High-temperature single-suction double-screw pump

Abstract

The utility model discloses a high-temperature single-suction double-screw pump which comprises a pump body and a bearing seat, a connecting plate is connected to the front end of the pump body, a rear cover is installed at the rear end of the pump body, an outlet pipe is arranged on the rear cover, a mechanical seal is installed on the connecting plate, a driving shaft and a driven shaft penetrate through the mechanical seal, and a front cover is installed at the front end of the bearing seat. The double-row angular contact ball bearings are matched with the driving shaft and the driven shaft respectively, single-row cylindrical roller bearings matched with the driving shaft and the driven shaft respectively are installed at the rear end of the bearing seat, the front end of the driving shaft is sleeved with a first gear, the front end of the driven shaft is sleeved with a second gear, and the portions, located in the pump body, of the rear end of the driving shaft and the rear end of the driven shaft are sleeved with threaded sleeves. An inlet pipe is arranged at the position, close to the front end of the pump body, of the side face of the pump body, and the front end of the driving shaft penetrates through the front cover. A water cooling cavity is formed in the outer side of the pump body and provided with a water inlet and a water outlet. The high-temperature single-suction double-screw pump can keep the temperature of the pump cavity at a normal level.

Description

Technical Field

[0001] The utility model relates to a screw pump, and more specifically, to a high-temperature single-suction twin-screw pump. Background Art

[0002] A screw pump is a pump that uses the rotation of a screw to suck and discharge liquid, and it belongs to a type of positive-displacement pump. The working principle of a screw pump is to achieve transportation by squeezing the liquid. They can effectively handle various fluids, including viscous liquids, liquids containing solid particles, and liquids with certain lubricity. Screw pumps can be divided into single-screw pumps, twin-screw pumps, and triple-screw pumps according to the number of screws.

[0003] Taking the twin-screw pump as an example, when the medium in the pump body of the twin-screw pump flows, it will generate friction with the inner wall of the pump cavity. Under this flow friction, heat will be generated. As time goes by, the temperature will gradually rise, causing the pressure in the pump cavity to increase. With the increase in pressure, it will pose a safety hazard to the sealed pump body. Therefore, it is necessary to effectively dissipate heat from the pump body so that the pump cavity can be at a safe temperature level. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-temperature single-suction twin-screw pump. The high-temperature single-suction twin-screw pump enables the pump cavity to be at a safe temperature level and protects the safety of the pump body by arranging a water-cooling cavity outside the pump body.

[0005] To achieve the above purpose, the utility model provides a high-temperature single-suction twin-screw pump, which includes a pump body installed at the rear end of a support seat and a bearing seat installed at the front end of the support seat. A connecting plate is connected to the front end of the pump body, and a rear cover is installed at the rear end. An outlet pipe is arranged on the rear cover. A mechanical seal is installed on the connecting plate. A driving shaft and a driven shaft are arranged in parallel through the mechanical seal. A front cover is installed at the front end of the bearing seat. Double-row angular contact ball bearings respectively cooperating with the driving shaft and the driven shaft are also installed at the front end of the bearing seat. Single-row cylindrical roller bearings respectively cooperating with the driving shaft and the driven shaft are installed at the rear end of the bearing seat. A first gear is sleeved on the front end of the driving shaft. A second gear meshing with the first gear is sleeved on the front end of the driven shaft. Screw sleeves are sleeved on the rear ends of the driving shaft and the driven shaft located inside the pump body. The two screw sleeves have opposite spiral directions and mesh with each other. An inlet pipe is arranged at a position near the front end of the side of the pump body. The front end of the driving shaft penetrates through the front cover, and a second flat key is arranged on the side of the front end of the driving shaft. A water-cooling cavity is arranged outside the pump body, and a water inlet and a water outlet are arranged outside the water-cooling cavity.

[0006] Preferably, the rear cover is installed at the rear end of the pump body through a plurality of second screws, and a first spring washer pressing on the rear end of the pump body is sleeved on the second screws.

