Sludge screw pump for efficient sealing

Abstract

The utility model provides a sludge screw pump for efficient sealing, which comprises a shell, a rotating transmission shaft arranged on the shell, one end of the transmission shaft connected with a connecting shaft, the other end of the transmission shaft connected with a motor, one end of the connecting shaft connected with a screw shaft, a sealing cover and a gland arranged on the transmission shaft, and a sealing device arranged between the sealing cover and the gland. The sealing device comprises a static ring and a sliding movable ring. According to the whole structure, the phenomenon that little leakage occurs when the sealing filler is used is avoided, so that leakage of the whole structure is reduced, the maintenance and repair frequency of the sludge screw pump is reduced, and the use efficiency of equipment is improved. According to the whole structure, the phenomena that the main shaft is abraded and the service life of the main shaft is shortened due to dry friction between the filler and the shaft caused by too tight extrusion of the filler are avoided, so that the service life of the whole structure is prolonged. And meanwhile, the overall structure avoids the problem that the use efficiency is low due to the fact that the pressing degree of the filler needs to be adjusted frequently when the filler is used for sealing.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a sludge screw pump for efficient sealing. Background Art

[0002] The existing sewage treatment plants are used for sludge transportation in sedimentation tanks. When sealing the shaft of the existing sludge screw pump, sealing packing is usually used. The sealing packing is generally made of relatively soft linear materials and filled into the sealing cavity by a strip with a square cross-section. After the packing is installed in the packing cavity, it is axially compressed by the gland screws. When there is relative movement between the shaft and the packing, due to the plasticity of the packing, it generates a radial force and closely contacts the shaft. At the same time, the lubricant impregnated in the packing is extruded to form an oil film between the contact surfaces. Since the contact state is not particularly uniform, the "boundary lubrication" state appears at the contact part, which is called the "bearing effect".

[0003] However, the existing packing seal of the sludge screw pump also has disadvantages. It is necessary to maintain good lubrication and appropriate compression. If the lubrication is poor or the compression is too tight, the oil film will be interrupted, resulting in dry friction between the packing and the shaft, and finally leading to shaft burning and serious wear. Therefore, it is necessary to frequently adjust the compression degree of the packing so that after the lubricant in the packing is lost during operation for a period of time, some more lubricant can be extruded, and at the same time, the relaxation of the compression force caused by the volume change of the packing can be compensated. In order to maintain the liquid film and take away the frictional heat, a small amount of leakage must occur at the packing. The lubricant leaking for a long time makes the surrounding environment dirty and messy, and the ground is seriously waterlogged, so it needs to be frequently cleaned. If the packing seal of the sludge screw pump is extruded too tightly, dry friction may also occur between the packing and the shaft, wearing the main shaft and reducing the service life of the main shaft. For this reason, we propose a sludge screw pump for efficient sealing to solve the above problems. Content of the Utility Model

[0004] The utility model provides a sludge screw pump for efficient sealing, which solves the problems that the packing seal of the sludge screw pump needs to frequently adjust the compression degree of the packing, the lubricant leaking for a long time makes the surrounding environment dirty and messy, the ground is seriously waterlogged and needs to be frequently cleaned, and it is easy to wear the main shaft and reduce the service life of the main shaft.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a sludge screw pump for efficient sealing, including a housing, a rotating transmission shaft is provided on the housing, one end of the transmission shaft is connected to a connecting shaft, the other end of the transmission shaft is connected to a motor, one end of the connecting shaft is connected to a screw shaft, a sealing cover and a gland are provided on the transmission shaft, and a sealing device is provided between the sealing cover and the gland. The sealing device includes a stationary ring and a sliding moving ring.

[0006] In a preferred embodiment, a coupling is provided between the transmission shaft and the motor. One end of the housing is provided with a discharge port, which is communicated with the screw shaft. A base is provided at the bottom of the housing, and both the motor and the discharge port end of the housing are mounted on the base.

