A sealing device and a delivery apparatus

Abstract

The application provides a sealing device and a conveying device. The sealing device comprises a packing sleeve, a first gland, a second gland and an elastic member. The first and second glands are respectively located at the two axial ends of the packing sleeve and are used for pressing the packing in the packing sleeve. The packing sleeve is fixedly connected with the first gland. There is a gap between the packing sleeve and the second gland in the axial direction. The elastic member provides the packing sleeve with an elastic force towards the gap. The packing sleeve is connected with the second gland and can move axially towards the gap relative to the second gland under the elastic force of the elastic member. The sealing device can automatically compensate for the wear of the packing, avoid the problem of leakage as soon as the packing is worn, prolong the replacement cycle of the packing and reduce the use cost. The conveying device simultaneously performs material sealing and packing sealing on the spiral feeding shaft, which can better avoid the leakage of compressed gas in the warehouse pump.

Description

Technical Field

[0001] This application relates to the field of material conveying technology, and in particular to a sealing device and conveying equipment. Background Technology

[0002] Some conveying equipment relies on the positive pressure of the silo pump and the rotation of the screw feed shaft to transport materials. The screw feed shaft is equipped with sealing devices at both ends. In the existing technology, the sealing devices at both ends of the screw feed shaft of such conveying equipment are very prone to leakage, which leads to frequent replacement or maintenance and high operating costs. Utility Model Content

[0003] To reduce usage costs, this application provides a sealing device comprising a packing sleeve, a first pressure cap, a second pressure cap, and an elastic element. The first and second pressure caps are located at opposite axial ends of the packing sleeve and are used to press against the packing inside the packing sleeve. The packing sleeve is fixedly connected to the first pressure cap, and there is an axial gap between the packing sleeve and the second pressure cap. The elastic element provides the packing sleeve with an elastic force toward the gap. The packing sleeve is connected to the second pressure cap, and the packing sleeve can move axially toward the gap relative to the second pressure cap under the action of the elastic force of the elastic element.

[0004] In one embodiment of the sealing device, the sealing device includes an adjusting bolt and an adjusting nut. The adjusting bolt passes through a through hole on the packing sleeve and is screwed into a threaded hole on the second gland. The adjusting nut is screwed to the adjusting bolt and is located on the side of the packing sleeve away from the gap. The elastic element is pre-compressed between the packing sleeve and the adjusting nut.

[0005] In one embodiment of the sealing device, the second gland includes a second pressure sleeve, the outer peripheral surface of the second pressure sleeve being guided and engaged with the inner peripheral surface of the packing sleeve to guide the packing sleeve to move axially.

[0006] In one embodiment of the sealing device, a sealing groove is provided on the outer circumferential surface of the second pressure sleeve and / or the inner circumferential surface of the packing sleeve, and a sealing ring is installed in the sealing groove to seal the gap between the outer circumferential surface of the second pressure sleeve and the inner circumferential surface of the packing sleeve.

[0007] In one embodiment of the sealing device, an oil reservoir ring is provided inside the packing sleeve, the oil reservoir ring has an oil reservoir cavity, and the packing inside the packing sleeve is arranged in two groups, with the two groups of packing located at the two axial ends of the oil reservoir ring respectively.

[0008] In one embodiment of the sealing device, the oil storage chamber has openings on both the inner and outer circumferential surfaces of the oil storage ring.

[0009] This application also provides a conveying device, which includes a silo pump, a screw feed shaft, a first pipe and a second pipe connected to both sides of the silo pump. A sealing device as described above is respectively provided at the end of the first pipe away from the silo pump and at the end of the second pipe away from the silo pump. The second pressure caps of the two sealing devices are respectively sealed and fixedly connected to the first pipe and the second pipe. The screw feed shaft passes through the interior of one sealing device, the first pipe, the silo pump, the second pipe and the other sealing device in sequence.

[0010] In one embodiment of the conveying device, the conveying device includes a sealing ring, the sealing ring being sleeved around the outer periphery of the spiral feeding shaft and fixedly connected to the spiral feeding shaft, and a sealing sleeve being provided at the end of the second pressure cover away from the first pressure cover, wherein the sealing ring and the sealing sleeve are interlocked axially to form a labyrinth channel.