[0007] Preferably, first flat keys for anti-fooling cooperation with the screw sleeve are respectively arranged on the rear side surfaces of the driving shaft and the driven shaft. First retaining rings for pressing the corresponding screw sleeves are installed at the rear ends of the driving shaft and the driven shaft through bolts, and second spring washers pressing on the first retaining rings are sleeved on the bolts.

[0008] Preferably, a cover plate is installed on the top of the bearing seat through a plurality of first screws.

[0009] Preferably, a first bearing gland is installed at the rear end of the bearing seat through a plurality of sixth screws. Eighth spring washers pressing on the first bearing gland are sleeved on the sixth screws, and second skeleton oil seals sleeving the driving shaft and the driven shaft respectively are arranged on the first bearing gland; a second bearing gland is installed at the front end of the bearing seat through a plurality of third screws, and fifth spring washers pressing on the second bearing gland are sleeved on the third screws.

[0010] Preferably, the connecting plate is fixed to the front end of the pump body through a plurality of circumferentially arranged seventh screws, and ninth spring washers pressing on the connecting plate are sleeved on the seventh screws.

[0011] Preferably, a through hole for installing the mechanical seal is arranged on the connecting plate, the rear end of the mechanical seal is inserted into the through hole, a plurality of stud bolts are arranged along the circumference at the front end of the connecting plate, and the outer ends of the stud bolts lock and fix the mechanical seal through first nuts.

[0012] Preferably, a positioning ring nested in the through hole is arranged at the rear end of the connecting plate; the rear end of the positioning ring is installed on the connecting plate through a plurality of eighth screws, and third spring washers pressing on the positioning ring are sleeved on the eighth screws.

[0013] Preferably, the front cover is installed on the bearing seat through a plurality of fifth screws at the front end of the bearing seat, and seventh spring washers pressing on the bearing seat are sleeved on the fifth screws.

[0014] According to the above technical solution, the present utility model provides a high-temperature single-suction twin-screw pump, which includes a pump body installed at the rear end of a support seat and a bearing seat installed at the front end of the support seat. A connecting plate is connected to the front end of the pump body, and a rear cover is installed at the rear end. An outlet pipe is provided on the rear cover. A mechanical seal is installed on the connecting plate, and a driving shaft and a driven shaft arranged in parallel penetrate through the mechanical seal. A front cover is installed at the front end of the bearing seat, and double-row angular contact ball bearings respectively cooperating with the driving shaft and the driven shaft are also installed at the front end of the bearing seat. Single-row cylindrical roller bearings respectively cooperating with the driving shaft and the driven shaft are installed at the rear end of the bearing seat. A first gear is sleeved on the front end of the driving shaft, and a second gear meshing with the first gear is sleeved on the front end of the driven shaft. Screw sleeves are sleeved on the rear ends of the driving shaft and the driven shaft located inside the pump body. The two screw sleeves have opposite spiral directions and mesh with each other. An inlet pipe is provided at a position near the front end of the side surface of the pump body. The front end of the driving shaft penetrates through the front cover, and a second flat key is provided on the side surface of the front end of the driving shaft. A water-cooling cavity is arranged outside the pump body, and a water inlet and a water outlet are arranged outside the water-cooling cavity.

[0015] The working principle and beneficial effects of this high-temperature single-suction twin-screw pump are as follows: During use, an external driving motor is connected to the front end of the driving shaft and is anti-fool positioned through the second flat key. The driving motor rotates to drive the driving shaft to rotate. Under the meshing action of the first gear and the second gear, the driven shaft is driven to rotate, thereby driving the rotation of two screw sleeves with opposite spiral directions. Since the two screw sleeves mesh with each other, the medium is more stable during the transfer process, and the medium is transferred from the inlet pipe to the outlet pipe. This high-temperature single-suction twin-screw pump is integrally supported by a support seat. The lower end of the connecting plate is integrally connected to the support seat, and the bearing seat is also integrally connected to the support seat. A space convenient for operation is formed between the connecting plate and the bearing seat. When disassembling and assembling, the pump body and the bearing seat can be independently carried out, making the overall disassembly and assembly more convenient. Two sets of rotating support structures are provided at the front end and the rear end of the bearing seat, that is, the driving shaft and the driven shaft are rotationally supported respectively by single-row cylindrical roller bearings and double-row angular contact ball bearings, making the driving shaft and the driven shaft more stable when rotating, so that the screw sleeves can convey the medium in a stable state. By arranging a water-cooling cavity outside the pump body, the pump cavity can be at a safe temperature level to protect the safety of the pump body.

