Double-seal cloth-clamping type plunger pump

Abstract

According to the double-seal cloth-clamped plunger pump, the pump body of a double-layer sealing structure, the stable upper pump body frame, the stable lower pump body frame, the combined sealing layer, the plunger sealing water ring, the Y-shaped cloth-clamped seal and entering high-pressure liquid form double-layer sealing; the two vertical hook head vertical plates and the two transverse oil cylinder fixing plates are connected into a square frame through the bolts and the hook head pressing plates, a stable upper pump body frame and a stable lower pump body frame are formed, the advantages of being stable in structure, flexible in conception, capable of saving materials and the like are achieved, the maintenance cost is reduced, the working environment is optimized, and the production efficiency of enterprises is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of plunger pumps, and relates to an improvement in the ceramic plunger seal and assembly structure of a cloth-reinforced plunger pump. Background Technology

[0002] A plunger pump is an important power source. It relies on the reciprocating motion of a plunger within a cylinder to change the volume of the sealed working chamber, thereby achieving oil suction and pressure. Plunger pumps have advantages such as compact structure, high efficiency, and convenient flow rate adjustment.

[0003] Piston pumps are widely used in applications requiring high pressure, high flow, and flow regulation. They are a typical positive displacement hydraulic machine driven by a prime mover, converting input mechanical energy into liquid pressure energy, which is then input into the system in the form of pressure and flow. They are the power source for hydraulic systems. Because they can transport liquids under high pressure, they are widely used in various industries in industrial production and daily life.

[0004] The existing plunger pump has a vertical structure, with a ceramic plunger connected to the piston rod of an external hydraulic cylinder. The two are supported by two round steel plates at the bottom of the cylinder and on the pump body, serving as a top cover and base, respectively, with several sparsely spaced columns in between. The columns have limited pressure resistance, and under increased pressure from the external hydraulic cylinder, their insufficient rigidity makes them prone to bending and deformation, even causing the connecting bolts to break, posing a safety hazard on site. The bent columns also severely affect the balance of the ceramic plunger. Secondly, the pump body's sealing mechanism is substandard. After a period of use, material frequently splashes out from the sealing joints. This wastes material and affects the accurate measurement of material delivery; it also causes inconvenience and pollution to the work environment; and the intermittent splashing necessitates the replacement of seals, reducing production efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects, solve the corresponding technical problems, and provide a double-sealed pump body structure and a stable upper and lower pump body frame, which ensures the safety of workers, reduces material waste, and improves the production efficiency of enterprises.

[0006] The technical solution adopted by this invention to solve the aforementioned technical problems is: a double-sealed cloth-reinforced plunger pump, characterized in that the pump body innovatively uses a double-layer seal. The main principle is to use a combined sealing layer + plunger sealing water ring and Y-type cloth-reinforced seal to form a double-layer seal. Among them, the combined sealing layer is the first layer of sealing structure, and the plunger sealing water ring and Y-type cloth-reinforced seal are the second layer of sealing structure. However, they must be aligned with the high-pressure liquid entering at the same height as the plunger sealing water ring. The pressure of the high-pressure liquid must be greater than the material pressure to ensure the tightness of the second layer of sealing structure. The high-pressure liquid inlet and outlet are aligned with the plunger sealing water ring and embedded in the cylinder body. The two ports are symmetrically arranged, and the high-pressure liquid enters and flows out from the inlet and outlet. The sparse columns are transformed into two symmetrical and thick hook-shaped vertical plates, which are connected by hook-shaped pressure plates and bolts with a cylinder fixing plate to form a stable and sturdy "U"-shaped frame. The upper end supports the external hydraulic cylinder, and the lower end supports the upper and lower pump bodies, thus forming the pump body frame.

