JP2005036694A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a suction valve and a discharge valve from being adhered to a valve plate (to improve releasability) and to prevent airtightness from being lowered. <P>SOLUTION: This valve device includes the suction valve, the discharge valve and the valve plate coated with a resin in such a manner that an suction hole and a discharge hole are each formed to become a non-circular hole. Thus, worn positions of the resin coating parts of the suction valve and the discharge valve are dispersed into a plurality. In this manner, a non-adhesiveness of the resin which can leave a resin coating layer for a long period of time can be utilized, and the airtightness can be prevented from being lowered. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device used in a refrigerant compressor used in an automobile or the like.
[0002]
[Prior art]
In the refrigerant compressor, for the purpose of improving the performance, for example, in the suction hole, the suction efficiency is improved by increasing the opening area of the suction hole. However, the enlargement of the opening area generates a large fluctuating load on the intake valve, making it difficult to use at high rotation due to insufficient plastic deformation strength or lowering of the resonance point.
[0003]
Accordingly, the invention shown in Patent Document 1 has been developed, and a suction valve support portion that supports the suction valve when the suction valve is closed is provided on the valve plate. With this configuration, when the valve is closed, the suction valve support portion suppresses deformation of the suction valve toward the valve plate, and an effect of preventing plastic deformation of the suction valve due to a variable load is obtained.
[0004]
In addition, the suction valve or the discharge valve causes a sticking phenomenon of the valve plate due to the oil contained in the refrigerant, causing a delay in operation, and the pulsation noise due to the discontinuous opening / closing operation of the suction valve, the discharge valve and the valve plate is caused by the compressor. It was a cause of increased vibration noise. Therefore, the invention shown in Patent Document 2 has been developed, and at least the surfaces of the valve plate interposed between the cylinder block and the cylinder head, and the suction valve and the discharge valve that open and close the suction hole and the discharge hole formed in the valve plate are provided. Resinized. From this configuration, the separation between the intake valve and the discharge valve is improved.
[0005]
[Patent Document 1] JP-A-8-28449
[Patent Document 2] JP-A-9-280167
[0006]
[Problems to be solved by the invention]
In the former invention disclosed in Patent Document 1, although the fatigue strength is improved by the suction valve support portion, the law of setting the shape of the rib serving as the suction valve support portion is not clear, and fatigue is observed for all shapes. The problem is whether or not the effect of improving the strength appears, and the manufacture of a rib that enters the center of the suction hole also has a problem that causes an increase in cost.
[0007]
In the latter invention shown in Patent Document 2, it is confirmed that the separation performance is improved (that is, sticking prevention) because at least the surface of the valve device is coated with resin. When the suction hole is a simple circle, the resin coating on the entire circumference of the suction hole is worn away, and the refrigeration ability is deteriorated due to the decrease in airtightness as well as the separation property. It was discovered from the results of the applicant's experiment that the cause was the shape of the suction hole. That is, in the case of a simple circle, a support load is applied uniformly to the entire circumference of the hole.
[0008]
Accordingly, an object of the present invention is to make maximum use of the sticking prevention function, which is a characteristic of a resin, and to maintain the airtightness of the valve for a long period of time.
[0009]
[Means for Solving the Problems]
Therefore, a valve device according to the present invention is interposed between a cylinder block in which a cylinder bore is formed and a cylinder head, a valve plate in which a suction hole and a discharge hole are formed, and a cylinder having a suction hole formed in the valve plate. In a valve device including a suction valve disposed on a block side and a discharge valve disposed on a cylinder head side of the discharge hole, at least a part or all of the valve plate, the suction valve, and the discharge valve are at least The contacting surface is made of resin, and at least one or both of the suction hole and the discharge hole are formed as non-circular holes.
[0010]
With this configuration, at least part or all of the valve plate, the suction valve, and the discharge valve are covered with resin, so that the separation performance is improved and the suction hole is formed. In addition, the support load applied to the discharge valve is dispersed at a plurality of locations in the hole, and as a result, the resin coating layer does not progress at the portion where the support load is small, or even if there is wear, the support load is small. Since the transition resin coating layer can be left, the non-adhesive function can be maintained. Therefore, the separation property is improved (prevention of sticking), the airtightness is maintained, and the suction hole and the discharge hole are non-circular holes, so that the opening area can be increased as compared with the circular holes.
[0011]
Further, in order to use at least one or both of the valve plate, the suction valve, and the discharge valve as a resin, a resin coating is applied to each member (Claim 2), or a resin material is used. (Claim 3).
[0012]
Further, the non-circular holes of the suction hole and the discharge hole are holes having a circumference having at least one straight line such as a triangle, a quadrangle, and a pentagon, or any place of a gourd-shaped hole having a continuous curve. The tangent line may have two or more intersections.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 and 2, an enlarged sectional view of a main part of a refrigerant compressor used in an automobile air conditioner and an explanatory view seen from the cylinder block side of a suction valve. The compressor 1 is roughly divided into a cylinder block 2 and a cylinder head. 3 and a valve plate 4 held between the cylinder block 2 and the cylinder head 3. Reference numeral 11 denotes a gasket.