[0016] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0017] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0018] Figure 1 It is a schematic cross-sectional view of a preferred embodiment of a high-temperature single-suction twin-screw pump;

[0019] Figure 2 It is a front view of a preferred embodiment of a high-temperature single-suction twin-screw pump.

[0020] Explanation of reference numerals

[0021] 1 - Rear cover; 2 - First retaining ring; 3 - Driving shaft; 4 - Pump body; 5 - Driven shaft; 6 - Positioning ring; 7 - Connecting plate; 8 - Cover plate; 9 - First bearing gland; 10 - Sleeve; 11 - Bearing housing; 12 - Retaining ring; 13 - First gear; 14 - Front cover; 15 - Second gear; 16 - Bush; 17 - Second retaining ring; 18 - Second bearing gland; 20 - Support seat; 21 - First screw; 22 - Outlet pipe; 23 - Inlet pipe; 24 - Water-cooling chamber; 25 - Water inlet; 26 - First nut; 27 - Bolt; 28 - Second spring washer; 29 - First flat key; 30 - Mechanical seal; 31 - Water outlet; 32 - Third spring washer; 33 - Stud; 34 - Fourth spring washer; 35 - Single-row cylindrical roller bearing; 36 - Double-row angular contact ball bearing; 37 - Third screw; 38 - Fifth spring washer; 39 - Round nut; 40 - Lock washer; 41 - Third flat key; 42 - First skeleton oil seal; 43 - Fourth screw; 44 - Sixth spring washer; 45 - Second flat key; 46 - First spring washer; 47 - Fifth screw; 48 - Seventh spring washer; 49 - Second skeleton oil seal; 50 - Sixth screw; 51 - Eighth spring washer; 52 - Seventh screw; 53 - Ninth spring washer; 54 - Eighth screw; 56 - Second screw. Specific embodiments

[0022] The following further elaborates on the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0023] In the present invention, unless otherwise stated, the directional terms such as "up and down, left and right, front and back, inside and outside" included in the terms only represent the directions of the terms in their normal use states, or are commonly known to those skilled in the art, and should not be regarded as a limitation to the terms.

[0024] See Figure 1-2The high-temperature single-suction twin-screw pump shown includes a pump body 4 installed at the rear end of a support seat 20 and a bearing housing 11 installed at the front end of the support seat 20. A connecting plate 7 is connected to the front end of the pump body 4, and a rear cover 1 is installed at the rear end. An outlet pipe 22 is provided on the rear cover 1. A mechanical seal 30 is installed on the connecting plate 7. A driving shaft 3 and a driven shaft 5 arranged in parallel penetrate through the mechanical seal 30. A front cover 14 is installed at the front end of the bearing housing 11. Double-row angular contact ball bearings 36 respectively cooperating with the driving shaft 3 and the driven shaft 5 are also installed at the front end of the bearing housing 11. Single-row cylindrical roller bearings 35 respectively cooperating with the driving shaft 3 and the driven shaft 5 are installed at the rear end of the bearing housing 11. A first gear 13 is sleeved on the front end of the driving shaft 3. A second gear 15 meshing with the first gear 13 is sleeved on the front end of the driven shaft 5. Screw sleeves 10 are sleeved on the rear ends of the driving shaft 3 and the driven shaft 5 located inside the pump body 4. The two screw sleeves 10 have opposite spiral directions and mesh with each other. An inlet pipe 23 is provided at a position near the front end on the side surface of the pump body 4. The front end of the driving shaft 3 penetrates through the front cover 14. A second flat key 45 is provided on the side surface of the front end of the driving shaft 3. A water-cooling cavity 24 is provided outside the pump body 4. An inlet 25 and an outlet 31 are provided outside the water-cooling cavity 24.

