CN201786594U - Plunger water pump - Google Patents

Abstract

The utility model provides a plunger type water pump, which mainly includes a cavity, a rotating main shaft and a plunger flow distribution unit. The plunger distribution unit includes a distribution valve assembly, a plunger slipper assembly and a support valve assembly. The plunger slipper assembly divides the chamber into a high-pressure chamber and a low-pressure chamber that are independent of each other. The high-pressure chamber communicates with the distribution valve assembly, and the low-pressure chamber communicates with the support The valve assembly is in fluid communication. The plunger shoe assembly reciprocates under the drive of the rotating main shaft, thereby prompting the distribution valve assembly and the support valve assembly to work together, so that the distribution valve assembly performs water suction and drainage actions through the water pump inlet and water pump outlet, and at the same time makes the support valve assembly flow toward the rotating unit. Provide fluid lubrication. The high-pressure water output by the ultra-high-pressure pump of the utility model is independent of the low-pressure water used for static pressure support and lubrication, which ensures the volumetric efficiency of the water pump under ultra-high pressure conditions and the fluid support and lubrication of the friction pair under high-speed and heavy-load conditions, and improves pump life.

Description

A plunger type water pump

technical field

The utility model relates to a volumetric hydraulic pump, in particular to a plunger type water pump, more specifically to a full water lubricating ultra-high pressure plunger type water pump.

Background technique

With the emergence of the world's energy crisis and the improvement of people's awareness of environmental protection, as well as the special physical and chemical characteristics of the water medium itself, water hydraulic technology has the inability of oil pressure systems in many fields (such as underwater operations, buoyancy adjustment of manned submersibles, etc.). Compared with the advantages, so that the water hydraulic technology has been developed rapidly.

However, since the viscosity of water is about 1/30 to 1/50 of that of commonly used hydraulic oil, it is difficult to form a water film, and the lubricity is poor. At the same time, due to the strong corrosion of water, especially seawater, the choice of materials is limited. The design of the friction pair of the elements brings great difficulties. Therefore, compared with the hydraulic pump, the pressure of the more mature axial hydraulic pump is mainly medium and high pressure, and the pressure is mainly 12-21MPa.

A kind of fully water-lubricated sea/fresh water pump in the prior art adopts a distribution plate to distribute flow, its flow rate is from 10L/min to 170L/min, the pressure reaches 14-16MPa, and the total efficiency is greater than 82%. The structural principle diagram of this series of pumps is as follows As shown in Figure 1, it has the advantages of compact structure, all friction pairs are lubricated by water, and convenient maintenance, but the pump has the following disadvantages:

1. The maximum working pressure is 16MPa, which does not meet the needs of special occasions, such as the requirements of the buoyancy adjustment system of manned submersibles at large depths (diving depths greater than 3000 meters).

2. The distribution plate is used for flow distribution. On the one hand, it is sensitive to pollution and is not suitable for use in open systems. On the other hand, it is difficult to ensure the volumetric efficiency after high pressure.

3. The swash plate sliding shoe mechanism is adopted, and the lateral force of the plunger on the cylinder body is relatively large, and the pair of friction pairs will be severely worn after high pressure.

Higher pressure hydraulic pumps often adopt a crank-connecting rod structure, and the main friction pair adopts an oil-water separation structure lubricated by mineral oil. The hydraulic pump of this structure is currently one of the most widely used ultra-high pressure water pumps in the world, such as the existing technology A three-column pump with a pressure range of 55-275MPa. However, the main problems of the water pump of this structure are as follows:

1) The speed is low (100-500rev/min), large in size and low in power-to-weight ratio; if the speed is increased, the volume of the pump can be reduced, but the seal between the water chamber and the lubricating oil chamber will heat up severely and be prone to failure. Especially in the case of high pressure, this situation will be exacerbated; at the same time, the oil in the sealed lubricating oil chamber will also increase in temperature due to poor heat dissipation, thereby causing oil to deteriorate.

