JP2557773Y2 - Vibration compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vibration type compressor, particularly a vibration type compressor which generates a high-pressure gas by reciprocation of a piston. And a piston head protruded from the distal end surface of the piston body, and an inner peripheral surface of the cylinder portion between the piston head and the distal end surface of the piston body. It is provided with a piston ring which is slidably disposed while maintaining airtightness, and a radial ventilation groove serving as a ventilation flow path at the time of suction is formed on an end face of the piston head which comes into contact with the piston ring. Accordingly, the present invention relates to a vibration-type compressor designed to reduce noise during operation.

[Conventional technology]

2. Description of the Related Art Conventionally, a vibration-type compressor used as a compressor of, for example, an in-vehicle refrigerator has a structure as shown in FIG. In FIG. 1, a vibration type compressor 1 has a compressor body 3 in a cylindrical hermetic container 2 including a cylinder 2a and lid plates 2b and 2c for closing both open ends of the cylinder 2a. Five
It is configured to be elastically supported by.

The casing 6 of the compressor body 3 is configured by fixing a cylinder 8 to the other end or lower end of the yoke 7 in which one end or upper end of a cylindrical portion 7a is closed by a pot-shaped bottom 7b.
The bottom 7b is formed in a pot shape by, for example, forging, and then, for example, a stepped portion 7c that intersects perpendicularly with the inner peripheral surface of the cylindrical portion 7a by, for example, turning, and is fitted to the inner peripheral surface. The portion 7d is formed. Then, the bottom 7b and the cylindrical portion 7a are fixed (for example, welded) by fitting the fitting portion 7d to the inner peripheral surface of the cylindrical portion 7a as shown in the figure, whereby the yoke 7 is fixed. It is configured. The cylinder 8 is fitted to the lower end of the yoke 7. On the inner peripheral surface on the lower end side of the yoke 7, a mounting plate 9 formed by cutting out a part of a ring-shaped disk is mounted, and a plurality of screw members penetrating the cylinder 8 are provided. The cylinder 8 is fixed to the lower end of the yoke 7 by screwing the 10 to the mounting plate 9 and tightening.

Inside the casing 6, an arc-shaped permanent magnet 11 is fixed so as to contact the inner peripheral surface of the yoke 7 and the stepped portion 7c. A pole piece 13 for forming an annular gap 14 with the permanent magnet 11 is fixed to the bottom 7b via a permanent magnet (alnico magnet) 12, for example, by a screw member 15. .

In the gap 14, a drive coil 16 is disposed so as to be reciprocally movable in the axial direction of the casing 6, that is, in the up-down direction. The drive coil 16 is fixed to a support member 17, and the support member
17 is fixed to a cylindrical piston 18 concentric with the axis of the casing 6. Therefore, the drive coil 16 and the piston 18 are substantially integrated. The piston 18 is slid into a cylinder portion 19 provided integrally with the cylinder 8 so as to protrude into the casing 6. Further, a resonance spring 20 is interposed between the pole piece 13 and the support member 17, and the support member 17 and the terminal 34 on the cylinder 8 are disposed.
The resonance spring 21 is also interposed between the resonance spring 21 and d. Therefore, the piston 18 is supported by the pair of upper and lower resonance springs 20 and 21. Further, a suction valve 22 is provided at a lower end of the piston 18.

A cap-like lid 23 is fixed to a lower portion of the cylinder 8 by, for example, a bolt (not shown). A discharge valve chamber 25 located further below a cylinder chamber 24 located below the piston 18 in the cylinder section 19 between the cap-shaped lid 23 and the cylinder 8.
Are provided, and the high-pressure chamber 26 and the low-pressure chamber 27 are formed by closing the hole provided in the cylinder 8 with the cap-like lid 23. Further, a communication passage 28 that communicates between the discharge valve chamber 25 and the high-pressure chamber 26 is formed in the cap-shaped lid 23. Also,
A discharge pipe 29 communicating with the high-pressure chamber 26 is provided. The discharge pipe 29 penetrates through the cover plate 2c, is drawn out, and is connected to, for example, a condenser of a refrigerator (not shown). That is,
The high-pressure refrigerant compressed by the compressor is discharged to the condenser. The high-pressure refrigerant passes through a condenser, a capillary tube, and an evaporator to become low-pressure refrigerant,
Through a suction pipe 30a provided through the casing, a suction pipe 30 passing through the cap-shaped lid 23 and communicating with the low-pressure chamber 27, and a suction pipe 30c communicating the low-pressure chamber 27 with the inside of the casing 6. 6, which is introduced into the compressor body 3.

