CN211598988U

CN211598988U - Melt gear pump

Info

Publication number: CN211598988U
Application number: CN201922230247.3U
Authority: CN
Inventors: 黄红涛; 徐文博
Original assignee: Zhengzhou Research Institute of Mechanical Engineering Co Ltd
Current assignee: Zhengzhou Research Institute of Mechanical Engineering Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-09-29
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a fuse-element gear pump, including casing, parallel arrangement in inside driving shaft of casing and driven shaft, locate front shroud and back shroud on the face of casing both ends respectively, suit respectively in driving shaft and driven epaxial intermeshing's driving gear and driven gear to and the suit is equipped with the drainage groove on the slide bearing of driving shaft and driven shaft, on the slide bearing's the terminal surface, lubricated runner is located the slide bearing hole, lubricated runner sets to reverse spiral shell form and end and is equipped with and has seted up the opening of bleeding, lubricated runner head end with the drainage groove links to each other, slide bearing's terminal surface still is equipped with and expands and melts the groove, expand to melt the tank bottom and be less than or with shells inner wall parallel and level with the dedendum circle parallel and level or be higher than the dedendum circle and expand to melt the groove concave surface degree. The utility model overcomes the phenomenon that the local pressure rises and the local material is stranded to the life of lubricating property and part has been improved.

Description

Melt gear pump

Technical Field

The utility model relates to a high temperature, high pressure, high viscosity fuse-element conveying equipment, in particular to fuse-element gear pump.

Background

The patent of the utility model relates to a carry fuse-element gear pump that high temperature, high pressure, high viscosity fuse-element were used of trades such as polyester, chemical fibre.

A melt gear pump for conveying high-temperature, high-pressure and high-viscosity melts in the plastic industry is a throat part on a melt conveying production line, is one of the most important key devices, and has great influence on product performance and enterprise operation cost due to service life and quality stability. The existing gear rotor of the common melt gear pump is mostly a straight gear or a single helical gear structure, the structure is simple and convenient to process and manufacture, but the overlap ratio of the straight gear structure is low, the fatigue strength of the gear is limited, materials are trapped in a gear tooth meshing area, and the flow pulsation and the noise are high during operation; the meshing axial force of the single helical tooth structure is large, the axial force pushes the end face of the gear shaft to be close to the end face of the sliding bearing, and fault phenomena such as dry friction, fit end face abrasion and the like can be generated in severe cases.

Secondly, in the melt gear pump, the bearings cannot be lubricated by adopting a lubricating oil or lubricating grease mode, the inner hole of the bearing arranged in the melt gear pump is in clearance fit with the outer peripheral surface of the shaft neck of the gear shaft, and the inner end surface of the bearing is in clearance fit with the tooth end surface of the gear shaft, and proper lubricating flow channels are needed among the matching surfaces to ensure that proper melt is used as a lubricating medium between the matching surfaces which run relatively, so that dry friction, sintering or gluing between the matching surfaces is avoided. At present, a lubricating flow channel adopted by a domestic melt gear pump bearing is mostly a cylindrical groove with a certain included angle with the axis of a gear shaft, the groove-shaped structure of the flow channel reduces the supporting surface of the bearing part of the gear shaft to a certain extent, and the gear shaft and the gear which reduce the supporting range of the gear shaft can produce extra inclination to influence the service life of the gear and increase the occurrence probability of dry friction of a sliding bearing and a shaft neck matching surface. Therefore, there is a need for improvement of the prior art to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a fuse-element gear pump realizes through following technical scheme particularly:

a fuse-element gear pump, including casing, parallel arrangement in inside driving shaft of casing and driven shaft, locate front shroud and back shroud on the face of casing both ends respectively, suit driving gear and driven gear in driving shaft and driven shaft intermeshing respectively to and the suit is equipped with the drainage groove on the slide bearing of driving shaft and driven shaft, the lubricated runner is located on the slide bearing hole, the lubricated runner sets to reverse spiral shell form and end and has seted up the opening that leaks, lubricated runner head end with the drainage groove links to each other, slide bearing's terminal surface still is equipped with and expands and melts the groove, expand to melt the tank bottom and be less than or with shells inner wall parallel and level with the dedendum circle parallel and level or be higher than the dedendum circle and expand groove concave surface degree of depth when the installation targets in place.

Preferably, the driving gear and the driven gear are both gears without a cutter-clearance-groove herringbone tooth structure.

Preferably, the melt expanding groove is one or a combination of an annular groove and a slope groove.

Preferably, the outer circumference of the sliding bearing is provided with a tangent plane parallel to the axis of the sliding bearing, and the tangent plane is provided with a fixing groove.

According to the prior scheme, the end face of the sliding bearing is further provided with an unloading groove, and the unloading groove and the drainage groove are arranged at a distance to block the connection of the unloading groove and the drainage groove.

Preferably, the end face of the sliding bearing is provided with a plurality of shallow grooves, and the shallow grooves are arranged on the end face of the sliding bearing in a radioactive manner.

