JPH03281998A - Reverse rotation preventing device of rotary compressor - Google Patents

Abstract

PURPOSE:To stop the reverse rotation when a rotary compression element is stopped by using a leaf spring, by providing a reverse rotation preventing member formed of a leaf spring whose one end is fixed to a rotary shaft and whose other end is brought in slidable contact with a lower bearing, in a circular space between the lower end of the rotary shaft and the lower bearing. CONSTITUTION:A rotary compressor has an electromotive element 4 and a rotary compression element 5 in its sealed container 1. The rotary compression element 4 furnishes a cylinder 10 and a roller 12 rotated by the eccentric part 11 of a rotary shaft 3. In this case, a reverse rotation suppressive member 17 is provided, which is formed of a leaf spring 19 provided in a circular space 18 formed between the lower end of the rotary shaft 3 and a lower bearing 4. The leaf spring 19 is formed by fixing its one end to the rotary shaft 3 and bending along the rotating direction from the rotary shaft 3 side to the lower bearing 14. And when the rotary shaft 3 rotates reversely when the compression element 4 is stopped, the reverse rotation is stopped rapidly by acting a force F2 to squeeze the leaf spring to the inner wall of the lower bearing 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement of a rotary compression booklet initial reversal suppressing device.

(B) Conventional technology Conventional rotary compressors have a discharge hole and a suction hole that are connected to each other in the cylinder, and can perform compression by simply providing a discharge valve only in the discharge hole. Since there is no need to provide a suction valve, an increase in suction resistance at the suction hole and an increase in cost can be suppressed (see, for example, Japanese Utility Model Publication No. 63-6471).

(c) Problems to be Solved by the Invention However, since conventional rotary compressors do not have a suction valve in the suction hole, they rotate in reverse due to the difference in high and low pressure when stopped.
If the engine is restarted during reverse rotation, it will continue to rotate and no compression will be performed, and oil will not be supplied to the sliding parts, causing a problem of burnout in the sliding parts.

This invention solves the above problem, and provides a rotary compressor that promptly suppresses reverse rotation when the rotary compressor is stopped, and prevents the rotary compressor from rotating in reverse even when restarted immediately after stopping. The purpose is to

(d) Means for Solving the Problems This invention comprises a closed container having an oil tank in which oil is stored at the bottom, an electric element housed in the upper side of the container, and the electric element housed in the lower side. A rotary compression element driven by a rotating shaft of the cylinder, a roller that rotates in the cylinder by an eccentric part of the rotating shaft, and an upper bearing part and a lower bearing part that close the opening of the cylinder. In the rotary compressor configured, an annular space immersed in oil is provided between the lower end of the rotating shaft and the lower bearing part,
A reversal suppressing member formed of a leaf spring having one end fixed to the rotating shaft and the other end slidingly contacting the lower bearing portion is provided within this space.

(e) Effect This invention is configured as described above, so that one end is fixed to the rotating shaft in the annular space formed between the lower end of the rotating shaft and the lower bearing, and the other end is slidably connected to the lower bearing. A reversal suppressing member made of a flat leaf spring is provided, and this reversing suppressing member is immersed in oil to prevent the reversing suppressing member from becoming a resistance during forward rotation that performs a compression action, and to prevent this reverse rotation suppressing member during reverse rotation. The member acts as a resistance, so that when the roller inside the cylinder rotates in reverse due to the difference in high and low pressures when the cylinder is stopped, the reverse rotation is quickly stopped.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container having an oil reservoir 2 in which oil is stored at the bottom. Inside this container, there is an electric element 4 having a rotating shaft 3 on the upper side, and a rotary compression element 5 driven by the electric element on the upper side. It is stored. The electric element 3 is composed of a stator 6 and a rotor 7. Stator 6 is stator core 8
and a single-phase winding 9 wound around this iron core.

The rotary compression element 4 includes a cylinder 10 and an eccentric portion 1 of the rotating shaft 3.
1, a roller 12 rotates inside the cylinder 10, and an upper bearing part 13 and a lower bearing part 1 that close the opening of the cylinder 10.
4, and a cup muffler 15 fitted to this upper bearing part. An oil supply hole 16 is provided in the center of the rotating shaft 3 in the axial direction.

