High-durability swash plate plunger water pump

Abstract

The high-durability swash plate plunger water pump comprises a shell, a main shaft, a cylinder body, a swash plate and a return plate, a floating plate and a valve plate are arranged on the right side of the cylinder body, a plunger is installed in the cylinder body in a sliding mode, the end of the plunger is installed on the return plate through a sliding shoe, a front end cover is arranged on the left side of the shell, and a rear tail cover is arranged on the right side of the shell; the main shaft extends from the front end cover, penetrates through the shell and extends into the rear tail cover, a front shaft seal is arranged at the left end of the main shaft, and a rear shaft seal is arranged at the right end of the main shaft; a front support bearing is mounted on the front end cover and positioned on the outer side of the front shaft seal; a rear supporting bearing is installed on the rear tail cover and located on the outer side of the rear shaft seal, a bearing supporting part is independent from a medium, the rolling bearing has better supporting performance, the rotating state of a main shaft, a cylinder body and other components can be effectively improved, vibration is reduced, meanwhile, the rolling bearing has the axial limiting capacity, movement of the main shaft is reduced, and internal leakage of the water pump is reduced.

Description

Technical Field

[0001] The invention relates to the field of fluids, and in particular to a high-durability inclined plate plunger water pump. Background Art

[0002] Water pumps are usually used to transport high-pressure, low-viscosity corrosive fluid media. Axial piston water pumps are a typical application in seawater reverse osmosis treatment processes. Because the transported medium is corrosive to a certain extent and the application conditions are special, the various parts of the water pump need to have a long maintenance cycle. While meeting the requirements of high-efficiency, high-pressure transportation, it also needs to have high reliability and a long life.

[0003] The structures of water pumps used in the prior art are mostly improved from quantitative pumps for conveying hydraulic oil. The use environment of oil pumps is much better than that of water pumps. Therefore, the existing water pumps have the characteristics of low reliability and high failure rate. In order to avoid the influence of corrosive media such as seawater on bearings, the support of moving components in existing water pumps is mostly supported by sliding bearings. However, on the one hand, the sliding support has weak support, and the moving parts may still have vibration or abnormal wear and other faults when they are working and rotating. On the other hand, the sliding bearing does not have the ability to limit axially, which causes a certain amount of string movement of the main shaft during operation, resulting in a large amount of leakage in the water pump system. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the sliding bearings used in existing water pumps have weak supporting performance and cannot be axially positioned, resulting in large spindle stringing and large internal leakage of the water pump. The present invention provides a high-durability swash plate plunger water pump to solve the above problem.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a high-durability swash plate plunger water pump, comprising a housing, a main shaft arranged in the housing, a cylinder body arranged in the housing and sleeved on the main shaft, a swash plate arranged on the left side of the cylinder body, a return plate slidably fitted on the swash plate, a floating plate and a distribution plate are arranged on the right side of the cylinder body, a plunger is slidably installed in the cylinder body, and the end of the plunger is installed on the return plate through a sliding shoe, a front end cover is arranged on the left side of the housing, and a rear tail cover is arranged on the right side of the housing; the main shaft extends from the front end cover, passes through the housing and extends into the rear tail cover, a front shaft seal is arranged on the left end of the main shaft, and a rear shaft seal is arranged on the right end; a front support bearing is installed on the front end cover at the outside of the front shaft seal; a rear support bearing is installed on the rear tail cover at the outside of the rear shaft seal.

[0006] Furthermore: the front support bearing and the rear support bearing are ball bearings.

[0007] Furthermore: a ball joint is slidably mounted on the main shaft, a mounting hole is penetrated on the upper side of the cylinder body, a push rod and a spring are axially arranged in the mounting hole, and the spring drives the push rod to push the ball joint so that the return plate is tightly attached to the inclined plate.

[0008] Furthermore: a sliding ring is embedded in the center of the ball joint, the sliding ring is sleeved and installed on the outer periphery of the main shaft, and the material of the sliding ring is polyetheretherketone.

[0009] Furthermore: a front bearing seat is arranged on the front end cover, and the front support bearing is installed in the front bearing seat; on the front bearing seat, a dust cover is installed on the outer side of the front support bearing, and the dust cover is provided with a dust ring which is in sealing contact with the main shaft.

[0010] Furthermore: a rear bearing seat is arranged on the rear tail cover, and the rear support bearing is installed in the rear bearing seat; a rear cover is installed on the rear bearing seat at the outer side of the rear support bearing.