2) It needs to be lubricated with oil, which will inevitably cause oil pollution. In addition, when it is used in a deep sea environment, a pressure compensation device needs to be added, which makes its overall structure complicated.

Utility model content

The purpose of the embodiment of the utility model is to provide a plunger-type water pump, which can realize water lubrication of all friction pairs, and ensure that the pump has high volumetric efficiency and power-to-weight ratio under ultra-high pressure working conditions, and at the same time reduces The friction and wear of the small friction pair under the condition of high speed and heavy load improves the service life of the pump. The pump is suitable for seawater or fresh water as the working medium, and also suitable for other low viscosity fluids as the working medium.

A plunger type water pump provided by an embodiment of the present invention includes a pump main body, a rotating unit and a plunger flow distribution unit, wherein the pump main body includes a cavity, a water pump inlet and a water pump outlet; the rotating unit includes a rotating main shaft, and is located on Inside the pump main body; the plunger flow distribution unit is arranged in the pump main body, the plunger flow distribution unit includes a flow distribution valve assembly, a plunger shoe assembly and a support valve assembly, wherein the plunger shoe assembly is arranged in the cavity , and divide the chamber into independent high-pressure chamber, low-pressure chamber and lubricating chamber, the supporting valve assembly is in fluid communication with the low-pressure chamber, the distribution valve assembly is in fluid communication with the high-pressure chamber, the rotating unit is set in the lubricating chamber and passes through The flow channel and the supporting valve assembly are in fluid communication with the low-pressure chamber, and the plunger shoe assembly is driven by the rotating shaft to reciprocate, thereby promoting the cooperative operation of the distribution valve assembly and the support valve assembly, so that the distribution valve assembly passes through the The water pump inlet and water pump outlet perform suction and discharge actions while allowing the bearing valve assembly to provide fluid lubrication to the rotating unit.

According to a preferred embodiment of the present invention, the distribution valve assembly includes a suction valve and a discharge valve integrally arranged, wherein the inlet of the suction valve is in fluid communication with the inlet of the water pump, and the outlet of the discharge valve is in fluid communication with the outlet of the water pump. In communication, the outlet of the suction valve is in fluid communication with the inlet of the discharge valve.

According to another preferred embodiment of the present invention, the rotating unit further includes a return spring, a return plate and a swash plate sequentially arranged on the rotating main shaft, and the plunger shoe assembly includes a stepped plunger, a connecting rod and a shoe, Wherein the connecting rod is movably connected to the stepped plunger and the sliding shoe at both ends of the connecting rod through a ball joint pair, and a plunger channel is also provided in the cavity, and the stepped plunger is slidably arranged on the column In the plug channel, one side of the return plate is in contact with the return spring, and the other side of the return plate is in contact with the shoe, and under the action of the return spring, the return plate makes the bottom of the shoe tight Attached to the surface of the swash plate, so that the rotary motion of the swash plate is transmitted to the stepped plunger through the sliding shoe and the connecting rod, so that the stepped plunger reciprocates in the plunger channel, and the stepped plunger The small-diameter end and the large-diameter end respectively form the high-pressure chamber and the low-pressure chamber independently of each other with the plunger channel. .

According to yet another preferred embodiment of the present utility model, the plunger shoe assembly further includes a stepped plunger sleeve arranged in the plunger passage, the stepped plunger is arranged in the stepped plunger sleeve, and is connected with the stepped column The sleeve is in direct slidable contact.

According to yet another preferred embodiment of the present utility model, the stepped plunger includes a dimple on its surface and a damping hole arranged radially in fluid communication with the high-pressure chamber, and the dimple communicates with the damping hole.

According to another preferred embodiment of the present invention, the surface of the swash plate in contact with the bottom of the shoe is inlaid with a wear-resistant layer of polymer material, and the wear-resistant layer of polymer material can be PEEK or polytetrafluoroethylene .

According to yet another preferred embodiment of the present utility model, the ball end of the spherical joint formed by the connecting rod and the stepped plunger is clamped by two hemispherical rings. Threaded connection between the plunger or the connecting rod.

