Sealing mechanism of high-pressure plunger pump

Abstract

The utility model discloses a high-pressure plunger pump sealing mechanism which comprises a pump body, a pump head, a plunger rod and a sealing assembly. The plunger rod is sleeved with the sealing device. The sealing device comprises a mounting cylinder, a first sealing ring, a second sealing ring and a fixed cylinder; a sealing groove is formed in the first sealing ring, and a first sealing ring is arranged in the sealing groove; one end of the fixing cylinder is connected with the mounting cylinder, a mounting groove is formed in the other end of the fixing cylinder, the second sealing ring is arranged in the mounting groove, and a second sealing ring is arranged in the middle of the second sealing ring. According to the sealing device, potential leakage caused by movement of the plunger rod can be effectively reduced through the double-sealing design of the first sealing ring and the second sealing ring, so that the sealing effect of the pump is improved, the sealing device is convenient to mount and replace through detachable connection of the mounting cylinder, the first sealing ring, the second sealing ring and the fixing cylinder, and the sealing effect is improved. And the maintainability of the equipment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of plunger pump sealing technology, specifically a high-pressure plunger pump sealing mechanism. Background Technology

[0002] Plunger pumps are widely used in various industries, especially suitable for conveying high-viscosity fluids. Due to their ability to withstand highly corrosive, toxic, and highly viscous media during transport, the importance of plunger pumps in industrial production is increasingly prominent. In actual operation, the pump cylinder of a plunger pump faces enormous pressure, and its internal working environment is often quite harsh. Therefore, good sealing performance is crucial to ensuring the normal operation of the pump cylinder.

[0003] Seals not only prevent media leakage and protect equipment and operators, but also effectively improve pump efficiency and service life. To cope with harsh operating conditions, the sealing materials and structural design of plunger pumps need to possess excellent corrosion resistance, wear resistance, and high-pressure resistance. A well-designed seal can reduce maintenance costs, lower failure rates, and thus improve overall operating efficiency.

[0004] In the prior art, for example, the technical solution described in patent publication number CN220909970U is: a plunger pump sealing device and its plunger pump, including a drive unit, a pump head, and a fixed frame. The fixed frame is movably mounted on the pump head and is fitted with a rubber ring; the pump barrel is fixed to the drive unit and cooperates with the fixed frame; the pressure plug is fitted to the drive unit and has a sealing element, which cooperates with the rubber ring.

[0005] In existing technologies, plunger pumps require reciprocating motion to achieve pressurization. Traditional plunger pumps typically only have a sealing ring on the outside of the plunger rod. Once this sealing ring wears down, it cannot effectively guarantee a tight seal, potentially leading to liquid leakage and affecting the pressurization effect, severely impacting the performance of the plunger pump. Furthermore, the sealing structure is a vulnerable component with a limited lifespan, often requiring replacement. Existing pump bodies are usually of a single, integral structure, which causes numerous inconveniences during use. Utility Model Content

[0006] The purpose of this utility model is to provide a high-pressure plunger pump sealing mechanism to solve the problem mentioned in the background art that the existing technology uses a sealing ring to seal the plunger pump, which cannot effectively guarantee the sealing performance, may lead to liquid leakage, and affect the pressurization effect.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A high-pressure plunger pump sealing mechanism includes a pump body, a pump head, a plunger rod, and a sealing assembly; wherein one end of the plunger rod is slidably disposed inside the pump head, and the other end of the plunger rod is connected to the pump body; a sealing device is sleeved on the outside of the plunger rod for sealing the plunger rod;

[0009] The sealing device includes an mounting cylinder, a first sealing ring, a second sealing ring, and a fixed cylinder; wherein, one end of the mounting cylinder is fixedly connected to the pump head, a sealing groove is provided on the first sealing ring, and a first sealing ring is provided inside the sealing groove, the first sealing ring being used for sealing the plunger rod;

[0010] One end of the fixed cylinder is connected to the mounting cylinder, and the other end of the fixed cylinder is provided with a mounting groove. The second sealing ring is located inside the mounting groove, and a second sealing ring is provided in the middle of the second sealing ring. The second sealing ring is used to seal the plunger rod.

[0011] According to the above technical solution, a groove is provided inside the mounting cylinder, and a protrusion that mates with the groove is provided on the first sealing ring. The protrusion of the first sealing ring is inserted into the groove to fix the first sealing ring.

[0012] According to the above technical solution, one end of the mounting cylinder is fixedly connected to the pump head by bolts, and the other end of the mounting cylinder is connected to the fixed cylinder by threads.

