A piston rod and plunger rod connecting structure for a liquid-driven plunger pump

Abstract

The utility model relates to a piston rod and plunger rod connecting structure for liquid drive plunger pump, the piston rod and plunger rod connecting structure for liquid drive plunger pump, including the connecting sleeve, the one end of connecting sleeve forms to have the first installation mouth that supplies the end part of piston rod to stretch in, the end part of piston rod is equipped with the first connecting hole radially, be equipped with the second connecting hole with first connecting hole through on connecting sleeve, and the spring pin is inserted in first connecting hole and second connecting hole, the connecting sleeve outside connection has the limiting piece that limits spring pin to come out, the other end of connecting sleeve forms to have the second installation mouth that supplies the end part of plunger rod to stretch in, and the limit thread sleeve that is connected with the thread of connecting sleeve is equipped with on the plunger rod upper rod head rear side, to limit the rod head of plunger rod in second installation mouth, and the end part of plunger rod is equipped with clearance adjusting pad piece between second installation mouth.

Description

Technical Field

[0001] This utility model relates to the field of liquid-driven plunger pumps, and in particular to a piston rod and plunger rod connection structure for a liquid-driven plunger pump. Background Technology

[0002] A hydraulically driven plunger pump is a type of reciprocating plunger pump that pressurizes a liquid medium by performing work on it through the reciprocating motion of the plunger. Ultra-high pressure discharge requires a reliable structure for the piston rod and plunger rod connection to withstand high plunger forces and achieve a stable and reliable connection. However, existing connection structures use flange connections, which are not only structurally complex but also inconvenient to adjust. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a piston rod and plunger rod connection structure for a liquid-driven plunger pump, which has the advantages of simple structure, floating connection, adjustable clearance and convenient adjustment.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A piston rod and plunger rod connection structure for a hydraulically driven plunger pump includes a connecting sleeve. One end of the connecting sleeve has a first mounting port for the piston rod end to extend into. The piston rod end has a first connecting hole radially provided. The connecting sleeve has a second connecting hole communicating with the first connecting hole. A spring pin is inserted into the first and second connecting holes. A limiting member is connected to the outside of the connecting sleeve to prevent the spring pin from disengaging. The other end of the connecting sleeve has a second mounting port for the plunger rod end to extend into. A limiting threaded sleeve that is threadedly connected to the connecting sleeve is fitted on the plunger rod behind the rod head to limit the rod head of the plunger rod in the second mounting port. A gap adjustment pad is provided between the end of the plunger rod and the second mounting port.

[0006] Preferably, the limiting threaded sleeve is locked by a first nut fixed to the end of the connecting sleeve.

[0007] Preferably, the limiting member is a trigger ring that is threadedly connected to the connecting sleeve, and the outer ring of the trigger ring has an outwardly protruding feedback portion.

[0008] Preferably, a second nut is threadedly connected to the side of the trigger ring near the plunger rod, and the outer diameter of the rod segment of the piston rod that abuts against the end of the connecting sleeve is larger than the outer diameter of the connecting sleeve, so that the trigger ring can be locked between it and the piston rod by the second nut.

[0009] The advantages of this utility model, employing the above-mentioned technical solution, are as follows: The piston rod and plunger rod connection structure of this hydraulically driven plunger pump, through a connecting sleeve, spring pin, and limiting component, are connected to the piston rod, enabling the piston rod to float relative to the connecting sleeve. Furthermore, through the connection sleeve, external threaded sleeve, internal threaded sleeve, and clearance adjusting pad, the axial clearance of the plunger rod relative to the connecting sleeve can be controlled, and adjustment is relatively convenient. These structures make the fit between the plunger rod and piston rod more flexible and less prone to jamming. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of one embodiment of the present invention.

[0011] In the figure, 1 is the connecting sleeve, 2 is the piston rod, 3 is the first connecting hole, 4 is the second connecting hole, 5 is the spring pin, 6 is the limiting component, 7 is the plunger rod, 8 is the limiting threaded sleeve, 9 is the gap adjusting pad, 10 is the first nut, 11 is the feedback part, and 12 is the second nut. Detailed Implementation

[0012] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0013] like Figure 1 As shown in this embodiment, the piston rod and plunger rod connection structure of the liquid-driven plunger pump includes a connecting sleeve 1. One end of the connecting sleeve 1 forms a first mounting port for the end of the piston rod 2 to extend into. The end of the piston rod 2 is radially provided with a first connecting hole 3. The connecting sleeve 1 is provided with a second connecting hole 4 that communicates with the first connecting hole 3. A spring pin 5 is inserted into the first connecting hole 3 and the second connecting hole 4. A limiting member 6 that restricts the spring pin 5 from dislodging is connected to the outside of the connecting sleeve 1. The other end of the connecting sleeve 1 forms a second mounting port for the end of the plunger rod 7 to extend into. A limiting threaded sleeve 8 that is threadedly connected to the connecting sleeve 1 is fitted on the rear side of the plunger rod 7 to limit the plunger rod 7 in the second mounting port. A gap adjustment pad 9 is provided between the end of the plunger rod 7 and the second mounting port.

