Hydraulic end of high-pressure slurry pump

Abstract

The invention belongs to the technical field of high-pressure plunger pumps, and discloses a high-pressure slurry pump fluid end which comprises a valve box, a stuffing box assembly, a liquid inlet and outlet valve set, a plunger and an oil injector. A plunger working cavity, a valve cavity, a liquid inlet and a liquid outlet are formed in the valve box, the plunger working cavity is communicated with the valve cavity, one end of the stuffing box assembly is connected with the valve box, the plunger is in sliding connection with a cavity in the stuffing box assembly, one end of the plunger extends into the plunger working cavity, and the liquid inlet and outlet valve set is arranged in the valve cavity. The two ends of the cooling water inlet pipe are communicated with a waterway inlet and a waterway outlet of the stuffing box assembly respectively. The slurry medium flows from top to bottom and is consistent with the deposition direction of abrasive particles due to gravity, so that the abrasive particles in the clearance volume are easily and smoothly discharged out of the pump; and the conditions that a flow channel is blocked and key parts are damaged due to deposition of abrasive particles in a traditional bottom-in and top-out type fluid end are avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-pressure plunger pump, and particularly relates to a high-pressure slurry pump liquid end. BACKGROUND

[0002] The high-pressure plunger pump is a core high-pressure water generating device in a high-pressure water jet system, and is mainly used for conveying clean water medium and providing high-pressure water meeting pressure requirements to a system nozzle. The existing high-pressure water jet system is mainly divided into three types according to different adding methods and mixing positions of abrasives, namely, a pure water jet system, a post-mixed abrasive water jet system and a pre-mixed abrasive water jet system. In the above three systems, the conveying medium of the high-pressure plunger pump is clean water, and the core difference lies in the adding time and mixing position of the abrasive: in the pure water jet system, the high-pressure water output by the high-pressure plunger pump is directly conveyed to the nozzle, and no abrasive is added throughout the system; in the post-mixed abrasive water jet system, the abrasive is injected into the high-pressure water jet by the water nozzle at the nozzle to complete the mixing, and the mixed abrasive water jet is sprayed through the sand nozzle; the pre-mixed abrasive water jet system mixes the abrasive with clean water in advance through a high-pressure sand mixing tank arranged on the output pipeline of the high-pressure plunger pump, and then the mixed medium is conveyed to the nozzle to form an abrasive water jet.

[0003] Different types of high-pressure water jet systems are suitable for different working conditions, and the corresponding required working pressure differs significantly: the pure water jet system is mainly used for object surface dirt cleaning, surface rust and paint removal and the like, and the working pressure ranges from several tens of MPa to 300 MPa, and if applied to composite material cutting, the working pressure needs to be increased to 500 MPa-600 MPa; the post-mixed abrasive water jet system can be used for cutting of materials such as stone and metal plate due to the cutting action of the abrasive, and the working pressure can be greatly reduced to 200 MPa-300 MPa; in the pre-mixed abrasive water jet system, the abrasive is mixed with clean water earlier, and the abrasive particles accelerate more fully in the medium, and when the same cutting effect as the post-mixed abrasive water jet is achieved, the working pressure can be further reduced to several tens of MPa to 100 MPa.

[0004] However, pre-mixed abrasive waterjet systems have inherent drawbacks: the high-pressure mixing tank used is a high-pressure vessel, and due to the high-pressure operating conditions, the tank's volume cannot be too large, making it difficult to achieve a continuous and stable supply of abrasive, thus failing to meet the requirements of long-term continuous operation scenarios such as waterjet mining. In waterjet mining applications such as cutting and crushing rocks, the system needs to have high-pressure and high-flow-rate characteristics, typically requiring an operating pressure of around 100 MPa and a flow rate of no less than 100 L / min. For such operating conditions, the most ideal technical solution is to achieve abrasive and water mixing at the inlet end of the high-pressure plunger pump, allowing the high-pressure plunger pump to directly deliver the slurry medium containing abrasive particles. This solution allows for more uniform mixing of abrasive and water, more complete acceleration of abrasive particles during transportation, and the resulting abrasive waterjet with optimal cutting capability. However, this technical solution places special requirements on the structural design of the high-pressure slurry pump: due to the tendency of abrasive particles to deposit, the pump's hydraulic end must simultaneously possess core properties such as anti-deposition, high-pressure resistance, and wear resistance to ensure reliable operation of the pump under these conditions.

