Internal expansion type sealing plug

Abstract

The utility model belongs to the technical field of water tightness tests of furnace tubes, and particularly relates to an internal expansion type sealing plug. Comprising an outer plug, an inner plug, a hollow bolt, a nut and a sealing ring, the outer plug is movably arranged outside the hollow bolt in a sleeved mode, the inner plug is welded to one end of the hollow bolt, the sealing ring is arranged on the radial face of the inner plug in a sleeved mode, the nut is screwed on the hollow bolt, the outer plug is pushed to move towards one side of the inner plug, and therefore the sealing ring is extruded. The sealing ring is extruded outwards to be tightly attached to the inner wall of the furnace tube through the end face with the slope, and therefore the sealing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of furnace tube water tightness test technology, especially relates to a internal expansion type sealing plug. BACKGROUND

[0002] In the furnace tube production process, because the product design life is generally about 100,000 hours, so the product quality has very strict requirement, therefore, before the product leaves the factory, according to the requirement of customer, must carry out water tightness test to the product, and the highest test pressure can reach 30Mpa.

[0003] In the work of carrying out water tightness test to light wall furnace tube, the most difficult thing is the sealing problem, because it is only a light wall straight pipe, and there is no flange and other auxiliary parts as the sealing component, so it is difficult to achieve the sealing under the pressure of dozens of Mpa. UTILITY MODEL CONTENTS

[0004] The utility model discloses a internal expansion type sealing plug, for doing furnace tube water tightness test, need simultaneously use two sets of this internal expansion type sealing plug to seal the two end pipe orifices of furnace tube, utilize the end face with slope of self and extrude the sealing ring outward and tightly adhere to the inner wall of furnace tube, to reach the sealing effect.

[0005] In order to solve the above technical problems, the utility model provides a internal expansion type sealing plug, include: outer plug, inner plug, hollow core bolt, nut and sealing ring, the outer activity of hollow core bolt is equipped with outer plug, the inner plug is welded in one end of hollow core bolt, the sealing ring is sleeved on the radial surface of inner plug, is screwed on hollow core bolt through nut, and the outer plug is moved to the one side of inner plug to extrude the sealing ring.

[0006] Preferably, the outer plug includes: outer disc, shaft hole one, groove and slope face, the axial direction of outer disc is equipped with shaft hole one, is used for passing through hollow core bolt, the end face of outer disc is equipped with groove, and the groove is penetrated with shaft hole one, and the circumferential end face of outer disc also includes the slope face that sets up, is used for extruding the deformation of sealing ring in radial direction.

[0007] Preferably, the inner plug includes: inner disc, shaft hole two and step groove, the axial direction of inner disc is equipped with shaft hole two, is used for passing through hollow core bolt, and the radial end face of inner disc also includes the step groove that sets up, is used for installing sealing ring.

[0008] Preferably, the inner plug also includes the boss that cooperates with the groove.

[0009] Preferably, the end of the hollow bolt further includes an integrally formed welding portion, and the inner plug and the hollow bolt are fixedly welded by welding the welding portion to the end face of the inner plug.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] When the utility model is used, the nut is first loosened, the inner plug is completely placed in the furnace tube, and the nut is tightened to force the outer plug to press the sealing ring; while the outer plug presses the sealing ring, it uses its own sloped end face to squeeze the sealing ring outward and fit tightly against the inner wall of the furnace tube, thereby achieving a sealing effect; this internal expansion sealing plug can withstand a pressure of more than 30Mpa, has a simple structure, is easy to operate, and has reliable sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Fig. 1 This is a structural diagram of an internal expansion sealing plug of the utility model.

[0013] Fig. 2 It is a structural diagram of the outer plug of the utility model.

[0014] Fig. 3 It is a structural diagram of the inner plug of the utility model.

