Water pump, power assembly and tunneling machine

Abstract

The application provides a water pump, a power assembly and a heading machine, and relates to the technical field of mining equipment. According to the water pump provided in the application, the rotation of the driving shaft relative to the shell enables the relative rotation to not only transmit power but also to enable the water pump to pump fluid from the first water inlet of the shell of the water pump to the water outlet of the driving shaft, in other words, the water outlet, that is, the pressure water outlet, through which the water pump pumps out the fluid, rotates synchronously with the driving shaft. Therefore, according to the water pump provided in the application, the driving shaft in both the driving shaft and the shell is used to transmit power, and the external actuator arranged on the side of the water outlet of the driving shaft can also be provided with pressure fluid, the functions are effectively integrated in the water pump, the functions of the water pump are combined, the structure of the cutting part of the heading machine is simplified, the water pump is driven by the cutting part, the water pump piston is in sliding sealing, high-pressure sealing can be realized, and higher water pressure can be provided.

Description

Technical Field

[0001] This application relates to the field of mining equipment technology, and in particular to a water pump, power unit and tunneling machine. Background Technology

[0002] The existing tunneling machine has two separate systems for power transmission and pressurized water supply for the cutting section. The power transmission is provided by the drive shaft alone, while the pressurized water supply is provided by a separate pump system. The superposition of the power system and the pump system increases the structural complexity of the tunneling machine. In addition, the existing water pump power source provides power under a rotary seal, which has the problem of seal failure and cannot provide higher pressure. Utility Model Content

[0003] In view of this, this application provides a water pump, a power assembly, and a tunneling machine, with the aim of solving the above-mentioned technical problems to a certain extent.

[0004] This application provides a water pump for use in a tunneling machine, the water pump comprising:

[0005] A housing having a cavity and a first water inlet communicating with the cavity and the external environment;

[0006] A drive shaft, at least a portion of which is disposed within the cavity, the drive shaft being rotatable relative to the housing, the drive shaft having a second inlet and an outlet such that the outlet is rotatable with the drive shaft, and also having a channel located between the second inlet and the outlet, the first inlet and the second inlet being connected.

[0007] Multiple plunger assemblies are circumferentially spaced between the housing and the drive shaft, each plunger assembly is in communication with the channel, and each plunger assembly periodically provides positive and negative pressure into the channel as the drive shaft rotates relative to the housing;

[0008] A first valve and a second valve are both disposed within the channel. The first valve and the second valve are configured such that: when the plunger provides negative pressure to the channel, the first valve opens the second inlet side of the channel, and the second valve seals the outlet side of the channel; when the plunger provides positive pressure to the channel, the first valve seals the second inlet side of the channel, and the second valve opens the outlet side of the channel.

[0009] Based on the above technical solutions, optionally, the drive shaft has a plurality of plunger cavities corresponding one-to-one with the plurality of plunger assemblies. The plunger assembly includes a retractable plunger in the corresponding plunger cavity and a rolling element disposed on the side of the plunger facing the housing. As the drive shaft rotates relative to the housing, the rolling element periodically drives the plunger to extend and retract within the plunger cavity.

[0010] Based on any of the above technical solutions, optionally, the cavity is defined by the inner surface of the housing, the inner surface of the housing has a wave-shaped surface surrounding the outside of the drive shaft, the rolling element is located between the wave-shaped surface and the plunger, and the wave-shaped surface periodically pushes the rolling element as the drive shaft rotates relative to the housing to drive the plunger to extend and retract within the plunger cavity.

[0011] Based on any of the above technical solutions, optionally, the rolling element includes a camshaft, the camshaft includes a cam portion and a gear structure arranged sequentially in the axial direction, the inner surface of the cavity is formed with an internal gear that meshes with the gear structure, the gear structure meshes with the internal gear to roll inside the internal gear, thereby causing the cam portion to drive the plunger to extend and retract within the plunger cavity.

[0012] Based on any of the above technical solutions, optionally, the number of the second water inlets is multiple and they are distributed circumferentially along the drive shaft. The housing has an annular groove surrounding the outside of the second water inlet of the water pump, and the housing also has a second water inlet communicating with the annular groove and the external environment.