[0015]
The cylinder block 2 is made of an alloy material mainly made of a light metal such as aluminum, and has an appropriate number of cylinder bores 5 formed therein. A piston 6 is inserted into the cylinder bore 5, and the piston 6 is reciprocated in the cylinder bore 5 via a reciprocating mechanism (not shown), thereby increasing and decreasing the volume in the compression chamber 7 to introduce and compress the refrigerant. It works to discharge.
[0016]
The cylinder head 3 is also made of an alloy material mainly made of a light metal such as aluminum, and is divided into a suction chamber 9 and a discharge chamber 10 by a partition wall 8. The suction chamber 9 is connected to a refrigerant pipe from a suction joint (not shown). The discharge chamber 10 is connected to a refrigerant pipe from a discharge joint (not shown).
[0017]
The valve plate 4 is made of a metal material such as a saddle plate or aluminum, and the surface thereof is coated with a resin (PTFE) containing fluorine, and a suction hole 12 that allows the suction chamber 9 and the compression chamber 7 to communicate with each other. A discharge hole 13 for communicating the compression chamber 7 and the discharge chamber 10 is formed. The suction hole 12 has a triangular shape, and the discharge hole 13 has a square shape. The hole shape will be described below.
[0018]
A thin plate-like suction valve 15 that performs a flap operation is disposed on the cylinder block side of the suction hole 12, and a thin plate-shaped discharge valve 16 that performs a flap operation is disposed on the cylinder head side of the discharge hole 13 with a retainer 17. The cylinder block 2 and the cylinder head 3 are interposed and attached.
[0019]
The suction valve 15 and the discharge valve 16 are coated with a fluorine-containing resin (PTFE). Both valves 15 and 16 are coated on both surfaces, but may be one surface on the contact side.
[0020]
Next, in the valve mechanism having the above-described configuration, the piston 6 is lowered and the volume of the compression chamber 7 is increased, whereby the pressure in the compression chamber 7 is reduced. When the pressure in the compression chamber 7 falls below the pressure in the suction chamber 9, the suction valve 15 is opened and the suction chamber 9 and the compression chamber 7 are communicated. The opening degree of the intake valve 15 is restricted by hitting the stopper 19. In such an intake stroke, since the resin is coated not only on the intake valve 15 but also on the surface of the valve plate 4, the releasability is improved and no operation delay occurs.
[0021]
Further, when the piston 6 is reversed and moved toward the top dead center, the volume of the compression chamber 7 is reduced, and the pressure in the compression chamber 7 is increased relative to the pressure in the suction chamber 9. Contrary to the suction stroke, when the pressure in the compression chamber 7 exceeds the pressure in the suction chamber 9, the suction valve 15 moves upward, contacts the valve plate 4, and is closed.
[0022]
Thus, as the compression stroke proceeds, a large load (hereinafter referred to as a support load) is applied to the intake valve 15. That is, as shown in FIG. 3, the supporting load is gathered at three locations on the periphery of the substantially triangular suction hole 12 at the periphery shown by oblique lines, and in this portion, the resin coating is scraped away, but the other In this part, it has been confirmed that it will remain for a long time. Therefore, even if it is scraped off to some extent, there is no decrease in separation and airtightness.
[0023]
When the pressure in the compression chamber 7 exceeds the pressure in the discharge chamber 10 in the compression stroke, the discharge valve 16 opens and the compressed refrigerant is discharged into the discharge chamber 10. Even in this case, since the resin is coated not only on the discharge valve 16 but also on the surface of the valve plate 4, the separability is improved and no discharge delay occurs.
[0024]
Furthermore, when the piston 6 is reversed and moved toward the bottom dead center, the volume of the compression chamber 7 is expanded, and the pressure in the compression chamber 7 is reduced relative to the pressure in the discharge chamber 10. When the pressure in the compression chamber falls below the pressure in the discharge chamber 10, the discharge valve 16 moves downward, contacts the valve plate 4, and closes.
[0025]
Thus, as the intake stroke proceeds, a larger support load is applied to the discharge valve 16 as well. That is, in this case, as shown in FIG. 4, the support load gathers at four locations shown by hatching around the rectangular discharge hole 13, and the resin coating is scraped away in this portion, but the other In the part, it has been confirmed that it will remain for a long time. Therefore, even if it is scraped off to some extent, there is no decrease in separation and airtightness.
[0026]
As described above, by making not only the suction hole 12 but also the discharge hole 13 a non-circular hole, it is possible to enlarge the area as compared with the circular hole that has been adopted so far, and to the suction hole 15 and the discharge valve 16. The support load becomes partial, and there is scraping of the resin coating at that part, but the other part remains long, and there is no decrease in separation and airtightness.
