JP4403046B2 - Linear vibratory compressor - Google Patents

Description

  The present invention relates to a linear vibration type compressor in which a piston is electromagnetically reciprocated in a cylinder.

  For example, the tip of a connecting rod whose base end is pivotally supported by the crankshaft is pivotally supported by a piston fitted in the cylinder, and the piston is reciprocated as the crankshaft rotates to compress the gas. In the mechanical piston reciprocating compressor, the reciprocating sliding range of the piston is always correctly and constantly regulated by the crankshaft and the connecting rod.

However, in a linear vibration type compressor that reciprocates the piston linearly using electromagnetic action, the movement of the piston is not mechanically constrained, and its range of motion varies with changes in load and current. It depends on.
For this reason, the piston may collide with the inner surface of the end wall of the cylinder due to the load, posture, or operating conditions, etc., generating vibration and noise, or even damaging the piston and the valve attached to it. There is also.

  Although such inconvenience can be prevented by electrical control, a controller is required for this purpose, and a space for installation is required and the cost is increased.

  For this reason, conventionally, an annular packing-like buffer is provided at a position where the end wall of the cylinder and the outer surface of the piston may come into contact with each other, and the end surface of the piston collides with this to cushion the impact. (For example, Patent Documents 1 and 2).

However, in this case, the buffering range of the piston is limited to the thickness of the buffering body, that is, the stroke until it is fully compressed, and the buffering force is limited to the range of the force required to press and deform the buffering body. In addition, after compressing the buffer, the repulsive force rapidly increases, so the operation becomes unsmooth, and the actual situation is not necessarily fulfilling the purpose.
JP, 10-131856, A cushioning material (14) of Drawing 3 JP, 2003-227465, A Damping part material (42) of Drawing 2

  In the linear vibration type compressor in which the stroke of the piston is not mechanically regulated, the kinetic energy is gradually reduced without the piston striking the end face of the cylinder at the end of the forward stroke. In addition, it absorbs in stages and allows it to smoothly return to the stroke, so as to alleviate the impact, prevent the generation of noise, and apply an unreasonable load to each part over a long period of time. An object of the present invention is to obtain a linear vibratory compressor that can operate smoothly.

According to the present invention, the above problem is solved as follows.
(1) A piston attached to a drive shaft capable of electromagnetically vibrating linearly is fitted into the cylinder, and the end face of the piston moves closer to and away from the end wall of the cylinder as the drive shaft reciprocates. In the linear vibration type compressor that sucks and pressurizes the gas, an inverted V-shape facing the axial direction is provided on the inner surface of the end wall of the cylinder, on the inner periphery of the annular support piece made of a flexible material. When the buffer packing formed by connecting annular protrusions having a cross-section is fixed and the outer end surface of the piston abuts against the buffer packing, the annular protrusion is pressed to absorb the impact, and the outer end surface of the piston and the annular protrusion are The air in the space surrounded by the end wall of the cylinder is compressed to absorb the impact, and the annular protrusion is pressed, and the air in the annular space surrounded by the annular protrusion and the end wall of the cylinder is compressed. By compressing the impact So as to yield.

(2) In the above item (1), the inner periphery of the annular projection, is positioned on the outer surface and the same surface of the annular holding support piece.

(3) In the above item (1), the inner peripheral edge of the annular protrusion is floated inward from the outer surface of the annular sandwich piece.

(4) A piston attached to a drive shaft that can electromagnetically vibrate linearly is fitted into the cylinder, and the end surface of the piston moves closer to and away from the end wall of the cylinder as the drive shaft reciprocates. In the linear vibration type compressor that sucks and pressurizes the gas, on the inner surface of the end wall of the cylinder, on the inner periphery of the annular support piece made of a flexible material, a pipe-shaped cross section facing the axial direction When the outer end surface of the piston comes into contact with the buffer packing, the annular projection is pushed to absorb the impact, and the outer end surface of the piston, the annular projection, and the cylinder The air in the space surrounded by the end wall is compressed to absorb the impact.

The invention according to claim 1 is as follows:-When the outer end surface of the piston first comes into contact with the annular protrusion of the shock absorbing packing and is pressed, energy is primarily absorbed by deforming the annular protrusion.
When the piston further advances, the air in the disk-shaped space surrounded by the outer end surface of the piston, the annular protrusion, and the end wall of the cylinder is compressed, and energy is absorbed secondarily.
When the piston further advances, the annular protrusion is pressed, the air in the sealed annular space between the annular protrusion and the end wall of the cylinder is compressed, and the impact caused by the collision of the piston is thirdarily absorbed and relaxed.

  Invention of Claim 2:-The compression of the air in the space surrounded by the annular projection starts almost simultaneously with the end face of the piston pushing the tip of the annular projection, and the impact of the piston is quickly absorbed.

  Invention of Claim 3:-When the kinetic energy of a piston is small, the end surface will lightly contact | abut to the front-end | tip of an annular protrusion, energy will be absorbed lightly as it is, and if an annular protrusion is contact | abutted strongly, an annular protrusion will be The air in the space surrounded by the inner side of the cylinder and the end face of the piston and the end wall of the cylinder is also compressed, and a large amount of energy is absorbed.

    Invention of Claim 4: The same effect as that of the invention of claim 1 is exhibited, but the absorption of energy when the end surface of the piston pushes the tubular projection is larger.

  As shown in FIGS. 1 and 2, the left and right end walls (2) and (2) of the housing (1) having a rectangular tube shape are respectively connected to the cylinder (4) via a buffer packing (3). (4) is provided on the same axis.