[0013] Optionally, based on any of the above technical solutions, the drive shaft includes a shaft body, the shaft body having a first recess and a second recess in the axial direction, the second recess being located on the outlet side and the first recess being located on the inlet side.

[0014] Optionally, based on any of the above technical solutions, the drive shaft has a pressure water plate, which is embedded in the second recess and is used to position the second valve.

[0015] Optionally, based on any of the above technical solutions, the drive shaft has a water inlet disc, which is embedded in the first recess, and the water inlet disc is used to position the first valve.

[0016] Secondly, this application provides a power assembly, which includes the water pump described above.

[0017] Thirdly, this application provides a tunneling machine, which includes a water pump as described above, or a power assembly as described above.

[0018] According to the water pump provided in this application, the rotation of the drive shaft relative to the water pump allows this relative rotation to both transmit power and cause the water pump to pump fluid from the first inlet of the water pump housing to the outlet of the drive shaft. In other words, the outlet, i.e., the pressure port, from which the fluid is pumped out by the water pump also rotates synchronously. Therefore, the water pump provided in this application, by utilizing the drive shaft in both the drive shaft and the housing to transmit power, can also provide pressurized fluid to the external actuator arranged on the side where the outlet of the drive shaft is located, effectively integrating functions into the water pump, realizing the composite function of the water pump, and simplifying the structure of the cutting section of the tunneling machine. The water pump is driven by the power of the cutting section, and the water pump piston has a sliding seal, which can achieve high-pressure sealing and thus provide higher water pressure.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a cross-sectional view along the axial direction of a first example of a water pump provided according to an embodiment of this application is shown.

[0022] Figure 2 A schematic diagram of the cross-section of section AA.

[0023] Figure 3 A schematic diagram of a cross-sectional view along the axial direction of a second example of a water pump provided according to an embodiment of this application is shown.

[0024] Figure 4 It shows Figure 3 A schematic diagram of the cross-sectional view of section BB in the middle.

[0025] Figure 5 It shows Figure 3 A schematic diagram of the cross-sectional view of section C in the middle.

[0026] Figure 6 A schematic diagram shows an example of a water pump being used in the cutting section of a tunneling machine.

[0027] Figure 7 This diagram illustrates another example of a water pump being used in the cutting section of a tunneling machine.

[0028] Figure label:

[0029] 10 - Water pump; 100 - Housing; 110 - Cavity; 120 - Waveform surface; 130 - Grease chamber;

[0030] 200 - Drive shaft; 210 - Second inlet; 220 - Outlet; 230 - Channel; 240 - Leakage channel; 250 - Shaft body; 260 - First recess; 270 - Second recess;

[0031] 300 - Piston assembly; 310 - Piston cavity; 320 - Piston; 330 - Rolling element;

[0032] 400 - First valve; 500 - Second valve; 600 - Pressure water pan; 700 - Inlet pan; 800 - Pressure regulating valve; 810 - Leakage channel of pressure regulating valve. Detailed Implementation

[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0037] According to a first aspect of the embodiments of this application, a water pump is provided. The structure and working principle of the water pump 10 will be described in detail below with reference to the accompanying drawings.

[0038] According to the embodiments of this application, the water pump 10 is used in a tunneling machine. The water pump 10 includes a housing 100, a drive shaft 200, a plurality of plunger assemblies 300, a first valve 400, and a second valve 500.

[0039] In one embodiment, the housing 100 has a cavity 110, a first inlet communicating with the cavity and the external environment, at least a portion of a drive shaft 200 may be disposed within the cavity 110, the drive shaft 200 is rotatable relative to the housing 100, the drive shaft 200 has a second inlet 210 and an outlet 220 such that the outlet 220 can rotate with the drive shaft 200, and also has a channel 230 located between the second inlet 210 and the outlet 220, the first inlet and the second inlet 210 communicating with each other.

