Flow guiding structure and plunger pump

Abstract

This utility model provides a flow guiding structure and a plunger pump. The flow guiding structure includes: a flow guiding channel disposed on the plunger pump housing; a connecting channel disposed on the second end cover of the plunger pump; the housing is a cylindrical structure with a first end and a second end disposed opposite to each other along its axial direction, the first end of the housing having a first end cover; the second end cover is detachably connected to the second end of the housing to form a sealed cavity structure; the first end of the connecting channel is used to communicate with the high-pressure chamber on the plunger of the plunger pump, and the second end of the connecting channel is connected to the first end of the flow guiding channel; a guide channel is disposed on the swashplate seat of the plunger pump; the first end of the guide channel is connected to the second end of the flow guiding channel; the second end of the guide channel is connected to the gap between the swashplate and the swashplate seat of the plunger pump. This flow guiding structure is used to guide high-pressure oil.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and more specifically, to a flow guiding structure and a plunger pump. Background Technology

[0002] The swashplate is the core component of the variable displacement mechanism of a piston pump. Its main function is to control the pump's displacement, which is achieved by the swashplate's oscillation. The swashplate seat, also known as a "sliding bearing," is usually used in conjunction with the swashplate. The swashplate and swashplate seat work together to achieve variable displacement. The swashplate and swashplate seat are also one of the core friction pairs of the piston pump.

[0003] Friction pair wear is a major cause of hydraulic piston pump failure and reduced mechanical efficiency, therefore reducing friction pair wear is an important task.

[0004] To reduce friction loss between friction pairs and improve the mechanical efficiency of hydraulic transmission, oil needs to be injected between the friction pairs to form an oil film. This oil film can improve the working conditions of the friction pairs, provide lubrication, and allow small particles to pass through, preventing the friction pairs from being scratched by particles.

[0005] like Figure 1 As shown, the existing technology adds a small orifice 1 to the high-pressure working area of ​​the swashplate, introducing high-pressure oil from the plunger pump outlet into the space between the swashplate 3 and the swashplate seat 4 through the slipper plunger 2, thereby lubricating the swashplate 3 and the swashplate seat 4 to reduce friction loss and wear on the swashplate 3 runway and the swashplate seat 4. This swashplate small orifice 1 structure has a throttling effect, but the large pressure drop before and after the small orifice 1 easily leads to cavitation, affecting the reliability of hydraulic transmission, and is only suitable for medium and high-pressure conditions. Furthermore, oil particles transmitted through the small orifice 1 can easily clog the small orifice 1, leading to hydrostatic support failure, and requiring high oil cleanliness. Utility Model Content

[0006] The main purpose of this invention is to provide a flow guiding structure and a plunger pump for guiding high-pressure oil.

[0007] To achieve the above objectives, according to one aspect of the present invention, a flow guiding structure is provided, comprising: a flow guiding channel disposed on the housing of a plunger pump; a connecting channel disposed on the second end cover of the plunger pump; the housing is a cylindrical structure having a first end and a second end disposed opposite to each other along its axial direction, the first end of the housing having a first end cover; the second end cover being detachably connected to the second end of the housing to form a sealed cavity structure; the first end of the connecting channel being used to communicate with a high-pressure chamber on the plunger of the plunger pump, and the second end of the connecting channel being connected with the first end of the flow guiding channel; a guide channel disposed on the swashplate seat of the plunger pump; the first end of the guide channel being connected with the second end of the flow guiding channel; and the second end of the guide channel being connected with the gap between the swashplate and the swashplate seat of the plunger pump.

[0008] Furthermore, the second end cap is provided with a first protrusion, and the second end of the connecting channel extends to the protruding end face of the first protrusion; the first protrusion is used to insert into the first end of the guiding channel so that the second end of the connecting channel communicates with the first end of the guiding channel. Alternatively, the second end of the housing is provided with a second protrusion, and the first end of the guiding channel extends to the protruding end face of the second protrusion; the second protrusion is used to insert into the second end of the connecting channel so that the second end of the connecting channel communicates with the first end of the guiding channel.

