Automatic lubricating unit capable of exhausting firstly, progressively injecting grease and sucking grease in parallel

Abstract

The automatic lubricating unit comprises a pump body, a cavity is formed in the pump body, a plunger and a screw plug are installed at the two ends of the cavity respectively, and lubricating grease is filled between the plunger and the screw plug. A grease supplementing channel and a grease suction channel are arranged on the pump body, and both the grease supplementing channel and the grease suction channel are communicated with the cavity; when the plunger moves, the cavity is divided into a closed first accommodating cavity and a closed second accommodating cavity; a first flow channel and a second flow channel are arranged in the plunger. According to the lubricating unit, through progressive movement of the plunger and separation design of the cavity, it is ensured that lubricating grease can be evenly injected into all grease injection points of the bearing, original lubricating grease in the bearing can be sucked out while grease injection is conducted, old lubricating grease in the bearing is effectively removed, and damage to the bearing caused by lubricating grease pollution is prevented. And after the old lubricating grease is sucked out, the old lubricating grease can be mixed with new lubricating grease to be reused, so that the lubricating efficiency is improved, and the waste of the lubricating grease is reduced.

Description

Technical Field

[0001] The utility model relates to a lubrication unit, in particular to an automatic lubrication unit which first vents air and then progressively injects fat and suctions fat in parallel. Background Art

[0002] In order to improve the service life, efficiency, energy conservation and environmental protection of heavy equipment, various heavy equipment and vehicles generally use automatic lubrication systems. The existing automatic lubrication system is mainly composed of an integrated grease supply unit and a dispenser, which injects grease into the bearings of the main machine in a timed and quantitative manner. The original intention of the design of this lubrication system is to regularly replenish grease according to the consumption of grease in the bearing. However, this method can only meet the basic needs of whether there is grease in the bearing, and cannot solve the problems of grease aging, contamination and local drying.

[0003] Especially for large bearings such as the variable pitch bearings of wind turbines, they have large internal cavities, and the amount of grease injected for the first time is large. In addition, the temperature difference in the operating environment is large and the grease has poor fluidity. The grease is very easy to dry up and adhere to the bearing cage, causing the grease to age and harden, thereby increasing the fluid resistance, increasing the grease injection pressure, hindering the flow of the newly injected grease, and failing to effectively cover the moving surfaces in the bearing to form an oil film. This will lead to insufficient local lubrication in the bearing, accelerate the wear of the moving parts of the bearing, and ultimately shorten the service life of the bearing and reduce its operating efficiency.

[0004] To address the above problems, the traditional method is to shorten the maintenance cycle of the equipment and frequently clean the old and dried grease inside the bearing. This method is time-consuming and labor-intensive and cannot fundamentally solve the problem. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a lubrication unit capable of reducing the viscosity of the lubricating grease in the bearing.

[0006] According to the first aspect of the utility model, an automatic lubrication unit that first vents and then progressively injects grease and suctions grease in parallel comprises a pump body, wherein the pump body has a cavity, a plunger and a screw plug are respectively installed at both ends of the cavity, and grease is filled between the plunger and the screw plug; a grease replenishing channel and a grease suction channel are provided on the pump body, and both the grease replenishing channel and the grease suction channel are connected to the cavity; when the plunger moves, the cavity is divided into a first closed cavity and a second closed cavity; a first flow channel and a second flow channel are provided in the plunger, and the first flow channel and the second flow channel are respectively connected to the first cavity and the second cavity through the first flow channel and the second flow channel.

[0007] In the initial state, the space between the plunger and the screw plug, the first flow channel and the second flow channel are filled with grease. When the plunger moves toward the screw plug, the space where the pump body and the plunger are in close contact is released, and the space between the plunger and the screw plug is squeezed, so that the gas in the cavity is discharged and the cavity is divided into the first cavity and the second cavity. As the plunger starts to move, the space of the second cavity is occupied, so that the grease in the second cavity is pressed into the second flow channel, and then discharged from the second flow channel to various grease injection points on the bearing through the pipeline; while the space of the first cavity increases and generates negative pressure, which produces an adsorption effect on the grease suction channel connected to it, and by connecting the grease suction channel with the grease suction hole on the bearing, the original grease in the bearing is sucked out into the first cavity. After the plunger moves toward the screw plug, the return stroke begins. At this time, the space of the second cavity increases and generates negative pressure, sucking new grease from the grease replenishment channel. At the same time, the space of the first cavity is squeezed, and the grease in the first cavity is discharged to the second cavity through the first flow channel and mixed with the new grease until the return stroke ends.

