Plunger pump plunger sealing water isolation system

Abstract

The utility model provides a sealing water isolation system for a plunger of a plunger pump, which belongs to the technical field of plunger pumps and comprises a water storage ring, a connecting pipeline, a water supply pump and a one-way valve. According to the plunger sealing water isolation system of the plunger pump, when the main pump is in the water suction stroke, clean water is continuously injected into the water storage bin of the water storage ring, a clean water isolation area is formed while the surface of the plunger is cleaned, and therefore hard particles in an inner cavity of the valve box are prevented from entering the sealing position of the plunger; and when the main pump is in the drainage stroke, water supply to the water storage bin is stopped, a clean water isolation area, adjacent to slurry in the main pump, of the water storage bin is polluted and is squeezed out by newly injected clean water in the next water suction stroke, and updating of water in the clean water isolation area is completed. Due to the fact that the drainage stroke time of the main pump is short, only partial area, close to slurry in the main pump, of the clear water isolation area is polluted and then can be squeezed out by newly injected clear water, and a plunger and sealing filler cannot be abraded.

Description

Technical Field

[0001] The utility model belongs to the technical field of plunger pumps, and more specifically relates to a plunger pump plunger sealing water isolation system. Background Art

[0002] Due to the safety requirements of coal mines, coal mines have started various forms of large-scale grouting projects. At present, the projects can be roughly divided into three types: roof and floor grouting, overburden separation grouting and goaf backfill grouting; coal mine grouting is divided into slurry grouting and paste grouting according to different grouting processes. The plunger pump is a device that meets the slurry grouting process. The plunger pump can be divided into a power end and a hydraulic end. The hydraulic end mainly includes a valve box, a valve assembly and a plunger. The valve box and the plunger are sealed by a sealing packing. Because the slurry contains a large amount of hard particles, the hard particles enter the plunger seal during the operation of the plunger (the plunger seal is the area where the sealing packing is located), which will cause the plunger and the sealing packing to wear too quickly. Frequent replacement seriously affects the progress of the project and increases the operation and maintenance cost. Utility Model Content

[0003] The utility model aims to provide a plunger pump plunger seal water isolation system, aiming to solve the problem that hard particles in the slurry will enter the plunger seal of the plunger pump, thereby causing the plunger and sealing packing to wear too quickly, and frequent replacement seriously affects the project progress and increases the operation and maintenance costs.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a plunger pump plunger seal water isolation system, including: a water storage ring, a connecting pipeline, a water supply pump and a one-way valve; the water storage ring is installed at the seal between the valve box and the plunger, and the water storage ring is provided with a water storage tank connected to the inner cavity of the valve box; one end of the connecting pipeline is fixedly installed on the valve box, and the connecting pipeline is connected to the water storage tank; the water supply pump injects clean water into the water storage tank through the connecting pipeline; the one-way valve is installed on the connecting pipeline.

[0005] In a possible implementation, the water storage ring is located at the front end of the sealing portion of the plunger.

[0006] In a possible implementation, the water supply pump is a volumetric pump or a centrifugal pump.

[0007] In a possible implementation, the connecting pipeline includes a main water pipe and multiple branch water pipes; the water supply pump is connected to the main water pipe, and the multiple branch water pipes are arranged along the length direction of the main water pipe, and the branch water pipes correspond to the plungers one by one.

[0008] In a possible implementation, the water storage bin is an annular groove provided on the inner circumferential surface of the water storage ring.

[0009] In a possible implementation, there are multiple water storage bins, which are arranged axially along the water storage ring, and adjacent water storage bins are interconnected.

[0010] In a possible implementation, an accumulator is installed on the connecting pipeline.

[0011] In a possible implementation, a pressure transmitter is installed on the connecting pipeline.

[0012] In a possible implementation, a safety valve is installed on the connecting pipeline.

[0013] The scheme shown in the embodiment of the present application is compared with the prior art. The utility model is a plunger pump plunger seal water isolation system, in which a water storage ring is installed between the valve box and the plunger, and a water storage tank connected to the inner cavity of the valve box is provided on the water storage ring, and the water supply pump injects clean water into the water storage ring through the connecting pipeline. When the main pump is in the water suction stroke, the inner cavity of the valve box is low pressure or even negative pressure. At this time, the pressure of the water isolation system is higher than the pressure in the cavity of the valve box, the one-way valve is opened, and clean water is continuously injected into the water storage tank of the water storage ring, cleaning the surface of the plunger and forming a clean water isolation zone, thereby preventing hard particles in the inner cavity of the valve box from entering the seal of the plunger; when the main pump is in the drainage stroke, the pressure in the cavity of the valve box rises rapidly, and when it is higher than the pressure of the water isolation system, the one-way valve is closed, and water supply to the water storage tank is stopped. The clean water isolation zone adjacent to the water storage tank and the slurry in the main pump is polluted until the main pump is drained, and is squeezed out by the newly injected clean water in the next water suction stroke, completing the renewal of the water quality in the clean water isolation zone. Since the drainage stroke time of the main pump is short, only the part of the clean water isolation area close to the slurry in the main pump is contaminated, and it will be squeezed out by the newly injected clean water immediately, so it will not cause wear to the plunger and sealing packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic structural diagram of a plunger pump plunger seal water isolation system provided by an embodiment of the utility model;