According to yet another preferred embodiment of the present invention, the support valve assembly includes a support suction valve and a support discharge valve, the low-pressure chamber is in fluid communication with the outlet of the support suction valve and the inlet of the support discharge valve, and the rotating The unit also includes an axial sliding bearing and a radial sliding bearing cooperating with the rotating main shaft. A fluid channel is respectively arranged inside the rotating main shaft and the pump main body, and the fluid channel makes the pressure-bearing outlet valve slide with the axial direction accordingly. The bearing and the radial slide bearing are in fluid communication, enabling lubrication and support of the axial slide bearing and the radial slide bearing.

According to yet another preferred embodiment of the present utility model, the bottom of the sliding shoe of the plunger shoe assembly is provided with a stepped bearing chamber, and the bearing chamber is in fluid communication with the low-pressure chamber; the rotating unit also includes a The inner damper of the axial sliding bearing is provided with an annular groove on one end surface, and the annular groove is in fluid communication with the damper, and the damper is also connected to the supporting pressure outlet valve through the flow channel provided inside the pump main body The outlet fluid connection.

Embodiments of the utility model include but are not limited to the following technical effects:

1. All the friction pairs of the pump are lubricated by the working medium water, which reduces the volume of the pump, and at the same time makes the heat generated during the pump work taken away by the working medium, ensuring a lower heat balance temperature of the pump; full water lubrication makes The pump does not need to replace lubricating oil regularly, which simplifies maintenance and reduces the cost of use. At the same time, it solves the environmental pollution caused by the possible leakage of lubricating oil, and has the characteristics of environmental friendliness.

2. The two airtight cavities formed between the stepped plunger and the stepped plunger sleeve communicate with the independent distribution valve assembly and support valve assembly respectively, so that the high-pressure water output by the ultra-high pressure pump and the low-pressure water used for hydrostatic support and lubrication Independent of each other, it ensures the volumetric efficiency of the ultra-high pressure water pump under the ultra-high pressure condition and the fluid support and lubrication of the friction pair under the high-speed and heavy-load conditions.

3. Through the dynamic and static pressure mixed fluid support, the serious friction and wear problem of the sliding bearing under the water lubrication condition is solved under the condition of high speed and heavy load, and the full water lubrication of the high pressure water pump is realized. The full water lubricated ultra-high pressure water pump has the advantages of environmental protection and convenient maintenance. Especially when used in deep sea, compared with the oil-water separation high-pressure water pump, there is no need to add a pressure compensator, which simplifies the structure and improves reliability.

4. The driving structure of the swash plate connecting rod reduces the lateral force of the plunger on the stepped plunger sleeve, thereby reducing the wear of the friction pair.

5. The stepped plunger can reduce the contact specific pressure between the ball head of the connecting rod, the plunger and the sliding shoe pair under ultra-high pressure conditions, and increase the fluid bearing area of the sliding shoe, thereby improving the fluid bearing and contact between the sliding shoe and the swash plate. lubricating properties.

6. The spherical dimple located in the plunger also communicates with the high-pressure chamber through a small damping hole, so that a double damping effect is formed between the plunger and the stepped plunger sleeve, preventing the plunger from being stuck and reducing direct wear between the two. The dimples on the surface of the plunger can also reduce the contact stress of the mating surface, limit the movement of abrasive grains and form a local dynamic pressure support, thereby solving the problem of wear of the plunger pair under high-speed and heavy-load conditions, and improving the service life of the ultra-high pressure pump .