[0005] The high-pressure slurry pump mainly consists of two parts: a power end and a hydraulic end. The core function of the power end is to convert the rotational power output from the drive motor into the reciprocating linear motion of a slider after reduction. At the connection between the power end and the hydraulic end, the slider is connected to the plunger of the hydraulic end through a plunger connection structure, thereby transmitting power to the plunger. The plunger of the hydraulic end, through reciprocating motion, coordinates with the alternating opening and closing of the inlet valve and the outlet valve to achieve the intake and discharge of the slurry medium. It should be noted that the hydraulic end, as a key flow component that directly contacts and transports the mixture containing easily depositing abrasive particles, requires specific optimization of its structural design to suit the characteristics of the slurry medium.

[0006] Existing high-pressure plunger pumps generally employ a bottom-in, top-out media flow structure on their hydraulic end. This means the inlet is located below the valve chamber, and the outlet is located above, with the medium flowing upwards within the valve chamber. Because a certain clearance volume inevitably exists within the valve chamber, when this structure is used to transport slurry media, abrasive particles tend to gradually accumulate within this clearance volume. This not only easily causes valve chamber blockage but also accelerates valve wear and can even lead to valve core jamming, severely impacting the pump's operational reliability.

[0007] Meanwhile, the existing high-pressure plunger pump inlet and outlet valve assemblies also have compatibility defects: most existing valve assemblies use flat or conical valves, with the valve cores located above the valve seat and equipped with springs for valve core reset; some solutions use ball valve structures, with the valve ball also located above the valve seat, usually without springs, relying on the valve ball's own weight to achieve reset. When conveying slurry media, the valve core and seat sealing surfaces of a flat valve are easily scratched and worn by abrasive particles, leading to sealing failure. Compared with flat valves, cone valves have better media flow and the problem of sealing surface wear is somewhat improved. However, it is usually necessary to add a sealing gasket at the valve core or seat sealing surface. In working conditions such as rock cutting, the slurry pressure can reach about 100MPa. High-pressure slurry can easily damage the sealing gasket. If a sealing gasket is not added, the sealing performance cannot be guaranteed. The ball valve has a line contact seal between the valve ball and the valve seat, which has a certain resistance to abrasive particles and can be adapted to the conveying of slurry media. However, if a structural layout in which the valve ball is located below the valve seat is adopted, the valve ball will not be able to return to its original position by its own weight, resulting in the failure of the valve assembly.

[0008] In summary, the existing hydraulic end structure and inlet / outlet valve assembly design of high-pressure plunger pumps are unsuitable for high-pressure, high-flow-rate conveying conditions containing easily depositing abrasive mixtures, making it difficult to meet the reliable operation requirements of high-pressure slurry pumps in high-pressure, high-flow-rate water jet rock breaking applications. Therefore, developing a hydraulic end structure with anti-abrasive particle deposition, high-pressure resistance, and wear resistance characteristics to adapt to pressurized conveying conditions containing easily depositing abrasive mixtures has become a key technological bottleneck for the widespread application of high-pressure slurry pumps in water jet mining and other fields. Summary of the Invention

[0009] To address the above problems, the present invention provides a hydraulic end of a high-pressure slurry pump, including a valve box, a stuffing box assembly, an inlet and outlet valve group, a plunger, and an oil injector; The valve box is equipped with a plunger working chamber, a valve chamber, an inlet, and an outlet. The valve chamber is arranged vertically along the valve box. The inlet is located above the valve chamber, and the outlet is located below the valve chamber. Both the inlet and outlet are connected to the valve chamber. The plunger working chamber is connected to the valve chamber and is located between the inlet and outlet. One end of the stuffing box assembly is connected to the valve box, and the other end of the stuffing box assembly extends horizontally away from the valve box. The plunger is slidably connected to the cavity inside the stuffing box assembly, and one end of the plunger extends into the plunger working chamber. The plunger reciprocates within the cavity inside the stuffing box assembly and the plunger working chamber. The inlet and outlet valve assembly is located inside the valve chamber. The oil injector is connected to the oil circuit of the stuffing box assembly through the oil injection pipe. One end of the cooling water inlet pipe is connected to the water inlet of the stuffing box assembly, and one end of the cooling water return pipe is connected to the water outlet of the stuffing box assembly.