[0013] According to the above technical solution, a pressure ring is also provided at the end of the fixed cylinder. The pressure ring is threadedly connected to the fixed cylinder and is used to press the second sealing ring.

[0014] According to the above technical solution, the pump head is also provided with an oil inlet and an oil outlet. An oil inlet check valve is provided inside the oil inlet, and an oil outlet check valve is provided on the oil outlet.

[0015] According to the above technical solution, a drive assembly is provided inside the pump body. The drive assembly is connected to the plunger rod and is used to drive the plunger rod to reciprocate.

[0016] According to the above technical solution, the drive assembly includes a rotating shaft, an eccentric wheel, a collar, and a connecting rod; wherein, the eccentric wheel is disposed on the rotating shaft, the collar is sleeved on the outside of the eccentric wheel, and the end of the collar is connected to the connecting rod, which is used to connect to the plunger rod.

[0017] According to the above technical solution, a fixing component is provided on the connecting rod, and the connecting rod is connected to the plunger rod through the fixing component.

[0018] According to the above technical solution, the fixing component includes a fixing ring and a mounting part; wherein, a fixing groove is provided at the end of the connecting rod, the end of the plunger rod is located inside the fixing groove, a limiting groove is provided at the end of the plunger rod, and the fixing ring is located inside the limiting groove for limiting the plunger rod; the mounting part is sleeved on the outside of the plunger rod and is fixedly connected to the connecting rod.

[0019] According to the above technical solution, the inner wall of the mounting part abuts against one side of the fixing ring, and the other side of the fixing ring abuts against the inner wall of the fixing groove, which is used to fix the plunger rod.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this invention, the dual sealing design of the first sealing ring and the second sealing ring can effectively reduce potential leakage caused by the movement of the plunger rod, thereby improving the sealing effect of the pump and enabling the plunger pump to adapt to high pressure and high temperature conditions in different working environments, ensuring stable operation for a long time.

[0022] The sealing device in this invention features a detachable connection between the mounting cylinder, the first sealing ring, the second sealing ring, and the fixing cylinder, resulting in a compact overall structure that saves space, facilitates the installation and replacement of the sealing device, and improves the maintainability of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the sealing device structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the fixing component structure of this utility model.

[0026] The markings in the diagram are: 100-pump body, 200-pump head, 300-plunger rod, 400-mounting cylinder, 500-first sealing ring, 600-second sealing ring, 700-fixed cylinder, 800-mounting groove, 900-groove, 110-protrusion, 111-pressure ring, 112-oil inlet, 113-oil outlet, 114-rotating shaft, 115-eccentric wheel, 116-collar ring, 117-connecting rod, 118-fixed ring, 119-mounting part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1

[0029] like Figure 1 As shown, a high-pressure plunger pump sealing mechanism includes a pump body 100, a pump head 200, a plunger rod 300, and a sealing assembly; wherein, one end of the plunger rod 300 is slidably disposed inside the pump head 200, and the other end of the plunger rod 300 is connected to the pump body 100; a sealing device is sleeved on the outside of the plunger rod 300 for sealing the plunger rod 300;

[0030] like Figure 2 As shown, the sealing device includes an installation cylinder 400, a first sealing ring 500, a second sealing ring 600, and a fixed cylinder 700; wherein, one end of the installation cylinder 400 is detachably connected to the pump head 200, a sealing groove is provided on the first sealing ring 500, and a first sealing ring is provided inside the sealing groove, the first sealing ring being used for sealing the plunger rod 300.

[0031] One end of the fixed cylinder 700 is connected to the mounting cylinder 400, and the other end of the fixed cylinder 700 is provided with a mounting groove 800. The second sealing ring 600 is located inside the mounting groove 800, and a second sealing ring is provided in the middle of the second sealing ring 600. The second sealing ring is used to seal the plunger rod 300.

[0032] In this invention, the dual sealing design of the first sealing ring 500 and the second sealing ring 600 can effectively reduce potential leakage caused by the movement of the plunger rod 300, thereby improving the sealing effect of the pump and enabling the plunger pump to adapt to high pressure and high temperature conditions in different working environments, ensuring stable operation for a long time.

[0033] The sealing device in this utility model is detachably connected by the mounting cylinder 400, the first sealing ring 500, the second sealing ring 600 and the fixing cylinder 700, which makes the overall structure compact, saves space, facilitates the installation and replacement of the sealing device, and improves the maintainability of the equipment.

[0034] Example 2

[0035] This embodiment is a further refinement of Embodiment 1.