[0011] In one embodiment of the conveying equipment, the sealing ring is provided with multiple ring portions spaced apart radially, and the sealing sleeve is inserted axially into the gap between adjacent ring portions. One axial end of each multi-ring portion is provided with an end plate and a connecting sleeve extending axially away from the end plate in a direction away from the multi-ring portion. The connecting sleeve is fixedly connected to the spiral feeding shaft.

[0012] One embodiment of the conveying equipment includes a balance pipe and a fluidizing pipe, the balance pipe connecting the first connecting pipe and the silo pump, and the fluidizing pipe located inside the silo pump and above the screw feed shaft.

[0013] In one embodiment of the above-mentioned sealing device, since the packing sleeve is fixedly connected to the first gland and there is an axial gap between the packing sleeve and the second gland, the elastic element applies an elastic force to the packing sleeve toward the gap. The packing sleeve is connected to the second gland, and under the action of the elastic force of the elastic element, the packing sleeve can move axially toward the gap relative to the second gland. Therefore, when the packing wears, the packing sleeve will automatically move axially toward the gap relative to the second gland under the action of the elastic force of the elastic element. When the packing sleeve moves, the first gland fixedly connected to it will move along with it, thereby shortening the axial distance between the first gland and the second gland. This can automatically compensate for the wear of the packing, avoid the problem of leakage when the packing wears, extend the replacement cycle of the packing, and reduce the cost of use.

[0014] In one embodiment of the above-mentioned conveying equipment, the spiral feeding shaft is simultaneously sealed with labyrinth material and packing, which can effectively prevent the leakage of compressed gas in the silo pump. Attached Figure Description

[0015] Figure 1 A cross-sectional view of one embodiment of the sealing device provided in this application;

[0016] Figure 2 A cross-sectional view of one embodiment of the conveying device provided in this application;

[0017] Figure 3 for Figure 2 Enlarged view of the area within the dashed circle on the left side of the middle section;

[0018] Figure 4 for Figure 2 Enlarged view of the area within the dashed circle on the right side of the middle section;

[0019] Figure 5 of Figure 3 and Figure 4 Enlarged view of the central sealing ring.

[0020] The annotations in the attached figures are explained as follows:

[0021] 100 Sealing device, 101 Packing sleeve, 101a Sleeve body, 101b First flange plate, 101c Second flange plate, 102 First gland, 102a First gland sleeve, 102b First gland plate, 103 Second gland, 103a Second gland sleeve, A Sealing groove, 103b Second gland plate, 103c Transition section, B Receiving chamber, 103d Sealing sleeve, 104 Elastic element, 105 Adjusting bolt, 106 Adjusting nut, 107 Sealing ring, 108 Oil reservoir ring, C Oil reservoir, 109 Packing;

[0022] 200 silo pump, 300 first connecting pipe, 301 first branch pipe, 302 first connecting pipe flange, 303 second branch pipe, 400 second connecting pipe, 401 second connecting pipe flange, 500 screw feed shaft, 600 first bearing assembly, 700 second bearing assembly, 800 sealing ring, 801 ring part, 802 end plate, 803 connecting sleeve, 900 balance pipe, 1000 fluidizing pipe, 1100 motor, 1200 coupling, 1300 sealing gasket. Detailed Implementation

[0023] To make this application clearer, the following is in conjunction with the appendix. Figure 1-5 Specific embodiments will be described below.

[0024] like Figure 1 As shown, the sealing device 100 includes at least a packing sleeve 101, a first gland 102, a second gland 103, and an elastic element 104. In the figure, the elastic element 104 is a helical spring, but it is not limited to a helical spring.

[0025] The first gland 102 and the second gland 103 are located at the two axial ends of the packing sleeve 101, respectively. When the packing sleeve 101 is filled with packing 109, the first gland 102 and the second gland 103 can respectively press against the two axial ends of the packing 109. It should be noted that when this sealing device 100 is sold, the packing sleeve 101 may or may not be filled with packing 109.