7. The flow distribution valve is in the form of an integral component integrating the suction valve and the discharge valve. During maintenance, the components can be quickly replaced to shorten the maintenance time. The distribution valve adopts a ball valve structure, and adopts a combination of soft and hard seals. The valve seat is made of PEEK (polyether ether ketone), and the valve core is made of ceramics. Cracking between seats reduces overall pump noise. The spool is made of engineering ceramics. Because ceramics have the characteristics of high hardness and low density relative to metals, the cavitation resistance is improved, the weight of the spool is reduced, the response characteristics of the distribution valve are improved, and the lag time of the distribution valve is reduced. This improves volumetric efficiency at high speeds.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts. in

Fig. 1 is the structural principle diagram of the plunger pump of prior art;

Fig. 2 is a schematic structural view of a plunger-type water pump according to an embodiment of the present invention, wherein Fig. 2a shows the state corresponding to the minimum volume of the high-pressure chamber, and Fig. 2b shows the state corresponding to the maximum volume of the high-pressure chamber;

Fig. 3 is a schematic structural view of the flow distribution valve assembly of the plunger water pump shown in Fig. 2;

Fig. 4 is a schematic structural view of the plunger shoe assembly of the plunger water pump shown in Fig. 2;

Fig. 5 is a structural schematic diagram of the hemispherical ring of the plunger shoe assembly shown in Fig. 4;

FIG. 6 is a partial structural schematic diagram of the stepped plunger of the plunger shoe assembly shown in FIG. 4 , specifically showing the anti-seize damping structure therein.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

A schematic structural diagram of a plunger water pump according to an embodiment of the present invention is shown in FIG. 2 . The plunger water pump includes modules such as a pump main body, a rotating unit, and a plunger flow distribution unit. Wherein, the pump main body includes a cavity, a water pump inlet and a water pump outlet. The rotary unit comprises a rotary spindle 1 . The plunger distribution unit mainly includes a plunger shoe assembly 24 , a distribution valve assembly 14 and a supporting valve assembly. Wherein the support valve assembly includes a support suction valve 18 and a support discharge valve 19 . The plunger shoe assembly 24 is arranged in the cavity, and the cavity is divided into a high-pressure chamber 17, a low-pressure chamber 20 and a lubricating chamber 7 which are independent of each other. The supporting valve assembly communicates with the low-pressure chamber flow 19, and the distribution valve The component 14 is in fluid communication with the high-pressure chamber 16, and the rotary unit is arranged in the lubricating chamber 7 and communicates with the low-pressure chamber in fluid communication with the supporting valve assembly through the flow channel.

As shown in the figure, the main body of the pump is mainly composed of an end cover 11 , a cylinder body 10 and a casing 3 . One end of the cylinder body 10 is connected to the housing 3 , and the other end is provided with an end cover 11 . The end cover 11 , the cylinder body 10 and the cavity in the housing 3 together form the above-mentioned cavity. The rotating main shaft 1 is fixed in the lubricating chamber 7 formed by the cylinder block 10 and the housing 3 . With the rotating main shaft 1 as the center, there are a plurality of plunger flow distribution units (generally 3 to 7, the specific number is determined according to the different requirements for the flow pulsation of the hydraulic pump in different use environments) evenly distributed along the same circumference. The specific structure and working process will be described in detail below.

The left end surface of the rear end cover 11 is processed with two threaded holes, which are respectively the inlet and outlet of the ultra-high pressure water pump, and the right end surface is processed with a flow hole 12 and an annular flow groove 15 . In the radial direction of the rear end cover 11, there are stepped holes equal to the number of plunger flow distribution units. The outside of the stepped holes is processed with threads for the installation and fixing of the flow distribution valve assembly 14. After the flow distribution valve assembly is installed in place, install it again. The locking nut 13 locks the distribution valve assembly 14 to prevent the distribution valve assembly 14 from loosening under the action of hydraulic pressure circulation, and improves the reliability of the sea/fresh pump when used underwater.

The distribution valve assembly is shown in Fig. 3, comprises valve body 29, suction valve and pressure-out valve, and the entrance of suction valve communicates with the inlet of water pump through annular flow groove 15, and the outlet of suction valve communicates with the entrance of pressure-out valve, and pressure-out valve The outlet of the pump communicates with the outlet of the water pump. The upper part of valve body 29 among the figure is equipped with an extruding valve, and the lower part is equipped with a suction valve. The extrusion valve from top to bottom is the extrusion valve lock nut 37, the extrusion valve spring 36, the extrusion valve spool 35, and the extrusion valve seat 34, and the suction valve is the suction valve spring 33, A suction valve spool 32, a suction valve seat 31, and a suction valve lock nut 30. The connection between the pressure-out valve and the suction valve serves as both the outlet of the suction valve and the inlet of the pressure-out valve. The suction valve and the discharge valve are designed in the form of components, and the distribution valve components can be replaced as a whole during maintenance, so that the MTTR (Mean Time To Repair) of failures is reduced and the maintenance on site is improved. sex.

