JPS6338384Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibratory compressor, and particularly to a vibratory compressor that uses ferrite magnets as permanent magnets provided in the compressor and is designed to reduce the outer diameter of the compressor. It is something.

In general, what is called a vibratory compressor is constructed by combining the principle of a dynamic speaker consisting of a magnet and a voice coil with the principle of mechanical resonance using a spring, and its operation depends on the electrical system. It is the same as a synchronous motor, and can be thought of as a combination of the mechanical vibration principle. This type of vibratory compressor is widely used as a compressor for refrigerators, an air compressor, and the like.

Conventionally, alnico magnets have been used as permanent magnets for the vibratory compressors, but as is generally well known, the alnico magnets have a very high cobalt content. Therefore,
Due to the recent shortage of cobalt resources, the price of alnico magnets has soared. As a result, ferrite magnets have attracted attention from the perspective of stable supply of magnets, and the inventors of this application have already proposed a vibratory compressor using the above ferrite magnets in Japanese Patent Application No. 84108/1983. are doing. As proposed in the above patent application, due to the inherent magnetic properties of the ferrite magnet, in order to have the same magnetic energy when comparing the ferrite magnet and the alnico magnet, Ferrite magnets have a larger cross-sectional area than alnico magnets,
Moreover, it is necessary to have a thin so-called flat shape. Therefore, when using ferrite magnets in place of alnico magnets used in conventional vibratory compressors, if sufficient consideration is not given to the placement of the ferrite magnets, the This means that the outer shape must be changed or the outer diameter dimension must be increased. Therefore, as shown in FIG. 1, it has been considered to make the shape of the ferrite magnet arcuate.

Figures 1 and 2 each show an example of a swing motor in a vibratory compressor, with reference numeral 1 in the figure.
1 is a ferrite magnet, 2 is an external core, 3 is an internal core, 3' is a magnetic pole formed in a cylindrical shape at a predetermined interval in a portion of the internal core 3 facing the ferrite magnet 1, and 4 is a ferrite magnet. annular magnetic gap, 5
6 is a vibration coil, 6 is a cylinder fixing vault for fixing a cylinder block (not shown) to the external core 2, 7 is a screw hole, and 8 is a protrusion that protrudes from the inner peripheral surface of the external core 2. The screw holes 7 are shown in FIG. Further, D is the outer diameter dimension when the arc-shaped ferrite magnet 1 is arranged in an annular shape, D' and
D″ is the outer diameter dimension of the outer core 2.

In FIGS. 1A and 1B showing a sectional view and a plan view of an example of a swing motor in a vibratory compressor, the ferrite magnet 1 is located in a space where the ferrite magnet 1 and the magnetic pole 3' face each other, that is, in the annular magnetic gap 4. , the external iron core 2 and the internal iron core 3 form a magnetic field, so when an alternating current is supplied to the vibrating coil 5 disposed in the annular magnetic gap 4 and supported by a spring body, the vibration The coil 5 is given a force to vibrate according to the frequency of the supplied alternating current, and drives a piston (not shown) that is substantially integrally connected to the vibrating coil 5. A cylinder block (not shown) is fixed by a cylinder fixing vault 6, and the reciprocating movement of the piston caused by the vibration causes the compression cylinder, for example, freon gas, to be generated in the cylinder block. The compressed high pressure gas is supplied to the condenser of the refrigeration system.

The outline of the operating principle of the vibratory compressor has been described above. ′) is approximately determined by Therefore, in order to reduce the outer diameter of the vibratory compressor, it is necessary to reduce the outer diameter of the outer core 2.

The outer core 2 in the example shown in FIG. 1 has a uniform thickness sufficient to install the screw hole 7, and the outer core 2 in the example shown in FIG. The portion is formed to have a thickness within the allowable minimum diameter limit. Therefore, in comparing the example shown in FIG. 1 and the example shown in FIG. 2, if the outer diameter D of the ferrite magnet 1 is the same, the example shown in FIG. 2 has a smaller outer diameter of the outer iron core 2. I can do it. However, in comparing the effective area on which the magnetic flux of the ferrite magnet 1 acts, the example shown in FIG. 2 has a smaller area corresponding to the protrusion 8. As described above, each of the examples shown in FIGS. 1 and 2 has advantages and disadvantages.