[0007] In a preferred embodiment, one end of the housing is provided with a discharge barrel. A plurality of stators are provided on the screw shaft, and the stators are mounted on the discharge barrel of the housing. A plurality of tie rods are provided outside the discharge barrel.

[0008] In a preferred embodiment, universal joint assemblies are provided at both ends of the connecting shaft. The connecting shaft is connected to the screw shaft and the transmission shaft through the universal joint assemblies respectively. A suction port is provided on the housing at the top of the connecting shaft, and the suction port is communicated with the screw shaft.

[0009] In a preferred embodiment, a bearing seat is provided on the transmission shaft. A bearing cover is provided on one side of the bearing seat. A bushing is provided on the bearing seat, and a bearing is provided on the bushing. The bearing is connected to the transmission shaft, and the bearing seat is mounted on the base.

[0010] In a preferred embodiment, a ring groove is provided on the sealing cover. A side ring groove is provided on one side of the ring groove, and an annular stepped groove is provided on the other side of the ring groove.

[0011] In a preferred embodiment, a sealing ring is provided at one end of the stationary ring O-ring. A driving bolt is provided between the sealing ring and the moving ring. A spring seat is provided at the bottom of the moving ring, and a spring is provided between the spring seat and the moving ring.

[0012] In a preferred embodiment, the sealing ring, the driving bolt, the moving ring and the spring seat are all mounted on the side ring groove.

[0013] In a preferred embodiment, one end of the stationary ring abuts against the stepped groove. A stationary ring O-ring is provided between one end of the stationary ring and the sealing cover. The stationary ring O-ring abuts against the sealing ring. The cross-sections of the sealing ring and the moving ring are both L-shaped. A driving bolt is provided at one end of the sealing ring, and a flat bottom hole is provided on the moving ring. The convex rod of the driving bolt abuts against the flat bottom hole.

[0014] In a preferred embodiment, a moving ring O-ring is provided between the sealing ring and the transmission shaft. One end of the moving ring abuts against the moving ring O-ring. A guide rod is provided on the spring seat, and the spring is mounted on the guide rod. The spring abuts against the moving ring through a push ring. A bottom hole is provided at the bottom of the moving ring, and the guide rod is mounted in the bottom hole of the moving ring.

[0015] The beneficial effects of the present utility model are as follows: When the driving motor works, the transmission shaft, the connecting shaft and the screw shaft rotate in sequence to discharge sludge from the overall device. A spring seat is provided on the gland. A spring is provided between the moving ring and the spring seat. One end of the moving ring abuts against the spring, and the other end of the moving ring abuts against the O-ring of the moving ring. The O-ring of the moving ring abuts against the sealing ring, and the sealing ring contacts the stationary ring so that the moving ring can move relative to the stationary ring. The overall structure of the sealing device is an elastic element, and the moving ring can move relative to the stationary ring, which can play the roles of preloading, compensation and buffering, can automatically adjust the pressure between the moving ring and the stationary ring, and can compensate for the wear of the sealing surface.

[0016] The overall structure avoids the phenomenon of a small amount of leakage when using packing seals, so that the overall structure reduces leakage, reduces the maintenance and repair frequency of the sludge screw pump, and improves the use efficiency of the equipment. The overall structure will not have the phenomenon that dry friction occurs between the packing and the shaft due to excessive extrusion of the packing, wearing the main shaft and reducing the service life of the main shaft, so that the overall structure has a longer life. At the same time, the overall structure avoids the problem of low use efficiency caused by the need to frequently adjust the compression degree of the packing when using packing seals, and has great popularization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0018] Figure 1 is the axonometric view of the overall structure of the present utility model;

[0019] Figure 2 is the sectional view of the overall structure of the present utility model;

[0020] Figure 3 is the enlarged sectional view of the sealing device of the present utility model;

[0021] Figure 4 is the sectional view of the prior art packing seal of the present utility model;

