High-pressure water pump based on water or aqueous solution lubrication

Abstract

The utility model relates to the technical field of high-pressure water pumps, and discloses a high-pressure water pump based on water or aqueous solution lubrication, which comprises a hydraulic cylinder component, a shell, a plunger and a driving component. The hydraulic cylinder body assembly comprises a first main body structure and a second main body structure, the first main body structure is connected with the shell, a containing space is formed in the first main body structure, and the second main body structure, the plunger and the driving assembly are arranged in the containing space. The first main body structure is internally provided with paired one-way valve cavities and a fluid channel for communicating the two cavities; plunger cavities matched with the plungers in a one-to-one correspondence mode are formed in the second main body structure, the fluid channels communicate with the plunger cavities, and one plunger corresponds to one pair of one-way valves. The first main body structure is made of copper alloy or aluminum alloy, and the second main body structure is made of stainless steel or cast iron. According to the high-pressure water pump, the hydraulic cylinder body assembly is of a split type structure, the first main body structure and the second main body structure are made of different materials, the overall manufacturing cost is reduced, and meanwhile the high-performance index of the pump is guaranteed.

Description

Technical Field

[0001] The utility model relates to a high-pressure water pump based on water or aqueous solution lubrication. Background Art

[0002] Water-lubricated high-pressure water pumps are a new technology currently under development. Unlike reciprocating pumps that use lubricating oil to lubricate the power end, water-lubricated high-pressure water pumps do not require lubricating oil for their drive components. Through special structural design, they only need water or aqueous solution to solve the lubrication problem of power components and operate efficiently. Since water-lubricated high-pressure water pumps do not require lubricating oil, they avoid environmental pollution and can achieve a longer maintenance-free life. They can be widely used in high-pressure cleaning, high-pressure fogging, fine mist fire extinguishing, seawater desalination, high-pressure deburring and other fields.

[0003] Among them, the cylinder body (also called the pump head) is the component in the water pump that withstands high pressure. There are high and low pressure fluid channels and a one-way valve in the cylinder body. One plunger corresponds to a suction valve and a discharge valve to realize fluid distribution, thereby realizing the inflow of low-pressure water and the output of high-pressure water. A plunger cavity is also provided in the cylinder body, and the plunger slides in the plunger cavity to increase the water pressure.

[0004] As a key component of a water-lubricated high-pressure water pump, the weight of the liquid cylinder body accounts for a high proportion of the total pump weight. The material used for the main structure of the liquid cylinder body needs to be corrosion-resistant and have good strength to withstand high pressure. Copper alloy and stainless steel are the most suitable materials. For the manufacture of the liquid cylinder body, an integral structure is currently used (that is, the plunger cavity and the distribution valve chamber are manufactured on the same continuous material). Although the price of copper alloy materials is relatively high, the low hardness makes it easy to form and process, which makes the total cost lower than that of the liquid cylinder body made of stainless steel. A very small gap is used between the plunger and the plunger cavity of a water-lubricated high-pressure water pump to seal the high-pressure water. Under the pressurized state, the high pressure of the water causes the diameter of the plunger cavity to expand. The expansion of the diameter means an increase in the sealing gap and an increase in flow leakage; and the size of the plunger cavity diameter expanded by water pressure is proportional to the elastic modulus of the material used for the plunger cavity. Since the elastic modulus of copper alloy is about 1 / 2 of that of stainless steel, it means that the diameter sealing gap caused by water pressure will increase significantly; for high-pressure water pressurization applications, the integral liquid cylinder body made of copper alloy is likely to reduce pump performance, while the integral liquid cylinder body made of stainless steel significantly increases the manufacturing cost.

[0005] The manufacturing cost of the hydraulic cylinder, the core component of the water-lubricated high-pressure water pump, accounts for more than 30% of the total cost of the pump. In order to solve the problem of product commercialization, it is urgent to solve the problem of how to reduce the manufacturing cost of the high-pressure water pump and ensure good performance. Utility Model Content

[0006] The purpose of the utility model is to provide a high-pressure water pump based on water or aqueous solution lubrication. The high-pressure water pump based on water or aqueous solution lubrication is configured as a split structure for a liquid cylinder body. The first main structure and the second main structure are respectively manufactured using different materials according to their own structural characteristics and performance requirements. Compared with the integral liquid cylinder body structure in the prior art, the manufacturing cost is significantly reduced, and the high performance indicators of the pump are guaranteed to be achieved.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] A high-pressure water pump based on water or aqueous solution lubrication, comprising: a cylinder assembly, a housing, at least one plunger, and a drive assembly;

[0009] The liquid cylinder assembly comprises a first main body structure and a second main body structure which are fixedly connected, the housing is fixedly connected to the first main body structure, a receiving space is formed inside the housing, the second main body structure is located in the receiving space, and the receiving space is used to be filled with water or an aqueous solution;

