Driving shaft multi-sealing structure and feeding machine

Abstract

The utility model discloses a driving shaft multi-sealing structure and a feeding machine. The multi-sealing structure is located among a driving shaft, a fixing body arranged on the periphery of the driving shaft and a rotating body arranged above the fixing body in a sealing mode and connected with the driving shaft. A first dynamic seal is arranged between the rotating body and the fixed body; a second dynamic seal is arranged between the periphery of the driving shaft and the rotating body; an air-tight sealing cavity is further formed among the fixed body, the rotating body and the driving shaft, and the first dynamic seal and / or the second dynamic seal are / is arranged on an air-tight sealing path of the air-tight sealing cavity. The utility model further comprises the feeder comprising the multi-sealing structure. The sealing structure can effectively guarantee the sealing reliability of equipment and reduce environmental pollution, and the whole sealing structure can resist high temperature, is suitable for various working conditions and has a remarkable sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft sealing, in particular to a driving shaft multiple sealing structure and a feeder. Background Art

[0002] Existing drive shaft sealing structures typically form a dynamic seal between the drive shaft and the rotating element. Because dynamic seals rely primarily on friction to achieve sealing, over long-term operation, friction and temperature fluctuations can cause seal components to wear or age, leading to a decrease in sealing effectiveness and leakage. This not only causes material loss but can also pollute the surrounding environment.

[0003] For example, existing homogeneous disc feeders have the advantages of uniform material discharge, wide material adaptability, first-in-first-out material, stable and reliable operation, and the ability to reduce the height of the silo. They are widely used in various fields. However, existing homogeneous disc feeders still have some problems in the sealing design of the drive shaft. Specifically, dynamic sealing structures are usually adopted in the existing technology, and this sealing method has certain limitations: on the one hand, the sealing effect of dynamic seals is relatively poor, and leakage is prone to occur, resulting in material loss or environmental pollution; on the other hand, loose sealing may cause leakage of lubricating oil or other liquids inside the equipment, increasing the maintenance cost and failure risk of the equipment; in addition, incomplete sealing may also affect the operating stability and service life of the equipment. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide a drive shaft multiple sealing structure and a feeder which have good sealing effect, high reliability and reduced environmental pollution.

[0005] The technical solution of the utility model is:

[0006] The utility model provides a multiple-sealing structure of a drive shaft, which is located between the drive shaft, a fixed body arranged on the outer periphery of the drive shaft, and a rotating body with a seal arranged above the fixed body and connected to the drive shaft; a first dynamic seal is provided between the rotating body and the fixed body; a second dynamic seal is provided between the outer periphery of the drive shaft and the rotating body; an airtight sealing cavity is also provided between the fixed body, the rotating body and the drive shaft, and the first dynamic seal and / or the second dynamic seal are provided on the airtight sealing path of the airtight sealing cavity.

[0007] Furthermore, a gap is provided between the airtight sealing cavity and the drive shaft and the rotating body to form the airtight sealing path; an air inlet is provided on the airtight sealing cavity, and the gap between the rotating body and the fixed body forms an exhaust channel.

[0008] Furthermore, the compressed gas passes through the air inlet, sequentially passes through the gap between the airtight chamber and the drive shaft, and the gap between the airtight chamber and the rotating body, and is finally discharged through the exhaust channel.

[0009] Furthermore, an elastic cushion is provided below the first dynamic seal.

[0010] Furthermore, the airtight sealing chamber is circumferentially arranged outside the drive shaft; the second dynamic seal is arranged between the rotating body and the airtight sealing chamber; the first dynamic seal is arranged on the exhaust channel of the airtight sealing chamber; a third dynamic seal is also arranged between the drive shaft and the fixed body, and the third dynamic seal is arranged below the airtight sealing chamber.

[0011] Furthermore, a first static seal is provided between the end face of the drive shaft and the rotating body; and a second static seal is provided between the fixed body and the airtight sealing cavity.

[0012] A feeder of the present invention comprises the drive shaft multiple sealing structure described in any one of the above items.

[0013] Furthermore, the rotating body is a turntable, which includes a support seat connected to the drive shaft and a disc body connected to the support seat; the fixed body includes a chassis.

