Automatic lubricating unit capable of exhausting air to suck diluent and then injecting and sucking grease

Abstract

The utility model discloses an automatic lubricating unit capable of exhausting air firstly to suck diluent and then injecting and sucking grease, which belongs to the technical field of lubricating pumps and is characterized in that the side wall of a pump body is provided with a grease supplementing one-way valve, an aged grease discharge one-way valve, a diluent suction component, a plurality of aged grease input ports and a plurality of new grease discharge ports which are communicated with a cavity. The stepped plunger comprises a small cylinder and a large cylinder, an upper flow channel and a lower flow channel are formed in the large cylinder, a new grease input one-way valve is arranged in the upper flow channel, and a mixing one-way valve is arranged in the lower flow channel. According to the invention, the lost lubricating grease is effectively supplemented, the lubricating grease in the bearing is continuously updated, the flowability of the lubricating grease is improved, the viscosity of the lubricating grease in the bearing, which is improved due to the running temperature and the rolling compaction of a moving body, is reduced, and the curing of the lubricating grease in the bearing is favorably prevented; and the actual grease injection retention time is shortened, the grease injection period is shortened, and the lubricating environment in the bearing is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lubrication pumps, in particular to an automatic lubrication unit which first exhausts air to inhale a diluent and then injects and absorbs fat. Background Art

[0002] In order to improve the service life, efficiency, energy conservation and environmental protection of heavy equipment, all kinds of heavy equipment and vehicles have adopted automatic lubrication systems. The existing automatic lubrication system mainly consists of an integrated grease supply unit plus a distributor to inject grease into the bearing of the main machine at a fixed time and in a fixed quantity. The original intention of the design of this lubrication system is to inject grease into the bearing at a fixed time and in a fixed quantity according to the loss of grease in the bearing.

[0003] Obviously, this only meets the requirement of whether there is grease in the bearing. However, the aging, contamination and local drying of the grease in the bearing will still have a great impact on the service life and efficiency of the bearing. Especially for large bearings such as wind turbine pitch bearings that run non-continuously at random intervals, their internal cavity is large, the amount of grease injected for the first time is large, the temperature difference in the operating environment is large, and the flow is small. The grease is very easy to dry up and adhere to the bearing retainer to age and harden, which rapidly increases the liquid resistance of the grease. This situation leads to an increase in the grease injection pressure, and also hinders the flow of the newly injected grease, which cannot enter the various moving surfaces in the bearing to form an oil film, resulting in insufficient local grease in the bearing, accelerated wear of the surface of the bearing moving parts, and reduced service life and efficiency of the bearing. To deal with this situation, people can only shorten the maintenance cycle of the main engine and spend a lot of manpower and material resources to clean the old and dried grease inside the bearing. Utility Model Content

[0004] The utility model aims to provide an automatic lubrication unit which first exhausts air to inhale a diluent and then injects and absorbs fat, so as to solve the problems raised in the above-mentioned prior art.

[0005] Provided is an automatic lubrication unit for first exhausting air and sucking a diluent and then injecting and sucking fat, comprising:

[0006] A pump body, wherein a cavity is formed inside the pump body, and a side wall of the pump body is provided with a fat replenishing one-way valve connected to the cavity, an old fat discharge one-way valve, a diluent suction component, a plurality of old fat input ports, and a plurality of new fat discharge ports;

[0007] The stepped plunger comprises a small cylinder and a large cylinder arranged in sequence along the propulsion direction. The stepped plunger is movably mounted in the stepped hole of the pump body. An upper flow channel and a lower flow channel are formed in the large cylinder. A new grease input check valve is arranged in the upper flow channel, and a mixing check valve is arranged in the lower flow channel.

[0008] When the stepped plunger is pushed forward from the starting point of advancement, a main oil chamber is formed between the end of the large cylinder away from the small cylinder and the pump body, and a secondary oil chamber is formed between the end of the large cylinder close to the small cylinder and the pump body, and the grease replenishing one-way valve is arranged at the top of the main oil chamber;

[0009] The output port of the new grease input check valve and the plurality of new grease discharge ports are arranged in sequence in the advancing direction of the plunger;

[0010] The aged fat discharge one-way valve, the input port of the mixing one-way valve, the diluent suction assembly and a plurality of aged fat input ports are arranged in sequence in the propulsion direction of the stepped plunger, and the output port of the mixing one-way valve, the aged fat discharge one-way valve and the auxiliary oil chamber are one-way connected.