Reference numeral 17 denotes a reverse rotation suppressing member, and this member is formed of a leaf spring 19 provided in an annular space 1B formed between the lower end of the rotating shaft 3 and the lower bearing portion 14. One end of this leaf spring is fixed to the rotating shaft 3, and the other end is provided so as to be in sliding contact with the lower bearing portion 14. The leaf spring 19 is curved from the rotating shaft 3 side toward the lower bearing portion 14 along the rotational direction.

In the reversal suppressing device for a rotary compressor configured as described above, the refrigerant that has flowed into the cylinder 10 is compressed by the rotation of the roller 12 and completely discharged into the cup muffler 15.

Oil in the oil reservoir 2 is supplied to each sliding portion through an oil supply hole 16 of the rotating shaft 3.

When the rotating shaft 3 rotates in the forward direction, the reverse rotation suppressing member 17 applies a force F in the direction of separating the leaf spring 19 from the inner wall of the lower bearing portion 14, so that the sliding resistance during forward rotation does not increase. There is. Further, when the rotating shaft 3 rotates in the reverse direction, a force F that presses the leaf spring 19 against the inner wall of the lower bearing part 14 acts on the reverse rotation suppressing member 17, so that the sliding resistance increases during the reverse rotation. Therefore, even if the rotary compression element 5 rotates in the opposite direction due to the pressure difference between the high pressure side and the low pressure side when stopped, it is immediately stopped, and it is possible to prevent it from rotating in the reverse direction when restarting immediately after stopping. .

The leaf spring 19 has one end fixed to the lower end of the rotating shaft 3, and the other end is curved in the forward rotation direction of the rotating shaft 3 and slides into contact with the inner wall of the lower bearing part 14, so that the rotating shaft 3 rotates in the normal direction. When the rotating shaft 3
is rotating in the opposite direction, the oil in the annular space 18 causes F
, and is pressed against the inner wall of the lower bearing portion 14.

In addition, when the rotary compression element 5 rotates in the reverse direction, the temperature of the reverse rotation suppressing member 17 increases due to an increase in the current flowing through the winding 9 of the electric element 4 due to an increase in sliding resistance, and the electric element 4 is overloaded due to a normal overload. It is possible to force a stop.

This invention provides a reverse rotation suppressing member 17 formed by a leaf spring 19 in an annular space 18 formed between the lower end of the rotating shaft 3 and the lower bearing part 14, and in the forward rotation direction in which compression is performed within the cylinder 10. At this time, the reversal suppressing member 17 prevents the sliding resistance of the rotating shaft 3 from increasing, and when the rotating shaft 3 rotates in the reverse direction due to the difference in high and low pressures when stopped, the reversing suppressing member 17 prevents the sliding resistance of the rotating shaft 3 from increasing. The resistance is increased to quickly stop the reverse rotation of the rotating shaft 3.

(g) Effects of the Invention According to the present invention, an annular space is provided between the lower end of the rotating shaft and the lower bearing part, one end is fixed to the rotating shaft within this space, and the other end is fixed to the lower bearing part. Since a reverse rotation suppressing member formed of a leaf spring that is in sliding contact with the bearing portion is provided, even if reverse rotation occurs when the rotary compression element is stopped, the plate spring of the reverse rotation suppressing member quickly stops the reverse rotation. It is possible,
This prevents the reverse rotation from continuing when restarting immediately after stopping. In addition, the reverse rotation suppressing member can reduce the sliding resistance during forward rotation of the rotating shaft, thereby preventing an increase in input during operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a rotary compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... Airtight container, 2... Oil reservoir, 3...
Rotating shaft, 4... Electric element, 5... Rotating compression element, 10... Cylinder, 11... Eccentric part,
12... Roller, 17... Reverse rotation suppressing member,
18... Annular space, 19... Leaf spring.

Claims (1)

[Claims] 1. A closed container having an oil reservoir at the bottom, an electric element housed in the upper side of the container, and a rotary compression element housed in the lower side and driven by the rotating shaft of the electric element. In a rotary compressor, the rotary compression element is composed of a cylinder, a roller that rotates in the cylinder by an eccentric part of the rotary shaft, and an upper bearing part and a lower bearing part that seal the opening of the cylinder. An annular space immersed in oil is provided between the and the lower bearing part, and a reverse rotation suppressor is formed within this space by a leaf spring whose one end is fixed to the rotating shaft and the other end is in sliding contact with the lower bearing part. A reversal suppressing device for a rotary compressor, characterized in that a member is provided.