The distribution valve assembly adopts radial arrangement, which reduces the axial size of the water pump and improves the power-to-weight ratio. The sealing form of the distribution valve adopts ball valves, and at the same time adopts soft and hard matching, the valve seat is PEEK, the valve core is ceramic, and the structure is simple, which not only improves the sealing reliability under high pressure conditions, but also reduces the impact between the valve core and the valve seat sound, thereby reducing the overall noise of the pump. The spool is made of ceramics. Compared with metals, ceramics have the characteristics of high hardness and low density, so the anti-cavitation ability is improved; at the same time, it is beneficial to reduce the weight of the spool, improve the response characteristics of the distribution valve, and reduce the lag time of the distribution valve. , thereby improving volumetric efficiency at high speeds.

The cylinder body 10 is processed with a flow channel 9, so that the inlet of the water pump communicates with the lubricating chamber. The cylinder body 10 is processed with the same stepped holes as the plunger in the axial direction, and has twice the number of stepped holes as the plunger in the radial direction, and a group of two of them communicates with the axial steps. A stepped plunger sleeve 8 is installed in the axially stepped hole, and each group of radially distributed stepped holes is used to install the support suction valve 18 and the support discharge valve 18 respectively, and the inlet of the support suction valve 18 passes through the flow channel 16, the rear end The annular flow groove 15 of the cover communicates with the inlet of the ultra-high pressure seawater pump. A stepped plunger assembly 24 is installed in the stepped plunger sleeve 8 , as shown in FIG. 4 . The stepped plunger assembly 24 includes a stepped plunger 38 , a hemispherical ring 40 , a connecting rod 39 and a shoe 41 . The connecting rod 39 is processed with an elongated damping hole communicating with the bottom support cavity 44 of the sliding shoe 41, and the support cavity 44 is a multi-stage stepped structure. There is a stepped threaded hole at the larger diameter end of the stepped plunger, and a ball socket is processed at the bottom of the threaded hole. Each plunger assembly 24 has two hemispherical rings 40, as shown in Figure 5, the two are cut and formed two parts by the parts that have processed external thread and ball socket in advance, and its external thread and the internal thread of plunger To cooperate, the ball socket is matched with the ball head of the connecting rod. The two ends of the connecting rod 39 are ball heads of different sizes. The small ball head is matched with the inner ball socket of the plunger, and then a pair of hemispherical rings are screwed into the threads of the stepped plunger 38 to connect the connecting rod with the stepped plunger 38. A spherical joint is formed between the two. This structure eliminates the plastic deformation on the plunger surface when the small ball head of the connecting rod and the plunger are installed by the common rolling method, improves the matching accuracy between the plunger surface and the plunger hole, and improves the sealing and friction performance. improve. The large ball head of the connecting rod cooperates with the ball socket of the shoe, and the two can be connected by rolling forming to form a ball joint pair. The surface of the smaller diameter end of the stepped plunger 38 is processed with a spherical dimple 43 and a small damping hole 42, as shown in FIG. 6 .