[0011] As a further embodiment of the utility model: the aged fat discharge one-way valve comprises a first base, a first spring and a first valve ball, wherein the first spring is clamped between the first base and the first valve ball. When the stepped plunger is pushed forward and negative pressure is generated in the auxiliary oil chamber, the aged fat discharge one-way valve can remain closed to prevent the discharged diluted aged fat from being sucked back; and when the stepped plunger is withdrawn and the pressure in the auxiliary oil chamber increases, the aged fat discharge one-way valve automatically opens under the push of the diluted aged fat to discharge the diluted aged fat, thereby realizing automatic control.

[0012] As a further embodiment of the utility model: the old grease discharge one-way valve further comprises a filter screen, which is arranged at one end of the first base away from the first spring. The filter screen can filter impurities in the diluent and the old grease, and ensure the cleanliness of the new grease when the diluted old grease flows back to the lubrication point as new grease.

[0013] As a further embodiment of the utility model: the new grease input check valve includes a second base, a second spring and a second valve ball, the second spring is clamped between the inner wall of the large cylinder and the second valve ball, and the second valve ball is stopped on the second base by the second spring. The new grease input check valve can automatically close the valve after adding new grease to each lubrication point to prevent the new grease from being sucked back under the negative pressure of the main oil chamber.

[0014] As a further embodiment of the utility model: the mixing check valve comprises a third base, a third spring and a third valve ball, the third spring is clamped between the inner wall of the large cylinder and the third valve ball, and the third valve ball is stopped on the third base by the third spring. The mixing check valve automatically closes the valve after the diluent and the old grease of each lubrication point are extracted to prevent the mixture of the diluent and the old grease from flowing back to each lubrication point and the diluent suction component.

[0015] As a further embodiment of the utility model: the grease replenishing one-way valve comprises a fourth base, a fourth spring, a fourth valve ball, a grease replenishing inlet and a grease replenishing outlet, the fourth valve ball is arranged inside the fourth base and is stopped at the grease replenishing inlet by the fourth spring, and the grease replenishing outlet is opened on the side wall of the fourth base. The grease replenishing one-way valve can automatically replenish new grease to the main oil chamber when negative pressure is generated in the main oil chamber, and automatically close the valve through the fourth spring when the pressure difference between the inside and outside of the main oil chamber is balanced to prevent the new grease from flowing back.

[0016] As a further embodiment of the utility model: it also includes a communication port, an annular groove and an exhaust check valve, wherein the communication port is formed in the side wall of the pump body at the top of the main oil chamber, and when the stepped plunger is at the starting point of advancement, the communication port is connected to the exhaust check valve through the annular groove. This structure can first perform the exhaust step when the stepped plunger starts to advance, and then perform the new grease relubrication after the exhaust is completed, so that the exhaust and grease replenishment systems can operate independently.

[0017] As a further embodiment of the utility model: the exhaust check valve comprises a fifth base, a fifth spring and a fifth valve ball, wherein the fifth spring is clamped between the fifth base and the fifth valve ball. The exhaust check valve can automatically close the valve after exhaust is completed to prevent external gas from entering the main oil chamber.

[0018] As a further embodiment of the utility model: the mixing check valve is connected to a plurality of old grease input ports via a connecting groove, and the connecting groove is a fan-shaped structure formed by opening in the circumferential direction of the large cylinder. The fan-shaped structure of the connecting groove can extract old grease in multiple lubrication points at the same moving point when the stepped plunger moves, and the plurality of old grease input ports can be arranged in a matrix form to increase the number of old grease input ports.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] When the step plunger of the present application is advanced and retracted, two sets of grease processing systems can be operated simultaneously, a new grease supply system and an old grease recovery system. When the step plunger is advanced, the new grease pushes open the new grease input check valve in the upper flow channel and enters the upper flow channel, and is gradually discharged from each new grease discharge port during the gradual advancement of the plunger, supplying grease to each lubrication point for lubrication. At the same time, when the step plunger is advanced, a negative pressure is generated in the auxiliary oil chamber. Under the action of the negative pressure, the diluent suction component first extracts the diluent and pushes open the mixing check valve before entering the auxiliary oil chamber. As the step plunger is gradually advanced, the mixing check valve is connected with each old grease input port in turn and extracts the old grease in each lubrication point to the auxiliary oil chamber to mix with the diluent to dilute the old grease. When the step plunger is retracted, under the action of the new grease input check valve, each new grease discharge port will not generate negative pressure back suction. At the same time, the diluted old grease pushes open the old grease discharge check valve and is discharged.