[0007] Furthermore, the specific structure of the double-layer sealed pump body is as follows: a packing layer is set at the bottom of the upper pump body, and three sealing layers are set immediately above the packing layer. Each layer consists of (support ring + Y-shaped fabric reinforcement). These three layers are stacked in sequence to form a triple seal, constituting the first layer of the double-sealed structure. The second layer is mainly composed of a plunger sealing water ring. Y-shaped fabric reinforcement is set on both the upper and lower surfaces of the plunger sealing water ring, and high-pressure inlet and outlet liquid ports are symmetrically embedded in the center of the plunger sealing water ring. The pressure of the liquid inlet must be greater than the pressure of the material inlet. In this way, even if the first layer of seal is damaged, the material pressure will be less than the liquid pressure under the action of the high-pressure liquid in the second layer, and the material will not overflow or splash out, forming the second high-pressure seal. In summary, the combination of the sealing layer + plunger sealing water ring + high-pressure liquid injected at the same height as the plunger sealing water ring constitutes the double seal of the pump body, realizing the double sealing performance of the pump body.

[0008] Furthermore, the two vertical hook plates and the two horizontal cylinder fixing plates are connected by bolts and hook pressure plates to form a "U"-shaped frame. The structure is stable and not easily deformed, which lays the foundation for supporting the external hydraulic cylinder at the top and connecting the upper and lower pump bodies at the bottom. This frame provides the basic conditions for stabilizing the pump body. The balance of the ceramic plunger connected to the piston rod is no longer affected by the fixed frame and will not tilt. The double-sealed pump body is stably fixed on the cylinder fixing plate.

[0009] The present invention provides a double-sealed fabric-reinforced plunger pump, which has the advantages of stable structure, flexible design, and material saving, thereby reducing maintenance costs, optimizing the working environment, and improving enterprise production efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating the principle of the double-sealed cloth-reinforced plunger pump of the present invention.

[0011] Figure 2 This is a schematic diagram of the assembly of the hook head upright plate, hook head pressure plate, and bolts of a double-sealed fabric-reinforced plunger pump according to the present invention.

[0012] Figure 3 This is a schematic diagram of the assembly of a double-sealed fabric-reinforced plunger pump according to the present invention.

[0013] Figure 4 This is a schematic diagram of the support ring and Y-shaped fabric-reinforced assembly of a double-sealed fabric-reinforced plunger pump according to the present invention.

[0014] Figure 5 This is a schematic diagram of the assembly of the plunger sealing water ring and the Y-shaped fabric reinforcement in a double-sealed fabric-reinforced plunger pump according to the present invention.

[0015] Attached reference numerals: 1-Inlet / outlet connecting flange, 2-Lower pump body, 3-Ceramic plunger, 4-Hook head upright plate, 5-Cylinder fixing plate, 6-External hydraulic cylinder, 7-Oil pipe, 8-Return plate, 9-Piston rod, 30-Cylinder body, 31-Packing, 32-Y-type fabric-reinforced composite sealing layer (first sealing layer), 33-Plunger sealing water ring, 34-High-pressure inlet / outlet liquid port, 35-Drainage hole, 36-Y-type fabric reinforcement, 37-Support ring, 41-Hook head pressure plate. Detailed Implementation Plan

[0016] The technical solutions of the present invention will be described below with reference to the accompanying drawings of an embodiment of a double-sealed fabric-reinforced plunger pump. The described embodiments are only a portion of the preferred embodiments of the present invention, and not all of them. All other embodiments without inventive step made by those skilled in the art based on the embodiments of the present invention are within the protection scope of the present invention. Example

[0017] Material enters through the inlet flange 1, passes through the upper and lower pump bodies and the check valve, and is finally discharged through the outlet flange. In this process, the upper and lower pump bodies and the check valve play a key role. The specific structure of the upper and lower pump bodies is as follows: the lower pump body 2 and the upper pump body are combined to form the pump body, with a built-in check valve in the lower pump body. The upper pump body is fixed to the cylinder mounting plate 5. The piston rod of the external hydraulic cylinder 6 is connected to the ceramic plunger 3. The external hydraulic cylinder 6 draws in and discharges hydraulic oil, driving the piston rod 9 to move up and down. The piston rod 9 is also connected to the ceramic plunger 3. Therefore, as the piston rod moves, the ceramic plunger 6 rises and falls within the pump body. During this process, the piston rod drives the ceramic plunger to rise, and material is drawn in through the inlet flange. The inlet check valve opens, and material fills the space below the ceramic plunger 3. When the piston rod drives the ceramic plunger to fall, the inlet check valve closes, and the outlet check valve opens, allowing material to be discharged through the outlet flange. This cycle repeats continuously, completing the material's entry and exit.