[0010] Furthermore, the inlet and outlet valve assembly includes an inlet valve seat, an inlet valve ball, an inlet valve spring, an outlet valve seat, an outlet valve ball, and an outlet valve spring; The bottom of the inlet valve seat is connected to the top of the outlet valve seat. The inlet valve seat has an inlet channel in the vertical direction, and the outlet valve seat has an outlet channel in the vertical direction. A first spring seat is provided at the bottom of the inlet valve seat. The inlet valve spring is located in the inlet channel. The bottom of the inlet valve spring is fixedly connected to the first spring seat. The inlet valve ball is located in the inlet channel. The top of the inlet valve spring abuts against the inlet valve ball. The inlet valve ball blocks the inlet channel under the action of the inlet valve spring. A second spring seat is provided at the bottom of the drain valve seat. The drain valve spring is located in the drain channel. The bottom of the drain valve spring is fixedly connected to the second spring seat. The drain valve ball is located in the drain channel. The top of the drain valve spring abuts against the drain valve ball. The drain valve ball blocks the drain channel under the action of the drain valve spring.

[0011] Furthermore, the inner diameter of both the inlet channel and the outlet channel gradually increases from top to bottom.

[0012] Furthermore, the upper part of the inlet valve seat is provided with a plurality of first inlet holes along the circumferential direction. Each first inlet hole extends radially along the inlet valve seat, and the two ends of the first inlet hole are respectively connected to the plunger working chamber and the inlet channel. The inlet valve seat is provided with a plurality of second inlet holes along the circumferential direction at the position of the first spring seat. Each second inlet hole extends radially along the inlet valve seat, and the two ends of each second inlet hole are respectively connected to the inlet channel and the plunger working chamber.

[0013] Furthermore, the first spring seat is provided with multiple flow holes along the circumference, one end of each flow hole is connected to the liquid inlet channel, and the other end of each flow hole is connected to the liquid outlet channel; The upper part of the drain valve seat is provided with a plurality of first drain holes along the circumference. Each first drain hole extends radially along the drain valve seat. There is an annular cavity between the outer wall surface of the drain valve seat below the first drain hole and the inner wall surface of the valve cavity. The two ends of the first drain hole are respectively connected to the annular cavity and the drain channel. The drain valve seat is provided with a plurality of second drain holes along the circumference at the position of the drain port. Each second drain hole extends radially along the drain valve seat. The two ends of each second drain hole are respectively connected to the annular cavity and the drain channel. The annular cavity is also connected to the drain port.

[0014] Furthermore, the inlet valve ball and the inlet valve seat, as well as the drain valve ball and the drain valve seat, are both line seals.

[0015] Furthermore, the stuffing box assembly includes a stuffing box body, in which, starting from the end closest to the valve box, a fixed spring seat, a high-pressure sealing spring, a sealing sleeve, a particle interception ring, a spacer ring, a primary high-pressure seal, an oil isolation ring, a secondary high-pressure seal, and a guide sleeve are sequentially arranged on the outer periphery of the plunger. The stuffing box assembly also includes a cover, which is fixed to the end of the stuffing box body away from the valve box, and the cover presses the guide sleeve into the stuffing box body.

[0016] Furthermore, one end of the oil injection pipe is connected to the oil injector, and the other end of the oil injection pipe passes through the stuffing box and is connected to the cavity of the oil isolation ring.

[0017] Furthermore, a slag discharge hole is also provided inside the valve box. The slag discharge hole is located below the working chamber of the plunger. One end of the slag discharge hole is connected to the liquid inlet channel, and the other end of the slag discharge hole is connected to the cavity near the fixed spring seat.

[0018] Furthermore, the cover is provided with an annular cooling groove, and a low-pressure sealing element and a low-pressure sealing spring are provided in the annular cooling groove. The low-pressure sealing element and the low-pressure sealing spring are sleeved on the outer periphery of the plunger. One end of the low-pressure sealing spring abuts against the guide sleeve, and the other end of the low-pressure sealing spring abuts against the low-pressure sealing element. One end of the cooling water inlet pipe passes through the cover and is connected to the water inlet of the annular cooling groove, and one end of the cooling water return pipe passes through the cover and is connected to the water outlet of the annular cooling groove.

