Reciprocating pump fluid end

Abstract

The utility model relates to a fluid end of a reciprocating pump, which belongs to the technical field of reciprocating pumps and comprises a pump body, a pump top fixedly mounted at the top end of the pump body, a pump cover arranged at the bottom end of the pump body, a piston rod slidably connected inside the pump body, a pump cavity arranged inside the pump body, and a piston body slidably connected inside the pump cavity. One end of the piston rod extends into the pump cavity and is fixedly connected with the piston body. The reciprocating pump has the advantages that the piston rod and the piston body in the pump body can be replaced independently through the replacement mechanism, the whole pump body does not need to be replaced, the part replacement cost is saved, meanwhile, abraded parts are replaced in time, the working efficiency of the reciprocating pump can be improved, and the service life of the reciprocating pump is prolonged through the buffer mechanism. When the piston rod and the piston body fall down in the pump cavity, an important buffering effect can be achieved, the impact of the piston body on the pump cover is reduced, the pump cover is not prone to breakage and abrasion, and the service life of the reciprocating pump is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of reciprocating pumps, in particular to a hydraulic end of a reciprocating pump. Background Art

[0002] A reciprocating pump is a positive displacement pump that transports liquid or pressurizes it by alternately increasing and decreasing the working volume in the cylinder. Existing high-pressure reciprocating pumps are generally three-plunger double-support radial pumps, including a housing, a crankshaft with three cranks, a transmission mechanism connected to the crankshaft to drive its rotation, a connecting rod, a plunger, and a suction and discharge valve group. When in use, the high-pressure reciprocating pump is driven by an electric motor, which is reduced by a coupling and a pair of helical cylindrical gears to drive the three-crank crankshaft to rotate, and then drives the plunger to reciprocate through the connecting rod slider, so that the working fluid is absorbed and the discharge valve group is inhaled and discharged, thereby converting electrical energy into hydraulic energy and outputting high-pressure liquid.

[0003] After searching, a Chinese patent discloses a shock-absorbing structure of the hydraulic end of a high-pressure reciprocating pump (authorization announcement number CN213116650U), which includes a pump body, wherein the upper and lower sides of the pump body are respectively fixedly connected with an output pipe and a suction pipe, a one-way ball valve is fixedly arranged between the connection between the output pipe, the suction pipe and the pump body structure, a limit block is fixedly arranged inside the one-way ball valve, one end of the pump body is fixedly connected with a pump cover, and the other end of the pump body is connected with a stuffing frame, a piston rod is penetrated in the middle of the stuffing frame, one end of the piston rod penetrates the interior of the pump body and is fixedly connected with a fixing frame, one side surface of the fixing frame is fixedly connected with a piston body, and the outer surface of the piston body is fixedly connected with a piston ring, although the piston rod of this patented technology is provided with a thick rod diameter and a large area of ​​the rod body connected to the piston body, which increases the fitting stability of the piston and the inner wall of the pump body, the setting of the stuffing frame ensures the service life, limits the piston rod, ensures the stability of the reciprocating movement of the piston rod, and reduces the vibration force of the pump body.

[0004] However, the above device still has some disadvantages in actual use. The most obvious one is that after the piston rod in the hydraulic end of the reciprocating pump has been active for a long time, it is easy to cause wear on the surface of the piston rod, which will reduce the working efficiency of the reciprocating pump. It is inconvenient to replace individual parts of the piston rod, and after the reciprocating motion of the piston rod, the piston body will collide with the pump cover. Over time, cracks and damage may occur on the inner wall of the pump cover, which greatly reduces the service life of the reciprocating pump. Utility Model Content

[0005] In view of the problems in the prior art: after the piston rod in the hydraulic end of the reciprocating pump has been active for a long time, it is easy to cause wear on the surface of the piston rod, which will reduce the working efficiency of the reciprocating pump. It is inconvenient to replace individual parts of the piston rod, and after the reciprocating motion of the piston rod, the piston body of the piston rod will collide with the pump cover. Over time, cracks and damage may occur on the inner wall of the pump cover, greatly reducing the service life of the reciprocating pump. The main purpose of the utility model is to provide a hydraulic end of a reciprocating pump.

[0006] The technical solution of the utility model is as follows: a reciprocating pump hydraulic end comprises a pump body, a pump top is fixedly mounted on the top end of the pump body, a pump cover is arranged at the bottom end of the pump body, a piston rod is slidably connected to the interior of the pump body, a pump cavity is opened inside the pump body, a piston body is slidably connected to the interior of the pump cavity, one end of the piston rod extends to the interior of the pump cavity and is fixedly connected to the piston body, a base is slidably connected to the interior of the pump cavity and located on one side of the piston body, cross bars are fixedly connected to both sides of the inner wall of the pump cover, a protective sleeve is fixedly connected to the outside of the pump body, a buffer mechanism is arranged inside the pump cover, and a replacement mechanism is arranged outside the pump body.