[0014] Furthermore, the first dynamic seal is circumferentially arranged between the support seat of the turntable and the chassis, and an elastic cushion with compression capacity is provided in the groove on the upper surface of the chassis, and the elastic cushion is arranged below the first dynamic seal; the second dynamic seal is circumferentially arranged between the support seat of the turntable and the airtight sealing cavity; the third dynamic seal is located below the airtight sealing cavity and is circumferentially arranged between the drive shaft and the bottom of the chassis.

[0015] Furthermore, the first static seal is circumferentially arranged in the groove of the end face of the drive shaft and is located between the drive shaft and the support seat of the turntable; the second static seal is circumferentially arranged between the airtight sealing cavity and the chassis.

[0016] The beneficial effects of the present invention are as follows: through the rational design of multi-layer dynamic seals and their combination with the airtight sealing cavity, on the one hand, leakage can be effectively reduced, the leakage of materials and internal leakage of the drive system can be prevented, and the risk of pollution can be reduced; and the entire sealing structure can withstand high temperatures, adapt to a variety of working conditions, and has a significant sealing effect; on the other hand, the operating stability and reliability of the equipment are improved, the service life of the equipment is extended, and the maintenance and repair costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a feeder according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 An enlarged schematic diagram of portion A of the illustrated embodiment;

[0019] Figure 3 yes Figure 2 An enlarged schematic diagram of portion B of the illustrated embodiment.

[0020] Description of the accompanying drawings:

[0021] 1. Frame; 2. Upper flange; 3. Cylinder; 4. Drive base; 5. Drive motor; 6. Drive shaft; 7. Turntable; 8. Chassis; 9. Airtight seal chamber; 71. Support base; 72. Disc body; 73. Arch breaking tip; 81. Discharge port; 91. Casing; 92. Air inlet; 93. Airtight seal path; 94. Exhaust channel; 101. First dynamic seal; 102. Second dynamic seal; 103. Third dynamic seal; 104. First static seal; 105. Second static seal; 106. Elastic cushion. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 The figure shows a feeder comprising a frame 1 and a barrel 3 for holding material. The barrel 3 is connected to the silo via an upper flange 2. The frame is provided with a drive base 4, supported by a drive motor 5. The drive motor is connected to a turntable 7 via a drive shaft 6. A chassis 8 is provided below the turntable, passing through the drive shaft 6 and fixed to the frame 1. The chassis 8 is provided with a discharge port 81. The turntable 7 includes a support base 71 connected to the drive shaft 6 and a disc body 72 connected to the support base. The support base 71 of the turntable is provided with a broken arch 73. The support base 71 and the broken arch 73 extend into the barrel 3. When the drive motor 5 drives the drive shaft 6 to drive the turntable 7 to rotate, the material in the barrel 3 flows evenly and smoothly around the turntable 7 and is discharged through the discharge port 81 via the turntable 7.

[0024] like Figure 2 and Figure 3 As shown: In order to ensure the sealing of the equipment, especially the dynamic seal at the drive shaft, this embodiment is designed with multiple seals. Specifically:

[0025] A first dynamic seal 101 is installed between the support base 71 of the turntable 7 and the chassis 8, serving as the first dynamic seal. The upper surface of the chassis 8 is provided with at least one annular groove, within which a resilient cushion 106 is positioned. The cushion 106 is positioned below the first dynamic seal 101, with its lower end positioned within the groove. The cushion 106 has a certain degree of compression, ensuring close contact between the first dynamic seal 101 and the support base 71 of the turntable 7, ensuring a tight seal.