[0019] The beneficial effects of this invention are: 1. In this invention, the valve chamber in the hydraulic end is arranged vertically along the valve box, the inlet is located above the valve chamber, the outlet is located below the valve chamber, and the inlet and outlet valve assembly is located inside the valve chamber. This ensures that the slurry medium flows from top to bottom, which is consistent with the direction of abrasive particle deposition due to gravity. This facilitates the smooth discharge of abrasive particles from the clearance volume, avoiding the flow channel blockage and damage to key components caused by abrasive particle deposition that occurs with traditional bottom-inlet, top-outlet hydraulic ends. This invention is suitable for high-pressure, high-flow-rate conveying conditions containing easily depositing abrasive mixtures and can meet the reliable operation requirements of high-pressure slurry pumps in the field of high-pressure, high-flow-rate water jet rock breaking.

[0020] 2. The inlet and outlet valve structure of the present invention is an inverted spring ball valve, which is different from the traditional weight-bearing ball valve without spring. The top of the inlet valve spring abuts against the inlet valve ball, and the inlet valve ball blocks the inlet channel under the action of the inlet valve spring. The top of the outlet valve spring abuts against the outlet valve ball, and the outlet valve ball blocks the outlet channel under the action of the outlet valve spring. The restoring force of the inlet and outlet valve assembly when closed is upward, so that the medium inside the valve flows from top to bottom. It is easy to open automatically when inlet and can be quickly and reliably closed when outlet by the action of spring force.

[0021] 3. The inlet valve ball and the inlet valve seat of the present invention, as well as the outlet valve ball and the outlet valve seat, are both line seals. Abrasive particles are not easily stuck on the sealing surface, which may cause poor sealing. Moreover, the valve ball can rotate freely and automatically clean the abrasive particles that may be deposited on the surface. Therefore, it is suitable for conveying slurry media containing easily deposited abrasive particles.

[0022] 4. The stuffing box assembly of the present invention features a sealing ring for interception, an oil injection isolation system, and a cooling water system, making it difficult for abrasive particles to enter the high-pressure seal. Furthermore, due to the injection of lubricating oil and cooling water, even when the medium contains easily deposited abrasive particles, the high-pressure seal remains in good working condition, extending the service life of the seal and improving the reliability of the pump.

[0023] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the hydraulic end of a high-pressure slurry pump according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a valve box structure according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the inlet and outlet valve assembly structure according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the internal flow channel of the inlet and outlet valve assembly according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the stuffing box assembly structure according to an embodiment of the present invention is shown.

[0026] In the diagram: 1. Valve box; 2. Stuffing gland assembly; 3. Inlet / outlet valve group; 4. Plunger; 5. Oil injector; 6. Oil injection pipe; 7. Cooling water inlet pipe; 8. Cooling water return pipe; 11. Plunger working chamber; 12. Valve chamber; 13. Liquid inlet; 14. Liquid outlet; 15. Slag discharge hole; 21. Stuffing gland body; 22. Gland cover; 211. Fixed spring seat; 212. High-pressure sealing spring; 213. Sealing sleeve; 214. Particle interception ring; 215. Spacer ring; 216. Primary high-pressure seal; 217. Oil isolation ring; 218. Secondary high-pressure seal; 219. High-pressure seal; 221. Guide sleeve; 222. Cooling tank; 223. Low-pressure seal; 224. Low-pressure sealing spring; 31. Inlet valve seat; 32. Inlet valve ball; 33. Inlet valve spring; 34. Drain valve seat; 35. Drain valve ball; 36. Drain valve spring; 311. Inlet channel; 312. First spring seat; 313. First inlet hole; 314. Second inlet hole; 341. Drain channel; 342. Second spring seat; 343. Flow hole; 344. First drain hole; 345. Second drain hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0029] This invention provides a hydraulic end for a high-pressure slurry pump, employing technologies such as a structure to prevent abrasive particle deposition, a seal to prevent abrasive particles from entering the high-pressure seal, and an inverted spring ball valve. These measures address the adverse effects of high-pressure slurry media on the pump, enabling reliable operation of a high-pressure slurry pump suitable for pressurized conveying of mixtures containing easily deposited and decaying liquids.

[0030] like Figure 1 As shown, a hydraulic end of a high-pressure slurry pump includes a valve box 1, a stuffing box assembly 2, an inlet and outlet valve group 3, a plunger 4, and an oil injector 5.

