Corrugated pipe mechanical seal

Abstract

The utility model discloses a corrugated pipe mechanical seal which comprises a connecting base disc, a corrugated pipe section is arranged in the middle of the upper end of the connecting base disc, a fixing ring is arranged at the upper end of the corrugated pipe section, a plurality of evenly-distributed clamping plates are arranged on the top of the fixing ring in the radial direction, and sliding grooves are formed in the inner sides of the upper portions of the clamping plates. A pin block is arranged on the inner side of the sliding groove in a matched and telescopic mode, a first spring with one end connected to the pin block and the other end fixedly connected to the inner end of the sliding groove is further arranged on the inner side of the sliding groove, a first magnetic block is arranged at the outer end of the pin block, a movable ring is further sleeved with the fixed ring in a matched mode, and a plurality of clamping grooves vertically corresponding to the clamping plates are formed in the circumference of the movable ring. When a large shaft swing phenomenon occurs, due to the fact that the annular plate can form reverse pushing on the rubber ring under the action of the second spring, the sealing face on the other side of the rubber ring is synchronously matched with the movable ring, and therefore a sealing gap possibly occurring due to shaft swing is effectively prevented, and the sealing effect is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a bellows mechanical seal. Background Art

[0002] Metal bellows mechanical seal is a welding technology which is mainly used for the shaft seal of hot oil pump in oil refinery. It is mainly used to compensate for pipeline thermal deformation, shock absorption, and absorption of pipeline settlement deformation. It is widely used in petrochemical, instrumentation, aerospace, chemical, electric power, water conservancy, metallurgy and other industries.

[0003] The patent document with the announcement number CN219866275U discloses a bellows for mechanical seal, which has the following beneficial effects: when the worn rubber ring needs to be replaced, we can first press the limiting plate on one side of the clamping plate, so that the movable ring can clamp and fix the rubber ring on the top of the fixed ring, thereby completing the replacement of the worn rubber ring, solving the problem that the existing bellows for mechanical seal are inconvenient to maintain and replace the worn rubber ring

[0004] In actual use, since the dynamic ring / active ring of the mechanical seal are tightly installed on the pump casing, the limit plate in the device protrudes from the outer peripheral side of the active ring after installation. Therefore, when continuous shaft movement occurs, it is easy for the limit plate to break free from the restraint of the spring and slip out of the receiving groove or retract into the receiving groove, so that the active ring is separated from the clamping plate and the fixed ring, and there is no obvious snap-on limit structure between the inner end of the limit plate and the receiving groove. In addition, since there are only two opposing locking mechanisms between the movable ring and the fixed ring, a sealing gap may appear between the rubber ring and the movable ring when the shaft swings. Therefore, although the bellows mechanical seal can realize the convenient replacement of the rubber ring, it needs to be improved in terms of practicality and stability of use. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] Therefore, the purpose of the utility model is to provide a bellows mechanical seal to solve the problem that the bellows mechanical seal in the prior art proposed in the above background technology can realize the convenient replacement of the rubber ring, but needs to be improved in terms of practicality and stability of use.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bellows mechanical seal, which includes a connecting base plate, a bellows section is provided at the center of the upper end of the connecting base plate, a fixing ring is provided at the upper end of the bellows section, a plurality of evenly distributed card plates are arranged in a radial circle on the top of the fixing ring, a slide groove is provided on the inner side of the upper part of the card plate, a pin block is matched and telescopically arranged on the inner side of the slide groove, a spring is also arranged on the inner side of the slide groove, one end of the spring is connected to the pin block and the other end is fixed to the inner end of the slide groove, the outer end of the pin block is provided with a first magnetic block, and a movable ring is also provided with the fixing ring sleeve to match, a plurality of card grooves corresponding to the card plate are arranged on a circle around the movable ring, the upper side of the card groove is provided with a bracket groove matching the pin block, the inner end of the bracket groove is also provided with a second magnetic block magnetically attracted to the first magnetic block, the outer edge of the shaft hole on the upper part of the fixing ring is also provided with an annular positioning groove, and a rubber ring is embedded and installed on the inner side and the upper part of the annular positioning groove.

