Input seal structure for emulsion pump

Abstract

The application discloses an input end sealing structure of an emulsion pump, which comprises a gear box shell, a gear shaft, a fixed distance ring, a transparent cover and a lip oil seal, the gear shaft is rotatably installed on the gear box shell through a rolling bearing, the rolling bearing is located on the input side of the gear box shell, the fixed distance ring, the transparent cover and the lip oil seal are all located on the side, away from the gear box shell, of the rolling bearing, the fixed distance ring is sleeved on the gear shaft and abuts against the inner ring of the rolling bearing, the transparent cover is sleeved on the fixed distance ring, the transparent cover is connected with the gear box shell and abuts against the outer ring of the rolling bearing, the lip oil seal is fitted between the fixed distance ring and the transparent cover, the lip of the lip oil seal faces the rolling bearing, an oil collecting cavity is formed between the transparent cover and the rolling bearing, and the gear box shell is provided with an oil return channel which is communicated with the oil collecting cavity and an oil pool inside the gear box shell. The input end sealing structure of the emulsion pump has the advantages that the rolling bearing at the input end of the emulsion pump has good cooling effect, and the input end is not prone to outward penetration of oil leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pumps, in particular to an input end sealing structure of an emulsion pump. BACKGROUND

[0002] As a kind of energy-saving product, reciprocating plunger pump can obtain high discharge pressure, flow and pressure independent, adapt to the wide range of delivery medium, good suction performance, high efficiency and performance does not change with pressure and delivery medium viscosity, plays an important role in coal mining, underground fracturing, oil exploitation, pipeline coal transportation, coal gasification, power plant slag, mining and other aspects. Taking the emulsion pump in reciprocating plunger pump as an example, it is a kind of device that converts electrical energy or other energy into mechanical energy, and converts the emulsion into hydraulic energy through internal structure. The emulsion pump in the related art has the defects of poor cooling effect of the rolling bearing at the input end, poor sealing effect of the input end and easy penetration of oil leakage. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, the input end sealing structure of the emulsion pump according to the embodiments of the present application has the advantages of good cooling effect of the rolling bearing at the input end of the emulsion pump and easy penetration of oil leakage from the input end.

[0005] The input end sealing structure of the emulsion pump according to the embodiments of the present application comprises a gear box shell, a gear shaft, a constant distance ring, a transparent cover and a lip oil seal, the gear shaft is rotatably mounted to the gear box shell by a rolling bearing, and the rolling bearing is located at the input side of the gear box shell; the constant distance ring, the transparent cover and the lip oil seal are located on the side of the rolling bearing away from the gear box shell, the constant distance ring is sleeved on the gear shaft and abuts against the inner ring of the rolling bearing, the transparent cover is sleeved on the constant distance ring, the transparent cover is connected with the gear box shell and abuts against the outer ring of the rolling bearing, the lip oil seal is fitted between the constant distance ring and the transparent cover, the lip of the lip oil seal faces the rolling bearing, the transparent cover and the rolling bearing form an oil collecting cavity, and the gear box shell has an oil return channel communicating the oil collecting cavity and an oil pool inside the gear box shell.

[0006] According to the input end sealing structure of the emulsion pump, the oil return channel is arranged on the gear box shell to communicate the oil pool and the oil collecting cavity on both sides of the rolling bearing, so that the lubricating oil in the oil collecting cavity has high flowability and better cooling effect on the rolling bearing. Moreover, no pressure difference exists on both sides of the rolling bearing, the oil collecting cavity has no large oil pressure, and the lubricating oil is not easy to seep out from the gap between the transparent cover and the spacing ring. In combination with the sealing of the gap between the transparent cover and the spacing ring by the lip oil seal, the input end of the emulsion pump is effectively prevented from seeping and leaking oil outward.

[0007] In some embodiments, one end of the oil return channel connected with the oil collecting cavity is higher than the other end connected with the oil pool, and the oil return channel is connected with the lower edge of the oil collecting cavity.

[0008] In some embodiments, the transparent cover has a first annular groove with an opening facing the roller region of the rolling bearing, the first annular groove forms at least part of the oil collecting cavity, and the outer side surface of the first annular groove is provided with a V-shaped groove with an opening upward, and the V-shaped groove is located at the lower edge of the oil collecting cavity.

[0009] In some embodiments, the first inclined surface and the second inclined surface on the transparent cover for forming the V-shaped groove are perpendicular to each other, and the first inclined surface and the second inclined surface are symmetrically arranged relative to the vertical surface.