The driving structure of the swash plate connecting rod is mainly to reduce the lateral force between the stepped plunger 38 and the stepped plunger sleeve 8 and the bending moment on the stepped plunger 38 . The chamber between the small-diameter end of the plunger and the stepped plunger sleeve 8 is a high-pressure chamber 17, and the pressure water in this chamber communicates with the outlet of the water pump through the distribution valve on the end cover to output ultra-high pressure water; while the large-diameter end of the plunger A low-pressure chamber 20 is formed between the stepped plunger sleeve 8, and the low-pressure chamber 20 communicates with the supporting chamber 44 of the sliding shoe 41 to realize the hydrostatic support between the sliding shoe 41 and the swash plate. The dynamic pressure support produced by the stepped support cavity 44 works together to improve the support performance between the sliding shoe and the swash plate, and the water medium used for support flows into the lubricating cavity 7 through the axial gap between the sliding shoe 41 and the swash plate (as shown in Figure 2 shown), while the lubricating chamber communicates with the pump inlet. The low-pressure chamber 20 also communicates with the outlet of the support suction valve 18 and the inlet of the support discharge valve 19, through which the support discharge valve 19 provides pressure support for the axial sliding bearing 6, radial sliding bearing 5 and 21, and realizes dynamic and static pressure mixed support and lubricated. The spherical pit 43 on the surface of the stepped plunger 38 communicates with the high-pressure chamber 17 through the small damping hole 42 and a row of pits located at the head of the stepped plunger, so that a double damping effect is formed between the stepped plunger 38 and the stepped plunger sleeve 8 , which solves the problem of plunger jamming caused by reducing the gap between the stepped plunger sleeve 8 and the stepped plunger 38 in order to improve the volumetric efficiency of the ultrahigh pressure pump, and reduces the probability of direct contact between the two. These dimples not only reduce the contact stress of the mating surface, limit the movement of abrasive particles, but also form a local dynamic pressure support. The wear problem of the plunger pair under the condition of high speed and heavy load is solved by means of connecting rod mechanism, secondary damping, surface topography design and other methods.

The left end of the rotary spindle 1 is connected to the cylinder body 10 through radial sliding bearings 21 , the right end is connected to the housing 3 through the axial sliding bearing 6 and the radial sliding bearing 5 , and protrudes from the housing 3 through the mechanical seal 2 . The left end surface of the axial sliding bearing 6 is provided with an annular groove and a spherical pit, and the annular groove communicates with the damper 4, and the damper 4 communicates with the outlet of the support extrusion valve 19 through the flow channel 27 on the housing 3, and passes through the damper 4. The supporting pressure of the axial sliding bearing 6 can be changed with the load. A flow channel 28 is processed on the rotating main shaft 1, so that the pressure water can flow to the radial sliding bearing 5 and 21 through the inner side of the axial sliding bearing 6 to provide pressure support, lubrication and cooling, and this part of the water medium used for lubrication and cooling The general axial sliding bearing 6 and the radial sliding bearing 5 and 21 flow into the lubricating cavity 7 formed by the casing 3 and the cylinder block 10, and flow to the inlet of the pump through the flow channel 9 communicating with the lubricating cavity on the cylinder block. The radial sliding bearings 5 and 21 are designed as eccentric structures, and under the action of medium water, dynamic pressure is formed to realize mixed support and lubrication of dynamic pressure. A swash plate 25 with a certain inclination angle (7-15 degrees) is processed on the rotating main shaft 1, and the left side of the swash plate is inlaid with a polymer material (such as PEEK, polytetrafluoroethylene), so that the polymer material directly contacts with the sliding shaft. The boots are in contact, improving the frictional properties of both.

