Plunger pressing sleeve assembly of reciprocating plunger pump

Abstract

The utility model relates to the technical field of reciprocating plunger pumps, and provides a plunger pressing sleeve assembly of a reciprocating plunger pump, which comprises a pressing sleeve, one end of the inner wall of the pressing sleeve is provided with a limiting part, and one side of the limiting part is sleeved with a spring and a sealing filler which are tightly attached to the inner wall of the pressing sleeve; through the wave spring, the sealing performance is improved, and the abrasion loss of a sealing material is compensated; the structure is simple, the dismounting efficiency is high, and the maintenance cost and time are reduced; the leakage flow direction is changed, and emulsification of crankcase lubricating oil is avoided; the device is made of a high-strength material, and is good in compression resistance and corrosion resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to reciprocating plunger pump technical field provides a reciprocating plunger pump plunger pressure bushing subassembly. BACKGROUND

[0002] The reciprocating plunger pump is a kind of pump that utilizes reciprocating plunger to generate pressure difference in pump cylinder, thereby sucking and discharging fluid. It makes fluid generate continuous or intermittent flow in the process of suction and discharge by the reciprocating movement of plunger in pump cylinder. This pump is usually used in high-pressure and small-flow occasions, and is widely applied in chemical industry, petroleum, water treatment and other fields.

[0003] The reciprocating plunger pump is mainly composed of the following parts: pump body, plunger, cylinder sleeve, suction valve, discharge valve, driving device and sealing element. The pump body is the shell of the whole pump, and the cylinder sleeve is contained in the inside, and the plunger slides in the cylinder sleeve. The plunger reciprocates in the pump body, sucks fluid through the suction valve, and discharges fluid through the discharge valve. The driving device is usually a motor or an internal combustion engine, which connects the plunger through a crankcase and is responsible for providing power to make the plunger reciprocate. The sealing element is used to ensure the sealing of the pump interior, to prevent fluid leakage.

[0004] The plunger pressure bushing is one of its sealing elements, usually made of high-strength metal material, and its main function is to provide a sealed environment to prevent hydraulic oil leakage and ensure the normal operation of the hydraulic system. It is usually installed at the connection between the driving device and the plunger, and is sleeved on the root of the piston rod. After being installed in the plunger pressure bushing, the packing is wound and installed, and finally the packing is pressed tightly in the plunger pressure bushing by the pressure cap.

[0005] The traditional plunger pressure bushing is prone to looseness of the pressure cap or fatigue and wear of the packing during use, which leads to an increase in tightness and leakage, and further reduces the sealing performance, affecting the working efficiency of the pump. It can also cause water to enter the crankcase, emulsify the lubricating oil, cause cylinder pulling, bearing failure and bearing bush burning, etc. seriously affecting the service life of the equipment. In addition, the replacement cycle of the pressure bushing is short, which increases the maintenance cost and time. SUMMARY

[0006] The utility model aims at the shortage of prior art, and provides a reciprocating plunger pump plunger pressure bushing subassembly to solve the following technical problems:

[0007] The sealing performance of the traditional plunger pressure bushing is insufficient, easy to wear and leak, and the replacement cycle is short, which can easily cause the emulsification of the lubricating oil in the crankcase.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] A reciprocating plunger pump plunger pressure bushing subassembly, comprising a pressure bushing, a limit part is arranged on one end of the inner wall of the pressure bushing, and a spring and a sealing packing are sleeved on one side of the limit part and tightly contact with the inner wall of the pressure bushing.

[0010] Further, the compression sleeve is internally provided with a stepped shaft hole, the stepped shaft hole comprises a large hole and a small hole, the limiting part is a second shoulder between the large hole and the small hole, and a ring groove is formed in an end face of the second shoulder; and the spring and the sealing packing are arranged in the large hole.

[0011] Further, the ring groove is formed in the end face of the second shoulder, and one end of the spring is embedded in the ring groove.

[0012] Further, the compression sleeve further comprises a guide compression ring, the guide compression ring is tightly sleeved in the large hole and abuts against the inner wall of the large hole, and the guide compression ring abuts against the outer side of the sealing packing.

[0013] Further, the end of the compression sleeve is provided with a liquid discharge hole, the outer wall of the guide compression ring is provided with a liquid discharge groove corresponding to the position of the liquid discharge hole, and the liquid discharge groove is in communication with the liquid discharge hole.

[0014] Further, the compression sleeve further comprises a spring seat, the spring seat is annular, is tightly sleeved in the large hole and abuts against the inner wall of the large hole, and the spring seat is between the spring and the sealing packing.

[0015] Further, the outer wall of the spring seat is provided with a third shoulder, the upper end of the spring seat is sleeved with the spring, and the spring is between the second shoulder and the third shoulder.

