Shaft seal system of feeding screw of wet sludge stock bin

Abstract

The utility model discloses a shaft seal system of a wet sludge stock bin feeding screw, which comprises a stock bin, a conveying shaft, a dust cover, a first framework oil seal, a second framework oil seal, a temperature probe and a fat liquoring device, the conveying shaft extends into the stock bin from the end part of one end outside the stock bin, and a helical ribbon is arranged on the conveying shaft in the stock bin; the dustproof cover is arranged at the intersection of the stock bin and the conveying shaft; the first framework oil seal and the second framework oil seal are both arranged on the conveying shaft on the inner side of the dust cover, and a gap is reserved between the first framework oil seal and the second framework oil seal to form a lubricating grease cavity; the detection end of the temperature probe extends into the lubricating grease cavity; the top of the dustproof cover corresponding to the lubricating grease cavity is provided with a first grease adding nozzle, the bottom of the dustproof cover corresponding to the lubricating grease cavity is provided with a second grease adding nozzle, and the grease adding device is communicated with the second grease adding nozzle. According to the utility model, wet sludge in the stock bin is isolated by filling the lubricating grease, and meanwhile, the original dry friction or boundary friction between the framework oil seal and the main shaft is changed into liquid friction with a stable oil film, so that the abrasion is reduced, and the operation is stable.

Description

Technical Field

[0001] The utility model relates to a shaft sealing system for a feeding screw of a wet sludge silo, belonging to the technical field related to petrochemical sludge processing equipment. Background Art

[0002] In the production process of petrochemical products, sludge is inevitably produced. The wet sludge silo feed screw is an important equipment in the sludge treatment system. The screw speed can be adjusted by frequency conversion to achieve continuous adjustment and uniform discharge. The stable operation of the wet sludge silo feed screw directly affects the material balance of the entire sewage plant area and is crucial to the stable operation of the upstream unit.

[0003] However, since the medium handled by the wet sludge silo feeding screw is relatively special, the sludge contains more impurity particles and has a high water content. In the actual production process, the water in the sludge carries hard particles that will cause foreign matter blockage. At the same time, the lack of lubrication measures makes the shaft seal system easy to wear, resulting in a high failure rate of the shaft seal position, odor emission, sludge leakage, high maintenance frequency, and poor on-site appearance. For this reason, the inventor has improved the shaft seal structure to ensure the stable operation of the wet sludge silo feeding screw. Utility Model Content

[0004] The utility model provides a shaft sealing system for a feeding screw of a wet sludge silo, which adopts a scheme of adding two grease filling nozzles to the cavity of a dust cover, and uses grease to isolate the sludge to form an independent sealing cavity. Manual grease filling can also be used with an automatic grease filling device, so as to improve the sealing and lubrication conditions between the skeleton oil seal and the main shaft. On the one hand, it can reduce the frequency of shutdown and maintenance and maintain the stable operation of the unit. On the other hand, it blocks the leakage of sludge, reduces on-site pollution and improves the on-site appearance. Furthermore, automatic grease filling can be realized to reduce the on-site labor intensity.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows:

[0006] A shaft sealing system for a wet sludge silo feeding screw comprises a silo and a conveying shaft, wherein the conveying shaft extends from one end outside the silo into the silo, a spiral belt is arranged on the conveying shaft in the silo, and further comprises a dust cover, a first skeleton oil seal, a second skeleton oil seal, a temperature probe and a greasing device;

[0007] The dust cover is arranged outside the silo, at the intersection of the silo and the conveying shaft, and the end of the conveying shaft passes through the dust cover to connect the driving device; the first skeleton oil seal and the second skeleton oil seal are both arranged on the conveying shaft inside the dust cover, and a gap is left between the first skeleton oil seal and the second skeleton oil seal to form a grease cavity (the space between the first skeleton oil seal and the second skeleton oil seal in the dust cover); the first skeleton oil seal is arranged at the intersection of the silo and the conveying shaft in the dust cover, and the second skeleton oil seal is arranged in the dust cover away from the intersection of the silo and the conveying shaft; the first skeleton oil seal is composed of more than three skeleton oil seals arranged in parallel, and the second skeleton oil seal is composed of more than one skeleton oil seal arranged in parallel; the detection end of the temperature probe extends into the grease cavity;

[0008] A first grease nozzle is arranged on the top of the dust cover corresponding to the grease cavity, and a movably connected sealing cover is arranged on the first grease nozzle; a second grease nozzle is arranged on the bottom of the dust cover corresponding to the grease cavity, and the grease device is connected to the second grease nozzle.

