Lubricating structure of a plunger pump and plunger pump

Abstract

The application discloses a lubricating structure of a plunger pump, which comprises an eccentric disc, a star wheel, two sealing bearings and a sliding block. The eccentric disc is rotatably installed in a pump body of the plunger pump. The star wheel is sleeved on the eccentric disc. The two sealing bearings are both installed between the inner circumferential surface of the star wheel and the outer circumferential surface of the eccentric disc. The two sealing bearings are spaced apart in the axial direction of the star wheel. The eccentric disc, the star wheel and the two sealing bearings surround to form an oil chamber. The eccentric disc is provided with a first oil inlet channel which is communicated with the oil chamber and the outside. The pump body is provided with a sliding channel. The sliding block is slidably matched with the sliding channel and a first matching gap is formed between the sliding block and the sliding channel. The sliding block and the star wheel are transmissionally connected. The sliding block is provided with an oil outlet channel which is communicated with the oil chamber and the first matching gap. The lubricating structure of the plunger pump has the advantages of small lubricating oil consumption and good lubricating effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pumps, in particular, to a lubricating structure of a plunger pump and the plunger pump. BACKGROUND

[0002] A radial plunger pump is disclosed in Chinese Patent No. CN113404682A, which sets an oil storage groove on the outer circumferential surface of the eccentric shaft or the inner circumferential surface of the cam, thereby realizing lubrication of the lubricating oil in the cooperation gap between the two and flow between the internal oil channels of the two. However, under the action of oil pressure, the lubricating oil is prone to overflow from the above-mentioned cooperation gap. Thus, this technology has the defects of large lubricating oil consumption and poor lubrication effect. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a lubricating structure of a plunger pump, which has the advantages of small lubricating oil consumption and good lubrication effect.

[0004] An embodiment of the present application also proposes a plunger pump.

[0005] The lubricating structure of the plunger pump according to the embodiment of the present application comprises an eccentric disc, a star wheel, two sealing bearings and a sliding block, the eccentric disc is rotatably installed in the pump body of the plunger pump; the star wheel is sleeved on the eccentric disc, the two sealing bearings are both installed between the inner circumferential surface of the star wheel and the outer circumferential surface of the eccentric disc, the two sealing bearings are spaced apart in the axial direction of the star wheel, the eccentric disc, the star wheel and the two sealing bearings form an oil chamber, the eccentric disc is provided with a first oil inlet channel communicating the oil chamber with the outside; the pump body is provided with a sliding channel, the sliding block is slidably fitted in the sliding channel and forms a first cooperation gap with the sliding channel, the sliding block and the star wheel are drivingly connected, and the sliding block is provided with an oil outlet channel communicating the oil chamber and the first cooperation gap.

[0006] According to the lubricating structure of the plunger pump of the embodiment of the present application, the lubricating oil enters the oil chamber through the first oil inlet channel, and under the sealing action of the two sealing bearings, the lubricating oil is prevented from overflowing from the oil chamber, in other words, the lubricating oil is prevented from overflowing from the cooperation area of the eccentric disc and the star wheel. Thus, not only is the waste of lubricating oil reduced and the consumption of lubricating oil is lowered, but also the lubrication effect of the lubricating oil on the cooperation area of the eccentric disc and the star wheel is improved.

[0007] In some embodiments, a first pin shaft, a second pin shaft and a connecting rod are further included, the first pin shaft is fixedly arranged on the star wheel; the second pin shaft is fixedly arranged on the slider; two ends of the connecting rod are pivotally connected with the first pin shaft and the second pin shaft respectively, and the star wheel, the first pin shaft, the connecting rod and the second pin shaft jointly constitute an oil path which communicates the oil chamber and the oil outlet.

[0008] In some embodiments, the star wheel is provided with a first mounting slot, the first mounting slot forms a first opening towards an end of the slider, walls of the star wheel for constituting the first mounting slot include a first side wall and a second side wall, the first side wall and the second side wall are opposite in the axial direction of the star wheel, and the first side wall and the second side wall are both provided with a first through hole which communicates with the first mounting slot, the first pin shaft is fitted in the two first through holes and the first mounting slot, and the first end of the connecting rod is fitted in the first mounting slot through the first opening and is pivotally connected with the first pin shaft.