[0007] By adopting the above technical scheme and setting up the replacement mechanism, the piston rod and the piston body in the pump body can be replaced independently without replacing the entire pump body, thus saving the cost of parts replacement. At the same time, the worn parts can be replaced in time to improve the working efficiency of the reciprocating pump. The buffer mechanism can play an important buffering role when the piston rod and the piston body fall in the pump chamber, reducing the impact of the piston body on the pump cover, making the pump cover less prone to breakage and wear.

[0008] As a preferred embodiment, the buffer mechanism includes a damper fixedly installed between the pump cover and the base, the outer side of the cross bar is slidably connected with a buffer block, the outer side of the cross bar and between the buffer block and the inner wall of the pump cover are provided with a buffer spring, the buffer block is slidably connected to the inner wall of the pump cover, the top end of the buffer block is rotatably connected to a connecting rod, and the base is rotatably connected to an end of the connecting rod away from the buffer block.

[0009] By adopting the above technical solution and setting the damper, a certain buffering effect can be achieved on the impact force brought by the piston body. At this time, the connecting rod will push the buffer block to slide outside the corresponding cross bar under the squeezing of the base, thereby squeezing the buffer spring, so that the impact force is gradually reduced under the action of the buffer spring, thereby reducing the impact force on the pump cover.

[0010] As a preferred embodiment, the replacement mechanism includes an external thread arranged on the side of the pump body close to the pump cover, the inner wall of the pump cover is provided with an internal thread, the pump body is threadedly connected to the pump cover, both sides of the pump cover are fixedly connected with fixing plates, a screw rod passes through the fixing plate and the protective sleeve, both ends of the outer side of the screw rod are threadedly connected with fixing nuts, and the fixing nuts are in conflict with the outer side of the fixing plate.

[0011] By adopting the above technical solution, the pump body and the pump cover are threadedly connected, so that the pump cover can be separated from the pump body and installed on the pump body. The stability of the connection between the pump body and the pump cover is further improved by the coordinated use of the screw and the fixing nut.

[0012] As a preferred embodiment, the replacement mechanism further includes two hidden slots opened inside the piston body, bolts are arranged inside the hidden slots, and the piston body and the piston rod are connected by bolts.

[0013] By adopting the above technical solution, the impact of the exposed bolts and pump cover is reduced, and the disassembly and installation of the piston rod are facilitated.

[0014] As a preferred implementation, a sealing member with an annular structure is embedded in the outer bottom end of the pump body, and a sealing gasket with an annular structure is embedded in the inner wall of the pump cover, and the sealing gasket is in conflict with the sealing member.

[0015] By adopting the above technical solution, the sealing performance between the pump body and the pump cover can be improved to prevent the internal liquid from leaking.

[0016] As a preferred implementation, both sides of the pump body are fixedly connected with delivery pipes, and one-way ball valves are fixedly installed inside the delivery pipes.

[0017] By adopting the above technical solution and arranging the delivery pipe and the one-way ball valve, the normal use of the reciprocating pump is ensured.

[0018] As a preferred embodiment, wear-resistant rings used in conjunction with the piston rod are provided inside the pump body and the pump top.

[0019] By adopting the above technical solution, the wear of the piston rod can be reduced.

[0020] Compared with the prior art, the advantages and positive effects of the utility model are:

[0021] 1. In the utility model, when the piston rod and the piston body fall in the pump chamber, the impact force will be transmitted to the base, which can trigger the damper. Through the setting of the damper, it can play a certain buffering role on the impact force brought by the piston body. At this time, the connecting rod will push the buffer block to slide outside the corresponding cross bar under the squeezing of the base, thereby squeezing the buffer spring, so that the impact force is gradually reduced under the action of the buffer spring, and then the impact force on the pump cover can be reduced, thereby ensuring the long-term normal use of the reciprocating pump and further improving the service life of the reciprocating pump.

[0022] 2. In the utility model, the pump body and the pump cover are threadedly connected, so that the pump cover can be separated from the pump body and installed on the pump body. The stability of the connection between the pump body and the pump cover is further improved by the coordinated use of the screw and the fixing nut to ensure the normal use of the reciprocating pump. The bolts can be hidden by the setting of the hidden groove body to reduce the impact of the exposed bolts and the pump cover, and the piston rod can be disassembled and installed easily, so that the piston rod and the piston body in the pump body can be replaced independently without replacing the entire pump body, thus saving the cost of parts replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall three-dimensional diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0025] Figure 3 For this utility model Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 For this utility model Figure 2 Enlarged view of point B in the middle.

