An emulsion pump and its power end

Abstract

The present invention discloses a power end of an emulsion pump and an emulsion pump, and belongs to the field of design and manufacture of emulsion pumps. The power end of the emulsion pump includes: a crankcase, and at least one gear pair and a crank slider mechanism located in the crankcase; wherein the input gear shaft of the gear pair is used to connect with the output shaft of the main drive motor; the crankshaft of the crank slider mechanism is connected with the output gear of the gear pair, and the slider of the crank slider mechanism is slidably connected to the crankcase; an end cover is arranged between the input gear shaft and the crankcase, and at least one sealing member and at least one transposition ring are arranged between the end cover and the input gear shaft, the outer wall of the transposition ring is in clearance with the end cover, and the inner wall of the transposition ring has a clearance with the input gear shaft. The present invention solves the problem of high maintenance cost caused by unreasonable structural design of the power end of the existing emulsion pump.

Description

Technical Field

[0001] The invention relates to the field of emulsion pumps, and in particular to an emulsion pump and a power end thereof. Background Art

[0002] Emulsion pumps are used in coal mining working faces to provide emulsion for hydraulic supports. Emulsion pumps are a device that uses emulsion or water as a medium, drives the plunger to reciprocate by the rotation of the crankshaft to achieve liquid suction and discharge, and then converts it into hydraulic energy of the emulsion.

[0003] At present, the power end structure of the emulsion pump is relatively mature, and all emulsion pump manufacturers use a crank slider mechanism, which has a mature production process and relatively low manufacturing cost. Since the emulsion pump is used in the coal mining face to provide hydraulic power for the hydraulic support, it has a long continuous working time, so the reliability requirements of each part are high. In the existing emulsion pump, the input shaft coupling end seal adopts a single lip-type oil seal circumferential seal, which has poor sealing effect and is prone to oil leakage. In addition, the input shaft where the oil seal lip contacts the input shaft will wear and produce grooves under long-term operation. Even if a new oil seal is replaced, it cannot be effectively sealed, and oil leakage is likely to occur again. Reliable sealing can only be achieved by replacing the input shaft, resulting in high maintenance costs. In addition, the gap between the bearing at the coupling end of the input shaft and its end cover is prone to oil leakage after oil is stored, affecting the seal between the end cover and the input shaft. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the unreasonable structural design of the power end of the existing emulsion pump leads to high maintenance cost.

[0005] In view of the above technical problems, the present invention provides the following technical solutions:

[0006] A power end of an emulsion pump, comprising: a crankcase, and at least one gear pair and a crank slider mechanism located in the crankcase; wherein the input gear shaft of the gear pair is used to be connected to the output shaft of a main drive motor; the crankshaft of the crank slider mechanism is connected to the output gear of the gear pair, and the slider of the crank slider mechanism is slidably connected to the crankcase; an end cover is arranged between the input gear shaft and the crankcase, and at least one sealing member and at least one transposition ring are arranged between the end cover and the input gear shaft, the outer wall of the transposition ring is gap-matched with the end cover, and the inner wall of the transposition ring has a gap with the input gear shaft.

[0007] In some implementations of the present application, two transposition rings are arranged between the end cover and the input gear shaft, and the two transposition rings have different thicknesses.

[0008] In some embodiments of the present application, the inner wall of the end cover is provided with a shoulder, and the seal and the transposition ring are installed in the area between the shoulder and the outer end surface of the end cover.

[0009] In some implementations of the present application, the end cover is disposed on a side of the input gear shaft connected to the main drive motor.

[0010] In some implementations of the present application, a first bearing is sleeved on the input gear shaft, and an end surface of the end cover abuts against the first bearing.

[0011] In some embodiments of the present application, the end cover and the input gear shaft have a lubrication gap in the axial direction in the area between the seal and the first bearing, and the end cover is provided with a lubrication input hole connected to the main lubrication oil hole of the crankcase, and the lubrication input hole is connected to the lubrication gap.

[0012] In some embodiments of the present application, the end cover is provided with a first oil inlet groove connected to the lubrication gap on the end face that cooperates with the first bearing, and the lubrication input hole includes a first input blind hole arranged on the outer wall of the end cover and extending radially, and a second input hole arranged on the first oil inlet groove and connected to the first input blind hole.