[0026] The packing sleeve 101 is fixedly connected to the first gland 102. In the illustrated embodiment, the first gland 102 includes a first gland 102a and a first gland plate 102b disposed at one axial end of the first gland 102a. The packing sleeve 101 includes a sleeve body 101a, a first flange plate 101b located at one axial end of the sleeve body 101a, and a second flange plate 101c located at the other axial end of the sleeve body 101a. The first flange plate 101b and the first gland plate 102b are fixedly connected by threaded fasteners, thereby achieving a fixed connection between the packing sleeve 101 and the first gland 102. Of course, the fixed connection method between the packing sleeve 101 and the first gland 102 is not limited to this; any method that can connect the two and fix their relative positions is acceptable, for example, the two can also be welded.

[0027] There is an axial gap D between the packing sleeve 101 and the second gland 103. In the illustrated embodiment, the gap D is located between the second flange plate 101c of the packing sleeve 101 and the transition portion 103c of the second gland 103.

[0028] The elastic element 104 provides the packing sleeve 101 with an elastic force toward the gap D. The packing sleeve 101 is connected to the second pressure cap 103. The packing sleeve 101 can move axially toward the gap D relative to the second pressure cap 103 under the action of the elastic force of the elastic element 104. In the illustrated embodiment, the second pressure cap 103 includes a second pressure sleeve 103a, a transition portion 103c disposed at one axial end of the second pressure sleeve 103a, a second pressure cap plate 103b disposed on the outer periphery of the transition portion 103c, and a sealing sleeve 103d disposed at one end of the second pressure cap 103 away from the first pressure cap 102. The transition portion 103c is bent, and the transition portion 103c and the second pressure sleeve 103a together form a receiving chamber B, which can accommodate at least part of the packing sleeve 101, thereby reducing the overall volume of the device. The adjusting bolt 105 passes through the through hole on the second flange plate 101c of the packing sleeve 101 and is screwed into the threaded hole on the transition portion 103c of the second pressure cap 103. The adjusting nut 106 is screwed onto the adjusting bolt 105. The adjusting nut 106 is located on the side of the second flange plate 101c away from the gap D. That is, in the axial direction, the gap D and the adjusting nut 106 are located on opposite sides of the second flange plate 101c. The elastic element 104 is pre-compressed between the adjusting nut 106 and the second flange plate 101c of the packing sleeve 101. In this way, the connection between the packing sleeve 101 and the second gland 103 is achieved, and the elastic element 104 can provide elastic force to the packing sleeve 101 towards the gap D. The adjusting nut 106 serves both to connect the packing sleeve 101 and the second gland 103 and to compress the elastic element 104. It has multiple functions, which simplifies the structure. Moreover, the pressure on the packing 109 can be adjusted by rotating the adjusting nut 106. It should be noted that the connection method between the packing sleeve 101 and the second gland 103 is not limited to this, as long as they can be kept axially connected and the packing sleeve 101 can move relative to the second gland 103 axially toward the gap D. Alternatively, the elastic element 104 can be compressed using a separate clamping structure instead of the adjusting nut 106.

[0029] In the aforementioned sealing device 100, since the packing sleeve 101 is fixedly connected to the first pressure cap 102, and there is an axial gap D between the packing sleeve 101 and the second pressure cap 103, the elastic element 104 provides the packing sleeve 101 with an elastic force toward the gap D. The packing sleeve 101 is connected to the second pressure cap 103, and the packing sleeve 101 can move axially toward the gap D relative to the second pressure cap 103 under the action of the elastic force of the elastic element 104. Therefore, when the packing 109 wears, the packing sleeve 101 will automatically move axially toward the gap D relative to the second pressure cap 103 under the action of the elastic force of the elastic element 104. When the packing sleeve 101 moves, the first pressure cap 102, which is fixedly connected to it, will move along with it, thereby shortening the axial distance between the first pressure cap 102 and the second pressure cap 103. This can automatically compensate for the wear of the packing 109, avoid the problem of leakage when the packing 109 wears out, extend the replacement cycle of the packing 109, and reduce the operating cost of the sealing device 100.

