JPS60222577A - Compressor - Google Patents

Abstract

PURPOSE:To prevent the breakage and transverse shift of a valve plate by increasing the rigidity by making the width of a fixed part broader than the valve width on the free edge side of a suction valve and forming the suction valve so that the increase of the local stress in the vicinity of the fixed part is suppressed. CONSTITUTION:As for a suction valve 10, the width of the valve spreads to a tapered form from the free edge part 10b and extends immediately before the cylinder inner peripheral circle 3b. The width of the tapered part on the fixed part 10a side of the suction valve 10 is (m). While, the width of the fixed part 10a is broader (n) than (m). The width is reduced with a smooth curve form the position of the inflection point P of the fixed part 10a. The curve connects the outer-shape width in tapered form starting from the free edge 10b of the suction valve 10.

Description

Detailed Description of the Invention (Field of Industrial Application) This book relates to an improvement for improving the performance of a compressor having a long suction valve fixed to a valve seat plate between a rotary cylinder and a cylinder head. It is.

(Prior Art) A suction valve conventionally used in a compressor has a rectangular type valve plate having a constant length in the width direction (valve width) as shown in FIG.
A tapered type valve plate shown in FIG. 5 is used.

However, in recent years, compression has increased the load on a single cylinder engine, and as a result, the usage conditions of the suction valve have become harsher. Since the valve width is relatively small, the rigidity of the fixed part is weak, and if the load on the device is large, there is a problem of damage to the fixed end side of the suction valve.

In other words, if the valve plate width is constant, the width from the free end to the fixed part is a straight line, so the movement state propagates to the fixed part of the valve plate due to repeated opening and closing movements, as shown in Fig. 6. As shown in Figure 2, it is easy to locally deform due to repeated stress, cracks occur near the fixed part A, and the valve plate breaks.

On the other hand, with a tapered valve plate, if the taper angle is increased, the operating efficiency in opening and closing the valve will decrease, so the width on the fixed part side cannot be made much wider than the valve width on the free end side. Since the outline is a straight line, the same result as above will be produced.

Furthermore, when the suction valve opens, it comes into contact with the open end of the cylinder, causing abnormal wear E as shown in FIG. 7, which may cause breakage.

To prevent this, if a relief is provided on the upper end surface of the cylinder, the volumetric efficiency will decrease and the cost due to machining will increase.Furthermore, the part that is subjected to repeated stress will move toward the fixed part, causing the valve fixing member to move toward the fixed part. This results in additional disadvantages in that the fixing member is subject to loosening and wear.

It is also possible to increase the plate thickness of the suction valve in order to increase its rigidity, but in this case, the valve opening during suction cannot be kept large, resulting in a problem of large suction loss and reduced suction efficiency.

Therefore, the thickness of the suction valve is thin, and it is possible to prevent the valve from shifting laterally due to loosening of the valve fixing member without the need for recess machining at the end of the inner circumferential circle of the cylinder, and the compressor has a suction valve that can withstand high loads. development is required.

(Objective of the Invention) This calendar silk was devised in response to the above-mentioned demands, and its purpose is to increase the rigidity by widening the valve width on the free end side and the width of the fixed part. Reduces contact with the end of the cylinder inner circumference and local stress increases near fixed parts, prevents valve plate breakage and sideways slipping, maintains efficiency of valve opening/closing operation, and allows suction to withstand high loads. An object of the present invention is to provide a compressor having a valve.

(Structure of the Invention) In order to achieve the above object, the present eaI 11 is interposed between the cylinder head and the opening peripheral portion on one end side of the cylinder,
a valve seat plate having a suction hole through which air is taken; and a suction fixed between the valve seat plate and the opening peripheral edge of the cylinder, the free end of which opens and closes the suction hole according to the reciprocating motion of the piston. In the compressor, the widthwise length of the fixed portion of the suction valve is larger than the widthwise length of the free end portion of the suction valve, and the suction valve is located on the fixed portion side of the compressor. It is characterized in that the length in the width direction is narrowed with a predetermined curvature along the free end from the portion that contacts the valve seat plate on the substantially inner circumference of the cylinder.

With this configuration, the length of the suction valve fixing part in the width direction is increased to increase the rigidity, and the cylinder is extended from the part that contacts the valve seat plate on the inner circumference to the free end. Since the length in the width direction is narrowed with a predetermined curvature, the stress concentration on the fixed part side is dispersed, and the repeated stress caused by opening and closing the valve can be withstood, and the load on the fixed part can be reduced.

Therefore, it is possible to prevent cracks in the fixed portion of the suction valve, friction due to abnormal contact with the open end of the cylinder, and lateral displacement of the suction valve, thereby increasing the reliability of the compressor.

(Example) An example of main part aB will be described based on the drawings.

As shown in FIG. 1, the compressor main body 1 has a piston 4 slidably inserted into a cylinder 3 having a plurality of fins 2 on the outer wall, and a valve inserted into the opening periphery 58 of the cylinder 3 via a packing 5. A seat plate 6 is arranged, and a head gasket 7 is further provided on the seat plate 6 to form a trap for mounting a cylinder head 8.

A suction hole 9 and a discharge hole (not shown) are formed in the valve seat plate 6, and a strip-shaped suction valve 10 closes the suction hole 9 in the valve seat plate 6 on the cylinder 3 side. A valve fixing member 12 is inserted into a hole 11 provided at one end of the suction valve 10, and the valve seat plate 6Vc is fixed.

The opening peripheral edge 5at/C of the cylinder 3 is connected to the valve fixing member 12.
A recess 3c is provided to allow the water to escape.