[0010] The second main body structure is provided with a plunger cavity corresponding to and cooperating with the plunger one by one, the plunger cavity passes through the second main body structure, one end of the plunger extends into the plunger cavity, and the other end is connected to the drive assembly, the drive assembly is located in the housing, and is used to drive the plunger to reciprocate in the plunger cavity;

[0011] The first main structure is provided with one-way valves corresponding to the plunger cavities and arranged in pairs, each pair of one-way valves includes a water suction valve and a water discharge valve; for each pair of one-way valves and plunger cavities corresponding to each other, the first main structure is provided with a first chamber for accommodating and installing the water suction valve, a second chamber for accommodating and installing the water discharge valve, a fluid channel connecting the first chamber and the second chamber, and a connecting hole; one end of the fluid channel is connected to the liquid outlet of the water suction valve, and the other end is connected to the liquid inlet of the water discharge valve; the plunger cavity is connected to the fluid channel through the connecting hole;

[0012] The first main body structure is made of copper alloy material or aluminum alloy material, and the second main body structure is made of stainless steel material or cast iron material.

[0013] In the above-mentioned high-pressure water pump based on water or aqueous solution lubrication, the cylinder assembly is connected to the housing, the plunger and the driving assembly for driving the plunger to reciprocate in the plunger cavity are arranged in the housing, the housing is provided with a pump body water inlet, and the space in the housing is also used to fill water or aqueous solution, the water or aqueous solution can lubricate the components in the driving assembly, and can also dissipate heat and cool the components in the driving assembly, so that the driving components do not need lubrication with lubricating oil, avoid environmental pollution, and achieve a longer maintenance-free life; wherein, the cylinder assembly is the main pressure-bearing component in the water pump, and there are many channels for fluid circulation and chambers for setting components in the cylinder assembly, etc., according to the processing requirements of different parts of the cylinder assembly, and combined with cost and performance requirements, the cylinder assembly in this embodiment is set as a split structure, and the main body of the structure consists of two parts, namely a first main structure and a second main structure, wherein the first main structure is made of copper alloy material or aluminum alloy material; the second main structure is made of stainless steel material or cast iron material.

[0014] Since the first main structure needs to be installed with a one-way valve inside and is provided with multiple fluid channels, it also needs to be connected to the shell; at the same time, in order to reduce the weight of the structure, the outer surface and internal shape of the first main structure are very irregular, and the amount of mechanical cutting processing is large; copper alloy or aluminum alloy has a low elastic modulus, and the use of copper alloy or aluminum alloy materials to manufacture the first main structure has obvious advantages: first, the blank is easy to form, such as copper forging is easy to achieve, and aluminum alloy die-casting is also easy to achieve; second, the formed component blank is easy to cut at high speed to achieve fine processing; third, the metal chips after mechanical processing of copper alloy and aluminum alloy are easy to recycle and reuse. Copper alloy is used to realize the first main structure of the liquid cylinder assembly. The strength of copper alloy material is sufficient to meet the structural pressure resistance requirements of more than 30MPa; the strength of aluminum alloy is sufficient to meet the structural pressure resistance requirements of more than 13MPa; and the low elastic modulus of copper alloy and aluminum alloy materials will not have a significant impact on the performance of the components. Therefore, the first main structure has a cost advantage of using copper alloy and aluminum alloy to manufacture according to the pressure resistance requirements.

[0015] The second main structure of the cylinder assembly only needs to be processed with a regularly shaped plunger cavity inside. In addition, for the convenience of connection, a circular hole or a threaded hole is locally processed for connection with the screws of the first main structure. Because the function of the second main structure is simple, the surfaces of the structure can be designed to be flat, such as a rectangular outer contour surface and a rectangular overall shape. Since the outer surface of the second main structure is flat and regular, its blank can be directly cut and formed from stainless steel sheets without casting or forging, and only a small amount of surface flattening is required. The maximum mechanical cutting work of the second main structure is realized by the plunger cavity hole, which can be achieved by using high-efficiency drilling methods such as U drilling. Since the processing workload of the second main structure is significantly reduced, the advantage of the low cost of raw materials of stainless steel materials is highlighted. In addition, in addition to the pressure resistance requirement, the second main structure also requires that the plunger cavity deforms less under high water pressure to avoid the gap between the plunger cavity and the plunger increasing under high pressure, resulting in increased flow loss; in order to reduce deformation, in addition to designing the second main structure to be thick enough, the elastic modulus of the material used also plays a crucial role, because the elastic modulus and deformation are in a positive proportional relationship, the elastic modulus of stainless steel is about 2 times that of copper alloy, and the same component is under the same pressure. The deformation of stainless steel components is about 1 / 2 of the deformation of copper alloy components. Therefore, the use of stainless steel can effectively reduce the deformation of the plunger cavity, reduce the flow loss of the water pump, and improve the volumetric efficiency. In addition, cast iron materials also have an elastic modulus close to that of stainless steel, but are cheap. Therefore, in situations where corrosion resistance requirements are lower, it is also feasible to use cast iron materials for the second main structure.