[0010] In some embodiments, the spacing ring comprises a first ring segment and a second ring segment connected in sequence along the axial direction, the second ring segment is located on the side of the first ring segment away from the oil collecting cavity, the first ring segment is gap-fitted with the transparent cover, and the second ring segment and the transparent cover form an annular cavity for assembling the lip oil seal.

[0011] In some embodiments, the outer peripheral surface of the first ring segment is provided with an oil scraping groove extending helically along the axial direction of the first ring segment, and the rotation direction of the oil scraping groove is opposite to the rotation direction of the gear shaft.

[0012] In some embodiments, the inner peripheral surface of the spacing ring is provided with a second annular groove, and the input end sealing structure of the emulsion pump further comprises a first sealing ring fitted in the second annular groove.

[0013] In some embodiments, the side of the gear box shell facing the transparent cover is provided with a third annular groove, and the input end sealing structure of the emulsion pump further comprises a second sealing ring fitted in the third annular groove.

[0014] In some embodiments, the transparent cover is provided with a plurality of connecting holes spaced along the circumference of the transparent cover, the input side of the gear box shell is provided with threaded holes corresponding to the connecting holes one by one, and the transparent cover is connected to the gear box shell by threaded members passing through the connecting holes and screwing into the corresponding threaded holes.

[0015] In some embodiments, the plurality of threaded holes are arranged around the third annular groove. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a sectional view of an emulsion pump according to an embodiment of the present application.

[0017] Figure 2 is Figure 1 is an enlarged view of A in FIG.

[0018] Figure 3 is a sectional view of a gear box shell in an input end sealing structure of an emulsion pump according to an embodiment of the present application.

[0019] Figure 4 is a schematic view of a transparent cover in an input end sealing structure of an emulsion pump according to an embodiment of the present application.

[0020] Figure 5 is a sectional view of a transparent cover in an input end sealing structure of an emulsion pump according to an embodiment of the present application.

[0021] Figure 6 is a sectional view of a spacer ring in an input end sealing structure of an emulsion pump according to an embodiment of the present application.

[0022] REFERENCE SIGNS:

[0023] 100, emulsion pump; 1, gear box shell; 11, oil return channel; 12, oil pool; 13, third annular groove; 14, threaded hole; 2, gear shaft; 3, spacer ring; 31, oil scraping groove; 32, second annular groove; 4, transparent cover; 41, first annular groove; 42, V-shaped groove; 43, connecting hole; 5, lip oil seal; 6, rolling bearing; 7, first sealing ring; 8, second sealing ring. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0025] The input end sealing structure of an emulsion pump according to an embodiment of the present application is described below in combination with Figures 1-6

[0026] As Figures 1-6 ​As shown, the input end sealing structure of the emulsion pump according to the embodiment of the present application comprises a gear box shell 1, a gear shaft 2, a spacer ring 3, a transparent cover 4 and a lip oil seal 5. The gear shaft 2 is rotatably installed on the gear box shell 1 through a rolling bearing 6, and the rolling bearing 6 is located at the input side of the gear box shell 1. The left side of the outer ring of the rolling bearing 6 abuts against the input side of the gear box shell 1, and the left side of the inner ring of the rolling bearing 6 abuts against the shaft shoulder of the gear shaft 2.

[0027] The spacer ring 3, the transparent cover 4 and the lip oil seal 5 are all located at the side of the rolling bearing 6 away from the gear box shell 1, and the spacer ring 3 is sleeved on the gear shaft 2 and abuts against the inner ring of the rolling bearing 6. Specifically, the left side of the spacer ring 3 abuts against the right side of the inner ring of the rolling bearing 6 and rotates simultaneously with the gear shaft 2, and the right side of the spacer ring 3 is sequentially fitted with a coupling and a pressing plate, and the pressing plate is connected to the end of the gear shaft 2 through bolts to press the pressing plate, the coupling, the spacer ring 3 and the rolling bearing 6 tightly on the shaft shoulder of the gear shaft 2.

[0028] The transparent cover 4 is sleeved on the spacer ring 3, and the transparent cover 4 is connected to the gear box shell 1 and abuts against the outer ring of the rolling bearing 6, thereby achieving the limiting of the rolling bearing 6. The lip oil seal 5 is fitted between the spacer ring 3 and the transparent cover 4, and the lip of the lip oil seal 5 faces the rolling bearing 6. An oil collecting cavity is formed between the transparent cover 4 and the rolling bearing 6, and the gear box shell 1 has an oil return channel 11 communicating the oil collecting cavity and an oil pool 12 inside the gear box shell 1.

