Packing sealing structure

Abstract

The utility model discloses a packing sealing structure which comprises a rotating shaft and a sealing seat, the rotating shaft penetrates through an inner hole in the middle of the sealing seat, the inner hole of the sealing seat is matched with the outer diameter of the rotating shaft, a sealing cavity is formed in the inner hole of the sealing seat, and elastic ball packing is arranged in the sealing cavity so that the elastic ball packing can make contact with the rotating shaft. The sealing cavity is communicated with the outside through the packing hole, the piston is installed in the packing hole and makes contact with the elastic ball packing, the spring is installed at the upper end of the piston, the spring is compressed by the adjusting bolt to be in a compressed state, and the adjusting bolt is matched with threads on the upper portion of the packing hole to achieve compression degree adjustment. The sealing device can achieve a good sealing effect, is low in cost and convenient to use, compresses the elastic ball filler through the piston, and can achieve the function of a compensation mechanism after abrasion through the cooperation of the spring and the adjusting bolt.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of packing seal, and particularly relates to a packing seal structure. BACKGROUND

[0002] The packing seal is a dynamic sealing device that generates a compression force between the packing and the rotating part and the fixed part through pre-tightening or self-tightening of the medium pressure. After the packing is loaded into the packing cavity, the packing is axially compressed by the gland screw. When the shaft and the packing have relative movement, the packing generates a radial force due to its plasticity and is in close contact with the shaft. At the same time, the lubricant immersed in the packing is squeezed to form an oil film between the contact surfaces. Due to the non-uniform contact state, the "boundary lubrication" state occurs at the contact position, which is called "bearing effect". The concave part that is not in contact forms a small oil groove with a thick oil film. The contact position and the non-contact position form an irregular labyrinth, which prevents liquid leakage. This is called "labyrinth effect". Obviously, a good seal depends on maintaining "bearing effect" and "labyrinth effect". That is, good lubrication and appropriate compression must be maintained. If the lubrication is poor or the compression is too tight, the oil film will be interrupted, causing dry friction between the packing and the shaft, and eventually leading to shaft burning and serious wear. SUMMARY

[0003] To overcome the above-mentioned deficiencies, the inventors of the utility model have made long-term exploration and attempts, and have carried out repeated experiments and efforts. Through continuous reform and innovation, a packing seal structure is proposed. The irregular arrangement of the elastic spherical packing can achieve good sealing effect, low cost, and convenient use. The packing seal structure can be conveniently supplemented and replaced. The piston is used to compress the elastic spherical packing. The spring and the adjusting bolt are matched to realize the function of the compensation mechanism after wear. The adjusting bolt can be tightened downward to compress the elastic spherical packing, so that the worn elastic spherical packing can still continuously fill the sealing cavity.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: a packing seal structure is provided. It comprises a rotating shaft and a sealing seat. The rotating shaft passes through the inner hole of the middle part of the sealing seat. The inner hole of the sealing seat matches the outer diameter of the rotating shaft. A sealing cavity is arranged in the inner hole of the sealing seat. Elastic spherical packing is arranged in the sealing cavity so that the elastic spherical packing is in contact with the rotating shaft. The sealing cavity is connected to the outside through a packing hole. A piston is installed in the packing hole. The piston is in contact with the elastic spherical packing. A spring is installed on the upper end of the piston. The spring is compressed in the compressed state by the adjusting bolt. The adjusting bolt is matched with the threads on the upper part of the packing hole to adjust the compression degree.

[0005] According to the further preferred technical scheme of the packing seal structure, the sealing seat is installed at the opening of the equipment by the fixing bolt and is fixed on the equipment.

[0006] According to the packing seal structure, the further preferred technical scheme is that the sealing seat is provided with a sealing ring on the contact surface with the equipment.

[0007] According to the packing seal structure, the further preferred technical scheme is that the adjusting bolt lower part opening forms a spring mounting hole, and the spring upper end is mounted in the spring mounting hole.