[0025] By implementing the above technical solution, during use, an external driving motor is connected to the front end of the driving shaft 3 and anti-fooling positioning is carried out through the second flat key 45. When the driving motor rotates, it drives the driving shaft 3 to rotate. Under the meshing action of the first gear 13 and the second gear 15, the driven shaft 5 is driven to rotate, thereby driving the two screw sleeves 10 with opposite spiral directions to rotate. Since the two screw sleeves 10 mesh with each other, the medium is more stable during the transfer process, and the medium is transferred from the inlet pipe 23 to the outlet pipe 22. The high-temperature single-suction twin-screw pump is integrally supported by the support seat 20. The lower end of the connecting plate 7 is integrally connected to the support seat 20, and the bearing housing 11 is also integrally connected to the support seat 20. A space convenient for operation is formed between the connecting plate 7 and the bearing housing 11. When disassembling and assembling, the pump body 4 and the bearing housing 11 can be carried out independently, making the overall disassembly and assembly more convenient. Two sets of rotating support structures are provided at the front end and the rear end of the bearing housing 11, that is, the driving shaft 3 and the driven shaft 5 are respectively rotationally supported by the single-row cylindrical roller bearing 35 and the double-row angular contact ball bearing 36, making the driving shaft 3 and the driven shaft 5 more stable when rotating, so that the screw sleeve 10 can convey the medium in a stable state. By providing the water-cooling cavity 24 outside the pump body 4, the pump cavity can be at a safe temperature level, protecting the safe operation of the pump body 4.

[0026] In the present utility model, a first skeleton oil seal 42 is provided at the position where the front cover 14 is rotationally fitted with the driving shaft 3. A second retaining ring 17 is provided at the front end of the driven shaft 5, and the second retaining ring 17 is pressed tightly by screws. A bushing 16 is further provided between the driven shaft 5 and the second gear 15. The fourth screw 43 passes through the sixth spring washer 44 and the shoulder surface of the bushing 16 and is then screwed onto the second gear 15. In addition, a retaining ring 12 is sleeved on the driving shaft 3 between the double-row angular contact ball bearing 36 and the first gear 13 to limit the position between the two. A round nut 39 is screwed onto the front end of the driving shaft 3, and a stop washer 40 is sleeved between the round nut 39 and the first gear 13 to press and limit the first gear 13. Third flat keys 41 are provided on the front side surfaces of the front ends of the driving shaft 3 and the driven shaft 5 respectively, and are in anti-fooling cooperation with the corresponding first gear 13 or second gear 15 to ensure the stable operation of the first gear 13 or the second gear 15.

[0027] In this embodiment, in order to further provide an installation method for the rear cover 1, the rear cover 1 is installed at the rear end of the pump body 4 by a plurality of second screws 56, and a first spring washer 46 that presses against the rear end of the pump body 4 is sleeved on the second screws 56.

[0028] In this embodiment, first flat keys 29 for anti-fooling cooperation with the screw sleeves 10 are respectively provided on the rear side surfaces of the rear ends of the driving shaft 3 and the driven shaft 5. The rear ends of the driving shaft 3 and the driven shaft 5 are both installed with first retaining rings 2 for pressing the corresponding screw sleeves 10 by bolts 27, and second spring washers 28 that press against the first retaining rings 2 are sleeved on the bolts 27. In this way, the screw sleeves 10 are installed and positioned. Of course, shoulder surfaces for stopping the corresponding screw sleeves 10 are also provided at positions close to the rear ends of the driving shaft 3 and the driven shaft 5, and are cooperated with the bolts 27 for locking.

[0029] In this embodiment, a cover plate 8 is installed on the top of the bearing seat 11 by a plurality of first screws 21. Through the setting of the cover plate 8, the structural stability of the bearing seat 11 is increased, and at the same time, the cover plate 8 is used as a flat platform for installing other auxiliary structures.