[0009] The slider is provided with a second mounting slot, the second mounting slot forms a second opening towards an end of the star wheel, walls of the slider for constituting the second mounting slot include a third side wall and a fourth side wall, the third side wall and the fourth side wall are opposite in the axial direction of the star wheel, and the third side wall and the fourth side wall are both provided with a second through hole which communicates with the second mounting slot, the second pin shaft is fitted in the two second through holes and the second mounting slot, and the second end of the connecting rod is fitted in the second mounting slot through the second opening and is pivotally connected with the second pin shaft.

[0010] In some embodiments, the first end of the connecting rod is provided with a first through hole which is coaxial with the first pin shaft, the first pin shaft is inserted into the first through hole and is pivotally connected with the connecting rod; the second end of the connecting rod is provided with a second through hole which is coaxial with the second pin shaft, the second pin shaft is inserted into the second through hole and is pivotally connected with the connecting rod.

[0011] In some embodiments, the oil passage includes a first oil channel, a second oil channel, a third oil channel and a fourth oil channel, the first pin shaft and the first through hole form a second matching gap, the first oil channel is opened in the star wheel and communicates the second matching gap and the oil chamber; the first pin shaft and the first through hole form a third matching gap, the second oil channel is opened in the first pin shaft and communicates the second matching gap and the third matching gap; the second pin shaft and the second through hole form a fourth matching gap, the third oil channel is opened in the connecting rod and communicates the third matching gap and the fourth matching gap; the second pin shaft and the second through hole form a fifth matching gap, the fourth oil channel is opened in the second pin shaft and communicates the fourth matching gap and the fifth matching gap, and the oil outlet channel communicates the fifth matching gap and the first matching gap.

[0012] In some embodiments, the first oil channel includes a fifth oil channel, a sixth oil channel and a seventh oil channel, the wall of the star wheel for constituting the first mounting groove further includes a first bottom wall, the first bottom wall and the first opening are opposite in the radial direction of the star wheel, the fifth oil channel is opened in the first bottom wall and extends in the axial direction of the star wheel, the sixth oil channel extends in the radial direction of the star wheel and communicates the oil chamber and the fifth oil channel; the seventh oil channel has two and is arranged on the first side wall and the second side wall respectively, the two seventh oil channels and the two second matching gaps correspond one by one, the seventh oil channel extends in the radial direction of the star wheel and communicates the corresponding second matching gap and the fifth oil channel.

[0013] In some embodiments, the second oil channel includes an eighth oil channel, a ninth oil channel and a tenth oil channel, the eighth oil channel is coaxially arranged in the first pin shaft; the number of the ninth oil channel is equal to that of the second matching gap and corresponds one by one, the ninth oil channel extends in the radial direction of the first pin shaft and communicates the corresponding second matching gap and the eighth oil channel; the tenth oil channel extends in the radial direction of the first pin shaft and crosses the eighth oil channel, and both ends of the tenth oil channel communicate with the third matching gap.

[0014] In some embodiments, the fourth oil channel includes an eleventh oil channel, a twelfth oil channel and a thirteenth oil channel, the eleventh oil channel is coaxially arranged in the second pin shaft; the twelfth oil channel extends in the radial direction of the second pin shaft and crosses the eleventh oil channel, and both ends of the twelfth oil channel communicate with the fourth matching gap; the thirteenth oil channel has two and corresponds to the two fifth matching gaps one by one, the thirteenth oil channel extends in the radial direction of the second pin shaft and crosses the eleventh oil channel, and both ends of the thirteenth oil channel communicate with the corresponding fifth matching gap.

[0015] The plunger pump according to the embodiment of the present application comprises the lubricating structure of the plunger pump as described in any of the above embodiments, and further comprises a pump body, a crankshaft, a rotary joint, a gear pump and a pipeline; the crankshaft is rotatably installed on the pump body, the lubricating structures are distributed in the axial direction of the crankshaft at intervals, the crankshaft comprises shaft segments corresponding to the lubricating structures respectively, the eccentric discs in the lubricating structures are formed on the corresponding shaft segments, the crankshaft is provided with a main oil passage extending in the axial direction thereof, and the main oil passage is communicated with each of the first oil inlets of the lubricating structures; any end of the main oil passage constitutes an oil supply port communicated with the outside, the rotary joint is installed on the oil supply port, the gear pump is connected with the rotary joint and adapted to deliver lubricating oil to the main oil passage through the rotary joint, and the pipeline is equal in number to the lubricating structures and corresponds to the lubricating structures respectively, and the pipeline connects the slide channel in the corresponding lubricating structure and the gear pump, so that the lubricating oil in the slide channel is returned to the gear pump through the corresponding pipeline.