[0008] According to the packing seal structure, the further preferred technical scheme is that the piston is T-shaped, including a plug head and a plug rod, the plug head is in contact with the elastic spherical packing, and the plug rod is sleeved in the spring.

[0009] According to the packing seal structure, the further preferred technical scheme is that the plug head outer diameter is equal to the diameter of the packing hole, and the plug head slides up and down in the packing hole.

[0010] According to the packing seal structure, the further preferred technical scheme is that the sealing cavity is arranged at the contact position of the sealing seat and the rotating shaft, the sealing cavity is cylindrical to cover the rotating shaft, and the cylindrical surface of the sealing cavity is coincident with the rotating shaft axis.

[0011] According to the packing seal structure, the further preferred technical scheme is that the sealing seat inner hole is matched with the rotating shaft outer diameter, and the two ends of the sealing seat are not in contact with the rotating shaft.

[0012] According to the packing seal structure, the further preferred technical scheme is that the adjusting bolt keeps a distance of more than 5mm from the sealing seat after being tightened.

[0013] Compared with the prior art, the technical scheme of the utility model has the following advantages / benefits:

[0014] 1. The elastic spherical packing is irregularly arranged for filling, which can achieve good sealing effect, low cost, convenient use, and convenient replenishment and replacement.

[0015] 2. The elastic spherical packing is compressed by the piston, and the spring and the adjusting bolt are matched, so that the compensation mechanism after wear can be realized, the adjusting bolt can be tightened downward to compress the elastic spherical packing, and the worn elastic spherical packing can still continuously fill the sealing cavity. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation to the scope. Other related drawings can also be obtained by those skilled in the art without creative effort, on the premise of not paying creative effort.

[0017] Figure 1 is a structural schematic view of a packing seal structure of the present application.

[0018] The marks in the figure are as follows: 1. rotating shaft 2. sealing seat 201. inner hole 202. sealing cavity 3. elastic spherical packing 4. packing hole 5. piston 6. spring 7. adjusting bolt 8. sealing ring 9. fixing bolt. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the embodiments of the present application will be clearly and completely described as follows. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application. Therefore, the detailed description of the embodiments of the present application provided below is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application.

[0020] It should be noted that: similar labels and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it can not be further defined and explained in subsequent drawings.

[0021] Embodiment:

[0022] As Figure 1As shown, a packing seal structure. It includes a rotating shaft 1, a sealing seat 2, the rotating shaft 1 passes through the inner hole 201 in the middle of the sealing seat 2, the inner hole 201 of the sealing seat 2 matches the outer diameter of the rotating shaft 1, a sealing cavity 202 is arranged in the inner hole 201 of the sealing seat 2, an elastic spherical packing 3 is arranged in the sealing cavity 202 so that the elastic spherical packing 3 is in contact with the rotating shaft 1, the sealing cavity 202 is communicated with the outside through a packing hole 4, a piston 5 is installed in the packing hole 4, the piston 5 is in contact with the elastic spherical packing 3, a spring 6 is installed on the upper end of the piston 5, the spring 6 is compressed in a compressed state by an adjusting bolt 7, the adjusting bolt 7 is matched with the threads on the upper part of the packing hole 4 to adjust the compression degree, the lower part of the adjusting bolt 7 is provided with a hole to form a spring mounting hole, the upper end of the spring 6 is mounted in the spring mounting hole to realize the positioning installation of the spring 6, of course, the installation mode between the spring 6 and the adjusting bolt 7 can be adjusted according to the requirements and actual conditions, which is mainly used to prevent the spring 6 from deviating from the position.

[0023] The sealing seat 2 is installed at the opening of the equipment by a fixing bolt 9 and is fixed on the equipment, that is, the sealing seat 2 is used to block the opening, and then the inner hole 201 is left to install the rotating shaft 1, at this time, only the position in contact with the rotating shaft 1 needs to be sealed.

[0024] The sealing seat 2 is provided with a sealing ring 8 on the contact surface with the equipment for sealing to prevent leakage.