[0036] A groove 900 is provided inside the mounting cylinder 400, and a protrusion 110 that mates with the groove 900 is provided on the first sealing ring 500. The protrusion 110 of the first sealing ring 500 is inserted into the groove 900 to fix the first sealing ring 500.

[0037] Specifically, by providing a groove 900 inside the mounting cylinder 400 and providing a corresponding protrusion 110 on the first sealing ring 500, the cooperation between the protrusion 110 and the groove 900 serves to fix the first sealing ring 500. Furthermore, the cooperation between the protrusion 110 and the groove 900 also prevents oil from leaking from the gap between the first sealing ring 500 and the mounting cylinder 400.

[0038] One end of the mounting cylinder 400 is fixedly connected to the pump head 200 by bolts, and the other end of the mounting cylinder 400 is connected to the fixed cylinder 700 by threads.

[0039] Specifically, the mounting cylinder 400 is detachably connected to the pump head 200 via bolts, facilitating the assembly and disassembly of the mounting cylinder 400 and the pump head 200, and making maintenance of the sealing device easier. The mounting cylinder 400 is threadedly connected to the fixing cylinder 700. By installing the fixing cylinder 700, the first sealing ring 500 can be pressed tightly, making the installation of the first sealing ring 500 more secure.

[0040] A pressure ring 111 is also provided at the end of the fixed cylinder 700. The pressure ring 111 is threadedly connected to the fixed cylinder 700 and is used to press the second sealing ring 600.

[0041] Specifically, by providing an installation groove 800 at the end of the fixed cylinder 700 and placing the second sealing ring 600 inside the installation groove 800, the plunger rod 300 is sealed by the second sealing ring 600. This sealing method eliminates the need to disassemble the entire sealing device, facilitating the replacement of the second sealing ring 600 and reducing maintenance workload.

[0042] like Figure 1 As shown, the pump head 200 is also provided with an oil inlet 112 and an oil outlet 113. An oil inlet check valve is provided inside the oil inlet 112, and an oil outlet check valve is provided on the oil outlet 113.

[0043] Specifically, the oil inlet 112 and the oil inlet check valve are located at the lower part of the pump head 200, and the oil outlet 113 and the oil outlet check valve are located at the upper part of the pump head 200.

[0044] A drive assembly is provided inside the pump body 100. The drive assembly is connected to the plunger rod 300 and is used to drive the plunger rod 300 to reciprocate.

[0045] The drive assembly includes a rotating shaft 114, an eccentric wheel 115, a collar 116, and a connecting rod 117; wherein, the eccentric wheel 115 is disposed on the rotating shaft 114, the collar 116 is sleeved on the outside of the eccentric wheel 115, and the end of the collar 116 is connected to the connecting rod 117, which is used to connect to the plunger rod 300.

[0046] Specifically, the eccentric wheel 115 is driven to rotate by the motor (not shown in the figure), and the eccentric wheel 115 drives the collar 116 to move eccentrically. Since the collar 116 and the connecting rod 117 are hinged, when the collar 116 moves, it will drive the connecting rod 117 to move back and forth, and the connecting rod 117 will then drive the plunger rod 300 to move back and forth.

[0047] A fixing component is provided on the connecting rod 117, and the connecting rod 117 is connected to the plunger rod 300 through the fixing component.

[0048] like Figure 3 As shown, the fixing assembly includes a fixing ring 118 and a mounting part 119; wherein, a fixing groove is provided at the end of the connecting rod 117, the end of the plunger rod 300 is provided inside the fixing groove, a limiting groove is provided at the end of the plunger rod 300, and the fixing ring 118 is provided inside the limiting groove for limiting the plunger rod 300; the mounting part 119 is sleeved on the outside of the plunger rod 300 and is fixedly connected to the connecting rod 117.

[0049] The inner wall of the mounting part 119 abuts against one side of the retaining ring 118, and the other side of the retaining ring 118 abuts against the inner wall of the retaining groove, for fixing the plunger rod 300.

[0050] Specifically, a limiting groove is provided at the end of the plunger rod 300, and a retaining ring 118 is placed inside the limiting groove, so that the retaining ring 118 is fixedly connected to the plunger rod 300; then the end of the plunger rod 300 and the retaining ring 118 are installed into the inside of the retaining groove, and fixedly connected to the connecting rod 117 through the mounting part 119, thereby fixing the plunger rod 300 and the connecting rod 117.

[0051] The working principle of this utility model is as follows: In use, the mounting cylinder 400 is first fixedly connected to the pump head 200 by bolts; then the plunger rod 300 is connected to the drive assembly, and fixedly connected to the mounting cylinder 400 by the fixing cylinder 700 to complete the installation of the plunger rod 300.

