Reciprocating plunger pump fluid end structure

Abstract

The utility model discloses a fluid end structure of a reciprocating plunger pump. The fluid end structure comprises a pump shell, a plunger, a high-pressure cylinder sleeve set, a valve body, a liquid drainage valve set and a liquid suction valve set. A middle hole channel of the valve body is an open hole channel, a groove is formed in the open end of the open hole channel, and a partition cavity is formed in the pump shell. The valve body is connected with one end of the pump shell; the high-pressure cylinder sleeve group comprises a cylinder sleeve shell, a spring seat, a packing, a pressing sleeve and a compression nut; a positioning sleeve is connected in a middle hole channel of the valve body, a cylinder sleeve outer shell is arranged in a partition cavity of the pump shell, one end of the cylinder sleeve outer shell is connected with a groove of the valve body and the positioning sleeve in a clamped mode, the cylinder sleeve outer shell is connected with the valve body through a fastener, a spring seat, a pressing sleeve and packing are arranged in the cylinder sleeve outer shell, and the other end of the cylinder sleeve outer shell is connected with a pressing nut. One end of the plunger is located on the inner side of the cylinder sleeve shell and is in sealing sliding connection with the cylinder sleeve shell through packing. According to the utility model, the replacement of a sealing element, the replacement of a plunger, the replacement of a high-pressure cylinder sleeve and the like can be realized without dismounting a large and heavy valve body, and the maintenance is convenient and fast.

Description

Technical Field

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

[0002] The component of a reciprocating pump that separates the plunger from the slider and extends to the pump's inlet and outlet flanges is called the hydraulic end. This is the portion where the medium flows through, and typically consists of the valve body, high-pressure cylinder assembly, plunger and seal, suction valve assembly, and discharge valve assembly.

[0003] like Figure 1 As shown, the existing hydraulic end structure includes a pump housing 1, a valve body 4, a high-pressure cylinder assembly 3, a plunger 2, a suction valve assembly 7, and a discharge valve assembly 5. The discharge valve assembly 5 is located at the top of the valve body 4, and the suction valve assembly 7 is located at the bottom. The high-pressure cylinder assembly 3 includes a cylinder liner housing 301 and packing 303 (seal). A nut on one side of the cylinder liner housing 301 presses the packing 303 against the inner surface of the housing. The high-pressure cylinder assembly 3 is in sealed sliding connection with the plunger 2 via the packing 303. An open groove 101 for embedding the high-pressure cylinder sleeve group 3 is provided in the pump casing 1. The high-pressure cylinder sleeve group 3 is inserted into the open groove 101 from the open side of the pump casing 1. The outer wall of the high-pressure cylinder sleeve group 3 is engaged with the inner wall of the open groove 101. Then the valve body 4 is fixed to one side of the pump casing 1 by bolts. The valve body 4 presses the high-pressure cylinder sleeve group 3 into the open groove 101 of the pump casing 1. At this time, the plunger 2 extends into the channel in the middle of the valve body 4, and then the other end of the plunger 2 is connected to the slider 6 from inside the pump casing 1.

[0004] The packing 303 in the high-pressure cylinder group 3 is a reciprocating seal, which is easily worn by the plunger 2. After a period of operation, the working fluid will leak, affecting the performance of the reciprocating pump. Figure 1 When the hydraulic end structure of the high-pressure cylinder sleeve group 3, packing 303 and / or plunger 2 needs to be replaced, first, disassemble one end of the plunger 2 from the slider 6, then remove the bolts between the valve body 4 and the pump housing 1, remove the valve body 4 from the pump housing 1 as a whole, then remove the plunger 2 from the high-pressure cylinder sleeve group 3 and replace it with a new one. Remove the high-pressure cylinder sleeve group 3 from the open groove 101 of the pump housing 1 and replace it with a new one. Loosen the nut at one end of the high-pressure cylinder sleeve group 3 and remove the packing 303 inside. The packing 303 can be replaced. Figure 1 The pump housing 1 is provided with an inner wall of an open groove 101 which is engaged with the high pressure cylinder sleeve group 3. Figure 1 As shown in point a in the figure, the high-pressure cylinder sleeve group 3 cannot be removed from the pump housing 1 (i.e., the side originally away from the valve body 4), and can only be removed from the side where the valve body 4 is located. Therefore, only by removing the large and heavy valve body 4 from the pump housing 1 can the high-pressure cylinder sleeve group 3 and the plunger 2 be removed from the open groove 101, and the high-pressure cylinder sleeve group 3, the packing 303 and / or the plunger 2 can be replaced, andFigure 1 The central axes of both the liquid discharge valve group 5 and the liquid suction valve group 7 in the middle valve body 4 are on the same axis, belonging to a direct-flow type hydraulic end. The valve body 4 of the direct-flow type hydraulic end is thick and heavy, and the working intensity of disassembling the valve body 4 is relatively high, and the maintenance efficiency is low. Summary of the Invention