[0009] Furthermore, the flow guiding structure also includes a first sealing ring. The first sealing ring is sandwiched between the outer peripheral wall of the first protrusion and the channel wall of the flow guiding channel; or, the first sealing ring is sandwiched between the outer peripheral wall of the second protrusion and the channel wall of the connecting channel.

[0010] Furthermore, the connecting channel includes multiple sequentially connected third channel segments, with any two adjacent third channel segments of the connecting channel arranged at an angle.

[0011] Furthermore, a third protrusion is provided on the cavity wall of the housing, and the second end of the guide channel extends to the protruding end face of the third protrusion; the third protrusion is used to insert into the first end of the guide channel so that the first end of the guide channel communicates with the second end of the guide channel. Alternatively, a fourth protrusion is provided on the swashplate seat, and the first end of the guide channel extends to the protruding end face of the fourth protrusion; the fourth protrusion is used to insert into the second end of the guide channel so that the first end of the guide channel communicates with the second end of the guide channel.

[0012] Furthermore, the flow guiding structure also includes a second sealing ring. The second sealing ring is sandwiched between the outer peripheral wall of the third protrusion and the channel wall of the guide channel; or, the second sealing ring is sandwiched between the outer peripheral wall of the fourth protrusion and the channel wall of the flow guiding channel.

[0013] Furthermore, the flow guiding channel includes multiple sequentially connected fourth channel segments, with any two adjacent fourth channel segments of the flow guiding channel arranged at an angle.

[0014] Furthermore, the guide channel includes a first channel segment and multiple second channel segments, the first end of the first channel segment being the first end of the guide channel; the first ends of the multiple second channel segments are all connected to the second ends of the first channel segment; the second end of the guide channel includes the second ends of the multiple second channel segments.

[0015] According to another aspect of the present invention, a plunger pump is provided, which includes a housing, a second end cap, a plunger, a swashplate, a swashplate seat, and the aforementioned flow guiding structure.

[0016] Furthermore, there are multiple flow guiding structures, which are distributed circumferentially along the plunger pump.

[0017] The present invention utilizes a flow guiding structure comprising a flow guiding channel, a connecting channel, and a guiding channel. The flow guiding channel is disposed on the piston pump housing; the connecting channel is disposed on the second end cover of the piston pump; the first end of the connecting channel is connected to the high-pressure chamber on the piston of the piston pump, and the second end of the connecting channel is connected to the first end of the flow guiding channel; the guiding channel is disposed on the swashplate seat of the piston pump; the first end of the guiding channel is connected to the second end of the flow guiding channel; and the second end of the guiding channel is connected to the gap between the swashplate and the swashplate seat of the piston pump.

[0018] The flow guiding structure of this application guides the high-pressure oil from the plunger pump outlet sequentially through the connecting channel on the second end cover, the flow guiding channel on the housing, and the guide channel on the swashplate seat, introducing it between the friction pair of the swashplate and the swashplate seat. An oil film is formed between the swashplate and the swashplate seat, providing stable hydrostatic support for the friction pair of the swashplate and the swashplate seat, optimizing mechanical efficiency loss and swashplate runway wear problems; that is, reducing friction loss between the swashplate and the swashplate seat, improving mechanical efficiency and hydraulic transmission reliability, and extending the service life of the plunger pump. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the orifice structure on the swashplate of a prior art plunger pump is shown; Figure 2 A schematic diagram of the plunger pump according to the present invention is shown; Figure 3 This invention illustrates one arrangement of the flow guiding channel and the connecting channel in the flow guiding structure according to the present invention; Figure 4 This invention illustrates another way in which the flow guiding channel and the connecting channel of the flow guiding structure according to the present invention are combined; Figure 5 This invention illustrates one arrangement of the flow guiding channel and the guide channel in the flow guiding structure according to the present invention; Figure 6 This invention illustrates another way in which the flow guiding channel and the guide channel of the flow guiding structure according to the present invention are combined; Figure 7 A schematic diagram of a guide channel of the flow guiding structure according to the present invention is shown.