[0008] According to a technical solution of an automatic lubrication unit for exhausting air first and then progressively injecting fat and sucking fat in parallel in an embodiment of the utility model, at least the following beneficial effects are achieved:

[0009] The lubrication unit ensures that the grease can be evenly injected into each grease injection point of the bearing to form a uniform lubrication film through the progressive movement of the plunger and the partition design of the cavity. In addition, the lubrication unit also sucks out the original, aged or contaminated grease in the bearing through the first flow channel while injecting grease, effectively removing the old grease inside the bearing and preventing the damage to the bearing caused by grease contamination. After the old grease is sucked out, it can be mixed with new grease for reuse, which not only improves the lubrication efficiency but also reduces the waste of grease.

[0010] According to some embodiments of the utility model, the grease suction channel is connected to the first cavity. The negative pressure generated by the first cavity during the progressive grease injection process can quickly and effectively suck out aged or contaminated grease from the inside of the bearing, thereby avoiding long-term accumulation of grease inside the bearing and reducing friction and wear of the bearing.

[0011] According to some embodiments of the utility model, when the plunger is in the initial state, the plunger closes the liposuction channel to prevent leakage of grease when not in operation. At the same time, closing the liposuction assembly can prevent air from entering the lubrication unit, thereby avoiding the generation of bubbles in the grease due to gas mixing, which affects the lubrication effect.

[0012] According to some embodiments of the utility model, an exhaust groove is provided at the front end of the plunger, and a corresponding exhaust component is provided on the pump body. The exhaust component can effectively exhaust the air in the cavity to prevent gas accumulation in the lubrication unit.

[0013] According to some embodiments of the present invention, when the plunger is in an initial state, the exhaust groove is communicated with an exhaust assembly.

[0014] According to some embodiments of the utility model, the grease suction channel is connected to the parallel through-hole joint body of the bearing via the first joint, and the old grease in the bearing can be quickly sucked out. The grease suction process and the grease injection process are carried out simultaneously to achieve efficient circulation, avoid local accumulation of grease in the bearing, and ensure that all parts of the bearing are fully lubricated.

[0015] According to some embodiments of the utility model, the first flow channel is communicated with the grease discharge hole provided on the upper part of the pump body, so that the grease can be quickly discharged through the grease discharge hole, thereby ensuring the fluidity and injection efficiency of the grease.

[0016] According to some embodiments of the utility model, when the plunger is in the initial state, the plunger closes the grease discharge hole to prevent the leakage of grease when the lubrication unit is not in operation, thereby ensuring the safe storage of the grease.

[0017] According to some embodiments of the utility model, when the plunger is in the initial state, the grease replenishing channel is closed to prevent the grease from leaking from the grease replenishing channel, thereby further ensuring the sealing performance of the system and the preservation of the grease.

[0018] According to some embodiments of the utility model, a seal is further provided between the plunger and the cavity. The sealing effect of the seal ensures the stability of the pressure inside the lubrication unit, avoids the poor flow of grease caused by pressure fluctuations, and improves the stability and reliability of the operation of the lubrication unit.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a structural schematic diagram of the lubrication unit in the initial state;

[0022] Figure 2 It is a structural schematic diagram of the lubrication unit when the plunger moves toward the screw plug;

[0023] Figure 3 Schematic diagram of the structure of the first flow channel.