[0040] In the embodiment, the plurality of plunger assemblies 300 described above are arranged circumferentially between the housing 100 and the drive shaft 200, each plunger assembly 300 is connected to the channel 230, and each plunger assembly 300 periodically provides positive and negative pressure into the channel 230 as the drive shaft 200 rotates relative to the housing 100.

[0041] In this embodiment, both the first valve 400 and the second valve 500 are disposed within the channel 230. The first valve 400 and the second valve 500 are configured such that when the plunger provides negative pressure to the channel 230, the first valve 400 opens the second inlet 210 side of the channel 230, and the second valve 500 seals the outlet 220 side of the channel 230. When the plunger provides positive pressure to the channel 230, the first valve 400 seals the second inlet 210 side of the channel 230, and the second valve 500 opens the outlet 220 side of the channel 230.

[0042] Thus, according to the water pump 10 provided in the embodiments of this application, as the drive shaft 200 rotates relative to the housing 100, each plunger assembly 300 can periodically provide positive and negative pressure to the channel 230. Specifically, when the drive shaft 200 rotates to a certain position, for example, when the plunger assembly 300 provides negative pressure to the channel 230, the second valve 500 seals the outlet 220 side of the channel 230, preventing fluids such as water from leaving the channel 230 from the outlet 220. At this time, the first valve 400 is open on the second inlet 210 side. Due to the presence of negative pressure in the channel 230, fluid can be drawn from the second inlet 210 into the channel 230 and the plunger assembly 300, forming a fluid intake.

[0043] Next, as the drive shaft 200 continues to rotate, the plunger assembly 300 provides positive pressure into the channel 230. At this time, the opening and closing states of the first valve 400 and the second valve 500 are reversed. The second inlet 210 side of the channel 230 is sealed, while the outlet 220 side is opened. Under the action of positive pressure, the fluid that was originally sucked into the channel 230 and the plunger assembly 300 moves towards the outlet 220 side and is discharged through the outlet 220 side.

[0044] Therefore, according to the water pump 10 provided in the embodiments of this application, the rotation of the drive shaft 200 relative to the housing 100 enables this relative rotation to both transmit power and cause the water pump 10 to pump fluid from the first inlet of the housing 100 to the outlet 220. In other words, the outlet 220, which pumps fluid out via the water pump 10, also rotates synchronously. Therefore, the water pump 10 provided in the embodiments of this application, while using the drive shaft 200 of both the drive shaft 200 and the housing 100 to transmit power, can also provide pressurized fluid to the external actuator arranged on the side where the second inlet 210 of the drive shaft 200 is located. This effectively integrates functions into the water pump 10, achieving a composite function of the water pump 10, and simplifies the structure of the tunneling machine's cutting section. The water pump is driven by the power of the cutting section, and the water pump piston is a sliding seal, which can achieve high-pressure sealing and thus provide higher water pressure.

[0045] In an embodiment, the external actuator described above may be, for example, the cutting section of a tunneling machine.

[0046] As an example, the housing 100 may comprise multiple parts, of which one portion is described first with reference to the drive shaft 200. In an embodiment, the housing 100 may be coaxial with the drive shaft 200. The housing 100 has two axially oriented portions, one of which may be a bearing cover. The bearing cover may be on the same side as the outlet 220, and has an integral cylindrical structure. A set of bearings for relative movement between the drive shaft 200 and the housing 100 is disposed between the bearing cover and the drive shaft 200.

[0047] In an embodiment, the drive shaft 200 may be thick in the middle and thin at both ends, thereby forming two shoulders on the outer side of the drive shaft 200 due to the abrupt change in diameter. The shoulder on the side where the outlet 220 is located is used to position the above-mentioned set of bearings. An oil seal is provided on the outer side of the set of bearings opposite to the shoulder to seal the space where the set of bearings is located.

[0048] In an embodiment, the axial portion of the housing 100 adjacent to the bearing cap described above may, for example, be a shell portion of the housing 100, which may be, for example, cylindrical in shape and may be detachably connected to the bearing cap, the specific connection method of which will be described in the following description.

