Resin pump sealing structure

Abstract

The utility model discloses a resin pump sealing structure, and relates to the technical field of resin pump sealing. One end of the shaft seal cavity is connected with the end of a pump head end cover of the resin pump in a sealed mode, threads are evenly arranged on the inner surface of the internal thread shaft sleeve, the internal thread shaft sleeve is fixedly installed in the shaft seal cavity, one end of the internal thread shaft sleeve is connected with a sliding bearing of the resin pump in a sealed mode, and the other end of the internal thread shaft sleeve is connected with a lip seal assembly in a sealed mode. The lip seal assembly is fixedly arranged on the periphery of the resin pump shaft sleeve in a sleeving mode. According to the utility model, a dual-sealing mechanism of combining the thread sealing of the internal thread shaft sleeve and the lip sealing of the lip sealing assembly is adopted, so that the overall sealing performance of the resin pump is greatly enhanced.

Description

Technical Field

[0001] This utility model relates to the field of resin pump sealing technology, and specifically to a resin pump sealing structure. Background Technology

[0002] In industrial production processes, resin pumps are key equipment for conveying various resin materials, and their operational stability and sealing performance are of paramount importance. Currently, some resin pumps use packing seals. However, in long-term actual operation, this sealing method has revealed significant defects. Due to the characteristics of resin materials and the influence of factors such as pressure and temperature changes during pump operation, packing seals are highly prone to leakage. When the leakage increases, conventional methods such as simply tightening the packing are no longer effective in stopping material leakage at the shaft seal.

[0003] Resin pump leakage not only wastes materials and increases production costs, but also potentially impacts the environment. More seriously, continuous leakage can lead to resin spillage, posing a significant safety risk. Therefore, retrofitting the packing seal resin pumps on-site is urgently needed. Utility Model Content

[0004] The purpose of this invention is to provide a resin pump sealing structure that solves the technical problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A resin pump sealing structure includes a shaft sealing cavity with one end sealed to the end cap of the resin pump head, and an internally threaded bushing with threads uniformly arranged on its inner surface. The internally threaded bushing is fixedly installed in the shaft sealing cavity. One end of the internally threaded bushing is sealed to a sliding bearing of the resin pump, and the other end of the internally threaded bushing is sealed to a lip seal assembly. The lip seal assembly is fixedly sleeved on the outer periphery of the resin pump bushing.

[0007] As a further embodiment of this utility model: the internal threaded bushing and the resin pump bushing are in clearance fit.

[0008] As a further embodiment of this utility model: the pitch of the internal thread of the internal threaded bushing is 0.5-3mm, the thread depth is 0.2-1mm, and the thread direction is opposite to the rotation direction of the resin pump sliding bearing.

[0009] As a further embodiment of this utility model: a positioning pin is provided between the internal threaded bushing and the shaft sealing cavity to prevent circumferential displacement of the internal threaded bushing.

[0010] As a further embodiment of this utility model: the internal threaded bushing is made of stainless steel or wear-resistant alloy, and its surface is polished with a roughness Ra≤0.8μm.

[0011] As a further embodiment of this utility model: the lip sealing assembly includes a lip-shaped sealing ring, the lip of which is made of elastic rubber material, and its cross-section is V-shaped, closely fitting the end face of the internal threaded bushing.

[0012] As a further embodiment of this utility model: a plurality of the lip-shaped sealing rings are arranged sequentially on the outer periphery of the resin pump shaft sleeve.

[0013] As a further embodiment of this utility model, the lip sealing assembly further includes a water seal ring, which is embedded between the lip-shaped sealing rings.

[0014] As a further embodiment of this utility model: a shaft seal cover is installed at the end of the lip seal assembly away from the internal threaded bushing, and the shaft seal cover is detachably and fixedly connected to the end of the shaft seal cavity away from the sliding bearing of the resin pump.

[0015] As a further embodiment of this utility model: the lip seal assembly fills the sealing space formed by the shaft seal cavity, the shaft seal gland, the resin pump bushing, and the internal threaded bushing.

[0016] Compared to traditional single-filler seals, the advantages of this invention are:

[0017] (1) This utility model adopts a dual sealing mechanism that combines the thread seal of the internal threaded bushing with the lip seal of the lip seal assembly, which greatly enhances the overall sealing performance of the resin pump. The thread seal of the internal threaded bushing effectively reduces the leakage amount and leakage pressure by extending the material leakage path and increasing the leakage resistance; while the lip seal of the lip seal assembly serves as secondary protection to further block the leakage of materials. The two work together to provide a more reliable and efficient sealing guarantee for the resin pump, and completely solve the long-standing leakage problem.

