Plunger pump connecting rod and connecting device of plunger mechanism

Abstract

A connecting device of a plunger pump connecting rod and a plunger mechanism comprises the connecting rod, limiting padding and a plunger, the connecting rod is provided with a clamping groove, the clamping groove is matched with a plunger head at the top of the plunger, and after the plunger head and the connecting rod are assembled through the clamping groove, the limiting padding is plugged in through a side opening of the connecting rod. According to the device, friction between metal and metal is changed into friction between metal and nonmetal, the service life of a metal piece is prolonged, and loss caused by replacement of metal parts is reduced. And the working efficiency and energy utilization of the plunger pump are improved, so that the plunger pump has higher stability in the aspect of energy transmission.

Description

Technical Field

[0001] This patent relates to the technical field of connection devices, and specifically to a connection device for a plunger pump connecting rod and a plunger mechanism, which is mainly used in a submerged horizontal flow plunger metering pump at the tail end of a nuclear chemical plant. Background Art

[0002] In a nuclear chemical plant, the submerged horizontal flow plunger metering pump is a key equipment at the tail end, which plays a key role in conveying liquid to a bed. However, in actual application, the pump has a high maintenance frequency due to the existing connection between the plunger and the connecting rod, which is prone to disengagement and wear. Although the existing plunger pump and connecting rod structure can meet the feeding needs of a bed to a certain extent, there are still problems in structural design and material selection, which need further improvement and optimization. Therefore, it is particularly important to design a new connection mechanism between the plunger and the connecting rod. Summary of the invention

[0003] The purpose of the present invention is to design a plunger-connecting rod mechanism which is simple in structure, reliable and easy to install and replace, improve the defects of the existing plunger and connecting rod mechanism, and achieve the effect of reducing the maintenance frequency, extending the service life and reducing the maintenance frequency.

[0004] The technical solution of the present invention is as follows: a connecting device for a plunger pump connecting rod and a plunger mechanism, including a connecting rod, a limit filler, and a plunger. The connecting rod is designed with a slot that matches the plunger head at the top of the plunger. After the plunger head and the connecting rod are assembled through the slot, the limit filler is inserted through the side opening of the connecting rod.

[0005] The plunger and connecting rod are made of metal.

[0006] The plunger is made of acid-resistant stainless steel.

[0007] The connecting rod is made of corrosion-resistant stainless steel and has no surface coating.

[0008] The limit filler is made of non-metallic material.

[0009] The limiting filler material is hydrogenated nitrile rubber.

[0010] The limit packing ensures that there is no direct contact between the connecting rod and the plunger.

[0011] The piston is fixed by the limiting filler so that it will not have excessive displacement in the direction of movement.

[0012] The plunger is fixed by the slot so that it cannot rotate along its own axis.

[0013] The remarkable effects of the present invention are:

[0014] (1) This solution changes the friction between metal and metal into friction between metal and non-metal, thereby extending the service life of metal parts and reducing the loss of replacing metal parts.

[0015] (2) This solution can improve the working efficiency and energy utilization of the plunger pump, making it more stable in energy delivery;

[0016] (3) This solution enables the plunger pump to operate continuously and stably, reducing the maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1-1 This is the overall schematic diagram of the structure;

[0018] Figure 1-2 is a schematic cross-sectional view of the structure as a whole;

[0019] Figure 2 Schematic diagram of the plunger structure

[0020] Figure 3-1 Schematic diagram of connecting rod structure

[0021] Figure 3-2 Schematic diagram of connecting rod structure

[0022] Figure 4 is a schematic diagram of the packing;

[0023] Figure 5 The original plunger force diagram

[0024] Figure 6 Installation diagram of plunger-link mechanism

[0025] In the figure: 1 connecting rod, 2 limit filler, 3 plunger, 4 slot, 5 plunger head. DETAILED DESCRIPTION

[0026] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0027] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0028] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0029] A connecting device for a plunger pump connecting rod and a plunger mechanism includes a connecting rod 1, a limiting filler 2, and a plunger 3. The plunger 3 and the connecting rod 1 are made of metal, and the limiting filler 2 is made of non-metallic material. To facilitate the connection between the plunger 3 and the connecting rod 1, the connecting rod 1 is designed with a card slot 4, which matches the plunger head 5 on the top of the plunger 3. The plunger 3 is fixed by the card slot 4 so that it will not rotate along its own axis, and is fixed by the limiting filler 2 so that the plunger 3 will not have excessive displacement in the direction of movement. The overall schematic diagram of the structure is shown in Figure 1.

[0030] Plunger 3, structure as Figure 2 As shown, a plunger head 5 is designed on the upper part, and the plunger head 5 cooperates with the connecting rod slot 4 to prevent the plunger from being disengaged. The entire plunger 3 is designed with acid-resistant stainless steel material.

[0031] The connecting rod 1 has a structure as shown in FIG3 . It is hollow inside and has a half-open slot 4 on the side for easy assembly of the plunger head 5 . A countersunk slot is designed inside, and the size of the slot 4 matches the size of the plunger head 3 to fix the plunger 3 .