The working process of the ultra-high pressure water pump is realized as follows: the rotating main shaft 1 rotates clockwise or counterclockwise, and the swash plate 25 rotates together with the rotating main shaft. The return spring 22 exerts an active force evenly on the sliding shoe 41 through the ball joint 26 and the return plate 23, so that the sliding shoe 41 slides closely against the swash plate. The stepped plunger 38 receives the action force from the swash plate 25 to the sliding shoe through the connecting rod 39 , so that the stepped plunger 38 reciprocates in the stepped plunger sleeve 8 . When the swash plate starts to move along the limit position, that is, the position where the volume of the high-pressure chamber 17 is the smallest (as shown in FIG. 2 a ), the ejection valve spool 35 of the distribution valve assembly 14 is in a closed state. The sliding shoe 41 drives the stepped plunger 38 to move to the right under the pressing force of the return plate 23, the volume of the closed high-pressure chamber 17 gradually increases, and the pressure drops. When the pressure was greater than the resultant force of the pressure in the high-pressure chamber 17 and the spring force of the suction valve, the suction valve was opened, and water entered the suction valve inlet by the water pump inlet and then flowed into the high-pressure chamber 17 to realize water absorption. When the swash plate reaches the position shown in FIG. 2b after turning 180° from the limit position shown in FIG. 2a, the volume of the high-pressure chamber 17 is the largest. At this time, the stepped plunger 38 is in a fully extended state. The rotating main shaft 1 continues to rotate, and the sliding shoe 41 is forced by the swash plate 25 to push the plunger 39 to move to the left, the volume of the high-pressure chamber 17 gradually decreases, the pressure in the high-pressure chamber rises, and the suction valve is closed. Overcoming the resultant force of the force of the extrusion valve spring 36 and the pressure of the water pump outlet, the extrusion valve core 35 is opened, so that the high-pressure water in the high pressure chamber 17 flows out of the water pump outlet through the outlet of the extrusion valve to realize drainage. When the rotating main shaft rotates once, each plunger absorbs water and discharges water once, and with the continuous rotation of the rotating main shaft, each plunger also completes the action of absorbing water and draining water independently continuously, so that the pump continuously outputs flow. During the 360° rotation of the main shaft, the low-pressure chamber 20 formed by the stepped plunger 38 and the stepped plunger sleeve 8 is also changing accordingly. When the volume becomes larger, it absorbs water through the support suction valve 18. When the volume becomes smaller, a part The pressure water flows into the connecting rod ball joint pair through the flow channel, and flows into the bottom of the sliding shoe 41 through the connecting rod to support the sliding shoe; the other part of the pressure water flows through the flow channel 27 on the cylinder body to the damper 4, and passes through the damper 4 flows into the annular groove of the axial sliding bearing 6 to play the role of support and lubrication. The pressure water flowing out from the inner side of the axial sliding bearing 6 passes through the flow channel 28 in the rotating main shaft, and flows to the left and right radial sliding bearings 5 and 21 to provide static pressure support, and the dynamic pressure support of the radial bearing itself realizes dynamic and static pressure. Mix bearing and lubrication.

The above is a corresponding introduction for a preferred embodiment of the present utility model. It should be noted that there may be many modifications to the above embodiments. For example, the stepped plunger sleeve 8 can be omitted, and the stepped plunger 38 can be directly placed in the corresponding plunger channel in the cavity. In addition, the large-diameter end of the stepped plunger 38 in the plunger shoe assembly 24 shown in FIG. , not limited to this, the ball head can also be arranged on the stepped plunger 36, and the corresponding earth socket is arranged on the connecting rod. At this time, a threaded connection between the hemispherical ring 40 and the connecting rod 39 is required. In addition, although the embodiment of the present invention is described with a high-pressure full-water lubricated water pump. However, the present invention is not limited thereto, and the embodiments of the present invention can be applied to plunger pumps that are not fully lubricated by water, and even the pressure is not very high. Specifically, the scope covered by the claims shall prevail.

In the above embodiments, the utility model is only described as an example, but those skilled in the art can make various modifications to the utility model without departing from the spirit and scope of the utility model after reading this patent application.

Claims (10)