[0009] The end of the conveying shaft passes through the dust cover and is connected to the driving device, and rotates under the drive of the driving device. The driving device is a power device such as a motor.

[0010] The intersecting end of the silo and the conveying shaft in the dust cover is also called the medium side. The first skeleton oil seal is used to isolate dirt and impurities; the second skeleton oil seal is used to isolate grease.

[0011] In this application, connectivity refers to connection and communication.

[0012] The utility model forms a shaft sealing system through a dust cover, and more than three sets of skeleton oil seals are installed on the medium side to isolate dirt and impurities; more than one set of skeleton oil seals are arranged on the outermost side to isolate grease; the middle part (between the first skeleton oil seal and the second skeleton oil) is a grease cavity, and the grease is manually or automatically injected into the grease adding nozzle to play the role of sealing, isolation and lubrication. Firstly, due to the added grease, the friction state between the skeleton oil seal and the main shaft is changed from the previous mixed friction to stable liquid friction, which protects the main shaft while increasing the service life of the skeleton oil seal; secondly, the entire shaft sealing system is almost maintenance-free, and only grease needs to be added once in a while. The first grease adding nozzle can be opened to add grease manually, or grease can be added through a grease adding device.

[0013] The temperature probe is used to detect the temperature in the grease cavity. When the temperature is greater than the set value, grease can be added manually or automatically.

[0014] In order to facilitate assembly, the dust cover is a hollow cylindrical shape, one end of the dust cover is a connection end, and the other end is a free end. A flange is provided on the outside of the dust cover connection end. The dust cover is connected to the end of the silo through the flange, and the end of the conveying shaft passes through the free end of the dust cover to connect the driving device. Bolt holes are provided on the flange, which are fastened by hexagon socket bolts.

[0015] As one of the specific implementation schemes, the connecting end of the dust cover is an open structure, and the connecting end of the dust cover is sealed and fitted with the silo; the free end of the dust cover is a closed end structure, and a through hole is provided in the center of the free end of the dust cover, and the end of the conveying shaft passes through the through hole to connect with the driving device, and the driving device drives the conveying shaft to rotate.

[0016] Required seals and the like may be provided between the components as required.

[0017] The dust cover is coaxially arranged with the conveying shaft, that is, the dust cover is coaxial with the conveying shaft.

[0018] In order to take into account both the sealing effect and the cost, the first skeleton oil seal is composed of three skeleton oil seals arranged in parallel, and the second skeleton oil seal is composed of one skeleton oil seal; the outer ring of the first skeleton oil seal and the outer ring of the second skeleton oil seal are both transitionally matched with the inner wall of the dust cover, and the inner ring of the first skeleton oil seal and the inner ring of the second skeleton oil seal are both clearance matched with the conveying shaft. The aforementioned clearance fit can only allow grease to penetrate, and the grease is used to block impurities such as sludge particles. Preferably, the inner ring of the first skeleton oil seal and the inner ring of the second skeleton oil seal are filled with a grease layer with the conveying shaft.

[0019] The detection end of the temperature probe extends from the second grease nozzle into the grease cavity, so no additional hole is required, and the detection end of the temperature probe extends to the vicinity of the conveying shaft, but does not contact the conveying shaft, and does not affect the normal rotation of the conveying shaft.

[0020] The second grease nozzle is provided with a control valve, the grease device is provided with a control system, and the control valve and the temperature probe are both connected to and controlled by the control system.

