Melt gear pump sliding bearing and melt gear pump

Abstract

The utility model discloses a melt gear pump sliding bearing and a melt gear pump. The melt gear pump sliding bearing comprises a sliding bearing body, and the sliding bearing body comprises a lubricating oil groove, and the lubricating oil groove is a spiral groove. The melt gear pump sliding bearing of the utility model has a better lubrication effect because the spiral groove of the lubricating oil groove is no longer a straight groove structure under the current technology; the circular arc transition structure of the oil groove can avoid the collision of sharp edges between the gear shaft and the sliding bearing during operation to produce burrs, thereby avoiding the burrs, scratches, and even pump jams on the gear shaft and the bearing; the wear-resistant coating has good wear resistance and a low friction coefficient, which solves the problem of parts being torn due to friction for gear pumps with rotational motion and friction motion.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a melt gear pump sliding bearing and a melt gear pump. Background Art

[0002] During the operation of the gear shaft and the sliding bearing of the melt gear pump, the two end faces of the gear will contact and generate friction with the working surface of the sliding bearing; the outer circle of the gear shaft will contact and generate rotational motion with the hole of the sliding bearing. In this case, heat will be generated due to friction. Although the gear pump is self-lubricated by the working medium, it is easy to cause the friction and rotating parts of the parts to be scratched and scratched when the working pressure is relatively high or the viscosity of the working medium is low. In severe cases, the pump will be stuck, which is not allowed.

[0003] Especially for some working media (such as green fiber solution), the friction between the gear shaft and the sliding bearing will cause temperature rise. If the temperature rise exceeds the range, an explosion will occur. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies and defects of the prior art and to provide a melt gear pump sliding bearing and a melt gear pump.

[0005] One aspect of the utility model provides a melt gear pump sliding bearing, comprising a sliding bearing body, wherein the sliding bearing body comprises a lubricating oil groove, and the lubricating oil groove is a spiral groove.

[0006] Wherein, the intersection or connection position between the lubricating oil groove and the bearing hole of the sliding bearing body forms a first arc transition connection structure.

[0007] There is an end surface oil groove on the end surface of the sliding bearing body, and a second arc transition structure is formed between the side surface of the end surface oil groove in the length direction and the end surface of the sliding bearing body.

[0008] Wherein, a third arc transition structure is formed between the two sides of the lubricating oil groove and the inner surface of the bearing hole of the sliding bearing body.

[0009] Wherein, the sliding bearing body comprises a working surface, the surface of which is provided with a wear-resistant coating, and the working surface is the end surface that contacts each other when the sliding bearing body and the gear shaft are combined together for working.

[0010] Wherein, the wear-resistant coating is a DLC coating.

[0011] Wherein, the lubricating oil groove is a double-layer spiral groove, including a first spiral groove and a second spiral groove, and the first spiral groove and the second spiral groove are arranged in steps and connected together.

[0012] Wherein, the width of the first spiral groove is greater than the width of the second spiral groove and the depth of the first spiral groove is greater than the depth of the second spiral groove.

[0013] Among them, one end of the first spiral groove away from the second spiral groove is connected to the first end face of the sliding bearing body, and one end of the second spiral groove away from the first spiral groove is connected to the second end face of the sliding bearing body, and the first end face is arranged opposite to the second end face.

[0014] Another aspect of the utility model provides a melt gear pump, comprising the melt gear pump sliding bearing described in one aspect of the utility model.

[0015] The melt gear pump sliding bearing of the utility model has a spiral groove of the lubricating oil groove instead of a straight groove structure under the current technology, so that the lubrication effect is better.

[0016] In addition, a first arc transition connection structure is formed at the intersection or connection position between the lubricating oil groove and the bearing hole of the sliding bearing body, and / or the end face of the sliding bearing body has an end face oil groove, and a second arc transition structure is formed between the side surface in the length direction of the end face oil groove and the end face of the sliding bearing body, and / or a third arc transition structure is formed between the two sides of the lubricating oil groove and the inner surface of the bearing hole of the sliding bearing body, which can avoid the situation where the sharp edges of the gear shaft and the sliding bearing collide and produce burrs during operation, thereby avoiding the situation where the gear shaft and the bearing are burred, scratched, or even stuck in the pump.