[0030] In this embodiment, a first bearing gland 9 is mounted at the rear end of the bearing housing 11 by a plurality of sixth screws 50. An eighth spring washer 51 that presses against the first bearing gland 9 is sleeved on the sixth screw 50. A second skeleton oil seal 49 that respectively sleeves the driving shaft 3 and the driven shaft 5 is arranged on the first bearing gland 9. A second bearing gland 18 is mounted at the front end of the bearing housing 11 by a plurality of third screws 37. A fifth spring washer 38 that presses against the second bearing gland 18 is sleeved on the third screw 37. Through such an arrangement, the first bearing gland 9 and the second bearing gland 18 are respectively mounted at the rear end and the front end of the bearing housing 11 to limit the position of the single-row cylindrical roller bearing 35, increase the structural stability, and at the same time, the second skeleton oil seal 49 can prevent impurities from entering the single-row cylindrical roller bearing 35 and improve the sealing performance at the single-row cylindrical roller bearing 35.

[0031] In this embodiment, in order to further provide a connection mode between the connecting plate 7 and the front end of the pump body 4, the connecting plate 7 is fixed to the front end of the pump body 4 by a plurality of circumferentially arranged seventh screws 52. A ninth spring washer 53 that presses against the connecting plate 7 is sleeved on the seventh screw 52.

[0032] In this embodiment, a through hole for mounting the mechanical seal 30 is arranged on the connecting plate 7. The rear end of the mechanical seal 30 is inserted into the through hole. A plurality of studs 33 are arranged on the front end of the connecting plate 7 in the circumferential direction. The outer end of the stud 33 locks and fixes the mechanical seal 30 through a first nut 26. Through such an arrangement, an installation mode of the mechanical seal 30 is provided, so that the mechanical seal 30 is in sealing fit with the driving shaft 3 and the driven shaft 5, and the sealing performance of the pump body 4 is increased. In addition, a fourth spring washer 34 is sleeved between the front end of the stud 33, the first nut 26 and the mechanical seal 30.

[0033] In this embodiment, in order to facilitate the installation and positioning of the connecting plate 7, a positioning ring 6 nested in the through hole is arranged at the rear end of the connecting plate 7. The rear end of the positioning ring 6 is mounted on the connecting plate 7 by a plurality of eighth screws 54. A third spring washer 32 that presses against the positioning ring 6 is sleeved on the eighth screw 54. Before connecting the pump body 4 and the connecting plate 7, the positioning ring 6 is first mounted on the connecting plate 7 by a plurality of eighth screws 54, and then when connecting the pump body 4 and the connecting plate 7, positioning is performed through the protruding part at the rear end of the positioning ring 6 and the front end of the pump body 4.

[0034] In this embodiment, in order to further provide a mounting method for the front cover 14, the front end of the bearing housing 11 mounts the front cover 14 on the bearing housing 11 through a plurality of fifth screws 47, and a seventh spring washer 48 that presses on the bearing housing 11 is sleeved on the fifth screw 47. An annular structure extends outward from the front end of the bearing housing 11, and the fifth screw 47 penetrates forward through this annular structure and inserts into a corresponding mounting hole on the front cover 14.

[0035] The specific process of heat dissipation of the pump body 4 in the present utility model is as follows: Cooling water enters the water cooling chamber 24 through the water inlet 25, and then discharges from the water outlet 31, enters the cooling water circulation pump arranged outside for cooling, and then enters the water inlet 25, so as to circulate like this.

[0036] This high-temperature single-suction double-screw pump has the advantages of high temperature resistance, split design for easy disassembly and assembly, good self-sealing performance, basically no pulsation in flow rate and pressure, smooth operation, small wear of rotating parts, convenient disassembly and assembly, long service life, high efficiency, etc. In addition, by adding a water cooling structure, it has high temperature resistance performance and reliable use performance.

[0037] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, and these simple modifications all fall within the protection scope of the present utility model.

[0038] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any appropriate way. In order to avoid unnecessary repetition, the present utility model will not separately describe various possible combination methods.

[0039] In addition, any combination can be made between various different embodiments of the present utility model as long as it does not violate the idea of the present utility model, and it should also be regarded as the content disclosed by the present utility model.