[0031] like Figure 2 As shown, the valve box 1 is provided with a plunger working chamber 11, a valve chamber 12, an inlet 13, and an outlet 14. The valve chamber 12 is arranged vertically along the valve box 1. The inlet 13 is located above the valve chamber 12, and the outlet 14 is located below the valve chamber 12. Both the inlet 13 and the outlet 14 are connected to the valve chamber 12, so that the flow direction of the slurry medium is from top to bottom, which is consistent with the direction of abrasive particles deposition due to gravity, making it easy for abrasive particles in the clearance volume to be smoothly discharged out of the pump.

[0032] The plunger working chamber 11 is arranged in a horizontal direction and is connected to the valve chamber 12. The plunger working chamber 11 is located between the liquid inlet 13 and the liquid outlet 14. For example, both the liquid inlet 13 and the liquid outlet 14 are arranged in a horizontal direction.

[0033] One end of the stuffing box assembly 2 is connected to the valve box 1, and the other end of the stuffing box assembly 2 extends horizontally away from the valve box 1. The plunger 4 is slidably connected to the cavity inside the stuffing box assembly 2. One end of the plunger 4 extends into the plunger working chamber 11. The plunger 4 reciprocates in the cavity inside the stuffing box assembly 2 and the plunger working chamber 11. The inlet and outlet valve group 3 is set in the valve chamber 12.

[0034] The oil injector 5 is connected to the oil circuit of the stuffing box assembly 2 through the oil injection pipe 6, and the oil injector 5 injects lubricating oil into the stuffing box assembly 2 through the oil injection pipe 6; one end of the cooling water inlet pipe 7 is connected to the water inlet of the stuffing box assembly 2, and one end of the cooling water return pipe 8 is connected to the water outlet of the stuffing box assembly 2. Cooling water enters the stuffing box assembly 2 from the cooling water inlet pipe 7 and returns to the water source from the cooling water return pipe 8.

[0035] like Figure 3 As shown, for example, the inlet and outlet valve assembly 3 includes an inlet valve seat 31, an inlet valve ball 32, an inlet valve spring 33, an outlet valve seat 34, an outlet valve ball 35, and an outlet valve spring 36.

[0036] The bottom of the inlet valve seat 31 is connected to the top of the outlet valve seat 34. The inlet valve seat 31 has an inlet channel 311 along the vertical direction, and the inner diameter of the inlet channel 311 gradually increases from top to bottom. The outlet valve seat 34 has an outlet channel 341 along the vertical direction, and the inner diameter of the outlet channel 341 gradually increases from top to bottom.

[0037] The bottom of the inlet valve seat 31 is provided with a first spring seat 312, the inlet valve spring 33 is provided in the inlet channel 311, the bottom of the inlet valve spring 33 is fixedly connected to the first spring seat 312, the inlet valve ball 32 is provided in the inlet channel 311, the top of the inlet valve spring 33 abuts against the inlet valve ball 32, and the inlet valve ball 32 blocks the inlet channel 311 under the action of the inlet valve spring 33.

[0038] like Figure 4 As shown, the upper part of the inlet valve seat 31 is provided with a plurality of first inlet holes 313 along the circumferential direction. Each first inlet hole 313 extends radially along the inlet valve seat 31, and the two ends of the first inlet hole 313 are respectively connected to the plunger working chamber 11 and the inlet channel 311. The inlet valve seat 31 is provided with a plurality of second inlet holes 314 along the circumferential direction at the position of the first spring seat 312. Each second inlet hole 314 extends radially along the inlet valve seat 31, and the two ends of each second inlet hole 314 are respectively connected to the inlet channel 311 and the plunger working chamber 11.

[0039] The first spring seat 312 is provided with a plurality of flow holes 343 along the circumference. One end of each flow hole 343 is connected to the liquid inlet channel 311, and the other end of each flow hole 343 is connected to the liquid outlet channel 341.

[0040] A second spring seat 342 is provided at the bottom of the drain valve seat 34. The drain valve spring 36 is provided in the drain channel 341. The bottom of the drain valve spring 36 is fixedly connected to the second spring seat 342. The drain valve ball 35 is provided in the drain channel 341. The top of the drain valve spring 36 abuts against the drain valve ball 35. The drain valve ball 35 blocks the drain channel 341 under the action of the drain valve spring 36.

