Abstract:
In a compressor shell built in an outdoor unit 10 of an air conditioner, a compressor shell thermistor 21 that detects a temperature of the shell is installed. Also, an outside air temperature thermistor 22 that detects an outside air temperature is installed in an outdoor unit. The outside air temperature is compared with the compressor shell temperature, and if the shell temperature is higher than the outside air temperature, a compressor heating device is invalidated. If the shell temperature is lower than the outside air temperature, it is determined as a refrigerant collection condition, and the compressor heating device is operated. Also, if the shell temperature is higher than the outside air temperature by a certain temperature or more, the operation of the compressor heating device is stopped so that wasteful standby power is reduced, and energy of the apparatus is saved.
Abstract:
The invention relates to a high-pressure fuel pump (5) for an injection system of a combustion engine, having a pump housing (16), and a pump piston (14) which is guided in a pump cylinder and can be moved up and down by translation, wherein a temperature sensor (22) is provided for determining the temperature of the fuel conveyed by the high-pressure fuel pump (5). According to the invention, a high-pressure fuel pump (5) having increased robustness is provided. This is achieved by arranging the temperature sensor (22) in the area of the high-pressure fuel pump (5). In particular, the pump piston (14) is moved by a plunger (17) which is guided in a receptacle (13) and delimits an upper plunger space (20) in said receptacle, and the temperature sensor (22) is arranged in the area of the upper plunger space (20) or of a connecting line (21) between two upper plunger spaces (20). The temperature detected by the temperature sensor (22) is preferably used for controlling a low pressure pump (2) and thus for regulating the cooling of the high-pressure fuel pump (5).
Abstract:
There is provided an electric compressor that can protect a component to be protected from heat damage according to a capability of the component. The electric compressor 10 includes a compression mechanism 11, an electric motor 12 that drives the compression mechanism 11, and a control portion 13 that controls to drive the electric motor 12, incorporated into a single casing, and further includes a temperature detector 14 that detects a temperature of one or more components that constitute one or both of the control portion 13 and the electric motor 12, and a current detector 15 that detects a current flowing through the component. When the temperature detected by the temperature detector 14 is a temperature Td, the current detected by the current detector 15 when the temperature detector 14 detects the temperature Td is a current Id, and a current corresponding to the temperature Td at a temperature characteristic relating to the current specific to the component is a current Ia(Td), the control portion 13 stops driving the electric motor 12 on the basis of a result of comparison between Ia(Td) and Id.
Abstract:
The invention relates to a method for controlling a compressor of a refrigeration system, said compressor having a motor, wherein the temperature of the cooling point is controlled by means of switch-on and switch-off operation of the motor if the temperature in the compressor exceeds an upper temperature threshold and the temperature of the cooling point is controlled by means of continuously switched-on operation of the motor as soon as the motor has cooled down to a lower temperature threshold, wherein the control system converts a manipulated variable corresponding to the cooling demand of the cooling point into a switching signal for a valve, which switching signal causes clocked opening and closing of the valve, or a frequency converter controls the refrigerant flow through the compressor by controlling the voltage and the frequency of the motor, in that the frequency converter converts a manipulated variable corresponding to the cooling demand of a cooling point into a voltage and a frequency for the motor.
Abstract:
Dispositif de chauffage (22) pour le carter d'huile (24) d'un compresseur (26) comportant: des moyens de chauffage (28) électriques; des moyens de connexion (72) agencés pour connecter les moyens de chauffage (28) à une source d'énergie électrique; et des moyens de fixation (32) des moyens de chauffage (28) autour du carter d'huile (24). Les moyens de connexion comprennent un thermostat fixé aux moyens de fixation (32) des moyens de chauffage (28) à distance de ces derniers, destiné à être placé au niveau de la surface extérieure du carter d'huile (24), et conçu pour se déformer mécaniquement de manière à: déconnecter électriquement la source et les moyens de chauffage (28), lorsqu'il mesure une température supérieure à une valeur déterminée; et connecter électriquement la source et les moyens de chauffage lorsqu'il mesure une température inférieure à la valeur déterminée.
Abstract:
A compressor is provided with: a motor (30); a piston rod (11) which is driven by the motor (30) and reciprocatable within a cylinder (10); a seal member (14) adapted to seal between the piston rod (11) and the cylinder (10); a cold state determining unit (110) adapted to determine whether the compressor is in a cold state or not; and a rotating speed control unit (120) adapted to control a rotating speed of the motor (30) to increase so that a warm-up operation is executed when the cold state determining unit (110) determines that the compressor is in the cold state.