Packing sealing structure and valve bearing seat

Abstract

The utility model belongs to the technical field of valve sealing, and discloses a packing sealing structure and a valve bearing seat. The packing sealing structure comprises a valve body, a packing sealing piece and a packing gland ring. The valve body is provided with an annular containing cavity, the cavity bottom of the annular containing cavity is arranged to be an inclined face, a communicating hole is formed in the middle of the cavity bottom of the annular containing cavity of the valve body, the communicating hole is used for allowing the valve rod to penetrate through, and the inclined face is arranged obliquely downwards in the direction from the circumferential side of the annular containing cavity to the middle of the annular containing cavity. The packing sealing piece is arranged in the annular containing cavity and surrounds the valve rod. The packing gland ring is arranged on the valve rod in a sleeving mode, a part of the packing gland ring extends into the annular containing cavity, and the packing gland ring is connected with the valve body and abuts against the packing sealing piece. According to the packing sealing structure, when the packing gland ring is connected with the valve body and abuts against the packing sealing piece, the packing gland ring can be tightly attached to the valve rod under the action of the inclined face, the sealing pressure between the packing sealing piece and the valve rod is increased, and the sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve sealing technical field especially relates to a packing seal structure and valve bearing seat. BACKGROUND

[0002] Flue gas flap valve leakage can cause harmful gas (such as SO2) to be discharged into the atmosphere, and further cause environmental pollution. In order to avoid flue gas flap valve leakage, the existing flue gas flap valve generally adopts a plurality of packing seal elements (such as packing) arranged in the annular receiving cavity of the valve body, and is extruded by a packing gland ring to make the packing seal element tightly fit the valve rod to achieve a sealing effect.

[0003] In the above structure, when the packing seal element is subjected to extrusion by the packing gland ring, the packing seal element expands radially to abut against and tightly fit the valve rod to achieve sealing. However, the existing packing seal element has a limited expansion amount, resulting in poor sealing effect. Moreover, after long-term use, the expansion amount of the packing seal element is further reduced, further affecting the sealing effect. Therefore, the packing seal element needs to be frequently replaced. SUMMARY

[0004] The utility model aims at providing a packing seal structure and valve bearing seat, which improves the sealing pressure between the packing seal element and the valve rod, and further improves the sealing effect.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The packing seal structure comprises:

[0007] The valve body is provided with an annular receiving cavity, the cavity bottom of the annular receiving cavity is provided as an inclined surface, and the valve body is provided with a communication hole in the middle of the cavity bottom of the annular receiving cavity, the communication hole is used for penetrating the valve rod, and the inclined surface is inclined downward from the direction of the middle of the annular receiving cavity to the side of the annular receiving cavity;

[0008] The packing seal element is arranged in the annular receiving cavity, and the packing seal element surrounds the valve rod;

[0009] The packing gland ring is sleeved on the valve rod, and a part of the packing gland ring extends into the annular receiving cavity, the packing gland is connected with the valve body and presses the packing seal element, and the packing seal element is tightly fitted with the valve rod.

[0010] As an optional solution, the valve body is provided with a first connecting part, the packing gland ring is provided with a second connecting part, and the first connecting part and the second connecting part are connected by a connecting piece

[0011] As an option, the end face of the packing gland ring extending into the annular receiving cavity is provided with a sharp corner, and the tip of the sharp corner abuts against the packing seal.

[0012] As an option, the distance between the inner wall surface of the packing gland ring and the tip of the sharp corner is a first distance H, and the distance between the outer wall surface of the packing gland ring and the tip of the sharp corner is a second distance G, and the first distance H is less than the second distance G.

[0013] As an option, the first distance H is set to 1 / 3 of the sum of the first distance H and the second distance G.

[0014] As an option, the included angle A between the first inclined surface of the sharp corner and the second inclined surface of the sharp corner is 100°-110°.