[0016] The pipeline of the plunger pump according to the embodiment of the present application realizes the effect of recycling of the lubricating oil and avoids the accumulation of the lubricating oil in the slide channel to affect the sliding effect of the sliding block, thereby ensuring the reliability of the plunger pump.

[0017] The other technical advantages of the plunger pump according to the embodiment of the present application are the same as those of the lubricating structure of the plunger pump according to the above embodiments, and will not be described herein again.

[0018] In some embodiments, the plunger pump further comprises crankshaft bearings, the crankshaft bearings are distributed in the axial direction of the crankshaft at intervals, the crankshaft bearings are installed between the crankshaft and the pump body, the crankshaft is provided with second oil inlets extending in the radial direction thereof, the number of the second oil inlets is equal to that of the crankshaft bearings, and the second oil inlets correspond to the crankshaft bearings respectively, and the second oil inlets are communicated with the main oil passage and the corresponding crankshaft bearings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic view of the lubricating structure of the plunger pump according to the embodiment of the present application.

[0020] Figure 2 FIG. 2 is another schematic view of the lubricating structure of the plunger pump according to the embodiment of the present application.

[0021] Reference numerals: 1. Star wheel; 11. First pin; 111. Second oil passage; 1111. Eighth oil passage; 1112. Ninth oil passage; 1113. Tenth oil passage; 12. First mounting groove; 13. First oil passage; 131. Fifth oil passage; 132. Sixth oil passage; 133. Seventh oil passage; 2. Sealed bearing; 3. Slider; 31. Oil outlet passage; 32. Second pin; 321. Fourth oil passage; 3211. Eleventh oil passage; 3212. Twelfth oil passage; 3213. Thirteenth oil passage; 33. Second mounting groove; 4. Oil chamber; 5. Pump body; 51. Slide rail; 52. Connecting rod; 521. Third oil passage; 53. Crankshaft; 531. Main oil passage; 532. First oil inlet passage; 533. Second oil inlet passage; 54. Crankshaft bearing; 55. Plunger; 56. Sealing assembly; 6. Rotary joint. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following is combined Figures 1-2 The lubrication structure and the plunger pump according to embodiments of the present invention are described.

[0024] like Figure 1 As shown, the lubrication structure of the plunger pump according to an embodiment of the present invention includes an eccentric disc, a star wheel 1, a sealed bearing 2, and a slider 3. The eccentric disc is rotatably mounted inside the pump body 5 of the plunger pump. The star wheel 1 is sleeved on the eccentric disc. There are two sealed bearings 2, each installed between the inner circumferential surface of the star wheel 1 and the outer circumferential surface of the eccentric disc. The two sealed bearings 2 are axially spaced apart from the star wheel 1. The eccentric disc, the star wheel 1, and the two sealed bearings 2 enclose an oil chamber 4. The eccentric disc has a first oil inlet passage 532 that connects the oil chamber 4 to the outside. The pump body 5 has a slide rail 51. The slider 3 is slidably fitted into the slide rail 51, and the two form a first fitting gap. The slider 3 is drive-connected to the star wheel 1. The slider 3 has an oil outlet passage 31 that connects the oil chamber 4 and the first fitting gap.

[0025] According to the lubrication structure of the plunger pump of the present invention, when the eccentric disc rotates, under the action of the sealed bearing 2, it drives the star wheel 1 to swing, and the star wheel 1 drives the slider 3 to slide in the slide rail 51, thereby realizing the intake and discharge of fluid in the slide rail 51, and thus realizing the operation of the plunger pump.

[0026] Meanwhile, lubricating oil enters the oil chamber 4 through the first oil inlet 532. The sealing effect of the two sealed bearings 2 prevents lubricating oil from overflowing from the oil chamber 4; in other words, it prevents lubricating oil from overflowing from the mating area of ​​the eccentric disc and the star wheel 1. This reduces lubricating oil waste and consumption while improving the lubrication effect of the lubricating oil on the mating area of ​​the eccentric disc and the star wheel 1.

[0027] The lubricating oil in the oil chamber 4 enters the first matching gap through the oil outlet 31, thereby lubricating the slider 3 and the slide 51.

[0028] Specifically, the first oil inlet 532 is multiple and equally spaced in the circumferential direction of the eccentric disc.