[0030] The sealing device 100 described above is equipped with an adjusting bolt 105 and an adjusting nut 106. The adjusting bolt 105 passes through the through hole on the packing sleeve 101 and is screwed into the threaded hole on the second pressure plate 103. The adjusting nut 106 is located on the side of the packing sleeve 101 away from the gap D. The adjusting nut 106 and the packing sleeve 101 cooperate to compress the elastic element 104. Therefore, the pressure on the packing 109 can be adjusted by rotating the adjusting nut 106, so that the compression degree of the packing 109 is adjustable.

[0031] Specifically, in the illustrated embodiment, the second pressure sleeve 103a of the second pressure cap 103 extends axially, and one axial end of the second pressure sleeve 103a is located inside the sleeve body 101a of the packing sleeve 101 to press against the packing 109 inside the sleeve body 101a. The outer peripheral surface of the second pressure sleeve 103a is guided and engaged with the inner peripheral surface of the packing sleeve 101 to guide the packing sleeve 101 to move axially and prevent leakage caused by deviation of the moving direction of the packing sleeve 101 from the axial direction.

[0032] Specifically, in the illustrated embodiment, a sealing groove A is provided on the outer peripheral surface of the second pressure sleeve 103a, and a sealing ring 107 is installed in the sealing groove A. The sealing ring 107 seals the gap between the outer peripheral surface of the second pressure sleeve 103a and the inner peripheral surface of the sleeve body 101a of the packing sleeve 101. Alternatively, the sealing groove A can also be provided on the inner peripheral surface of the sleeve body 101a, or the sealing groove A can be provided on both the outer peripheral surface of the second pressure sleeve 103a and the inner peripheral surface of the sleeve body 101a.

[0033] Specifically, in the illustrated embodiment, the packing sleeve 101 is provided with an oil reservoir ring 108, which has an oil reservoir cavity C. The packing 109 inside the packing sleeve 101 is arranged in two groups, located at the two axial ends of the oil reservoir ring 108 respectively. The lubricating grease stored in the oil reservoir cavity C can lubricate the packing 109, thereby helping to reduce the wear of the packing 109. In the figure, the oil reservoir cavity C has openings on both the inner and outer circumferential surfaces of the oil reservoir ring 108, which improves the lubrication effect on the packing 109. It should be noted that when this sealing device 100 is sold, the packing sleeve 101 may or may not have the oil reservoir ring 108 assembled inside.

[0034] like Figure 2 As shown, the conveying equipment provided in this application includes at least a silo pump 200, a screw feed shaft 500, a first connecting pipe 300 and a second connecting pipe 400 connected to both sides of the silo pump 200. A sealing device 100 is provided at the end of the first connecting pipe 300 away from the silo pump 200 and at the end of the second connecting pipe 400 away from the silo pump 200, respectively. The second caps 103 of the two sealing devices 100 are respectively sealed and fixedly connected to the first connecting pipe 300 and the second connecting pipe 400. The screw feed shaft 500 passes through one sealing device 100, the first connecting pipe 300, the silo pump 200, the second connecting pipe 400, and the other sealing device 100 in sequence. The sealing device 100 and the screw feed shaft 500 are sealed by the packing 109 inside the packing sleeve 101.

[0035] In the illustrated embodiment, as Figure 3 and Figure 4 As shown, the first connecting pipe 300 has a first connecting pipe flange 302 at the end away from the silo pump 200, and the second connecting pipe 400 has a second connecting pipe flange 401 at the end away from the silo pump 200. The first connecting pipe flange 302 and the second pressure plate 103b of the second pressure plate 103 of the sealing device 100 at the same end are connected by threaded fasteners, and a sealing gasket 1300 is provided between the first connecting pipe flange 302 and the second pressure plate 103b, thereby achieving a sealed and fixed connection between the second pressure plate 103 and the first connecting pipe 300. The second connecting pipe flange 401 and the second pressure plate 103b of the second pressure plate 103 of the sealing device 100 at the same end are connected by threaded fasteners, and a sealing gasket 1300 is provided between the second connecting pipe flange 401 and the second pressure plate 103b, thereby achieving a sealed and fixed connection between the second pressure plate 103 and the second connecting pipe 400. The method of sealing and fixing the second pressure plate 103 with the first connecting pipe 300 or the second connecting pipe 400 is not limited to this; for example, a sealed and fixed connection can also be achieved by circumferential welding.