[0014] In one specific embodiment, the limiting threaded sleeve 8 is locked by a first nut 10 fixed to the end of the connecting sleeve 1.

[0015] In one specific embodiment, the limiting member 6 is a trigger ring that is threadedly connected to the connecting sleeve, and the outer ring of the trigger ring has an outwardly protruding feedback portion 11.

[0016] In one specific embodiment, a second nut 12 is threadedly connected to the side of the trigger ring near the plunger rod 7. The outer diameter of the rod segment of the piston rod 7 that abuts against the end of the connecting sleeve is larger than the outer diameter of the connecting sleeve 1, so that the trigger ring can be locked between it and the piston rod 7 by the second nut 12, which can prevent the trigger ring from loosening or misaligning and ensure the accuracy of feedback.

[0017] Working principle: The connection structure of this application connects the hydraulically driven piston rod through a spring pin, which is used to match the hydraulically driven plunger pump with a single-acting pump head. That is, during the compression stroke, the connecting sleeve transmits the plunger force to the piston rod, and during the suction stroke, the spring pin pulls the connecting sleeve and the plunger rod to the right. The spring pin realizes the floating connection between the piston rod and the connecting sleeve.

[0018] The connection structure of this application uses a limiting threaded sleeve to engage with a connecting sleeve to confine the plunger rod in the second mounting port, limiting its axial displacement. The axial clearance of the plunger rod is controlled by machining the thickness of the shim. The specific control method is as follows: the limiting threaded sleeve is tightened based on the designed torque to ensure that the plunger rod is close to the shim. At this time, a mark is made on the external thread of the limiting threaded sleeve. Then, the limiting threaded sleeve and the plunger rod are removed, and the clearance adjustment shim is taken out. The thickness of the shim is machined to reduce the clearance value according to the design requirements. Finally, the limiting threaded sleeve and the plunger rod are reinstalled according to the marked position on the external thread. The gap left between the plunger rod and the clearance adjustment shim is the clearance control distance, which is also the thickness reduction.

[0019] In the connection structure of this application, a trigger ring is installed on the outside of the connecting sleeve close to the piston rod by means of the external thread of the connecting sleeve, so as to facilitate the feedback of the position information of the reciprocating motion of the piston rod and plunger rod by a triggering device (which can be a displacement sensor) that is close to or in contact with the triggering device.

[0020] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0021] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A piston rod and plunger rod connection structure for a liquid-driven plunger pump, characterized in that, The device includes a connecting sleeve. One end of the connecting sleeve has a first mounting port for the piston rod end to extend into. The piston rod end has a first connecting hole radially provided. The connecting sleeve has a second connecting hole communicating with the first connecting hole. A spring pin is inserted into the first and second connecting holes. A limiting member is connected to the outside of the connecting sleeve to prevent the spring pin from dislodging. The other end of the connecting sleeve has a second mounting port for the plunger rod end to extend into. A limiting threaded sleeve that is threadedly connected to the connecting sleeve is fitted on the plunger rod behind the rod head to limit the rod head of the plunger rod in the second mounting port. A gap adjustment pad is provided between the end of the plunger rod and the second mounting port.

2. The piston rod and plunger rod connection structure for a hydraulically driven plunger pump according to claim 1, characterized in that, The limiting threaded sleeve is locked by a first nut fixed to the end of the connecting sleeve.

3. The piston rod and plunger rod connection structure for a hydraulically driven plunger pump according to claim 1, characterized in that, The limiting component adopts a trigger ring that is threadedly connected to the connecting sleeve, and the outer ring of the trigger ring has an outwardly protruding feedback part.

4. The piston rod and plunger rod connection structure for a hydraulically driven plunger pump according to claim 3, characterized in that, The trigger ring is also threaded with a second nut on the side near the plunger rod. The outer diameter of the rod section of the piston rod that abuts against the end of the connecting sleeve is larger than the outer diameter of the connecting sleeve, so that the trigger ring can be locked between it and the piston rod by the second nut.

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