[0022] In the figure: housing 1; discharge port 101; discharge barrel 102; pull rod 2; stator 3; screw shaft 4; universal joint assembly 5; suction port 6; connecting shaft 7; sealing cover 8; ring groove 801; side ring groove 802; stepped groove 803; sealing device 9; stationary ring O-ring 901; stationary ring 902; moving ring O-ring 903; sealing ring 904; moving ring 905; driving bolt 906; push ring 907; spring 908; guide rod 909; spring seat 910; bearing seat 10; bearing cover 11; motor 12; coupling 13; shaft sleeve 14; bearing 15; transmission shaft 16; base 17; gland 18. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiment 1:

[0024] As shown in Figures 1-4 In the figure, a sludge screw pump for efficient sealing includes a housing 1. A rotating transmission shaft 16 is provided on the housing 1. One end of the transmission shaft 16 is connected to a connecting shaft 7, and the other end of the transmission shaft 16 is connected to a motor 12. One end of the connecting shaft 7 is connected to a screw shaft 4. A sealing cover 8 and a gland 18 are provided on the transmission shaft 16. A sealing device 9 is provided between the sealing cover 8 and the gland 18. The sealing device 9 includes a stationary ring 902 and a sliding moving ring 905. With this structure, when the driving motor 12 works, the transmission shaft 16, the connecting shaft 7, and the screw shaft 4 rotate in sequence to discharge sludge from the overall device. A spring seat 910 is provided on the gland 18. A spring 908 is provided between the moving ring 905 and the spring seat 910. One end of the moving ring 905 abuts against the spring 908, and the other end of the moving ring 905 abuts against a moving ring O-ring 903. The moving ring O-ring 903 abuts against a sealing ring 904, and the sealing ring 904 contacts the stationary ring 902 so that the moving ring 905 can move relative to the stationary ring 902. The overall structure of the sealing device 9 is an elastic element. The moving ring 905 can move relative to the stationary ring 902, which can play roles of preloading, compensation, and buffering, can automatically adjust the pressure between the moving ring 905 and the stationary ring 902, and can compensate for the wear of the sealing surface.

[0025] The overall structure avoids the phenomenon of a small amount of leakage occurring when using sealing packing, so that the overall structure reduces leakage, reduces the maintenance and repair frequency of the sludge screw pump, and improves the use efficiency of the equipment. The overall structure will not have the phenomenon that due to the packing being squeezed too tightly, dry friction occurs between the packing and the shaft, wearing the main shaft and reducing the service life of the main shaft, so that the overall structure has an increased service life. At the same time, the overall structure avoids the problem of low use efficiency caused by the need to frequently adjust the compression degree of the packing when using packing seals.

[0026] In a preferred solution, a coupling 13 is provided between the transmission shaft 16 and the motor 12. An outlet 101 is provided at one end of the housing 1. The outlet 101 is communicated with the screw shaft 4. A base 17 is provided at the bottom of the housing 1. Both the motor 12 and the outlet 101 end of the housing 1 are installed on the base 17. With this structure, when the driving motor 12 works, the motor 12 outputs to the transmission shaft 16 through the coupling 13, so that the transmission shaft 16, the connecting shaft 7, and the screw shaft 4 rotate in sequence to discharge sludge from the overall device.

[0027] In a preferred solution, an outlet barrel 102 is provided at one end of the housing 1. A plurality of stators 3 are provided on the screw shaft 4. The stators 3 are installed on the outlet barrel 102 of the housing 1. A plurality of tie rods 2 are provided outside the outlet barrel 102.

[0028] In a preferred embodiment, universal joint assemblies 5 are provided at both ends of the connecting shaft 7. The connecting shaft 7 is connected to the screw shaft 4 and the transmission shaft 16 through the universal joint assemblies 5. An inlet 6 is provided on the housing 1 at the top of the connecting shaft 7, and the inlet 6 is communicated with the screw shaft 4. With this structure, the sludge enters through the inlet 6 on the housing 1 at the top of the connecting shaft 7 and is discharged from the discharge port 101 through the connecting shaft 7.