[0008] As a preferred solution of the bellows mechanical seal described in the utility model, the clamping plate and the clamping groove form a buckling group, and the buckling group is no less than three.

[0009] As a preferred solution of the bellows mechanical seal described in the utility model, the upper part of the bracket groove passes through the top of the movable ring, and a buckle plate slightly higher than the top of the movable ring is fixed to the top of the outer end of the pin block.

[0010] As a preferred solution of the bellows mechanical seal described in the utility model, an elastic pressing piece for pushing the rubber ring upward is also provided at the lower inner part of the annular positioning groove.

[0011] As a preferred solution of a bellows mechanical seal described in the utility model, the elastic top pressure piece includes a plurality of springs 2 vertically distributed in a circle at the bottom of the annular positioning groove, and an annular plate fixed to the top of the spring 2 and the upper part of which is in contact with the bottom of the rubber ring.

[0012] As a preferred solution of a bellows mechanical seal described in the utility model, a fixing plate is also matched at the bottom of the connecting base plate, a plurality of threaded holes are arranged around the connecting base plate, and screw holes corresponding to the threaded holes are arranged on the fixing plate, fixing bolts are connected between the connecting base plate and the fixing plate through the threaded holes and the screw holes, and a plurality of through holes are also arranged around the outer circumference of the fixing plate.

[0013] Compared with the prior art, the beneficial effect of the utility model is that when the worn rubber ring of this bellows mechanical seal needs to be replaced, the buckle plate can be directly pushed to drive the pin block to retract into the inside of the card plate, so that the pin block can be smoothly separated from the card bracket groove and the card slot, so that the movable ring and the fixed ring are separated from each other, thereby facilitating the rapid disassembly and replacement of the rubber ring. During installation, the pin block is first pressed and inserted into the card slot, and then pressed together so that the outer end of the pin block is directly pushed into the inner side of the card bracket groove. In this way, the spring can firmly press the pin block against the inner side of the card bracket groove. At the same time, under the close attraction of the first magnetic block and the second magnetic block, the card plate can be very stably locked on the circumferential side of the movable ring, effectively avoiding the disadvantage that the movable ring and the fixed ring are easily separated when continuous shaft movement occurs, so that the practicality and stability of use of the mechanical seal are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the card board of the utility model;

[0016] Figure 3 This is a schematic diagram of the card slot structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the elastic top pressure piece of the utility model.

[0018] In the figure: connecting base plate; 1001, threaded hole; 110, bellows section; 120, fixing ring; 1201, annular positioning groove; 130, clamping plate; 1301, slide groove; 131, pin block; 132, spring one; 133, first magnetic block; 134, buckle plate; 140, elastic top pressure piece; 1401, spring two; 1402, annular plate; 200, movable ring; 2001, clamping groove; 2002, bracket groove; 210, second magnetic block; 300, rubber ring; 400, fixing plate; 4001, through hole; 500, fixing bolt. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1-Figure 4 The figure shows the overall structure of a bellows mechanical seal of the utility model. Figure 1-Figure 4 A bellows mechanical seal of the present embodiment includes a connecting base plate 100, a bellows section 110 is provided at the center of the upper end of the connecting base plate 100, a fixing ring 120 is provided at the upper end of the bellows section 110, a plurality of evenly distributed clamping plates 130 are provided in a radial circle on the top of the fixing ring 120, a slide groove 1301 is provided on the inner side of the upper part of the clamping plate 130, a pin block 131 is matched and telescopically provided on the inner side of the slide groove 1301, a spring 132 is also provided on the inner side of the slide groove 1301, one end of which is connected to the pin block 131 and the other end is fixed to the inner end of the slide groove 1301, and the pin block 13 The outer end of the movable ring 200 is provided with a first magnetic block 133, and the movable ring 200 is sleeved and matched with the fixed ring 120. A plurality of card slots 2001 corresponding to the card plate 130 are arranged around the movable ring 200. A card holder slot 2002 is provided on one side of the upper part of the card slot 2001 to match the pin block 131. The inner end of the card holder slot 2002 is also provided with a second magnetic block 210 magnetically attracted to the first magnetic block 133. The outer edge of the upper shaft hole of the fixed ring 120 is also provided with an annular positioning groove 1201. A rubber ring 300 is embedded and installed inside and on the upper part of the annular positioning groove 1201.