[0005] The technical problem to be solved by the present utility model is to provide a hydraulic end structure of a reciprocating plunger pump in view of the above-mentioned deficiencies of the prior art. The hydraulic end structure of this reciprocating plunger pump can solve the replacement of seals, the replacement of plungers, the replacement of high-pressure cylinder sleeves, etc. without disassembling the large and heavy valve body, and the maintenance is convenient and fast.

[0006] To achieve the above technical purpose, the technical solution adopted by the present utility model is as follows:

[0007] A hydraulic end structure of a reciprocating plunger pump, including a pump housing, a plunger, a high-pressure cylinder sleeve group, a valve body, a liquid discharge valve group and a liquid suction valve group. A liquid discharge valve group and a liquid suction valve group are arranged in the valve body;

[0008] The middle channel of the valve body is an open channel, and a groove is arranged at the open end of the open channel. A partition cavity is arranged inside the pump housing; one end of the valve body is connected to the pump housing;

[0009] The high-pressure cylinder sleeve group includes a cylinder sleeve housing, a spring seat, a packing, a gland and a compression nut;

[0010] A positioning sleeve is connected in the middle channel of the valve body. The cylinder sleeve housing is placed in the partition cavity of the pump housing. One end of the cylinder sleeve housing is clamped with the groove of the valve body and the positioning sleeve. The cylinder sleeve housing and the valve body are connected by fasteners. A spring seat, a gland and a packing are arranged inside the cylinder sleeve housing. A compression nut is connected to the other end of the cylinder sleeve housing, and the compression nut is used to press the gland, the packing and the spring seat against the positioning sleeve in sequence;

[0011] One end of the plunger is located inside the cylinder sleeve housing and is in sealed sliding connection with the cylinder sleeve housing through a packing.

[0012] As a further improved technical solution of the present utility model, the outer circular surface of one end of the cylinder sleeve housing is clamped with the inner circular surface of the groove of the valve body, and the inner circular surface of this end is clamped with the outer circular surface of one end of the positioning sleeve; the end surface of one end of the cylinder sleeve housing is simultaneously clamped with the inner table surface of the groove of the valve body and the outer table surface of the positioning sleeve.

[0013] As a further improved technical solution of the present utility model, the outer circular surface of one end of the cylinder sleeve housing is hermetically clamped with the inner circular surface of the groove of the valve body through an O-ring.

[0014] As a further improved technical solution of the present utility model, the cylinder sleeve housing and the valve body are fixedly connected by bolts.

[0015] As a further improved technical solution of the present utility model, a locknut is threadedly connected to the compression nut.

[0016] As a further improved technical solution of the present utility model, a longitudinal passage perpendicular to the open passage and a transverse passage coaxial with the open passage are provided in the valve body. A liquid discharge valve group is provided in the longitudinal passage, and a liquid suction valve group is provided in the transverse passage.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The high-pressure cylinder sleeve group and the plunger of the present utility model can be taken out and replaced separately from the partition cavity together, without disassembling the liquid suction valve group, the valve body, etc. It can greatly reduce the maintenance work of the reciprocating pump with large flow and high pressure, avoid disassembling the large and heavy valve body from the pump housing 1, reduce the working intensity, and make the maintenance convenient and fast.

[0019] The axes of the liquid discharge valve group and the liquid suction valve group in this embodiment are perpendicular to each other, which can be called a right-angle type liquid end. For reciprocating pumps with ultra-large flow of 1000 L / min and above and high pressure of 40 MPa, adopting a right-angle type liquid end can greatly reduce the thickness of the valve body and reduce the weight of the product. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the existing liquid end structure.

[0021] Figure 2 It is a schematic structural diagram of the liquid end structure of this embodiment.

[0022] Figure 3 It is a schematic structural diagram of the high-pressure cylinder sleeve group of this embodiment. Detailed Embodiments

[0023] The following further describes the detailed embodiments of the present utility model with reference to the drawings:

[0024] As Figure 2-3 shown, a liquid end structure of a reciprocating plunger pump includes a pump housing 1, a plunger 2, a high-pressure cylinder sleeve group 3, a valve body 4, a liquid discharge valve group 5, and a liquid suction valve group 7 ( Figure 2 not shown in the figure), and a liquid discharge valve group 5 and a liquid suction valve group 7 are provided in the valve body 4; a box cover is installed on the pump housing 1 through bolts.

