A slurry separation structure and a plunger slurry pump

Abstract

The present application relates to the field of plunger pump, disclose a kind of slurry separation structure and plunger slurry pump, including pump body, flow guide pipe is equipped in pump body, the middle part of flow guide pipe is equipped with the isolation ring that follows plunger movement and moves up and down with action.Pumper upper part side end is equipped with plunger channel with medium oscillation cavity communication, plunger channel is connected with packing box, packing box is equipped with plunger, which can reciprocate transversely in plunger channel, flow guide pipe is located outside the lateral of plunger activity range.The present application can separate slurry medium, and effectively avoid the full turbulence of backwash medium and slurry medium, and plunger can be removed from the front end of pump body for maintenance, due to the existence of turbulence isolation ring, effectively shorten the size of pump body, improve the reliability of pump, maintainability, reduce manufacturing cost and improve the service life of spare parts.

Description

Technical Field

[0001] This invention relates to the field of plunger pumps, and more specifically to a slurry separation structure and a plunger slurry pump. Background Technology

[0002] A plunger slurry pump is a device that transports slurry by changing the volume of a sealed working cavity through the reciprocating motion of a plunger within a cylinder. For example... Figure 1 As shown, the existing plunger slurry pump mainly includes a vertical pump body 1, a medium oscillation chamber 2 inside the pump body 1, a one-way outlet valve connected to the top of the pump body 1, a one-way inlet valve connected to the bottom of the pump body 1, a vertical guide pipe 3 passing through the medium oscillation chamber 2, the one-way outlet valve being connected to the top of the guide pipe 3, and a stuffing box 4 being horizontally connected to the upper end of the medium oscillation chamber 2. A plunger 5 is installed inside the stuffing box 4. Figure 2 As shown, the axis of plunger 5 intersects perpendicularly with the axis of guide tube 3.

[0003] In this structure, when the plunger 5 is at its dead center, the medium can enter the stuffing box 4. Since the stuffing box 4 is horizontally positioned, some slurry medium can accumulate there, gradually entering the plunger 5 and the seal, causing the plunger 5 and seal to fail. To avoid this, existing technologies employ a longer pump body structure, coupled with a long guide pipe 3. The primary volume of the medium oscillation chamber 2 is much larger than the primary volume of the plunger's movement. During pumping, gravity causes the lower layer of the medium in the oscillation chamber 2 to be primarily slurry medium, while the upper layer is clearer medium. Furthermore, a backflushing port 6 is provided at the front end of the plunger 5, providing the injection medium in the opposite direction to the plunger 5's movement. This flushes away the slurry medium particles adhering to the plunger 5's surface and separates the injection medium from the slurry medium.

[0004] Initially, the above measures effectively reduced the ingress of slurry medium into the plunger 5 seal. However, due to the lack of turbulence isolation measures in the medium oscillation chamber 2 outside the guide pipe 3, after long-term operation, the slurry medium at the bottom gradually mixes to varying degrees with the injection medium entering through the backflushing port 6 under the influence of fluid turbulence. This results in three poorly defined regions: "injection medium region 201," "injection medium and slurry medium mixing region 202," and "slurry medium region 203." After a considerable period, the injection medium and slurry medium will still mix thoroughly, and a large amount of slurry medium will still enter the plunger 5 seal. Furthermore, during the plunger 5 return stroke, a significant portion of the return stroke area already contains slurry medium. In these areas, the slurry medium deposits and cannot be automatically discharged, further exacerbating damage to the plunger 5 and the seal, severely reducing its service life. In addition, the use of a longer pump body 1 structure has led to increased costs. The axes of the plunger 5 and the guide pipe 3 are perpendicular to each other, which means that the plunger 5 can only be disassembled and repaired from the rear end. The rear end has a relatively complex power transmission and sealing structure, which makes maintenance very inconvenient. Summary of the Invention

[0005] The present invention aims to provide a slurry separation structure to solve the problem that slurry medium enters the plunger and seal during the operation of existing plunger slurry pumps, causing plunger and seal failure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a slurry separation structure, comprising a vertically placed pump body, a vertically arranged medium oscillation chamber within the pump body, a vertically arranged guide pipe within the medium oscillation chamber, the top end of the guide pipe being fixed to the pump body, a plunger channel communicating with the medium oscillation chamber being opened at the upper side end of the pump body, an upper limit ring being provided in the upper section of the guide pipe, a lower limit ring being provided above the medium inlet at the bottom of the guide pipe, an isolation ring being sleeved in the middle of the guide pipe, an upper elastic support being sleeved on the guide pipe between the isolation ring and the upper limit ring, the upper elastic support restricting the isolation ring to be located below the plunger channel, and a lower elastic support being sleeved on the guide pipe between the isolation ring and the lower limit ring.