[0029] In a preferred embodiment, a bearing seat 10 is provided on the transmission shaft 16. A bearing cover 11 is provided on one side of the bearing seat 10. A bushing 14 is provided on the bearing seat 10. A bearing 15 is provided on the bushing 14, and the bearing 15 is connected to the transmission shaft 16. The bearing seat 10 is mounted on the base 17. With this structure, the discharge barrel 102, the bearing seat 10, and the motor 12 are all mounted on the base 17 to keep the overall structure stable.

[0030] In a preferred embodiment, a ring groove 801 is provided on the sealing cover 8. A side ring groove 802 is provided on one side of the ring groove 801, and an annular stepped groove 803 is provided on the other side of the ring groove 801. With this structure, the ring groove 801 is opened on the sealing cover 8 to facilitate the installation of the stationary ring 902, and the stepped groove 803 is opened on the side of the ring groove 801 to facilitate the stationary ring 902 to abut against the sealing cover 8.

[0031] In a preferred embodiment, a sealing ring 904 is provided at one end of the stationary ring O-ring 901. A driving bolt 906 is provided between the sealing ring 904 and the moving ring 905. A spring seat 910 is provided at the bottom of the moving ring 905, and a spring 908 is provided between the spring seat 910 and the moving ring 905. With this structure, a spring 908 is provided between the moving ring 905 and the spring seat 910. One end of the moving ring 905 abuts against the spring 908, the other end of the moving ring 905 abuts against the moving ring O-ring 903, the moving ring O-ring 903 abuts against the sealing ring 904, and the sealing ring 904 contacts the stationary ring 902, so that the moving ring 905 can move relative to the stationary ring 902. The overall structure of the sealing device 9 is an elastic element. The moving ring 905 can move relative to the stationary ring 902, which can play a role in preloading, compensation, and buffering, can automatically adjust the pressure between the moving ring 905 and the stationary ring 902, and can compensate for the wear of the sealing surface.

[0032] In a preferred embodiment, the sealing ring 904, the driving bolt 906, the moving ring 905, and the spring seat 910 are all mounted on the side ring groove 802.

[0033] In a preferred embodiment, one end of the stationary ring 902 abuts against the stepped groove 803. A stationary ring O-ring seal 901 is provided between one end of the stationary ring 902 and the sealing cover 8. The stationary ring O-ring seal 901 abuts against the sealing ring 904. The cross-sections of both the sealing ring 904 and the moving ring 905 are L-shaped. A driving bolt 906 is provided at one end of the sealing ring 904. The moving ring 905 is provided with a flat-bottom hole, and the protruding rod of the driving bolt 906 abuts against the flat-bottom hole. With this structure, the stationary ring O-ring seal 901 and the moving ring O-ring seal 903 provide an additional sealing effect and help the moving ring 905 move axially flexibly, automatically compensating for the wear of the sealing surface. The stationary ring 902 and the moving ring 905 of the overall structure have good wear resistance and sufficient floating ability to ensure good sealing performance.

[0034] In a preferred embodiment, a moving ring O-ring seal 903 is provided between the sealing ring 904 and the transmission shaft 16. One end of the moving ring 905 abuts against the moving ring O-ring seal 903. A guide rod 909 is provided on the spring seat 910. The spring 908 is installed on the guide rod 909. The spring 908 abuts against the moving ring 905 through the push ring 907. The bottom of the moving ring 905 is provided with a bottom hole, and the guide rod 909 is installed in the bottom hole of the moving ring 905. With this structure, the spring 908 abuts against the moving ring 905 through the push ring 907. When the moving ring 905 moves, the guide rod 909 abuts against the bottom hole of the moving ring 905, and at the same time, the protruding rod of the driving bolt 906 abuts against the flat-bottom hole. The moving ring 905 abuts against the sealing ring 904 with an L-shaped cross-section through the moving ring O-ring seal 903 and the driving bolt 906 respectively. The outer side of the moving ring 905 abuts against the outer side of the sealing ring 904 through the driving bolt 906, and the inner side of the moving ring 905 abuts against the inner side of the sealing ring 904 through the moving ring O-ring seal 903, so that the overall structure fits tightly for sealing.

