JPH0635730U - Pressure vessel sealing device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Increase in wall thickness of pressure vessel when using O-ring, and precision machining of pressure vessel joint when using sealing sheet, and cost due to precision assembly. To provide a high-performance pressure vessel sealing device which avoids increase. A seal ring mounting groove 9, 10 formed on an inner surface side of a wall of a pressure vessel along a joint portion of two joined portions and expanded toward an inner side of the vessel, and a seal ring having rubber elasticity And a seal ring 19 mounted in the mounting groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device for sealing a joint portion of a pressure vessel including at least two joint portions.

[0002]

[Prior art and its problems]

 Generally, in a pneumatic nailer driven by compressed air, the nailer housing functions as a pressure vessel. Conventionally, O-rings and sealing sheets (for example, asbestos joints) have been used as sealing means between the nailer housing and the housing cap that closes the upper end opening. When an O-ring is used, O-ring mounting grooves must be formed on both end surfaces of the joint between the nailer housing and the housing cap. It must be thick.

Further, when a sealing sheet is used, both end surfaces of the joint portion of the nailer housing and the housing cap are precisely machined so that the crushing margin of the sealing sheet is uniform, and if the sealing sheet is not precisely assembled, the air will be blown. This may cause leakage and deterioration of the sealing sheet.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to avoid an increase in wall thickness of a pressure vessel when using an O-ring, and precision processing of a joint portion of the pressure vessel when using a sealing sheet and an increase in cost due to precision assembly. , To provide a high performance pressure vessel sealing device.

[0005]

[Means for Solving the Problems]

 The present invention relates to a pressure vessel sealing device comprising at least two joined portions, which is formed on the inner surface side of the wall of the pressure vessel along the joining portion of the two joined portions and is directed toward the inside of the vessel. It consists of a widened seal ring mounting groove and a seal ring that has rubber elasticity and is mounted in the seal ring mounting groove.

[0006]

[Operation and effect of the device]

 Due to the pressure difference between the pressure fluid (for example, compressed air) enclosed in the pressure vessel and the atmosphere outside the pressure vessel, the seal ring comes into close contact with the wall of the seal ring mounting groove provided on the inner surface of the wall of the pressure vessel. The inside of the pressure vessel is sealed against the atmosphere. According to the pressure vessel sealing device of the present invention, the pressure vessel is sealed by the seal ring on the inner surface side of the pressure vessel by utilizing the pressure difference between the inside and the outside of the pressure vessel. There is no need to increase the wall thickness of the pressure vessel as in the case of sealing, and the precision processing and assembly of the pressure vessel as in the case of the sealing sheet are not required.

[0008]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 shows an embodiment in which the present invention is applied to a joint between a housing 1 and a housing cap 2 of a pneumatic nailer driven by compressed air. As shown in FIG. 1, a striking cylinder / piston mechanism 3 is built in and fixed to a nailing machine housing 1, and is compressed above a partition wall 5 provided on an outer peripheral surface of an intermediate portion of a striking cylinder 4. An air storage chamber 6 is formed. The compressed air storage chamber 6 functions as an accumulator that receives compressed air from an external compressed air source via an air plug (not shown). FIG. 1 is a schematic view showing a nailing machine housing 1 as a pressure vessel, and the compressed air storage chamber 6 is not shown in a sealed state, but is actually sealed. A blowback compressed air storage chamber 7 is formed below the partition wall 5.

The upper end portion 4 a of the striking cylinder 4 projects upward from the upper end opening portion 8 of the nailer housing 1 to accommodate the upper end portion 4 a and the head valve 11 above the upper end portion 4 a. It is assembled and fixed to the nailer housing 1. A cylindrical head valve casing 12 is formed so as to project downward from the ceiling wall of the housing cap 2. A head valve piston 13 is assembled in the head valve casing 12 so as to be vertically slidable. An O-ring 14 is fitted on the outer peripheral surface of the head valve piston 13 to slidably seal between the head valve piston 13 and the head valve casing 12. Therefore, the upper end of the housing cap 2 has an opening 15 communicating with the atmosphere, but the compressed air storage chamber 6 integrated with the portion around the upper end 4a of the striking cylinder 4 is closed to the atmosphere. There is.