[0049] Furthermore, in an embodiment, the plunger assembly 300 is disposed between the housing and the drive shaft 200.

[0050] According to the water pump 10 provided in the embodiments of this application, the drive shaft 200 may have a plurality of plunger cavities 310 corresponding one-to-one with the plurality of plunger assemblies 300. The plunger assembly 300 may include a retractable plunger 320 in the corresponding plunger cavity 310 and a rolling element 330 disposed on the side of the plunger 320 facing the housing 100. In the embodiments, as the drive shaft 200 rotates relative to the housing 100, the rolling element 330 periodically drives the plunger 320 to extend and retract within the plunger cavity 310.

[0051] In this embodiment, the periodic driving of the plunger 320 by the rolling element 330 essentially means that the plunger 320 periodically moves along the axis radially toward and away from the drive shaft 200. In other words, a recess for accommodating the plunger assembly 300 may be formed on the drive shaft 200. The recess may be, for example, cylindrical in shape and recessed into the drive shaft 200 from its outer surface along the radial direction of the drive shaft 200.

[0052] Therefore, as an example, the rolling element 330 described above is essentially within the recess and undergoes periodic radial movement as the drive shaft 200 rotates relative to the housing 100. In other words, it is the rotation of the drive shaft 200 relative to the housing 100 that causes the rolling element 330 to undergo the aforementioned movement; that is, the drive shaft 200 actuates the rolling element 330.

[0053] According to the water pump 10 provided in the embodiment, such as Figure 1 and Figure 2 As shown, cavity 110 may be defined by the inner surface of housing 100, the inner surface of housing 100 having a wave-shaped surface 120 surrounding the outside of drive shaft 200, and rolling element 330 located between wave-shaped surface 120 and plunger. Wave-shaped surface 120 periodically pushes rolling element 330 as drive shaft 200 rotates relative to housing 100 to drive plunger to extend and retract within plunger cavity 310.

[0054] In this example, the periodicity of the actuating plunger assembly 300 is manifested in the housing 100, that is, the inner surface of the housing portion mentioned above. This inner surface may have continuous, periodically changing crests and troughs to form a wave surface 120. The crests abut against the rolling element 330 to move in the axial direction, and the troughs allow the rolling element 330 to return to a direction away from the axial direction.

[0055] As an example, the waveform of the wave surface 120 can be, for example, a sine wave, and the rolling element 330 can be, for example, a roller. In order to maintain the position of the ball, the top of the plunger can be provided with, for example, a semi-circular groove, so that the rolling element 330 can rotate in the groove.

[0056] According to the water pump 10 provided in the embodiment, such as Figures 3 to 5 As shown, the plunger rolling element 330 may include a camshaft, for example, the rolling element 330 may be a camshaft, and the cavity 110 may be defined by the inner surface of the housing 100. As the drive shaft 200 rotates relative to the housing 100, the camshaft may roll on the inner surface to drive the plunger to extend and retract within the plunger cavity 310.

[0057] In this example, the periodicity of the plunger assembly 300 is manifested in the outer contour of the camshaft. In other words, the camshaft rolls on the inner surface. The camshaft is driven by the rotational motion of the drive shaft 200 relative to the housing 100, thereby forming a rolling motion on the inner surface of the housing 100, which in turn causes periodic eccentric motion, prompting the camshaft to drive the plunger to periodic radial motion.

[0058] In one embodiment, the drive shaft has two protruding seats for mounting a pair of bearings, thereby allowing the two ends of the camshaft to be rotatably mounted onto the seats.

[0059] In the embodiments, in both examples above, the plunger assembly 300 may include, for example, a helical spring, which may be disposed between the bottom of the recess and the bottom of the plunger and may be in a compressed state, which causes the plunger to move upward when the plunger is no longer pressed down by the camshaft, thereby creating a negative pressure.