The purpose of the present invention is to solve the above-mentioned problems, and by replacing the expensive alnico magnets conventionally used in vibratory compressors with inexpensive ferrite magnets, it also solves the cost problem. i) Providing a projection on the inner peripheral surface of the outer core on which the cylinder fixing means is installed; (ii) An arc-shaped ferrite magnet arranged along the inner peripheral surface of the outer core. The above problem is solved by providing an engaging groove having a cross-sectional shape corresponding to the protrusion in the longitudinal direction of the surface in contact with the protrusion. That is, the present invention provides a vibratory compressor that can reduce the outer diameter of the outer core without reducing the effective magnetic flux in the annular magnetic gap in which the vibrating coil is arranged. is intended to provide. This will be explained below with reference to the drawings.

FIG. 3 is a side cross-sectional view showing the configuration of an embodiment of the vibratory compressor of the present invention, FIG. 4A is a plan view of the external iron core and ferrite magnet in the configuration shown in FIG. A cross-sectional view taken along A-A′,
5A and 5B show a top and side view, respectively, of the ferrite magnet shown in FIG. 4. FIG. Reference numerals 1 to 8 in the figures correspond to FIGS. 1 and 2, 1' is an engagement groove, 9 and 10 are resonance springs, 11 is a coil support, 12 is a piston, 13 is an intake valve, 14 is a compression cylinder, 15 is an exhaust valve, 16 is a cylinder block, 17 is a distance case, 18 is an intake port, 18' is an internal suction pipe, 19 is a discharge port, 19' is a discharge pipe,
19″ is a pipe accommodation groove, 20 is a lead terminal, 2
0' represents a lead wire, and 21 represents a housing.

In FIG. 3, which shows the configuration of an embodiment of the vibratory compressor of the present invention, the explanation of the configuration and operation of the swing motor overlaps with the explanation regarding FIG. 1, so it will be omitted here, and other parts will be explained. . The piston 12 is constructed substantially integrally with the vibrating coil 5 via the coil support 11, and is driven by the vibrating coil 5. These vibration systems are supported by resonance springs 9 and 10 so that they can vibrate. Above piston 1
A cylinder block 16 with a compression cylinder 14 fitted into the distance case 1
7 and is fixed to the external core 2 by a cylinder fixing vault 6 (detailed explanation regarding the fixing means will be given later in FIG. 4). In the vibrating compressor configured as described above, when an alternating current is supplied to the vibrating coil 5 via the lead terminal 20 and the lead wire 20', the vibrating coil 5 responds to the frequency of the alternating current as described above. The piston 12 is driven by vibration. Due to the reciprocating motion of the piston 12, the refrigerant, such as Freon gas, flowing in from the suction port 18 is guided inside the housing 21 in the direction of the arrow (dotted line) shown in the figure, and further passes through the internal suction pipe 18' in the direction shown by the arrow (dotted line). It is introduced into the compression cylinder 14 as shown by the dotted line). The high-pressure refrigerant compressed by the piston 12 is discharged in the direction of the arrow (solid line) shown in the figure, and is discharged from the discharge pipe 1.
9', and is injected through the discharge port 19 to the condenser of the refrigeration system. Needless to say, the intake and exhaust of Freon gas in the compression cylinder 14 is performed by alternately opening and closing the intake valve 13 and the exhaust valve 15 in response to the reciprocating motion of the piston 12. Further, the intermediate portion of the discharge pipe 19', which is not shown in FIG. Although not shown, it can be assumed that similar pipe accommodating grooves are formed on the outer peripheral surfaces of the cylinder block 16 and distance case 17.