[0041] The upper part of the drain valve seat 34 is provided with a plurality of first drain holes 344 along the circumferential direction. Each first drain hole 344 extends radially along the drain valve seat 34. The drain valve seat 34 has an annular cavity between the outer wall surface below the first drain hole 344 and the inner wall surface of the valve cavity 12. The two ends of the first drain hole 344 are respectively connected to the annular cavity and the drain channel 341. The drain valve seat 34 is provided with a plurality of second drain holes 345 along the circumferential direction at the position of the drain port 14. Each second drain hole 345 extends radially along the drain valve seat 34. The two ends of each second drain hole 345 are respectively connected to the annular cavity and the drain channel 341. The annular cavity is also connected to the drain port 14.

[0042] The working principle of the hydraulic end of the high-pressure slurry pump in this embodiment of the invention is as follows: the plunger 4 slides away from the valve box 1 under the drive of external force. The slurry enters from the inlet 13, flows through the valve chamber 12 and then into the inlet channel 311. The inlet valve ball 32 compresses the inlet valve spring 33 downward under the pressure of the slurry. The first inlet hole 313 is connected to the plunger working chamber 11. The slurry enters the plunger working chamber 11 through the first inlet hole 313, thus completing the slurry feeding.

[0043] Driven by external force, the plunger 4 slides towards the valve box 1. The inlet valve spring 33 pushes the inlet valve ball 32 upward, and the inlet channel 311 is closed. The slurry in the plunger working chamber 11 flows through the second inlet hole 314, the flow hole 343, and the first drain hole 344 in sequence under the action of the plunger 4, and then enters the top of the drain channel 341. The drain valve ball 35 compresses the drain valve spring 36 downward under the pressure of the slurry. The first drain hole 344 is connected to the annular cavity. The slurry enters the annular cavity from the first drain hole 344 and then flows out from the drain port 14.

[0044] In the next cycle, as the plunger 4 slides away from the valve box 1, the drain valve spring 36 pushes the drain valve ball 35 upward, and the drain passage 341 is closed.

[0045] In this embodiment of the invention, the inlet valve spring 33 is located below the inlet valve ball 32, and the drain valve spring 36 is located below the drain valve ball 35. The restoring force of the valve closing is upward, so that the medium inside the valve flows from top to bottom. It is easy to open automatically when liquid is introduced, and can be quickly and reliably closed by the action of the spring force when liquid is drained.

[0046] In this embodiment of the invention, the slurry medium in the hydraulic end flows from top to bottom, which is consistent with the direction of abrasive particle deposition due to gravity. This makes it easy for the abrasive particles in the clearance volume to be discharged smoothly out of the pump, avoiding the flow channel blockage and damage to key components caused by abrasive particle deposition in the traditional bottom-inlet, top-outlet hydraulic end.

[0047] For example, the inlet valve ball 32 and the inlet valve seat 31, as well as the drain valve ball 35 and the drain valve seat 34, are both line seals. Abrasive particles are not easily stuck on the sealing surface, which would cause poor sealing. Moreover, the inlet valve ball 32 and the drain valve ball 35 can rotate freely and automatically clean any abrasive particles that may be deposited on the surface. Therefore, they are suitable for conveying slurry media containing easily deposited abrasive particles.

[0048] like Figure 5 As shown, for example, the stuffing box assembly 2 includes a stuffing box body 21. Inside the stuffing box body 21, starting from the end near the valve box 1, along the direction of the plunger 4 extending outward, are arranged in sequence a fixed spring seat 211, a high-pressure sealing spring 212, a sealing sleeve 213, a particle interception ring 214, a spacer ring 215, a primary high-pressure seal 216, an oil isolation ring 217, a secondary high-pressure seal 218, and a guide sleeve 219.

[0049] The stuffing box assembly 2 also includes a cover 22, which is fixed to the end of the stuffing box body 21 away from the valve box 1 by bolts. The cover 22 presses the guide sleeve 219 into the stuffing box body 21.

[0050] For example, one end of the oil injection pipe 6 is connected to the oil injector 5, and the other end of the oil injection pipe 6 passes through the stuffing box 21 and is connected to the cavity of the oil isolation ring 217 to achieve lubrication, cooling and isolation.