[0060] In an embodiment, the rolling element can be, for example, a cam gear shaft, and the inner surface of the housing 100, i.e., the inner surface of the housing portion as described above, can be a substantial internal gear. Thus, when the drive shaft 200 rotates relative to the housing 100, the cam gear shaft can be induced to engage and roll on the internal gear on the inner surface of the housing 100. In an embodiment, the cam gear shaft includes a cam portion and a gear structure arranged sequentially in its axial direction. The gear structure meshes with and rolls on the aforementioned internal gear, thereby enabling the cam portion to rotate synchronously, thereby periodically driving the plunger.

[0061] According to the water pump 10 provided in the embodiments of this application, the number of second inlets 210 can be multiple, and they can be distributed circumferentially along the drive shaft 200. Here, the number of second inlets 210 can be the same as the number of channels 230, and can be the same as the number of plunger assemblies 300. For example, as shown in the figure, the number of second inlets 210, the number of channels 230, and the number of plunger assemblies 300 can all be 10, but they can be adjusted according to actual conditions, and the number can be more. The housing 100 has an annular groove surrounding the outside of the second inlet 210 of the water pump 10, and the housing 100 also has a second inlet 210 communicating with the annular groove and the external environment.

[0062] In this embodiment, there may be multiple first water inlets. An annular groove is formed on the inner wall of the housing 100 outside the multiple second water inlets 210 to ensure that the first water inlet and the second water inlet are always connected even if the drive shaft rotates relative to the housing 100.

[0063] In one embodiment, as an example, another part of the housing 100 is disposed on the side where the second water inlet 210 of the drive shaft 200 is located. This part can be, for example, a water inlet sleeve, which is directly engaged with the housing portion, and another set of bearings can be maintained between the water inlet sleeve and the drive shaft 200. Furthermore, in this embodiment, rotary seals can be provided on both sides of the annular groove in the axial direction to prevent leakage, and an oil seal can be provided at the axial end face of the water inlet sleeve.

[0064] In addition, a sealing ring is provided between the plunger and the recess where the plunger is located to prevent fluid leakage from the space between the plunger and the recess to the space between the drive shaft 200 and the housing 100. Furthermore, a guide ring can also be provided between the recess where the plunger is located and the plunger to guide the plunger to move stably within the recess.

[0065] According to the water pump 10 provided in the embodiments of this application, the drive shaft 200 may include a shaft body 250, which may have a first recess 260 and a second recess 270 in the axial direction. The first recess 260 may be located on the outlet 220 side, and the second recess 270 may be located on the inlet 210 side. In embodiments, the first recess 260 and the second recess 270 may be stepped columnar recesses or substantially stepped columnar recesses. Furthermore, in embodiments, the first recess 260 and the second recess 270 may be used to connect the drive shaft 200 to an actuator and a power input component, for example, by inserting portions of the actuator and the power input component into the first recess 260 and the second recess 270, respectively.

[0066] In the embodiments, as described above, the actuating component may be, for example, the cantilever end or telescopic part of the cutting section of the tunneling machine, and the power input component may be, for example, the cutting reducer of the cutting section of the tunneling machine.

[0067] According to the embodiments of this application, the water pump 10 has a drive shaft 200 that can have a pressure water plate 600. The pressure water plate 600 can be embedded in the second recess 270 and is used to position the second valve 500.

[0068] Similarly, the drive shaft 200 may have a water inlet plate 700, which may be embedded in the first recess 260, and the water inlet plate 700 is used to position the first valve 400.

[0069] In this embodiment, as an example, both the first valve and the second valve can be one-way valves. Their one-way conduction method has been described above and will not be repeated here.

[0070] A pressure regulating valve 800 is installed in the high-pressure water channel, that is, the high-pressure water hole of the pressure water plate 600, to regulate the outlet water pressure. The leakage water channel 810 of the pressure regulating valve is connected to the inlet water chamber.

[0071] In the embodiments, combined with Figure 1 and Figure 3 In one embodiment, a grease chamber 130 is formed between a bearing between the housing 100 and the drive shaft 200 and a seat protruding on the outer side of the drive shaft. The grease chamber is used to store lubricating oil / grease to lubricate the bearing.