[0021] You can add grease manually through the first grease nozzle. Or when the temperature probe detects that the temperature of the grease cavity exceeds the set value, the grease adding device will open the control valve to automatically add grease.

[0022] The grease adding device adopts the existing automatic grease adding device (also known as automatic grease filler, etc.), and the above control system is the system provided by the existing automatic grease adding device. This application has no special improvements on the control system itself, and the connection and control method between the control system and various components, so it will not be repeated.

[0023] For easy disassembly and assembly, the second grease nozzle is threadedly connected to the grease device or connected through a threaded adapter. The existing grease device is provided with a discharge port, and the grease device and the second grease nozzle can be processed into a matching thread matching relationship, and the two can be directly threadedly connected or connected through a threaded adapter.

[0024] The technologies not mentioned in this utility model are all referred to the prior art.

[0025] The shaft sealing system of the wet sludge silo feeding screw of the utility model has the following beneficial effects:

[0026] 1. By adding grease, the wet sludge in the silo can be isolated, and the original dry friction or boundary friction between the skeleton oil seal and the main shaft can be changed into liquid friction with a stable oil film, which can enhance the lubrication effect, reduce wear, extend the service life and reduce production costs;

[0027] 2. Reduce the frequency of downtime and maintenance, ensuring the stable operation of the feeding screw of the wet sludge silo;

[0028] 3. It improves the degree of automation, saves manpower, and greatly reduces the labor intensity of the team.

[0029] 4. It blocks the leakage of sludge, reduces on-site pollution and improves the on-site appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the shaft sealing system of the feeding screw of the wet sludge silo in Example 1 of the utility model;

[0031] Figure 2 This is a schematic structural diagram of the shaft sealing system of the feeding screw of the wet sludge silo in Example 1 of the utility model;

[0032] In the figure, 1 is a silo, 2 is a conveying shaft, 3 is a dust cover, 31 is a grease cavity, 32 is a first grease nozzle, 33 is a second grease nozzle, 34 is a sealing cover, 35 is a flange, 4 is a first skeleton oil seal, 5 is a second skeleton oil seal, 6 is a temperature probe, 7 is a grease device, and 8 is a control valve. DETAILED DESCRIPTION

[0033] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0034] In this application, directional words such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings or in use, and are only for the convenience of describing the application, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the application.

[0035] Example 1

[0036] like Figure 1As shown, a shaft sealing system for a wet sludge silo feeding screw includes a silo and a conveying shaft, wherein the conveying shaft extends from one end outside the silo into the silo, a spiral belt is arranged on the conveying shaft in the silo, and further includes a dust cover, a first skeleton oil seal, a second skeleton oil seal, a temperature probe and a greasing device;

[0037] The dustproof cover is arranged outside the silo and covers the intersection of the silo and the conveying shaft. The end of the conveying shaft passes through the dust cover to connect the driving device; the first skeleton oil seal and the second skeleton oil seal are both arranged on the conveying shaft inside the dust cover, and a gap is left between the first skeleton oil seal and the second skeleton oil seal to form a grease cavity; the first skeleton oil seal is arranged at the intersection of the silo and the conveying shaft in the dust cover, and the second skeleton oil seal is arranged in the dust cover away from the intersection of the silo and the conveying shaft; the first skeleton oil seal is composed of more than three skeleton oil seals arranged in parallel, and the second skeleton oil seal is composed of more than one skeleton oil seal arranged in parallel; the detection end of the temperature probe extends into the grease cavity;

[0038] A first grease nozzle is arranged on the top of the dust cover corresponding to the grease cavity, and a movably connected sealing cover is arranged on the first grease nozzle; a second grease nozzle is arranged on the bottom of the dust cover corresponding to the grease cavity, and the grease device is connected to the second grease nozzle.