1. A plunger type water pump, comprising: a pump main body, the pump main body includes a cavity, a water pump inlet and a water pump outlet; a rotation unit including a rotation main shaft and provided in the pump body; and A plunger flow distribution unit, the plunger flow distribution unit is arranged in the pump main body, the plunger flow distribution unit includes a flow distribution valve assembly, a plunger shoe assembly and a support valve assembly, Wherein, the plunger shoe assembly is arranged in the cavity, and the cavity is divided into a high-pressure cavity, a low-pressure cavity, and a lubricating cavity that are independent of each other, the support valve assembly is in fluid communication with the low-pressure cavity, and the The distribution valve assembly is in fluid communication with the high-pressure chamber, the rotating unit is arranged in the lubrication chamber and communicates with the low-pressure chamber through the flow channel and the support valve assembly, Wherein, the plunger shoe assembly reciprocates under the drive of the rotating main shaft, thereby prompting the cooperative operation of the distribution valve assembly and the support valve assembly, so that the distribution valve assembly passes through the water pump inlet and the water pump outlet. Suction and drainage actions simultaneously cause the bearing valve assembly to provide fluid lubrication to the swivel unit. 2. The plunger type water pump according to claim 1, wherein the distribution valve assembly comprises a suction valve and a pressure discharge valve integrally arranged, wherein the inlet of the suction valve is in fluid communication with the inlet of the water pump, The outlet of the push-out valve is in fluid communication with the water pump outlet, and the outlet of the suction valve is in fluid communication with the inlet of the push-out valve. 3. The plunger type water pump according to claim 1, characterized in that, The rotating unit also includes a return spring, a return plate and a swash plate arranged on the rotating main shaft in sequence, The plunger shoe assembly includes a stepped plunger, a connecting rod and a shoe, wherein the connecting rod is movably connected to the ladder plunger and the shoe at both ends of the connecting rod through a ball joint pair , A plunger channel is also provided in the cavity, and the stepped plunger is slidably arranged in the plunger channel, Wherein, one side of the return disc is in contact with the return spring, and the other side of the return disc is in contact with the sliding shoe, and under the action of the return spring, the return disc makes the sliding shoe The bottom of the swash plate is close to the surface of the swash plate, so that the rotation of the swash plate is transmitted to the stepped plunger through the sliding shoe and the connecting rod, so that the stepped plunger The small-diameter end and the large-diameter end of the stepped plunger form the high-pressure chamber and the low-pressure chamber independently of each other with the plunger passage respectively. 4. The plunger type water pump according to claim 3, wherein the plunger shoe assembly further comprises a stepped plunger sleeve disposed in the plunger passage, the stepped plunger is disposed in the plunger channel. The stepped plunger sleeve is in direct slidable contact with the stepped plunger sleeve. 5. The plunger-type water pump according to claim 4, characterized in that, the stepped plunger comprises a dimple on its surface and a radially arranged damping hole in fluid communication with the high-pressure chamber, the dimple The pit communicates with the damping hole. 6. The plunger-type water pump according to claim 3, characterized in that, the surface of the swash plate in contact with the bottom of the sliding shoe is inlaid with a polymer material wear-resistant layer. 7. The plunger-type water pump according to claim 6, characterized in that, the wear-resistant layer of polymer material is PEEK or polytetrafluoroethylene. 8. The plunger-type water pump according to claim 3, characterized in that, the ball end of the spherical joint formed by the connecting rod and the stepped plunger is clamped by two hemispherical rings, and the surface of the hemispherical rings Threads are processed, and the hemispherical ring is threadedly connected with the stepped plunger or the connecting rod. 9. The plunger water pump according to any one of claims 1-8, characterized in that, the bearing valve assembly includes a bearing suction valve and a bearing pressure discharge valve, the low pressure chamber being in fluid communication with the outlet of the bearing suction valve and the inlet of the bearing pressure discharge valve, The rotating unit also includes an axial sliding bearing and a radial sliding bearing cooperating with the rotating main shaft, The interior of the rotating main shaft and the pump main body are respectively provided with fluid passages, and the fluid passages correspondingly make the bearing pressure outlet valve maintain fluid communication with the axial sliding bearing and the radial sliding bearing, so as to realize the Lubrication and support of the axial plain bearing and the radial plain bearing. 10. The plunger type water pump according to claim 9, characterized in that, The bottom of the slide shoe of the plunger shoe assembly is provided with a stepped support cavity, and the support cavity is in fluid communication with the low-pressure cavity; The rotary unit also includes a damper disposed inside the pump body, an annular groove is provided on one end surface of the axial sliding bearing, and the annular groove is in fluid communication with the damper, and the damper also passes through A flow channel provided inside the pump body is in fluid communication with the outlet of the support push-out valve.

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