High-pressure mechanical sealing device

Abstract

The utility model discloses a high-pressure mechanical sealing device which comprises an installation base, a sealing plug, a metal pressing bush and a locking nut. The mounting base is provided with a first communicating groove, a mounting groove and an external thread, the external thread is arranged on the outer side of the mounting groove, and the first communicating groove is communicated with the mounting groove; the sealing plug comprises an abutting part and a clamping part connected with the abutting part, the sealing plug is provided with a wire hole, and the wire hole penetrates through the abutting part and the clamping part; the metal pressing bush sleeves the clamping part, the locking nut is provided with a pressing groove, a second communicating groove and an internal thread, the pressing groove is communicated with the second communicating groove, and the internal thread is arranged on the side wall of the pressing groove. The fluororubber plug is simple to mount and dismount, and the fluororubber plug can be used repeatedly for many times in a real sense.

Description

TECHNICAL FIELD

[0001] The utility model relates to sealing technical field especially relates to a high pressure mechanical seal device. BACKGROUND

[0002] Various sensor leads are passed through the threading hole to the outside in the large equipment. In order to prevent the liquid or gas in the equipment from seeping and leaking, the sealing of the lead-out hole is mostly achieved by using ordinary gland head, glue pouring or packing seal. However, the above-mentioned methods have the following problems:

[0003] 1. When the sealing assembly with the structure of the gland head is screwed, the sealing rubber plug is subjected to the force in two degrees of freedom, i.e. the rotating force along the central axis and the pressing force. However, only the pressing force plays a role in the sealing of the lead. The rotating force will rotate the sealing rubber plug to a certain extent, thereby twisting the lead. Therefore, the rotating force is not conducive to the sealing effect and the protection of the lead.

[0004] 2. The sheath of the sensor lead is mostly made of Teflon, and the adhesion between Teflon and glue is very low. Under high pressure working condition, the sealing performance cannot be guaranteed.

[0005] 3. The packing seal has a large amount of work in the later maintenance, and the lead is easily damaged when the packing is removed.

[0006] Therefore, the prior art has defects and needs to be improved. INVENTION CONTENTS

[0007] The technical problem to be solved by the utility model is to provide a high pressure mechanical seal device to solve the problems pointed out in the background.

[0008] The technical scheme of the utility model is as follows: a high pressure mechanical seal device is provided, which comprises: a mounting base, a sealing plug, a metal pressing bushing and a locking nut; the mounting base is provided with a first communication groove and a mounting groove, and the first communication groove is in communication with the mounting groove; the sealing plug comprises: an abutting portion and a clamping portion connected with the abutting portion, and the sealing plug is provided with a wire hole passing through the abutting portion and the clamping portion; the metal pressing bushing covers the clamping portion, and the locking nut is provided with a pressing groove and a second communication groove, and the pressing groove is in communication with the second communication groove; the mounting groove is in butt joint with the pressing groove, the sealing plug is arranged in the mounting groove and the abutting portion is in abutment with the mounting groove, the metal pressing bushing is arranged in the pressing groove and in abutment with the pressing groove, and the mounting base and the locking nut are connected by threads. Preferably, the mounting base is provided with external threads, the external threads are arranged on the outside of the mounting groove, the locking nut is provided with internal threads, the internal threads are arranged on the side wall of the pressing groove, and the internal threads are matched with the external threads.

[0009] In assembly, the clamping part of the sealing plug is first assembled into the metal compression bushing, then the abutting part of the sealing plug is assembled into the mounting groove, then the inner thread is matched with the outer thread, then the cable is passed through the first communication groove, the wire hole and the second communication groove, and finally the locking nut is screwed, that is, the inner thread is further matched with the outer thread, so that the metal compression bushing extrudes the sealing plug, the wire hole is extruded and deformed, the cable is tightly clamped, and the sealing effect is achieved. Since the extrusion of the rubber plug is used to achieve the sealing effect, various technical problems caused by the glue sealing can be effectively avoided, and the glue can be fully used.