[0016] Further, the end face of the third shoulder is provided as a circular arc bottom.

[0017] Further, the compression sleeve is in the form of a shoulder shaft sleeve.

[0018] Further, the spring is a wave spring or a compression spring, and the sealing packing is a packing.

[0019] The compression sleeve has the following beneficial effects:

[0020] The wave spring improves the sealing performance and compensates for the wear loss of the sealing material, the structure is simple, the disassembly and assembly efficiency is high, the maintenance cost and time are reduced, the liquid leakage flow direction is changed, and the emulsification of the crankcase lubricating oil is avoided, the high-strength material is used for manufacturing, and the compression resistance and corrosion resistance are good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a front view structural schematic diagram of the compression sleeve assembly;

[0022] Figure 2 is Figure 1 is a sectional view structural schematic diagram of A-A in the compression sleeve;

[0023] Figure 3 is a three-dimensional structural schematic diagram of the compression sleeve;

[0024] Figure 4 is a front view structural schematic diagram of the compression sleeve;

[0025] Figure 5 is Figure 4 is a sectional view of the structure at C-C in the middle;

[0026] Figure 6 is a perspective view of the structure of the spring seat;

[0027] Figure 7 is a front view of the structure of the spring seat;

[0028] Figure 8 is Figure 7 is a sectional view of the structure at B-B in the middle;

[0029] Figure 9 is a perspective view of the structure of the wave spring;

[0030] Figure 10 is a perspective view of the structure of the guide pressure ring;

[0031] Figure 11 is a structure diagram of Example 2;

[0032] Figure 12 is a structure diagram of Example 3;

[0033] In the drawings:

[0034] 1, the sleeve, 2, the guide pressure ring, 3, the spring seat, 4, the packing, 5, the wave spring, 101, the ring groove, 102, the liquid discharge hole, 103, the first shoulder, 104, the second shoulder, 201, the liquid discharge groove, 301, the third shoulder. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0036] Example 1

[0037] As Figures 1-2 shown, a reciprocating plunger pump plunger sleeve 1 assembly is mainly composed of a sleeve 1, a wave spring 5, a spring seat 3, a packing 4 and a guide pressure ring 2.

[0038] As Figures 3-5As shown in the figure, the pressing sleeve 1 is in the form of a shoulder sleeve, the outer edge of the upper end is provided with a first shoulder 103 for positioning during installation, and a plurality of rows of liquid discharge holes 102 are arranged in an array around the lower end, the liquid discharge holes 102 are through holes, and when a small amount of liquid leaks from the plunger pump, the leaked liquid can be discharged in time to prevent the leaked liquid from entering the crankcase; the inside of the pressing sleeve 1 is a stepped shaft hole, the stepped shaft hole is processed into two sections of small holes and large holes, wherein the small holes are located at the upper part and have the same height as or close to the height of the first shoulder 103, and the large holes are located at the lower part and are used for installing the packing 4, the wave spring 5, the spring seat 3 and the guide pressing ring 2; the second shoulder 104 is arranged between the small holes and the large holes; the end face of the second shoulder 104 is processed with a ring groove 101 for installing the wave spring 5.

[0039] As shown in the figure, Figures 6-8 the spring seat 3 is also in the form of a shoulder sleeve, the annular space between the outer wall of the upper end and the large hole is used for installing the wave spring 5, the outer wall of the lower end is in clearance fit with the large hole, the outer edge of the lower end is provided with a third shoulder 301, and the inner diameter of the spring seat 3 is the same as that of the small hole.

[0040] As shown in the figure, Figures 9-10 the wave spring 5 is a wave-shaped spring and can surround the ring, the height of the wave spring 5 is at least higher than the depth of the ring groove 101, and the actual height can be selected according to the pressure of the plunger pump and the like, and the wave spring 5 is used for providing elastic force to push the spring seat 3; the guide pressing ring 2 is in the form of a ring, the inner diameter is consistent with that of the small hole, the outer wall is in clearance fit with the large hole, and a plurality of grooves corresponding to the positions of the liquid discharge holes 102 are arranged on the outer periphery, the grooves and the inner wall of the large hole form a liquid discharge groove 201 as a flow channel for the leaked liquid.

[0041] The wave spring 5, the spring seat 3 and the guide pressing ring 2 are all sleeved on the inner wall of the large hole, wherein the wave spring 5 is located in the annular space and is interposed between the second shoulder 104 and the third shoulder 301, and the upper edge of the wave spring 5 is embedded in the ring groove 101; the packing 4 is arranged around the large hole in tight fit between the lower end face of the spring seat 3 and the upper end face of the guide pressing ring 2.

[0042] In the utility model, the end face of the third shoulder 301 can be processed into a circular arc bottom, and the lower edge of the wave spring 5 is embedded in the circular arc bottom, so that the wave spring 5 is more stable.