[0007] Preferably, as an improvement, the outer wall of the upper section of the isolation ring is inclined towards the axis to form a conical surface.

[0008] Preferably, as an improvement, a gap is provided between the outer wall of the isolation ring and the inner wall of the medium oscillation chamber.

[0009] Preferably, as an improvement, both the upper elastic support and the lower elastic support are springs.

[0010] The principle of this design is as follows: An isolation ring and a following spring are installed outside the guide tube to prevent sufficient turbulence of the fluid. During the reciprocating motion of the plunger, the isolation ring moves together with the medium, physically restricting the upward flow of the slurry medium in the lower layer of the media oscillation chamber, thus preventing sufficient turbulent mixing between the injected medium and the slurry medium. Therefore, the interface between the upper injected medium and the lower slurry medium is very clear, ensuring that the medium in contact with the plunger and seal is free of slurry particles, thereby greatly extending the service life of the plunger and seal.

[0011] Due to the presence of the isolation ring, the "injected medium area", "injected medium and medium mixing area" and "medium area" cannot be fully mixed. Under the condition of ensuring that the turbidity of the medium in contact with the plunger is the same, the pump body and guide pipe in this technical solution are much smaller in size than the pump body structure of the prior art, which is conducive to reducing costs.

[0012] The present invention also provides a plunger slurry pump, which adopts the above-mentioned slurry separation structure. The plunger channel is arranged laterally on the pump body and intersects with the medium oscillation chamber in a partial manner. The plunger channel is connected to a stuffing box, and the stuffing box is provided with a plunger that can move laterally back and forth in the plunger channel. The guide pipe is located outside the plunger's range of motion.

[0013] Preferably, as an improvement, the plunger channel extends laterally through the pump body, and an end cap is connected to the other end of the plunger channel.

[0014] Preferably, as an improvement, the dead point of the plunger during reciprocating motion is located within the plunger channel.

[0015] Preferably, as an improvement, the stuffing box is provided with a backwashing port.

[0016] Preferably, as an improvement, the medium oscillation chamber is an inner conical opening at the bottom of the pump body, and the bottom of the guide pipe is a cone head, with the cone head partially extending into the inner conical opening. Multiple medium inlets are provided circumferentially on the side wall of the guide pipe above the cone head.

[0017] Preferably, as an improvement, an outlet valve assembly is connected to the top of the pump body, and the outlet valve assembly is connected to the top of the guide pipe; an inlet valve assembly is connected to the bottom of the pump body, and the inlet valve assembly is connected to the inner cone port.

[0018] The principle of this solution is as follows: Based on the aforementioned isolation ring and spring on the guide pipe, the position between the plunger and the guide pipe is improved. The plunger channel on the pump body is offset from the medium oscillation chamber, with only partial communication between the plunger channel and the medium oscillation chamber to ensure the pumping of the medium within the chamber by the plunger's movement. The offset axis of the plunger and the guide pipe ensures a staggered distribution, preventing the guide pipe from restricting the plunger's movement range. This allows the plunger's back dead point to move forward. When the plunger is at its back dead point, the medium will not enter the stuffing box, but will only remain near the pump body and the guide pipe. Therefore, even if a small amount of slurry particles deposit, they will remain in the medium oscillation chamber, preventing them from entering the plunger and the seal, further avoiding plunger and seal failure. Furthermore, the plunger channel is designed to penetrate the pump body and is sealed by an end cap. However, during maintenance, the plunger can be removed from the front end of the pump body, making maintenance more convenient, improving pump reliability and maintainability, reducing manufacturing costs, and extending the service life of spare parts.

[0019] The advantages of this invention include:

[0020] 1. The slurry separation structure and plunger slurry pump of the present invention can effectively ensure that the medium in contact with the plunger and the seal is a clear medium, and prevent slurry particles from entering the plunger and seal and causing damage, thus greatly improving the service life of the plunger and seal.

[0021] 2. Because the plunger and the guide pipe inside the pump body are arranged eccentrically and offset, the plunger can be removed from the front end of the pump body, which greatly improves the ease of maintenance.

[0022] 3. Due to the presence of the isolation ring that prevents turbulence, the turbidity resistance of the injected medium and slurry medium is effectively improved. Therefore, under the same capacity, the pump body length of this invention is much smaller, reducing manufacturing costs. Furthermore, the lower center of gravity of the pump improves the stability of the pump body components.

[0023] 4. Because the pumped slurry medium is fully separated from the injected medium, the parts inside the stuffing box are used in a clear medium, which greatly improves the service life and reduces, for example, operating costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the existing technology.