[0010] Further, the front end of the abutting part is a first inclined surface, the bottom surface of the mounting groove is provided with a second inclined surface, and the first inclined surface is matched with the second inclined surface. The matching of the first inclined surface and the second inclined surface can make the sealing plug receive a radial force in the extrusion process, extrude the wire hole, and better clamp the cable.

[0011] Further, the metal compression bushing comprises a bushing body and a bearing mounted at the tail end of the bushing body, the bushing body sleeves the clamping part, and the bearing abuts against the compression groove. The bearing can rotate together when the locking nut is tightened, but the bushing body and the sealing plug do not rotate, so that the sealing plug is prevented from being twisted and deformed.

[0012] Further, the bearing comprises a ball limiting ring sleeve, a plurality of balls arranged in the ball limiting ring sleeve and a rotating ring sleeve, the tail end of the bushing body is a limiting groove, the ball limiting ring sleeve and the rotating ring sleeve are located at the limiting groove, the balls abut against the side wall of the limiting groove and the rotating ring sleeve, and the rotating ring sleeve abuts against the compression groove. The bearing can better cooperate with the bushing body and reduce the volume.

[0013] Further, the clamping part abuts against the tail end of the bushing body.

[0014] Further, the mounting base is provided with a first wrench clamping part, and the locking nut is provided with a second wrench clamping part.

[0015] Further, the sealing plug is a fluororubber plug.

[0016] By adopting the above scheme, the high-pressure mechanical sealing device has the following technical effects:

[0017] The mounting and dismounting of the high-pressure mechanical sealing device are simple, and the fluororubber plug can be repeatedly used in a true sense.

[0018] The mounting and the later maintenance workload of the high-pressure mechanical sealing device are very low, the interchangeability of the fluororubber plug is high, the diameter of the wire hole of the fluororubber plug only needs to be changed if the diameter of the wire changes, the sealing requirement is ensured, and the use cost and the maintenance cost are reduced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0020] Figure 2 for Figure 1 Exploded view of the embodiment;

[0021] Figure 3 for Figure 1 Partial cross-sectional view of the embodiment. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Please see Figures 1-3 This embodiment provides a high-pressure mechanical seal device, including: a mounting base, a sealing plug, a metal clamping bushing, and a locking nut; the mounting base is provided with a first connecting groove 10, a mounting groove 11, and an external thread 12, the external thread 12 being disposed outside the mounting groove 11, and the first connecting groove 10 communicating with the mounting groove 11; the sealing plug includes: an abutment portion 13, a clamping portion 14 connected to the abutment portion 13, and the sealing plug is provided with a wire hole 17, the wire hole 17 passing through the abutment portion 13 and the clamping portion 14; the metal... A clamping bushing covers the clamping part 14. The locking nut is provided with a clamping groove 15, a second connecting groove 16, and an internal thread 18. The clamping groove 15 communicates with the second connecting groove 16, and the internal thread 18 is provided on the side wall of the clamping groove 15. The mounting groove 11 mates with the clamping groove 15. The sealing plug is installed in the mounting groove 11, and the abutting part 13 abuts against the mounting groove 11. The metal clamping bushing is disposed in the clamping groove 15 and abuts against the clamping groove 15. The internal thread 18 mates with the external thread 12. The sealing plug is a fluororubber plug.

[0024] During assembly, first, insert the clamping part 14 of the sealing plug into the metal pressure bushing, then insert the abutting part 13 of the sealing plug into the mounting groove 11. Next, mate the internal thread 18 with the external thread 12. Then, pass the cable through the first connecting groove 10, the wire hole 17, and the second connecting groove 16. Finally, tighten the lock nut, further mate the internal thread 18 with the external thread 12, causing the metal pressure bushing to compress the sealing plug and deform the wire hole 17, thereby tightly clamping the cable and achieving a sealing effect. Because the sealing effect is achieved by compressing the rubber plug, various technical problems caused by using potting sealant can be effectively avoided, making it convenient and easy to use.