[0020] The above figures include the following reference numerals: 1. Orifice; 2. Plunger; 3. Swashplate; 4. Swashplate seat; 20. Plunger; 30. Swashplate; 31. Swashplate seat; 311. Guide channel; 3111. First channel section; 3112. Second channel section; 312. Fourth protrusion; 50. Housing; 501. First end cap; 51. Flow channel; 511. Fourth channel section; 52. Second protrusion; 53. Third protrusion; 60. Second end cap; 61. Connecting channel; 611. Third channel segment; 62. First protrusion; 63. Joint surface. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] This utility model provides a flow guiding structure, which is applied to a plunger pump; please refer to... Figure 2 The flow guiding structure includes a flow guiding channel 51, a connecting channel 61, and a guiding channel 311.

[0025] The plunger pump includes a housing 50, a second end cover 60, a plunger 20, a swashplate seat 31, and a swashplate 30. The housing 50 has a cylindrical structure and has a first end and a second end arranged opposite to each other along its axial direction. The first end of the housing 50 is closed, that is, the first end of the housing 50 has a first end cover 501. The second end of the housing 50 is open. The second end cover 60 is detachably connected to the second end of the housing 50. When the second end cover 60 is connected to the second end of the housing 50, it forms a sealed cavity structure. The plunger 20, the swashplate 30, and the swashplate seat 31 are all disposed inside the housing 50.

[0026] A flow guide channel 51 is provided on the housing 50 of the plunger pump; a connecting channel 61 is provided on the second end cover 60 of the plunger pump; the first end of the connecting channel 61 is used to connect with the high pressure chamber on the plunger 20 of the plunger pump, and the second end of the connecting channel 61 is connected with the first end of the flow guide channel 51; a guide channel 311 is provided on the swashplate seat 31 of the plunger pump; the first end of the guide channel 311 is connected with the second end of the flow guide channel 51; the second end of the guide channel 311 is connected with the gap between the swashplate 30 and the swashplate seat 31 of the plunger pump.

[0027] The flow guiding structure of this application guides the high-pressure oil from the plunger pump outlet sequentially through the connecting channel 61 on the second end cover 60, the flow guiding channel 51 on the housing 50, and the guide channel 311 on the swashplate seat 31, introducing it between the friction pair of the swashplate 30 and the swashplate seat 31. An oil film is formed between the swashplate 30 and the swashplate seat 31, providing stable hydrostatic support for the friction pair of the swashplate 30 and the swashplate seat 31, optimizing mechanical efficiency loss and swashplate runway wear; that is, reducing friction loss between the swashplate 30 and the swashplate seat 31, improving mechanical efficiency and hydraulic transmission reliability, and extending the service life of the plunger pump.

[0028] Optionally, the swash plate 31 is a bearing.

[0029] Specifically, the swash plate seat 31 is mounted on the outside of the swash plate 30.

[0030] It should be noted that, Figure 2 The cross-sectional view shown does not show that "the first end of the connecting channel 61 is connected to the high-pressure chamber on the plunger 20".

[0031] Optionally, the first end of the connecting channel 61 is connected to the high-pressure chamber on the plunger 20. Alternatively, the second end cap 60 is provided with a fifth protrusion, and the first end of the connecting channel 61 extends to the protruding end face of the fifth protrusion; the fifth protrusion is used to insert into the high-pressure chamber on the plunger 20, so that the first end of the connecting channel 61 is connected to the high-pressure chamber on the plunger 20. Alternatively, the plunger 20 is provided with a sixth protrusion, and the high-pressure chamber on the plunger 20 extends to the protruding end face of the sixth protrusion; the sixth protrusion is used to insert into the first end of the connecting channel 61, so that the first end of the connecting channel 61 is connected to the high-pressure chamber on the plunger 20.

[0032] Optionally, the third sealing ring is sandwiched between the outer peripheral wall of the fifth protrusion and the cavity wall of the high-pressure chamber on the plunger 20; or, the third sealing ring is sandwiched between the outer peripheral wall of the sixth protrusion and the channel wall of the connecting channel 61.

[0033] Optionally, the third sealing ring is a Glyd ring.