The discharge valve chamber 25 includes a discharge valve 32 that can be seated on a valve seat 31 provided in the cylinder 8 at a lower end of the cylinder chamber 24;
A press spring 33 that biases the discharge valve 32 in a direction to be seated on the valve seat 31 is housed.

A power supply terminal 34a is attached to the lid plate 2c. Further, connection members 34b, 34c, 34d for connecting the power supply terminal 34a and the resonance spring 21 are provided. The drive coil 16 and the resonance spring 21 are connected by a lead wire 35a, and the drive coil 16 and the resonance spring 20 are connected by a lead wire 35a.
connected by b. Accordingly, one end of the drive coil 16 is connected to the lead wire 35a, the resonance spring 21, and the connection members 34d, 34c, 3
4b, and the other end is connected to a lead wire 35b, a resonance spring 20, a pole piece 13, and a screw member 1.
5, connected to the closed container 2 via the bottom 7b and the spring 4. Therefore, an alternating current can be supplied to the drive coil 16 by applying an alternating voltage between the power supply terminal 34a and the sealed container 2.

Further, the bottom 7b and the cap-like lid 23 are provided with buffer members 36 and 37 formed in a ring shape by an elastic body such as rubber at positions corresponding to the protrusions 7b 'and 23'. Therefore, the undesired swing of the compressor body 3 can be suppressed to the minimum range by the buffer members 36 and 37.

With the above-described configuration, by supplying an alternating current to the drive coil 16, the piston 18 vibrates up and down together with the drive coil 16 according to the polarity of the alternating current. The vertical vibration of the piston 18 is amplified by a pair of upper and lower resonance springs 20 and 21. By the amplified vertical vibration of the piston 18, the suction valve 22 and the discharge valve 32 perform a so-called pumping action, and the fluid such as the refrigerant introduced into the container 2 by the pumping action flows into the suction pipes 30a, 30b, the low-pressure chamber. 27, flows into the inside of the casing 6 through the suction pipe 30c, flows into the discharge valve chamber 25 through the piston 18, the suction valve 22, the cylinder chamber 24 and the discharge valve 32, and further communicates with the communication path 28, the high-pressure chamber 26 and the discharge It is discharged to the condenser of the refrigerator through the pipe 29.

[Problems to be solved by the invention]

The conventional vibrating compressor shown in FIG. 8 generates a high-pressure fluid by opening and closing the suction valve 22 and the discharge valve 32 alternately in response to the vertical vibration of the piston 18. Therefore, during operation, noise is generated when the suction valve 22 and the discharge 32 open and close. In particular, the opening and closing noise of the intake valve 22 is extremely large, and the generation of noise by the intake valve 22 has been a problem.
As means for eliminating the opening and closing noise of the intake valve 22 and the like, there is also a means for eliminating the presence of the valve 22.However, during the process of introducing the fluid into the cylinder chamber at the time of suction, the fluid is injected into the cylinder chamber at once. If so, noise will be generated.

The present invention solves the above undesired problems,
It is an object of the present invention to provide a vibrating compressor in which the suction valve 22 prevents noise generation.

[Means for solving the problem]

The present invention relates to a vibration type compressor that generates a high-pressure gas by reciprocation of a piston, wherein the piston includes a piston main body and a piston head protruding from a tip end surface of the piston main body. Between the piston head and the distal end surface of the piston body,
A piston ring disposed slidably while maintaining an airtight seal with the inner peripheral surface of the cylinder portion, and a radial ventilation path serving as a ventilation flow path at the time of inhalation at an end face of the piston head in contact with the piston ring. It is characterized in that a groove is formed.

 Hereinafter, description will be made with reference to the drawings.

〔Example〕

FIG. 1 is a configuration diagram of a piston tip portion in one embodiment of the present invention, FIG. 2 is a perspective view of one embodiment of a piston head in the present invention, and FIGS. 3A and 3B are diagrams of FIG. FIG. 4 is an explanatory view of the operation of the embodiment, FIG. 4 is a structural view of the tip of the piston in another embodiment of the present invention, FIGS. 5 (A) and (B) are explanatory views of the operation of the embodiment shown in FIG. FIG. 6 is a block diagram of a piston tip portion according to still another embodiment of the present invention, and FIGS. 7A and 7B are explanatory diagrams of the operation of the embodiment shown in FIG. In the drawing, reference numeral 18a denotes a piston projection, 18b denotes a piston tip surface, 41 denotes a piston head, 41a denotes a press-fit portion, 41b denotes a ventilation groove, 42 denotes a piston ring, 43 denotes a ventilation hole, and 44 denotes a step portion. The other symbols correspond to FIG.