[0029] According to the input end sealing structure of the emulsion pump according to the embodiment of the present application, the oil return channel 11 communicating the oil pool 12 on both sides of the rolling bearing 6 and the oil collecting cavity is arranged on the gear box shell 1, thereby the flowability of the lubricating oil in the oil collecting cavity is high, and the cooling effect on the rolling bearing 6 is better. Moreover, no pressure difference exists on both sides of the rolling bearing 6, and the oil collecting cavity does not have a large oil pressure, and the lubricating oil is not easy to seep out from the gap between the transparent cover 4 and the spacer ring 3, and in combination with the sealing of the gap between the transparent cover 4 and the spacer ring 3 by the lip oil seal 5, thereby effectively avoiding the outward seepage and leakage of the emulsion pump at the input end.

[0030] In some embodiments, the end of the oil return channel 11 connected to the oil collecting cavity is higher than the end of the oil return channel 11 connected to the oil pool 12, and the oil return channel 11 is connected to the lower edge of the oil collecting cavity.

[0031] As shown, Figure 1 In actual use, the axial direction of the gear shaft 2 of the emulsion pump 100 is horizontal, and the upper end of the oil return channel 11 is connected to the lower edge of the oil collecting cavity, thereby facilitating the flow of the lubricating oil in the oil collecting cavity to the oil pool 12. Especially when the emulsion pump 100 stops working, the lubricating oil in the oil collecting cavity can almost all flow to the oil pool 12 under the action of gravity, effectively avoiding the slow seepage and leakage of the lubricating oil in the oil collecting cavity.

[0032] In some embodiments, asFigure 2 、 Figure 4 and Figure 5 As shown in

[0033] By setting the V-shaped groove 42 at the lower edge of the oil collecting cavity, the accumulation of lubricating oil in the oil collecting cavity is effectively achieved, and the lubricating oil in the oil collecting cavity is further facilitated to flow back to the oil pool 12, thereby further reducing the risk of oil leakage at the input end of the emulsion pump.

[0034] In some embodiments, as shown in Figure 4 The first inclined surface and the second inclined surface on the transparent cover 4 for forming the V-shaped groove 42 are perpendicular to each other, and the first inclined surface and the second inclined surface are symmetrically arranged relative to the vertical surface. Thus, the accumulation efficiency of lubricating oil in the oil collecting cavity is further improved.

[0035] In some embodiments, the spacer ring 3 includes a first ring segment and a second ring segment connected in sequence along the axial direction thereof, the second ring segment is located on the side of the first ring segment away from the oil collecting cavity, the first ring segment is gap-fitted with the transparent cover 4, and the second ring segment and the transparent cover 4 form an annular cavity for assembling the lip oil seal 5. The lip oil seal 5 is a rotary seal. By gap-fitting the first ring segment with the transparent cover 4, the lubricating oil in the oil collecting cavity first passes through the gap between the first ring segment and the transparent cover 4, and then enters the annular cavity formed between the second ring segment and the transparent cover 4, thereby effectively avoiding direct impact of the lubricating oil in the oil collecting cavity on the lip oil seal 5, and ensuring the sealing effect of the lip oil seal 5.

[0036] In some embodiments, as shown in Figure 2 and Figure 6 The outer peripheral surface of the first ring segment is provided with a scraping groove 31 extending helically along the axial direction of the first ring segment, and the rotation direction of the scraping groove 31 is opposite to the rotation direction of the gear shaft 2.

[0037] That is, when the emulsion pump 100 is working, the direction in which the gear shaft 2 drives the rotation of the spacer ring 3 is opposite to the rotation direction of the scraping groove 31, and then the scraping groove 31 scrapes the lubricating oil in the gap between the first ring segment and the transparent cover 4 towards the direction of the oil collecting cavity, thereby further preventing the lubricating oil in the oil collecting cavity from leaking out.

[0038] It should be noted that the scraping groove 31 can also be provided on the inner peripheral surface of the transparent cover 4 that cooperates with the first ring segment.

[0039] In some embodiments, as shown in Figure 2 and Figure 6As shown, the inner circumferential surface of the constant-diameter ring 3 is provided with a second annular groove 32, and the input end sealing structure of the emulsion pump further comprises a first sealing ring 7, which is fitted in the second annular groove 32. The first sealing ring 7 is pressed against the circumferential surface of the gear shaft 2, thereby effectively ensuring the sealing of the connection between the constant-diameter ring 3 and the gear shaft 2 and further avoiding the leakage of lubricating oil.

[0040] In some embodiments, as shown in Figure 2 and Figure 3 As shown, the side of the transparent cover 4 facing the gear box shell 1 is provided with a third annular groove 13, and the input end sealing structure of the emulsion pump further comprises a second sealing ring 8, which is fitted in the third annular groove 13. The second sealing ring 8 is pressed against the side of the transparent cover 4 facing the gear box shell 1, thereby effectively ensuring the sealing of the connection between the transparent cover 4 and the gear box shell 1 and further avoiding the leakage of lubricating oil.