[0016] Therefore, the above-mentioned high-pressure water pump based on water or aqueous solution lubrication is configured as a split structure with respect to the setting of the liquid cylinder body assembly. The first main structure and the second main structure are respectively manufactured using different materials according to their own structural characteristics and performance requirements. Compared with the liquid cylinder body assembly in the prior art, the overall manufacturing cost is significantly reduced, and the performance of the pump is effectively improved.

[0017] Optionally, the communicating hole is coaxially arranged with the plunger cavity, and a sealing joint sleeve is nested at the connection between the plunger cavity and the communicating hole to achieve a sealed connection between the plunger cavity and the communicating hole.

[0018] Optionally, in the corresponding plunger cavity and the communicating hole, the diameter of the communicating hole is smaller than the diameter of the plunger cavity, and the end surface of the side wall of one end of the communicating hole facing the plunger cavity forms an annular table surface;

[0019] The sealing joint sleeve includes a first pipe section and a second pipe section connected in sequence, the outer wall diameter of the second pipe section is larger than the outer wall diameter of the first pipe section, the outer wall of the second pipe section is formed with an annular step surface facing the outer wall of the first pipe section, the first pipe section is nested in the connecting hole and matched with the connecting hole, the second pipe section is nested in the plunger cavity and matched with the plunger cavity, and the annular step surface is in contact with the annular table surface.

[0020] Optionally, the first pipe segment is interference fit with the connecting hole; an annular sealing groove surrounding the circumference of the second pipe segment is provided on the outer wall of the second pipe segment, a sealing ring is provided in the annular sealing groove, and the sealing ring is located between the second pipe segment and the plunger cavity to achieve sealing.

[0021] Optionally, along the extension direction of the axial centerline of the communicating hole, one end of the sealing joint sleeve away from the plunger cavity is flush with one end of the communicating hole away from the plunger cavity.

[0022] Optionally, a wear-resistant material sleeve is nested in the plunger cavity, and the wear-resistant material sleeve is attached to the inner wall of the plunger cavity.

[0023] Optionally, a cylinder liquid inlet hole is provided in the first main structure, one end of the liquid cylinder liquid inlet hole is directly connected to the first chamber and communicated with the liquid inlet port of the water suction valve, and the opening at the other end of the liquid cylinder liquid inlet hole is directly connected to the accommodating space.

[0024] Optionally, the driving assembly includes a driving mechanism and a rebound mechanism;

[0025] The driving mechanism comprises a main shaft, an eccentric structure arranged on the main shaft and corresponding to the plunger one by one, the axis of the main shaft is arranged perpendicular to the axis of the plunger cavity, a thrust structure is sleeved on the outer side of each eccentric structure, the thrust structure is rotatably connected with the eccentric structure so that the thrust structure and the eccentric structure form a sliding friction pair, and the eccentric structure and the thrust structure are both located in the housing;

[0026] The other end of the plunger is connected to the outer side of the thrust structure in rolling contact, and the rebound mechanism is used to provide the plunger with a rebound force along the extension direction of the axial centerline of the plunger cavity; when the eccentric structure rotates and the thrust structure pushes the plunger to move in the plunger cavity in a direction away from the eccentric structure, the plunger realizes pressurized discharge of water or aqueous solution; when the plunger moves toward the eccentric structure under the action of the rebound force of the rebound mechanism, the plunger cavity realizes the suction of water or aqueous solution.

[0027] Optionally, the rebound mechanism comprises: at least two spring assemblies and a bracket;

[0028] At least two of the spring assemblies are arranged on the peripheral side of the first main structure and are evenly distributed around the circumference of the axis of the plunger cavity. Each of the spring assemblies includes a spring seat and a spring. The spring seat is fixed to the first main structure. The axis of the spring is roughly parallel to the axis of the plunger cavity. One end of the spring is connected to the spring seat. The bracket is connected to an end of the plunger toward the eccentric structure, and the bracket is connected to an end of each spring away from the spring seat. Each spring is used to apply a rebound force to the bracket to drive the plunger to move in the direction of the eccentric structure.

[0029] Optionally, the first main structure and the second main structure are connected by screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0031] Figure 1 A schematic cross-sectional structure diagram of a high-pressure water pump based on water or aqueous solution lubrication provided in an embodiment of the utility model.