The suction valve 10 has a free end 10b that opens and closes the valve using the fixed part fOa as a fulcrum. j; y) Specified.

As shown in Fig. 2, the suction valve 10 with an angle of θ8 has a width that extends from the free end 10b to a seat 7 (shaped) and extends to the front of the cylinder inner circumferential circle 3b, and on the fixed part 10a side on the extension. The width is m.On the other hand, the external width of the fixed part 10a side is a straight line with a width n which is even larger than m, and extends from the edge of the fixed part 10a side to the vicinity of the third circumferential circle 6b of the cylinder. It has a length of distance S.

The portion having this external width n is approximately the inner circumference circle 3b of the cylinder.
It is divided by the upper inflection point P, and from the position of the inflection point P, the width is narrowed with a smooth curve to connect it to the external width of the Theno (shaped) having a length B.

The operation of the compressor using the suction valve 10 configured in such a shape will be described.

When air is being sucked into the cylinder 3 in the compressor, the free end 10b of the suction valve descends to the bottom of the stepped portion 3d to open the suction valve 10, and when air is exhausted, the free end 10b is pressed against the valve seat plate 6. , makes a movement to close the suction valve 10.

This suction valve 10 has an inflection point P in a portion located on the cylinder inner circumferential circle 6b, and a peripheral portion A from there toward the free end 10b is tapered from the free end 10b side by a smooth curve. The part B is connected to the wide straight part of the fixed part 10a. Therefore, the number of repetitions K of the opening and closing operations of the suction valve 10 is
The resulting stress is not concentrated at the end of the cylinder inner circumferential circle 3b as in the conventional case, but is applied over a wide range of the smoothly curved portion of the suction valve 10.

The load placed on the tab fixing portion 14 can be reduced.

In this way, since the valve width on the free end portion 15 side is maintained at the desired width and only the valve width on the fixed portion 14 side is widened, the fixed portion 1
4, increases the rigidity of the parts of the valve that are prone to breakage, suppresses deformation during valve movement, and reduces contact with the cylinder inner circumferential circle 3b and local stress increases near the valve fixing member 12.
0 reliability can be improved.

Furthermore, since the distance l1gt between the valve fixing members can be set arbitrarily within the range of the valve width of the fixing part 14, by increasing this length t, the resistance torque against lateral displacement of the suction valve 10 is increased, and the suction valve This has the effect of preventing loosening of 10.

Further, FIG. 3 shows another embodiment of the present invention. This suction valve 10 has two holes 11 and 11 for inserting the valve fixing member 12 into the fixed part 10a side and fixing it to the valve seat plate 6, and extending from the free end part 10b side to the cylinder inner circumferential circle 3b. The front portion is formed by combining a straight portion C and a tapered portion B.

On the other hand, the fixed end 10a side maintains the distance S with the valve width nl7), and the suction valve 10 moves from the inflection point P, which is approximately above the inner circumferential circle 3b of the cylinder, to the periphery of the free end 10blC.
A is a smooth curve. Suction valve 1 in this case
0 also has the features of the present invention, so it has the above-mentioned effects.

(Effects) Since the θth valve of this invention has the above-mentioned configuration, compared to conventional suction valves, the rigidity is increased by making the valve width of the fixed part wider, and the distance between the valve fixing members is increased. Since t can be made large, breakage and misalignment due to cracking or loosening of the fixed portion can be prevented.

In addition, by dividing the valve width on the fixed part side at an inflection point on the inner circumference of the cylinder, and forming the peripheral part from the inflection point toward the free end side into a smooth curve, the width of the valve on the free end side is divided. It prevents the propagation of stress to the fixed end side due to the opening and closing movements of the valve, and disperses the stress concentration applied to this part, thereby preventing breakage due to deformation due to the opening and closing movements of the valve, wear due to contact with the end of the inner circumference of the cylinder, and the valve. Local stress near the fixing member can be reduced.

As a result of the above effects, machining of the relief at the top of the cylinder can be omitted, increasing the volumetric efficiency of the compressor and reducing costs.Increasing the rigidity and thinning the plate thickness also increases the suction efficiency. be able to.

[Brief explanation of drawings]

1 is a cross-sectional view of the main parts of a compressor showing a state in which the suction valve according to the present invention is installed; FIG. 2 is a plan view of the suction valve taken along line X-X in FIG. 1; Figure 6 is a plan view showing the plan view of a suction valve according to another embodiment of the present invention, Figure 6 is a diagram showing cracks occurring near the fixed part of the suction valve, Figure 7 is the end of the inner circumferential circle of the cylinder of the suction valve. FIG. 3 is a diagram showing abnormal wear due to contact with parts. 1. Compressor body 3. Cylinder 5 a. Opening periphery 3b.. Inner circumference 4. Piston 6. Valve seat plate 8. Cylinder head?・-Suction hole 10-・Suction valve 10a ・-Fixed part lb・-White end part Fig. 4 3h Fig. 6 Fig. 5h Fig. 7

Claims (1)

[Claims] (1) A valve seat plate that is interposed between the cylinder head and the opening periphery at one end of the cylinder and has a suction hole for sucking air, and fixed between the valve seat plate and the opening periphery of the cylinder. A long suction valve having a fixed portion and a free end portion of which opens and closes the suction hole according to the reciprocating motion of a piston, wherein the width direction length of the suction valve at the fixed portion is defined as the suction valve. The length in the width direction at the free end of the suction valve is also increased, and the width of the suction valve extends along the free end from the portion where the fixed portion tllllK contacts the valve seat plate on the substantially inner circumference of the cylinder. A compressor characterized in that its length in a direction is narrowed by a predetermined curvature.