[0023] The clamping plate 130 and the clamping slot 2001 form a snap-fit ​​group, and the number of the snap-fit ​​groups is no less than three. In the present embodiment, at least three connecting locking parts are provided between the fixed ring 120 and the movable ring 200. Since the triangle has the characteristic of good stability, the problem of a sealing gap between the rubber ring 300 and the movable ring 200 when the shaft swings can be effectively prevented, thereby ensuring the airtightness and stability of the shaft seal.

[0024] The upper part of the bracket slot 2002 passes through the top of the movable ring 200, and a buckle plate 134 slightly higher than the top of the movable ring 200 is fixed to the top of the outer end of the pin block 131. In this embodiment, when the worn rubber ring 300 needs to be replaced, the buckle plate 134 can be directly pushed to drive the pin block 131 to retract into the inside of the card plate 130, so that the pin block 131 can be smoothly separated from the bracket slot 2002 and the card slot 201, so that the movable ring 200 and the fixed ring 120 are separated from each other, thereby facilitating the rapid disassembly and replacement of the rubber ring 300. When installing, first press the pin block 131 and Insert it into the card slot 2001 and continue to press it so that the outer end of the pin block 131 is directly pushed into the inner side of the card bracket slot 2002. In this way, the spring 132 can firmly press the pin block 131 against the inner side of the card bracket slot 2002. At the same time, under the tight attraction of the first magnetic block 133 and the second magnetic block 210, the card plate 130 can be very stably locked on the side of the movable ring 200, effectively avoiding the disadvantage that the movable ring 200 and the fixed ring 120 are easily separated when continuous shaft movement occurs, so that the practicality and stability of the mechanical seal are further improved.

[0025] The lower inner part of the annular positioning groove 1201 is also provided with an elastic pressing member 140 for pushing the rubber ring 300 upwards; the elastic pressing member 140 includes a plurality of springs 1401 vertically distributed in a circle at the bottom of the annular positioning groove 1201, and an annular plate 1402 fixed to the top of the springs 1401 and the upper part of which is in contact with the bottom of the rubber ring 300. In actual use, in order to make the rubber ring 300 fit tightly with the movable ring 200, when a large shaft swing occurs, the annular plate 1402 can push the rubber ring 300 in the opposite direction under the action of the springs 1401, so that the sealing surface on the other side of the rubber ring 300 and the movable ring 200 form a synchronous match, thereby effectively preventing the sealing gap that may occur due to the shaft swing, and the sealing effect is further guaranteed.

[0026] A fixing plate 400 is also matched at the bottom of the connecting base plate 100. A plurality of threaded holes 1001 are arranged around the connecting base plate 100, and screw holes corresponding to the threaded holes 1001 are arranged on the fixing plate 400. Fixing bolts 500 are connected between the connecting base plate 100 and the fixing plate 400 through the threaded holes 1001 and the screw holes. A plurality of through holes 4001 are also arranged around the outer circumference of the fixing plate 400. It can be understood that the fixing plate 400 can be installed and positioned between the pump casing through the cooperation of the through holes 4001 and the bolts or pins. At the same time, the fixing plate 400 and the connecting base plate 100 are also matched and fixedly connected, so that the bellows mechanical seal forms a complete connection mechanism. This is a common technical means in this field and will not be explained in detail.