[0072] In the embodiments, when the plunger or other components are not assembled into the plunger cavity, the plunger cavity and the grease cavity are substantially connected. Although, in principle, after the plunger or other components are installed into the plunger cavity, the plunger cavity is sealed by a sealing ring embedded in the inner wall of the plunger cavity to prevent the connection between the plunger cavity and the grease cavity, a complete seal is impossible.

[0073] Therefore, after a period of use, as the plunger reciprocates, a small amount of water will still leak radially into the grease chamber. Water entering the grease chamber will cause the lubricating oil / grease in the grease chamber to be emulsified by water, greatly reducing the lubrication effect. The water that continues to enter the grease chamber will also cause the pressure in the grease chamber to increase, forcing the lubricating oil / grease to leak outward axially.

[0074] Therefore, the water pump provided in this application embodiment has a leakage path, specifically a leakage channel 240. The leakage channel connects the plunger cavity and the inlet cavity. The communication position between the leakage channel 240 and the plunger cavity always faces the plunger. That is, the leakage channel 240 does not communicate with the working cavity of the plunger assembly used for water intake and pumping (the working cavity is part of the plunger cavity), but rather with the gap defined by the plunger and the inner wall of the plunger cavity. In this way, a small amount of water that may leak into the grease cavity will flow directly into the inlet cavity (the cavity located before the first valve 400, defined by the inlet plate 700 and the first recess 260) along the leakage channel 240, and be pumped to the outlet by the plunger assembly.

[0075] Furthermore, any lubricating oil / grease that may enter the aforementioned gap within the grease chamber can be guided to the water inlet chamber through the leakage channel 240. This active leakage channel design avoids the problems of lubricating oil / grease emulsification and increased pressure in the grease chamber.

[0076] In this embodiment, considering the feasibility of the process, one way to form the leakage channel is to drill from the water inlet chamber to the plunger chamber, from the grease chamber to the aforementioned drilled channel, and from the plunger chamber to the channel exiting the grease chamber. In other words, three channels converge, and finally a process plug is placed in the channel opening of the grease chamber for sealing. However, in other examples, a suitable drilling angle can be selected to drill from the plunger chamber and the water inlet chamber separately to form a connection.

[0077] According to the second aspect of the embodiments of this application, the power assembly may include the water pump 10 as described above, and also include the beneficial effects as described above, which will not be repeated here.

[0078] Combination Figure 6 and Figure 7 The power unit can be, for example, the cutting section of a tunneling machine.

[0079] Combination Figure 6 The cutting reducer transmits torque to the cutting head shaft via the water pump, specifically the pump's drive shaft (hereinafter referred to as the rotating shaft), driving the cutting head to perform tunneling operations. The high-pressure water inlet of the water pump is statically sealed to the cutting head shaft via the pump's rotating shaft, ensuring high reliability and pressure resistance, thus improving the spraying performance within the tunneling machine. According to the water pump provided in this embodiment, only one second inlet requires a rotary seal, resulting in fewer rotary seals, lower starting torque, and a simpler structure. The relative rotation of the rotating shaft and housing drives the piston to reciprocate, significantly increasing pumping pressure. This is easily achievable with current technology.

[0080] Combination Figure 7The water pump assembly housing is fixedly connected to the outer cylinder. The outer cylinder has a water inlet hole that communicates with the water pump inlet hole. The outer cylinder is fixedly connected to the cutting reducer of the tunneling machine. The output shaft of the cutting reducer is splinedly connected to the water pump rotating shaft. The reducer drives the water pump rotating shaft to rotate. The other end of the water pump rotating shaft is splinedly connected to the cutting head shaft via a spline sleeve. The spline sleeve is axially fixed to the water pump rotating shaft via a pin. One end of the spline sleeve is fixedly connected to the water pump rotating shaft, and the other end is slidably connected to the cutting head shaft via a spline. The cutting head shaft is axially fixed and radially rotates within the telescopic inner cylinder, arranged with bearings, a floating seal frame, a floating seal seat, a floating seal, and an oil seal. The telescopic inner cylinder slides axially within the outer cylinder.

