Automatic compensation type packing sealing structure

Abstract

The utility model relates to an automatic compensation type packing sealing structure which comprises a shaft, a shaft sleeve, a packing box body, a packing ring, packing, a packing gland, a stud, an elastic element and a fixed pressing piece. The stuffing box body is provided with an annular groove for installing the stuffing ring and the stuffing, the stuffing ring and the stuffing are arranged between the annular groove of the stuffing box body and the shaft sleeve, the section of the stuffing gland is in an L shape, the end, close to the stuffing box body, of the stuffing gland is embedded in the stuffing box body and makes contact with the stuffing, and the other end of the stuffing gland is provided with a through hole. A threaded hole is designed in the stuffing box body, and one end of the stud penetrates through a through hole in the stuffing gland and is screwed in a thread on the stuffing box body; the other end of the stud is sleeved with an elastic element which is pressed on the packing gland through a fixing and pressing piece. After the surface of the packing is abraded in the operation process, the elastic element can automatically release elastic force, the elastic force is evenly applied to the packing gland, the packing gland is pressed, and a better sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to a packing sealing structure, in particular to an automatic compensation packing sealing structure which solves the problem of stopping a pump and re-tightening a packing gland due to packing wear, thereby greatly reducing the subsequent maintenance cost. Background Art

[0002] In the field of fluid machinery, sealing systems play a key role in preventing leakage of media. Currently, the most common sealing systems include packing seals, mechanical seals, dynamic seals and floating seals.

[0003] At present, mechanical seals are the most common and have the best sealing effect, but they can only be used in situations where clean water or similar clean water media are used, and they have a complex structure and high cost.

[0004] Dynamic seals require power from a prime mover to achieve a sealing effect, which will increase power by about 5%-10%. They will not be able to achieve a sealing effect after shutdown.

[0005] The floating seal relies on the narrow gap between the shaft and the floating ring to generate a large hydraulic resistance to achieve sealing. Like the dynamic seal, it cannot achieve the sealing effect after shutdown.

[0006] A packing seal is a system where packing is inserted into a stuffing box and compressed with a gland. The seal is achieved by the cylindrical surface of the shaft or sleeve against the inner surface of the packing. Materials used include ramie, rubber asbestos, oil-impregnated asbestos, and polytetrafluoroethylene. While packing seals are simple to manufacture and easy to assemble and disassemble, they lack automatic compensating sealing, requiring frequent maintenance and resulting in high costs and significant disruption to customer production processes. Utility Model Content

[0007] In view of the above problems, the main purpose of the present invention is to provide an automatic compensation packing seal structure which solves the problem of stopping the pump and re-tightening the packing gland due to packing wear, thereby greatly reducing the subsequent maintenance costs.

[0008] The utility model solves the above technical problems through the following scheme: an automatic compensation type packing sealing structure, the automatic compensation type packing sealing structure includes: a shaft, a sleeve, a stuffing box body, a packing ring, a packing, a packing cover, a stud, an elastic element, and a fixed pressing piece; the sleeve is sleeved on the shaft, and the stuffing box body is provided with an annular groove for installing the packing ring and the packing, the packing ring and the packing are arranged between the annular groove of the stuffing box body and the sleeve, the packing cover is a cover with an "L"-shaped cross-section, and the end of the packing cover close to the stuffing box body is embedded in the stuffing box body and contacts with the packing, the other end of the packing cover is designed with a through hole, and the stuffing box body is designed with a threaded hole, one end of the stud passes through the through hole on the packing cover and is screwed into the thread on the stuffing box body; the other end of the stud is sleeved with an elastic element, and the elastic element is pressed on the packing cover by a fixed pressing piece.

[0009] In a specific implementation example of the present invention, the elastic element is a coil spring, a butterfly spring or a bellows.

[0010] In a specific implementation example of the present invention, washers are installed at both ends of the elastic element.

[0011] In a specific implementation example of the present invention, a keyway is designed on the shaft, and a key is installed in the keyway.

[0012] In a specific implementation example of the present invention, a threaded hole is designed on the shaft sleeve, and a screw is provided in the threaded hole to press against the shaft to prevent the shaft sleeve from moving.

[0013] In a specific implementation example of the present invention, the fixing and pressing member is a nut, and two nuts are provided.

[0014] In a specific implementation example of the present invention, a flushing interface is designed on the stuffing box body, and the flushing interface is aligned with the stuffing ring.

[0015] In a specific implementation example of the present invention, a plurality of fillers are installed in the stuffing box body.

[0016] The positive improvement of this utility model lies in that, compared with common similar technologies, the automatic compensating packing seal structure provided by this utility model automatically releases its elastic force when the packing surface wears during operation, evenly applying force to the packing gland, tightening the packing gland and achieving a better sealing effect. This solves the problem of needing to stop the pump and re-tighten the packing gland due to packing wear, greatly reducing subsequent maintenance costs and minimizing the impact on the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a structural diagram of an implementation example of the present invention.

[0018] Figure 2This is a structural diagram of another embodiment of the present invention.