[0051] For example, a slag discharge hole 15 is also provided in the valve box 1. The slag discharge hole 15 is arranged in the horizontal direction and is located below the plunger working chamber 11. One end of the slag discharge hole 15 is connected to the liquid inlet channel 311, and the other end of the slag discharge hole 15 is connected to the cavity near the fixed spring seat 211. The function of the slag discharge hole 15 is to circulate the abrasive particles deposited in the lower space of the stuffing box assembly 2 back to the valve box 1.

[0052] For example, an annular cooling groove 221 is provided inside the cover 22. A low-pressure seal 222 and a low-pressure sealing spring 223 are provided inside the annular cooling groove 221. The low-pressure seal 222 and the low-pressure sealing spring 223 are sleeved on the outer periphery of the plunger 4. One end of the low-pressure sealing spring 223 abuts against the guide sleeve 219, and the other end of the low-pressure sealing spring 223 abuts against the low-pressure seal 222. One end of the cooling water inlet pipe 7 passes through the cover 22 and is connected to the inlet of the annular cooling groove 221. One end of the cooling water return pipe 8 passes through the cover 22 and is connected to the outlet of the annular cooling groove 221.

[0053] The stuffing box assembly 2 of this invention adopts a comprehensive technical measure of sealing ring interception, oil injection isolation and cooling water system, which makes it difficult for abrasive particles to enter the high-pressure seal. Due to the injection of lubricating oil and cooling water, even when there are easily deposited abrasive particles in the medium, the high-pressure seal is in good working condition, which extends the service life of the seal and improves the reliability of the pump.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic end for a high-pressure slurry pump, characterized in that, Includes valve box (1), stuffing box assembly (2), inlet and outlet valve group (3), plunger (4) and oil injector (5); The valve box (1) is provided with a plunger working chamber (11), a valve chamber (12), an inlet (13) and an outlet (14). The valve chamber (12) is arranged vertically along the valve box (1). The inlet (13) is located above the valve chamber (12). The outlet (14) is located below the valve chamber (12). Both the inlet (13) and the outlet (14) are connected to the valve chamber (12). The plunger working chamber (11) is connected to the valve chamber (12). The plunger working chamber (11) is located between the inlet (13) and the outlet (14). One end of the stuffing box assembly (2) is connected to the valve box (1). The other end of the stuffing box assembly (2) extends horizontally away from the valve box (1). The plunger (4) is slidably connected to the cavity inside the stuffing box assembly (2). One end of the plunger (4) extends to the plunger working chamber. Inside the cavity (11), the plunger (4) reciprocates within the cavity of the stuffing box assembly (2) and within the working chamber (11) of the plunger. The inlet and outlet valve group (3) is located in the valve chamber (12). The oil injector (5) is connected to the oil circuit of the stuffing box assembly (2) through the oil injection pipe (6). One end of the cooling water inlet pipe (7) is connected to the water inlet of the stuffing box assembly (2), and one end of the cooling water return pipe (8) is connected to the water outlet of the stuffing box assembly (2).

2. The hydraulic end of the high-pressure slurry pump according to claim 1, characterized in that, The inlet and outlet valve assembly (3) includes an inlet valve seat (31), an inlet valve ball (32), an inlet valve spring (33), an outlet valve seat (34), an outlet valve ball (35), and an outlet valve spring (36). The bottom of the inlet valve seat (31) is connected to the top of the outlet valve seat (34). The inlet valve seat (31) has an inlet channel (311) in the vertical direction, and the outlet valve seat (34) has an outlet channel (341) in the vertical direction. The bottom of the inlet valve seat (31) is provided with a first spring seat (312). The inlet valve spring (33) is provided in the inlet channel (311). The bottom of the inlet valve spring (33) is fixedly connected to the first spring seat (312). The inlet valve ball (32) is provided in the inlet channel (311). The top of the inlet valve spring (33) abuts against the inlet valve ball (32). The inlet valve ball (32) blocks the inlet channel (311) under the action of the inlet valve spring (33). The bottom of the drain valve seat (34) is provided with a second spring seat (342), the drain valve spring (36) is provided in the drain channel (341), the bottom of the drain valve spring (36) is fixedly connected to the second spring seat (342), the drain valve ball (35) is provided in the drain channel (341), the top of the drain valve spring (36) abuts against the drain valve ball (35), and the drain valve ball (35) blocks the drain channel (341) under the action of the drain valve spring (36).