[0025] The middle passage of the valve body 4 is an open passage 401, a groove 404 is provided at one end of the open passage 401, and a partition cavity 102 is provided inside the pump housing 1; one end of the valve body 4 is connected to the pump housing 1 through bolts.

[0026] As Figure 3As shown, the high-pressure cylinder sleeve group 3 includes a cylinder sleeve housing 301, a spring seat 302, a packing 303, a compression sleeve 304, and a compression nut 305. An O-ring groove 3011 is provided on the outer cylindrical surface at one end of the cylinder sleeve housing 301.

[0027] A positioning sleeve 8 is connected in the central passage of the valve body 4. The cylinder sleeve housing 301 is placed in the partition cavity 102 of the pump housing 1. One end of the cylinder sleeve housing 301 is clamped with the groove 404 of the valve body 4 and the positioning sleeve 8. The cylinder sleeve housing 301 and the valve body 4 are connected by fasteners (such as bolts). A spring seat 302, a compression sleeve 304, and a packing 303 are arranged in the cylinder sleeve housing 301. A compression nut 305 is threadedly connected to the other end of the cylinder sleeve housing 301. The outer surface of the compression nut 305 is threadedly connected to the inner surface at one end of the cylinder sleeve housing 301. The compression nut 305 is used to sequentially compress the compression sleeve 304, the packing 303, and the spring seat 302 onto the positioning sleeve 8.

[0028] One end of the plunger 2 is located inside the cylinder sleeve housing 301 and is in sealed sliding connection with the cylinder sleeve housing 301 through the packing 303.

[0029] In this embodiment, the outer cylindrical surface at one end of the cylinder sleeve housing 301 is clamped with the inner cylindrical surface of the groove 404 of the valve body 4, and the inner cylindrical surface at this end is clamped with the outer cylindrical surface at one end of the positioning sleeve 8; the end face at one end of the cylinder sleeve housing 301 is simultaneously clamped with the inner table surface of the groove 404 of the valve body 4 and the outer table surface of the positioning sleeve 8.

[0030] In this embodiment, the O-ring groove 3011 on the outer cylindrical surface at one end of the cylinder sleeve housing 301 is in sealed clamping connection with the inner cylindrical surface of the groove 404 of the valve body 4 through an O-ring seal.

[0031] In this embodiment, a locknut 306 is threadedly connected to the compression nut 305. The locknut 306 facilitates locking the compression nut 305.

[0032] In this embodiment, a longitudinal passage 403 perpendicular to the open passage 401 and a transverse passage 402 coaxial with the open passage 401 are further provided in the valve body 4. The transverse passage 402 penetrates the transverse end face of the valve body 4 and the through hole on the transverse end face is connected to a transverse plug. The longitudinal passage 403 penetrates the vertical end face of the valve body 4 and the through hole on the vertical end face is connected to a vertical plug. A liquid discharge valve group 5 is arranged in the longitudinal passage 403, and a liquid suction valve group 7 is arranged in the transverse passage 402. The structures of the liquid discharge valve group 5 and the liquid suction valve group 7 adopt existing structures and will not be elaborated here.

[0033] In this embodiment, one end of the positioning sleeve 8 abuts against the liquid suction valve seat in the liquid suction valve group 7, and the other end abuts against the cylinder sleeve housing 301. When the transverse plug of the transverse passage 402 of the valve body 4 and the liquid suction valve group 7 are removed, the positioning sleeve 8 can be taken out from one side of the through hole on the transverse end face.

[0034] The axes of the liquid discharge valve group 5 and the liquid suction valve group 7 in this embodiment are perpendicular to each other, which can be called a right-angle type liquid end. For reciprocating pumps with a high pressure of 40 MPa and an ultra-large flow rate of 1000 L / min or more, the use of a right-angle type liquid end can greatly reduce the thickness of the valve body and reduce the weight of the product. Most importantly, the structure of this embodiment can also achieve on-site maintenance without the need to disassemble the large and heavy valve body 4 to solve the replacement of seals, the replacement of the plunger 2, the replacement of the high-pressure cylinder sleeve group 3, etc., and the maintenance is convenient and fast.