The present invention has basically the same configuration as the vibration compressor described at the beginning of the present specification, except for the configuration of the piston tip portion shown in FIG. That is, as shown in FIG. 1, the tip of the piston in the vibration type compressor of the present invention has a piston projection 18a projecting from the tip of the piston 18, and the piston projection 18a has a piston head 41 ( 2 (shown in FIG. 2) is fixed. The piston head 41 is, as shown in FIG.
A press-fitting portion 41a for press-fitting and fixing the piston projection 18a is provided, and a plurality of ventilation grooves 41b are formed radially on the end face of the press-fitting portion 41a.
As shown in FIG. 1, at the tip of the piston in the vibration type compressor of the present invention, between the piston 18 and the piston head 41, the inner peripheral surface of the cylinder 19 is kept airtight and A slidably disposed piston ring 42 is provided. The operation of the embodiment shown in FIG. 1 will be described below with reference to FIGS. 3 (A) and 3 (B). In addition,
FIG. 3A is an explanatory diagram for explaining the operation at the time of compression, and FIG. 3B is an explanatory diagram for explaining the operation at the time of suction.

During compression, the piston 18 is driven in the direction of the cylinder chamber 24 (the direction of the arrow A in the drawing) as shown in FIG. 3 (A). At this time, along with the movement of the piston 18, the piston ring 42 is pushed by the piston tip end surface 18b of the piston 18, and the piston ring 42 is also driven in the direction of the arrow A in the drawing, and the fluid such as the refrigerant in the cylinder chamber 24 is compressed.

At the time of inhalation, as shown in FIG. 3B, the piston 18 is driven in the direction opposite to that at the time of compression (the direction of arrow B in the drawing). Then, with the movement of the piston 18, the piston ring 42 is pushed by the piston head 41, so that the piston ring 42 is also driven in the direction of arrow B in the figure. At this time, as shown by the arrow a in the figure, the gap between the piston 18 and the cylinder portion 19, the gap between the piston ring 42 and the piston projection 18a, and the plurality of A fluid such as a refrigerant is introduced into the cylinder chamber 24 through the ventilation grooves 41b and the gap between the inner peripheral wall of the cylinder portion and the outer peripheral side surface of the piston head.

As described above, the compression and suction operations of the vibration type compressor of the present invention are performed by repeating the states shown in FIGS. 3 (A) and 3 (B). In the present invention, since the suction operation is performed without providing the suction valve 22 in the conventional example shown in FIG. 8 described at the beginning of the specification of the present application, the conventional opening and closing of the suction valve 22 is performed. The noise generated by the operation can be greatly reduced, and the noise caused by the fluid being injected into the cylinder chamber at once is not generated.

Further, there is an advantage that the assembling work of the piston ring 42 is easy because one-way assembling is possible.
Further, since a suction passage (ventilation groove 41b) for a fluid such as a refrigerant is formed in the piston head 41, it can be integrally formed by sintering or the like, and cost can be reduced.

In the embodiment shown in FIG. 4, a vent hole 43 penetrating the outer peripheral surface and the inner peripheral surface of the piston 18 is formed near the piston tip surface 18b of the piston 18. The other structure is the same as that of the embodiment shown in FIG.
The operation of the embodiment shown in FIG. 4 will be described below with reference to FIGS. 5 (A) and 5 (B). FIG. 5A is an explanatory diagram for explaining the operation at the time of compression, and FIG. 5B is an explanatory diagram for explaining the operation at the time of suction.

The operation at the time of compression is shown in FIG.
The operation is the same as the operation shown in FIG.

In the operation at the time of suction, as shown in FIG. 5 (B), the piston 18 is driven in the direction opposite to that at the time of compression (the direction of arrow B in the drawing). And, with the movement of the piston 18,
The piston ring 42 is pushed by the piston head 41
Is also driven in the direction of arrow B in the figure. At this time, the arrow a
As shown in the figure, the ventilation hole 43, the gap between the piston ring 42 and the piston projection 18a, and the plurality of ventilation grooves 41 formed in the piston head 41.
A fluid such as a refrigerant is introduced into the cylinder chamber 24 via b.

The embodiment shown in FIG. 4 described above basically has the same effect as the embodiment shown in FIG.
Since the ventilation hole 43 is provided as a fluid flow path at the time of the suction operation, the gap between the piston 18 and the cylinder portion 19 is not used as the fluid flow path at the time of the suction operation.
By utilizing the inside of the piston 18 via 43, the flow path resistance can be significantly reduced, and the suction operation can be performed efficiently. In addition, as shown in FIG. 4, the flow path resistance can be further reduced by expanding the outlet of the vent hole 43 using a processing means such as a counterbore.