[0013] In some embodiments of the present application, a second oil inlet groove connected to the first input blind hole is provided on the outer wall of the end cover, the main lubricating oil hole of the crankcase is connected to the second oil inlet groove, and the second oil inlet groove extends along the circumference of the end cover.

[0014] In some embodiments of the present application, an oil return groove connected to the lubrication gap is provided on the end face of the end cover that cooperates with the first bearing, and the crankcase is provided with a first oil return hole corresponding to the oil return groove, and the lubricating oil between the end cover and the input gear shaft flows back to the crankcase through the oil return groove and the first oil return hole.

[0015] The present invention also provides an emulsion pump, which comprises the power end of the emulsion pump.

[0016] The technical solution of the present invention has the following technical effects compared with the prior art:

[0017] In the power end of the emulsion pump provided by the present invention, by arranging at least one sealing member and at least one transposition ring in the sealing area between the end cover and the input gear shaft, when the emulsion pump is operated for a long time without stopping and the input gear shaft is worn out at the position where the sealing member cooperates, during equipment maintenance, the axial position of the transposition ring and the sealing member is replaced so that the sealing member cooperates with the unworn section of the input gear shaft, thereby greatly reducing the maintenance cost of the equipment while ensuring the sealing performance.

[0018] Furthermore, in the power end of the emulsion pump of the present invention, an oil return groove connected to the lubrication gap is provided on the end face of the end cover that matches the first bearing, and a first oil return hole corresponding to the oil return groove is provided in the crankcase, and the lubricating oil flows back into the crankcase through the oil return groove and the first oil return hole. This avoids the problem that too much lubricating oil in the lubrication gap causes the lubricating oil to leak outward from the matching surface of the seal and the input gear shaft, resulting in poor sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0020] Figure 1 It is a structural schematic diagram of a specific implementation mode of the power end of the emulsion pump of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of part C;

[0022] Figure 3 for Figure 1 A magnified view of part B;

[0023] Figure 4 for Figure 1 Sectional view of EE;

[0024] Figure 5 It is a structural schematic diagram of a specific implementation mode of the end cover in the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figure 1 The figure shows a specific embodiment of the power end of an emulsion pump of the present invention, which comprises: a crankcase 100 and at least one gear pair and a slider crank mechanism located in the crankcase 100; wherein the input gear shaft 200 of the gear pair is used to connect with the output shaft of the main drive motor (not shown in the figure); the crankshaft 300 of the slider crank mechanism is connected with the output gear 400 of the gear pair, and the slider of the slider crank mechanism is slidably connected to the crankcase 100. During the operation of the emulsion pump, the main drive motor drives the input gear shaft 200 to rotate, the input gear shaft 200 is meshed with the output gear 400, and drives the crankshaft 300 of the slider crank mechanism to rotate, the rotation of the crankshaft 300 drives the slider to slide along the crankcase 100, and the sliding of the slider drives the movement of the plunger, thereby causing the hydraulic change of the pump head assembly of the emulsion pump to pump the emulsion.

[0030] like Figure 2 As shown, an end cover 500 is arranged between the input gear shaft 200 of the emulsion pump and the crankcase 100, at least one sealing member 600 and at least one transposition ring 700 are arranged between the end cover 500 and the input gear shaft 200, the outer wall of the transposition ring 700 is clearance-matched with the end cover 500, and the inner wall of the transposition ring 700 has a clearance with the input gear shaft 200. Since the end cover 500 and the input gear shaft 200 need to be directly connected in a dynamic seal, the sealing member 600 is specifically a lip oil seal.

[0031] The power end of the emulsion pump is provided with at least one sealing member 600 and at least one transposition ring 700 between the end cover 500 and the input gear shaft 200. When the emulsion pump is operated for a long time without stopping and the input gear shaft 200 is worn out at the position where the sealing member 600 cooperates, during equipment maintenance, in the sealing area between the end cover 500 and the input gear shaft 200, the axial position of the transposition ring 700 and the sealing member 600 is replaced so that the sealing member 600 cooperates with the unworn section of the input gear shaft 200, thereby achieving good sealing effect and reducing the maintenance cost of the equipment.