[0041] In some embodiments, as shown in Figures 2-4 As shown, the transparent cover 4 is provided with a plurality of connection holes 43 distributed along the circumference of the transparent cover 4, and the input side of the gear box shell 1 is provided with threaded holes 14 corresponding to the connection holes 43. The transparent cover 4 is connected to the gear box shell 1 by threaded members passing through the connection holes 43 and screwing into the corresponding threaded holes 14.

[0042] The threaded member is a bolt, which passes through the connection hole 43 and is screwed into the corresponding threaded hole 14, thereby realizing the connection of the transparent cover 4 and the gear box shell 1, and facilitating the disassembly and assembly of the transparent cover 4 with high connection strength.

[0043] In some embodiments, as shown in Figure 3 As shown, the plurality of connection holes 43 are arranged around the third annular groove 13. That is, the connection holes 43 are located radially outside the third annular groove 13 on the transparent cover 4, thereby effectively preventing the lubricating oil in the oil collection cavity from penetrating outward through the connection holes 43 and further avoiding the leakage of lubricating oil.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, the terms "first", "second", etc. are used only to describe different instances, and are not used to indicate or imply relative importance or a number of indications of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. 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.

[0047] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0048] 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 conjunction 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.

[0049] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An inlet sealing structure for an emulsion pump, characterized in that, include: A gearbox housing and a gear shaft, wherein the gear shaft is rotatably mounted to the gearbox housing via a rolling bearing located on the input side of the gearbox housing; as well as The gearbox includes a spacer ring, a through cover, and a lip seal. The spacer ring, through cover, and lip seal are all located on the side of the rolling bearing away from the gearbox housing. The spacer ring is fitted onto the gear shaft and abuts against the inner ring of the rolling bearing. The through cover is fitted onto the spacer ring, connected to the gearbox housing, and abuts against the outer ring of the rolling bearing. The lip seal fits between the spacer ring and the through cover, with its lip facing the rolling bearing. The through cover and the rolling bearing form an oil collection chamber. The gearbox housing has an oil return channel connecting the oil collection chamber and an internal oil sump within the gearbox housing. The spacer ring includes a first ring segment and a second ring segment connected sequentially along its axial direction. The second ring segment is located on the side of the first ring segment away from the oil collection cavity. The first ring segment is clearance-fitted with the through cover. The second ring segment and the through cover form an annular cavity for assembling the lip seal. The outer circumferential surface of the first ring segment is provided with an oil scraping groove that extends spirally along the axial direction of the first ring segment. The direction of rotation of the oil scraping groove is opposite to the direction of rotation of the gear shaft.

2. The inlet sealing structure of the emulsion pump according to claim 1, characterized in that, The end of the oil return channel connected to the oil collection chamber is higher than the end of the oil return channel connected to the oil sump, and the lower edge of the oil return channel is connected to the oil collection chamber.

3. The inlet sealing structure of the emulsion pump according to claim 1, characterized in that, The cover has a first annular groove with an opening facing the roller region of the rolling bearing. The first annular groove forms at least a portion of the oil collecting cavity. The outer side of the first annular groove has an upward-opening V-shaped groove located at the lower edge of the oil collecting cavity.

4. The inlet sealing structure of the emulsion pump according to claim 3, characterized in that, The first and second inclined surfaces on the transparent cover that form the V-shaped groove are perpendicular to each other, and the first and second inclined surfaces are arranged symmetrically in a vertical direction.

5. The inlet sealing structure of the emulsion pump according to claim 1, characterized in that, The inner circumferential surface of the fixed-distance ring is provided with a second annular groove, and the input end sealing structure of the emulsion pump also includes a first sealing ring, which fits in the second annular groove.

6. The inlet sealing structure of the emulsion pump according to claim 1, characterized in that, The gearbox housing has a third annular groove on the side facing the transparent cover, and the input end sealing structure of the emulsion pump also includes a second sealing ring, which fits into the third annular groove.

7. The inlet sealing structure of the emulsion pump according to claim 6, characterized in that, The through cover has a plurality of connecting holes spaced apart along the circumference of the through cover, and the input side of the gearbox housing has threaded holes that correspond one-to-one with the connecting holes. The through cover is connected to the gearbox housing through a threaded component that passes through the connecting holes and is threaded into the corresponding threaded holes.

8. The inlet sealing structure of the emulsion pump according to claim 7, characterized in that, Multiple threaded holes are arranged around the third annular groove.

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