The embodiment shown in FIG.
A step portion 44 is formed from the opening position of the ventilation hole 43 to reach the piston tip surface 18b. Other configurations are the same as those of the embodiment shown in FIGS. 1 and 4. Hereinafter, with reference to FIGS. 7A and 7B, FIG.
The operation of the illustrated embodiment will be described. FIG. 7A is an explanatory diagram for explaining the operation at the time of compression, and FIG. 7B is an explanatory diagram for explaining the operation at the time of suction.

The operation at the time of compression is shown in FIG. 7 (A).
The operation is the same as that shown in FIGS. 3 (A) and 5 (A).

In the operation at the time of suction, as shown in FIG. 7 (B), the piston 18 is driven in the direction opposite to that at the time of compression (the direction of arrow B in the drawing). And, with the movement of the piston 18,
The piston ring 42 is pushed by the piston head 41
Is also driven in the direction of arrow B in the figure. At this time, the arrow a
As shown by, through the ventilation hole 43, the step portion 44, the gap between the piston ring 42 and the piston projection 18a, and a plurality of ventilation grooves 41b formed in the piston head 41, A fluid such as a refrigerant is introduced into the cylinder chamber 24.

The embodiment shown in FIG. 6 described above has basically the same effects as those of the embodiment shown in FIGS. 1 and 4 except that the vent hole 43 is used as a fluid flow path during the suction operation.
Further, since the step portion 44 is provided, the flow resistance of the fluid at the time of the suction operation can be greatly reduced, and the suction operation can be performed more efficiently.

[Effect of the invention]

As described above, according to the present invention, it is possible to provide a vibration type compressor having the following excellent effects. That is, since the suction operation is performed without providing the suction valve, it is possible to greatly reduce the noise that has conventionally been generated due to the opening and closing operation of the suction valve. Also, no noise is generated due to the sudden injection of fluid into the cylinder chamber.

The work of assembling the piston ring has the advantage that it is easy because one-way assembly is possible.

Since a ventilation groove is formed in the piston head as a suction passage for a fluid such as a refrigerant, it can be integrally formed by sintering or the like, and cost can be reduced.

As a fluid flow path during the suction operation, the suction operation is performed by using the inside of the piston through the vent hole and the stepped portion without using the gap between the piston and the cylinder portion, thereby performing the suction operation during the suction operation. The flow path resistance can be greatly reduced, and the suction operation can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a piston tip portion in one embodiment of the present invention, FIG. 2 is a perspective view of one embodiment of a piston head in the present invention, and FIGS. 3A and 3B are diagrams of FIG. FIG. 4 is an explanatory view of the operation of the embodiment, FIG. 4 is a structural view of the tip of the piston in another embodiment of the present invention, FIGS. 5 (A) and (B) are explanatory views of the operation of the embodiment shown in FIG. FIG. 6 is a structural view of a piston tip portion in still another embodiment of the present invention, FIGS. 7 (A) and (B) are explanatory views of the operation of the embodiment shown in FIG. 6, and FIG. 8 is a vibration type compressor. FIG. In the figure, 18 is a piston, 18a is a piston projection, 18b is a piston tip surface, 19 is a cylinder part, 24 is a cylinder chamber, 41 is a piston head, 41a is a press-fitting part, 41b is a ventilation groove, and 42 is a piston groove.
A ring 43 represents a vent, and 44 represents a step.

Claims (3)

(57) [Scope of request for utility model registration] A piston supported by a resonance spring, and a drive unit for causing the piston to resonate with the resonance spring by applying an alternating voltage to reciprocate the piston. In a vibratory compressor that generates a high-pressure gas of a refrigerant indoors, the piston includes a piston body and a piston head protruding from a tip end surface of the piston body, and the piston Between the head and the distal end surface of the piston main body, while maintaining the airtightness with the inner peripheral surface of the cylinder portion and being pressed in an airtight state by the surface of the piston main body portion, and on the piston ring side of the piston head; A piston ring slidably disposed so as to be reciprocated by being pressed by the end face; A radial ventilation groove serving as a ventilation passage at the time of inhalation is formed in the piston ring side end surface of the piston head in contact with the piston head, and fluid sucked into the cylinder chamber is allowed to flow from the inner peripheral wall of the cylinder portion to the piston. Through the surface of the main body and the central opening of the piston ring, pass through the ventilation groove of the piston head, and pass between the outer peripheral side surface of the piston head and the inner peripheral wall of the cylinder portion to the cylinder chamber. A vibratory compressor configured to be guided. 2. The piston main body is formed of a cylinder having a closed distal end surface, and has a ventilation hole passing through the outer peripheral surface and the inner peripheral surface of the cylinder at a position near the distal end surface. The vibration type compressor according to claim 1, wherein: 3. The vibration-type compressor according to claim 2, wherein a stepped portion is formed on the outer peripheral surface of the cylinder from the opening position of the vent hole to the tip end surface.