[0032] Limiting filler 2, structure as Figure 4 As shown, after the plunger head 5 and the connecting rod 1 are assembled through the slot 4, the limiting filler 2 is inserted through the assembly hole of the plunger head 5 to limit the displacement of the plunger 3 along the moving direction.

[0033] In actual operation, the connecting rod drives the plunger to move up and down, and the existence of the gap will increase the wear of the plunger mushroom head and the connecting rod, resulting in a smaller size of the plunger head. When the connecting rod drives the plunger to move, it is not only subjected to force in the direction of movement, but also has a tendency to move the plunger head in the installation direction due to the compression of the connecting rod at the connection. As the plunger pump runs, under the action of various forces, the plunger head continues to be worn, causing the plunger head to fall out of the installation hole.

[0034] The present invention has 3 parts, and the overall assembly diagram is shown in FIG1 , including: a connecting rod 1, a limiting filler 2, and a plunger 3. Through this connection method, the plunger can be fixed to the connecting rod, and the frequency of the plunger head falling off due to the wear of the plunger coating is reduced to a certain extent. Compared with the original structure, the most severely worn part of the new structure is the limiting filler, and the filler is easy to replace.

[0035] The main structures and functions are as follows:

[0036] Connecting rod 1: In the plunger pump, connecting rod 1 is connected to the crank. When the crank transmits power, the connecting rod drives the plunger to reciprocate as the crank moves up and down. The connecting part of the connecting rod and the plunger 3 is a hollow structure. The internal schematic diagram is shown in Figure 3. Insert the plunger through the opening on the side of the connecting rod. When the lower surface of the plunger head matches the upper surface of the connecting rod slot, pull the plunger downward to embed the plunger head into the slot. At this time, it can be ensured that the plunger has no circumferential displacement. Compared with the original design, the new design prevents the plunger from rotating circumferentially, and the new design prevents the plunger head from directly contacting the connecting rod. The connecting rod 1 is made of corrosion-resistant stainless steel and has no coating on the surface. Because the focus of this design is on a new type of plunger-connecting rod connection, the length of the connecting rod and the diameter of the connecting rod shaft can be adjusted according to actual needs.

[0037] Limiting packing: When the connecting rod and the plunger are assembled and the plunger head is ensured to be embedded in the connecting rod slot, the limiting packing can be inserted through the side opening of the connecting rod. The limiting packing 2 can ensure that there is no direct contact between the connecting rod 1 and the plunger 3. The packing material is HNBR (hydrogenated nitrile rubber), which is resistant to wear and acid and alkali corrosion. Because the focus of this design is on a new type of plunger-connecting rod connection, the size of the limiting packing can be adjusted according to the relevant matching dimensions of the new plunger and connecting rod.

[0038] Plunger: The plunger is designed with a plunger head, a transition section and a plunger barrel. The plunger head serves to connect the connecting rod and is installed in conjunction with the connecting rod slot. The transition section serves to connect the plunger head and the plunger barrel. The plunger barrel is a key component in the pump. The reciprocating motion of the plunger changes the volume of the pump cavity to achieve the delivery of the liquid medium. The plunger is made of corrosion-resistant stainless steel and has no coating on the surface. Since this design focuses on a new type of plunger-connecting rod connection method, the plunger length and plunger shaft diameter can be adjusted according to actual needs.

[0039] The working principle of the present invention is as follows:

[0040] 1. Install the plunger to the plunger seat of the pump body and connect and fix the plunger and plunger seat.

[0041] 2. Connect the plunger and connecting rod through the connection method of this design, and install and fix the limit filler

[0042] 3. Connect the connecting rod to the pump actuator

[0043] In the examples of the present invention, the structural design is reasonable. On the premise of achieving the function, the structure is simple, the principle is simple, the maintenance frequency of the pump is greatly reduced, and the stable operation of the pump is guaranteed.

[0044] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0045] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A connecting device for a plunger pump connecting rod and a plunger mechanism, characterized in that: The invention comprises a connecting rod (1), a limiting filler (2) and a plunger (3); the connecting rod (1) is provided with a slot (4); the slot (4) matches a plunger head (5) at the top of the plunger (3); after the plunger head (5) and the connecting rod (1) are assembled through the slot (4), the limiting filler (2) is inserted through the side opening of the connecting rod (1); The plunger (3) is made of acid-resistant stainless steel; The connecting rod (1) is made of corrosion-resistant stainless steel and has no coating on the surface; The limiting filler (2) is made of hydrogenated nitrile rubber; The stop packing (2) ensures that the connecting rod (1) has no direct contact with the plunger (3).

2. A connection device for a plunger pump connecting rod and a plunger mechanism according to claim 1, characterized in that: The limiting filler (2) is used to fix the plunger (3), so that the plunger (3) will not have excessive displacement in the direction of movement.

3. A connection device for a plunger pump connecting rod and a plunger mechanism according to claim 1, characterized in that: The plunger (3) is fixed by the clamping groove (4) so ​​that it cannot rotate along its own axial direction.

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