[0021] The present application not only effectively replenishes the lost grease, but also continuously renews the grease in the bearing, improves the fluidity of the grease, and reduces the viscosity of the grease in the bearing due to the operating temperature and the rolling of the moving body, which is beneficial to prevent the solidification of the grease in the bearing; reduces the actual grease retention time and shortens the grease injection cycle, effectively improving the lubrication environment inside the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A is a schematic diagram of the working state of the lubrication unit of the utility model;

[0024] Figure 2 FIG. B is a schematic diagram of the working state of the lubrication unit of the utility model.

[0025] In the figure: 1, pump body; 11, grease replenishing one-way valve; 111, fourth base; 112, fourth spring; 113, fourth valve ball; 114, grease replenishing inlet; 115, grease replenishing outlet; 12, old grease discharging one-way valve; 121, first base; 122, first spring; 123, first valve ball; 124, filter; 13, diluent suction assembly; 14, old grease input port; 15, new grease discharge port; 2, stepped plunger; 21, small cylinder; 22, large cylinder; 221 , upper flow channel; 222, lower flow channel; 223, new grease input non-return valve; 2231, second base; 2232, second spring; 2233, second valve ball; 224, mixing non-return valve; 2241, third base; 2242, third spring; 2243, third valve ball; 3, main oil chamber; 4, auxiliary oil chamber; 51, connecting port; 52, annular groove; 53, exhaust non-return valve; 531, fifth base; 532, fifth spring; 533, fifth valve ball; 6, connecting groove. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0027] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0028] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0029] See also Figure 1-2 As shown, the automatic lubrication unit for first exhausting air and sucking diluent and then injecting fat and sucking fat in the embodiment of the utility model comprises a pump body 1 and a stepped plunger 2. A cavity is formed inside the pump body 1, and a fat replenishing one-way valve 11, an old fat discharge one-way valve 12, a diluent suction assembly 13, a plurality of old fat input ports 14 and a plurality of new fat discharge ports 15 connected to the cavity are arranged on the side wall of the pump body 1. The stepped plunger 2 comprises a small cylinder 21 and a large cylinder 22 arranged in sequence along the propulsion direction, and the stepped plunger 2 is movably mounted in the stepped hole of the pump body 1, and an upper flow channel 221 and a lower flow channel 222 are respectively formed in the large cylinder 22, a new fat input one-way valve 223 is arranged in the upper flow channel 221, and a mixing one-way valve 224 is arranged in the lower flow channel 222. When the stepped plunger 2 is pushed forward from the starting point of advancement, a main oil chamber 3 is formed between the end of the large cylinder 22 away from the small cylinder 21 and the pump body 1, and a secondary oil chamber 4 is formed between the end of the large cylinder 22 close to the small cylinder 21 and the pump body 1, and the grease replenishing check valve 11 is arranged at the top of the main oil chamber 3. The output port of the new grease input check valve 223 and a plurality of new grease discharge ports 15 are arranged in sequence in the advancement direction of the stepped plunger 2. The old grease discharge check valve 12, the input port of the mixing check valve 224, the diluent suction assembly 13 and a plurality of old grease input ports 14 are arranged in sequence in the advancement direction of the stepped plunger 2, and the output port of the mixing check valve 224, the old grease discharge check valve 12 and the secondary oil chamber 4 are in one-way communication.

[0030] The outer diameter of the small cylinder 21 is smaller than that of the large cylinder 22. The stepped plunger 2 forms a stepped structure through the small cylinder 21 and the large cylinder 22, so that when the stepped plunger 2 is pushed forward, a secondary oil chamber 4 can be formed between the large cylinder 22, the small cylinder 21 and the pump body 1. The negative pressure formed by the secondary oil chamber 4 serves as the basis for the automatic opening of the mixing check valve 224. The diluent suction assembly 13 is connected to the external diluent container to ensure the continuous supply of diluent. A number of new grease discharge ports 15 and a number of old grease input ports 14 are connected to each lubrication point. When the new grease discharge port 15 replenishes grease to the lubrication point, the new grease will push the old grease to move toward the old grease input port 14 to achieve the circulation of the grease.