[0052] When the plunger rod 300 is running, the first sealing ring, located inside the first sealing ring 500, seals the plunger rod 300 to prevent oil leakage. Since the fixed cylinder 700 seals the rear end of the plunger rod 300, even if oil leaks into the fixed cylinder 700, the second sealing ring 600 at the end of the fixed cylinder 700 further improves the sealing effect, preventing insufficient plunger pump pressure caused by oil leakage.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-pressure plunger pump sealing mechanism, characterized in that: The pump includes a pump body (100), a pump head (200), a plunger rod (300), and a sealing assembly; wherein, one end of the plunger rod (300) is slidably disposed inside the pump head (200), and the other end of the plunger rod (300) is connected to the pump body (100); the sealing device is sleeved on the outside of the plunger rod (300) for sealing the plunger rod (300); The sealing device includes an mounting cylinder (400), a first sealing ring (500), a second sealing ring (600), and a fixed cylinder (700); wherein, one end of the mounting cylinder (400) is detachably connected to the pump head (200), and the first sealing ring (500) is disposed inside the mounting cylinder (400); a sealing groove is provided on the first sealing ring (500), and a first sealing ring is disposed inside the sealing groove, the first sealing ring being used for sealing the plunger rod (300); One end of the fixed cylinder (700) is connected to the mounting cylinder (400), and the other end of the fixed cylinder (700) is provided with a mounting groove (800). The second sealing ring (600) is located inside the mounting groove (800), and a second sealing ring is provided in the middle of the second sealing ring (600). The second sealing ring is used to seal the plunger rod (300).

2. The high-pressure plunger pump sealing mechanism according to claim 1, characterized in that: A groove (900) is provided inside the mounting cylinder (400), and a protrusion (110) is provided on the first sealing ring (500) to cooperate with the groove (900). The protrusion (110) of the first sealing ring (500) is inserted into the groove (900) to fix the first sealing ring (500).

3. The high-pressure plunger pump sealing mechanism according to claim 2, characterized in that: One end of the mounting cylinder (400) is fixedly connected to the pump head (200) by bolts, and the other end of the mounting cylinder (400) is connected to the fixed cylinder (700) by threads.

4. The high-pressure plunger pump sealing mechanism according to claim 3, characterized in that: A pressure ring (111) is also provided at the end of the fixed cylinder (700). The pressure ring (111) is threadedly connected to the fixed cylinder (700) and is used to press the second sealing ring (600).

5. A high-pressure plunger pump sealing mechanism according to claim 4, characterized in that: The pump head (200) is also provided with an oil inlet (112) and an oil outlet (113). An oil inlet check valve is provided inside the oil inlet (112), and an oil outlet check valve is provided on the oil outlet (113).

6. A high-pressure plunger pump sealing mechanism according to claim 5, characterized in that: A drive assembly is provided inside the pump body (100), which is connected to the plunger rod (300) and is used to drive the plunger rod (300) to reciprocate.

7. A high-pressure plunger pump sealing mechanism according to claim 6, characterized in that: The drive assembly includes a rotating shaft (114), an eccentric wheel (115), a collar (116), and a connecting rod (117); wherein, the eccentric wheel (115) is disposed on the rotating shaft (114), the collar (116) is sleeved on the outside of the eccentric wheel (115), and the end of the collar (116) is connected to the connecting rod (117), the connecting rod (117) being used to connect to the plunger rod (300).

8. A high-pressure plunger pump sealing mechanism according to claim 7, characterized in that: A fixing component is provided on the connecting rod (117), and the connecting rod (117) is connected to the plunger rod (300) through the fixing component.

9. A high-pressure plunger pump sealing mechanism according to claim 8, characterized in that: The fixing assembly includes a fixing ring (118) and a mounting part (119); wherein, a fixing groove is provided at the end of the connecting rod (117), the end of the plunger rod (300) is provided inside the fixing groove, a limiting groove is provided at the end of the plunger rod (300), and the fixing ring (118) is provided inside the limiting groove for limiting the plunger rod (300); the mounting part (119) is sleeved on the outside of the plunger rod (300) and fixedly connected to the connecting rod (117).

10. A high-pressure plunger pump sealing mechanism according to claim 9, characterized in that: The inner wall of the mounting part (119) abuts against one side of the retaining ring (118), and the other side of the retaining ring (118) abuts against the inner wall of the retaining groove, for fixing the plunger rod (300).

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