[0032] Icons: 1-first main structure; 2-second main structure; 3-housing; 4-plunger; 5-suction valve; 6-drain valve; 7-sealing joint sleeve; 8-driving mechanism; 9-rebound mechanism; 11-first chamber; 12-second chamber; 13-fluid channel; 14-liquid inlet hole of cylinder body; 15-connecting hole; 21-plunger cavity; 22-wear-resistant material sleeve; 31-water inlet of pump body; 81-main shaft; 82-eccentric structure; 83-thrust structure; 91-spring assembly; 92-bracket; 911-spring seat; 912-spring. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0034] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] refer to Figure 1 As shown, the utility model provides a high-pressure water pump based on water or aqueous solution lubrication, including: a liquid cylinder assembly, a shell 3, at least one plunger 4, and a drive assembly. Specifically, the liquid cylinder assembly includes a first main structure 1 and a second main structure 2 that are fixedly connected; wherein the first main structure 1 is made of copper alloy or aluminum alloy, and the second main structure 2 is made of stainless steel or cast iron. The shell 3 is fixedly connected to the first main structure 1, and a receiving space is formed in the first main structure 1 and the shell 3, and the second main structure 2 is located in the receiving space. A pump body water inlet 31 is provided on the shell 3, and the shell 3 is also used to fill water or aqueous solution. A plunger cavity 21 corresponding to and matching the plunger 4 is provided in the second main structure 2, and the plunger cavity 21 runs through the second main structure 2. In the extension direction of the axial centerline of the plunger cavity 21, the plunger cavity 21 has two opposite ports, which can be respectively referred to as the first port and the second port. The plunger 4 is coaxially arranged with the plunger cavity 21, one end of the plunger 4 extends into the plunger cavity 21 at the first port of the plunger cavity 21, the part of the plunger 4 extending into the plunger cavity 21 is slidably connected with the inner wall of the plunger cavity 21, and the other end of the plunger 4 is connected with the driving assembly in rolling contact. The driving assembly is also arranged in the housing 3, and is used to drive the plunger 4 to reciprocate in the plunger cavity 21. The first main structure 1 is provided with one-way valves corresponding to the plunger cavities 21 and arranged in pairs, and each pair of one-way valves includes a water suction valve 5 and a water discharge valve 6; one plunger 4 is slidably matched with one plunger cavity 21, and one plunger 4 corresponds to this one water suction valve 5 and water discharge valve 6 to achieve liquid distribution. For each corresponding pair of one-way valves and plunger cavity 21: the first main structure 1 is provided with a first chamber 11 for accommodating and installing a water suction valve 5, a second chamber 12 for accommodating and installing a water discharge valve 6, a fluid channel 13 connecting the first chamber 11 and the second chamber 12, and a connecting hole 15; one end of the fluid channel 13 is connected to the liquid outlet of the water suction valve 5, and the other end is connected to the liquid inlet of the water discharge valve 6; the plunger cavity 21 is connected to the fluid channel 13 through the connecting hole 15, and the fluid channel 13 is used for circulating high-pressure or low-pressure water flow when the plunger cavity 21 and the plunger 4 work together.

[0036] In the above-mentioned high-pressure water pump based on water or aqueous solution lubrication, the cylinder body assembly is connected to the shell 3, the plunger 4 and the driving assembly for driving the plunger 4 to reciprocate in the plunger chamber 21 are arranged in the shell 3, and a pump body water inlet 31 is arranged on the shell 3. The pump body water inlet 31 is the total water inlet of the pump body, and the shell 3 is used to fill water or aqueous solution. The water or aqueous solution can lubricate the components in the driving assembly, and can also dissipate heat and cool the components in the driving assembly, so that the driving components do not need to be lubricated with lubricating oil, avoid polluting the environment, and can also achieve a longer maintenance-free life. Among them, the liquid cylinder body assembly is the main pressure-bearing component in the water pump, and there are many channels for fluid circulation and chambers for setting components in the liquid cylinder body assembly. According to the processing requirements of different parts of the liquid cylinder body assembly, as well as the combined cost and performance requirements, the liquid cylinder body assembly in this embodiment is set to a split structure, and the main body of the liquid cylinder body structure consists of two parts, namely a first main structure 1 and a second main structure 2; wherein the material of the first main structure 1 is selected as copper alloy or aluminum alloy, and the material of the second main structure 2 is selected as stainless steel or cast iron.

[0037] The first main structure 1 is made of copper alloy or aluminum alloy. Since a one-way valve needs to be installed inside the first main structure 1 and multiple channels are provided, it is also necessary to achieve connection with the housing 3; at the same time, in order to reduce the weight of the structure, the outer surface and internal shape of the first main structure 1 are very irregular, and such a structure requires a large amount of mechanical cutting processing; although the elastic modulus of copper alloy or aluminum alloy is low, the advantages of using copper alloy or aluminum alloy materials to manufacture the first main structure 1 are obvious: first, blank forming, such as copper alloy forging or aluminum alloy die-casting, is easy to achieve; second, it is easy to achieve high-speed cutting and fine processing after blank forming; third, the metal chips after mechanical processing of copper alloy or aluminum alloy can be recycled. The first main structure 1 of the cylinder assembly is realized by using copper alloy or aluminum alloy. The strength of copper alloy is sufficient to meet the structural pressure resistance requirement of more than 30MPa, and aluminum alloy can meet the pressure resistance strength requirement of at least 13MPa; and the relatively low elastic modulus of copper alloy material and aluminum alloy material will not have a significant impact on the performance of the component, so the first main structure 1 is manufactured by using copper alloy or aluminum alloy, which has cost advantages.