[0031] The lubrication system will mix some gas when injecting and sucking grease, and may also suck a small amount of gas during operation. This part of gas will occupy part of the space of the cylinder and the grease, resulting in a decrease in the amount of grease pumped out. Therefore, the lubrication unit also includes a connecting port 51, an annular groove 52 and an exhaust check valve 53. The connecting port 51 is formed in the side wall of the pump body 1 at the top of the main oil chamber 3. The annular groove 52 is a groove-shaped structure formed along a part of the circumference on the outer side wall of the large cylinder 22. When the stepped plunger 2 is located at the starting point of the advancement, the connecting port 51 and the exhaust check valve 53 are connected through the annular groove 52.

[0032] In addition to the grease replenishment system and the old grease recovery system, the present application also has an exhaust system. The small cylinder 21 drives the large cylinder 22 through the power system to continuously move forward and backward in the pump body 1. When the large cylinder 22 moves from the starting point of propulsion, the gas at the top of the main oil chamber 3 enters from the connecting port 51 under the action of compression, flows through the annular groove 52 to the exhaust check valve 53 for discharge, completing the pre-exhaust function of the lubrication unit. At this time, the output port of the new grease input check valve 223 is not connected to the new grease discharge port 15. After the large cylinder 22 continues to advance, the annular groove 52 is disconnected from the connecting port 51 and the exhaust check valve 53, and the output port of the new grease input check valve 223 is connected to the first new grease discharge port 15. After the main oil chamber 3 is pressurized, no more exhaust is performed. Instead, as the large cylinder 22 is advanced, the grease pushes open the new grease input check valve 223 and enters the interior of the upper flow channel 221, and is discharged from each new grease discharge port 15 in turn as the large cylinder 22 continues to advance, so as to complete the grease replenishment function of the lubrication unit.

[0033] Furthermore, the exhaust check valve 53 includes a fifth base 531, a fifth spring 532 and a fifth valve ball 533, wherein the fifth spring 532 is clamped between the fifth base 531 and the fifth valve ball 533. The fifth base 531 provides a bearing platform for the fifth spring 532. When the gas enters the exhaust check valve 53 from the annular groove 52, the gas pushes the fifth valve ball 533 under the action of pressure so that the fifth valve ball 533 overcomes the thrust of the fifth spring 532 and then breaks away from the plugging port, allowing the gas to pass smoothly. After the gas is exhausted, the fifth valve ball 533 is re-sealed with the plugging port under the thrust of the fifth spring 532 to prevent external gas from entering the pump body 1 from the exhaust check valve 53.

[0034] While the fat replenishing operation is being performed, as the large cylinder 22 is pushed, the volume of the auxiliary oil chamber 4 gradually increases and negative pressure is generated. At this time, the old fat discharge check valve 12 is closed under the action of negative pressure. When the large cylinder 22 is at the starting point of the push, the input port of the mixing check valve 224 and the diluent suction component 13 are in a semi-connected state, ensuring that the large cylinder 22 can be pushed smoothly. When the large cylinder 22 starts to push, the mixing check valve 224 opens under the negative pressure of the auxiliary oil chamber 4, and the diluent suction component 13 draws diluent from the diluent container to the mixing check valve 224, and enters the auxiliary oil chamber 4 from the mixing check valve 224. As the large cylinder 22 continues to push, the mixing check valve 224 is disconnected from the diluent suction assembly 13 and connected to the old fat input port 14. Under the negative pressure of the auxiliary oil chamber 4, the old fat at the gear lubrication point is sucked into the mixing check valve 224 from the old fat input port 14, and after entering the auxiliary oil chamber 4, it is mixed and diluted with the diluent to reduce the viscosity of the old fat until the large cylinder 22 is pushed to the end of the stroke and connected to the last old fat input port 14.

[0035] When the large cylinder 22 retreats, the pressure of the mixture of old fat and diluent in the auxiliary oil chamber 4 increases, and it will not flow back to the diluent suction assembly 13 and the several old fat input ports 14 under the action of the mixing check valve 224. At this time, the old fat mixture pushes the old fat discharge check valve 12 and is discharged from there, mixed with the grease in the external fat storage cylinder, and prepares for the next cycle, completing the old fat recovery function.

[0036] The stale fat discharge one-way valve 12 comprises a first base 121, a first spring 122 and a first valve ball 123. The first spring 122 is clamped between the first base 121 and the first valve ball 123. The first base 121 is used to carry the first spring 122 and pre-compress the first spring 122 to stop the first valve ball 123 on the plug, so that the stale fat discharge one-way valve 12 can realize a one-way discharge function to prevent the discharged stale fat and diluent from flowing back.