[0015] In the figure: 1-outer plug, 11-outer disc, 12-axis hole 1, 13-groove, 14-slope surface, 2-inner plug, 21-inner disc, 22-axis hole 2, 23-step groove, 24-boss, 3-hollow bolt, 31-welding part, 4-nut, 5-sealing ring. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0017] like Figs. 1-3 As shown, an embodiment of the utility model provides an internal expansion sealing plug, comprising: an outer plug 1, an inner plug 2, a hollow bolt 3, a nut 4 and a sealing ring 5; the outer movable sleeve of the hollow bolt 3 is provided with the outer plug 1, the inner plug 2 is welded to one end of the hollow bolt 3, the sealing ring 5 is sleeved on the radial surface of the inner plug 2, and is tightened on the hollow bolt 3 by the nut 4, and pushes the outer plug 1 to move toward the side of the inner plug 2 to achieve extrusion of the sealing ring 5.

[0018] The outer plug 1 includes: an outer disc 11, an axial hole 12, a groove 13 and a slope surface 14; an axial hole 12 is opened in the axial direction of the outer disc 11 for passing a hollow bolt, a groove 13 is opened on the end face of the outer disc 11, and the groove 13 and the axial hole 12 are penetrated, and the circumferential end face of the outer disc 11 also includes a slope surface 14, which is used to squeeze the sealing ring 5 to produce deformation in the radial direction to achieve a tighter seal between the sealing ring 5 and the inner wall of the furnace tube.

[0019] The inner plug 2 includes: an inner disc 21, a second axial hole 22 and a step groove 23; the inner disc 21 is provided with a second axial hole 22 in the axial direction for passing a hollow bolt, and the radial end surface of the inner disc 21 also includes a step groove 23 for installing a sealing ring 5. When the sealing ring 5 is placed on the step groove 23 of the inner plug 2, a seal that can withstand medium and high pressures is formed.

[0020] The inner plug 2 further includes a boss 24 that cooperates with the groove 13. When the outer plug 1 moves toward the inner plug 2, the boss 24 is located in the groove 13 to provide an escape space for the outer plug 1 to move.

[0021] The end of the hollow bolt 3 also includes an integrally formed welding portion 31, which is welded to the end face of the inner plug 2 to achieve fixed welding of the inner plug 2 and the hollow bolt, so that the hollow bolt 3 is fully welded to the inner plug 2.

[0022] When the utility model is used, the nut 4 is first loosened, the inner plug 2 is completely placed in the furnace tube, and the nut 4 is tightened to force the outer plug 1 to press the sealing ring 5; while the outer plug 1 presses the sealing ring 5, it uses its own sloped end surface to squeeze the sealing ring 5 outward to fit tightly against the inner wall of the furnace tube, thereby achieving a sealing effect.

[0023] The above description is only a description of the preferred embodiment of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An internal expansion sealing plug, characterized in that: include: An outer plug (1), an inner plug (2), a hollow bolt (3), a nut (4) and a sealing ring (5); the outer sleeve of the hollow bolt (3) is provided with the outer plug (1), the inner plug (2) is welded to one end of the hollow bolt (3), the sealing ring (5) is sleeved on the radial surface of the inner plug (2), is screwed onto the hollow bolt (3) by the nut (4), and pushes the outer plug (1) to move toward the side of the inner plug (2) to achieve the extrusion of the sealing ring (5).

2. The internal expansion sealing plug according to claim 1, characterized in that: The outer plug (1) comprises: an outer disc (11), an axial hole (12), a groove (13) and a slope surface (14); the outer disc (11) is provided with the axial hole (12) in the axial direction for passing the hollow bolt, the groove (13) is provided on the end surface of the outer disc (11), and the groove (13) and the axial hole (12) are interpenetrating, and the slope surface (14) is also provided on the circumferential end surface of the outer disc (11) for squeezing the sealing ring (5) to generate deformation in the radial direction.

3. The internal expansion sealing plug according to claim 2, characterized in that: The inner plug (2) comprises: an inner disc (21), a second axial hole (22) and a step groove (23); the second axial hole (22) is provided in the axial direction of the inner disc (21) for passing the hollow bolt, and the radial end surface of the inner disc (21) further comprises the step groove (23) for mounting the sealing ring (5).

4. An internal expansion sealing plug according to claim 3, characterized in that: The inner plug (2) further comprises a boss (24) that matches the groove (13).

5. The internal expansion sealing plug according to claim 1, characterized in that: The end of the hollow bolt (3) further comprises an integrally formed welding portion (31), and the inner plug (2) and the hollow bolt are fixedly welded by welding the welding portion (31) to the end surface of the inner plug (2).

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