[0029] In some embodiments, as shown in Figure 1 The first pin shaft 11 is fixedly arranged on the star wheel 1. The second pin shaft 32 is fixedly arranged on the slider 3. The two ends of the connecting rod 52 are pivotally connected with the first pin shaft 11 and the second pin shaft 32 respectively. The star wheel 1, the first pin shaft 11, the connecting rod 52 and the second pin shaft 32 jointly constitute an oil path connecting the oil chamber 4 and the oil outlet 31.

[0030] Therefore, the oscillating star wheel 1 drives the connecting rod 52 to move in a plane through the first pin shaft 11, and the connecting rod 52 drives the slider 3 to slide in the slide 51 through the second pin shaft 32. In addition, the lubricating oil in the oil chamber 4 enters the oil outlet 31 through the oil path.

[0031] It can be understood that the first pin shaft 11, the connecting rod 52, the second pin shaft 32, the slider 3 and the slide 51 constitute an actuator, and the actuator is multiple and equally spaced in the circumferential direction of the star wheel 1.

[0032] In some embodiments, as shown in Figure 1 The star wheel 1 is provided with a first mounting groove 12, and an end of the first mounting groove 12 forms a first opening towards the slider 3. The wall of the star wheel 1 for constituting the first mounting groove 12 includes a first side wall and a second side wall, which are opposite in the axial direction of the star wheel 1. The first side wall and the second side wall are both provided with a first through hole in communication with the first mounting groove 12. The first pin shaft 11 is matched in the two first through holes and the first mounting groove 12. The first end of the connecting rod 52 is matched in the first mounting groove 12 through the first opening and is pivotally connected with the first pin shaft 11.

[0033] The slider 3 is provided with a second mounting groove 33, and an end of the second mounting groove 33 forms a second opening towards the star wheel 1. The wall of the slider 3 for constituting the second mounting groove 33 includes a third side wall and a fourth side wall, which are opposite in the axial direction of the star wheel 1. The third side wall and the fourth side wall are both provided with a second through hole in communication with the second mounting groove 33. The second pin shaft 32 is matched in the two second through holes and the second mounting groove 33. The second end of the connecting rod 52 is matched in the second mounting groove 33 through the second opening and is pivotally connected with the second pin shaft 32.

[0034] The slider 3 is provided with a second mounting groove 33, and an end of the second mounting groove 33 forms a second opening towards the star wheel 1. The wall of the slider 3 for constituting the second mounting groove 33 includes a third side wall and a fourth side wall, which are opposite in the axial direction of the star wheel 1. The third side wall and the fourth side wall are both provided with a second through hole in communication with the second mounting groove 33. The second pin shaft 32 is matched in the two second through holes and the second mounting groove 33. The second end of the connecting rod 52 is matched in the second mounting groove 33 through the second opening and is pivotally connected with the second pin shaft 32.

[0035] Thus, the two first through holes define the mounting positions of the first pin shaft 11, and the two second through holes define the mounting positions of the second pin shaft 32. The first mounting slot 12 defines the placement position of the first end of the connecting rod 52, and the second mounting slot 33 defines the placement position of the second end of the connecting rod 52.

[0036] It can be understood that the two first through holes are coaxially arranged, and the axes of the two first through holes both extend in the axial direction of the star wheel 1.

[0037] It can be understood that the two second through holes are coaxially arranged, and the axes of the two second through holes both extend in the axial direction of the star wheel 1.

[0038] In some embodiments, as shown in FIG. 1, the oil passage includes a first oil channel 13, a second oil channel 111, a third oil channel 521 and a fourth oil channel 321. Figure 1 It can be understood that the first end of the connecting rod 52 is provided with a first through hole coaxial with the first pin shaft 11, the first pin shaft 11 is inserted into the first through hole and is pivotally connected with the connecting rod 52; and the second end of the connecting rod 52 is provided with a second through hole coaxial with the second pin shaft 32, the second pin shaft 32 is inserted into the second through hole and is pivotally connected with the connecting rod 52.

[0039] Thus, the two ends of the connecting rod 52 are pivotally connected with the first pin shaft 11 and the second pin shaft 32 respectively.

[0040] It can be understood that the connecting rod 52 is sleeved on the first pin shaft 11 through the first through hole.

[0041] It can be understood that the connecting rod 52 is sleeved on the second pin shaft 32 through the second through hole.

