JPS5893972A - Motor compressor - Google Patents

Abstract

PURPOSE:To equalize compression load by forming the cam surface which moves a compression piston reciprocatingly so that an angular range between the bottom dead center and the top dead center, which corresponds to the compression cycle, is made larger than 180 deg. CONSTITUTION:At one end of a piston 7 which is adapted to reciprocate in a cylinder 6, there is provided a roller pin 9 provided with a roller 8 which engages with a cam surface 5 formed on a cam shaft 4. The cam shaft 4 rotates when a motor 2 is energized so that the piston 7 reciprocates by means of the roller 8 engaged with the cam surface 5. Since the angular range of the cam surface 5 between the bottom dead center and the top dead center, which corresponds to the compression cycle of the piston, is made larger than 180 deg., such as for example, 210 deg., the required torque is aimed at being reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric compressor in which a piston of the compressor is actuated by a cam, and by setting an appropriate operating curve of the cam,
The purpose is to suppress compressor load fluctuations and improve efficiency.

In the case of a conventional compressor of the reciprocating type, the motion of the piston is limited to a sine wave motion, which is a limitation in equalizing the compression load.

The present invention solves the two-part conventional restriction by setting the top dead center of the cam that reciprocates the piston with the cam to be at a position exceeding 180 degrees from the bottom dead center, that is, by setting the compression stroke to be long. It is.

In the figure, 1 is a casing, and 2 is a motor stator press-fitted into the casing. 3 is bearing metal,
A camshaft 4 press-fitted into the morph rotor 2a is held. Further, 5 is a cam surface formed on the camshaft 4. In this case, the top dead center of the cam curve 5a of the cam surface 5 is 180 degrees from the bottom dead center.
It is set in an extreme position. A cylinder 6 is fixed to the bearing metal 3 and has an axis parallel to the axis of the camshaft 4, and a piston 7 is slidably disposed within the cylinder. One end of the piston 7 is provided with a roller pin 9 having a roller 8 at its tip (lower end), and the roller 8 engages with the cam surface 5. Further, one end of the roller pin 9 (upper end) extends into a guide 10 provided in a part of the cylinder 6. 11 is a pulp plate, and 12 is a cylinder head. 13 is a suction pipe provided at the end of the casing 1, 14 is a discharge pipe, and 15 is a discharge chamber. 16 is oil stored at the bottom of casing 1, 17
18 is an oil fan fixed to the camshaft 4, and 18 is an oil baffle fixed to the discharge chamber 15.

As shown in the developed view of FIG. 2, the cam curve 6a of the cam surface 6 corresponds to the compression stroke (from the bottom dead center to the bottom dead center) of the piston 7, and extends over a rotation angle of 0° to 2100°. It is larger than the rotation angle of the compression process compared to 00 to 1800 for general piston/connecting rod types.

The rotation angle of the single suction stroke is from 210° to 3600°. Note that the stroke change states of the compression stroke and the suction stroke are each approximated sinusoidal curves.

In the above configuration, when the cam surface 6 is rotated by energizing the motor 2, the piston 7 slides back and forth within the cylinder 6 along the cam curve 5a due to the roller 8 and roller pin 9 engaged with the cam surface 6.

At the same time, the oil fan 17 also rotates, and the oil baffle 1
8 and oil 16 is supplied to the fitting sliding portion in the gauging 1. During this time, the air flows into the cylinder 6 through the actuating pipe 13 of the piston 7, is compressed, and is discharged out of the casing 1 through the discharge pipe 14.

Therefore, by setting the top dead center position of the cam curve 5a formed on the cam 4 to a position exceeding 180 degrees from the bottom dead center,
The rotation angle of the compression process, which has a large load compared to the suction process, can be made larger than that of conventional products, so it is possible to reduce the required torque, lower the electric motor input, and achieve high performance efficiency.

As is clear from the above description, the electric compressor of the present invention is
Since the top dead center position of the piston actuating cam is set to a position more than 180 degrees from the bottom dead center, it is possible to reduce the torque during the compression process, lowering the motor input and improving the power consumption efficiency. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the electric compressor of the present invention, and FIG. 2 is a developed view of a cam curve 5a on the cam surface 4 of FIG. 2, , , , Motor stator, 4 , , , Camshaft, 500011. Cam surface, 2 a, , e Motor rotor, 6, , . 3. Cylinder, 7,,,,,,piston. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 0'/lO'31; θ.

Claims (1)

[Claims] A compression element such as a piston or a cylinder, an electric element such as a motor rotor or a motor stator that drives the compression element, and a cam surface that reciprocates the piston, the lower end of the cam surface corresponding to the compression process of the piston. An electric compressor in which the two-dimensional point position is set at a rotation angle greater than 180 degrees.