[0026] A second dynamic seal 102 is provided between the outer periphery of the drive shaft 6 and the support seat 71 of the turntable 7, serving as a second dynamic seal. In this embodiment, the second dynamic seal 102 can be circumferentially arranged in the groove on the inner wall of the support seat 71 of the turntable 7, and sealed to the drive shaft 6. An airtight sealing cavity 9 can also be further provided on the outer periphery of the drive shaft 6 to strengthen the seal. Preferably, an airtight sealing cavity 9 is provided between the chassis 8, the turntable 7 and the drive shaft 6 of this embodiment; the airtight sealing cavity 9 is a structure surrounded by an outer shell 91 and having an airtight path 93 formed inside. The outer shell 91 of the airtight sealing cavity 9 is fixed to the frame 1, and the outer shell 91 of the airtight sealing cavity 9 is clamped with the inner wall of the chassis 8. The upper part of the outer shell 91 extends out of the chassis 8 and is located between the drive shaft 6 and the lower concave cavity of the support seat 71. Gaps are provided between the airtight chamber 9 and the support base 71 of the drive shaft 6 and the turntable 7, forming an airtight path 93. An air inlet 92, communicating with the outside world, is provided at the bottom of the airtight chamber 9 for inputting compressed gas. The gap between the support base 71 and the chassis 8 forms an exhaust passage 94. The principle is as follows: compressed gas first enters the gap between the airtight chamber 9 and the drive shaft 6 through the air inlet 92, then enters the gap between the airtight chamber 9 and the support base 71, thereby flowing along the airtight path 93 formed by these gaps, and finally is discharged through the exhaust passage 94 between the support base 71 and the chassis 8, entering the cylinder 3. Among them, the first dynamic seal 101 is provided on the exhaust channel 94 between the support seat 71 and the chassis 8, and a certain gap is left between the exhaust channel 94 to facilitate the discharge of compressed gas. The second dynamic seal 102 is provided between the support seat 71 and the outer shell 91 of the airtight chamber 9. The lower portion of the inner wall of the support seat 71 forms a stepped structure, that is, the lower concave cavity of the support seat first accommodates the drive shaft 6 and the upper portion of the outer shell 91 of the airtight chamber 9, and then a groove is further formed on the inner wall along the lower concave cavity of the support seat 71 to accommodate the second dynamic seal 102. A gap is provided between the second dynamic seal 102 and the outer shell 91 of the airtight chamber 9 to facilitate the discharge of compressed gas.

[0027] A third dynamic seal 103 is installed between the drive shaft 6 and the underside of the chassis 8, serving as a third dynamic seal. Located below the airtight seal cavity 9 and circumferentially arranged around the drive shaft 6, this seal prevents external air from entering the chassis 8 from this location. It is understood that this seal can be equipped with a cooling device and a compression mechanism to optimize the sealing effect. For example, a compression bolt can be provided to tightly press the third dynamic seal 103 between the drive shaft 6 and the chassis 8.

[0028] It is understandable that each dynamic seal is preferably a sealing ring, and the material can be selected from wear-resistant and high-temperature resistant materials to adapt to the sealing of various materials.

[0029] In the embodiment, the cavity in the three dynamic seals is under positive pressure due to the blocking of the first dynamic seal 101 and the second dynamic seal 102, which can effectively prevent the material from entering the sealing cavity, ensure the reliability and sealing effect of the shaft seal, and reduce the damage and operation failure of the equipment caused by material leakage.

[0030] In the embodiment, the end surface of the drive shaft 6 and the support seat 71 of the rotating disc are provided with the first static seal 104. Specifically, a groove for placing the first static seal 104 is arranged on the end surface of the drive shaft 6, and the first static seal 104 is preferably an O-ring and is sealingly connected with the lower cavity of the support seat 71.

[0031] In the embodiment, the gas sealing cavity 9 and the bottom disc 8 are provided with the second static seal 105. Specifically, the second static seal 105 is arranged at the clamping position of the gas sealing cavity 9 and the bottom disc 8, and the second static seal 105 is preferably an O-ring.

[0032] The working principle of the embodiment is as follows:

[0033] The first dynamic seal 101 is arranged between the rotating disc 7 and the bottom disc 8 to form a sealing interface, and the sealing interface is distributed in the circumferential direction. The bottom disc 8 is provided with an elastic soft pad 106 having a compression amount. During the contact with the support seat 71 of the rotating disc 7, the elastic soft pad 106 can be compressed according to the pressure to further enhance the sealing effect. When the rotating disc 7 rotates, the first dynamic seal ensures that the material in the cylinder 3 cannot enter the sealing cavity. The second dynamic seal 102 is arranged to isolate the rotating part of the rotating disc 7 from the gas sealing cavity 9, and the gas sealing cavity 9 is further isolated from the drive shaft 6, while maintaining the positive pressure state in the gas sealing cavity 9. The second dynamic seal 102 can prevent the material or other impurities from entering the gas sealing cavity 9, effectively maintain the efficient operation of the equipment, and greatly reduce the environmental pollution. The third dynamic seal 103 is arranged to further enhance the sealing effect of the drive shaft 6, prevent any possible external pollutants from entering the sealing cavity, especially at the contact position of the drive shaft 6 and the bottom disc 8. Moreover, the internal pressure of the gas sealing cavity 9 can be effectively maintained through the third dynamic seal 103, which further ensures the uniform flow of the material in the cylinder 3 and prevents any external material or material leakage from affecting the normal operation of the equipment.