[0042] In some embodiments, as shown in FIG. 1, the oil passage includes a first oil channel 13, a second oil channel 111, a third oil channel 521 and a fourth oil channel 321. Figure 1 The first pin shaft 11 and the first through hole form a second cooperation gap, the first oil channel 13 is arranged on the star wheel 10 and communicates the second cooperation gap and the oil chamber 4. The first pin shaft 11 and the first through hole form a third cooperation gap, the second oil channel 111 is arranged on the first pin shaft 11 and communicates the second cooperation gap and the third cooperation gap.

[0043] The second pin shaft 32 and the second through hole form a fourth cooperation gap, the third oil channel 521 is arranged on the connecting rod 52 and communicates the third cooperation gap and the fourth cooperation gap. The second pin shaft 32 and the second through hole form a fifth cooperation gap, the fourth oil channel 321 is arranged on the second pin shaft 32 and communicates the fourth cooperation gap and the fifth cooperation gap, and the oil outlet channel 31 communicates the fifth cooperation gap and the first cooperation gap.

[0044] Thus, first, the lubricating oil in the oil chamber 4 enters the second cooperation gap through the first oil channel 13, and the lubricating oil in the second cooperation gap enters the third cooperation gap through the second oil channel 111.

[0045] Thus, the lubricating oil in the third cooperation gap enters the fourth cooperation gap through the third oil channel 521, and the lubricating oil in the fourth cooperation gap enters the fifth cooperation gap through the fourth oil channel 321.

[0046] A first oil film is formed, which surrounds the circumference of the first pin shaft 11 and lubricates the first pin shaft 11 and the first through hole.

[0047] Secondly, the lubricating oil in the second fitting gap enters the third fitting gap through the second oil channel 111, and a second oil film is formed in the third fitting gap

[0048] Secondly, the lubricating oil in the second fitting gap enters the third fitting gap through the second oil channel 111, and a second oil film is formed in the third fitting gap

[0049] A third oil film is formed, which surrounds the circumference of the second pin shaft 32 and lubricates the second pin shaft 32 and the second through hole.

[0050] Thirdly, the lubricating oil in the fourth fitting gap enters the fifth fitting gap through the fourth oil channel 321, and a fourth oil film is formed in the fifth fitting gap, which surrounds the circumference of the second pin shaft 32 and lubricates the second pin shaft 32 and the second through hole.

[0051] Finally, the lubricating oil in the fifth fitting gap enters the first fitting gap through the oil outlet channel 31, and lubricates the slider 3 and the slide channel 51.

[0052] Specifically, the third oil channel 521 extends in the length direction of the connecting rod 52.

[0053] In some embodiments, as shown in Figure 1 and Figure 2 Specifically, the first oil channel 13 includes a fifth oil channel 131, a sixth oil channel 132 and a seventh oil channel 133, the wall of the first mounting groove 12 is formed by the first star wheel 1, which further includes a first bottom wall, the first bottom wall and the first opening are opposite in the radial direction of the first star wheel 1, the fifth oil channel 131 is formed in the first bottom wall and extends in the axial direction of the first star wheel 1, the sixth oil channel 132 extends in the radial direction of the first star wheel 1 and connects the oil chamber 4 and the fifth oil channel 131. The seventh oil channel 133 has two and is arranged on the first side wall and the second side wall, respectively, and the two seventh oil channels 133 and the two second fitting gaps are one-to-one corresponding, and the seventh oil channel 133 extends in the radial direction of the first star wheel 1 and connects the corresponding second fitting gap and the fifth oil channel 131.

[0054] Therefore, the lubricating oil in the oil chamber 4 enters the fifth oil channel 131 through the sixth oil channel 132, then enters the two seventh oil channels 133 through the fifth oil channel 131, and then enters the second fitting gap through the seventh oil channel 133, thereby achieving lubrication of the second fitting gap.

[0055] Specifically, the sixth oil channel 132 is arranged at the middle of the fifth oil channel 131 in the axial direction thereof.

[0056] Preferably, the fifth oil channel 131 is respectively penetrated through the first bottom wall at two ends thereof, and the lubricating structure further comprises first threaded plugs, two of which are respectively installed at the two ends of the fifth oil channel 131.

[0057] In this way, the fifth oil channel 131 is conveniently formed in the first bottom wall, and the two first threaded plugs are used to plug the two ends of the fifth oil channel 131, so as to prevent lubricating oil from overflowing from the ends of the fifth oil channel 131.