The configuration and operation of the vibratory compressor of the present invention have been described above, and as is clear from FIG. It is no exaggeration to say that. Therefore, in the vibratory compressor of the present invention, consideration is given to reducing the outer diameter of the external iron core 2 without reducing the effective magnetization of the ferrite magnet 1. That is, as shown in FIG. 4, a protrusion 8 is formed on the inner circumferential surface of the outer core 2 and has a screw hole 7 into which the cylinder fixing vault 6 (shown in FIG. 3) is set. ing. Further, as shown in FIG. 5, the ferrite magnet 1 disposed along the inner circumferential surface of the external iron core 2 is provided with an engaging groove 1' in the axial direction that engages with the protrusion 8. It is being Therefore, when arranging the ferrite magnet 1 on the inner circumferential surface of the external iron core 2, the engaging groove 1' is aligned with the protrusion 8.
It can be easily inserted and placed in one piece by engaging with the other parts. The protrusion 8 is connected to the screw hole 7.
Since the protrusion has the minimum cross-sectional area necessary to create an annular magnetic gap, the magnet area is unlikely to be reduced by providing the engaging groove 1' in the ferrite magnet 1. The inner periphery of the ferrite magnet 1 forming the magnet 4 (shown in FIG. 3) is a substantially continuous cylindrical surface, so that the magnetic properties of the ferrite magnet 1 are not deteriorated. The embodiment shown in FIGS. 4 and 5 shows an embodiment in which the ferrite magnet 1 is divided into three parts, that is, formed into an arc-shaped body with a central angle of 120 degrees.
It may be formed into an integral cylindrical shape, and an engagement groove having a cross-sectional shape corresponding to the cross-sectional shape of the projection 8 may be provided in the axial direction at a position corresponding to the projection 8 on the outer peripheral surface of the cylinder. In addition, the above figures 4 and 5
In the figure, each adjacent ferrite magnet 1
An example is shown in which the two are in close contact with each other, but in order to improve workability during insertion, a slight gap may be provided.

As explained above, according to the present invention, it is possible to use an inexpensive ferrite magnet as a permanent magnet without making the outer diameter larger than that of conventional magnets, and the magnet can be easily assembled. It is possible to provide a vibratory compressor that is inexpensive and highly productive.

[Brief explanation of the drawing]

1A and 1B are a sectional view and a plan view showing an example of a swing motor in a conventional vibratory compressor, FIG. 2 is a plan view showing another example of a swing motor in a vibratory compressor, and FIG. The figure is a side cross-sectional view showing the configuration of an embodiment of the vibratory compressor of the present invention, FIG. 4A is a plan view of the external iron core and ferrite magnet in the configuration shown in FIG. 3, and FIG. 4B is the configuration shown in FIG. 4A. A cross-sectional view taken along line A-A', FIGS. 5A and 5B show a top and side view, respectively, of the ferrite magnet shown in FIG. In the figure, 1 is a ferrite magnet, 1' is an engagement groove, and 2
is an external iron core, 3 is an internal iron core, 3' is a magnetic pole, 4 is an annular magnetic gap, 5 is a vibration coil, 6 is a cylinder fixing vault, 7 is a screw hole, 8 is a protrusion, 9 and 10 are resonance springs, 11 1 is a coil support body, 12 is a piston, 13 is an intake valve, 14 is a compression cylinder, 1
5 is an exhaust valve, 16 is a cylinder block, 17 is a distance case, 18 is an intake port, 18' is an internal suction pipe, 19 is a discharge port, 19' is a discharge pipe, 19'' is a pipe accommodation groove, 20 is a lead terminal,
20' represents a lead wire, and 21 represents a housing.

Claims (1)

[Scope of utility model registration request] A pot-shaped external core and a central angle disposed along the inner peripheral surface of the external core in direct contact with the external core.
A permanent magnet having an arc shape including 360 degrees and an inner core having magnetic poles facing the permanent magnet at a predetermined distance and forming a magnetic path together with the outer core, the permanent magnet and the inner core A vibrating coil is disposed in an annular magnetic gap formed by the magnetic poles, and a cylinder block having a piston integrally connected to the vibrating coil and having a compression cylinder is provided in the external iron core. In the vibratory compressor configured to be fixed by means, the permanent magnet is a ferrite magnet, and the external iron core is formed on an annular inner circumferential surface and protrudes toward the center from the inner circumferential surface. The ferrite magnet has a plurality of protrusions on which the fixing means are disposed, and the ferrite magnet has an engaging groove having a cross-sectional shape corresponding to the protrusion in the longitudinal direction of the surface in contact with the external iron core, and the ferrite magnet has a plurality of protrusions on which the fixing means is disposed. A vibratory compressor characterized in that the protrusion is inserted into and attached to the external core by engaging the protrusion in an engagement groove.