[0037] Furthermore, the aged fat discharge one-way valve 12 further includes a filter 124, which is disposed at one end of the first base 121 away from the first spring 122. After the diluent and the aged fat are mixed, some impurities may be mixed in. To prevent these impurities from re-entering the fat storage cylinder and participating in the lubrication of the bearing, they can be filtered through the filter 124.

[0038] The new grease input check valve 223 includes a second base 2231, a second spring 2232 and a second valve ball 2233. The second spring 2232 is clamped between the inner wall of the large cylinder 22 and the second valve ball 2233. The second valve ball 2233 is stopped on the second base 2231 by the second spring 2232. The second base 2231 is arranged inside the upper flow channel 221 as a plug. When the new grease pushes the second valve ball 2233 to overcome the thrust of the second spring 2232, the second valve ball 2233 is disengaged from the second base 2231, so that the new grease can smoothly enter and be discharged from each new grease outlet 15 in sequence through the output port of the new grease input check valve 223 to enter the lubrication point of the bearing. The one-way input function of the new grease input check valve 223 is realized to prevent the grease in the new grease outlet 15 from being sucked back under the negative pressure of the main oil chamber 3 when the large cylinder 22 retreats, resulting in insufficient grease replenishment at each bearing lubrication point.

[0039] The mixing check valve 224 includes a third base 2241, a third spring 2242 and a third valve ball 2243. The third spring 2242 is clamped between the inner wall of the large cylinder 22 and the third valve ball 2243. The third valve ball 2243 is stopped on the third base 2241 by the third spring 2242. The third base 2241 is arranged inside the lower flow channel 222 as a plug. The diluent or grease pushes the third valve ball 2243 so that the third valve ball 2243 overcomes the thrust of the third spring 2242 and breaks away from the third base 2241, so that the diluent and grease can smoothly enter the auxiliary oil chamber 4. The one-way input function of the mixing check valve 224 is realized to prevent the diluent suction assembly 13 and a number of old grease input ports 14 from being sucked back under the pressurization of the auxiliary oil chamber 4 when the large cylinder 22 retreats.

[0040] The grease replenishing one-way valve 11 comprises a fourth base 111, a fourth spring 112, a fourth valve ball 113, a grease replenishing inlet 114 and a grease replenishing outlet 115. The fourth valve ball 113 is arranged inside the fourth base 111 and is stopped at the grease replenishing inlet 114 by the fourth spring 112. The grease replenishing outlet 115 is provided on the side wall of the fourth base 111. The fourth base 111 is used to carry the fourth spring 112 and the bottom is connected with the main oil chamber 3, so that the pressure difference between the inside of the grease replenishing one-way valve 11 and the main oil chamber 3 is balanced, ensuring that the fourth valve ball 113 can be pushed under the pressure change of the main oil chamber 3. When the large cylinder 22 retreats, the main oil chamber 3 is in a negative pressure state, and the external grease pushes the fourth valve ball 113 from the grease replenishing inlet 114 to automatically enter the inside of the main oil chamber 3 through the grease replenishing outlet 115, so as to achieve the pressure difference balance between the inside and outside of the main oil chamber 3.

[0041] The mixing check valve 224 is connected to the plurality of fat inlet ports 14 via the connecting groove 6, which is a fan-shaped structure formed by opening in the circumferential direction of the large cylinder 22. The connecting groove 6 of the fan-shaped structure increases the communication range, so that the connecting groove 6 can be connected to a plurality of fat inlet ports 14 at the same time when passing through a single connection point, avoiding the insufficient arrangement space caused by the single-line arrangement of the plurality of fat inlet ports 14, and making the structural arrangement more reasonable.

[0042] In one embodiment, the old fat discharge one-way valve 12 is connected to the main oil chamber 3 to return the mixture of old fat and diluent in the old fat discharge one-way valve 12 to the main oil chamber 3. After the old fat is diluted with the diluent, the viscosity of the old fat decreases and can be directly discharged into the main oil chamber 3 through a pipeline for reuse.