[0038] The second main structure 2 is made of stainless steel or cast iron. The second main structure of the cylinder assembly only needs to process a regularly shaped plunger cavity inside. In addition, for the convenience of connection, a circular hole or a threaded hole is locally processed for connection with the screws of the first main structure; because the function of the second main structure is simple, the surfaces of the structure can be designed to be flat, such as a rectangular outer contour surface and a rectangular overall shape. Since the outer surface of the second main structure is flat and regular, its blank can be directly cut and formed by stainless steel sheet without casting or forging, and only a small amount of surface flattening is required, or it can be directly cast by cast iron and a small amount of surface flattening is required; the maximum mechanical cutting work of the second main structure is realized by the plunger cavity hole, which can be achieved by high-efficiency drilling methods such as U drilling. Since the processing workload of the second main structure is significantly reduced, the advantage of low cost of stainless steel or cast iron raw materials is highlighted. In addition, in addition to the pressure resistance requirement, the second main structure also requires that the plunger cavity has little deformation when subjected to high water pressure, so as to avoid the gap between the plunger cavity and the plunger increasing under high pressure, resulting in increased flow loss; in order to reduce deformation, in addition to designing the second main structure to be thick enough, the elastic modulus of the material used also plays a crucial role, because the elastic modulus and deformation are in direct proportion, the elastic modulus of stainless steel is about twice that of copper alloy, and the deformation of stainless steel components under the same pressure is about 1 / 2 of that of copper alloy components, and the elastic modulus of cast iron is similar to that of stainless steel. Therefore, the use of stainless steel or cast iron can effectively reduce the deformation of the plunger cavity, reduce the flow loss of the water pump, and improve the volumetric efficiency.

[0039] Therefore, the above-mentioned high-pressure water pump based on water or aqueous solution lubrication sets the liquid cylinder body as a split structure, and the first main structure 1 and the second main structure 2 are made of different materials according to their own structural characteristics and performance requirements. Compared with the integral liquid cylinder body in the prior art, the manufacturing cost is significantly reduced and the high performance indicators of the pump are guaranteed.

[0040] It should be noted that, in this embodiment, the first main structure and the second main structure are the two main structures constituting the pump head. The first main structure is a continuous structure made of the same material as a whole, and the second main structure is also a continuous structure made of the same material as a whole. Some chambers, channels, etc. formed in the first main structure, valves, attached pipes, etc. arranged in the chambers or channels, etc., and some plating, coatings, spray paints, etc. on the surface of the first main structure, and the connectors connecting the first main structure and the second main structure do not affect the material definition of the first main structure. The accessories or coatings that are independent components on the first main structure do not belong to the structure of the first main structure itself, so they will not affect the selection and limitation of the material of the first main structure itself. Similarly, the material definition of the second main structure itself does not include the materials of some accessories or coatings that are independent components on the second main structure.

[0041] In this embodiment, specifically, the second main structure 2 can be connected to one side of the first main structure 1, and can be fixedly connected by screws. The port at one end of the plunger cavity 21 in the second main structure 2 faces the first main structure 1, and the connecting hole 15 on the first main structure 1 is coaxially arranged with the plunger cavity 21. A sealing joint sleeve 7 is nested at the connection between the plunger cavity 21 and the connecting hole 15, a part of the sealing structure sleeve is located in the plunger cavity 21, and a part is located in the connecting hole 15, so as to realize the connection seal between the plunger cavity 21 and the connecting hole 15, ensure the sealing between the plunger cavity 21 and the connecting hole 15, and help to ensure the good performance of the water pump.

[0042] Furthermore, in the corresponding plunger cavity 21 and the connecting hole 15, the diameter of the connecting hole 15 is smaller than the diameter of the plunger cavity 21. The side wall end face of the connecting hole 15 facing the plunger cavity 21 forms an annular table, and the annular table faces the inside of the plunger cavity 21. The sealing joint sleeve 7 includes a first pipe section and a second pipe section connected in sequence, wherein the outer wall diameter of the second pipe section is larger than the outer wall diameter of the first pipe section, and the outer wall of the second pipe section is formed with an annular step surface facing the outer wall of the first pipe section; the first pipe section is nested in the connecting hole 15 and adapted to the connecting hole 15, the second pipe section is nested in the plunger cavity 21 and adapted to the plunger cavity 21, the annular step surface contacts and cooperates with the annular table surface, and the annular step surface rests on the annular table surface. When the plunger 4 is pressurized to drain water in the plunger cavity 21, it can effectively ensure that the sealing joint sleeve 7 will not be impacted by the pressurized water flow and slip, thereby improving the stability of the sealing joint sleeve 7 at the connection between the connecting hole 15 and the plunger cavity 21.