[0058] In some embodiments, as shown in Figure 1 and Figure 2 The second oil channel 111 comprises an eighth oil channel 1111, a ninth oil channel 1112 and a tenth oil channel 1113. The eighth oil channel 1111 is coaxially arranged in the first pin shaft 11. The ninth oil channel 1112 is equal in number to the second matching gaps and corresponds to each second matching gap. The ninth oil channel 1112 extends in the radial direction of the first pin shaft 11 and communicates the corresponding second matching gap and the eighth oil channel 1111. The tenth oil channel 1113 extends in the radial direction of the first pin shaft 11 and cross-communicates the eighth oil channel 1111. The two ends of the tenth oil channel 1113 communicate the third matching gaps.

[0059] In this way, the lubricating oil in the second matching gap enters the eighth oil channel 1111 through the ninth oil channel 1112, then enters the tenth oil channel 1113 through the eighth oil channel 1111, and finally enters the third matching gap through the tenth oil channel 1113, so as to realize the lubrication of the third matching gap.

[0060] Preferably, the two ends of the eighth oil channel 1111 are respectively penetrated through the first pin shaft 11, and the lubricating structure further comprises second threaded plugs, two of which are respectively installed at the two ends of the eighth oil channel 1111.

[0061] In this way, the eighth oil channel 1111 is conveniently formed in the first pin shaft 11, and the two second threaded plugs are used to plug the two ends of the eighth oil channel 1111, so as to prevent lubricating oil from overflowing from the ends of the eighth oil channel 1111.

[0062] In some embodiments, as shown in Figure 1 and Figure 2 The fourth oil channel 321 comprises an eleventh oil channel 3211, a twelfth oil channel 3212 and a thirteenth oil channel 3213. The eleventh oil channel 3211 is coaxially arranged in the second pin shaft 32. The twelfth oil channel 3212 extends in the radial direction of the second pin shaft 32 and cross-communicates the eleventh oil channel 3211. The two ends of the twelfth oil channel 3212 communicate the fourth matching gaps. The thirteenth oil channel 3213 is equal in number to the fifth matching gaps and corresponds to each fifth matching gap. The thirteenth oil channel 3213 extends in the radial direction of the second pin shaft 32 and cross-communicates the eleventh oil channel 3211. The two ends of the thirteenth oil channel 3213 communicate the corresponding fifth matching gaps.

[0063] Therefore, the lubricating oil in the fourth mating clearance enters the eleventh oil passage 3211 through the twelfth oil passage 3212, then enters the thirteenth oil passage 3213 through the eleventh oil passage 3211, and finally enters the fifth mating clearance through the thirteenth oil passage 3213. This achieves lubrication for the fifth mating clearance.

[0064] It should be noted that the lubrication structure also includes a plunger 55 and a sealing assembly 56. The plunger 55 is located in the slide 51 and connected to the slider 3. The sealing assembly 56 is fixed to the slide 51 and divides the slide 51 into a first chamber and a second chamber. The first chamber is connected to the oil outlet 31. The plunger 55 is slidably inserted into the sealing assembly 56. The pump body 5 has a water chamber that communicates with the second chamber.

[0065] Thus, the sealing component 56 is used to isolate the lubricating oil in the first chamber and the water in the second chamber, thereby preventing the lubricating oil and water from mixing and ensuring the purity of the lubricating oil.

[0066] like Figure 1 As shown, the plunger pump according to an embodiment of the present invention includes a lubrication structure as described in any of the above embodiments, and further includes a pump body 5, a crankshaft 53, a rotary joint 6, a gear pump, and pipes. The crankshaft 53 is rotatably mounted on the pump body 5. Multiple lubrication structures are distributed axially along the crankshaft 53. The crankshaft 53 includes shaft segments corresponding to each lubrication structure. An eccentric disc in each lubrication structure is formed on a corresponding shaft segment. The crankshaft 53 is provided with a main oil passage 531 extending axially therein, which communicates with each of the first oil inlet passages 532 of the multiple lubrication structures. Either end of the main oil passage 531 forms an oil supply port communicating with the outside. The rotary joint 6 is mounted on the oil supply port. The gear pump is connected to the rotary joint 6 and adapted to supply lubricating oil to the main oil passage 531 through the rotary joint 6. The number of pipes and lubrication structures is equal and corresponds one-to-one. The pipes connect the slide rails 51 in the corresponding lubrication structures to the gear pump, so that the lubricating oil in the slide rails 51 can flow back to the gear pump through the corresponding pipes.