[0039] The above-mentioned dust cover forms a shaft sealing system, and more than three sets of skeleton oil seals are installed on the medium side to isolate dirt and impurities; more than one set of skeleton oil seals are set on the outermost side to isolate grease; the middle part (between the first skeleton oil seal and the second skeleton oil) is a grease cavity, which plays the role of sealing, isolation and lubrication by manually or automatically injecting grease into the grease nozzle. First, due to the added grease, the friction state between the skeleton oil seal and the main shaft is changed from the previous mixed friction to stable liquid friction, which protects the main shaft while increasing the service life of the skeleton oil seal; secondly, the entire shaft sealing system is almost maintenance-free, and only grease needs to be added once in a while. Grease can be added manually by opening the first grease nozzle, or by a grease adding device. The above-mentioned temperature probe is used to detect the temperature in the grease cavity. When the temperature is greater than the set value, grease can be added manually or automatically.

[0040] Example 2

[0041] On the basis of Example 1, the following improvements are further made: in order to facilitate assembly, the dust cover is a hollow cylindrical shape, the dust cover is coaxially arranged with the conveying shaft, one circumferential end of the dust cover is a connecting end, and the other end is a free end, the connecting end of the dust cover is an open structure, the connecting end of the dust cover is sealed and fits with the silo, a flange is provided on the outer side of the connecting end of the dust cover, the dust cover is connected to the end of the silo through the flange (bolt holes are provided on the flange, and are fastened by hexagon socket bolts), the free end of the dust cover is a closed end structure, a through hole is provided in the center of the free end of the dust cover, and the end of the conveying shaft passes through the through hole to connect with the driving device.

[0042] Example 3

[0043] On the basis of Example 1 or 2, the following improvements are further made: in order to take into account both the sealing effect and the cost problem, the first skeleton oil seal is composed of three skeleton oil seals arranged in parallel, and the second skeleton oil seal is composed of one skeleton oil seal; the outer ring of the first skeleton oil seal and the outer ring of the second skeleton oil seal are both transitionally matched with the inner wall of the dust cover, and the inner ring of the first skeleton oil seal and the inner ring of the second skeleton oil seal are both clearance matched with the conveying shaft. The aforementioned clearance fit can only allow grease to penetrate, and the grease is used to block impurities such as sludge particles. Preferably, the inner ring of the first skeleton oil seal and the inner ring of the second skeleton oil seal are filled with a grease layer with the conveying shaft.

[0044] Example 4

[0045] On the basis of Example 3, the following improvements are further made: the detection end of the temperature probe extends from the second grease nozzle into the grease cavity, so there is no need to open another hole, and the detection end of the temperature probe extends to the vicinity of the conveying shaft, but does not contact the conveying shaft, and does not affect the normal rotation of the conveying shaft. The above-mentioned second grease nozzle is provided with a control valve, and the grease device is provided with a control system. The control valve and the temperature probe are both connected to the control system and controlled by the control system. Manual grease can be added through the first grease nozzle. Or when the temperature probe detects that the temperature of the grease cavity exceeds the set value, the grease device will open the control valve to automatically add grease. In order to facilitate disassembly and assembly, the second grease nozzle is threadedly connected to the grease device or connected through a threaded adapter.

[0046] The shaft sealing system of the wet sludge silo feeding screw in the above-mentioned examples can isolate the wet sludge in the silo by adding grease, and at the same time, the dry friction or boundary friction between the original skeleton oil seal and the main shaft is converted into liquid friction with a stable oil film, thereby enhancing the lubrication effect, reducing wear, extending the service life, and reducing production costs; reducing the frequency of shutdowns and maintenance, ensuring the stable operation of the wet sludge silo feeding screw, and after manual greasing once, it has been running continuously and stably without leakage for 10,000 hours; blocking the leakage of sludge, reducing on-site pollution, and improving the on-site appearance; further improving the degree of automation, saving labor, and greatly reducing the labor intensity of the team.