[0015] As an option, the included angle B between the inclined surface and the side wall surface of the annular receiving cavity is 120°-130°.

[0016] As an option, the outer wall surface of the valve body is further provided with a purge gas hole in communication with the annular receiving cavity, and the purge gas hole is used for communicating high-pressure gas, so that the high-pressure gas can enter the annular receiving cavity through the purge gas hole.

[0017] As an option, the inner wall surface of the communication hole is provided with a ring groove in communication with the cavity bottom of the annular receiving cavity, and the purge gas hole is in communication with the ring groove.

[0018] The valve bearing seat comprises a seat body, a bearing, a valve rod and the packing seal structure in any of the above options, the seat body is arranged on the valve body of the packing seal structure, the seat body is provided with a bearing mounting hole, the valve rod is arranged in the bearing mounting hole, and the bearing is arranged in the bearing mounting hole and sleeved on the valve rod.

[0019] The valve bearing seat has the following beneficial effects:

[0020] The packing seal structure provided by the utility model has the advantages that the cavity bottom of the annular receiving cavity is provided with an inclined surface inclined downward toward the valve rod direction, so that when the packing gland ring is connected with the valve body and presses the packing seal, the packing seal can be tightly combined with the valve rod under the action of the inclined surface, the sealing pressure between the packing seal and the valve rod is increased, and the sealing performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic view of the valve bearing seat provided by the utility model embodiment;

[0022] Figure 2 isFigure 1 Structure enlarged view at A in the figure.

[0023] Figure:

[0024] 1, valve body; 11, annular accommodating cavity; 111, inclined surface; 12, first connecting part; 13, purge hole; 14, annular groove; 2, packing seal; 3, packing gland ring; 31, second connecting part; 32, first inclined surface; 33, second inclined surface; 4, connecting piece;

[0025] 10, valve stem; 20, seat body; 30, bearing; 40, bearing cover; 50, skeleton oil seal. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be understood as a limitation of the present application.

[0027] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the description of the present application, unless explicitly defined and limited otherwise, the first feature "on" or "below" the second feature can include that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] The technical scheme of the present application is further illustrated below by combining the drawings and through the specific embodiments.

[0030] As Figures 1-2The utility model discloses an embodiment provides a kind of packing seal structure, including valve body 1, packing seal 2 and packing gland ring 3.Wherein, valve body 1 is provided with annular accommodating cavity 11, the cavity bottom of annular accommodating cavity 11 is set as inclined surface 111, and valve body 1 is provided with communicating hole in the middle part of the cavity bottom of annular accommodating cavity 11, communicating hole is used to wear valve stem 10, from the direction of the middle part of annular accommodating cavity 11 to the side of annular accommodating cavity 11, inclined surface 111 is inclined and set downward.Packing seal 2 is arranged in annular accommodating cavity 11, and packing seal 2 is arranged around valve stem 10.Packing gland ring 3 is sleeved on valve stem 10 and part of packing gland ring 3 is inserted into annular accommodating cavity 11, and packing gland ring 3 is connected with valve body 1 and presses packing seal 2, due to the effect of inclined surface 111, packing seal 2 has the force of moving towards valve stem 10, so that packing seal 2 can be closely attached with valve stem 10.

[0031] The packing seal structure is provided with inclined surface 111 inclined downward to the direction of valve stem 10 at the cavity bottom of annular accommodating cavity 11, so that packing gland ring 3 can be closely attached with valve stem 10 under the action of inclined surface 111 when being connected with valve body 1 and pressing packing seal 2, the sealing pressure between packing seal 2 and valve stem 10 is increased, and the sealing performance is improved.

[0032] Optionally, packing seal 2 can be selected as a multi-layer packing.

[0033] Specifically, the outer wall of valve body 1 is provided with a first connecting part 12, the outer wall of packing gland ring 3 is provided with a second connecting part 31, and the first connecting part 12 and the second connecting part 31 are connected by a connecting piece 4. In this structure, the connecting piece 4 is connected with the first connecting part 12 and the second connecting part 31 to realize the movement of the packing gland ring 3 towards the valve body 1 to press the packing seal 2.