[0034] Optionally, the housing 50 is a one-piece molded structure.

[0035] Optionally, the first end cap 501 and the second end cap 60 are the front end cap and the rear end cap, respectively.

[0036] In this application, as Figure 3 As shown, the second end cap 60 has a first protrusion 62, and the second end of the connecting channel 61 extends to the protruding end face of the first protrusion 62; the first protrusion 62 is used to insert into the first end of the guide channel 51 so that the second end of the connecting channel 61 is connected to the first end of the guide channel 51. Or, as Figure 4 As shown, a second protrusion 52 is provided on the second end face of the housing 50, and the first end of the flow channel 51 extends to the protruding end face of the second protrusion 52; the second protrusion 52 is used to insert into the second end of the communication channel 61 so that the second end of the communication channel 61 is connected to the first end of the flow channel 51.

[0037] Optionally, the flow guiding structure also includes a first sealing ring. The first sealing ring is sandwiched between the outer peripheral wall of the first protrusion 62 and the channel wall of the flow guiding channel 51; or, the first sealing ring is sandwiched between the outer peripheral wall of the second protrusion 52 and the channel wall of the connecting channel 61. In this way, the oil circuit can be sealed so that the high-pressure oil in the second end cover 60 flows into the swashplate seat 31 only through the flow guiding channel 51, without leaking into the housing 50.

[0038] Optionally, the first sealing ring is a Glyd ring.

[0039] Optionally, the connecting channel 61 includes a plurality of third channel segments 611, which are connected sequentially, and any two adjacent third channel segments 611 of the connecting channel 61 are arranged at an angle.

[0040] like Figure 2 As shown, the connecting channel 61 includes two connected third channel segments 611, and the two third channel segments 611 of the connecting channel 61 are perpendicular to each other.

[0041] In this application, as Figure 5 As shown, a third protrusion 53 protrudes from the cavity wall of the housing 50, and the second end of the guide channel 51 extends to the protruding end face of the third protrusion 53; the third protrusion 53 is used to insert into the first end of the guide channel 311, so that the first end of the guide channel 311 communicates with the second end of the guide channel 51. Or, as Figure 6 As shown, a fourth protrusion 312 is provided on the swash plate seat 31, and the first end of the guide channel 311 extends to the protruding end face of the fourth protrusion 312; the fourth protrusion 312 is used to insert into the second end of the guide channel 51 so that the first end of the guide channel 311 is connected to the second end of the guide channel 51.

[0042] Optionally, the flow guiding structure also includes a second sealing ring. The second sealing ring is sandwiched between the outer peripheral wall of the third protrusion 53 and the channel wall of the guide channel 311; or, the second sealing ring is sandwiched between the outer peripheral wall of the fourth protrusion 312 and the channel wall of the flow guiding channel 51. In this way, the oil circuit can be sealed to prevent oil leakage into the housing 50.

[0043] Optionally, the second sealing ring is a Glyd ring.

[0044] Optionally, the second end of the flow channel 51 is located on the first end cover 501, that is, the third protrusion 53 protrudes from the first end cover 501.

[0045] Optionally, the flow guiding channel 51 includes a plurality of fourth channel segments 511, which are connected in sequence, and any two adjacent fourth channel segments 511 of the flow guiding channel 51 are arranged at an angle.

[0046] like Figure 2 As shown, the flow channel 51 includes three sequentially connected fourth channel segments 511, and any two adjacent fourth channel segments 511 of the flow channel 51 are perpendicular to each other.

[0047] In this application, optionally, the guide channel 311 can be configured as follows: Figure 2 The channel structure shown. Alternatively, guide channel 311 can also be as follows: Figure 7 As shown, it includes a first channel segment 3111 and multiple second channel segments 3112. The first end of the first channel segment 3111 is the first end of the guide channel 311. The first ends of the multiple second channel segments 3112 are all connected to the second ends of the first channel segment 3111. The second end of the guide channel 311 includes the second ends of the multiple second channel segments 3112.

[0048] Optionally, any two second channel segments 3112 of the guide channel 311 are arranged at an angle.