[0043] In the utility model, the pressing sleeve 1, the spring seat 3 and the guide pressing ring 2 are preferably made of 17-4PH stainless steel, which has good pressure resistance and corrosion resistance; the wave spring 5 can also be selected from large-diameter compression springs.

[0044] The installation of the utility model is as follows:

[0045] Firstly, the wave spring 5, the spring seat 3, the packing 4 and the guide pressing ring 2 are sequentially sleeved in the stepped shaft hole of the pressing sleeve 1 to form a pressing sleeve 1 assembly, then the upper end of the pressing sleeve 1 assembly is downward, the pressing sleeve 1 assembly is sleeved into the root part of the piston rod and the plunger, and finally the pressing cap is tightened, the lower end face of the pressing cap is pressed against the end face of the guide pressing ring 2, and the installation is completed.

[0046] The principle of the utility model is:

[0047] The guide compression ring 2 is fixed by the compression cap, the wave spring 5 pushes the spring seat 3 to exert pressure on the packing 4 between the spring seat 3 and the guide compression ring 2, the packing 4 is deformed and extruded under the pressure, and is more closely attached to the piston rod, so that the sealing performance is improved; when the packing 4 is worn, the packing 4 is further extruded under the elastic force of the wave spring 5, and is attached to the piston rod, so that the wear compensation of the packing 4 is realized.

[0048] In the utility model, the packing 4 can also be other sealing fillers, sealing rings or other sealing materials suitable for the plunger pump.

[0049] Embodiment 2

[0050] As Figure 11 A reciprocating plunger pump plunger pressure sleeve 1 assembly mainly comprises a pressure sleeve 1, a wave spring 5, a packing 4 and a guide compression ring 2, and the wave spring 5, the packing 4 and the guide compression ring 2 are sequentially sleeved in the pressure sleeve 1.

[0051] The wave spring 5 of the embodiment has stability difference, can scratch the outer wall of the piston rod or fall off in the running process, but still has the effects of improving the sealing performance, wear compensation and preventing the emulsification of the crankcase lubricating oil.

[0052] Embodiment 3

[0053] As Figure 12 A reciprocating plunger pump plunger pressure sleeve 1 assembly mainly comprises a pressure sleeve 1, a wave spring 5 and a packing 4, and the wave spring 5 and the packing 4 are sequentially sleeved in the pressure sleeve 1.

[0054] The embodiment has the effects of improving the sealing performance and wear compensation.

[0055] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all should be covered in the protection scope of the utility model.

Claims

1. A reciprocating plunger pump plunger press sleeve (1) assembly comprising a press sleeve (1), characterized in that, The limit part is provided with a spring and a sealing packing which are close to the inner wall of the pressing sleeve (1); The pressing sleeve (1) is internally provided with a stepped shaft hole, the stepped shaft hole comprises a large hole and a small hole, the limit part is a second shoulder (104) between the large hole and the small hole, an annular groove (101) is formed on the end face of the second shoulder (104); the spring and the sealing packing are arranged in the large hole; the annular groove (101) is formed on the end face of the second shoulder (104), and one end of the spring is embedded in the annular groove (101); the guiding pressing ring (2) is arranged in the large hole and close to the inner wall of the large hole, and the guiding pressing ring (2) abuts against the outer side of the sealing packing.

2. A reciprocating plunger pump plunger press sleeve (1) assembly according to claim 1, characterized in that, The end of the pressing sleeve (1) is provided with a drainage hole (102), the outer wall of the guiding pressing ring (2) is provided with a drainage groove (201) corresponding to the position of the drainage hole (102), and the drainage groove (201) is in communication with the drainage hole (102).

3. A reciprocating plunger pump plunger press sleeve (1) assembly according to claim 2, characterized in that, The spring seat (3) is annular, is arranged in the large hole and close to the inner wall of the large hole, and is between the spring and the sealing packing.

4. A reciprocating plunger pump plunger press sleeve (1) assembly according to claim 3, characterized in that, The outer wall of the spring seat (3) is provided with a third shoulder (301), the upper end of the spring seat (3) is sleeved with the spring, and the spring is between the second shoulder (104) and the third shoulder (301).

5. A reciprocating plunger pump plunger press sleeve (1) assembly according to claim 4, characterized in that The end face of the third shoulder (301) is provided with a circular arc bottom.

6. A reciprocating plunger pump plunger pressure bushing (1) assembly according to any one of claims 1-5, characterized in that, The pressing sleeve (1) is in the form of a shoulder shaft sleeve.

7. A reciprocating plunger pump plunger pressure bushing (1) assembly according to any one of claims 1-5, characterized in that, The spring is a wave spring or a compression spring, and the sealing packing is a packing (4).

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