Abstract:
An electric compressor comprising a casing in which a compressing mechanism 4, an electric motor portion for driving the compressing mechanism 4, and an inverter portion 8 for driving the electric motor portion are incorporated, wherein a surface of the casing is provided with a collided portion 3d, the collided portion 3d is provided only on a portion of the casing other than a portion thereof in which the electric motor portion is incorporated and a portion of the casing other than a portion thereof in which the inverter portion 8 is incorporated. According to this, it is possible to provide the electric compressor 1 capable of preventing a high voltage portion from being exposed to an impact load applied to the electric compressor 1 when a vehicle collides without increasing a weight, an external size and a cost of the electric compressor 1.
Abstract:
A scroll pump has a tip seal between an axial end of the scroll blade of one of stationary and orbiting plate scrolls of the pump and the plate of the other of the stationary plate and orbiting plate scrolls. The scroll pump may have a ballast gas supply system and use the operation of the ballast gas supply system to assess the condition of the tip seal. Alternatively, the scroll pump may have two pressure sensors that sense pressure at two locations spaced along a compression mechanism of the pump to assess the condition of the tip seal.
Abstract:
The present invention relates to a vacuum pumping system (10) which comprises: a vacuum pumping mechanism (12) and a motor (14) for driving the vacuum pumping mechanism. Means (16) are provided for determining a cumulative load on the vacuum pumping system over time by monitoring a characteristic of the motor over that time. Means (18) are also provided for activating a maintenance activity on the system when the cumulative load exceeds a predetermined amount.
Abstract:
An electric vacuum pump actuating module for boosting the braking force of a motor vehicle, including a main controller and a driver circuit for operating the electric vacuum pump. The driver circuit includes a first and a second switch. The first switch switches a supply voltage above a predefined voltage level of an operating voltage of the vacuum pump. The second switch switches a supply voltage below the voltage level of the vacuum pump. The main controller controls the first switch by first control signals and the second switch by second control signals. The actuating module determines a state of the electric vacuum pump as a first piece of information based on a first response of the electric vacuum pump resulting from the first or second control signals. The actuating module assesses the state of the electric vacuum pump as error-free or erroneous operation of the electric vacuum pump.
Abstract:
A pumping system includes a pumping mechanism, a motor for driving the pumping mechanism, a device for supplying power of a variable frequency to the motor, a control device for setting a maximum value for a current in the motor, and a device for supplying to the control device data indicative of the temperature of gas exhaust from the pumping mechanism and a temperature of the stator of the pumping mechanism, wherein the control device is configured to use the received data to adjust the maximum value during operation of the pumping system.
Abstract:
Techniques are provided for protecting a rotary positive displacement pump. The techniques include apparatus featuring a signal processor configured to receive signaling containing information about power, torque, speed, viscosity and specific gravity related to the operation of a pump; and determine whether to enter an enhanced pump protection mode for the rotary positive displacement pump based at least partly on a relationship between an actual corrected tune ratio and a tuned ratio set point (Tune Ratio SP). The signal processor may determine if the actual corrected tune ratio is less than or equal to the actual corrected tune ratio set point (Tune Ratio SP), and if so, then to enter the enhanced pump protection mode, else to continue to use a basic pump protection mode, and may also determine the actual corrected tune ratio based at least partly on a ratio of an actual corrected power (PAcorr) divided by a tuned corrected power (PTcorr) at a specific operating speed
Abstract:
The scroll refrigeration compressor includes a sealed casing, stationary and moving volutes including spiral wraps engaged in one another and defining the variable-volume compression chambers, a delivery chamber defined by the plate of the stationary volute and the sealed casing, a heat shield disposed in the delivery chamber and dividing the delivery chamber into a first volume defined by the plate of the stationary volute and the heat shield and a second volume defined by the heat shield and the sealed casing, and at least one flow passage arranged to communicate the first and second volumes. The compressor further includes at least one bypass passage arranged to communicate the first volume with an intermediate compression chamber, and at least one bypass valve disposed in the first volume and movable between closing and opening positions for closing and opening the corresponding bypass passage.
Abstract:
Systems and methods for detecting a blocked air discharge line of an air compressor are described, which include monitoring motor current (IMTR) drawn by a compressor motor, and calculating a three-point moving average for a steady state current drawn by the compressor motor upon the motor reaching steady state (nominal) operating speed. After expiration of a predetermined time period T1 that commences upon the compressor motor reaching steady state speed, a determination is made regarding whether a difference between a current drawn by the compressor motor and the three-point moving average has exceeded a predetermined current value I2 and is consistent with a current profile indicative of a blocked air line. If a blocked air line is detected, a compressor shut-off command is generated and transmitted to the compressor motor to shut the compressor motor off prior to opening of a safety valve on the compressor.
Abstract:
A compressor includes a casing accommodating a refrigerant passageway, a compression mechanism and a pipe. The compression mechanism is disposed in the interior of the casing to discharge compressed refrigerant into the refrigerant passageway. The pipe extends from inside of the casing to outside of the casing. The pipe includes two ends. One end is a closed end disposed in a predetermined position inside the refrigerant passageway. The other end of the pipe is an opened end disposed outside the casing. The pipe is preferably sized so that a measuring instrument can be inserted into the pipe through the opened end.
Abstract:
An object is to provide a hermetic electric compressor that can simplify the installation structure of an internal protector and improve the ease-of-assembly thereof.In a hermetic electric compressor having a compressor and an electric motor (10) built into a sealed housing (2), the electric motor (10) includes a stator (8) to which plastic insulating bobbins (30) having flanges (30B, 30C) on an inner and outer circumferences of a plurality of tooth parts of a stator core are fitted and around which a stator winding wire (8A) is wound in concentrated winding around the plastic insulating bobbins (30), and an internal protector (29) for electric-motor protection is latched between the inner and outer circumferential flanges (30B, 30C) of the plastic insulating bobbins (30) by being urged against the stator winding wire (8A).