[0018] (2) This utility model effectively avoids repetitive maintenance caused by reducing material leakage, as each maintenance requires the replacement of some spare parts due to the curing of the resin material. The frequency of equipment maintenance and part replacement is reduced, thus reducing equipment maintenance costs and improving the continuity and stability of equipment operation;

[0019] (3) The stable and reliable sealing performance of this utility model ensures that the resin pump can operate continuously and stably, reducing the downtime and maintenance time caused by leakage problems, making the production process smoother and more efficient. The improvement of production efficiency helps to reduce product unit consumption and enhance market competitiveness. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a cross-sectional schematic diagram of a resin pump sealing structure according to the present invention;

[0022] Figure 2 This is a practical new Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0023] In the figure: 1. Resin pump head end cover; 2. Shaft seal cavity; 3. Internal threaded shaft sleeve; 4. Resin pump sliding bearing; 5. Lip seal assembly; 51. Lip seal ring; 52. Water seal ring; 6. Resin pump shaft sleeve; 7. Locating pin; 8. Shaft seal gland. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Please see Figure 1As shown, this embodiment of the utility model provides a resin pump sealing structure, including a shaft sealing cavity 2, one end of which is sealed to the end of the resin pump head end cover 1 by bolts. An internally threaded bushing 3 is fixedly installed inside the shaft sealing cavity 2. Preferably, a positioning pin 7 is provided between the internally threaded bushing 3 and the shaft sealing cavity 2 to prevent circumferential displacement of the internally threaded bushing 3. The internally threaded bushing 3 can be made of stainless steel or wear-resistant alloy, and its surface is polished with a roughness Ra≤0.8μm. The inner surface of the internally threaded bushing 3 is uniformly provided with internal threads. One end of the internally threaded bushing 3 is sealed to the resin pump sliding bearing 4, and the other end of the internally threaded bushing 3 is sealed to a lip seal assembly 5. The lip seal assembly 5 is fixedly sleeved on the outer circumference of the resin pump bushing 6. The internally threaded bushing 3 and the resin pump bushing 6 are clearance-fitted, and the clearance should take into account the temperature rise and expansion during equipment operation.

[0028] It is understandable that a shaft seal cover 8 is also installed at the end of the lip seal assembly 5 away from the internal threaded bushing 3. The shaft seal cover 8 is detachably fixed to the end of the shaft seal cavity 2 away from the resin pump sliding bearing 4 by bolts. The lip seal assembly 5 fills the sealing space formed by the shaft seal cavity 2, the shaft seal cover 8, the resin pump bushing 6 and the internal threaded bushing 3. The shaft seal cover 8 is used to adjust the clamping force of the lip seal assembly 5.

[0029] It should be noted that the direction of the internal thread is opposite to the rotation direction of the resin pump sliding bearing 4. The pitch of the internal thread of the internal threaded bushing 3 is 0.5-3mm, and the thread depth is 0.2-1mm. These internal threads create multiple sealing defenses between the internal threaded bushing 3 and the resin pump bushing 6. When material attempts to leak from the gap between the internal threaded bushing 3 and the resin pump bushing 6, it is forced to flow in a meandering manner along the spiral groove of the internal thread. The leakage path of the material is significantly extended, and the leakage resistance is greatly increased, thereby greatly reducing the possibility and pressure of material leakage.

[0030] Meanwhile, the lip seal assembly 5 has a unique elastic structure, and its lip can tightly and closely wrap around the end surface of the internal threaded bushing 3, forming a highly effective secondary sealing barrier. When material breaks through the sealing barrier of the internal threaded bushing 3, the lip seal assembly 5 can further prevent material leakage, minimizing material leakage to the greatest extent.

[0031] Please see Figure 2As shown, in this embodiment, the lip sealing assembly 5 includes a lip seal ring 51. The lip of the lip seal ring 51 is made of elastic rubber with a V-shaped cross-section, tightly fitting the end face of the internally threaded bushing 3. Preferably, multiple lip seal rings 51 can be provided, arranged sequentially around the outer periphery of the resin pump bushing 6, with water seal rings 52 embedded between the lip seal rings 51. Pressure flushing with external cleaning materials further ensures the sealing effect. The lip seal ring 51 possesses good wear resistance and adaptability, maintaining stable and reliable sealing performance under long-term rotation conditions, adapting to complex and changing working environments.