[0067] Therefore, the rotary joint 6 is used to connect the main oil passage 531 and the gear pump. The gear pump is used to pump lubricating oil into the main oil passage 531. The lubricating oil in the main oil passage 531 enters the oil chamber 4 through multiple first oil inlets 532, which facilitates simultaneous entry into multiple lubrication structures and achieves synchronous lubrication of the working parts of the plunger pump.

[0068] In addition, the pipeline enables the recycling of lubricating oil and avoids the accumulation of lubricating oil in the slide 51, which would affect the sliding effect of the slider 3, thus ensuring the reliability of the plunger pump.

[0069] The other technical advantages of the plunger pump in this embodiment are the same as the technical advantages of the lubrication structure of the plunger pump in the above embodiment, and will not be repeated here.

[0070] Specifically, there are two lubrication structures.

[0071] Among them, rotary joint 6 is a quick rotary joint, and the quick rotary joint is threadedly connected to the oil supply port.

[0072] In some embodiments, such as Figure 1 As shown, the plunger pump also includes crankshaft bearings 54. There are multiple crankshaft bearings 54 and they are spaced apart in the axial direction of the crankshaft 53. The crankshaft bearings 54 are installed between the crankshaft 53 and the pump body 5. The crankshaft 53 is provided with a second oil inlet passage 533 extending in its radial direction. The number of second oil inlet passages 533 and crankshaft bearings 54 are equal and correspond one-to-one. The second oil inlet passage 533 connects the main oil passage 531 and the corresponding crankshaft bearing 54.

[0073] Therefore, the lubricating oil in the main oil passage 531 enters the crankshaft bearing 54 through the second oil inlet passage 533, thereby achieving lubrication of the crankshaft bearing 54.

[0074] Specifically, there are two crankshaft bearings 54, which are located on both sides of the two lubrication structures.

[0075] In addition, the oil pressure and flow rate of the lubricating oil can be effectively controlled by the size design of the main oil passage 531, the selection of the gear pump, and the adjustment of the speed.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0079] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0080] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0081] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A lubricating structure of a plunger pump characterized by comprising: The application relates to a plunger pump, comprising: an eccentric disc rotatably mounted in a pump body of the plunger pump; a star wheel sleeved on the eccentric disc, and two sealing bearings mounted between an inner circumferential surface of the star wheel and an outer circumferential surface of the eccentric disc, the two sealing bearings being axially spaced apart from each other, the eccentric disc, the star wheel and the two sealing bearings forming an oil chamber, and the eccentric disc being provided with a first oil inlet channel communicating the oil chamber with the outside; a sliding block provided with a sliding channel in the pump body, the sliding block being slidably fitted in the sliding channel and forming a first fitting gap with the sliding channel, the sliding block being in transmission connection with the star wheel, and the sliding block being provided with an oil outlet channel communicating the oil chamber with the first fitting gap; the plunger pump further comprising a plurality of crankshaft bearings axially spaced apart from each other, the crankshaft bearings being mounted between the crankshaft and the pump body, the crankshaft being provided with a second oil inlet channel extending in a radial direction of the crankshaft, and the crankshaft being provided with a main oil channel extending in an axial direction of the crankshaft, the number of the second oil inlet channels being equal to that of the crankshaft bearings, and each of the second oil inlet channels being in communication with the main oil channel and a corresponding crankshaft bearing; a first pin shaft, a second pin shaft and a connecting rod, the first end of the connecting rod being provided with a first through hole coaxial with the first pin shaft, and the second end of the connecting rod being provided with a second through hole coaxial with the second pin shaft; the star wheel, the first pin shaft, the connecting rod and the second pin shaft jointly forming an oil path communicating the oil chamber and the oil outlet channel, the oil path comprising: a first oil channel, the first pin shaft and a first through hole forming a second fitting gap, the first oil channel being formed in the star wheel and being in communication with the second fitting gap and the oil chamber; a second oil channel, the first pin shaft and the first through hole forming a third fitting gap, the second oil channel being formed in the first pin shaft and being in communication with the second fitting gap and the third fitting gap; a third oil channel, the second pin shaft and the second through hole forming a fourth fitting gap, the third oil channel being formed in the connecting rod and being in communication with the third fitting gap and the fourth fitting gap; and a fourth oil channel, the second pin shaft and a second through hole forming a fifth fitting gap, the fourth oil channel being formed in the second pin shaft and being in communication with the fourth fitting gap and the fifth fitting gap, and the oil outlet channel being in communication with the fifth fitting gap and the first fitting gap.