[0034] In addition, by setting the first static seal 104, leakage between the drive shaft 6 and the rotating disc 7 can be prevented. The first static seal 104 is placed in the groove of the end surface of the drive shaft 6, and is in contact with the support seat 71 of the rotating disc 7 through its elasticity, forming a sealing interface. When the device is running, the first static seal 104 is deformed under pressure, and can fill the gap between the drive shaft 6 and the support seat 71, effectively preventing the material and external contaminants from entering the sealed cavity; by setting the second static seal 105, external impurities or contaminants can be further prevented from entering the gas seal cavity 9. At the contact position of the gas seal cavity 9 and the bottom disc 8, the second static seal 105 is tightly attached to the contact surface between the gas seal cavity 9 and the bottom disc 8 through its elastic deformation, blocking the gas from leaking outward, ensuring that the pressure in the gas seal cavity 9 is not affected, and maintaining the gas tightness.

[0035] It can be understood that the drive shaft multiple sealing structure of the embodiment can also be used in other devices, such as pumps, mixers, etc.

[0036] In summary, the multi-layer sealing structure can effectively ensure the reliability of the device sealing, reduce environmental pollution, and the entire sealing structure can withstand high temperature, adapt to various working conditions, and has remarkable sealing effect.

[0037] In addition, the term "connection" should be broadly understood, for example, it can include fixed connection, detachable connection or integral connection; it can include direct connection, indirect connection through intermediate medium, and also can include the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0039] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A drive shaft multi-seal structure, located between a drive shaft, a fixed body disposed on the periphery of the drive shaft, and a rotating body sealed above the fixed body and connected to the drive shaft; characterized in that: A first dynamic seal is provided between the rotating body and the fixed body; a second dynamic seal is provided between the outer periphery of the drive shaft and the rotating body; an airtight sealing cavity is also provided between the fixed body, the rotating body and the drive shaft; the first dynamic seal and / or the second dynamic seal are provided on the airtight sealing path of the airtight sealing cavity.

2. The drive shaft multi-sealing structure according to claim 1, characterized in that: A gap is provided between the airtight sealing cavity and the drive shaft and the rotating body to form the airtight sealing path; an air inlet is provided on the airtight sealing cavity, and the gap between the rotating body and the fixed body forms an exhaust channel.

3. The drive shaft multiple sealing structure according to claim 2, characterized in that: The compressed gas passes through the air inlet, sequentially passes through the gap between the airtight chamber and the drive shaft, and the gap between the airtight chamber and the rotating body, and is finally discharged through the exhaust channel.

4. The drive shaft multiple sealing structure according to claim 1, 2 or 3, characterized in that: An elastic cushion is provided below the first dynamic seal.

5. The drive shaft multiple sealing structure according to claim 2 or 3, characterized in that: The airtight sealing chamber is circumferentially arranged outside the drive shaft; the second dynamic seal is arranged between the rotating body and the airtight sealing chamber; the first dynamic seal is arranged on the exhaust channel of the airtight sealing chamber; a third dynamic seal is also arranged between the drive shaft and the fixed body, and the third dynamic seal is arranged below the airtight sealing chamber.

6. The drive shaft multiple sealing structure according to claim 2 or 3, characterized in that: A first static seal is provided between the end face of the driving shaft and the rotating body; and a second static seal is provided between the fixed body and the airtight sealing cavity.

7. A feeder, characterized in that: It comprises the drive shaft multiple sealing structure according to any one of claims 1 to 6.

8. The feeder according to claim 7, characterized in that The rotating body is a turntable, which includes a support seat connected to the driving shaft and a disc body connected to the support seat; the fixed body includes a chassis.

9. The feeder according to claim 8, characterized in that The first dynamic seal is circumferentially arranged between the support seat of the turntable and the chassis, and an elastic cushion with compression capacity is provided in the groove on the upper surface of the chassis, and the elastic cushion is arranged below the first dynamic seal; the second dynamic seal is circumferentially arranged between the support seat of the turntable and the airtight sealing cavity; the third dynamic seal is located below the airtight sealing cavity and is circumferentially arranged between the drive shaft and the bottom of the chassis.

10. The feeder according to claim 8, characterized in that The first static seal is circumferentially arranged in the groove of the end face of the drive shaft and is located between the drive shaft and the support seat of the turntable; the second static seal is circumferentially arranged between the airtight sealing cavity and the chassis.

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