Claims

1. A high-temperature single-suction twin-screw pump, characterized in that, It includes a pump body (4) installed at the rear end of a support base (20) and a bearing housing (11) installed at the front end of the support base (20). A connecting plate (7) is connected to the front end of the pump body (4), and a rear cover (1) is installed at the rear end. An outlet pipe (22) is provided on the rear cover (1). A mechanical seal (30) is installed on the connecting plate (7), and a driving shaft (3) and a driven shaft (5) arranged in parallel penetrate through the mechanical seal (30). A front cover (14) is installed at the front end of the bearing housing (11). Double row angular contact ball bearings (36) respectively cooperating with the driving shaft (3) and the driven shaft (5) are also installed at the front end of the bearing housing (11). Single row cylindrical roller bearings (35) respectively cooperating with the driving shaft (3) and the driven shaft (5) are installed at the rear end of the bearing housing (11). A first gear (13) is sleeved on the front end of the driving shaft (3), and a second gear (15) meshing with the first gear (13) is sleeved on the front end of the driven shaft (5). Screw sleeves (10) are sleeved on the rear ends of the driving shaft (3) and the driven shaft (5) which are located inside the pump body (4). The two screw sleeves (10) have opposite spiral directions and mesh with each other. An inlet pipe (23) is provided at a position near the front end of the side surface of the pump body (4). The front end of the driving shaft (3) penetrates through the front cover (14), and a second flat key (45) is provided on the side surface of the front end of the driving shaft (3). A water cooling cavity (24) is provided outside the pump body (4), and a water inlet (25) and a water outlet (31) are provided outside the water cooling cavity (24).

2. The high-temperature single-suction double-screw pump according to claim 1, wherein The rear cover (1) is installed at the rear end of the pump body (4) through a plurality of second screws (56), and a first spring washer (46) pressing against the rear end of the pump body (4) is sleeved on the second screws (56).

3. The high-temperature single-suction double-screw pump according to claim 1, characterized in that, First flat keys (29) for anti-fooling cooperation with the screw sleeves (10) are respectively provided on the side surfaces of the rear ends of the driving shaft (3) and the driven shaft (5). The rear ends of the driving shaft (3) and the driven shaft (5) are both installed with first retaining rings (2) for pressing the corresponding screw sleeves (10) through bolts (27), and second spring washers (28) pressing against the first retaining rings (2) are sleeved on the bolts (27).

4. The high-temperature single-suction double-screw pump according to claim 1, characterized in that, A cover plate (8) is installed at the top of the bearing housing (11) through a plurality of first screws (21).

5. The high-temperature single-suction double-screw pump according to claim 1, characterized in that, A first bearing gland (9) is installed at the rear end of the bearing housing (11) through a plurality of sixth screws (50). Eighth spring washers (51) pressing against the first bearing gland (9) are sleeved on the sixth screws (50), and second skeleton oil seals (49) respectively sleeving the driving shaft (3) and the driven shaft (5) are provided on the first bearing gland (9). A second bearing gland (18) is installed at the front end of the bearing housing (11) through a plurality of third screws (37), and fifth spring washers (38) pressing against the second bearing gland (18) are sleeved on the third screws (37).

6. The high-temperature single-suction double-screw pump according to claim 1, wherein The connecting plate (7) is fixed to the front end of the pump body (4) by a plurality of seventh screws (52) arranged circumferentially, and a ninth spring washer (53) that presses on the connecting plate (7) is sleeved on the seventh screw (52).

7. The high-temperature single-suction double-screw pump according to claim 1, wherein A through hole for installing the mechanical seal (30) is provided on the connecting plate (7); The rear end of the mechanical seal (30) is inserted and arranged in the through hole. A plurality of studs (33) are arranged circumferentially at the front end of the connecting plate (7), and the outer ends of the studs (33) lock and fix the mechanical seal (30) through a first nut (26).

8. The high-temperature single-suction double-screw pump according to claim 7, wherein A positioning ring (6) nested in the through hole is provided at the rear end of the connecting plate (7); The rear end of the positioning ring (6) is installed on the connecting plate (7) by a plurality of eighth screws (54), and a third spring washer (32) that presses on the positioning ring (6) is sleeved on the eighth screw (54).

9. The high-temperature single-suction double-screw pump according to claim 1, characterized in that The front end of the bearing seat (11) installs the front cover (14) on the bearing seat (11) through a plurality of fifth screws (47), and a seventh spring washer (48) that presses on the bearing seat (11) is sleeved on the fifth screw (47).

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