  Magnetic yokes (7) and (7) with a horizontal coil (6) are fitted into the fitting holes (5) and (5) provided in the center portions in the axial direction of the upper and lower surfaces of the housing (1). They are fixed together. An inwardly arcuate permanent magnet (8) is fixed to the inner peripheral surface of each yoke (7).

  The central portions of the pistons 9 and 9 fitted to the cylinders 4 and 4 are connected to each other by a drive shaft 10, and the permanent magnet is connected to the central portion of the drive shaft 10. The movable iron core (11) located at the center of (8) is fixed.

  Each cylinder (4) is provided with a discharge hole (13) with a plate valve (12) that opens only to the outside.

  Each piston (9) has a suction hole (15) (15) with a plate valve (14) that opens only to the outside.

  The inner end of each cylinder (4) is hermetically fixed to an inward flange (16) projecting from the inner surface of the housing (1).

  On the inner and outer sides in the axial direction of the inward flange (16), the housing (1) has an inlet hole (17) and an outlet hole (18), respectively.

  In the present invention, the buffer packing (3) is characterized as follows, unlike the conventional simple flat packing.

  The buffer packing (3) is made of a flexible material such as rubber or plastic, and has an axial line on the inner periphery of the annular clamping piece (19) that is supported between the end wall (2) and the cylinder (4). An annular protrusion (20) having an inverted V-shaped cross section facing in the direction is continuously provided.

  The inner peripheral edge of the annular protrusion (20) is located substantially on the same plane as the outer surface of the annular sandwich piece (19) (Claim 2).

However, as shown in FIG. 3, the inner peripheral edge (20a) of the annular protrusion (20) may be levitated inward from the outer surface of the annular sandwich piece (19).
In this case, when the piston (9) pushes the annular protrusion (20) of the buffer packing (3), the energy of the piston (9) is absorbed by first displacing the annular protrusion (20) outward. Further, when the piston (9) moves forward with surplus energy, the annular protrusion (20) is pushed outward, and the inner peripheral edge (20a) abuts against the inner surface of the end wall (2), so that an outward V-shaped cross section is obtained. An annular sealed space is formed. By pressurizing the air in the sealed space, the large kinetic energy of the piston (9) is also absorbed.

  FIG. 4 shows a shock absorbing packing (21) in the linear vibration type compressor of the present invention as defined in claim 4, wherein a tubular projection (23) facing inward is formed on the inner peripheral end of the annular pinching piece (22). It is provided integrally. A cut may be made in a part of the tubular projection (23).

  Even in this case, the same effect as the buffer packing (3) according to claims 1 to 3 is exhibited, and the impact at the initial stage when the end surface of the piston (9) is in contact with the tubular projection (23). Absorption power can be increased.

It is a vertical front view which shows one Embodiment of this invention. It is the II-II line longitudinal cross-sectional view in FIG. It is a longitudinal cross-sectional view which shows the example from which a buffer packing differs. It is a longitudinal cross-sectional view which shows the further different example of a buffer packing.

Explanation of symbols

(1) Housing
(2) End wall
(3) Buffer packing
(4) Cylinder
(5) Fitting hole
(6) Coil
(7) Magnetic yoke
(8) Permanent magnet
(9) Piston
(10) Drive shaft
(11) Movable iron core
(12) Plate valve
(13) Discharge hole
(14) Plate valve
(15) Suction hole
(16) Inward flange
(17) Inlet hole
(18) Outlet hole
(19) Annular clamping piece
(20) Annular projection
(20a) Inner edge
(21) Annular packing
(22) Annular clamping piece
(23) Winding tubular projection

Claims (4)

A piston attached to a drive shaft capable of electromagnetically vibrating linearly is fitted into the cylinder, and the end surface of the piston moves closer to and away from the end wall of the cylinder in accordance with the reciprocating vibration of the drive shaft. In a linear vibration type compressor that is pressurized by inhalation,
On the inner side surface of the end wall of the cylinder, a buffer packing formed by connecting an annular protrusion having an inverted V-shaped cross section facing the axial direction on the inner periphery of an annular sandwich piece made of a flexible material is fastened.
When the outer end surface of the piston comes into contact with the buffer packing, the annular projection is pushed to absorb the impact, and the air in the space surrounded by the outer end surface of the piston, the annular projection and the end wall of the cylinder is compressed. Linear that absorbs impact and absorbs impact by compressing the air in the annular space surrounded by the annular projection and the end wall of the cylinder by pressing the annular projection Vibration type compressor. The inner periphery of the annular projection, claim 1 linear vibrating compressor according made by positioned on the outer surface and the same surface of the annular holding support piece.   The linear vibration type compressor according to claim 1, wherein an inner peripheral edge of the annular protrusion is floated inward from an outer surface of the annular sandwich piece. A piston attached to a drive shaft capable of electromagnetically vibrating linearly is fitted into the cylinder, and the end surface of the piston moves closer to and away from the end wall of the cylinder in accordance with the reciprocating vibration of the drive shaft. In a linear vibration type compressor that is pressurized by inhalation,
A buffer packing comprising a ring-shaped protrusion having a pipe-like cross section facing the axial direction is fixed to the inner surface of the end wall of the cylinder on the inner periphery of an annular clamping piece made of a flexible material. When the outer end surface comes into contact with the buffer packing, the annular projection is pushed to absorb the impact, and the air in the space surrounded by the outer end surface of the piston, the annular projection, and the end wall of the cylinder is compressed. A linear vibration type compressor characterized in that it absorbs water.

Images