2. The lubricating structure of a plunger pump according to claim 1, characterized by Further comprising: the first pin shaft being fixedly arranged on the star wheel; the second pin shaft being fixedly arranged on the sliding block; and the two ends of the connecting rod being pivotally connected with the first pin shaft and the second pin shaft respectively. ​ 3. The lubricating structure of a plunger pump according to claim 2, characterized by The star wheel is provided with a first installation slot, a first opening is formed towards the end of the slider, the wall of the first installation slot comprises a first side wall and a second side wall, the first side wall and the second side wall are opposite in the axial direction of the star wheel, and the first side wall and the second side wall are both provided with a first through hole communicating with the first installation slot, the first pin shaft is matched in the two first through holes and the first installation slot, and the first end of the connecting rod is matched in the first installation slot through the first opening and is pivotally connected with the first pin shaft; The slider is provided with a second installation slot, a second opening is formed towards the end of the star wheel, the wall of the second installation slot comprises a third side wall and a fourth side wall, the third side wall and the fourth side wall are opposite in the axial direction of the star wheel, and the third side wall and the fourth side wall are both provided with a second through hole communicating with the second installation slot, the second pin shaft is matched in the two second through holes and the second installation slot, and the second end of the connecting rod is matched in the second installation slot through the second opening and is pivotally connected with the second pin shaft.

4. The lubricating structure of a plunger pump according to claim 3, characterized by The first pin shaft is inserted into the first through hole and is pivotally connected with the connecting rod; the second pin shaft is inserted into the second through hole and is pivotally connected with the connecting rod.

5. The lubricating structure of the plunger pump according to claim 3, characterized by The first oil passage comprises: A fifth oil passage and a sixth oil passage, the wall of the first installation slot of the star wheel further comprises a first bottom wall, the first bottom wall and the first opening are opposite in the radial direction of the star wheel, the fifth oil passage is opened in the first bottom wall and extends in the axial direction of the star wheel, and the sixth oil passage extends in the radial direction of the star wheel and communicates the oil chamber and the fifth oil passage; and A seventh oil passage, the seventh oil passage is two and is separately arranged on the first side wall and the second side wall, the two seventh oil passages and the two second matching gaps are one-to-one corresponding, the seventh oil passage extends in the radial direction of the star wheel and communicates the corresponding second matching gap and the fifth oil passage.

6. The lubricating structure of a plunger pump according to claim 5, wherein The second oil passage comprises: An eighth oil passage, the eighth oil passage is coaxially arranged in the first pin shaft; A ninth oil passage, the number of the ninth oil passage is equal to that of the second matching gap and is one-to-one corresponding, the ninth oil passage extends in the radial direction of the first pin shaft and communicates the corresponding second matching gap and the eighth oil passage; and A tenth oil passage, the tenth oil passage extends in the radial direction of the first pin shaft and cross communicates the eighth oil passage, and both ends of the tenth oil passage communicate with the third matching gap.

7. The lubricating structure of a plunger pump according to claim 3, wherein The fourth oil passage comprises: An eleventh oil passage, the eleventh oil passage is coaxially arranged in the second pin shaft; A twelfth oil passage, the twelfth oil passage extends in the radial direction of the second pin shaft and cross communicates the eleventh oil passage, and both ends of the twelfth oil passage communicate with the fourth matching gap; and Thirteenth oil channels, two in number and corresponding to two of the fifth matching gaps, extending in the radial direction of the second pin shaft and intersecting with the eleventh oil channels, both ends of the thirteenth oil channels communicating with the corresponding fifth matching gaps.

8. A piston pump characterized in that The lubricating structure of the plunger pump as claimed in any one of claims 1-7, further comprising: a pump body; a crankshaft rotatably mounted on the pump body, the lubricating structure being multiple in number and spaced apart in the axial direction of the crankshaft, the crankshaft comprising shaft segments corresponding to the lubricating structure, the eccentric discs in the lubricating structure being formed on the corresponding shaft segments, the crankshaft being provided with a main oil channel extending in the axial direction thereof, the main oil channel communicating with each of the first oil inlets of the multiple lubricating structures; a rotary joint mounted on either end of the main oil channel to form a lubricating oil supply port communicating with the outside; a gear pump connected to the rotary joint and adapted to deliver lubricating oil to the main oil channel through the rotary joint; and tubes equal in number to the lubricating structures and corresponding to the lubricating structures, the tubes connecting the slide channels in the corresponding lubricating structures and the gear pump to facilitate the return of lubricating oil in the slide channels to the gear pump through the corresponding tubes.

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