[0043] In order to further increase the sealing performance of the sealing joint sleeve 7, an interference fit is set between the first pipe section and the connecting hole 15, and an annular sealing groove circumferentially surrounding the axis of the second pipe section is provided on the outer wall of the second pipe section; a sealing ring is provided in the annular sealing groove, and the sealing ring is located between the second pipe section and the plunger cavity 21 to achieve sealing. The sealing ring can be an O-ring with a certain elasticity, which is squeezed between the second pipe section and the plunger cavity 21 to better achieve sealing, which is beneficial to improving the performance of the water pump.

[0044] In a possible implementation, along the extension direction of the axial centerline of the connecting hole 15, one end of the sealing joint sleeve 7 away from the plunger cavity 21 is flush with the other end of the connecting hole 15 away from the plunger cavity 21, and the sealing joint sleeve 7 can completely cover the inner wall of the connecting hole 15, that is, the portion of the sealing joint sleeve 7 corresponding to the connecting hole 15 is the same as the length of the connecting hole 15, and all the water flowing in the connecting hole 15 passes through the inner hole of the sealing joint sleeve 7 and then communicates with the plunger cavity 21, thereby further improving the sealing performance.

[0045] In a possible implementation, in order to avoid wear between the plunger 4 and the plunger cavity 21, a wear-resistant material sleeve 22 is nested in the plunger cavity 21. The wear-resistant material sleeve 22 is attached to the inner wall of the plunger cavity 21, and the plunger 4 and the inner hole of the wear-resistant material sleeve 22 are slidably matched. The wear-resistant material sleeve 22 is made of wear-resistant material and is not easily worn when matched with the plunger 4, which is beneficial to ensuring the performance of the water pump.

[0046] In addition, when the plunger cavity 21 is coaxially arranged with the connecting hole 15 and the diameter of the plunger cavity 21 is larger than the diameter of the connecting hole 15, a wear-resistant material sleeve 22 is arranged in the plunger cavity 21, and one end of the wear-resistant material sleeve 22 facing the connecting hole 15 is against the annular table surface. When the water in the plunger cavity 21 is pressurized and discharged, the wear-resistant material sleeve 22 will not be impacted and squeezed out of the plunger cavity 21, so that the wear-resistant material sleeve 22 is firmly installed in the plunger cavity 21.

[0047] In a specific implementation, a liquid cylinder body liquid inlet hole 14 is further provided in the first main structure, one end of the liquid cylinder body liquid inlet hole 14 is directly connected to the first chamber 11, and the opening of the other end of the liquid cylinder body liquid inlet hole 14 is directly connected to the accommodating space of the shell 3. Other water inlet channels can be omitted in the first main structure 1 for connection, and the water or aqueous solution in the shell 3 can directly enter the water suction valve through the liquid cylinder body liquid inlet hole 14, which can simplify the structural setting of the first main structure 1, and is conducive to further reducing the overall weight and size of the liquid cylinder assembly.

[0048] In a possible embodiment, the driving assembly includes a driving mechanism 8 and a rebound mechanism 9; illustratively, the driving mechanism 8 includes a main shaft 81, an eccentric structure 82 arranged on the main shaft 81 and corresponding to the plunger 4 one by one, the axis of the main shaft 81 is arranged perpendicular to the axis of the plunger cavity 21, and a thrust structure 83 is sleeved on the outer side of each eccentric structure 82, and the thrust structure 83 is rotatably connected with the eccentric structure 82, and the thrust structure 83 and the eccentric structure 82 form a sliding friction pair. The eccentric structure 82 and the thrust structure are both located in the housing 3, wherein the main shaft 81 is connected to a power assembly outside the housing 3, and the power assembly is used to provide rotational power to the main shaft 81, and the power assembly can be a motor. Preferably, the eccentric structure 82 can be an eccentric wheel, and the thrust structure 83 can be a thrust ring arranged on the outer periphery of the eccentric wheel, and the thrust ring is rotatably connected with the eccentric wheel, and the axis of relative rotation between the thrust ring and the eccentric wheel is parallel to the axis of the main shaft 81. One end of the plunger 4 extends into the plunger cavity 21, and the other end of the plunger 4 is connected to the outer side of the thrust structure 83 by rolling contact. The rotation of the main shaft 81 drives the eccentric structure 82 to rotate, so that the thrust structure 83 can roll on the contact surface with the plunger and apply thrust to the plunger 4, so that the plunger 4 can move toward the plunger cavity 21; in the process of the plunger moving toward the plunger cavity, the rebound mechanism is in a force storage state, and the rebound mechanism 9 is used to provide the plunger 4 with a rebound force along the axis of the plunger cavity 21, so that the plunger 4 is reset. When the eccentric structure 82 rotates, and the thrust structure 83 pushes the plunger 4 to move in the plunger cavity 21 in a direction away from the eccentric structure 82, the plunger 4 realizes pressurized discharge of water or aqueous solution; when the plunger 4 moves toward the eccentric structure 82 under the action of the rebound force of the rebound mechanism 9, the plunger cavity 21 realizes the suction of water or aqueous solution.