[0049] like Figure 7 As shown, the guide channel 311 includes two second channel segments 3112.

[0050] Optionally, a stepped structure is provided on each channel wall or cavity wall so that when the corresponding protrusion is inserted into the channel wall or cavity wall, the protruding end face of the corresponding protrusion abuts against the stepped surface of the stepped structure. Here, the protrusion is the first protrusion 62, or the second protrusion 52, or the third protrusion 53, or the fourth protrusion 312, or the fifth protrusion, or the sixth protrusion; and each channel wall or cavity wall is the channel wall of the guide channel 51, or the channel wall of the connecting channel 61, or the channel wall of the guide channel 311, or the cavity wall of the high-pressure chamber on the plunger 20.

[0051] This utility model also provides a plunger pump, which includes a housing 50, a second end cover 60, a plunger 20, a swashplate 30, a swashplate seat 31, and the aforementioned flow guiding structure; the plunger 20, the swashplate 30, and the swashplate seat 31 are all disposed within the housing 50.

[0052] Optionally, the piston pump is a hydraulic piston pump.

[0053] Optionally, there are multiple flow guiding structures, which are distributed circumferentially along the piston pump, that is, multiple flow guiding structures are distributed circumferentially along the housing 50.

[0054] In this application, when the second end of the housing 50 is connected to the second end cover 60, the second end face of the housing 50 and the mating surface of the second end cover 60 are in contact. Figure 2 The mating surface 63 is the mating surface of the second end cap 60.

[0055] Optionally, the second end of the housing 50 is locked to the second end cover 60 by bolts, at which time the second end face of the housing 50 and the mating surface of the second end cover 60 are tightly fitted.

[0056] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: In the flow guiding structure provided in this application, the flow guiding structure includes a flow guiding channel 51, a connecting channel 61, and a guiding channel 311. The flow guiding channel 51 is disposed on the housing 50 of the plunger pump; the connecting channel 61 is disposed on the second end cover 60 of the plunger pump; the first end of the connecting channel 61 is used to communicate with the high-pressure chamber on the plunger 20 of the plunger pump, and the second end of the connecting channel 61 is connected with the first end of the flow guiding channel 51; the guiding channel 311 is disposed on the swashplate seat 31 of the plunger pump; the first end of the guiding channel 311 is connected with the second end of the flow guiding channel 51; the second end of the guiding channel 311 is connected with the gap between the swashplate 30 and the swashplate seat 31 of the plunger pump.

[0057] The flow guiding structure of this application guides the high-pressure oil from the plunger pump outlet sequentially through the connecting channel 61 on the second end cover 60, the flow guiding channel 51 on the housing 50, and the guide channel 311 on the swashplate seat 31, introducing it between the friction pair of the swashplate 30 and the swashplate seat 31. An oil film is formed between the swashplate 30 and the swashplate seat 31, providing stable hydrostatic support for the friction pair of the swashplate 30 and the swashplate seat 31, optimizing mechanical efficiency loss and swashplate runway wear; that is, reducing friction loss between the swashplate 30 and the swashplate seat 31, improving mechanical efficiency and hydraulic transmission reliability, and extending the service life of the plunger pump.

[0058] The flow guiding structure of this application guides high-pressure oil from the high-pressure oil chamber outlet at the second end cover 60 to the swashplate seat 31 through the flow guiding channel 51; the guide channel 311 on the swashplate seat 31 guides high-pressure oil from the outlet of the flow guiding channel 51 to the friction pair between the swashplate seat 31 and the swashplate 30; the flow guiding structure of this application directly introduces high-pressure oil into the hydrostatic support of the swashplate 30 through the flow guiding channel 51, which effectively improves the reliability and response speed of the hydrostatic support when the swashplate 30 swings.

[0059] Compared with existing technology structures, the flow guiding structure of this application: does not produce a throttling effect, does not cause cavitation, and is not sensitive to oil cleanliness, that is, has lower requirements for oil cleanliness and higher overall reliability; can withstand higher peak pressure; and can improve product life and working performance.