[0027] Legend: 1. Pump body; 2. Pump top; 3. Pump cover; 4. Piston rod; 5. Protective sleeve; 6. Wear-resistant ring; 7. Delivery pipe; 8. One-way ball valve; 9. Fixed plate; 10. Screw; 11. Fixing nut; 12. Base; 13. Damper; 14. Cross bar; 15. Connecting rod; 16. Buffer block; 17. Buffer spring; 18. Piston body; 19. Seal; 20. Gasket; 21. Hidden trough; 22. Bolt. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0029] Reference Figure 1-4 A reciprocating pump hydraulic end comprises a pump body 1, a pump top 2 is fixedly mounted on the top of the pump body 1, a pump cover 3 is arranged on the bottom of the pump body 1, a piston rod 4 is slidably connected to the inside of the pump body 1, a pump cavity is opened inside the pump body 1, a piston body 18 is slidably connected to the inside of the pump cavity, one end of the piston rod 4 extends to the inside of the pump cavity and is fixedly connected to the piston body 18, a base 12 is slidably connected to the inside of the pump cavity and located on one side of the piston body 18, cross bars 14 are fixedly connected to both sides of the inner wall of the pump cover 3, a protective sleeve 5 is fixedly connected to the outside of the pump body 1, a buffer mechanism is arranged inside the pump cover 3, and a replacement mechanism is arranged on the outside of the pump body 1.

[0030] During use, the replacement mechanism is provided so that the piston rod 4 and the piston body 18 in the pump body 1 can be replaced independently, without replacing the pump body 1 as a whole, thus saving the cost of parts replacement. At the same time, the worn parts can be replaced in time to improve the working efficiency of the reciprocating pump. The buffer mechanism can play an important buffering role when the piston rod 4 and the piston body 18 fall in the pump chamber, reducing the impact of the piston body 18 on the pump cover 3, making the pump cover 3 less prone to breakage and wear, and further improving the service life of the reciprocating pump.

[0031] Reference Figure 3 The buffer mechanism includes a damper 13 fixedly installed between the pump cover 3 and the base 12, and the outer side of the cross bar 14 is slidably connected with a buffer block 16. The outer side of the cross bar 14 and between the buffer block 16 and the inner wall of the pump cover 3 are provided with a buffer spring 17. The buffer block 16 is slidably connected to the inner wall of the pump cover 3, and the top of the buffer block 16 is rotatably connected to the connecting rod 15, and the base 12 is rotatably connected to the end of the connecting rod 15 away from the buffer block 16.

[0032] When the piston rod 4 and the piston body 18 fall in the pump chamber, the impact force will be transmitted to the base 12, which can trigger the damper 13. Through the setting of the damper 13, it can play a certain buffering role on the impact force brought by the piston body 18. At this time, the connecting rod 15 will push the buffer block 16 to slide outside the corresponding cross bar 14 under the squeezing of the base 12, thereby squeezing the buffer spring 17, so that the impact force is gradually reduced under the action of the buffer spring 17, thereby reducing the impact force on the pump cover 3, thereby ensuring the long-term normal use of the reciprocating pump.

[0033] Reference Figure 3 The replacement mechanism includes an external thread arranged on the side of the pump body 1 close to the pump cover 3, the inner wall of the pump cover 3 is provided with an internal thread, the pump body 1 is threadedly connected to the pump cover 3, both sides of the pump cover 3 are fixedly connected with fixing plates 9, a screw 10 passes through the fixing plate 9 and the protective sleeve 5, and both ends of the outer side of the screw 10 are threadedly connected with fixing nuts 11, and the fixing nuts 11 are in conflict with the outer side of the fixing plate 9.

[0034] When in use, the pump body 1 is threadedly connected to the pump cover 3 to facilitate separation of the pump cover 3 from the pump body 1 and installation of the pump cover 3 on the pump body 1. The screw 10 and the fixing nut 11 are used in combination to further improve the stability of the connection between the pump body 1 and the pump cover 3 to ensure the normal use of the reciprocating pump.

[0035] Reference Figure 3 The replacement mechanism also includes two hidden grooves 21 opened inside the piston body 18. Bolts 22 are arranged inside the hidden grooves 21. The piston body 18 and the piston rod 4 are connected by the bolts 22.

[0036] When in use, the bolts 22 can be hidden by the setting of the hidden groove body 21, reducing the impact of the exposed bolts 22 and the pump cover 3, and facilitating the disassembly and installation of the piston rod 4.

[0037] Reference Figure 3 A sealing member 19 with an annular structure is embedded in the outer bottom end of the pump body 1 , and a sealing gasket 20 with an annular structure is embedded in the inner wall of the pump cover 3 , and the sealing gasket 20 conflicts with the sealing member 19 .

[0038] By using the seal 19 and the sealing gasket 20 in coordination, the sealing performance between the pump body 1 and the pump cover 3 can be improved to prevent the internal liquid from leaking.