[0011] The beneficial effect of the present invention is that the high-durability swash plate plunger water pump of the present invention separates the bearing support part from the medium, adopts rolling bearings to replace the sliding bearings of the existing water pump, isolates the corrosion of the medium to the bearing support parts or the abnormal wear caused by impurities, and improves the bearing support life. The rolling bearing has better supporting performance, which can effectively improve the rotation state of the main shaft, cylinder body and other parts and reduce vibration. At the same time, the rolling bearing has axial limiting ability, reduces the string movement of the main shaft and reduces the internal leakage of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a full cross-sectional view of a high-durability swash plate plunger water pump of the present invention; In the figure, 1, housing, 2, main shaft, 3, cylinder block, 4, swash plate, 5, return plate, 6, floating plate, 7, distribution plate, 8, plunger, 9, front end cover, 10, rear tail cover, 11, front shaft seal, 12, rear shaft seal, 13, front support bearing, 14, rear support bearing, 15, ball joint, 16, mounting hole, 17, push rod, 18, spring, 19, sliding ring, 20, front bearing seat, 21, dust cover, 22, dust ring, 23, rear bearing seat, 24, rear cover. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0015] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0016] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0017] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0018] like Figure 1As shown, the present invention provides a high-durability swash plate plunger water pump, comprising a housing 1, a main shaft 2 arranged in the housing 1, a cylinder body 3 arranged in the housing 1 and sleeved on the main shaft 2, a swash plate 4 arranged on the left side of the cylinder body 3, and a return plate 5 slidably fitted on the swash plate 4, a floating plate 6 and a distribution plate 7 are arranged on the right side of the cylinder body 3, a plunger 8 is slidably installed in the cylinder body 3, and the end of the plunger 8 is installed on the return plate 5 through a sliding shoe, a front end cover 9 is arranged on the left side of the housing 1, and a rear tail cover 10 is arranged on the right side of the housing 1; the main shaft 2 extends from the front end cover 9, passes through the housing 1 and extends into the rear tail cover 10, and a front shaft seal 11 is arranged on the left end of the main shaft 2, and a rear shaft seal 12 is arranged on the right end; a front support bearing 13 is installed on the front end cover 9 at the outside of the front shaft seal 11; a rear support bearing 14 is installed on the rear tail cover 10 at the outside of the rear shaft seal 12.

[0019] The front support bearing 13 and the rear support bearing 14 are ball bearings. The high-durability swash plate plunger water pump disclosed in the present application adopts a ball bearing support structure at both ends of the main shaft 2. Compared with the traditional sliding bearing support, this support structure has better centering and support, can ensure the stability of the main shaft 2 when it moves at high speed, and improve the vibration during the operation of the water pump.

[0020] At the same time, in addition to the reliable radial support effect of the ball bearings at both ends, the structure of the ball bearings in this application can also provide a higher axial limiting ability for the main shaft 2, which can effectively reduce the axial transmission of the main shaft 2. During the movement, the contact between the inclined plate 4 and the sliding shoe and the sealing state of dynamic sealing parts such as the cylinder body 3 and the distribution plate 7 are more stable and reliable, reducing the leakage inside the pump.

[0021] Since the medium transported in the present application is water, in order to match the structure of the ball bearing supports at both ends of the present application, the present application adopts a structure in which a front shaft seal 11 is set at the left end of the main shaft 2 and a rear shaft seal 12 is set at the right end of the main shaft 2. The water medium in the housing 1 is confined to the internal space of the housing 1 between the front shaft seal 11 and the rear shaft seal 12, and the front support bearing 13 and the rear support bearing 14 are both set outside the influence range of the water medium. This can avoid water erosion and influence on the bearings, and can make the ball bearings at this location have a better operating environment, avoid rust and pollution from pollutants in the water medium, and greatly extend the service life of the bearings.

[0022] A ball joint 15 is slidably mounted on the main shaft 2, a mounting hole 16 is penetrated on the cylinder body 3, a push rod 17 and a spring 18 are axially arranged in the mounting hole 16, and the spring 18 drives the push rod 17 to push the ball joint 15 so that the return plate 5 is tightly attached to the swash plate 4.

[0023] A pushing structure of the ball joint 15 is arranged in the mounting hole 16. Compared with the prior art in which the anti-rotation rod and the spring 18 are installed separately, the push rod 17 can fully produce the function of anti-rotation and pushing the ball joint 15 during installation, thereby preventing the spring 18 from receiving additional adverse tangential torsional force during rotation, improving the force environment of the spring 18, effectively preventing the spring 18 from getting stuck and other adverse phenomena, and improving the reliability of the water pump.