[0016] Figure 2 A partial cross-sectional structural schematic diagram of a plunger pump plunger seal water isolation system provided by an embodiment of the utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0018] In the figure: 1, valve box; 101, plunger; 102, water storage ring; 103, water supply pump; 104, one-way valve; 105, water storage tank; 106, main water pipe; 107, water distribution pipe; 108, first through hole; 109, second through hole; 111, accumulator; 112, pressure transmitter; 113, safety valve; 114, sealing packing. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Please also read Figures 1 to 3 Now, a plunger pump plunger seal water isolation system provided by the utility model is described. The plunger pump plunger seal water isolation system comprises: a water storage ring 102, a connecting pipeline, a water supply pump 103 and a one-way valve 104; the water storage ring 102 is installed at the sealing position between the valve box 1 and the plunger 101, and a water storage tank 105 connected to the inner cavity of the valve box 1 is provided on the water storage ring 102; one end of the connecting pipeline is fixedly installed on the valve box 1, and the connecting pipeline is connected to the water storage tank 105; the water supply pump 103 injects clean water into the water storage tank 105 through the connecting pipeline; the one-way valve 104 is installed on the connecting pipeline.

[0021] The plunger pump plunger seal water isolation system provided in this embodiment has a water storage ring 102 installed between the valve box 1 and the plunger 101 compared with the prior art. The water storage ring 102 is provided with a water storage tank 105 connected to the inner cavity of the valve box 1, and the water supply pump 103 injects clean water into the water storage ring 102 through a connecting pipeline. When the main pump is in the water suction stroke, the inner cavity of the valve box 1 is at low pressure or even negative pressure. At this time, the pressure of the water isolation system is higher than the pressure in the cavity of the valve box 1, the one-way valve 104 is opened, and clean water is continuously injected into the water storage tank 105 of the water storage ring 102, cleaning the surface of the plunger 101 while forming a clean water isolation zone, thereby preventing hard particles in the inner cavity of the valve box 1 from entering the seal of the plunger 101; when the main pump is in the drainage stroke, the pressure in the cavity of the valve box 1 rises rapidly. When it is higher than the pressure of the water isolation system, the one-way valve 104 is closed, and water supply to the water storage tank 105 is stopped. The clean water isolation area adjacent to the water storage tank 105 and the slurry in the main pump is contaminated until the main pump completes drainage and is squeezed out by the newly injected clean water in the next water suction stroke, completing the renewal of the water quality in the clean water isolation area. Since the drainage stroke time of the main pump is short, only part of the clean water isolation zone close to the slurry in the main pump is contaminated, and then it will be squeezed out by the newly injected clean water, so it will not cause wear to the plunger 101 and the sealing packing 114.

[0022] In this embodiment, the one-way valve 104 is installed at one end of the connecting pipeline away from the water supply pump 103 , and the other end of the one-way valve 104 is fixed on the valve box 1 .

[0023] In some embodiments, see Figures 1 to 3 , the water storage ring 102 is located at the front end of the sealing part of the plunger 101. In this embodiment, the water storage ring 102 is placed at the front end of the sealing part of the plunger 101, that is, the water storage ring 102 is located at the front end of the sealing packing 114. During the drainage process of the main pump, a small amount of slurry will enter the water storage tank 105, which can minimize the contact between the slurry and the plunger 101 and the sealing packing 114.

[0024] In some embodiments, the water supply pump 103 is a positive displacement pump or a centrifugal pump. In this embodiment, the water supply pump 103 is preferably a positive displacement pump.

[0025] In some embodiments, see Figure 1 , the connecting pipeline includes a main water pipe 106 and multiple water branch pipes 107; the water supply pump 103 is connected to the main water pipe 106, and multiple water branch pipes 107 are arranged along the length direction of the main water pipe 106, and the water branch pipes 107 correspond to the plungers 101 one by one. In this embodiment, the valve box 1 includes multiple cavities, and a plunger 101 is correspondingly installed on each cylinder body, so the number of water branch pipes 107 is consistent with the number of plungers 101 on the valve box 1. Under the action of the water supply pump 103, clean water passes through the main water pipe 106 and the water branch pipe 107 in turn, and then is evenly distributed to the water storage tank 105 of each plunger 101. The one-way valve 104 is installed at the water outlet end of the water branch pipe 107, and the valve box 1 is provided with a first through hole 108 for installing the one-way valve 104.