[0025] In the embodiment, the front end of the abutting portion 13 is a first inclined surface 19, the bottom surface of the mounting groove 11 is provided with a second inclined surface 20, and the first inclined surface 19 cooperates with the second inclined surface 20. The cooperation of the first inclined surface 19 and the second inclined surface 20 can enable the sealing plug to be subjected to a radial force in the process of extrusion, extrude the wire hole 17, and thus better clamp the cable.

[0026] In the embodiment, the metal compression bushing comprises a bushing body 21 and a bearing mounted at the tail end of the bushing body 21. The bushing body 21 covers the clamping portion 14, and the bearing abuts against the compression groove 15. When the lock nut is tightened, the bearing can rotate together, but the bushing body 21 and the sealing plug do not rotate, thereby avoiding the deformation of the sealing plug.

[0027] In the embodiment, the bearing comprises a ball limiting ring 22, a plurality of balls 23 arranged in the ball limiting ring 22, and a rotating ring 24. The tail end of the bushing body 21 is a limiting groove, the ball limiting ring 22 and the rotating ring 24 are arranged at the limiting groove, the balls 23 abut against the side wall of the limiting groove and the rotating ring 24, and the rotating ring 24 abuts against the compression groove 15. The bearing can better cooperate with the bushing body 21 and reduce the volume.

[0028] In the embodiment, the clamping portion 14 abuts against the tail end of the bushing body 21.

[0029] In the embodiment, the mounting base is provided with a first wrench clamping portion 25, and the lock nut is provided with a second wrench clamping portion 26.

[0030] In summary, the high-pressure mechanical sealing device has the following technical effects.

[0031] The sealing device is simple to install and disassemble, and the fluororubber plug can be repeatedly used in a true sense.

[0032] The sealing device is simple to install and disassemble, and the fluororubber plug can be repeatedly used in a true sense.

[0033] The above is only a preferred embodiment of the utility model, and is not used for limiting the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-pressure mechanical seal device, characterized in that, include: Mounting base, sealing plug, metal clamping bushing, lock nut; The mounting base is provided with a first connecting groove and a mounting groove, the first connecting groove communicating with the mounting groove; the sealing plug includes: an abutting part and a clamping part connected to the abutting part, the sealing plug being provided with a wire hole, the wire hole passing through the abutting part and the clamping part; a metal clamping bushing is fitted over the clamping part, the locking nut is provided with a clamping groove and a second connecting groove, the clamping groove communicating with the second connecting groove; the mounting groove is aligned with the clamping groove, the sealing plug is inserted into the mounting groove and the abutting part abuts against the mounting groove, the metal clamping bushing is disposed in the clamping groove and abuts against the clamping groove, and the mounting base and the locking nut are connected by threads.

2. The high-pressure mechanical seal device according to claim 1, characterized in that, The front end of the abutment part is a first inclined surface, and the bottom surface of the mounting groove is provided with a second inclined surface, and the first inclined surface and the second inclined surface cooperate with each other.

3. The high-pressure mechanical seal device according to claim 1, characterized in that, The metal clamping bushing includes: a bushing body and a bearing installed at the tail end of the bushing body; the bushing body covers the clamping part, and the bearing abuts against the clamping groove.

4. A high-pressure mechanical seal device according to claim 3, characterized in that, The bearing includes: a ball retaining ring sleeve, a plurality of balls disposed within the ball retaining ring sleeve, and a rotating ring sleeve; the tail end of the bushing body is a limiting groove, the ball retaining ring sleeve and the rotating ring sleeve are located in the limiting groove, the balls abut against the side wall of the limiting groove and the rotating ring sleeve, and the rotating ring sleeve abuts against the clamping groove.

5. A high-pressure mechanical seal device according to claim 4, characterized in that, The clamping part abuts against the tail end of the bushing body.

6. A high-pressure mechanical seal device according to claim 1, characterized in that, The mounting base is provided with a first wrench clamping part, and the locking nut is provided with a second wrench clamping part.

7. A high-pressure mechanical seal device according to any one of claims 1-6, characterized in that, The sealing plug is a fluororubber plug.

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