predetermined rate of increase while keeping the motor 5 stopped.

Abstract: An ultrasonic flowmeter includes: a flow path body having a flow path through which a fluid to be measured flows; a pair of ultrasonic transducers disposed in the flow path body; a substrate fixed to the flow path body; a sensor plate on which a temperature sensor for detecting a temperature of the fluid to be measured is disposed, the sensor plate being flat; and an arithmetic unit that calculates a flow rate of the fluid to be measured from a propagation time of ultrasonic waves between the pair of ultrasonic transducers and the temperature detected by the temperature sensor. The sensor plate is configured to project from the substrate and to project into a flow path cross-section of the flow path from a sensor hole provided in the flow path body at a time of fixing the substrate to the flow path body.

Abstract: Assembly workability of an electric compressor to which an inverter circuit section and a filter circuit section are attached is improved. The inverter circuit section (3) includes an inverter control board (17), a sleeve assembly (18), and a power module (14). The inverter control board, the sleeve assembly, and the power module are integrated. The filter circuit section (4) includes a filter circuit board (66) and a support member (67). The filter circuit board (66) and the support member (67) are integrated. The inverter circuit section and the filter circuit section are structured to be capable of being stored each individually within an inverter storing section (8) from the same direction and detachably attached to the housing (2).