[0032] Specifically, a seal 600 and a transposition ring 700 may be arranged between the end cover 500 and the input gear shaft 200, or, in order to allow the position of the seal 600 to have a wider adjustment range, two or more seals 600 and two or more transposition rings 700 may be arranged, and the service life of the input gear shaft 200 may be extended by position adjustment of multiple seals 600 and multiple transposition rings 700.

[0033] Specifically, Figure 2 As shown, in order to take into account both cost and assembly convenience, two or more transposition rings 700 are arranged between the end cover 500 and the input gear shaft 200, and the thickness of the two transposition rings 700 is different. In this way, the seal 600 can cooperate with the two transposition rings 700 to achieve cooperation in more positions.

[0034] Specifically, the sealing area between the end cover 500 and the input gear shaft 200 is formed in a variety of ways. In one embodiment, Figure 2 As shown, the inner wall of the end cover 500 is provided with a shoulder 501 , and the area between the shoulder 501 and the outer end surface of the end cover 500 forms the sealing area, and the sealing member 600 and the transposition ring 700 are installed in the sealing area.

[0035] like Figure 2As shown, the present invention sets a first transposition ring 700a, a first lip oil seal 600a, a second transposition ring 700b, and a second lip oil seal 600b in the sealing area from the shoulder to the outer end surface of the end cover 500. When the emulsion pump is operated for a long time and the input gear shaft 200 and the lip oil seal are worn, the first transposition ring 700a and the second transposition ring 700b are axially transposed, and the order after the second assembly is: the second transposition ring 700b, the first lip oil seal 600a, the first transposition ring 700a, and the lip oil seal 600b. Since the widths of the two transposition rings are different, the inner lip oil seal is in circumferential contact with the unworn shaft diameter after the transposition, thereby improving the sealing effect. When the emulsion pump is operated for a long time again after the second repair and the input gear shaft 200 and the lip oil seal are worn, the second transposition ring 700b and the lip oil seal are axially transposed. The order after the third assembly is: the first lip oil seal 600a, the second transposition ring 700b, the first transposition ring 700a, the second lip oil seal 600b. Since the lip oil seal is in circumferential contact with the unworn shaft diameter after the transposition, the sealing effect is improved. After three assemblies (including the above two transposition assemblies), the service life of the emulsion pump can be extended by the following secondary assembly method, specifically: assembly order 1 is the first lip oil seal 600a, the first transposition ring 700a, the second lip oil seal 600b (without the second transposition ring 700b); assembly order 2 is the first lip oil seal 600a, the second transposition ring 700b, the second lip oil seal 600b (without the first transposition ring 700a). It can be seen that by providing two transposition rings 700 with different thicknesses and two seals 600, five sealing connection modes can be achieved, which greatly improves the service life of the input gear shaft.

[0036] Specifically, the end cover 500 is disposed on a side of the input gear shaft 200 connected to the main drive motor.

[0037] Specifically, a first bearing 800 is sleeved on the input gear shaft 200 , and an end surface of the end cover 500 abuts against the first bearing 800 .

[0038] In order to provide lubrication space for the first bearing 800, as Figure 3 As shown, the end cover 500 and the input gear shaft 200 have a lubrication gap A in the axial direction in the area between the seal 600 and the first bearing 800. The end cover 500 is provided with a lubrication input hole 502 connected to the main lubrication oil hole of the crankcase. The lubrication input hole 502 is connected to the lubrication gap A, and the lubrication oil from the main lubrication pipeline of the crankcase can flow into the lubrication gap A along the lubrication input hole 502.

[0039] Specifically, the oil inlet structure on the end cover 500 is as follows: the end cover 500 is provided with a first oil inlet groove 503 communicating with the lubrication gap A on the end surface matched with the first bearing 800, and the lubrication input hole 502 includes a first input blind hole 5021 provided on the outer wall of the end cover 500 and extending radially, and a second input hole 5022 provided on the first oil inlet groove 503 and communicating with the first input blind hole 5021. Since the second input hole 5022 is located on the first oil inlet groove 503, it is directly facing the first bearing 800, and it can directly lubricate the first bearing 800 and then flow into the lubrication gap A, and the lubrication effect is better.