[0024] Explanation of the accompanying drawings: 1. plunger; 2. pump body; 3. plug; 4. liposuction channel; 5. grease replenishing channel; 6. exhaust channel; 7. first joint; 8. second joint; 9. cavity; 10. first spring seat; 11. first one-way valve seat; 12. first steel ball; 13. first spring; 14. sealing element; 101. first flow channel; 102. second flow channel; 901. first cavity; 902. second cavity. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] like Figure 1 As shown, an automatic lubrication unit for exhausting air first and then progressively injecting grease and sucking grease in parallel comprises a pump body 2, wherein a cavity 9 is provided in the pump body 2, a plunger 1 and a screw plug 3 are respectively installed at both ends of the cavity 9, a space between the plunger 1 and the screw plug 3 is filled with grease, a grease replenishing channel 5 is provided on the pump body 2, and the grease replenishing channel 5 is communicated with the cavity 9;

[0030] Among them, the plunger 1 is a stepped structure, which includes a large cylindrical end and a small cylindrical end. In the initial state, the large cylindrical end of the plunger 1 fits with one end of the cavity 9. When the plunger 1 moves toward the screw plug 3, the space where it fits with the cavity 9 is released, thereby dividing the cavity 9 into a closed first cavity 901 and a second cavity 902; a first flow channel 101 and a second flow channel 102 are provided in the cylindrical body of the plunger 1, the first flow channel 101 is connected to the first cavity 901, the second flow channel 102 is connected to the second cavity 902, the second flow channel 102 is connected to each grease injection point on the bearing through a pipeline, and a grease suction channel 4 connected to the first cavity 901 is also provided on the pump body 2, and the grease suction channel 4 is connected to the parallel porous joint body near the bearing through a first joint 7, and then the channel pipeline is connected to the grease suction hole on the bearing.

[0031] In order to make the first flow channel 101, the second flow channel 102, the grease replenishing channel 5 and the grease suction channel 4 in a closed state under normal conditions (i.e., in the initial state) to prevent the leakage of grease, in this embodiment, a first spring seat 10 and a first one-way valve seat 11 are arranged in the first flow channel 101, and the first spring seat 10 is connected to the first steel ball 12 through the first spring 13, and the first steel ball 12 is driven by the elastic force of the first spring 13 to seal the first one-way valve seat 11. A second spring seat and a second one-way valve seat are arranged in the second flow channel 102, and the second spring seat is connected to the second steel ball through the second spring, and the second steel ball is driven by the elastic force of the second spring to seal the second one-way valve seat. A third spring seat and a third one-way valve seat are arranged in the grease replenishing channel 5, and the third spring seat is connected to the third steel ball through the third spring, and the third steel ball is driven by the elastic force of the third spring to seal the third one-way valve seat. A fourth spring seat is arranged in the grease suction channel 4, and the fourth spring seat is connected to the fourth steel ball through the fourth spring, and the fourth steel ball is driven by the elastic force of the fourth spring to seal the joint. In summary, a one-way valve seat is provided in each flow channel, and the steel ball is driven by the spring seat to block the channel of the one-way valve seat, thereby achieving sealing of each channel in the initial state.

[0032] like Figure 2-3As shown, in the initial state, the space between the plunger 1 and the screw plug 3, the first flow channel 101 and the second flow channel 102 are filled with grease. When the plunger 1 moves toward the screw plug 3, the space where the large cylindrical end of the plunger 1 fits with the cavity 9 is released, and the space between the plunger 1 and the screw plug 3 is squeezed, so that the gas in the cavity 9 is discharged and the cavity 9 is divided into a first cavity 901 and a second cavity 902. As the plunger 1 starts to move, the space in the second cavity 902 is occupied, so that the grease in the second cavity 902 is pressed into the second flow channel 102. Under the action of pressure, the grease breaks the seal of the second steel ball on the second flow channel 102, and then is discharged from the second flow channel 102 through the pipeline to various grease injection points on the bearing; and the space of the first cavity 901 increases and generates negative pressure, which produces an adsorption effect on the grease suction channel 4 connected thereto, and releases the seal of the fourth steel ball on the grease suction channel 4, thereby sucking the original waste grease in the bearing into the first cavity 901. After the plunger 1 moves toward the screw plug 3, it starts to return. At this time, the space of the second chamber 902 increases and generates negative pressure, which produces an adsorption effect on the grease replenishment channel 5 connected thereto, and releases the seal of the third steel ball on the grease replenishment channel 5 to absorb new grease from the grease replenishment channel 5. At the same time, the space of the first chamber 901 is squeezed, and the waste grease in the first chamber 901 is pressed into the first flow channel 101. Under the action of pressure, the waste grease reopens the seal of the first flow channel 101 by the first steel ball 12, and then is discharged to the second chamber 902 through the first flow channel 101 and mixed with the new grease until the return stroke ends, preparing for the next grease injection cycle. The theoretical injection amount of old grease sucked out of the bearing each time is the difference between the cross-sectional area of ​​the large cylindrical end of the plunger 1 and the cross-sectional area of ​​its small cylindrical body multiplied by the product of its travel distance.