[0035] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A sludge screw pump for efficient sealing, characterized by: The invention comprises a housing (1), wherein a rotating transmission shaft (16) is provided on the housing (1), one end of the transmission shaft (16) is connected to a connecting shaft (7), the other end of the transmission shaft (16) is connected to a motor (12), one end of the connecting shaft (7) is connected to a screw shaft (4), a sealing cover (8) and a pressure cover (18) are provided on the transmission shaft (16), a sealing device (9) is provided between the sealing cover (8) and the pressure cover (18), and the sealing device (9) comprises a stationary ring (902) and a sliding dynamic ring (905).

2. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: A coupling (13) is provided between the transmission shaft (16) and the motor (12); a discharge port (101) is provided at one end of the housing (1); the discharge port (101) is communicated with the screw shaft (4); a base (17) is provided at the bottom of the housing (1); and the discharge port (101) ends of the motor (12) and the housing (1) are both mounted on the base (17).

3. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: A discharge barrel (102) is provided at one end of the housing (1), a plurality of stators (3) are provided on the screw shaft (4), the stators (3) are mounted on the discharge barrel (102) of the housing (1), and a plurality of tie rods (2) are provided on the outside of the discharge barrel (102).

4. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: Universal joint assemblies (5) are provided at both ends of the connecting shaft (7), and the connecting shaft (7) is connected to the screw shaft (4) and the transmission shaft (16) via the universal joint assemblies (5). A suction port (6) is provided on the housing (1) located at the top of the connecting shaft (7), and the suction port (6) is communicated with the screw shaft (4).

5. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: A bearing seat (10) is provided on the transmission shaft (16), a bearing cover (11) is provided on one side of the bearing seat (10), a shaft sleeve (14) is provided on the bearing seat (10), a bearing (15) is provided on the shaft sleeve (14), the bearing (15) is connected to the transmission shaft (16), and the bearing seat (10) is mounted on a base (17).

6. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: The sealing cover (8) is provided with an annular groove (801), one side of the annular groove (801) is provided with a side annular groove (802), and the other side of the annular groove (801) is provided with an annular stepped groove (803).

7. The sludge screw pump for efficient sealing according to claim 1 is characterized in that: A sealing ring (904) is provided at one end of the stationary ring O-ring (901), a driving bolt (906) is provided between the sealing ring (904) and the moving ring (905), a spring seat (910) is provided at the bottom of the moving ring (905), and a spring (908) is provided between the spring seat (910) and the moving ring (905).

8. The sludge screw pump for efficient sealing according to claim 7 is characterized in that: The sealing ring (904), the driving bolt (906), the moving ring (905) and the spring seat (910) are all mounted on the side ring groove (802).

9. The sludge screw pump for efficient sealing according to claim 7, characterized in that: One end of the stationary ring (902) abuts against the stepped groove (803); a stationary ring O-type sealing ring (901) is provided between one end of the stationary ring (902) and the sealing cover (8); the stationary ring O-type sealing ring (901) abuts against the sealing ring (904); the cross-sections of the sealing ring (904) and the dynamic ring (905) are both L-shaped; a driving bolt (906) is provided at one end of the sealing ring (904); a flat-bottomed hole is provided on the dynamic ring (905); and a protruding rod of the driving bolt (906) abuts against the flat-bottomed hole.

10. The sludge screw pump for efficient sealing according to claim 7, characterized in that: A dynamic ring O-type sealing ring (903) is provided between the sealing ring (904) and the transmission shaft (16); one end of the dynamic ring (905) abuts against the dynamic ring O-type sealing ring (903); a guide rod (909) is provided on the spring seat (910); a spring (908) is mounted on the guide rod (909); the spring (908) abuts against the dynamic ring (905) through a push ring (907); a bottom hole is provided at the bottom of the dynamic ring (905); and the guide rod (909) is mounted on the bottom hole of the dynamic ring (905).

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