Claims

1. A shaft sealing system for a wet sludge silo feed screw, comprising a silo (1) and a conveying shaft (2), wherein the conveying shaft (2) extends from one end outside the silo (1) into the silo (1), and a spiral belt is provided on the conveying shaft (2) in the silo (1), characterized in that: It also includes a dust cover (3), a first skeleton oil seal (4), a second skeleton oil seal (5), a temperature probe (6) and a greasing device (7); The dust cover (3) is arranged outside the silo (1) and at the intersection of the silo (1) and the conveying shaft (2), and the end of the conveying shaft (2) passes through the dust cover (3) to connect with the driving device; the first skeleton oil seal (4) and the second skeleton oil seal (5) are both arranged on the conveying shaft (2) inside the dust cover (3), and a gap is left between the first skeleton oil seal (4) and the second skeleton oil seal (5) to form a grease cavity (31); the first skeleton oil seal (4) is arranged at the intersection of the silo (1) and the conveying shaft (2) inside the dust cover (3), and the second skeleton oil seal (5) is arranged at the intersection of the silo (1) and the conveying shaft (2) inside the dust cover (3); the first skeleton oil seal (4) is composed of more than three skeleton oil seals arranged in parallel, and the second skeleton oil seal (5) is composed of more than one skeleton oil seal arranged in parallel; the detection end of the temperature probe (6) extends into the grease cavity (31); A first grease nozzle (32) is provided at the top of the dust cover (3) corresponding to the grease cavity (31), and a movably connected sealing cover (34) is provided on the first grease nozzle (32); a second grease nozzle (33) is provided at the bottom of the dust cover (3) corresponding to the grease cavity (31), and a grease device (7) is connected to the second grease nozzle (33).

2. The shaft sealing system of the wet sludge silo feeding screw according to claim 1, characterized in that: The dust cover (3) is in the shape of a hollow cylinder. One end of the dust cover (3) in the circumferential direction is a connection end and the other end is a free end. A flange (35) is provided on the outer side of the connection end of the dust cover (3). The dust cover (3) is connected to the end of the silo (1) through the flange (35). The end of the conveying shaft (2) passes through the free end of the dust cover (3) and is connected to the driving device.

3. The shaft sealing system of the wet sludge silo feeding screw according to claim 2, characterized in that: The connecting end of the dust cover (3) is an open structure, and the connecting end of the dust cover (3) is sealed and fitted with the silo (1); the free end of the dust cover (3) is a closed end structure, and a through hole is provided in the center of the free end of the dust cover (3), and the end of the conveying shaft (2) passes through the through hole to connect with the driving device.

4. The shaft sealing system of the wet sludge silo feeding screw according to claim 2 or 3, characterized in that: The dust cover (3) is coaxially arranged with the conveying shaft (2).

5. The shaft sealing system for the wet sludge silo feed screw according to any one of claims 1 to 3, characterized in that: The first skeleton oil seal (4) is composed of three skeleton oil seals arranged in parallel, and the second skeleton oil seal (5) is composed of one skeleton oil seal; the outer ring of the first skeleton oil seal (4) and the outer ring of the second skeleton oil seal (5) are both transitionally matched with the inner wall of the dust cover (3), the inner ring of the first skeleton oil seal (4) and the inner ring of the second skeleton oil seal (5) are both clearance-matched with the conveying shaft (2), and the inner ring of the first skeleton oil seal (4) and the inner ring of the second skeleton oil seal (5) and the conveying shaft (2) are filled with a grease layer.

6. The shaft sealing system of the wet sludge silo feeding screw according to any one of claims 1 to 3, characterized in that: The detection end of the temperature probe (6) extends from the second grease nozzle (33) into the grease cavity (31).

7. The shaft sealing system for the wet sludge silo feed screw according to claim 6, characterized in that: The second greasing nozzle (33) is provided with a control valve (8), the greasing device (7) is provided with a control system, and the control valve (8) and the temperature probe (6) are both connected to the control system and controlled by the control system.

8. The shaft sealing system for the feeding screw of the wet sludge silo according to any one of claims 1 to 3, characterized in that: The second grease nozzle (33) is connected to the grease device (7) by threading or by a threaded adapter tube.

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