[0018] Two hook-shaped upright plates 4 and two cylinder fixing plates 5 are bolted together by hook-shaped pressure plates 41 to form a "U"-shaped frame with a stable structure. From the front, the hook-shaped upright plate 4 looks like a "I"-shaped steel plate with widened ribs, standing upright on both sides of the upper pump body. Its height is slightly longer than the length of the piston rod, which facilitates the rise and fall of the ceramic plunger. The external hydraulic cylinder 6 realizes the up and down movement of the piston rod through the oil pipe 7. When the ceramic plunger rises to its maximum height and hits the return plate 8, the ceramic plunger can no longer rise. An electrical signal is given, and the plunger immediately enters the descent program. The return plate 8 plays the role of preventing the ceramic plunger from moving upward.

[0019] The double-sealing principle of the plunger pump is as follows: A layer of packing 31 is laid inside the cylinder 30 at the bottom of the upper pump body. Adjacent to the packing are three sets of sealing layers, each consisting of a support ring 37 and a Y-shaped fabric reinforcement 36. These three sets are stacked sequentially to form a Y-shaped fabric reinforcement combined sealing layer 32, which is the first layer of the double-sealing structure. The second layer mainly consists of a plunger sealing water ring 33. Y-shaped fabric reinforcement 36 is provided on both the upper and lower surfaces of the plunger sealing water ring 33, improving its sealing performance. High-pressure inlet and outlet liquid ports 34 are symmetrically embedded in the center of the plunger sealing water ring. The pressure at the liquid inlet must be greater than the pressure at the material inlet. This ensures that even if the first layer of seal is damaged, the material pressure will be lower than the liquid pressure under the action of the second layer of high-pressure liquid, preventing the material from overflowing or splashing out, thus forming a second layer of high-pressure seal. The drainage hole 35 is located above the high-pressure liquid inlet on the upper pump body. If some high-pressure liquid leaks out, it needs to be guided out through the drainage hole. It can be seen that the combined sealing layer, the plunger sealing water ring, the high-pressure liquid inlet and outlet ports that are flush with the plunger sealing water ring, the injected high-pressure liquid, and the drainage hole are all essential conditions for achieving a double seal on the pump body.

Claims

1. A double-sealed cloth-type plunger pump of a double-sealed structure and an upper and lower pump body frame, characterized by, The combination sealing layer + plunger sealing water ring and Y type cloth seal are used to form double layer sealing; the specific structure of the double layer sealing pump body is that a packing is arranged at the bottom of the upper pump body, and a combination sealing layer is arranged above the packing, each layer is composed of a support ring + Y type cloth, and three groups are sequentially stacked to form the first layer of the double sealing structure; the second layer is mainly composed of a plunger sealing water ring, Y type cloths are arranged on the upper and lower surfaces of the plunger sealing water ring, and high pressure inlet and outlet liquid ports are symmetrically embedded in the center of the plunger sealing water ring, the pressure of the inlet liquid port is greater than the pressure of the material inlet; the drainage hole is arranged above the high pressure inlet liquid port of the upper pump body to guide the leaked liquid to flow out.

2. A double sealed, cloth-jacked plunger pump according to claim 1, characterized in that: The upper and lower pump body frames are connected into a "mouth" type square frame by bolts and hook head pressing plates, the hook head vertical plates are like a "work" type steel plate with widened ribs, and the height of the hook head vertical plate is longer than the length of the piston rod.

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