[0027]
The hole shapes of the intake valve 15 and the discharge valve 16 are shown in FIGS. 5 to 13. FIG. 5 is a rectangular hole, and there are four portions (hereinafter referred to as contacts) where the support load is applied. 6 is a trapezoidal hole, 4 contacts, FIG. 7 is an octagonal hole, 8 contacts, FIG. 8 is a hexagonal hole, 6 contacts, FIG. 9 is a cross-shaped hole, 4 is a hole with a quadrangle as a basic shape and one side of which is a circular arc surface, contact points are four points, FIG. 11 is a hole with a quadrangle as a basic shape and an opposite surface is a circular arc surface, and there are four points of contact. FIG. 12 shows a star-shaped hole with five contact points. That is, from FIG. 3 to FIG. 12, although it is a non-circular hole, it has a circumference having a straight portion on at least one side.
[0028]
However, FIG. 13 shows a gourd-shaped hole, which is a non-circular hole, but has only a curved portion, and a tangent of a certain portion has two intersections of other circumferences. In this example, there are four contacts.
[0029]
In the above embodiment, the example in which the suction valve, the discharge valve, and the valve plate are coated with the resin is shown. However, there is no problem even if the resin is manufactured with the resin, and the same effects as those described in the above embodiment can be obtained. It is what In addition, the suction valve is resin-coated, the suction hole is a non-circular hole, the discharge valve is not a normal resin coating, and the circular hole is an embodiment of the present invention. Conversely, the discharge valve is resin-coated. The discharge hole is a non-circular hole, the suction hole is not provided with a normal resin coating, and the circular hole is an embodiment of the present invention, and the same effect can be obtained.
[0030]
【The invention's effect】
As described above, according to the present invention, the resin coating is applied to improve the separation between the suction valve and the discharge valve, and the suction hole and the discharge hole are non-circular holes. In parts where the load is dispersed and the support load is small, wear does not progress and even if there is wear, the resin coating layer can be left for a long time, and it has the effect of contributing to improvement in separation At the same time, there is no decrease in airtightness. .
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a compressor.
FIG. 2 is an explanatory view seen from the cylinder block side of the intake valve.
FIG. 3 is an explanatory view showing a portion to which a support load is applied in the suction valve arranged in the substantially triangular suction hole.
FIG. 4 is an explanatory view showing a portion where a support load is applied in a discharge valve arranged in a rectangular discharge hole.
FIG. 5 is a diagram illustrating an example in which a suction hole and a discharge hole are rectangular.
FIG. 6 is a diagram of an example in which a suction hole and a discharge hole are trapezoidal.
FIG. 7 is a diagram of an example in which the suction hole and the discharge hole are octagonal.
FIG. 8 is a diagram of an example in which a suction hole and a discharge hole are hexagonal.
FIG. 9 is a diagram illustrating an example in which the suction hole and the discharge hole are formed in a cross shape.
FIG. 10 is a view of an example in which one surface of the suction hole and the discharge hole having a quadrangular shape is an arc surface.
FIG. 11 is a diagram showing an example in which the suction hole and the discharge hole are formed in a quadrangular shape and two opposing surfaces are arcuate surfaces.
FIG. 12 is a diagram of an example in which a suction hole and a discharge hole are formed in a star shape.
FIG. 13 is an example of a hole having a suction hole and a discharge hole having a gourd shape, and a contact of the holed portion is a hole having two intersections on another circumference.
[Explanation of symbols]
1 Compressor 2 Cylinder block 3 Cylinder head 4 Valve plate 5 Cylinder bore 6 Piston 7 Compression chamber 9 Suction chamber 10 Discharge chamber 12 Suction hole 13 Suction hole 15 Suction valve 16 Discharge valve

Claims (5)

A valve plate interposed between a cylinder block formed with a cylinder bore and a cylinder head, and formed with a suction hole and a discharge hole;
A suction valve arranged on the cylinder block side of the suction hole formed in the valve plate;
In a valve device including a discharge valve arranged on the cylinder head side of the discharge hole,
Among the valve plate, the suction valve, and the discharge valve, at least a part or all of the valve plate, at least the surface to be in contact with resin,
A valve device characterized in that at least one or both of the suction hole and the discharge hole are formed as non-circular holes. 2. The valve according to claim 1, wherein at least part or all of the valve plate, the suction valve, and the discharge valve are coated with a resin so that at least a contact surface is made of resin. apparatus. 2. The valve device according to claim 1, wherein at least a part or all of the valve plate, the suction valve, and the discharge valve is made of a resin material so that at least a contact surface is made of resin. . 2. The valve device according to claim 1, wherein the non-circular holes of the suction hole and the discharge hole have a circumference having at least one straight line. 2. The valve device according to claim 1, wherein the non-circular hole of the suction hole and the discharge hole has a tangent at an arbitrary position of the hole having two or more fulcrums.

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