[0035] For the structure of this embodiment, when it is necessary to replace a seal such as the packing 303, the transverse plug installed on the valve body 4 can be removed first, and then the liquid suction valve group 7 inside the valve body 4 can be removed. The positioning sleeve 8 and the spring seat 302 are taken out, and the packing 303 can be taken out from one side of the through hole on the transverse end face of the valve body 4, and then a new packing can be replaced. When replacing the plunger 2, the connecting piece between the plunger 2 and the slider 6 is removed, and the plunger 2 can be taken out from one side of the through hole on the transverse end face of the valve body 4. The end of the plunger 2 is provided with a threaded hole, which is convenient for taking out. This method does not require the valve body 4 to be disassembled from the pump housing 1.

[0036] In addition to the above method, the following method can also be used for disassembly: Remove the cover of the pump housing 1, remove the connecting piece between the plunger 2 and the slider 6 from the partition cavity 102 of the pump housing 1, remove the bolts between the cylinder liner housing 301 and the valve body 4, and take out the high-pressure cylinder sleeve group 3 and the plunger 2 from the partition cavity 102 to replace the plunger 2, the high-pressure cylinder sleeve group 3 or the packing 303 inside the high-pressure cylinder sleeve group 3, etc. In this method, the high-pressure cylinder sleeve group 3 and the plunger 2 can be taken out and replaced separately from the partition cavity 102 without disassembling the liquid suction valve group 7 and the valve body 4, etc.

[0037] This liquid end structure can greatly reduce the maintenance work of large-flow high-pressure reciprocating pumps, avoid disassembling the large and heavy valve body 4, and reduce the labor intensity.

[0038] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is subject to the claims, and any replacement, deformation, and improvement that are easily conceivable by those skilled in the art for this technology fall within the protection scope of the present invention.

Claims

1. A hydraulic end structure of a reciprocating plunger pump, comprising a pump housing (1), a plunger (2), a high-pressure cylinder sleeve group (3), a valve body (4), a liquid discharge valve group (5) and a liquid suction valve group (7). The liquid discharge valve group (5) and the liquid suction valve group (7) are arranged inside the valve body (4). It is characterized in that: The middle channel of the valve body (4) is an open channel (401). One end of the open channel (401) is provided with a groove (404). An isolation cavity (102) is arranged inside the pump housing (1). The valve body (4) is connected to one end of the pump housing (1). The high-pressure cylinder sleeve group (3) includes a cylinder sleeve outer shell (301), a spring seat (302), a packing (303), a compression sleeve (304) and a compression nut (305). A positioning sleeve (8) is connected inside the middle channel of the valve body (4). The cylinder sleeve outer shell (301) is placed inside the isolation cavity (102) of the pump housing (1). One end of the cylinder sleeve outer shell (301) is clamped with the groove (404) of the valve body (4) and the positioning sleeve (8). The cylinder sleeve outer shell (301) and the valve body (4) are connected by fasteners. A spring seat (302), a compression sleeve (304) and a packing (303) are arranged inside the cylinder sleeve outer shell (301). A compression nut (305) is connected to the other end of the cylinder sleeve outer shell (301). The compression nut (305) is used to sequentially compress the compression sleeve (304), the packing (303) and the spring seat (302) on the positioning sleeve (8). One end of the plunger (2) is located inside the cylinder sleeve outer shell (301) and is hermetically and slidably connected to the cylinder sleeve outer shell (301) through the packing (303).

2. The hydraulic end structure of the reciprocating plunger pump according to claim 1, characterized in that: The outer circular surface of one end of the cylinder sleeve outer shell (301) is clamped with the inner circular surface of the groove (404) of the valve body (4), and the inner circular surface of this end is clamped with the outer circular surface of one end of the positioning sleeve (8). The end face of one end of the cylinder sleeve outer shell (301) is simultaneously clamped with the inner table surface of the groove (404) of the valve body (4) and the outer table surface of the positioning sleeve (8).

3. The hydraulic end structure of the reciprocating plunger pump according to claim 2, wherein: The outer circular surface of one end of the cylinder sleeve outer shell (301) is hermetically clamped with the inner circular surface of the groove (404) of the valve body (4) through an O-ring seal.

4. The hydraulic end structure of the reciprocating plunger pump according to claim 1, characterized in that: The cylinder sleeve outer shell (301) and the valve body (4) are fixedly connected by bolts.

5. The hydraulic end structure of the reciprocating plunger pump according to claim 1, characterized in that: A locknut (306) is threadedly connected to the compression nut (305).

6. The hydraulic end structure of the reciprocating plunger pump according to claim 1, characterized in that: A longitudinal channel (403) perpendicular to the open channel (401) and a transverse channel (402) coaxial with the open channel (401) are arranged inside the valve body (4). The liquid discharge valve group (5) is arranged inside the longitudinal channel (403), and the liquid suction valve group (7) is arranged inside the transverse channel (402).

Images