The utility model has the advantages that: the gear with the herringbone tooth structure without the clearance groove of the utility model has the advantages that when in meshing, the high-pressure cavity melt of the melt gear pump is always communicated, and the phenomena of melt pressure rise and material local trapping in a closed meshing area when the straight gear is meshed or the single helical tooth is meshed can not occur; melt-gear pump, can not produce the meshing axial force during the meshing, and the teeth of a cogwheel can automatic centering, eliminate the error that resets of the teeth of a cogwheel when opening the machine of shutting down, avoid the teeth of a cogwheel terminal surface of gear shaft and the direct contact of slide bearing terminal surface, reduce the probability that the two fitting surface takes place troubles such as dry friction or wearing and tearing burn, improved melt-gear pump's reliability. Other advantageous effects of the present invention will be further described with reference to the following embodiments.

Drawings

The invention will be further described with reference to the following figures and examples:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial schematic view at the A-A section of a herringbone gear;

FIG. 3 is a schematic view of a sliding bearing structure

In the figure: 1. a housing; 2. is a gasket; 3. a hot coal medium port; 4. a front cover plate; 5. a gasket; 6. A high pressure side; 7. a low pressure side; 8. a seal ring; 9. an oil filling port; 10. a first axial sealing means; 11. a driving shaft 12, a first bolt; 13. a second bolt; 14. a second axial sealing device; 15. the device comprises a first sliding bearing 16, a driven shaft 17, a herringbone gear without a cutter clearance groove 18 and a second sliding bearing; 19. a rear cover plate; 20. a shaft shoulder; 21. a drainage groove; 22. a reverse spiral lubrication flow channel; 23. a bleed port; 24. shallow slot, 25, unloading slot; 26. a melt expanding groove; 27. and fixing the grooves.

Detailed Description

As shown in the figure: the utility model relates to a melt gear pump, which comprises a shell 1, a driving shaft 11 and a driven shaft 16 which are arranged in the shell in parallel, a front cover plate 4 and a rear cover plate 19 which are respectively arranged on the two end surfaces of the shell 1, a driving gear and a driven gear which are respectively sleeved on the driving shaft 11 and the driven shaft 16 and are mutually meshed, and a first sliding bearing 15 and a second bearing 18 which are sleeved on the driving shaft and the driven shaft, wherein the end surfaces of the first sliding bearing 15 and the second bearing 18 are provided with drainage grooves 21, the lubricating flow passage 22 is arranged on an inner hole of the sliding bearing, the lubricating flow passage 22 is arranged in a reverse spiral shape, the tail end of the lubricating flow passage 22 is provided with a drainage port 23, the head end of the lubricating flow passage 22 is connected with the drainage groove 21, the end face of the sliding bearing is also provided with a melt expanding groove 26, and the bottom of the melt expanding groove 26 is flush with the root circle or higher than the root circle, and the depth of the concave surface of the melt expanding groove 26 is lower than or flush with the inner wall of the shell when the slide bearing is installed in place.

The utility model discloses a melt gear pump, its first slide bearing 15, the interior terminal surface and the hole of second slide bearing 18's bearing are provided with special lubrication flow channel 22, lubrication flow channel 22 is seted up near melt gear pump high-pressure chamber, and not directly communicate with unloading groove 25, can introduce the fuse-element of melt gear pump high-pressure area into the cooperation region of bearing hole and gear shaft axle journal through terminal surface drainage groove 21, first slide bearing 15, second slide bearing 18's terminal surface drainage groove 21 does not directly communicate with unloading groove 25, the pressure pulsation that the meshing change arouses has reduced the pressure fluctuation that the fuse-element that serves as the lubricating medium causes in the lubrication region, the stability of lubricating medium film thickness has been improved; under the rotation of the gear shaft, the melt in the reverse spiral lubrication flow passage 22 arranged in the inner holes of the first sliding bearing 15 and the second sliding bearing 18 is more easily brought into the matching area of the gear shaft journal and the bearing inner hole, and the lubrication effect of the melt pump is improved; the reverse spiral lubrication flow passages 22 of the bearing inner holes of the first sliding bearing 15 and the second sliding bearing 18 do not reduce the supporting range of the gear shaft on the circumference, the supporting state of the gear shaft is better than the groove-shaped supporting effect of a cylindrical surface, an inclined surface and the like, no matter in work or in the starting and stopping process of equipment, the gear shaft cannot generate extra inclination due to the arrangement of the reverse spiral lubrication flow passages 22, and the occurrence probability of dry friction of matching surfaces is reduced; the back surfaces of the first sliding bearing 15 and the second sliding bearing 18 are provided with a small leakage port 23 at the tail end of the inner flow passage of the bearing, so that the lubricating melt is guided to flow into a low-pressure cavity of the melt gear pump to form a slow and complete melt lubricant flow passage, the denaturation caused by long-time stagnation of the melt is avoided, and the quality of a pumped product is improved.