3. The hydraulic end of the high-pressure slurry pump according to claim 2, characterized in that, The inner diameter of the liquid inlet channel (311) and the inner diameter of the liquid outlet channel (341) both gradually increase from top to bottom.

4. The hydraulic end of the high-pressure slurry pump according to claim 2, characterized in that, The upper part of the liquid inlet valve seat (31) is provided with a plurality of first liquid inlet holes (313) along the circumferential direction. Each first liquid inlet hole (313) extends radially along the liquid inlet valve seat (31), and the two ends of the first liquid inlet hole (313) are respectively connected to the plunger working chamber (11) and the liquid inlet channel (311). The liquid inlet valve seat (31) is provided with a plurality of second liquid inlet holes (314) along the circumferential direction at the position of the first spring seat (312). Each second liquid inlet hole (314) extends radially along the liquid inlet valve seat (31), and the two ends of each second liquid inlet hole (314) are respectively connected to the liquid inlet channel (311) and the plunger working chamber (11).

5. The hydraulic end of the high-pressure slurry pump according to claim 4, characterized in that, The first spring seat (312) is provided with a plurality of flow holes (343) in the circumferential direction. One end of each flow hole (343) is connected to the liquid inlet channel (311), and the other end of each flow hole (343) is connected to the liquid outlet channel (341). The upper part of the drain valve seat (34) is provided with a plurality of first drain holes (344) along the circumferential direction. Each first drain hole (344) extends radially along the drain valve seat (34). The drain valve seat (34) has an annular cavity between the outer wall surface below the first drain hole (344) and the inner wall surface of the valve cavity (12). The two ends of the first drain hole (344) are respectively connected to the annular cavity and the drain channel (341). The drain valve seat (34) is provided with a plurality of second drain holes (345) along the circumferential direction at the position of the drain port (14). Each second drain hole (345) extends radially along the drain valve seat (34). The two ends of each second drain hole (345) are respectively connected to the annular cavity and the drain channel (341). The annular cavity is also connected to the drain port (14).

6. The hydraulic end of the high-pressure slurry pump according to any one of claims 2-5, characterized in that, The inlet valve ball (32) and the inlet valve seat (31), as well as the drain valve ball (35) and the drain valve seat (34), are both line seals.

7. The hydraulic end of the high-pressure slurry pump according to claim 5, characterized in that, The stuffing box assembly (2) includes a stuffing box body (21). Inside the stuffing box body (21), starting from the end near the valve box (1) and extending outward from the plunger (4), a fixed spring seat (211), a high-pressure sealing spring (212), a sealing sleeve (213), a particle interception ring (214), a spacer ring (215), a primary high-pressure seal (216), an oil isolation ring (217), a secondary high-pressure seal (218), and a guide sleeve (219) are arranged in sequence. The stuffing box assembly (2) also includes a cover (22). The cover (22) is fixed at the end of the stuffing box body (21) away from the valve box (1). The cover (22) presses the guide sleeve (219) into the stuffing box body (21).

8. The hydraulic end of the high-pressure slurry pump according to claim 7, characterized in that, One end of the oil injection pipe (6) is connected to the oil injector (5), and the other end of the oil injection pipe (6) passes through the stuffing box (21) and is connected to the cavity of the oil isolation ring (217).

9. The hydraulic end of the high-pressure slurry pump according to claim 7, characterized in that, The valve box (1) is also provided with a slag discharge hole (15), which is located below the plunger working chamber (11). One end of the slag discharge hole (15) is connected to the liquid inlet channel (311), and the other end of the slag discharge hole (15) is connected to the cavity near the fixed spring seat (211).

10. The hydraulic end of the high-pressure slurry pump according to any one of claims 7-9, characterized in that, The cover (22) is provided with an annular cooling groove (221). The annular cooling groove (221) is provided with a low-pressure seal (222) and a low-pressure sealing spring (223). The low-pressure seal (222) and the low-pressure sealing spring (223) are sleeved on the outer periphery of the plunger (4). One end of the low-pressure sealing spring (223) abuts against the guide sleeve (219), and the other end of the low-pressure sealing spring (223) abuts against the low-pressure seal (222). One end of the cooling water inlet pipe (7) passes through the cover (22) and communicates with the inlet of the annular cooling groove (221). One end of the cooling water return pipe (8) passes through the cover (22) and communicates with the outlet of the annular cooling groove (221).

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