At the joining portion between the housing cap 2 and the nailer housing 1, an inclined surface 9 is formed on the inner surface side of the lower end surface of the housing cap 2 over the entire circumference of the lower end portion of the housing cap 2. Also, on the inner surface side of the upper end opening 8 of the nail driver housing 1, an inclined surface 10 forming a pair with the inclined surface 9 is formed over the entire circumference of the upper end opening 8. On the outer peripheral edge of the inclined surface 10, a groove 16 having a substantially rectangular cross section is formed continuously with the inclined surface 10 over the entire circumference of the upper end opening 8. The annular flat end surface 17 formed continuously with the outer peripheral edge of the groove 16 is an annular flat end surface 18 formed continuously with the outer peripheral edge of the inclined surface 9 on the outer peripheral side of the inclined surface 9 of the housing cap 2. Abut. The pair of inclined surfaces 9 and 10 and the groove 16 form a seal ring mounting groove. A seal ring 19 made of a rubber molded product is mounted in the seal ring mounting groove. A seal ring 19 having a substantially isosceles triangular cross section is provided with a digging portion 20 having a rectangular cross section at the outermost peripheral portion. The biting portion 20 is mounted between the groove 16 and the flat end surface 18 with a slight crushing margin.

When high-pressure compressed air is introduced and stored in the compressed air storage chamber 6, the seal ring 19 is attached to the seal ring by the pressure difference between the compressed air pressure in the compressed air storage chamber 6 and the atmospheric pressure. It is strongly pressed against the inclined surfaces 9 and 10 of the groove to completely seal the joint portion between the nailer housing 1 and the housing cap 2. When the pneumatic nailing machine is not used and the pressure in the compressed air storage chamber 6 is atmospheric pressure, the rubber elasticity of the seal ring 19 and the crushing margin of the biting portion 20 work together to seal the seal ring 19. Prevent it from falling out of the mounting groove. Since the biting part 20 has a crushing margin, it is a short time until compressed air is introduced into the compressed air storage chamber 6 when the pneumatic nailing machine is used and the seal ring 19 comes into close contact with the inclined surfaces 9 and 10. Prevents compressed air from leaking into the atmosphere (initial leak) for an hour. In particular, when the pressure difference between the pressure in the compressed air storage chamber 6 and the atmospheric pressure is small, the sealing effect of the crushing margin of the digging portion 20 is large.

FIG. 2 shows a main part of a pressure vessel sealing device according to another embodiment of the present invention. A seal ring mounting groove having an isosceles triangular cross section is formed on the inner surface side of the joint between the nail driver housing 1 and the housing cap 2. The seal ring mounting groove is defined by an inclined surface 22 on the nailer housing 1 side and an inclined surface 23 on the housing cap 2 side. The seal ring 21 having the same cross-sectional shape as the seal ring mounting groove is strongly pressed against the inclined surfaces 22 and 23 by the compressed air introduced into the compressed air storage chamber 6 and the nail driver housing 1 and The joint portion with the housing cap 2 is completely sealed.

In the above embodiment, the seal ring mounting groove has an isosceles triangular cross section, but it may have a cross section of an appropriate shape such as a semicircle or a rectangle. INDUSTRIAL APPLICABILITY The present invention is effective not only in a pressure vessel including a nailing machine housing and a housing cap, but also in other pressure vessels, in particular, a pressure vessel in which a relatively low pressure fluid is sealed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pressure vessel sealing device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a pressure vessel sealing device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Nailer Housing (Pressure Vessel) 2 Housing Cap (Pressure Vessel) 9 Inclined Surface (Seal Ring Attachment Groove) 10 Inclined Surface (Seal Ring Attachment Groove) 16 Groove (Seal Ring Attachment Groove) 19 Seal Ring 21 Seal Ring 22 Inclination Surface (seal ring mounting groove) 23 Inclined surface (seal ring mounting groove)

Claims (1)

[Scope of utility model registration request] 1. A pressure vessel sealing device comprising at least two joined portions, wherein the pressure vessel sealing device is formed on the inner surface side of the wall of the pressure vessel along the joining portion of the two joined portions and expands toward the inside of the vessel. A pressure vessel sealing device comprising an opened seal ring mounting groove and a seal ring having rubber elasticity and mounted in the seal ring mounting groove.