The driving gear and the driven gear are all herringbone gears 17 without cutter grooves. The herringbone gear structure without the clearance grooves can be a combined herringbone gear which can be separated, can also be an integral herringbone gear structure without the clearance grooves, and the rotor shaft of the herringbone gear structure can also be an integral structure and a separated assembly structure shown in figure 1. When the melt gear pump operates, included angles of herringbone teeth are meshed firstly, then the herringbone teeth gradually extend to two ends along with the rotation of the driving shaft 11 and the driven shaft 16, and the gear tooth end faces of the herringbone gears 17 without the cutter grooves do not use completely closed high-pressure cavities in meshing areas, so that melts in the high-pressure cavities cannot be trapped by the meshing areas, the local pressure change is small, and the output flow pulsation of the melt gear pump is small; the herringbone gear 17 can select a larger helical angle, the end face contact ratio is increased to a certain extent, and the effects of reducing the meshing impact, reducing the running noise and increasing the bearing capacity of the gear teeth are achieved. The left and right rotating directions of the herringbone gear 17 are opposite, the spiral angles are the same, axial forces generated by meshing can be mutually offset, self-adaptive centering of a driving gear shaft consisting of the driving shaft 11 sleeved with the herringbone gear 17 without the cutter groove and a driven gear shaft consisting of the driven shaft 16 sleeved with the herringbone gear 17 without the cutter groove can be realized when the gear teeth are meshed, the reset error of the gear teeth during shutdown is eliminated, the direct contact between the gear tooth end surface of the gear shaft and the end surface of the sliding bearing is avoided, the probability of faults such as dry friction or abrasion burning and the like of the matching surface of the gear teeth and the sliding bearing is reduced, and the reliability of the melt.

Further, the melt expanding groove 26 is one or a combination of two of an annular groove and a slope groove, the bottom of the melt expanding groove 26 is not lower than the gear shaft root circle, and the depth of the concave surface is not more than the inner wall of the shell when the melt expanding groove is installed in place. When the melt gear pump works, particularly when the inlet pressure of the melt gear pump is in a vacuum state, the sucked melt can be fully infiltrated and covers tooth groove gaps of the low-pressure cavity, the suction effect of the high-viscosity melt is improved, and the efficiency of the melt gear pump is further improved. The melt gear pump can store and timely suck more new melts when being started, so that dry friction and sintering phenomena between the tooth tops of the gear shafts and the inner wall of the shell are avoided, and the service life of the melt gear pump is prolonged.

Furthermore, the outer circumference of the sliding bearing is provided with a tangent plane parallel to the axis of the sliding bearing, and the tangent plane is provided with a fixing groove. When the first sliding bearing 15 and the second sliding bearing 18 are assembled together, a proper fixing pin or a key bar is arranged in the fixing groove 27, so that the installation and adjustment positions of the first sliding bearing 15 and the second sliding bearing 18 can be fixed, and the rotation dislocation or the skew between the first sliding bearing 15 and the second sliding bearing 18 can not occur in the work, so that the axis of the meshing herringbone gear 17 deviates from the parallel state, the partial offset load of the tooth surface is caused, the gluing or pitting risk is increased, and the service life of the gear is further shortened.

Further, the end face of the sliding bearing is also provided with an unloading groove 25, and the unloading groove 25 and the drainage groove 21 are arranged at a distance to block the connection. The relief groove 25 allows for relief of high pressure melt entering the gear mesh enclosure.

Furthermore, a plurality of shallow grooves 24 are formed on the bearing end surfaces of the first sliding bearing 15 and the second sliding bearing 18, and the plurality of shallow grooves 24 are radially arranged on the end surfaces of the sliding bearings. The shallow groove 24 can store a certain amount of lubricating melt, improve the lubricating effect of the end face and reduce the phenomena of dry friction, burning or gluing of the end face.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a fuse-element gear pump, includes casing, parallel arrangement in inside driving shaft and the driven shaft of casing, locates front shroud and back shroud on casing both ends face respectively, respectively the suit driving gear and the driven gear of intermeshing on driving shaft and driven shaft to and the suit in the slide bearing of driving shaft and driven shaft, its characterized in that: be equipped with the drainage groove on slide bearing's the terminal surface, be equipped with lubricated runner on the slide bearing hole, lubricated runner sets to reverse spiral shell form and end and is equipped with and has seted up the drainage mouth, lubricated runner head end with the drainage groove links to each other, slide bearing's terminal surface still is equipped with and expands the molten bath, expand the molten bath bottom and root circle parallel and level or be higher than the root circle and expand the molten bath concave surface degree of depth and be less than or with shells inner wall parallel and level when the installation targets in place.

2. The melt gear pump of claim 1, wherein: the driving gear and the driven gear are both gears without a cutter-clearance-groove herringbone tooth structure.

3. The melt gear pump of claim 1, wherein: the melt expanding groove is one or the combination of an annular groove and a slope groove.

4. The melt gear pump of claim 1, wherein: the outer circumference of the sliding bearing is provided with a tangent plane parallel to the axis of the sliding bearing, and the tangent plane is provided with a fixing groove.

5. The melt gear pump of claim 1, wherein: the end face of the sliding bearing is also provided with an unloading groove, and the unloading groove and the drainage groove are arranged at a distance to block the connection.

6. The melt gear pump of any one of claims 1-4, wherein: the end face of the sliding bearing is provided with a plurality of shallow grooves which are arranged in a radial mode on the end face of the sliding bearing.