[0060] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of 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 so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flow guiding structure, characterized in that, include: A flow channel (51) is provided on the housing (50) of the plunger pump; A connecting channel (61) is provided on the second end cap (60) of the plunger pump; the housing (50) is a cylindrical structure, and the housing (50) has a first end and a second end disposed opposite to each other along its axial direction. The first end of the housing (50) has a first end cap (501); the second end cap (60) is detachably connected to the second end of the housing (50) to form a sealed cavity structure; the first end of the connecting channel (61) is used to communicate with the high pressure chamber (21) on the plunger (20) of the plunger pump, and the second end of the connecting channel (61) is connected with the first end of the guide channel (51); A guide channel (311) is provided on the swashplate seat (31) of the plunger pump; the first end of the guide channel (311) is connected to the second end of the flow guide channel (51); the second end of the guide channel (311) is connected to the gap between the swashplate (30) of the plunger pump and the swashplate seat (31).

2. The flow guiding structure according to claim 1, characterized in that, The second end cap (60) is provided with a first protrusion (62), and the second end of the connecting channel (61) extends to the protruding end face of the first protrusion (62); the first protrusion (62) is used to insert into the first end of the guide channel (51) so that the second end of the connecting channel (61) is connected to the first end of the guide channel (51); or The second end of the housing (50) is provided with a second protrusion (52), and the first end of the flow channel (51) extends to the protruding end face of the second protrusion (52); the second protrusion (52) is used to insert into the second end of the communication channel (61) so that the second end of the communication channel (61) is connected to the first end of the flow channel (51).

3. The flow guiding structure according to claim 2, characterized in that, The flow guiding structure also includes a first sealing ring. The first sealing ring is sandwiched between the outer peripheral wall of the first protrusion (62) and the channel wall of the guide channel (51); or The first sealing ring is sandwiched between the outer peripheral wall of the second protrusion (52) and the channel wall of the connecting channel (61).

4. The flow guiding structure according to claim 1, characterized in that, The connecting channel (61) includes a plurality of sequentially connected third channel segments (611), and any two adjacent third channel segments (611) of the connecting channel (61) are arranged at an angle.

5. The flow guiding structure according to claim 1, characterized in that, A third protrusion (53) is provided on the cavity wall of the housing (50), and the second end of the guide channel (51) extends to the protruding end face of the third protrusion (53); the third protrusion (53) is used to insert into the first end of the guide channel (311) so that the first end of the guide channel (311) communicates with the second end of the guide channel (51); or The swash plate seat (31) is provided with a fourth protrusion (312), and the first end of the guide channel (311) extends to the protruding end face of the fourth protrusion (312); the fourth protrusion (312) is used to insert into the second end of the guide channel (51) so that the first end of the guide channel (311) is connected to the second end of the guide channel (51).

6. The flow guiding structure according to claim 5, characterized in that, The flow guiding structure also includes a second sealing ring. The second sealing ring is sandwiched between the outer peripheral wall of the third protrusion (53) and the channel wall of the guide channel (311); or The second sealing ring is sandwiched between the outer peripheral wall of the fourth protrusion (312) and the channel wall of the flow channel (51).

7. The flow guiding structure according to claim 1, characterized in that, The flow channel (51) includes a plurality of sequentially connected fourth channel segments (511), and any two adjacent fourth channel segments (511) of the flow channel (51) are arranged at an angle.

8. The flow guiding structure according to claim 1, characterized in that, The guide channel (311) includes a first channel segment (3111) and a plurality of second channel segments (3112). The first end of the first channel segment (3111) is the first end of the guide channel (311). The first ends of the plurality of second channel segments (3112) are all connected to the second end of the first channel segment (3111). The second end of the guide channel (311) includes the second end of the plurality of second channel segments (3112).

9. A plunger pump, characterized in that, It includes a housing (50), a second end cap (60), a plunger (20), a swashplate (30), a swashplate seat (31), and a flow guiding structure as described in any one of claims 1 to 8.

10. The plunger pump according to claim 9, characterized in that, The flow guiding structure is multiple, and the multiple flow guiding structures are distributed along the circumference of the plunger pump.

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