[0027] In summary, in a bellows mechanical seal of the present embodiment, when the worn rubber ring 300 needs to be replaced, the buckle plate 134 can be directly pushed to drive the pin block 131 to retract into the inside of the card plate 130, so that the pin block 131 can be smoothly separated from the card bracket groove 2002 and the card groove 2001, so that the movable ring 200 and the fixed ring 120 are separated from each other, thereby facilitating the rapid disassembly and replacement of the rubber ring 300. During installation, the pin block 131 is first pressed and inserted into the card groove 2001, and then pressed together so that the outer end of the pin block 131 is directly pushed into the inner side of the card bracket groove 2002. In this way, the spring 132 can firmly press the pin block 131 against the inner side of the card bracket groove 2002. At the same time, under the close attraction of the first magnetic block 133 and the second magnetic block 210, the card plate 130 can be very stably locked on the peripheral side of the movable ring 200, effectively avoiding the disadvantage that the movable ring 200 and the fixed ring 120 are easily separated when continuous shaft movement occurs.

[0028] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bellows mechanical seal, characterized in that: The invention comprises a connecting base plate (100), wherein a bellows section (110) is provided at the center of the upper end of the connecting base plate (100), wherein the upper end of the bellows section (110) is provided with a fixing ring (120), wherein a plurality of evenly distributed clamping plates (130) are provided in a radial circle at the top of the fixing ring (120), wherein the upper inner side of the clamping plate (130) is provided with a slide groove (1301), wherein the inner side of the slide groove (1301) is matched with a pin block (131) for telescopic movement, wherein the inner side of the slide groove (1301) is further provided with a spring (132) having one end connected to the pin block (131) and the other end fixed to the inner end of the slide groove (1301), wherein the outer end of the pin block (131) is provided with a first magnetic The movable ring (200) is sleeved and matched with the fixed ring (120), and a plurality of slots (2001) perpendicularly corresponding to the card plate (130) are arranged around the movable ring (200), and a card holder slot (2002) matching with the pin block (131) is provided on one side of the upper part of the card holder slot (2001), and a second magnetic block (210) magnetically attracted to the first magnetic block (133) is also provided at the inner end of the card holder slot (2002), and an annular positioning groove (1201) is also provided around the outer edge of the upper shaft hole of the fixed ring (120), and a rubber ring (300) is embedded and installed on the inner side and upper part of the annular positioning groove (1201).

2. A bellows mechanical seal according to claim 1, characterized in that: The card plate (130) and the card slot (2001) form a buckling group, and the buckling group includes no less than three.

3. A bellows mechanical seal according to claim 1, characterized in that: The upper portion of the card holder slot (2002) passes through the top of the movable ring (200), and a buckle plate (134) slightly higher than the top of the movable ring (200) is fixed to the top of the outer end of the pin block (131).

4. A bellows mechanical seal according to claim 1, characterized in that: An elastic pressing piece (140) for pushing the rubber ring (300) upwards is also provided at the lower inner portion of the annular positioning groove (1201).

5. A bellows mechanical seal according to claim 4, characterized in that: The elastic pressing member (140) comprises a plurality of springs (1401) vertically distributed in a circle at the bottom of the annular positioning groove (1201), and an annular plate (1402) fixed to the top of the spring (1401) and having its upper portion abutting against the bottom of the rubber ring (300).

6. A bellows mechanical seal according to claim 1, characterized in that: The bottom of the connection base (100) is also matched with a fixing plate (400), the connection base (100) is provided with a plurality of threaded holes (1001) in a circumferential direction, and the fixing plate (400) has screw holes corresponding to the threaded holes (1001), the connection base (100) and the fixing plate (400) are connected by fixing bolts (500) via the threaded holes (1001) and the screw holes, and the outer circumference of the fixing plate (400) is also provided with a plurality of through holes (4001).

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