[0043] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. An automatic lubrication unit that first exhausts air to inhale a diluent and then injects and sucks fat, characterized in that: include: A pump body (1), wherein a cavity is formed inside the pump body (1), and a side wall of the pump body (1) is provided with a fat replenishing one-way valve (11) connected to the cavity, an old fat discharge one-way valve (12), a diluent suction component (13), a plurality of old fat input ports (14), and a plurality of new fat discharge ports (15); A stepped plunger (2), comprising a small cylinder (21) and a large cylinder (22) arranged in sequence along the propulsion direction, the stepped plunger (2) being movably mounted in the stepped hole of the pump body (1), an upper flow channel (221) and a lower flow channel (222) being formed in the large cylinder (22), a new fat input check valve (223) being arranged in the upper flow channel (221), and a mixing check valve (224) being arranged in the lower flow channel (222); When the stepped plunger (2) is pushed forward from the starting point of pushing, a main oil chamber (3) is formed between the end of the large cylinder (22) away from the small cylinder (21) and the pump body (1), and a secondary oil chamber (4) is formed between the end of the large cylinder (22) close to the small cylinder (21) and the pump body (1), and the grease replenishing one-way valve (11) is arranged at the top of the main oil chamber (3); The output port of the new grease input check valve (223) and a plurality of new grease discharge ports (15) are arranged in sequence in the advancing direction of the stepped plunger (2); The aged fat discharge one-way valve (12), the input port of the mixing one-way valve (224), the diluent suction assembly (13) and a plurality of aged fat input ports (14) are arranged in sequence in the propulsion direction of the stepped plunger (2), and the output port of the mixing one-way valve (224), the aged fat discharge one-way valve (12) and the auxiliary oil chamber (4) are in one-way communication.

2. The automatic lubrication unit according to claim 1, which first exhausts air to inhale diluent and then injects and sucks fat, is characterized in that: The aged fat discharge one-way valve (12) comprises a first base (121), a first spring (122) and a first valve ball (123), wherein the first spring (122) is clamped between the first base (121) and the first valve ball (123).

3. The automatic lubrication unit according to claim 2, which first exhausts air to inhale diluent and then injects and sucks fat, is characterized in that: The aged fat discharge one-way valve (12) further comprises a filter screen (124), wherein the filter screen (124) is arranged at an end of the first base (121) away from the first spring (122).

4. The automatic lubrication unit of claim 1, which first exhausts air to inhale a diluent and then injects and sucks fat, is characterized in that: The new fat input one-way valve (223) includes a second base (2231), a second spring (2232) and a second valve ball (2233), wherein the second spring (2232) is clamped between the inner wall of the large cylinder (22) and the second valve ball (2233), and the second valve ball (2233) is stopped on the second base (2231) by the second spring (2232).

5. The automatic lubrication unit of claim 1, which first exhausts air to inhale a diluent and then injects and sucks fat, is characterized in that: The mixing one-way valve (224) includes a third base (2241), a third spring (2242) and a third valve ball (2243), wherein the third spring (2242) is clamped between the inner wall of the large cylinder (22) and the third valve ball (2243), and the third valve ball (2243) is stopped on the third base (2241) by the third spring (2242).

6. The automatic lubrication unit of claim 1, which first exhausts air to inhale a diluent and then injects and sucks fat, is characterized in that: The grease replenishing one-way valve (11) comprises a fourth base (111), a fourth spring (112), a fourth valve ball (113), a grease replenishing inlet (114) and a grease replenishing outlet (115); the fourth valve ball (113) is arranged inside the fourth base (111) and is stopped at the grease replenishing inlet (114) by the fourth spring (112); and the grease replenishing outlet (115) is opened on the side wall of the fourth base (111).

7. The automatic lubrication unit of claim 1, which first exhausts air to inhale diluent and then injects and sucks fat, is characterized in that: It also comprises a communication port (51), an annular groove (52) and an exhaust check valve (53); the communication port (51) is formed in the side wall of the pump body (1) at the top of the main oil chamber (3); when the stepped plunger (2) is located at the starting point of advancement, the communication port (51) is connected to the exhaust check valve (53) via the annular groove (52).

8. The automatic lubrication unit for first exhausting air and sucking diluent and then injecting and sucking fat according to claim 7, characterized in that: The exhaust check valve (53) comprises a fifth base (531), a fifth spring (532) and a fifth valve ball (533), wherein the fifth spring (532) is clamped between the fifth base (531) and the fifth valve ball (533).

9. The automatic lubrication unit of claim 1, which first exhausts air to inhale a diluent and then injects and sucks fat, is characterized in that: The mixing check valve (224) is connected to a plurality of aged fat input ports (14) via a connecting groove (6), and the connecting groove (6) is a fan-shaped structure formed by opening in the circumferential direction of the large cylinder (22).

10. The automatic lubrication unit of claim 1, which first exhausts air to inhale a diluent and then injects and sucks fat, is characterized in that: The aged fat discharge one-way valve (12) is connected to the main oil chamber (3) for returning the mixture of aged fat and diluent in the aged fat discharge one-way valve (12) to the main oil chamber (3).

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