[0049] Specifically, the rebound mechanism 9 includes: at least two spring assemblies 91 and a bracket 92; at least two spring assemblies 91 are arranged on the peripheral side of the first main structure 1 and are evenly distributed around the circumference of the axis of the plunger cavity 21; each spring assembly 91 includes a spring seat 911 and a spring 912, the spring seat 911 is fixed to the first main structure 1, the axis of the spring 912 is roughly parallel to the axis of the plunger cavity 21, one end of the spring 912 is connected to the spring seat 911, the bracket 92 is connected to the end of the plunger 4 facing the eccentric structure 82, and the bracket 92 is connected to the end of each spring 912 away from the spring seat 911, and each spring 912 is used to apply a rebound force to the bracket 92 to drive the plunger 4 to move in the direction of the eccentric structure 82.

[0050] On the basis of the structural setting of the above-mentioned drive assembly, when the plunger 4 pressurizes the water, the thrust ring pushes the plunger 4 to move away from the main shaft 81. As the water pressure in the plunger cavity 21 increases, the water intake valve 5 is closed, the water discharge valve 6 is opened, and the water in the plunger cavity 21 flows out of the first main structure through the sealing joint sleeve 7, the fluid channel 13 connected to the water discharge valve 6, and the water discharge valve 6; at this time, the spring is compressed and is in a power storage state, which is used to provide a rebound force when the plunger returns. When the plunger 4 returns, the plunger 4 is driven to move toward the main shaft 81 in the extension direction of its axis under the action of the rebound force of the spring 912, the pressure in the plunger cavity 21 decreases, the water discharge valve 6 is closed, the water intake valve 5 is opened, and the water or aqueous solution in the housing 3 flows into the plunger cavity 21 through the water intake valve 5, the fluid channel 13 connected to the water intake valve 5, and the sealing joint sleeve 7.

[0051] It should be noted that the plunger 4 in this embodiment can also be provided with two, three or other numbers, as long as the plunger 4 and the plunger cavity 21 are provided one-to-one, and a pair of one-way valves and a connecting channel of the one-way valve are provided corresponding to each plunger cavity 21. In addition, the eccentric structure 82 and the rebound mechanism 9 are also provided corresponding to each plunger 4, so that each plunger 4 can achieve pressurization and water absorption in the plunger cavity 21.

[0052] In a possible implementation, in order to pursue better economy, if the first main structure is used under lower pressure conditions, it can be made of aluminum alloy material, which can meet the compressive strength requirement of at least 13 MPa; in addition to having the same easy-to-form processing characteristics as copper alloy materials, aluminum alloy materials are cheaper.

[0053] In a possible implementation, in order to pursue better economy, the second main structure can be made of cast iron. Although cast iron material has inferior corrosion resistance to stainless steel material, it has elastic modulus close to that of stainless steel material, and the material cost is significantly lower.

[0054] For example, in a specific embodiment, in order to pursue better economy, the first main structure is made of aluminum alloy material, and the second main structure is made of cast iron material.

[0055] In a possible implementation, in order to pursue higher performance requirements for the pump body, such as when the first main structure is used under relatively high pressure conditions, it can be made of copper alloy material. The copper alloy material can meet the compressive strength requirement of 30MPa. In addition to having easy forming and processing characteristics, it can also meet higher compressive strength requirements.

[0056] In a possible implementation, in order to meet higher performance requirements of the pump body, the second main structure can be made of stainless steel. Stainless steel material not only has a high elastic modulus but also has relatively good corrosion resistance, which can ensure better performance requirements of the pump body and help extend the service life of the pump body.

[0057] Exemplarily, in a specific implementation, the first main structure is made of a copper alloy material, and the second main structure is made of a stainless steel material.

[0058] Among them, for actual needs, the materials for the first main structure and the second main structure can be selected according to performance preferences. For example, the first main structure can be made of copper alloy material, and the second main structure can be made of cast iron material, or the first main structure can be made of aluminum alloy material, and the second main structure can be made of stainless steel material.