[0017] In addition, the sliding bearing body includes a working surface, and the surface of the working surface is arranged with a wear-resistant coating. The working surface is the end surface that contacts each other when the bearing body and the gear shaft are combined to work together. The wear resistance of the wear-resistant coating is quite good. At the same time, the friction coefficient is low. For gear pumps with rotational motion and friction motion, the problem of parts damage due to friction is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the sliding bearing of the melt gear pump of the utility model.

[0019] Figure 2 It is a front view of the melt gear pump sliding bearing of the utility model.

[0020] Figure 3 for Figure 2 Cross-section along line ww.

[0021] Figure 4 It is an axonometric view of the melt gear pump sliding bearing of the utility model.

[0022] Figure 5It is a front view of a gear shaft used in conjunction with the sliding bearing of the melt gear pump of the utility model.

[0023] Figure 6 This is an axonometric view of the sliding bearing of a melt gear pump using current technology. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the sliding bearing of the melt gear pump of the embodiment of the utility model comprises a sliding bearing body 20, wherein the sliding bearing body comprises a lubricating oil groove 25, and the lubricating oil groove 25 is a spiral groove.

[0026] In the prior art, the lubricating oil groove in the sliding bearing hole is a straight oil groove 250, see Figure 6 As shown, in the present application, the straight oil groove is changed into a spiral groove, which has a better lubrication effect and can better play a lubrication role.

[0027] In some embodiments, the intersection or connection position between the lubricating oil groove and the bearing hole 23 of the sliding bearing body 20 forms a first arc transition connection structure 26. In some embodiments, the end face of the sliding bearing body has an end face oil groove 24, and the side surface in the length direction of the end face oil groove 24 and the end face of the sliding bearing body 20 (the working surface of the sliding bearing body 20) form a second arc transition structure 27. In some embodiments, the two sides of the lubricating oil groove 25 and the inner surface of the bearing hole 23 of the sliding bearing body 20 form a third arc transition structure 28.

[0028] Under the prior art, see Figure 6 As shown, both sides of the straight oil groove, both sides of the end face oil groove, and the intersection of the straight oil groove and the end face oil groove are all sharp edge structures. In the present application, the corresponding side edges and the sharp edges of the connection positions are directly processed into arc transitions, which can avoid the situation where the gear shaft and the sliding bearing collide with each other during operation to produce burrs, thereby avoiding the situation where the gear shaft and the bearing are burred, scratched, or even stuck in the pump.

[0029] It should be noted that in this application, the sliding bearing 20 is used in conjunction with the gear shaft 10 of the melt gear pump, see Figure 5As shown, the gear shaft 10 is a rod body with a stepped shaft structure, with a large diameter portion 12 in the middle, and the two ends of the large diameter portion 12 are end face working surfaces 13 that cooperate with the sliding bearing, and the shaft body close to the end face working surface 13 is an outer cylindrical working surface 11 that cooperates with the bearing hole of the sliding bearing 20. When in use, the two sliding bearings 20 are sleeved on the shaft body 11, and their working surfaces 21 are in contact with the end face working surface 13, and their bearing holes 23 cooperate with the outer cylindrical working surface 11 of the shaft body.

[0030] From the above, it can be seen that the utility model optimizes the lubricating oil groove of the sliding bearing of the melt gear pump, and changes the straight oil groove into a spiral groove to make the lubrication effect better. In addition, further, all the sharp edges of the oil groove are changed into arc transitions to eliminate the risks of sharp edge collision, burring and flanging between the bearing and the gear shaft during rotation.

[0031] Wherein, the sliding bearing body 20 includes a working surface 21, the surface of which is provided with a wear-resistant coating (not shown), and the working surface 21 is the end face that contacts each other when the sliding bearing body and the gear shaft 10 are combined to work together. In some embodiments, the wear-resistant coating is a DLC coating. The DLC coating is also called a diamond-like coating, which is a substance composed of carbon elements, similar to diamond in nature, and having a graphite atomic composition structure. The DLC coating has high hardness (up to HV3000-4000), good wear resistance, low friction coefficient, and good chemical resistance, and the surface is black and shiny. Due to the high hardness of the DLC coating, the wear resistance is quite good. At the same time, the friction coefficient of the DLC coating is low, and for a gear pump with rotational motion and friction motion, the problem of parts being damaged due to friction is solved.