[0025] Figure 2 This is a schematic diagram showing the lateral position of the plunger and the guide tube in the prior art.

[0026] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0028] Figure 5 This is a partial transverse cross-sectional view of the plunger channel in Embodiment 2 of the present invention. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method:

[0030] The reference numerals in the accompanying drawings include: pump body 1, medium oscillation chamber 2, guide pipe 3, stuffing box 4, plunger 5, backwash port 6, plunger channel 7, back dead point 8, end cover 9, upper limit ring 10, upper spring 11, isolation ring 12, lower spring 13, lower limit ring 14, medium inlet 15, inner cone 16, inlet valve sleeve 17, inlet valve 18, inlet valve seat 19, pressure ring 20, power mechanism 21, push rod 22, outlet pipe 23, outlet valve sleeve 24, outlet valve 25, outlet valve seat 26, injection medium area 201, injection medium and slurry medium mixing area 202, and slurry medium area 203.

[0031] Example 1, basically as shown in the attached document. Figure 3 As shown: A slurry separation structure includes a vertically placed pump body 1, a vertically positioned medium oscillation chamber 2 inside the pump body 1, a vertically positioned guide pipe 3 inside the medium oscillation chamber 2, the top end of the guide pipe 3 being supported and fixed to the pump body 1 by a positioning step, and a plunger channel 7 communicating with the medium oscillation chamber 2 being opened on the upper side end of the pump body 1. An upper limit ring 10 is screwed to the upper section of the guide pipe 3, the bottom end of the guide pipe 3 is a cone, and four medium inlets 15 are circumferentially opened on the side wall of the guide pipe 3 above the cone. A lower limit ring 14 is screwed to the medium inlet 15 at the bottom of the guide pipe 3, an isolation ring 12 is sleeved in the middle of the guide pipe 3, an upper spring 11 is sleeved on the guide pipe 3 between the isolation ring 12 and the upper limit ring 10, the upper spring 11 restricting the isolation ring 12 to be located below the plunger channel 7, and a lower spring 13 is sleeved on the guide pipe 3 between the isolation ring 12 and the lower limit ring 14. The upper outer wall of the isolation ring 12 is inclined towards the axis to form a conical surface, and a gap is provided between the outer wall of the isolation ring 12 and the inner wall of the medium oscillation cavity 2 for the medium to pass through.

[0032] Example 2. A plunger slurry pump, such as Figure 4 As shown, the pump includes a power mechanism 21, a stuffing box 4, and the slurry separation structure of Example 1. The power mechanism 21 is a crank-slider mechanism driven by a motor, and the slider of the crank-slider mechanism is bolted to a push rod 22. A plunger channel 7 is laterally arranged on the pump body 1, and the plunger channel 7 partially intersects with the medium oscillation chamber 2. The stuffing box 4 is connected to the plunger channel 7, and a plunger 5 is provided inside the stuffing box 4. The plunger 5 is connected to the push rod 22 via a coupling. The plunger 5 can perform lateral reciprocating motion under the drive of the power mechanism 21. The back dead point 8 of the plunger 5 during reciprocating motion is located inside the plunger channel 7. A backwashing port 6 is provided on the stuffing box 4. Figure 5 As shown, the guide pipe 3 is located outside the range of motion of the plunger 5, the plunger channel 7 runs horizontally through the pump body 1, the primary volume of the plunger channel 7 is smaller than the primary volume of the medium oscillation chamber 2, and the other end of the plunger channel 7 is bolted to the end cap 9.

[0033] The medium oscillation chamber 2 has an inner conical opening 16 at the bottom of the pump body 1, and the cone at the bottom of the guide pipe 3 partially extends into the inner conical opening 16. An outlet valve 25 assembly is connected to the top of the pump body 1. The outlet valve 25 assembly includes, from top to bottom, an outlet pipe 23, an outlet valve sleeve 24, an outlet valve 25, and an outlet valve seat 26, all bolted together. The outlet valve 25 communicates with the top of the guide pipe 3 through the outlet valve seat 26. An inlet valve 18 assembly is connected to the bottom of the pump body 1. The inlet valve 18 assembly includes, from bottom to top, a pressure ring 20, an inlet valve seat 19, an inlet valve 18, and an inlet valve sleeve 17, all bolted together. The inlet valve 18 communicates with the inner conical opening 16 through the inlet valve sleeve 17.