[0034] Optionally, the connecting piece 4 can be selected as a plurality of screws, the first connecting part 12 can be provided with a plurality of threaded holes, the second connecting part 31 can be provided with a plurality of through holes corresponding to the threaded holes one by one, and the plurality of screws are respectively arranged in the plurality of through holes and screwed into the plurality of threaded holes.

[0035] The first connecting part 12 and the second connecting part 31 can both be annular structures, or the first connecting part 12 includes a plurality of first ear parts arranged in a ring on the outer wall of the valve body 1, and the second connecting part 31 includes a plurality of second ear parts arranged in a ring on the outer wall of the packing gland ring 3.

[0036] Optionally, the end face of the packing gland ring 3 extending into the annular accommodating cavity 11 is provided with a sharp corner, and the tip of the sharp corner can abut against the packing seal 2 when the packing gland ring 3 is connected with the valve body 1, which can reduce the contact area between the packing gland ring 3 and the packing seal 2 and improve the service life of the packing seal 2.

[0037] Optionally, the distance between the inner wall surface of the packing gland ring 3 and the tip of the sharp corner is a first distance H, and the distance between the outer wall surface of the packing gland ring 3 and the tip of the sharp corner is a second distance G. The first distance H is less than the second distance G. This structural design allows the tip of the sharp corner to be close to the valve stem 10. When the tip of the sharp corner presses against the packing seal 2, the end of the packing seal 2 near the sharp corner can have an inclined force toward the valve stem 10, further improving the sealing performance.

[0038] In this embodiment, the first distance H is 1 / 3 of the distance between the inner wall surface and the outer wall surface of the packing gland ring 3 (i.e., the sum of the first distance H and the second distance G). This structural design is reasonable, which makes the sealing performance of the packing seal 2 better.

[0039] In this embodiment, the included angle A between the first inclined surface 32 and the second inclined surface 33 of the sharp corner is 100°-110°. By setting this angle, the tip of the sharp corner is prevented from being too sharp and damaging the packing seal 2 when providing pressure, and it is not easy to wear, thereby improving the service life of the packing gland ring 3.

[0040] In this embodiment, the included angle B between the inclined surface 111 and the side wall of the annular receiving cavity 11 is 120°-130°. This angle setting makes the sealing effect of the packing seal 2 better.

[0041] Optionally, the outer wall of the valve body 1 is also provided with a purge air hole 13 that communicates with the annular receiving cavity 11. The purge air hole 13 is used to connect high-pressure gas. After long-term use, dust will accumulate in the annular receiving cavity 11. By passing high-pressure gas into the annular receiving cavity 11 through the purge air hole 13, the annular receiving cavity 11 can be purged to prevent dust from filling and corroding.

[0042] Specifically, the inner wall of the connecting hole is provided with an annular groove 14 that communicates with the bottom of the annular receiving cavity 11. When the valve stem 10 passes through the connecting hole, the annular groove 14 creates a gap between the valve stem 10 and a part of the connecting hole. By connecting the purge air hole 13 with the annular groove 14, the gap connects the annular receiving cavity 11 and the purge air hole 13 simultaneously. This structure enables high-pressure gas to be blown out through the bottom of the annular receiving cavity 11, further improving the purging effect.

[0043] This packing seal structure improves the sealing effect, reduces the contact area between the packing gland ring 3 and the packing seal 2, and prevents the valve body 1 from contacting the packing gland ring 3, thus avoiding corrosion. In addition, the addition of a purge vent 13 enables periodic purging and prevents dust accumulation.