[0032] In practical use:

[0033] Installation of the internal threaded bushing 3: A custom-made internal threaded bushing 3 is made according to the specific model, size parameters, and operating requirements of the resin pump. The internal thread of the bushing 3 should be designed with corresponding reverse internal threads based on the working pressure, material characteristics, and sealing requirements of the resin pump. The internal thread surface should be smooth and free of defects to avoid problems such as irregular threads or rough surfaces that affect sealing performance. Simultaneously, the tolerance between the inner diameter of the bushing 3 and the outer diameter of the resin pump sliding bearing 4 must be strictly controlled within a very small range to ensure a tight fit between the bushing and the resin pump sliding bearing 4, preventing seizing due to normal operating temperature rise. The custom-made internal threaded bushing 3 is then precisely installed on the outside of the resin pump sliding bearing 4, ensuring that the bushing 3 is securely installed without any shaking or misalignment.

[0034] Lip seal assembly 5 installation: Install lip seal assembly 5 onto the end of the internal threaded bushing 3. Before installation, carefully inspect the quality and integrity of lip seal assembly 5 to ensure its elasticity and sealing performance are good. During installation, pay close attention to the installation direction of lip seal assembly 5 to ensure that its lip fits correctly and tightly against the end surface of the internal threaded bushing 3. A dedicated lip seal installation tool can be used to apply even force to press lip seal assembly 5 onto the end of the internal threaded bushing 3, ensuring that lip seal assembly 5 is installed flat and provides a reliable seal.

[0035] Commissioning and Operation: After completing the installation of the lip seal assembly 5 and the internal threaded bushing 3, conduct a comprehensive commissioning and operation of the resin pump. Before starting the pump, check whether the connection between the resin pump bushing 6 and the resin pump sliding bearing 4 is secure and whether the rotation is smooth; check whether the end surfaces of the lip seal assembly 5 and the internal threaded bushing 3 are tightly fitted, and whether there are any gaps or misalignments. Before starting, turn on the sealing flushing fluid. After starting, closely observe the operation of the resin pump shaft seal for any material leakage. If leakage is found, stop the machine immediately and analyze the cause, which may be due to inaccurate installation position of the internal threaded bushing 3, insufficient tightening of the lip seal assembly 5, or defects in the thread seal. For specific problems, adjust the installation position of the internal threaded bushing 3, readjust the tightening force of the lip seal assembly 5, or repair the thread seal until there is no leakage at the shaft seal, ensuring that the resin pump can operate stably and reliably.

[0036] The preferred embodiments of this utility model have been described in detail above and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A resin pump sealing structure, comprising a shaft sealing cavity (2) with one end sealed to the end of the resin pump head end cover (1), characterized in that: It also includes an internal threaded bushing (3) with threads uniformly arranged on its inner surface. The internal threaded bushing (3) is fixedly installed in the shaft sealing cavity (2). One end of the internal threaded bushing (3) is sealed to the resin pump sliding bearing (4), and the other end of the internal threaded bushing (3) is sealed to the lip sealing assembly (5). The lip sealing assembly (5) is fixedly sleeved on the outer periphery of the resin pump bushing (6).

2. The resin pump sealing structure according to claim 1, characterized in that: The internal threaded bushing (3) is clearance-fitted with the resin pump bushing (6).

3. The resin pump sealing structure according to claim 1, characterized in that: The pitch of the internal thread of the internal threaded bushing (3) is 0.5-3mm, the thread depth is 0.2-1mm, and the thread direction is opposite to the rotation direction of the resin pump sliding bearing (4).

4. The resin pump sealing structure according to claim 1, characterized in that: A positioning pin (7) is provided between the internal threaded bushing (3) and the shaft sealing cavity (2) to prevent the internal threaded bushing (3) from circumferential displacement.

5. The resin pump sealing structure according to claim 1, characterized in that: The internal threaded bushing (3) is made of stainless steel or wear-resistant alloy, and its surface is polished with a roughness Ra≤0.8μm.

6. The resin pump sealing structure according to claim 1, characterized in that: The lip sealing assembly (5) includes a lip seal ring (51), the lip of which is made of elastic rubber and has a V-shaped cross section, which fits tightly against the end face of the internal threaded bushing (3).

7. A resin pump sealing structure according to claim 6, characterized in that: Multiple lip seals (51) are arranged sequentially around the outer periphery of the resin pump bushing (6).

8. The resin pump sealing structure according to claim 7, characterized in that: The lip sealing assembly (5) further includes a water seal ring (52), which is embedded between the lip seal rings (51).

9. A resin pump sealing structure according to claim 1, characterized in that: The lip seal assembly (5) is equipped with a shaft seal cover (8) at the end away from the internal threaded bushing (3). The shaft seal cover (8) is detachably fixedly connected to the end of the shaft seal cavity (2) away from the resin pump sliding bearing (4).

10. A resin pump sealing structure according to claim 9, characterized in that: The lip seal assembly (5) fills the sealing space formed by the shaft seal cavity (2), the shaft seal gland (8), the resin pump bushing (6), and the internal thread bushing (3).

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