JPH0542280Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention aims to improve the sealing effect by providing a slotted portion in the seal component and expanding the slotted portion by a wedge action. This article relates to a seal structure with slotted slots.

(Prior Art) Since rubber gaskets with low heat resistance cannot be used for sealing parts and the like used in high-temperature atmospheres, metal contact type seal structures are exclusively used.

As an example, FIG. 4 shows a vertical cross section of a valve unit that employs a metal contact seal structure, and this valve unit has a disk-shaped valve seat 102 fixed at an intermediate height position within a cylindrical valve case 101. , the space above the valve seat 102 is partitioned by a partition wall 104 to form a suction passage 105 and a discharge passage 106, respectively. , discharge hole 108
These are reed valve-type suction and discharge valves that open and close, respectively.

Incidentally, the valve seat 102 and the partition wall 104 are in so-called metal contact at a portion B in the figure, and are sealed at this portion B to prevent fluid leakage.

(Problem to be Solved by the Invention) However, in the metal contact type seal structure described above, due to poor dimensional accuracy of the valve seat 102 and partition wall 104, or poor installation precision of both, the metal contact at part B cannot be made tightly. , there is a problem that the sealing performance is reduced. Furthermore, especially in an environment where there is a lot of vibration, play occurs in the sealing portion, which also causes the problem that the sealing performance deteriorates.

Therefore, the metal contact part (part B in Figure 1) was
It has been proposed to replace the seal structure with the line contact method shown in the figure or the fitting method shown in FIG. The properties of the metal contact type seal structure are significantly lowered, and the above-mentioned problems in the metal contact type seal structure cannot be effectively solved.

The present invention was devised in view of the above problems, and its purpose is to provide a slotted seal structure that can consistently ensure high sealing performance.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a slotted part at one end of two seal parts, and the end of one of the seal parts fits into the other part. The seal structure was constructed by providing a wedge-shaped protrusion that engaged with the groove and the slit portion of the seal component to widen the slit portion.

(Function) Thus, the end of the seal component provided with the slotted portion is fitted into the groove of the other seal component, and
When the slotted portion is engaged with the wedge-shaped protrusion of the other seal component, the slotted portion expands due to the wedge action and its both sides abut against the inner surface of the groove, ensuring high sealing performance. Ru. In addition, even if some play occurs between the two seal parts, only the abutment positions of both sides of the expanded slotted portion against the inner surface of the groove will change, and both sides of the slotted portion will still remain on the inner surface of the groove. Since they are in contact with each other, high sealing performance can always be obtained stably.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a valve unit having a slotted seal structure according to the present invention, in which numeral 1 denotes a cylindrical valve case having a stepped portion 1a on the inner periphery; A disk-shaped valve seat 2 is fastened with screws 3, 3 at an intermediate height position where it abuts the stepped portion 1a in the valve seat 1. The space above the valve seat 2 is divided into a suction passage 5 and a discharge passage 6 by a flat partition wall 4, but there are suction holes on the side of the valve seat 2 facing the suction passage 5 and the discharge passage 6. 7,
A discharge hole 8 is provided in each of the holes. Also, valve seat 2
A reed valve-type suction valve 9 is provided on the lower surface of the inlet 7 and is fastened together with a stopper 10 by screws 11 to open and close the suction hole 7 and allow fluid such as gas to flow only in the direction of arrow a in the figure. A reed valve type discharge valve 12 which opens and closes the discharge hole 8 and allows fluid to flow only in the direction of arrow b shown in the figure is provided on the upper surface of the valve seat 2 and is fastened together with a stopper 13 with a screw 14. ing.

Incidentally, the fitting portion A between the valve seat 2 and the partition wall 4 constitutes the slotted seal structure according to the present invention. That is, before the partition wall 4 is assembled, a slotted portion 4a is engaged with the lower end thereof as shown in FIG. 2a. On the other hand, a groove 15 is formed in the center of the upper surface of the valve seat 2 in a direction perpendicular to the plane of the drawing, and a wedge-shaped projection 16 that is long in the direction perpendicular to the plane of the drawing is provided at the center of the lower surface of the groove 15.

Then, the lower end of the partition wall 4 is fitted into the groove 15 formed in the valve seat 2, and the slotted portion 4a is engaged with the wedge-shaped projection 16, so that the second
If you press downward as shown by the arrow in figure a, the second
As shown in FIG. b, the slotted portion 4a expands due to the wedge action of the wedge-shaped projection 16, and both sides of the slotted portion 4a come into contact with both side surfaces 15a, 15a of the groove 15, so that the sealing structure with the slotted portion has good sealing performance. is maintained high. Furthermore, as shown in FIG.
Even if a gap δ is generated between the grooves 15 and 15, the depth h of the groove 15 is sufficient, so the lower end of the expanded partition wall 4 still contacts both side surfaces 15a, 15a of the groove 15. High sealing performance can always be obtained stably. This also means that even if the dimensional accuracy or attachment accuracy of the valve seat 2 and the partition wall 4 is somewhat poor, high sealing performance can be stably obtained.

Incidentally, in the above embodiment, the thickness of the partition wall 4 was kept constant as shown in FIG. The sealing performance of the slotted seal structure is further improved, and the partition wall 4 is also prevented from coming off. Further, although the above description has been made of an example in which the present invention is applied to a valve unit in particular, the present invention can be applied to any other equipment, parts, etc.

(Effect of the invention) As is clear from the above explanation, according to the present invention, the end of the seal part provided with the slotted part is fitted into the groove of the other seal part, and the slotted part is inserted into the groove of the other seal part. Since it is configured to engage with the wedge-shaped protrusion of the seal component, the slotted part expands due to the wedge action, and both sides thereof come into contact with the inner surface of the groove, resulting in the effect that high sealing performance can always be stably obtained. is obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a valve unit having a slotted seal structure according to the present invention, Fig. 2a,
b and c are cross-sectional views for explaining the assembly procedure and function of the slotted seal structure, FIG. 3 is a cross-sectional view showing a modified embodiment of the present invention, and FIG. 4 is a valve unit having a conventional seal structure. Longitudinal sectional view of 5th
The figure is a sectional view showing a conventional line contact type seal structure, and FIG. 6 is a sectional view showing a conventional fitting type seal structure. Explanation of symbols: 4a...Slit portion, 15...Concave groove, 16...Cuneiform projection.

Claims (1)

[Scope of utility model registration request] A slotted portion is provided at one end of the two seal components, and the other end is provided with a groove into which the end of one of the seal components is to be fitted, and the slotted portion is engaged with the slotted portion of the same seal component. A slotted seal structure characterized by a wedge-shaped projection that expands the section.