[0040] More specifically, a second oil inlet groove 504 communicating with the first input blind hole 5021 is provided on the outer wall of the end cover 500, and the main lubricating oil hole of the crankcase is communicated with the second oil inlet groove 504. The second oil inlet groove 504 extends along the circumference of the end cover 500, and its two side ends along the circumference are respectively located on both sides of the radial direction of the end cover 500. The circumferential distance of the second oil inlet groove 504 is large, which can adapt to the position of the main lubricating oil hole of the crankcase of different crankcases, making the assembly of the end cover 500 easier.

[0041] In order to avoid the problem that the lubricating oil in the lubricating gap A is too much and causes the lubricating oil to leak outward from the mating surface between the seal 600 and the input gear shaft 200, thereby causing the sealing effect to deteriorate, as shown in FIG. Figure 4 , Figure 5 As shown, the end cover 500 is provided with an oil return groove 505 connected to the lubrication gap A on the end face that cooperates with the first bearing 800, and the crankcase 100 is provided with a first oil return hole 101 corresponding to the oil return groove 505. The lubricating oil between the end cover 500 and the input gear shaft flows back to the crankcase 100 through the oil return groove 505 and the first oil return hole 101.

[0042] The oil return groove 505 is spaced at least 1 / 4 of the circumference from the first input blind hole 5021 to ensure that the lubricating oil flows out through the oil return groove 505 after the lubrication gap is filled, so as to meet the lubrication effect of the first bearing 800. In addition, the circumferential extension distance of the oil return groove 505 is less than 1 / 10 of the circumference. The circumferential distance of the oil return groove 505 is small, so that there will not be too much lubricating oil wasted from the return groove.

[0043] The present invention also discloses a specific embodiment of an emulsion pump, which is mainly different from the existing emulsion pump in that the emulsion pump includes the power end. The structure of the power end refers to the specific embodiment of the power end of the emulsion pump, which will not be described here.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A power end of an emulsion pump, comprising: A crankcase, and at least one gear pair and a crank slider mechanism located in the crankcase; The input gear shaft of the gear pair is used to connect with the output shaft of the main drive motor; the crankshaft of the crank slider mechanism is connected with the output gear of the gear pair, and the slider of the crank slider mechanism is slidably connected to the crankcase; the characteristics are: An end cover is arranged between the input gear shaft and the crankcase, at least one seal and at least one transposition ring are arranged between the end cover and the input gear shaft, the outer wall of the transposition ring is in clearance with the end cover, and the inner wall of the transposition ring has a clearance with the input gear shaft; Two transposition rings are arranged between the end cover and the input gear shaft, and the thickness of the two transposition rings is different; a first bearing is sleeved on the input gear shaft, and the end face of the end cover abuts against the first bearing; the end cover and the input gear shaft have a lubrication gap in the axial direction in the area between the seal and the first bearing, and the end cover is provided with a lubrication input hole connected to the main lubrication oil hole of the crankcase, and the lubrication input hole is connected to the lubrication gap; the end cover is provided with a first oil inlet groove connected to the lubrication gap on the end face that cooperates with the first bearing, and the lubrication input hole includes a first input blind hole arranged on the outer wall of the end cover and extending radially, and a second input hole arranged on the first oil inlet groove and connected to the first input blind hole.

2. The power end of an emulsion pump according to claim 1, characterized in that: The inner wall of the end cover is provided with a shoulder, and the sealing member and the transposition ring are installed in the area between the shoulder and the outer end surface of the end cover.

3. The power end of an emulsion pump according to claim 1, characterized in that: The end cover is arranged on a side of the input gear shaft connected to the main drive motor.

4. The power end of an emulsion pump according to claim 1, characterized in that: A second oil inlet groove connected to the first input blind hole is arranged on the outer wall of the end cover, the main lubricating oil hole of the crankcase is connected to the second oil inlet groove, and the second oil inlet groove extends along the circumference of the end cover.

5. The power end of an emulsion pump according to claim 1, characterized in that: The end cover is provided with an oil return groove connected to the lubrication gap on the end face that cooperates with the first bearing, and the crankcase is provided with a first oil return hole corresponding to the oil return groove. The lubricating oil between the end cover and the input gear shaft flows back into the crankcase through the oil return groove and the first oil return hole.

6. An emulsion pump, characterized in that: It comprises the power end of the emulsion pump as described in any one of claims 1-5.

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