[0039] Reference Figure 2 Both sides of the pump body 1 are fixedly connected with a delivery pipe 7, and a one-way ball valve 8 is fixedly installed inside the delivery pipe 7. The arrangement of the delivery pipe 7 and the one-way ball valve 8 ensures the normal use of the reciprocating pump.

[0040] Reference Figure 1 The pump body 1 and the pump top 2 are both provided with wear-resistant rings 6 used in conjunction with the piston rod 4 to reduce the wear of the piston rod 4.

[0041] Working principle: First, when the piston rod 4 and the piston body 18 fall in the pump chamber, the impact force will be transmitted to the base 12, which can trigger the damper 13. Through the setting of the damper 13, the impact force brought by the piston body 18 can be buffered to a certain extent. At this time, the connecting rod 15 will push the buffer block 16 to slide outside the corresponding cross bar 14 under the squeezing of the base 12, thereby squeezing the buffer spring 17, so that the impact force is gradually reduced under the action of the buffer spring 17, thereby reducing the impact force on the pump cover 3. , thereby ensuring the normal use of the reciprocating pump for a long time, and through the pump body 1 and the pump cover 3 being threadedly connected, it is convenient to separate the pump cover 3 from the pump body 1, and at the same time it is convenient to install the pump cover 3 on the pump body 1, and through the coordinated use of the screw 10 and the fixing nut 11, the stability of the connection between the pump body 1 and the pump cover 3 is further improved to ensure the normal use of the reciprocating pump, and through the setting of the hidden groove body 21, the bolt 22 can be hidden, reducing the impact of the exposed bolt 22 and the pump cover 3, and facilitating the disassembly and installation of the piston rod 4.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A reciprocating pump hydraulic end, comprising a pump body (1), characterized in that: A pump top (2) is fixedly mounted on the top of the pump body (1), a pump cover (3) is arranged at the bottom of the pump body (1), a piston rod (4) is slidably connected to the inside of the pump body (1), a pump chamber is opened inside the pump body (1), a piston body (18) is slidably connected to the inside of the pump chamber, one end of the piston rod (4) extends into the inside of the pump chamber and is fixedly connected to the piston body (18), a base (12) is slidably connected to the inside of the pump chamber and located on one side of the piston body (18), cross bars (14) are fixedly connected to both sides of the inner wall of the pump cover (3), a protective sleeve (5) is fixedly connected to the outside of the pump body (1), a buffer mechanism is arranged inside the pump cover (3), and a replacement mechanism is arranged on the outside of the pump body (1).

2. A reciprocating pump hydraulic end according to claim 1, characterized in that: The buffer mechanism comprises a damper (13) fixedly mounted between the pump cover (3) and the base (12); a buffer block (16) is slidably connected to the outer side of the cross bar (14); a buffer spring (17) is sleeved on the outer side of the cross bar (14) and between the buffer block (16) and the inner wall of the pump cover (3); the buffer block (16) is slidably connected to the inner wall of the pump cover (3); the top end of the buffer block (16) is rotatably connected to a connecting rod (15); and the base (12) is rotatably connected to an end of the connecting rod (15) away from the buffer block (16).

3. A reciprocating pump hydraulic end according to claim 1, characterized in that: The replacement mechanism comprises an external thread provided on a side of the pump body (1) close to the pump cover (3); the inner wall of the pump cover (3) is provided with an internal thread; the pump body (1) and the pump cover (3) are threadedly connected; both sides of the pump cover (3) are fixedly connected with a fixing plate (9); a screw rod (10) passes through between the fixing plate (9) and the protective sleeve (5); both ends of the outer side of the screw rod (10) are threadedly connected with fixing nuts (11); the fixing nuts (11) are in contact with the outer side of the fixing plate (9).

4. A reciprocating pump hydraulic end according to claim 1, characterized in that: The replacement mechanism further comprises two hidden grooves (21) provided inside the piston body (18), each of the hidden grooves (21) being provided with a bolt (22), and the piston body (18) and the piston rod (4) are connected via the bolts (22).

5. The reciprocating pump hydraulic end according to claim 1, characterized in that: A sealing member (19) with an annular structure is embedded in the outer bottom end of the pump body (1), and a sealing gasket (20) with an annular structure is embedded in the inner wall of the pump cover (3), and the sealing gasket (20) is in conflict with the sealing member (19).

6. A reciprocating pump hydraulic end according to claim 1, characterized in that: Both sides of the pump body (1) are fixedly connected to a delivery pipe (7), and a one-way ball valve (8) is fixedly installed inside the delivery pipe (7).

7. A reciprocating pump hydraulic end according to claim 1, characterized in that: The pump body (1) and the pump top (2) are both provided with wear-resistant rings (6) for use with the piston rod (4).

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