[0026] In some embodiments, see Figures 1 to 3 , the water storage tank 105 is an annular groove provided on the inner circumference of the water storage ring 102. In the present embodiment, the water storage tank 105 is provided on the inner circumference of the water storage ring 102, and the water storage tank 105 is an annular groove, which is coaxial with the water storage ring 102, thereby forming a uniform water storage space on the outer circumference of the plunger 101. A second through hole 109 connected to the water storage tank 105 is provided radially of the water storage ring 102. The first through hole 108 and the second through hole 109 are connected. The entire inner circumference of the water storage ring 102 located on the side of the water storage tank 105 close to the inner cavity of the valve box 1 leaves a uniform gap with the plunger 101.

[0027] In some embodiments, see Figures 1 to 3, there are multiple water storage bins 105, which are arranged along the axial direction of the water storage ring 102, and the adjacent water storage bins 105 are interconnected. In this embodiment, the number of water storage bins 105 is at least two, and multiple water storage bins 105 are arranged along the axial direction of the water storage ring 102. The area of ​​the water storage ring 102 located between two adjacent water storage bins 105 maintains a uniform gap with the plunger 101 in the circumferential direction, thereby connecting the two adjacent water storage bins 105. When the water storage bin 105 located at the front end of the seal of the plunger 101 is contaminated, the water storage bin 105 at the rear end can effectively isolate the water storage bin 105 at the front end, forming a multi-level isolation. If the space is limited and only one water storage bin 105 can be set, the length of the water storage bin 105 should be as long as possible, and the water volume should be as large as possible, so as to minimize the concentration of the clean water in the water storage bin 105 after being contaminated, and achieve effective protection. The second through hole 109 is connected to the water storage bin 105 located at the rear end.

[0028] In some embodiments, see Figure 1 , an accumulator 111 is installed on the connecting pipeline. In this embodiment, the water isolation system is only injected with water when the main pump is in the water suction stroke, and the number of times the main pump is in the water suction stroke changes periodically, which causes the equivalent water outlet diameter of the water isolation system to change periodically, resulting in large pressure fluctuations in the water isolation system. The accumulator 111 can balance the pressure fluctuations of the water isolation system and extend the service life of key components and connecting pipelines. The accumulator 111 is located at the end of the connecting pipeline.

[0029] In some embodiments, see Figure 1 , a pressure transmitter 112 is installed on the connecting pipeline. In this embodiment, the pressure transmitter 112 can collect the pressure of the water isolation system. When the pressure rises abnormally, it is mostly because the one-way valve 104 is not sealed tightly or completely fails. This can be used as a basis for judging whether the one-way valve 104 is sealed reliably and issuing an early warning signal.

[0030] In some embodiments, see Figure 1 A safety valve 113 is installed on the connecting pipeline. In this embodiment, when the pressure of the water isolation system continues to increase, the safety valve 113 is activated to release the pressure to ensure the safety of the system.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plunger pump plunger seal water isolation system, characterized in that: include: A water storage ring, a connecting pipeline, a water supply pump and a one-way valve; the water storage ring is installed at the seal between the valve box and the plunger, and the water storage ring is provided with a water storage tank connected to the inner cavity of the valve box; one end of the connecting pipeline is fixedly installed on the valve box, and the connecting pipeline is connected to the water storage tank; the water supply pump injects clean water into the water storage tank through the connecting pipeline; the one-way valve is installed on the connecting pipeline.

2. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: The water storage ring is located at the front end of the sealing part of the plunger.

3. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: The water supply pump is a volumetric pump or a centrifugal pump.

4. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: The connecting pipeline includes a main water pipe and a plurality of branch water pipes; the water supply pump is connected to the main water pipe, and the plurality of branch water pipes are arranged along the length direction of the main water pipe, and the branch water pipes correspond to the plungers one by one.

5. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: The water storage bin is an annular groove formed on the inner circumferential surface of the water storage ring.

6. A plunger pump plunger seal water isolation system as claimed in claim 5, characterized in that: There are multiple water storage bins, which are arranged along the axial direction of the water storage ring, and adjacent water storage bins are connected to each other.

7. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: An accumulator is installed on the connecting pipeline.

8. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: A pressure transmitter is installed on the connecting pipeline.

9. A plunger pump plunger seal water isolation system as claimed in claim 1, characterized in that: A safety valve is installed on the connecting pipeline.

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