[0024] At the same time, in the present application, the mounting hole 16 in the cylinder body 3 is a through-hole structure, one end of the spring 18 pushes the ball joint 15 through the push rod 17, and the other end directly pushes the floating plate 6. In this way, the left side of the floating plate 6 does not directly bear the side pressure of the cylinder body 3, but only receives the pushing pressure of the spring 18. The floating of the floating plate 6 is more flexible and free, and has a better sealing and fitting effect with the distribution plate, and the leakage inside the water pump is lower, thereby improving the efficiency of the water pump.

[0025] A sliding ring 19 is embedded in the center of the ball joint 15, and the sliding ring 19 is sleeved and installed on the outer periphery of the main shaft 2. The sliding ring 19 is made of polyetheretherketone. The use of the sliding ring 19 can reduce the friction coefficient of the ball joint 15 along the axial movement. Polyetheretherketone is also called PEEK, which has good wear resistance and self-lubricating ability and can adapt to water media. This structure is conducive to better pressing the return plate 5 and improving the reliability of the water pump.

[0026] The front end cover 9 is provided with a front bearing seat 20, and the front support bearing 13 is installed in the front bearing seat 20; on the front bearing seat 20, a dust cover 21 is installed on the outer side of the front support bearing 13, and the dust cover 21 is provided with a dust ring 22 which is in sealing contact with the main shaft 2.

[0027] The rear tail cover 10 is provided with a rear bearing seat 23 , and the rear support bearing 14 is installed in the rear bearing seat 23 ; a rear cover 24 is installed on the rear bearing seat 23 and located outside the rear support bearing 14 .

[0028] The split installation of the front bearing seat 20 and the rear bearing seat 23 can reduce the manufacturing difficulty and improve the processing accuracy of local key parts. On the other hand, it can make the water pump have higher assembly performance, which is convenient for early assembly and later maintenance. The use of dust cover 21, dust ring 22, rear cover 24 and other components can make the front support bearing 13 and the rear support bearing 14 have a better working environment to prevent external dust and water vapor from entering and causing bearing damage. This structure improves the overall reliability of the water pump.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0030] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-durability swash plate plunger water pump, comprising a housing (1), a main shaft (2) arranged in the housing (1), a cylinder (3) arranged in the housing (1) and sleeved on the main shaft (2), a swash plate (4) arranged on the left side of the cylinder (3), a return plate (5) slidably mounted on the swash plate (4), a floating plate (6) and a distribution plate (7) being arranged on the right side of the cylinder (3), a plunger (8) being slidably mounted in the cylinder (3), an end of the plunger (8) being mounted on the return plate (5) via a sliding shoe, characterized in that: A front end cover (9) is arranged on the left side of the housing (1), and a rear end cover (10) is arranged on the right side of the housing (1); the main shaft (2) extends from the front end cover (9), passes through the housing (1) and extends into the rear end cover (10); a front shaft seal (11) is arranged on the left end of the main shaft (2), and a rear shaft seal (12) is arranged on the right end; a front support bearing (13) is installed on the front end cover (9) outside the front shaft seal (11); and a rear support bearing (14) is installed on the rear end cover (10) outside the rear shaft seal (12).

2. A high-durability swash plate plunger water pump according to claim 1, characterized in that: The front support bearing (13) and the rear support bearing (14) are ball bearings.

3. A high-durability swash plate plunger water pump according to claim 1, characterized in that: A ball joint (15) is slidably mounted on the main shaft (2), a mounting hole (16) is penetrated through the cylinder body (3), a push rod (17) and a spring (18) are axially arranged in the mounting hole (16), and the spring (18) drives the push rod (17) to push the ball joint (15) so that the return plate (5) is tightly attached to the swash plate (4).

4. A high-durability swash plate plunger water pump as claimed in claim 3, characterized in that: A sliding ring (19) is embedded in the center of the ball joint (15), and the sliding ring (19) is sleeved and installed on the outer periphery of the main shaft (2). The material of the sliding ring (19) is polyetheretherketone.

5. A high-durability swash plate plunger water pump as claimed in claim 1, characterized in that: A front bearing seat (20) is arranged on the front end cover (9), and the front support bearing (13) is installed in the front bearing seat (20); a dust cover (21) is installed on the front bearing seat (20) at the outer side of the front support bearing (13), and a dust ring (22) is arranged on the dust cover (21) for sealing contact with the main shaft (2).

6. A high-durability swash plate plunger water pump as claimed in claim 1, characterized in that: The rear tail cover (10) is provided with a rear bearing seat (23), and the rear support bearing (14) is installed in the rear bearing seat (23); and a rear cover (24) is installed on the rear bearing seat (23) at the outer side of the rear support bearing (14).

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