[0036] In the illustrated embodiment, as Figure 2As shown, a first branch pipe 301 is provided on one side of the first connecting pipe 300, and the material conveyed by the screw feed shaft can be discharged from the first branch pipe 301. A second branch pipe 303 is provided on one side of the first connecting pipe 300, and the second branch pipe 303 is connected to the inside of the silo pump 200 through the balance pipe 900. The connection point is preferably located in the upper area of ​​the silo pump 200.

[0037] In the illustrated embodiment, as Figure 3 and Figure 4 As shown, a first bearing assembly 600 and a second bearing assembly 700 are respectively connected to both axial ends of the screw feed shaft 500. Each bearing assembly includes a bearing, a bearing housing, and bearing covers located at both axial ends of the bearing housing. The bearing in the first bearing assembly 600 is preferably an angular contact bearing, and the bearing in the second bearing assembly 700 is preferably a self-aligning bearing. The bearing housing, the second pressure plate 103b at the same end, and the first connecting flange 302 of the first bearing assembly 600 are connected by the same threaded fastener. The bearing housing, the second pressure plate 103b at the same end, and the second connecting flange 401 of the second bearing assembly 700 are connected by the same threaded fastener.

[0038] In the illustrated embodiment, as Figure 2 As shown, the silo pump 200 is equipped with a fluidizing pipe 1000, which is located above the screw feed shaft 500. The screw feed shaft 500 extends approximately horizontally. One end of the screw feed shaft 500 near the second bearing assembly 700 is connected to the motor 1100 via a coupling 1200, and the motor 1100 can drive the screw feed shaft 500 to rotate around its own axis.

[0039] In the illustrated embodiment, as Figure 3 , Figure 4 and Figure 5 As shown, the conveying device includes a sealing ring 800, which is fitted around the outer circumference of the screw feed shaft 500 and fixedly connected to it. A sealing sleeve 103d is provided at the end of the second pressure plate 103 of the sealing device 100 away from the first pressure plate 102. The sealing sleeve 103d and the sealing ring 800 are axially interlocked, forming a labyrinth channel between them. In this way, the labyrinth channel can be filled by the conveyed material, thereby forming a material seal. The combination of the material seal and the packing seal can better prevent compressed gas leakage within the silo pump 200.

[0040] In the illustrated embodiment, as Figure 5 As shown, the sealing ring 800 has two ring portions 801 arranged radially at intervals. One end of each ring portion 801 has an end plate 802 and a connecting sleeve 803 extending axially away from the end plate 802 in a direction away from the ring portion 801. Figure 3 and Figure 4As shown, the connecting sleeve 803 is fixed to the spiral feed shaft 500 by locking screws. The sealing sleeve 103d of the second pressure cover 103 has a single-layer structure. The sealing sleeve 103d is inserted axially into the gap between the two ring portions 801 of the sealing ring 800, thereby forming a channel between the sealing sleeve 103d and the outer ring portion 801 of the sealing ring 800, and another channel between the sealing sleeve 103d and the inner ring portion 801 of the sealing ring 800. The two channels are connected at one axial end, forming a labyrinth channel. It should be noted that the sealing ring 800 may also have one ring portion 801 or two or more ring portions 801. In this application, "multiple layers" refers to two or more layers. When the sealing ring 800 has only one ring portion 801, the sealing sleeve 103d needs to be arranged radially with two or more sleeves spaced apart, and the ring portion 801 is inserted into the gap between adjacent sleeves. When the sealing ring 800 is provided with two or more ring parts 801, the sealing sleeve 103d can be a single-layer structure, or it can be provided with two or more sleeves in a radially spaced manner.