[0025] The piston 5 is T-shaped, which includes a plug head and a plug rod, the plug head is in contact with the elastic spherical packing 3, and the plug rod is sleeved in the spring 6, the piston 5 is arranged in this structure, which can meet the requirements of spring 6 connection and fixation at the rear end and the requirements of piston 5 action at the front end, if necessary, the thickness of the plug head of the piston 5 can be increased to a certain extent to increase the area of the matching surface and realize better guiding effect.

[0026] The outer diameter of the plug head is equal to the diameter of the packing hole 4, the plug head slides up and down in the packing hole 4, and the plug head is in direct contact with the elastic spherical packing 3 to produce extrusion, so that the elastic spherical packing 3 is extruded in the sealing cavity 202 to realize the sealing effect.

[0027] The sealing cavity 202 is arranged at the position where the sealing seat 2 contacts the rotating shaft 1, the sealing cavity 202 is cylindrical to cover the rotating shaft 1, and the cylinder of the sealing cavity 202 coincides with the axis of the rotating shaft 1, the purpose of which is mainly to realize the uniform thickness of the elastic spherical packing 3 around the rotating shaft 1 and facilitate filling and thickness guarantee.

[0028] The inner hole 201 of the sealing seat 2 matches the outer diameter of the rotating shaft 1, and the two ends of the sealing seat 2 are not in contact with the rotating shaft 1 to avoid interfering with the rotation of the rotating shaft 1.

[0029] The adjusting bolt 7 is kept above 5mm apart from the sealing seat 2 after being screwed, so that the adjusting bolt 7 has enough length to realize the compression function.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "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 lower than that of the second feature.

[0033] The above is only the preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as limiting the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled persons in the art, without departing from the spirit and scope of the present application, a number of improvements and refinements can be made, which should also be regarded as the protection scope of the present application.

Claims

1. A packing seal structure, characterized by, It includes a rotating shaft and a sealing seat, the rotating shaft passes through the inner hole of the middle part of the sealing seat, the inner hole of the sealing seat matches the outer diameter of the rotating shaft, a sealing cavity is arranged in the inner hole of the sealing seat, an elastic spherical packing is arranged in the sealing cavity to make the elastic spherical packing contact with the rotating shaft, the sealing cavity is communicated with the outside through a packing hole, a piston is installed in the packing hole, the piston contacts with the elastic spherical packing, a spring is installed on the upper end of the piston, the spring is compressed by an adjusting bolt, the adjusting bolt is matched with the thread on the upper part of the packing hole to adjust the compression degree.

2. A packing seal structure according to claim 1, wherein The sealing seat is installed at the opening of the equipment by a fixing bolt and is fixed on the equipment.

3. A packing seal structure according to claim 2, wherein A sealing ring is arranged on the contact surface of the sealing seat and the equipment.

4. A packing seal structure according to claim 1, wherein The lower part of the adjusting bolt is provided with an opening to form a spring mounting hole, and the upper end of the spring is mounted in the spring mounting hole.

5. A packing seal structure according to claim 4, wherein The piston is T-shaped, including a plug head and a plug rod, the plug head contacts with the elastic spherical packing, and the plug rod is sleeved in the spring.

6. A packing seal structure according to claim 5, wherein The outer diameter of the plug head is equal to the diameter of the packing hole, and the plug head slides up and down in the packing hole.

7. A packing seal structure according to claim 1, wherein The sealing cavity is arranged at the contact position of the sealing seat and the rotating shaft, the sealing cavity is cylindrical to cover the rotating shaft, and the cylinder of the sealing cavity coincides with the axis of the rotating shaft.

8. A packing seal structure according to claim 6, wherein The two ends of the sealing seat are not in contact with the rotating shaft.

9. A packing seal structure according to claim 1, wherein After the adjusting bolt is tightened, a space of more than 5mm is kept between the adjusting bolt and the sealing seat.

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