[0034] The specific implementation process is as follows: When pumping slurry medium, a certain amount of injection medium is provided from the backwash port 6. Driven by the power mechanism 21, the plunger 5 performs a lateral reciprocating motion, causing a change in the volume of the plunger channel 7 to generate suction force, drawing the slurry medium from the inlet valve 18 assembly into the medium oscillation chamber 2. The isolation ring 12 floats up and down with the movement of the plunger 5 as the medium flows. During this floating process, the isolation ring 12 is supported and limited by the upper spring 11 and the lower spring 13. The slurry medium fills the lower part of the medium oscillation chamber 2. When it flows upward after being suctioned, it is blocked by the isolation ring 12, resulting in less entry into the active area of ​​the isolation ring 12. The injection medium fills the plunger channel 7 and the upper part of the medium oscillation chamber 2. When it flows downward after being pushed by the plunger 5, it is blocked by the isolation ring 12. However, due to the inclined structure of the isolation ring 12, it can more easily enter below the isolation ring 12 compared to the slurry medium, resulting in the injection medium being relatively stably suppressed above the slurry medium. In this way, an injection medium region 201 is formed above the isolation ring 12, a slurry medium region 203 is formed below the isolation ring 12, and an injection medium and slurry medium mixing region 202 is formed near the isolation ring 12 in the medium oscillation chamber 2. It is difficult for the slurry medium to enter the injection medium region 201, thereby effectively reducing the entry of slurry medium particles into the plunger 5 and the seal.

[0035] The plunger channel 7 is designed to penetrate the pump body 1, and the plunger 5 and the guide pipe 3 are staggered. The guide pipe 3 does not restrict the movement range of the plunger 5, allowing the rear dead point 8 of the plunger 5 to move forward into the pump body 1. When the plunger 5 is at the rear dead point 8, the medium will not enter the stuffing box 4, but will only enter near the pump body 1 and the guide pipe 3. Even if a small amount of slurry medium enters the plunger channel 7, it will not enter the stuffing box 4 and affect the plunger 5 and the seal. The plunger channel 7 penetrating the pump body 1 also provides a port for maintenance of the plunger 5 from the front, making the maintenance of the plunger 5 slurry pump more convenient.

[0036] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A plunger slurry pump, employing a slurry separation structure, the slurry separation structure comprising a vertically placed pump body, a vertically arranged medium oscillation chamber within the pump body, a vertically arranged guide pipe within the medium oscillation chamber, the top end of the guide pipe being fixed to the pump body, and a plunger channel communicating with the medium oscillation chamber being opened at the upper side end of the pump body, characterized in that: The upper section of the guide tube is provided with an upper limit ring, the bottom of the guide tube is provided with a lower limit ring above the medium inlet, the middle part of the guide tube is provided with an isolation ring, the guide tube between the isolation ring and the upper limit ring is provided with an upper elastic support, the upper elastic support restricts the isolation ring to be located below the plunger channel, and the guide tube between the isolation ring and the lower limit ring is provided with a lower elastic support. The plunger channel is horizontally arranged on the pump body, and the plunger channel partially intersects with the medium oscillation chamber. The plunger channel adopts a design that runs through the pump body, and the plunger and the guide pipe are staggered. The guide pipe does not restrict the movement range of the plunger, so that the back dead point of the plunger can be moved forward into the pump body. The plunger channel is connected to a stuffing box, and the stuffing box is equipped with a plunger that can move laterally back and forth in the plunger channel. The guide pipe is located outside the movement range of the plunger.

2. A plunger slurry pump according to claim 1, characterized in that: The upper outer wall of the isolation ring is inclined towards the axis to form a conical surface.

3. A plunger slurry pump mechanism according to claim 2, characterized in that: A gap is provided between the outer wall of the isolation ring and the inner wall of the medium oscillation chamber.

4. A plunger slurry pump according to claim 3, characterized in that: Both the upper and lower elastic support components are springs.

5. A plunger slurry pump according to claim 1, characterized in that: The plunger channel runs horizontally through the pump body, and an end cap is connected to the other end of the plunger channel.

6. A plunger slurry pump according to claim 5, characterized in that: The dead center of the plunger during its reciprocating motion is located within the plunger channel.

7. A plunger slurry pump according to claim 6, characterized in that: The stuffing box is equipped with a backwashing port.

8. A plunger slurry pump according to claim 7, characterized in that: The medium oscillation chamber has an inner conical opening at the bottom of the pump body, and the bottom of the guide pipe is a cone with a portion of the cone extending into the inner conical opening. Multiple medium inlets are provided circumferentially on the side wall of the guide pipe above the cone.

9. A plunger slurry pump according to claim 8, characterized in that: An outlet valve assembly is connected to the top of the pump body, and the outlet valve assembly is connected to the top of the guide pipe. An inlet valve assembly is connected to the bottom of the pump body, and the inlet valve assembly is connected to the inner cone port.

Images