[0033] The lubrication unit ensures that the grease can be evenly injected into each grease injection point of the bearing to form a uniform lubricating film through the progressive movement of the plunger 1 and the partition design of the cavity 9. In addition, the lubrication unit also sucks out the original, aged or contaminated grease in the bearing through the first flow channel 101 while injecting grease, effectively removing the old grease inside the bearing and preventing the damage to the bearing caused by grease contamination. After the old grease is sucked out, it can be mixed with new grease for reuse, which not only improves the lubrication efficiency but also reduces the waste of grease.

[0034] Preferably, an exhaust groove is provided at the front end of the plunger 1, and a corresponding exhaust channel 6 is provided in the pump body 2. The exhaust channel 6 is connected to a container containing a diluent or grease through a second joint 8. A fifth spring and a fifth steel ball are also provided in the exhaust channel 6. The fifth steel ball is driven by the elastic force of the fifth spring to seal the first joint 7 in the initial state. In the initial state, the exhaust groove on the plunger 1 is connected to the exhaust channel 6, and the exhaust groove and the exhaust channel 6 are filled with lubricant. After the plunger 1 moves toward the screw plug 3, the air in the cavity 9 can be effectively removed through the exhaust channel 6 to prevent gas from accumulating in the lubrication unit.

[0035] Preferably, a seal 14 is further provided between the plunger 1 and the cavity 9. The sealing effect of the seal 14 ensures the stability of the pressure inside the lubrication unit, avoids the poor flow of grease due to pressure fluctuations, and improves the stability and reliability of the operation of the lubrication unit.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An automatic lubrication unit for exhausting air first and then progressively injecting fat and sucking fat in parallel, comprising a pump body (2), characterized in that: The pump body (2) has a cavity (9) in it, a plunger (1) and a screw plug (3) are respectively installed at both ends of the cavity (9), and grease is filled between the plunger (1) and the screw plug (3); A fat-supplementing channel (5) and a fat-sucking channel (4) are provided on the pump body (2), and both the fat-supplementing channel (5) and the fat-sucking channel (4) are connected to the cavity (9); When the plunger (1) moves, the cavity (9) is divided into a sealed first cavity (901) and a second cavity (902); The plunger (1) is provided with a first flow channel (101) and a second flow channel (102), and is respectively connected to the first cavity (901) and the second cavity (902) through the first flow channel (101) and the second flow channel (102).

2. The lubrication unit according to claim 1, characterized in that: The liposuction channel (4) is in communication with the first cavity (901).

3. The lubrication unit according to claim 1, characterized in that: When the plunger (1) is in the initial state, the plunger (1) closes the liposuction channel (4).

4. The lubrication unit according to claim 1, characterized in that: An exhaust groove is provided at the front end of the plunger (1), and a corresponding exhaust assembly is provided on the pump body (2).

5. The lubrication unit according to claim 4, characterized in that: When the plunger (1) is in an initial state, the exhaust groove is connected to the exhaust component.

6. The lubrication unit according to claim 2, characterized in that: The liposuction channel (4) is connected to the parallel through-hole connector body of the bearing via a first connector (7).

7. The lubrication unit according to claim 1, characterized in that: The first flow channel (101) is communicated with a grease discharge hole provided on the upper part of the pump body (2).

8. The lubrication unit according to claim 7, characterized in that When the plunger (1) is in the initial state, the plunger (1) closes the grease discharge hole.

9. The lubrication unit according to claim 1, characterized in that: It also comprises a grease replenishing channel (5) arranged on the upper part of the pump body (2); when the plunger (1) is in the initial state, the grease replenishing channel (5) is closed.

10. The lubrication unit according to claim 4, characterized in that: A sealing member (14) is also provided between the plunger (1) and the cavity (9).

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