[0044] Refer to Figure 1As shown, the utility model embodiment further provides a valve bearing seat, it includes seat body 20, bearing cover 40, bearing 30, valve stem 10 and above-mentioned packing seal structure, seat body 20 is set up on valve body 1 through screw, seat body 20 is provided with bearing mounting hole, valve stem 10 is arranged in bearing mounting hole, bearing 30 is arranged in bearing mounting hole and is set on valve stem 10, bearing cover 40 is connected with seat body 20 and is capped in bearing mounting hole.

[0045] Further, the bearing mounting hole is arranged at the end face of the seat body 20 away from the valve body 1, the hole bottom of the bearing mounting hole is provided with a through hole, the valve stem 10 is arranged in the through hole and extends into the bearing mounting hole; and the inner wall of the through hole is provided with a skeleton oil seal 50, the skeleton oil seal 50 and the inner wall of the valve stem 10 are rotationally attached.

[0046] Obviously, the above-mentioned embodiments of the utility model are only for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above-mentioned description. Here, all the embodiments are not exhausted. Any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A packing seal structure, characterized in that, include: The valve body (1) is provided with an annular receiving cavity (11). The bottom of the annular receiving cavity (11) is set as an inclined surface (111). The valve body (1) is provided with a connecting hole in the middle of the bottom of the annular receiving cavity (11). The connecting hole is used to pass through the valve stem (10). The inclined surface (111) is inclined downward from the periphery of the annular receiving cavity (11) towards the middle of the annular receiving cavity (11). A packing seal (2) is disposed within the annular receiving cavity (11), and the packing seal (2) is disposed around the valve stem (10); A packing gland ring (3) is fitted onto the valve stem (10), and a portion of the packing gland ring (3) extends into the annular receiving cavity (11). The packing gland ring (3) is connected to the valve body (1) and presses against the packing seal (2). The packing seal (2) is in contact with the valve stem (10).

2. The packing sealing structure according to claim 1, characterized in that, The valve body (1) is provided with a first connecting part (12), and the packing gland ring (3) is provided with a second connecting part (31). The first connecting part (12) and the second connecting part (31) are connected by a connector (4).

3. The packing seal structure according to claim 1, characterized in that, The end face of the packing gland ring (3) extending into the annular receiving cavity (11) is provided with a sharp corner, and the tip of the sharp corner abuts against the packing seal (2).

4. The packing seal structure according to claim 3, characterized in that, The distance between the inner wall surface of the packing gland ring (3) and the tip of the sharp corner is a first distance H, and the distance between the outer wall surface of the packing gland ring (3) and the tip of the sharp corner is a second distance G. The first distance H is less than the second distance G.

5. The packing seal structure according to claim 4, characterized in that, The first distance H is set to 1 / 3 of the sum of the first distance H and the second distance G.

6. The packing seal structure according to claim 3, characterized in that, The included angle A between the first inclined plane (32) and the second inclined plane (33) of the sharp angle is 100°-110°.

7. The packing seal structure according to claim 1, characterized in that, The included angle B between the inclined surface (111) and the side wall of the annular cavity (11) is 120°-130°.

8. The packing seal structure according to any one of claims 1-7, characterized in that, The outer wall of the valve body (1) is also provided with a purge air hole (13) that communicates with the annular accommodating cavity (11). The purge air hole (13) is used to connect high-pressure gas so that the high-pressure gas can enter the annular accommodating cavity (11) through the purge air hole (13).

9. The packing seal structure according to claim 8, characterized in that, The inner wall of the connecting hole is provided with an annular groove (14) that communicates with the bottom of the annular receiving cavity (11), and the purge air hole (13) communicates with the annular groove (14).

10. A valve bearing housing, characterized in that, The device includes a seat (20), a bearing (30), a valve stem (10), and a packing seal structure as described in any one of claims 1-9. The seat (20) is disposed on the valve body (1) of the packing seal structure. The seat (20) is provided with a bearing mounting hole. The valve stem (10) passes through the bearing mounting hole. The bearing (30) is disposed in the bearing mounting hole and sleeved on the valve stem (10).

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