[0041] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A sealing device, characterized in that, The sealing device (100) includes a packing sleeve (101), a first pressure cap (102), a second pressure cap (103), and an elastic element (104). The first pressure cap (102) and the second pressure cap (103) are located at opposite ends of the packing sleeve (101) and are used to press against the packing (109) inside the packing sleeve (101). The packing sleeve (101) is fixedly connected to the first pressure cap (102). There is an axial gap (D) between the packing sleeve (101) and the second pressure cap (103). The elastic element (104) applies an elastic force to the packing sleeve (101) toward the gap (D). The packing sleeve (101) is connected to the second pressure cap (103). The packing sleeve (101) can move axially toward the gap (D) relative to the second pressure cap (103) under the action of the elastic force of the elastic element (104).

2. The sealing device according to claim 1, characterized in that, The sealing device (100) includes an adjusting bolt (105) and an adjusting nut (106). The adjusting bolt (105) passes through a through hole on the packing sleeve (101) and is screwed into a threaded hole on the second pressure cap (103). The adjusting nut (106) is screwed into the adjusting bolt (105). The adjusting nut (106) is located on the side of the packing sleeve (101) away from the gap (D). The elastic element (104) is pre-compressed between the packing sleeve (101) and the adjusting nut (106).

3. The sealing device according to claim 1, characterized in that, The second gland (103) includes a second gland (103a), the outer peripheral surface of which is guided and engaged with the inner peripheral surface of the packing sleeve (101) to guide the packing sleeve (101) to move axially.

4. The sealing device according to claim 3, characterized in that, A sealing groove (A) is provided on the outer circumferential surface of the second pressure sleeve (103a) and / or the inner circumferential surface of the packing sleeve (101). A sealing ring (107) is installed in the sealing groove (A) and the sealing ring (107) seals the gap between the outer circumferential surface of the second pressure sleeve (103a) and the inner circumferential surface of the packing sleeve (101).

5. The sealing device according to any one of claims 1-4, characterized in that, The packing sleeve (101) is provided with an oil storage ring (108), the oil storage ring (108) has an oil storage cavity (C), and the packing (109) in the packing sleeve (101) is arranged in two groups, the two groups of packing (109) are respectively located at the two axial ends of the oil storage ring (108).

6. The sealing device according to claim 5, characterized in that, The oil storage cavity (C) has openings on both the inner and outer circumferential surfaces of the oil storage ring (108).

7. A conveying device, characterized in that, The conveying equipment includes a silo pump (200), a screw feed shaft (500), a first pipe (300) and a second pipe (400) connected to both sides of the silo pump (200). A sealing device (100) as described in any one of claims 1-6 is provided at the end of the first pipe (300) away from the silo pump (200) and the end of the second pipe (400) away from the silo pump (200). The second caps (103) of the two sealing devices (100) are respectively sealed and fixedly connected to the first pipe (300) and the second pipe (400). The screw feed shaft (500) passes through the interior of one sealing device (100), the first pipe (300), the silo pump (200), the second pipe (400), and the other sealing device (100) in sequence.

8. The conveying device according to claim 7, characterized in that, The conveying device includes a sealing ring (800), which is sleeved on the outer periphery of the screw feed shaft (500) and fixedly connected to the screw feed shaft (500). A sealing sleeve (103d) is provided at the end of the second pressure cover (103) away from the first pressure cover (102). The sealing ring (800) and the sealing sleeve (103d) are interlocked axially to form a labyrinth channel.

9. The conveying device according to claim 8, characterized in that, The sealing ring (800) is provided with multiple ring portions (801) arranged radially at intervals. The sealing sleeve (103d) is inserted axially into the gap between adjacent ring portions (801). One axial end of each multi-ring portion (801) is provided with an end plate (802) and a connecting sleeve (803) extending axially away from the end plate (802) in a direction away from the multi-ring portion (801). The connecting sleeve (803) is fixedly connected to the spiral feeding shaft (500).

10. The conveying device according to any one of claims 7-9, characterized in that, The conveying device includes a balance pipe (900) and a fluidizing pipe (1000). The balance pipe (900) connects the first connecting pipe (300) and the silo pump (200). The fluidizing pipe (1000) is located inside the silo pump (200) and above the screw feed shaft (500).

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