[0019] The following are the names corresponding to the bid numbers in this utility model:

[0020] Shaft 1, sleeve 2, stuffing box body 3, packing ring 4, packing 5, packing gland 6, stud 7, washer 8, screw 9, elastic element 10, fixing and pressing part 11, flushing interface 12, key 13. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0022] Figure 1 This is a structural diagram of an embodiment of the present invention, as shown in FIG. Figure 1 As shown: An automatic compensation type packing seal structure proposed by the present invention includes: a shaft 1, a sleeve 2, a stuffing box body 3, a packing ring 4, a packing 5, a packing gland 6, a stud 7, an elastic element 10, and a fixed pressing part 11.

[0023] The shaft sleeve 2 is sleeved on the shaft 1, and the stuffing box body 3 is provided with an annular groove for installing the packing ring 4 and the packing 5. The packing ring 4 and the packing 5 are arranged between the annular groove of the stuffing box body 3 and the shaft sleeve 2. The stuffing cover 6 is a cover with an "L"-shaped cross-section. The end of the stuffing cover 6 close to the stuffing box body 3 is embedded in the stuffing box body and contacts with the packing 5. A through hole is designed on the other end of the stuffing cover 6, and a threaded hole is designed on the stuffing box body 3. One end of the stud 7 passes through the through hole on the stuffing cover 6 and is screwed into the thread on the stuffing box body 3; the other end of the stud 7 is sleeved with an elastic element 10, and the elastic element 10 is pressed on the stuffing cover 6 with a fixed pressing piece 11.

[0024] The elastic element 10 in this invention is a coil spring, butterfly spring, or bellows, with washers 8 mounted on both ends. The shaft 1 is designed with a keyway, in which a key 13 is installed. The sleeve 2 is designed with a threaded hole, in which a screw 9 is installed to prevent the sleeve from moving. The fixing and holding member 11 in this invention is a nut, and two nuts are provided. The stuffing box body 3 in this invention is designed with a flushing port 12, which is aligned with the packing ring 4. The stuffing box body in this invention contains multiple packings.

[0025] Two washers 8 are installed, on both sides of the elastic element, one flat washer leans against the packing gland and the other leans against the nut, which is used to increase the force-bearing area, and the elastic force of the elastic element is evenly pressed on the packing gland; two nuts are designed to prevent the nuts from loosening during operation.

[0026] In this new design, if the packing surface wears during operation, the elastic element automatically releases its force, evenly applying force to the packing gland, tightening it and achieving a better seal. This eliminates the need to stop the pump and re-tighten the packing gland due to packing wear, significantly reducing subsequent maintenance costs and minimizing the impact on the customer's production process.

[0027] Figure 2 This is a structural diagram of another embodiment of the present invention, as shown in FIG. Figure 2 As shown, Figure 2 Installing the elastic element 10 inside the stuffing box can also achieve an automatic compensation effect.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrative purposes. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements shall fall within the scope of the present invention as claimed, and the scope of protection claimed by the present invention shall be defined by the appended claims and their equivalents.

Claims

1. An automatic compensation type packing seal structure, characterized by: The automatic compensation type packing seal structure includes: a shaft, a sleeve, a stuffing box body, a packing ring, a packing, a packing gland, a stud, an elastic element, and a fixed pressing piece; the sleeve is sleeved on the shaft, and the stuffing box body is provided with an annular groove for installing the packing ring and the packing, and the packing ring and the packing are arranged between the annular groove of the stuffing box body and the sleeve; the packing gland is a gland with an "L"-shaped cross-section, and the end of the packing gland close to the stuffing box body is embedded in the stuffing box body and contacts the packing, and the other end of the packing gland is designed with a through hole, and the stuffing box body is designed with a threaded hole, one end of the stud passes through the through hole on the packing gland and is screwed into the thread on the stuffing box body; the other end of the stud is sleeved with an elastic element, and the elastic element is pressed on the packing gland by a fixed pressing piece.

2. The automatic compensation type packing seal structure according to claim 1, characterized in that: The elastic element is a coil spring, a butterfly spring or a bellows.

3. The automatic compensation type packing seal structure according to claim 1 or 2, characterized in that: Washers are installed at both ends of the elastic element.

4. The automatic compensation type packing seal structure according to claim 1, characterized in that: A keyway is designed on the shaft, and a key is installed in the keyway.

5. The automatic compensation type packing seal structure according to claim 1, characterized in that: A threaded hole is designed on the shaft sleeve, and a screw is set in the threaded hole to press against the shaft to prevent the shaft sleeve from moving.

6. The automatic compensation type packing seal structure according to claim 1, characterized in that: The fixing and pressing member is a nut, and two nuts are provided.

7. The automatic compensation type packing seal structure according to claim 1, characterized in that: A flushing interface is designed on the stuffing box body, and the flushing interface is aligned with the packing ring.

8. The automatic compensation type packing seal structure according to claim 1, characterized in that: There are multiple packings installed in the stuffing box body.

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