[0059] In a possible implementation, in order to improve the anti-corrosion performance or make the product more beautiful, a coating, such as painting, electroplating, etc., can be added to the surface of the first main structure 1 and the second main structure 2. The main material for manufacturing the first main structure is still copper alloy or aluminum alloy, and the main material for manufacturing the first main structure is still stainless steel or cast iron.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure water pump based on water or aqueous solution lubrication, characterized in that: include: A cylinder assembly, a housing, at least one plunger, and a drive assembly; The liquid cylinder assembly comprises a first main body structure and a second main body structure which are fixedly connected, the housing is fixedly connected to the first main body structure, and a receiving space is formed inside the housing, the second main body structure is located in the receiving space, and the receiving space is used to be filled with water or an aqueous solution; The second main body structure is provided with a plunger cavity corresponding to and cooperating with the plunger one by one, the plunger cavity passes through the second main body structure, one end of the plunger extends into the plunger cavity, and the other end is connected to the drive assembly, the drive assembly is located in the housing, and is used to drive the plunger to reciprocate in the plunger cavity; The first main structure is provided with one-way valves corresponding to the plunger cavities and arranged in pairs, each pair of one-way valves includes a water suction valve and a water discharge valve; for each pair of one-way valves and plunger cavities corresponding to each other, the first main structure is provided with a first chamber for accommodating and installing the water suction valve, a second chamber for accommodating and installing the water discharge valve, a fluid channel connecting the first chamber and the second chamber, and a connecting hole; one end of the fluid channel is connected to the liquid outlet of the water suction valve, and the other end is connected to the liquid inlet of the water discharge valve; the plunger cavity is connected to the fluid channel through the connecting hole; Wherein, the first main body structure is manufactured from copper alloy material or aluminum alloy material; the second main body structure is manufactured from stainless steel material or cast iron material.

2. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: The communicating hole is coaxially arranged with the plunger cavity, and a sealing joint sleeve is embedded in the connection between the plunger cavity and the communicating hole to achieve sealing connection between the plunger cavity and the communicating hole.

3. The high-pressure water pump based on water or aqueous solution lubrication according to claim 2, characterized in that: In the plunger cavity and the communicating hole corresponding to each other, the diameter of the communicating hole is smaller than the diameter of the plunger cavity; The sealing joint sleeve includes a first pipe section and a second pipe section connected in sequence, the outer wall diameter of the second pipe section is larger than the outer wall diameter of the first pipe section, the outer wall of the second pipe section forms an annular step surface toward the outer wall of the first pipe section, the first pipe section is nested in the connecting hole and adapted to the connecting hole, and the second pipe section is nested in the plunger cavity and adapted to the plunger cavity.

4. The high-pressure water pump based on water or aqueous solution lubrication according to claim 3, characterized in that: The first pipe section is interference fit with the connecting hole; an annular sealing groove surrounding the circumference of the second pipe section is provided on the outer wall of the second pipe section, a sealing ring is provided in the annular sealing groove, and the sealing ring is located between the second pipe section and the plunger cavity to achieve sealing.

5. The high-pressure water pump based on water or aqueous solution lubrication according to any one of claims 1 to 4, characterized in that: A wear-resistant material sleeve is nested in the plunger cavity, and the wear-resistant material sleeve is attached to the inner wall of the plunger cavity.

6. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: A liquid cylinder body liquid inlet hole is provided in the first main structure, one end of the liquid cylinder body liquid inlet hole is directly connected to the first chamber and communicated with the liquid inlet port of the water suction valve, and the opening of the other end of the liquid cylinder body liquid inlet hole is directly connected to the accommodating space.

7. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: The driving assembly comprises a driving mechanism and a rebound mechanism; The driving mechanism comprises a main shaft, an eccentric structure arranged on the main shaft and corresponding to the plunger one by one, the axis of the main shaft is arranged perpendicular to the axis of the plunger cavity, a thrust structure is sleeved on the outer side of each eccentric structure, the thrust structure is rotatably connected with the eccentric structure so that the thrust structure and the eccentric structure form a sliding friction pair, and the eccentric structure and the thrust structure are both located in the housing; The other end of the plunger is connected to the outer side of the thrust structure in rolling contact, and the rebound mechanism is used to provide the plunger with a rebound force along the extension direction of the axial centerline of the plunger cavity; When the eccentric structure rotates and the thrust structure pushes the plunger to move in the plunger cavity in a direction away from the eccentric structure, the plunger discharges the water or aqueous solution under pressure; When the plunger moves toward the eccentric structure under the action of the rebound force of the rebound mechanism, water or aqueous solution is sucked into the plunger cavity.

8. The high-pressure water pump based on water or aqueous solution lubrication according to claim 7, characterized in that: The rebound mechanism comprises: at least two spring assemblies and a bracket; At least two of the spring assemblies are arranged on the peripheral side of the first main structure and are evenly distributed around the circumference of the axis of the plunger cavity; each of the spring assemblies includes a spring seat and a spring, the spring seat is fixed to the first main structure, the axis of the spring is roughly parallel to the axis of the plunger cavity, and one end of the spring is connected to the spring seat; the bracket is connected to an end of the plunger facing the eccentric structure, and the bracket is connected to an end of each of the springs away from the spring seat, and each of the springs is used to apply a rebound force to the bracket to drive the plunger to move in the direction of the eccentric structure.

9. The high-pressure water pump based on water or aqueous solution lubrication according to claim 1, characterized in that: The first main body structure is connected to the second main body structure by screws.

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