[0032] In some embodiments, the embodiments of the utility model further arrange the coating to improve the hardness of the sliding bearing, increase the wear resistance of the sliding bearing, and solve the problem of heat generation caused by friction by further reducing the friction coefficient between the sliding bearing and the gear shaft.

[0033] In some embodiments, the lubricating oil groove 25 is a double-layer spiral groove, including a first spiral groove 251 and a second spiral groove 252, and the first spiral groove and the second spiral groove are arranged in a step-like manner and connected together. In some embodiments, the width of the first spiral groove 251 is greater than the width of the second spiral groove 252 and the depth is greater than the depth of the second spiral groove. Among them, one end of the first spiral groove 251 away from the second spiral groove 251 is connected to the first end face of the sliding bearing body, that is, the working face 21, and one end of the second spiral groove 252 away from the first spiral groove 251 is connected to the second end face of the sliding bearing body, that is, the non-working face 22, and the first end face and the second end face are arranged opposite to each other.

[0034] The utility model improves the lubrication effect of the sliding bearing and the gear shaft, reduces the friction, increases the hardness, and enhances the wear resistance through the above different technical measures; the sharp edge of the oil groove is changed to an arc transition, and the risk of sharp edge collision and burring between the gear shaft and the sliding bearing during operation is eliminated, thereby extending the service life of the gear pump and improving the quality of the product, thereby achieving the purpose of improving product quality and extending product life, and the effect is quite obvious.

[0035] Through repeated use in carbon fiber stock liquid delivery pumps, booster pumps, and green fiber (also called Tencel) stock liquid delivery pumps and booster pumps, it is proved that the structure of the sliding bearing of the present application can fully meet the use requirements of users, and the effect is very obvious. Moreover, after such a change, the life of the gear pump is increased, the problem of strain on the gear pump bearing and gear shaft is solved, and of course there will be no pump jam.

[0036] Another aspect of the utility model provides a melt gear pump, comprising the melt gear pump sliding bearing described in one aspect of the utility model.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model.

[0038] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sliding bearing for a melt gear pump, comprising a sliding bearing body, wherein the sliding bearing body comprises a lubricating oil groove, characterized in that: The lubricating oil groove is a spiral groove; the lubricating oil groove is a double-layer spiral groove, including a first spiral groove and a second spiral groove, the first spiral groove and the second spiral groove are arranged in steps and connected together; the width of the first spiral groove is greater than the width of the second spiral groove and the depth is greater than the depth of the second spiral groove.

2. The melt gear pump sliding bearing according to claim 1, characterized in that: The intersection or connection position between the lubricating oil groove and the bearing hole of the sliding bearing body forms a first arc transition connection structure.

3. The melt gear pump sliding bearing according to claim 1, characterized in that: The end face of the sliding bearing body is provided with an end face oil groove, and a second arc transition structure is formed between the side face in the length direction of the end face oil groove and the end face of the sliding bearing body.

4. The melt gear pump sliding bearing according to claim 1, characterized in that: A third arc transition structure is provided between the two sides of the lubricating oil groove and the inner surface of the bearing hole of the sliding bearing body.

5. The melt gear pump sliding bearing according to claim 1, characterized in that: The sliding bearing body comprises a working surface, the surface of which is provided with a wear-resistant coating, and the working surface is the end surface that contacts each other when the sliding bearing body and the gear shaft are combined together for operation.

6. The melt gear pump sliding bearing according to claim 5, characterized in that: The wear-resistant coating is a DLC coating.

7. The melt gear pump sliding bearing according to claim 1, characterized in that: One end of the first spiral groove away from the second spiral groove is connected to the first end surface of the sliding bearing body, and one end of the second spiral groove away from the first spiral groove is connected to the second end surface of the sliding bearing body. The first end surface and the second end surface are arranged opposite to each other.

8. Melt gear pump, characterized in that: The invention comprises the melt gear pump sliding bearing as described in any one of claims 1 to 7.

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