[0081] In this embodiment, the telescopic protective cylinder is fixedly connected to the telescopic inner cylinder and is axially slidable on the outer cylinder. The water pump's rotating shaft outlet is sealed and fixedly connected to one end of the telescopic sealing rod. The other end of the telescopic sealing rod is equipped with a guide ring and a sealing ring, which extends and retracts within the cutting head shaft to provide a seal for the high-pressure water. Under the action of the hydraulic cylinder, the telescopic protective cylinder drives the cutting head shaft to move axially along the outer cylinder. The cutting head shaft slides within the spline sleeve, realizing the extension and retraction of the cutting head. The water pump's rotating shaft and the cutting head shaft rotate synchronously, and the telescopic sealing rod only slides within the cutting head shaft, ensuring a reliable seal.

[0082] According to the third aspect of the embodiments of this application, the tunneling machine includes the water pump 10 as described above, or the power assembly as described above, and also has the beneficial effects described above, which will not be repeated here.

[0083] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A water pump, characterized in that, The water pump is used in a tunneling machine, and the water pump includes: A housing having a cavity and a first water inlet communicating with the cavity and the external environment; A drive shaft, at least a portion of which is disposed within the cavity, the drive shaft being rotatable relative to the housing, the drive shaft having a second inlet and an outlet such that the outlet is rotatable with the drive shaft, and also having a channel located between the inlet and the outlet, the first inlet communicating with the second inlet; Multiple plunger assemblies are circumferentially spaced between the housing and the drive shaft, each plunger assembly is in communication with the channel, and each plunger assembly periodically provides positive and negative pressure into the channel as the drive shaft rotates relative to the housing; A first valve and a second valve are both disposed within the channel. The first valve and the second valve are configured such that: when the plunger provides negative pressure to the channel, the first valve opens the second inlet side of the channel, and the second valve seals the outlet side of the channel; when the plunger provides positive pressure to the channel, the first valve seals the second inlet side of the channel, and the second valve opens the outlet side of the channel.

2. The water pump according to claim 1, characterized in that, The drive shaft has a plurality of plunger cavities corresponding one-to-one with the plurality of plunger assemblies. Each plunger assembly includes a retractable plunger within the corresponding plunger cavity and a rolling element disposed on the side of the plunger facing the housing. As the drive shaft rotates relative to the housing, the rolling element periodically drives the plunger to extend and retract within the plunger cavity.

3. The water pump according to claim 2, characterized in that, The cavity is defined by the inner surface of the housing, the inner surface of the housing having a wave-shaped surface surrounding the outside of the drive shaft, the rolling element being located between the wave-shaped surface and the plunger, the wave-shaped surface periodically pushing the rolling element as the drive shaft rotates relative to the housing to drive the plunger to extend and retract within the plunger cavity.

4. The water pump according to claim 2, characterized in that, The rolling element includes a camshaft, which includes a cam portion and a gear structure arranged sequentially in the axial direction. An internal gear is formed on the inner surface of the cavity to mesh with the gear structure. The gear structure meshes with the internal gear to roll inside the internal gear, thereby causing the cam portion to drive the plunger to extend and retract within the plunger cavity.

5. The water pump according to any one of claims 1 to 4, characterized in that, The number of second inlets is multiple and they are distributed circumferentially along the drive shaft. The housing has an annular groove surrounding the second inlet of the water pump. The housing also has a second inlet that connects the annular groove to the external environment.

6. The water pump according to any one of claims 1 to 4, characterized in that, The drive shaft includes a shaft body, which has a first recess and a second recess in the axial direction. The first recess is located on the outlet side, and the second recess is located on the inlet side.

7. The water pump according to claim 6, characterized in that, The drive shaft has a pressure water plate that is embedded in the second recess and is used to position the second valve.

8. The water pump according to claim 6, characterized in that, The drive shaft has a water inlet disc, which is embedded in the first recess and is used to position the first valve.

9. A power assembly, characterized in that, The power unit includes a water pump as described in any one of claims 1 to 8.

10. A tunneling machine, characterized in that, The tunneling machine includes a water pump as described in any one of claims 1 to 8, or a power unit as described in claim 9.

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